Process for the preparation of polycarbonate
    54.
    发明申请
    Process for the preparation of polycarbonate 审中-公开
    制备聚碳酸酯的方法

    公开(公告)号:US20060063906A1

    公开(公告)日:2006-03-23

    申请号:US11226093

    申请日:2005-09-14

    IPC分类号: C08G64/00

    CPC分类号: C08G64/24

    摘要: A process for the preparation of polycarbonate by the phase interface process is disclosed. The process includes (a) preparing a sodium hydroxide solution by chloralkali electrolysis, the solution containing not more than 30 ppm sodium chlorate relative to the weight of sodium hydroxide, and (b) reacting an aqueous solution of said sodium hydroxide with at least one dihydoxydiarylalkane to obtain a solution of disodium salt and (c) reacting said solution of disodium salt with phosgene in the presence of at least one organic solvent, a chain terminator and optionally a branching agent to obtain an oligocarbonate, and (d) condensing the oligocarbonate in the presence of at least one catalyst to obtain a material system containing polycarbonate and organic solvent and (e) separating off of the organic phase from said material system. The polycarbonate prepared by the inventive process is characterized by its low yellowness index.

    摘要翻译: 公开了通过相界过程制备聚碳酸酯的方法。 该方法包括(a)通过氯碱电解制备氢氧化钠溶液,所述溶液相对于氢氧化钠的重量含有不超过30ppm的氯酸钠,和(b)使所述氢氧化钠的水溶液与至少一种二氢二芳基烷烃 以获得二钠盐溶液,和(c)在至少一种有机溶剂,链终止剂和任选的支化剂的存在下,使所述二钠盐与光气反应,得到低聚碳酸酯,和(d)将低聚碳酸酯 存在至少一种催化剂以获得含有聚碳酸酯和有机溶剂的材料体系,和(e)从所述材料体系中分离有机相。 通过本发明方法制备的聚碳酸酯的特征在于其低黄度指数。

    Working up of polymer synthesis solutions
    55.
    发明授权
    Working up of polymer synthesis solutions 失效
    加工聚合物合成溶液

    公开(公告)号:US06716933B2

    公开(公告)日:2004-04-06

    申请号:US10196022

    申请日:2002-07-16

    IPC分类号: C08G6400

    CPC分类号: C08F6/10 C08G64/40

    摘要: The present invention relates to a process for working up solutions of polymers in organic solvents contaminated by alkaline constituents, using homogeneously soluble acids, especially by the introduction of an acid gas, and subsequent washing, and to the polymers so obtainable, which are distinguished by the fact that, on treatment with moist heat (sterilisation), only few defects caused by decomposition are formed, to the use thereof in the production of extrudates and molded specimen, and to the extrudates and molded specimen produced from those polymers themselves.

    摘要翻译: 本发明涉及使用均匀溶解的酸,特别是通过引入酸性气体和随后的洗涤以及可获得的聚合物来处理聚合物在被碱性成分污染的有机溶剂中的溶液的方法以及可获得的聚合物, 在湿热处理(灭菌)中,形成仅有少量由分解引起的缺陷,用于生产挤出物和模塑试样,以及由这些聚合物本身制备的挤出物和模塑试样。