申请人:Daicel Chemical Industries, Ltd.
公开号:US05834567A1
公开(公告)日:1998-11-10
Disclosed are a biodegradable copolymer and a biodegradable article molded therefrom, said copolymer having a number average molecular weight ranging from 1,000 to 1,000,000 consisting essentially of (A) from 5 to 99% by mol of epsilon-caprolactone or delta-valerolactone structural units and (B) from 95 to 1% by mol of oxetane structural units, said structural units being combined in the state of a block, and containing an organic aluminum-based Lewis acid represented by general formula (I) ##STR1## wherein R is an alkyl group having a carbon number ranging from 1 to 4, Y is independently selected from a substituted group, and p is any one of 1, 2 and 3. Also disclosed are block polymers of lactone and dimethyltrimethylene carbonate and blends of polylactone with polyoxetane.
本发明涉及一种可生物降解的共聚物和由其成型的可生物降解物品,所述共聚物的数量平均分子量范围为1,000至1,000,000,基本由(A)占5至99摩尔%的ε-己内酯或δ-戊内酯结构单元和(B)占95至1摩尔%的氧杂环丙烷结构单元组成,所述结构单元以块状状态结合,并含有通式(I)所表示的有机铝型路易斯酸:其中R是碳数为1至4的烷基,Y是独立选择的取代基,p是1、2和3中的任意一个。本发明还涉及内酯和二甲基三亚甲基碳酸酯的块共聚物以及聚内酯与聚氧杂环丙烷的混合物。