Patent ID: 6927266

Claim:
A bottom anti-reflective coat forming composition for lithography processes in semiconductor device preparation, wherein the bottom anti-reflective coat forming composition has improved dry etching rate, and comprises resin containing a structural unit comprising maleimide or a derivative thereof, wherein the resin comprises the structural unit shown in Formula (2) wherein each R 1 , R 2 and R 3 is independent of one another; R 1 is hydrogen, halogen, or substituted or unsubstituted C 1 -C 10 alkyl group; R 2 is hydrogen, halogen or methyl group; R 3 is hydrogen or substituted or unsubstituted C 1 -C 10 alkyl group; x is number 1-10300; and y is number 0-12100, and is a polymer comprising 10-95 mol % of the maleimide structural unit (A) and 90-5 mol % of the (meth)acrylate structural unit (B), based on the sum of the maleimide structural unit (A) and the (meth)acrylate structural unit (B) in the polymer, and wherein said composition further comprises crosslinking agent having at least two crosslinking forming functional groups.