An amphipathic co-Polymer having a weight average molecular weight of from 2,500 to 20,000 inclusive and comprising an addition polymer backbone and at least one C1-4 alkoxy polyethylene or Polyethylene copropylene glycol acrylate or methacrylate stabilizer unit where the backbone comprises up to 30% by weight of non-functional structural units and at least 70% by weight in total of stabilizer units and functional units where the functional units are optionally substituted styrene-containing units, hydroxy group-containig units and carboxyl group containing units, such that the proportions of hydroxy groups to carboxyl groups to styrene groups to propylene-oxy or ethylene-oxy groups are respectively 1 : 0.10-26.1 ; 0.28-25.0 ; 0.80-66.1.
一种两性共聚物,其重量平均分子量在 2,500 至 20,000 之间(含 20,000 磅),由加成聚合物主链和至少一个 C1-4 烷氧基聚
乙烯或聚
乙烯共
丙二醇丙烯酸酯或
甲基丙烯酸酯稳定剂单元组成,其中主链由重量比不超过 30% 的非官能结构单元和重量比不超过 70% 的稳定剂单元和官能单元(官能单元为可选取代的含
苯乙烯单元)组成、含羟基的单元和含羧基的单元,使羟基、羧基、
苯乙烯基团、
丙烯氧基或乙 烯氧基的比例分别为 1 :0.10-26.1 ; 0.28-25.0 ; 0.80-66.1.