Patent ID: 7214743

Claim:
A resist lower layer film material for a multilayer-resist film used in lithography in which the lower layer film material comprises a polymer having at least a repeating unit represented by the following general formula (1), wherein R 1 –R 4 independently represent any one of a hydrogen atom, a hydroxyl group, an alkyl group having 1–20 carbon atoms, an alkoxy group having 1–20 carbon atoms, an alkoxy carbonyl group having 1–20 carbon atoms, an acetoxy group, an aryl group having 6–10 carbon atoms, a hydroxy alkyl group having 1–6 carbon atoms, a hydroxy alkoxy group, an isocyanate group and a glycidyl ether group, or an organic group represented by the following general formula (2), and at least one of R 1 –R 4 is the organic group represented by the following general formula (2), R 5 –R 6 ) (2) wherein R 5 represents an alkylene group having 1–4 carbon atoms, and R 6 represents an alkyl group having 4–20 carbon atoms which has a cyclic structure, or an aryl group having 6–20 carbon atoms; Z is a cycloaliphatic hydrocarbon group; and a and b are positive numbers.