Patent ID: 7629106

Claim:
A resist composition which comprises, at least, a polymer including repeating units represented by the following general formulae (a) and (b), wherein R 1 , which may be the same or different, represents a hydrogen atom or a methyl group; R 2 represents a single bond; R 3 represents any one of a hydroxy group, a hydroxy group substituted with an acid labile group or an acetyl group, a carboxy group, and a carboxy group substituted with an acid labile group; R 4 represents any one of a phenylene group, —O—R 7 —, —C(═O)—X 1 —R 7 —, —C(═O)—O —C 2 H 4 —O—Y 1 —, —C(═O)—O—Z 1 —C(═O)—CH 2 —, —Z 1 —C(═O)—CH 2 —, —C(═O)—O—Z 1 —CH 2 —, and —C(═O)—X 1 —R 7 —Z 1 —; X 1 represents an oxygen atom or NH; R 7 represents a linear, branched or cyclic alkylene group having 1-6 carbon atoms which may contain a carbonyl group, an ester group or an ether group or an arylene group having 6-8 carbon atoms which may contain a carbonyl group, an ester group or an ether group; Y 1 represents any one of a phenylene group, a naphthylene group, and an anthrylene group; Z 1 represents a phenylene group; R 5 and R 6 , which may be the same or different, represent a linear, branched or cyclic alkyl group having 1-12 carbon atoms which may contain a carbonyl group, an ester group or an ether group, an aryl group having 6-12 carbon atoms, an aralkyl group having 7-20 carbon atoms or a thiophenyl group; R 5 and R 6 can be linked to form a ring; K − represents C 4 F 9 —SO 3 − ; m represents 1 or 2; a satisfies 0<a<1.0; and b satisfies 0<b≦0.8, wherein the formula (b) is a repeating unit represented by the following general Formula (b′) or (b″)