Patent ID: 7794914

Claim:
A chemically amplified positive resist composition comprising: a resin (A) which contains no fluorine atom and a structural unit (a1) having an acid-labile group, a resin (B) which contains a structural unit (b2) and at least one structural unit selected from a structural unit (b1) having an acid-labile group, a structural unit (b3) having a hydroxyl group and a structural unit (b4) having a lactone structure, wherein the structural unit (b2) represents a structural unit represented by the formula (IV): wherein R 25 represents a hydrogen atom or a methyl group, and AR represents a C1-C30 fluorine-containing alkyl group which may contain one to five hydroxyl groups and at least one heteroatom selected from an oxygen, nitrogen and sulfur atom, and an acid generator, wherein the acid generator is a salt represented by the formula (V): wherein R 26 represents a C1-C6 linear or branched chain hydrocarbon group or a C3-C30 monocyclic or bicyclic hydrocarbon group, and at least one hydrogen atom in the monocyclic or bicyclic hydrocarbon group may be replaced with a C1-C6 alkoxy, C1-C4 perfluoroalkyl, C1-C6 hydroxyalkyl, hydroxyl, cyano, carbonyl or ester group, or at least one —CH 2 — in the monocyclic or bicyclic hydrocarbon group may be replaced with —CO— or —O—; A + represents an organic counter ion; Y 1 and Y 2 are the same or different and each independently represents a fluorine atom or a C1-C6 perfluoroalkyl group.