Carboxylic acid salt, carboxylic acid generator, resist composition and method for producing resist pattern

Abstract

To provide carboxylate, a carboxylic acid generator including the carboxylate and a resist composition including the generator from which a resist pattern having an excellent line edge roughness (LER) can be produced.SOLUTION: Provided is carboxylate expressed by and synthesized as in a formula (I-2), for instance.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a carboxylate, a carboxylic acid generator, a resist composition, and a method for producing a resist pattern. [Background technology]

[0002] Patent Document 1 describes a resist composition that contains a carboxylate represented by the following formula as a carboxylic acid generator. TIFF0007659418000001.tif2642 Patent Document 2 describes a resist composition that contains a salt represented by the following formula as an acid generator. TIFF0007659418000002.tif2788 Patent Document 3 describes a resist composition that contains a salt represented by the following formula as an acid generator. TIFF0007659418000003.tif2892 [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2011-039502 A [Patent Document 2] JP 2011-085878 A [Patent Document 3] JP 2020-015713 A Summary of the Invention [Problem to be solved by the invention]

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

[0005] The present invention includes the following inventions. [1] A carboxylate represented by formula (I). TIFF0007659418000004.tif7298[In formula (I), R 1 , R 2 and R 3 are each independently: -OR 10 , -O-CO-R 10 , -O-CO-OR 10 , -OL 1 -CO-OR 10 Represents. L 1 represents an alkanediyl group having 1 to 6 carbon atoms. R 4 , R 5 , R 6 , R 7 , R 8 and R 9 each independently represents a halogen atom, a fluorinated alkyl group having 1 to 6 carbon atoms, or a hydrocarbon group having 1 to 18 carbon atoms, the hydrocarbon group optionally having a substituent, and -CH 2 - is -O-, -CO-, -SO 2 It may be replaced by - or -S-. R 10 represents a group having a lactone structure. 1 , X 2 and X 3 each independently represents an oxygen atom or a sulfur atom. m1 represents an integer of any one of 1 to 5, and when m1 is 2 or more, the groups in multiple parentheses may be the same or different. m2 represents an integer of 0 to 5, and when m2 is 2 or greater, the groups in multiple parentheses may be the same or different. m3 represents an integer of 0 to 5, and when m3 is 2 or more, the groups in the parentheses may be the same or different. When m2 and m3 are 1 or more, the groups in the parentheses may be the same or different. 10 may be the same or different from each other. m4 represents an integer of 0 to 4, and when m4 is 2 or more, a plurality of R 4 may be the same or different from each other. m5 represents an integer of 0 to 4, and when m5 is 2 or more, a plurality of R 5 may be the same or different from each other. m6 represents an integer of 0 to 4, and when m6 is 2 or more, a plurality of R 6 may be the same or different from each other. m7 represents an integer of 0 to 4, and when m7 is 2 or more, a plurality of R 7 may be the same or different from each other. m8 represents an integer of 0 to 5, and when m8 is 2 or more, a plurality of R 8 may be the same or different from each other. m9 represents an integer of 0 to 5, and when m9 is 2 or more, a plurality of R 9 may be the same or different from each other. However, 1≦m1+m7≦5, 0≦m2+m8≦5, and 0≦m3+m9≦5. X 0 represents a hydrocarbon group having 1 to 72 carbon atoms which may have a substituent, and -CH 2 - is -O-, -S-, -CO- or -SO 2 - may be replaced.] [2]X 1 , X 2 and X 3 [1] The carboxylate according to claim 1, wherein [3] R 10 The group having a lactone structure represented by the formula (R 10 -1), formula (R 10 -2) or formula (R 10 The carboxylate according to [1] or [2], wherein the carboxylate is a group having a lactone ring group represented by the formula (3). TIFF0007659418000005.tif34121[Formula(R 10 -1)~Formula(R 10 -3) Medium, * represents a bond. Z 12 represents an oxygen atom, a sulfur atom, or a methylene group. R 11 , R 12 and R 13each independently represents a halogen atom, a fluorinated alkyl group having 1 to 6 carbon atoms, or a hydrocarbon group having 1 to 18 carbon atoms, and -CH 2 - may be replaced by -O-, -CO- or -S-. m11 represents an integer of 0 to 5, and when m11 is 2 or more, a plurality of R 11 may be the same or different from each other. m12 represents an integer of 0 to 5, and when m12 is 2 or more, a plurality of R 12 may be the same or different from each other. m13 represents an integer of 0 to 5, and when m13 is 2 or more, a plurality of R 13 may be the same or different from each other. n10 represents an integer of 1 to 3. [4]X 0 an aliphatic hydrocarbon group having 1 to 72 carbon atoms which may have a substituent (provided that the -CH 2 - is -O-, -S-, -CO- or -SO 2 - which may be substituted with -; or an aromatic hydrocarbon group having 6 to 36 carbon atoms which may have a substituent. [5]X 0 is an alicyclic hydrocarbon group having 3 to 36 carbon atoms which may have a fluorine atom or a hydroxyl group (the —CH 2 The carboxylate according to any one of [1] to [4], wherein - may be replaced by -O- or -CO-, or a phenyl group which may have a halogen atom, a hydroxyl group or a perfluoroalkyl group having 1 to 4 carbon atoms. [6]X 0 is a group represented by formula (aa): TIFF0007659418000006.tif2737[In formula (aa), X a and X b each independently represents -O- or -S-. X 1arepresents a hydrocarbon group having 1 to 24 carbon atoms which may have a substituent, and -CH 2 - is -O-, -S-, -CO- or -SO 2 - may be replaced. X 2a represents a hydrocarbon group having 1 to 48 carbon atoms which may have a substituent, and -CH 2 - is -O-, -S-, -CO- or -SO 2 - may be replaced. * -COO - represents the bond position with the carbon atom of [7]X 0 is a halogen atom, a hydroxyl group, or an aromatic hydrocarbon group having 6 to 36 carbon atoms and having a perfluoroalkyl group having 1 to 4 carbon atoms. [8]X 0 is a group represented by formula (aa): TIFF0007659418000007.tif2451[In formula (bb), L A represents an alkanediyl group having 1 to 6 carbon atoms which may have a fluorine atom, or an aromatic hydrocarbon group having 6 carbon atoms which may have a halogen atom or a perfluoroalkyl group having 1 to 4 carbon atoms. L B represents a single bond or an alkanediyl group having 1 to 6 carbon atoms, and the -CH 2 - is -O-, -S-, -CO- or -SO 2 - may be replaced. R A 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. * -COO - represents the bond position with the carbon atom of [9] A carboxylic acid generator comprising the carboxylate according to any one of [1] to [8].

[10] A resist composition comprising the carboxylic acid generator according to [9], an acid generator other than the carboxylic acid generator, and a resin having an acid labile group.

[11] The resist composition according to

[10] , wherein the resin having an acid labile group comprises 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): TIFF0007659418000008.tif46102 [In formula (a1-1) and formula (a1-2), 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 position with --CO--. R a4 and R a5 each independently represents a hydrogen atom, a halogen atom or an alkyl group having 1 to 6 carbon atoms which may have a halogen atom. R 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.

[12] The resist composition according to

[10] or

[11] , further comprising a resin containing a structural unit having a fluorine atom.

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

[10] to

[12] onto a substrate; (2) A step of 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. Effect of the Invention

[0006] By using a resist composition that uses a carboxylate of the present invention, a resist pattern with excellent line edge roughness (LER) can be produced. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0007] In this specification, the term "(meth)acrylic monomer" refers to a compound represented by "CH 2 Monomers with the structure =CH-CO- and "CH 2 =C(CH 3 (Meth)acrylate" and "(meth)acrylic acid" respectively mean "at least one selected from the group consisting of acrylates and methacrylates" and "at least one selected from the group consisting of acrylic acid and methacrylic acid". 2 =C(CH 3 )-CO-" or "CH 2 When a structural unit having "=CH-CO-" is exemplified, a structural unit having both groups is also exemplified. In addition, in the groups described in this specification, those that can have both a straight chain structure and a branched structure may have either structure. -CH contained in a hydrocarbon group, etc. 2 - is -O-, -S-, -CO- or -SO 2 When replaced with -, the same examples apply to each group. A "combined group" refers to a group in which two or more of the exemplified groups are combined, and the valence of the groups may be appropriately changed depending on the bonding form. "Derived from" or "derived from" refers to a polymerizable C=C bond contained in the molecule that becomes a -CC- group by polymerization. When stereoisomers exist, all stereoisomers are included. In this specification, the term "solids content of a resist composition" refers to the sum of the components excluding the solvent (E), which will be described later, from the total amount of the resist composition.

[0008] [Salt represented by formula (I)] The present invention relates to a carboxylate represented by formula (I) (hereinafter sometimes referred to as "salt (I)"). In salt (I), the negatively charged side is sometimes called the "anion (I)" and the positively charged side is sometimes called the "cation (I)". TIFF0007659418000009.tif84118 [wherein all symbols have the same meanings as defined above.]

[0009] In formula (I), R 1 , R 2 and R 3 L included in 1 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, a butane-1,4-diyl group, a pentane-1,5-diyl group, and a hexane-1,6-diyl group; and Examples of branched alkanediyl groups include ethane-1,1-diyl group, propane-1,1-diyl group, propane-1,2-diyl group, propane-2,2-diyl group, pentane-2,4-diyl group, 2-methylpropane-1,3-diyl group, 2-methylpropane-1,2-diyl group, pentane-1,4-diyl group, and 2-methylbutane-1,4-diyl group. L 1 is preferably an alkanediyl group having 1 to 3 carbon atoms, and more preferably a methylene group.

[0010] R 1 , R 2 and R 3 R included in 10represents a group having a lactone structure. The lactone structure refers to a structure obtained by removing one or more hydrogen atoms bonded to the atomic group constituting the lactone ring. The lactone ring is a cyclic ester, and is a ring containing -CO-O- as an atomic group constituting the ring. The lactone structure may contain a heteroatom other than -CO-O- as an atomic group constituting the ring, and the hydrogen atom bonded to the atomic group constituting the lactone ring may be replaced with a substituent. The lactone ring may be a monocyclic ring such as a β-propiolactone ring, a γ-butyrolactone ring, or a δ-valerolactone ring, or may be a condensed ring of a monocyclic lactone ring and another ring. Among these lactone rings, a γ-butyrolactone ring, an adamantanelactone ring, and a condensed ring of a γ-butyrolactone ring and another ring are preferred because they facilitate the production of the salt (I) described below.

[0011] The lactone ring corresponding to the structure before the hydrogen atom is removed in the lactone structure includes lactone rings having 3 to 18 carbon atoms, and more specifically, the compounds represented by formula (R-1), formula (R-2), formula (R-3), formula (R-4), formula (R-5), formula (R-6), formula (R-7) and formula (R-8) can be mentioned. In addition, like the compound represented by formula (R-3) or formula (R-8), the atomic group constituting the ring may contain a heteroatom other than -CO-O-. In addition, the hydrogen atom contained in the lactone ring may be replaced by a substituent. TIFF0007659418000010.tif31161 The lactone ring is preferably a lactone ring represented by formula (R-1), formula (R-2), formula (R-3) or formula (R-6).

[0012] R 10 The group having a lactone structure represented by the formula (R 10 -1), formula (R 10 -2) or formula (R 10 A group having a lactone ring group represented by the formula (3) is preferred. TIFF0007659418000011.tif34119[Formula(R 10 -1)~Formula(R 10 -3) Medium, * represents a bond. Z 12 represents an oxygen atom, a sulfur atom, or a methylene group. R 11 , R 12 and R 13 each independently represents a halogen atom, a fluorinated alkyl group having 1 to 6 carbon atoms, or a hydrocarbon group having 1 to 18 carbon atoms, and -CH 2 - may be replaced by -O- or -CO-. m11 represents an integer of 0 to 5, and when m11 is 2 or more, a plurality of R 11 may be the same or different from each other. m12 represents an integer of 0 to 5, and when m12 is 2 or more, a plurality of R 12 may be the same or different from each other. m13 represents an integer of 0 to 5, and when m13 is 2 or more, a plurality of R 13 may be the same or different from each other. n10 represents an integer of 1 to 3.

[0013] R 11 , R 12 and R 13 Examples of the halogen atom include a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom. R 11 , R 12 and R 13 The fluorinated alkyl group having 1 to 6 carbon atoms refers to an alkyl group having 1 to 6 carbon atoms and containing a fluorine atom, and examples thereof include perfluoroalkyl groups having 1 to 6 carbon atoms (trifluoromethyl group, pentafluoroethyl group, heptafluoropropyl group, nonafluorobutyl group), as well as a 2,2,2-trifluoroethyl group, a 3,3,3-trifluoropropyl group, a 4,4,4-trifluorobutyl group, and a 3,3,4,4,4-pentafluorobutyl group. R 11 , R 12 and R 13 Examples of the hydrocarbon group having 1 to 18 carbon atoms include chain hydrocarbon groups such as alkyl groups, 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, a pentyl group, a hexyl group, a heptyl group, a 2-ethylhexyl group, an octyl group, a nonyl group, a decyl group, an undecyl group, and a dodecyl group, etc. The number of carbon atoms in the alkyl group is preferably 1 to 12, more preferably 1 to 9, further preferably 1 to 6, and even more preferably 1 to 4. The alicyclic hydrocarbon group may be either monocyclic or polycyclic, and examples thereof include the groups shown below. The bonding site may be any position. TIFF0007659418000012.tif41165Specifically, examples of the monocyclic alicyclic hydrocarbon group include cycloalkyl groups such as a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cyclooctyl group, and a cyclodecyl group. Examples of the polycyclic alicyclic hydrocarbon group include a decahydronaphthyl group, an adamantyl group, and a norbornyl group. 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. Examples of the aromatic hydrocarbon group include a phenyl group, a naphthyl group, a biphenyl group, an anthryl group, a phenanthryl group, a binaphthyl group, etc. The number of carbon atoms in the aromatic hydrocarbon group is preferably 6 to 18, more preferably 6 to 14, and further preferably 6 to 10.

[0014] Groups formed by combination include groups that combine an aromatic hydrocarbon group with a chain hydrocarbon group (e.g., aromatic hydrocarbon group-alkanediyl group-*, alkyl group-aromatic hydrocarbon group-*), groups that combine an alicyclic hydrocarbon group with a chain hydrocarbon group (e.g., alicyclic hydrocarbon group-alkanediyl group-*, alkyl group-alicyclic hydrocarbon group-*), and groups that combine 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 a cyclohexylmethyl group, a cyclohexylethyl group, a 1-(adamantan-1-yl)methyl group, and a 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 aromatic hydrocarbon group-alicyclic hydrocarbon group-* include a phenylcyclohexyl group. Examples of the alicyclic hydrocarbon group-aromatic hydrocarbon group-* include a cyclohexylphenyl group. In addition, in the combination, two or more of each of the alicyclic hydrocarbon group, aromatic hydrocarbon group, and chain hydrocarbon group may be combined. In addition, the -CH 2 - is -O-, -S-, -CO- or -SO 2 In the combined groups, either group may be bonded to the benzene ring. -CH contained in the hydrocarbon group 2 -, -O-, -CO-, -SO 2 The group substituted for - or -S- is a hydroxy group (-CH 2 - is replaced by -O-), carboxy group (-CH contained in ethyl group) 2 -CH 2 - is replaced by -O-CO-), thiol group (-CH 2 - is replaced by -S-), alkoxy group (-CH 2 - is replaced by -O-), alkoxycarbonyl group (-CH2 -CH 2 - is replaced by -O-CO-), alkylthio group (-CH 2 - is replaced by -S-), alkylcarbonyl group (-CH 2 - is replaced by -CO-), alkylcarbonyloxy group (-CH 2 -CH 2 - is replaced by -CO-O-), alkylsulfonyl group (-CH 2 -But-SO 2 -substituted), a cycloalkoxy group, a cycloalkylalkoxy group, an alkoxycarbonyloxy group, an aromatic hydrocarbon group-carbonyloxy group, and a group in which two or more of these groups are combined. The alkoxy group includes an alkoxy group 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, an undecyloxy group, etc. The number of carbon atoms in the alkoxy group is preferably 1 to 11, more preferably 1 to 6, and further preferably 1 to 4. The alkoxycarbonyl group, alkylcarbonyl group and alkylcarbonyloxy group 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 include alkoxycarbonyl groups having 2 to 17 carbon atoms, such as methoxycarbonyl, ethoxycarbonyl, and butoxycarbonyl groups. Examples of the alkylthio group include alkylthio groups having 1 to 17 carbon atoms, such as methylthio, ethylthio, and propylthio groups. Examples of the alkylcarbonyl group include alkylcarbonyl groups having 2 to 18 carbon atoms, such as acetyl, propionyl, and butyryl groups. Examples of the alkylcarbonyloxy group include alkylcarbonyloxy groups having 2 to 17 carbon atoms, such as acetyloxy, propionyloxy, and butyryloxy groups. The number of carbon atoms in the alkoxycarbonyl group is preferably 2 to 11, more preferably 2 to 6, and even more preferably 2 to 4. The number of carbon atoms in the alkylcarbonyl group is preferably 2 to 12, more preferably 2 to 6, and even more preferably 2 to 4. The alkylcarbonyloxy group preferably has 2 to 11 carbon atoms, more preferably 2 to 6 carbon atoms, and further preferably 2 to 4 carbon atoms. The alkylsulfonyl group includes alkylsulfonyl groups having 1 to 17 carbon atoms, such as a methylsulfonyl group, an ethylsulfonyl group, a propylsulfonyl group, etc. The number of carbon atoms in the alkylsulfonyl group is preferably 1 to 11, more preferably 1 to 6, and further preferably 1 to 4. Examples of the cycloalkoxy group include cycloalkoxy groups having 3 to 17 carbon atoms, such as a cyclohexyloxy group. Examples of the cycloalkylalkoxy group include cycloalkylalkoxy groups having 4 to 17 carbon atoms, such as a cyclohexylmethoxy group. Examples of the alkoxycarbonyloxy group include alkoxycarbonyloxy groups having 2 to 16 carbon atoms, such as a butoxycarbonyloxy group. Examples of the aromatic hydrocarbon group-carbonyloxy group include aromatic hydrocarbon group-carbonyloxy groups having 7 to 17 carbon atoms, such as a benzoyloxy group. In addition, -CH contained in alicyclic hydrocarbon groups 2 -, -O-, -CO-, -SO 2Examples of the group replaced with - or -S- include the groups shown below. In addition, when -O- or -CO- in the group shown below is replaced with -S- or -SO 2 The binding site may be at any position. TIFF0007659418000013.tif46155-CH contained in the hydrocarbon group 2 -, -O-, -CO-, -SO 2 When the hydrocarbon group is substituted with - or -S-, the number of carbon atoms before the substitution is regarded as the total number of carbon atoms in the hydrocarbon group.

[0015] It is preferable that m11, m12, and m13 are 0.

[0016] Formula (R 10 -1), formula (R 10 -2) or formula (R 10 Examples of the group having a lactone ring group represented by -3) include the following groups. TIFF0007659418000014.tif46155R 1 , R 2 and R 3 is -O-CO-R 10 , -O-CO-OR 10 , -OL 1 -CO-OR 10 It is preferable that the formula is -OL 1 -CO-OR 10 It is more preferable that: R 1 , R 2 and R 3 The bond positions of X 1 , X 2 and X 3 The bonding position of X may be either o-position, m-position or p-position. 1 , X 2 and X 3 It is preferable that the bond is at the p-position relative to the bonding position of the above.

[0017] R 4 , R 5 , R6 , R 7 , R 8 and R 9 Examples of the halogen atom include a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom. R 4 , R 5 , R 6 , R 7 , R 8 and R 9 The fluorinated alkyl group having 1 to 6 carbon atoms refers to an alkyl group having 1 to 6 carbon atoms and containing a fluorine atom, and examples thereof include perfluoroalkyl groups having 1 to 6 carbon atoms (trifluoromethyl group, pentafluoroethyl group, heptafluoropropyl group, nonafluorobutyl group), as well as 2,2,2-trifluoroethyl group, 3,3,3-trifluoropropyl group, 4,4,4-trifluorobutyl group, and 3,3,4,4,4-pentafluorobutyl group. The number of carbon atoms in the fluorinated alkyl group is preferably 1 to 6, more preferably 1 to 4, and further preferably 1 to 3. R 4 , R 5 , R 6 , R 7 , R 8 and R 9 Examples of the hydrocarbon group having 1 to 18 carbon atoms include chain hydrocarbon groups such as alkyl groups, 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, a pentyl group, a hexyl group, a heptyl group, a 2-ethylhexyl group, an octyl group, a nonyl group, a decyl group, an undecyl group, and a dodecyl group, etc. The number of carbon atoms in the alkyl group is preferably 1 to 12, more preferably 1 to 9, further preferably 1 to 6, and even more preferably 1 to 4. The alicyclic hydrocarbon group may be either monocyclic or polycyclic, and examples thereof include the groups shown below. The bonding site may be any position. TIFF0007659418000015.tif41165Specifically, examples of the monocyclic alicyclic hydrocarbon group include cycloalkyl groups such as a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cyclooctyl group, and a cyclodecyl group. Examples of the polycyclic alicyclic hydrocarbon group include a decahydronaphthyl group, an adamantyl group, and a norbornyl group. 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. Examples of the aromatic hydrocarbon group include a phenyl group, a naphthyl group, a biphenyl group, an anthryl group, a phenanthryl group, a binaphthyl group, etc. The number of carbon atoms in the aromatic hydrocarbon group is preferably 6 to 18, more preferably 6 to 14, and further preferably 6 to 10.

[0018] The group formed by the combination includes a group formed by combining an aromatic hydrocarbon group with a chain hydrocarbon group (for example, an aromatic hydrocarbon group-alkanediyl group-*, an alkyl group-aromatic hydrocarbon group-*, the -CH 2 - may be replaced by -O-, -CO- or -S-), a group combining an alicyclic hydrocarbon group and a chain hydrocarbon group (for example, an alicyclic hydrocarbon group-alkanediyl group-*, an alkyl group-alicyclic hydrocarbon group-*, the -CH 2 - may be replaced by -O-, -CO- or -S-), and groups combining an aromatic hydrocarbon group and an alicyclic hydrocarbon group (for example, 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 a cyclohexylmethyl group, a cyclohexylethyl group, a 1-(adamantan-1-yl)methyl group, and a 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 aromatic hydrocarbon group-alicyclic hydrocarbon group-* include a phenylcyclohexyl group. Examples of the alicyclic hydrocarbon group-aromatic hydrocarbon group-* include a cyclohexylphenyl group. In addition, in the combination, 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 a benzene ring.

[0019] -CH contained in the hydrocarbon group 2 -, -O-, -CO-, -SO 2 The group substituted for - or -S- is a hydroxy group (-CH 2 - is replaced by -O-), carboxy group (-CH contained in ethyl group) 2 -CH 2 - is replaced by -O-CO-), thiol group (-CH 2 - is replaced by -S-), alkoxy group (-CH 2 - is replaced by -O-), alkoxycarbonyl group (-CH 2 -CH 2 - is replaced by -O-CO-), alkylthio group (a group in which - at any position in an alkyl group is CH 2 - is replaced by -S-), alkylcarbonyl group (-CH 2 - is replaced by -CO-), alkylcarbonyloxy group (-CH2 -CH 2 - is replaced by -CO-O-), alkylsulfonyl group (-CH 2 -But-SO 2 -substituted), a cycloalkoxy group, a cycloalkylalkoxy group, an alkoxycarbonyloxy group, an aromatic hydrocarbon group-carbonyloxy group, and a combination of two or more of these groups. The alkoxy group includes an alkoxy group 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, an undecyloxy group, etc. The number of carbon atoms in the alkoxy group is preferably 1 to 11, more preferably 1 to 6, and further preferably 1 to 4. The alkoxycarbonyl group, alkylcarbonyl group and alkylcarbonyloxy group 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 include alkoxycarbonyl groups having 2 to 17 carbon atoms, such as methoxycarbonyl, ethoxycarbonyl, and butoxycarbonyl groups. Examples of the alkylthio group include alkylthio groups having 1 to 17 carbon atoms, such as methylthio, ethylthio, and propylthio groups. Examples of the alkylcarbonyl group include alkylcarbonyl groups having 2 to 18 carbon atoms, such as acetyl, propionyl, and butyryl groups. Examples of the alkylcarbonyloxy group include alkylcarbonyloxy groups having 2 to 17 carbon atoms, such as acetyloxy, propionyloxy, and butyryloxy groups. The number of carbon atoms in the alkoxycarbonyl group is preferably 2 to 11, more preferably 2 to 6, and even more preferably 2 to 4. The number of carbon atoms in the alkylcarbonyl group is preferably 2 to 12, more preferably 2 to 6, and even more preferably 2 to 4. The alkylcarbonyloxy group preferably has 2 to 11 carbon atoms, more preferably 2 to 6 carbon atoms, and further preferably 2 to 4 carbon atoms. The alkylsulfonyl group includes alkylsulfonyl groups having 1 to 17 carbon atoms, such as a methylsulfonyl group, an ethylsulfonyl group, a propylsulfonyl group, etc. The number of carbon atoms in the alkylsulfonyl group is preferably 1 to 11, more preferably 1 to 6, and further preferably 1 to 4. Examples of the cycloalkoxy group include cycloalkoxy groups having 3 to 17 carbon atoms, such as a cyclohexyloxy group. Examples of the cycloalkylalkoxy group include cycloalkylalkoxy groups having 4 to 17 carbon atoms, such as a cyclohexylmethoxy group. Examples of the alkoxycarbonyloxy group include alkoxycarbonyloxy groups having 2 to 16 carbon atoms, such as a butoxycarbonyloxy group. Examples of the aromatic hydrocarbon group-carbonyloxy group include aromatic hydrocarbon group-carbonyloxy groups having 7 to 17 carbon atoms, such as a benzoyloxy group.

[0020] In addition, -CH contained in alicyclic hydrocarbon groups 2-, -O-, -CO-, -SO 2 Examples of the group replaced with - or -S- include the groups shown below. In the groups shown below, -O- is replaced with -S-, and -CO- is replaced with -SO. 2 The binding site may be at any position. TIFF0007659418000016.tif45156 -CH contained in the hydrocarbon group 2 When - is replaced by -O- or -CO-, the number of carbon atoms before the replacement is regarded as the total number of carbon atoms in the hydrocarbon group. In addition, the number may be 1 or 2 or more.

[0021] R 4 , R 5 , R 6 , R 7 , R 8 and R 9 The substituent that the hydrocarbon group may have is, for example, a halogen atom, a cyano group, an alkyl group having 1 to 12 carbon atoms (including the —CH 2 - may be replaced by -O- or -CO-. Examples of the halogen atom include the same groups as those mentioned above. Examples of the alkyl group having 1 to 12 carbon atoms include the same groups as those mentioned above. As a substituent, -CH contained in an alkyl group 2 When - is replaced by -O-, -S- or -CO-, the number of carbon atoms before the replacement is counted as the total number of carbon atoms in the alkyl group. Examples of the replaced group include a hydroxy group, a carboxy group, an alkoxy group, a thiol group, an alkoxycarbonyl group, an alkylcarbonyl group, an alkylcarbonyloxy group, an alkylthio group, and an alkylsulfonium group. Examples of the alkoxy group, alkoxycarbonyl group, alkylcarbonyl group and alkylcarbonyloxy group include the same groups as those described above. The hydrocarbon group may have one or more substituents.

[0022] X 1 is preferably an oxygen atom. X 2 is preferably an oxygen atom. X 3 is preferably an oxygen atom. X 1 , X 2 and X 3 The bond position of S + The bonding position of S may be either o-position, m-position or p-position. + It is preferably bonded to the p-position or m-position relative to the bonding position of the above, and more preferably bonded to the p-position. m1 is preferably 1 or 2, and more preferably 1. It is preferred that m2 is 0 or 1. m3 is preferably 0 or 1, and more preferably 0. m4 is preferably 0, 1, 2 or 4, and more preferably 0. m5 is preferably 0 or 1, and more preferably 0. m6 is preferably 0 or 1, and more preferably 0. m7 is preferably 0, 1 or 2, and more preferably 0. m8 is preferably 0 or 1, and more preferably 0. When m2 is 0, m8 is preferably 1. m9 is preferably 0 or 1, and more preferably 0. When m3 is 0, m9 is preferably 1. When m1 to m3 are 2 or more, the groups in the parentheses may be the same or different from each other. That is, X 1 ~X 3 When there are multiple of each, R 1 ~R 3 When there are multiple of each, R 4 ~R 6 When there are a plurality of each of them, they may be the same or different. R 4 , R 5 and R 6each independently represents a halogen atom, a fluorinated alkyl group having 1 to 4 carbon atoms, or an alkyl group having 1 to 6 carbon atoms (including —CH 2 - may be replaced by -O- or -CO-.) is preferably a halogen atom, a fluorinated alkyl group having 1 to 4 carbon atoms, or an alkyl group having 1 to 4 carbon atoms (the -CH 2 - may be replaced by -O- or -CO-.) is more preferable, and an alkyl group having 1 to 4 carbon atoms is even more preferable. R 7 , R 8 and R 9 each independently represents a halogen atom, a fluorinated alkyl group having 1 to 4 carbon atoms, or an alkyl group having 1 to 6 carbon atoms (including —CH 2 - may be replaced by -O- or -CO-.) is preferably a halogen atom, a fluorinated alkyl group having 1 to 4 carbon atoms, or an alkyl group having 1 to 4 carbon atoms (the -CH 2 - may be replaced by -O- or -CO-.) is more preferred, and a fluorine atom, an iodine atom, a perfluoroalkyl group having 1 to 4 carbon atoms, or an alkyl group having 1 to 4 carbon atoms (the -CH 2 - may be replaced by -O- or -CO-.) is more preferable, and a fluorine atom, an iodine atom, a trifluoromethyl group, a t-butyl group, a hydroxy group or a methoxy group is even more preferable.

[0023] Examples of the cation of the salt (I) include the cations represented by the following formulae (Ic-1) to (Ic-32). TIFF0007659418000017.tif238139

[0024] TIFF0007659418000018.tif198148

[0025] TIFF0007659418000019.tif232153

[0026] TIFF0007659418000020.tif90148

[0027] In formula (I), X 0 Examples of the hydrocarbon group represented by the formula include aliphatic hydrocarbon groups (chain hydrocarbon groups such as alkyl groups, alkenyl groups, and alkynyl groups, and alicyclic hydrocarbon groups), aromatic hydrocarbon groups, and combinations of these groups. 2 - is -O-, -S-, -CO- or -SO 2 - may be replaced. Examples of the alkyl group include methyl, ethyl, propyl, isopropyl, butyl, isobutyl, tert-butyl, pentyl, hexyl, octyl, nonyl, etc. The number of carbon atoms in the alkyl group is preferably 1 to 18, more preferably 1 to 12, still more preferably 1 to 9, still more preferably 1 to 6, and still more preferably 1 to 4. 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. -CH contained in chain hydrocarbon group 2 - is -O-, -S-, -CO- or -SO 2 The group substituted for - is a hydroxy group (-CH 2 - is replaced by -O-), carboxy group (-CH contained in ethyl group) 2 -CH 2 - is replaced by -O-CO-), thiol group (-CH 2 - is replaced by -S-), alkoxy group (-CH 2- is replaced by -O-), alkoxycarbonyl group (-CH 2 -CH 2 - is replaced by -O-CO-), alkylcarbonyl group (-CH 2 - is replaced by -CO-), alkylsulfonyl group (-CH at any position in the alkyl group) 2 -But-SO 2 -substituted), alkylcarbonyloxy group (a group in which -CH 2 -CH 2 - is replaced by -CO-O-), alkylthio group (-CH 2 - is replaced with -S-. Examples of the alkoxy group, alkoxycarbonyl group, alkylcarbonyl group, alkylcarbonyloxy group, and alkylthio group include the same groups as those mentioned above. Examples of the alkylsulfonyl group include alkylsulfonyl groups having 1 to 17 carbon atoms, such as methylsulfonyl group, ethylsulfonyl group, and propylsulfonyl group. The number of carbon atoms in the alkylsulfonyl group is preferably 1 to 11, more preferably 1 to 6, and even more preferably 1 to 4. The substitution in the alkenyl group or alkynyl group may be any of the substitutions in the alkyl group exemplified above, as long as it contains a carbon-carbon double bond or a carbon-carbon triple bond at any position.

[0028] The alicyclic hydrocarbon group may be any of monocyclic, polycyclic and spirocyclic, and may be any of saturated and unsaturated. Examples of the alicyclic hydrocarbon group include monocyclic cycloalkyl groups such as cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cyclooctyl, cyclononyl, cyclodecyl and cyclododecyl, and polycyclic cycloalkyl groups such as norbornyl and adamantyl. Alicyclic hydrocarbon group or -CH contained in an alicyclic hydrocarbon group 2 - is -O-, -S-, -CO- or -SO 2Specific examples of the group substituted for - include the following groups: The binding site may be any position. TIFF0007659418000021.tif79161 TIFF0007659418000022.tif58160Alicyclic hydrocarbon group or -CH contained in an alicyclic hydrocarbon group 2 - is -O-, -S-, -CO- or -SO 2 As the group substituted with -, the groups represented by formulae (y1) to (y71) are preferable, the groups represented by any one of formulae (y1) to (y20), (y26), (y27), (y30), (y31), and (y39) to (y71) are more preferable, and the groups represented by formulae (y3), (y4), (y9), (y11), (y14), (y15), (y16), (y20), (y26), (y27), (y30), (y31), (y39), (y40), (y42), (y43), (y49) to (y58), and (y62) to (y71) are even more preferable. The alicyclic hydrocarbon group preferably has 3 to 36 carbon atoms, more preferably 3 to 24 carbon atoms, further preferably 3 to 18 carbon atoms, even further preferably 3 to 16 carbon atoms, and even further preferably 3 to 12 carbon atoms.

[0029] Examples of the aromatic hydrocarbon group include aryl groups such as a phenyl group, a naphthyl group, a biphenyl group, an anthryl group, a phenanthryl group, a binaphthyl group, etc. The number of carbon atoms in the aromatic hydrocarbon group is preferably 6 to 36, more preferably 6 to 24, still more preferably 6 to 18, still more preferably 6 to 14, and still more preferably 6 to 10. In the case of a combined group, the above groups may contain groups having different valences (such as an alkanediyl group, an alkanetriyl group, an alkanetetrayl group, a cycloalkanediyl group, a cycloalkanetriyl group, or a cycloalkanetetrayl group).

[0030] The combined groups are: A group that combines an alicyclic hydrocarbon group with a chain hydrocarbon group (the -CH contained in the chain hydrocarbon group and the alicyclic hydrocarbon group) 2 - is -O-, -S-, -CO- or -SO 2 -), A group combining a chain hydrocarbon group and an aromatic hydrocarbon group (the -CH 2 - is -O-, -S-, -CO- or -SO 2 -), and A group that combines an alicyclic hydrocarbon group with an aromatic hydrocarbon group (the -CH 2 - is -O-, -S-, -CO- or -SO 2 - (which may be replaced by ). In addition, in the combination, two or more types of each of the alicyclic hydrocarbon groups, the chain hydrocarbon groups and the aromatic hydrocarbon groups may be combined. Specifically, the combined groups are Alicyclic hydrocarbon groups such as adamantylmethylene group, cyclohexylmethylene group, etc. - Chain hydrocarbon groups -* (alicyclic hydrocarbon groups) 2 - Acyclic hydrocarbon group -* (-CH contained in the acyclic hydrocarbon group and the alicyclic hydrocarbon group) 2 - is -O-, -S-, -CO- or -SO 2 -), Methyladamantyl group, dimethyladamantyl group, and other chain hydrocarbon groups - Alicyclic hydrocarbon groups - * (chain hydrocarbon groups) 2 -Alicyclic hydrocarbon group-* (-CH contained in the chain hydrocarbon group and the alicyclic hydrocarbon group) 2 - is -O-, -S-, -CO- or -SO 2 -), Aromatic hydrocarbon groups such as tolyl and xylyl groups - (-CH 2 - is -O-, -S-, -CO- or -SO 2 -), Methylcyclohexylmethylene group and other chain hydrocarbon groups - Alicyclic hydrocarbon groups - Chain hydrocarbon groups -* (chain hydrocarbon groups) 2 -Alicyclic hydrocarbon group-open chain hydrocarbon group-*, (open chain hydrocarbon group-alicyclic hydrocarbon group) 2 - Acyclic hydrocarbon group -* (-CH contained in the acyclic hydrocarbon group and the alicyclic hydrocarbon group) 2 - is -O-, -S-, -CO- or -SO 2 -), Aromatic hydrocarbon groups such as benzyl groups - Chain hydrocarbon groups -* (-CH contained in the chain hydrocarbon groups) 2 - is -O-, -S-, -CO- or -SO 2 -), Aromatic hydrocarbon groups such as tolylmethyl groups - Aromatic hydrocarbon groups - Aromatic hydrocarbon groups - Aromatic hydrocarbon groups -* (-CH contained in the aromatic hydrocarbon groups) 2 - is -O-, -S-, -CO- or -SO 2 -), Methyladamantane methylene adamantyl group, di(methyladamantane methylene) adamantyl group, etc. Chain hydrocarbon group-alicyclic hydrocarbon group-chain hydrocarbon group-alicyclic hydrocarbon group-*, (chain hydrocarbon group-alicyclic hydrocarbon group-chain hydrocarbon group) 2 -Alicyclic hydrocarbon group-*, (chain hydrocarbon group-alicyclic hydrocarbon group) 2 -Open chain hydrocarbon group-Alicyclic hydrocarbon group-*, (Open chain hydrocarbon group) 2 -Alicyclic hydrocarbon group-Open chain hydrocarbon group-Alicyclic hydrocarbon group-* (-CH contained in the open chain hydrocarbon group and the alicyclic hydrocarbon group) 2 - is -O-, -S-, -CO- or -SO 2 -), Alicyclic hydrocarbon group-Acyclic hydrocarbon group-Acyclic hydrocarbon group-Acyclic hydrocarbon group-*, (Alicyclic hydrocarbon group) 2 -Open chain hydrocarbon group-alicyclic hydrocarbon group-open chain hydrocarbon group-*, (alicyclic hydrocarbon group-open chain hydrocarbon group) 2 -Alicyclic hydrocarbon group-open chain hydrocarbon group-*, (alicyclic hydrocarbon group-open chain hydrocarbon group-alicyclic hydrocarbon group) 2- Acyclic hydrocarbon group -* (-CH contained in the acyclic hydrocarbon group and the alicyclic hydrocarbon group) 2 - is -O-, -S-, -CO- or -SO 2 -), Acyclic hydrocarbon group-alicyclic hydrocarbon group-acyclic hydrocarbon group-acyclic hydrocarbon group-acyclic hydrocarbon group-*, (acyclic hydrocarbon group) 2 -Alicyclic hydrocarbon group-Open chain hydrocarbon group-Alicyclic hydrocarbon group-Open chain hydrocarbon group-*, (Open chain hydrocarbon group-Alicyclic hydrocarbon group) 2 -Open chain hydrocarbon group-alicyclic hydrocarbon group-open chain hydrocarbon group-*, (open chain hydrocarbon group-alicyclic hydrocarbon group-open chain hydrocarbon group) 2 -Alicyclic hydrocarbon group-Open chain hydrocarbon group-*, (Open chain hydrocarbon group-Alicyclic hydrocarbon group-Open chain hydrocarbon group-Alicyclic hydrocarbon group) 2 - Acyclic hydrocarbon group -* (-CH contained in the acyclic hydrocarbon group and the alicyclic hydrocarbon group) 2 - is -O-, -S-, -CO- or -SO 2 -), Here, * indicates the bond position to the carbon atom of the carbonyl group.

[0031] X 0 The -CH 2 - is -O-, -S-, -CO- or -SO 2 When X is replaced with -, the number of carbon atoms before the replacement is the total number of carbon atoms in the hydrocarbon group. 0 When a substituent is bonded to a hydrocarbon group represented by the following formula (I), the number of carbon atoms before substitution is regarded as the total number of carbon atoms in the hydrocarbon group. X 0 The hydrocarbon group represented by the following formula may have one or more substituents. Examples of the substituent include a hydroxy 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, an alicyclic hydrocarbon group having 3 to 12 carbon atoms, an aromatic hydrocarbon group having 6 to 10 carbon atoms, or a combination of these groups. 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. Examples of the alicyclic hydrocarbon group having 3 to 12 carbon atoms include the groups shown below. ** represents X 0 represents the bonding position with TIFF0007659418000023.tif17162 Examples of the aromatic hydrocarbon group having 6 to 10 carbon atoms include aryl groups such as a phenyl group and a naphthyl group. Examples of the combined group include a group in which a hydroxy group is combined with an alkyl group having 1 to 12 carbon atoms, a group in which an alkyl group having 1 to 12 carbon atoms is combined with an aromatic hydrocarbon group having 6 to 10 carbon atoms, and a group in which an alicyclic hydrocarbon group having 3 to 12 carbon atoms is combined with an aromatic hydrocarbon group having 6 to 10 carbon atoms. Examples of the group combining a hydroxy group with an alkyl group having 1 to 12 carbon atoms include hydroxyalkyl groups having 1 to 12 carbon atoms, such as a hydroxymethyl group and a hydroxyethyl group. Examples of the group formed by combining an alkyl group having 1 to 12 carbon atoms with an aromatic hydrocarbon group having 6 to 10 carbon atoms include aralkyl groups having 7 to 22 carbon atoms, such as a benzyl group, and alkylaryl groups having 7 to 22 carbon atoms, such as a tolyl group and a xylyl group. Examples of the group formed by combining an alicyclic hydrocarbon group having 3 to 12 carbon atoms with an aromatic hydrocarbon group having 6 to 10 carbon atoms include a cyclohexylphenyl group.

[0032] X 0 The hydrocarbon group represented by the formula (I) is preferably an aliphatic hydrocarbon group having 1 to 72 carbon atoms which may have a substituent (-CH 2 - is -O-, -S-, -CO- or -SO 2 -) or an aromatic hydrocarbon group having 6 to 36 carbon atoms which may have a substituent, More preferably, it is an alicyclic hydrocarbon group which may have a hydroxy group or a fluorine atom (provided that the -CH 2 - is -O-, -S-, -CO- or -SO 2 -), a group consisting of a combination of an alicyclic hydrocarbon group and a chain hydrocarbon group (the -CH 2 - is -O-, -S-, -CO- or -SO 2 - may be replaced by -, and -CH 2 - may be replaced by -O- or -CO-, and the alicyclic hydrocarbon group and the chain hydrocarbon group may have a fluorine atom or a hydroxy group; an aromatic hydrocarbon group having 6 carbon atoms which may have a halogen atom, a hydroxy group or a perfluoroalkyl group having 1 to 4 carbon atoms; a group represented by formula (aa) or a group represented by formula (bb); More preferably, *-alicyclic hydrocarbon group (-CH contained in the alicyclic hydrocarbon group) 2 - is -O-, -S-, -CO- or -SO 2 The alicyclic hydrocarbon group may have a hydroxy group or a fluorine atom. * is -COO -represents the bonding position with the carbon atom of the alicyclic hydrocarbon group. 2 - is -O-, -S-, -CO- or -SO 2 - may be replaced by -, and -CH 2 - may be replaced by -O- or -CO-, and the alicyclic hydrocarbon group and the chain hydrocarbon group may have a fluorine atom or a hydroxyl group. * is -COO - ), *-chain hydrocarbon group-alicyclic hydrocarbon group (-CH 2 - may be replaced by -O- or -CO-, and -CH contained in the alicyclic hydrocarbon group 2 - is -O-, -S-, -CO- or -SO 2 The chain hydrocarbon group and the alicyclic hydrocarbon group may have a fluorine atom or a hydroxyl group. - represents the bonding position with the carbon atom of More preferably, the polycyclic alicyclic hydrocarbon group (the -CH contained in the polycyclic alicyclic hydrocarbon group) 2 - is -O-, -S-, -CO- or -SO 2 The polycyclic alicyclic hydrocarbon group may have a hydroxy group or a fluorine atom. * is -COO - represents the bonding position with the carbon atom of the ring.) *-Polycyclic alicyclic hydrocarbon group-chain hydrocarbon group (-CH 2 - is -O-, -S-, -CO- or -SO 2 - may be replaced by -, and -CH 2 - may be replaced by -O- or -CO-, and the polycyclic alicyclic hydrocarbon group and the chain hydrocarbon group may have a fluorine atom or a hydroxyl group. * is -COO - represents the bonding position with the carbon atom of the2 - may be replaced by -O- or -CO-, and -CH contained in the polycyclic alicyclic hydrocarbon group 2 - is -O-, -S-, -CO- or -SO 2 The chain hydrocarbon group and the polycyclic alicyclic hydrocarbon group may have a fluorine atom or a hydroxy group. - represents the bonding position with the carbon atom of Particularly preferred are an adamantanone group, a hydroxyadamantyl group, and a group combining an adamantyl group with an alkyl group (wherein the alkyl group contains —CH 2 - may be replaced by -O- or -CO-.) A phenyl group having a group represented by the formula (Y30F) or a hydroxy group.

[0033] In the above groups, the number of carbon atoms in the alicyclic hydrocarbon group is preferably 3 to 36, more preferably 3 to 24, even more preferably 3 to 18, still more preferably 3 to 16, and even more preferably 3 to 12. The number of carbon atoms in the chain hydrocarbon group is preferably 1 to 18, more preferably 1 to 12, even more preferably 1 to 9, still more preferably 1 to 6, and even more preferably 1 to 4. The number of carbon atoms in the aromatic hydrocarbon group is preferably 6 to 36, more preferably 6 to 24, even more preferably 6 to 18, still more preferably 6 to 14, and even more preferably 6 to 10. TIFF0007659418000024.tif26127[In formula (aa), X a and X b each independently represents -O- or -S-. X 1a represents a hydrocarbon group having 1 to 24 carbon atoms which may have a substituent, and -CH 2 - is -O-, -S-, -CO- or -SO 2 - may be replaced. X2a represents a hydrocarbon group having 1 to 48 carbon atoms which may have a substituent, and -CH 2 - is -O-, -S-, -CO- or -SO 2 - may be replaced. * -COO - represents the bond position with the carbon atom of [In formula (bb), L A represents an alkanediyl group having 1 to 6 carbon atoms which may have a fluorine atom, or an aromatic hydrocarbon group having 6 carbon atoms which may have a halogen atom or a perfluoroalkyl group having 1 to 4 carbon atoms. L B represents a single bond or an alkanediyl group having 1 to 6 carbon atoms, and the -CH 2 - is -O-, -S-, -CO- or -SO 2 - may be replaced. R A 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. * -COO - represents the bond position with the carbon atom of

[0034] X a and X b are preferably the same atom, and more preferably both are oxygen atoms.

[0035] X 1a and X 2a Examples of the hydrocarbon group represented by the formula include an aliphatic hydrocarbon group, an aromatic hydrocarbon group, or a group in which two or more of these are combined. These hydrocarbon groups may have a substituent. In addition, the -CH 2 - is -O-, -S-, -CO- or -SO 2 Here, the number of carbon atoms in the hydrocarbon group means the number of carbon atoms in the hydrocarbon group that does not have a substituent and is not substituted.

[0036] X 1a Examples of the aliphatic hydrocarbon group include chain hydrocarbon groups such as alkanetriyl groups, alicyclic hydrocarbon groups, and combinations thereof. Specific examples of the alkanetriyl group include a methine group, an ethanetriyl group, a propanetriyl group, a butanetriyl group, a pentanetriyl group, a hexanetriyl group, a heptanetriyl group, an octanetriyl group, a nonanetriyl group, a decanetriyl group, an undecanetriyl group, and a dodecanetriyl group.

[0037] The alicyclic hydrocarbon group may be either monocyclic or polycyclic. Examples of the monocyclic alicyclic hydrocarbon group include a cyclobutanetriyl group, a cyclopentanetriyl group, a cyclohexanetriyl group, and a cyclooctanetriyl group. Examples of the polycyclic alicyclic hydrocarbon group include a norbornanetriyl group and an adamantanetriyl group. Examples of the aromatic hydrocarbon group include a benzenetriyl group, a naphthalenetriyl group, and an anthracenetriyl group. In the case of a combination of groups, the above groups may contain groups having different valences (such as an alkyl group, an alkanediyl group, an alkanetetrayl group, a cycloalkyl group, a cycloalkanediyl group, or a cycloalkanetetrayl group).

[0038] X 1a The hydrocarbon group represented by the formula (I) has 1 to 24 carbon atoms and may further have one or more substituents. Examples of the substituents include a hydroxy 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, an alicyclic hydrocarbon group having 3 to 12 carbon atoms, an aromatic hydrocarbon group having 6 to 10 carbon atoms, or a combination of these groups. Examples of the halogen atom, alkyl group, alkoxy group, alkoxycarbonyl group, alkylcarbonyl group, alkylcarbonyloxy group, alicyclic hydrocarbon group, aromatic hydrocarbon group, and combinations thereof include the same groups as described above.

[0039] X 1a The hydrocarbon group represented by the formula (i) is preferably an alkanetriyl group having 1 to 6 carbon atoms which may have a substituent or an alicyclic hydrocarbon group having 3 to 18 carbon atoms which may have a substituent, more preferably an alkanetriyl group having 1 to 6 carbon atoms or a group represented by formula (w1-1) to formula (w1-11), and even more preferably an alkanetriyl group having 1 to 6 carbon atoms, a polycyclic hydrocarbon group such as an alkanetriyl group having 1 to 6 carbon atoms, a group represented by formula (w1-1) or a group represented by formula (w1-3), or a monocyclic hydrocarbon group such as a group represented by formula (w1-2) or a group represented by formula (w1-6). TIFF0007659418000025.tif53144 [Formula (w1-1) to formula (w1-11), The ring may have a hydroxy 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, an alicyclic hydrocarbon group having 3 to 12 carbon atoms, an aromatic hydrocarbon group having 6 to 10 carbon atoms, or a combination of these groups. * indicates the bond position.]

[0040] X 2a The hydrocarbon group represented by the following formula (I) preferably has 2 to 48 carbon atoms, more preferably 4 to 48 carbon atoms, even more preferably 6 to 44 carbon atoms, even more preferably 8 to 40 carbon atoms, and even more preferably 10 to 38 carbon atoms.

[0041] X 2aExamples of the substituent that the hydrocarbon group in the formula (I) may have include a hydroxy 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, an alicyclic hydrocarbon group having 3 to 12 carbon atoms, an aromatic hydrocarbon group having 6 to 10 carbon atoms, or a combination of these. Examples of the halogen atom, alkyl group, alkoxy group, alkoxycarbonyl group, alkylcarbonyl group, alkylcarbonyloxy group, alicyclic hydrocarbon group, aromatic hydrocarbon group, and combinations thereof include the same groups as those mentioned above. X 2a The hydrocarbon group having 1 to 48 carbon atoms represented by the following formula may have one or more substituents.

[0042] X 2a Examples of the hydrocarbon group in include linear or branched chain hydrocarbon groups (e.g., alkanediyl groups, etc.), monocyclic or polycyclic alicyclic hydrocarbon groups, and aromatic hydrocarbon groups, and may be a combination of two or more of these groups. Specific examples of such alkyl groups 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, and an octane-1,8-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 alicyclic hydrocarbon groups such as monocyclic cycloalkanediyl groups, such as cyclobutane-1,3-diyl, cyclopentane-1,3-diyl, cyclohexane-1,4-diyl, and cyclooctane-1,5-diyl groups; polycyclic alicyclic hydrocarbon groups such as norbornane-1,4-diyl, norbornane-2,5-diyl, adamantane-1,5-diyl, and adamantane-2,6-diyl groups; Examples of the aromatic hydrocarbon groups include a phenylene group, a naphthylene group, a biphenylene group, an anthrylene group, a phenanthrylene group, and a binaphthylene group.

[0043] In the case of a combination of groups, the above groups may contain groups having different valences (such as an alkyl group, an alkanetriyl group, an alkanetetrayl group, a cycloalkyl group, a cycloalkanetriyl group, or a cycloalkanetetrayl group). Examples of the combined group include a group in which a chain hydrocarbon group and an alicyclic hydrocarbon group are combined, a group in which a chain hydrocarbon group and an aromatic hydrocarbon group are combined, and a group in which an alicyclic hydrocarbon group and an aromatic hydrocarbon group are combined. Specifically, a group in which one or more alicyclic hydrocarbon groups are bonded to a chain hydrocarbon group (for example, -chain hydrocarbon group-alicyclic hydrocarbon group, -chain hydrocarbon group-(alicyclic hydrocarbon group) 2 etc.), groups in which one or more chain hydrocarbon groups are bonded to an alicyclic hydrocarbon group (for example, -alicyclic hydrocarbon group-chain hydrocarbon group, -alicyclic hydrocarbon group-(chain hydrocarbon group) 2 etc.), groups in which one or more alicyclic hydrocarbon groups and a chain hydrocarbon group are bonded to a chain hydrocarbon group (for example, -chain hydrocarbon group-alicyclic hydrocarbon group-chain hydrocarbon group, -chain hydrocarbon group-(alicyclic hydrocarbon group-chain hydrocarbon group) 2 etc.)

[0044] X 2a As the hydrocarbon group in A chain hydrocarbon group having 2 to 18 carbon atoms (-CH contained in the chain hydrocarbon group) 2 - may be replaced by -O- or -CO-, and the chain hydrocarbon group may have a substituent. Alicyclic hydrocarbon groups having 3 to 18 carbon atoms (-CH contained in the alicyclic hydrocarbon groups) 2 - is -O-, -S-, -CO- or -SO 2-, and the alicyclic hydrocarbon group may have a substituent.), or a chain hydrocarbon group having 1 to 12 carbon atoms (the -CH contained in the chain hydrocarbon group may be replaced with -). 2 - may be replaced by -O- or -CO-.) and an alicyclic hydrocarbon group having 3 to 18 carbon atoms (the -CH 2 - is -O-, -S-, -CO- or -SO 2 - (which may be substituted with -), A chain hydrocarbon group having 4 to 18 carbon atoms (-CH contained in the chain hydrocarbon group) 2 - may be replaced by -O- or -CO-, and the chain hydrocarbon group may have a substituent. A chain hydrocarbon group having 1 to 12 carbon atoms (-CH contained in the chain hydrocarbon group) 2 - may be replaced by -O- or -CO-.) and an alicyclic hydrocarbon group having 3 to 16 carbon atoms (the -CH 2 - is -O-, -S-, -CO- or -SO 2 - (which may be substituted with -), A chain hydrocarbon group having 6 to 14 carbon atoms (-CH contained in the chain hydrocarbon group) 2 - may be replaced by -O- or -CO-, and the chain hydrocarbon group may have a substituent. A chain hydrocarbon group having 1 to 12 carbon atoms (-CH contained in the chain hydrocarbon group) 2 - may be replaced by -O- or -CO-.) and an alicyclic hydrocarbon group having 5 to 14 carbon atoms (the -CH 2 - is -O-, -S-, -CO- or -SO 2 - which may be replaced by -.) is more preferable (the group may have a substituent).

[0045] Specifically, X 2a Examples of the hydrocarbon group in An alkanediyl group having 2 to 18 carbon atoms (the —CH 2 - may be replaced by -O- or -CO-, and the alkanediyl group may have a substituent. Alicyclic hydrocarbon groups having 3 to 18 carbon atoms (-CH contained in the alicyclic hydrocarbon groups) 2 - is -O-, -S-, -CO- or -SO 2 -, and the alicyclic hydrocarbon group may have a substituent. An alkanediyl group having 1 to 12 carbon atoms (the —CH 2 - may be replaced by -O- or -CO-.) and an alicyclic hydrocarbon group having 3 to 18 carbon atoms (the -CH 2 - is -O-, -S-, -CO- or -SO 2 - (which may be substituted with -), or An alkanediyl group having 1 to 12 carbon atoms (the —CH 2 may be replaced by -O- or -CO-.) and an alicyclic hydrocarbon group having 3 to 18 carbon atoms and an alkyl group having 1 to 12 carbon atoms (the -CH 2 - may be replaced by -O- or -CO-; and the group may have a substituent. An alkanediyl group having 4 to 18 carbon atoms (the —CH 2 - may be replaced by -O- or -CO-, and the alkanediyl group may have a substituent. An alkanediyl group having 1 to 12 carbon atoms (the —CH 2 - may be replaced by -O- or -CO-.) and an alicyclic hydrocarbon group having 3 to 16 carbon atoms (the -CH 2 - is -O-, -S-, -CO- or -SO 2 - (which may be substituted with -), or An alkanediyl group having 1 to 12 carbon atoms (the —CH 2 - may be replaced by -O- or -CO-.) and an alicyclic hydrocarbon group having 3 to 16 carbon atoms and an alkyl group having 1 to 12 carbon atoms (the -CH 2 - may be replaced by -O- or -CO-; and An alkanediyl group having 6 to 14 carbon atoms (the —CH 2 - may be replaced by -O- or -CO-, and the alkanediyl group may have a substituent. An alkanediyl group having 1 to 12 carbon atoms (the —CH 2 - may be replaced by -O- or -CO-.) and an adamantanediyl group (-CH 2 - may be replaced by -O- or -CO-; and the group may have a substituent; or An alkanediyl group having 1 to 12 carbon atoms (the —CH 2 - may be replaced by -O- or -CO-.) and an adamantanediyl group and an alkyl group having 1 to 12 carbon atoms (the -CH 2 -may be replaced by -O- or -CO-; and the group (which may have a substituent) is more preferable.

[0046] More specifically, X 2a is the formula (X 2 -1), a group represented by the formula (X 2 -2), a group represented by the formula (X 2 -3) or a group represented by the formula (X 2 -4) is preferred. TIFF0007659418000026.tif35158[In the formula, R 1x , R 2x , R 3x , R 4x , R5x and R 6x each independently represents an alkyl group having 1 to 6 carbon atoms, an alicyclic hydrocarbon group having 5 to 12 carbon atoms, or a group combining two or more of these groups, and -CH contained in the alkyl group and the alicyclic hydrocarbon group 2 - is -O-, -S-, -CO- or -SO 2 The alkyl group and the alicyclic hydrocarbon group may each have a substituent. * is X a and X b represents the bond position with The combined group may be a combination of one each of the above-mentioned alkyl groups and alicyclic hydrocarbon groups, or a combination of two or more of either or both of them. In this case, the number of carbon atoms in the combined group is 39 or less, and preferably 37 or less.

[0047] Among them, R 1x , R 2x , R 3x , R 4x , R 5x and R 6x As the alkyl group, an alkyl group having 1 to 6 carbon atoms (including —CH 2 may be replaced by -O- or -CO-, and the alkyl group may have a substituent.), an alicyclic hydrocarbon group having 5 to 12 carbon atoms (the -CH 2 - is -O-, -S-, -CO- or -SO 2 -, and the alicyclic hydrocarbon group may have a substituent.) or an alkyl group having 1 to 6 carbon atoms (the -CH 2 - may be replaced by -O- or -CO-.) and an alicyclic hydrocarbon group having 5 to 12 carbon atoms (the -CH 2 - is -O-, -S-, -CO- or -SO 2 - may be replaced by -.) (the group may have a substituent). 2- may be replaced by -O- or -CO-, and the adamantyl group may have a substituent.) or an alkyl group having 1 to 6 carbon atoms (the -CH 2 -may be replaced by -O- or -CO-) and an adamantyl group (which may have a substituent).

[0048] In formula (bb), L A and L B In the above formula, 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 propane-1,2-diyl, 1-methylpropane-1,3-diyl, 2-methylpropane-1,3-diyl, 2-methylpropane-1,2-diyl, 1-methylbutane-1,4-diyl, and 2-methylbutane-1,4-diyl groups. The number of carbon atoms in the alkanediyl group is preferably 1 to 4, and more preferably 1 to 3. Examples of the alkanediyl group which may have a fluorine atom include perfluoroalkanediyl groups such as a difluoromethylene group, a perfluoroethylene group, a perfluoropropanediyl group, a perfluorobutanediyl group, and a perfluoropentanediyl group.

[0049] The alkanediyl group contains -CH 2 When - is replaced by -O- or -CO-, the number of carbon atoms before the replacement is counted as the total number of carbon atoms in the alkanediyl group. 2 - is replaced by -O-), carboxy group (-CH contained in ethyl group) 2 -CH 2 - is replaced by -O-CO-), alkoxy group (-CH 2 - is replaced by -O-), alkoxycarbonyl group (-CH 2-CH 2 - is replaced by -O-CO-), alkylcarbonyl group (-CH 2 - is replaced by -CO-), alkylcarbonyloxy group (-CH 2 -CH 2 - is replaced by -CO-O-), alkanediyloxy group (-CH at any position in the alkanediyl group) 2 - is replaced by -O-), alkanediyloxycarbonyl group (-CH 2 -CH 2 - is replaced by -O-CO-), alkanediylcarbonyl group (-CH at any position in the alkanediyl group) 2 - is replaced by -CO-), alkanediylcarbonyloxy group (-CH at any position in the alkanediyl group) 2 -CH 2 - may be replaced with -CO-O-. Examples of the alkanediyloxy group include a methyleneoxy group, an ethyleneoxy group, a propanediyloxy group, a butanediyloxy group, and a pentanediyloxy group. Examples of the alkanediyloxycarbonyl group include a methyleneoxycarbonyl group, an ethyleneoxycarbonyl group, a propanediyloxycarbonyl group, and a butanediyloxycarbonyl group. Examples of the alkanediylcarbonyl group include a methylenecarbonyl group, an ethylenecarbonyl group, a propanediylcarbonyl group, a butanediylcarbonyl group, and a pentanediylcarbonyl group. Examples of the alkanediylcarbonyloxy group include a methylenecarbonyloxy group, an ethylenecarbonyloxy group, a propanediylcarbonyloxy group, and a butanediylcarbonyloxy group. L Ais preferably an alkanediyl group having 1 to 4 carbon atoms which may have a fluorine atom, and more preferably an alkanediyl group having 1 to 3 carbon atoms which has a fluorine atom. L B is a single bond or an alkanediyl group having 1 to 3 carbon atoms (the —CH 2 - may be replaced by -O- or -CO-, and a single bond, a methylene group or an ethylene group is more preferable.

[0050] R A Examples of the hydrocarbon group in 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, an n-dodecyl group, etc. The number of carbon atoms in the alkyl group is preferably 1 to 18, more preferably 1 to 12, still more preferably 1 to 9, still more preferably 1 to 6, and still more preferably 1 to 4. 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. -CH contained in chain hydrocarbon group 2 - is -O-, -S-, -CO- or -SO 2Examples of the group substituted for - include a hydroxy group, a carboxy group, an alkoxy group, an alkoxycarbonyl group, an alkylcarbonyl group, an alkylcarbonyloxy group, an alkylthio group, and an alkylsulfonyl group. Examples of the alkoxy group, alkoxycarbonyl group, alkylcarbonyl group, alkylcarbonyloxy group, alkylsulfonyl group and alkylthio group include an alkoxy group having 1 to 17 carbon atoms, an alkoxycarbonyl group having 2 to 17 carbon atoms, an alkylcarbonyl group having 2 to 18 carbon atoms, an alkylcarbonyloxy group having 2 to 17 carbon atoms, an alkylsulfonyl group having 2 to 17 carbon atoms and an alkylthio group having 1 to 17 carbon atoms, and examples of the same groups as those mentioned above.

[0051] The alicyclic hydrocarbon group may be any of monocyclic, polycyclic and spirocyclic, and may be any of saturated and 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. Alicyclic hydrocarbon groups and -CH contained in alicyclic hydrocarbon groups 2 - is -O-, -S-, -CO- or -SO 2 Specific examples of the group substituted with - include the groups represented by the above formulas (y1) to (y71). The number of carbon atoms in the alicyclic hydrocarbon group is preferably 3 to 36, more preferably 3 to 24, still more preferably 3 to 18, even more preferably 3 to 16, and still more preferably 3 to 12. Examples of the aromatic hydrocarbon group include aryl groups such as a phenyl group, a naphthyl group, a biphenyl group, an anthryl group, a phenanthryl group, a binaphthyl group, etc. The number of carbon atoms in the aromatic hydrocarbon group is preferably 6 to 36, more preferably 6 to 24, still more preferably 6 to 18, still more preferably 6 to 14, and still more preferably 6 to 10. In the case of a combination of groups, the above groups may contain groups having different valences (such as an alkanediyl group, an alkanetriyl group, a cycloalkanediyl group, and a cycloalkanetriyl group).

[0052] Groups formed by combination include groups that combine an aromatic hydrocarbon group with a chain hydrocarbon group (e.g., aromatic hydrocarbon group-alkanediyl group-*, alkyl group-aromatic hydrocarbon group-*), groups that combine an alicyclic hydrocarbon group with a chain hydrocarbon group (e.g., alicyclic hydrocarbon group-alkanediyl group-*, alkyl group-alicyclic hydrocarbon group-*), and groups that combine 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 a cyclohexylmethyl group, a cyclohexylethyl group, a 1-(adamantan-1-yl)methyl group, and a 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 aromatic hydrocarbon group-alicyclic hydrocarbon group-* include a phenyladamantyl group. Examples of the alicyclic hydrocarbon group-aromatic hydrocarbon group-* include an adamantylphenyl group. In addition, in the combination, two or more of the alicyclic hydrocarbon groups, aromatic hydrocarbon groups, and chain hydrocarbon groups may be combined. B may be bound to -CH contained in the hydrocarbon group 2- is -O-, -S-, -CO- or -SO 2 Examples of the group substituted with - include, in addition to the groups mentioned above, a cycloalkoxy group, a cycloalkylalkoxy group, an alkoxycarbonyloxy group, an aromatic hydrocarbon group-carbonyloxy group, and a group in which two or more of these groups are combined. Examples of the cycloalkoxy group include cycloalkoxy groups having 3 to 17 carbon atoms, such as a cyclohexyloxy group. Examples of the cycloalkylalkoxy group include cycloalkylalkoxy groups having 4 to 17 carbon atoms, such as a cyclohexylmethoxy group. Examples of the alkoxycarbonyloxy group include alkoxycarbonyloxy groups having 2 to 16 carbon atoms, such as a butoxycarbonyloxy group. Examples of the aromatic hydrocarbon group-carbonyloxy group include aromatic hydrocarbon group-carbonyloxy groups having 7 to 17 carbon atoms, such as a benzoyloxy group. -CH contained in the hydrocarbon group 2 -, -O-, -S-, -SO 2 When the carbon atom is replaced by - or -CO-, the number of carbon atoms before the replacement is regarded as the total number of carbon atoms in the hydrocarbon group.

[0053] R A The substituent that the hydrocarbon group may have is, for example, a halogen atom, a cyano group, an alkyl group having 1 to 12 carbon atoms (including the —CH 2 - is -O-, -S-, -CO- or -SO 2 - may be substituted). Examples of the halogen atom include the same groups as those mentioned above. Examples of the alkyl group having 1 to 12 carbon atoms include the same groups as those mentioned above. -CH in the alkyl group 2 Examples of the group in which - is replaced by -O- or -CO- include a hydroxy group, a carboxy group, an alkoxy group, an alkoxycarbonyl group, an alkylcarbonyl group, and an alkylcarbonyloxy group. Examples of the alkoxy group, alkoxycarbonyl group, alkylcarbonyl group and alkylcarbonyloxy group include an alkoxy group having 1 to 11 carbon atoms, an alkoxycarbonyl group having 2 to 11 carbon atoms, an alkylcarbonyl group having 2 to 12 carbon atoms, and an alkylcarbonyloxy group having 2 to 11 carbon atoms, and examples thereof include the same groups as those described above. R A The hydrocarbon group in may have one or more substituents.

[0054] R A The hydrocarbon group in the formula (I) is an alkyl group having 1 to 12 carbon atoms which may have a substituent (provided that the —CH 2 - is -O-, -S-, -CO- or -SO 2 -) or a cyclic hydrocarbon group having 3 to 18 carbon atoms which may have a substituent (provided that the -CH 2 - is -O-, -S-, -CO- or -SO 2 - may be substituted.) and a cyclic hydrocarbon group having 3 to 18 carbon atoms which may have a fluorine atom, a hydroxyl group, or an alkyl group having 1 to 6 carbon atoms (with the proviso that the -CH 2 - is -O-, -S-, -CO- or -SO 2 - may be replaced by.) is preferred.

[0055] Examples of the cyclic hydrocarbon group include cyclic hydrocarbon groups such as monocyclic or polycyclic alicyclic hydrocarbon groups having 3 to 18 carbon atoms and aromatic hydrocarbon groups having 6 to 18 carbon atoms, or combinations of these groups. Examples of the alicyclic hydrocarbon group, aromatic hydrocarbon group, and combined group include the same groups as those described above. In the combination, two or more types of alicyclic hydrocarbon groups and aromatic hydrocarbon groups may be combined. B may be bound to

[0056] A cyclic hydrocarbon group having 3 to 18 carbon atoms (the cyclic hydrocarbon group may have a fluorine atom, a hydroxyl group, or an alkyl group having 1 to 6 carbon atoms, and the -CH 2 - is -O-, -S-, -CO- or -SO 2 - may be replaced by . An alicyclic hydrocarbon group having 3 to 18 carbon atoms which may have a fluorine atom, a hydroxyl group, or an alkyl group having 1 to 4 carbon atoms (-CH contained in the alicyclic hydrocarbon group) 2 - is -O-, -S-, -CO- or -SO 2 -), or It is preferably an aromatic hydrocarbon group having 6 to 18 carbon atoms which may have a fluorine atom, a hydroxyl group, or an alkyl group having 1 to 4 carbon atoms, An alicyclic hydrocarbon group having 3 to 18 carbon atoms which may have a fluorine atom, a hydroxyl group, or an alkyl group having 1 to 4 carbon atoms (-CH contained in the alicyclic hydrocarbon group) 2 - may be replaced by -O- or -CO-) is more preferable. Preferred examples of the alicyclic hydrocarbon group include a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, a cyclohexyl group, a norbornyl group, an adamantyl group, and the groups shown below (the bonding site is at any position), and preferred examples of the aromatic hydrocarbon group include a phenyl group and a naphthyl group. TIFF0007659418000027.tif1687

[0057] Examples of the carboxylate anion in the carboxylate salt represented by formula (I) include the carboxylate anions described below. TIFF0007659418000028.tif141165

[0058] TIFF0007659418000029.tif233166

[0059] TIFF0007659418000030.tif72168

[0060] TIFF0007659418000031.tif164164

[0061] TIFF0007659418000032.tif173159

[0062] Specific examples of the carboxylate (I) include salts of any combination of the above-mentioned cations and anions. Specific examples of the salt (I) are shown in the table below. In the following table, each symbol represents the symbol attached to the structure representing the above-mentioned anion or cation, and "~" indicates that the carboxylate (I) corresponds to the anion (I). For example, the carboxylate (I-1) is a salt consisting of the anion represented by formula (Ia-1) and the cation represented by formula (Ic-1), the carboxylate (I-2) is a salt consisting of the anion represented by formula (Ia-2) and the cation represented by formula (Ic-1), and the carboxylate (I-96) is a salt consisting of the anion represented by formula (Ia-1) and the cation represented by formula (Ic-2). TIFF0007659418000033.tif29121

[0063] [Table 1]

[0064] Among them, the carboxylate (I) is preferably a salt obtained by combining an anion represented by any one of formulas (Ia-1) to (Ia-5), (Ia-10) to (Ia-21), and (Ia-57) to (Ia-66) with a cation represented by any one of formulas (Ic-1) to (Ic-32). Specifically, the carboxylate (I-1) to (I-5), the carboxylate (I-10) to (I-21), the carboxylate (I-57) to (I-66), the carboxylate (I-96) to (I-100), the carboxylate (I-105) to (I-106) are preferably used. Carboxylic acid salt (I-116), Carboxylic acid salt (I-152)~Carboxylic acid salt (I-161), Carboxylic acid salt (I-191)~Carboxylic acid salt (I-195), Carboxylic acid salt (I-200)~Carboxylic acid salt (I-211), Carboxylic acid salt (I-247)~Carboxylic acid salt (I-256), Carboxylic acid salt (I-286)~Carboxylic acid salt (I-290), Carboxylic acid salt (I-295)~Carboxylic acid salt (I-306), Carboxylic acid salt (I-342)~Carboxylic acid salt (I-351), Carboxylic acid salt (I-381)~Carboxylic acid salt (I-385), Carboxylic acid salt (I-390)~Carboxylic acid salt (I-401), Carboxylic acid salt (I-402), Carboxylic acid salt (I-403), Carboxylic acid salt (I-404), Carboxylic acid salt (I-405), Carboxylic acid salt (I-406), Car ...1), Carboxylic acid salt (I-401), Carboxylic acid salt (I-401), Carboxylic acid salt (I-401), Carboxylic acid salt (I-401), Carboxylic acid salt (I-401), Carboxylic acid salt (I-401), Carboxylic acid salt (I Carboxylic acid salt (I-437)~Carboxylic acid salt (I-446), Carboxylic acid salt (I-476)~Carboxylic acid salt (I-480), Carboxylic acid salt (I-485)~Carboxylic acid salt (I-496), Carboxylic acid salt (I-532)~Carboxylic acid salt (I-541), Carboxylic acid salt (I-571)~Carboxylic acid salt (I-575), Carboxylic acid salt (I-580)~Carboxylic acid salt (I-591), Carboxylic acid salt (I-627)~Carboxylic acid salt (I-636), Carboxylic acid salt (I-666)~Carboxylic acid salt (I-670), Carboxylic acid salt (I-675)~Carboxylic acid salt (I-686), Carboxylic acid salt (I-72 ... Carboxylic acid salt (I-731), Carboxylic acid salt (I-761)~Carboxylic acid salt (I-765), Carboxylic acid salt (I-770)~Carboxylic acid salt (I-781), Carboxylic acid salt (I-817)~Carboxylic acid salt (I-826), Carboxylic acid salt (I-856)~Carboxylic acid salt (I-860), Carboxylic acid salt (I-865)~Carboxylic acid salt (I-876), Carboxylic acid salt (I-912)~Carboxylic acid salt (I-921), Carboxylic acid salt (I-951)~Carboxylic acid salt (I-955), Carboxylic acid salt (I-960)~Carboxylic acid salt (I-971), Carboxylic acid salt (I-1007)~Carboxylic acid salt (I-1016),Carboxylic acid salt (I-1046)~Carboxylic acid salt (I-1050), Carboxylic acid salt (I-1055)~Carboxylic acid salt (I-1066), Carboxylic acid salt (I-1102)~Carboxylic acid salt (I-1111), Carboxylic acid salt (I-1141)~Carboxylic acid salt (I-1145), Carboxylic acid salt (I-1150)~Carboxylic acid salt (I-1161), Carboxylic acid salt (I-1197)~Carboxylic acid salt (I-1206), Carboxylic acid salt (I-1236)~Carboxylic acid salt (I-1240), Carboxylic acid salt (I-1245)~Carboxylic acid salt (I-1256), Carboxylic acid salt (I-1292)~Carboxylic acid salt (I -1301), Carboxylic acid salt (I-1331)~Carboxylic acid salt (I-1335), Carboxylic acid salt (I-1340)~Carboxylic acid salt (I-1351), Carboxylic acid salt (I-1387)~Carboxylic acid salt (I-1396), Carboxylic acid salt (I-1426)~Carboxylic acid salt (I-1430), Carboxylic acid salt (I-1435)~Carboxylic acid salt (I-1446), Carboxylic acid salt (I-1482)~Carboxylic acid salt (I-1491), Carboxylic acid salt (I-1521)~Carboxylic acid salt (I-1525), Carboxylic acid salt (I-1530)~Carboxylic acid salt (I-1541), Carboxylic acid salt (I-1577)~ Carboxylic acid salt (I-1586), Carboxylic acid salt (I-1616)~Carboxylic acid salt (I-1620), Carboxylic acid salt (I-1625)~Carboxylic acid salt (I-1636), Carboxylic acid salt (I-1672)~Carboxylic acid salt (I-1681), Carboxylic acid salt (I-1711)~Carboxylic acid salt (I-1715), Carboxylic acid salt (I-1720)~Carboxylic acid salt (I-1731), Carboxylic acid salt (I-1767)~Carboxylic acid salt (I-1776), Carboxylic acid salt (I-1806)~Carboxylic acid salt (I-1810), Carboxylic acid salt (I-1815)~Carboxylic acid salt (I-1826), Carboxylic acid salt (I -1862)~Carvone salt(I-1871), Carvone salt(I-1901)~Carvone salt(I-1905), Carvone salt(I-1910)~Carvone salt(I-1921), Carvone salt(I-1957)~Carvone salt(I-1966), Carvone salt(I-1996)~Carvone salt(I-2000), Carvone salt(I-2005)~Carvone salt(I-2016), Carvone salt(I-2052)~Carvone salt(I-2061), Carvone salt(I-2091)~Carvone salt(I-2095), Carvone salt(I-2100)~Carvone salt(I-2111),Carboxylic acid salt (I-2147)~Carboxylic acid salt (I-2156), Carboxylic acid salt (I-2186)~Carboxylic acid salt (I-2190), Carboxylic acid salt (I-2195)~Carboxylic acid salt (I-2206), Carboxylic acid salt (I-2242)~Carboxylic acid salt (I-2251), Carboxylic acid salt (I-2281)~Carboxylic acid salt (I-2285), Carboxylic acid salt (I-2290)~Carboxylic acid salt (I-2301), Carboxylic acid salt (I-2337)~Carboxylic acid salt (I-2346), Carboxylic acid salt (I-2376)~Carboxylic acid salt (I-2380), Carboxylic acid salt (I-2385)~Carboxylic acid salt (I-2396), Carboxylic acid salt (I-2432)~Carboxylic acid salt (I-2441), Carboxylic acid salt (I-2471)~Carboxylic acid salt (I-2475), Carboxylic acid salt (I-2480)~Carboxylic acid salt (I-2491), Carboxylic acid salt (I-2527)~Carboxylic acid salt (I-2536), Carboxylic acid salt (I-2566)~Carboxylic acid salt (I-2570 ... Carboxylic acid salt (I-2575)~Carboxylic acid salt (I-2586), Carboxylic acid salt (I-2622)~Carboxylic acid salt (I-2631), Carboxylic acid salt (I-2661)~Carboxylic acid salt (I-2665), Carboxylic acid salt (I-2670)~Carboxylic acid salt (I-2681), Carboxylic acid salt (I-2717)~Carboxylic acid salt (I-2726), Carboxylic acid salt (I-2756)~Carboxylic acid salt (I-2760), Carboxylic acid salt (I-2765)~Carboxylic acid salt (I-2776), Carboxylic acid salt (I-2777), Carboxylic acid salt (I-2778), Carboxylic acid salt (I-2779), Carboxylic acid salt (I-2780), Carboxylic acid salt (I-2781), Carboxylic acid salt (I-2782), Carboxylic acid salt (I-2783), Carboxylic acid salt (I-2784), Carboxylic acid salt (I-2785), Carboxylic acid salt (I-2786), Carboxylic acid salt (I-2787), Carboxylic acid salt (I-2789), Carboxylic acid salt (I-2790), Carboxylic acid salt (I-2791), Carboxylic acid salt (I-2792), Carboxylic acid salt (I-2793), Carboxylic acid salt (I-2794), Carboxylic acid salt (I-2795), Carboxylic acid salt (I-2796), Carboxylic acid salt (I-2797), Carboxylic acid salt (I-2798), Carboxylic acid salt (I-2799), Carboxylic Acid Salt (I-2812) to Carboxylic Acid Salt (I-2821), Carboxylic Acid Salt (I-2851) to Carboxylic Acid Salt (I-2855), Carboxylic Acid Salt (I-2860) to Carboxylic Acid Salt (I-2871), Carboxylic Acid Salt (I-2907) to Carboxylic Acid Salt (I-2916), Carboxylic Acid Salt (I-2946) to Carboxylic Acid Salt (I-2950), Carboxylic Acid Salt (I-2955) to Carboxylic Acid Salt (I-2966), Carboxylic Acid Salt (I-3002) to Carboxylic Acid Salt (I-3011) are preferred.

[0065] <Method for producing salt (I)> The salt (I) can be produced by reacting a salt represented by the formula (Ia) with a salt represented by the formula (Ib) in a solvent. TIFF0007659418000035.tif97164 [wherein all symbols have the same meanings as defined above. RA , R B and R C each independently represents a hydrocarbon group having 1 to 12 carbon atoms, or R A , R B and R C may combine together to form an aromatic ring. D represents a hydrogen atom or a hydrocarbon group having 1 to 12 carbon atoms.] Examples of the solvent used in this reaction include chloroform, acetonitrile, and ion-exchanged water. The reaction temperature is usually 15° C. to 80° C., and the reaction time is usually 0.5 to 24 hours.

[0066] The salt represented by formula (Ib) can be synthesized with reference to the methods described in JP-A-2011-39502 and JP-A-2014-88367, and examples thereof include salts represented by the following formula (Ib). TIFF0007659418000036.tif133163

[0067] In the salt (Ia), R 1 , R 2 and R 3 But, -OL 1 -CO-OR 10 The salt represented by formula (I-a1) can be produced by reacting a salt represented by formula (Ic) with a compound represented by formula (Id) in a solvent in the presence of a base catalyst. TIFF0007659418000037.tif88165 [wherein all symbols have the same meanings as defined above.] The base includes potassium carbonate, potassium iodide, pyridine, triethylamine and the like. Examples of the solvent include chloroform, monochlorobenzene, dimethylformamide, acetonitrile, ethyl acetate, and water. The reaction temperature is usually 15° C. to 80° C., and the reaction time is usually 0.5 to 24 hours.

[0068] Examples of the compound represented by formula (Id) include the compounds represented by the following formulas, which are readily available on the market and can also be readily produced by known methods. TIFF0007659418000038.tif4191

[0069] The salt represented by formula (Ic) can be produced by reacting the salt represented by formula (Ie), a compound represented by formula (I-f1), a compound represented by formula (I-f2), and a compound represented by formula (I-f3) in a solvent in the presence of a catalyst. TIFF0007659418000039.tif69129 [wherein all symbols have the same meanings as defined above.] The catalyst includes potassium carbonate, sodium hydride, and the like. Examples of the solvent include chloroform, monochlorobenzene, acetonitrile, and water. The reaction temperature is usually 15° C. to 100° C., and the reaction time is usually 0.5 to 24 hours.

[0070] Examples of the salt represented by formula (Ie) include the salt represented by the following formula, which are readily available on the market. TIFF0007659418000040.tif73140

[0071] Examples of the compound represented by formula (I-f1), the compound represented by formula (I-f2), and the compound represented by formula (I-f3) include the compounds represented below, and are easily available on the market. TIFF0007659418000041.tif1562

[0072] The salt represented by formula (Ic) can also be produced by reacting the salt represented by formula (Ie), a compound represented by formula (I-f4), a compound represented by formula (I-f5), and a compound represented by formula (I-f6) in a solvent in the presence of potassium carbonate, followed by acid treatment. TIFF0007659418000042.tif69129 [wherein all symbols have the same meanings as defined above. R ac represents an acid labile group. Examples of the solvent include chloroform, monochlorobenzene, acetonitrile, and water. The reaction temperature is usually 15° C. to 100° C., and the reaction time is usually 0.5 to 24 hours. The acid includes p-toluenesulfonic acid, hydrochloric acid, and the like.

[0073] Examples of the compound represented by formula (I-f4), the compound represented by formula (I-f5), and the compound represented by formula (I-f6) include the compounds represented below, and are easily available on the market. TIFF0007659418000043.tif30134

[0074] In the salt (Ia), R 1 , R 2 and R 3 But -O-CO-R 10 The salt represented by formula (I-a2) can be produced by reacting a salt represented by formula (Ic) with a compound represented by formula (I-d2) in a solvent in the presence of a base catalyst. TIFF0007659418000044.tif93166 [wherein all symbols have the same meanings as defined above.] The base includes potassium carbonate, potassium iodide, pyridine, triethylamine and the like. Examples of the solvent include chloroform, monochlorobenzene, dimethylformamide, acetonitrile, ethyl acetate, and water. The reaction temperature is usually 15° C. to 80° C., and the reaction time is usually 0.5 to 24 hours.

[0075] Examples of compounds represented by formula (I-d2) include the compounds represented by the following formulas, which are readily available on the market or can be readily produced by known methods. TIFF0007659418000045.tif2399

[0076] In the salt (Ia), R 1 , R 2 and R 3 But -OR 10 The salt represented by formula (I-a3) can be produced by reacting a salt represented by formula (Ic) with a compound represented by formula (I-d3) in a solvent in the presence of a base catalyst. TIFF0007659418000046.tif94161 [wherein all symbols have the same meanings as defined above.] The base includes sodium hydroxide, potassium hydroxide, and the like. Examples of the solvent include chloroform, monochlorobenzene, dimethylformamide, acetonitrile, ethyl acetate, and water. The reaction temperature is usually 15° C. to 80° C., and the reaction time is usually 0.5 to 24 hours.

[0077] Examples of compounds represented by formula (I-d3) include the compounds represented by the following formulas, which are readily available on the market or can be readily produced by known methods. TIFF0007659418000047.tif23150

[0078] In the salt (Ia), R 1 , R 2 and R 3 But -O-CO-OR 10 The salt represented by formula (I-a4) can be produced by reacting a salt represented by formula (Ic) with a compound represented by formula (I-d3) in a solvent in the presence of carbonyldiimidazole. TIFF0007659418000048.tif94165 [wherein all symbols have the same meanings as defined above.] Examples of the solvent include chloroform, monochlorobenzene, dimethylformamide, acetonitrile, ethyl acetate, and water. The reaction temperature is usually 15° C. to 80° C., and the reaction time is usually 0.5 to 24 hours.

[0079] [Carboxylic Acid Generator] The carboxylic acid generator of the present invention is an acid generator containing a carboxylate (I). The carboxylate (I) of the present invention can act as an acid generator in a resist composition. When the carboxylate (I) is used as an acid generator in a resist composition, the acid generator may contain only one type or two or more types of the carboxylate (I). As described below, the acid generator of the present invention may further contain an acid generator other than the carboxylate (I) that is known in the resist field (hereinafter, may be referred to as "acid generator (B)") and / or a carboxylic acid generator other than the carboxylate (I) that is known in the resist field. The acid generator (B) may be used alone or in combination of two or more kinds. When the carboxylic acid generator of the present invention contains an acid generator (B) or the like, the content ratio of the carboxylate (I) to the acid generator (B) or the like (mass ratio; carboxylate (I):acid generator (B)) is usually 1:99 to 100:0, preferably 1:99 to 99:1, more preferably 2:98 to 98:2, and even more preferably 5:95 to 95:5.

[0080] [Resist Composition] The resist composition contains a carboxylic acid generator containing the carboxylate (I) of the present invention, an acid generator (B) other than the carboxylate (I), and a resin having an acid labile group (hereinafter sometimes referred to as "resin (A)"). The "acid labile group" here means a group that has a leaving group and that is released by contact with an acid to form a hydrophilic group (e.g., a hydroxy group or a carboxy group). The resist composition preferably further contains a quencher (hereinafter sometimes referred to as “quencher (C)”) and / or a solvent (hereinafter sometimes referred to as “solvent (E)”). In the resist composition of the present invention, the content of the carboxylate (I) is preferably from 0.1 to 35% by mass, more preferably from 0.5 to 30% by mass, and even more preferably from 1 to 25% by mass, relative to the solid content of the resist composition.

[0081] <Acid Generator (B)> The acid generator (B) may be either nonionic or ionic. Examples of 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. Examples of ionic acid generators include onium salts containing onium cations (e.g., diazonium salts, phosphonium salts, sulfonium salts, iodonium salts). Examples of anions of onium salts include sulfonate anion, sulfonylimide anion, sulfonylmethide anion, etc.

[0082] As the acid generator (B), compounds that generate acid by radiation, such as those 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. 3914407, and European Patent No. 126,712, can be used. Compounds produced by known methods can also be used. Two or more types of acid generators (B) can be used in combination.

[0083] 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)"). TIFF0007659418000049.tif2962[In formula (B1), Q b1 and Q b2each 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 the -CH 2 - may be replaced by -O- or -CO-, and 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 -CH 2 -, -O-, -SO 2 It may be replaced by - or -CO-. Z + represents an organic cation.

[0084] 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 preferably each independently a fluorine atom or a trifluoromethyl group, and more preferably both are fluorine atoms.

[0085] 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 be a group formed by combining two or more of these groups. Specific examples of such straight-chain alkanediyl groups include 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 groups; 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 of the polycyclic divalent alicyclic saturated hydrocarbon groups include norbornane-1,4-diyl group, norbornane-2,5-diyl group, adamantane-1,5-diyl group, and adamantane-2,6-diyl group.

[0086] L b1 -CH contained in a divalent saturated hydrocarbon group represented by 2 Examples of the group in which - is replaced by -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 represented by formulas (b1-4) to (b1-11), * and ** represent bonding positions, and * represents bonding position with -Y.

[0087] TIFF0007659418000050.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, a hydrogen atom contained in the saturated hydrocarbon group may be substituted with a fluorine atom or a hydroxyl group, and -CH 2 - may be replaced by -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, a hydrogen atom contained in the saturated hydrocarbon group may be substituted with a fluorine atom or a hydroxyl group, and -CH 2 - may be replaced by -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, a hydrogen atom contained in the saturated hydrocarbon group may be substituted with a fluorine atom or a hydroxyl group, and -CH 2 - may be replaced by -O- or -CO-. However, L b6 and L b7 The total number of carbon atoms is 23 or less.

[0088] In the groups represented by formulae (b1-1) to (b1-3), —CH 2 When - is replaced with -O- or -CO-, the number of carbon atoms before the replacement is regarded as the number of carbon atoms of the saturated hydrocarbon group. As the divalent saturated hydrocarbon group, L b1 The divalent saturated hydrocarbon group may be the same as that of the above.

[0089] 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, a hydrogen atom contained in the saturated hydrocarbon group may be substituted with a fluorine atom or a hydroxyl group, and -CH contained in the divalent saturated hydrocarbon group is 2 - may be replaced by -O- or -CO-.

[0090] L b1 -CH contained in a divalent saturated hydrocarbon group represented by 2 The group in which - is replaced by -O- or -CO- is preferably a group represented by formula (b1-1) or formula (b1-3).

[0091] Examples of the group represented by formula (b1-1) include the groups represented by formulas (b1-4) to (b1-8). TIFF0007659418000051.tif48120[In formula (b1-4), Lb8 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 the -CH 2 - may be replaced by -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 the -CH 2 - may be replaced by -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), Lb16 represents a divalent saturated hydrocarbon group having 1 to 18 carbon atoms, and the -CH 2 - may be replaced by -O- or -CO-. L b17 represents 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.

[0092] 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 b18is 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.

[0093] Examples of the group represented by formula (b1-3) include the groups represented by formulas (b1-9) to (b1-11). TIFF0007659418000052.tif23140[In 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 hydroxyl group, or an alkylcarbonyloxy group. 2 - may be replaced by -O- or -CO-, and a hydrogen atom contained in the alkylcarbonyloxy group may be replaced by 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 hydroxyl group, or an alkylcarbonyloxy group. 2 - may be replaced by -O- or -CO-, and a hydrogen atom contained in the alkylcarbonyloxy group may be replaced by a hydroxy group. However, L b21 , Lb22 and L b23 The total number of carbon atoms is 21 or less. In formula (b1-11), L b24 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. 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 hydroxyl group, or an alkylcarbonyloxy group. 2 - may be replaced by -O- or -CO-, and a hydrogen atom contained in the alkylcarbonyloxy group may be replaced by a hydroxy group. However, L b24 , L b25 and L b26 The total number of carbon atoms is 21 or less.

[0094] 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.

[0095] Examples of the alkylcarbonyloxy group include an acetyloxy group, a propionyloxy group, a butyryloxy group, a cyclohexylcarbonyloxy group, and an adamantylcarbonyloxy group.

[0096] Examples of the group represented by formula (b1-4) include the following. TIFF0007659418000053.tif16154

[0097] Examples of the group represented by formula (b1-5) include the following. TIFF0007659418000054.tif68152

[0098] Examples of the group represented by formula (b1-6) include the following. TIFF0007659418000055.tif32164

[0099] Examples of the group represented by formula (b1-7) include the following. TIFF0007659418000056.tif57146

[0100] Examples of the group represented by formula (b1-8) include the following. TIFF0007659418000057.tif23150

[0101] Examples of the group represented by formula (b1-2) include the following. TIFF0007659418000058.tif31161

[0102] Examples of the group represented by formula (b1-9) include the following. TIFF0007659418000059.tif44137

[0103] Examples of the group represented by formula (b1-10) include the following. TIFF0007659418000060.tif92165

[0104] Examples of the group represented by formula (b1-11) include the following. TIFF0007659418000061.tif84164

[0105] Examples of the alicyclic hydrocarbon group represented by Y include groups represented by formulae (Y1) to (Y11) and (Y36) to (Y38). -CH contained in the alicyclic hydrocarbon group represented by Y 2 -O-, -SO 2When it is replaced by - or -CO-, the number may be 1 or may be 2 or more. Examples of such a group include groups represented by formulae (Y12) to (Y35) and (Y39) to (Y43). TIFF0007659418000062.tif82166

[0106] The alicyclic hydrocarbon group represented by Y is preferably a group represented by any one of the formulae (Y1) to (Y20), (Y26), (Y27), (Y30), (Y31), (Y39) to (Y43), more preferably a group represented by the formula (Y11), (Y15), (Y16), (Y20), (Y26), (Y27), (Y30), (Y31), (Y39), (Y40), (Y42) or (Y43), and still more preferably a group represented by the formula (Y11), (Y15), (Y20), (Y26), (Y27), (Y30), (Y31), (Y39), (Y40), (Y42) or (Y43). When the alicyclic hydrocarbon group represented by Y is a spiro ring 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. In addition, among the alkanediyl groups contained in the ketal structure, it is preferable that the methylene group adjacent to the oxygen atom is not substituted with a fluorine atom.

[0107] 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, -(CH 2 ) ja -CO-OR b1 Group or -(CH 2 ) 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 combination thereof. ja represents an integer of 0 to 4. -CH contained in the alkyl group and the alicyclic hydrocarbon group2 -, -O-, -SO 2 - or -CO-, and a hydrogen atom contained in the alkyl group, the alicyclic hydrocarbon group and the aromatic hydrocarbon group may be replaced by a hydroxy group or a fluorine atom. The substituent of the alicyclic hydrocarbon group represented by Y is a halogen atom, a hydroxy group, an alkyl group having 1 to 16 carbon atoms which may be substituted with a hydroxy group (including —CH 2 - may be replaced by -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, -(CH 2 ) ja -CO-OR b1 Group or -(CH 2 ) 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 combination thereof. ja represents an integer of 0 to 4. -CH contained in the alkyl group and the alicyclic hydrocarbon group 2 -, -O-, -SO 2 - or -CO-, and a hydrogen atom contained in the alkyl group, the alicyclic hydrocarbon group and the aromatic hydrocarbon group may be replaced by a hydroxy group or a fluorine atom.

[0108] 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, and examples of the chain include a methylcyclohexyl group and 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 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. 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 with 1 to 18 carbon atoms (tolyl group, xylyl group, cumenyl group, mesityl group, p-methylphenyl group, p-ethylphenyl group, p-tert-butylphenyl group, 2,6-diethylphenyl group, 2-methyl-6-ethylphenyl group, etc.) and aromatic hydrocarbon groups having an alicyclic hydrocarbon group with 3 to 18 carbon atoms (p-cyclohexylphenyl group, p-adamantylphenyl group, etc.). The number of carbon atoms in the aromatic hydrocarbon group is preferably 6 to 14, and more preferably 6 to 10. 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 further 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. -CH in the alkyl group 2 -O-, -SO 2 Examples of the group substituted with - or -CO- include an alkoxy group, an alkylsulfonyl 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 further preferably 1 to 4. Examples of the alkylsulfonyl group include a methylsulfonyl group, an ethylsulfonyl group, a propylsulfonyl group, etc. The alkylsulfonyl group preferably has 2 to 12 carbon atoms, more preferably 2 to 6 carbon atoms, and further preferably 2 to 4 carbon atoms. Examples of the alkoxycarbonyl group include a methoxycarbonyl group, an ethoxycarbonyl group, a butoxycarbonyl group, etc. The number of carbon atoms in the alkoxycarbonyl group is preferably 2 to 12, more preferably 2 to 6, and further preferably 2 to 4. Examples of the alkylcarbonyl group include an acetyl group, a propionyl group, a butyryl group, etc. The number of carbon atoms in the alkylcarbonyl group is preferably 2 to 12, more preferably 2 to 6, and further preferably 2 to 4. Examples of the alkylcarbonyloxy group include an acetyloxy group, a propionyloxy group, a butyryloxy group, etc. The number of carbon atoms in the alkylcarbonyloxy group is preferably 2 to 12, more preferably 2 to 6, and further preferably 2 to 4. Examples of the combined group include a group that combines an alkoxy group with an alkyl group, a group that combines an alkoxy group with an alkoxy group, a group that combines an alkoxy group with an alkylcarbonyl group, and a group that combines an alkoxy group with an alkylcarbonyloxy group. Examples of the group formed by combining an alkoxy group with 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 further preferably 2 to 4. Examples of the 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 further preferably 2 to 4. Examples of the group formed by combining an alkoxy group with 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 further preferably 3 to 5. Examples of the group formed by combining an alkoxy group with 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 further preferably 3 to 5. -CH contained in alicyclic hydrocarbon group 2 -O-, -SO 2 Examples of the group replaced with - or -CO- or the like include groups represented by formulae (Y12) to (Y35) and (Y39) to (Y43).

[0109] Y includes the following: TIFF0007659418000063.tif103165

[0110] TIFF0007659418000064.tif65160

[0111] Y is preferably an alicyclic hydrocarbon group having 3 to 24 carbon atoms which may have a substituent, more preferably an alicyclic hydrocarbon group having 3 to 20 carbon atoms which may have a substituent, even more preferably an alicyclic hydrocarbon group having 3 to 18 carbon atoms which may have a substituent, and even more preferably an adamantyl group which may have a substituent, and -CH 2 - is -CO-, -SO 2 Y may be replaced by - or -CO-. Specifically, Y is preferably an adamantyl group, a hydroxyadamantyl group, an oxoadamantyl group, or a group represented by the formulae (Y42) and (Y100) to (Y114).

[0112] 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, may be 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), (B1-A-9), (B1-A-10), (B1-A-24) to formula (B1-A-33), (B1-A-36) to formula (B1-A-40), and (B1-A-47) to formula (B1-A-59). TIFF0007659418000065.tif87161

[0113] TIFF0007659418000066.tif120159

[0114] TIFF0007659418000067.tif100154

[0115] TIFF0007659418000068.tif64161

[0116] TIFF0007659418000069.tif111141

[0117] TIFF0007659418000070.tif86165

[0118] TIFF0007659418000071.tif100160

[0119] Here, 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 L 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. A4Q is a single bond or an alkanediyl group having 1 to 4 carbon atoms. 1 and Q 2 has the same meaning as above. Specific examples of the anion represented by formula (IA) include the anions described in JP-A-2010-204646.

[0120] Preferred anions in the salt represented by formula (B1) include the anions represented by formulas (B1a-1) to (B1a-38). TIFF0007659418000072.tif208160

[0121] TIFF0007659418000073.tif168155

[0122] Of these, anions represented by any of Formulae (B1a-1) to (B1a-3), (B1a-7) to (B1a-16), (B1a-18), (B1a-19), and (B1a-22) to (B1a-38) are preferred.

[0123] Z1 + Examples of the organic cation include organic onium cation, organic sulfonium cation, organic iodonium cation, organic ammonium cation, benzothiazolium cation, and organic phosphonium cation. Among these, organic sulfonium cation and organic iodonium cation are preferred, and arylsulfonium cation is 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). TIFF0007659418000074.tif45166In equations (b2-1) to (b2-4), R b4 ~R b6each 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 may be bonded to each other to form a ring together with the sulfur atom to which they are bonded, and the -CH 2 - may be replaced by -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 b7 may 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 may be bonded to each other to form a ring together with the sulfur atom to which they are bonded, and the -CH 2 - may be replaced by -O-, -S- or -CO-. R b11represents a hydrogen atom, a chain hydrocarbon group having 1 to 36 carbon atoms, an alicyclic hydrocarbon group having 3 to 36 carbon atoms, or an aromatic hydrocarbon group having 6 to 18 carbon atoms. R b12 represents an open 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, a hydrogen atom contained in the open chain hydrocarbon group may be substituted with an aromatic hydrocarbon group having 6 to 18 carbon atoms, and a hydrogen atom contained in the aromatic hydrocarbon group may be substituted with an alkoxy group having 1 to 12 carbon atoms or an alkylcarbonyloxy group having 1 to 12 carbon atoms. R b11 and R b12 may be bonded to each other to form a ring including the -CH-CO- to which they are bonded, and the -CH 2 - 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 R b14 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. 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: TIFF0007659418000075.tif10159 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. 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 of such groups 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 further preferably 1 to 4. Examples of the aromatic hydrocarbon group include aryl groups such as a phenyl group, a biphenylyl group, a naphthyl group, and a phenanthryl group. 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 with 1 to 18 carbon atoms (tolyl group, xylyl group, cumenyl group, mesityl group, p-ethylphenyl group, p-tert-butylphenyl group, 2,6-diethylphenyl group, 2-methyl-6-ethylphenyl group, etc.) and aromatic hydrocarbon groups having an alicyclic hydrocarbon group with 3 to 18 carbon atoms (p-cyclohexylphenyl group, p-adamantylphenyl group, etc.). When the aromatic hydrocarbon group has a chain hydrocarbon group or an alicyclic hydrocarbon group, a chain hydrocarbon group having 1 to 18 carbon atoms and an alicyclic hydrocarbon group having 3 to 18 carbon atoms are preferred. An example of the aromatic hydrocarbon group in which a hydrogen atom is substituted with an alkoxy group is a p-methoxyphenyl group. Examples of the chain hydrocarbon group in which a hydrogen atom has been substituted with an aromatic hydrocarbon group include aralkyl groups such as a benzyl group, a phenethyl group, a phenylpropyl group, a trityl group, a naphthylmethyl group, and a naphthylethyl group. Examples of the alkoxy group include a methoxy group, an ethoxy group, a propoxy group, a butoxy group, a pentyloxy group, a hexyloxy group, a heptyloxy group, an octyloxy group, a decyloxy group, and a dodecyloxy group. Examples of the 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. R b4 and R b5The ring formed by bonding to each other together with the sulfur atom to which they are bonded may be any of monocyclic, polycyclic, aromatic, non-aromatic, saturated and unsaturated rings. Examples of this ring include rings having 3 to 18 carbon atoms, and preferably rings having 4 to 18 carbon atoms. Examples of the ring containing a sulfur atom include 3-membered to 12-membered rings, and preferably 3-membered to 7-membered rings, and examples of such rings include the following rings. * represents a bonding position. TIFF0007659418000076.tif23144R 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-membered to 12-membered ring, preferably a 3-membered to 7-membered ring. For example, it may be a thiolane-1-ium ring (tetrahydrothiophenium ring), a thiane-1-ium ring, a 1,4-oxathiane-4-ium ring, etc. R b11 and R b12 The ring formed by combining with may be any of monocyclic, polycyclic, aromatic, non-aromatic, saturated and unsaturated rings. The ring may be a 3-membered to 12-membered ring, preferably a 3-membered to 7-membered ring. Examples of the ring include an oxocycloheptane ring, an oxocyclohexane ring, an oxonorbornane ring, and an oxoadamantane ring.

[0124] Among the cations (b2-1) to (b2-4), the cation (b2-1) is preferred. Examples of the cation (b2-1) include the following cations. TIFF0007659418000077.tif73149

[0125] TIFF0007659418000078.tif109165

[0126] Examples of the cation (b2-2) include the following cations. TIFF0007659418000079.tif18150

[0127] Examples of the cation (b2-3) include the following cations. TIFF0007659418000080.tif24126

[0128] Examples of the cation (b2-4) include the following cations. TIFF0007659418000081.tif127166

[0129] The acid generator (B) is a combination of the above-mentioned anion and the above-mentioned organic cation, which can be combined arbitrarily. The acid generator (B) is preferably a combination of an anion 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) and a cation (b2-1), a cation (b2-3), or a cation (b2-4).

[0130] The acid generator (B) is preferably one represented by formula (B1-1) to formula (B1-56). Among them, those containing an arylsulfonium cation are preferred, and those represented by formula (B1-1) to formula (B1-3), formula (B1-5) to formula (B1-7), formula (B1-11) to formula (B1-14), formula (B1-20) to formula (B1-26), formula (B1-29), and formula (B1-31) to formula (B1-56) are particularly preferred. TIFF0007659418000082.tif87150

[0131] TIFF0007659418000083.tif145158

[0132] TIFF0007659418000084.tif92153

[0133] TIFF0007659418000085.tif127143 TIFF0007659418000086.tif62163

[0134] TIFF0007659418000087.tif92158

[0135] In the resist composition of the present invention, the content of the acid generator (B) is preferably from 1 to 45 parts by mass, more preferably from 1 to 40 parts by mass, and even more preferably from 3 to 35 parts by mass, relative to 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.

[0136] <Resin (A)> Resin (A) has a structural unit having an acid labile group (hereinafter, sometimes referred to as "structural unit (a1)"). Resin (A) preferably further contains a structural unit other than the structural unit (a1). Examples of structural units other than the structural unit (a1) include a structural unit not having an acid labile group (hereinafter, sometimes referred to as "structural unit (s)"), structural units other than the structural unit (a1) and the structural unit (s) (for example, a structural unit having a halogen atom (hereinafter, sometimes referred to as "structural unit (a4)") described below, a structural unit having a non-leaving hydrocarbon group (hereinafter, sometimes referred to as "structural unit (a5)") described below, and other structural units derived from monomers known in the art.

[0137] <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)). TIFF0007659418000088.tif2397 [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 combination thereof, or R a1 and R a2are bonded to each other to form, together with the carbon atom to which they are bonded, an alicyclic hydrocarbon group having 3 to 20 carbon atoms. ma and na each independently represent 0 or 1, and at least one of ma and na represents 1. * indicates the bond position.] TIFF0007659418000089.tif2379 [In formula (2), R a1’ and R a2’ each independently represents a hydrogen atom or a hydrocarbon group having 1 to 12 carbon atoms; R a3’ represents a hydrocarbon group having 1 to 20 carbon atoms, or R a2’ and R a3’ are bonded to each other to form a heterocyclic group having 3 to 20 carbon atoms together with the carbon atom to which they are bonded and X, and the —CH 2 - may be replaced by -O- or -S-. X represents an oxygen atom or a sulfur atom. na′ represents 0 or 1. * represents a bond.]

[0138] 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 , R a2 and R a3 Examples of the alkenyl group in include an ethenyl group, a propenyl group, an isopropenyl group, a butenyl group, an isobutenyl group, a tert-butenyl group, a pentenyl group, a hexenyl group, a heptenyl group, an octynyl group, an isooctynyl group, and a nonenyl group. R a1 , R a2 and R a3The 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 (where * represents a bond): a1 , R a2 and R a3 The alicyclic hydrocarbon group preferably has 3 to 16 carbon atoms. TIFF0007659418000090.tif10159R a1 , R a2 and R a3 Examples of the aromatic hydrocarbon group in 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 combining the above-mentioned alkyl group and alicyclic hydrocarbon group (e.g., alkylcycloalkyl group or cycloalkylalkyl group), aralkyl groups such as benzyl group, aromatic hydrocarbon groups having an alkyl group (p-methylphenyl group, p-tert-butylphenyl group, tolyl group, xylyl group, cumenyl group, mesityl group, 2,6-diethylphenyl group, 2-methyl-6-ethylphenyl group, etc.), aromatic hydrocarbon groups having an alicyclic hydrocarbon group (p-cyclohexylphenyl group, p-adamantylphenyl group, etc.), aryl-cycloalkyl groups such as phenylcyclohexyl group, etc. Preferably, ma is 0 and na is 1. R a1 and R a2 When they are bonded to each other to form an alicyclic hydrocarbon group, -C(R a1 )(R a2 )(R a3 ) includes the following groups. The alicyclic hydrocarbon group preferably has 3 to 12 carbon atoms. * represents the bonding position with -O-. TIFF0007659418000091.tif31135

[0139] 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 R a1 , R a2 and R a3 Examples of the groups include the same groups 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 combining the above-mentioned alkyl group with an alicyclic hydrocarbon group (for example, an alkylcycloalkyl group or a cycloalkylalkyl group), an aralkyl group (benzyl group, etc.), an aromatic hydrocarbon group having an alkyl group (p-methylphenyl group, p-tert-butylphenyl group, tolyl group, xylyl group, cumenyl group, mesityl group, 2,6-diethylphenyl group, 2-methyl-6-ethylphenyl group, etc.), an aromatic hydrocarbon group having an alicyclic hydrocarbon group (p-cyclohexylphenyl group, p-adamantylphenyl group, etc.), an alicyclic hydrocarbon group having an aromatic hydrocarbon group (phenylcyclohexyl group, etc.), and the like. R a2’ and R a3’ When they are bonded to each other to form a heterocyclic group together with the carbon atom to which they are bonded and X, -C(R a1’ )(R a2’ )-XR a3’ Examples of the group include the following: * represents the bonding position. TIFF0007659418000092.tif21142R a1’ and R a2’ At least one of these is preferably a hydrogen atom. na' is preferably 0.

[0140] 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. As the group, a tert-butoxycarbonyl group is preferable. In formula (1), R a1 , R a2 together with the carbon atom to which they are attached form an adamantyl group, R a3 is an alkyl group, ma=0, and na=1. In formula (1), R a1 and R a2 are each independently an alkyl group; R a3 is an adamantyl group, ma=0, and na=1. Specific examples of the group (1) include the following groups. * represents a bond. TIFF0007659418000093.tif171163

[0141] Specific examples of the group (2) include the following groups. * represents the bonding position. TIFF0007659418000094.tif74154

[0142] 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.

[0143] Of the (meth)acrylic monomers having an acid labile group, preferred are those having an alicyclic hydrocarbon group having 5 to 20 carbon atoms. By using a resin (A) having a structural unit derived from a monomer (a1) having a bulky structure such as an alicyclic hydrocarbon group in a resist composition, the resolution of the resist pattern can be improved.

[0144] Examples of the structural unit derived from the (meth)acrylic monomer having the 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 the structural unit (a1-1) and the structural unit (a1-2). These may be used alone or in combination of two or more. TIFF0007659418000095.tif41139 [In formula (a1-0), formula (a1-1) and formula (a1-2), L a01 , L a1 and L a2 each independently represents -O- or * -O-(CH 2 ) k1 It represents --CO--O--, k1 represents an integer of 1 to 7, and * represents a bond to --CO--. R a01 , R a4 and R a5 each independently represents a hydrogen atom, a halogen atom or an alkyl group having 1 to 6 carbon atoms which may have a halogen atom. R a02 , R a03 and R a04 each independently represents an alkyl group having 1 to 8 carbon atoms, an alicyclic hydrocarbon group having 3 to 18 carbon atoms, an aromatic hydrocarbon group having 6 to 18 carbon atoms, or a combination thereof. 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.

[0145] Ra01 , R a4 and R a5 is preferably a hydrogen atom or a methyl group, and more preferably a methyl group. L a01 , L a1 and L a2 is preferably an oxygen atom or -O-(CH 2 ) 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 and R a04 The alkyl group, the alicyclic hydrocarbon group, the aromatic hydrocarbon group, and the combination thereof in the formula (1) are R a1 ~R a3 Examples of the groups include the same groups as those listed in the above. R a6 and R a7 The alkyl group, alkenyl group, alicyclic hydrocarbon group, aromatic hydrocarbon group, and combinations thereof in the formula (1) include 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 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 and Ra04 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 is 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.

[0146] Examples of the structural unit (a1-0) include a structural unit 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, a halogen atom, a haloalkyl group or another alkyl group. Of these, structural units represented by any of formulas (a1-0-1) to (a1-0-10), (a1-0-13) and (a1-0-14) are preferred. TIFF0007659418000096.tif99167

[0147] Examples of the structural unit (a1-1) include structural units derived from monomers described in JP 2010-204646 A. Among them, structural units represented by any one of formulas (a1-1-1) to (a1-1-7) and R in the structural unit (a1-1) are a4 In the above formula (a1-1-1), a methyl group is replaced with a hydrogen atom, a halogen atom, a haloalkyl group or another alkyl group. In the above formula (a1-1-2), a methyl group is replaced with a hydrogen atom, a halogen atom, a haloalkyl group or another alkyl group. In the above formula (a1-1-3), a methyl group is replaced with a hydrogen atom, a halogen atom, a haloalkyl group or another alkyl group. In the above formula (a1-1-4), a structural unit is more preferred. TIFF0007659418000097.tif39167

[0148] 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 in which a methyl group corresponding to the formula (a1-2-2), (a1-2-5), (a1-2-6), and (a1-2-10) to (a1-2-12) are replaced with a hydrogen atom, a halogen atom, a haloalkyl group, or another alkyl group. TIFF0007659418000098.tif75156

[0149] When the resin (A) contains the structural unit (a1-0), the content thereof is usually 5 to 60 mol %, preferably 5 to 50 mol %, and more preferably 10 to 40 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 10 to 95 mol %, preferably 15 to 85 mol %, more preferably 15 to 80 mol %, even more preferably 20 to 80 mol %, and still more preferably 20 to 75 mol %, based on all structural units in the resin (A).

[0150] An example of the structural unit (a1) having a group (2) is a structural unit represented by formula (a1-4) (hereinafter, sometimes referred to as "structural unit (a1-4)"). TIFF0007659418000099.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 - stands for -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 an integer of 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 a divalent hydrocarbon group having 2 to 20 carbon atoms together with the -CO- to which they are bonded, and the -CH 2 - may be replaced by -O- or -S-.

[0151] R a32 and R a33 Examples of the halogen atom in 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 further 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 further preferably a methoxy group. R a33 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 2 to 8 carbon atoms, more preferably a methoxymethyl group or an ethoxyethyl group, and further 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 2 to 8 carbon atoms, and more preferably a methoxyethyl group or an ethoxyethyl group. R a33 Examples of the alkylcarbonyl group in 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 In the above formula, examples of the alkylcarbonyloxy group include an acetyloxy group, a propionyloxy group, and a butyryloxy group. The alkylcarbonyloxy group is preferably an alkylcarbonyloxy group having 2 to 3 carbon atoms, and more preferably an acetyloxy group. R 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 further preferably a fluorine atom, an iodine atom, a hydroxy group, a methyl group, a methoxy group, or an ethoxyethoxy group.

[0152] *-X a31 -(A a32 -X a32 ) nc- includes *-O-, *-CO-O-, *-O-CO-, *-CO-OA a32 -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 well known. a32 -CO-O- or *-OA a32 -CO-O- is preferred.

[0153] Examples of the alkanediyl group 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.

[0154] A a30 is a single bond, *-CO-O- or *-CO-OA a32 -CO-O- is preferred, and a single bond, *-CO-O- or *-CO-O-CH 2 It is more preferably -CO-O-, and further preferably a single bond or *-CO-O-.

[0155] la is preferably 0, 1 or 2, more preferably 0 or 1, and even more preferably 0. 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 the monocyclic alicyclic hydrocarbon group include cycloalkyl groups such as cyclopentyl, cyclohexyl, cycloheptyl, and cyclooctyl. Examples of the polycyclic alicyclic hydrocarbon group include decahydronaphthyl, adamantyl, and norbornyl groups, as well as the following groups (* indicates a bonding site): TIFF0007659418000100.tif10151 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 combining the above-mentioned alkyl group and alicyclic hydrocarbon group (e.g., cycloalkylalkyl group), aralkyl groups such as benzyl group, aromatic hydrocarbon groups having an alkyl group (p-methylphenyl group, p-tert-butylphenyl group, tolyl group, xylyl group, cumenyl group, mesityl group, 2,6-diethylphenyl group, 2-methyl-6-ethylphenyl group, etc.), aromatic hydrocarbon groups having an alicyclic hydrocarbon group (p-cyclohexylphenyl group, p-adamantylphenyl group, etc.), and aryl-cycloalkyl groups such as phenylcyclohexyl group. In particular, R a36 Examples of the alkyl 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 groups.

[0156] R a34 is preferably a hydrogen atom. R a35 is preferably a hydrogen atom, an alkyl group having 1 to 12 carbon atoms, or an alicyclic hydrocarbon group having 3 to 12 carbon atoms, 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. a36The alkyl group and the 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.

[0157] -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-position or p-position of the benzene ring, and more preferably bonded to the p-position.

[0158] Examples of the structural unit (a1-4) include structural units derived from monomers described in JP 2010-204646 A. Preferably, the structural units represented by formulas (a1-4-1) to (a1-4-18) and R in the structural unit (a1-4) are a32 and more preferably, the structural units represented by formulae (a1-4-1) to (a1-4-5), (a1-4-10), (a1-4-13), and (a1-4-14), respectively. TIFF0007659418000101.tif100166 When resin (A) has structural unit (a1-4), its content is preferably 5 to 60 mol %, more preferably 5 to 50 mol %, and even more preferably 10 to 40 mol %, based on the total of all structural units in resin (A).

[0159] An example of a structural unit derived from a (meth)acrylic monomer having the group (2) is a structural unit represented by formula (a1-5) (hereinafter, may be referred to as "structural unit (a1-5)"). TIFF0007659418000102.tif4354 formula (a1-5), R a8represents an alkyl group having 1 to 6 carbon atoms which may have a halogen atom, a hydrogen atom, or a halogen atom. Z a1 is a single bond or *-(CH 2 ) h3 -CO-L 54 -, h3 represents an integer of 1 to 4, * represents L 51 represents the bonding position 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.

[0160] Examples of the halogen atom include a fluorine atom and a chlorine atom, with a fluorine atom 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. L 52 and L 53 Of these, it is preferred that one is -O- and the other is -S-. It is preferable that s1 is 1. s1' is preferably an integer of 0 to 2. Z a1 is a single bond or -CH 2 -CO-O- is preferred.

[0161] Examples of the structural unit (a1-5) include structural units derived from monomers described in JP 2010-61117 A. Among them, the structural units represented by formulae (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. TIFF0007659418000103.tif34138 When resin (A) has 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 all structural units of resin (A).

[0162] Further, examples of the structural unit (a1) include the following structural units. TIFF0007659418000104.tif27160 When the resin (A) contains the above structural unit, the content thereof is preferably from 5 to 60 mol %, more preferably from 5 to 50 mol %, and even more preferably from 10 to 40 mol %, based on the total structural units of the resin (A).

[0163] Structural unit(s) The structural unit (s) is derived from a monomer having no acid labile group (hereinafter, may be referred to as "monomer (s)"). As the monomer from which the structural unit (s) is derived, a monomer having no acid labile group known in the resist field can be used. The structural unit (s) preferably has a hydroxy group or a lactone ring. The use of a resin having a structural unit having a hydroxy group and no acid labile group (hereinafter sometimes referred to as "structural unit (a2)") and / or a structural unit having a lactone ring and no acid labile group (hereinafter sometimes referred to as "structural unit (a3)") in the resist composition of the present invention can improve the resolution of the resist pattern and the adhesion to the substrate.

[0164] <Structural unit (a2)> The hydroxy group contained in the structural unit (a2) may be an alcoholic hydroxy group or a phenolic hydroxy group. When a resist pattern is produced from the resist composition of the present invention, when a high energy ray such as a KrF excimer laser (248 nm), an electron beam, or EUV (extreme ultraviolet light) is used as an exposure light source, the structural unit (a2) having a phenolic hydroxyl group is preferable, and the structural unit (a2-A) described below is more preferable. When an ArF excimer laser (193 nm) or the like is used, the structural unit (a2) having an alcoholic hydroxyl group is preferable, and the structural unit (a2-1) described below is more preferable. The structural unit (a2) may contain one type alone or two or more types.

[0165] In the structural unit (a2), an example of a structural unit having a phenolic hydroxy group is a structural unit represented by formula (a2-A) (hereinafter, may be referred to as "structural unit (a2-A)"). TIFF0007659418000105.tif4247[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 - stands for -R. a50 represents the bond position with respect to the carbon atom to which it is bonded. A a52 each independently 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.]

[0166] R a50 and R a51 Examples of the halogen atom in 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 further 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 further 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 further preferably a methoxy group. R a51Examples 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 2 to 8 carbon atoms, more preferably a methoxymethyl group or an ethoxyethyl group, and further preferably a methoxymethyl group. R a51 In the above, examples of the alkoxyalkoxy group include a methoxymethoxy group, a methoxyethoxy group, an ethoxymethoxy group, an ethoxyethoxy group, a propoxymethoxy group, an isopropoxymethoxy group, a butoxymethoxy group, a sec-butoxymethoxy group, and a tert-butoxymethoxy group. The alkoxyalkoxy group is preferably an alkoxyalkoxy group having 2 to 8 carbon atoms, and more preferably a methoxyethoxy group or an ethoxyethoxy group. R a51 Examples of the alkylcarbonyl group in 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 a51 In the above formula, examples of the alkylcarbonyloxy group include an acetyloxy group, a propionyloxy group, and a butyryloxy group. The alkylcarbonyloxy group is preferably an alkylcarbonyloxy group having 2 to 3 carbon atoms, and more preferably an acetyloxy group. 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 further preferably a fluorine atom, an iodine atom, a hydroxy group, a methyl group, a methoxy group, or an ethoxyethoxy group.

[0167] *-X a51 -(A a52 -X a52 ) nb- includes *-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 well known. a52 -CO-O- or *-OA a52 -CO-O- is preferred. Examples of the alkanediyl group 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, and a single bond, *-CO-O- or *-CO-O-CH 2 It is more preferably -CO-O-, and further preferably a single bond or *-CO-O-. mb is preferably 0, 1 or 2, more preferably 0 or 1, and particularly preferably 0. The hydroxy group is preferably bonded to the ortho- or para-position of the benzene ring, and more preferably to the para-position.

[0168] Examples of the structural unit (a2-A) include structural units derived from monomers described in JP-A-2010-204634 and JP-A-2012-12577. The structural unit (a2-A) includes structural units represented by formulae (a2-2-1) to (a2-2-16) and R in the structural unit (a2-A) in the structural units represented by formulae (a2-2-1) to (a2-2-16). a50The 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 (a2-2-8), a structural unit represented by formula (a2-2-12) to (a2-2-14), and 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 formula (a2-2-12) to (a2-2-14), a50 In the structural unit represented by formula (a2-2-3), the structural unit represented by formula (a2-2-8), the structural unit represented by formula (a2-2-12) to formula (a2-2-14), and the structural unit represented by formula (a2-2-3) or the structural unit represented by formula (a2-2-8), and the structural unit represented by formula (a2-2-12) to formula (a2-2-14), R in the structural unit (a2-A) is preferably a structural unit represented by formula (a2-B), a50 In the structural unit represented by formula (a2-2-8) and the structural unit represented by formula (a2-2-8), R in the structural unit (a2-A) is more preferably a structural unit in which a methyl group corresponding to a50 It is more preferable that the structural unit is a structural unit in which a methyl group corresponding to the following formula is replaced with a hydrogen atom. TIFF0007659418000106.tif63169 When the structural unit (a2-A) is contained in the resin (A), the content of the structural unit (a2-A) is preferably 5 to 80 mol %, more preferably 10 to 70 mol %, even more preferably 15 to 65 mol %, and still more preferably 20 to 65 mol %, based on all structural units. The structural unit (a2-A) can be incorporated into the resin (A) by, for example, polymerizing the structural unit (a1-4) and then treating 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) and then treating with an alkali such as tetramethylammonium hydroxide.

[0169] 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)"). TIFF0007659418000107.tif4159 formula (a2-1), L a3 is -O- or * -O-(CH 2 ) k2 represents -CO-O-, k2 represents an integer of any one 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.

[0170] In formula (a2-1), L a3 is preferably -O-, -O-(CH 2 ) 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.

[0171] 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. TIFF0007659418000108.tif54149 When 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 2 to 20 mol %, and still more preferably 2 to 10 mol %, based on all structural units of resin (A).

[0172] <Structural unit (a3)> The lactone ring of the structural unit (a3) ​​may be a monocyclic ring such as a β-propiolactone ring, a γ-butyrolactone ring, or a δ-valerolactone ring, or may be a condensed ring of a monocyclic lactone ring and another ring. 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)). The structural unit (a3) ​​is preferably a structural unit represented by formula (a3-1), (a3-2), (a3-3) or (a3-4). One of these may be contained alone, or two or more of them may be contained. TIFF0007659418000109.tif51161 [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-(CH 2 ) k3 It represents a group represented by -CO-O- (k3 represents an integer of any of 1 to 7). L a7 , -O-, *-OL a8 -O-, *-OL a8 -CO-O-, *-OLa8 -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 site 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 a halogen atom, a hydrogen atom, or a halogen atom. X a3 is -CH 2 - or an oxygen atom. R a21 represents an aliphatic hydrocarbon group having 1 to 4 carbon atoms. R a22 , R a23 and R a25 each independently represents a carboxy group, a cyano group, or an aliphatic hydrocarbon group having 1 to 4 carbon atoms. p1 represents an integer 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.]

[0173] 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 a24Examples of the halogen atom in 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 includes an alkyl group having 1 to 4 carbon atoms, and more preferably includes 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.

[0174] 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.

[0175] In formulas (a3-1) to (a3-3), L a4 ~L a6 are each independently preferably -O- or *-O-(CH 2 ) k3 In the -CO-O- group, k3 is an integer of 1 to 4, and more preferably -O- and *-O-CH 2 It is preferably an oxygen atom. R a18 ~R a21 is preferably a methyl group. R a22 and R a23are 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.

[0176] 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 -CO-O-, more preferably -O-, -O-CH 2 -CO-O- or -OC 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)'. TIFF0007659418000110.tif4051 (in the formula, R a24 , L a7 has the same meaning as above.)

[0177] 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 one 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 unit, R in formulas (a3-1) to (a3-4) a18 , R a19 , R a20 and R a24A structural unit in which a methyl group corresponding to the following formula is replaced with a hydrogen atom is preferred. When the resin (A) contains the structural unit (a3), the total content thereof is usually 1 to 70 mol %, preferably 1 to 65 mol %, and more preferably 1 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 1 to 60 mol %, more preferably 1 to 50 mol %, and further preferably 1 to 50 mol %, based on all structural units in the resin (A).

[0178] <Structural unit (a4)> Examples of the structural unit (a4) include the following structural units. TIFF0007659418000112.tif3165[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 fluorine atom, and -CH 2 - may be replaced by -O- or -CO-. R 42 Examples of the saturated hydrocarbon group represented by the formula (I) include chain hydrocarbon groups, monocyclic or polycyclic alicyclic hydrocarbon groups, and groups formed by combining these groups.

[0179] 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 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 bond position): TIFF0007659418000113.tif11160 Examples of groups formed by combinations 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.

[0180] The structural unit (a4) includes at least one structural unit selected from the group consisting of formulae (a4-0), (a4-1), (a4-2), (a4-3) and (a4-4). TIFF0007659418000114.tif3953[In formula (a4-0), R 5a represents a hydrogen atom or a methyl group. L 4a 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 6a represents a hydrogen atom or a fluorine atom.

[0181] 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.

[0182] L 3aExamples of the perfluoroalkanediyl group in the formula (I) include a difluoromethylene group, a perfluoroethylene group, a perfluoropropane-1,1-diyl 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 3a Examples of the perfluorocycloalkanediyl group in the formula (I) include a perfluorocyclohexanediyl group, a perfluorocyclopentanediyl group, a perfluorocycloheptanediyl group, and a perfluoroadamantanediyl group.

[0183] 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.

[0184] 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. 5a In the structural unit, a methyl group corresponding to the above formula is replaced with a hydrogen atom. TIFF0007659418000115.tif95165

[0185] TIFF0007659418000116.tif5170[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 -CH 2 - may be replaced by -O- or -CO-. A a41 represents an optionally substituted alkanediyl group having 1 to 6 carbon atoms 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. TIFF0007659418000117.tif1383 [In formula (a-g1), s represents 0 or 1. A a42 and A a44 each 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 aliphatic 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 bond position, and the * on the right is -O-CO-R a42 ]

[0186] R a42 Examples of the saturated hydrocarbon group in include chain saturated hydrocarbon groups, monocyclic or polycyclic alicyclic saturated hydrocarbon groups, and groups formed by combining these.

[0187] 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 bond position): TIFF0007659418000118.tif11160 Examples of groups formed by combinations 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.

[0188] R a42 The substituent that is has includes at least one selected from the group consisting of a halogen atom and a group represented by formula (a-g3). Examples of the halogen atom include a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom, and a fluorine atom is preferable. TIFF0007659418000119.tif752[In formula (a-g3), X a43 represents an oxygen atom, a carbonyl group, *-O-CO-, or *-CO-O-. A a45 represents an aliphatic hydrocarbon group having 1 to 17 carbon atoms which may have a halogen atom. * stands for R a42 represents the bond position with However, R a42 -X a43 -A a45 In R a42 When A does not have a halogen atom, a45 represents an aliphatic hydrocarbon group having 1 to 17 carbon atoms and having at least one halogen atom.

[0189] A a45 Examples of the aliphatic 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; Monocyclic alicyclic hydrocarbon groups such as cyclopentyl, cyclohexyl, cycloheptyl, and cyclooctyl groups; and Examples of the alkyl group include polycyclic and alicyclic hydrocarbon groups such as a decahydronaphthyl group, an adamantyl group, a norbornyl group, and the following groups (* indicates a bonding position): TIFF0007659418000120.tif11160

[0190] 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, further preferably a perfluoroalkyl group having 1 to 6 carbon atoms, and particularly preferably a perfluoroalkyl group having 1 to 3 carbon atoms. Examples of the perfluoroalkyl group 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 the perfluorocycloalkyl group 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 not more than 15, more preferably not more than 12. In the case where the group represented by formula (a-g3) is contained as a substituent, the number thereof is preferably 1.

[0191] 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). TIFF0007659418000121.tif874[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 bond position with. A a47 represents an aliphatic 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 these has at least one halogen atom. * indicates the bond position with the carbonyl group.

[0192] A a46 The saturated hydrocarbon group preferably has 1 to 6 carbon atoms, and more preferably has 1 to 3 carbon atoms. A a47 The aliphatic hydrocarbon group preferably has 4 to 15 carbon atoms, more preferably 5 to 12 carbon atoms. a47 is more preferably a cyclohexyl group or an adamantyl group.

[0193] A preferred structure of the group represented by formula (a-g2) is the following structure (* indicates the bonding position with the carbonyl group). TIFF0007659418000122.tif13161

[0194] A a41Examples 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, a butane-1,4-diyl group, a pentane-1,5-diyl group, and a hexane-1,6-diyl group; and branched alkanediyl groups such as a propane-1,2-diyl group, a butane-1,3-diyl group, a 2-methylpropane-1,2-diyl group, a 1-methylbutane-1,4-diyl group, and a 2-methylbutane-1,4-diyl group. 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 further preferably an ethylene group.

[0195] 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 linear or branched alkanediyl groups, monocyclic or polycyclic divalent alicyclic hydrocarbon groups, and groups formed by combining alkanediyl groups and divalent alicyclic hydrocarbon groups, etc. 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, a 2-methylpropane-1,2-diyl group, etc. A a42 , A a43 and A a44 Examples of the substituent of the divalent saturated hydrocarbon group represented by the formula (1) include a hydroxy group and an alkoxy group having 1 to 6 carbon atoms. It is preferred that s is 0.

[0196] In the group represented by formula (a-g1), X a42 Examples of the group in which is -O-, -CO-, -CO-O-, or -O-CO- include the following groups. In the following examples, * and ** each represent a bond position, and ** represents -O-CO-Ra42 This is the bonding position with. TIFF0007659418000123.tif48153

[0197] 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 In the structural unit, a methyl group corresponding to the above formula is replaced with a hydrogen atom. TIFF0007659418000124.tif100142

[0198] TIFF0007659418000125.tif123141

[0199] The structural unit represented by formula (a4-1) is preferably a structural unit represented by formula (a4-2). TIFF0007659418000126.tif3454[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 the -CH 2 - may be replaced by -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 total number of carbon atoms in the molecule is limited to 21.

[0200] L 44 The alkanediyl group of A a41 Examples of the groups include the same groups as those exemplified in the above. R f6 The saturated hydrocarbon group of R a42 Examples of the groups include the same groups as those exemplified in the above. L 44 The alkanediyl group in is preferably an alkanediyl group having 2 to 4 carbon atoms, and more preferably an ethylene group.

[0201] 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.

[0202] TIFF0007659418000127.tif5164[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 f13 represents a divalent saturated hydrocarbon group having 1 to 18 carbon atoms which may contain a fluorine atom. X f12 is *-O-CO- or *-CO-O-(* is A f13 represents the bonding position 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 the molecule is limited to 20.

[0203] L 5 The alkanediyl group in a41 Examples of the alkanediyl group include the same groups as those exemplified as the alkanediyl group. A f13 The divalent saturated hydrocarbon group which may have a fluorine atom in is preferably a divalent chain saturated hydrocarbon group which may have a fluorine atom and a divalent alicyclic saturated hydrocarbon group which may have a fluorine atom, and more preferably a perfluoroalkanediyl group. Examples of the divalent chain 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 hydrocarbon group which may have 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.

[0204] A f14 The saturated hydrocarbon group and the saturated hydrocarbon group which may have a fluorine atom are represented by R a42 Among them, 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.

[0205] In formula (a4-3), L 5 is preferably an ethylene group. A f13The divalent saturated hydrocarbon group is preferably a group containing a divalent chain hydrocarbon group having 1 to 6 carbon atoms and a divalent alicyclic hydrocarbon group having 3 to 12 carbon atoms, and more preferably a divalent chain hydrocarbon group having 2 to 3 carbon atoms. A f14 The saturated hydrocarbon group of is preferably a group containing a chain hydrocarbon group having 3 to 12 carbon atoms and an alicyclic hydrocarbon group having 3 to 12 carbon atoms, and more preferably a group containing a chain hydrocarbon group having 3 to 10 carbon atoms and an alicyclic hydrocarbon group having 3 to 10 carbon atoms. f14 is preferably a group containing an alicyclic 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.

[0206] Examples of the structural unit represented by formula (a4-3) include structural units represented by formulas (a4-1'-1) to (a4-1'-11). R in the structural unit (a4-3) 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.

[0207] The structural unit (a4) also includes a structural unit represented by the formula (a4-4). TIFF0007659418000128.tif4061[In formula (a4-4), R f21 represents a hydrogen atom or a methyl group. A f21 is -(CH 2 ) j1 -, -(CH 2 ) j2 -O-(CH 2 ) j3 -or-(CH 2 ) j4 -CO-O-(CH 2 ) 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.]

[0208] R f22 The saturated hydrocarbon group of R a42 The saturated hydrocarbon group represented by R f22 is preferably an alkyl group having 1 to 10 carbon atoms and having a fluorine atom or an alicyclic hydrocarbon group having 1 to 10 carbon atoms and having a fluorine atom, more preferably an alkyl group having 1 to 10 carbon atoms and having a fluorine atom, and further preferably an alkyl group having 1 to 6 carbon atoms and having a fluorine atom. In formula (a4-4), A f21 As an example, -(CH 2 ) j1 - is preferred, an ethylene group or a methylene group is more preferred, and a methylene group is even more preferred.

[0209] Examples of the structural unit represented by formula (a4-4) include the following structural units and structural units represented by the following formulas: f21 In the structural unit, a methyl group corresponding to the above formula is replaced with a hydrogen atom. TIFF0007659418000129.tif87160 When the resin (A) has the structural unit (a4), the content thereof is preferably from 1 to 20 mol %, more preferably from 2 to 15 mol %, and even more preferably from 3 to 10 mol %, based on the total structural units of the resin (A).

[0210] <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. Among these, the structural unit (a5) is preferably a group containing an alicyclic hydrocarbon group. An example of the structural unit (a5) is a structural unit represented by the formula (a5-1). TIFF0007659418000130.tif3972[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 the -CH 2 - may be replaced by -O- or -CO-.

[0211] R 52 The alicyclic hydrocarbon group in may be either monocyclic or polycyclic. Examples of the monocyclic alicyclic hydrocarbon group include a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, and a cyclohexyl group. Examples of the polycyclic alicyclic hydrocarbon group include an adamantyl group, a norbornyl group, and the like. Examples of the aliphatic hydrocarbon group having 1 to 8 carbon atoms include alkyl groups such as a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, a sec-butyl group, a tert-butyl group, a pentyl group, a hexyl group, an octyl group, and a 2-ethylhexyl group. An example of the alicyclic hydrocarbon group having a substituent is 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.

[0212] L 55 Examples of the divalent saturated hydrocarbon group in include a divalent chain saturated hydrocarbon group and a divalent alicyclic saturated hydrocarbon group, and a divalent chain saturated hydrocarbon group is preferred. Examples of the divalent chain saturated hydrocarbon group include alkanediyl groups such as a methylene group, an ethylene group, 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.

[0213] L55 -CH contained in the divalent saturated hydrocarbon group represented by 2 Examples of the group in which - is replaced by -O- or -CO- include groups represented by formulae (L1-1) to (L1-4). In the following formulae, * and ** represent bonding positions, and * represents the bonding position with an oxygen atom. TIFF0007659418000131.tif18165 formula (L1-1), X x1 represents *-O-CO- or *-CO-O- (* represents L x1 represents the bond position 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 x1represents 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.

[0214] 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, and more preferably a single bond. L x3 is preferably a divalent aliphatic saturated hydrocarbon group having 1 to 8 carbon atoms. L x4 is preferably a single bond or a divalent aliphatic saturated hydrocarbon group having 1 to 8 carbon atoms. L x5 is preferably a divalent aliphatic saturated hydrocarbon group having 1 to 8 carbon atoms, more preferably a methylene group or an ethylene group. L x6 is preferably a single bond or a divalent aliphatic saturated hydrocarbon group having 1 to 8 carbon atoms, and 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, and 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, and 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, and more preferably a cyclohexanediyl group or an adamantanediyl group.

[0215] Examples of the group represented by formula (L1-1) include the divalent groups shown below. TIFF0007659418000132.tif54134

[0216] Examples of the group represented by formula (L1-2) include the divalent groups shown below. TIFF0007659418000133.tif24131

[0217] Examples of the group represented by formula (L1-3) include the divalent groups shown below. TIFF0007659418000134.tif15162

[0218] Examples of the group represented by formula (L1-4) include the divalent groups shown below. TIFF0007659418000135.tif26114L 55 is preferably a single bond or a group represented by formula (L1-1).

[0219] The structural unit (a5-1) may be any of the structural units shown below and R in the structural unit (a5-1) in the structural unit shown below. 51 In the structural unit, a methyl group corresponding to the above formula is replaced with a hydrogen atom. 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).

[0220] <Structural unit (II)> Resin (A) may further contain a structural unit that decomposes upon exposure to generate an acid (hereinafter, may be referred to as "structural unit (II)"). Specific examples of structural unit (II) include structural units described in JP 2016-79235 A, and are preferably structural units 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.

[0221] The structural unit having a sulfonate group or a carboxylate group in the side chain is preferably a structural unit represented by formula (II-2-A'). TIFF0007659418000137.tif36104[In formula (II-2-A'), X III3 represents a divalent saturated hydrocarbon group having 1 to 18 carbon atoms, and the -CH 2 - 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 by 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. Z.A. + represents an organic cation.

[0222] 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 are represented by the following formula: A x1Examples 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 x1 Examples 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. X III3 Examples of the divalent saturated hydrocarbon group having 1 to 18 carbon atoms represented by the formula (I) include linear or branched alkanediyl groups, and monocyclic or polycyclic divalent alicyclic saturated hydrocarbon groups, and combinations of these may also be used. Specifically, straight-chain alkanediyl groups such as methylene group, ethylene group, propane-1,3-diyl group, propane-1,2-diyl group, butane-1,4-diyl group, pentane-1,5-diyl group, hexane-1,6-diyl group, heptane-1,7-diyl group, octane-1,8-diyl group, nonane-1,9-diyl group, decane-1,10-diyl group, undecane-1,11-diyl group, and dodecane-1,12-diyl group; butane-1,3-diyl group, 2-methylpropane-1,3-diyl group, 2-methylpropane-1,3-diyl group, Examples of the divalent alkyl group include branched alkanediyl groups such as pan-1,2-diyl group, pentane-1,4-diyl group, and 2-methylbutane-1,4-diyl group; cycloalkanediyl groups such as cyclobutane-1,3-diyl group, cyclopentane-1,3-diyl group, cyclohexane-1,4-diyl group, and cyclooctane-1,5-diyl group; 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 adamantane-2,6-diyl group. -CH contained in saturated hydrocarbon groups 2 Examples of the divalent groups in which - is replaced by -O-, -S- or -CO- include the divalent groups represented by the formulae (X1) to (X53). However, -CH 2 The number of carbon atoms before - is replaced by -O-, -S- or -CO- is 17 or less. In the following formula, * represents A x1 Represents a bond with . TIFF0007659418000138.tif145161

[0223] 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.

[0224] ZA in formula (II-2-A') + represents the cation Z1 in the acid generator (B1). + The same can be mentioned.

[0225] The structural unit represented by formula (II-2-A') is preferably a structural unit represented by formula (II-2-A). TIFF0007659418000139.tif38109 [In formula (II-2-A), R III3 , X III3 and Z.A. + has the same meaning as above. z2A represents an integer of 0 to 6. R III2 and R III4each independently represents a hydrogen atom, a fluorine atom, or a perfluoroalkyl group having 1 to 6 carbon atoms; when z2A is 2 or more, III2 and R III4 may be the same as 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.] R III2 , R III4 , Q a and Q b As the perfluoroalkyl group having 1 to 6 carbon atoms represented by the formula b1 Examples of the perfluoroalkyl group include those having 1 to 6 carbon atoms represented by the following formula:

[0226] The structural unit represented by formula (II-2-A) is preferably a structural unit represented by formula (II-2-A-1). TIFF0007659418000140.tif5578 [In formula (II-2-A-1), R III2 , R III3 , R III4 , Q a , Q b and Z.A. + has the same meaning as above. R III5 represents a saturated hydrocarbon group having 1 to 12 carbon atoms. z2A1 represents an integer of 0 to 6. X I2 represents a divalent saturated hydrocarbon group having 1 to 11 carbon atoms, and the -CH 2 - may be replaced by -O-, -S- or -CO-, and a hydrogen atom contained in the saturated hydrocarbon group may be substituted by a halogen atom or a hydroxy group. R III5Examples 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 I2 As the divalent saturated hydrocarbon group represented by the formula: III3 Examples of the divalent saturated hydrocarbon group include those similar to those represented by the following formula:

[0227] The structural unit represented by formula (II-2-A-1) is more preferably a structural unit represented by formula (II-2-A-2). TIFF0007659418000141.tif5288 [In formula (II-2-A-2), R III3 , R III5 and Z.A. + has the same meaning as above. mA and nA each independently represent 1 or 2.

[0228] 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 above 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, etc.), and the structural units described in WO 2012 / 050015. + represents an organic cation. JPEG0007659418000142.jpg86163

[0229] The structural unit having a sulfonio group and an organic anion in the side chain is preferably a structural unit represented by formula (II-1-1). TIFF0007659418000143.tif3791 [In formula (II-1-1), A II1 represents a single bond or a divalent linking group. R II1represents 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. R II4 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 (I) 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. 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 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. 2 - may be replaced by -O-, -S- or -CO-. III3 Examples of the divalent saturated hydrocarbon group having 1 to 18 carbon atoms include those represented by the following formula:

[0230] The structural unit containing a cation in formula (II-1-1) includes the structural units represented by the following formula: II4 and structural units in which a group corresponding to the methyl group in the above formula (I) is replaced with a hydrogen atom, a fluorine atom, a trifluoromethyl group, or the like. JPEG0007659418000144.jpg84130

[0231] A - Examples of the organic anion represented by the formula (I) 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 the sulfonate anion is more preferably an anion contained in the salt represented by the formula (B1) above.

[0232] A - Examples of the sulfonylimide anion represented by the formula (I) include the following. TIFF0007659418000145.tif36135

[0233] Examples of sulfonylmethide anions include the following: TIFF0007659418000146.tif29123

[0234] Examples of carboxylate anions include the following: TIFF0007659418000147.tif42154

[0235] Examples of the structural unit represented by formula (II-1-1) include structural units represented below. JPEG0007659418000148.jpg90154 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).

[0236] 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.

[0237] The resin (A) is preferably a resin composed of the structural unit (a1) and the structural unit (s). The structural unit (a1) is preferably at least one selected from the group consisting of the structural unit (a1-0), the structural unit (a1-1) and the structural unit (a1-2) (preferably the structural unit having a cyclohexyl group or a cyclopentyl group), more preferably at least two, and even more preferably the structural unit (a1-1) and / or 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 a structural unit represented by formula (a2-A) or a structural unit represented by formula (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).

[0238] Each structural unit constituting the resin (A) may be used alone or in combination of two or more, and can be produced by a known polymerization method (e.g., radical polymerization method) using a monomer that leads to these structural units. The content of each structural unit contained in the resin (A) can be adjusted by the amount of the monomer used for polymerization. The weight average molecular weight of the resin (A) is preferably 2,000 or more (more preferably 2,500 or more, and even more preferably 3,000 or more) and 50,000 or less (more preferably 30,000 or less, and even more preferably 15,000 or less). In the present specification, the weight average molecular weight is a value determined by gel permeation chromatography under the conditions described in the Examples.

[0239] <Resins other than resin (A)> The resist composition of the present invention may contain a resin other than the resin (A) in combination. Examples of resins other than resin (A) include resins containing the structural unit (a4) or the structural unit (a5) (hereinafter, sometimes referred to as resin (X)). 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 may be further contained in the resin (X) include the structural unit (a2), the structural unit (a3), and structural units derived from other known monomers. Among these, the resin (X) is preferably a resin consisting only of the structural unit (a4) and / or the structural unit (a5), and more preferably a resin consisting only of the structural unit (a4). Each structural unit constituting the resin (X) may be used alone or in combination of two or more, and can be produced by a known polymerization method (e.g., radical polymerization method) using a monomer that derives these structural units. The content of each structural unit in the resin (X) can be adjusted by the amount of the monomer used for polymerization. The weight average molecular weight of the resin (X) is preferably 6,000 or more (more preferably 7,000 or more) and 80,000 or less (more preferably 60,000 or less). The method for measuring the weight average molecular weight of the resin (X) is the same as that for the 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, still more preferably 1 to 30 parts by mass, and particularly preferably 1 to 8 parts by mass, relative to 100 parts by mass of resin (A).

[0240] The content of resin (A) in the resist composition is preferably 80% by mass or more and 99% by mass or less, more preferably 90% by mass or more and 99% by mass or less, based on the solid content of the resist composition. When a resin other than resin (A) is contained, the total content of resin (A) and the resin other than resin (A) is preferably 80% by mass or more and 99% by mass or less, more preferably 90% by mass or more and 99% by mass or less, based on the solid content of the resist composition. The solid content of the resist composition and the resin content therein can be measured by a known analytical means such as liquid chromatography or gas chromatography.

[0241] <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 a known analytical method 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; etc. One type of solvent (E) may be used alone, or two or more types may be used.

[0242] <Quencher (C)> The quencher (C) may be a basic nitrogen-containing organic compound or a salt (excluding the carboxylate represented by formula (I)) that generates an acid with a weaker acidity than the acid generated from the acid generator (B). When the resist composition contains the quencher (C), the content of the quencher (C) is preferably about 0.01 to 15 mass%, more preferably about 0.01 to 10 mass%, even more preferably about 0.1 to 5 mass%, and even more preferably about 0.1 to 3 mass%, based on the solid content of the resist composition. 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, Amines, 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 are 2,6-diisopropylaniline. Examples of the ammonium salt include tetramethylammonium hydroxide, tetraisopropylammonium hydroxide, tetrabutylammonium hydroxide, tetrahexylammonium hydroxide, tetraoctylammonium hydroxide, phenyltrimethylammonium hydroxide, 3-(trifluoromethyl)phenyltrimethylammonium hydroxide, tetra-n-butylammonium salicylate, choline, and the like.

[0243] The acidity of a 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). A salt that generates an acid with a lower acidity than the acid generated from the acid generator (B) is a salt having an acid dissociation constant of the acid generated from the salt usually of -3 < pKa, preferably -1 < pKa < 7, and more preferably 0 < pKa < 5. Examples of the salt that generates an acid with a lower acidity than the acid generated from the acid generator (B) include salts represented by the following formula, salts represented by formula (D) described in JP-A-2015-147926 (hereinafter sometimes referred to as "weak acid inner salt (D)"), and salts described in JP-A-2012-229206, JP-A-2012-6908, JP-A-2012-72109, JP-A-2011-39502, and JP-A-2011-191745. The salt that generates an acid with a lower acidity than the acid generated from the acid generator (B) is preferably a salt that generates a carboxylic acid with a lower acidity than the acid generated from the acid generator (B) (a salt having a carboxylic acid anion), and more preferably the weak acid inner salt (D). JPEG0007659418000149.jpg89165

[0244] Examples of the weak acid inner salt (D) include the following salts. TIFF0007659418000150.tif72165

[0245] 〈Other components〉 The resist composition of the present invention may contain components other than the above-mentioned components (hereinafter, sometimes referred to as "other components (F)") as necessary. There are no particular limitations on the other components (F), and additives known in the resist field, such as sensitizers, dissolution inhibitors, surfactants, stabilizers, dyes, etc., can be used.

[0246] Preparation of Resist Composition The resist composition of the present invention can be prepared by mixing the carboxylate (I), the resin (A), the acid generator (B), and, if necessary, the resin other than the resin (A), the solvent (E), the quencher (C), 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 the like. The mixing time can be selected from 0.5 to 24 hours depending on the mixing temperature. The mixing means is not particularly limited, and stirring and mixing can be used. After mixing the components, it is preferable to filter the mixture using a filter having a pore size of about 0.003 to 0.2 μm.

[0247] <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) A step of 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. The resist composition can be applied onto 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 performed, 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 drying under reduced pressure is preferably 1 to 1.0×10 5 It is preferable that the pressure is about Pa. The obtained composition layer is usually exposed using an exposure machine. The exposure machine may be an immersion exposure machine. The exposure light source may be a KrF excimer laser (wavelength 248 nm), an ArF excimer laser (wavelength 193 nm), or a F 2 Various lasers can be used, such as those that emit ultraviolet laser light such as an excimer laser (wavelength 157 nm), those that convert the wavelength of laser light from a solid-state laser light source (YAG or semiconductor laser, etc.) to emit harmonic laser light in the far ultraviolet or vacuum ultraviolet range, and those that irradiate 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 usually 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) in order 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 composition layer after heating is usually developed using a developing device and a developer. Examples of the developing method include a dip method, a paddle method, a spray method, and a dynamic dispense method. The developing temperature is preferably, for example, 5 to 60° C., and the developing 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. For example, an aqueous solution of tetramethylammonium hydroxide or (2-hydroxyethyl)trimethylammonium hydroxide (commonly known as choline) may be used. The alkaline developer may contain a surfactant. After development, the resist pattern is preferably washed with ultrapure water, and then water remaining on the substrate and the pattern is removed. When producing a negative resist pattern 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 from 90% by mass to 100% by mass, more preferably from 95% by mass to 100% by mass, and further preferably consists essentially of the organic solvent. Among them, 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 may contain a small amount of water. During development, the development may be stopped by replacing the organic developer with a different type of solvent. The resist pattern after development 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 any rinsing liquid remaining on the substrate and the pattern.

[0248] <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, in particular as a resist composition for electron beam (EB) exposure or a resist composition for EUV exposure, and is useful for semiconductor microfabrication. EXAMPLES

[0249] The present invention will be described in more detail with reference to examples. In the examples, "%" and "parts" expressing the content or amount used are based on mass unless otherwise specified. The weight average molecular weight is a value determined by gel permeation chromatography under the following analytical conditions: Column: TSKgel Multipore HXL-M x 3 + guard column (Tosoh Corporation) 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 model, MASS: Agilent LC / MSD model). In the following examples, the value of this molecular ion peak is indicated by "MASS".

[0250] Example 1: Synthesis of a salt represented by formula (I-2) TIFF0007659418000151.tif37133 20 parts of the compound represented by formula (I-2-a), 2.28 parts of the compound represented by formula (I-2-c), 100 parts of ethyl acetate, and 15 parts of tetrahydrofuran were mixed and stirred at 23 ° C. for 30 minutes. 6.55 parts of the compound represented by formula (I-2-b) were added to the resulting mixed solution and stirred at 23 ° C. for 18 hours. 20 parts of n-heptane and 70 parts of ion-exchanged water were added to the resulting reaction mass and stirred at 23 ° C. for 30 minutes, and then the organic layer was separated and taken out. 60 parts of ion-exchanged water was added to the collected organic layer and stirred at 23 ° C. for 30 minutes, and then the organic layer was separated and taken out. This water washing operation 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; Kanto Chemical Co., Ltd., developing solvent: n-heptane / ethyl acetate=1 / 1) to obtain 7.48 parts of the compound represented by formula (I-2-d). TIFF0007659418000152.tif45125 0.95 parts of the compound represented by formula (I-2-d) and 10 parts of tetrahydrofuran were mixed, stirred at 23 ° C. for 30 minutes, cooled to 5 ° C., and 0.14 parts of sodium hydride were added. 1.82 parts of the salt represented by formula (I-2-e) were added to the resulting mixture, and stirred at 5 ° C. for 3 hours. 6.30 parts of 1N hydrochloric acid were added to the resulting mixture, and the temperature was raised to 23 ° C. and stirred at 23 ° C. for 6 hours. 30 parts of chloroform and 15 parts of ion-exchanged water were added to the resulting mixture, stirred at 23 ° C. for 30 minutes, and then separated to take out the organic layer. After concentrating the resulting organic layer, 1 part of acetonitrile and 30 parts of tert-butyl methyl ether were added to the concentrated residue, stirred at 23 ° C. for 30 minutes, and then the supernatant liquid was removed and concentrated to obtain 1.66 parts of the salt represented by formula (I-2-f). TIFF0007659418000153.tif35146 0.95 parts of the salt represented by formula (I-2-f) and 30 parts of dimethylformamide were mixed and stirred at 23 ° C for 30 minutes, then 0.16 parts of potassium carbonate and 0.05 parts of potassium iodide were added, and the temperature was raised to 75 ° C. To the obtained mixture, 1.07 parts of the compound represented by formula (I-2-g) were added, stirred at 75 ° C for 5 hours, and then cooled to 23 ° C. To the obtained mixture, 50 parts of chloroform and 20 parts of a 5% aqueous oxalic acid solution were added, stirred at 23 ° C for 30 minutes, and then separated to take out the organic layer. To the obtained organic layer, 20 parts of ion-exchanged water were added, stirred at 23 ° C for 30 minutes, and then separated to take out the organic layer. This water washing operation was repeated five times. By concentrating the obtained organic layer, 1.22 parts of the salt represented by formula (I-2-h) was obtained. TIFF0007659418000154.tif53157 0.96 parts of the salt represented by formula (I-2-h), 0.47 parts of the salt represented by formula (I-2-g), 30 parts of chloroform, and 15 parts of ethyl acetate were mixed and stirred at 23°C for 2 hours. 20 parts of ion-exchanged water was added to the resulting mixture and stirred at 23°C for 30 minutes, and then the organic layer was separated and taken out. This water washing operation was repeated five times. The resulting organic layer was concentrated to obtain 1.10 parts of the salt represented by formula (I-2). MASS(ESI(+)Spectrum):M + 565.2 MASS(ESI(-)Spectrum):M - 193.1

[0251] Example 2: Synthesis of a salt represented by formula (I-4) TIFF0007659418000155.tif58158 0.96 parts of the salt represented by formula (I-2-h), 0.70 parts of the salt represented by formula (I-4-g), 30 parts of chloroform, and 15 parts of ethyl acetate were mixed and stirred at 23°C for 2 hours. 20 parts of ion-exchanged water was added to the resulting mixture and stirred at 23°C for 30 minutes, and then the organic layer was separated and taken out. This water washing operation was repeated five times. The resulting organic layer was concentrated to obtain 1.33 parts of the salt represented by formula (I-4). MASS(ESI(+)Spectrum):M+ 565.2 MASS(ESI(-)Spectrum):M - 337.1

[0252] Example 3: Synthesis of a salt represented by formula (I-192) TIFF0007659418000156.tif36146 0.95 parts of the salt represented by formula (I-2-f) and 30 parts of dimethylformamide were mixed and stirred at 23 ° C for 30 minutes, then 0.16 parts of potassium carbonate and 0.05 parts of potassium iodide were added, and the temperature was raised to 75 ° C. To the resulting mixture, 1.08 parts of the compound represented by formula (I-192-g) were added, stirred at 75 ° C for 5 hours, and then cooled to 23 ° C. To the resulting mixture, 50 parts of chloroform and 20 parts of a 5% aqueous oxalic acid solution were added, stirred at 23 ° C for 30 minutes, and then separated to take out the organic layer. To the resulting organic layer, 20 parts of ion-exchanged water were added, stirred at 23 ° C for 30 minutes, and then separated to take out the organic layer. This water washing operation was repeated five times. By concentrating the resulting organic layer, 1.17 parts of the salt represented by formula (I-192-h) was obtained. TIFF0007659418000157.tif57161 0.96 parts of the salt represented by formula (I-192-h), 0.47 parts of the salt represented by formula (I-2-g), 30 parts of chloroform, and 15 parts of ethyl acetate were mixed and stirred at 23°C for 2 hours. 20 parts of ion-exchanged water was added to the resulting mixture and stirred at 23°C for 30 minutes, and then the organic layer was separated and taken out. This water washing operation was repeated five times. The resulting organic layer was concentrated to obtain 1.10 parts of the salt represented by formula (I-192). MASS(ESI(+)Spectrum):M + 567.2 MASS(ESI(-)Spectrum):M - 193.1

[0253] Example 4: Synthesis of a salt represented by formula (I-857) TIFF0007659418000158.tif36146 0.95 parts of the salt represented by formula (I-2-f) and 30 parts of dimethylformamide were mixed and stirred at 23 ° C for 30 minutes, then 0.16 parts of potassium carbonate and 0.05 parts of potassium iodide were added, and the temperature was raised to 75 ° C. To the obtained mixture, 1.20 parts of the compound represented by formula (I-857-g) were added, stirred at 75 ° C for 5 hours, and then cooled to 23 ° C. To the obtained mixture, 50 parts of chloroform and 20 parts of a 5% aqueous oxalic acid solution were added, stirred at 23 ° C for 30 minutes, and then separated to take out the organic layer. To the obtained organic layer, 20 parts of ion-exchanged water were added, stirred at 23 ° C for 30 minutes, and then separated to take out the organic layer. This water washing operation was repeated five times. By concentrating the obtained organic layer, 1.26 parts of the salt represented by formula (I-857-h) was obtained. TIFF0007659418000159.tif52155 1.00 parts of the salt represented by formula (I-857-h), 0.47 parts of the salt represented by formula (I-2-g), 30 parts of chloroform, and 15 parts of ethyl acetate were mixed and stirred at 23°C for 2 hours. 20 parts of ion-exchanged water was added to the obtained mixture and stirred at 23°C for 30 minutes, and then the organic layer was separated and taken out. This water washing operation was repeated five times. The obtained organic layer was concentrated to obtain 1.13 parts of the salt represented by formula (I-857). MASS(ESI(+)Spectrum):M + 593.2 MASS(ESI(-)Spectrum):M - 193.1

[0254] Example 5: Synthesis of a salt represented by formula (I-859) TIFF0007659418000160.tif54158 1.00 parts of the salt represented by formula (I-857-h), 0.70 parts of the salt represented by formula (I-4-g), 30 parts of chloroform, and 15 parts of ethyl acetate were mixed and stirred at 23°C for 2 hours. 20 parts of ion-exchanged water was added to the resulting mixture and stirred at 23°C for 30 minutes, and then the organic layer was separated and taken out. This water washing operation was repeated five times. The resulting organic layer was concentrated to obtain 1.41 parts of the salt represented by formula (I-859). MASS(ESI(+)Spectrum):M + 593.2 MASS(ESI(-)Spectrum):M - 337.1

[0255] Example 6: Synthesis of salt represented by formula (I-2569) TIFF0007659418000161.tif110163 1.90 parts of the compound represented by formula (I-2-d) and 20 parts of tetrahydrofuran were mixed and stirred at 23 ° C for 30 minutes, then cooled to 5 ° C, and 0.28 parts of sodium hydride were added. 1.92 parts of the salt represented by formula (I-2569-e) were added to the resulting mixture and stirred at 5 ° C for 3 hours. 6.30 parts of 1N hydrochloric acid were added to the resulting mixture, and the temperature was raised to 23 ° C and stirred at 23 ° C for 6 hours. 30 parts of chloroform and 15 parts of ion-exchanged water were added to the resulting mixture and stirred at 23 ° C for 30 minutes, and then the organic layer was separated and taken out. The obtained organic layer was concentrated, and then 1 part of acetonitrile and 30 parts of tert-butyl methyl ether were added to the concentrated residue, followed by stirring at 23°C for 30 minutes. The supernatant was then removed, and the mixture was concentrated to obtain 2.26 parts of a salt represented by formula (I-2569-f). TIFF0007659418000162.tif46149 1.24 parts of the salt represented by formula (I-2569-f) and 50 parts of dimethylformamide were mixed and stirred at 23 ° C for 30 minutes, then 0.32 parts of potassium carbonate and 0.10 parts of potassium iodide were added, and the temperature was raised to 75 ° C. To the obtained mixture, 1.21 parts of the compound represented by formula (I-857-g) were added, stirred at 75 ° C for 5 hours, and then cooled to 23 ° C. To the obtained mixture, 50 parts of chloroform and 20 parts of a 5% aqueous oxalic acid solution were added, stirred at 23 ° C for 30 minutes, and then separated to take out the organic layer. To the obtained organic layer, 20 parts of ion-exchanged water were added, stirred at 23 ° C for 30 minutes, and then separated to take out the organic layer. This water washing operation was repeated five times. The obtained organic layer was concentrated to obtain 1.92 parts of the compound represented by formula (I-2569-b). TIFF0007659418000163.tif109158 1.53 parts of the salt represented by formula (I-2569-b), 0.70 parts of the salt represented by formula (I-4-g), 30 parts of chloroform, and 15 parts of ethyl acetate were mixed and stirred at 23°C for 2 hours. 20 parts of ion-exchanged water was added to the resulting mixture and stirred at 23°C for 30 minutes, and then the organic layer was separated and taken out. This water washing operation was repeated five times. The resulting organic layer was concentrated to obtain 1.68 parts of the salt represented by formula (I-2569). MASS(ESI(+)Spectrum):M + 923.3 MASS(ESI(-)Spectrum):M - 337.1

[0256] Example 7: Synthesis of salt represented by formula (I-1999) TIFF0007659418000164.tif86163 0.95 parts of the compound represented by formula (I-2-d) and 20 parts of tetrahydrofuran were mixed and stirred at 23 ° C for 30 minutes, then cooled to 5 ° C, and 0.14 parts of sodium hydride were added. 2.60 parts of the salt represented by formula (I-1999-e) were added to the resulting mixture and stirred at 5 ° C for 3 hours. 6.30 parts of 1N hydrochloric acid were added to the resulting mixture, and the temperature was raised to 23 ° C and stirred at 23 ° C for 6 hours. 30 parts of chloroform and 15 parts of ion-exchanged water were added to the resulting mixture and stirred at 23 ° C for 30 minutes, and then the organic layer was separated and taken out. The obtained organic layer was concentrated, and then 1 part of acetonitrile and 30 parts of tert-butyl methyl ether were added to the concentrated residue, followed by stirring at 23° C. for 30 minutes. The supernatant was then removed, and the mixture was concentrated to obtain 2.11 parts of the salt represented by formula (I-1999-f). TIFF0007659418000165.tif36150 1.27 parts of the salt represented by formula (I-1999-f) and 30 parts of dimethylformamide were mixed and stirred at 23 ° C for 30 minutes, then 0.16 parts of potassium carbonate and 0.05 parts of potassium iodide were added, and the temperature was raised to 75 ° C. To the obtained mixture, 0.60 parts of the compound represented by formula (I-857-g) were added, stirred at 75 ° C for 5 hours, and then cooled to 23 ° C. To the obtained mixture, 50 parts of chloroform and 20 parts of a 5% aqueous oxalic acid solution were added, stirred at 23 ° C for 30 minutes, and then separated to take out the organic layer. To the obtained organic layer, 20 parts of ion-exchanged water were added, stirred at 23 ° C for 30 minutes, and then separated to take out the organic layer. This water washing operation was repeated five times. The obtained organic layer was concentrated to obtain 1.61 parts of the compound represented by formula (I-1999-g). TIFF0007659418000166.tif75158 1.22 parts of the salt represented by formula (I-1999-g), 0.70 parts of the salt represented by formula (I-4-g), 30 parts of chloroform, and 15 parts of ethyl acetate were mixed and stirred at 23°C for 2 hours. 20 parts of ion-exchanged water was added to the resulting mixture and stirred at 23°C for 30 minutes, and then the organic layer was separated and taken out. This water washing operation was repeated five times. The resulting organic layer was concentrated to obtain 1.51 parts of the salt represented by formula (I-1999). MASS(ESI(+)Spectrum):M + 729.2 MASS(ESI(-)Spectrum):M - 337.1

[0257] Example 8: Synthesis of a salt represented by formula (I-2379) TIFF0007659418000167.tif111161 1.90 parts of the compound represented by formula (I-2-d) and 20 parts of tetrahydrofuran were mixed and stirred at 23 ° C for 30 minutes, then cooled to 5 ° C, and 0.28 parts of sodium hydride were added. 2.64 parts of the salt represented by formula (I-2379-e) were added to the resulting mixture and stirred at 5 ° C for 3 hours. 6.30 parts of 1N hydrochloric acid were added to the resulting mixture, and the temperature was raised to 23 ° C and stirred at 23 ° C for 6 hours. 30 parts of chloroform and 15 parts of ion-exchanged water were added to the resulting mixture and stirred at 23 ° C for 30 minutes, and then the organic layer was separated and taken out. The obtained organic layer was concentrated, and then 1 part of acetonitrile and 30 parts of tert-butyl methyl ether were added to the concentrated residue, followed by stirring at 23°C for 30 minutes. The supernatant was then removed, and the mixture was concentrated to obtain 2.48 parts of the salt represented by formula (I-2379-f). TIFF0007659418000168.tif48153 1.53 parts of the salt represented by formula (I-2379-f) and 50 parts of dimethylformamide were mixed and stirred at 23 ° C for 30 minutes, then 0.32 parts of potassium carbonate and 0.10 parts of potassium iodide were added, and the temperature was raised to 75 ° C. To the obtained mixture, 1.21 parts of the compound represented by formula (I-857-g) were added, stirred at 75 ° C for 5 hours, and then cooled to 23 ° C. To the obtained mixture, 50 parts of chloroform and 20 parts of a 5% aqueous oxalic acid solution were added, stirred at 23 ° C for 30 minutes, and then separated to take out the organic layer. To the obtained organic layer, 20 parts of ion-exchanged water were added, stirred at 23 ° C for 30 minutes, and then separated to take out the organic layer. This water washing operation was repeated five times. The obtained organic layer was concentrated to obtain 2.19 parts of the compound represented by formula (I-2379-b). TIFF0007659418000169.tif110147 1.73 parts of the salt represented by formula (I-2379-b), 0.70 parts of the salt represented by formula (I-4-g), 30 parts of chloroform, and 15 parts of ethyl acetate were mixed and stirred at 23°C for 2 hours. 20 parts of ion-exchanged water was added to the resulting mixture and stirred at 23°C for 30 minutes, and then the organic layer was separated and taken out. This water washing operation was repeated five times. The resulting organic layer was concentrated to obtain 1.99 parts of the salt represented by formula (I-2379). MASS(ESI(+)Spectrum):M + 1049.2 MASS(ESI(-)Spectrum):M - 337.1

[0258] Resin synthesis The compounds (monomers) used in the synthesis of resin (A) are shown below. Hereinafter, these compounds will be referred to as "monomer (a1-1-3)" etc. according to their formula numbers. TIFF0007659418000170.tif43144

[0259] Synthesis Example 1: Synthesis of Resin A1 Monomers (a1-1-3), (a1-2-6), (a2-1-1) and (a3-4-2) were used as monomers, and the molar ratio [monomer (a1-1-3):monomer (a1-2-6):monomer (a2-1-1):monomer (a3-4-2)] was mixed to 45:14:2.5:38.5, and propylene glycol monomethyl ether acetate was added in an amount of 1.5 times the total monomer amount to form a solution. Azobisisobutyronitrile and azobis(2,4-dimethylvaleronitrile) were added as initiators to this solution in amounts of 1 mol% and 3 mol%, respectively, relative to the total monomer amount, and these were heated at 73°C for about 5 hours. The resulting reaction mixture was poured into a large amount of a methanol / water mixed solvent to precipitate a resin, and the resin was filtered. The obtained resin was dissolved again in propylene glycol monomethyl ether acetate, and the resulting solution was poured into a methanol / water mixed solvent to precipitate the resin. This reprecipitation procedure was repeated twice to filter the resin, resulting in a weight-average molecular weight of 7.8 × 10 3 Resin A1 was obtained in a yield of 69%. This resin A1 has the following structural units. TIFF0007659418000171.tif36126

[0260] Synthesis Example 2: Synthesis of Resin X1 Monomer (a5-1-1) and monomer (a4-0-12) were used as monomers, and mixed in a molar ratio of 50:50 [monomer (a5-1-1):monomer (a4-0-12)], and 1.2 times the mass of the total monomer amount of methyl isobutyl ketone was added to make a solution. Azobis(2,4-dimethylvaleronitrile) was added as an initiator to this solution in an amount of 3 mol% relative to the total monomer amount, and the solution was heated at 70°C for about 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 and the weight average molecular weight of the resin was 1.0×10 4 Resin X1 was obtained in a yield of 91%. This resin X1 has the following structural units. TIFF0007659418000172.tif3082

[0261] <Preparation of Resist Composition> As shown in Table 2, the following components were mixed and the resulting mixture was filtered through a fluororesin filter having a pore size of 0.2 μm to prepare a resist composition.

[0262] [Table 2]

[0263] <Resin> A1, X1: Resin A1, Resin X1 <Acid Generator (B)> B1-21: A salt represented by the formula (B1-21) B1-22: a salt represented by the formula (B1-22) TIFF0007659418000174.tif2996<Carboxylate(I)> I-2: A salt represented by formula (I-2) I-4: A salt represented by formula (I-4) I-192: A salt represented by the formula (I-192) I-857: A salt represented by the formula (I-857) I-859: A salt represented by the formula (I-859) I-1999: A salt represented by the formula (I-1999) I-2379: A salt represented by the formula (I-2379) I-2569: A salt represented by the formula (I-2569) <Quencher (C)> IX-1 IX-2 IX-3 TIFF0007659418000175.tif53116<solvent> Propylene glycol monomethyl ether acetate 265 parts Propylene glycol monomethyl ether 20 parts 2-Heptanone 20 parts γ-butyrolactone 3.5 parts

[0264] <Production and Evaluation of Resist Patterns> A composition for organic antireflective coating [ARC-29; manufactured by Nissan Chemical Industries, Ltd.] was applied onto a 12-inch silicon wafer and baked at 205°C for 60 seconds to form an organic antireflective coating having a thickness of 78 nm. Next, the resist composition was spin-coated onto the organic antireflective coating so that the film thickness of the composition layer after drying (pre-baking) would be 100 nm. After application, the silicon wafer was pre-baked on a direct hot plate at the temperature shown in the "PB" column of Table 2 for 60 seconds to form a composition layer on the silicon wafer. The composition layer formed on the silicon wafer was exposed to a liquid immersion exposure ArF excimer laser stepper [XT:1900Gi; ASML, NA=1.35, Annular σ out =0.85 σ in =0.65 XY-pol. illumination], a mask was used to form a trench pattern (pitch 120 nm / trench width 40 nm) and the exposure dose was changed stepwise. Ultrapure water was used as the immersion medium. After exposure, post-exposure baking was performed on a hot plate for 60 seconds at the temperature shown in the "PEB" column in Table 2. Next, the composition layer on this silicon wafer was developed by a dynamic dispensing method at 23°C for 20 seconds using butyl acetate (manufactured by Tokyo Chemical Industry Co., Ltd.) as a developer to produce a negative resist pattern.

[0265] In the obtained resist pattern, the exposure amount at which the width of the trench pattern became 40 nm was defined as the effective sensitivity.

[0266] <Line Edge Roughness Evaluation (LER)> The resulting resist pattern was observed and measured with a scanning electron microscope for the amplitude of unevenness on the wall surface. The results are shown in Table 3. The values ​​in the table indicate the amplitude (nm).

[0267] [Table 3] [Industrial Applicability]

[0268] INDUSTRIAL APPLICABILITY The carboxylate of the present invention and the resist composition containing the carboxylate are capable of obtaining a resist pattern exhibiting good line edge roughness (LER), and are therefore suitable for semiconductor microfabrication and extremely useful industrially.

Claims

1. A carboxylate represented by formula (I): [In formula (I), R １ , R ２ and R ３ each independently represents -O-R １０ , -O-CO-R １０ , -O-CO-OR １０ , -O-L １ -C-O-R １０ Represents. L １ represents an alkanediyl group having 1 to 6 carbon atoms. R ４ , R ５ , R ６ , R ７ , R ８ and R ９ each independently represents a halogen atom, a fluorinated alkyl group having 1 to 6 carbon atoms, or a hydrocarbon group having 1 to 18 carbon atoms, the hydrocarbon group optionally having a substituent, and -CH 2 - is -O-, -CO-, -SO ２ It may be replaced by - or -S-. R １０ represents a group having a lactone structure. X １ , X ２ and X ３ each independently represents an oxygen atom or a sulfur atom. m1 represents an integer of 1 to 5, and when m1 is 2 or more, the groups in multiple parentheses may be the same or different. m2 represents an integer of 0 to 5, and when m2 is 2 or more, the groups in the parentheses may be the same or different. m3 represents an integer of 0 to 5, and when m3 is 2 or more, the groups in the parentheses may be the same or different. When m2 and m3 are 1 or more, the groups in the parentheses may be the same or different. １０ may be the same or different from each other. m4 represents an integer of 0 to 4, and when m4 is 2 or more, a plurality of R ４ may be the same or different from each other. m5 represents an integer of 0 to 4, and when m5 is 2 or more, a plurality of R ５ may be the same or different from each other. m6 represents an integer of 0 to 4, and when m6 is 2 or more, a plurality of R ６ may be the same or different from each other. m7 represents an integer of 0 to 4, and when m7 is 2 or more, a plurality of R ７ may be the same or different from each other. m8 represents an integer of 0 to 5, and when m8 is 2 or more, a plurality of R ８ may be the same or different from each other. m9 represents an integer of 0 to 5, and when m9 is 2 or more, a plurality of R ９ may be the same or different from each other. However, 1≦m1+m7≦5, 0≦m2+m8≦5, and 0≦m3+m9≦5. X ０ represents a hydrocarbon group having 1 to 72 carbon atoms which may have a substituent, and the —CH 2 - is -O-, -S-, -CO- or -SO ２ - may be replaced.

2. X １ , X ２ and X ３ The carboxylate according to claim 1, wherein is an oxygen atom.

3. R １０ The group having a lactone structure represented by the formula (R １０ -1), formula (R １０ -2) or formula (R １０ 3. The carboxylate according to claim 1, wherein the carboxylate is a group having a lactone ring group represented by the formula (1). [Formula (R １０ -1)~Formula (R １０ -3) Middle * represents a bond. Z 12 represents an oxygen atom, a sulfur atom, or a methylene group. R １１ , R １２ and R １３ each independently represents a halogen atom, a fluorinated alkyl group having 1 to 6 carbon atoms, or a hydrocarbon group having 1 to 18 carbon atoms, and —CH 2 - may be replaced by -O-, -CO- or -S-. m11 represents an integer of 0 to 5, and when m11 is 2 or more, a plurality of R １１ may be the same or different from each other. m12 represents an integer of 0 to 5, and when m12 is 2 or more, a plurality of R １２ may be the same or different from each other. m13 represents an integer of 0 to 5, and when m13 is 2 or more, a plurality of R １３ may be the same or different from each other. n10 represents an integer of 1 to 3.

4. X ０ is an aliphatic hydrocarbon group having 1 to 72 carbon atoms which may have a substituent (provided that the —CH 2 - is -O-, -S-, -CO- or -SO ２ 4. The carboxylate according to claim 1, wherein the carboxylate is an aromatic hydrocarbon group having 6 to 36 carbon atoms which may be substituted with -.

5. X ０ is an alicyclic hydrocarbon group having 3 to 36 carbon atoms which may have a fluorine atom or a hydroxyl group (the —CH 2 5. The carboxylate according to claim 1, wherein - may be replaced by -O- or -CO-, or a phenyl group which may have a halogen atom, a hydroxyl group, or a perfluoroalkyl group having 1 to 4 carbon atoms.

6. X ０ 5. The carboxylate according to 4, wherein is a group represented by formula (aa). [In formula (aa), X a and X b each independently represents --O-- or --S--. X １ａ represents a hydrocarbon group having 1 to 24 carbon atoms which may have a substituent, and the —CH 2 - is -O-, -S-, -CO- or -SO ２ It may be replaced with -. X ２ａ represents a hydrocarbon group having 1 to 48 carbon atoms which may have a substituent, and the —CH 2 - is -O-, -S-, -CO- or -SO ２ It may be replaced with -. * indicates -COO － represents the bonding position with the carbon atom of

7. X ０ The carboxylate according to claim 4, wherein is an aromatic hydrocarbon group having 6 to 36 carbon atoms and having a halogen atom, a hydroxyl group, or a perfluoroalkyl group having 1 to 4 carbon atoms.

8. X ０ The carboxylate according to claim 4, wherein is a group represented by formula (bb): [In formula (bb), L Ａ represents an alkanediyl group having 1 to 6 carbon atoms which may have a fluorine atom, or an aromatic hydrocarbon group having 6 carbon atoms which may have a halogen atom or a perfluoroalkyl group having 1 to 4 carbon atoms. L Ｂ represents a single bond or an alkanediyl group having 1 to 6 carbon atoms, and the —CH 2 - is -O-, -S-, -CO- or -SO ２ It may be replaced with -. R Ａ represents a hydrocarbon group having 1 to 36 carbon atoms which may have a substituent, and the —CH 2 - is -O-, -S-, -CO- or -SO ２ It may be replaced with -. * indicates -COO － represents the bonding position with the carbon atom of

9. A carboxylic acid generator comprising the carboxylate according to any one of claims 1 to 8.

10. 10. A resist composition comprising the carboxylic acid generator according to claim 9, an acid generator other than the carboxylic acid generator, and a resin having an acid labile group.

11. 11. The resist composition according to claim 10, wherein the resin having an acid labile group comprises at least one member selected from the group consisting of a structural unit represented by formula (a1-1) and a structural unit represented by formula (a1-2). [In formula (a1-1) and formula (a1-2), L a1 and L a2 are each independently -O- or *-O-(CH ２ ) k1 It represents --CO--O--, k1 represents an integer of 1 to 7, and * represents a bond to --CO--. R a4 and R a5 each independently represents a hydrogen atom, a halogen atom, or an alkyl group having 1 to 6 carbon atoms which may have a halogen atom. R 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.

12. The resist composition according to claim 10 or 11, further comprising a resin that includes a structural unit having a fluorine atom.

13. (1) A step of applying the resist composition according to any one of claims 10 to 12 onto a substrate; (2) A step of 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) developing the composition layer after heating; A method for producing a resist pattern comprising the steps of:

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