Patent ID: 8597868
Filing Date: 2013-12-03
Classification: G03F

Abstract:
1. A chemically amplified negative resist composition comprising (A) a base polymer, (B) an acid generator, and (C) a nitrogen-containing compound as a basic component, said base polymer being (i) a polymer comprising recurring units of the general formulae (1) and (2): wherein A and B each are a single bond or a C 1 -C 10 alkylene group which may be separated by an ether bond, R 1 is each independently hydrogen or methyl, R x is each independently hydrogen or a C 1 -C 6 alkyl group, X is hydrogen, a straight, branched or cyclic C 1 -C 20 alkyl group, C 2 -C 20 alkoxyalkyl group, C 2 -C 20 alkylthioalkyl group, halogen, nitro, or cyano, sulfinyl or sulfonyl group, Y is a C 1 -C 20 alkyl group or C 2 -C 20 acyl group, a and c each are an integer of 0 to 4, b is an integer of 1 to 5, d is an integer of 0 to 5, P and Q each are 0 or 1, s and t each are an integer of 0 to 2, said polymer being combined with a crosslinker capable of forming crosslinks through electrophilic reaction with formula (1) in the presence of an acid, (ii) said polymer further comprising recurring units capable of forming crosslinks through electrophilic reaction with formula (1) in the presence of an acid, or (iii) said polymer further comprising recurring units having a crosslinking function, being combined with a crosslinker capable of forming crosslinks through electrophilic reaction with formula (1) in the presence of an acid, at least a portion of said base polymer having an alkylthio group of the general formula (3): wherein R 3 is a straight, branched or cyclic C 1 -C 20 alkyl group, C 2 -C 20 hydroxyalkyl group, C 2 -C 20 alkoxyalkyl group, C 1 -C 20 mercaptoalkyl group or C 2 -C 20 alkylthioalkyl group, said base polymer having a weight average molecular weight of 1,000 to 2,500.