Patent ID: 8017302

Claim:
A positive resist composition comprising (A) a resin component which becomes soluble in an alkaline developer under the action of an acid and (B) a compound capable of generating an acid in response to actinic light or radiation, wherein said resin component (A) is a polymer comprising recurring units (a), (b), and (c) represented by the general formula (1): wherein R 1 is each independently hydrogen or methyl, R 2 is an acid labile group, X is O or CH 2 , R 3 is CO 2 R 4 when X is CH 2 , R 3 is hydrogen or CO 2 R 4 when X is O, R 4 is a straight, branched or cyclic, monovalent hydrocarbon group of 1 to 20 carbon atoms which may contain a heteroatom, and m is 1 or 2, and said compound (B) is a sulfonium salt compound having the general formula (2): wherein R 5 , R 6 and R 7 are each independently hydrogen or a straight, branched or cyclic, monovalent hydrocarbon group of 1 to 20 carbon atoms which may contain a heteroatom, and R 8 is a straight, branched or cyclic, monovalent hydrocarbon group of 4 to 30 carbon atoms which may contain a heteroatom.