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    • 5. 发明授权
    • Azonaphthalene sulfonates as polymerization catalysts
    • 偶氮萘磺酸盐作为聚合催化剂
    • US06639043B1
    • 2003-10-28
    • US10180581
    • 2002-06-27
    • John Patrick LemmonRonald James Wroczynski
    • John Patrick LemmonRonald James Wroczynski
    • C08G6400
    • C08G64/307
    • The present invention relates to a synthetic method comprising contacting at least one diaryl carbonate 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 azonaphthalene sulfonates in combination with tetraalkylammonium or tetraalkylphosphonium compounds which serve as co-catalysts. The transesterification catalysts employed according to the method of the present invention provide polycarbonates having reduced levels of Fries rearrangement product relative to conventionally employed catalysts such as sodium hydroxide in combination with tetramethylammonium hydroxide co-catalyst.
    • 本发明涉及一种合成方法,其包括在熔融聚合条件下在酯基转移催化剂存在下使至少一种碳酸二芳基酯与一种或多种二羟基芳族化合物接触,得到产物聚碳酸酯。 根据本发明方法使用的酯交换催化剂是与用作助催化剂的四烷基铵或四烷基鏻化合物组合的氮杂萘磺酸盐。 根据本发明的方法使用的酯交换催化剂提供了相对于常规使用的催化剂如氢氧化钠与四甲基氢氧化铵助催化剂的组合,具有降低的Fries重排产物水平的聚碳酸酯。
    • 8. 发明授权
    • Salts of organic polyacids as polymerization catalysts
    • 有机多元酸作为聚合催化剂的盐
    • US06569986B1
    • 2003-05-27
    • US10007228
    • 2001-10-25
    • John Patrick LemmonRonald James WroczynskiOltea Puica Siclovan
    • John Patrick LemmonRonald James WroczynskiOltea Puica Siclovan
    • C08G6400
    • C08G64/307
    • The present invention relates to a synthetic method comprising contacting at least one diaryl carbonate 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 organic polyacids in combination with tetraalkyl ammonium or tetraalkyl phosphonium compounds which serve as co-catalysts. The transesterification catalysts are derived from polyacids containing both CO2H groups and SO3H groups and from polyacids containing exclusively CO2H groups or exclusively SO3H groups. The catalysts employed according to the method of the present invention provide polycarbonates having reduced levels of Fries rearrangement product relative to conventionally employed catalysts such as sodium hydroxide.
    • 本发明涉及一种合成方法,其包括在熔融聚合条件下在酯基转移催化剂存在下使至少一种碳酸二芳基酯与一种或多种二羟基芳族化合物接触,得到产物聚碳酸酯。 根据本发明方法使用的酯交换催化剂是作为助催化剂的四烷基铵或四烷基鏻化合物的有机多酸的碱金属盐和碱土金属盐。 酯交换催化剂衍生自含有CO 2 H基团和SO 3 H基团的多酸和仅含有CO 2 H基团或仅含有SO 3 H基团的多酸。 根据本发明的方法使用的催化剂提供了相对于常规使用的催化剂如氢氧化钠具有降低的Fries重排产物含量的聚碳酸酯。