Patent ID: 8247159
Filing Date: 2012-08-21
Classification: G03F

Abstract:
1. A positive resist composition comprising a resin component (A) which exhibits increased alkali solubility under action of acid and an acid-generator component (B) which generates acid upon exposure, said resin component (A) comprising at least one of a tertiary copolymer consisting of a structural unit (a0) represented by general formula (a0) shown below, a structural unit (a1) derived from an acrylate ester having a polycyclic group-containing, acid dissociable, dissolution inhibiting group of a tertiary alkyl ester-type, and a structural unit (a2); a quaternary copolymer consisting of the structural unit (a0), the structural unit (a1), the structural unit (a2), and a structural unit (a4) derived from an acrylate ester containing a non-acid dissociable, aliphatic cyclic group; and a quinary copolymer consisting of the structural unit (a0), the structural unit (a1), the structural unit (a2), the structural unit (a4), and a structural unit (a5) derived from an acrylate ester having an acid dissociable, dissolution inhibiting group other than the polycyclic group-containing, acid dissociable, dissolution inhibiting groups of a tertiary alkyl ester-type, wherein said structural unit (a2) comprises at least one member selected from the group consisting of structural units represented by following general formulas (a2-1), (a2-2), (a2-4) and (a2-5): wherein: R represents a hydrogen atom, a halogen atom, a lower alkyl group or a halogenated lower alkyl group; Y 1 represents an aliphatic cyclic group; Z represents a chain-like tertiary alkyloxycarbonyl group represented by general formula (II) shown below, or a chain-like tertiary alkyloxycarbonylalkyl group represented by general formula (III) shown below; a represents an integer of 1 to 3, and b represents an integer of 0 to 2, such that a+b=1 to 3; and each of c, d and e independently represents an integer of 0 to 3: wherein each of R 21 to R 23 independently represents a linear or branched alkyl group; and f represents an integer of 1 to 3; wherein R represents a hydrogen atom, a halogen atom, a lower alkyl group or a halogenated lower alkyl group; R′ represents a hydrogen atom, a lower alkyl group or an alkoxy group of 1 to 5 carbon atoms; and m represents an integer of 1.