Polyvinyl alcohol derivatives and crosslinked hydrogel contact lenses made therefrom
申请人:CIBA-GEIGY AG
公开号:EP0216074A2
公开(公告)日:1987-04-01
Polymers which are derivatives of a polyvinyl alcohol, having a weight average molecular weight of at least about 2,000, and containing from about 0.5 to about 90 percent, based on the number of hydroxyl groups in said polyvinyl alcohol, of units of the formula
wherein R' and R2 are independently alkylene, arylene, a divalent cycloaliphatic group, arylenealkylene, alkylenearylene or arylenealkylenearylene, n is 0 or 1, A' is oxygen or NR', A is oxygen, NR" or a bivalent ureido group, R3 is hydrogen or methyl, R4 is hydrogen, methyl or COOR5, where R5 is hydrogen or lower alkyl, with the proviso that if R3 is methyl, R4 is hydrogen, R' and R" are independently hydrogen or lower alkyl, these polymers being an addition reaction product of units of formula I with from 0 to about 80 units of a vinylic monomer per unit of formula I, and crosslinked hydrogel contact lenses made therefrom and their preparation.
聚合物是聚乙烯醇的衍生物,其重量平均分子量至少约为 2,000,根据所述聚乙烯醇中羟基的数量,含有约 0.5%至约 90%的式中单元。
其中 R' 和 R2 独立地为亚烷基、亚芳基、二价环脂族基团、亚芳基烷基、亚烷基芳基或亚芳基烷基芳基,n 为 0 或 1,A' 为氧或 NR',A 为氧、NR "或二价脲基,R3 为氢或甲基,R4 为氢、甲基或 COOR5,其中 R5 为氢或低级烷基、但如果 R3 是甲基,R4 是氢,R'和 R "独立地是氢或低级烷基,这些聚合物是式 I 单位与每式 I 单位 0 至约 80 单位乙烯基单体的加成反应产物,以及由其制成的交联水凝胶隐形眼镜及其制备方法。