Patent ID: 8877422

Claim:
A resist underlayer film composition, wherein the resist underlayer film composition is used for forming a resist underlayer film to be formed in an underlayer of an upper layer film and to be used for photolithography using a multilayer resist method and the composition contains a polymer represented by general formula (4-1) or (4-2) and an acid generator: wherein: R 1 to R 8 independently represent a hydrogen atom, a halogen atom, a hydroxyl group, an isocyanato group, a glycidyloxy group, a carboxyl group, an amino group, an alkoxyl group having 1 to 30 carbon atoms, an alkoxy carbonyl group having 1 to 30 carbon atoms, an alkanoyloxy group having 1 to 30 carbon atoms, or an optionally-substituted saturated or unsaturated organic group having 1 to 30 carbon atoms, wherein two substituent groups arbitrarily selected from each of R 1 to R 4 or R 5 to R 8 may be bonded to form a cyclic substituent group within a molecule; X represents a monovalent organic group with up to 30 carbon atoms and containing one or more of a 5-membered or a 6-membered aliphatic cyclic structure that contains a double bond; Y is different from X and represents a hydrogen atom or an optionally-substituted monovalent organic group having 1 to 30 carbon atoms; a, b, c, and d represent a ratio of each unit to a total number of repeating units and satisfy 0≦d<c<a+b<1 and a+b+c+d=1; and * indicates a bonding position.