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    Process for producing lactide and process for producing polylactic acid from fermented lactic acid employed as starting material
    1.
    发明授权
    Process for producing lactide and process for producing polylactic acid from fermented lactic acid employed as starting material 有权

    公开(公告)号：US06569989B2

    公开(公告)日：2003-05-27

    申请号：US10020907

    申请日：2001-12-19

    申请人： Hitomi Ohara ,  Masahiro Ito ,  Seiji Sawa

    发明人： Hitomi Ohara ,  Masahiro Ito ,  Seiji Sawa

    IPC分类号： C08G6308

    CPC分类号： C08G63/08 ,  C07D319/12 ,  C08G63/78 ,  C08G63/785 ,  C12P7/56

    摘要： According to the present invention, a process for consistently producing lactide from ammonium lactate obtained by lactic fermentation, and a process for consistently producing polylactic acid from ammonium lactate obtained by lactic fermentation, are provided. A process for producing lactide, which comprises the steps of: (1) synthesizing lactate ester from ammonium lactate obtained by lactic fermentation; (2) polycondensing the lactate ester in the presence of a catalyst other than monobutyltin, whereby polylactic acid with a weight-average molecular weight of less than 15,000 (lactic acid prepolymer) is synthesized; and (3) depolymerizing the polylactic, whereby lactide is produced. A process for producing polylactic acid, which comprises the additional step of (4) ring-opening polymerizing said lactide, whereby polylactic acid is obtained. A process for producing lactate ester from ammonium lactate obtained by lactic fermentation.

    Amorphous polymeric polyaxial initiators and compliant crystalline copolymers therefrom
    2.
    发明授权
    Amorphous polymeric polyaxial initiators and compliant crystalline copolymers therefrom 有权
    无定形聚合多轴引发剂和顺应性结晶共聚物

    公开(公告)号：US06462169B1

    公开(公告)日：2002-10-08

    申请号：US09698527

    申请日：2000-10-27

    申请人： Shalaby W. Shalaby

    发明人： Shalaby W. Shalaby

    IPC分类号： C08G6308

    CPC分类号： C08G63/64 ,  A61L17/12 ,  A61L31/06 ,  C08G63/08 ,  C08L67/04

    摘要： An absorbable crystalline, monocentric polyaxial copolymer comprising a central carbon or nitrogen atom and at least three axes, each of which includes an amorphous flexible component adjacent and originating from the central atom and a rigid, crystallizable component extending outwardly from the amorphous, flexible component is disclosed along with the use of such copolymer in medical devices which may contain a bioactive agent.

    摘要翻译： 包含中心碳原子或氮原子和至少三个轴的可吸收结晶的单中心多轴共聚物，每个轴包括邻近并源自中心原子的无定形柔性组分和从无定形柔性组分向外延伸的刚性可结晶组分。 公开了在可能含有生物活性剂的医疗装置中使用这种共聚物。

    Lowly lactone-modified reactive monomer composition, acrylic polyol resins produced with the same, curable resin compositions and coating compositions
    7.
    发明授权
    Lowly lactone-modified reactive monomer composition, acrylic polyol resins produced with the same, curable resin compositions and coating compositions 失效
    低内酯改性反应性单体组合物，用其制备的丙烯酸多元醇树脂，可固化树脂组合物和涂料组合物

    公开(公告)号：US06767987B2

    公开(公告)日：2004-07-27

    申请号：US09890321

    申请日：2001-10-12

    申请人： Akira Okazaki

    发明人： Akira Okazaki

    IPC分类号： C08G6308

    CPC分类号： C08G18/68 ,  C08F20/28 ,  C08F290/062 ,  C08F290/12 ,  C08G18/0819 ,  C08G18/10 ,  C08G18/6233 ,  Y10S525/921 ,  C08G18/3228 ,  C08G18/72

    摘要： This invention provides a hydroxyalkyl(meth)acrylate composition modified by a small amount of lactones in which a proportion of monomers having two or more continuous chains of lactone is less than 50% (area % by GPC). This invention also provides methods for synthesizing such a composition. This invention also provides an acrylic polyol resin comprising the hydroxyalkyl(meth)acrylate composition, a carboxylic group-containing acrylate composition modified by a small amount of lactones, and a polyester unsaturated monomer modified by a small amount of lactones. Uses of these materials in curable resins, coating compositions, and finishing agents are also provided.

    摘要翻译： 本发明提供一种通过少量内酯修饰的（甲基）丙烯酸羟烷基酯组合物，其中具有两个或更多个连续链内酯的单体的比例小于50％（通过GPC的面积％）。 本发明还提供了合成这种组合物的方法。 本发明还提供了包含（甲基）丙烯酸羟烷基酯组合物，通过少量内酯改性的含羧基丙烯酸酯组合物和通过少量内酯改性的聚酯不饱和单体的丙烯酸多元醇树脂。 还提供了这些材料在可固化树脂，涂料组合物和整理剂中的用途。

    Preparing isotactic stereoblock poly(lactic acid)
    9.
    发明授权
    Preparing isotactic stereoblock poly(lactic acid) 失效
    制备全同立构嵌段聚（乳酸）

    公开(公告)号：US06538101B2

    公开(公告)日：2003-03-25

    申请号：US09957666

    申请日：2001-09-21

    申请人： Geoffrey W. Coates ,  Tina M. Ovitt

    发明人： Geoffrey W. Coates ,  Tina M. Ovitt

    IPC分类号： C08G6308

    CPC分类号： C08G63/08 ,  C08G63/06 ,  C08G63/823

    摘要： A stereospecific poly(lactic acid) is isotactic poly(lactic acid) having a number average molecular weight ranging from 10,000 to 200,000 grams per mole, with, on average, an equal number of poly (R) and poly (S) blocks where each block contains an average of 5 to 50 monomer units. Product was prepared by polymerizing rac-lactide in the presence of racemic catalyst consisting of: and the corresponding S-enantiomer or in the presence of racemic catalyst consisting of: and the corresponding S-enantiomer, wherein R is C1-C4 alkyl which is straight chain or branched.

    摘要翻译： 立体定向聚（乳酸）是数均分子量为10,000至200,000克/摩尔的全同立构聚（乳酸），平均具有相等数目的聚（R）和聚（S）嵌段，其中每个 块含有5至50个单体单元。 在由外消旋催化剂组成的外消旋催化剂和相应的S-对映异构体存在下或在由以下组成的外消旋催化剂存在下制备产物：和相应的S-对映异构体，其中R是直链的C 1 -C 4烷基 链或支链。