Manufacture of polylactide stereocomplexes
    3.
    发明授权
    Manufacture of polylactide stereocomplexes 失效
    聚交酯立体络合物的制造

    公开(公告)号:US5317064A

    公开(公告)日:1994-05-31

    申请号:US989048

    申请日:1992-12-11

    申请人: Maria Spinu

    发明人: Maria Spinu

    IPC分类号: C08G63/08 C08L67/04

    CPC分类号: C08G63/08 C08L67/04

    摘要: Polylactide stereocomplex is formed by mixing poly-D-lactide and L-lactide or poly-L-lactide and D-lactide and a lactide polymerization catalyst, and heating to polymerize the monomeric lactide, preferably under pressure. The parts are useful in medical devices such as bone screws.

    摘要翻译: 聚丙交酯立体络合物通过混合聚-D-丙交酯和L-丙交酯或聚-L-丙交酯和D-丙交酯和丙交酯聚合催化剂形成,并且加热以优选在压力下聚合单体丙交酯。 这些部件在诸如骨螺钉的医疗装置中是有用的。

    Degradable foam materials
    4.
    发明授权
    Degradable foam materials 失效
    可降解泡沫材料

    公开(公告)号:US5210108A

    公开(公告)日:1993-05-11

    申请号:US922269

    申请日:1992-07-29

    IPC分类号: C08G63/08 C08J9/12 C08J9/14

    摘要: Environmentally benign closed cell compositions made by foaming star-shaped polymers with a plurality of poly(hydroxy acid) chains attached to a central polyfunctional compound having a plurality of hydroxyl and/or amino groups.

    摘要翻译: 通过将具有多个连接到具有多个羟基和/或氨基的中心多官能化合物的多个(羟基酸)链发泡的星形聚合物制成的环境良性闭孔组合物。

    L-Dpolylactide copolymers with controlled morphology
    6.
    发明授权
    L-Dpolylactide copolymers with controlled morphology 失效
    具有受控形态的L-对 - 丙烯酰胺共聚物

    公开(公告)号:US5270400A

    公开(公告)日:1993-12-14

    申请号:US816433

    申请日:1991-12-31

    申请人: Maria Spinu

    发明人: Maria Spinu

    IPC分类号: C08G63/08 C08G63/664

    CPC分类号: C08G63/664 C08G63/08

    摘要: Linear block copolymers are disclosed. The polymers comprise a plurality of alternating polymeric blocks of amorphous copolymers of L-lactide and D-lactide with semicrystalline blocks of either L-lactide homopolymer or D-lactide homopolymer. The molecular weight can be built up by either of two techniques. The first technique is to use a chain extending agent such as a diacyl chloride or a diisocyanate to link a plurality of the preformed block copolymers. The second technique is to polymerize additional alternating amorphous and semicrystalline onto the original alternating block copolymers.

    摘要翻译: 公开了线性嵌段共聚物。 聚合物包含多个交替的L-丙交酯和D-丙交酯与L-丙交酯均聚物或D-丙交酯均聚物的半结晶嵌段的无定形共聚物的聚合物嵌段。 分子量可以通过两种技术之一来构建。 第一种技术是使用双链酰氯或二异氰酸酯等增链剂连接多个预制嵌段共聚物。 第二种技术是将另外的交替的无定形和半结晶聚合到原始的交替嵌段共聚物上。

    Polyvinyl alcohol esterified with lactic acid and process therefor
    7.
    发明授权
    Polyvinyl alcohol esterified with lactic acid and process therefor 失效
    用乳酸酯化的聚乙烯醇及其工艺

    公开(公告)号:US5331045A

    公开(公告)日:1994-07-19

    申请号:US17234

    申请日:1993-02-12

    申请人: Maria Spinu

    发明人: Maria Spinu

    IPC分类号: C08F8/14 C08L29/02 C08L29/04

    CPC分类号: C08F8/14

    摘要: Polyvinyl alcohol esterified by lactic is produced by dissolving polyvinyl alcohol and lactic acid in water, and removing the water by volatilization at a temperature of 75.degree. C. to 175.degree. C. The lactic acid esterified polyvinyl alcohol is useful as a molding resin, and in films, fibers and adhesives.

    摘要翻译: 用乳酸酯化的聚乙烯醇是通过将聚乙烯醇和乳酸溶于水中制得的,并在75℃至175℃的温度下通过挥发除去水分。乳酸酯化的聚乙烯醇可用作模制树脂,和 在薄膜,纤维和粘合剂中。

    Alternating (ABA)N polylactide block copolymers
    8.
    发明授权
    Alternating (ABA)N polylactide block copolymers 失效
    交替(ABA)N聚丙交酯嵌段共聚物

    公开(公告)号:US5202413A

    公开(公告)日:1993-04-13

    申请号:US816201

    申请日:1991-12-31

    申请人: Maria Spinu

    发明人: Maria Spinu

    摘要: Polymers of the general formula R--(A-B-A-I)-.sub.x A-B-A-R and their preparation are disclosed. In the general formula, -A- is a polyhydroxy acid residue preferably a polymer of either 98 to 100% L-lactide or 98 to 100% D-lactide having a molecular weight of 500 to 40,000 and preferably 2,000 to 20,000, -B- is an oligomeric diol or diamine residue, having a number average molecular weight of 500 to 20,000 and preferably 2,000 to 8,000. The polymers are prepared by polymerizing a lactone onto the diol or diamine followed by reacting the resulting polymeric H-A-B-A-H with an diisocyanate or diacyl chloride to form the -L- chain extending units in the general formula.

    摘要翻译: 公开了通式R-(A-B-A-I)-xA-B-A-R的聚合物及其制备方法。 在通式中,-A-是多羟基酸残基,优选分子量为500至40,000,优选2,000至20,000,-B-的交联剂的98至100%的L-丙交酯或98至100%的D-丙交酯的聚合物, 是数均分子量为500〜20,000,优选为2,000〜8,000的低聚二醇或二胺残基。 通过将内酯聚合到二醇或二胺上制备聚合物,然后使得到的聚合物H-A-B-A-H与二异氰酸酯或二酰氯反应,形成通式中的-L-延伸单元。