Patent ID: 7390612

Claim:
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 said component (A) further comprises: 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, and wherein the relative quantities of the structural unit derived from said methacrylate ester and the structural unit derived from said acrylate ester within the component (A) are such that relative to the combined number of moles of the structural unit derived from said methacrylate ester and the structural unit derived from said acrylate ester, the structural unit derived from said methacrylate ester accounts for 10 to 85 mol %, and the structural unit derived from said acrylate ester accounts for 15 to 90 mol %.