Patent ID: 7910285
Filing Date: 2011-03-22
Classification: G03F,Y10S

Abstract:
1. 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 structural unit (a1) derived from an acrylate ester having an acid dissociable, dissolution inhibiting group, a structural unit (a2) derived from an acrylate ester having a lactone-containing cyclic group, and a structural unit (a3) derived from an acrylate ester having a polar group-containing aliphatic hydrocarbon group, wherein said resin component (A) comprises: a resin (A1) comprising said structural unit (a1), said structural unit (a2) and said structural unit (a3), and a resin (A2) comprising said structural unit (a1) and said structural unit (a2), and excluding said structural unit (a3), wherein the amount of said structural unit (a3) based on the combined total of all structural units constituting said resin component (A) is 3 to 12 mol %.