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    • 2. 发明授权
    • Manufacturing method for polycarbonate
    • 聚碳酸酯的制造方法
    • US06635710B2
    • 2003-10-21
    • US09208356
    • 1998-12-10
    • Kiyoshi KonoKazutoyo UnoSatoru MinamiTomoaki Shimoda
    • Kiyoshi KonoKazutoyo UnoSatoru MinamiTomoaki Shimoda
    • C08L5300
    • C08G64/307
    • A method for manufacturing polycarbonate by melt-polycondensing bisphenol and carbonic acid diester uses as catalyst an alkali metal compound and/or alkaline earth metal compound (a). The catalyst is added to the bisphenol prior to the melt polycondensation, in an effective amount, i.e., the amount of alkali metal compound and/or alkaline earth metal compound (a) that acts effectively as a catalyst, is contained in said bisphenol, and is controlled to have the same catalytic activity as 1×10−8 to 1×10−6 mole of bisphenol disodium salt per mole of pure bisphenol A. The method conducts the reaction efficiently from the initial stage in a stable manner to obtain polycarbonate with good color, good heat stability and color stability during molding and the like.
    • 通过双酚和碳酸二酯的熔融缩聚制备聚碳酸酯的方法使用碱金属化合物和/或碱土金属化合物(a)作为催化剂。 在熔融缩聚之前,将催化剂加入到双酚中,有效量,即所述双酚中含有用作催化剂的碱金属化合物和/或碱土金属化合物(a)的量,以及 被控制为具有与每摩尔纯双酚A 1x10 -8摩尔至1×10 -6摩尔的双酚二钠盐相同的催化活性。该方法以稳定的方式从初始阶段有效地进行反应以获得具有 良好的颜色,良好的热稳定性和成型时的颜色稳定性等。