Patent ID: 7776511

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 structural unit (a0-1) represented by general formula (a0-1) shown below and a structural unit (a0-2) represented by general formula (a0-2) shown below: wherein: in general formula (a0-1), 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 alkyl group-containing 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, and in general formula (a0-2), R represents a hydrogen atom, a halogen atom, a lower alkyl group or a halogenated lower alkyl group; Y 3 represents an aliphatic cyclic group; each of g and h independently represents an integer of 0 to 3; and i represents an integer of 1 to 3.