Patent ID: 7494759
Filing Date: 2009-02-24
Classification: G03F

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 on irradiation, wherein said component (A) is a copolymer including a structural unit (a1) derived from a mono(α-lower alkyl)acrylate that contains an acid-dissociable, dissolution-inhibiting group, a structural unit (b1) derived from a mono(α-lower alkyl)acrylate that contains a lactone ring, and a structural unit (c1) derived from a poly(α-lower alkyl)acrylate represented by a general formula (1) below: (wherein, R represents a lower alkyl group or a hydrogen atom, R