Patent ID: 7670750

Claim:
A resist protective coating material comprising: a polymer comprising repeat units having the general formulae (1a) and (1b): wherein R 1a and R 1b are each independently hydrogen, fluorine or a straight or branched C 1 -C 4 alkyl or fluoroalkyl group, R 2a , R 2b , R 3a and R 3b are each independently hydrogen or a straight, branched or cyclic C 1 -C 20 alkyl group, or R 2a and R 2b , and R 3a and R 3b may bond together to form a ring with the carbon atom to which they are attached, and each of R 2a , R 2b , R 3a and R 3b is a straight, branched or cyclic C 1 -C 20 alkylene group when they form a ring, “a1” and “b1” are numbers satisfying 0<a1<1, 0<b1<1 and 0<a1+b1≦1, and n is an integer of 1 to 4, and a solvent selected from the group consisting of diisopentyl ether, di-n-pentyl ether, methylcyclopentyl ether, methylcyclohexyl ether, di-sec-pentyl ether, di-t-amyl ether and di-n-hexyl ether, said polymer having a weight average molecular weight of 1,000 to 500,000.