Patent ID: 7964331

Claim:
A positive resist composition comprising a resin component (A) which exhibits increased alkali solubility under action of acid and an acid-generator component (B) which generates acid upon exposure, said resin component (A) comprising: a polymer (A1) comprising a structural unit (a0) represented by general formula (a0) shown below and no structural unit (a1) derived from an acrylate ester containing an acetal-type acid dissociable, dissolution inhibiting group, exclusive of said structural unit (a0), and a polymer (A2) comprising said structural unit (a1) and no structural unit (a0): wherein R represents a hydrogen atom, a halogen atom, a lower alkyl group or a halogenated lower alkyl group; Y 1 represents an aliphatic cyclic group; Z represents a tertiary alkyloxycarbonyl group, a tertiary alkyloxycarbonylalkyl group or an alkoxyalkyl group; a represents an integer of 1 to 3, and b represents an integer of 0 to 2, with the proviso that a+b=1 to 3; and each of c, d and e independently represents an integer of 0 to 3.