Patent ID: 8268528

Claim:
A resist composition comprising: (A) a polymer comprising recurring units of the general formula (1) and recurring units of the general formulae (2a) or (2b), (B) a base polymer having a structure derived from lactone ring, hydroxyl group and/or maleic anhydride, said base polymer becoming soluble in alkaline developer under the action of acid, (C) a compound capable of generating an acid upon exposure to high-energy radiation, and (D) an organic solvent, wherein R 1 is hydrogen, methyl or trifluoromethyl, R 2a and R 2b are hydrogen or straight, branched or cyclic C 1 -C 15 alkyl, R 2a and R 2b may bond together to form a ring with the carbon atom to which they are attached, R 3 is a single bond or straight, branched or cyclic C 1 -C 15 alkylene, and R 4 is a straight, branched or cyclic C 1 -C 20 alkyl or fluoroalkyl which may contain —O— or —C(═O)—, wherein R 1 is hydrogen, methyl or trifluoromethyl, R 2a and R 2b are hydrogen or straight, branched or cyclic C 1 -C 15 alkyl, R 2a and R 2b may bond together to form a ring with the carbon atom to which they are attached, and R 5 is hydrogen, a straight, branched or cyclic C 1 -C 15 alkyl or fluoroalkyl, or an acid labile group, said polymer (A) being added to the resist composition in a total amount of 0.5 to 10 parts by weight per 100 parts by weight of the base polymer (B).