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    • 43. 发明授权
    • Phase boundary processes for preparing polycarbonates
    • 制备聚碳酸酯的相边界法
    • US07847051B2
    • 2010-12-07
    • US12398243
    • 2009-03-05
    • Wolfgang EbertChristian KordsRolf BachmannLars ObendorfJohan Vanden EyndeBert RuytinxJohann Seeba
    • Wolfgang EbertChristian KordsRolf BachmannLars ObendorfJohan Vanden EyndeBert RuytinxJohann Seeba
    • C08G64/00C08G63/18
    • C08G64/24
    • Continuous processes for preparing polycarbonates having a weight average molecular weight Mw, of 15,000 to 200,000 g/mol, the processes comprising reacting a dihydroxydiarylalkane and phosgene in the presence of a catalyst in a phase boundary process comprising: continuously dispersing in a disperser an organic phase comprising at least a portion of the phosgene and a solvent suitable for the polycarbonate and an aqueous phase comprising the dihydroxydiarylalkane, water and an alkali solution present in an amount of 1.5 to 2.5 moles per mole of the dihydroxydiarylalkane, to form a mixture; reacting the mixture in a first reactor with a residence time of less than 0.5 seconds; further reacting the mixture in a second reactor with addition of further alkali solution and, optionally, a chain terminator; and effecting further condensation in a third reactor with addition of further alkali solution and, optionally, a chain terminator, in the presence of the catalyst.
    • 用于制备重均分子量Mw为15,000至200,000g / mol的聚碳酸酯的连续方法,包括在相界过程中在催化剂存在下使二羟基二芳基烷烃和光气反应的方法包括:在分散机中连续分散有机相 包含至少一部分光气和适用于聚碳酸酯的溶剂和包含二羟基二芳基烷烃的水相,每摩尔二羟基二芳基烷烃存在的量为1.5至2.5摩尔的水和碱溶液形成混合物; 使混合物在第一反应器中反应,停留时间小于0.5秒; 在第二反应器中进一步使混合物反应,再加入另外的碱溶液和任选的链终止剂; 并在催化剂存在下,在第三反应器中进一步加入另外的碱溶液和任选的链终止剂。
    • 47. 发明申请
    • Process for the preparation of polycarbonate
    • 制备聚碳酸酯的方法
    • US20060063906A1
    • 2006-03-23
    • US11226093
    • 2005-09-14
    • Ulrich BlaschkeStefan WesternacherWolfgang EbertRainer Neumann
    • Ulrich BlaschkeStefan WesternacherWolfgang EbertRainer Neumann
    • C08G64/00
    • C08G64/24
    • 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.
    • 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。