Patent ID: 8293449
Filing Date: 2012-10-23
Classification: G03F

Abstract:
1. A positive type resist composition comprising: (A) a resin component with only units derived from an acrylate ester in a principal chain, for which solubility in alkali increases under action of acid; (B) an acid generator component which generates acid on exposure; and (C) an organic solvent component, wherein said resin component (A) is a copolymer including (a1) a structural unit derived from an acrylate ester comprising, as an acid dissociable dissolution inhibiting group, a polycyclic dissolution inhibiting group which is eliminated more easily than a 2-methyl-2-adamantyl group; (a2) a structural unit derived from an acrylate ester comprising a lactone containing norbornyl group; and (a3) a structural unit derived from an acrylate ester comprising a hydroxyl group containing polycyclic group, wherein said structural unit (a1) is represented by a chemical formula (I) shown below: wherein, R said structural unit (a2) is a unit derived from an acrylate ester comprising a lactone containing bicycloalkyl group, and said structural unit (a3) is represented by a chemical formula shown below and, wherein if a combined total of said structural unit (a1), said structural unit (a2) and said structural unit (a3) is deemed 100 mol %, then said structural unit (a1) is within a range from 30 to 60 mol %, said structural unit (a2) is within a range from 20 to 60 mol %, and said structural unit (a3) is within a range from 10 to 50 mol %.