Resist composition, method for producing resist pattern, salt, acid generator, and resin

Abstract

To provide a salt, an acid generator, a resin, and a resist composition which allow a resist pattern having good CD uniformity to be produced.SOLUTION: There are provided: an acid generator containing a salt represented by formula (I1) or formula (I2) or a structural unit derived from formula (I1) or formula (I2); a resin; and a resist composition. [In the formulae, Q1, Q2, R1 and R2 each independently represent an H atom, an F atom, a perfluoroalkyl group or an alkyl group; X1 represents *-CO-O-, *-O-CO-, *-O-CO-O- or *-O-; L1 represents a single bond or a substituted / unsubstituted aliphatic hydrocarbon group; R3 and R4 each represent a halogen atom other than an I atom, a haloalkyl group or the like; and R5 represents an H atom, a halogen atom or an alkyl group which may have a halogen atom.]SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a salt for an acid generator used in semiconductor microfabrication, an acid generator containing the salt, a resin, a resist composition, and a method for manufacturing a resist pattern.

Background Art

[0002] Patent Document 1 describes a resin containing a structural unit derived from a salt represented by the following formula and a resist composition containing the resin. TIFF2025113197000001.tif2964

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The present invention provides a salt capable of manufacturing a resist pattern with better CD uniformity (CDU) than a resist pattern formed from the above - mentioned resist composition.

Means for Solving the Problems

[0005] The present invention includes the following inventions. [1] An acid generator containing a salt represented by formula (I1) or formula (I2) or a structural unit represented by formula (IP1) or formula (IP2). TIFF2025113197000002.tif87158[In formula (I1), formula (I2), formula (IP1), and formula (IP2), Q 1 、Q 2 、R 1 and R 2Each independently represents a hydrogen atom, a fluorine atom, a perfluoroalkyl group having 1 to 6 carbon atoms, or an alkyl group having 1 to 6 carbon atoms. z represents an integer from 0 to 6. When z is 2 or more, a plurality of Rs 1 and Rs 2 may be the same as or different from each other. X 1 is *-CO-O-, *-O-CO-, *-O-CO-O-, or *-O- (where * represents a bond with C(R 1 )(R 2 ), or C(Q 1 )(Q 2 ).) represents a bonding site with. L 1 represents a single bond or an aliphatic hydrocarbon group having 1 to 28 carbon atoms which may have a substituent, and -CH2- contained in the aliphatic hydrocarbon group may be replaced by -O-, -S-, -CO-, -SO-, -NR 7 -, or -SO2-. R 7 represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms. R 3 and R 4 each independently represent a halogen atom other than an iodine atom, a haloalkyl group having 1 to 12 carbon atoms, or a hydrocarbon group having 1 to 18 carbon atoms. The hydrocarbon group may have a substituent, and -CH2- contained in the haloalkyl group and the hydrocarbon group may be replaced by -O-, -CO-, -S-, -SO-, -NR 7 -, or -SO2-. m3 represents an integer from 1 to 3. When m3 is 2 or more, a plurality of Rs 3 may be the same as or different from each other. m4 represents an integer from 0 to 3. When m4 is 2 or more, a plurality of Rs 4 may be the same as or different from each other. m5 represents an integer from 1 to 3. m6 represents an integer from 1 to 4. R 5 represents a hydrogen atom, a halogen atom, or an alkyl group having 1 to 6 carbon atoms which may have a halogen atom. ZI + represents an organic cation.] [2]R 3 and R 4 are as defined in [1] for the acid generator, where R is a fluorine atom, a hydroxy group, an alkoxy group having 1 to 3 carbon atoms, or a perfluoroalkyl group having 1 to 3 carbon atoms. [3]X 1 is as defined in [1] or [2] for the acid generator, where X is *-CO-O- or *-O-CO-O-. [4]L 1 is as defined in any one of [1] to [3] for the acid generator, where L is a single bond or a linear alkanediyl group having 1 to 6 carbon atoms. [5]m3 is 1 and m4 is 0 as defined in any one of [1] to [4] for the acid generator. [6]m5 is 1 and m6 is 2 as defined in any one of [1] to [5] for the acid generator. [7]A resist composition containing the acid generator as defined in any one of [1] to [6]. [8]The acid generator is a salt represented by formula (I), and the resist composition according to [7] further contains a resin containing a structural unit (a1) having an acid-labile group. [9]The acid generator is a resin containing a structural unit represented by formula (IP), and the resin further contains a structural unit (a1) having an acid-labile group, as described in [7] for the resist composition.

[10] The resist composition according to [9] further contains a salt represented by formula (I).

[11] The resist composition according to any one of [8] to

[10] , wherein the structural unit (a1) having an acid-labile group includes at least one selected from the group consisting of a structural unit represented by formula (a1-0), a structural unit represented by formula (a1-1), a structural unit represented by formula (a1-2), a structural unit represented by formula (a1-4), a structural unit represented by formula (a1-5), and a structural unit represented by formula (a1-6). TIFF2025113197000003.tif47153[In formula (a1-0), formula (a1-1), and formula (a1-2), L a01 L a1 and L a2Each independently represents -O- or *-O-(CH2) k1 -CO-O-, k1 represents an integer from 1 to 7, and * represents the bonding site with -CO-. R a01 R a4 and R a5 each independently represents a hydrogen atom, a halogen atom, or an alkyl group having 1 to 6 carbon atoms which may have a halogen atom. R a02 R a03 and R a04 each independently represents an alkyl group having 1 to 8 carbon atoms, an alicyclic hydrocarbon group having 3 to 18 carbon atoms, an aromatic hydrocarbon group having 6 to 18 carbon atoms, or a group formed by combining these, and the alkyl group, the alicyclic hydrocarbon group, and the aromatic hydrocarbon group may have a halogen atom. R a6 and R a7 each independently represents an alkyl group having 1 to 8 carbon atoms, an alkenyl group having 2 to 8 carbon atoms, an alicyclic hydrocarbon group having 3 to 18 carbon atoms, an aromatic hydrocarbon group having 6 to 18 carbon atoms, or a group formed by combining these, and the alkyl group, the alkenyl group, the alicyclic hydrocarbon group, and the aromatic hydrocarbon group may have a halogen atom. m1 represents an integer from 0 to 14. n1 represents an integer from 0 to 10. n1’ represents an integer from 0 to 3.] TIFF2025113197000004.tif31118[In formula (a1-4), R a1 represents a hydrogen atom, a halogen atom, or an alkyl group having 1 to 6 carbon atoms which may have a halogen atom. R a17 represents a halogen atom, a hydroxy group, a carboxy group, an alkyl group having 1 to 6 carbon atoms which may have a halogen atom, an alkoxy group having 1 to 6 carbon atoms, an alkoxyalkyl group having 2 to 12 carbon atoms, an alkoxyalkoxy group having 2 to 12 carbon atoms, an alkylcarbonyl group having 2 to 4 carbon atoms, an alkylcarbonyloxy group having 2 to 4 carbon atoms, an acryloyloxy group, or a methacryloyloxy group. Aa11 represents a single bond or an alkanediyl group having 1 to 12 carbon atoms, and -CH2- contained in the alkanediyl group may be replaced by -O-, -CO- or -NR a18 -. R a18 represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms. X a1 represents a single bond or a carbonyl group. R a34 and R a35 each independently represent a hydrogen atom or a hydrocarbon group having 1 to 12 carbon atoms, R a36 represents a hydrocarbon group having 1 to 20 carbon atoms, or R a35 and R a36 are bonded to each other to form a divalent hydrocarbon group having 2 to 20 carbon atoms together with the -C-O- to which they are bonded, and -CH2- contained in the hydrocarbon group and the divalent hydrocarbon group may be replaced by -O- or -S-. na1 represents any integer from 1 to 5. When na1 is 2 or more, the groups in the plurality of parentheses may be the same as or different from each other. na11 represents any integer from 0 to 4. When na11 is 2 or more, the plurality of R a17 may be the same as or different from each other. mc represents any integer from 0 to 2.] TIFF2025113197000005.tif4558[In formula (a1-5), R a8 represents an alkyl group having 1 to 6 carbon atoms which may have a halogen atom, a hydrogen atom or a halogen atom. Z a1 represents a single bond or *-(CH2) h3 -CO-L 54 -, h3 represents any integer from 1 to 4, and * represents the bonding site with L 51 . L 51 、L 52 、L 53 and L 54 each independently represent -O- or -S-. s1 represents any integer from 1 to 3. s1’ represents an integer of any one of 0 to 3. TIFF2025113197000006.tif3580 [In formula (a1-6), R a61 represents a hydrogen atom, a halogen atom, or an alkyl group having 1 to 6 carbon atoms which may have a halogen atom. R a62 and R a63 and R a64 each independently represent an alkyl group having 1 to 6 carbon atoms or a cyclic hydrocarbon group having 3 to 18 carbon atoms which may have a substituent, or R a62 and R a63 are bonded to each other to form a ring having 3 to 20 carbon atoms together with the carbon atom to which they are bonded. X a61 represents a single bond, -CO-O-*, or -CO-NR a65 -*, where * represents the bonding site to Ar, and R a65 represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms. X a62 represents a single bond, *-O-L a61 -, or *-CO-O-L a62 -, where * represents the bonding site to Ar, and L a61 and L a62 each independently represent an alkanediyl group having 1 to 4 carbon atoms. Ar represents an aromatic hydrocarbon group having 6 to 20 carbon atoms which may have a substituent. The resist composition according to any one of [8] to

[11] , wherein the resin containing the structural unit (a1) having an acid-labile group further contains a structural unit represented by formula (a2-A). TIFF2025113197000007.tif30128 [In formula (a2-A), R a2 represents a hydrogen atom, a halogen atom, or an alkyl group having 1 to 6 carbon atoms which may have a halogen atom. R a27represents a halogen atom, a hydroxy group, a carboxy group, an alkyl group having 1 to 6 carbon atoms which may have a halogen atom, an alkoxy group having 1 to 6 carbon atoms, an alkoxyalkyl group having 2 to 12 carbon atoms, an alkoxyalkoxy group having 2 to 12 carbon atoms, an alkylcarbonyl group having 2 to 4 carbon atoms, an alkylcarbonyloxy group having 2 to 4 carbon atoms, an acryloyloxy group or a methacryloyloxy group. A a21 represents a single bond or an alkanediyl group having 1 to 12 carbon atoms, and -CH2- contained in the alkanediyl group may be replaced by -O-, -CO- or -NR a28 -. R a28 represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms. X a2 represents a single bond or a carbonyl group. nA2 represents any integer from 1 to 5, and when nA2 is 2 or more, the groups in the plurality of parentheses may be the same as or different from each other. na21 represents any integer from 0 to 4, and when na21 is 2 or more, the plurality of R a27 may be the same as or different from each other. mc represents any integer from 0 to 2. The resist composition according to any one of [7] to

[12] , further containing a salt that generates an acid having a lower acidity than the acid generated from the

[13] acid generator.

[14] (1) A step of applying the resist composition according to any one of [7] to

[13] onto a substrate, (2) A step of drying the applied resist composition to form a composition layer, (3) A step of exposing the composition layer, (4) A step of heating the exposed composition layer, and (5) A step of developing the heated composition layer, A method for producing a resist pattern including the above steps.

[15] The salt represented by the above formula (I1) or formula (I2).

[16] R 3 and R 4is a salt as described in

[15] , which is a fluorine atom, a hydroxy group, an alkoxy group having 1 to 3 carbon atoms, or a perfluoroalkyl group having 1 to 3 carbon atoms.

[17] X 1 is a salt as described in

[15] or

[16] , which is *-CO-O- or *-O-CO-O-.

[18] L 1 is a salt as described in any one of

[15] to

[17] , which is a single bond or a linear alkanediyl group having 1 to 6 carbon atoms.

[19] m3 is 1 and m4 is 0, which is a salt as described in any one of

[15] to

[18] .

[20] m5 is 1 and m6 is 2, which is a salt as described in any one of

[15] to

[19] .

[21] A resin containing a structural unit represented by the above formula (IP1) or formula (IP2).

Advantages of the Invention

[0006] By using the resist composition containing the salt of the present invention, a resist pattern can be produced with good CD uniformity (CDU).

Modes for Carrying Out the Invention

[0007] In this specification, the term “(meth)acrylic monomer” means “at least one of acrylic monomers and methacrylic monomers”. Expressions such as “(meth)acrylate” and “(meth)acrylic acid” also represent the same meaning. Among the groups described in this specification, those that can take both a linear structure and a branched structure may be either of them. For -CH2- contained in a hydrocarbon group or the like, it is -O-, -S-, -CO-, -SO-, -NR X- When replaced by -(X is any symbol) or -SO2-, the same examples apply to each group, and the number of carbon atoms before replacement is taken as the number of carbon atoms in the hydrocarbon group or the like. The "combined group" means a group formed by combining two or more of the exemplified groups, and the valences of these groups may be appropriately changed depending on the bonding form. "Derived from" or "derived" means that the polymerizable C=C bond contained in the molecule becomes a -C-C- group (single bond) by polymerization. When stereoisomers exist, all stereoisomers are included. Each group may have any position and number of hydrogen atoms contained in the group replaced by a bond depending on the number of substituents and the like. The number of carbon atoms in the substituent is not included in the number of carbon atoms of the group being substituted. In the present specification, the "acid-labile group" means a group having a leaving group, which forms a hydrophilic group (for example, a hydroxy group or a carboxy group, etc.) when the leaving group is eliminated upon contact with an acid (for example, trifluoromethanesulfonic acid, etc.). The "base-labile group" means a group having a leaving group, which forms a hydrophilic group (for example, a carboxy group or a hydroxy group, etc.) when the leaving group is eliminated upon contact with a base (for example, trimethylamine, tetramethylammonium hydroxide, etc.). In the present specification, the "solid content of the resist composition" means the total of the components excluding the solvent (E) described later from the total amount of the resist composition.

[0008] [Salts represented by formula (I1) and formula (I2)] The present invention relates to a salt represented by formula (I1) (hereinafter sometimes referred to as "salt (I1)") and a salt represented by formula (I2) (hereinafter sometimes referred to as "salt (I2)"). The combination of salt (I1) and salt (I2) may be referred to as salt (I). Among salts (I), the side having a negative charge may be referred to as "anion (I)", and the side having a positive charge may be referred to as "cation (I)". TIFF2025113197000008.tif42150[Wherein, all symbols have the same meanings as described above respectively.]

[0009] [Anion (I)] In formula (I), Q 1 , Q2 , R 1 and R 2 Examples of the perfluoroalkyl group of R and R include a trifluoromethyl group, a perfluoroethyl group, a perfluoropropyl group, a perfluoroisopropyl group, a perfluorobutyl group, a perfluoro sec-butyl group, a perfluoro tert-butyl group, a perfluoropentyl group, a perfluorohexyl group, and the like. The number of carbon atoms of the perfluoroalkyl group is preferably 1 to 4, more preferably 1 to 3. Q 1 , Q 2 , R 1 and R 2 Examples of the alkyl group of Q, Q, R and R include a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, a sec-butyl group, a tert-butyl group, a pentyl group, a hexyl group and the like. The number of carbon atoms of the alkyl group is preferably 1 to 4, more preferably 1 to 3. Q 1 and Q 2 Preferably, at least one of Q and Q contains a fluorine atom or a perfluoroalkyl group, more preferably at least one of them is a fluorine atom or a perfluoroalkyl group, still more preferably each is independently a trifluoromethyl group or a fluorine atom, and even more preferably both are fluorine atoms. R 1 and R 2 Each of R and R is independently preferably a hydrogen atom, a fluorine atom, a methyl group or a trifluoromethyl group, more preferably a hydrogen atom or a fluorine atom, and still more preferably a hydrogen atom. z is preferably any integer from 0 to 4, more preferably any integer from 0 to 3, still more preferably any integer from 0 to 2, and even more preferably 0 or 1. X 1 is preferably *-CO-O- or *-O-CO-O-, more preferably *-CO-O- (* represents the bonding site with C(R 1 )(R 2 ) or C(Q 1 )(Q 2 ).).

[0010] L 1 Examples of the aliphatic hydrocarbon group in include linear or branched chain hydrocarbon groups such as alkanediyl groups, and monocyclic or polycyclic (including spiro rings, condensed rings, bridged rings, etc.) alicyclic hydrocarbon groups. A group formed by combining two or more of these groups (for example, a divalent hydrocarbon group formed from an alicyclic hydrocarbon group and a chain hydrocarbon group) may also be used. The number of carbon atoms in the aliphatic hydrocarbon group is preferably 1 to 26, more preferably 1 to 24, still more preferably 1 to 20, even more preferably 1 to 18. Examples of the alkanediyl group include linear alkanediyl groups such as methylene group, ethylene group, propane-1,3-diyl group, butane-1,4-diyl group, pentane-1,5-diyl group, hexane-1,6-diyl group, heptane-1,7-diyl group, octane-1,8-diyl group, nonane-1,9-diyl group, decane-1,10-diyl group, undecane-1,11-diyl group, dodecane-1,12-diyl group, tridecane-1,13-diyl group, tetradecane-1,14-diyl group, pentadecane-1,15-diyl group, hexadecane-1,16-diyl group and heptadecane-1,17-diyl group, and branched alkanediyl groups such as ethane-1,1-diyl group, propane-1,1-diyl group, propane-1,2-diyl group, propane-2,2-diyl group, pentane-2,4-diyl group, 2-methylpropane-1,3-diyl group, 2-methylpropane-1,2-diyl group, pentane-1,4-diyl group, 2-methylbutane-1,4-diyl group. The terminal of the branched alkanediyl group may be an alkyl group such as a methyl group. The number of carbon atoms in the chain hydrocarbon group may be 1 to 18, preferably 1 to 12, more preferably 1 to 10, still more preferably 1 to 9, even more preferably 1 to 8, still even more preferably 1 to 6, and even more preferably 1 to 4. Examples of the monocyclic or polycyclic divalent alicyclic hydrocarbon group include the following alicyclic hydrocarbon groups, etc. The bonding site can be at any position. JPEG2025113197000009.jpg47169Specifically, it is a monocyclic divalent alicyclic hydrocarbon group which is a monocyclic cycloalkanediyl group such as a cyclobutane-1,3-diyl group, a cyclopentane-1,3-diyl group, a cyclohexane-1,4-diyl group, a cyclooctane-1,5-diyl group, etc. A polycyclic divalent alicyclic hydrocarbon group which is a polycyclic cycloalkanediyl group such as a norbornane-1,4-diyl group, a norbornane-2,5-diyl group, an adamantane-1,5-diyl group, an adamantane-2,6-diyl group, etc. and Examples include a spiro ring having a cycloalkyl group such as a spirocyclohexane-1,2'-cyclopentane group, a spiroadamantane-2,3'-cyclopentane group, etc., a norbornyl group or an adamantyl group and a cycloalkyl group bonded thereto in a spiro manner. The number of carbon atoms of the alicyclic hydrocarbon group may be 3 to 18, preferably 3 to 16, and more preferably 3 to 12.

[0011] Examples of the group formed by combining two or more kinds of groups include a group formed by combining an alicyclic hydrocarbon group and a chain hydrocarbon group. In the combination, two or more kinds of alicyclic hydrocarbon groups and chain hydrocarbon groups may be combined respectively. Also, any of the groups may be bonded to X 1 may be. Examples of the group formed by combining an alicyclic hydrocarbon group and a chain hydrocarbon group include, for example, -divalent alicyclic hydrocarbon group-alkanediyl group-, -alkanediyl group-divalent alicyclic hydrocarbon group-alkanediyl group-, -alkanediyl group-divalent alicyclic hydrocarbon group-, etc.

[0012] L 1 The -CH2- contained in the aliphatic hydrocarbon group of may be replaced by -O-, -S-, -SO2-, -SO-, -NR 7 - or -CO-. L 1 The -CH2- contained in the aliphatic hydrocarbon group of is -O-, -S-, -SO2-, -SO-, -NR 7-Or when replaced by -CO-, the number of carbon atoms before replacement is taken as the number of carbon atoms of the aliphatic hydrocarbon group. R 7 Examples of the alkyl group of 7 include a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, a sec-butyl group, a tert-butyl group, a pentyl group, a hexyl group, and the like. When -CH2- contained in the aliphatic hydrocarbon group is replaced by -O-, -S-, -SO2-, -SO-, -NR 7 Examples of the group replaced by - or -CO- include a hydroxy group (a group in which -CH2- contained in the methyl group is replaced by -O-), a carboxy group (a group in which -CH2-CH2- contained in the ethyl group is replaced by -O-CO-), a thiol group (a group in which -CH2- contained in the methyl group is replaced by -S-), an amino group (a group in which -CH2- contained in the methyl group is replaced by -NR 7 -(a group replaced by -), an oxy group (a group in which -CH2- contained in the methylene group is replaced by -O-), a carbonyl group (a group in which -CH2- contained in the methylene group is replaced by -CO-), a thio group (a group in which -CH2- contained in the methylene group is replaced by -S-), a sulfonyl group (a group in which -CH2- contained in the methylene group is replaced by -SO2-), a peptide group (a group in which -CH2-CH2- contained in the ethylene group is replaced by -CO-NR 7 -(a group replaced by -), an alkoxy group (a group in which -CH2- at any position contained in the alkyl group is replaced by -O-), an alkylthio group (a group in which -CH2- at any position contained in the alkyl group is replaced by -S-), an alkylsulfonyl group (a group in which -CH2- at any position contained in the alkyl group is replaced by -SO2-), an alkylamino group (a group in which -CH2- at any position contained in the alkyl group is replaced by -NR 7 -(a group replaced by -), an alkylpeptide group (a group in which -CH2-CH2- at any position contained in the alkyl group is replaced by -CO-NR 7-replaced group), an alkoxycarbonyl group (a group in which any -CH2-CH2- in the alkyl group is replaced by -O-CO-), an alkylcarbonyl group (a group in which any -CH2- in the alkyl group is replaced by -CO-), an alkylcarbonyloxy group (a group in which any -CH2-CH2- in the alkyl group is replaced by -CO-O-), an alkoxycarbonyloxy group (a group in which any -CH2-CH2-CH2- in the alkyl group is replaced by -O-CO-O-), an alkoxyalkoxy group (a group in which two -CH2- at any position in the alkyl group are each replaced by -O-), an alkanediyl-oxy group (a group in which any -CH2- in the alkanediyl group is replaced by -O-), an alkanediyl-oxycarbonyl group (a group in which any -CH2-CH2- in the alkanediyl group is replaced by -O-CO-), an alkanediylcarbonyl group (a group in which any -CH2- in the alkanediyl group is replaced by -CO-), an alkanediylcarbonyloxy group (a group in which any -CH2-CH2- in the alkanediyl group is replaced by -CO-O-), an alkanediyl-oxycarbonyl-oxy group (a group in which any -CH2-CH2-CH2- in the alkanediyl group is replaced by -O-CO-O-), an alkanediylsulfonyl group (a group in which any -CH2- in the alkanediyl group is replaced by -SO2-), an alkanediylthio group (a group in which any -CH2- in the alkanediyl group is replaced by -S-), an alkanediylamino group (a group in which any -CH2- in the alkanediyl group is replaced by -NR 7 -replaced group), an alkanediylpeptide group (a group in which any -CH2-CH2- in the alkanediyl group is replaced by -CO-NR 7 -replaced group), a cycloalkoxy group, a cycloalkylalkoxy group, a group formed by combining two or more of these groups, and the like.

[0013] Examples of the alkoxy group include alkoxy groups having 1 to 27 carbon atoms, such as methoxy group, ethoxy group, propoxy group, butoxy group, pentyloxy group, hexyloxy group, octyloxy group, 2-ethylhexyloxy group, nonyloxy group, decyloxy group, undecyloxy group and the like. The number of carbon atoms of the alkoxy group may be 1 to 17, preferably 1 to 11, more preferably 1 to 6, still more preferably 1 to 4, and even more preferably 1 to 3. Examples of the alkylthio group include alkylthio groups having 1 to 27 carbon atoms, such as methylthio group, ethylthio group, propylthio group, butylthio group, pentylthio group, hexylthio group, octylthio group, 2-ethylhexylthio group, nonylthio group, decylthio group, undecylthio group and the like. The number of carbon atoms of the alkylthio group may be 1 to 17, preferably 1 to 11, more preferably 1 to 6, still more preferably 1 to 4, and even more preferably 1 to 3. Examples of the alkylamino group include alkylamino groups having 1 to 27 carbon atoms, such as methylamino group, ethylamino group, dimethylamino group, propylamino group, butylamino group, pentylamino group, hexylamino group and the like. The number of carbon atoms of the alkylamino group may be 1 to 17, preferably 1 to 11, more preferably 1 to 6, still more preferably 1 to 4, and even more preferably 1 to 3. Examples of the alkyl peptide group include alkyl peptide groups having 1 to 27 carbon atoms, such as methyl peptide group, ethyl peptide group, propyl peptide group and the like. The number of carbon atoms of the alkyl peptide group may be 1 to 17, preferably 1 to 11, more preferably 1 to 6, still more preferably 1 to 4, and even more preferably 1 to 3. Examples of the alkoxycarbonyl group include alkoxycarbonyl groups having 2 to 27 carbon atoms, such as methoxycarbonyl group, ethoxycarbonyl group, butoxycarbonyl group and the like. Examples of the alkylcarbonyl group include alkylcarbonyl groups having 2 to 28 carbon atoms, such as acetyl group, propionyl group and butyryl group and the like. Examples of the alkylcarbonyloxy group include alkylcarbonyloxy groups having 2 to 27 carbon atoms, such as acetyloxy group, propionyloxy group, butyryloxy group and the like. Examples of the alkoxycarbonyloxy group include alkoxycarbonyloxy groups having 2 to 26 carbon atoms, such as butoxycarbonyloxy group and the like. Examples of the alkoxyalkoxy group include alkoxyalkoxy groups having 2 to 26 carbon atoms, such as methoxymethoxy group, methoxyethoxy group, ethoxymethoxy group, ethoxyethoxy group and the like. The number of carbon atoms of the alkoxycarbonyl group may be 2 to 17, preferably 2 to 11, more preferably 2 to 6, still more preferably 2 to 4, and even more preferably 2 or 3. The number of carbon atoms of the alkylcarbonyl group may be 2 to 18, preferably 2 to 12, more preferably 2 to 6, still more preferably 2 to 4, and even more preferably 2 or 3. The number of carbon atoms of the alkylcarbonyloxy group may be 2 to 17, preferably 2 to 11, more preferably 2 to 6, still more preferably 2 to 4, and even more preferably 2 or 3. The number of carbon atoms of the alkoxycarbonyloxy group may be 2 to 16, preferably 2 to 10, more preferably 2 to 6, still more preferably 2 to 4, and even more preferably 2 or 3. The number of carbon atoms of the alkoxyalkoxy group may be 2 to 16, preferably 2 to 10, more preferably 2 to 6, still more preferably 2 to 4, and even more preferably 2 or 3. Examples of the alkylsulfonyl group include alkylsulfonyl groups having 1 to 27 carbon atoms, such as methylsulfonyl group, ethylsulfonyl group, propylsulfonyl group, butylsulfonyl group, pentylsulfonyl group, hexylsulfonyl group, octylsulfonyl group, 2-ethylhexylsulfonyl group, nonylsulfonyl group, decylsulfonyl group, undecylsulfonyl group and the like. The number of carbon atoms of the alkylsulfonyl group may be 1 to 17, preferably 1 to 11, more preferably 1 to 6, still more preferably 1 to 4, and even more preferably 1 to 3. Examples of the alkanediyl-oxy group include alkanediyl-oxy groups having 1 to 27 carbon atoms, such as methylene-oxy group, ethylene-oxy group, propanediyl-oxy group, butanediyl-oxy group, pentanediyl-oxy group and the like. The number of carbon atoms of the alkanediyl-oxy group may be 1 to 17, preferably 1 to 11, more preferably 1 to 6, still more preferably 1 to 4, and even more preferably 1 to 3. Examples of the alkanediyl-oxycarbonyl group include alkanediyl-oxycarbonyl groups having 2 to 27 carbon atoms, such as a methylene-oxycarbonyl group, an ethylene-oxycarbonyl group, a propanediyl-oxycarbonyl group, and a butanediyl-oxycarbonyl group. Examples of the alkanediyl-carbonyl group include alkanediyl-carbonyl groups having 2 to 28 carbon atoms, such as a methylene-carbonyl group, an ethylene-carbonyl group, a propanediyl-carbonyl group, a butanediyl-carbonyl group, and a pentanediyl-carbonyl group. Examples of the alkanediyl-carbonyl-oxy group include alkanediyl-carbonyl-oxy groups having 2 to 27 carbon atoms, such as a methylene-carbonyl-oxy group, an ethylene-carbonyl-oxy group, a propanediyl-carbonyl-oxy group, and a butanediyl-carbonyl-oxy group. Examples of the alkanediyl-oxycarbonyl-oxy group include alkoxycarbonyl-oxy groups having 2 to 26 carbon atoms, such as a butoxycarbonyl-oxy group. The number of carbon atoms in the alkanediyl-oxycarbonyl group may be 2 to 17, preferably 2 to 11, more preferably 2 to 6, still more preferably 2 to 4, and even more preferably 2 or 3. The number of carbon atoms in the alkanediyl-carbonyl group may be 2 to 18, preferably 2 to 12, more preferably 2 to 6, still more preferably 2 to 4, and even more preferably 2 or 3. The number of carbon atoms in the alkanediyl-carbonyl-oxy group may be 2 to 17, preferably 2 to 11, more preferably 2 to 6, still more preferably 2 to 4, and even more preferably 2 or 3. The number of carbon atoms in the alkanediyl-oxycarbonyl-oxy group may be 2 to 16, preferably 2 to 10, more preferably 2 to 6, still more preferably 2 to 4, and even more preferably 2 or 3. Examples of the alkanediylsulfonyl group include alkanediylsulfonyl groups having 1 to 27 carbon atoms, such as a methylenesulfonyl group, an ethylenesulfonyl group, a propylenesulfonyl group, and the like. The number of carbon atoms of the alkanediylsulfonyl group may be 1 to 17, preferably 1 to 11, more preferably 1 to 6, still more preferably 1 to 4, and even more preferably 1 to 3. Examples of the alkanediylthio group include alkanediylthio groups having 1 to 27 carbon atoms, such as a methylenethio group, an ethylenethio group, a propylenethio group, and the like. The number of carbon atoms of the alkanediylthio group may be 1 to 17, preferably 1 to 11, more preferably 1 to 6, still more preferably 1 to 4, and even more preferably 1 to 3. Examples of the alkanediylamino group include alkanediylamino groups having 1 to 27 carbon atoms, such as a methyleneamino group, an ethylenamino group, a dimethyleneamino group, a propylenamino group, a butylenamino group, a pentylenamino group, a hexylenamino group, and the like. The number of carbon atoms of the alkanediylamino group may be 1 to 17, preferably 1 to 11, more preferably 1 to 6, still more preferably 1 to 4, and even more preferably 1 to 3. Examples of the alkanediylpeptide group include alkanediylpeptide groups having 1 to 27 carbon atoms, such as a methylenepeptide group, an ethylenpeptide group, a propylenpeptide group, and the like. The number of carbon atoms of the alkanediylpeptide group may be 1 to 17, preferably 1 to 11, more preferably 1 to 6, still more preferably 1 to 4, and even more preferably 1 to 3. Examples of the cycloalkoxy group include cycloalkoxy groups having 3 to 27 carbon atoms, such as a cyclohexyloxy group, and the like. Examples of the cycloalkylalkoxy group include cycloalkylalkoxy groups having 4 to 27 carbon atoms, such as a cyclohexylmethoxy group, and the like.

[0014] In addition, -CH2- contained in the alicyclic hydrocarbon group is -O-, -S-, -CO-, -SO-, -NR 7Examples of the group replaced by - or -SO2- include the following groups and the like. Among the groups represented below, groups in which -O- is replaced by -S- and -CO- is replaced by -SO2- are also included. The bonding site can be at any position. TIFF2025113197000010.tif54167

[0015] L 1 Examples of the substituent that may be possessed include a halogen atom, a cyano group, a nitro group, and the like. L 1 When L is a group combining an alicyclic hydrocarbon group and a chain hydrocarbon group such as an alkyl group, the chain hydrocarbon group such as an alkyl group can be substantially a substituent of the alicyclic hydrocarbon group. Also, L 1 When -CH2- contained in the chain hydrocarbon group such as an alkyl group contained in L is replaced by -O-, -CO-, -S-, -SO-, -NR 7 - or -SO2-, L 1 can substantially have substituents such as a hydroxy group, a carboxy group, an alkoxy group, an alkylcarbonyl group, an alkoxycarbonyl group, an alkylcarbonyloxy group, an alkoxycarbonyloxy group, an alkoxyalkoxy group, a thiol group, an alkylthio group, an alkylsulfonyl group, an amino group, an alkylamino group, and an alkylpeptide group. Examples of the halogen atom include a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom. L 1 The aliphatic hydrocarbon group of L may have one substituent or a plurality of substituents. L 1 The substituent in L is preferably an alkyl group having 1 to 4 carbon atoms, a hydroxy group, or a halogen atom, more preferably an alkyl group having 1 to 4 carbon atoms or a halogen atom, and even more preferably a methyl group or a fluorine atom.

[0016] L 1Examples include a single bond, a chain hydrocarbon group having 1 to 12 carbon atoms (wherein -CH2- contained in the chain hydrocarbon group may be replaced by -O- or -CO-), an alicyclic hydrocarbon group having 3 to 18 carbon atoms (wherein -CH2- contained in the alicyclic hydrocarbon group may be replaced by -O-, -S-, -CO-, -SO-, -NR 7 - or -SO2-), or a group formed by combining these. Preferably, it is a single bond, a chain hydrocarbon group having 1 to 10 carbon atoms (wherein -CH2- contained in the chain hydrocarbon group may be replaced by -O- or -CO-), an alicyclic hydrocarbon group having 3 to 16 carbon atoms (wherein -CH2- contained in the alicyclic hydrocarbon group may be replaced by -O-, -S-, -CO- or -SO2-), or a group formed by combining these. More preferably, it is a single bond, a linear or branched alkanediyl group having 1 to 8 carbon atoms (wherein -CH2- contained in the alkanediyl group may be replaced by -O- or -CO-), an alicyclic hydrocarbon group having 3 to 12 carbon atoms (wherein -CH2- contained in the alicyclic hydrocarbon group may be replaced by -O-, -S-, -CO- or -SO2-), or a group formed by combining these. Even more preferably, it is a single bond or a linear alkanediyl group having 1 to 6 carbon atoms. L 1 When L is a group formed by combining an alicyclic hydrocarbon group and an alkanediyl group, it is preferably a group represented by the formula (L1-A). TIFF2025113197000011.tif1276[In the formula (L1-A), L 11 represents a single bond or an alkanediyl group having 1 to 3 carbon atoms which may have a substituent, W 11 represents an alicyclic hydrocarbon group having 3 to 12 carbon atoms which may have a substituent (wherein -CH2- contained in the alicyclic hydrocarbon group may be replaced by -O- or -CO-), X 11 represents ***-O-CO-, ***-CO-O-, ***-O-CO-O- or -O-, L 12represents an alkanediyl group having 1 to 3 carbon atoms which may have a single bond or a substituent, *, **, and *** each represent a bonding site, * represents the bonding site with X 1 **, represents the bonding site with the benzene ring, and *** represents the bonding site with W 11 .] L 11 and L 12 As the alkanediyl group of, within the range allowed by the upper limit of the number of carbon atoms, groups similar to the alkanediyl group exemplified by L 1 can be mentioned. W 11 As the alicyclic hydrocarbon group of, within the range allowed by the upper limit of the number of carbon atoms, the alicyclic hydrocarbon groups exemplified by L 1 can be mentioned. W 11 is preferably an alicyclic hydrocarbon group having 3 to 10 carbon atoms. L 11 and L 12 are each independently preferably a single bond or a methylene group. L 1 The bonding position of to the benzene ring may be any of the ortho, meta, or para positions with respect to the bonding position of the carbon atom to which R 5 is bonded, but it is preferably bonded to the ortho or para position.

[0017] R 3 and R 4 Examples of halogen atoms other than the iodine atom of include a fluorine atom, a chlorine atom, a bromine atom, etc. R 3 and R 4The C1-C12 haloalkyl group refers to an alkyl group having 1 to 12 carbon atoms with a halogen atom, and examples include a C1-C12 fluoroalkyl group, a C1-C12 chloroalkyl group, a C1-C12 bromoalkyl group, a C1-C12 iodoalkyl group, etc. Examples of the haloalkyl group include a C1-C12 perfluoroalkyl group (such as a trifluoromethyl group, a pentafluoroethyl group, a heptafluoropropyl group, a nonafluorobutyl group, etc.), a 2,2,2-trifluoroethyl group, a 3,3,3-trifluoropropyl group, a 4,4,4-trifluorobutyl group, a 3,3,4,4,4-pentafluorobutyl group, a chloromethyl group, a bromomethyl group, an iodomethyl group, a fluoromethyl group, a difluoromethyl group, etc. The number of carbon atoms of the haloalkyl group is preferably 1 to 9, more preferably 1 to 6, still more preferably 1 to 4, and even more preferably 1 to 3. R 3 and R 4 Examples of the C1-C18 hydrocarbon group of R and R include chain hydrocarbon groups such as an alkyl group and an alkanediyl group, an alicyclic hydrocarbon group, an aromatic hydrocarbon group, and a group formed by combining these. The alkyl group is a straight-chain or branched alkyl group, and examples include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, a sec-butyl group, a tert-butyl group, a pentyl group, a hexyl group, a heptyl group, a 2-ethylhexyl group, an octyl group, a nonyl group, a decyl group, an undecyl group, and a dodecyl group. The alkanediyl group is a straight-chain or branched alkanediyl group, and examples of the straight-chain alkanediyl group include a methylene group, an ethylene group, a propane-1,3-diyl group, a butane-1,4-diyl group, a pentane-1,5-diyl group, a hexane-1,6-diyl group, a heptane-1,7-diyl group, an octane-1,8-diyl group, a nonane-1,9-diyl group, a decane-1,10-diyl group, an undecane-1,11-diyl group, a dodecane-1,12-diyl group, a tridecane-1,13-diyl group, a tetradecane-1,14-diyl group, a pentadecane-1,15-diyl group, a hexadecane-1,16-diyl group, and a heptadecane-1,17-diyl group, and Examples of the branched alkanediyl group include an ethane-1,1-diyl group, a propane-1,1-diyl group, a propane-1,2-diyl group, a propane-2,2-diyl group, a pentane-2,4-diyl group, a 2-methylpropane-1,3-diyl group, a 2-methylpropane-1,2-diyl group, a pentane-1,4-diyl group, a 2-methylbutane-1,4-diyl group, and the like. The terminal of the branched alkanediyl group may be an alkyl group such as a methyl group. The number of carbon atoms in the chain hydrocarbon group may be 1 to 16, preferably 1 to 12, more preferably 1 to 9, still more preferably 1 to 6, even more preferably 1 to 4, and even more preferably 1 to 3. The alicyclic hydrocarbon group may be either monocyclic or polycyclic, and examples include the groups represented below. The bonding site can be at any position. TIFF2025113197000012.tif46168Specifically, examples of the monocyclic alicyclic hydrocarbon group include monocyclic cycloalkyl groups such as a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cyclooctyl group, a cyclononyl group, a cyclodecyl group, and a cyclododecyl group. Examples of the polycyclic alicyclic hydrocarbon group include cycloalkyl groups such as a decahydronaphthyl group, an adamantyl group, a norbornyl group, a spirocyclohexane-1,2'-cyclopentane group, and a spiroadamantane-2,3'-cyclopentane group, and polycyclic cycloalkyl groups such as a spiro ring having a cycloalkyl group spiro-bonded to each of a norbornyl group or an adamantyl group. The number of carbon atoms in the alicyclic hydrocarbon group is preferably 3 to 18, more preferably 3 to 16, and still more preferably 3 to 12. Examples of the aromatic hydrocarbon group include a phenyl group, a naphthyl group, a biphenyl group, an anthryl group, a phenanthryl group, and a binaphthyl group. The number of carbon atoms in the aromatic hydrocarbon group is preferably 6 to 18, more preferably 6 to 14, and still more preferably 6 to 10.

[0018] Examples of the group formed by combination include a group combining an aromatic hydrocarbon group and a chain hydrocarbon group (for example, aromatic hydrocarbon group-alkanediyl group-*, alkyl group-aromatic hydrocarbon group-*, alkyl group-aromatic hydrocarbon group-alkanediyl group-*, -CH2- contained in the alkanediyl group and the alkyl group may be replaced by -O-, -CO-, -S-, -SO-, -NR 7 - or -SO2-.), a group combining an alicyclic hydrocarbon group and a chain hydrocarbon group (for example, alicyclic hydrocarbon group-alkanediyl group-*, alkyl group-alicyclic hydrocarbon group-*, alkyl group-alicyclic hydrocarbon group-alkanediyl group-*, -CH2- contained in the alicyclic hydrocarbon group, the alkanediyl group and the alkyl group may be replaced by -O-, -CO-, -S-, -SO-, -NR 7 - or -SO2-.), a group combining an aromatic hydrocarbon group and an alicyclic hydrocarbon group (for example, aromatic hydrocarbon group-alicyclic hydrocarbon group-*, alicyclic hydrocarbon group-aromatic hydrocarbon group-*, -CH2- contained in the alicyclic hydrocarbon group may be replaced by -O-, -CO-, -S-, -SO-, -NR 7 - or -SO2-.). * represents a bonding site. Examples of the aromatic hydrocarbon group-alkanediyl group-* include aralkyl groups such as benzyl group and phenethyl group. Examples of the alkyl group-aromatic hydrocarbon group-* include tolyl group, xylyl group, cumenyl group and the like. Examples of the alicyclic hydrocarbon group-alkanediyl group-* include cycloalkylalkyl groups such as cyclohexylmethyl group, cyclohexylethyl group, 1-(adamantan-1-yl)methyl group, 1-(adamantan-1-yl)-1-methylethyl group and the like. Examples of the alkyl group-alicyclic hydrocarbon group-* include cycloalkyl groups having an alkyl group such as methylcyclohexyl group, dimethylcyclohexyl group, 2-alkyladamantan-2-yl group and the like. Examples of the aromatic hydrocarbon group-alicyclic hydrocarbon group-* include phenylcyclohexyl group and the like. Examples of the alicyclic hydrocarbon group-aromatic hydrocarbon group-* include a cyclohexylphenyl group and the like. In the combination, two or more alicyclic hydrocarbon groups, aromatic hydrocarbon groups, and chain hydrocarbon groups may be combined with each other. Further, any of these groups may be bonded to the benzene ring.

[0019] R 3 and R 4 When -CH2- contained in the haloalkyl group or hydrocarbon group represented by is replaced with -O-, -CO-, -S-, -SO-, -NR 7 -, or -SO2-, the total carbon number of the haloalkyl group or the hydrocarbon group is the carbon number before replacement. Further, the number may be one or two or more. Examples of the group in which -CH2- contained in the haloalkyl group and hydrocarbon group is replaced with -O-, -S-, -SO2-, -SO-, -NR 7 -, or -CO- include a hydroxy group (a group in which -CH2- contained in the methyl group is replaced with -O-), a carboxy group (a group in which -CH2-CH2- contained in the ethyl group is replaced with -O-CO-), a thiol group (a group in which -CH2- contained in the methyl group is replaced with -S-), an amino group (a group in which -CH2- contained in the methyl group is replaced with -NR 7 -), an oxy group (a group in which -CH2- contained in the methylene group is replaced with -O-), a carbonyl group (a group in which -CH2- contained in the methylene group is replaced with -CO-), a thio group (a group in which -CH2- contained in the methylene group is replaced with -S-), a sulfonyl group (a group in which -CH2- contained in the methylene group is replaced with -SO2-), a peptide group (a group in which -CH2-CH2- contained in the ethylene group is replaced with -CO-NR 7-replaced group), alkoxy group (a group in which any -CH2- at any position in the alkyl group is replaced by -O-), alkoxycarbonyl group (a group in which any -CH2-CH2- at any position in the alkyl group is replaced by -O-CO-), alkylcarbonyl group (a group in which any -CH2- at any position in the alkyl group is replaced by -CO-), alkylcarbonyloxy group (a group in which any -CH2-CH2- at any position in the alkyl group is replaced by -CO-O-), alkoxycarbonyloxy group (a group in which any -CH2-CH2-CH2- at any position in the alkyl group is replaced by -O-CO-O-), alkoxyalkoxy group (a group in which two -CH2- at any position in the alkyl group are replaced by -O-), alkylthio group (a group in which any -CH2- at any position in the alkyl group is replaced by -S-), alkylsulfonyl group (a group in which any -CH2- at any position in the alkyl group is replaced by -SO2-), alkylamino group (a group in which any -CH2- at any position in the alkyl group is replaced by -NR 7 -replaced group), alkylpeptide group (a group in which any -CH2-CH2- at any position in the alkyl group is replaced by -CO-NR 7-replaced group), an alkanediyl-oxy group (a group in which any -CH2- in the alkanediyl group is replaced by -O-), an alkanediyl-oxycarbonyl group (a group in which any -CH2-CH2- in the alkanediyl group is replaced by -O-CO-), an alkanediyl-carbonyl group (a group in which any -CH2- in the alkanediyl group is replaced by -CO-), an alkanediyl-carbonyl-oxy group (a group in which any -CH2-CH2- in the alkanediyl group is replaced by -CO-O-), an alkanediyl-oxycarbonyl-oxy group (a group in which any -CH2-CH2-CH2- in the alkanediyl group is replaced by -O-CO-O-), an alkanediyl-thio group (a group in which any -CH2- in the alkanediyl group is replaced by -S-), an alkanediyl-sulfonyl group (a group in which any -CH2- in the alkanediyl group is replaced by -SO2-), an alkanediyl-amino group (a group in which any -CH2- in the alkanediyl group is replaced by -NR 7 -replaced group), an alkanediyl-peptide group (a group in which any -CH2-CH2- in the alkanediyl group is replaced by -CO-NR 7 -replaced group), a cycloalkoxy group, a cycloalkyl-alkoxy group, an aromatic-hydrocarbon group-carbonyl-oxy group, an aromatic-hydrocarbon group-carbonyl group, an aromatic-hydrocarbon group-oxy group, a haloalkoxy group (a group in which any -CH2- in the haloalkyl group is replaced by -O-), a haloalkoxycarbonyl group (a group in which any -CH2-CH2- in the haloalkyl group is replaced by -O-CO-), a haloalkyl-carbonyl group (a group in which any -CH2- in the haloalkyl group is replaced by -CO-), a haloalkyl-carbonyl-oxy group (a group in which any -CH2-CH2- in the haloalkyl group is replaced by -CO-O-), a group formed by combining two or more of these groups, etc. Examples of the alkoxy group include alkoxy groups having 1 to 17 carbon atoms, such as methoxy group, ethoxy group, propoxy group, butoxy group, pentyloxy group, hexyloxy group, octyloxy group, 2-ethylhexyloxy group, nonyloxy group, decyloxy group, undecyloxy group and the like. The number of carbon atoms of the alkoxy group is preferably 1 to 11, more preferably 1 to 6, still more preferably 1 to 4, and even more preferably 1 to 3. Examples of the alkylthio group include alkylthio groups having 1 to 17 carbon atoms, such as methylthio group, ethylthio group, propylthio group, butylthio group, pentylthio group, hexylthio group, octylthio group, 2-ethylhexylthio group, nonylthio group, decylthio group, undecylthio group and the like. The number of carbon atoms of the alkylthio group is preferably 1 to 11, more preferably 1 to 6, still more preferably 1 to 4, and even more preferably 1 to 3. Examples of the alkylamino group include alkylamino groups having 1 to 17 carbon atoms, such as methylamino group, ethylamino group, dimethylamino group, propylamino group, butylamino group, pentylamino group, pentylamino group, hexylamino group and the like. The number of carbon atoms of the alkylamino group is preferably 1 to 11, more preferably 1 to 6, still more preferably 1 to 4, and even more preferably 1 to 3. Examples of the alkylpeptide group include alkylpeptide groups having 1 to 17 carbon atoms, such as methylpeptide group, ethylpeptide group, propylpeptide group and the like. The number of carbon atoms of the alkylpeptide group is preferably 1 to 11, more preferably 1 to 6, still more preferably 1 to 4, and even more preferably 1 to 3. Examples of the alkoxycarbonyl group include alkoxycarbonyl groups having 2 to 17 carbon atoms, such as a methoxycarbonyl group, an ethoxycarbonyl group, and a butoxycarbonyl group. Examples of the alkylcarbonyl group include alkylcarbonyl groups having 2 to 18 carbon atoms, such as an acetyl group, a propionyl group, and a butyryl group. Examples of the alkylcarbonyloxy group include alkylcarbonyloxy groups having 2 to 17 carbon atoms, such as an acetyloxy group, a propionyloxy group, and a butyryloxy group. Examples of the alkoxycarbonyloxy group include alkoxycarbonyloxy groups having 2 to 16 carbon atoms, such as a butoxycarbonyloxy group. Examples of the alkoxyalkoxy group include alkoxyalkoxy groups having 2 to 16 carbon atoms, such as a methoxymethoxy group, a methoxyethoxy group, an ethoxymethoxy group, and an ethoxyethoxy group. The number of carbon atoms of the alkoxycarbonyl group is preferably 2 to 11, more preferably 2 to 6, still more preferably 2 to 4, and even more preferably 2 or 3. The number of carbon atoms of the alkylcarbonyl group is preferably 2 to 12, more preferably 2 to 6, still more preferably 2 to 4, and even more preferably 2 or 3. The number of carbon atoms of the alkylcarbonyloxy group is preferably 2 to 11, more preferably 2 to 6, still more preferably 2 to 4, and even more preferably 2 or 3. The number of carbon atoms of the alkoxycarbonyloxy group is preferably 2 to 10, more preferably 2 to 6, still more preferably 2 to 4, and even more preferably 2 or 3. The number of carbon atoms of the alkoxyalkoxy group is preferably 2 to 10, more preferably 2 to 6, still more preferably 2 to 4, and even more preferably 2 or 3. Examples of the alkylsulfonyl group include alkylsulfonyl groups having 1 to 17 carbon atoms, such as methylsulfonyl group, ethylsulfonyl group, propylsulfonyl group, butylsulfonyl group, pentylsulfonyl group, hexylsulfonyl group, octylsulfonyl group, 2-ethylhexylsulfonyl group, nonylsulfonyl group, decylsulfonyl group, undecylsulfonyl group and the like. The number of carbon atoms of the alkylsulfonyl group is preferably 1 to 11, more preferably 1 to 6, still more preferably 1 to 4, and even more preferably 1 to 3. Examples of the alkanediyl-oxy group include alkanediyl-oxy groups having 1 to 17 carbon atoms, such as methyleneoxy group, ethyleneoxy group, propanediyl-oxy group, butanediyl-oxy group, pentanediyl-oxy group and the like. The number of carbon atoms of the alkanediyl-oxy group is preferably 1 to 11, more preferably 1 to 6, still more preferably 1 to 4, and even more preferably 1 to 3. Examples of the alkanediyl-oxycarbonyl group include alkanediyl-oxycarbonyl groups having 2 to 17 carbon atoms, such as a methylene-oxycarbonyl group, an ethylene-oxycarbonyl group, a propanediyl-oxycarbonyl group, and a butanediyl-oxycarbonyl group. Examples of the alkanediyl-carbonyl group include alkanediyl-carbonyl groups having 2 to 18 carbon atoms, such as a methylene-carbonyl group, an ethylene-carbonyl group, a propanediyl-carbonyl group, a butanediyl-carbonyl group, and a pentanediyl-carbonyl group. Examples of the alkanediyl-carbonyl-oxy group include alkanediyl-carbonyl-oxy groups having 2 to 17 carbon atoms, such as a methylene-carbonyl-oxy group, an ethylene-carbonyl-oxy group, a propanediyl-carbonyl-oxy group, and a butanediyl-carbonyl-oxy group. Examples of the alkanediyl-oxycarbonyl-oxy group include alkoxycarbonyl-oxy groups having 2 to 16 carbon atoms, such as a butoxycarbonyl-oxy group. The number of carbon atoms of the alkanediyl-oxycarbonyl group is preferably 2 to 11, more preferably 2 to 6, still more preferably 2 to 4, and even more preferably 2 or 3. The number of carbon atoms of the alkanediyl-carbonyl group is preferably 2 to 12, more preferably 2 to 6, still more preferably 2 to 4, and even more preferably 2 or 3. The number of carbon atoms of the alkanediyl-carbonyl-oxy group is preferably 2 to 11, more preferably 2 to 6, still more preferably 2 to 4, and even more preferably 2 or 3. The number of carbon atoms of the alkanediyl-oxycarbonyl-oxy group is preferably 2 to 10, more preferably 2 to 6, still more preferably 2 to 4, and even more preferably 2 or 3. Examples of the alkanediyl-thio group include alkanediyl-thio groups having 1 to 17 carbon atoms, such as a methylene-thio group, an ethylene-thio group, and a propylene-thio group. The number of carbon atoms of the alkanediyl-thio group is preferably 1 to 11, more preferably 1 to 6, still more preferably 1 to 4, and even more preferably 1 to 3. Examples of the alkanediylsulfonyl group include alkanediylsulfonyl groups having 1 to 17 carbon atoms, such as a methylenesulfonyl group, an ethylenesulfonyl group, a propylenesulfonyl group, etc. The number of carbon atoms of the alkanediylsulfonyl group is preferably 1 to 11, more preferably 1 to 6, still more preferably 1 to 4, and even more preferably 1 to 3. Examples of the alkanediylamino group include alkanediylamino groups having 1 to 17 carbon atoms, such as a methyleneamino group, an ethyleneamino group, a dimethyleneamino group, a propyleneamino group, a butyleneamino group, a pentyleneamino group, a hexyleneamino group, etc. The number of carbon atoms of the alkanediylamino group is preferably 1 to 11, more preferably 1 to 6, still more preferably 1 to 4, and even more preferably 1 to 3. Examples of the alkanediylpeptide group include alkanediylpeptide groups having 1 to 17 carbon atoms, such as a methylenepeptide group, an ethylenepeptide group, a propylenepeptide group, etc. The number of carbon atoms of the alkanediylpeptide group is preferably 1 to 11, more preferably 1 to 6, still more preferably 1 to 4, and even more preferably 1 to 3. Examples of the cycloalkoxy group include cycloalkoxy groups having 3 to 17 carbon atoms, such as a cyclohexyloxy group, etc. Examples of the cycloalkylalkoxy group include cycloalkylalkoxy groups having 4 to 17 carbon atoms, such as a cyclohexylmethoxy group, etc. Examples of the aromatic hydrocarbon group - carbonyloxy group include aromatic hydrocarbon group - carbonyloxy groups having 7 to 17 carbon atoms, such as a benzoyloxy group, etc. Examples of the aromatic hydrocarbon group - carbonyl group include aromatic hydrocarbon group - carbonyl groups having 7 to 18 carbon atoms, such as a benzoyl group, etc. Examples of the aromatic hydrocarbon group - oxy group include aromatic hydrocarbon group - oxy groups having 6 to 17 carbon atoms, such as a phenyloxy group, etc. Examples of the haloalkoxy group, haloalkoxycarbonyl group, haloalkylcarbonyl group, and haloalkylcarbonyloxy group include a haloalkoxy group having 1 to 11 carbon atoms, a haloalkoxycarbonyl group having 2 to 11 carbon atoms, a haloalkylcarbonyl group having 2 to 12 carbon atoms, and a haloalkylcarbonyloxy group having 2 to 11 carbon atoms. For example, groups in which one or more hydrogen atoms of the groups exemplified above are replaced with a halogen atom can be mentioned.

[0020] In addition, examples of the group in which -CH2- contained in the alicyclic hydrocarbon group is replaced with -O-, -S-, -SO2-, -SO-, -NR 7 - or -CO- include the groups represented below. Among the groups represented below, groups in which -O- is replaced with -S- and -CO- is replaced with -SO2- are also included. The bonding site can be at any position. TIFF2025113197000013.tif54167 Examples of the group in which -CH2- contained in a group combining an alicyclic hydrocarbon group and an aromatic hydrocarbon group is replaced with -O-, -CO-, -S-, -SO-, -SO2- or -NR 7 - include the following groups. -O- or -CO- in the groups represented below may be replaced with -S-, -SO-, -SO2- or -NR 7 - respectively. The bonding site can be at any position. TIFF2025113197000014.tif38164

[0021] R 3 and R 4 Examples of the substituent that the hydrocarbon group of may have include a halogen atom, a cyano group, a nitro group, etc. R 3 and R 4 By replacing -CH2- contained in - with -O-, -S-, -CO-, -SO-, -NR 7 - or -SO2-, substantially, R 3 and R 4can have substituents such as a hydroxy group, a carboxy group, an alkoxy group, an alkoxycarbonyl group, an alkylcarbonyl group, an alkylcarbonyloxy group, an alkoxycarbonyloxy group, an alkoxyalkoxy group, a thiol group, an alkylthio group, an alkylsulfonyl group, an amino group, an alkylamino group, an alkylpeptide group, etc. Also, R 3 and R 4 When they are groups combining an alicyclic hydrocarbon group or an aromatic hydrocarbon group with a chain hydrocarbon group such as an alkyl group, the chain hydrocarbon group such as an alkyl group can be substantially a substituent of the alicyclic hydrocarbon group or the aromatic hydrocarbon group. Examples of the halogen atom include the same groups as those described above. The hydrocarbon group may have one substituent or a plurality of substituents. R 3 and R 4 are preferably a halogen atom other than an iodine atom, an alkyl group having 1 to 6 carbon atoms or a haloalkyl group having 1 to 6 carbon atoms (wherein -CH2- contained in the alkyl group or the haloalkyl group may be replaced by -O- or -CO-), more preferably a halogen atom other than an iodine atom, an alkyl group having 1 to 4 carbon atoms (wherein -CH2- contained in the alkyl group may be replaced by -O- or -CO-) or a haloalkyl group having 1 to 4 carbon atoms, still more preferably a fluorine atom, a hydroxy group, an alkoxy group having 1 to 3 carbon atoms, a hydroxyalkyl group having 1 to 3 carbon atoms, a carboxy group or a fluoroalkyl group having 1 to 3 carbon atoms, even more preferably a fluorine atom, a hydroxy group, an alkoxy group having 1 to 3 carbon atoms, a carboxy group or a perfluoroalkyl group having 1 to 3 carbon atoms, and even more preferably a fluorine atom, a hydroxy group, a methoxy group or a trifluoromethyl group. m3 is any integer from 1 to 3, more preferably 1 or 2, and even more preferably 1. When m3 is an integer of 1 or more, at least one of R 3 is preferably an alkoxy group having 1 to 3 carbon atoms. m4 is an integer of any one of 0 to 3, more preferably an integer of any one of 0 to 2, and even more preferably 0 or 1. When m4 is an integer of 1 or more, R 4 At least one of them is preferably an alkoxy group having 1 to 3 carbon atoms. m5 is an integer of any one of 1 to 3, more preferably 1 or 2, and even more preferably 1. m6 is an integer of any one of 1 to 4, more preferably an integer of any one of 1 to 3, and even more preferably 1 or 2. R 3 and R 4 The bonding positions to the benzene ring are each independently any of the ortho position, meta position or para position with respect to the bonding position of the carbon atom to which R 5 is bonded, but at least one is preferably bonded to the meta position. The bonding position of the iodine atom to the benzene ring may be any of the ortho position, meta position or para position with respect to the bonding position of the carbon atom to which R 5 is bonded, but at least one is preferably bonded to the meta position.

[0022] R 5 Examples of the halogen atom of R 1 include the same halogen atoms as the substituents that L R 5 The alkyl group having 1 to 6 carbon atoms in R is a linear or branched alkyl group, and examples thereof include alkyl groups such as methyl group, ethyl group, propyl group, isopropyl group, butyl group, isobutyl group, tert-butyl group, pentyl group, and hexyl group. R 5The alkyl group may be a haloalkyl group which is an alkyl group having a halogen atom. Examples of the haloalkyl group include alkyl fluoride groups having 1 to 6 carbon atoms, alkyl chloride groups having 1 to 6 carbon atoms, alkyl bromide groups having 1 to 6 carbon atoms, alkyl iodide groups having 1 to 6 carbon atoms, and the like. Examples of the haloalkyl group include perfluoroalkyl groups having 1 to 6 carbon atoms (such as trifluoromethyl group, pentafluoroethyl group, etc.), chloromethyl group, bromomethyl group, iodomethyl group, and the like. The number of carbon atoms of the alkyl group is preferably 1 to 4, more preferably 1 to 3. R 5 is preferably a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, and more preferably a hydrogen atom or a methyl group.

[0023] Examples of the anion (I) include the following anions. TIFF2025113197000015.tif106163

[0024] 〔Cation (I)〕 ZI + Examples of the organic cation of include organic onium cations, organic sulfonium cations, organic iodonium cations, organic ammonium cations, benzothiazolium cations, and organic phosphonium cations. Among these, organic sulfonium cations and organic iodonium cations are preferred, and arylsulfonium cations are more preferred. Specifically, cations represented by any of formula (b2-1) to formula (b2-5) (hereinafter, may be referred to as "cation (b2-1)" etc. according to the formula number) are included. TIFF2025113197000016.tif82159[In formula (b2-1) to formula (b2-5), R b4 ~R b6Each independently represents a chain hydrocarbon group having 1 to 30 carbon atoms, an alicyclic hydrocarbon group having 3 to 36 carbon atoms, or an aromatic hydrocarbon group having 6 to 36 carbon atoms, and the hydrogen atoms contained in the chain hydrocarbon group may be substituted with a hydroxy group, an alkoxy group having 1 to 12 carbon atoms, an alicyclic hydrocarbon group having 3 to 12 carbon atoms, or an aromatic hydrocarbon group having 6 to 18 carbon atoms. The hydrogen atoms contained in the alicyclic hydrocarbon group may be substituted with a halogen atom, an aliphatic hydrocarbon group having 1 to 18 carbon atoms, an alkylcarbonyl group having 2 to 4 carbon atoms, or a glycidyloxy group. The hydrogen atoms contained in the aromatic hydrocarbon group may be substituted with a halogen atom, a hydroxy group, an aliphatic hydrocarbon group having 1 to 18 carbon atoms, a fluorinated alkyl group having 1 to 12 carbon atoms, or an alkoxy group having 1 to 12 carbon atoms. R b4 and R b5 may be bonded to each other to form a ring together with the sulfur atom to which they are bonded, and the -CH2- contained in the ring may be replaced with -O-, -S-, or -CO-. R b7 and R b8 each independently represents a halogen atom, a hydroxy group, an aliphatic hydrocarbon group having 1 to 12 carbon atoms, a fluorinated alkyl group having 1 to 12 carbon atoms, or an alkoxy group having 1 to 12 carbon atoms. m2 and n2 each independently represent any integer from 0 to 5. When m2 is 2 or more, the plurality of R b7 may be the same or different, and when n2 is 2 or more, the plurality of R b8 may be the same or different. R b9 and R b10 each independently represents a chain hydrocarbon group having 1 to 36 carbon atoms or an alicyclic hydrocarbon group having 3 to 36 carbon atoms. R b9 and R b10 may be bonded to each other to form a ring together with the sulfur atom to which they are bonded, and the -CH2- contained in the ring may be replaced with -O-, -S-, or -CO-. R b11represents a hydrogen atom, a chain hydrocarbon group having 1 to 36 carbon atoms, an alicyclic hydrocarbon group having 3 to 36 carbon atoms, or an aromatic hydrocarbon group having 6 to 18 carbon atoms. R b12 represents a chain hydrocarbon group having 1 to 12 carbon atoms, an alicyclic hydrocarbon group having 3 to 18 carbon atoms, or an aromatic hydrocarbon group having 6 to 18 carbon atoms, and a hydrogen atom contained in the chain hydrocarbon group may be substituted with an aromatic hydrocarbon group having 6 to 18 carbon atoms, and a hydrogen atom contained in the aromatic hydrocarbon group may be substituted with an alkoxy group having 1 to 12 carbon atoms or an alkylcarbonyloxy group having 1 to 12 carbon atoms. R b11 and R b12 and may be bonded to each other to form a ring including -CH-CO- to which they are bonded, and -CH2- contained in the ring may be replaced with -O-, -S- or -CO-. R b13 ~R b18 and R b21 ~R b26 each independently represents a halogen atom, a hydroxy group, an aliphatic hydrocarbon group having 1 to 12 carbon atoms, a fluoroalkyl group having 1 to 12 carbon atoms, or an alkoxy group having 1 to 12 carbon atoms. R b13 and R b14 and R b21 and R b22 and may be bonded to each other to form a ring containing a sulfur atom together with the benzene ring to which they are bonded, and -CH2- contained in the ring may be replaced with -O-, -S- or -CO-. R b27 ~R b29 each independently represents a hydrogen atom or a group containing an acid-labile group. L b31 and L b41 ~L b43 each independently represents a sulfur atom or an oxygen atom. o2, p2, s2, and t2 each independently represent any integer from 0 to 5. q2 and r2 each independently represent any integer from 0 to 4. u2 represents 0 or 1. When o2 is 2 or more, a plurality of R b13are the same or different, and when p2 is 2 or more, a plurality of Rs b14 are the same or different, and when q2 is 2 or more, a plurality of Rs b15 are the same or different, and when r2 is 2 or more, a plurality of Rs b16 are the same or different, and when s2 is 2 or more, a plurality of Rs b17 are the same or different, and when t2 is 2 or more, a plurality of Rs b18 are the same or different. u3 represents any integer from 1 to 3 and satisfies 1 ≦ u3 + q23 ≦ 5. u4 and u5 each independently represent any integer from 0 to 3 and satisfy 0 ≦ u4 + o21 ≦ 5 and 0 ≦ u5 + p22 ≦ 5. o21, p22, q23, r24, t25 and s26 each independently represent any integer from 0 to 4. When u3, u4 and u5 are each 2 or more, the groups in the plurality of parentheses are each the same or different. When o21, p22, q23, r24, t25 and s26 are each 2 or more, a plurality of Rs b21 ~R b26 are each the same or different.] When u2 is 0, any one of o2, p2, q2 and r2 is 1 or more, and at least one of R b13 ~R b16 is preferably a halogen atom. When u2 is 1, any one of o2, p2, s2, t2, q2 and r2 is 1 or more, and at least one of R b13 ~R b18 is preferably a halogen atom. Furthermore, when u2 is 0, r2 is preferably 1 or more, more preferably 1. Also, when u2 is 0 and r2 is 1 or more, R b16 is preferably a halogen atom.

[0025] The aliphatic hydrocarbon group represents a chain hydrocarbon group and an alicyclic hydrocarbon group. Examples of the chain hydrocarbon group include alkyl groups such as methyl group, ethyl group, propyl group, isopropyl group, butyl group, sec-butyl group, tert-butyl group, pentyl group, hexyl group, octyl group, and 2-ethylhexyl group. In particular, R b9 ~R b12 The chain hydrocarbon group is preferably a group having 1 to 12 carbon atoms. The alicyclic hydrocarbon group may be either monocyclic or polycyclic. Examples of the monocyclic alicyclic hydrocarbon group include cycloalkyl groups such as cyclopropyl group, cyclobutyl group, cyclopentyl group, cyclohexyl group, cycloheptyl group, cyclooctyl group, and cyclodecyl group. Examples of the polycyclic alicyclic hydrocarbon group include decahydronaphthyl group, adamantyl group, norbornyl group, and the following groups. TIFF2025113197000017.tif11157In particular, R b9 ~R b12 The alicyclic hydrocarbon group is preferably a group having 3 to 18 carbon atoms, more preferably 4 to 12 carbon atoms. Examples of the alicyclic hydrocarbon group in which a hydrogen atom is substituted with an aliphatic hydrocarbon group include methylcyclohexyl group, dimethylcyclohexyl group, 2-methyladamantan-2-yl group, 2-ethyladamantan-2-yl group, 2-isopropyladamantan-2-yl group, methylnorbornyl group, isobornyl group, and the like. In the alicyclic hydrocarbon group in which a hydrogen atom is substituted with an aliphatic hydrocarbon group, the total number of carbon atoms of the alicyclic hydrocarbon group and the aliphatic hydrocarbon group is preferably 20 or less. The alkyl fluoride group represents an alkyl group having 1 to 12 carbon atoms and having a fluorine atom, and examples thereof include fluoromethyl group, difluoromethyl group, trifluoromethyl group, and perfluorobutyl group. The number of carbon atoms of the alkyl fluoride group is preferably 1 to 9, more preferably 1 to 6, and even more preferably 1 to 4. Examples of the aromatic hydrocarbon group include aryl groups such as phenyl group, biphenyl group, naphthyl group, and phenanthryl group. The aromatic hydrocarbon group may have a chain hydrocarbon group or an alicyclic hydrocarbon group. Examples of the aromatic hydrocarbon group having a chain hydrocarbon group include tolyl group, xylyl group, cumenyl group, mesityl group, p-ethylphenyl group, p-tert-butylphenyl group, 2,6-diethylphenyl group, 2-methyl-6-ethylphenyl group, etc., and examples of the aromatic hydrocarbon group having an alicyclic hydrocarbon group include p-cyclohexylphenyl group, p-adamantylphenyl group, etc. When the aromatic hydrocarbon group has a chain hydrocarbon group or an alicyclic hydrocarbon group, a chain hydrocarbon group having 1 to 18 carbon atoms and an alicyclic hydrocarbon group having 3 to 18 carbon atoms are preferable. Examples of the aromatic hydrocarbon group in which a hydrogen atom is substituted with an alkoxy group include p-methoxyphenyl group, etc. Examples of the chain hydrocarbon group in which a hydrogen atom is substituted with an aromatic hydrocarbon group include aralkyl groups such as benzyl group, phenethyl group, phenylpropyl group, trityl group, naphthylmethyl group, naphthylethyl group, etc.

[0026] Examples of the alkoxy group include methoxy group, ethoxy group, propoxy group, butoxy group, pentyloxy group, hexyloxy group, heptyloxy group, octyloxy group, decyloxy group, and dodecyloxy group, etc. Examples of the alkylcarbonyl group include acetyl group, propionyl group, and butyryl group, etc. Examples of the halogen atom include fluorine atom, chlorine atom, bromine atom, and iodine atom, etc. Examples of the alkylcarbonyloxy group include methylcarbonyloxy group, ethylcarbonyloxy group, propylcarbonyloxy group, isopropylcarbonyloxy group, butylcarbonyloxy group, sec-butylcarbonyloxy group, tert-butylcarbonyloxy group, pentylcarbonyloxy group, hexylcarbonyloxy group, octylcarbonyloxy group, and 2-ethylhexylcarbonyloxy group, etc. R b4 and R b5The ring formed by the combination of them together with the sulfur atom to which they are attached may be any of monocyclic, polycyclic, aromatic, non-aromatic, saturated and unsaturated rings. Examples of this ring include rings having 3 to 18 carbon atoms, preferably rings having 4 to 18 carbon atoms. In addition, examples of the ring containing a sulfur atom include 3-membered to 12-membered rings, preferably 3-membered to 7-membered rings, and examples thereof include the following rings. * represents a bonding site. TIFF2025113197000018.tif24142R b9 and R b10 The ring formed by their combination may be any of monocyclic, polycyclic, aromatic, non-aromatic, saturated and unsaturated rings. Examples of this ring include 3-membered to 12-membered rings, preferably 3-membered to 7-membered rings. Examples thereof include thiolan-1-ium ring (tetrahydrothiophenium ring), thian-1-ium ring, 1,4-oxathian-4-ium ring and the like. R b11 and R b12 The ring formed by their combination may be any of monocyclic, polycyclic, aromatic, non-aromatic, saturated and unsaturated rings. Examples of this ring include 3-membered to 12-membered rings, preferably 3-membered to 7-membered rings. Examples thereof include oxocycloheptane ring, oxocyclohexane ring, oxonorbornane ring, oxoadamantane ring and the like. R b27 ~R b29 Examples of the group containing an acid-labile group of ~R include -R c30 , -CO-O-R c30 or -L c10 -CO-O-R c30 The group represented by (L c10 represents an alkanediyl group having 1 to 6 carbon atoms, and R c30 represents an acid-labile group.). Examples thereof include the like. R b27 ~R b29 Examples of the acid-labile group of ~R include groups represented by formula (1) or formula (2) exemplified in the present specification.

[0027] Among cations (b2-1) to (b2-5), preferably, cation (b2-1), cation (b2-4) or cation (b2-5). Examples of the cation (b2-1) include the following cations. TIFF2025113197000019.tif158165 Examples of the cation (b2-2) include the following cations. TIFF2025113197000020.tif18150 Examples of the cation (b2-3) include the following cations. TIFF2025113197000021.tif26140 Examples of the cation (b2-4) include the following cations. TIFF2025113197000022.tif123164 Examples of the cation (b2-5) include the following cations. TIFF2025113197000023.tif115158

[0028] Specific examples of the salt (I) include salts obtained by arbitrarily combining the above-mentioned cations and anions. Specific examples of the salt (I) are shown in the following table. In the following table, each symbol represents the symbol attached to the structure representing the above-mentioned anion or cation, and "~" indicates that each of the salt (I) and the anion (I) corresponds. For example, the salt (I-1) is a salt composed of the anion represented by the formula (Ia-1) and the cation represented by the formula (b2-c-1), the salt (I-2) is a salt composed of the anion represented by the formula (Ia-2) and the cation represented by the formula (b2-c-1), and the salt (I-11) is a salt composed of the anion represented by the formula (Ia-1) and the cation represented by the formula (b2-c-10). TIFF2025113197000024.tif3078

Table 1

[0029] Among them, as the salt (I), it is preferable that the salt is a combination of an anion represented by any one of the formulas (Ia-1) to (Ia-11) and a cation represented by any one of the formulas (b2-c-1), (b2-c-10), (b2-c-13), (b2-c-14), (b2-c-18) to (b2-c-20), (b2-c-27), (b2-c-30), (b2-c-31), (b2-c-47), (b2-c-48), (b2-c-50) to (b2-c-68).

[0030] <Method for producing salt (I)> In the salt (I), X 1 When *-O-CO- (the salt represented by the formula (I1-1) or the formula (I2-1)), for example, it can be produced by reacting a compound represented by the formula (I1-b1) or a compound represented by the formula (I2-b1) with carbonyldiimidazole in a solvent and then further reacting with the salt represented by the formula (I1-a). TIFF2025113197000027.tif71162 (In the formula, all symbols represent the same meanings as described above respectively.) Examples of the solvent in this reaction include chloroform, acetonitrile and the like. The reaction temperature is usually 5°C to 80°C, and the reaction time is usually 0.5 hour to 24 hours. Examples of the salt represented by the formula (I1-a) include salts represented by the following formula, etc., which can be easily obtained from the market and can also be easily produced by known production methods.

[0031] Examples of the salt represented by the formula (I1-a) include salts represented by the following formula, etc., which can be easily obtained from the market and can also be easily produced by known production methods. TIFF2025113197000028.tif48162 Examples of the compound represented by the formula (I1-b1) include compounds represented by the following formula, etc., which can be easily obtained from the market. As the compound represented by TIFF2025113197000029.tif2464 (I2-b1), compounds represented by the following formula etc. may be mentioned, and they are easily available on the market. TIFF2025113197000030.tif1725

[0032] In salt (I), X 1 The salt in which is *-CO-O- (the salt represented by formula (I1-2) or formula (I2-2)) can be produced, for example, by reacting the salt represented by formula (I2-a) with carbonyldiimidazole in a solvent and then further reacting with the compound represented by formula (I2-b1) or the compound represented by formula (I2-b2). TIFF2025113197000031.tif71165 (In the formula, all symbols have the same meanings as described above.) Examples of the solvent in this reaction include chloroform, acetonitrile, etc. The reaction temperature is usually 5°C to 80°C, and the reaction time is usually 0.5 hour to 24 hours. Examples of the salt represented by formula (I2-a) include salts represented by the following formula etc., and they can be easily obtained on the market and can also be easily produced by known production methods. TIFF2025113197000032.tif52164

[0033] Examples of the compound represented by formula (I1-b2) include compounds represented by the following formula etc., and they are easily available on the market. TIFF2025113197000033.tif2359 Examples of the compound represented by formula (I2-b2) include compounds represented by the following formula etc., and they are easily available on the market. TIFF2025113197000034.tif1721

[0034] In salt (I), X 1The salt represented by *-O-CO-O- (the salt represented by formula (I1-3) or formula (I2-3)) can be produced, for example, by reacting a compound represented by formula (I2-b1) or a compound represented by formula (I2-b2) with carbonyldiimidazole in a solvent and then further reacting with the salt represented by formula (I1-a). TIFF2025113197000035.tif66163 (In the formula, all symbols have the same meanings as described above.) Examples of the solvent in this reaction include chloroform, acetonitrile, and the like. The reaction temperature is usually 5°C to 80°C, and the reaction time is usually 0.5 hour to 24 hours.

[0035] In salt (I), X 1 The salt represented by -O- (the salt represented by formula (I1-4) or formula (I2-4)) can be produced, for example, by reacting a compound represented by formula (I2-b1) or a compound represented by formula (I2-b2) with the salt represented by formula (I1-a) in a solvent in the presence of a base. TIFF2025113197000036.tif67158 (In the formula, all symbols have the same meanings as described above.) Examples of the base in this reaction include potassium hydroxide and the like. Examples of the solvent in this reaction include chloroform, acetonitrile, and the like. The reaction temperature is usually 5°C to 80°C, and the reaction time is usually 0.5 hour to 24 hours.

[0036] [Structural unit derived from the salt represented by formula (I)] The structural units derived from the salt represented by formula (I1) and the salt represented by formula (I2) of the present invention are the structural unit represented by the following formula (IP1) (hereinafter sometimes referred to as "structural unit (IP1)") and the structural unit represented by formula (IP2) (hereinafter sometimes referred to as "structural unit (IP2)"). The structural unit (IP1) and the structural unit (IP2) together may be referred to as the structural unit (IP). TIFF2025113197000037.tif48165[In Formula (IP1) and Formula (IP2), all the symbols have the same meanings as described above respectively.] The structural unit (IP) is CH2=C-R contained in the salt (I). 5 It shows the state where the double bond of is cleaved. Such a structural unit (IP) functions as an acid generator as well as the salt (I), and also functions as a structural unit constituting a compound or a resin.

[0037] [Resin containing the structural unit (IP) derived from the salt (I)] The resin of the present invention is a resin containing the structural unit (IP) (hereinafter sometimes referred to as "resin (Ap)"). The resin (Ap) may be a homopolymer containing one kind of structural unit (IP), or a copolymer containing two or more kinds of structural units (IP). Further, the resin (Ap) may contain structural units other than the structural unit (IP). Examples of the structural units other than the structural unit (IP) include a structural unit having an acid-labile group (hereinafter sometimes referred to as "structural unit (a1)") and structural units other than the structural unit (a1) as described later. Examples of the structural units other than the structural unit (a1) include a structural unit having no acid-labile group (hereinafter sometimes referred to as "structural unit (s)"), and other structural units known in the art. Here, the "acid-labile group" has a leaving group, and upon contact with an acid, the leaving group leaves, converting the constitutional unit into a constitutional unit having a hydrophilic group (for example, a hydroxy group or a carboxy group). The content of the structural unit (IP) is 0.1 mol% or more, preferably 0.5 mol% or more, more preferably 0.8 mol% or more, and still more preferably 1 mol% or more with respect to all the structural units of the resin (Ap). Also, it is 100 mol% or less, preferably 50 mol% or less, more preferably 30 mol% or less, and still more preferably 10 mol% or less. Specifically, it is 0.1 to 100 mol%, preferably 0.5 to 50 mol%, more preferably 0.8 to 30 mol%, and still more preferably 1 to 10 mol%.

[0038] In particular, when the resin (Ap) is used in a resist composition as described below, in addition to the structural unit (IP), it may further contain a structural unit (a1). Also, when the resin (Ap) is used in a resist composition as described below, regardless of whether it contains the structural unit (a1), it may be used in combination with a resin containing the structural unit (a1) (hereinafter sometimes referred to as "resin (A)") and / or a resin other than the resin (A). Hereinafter, the resin (Ap) and / or the resin (A) may sometimes be referred to as "resin (A) etc.". The resin (Ap) and the resin (A) preferably further contain structural units other than the structural unit (a1), respectively.

[0039] 〈Structural unit (a1)〉 The structural unit (a1) is derived from a monomer having an acid-labile group (hereinafter sometimes referred to as "monomer (a1)"). The acid-labile groups contained in the resin (A) etc. are preferably a group represented by formula (1) (hereinafter also referred to as group (1)) and / or a group represented by formula (2) (hereinafter also referred to as group (2)). TIFF2025113197000038.tif2298 [In formula (1), R a1 , R a2 and R a3 each independently represents an alkyl group having 1 to 8 carbon atoms, an alkenyl group having 2 to 8 carbon atoms, an alicyclic hydrocarbon group having 3 to 20 carbon atoms, an aromatic hydrocarbon group having 6 to 18 carbon atoms, or a group combining these, or R a1 and R a2 are bonded to each other to form an alicyclic hydrocarbon group having 3 to 20 carbon atoms together with the carbon atom to which they are bonded, and the alkyl group, the alkenyl group, the alicyclic hydrocarbon group, and the aromatic hydrocarbon group may have a halogen atom. ma and na each independently represent 0 or 1, and at least one of ma and na represents 1. * represents a bonding site. ] TIFF2025113197000039.tif2278 [In formula (2), R a1’ and R a2’each independently represents a hydrogen atom or a hydrocarbon group having 1 to 12 carbon atoms, R a3’ represents a hydrocarbon group having 1 to 20 carbon atoms, or R a2’ and R a3’ are bonded to each other to form a heterocyclic group having 3 to 20 carbon atoms together with the carbon atom to which they are bonded and X, and the -CH2- contained in the hydrocarbon group and the heterocyclic group may be replaced by -O- or -S-, and the hydrocarbon group and the heterocyclic group may have a halogen atom. X represents an oxygen atom or a sulfur atom. na’ represents 0 or 1. * represents a bonding site.]

[0040] R a1 , R a2 and R a3 Examples of the alkyl group in R R a1 , R a2 and R a3 include a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group, a heptyl group, an octyl group and the like. R a1 , R a2 and R a3 Examples of the alicyclic hydrocarbon group in R a1 , R a2 and R a3 may be either monocyclic or polycyclic. Examples of the monocyclic alicyclic hydrocarbon group include cycloalkyl groups such as a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, and a cyclooctyl group. Examples of the polycyclic alicyclic hydrocarbon group include a decahydronaphthyl group, an adamantyl group, a norbornyl group and the following group (* represents a bonding site.). The number of carbon atoms of the alicyclic hydrocarbon group of R TIFF2025113197000040.tif10159R a1 , R a2 and R a3Examples of the aromatic hydrocarbon group include aryl groups such as phenyl group, naphthyl group, anthryl group, biphenyl group, and phenanthryl group. Examples of the combined group include a group formed by combining the above-described alkyl group and alicyclic hydrocarbon group (for example, alkylcycloalkyl groups or cycloalkylalkyl groups such as methylcyclohexyl group, dimethylcyclohexyl group, methylnorbornil group, cyclohexylmethyl group, adamantylmethyl group, adamantyldimethyl group, norbornylethyl group, etc.), aralkyl groups such as benzyl group, aromatic hydrocarbon groups having an alkyl group (p-methylphenyl group, p-tert-butylphenyl group, tolyl group, xylyl group, cumenyl group, mesityl group, 2,6-diethylphenyl group, 2-methyl-6-ethylphenyl group, etc.), aromatic hydrocarbon groups having an alicyclic hydrocarbon group (p-cyclohexylphenyl group, p-adamantylphenyl group, etc.), aryl-cycloalkyl groups such as phenylcyclohexyl group, etc. Preferably, ma is 0 and na is 1. R a1 and R a2 When R and R are bonded to each other to form an alicyclic hydrocarbon group, examples of -C(R a1 )(R a2 )(R a3 ) include the following groups. The alicyclic hydrocarbon group preferably has 3 to 12 carbon atoms. * represents the bonding site with -O-. TIFF2025113197000041.tif28139

[0041] R a1’ 、R a2’ and R a3’ Examples of the hydrocarbon group in R, R, and R include alkyl groups, alicyclic hydrocarbon groups, aromatic hydrocarbon groups, and groups formed by combining these. The alkyl group, alicyclic hydrocarbon group, aromatic hydrocarbon group, and the group formed by combining these are the same as the groups exemplified for R, R, and R. a1 、R a2 and R a3 R a2’ and R a3’When they are bonded to each other to form a heterocyclic group together with the carbon atom to which they are bonded and X, -C(R a1’ )(R a2’ )-X-R a3’ includes the following groups. * represents the bonding site. TIFF2025113197000042.tif19124R a1’ and R a2’ Among them, at least one is preferably a hydrogen atom. na’ is preferably 0. R a1 、R a2 、R a3 、R a1 、R a2’ and R a3’ The halogen atom that may be possessed by may include a fluorine atom, a chlorine atom, a bromine atom or an iodine atom.

[0042] Examples of the group (1) include the following groups. In formula (1), R a1 、R a2 and R a3 are alkyl groups, ma = 0, and na = 1. The tert-butoxycarbonyl group is preferred as the group. In formula (1), R a1 、R a2 together with the carbon atom to which they are bonded form an adamantyl group, R a3 is an alkyl group, ma = 0, and na = 1. In formula (1), R a1 and R a2 are each independently an alkyl group, R a3 is an adamantyl group, ma = 0, and na = 1. Specific examples of the group (1) include the following groups. * represents the bonding site. TIFF2025113197000043.tif151166

[0043] Specific examples of the group (2) include the following groups. * represents the bonding site. TIFF2025113197000044.tif55153

[0044] Monomer (a1) is preferably a monomer having an acid-labile group and an ethylenically unsaturated bond, more preferably a (meth)acrylic monomer having an acid-labile group. Among the (meth)acrylic monomers having an acid-labile group, those having an alicyclic hydrocarbon group with 5 to 20 carbon atoms are preferable. If a resin (A) or the like having a structural unit derived from monomer (a1) having a bulky structure such as an alicyclic hydrocarbon group is used in the resist composition, the resolution of the resist pattern can be improved.

[0045] As the structural unit derived from the (meth)acrylic monomer having group (1), there may be mentioned a structural unit represented by formula (a1-0) (hereinafter sometimes referred to as structural unit (a1-0)), a structural unit represented by formula (a1-1) (hereinafter sometimes referred to as structural unit (a1-1)), or a structural unit represented by formula (a1-2) (hereinafter sometimes referred to as structural unit (a1-2)). Preferably, it is at least one structural unit selected from the group consisting of structural unit (a1-0), structural unit (a1-1), and structural unit (a1-2), more preferably at least one or two structural units selected from the group consisting of structural unit (a1-1) and structural unit (a1-2). These may be used alone or in combination of two or more. TIFF2025113197000045.tif46149[In formula (a1-0), formula (a1-1), and formula (a1-2), L a01 、L a1 and L a2 each independently represents -O- or *-O-(CH2) k1 -CO-O-, k1 represents an integer of 1 to 7, and * represents the bonding site with -CO-. R a01 、R a4 and R a5 each independently represents a hydrogen atom, a halogen atom, or an alkyl group having 1 to 6 carbon atoms which may have a halogen atom. Ra02 and R a03 and R a04 each independently represents an alkyl group having 1 to 8 carbon atoms, an alicyclic hydrocarbon group having 3 to 18 carbon atoms, an aromatic hydrocarbon group having 6 to 18 carbon atoms, or a group formed by combining these, and the alkyl group, the alicyclic hydrocarbon group, and the aromatic hydrocarbon group may have a halogen atom. R a6 and R a7 each independently represents an alkyl group having 1 to 8 carbon atoms, an alkenyl group having 2 to 8 carbon atoms, an alicyclic hydrocarbon group having 3 to 18 carbon atoms, an aromatic hydrocarbon group having 6 to 18 carbon atoms, or a group formed by combining these, and the alkyl group, the alkenyl group, the alicyclic hydrocarbon group, and the aromatic hydrocarbon group may have a halogen atom. m1 represents any integer from 0 to 14. n1 represents any integer from 0 to 10. n1’ represents any integer from 0 to 3.

[0046] R a01 and R a4 and R a5 Examples of the halogen atom in R, R, and R include a fluorine atom, a chlorine atom, a bromine atom, or an iodine atom. R a01 and R a4 and R a5Examples of the alkyl group which may have a halogen atom include chloromethyl group, bromomethyl group, iodomethyl group, trifluoromethyl group, difluoromethyl group, methyl group, perfluoroethyl group, 2,2,2-trifluoroethyl group, 1,1,2,2-tetrafluoroethyl group, ethyl group, perfluoropropyl group, 2,2,3,3,3-pentafluoropropyl group, propyl group, perfluorobutyl group, 1,1,2,2,3,3,4,4-octafluorobutyl group, butyl group, perfluoropentyl group, 2,2,3,3,4,4,5,5,5-nonafluoropentyl group, pentyl group, hexyl group, and perfluorohexyl group. The number of carbon atoms of the alkyl group is preferably 1 to 4, more preferably 1 to 3, and even more preferably 1 or 2. The alkyl group is preferably a methyl group or an ethyl group, and more preferably a methyl group. R a01 , R a4 and R a5 are preferably a hydrogen atom or a methyl group, and more preferably a methyl group. L a01 , L a1 and L a2 are preferably an oxygen atom or *-O-(CH2) k01 -CO-O- (wherein k01 is preferably any integer from 1 to 4, and more preferably 1), and more preferably an oxygen atom. R a02 , R a03 , R a04 , R a6 and R a7 Examples of the alkyl group, alkenyl group, alicyclic hydrocarbon group, aromatic hydrocarbon group, and the group formed by combining these in R a1 , R a2 and R a3 are the same as those exemplified for the groups represented by R R a02 , R a03 and R a04 The alkyl group in R R a6 and Ra7 The alkyl group in a7 is preferably an alkyl group having 1 to 6 carbon atoms, more preferably a methyl group, an ethyl group, an isopropyl group or a t-butyl group, and still more preferably an ethyl group, an isopropyl group or a t-butyl group. R a6 and R a7 The alkenyl group in a7 is preferably an alkenyl group having 2 to 6 carbon atoms, more preferably an ethenyl group, a propenyl group, an isopropenyl group or a butenyl group. R a02 、R a03 、R a04 、R a6 and R a7 The number of carbon atoms of the alicyclic hydrocarbon group of a7 is preferably 5 to 12, more preferably 5 to 10. R a02 、R a03 、R a04 、R a6 and R a7 The number of carbon atoms of the aromatic hydrocarbon group of a7 is preferably 6 to 12, more preferably 6 to 10. For the group combining an alkyl group and an alicyclic hydrocarbon group, it is preferable that the total number of carbon atoms of these alkyl group and alicyclic hydrocarbon group is 18 or less. For the group combining an alkyl group and an aromatic hydrocarbon group, it is preferable that the total number of carbon atoms of these alkyl group and aromatic hydrocarbon group is 18 or less. R a02 and R a03 are preferably an alkyl group having 1 to 6 carbon atoms which may have a halogen atom or an aromatic hydrocarbon group having 6 to 12 carbon atoms which may have a halogen atom, more preferably a methyl group, an ethyl group, a phenyl group or a naphthyl group which may have a halogen atom. R a04 is preferably an alkyl group having 1 to 6 carbon atoms which may have a halogen atom or an alicyclic hydrocarbon group having 5 to 12 carbon atoms which may have a halogen atom, more preferably a methyl group, an ethyl group, a cyclohexyl group or an adamantyl group which may have a halogen atom. R a6 and R a7is an alkyl group having 1 to 6 carbon atoms which may preferably have a halogen atom, an alkenyl group having 2 to 6 carbon atoms which may have a halogen atom, or an aromatic hydrocarbon group having 6 to 12 carbon atoms which may have a halogen atom, more preferably a methyl group, an ethyl group, an isopropyl group, a t-butyl group, an ethenyl group, a phenyl group or a naphthyl group which may have a halogen atom, and still more preferably an ethyl group, an isopropyl group, a t-butyl group, an ethenyl group or a phenyl group which may have a halogen atom. m1 is preferably any integer from 0 to 3, more preferably 0 or 1. n1 is preferably any integer from 0 to 3, more preferably 0 or 1. n1’ is preferably 0 or 1.

[0047] Examples of the structural unit (a1-0) include structural units represented by any of the formulas (a1-0-1) to (a1-0-24) and structural units in which the methyl group corresponding to R in the structural unit (a1-0) is replaced with a hydrogen atom, a halogen atom, a haloalkyl group (an alkyl group having a halogen atom) or another alkyl group, and structural units represented by any of the formulas (a1-0-1) to (a1-0-10), formula (a1-0-13), formula (a1-0-14), and formulas (a1-0-19) to (a1-0-24) are preferred. a01 Examples of the structural unit (a1-1) include structural units derived from the monomers described in JP-A-2010-204646. Among them, structural units represented by any of the formulas (a1-1-1) to (a1-1-7) and structural units in which the methyl group corresponding to R in the structural unit (a1-1) is replaced with a hydrogen atom, a halogen atom, a haloalkyl group or another alkyl group are preferred, and structural units represented by any of the formulas (a1-1-1) to (a1-1-4) are more preferred. TIFF2025113197000046.tif120160

[0048] Examples of the structural unit (a1-1) include structural units derived from the monomers described in JP-A-2010-204646. Among them, structural units represented by any of the formulas (a1-1-1) to (a1-1-7) and structural units in which the methyl group corresponding to R in the structural unit (a1-1) is replaced with a hydrogen atom, a halogen atom, a haloalkyl group or another alkyl group are preferred, and structural units represented by any of the formulas (a1-1-1) to (a1-1-4) are more preferred. a4 Examples of the structural unit (a1-1) include structural units derived from the monomers described in JP-A-2010-204646. Among them, structural units represented by any of the formulas (a1-1-1) to (a1-1-7) and structural units in which the methyl group corresponding to R in the structural unit (a1-1) is replaced with a hydrogen atom, a halogen atom, a haloalkyl group or another alkyl group are preferred, and structural units represented by any of the formulas (a1-1-1) to (a1-1-4) are more preferred. TIFF2025113197000047.tif35170

[0049] Examples of the structural unit (a1-2) include a structural unit represented by any of formulae (a1-2-1) to (a1-2-20) and a structural unit in which the methyl group corresponding to R in the structural unit (a1-2) is replaced with a hydrogen atom, a halogen atom, a haloalkyl group or another alkyl group, and a structural unit represented by any of formula (a1-2-2), formula (a1-2-5), formula (a1-2-6) and formulae (a1-2-10) to (a1-2-20) is preferred. a5 Examples of the structural unit (a1-2) include a structural unit represented by any of formulae (a1-2-1) to (a1-2-20) and a structural unit in which the methyl group corresponding to R in the structural unit (a1-2) is replaced with a hydrogen atom, a halogen atom, a haloalkyl group or another alkyl group, and a structural unit represented by any of formula (a1-2-2), formula (a1-2-5), formula (a1-2-6) and formulae (a1-2-10) to (a1-2-20) is preferred. TIFF2025113197000048.tif92164

[0050] When the resin (A) or the like contains the structural unit (a1-0) and / or the structural unit (a1-1) and / or the structural unit (a1-2), the total content thereof is 10 mol% or more, preferably 15 mol% or more, more preferably 20 mol% or more, still more preferably 25 mol% or more, even more preferably 30 mol% or more, still even more preferably 40 mol% or more, and even more preferably 50 mol% or more, based on all the structural units of the resin (A) or the like. Further, it is 95 mol% or less, preferably 90 mol% or less, more preferably 85 mol% or less, still more preferably 70 mol% or less, and even more preferably 65 mol% or less. Specifically, it is 10 to 95 mol%, preferably 15 to 90 mol%, more preferably 20 to 85 mol%, still more preferably 25 to 70 mol%, and even more preferably 30 to 70 mol%. When the resin (A) etc. contains the structural unit (a1-0), the content rate thereof is 5 mol% or more, preferably 10 mol% or more, more preferably 15 mol% or more, still more preferably 20 mol% or more, even more preferably 25 mol% or more, still even more preferably 30 mol% or more, and even more preferably 35 mol% or more, with respect to all the structural units of the resin (A) etc. Also, 80 mol% or less is mentioned, preferably 75 mol% or less, more preferably 70 mol% or less, still more preferably 65 mol% or less, even more preferably 60 mol% or less. Specifically, 5 to 80 mol% is mentioned, preferably 5 to 75 mol%, and more preferably 10 to 70 mol%. When the resin (A) etc. contains the structural unit (a1-1) and / or the structural unit (a1-2), the total content rate thereof is 10 mol% or more, preferably 15 mol% or more, more preferably 20 mol% or more, still more preferably 25 mol% or more, even more preferably 30 mol% or more, still even more preferably 40 mol% or more, and even more preferably 50 mol% or more, with respect to all the structural units of the resin (A) etc. Also, 95 mol% or less is mentioned, preferably 90 mol% or less, more preferably 85 mol% or less, still more preferably 80 mol% or less, even more preferably 75 mol% or less, still even more preferably 70 mol% or less, and even more preferably 65 mol% or less. Specifically, 10 to 90 mol% is mentioned, preferably 15 to 85 mol%, more preferably 15 to 80 mol%, still more preferably 20 to 80 mol%, even more preferably 20 to 75 mol%, still even more preferably 20 to 70 mol%, more preferably 20 to 60 mol%, and even more preferably 20 to 55 mol%.

[0051] Examples of the structural unit having the group (2) in the structural unit (a1) include the structural unit represented by the formula (a1-4) (hereinafter, may be referred to as "structural unit (a1-4)"). TIFF2025113197000049.tif31119[In the formula (a1-4), Ra1 represents a hydrogen atom, a halogen atom, or an alkyl group having 1 to 6 carbon atoms which may have a halogen atom. R a17 represents a halogen atom, a hydroxy group, a carboxy group, an alkyl group having 1 to 6 carbon atoms which may have a halogen atom, an alkoxy group having 1 to 6 carbon atoms, an alkoxyalkyl group having 2 to 12 carbon atoms, an alkoxyalkoxy group having 2 to 12 carbon atoms, an alkylcarbonyl group having 2 to 4 carbon atoms, an alkylcarbonyloxy group having 2 to 4 carbon atoms, an acryloyloxy group or a methacryloyloxy group. A a11 represents a single bond or an alkanediyl group having 1 to 12 carbon atoms, and -CH2- contained in the alkanediyl group may be replaced by -O-, -CO- or -NR a18 -. R a18 represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms. X a1 represents a single bond or a carbonyl group. R a34 and R a35 each independently represents a hydrogen atom or a hydrocarbon group having 1 to 12 carbon atoms, R a36 represents a hydrocarbon group having 1 to 20 carbon atoms, or R a35 and R a36 are bonded to each other to form a divalent hydrocarbon group having 2 to 20 carbon atoms together with the -C-O- to which they are bonded, and -CH2- contained in the hydrocarbon group and the divalent hydrocarbon group may be replaced by -O- or -S-. na1 represents any integer from 1 to 5, and when na1 is 2 or more, the groups in the plurality of parentheses may be the same as or different from each other. na11 represents any integer from 0 to 4, and when na11 is 2 or more, the plurality of R a17 may be the same as or different from each other. mc represents any integer from 0 to 2.

[0052] R a1 and R a17Examples of the halogen atom and the alkyl group having 1 to 6 carbon atoms which may have a halogen atom include R of formula (a1-0). a01 Examples thereof include the same as those exemplified above. R a1 is preferably a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, more preferably a hydrogen atom, a methyl group or an ethyl group, and even more preferably a hydrogen atom or a methyl group. R a17 Examples of the alkoxy group in R include a methoxy group, an ethoxy group, a propoxy group, an isopropoxy group, a butoxy group, a sec-butoxy group, a tert-butoxy group, a pentyloxy group, and a hexyloxy group. The alkoxy group is preferably an alkoxy group having 1 to 4 carbon atoms, more preferably an alkoxy group having 1 to 3 carbon atoms, even more preferably a methoxy group or an ethoxy group, and even more preferably a methoxy group. R a17 Examples of the alkoxyalkyl group in R include a methoxymethyl group, an ethoxyethyl group, a propoxymethyl group, an isopropoxymethyl group, a butoxymethyl group, a sec-butoxymethyl group, and a tert-butoxymethyl group. The alkoxyalkyl group is preferably an alkoxyalkyl group having 2 to 8 carbon atoms, more preferably an alkoxyalkyl group having 2 to 4 carbon atoms, even more preferably a methoxymethyl group or an ethoxyethyl group, and even more preferably a methoxymethyl group. R a17 Examples of the alkoxyalkoxy group in R include a methoxymethoxy group, a methoxyethoxy group, an ethoxymethoxy group, an ethoxyethoxy group, a propoxymethoxy group, an isopropoxymethoxy group, a butoxymethoxy group, a sec-butoxymethoxy group, and a tert-butoxymethoxy group. The alkoxyalkoxy group is preferably an alkoxyalkoxy group having 2 to 8 carbon atoms, more preferably an alkoxyalkoxy group having 2 to 4 carbon atoms, and even more preferably a methoxyethoxy group or an ethoxyethoxy group. R a17Examples of the alkylcarbonyl group in [description] include an acetyl group, a propionyl group, a butyryl group, etc. The alkylcarbonyl group is preferably an alkylcarbonyl group having 2 to 4 carbon atoms, more preferably an alkylcarbonyl group having 2 to 3 carbon atoms, and even more preferably an acetyl group. R a17 Examples of the alkylcarbonyloxy group in [description] include an acetyloxy group, a propionyloxy group, and a butyryloxy group. The alkylcarbonyloxy group is preferably an alkylcarbonyloxy group having 2 to 4 carbon atoms, more preferably an alkylcarbonyloxy group having 2 to 3 carbon atoms, and even more preferably an acetyloxy group. R a17 is preferably a halogen atom, a hydroxy group, a carboxy group, an optionally halogenated alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, or an alkoxyalkoxy group having 2 to 8 carbon atoms, more preferably a fluorine atom, an iodine atom, a hydroxy group, a methyl group, a methoxy group, an ethoxy group, an ethoxyethoxy group, or an ethoxymethoxy group, and even more preferably a fluorine atom, an iodine atom, a hydroxy group, a methyl group, a methoxy group, or an ethoxyethoxy group.

[0053] A a11Examples of the alkanediyl group include linear alkanediyl groups such as methylene group, ethylene group, propane-1,3-diyl group, propane-1,2-diyl group, butane-1,4-diyl group, pentane-1,5-diyl group, hexane-1,6-diyl group, heptane-1,7-diyl group, octane-1,8-diyl group, nonane-1,9-diyl group, decane-1,10-diyl group, undecane-1,11-diyl group, dodecane-1,12-diyl group, and branched alkanediyl groups such as butane-1,3-diyl group, 2-methylpropane-1,3-diyl group, 2-methylpropane-1,2-diyl group, pentane-1,4-diyl group, 2-methylbutane-1,4-diyl group, heptane-1,6-diyl group, octane-1,7-diyl group, nonane-1,8-diyl group, decane-1,9-diyl group, undecane-1,10-diyl group. The number of carbon atoms in the alkanediyl group is preferably 1 to 10, more preferably 1 to 8, still more preferably 1 to 6, even more preferably 1 to 4, still even more preferably 1 to 3, and even more preferably 1 or 2. R a18 Examples of the alkyl group include methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, and tert-butyl group. A a11 When -CH2- contained in the alkanediyl group of A is replaced by -O-, -CO- or -NR a18 -, the number of carbon atoms before replacement is regarded as the number of carbon atoms of the alkanediyl group. A a11 Examples of the group in which -CH2- contained in the alkanediyl group of A is replaced by -O-, -CO- or -NR a18 - include hydroxy group, carboxy group, carbonyl group, oxy group, amino group, alkoxy group, alkoxycarbonyl group, alkylcarbonyl group, alkylamino group, peptide group, alkanediyl-oxy group, alkanediyl-oxycarbonyl group, alkanediyl-carbonyl group, alkanediyl-carbonyl-oxy group, alkanediyl-sulfonyl group, alkanediyl-thio group, alkanediyl-amino group, etc. These replaced groups include those similar to those exemplified in this specification as long as the upper limit of the number of carbon atoms permits. For example, A a11 The -CH2- contained in the alkanediyl group of may be replaced by -O-, -CO- or -NR a18 The groups replaced by - are *-O-, *-CO-O-, *-O-CO-, *-CO-O-A a12 -CO-O-, *-O-CO-A a12 -O-, *-O-A a12 -CO-O-, *-CO-O-A a12 -O-CO-, *-O-CO-A a12 -O-CO-, *-CO-NR a18 - are mentioned. Among them, *-CO-O-, *-CO-O-A a12 -CO-O-, *-O-A a12 -CO-O-, *-CO-NR a18 - are preferred. Here, A a12 represents an alkanediyl group having 1 to 8 carbon atoms, and * represents the bonding site with the carbon atom to which R a1 is bonded. The alkanediyl group of A a12 includes alkanediyl groups similar to A a11 within the range allowed by the upper limit of the number of carbon atoms. A a11 is preferably a single bond, *-CO-O- or *-CO-O-A a12 -CO-O-, more preferably a single bond, *-CO-O- or *-CO-O-CH2-CO-O-, and even more preferably a single bond or *-CO-O-. na1 is preferably 1, 2, 3 or 4, more preferably 1, 2 or 3, and even more preferably 1 or 2. na11 is preferably 0, 1, 2 or 3, more preferably 0, 1 or 2, and even more preferably 0 or 1. mc is preferably 0 or 1.

[0054] R a34 R a35 R a36 The hydrocarbon groups in and include alkyl groups, alicyclic hydrocarbon groups, aromatic hydrocarbon groups, and groups combining these. Examples of the alkyl group include a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group, a heptyl group, an octyl group, and the like. The alicyclic hydrocarbon group may be either monocyclic or polycyclic. Examples of the monocyclic alicyclic hydrocarbon group include cycloalkyl groups such as a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, and a cyclooctyl group. Examples of the polycyclic alicyclic hydrocarbon group include a decahydronaphthyl group, an adamantyl group, a norbornyl group, and the following group (* represents a bonding site). Examples of the aromatic hydrocarbon group include aryl groups such as a phenyl group, a naphthyl group, an anthryl group, a biphenyl group, and a phenanthryl group. Examples of the combined group include a group formed by combining the above-described alkyl group and alicyclic hydrocarbon group (for example, an alkylcycloalkyl group or cycloalkylalkyl group such as a methylcyclohexyl group, a dimethylcyclohexyl group, a methylnorbornyl group, a cyclohexylmethyl group, an adamantylmethyl group, an adamantyldimethyl group, and a norbornylethyl group), an aralkyl group such as a benzyl group, an aromatic hydrocarbon group having an alkyl group (a p-methylphenyl group, a p-tert-butylphenyl group, a tolyl group, a xylyl group, a cumenyl group, a mesityl group, a 2,6-diethylphenyl group, a 2-methyl-6-ethylphenyl group, etc.), an aromatic hydrocarbon group having an alicyclic hydrocarbon group (a p-cyclohexylphenyl group, a p-adamantylphenyl group, etc.), an aryl-cycloalkyl group such as a phenylcyclohexyl group, and the like. In particular, R a36 Examples of R include an alkyl group having 1 to 18 carbon atoms, an alicyclic hydrocarbon group having 3 to 18 carbon atoms, an aromatic hydrocarbon group having 6 to 18 carbon atoms, or a group formed by combining these. R a35 and R a36 Examples of the divalent hydrocarbon group having 2 to 20 carbon atoms formed by R and R bonding to each other together with the -C-O- to which they are bonded include the following groups. * represents a bonding site, and one is the bonding site with R a34 and the other is the bonding site with R. TIFF2025113197000051.tif15105

[0055] R a34 is preferably a hydrogen atom. R a35 is preferably a hydrogen atom, an alkyl group having 1 to 12 carbon atoms or an alicyclic hydrocarbon group having 3 to 12 carbon atoms, more preferably a methyl group or an ethyl group. R a36 The hydrocarbon group of is preferably an alkyl group having 1 to 18 carbon atoms, an alicyclic hydrocarbon group having 3 to 18 carbon atoms, an aromatic hydrocarbon group having 6 to 18 carbon atoms or a group formed by combining these, more preferably an alkyl group having 1 to 18 carbon atoms, an alicyclic hydrocarbon group having 3 to 18 carbon atoms or an aralkyl group having 7 to 18 carbon atoms. R a36 The alkyl group and the alicyclic hydrocarbon group in are preferably unsubstituted. R a36 The aromatic hydrocarbon group in preferably has an aromatic ring having an aryloxy group having 6 to 10 carbon atoms.

[0056] -O-C(R a34 )(R a35 )-O-R a36 is eliminated by contact with an acid (for example, p-toluenesulfonic acid) to form a hydroxy group or a carboxy group. -X a1 -O-C(R a34 )(R a35 )-O-R a36 In the case of a benzene ring, it may be bonded to any of the o-position, m-position or p-position with respect to the bonding position of A a11 . Among them, it is preferable that at least one is bonded to the o-position or p-position, and more preferably bonded to the p-position. In the case of a naphthalene ring, when the bonding position of A a11 is at the 1-position, it may be bonded to any of the 2-position to 8-position, and when the bonding position of A a11 is at the 2-position, it may be bonded to any of the 1-position and the 3-position to 8-position. Among them, when the bonding position of A a11 is at the 1-position, it is preferable that at least one is bonded to the 3-position to 6-position, and more preferably bonded to the 3-position or 4-position. A a11When the bonding position is the 2nd position, it is preferably bonded to the 4th to 7th positions, and more preferably bonded to the 5th or 6th position.

[0057] Examples of the structural unit (a1-4) include structural units derived from monomers described in JP-A-2010-204646. Preferably, the structural units represented by Formulae (a1-4-1) to (a1-4-42) and R in the structural unit (a1-4) a1 Examples of the structural unit in which the hydrogen atom corresponding to is replaced with a halogen atom, a haloalkyl group or an alkyl group include, more preferably, the structural units represented by Formulae (a1-4-1) to (a1-4-5), Formula (a1-4-10), Formula (a1-4-13), Formula (a1-4-14), Formula (a1-4-19), and Formula (a1-4-20). TIFF2025113197000052.tif228165

[0058] When the resin (A) or the like contains the structural unit (a1-4), the content thereof is 10 mol% or more, preferably 15 mol% or more, more preferably 20 mol% or more, still more preferably 25 mol% or more, even more preferably 30 mol% or more, still even more preferably 40 mol% or more, and even more preferably 50 mol% or more with respect to the total of all the structural units of the resin (A) or the like. Further, 95 mol% or less is mentioned, preferably 90 mol% or less, more preferably 85 mol% or less, still more preferably 80 mol% or less, even more preferably 75 mol% or less, still even more preferably 70 mol% or less, and even more preferably 65 mol% or less. Specifically, it is preferably 10 to 95 mol%, more preferably 15 to 90 mol%, still more preferably 20 to 85 mol%, even more preferably 20 to 70 mol%, and still even more preferably 20 to 60 mol%.

[0059] Examples of the structural unit derived from the (meth)acrylic monomer having the group (2) also include the structural unit represented by the formula (a1-5) (hereinafter sometimes referred to as "structural unit (a1-5)"). TIFF2025113197000053.tif4558[In formula (a1-5), R a8 represents an alkyl group having 1 to 6 carbon atoms which may have a halogen atom, a hydrogen atom or a halogen atom. Z a1 represents a single bond or *-(CH2) h3 -CO-L 54 -, h3 represents an integer of any one of 1 to 4, and * represents the bonding site with L 51 . L 51 , L 52 , L 53 and L 54 each independently represents -O- or -S-. s1 represents an integer of any one of 1 to 3. s1’ represents an integer of any one of 0 to 3.]

[0060] R a8 Examples of the halogen atom and the alkyl group having 1 to 6 carbon atoms which may have a halogen atom in R are the same as those exemplified by R in formula (a1-0), formula (a1-1) and formula (a1-2). a01 R a4 and R a5 in. In formula (a1-5), R a8 is preferably a hydrogen atom, a methyl group or a trifluoromethyl group. L 51 is preferably an oxygen atom. L 52 and L 53 Among them, it is preferable that one is -O- and the other is -S-. s1 is preferably 1. s1’ is preferably an integer of any one of 0 to 2. Z a1 is preferably a single bond or *-CH2-CO-O-.

[0061] Examples of the structural unit (a1-5) include structural units derived from monomers described in JP-A-2010-61117. Among them, the structural units represented by formula (a1-5-1) to formula (a1-5-4) are preferable, and the structural unit represented by formula (a1-5-1) or formula (a1-5-2) is more preferable. TIFF2025113197000054.tif31130When the resin (A) or the like contains the structural unit (a1-5), the content thereof is 1 mol% or more, preferably 2 mol% or more, more preferably 3 mol% or more, still more preferably 5 mol% or more, even more preferably 10 mol% or more, still even more preferably 20 mol% or more, and even more preferably 25 mol% or more, based on all the structural units of the resin (A) or the like. Also, it is 80 mol% or less, preferably 70 mol% or less, more preferably 60 mol% or less, still more preferably 50 mol% or less, even more preferably 45 mol% or less, still even more preferably 40 mol% or less, and even more preferably 30 mol% or less. Specifically, 1 to 50 mol% is preferable, 3 to 45 mol% is more preferable, 5 to 40 mol% is still more preferable, and 5 to 30 mol% is even more preferable.

[0062] Examples of the structural unit having the group (1) in the structural unit (a1) include the structural unit represented by formula (a1-6) (hereinafter sometimes referred to as "structural unit (a1-6)"). TIFF2025113197000055.tif3481[In formula (a1-6), R a61 represents a hydrogen atom, a halogen atom, or an alkyl group having 1 to 6 carbon atoms which may have a halogen atom. R a62 、R a63 and R a64 each independently represent an alkyl group having 1 to 6 carbon atoms or a cyclic hydrocarbon group having 3 to 18 carbon atoms which may have a substituent, or R a62 and R a63 are bonded to each other to form a ring having 3 to 20 carbon atoms together with the carbon atom to which they are bonded. X a61represents a single bond, -CO-O-*, or -CO-NR a65 -*, where * represents the bonding site with Ar, and R a65 represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms. X a62 represents a single bond, *-O-L a61 - or *-CO-O-L a62 -, where * represents the bonding site with Ar, and L a61 and L a62 each independently represents an alkanediyl group having 1 to 4 carbon atoms. Ar represents an aromatic hydrocarbon group having 6 to 20 carbon atoms which may have a substituent.]

[0063] R a61 Examples of the halogen atom and the alkyl group having 1 to 6 carbon atoms which may have a halogen atom in R a01 are the same as those exemplified by R a4 in formula (a1-0), formula (a1-1) and formula (a1-2). a5 R a61 is preferably a hydrogen atom, a methyl group or a trifluoromethyl group. R a62 Examples of the alkyl group in R a63 , R a64 , R a65 and R include a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group and the like. The alkyl group is preferably an alkyl group having 1 to 4 carbon atoms, more preferably an alkyl group having 1 to 3 carbon atoms, and even more preferably a methyl group or an ethyl group. a62 Examples of the cyclic hydrocarbon group in R a63 and R a64 include an alicyclic hydrocarbon group and an aromatic hydrocarbon group. ​The alicyclic hydrocarbon group may be either monocyclic or polycyclic. Examples of the monocyclic alicyclic hydrocarbon group include a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cyclooctyl group, and the like. Examples of the polycyclic alicyclic hydrocarbon group include a decahydronaphthyl group, an adamantyl group, a norbornyl group, and the like. The number of carbon atoms of the alicyclic hydrocarbon group is preferably 3 to 16, more preferably 3 to 12. Examples of the aromatic hydrocarbon group include a phenylene group, a naphthylene group, and the like. Examples of the substituent that the cyclic hydrocarbon group may have include a halogen atom, a hydroxy group, an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, an alkoxyalkyl group having 2 to 12 carbon atoms, an alkoxyalkoxy group having 2 to 12 carbon atoms, an alkylcarbonyl group having 2 to 4 carbon atoms, an alkylcarbonyloxy group having 2 to 4 carbon atoms, an acryloyloxy group, or a methacryloyloxy group. R a62 and R a63 Examples of the ring formed by bonding with each other include an adamantane ring, a cyclopentane ring, a cyclohexane ring, and the like. Specifically, when R a62 and R a63 bond with each other to form a ring, examples of -C(R a62 )(R a63 )(R a64 ) include the following groups. * represents the bonding site with the oxygen atom. The number of carbon atoms of the ring is preferably 3 to 16, more preferably 3 to 12. TIFF2025113197000056.tif33110

[0064] L a61 and L a62 Examples of the alkanediyl group having 1 to 4 carbon atoms in L L a61 and L a62is preferably a methylene group or an ethylene group, independently of each other. X a61 is preferably a single bond or -CO-O-*, more preferably a single bond. X a62 is preferably a single bond or *-O-L a61 -, more preferably a single bond.

[0065] Examples of the aromatic hydrocarbon group having 6 to 20 carbon atoms in Ar include a phenylene group, a naphthylene group, an anthrylene group, a biphenylene group, and a phenanthrylene group. Examples of the substituent that the aromatic hydrocarbon group may have include a halogen atom, a hydroxy group, an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, an alkoxyalkyl group having 2 to 12 carbon atoms, an alkoxyalkoxy group having 2 to 12 carbon atoms, an alkylcarbonyl group having 2 to 4 carbon atoms, an alkylcarbonyloxy group having 2 to 4 carbon atoms, an acryloyloxy group, or a methacryloyloxy group. Examples of the halogen atom include a fluorine atom, an iodine atom, a chlorine atom, and a bromine atom. Examples of the alkyl group include a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, a sec-butyl group, a tert-butyl group, a pentyl group, and a hexyl group. The alkyl group is preferably an alkyl group having 1 to 4 carbon atoms, more preferably a methyl group or an ethyl group, and even more preferably a methyl group. Examples of the alkoxy group include a methoxy group, an ethoxy group, a propoxy group, an isopropoxy group, a butoxy group, a sec-butoxy group, a tert-butoxy group, a pentyloxy group, and a hexyloxy group. The alkoxy group is preferably an alkoxy group having 1 to 4 carbon atoms, more preferably a methoxy group or an ethoxy group, and even more preferably a methoxy group. Examples of the alkoxyalkyl group include a methoxymethyl group, an ethoxyethyl group, a propoxymethyl group, an isopropoxymethyl group, a butoxymethyl group, a sec-butoxymethyl group, and a tert-butoxymethyl group. The alkoxyalkyl group is preferably an alkoxyalkyl group having 2 to 8 carbon atoms, more preferably a methoxymethyl group or an ethoxyethyl group, and even more preferably a methoxymethyl group. Examples of the alkoxyalkoxy group include a methoxymethoxy group, a methoxyethoxy group, an ethoxymethoxy group, an ethoxyethoxy group, a propoxymethoxy group, an isopropoxymethoxy group, a butoxymethoxy group, a sec-butoxymethoxy group, and a tert-butoxymethoxy group. The alkoxyalkoxy group is preferably an alkoxyalkoxy group having 2 to 8 carbon atoms, and more preferably a methoxyethoxy group or an ethoxyethoxy group. Examples of the alkylcarbonyl group include an acetyl group, a propionyl group, and a butyryl group. The alkylcarbonyl group is preferably an alkylcarbonyl group having 2 to 3 carbon atoms, and more preferably an acetyl group. Examples of the alkylcarbonyloxy group include an acetyloxy group, a propionyloxy group, and a butyryloxy group. The alkylcarbonyloxy group is preferably an alkylcarbonyloxy group having 2 to 3 carbon atoms, and more preferably an acetyloxy group. The substituent is preferably a halogen atom, a hydroxy group, an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, or an alkoxyalkoxy group having 2 to 8 carbon atoms, more preferably a fluorine atom, an iodine atom, a hydroxy group, a methyl group, a methoxy group, an ethoxy group, an ethoxyethoxy group, or an ethoxymethoxy group, and even more preferably a fluorine atom, an iodine atom, a hydroxy group, a methyl group, a methoxy group, or an ethoxyethoxy group. Ar is preferably a phenylene group which may have a substituent, and more preferably a phenylene group which may have a hydroxy group.

[0066] Examples of the structural unit (a1-6) include structural units represented by Formula (a1-6-1) to Formula (a1-6-44), etc. Structural units represented by Formula (a1-6-1) to Formula (a1-6-9) are preferred, and structural units represented by Formula (a1-6-1), Formula (a1-6-2), Formula (a1-6-4), Formula (a1-6-5), Formula (a1-6-7) or Formula (a1-6-8) are more preferred, and structural units represented by Formula (a1-6-1) or Formula (a1-6-2) are even more preferred. In the following structural units, R a61 Structural units in which the hydrogen atom corresponding to is replaced with a methyl group or the like, and structural units in which the methyl group corresponding to R a61 is replaced with a hydrogen atom in the following structural units are also included as the structural unit (a1-6). TIFF2025113197000057.tif226161

[0067] When the resin (A) etc. contains the structural unit (a1-6), the content thereof is 3 mol% or more, preferably 5 mol% or more, more preferably 7 mol% or more, even more preferably 10 mol% or more, still more preferably 20 mol% or more, still even more preferably 30 mol% or more, and even more preferably 40 mol% or more, with respect to all the structural units of the resin (A) etc. Also, 80 mol% or less is included, preferably 75 mol% or less, more preferably 70 mol% or less, even more preferably 65 mol% or less. Specifically, it is preferably 3 to 80 mol%, more preferably 5 to 75 mol%, even more preferably 7 to 70 mol%, still even more preferably 7 to 65 mol%, and particularly preferably 10 to 65 mol%.

[0068] Examples of the structural unit (a1) also include the following structural units. TIFF2025113197000058.tif33167

[0069] When resin (A) or the like contains structural units represented by formulas (a1-7-1) to (a1-7-7), the content thereof is 10 mol% or more, preferably 15 mol% or more, more preferably 20 mol% or more, still more preferably 25 mol% or more, even more preferably 30 mol% or more, yet even more preferably 40 mol% or more, and still even more preferably 50 mol% or more, based on all the structural units of resin (A) or the like. Further, it is 95 mol% or less, preferably 90 mol% or less, more preferably 85 mol% or less, still more preferably 80 mol% or less, even more preferably 75 mol% or less, yet even more preferably 70 mol% or less, and still even more preferably 60 mol% or less. Specifically, 10 to 95 mol% is preferable, 15 to 90 mol% is more preferable, 20 to 85 mol% is still more preferable, 20 to 70 mol% is still even more preferable, and 20 to 60 mol% is particularly preferable.

[0070] Further, examples of the structural unit (a1) also include the following structural units. TIFF2025113197000059.tif51121 When resin (A) or the like contains structural units represented by formulas (a1-8-1) to (a1-8-3), the content thereof is 10 mol% or more, preferably 15 mol% or more, more preferably 20 mol% or more, still more preferably 25 mol% or more, even more preferably 30 mol% or more, yet even more preferably 40 mol% or more, and still even more preferably 50 mol% or more, based on all the structural units of resin (A) or the like. Further, it is 95 mol% or less, preferably 90 mol% or less, more preferably 85 mol% or less, still more preferably 80 mol% or less, even more preferably 75 mol% or less, yet even more preferably 70 mol% or less, and still even more preferably 60 mol% or less. Specifically, 10 to 60 mol% is preferable, 15 to 55 mol% is more preferable, 20 to 50 mol% is still more preferable, 20 to 45 mol% is still even more preferable, and 20 to 40 mol% is particularly preferable.

[0071] 〈Structural unit (s)〉 The structural unit(s) is / are derived from a monomer having no acid-labile group (hereinafter sometimes referred to as "monomer(s)"). As the monomer from which the structural unit(s) is / are derived, a monomer having no acid-labile group known in the resist field can be used. The structural unit(s) preferably has a hydroxy group, a carboxy group or a lactone ring. By using a resin containing a structural unit having a hydroxy group or a carboxy group and no acid-labile group (hereinafter sometimes referred to as "structural unit (a2)") and / or a structural unit having a lactone ring and no acid-labile group (hereinafter sometimes referred to as "structural unit (a3)") in the resist composition of the present invention, the resolution of the resist pattern and the adhesion to the substrate can be improved. In addition to the above-described structural units, the structural unit(s) includes a structural unit having a halogen atom (hereinafter sometimes referred to as "structural unit (a4)"), a structural unit having a non-leaving hydrocarbon group (hereinafter sometimes referred to as "structural unit (a5)"), a structural unit having a sultone structure (hereinafter sometimes referred to as "structural unit (a6)"), or a structural unit that decomposes upon exposure to generate an acid (hereinafter sometimes referred to as "structural unit (a7)"), and the like.

[0072] 〈Structural unit (a2)〉 The structural unit (a2) is a structural unit represented by formula (a2) and has an alcoholic hydroxy group, a phenolic hydroxy group or a carboxy group. TIFF2025113197000060.tif4092[In formula (a2), R a2 represents a hydrogen atom, a halogen atom or an alkyl group having 1 to 6 carbon atoms which may have a halogen atom. A a21 represents a single bond or an alkanediyl group having 1 to 12 carbon atoms, and -CH2- contained in the alkanediyl group may be replaced by -O-, -CO- or -NR a28 -. R a28 represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms. L a21represents a single bond or a hydrocarbon group having 1 to 28 carbon atoms, the hydrocarbon group may have a substituent, and -CH2- contained in the hydrocarbon group may be replaced by -O-, -CO-, -S- or -SO2-. L a22 represents a single bond or a chain hydrocarbon group having 1 to 12 carbon atoms which may have a fluorine atom, and -CH2- contained in the chain hydrocarbon group may be replaced by -O- or -CO-. na2 represents any integer from 1 to 5. When na2 is 2 or more, a plurality of Ls a22 may be the same as or different from each other.

[0073] R a2 Examples of the halogen atom in R include a fluorine atom, an iodine atom, a chlorine atom, a bromine atom and the like. R a2 Examples of the alkyl group having 1 to 6 carbon atoms which may have a halogen atom in R include a trifluoromethyl group, a difluoromethyl group, a methyl group, a perfluoroethyl group, a 2,2,2-trifluoroethyl group, a 1,1,2,2-tetrafluoroethyl group, an ethyl group, a perfluoropropyl group, a 2,2,3,3,3-pentafluoropropyl group, a propyl group, a perfluorobutyl group, a 1,1,2,2,3,3,4,4-octafluorobutyl group, a butyl group, a perfluoropentyl group, a 2,2,3,3,4,4,5,5,5-nonafluoropentyl group, a pentyl group, a hexyl group, a perfluorohexyl group, a chloromethyl group, a bromomethyl group and an iodomethyl group. The number of carbon atoms of the alkyl group is preferably 1 to 4, more preferably 1 to 3, and still more preferably 1 or 2. R a2 is preferably a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, more preferably a hydrogen atom, a methyl group or an ethyl group, and still more preferably a hydrogen atom or a methyl group.

[0074] A a21Examples of the alkanediyl group include linear alkanediyl groups such as methylene group, ethylene group, propane-1,3-diyl group, propane-1,2-diyl group, butane-1,4-diyl group, pentane-1,5-diyl group, hexane-1,6-diyl group, heptane-1,7-diyl group, octane-1,8-diyl group, nonane-1,9-diyl group, decane-1,10-diyl group, undecane-1,11-diyl group, dodecane-1,12-diyl group, and branched alkanediyl groups such as butane-1,3-diyl group, 2-methylpropane-1,3-diyl group, 2-methylpropane-1,2-diyl group, pentane-1,4-diyl group, 2-methylbutane-1,4-diyl group, heptane-1,6-diyl group, octane-1,7-diyl group, nonane-1,8-diyl group, decane-1,9-diyl group, undecane-1,10-diyl group. The number of carbon atoms in the alkanediyl group is preferably 1 to 10, more preferably 1 to 8, still more preferably 1 to 6, even more preferably 1 to 4, still even more preferably 1 to 3, and even more preferably 1 or 2. R a28 Examples of the alkyl group include methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, and tert-butyl group. A a21 When -CH2- contained in the alkanediyl group of A is replaced by -O-, -CO- or -NR a28 -, the number of carbon atoms before replacement is defined as the number of carbon atoms of the alkanediyl group. A a21 Examples of the group in which -CH2- contained in the alkanediyl group of A is replaced by -O-, -CO- or -NR a28 - include hydroxy group, carboxy group, carbonyl group, oxy group, amino group, alkoxy group, alkoxycarbonyl group, alkylcarbonyl group, alkylamino group, peptide group, alkanediyl-oxy group, alkanediyl-oxycarbonyl group, alkanediyl-carbonyl group, alkanediyl-carbonyl-oxy group, alkanediyl-sulfonyl group, alkanediyl-thio group, alkanediyl-amino group, etc. These replaced groups include those similar to those exemplified in this specification as long as the upper limit of the number of carbon atoms permits. A a21 The -CH2- contained in the alkandiyl group of is replaced by -O-, -CO- or -NR a28 - groups include *-O-, *-CO-O-, *-O-CO-, *-CO-O-A a22 -CO-O-, *-O-CO-A a22 -O-, *-O-A a22 -CO-O-, *-CO-O-A a22 -O-CO-, *-O-CO-A a22 -O-CO-, *-CO-NR a28 - etc. Among them, *-CO-O-, *-CO-O-A a22 -CO-O-, *-O-A a22 -CO-O-, *-CO-NR a28 - etc. are preferred. Here, A a22 represents an alkandiyl group having 1 to 8 carbon atoms, and * represents the bonding site with the carbon atom to which R a2 is bonded. The alkandiyl group of A a22 includes the same alkandiyl groups as A a21 within the range allowed by the upper limit of the number of carbon atoms. A a21 is preferably a single bond, *-CO-O- or *-CO-O-A a22 -CO-O-, more preferably a single bond, *-CO-O- or *-CO-O-CH2-CO-O-, and even more preferably a single bond or *-CO-O-. L a21 The hydrocarbon group in is a (na2 + 1)-valent hydrocarbon group, and examples include linear or branched chain hydrocarbon groups, monocyclic or polycyclic (including spiro rings, condensed rings, bridged rings, etc.) alicyclic hydrocarbon groups, cyclic hydrocarbon groups such as aromatic hydrocarbon groups, and groups formed by combining two or more of these groups (for example, hydrocarbon groups formed from alicyclic hydrocarbon groups or aromatic hydrocarbon groups and chain hydrocarbon groups) may also be used. L a21 Examples of the chain hydrocarbon group of include divalent to hexavalent chain hydrocarbon groups such as alkandiyl groups, alkanetriyl groups, alkanetetrayl groups, alkanepentayl groups, alkanexayl groups, etc. Examples of the alkanediyl group include, for example, A a21 and the same alkanediyl groups as those described above. Examples of the alkanetriyl group include a methanetriyl group, an ethanetriyl group, a propanetriyl group, a butanetriyl group, a pentanetriyl group, a hexanetriyl group, a heptanetriyl group, an octanetriyl group, a nonanetriyl group, a decanetriyl group, an undecanetriyl group, a dodecanetriyl group, a tridecanetriyl group, a tetradecanetriyl group, a pentadecanetriyl group, a hexadecanetriyl group, a heptadecanetriyl group, and the like. Examples of the alkanetetrayl group include a methanetetrayl group, an ethanetetrayl group, a propanetetrayl group, a butanetetrayl group, a pentanetetrayl group, a hexanetetrayl group, a heptanetetrayl group, an octanetetrayl group, a nonanetetrayl group, a decanetetrayl group, an undecanetetrayl group, a dodecanetetrayl group, a tridecanetetrayl group, a tetradecanetetrayl group, a pentadecanetetrayl group, a hexadecanetetrayl group, a heptadecanetetrayl group, and the like. Examples of the alkanepentayl group include a methanepentayl group, an ethanepentayl group, a propanepentayl group, a butanepentayl group, a pentanepentayl group, a hexanepentayl group, and the like. Examples also include groups in which one or more hydrogen atoms of the above-described groups are replaced by bonding sites. The number of carbon atoms in the chain hydrocarbon group is preferably 1 to 18, more preferably 1 to 12, still more preferably 1 to 10, even more preferably 1 to 9, still even more preferably 1 to 8, still more preferably 1 to 6, still even more preferably 1 to 5, and particularly preferably 1 to 4. L a21 Examples of the monocyclic and polycyclic alicyclic hydrocarbon groups in L include the following alicyclic hydrocarbon groups and the like. The bonding site can be at any position. TIFF2025113197000061.tif46168For example, divalent to hexavalent alicyclic hydrocarbon groups such as cycloalkanediyl groups, cycloalkanetriyl groups, cycloalkanetetrayl groups, cycloalkanepentayl groups, cycloalkanhexayl groups, etc. can be mentioned. Specifically, monocyclic alicyclic hydrocarbon groups such as cyclobutane-1,3-diyl group, cyclopentane-1,3-diyl group, cyclohexane-1,4-diyl group, cyclooctane-1,5-diyl group, cyclopropanetriyl group, cyclobutanetriyl group, cyclopentanetriyl group, cyclohexanetriyl group, cycloheptanetriyl group, cyclooctanetriyl group, cyclodecanetriyl group, cyclopropanetetrayl group, cyclobutanetetrayl group, cyclopentanetetrayl group, cyclohexanetetrayl group, cycloheptanetetrayl group, cyclooctanetetrayl group, cyclodecanetetrayl group, etc. and polycyclic alicyclic hydrocarbon groups such as norbornane-1,4-diyl group, norbornane-2,5-diyl group, adamantane-1,5-diyl group, adamantane-2,6-diyl group, decahydronaphthalenediyl group, bicyclo[3.3.0]octanediy group, norbornanetriyl group, adamantanetriyl group, decahydronaphthalenetriyl group, bicyclo[3.3.0]octanetriyl group, norbornanetetrayl group, adamantanetetrayl group, decahydronaphthalenetetrayl group, bicyclo[3.3.0]octanetetrayl group, etc. can be mentioned. In addition, groups in which one or more hydrogen atoms of the above-mentioned groups are replaced with bonding sites, etc. can also be mentioned. The number of carbon atoms of the alicyclic hydrocarbon group is preferably 3 to 20, more preferably 3 to 18, still more preferably 3 to 16, even more preferably 3 to 12, still even more preferably 6 to 12, and particularly preferably 6 to 10. L a21 Examples of the aromatic hydrocarbon group in L include divalent to hexavalent aromatic hydrocarbon groups such as arylene groups, arenetriyl groups, arenetetrayl groups, arenepentayl groups, arenexayl groups, etc. Specifically, examples thereof include aromatic hydrocarbon groups such as a phenylene group, a naphthylene group, an anthrylene group, a biphenylene group, a phenanthrylene group, a benzenetriyl group, a naphthalenetriyl group, an anthracenetriyl group, a biphenylenetriyl group, a phenanthrenetriyl group, a benzenetetrayl group, a naphthalenetetrayl group, an anthracenetetrayl group, a biphenylenetetrayl group, and a phenanthrenetetrayl group. Examples thereof also include a group in which one or more hydrogen atoms of the above-described group are replaced with a bonding site, and the like. The number of carbon atoms of the aromatic hydrocarbon group is preferably from 6 to 20, more preferably from 6 to 18, still more preferably from 6 to 14, even more preferably from 6 to 12, and even more preferably from 6 to 10. Examples of the group formed by combining two or more types include a group formed by combining an alicyclic hydrocarbon group and a chain hydrocarbon group, a group formed by combining an aromatic hydrocarbon group and a chain hydrocarbon group, a group formed by combining an alicyclic hydrocarbon group and an aromatic hydrocarbon group, and a group formed by combining an alicyclic hydrocarbon group, a chain hydrocarbon group, and an aromatic hydrocarbon group. In the combination, the alicyclic hydrocarbon group, the aromatic hydrocarbon group, and the chain hydrocarbon group may each be combined with two or more types. Further, any group may be bonded to A a21 and L a22 and may be bonded thereto. Examples of the group in which -CH2- contained in the hydrocarbon group is replaced by -O-, -S-, -SO2- or -CO- include a hydroxy group, a carboxy group, a thiol group, an alkoxy group, an alkylthio group, an alkoxycarbonyl group, an alkylsulfonyl group, an alkylcarbonyl group, an alkylcarbonyloxy group, an alkoxycarbonyloxy group, an oxy group, a carbonyl group, a thio group, a sulfonyl group, an alkanedioxy group, an alkanedioxycarbonyl group, an alkanediylcarbonyl group, an alkanediylcarbonyloxy group, an alkanediylsulfonyl group, an alkanediylthio group, a cycloalkoxy group, a cycloalkylalkoxy group, an aromatic hydrocarbon group-carbonyl-oxy group, an aromatic hydrocarbon group-carbonyl group, an aromatic hydrocarbon group-oxy group, a group formed by combining two or more of these groups, and the like. Also included are groups in which one or more hydrogen atoms of these groups are replaced by a bonding site, and the like. These replaced groups include those similar to the groups exemplified in this specification within the range allowed by the upper limit of the number of carbon atoms.

[0075] Examples of the group in which -CH2- contained in the alicyclic hydrocarbon group and the group formed by combining the alicyclic hydrocarbon group and the aromatic hydrocarbon group is replaced by -O-, -S-, -CO- or -SO2- include those similar to the groups exemplified in this specification within the range allowed by the upper limit of the number of carbon atoms. L a21 The hydrocarbon group in L may have one or more substituents. Examples of the substituent include a halogen atom, a haloalkyl group having 1 to 12 carbon atoms, an alkyl group having 1 to 16 carbon atoms (wherein -CH2- contained in the alkyl group may be replaced by -O- or -CO-), an acryloyloxy group, a methacryloyloxy group, and the like. Examples of the halogen atom include a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, and the like. L a21The hydrocarbon group in [substance] can, by having a halogen atom as a substituent, substantially have substituents such as a haloalkyl group. Examples of the haloalkyl group include an alkyl fluoride group, an alkyl chloride group, an alkyl bromide group, an alkyl iodide group, etc. For example, a chloromethyl group, a bromomethyl group, an iodomethyl group, a fluoromethyl group, a difluoromethyl group, a trifluoromethyl group, a perfluoroethyl group, a perfluoropropyl group, a perfluorobutyl group, etc. may be mentioned. The number of carbon atoms of the haloalkyl group is preferably 1 to 8, more preferably 1 to 6, still more preferably 1 to 4, and even more preferably 1 to 3. L a21 The hydrocarbon group of [substance], by including a branched structure, [substance] a21 can substantially have substituents such as an alkyl group. Examples of the alkyl group include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, a sec-butyl group, a tert-butyl group, a pentyl group, a hexyl group, a heptyl group, a 2-ethylhexyl group, an octyl group, a nonyl group, a decyl group, an undecyl group, a dodecyl group, etc. The number of carbon atoms of the alkyl group is preferably 1 to 12, more preferably 1 to 10, still more preferably 1 to 8, even more preferably 1 to 6, still even more preferably 1 to 4, and even more preferably 1 to 3. L a21 The -CH2- contained in the hydrocarbon group of [substance] is replaced by a group such as -O- or -CO-, [substance] a21can substantially have substituents such as a hydroxy group, a carboxy group, an alkoxy group, a thiol group, a sulfonyl group, an alkoxycarbonyl group, an alkylcarbonyl group, an alkylcarbonyloxy group, an alkoxyalkyl group, an alkoxyalkoxy group, an acryloyloxy group, a methacryloyloxy group, etc. The number of carbon atoms of the alkoxy group is preferably 1 to 12, more preferably 1 to 6, still more preferably 1 to 4, and even more preferably 1 to 3. The number of carbon atoms of the alkoxycarbonyl group, the alkylcarbonyl group, and the alkylcarbonyloxy group is preferably 2 to 12, more preferably 2 to 6, still more preferably 2 to 4, and even more preferably 2 to 3. The number of carbon atoms of the alkoxyalkyl group and the alkoxyalkoxy group is preferably 2 to 12, more preferably 2 to 8, still more preferably 2 to 6, and even more preferably 2 to 4. Examples of the above groups also include those similar to those exemplified in this specification. L a21 The substituents that the hydrocarbon group in L may have include a halogen atom, a haloalkyl group having 1 to 8 carbon atoms, or an alkyl group having 1 to 12 carbon atoms (the -CH2- contained in the alkyl group may be replaced by -O- or -CO-). A halogen atom, a haloalkyl group having 1 to 6 carbon atoms, or an alkyl group having 1 to 10 carbon atoms (the -CH2- contained in the alkyl group may be replaced by -O- or -CO-) is more preferable. A halogen atom, a haloalkyl group having 1 to 4 carbon atoms, an alkyl group having 1 to 4 carbon atoms, a hydroxy group, an alkoxy group having 1 to 4 carbon atoms, or an alkoxyalkoxy group having 2 to 8 carbon atoms is still more preferable. A fluorine atom, an iodine atom, a trifluoromethyl group, a methyl group, a hydroxy group, a methoxy group, an ethoxy group, an ethoxyethoxy group, or an ethoxymethoxy group is even more preferable. A fluorine atom, an iodine atom, a trifluoromethyl group, a methyl group, a hydroxy group, a methoxy group, or an ethoxyethoxy group is still even more preferable. Also, when the alkanediyl group of L is replaced by -O-, -CO-, etc., for example, *-L a21 -X a23 -X a21 -(La23 represents an alkanediyl group having 1 to 8 carbon atoms, and X a21 represents -O-, -O-CO-, -CO-O- or -O-CO-O-, and * represents the bonding site with A a21 . It is also preferable that it is (). L a21 is a single bond, an optionally substituted chain hydrocarbon group having 1 to 12 carbon atoms (provided that -CH2- contained in the chain hydrocarbon group may be replaced by -O- or -CO-), an optionally substituted cyclic hydrocarbon group having 3 to 20 carbon atoms (provided that -CH2- contained in the cyclic hydrocarbon group may be replaced by -O-, -S-, -CO- or -SO2-), or a group formed by combining an optionally substituted chain hydrocarbon group having 1 to 8 carbon atoms and an optionally substituted cyclic hydrocarbon group having 3 to 20 carbon atoms (provided that -CH2- contained in the chain hydrocarbon group may be replaced by -O- or -CO-, and -CH2- contained in the cyclic hydrocarbon group may be replaced by -O-, -S-, -SO2- or -CO-). It is preferably a single bond, an optionally substituted chain hydrocarbon group having 1 to 10 carbon atoms (provided that -CH2- contained in the chain hydrocarbon group may be replaced by -O- or -CO-), an optionally substituted cyclic hydrocarbon group having 3 to 18 carbon atoms (provided that -CH2- contained in the cyclic hydrocarbon group may be replaced by -O-, -S-, -CO- or -SO2-), or a group formed by combining an optionally substituted chain hydrocarbon group having 1 to 6 carbon atoms and an optionally substituted cyclic hydrocarbon group having 3 to 18 carbon atoms (provided that -CH2- contained in the chain hydrocarbon group may be replaced by -O- or -CO-, and -CH2- contained in the cyclic hydrocarbon group may be replaced by -O-, -S-, -SO2- or -CO-).

[0076] L a22Examples of the chain hydrocarbon group having 1 to 12 carbon atoms include linear alkanediyl groups such as methylene group, ethylene group, propane-1,3-diyl group, propane-1,2-diyl group, butane-1,4-diyl group, pentane-1,5-diyl group, hexane-1,6-diyl group, heptane-1,7-diyl group, octane-1,8-diyl group, nonane-1,9-diyl group, decane-1,10-diyl group, undecane-1,11-diyl group, dodecane-1,12-diyl group, etc., and branched alkanediyl groups such as ethane-1,1-diyl group, propane-1,1-diyl group, propane-1,2-diyl group, propane-2,2-diyl group, 1-methylpropane-1,3-diyl group, 2-methylpropane-1,3-diyl group, 2-methylpropane-1,2-diyl group, 1-dimethylpropane-1,3-diyl group, pentane-2,4-diyl group, pentane-1,4-diyl group, 2-methylbutane-1,4-diyl group, etc. The number of carbon atoms of the chain hydrocarbon group is preferably 1 to 10, more preferably 1 to 8, still more preferably 1 to 6, and even more preferably 1 to 4. L a22 The fluorine atom(s) that L has may be one or two or more. L a22 The -CH2- contained in the chain hydrocarbon group of L may be replaced by -O- or -CO-, and these replaced groups are the same as those exemplified for L within the range where the upper limit of the number of carbon atoms permits. a21 The same ones as those exemplified for L can be mentioned. na2 is preferably any integer from 1 to 4, and more preferably any integer from 1 to 3. L a21 Examples of the structural unit (a2) when L is a single bond or a chain hydrocarbon group include, for example, the following structural units. Among the following structural units, the structural units in which the methyl group corresponding to R is replaced by a hydrogen atom or the like are also suitable structural units of the structural unit (a2) in the same manner as the following structural units. a2 The structural units in which the methyl group corresponding to R is replaced by a hydrogen atom or the like are also suitable structural units of the structural unit (a2) in the same manner as the following structural units. TIFF2025113197000062.tif69168

[0077] When producing a resist pattern from the resist composition of the present invention, when using a high-energy ray such as a KrF excimer laser (248 nm), an electron beam, or EUV (extreme ultraviolet light) as an exposure light source, as the structural unit (a2), a structural unit (a2) having a phenolic hydroxy group is preferable, and it is more preferable to use the structural unit (a2-A) described later. Further, when using an ArF excimer laser (193 nm) or the like, as the structural unit (a2), a structural unit (a2) having an alcoholic hydroxy group is preferable, and it is more preferable to use the structural unit (a2-C) described later. The structural unit (a2) may contain one kind alone or two or more kinds.

[0078] In the structural unit (a2), L a21 When it is a cyclic hydrocarbon group, examples of the structural unit having a phenolic hydroxy group or a carboxy group include a structural unit represented by the formula (a2-A) (hereinafter sometimes referred to as "structural unit (a2-A)"). TIFF2025113197000063.tif30128[In the formula (a2-A), R a2 represents a hydrogen atom, a halogen atom, or an alkyl group having 1 to 6 carbon atoms which may have a halogen atom. R a27 represents a halogen atom, a hydroxy group, a carboxy group, an alkyl group having 1 to 6 carbon atoms which may have a halogen atom, an alkoxy group having 1 to 6 carbon atoms, an alkoxyalkyl group having 2 to 12 carbon atoms, an alkoxyalkoxy group having 2 to 12 carbon atoms, an alkylcarbonyl group having 2 to 4 carbon atoms, an alkylcarbonyloxy group having 2 to 4 carbon atoms, an acryloyloxy group, or a methacryloyloxy group. A a21 represents a single bond or an alkanediyl group having 1 to 12 carbon atoms, and -CH2- contained in the alkanediyl group may be replaced by -O-, -CO-, or -NR a28 -. R a28 represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms. X a2 represents a single bond or a carbonyl group. nA2 represents any integer from 1 to 5, and when nA2 is 2 or more, the groups within the plurality of parentheses may be the same as or different from each other. na21 represents any integer from 0 to 4, and when na21 is 2 or more, the plurality of Rs a27 may be the same as or different from each other. mc represents any integer from 0 to 2.

[0079] R a2 and A a21 are each exemplified by the same groups as those exemplified by formula (a2). R a27 Examples of the halogen atom in R include a fluorine atom, a chlorine atom, an iodine atom, a bromine atom, and the like. R a27 Examples of the alkyl group having 1 to 6 carbon atoms which may have a halogen atom in R include a trifluoromethyl group, a difluoromethyl group, a methyl group, a perfluoroethyl group, a 2,2,2-trifluoroethyl group, a 1,1,2,2-tetrafluoroethyl group, an ethyl group, a perfluoropropyl group, a 2,2,3,3,3-pentafluoropropyl group, a propyl group, a perfluorobutyl group, a 1,1,2,2,3,3,4,4-octafluorobutyl group, a butyl group, a perfluoropentyl group, a 2,2,3,3,4,4,5,5,5-nonafluoropentyl group, a pentyl group, a hexyl group, a perfluorohexyl group, a chloromethyl group, a bromomethyl group, and an iodomethyl group. The alkyl group is preferably an alkyl group having 1 to 4 carbon atoms, more preferably an alkyl group having 1 to 3 carbon atoms, still more preferably a methyl group or an ethyl group, and even more preferably a methyl group. R a27 Examples of the alkoxy group of R include a methoxy group, an ethoxy group, a propoxy group, an isopropoxy group, a butoxy group, a sec-butoxy group, and a tert-butoxy group. The alkoxy group is preferably an alkoxy group having 1 to 4 carbon atoms, more preferably an alkoxy group having 1 to 3 carbon atoms, still more preferably a methoxy group or an ethoxy group, and even more preferably a methoxy group. R a27Examples of the alkoxyalkyl group include a methoxymethyl group, an ethoxyethyl group, a propoxymethyl group, an isopropoxymethyl group, a butoxymethyl group, a sec-butoxymethyl group, and a tert-butoxymethyl group. The alkoxyalkyl group is preferably an alkoxyalkyl group having 2 to 8 carbon atoms, more preferably an alkoxyalkyl group having 2 to 4 carbon atoms, still more preferably a methoxymethyl group or an ethoxyethyl group, and even more preferably a methoxymethyl group. R a27 Examples of the alkoxyalkoxy group include a methoxymethoxy group, a methoxyethoxy group, an ethoxymethoxy group, an ethoxyethoxy group, a propoxymethoxy group, an isopropoxymethoxy group, a butoxymethoxy group, a sec-butoxymethoxy group, and a tert-butoxymethoxy group. The alkoxyalkoxy group is preferably an alkoxyalkoxy group having 2 to 8 carbon atoms, more preferably an alkoxyalkoxy group having 2 to 4 carbon atoms, still more preferably a methoxyethoxy group or an ethoxyethoxy group. R a27 Examples of the alkylcarbonyl group include an acetyl group, a propionyl group, and a butyryl group. The alkylcarbonyl group is preferably an alkylcarbonyl group having 2 to 4 carbon atoms, more preferably an alkylcarbonyl group having 2 to 3 carbon atoms, and still more preferably an acetyl group. R a27 Examples of the alkylcarbonyloxy group include an acetyloxy group, a propionyloxy group, and a butyryloxy group. The alkylcarbonyloxy group is preferably an alkylcarbonyloxy group having 2 to 4 carbon atoms, more preferably an alkylcarbonyloxy group having 2 to 3 carbon atoms, and still more preferably an acetyloxy group. R a27 is preferably a halogen atom, a hydroxy group, a carboxy group, an alkyl group having 1 to 4 carbon atoms which may have a halogen atom, an alkoxy group having 1 to 4 carbon atoms, or an alkoxyalkoxy group having 2 to 8 carbon atoms, more preferably a fluorine atom, an iodine atom, a hydroxy group, a methyl group, a methoxy group, an ethoxy group, an ethoxyethoxy group, or an ethoxymethoxy group, and still more preferably a fluorine atom, an iodine atom, a hydroxy group, a methyl group, a methoxy group, or an ethoxyethoxy group. nA2 is preferably 1, 2, 3 or 4, more preferably 1, 2 or 3, and still more preferably 1 or 2. na21 is preferably 0, 1, 2 or 3, more preferably 0, 1 or 2, and still more preferably 0 or 1. mc is preferably 0 or 1. -X a2 -OH, in the case of a benzene ring, may be bonded to any of the o-position, m-position or p-position with respect to the bonding position of A a21 Among them, at least one is preferably bonded to the m-position or p-position, and more preferably bonded to the m-position. In the case of a naphthalene ring, when the bonding position of A a21 is at the 1-position, it may be bonded to any of the 2nd to 8th positions, and when the bonding position of A a21 is at the 2nd position, it may be bonded to any of the 1st and 3rd to 8th positions. Among them, when the bonding position of A a21 is at the 1st position, at least one is preferably bonded to the 3rd to 6th positions, and more preferably bonded to the 3rd or 4th position. When the bonding position of A a21 is at the 2nd position, it is preferably bonded to the 4th to 7th positions, and more preferably bonded to the 5th or 6th position.

[0080] Examples of the structural unit (a2-A) include structural units derived from the monomers described in JP-A-2010-204634 and JP-A-2012-12577. Examples of the structural unit (a2-A) include the structural units represented by formula (a2-2-1) to formula (a2-2-32), formula (a2-3-1) to formula (a2-3-24), and the structural units represented by formula (a2-2-1) to formula (a2-2-32), formula (a2-3-1) to formula (a2-3-24), in which the methyl group corresponding to R a2 in the structural unit (a2-A) is replaced by a hydrogen atom, a halogen atom, a haloalkyl group or another alkyl group. TIFF2025113197000064.tif107170

[0081] When the structural unit (a2-A) is included in the resin (A) etc., the content rate of the structural unit (a2-A) is preferably 5 mol% or more, more preferably 10 mol% or more, still more preferably 15 mol% or more, and even more preferably 20 mol% or more, with respect to all the structural units. Also, it is preferably 80 mol% or less, more preferably 70 mol% or less, still more preferably 65 mol% or less, even more preferably 60 mol% or less, still even more preferably 50 mol% or less, still more preferably 45 mol% or less, and even more preferably 40 mol% or less. Specifically, it is preferably 5 to 80 mol%, more preferably 10 to 70 mol%, still more preferably 15 to 65 mol%, and even more preferably 20 to 65 mol%. The structural unit (a2-A) can be included in the resin (A) etc. by polymerizing a compound that induces the structural unit (a2-A) (for example, a compound (a2-A’) etc. in which the -CH2-C(-R a2 )- of the structural unit (a2-A) is in the state of CH2=C(-R a2 ) of the double bond before cleavage). Also, for example, after polymerization using the structural unit (a1-4), it can be included in the resin (A) etc. by treatment with an acid such as p-toluenesulfonic acid. Also, after polymerization using acetoxystyrene etc., the structural unit (a2-A) can be included in the resin (A) etc. by treatment with an alkali such as tetramethylammonium hydroxide.

[0082] In the structural unit (a2), when L a21 is a cyclic hydrocarbon group, examples of the structural unit having an alcoholic hydroxy group or a carboxy group include the structural unit represented by formula (a2-B) (hereinafter sometimes referred to as "structural unit (a2-B)"), the structural unit represented by formula (a2-C) (hereinafter sometimes referred to as "structural unit (a2-C)"), and the structural unit represented by formula (a2-D) (hereinafter sometimes referred to as "structural unit (a2-D)"). In formulas (a2-B) and (a2-C), R a2 represents the same meaning as in formula (a2). R a27 represents the same meaning as in formula (a2-A). L a25 represents -O- or *-O-(CH2) k2 -CO-O-, k2 represents an integer from 1 to 7. * represents the bonding site with -CO-. X a2 represents a single bond or -CO-. R a25 and R a26 each independently represent a hydrogen atom, a methyl group or a hydroxy group. nB2 represents an integer from 1 to 5. When nB2 is 2 or more, the plurality of X a2 may be the same as or different from each other. nB22 represents an integer from 0 to 8. When nB22 is 2 or more, the plurality of R a27 may be the same as or different from each other. nC22 represents an integer from 0 to 10. When nC22 is 2 or more, the plurality of R a27 may be the same as or different from each other.] L a25 is preferably -O-, -O-(CH2) f1 -CO-O- (where f1 represents an integer from 1 to 4), more preferably -O-. R a2 is preferably a methyl group. X a2 is preferably a single bond. R a25 is preferably a hydrogen atom. R a26 is preferably a hydrogen atom or a hydroxy group. R a27is preferably a halogen atom, a hydroxy group, a carboxy group, an optionally halogenated C1-C4 alkyl group, a C1-C4 alkoxy group or a C2-C8 alkoxyalkoxy group, more preferably a fluorine atom, an iodine atom, a hydroxy group, a methyl group, a methoxy group, an ethoxy group, an ethoxyethoxy group or an ethoxymethoxy group, and even more preferably a fluorine atom, an iodine atom, a hydroxy group, a methyl group, a methoxy group or an ethoxyethoxy group. nB2 is preferably 1, 2, 3 or 4, more preferably 1, 2 or 3, and even more preferably 1 or 2. nB22 is preferably any integer from 0 to 3, more preferably 0, 1 or 2, and even more preferably 0 or 1. nC22 is preferably any integer from 0 to 6, more preferably any integer from 0 to 3, and even more preferably 0 or 1.

[0083] Examples of the structural unit (a2-B) and the structural unit (a2-C) include structural units derived from the monomers described in JP-A-2010-204646, the following structural units, and methyl groups or hydrogen atoms corresponding to R in the following structural units a2 which are replaced with a hydrogen atom, a halogen atom, a haloalkyl group or another alkyl group. Among them, the structural units represented by any of formula (a2-B-1) to formula (a2-B-5) and formula (a2-C-1) to formula (a2-C-9) are preferable. When the resin (A) etc. contains the structural unit (a2-B) or the structural unit (a2-C), the content thereof is 1 mol% or more, preferably 2 mol% or more, based on all the structural units of the resin (A) etc. Further, it is 45 mol% or less, preferably 40 mol% or less, more preferably 35 mol% or less, even more preferably 20 mol% or less, and still more preferably 10 mol% or less. Specifically, 1 to 45 mol% is mentioned, preferably 1 to 40 mol%, more preferably 1 to 35 mol%, even more preferably 1 to 20 mol%, and still more preferably 1 to 10 mol%.

[0084] TIFF2025113197000068.tif51106[In formula (a2-D), R a2 and A a21 each represent the same meaning as in formula (a2). R a27 represents the same meaning as in formula (a2-A). R a21 and R a22 each independently represent an alkyl fluoride group having 1 to 4 carbon atoms. L a24 represents a single bond or an alkanediyl group having 1 to 3 carbon atoms, and the alkanediyl group may be substituted with a fluorine atom. nD2 represents any integer from 1 to 5. When nD2 is 2 or more, the groups in multiple parentheses may be the same or different from each other. nD22 represents any integer from 0 to 4. When nD22 is 2 or more, multiple R a27 may be the same or different from each other. However, 1 ≦ nD2 + nD22 ≦ 5.] R a21 and R a22 As the alkyl fluoride groups of, each independently, a trifluoromethyl group, 2,2,2-trifluoroethyl group, 3,3,3-trifluoropropyl group, 4,4,4-trifluorobutyl group, etc. may be mentioned. R a21 and R a22 are preferably a trifluoromethyl group. L a24 As the alkanediyl groups of, a methylene group, ethane-1,1-diyl group, propane-1,1-diyl group, propane-2,2-diyl group, etc. may be mentioned. L a24 is preferably a single bond or a methylene group. R a27is preferably a halogen atom, a hydroxy group, a carboxy group, an alkyl group having 1 to 4 carbon atoms which may have a halogen atom, an alkoxy group having 1 to 4 carbon atoms or an alkoxyalkoxy group having 2 to 8 carbon atoms, more preferably a fluorine atom, an iodine atom, a hydroxy group, a methyl group, a methoxy group, an ethoxy group, an ethoxyethoxy group or an ethoxymethoxy group, and still more preferably a fluorine atom, an iodine atom, a hydroxy group, a methyl group, a methoxy group or an ethoxyethoxy group. nD2 is preferably 1, 2, 3 or 4, more preferably 1, 2 or 3, still more preferably 1 or 2, and even more preferably 1. Further, preferably, nD2 is 1 and the group in parentheses is bonded to the para position. nD22 is preferably any integer from 0 to 3, more preferably any integer from 0 to 2, still more preferably 0 or 1, and even more preferably 0.

[0085] As the structural unit (a2-D), a structural unit represented by the following formula (a2-D1) (hereinafter sometimes referred to as "structural unit (a2-D1)") is more preferable. TIFF2025113197000069.tif51107[In formula (a2-D1), R a2 、A a21 、R a27 、nD2 and nD22 represent the same meanings as in formula (a2-D).] In formula (a2-D1), R a2 is preferably a hydrogen atom or a methyl group. A a21 is preferably a single bond.

[0086] Examples of the structural unit (a2-D) include the structural units described below. TIFF2025113197000070.tif63167

[0087] In the structural units represented by formulas (a2-D-1) to (a2-D-8), R a2A structural unit in which a hydrogen atom corresponding to is replaced by a methyl group or the like, and in the structural units represented by Formula (a2-D-9) to Formula (a2-D-16), R a2 Structural units in which the methyl group corresponding to is replaced by a hydrogen atom or the like can also be cited as specific examples of the structural unit (a2-D). Among them, the structural units represented by Formula (a2-D-1) to Formula (a2-D-8) are preferable, the structural units represented by Formula (a2-D-1) to Formula (a2-D-4) are more preferable, and the structural unit represented by Formula (a2-D-1) is even more preferable.

[0088] When the resin (A) or the like contains the structural unit (a2-D), the content is preferably 3 mol% or more, more preferably 5 mol% or more, still more preferably 10 mol% or more, based on all the structural units of the resin (A) or the like. Also, it is preferably 80 mol% or less, more preferably 75 mol% or less, still more preferably 70 mol% or less, and even more preferably 65 mol% or less. Specifically, it is preferably 3 to 80 mol%, more preferably 5 to 75 mol%, still more preferably 10 to 70 mol%, and even more preferably 10 to 65 mol%.

[0089] 〈Structural unit (a3)〉 The lactone ring contained in the structural unit (a3) may be a monocyclic ring such as a β-propiolactone ring, a γ-butyrolactone ring, or a δ-valerolactone ring, or may be a condensed ring of a monocyclic lactone ring and another ring. Preferably, a γ-butyrolactone ring, an adamantane lactone ring, or a bridged ring containing a γ-butyrolactone ring structure (for example, the structural unit represented by the following Formula (a3-2)) can be cited.

[0090] The structural unit (a3) is preferably a structural unit represented by Formula (a3-1), Formula (a3-2), Formula (a3-3), or Formula (a3-4). These may be contained alone or in combination of two or more. TIFF2025113197000071.tif50162[In Formula (a3-1), Formula (a3-2), Formula (a3-3), and Formula (a3-4), L a4 、La5 and L a6 each independently represents a group represented by -O- or *-O-(CH2) k3 -CO-O- (where k3 represents an integer from 1 to 7). L a7 represents -O-, *-O-L a8 -O-, *-O-L a8 -CO-O-, *-O-L a8 -CO-O-L a9 -CO-O- or *-O-L a8 -O-CO-L a9 -O-. L a8 and L a9 each independently represents an alkanediyl group having 1 to 6 carbon atoms. * represents the bonding site with the carbonyl group. R a18 R a19 R a20 and R a24 each independently represents a hydrogen atom, a halogen atom, or an alkyl group having 1 to 6 carbon atoms which may have a halogen atom. X a3 represents -CH2- or an oxygen atom. R a21 represents an aliphatic hydrocarbon group having 1 to 4 carbon atoms. R a22 R a23 and R a25 each independently represents a carboxy group, a cyano group, or an aliphatic hydrocarbon group having 1 to 4 carbon atoms. p1 represents an integer from 0 to 5. q1 represents an integer from 0 to 3. r1 represents an integer from 0 to 3. w1 represents an integer from 0 to 8. When p1, q1, r1, and / or w1 is 2 or more, the plurality of Rs a21 R a22 R a23 and / or R a25 may be the same as or different from each other.]

[0091] R a21, R a22 , R a23 and R a25 Examples of the aliphatic hydrocarbon group in R a22 , R a23 and R a25 include alkyl groups such as methyl group, ethyl group, propyl group, isopropyl group, butyl group, sec-butyl group and tert-butyl group. R a18 , R a19 , R a20 and R a24 Examples of the halogen atom and the alkyl group which may have a halogen atom in R a18 , R a19 , R a20 and R a24 include those exemplified by R a01 , R a4 and R a5 . a01 , R a4 and R a5 L a8 and L a9 Examples of the alkanediyl group in L a8 and L a9 include methylene group, ethylene group, propane-1,3-diyl group, propane-1,2-diyl group, butane-1,4-diyl group, pentane-1,5-diyl group, hexane-1,6-diyl group, butane-1,3-diyl group, 2-methylpropane-1,3-diyl group, 2-methylpropane-1,2-diyl group, pentane-1,4-diyl group and 2-methylbutane-1,4-diyl group. L a4 , L a5 and L a6 are each independently preferably -O- or a group in which k3 is an integer of 1 to 4 in *-O-(CH2)k3-CO-O-, more preferably -O- and *-O-CH2-CO-O-, and still more preferably an oxygen atom. k3 L a7 is preferably -O- or *-O-Lk4-CO-O-, and more preferably -O-, -O-CH2-CO-O- or -O-C2H4-CO-O-. a8 R a18 , R a19 , R a20 and R a24 are preferably a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, more preferably a hydrogen atom, a methyl group or an ethyl group, and still more preferably a hydrogen atom or a methyl group. R a21 is preferably a methyl group. R a22 R a23 and R a25 are each independently preferably a carboxy group, a cyano group or a methyl group. p1, q1 and r1 are each independently preferably an integer of any one of 0 to 2, more preferably 0 or 1. w1 is preferably an integer of any one of 0 to 2, more preferably 0 or 1. In particular, formula (a3-4) is preferably formula (a3-4)'. TIFF2025113197000072.tif4051 (wherein R a24 and L a7 represent the same meaning as described above.)

[0092] Examples of the structural unit (a3) include structural units derived from the monomers described in JP-A-2010-204646, the monomers described in JP-A-2000-122294, and the monomers described in JP-A-2012-41274. Examples of the structural unit (a3) include structural units represented by any of formula (a3-1-1), formula (a3-1-2), formula (a3-2-1), formula (a3-2-2), formula (a3-3-1), formula (a3-3-2) and formula (a3-4-1) to formula (a3-4-12), and in the above structural units, the methyl groups corresponding to R a18 R a19 R a20 and R a24 in formula (a3-1) to formula (a3-4) are preferably structural units in which the methyl groups are replaced with hydrogen atoms. TIFF2025113197000073.tif107164

[0093] When the resin (A) etc. contain the structural unit (a3), the total content rate thereof is 1 mol% or more, preferably 3 mol% or more, more preferably 5 mol% or more, still more preferably 10 mol% or more, with respect to all the structural units of the resin (A) etc. Also, 70 mol% or less is mentioned, preferably 65 mol% or less, more preferably 60 mol% or less, still more preferably 50 mol% or less, even more preferably 40 mol% or less, still even more preferably 30 mol% or less, still more preferably 25 mol% or less, and still even more preferably 20 mol% or less. Specifically, 1 to 70 mol% is mentioned, preferably 3 to 70 mol%, more preferably 3 to 65 mol%, still more preferably 5 to 65 mol%, even more preferably 5 to 60 mol%, and still even more preferably 10 to 60 mol%. Also, the content rate of the structural unit (a3-1), the structural unit (a3-2), the structural unit (a3-3) or the structural unit (a3-4) is preferably 1 mol% or more, more preferably 3 mol% or more, still more preferably 5 mol% or more, and still more preferably 10 mol% or more, with respect to all the structural units of the resin (A) etc. Also, it is preferably 60 mol% or less, more preferably 55 mol% or less, still more preferably 50 mol% or less, even more preferably 40 mol% or less, still even more preferably 30 mol% or less, still more preferably 25 mol% or less, and still even more preferably 20 mol% or less. Specifically, 1 to 60 mol% is preferable, 3 to 60 mol% is more preferable, 3 to 55 mol% is still more preferable, 5 to 55 mol% is still more preferably, 5 to 50 mol% is even more preferable, and 10 to 50 mol% is still even more preferable.

[0094] 〈Structural unit (a4)〉 The structural unit represented by the formula (a4) is shown below. TIFF2025113197000074.tif2870 [In the formula (a4), R 41 represents a hydrogen atom or a methyl group. R 42represents an aliphatic hydrocarbon group having a halogen atom with 1 to 48 carbon atoms, and -CH2- contained in the aliphatic hydrocarbon group may be replaced by -O- or -CO-.

[0095] R 42 The aliphatic hydrocarbon group represented by may include a linear or branched chain hydrocarbon group, a monocyclic or polycyclic alicyclic hydrocarbon group, and a group formed by combining these. Examples of the chain hydrocarbon group include linear alkyl groups such as methyl group, ethyl group, propyl group, butyl group, pentyl group, hexyl group, heptyl group, octyl group, decyl group, dodecyl group, pentadecyl group, hexadecyl group, heptadecyl group, and octadecyl group; and branched alkyl groups such as isopropyl group and isobutyl group. Examples of the monocyclic or polycyclic alicyclic hydrocarbon group include monocyclic alicyclic hydrocarbon groups that are monocyclic cycloalkyl groups such as cyclopentyl group, cyclohexyl group, cycloheptyl group, and cyclooctyl group; and polycyclic alicyclic hydrocarbon groups that are polycyclic cycloalkyl groups such as decahydronaphthyl group, adamantyl group, norbornyl group, and the following group (* represents the bonding site). Examples of the group formed by the combination include groups formed by combining one or more alkyl groups or one or more alkanediyl groups with one or more alicyclic hydrocarbon groups, such as -alkanediyl group - alicyclic hydrocarbon group, -alicyclic hydrocarbon group - alkyl group, -alkanediyl group - alicyclic hydrocarbon group - alkyl group. Examples of the alkanediyl group include linear alkanediyl groups such as methylene group, ethylene group, propane - 1,3 - diyl group, butane - 1,4 - diyl group, pentane - 1,5 - diyl group, and hexane - 1,6 - diyl group; and branched alkanediyl groups such as propane - 1,2 - diyl group, butane - 1,3 - diyl group, 2 - methylpropane - 1,2 - diyl group, 1 - methylbutane - 1,4 - diyl group, and 2 - methylbutane - 1,4 - diyl group. The terminal of the branched alkanediyl group may be a methyl group. R 42Examples of the halogen atom included in the aliphatic hydrocarbon group include a fluorine atom, a chlorine atom, a bromine atom, or an iodine atom. R 42 Examples of the group in which -CH2- of the aliphatic hydrocarbon group included in is replaced by -O- or -CO- include a hydroxy group, a carboxy group, a carbonyl group, an oxy group, an alkoxy group, an alkoxycarbonyl group, an alkylcarbonyl group, an alkylcarbonyloxy group, an alkanedioxy group, an alkanedioxycarbonyl group, an alkanediylcarbonyl group, an alkanediylcarbonyloxy group, a cycloalkoxy group, a cycloalkylalkoxy group, a group formed by combining two or more of these groups, and the like. These replaced groups include the same groups as those exemplified in this specification within the range where the upper limit of the number of carbon atoms permits.

[0096] As the structural unit (a4), R 42 is preferably an aliphatic hydrocarbon group having a fluorine atom, and an example of the structural unit (a4) in which R 42 is an aliphatic hydrocarbon group having a fluorine atom includes a structural unit represented by the formula (a4-1) (hereinafter sometimes referred to as "structural unit (a4-1)"), a structural unit represented by the formula (a4-2) (hereinafter sometimes referred to as "structural unit (a4-2)"), a structural unit represented by the formula (a4-3) (hereinafter sometimes referred to as "structural unit (a4-3)"), and a structural unit represented by the formula (a4-A) (hereinafter sometimes referred to as "structural unit (a4-A)"). The structural unit represented by the formula (a4-1) is the structural unit shown below. TIFF2025113197000076.tif3092[In the formula (a4-1), R 41 represents a hydrogen atom or a methyl group. L 41 represents a single bond or an alkanediyl group having 1 to 4 carbon atoms. L 42f represents an alkanediyl group having 1 to 8 carbon atoms and having a fluorine atom or a cycloalkanediyl group having 3 to 12 carbon atoms and having a fluorine atom. R 42frepresents a hydrogen atom or a fluorine atom.

[0097] L 41 Examples of the alkanediyl group in L include linear alkanediyl groups such as methylene group, ethylene group, propane-1,3-diyl group, butane-1,4-diyl group, etc., and branched alkanediyl groups such as ethane-1,1-diyl group, propane-1,2-diyl group, butane-1,3-diyl group, 2-methylpropane-1,3-diyl group, and 2-methylpropane-1,2-diyl group. The terminal of the branched alkanediyl group may be a methyl group. L 42f Examples of the alkanediyl group having a fluorine atom in L include linear alkanediyl groups having a fluorine atom such as methylene group having a fluorine atom, ethylene group having a fluorine atom, propane-1,3-diyl group having a fluorine atom, butane-1,4-diyl group having a fluorine atom, pentane-1,5-diyl group having a fluorine atom, hexane-1,6-diyl group having a fluorine atom, heptane-1,7-diyl group having a fluorine atom, octane-1,8-diyl group having a fluorine atom, etc.; branched alkanediyl groups having a fluorine atom such as ethane-1,1-diyl group having a fluorine atom, propane-1,1-diyl group having a fluorine atom, propane-1,2-diyl group having a fluorine atom, propane-2,2-diyl group having a fluorine atom, pentane-2,4-diyl group having a fluorine atom, 2-methylpropane-1,3-diyl group having a fluorine atom, 2-methylpropane-1,2-diyl group having a fluorine atom, pentane-1,4-diyl group having a fluorine atom, 2-methylbutane-1,4-diyl group having a fluorine atom, etc. The terminal of the branched alkanediyl group may be a methyl group which may have a fluorine atom. L 42fExamples of the cycloalkanediyl group having a fluorine atom in L include monocyclic cycloalkanediyl groups having a fluorine atom such as a cyclobutane-1,3-diyl group having a fluorine atom, a cyclopentane-1,3-diyl group having a fluorine atom, a cyclohexane-1,4-diyl group having a fluorine atom, a cyclohexene-3,6-diyl group having a fluorine atom, a cycloheptane-1,4-diyl group having a fluorine atom, and a cyclooctane-1,5-diyl group having a fluorine atom. Examples of the polycyclic cycloalkanediyl group having a fluorine atom include a norbornane-1,4-diyl group having a fluorine atom, a norbornane-2,5-diyl group having a fluorine atom, a 5-norbornene-2,3-diyl group having a fluorine atom, an adamantane-1,5-diyl group having a fluorine atom, and an adamantane-2,6-diyl group having a fluorine atom. L 42f The number of fluorine atoms in the alkanediyl group having a fluorine atom and the cycloalkanediyl group in L may be 1 or more, and is preferably 2 or more. L 42f The alkanediyl group having a fluorine atom and the cycloalkanediyl group in L are preferably a perfluoroalkanediyl group and a perfluorocycloalkanediyl group, respectively.

[0098] L 42fExamples of the perfluoroalkanediyl group in [compound name] include a difluoromethylene group, a perfluoroethylene group, a perfluoroethylfluoromethylene group, a perfluoropropane-1,3-diyl group, a perfluoropropane-1,2-diyl group, a perfluoropropane-2,2-diyl group, a perfluorobutane-1,4-diyl group, a perfluorobutane-2,2-diyl group, a perfluorobutane-1,2-diyl group, a perfluoropentane-1,5-diyl group, a perfluoropentane-2,2-diyl group, a perfluoropentane-3,3-diyl group, a perfluorohexane-1,6-diyl group, a perfluorohexane-2,2-diyl group, a perfluorohexane-3,3-diyl group, a perfluoroheptane-1,7-diyl group, a perfluoroheptane-2,2-diyl group, a perfluoroheptane-3,4-diyl group, a perfluoroheptane-4,4-diyl group, a perfluorooctane-1,8-diyl group, a perfluorooctane-2,2-diyl group, a perfluorooctane-3,3-diyl group, a perfluorooctane-4,4-diyl group, and the like. L 42f Examples of the perfluorocycloalkanediyl group in [compound name] include a perfluorocyclohexanediyl group, a perfluorocyclopentanediyl group, a perfluorocycloheptanediyl group, a perfluoroadamantanediyl group, and the like.

[0099] L 41 is preferably a single bond or an alkanediyl group having 1 to 3 carbon atoms, more preferably a single bond, a methylene group or an ethylene group, and even more preferably a single bond or a methylene group. L 42f is preferably a perfluoroalkanediyl group having 1 to 8 carbon atoms or a perfluorocycloalkanediyl group having 3 to 12 carbon atoms, more preferably a perfluoroalkanediyl group having 1 to 6 carbon atoms, and even more preferably a perfluoroalkanediyl group having 1 to 3 carbon atoms.

[0100] Examples of the structural unit (a4-1) include the structural units shown below and the R in the structural unit (a4-1) in the following structural units. 41Examples of the structural unit include those in which the methyl group corresponding thereto is replaced with a hydrogen atom. TIFF2025113197000077.tif55167 The structural unit represented by formula (a4-2) is the structural unit shown below. TIFF2025113197000078.tif33101 [In formula (a4-2), R 41 represents a hydrogen atom or a methyl group. L 43f represents an aliphatic hydrocarbon group having 1 to 20 carbon atoms which may have a fluorine atom, and -CH2- contained in the aliphatic hydrocarbon group may be replaced with -O- or -CO-. R 43f represents an aliphatic hydrocarbon group having 1 to 20 carbon atoms which may have a fluorine atom, and -CH2- contained in the aliphatic hydrocarbon group may be replaced with -O- or -CO-. However, at least one of L 43f and R 43f has a fluorine atom, and the upper limit of the total number of carbon atoms of L 43f and R 43f is 21.]

[0101] L 43f and R 43f Examples of the aliphatic hydrocarbon group in include linear or branched chain hydrocarbon groups, monocyclic or polycyclic alicyclic hydrocarbon groups, and groups formed by combining these. Examples of the aliphatic hydrocarbon group in L 43f and R 43f include, as long as the upper limit of the total number of carbon atoms of L 43f and R 43f permits, groups similar to the aliphatic hydrocarbon group of R 42 in formula (a4).

[0102] L 43f The aliphatic hydrocarbon group of is preferably an alkanediyl group having 1 to 6 carbon atoms or a group represented by formula (L43f-1). TIFF2025113197000079.tif13120 [In formula (L43f-1), s represents 0 or 1. L 45f and L 46f each independently represents a divalent aliphatic hydrocarbon group having 1 to 5 carbon atoms which may have a fluorine atom. L 47f represents a single bond or a divalent aliphatic hydrocarbon group having 1 to 5 carbon atoms which may have a fluorine atom. X 46f and X 47f each independently represents -O-, -CO-, -CO-O- or -O-CO-. However, the total number of carbon atoms of L 45f , L 46f , L 47f , X 46f and X 47f is 7 or less. * and ** are bonding sites, and ** is the bonding site with -O-CO-R 43f .

[0103] In the group represented by formula (L43f-1), L 45f , L 46f and L 47f Examples of the divalent aliphatic hydrocarbon group represented include a linear or branched alkanediyl group, a monocyclic or polycyclic divalent alicyclic hydrocarbon group, and a divalent aliphatic hydrocarbon group formed by combining an alkanediyl group and a divalent alicyclic hydrocarbon group. Specifically, a methylene group, an ethylene group, a propane-1,3-diyl group, a propane-1,2-diyl group, a butane-1,4-diyl group, a 1-methylpropane-1,3-diyl group, a 2-methylpropane-1,3-diyl group, a 2-methylpropane-1,2-diyl group, etc. may be mentioned. s is preferably 0.

[0104] Examples of the group represented by formula (L43f-1) include the following groups. In the following examples, * and ** each represent a bonding site, and ** is the bonding site with -O-CO-R 43f . TIFF2025113197000080.tif47140

[0105] R43f An aliphatic hydrocarbon group having a fluorine atom is preferred. The structural unit represented by the formula (a4-2) in this case includes, for example, the structural unit represented by the formula (a4-2A) or (formula a4-2B). TIFF2025113197000081.tif41157 [In the formula (a4-2A) and the formula (a4-2B), R 41 and L 43f represent the same as those in the formula (a4-2). R 43fA represents an aliphatic hydrocarbon group having 1 to 20 carbon atoms and having a fluorine atom. A 43f represents a divalent aliphatic hydrocarbon group having 1 to 17 carbon atoms which may have a fluorine atom, and -CH2- contained in the aliphatic hydrocarbon group may be replaced by -O- or -CO-. X 43 represents **-O-CO- or **-CO-O-, and ** represents the bonding site with A 43f R 43fB represents an aliphatic hydrocarbon group having 1 to 17 carbon atoms which may have a fluorine atom. However, in the formula (a4-2A), the total number of carbon atoms of L 43f and R 43fA is 21 or less, and in the formula (a4-2B), the total number of carbon atoms of L 43f , A 43f , X 43 and R 43fB is 21 or less, and at least one of A 43f and R 43fB has at least one fluorine atom. R 43fA The aliphatic hydrocarbon group of R 42 includes the same aliphatic hydrocarbon group as the aliphatic hydrocarbon group exemplified by R R 43fA is preferably an alkyl group having a fluorine atom and having 1 to 13 carbon atoms, a cycloalkyl group having a fluorine atom and having 3 to 12 carbon atoms, or a group combining them, *-(CF2) n43f -R 42’ ​(* represents the bonding site with the carbonyl group. n43f represents an integer from 1 to 6. R 42’ represents a hydrogen atom or a fluorine atom.) or a perfluorocycloalkyl group having 3 to 12 carbon atoms is more preferable. A 43f and R 43fB 's aliphatic hydrocarbon group, as long as the upper limit of the number of carbon atoms permits, is the same as the aliphatic hydrocarbon group exemplified by R 42 in formula (a4). A 43f is preferably a divalent chain hydrocarbon group, a divalent alicyclic hydrocarbon group or a combination thereof which may have a fluorine atom, more preferably a divalent chain hydrocarbon group having a fluorine atom, and even more preferably a fluoroalkanediyl group having 1 to 6 carbon atoms. R 43fB 's aliphatic hydrocarbon group which may have a fluorine atom is preferably a chain hydrocarbon group, an alicyclic hydrocarbon group or a combination thereof which may have a fluorine atom, more preferably an alkyl group having 1 to 12 carbon atoms, a cycloalkyl group having 3 to 12 carbon atoms or a combination thereof which may have a fluorine atom, and even more preferably a trifluoromethyl group, a difluoromethyl group, a methyl group, a perfluoroethyl group, a 2,2,2-trifluoroethyl group, a 1,1,2,2-tetrafluoroethyl group, an ethyl group, a perfluoropropyl group, a 2,2,3,3,3-pentafluoropropyl group, a propyl group, a perfluorobutyl group, a 1,1,2,2,3,3,4,4-octafluorobutyl group, a butyl group, a perfluoropentyl group, a 2,2,3,3,4,4,5,5,5-nonafluoropentyl group, a pentyl group, a hexyl group, a perfluorohexyl group, a heptyl group, a perfluoroheptyl group, an octyl group and a perfluorooctyl group and other fluoroalkyl groups, a cyclopropylmethyl group, a cyclopropyl group, a cyclobutylmethyl group, a cyclopentyl group, a cyclohexyl group, a perfluorocyclohexyl group, an adamantyl group, an adamantylmethyl group, an adamantyldimethyl group, a norbornyl group, a norbornylmethyl group, a perfluoroadamantyl group, a perfluoroadamantylmethyl group and the like.

[0106] In formula (a4-2B), *-A 43f -X 43 -R 43fB An example of the structure that the group represented by can take is the following structure (* is the bonding site with the carbonyl group). TIFF2025113197000082.tif15170

[0107] As the structural unit represented by formula (a4-2A), the following structural units and the R in the structural unit represented by formula (a4-2A) in the following structural units 41 include the structural unit in which the methyl group corresponding to is replaced by a hydrogen atom. TIFF2025113197000083.tif99167

[0108] As the structural unit represented by formula (a4-2B), the following structural units and the R in the structural unit represented by formula (a4-2B) in the following structural units 41 include the structural unit in which the methyl group corresponding to is replaced by a hydrogen atom. TIFF2025113197000084.tif111164

[0109] As the structural unit (a4), the structural unit represented by formula (a4-3) is also included. TIFF2025113197000085.tif3689[In formula (a4-3), R 41 represents a hydrogen atom or a methyl group. L 44f represents an aliphatic hydrocarbon group having 1 to 20 carbon atoms which may have a fluorine atom, and -CH2- contained in the aliphatic hydrocarbon group may be replaced by -O- or -CO-. R 44f represents an aliphatic hydrocarbon group having 1 to 20 carbon atoms which may have a fluorine atom, and -CH2- contained in the aliphatic hydrocarbon group may be replaced by -O- or -CO-. However, at least one of 44f L 44f and R 44f has a fluorine atom, and L44f The upper limit of the total carbon number is 21.

[0110] L 44f and R 44f Examples of the aliphatic hydrocarbon group in L 44f and R 44f include linear or branched chain aliphatic hydrocarbon groups, monocyclic or polycyclic alicyclic hydrocarbon groups, and groups formed by combining these, etc. 44f and R 44f As long as the upper limit of the total carbon number in L 42 and R permits, examples of the aliphatic hydrocarbon group of R in formula (a4) include the same groups as the aliphatic hydrocarbon groups exemplified. L 44f is preferably an alkanediyl group having 1 to 14 carbon atoms (wherein -CH2- contained in the alkanediyl group may be replaced by -O- or -CO-), and is more preferably a group represented by -(CH2) j1 -, -(CH2) j2 -O-(CH2) j3 -, or -(CH2) j4 -CO-O-(CH2) j5 - (where j1 to j5 each independently represent an integer of 1 to 6). Further preferably, it is an alkanediyl group having 1 to 4 carbon atoms (wherein one -CH2- contained in the alkanediyl group may be replaced by -O-, and one -CH2-CH2- contained in the alkanediyl group may be replaced by -CO-O- or -O-CO-). R 44f is preferably an aliphatic hydrocarbon group having 1 to 10 carbon atoms having a fluorine atom, more preferably an alkyl group having 1 to 10 carbon atoms having a fluorine atom, an alicyclic hydrocarbon group having 3 to 10 carbon atoms having a fluorine atom, or a group combining them, still more preferably an alkyl group having 1 to 10 carbon atoms having a fluorine atom, and even more preferably an alkyl group having 1 to 6 carbon atoms having a fluorine atom.

[0111] Examples of the structural unit represented by formula (a4-3) include structural units represented by the following structural units and the following formulas, in which the methyl group corresponding to R in structural unit (a4-3) is replaced by a hydrogen atom. 41 Examples thereof include a structural unit in which the methyl group corresponding to R is replaced by a hydrogen atom. TIFF2025113197000086.tif85170

[0112] Examples of the structural unit (a4) also include a structural unit represented by formula (a4-A). TIFF2025113197000087.tif3674[In formula (a4-A), R 44 represents a hydrogen atom, a halogen atom, or an alkyl group having 1 to 6 carbon atoms which may have a halogen atom. X 44 represents a single bond or *-CO-O-. * represents the bonding site with the carbon atom to which R 44 is bonded. L 44 represents an aliphatic hydrocarbon group having 1 to 28 carbon atoms which may have a substituent, and -CH2- contained in the aliphatic hydrocarbon group may be replaced by -O-, -S-, -SO2-, -SO- or -CO-. R 45 represents a fluorinated alkyl group having 1 to 8 carbon atoms. R 46 represents a hydrogen atom or a fluorinated alkyl group having 1 to 6 carbon atoms, and the fluorinated alkyl group may be bonded to L 44 to form an alicyclic hydrocarbon group having 3 to 12 carbon atoms, and -CH2- contained in the alicyclic hydrocarbon group may be replaced by -O-. mi represents any integer from 1 to 4. When mi is 2 or more, the groups in the plurality of parentheses may be the same as or different from each other.]

[0113] R 44 Examples of the halogen atom and the alkyl group which may have a halogen atom in R are the same as those exemplified by R of formula (a1-0) to formula (a1-2). a01 R a4 R a5 and the like. R 44 is preferably a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, more preferably a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, still more preferably a hydrogen atom, a methyl group or an ethyl group, and even more preferably a hydrogen atom or a methyl group.

[0114] L 44 Examples of the aliphatic hydrocarbon group in L include a chain hydrocarbon group, an alicyclic hydrocarbon group which is monocyclic or polycyclic (including a spiro ring, a condensed ring, a bridged ring, etc.), and a group formed by combining two or more of these groups (for example, a hydrocarbon group formed from an alicyclic hydrocarbon group and a chain hydrocarbon group) may also be used. Examples of the chain hydrocarbon group include divalent to pentavalent chain hydrocarbon groups such as an alkanediyl group, an alkanetriyl group, an alkanetetrayl group, and an alkanepentayl group. Examples of the alkanediyl group include linear alkanediyl groups such as a methylene group, an ethylene group, a propane-1,3-diyl group, a butane-1,4-diyl group, a pentane-1,5-diyl group, a hexane-1,6-diyl group, a heptane-1,7-diyl group, an octane-1,8-diyl group, a nonane-1,9-diyl group, a decane-1,10-diyl group, an undecane-1,11-diyl group, a dodecane-1,12-diyl group, a tridecane-1,13-diyl group, a tetradecane-1,14-diyl group, a pentadecane-1,15-diyl group, a hexadecane-1,16-diyl group, and a heptadecane-1,17-diyl group, and branched alkanediyl groups such as an ethane-1,1-diyl group, a propane-1,1-diyl group, a propane-1,2-diyl group, a propane-2,2-diyl group, a pentane-2,4-diyl group, a 2-methylpropane-1,3-diyl group, a 2-methylpropane-1,2-diyl group, a pentane-1,4-diyl group, and a 2-methylbutane-1,4-diyl group. Also, groups in which one or more hydrogen atoms of the above-described groups are replaced at the bonding site are also included. The number of carbon atoms in the chain hydrocarbon group is preferably from 1 to 18, more preferably from 1 to 12, still more preferably from 1 to 10, even more preferably from 1 to 9, yet even more preferably from 1 to 8, still even more preferably from 1 to 6, yet even more preferably from 1 to 5, and particularly preferably from 1 to 4.

[0115] Examples of the monocyclic or polycyclic alicyclic hydrocarbon group include the following alicyclic hydrocarbon groups and the like. The bonding site can be at any position. TIFF2025113197000088.tif45164For example, divalent to pentavalent alicyclic hydrocarbon groups such as cycloalkanediyl groups, cycloalkanetriyl groups, cycloalkanetetrayl groups, cycloalkanepentayl groups and the like can be mentioned. Specifically, monocyclic alicyclic hydrocarbon groups such as cyclobutane-1,3-diyl group, cyclopentane-1,3-diyl group, cyclohexane-1,4-diyl group, cyclooctane-1,5-diyl group and Polycyclic alicyclic hydrocarbon groups such as norbornane-1,4-diyl group, norbornane-2,5-diyl group, adamantane-1,5-diyl group, adamantane-2,6-diyl group, decahydronaphthalenediyl group, bicyclo[3.3.0]octanediy group, spirocyclohexane-1,2'-cyclopentane-diyl group, spiroadamantane-2,3'-cyclopentane-diyl group and the like, which are cycloalkanediyl groups, norbornanediyl groups or adamantanediyl groups each having a spiro-bonded cycloalkanediyl group, can be mentioned. In addition, groups in which one or more hydrogen atoms of the above-mentioned groups are replaced by a bonding site and the like can also be mentioned. The number of carbon atoms in the alicyclic hydrocarbon group is preferably from 3 to 20, more preferably from 3 to 18, still more preferably from 3 to 16, and even more preferably from 3 to 12.

[0116] Examples of a group formed by combining two or more groups include a group formed by combining an alicyclic hydrocarbon group and a chain hydrocarbon group. In the combination, two or more alicyclic hydrocarbon groups and two or more chain hydrocarbon groups may be combined respectively. Also, any group may be bonded to X 11 . Examples of a group formed by combining an alicyclic hydrocarbon group and a chain hydrocarbon group include a group in which an alicyclic hydrocarbon group is bonded to a chain hydrocarbon group (e.g., *-chain hydrocarbon group-alicyclic hydrocarbon group-), a group in which a chain hydrocarbon group is bonded to an alicyclic hydrocarbon group (e.g., *-alicyclic hydrocarbon group-chain hydrocarbon group-), a group in which an alicyclic hydrocarbon group and a chain hydrocarbon group are bonded to a chain hydrocarbon group (e.g., *-chain hydrocarbon group-alicyclic hydrocarbon group-chain hydrocarbon group-), a group in which a chain hydrocarbon group and an alicyclic hydrocarbon group are bonded to an alicyclic hydrocarbon group (e.g., *-alicyclic hydrocarbon group-chain hydrocarbon group-alicyclic hydrocarbon group-), a group in which an alicyclic hydrocarbon group, a chain hydrocarbon group, and an alicyclic hydrocarbon group are bonded to a chain hydrocarbon group (e.g., *-chain hydrocarbon group-alicyclic hydrocarbon group-chain hydrocarbon group-alicyclic hydrocarbon group-), a group in which a chain hydrocarbon group, an alicyclic hydrocarbon group, and a chain hydrocarbon group are bonded to an alicyclic hydrocarbon group (e.g., *-alicyclic hydrocarbon group-chain hydrocarbon group-alicyclic hydrocarbon group-chain hydrocarbon group-), etc. * represents the bonding site to X 11 . Examples also include a group in which one or more hydrogen atoms of the above-described group are replaced with a bonding site, etc.

[0117] L 1 The -CH2- contained in the aliphatic hydrocarbon group having 1 to 28 carbon atoms of may be replaced with -O-, -S-, -SO-, -SO2- or -CO-. L 1 When the -CH2- contained in the aliphatic hydrocarbon group having 1 to 28 carbon atoms of is replaced with -O-, -S-, -SO-, -SO2- or -CO-, the number of carbon atoms before replacement is taken as the number of carbon atoms of the aliphatic hydrocarbon group. Examples of the group in which -CH2- contained in the aliphatic hydrocarbon group is replaced by -O-, -S-, -SO2-, -SO- or -CO- include a hydroxy group, a carboxy group, a thiol group, an alkoxy group, an alkylthio group, an alkoxycarbonyl group, an alkylsulfonyl group, an alkylcarbonyl group, an alkylcarbonyloxy group, an alkoxycarbonyloxy group, an oxy group, a carbonyl group, a thio group, a sulfonyl group, an alkanedioxy group, an alkanedioxycarbonyl group, an alkanediylcarbonyl group, an alkanediylcarbonyloxy group, an alkanediylsulfonyl group, an alkanediylthio group, a cycloalkoxy group, a cycloalkylalkoxy group, a group formed by combining two or more of these groups, and the like. These replaced groups include those similar to the groups exemplified in this specification as long as the upper limit of the number of carbon atoms permits. Examples also include a group in which one or more hydrogen atoms of the above-described group are replaced by a bonding site, and the like. Examples of the group in which -CH2- contained in the alicyclic hydrocarbon group is replaced by -O-, -S-, -CO- or -SO2- include those similar to the groups exemplified in this specification as long as the upper limit of the number of carbon atoms permits.

[0118] L 44 The aliphatic hydrocarbon group in [group name] may have one or more substituents. Examples of the substituent include a halogen atom, a haloalkyl group having 1 to 4 carbon atoms, an alkyl group having 1 to 12 carbon atoms, an alicyclic hydrocarbon group having 3 to 18 carbon atoms, or an aromatic hydrocarbon group having 6 to 18 carbon atoms (the -CH2- contained in the alkyl group or the alicyclic hydrocarbon group may be replaced by -O- or -CO-). Examples of the halogen atom include a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, and the like. The haloalkyl groups having 1 to 4 carbon atoms include fluoroalkyl groups having 1 to 4 carbon atoms, chloroalkyl groups having 1 to 4 carbon atoms, bromoalkyl groups having 1 to 4 carbon atoms, iodoalkyl groups having 1 to 4 carbon atoms, and the like. Examples of the haloalkyl group include perfluoroalkyl groups having 1 to 4 carbon atoms (such as trifluoromethyl group, pentafluoroethyl group, heptafluoropropyl group, nonafluorobutyl group, etc.), 2,2,2-trifluoroethyl group, 3,3,3-trifluoropropyl group, 4,4,4-trifluorobutyl group, 3,3,4,4,4-pentafluorobutyl group, chloromethyl group, bromomethyl group, iodomethyl group, and the like. The number of carbon atoms of the haloalkyl group is preferably 1 to 3, more preferably 1 or 2. Examples of the alkyl group having 1 to 12 carbon atoms include methyl group, ethyl group, propyl group, butyl group, pentyl group, hexyl group, heptyl group, octyl group, nonyl group, decyl group, undecyl group, dodecyl group, and the like. The number of carbon atoms of the alkyl group is preferably 1 to 9, more preferably 1 to 6, still more preferably 1 to 4, and even more preferably 1 to 3. Examples of the alicyclic hydrocarbon group having 3 to 18 carbon atoms include monocyclic cycloalkyl groups such as cyclopropyl group, cyclobutyl group, cyclopentyl group, cyclohexyl group, cycloheptyl group, cyclooctyl group, cyclodecyl group, and polycyclic cycloalkyl groups such as decahydronaphthyl group, adamantyl group, norbornyl group, and the like. The number of carbon atoms of the alicyclic hydrocarbon group is preferably 3 to 16, more preferably 3 to 12, and still more preferably 3 to 10. Examples of the aromatic hydrocarbon group having 6 to 18 carbon atoms include phenyl group, naphthyl group, biphenyl group, anthryl group, phenanthryl group, binaphthyl group, and the like. The number of carbon atoms of the aromatic hydrocarbon group is preferably 6 to 14, more preferably 6 to 12, and still more preferably 6 to 10. When -CH2- contained in an alkyl group is replaced by -O- or -CO-, the number of carbon atoms before replacement is defined as the total number of carbon atoms of the alkyl group. Examples of the replacing group include a hydroxy group, a carboxy group, an alkoxy group, an alkoxycarbonyl group, an alkylcarbonyl group, an alkylcarbonyloxy group, an alkoxycarbonyloxy group, etc. These replacing groups include those similar to the groups exemplified in this specification as long as the upper limit of the number of carbon atoms permits. The number of carbon atoms of the alkoxy group is preferably from 1 to 9, more preferably from 1 to 6, still more preferably from 1 to 4, and even more preferably from 1 to 3. The number of carbon atoms of the alkoxycarbonyl group is preferably from 2 to 9, more preferably from 2 to 6, still more preferably from 2 to 4, and even more preferably 2 or 3. The number of carbon atoms of the alkylcarbonyl group is preferably from 2 to 10, more preferably from 2 to 6, still more preferably from 2 to 4, and even more preferably 2 or 3. The number of carbon atoms of the alkylcarbonyloxy group is preferably from 2 to 9, more preferably from 2 to 6, still more preferably from 2 to 4, and even more preferably 2 or 3. In addition, examples of the group in which -CH2- contained in the alicyclic hydrocarbon group is replaced by -O- or -CO- include those similar to the groups exemplified in this specification as long as the upper limit of the number of carbon atoms permits. L 44 The substituent that the aliphatic hydrocarbon group in L may have includes a halogen atom, a haloalkyl group having 1 to 3 carbon atoms, an alkyl group having 1 to 6 carbon atoms, an alicyclic hydrocarbon group having 3 to 10 carbon atoms, or an aromatic hydrocarbon group having 6 to 10 carbon atoms (wherein -CH2- contained in the alkyl group or the alicyclic hydrocarbon group may be replaced by -O- or -CO-). A fluorine atom, an iodine atom, a perfluoroalkyl group having 1 to 3 carbon atoms, or an alkyl group having 1 to 4 carbon atoms (wherein -CH2- contained in the alkyl group may be replaced by -O- or -CO-) is more preferable, and a fluorine atom, an iodine atom, a trifluoromethyl group, a methyl group, a hydroxy group, or a methoxy group is still more preferable. L 44 is R 46When it does not form an alkyl fluoride group and an alicyclic hydrocarbon group, an optionally substituted chain hydrocarbon group having 1 to 12 carbon atoms (the -CH2- contained in the chain hydrocarbon group may be replaced by -O- or -CO-), an optionally substituted alicyclic hydrocarbon group having 3 to 18 carbon atoms (the -CH2- contained in the alicyclic hydrocarbon group may be replaced by -O- or -CO-), or a group formed by combining an optionally substituted chain hydrocarbon group having 1 to 6 carbon atoms and an optionally substituted alicyclic hydrocarbon group having 3 to 18 carbon atoms (the -CH2- contained in the chain hydrocarbon group may be replaced by -O- or -CO-, and the -CH2- contained in the alicyclic hydrocarbon group may be replaced by -O- or -CO-) is preferable, an optionally substituted chain hydrocarbon group having 1 to 8 carbon atoms (the -CH2- contained in the chain hydrocarbon group may be replaced by -O- or -CO-), an optionally substituted alicyclic hydrocarbon group having 3 to 12 carbon atoms, or a group formed by combining an optionally substituted chain hydrocarbon group having 1 to 6 carbon atoms and an optionally substituted alicyclic hydrocarbon group having 3 to 18 carbon atoms (the -CH2- contained in the chain hydrocarbon group may be replaced by -O- or -CO-) is more preferable, an optionally substituted chain hydrocarbon group having 1 to 8 carbon atoms (the -CH2- contained in the chain hydrocarbon group may be replaced by -O- or -CO-), an optionally substituted alicyclic hydrocarbon group having 5 to 12 carbon atoms, a group formed by combining a chain hydrocarbon group having 1 to 6 carbon atoms and an optionally substituted alicyclic hydrocarbon group having 5 to 12 carbon atoms (the -CH2- contained in the chain hydrocarbon group may be replaced by -O- or -CO-), or a group formed by combining an optionally substituted alicyclic hydrocarbon group having 5 to 12 carbon atoms, a chain hydrocarbon group having 1 to 6 carbon atoms, and an optionally substituted alicyclic hydrocarbon group having 5 to 12 carbon atoms (the -CH2- contained in the chain hydrocarbon group may be replaced by -O- or -CO-) is even more preferable.

[0119] R 45Examples of the C1-C8 fluoroalkyl group in [text] include difluoromethyl group, trifluoromethyl group, 1,1-difluoroethyl group, 2,2-difluoroethyl group, 2,2,2-trifluoroethyl group, perfluoroethyl group, 1,1,2,2-tetrafluoropropyl group, 1,1,2,2,3,3-hexafluoropropyl group, perfluoroethylmethyl group, 1-(trifluoromethyl)-1,2,2,2-tetrafluoroethyl group, perfluoropropyl group, 1,1,2,2-tetrafluorobutyl group, 1,1,2,2,3,3-hexafluorobutyl group, 1,1,2,2,3,3,4,4-octafluorobutyl group, perfluorobutyl group, 1,1-bis(trifluoro)methyl-2,2,2-trifluoroethyl group, 2-(perfluoropropyl)ethyl group, 1,1,2,2,3,3,4,4-octafluoropentyl group, perfluoropentyl group, 1,1,2,2,3,3,4,4,5,5-decafluoropentyl group, 1,1-bis(trifluoromethyl)-2,2,3,3,3-pentafluoropropyl group, perfluoropentyl group, 2-(perfluorobutyl)ethyl group, 1,1,2,2,3,3,4,4,5,5-decafluorohexyl group, 1,1,2,2,3,3,4,4,5,5,6,6-dodecafluorohexyl group, perfluoropentylmethyl group, perfluorohexyl group, perfluoroheptyl group, perfluorooctyl group. The number of carbon atoms of the fluoroalkyl group is preferably 1-6, more preferably 1-5, still more preferably 1-4, and even more preferably 1-3. R 46 The C1-C6 fluoroalkyl group in [text], as long as the upper limit of the number of carbon atoms permits, includes the C1-C6 fluoroalkyl groups exemplified for the fluoroalkyl group of R 45 similarly. R 45 is preferably a C1-C6 fluoroalkyl group, more preferably a C1-C3 fluoroalkyl group, still more preferably a trifluoromethyl group, a perfluoroethyl group or a perfluoropropyl group, and even more preferably a trifluoromethyl group when R 46 is a C1-C6 fluoroalkyl group. R45 is, when R 46 is a hydrogen atom, preferably an alkyl fluoride group having 1 to 6 carbon atoms, more preferably an alkyl fluoride group having 1 to 5 carbon atoms, and still more preferably an alkyl fluoride group having 3 to 5 carbon atoms. R 46 is bonded to L 44 to form an alicyclic hydrocarbon group having 3 to 12 carbon atoms, R 46 is bonded to L 44 Examples of the group formed by the bond include groups represented by the following formulae. In the following formulae, * and ** represent bonding sites, and two **, one represents the bonding site with a hydroxy group and the other represents the bonding site with R 45 L 44A is a part of the hydrocarbon group of L 44 and represents a single bond or an alkanediyl group having 1 to 4 carbon atoms. The carbon number of the alicyclic hydrocarbon group formed by the bond between R 46 and L 44 is preferably 3 to 10, more preferably 3 to 8, and still more preferably 3 to 6. TIFF2025113197000089.tif22138R 46 is preferably a hydrogen atom or an alkyl fluoride group having 1 to 3 carbon atoms. mi is preferably any integer from 1 to 3, more preferably 1 or 2, and still more preferably 1.

[0120] Examples of the structural unit (a4-A) include the following structural units and the like. In the following structural units, structural units in which the methyl group corresponding to R 44 is replaced with a hydrogen atom, a halogen atom, a haloalkyl group or an alkyl group other than a methyl group, and structural units in which the hydrogen atom corresponding to R 44 is replaced with a halogen atom, a haloalkyl group or an alkyl group can also be cited as specific examples of the structural unit (a4-A). TIFF2025113197000090.tif192167

[0121] When the resin (A) etc. contains the structural unit (a4), its content is preferably 1 to 20 mol%, more preferably 2 to 15 mol%, and still more preferably 3 to 10 mol% with respect to all the structural units of the resin (A) etc.

[0122] 〈Structural unit (a5)〉 Examples of the non-leaving hydrocarbon group possessed by the structural unit (a5) include groups having a linear, branched or cyclic hydrocarbon group. Among them, the structural unit (a5) preferably has a group having an alicyclic hydrocarbon group. Examples of the structural unit (a5) include a structural unit represented by the formula (a5-1). TIFF2025113197000091.tif3971[In the formula (a5-1), R 51 represents a hydrogen atom or a methyl group. R 52 represents an alicyclic hydrocarbon group having 3 to 18 carbon atoms, and the hydrogen atoms contained in the alicyclic hydrocarbon group may be substituted with an aliphatic hydrocarbon group having 1 to 8 carbon atoms. L 55 represents a single bond or a divalent saturated hydrocarbon group having 1 to 18 carbon atoms, and -CH2- contained in the saturated hydrocarbon group may be replaced by -O- or -CO-.]

[0123] R 52 The alicyclic hydrocarbon group in R may be either monocyclic or polycyclic. Examples of the monocyclic alicyclic hydrocarbon group include a cyclopropyl group, a cyclobutyl group, a cyclopentyl group and a cyclohexyl group. Examples of the polycyclic alicyclic hydrocarbon group include an adamantyl group and a norbornyl group etc. Examples of the aliphatic hydrocarbon group having 1 to 8 carbon atoms include alkyl groups such as a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, a sec-butyl group, a tert-butyl group, a pentyl group, a hexyl group, an octyl group and a 2-ethylhexyl group. Examples of the alicyclic hydrocarbon group having a substituent include a 3-methyladamantyl group etc. R 52is preferably an unsubstituted alicyclic hydrocarbon group having 3 to 18 carbon atoms, more preferably an adamantyl group, a norbornyl group or a cyclohexyl group. L 55 Examples of the divalent saturated hydrocarbon group in include divalent chain saturated hydrocarbon groups and divalent alicyclic saturated hydrocarbon groups, preferably divalent chain saturated hydrocarbon groups. Examples of the divalent chain saturated hydrocarbon group include alkane diyl groups such as methylene group, ethylene group, propane diyl group, butane diyl group and pentane diyl group. The divalent alicyclic saturated hydrocarbon group may be either monocyclic or polycyclic. Examples of the monocyclic alicyclic saturated hydrocarbon group include cycloalkane diyl groups such as cyclopentane diyl group and cyclohexane diyl group. Examples of the polycyclic divalent alicyclic saturated hydrocarbon group include adamantane diyl group and norbornane diyl group.

[0124] L 55 Examples of the group in which -CH2- contained in the divalent saturated hydrocarbon group represented by is replaced by -O- or -CO- include the groups represented by formula (L1-1) to formula (L1-4). In the following formulas, * and ** each represent a bonding site, and * represents a bonding site with an oxygen atom. TIFF2025113197000092.tif18165[In formula (L1-1), X x1 represents *-O-CO- or *-CO-O- (* represents the bonding site with L x1 ). L x1 represents a divalent aliphatic saturated hydrocarbon group having 1 to 16 carbon atoms. L x2 represents a single bond or a divalent aliphatic saturated hydrocarbon group having 1 to 15 carbon atoms. However, the total number of carbon atoms of L x1 and L x2 is 16 or less. In formula (L1-2), L x3 represents a divalent aliphatic saturated hydrocarbon group having 1 to 17 carbon atoms. L x4represents a single bond or a divalent aliphatic saturated hydrocarbon group having 1 to 16 carbon atoms. However, the total number of carbon atoms in L x3 and L x4 is 17 or less. In formula (L1-3), L x5 represents a divalent aliphatic saturated hydrocarbon group having 1 to 15 carbon atoms. L x6 and L x7 each independently represent a single bond or a divalent aliphatic saturated hydrocarbon group having 1 to 14 carbon atoms. However, the total number of carbon atoms in L x5 , L x6 and L x7 is 15 or less. In formula (L1-4), L x8 and L x9 represent a single bond or a divalent aliphatic saturated hydrocarbon group having 1 to 12 carbon atoms. W x1 represents a divalent alicyclic saturated hydrocarbon group having 3 to 15 carbon atoms. However, the total number of carbon atoms in L x8 , L x9 and W x1 is 15 or less. L x1 is preferably a divalent aliphatic saturated hydrocarbon group having 1 to 8 carbon atoms, more preferably a methylene group or an ethylene group. L x2 is preferably a single bond or a divalent aliphatic saturated hydrocarbon group having 1 to 8 carbon atoms, more preferably a single bond. L x3 is preferably a divalent aliphatic saturated hydrocarbon group having 1 to 8 carbon atoms. L x4 is preferably a single bond or a divalent aliphatic saturated hydrocarbon group having 1 to 8 carbon atoms. L x5 is preferably a divalent aliphatic saturated hydrocarbon group having 1 to 8 carbon atoms, more preferably a methylene group or an ethylene group. L x6is preferably a single bond or a divalent aliphatic saturated hydrocarbon group having 1 to 8 carbon atoms, more preferably a methylene group or an ethylene group. L x7 is preferably a single bond or a divalent aliphatic saturated hydrocarbon group having 1 to 8 carbon atoms. L x8 is preferably a single bond or a divalent aliphatic saturated hydrocarbon group having 1 to 8 carbon atoms, more preferably a single bond or a methylene group. L x9 is preferably a single bond or a divalent aliphatic saturated hydrocarbon group having 1 to 8 carbon atoms, more preferably a single bond or a methylene group. W x1 is preferably a divalent alicyclic saturated hydrocarbon group having 3 to 10 carbon atoms, more preferably a cyclohexanediyl group or an adamantanediyl group.

[0125] Examples of the group represented by the formula (L1-1) include the following divalent groups. TIFF2025113197000093.tif37147 Examples of the group represented by the formula (L1-2) include the following divalent groups. TIFF2025113197000094.tif23130 Examples of the group represented by the formula (L1-3) include the following divalent groups. TIFF2025113197000095.tif16147 Examples of the group represented by the formula (L1-4) include the following divalent groups. TIFF2025113197000096.tif13168L 55 is preferably a single bond or a group represented by the formula (L1-1).

[0126] Examples of the structural unit (a5-1) include the following structural units and the structural units in which the methyl group corresponding to R in the following structural units in the structural unit (a5-1) is replaced by a hydrogen atom. 51 are mentioned. When resin (A) etc. contains structural unit (a5), its content is preferably 1 to 30 mol%, more preferably 2 to 20 mol%, still more preferably 3 to 15 mol% with respect to all the structural units of resin (A) etc.

[0127] 〈Structural unit (a6)〉 Structural unit (a6) is a structural unit having a -SO2- group, and preferably has a -SO2- group in the side chain. The structural unit having a -SO2- group may have a linear structure having a -SO2- group, a branched structure having a -SO2- group, or a cyclic structure (monocyclic and polycyclic structures) having a -SO2- group. Preferably, it is a structural unit having a cyclic structure having a -SO2- group, and more preferably, it is a structural unit having a cyclic structure (sultone ring) containing -SO2-O-.

[0128] Examples of the sultone ring include the rings represented by the following formula (T 1 -1), formula (T 1 -2), formula (T 1 -3) and formula (T 1 -4). The bonding site can be at any position. The sultone ring may be monocyclic, but is preferably polycyclic. The polycyclic sultone ring means a bridged ring containing -SO2-O- as an atomic group constituting the ring, and examples include the rings represented by formula (T 1 -1) and formula (T 1 -2). The sultone ring may further contain a hetero atom in addition to -SO2-O- as an atomic group constituting the ring, like the ring represented by formula (T 1 -2). Examples of the hetero atom include an oxygen atom, a sulfur atom or a nitrogen atom, and preferably an oxygen atom. TIFF2025113197000098.tif3385

[0129] The sultone ring may have a substituent, and examples of the substituent include an alkyl group having 1 to 12 carbon atoms which may have a halogen atom or a hydroxy group, a halogen atom, a hydroxy group, a cyano group, an alkoxy group having 1 to 12 carbon atoms, an aryl group having 6 to 12 carbon atoms, an aralkyl group having 7 to 12 carbon atoms, a glycidyloxy group, an alkoxycarbonyl group having 2 to 12 carbon atoms, and an alkylcarbonyl group having 2 to 4 carbon atoms.

[0130] Examples of the halogen atom include a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom. Examples of the alkyl group include a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group, an octyl group, and a decyl group. Preferably, it is an alkyl group having 1 to 6 carbon atoms, and more preferably a methyl group. Examples of the alkyl group having a halogen atom include a trifluoromethyl group, a perfluoroethyl group, a perfluoropropyl group, a perfluoroisopropyl group, a perfluorobutyl group, a perfluorosec-butyl group, a perfluorotert-butyl group, a perfluoropentyl group, a perfluorohexyl group, a trichloromethyl group, a tribromomethyl group, and a triiodomethyl group. Preferably, a trifluoromethyl group is mentioned. Examples of the alkyl group having a hydroxy group include a hydroxymethyl group and a hydroxyalkyl group such as a 2-hydroxyethyl group. Examples of the alkoxy group include a methoxy group, an ethoxy group, a propoxy group, a butoxy group, a pentyloxy group, a hexyloxy group, a heptyloxy group, an octyloxy group, a decyloxy group, and a dodecyloxy group. Examples of the aryl group include a phenyl group, a naphthyl group, an anthryl group, a p-methylphenyl group, a p-tert-butylphenyl group, a p-adamantylphenyl group, a tolyl group, a xylyl group, a cumyl group, a mesityl group, a biphenyl group, a phenanthryl group, a 2,6-diethylphenyl group, and a 2-methyl-6-ethylphenyl group. Examples of the aralkyl group include a benzyl group, a phenethyl group, a phenylpropyl group, a naphthylmethyl group, and a naphthylethyl group. Examples of the alkoxycarbonyl group include groups in which an alkoxy group such as a methoxycarbonyl group or an ethoxycarbonyl group is bonded to a carbonyl group, preferably an alkoxycarbonyl group having 6 or fewer carbon atoms, more preferably a methoxycarbonyl group. Examples of the alkylcarbonyl group include an acetyl group, a propionyl group, and a butyryl group. From the viewpoint that the production of the monomer leading to the structural unit (a6) is easy, a sultone ring having no substituent is preferred.

[0131] As the sultone ring, a ring represented by the following formula (T1') is preferred. TIFF2025113197000099.tif2865[In the formula (T1'), X 11 represents an oxygen atom, a sulfur atom, or a methylene group. R 41 represents an alkyl group having 1 to 12 carbon atoms which may have a halogen atom or a hydroxy group, a halogen atom, a hydroxy group, a cyano group, an alkoxy group having 1 to 12 carbon atoms, an aryl group having 6 to 12 carbon atoms, an aralkyl group having 7 to 12 carbon atoms, a glycidyloxy group, an alkoxycarbonyl group having 2 to 12 carbon atoms, or an alkylcarbonyl group having 2 to 4 carbon atoms. ma represents any integer from 0 to 9. When ma is 2 or more, a plurality of R 41 may be the same or different. The bonding site is at an arbitrary position.] X 11 is preferably an oxygen atom or a methylene group, more preferably a methylene group. R 41 is exemplified by the same groups as the substituents of the above-described sultone ring, and an alkyl group having 1 to 12 carbon atoms which may have a halogen atom or a hydroxy group is preferred. ma is preferably 0 or 1, more preferably 0.

[0132] Examples of the ring represented by formula (T1’) include the following rings. The bonding site can be at any position. Among them, those in which the bonding site is at the 1-position or 3-position are preferred. TIFF2025113197000100.tif46147

[0133] The structural unit having a -SO2- group preferably further has a group derived from a polymerizable group. Examples of the polymerizable group include a vinyl group, an acryloyl group, a methacryloyl group, an acryloyloxy group, a methacryloyloxy group, an acryloylamino group, a methacryloylamino group, an acryloylthio group, a methacryloylthio group, and the like. Among them, the monomer that leads to the structural unit (a6) is preferably a monomer having an ethylenically unsaturated bond, more preferably a (meth)acrylic monomer.

[0134] The structural unit (a6) is preferably a structural unit represented by formula (a6-0). TIFF2025113197000101.tif4077[In formula (a6-0), R x represents an alkyl group having 1 to 6 carbon atoms which may have a halogen atom, a hydrogen atom, or a halogen atom. A xx represents an oxygen atom, -N(R c )-, or a sulfur atom. A x represents a single bond or a divalent saturated hydrocarbon group having 1 to 18 carbon atoms, and -CH2- contained in the saturated hydrocarbon group may be replaced by -O-, -CO-, or -N(R d )-. X 11 , R 41 and ma have the same meanings as described above. R c and R d each independently represent a hydrogen atom or an alkyl group having 1 to 6 carbon atoms.]

[0135] R x Examples of the halogen atom of R include a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom. R x Examples of the alkyl group of R include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, a sec-butyl group, a tert-butyl group, an n-pentyl group, an n-hexyl group, etc., preferably an alkyl group having 1 to 4 carbon atoms, more preferably a methyl group or an ethyl group. R x Examples of the alkyl group having a halogen atom of R include a trifluoromethyl group, a perfluoroethyl group, a perfluoropropyl group, a perfluoroisopropyl group, a perfluorobutyl group, a perfluorosec-butyl group, a perfluorotert-butyl group, a perfluoropentyl group, a perfluorohexyl group, a trichloromethyl group, a tribromomethyl group, a triiodomethyl group, etc. R x R is preferably a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, more preferably a hydrogen atom, a methyl group or an ethyl group, and still more preferably a hydrogen atom or a methyl group.

[0136] A x Examples of the divalent saturated hydrocarbon group of A include a linear alkanediyl group, a branched alkanediyl group, a monocyclic or polycyclic divalent alicyclic saturated hydrocarbon group, and those obtained by combining two or more of these groups may also be used. Specifically, linear alkanediyl groups such as a methylene group, an ethylene group, a propane-1,3-diyl group, a propane-1,2-diyl group, a butane-1,4-diyl group, a pentane-1,5-diyl group, a hexane-1,6-diyl group, a heptane-1,7-diyl group, an octane-1,8-diyl group, a nonane-1,9-diyl group, a decane-1,10-diyl group, an undecane-1,11-diyl group, a dodecane-1,12-diyl group, a tridecane-1,13-diyl group, a tetradecane-1,14-diyl group, a pentadecane-1,15-diyl group, a hexadecane-1,16-diyl group, a heptadecane-1,17-diyl group, an ethane-1,1-diyl group, a propane-1,1-diyl group, and a propane-2,2-diyl group; Branched alkanediyl groups such as butane-1,3-diyl group, 2-methylpropane-1,3-diyl group, 2-methylpropane-1,2-diyl group, pentane-1,4-diyl group, 2-methylbutane-1,4-diyl group; Monocyclic divalent alicyclic saturated hydrocarbon groups which are cycloalkanediyl groups such as cyclobutane-1,3-diyl group, cyclopentane-1,3-diyl group, cyclohexane-1,4-diyl group, cyclooctane-1,5-diyl group; Polycyclic divalent alicyclic saturated hydrocarbon groups such as norbornane-1,4-diyl group, norbornane-2,5-diyl group, adamantane-1,5-diyl group, adamantane-2,6-diyl group, etc. can be mentioned. A x The bonding position to the sultone ring of can be at any position, but the one at the 1-position is preferred.

[0137] Examples of the structural unit (a6-0) include the following structural units. TIFF2025113197000102.tif85143

[0138] Among them, the structural units represented by formula (a6-1), formula (a6-2), formula (a6-6), formula (a6-7), formula (a6-8) and formula (a6-12) are preferred, and the structural units represented by formula (a6-1), formula (a6-2), formula (a6-7) and (a6-8) are more preferred. When resin (A) etc. contains the structural unit (a6), its content is preferably 1 to 50 mol%, more preferably 2 to 40 mol%, and still more preferably 3 to 30 mol% with respect to all the structural units of resin (A) etc.

[0139] <Structural unit (a7)> Resin (A), etc. may further contain a structural unit that decomposes upon exposure other than the structural unit (IP) to generate an acid (hereinafter sometimes referred to as "structural unit (a7)"). However, the structural unit (IP) is excluded. Specific examples of the structural unit (a7) include the structural units described in JP-A-2016-79235, and it is preferably a structural unit having a sulfonate group or a carboxylate group and an organic cation in the side chain or a structural unit having a sulfonio group and an organic anion in the side chain. The structural unit having a sulfonate group or a carboxylate group and an organic cation in the side chain is preferably a structural unit represented by the formula (a7-A). TIFF2025113197000103.tif26124[In the formula (a7-A), R a7 represents a hydrogen atom, a halogen atom, or an alkyl group having 1 to 6 carbon atoms which may have a halogen atom. X a71 represents a single bond, *-O-**, *-CO-O-**, *-O-CO-O-**, *-CO-NR a71 -**, *-NR a71 -CO-O-**, *-O-CO-NR a71 -** or *-Ax-Ph-Ay-**. R a71 represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms. Ph represents a phenylene group which may have a substituent. Ax and Ay each independently represent one or more bond types selected from the group consisting of a single bond, an ether bond, a thioether bond, an ester bond, an amide bond, and a carbonate bond. * and ** represent bonding sites, and * represents the bonding site with the carbon atom to which R a7 is bonded. L a71 and L a72 each independently represent a hydrocarbon group having 1 to 24 carbon atoms which may have a substituent, and -CH2- contained in the hydrocarbon group may be replaced by -O-, -S-, -CO-, or -SO2-. X a72represents ***-CO-O-, ***-O-CO-, ***-O-CO-O-, ***-O-, where *** is L a71 represents the bonding site with L. na7 represents any integer from 0 to 2. When na7 is 2, the groups in the plurality of parentheses may be the same as or different from each other. RA - represents a sulfonate anion or a carboxylate anion. ZA + represents an organic cation.]

[0140] R a7 As the halogen atom and the alkyl group having 1 to 6 carbon atoms which may have a halogen atom in R, R of formula (a1-0), formula (a1-1) and formula (a1-2) a01 R a4 and R a5 include those similar to those exemplified by. R a7 is preferably a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, more preferably a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, further preferably a hydrogen atom, a methyl group or an ethyl group, and even more preferably a hydrogen atom or a methyl group. R a71 The alkyl group having 1 to 6 carbon atoms in R includes a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, a sec-butyl group, a tert-butyl group, a pentyl group, and a hexyl group. X a71 When the group represented by *-Ax-Ph-Ay-** is represented by X, it is preferably a linking group represented by the following formula (X10). TIFF2025113197000104.tif3351 [In formula (X10), Ax represents the bonding species that binds to the carbon atom to which R a7 is bonded, and represents one or more bonding species selected from the group consisting of a single bond, an ether bond, a thioether bond, an ester bond, a carbonate ester bond, and an amide bond. Ay is L a71Represents a bonding type for bonding, and represents one or more bonding types selected from the group consisting of a single bond, an ether bond, a thioether bond, an ester bond, a carbonate bond, and an amide bond. Rx represents a halogen atom, a hydroxy group, a C1-C6 fluoroalkyl group, a C1-C18 alkyl group, or a C1-C6 alkoxy group. mx represents any integer from 0 to 4. When mx is an integer of 2 or more, the plurality of Rx may be the same as or different from each other. When either Ax or Ay is a single bond, the other is preferably one or more selected from the group consisting of an ether bond, a thioether bond, an ester bond, a carbonate bond, and an amide bond. When either Ax or Ay is an amide bond, the bond represented by -CO-NR a71 - is preferably the bond. The bonding position of Ay in the phenylene group is preferably the m-position or the p-position with respect to the bonding position of Ax, and more preferably the p-position. Among them, Rx is preferably a fluorine atom, an iodine atom, a trifluoromethyl group, a methyl group, or an ethyl group. mx is preferably 0, 1, or 2. X a71 Examples of X 10 -1) to the group represented by formula (X 10 -10). * represents the bonding site with the carbon atom to which -R a7 is bonded. ** represents the bonding site with L a71 . X 20 represents -O- or -NR a71 -. TIFF2025113197000105.tif44162 Formula (X 10 -1) to the group represented by formula (X 10 -10) include the following groups as specific examples. TIFF2025113197000106.tif79161 Among them, X a71 is a single bond or the formula (X 10 -1’) and the formula (X 10 -3’) to10 It is preferably a group represented by any one of -9’), and is a single bond or formula (X 10 -1’), formula (X 10 -4’), formula (X 10 -5’), formula (X 10 -6’) and formula (X 10 -9’), more preferably a single bond, a group represented by formula (X 10 -1’), a group represented by formula (X 10 -5’), a group represented by formula (X 10 -6’) or a group represented by formula (X 10 -9’).

[0141] L a71 As the hydrocarbon group of, a group obtained by removing one hydrogen atom from a chain hydrocarbon group, an alicyclic hydrocarbon group, an aromatic hydrocarbon group, or a group combining two or more of these groups, and bonding to X a71 and X a72 is mentioned. Further, as the hydrocarbon group of L a72 a group obtained by removing one hydrogen atom from a chain hydrocarbon group, an alicyclic hydrocarbon group, an aromatic hydrocarbon group, or a group combining two or more of these groups, and bonding to X a72 and RA - is mentioned. L a71 and L a72 Examples of the chain hydrocarbon group of include a group obtained by removing one hydrogen atom from an alkyl group or an alkenyl group. The alkyl group may be linear or branched, and specifically includes a methyl group, an ethyl group, an n-propyl group, an iso-propyl group, an n-butyl group, a sec-butyl group, an iso-butyl group, a tert-butyl group, a pentyl group, a hexyl group, a heptyl group, an octyl group, a nonyl group, a decyl group, an undecyl group, a dodecyl group, a tridecyl group, a tetradecyl group, a pentadecyl group, a heptadecyl group, etc. Examples of the alkenyl group include an ethenyl group, a propenyl group, an isopropenyl group, a butenyl group, an isobutenyl group, a tert-butenyl group, a pentenyl group, a hexenyl group, a heptenyl group, an octenyl group, an isooctenyl group, a nonenyl group, etc. The number of carbon atoms in the chain hydrocarbon group is preferably from 1 to 20, more preferably from 1 to 18, and even more preferably from 1 to 10. L a71 and L a72 Examples of the alicyclic hydrocarbon group of L and L include a group obtained by removing one hydrogen atom from a monocyclic or polycyclic cycloalkyl group. Examples of the monocyclic cycloalkyl group include a cyclobutyl group, a cycloheptyl group, a cyclohexyl group, a cyclopentyl group, a cyclooctyl group, and the like. L a71 and L a72 Examples of the polycyclic cycloalkyl group of L and L include a cycloalkyl group having a crosslinked structure, a cycloalkyl group in which two or more rings are condensed, or a cycloalkyl group in which two rings are spiro-bonded. Examples of the cycloalkyl group having a crosslinked structure include a norbornyl group, an adamantyl group, and the like. Examples of the cycloalkyl group in which two or more rings are condensed include a bicyclo[4,4,0]decane group, a steroid group (steroid skeleton), and the like. Examples of the cycloalkyl group in which two rings are spiro-bonded include a spirocyclic cycloalkyl group in which one cycloalkyl group selected from the group consisting of a cyclopentyl group, a cyclohexyl group, a norbornyl group, and an adamantyl group and a cycloalkyl group having 5 to 8 carbon atoms are spiro-bonded. Further, a double bond may be formed between two carbon atoms contained in the alicyclic hydrocarbon group. More specifically, the alicyclic hydrocarbon group represented by the following formula can be mentioned. TIFF2025113197000107.tif28158 When the alicyclic hydrocarbon group is a monocyclic cycloalkyl group, the number of carbon atoms in the alicyclic hydrocarbon group is preferably from 3 to 18, more preferably from 3 to 12, and even more preferably from 3 to 8. When the alicyclic hydrocarbon group is a polycyclic cycloalkyl group, the number of carbon atoms in the alicyclic hydrocarbon group is preferably from 6 to 18, more preferably from 7 to 12. L a71 and L a72Examples of the aromatic hydrocarbon group include a group obtained by removing one hydrogen atom from an aryl group. Examples of the aryl group include a phenyl group, a naphthyl group, an anthryl group, a biphenyl group, a fluorenyl group, and the like. The number of carbon atoms in the aromatic hydrocarbon group is preferably 5 to 14, more preferably 6 to 14, and even more preferably 6 to 10. L a71 and L a72 When -CH2- contained in the hydrocarbon group of L and L is replaced by -O-, -CO-, -S- or -SO2-, the number of carbon atoms before replacement is defined as the number of carbon atoms of the hydrocarbon group. L a71 and L a72 Examples of the group in which -CH2- contained in the chain hydrocarbon group among the hydrocarbon groups of L and L is replaced by -O-, -CO-, -S- or -SO2- include a hydroxy group, a carboxy group, a carbonyl group, an oxy group, an alkoxy group, an alkoxycarbonyl group, an alkylcarbonyl group, an alkylcarbonyloxy group, an alkanedioxy group, an alkanedioxycarbonyl group, an alkanediylcarbonyl group, an alkanediylcarbonyloxy group, and the like. These replaced groups include those similar to those exemplified in this specification as long as the upper limit of the number of carbon atoms allows. L a71 and L a72 Examples of the group in which -CH2- contained in the alicyclic hydrocarbon group among the hydrocarbon groups of L and L is replaced by -O-, -CO-, -S- or -SO2- include a group containing a cyclic ether, a cyclic ketone, a cyclic ester (lactone), a cyclic thioether, a cyclic acetal, a cyclic sulfonic acid ester (sultone) structure, and the like. Specifically, alicyclic hydrocarbon groups represented by the following formulas can be mentioned. The bonding position of the alicyclic hydrocarbon groups listed in the following formulas can be any position. TIFF2025113197000108.tif46146L a71 and L a72 Among the hydrocarbon groups of L and L, -CH2- contained in the aromatic hydrocarbon group may be replaced by -O- or -S-. Examples of the group in which -CH2- is replaced by -O- or -S- include groups derived from a furan ring or a thiophene ring, respectively. L a71 and L a72 Examples of the group formed by combining two or more of the chain hydrocarbon group, alicyclic hydrocarbon group, and aromatic hydrocarbon group of L L a71 and L a72 Examples of the substituent that the hydrocarbon group of L L a71 and L a72 may have include a halogen atom, a cyano group, and a nitro group. Examples of the halogen atom include a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom. a71 L a72 and L a71 and L a72 When the hydrocarbon group of L na7 is preferably 0 or 1. ZA in formula (a7-A) + is the same as the cation in the salt represented by formula (B1) etc.

[0142] In formula (a7-A), when the hydrocarbon group of L a71 and L a72 is a saturated hydrocarbon group, in formula (a7-B) described later, A b7It may contain a group similar to the group exemplified as the divalent linking group. Examples of the structural unit represented by the formula (a7-A) include the structural unit represented by the formula (a7-A1) and the like. TIFF2025113197000109.tif30138[In the formula (a7-A1), R a7 、X a71 、L a71 、X a72 、na7、RA - and ZA + represent the same meaning as described above. z7 represents any integer from 0 to 6. Q a7 、Q b7 、R z71 and R z72 each independently represent a hydrogen atom, a fluorine atom, a perfluoroalkyl group having 1 to 6 carbon atoms, or an alkyl group having 1 to 6 carbon atoms. When z7 is 2 or more, a plurality of R z71 and R z72 may be the same as or different from each other.] Q a7 、Q b7 、R z71 and R z72 Examples of the perfluoroalkyl group having 1 to 6 carbon atoms or the alkyl group having 1 to 6 carbon atoms in a7 include the same groups as those exemplified for R

[0143] Examples of the structural unit represented by the formula (a7-A) include, for example, the following structural units, a group corresponding to the methyl group of R a7 wherein the group is replaced by a hydrogen atom, a halogen atom (for example, a fluorine atom), or an alkyl group having 1 to 6 carbon atoms which may have a halogen atom (for example, a trifluoromethyl group, etc.), and the structural unit described in International Publication No. 2012 / 050015. ZA + represents an organic cation. TIFF2025113197000110.tif131158

[0144] TIFF2025113197000111.tif244163

[0145] The structural unit having a sulfonio group and an organic anion in the side chain is preferably a structural unit represented by the formula (a7-B). TIFF2025113197000112.tif28104[In the formula (a7-B), R a7 represents a hydrogen atom, a halogen atom, or an alkyl group having 1 to 6 carbon atoms which may have a halogen atom. A b7 represents a single bond or a divalent linking group. R b71 represents a divalent aromatic hydrocarbon group having 6 to 18 carbon atoms which may have a substituent. R b72 and R b73 each independently represent a hydrocarbon group having 1 to 18 carbon atoms which may have a substituent, and R b72 and R b73 may be bonded to each other to form a ring together with the sulfur atom to which they are bonded. A - represents an organic anion.] R a7 Examples of the halogen atom and the alkyl group which may have a halogen atom of R include the same halogen atoms and alkyl groups which may have a halogen atom as those in the formula (a7-A). R b71 Examples of the divalent aromatic hydrocarbon group having 6 to 18 carbon atoms represented by include a phenylene group and a naphthylene group. R b72 and R b73 Examples of the hydrocarbon group represented by include an alkyl group, an alicyclic hydrocarbon group, an aromatic hydrocarbon group, and a group formed by combining these. Examples of the alkyl group, alicyclic hydrocarbon group, aromatic hydrocarbon group, and a group formed by combining these are the same as those described above. A b7 Examples of the divalent linking group represented by include a divalent saturated hydrocarbon group having 1 to 18 carbon atoms, and -CH2- contained in the divalent saturated hydrocarbon group may be replaced by -O-, -S-, or -CO-. Examples of the divalent saturated hydrocarbon group include a divalent chain saturated hydrocarbon group such as a linear or branched alkanediyl group, and a monocyclic or polycyclic divalent alicyclic saturated hydrocarbon group, and combinations thereof may also be used. Specifically, linear alkanediyl groups such as methylene group, ethylene group, propane-1,3-diyl group, propane-1,2-diyl group, butane-1,4-diyl group, pentane-1,5-diyl group, hexane-1,6-diyl group, heptane-1,7-diyl group, octane-1,8-diyl group, nonane-1,9-diyl group, decane-1,10-diyl group, undecane-1,11-diyl group, dodecane-1,12-diyl group; branched alkanediyl groups such as butane-1,3-diyl group, 2-methylpropane-1,3-diyl group, 2-methylpropane-1,2-diyl group, pentane-1,4-diyl group, 2-methylbutane-1,4-diyl group; divalent monocyclic alicyclic saturated hydrocarbon groups which are monocyclic cycloalkanediyl groups such as cyclobutane-1,3-diyl group, cyclopentane-1,3-diyl group, cyclohexane-1,4-diyl group, cyclooctane-1,5-diyl group; divalent polycyclic alicyclic saturated hydrocarbon groups which are polycyclic cycloalkanediyl groups such as norbornane-1,4-diyl group, norbornane-2,5-diyl group, adamantane-1,5-diyl group, adamantane-2,6-diyl group, etc. may be mentioned. Examples of those in which -CH2- contained in the saturated hydrocarbon group is replaced by -O-, -S- or -CO- include divalent groups represented by the following. However, the number of carbon atoms before -CH2- contained in the saturated hydrocarbon group is replaced by -O-, -S- or -CO- is 17 or less respectively. In the following formula, * and ** represent bonding sites, and * represents the bonding site with R b71 and represents the bonding site with R. TIFF2025113197000113.tif123161[In the formula, X 3 represents a divalent saturated hydrocarbon group having 1 to 16 carbon atoms. X 4 represents a divalent saturated hydrocarbon group having 1 to 15 carbon atoms. X 5 represents a divalent saturated hydrocarbon group having 1 to 13 carbon atoms. X 6represents a divalent saturated hydrocarbon group having 1 to 14 carbon atoms. X 7 represents a trivalent saturated hydrocarbon group having 1 to 14 carbon atoms. X 8 represents a divalent saturated hydrocarbon group having 1 to 13 carbon atoms.

[0146] Examples of the structural unit containing the cation in formula (a7-B) include the structural unit represented below and the group corresponding to the methyl group of R a7 in which the hydrogen atom, halogen atom (e.g., fluorine atom), or alkyl group having 1 to 6 carbon atoms which may have a halogen atom (e.g., trifluoromethyl group, etc.) replaces the methyl group of R, and the like. TIFF2025113197000114.tif75164

[0147] A - Examples of the organic anion represented by A include sulfonate anions, sulfonylimide anions, sulfonylmethide anions, and carboxylate anions. A - The organic anion represented by A is preferably a sulfonate anion, and more preferably the same as the anion exemplified by the acid generator (B). Examples of the sulfonylimide anion, sulfonylmethide anion, and carboxylate anion include the same as the anion exemplified by the acid generator (B).

[0148] Examples of the structural unit represented by formula (a7-B) include the structural unit represented below. JPEG2025113197000115.jpg95157

[0149] When the resin (A) etc. contains the structural unit (a7), the structural unit (a7) may be contained alone or may contain two or more kinds. The total content rate of the structural unit (a7) is preferably 1 to 30 mol% with respect to all the structural units of the resin (A) etc., more preferably 1 to 25 mol%, still more preferably 2 to 20 mol%, even more preferably 3 to 15 mol%, and even more preferably 3 to 10 mol%.

[0150] The resin (A) etc. is preferably a resin containing the structural unit (a1). In particular, the resin (Ap) is more preferably a resin composed of the structural unit (IP), the structural unit (a1), and the structural unit (s), that is, a copolymer of the salt (I), the monomer (a1), and the monomer (s). The resin (A) not containing the structural unit (IP) is preferably a resin composed of the structural unit (a1) and the structural unit (s), that is, a copolymer of the monomer (a1) and the monomer (s). The structural unit (a1) is preferably at least one selected from the group consisting of the structural unit (a1-0), the structural unit (a1-1), the structural unit (a1-2) (preferably the structural unit having a cyclohexyl group or a cyclopentyl group), the structural unit represented by the formula (a1-4), the structural unit represented by the formula (a1-5), and the structural unit represented by the formula (a1-6), more preferably at least two kinds, and still more preferably at least two kinds selected from the group consisting of the structural unit (a1-1) and the structural unit (a1-2). The structural unit (s) is preferably at least one selected from the group consisting of the structural unit (a2) and the structural unit (a3). The structural unit (a2) is preferably the structural unit (a2-C) or the structural unit (a2-A). The structural unit (a3) is preferably at least one selected from the group consisting of the structural unit represented by the formula (a3-1), the structural unit represented by the formula (a3-2), and the structural unit represented by the formula (a3-4).

[0151] Each structural unit constituting the resin (A) etc. may be used alone or in combination of two or more, and can be produced by a known polymerization method (for example, radical polymerization method) using the monomers leading to these structural units. The content ratio of each structural unit possessed by the resin (A) etc. can be adjusted by the amount of monomers used in the polymerization. The resin (A) and the resin (Ap) preferably have a weight average molecular weight of 2,000 or more (more preferably 2,500 or more, still more preferably 3,000 or more) and 50,000 or less (more preferably 30,000 or less, still more preferably 15,000 or less), but may contain oligomers having a weight average molecular weight of less than 2,000. In this specification, the weight average molecular weight is a value determined by gel permeation chromatography under the conditions described in the examples. Note that the structural unit (IP) may constitute a dimer, trimer, compound or oligomer having a weight average molecular weight of less than 2,000.

[0152] <Acid generator> The acid generator of the present invention is an acid generator containing the salt (I) of the present invention and / or the structural unit (IP). The structural unit (IP) can be contained as a compound or resin in which a plurality are polymerized. In the acid generator, one kind of the salt (I) may be contained, or two or more kinds of the salt (I) may be contained. Also, one kind of the compound or resin containing the structural unit (IP) may be used alone, or two or more kinds may be used in combination. Further, the acid generator of the present invention may contain both the salt (I) and the structural unit (IP). In addition to the salt (I) and / or the structural unit (IP), the acid generator of the present invention may contain a known compound (hereinafter sometimes referred to as "compound (B)" or "acid generator (B)") that acts as an acid generator in the resist field. The compound (B) may be used alone or in combination of two or more. When the acid generator contains salt (I) and compound (B), the content ratio (mass ratio, salt (I): compound (B)) of salt (I) and compound (B) is, for example, 1:99 to 99:1, preferably 2:98 to 98:2, more preferably 5:95 to 95:5, still more preferably 10:90 to 90:10, even more preferably 15:85 to 85:15, and particularly preferably 40:60 to 60:40. When the acid generator contains structural unit (IP) and compound (B), the content ratio (mass ratio, structural unit (IP): compound (B)) of structural unit (IP) and compound (B) is, for example, 1:99 to 99:1, preferably 2:98 to 98:2, more preferably 5:95 to 95:5, still more preferably 10:90 to 90:10, even more preferably 15:85 to 85:15, and particularly preferably 40:60 to 60:40.

[0153] [Resist composition] The resist composition of the present invention contains the acid generator of the present invention. The acid generator here may be salt (I) or may be resin (Ap) containing structural unit (IP). The resist composition of the present invention may contain a resin in addition to the acid generator of the present invention. The resin may be a resin containing structural unit (a1) having an acid-labile group or may be a resin not containing structural unit (a1). However, the resist composition of the present invention contains at least one of salt (I) and structural unit (IP) and may contain both. That is, the resist composition of the present invention only needs to contain an acid generator containing structural unit (IP) of the present invention or salt (I) of the present invention. Structural unit (IP) may be in any form such as a compound or a resin. In other words, the resist composition of the present invention may contain resin (Ap) and salt (I) as an acid generator. The resist composition of the present invention preferably contains a resin containing structural unit (a1) having an acid-labile group. That is, at least, (a) contains salt (I) and resin (A) containing structural unit (a1) having an acid-labile group, or (b) contains resin (Ap) containing structural unit (IP) and structural unit (a1) having an acid-labile group, It is preferable to include a resin (Ap) containing a structural unit (IP) and a resin (A) containing a structural unit (a1) having an acid-labile group. Among them, it is preferably the resist composition of the above (b). The resist composition of the present invention may contain two or more kinds of resins (A) and / or resin (Ap). Further, the above (b) and (c) may further contain a salt (I). The resist composition of the present invention preferably further contains a quencher (hereinafter sometimes referred to as "quencher (C)") and / or a solvent (hereinafter sometimes referred to as "solvent (E)"). Further, the resist composition of the present invention may further contain a resin other than the above-described resin (A) and the like.

[0154] <Resin other than resin (A) etc.> The resist composition of the present invention may contain a resin other than resin (Ap) and resin (A). Examples of the resin other than resin (Ap) and resin (A) include a resin containing the same structural unit as resin (A) described above except that it does not contain structural unit (a1) (hereinafter sometimes referred to as "resin (AX)"), and a resin containing structural unit (a4) and / or structural unit (a5) (however, it does not contain structural unit (IP) and structural unit (a1); hereinafter sometimes referred to as "resin (X)").

[0155] Examples of resin (AX) include a resin containing structural unit (a2), and a resin containing structural unit (a2-A) is preferable. In resin (AX), the content of structural unit (a2-A) is preferably 5 mol% or more, more preferably 10 mol% or more, and still more preferably 15 mol% or more with respect to the total of all structural units of resin (AX). Further, it is preferably 80 mol% or less, and more preferably 70 mol% or less. Examples of the structural units that resin (X) may further have include structural unit (a2), structural unit (a3), and structural units derived from other known monomers. Among them, resin (X) is preferably a resin composed only of structural unit (a4) and / or structural unit (a5), and more preferably a resin composed only of structural unit (a4). When resin (X) contains structural unit (a4), in resin (X), the content of structural unit (a4) is 20 mol% or more, preferably 30 mol% or more, more preferably 40 mol% or more, and still more preferably 45 mol% or more, based on the total of all the structural units of resin (X). Also, it is 100 mol% or less, preferably 80 mol% or less, more preferably 70 mol% or less, still more preferably 60 mol% or less, and even more preferably 55 mol% or less. Specifically, it is 20 to 100 mol%, preferably 20 to 80 mol%, more preferably 30 to 70 mol%, still more preferably 40 to 60 mol%, and even more preferably 45 to 55 mol%. When resin (X) contains structural unit (a5), the content of structural unit (a5) is 20 mol% or more, preferably 30 mol% or more, more preferably 40 mol% or more, and still more preferably 45 mol% or more, based on the total of all the structural units of resin (X). Also, it is 100 mol% or less, preferably 80 mol% or less, more preferably 70 mol% or less, still more preferably 60 mol% or less, and even more preferably 55 mol% or less. Specifically, it is 20 to 100 mol%, preferably 20 to 80 mol%, more preferably 30 to 70 mol%, still more preferably 40 to 60 mol%, and even more preferably 45 to 55 mol%. Further, when resin (X) contains structural unit (a4) and structural unit (a5), the total content of structural unit (a4) and structural unit (a5) is 40 mol% or more, preferably 60 mol% or more, more preferably 70 mol% or more, and still more preferably 80 mol% or more, based on the total of all the structural units of resin (X). Further, it is 100 mol% or less. Specifically, it is 40 to 100 mol%, preferably 60 to 100 mol%, more preferably 70 to 100 mol%, and still more preferably 80 to 100 mol%. Among them, the resin (X) is preferably a resin composed only of the structural unit (a4) and / or the structural unit (a5). In this case, the ratio of the structural unit (a4) to the structural unit (a5) is 0:100 to 100:0, preferably 10:90 to 90:10, more preferably 30:70 to 70:30 or 40:60 to 60:40. Each structural unit constituting the resin (AX) and the resin (X) may be used alone or in combination of two or more, and can be produced by a known polymerization method (for example, radical polymerization method) using the monomers that induce these structural units. The content of each structural unit of the resin (AX) and the resin (X) can be adjusted by the amount of the monomers used in the polymerization. The resin (AX) and the resin (X) preferably have a weight average molecular weight of 6,000 or more (more preferably 7,000 or more) and 80,000 or less (more preferably 60,000 or less), but may contain oligomers having a weight average molecular weight of less than 6,000. The measuring means for the weight average molecular weight of the resin (AX) and the resin (X) is the same as that of the resin (A) and the like.

[0156] When the resist composition of the present invention contains the resin (X), its content is preferably 1 to 60 parts by mass, more preferably 1 to 50 parts by mass, still more preferably 1 to 40 parts by mass, even more preferably 1 to 30 parts by mass, and even more preferably 1 to 8 parts by mass, based on 100 parts by mass in total of the resin (A) and the like.

[0157] The total content of the resin (A) etc. in the resist composition is preferably 60% by mass or more and 99% by mass or less, more preferably 70% by mass or more and 99% by mass or less, still more preferably 80% by mass or more and 99% by mass or less, and even more preferably 90% by mass or more and 99% by mass or less, based on the solid content of the resist composition. The content of the resin (Ap) is preferably 60% by mass or more and 99% by mass or less, more preferably 70% by mass or more and 99% by mass or less, still more preferably 80% by mass or more and 99% by mass or less, and even more preferably 90% by mass or more and 99% by mass or less, based on the solid content of the resist composition. Further, when a resin other than the resin (A) etc. is included, the total content of the resin (A) etc. and the resin other than the resin (A) etc. is preferably 60% by mass or more and 99% by mass or less, more preferably 70% by mass or more and 99% by mass or less, still more preferably 80% by mass or more and 99% by mass or less, and even more preferably 90% by mass or more and 99% by mass or less, based on the solid content of the resist composition. The solid content of the resist composition and the content of the resin relative thereto can be measured by known analytical means such as liquid chromatography or gas chromatography.

[0158] <Acid generator> As described above, the acid generator of the present invention may be any of an acid generator containing only the salt (I) and / or the structural unit (IP), and an acid generator containing the salt (I) and / or the structural unit (IP) and a known compound (B) that acts as an acid generator in the resist field. <Compound (B)> As the compound (B), either a nonionic compound or an ionic compound may be used. Examples of the nonionic compound include sulfonate esters (e.g., 2-nitrobenzyl ester, aromatic sulfonate, oxime sulfonate, N-sulfonyloxyimide, sulfonyloxy ketone, diazonaphthoquinone 4-sulfonate), sulfones (e.g., disulfone, ketosulfone, sulfonyldiazomethane), etc. Representative examples of the ionic compound include onium salts containing an onium cation (e.g., diazonium salts, phosphonium salts, sulfonium salts, iodonium salts). Examples of the anion of the onium salt include sulfonic acid anion, benzenesulfonyl anion, sulfonylimide anion, sulfonylmethide anion, and carboxylic acid anion, etc. Further, the compound (B) may be a structural unit having an acid generating function, and for example, it may be a part of a resin containing the above structural unit (a7) or the like.

[0159] As the compound (B), compounds that generate an acid upon irradiation as described in JP-A-63-26653, JP-A-55-164824, JP-A-62-69263, JP-A-63-146038, JP-A-63-163452, JP-A-62-153853, JP-A-63-146029, U.S. Patent No. 3,779,778, U.S. Patent No. 3,849,137, German Patent No. 3914407, European Patent No. 126,712, etc. can be used. Also, a compound produced by a known method may be used. Further, the compound (B) may be an acid generator having an acid-labile group. For example, the compound or resin serving as the acid generator may contain a partial structure that becomes an acid-labile group, and the acid-labile group preferably contains the above group (1) or group (2). When the resist composition of the present invention contains a compound having an acid-labile group, a resin containing a structural unit having an acid-labile group may not be included.

[0160] Compound (B) is preferably a salt represented by formula (B1) (hereinafter sometimes referred to as "salt (B1)" or "compound (B1)", provided that salt (I) is excluded) or a salt represented by formula (B2) (hereinafter sometimes referred to as "salt (B2)" or "compound (B2)"). TIFF2025113197000116.tif1392[In formula (B1), L b1 represents a single bond or an (nb1 + 1)-valent hydrocarbon group which may have a substituent, and -CH2- contained in the hydrocarbon group may be replaced by -O-, -S-, -CO- or -SO2-. L b2 represents a single bond or a divalent hydrocarbon group having 1 to 24 carbon atoms which may have a substituent, and -CH2- contained in the hydrocarbon group may be replaced by -O-, -S-, -CO- or -SO2-. Y b1 represents a methyl group which may have a substituent or a cyclic hydrocarbon group having 3 to 24 carbon atoms which may have a substituent, and -CH2- contained in the cyclic hydrocarbon group may be replaced by -O-, -S-, -SO2- or -CO-. nb1 represents any integer from 1 to 6. When nb1 is 2 or more, the groups in the plurality of parentheses may be the same as or different from each other. Z1 + represents an organic cation.]

[0161] In formula (B1), as the (nb1 + 1)-valent hydrocarbon group of L b1 there may be mentioned a monovalent chain hydrocarbon group, a monovalent alicyclic hydrocarbon group, a monovalent aromatic hydrocarbon group and a monovalent group formed by combining two or more of these groups, from which nb1 hydrogen atoms are removed and which is bonded to one or more L b2 groups. The number of carbon atoms of the hydrocarbon group is preferably from 1 to 48, more preferably from 1 to 42, still more preferably from 1 to 36, even more preferably from 1 to 30, and still even more preferably from 1 to 24. Examples of the chain hydrocarbon group include a group obtained by removing nb1 hydrogen atoms from an alkyl group or an alkenyl group. The alkyl group may be linear or branched, and specific examples include methyl group, ethyl group, n-propyl group, iso-propyl group, n-butyl group, sec-butyl group, iso-butyl group, tert-butyl group, pentyl group, hexyl group, heptyl group, octyl group, nonyl group, decyl group, undecyl group, dodecyl group, tridecyl group, tetradecyl group, pentadecyl group, heptadecyl group, and the like. Examples of the alkenyl group include ethenyl group, propenyl group, isopropenyl group, butenyl group, isobutenyl group, tert-butenyl group, pentenyl group, hexenyl group, heptenyl group, octenyl group, isooctenyl group, and nonenyl group. The number of carbon atoms in the chain hydrocarbon group is preferably from 1 to 36, more preferably from 1 to 24, still more preferably from 1 to 20, even more preferably from 1 to 18, even further preferably from 1 to 12, and even further preferably from 1 to 10. Examples of the alicyclic hydrocarbon group include a group obtained by removing nb1 hydrogen atoms from a monocyclic or polycyclic cycloalkyl group. Examples of the monocyclic cycloalkyl group include cyclobutyl group, cyclopentyl group, cyclohexyl group, cycloheptyl group, cyclooctyl group, and the like. Examples of the polycyclic cycloalkyl group include a cycloalkyl group having a crosslinked structure, a cycloalkyl group in which two or more rings are condensed, or a cycloalkyl group in which two rings are spiro-bonded. Examples of the cycloalkyl group having a crosslinked structure include norbornyl group, adamantyl group, and the like. Examples of the cycloalkyl group in which two or more rings are condensed include bicyclo[4,4,0]decane group, steroid group (steroid skeleton), and the like. Examples of the cycloalkyl group in which two rings are spiro-bonded include a spirocyclic cycloalkyl group in which one cycloalkyl group selected from the group consisting of cyclopentyl group, cyclohexyl group, norbornyl group, and adamantyl group and a cycloalkyl group having 5 to 8 carbon atoms are spiro-bonded. Further, a double bond may be formed between two carbon atoms contained in the alicyclic hydrocarbon group. More specifically, examples of the alicyclic hydrocarbon group include those represented by the following formula. TIFF2025113197000117.tif26168 When the alicyclic hydrocarbon group is a monocyclic cycloalkyl group, the number of carbon atoms in the alicyclic hydrocarbon group is preferably 3 to 24, more preferably 3 to 20, still more preferably 3 to 18, even more preferably 3 to 12, even still more preferably 3 to 10, and even more preferably 3 to 8. When the alicyclic hydrocarbon group is a polycyclic cycloalkyl group, the number of carbon atoms in the alicyclic hydrocarbon group is preferably 6 to 24, more preferably 6 to 20, still more preferably 6 to 18, even more preferably 6 to 12, and even still more preferably 7 to 12. Examples of the aromatic hydrocarbon group include a group obtained by removing nb1 hydrogen atoms from an aryl group. Examples of the aryl group include a phenyl group, a naphthyl group, an anthryl group, a biphenyl group, a fluorenyl group, and the like. More specifically, examples of the aromatic hydrocarbon group include those represented by the following formula. TIFF2025113197000118.tif1396 The number of carbon atoms in the aromatic hydrocarbon group is preferably 4 to 24, more preferably 4 to 20, still more preferably 4 to 18, even more preferably 5 to 14, even still more preferably 5 to 10, and even more preferably 6 to 10. L b1 When -CH2- contained in the hydrocarbon group of L is replaced by -O-, -CO-, -S- or -SO2-, the number of carbon atoms before replacement is taken as the number of carbon atoms of the hydrocarbon group. L b1Among the hydrocarbon groups, examples of the group in which -CH2- contained in the chain hydrocarbon group is replaced by -O-, -CO-, -S- or -SO2- include a hydroxy group, a carboxy group, a carbonyl group, an oxy group, an alkoxy group, an alkoxycarbonyl group, an alkylcarbonyl group, an alkylcarbonyloxy group, an alkanedioxy group, an alkanedioxycarbonyl group, an alkanediylcarbonyl group, an alkanediylcarbonyloxy group, and the like. These replaced groups include, within the range allowed by the upper limit of the number of carbon atoms, the same groups as those exemplified in the present specification. L b1 Among the hydrocarbon groups, examples of the group in which -CH2- contained in the alicyclic hydrocarbon group is replaced by -O-, -CO-, -S- or -SO2- include groups containing structures such as a cyclic ether, a cyclic ketone, a cyclic ester (lactone), a cyclic thioether, a cyclic acetal, a cyclic sulfonic acid ester ( sultone), and the like. Specifically, within the range allowed by the upper limit of the number of carbon atoms, the same groups as those exemplified in the present specification are included. In addition, alicyclic hydrocarbon groups represented by the following formulas are also included. The bonding position of the alicyclic hydrocarbon group shown in the following formulas can be any position. TIFF2025113197000119.tif48165L b1 Among the hydrocarbon groups, -CH2- contained in the aromatic hydrocarbon group may be replaced by -O- or -S-. Examples of the group in which -CH2- is replaced by -O- or -S- include groups derived from a furan ring or a thiophene ring, respectively. Specifically, aromatic hydrocarbon groups represented by the following formulas are included. TIFF2025113197000120.tif1326Examples of the group in which -CH2- contained in a group combining an alicyclic hydrocarbon group and an aromatic hydrocarbon group is replaced by -O-, -S-, -CO- or -SO2- include, within the range allowed by the upper limit of the number of carbon atoms, the same groups as those exemplified in the present specification. Examples of a group formed by combining two or more of an alicyclic hydrocarbon group, an alicyclic hydrocarbon group, and an aromatic hydrocarbon group include a group formed by combining the above alicyclic hydrocarbon group and the above alicyclic hydrocarbon group, a group formed by combining the above alicyclic hydrocarbon group and the above aromatic hydrocarbon group, a group formed by combining the above alicyclic hydrocarbon group and the above aromatic hydrocarbon group, and a group formed by combining the above alicyclic hydrocarbon group, the above alicyclic hydrocarbon group, and the above aromatic hydrocarbon group. The group formed by combining the alicyclic hydrocarbon group and the aromatic hydrocarbon group may be a condensed ring. L b2 Examples of the divalent hydrocarbon group of include a divalent alicyclic hydrocarbon group, a divalent alicyclic hydrocarbon group, a divalent aromatic hydrocarbon group, and a group formed by combining two or more of these groups, and one hydrogen atom is removed from the monovalent hydrocarbon group to form Y b1 And the group bonded to. L b2 Examples of the divalent alicyclic hydrocarbon group, divalent alicyclic hydrocarbon group, divalent aromatic hydrocarbon group, and divalent group formed by combining two or more of these groups of are, within the range allowed by the upper limit of the number of carbon atoms, respectively, L b1 Examples of the monovalent alicyclic hydrocarbon group, monovalent alicyclic hydrocarbon group, monovalent aromatic hydrocarbon group, and monovalent group formed by combining two or more of these groups exemplified in include a group obtained by removing one hydrogen atom. L b1 And L b2 Examples of the substituent that the hydrocarbon group of and L may have include a halogen atom, a cyano group, a nitro group, and the like. Examples of the halogen atom include a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, and the like. L b1 And L b2 When and L are a group formed by combining an alicyclic hydrocarbon group or an aromatic hydrocarbon group and an alicyclic hydrocarbon group, the alicyclic hydrocarbon group may be substantially regarded as a substituent of the alicyclic hydrocarbon group or the aromatic hydrocarbon group. Further, when -CH2- of the alicyclic hydrocarbon group contained in the hydrocarbon group of L and L is replaced by -O-, -CO-, -S-, or -SO2-, L b1 And L b2 And L b1 And L b2The hydrocarbon group may substantially have substituents such as a hydroxy group, a carboxy group, a carbonyl group, an oxycarbonyl group, a carbonyloxy group, an alkoxy group, an alkylcarbonyl group, an alkoxycarbonyl group, an alkylcarbonyloxy group, a thiol group, an alkylthio group, an alkylsulfonyl group, etc. L b1 and L b2 The number of substituents that may be possessed is not particularly limited, and a plurality of substituents may be possessed. Y b1 Examples of the cyclic hydrocarbon group of Y include an alicyclic hydrocarbon group, an aromatic hydrocarbon group, and a group combining an alicyclic hydrocarbon group and an aromatic hydrocarbon group. Y b1 The alicyclic hydrocarbon group and the aromatic hydrocarbon group of Y are each the same as the alicyclic hydrocarbon group and the aromatic hydrocarbon group exemplified by L, and when having no substituent, they may be a monovalent alicyclic hydrocarbon group and an aromatic hydrocarbon group. b1 Examples of the substituents that the methyl group of Y may have include a halogen atom, a cyano group, a hydroxy group, a nitro group, etc. Y b1 Examples of the substituents that the cyclic hydrocarbon group of Y may have include a halogen atom, a cyano group, a nitro group, or a hydrocarbon group having 1 to 18 carbon atoms that may have a halogen atom, a cyano group, or a nitro group (the -CH2- contained in the hydrocarbon group may be replaced by -O-, -S-, -CO- or -SO2-). Y b1 Examples of the substituents that the cyclic hydrocarbon group of Y may have include a halogen atom, a cyano group, a nitro group, or a hydrocarbon group having 1 to 18 carbon atoms that may have a halogen atom, a cyano group, or a nitro group (the -CH2- contained in the hydrocarbon group may be replaced by -O-, -S-, -CO- or -SO2-). Y b1 The number of carbon atoms of the hydrocarbon group that the cyclic hydrocarbon group of Y may have is not included in the number of carbon atoms of the cyclic hydrocarbon group of Y. b1 Examples of the halogen atom include the same halogen atoms as those exemplified as the substituents of L and L. Examples of the halogen atom include the same halogen atoms as those exemplified as the substituents of L and L. b1 and L b2 Examples of the halogen atom include the same halogen atoms as those exemplified as the substituents of L and L. Y b1The hydrocarbon group having 1 to 18 carbon atoms which may have a cyclic hydrocarbon group as a substituent includes a chain hydrocarbon group, an alicyclic hydrocarbon group, an aromatic hydrocarbon group, and a group combining these groups. Examples of the chain hydrocarbon group, the alicyclic hydrocarbon group, the aromatic hydrocarbon group, and a group combining two or more of these groups include, within the range allowed by the upper limit of the number of carbon atoms, L b1 the same groups as the chain hydrocarbon group, the alicyclic hydrocarbon group, the aromatic hydrocarbon group, and a group combining two or more of these groups exemplified by b1 . Also, Y b1 Examples of the group in which -CH2- contained in the hydrocarbon group having 1 to 18 carbon atoms which may have a cyclic hydrocarbon group of Y as a substituent is replaced by -O-, -S-, -CO- or -SO2- include, within the range allowed by the upper limit of the number of carbon atoms, L b1 the same groups as the groups exemplified by the group in which -CH2- contained in the hydrocarbon group of b1 is replaced by -O-, -S-, -CO- or -SO2-. Also, Y b1 The hydrocarbon group having 1 to 18 carbon atoms which may have a cyclic hydrocarbon group of Y as a substituent may constitute a protecting group or a leaving group (an acid-labile group or a base-labile group) generally used in the art.

[0162] Examples of the anion of the salt represented by formula (B1) include, for example, the anion represented by the following formula (B1-A1) (hereinafter sometimes referred to as "anion (B1-A1)") or the anion represented by formula (B1-A2) (hereinafter sometimes referred to as "anion (B1-A2)"). TIFF2025113197000121.tif31117[In formula (B1-A1), L b2 and Y b1 represent the same meaning as in formula (B1). Q b1 、Q b2 、Q b3 and Q b4 each independently represent a hydrogen atom, a fluorine atom, a perfluoroalkyl group having 1 to 6 carbon atoms or an alkyl group having 1 to 6 carbon atoms. z1 represents any integer from 0 to 6. When z1 is 2 or more, the groups in the plurality of parentheses may be the same as or different from each other. X 1 represents -O-CO-, -CO-O-, -O-CO-O- or -O-. L b3 represents a single bond or an (nb2 + 1)-valent hydrocarbon group having 1 to 24 carbon atoms which may have a substituent, and -CH2- contained in the hydrocarbon group may be replaced by -O-, -S-, -CO- or -SO2-. nb2 represents any integer from 1 to 3. When nb2 is 2 or more, the groups in the plurality of parentheses may be the same as or different from each other.]

[0163] Q b1 Q b2 Q b3 and Q b4 Examples of the perfluoroalkyl group of Q Q b1 Q b2 Q b3 and Q b4 include a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, a sec-butyl group, a tert-butyl group, a pentyl group, a hexyl group and the like. Q b1 and Q b2 are preferably, Q b1 and Q b2 contain at least one of a fluorine atom or a perfluoroalkyl group, more preferably a fluorine atom or a perfluoroalkyl group, even more preferably a fluorine atom or a trifluoromethyl group, and even more preferably both are fluorine atoms. Q b3 and Q b4 are each independently preferably a hydrogen atom, a fluorine atom or a perfluoroalkyl group having 1 to 3 carbon atoms, and Q b3 is preferably a hydrogen atom, a fluorine atom or a perfluoroalkyl group having 1 to 3 carbon atoms, and Qb4 is preferably a hydrogen atom or a fluorine atom. z1 is preferably any integer from 0 to 3, more preferably 0, 1 or 2. X 1 is preferably -O-CO- or -CO-O-.

[0164] L b3 As the hydrocarbon group in, within the range allowed by the upper limit of the number of carbon atoms, the same hydrocarbon groups as exemplified for L in the formula (B1) b1 can be mentioned. L b3 is preferably a single bond, an optionally substituted chain hydrocarbon group having 1 to 12 carbon atoms (the -CH2- contained in the chain hydrocarbon group may be replaced by -O- or -CO-), an optionally substituted alicyclic hydrocarbon group having 3 to 18 carbon atoms (the -CH2- contained in the alicyclic hydrocarbon group may be replaced by -O-, -S-, -CO- or -SO2-), an optionally substituted aromatic hydrocarbon group having 6 to 10 carbon atoms (the -CH2- contained in the aromatic hydrocarbon group may be replaced by -O- or -S-), or a group formed by combining two or more of these groups, more preferably a single bond, a chain hydrocarbon group having 1 to 6 carbon atoms or a group represented by the following formula (Lb3-1). When -CH2- contained in the chain hydrocarbon group is replaced by -O- or -CO-, the number thereof is preferably 1 to 4, and preferably one -CH2-CH2- contained in the chain hydrocarbon group is replaced by -O-CO- or -CO-O-, or one -CH2-CH2-CH2- contained in the chain hydrocarbon group is replaced by -O-CO-O-. TIFF2025113197000122.tif1682 [In the formula (Lb3-1), nb2 represents the same meaning as in the formula (B1-A1). L b31 represents a single bond or a chain hydrocarbon group having 1 to 12 carbon atoms, the -CH2- contained in the chain hydrocarbon group may be replaced by -O- or -CO-, and the chain hydrocarbon group may have a substituent. W b3represents an alicyclic hydrocarbon group having 3 to 18 carbon atoms or an aromatic hydrocarbon group having 6 to 10 carbon atoms, and -CH2- contained in the alicyclic hydrocarbon group may be replaced by -O-, -S-, -CO- or -SO2-, and -CH2- contained in the aromatic hydrocarbon group may be replaced by -O- or -S-, and the alicyclic hydrocarbon group and the aromatic hydrocarbon group may have substituents. * and ** represent bonding sites, and * represents the bonding site with X 1 and represents the bonding site with. In formula (Lb3-1), L b31 the chain hydrocarbon group of may be the same group as the chain hydrocarbon group exemplified by L b1 as long as the upper limit of the number of carbon atoms permits. In formula (Lb3-1), W b3 the alicyclic hydrocarbon group and the aromatic hydrocarbon group of may be the same groups as the alicyclic hydrocarbon group and the aromatic hydrocarbon group exemplified by L b1 as long as the upper limit of the number of carbon atoms permits. In formula (Lb3-1), L b31 the substituents that the chain hydrocarbon group of may have and W b3 the substituents that the alicyclic hydrocarbon group and the aromatic hydrocarbon group of may have are the same groups as the substituents exemplified as the substituents that the hydrocarbon group of L b1 may have. L b31 is preferably a single bond or an alkanediyl group having 1 to 6 carbon atoms (wherein -CH2- contained in the alkanediyl group may be replaced by -O- or -CO-). Among them, as the alicyclic hydrocarbon group and the aromatic hydrocarbon group of W b3 the alicyclic hydrocarbon group and the aromatic hydrocarbon group represented below are preferable. In the alicyclic hydrocarbon group and the aromatic hydrocarbon group represented below, * and ** represent bonding sites, and * represents the bonding site with X 1 or L b31 and represents the bonding site with, and ** represents a hydrogen atom, a substituent or the bonding site with L b2 and at least one ** is L b2represents a binding site thereto. In addition, in the alicyclic hydrocarbon group represented below, -CH2- contained in the alicyclic hydrocarbon group may be replaced by -O-, -S-, -CO- or -SO2-. When -CH2- contained in the alicyclic hydrocarbon group is replaced by -O-, -S-, -CO- or -SO2-, it is preferable that an ether ring, an ester ring (lactone), a carbonate ester ring, a sulfonic acid ester ring (sultone) or an acetal ring is formed. In formula (B1-A1), L in TIFF2025113197000123.tif37165 b2 is preferably a single bond or a chain hydrocarbon group having 1 to 12 carbon atoms (wherein -CH2- contained in the chain hydrocarbon group may be replaced by -O- or -CO-), and is preferably a single bond, -O-, -O-CO-, -CO-O-, -O-CO-O- or *-L b21 -X 2 -L b22 -**(L b21 and L b22 One of them represents a chain hydrocarbon group having 1 to 6 carbon atoms, and the other represents a single bond or a chain hydrocarbon group having 1 to 6 carbon atoms. X 2 represents -O-, -CO-O-, -O-CO- or -O-CO-O-. * and ** represent binding sites, and ** represents a binding site with Y b1 represents a binding site with Y. However, L b21 , X 2 and L b22 The total number of carbon atoms of is more preferably 12 or less. In formula (B1-A1), Y b1is preferably a cyclic hydrocarbon group having 3 to 20 carbon atoms which may have a substituent (wherein -CH2- contained in the cyclic hydrocarbon group may be replaced by -O-, -CO-, -S- or -SO2-), more preferably an alicyclic hydrocarbon group having 3 to 18 carbon atoms which may have a substituent (wherein -CH2- contained in the alicyclic hydrocarbon group may be replaced by -O-, -CO-, -S- or -SO2-) or an aromatic hydrocarbon group having 6 to 18 carbon atoms which may have a substituent, and still more preferably an alicyclic hydrocarbon group having 3 to 16 carbon atoms which may have a substituent (wherein -CH2- contained in the alicyclic hydrocarbon group may be replaced by -O-, -CO-, -S- or -SO2-) or an aromatic hydrocarbon group having 6 to 10 carbon atoms which may have a substituent. Specifically, it is preferably a group represented by the following formula (Y1) to formula (Y36). In formula (Y1) to formula (Y36), R Yb represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms among the substituents which the cyclic hydrocarbon group of Y b1 may have, and R Yc represents a hydrogen atom or a substituent which the cyclic hydrocarbon group of Y b1 may have, and * represents a bonding site with L b2 . The alicyclic hydrocarbon group and aromatic hydrocarbon group represented by the following formula may have, in addition to those not particularly illustrated in the following formula, a substituent which the cyclic hydrocarbon group of Y b1 may have. As the anion represented by formula (B1-A1), anions represented by formula (B1-A1-1) to formula (B1-A1-85) [hereinafter sometimes referred to as "anion (B1-A1-1)" etc. according to the formula number] are preferable, and an anion represented by any of formula (B1-A1-1) to formula (B1-A1-4), formula (B1-A1-9), formula (B1-A1-10), formula (B1-A1-24) to formula (B1-A1-33), formula (B1-A1-36) to formula (B1-A1-40), formula (B1-A1-47) to formula (B1-A1-85) is more preferable. TIFF2025113197000125.tif216160

[0165] TIFF2025113197000126.tif249151

[0166] TIFF2025113197000127.tif254164

[0167] Here, R i2 ~R i7 are, independently of each other, for example, an alkyl group having 1 to 4 carbon atoms, preferably a methyl group or an ethyl group. R i8 is, for example, an aliphatic hydrocarbon group having 1 to 12 carbon atoms, preferably an alkyl group having 1 to 4 carbon atoms, an alicyclic hydrocarbon group having 5 to 12 carbon atoms, or a group formed by combining these, more preferably a methyl group, an ethyl group, a cyclohexyl group, or an adamantyl group. L A41 is a single bond or an alkanediyl group having 1 to 4 carbon atoms. Q b1 and Q b2 represent the same meaning as described above. Specific examples of the anion represented by formula (B1-A1) include the anions described in JP-A-2010-204646.

[0168] Preferred anions represented by formula (B1-A1) include the anions represented by formula (B1a-1) to formula (B1a-70), respectively. Among them, anions represented by any of formula (B1a-1) to formula (B1a-4), formula (B1a-7) to formula (B1a-11), formula (B1a-14) to formula (B1a-30), and formula (B1a-35) to formula (B1a-70) are preferred. TIFF2025113197000128.tif185163

[0169] TIFF2025113197000129.tif252165

[0170] TIFF2025113197000130.tif69165

[0171] The anion represented by formula (B1-A2) is represented by the following formula. TIFF2025113197000131.tif23100[in formula (B1-A2), L b2 and Y b1 have the same meaning as in formula (B1). R b1 represents a halogen atom or an alkyl group having 1 to 6 carbon atoms, and -CH2- contained in the alkyl group may be replaced by -O- or -CO-. nb4 represents any integer from 1 to 5. When nb4 is 2 or more, the groups in multiple parentheses may be the same as or different from each other. nb3 represents any integer from 0 to 4. When nb3 is 2 or more, multiple b1 Rs may be the same as or different from each other. However, 1 ≦ nb4 + nb3 ≦ 5 is satisfied.]

[0172] In formula (B1-A2), the hydrocarbon group of L b2 and the cyclic hydrocarbon group of Y b1 are exemplified by the same as those of the hydrocarbon group of L b2 and the cyclic hydrocarbon group of Y b1 in formula (B1) within the range allowed by the upper limit of the number of carbon atoms. For the hydrocarbon group of L b2 , the methyl group of Y b1 and the substituents that the cyclic hydrocarbon group may have, the same as those exemplified for the hydrocarbon group of L b2 in formula (B1), the methyl group of Y b1 and the substituents that the cyclic hydrocarbon group may have are exemplified. These hydrocarbon groups, methyl group and cyclic hydrocarbon group may have one substituent or a plurality of substituents. In formula (B1-A2), L b2 is preferably a chain hydrocarbon group having 1 to 12 carbon atoms (where -CH2- contained in the chain hydrocarbon group may be replaced by -O- or -CO-), more preferably *-CO-O-L b41 -(L b41 is a single bond or a chain hydrocarbon group having 1 to 6 carbon atoms, and -CH2- contained in the chain hydrocarbon group may be replaced by -O- or -CO-. * is SO3- represents the bonding site with the benzene ring to which it is bonded. L b41 is preferably a single bond or a chain hydrocarbon group having 1 to 3 carbon atoms. ), and more preferably, *-CO-O-. Y b1 is preferably a cyclic hydrocarbon group having 3 to 20 carbon atoms which may have a substituent (wherein -CH2- contained in the cyclic hydrocarbon group may be replaced by -O-, -CO-, -S- or -SO2-), more preferably an alicyclic hydrocarbon group having 3 to 18 carbon atoms which may have a substituent (wherein -CH2- contained in the alicyclic hydrocarbon group may be replaced by -O-, -CO-, -S- or -SO2-) or an aromatic hydrocarbon group having 6 to 18 carbon atoms which may have a substituent, and Y of formula (B1-A1) b1 or L b1 is more preferably an alicyclic hydrocarbon group or an aromatic hydrocarbon group exemplified by. Specifically, it is preferably a group represented by the above-mentioned formulas (Y1) to (Y36), and more preferably a group represented by the above-mentioned formulas (Y1) to (Y19). In formula (B1-A2), nb4 is preferably any integer from 1 to 4, more preferably any integer from 1 to 3, still more preferably 1 or 2, and even more preferably 2. When nb4 is 1 or 2, -L b2 -Y b1 is preferably in the following structure which is the m-position substitution of the benzene ring with respect to the bonding position of SO3 - . TIFF2025113197000132.tif2399[In the above formula, L b2 , Y b1 , R b1 , and nb3 represent the same meanings as in formula (B1-A2).] When nb4 is 2 or more, a plurality of L b2 and Y b1 are preferably the same group as each other.

[0173] R b1Examples of the alkyl group having 1 to 6 carbon atoms include alkyl groups such as methyl group, ethyl group, propyl group, isopropyl group, butyl group, isobutyl group, tert-butyl group, pentyl group, and hexyl group. The number of carbon atoms of the alkyl group is preferably 1 to 4, and more preferably 1 to 3. R b1 Examples of the halogen atom of b1 include fluorine atom, chlorine atom, bromine atom, and iodine atom. Examples of the group in which -CH2- contained in the alkyl group is replaced by -O- or -CO- include hydroxy group, carboxy group, alkoxy group, alkoxycarbonyl group, alkylcarbonyl group, alkylcarbonyloxy group, oxy group, and carbonyl group. Specific examples thereof are the same as those described above. R b1 Each R is preferably independently a halogen atom or an alkyl group having 1 to 4 carbon atoms (wherein -CH2- contained in the alkyl group may be replaced by -O- or -CO-), more preferably a fluorine atom, an iodine atom, or an alkyl group having 1 to 3 carbon atoms (wherein -CH2- contained in the alkyl group may be replaced by -O- or -CO-), and even more preferably a fluorine atom, an iodine atom, a hydroxy group, a methoxy group, or a methyl group. nb3 is preferably any integer from 0 to 3, and more preferably any integer from 0 to 2. In one embodiment, nb3 is preferably 0. In another embodiment, nb3 is preferably 1 or 2. When nb3 is 1, R b1 is preferably a halogen atom, and R b1 is more preferably a fluorine atom or an iodine atom. When nb3 is 2, one of the two Rs b1 is preferably a halogen atom, and the other is preferably a halogen atom or an alkyl group having 1 to 4 carbon atoms. One of the Rs b1 is more preferably a fluorine atom or an iodine atom, and the other is more preferably a fluorine atom, an iodine atom, or an alkyl group having 1 to 3 carbon atoms.

[0174] Examples of the anion represented by the formula (B1-A2) include, for example, the following anions. Among them, the anions represented by the formulas (B2a-1) to (B2a-20) are preferred, and the anions represented by the formulas (B2a-1) to (B2a-11) and (B2a-16) to (B2a-20) are more preferred. The following anions have some of the R b1 omitted and may contain substituents not shown in the figure. TIFF2025113197000133.tif95162

[0175] TIFF2025113197000134.tif13100[In the formula (B2), A 1 represents a nitrogen atom or a carbon atom. L b2 ’ represents a divalent hydrocarbon group having 1 to 24 carbon atoms which may have a substituent, and -CH2- contained in the hydrocarbon group may be replaced by -O-, -S-, -CO- or -SO2-. Y b1’ represents a methyl group which may have a substituent or a cyclic hydrocarbon group having 3 to 24 carbon atoms which may have a substituent, and -CH2- contained in the cyclic hydrocarbon group may be replaced by -O-, -S-, -CO- or -SO2-. nb5 represents an integer of 2 or 3. When nb5 is 2, A 1 is a nitrogen atom, and when nb5 is 3, A 1 is a carbon atom. The groups in a plurality of parentheses may be the same as or different from each other, and the groups in two parentheses may combine to form a ring containing A 1 . Z1 + represents an organic cation.] In the formula (B2), examples of the hydrocarbon group, cyclic hydrocarbon group and substituent of L b2’ and Y b1’ are the same groups as L b2 and Y b1 in the formula (B1-A1). In the formula (B2), L b2’ is a single bond, *-L b23 -, *-L b23-X 2 - or *-L b23 -X 2 -W 2 -X 3 -(L b23 represents a chain hydrocarbon group having 1 to 6 carbon atoms which may have a fluorine atom. X 2 and X 3 each independently represent -O-, -CO-O-, -O-CO-, -O-CO-O- or -O-. W 2 represents an alicyclic hydrocarbon group having 3 to 12 carbon atoms, and -CH2- contained in the alicyclic hydrocarbon group may be replaced by -O- or -CO-. * represents the bonding site with SO2.) is preferably the case. Y b1’ is preferably a methyl group having a fluorine atom or a cyclic hydrocarbon group having 3 to 20 carbon atoms which may have a substituent (-CH2- contained in the cyclic hydrocarbon group may be replaced by -O-, -CO-, -S- or -SO2-).), more preferably a trifluoromethyl group, an alicyclic hydrocarbon group having 3 to 18 carbon atoms which may have a substituent (-CH2- contained in the alicyclic hydrocarbon group may be replaced by -O-, -S-, -CO- or -SO2-), or an aromatic hydrocarbon group having 6 to 18 carbon atoms which may have a substituent. Specifically, it is preferably a trifluoromethyl group or a group represented by Formula (Y1) to Formula (Y36) exemplified in Formula (B1-A1). In Formula (B2), when two -SO2-L b2’ -Y b1’ are combined together to form a ring containing A 1 for example, an anion represented by Formula (B2’) can be mentioned. TIFF2025113197000135.tif21112[In Formula (B2’), A 1 、Y b1’ 、L b2’ and nb5 represent the same meaning as in Formula (B2). W b4 represents a disulfonylimide ring or a disulfonylmethide ring having 2 to 12 carbon atoms which may have a fluorine atom.] W b4The disulfonylimide ring or disulfonylmethide ring preferably has 3 to 12 carbon atoms, more preferably 3 to 6 carbon atoms, and the hydrogen atoms of the methylene groups contained in the ring are preferably replaced by fluorine atoms.

[0176] Examples of the anion of the salt represented by formula (B2) include the following. Among them, the anions represented by formula (B3a-1) and formula (B3a-2) are preferred. TIFF2025113197000136.tif189164 Further, in another form of compound (B), a salt in which the sulfonic acid anion in the salt represented by formula (B1) is replaced with a carboxylic acid anion or the like is also preferably used as compound (B). Examples of the carboxylic acid anion include the following. TIFF2025113197000137.tif41155

[0177] Z1 + Examples of the organic cation of are the same as the cation of ZI in formula (I), and include organic onium cations, organic sulfonium cations, organic iodonium cations, organic ammonium cations, benzothiazolium cations, and organic phosphonium cations. Among these, organic sulfonium cations and organic iodonium cations are preferred, and arylsulfonium cations are more preferred. Specifically, the cations represented by any of formula (b2-1) to formula (b2-5) are included in the same manner as ZI in formula (I). Incidentally, Z1 in formula (B1) or formula (B2) + and ZI in formula (I) + may be the same or different. + and ZI in formula (I) +

[0178] Compound (B) is a combination of the above-mentioned anion and the above-mentioned organic cation, and these can be arbitrarily combined. As the compound (B), preferably, an anion represented by any of Formula (B1a-1) to Formula (B1a-4), Formula (B1a-7) to Formula (B1a-11), Formula (B1a-14) to Formula (B1a-30), Formula (B1a-35) to Formula (B1a-70), Formula (B2a-1) to Formula (B2a-11), Formula (B2a-16) to Formula (B2a-20), and Formula (B3a-1) to Formula (B3a-20), and a combination with cation (b2-1), cation (b2-2), cation (b2-3), cation (b2-4), or cation (b2-5) can be mentioned.

[0179] As the compound (B), preferably, those represented by Formula (B1-1) to Formula (B1-105), Formula (B2-1) to Formula (B2-20), and Formula (B3-1) to Formula (B3-28) can be mentioned. Among them, those containing an arylsulfonium cation are preferable, and those represented by Formula (B1-1) to Formula (B1-3), Formula (B1-5) to Formula (B1-7), Formula (B1-11) to Formula (B1-14), Formula (B1-20) to Formula (B1-26), Formula (B1-29), Formula (B1-31) to Formula (B1-105), Formula (B2-1) to Formula (B2-20), and Formula (B3-1) to Formula (B3-28) are particularly preferable. TIFF2025113197000138.tif229168

[0180] TIFF2025113197000139.tif244156

[0181] TIFF2025113197000140.tif254169

[0182] TIFF2025113197000141.tif252160

[0183] TIFF2025113197000142.tif248163

[0184] TIFF2025113197000143.tif250150

[0185] TIFF2025113197000144.tif187160

[0186] In the resist composition of the present invention, the total content of the acid generator is preferably 0.1% by mass or more and 99.9% by mass or less, more preferably 1% by mass or more and 45% by mass or less, still more preferably 1% by mass or more and 40% by mass or less, and even more preferably 3% by mass or more and 40% by mass or less, based on the solid content of the resist composition. When containing resin (A) or the like, the total content of the acid generator is preferably 1 part by mass or more and 45 parts by mass or less, more preferably 1 part by mass or more and 40 parts by mass or less, still more preferably 3 parts by mass or more and 35 parts by mass or less, per 100 parts by mass of resin (A) or the like. In the resist composition of the present invention, when the acid generator contains salt (I), the content of salt (I) is preferably 0.1% by mass or more and 99.9% by mass or less, more preferably 1% by mass or more and 45% by mass or less, still more preferably 1% by mass or more and 40% by mass or less, and even more preferably 3% by mass or more and 40% by mass or less, based on the solid content of the resist composition. When containing resin (A) or the like, the content of salt (I) is preferably 1 part by mass or more and 45 parts by mass or less, more preferably 1 part by mass or more and 40 parts by mass or less, still more preferably 3 parts by mass or more and 35 parts by mass or less, per 100 parts by mass of resin (A) or the like. In the resist composition of the present invention, when the acid generator contains compound (B), the content of compound (B) is preferably 1% by mass or more and 45% by mass or less, more preferably 1% by mass or more and 40% by mass or less, still more preferably 3% by mass or more and 35% by mass or less, based on the solid content of the resist composition. When containing resin (A) or the like, the content of compound (B) is preferably 1 part by mass or more and 45 parts by mass or less, more preferably 1 part by mass or more and 40 parts by mass or less, still more preferably 3 parts by mass or more and 35 parts by mass or less, per 100 parts by mass of resin (A) or the like.

[0187] <Solvent (E)> The content of the solvent (E) in the resist composition is usually 90% by mass or more and 99.9% by mass or less, preferably 92% by mass or more and 99% by mass or less, more preferably 94% by mass or more and 99% by mass or less. The content of the solvent (E) can be measured by known analytical means such as liquid chromatography or gas chromatography.

[0188] Examples of the solvent (E) include glycol ether esters such as ethyl cellosolve acetate, methyl cellosolve acetate, and propylene glycol monomethyl ether acetate; glycol ethers such as propylene glycol monomethyl ether; esters such as ethyl lactate, butyl acetate, amyl acetate, and ethyl pyruvate; ketones such as acetone, methyl isobutyl ketone, 2-heptanone, and cyclohexanone; cyclic esters such as γ-butyrolact...

Claims

1. An acid generator containing a salt represented by formula (I1) or formula (I2) or a structural unit represented by formula (IP1) or formula (IP2). [In formula (I1), formula (I2), formula (IP1) and formula (IP2), Q １ , Q ２ , R １ and R ２ each independently represents a hydrogen atom, a fluorine atom, a perfluoroalkyl group having 1 to 6 carbon atoms, or an alkyl group having 1 to 6 carbon atoms. z represents any integer from 0 to 6, and when z is 2 or more, a plurality of R １ and R ２ may be the same as or different from each other. X １ represents a binding site with *-CO-O-, *-O-CO-, *-O-CO-O- or *-O- (where * is C(R 1 )(R 2 ), or C(Q 1 )(Q 2 ).). L １ represents an aliphatic hydrocarbon group having 1 to 28 carbon atoms which may have a single bond or a substituent, and -CH 2 - in the aliphatic hydrocarbon group may be replaced by -O-, -S-, -CO-, -SO-, -NR ７ - or -SO ２ - instead. R ７ represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms. R ３ and R ４ each independently represents a halogen atom other than an iodine atom, a haloalkyl group having 1 to 12 carbon atoms or a hydrocarbon group having 1 to 18 carbon atoms, and the hydrocarbon group may have a substituent, and -CH 2 - in the haloalkyl group and the hydrocarbon group may be replaced by -O-, -CO-, -S-, -SO-, -NR ７ - or -SO ２ - may be replaced. m3 represents any integer from 1 to 3, and when m3 is 2 or more, the plurality of Rs ３ may be the same as or different from each other. m4 represents any integer from 0 to 3, and when m4 is 2 or more, the plurality of Rs ４ may be the same as or different from each other. m5 represents any integer from 1 to 3. m6 represents any integer from 1 to 4. R ５ represents a hydrogen atom, a halogen atom, or an alkyl group having 1 to 6 carbon atoms which may have a halogen atom. ZI ＋ represents an organic cation.]

2. R ３ and R ４ The acid generator according to claim 1, wherein R and R are each a fluorine atom, a hydroxy group, an alkoxy group having 1 to 3 carbon atoms, or a perfluoroalkyl group having 1 to 3 carbon atoms.

3. X １ The acid generator according to claim 1, wherein X is *-CO-O- or *-O-CO-O-.

4. L １ The acid generator according to claim 1, wherein L is a single bond or a linear alkanediyl group having 1 to 6 carbon atoms.

5. The acid generator according to claim 1, wherein m3 is 1 and m4 is 0.

6. The acid generator according to claim 1, wherein m5 is 1 and m6 is 2.

7. A resist composition containing the acid generator according to any one of claims 1 to 6.

8. The acid generator is a salt represented by formula (I), The resist composition according to claim 7, further containing a resin containing a structural unit (a1) having an acid-labile group.

9. The acid generator is a resin containing a structural unit represented by formula (IP), The resist composition according to claim 7, wherein the resin further contains a structural unit (a1) having an acid-labile group.

10. The resist composition according to claim 9, further containing a salt represented by formula (I).

11. The resist composition according to claim 8, wherein the structural unit (a1) having an acid-labile group includes at least one selected from the group consisting of a structural unit represented by formula (a1-0), a structural unit represented by formula (a1-1), a structural unit represented by formula (a1-2), a structural unit represented by formula (a1-4), a structural unit represented by formula (a1-5) and a structural unit represented by formula (a1-6). [In formula (a1-0), formula (a1-1) and formula (a1-2), L a01 、 L ａ１ and L ａ２ each independently represents -O- or *-O-(CH ２ ) ｋ１ -CO-O-, k1 represents any integer from 1 to 7, and * represents the bonding site with -CO-. R a01 , R ａ４ and R ａ５ each independently represents a hydrogen atom, a halogen atom, or an alkyl group having 1 to 6 carbon atoms which may have a halogen atom. R a02 , R a03 and R a04 each independently represents an alkyl group having 1 to 8 carbon atoms, an alicyclic hydrocarbon group having 3 to 18 carbon atoms, an aromatic hydrocarbon group having 6 to 18 carbon atoms, or a group combining these, and the alkyl group, the alicyclic hydrocarbon group, and the aromatic hydrocarbon group may have a halogen atom. R ａ６ and R ａ７ each independently represents an alkyl group having 1 to 8 carbon atoms, an alkenyl group having 2 to 8 carbon atoms, an alicyclic hydrocarbon group having 3 to 18 carbon atoms, an aromatic hydrocarbon group having 6 to 18 carbon atoms, or a group formed by combining these, and the alkyl group, the alkenyl group, the alicyclic hydrocarbon group, and the aromatic hydrocarbon group may have a halogen atom. m1 represents any integer from 0 to 14. n1 represents any integer from 0 to 10. n1' represents any integer from 0 to 3. ] [In formula (a1-4), R ａ１ represents a hydrogen atom, a halogen atom, or an alkyl group having 1 to 6 carbon atoms which may have a halogen atom. R ａ１７ represents a halogen atom, a hydroxy group, a carboxy group, an alkyl group having 1 to 6 carbon atoms which may have a halogen atom, an alkoxy group having 1 to 6 carbon atoms, an alkoxyalkyl group having 2 to 12 carbon atoms, an alkoxyalkoxy group having 2 to 12 carbon atoms, an alkylcarbonyl group having 2 to 4 carbon atoms, an alkylcarbonyloxy group having 2 to 4 carbon atoms, an acryloyloxy group or a methacryloyloxy group. A ａ１１ represents a single bond or an alkanediyl group having 1 to 12 carbon atoms, and -CH ２ - in the alkanediyl group may be replaced by -O-, -CO- or -NR ａ１８ -. R ａ１８ represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms. X ａ１ represents a single bond or a carbonyl group. R a34 and R a35 each independently represents a hydrogen atom or a hydrocarbon group having 1 to 12 carbon atoms, and R a36 represents a hydrocarbon group having 1 to 20 carbon atoms, or R a35 and R a36 are bonded to each other to form a divalent hydrocarbon group having 2 to 20 carbon atoms together with the -C-O- to which they are bonded, and the -CH 2 - contained in the hydrocarbon group and the divalent hydrocarbon group may be replaced by -O- or -S-. na1 represents any integer from 1 to 5, and when na1 is 2 or more, the groups in the plurality of parentheses may be the same or different from each other. na11 represents any integer from 0 to 4, and when na11 is 2 or more, a plurality of Rs ａ１７ may be the same as or different from each other. mc represents any integer from 0 to 2. ] [In formula (a1-5), R a8 represents an alkyl group having 1 to 6 carbon atoms which may have a halogen atom, a hydrogen atom or a halogen atom. Z a1 represents a single bond or *-(CH 2 ) h3 -CO-L 54 -, h3 represents any integer from 1 to 4, and * represents the bonding site with L 51 . L 51 、 L 52 、 L 53 and L 54 each independently represents -O- or -S-. s1 represents any integer from 1 to 3. s1' represents any integer from 0 to 3. ] [In formula (a1-6), R a61 represents a hydrogen atom, a halogen atom, or an alkyl group having 1 to 6 carbon atoms which may have a halogen atom. R a6２ 、 R a63 and R a6４ each independently represents an alkyl group having 1 to 6 carbon atoms or a cyclic hydrocarbon group having 3 to 18 carbon atoms which may have a substituent, or R a6２ and R a63 are bonded to each other to form a ring having 3 to 20 carbon atoms together with the carbon atoms to which they are bonded. X a61 represents a single bond, -CO-O-*, or -CO-NR a65 -, where * represents the bonding site with Ar, and R a65 represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms. X a62 represents a single bond, *-O-L a61 -, or *-CO-O-L a62 -, where * represents the bonding site with Ar, and L a61 and L a62 each independently represents an alkanediyl group having 1 to 4 carbon atoms. Ar represents an optionally substituted aromatic hydrocarbon group having 6 to 20 carbon atoms. ]

12. The resist composition according to claim 8, wherein the resin containing a structural unit (a1) having an acid-labile group further contains a structural unit represented by formula (a2-A). [In formula (a2-A), R ａ２ represents a hydrogen atom, a halogen atom, or an alkyl group having 1 to 6 carbon atoms which may have a halogen atom. R ａ２７ represents a halogen atom, a hydroxy group, a carboxy group, an alkyl group having 1 to 6 carbon atoms which may have a halogen atom, an alkoxy group having 1 to 6 carbon atoms, an alkoxyalkyl group having 2 to 12 carbon atoms, an alkoxyalkoxy group having 2 to 12 carbon atoms, an alkylcarbonyl group having 2 to 4 carbon atoms, an alkylcarbonyloxy group having 2 to 4 carbon atoms, an acryloyloxy group or a methacryloyloxy group. A ａ２１ represents a single bond or an alkanediyl group having 1 to 12 carbon atoms, and -CH ２ - in the alkanediyl group may be replaced by -O-, -CO- or -NR ａ２８ -. R ａ２８ represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms. X ａ２ represents a single bond or a carbonyl group. nA2 represents any integer from 1 to 5, and when nA2 is 2 or more, the groups within the plurality of parentheses may be the same as or different from each other. na21 represents any integer from 0 to 4, and when na21 is 2 or more, a plurality of Rs ａ２７ may be the same as or different from each other. mc represents any integer from 0 to 2. ]

13. The resist composition according to claim 7, further comprising a salt that generates an acid having a lower acidity than the acid generated from the acid generator.

14. (1) A step of applying the resist composition according to claim 7 onto a substrate, (2) A step of drying the applied resist composition to form a composition layer, (3) A step of exposing the composition layer, (4) A step of heating the exposed composition layer, and (5) A step of developing the heated composition layer, A method for manufacturing a resist pattern, comprising:

15. A salt represented by formula (I1) or formula (I2). [In formula (I1) and formula (I2), Q １ , Q ２ , R １ and R ２ each independently represents a hydrogen atom, a fluorine atom, a perfluoroalkyl group having 1 to 6 carbon atoms, or an alkyl group having 1 to 6 carbon atoms. z represents an integer of any one of 0 to 6, and when z is 2 or more, a plurality of Rs １ and Rs ２ may be the same as or different from each other. X １ represents a bonding site with *-CO-O-, *-O-CO-, *-O-CO-O- or *-O- (where * is C(R 1 )(R 2 ), or C(Q 1 )(Q 2 ).). L １ represents an aliphatic hydrocarbon group having 1 to 28 carbon atoms which may have a single bond or a substituent, and -CH 2 - in the aliphatic hydrocarbon group may be replaced by -O-, -S-, -CO-, -SO-, -NR ７ - or -SO ２ -. R ７ represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms. R ３ and R ４ each independently represents a halogen atom other than an iodine atom, a haloalkyl group having 1 to 12 carbon atoms, or a hydrocarbon group having 1 to 18 carbon atoms, and the hydrocarbon group may have a substituent, and -CH 2 - in the haloalkyl group and the hydrocarbon group may be replaced by -O-, -CO-, -S-, -SO-, -NR ７ - or -SO ２ - may be replaced. m3 represents any integer from 1 to 3, and when m3 is 2 or more, the plurality of Rs ３ may be the same as or different from each other. m4 represents any integer from 0 to 3. When m4 is 2 or more, the plurality of Rs ４ may be the same as or different from each other. m5 represents any integer from 1 to 3. m6 represents any integer from 1 to 4. R ５ represents a hydrogen atom, a halogen atom, or an alkyl group having 1 to 6 carbon atoms which may have a halogen atom. ZI ＋ represents an organic cation.

16. R ３ and R ４ is a salt according to claim 15, wherein R and R are each a fluorine atom, a hydroxy group, an alkoxy group having 1 to 3 carbon atoms or a perfluoroalkyl group having 1 to 3 carbon atoms.

17. X １ The salt according to claim 15 or 16, wherein X is *-CO-O- or *-O-CO-O-.

18. L １ The salt according to claim 15 or 16, wherein L is a single bond or a linear alkanediyl group having 1 to 6 carbon atoms.

19. The salt according to claim 15 or 16, wherein m3 is 1 and m4 is 0.

20. The salt according to claim 15 or 16, wherein m5 is 1 and m6 is 2.

21. A resin containing a structural unit represented by formula (IP1) or formula (IP2). [In formula (IP1) and formula (IP2), Q １ , Q ２ , R １ and R ２ each independently represents a hydrogen atom, a fluorine atom, a perfluoroalkyl group having 1 to 6 carbon atoms, or an alkyl group having 1 to 6 carbon atoms. z represents an integer from 0 to 6, and when z is 2 or more, a plurality of Rs １ and Rs ２ may be the same as or different from each other. X １ represents a binding site with *-CO-O-, *-O-CO-, *-O-CO-O- or *-O- (where * is C(R 1 )(R 2 ), or C(Q 1 )(Q 2 ).). L １ represents an aliphatic hydrocarbon group having 1 to 28 carbon atoms which may have a single bond or a substituent, and -CH 2 - in the aliphatic hydrocarbon group may be replaced by -O-, -S-, -CO-, -SO-, -NR ７ - or -SO ２ -. R ７ represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms. R ３ and R ４ each independently represents a halogen atom other than an iodine atom, a haloalkyl group having 1 to 12 carbon atoms, or a hydrocarbon group having 1 to 18 carbon atoms, the hydrocarbon group may have a substituent, and -CH 2 - in the haloalkyl group and the hydrocarbon group may be replaced by -O-, -CO-, -S-, -SO-, -NR ７ - or -SO ２ - may be replaced. m3 represents any integer from 1 to 3, and when m3 is 2 or more, the plurality of Rs ３ may be the same as or different from each other. m4 represents any integer from 0 to 3, and when m4 is 2 or more, the plurality of Rs ４ may be the same as or different from each other. m5 represents any integer from 1 to 3. m6 represents any integer from 1 to 4. R ５ represents a hydrogen atom, a halogen atom, or an alkyl group having 1 to 6 carbon atoms which may have a halogen atom. ZI ＋ represents an organic cation.]

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