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    • 3. 发明授权
    • Polyhydroxycarboxylic acid and its production process
    • 聚羟基羧酸及其生产工艺
    • US07067611B2
    • 2006-06-27
    • US10483039
    • 2002-07-05
    • Kazuyuki YamaneYukichika Kawakami
    • Kazuyuki YamaneYukichika Kawakami
    • C08G63/02
    • C08G63/80C08G63/08
    • Polyhydroxycarhoxylic acids are provided, which are controlled in terms of the rate of biodegradability, and give molded or otherwise formed articles that are of uniform quality with neither premature strength drop nor premature deterioration of retention of outside shape, and their production process is provided as well. The poly-hydroxycarboxylic acids are obtained by ring-opening polymerization of cyclic esters. The polyhydroxy-carboxylic acids have a weight-average molecular weight (Mw) in the range of 10,000 to 1,000,000, a molecular weight distribution in the range of 1.0 to 2.5 as represented by the weight-average molecular weight-to-number-average molecular weight ratio (Mw/Mn) and a yellowness index (YI) of 40 or less, and have a precisely controlled rate of biodegradability.
    • 提供了多羟基甲氧基酸,其以生物降解性的速率进行控制,并且得到具有均匀质量的成型制品或其它成型制品,既不过早强度下降也不会使外部形状保持力过早劣化,并且还提供其制造方法 。 多羟基羧酸通过环状酯的开环聚合得到。 多羟基羧酸的重均分子量(Mw)为10,000〜1,000,000,分子量分布范围为1.0〜2.5,以重均分子量与数均分子量 重量比(Mw / Mn)和黄色指数(YI)为40以下,具有精确控制的生物降解率。
    • 4. 发明授权
    • Process for the preparation of cyclic esters and method for purification of the same
    • 环酯的制备方法及其纯化方法
    • US06916939B2
    • 2005-07-12
    • US10344461
    • 2001-08-08
    • Kazuyuki YamaneYukichika KawakamiHajime HoshiKazuhiko Sunagawa
    • Kazuyuki YamaneYukichika KawakamiHajime HoshiKazuhiko Sunagawa
    • C07D319/12
    • C08J3/28C07D319/12C08J11/24C08J2300/14C08J2367/04Y02W30/706
    • The present invention provides a process for production of a cyclic ester by depolymerization of an aliphatic polyester. In the process, a mixture containing the aliphatic polyester and a specific polyalkylene glycol ether, which has a boiling point of 230-450° C. and a molecular weight of 150-450, is heated under normal or reduced pressure to a temperature at which depolymerization of the aliphatic polyester takes place. Then, a substantially homogeneous solution phase, consisting of the melt phase of the aliphatic polyester and the liquid phase of the polyalkylene glycol ether, is formed. Heating of the solution phase is continued to form the cyclic ester by depolymerization and distil out the cyclic ester together with the polyalkylene glycol ether, and then the cyclic ester is recovered from the distillate. The present invention also provides a process for purification of a crude cyclic ester by use of the specific polyalkylene glycol ether described above.
    • 本发明提供了通过脂肪族聚酯的解聚制备环状酯的方法。 在该方法中,将含有脂族聚酯和特定的聚亚烷基二醇醚的混合物在沸点为230-450℃,分子量为150-450的条件下,在正常或减压下加热至 发生脂肪族聚酯的解聚。 然后,形成由脂肪族聚酯的熔融相和聚亚烷基二醇醚的液相组成的基本均匀的溶液相。 溶液相的加热继续通过解聚形成环酯,并与聚亚烷基二醇醚一起蒸馏出环状酯,然后从馏出物中回收环状酯。 本发明还提供了通过使用上述特定的聚亚烷基二醇醚来纯化粗环酯的方法。
    • 10. 发明授权
    • Glycolide production process, and glycolic acid oligomer for glycolide production
    • 乙交酯生产过程和乙醇酸低聚物用于乙交酯生产
    • US07235673B2
    • 2007-06-26
    • US10472719
    • 2002-04-10
    • Kazuyuki YamaneYukichika Kawakami
    • Kazuyuki YamaneYukichika Kawakami
    • C07D319/12C08F301/00
    • C07D319/12
    • The invention relates to a glycolide production process wherein a depolymerization reaction system comprising a glycolic acid oligomer or a glycolic acid oligomer and a polar organic solvent is heated to depolymerize the glycolic acid oligomer into glycolide, the resulting glycolide or the glycolide and polar organic solvent are distilled out of the depolymerization reaction system, and the glycolide is recovered from distillates obtained by distillation. The glycolic acid oligomer or the glycolic acid oligomer and polar organic solvent are continuously or intermittently charged into the depolymerization reaction system, thereby carrying out depolymerization reactions continuously or repeatedly. During the depolymerization reactions, a compound having an alcoholic hydroxyl group is permitted to exist at a specific quantitative ratio in the depolymerization reaction system. The invention is also concerned with a glycolic acid oligomer for the production of glycolide, which is obtained by condensation of glycolic acid in the presence of the compound having an alcoholic hydroxyl group.
    • 本发明涉及一种乙交酯生产方法,其中加热包含乙醇酸低聚物或乙醇酸低聚物和极性有机溶剂的解聚反应体系,使乙醇酸低聚物解聚成乙交酯,得到的乙交酯或乙交酯和极性有机溶剂为 从解聚反应体系中蒸出,从蒸馏得到的馏出物中回收乙交酯。 将乙醇酸低聚物或乙醇酸低聚物和极性有机溶剂连续或间歇地加入到解聚反应体系中,从而连续或反复进行解聚反应。 在解聚反应中,在解聚反应体系中允许具有醇羟基的化合物以特定的定量比存在。 本发明还涉及通过乙醇酸在具有醇羟基的化合物的存在下缩合而获得的用于生产乙交酯的乙醇酸低聚物。