Patent ID: 8378016

Claim:
A chemically amplified positive resist composition comprising a resin which generates an acid by irradiation and is a salt of an organic cation and an anionic polymer wherein the anionic polymer has no carbon-carbon unsaturated bond, and comprises a structural unit derived from an acrylic compound having an anionic group or a structural unit derived from an alicyclic compound having an anionic group wherein the structural unit derived from an acrylic compound having an anionic group is a structural unit represented by the formula (Ia): wherein R represents a hydrogen atom, a C1-C4 alkyl group or a C1-C4 perfluoroalkyl group, Q 1 represents a divalent connecting group having no carbon-carbon unsaturated bond, and Z 1 and Z 2 are the same or different and each independently represent a fluorine atom or a C1-C4 perfluoroalkyl group, and the structural unit derived from an alicyclic compound having an anionic group is a structural unit represented by the formula (Ib): wherein Q 2 represents a divalent connecting group having no carbon-carbon unsaturated bond, Z 3 and Z 4 are the same or different and each independently represent a fluorine atom or a C1-C4 perfluoroalkyl group, U represents a hydrogen atom, a C1-C4 alkyl group, a monovalent polar group having at least one atom selected from the group consisting of an oxygen atom and a nitrogen atom, and no carbon-carbon unsaturated bond, and m represents 0, 1, or 2, and a resin which contains a structural unit which has an acid-labile group and which itself is insoluble in an alkali aqueous solution but becomes soluble in an alkali aqueous solution by the action of an acid.