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    Polyhydroxycarboxylic acid and preparation process thereof
    5.
    发明授权
    Polyhydroxycarboxylic acid and preparation process thereof 失效
    聚羟基羧酸及其制备方法

    公开(公告)号：US5310865A

    公开(公告)日：1994-05-10

    申请号：US992696

    申请日：1992-12-18

    申请人： Katashi Enomoto ,  Masanobu Ajioka ,  Akihiro Yamaguchi

    发明人： Katashi Enomoto ,  Masanobu Ajioka ,  Akihiro Yamaguchi

    IPC分类号： C08G63/06

    CPC分类号： C08G63/06

    摘要： A process for preparing polyhydroxycarboxylic acid by conducting a dehydration condensation of a hydroxycarboxylic acid or an oligomer thereof in a reaction mixture containing an organic solvent substantially in the absence of water and the polyhydroxycarboxylic acid thus obtained. The process provides polyhydroxycarboxylic acid having excellent properties and processability.

    摘要翻译： 通过在含有基本上不存在水的有机溶剂和由此得到的聚羟基羧酸的反应混合物中进行羟基羧酸或其低聚物的脱水缩合制备聚羟基羧酸的方法。 该方法提供具有优异性能和加工性能的聚羟基羧酸。

    Preparation process of .alpha.-aspartyl-L-phenylalanine methyl ester
    7.
    发明授权
    Preparation process of .alpha.-aspartyl-L-phenylalanine methyl ester 失效
    α-天门冬酰基-L-苯丙氨酸甲酯的制备方法

    公开(公告)号：US5424477A

    公开(公告)日：1995-06-13

    申请号：US128739

    申请日：1993-09-30

    申请人： Chojiro Higuchi ,  Ikumi Kitada ,  Akinori Nagatomo ,  Katashi Enomoto ,  Masanobu Ajioka ,  Akihiro Yamaguchi

    发明人： Chojiro Higuchi ,  Ikumi Kitada ,  Akinori Nagatomo ,  Katashi Enomoto ,  Masanobu Ajioka ,  Akihiro Yamaguchi

    IPC分类号： A23L27/30 ,  C07K5/075 ,  C07C209/06

    CPC分类号： C07K5/0613

    摘要： .alpha.-L-Aspartyl-L-phenylalanine methyl ester (.alpha.-APM) is prepared by catalytic hydrogenation of N-benzyloxycarbonyl-.alpha.-L-aspartyl-L-phenylalanine methyl ester (Z-.alpha.-APM). The catalytic hydrogenation is conducted in an aqueous suspension containing the Z-.alpha.-APM in the form of particles whose average particle size is not greater than 800 .mu.m. The starting Z-.alpha.-APM may contain up to 30 wt. % of its .beta.-isomer provided that the process additionally includes recrystallization of the .alpha.-APM, collection of the .alpha.-APM by filtration and recycling of the filtrate for use in the aqueous suspension of Z-.alpha.-APM.

    摘要翻译： 通过N-苄氧羰基-α-L-天冬氨酰-L-苯丙氨酸甲酯（Z-α-APM）的催化氢化制备α-L-天冬氨酰-L-苯丙氨酸甲酯（α-APM）。 催化氢化在含有平均粒径不大于800μm的颗粒形式的Z-α-APM的水性悬浮液中进行。 起始的Z-α-APM可含有至多30wt。 ％的β-异构体，条件是该方法另外包括α-APM的重结晶，通过过滤收集α-APM并再循环用于Z-α-APM的水悬浮液中的滤液。

    Degradable aliphatic polyester formed products
    8.
    发明授权
    Degradable aliphatic polyester formed products 失效
    可降解脂肪族聚酯成型产品

    公开(公告)号：US5763098A

    公开(公告)日：1998-06-09

    申请号：US892265

    申请日：1997-07-14

    申请人： Taiji Kameoka ,  Takeshi Kashima ,  Masanobu Ajioka ,  Akihiro Yamaguchi ,  Kazuhiko Suzuki

    发明人： Taiji Kameoka ,  Takeshi Kashima ,  Masanobu Ajioka ,  Akihiro Yamaguchi ,  Kazuhiko Suzuki

    IPC分类号： B32B27/10 ,  B32B27/36 ,  C08G63/16 ,  C08G63/60 ,  C08G63/81 ,  C08L67/00 ,  C08L67/02 ,  D04H1/42 ,  D04H13/00 ,  D06N7/04 ,  C08G63/02

    CPC分类号： C08L67/02 ,  B32B27/10 ,  B32B27/36 ,  C08G63/16 ,  C08G63/60 ,  C08G63/81 ,  C08L67/00 ,  D04H1/4258 ,  D04H1/435 ,  C08L2201/06 ,  Y10T428/24355 ,  Y10T428/249921 ,  Y10T428/2913 ,  Y10T428/3179

    摘要： Formed products such as foams, fabrics for industrial materials, filaments, nonwoven fabrics, composite materials and films which are degradable after use with ease in the natural environment are prepared by using a high molecular weight aliphatic polyester obtained by direct polycondensation of an aliphatic polyhydric alcohol with aliphatic polybasic acid or additionally hydroxycarboxylic acid or oligomers of these materials in a reaction mixture containing a solvent. Foams have excellent thermal insulation and strength; fabrics are excellent in thermal insulation, strength and elongation and can be used for industrial materials; filaments have sufficient strength, flexibility and degradability in a living body and can be used for bioabsorbable surgical filament and fishing lines; nonwoven fabrics can be obtained by bonding a web of filaments and have excellent strength and feeling; composite materials can be prepared by adhering or impregnating fiber, paper, film and others of cellulosics and have excellent strength and water resistance, good flexibility and folding resistance, simultaneously have degradability in the natural environment, and can dissolve polymer films on the surface with ease under alkaline conditions to recover cellulosics alone; and films are excellent in heat resistance and strength.

    摘要翻译： 通过使用通过脂肪族多元醇的直接缩聚得到的高分子量脂肪族聚酯，可以制备如在天然环境中容易使用后可降解的泡沫，工业用材料，长丝，无纺布，复合材料和薄膜等成型产品 与脂族多元酸或另外的羟基羧酸或这些物质的低聚物在含有溶剂的反应混合物中。 泡沫具有优良的保温和强度; 织物绝热性，强度和伸长率优良，可用于工业材料; 细丝在活体中具有足够的强度，柔韧性和降解性，可用于生物可吸收的手术细丝和钓鱼线; 非织造织物可以通过粘合丝网而获得，并且具有优异的强度和感觉; 复合材料可以通过粘合或浸渍纤维素的纤维，纸，膜等而具有优异的强度和耐水性，良好的柔韧性和耐折叠性，同时在天然环境中具有降解性，并且可以容易地溶解表面上的聚合物膜 在碱性条件下单独回收纤维素; 并且膜的耐热性和强度优异。