Resist composition and method for producing resist pattern

Abstract

To provide a resin and a resist composition which form a resist pattern having good line edge roughness (LER).SOLUTION: The resin contains a structural unit represented by formula (I) and a structural unit represented by formula (a2-A). [In the formulae, R1 and Ra50 are each an H atom, a halogen atom or the like; X1 is a group represented by formula (X1-1) to formula (X1-7); A1 and Aa50 are each a single bond or the like; R2 and R3 are each a saturated hydrocarbon group; Xa and Xb are each -O- or -S-; X11 is a divalent saturated hydrocarbon group which may have an F atom; and L1 is a single bond or an optionally substituted hydrocarbon group.]SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a resin, a resist composition containing the resin, a method for producing a resist pattern using the resist composition, and a compound. [Background technology]

[0002] Patent Document 1 describes resist compositions containing resins consisting of structural units derived from the following compounds: TIFF0007742222000001.tif3729 Patent Document 2 also describes a resist composition containing a resin consisting of structural units derived from the following compound. TIFF0007742222000002.tif3322 Patent Document 3 describes a resist composition containing the following resin. TIFF0007742222000003.tif40155 [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-212406 [Patent Document 2] Japanese Patent Application Laid-Open No. 2000-066404 [Patent Document 3] Japanese Patent Application Laid-Open No. 2017-206681 Summary of the Invention [Problem to be solved by the invention]

[0004] The present invention provides a resin that forms a resist pattern with better line edge roughness (LER) than a resist pattern formed using a resist composition containing the above resin. [Means for solving the problem]

[0005] The present invention includes the following inventions. [1] A resin containing a structural unit represented by formula (I) and a structural unit represented by formula (a2-A). TIFF0007742222000004.tif5960[In formula (I), R 1 represents an alkyl group having 1 to 6 carbon atoms which may have one or more halogen atoms, a hydrogen atom, or a halogen atom. X 1 is the formula (X 1 -1)~Formula(X 1 -7). TIFF0007742222000005.tif44140(formula(X 1 -1)~Formula(X 1 -7) Medium, * and ** are bonds, * is R 1 represents the bond to the carbon atom to which it is bonded, and ** represents A 1 ) A 1 is a single bond or * -A 2 -CO-O-. * represents X 1 represents the binding site with A 2 represents an alkanediyl group having 1 to 6 carbon atoms. R 2 and R 3 each independently represents a saturated hydrocarbon group having 1 to 6 carbon atoms. X a and X b each independently represents -O- or -S-. X 11 represents a divalent saturated hydrocarbon group having 1 to 12 carbon atoms which may contain a fluorine atom. L 1 represents a single bond or a hydrocarbon group having 1 to 28 carbon atoms which may have a substituent, and -CH2- contained in the hydrocarbon group may be replaced by -O-, -S-, -SO2- or -CO-. R 4 represents a hydrocarbon group having 1 to 36 carbon atoms which may have a substituent, and -CH2- contained in the hydrocarbon group may be replaced by -O-, -S-, -CO- or -SO2-.] TIFF0007742222000006.tif4653[In formula (a2-A), R a50 represents a hydrogen atom, a halogen atom or an alkyl group having 1 to 6 carbon atoms which may have a halogen atom. R a51 represents 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. A a50 is a single bond or * -X a51 -(A a52 -X a52 ) nb - represents -R a50 represents the bonding site with the carbon atom to which it is bonded. A a52 represents an alkanediyl group having 1 to 6 carbon atoms. X a51 and X a52 each independently represents -O-, -CO-O- or -O-CO-. nb represents 0 or 1. mb represents an integer of 0 to 4. When mb is an integer of 2 or more, a plurality of R a51 may be the same or different from each other.] [2] L 1 The resin according to [1], wherein —CH2— is an alkanediyl group having 1 to 6 carbon atoms, in which —CH2— may be replaced by —O—, —S—, —SO2— or —CO—. [3] X a and X b The resin according to [1] or [2], wherein is —O—. [4] X 11 is a divalent saturated hydrocarbon group having 2 to 6 carbon atoms which may have a fluorine atom. [5] The resin according to any one of [1] to [4], further comprising a structural unit having an acid labile group different from the structural unit derived from the compound represented by formula (I). [6] The resin according to [5], wherein the structural unit having an acid labile group different from the structural unit derived from the compound represented by formula (I) includes at least one selected from the group consisting of a structural unit represented by formula (a1-1) and a structural unit represented by formula (a1-2): TIFF0007742222000007.tif47102 [In formula (a1-1) and formula (a1-2), L a1 and L a2 are each independently -O- or -O-(CH2) k1 represents —CO—O—, k1 represents an integer of 1 to 7, and * represents the bonding site with —CO—. R a4 and R a5 each independently represents a hydrogen atom or a methyl group. 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 combination thereof. m1 represents an integer of 0 to 14. n1 represents an integer of 0 to 10. n1' represents an integer of 0 to 3. [7] A resist composition containing the resin according to any one of [1] to [6] and an acid generator. [8] The resist composition according to [7], wherein the acid generator comprises a salt represented by formula (B1). TIFF0007742222000008.tif2959[In formula (B1), Q b1 and Q b2 each independently represents a fluorine atom or a perfluoroalkyl group having 1 to 6 carbon atoms. L b1 represents a divalent saturated hydrocarbon group having 1 to 24 carbon atoms, wherein -CH2- contained in the divalent saturated hydrocarbon group may be replaced by -O- or -CO-, and wherein a hydrogen atom contained in the divalent saturated hydrocarbon group may be substituted by a fluorine atom or a hydroxy group. Y represents an optionally substituted methyl group or an optionally substituted alicyclic hydrocarbon group having 3 to 24 carbon atoms, and -CH2- contained in the alicyclic hydrocarbon group may be replaced by -O-, -S(O)2- or -CO-. Z + represents an organic cation. [9] The resist composition according to [7] or [8], further comprising a salt that generates an acid that is weaker in acidity than the acid generated from the acid generator.

[10] (1) A step of applying the resist composition according to any one of [7] to [9] onto a substrate; (2) drying the applied composition to form a composition layer; (3) exposing the composition layer to light; (4) heating the composition layer after exposure; and (5) A method for producing a resist pattern, comprising the step of developing the composition layer after heating.

[11] A compound represented by formula (IA). TIFF0007742222000009.tif5963[In formula (IA), R 1 represents an alkyl group having 1 to 6 carbon atoms which may have one or more halogen atoms, a hydrogen atom, or a halogen atom. X A1 is the formula (X 1 -2)~Formula(X 1 -7). TIFF0007742222000010.tif45121(formula(X 1 -2)~Formula(X 1 -7) Medium, * and ** are bonds, * is R 1 represents the bond to the carbon atom to which it is bonded, and ** represents A 1 ) A 1 is a single bond or * -A 2 -CO-O-. * represents X A1 represents the binding site with A 2 represents an alkanediyl group having 1 to 6 carbon atoms. R 2and R 3 each independently represents a saturated hydrocarbon group having 1 to 6 carbon atoms. X a and X b each independently represents -O- or -S-. X 11 represents a divalent saturated hydrocarbon group having 1 to 12 carbon atoms which may contain a fluorine atom. L 1 represents a single bond or a hydrocarbon group having 1 to 28 carbon atoms which may have a substituent, and -CH2- contained in the hydrocarbon group may be replaced by -O-, -S-, -SO2- or -CO-. R 4 represents a hydrocarbon group having 1 to 36 carbon atoms which may have a substituent, and -CH2- contained in the hydrocarbon group may be replaced by -O-, -S-, -CO- or -SO2-.] [Effects of the Invention]

[0006] By using a resist composition containing a resin that includes a structural unit derived from the compound of the present invention, a resist pattern with excellent line edge roughness (LER) can be produced. DETAILED DESCRIPTION OF THE INVENTION

[0007] As used herein, the term "(meth)acrylic monomer" refers to at least one monomer selected from the group consisting of monomers having a "CH=CH-CO-" structure and monomers having a "CH=C(CH)-CO-" structure. Similarly, "(meth)acrylate" and "(meth)acrylic acid" refer to "at least one monomer selected from the group consisting of acrylates and methacrylates" and "at least one monomer selected from the group consisting of acrylic acid and methacrylic acid," respectively. When a structural unit having "CH=C(CH)-CO-" or "CH=CH-CO-" is exemplified, structural units having both groups are also exemplified. Furthermore, groups described herein that can have both a linear and branched structure are acceptable. A "combined group" refers to a group formed by combining two or more of the exemplified groups, and the valence of these groups may vary depending on the bonding form. "Derived from" or "derived from" refers to a polymerizable C=C bond contained in the molecule becoming a -CC- group upon polymerization. When stereoisomers exist, all stereoisomers are included. In this specification, the term "solids content of a resist composition" refers to the sum of all components in the resist composition excluding the solvent (E), which will be described later.

[0008] 〔resin〕 The resin of the present invention is a resin (hereinafter sometimes referred to as "resin (A)") containing a structural unit represented by formula (I) (hereinafter sometimes referred to as structural unit (I)) and a structural unit represented by formula (a2-A) (hereinafter sometimes referred to as structural unit (a2-A)).

[0009] <Structural Unit (I)> TIFF0007742222000011.tif5763 [In formula (I), all symbols have the same meanings as defined above.]

[0010] R 1 represents an alkyl group having 1 to 6 carbon atoms which may have a halogen atom, a hydrogen atom or a halogen atom. R 1Examples 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, an n-pentyl group, and an n-hexyl group, and are preferably alkyl groups having 1 to 4 carbon atoms, and more preferably a methyl group or an ethyl group. R 1 Examples of the halogen atom include a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom. R 1 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 perchloromethyl group, a perbromomethyl group, and a periodomethyl group. R 1 is preferably a hydrogen atom or a methyl group. X 1 is expressed by the following formula (X 1 -1)~Formula(X 1 -7). TIFF0007742222000012.tif44140 expression (X 1 -1)~Formula(X 1 -7) In the above, * and ** are binding sites. * indicates R 1 represents the bonding site with the carbon atom to which it is bonded, and ** represents A 1 represents the binding site with X 1 Among others, the formula (X 1 -1), formula (X 1 -3), formula (X 1 -4), formula (X 1 -7), and a group represented by the formula (X 1 -3), formula (X 1 -4), formula (X 1 A group represented by any one of the following formulae (1)-7) is more preferred.

[0011] R 2 and R 3 each independently represents a saturated hydrocarbon group having 1 to 6 carbon atoms. R 2 and R 3 Examples of the saturated hydrocarbon group having 1 to 6 carbon atoms include chain saturated hydrocarbon groups such as alkyl groups, alicyclic saturated hydrocarbon groups, and groups formed by combining these groups. Examples of the alkyl group include a methyl group, an ethyl group, a propyl group, a butyl group, an isobutyl group, a sec-butyl group, a tert-butyl group, a pentyl group, and a hexyl group. Examples of the alicyclic saturated hydrocarbon group include a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, and a cyclohexyl group. R 2 and R 3 are each independently preferably an alkyl group having 1 to 4 carbon atoms or an alicyclic saturated hydrocarbon group having 3 to 6 carbon atoms, more preferably a methyl group or an ethyl group, and even more preferably a methyl group.

[0012] X 11 represents a divalent saturated hydrocarbon group having 1 to 12 carbon atoms which may contain a fluorine atom. X 11 Examples of the divalent saturated hydrocarbon group include divalent chain saturated hydrocarbon groups such as linear or branched alkanediyl groups, and monocyclic or polycyclic divalent alicyclic saturated hydrocarbon groups, and may be a combination of two or more of these groups. Specific examples include 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, and a dodecane-1,12-diyl group; linear alkanediyl groups having an alkyl group (particularly an alkyl group having 1 to 4 carbon atoms, such as a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, a sec-butyl group, or a tert-butyl group) as a side chain, such as branched alkanediyl groups such as butane-1,3-diyl, 2-methylpropane-1,3-diyl, 2-methylpropane-1,2-diyl, pentane-1,4-diyl, or 2-methylbutane-1,4-diyl; monocyclic divalent alicyclic saturated hydrocarbon groups such as cycloalkanediyl groups, such as cyclobutane-1,3-diyl, cyclopentane-1,3-diyl, cyclohexane-1,2-diyl, 1-methylcyclohexane-1,2-diyl, cyclohexane-1,4-diyl, cyclooctane-1,2-diyl, and cyclooctane-1,5-diyl; Examples include polycyclic divalent alicyclic saturated hydrocarbon groups such as norbornane-2,3-diyl group, norbornane-1,4-diyl group, norbornane-2,5-diyl group, adamantane-1,5-diyl group, and adamantane-2,6-diyl group. The divalent alicyclic hydrocarbon group may also be a group in which any one hydrogen atom has been removed from a monovalent alicyclic hydrocarbon group. The hydrogen atoms contained in the saturated hydrocarbon group may be replaced with fluorine atoms. a and X b It is preferred that the hydrogen atom contained in the carbon atom adjacent to is not replaced with a fluorine atom. Also, X 11 is preferably a saturated hydrocarbon group having 1 to 10 carbon atoms which may have a fluorine atom, more preferably a saturated hydrocarbon group having 1 to 8 carbon atoms which may have a fluorine atom, even more preferably a saturated hydrocarbon group having 2 to 8 carbon atoms which may have a fluorine atom, and even more preferably a saturated hydrocarbon group having 2 to 6 carbon atoms which may have a fluorine atom.

[0013] X a and X b Each of X independently represents -O- or -S-. a and X band are preferably both oxygen atoms. X 11 , X a and X b The ring containing X is preferably a 4- to 12-membered ring, more preferably a 4- to 10-membered ring, further preferably a 5- to 10-membered ring, and particularly preferably a 5- to 9-membered ring. 11 , X a and X b The ring containing is a monocyclic ring.

[0014] A 1 is a single bond or * -A 2 -CO-O-. * represents X 1 represents the binding site with A 2 represents an alkanediyl group having 1 to 6 carbon atoms. A 2 Examples of the alkanediyl group having 1 to 6 carbon atoms include linear alkanediyl groups such as methylene, ethylene, propane-1,3-diyl, butane-1,4-diyl, pentane-1,5-diyl, and hexane-1,6-diyl groups, and branched alkanediyl groups such as ethane-1,1-diyl, propane-1,1-diyl, propane-1,2-diyl, propane-2,2-diyl, pentane-2,4-diyl, 2-methylpropane-1,3-diyl, 2-methylpropane-1,2-diyl, pentane-1,4-diyl, and 2-methylbutane-1,4-diyl groups. A 2 is preferably an alkanediyl group having 1 to 3 carbon atoms, and more preferably a methyl group. A 1 is a single bond or * - is preferably an alkanediyl group having 1 to 3 carbon atoms -CO-O-, and is preferably a single bond or * It is more preferably -CH2-CO-O-.

[0015] L 1 represents a single bond or a hydrocarbon group having 1 to 28 carbon atoms which may have a substituent. L 1Examples of the hydrocarbon group in include a divalent chain hydrocarbon group such as an alkanediyl group, a monocyclic or polycyclic (including spiro ring) divalent alicyclic hydrocarbon group, and a divalent aromatic hydrocarbon group, and may also be a group formed by combining two or more of these groups (for example, a divalent hydrocarbon group formed from an alicyclic hydrocarbon group and an alkanediyl group). Examples of alkanediyl groups include linear alkanediyl groups such as methylene, ethylene, propane-1,3-diyl, butane-1,4-diyl, pentane-1,5-diyl, hexane-1,6-diyl, heptane-1,7-diyl, octane-1,8-diyl, nonane-1,9-diyl, decane-1,10-diyl, undecane-1,11-diyl, dodecane-1,12-diyl, tridecane-1,13-diyl, tetradecane-1,14-diyl, pentadecane-1,15-diyl, hexadecane-1,16-diyl, and heptadecane-1,17-diyl; and Examples of branched alkanediyl groups 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, and a 2-methylbutane-1,4-diyl group. Examples of the monocyclic or polycyclic divalent alicyclic hydrocarbon group include the following groups: The bond can be in any position. The number of carbon atoms in the alicyclic hydrocarbon group is preferably 3 to 18, more preferably 3 to 16, and even more preferably 3 to 12. Specific examples include monocyclic divalent alicyclic hydrocarbon groups such as cycloalkanediyl groups, such as cyclobutane-1,3-diyl, cyclopentane-1,3-diyl, cyclohexane-1,4-diyl, and cyclooctane-1,5-diyl; and Examples thereof include polycyclic divalent alicyclic hydrocarbon groups such as norbornane-1,4-diyl group, norbornane-2,5-diyl group, adamantane-1,5-diyl group, and adamantane-2,6-diyl group. Examples of the divalent aromatic hydrocarbon group include aromatic hydrocarbon groups such as arylene groups such as a phenylene group, a naphthylene group, an anthrylene group, a biphenylene group, a phenanthrylene group, etc. The aromatic hydrocarbon group preferably has 6 to 18 carbon atoms, more preferably 6 to 14 carbon atoms, and even more preferably 6 to 10 carbon atoms.

[0016] Examples of groups combining two or more groups include a group combining an alicyclic hydrocarbon group with an alkanediyl group, a group combining an aromatic hydrocarbon group with an alkanediyl group, and a group combining an alicyclic hydrocarbon group with an aromatic hydrocarbon group. In the combination, two or more types of alicyclic hydrocarbon groups, aromatic hydrocarbon groups, and chain hydrocarbon groups may each be combined. In addition, when any group is R 4 , X a and X b may be bonded to the carbon atom to which is bonded. Examples of groups combining an alicyclic hydrocarbon group and an alkanediyl group include -divalent alicyclic hydrocarbon group-alkanediyl group-, -alkanediyl group-divalent alicyclic hydrocarbon group-alkanediyl group-, and -alkanediyl group-divalent alicyclic hydrocarbon group-. Examples of groups combining an aromatic hydrocarbon group and an alkanediyl group include -divalent aromatic hydrocarbon group-alkanediyl group-, -alkanediyl group-divalent aromatic hydrocarbon group-alkanediyl group-, and -alkanediyl group-divalent aromatic hydrocarbon group-. Examples of groups combining an alicyclic hydrocarbon group and an aromatic hydrocarbon group include -aromatic hydrocarbon group-alicyclic hydrocarbon group-, -alicyclic hydrocarbon group-aromatic hydrocarbon group-, and -alicyclic hydrocarbon group-aromatic hydrocarbon group-alicyclic hydrocarbon group-. L 1 -CH2- contained in the divalent hydrocarbon group having 1 to 28 carbon atoms may be replaced by -O-, -S-, -SO2- or -CO-. L 1When a -CH2- in the hydrocarbon group having 1 to 28 carbon atoms is replaced with -O-, -S-, -SO2-, or -CO-, the number of carbon atoms before the replacement is the number of carbon atoms in the hydrocarbon group. In addition, the number may be 1 or 2 or more. Examples of groups in which -CH2- in a hydrocarbon group is replaced by -O-, -S-, -SO2- or -CO- include a hydroxy group (a group in which -CH2- in a methyl group is replaced by -O-), a carboxy group (a group in which -CH2-CH2- in an ethyl group is replaced by -O-CO-), an alkoxy group (a group in which -CH2- at any position in an alkyl group is replaced by -O-), an alkoxycarbonyl group (a group in which -CH2-CH2- at any position in an alkyl group is replaced by -O-CO-), an alkylcarbonyl group (a group in which -CH2- at any position in an alkyl group is replaced by -CO-), an alkylcarbonyloxy group (a group in which -CH2-CH2- at any position in an alkyl group is replaced by -CO-O-), an alkanediyloxy group (an alkanediyloxy ... Examples of such groups include an alkanediyl group in which -CH- at any position in the alkanediyl group is replaced with -O-), an alkanediyloxycarbonyl group (a group in which -CH- at any position in the alkanediyl group is replaced with -O-CO-), an alkanediylcarbonyl group (a group in which -CH- at any position in the alkanediyl group is replaced with -CO-), an alkanediylcarbonyloxy group (a group in which -CH- at any position in the alkanediyl group is replaced with -CO-O-), an alkylthio group (a group in which -CH- at any position in the alkyl group is replaced with -S-), a cycloalkoxy group, a cycloalkylalkoxy group, an alkoxycarbonyloxy group, an aromatic hydrocarbon group-carbonyloxy group, and a group formed by combining two or more of these groups. Examples of the alkoxy group include alkoxy groups having 1 to 17 carbon atoms, such as a methoxy group, an ethoxy group, a propoxy group, a butoxy group, a pentyloxy group, a hexyloxy group, an octyloxy group, a 2-ethylhexyloxy group, a nonyloxy group, a decyloxy group, and an undecyloxy group. The alkoxycarbonyl group, alkylcarbonyl group and alkylcarbonyloxy group represent groups in which a carbonyl group or carbonyloxy group is bonded to the above-mentioned alkyl group or alkoxy group. 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. The alkanediyloxy group includes an alkanediyloxy group having 1 to 17 carbon atoms, such as a methyleneoxy group, an ethyleneoxy group, a propanediyloxy group, a butanediyloxy group, and a pentanediyloxy group. Examples of the alkanediyloxycarbonyl group include alkanediyloxycarbonyl groups having 2 to 17 carbon atoms, such as a methyleneoxycarbonyl group, an ethyleneoxycarbonyl group, a propanediyloxycarbonyl group, and a butanediyloxycarbonyl group. Examples of the alkanediylcarbonyl group include alkanediylcarbonyl groups having 2 to 18 carbon atoms, such as a methylenecarbonyl group, an ethylenecarbonyl group, a propanediylcarbonyl group, a butanediylcarbonyl group, and a pentanediylcarbonyl group. Examples of the alkanediylcarbonyloxy group include alkanediylcarbonyloxy groups having 2 to 17 carbon atoms, such as a methylenecarbonyloxy group, an ethylenecarbonyloxy group, a propanediylcarbonyloxy group, and a butanediylcarbonyloxy group. The alkylthio group includes alkylthio groups having 1 to 17 carbon atoms, such as a methylthio group, an ethylthio group, and a propylthio group. Examples of cycloalkoxy groups include cycloalkoxy groups having 3 to 17 carbon atoms, such as a cyclohexyloxy group. Examples of cycloalkylalkoxy groups include cycloalkylalkoxy groups having 4 to 17 carbon atoms, such as a cyclohexylmethoxy group. Examples of alkoxycarbonyloxy groups include alkoxycarbonyloxy groups having 2 to 16 carbon atoms, such as a butoxycarbonyloxy group. Examples of aromatic hydrocarbon group-carbonyloxy groups include aromatic hydrocarbon group-carbonyloxy groups having 7 to 17 carbon atoms, such as a benzoyloxy group. Furthermore, examples of groups in which -CH2- in an alicyclic hydrocarbon group is replaced with -O-, -S-, -CO- or -SO2- include the following groups: The bond can be in any position. TIFF0007742222000014.tif46156

[0017] L 1 Examples of the substituent that may be substituted include a hydroxy group, a carboxy group, a halogen atom, a cyano group, an alkyl group having 1 to 12 carbon atoms, an alkoxy group having 1 to 12 carbon atoms, an alkoxycarbonyl group having 2 to 13 carbon atoms, an alkylcarbonyl group having 2 to 13 carbon atoms, an alkylcarbonyloxy group having 2 to 13 carbon atoms, or a group combining these. Examples of the halogen atom include a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom. Examples of the alkyl group having 1 to 12 carbon atoms include a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, an isobutyl group, a tert-butyl group, a pentyl group, a hexyl group, an octyl group, and a nonyl group. Examples of the alkoxy group having 1 to 12 carbon atoms include a methoxy group, an ethoxy group, a propoxy group, a butoxy group, a pentyloxy group, a hexyloxy group, an octyloxy group, a 2-ethylhexyloxy group, a nonyloxy group, a decyloxy group, an undecyloxy group, and a dodecyloxy group. The alkoxycarbonyl group having 2 to 13 carbon atoms, the alkylcarbonyl group having 2 to 13 carbon atoms, and the alkylcarbonyloxy group having 2 to 13 carbon atoms represent groups in which a carbonyl group or a carbonyloxy group is bonded to the above-mentioned alkyl group or alkoxy group. Examples of the alkoxycarbonyl group having 2 to 13 carbon atoms include a methoxycarbonyl group, an ethoxycarbonyl group, and a butoxycarbonyl group. Examples of the alkylcarbonyl group having 2 to 13 carbon atoms include an acetyl group, a propionyl group, and a butyryl group. Examples of the alkylcarbonyloxy group having 2 to 13 carbon atoms include an acetyloxy group, a propionyloxy group, and a butyryloxy group. The substituent 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.

[0018] L 1represents a single bond, an alkanediyl group having 1 to 6 carbon atoms, an alicyclic hydrocarbon group having 3 to 18 carbon atoms (provided that -CH2- contained in the alicyclic hydrocarbon group may be replaced by -O-, -S-, -SO2- or -CO-), an aromatic hydrocarbon group having 6 to 18 carbon atoms, a group formed by combining an alkanediyl group having 1 to 6 carbon atoms with an alicyclic hydrocarbon group having 3 to 18 carbon atoms (provided that -CH2- contained in the alkanediyl group may be replaced by -O- or -CO-, and the alicyclic hydrocarbon group -CH2- contained in the hydrogen group may be replaced by -O-, -S-, -SO2- or -CO-), or a group formed by combining an alkanediyl group having 1 to 6 carbon atoms with an aromatic hydrocarbon group having 6 to 18 carbon atoms (wherein -CH2- contained in the alkanediyl group may be replaced by -O- or -CO-), and a single bond, an alkanediyl group having 1 to 6 carbon atoms, or a group formed by combining an alkanediyl group having 1 to 6 carbon atoms with an alicyclic hydrocarbon group having 3 to 18 carbon atoms is preferred. and more preferably a single bond, an alkanediyl group having 1 to 6 carbon atoms, or a group formed by combining an alkanediyl group having 1 to 6 carbon atoms with an alicyclic hydrocarbon group having 3 to 12 carbon atoms (provided that -CH2- in the alkanediyl group may be replaced with -O- or -CO-, and -CH2- in the alicyclic hydrocarbon group may be replaced with -O-, -S-, -SO2- or -CO-). and a group formed by combining a single bond, a methylene group, an ethylene group, or an alkanediyl group having 1 to 3 carbon atoms with an adamantyl group (provided that at least one of the -CH2- groups contained in the alkanediyl group is replaced with -O- or -CO-).

[0019] R 4 represents a hydrocarbon group having 1 to 36 carbon atoms which may have a substituent. R 4Examples of the hydrocarbon group represented by the formula (I) include aliphatic hydrocarbon groups (chain hydrocarbon groups such as alkyl groups, alkenyl groups, and alkynyl groups, and alicyclic hydrocarbon groups), aromatic hydrocarbon groups, and groups formed by combining these. 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, an n-pentyl group, an n-hexyl group, an n-heptyl group, a 2-ethylhexyl group, an n-octyl group, an n-nonyl group, an n-decyl group, an n-undecyl group, and an n-dodecyl group. Examples of the alkenyl group include ethenyl, propenyl, isopropenyl, butenyl, isobutenyl, tert-butenyl, pentenyl, hexenyl, heptenyl, octynyl, isooctynyl, and nonenyl groups. Examples of the alkynyl group include an ethynyl group, a propynyl group, an isopropynyl group, a butynyl group, an isobutynyl group, a tert-butynyl group, a pentynyl group, a hexynyl group, an octynyl group, and a nonynyl group. The alicyclic hydrocarbon group may be monocyclic, polycyclic, or spirocyclic, and may be saturated or unsaturated. Examples of the monocyclic alicyclic hydrocarbon group include monocyclic cycloalkyl groups such as cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, cyclooctyl, cyclononyl, cyclodecyl, and cyclododecyl. Examples of the polycyclic alicyclic hydrocarbon group include polycyclic cycloalkyl groups such as decahydronaphthyl, adamantyl, and norbornyl. Specific examples of the alicyclic hydrocarbon group include groups represented by the following formulas: TIFF0007742222000015.tif28152 Examples of aromatic hydrocarbon groups include aryl groups such as a phenyl group, a naphthyl group, a biphenyl group, an anthryl group, a phenanthryl group, and a binaphthyl group. In the case of a combined group, the above groups may contain groups with different valences (such as an alkanediyl group, an alkanetriyl group, a cycloalkanediyl group, or a cycloalkanetriyl group). Groups formed by combination include groups combining an aromatic hydrocarbon group with a chain hydrocarbon group (e.g., aromatic hydrocarbon group-alkanediyl group-*, alkyl group-aromatic hydrocarbon group-*), groups combining an alicyclic hydrocarbon group with a chain hydrocarbon group (e.g., alicyclic hydrocarbon group-alkanediyl group-*, alkyl group-alicyclic hydrocarbon group-*, alkyl group-alicyclic hydrocarbon group-alkanediyl group-*), and groups combining an aromatic hydrocarbon group with a alicyclic hydrocarbon group (e.g., aromatic hydrocarbon group-alicyclic hydrocarbon group-*, alicyclic hydrocarbon group-aromatic hydrocarbon group-*). * represents a bonding site. The aromatic hydrocarbon group -alkanediyl group-* includes aralkyl groups such as benzyl group and phenethyl group. Examples of the alkyl group-aromatic hydrocarbon group-* include a tolyl group, a xylyl group, and a cumenyl group. Examples of the alicyclic hydrocarbon group -alkanediyl group-* include cycloalkylalkyl groups such as cyclohexylmethyl group, cyclohexylethyl group, 1-(adamantan-1-yl)methyl group, and 1-(adamantan-1-yl)-1-methylethyl group. Examples of the alkyl group-alicyclic hydrocarbon group-* include cycloalkyl groups having an alkyl group such as a methylcyclohexyl group, a dimethylcyclohexyl group, and a 2-alkyladamantan-2-yl group. Examples of the alkyl group-alicyclic hydrocarbon group-alkanediyl group-* include a methylcyclohexylmethyl group, a dimethylcyclohexylethyl group, and a 2-(alkyladamantan-2-yl)-1-methyl group. Examples of the aromatic hydrocarbon group-alicyclic hydrocarbon group-* include a phenyladamantyl group. Examples of the alicyclic hydrocarbon group-aromatic hydrocarbon group-* include an adamantylphenyl group.

[0020] In addition, two or more types of alicyclic hydrocarbon groups, aromatic hydrocarbon groups, and chain hydrocarbon groups may be combined, and any of the groups may be bonded to adjacent carbon atoms. Examples of groups in which -CH2- in a hydrocarbon group is replaced by -O-, -S-, -SO2- or -CO- include a hydroxy group (a group in which -CH2- in a methyl group is replaced by -O-), a carboxy group (a group in which -CH2-CH2- in an ethyl group is replaced by -O-CO-), an alkoxy group (a group in which -CH2- at any position in an alkyl group is replaced by -O-), an alkoxycarbonyl group (a group in which -CH2-CH2- at any position in an alkyl group is replaced by -O-CO-), an alkylcarbonyl group (a group in which -CH2- at any position in an alkyl group is replaced by -CO-), an alkylcarbonyloxy group (a group in which -CH2-CH2- at any position in an alkyl group is replaced by -CO-O-), an alkanediyloxy group (an alkanediyloxy ... Examples of such groups include an alkanediyl group in which -CH- at any position in the alkanediyl group is replaced with -O-), an alkanediyloxycarbonyl group (a group in which -CH- at any position in the alkanediyl group is replaced with -O-CO-), an alkanediylcarbonyl group (a group in which -CH- at any position in the alkanediyl group is replaced with -CO-), an alkanediylcarbonyloxy group (a group in which -CH- at any position in the alkanediyl group is replaced with -CO-O-), an alkylthio group (a group in which -CH- at any position in the alkyl group is replaced with -S-), a cycloalkoxy group, a cycloalkylalkoxy group, an alkoxycarbonyloxy group, an aromatic hydrocarbon group-carbonyloxy group, and a group formed by combining two or more of these groups. Alkoxy groups, alkoxycarbonyl groups, alkylcarbonyl groups and alkylcarbonyloxy groups, alkanediyloxy groups, alkanediyloxycarbonyl groups, alkanediylcarbonyl groups, alkanediylcarbonyloxy groups, alkylthio groups, cycloalkoxy groups, cycloalkylalkoxy groups, alkoxycarbonyloxy groups, aromatic hydrocarbon groups, carbonyloxy groups, and groups in which -CH2- in an alicyclic hydrocarbon group is replaced by -O-, -S-, -CO-, or -SO2- are not included in the L 1 Examples of the hydrocarbon group substitution include those exemplified above. R4 The hydrocarbon group preferably has 1 to 30 carbon atoms, more preferably 1 to 24 carbon atoms, even more preferably 1 to 18 carbon atoms, and even more preferably 1 to 12 carbon atoms.

[0021] R 4 Examples of the substituent that the hydrocarbon group may have include a halogen atom, a cyano group, a fluorinated alkyl group having 1 to 12 carbon atoms, and an alkyl group having 1 to 12 carbon atoms (wherein —CH2— contained in the alkyl group may be replaced with —O—, —S—, —CO— or —SO2—). Examples of the halogen atom include a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom. Examples of fluorinated alkyl groups having 1 to 12 carbon atoms include fluorinated alkyl groups such as trifluoromethyl group, difluoromethyl group, perfluoroethyl group, 2,2,2-trifluoroethyl group, 1,1,2,2-tetrafluoroethyl group, perfluoropropyl group, 2,2,3,3,3-pentafluoropropyl group, perfluorobutyl group, 1,1,2,2,3,3,4,4-octafluorobutyl group, perfluoropentyl group, 2,2,3,3,4,4,5,5,5-nonafluoropentyl group, and perfluorohexyl group. Examples of the alkyl group having 1 to 12 carbon atoms include a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, an isobutyl group, a tert-butyl group, a pentyl group, a hexyl group, an octyl group, and a nonyl group. When -CH2- in an alkyl group is replaced with -O- or -CO- as a substituent, the number of carbon atoms before the replacement is counted as the total number of carbon atoms in the alkyl group. Examples of groups in which -CH2- in an alkyl group is replaced with -O- or -CO- include a hydroxy group (a group in which -CH2- in a methyl group is replaced with -O-), a carboxyl group (a group in which -CH2-CH2- in an ethyl group is replaced with -O-CO-), an alkoxy group having 1 to 11 carbon atoms (a group in which -CH2- in an alkyl group having 2 to 12 carbon atoms is replaced with -O-), an alkoxy group having 2 to 11 carbon atoms, and a hydroxyl group having 2 to 11 carbon atoms. Examples of such groups include a dicarbonyl group (a group in which -CH2-CH2- in an alkyl group having 3 to 12 carbon atoms is replaced with -O-CO-), an alkylcarbonyl group having 2 to 12 carbon atoms (a group in which -CH2- in an alkyl group having 2 to 12 carbon atoms is replaced with -CO-), and an alkylcarbonyloxy group having 2 to 11 carbon atoms (a group in which -CH2-CH2- in an alkyl group having 3 to 12 carbon atoms is replaced with -CO-O-). Examples of the alkoxy group having 1 to 11 carbon atoms include a methoxy group, an ethoxy group, a propoxy group, a butoxy group, a pentyloxy group, a hexyloxy group, an octyloxy group, a 2-ethylhexyloxy group, a nonyloxy group, a decyloxy group, and an undecyloxy group. The alkoxycarbonyl group having 2 to 11 carbon atoms, the alkylcarbonyl group having 2 to 12 carbon atoms, and the alkylcarbonyloxy group having 2 to 11 carbon atoms represent groups in which a carbonyl group or a carbonyloxy group is bonded to the above-mentioned alkyl group or alkoxy group. Examples of the alkoxycarbonyl group having 2 to 11 carbon atoms include a methoxycarbonyl group, an ethoxycarbonyl group, and a butoxycarbonyl group. Examples of the alkylcarbonyl group having 2 to 12 carbon atoms include an acetyl group, a propionyl group, and a butyryl group. Examples of the alkylcarbonyloxy group having 2 to 11 carbon atoms include an acetyloxy group, a propionyloxy group, and a butyryloxy group. R 4 The hydrocarbon group in may have one or more substituents.

[0022] R 4The alkyl group is preferably an alkyl group having 1 to 12 carbon atoms which may have a substituent (-CH2- contained in the alkyl group may be replaced with -O- or -CO-), 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 with -O-, -S-, -CO- or -SO2-), an alicyclic hydrocarbon group having 6 to 18 carbon atoms which may have a substituent, or a group formed by combining these, more preferably an alkyl group having 1 to 6 carbon atoms, an alicyclic hydrocarbon group having 3 to 12 carbon atoms, or a group formed by combining these, and even more preferably an alkyl group having 1 to 3 carbon atoms.

[0023] Examples of the structural unit (I) include the following: Note that a compound from which the following structural unit (I-1) or the like is derived may be referred to as a compound (I-1) or the like represented by formula (I-1). TIFF0007742222000016.tif208144

[0024] TIFF0007742222000017.tif249165

[0025] In the structural units represented by formulas (I-1) to (I-36), R 1 Specific examples of the structural unit (I) include structural units in which the methyl group corresponding to the following formula is replaced with a hydrogen atom or a halogen atom.

[0026] The content of the structural unit (I) in the resin (A) is usually 1 to 90 mol %, preferably 1 to 85 mol %, more preferably 2 to 80 mol %, even more preferably 2 to 75 mol %, and still more preferably 3 to 70 mol %, based on all structural units.

[0027] <Structural unit (a2-A)> The structural unit (a2-A) is represented by the following formula: TIFF0007742222000018.tif4653[In formula (a2-A), R a50represents a hydrogen atom, a halogen atom, or an alkyl group having 1 to 6 carbon atoms which may have a halogen atom. R a51 represents 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. A a50 is a single bond or *-X a51 -(A a52 -X a52 ) nb - represents -R a50 represents the bonding site with the carbon atom to which it is bonded. A a52 represents an alkanediyl group having 1 to 6 carbon atoms. X a51 and X a52 each independently represents -O-, -CO-O- or -O-CO-. nb represents 0 or 1. mb represents an integer of 0 to 4. When mb is an integer of 2 or more, a plurality of R a51 may be the same or different from each other.]

[0028] R a50 and R a51 Examples of the halogen atom in the formula include a fluorine atom, a chlorine atom, and a bromine atom. R a50 Examples of the alkyl group having 1 to 6 carbon atoms which may have a halogen atom in the formula (I) 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, and a perfluorohexyl group. R a50 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 a51 Examples of the alkyl group in 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. R a51 Examples of the alkoxy group in 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 a methoxy group or an ethoxy group, and even more preferably a methoxy group. R a51 Examples of the alkoxyalkyl group in the formula (I) 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 1 to 8 carbon atoms, more preferably a methoxymethyl group or an ethoxyethyl group, and even more preferably a methoxymethyl group. R a51 Examples of the alkoxyalkoxy group in 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. R a51 Examples of the alkylcarbonyl group in the formula (I) include an acetyl group, a propionyl group, a butyryl group, etc. The alkylcarbonyl group is preferably an alkylcarbonyl group having 2 to 3 carbon atoms, and more preferably an acetyl group. R a51Examples of the alkylcarbonyloxy group in the formula (I) 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. R a51 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. *-X a51 -(A a52 -X a52 ) nb -Examples include *-O-, *-CO-O-, *-O-CO-, *-CO-OA a52 -CO-O-, *-O-CO-A a52 -O-, *-OA a52 -CO-O-, *-CO-OA a52 -O-CO-, *-O-CO-A a52 -O-CO-, and *-CO-O- and *-CO-OA are particularly mentioned. a52 -CO-O- or *-OA a52 -CO-O- is preferred. A a52 Examples of the alkanediyl group in the formula (I) include 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 butane-1,3-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. A a52 is preferably a methylene group or an ethylene group. A a50 is a single bond, *-CO-O- or *-CO-OA a52-CO-O- is preferred, a single bond, *-CO-O- or *-CO-O-CH2-CO-O- is more preferred, and a single bond or *-CO-O- is even more preferred. mb is preferably 0, 1 or 2, more preferably 0 or 1, and even more preferably 0. The hydroxy group is preferably bonded to the o- or p-position of the benzene ring, more preferably to the p-position.

[0029] Examples of the structural unit (a2-A) include structural units derived from monomers described in JP-A Nos. 2010-204634 and 2012-12577. The structural unit (a2-A) includes structural units represented by formulas (a2-2-1) to (a2-2-16) and R in the structural unit (a2-A) in the structural units represented by formulas (a2-2-1) to (a2-2-16). a50 The structural unit (a2-A) includes a structural unit represented by formula (a2-2-1), a structural unit represented by formula (a2-2-3), a structural unit represented by formula (a2-2-6), a structural unit represented by formula (a2-2-1), a structural unit represented by formula (a2-2-3), a structural unit represented by formula (a2-2-6), a structural unit represented by formula (a2-2-8), and a structural unit represented by formulas (a2-2-12) to (a2-2-14), and in these structural units, R in the structural unit (a2-A) a50 It is preferable that the structural unit is a structural unit in which a methyl group corresponding to the following formula is substituted with a hydrogen atom: TIFF0007742222000019.tif64168

[0030] The content of the structural unit (a2-A) in the resin (A) is preferably 5 to 80 mol%, more preferably 10 to 70 mol%, even more preferably 10 to 60 mol%, and even more preferably 10 to 50 mol%, based on all structural units. When the content of the structural unit (a2-A) in the resin (A) is 10 to 50 mol%, the content of the structural unit (I) in the resin (A) is preferably 20 mol% to 90 mol%, and even more preferably 20 mol% to 70 mol%. The structural unit (a2-A) can be incorporated into the resin (A) by, for example, polymerizing the structural unit (a1-4) described below, followed by treatment with an acid such as p-toluenesulfonic acid. Alternatively, the structural unit (a2-A) can be incorporated into the resin (A) by polymerizing the structural unit (a1-4) using acetoxystyrene or the like, followed by treatment with an alkali such as tetramethylammonium hydroxide.

[0031] The resin (A) of the present invention may be a polymer containing one or more structural units other than the structural unit (I) and the structural unit (a2-A). Examples of structural units other than the structural unit (I) and the structural unit (a2-A) include structural units having an acid labile group other than the structural unit (I) (hereinafter sometimes referred to as "structural unit (a1)"), structural units having a halogen atom other than structural units having an acid labile group (hereinafter sometimes referred to as "structural unit (a4)"), structural units not having an acid labile group other than the structural unit (a2-A) (hereinafter sometimes referred to as "structural unit (s)"), and structural units having a non-leaving hydrocarbon group (hereinafter sometimes referred to as "structural unit (a5)"). Here, the acid labile group refers to a group that has a leaving group and that is released upon contact with an acid to form a hydrophilic group (e.g., a hydroxy group or a carboxy group). In particular, the resin (A) preferably contains, in addition to the structural unit (I) and the structural unit (a2-A), a structural unit containing an acid labile group, and more preferably contains at least one structural unit selected from the group consisting of structural units represented by formula (a1-1) and structural units represented by formula (a1-2).

[0032] <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 group contained in the resin (A) is 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)). TIFF0007742222000020.tif1988[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 any of these; or R a1 and R a2 are bonded to each other to form a non-aromatic hydrocarbon ring having 3 to 20 carbon atoms together with the carbon atoms to which they are bonded. ma and na each independently represent 0 or 1, and at least one of ma and na represents 1. * denotes a binding site.] TIFF0007742222000021.tif2171[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 ring having 3 to 20 carbon atoms together with the carbon atom to which they are bonded and X, and -CH2- contained in the hydrocarbon group and the heterocyclic ring may be replaced with -O- or -S-. X represents an oxygen atom or a sulfur atom. na' represents 0 or 1. * denotes a binding site.]

[0033] R a1 , R a2 and R a3 Examples of the alkyl group in include a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group, a heptyl group, and an octyl group. R a1 , Ra2 and R a3 Examples of the alkenyl group in the formula (I) include ethenyl, propenyl, isopropenyl, butenyl, isobutenyl, tert-butenyl, pentenyl, hexenyl, heptenyl, octynyl, isooctynyl, and nonenyl groups. R a1 , R a2 and R a3 The alicyclic hydrocarbon group in may be either monocyclic or polycyclic. Examples of monocyclic alicyclic hydrocarbon groups include cycloalkyl groups such as cyclopentyl, cyclohexyl, cycloheptyl, and cyclooctyl. Examples of polycyclic alicyclic hydrocarbon groups include decahydronaphthyl, adamantyl, and norbornyl groups, as well as the following groups (* indicates a bonding site): a1 , R a2 and R a3 The alicyclic hydrocarbon group preferably has 3 to 16 carbon atoms. TIFF0007742222000022.tif10150R a1 , R a2 and R a3 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 in which the above-mentioned alkyl group and alicyclic hydrocarbon group are combined (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, or 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, or the like), an aromatic hydrocarbon group having an alicyclic hydrocarbon group (a p-cyclohexylphenyl group, a p-adamantylphenyl group, or the like), and an aryl-cycloalkyl group such as a phenylcyclohexyl group. Preferably, ma is 0 and na is 1. R a1 and R a2 -C(R a1 )(R a2 )(R a3 ) includes the following rings. The non-aromatic hydrocarbon ring preferably has 3 to 12 carbon atoms. * represents the bonding site with -O-. TIFF0007742222000023.tif31139

[0034] R a1’ , R a2’ and R a3’ Examples of the hydrocarbon group in include an alkyl group, an alicyclic hydrocarbon group, an aromatic hydrocarbon group, and a group formed by combining these groups. The alkyl group and the alicyclic hydrocarbon group are represented by R a1 , R a2 and R a3 Examples of the groups include the same as those listed in the above. 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 in which the above-mentioned alkyl group and alicyclic hydrocarbon group are combined (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, or 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, or the like), an aromatic hydrocarbon group having an alicyclic hydrocarbon group (a p-cyclohexylphenyl group, a p-adamantylphenyl group, or the like), and an aryl-cycloalkyl group such as a phenylcyclohexyl group. R a2’ and R a3’ When they are bonded to each other to form a heterocyclic group together with the carbon atoms to which they are bonded and X, -C(Ra1’ )(R a2’ )-XR a3’ Examples of the ring include the following: * represents a binding site. TIFF0007742222000024.tif18130R a1’ and R a2’ At least one of these is preferably a hydrogen atom. na' is preferably 0.

[0035] Examples of the group (1) include the following groups. In formula (1), R a1 , R a2 and R a3 is an alkyl group, ma=0, and na=1. The group is preferably a tert-butoxycarbonyl group. In formula (1), R a1 , R a2 together with the carbon atom to which they are attached form an adamantyl group, and 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, and R a3 is an adamantyl group, ma=0, and na=1. Specific examples of the group (1) include the following: * represents a binding site. TIFF0007742222000025.tif171163

[0036] Specific examples of group (2) include the following groups: * represents a binding site. TIFF0007742222000026.tif67162

[0037] The 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.

[0038] Of the (meth)acrylic monomers having an acid labile group, preferred are those having an alicyclic hydrocarbon group having 5 to 20 carbon atoms. When a resin (A) having a structural unit derived from a monomer (a1) having a bulky structure such as an alicyclic hydrocarbon group is used in a resist composition, the resolution of the resist pattern can be improved.

[0039] Examples of structural units derived from a (meth)acrylic monomer having group (1) include 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, at least one structural unit selected from the group consisting of structural unit (a1-1) and structural unit (a1-2) is used. These may be used alone or in combination of two or more. TIFF0007742222000027.tif44140 [In formula (a1-0), formula (a1-1) and formula (a1-2), L a01 , L a1 and L a2 are each independently -O- or -O-(CH2) k1 represents —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 or a methyl group. 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. 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. m1 represents an integer of 0 to 14. n1 represents an integer of 0 to 10. n1' represents an integer of 0 to 3.

[0040] R a01 , R a4 and R a5 is preferably a methyl group. L a01 , L a1 and L a2 is preferably an oxygen atom or —O—(CH2) k01 It is —CO—O— (wherein k01 is preferably an integer of any one of 1 to 4, more preferably 1), and more preferably an oxygen atom. R a02 , R a03 , R a04 , R a6 and R a7 In the above, the alkyl group, alkenyl group, alicyclic hydrocarbon group, aromatic hydrocarbon group and a group formed by combining these groups are R a1 , R a2 and R a3 Examples of the groups include the same groups as those listed in the above. R a02 , R a03 , and R a04 The alkyl group in the formula (I) is preferably an alkyl group having 1 to 6 carbon atoms, more preferably a methyl group or an ethyl group, and even more preferably a methyl group. R a6 and R a7 The alkyl group in the formula (I) 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 even more preferably an ethyl group, an isopropyl group, or a t-butyl group. R a6 and R a7 The alkenyl group in the formula (I) is preferably an alkenyl group having 2 to 6 carbon atoms, and 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 alicyclic hydrocarbon group preferably has 5 to 12 carbon atoms, and more preferably 5 to 10 carbon atoms. R a02 , R a03 , R a04 , R a6 and R a7 The aromatic hydrocarbon group preferably has 6 to 12 carbon atoms, and more preferably 6 to 10 carbon atoms. In the group in which an alkyl group and an alicyclic hydrocarbon group are combined, the total number of carbon atoms in the combination of the alkyl group and the alicyclic hydrocarbon group is preferably 18 or less. In the group in which an alkyl group and an aromatic hydrocarbon group are combined, the total number of carbon atoms in the combination of the alkyl group and the aromatic hydrocarbon group is preferably 18 or less. R a02 and R a03 is preferably an alkyl group having 1 to 6 carbon atoms or an aromatic hydrocarbon group having 6 to 12 carbon atoms, and more preferably a methyl group, an ethyl group, a phenyl group or a naphthyl group. R a04 is preferably an alkyl group having 1 to 6 carbon atoms or an alicyclic hydrocarbon group having 5 to 12 carbon atoms, and more preferably a methyl group, an ethyl group, a cyclohexyl group or an adamantyl group. R a6 and R a7 are each independently preferably an alkyl group having 1 to 6 carbon atoms, an alkenyl group having 2 to 6 carbon atoms, or an aromatic hydrocarbon group having 6 to 12 carbon atoms, 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, and even more preferably an ethyl group, an isopropyl group, a t-butyl group, an ethenyl group, or a phenyl group. m1 is preferably an integer of 0 to 3, and more preferably 0 or 1. n1 is preferably an integer of 0 to 3, and more preferably 0 or 1. n1' is preferably 0 or 1.

[0041] Examples of the structural unit (a1-0) include structural units represented by any one of formulas (a1-0-1) to (a1-0-18) and R a01 and structural units in which a methyl group corresponding to the formula (a1-0-1) is replaced with a hydrogen atom, and structural units represented by any of formulas (a1-0-1) to (a1-0-10), (a1-0-13) and (a1-0-14) are preferred. TIFF0007742222000028.tif95159

[0042] Examples of the structural unit (a1-1) include structural units derived from monomers described in JP-A-2010-204646. Among these, structural units represented by any one of formulas (a1-1-1) to (a1-1-7) and R in the structural unit (a1-1) are preferred. a4 A structural unit in which a methyl group corresponding to the formula (a1-1-1) is replaced with a hydrogen atom is preferred, and a structural unit represented by any one of formulas (a1-1-1) to (a1-1-4) is more preferred. TIFF0007742222000029.tif40166

[0043] The structural unit (a1-2) includes a structural unit represented by any one of formulas (a1-2-1) to (a1-2-12) and R a5 and structural units represented by formula (a1-2-2), formula (a1-2-5), formula (a1-2-6), and formula (a1-2-10) to formula (a1-2-12) are preferred. TIFF0007742222000030.tif75157

[0044] When the resin (A) contains the structural unit (a1-0), the content thereof is usually 5 to 80 mol %, preferably 5 to 75 mol %, and more preferably 10 to 70 mol %, based on all structural units in the resin (A). When the resin (A) contains the structural unit (a1-1) and / or the structural unit (a1-2), the total content thereof is usually 5 to 90 mol %, preferably 5 to 85 mol %, more preferably 10 to 80 mol %, even more preferably 10 to 75 mol %, and still more preferably 10 to 70 mol %, based on all structural units in the resin (A).

[0045] An example of the structural unit (a1) having the group (2) is a structural unit represented by formula (a1-4) (hereinafter, sometimes referred to as "structural unit (a1-4)"). TIFF0007742222000031.tif3854[In formula (a1-4), R a32 represents a hydrogen atom, a halogen atom, or an alkyl group having 1 to 6 carbon atoms which may have a halogen atom. R a33 represents 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. A a30 is a single bond or * -X a31 -(A a32 -X a32 ) nc - represents -R a32 represents the bonding site with the carbon atom to which it is bonded. A a32 represents an alkanediyl group having 1 to 6 carbon atoms. X a31 and X a32 each independently represents -O-, -CO-O- or -O-CO-. nc represents 0 or 1. la represents an integer of 0 to 4. When la is 2 or more, a plurality of R a33 may be the same or different from each other. R a34 and R a35each 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, together with the -CO- to which they are bonded, a divalent hydrocarbon group having 2 to 20 carbon atoms, and the hydrocarbon group and the -CH2- contained in the divalent hydrocarbon group may be replaced with -O- or -S-.]

[0046] R a32 and R a33 Examples of the halogen atom in the formula include a fluorine atom, a chlorine atom, and a bromine atom. R a32 Examples of the alkyl group having 1 to 6 carbon atoms which may have a halogen atom in the formula (I) 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, and a perfluorohexyl group. R a32 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 a33 Examples of the alkyl group in 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. R a33 Examples of the alkoxy group in 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. Ra33 Examples of the alkoxyalkyl group in the formula (I) 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 1 to 8 carbon atoms, more preferably a methoxymethyl group or an ethoxyethyl group, and even more preferably a methoxymethyl group. R a33 Examples of the alkoxyalkoxy group in 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 1 to 8 carbon atoms, and more preferably a methoxyethyl group or an ethoxyethyl group. R a33 Examples of the alkylcarbonyl group in the formula (I) include an acetyl group, a propionyl group, a butyryl group, etc. The alkylcarbonyl group is preferably an alkylcarbonyl group having 2 to 3 carbon atoms, and more preferably an acetyl group. R a33 Examples of the alkylcarbonyloxy group in R 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. a33 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 more preferably a fluorine atom, an iodine atom, a hydroxy group, a methyl group, a methoxy group, or an ethoxyethoxy group.

[0047] *-X a31 -(A a32 -X a32 ) nc -Examples include *-O-, *-CO-O-, *-O-CO-, *-CO-OAa32 -CO-O-, *-O-CO-A a32 -O-, *-OA a32 -CO-O-, *-CO-OA a32 -O-CO-, *-O-CO-A a32 -O-CO-, and *-CO-O- and *-CO-OA are particularly mentioned. a32 -CO-O- or *-OA a32 -CO-O- is preferred.

[0048] A a32 Examples of the alkanediyl group in the formula (I) include 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 butane-1,3-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. A a32 is preferably a methylene group or an ethylene group.

[0049] A a30 is a single bond, *-CO-O- or *-CO-OA a32 -CO-O- is preferred, a single bond, *-CO-O- or *-CO-O-CH2-CO-O- is more preferred, and a single bond or *-CO-O- is even more preferred.

[0050] la is preferably 0, 1 or 2, more preferably 0 or 1, and even more preferably 0. The hydroxy group is preferably bonded to the o- or p-position of the benzene ring, more preferably to the p-position. R a34 , R a35 and R a36 Examples of the hydrocarbon group in include an alkyl group, an alicyclic hydrocarbon group, an aromatic hydrocarbon group, and a group consisting of a combination thereof. 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, and an octyl group. The alicyclic hydrocarbon group may be either monocyclic or polycyclic. Examples of monocyclic alicyclic hydrocarbon groups include cycloalkyl groups such as cyclopentyl, cyclohexyl, cycloheptyl, and cyclooctyl. Examples of polycyclic alicyclic hydrocarbon groups include decahydronaphthyl, adamantyl, and norbornyl groups, as well as the following groups (* indicates a bonding site): TIFF0007742222000032.tif10151 Examples of aromatic hydrocarbon groups 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 in which the above-mentioned alkyl group and alicyclic hydrocarbon group are combined (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, or 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, or the like), an aromatic hydrocarbon group having an alicyclic hydrocarbon group (a p-cyclohexylphenyl group, a p-adamantylphenyl group, or the like), and an aryl-cycloalkyl group such as a phenylcyclohexyl group. In particular, R a36 Examples of the group 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.

[0051] In formula (a1-4), R a32 is preferably a hydrogen atom. R a34 is preferably a hydrogen atom. R a35is preferably a hydrogen atom, an alkyl group having 1 to 12 carbon atoms, or an alicyclic hydrocarbon group having 3 to 12 carbon atoms, and more preferably a methyl group or an ethyl group. R a36 The hydrocarbon group in R 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, and 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. a36 The alkyl group and alicyclic hydrocarbon group in R are preferably unsubstituted. a36 The aromatic hydrocarbon group in is preferably an aromatic ring having an aryloxy group having 6 to 10 carbon atoms. -OC(R a34 )(R a35 )-OR a36 is eliminated on contact with an acid (e.g., p-toluenesulfonic acid) to form a hydroxy group. -OC(R a34 )(R a35 )-OR a36 is preferably bonded to the o- or p-position of the benzene ring, more preferably to the p-position.

[0052] 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 formulas (a1-4-1) to (a1-4-18) and R a32 and more preferably, the structural units represented by formula (a1-4-1) to formula (a1-4-5), formula (a1-4-10), formula (a1-4-13), and formula (a1-4-14), respectively. TIFF0007742222000033.tif99162

[0053] When the resin (A) contains the structural unit (a1-4), the content thereof is preferably 3 to 80 mol %, more preferably 5 to 75 mol %, even more preferably 7 to 70 mol %, even more preferably 7 to 65 mol %, and particularly preferably 10 to 60 mol %, based on the total of all structural units in the resin (A).

[0054] Examples of the structural unit derived from a (meth)acrylic monomer having the group (2) include a structural unit represented by formula (a1-5) (hereinafter, sometimes referred to as "structural unit (a1-5)"). TIFF0007742222000034.tif4658 formula (a1-5), R a8 represents an alkyl group having 1 to 6 carbon atoms which may have one or more halogen atoms, a hydrogen atom, or a halogen atom. Z a1 is a single bond or -(CH2) h3 -CO-L 54 -, h3 represents an integer of 1 to 4, * represents L 51 represents the binding site with L 51 , L 52 , L 53 and L 54 each independently represents -O- or -S-. s1 represents an integer of 1 to 3. s1' represents an integer of 0 to 3.

[0055] Examples of halogen atoms include fluorine atoms and chlorine atoms, with fluorine atoms being preferred. Examples of the alkyl group having 1 to 6 carbon atoms which may have a halogen atom 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, a fluoromethyl group, and a trifluoromethyl group. 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. L52 and L 53 Among these, it is preferred that one is —O— and the other is —S—. s1 is preferably 1. s1' is preferably an integer of 0 to 2. Z a1 is preferably a single bond or —CH2—CO—O—.

[0056] Examples of the structural unit (a1-5) include structural units derived from monomers described in JP-A-2010-61117. Among these, the structural units represented by formulas (a1-5-1) to (a1-5-4) are preferred, and the structural unit represented by formula (a1-5-1) or (a1-5-2) is more preferred. TIFF0007742222000035.tif33133

[0057] When the resin (A) contains the structural unit (a1-5), the content thereof is preferably 1 to 50 mol %, more preferably 3 to 45 mol %, even more preferably 5 to 40 mol %, and even more preferably 5 to 30 mol %, based on the total structural units of the resin (A).

[0058] Further, examples of the structural unit (a1) include the following structural units. TIFF0007742222000036.tif31165

[0059] When the resin (A) contains structural units such as (a1-3-1) to (a1-3-7) above, the content thereof is preferably 10 to 95 mol %, more preferably 15 to 90 mol %, even more preferably 20 to 85 mol %, even more preferably 20 to 70 mol %, and particularly preferably 20 to 60 mol %, based on the total structural units of the resin (A).

[0060] Further, examples of the structural unit (a1) include the following structural units. TIFF0007742222000037.tif5295 When resin (A) contains structural units such as (a1-6-1) to (a1-6-3) above, the content thereof is preferably 10 to 60 mol %, more preferably 15 to 55 mol %, even more preferably 20 to 50 mol %, even more preferably 20 to 45 mol %, and particularly preferably 20 to 40 mol %, based on the total structural units of resin (A).

[0061] <Structural unit(s)> The structural unit (s) is derived from a monomer (hereinafter sometimes referred to as "monomer (s)") that does not have an acid labile group. As the monomer from which the structural unit (s) is derived, a monomer that does not have an acid labile group known in the resist field can be used. The structural unit (s) preferably has a hydroxy group or a lactone ring. By using a resin having a structural unit that has a hydroxy group but no acid labile group (hereinafter sometimes referred to as "structural unit (a2)") and / or a structural unit that has a lactone ring but 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 adhesion to the substrate can be improved.

[0062] <Structural unit (a2)> The hydroxy group contained in the structural unit (a2) may be an alcoholic hydroxy group, such as the structural unit (a2-1) described below. The structural unit (a2) may contain one type alone or two or more types.

[0063] An example of the structural unit (a2) having an alcoholic hydroxy group is a structural unit represented by formula (a2-1) (hereinafter, sometimes referred to as "structural unit (a2-1)"). TIFF0007742222000038.tif4460 formula (a2-1), L a3 is -O- or *-O-(CH2) k2 represents -CO-O-, k2 represents an integer of 1 to 7. * represents the bonding position with —CO—. R a14 represents a hydrogen atom or a methyl group. R a15 and R a16 each independently represents a hydrogen atom, a methyl group, or a hydroxy group. o1 represents an integer between 0 and 10.

[0064] In equation (a2-1), L a3 is preferably -O-, -O-(CH2) f1 It is —CO—O— (wherein f1 represents an integer of 1 to 4), and more preferably —O—. R a14 is preferably a methyl group. R a15 is preferably a hydrogen atom. R a16 is preferably a hydrogen atom or a hydroxy group. o1 is preferably an integer of 0 to 3, and more preferably 0 or 1.

[0065] Examples of the structural unit (a2-1) include structural units derived from monomers described in JP 2010-204646 A. A structural unit represented by any one of formulas (a2-1-1) to (a2-1-6) is preferred, a structural unit represented by any one of formulas (a2-1-1) to (a2-1-4) is more preferred, and a structural unit represented by formula (a2-1-1) or formula (a2-1-3) is even more preferred. TIFF0007742222000039.tif49136

[0066] When the resin (A) contains the structural unit (a2-1), the content thereof is usually 1 to 45 mol %, 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 %, based on all structural units of the resin (A).

[0067] <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 a condensed ring of a monocyclic lactone ring with another ring. Preferred examples include a γ-butyrolactone ring, an adamantane lactone ring, or a bridged ring containing a γ-butyrolactone ring structure (for example, a structural unit represented by the following formula (a3-2)).

[0068] The structural unit (a3) ​​is preferably a structural unit represented by formula (a3-1), formula (a3-2), formula (a3-3), or formula (a3-4). One of these may be contained alone, or two or more may be contained. TIFF0007742222000040.tif51163 [In formula (a3-1), formula (a3-2), formula (a3-3) and formula (a3-4), L a4 , L a5 and L a6 are each independently -O- or -O-(CH2) k3 It represents a group represented by —CO—O— (k3 represents an integer of 1 to 7). L a7 -O-, *-OL a8 -O-, *-OL a8 -CO-O-, *-OL a8 -CO-OL a9 -CO-O- or *-OL a8 -O-CO-L a9 Represents -O-. L a8 and L a9 each independently represents an alkanediyl group having 1 to 6 carbon atoms. * indicates the bonding position with the carbonyl group. R a18 , R a19 and R a20 each independently represents a hydrogen atom or a methyl group. R a24 represents an alkyl group having 1 to 6 carbon atoms which may have one or more halogen atoms, a hydrogen atom, or a halogen atom. X a3 represents -CH2- or an oxygen atom. Ra21 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 of 0 to 5. q1 represents an integer of 0 to 3. r1 represents an integer of 0 to 3. w1 represents an integer of 0 to 8. When p1, q1, r1 and / or w1 are 2 or more, multiple R a21 , R a22 , R a23 and / or R a25 may be the same or different.]

[0069] R a21 , R a22 , R a23 and R a25 Examples of the aliphatic hydrocarbon group in include alkyl groups such as a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, a sec-butyl group, and a tert-butyl group. R a24 Examples of the halogen atom in the formula include a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom. R a24 Examples of the alkyl group in 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, and preferably an alkyl group having 1 to 4 carbon atoms, and more preferably a methyl group or an ethyl group. R a24 Examples of the alkyl group having a halogen atom in the formula (I) 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.

[0070] L a8 and L a9 Examples of the alkanediyl group in the formula (I) include 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 butane-1,3-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.

[0071] In formulas (a3-1) to (a3-3), L a4 ~L a6 are each independently preferably -O- or -O-(CH2) k3 In -CO-O-, k3 is a group in which k3 is any integer of 1 to 4, more preferably -O- and *-O-CH2-CO-O-, and even more preferably an oxygen atom. R a18 ~R a21 is preferably a methyl group. R a22 and R a23 are each independently preferably a carboxy group, a cyano group, or a methyl group. p1, q1 and r1 each independently represent an integer of preferably 0 to 2, and more preferably 0 or 1.

[0072] In formula (a3-4), R a24 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 a25 is preferably a carboxy group, a cyano group or a methyl group. L a7 is preferably -O- or *-OL a8 It is —CO—O—, and more preferably —O—, —O—CH 2 —CO—O— or —O—C 2 H 4 —CO—O—. w1 is preferably an integer of 0 to 2, and more preferably 0 or 1. In particular, the formula (a3-4) is preferably the formula (a3-4)'. TIFF0007742222000041.tif4558(in the formula, R a24 , L a7 has the same meaning as above.)

[0073] Examples of the structural unit (a3) ​​include structural units derived from monomers described in JP 2010-204646 A, JP 2000-122294 A, and JP 2012-41274 A. Examples of the structural unit (a3) ​​include structural units represented by any of formulas (a3-1-1), (a3-1-2), (a3-2-1), (a3-2-2), (a3-3-1), (a3-3-2), and (a3-4-1) to (a3-4-12), and in the structural units, R in formulas (a3-1) to (a3-4) a18 , R a19 , R a20 and R a24 A structural unit in which a methyl group corresponding to the following is replaced with a hydrogen atom is preferred.

[0074] TIFF0007742222000042.tif118169

[0075] When the resin (A) contains the structural unit (a3), the total content thereof is usually 5 to 70 mol %, preferably 10 to 65 mol %, and more preferably 10 to 60 mol %, based on all structural units in the resin (A). Furthermore, the content of the structural unit (a3-1), the structural unit (a3-2), the structural unit (a3-3), or the structural unit (a3-4) is preferably 5 to 60 mol %, more preferably 5 to 50 mol %, and even more preferably 10 to 50 mol %, based on the total structural units of the resin (A).

[0076] <Structural unit (a4)> Examples of the structural unit (a4) include the following structural units. TIFF0007742222000043.tif3168[In formula (a4), R 41 represents a hydrogen atom or a methyl group. R 42 represents a saturated hydrocarbon group having 1 to 24 carbon atoms and containing a halogen atom, and -CH2- contained in the saturated hydrocarbon group may be replaced with -O- or -CO-.] R 42 Examples of the saturated hydrocarbon group represented by the formula (I) include a chain saturated hydrocarbon group, a monocyclic or polycyclic alicyclic saturated hydrocarbon group, and a group formed by combining these groups.

[0077] Examples of the chain saturated hydrocarbon 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, a decyl group, a dodecyl group, a pentadecyl group, a hexadecyl group, a heptadecyl group, and an octadecyl group. Examples of the monocyclic or polycyclic alicyclic saturated hydrocarbon group include cycloalkyl groups such as a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, and a cyclooctyl group; and polycyclic alicyclic saturated hydrocarbon groups such as a decahydronaphthyl group, an adamantyl group, a norbornyl group, and the following groups (* indicates a bonding site): TIFF0007742222000044.tif10146 Examples of groups formed by this combination include groups formed by combining one or more alkyl groups or one or more alkanediyl groups with one or more alicyclic saturated hydrocarbon groups, such as -alkanediyl group-alicyclic saturated hydrocarbon group, -alicyclic saturated hydrocarbon group-alkyl group, and -alkanediyl group-alicyclic saturated hydrocarbon group-alkyl group.

[0078] Examples of the structural unit (a4) include a structural unit represented by formula (a4-0), a structural unit represented by formula (a4-1), and a structural unit represented by formula (a4-4). TIFF0007742222000045.tif4450[In formula (a4-0), R 54 represents a hydrogen atom or a methyl group. L4a represents a single bond or an alkanediyl group having 1 to 4 carbon atoms. L 3a represents a perfluoroalkanediyl group having 1 to 8 carbon atoms or a perfluorocycloalkanediyl group having 3 to 12 carbon atoms. R 64 represents a hydrogen atom or a fluorine atom.

[0079] L 4a Examples of the alkanediyl group in the formula (I) include linear alkanediyl groups such as a methylene group, an ethylene group, a propane-1,3-diyl group, and a butane-1,4-diyl group, and branched alkanediyl groups such as an ethane-1,1-diyl group, a propane-1,2-diyl group, a butane-1,3-diyl group, a 2-methylpropane-1,3-diyl group, and a 2-methylpropane-1,2-diyl group.

[0080] L 3a Examples of the perfluoroalkanediyl group in the formula (I) 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, perfluorohexane-1,6-diyl group, perfluorohexane-2,2-diyl group, perfluorohexane-3,3-diyl group, perfluoroheptane-1,7-diyl group, perfluoroheptane-2,2-diyl group, perfluoroheptane-3,4-diyl group, perfluoroheptane-4,4-diyl group, perfluorooctane-1,8-diyl group, perfluorooctane-2,2-diyl group, perfluorooctane-3,3-diyl group, and perfluorooctane-4,4-diyl group. L 3aExamples of the perfluorocycloalkanediyl group in the formula (I) include a perfluorocyclohexanediyl group, a perfluorocyclopentanediyl group, a perfluorocycloheptanediyl group, and a perfluoroadamantanediyl group.

[0081] L 4a is preferably a single bond, a methylene group, or an ethylene group, and more preferably a single bond or a methylene group. L 3a is preferably a perfluoroalkanediyl group having 1 to 6 carbon atoms, and more preferably a perfluoroalkanediyl group having 1 to 3 carbon atoms.

[0082] The structural unit (a4-0) includes the structural units shown below and R in the structural unit (a4-0) in the structural units shown below. 54 The structural unit in which a methyl group corresponding to the above is replaced with a hydrogen atom is an example. TIFF0007742222000046.tif97169

[0083] TIFF0007742222000047.tif4867[In formula (a4-1), R a41 represents a hydrogen atom or a methyl group. R a42 represents a saturated hydrocarbon group having 1 to 20 carbon atoms which may have a substituent, and -CH2- contained in the saturated hydrocarbon group may be replaced with -O- or -CO-. A a41 represents an alkanediyl group having 1 to 6 carbon atoms which may have a substituent or a group represented by formula (a-g1), a41 and R a42 At least one of the groups has a halogen atom (preferably a fluorine atom) as a substituent. TIFF0007742222000048.tif1594 [In formula (a-g1), s represents 0 or 1. A a42 and A a44each independently represents a divalent saturated hydrocarbon group having 1 to 5 carbon atoms which may have a substituent. A a43 represents a single bond or a divalent saturated hydrocarbon group having 1 to 5 carbon atoms which may have a substituent. X a41 and X a42 each independently represents -O-, -CO-, -CO-O- or -O-CO-. However, A a42 , A a43 , A a44 , X a41 and X a42 The total number of carbon atoms is 7 or less. * indicates the binding site, and the * on the right is -O-CO-R a42 ]

[0084] R a42 Examples of the saturated hydrocarbon group in include chain hydrocarbon groups, monocyclic or polycyclic saturated alicyclic hydrocarbon groups, and groups formed by combining these groups.

[0085] Examples of the chain hydrocarbon 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, a decyl group, a dodecyl group, a pentadecyl group, a hexadecyl group, a heptadecyl group, and an octadecyl group. Examples of the monocyclic or polycyclic saturated alicyclic hydrocarbon group include cycloalkyl groups such as a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, and a cyclooctyl group; and polycyclic alicyclic hydrocarbon groups such as a decahydronaphthyl group, an adamantyl group, a norbornyl group, and the following groups (* indicates a bonding site): TIFF0007742222000049.tif10160 Examples of groups formed by this combination include groups formed by combining one or more alkyl groups or one or more alkanediyl groups with one or more saturated alicyclic hydrocarbon groups, such as -alkanediyl group-saturated alicyclic hydrocarbon group, -saturated alicyclic hydrocarbon group-alkyl group, and -alkanediyl group-saturated alicyclic hydrocarbon group-alkyl group.

[0086] R a42 The substituents included in the formula (a-g3) include at least one selected from the group consisting of halogen atoms and groups represented by formula (a-g3): Examples of halogen atoms include fluorine atoms, chlorine atoms, bromine atoms, and iodine atoms, and a fluorine atom is preferred. TIFF0007742222000050.tif855[In formula (a-g3), X a43 represents an oxygen atom, a carbonyl group, *-O-CO- or *-CO-O-. A a45 represents a saturated hydrocarbon group having 1 to 17 carbon atoms which may have a halogen atom. * denotes R a42 represents the binding site with However, R a42 -X a43 -A a45 In R a42 If A does not have a halogen atom, a45 represents a saturated hydrocarbon group having 1 to 17 carbon atoms and at least one halogen atom.

[0087] A a45 Examples of the saturated hydrocarbon group in the formula (I) include alkyl groups such as a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group, a heptyl group, an octyl group, a decyl group, a dodecyl group, a pentadecyl group, a hexadecyl group, a heptadecyl group, and an octadecyl group; Examples include monocyclic alicyclic hydrocarbon groups such as cyclopentyl, cyclohexyl, cycloheptyl, and cyclooctyl groups; and polycyclic alicyclic hydrocarbon groups such as decahydronaphthyl, adamantyl, and norbornyl groups, and the following groups (* indicates a bonding site): TIFF0007742222000051.tif10160 Examples of groups formed by 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, and -alkanediyl group-alicyclic hydrocarbon group-alkyl group.

[0088] R a42 is preferably a saturated hydrocarbon group which may have a halogen atom, and more preferably a saturated hydrocarbon group having an alkyl group having a halogen atom and / or a group represented by formula (a-g3). R a42 When is a saturated hydrocarbon group having a halogen atom, it is preferably a saturated hydrocarbon group having a fluorine atom, more preferably a perfluoroalkyl group or a perfluorocycloalkyl group, still more preferably a perfluoroalkyl group having 1 to 6 carbon atoms, and particularly preferably a perfluoroalkyl group having 1 to 3 carbon atoms. Examples of perfluoroalkyl groups include a perfluoromethyl group, a perfluoroethyl group, a perfluoropropyl group, a perfluorobutyl group, a perfluoropentyl group, a perfluorohexyl group, a perfluoroheptyl group, and a perfluorooctyl group. Examples of perfluorocycloalkyl groups include a perfluorocyclohexyl group. R a42 is a saturated hydrocarbon group having a group represented by formula (a-g3), the number of carbon atoms contained in the group represented by formula (a-g3) is a42 The total number of carbon atoms is preferably 15 or less, more preferably 12 or less. When the group represented by formula (a-g3) is contained as a substituent, the number thereof is preferably 1.

[0089] R a42 is a saturated hydrocarbon group having a group represented by formula (a-g3), R a42 is more preferably a group represented by formula (a-g2). TIFF0007742222000052.tif873[In formula (a-g2), A a46 represents a divalent saturated hydrocarbon group having 1 to 17 carbon atoms which may have a halogen atom. X a44 represents **-O-CO- or **-CO-O- (** represents A a46 represents the binding site with ). A a47represents a saturated hydrocarbon group having 1 to 17 carbon atoms which may have a halogen atom. However, A a46 , A a47 and X a44 The total number of carbon atoms in A is 18 or less. a46 and A a47 At least one of the groups has at least one halogen atom. * indicates the bonding site with the carbonyl group.]

[0090] A a46 The saturated hydrocarbon group preferably has 1 to 6 carbon atoms, and more preferably 1 to 3 carbon atoms. A a47 The saturated hydrocarbon group preferably has 4 to 15 carbon atoms, more preferably 5 to 12 carbon atoms, and A a47 is more preferably a cyclohexyl group or an adamantyl group.

[0091] A preferred structure of the group represented by formula (a-g2) is the following structure (* indicates the bonding site with the carbonyl group): TIFF0007742222000053.tif14160

[0092] A a41 Examples of the alkanediyl group in the formula (I) include linear alkanediyl groups such as methylene, ethylene, propane-1,3-diyl, butane-1,4-diyl, pentane-1,5-diyl, and hexane-1,6-diyl; and branched alkanediyl groups such as propane-1,2-diyl, butane-1,3-diyl, 2-methylpropane-1,2-diyl, 1-methylbutane-1,4-diyl, and 2-methylbutane-1,4-diyl. A a41 Examples of the substituent in the alkanediyl group represented by the formula (I) include a hydroxy group and an alkoxy group having 1 to 6 carbon atoms. A a41 is preferably an alkanediyl group having 1 to 4 carbon atoms, more preferably an alkanediyl group having 2 to 4 carbon atoms, and even more preferably an ethylene group.

[0093] A in the group represented by formula (a-g1) a42 , A a43 and A a44 Examples of the divalent saturated hydrocarbon group represented by include a linear or branched alkanediyl group, a monocyclic divalent alicyclic saturated hydrocarbon group, and a divalent saturated hydrocarbon group formed by combining an alkanediyl group with a divalent alicyclic saturated hydrocarbon group. Specific examples include 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, and a 2-methylpropane-1,2-diyl group. A a42 , A a43 and A a44 Examples of the substituent of the divalent saturated hydrocarbon group represented by the formula include a hydroxy group and an alkoxy group having 1 to 6 carbon atoms. Preferably, s is 0.

[0094] In the group represented by formula (a-g1), X a42 In the following examples, * and ** each represent a bonding site, and ** represents -O-CO-R a42 This is the binding site for TIFF0007742222000054.tif46140

[0095] The structural unit represented by formula (a4-1) includes the structural units shown below and R in the structural unit represented by formula (a4-1) in the structural units shown below. a41 The structural unit in which a methyl group corresponding to the above is replaced with a hydrogen atom is an example. TIFF0007742222000055.tif102149

[0096] TIFF0007742222000056.tif132150

[0097] Examples of the structural unit represented by formula (a4-1) include a structural unit represented by formula (a4-2) and a structural unit represented by formula (a4-3). TIFF0007742222000057.tif4459[In formula (a4-2), R f5 represents a hydrogen atom or a methyl group. L 44 represents an alkanediyl group having 1 to 6 carbon atoms, and -CH2- contained in the alkanediyl group may be replaced with -O- or -CO-. R f6 represents a saturated hydrocarbon group having 1 to 20 carbon atoms and containing a fluorine atom. However, L 44 and R f6 The maximum total carbon number is 21.]

[0098] L 44 The alkanediyl group having 1 to 6 carbon atoms is A a41 Examples of the groups include the same groups as those exemplified in R f6 The saturated hydrocarbon group of R 42 Examples of the groups include the same groups as those exemplified in L 44 The alkanediyl group in the formula (I) is preferably an alkanediyl group having 2 to 4 carbon atoms, more preferably an ethylene group.

[0099] Examples of the structural unit represented by formula (a4-2) include structural units represented by formulas (a4-1-1) to (a4-1-11). f5 The structural unit represented by formula (a4-2) also includes a structural unit in which a methyl group corresponding to the following is replaced with a hydrogen atom:

[0100] TIFF0007742222000058.tif5873[In formula (a4-3), R f7 represents a hydrogen atom or a methyl group. L 5 represents an alkanediyl group having 1 to 6 carbon atoms. A f13represents a divalent saturated hydrocarbon group having 1 to 18 carbon atoms which may contain a fluorine atom. X f12 represents *-O-CO- or *-CO-O- (* represents A f13 represents the binding site with ). A f14 represents a saturated hydrocarbon group having 1 to 17 carbon atoms which may contain a fluorine atom. However, A f13 and A f14 At least one of L has a fluorine atom, 5 , A f13 and A f14 The total number of carbon atoms in a molecule is limited to 20.

[0101] L 5 The alkanediyl group in a41 Examples of the alkanediyl group include the same groups as those exemplified as the alkanediyl group.

[0102] A f13 The divalent saturated hydrocarbon group optionally having a fluorine atom in the formula (I) is preferably a divalent chain saturated hydrocarbon group optionally having a fluorine atom and a divalent alicyclic saturated hydrocarbon group optionally having a fluorine atom, and more preferably a perfluoroalkanediyl group. Examples of the divalent chain saturated hydrocarbon group which may have a fluorine atom include alkanediyl groups such as a methylene group, an ethylene group, a propanediyl group, a butanediyl group, and a pentanediyl group; and perfluoroalkanediyl groups such as a difluoromethylene group, a perfluoroethylene group, a perfluoropropanediyl group, a perfluorobutanediyl group, and a perfluoropentanediyl group. The divalent alicyclic saturated hydrocarbon group optionally having a fluorine atom may be either monocyclic or polycyclic. Examples of the monocyclic group include a cyclohexanediyl group and a perfluorocyclohexanediyl group. Examples of the polycyclic group include an adamantanediyl group, a norbornanediyl group, and a perfluoroadamantanediyl group.

[0103] A f14The saturated hydrocarbon group and the saturated hydrocarbon group which may have a fluorine atom are R a42 Among these, 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, Preferred are fluorinated alkyl groups such as a hexyl group, a perfluorohexyl group, a heptyl group, a perfluoroheptyl group, an octyl group, and a perfluorooctyl group, 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, and a perfluoroadamantylmethyl group.

[0104] In formula (a4-3), L 5 is preferably an ethylene group. A f13 The divalent saturated hydrocarbon group is preferably a group containing a divalent chain saturated hydrocarbon group having 1 to 6 carbon atoms and a divalent alicyclic saturated hydrocarbon group having 3 to 12 carbon atoms, and more preferably a divalent chain saturated hydrocarbon group having 2 to 3 carbon atoms. A f14 The saturated hydrocarbon group is preferably a group containing a chain saturated hydrocarbon group having 3 to 12 carbon atoms and a group containing an alicyclic saturated hydrocarbon group having 3 to 12 carbon atoms, and more preferably a group containing a chain saturated hydrocarbon group having 3 to 10 carbon atoms and a group containing an alicyclic saturated hydrocarbon group having 3 to 10 carbon atoms. f14 is preferably a group containing an alicyclic saturated hydrocarbon group having 3 to 12 carbon atoms, and more preferably a cyclopropylmethyl group, a cyclopentyl group, a cyclohexyl group, a norbornyl group, or an adamantyl group.

[0105] Examples of the structural unit represented by formula (a4-3) include structural units represented by formulas (a4-1'-1) to (a4-1'-11). f7 The structural unit represented by formula (a4-3) also includes a structural unit in which a methyl group corresponding to the following is replaced with a hydrogen atom:

[0106] The structural unit (a4) also includes a structural unit represented by formula (a4-4). TIFF0007742222000059.tif4669[In formula (a4-4), R f21 represents a hydrogen atom or a methyl group. A f21 is -(CH2) j1 -, -(CH2) j2 -O-(CH2) j3 -or-(CH2) j4 -CO-O-(CH2) j5 - represents. j1 to j5 each independently represent an integer of 1 to 6. R f22 represents a saturated hydrocarbon group having 1 to 10 carbon atoms and containing a fluorine atom.]

[0107] R f22 The saturated hydrocarbon group of R a42 R f22 is preferably an alkyl group having 1 to 10 carbon atoms and containing a fluorine atom or an alicyclic saturated hydrocarbon group having 1 to 10 carbon atoms and containing a fluorine atom, more preferably an alkyl group having 1 to 10 carbon atoms and containing a fluorine atom, and even more preferably an alkyl group having 1 to 6 carbon atoms and containing a fluorine atom.

[0108] In formula (a4-4), A f21 As -(CH2) j1 - is preferred, an ethylene group or a methylene group is more preferred, and a methylene group is even more preferred.

[0109] Examples of the structural unit represented by formula (a4-4) include the following structural units and structural units represented by the following formulas: f21 The structural unit in which a methyl group corresponding to the above is replaced with a hydrogen atom is an example. TIFF0007742222000060.tif88163

[0110] When the resin (A) has the structural unit (a4), the content thereof is preferably 1 to 20 mol %, more preferably 2 to 15 mol %, and even more preferably 3 to 10 mol %, based on all structural units in the resin (A).

[0111] <Structural unit (a5)> The non-leaving hydrocarbon group contained in the structural unit (a5) may be a group containing a linear, branched, or cyclic hydrocarbon group, and among these, the structural unit (a5) is preferably a group containing an alicyclic hydrocarbon group. Examples of the structural unit (a5) include a structural unit represented by formula (a5-1). TIFF0007742222000061.tif3655[In 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 a hydrogen atom 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 with -O- or -CO-.]

[0112] R 52 The alicyclic hydrocarbon group in may be either monocyclic or polycyclic. Examples of monocyclic alicyclic hydrocarbon groups include cyclopropyl, cyclobutyl, cyclopentyl, and cyclohexyl. Examples of polycyclic alicyclic hydrocarbon groups include adamantyl and norbornyl. Examples of the aliphatic hydrocarbon group having 1 to 8 carbon atoms include alkyl groups such as methyl, ethyl, propyl, isopropyl, butyl, sec-butyl, tert-butyl, pentyl, hexyl, octyl, and 2-ethylhexyl. Examples of the alicyclic hydrocarbon group having a substituent include a 3-methyladamantyl group. R 52 is preferably an unsubstituted alicyclic hydrocarbon group having 3 to 18 carbon atoms, and more preferably an adamantyl group, a norbornyl group, or a cyclohexyl group.

[0113] L 55 The divalent saturated hydrocarbon group in the formula (I) includes a divalent saturated chain hydrocarbon group and a divalent saturated alicyclic hydrocarbon group, and is preferably a divalent saturated chain hydrocarbon group. Examples of the divalent chain saturated hydrocarbon group include a methylene group, an ethylene group, and an alkanediyl group such as a propanediyl group, a butanediyl group, and a pentanediyl group. The divalent alicyclic saturated hydrocarbon group may be either monocyclic or polycyclic. Examples of the monocyclic alicyclic saturated hydrocarbon group include cycloalkanediyl groups such as cyclopentanediyl and cyclohexanediyl. Examples of the polycyclic divalent alicyclic saturated hydrocarbon group include adamantanediyl and norbornanediyl.

[0114] L 55 Examples of the divalent saturated hydrocarbon group represented by formula (L1-1) in which one -CH2- is replaced with -O- or -CO- include groups represented by formula (L1-1) to formula (L1-4). In the following formulae, * and ** each represent a bonding site, and * represents a bonding site to an oxygen atom. TIFF0007742222000062.tif18165 formula (L1-1), X x1 represents *-O-CO- or *-CO-O- (* represents L x1 represents the binding site with ). 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, L x1 and L x2 The total number of carbon atoms is 16 or less. In formula (L1-2), L x3 represents a divalent aliphatic saturated hydrocarbon group having 1 to 17 carbon atoms. L x4 represents a single bond or a divalent aliphatic saturated hydrocarbon group having 1 to 16 carbon atoms. However, L x3 and L x4 The total number of carbon atoms 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 represents a single bond or a divalent aliphatic saturated hydrocarbon group having 1 to 14 carbon atoms. However, L x5 , L x6 and L x7 The total number of carbon atoms is 15 or less. In formula (L1-4), L x8 and L x9 represents 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, L x8 , L x9 and W x1 The total number of carbon atoms is 15 or less.

[0115] 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 x3is 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 x6 is 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.

[0116] Examples of the group represented by formula (L1-1) include the divalent groups shown below. TIFF0007742222000063.tif53136

[0117] Examples of the group represented by formula (L1-2) include the divalent groups shown below. TIFF0007742222000064.tif23130

[0118] Examples of the group represented by formula (L1-3) include the divalent groups shown below. TIFF0007742222000065.tif16145

[0119] Examples of the group represented by formula (L1-4) include the divalent groups shown below. TIFF0007742222000066.tif26114

[0120] L 55 is preferably a single bond or a group represented by formula (L1-1).

[0121] The structural unit (a5-1) includes the structural units shown below and R in the structural unit (a5-1) in the structural units shown below. 51 The structural unit in which a methyl group corresponding to the above is replaced with a hydrogen atom is an example. TIFF0007742222000067.tif77158

[0122] When the resin (A) has the structural unit (a5), the content thereof is preferably from 1 to 30 mol %, more preferably from 2 to 20 mol %, and even more preferably from 3 to 15 mol %, based on all structural units in the resin (A).

[0123] <Structural unit (II)> The resin (A) may further contain a structural unit that decomposes upon exposure to generate an acid (hereinafter, sometimes referred to as "structural unit (II)"). Specific examples of the structural unit (II) include the structural units described in JP-A-2016-79235, and the structural unit (II) is preferably a structural unit having a sulfonate group or carboxylate group and an organic cation in a side chain, or a structural unit having a sulfonio group and an organic anion in a side chain.

[0124] The structural unit having a sulfonate group or carboxylate group and an organic cation on the side chain is preferably a structural unit represented by formula (II-2-A'). TIFF0007742222000069.tif3189 [In formula (II-2-A'), X III3represents a divalent saturated hydrocarbon group having 1 to 18 carbon atoms, wherein one -CH2- contained in the saturated hydrocarbon group may be replaced by -O-, -S-, or -CO-, and a hydrogen atom contained in the saturated hydrocarbon group may be replaced by a halogen atom, an alkyl group having 1 to 6 carbon atoms which may have a halogen atom, or a hydroxy group. A x1 represents an alkanediyl group having 1 to 8 carbon atoms, and a hydrogen atom contained in the alkanediyl group may be substituted with a fluorine atom or a perfluoroalkyl group having 1 to 6 carbon atoms. RA - represents a sulfonate group or a carboxylate group. R III3 represents a hydrogen atom, a halogen atom or an alkyl group having 1 to 6 carbon atoms which may have a halogen atom. ZA + represents an organic cation.

[0125] R III3 Examples of the halogen atom represented by the formula (I) include a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom. R III3 The alkyl group having 1 to 6 carbon atoms which may have a halogen atom and is represented by the formula: a8 Examples of the alkyl group include the same alkyl groups having 1 to 6 carbon atoms which may have a halogen atom and which are represented by the following formula: A x1 Examples of the alkanediyl group having 1 to 8 carbon atoms represented by the formula (I) 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, 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. A x1Examples of the perfluoroalkyl group having 1 to 6 carbon atoms which may be substituted 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, and a perfluorohexyl group.

[0126] X III3 Examples of the divalent saturated hydrocarbon group having 1 to 18 carbon atoms represented by the formula (I) include a linear or branched alkanediyl group, and a monocyclic or polycyclic divalent alicyclic saturated hydrocarbon group, and these may be used in combination. Specific examples thereof include linear alkanediyl groups such as methylene, ethylene, propane-1,3-diyl, propane-1,2-diyl, butane-1,4-diyl, pentane-1,5-diyl, hexane-1,6-diyl, heptane-1,7-diyl, octane-1,8-diyl, nonane-1,9-diyl, decane-1,10-diyl, undecane-1,11-diyl, and dodecane-1,12-diyl; butane-1,3-diyl, 2-methylpropane-1,3-diyl, and 2-methylpropane-1,2-diyl; divalent monocyclic alicyclic saturated hydrocarbon groups such as branched alkanediyl groups, such as cyclobutane-1,3-diyl group, cyclopentane-1,3-diyl group, cyclohexane-1,4-diyl group, cyclooctane-1,5-diyl group, and the like; and divalent polycyclic alicyclic saturated hydrocarbon groups, such as norbornane-1,4-diyl group, norbornane-2,5-diyl group, adamantane-1,5-diyl group, and the like.

[0127] Examples of saturated hydrocarbon groups in which -CH2- is replaced with -O-, -S-, or -CO- include divalent groups represented by formulae (X1) to (X53). However, the number of carbon atoms before the -CH2- in the saturated hydrocarbon group is replaced with -O-, -S-, or -CO- is 17 or less. In the following formulae, * and ** represent bonding sites, and * represents A x1represents the binding site with TIFF0007742222000070.tif148164

[0128] 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 6 represents 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.

[0129] ZA + Examples of the organic cation represented by formula (b2-1) 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. Specific examples include cations represented by any of formulas (b2-1) to (b2-4) above.

[0130] The structural unit represented by formula (II-2-A') is preferably a structural unit represented by formula (II-2-A). JPEG0007742222000071.jpg37109 [In formula (II-2-A), R III3 , X III3 and ZA + has the same meaning as above. z represents an integer of 0 to 6; R III2 and R III4 each independently represents a hydrogen atom, a fluorine atom, or a perfluoroalkyl group having 1 to 6 carbon atoms; when z is 2 or more, a plurality of RIII2 and R III4 may be the same or different from each other. Q a and Q b each independently represents a fluorine atom or a perfluoroalkyl group having 1 to 6 carbon atoms.]

[0131] R III2 , R III4 , Q a and Q b As the perfluoroalkyl group having 1 to 6 carbon atoms represented by the formula (I), the following Q b1 Examples include the same perfluoroalkyl groups having 1 to 6 carbon atoms as those represented by the following formula:

[0132] The structural unit represented by formula (II-2-A) is preferably a structural unit represented by formula (II-2-A-1). TIFF0007742222000072.tif5576 [In formula (II-2-A-1), R III2 , R III3 , R III4 , Q a , Q b , z and ZA + has the same meaning as above. R III5 represents a saturated hydrocarbon group having 1 to 12 carbon atoms. X I2 represents a divalent saturated hydrocarbon group having 1 to 11 carbon atoms, wherein -CH2- contained in the saturated hydrocarbon group may be replaced by -O-, -S-, or -CO-, and wherein a hydrogen atom contained in the saturated hydrocarbon group may be substituted by a halogen atom or a hydroxy group.

[0133] R III5 Examples of the saturated hydrocarbon group having 1 to 12 carbon atoms represented by the formula (I) include linear or branched 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, a heptyl group, an octyl group, a nonyl group, a decyl group, an undecyl group, and a dodecyl group. X I2As the divalent saturated hydrocarbon group represented by X III3 Examples of the divalent saturated hydrocarbon group include those similar to those represented by the following formula:

[0134] The structural unit represented by formula (II-2-A-1) is preferably a structural unit represented by formula (II-2-A-2). TIFF0007742222000073.tif5287 [In formula (II-2-A-2), R III3 , R III5 and ZA + has the same meaning as above. m and nA each independently represent 1 or 2.]

[0135] Examples of the structural unit represented by formula (II-2-A') include the following structural units, R III3 Examples of the structural units include those in which the group corresponding to the methyl group in the formula (1) is replaced with a hydrogen atom, a halogen atom (e.g., a fluorine atom), or an alkyl group having 1 to 6 carbon atoms which may have a halogen atom (e.g., a trifluoromethyl group), and the structural units described in WO 2012 / 050015. + represents an organic cation. TIFF0007742222000074.tif86163

[0136] The structural unit having a sulfonio group and an organic anion on the side chain is preferably a structural unit represented by formula (II-1-1). TIFF0007742222000075.tif3380[In formula (II-1-1), A II1 represents a single bond or a divalent linking group. R II1 represents a divalent aromatic hydrocarbon group having 6 to 18 carbon atoms. R II2 and R II3 each independently represents a hydrocarbon group having 1 to 18 carbon atoms; R II2 and R II3 may be bonded to each other to form a ring together with the sulfur atom to which they are attached. RII4 represents a hydrogen atom, a halogen atom or an alkyl group having 1 to 6 carbon atoms which may have a halogen atom. A - represents an organic anion. R II1 Examples of the divalent aromatic hydrocarbon group having 6 to 18 carbon atoms represented by the formula include a phenylene group and a naphthylene group. R II2 and R II3 Examples of the hydrocarbon group represented by the formula (I) include an alkyl group, an alicyclic hydrocarbon group, an aromatic hydrocarbon group, and a group formed by combining these groups. Examples of the alkyl group and the alicyclic hydrocarbon group include the same as those described above. 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 in which the above-mentioned alkyl group and alicyclic hydrocarbon group are combined, aralkyl groups such as a benzyl group, aromatic hydrocarbon groups having an alkyl group (e.g., p-methylphenyl group, p-tert-butylphenyl group, tolyl group, xylyl group, cumenyl group, mesityl group, 2,6-diethylphenyl group, 2-methyl-6-ethylphenyl group), aromatic hydrocarbon groups having an alicyclic hydrocarbon group (e.g., p-cyclohexylphenyl group, p-adamantylphenyl group), and aryl-cycloalkyl groups such as a phenylcyclohexyl group. R II4 Examples of the halogen atom represented by the formula (I) include a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom. R II4 The alkyl group having 1 to 6 carbon atoms which may have a halogen atom and is represented by the formula: a8 Examples of the alkyl group include the same alkyl groups having 1 to 6 carbon atoms which may have a halogen atom and which are represented by the following formula: A II1 Examples of the divalent linking group represented by the formula (I) 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-. III3Examples include the same divalent saturated hydrocarbon groups having 1 to 18 carbon atoms as those represented by the following formula:

[0137] The structural unit containing a cation in formula (II-1-1) includes the structural unit represented by the following formula: R II4 Examples of structural units include those in which a group corresponding to the methyl group in the above formula (I) is replaced with 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). TIFF0007742222000076.tif84130

[0138] A - Examples of the organic anion represented by the formula (A) include a sulfonate anion, a sulfonylimide anion, a sulfonylmethide anion, and a carboxylate anion. - The organic anion represented by the formula (B1) is preferably a sulfonate anion, and examples of the sulfonate anion include the same anions as those represented by the formula (B1) described below.

[0139] A - Examples of the sulfonylimide anion represented by the formula (I) include the following. TIFF0007742222000077.tif36135

[0140] Examples of sulfonylmethide anions include the following: TIFF0007742222000078.tif29123

[0141] Examples of carboxylate anions include the following: TIFF0007742222000079.tif40140

[0142] Examples of the structural unit represented by formula (II-1-1) include structural units represented by the following formulas. TIFF0007742222000080.tif88149

[0143] When the structural unit (II) is contained in the resin (A), the content of the structural unit (II) is preferably 1 to 20 mol %, more preferably 2 to 15 mol %, and even more preferably 3 to 10 mol %, based on the total structural units of the resin (A).

[0144] The resin (A) may have structural units other than the above-mentioned structural units, and examples of such structural units include structural units well known in the art.

[0145] The resin (A) may have structural units other than the above-mentioned structural units, and examples of such structural units include structural units well known in the art.

[0146] The resin (A) is preferably a resin composed of the structural unit (I) and the structural unit (a2-A), a resin composed of the structural unit (I), the structural unit (a2-A), the structural unit (a1-1), and the structural unit (a1-2), a resin composed of the structural unit (I), the structural unit (a2-A), and the structural unit (a1-1), a resin composed of the structural unit (I), the structural unit (a2-A), and the structural unit (a1-2), a resin composed of the structural unit (I), the structural unit (a2-A), the structural unit (a1-1), the structural unit (a1-2), and the structural unit (s), a resin composed of the structural unit ( a resin comprising the structural unit (I), the structural unit (a2-A), the structural unit (a1-1), the structural unit (a1-2), the structural unit (a1-0), and the structural unit (s); a resin comprising the structural unit (I), the structural unit (a2-A), the structural unit (a1-1), and the structural unit (s); a resin comprising the structural unit (I), the structural unit (a2-A), the structural unit (a1-2), and the structural unit (s); a resin comprising the structural unit (I), the structural unit (a2-A), the structural unit (a1-1), the structural unit (a1-2), the structural unit (s), and the structural unit (a4) and / or the structural unit (a5) or a resin consisting only of the structural unit (I), the structural unit (a2-A), the structural unit (a1-1), the structural unit (a1-2), and the structural unit (a4), and more preferably a resin consisting of the structural unit (I) and the structural unit (a2-A), a resin consisting of the structural unit (I), the structural unit (a2-A), the structural unit (a1-1), and the structural unit (a1-2), a resin consisting of the structural unit (I), the structural unit (a2-A), and the structural unit (a1-1), a resin consisting of the structural unit (I), the structural unit (a2-A), and the structural unit (a1-2), a resin consisting of the structural unit (I), the structural unit (a2-A), the structural unit (a1-1), the structural unit (a1-2), and the structural unit (s); a resin consisting of the structural unit (I), the structural unit (a2-A), the structural unit (a1-1), the structural unit (a1-2), the structural unit (a1-0), and the structural unit (s); a resin consisting of the structural unit (I), the structural unit (a2-A), the structural unit (a1-1), and the structural unit (s); and a resin consisting of the structural unit (I), the structural unit (a2-A), the structural unit (a1-2), and the structural unit (s).

[0147] 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), and the structural unit (a1-2), and more preferably at least one 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 (a2-1). The structural unit (a3) ​​is preferably at least one selected from the group consisting of the structural unit represented by formula (a3-1), the structural unit represented by formula (a3-2), and the structural unit represented by formula (a3-4).

[0148] The structural units constituting the resin (A) may be used singly or in combination of two or more, and can be produced by a known polymerization method (e.g., radical polymerization) using monomers that lead to these structural units. The content of each structural unit in the resin (A) can be adjusted by the amount of monomer used in the polymerization. The weight average molecular weight of the resin (A) is preferably 2,000 or more (more preferably 2,500 or more, even more preferably 3,000 or more) and 50,000 or less (more preferably 30,000 or less, even more preferably 15,000 or less). In this specification, the weight average molecular weight is a value determined by gel permeation chromatography, which can be measured under the analytical conditions described in the Examples.

[0149] [Compound represented by formula (IA)] The present invention relates to a compound represented by formula (IA) (hereinafter sometimes referred to as "compound (IA)"). Compound (IA) is a monomer from which structural units (I), such as those represented by formulae (I-25) to (I-30) and (I-32), are derived. TIFF0007742222000081.tif5964[In formula (IA), R 1represents an alkyl group having 1 to 6 carbon atoms which may have one or more halogen atoms, a hydrogen atom, or a halogen atom. X A1 is the formula (X 1 -2)~Formula(X 1 -7). TIFF0007742222000082.tif46125(formula(X 1 -2)~Formula(X 1 -7) Medium, * and ** are the bonding sites, * represents the bonding site with the carbon atom to which R1 is bonded, and ** represents A 1 ) A 1 is a single bond or * -A 2 -CO-O-. * represents X A1 represents the binding site with A 2 represents an alkanediyl group having 1 to 6 carbon atoms. R 2 and R 3 each independently represents a saturated hydrocarbon group having 1 to 6 carbon atoms. X a and X b each independently represents -O- or -S-. X 11 represents a divalent saturated hydrocarbon group having 1 to 12 carbon atoms which may contain a fluorine atom. L 1 represents a single bond or a hydrocarbon group having 1 to 28 carbon atoms which may have a substituent, and -CH2- contained in the hydrocarbon group may be replaced by -O-, -S-, -SO2- or -CO-. R 4 represents a hydrocarbon group having 1 to 36 carbon atoms which may have a substituent, and -CH2- contained in the hydrocarbon group may be replaced by -O-, -S-, -CO- or -SO2-.]

[0150] R 1 , R 2 , R 3 , R 4 , A 1 , A 2 , X a , Xb , X 11 and L 1 is R in formula (I) 1 , R 2 , R 3 , R 4 , A 1 , A 2 , X a , X b , X 11 and L 1 and examples thereof include the same groups as those exemplified above.

[0151] Examples of compound (IA) include the compounds shown below. TIFF0007742222000083.tif60135

[0152] TIFF0007742222000084.tif132166

[0153] In the compound represented by the above formula, R 1 A specific example of compound (IA) is a compound in which the methyl group corresponding to the following formula is replaced with a hydrogen atom:

[0154] <Method for producing compound (IA)> Compound (IA) can be obtained by reacting a compound represented by formula (Ia) with a compound represented by formula (Ib) in the presence of a catalyst in a solvent. TIFF0007742222000085.tif67141 [wherein all symbols have the same meanings as above] Examples of the solvent include methyl isobutyl ketone, chloroform, tetrahydrofuran, and toluene. Examples of the catalyst include pyridine, dimethylaminopyridine, N-methylpiperidine, N-methylpyrrolidine, potassium hydroxide, and the like, and carbonyldiimidazole. Examples of the compound represented by formula (Ia) include salts represented by the following formula, which are readily available on the market. TIFF0007742222000086.tif3785 Examples of the compound represented by formula (Ib) include salts represented by the following formula, which are readily available on the market and can be easily produced by known methods. TIFF0007742222000087.tif40119

[0155] [Resist Composition] The resist composition of the present invention preferably contains a resin (A) and an acid generator known in the resist field (hereinafter sometimes referred to as "acid generator (B)"). The resist composition of the present invention may further contain a resin other than the resin (A). The resist composition of the present invention preferably contains a quencher such as a salt that generates an acid that is weaker in acidity than the acid generated from the acid generator (hereinafter may be referred to as "quencher (C)"), and preferably contains a solvent (hereinafter may be referred to as "solvent (E)").

[0156] <Resins other than Resin (A)> The resist composition of the present invention may contain a resin other than resin (A). The resin other than resin (A) may be any resin that does not contain structural unit (I) or structural unit (a2-A). Examples of such resins include a resin obtained by removing structural unit (I) from resin (A) (hereinafter sometimes referred to as "resin (AY)"), a resin obtained by removing structural unit (a2-A) from resin (A) (hereinafter sometimes referred to as "resin (AZ)"), and a resin consisting only of structural unit (a4) and structural unit (a5) (hereinafter sometimes referred to as "resin (X)").

[0157] As the resin (X), a resin containing the structural unit (a4) is particularly preferred. In the resin (X), the content of the structural unit (a4) is preferably 30 mol % or more, more preferably 40 mol % or more, and even more preferably 45 mol % or more, based on the total of all structural units in the resin (X). Examples of structural units that the resin (X) may further have include the structural unit (a2), the structural unit (a3), and structural units derived from other known monomers. Of these, the resin (X) is preferably a resin consisting only of the structural unit (a4) and / or the structural unit (a5). The structural units constituting the resin (X) may be used singly or in combination of two or more, and can be produced by a known polymerization method (e.g., radical polymerization) using monomers that derive these structural units. The content of each structural unit in the resin (X) can be adjusted by the amount of monomer used in the polymerization.

[0158] The weight average molecular weights of resins (AY), (AZ), and (X) are each independently preferably 6,000 or more (more preferably 7,000 or more) and 80,000 or less (more preferably 60,000 or less). The weight average molecular weights of resins (AY), (AZ), and (X) are measured by the same method as for resin (A). When the resist composition of the present invention contains resin (AY) and / or resin (AZ), the total content thereof is generally 1 to 2500 parts by mass (more preferably 10 to 1000 parts by mass) per 100 parts by mass of resin (A). Furthermore, when the resist composition contains resin (X), the content thereof is preferably 1 to 60 parts by mass, more preferably 1 to 50 parts by mass, even 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, relative to 100 parts by mass of resin (A).

[0159] In the resist composition of the present invention, resin (A) may be used in combination with a resin other than resin (A). When using a resin other than resin (A) in combination, it is preferable to use a resin containing a structural unit having an acid labile group and / or a resin containing a structural unit having a fluorine atom in combination, and it is more preferable to use resin (AY), resin (AZ) and / or resin (X) in combination. The content of resin (A) in the resist composition is preferably 80 to 99 mass% based on the solid content of the resist composition, and more preferably 90 to 99 mass%. Furthermore, when a resin other than resin (A) is contained, the total content of resin (A) and the resin other than resin (A) based on the solid content of the resist composition is preferably 80 to 99 mass% based on the solid content of the resist composition, and more preferably 90 to 99 mass%. The solid content of the resist composition and the resin content relative to the solid content can be measured using known analytical methods such as liquid chromatography or gas chromatography.

[0160] <Acid generator (B)> The acid generator (B) may be either nonionic or ionic. Nonionic acid generators include sulfonate esters (e.g., 2-nitrobenzyl ester, aromatic sulfonate, oxime sulfonate, N-sulfonyloxyimide, sulfonyloxyketone, diazonaphthoquinone 4-sulfonate), sulfones (e.g., disulfone, ketosulfone, sulfonyldiazomethane), etc. Ionic acid generators include onium salts containing onium cations (e.g., diazonium salts, phosphonium salts, sulfonium salts, iodonium salts). Anions of onium salts include sulfonate anions, sulfonylimide anions, sulfonylmethide anions, etc. The acid generator (B) may be a compound that generates an acid when exposed to radiation, 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. Pat. No. 3,779,778, U.S. Pat. No. 3,849,137, German Patent No. 3,914,407, or European Patent No. 126,712. Compounds produced by known methods may also be used. Two or more types of acid generator (B) may be used in combination.

[0161] The acid generator (B) is preferably a fluorine-containing acid generator, and more preferably a salt represented by formula (B1) (hereinafter sometimes referred to as "acid generator (B1)"). TIFF0007742222000088.tif2957[In formula (B1), Q b1 and Q b2 each independently represents a fluorine atom or a perfluoroalkyl group having 1 to 6 carbon atoms. L b1 represents a divalent saturated hydrocarbon group having 1 to 24 carbon atoms, wherein -CH2- contained in the divalent saturated hydrocarbon group may be replaced by -O- or -CO-, and wherein a hydrogen atom contained in the divalent saturated hydrocarbon group may be substituted by a fluorine atom or a hydroxy group. Y represents an optionally substituted methyl group or an optionally substituted alicyclic hydrocarbon group having 3 to 24 carbon atoms, and -CH2- contained in the alicyclic hydrocarbon group may be replaced by -O-, -S(O)2- or -CO-. Z + represents an organic cation.

[0162] Q b1 and Q b2 Examples of the perfluoroalkyl group represented by the formula (I) 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, and a perfluorohexyl group. Q b1 and Q b2 and are each independently preferably a fluorine atom or a trifluoromethyl group, and more preferably both are fluorine atoms.

[0163] L b1 Examples of the divalent saturated hydrocarbon group in include a linear alkanediyl group, a branched alkanediyl group, and a monocyclic or polycyclic divalent alicyclic saturated hydrocarbon group, and may also be a group formed by combining two or more of these groups. Specific examples 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; branched alkanediyl groups such as ethane-1,1-diyl, propane-1,1-diyl, propane-1,2-diyl, propane-2,2-diyl, pentane-2,4-diyl, 2-methylpropane-1,3-diyl, 2-methylpropane-1,2-diyl, pentane-1,4-diyl, and 2-methylbutane-1,4-diyl; monocyclic divalent alicyclic saturated hydrocarbon groups such as cycloalkanediyl groups, such as cyclobutane-1,3-diyl, cyclopentane-1,3-diyl, cyclohexane-1,4-diyl, and cyclooctane-1,5-diyl; Examples include polycyclic divalent alicyclic saturated hydrocarbon groups such as norbornane-1,4-diyl group, norbornane-2,5-diyl group, adamantane-1,5-diyl group, and adamantane-2,6-diyl group. L b1 Examples of the divalent saturated hydrocarbon group represented by the formula (b1-1) in which one -CH2- is replaced with -O- or -CO- include groups represented by any of formulas (b1-1) to (b1-3). In the groups represented by formulas (b1-1) to (b1-3) and specific examples thereof, groups represented by formulas (b1-4) to (b1-11), * and ** represent bonding sites, and * represents the bonding site to -Y.

[0164] TIFF0007742222000089.tif26117 [In formula (b1-1), L b2represents a single bond or a divalent saturated hydrocarbon group having 1 to 22 carbon atoms, and a hydrogen atom contained in the saturated hydrocarbon group may be substituted with a fluorine atom. L b3 represents a single bond or a divalent saturated hydrocarbon group having 1 to 22 carbon atoms, and a hydrogen atom contained in the saturated hydrocarbon group may be substituted with a fluorine atom or a hydroxy group, and -CH2- contained in the saturated hydrocarbon group may be substituted with -O- or -CO-. However, L b2 and L b3 The total number of carbon atoms is 22 or less. In formula (b1-2), L b4 represents a single bond or a divalent saturated hydrocarbon group having 1 to 22 carbon atoms, and a hydrogen atom contained in the saturated hydrocarbon group may be substituted with a fluorine atom. L b5 represents a single bond or a divalent saturated hydrocarbon group having 1 to 22 carbon atoms, and a hydrogen atom contained in the saturated hydrocarbon group may be substituted with a fluorine atom or a hydroxy group, and -CH2- contained in the saturated hydrocarbon group may be substituted with -O- or -CO-. However, L b4 and L b5 The total number of carbon atoms is 22 or less. In formula (b1-3), L b6 represents a single bond or a divalent saturated hydrocarbon group having 1 to 23 carbon atoms, and a hydrogen atom contained in the saturated hydrocarbon group may be substituted with a fluorine atom or a hydroxy group. L b7 represents a single bond or a divalent saturated hydrocarbon group having 1 to 23 carbon atoms, and a hydrogen atom contained in the saturated hydrocarbon group may be substituted with a fluorine atom or a hydroxy group, and -CH2- contained in the saturated hydrocarbon group may be substituted with -O- or -CO-. However, L b6 and L b7 The total number of carbon atoms is 23 or less.

[0165] In the groups represented by formulae (b1-1) to (b1-3), when -CH2- contained in the saturated hydrocarbon group is replaced with -O- or -CO-, the number of carbon atoms before replacement is defined as the number of carbon atoms of the saturated hydrocarbon group. As the divalent saturated hydrocarbon group, L b1 Examples of the divalent saturated hydrocarbon group include the same as the divalent saturated hydrocarbon group. L b2 is preferably a single bond. L b3 is preferably a divalent saturated hydrocarbon group having 1 to 4 carbon atoms. L b4 is preferably a divalent saturated hydrocarbon group having 1 to 8 carbon atoms, and a hydrogen atom contained in the divalent saturated hydrocarbon group may be substituted with a fluorine atom. L b5 is preferably a single bond or a divalent saturated hydrocarbon group having 1 to 8 carbon atoms. L b6 is preferably a single bond or a divalent saturated hydrocarbon group having 1 to 4 carbon atoms, and a hydrogen atom contained in the saturated hydrocarbon group may be substituted with a fluorine atom. L b7 is preferably a single bond or a divalent saturated hydrocarbon group having 1 to 18 carbon atoms, and a hydrogen atom contained in the saturated hydrocarbon group may be substituted with a fluorine atom or a hydroxy group, and -CH2- contained in the divalent saturated hydrocarbon group may be substituted with -O- or -CO-. L b1 As the divalent saturated hydrocarbon group represented by the formula (b1-1) or (b1-3), in which one --CH.sub.2-- contained in the group is replaced by --O-- or --CO--, a group represented by the formula (b1-1) or (b1-3) is preferred.

[0166] Examples of the group represented by formula (b1-1) include groups represented by formulas (b1-4) to (b1-8). TIFF0007742222000090.tif49120[In formula (b1-4), L b8 represents a single bond or a divalent saturated hydrocarbon group having 1 to 22 carbon atoms, and a hydrogen atom contained in the saturated hydrocarbon group may be substituted with a fluorine atom or a hydroxy group. In formula (b1-5), L b9 represents a divalent saturated hydrocarbon group having 1 to 20 carbon atoms, and -CH2- contained in the divalent saturated hydrocarbon group may be replaced with -O- or -CO-. L b10 represents a single bond or a divalent saturated hydrocarbon group having 1 to 19 carbon atoms, and a hydrogen atom contained in the divalent saturated hydrocarbon group may be substituted with a fluorine atom or a hydroxy group. However, L b9 and L b10 The total number of carbon atoms is 20 or less. In formula (b1-6), L b11 represents a divalent saturated hydrocarbon group having 1 to 21 carbon atoms. L b12 represents a single bond or a divalent saturated hydrocarbon group having 1 to 20 carbon atoms, and a hydrogen atom contained in the divalent saturated hydrocarbon group may be substituted with a fluorine atom or a hydroxy group. However, L b11 and L b12 The total number of carbon atoms is 21 or less. In formula (b1-7), L b13 represents a divalent saturated hydrocarbon group having 1 to 19 carbon atoms. L b14 represents a single bond or a divalent saturated hydrocarbon group having 1 to 18 carbon atoms, and -CH2- contained in the divalent saturated hydrocarbon group may be replaced with -O- or -CO-. L b15 represents a single bond or a divalent saturated hydrocarbon group having 1 to 18 carbon atoms, and a hydrogen atom contained in the divalent saturated hydrocarbon group may be substituted with a fluorine atom or a hydroxy group. However, L b13 ~L b15 The total number of carbon atoms is 19 or less. In formula (b1-8), L b16 represents a divalent saturated hydrocarbon group having 1 to 18 carbon atoms, and -CH2- contained in the divalent saturated hydrocarbon group may be replaced with -O- or -CO-. L b17represents a divalent saturated hydrocarbon group having 1 to 18 carbon atoms. L b18 represents a single bond or a divalent saturated hydrocarbon group having 1 to 17 carbon atoms, and a hydrogen atom contained in the divalent saturated hydrocarbon group may be substituted with a fluorine atom or a hydroxy group. However, L b16 ~L b18 The total number of carbon atoms is 19 or less. L b8 is preferably a divalent saturated hydrocarbon group having 1 to 4 carbon atoms. L b9 is preferably a divalent saturated hydrocarbon group having 1 to 8 carbon atoms. L b10 is preferably a single bond or a divalent saturated hydrocarbon group having 1 to 19 carbon atoms, and more preferably a single bond or a divalent saturated hydrocarbon group having 1 to 8 carbon atoms. L b11 is preferably a divalent saturated hydrocarbon group having 1 to 8 carbon atoms. L b12 is preferably a single bond or a divalent saturated hydrocarbon group having 1 to 8 carbon atoms. L b13 is preferably a divalent saturated hydrocarbon group having 1 to 12 carbon atoms. L b14 is preferably a single bond or a divalent saturated hydrocarbon group having 1 to 6 carbon atoms. L b15 is preferably a single bond or a divalent saturated hydrocarbon group having 1 to 18 carbon atoms, and more preferably a single bond or a divalent saturated hydrocarbon group having 1 to 8 carbon atoms. L b16 is preferably a divalent saturated hydrocarbon group having 1 to 12 carbon atoms. L b17 is preferably a divalent saturated hydrocarbon group having 1 to 6 carbon atoms. L b18 is preferably a single bond or a divalent saturated hydrocarbon group having 1 to 17 carbon atoms, and more preferably a single bond or a divalent saturated hydrocarbon group having 1 to 4 carbon atoms.

[0167] Examples of the group represented by formula (b1-3) include groups represented by formulas (b1-9) to (b1-11). TIFF0007742222000091.tif23140 formula (b1-9), L b19 represents a single bond or a divalent saturated hydrocarbon group having 1 to 23 carbon atoms, and a hydrogen atom contained in the saturated hydrocarbon group may be substituted with a fluorine atom. L b20 represents a single bond or a divalent saturated hydrocarbon group having 1 to 23 carbon atoms, and a hydrogen atom contained in the saturated hydrocarbon group may be substituted with a fluorine atom, a hydroxy group, or an alkylcarbonyloxy group. -CH2- contained in the alkylcarbonyloxy group may be replaced with -O- or -CO-, and a hydrogen atom contained in the alkylcarbonyloxy group may be substituted with a hydroxy group. However, L b19 and L b20 The total number of carbon atoms is 23 or less. In formula (b1-10), L b21 represents a single bond or a divalent saturated hydrocarbon group having 1 to 21 carbon atoms, and a hydrogen atom contained in the saturated hydrocarbon group may be substituted with a fluorine atom. L b22 represents a single bond or a divalent saturated hydrocarbon group having 1 to 21 carbon atoms. L b23 represents a single bond or a divalent saturated hydrocarbon group having 1 to 21 carbon atoms, and a hydrogen atom contained in the saturated hydrocarbon group may be substituted with a fluorine atom, a hydroxy group, or an alkylcarbonyloxy group. -CH2- contained in the alkylcarbonyloxy group may be replaced with -O- or -CO-, and a hydrogen atom contained in the alkylcarbonyloxy group may be substituted with a hydroxy group. However, L b21 , L b22 and L b23 The total number of carbon atoms is 21 or less. In formula (b1-11), L b24represents a single bond or a divalent saturated hydrocarbon group having 1 to 20 carbon atoms, and a hydrogen atom contained in the saturated hydrocarbon group may be substituted with a fluorine atom. L b25 represents a divalent saturated hydrocarbon group having 1 to 21 carbon atoms. L b26 represents a single bond or a divalent saturated hydrocarbon group having 1 to 20 carbon atoms, and a hydrogen atom contained in the saturated hydrocarbon group may be substituted with a fluorine atom, a hydroxy group, or an alkylcarbonyloxy group. -CH2- contained in the alkylcarbonyloxy group may be replaced with -O- or -CO-, and a hydrogen atom contained in the alkylcarbonyloxy group may be substituted with a hydroxy group. However, L b24 , L b25 and L b26 The total number of carbon atoms is 21 or less. In addition, in the groups represented by formulae (b1-9) to (b1-11), when a hydrogen atom contained in the saturated hydrocarbon group is substituted with an alkylcarbonyloxy group, the number of carbon atoms before substitution is regarded as the number of carbon atoms of the saturated hydrocarbon group. Examples of the alkylcarbonyloxy group include an acetyloxy group, a propionyloxy group, a butyryloxy group, a cyclohexylcarbonyloxy group, and an adamantylcarbonyloxy group.

[0168] Examples of the group represented by formula (b1-4) include the following. TIFF0007742222000092.tif17150 (* and ** represent binding sites, * represents the binding site with Y.)

[0169] Examples of the group represented by formula (b1-5) include the following. TIFF0007742222000093.tif72148 (* and ** represent binding sites, * represents the binding site with Y.)

[0170] Examples of the group represented by formula (b1-6) include the following. TIFF0007742222000094.tif29150 (* and ** represent binding sites, * represents the binding site with Y.)

[0171] Examples of the group represented by formula (b1-7) include the following. TIFF0007742222000095.tif64150 (* and ** represent binding sites, * represents the binding site with Y.)

[0172] Examples of the group represented by formula (b1-8) include the following. TIFF0007742222000096.tif23150 (* and ** represent bonds, * represents a bond to Y.)

[0173] Examples of the group represented by formula (b1-2) include the following. TIFF0007742222000097.tif31161 (* and ** represent bonds, * represents a bond to Y.)

[0174] Examples of the group represented by formula (b1-9) include the following. TIFF0007742222000098.tif44137 (* and ** represent bonds, * represents a bond to Y.)

[0175] Examples of the group represented by formula (b1-10) include the following. TIFF0007742222000099.tif89157 (* and ** represent bonds, * represents a bond to Y.)

[0176] Examples of the group represented by formula (b1-11) include the following. TIFF0007742222000100.tif82158 (* and ** represent bonds, * represents a bond to Y.)

[0177] Examples of the alicyclic hydrocarbon group represented by Y include groups represented by formulae (Y1) to (Y11) and (Y36) to (Y38). When one -CH2- in the alicyclic hydrocarbon group represented by Y is replaced with -O-, -S(O)2-, or -CO-, the number may be 1 or 2 or more. Examples of such groups include groups represented by formulae (Y12) to (Y35) and formulae (Y39) to (Y43). The alicyclic hydrocarbon group represented by TIFF0007742222000101.tif84169Y is preferably a group represented by any one of formulas (Y1) to (Y20), (Y26), (Y27), (Y30), (Y31), and (Y39) to (Y43), and more preferably a group represented by formula (Y11), (Y15), (Y16), (Y20), or (Y43). Preferred are groups represented by formula (Y11), formula (Y15), formula (Y20), formula (Y26), formula (Y27), formula (Y30), formula (Y31), formula (Y39), formula (Y40), formula (Y42), or formula (Y43), and more preferred are groups represented by formula (Y11), formula (Y15), formula (Y20), formula (Y26), formula (Y27), formula (Y30), formula (Y31), formula (Y39), formula (Y40), formula (Y42), or formula (Y43). When the alicyclic hydrocarbon group represented by Y is a spiro ring having an oxygen atom such as those of formulae (Y28) to (Y35), (Y39) to (Y40), (Y42) or (Y43), the alkanediyl group between the two oxygen atoms preferably has one or more fluorine atoms. Furthermore, among the alkanediyl groups contained in the ketal structure, it is preferred that the methylene group adjacent to the oxygen atom is not substituted with a fluorine atom.

[0178] The substituent of the methyl group represented by Y is a halogen atom, a hydroxy group, an alicyclic hydrocarbon group having 3 to 16 carbon atoms, an aromatic hydrocarbon group having 6 to 18 carbon atoms, a glycidyloxy group, -(CH2) ja -CO-OR b1 group or -(CH2) ja -O-CO-R b1 group (in the formula, R b1represents an alkyl group having 1 to 16 carbon atoms, an alicyclic hydrocarbon group having 3 to 16 carbon atoms, an aromatic hydrocarbon group having 6 to 18 carbon atoms, or a group combining these, wherein -CH2- contained in the alkyl group and the alicyclic hydrocarbon group may be replaced by -O-, -SO2-, or -CO-, and a hydrogen atom contained in the alkyl group, the alicyclic hydrocarbon group, or the aromatic hydrocarbon group may be replaced by a hydroxy group or a fluorine atom. ja represents an integer of 0 to 4. Substituents of the alicyclic hydrocarbon group represented by Y include a halogen atom, a hydroxy group, an alkyl group having 1 to 16 carbon atoms which may be substituted with a hydroxy group (-CH2- contained in the alkyl group may be replaced with -O- or -CO-), an alicyclic hydrocarbon group having 3 to 16 carbon atoms, an aromatic hydrocarbon group having 6 to 18 carbon atoms, an aralkyl group having 7 to 21 carbon atoms, a glycidyloxy group, -(CH2) ja -CO-OR b1 group or -(CH2) ja -O-CO-R b1 group (in the formula, R b1 represents an alkyl group having 1 to 16 carbon atoms, an alicyclic hydrocarbon group having 3 to 16 carbon atoms, an aromatic hydrocarbon group having 6 to 18 carbon atoms, or a group combining these, wherein -CH2- contained in the alkyl group and the alicyclic hydrocarbon group may be replaced by -O-, -SO2-, or -CO-, and a hydrogen atom contained in the alkyl group, the alicyclic hydrocarbon group, or the aromatic hydrocarbon group may be replaced by a hydroxy group or a fluorine atom. ja represents an integer of 0 to 4.

[0179] Examples of the halogen atom include a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom. Examples of the alicyclic hydrocarbon group include a cyclopentyl group, a cyclohexyl group, a methylcyclohexyl group, a dimethylcyclohexyl group, a cycloheptyl group, a cyclooctyl group, a norbornyl group, and an adamantyl group. The alicyclic hydrocarbon group may have a chain hydrocarbon group, such as a methylcyclohexyl group or a dimethylcyclohexyl group. The number of carbon atoms in the alicyclic hydrocarbon group is preferably 3 to 12, and more preferably 3 to 10. Examples of aromatic hydrocarbon groups include aryl groups such as phenyl, naphthyl, anthryl, biphenyl, and phenanthryl. The aromatic hydrocarbon group may have a chain hydrocarbon group or an alicyclic hydrocarbon group, and examples include aromatic hydrocarbon groups having a chain hydrocarbon group with 1 to 18 carbon atoms (such as tolyl, xylyl, cumenyl, mesityl, p-methylphenyl, p-ethylphenyl, p-tert-butylphenyl, 2,6-diethylphenyl, and 2-methyl-6-ethylphenyl), and aromatic hydrocarbon groups having an alicyclic hydrocarbon group with 3 to 18 carbon atoms (such as p-adamantylphenyl and p-cyclohexylphenyl). The aromatic hydrocarbon group preferably has 6 to 14 carbon atoms, and more preferably 6 to 10 carbon atoms. 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, 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 in the alkyl group is preferably 1 to 12, more preferably 1 to 6, and even more preferably 1 to 4. Examples of the alkyl group substituted with a hydroxy group include hydroxyalkyl groups such as a hydroxymethyl group and a hydroxyethyl 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 alkyl group in which -CH2- is replaced by -O-, -S(O)2-, -CO-, or the like include an alkoxy group, an alkoxycarbonyl group, an alkylcarbonyl group, an alkylcarbonyloxy group, or a combination thereof. 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. The number of carbon atoms in the alkoxy group is preferably 1 to 12, more preferably 1 to 6, and even more preferably 1 to 4. Examples of the alkoxycarbonyl group include a methoxycarbonyl group, an ethoxycarbonyl group, a butoxycarbonyl group, etc. The alkoxycarbonyl group preferably has 2 to 12 carbon atoms, more preferably 2 to 6 carbon atoms, and even more preferably 2 to 4 carbon atoms. Examples of the alkylcarbonyl group include an acetyl group, a propionyl group, and a butyryl group. The alkylcarbonyl group preferably has 2 to 12 carbon atoms, more preferably 2 to 6 carbon atoms, and even more preferably 2 to 4 carbon atoms. Examples of the alkylcarbonyloxy group include an acetyloxy group, a propionyloxy group, a butyryloxy group, etc. The alkylcarbonyloxy group preferably has 2 to 12 carbon atoms, more preferably 2 to 6 carbon atoms, and even more preferably 2 to 4 carbon atoms. Examples of the combined group include a group combining an alkoxy group and an alkyl group, a group combining an alkoxy group and an alkoxy group, a group combining an alkoxy group and an alkylcarbonyl group, and a group combining an alkoxy group and an alkylcarbonyloxy group. Examples of the group combining an alkoxy group and an alkyl group include alkoxyalkyl groups such as a methoxymethyl group, a methoxyethyl group, an ethoxyethyl group, an ethoxymethyl group, etc. The number of carbon atoms in the alkoxyalkyl group is preferably 2 to 12, more preferably 2 to 6, and even more preferably 2 to 4. Examples of a group formed by combining an alkoxy group with another alkoxy group include alkoxyalkoxy groups such as a methoxymethoxy group, a methoxyethoxy group, an ethoxymethoxy group, an ethoxyethoxy group, etc. The number of carbon atoms in the alkoxyalkoxy group is preferably 2 to 12, more preferably 2 to 6, and even more preferably 2 to 4. Examples of the group combining an alkoxy group and an alkylcarbonyl group include alkoxyalkylcarbonyl groups such as a methoxyacetyl group, a methoxypropionyl group, an ethoxyacetyl group, an ethoxypropionyl group, etc. The number of carbon atoms in the alkoxyalkylcarbonyl group is preferably 3 to 13, more preferably 3 to 7, and even more preferably 3 to 5. Examples of the group combining an alkoxy group and an alkylcarbonyloxy group include alkoxyalkylcarbonyloxy groups such as a methoxyacetyloxy group, a methoxypropionyloxy group, an ethoxyacetyloxy group, an ethoxypropionyloxy group, etc. The number of carbon atoms in the alkoxyalkylcarbonyloxy group is preferably 3 to 13, more preferably 3 to 7, and even more preferably 3 to 5. Examples of the group in which -CH2- contained in the alicyclic hydrocarbon group is replaced by -O-, -S(O)2-, -CO- or the like include groups represented by formulae (Y12) to (Y35) and formulae (Y39) to (Y43).

[0180] Examples of Y include the following: TIFF0007742222000102.tif160165

[0181] Y is preferably an alicyclic hydrocarbon group of 3 to 24 carbon atoms which may have a substituent, more preferably an alicyclic hydrocarbon group of 3 to 20 carbon atoms which may have a substituent, even more preferably an alicyclic hydrocarbon group of 3 to 18 carbon atoms which may have a substituent, and even more preferably an adamantyl group which may have a substituent, wherein -CH2- constituting the alicyclic hydrocarbon group or the adamantyl group may be replaced by -CO-, -S(O)2- or -CO-. Specifically, Y is preferably an adamantyl group, a hydroxyadamantyl group, an oxoadamantyl group or a group represented by formula (Y42) or formula (Y100) to formula (Y114).

[0182] The anion in the salt represented by formula (B1) is preferably an anion represented by formula (B1-A-1) to formula (B1-A-59) (hereinafter, sometimes referred to as "anion (B1-A-1)" depending on the formula number).), and more preferably an anion represented by any of formula (B1-A-1) to formula (B1-A-4), formula (B1-A-9), formula (B1-A-10), formula (B1-A-24) to formula (B1-A-33), formula (B1-A-36) to formula (B1-A-40), and formula (B1-A-47) to formula (B1-A-59).

[0183] TIFF0007742222000103.tif143153

[0184] TIFF0007742222000104.tif75127

[0185] TIFF0007742222000105.tif130157

[0186] TIFF0007742222000106.tif66155

[0187] TIFF0007742222000107.tif110142

[0188] TIFF0007742222000108.tif85170

[0189] TIFF0007742222000109.tif100158

[0190] where R i2 ~R i7 are each independently, for example, an alkyl group having 1 to 4 carbon atoms, preferably a methyl group or an ethyl group. i8 is, for example, a chain 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. A41 is a single bond or an alkanediyl group having 1 to 4 carbon atoms. b1 and Q b2 has the same meaning as above. Specific examples of the anion in the salt represented by formula (B1) include the anions described in JP-A-2010-204646.

[0191] Preferable anions in the salt represented by formula (B1) include anions represented by formulas (B1a-1) to (B1a-38).

[0192] TIFF0007742222000110.tif125153 TIFF0007742222000111.tif92138

[0193] TIFF0007742222000112.tif167155

[0194] Among these, anions represented by any one of formulas (B1a-1) to (B1a-3), (B1a-7) to (B1a-16), (B1a-18), (B1a-19), and (B1a-22) to (B1a-38) are preferred.

[0195] Z +Examples of the organic cation 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. Specific examples include cations represented by any of formulas (b2-1) to (b2-4) (hereinafter, sometimes referred to as "cation (b2-1)" depending on the formula number).

[0196] TIFF0007742222000113.tif48169In equations (b2-1) to (b2-4), R b4 ~R b6 each independently represent 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, a hydrogen atom 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, a hydrogen atom 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, and a hydrogen atom 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 and may be bonded to each other to form a ring together with the sulfur atom to which they are attached, and -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, or an alkoxy group having 1 to 12 carbon atoms. m2 and n2 each independently represent an integer of 0 to 5; When m2 is 2 or more, multiple R b7may be the same or different, and when n2 is 2 or more, multiple 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 and may be bonded to each other to form a ring together with the sulfur atom to which they are attached, and -CH2- contained in the ring may be replaced with -O-, -S- or -CO-. R b11 represents 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, or 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 the -CH-CO- to which they are bonded, and -CH2- contained in the ring may be replaced by -O-, -S- or -CO-. R b13 ~R b18 each independently represents a halogen atom, a hydroxy group, an aliphatic hydrocarbon group having 1 to 12 carbon atoms, or an alkoxy group having 1 to 12 carbon atoms. L b31 represents a sulfur atom or an oxygen atom. o2, p2, s2, and t2 each independently represent an integer of 0 to 5. q2 and r2 each independently represent an integer of 0 to 4; u2 represents 0 or 1. When o2 is 2 or more, multiple R b13 are the same or different, and when p2 is 2 or more, multiple Rb14 are the same or different, and when q2 is 2 or more, multiple R b15 are the same or different, and when r2 is 2 or more, multiple R b16 are the same or different, and when s2 is 2 or more, multiple R b17 are the same or different, and when t2 is 2 or more, multiple R b18 are the same or different.

[0197] The aliphatic hydrocarbon group refers to a chain hydrocarbon group and an alicyclic hydrocarbon group. Examples of the chain hydrocarbon group include alkyl groups such as methyl, ethyl, propyl, isopropyl, butyl, sec-butyl, tert-butyl, pentyl, hexyl, octyl, and 2-ethylhexyl. In particular, R b9 ~R b12 The chain hydrocarbon group preferably has 1 to 12 carbon atoms. The alicyclic hydrocarbon group may be either monocyclic or polycyclic, and examples of the monocyclic alicyclic hydrocarbon group include cycloalkyl groups such as cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, cyclooctyl, and cyclodecyl. Examples of the polycyclic alicyclic hydrocarbon group include decahydronaphthyl, adamantyl, and norbornyl groups, as well as the following groups: TIFF0007742222000114.tif10158 In particular, R b9 ~R b12 The alicyclic hydrocarbon group preferably has 3 to 18 carbon atoms, and more preferably has 4 to 12 carbon atoms.

[0198] Examples of the alicyclic hydrocarbon group in which a hydrogen atom is substituted with an aliphatic hydrocarbon group include a methylcyclohexyl group, a dimethylcyclohexyl group, a 2-methyladamantan-2-yl group, a 2-ethyladamantan-2-yl group, a 2-isopropyladamantan-2-yl group, a methylnorbornyl group, an isobornyl group, etc. In the alicyclic hydrocarbon group in which a hydrogen atom is substituted with an aliphatic hydrocarbon group, the total number of carbon atoms in the alicyclic hydrocarbon group and the aliphatic hydrocarbon group is preferably 20 or less. The fluorinated alkyl group refers to an alkyl group having 1 to 12 carbon atoms and a fluorine atom, and examples thereof include a fluoromethyl group, a difluoromethyl group, a trifluoromethyl group, a perfluorobutyl group, etc. The number of carbon atoms in the fluorinated alkyl group is preferably 1 to 9, more preferably 1 to 6, and even more preferably 1 to 4.

[0199] Examples of aromatic hydrocarbon groups include aryl groups such as a phenyl group, a biphenyl group, a naphthyl group, a phenanthryl group, etc. The aromatic hydrocarbon group may have a chain hydrocarbon group or an alicyclic hydrocarbon group, and examples thereof include aromatic hydrocarbon groups having a chain hydrocarbon group (such as a tolyl group, a xylyl group, a cumenyl group, a mesityl group, a p-ethylphenyl group, a p-tert-butylphenyl group, a 2,6-diethylphenyl group, a 2-methyl-6-ethylphenyl group, etc.) and aromatic hydrocarbon groups having an alicyclic hydrocarbon group (such as a p-cyclohexylphenyl group, a 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 preferred. Examples of aromatic hydrocarbon groups in which hydrogen atoms are substituted with alkoxy groups include p-methoxyphenyl groups. Examples of the chain hydrocarbon group in which a hydrogen atom is substituted with an aromatic hydrocarbon group include aralkyl groups such as benzyl, phenethyl, phenylpropyl, trityl, naphthylmethyl, and naphthylethyl.

[0200] 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 alkylcarbonyl group include an acetyl group, a propionyl group, and a butyryl group. Examples of the halogen atom include a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom. Examples of the alkylcarbonyloxy group include a methylcarbonyloxy group, an ethylcarbonyloxy group, a propylcarbonyloxy group, an isopropylcarbonyloxy group, a butylcarbonyloxy group, a sec-butylcarbonyloxy group, a tert-butylcarbonyloxy group, a pentylcarbonyloxy group, a hexylcarbonyloxy group, an octylcarbonyloxy group, and a 2-ethylhexylcarbonyloxy group.

[0201] R b4 and R b5 and bond to each other and form a ring together with the sulfur atom to which they are bonded, which may be a monocyclic, polycyclic, aromatic, non-aromatic, saturated, or unsaturated ring. This ring may be a ring having 3 to 18 carbon atoms, preferably a ring having 4 to 18 carbon atoms. Furthermore, the ring containing a sulfur atom may be a 3- to 12-membered ring, preferably a 3- to 7-membered ring, for example, the following rings. * represents a bond. TIFF0007742222000115.tif23143

[0202] R b9 and R b10 The ring formed by these together may be any of monocyclic, polycyclic, aromatic, non-aromatic, saturated and unsaturated rings. This ring may be a 3- to 12-membered ring, preferably a 3- to 7-membered ring. Examples thereof include a thiolan-1-ium ring (tetrahydrothiophenium ring), a thian-1-ium ring, and a 1,4-oxathian-4-ium ring. R b11 and R b12 The ring formed by combining these may be any of monocyclic, polycyclic, aromatic, non-aromatic, saturated and unsaturated rings. Examples of this ring include a 3- to 12-membered ring, and preferably a 3- to 7-membered ring. Examples include an oxocycloheptane ring, an oxocyclohexane ring, an oxonorbornane ring, and an oxoadamantane ring.

[0203] Among the cations (b2-1) to (b2-4), the cation (b2-1) is preferred. Examples of the cation (b2-1) include the following cations. TIFF0007742222000116.tif80158

[0204] TIFF0007742222000117.tif68161

[0205] TIFF0007742222000118.tif3496

[0206] Examples of the cation (b2-2) include the following cations. TIFF0007742222000119.tif19150

[0207] Examples of the cation (b2-3) include the following cations. TIFF0007742222000120.tif26140

[0208] Examples of the cation (b2-4) include the following cations. TIFF0007742222000121.tif84167

[0209] TIFF0007742222000122.tif3041

[0210] The acid generator (B) is a combination of the above-mentioned anions and the above-mentioned organic cations, which can be combined arbitrarily. Preferred examples of the acid generator (B) include a combination of an anion represented by any of formulas (B1a-1) to (B1a-3), (B1a-7) to (B1a-16), (B1a-18), (B1a-19), and (B1a-22) to (B1a-38) with a cation (b2-1), a cation (b2-3), or a cation (b2-4).

[0211] The acid generator (B) is preferably one represented by formulas (B1-1) to (B1-56), of which those containing an arylsulfonium cation are preferred, and those represented by formulas (B1-1) to (B1-3), (B1-5) to (B1-7), (B1-11) to (B1-14), (B1-20) to (B1-26), (B1-29), and (B1-31) to (B1-56) are particularly preferred. TIFF0007742222000123.tif59140

[0212] TIFF0007742222000124.tif68149

[0213] TIFF0007742222000125.tif133146

[0214] TIFF0007742222000126.tif87145

[0215] TIFF0007742222000127.tif62153

[0216] TIFF0007742222000128.tif68168

[0217] TIFF0007742222000129.tif93158

[0218] In the resist composition of the present invention, the content of the acid generator is preferably from 1 to 40 parts by mass, more preferably from 3 to 40 parts by mass, and even more preferably from 10 to 40 parts by mass, per 100 parts by mass of the resin (A). The resist composition of the present invention may contain one type of acid generator (B) alone, or may contain multiple types.

[0219] <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, and 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. 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-butyrolactone; and the like. One kind of the solvent (E) may be used alone, or two or more kinds may be used.

[0220] <Quencher (C)> Examples of the quencher (C) include salts that generate an acid with a lower acidity than the acid generated from the acid generator (B) and basic nitrogen-containing organic compounds. When the resist composition contains the quencher (C), the content of the quencher (C) is preferably about 0.01 to 15% by mass, more preferably about 0.01 to 10% by mass, still more preferably about 0.01 to 7% by mass, and still more preferably about 0.1 to 3% by mass, based on the solid content of the resist composition.

[0221] <Salt that generates an acid with a lower acidity than the acid generated from the acid generator> The acidity of the salt that generates an acid with a lower acidity than the acid generated from the acid generator (B) is indicated by the acid dissociation constant (pKa). The salt that generates an acid with a lower acidity than the acid generated from the acid generator (B) is usually a salt with an acid dissociation constant of the acid generated from the salt of -3 < pKa, preferably a salt of -1 < pKa < 7, and more preferably a salt of 0 < pKa < 5. Examples of salts that generate an acid that is weaker in acidity than the acid generated from acid generator (B) include salts represented by the following formula, salts represented by formula (D) described in JP 2015-147926 A (hereinafter sometimes referred to as "weak acid inner salt (D)"), and salts described in JP 2012-229206 A, JP 2012-6908 A, JP 2012-72109 A, JP 2011-39502 A, and JP 2011-191745 A. Preferred are salts that generate a carboxylic acid that is weaker in acidity than the acid generated from acid generator (B) (salts having a carboxylic acid anion), and more preferred are weak acid inner salts (D). TIFF0007742222000130.tif84165

[0222] Examples of the weak acid inner salt (D) include the following salts. TIFF0007742222000131.tif72165

[0223] The basic nitrogen-containing organic compound includes amines and ammonium salts. The amines include aliphatic amines and aromatic amines. The aliphatic amines include primary amines, secondary amines, and tertiary amines. Amines include 1-naphthylamine, 2-naphthylamine, aniline, diisopropylaniline, 2-, 3- or 4-methylaniline, 4-nitroaniline, N-methylaniline, N,N-dimethylaniline, diphenylamine, hexylamine, heptylamine, octylamine, nonylamine, decylamine, dibutylamine, dipentylamine, dihexylamine, diheptylamine, dioctylamine, dinonylamine, didecylamine, triethylamine, trimethylamine, tripropylamine, tributylamine, Amine, tripentylamine, trihexylamine, triheptylamine, trioctylamine, trinonylamine, tridecylamine, methyldibutylamine, methyldipentylamine, methyldihexylamine, methyldicyclohexylamine, methyldiheptylamine, methyldioctylamine, methyldinonylamine, methyldidecylamine, ethyldibutylamine, ethyldipentylamine, ethyldihexylamine, ethyldiheptylamine, ethyldioctylamine, ethyldinonylamine, ethyldidecylamine amine, dicyclohexylmethylamine, tris[2-(2-methoxyethoxy)ethyl]amine, triisopropanolamine, ethylenediamine, tetramethylenediamine, hexamethylenediamine, 4,4'-diamino-1,2-diphenylethane, 4,4'-diamino-3,3'-dimethyldiphenylmethane, 4,4'-diamino-3,3'-diethyldiphenylmethane, 2,2'-methylenebisaniline, imidazole, 4-methylimidazole, pyridine, 4-methylpyridine, 1,2-di(2-pyridyl)ethane Examples of the amines include 1,2-di(4-pyridyl)ethane, 1,2-di(2-pyridyl)ethene, 1,2-di(4-pyridyl)ethene, 1,3-di(4-pyridyl)propane, 1,2-di(4-pyridyloxy)ethane, di(2-pyridyl)ketone, 4,4'-dipyridyl sulfide, 4,4'-dipyridyl disulfide, 2,2'-dipyridylamine, 2,2'-dipicolylamine, and bipyridine. Preferred are aromatic amines such as diisopropylaniline, and more preferred is 2,6-diisopropylaniline. Examples of ammonium salts include tetramethylammonium hydroxide, tetraisopropylammonium hydroxide, tetrabutylammonium hydroxide, tetrahexylammonium hydroxide, tetraoctylammonium hydroxide, phenyltrimethylammonium hydroxide, 3-(trifluoromethyl)phenyltrimethylammonium hydroxide, tetra-n-butylammonium salicylate, and choline.

[0224] <Other ingredients> The resist composition of the present invention may optionally contain components other than those described above (hereinafter, these may be referred to as "other components (F)"). There are no particular limitations on the other components (F), and additives known in the resist field, such as sensitizers, dissolution inhibitors, surfactants, stabilizers, and dyes, can be used.

[0225] <Preparation of Resist Composition> The resist composition of the present invention can be prepared by mixing the resin (A) of the present invention, the acid generator (B), a salt that generates an acid weaker in acidity than the acid generated by the acid generator, and, if necessary, the resin (A2), the resin (X), the quencher (C), the solvent (E), and other components (F). The order of mixing is arbitrary and is not particularly limited. The temperature during mixing can be selected from 10 to 40°C, depending on the type of resin, the solubility of the resin in the solvent (E), and other factors. The mixing time can be selected from 0.5 to 24 hours, depending on the mixing temperature. The mixing method is also not particularly limited, and stirring and mixing can be used. After mixing the components, it is preferable to filter the mixture using a filter with a pore size of about 0.003 to 0.2 μm.

[0226] <Method for Producing Resist Pattern> The method for producing a resist pattern of the present invention comprises the steps of: (1) applying the resist composition of the present invention onto a substrate; (2) drying the applied composition to form a composition layer; (3) exposing the composition layer to light; (4) heating the composition layer after exposure; and (5) A step of developing the composition layer after heating is included. The resist composition can be applied to a substrate using a commonly used device such as a spin coater. Examples of the substrate include inorganic substrates such as silicon wafers. Before applying the resist composition, the substrate may be cleaned, and an anti-reflective film or the like may be formed on the substrate. The composition after coating is dried to remove the solvent and form a composition layer. Drying is carried out, for example, by evaporating the solvent using a heating device such as a hot plate (so-called pre-baking), or by using a vacuum device. The heating temperature is preferably 50 to 200°C, and the heating time is preferably 10 to 180 seconds. The pressure during vacuum drying is preferably 1 to 1.0 x 10 5 It is preferable that the pressure is about Pa. The resulting composition layer is typically exposed using an exposure machine. The exposure machine may be an immersion exposure machine. Various exposure light sources can be used, including those that emit ultraviolet laser light such as KrF excimer laser (wavelength 248 nm), ArF excimer laser (wavelength 193 nm), and F2 excimer laser (wavelength 157 nm); those that convert the wavelength of laser light from a solid-state laser source (such as a YAG or semiconductor laser) to emit harmonic laser light in the far ultraviolet or vacuum ultraviolet range; and those that irradiate with electron beams or extreme ultraviolet light (EUV). In this specification, irradiation with these types of radiation may be collectively referred to as "exposure." During exposure, exposure is typically performed through a mask corresponding to the desired pattern. When the exposure light source is an electron beam, exposure may be performed by direct writing without using a mask. The composition layer after exposure is subjected to a heat treatment (so-called post-exposure bake) to promote the deprotection reaction of the acid labile groups. The heating temperature is usually about 50 to 200°C, preferably about 70 to 150°C. The heated composition layer is usually developed using a developer in a developing device. Development methods include dipping, puddling, spraying, and dynamic dispensing. The development temperature is preferably, for example, 5 to 60°C, and the development time is preferably, for example, 5 to 300 seconds. By selecting the type of developer as follows, a positive resist pattern or a negative resist pattern can be produced. When a positive resist pattern is produced from the resist composition of the present invention, an alkaline developer is used as the developer. The alkaline developer may be any of various alkaline aqueous solutions used in this field. Examples include aqueous solutions of tetramethylammonium hydroxide and (2-hydroxyethyl)trimethylammonium hydroxide (commonly known as choline). The alkaline developer may also contain a surfactant. After development, the resist pattern is preferably washed with ultrapure water, and then water remaining on the substrate and pattern is removed. When a negative resist pattern is produced from the resist composition of the present invention, a developer containing an organic solvent (hereinafter sometimes referred to as an "organic developer") is used as the developer. Examples of organic solvents contained in organic developers include ketone solvents such as 2-hexanone and 2-heptanone; glycol ether ester solvents such as propylene glycol monomethyl ether acetate; ester solvents such as butyl acetate; glycol ether solvents such as propylene glycol monomethyl ether; amide solvents such as N,N-dimethylacetamide; and aromatic hydrocarbon solvents such as anisole. The content of the organic solvent in the organic developer is preferably 90% by mass or more and 100% by mass or less, more preferably 95% by mass or more and 100% by mass or less, and even more preferably substantially only the organic solvent. Among these, the organic developer is preferably a developer containing butyl acetate and / or 2-heptanone. The total content of butyl acetate and 2-heptanone in the organic developer is preferably 50% by mass or more and 100% by mass or less, more preferably 90% by mass or more and 100% by mass or less, and even more preferably substantially only butyl acetate and / or 2-heptanone. The organic developer may contain a surfactant and a small amount of water. During development, development may be stopped by replacing the organic developer with a different type of solvent. The developed resist pattern is preferably washed with a rinse solution. There are no particular limitations on the rinse solution as long as it does not dissolve the resist pattern, and a solution containing a general organic solvent can be used, preferably an alcohol solvent or an ester solvent. After cleaning, it is preferable to remove the rinse liquid remaining on the substrate and the pattern.

[0227] <Application> The resist composition of the present invention is suitable as a resist composition for KrF excimer laser exposure, a resist composition for ArF excimer laser exposure, a resist composition for electron beam (EB) exposure, or a resist composition for EUV exposure, and is more suitable as a resist composition for electron beam (EB) exposure or a resist composition for EUV exposure, and is useful for semiconductor microfabrication. [Example]

[0228] The present invention will be explained in more detail with reference to examples. In the examples, "%" and "parts" representing the content or amount used are by mass unless otherwise specified. The weight average molecular weight is a value determined by gel permeation chromatography under the following conditions. Device: HLC-8120GPC model (Tosoh Corporation) Column: TSKgel Multipore H XL -M x 3 + guard column (Tosoh) Eluent: tetrahydrofuran Flow rate: 1.0mL / min Detector: RI detector Column temperature: 40℃ Injection volume: 100μl Molecular weight standard: Standard polystyrene (Tosoh Corporation) The structure of the compound was confirmed by measuring the molecular ion peak using mass spectrometry (LC: Agilent 1100, MASS: Agilent LC / MSD). In the following examples, the value of this molecular ion peak is indicated by "MASS."

[0229] Synthesis Example 1: Synthesis of compound represented by formula (I-1) 7.27 parts of the compound represented by formula (I-1-a), 15.22 parts of the compound represented by formula (I-1-b), and 100 parts of chloroform were charged and stirred at 23°C for 30 minutes. Then, 0.61 parts of sulfuric acid was added and refluxed at 60°C for 6 hours in the presence of molecular sieves, and then cooled to 23°C. 65 parts of 10% aqueous potassium carbonate solution was added to the resulting reaction mixture and stirred at 23°C for 30 minutes. The mixture was then allowed to stand and separated. 60 parts of ion-exchanged water was added to the recovered organic layer, and the mixture was stirred at 23°C for 30 minutes. The organic layer was then recovered by separation. This water washing procedure was repeated four times. The obtained organic layer was concentrated, and the concentrated mass was separated by a column (silica gel 60N (spherical, neutral) 100-210 μm; manufactured by Kanto Chemical Co., Inc., developing solvent: n-heptane / ethyl acetate=10 / 1) to obtain 10.48 parts of the compound represented by formula (I-1-c). TIFF0007742222000133.tif40129 0.65 parts of a compound represented by formula (I-1-d) and 20 parts of acetonitrile were mixed and stirred at 23 ° C for 30 minutes, after which 1.34 parts of a compound represented by formula (I-1-e) was added, the mixture was heated to 50 ° C, and stirred at 50 ° C for 2 hours. 1.95 parts of a compound represented by formula (I-1-c) was added to the resulting mixture and stirred at 50 ° C for 2 hours. The resulting mixture was cooled to 23 ° C, and then 50 parts of chloroform and 20 parts of ion-exchanged water were added. The mixture was stirred at 23 ° C for 30 minutes, followed by separation and the organic layer was isolated. 20 parts of ion-exchanged water was added to the resulting organic layer, and the mixture was stirred at 23 ° C for 30 minutes, followed by separation and the organic layer was isolated. This water washing procedure was repeated five times. The obtained organic layer was concentrated, and the concentrated mixture was separated using a column (silica gel 60N (spherical, neutral) 100-210 μm; manufactured by Kanto Chemical Co., Inc., developing solvent: n-heptane / ethyl acetate=1 / 1) to obtain 1.89 parts of the compound represented by formula (I-1). MASS:329.1[M+H] +

[0230] Synthesis Example 2: Synthesis of compound represented by formula (I-6) 6.39 parts of the compound represented by formula (I-6-a), 15.22 parts of the compound represented by formula (I-1-b), and 100 parts of chloroform were charged and stirred at 23°C for 30 minutes. Then, 0.61 parts of sulfuric acid was added and the mixture was refluxed at 60°C for 6 hours in the presence of molecular sieves, and then cooled to 23°C. 65 parts of 10% aqueous potassium carbonate solution was added to the resulting reaction mixture and stirred at 23°C for 30 minutes. The mixture was then allowed to stand and separated. 60 parts of ion-exchanged water was added to the recovered organic layer, and the mixture was stirred at 23°C for 30 minutes. The organic layer was then recovered by separation. This water washing procedure was repeated four times. The obtained organic layer was concentrated, and the concentrated mass was separated using a column (silica gel 60N (spherical, neutral) 100-210 μm; manufactured by Kanto Chemical Co., Inc., developing solvent: n-heptane / ethyl acetate = 10 / 1) to obtain 12.21 parts of the compound represented by formula (I-6-c). TIFF0007742222000135.tif45132 0.65 parts of a compound represented by formula (I-1-d) and 20 parts of acetonitrile were mixed and stirred at 23 ° C for 30 minutes, after which 1.34 parts of a compound represented by formula (I-1-e) was added, the mixture was heated to 50 ° C, and stirred at 50 ° C for 2 hours. 1.84 parts of a compound represented by formula (I-6-c) was added to the resulting mixture and stirred at 50 ° C for 2 hours. The resulting mixture was cooled to 23 ° C, and then 50 parts of chloroform and 20 parts of ion-exchanged water were added and stirred at 23 ° C for 30 minutes, after which the organic layer was separated and isolated. 20 parts of ion-exchanged water was added to the resulting organic layer and stirred at 23 ° C for 30 minutes, after which the organic layer was separated and isolated. This water washing procedure was repeated five times. The obtained organic layer was concentrated, and the concentrated mixture was separated using a column (silica gel 60N (spherical, neutral) 100-210 μm; manufactured by Kanto Chemical Co., Inc., developing solvent: n-heptane / ethyl acetate=1 / 1) to obtain 1.66 parts of the compound represented by formula (I-6). MASS:315.1[M+H] +

[0231] Synthesis Example 3: Synthesis of compound represented by formula (I-24) TIFF0007742222000136.tif30106 4.63 parts of the compound represented by formula (I-24-a), 15.22 parts of the compound represented by formula (I-1-b), and 100 parts of chloroform were charged and stirred at 23 ° C for 30 minutes, after which 0.61 parts of sulfuric acid was charged and refluxed at 60 ° C for 6 hours in the presence of molecular sieves, and then cooled to 23 ° C. 65 parts of 10% aqueous potassium carbonate solution was added to the resulting reaction mixture and stirred at 23 ° C for 30 minutes. The mixture was then allowed to stand and separated. 60 parts of ion-exchanged water was charged to the recovered organic layer, and the mixture was stirred at 23 ° C for 30 minutes, followed by separation to recover the organic layer. This water washing procedure was repeated four times. The obtained organic layer was concentrated, and the concentrated mass was separated by a column (silica gel 60N (spherical, neutral) 100-210 μm; manufactured by Kanto Chemical Co., Inc., developing solvent: n-heptane / ethyl acetate=10 / 1) to obtain 10.18 parts of the compound represented by formula (I-24-c). 2.98 parts of the compound represented by formula (I-24-d) and 15 parts of acetonitrile were charged and stirred at 23°C for 30 minutes. Then, 2.13 parts of the compound represented by formula (I-1-e) were charged, and the mixture was stirred at 50°C for 2 hours and cooled to 23°C. 3.41 parts of the compound represented by formula (I-24-c) were added to the resulting reaction mixture, and the mixture was stirred at 23°C for 30 minutes and then stirred at 50°C for 10 hours. The resulting reaction mixture was concentrated, and 30 parts of chloroform and 15 parts of ion-exchanged water were charged to the concentrated residue, and the mixture was stirred at 23°C for 30 minutes. The organic layer was recovered by separation. 15 parts of ion-exchanged water was charged to the recovered organic layer, and the mixture was stirred at 23°C for 30 minutes. The organic layer was recovered by separation. This water washing procedure was repeated five times. The obtained organic layer was concentrated to obtain 3.98 parts of a compound represented by formula (I-24-e). 0.65 parts of the compound represented by formula (I-1-a) and 20 parts of acetonitrile were mixed and stirred at 23°C for 30 minutes. Then, 1.34 parts of the compound represented by formula (I-1-b) were added, and the mixture was heated to 50°C and stirred at 50°C for 2 hours. 3.29 parts of the compound represented by formula (I-24-e) were added to the resulting mixture and stirred at 50°C for 2 hours. The resulting mixture was cooled to 23°C, and 50 parts of chloroform and 20 parts of ion-exchanged water were added. The mixture was stirred at 23°C for 30 minutes, and then separated to separate the organic layer. 20 parts of ion-exchanged water was added to the resulting organic layer, and the mixture was stirred at 23°C for 30 minutes. The organic layer was then separated to separate the organic layer. This water washing procedure was repeated five times. The obtained organic layer was concentrated, and the concentrated mixture was separated using a column (silica gel 60N (spherical, neutral) 100-210 μm; manufactured by Kanto Chemical Co., Inc., developing solvent: n-heptane / ethyl acetate=1 / 1) to obtain 2.88 parts of the compound represented by formula (I-24). MASS:507.1[M+H] +

[0232] Example 1: Synthesis of compound represented by formula (IA-26a) 1.12 parts of the compound represented by formula (I-26a-d) and 20 parts of acetonitrile were mixed and stirred at 23°C for 30 minutes. Then, 1.34 parts of the compound represented by formula (I-1-e) were added, and the mixture was heated to 50°C and stirred at 50°C for 2 hours. 1.95 parts of the compound represented by formula (I-1-c) were added to the resulting mixture and stirred at 50°C for 2 hours. The resulting mixture was cooled to 23°C, and 50 parts of chloroform and 20 parts of ion-exchanged water were added. The mixture was stirred at 23°C for 30 minutes, and then the organic layer was separated and isolated. 20 parts of ion-exchanged water was added to the resulting organic layer and stirred at 23°C for 30 minutes. The organic layer was then separated and isolated. This water washing procedure was repeated five times. The obtained organic layer was concentrated, and the concentrated mixture was separated using a column (silica gel 60N (spherical, neutral) 100-210 μm; manufactured by Kanto Chemical Co., Inc., developing solvent: n-heptane / ethyl acetate=1 / 1) to obtain 1.66 parts of the compound represented by formula (IA-26a). MASS:391.2[M+H] +

[0233] Example 2: Synthesis of compound represented by formula (IA-27) 1.56 parts of the compound represented by formula (I-27-d) and 20 parts of acetonitrile were mixed and stirred at 23°C for 30 minutes. Then, 1.34 parts of the compound represented by formula (I-1-e) were added, and the mixture was heated to 50°C and stirred at 50°C for 2 hours. 1.95 parts of the compound represented by formula (I-1-c) were added to the resulting mixture and stirred at 50°C for 2 hours. The resulting mixture was cooled to 23°C, and 50 parts of chloroform and 20 parts of ion-exchanged water were added. The mixture was stirred at 23°C for 30 minutes, and then the organic layer was separated and isolated. 20 parts of ion-exchanged water was added to the resulting organic layer and stirred at 23°C for 30 minutes. The organic layer was then separated and isolated. This water washing procedure was repeated five times. The obtained organic layer was concentrated, and the concentrated mixture was separated using a column (silica gel 60N (spherical, neutral) 100-210 μm; manufactured by Kanto Chemical Co., Inc., developing solvent: n-heptane / ethyl acetate=1 / 1) to obtain 2.12 parts of the compound represented by formula (IA-27). MASS: 449.2 [M+H] +

[0234] Example 3: Synthesis of compound represented by formula (IA-30) TIFF0007742222000141.tif63136 1.35 parts of a compound represented by formula (I-30-d) and 20 parts of acetonitrile were mixed and stirred at 23°C for 30 minutes, after which 1.34 parts of a compound represented by formula (I-1-e) was added, the mixture was heated to 50°C, and stirred at 50°C for 2 hours. 1.95 parts of a compound represented by formula (I-1-c) was added to the resulting mixture and stirred at 50°C for 2 hours. The resulting mixture was cooled to 23°C, and then 50 parts of chloroform and 20 parts of ion-exchanged water were added. The mixture was stirred at 23°C for 30 minutes, followed by separation to separate the organic layer. 20 parts of ion-exchanged water was added to the resulting organic layer, and the mixture was stirred at 23°C for 30 minutes, followed by separation to separate the organic layer. This water washing procedure was repeated five times. The obtained organic layer was concentrated, and the concentrated mixture was separated using a column (silica gel 60N (spherical, neutral) 100-210 μm; manufactured by Kanto Chemical Co., Inc., developing solvent: n-heptane / ethyl acetate=1 / 1) to obtain 1.99 parts of the compound represented by formula (I-30). MASS: 465.2 [M+H] +

[0235] Synthesis Example 4: Synthesis of compound represented by formula (I-5) 7.27 parts of the compound represented by formula (I-1-a), 5.83 parts of the compound represented by formula (I-5-b), and 100 parts of chloroform were charged and stirred at 23°C for 30 minutes. Then, 0.61 parts of sulfuric acid was added and the mixture was refluxed at 60°C for 6 hours in the presence of molecular sieves, and then cooled to 23°C. 65 parts of 10% aqueous potassium carbonate solution was added to the resulting reaction mixture and stirred at 23°C for 30 minutes. The mixture was then allowed to stand and separated. 60 parts of ion-exchanged water was added to the recovered organic layer, and the mixture was stirred at 23°C for 30 minutes. The organic layer was then recovered by separation. This water washing procedure was repeated four times. The obtained organic layer was concentrated, and the concentrated mass was separated by a column (silica gel 60N (spherical, neutral) 100-210 μm; manufactured by Kanto Chemical Co., Inc., developing solvent: n-heptane / ethyl acetate=10 / 1) to obtain 6.72 parts of the compound represented by formula (I-5-c). TIFF0007742222000143.tif39129 0.65 parts of a compound represented by formula (I-1-d) and 20 parts of acetonitrile were mixed and stirred at 23 ° C for 30 minutes, after which 1.34 parts of a compound represented by formula (I-1-e) was added, the mixture was heated to 50 ° C, and stirred at 50 ° C for 2 hours. 1.20 parts of a compound represented by formula (I-5-c) was added to the resulting mixture and stirred at 50 ° C for 2 hours. The resulting mixture was cooled to 23 ° C, and then 50 parts of chloroform and 20 parts of ion-exchanged water were added and stirred at 23 ° C for 30 minutes, after which the organic layer was separated and isolated. 20 parts of ion-exchanged water was added to the resulting organic layer and stirred at 23 ° C for 30 minutes, after which the organic layer was separated and isolated. This water washing procedure was repeated five times. The obtained organic layer was concentrated, and the concentrated mixture was separated using a column (silica gel 60N (spherical, neutral) 100-210 μm; manufactured by Kanto Chemical Co., Inc., developing solvent: n-heptane / ethyl acetate=1 / 1) to obtain 1.12 parts of the compound represented by formula (I-5). MASS:229.1[M+H] +

[0236] Example 4: Synthesis of compound represented by formula (IA-33a) 1.12 parts of the compound represented by formula (I-26a-d) and 20 parts of acetonitrile were mixed and stirred at 23°C for 30 minutes. Then, 1.34 parts of the compound represented by formula (I-1-b) were added, and the mixture was heated to 50°C and stirred at 50°C for 2 hours. 3.29 parts of the compound represented by formula (I-24-e) were added to the resulting mixture and stirred at 50°C for 2 hours. The resulting mixture was cooled to 23°C, and 50 parts of chloroform and 20 parts of ion-exchanged water were added. The mixture was stirred at 23°C for 30 minutes, and then the organic layer was separated and isolated. 20 parts of ion-exchanged water was added to the resulting organic layer and stirred at 23°C for 30 minutes. The organic layer was separated and isolated. This water washing procedure was repeated five times. The obtained organic layer was concentrated, and the concentrated mixture was separated using a column (silica gel 60N (spherical, neutral) 100-210 μm; manufactured by Kanto Chemical Co., Inc., developing solvent: n-heptane / ethyl acetate=1 / 1) to obtain 2.34 parts of the compound represented by formula (IA-33a). MASS:569.2[M+H] +

[0237] Example 5: Synthesis of compound represented by formula (IA-34) 1.56 parts of the compound represented by formula (I-27-d) and 20 parts of acetonitrile were mixed and stirred at 23°C for 30 minutes. Then, 1.34 parts of the compound represented by formula (I-1-b) were added, and the mixture was heated to 50°C and stirred at 50°C for 2 hours. 3.29 parts of the compound represented by formula (I-24-e) were added to the resulting mixture and stirred at 50°C for 2 hours. The resulting mixture was cooled to 23°C, and 50 parts of chloroform and 20 parts of ion-exchanged water were added. The mixture was stirred at 23°C for 30 minutes, and then separated to separate the organic layer. 20 parts of ion-exchanged water was added to the resulting organic layer, and the mixture was stirred at 23°C for 30 minutes. The organic layer was then separated to separate the organic layer. This water washing procedure was repeated five times. The obtained organic layer was concentrated, and the concentrated mixture was separated using a column (silica gel 60N (spherical, neutral) 100-210 μm; manufactured by Kanto Chemical Co., Inc., developing solvent: n-heptane / ethyl acetate=1 / 1) to obtain 2.46 parts of the compound represented by formula (IA-34). MASS:627.3[M+H] +

[0238] Resin synthesis The compounds (monomers) used in addition to acetoxystyrene in the synthesis of the resin are shown below. TIFF0007742222000146.tif135169Hereinafter, these monomers will be referred to as "monomer (a1-1-3)" etc. according to their formula numbers.

[0239] Example 6 [Synthesis of Resin A1] Acetoxystyrene, monomer (a1-1-3), and monomer (I-1) were used as monomers and mixed in a molar ratio of 38:24:38 [acetoxystyrene:monomer (a1-1-3):monomer (I-1)]. This monomer mixture was then mixed with methyl isobutyl ketone in an amount 1.5 times the total mass of all monomers. Azobisisobutyronitrile and azobis(2,4-dimethylvaleronitrile) were added as initiators to the resulting mixture, at 2.1 mol% and 6.3 mol%, respectively, based on the total monomer amount. Polymerization was carried out by heating at 73°C for approximately 5 hours. A 25% aqueous solution of tetramethylammonium hydroxide was then added to the polymerization reaction mixture, which was stirred for 12 hours and then separated. The resulting organic layer was poured into a large amount of n-heptane to precipitate a resin. The resin was then filtered and recovered, yielding a polymer with a weight-average molecular weight of approximately 5.3 x 10. 3 Resin A1 (copolymer) having the following structural units was obtained in a yield of 68%. TIFF0007742222000147.tif32110

[0240] Example 7 [Synthesis of Resin A2] Acetoxystyrene, monomer (a1-1-3), and monomer (I-6) were used as monomers and mixed in a molar ratio of 38:24:38 [acetoxystyrene:monomer (a1-1-3):monomer (I-6)]. This monomer mixture was then mixed with methyl isobutyl ketone in an amount 1.5 times the total mass of all monomers. Azobisisobutyronitrile and azobis(2,4-dimethylvaleronitrile) were added as initiators to the resulting mixture, at 2.1 mol% and 6.3 mol%, respectively, based on the total monomer amount. Polymerization was carried out by heating at 73°C for approximately 5 hours. A 25% aqueous solution of tetramethylammonium hydroxide was then added to the polymerization reaction mixture, which was stirred for 12 hours and then separated. The resulting organic layer was poured into a large amount of n-heptane to precipitate a resin. The resin was then filtered and recovered, yielding a polymer with a weight-average molecular weight of approximately 5.1 x 10. 3 Resin A2 (copolymer) having the following structural units was obtained in a yield of 60%. TIFF0007742222000148.tif33110

[0241] Example 8 [Synthesis of Resin A3] Acetoxystyrene, monomer (a1-2-6), and monomer (I-1) were used as monomers and mixed in a molar ratio of 38:38:24 [acetoxystyrene:monomer (a1-2-6):monomer (I-1)]. This monomer mixture was then mixed with methyl isobutyl ketone in an amount 1.5 times the total mass of all monomers. Azobisisobutyronitrile and azobis(2,4-dimethylvaleronitrile) were added as initiators to the resulting mixture, at 2.1 mol% and 6.3 mol%, respectively, based on the total monomer amount. Polymerization was carried out by heating at 73°C for approximately 5 hours. A 25% aqueous solution of tetramethylammonium hydroxide was then added to the polymerization reaction mixture, which was stirred for 12 hours and then separated. The resulting organic layer was poured into a large amount of n-heptane to precipitate a resin. The resin was then filtered and recovered, yielding a polymer with a weight-average molecular weight of approximately 5.2 x 10. 3 Resin A3 (copolymer) having the following structural units was obtained in a yield of 88%. TIFF0007742222000149.tif31110

[0242] Example 9 [Synthesis of Resin A4] Acetoxystyrene and monomer (I-1) were used as monomers and mixed at a molar ratio [acetoxystyrene:monomer (I-1)] of 38:62. Furthermore, methyl isobutyl ketone was added to this monomer mixture in an amount of 1.5 times the total mass of all monomers. Azobisisobutyronitrile and azobis(2,4-dimethylvaleronitrile) were added as initiators to the resulting mixture in amounts of 2.1 mol% and 6.3 mol%, respectively, based on the total monomer amount. Polymerization was carried out by heating at 73°C for approximately 5 hours. Subsequently, a 25% aqueous solution of tetramethylammonium hydroxide was added to the polymerization reaction solution, which was stirred for 12 hours and then separated. The resulting organic layer was poured into a large amount of n-heptane to precipitate a resin. The resin was then filtered and recovered, yielding a polymer with a weight-average molecular weight of approximately 5.5 x 10. 3 Resin A4 (copolymer) having the following structural units was obtained in a yield of 65%. TIFF0007742222000150.tif3187

[0243] Example 10 [Synthesis of Resin A5] Acetoxystyrene, monomer (a1-1-3), and monomer (I-24) were used as monomers and mixed in a molar ratio of 38:24:38 [acetoxystyrene:monomer (a1-1-3):monomer (I-24)]. This monomer mixture was then mixed with methyl isobutyl ketone in an amount 1.5 times the total mass of all monomers. Azobisisobutyronitrile and azobis(2,4-dimethylvaleronitrile) were added as initiators to the resulting mixture, at 2.1 mol% and 6.3 mol%, respectively, based on the total monomer amount. Polymerization was carried out by heating at 73°C for approximately 5 hours. A 25% aqueous solution of tetramethylammonium hydroxide was then added to the polymerization reaction mixture, which was stirred for 12 hours and then separated. The resulting organic layer was poured into a large amount of n-heptane to precipitate a resin. The resin was then filtered and recovered, yielding a polymer with a weight-average molecular weight of approximately 5.6 x 10. 3 Resin A5 (copolymer) having the following structural units was obtained in a yield of 58%. TIFF0007742222000151.tif44110

[0244] Example 11 [Synthesis of Resin A6] Acetoxystyrene, monomer (a1-2-6), and monomer (IA-26a) were used as monomers and mixed in a molar ratio of 38:38:24 [acetoxystyrene:monomer (a1-2-6):monomer (IA-26a)]. This monomer mixture was then mixed with methyl isobutyl ketone in an amount 1.5 times the total mass of all monomers. Azobisisobutyronitrile and azobis(2,4-dimethylvaleronitrile) were added as initiators to the resulting mixture, at 2.1 mol% and 6.3 mol%, respectively, based on the total monomer amount. Polymerization was carried out by heating at 73°C for approximately 5 hours. A 25% aqueous solution of tetramethylammonium hydroxide was then added to the polymerization reaction mixture, which was stirred for 12 hours and then separated. The resulting organic layer was poured into a large amount of n-heptane to precipitate a resin. The resin was then filtered and recovered, yielding a polymer with a weight-average molecular weight of approximately 5.4 x 10. 3Resin A6 (copolymer) having the following structural units was obtained in a yield of 83%. TIFF0007742222000152.tif43110

[0245] Example 12 [Synthesis of Resin A7] Acetoxystyrene, monomer (a1-2-6), and monomer (IA-27) were used as monomers and mixed in a molar ratio of 38:38:24 [acetoxystyrene:monomer (a1-2-6):monomer (IA-27)]. This monomer mixture was then mixed with methyl isobutyl ketone in an amount 1.5 times the total mass of all monomers. Azobisisobutyronitrile and azobis(2,4-dimethylvaleronitrile) were added as initiators to the resulting mixture, at 2.1 mol% and 6.3 mol%, respectively, based on the total monomer amount. Polymerization was carried out by heating at 73°C for approximately 5 hours. A 25% aqueous solution of tetramethylammonium hydroxide was then added to the polymerization reaction mixture, which was stirred for 12 hours and then separated. The resulting organic layer was poured into a large amount of n-heptane to precipitate a resin. The resin was then filtered and recovered, yielding a polymer with a weight-average molecular weight of approximately 5.3 x 10. 3 Resin A7 (copolymer) having the following structural units was obtained in a yield of 77%. TIFF0007742222000153.tif49110

[0246] Example 13 [Synthesis of Resin A8] The monomers used were acetoxystyrene, monomer (a1-1-3), monomer (a1-2-6), monomer (a1-0-1), monomer (a2-1-3), monomer (a3-4-2), and monomer (I-6). The molar ratio of acetoxystyrene:monomer (a1-1-3):monomer (a1-2-6):monomer (a1-0-1):monomer (a2-1-3):monomer (a3-4-2):monomer (I-6) was 38:6:9:22:1.5:17.5:6. This monomer mixture was then mixed with 1.5 times the total mass of all monomers. Azobisisobutyronitrile and azobis(2,4-dimethylvaleronitrile) were added as initiators at 2.1 mol% and 6.3 mol%, respectively, relative to the total monomer mass. The mixture was then heated at 73°C for approximately 5 hours to polymerize. After that, a 25% aqueous solution of tetramethylammonium hydroxide was added to the polymerization reaction solution, and after stirring for 12 hours, the layers were separated. The resulting organic layer was poured into a large amount of n-heptane to precipitate a resin, which was then filtered and recovered to give a resin with a weight-average molecular weight of approximately 5.6 × 10 3 Resin A8 (copolymer) having the following structural units was obtained in a yield of 61%. TIFF0007742222000154.tif37166

[0247] Example 14 [Synthesis of Resin A9] Acetoxystyrene, monomer (a1-2-6), and monomer (I-5) were used as monomers and mixed in a molar ratio of 38:38:24 [acetoxystyrene:monomer (a1-2-6):monomer (I-5)]. This monomer mixture was then mixed with methyl isobutyl ketone in an amount 1.5 times the total mass of all monomers. Azobisisobutyronitrile and azobis(2,4-dimethylvaleronitrile) were added as initiators to the resulting mixture, at 2.1 mol% and 6.3 mol%, respectively, based on the total monomer amount. Polymerization was carried out by heating at 73°C for approximately 5 hours. A 25% aqueous solution of tetramethylammonium hydroxide was then added to the polymerization reaction mixture, which was stirred for 12 hours and then separated. The resulting organic layer was poured into a large amount of n-heptane to precipitate a resin. The resin was then filtered and recovered, yielding a polymer with a weight-average molecular weight of approximately 5.5 x 10. 3 Resin A9 (copolymer) having the following structural units was obtained in a yield of 93%. TIFF0007742222000155.tif23110

[0248] Example 15 [Synthesis of Resin A10] Acetoxystyrene, monomer (a1-2-6), and monomer (IA-30) were used as monomers and mixed in a molar ratio of 38:38:24 [acetoxystyrene:monomer (a1-2-6):monomer (IA-30)]. This monomer mixture was then mixed with methyl isobutyl ketone in an amount 1.5 times the total mass of all monomers. Azobisisobutyronitrile and azobis(2,4-dimethylvaleronitrile) were added as initiators to the resulting mixture, at 2.1 mol% and 6.3 mol%, respectively, based on the total monomer amount. Polymerization was carried out by heating at 73°C for approximately 5 hours. A 25% aqueous solution of tetramethylammonium hydroxide was then added to the polymerization reaction mixture, which was stirred for 12 hours and then separated. The resulting organic layer was poured into a large amount of n-heptane to precipitate a resin. The resin was then filtered and recovered, yielding a polymer with a weight-average molecular weight of approximately 5.2 x 10. 3 Resin A10 (copolymer) having the following structural units was obtained in a yield of 75%. TIFF0007742222000156.tif54113

[0249] Example 16 [Synthesis of Resin A11] The monomers used were acetoxystyrene, monomer (a1-2-6), and monomer (IA-33a). They were mixed in a molar ratio of 38:38:24 [acetoxystyrene:monomer (a1-2-6):monomer (IA-33a)]. This monomer mixture was then mixed with methyl isobutyl ketone in an amount 1.5 times the total mass of all monomers. Azobisisobutyronitrile and azobis(2,4-dimethylvaleronitrile) were added as initiators to the resulting mixture, at 2.1 mol% and 6.3 mol%, respectively, based on the total monomer amount. The mixture was heated at 73°C for approximately 5 hours to polymerize the product. A 25% aqueous solution of tetramethylammonium hydroxide was then added to the polymerization reaction mixture, which was stirred for 12 hours and then separated. The resulting organic layer was poured into a large amount of n-heptane to precipitate a resin. The resin was then filtered and recovered, yielding a polymer with a weight-average molecular weight of approximately 5.4 x 10. 3 Resin A11 (copolymer) having the following structural units was obtained in a yield of 68%. TIFF0007742222000157.tif54113

[0250] Example 17 [Synthesis of Resin A12] Acetoxystyrene, monomer (a1-2-6), and monomer (IA-34) were used as monomers and mixed in a molar ratio of 38:38:24 [acetoxystyrene:monomer (a1-2-6):monomer (IA-34)]. This monomer mixture was then mixed with methyl isobutyl ketone in an amount 1.5 times the total mass of all monomers. Azobisisobutyronitrile and azobis(2,4-dimethylvaleronitrile) were added as initiators to the resulting mixture, at 2.1 mol% and 6.3 mol%, respectively, based on the total monomer amount. Polymerization was carried out by heating at 73°C for approximately 5 hours. A 25% aqueous solution of tetramethylammonium hydroxide was then added to the polymerization reaction mixture, which was stirred for 12 hours and then separated. The resulting organic layer was poured into a large amount of n-heptane to precipitate a resin. The resin was then filtered and recovered, yielding a polymer with a weight-average molecular weight of approximately 5.6 x 10. 3 Resin A12 (copolymer) having the following structural units was obtained in a yield of 69%. TIFF0007742222000158.tif62113

[0251] Synthesis Example 5 [Synthesis of Resin AX1] Acetoxystyrene and Monomer (IX-1) were used as monomers and mixed at a molar ratio of 38:62 [acetoxystyrene:monomer (IX-1)]. Furthermore, methyl isobutyl ketone was added to this monomer mixture in an amount of 1.5 times the total mass of all monomers. Azobisisobutyronitrile and azobis(2,4-dimethylvaleronitrile) were added as initiators to the resulting mixture in amounts of 2.1 mol% and 6.3 mol%, respectively, based on the total monomer amount. Polymerization was carried out by heating at 73°C for approximately 5 hours. Subsequently, a 25% aqueous solution of tetramethylammonium hydroxide was added to the polymerization reaction solution, which was stirred for 12 hours and then separated. The resulting organic layer was poured into a large amount of n-heptane to precipitate a resin. The resin was then filtered and recovered, yielding a polymer with a weight-average molecular weight of approximately 5.4 x 10. 3 Resin AX1 (copolymer) having the following structural units was obtained in a yield of 68%. TIFF0007742222000159.tif3187

[0252] Synthesis Example 6 [Synthesis of Resin AX2] Acetoxystyrene and Monomer (IX-2) were used as monomers and mixed at a molar ratio of 38:62 [acetoxystyrene:monomer (IX-2)]. This monomer mixture was then mixed with methyl isobutyl ketone in an amount 1.5 times the total mass of all monomers. Azobisisobutyronitrile and azobis(2,4-dimethylvaleronitrile) were added as initiators to the resulting mixture, at 2.1 mol% and 6.3 mol%, respectively, based on the total monomer amount. Polymerization was carried out by heating at 73°C for approximately 5 hours. A 25% aqueous solution of tetramethylammonium hydroxide was then added to the polymerization reaction mixture, which was stirred for 12 hours and then separated. The resulting organic layer was poured into a large amount of n-heptane to precipitate a resin. The resin was then filtered and recovered, yielding a polymer with a weight-average molecular weight of approximately 5.4 x 10. 3 Resin AX2 (copolymer) was obtained in a yield of 82%. This resin AX2 has the following structural units. TIFF0007742222000160.tif3087

[0253] Synthesis Example 7 [Synthesis of Resin AX3] Monomers (a1-1-3), (a1-2-6), (a1-0-1), (a2-1-3), (a3-4-2), and (I-6) were mixed in a molar ratio of 10:14:35:2.5:28.5:10 (monomer (a1-1-3):monomer (a1-2-6):monomer (a1-0-1):monomer (a2-1-3):monomer (a3-4-2):monomer (I-6)). A 1.5-fold increase in the total monomer mass of propylene glycol monomethyl ether acetate was added to form a solution. Azobisisobutyronitrile and azobis(2,4-dimethylvaleronitrile) were added as initiators at 1 mol% and 3 mol%, respectively, relative to the total monomer mass. The mixture was heated at 75°C for approximately 5 hours. The resulting reaction mixture was poured into a large amount of a methanol / water mixed solvent to precipitate a resin, which was then filtered. The resulting resin was added to a methanol / water mixed solvent, repulped, and filtered. This purification procedure was repeated twice to obtain a resin with a weight-average molecular weight of 8.2 × 10 3 Resin AX3 was obtained in a yield of 65%. This resin AX3 has the following structural units. TIFF0007742222000161.tif40163

[0254] <Preparation of Resist Composition> The components shown in Table 1 were mixed and dissolved to obtain a mixture, which was then filtered through a fluororesin filter with a pore size of 0.2 μm to prepare a resist composition. [Table 1]

[0255] <Resin> A1 to A12, AX1 to AX3: Resin A1 to Resin A12, Resin AX1 to Resin AX3 <Acid generator (B)> B1-25: Salt represented by formula (B1-25); synthesized by the method described in JP 2011-126869 A TIFF0007742222000163.tif2667<Quencher (C)> (Salts that generate acids that are weaker in acidity than the acid generated by acid generators) D1: Synthesized by the method described in JP-A 2011-39502 TIFF0007742222000164.tif3647<solvent> Propylene glycol monomethyl ether acetate 400 parts Propylene glycol monomethyl ether 150 parts γ-butyrolactone 5 parts

[0256] (Electron beam exposure evaluation of resist composition) A 6-inch silicon wafer was treated with hexamethyldisilazane on a direct hot plate at 90°C for 60 seconds. The resist composition was spin-coated onto this silicon wafer so that the composition layer had a thickness of 0.04 μm. The wafer was then pre-baked on a direct hot plate at the temperature shown in the "PB" column in Table 1 for 60 seconds to form a composition layer. A line and space pattern was directly written onto the composition layer formed on the wafer using an electron beam lithography machine ("HL-800D 50 keV" manufactured by Hitachi, Ltd.) by gradually changing the exposure dose. After exposure, post-exposure baking was performed on a hot plate at the temperature shown in the "PEB" column in Table 1 for 60 seconds, and then puddle development was performed in a 2.38 mass % aqueous solution of tetramethylammonium hydroxide for 60 seconds to obtain a resist pattern. The resulting resist pattern (line and space pattern) was observed under a scanning electron microscope, and the exposure amount at which the line width and space width of the 60 nm line and space pattern became 1:1 was taken as the effective sensitivity.

[0257] Line edge roughness evaluation (LER): The fluctuation of the unevenness of the sidewall surface of the resist pattern produced at the effective sensitivity was measured using a scanning electron microscope to determine the line edge roughness. The results are shown in Table 2. [Table 2] Compared with the comparative compositions 1 to 3, the compositions 1 to 12 had good line edge roughness (LER). [Industrial Applicability]

[0258] A resist composition containing the resin of the present invention is capable of obtaining a resist pattern with good line edge roughness (LER), and is therefore suitable for semiconductor microfabrication and extremely useful industrially.

Claims

1. consisting only of structural units represented by formula (I) and structural units represented by formula (a2-A), The structural unit represented by the formula (I) is 20 to 70 mol %; A resin in which the structural units represented by the formula (a2-A) are selected from 10 to 50 mol % and the total content of the structural units is 100 mol %, or The polymerizable composition comprises a structural unit represented by formula (I), a structural unit represented by formula (a2-A), and at least one structural unit selected from the group consisting of formulas (a1-0), (a1-1), (a1-2), (a2-1), and (a3-4), The structural unit represented by the formula (I) is 3 to 70 mol %; The structural unit represented by the formula (a2-A) is 10 to 50 mol %, the total amount of the structural units represented by the formulas (a1-0), (a1-1) and (a1-2) is 10 to 70 mol %, The structural unit represented by the formula (a2-1) is 1 to 10 mol %; a resin in which the structural units represented by formula (a3-4) are selected from 5 to 60 mol % and the total content of the structural units is 100 mol %; A resist composition for electron beam exposure or EUV exposure, comprising an acid generator. [In formula (I), R 1 represents an alkyl group having 1 to 6 carbon atoms which may have one or more halogen atoms, a hydrogen atom, or a halogen atom. X １ is the formula (X １ -2) ~Formula (X １ -7). (Formula (X １ -2)~Formula(X １ -7) Middle, * and ** are bonds, and * is -R １ represents a bond to the carbon atom to which it is bonded, and ** represents A １ represents a bond with .) A 1 is a single bond or *-A 2 represents —CO—O—. * represents X １ represents the binding site with A 2 represents an alkanediyl group having 1 to 6 carbon atoms. R ２ and R ３ each independently represents a saturated hydrocarbon group having 1 to 6 carbon atoms. X ａ and X ｂ each independently represents —O— or —S—. X １１ represents a divalent saturated hydrocarbon group having 1 to 12 carbon atoms which may contain a fluorine atom. L １ represents a single bond or a hydrocarbon group having 1 to 28 carbon atoms which may have a substituent, and —CH 2 - is -O-, -S-, -SO ２ It may be replaced by - or -CO-. R ４ represents a hydrocarbon group having 1 to 36 carbon atoms which may have a substituent, and —CH 2 - is -O-, -S-, -CO- or -SO ２ - may be replaced by . [In formula (a2-A), R a50 represents a hydrogen atom, a halogen atom or an alkyl group having 1 to 6 carbon atoms which may have a halogen atom. R a51 represents 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, or an alkylcarbonyloxy group having 2 to 4 carbon atoms. A a50 is a single bond or *-X a51 - (A a52 -X a52 ) nｂ -, * represents -R a50 represents the bonding site with the carbon atom to which it is bonded. A a52 represents an alkanediyl group having 1 to 6 carbon atoms. X a51 and X a52 each independently represents —O—, —CO—O—, or —O—CO—. nb represents 0 or 1. mb represents an integer of 0 to 4; When mb is an integer of 2 or more, a plurality of R a51 may be the same or different.] [In formula (a1-0), formula (a1-1) and formula (a1-2), L a01 , L ａ１ and L ａ２ are each independently —O— or *—O—(CH ２ ) ｋ１ represents —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 or a methyl group. 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. 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. m1 represents an integer of 0 to 14. n1 represents an integer of 0 to 10. n1′ represents an integer of 0 to 3.] [In formula (a2-1), L a3 is -O- or *-O-(CH 2 ) k2 represents —CO—O—, and k2 represents an integer of 1 to 7. * represents the bonding position with —CO—. R a14 represents a hydrogen atom or a methyl group. R a15 and R a16 each independently represents a hydrogen atom, a methyl group, or a hydroxy group. o1 represents an integer of 0 to 10. [In formula (a3-4), 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 represents -O-. L ａ８ and L ａ９ each independently represents an alkanediyl group having 1 to 6 carbon atoms. * indicates the bonding site with the carbonyl group. R ａ２４ represents an alkyl group having 1 to 6 carbon atoms which may have one or more halogen atoms, a hydrogen atom, or a halogen atom. R ａ２５ represents a carboxy group, a cyano group, or an aliphatic hydrocarbon group having 1 to 4 carbon atoms. w1 represents an integer of 0 to 8. When w1 is 2 or more, a plurality of R ａ２５ may be the same or different.

2. L １ In the formula, -CH 2 - is -O-, -S-, -SO ２ 2. The resist composition according to claim 1, wherein the alkanediyl group has 1 to 6 carbon atoms and may be substituted with -- or --CO--.

3. X ａ and X ｂ 3. The resist composition according to claim 1, wherein is —O—.

4. X １１ 4. The resist composition according to claim 1, wherein is a divalent saturated hydrocarbon group having 2 to 6 carbon atoms which may contain a fluorine atom.

5. 5. The resist composition according to claim 1, which comprises a structural unit represented by formula (a1-1) or a structural unit represented by formula (a1-2).

6. 6. The resist composition according to claim 1, wherein the acid generator comprises a salt represented by formula (B1). [In formula (B1), Q b1 and Q b2 each independently represents a fluorine atom or a perfluoroalkyl group having 1 to 6 carbon atoms. L b1 represents a divalent saturated hydrocarbon group having 1 to 24 carbon atoms, and —CH ２ The - may be replaced by -O- or -CO-, and the hydrogen atom contained in the divalent saturated hydrocarbon group may be substituted by a fluorine atom or a hydroxy group. Y represents an optionally substituted methyl group or an optionally substituted alicyclic hydrocarbon group having 3 to 24 carbon atoms, and —CH ２ - is -O-, -S(O) ２ It may be replaced by - or -CO-. Z ＋ represents an organic cation.

7. 7. The resist composition according to claim 1, further comprising a salt that generates an acid that is weaker in acidity than the acid generated from the acid generator.

8. (1) a step of applying the resist composition according to any one of claims 1 to 7 onto a substrate; (2) a step of drying the applied composition to form a composition layer; (3) exposing the composition layer to light; (4) a step of heating the composition layer after exposure; and (5) developing the composition layer after heating; A method for producing a resist pattern comprising:

Images