Patent ID: 8088546
Filing Date: 2012-01-03
Classification: C08F,G03F

Abstract:
1. An underlayer coating forming composition for lithography comprising a polymer having structural units of formulae (A-1) and (B-1): wherein R 1 is hydrogen atom or methyl group, X is bromine atom, Y is a group selected from the group consisting of hydrogen atom, C 1-6 alkyl group, C 1-6 alkoxy group, cyano group, nitro group, carboxy group, hydroxy group, C 1-6 alkoxycarbonyl group and C 1-6 thioalkyl group, m is an integer of 1 to 7, n is an integer of 0 to 6 and m+n =7, in case where n is 2 or more, each Y group is either identical or different, R 2 is hydrogen atom or methyl group, A 1 is hydroxyphenyl group, hydroxy group, 2-hydroxyethyloxy group or —COOR 3 wherein R 3 is C 2-6 alkyl group substituted with at least one hydroxy group, and a solvent, wherein in structural units constituting the polymer, the structural unit of formula (A-1) is contained in a molar ratio of 0.3 to 0.9 and the structural unit of formula (B-1) is contained in a molar ratio of 0.1 to 0.7.