Preparation process of polyhydroxycarboxylic acid
    2.
    发明授权
    Preparation process of polyhydroxycarboxylic acid 失效
    聚羟基羧酸的制备方法

    公开(公告)号:US5444143A

    公开(公告)日:1995-08-22

    申请号:US170873

    申请日:1993-12-21

    IPC分类号: C08G63/06

    CPC分类号: C08G63/06

    摘要: A preparation process of polyhydroxycarboxylic acid having an inherent viscosity of 0.3 dl/g or more by dehydrating polycondensation of lactic acid containing hydroxycarboxylic acid in an organic solvent in the presence or absence of a catalyst, comprising using a hydroxycarboxylic acid raw material which comprises one or more impurities selected from the group consisting of methanol, ethanol, acetic acid, pyruvic acid, fumaric acid, methyl lactate, ethyl lactate and butyl lactate in a total amount of 0.3% by mole or less for the amount of said hydroxycarboxylic acid raw material.

    摘要翻译: 在有机溶剂存在或不存在催化剂的情况下,通过使有机溶剂中含有羟基羧酸的乳酸进行脱水缩聚,其特性粘度为0.3dl / g以上的聚羟基羧酸的制备方法,包括使用羟基羧酸原料,其包含一种或多种 对于所述羟基羧酸原料的量,总量为0.3摩尔%以下的更多的杂质选自甲醇,乙醇,乙酸,丙酮酸,富马酸,乳酸甲酯,乳酸乙酯和乳酸丁酯。

    Preparation process of polyhydroxycarboxylic acid
    3.
    发明授权
    Preparation process of polyhydroxycarboxylic acid 失效
    聚羟基羧酸的制备方法

    公开(公告)号:US5770683A

    公开(公告)日:1998-06-23

    申请号:US546311

    申请日:1995-10-20

    IPC分类号: C08G63/06 C08G63/91

    CPC分类号: C08G63/912 C08G63/06

    摘要: A preparation process of polyhydroxycarboxylic acid comprising conducting dehydration polycondensation of hydroxycarboxylic acid or an oligomer of the same in a reaction mixture containing said hydroxycarboxylic acid or the oligomer of the same and an organic solvent substantially in the absence of water to give polyhydroxycarboxylic acid having an weight average molecular weight of 50,000 or more, successively mixing the reaction mixture containing said polyhydroxycarboxylic acid with at least one binder selected from the group consisting of (1) polyisocyanate compound, (2) polybasic acid anhydride, (3) cyclic imino ester, (4) cyclic imino ether, (5) aromatic hydroxycarboxylic acid, (6) polyamino compound, (7) polyhydric alcohol, (8) epoxy compound, (9) polyfunctional aziridine compound, (10) lactam, (11) lactone, and (12) diethylene glycol bischloroforate, and reacting to obtain polyhydroxycarboxylic acid having a weight average molecular weight of 100,000 or more the polyhydroxycarboxylic acid which is obtained by the process has a weight average molecular weight of 100,000 or more, has satisfactory mechanical strength in the form of molded articles and is useful as a degradable polymer for substituting medical materials and general purpose resins.

    摘要翻译: 一种聚羟基羧酸的制备方法,其包括在含有羟基羧酸或其低聚物的反应混合物中进行羟基羧酸或其低聚物的脱水缩聚,基本上不存在水,得到具有重量的多羟基羧酸 将(1)多异氰酸酯化合物,(2)多元酸酐,(3)环状亚氨基酯,(4)的多元酸酐,(4) )环状亚氨基醚,(5)芳族羟基羧酸,(6)聚氨基化合物,(7)多元醇,(8)环氧化合物,(9)多官能氮丙啶化合物,(10)内酰胺,(11)内酯和(12 )二甘醇双氯氟酸盐,并且反应得到重均分子量为100,000以上的聚羟基
    羧酸 通过该方法获得的氧酸的重均分子量为100,000以上,成型品的机械强度良好,作为用于代替医用材料和通用树脂的可降解聚合物是有用的。

    Purification process of polyhydroxycarboxylic acid
    4.
    发明授权
    Purification process of polyhydroxycarboxylic acid 失效
    聚羟基羧酸的纯化过程

    公开(公告)号:US5616783A

    公开(公告)日:1997-04-01

    申请号:US535638

    申请日:1995-09-28

    CPC分类号: C08G63/90

    摘要: A purification process for polyhydroxycarboxylic acids which comprises dissolving polyhydroxycarboxylic acid in an water-immiscible phenol or an organic solvent containing said water-immiscible phenol, successively bringing the resulting solution into contact with water which contains an acidic material, separating the organic layer from an aqueous layer, and isolating polyhydroxycarboxylic acid from the organic layer. The process can efficiently remove a catalyst contained in the polyhydroxycarboxylic acid prepared in the presence of the catalyst, does not require polyhydroxycarboxylic acid to be in the form of a solid, and can treat polyhydroxycarboxylic acid in a higher concentration as compared with using chlorinated hydrocarbon as a solvent.

    摘要翻译: 一种聚羟基羧酸的纯化方法,其包括将聚羟基羧酸溶解在与水不混溶的苯酚或含有水不混溶性苯酚的有机溶剂中,依次将所得溶液与含有酸性物质的水接触,将有机层与水 层,并从有机层中分离聚羟基羧酸。 该方法可以有效地除去在催化剂存在下制备的聚羟基羧酸中所含的催化剂,不需要聚羟基羧酸为固体形式,并且与使用氯化烃作为相比,可以处理更高浓度的聚羟基羧酸 溶剂。

    Lactic acid containing hydroxycarboxylic acid for the preparation of
polhydroxycarboxylic acid
    5.
    发明授权
    Lactic acid containing hydroxycarboxylic acid for the preparation of polhydroxycarboxylic acid 失效
    含有羟基羧酸的乳酸用于制备聚羟基羧酸

    公开(公告)号:US5512653A

    公开(公告)日:1996-04-30

    申请号:US488091

    申请日:1995-06-07

    IPC分类号: C08G63/06

    CPC分类号: C08G63/06

    摘要: A preparation process of polyhydroxycarboxylic acid having an inherent viscosity of 0.3 dl/g or more by dehydrating polycondensation of lactic acid containing hydroxycarboxylic acid in an organic solvent in the presence or absence of a catalyst, comprising using a hydroxycarboxylic acid raw material which comprises one or more impurities selected from the group consisting of methanol, ethanol, acetic acid, pyruvic acid, fumaric acid, methyl lactate, ethyl lactate and butyl lactate in a total amount of 0.3% by mole or less for the amount of said hydroxycarboxylic acid raw material.

    摘要翻译: 在有机溶剂存在或不存在催化剂的情况下,通过使有机溶剂中含有羟基羧酸的乳酸进行脱水缩聚,其特性粘度为0.3dl / g以上的聚羟基羧酸的制备方法,包括使用羟基羧酸原料,其包含一种或多种 对于所述羟基羧酸原料的量,总量为0.3摩尔%以下的更多的杂质选自甲醇,乙醇,乙酸,丙酮酸,富马酸,乳酸甲酯,乳酸乙酯和乳酸丁酯。