A copolymer of (a) an unsubstituted 4-hydroxystyrene monomer and (b) a substituted 4-hydroxystyrene monomer of the formula
wherein A, B, C, and D are independently H or C₁ to C₃ alkyl and wherein at least one of A, B, C and D is C₁ to C₃ alkyl; and wherein said copolymer has a molecular weight of from about 800 to about 100,000; and wherein the mol ratio of monomer (a) to monomer (b) ranges from about 3:1 to about 1:3.
一种(a)未取代的
4-羟基苯乙烯单体与(b)式中的取代的
4-羟基苯乙烯单体的共聚物
其中 A、B、C 和 D 独立地为 H 或 C₁ 至 C₃ 烷基,且 A、B、C 和 D 中至少有一个为 C₁ 至 C₃ 烷基;且所述共聚物的分子量为约 800 至约 100,000;且单体 (a) 与单体 (b) 的摩尔比为约 3:1 至约 1:3。