Patent ID: 8088553

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, said base component (A) comprising a polymeric compound (A1) comprising a structural unit (a0-1) represented by general formula (a0-1-1) shown below and a structural unit (a0-2) represented by general formula (a0-2) shown below: wherein R 1 represents a hydrogen atom, a lower alkyl group or a halogenated lower alkyl group; A represents a linear aliphatic hydrocarbon group; B represents a divalent linking group; R 2 represents an acid dissociable, dissolution inhibiting group; and n represents 1; and wherein R 3 represents a hydrogen atom, a lower alkyl group or a halogenated lower alkyl group; R 4 represents a branched alkyl group of 3 or more carbon atoms; and each of R 5 and R 6 independently represents an alkyl group, wherein R 5 and R 6 are mutually bonded to form a ring.