Patent ID: 8722840

Claim:
A resist underlayer film forming composition for lithography comprising: a polymer; and a solvent, wherein in the polymer, diphenyl sulfone or a derivative thereof is introduced in the main chain of the polymer through an ether bond, and the polymer includes repeating structural units of Formula (1a) and Formula (1b): (where each of R 1 , R 2 , R 3 , and R 4 is independently a hydrogen atom, an C 1-13 alkyl group, a hydroxyl group, a methoxy group, a thiol group, an acetyl group, a nitro group, an allyl group, a phenyl group, or a naphthyl group; each of A 1 , A 2 , A 3 , A 4 , A 5 , and A 6 is independently a hydrogen atom, a methyl group, or an ethyl group; and Q is a divalent organic group between two carbon atoms) as the main chain and further a repeating structural unit of Formula (7):