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    • 9. 发明申请
    • METHOD FOR MAKING COPOLYCARBONATES
    • 制备共聚碳酸酯的方法
    • WO2004041907A1
    • 2004-05-21
    • PCT/US2003/033716
    • 2003-10-24
    • GENERAL ELECTRIC COMPANYLENS, Jan, PleunKAMPS, Jan, Henk
    • LENS, Jan, PleunKAMPS, Jan, Henk
    • C08G64/30
    • C08G64/307C08G64/06
    • A melt polymerization method is presented which permits the efficient preparation of copolycarbonates in which one or more of the constituent dehydroxy aromatic compounds employed is relatively volatile, having a boiling point of less than about 340 °C. Relatively volatile dihydroxy aromatic compounds are illustrated by dihydroxybenzenes such as hydroquinone, methyl hydroquinone and resorcinol. Known methods for the preparation of members of this class of copolycarbonates, such as the melt reaction of bisphenol A and resorcinol diphenyl carbonate in the presence of sodium hydroxide and tetraalkylammonium salt catalyst systems, suffer losses in efficiency due to the resorcinol being entrained out of the polymerization mixture with by-product phenol. Catalyst systems including quaternary phosphonium salts are shown to have improved performance with respect to the amount of volatile dihydroxy aromatic compound actually incorporated into the product copolycarbonate.
    • 提出了熔融聚合方法,其可以有效地制备其中一种或多种所用的组分脱羟基芳族化合物相对挥发的共聚碳酸酯,其沸点低于约340℃。 相对挥发性的二羟基芳族化合物由二羟基苯如氢醌,甲基氢醌和间苯二酚表示。 用于制备这种类型的共聚碳酸酯的成员的已知方法,例如双酚A和间苯二酚碳酸二苯酯在氢氧化钠和四烷基铵盐催化剂体系的存在下的熔融反应,由于间苯二酚被夹带在 聚合混合物与副产物苯酚。 显示出包含季鏻盐的催化剂体系相对于实际掺入到产物共聚碳酸酯中的挥发性二羟基芳族化合物的量具有改进的性能。