Patent ID: 7666575

Claim:
An antireflective coating composition comprising, (i) a thermal acid generator; (ii) a crosslinkable copolymer comprising at least one unit with structure (1) and at least one unit with structure (2) and further where the crosslinkable polymer is free of acrylate groups and where structure (1) and (2) are, where, R is selected from H and C 1 -C 6 alkyl and R 1 is independently selected from H, hydroxyl, C 1 -C 6 alkyl, C 1 -C 6 alkylenehydroxy, C 1 -C 6 ester and C 1 -C 6 carboxylic acid, and n=1-5; and where, R and R 10 are independently selected from H and (C 1 -C 6 )alkyl, and m is 1-5; and (iii) a polymeric crosslinker comprising at least one unit of structure (6), where R 11 to R 13 are independently selected from H, (C 1 -C 6 )alkyl and aromatic group, and, R 14 and R 15 are independently (C 1 -C 10 ) alkyl.