Patent ID: 8753796

Claim:
A photoresist composition comprising a salt represented by the formula (I): wherein R 1 and R 2 independently each represent a fluorine atom or a C1-C6 perfluoroalkyl group, X 1 represents a C1-C17 divalent saturated hydrocarbon group in which one or more hydrogen atoms can be replaced by a fluorine atom and in which one or more —CH 2 — can be replaced by —O— or —CO—, s1 represents 1 or 2, and t1 represents 0 or 1, with proviso that the sum of s1 and t1 is 1 or 2, R 3 represents a C6-C18 aromatic hydrocarbon group or a C1-C12 saturated hydrocarbon group in which one or more hydrogen atoms can be replaced by a C1-C6 alkyl group or a nitro group and in which one or more —CH 2 — can be replaced by —O—, u1 represents an integer of 0 to 5, and (Z 1 ) + represents an organic cation, a salt represented by the formula (II), the formula (III-A) or the formula (III-B): wherein R 4 in formula (II) is a group represented by the formula (II-A) wherein R 6 represents a C1-C17 hydrocarbon group in which one or more hydrogen atoms can be replaced by a fluorine atom or —OH and in which one or more —CH 2 — can be replaced by —O— or —CO—, R 7 represents a C1-C6 alkyl group, and R 8 represents a C1-C6 fluorinated alkyl group, and (Z 2 ) + represents an organic cation; wherein R 4 in formula (III-A) represents a C1-C24 hydrocarbon group in which one or more hydrogen atoms can be replaced by a fluorine atom or —OH and in which one or more —CH 2 — can be replaced by —O— or —CO—, and (Z 2 ) + is the same as defined above; wherein R 4 in formula (III-B) represents a C1-C24 hydrocarbon group in which one or more hydrogen atoms can be replaced by a fluorine atom or —OH and in which one or more —CH 2 — can be replaced by —O— or —CO—, and (Z 2 ) + is the same as defined above, and R 5 represents a C1-C24 hydrocarbon group in which one or more hydrogen atoms can be replaced by a fluorine atom or —OH and in which one or more —CH 2 — can be replaced by —O— or —CO—, and a resin being insoluble or poorly soluble in an aqueous alkali solution but becoming soluble in an aqueous alkali solution by the action of an acid.