Patent ID: 7622242
Filing Date: 2009-11-24
Classification: G03F,Y10S

Abstract:
1. A resist composition comprising a polymer which changes its alkali solubility under the action of an acid as a base resin, and a copolymer comprising recurring units (a) and (b) of the general formula (1) as an additive, wherein R 1 is fluorine or trifluoromethyl, R 2 and R 3 are hydrogen or a straight, branched or cyclic C 1 -C 20 alkyl group, or R 2 and R 3 may bond together to form a ring with the carbon atom to which they are attached, and in this case, R 2 and R 3 together represent a straight, branched or cyclic C 2 -C 20 alkylene group, R 4 is hydrogen or an acid labile group, R