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    • 2. 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。
    • 3. 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。
    • 7. 发明授权
    • Process for producing aromatic sulfide polymers
    • 生产芳香族硫化物聚合物的方法
    • US4495332A
    • 1985-01-22
    • US517837
    • 1983-07-27
    • Zenya ShiikiYo IizukaYukichika Kawakami
    • Zenya ShiikiYo IizukaYukichika Kawakami
    • C08F2/16C08G75/02
    • C08G75/0254
    • A process for obtaining aromatic sulfide polymer which has a markedly high molecular weight and can be readily formed into films, fibers, and other structures. The process comprises heating, in an aprotic solvent to a temperature of 100.degree. to 250.degree. C., (i) a dihaloaromatic compound and (ii) substantially anhydrous fine powder of the sulfide of an alkali or alkaline earth metal in the presence of (iii) substantially anhydrous fine powder of the carbonate of an alkali or alkaline earth metal, or of a mixture thereof with a hygroscopic inorganic salt and (iv) a strictly controlled very small amount of water dissolved in or solvated with the solvent.
    • 一种获得具有显着高分子量并可容易地形成薄膜,纤维和其它结构的芳香族硫化物聚合物的方法。 该方法包括在非质子溶剂中加热至100-250℃的温度,(i)二卤代芳族化合物和(ii)碱金属或碱土金属的硫化物的基本上无水的细粉末,在( iii)碱性或碱土金属碳酸盐或其吸湿性无机盐的混合物的基本上无水的细粉末和(iv)严格控制的非常少量的溶于溶剂或溶剂化的水。