Patent ID: 8268529

Claim:
A positive resist composition comprising: a base component (A) which exhibits increased solubility in an alkali developing solution under the action of acid; an acid-generator component (B) which generates acid upon exposure; and an organic solvent (S), the base component (A) and the acid-generator component (B) being dissolved in the organic solvent (S), the base component (A) comprising a polymeric compound (A1) comprised of: a structural unit (a0) represented by general formula (a0-1) shown below, a structural unit (a1) derived from an acrylate ester containing an acid dissociable, dissolution inhibiting group, and a structural unit (a5) represented by general formula (a5-1) shown below: wherein R 1 represents a hydrogen atom, a lower alkyl group of 1 to 5 carbon atoms or a halogenated lower alkyl group of 1 to 5 carbon atoms; R 2 represents a divalent linking group; and R 3 represents a cyclic group containing —SO 2 — within the ring skeleton thereof; and wherein R represents a hydrogen atom, a lower alkyl group of 1 to 5 carbon atoms or a halogenated lower alkyl group of 1 to 5 carbon atoms; Y 1 represents an aliphatic hydrocarbon group which may have a substituent; Z represents a monovalent organic group; a represents an integer of 1 to 3, and b represents an integer of 0 to 2, with the provision that a+b=1 to 3; and each of c, d and e independently represents an integer of 0 to 3.