Patent ID: 7968269

Claim:
A positive resist composition for immersion exposure comprising a resin component (A) which has acid dissociable, dissolution inhibiting groups and 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 cyclic principal chain polymer (A1) and a non-cyclic principal chain polymer (A2) having a structural unit (a) derived from acrylic acid as a principal chain, and said non-cyclic principal chain polymer (A2) having a structural unit (a1) derived from an acrylate ester having an acid dissociable, dissolution inhibiting group (p1) represented by general formula (p1) shown below: wherein R 1 , and R 2 , each independently represents a hydrogen atom or an alkyl group of 1 to 5 carbon atoms; n represents an integer of 0 to 3; and Y represents an alkyl group of 1 to 5 carbon atoms or an aliphatic cyclic group.