Patent ID: 7638258
Filing Date: 2009-12-29
Classification: G03F,Y10S

Abstract:
1. A positive resist composition, comprising: a resin component (A) that exhibits increased alkali solubility under action of acid; and an acid generator component (B) that generates acid upon exposure, wherein said resin component (A) is a mixture of a copolymer (A1) that includes a structural unit (a1) derived from an acrylate ester that contains an acid-dissociable, dissolution-inhibiting group, a structural unit (a2) derived from a methacrylate ester that contains a lactone-containing monocyclic group, and a structural unit (a3) derived from an acrylate ester that contains a polar group-containing polycyclic group, and a copolymer (A2) that has a different structure from said copolymer (A1) and has a lower hydrophilicity than said copolymer (A1).