Patent ID: 7745104

Claim:
A bottom resist layer composition for a multilayer-resist film used in lithography comprising, at least, a polymer comprising a repeating unit represented by the following general formula (1), wherein R 1 represents a hydrogen atom or an acid labile group; X represents any one of a single bond, —Y—C(═O)—, and a linear or branched alkylene group having 1-4 carbon atoms; Y represents a single bond or a linear or branched alkylene group having 1-4 carbon atoms; Z represents any one of a methylene group, an oxygen atom, and a sulfur atom; R 2 and R 3 independently represent an alkyl group, an alkoxy group, an acetoxy group or an alkoxycarbonyl group each having 1-4 carbon atoms, or an aryl group having 6-10 carbon atoms; R 4 represents an alkyl group having 1-4 carbon atoms or an aryl group having 6-10 carbon atoms; R 5 represents a pyrene, fluorene, phenanthrene, chrysene, naphthacene, pentacene, or acenaphthene in which hydrogen atoms in part or in entirety may optionally be substituted with a halogen; n represents an integer of 0 to 4; p and q independently represent an integer of 0 to 6; R 6 represents a hydrogen atom or a methyl group; and a, b, c, d, and e satisfy 0<a<1.0, 0≦b≦0.9, 0≦c≦0.9, 0≦d≦0.9, 0≦e≦0.9, and 0<b+c+d+e<1.0.