Patent ID: 8617790

Claim:
A photoresist composition comprising (A) a resin which has an acid-labile group-containing structural unit and a lactone ring-containing structural unit, and (B) a salt represented by formula (I): wherein Q 1 and Q 2 each independently represent a fluorine atom or a C1-C6 perfluoroalkyl group, n represents 0 or 1, L 1 represents a single bond or a C1-C10 alkanediyl group in which a methylene group may be replaced by an oxygen atom or a carbonyl group, provided that L 1 is not a single bond when n is 0, R 1 represents a hydroxy group protected by a protecting group, and Z + represents an organic cation, said hydroxy group protected by a protecting group being represented by formula (2A): wherein R a61â€² and R a62â€² independently each represent a hydrogen atom or a C 1-C12 monovalent hydrocarbon group, and R a63â€² represents a C1-C20 monovalent hydrocarbon group, or R a63 â€² represents a C2-C20 divalent hydrocarbon group together with R a62â€² , and a methylene group of the monovalent hydrocarbon groups may be replaced by an oxygen atom or a sulfur atom, and a methylene group of the divalent hydrocarbon groups may be replaced by an oxygen atom or a sulfur atom, and * represents a binding position.