Patent ID: 8236477

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 (a3) derived from an acrylate ester containing a hydroxy group-containing aliphatic hydrocarbon group represented by general formula (a3-1) shown below, and the amount of the structural unit (a3) based on the combined total of all structural units constituting the polymeric compound (A1) being in the range of 1 to 30 mol %: in formula (a0-1), 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, R 2 represents a divalent linking group, and R 3 represents a cyclic group containing —SO 2 — within the ring skeleton thereof; and in formula (a3-1), 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 Ra, Rb and Rc independently represents a hydrogen atom, an alkyl group of 1 to 5 carbon atoms, a hydroxy group or a hydroxyalkyl group, provided that at least one of Ra, Rb and Rc represents a hydroxy group or a hydroxyalkyl group; and Rd represents a single bond or a divalent linking group.