Patent ID: 7670745

Claim:
An alkali soluble polymer, which is obtained by polymerization of a monomer (A) represented by formula (1) with a radical polymerizable monomer (B) other than the monomer (A): where: R 1 , R 2 , and R 3 each represent a hydrogen or an alkyl group having 1 to 3 carbon atoms in which any hydrogen may be replaced by a fluorine; and R 4 , R 5 , R 6 , R 7 , and R 8 each represent a hydrogen, a halogen, —CN, —CF 3 , —OCF 3 , or —OH, an alkyl group having 1 to 5 carbon atoms in which any —CH 2 — may be replaced by —COO—, —OCO—, or —CO—, and any hydrogen may be replaced by a halogen, or an alkoxy group having 1 to 5 carbon atoms in which any hydrogen may be replaced by a halogen, provided that at least one of R 4 to R 8 is —OH, wherein the radical polymerizable monomer (B) includes one or more selected from the group consisting of a radical polymerizable monomer (b1) having an oxiranyl group; a radical polymerizable monomer (b2) having an oxetanyl group; a radical polymerizable monomer (b3) having an N-substituted maleimide: and a radical polymerizable monomer (b4) having a tricycle [5.2.1.0 2.6 ]decanyl group.