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    • 35. 发明授权
    • Compounds of antimony and germanium as catalysts for melt polycarbonate
    • 锑和锗的化合物作为熔融聚碳酸酯的催化剂
    • US06610814B2
    • 2003-08-26
    • US10007347
    • 2001-10-25
    • John Patrick LemmonOltea Puica Siclovan
    • John Patrick LemmonOltea Puica Siclovan
    • C08G6400
    • C08G64/307
    • The present invention relates to a synthetic method in which one or more diaryl carbonates is reacted with one or more dihydroxy aromatic compounds in the presence of a transesterification catalyst under melt polymerization conditions to afford a product polycarbonate. The transesterifcation catalysts used according to the method of the present invention are alkali metal salts and alkaline earth metal salts of antimony oxides or germanium oxides in combination with tetraalkyl ammonium or tetraalkyl phosphonium compounds which serve as co-catalysts. The antimony oxide derivative “tartar emetic”, structure IV, was shown to possess excellent activity as a transesterifcation catalyst for the preparation of polycarbonate under melt polymerization conditions. The catalysts employed according to the method of the present invention provide polycarbonates having substantial molecular weight (Mn˜7000-10000 daltons) and reduced levels of Fries rearrangement product relative to conventionally prepared melt polycarbonate having a similar molecular weight.
    • 本发明涉及在熔融聚合条件下,在酯交换催化剂存在下,使一种或多种碳酸二芳基酯与一种或多种二羟基芳族化合物反应以得到产物聚碳酸酯的合成方法。 根据本发明方法使用的酯交换催化剂是用作助催化剂的四烷基铵或四烷基鏻化合物的氧化锑或氧化锗的碱金属盐和碱土金属盐。 显示结构IV的氧化锑衍生物“鞑靼呕吐物”在熔融聚合条件下作为用于制备聚碳酸酯的酯交换催化剂具有优异的活性。 根据本发明的方法使用的催化剂相对于具有相似分子量的常规制备的熔融聚碳酸酯提供具有相当大分子量(Mn〜7000-10000道尔顿)的聚碳酸酯和降低的Fries重排产物含量。