Biodegradable optically active copolymers and processes for producing
the same
    3.
    发明授权
    Biodegradable optically active copolymers and processes for producing the same 失效
    可生物降解的光学活性共聚物及其制备方法

    公开(公告)号:US5461139A

    公开(公告)日:1995-10-24

    申请号:US287916

    申请日:1994-08-09

    CPC分类号: C08G63/823 C08G63/64

    摘要: A biodegradable optically active copolymer is disclosed, which is represented by the general formula (I): ##STR1## wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 each represents a hydrogen atom or a methyl group; m and n each represents a natural number wherein the sum thereof gives 10 to 5,000; and C* represents an asymmetric carbon atom, and a process for producing the copolymer by ring-opening copolymerization of optically active .beta.-butyrolactone with a cyclic carbonate in the presence of catalyst. The biodegradable optically active copolymer of the present invention provides excellent biodegradability (enzyme degradability) and hydrolyzability.

    摘要翻译: 公开了一种可生物降解的光学活性共聚物,其由通式(I)表示:其中R 1,R 2,R 3和R 4各自表示氢原子或甲基; m和n各自表示其总和为10至5,000的自然数; C *表示不对称碳原子,以及在催化剂存在下通过光学活性β-丁内酯与环状碳酸酯开环共聚制备共聚物的方法。 本发明的生物降解性光学活性共聚物提供优异的生物降解性(酶降解性)和水解性。

    Process for producing &bgr;-butyrolactone homopolymer or copolymer
    5.
    发明授权
    Process for producing &bgr;-butyrolactone homopolymer or copolymer 失效
    生产β-丁内酯均聚物或共聚物的方法

    公开(公告)号:US06545112B2

    公开(公告)日:2003-04-08

    申请号:US09233204

    申请日:1999-01-19

    IPC分类号: C08F12400

    摘要: The object of the invention is to provides a process in which a high-molecular-weight &bgr;-butyrolactone homopolymer or copolymer being biodegradable, absorbable into the living body, useful as a functional polymeric material and superior in physical characteristics is produced with high yield and good productivity. This object is solved by a process for producing the homopolymer or copolymer of the invention, which comprises ring-opening polymerization of sole &bgr;-butyrolactone subjected previously to acid removal and dehydration treatment, or of said &bgr;-butyrolactone with other lactones, in the presence of a tin compound represented by the following formula (1) and/or formula (2): wherein R1 and R2 and R4 to R7 independently represent an alkyl group containing 1 to 12 carbon atoms which may have a branched chain, or a cycloalkyl group containing 5 to 7 carbon atoms, or a phenyl or naphthyl group which may have a substituent group, R3 represents an alkylene group containing 2 to 12 carbon atoms which may have a substituent group, a cyclopentane-1,2-ylene group or a cyclohexane-1,2-ylene group, and n is an integer of 1 to 10.

    摘要翻译: 本发明的目的是提供一种方法,其中生产可降解的可分解生物降解的高分子量β-丁内酯均聚物或共聚物可用作生物体,用作功能性聚合物材料并且具有优异的物理特性,其产率高, 良好的生产力。 该目的通过本发明的均聚物或共聚物的制备方法来解决,该方法包括先前进行酸去除和脱水处理的底部β-丁内酯或所述β-丁内酯与其它内酯的开环聚合, 的由下式(1)和/或式(2)表示的锡化合物:其中R 1和R 2和R 4至R 7独立地表示可以具有支链的含有1至12个碳原子的烷基或环烷基 或者可以具有取代基的苯基或萘基,R3表示可以具有取代基的含有2〜12个碳原子的亚烷基,环戊烷-1,2-亚基或环己烷 -1,2-亚基,n为1〜10的整数。