Patent ID: 7316888
Filing Date: 2008-01-08
Classification: G03F,Y10S

Abstract:
1. A positive type resist composition comprising (A) a resin component comprising within the principal chain a structural unit derived from a (meth)acrylate ester and incorporating an acid dissociable, dissolution inhibiting group containing a polycyclic group on an ester side chain section, 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, wherein said component (A) comprises a structural unit derived from a (meth)acrylate ester, and comprising an acid dissociable, dissolution inhibiting group containing a polycyclic group, a structural unit derived from a (meth)acrylate ester, and comprising a lactone containing monocyclic group or polycyclic group, and a structural unit derived from a (meth)acrylate ester, and comprising a hydroxyl group containing polycyclic group; and one of said structural units is derived from a methacrylate ester and one of said structural unit is derived from an acrylate ester, and wherein said component (A) comprises a copolymer (A1) with a structural unit derived from methacrylate ester and a structural unit derived from an acrylic ester and said copolymer (A1) is a copolymer (e) described below: copolymer (e): a copolymer formed from 30 to 60 mol % of a structural unit (a1′) derived from a methacrylate ester, and comprising an acid dissociable, dissolution inhibiting group containing a polycyclic group, 20 to 60 mol % of a structural unit (a2) derived from an acrylate ester, and comprising a lactone containing monocyclic group or polycyclic group, 1 to 30 mol % of a structural unit (a3) derived from an acrylate ester, and comprising a hydroxyl group containing polycyclic group, and 1 to 25 mol % of a structural unit (a4) derived from a (meth)acrylate ester, and comprising a polycyclic group which is different from said acid dissociable, dissolution inhibiting group containing a polycyclic group, said lactone containing monocyclic group or polycyclic group, or said hydroxyl group containing polycyclic group.