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    • 2. 发明授权
    • Method for preparing polycarbonate by solid state polymerization
    • 通过固态聚合制备聚碳酸酯的方法
    • US5717056A
    • 1998-02-10
    • US767740
    • 1996-12-17
    • Godavarthi Satyanarayana VaradarajanSwaminathan SivaramBhaskar Bhairavnath IdageJoseph Anthony King, Jr.
    • Godavarthi Satyanarayana VaradarajanSwaminathan SivaramBhaskar Bhairavnath IdageJoseph Anthony King, Jr.
    • C08G64/14C08G64/20C08G64/30C08G64/42C08G64/00
    • C08G64/42C08G64/14C08G64/20C08G64/307
    • Solid state polycarbonate formation comprises an initial step of converting a precursor polycarbonate to an enhanced crystallinity precursor polycarbonate and a second step of polymerizing said enhanced crystallinity precursor polycarbonate in the solid state. Several options are employed. These include modifying the precursor polycarbonate by contact with a dihydroxy compound or diaryl carbonate, conversion of the precursor polycarbonate to the enhanced crystallinity polymer by contact with at least one compound selected from the group consisting of alkali metal hydroxides, tetraalkylammonium hydroxides, tetraalkylammonium carboxylates, tetraalkylphosphonium hydroxides and tetraalkylphosphonium carboxylates, and conducting the solid state polymerization in the presence of a catalytic amount of at least one tetralkylammonium or tetraalkylphosphonium carboxylate. The preferred tetralkylammonium compounds are tetramethylammonium maleate and tetramethylammonium hydroxide. Polymerization may be conducted in the presence of a solvent resistance-imparting monomer such as hydroquinone or resorcinol or a branching agent such as 1,1,1-tris(4-hydroxyphenyl)ethane.
    • 固体聚碳酸酯形成包括将前体聚碳酸酯转化为增强的结晶度前体聚碳酸酯的初始步骤和将固体状态的所述增强的结晶度前体聚碳酸酯聚合的第二步骤。 采用了几个选项。 这些包括通过与二羟基化合物或碳酸二芳基酯接触来改性前体聚碳酸酯,通过与至少一种选自碱金属氢氧化物,四烷基铵氢氧化物,四烷基铵羧酸盐,四烷基鏻盐的化合物接触,将前体聚碳酸酯转化为增强的结晶度聚合物 氢氧化物和四烷基鏻羧酸盐,并在催化量的至少一种四烷基铵或四烷基鏻羧酸盐的存在下进行固态聚合。 优选的四烷基铵化合物是马来酸四甲基铵和氢氧化四甲基铵。 聚合可以在耐溶剂性单体如氢醌或间苯二酚或支化剂如1,1,1-三(4-羟基苯基)乙烷的存在下进行。