Patent ID: 8735045

Claim:
A positive resist composition comprising a base component (A) which exhibits increased solubility in an alkali developing solution under action of acid and an acid-generator component (B) which generates acid upon exposure, 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 (a2 s ) derived from an acrylate ester containing a —SO 2 — containing cyclic group: wherein R represents a hydrogen atom, an alkyl group of 1 to 5 carbon atoms or a halogenated alkyl group of 1 to 5 carbon atoms; each of R 2 and R 3 represents a hydrogen atom; and W represents a cyclic alkylene group that may include an oxygen atom at an arbitrary position.