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    • 51. 发明授权
    • Polycarbonates and method of preparing same
    • 聚碳酸酯及其制备方法
    • US07482423B2
    • 2009-01-27
    • US11427861
    • 2006-06-30
    • Bernd JansenJan Henk KampsEdward KungPatrick Joseph McCloskeyPaul Michael Smigelski, Jr.
    • Bernd JansenJan Henk KampsEdward KungPatrick Joseph McCloskeyPaul Michael Smigelski, Jr.
    • C08G64/00C08G63/02
    • C08G64/307C08G64/04
    • Polycarbonates incorporating terminal carbonate groups derived from ester-substituted activated carbonates, for example terminal methyl salicyl carbonate (TMSC) derived from the use of BMSC as the activated carbonate in a transesterification process, have unfavorable properties with respect to color, hydrolytic stability and thermal stability, particularly when the polycarbonate containing such end groups is molded. The number of activated carbonate end groups formed during the melt transesterification formation of polycarbonate can be reduced, however, without sacrificing the benefits of using an activated diaryl carbonate, and without requiring a separate reaction or additional additives by reacting a dihydroxy compound with an activated diaryl carbonate in the presence of an esterification catalyst to produce a polycarbonate, wherein the molar ratio of activated diaryl carbonate to dihydroxy compound is less than 1 when expressed to at least three decimal places, for example 0.996 or less.
    • 由酯取代的活性碳酸酯衍生的末端碳酸酯基团的聚碳酸酯,例如在酯交换法中使用BMSC作为活性碳酸酯的末端甲基水杨酸碳酸酯(TMSC)在颜色,水解稳定性和热稳定性方面具有不利的性质 特别是当含有这种端基的聚碳酸酯被模制时。 然而,在聚碳酸酯的熔融酯交换形成期间形成的活化碳酸酯端基的数量可以降低,但不会牺牲使用活性碳酸二芳基酯的优点,并且不需要单独的反应或另外的添加剂,通过使二羟基化合物与活化的二芳基 在酯化催化剂存在下制备碳酸酯以制备聚碳酸酯,其中活化的碳酸二芳酯与二羟基化合物的摩尔比当表示至少三位小数,例如0.996或更小时小于1。
    • 54. 发明授权
    • Method for making polycarbonate
    • 制作聚碳酸酯的方法
    • US06569985B2
    • 2003-05-27
    • US09924137
    • 2001-08-08
    • Patrick Joseph McCloskeyAlberto NisoliWarren William Reilly
    • Patrick Joseph McCloskeyAlberto NisoliWarren William Reilly
    • C08G6400
    • C08G64/307
    • Polycarbonates having a high level of endcapping and containing a low level of Fries rearrangement product are prepared from dihydroxy aromatic compounds, such as bisphenol A, and diaryl carbonates such as diphenyl carbonate in a two stage process involving a tetraalkyl phosphonium carboxylate catalyzed oligomerization of the reactants in a first reaction stage followed by the addition of an alkali metal hydroxide co-catalyst in the second stage of the polymerization reaction. The late addition of the co-catalyst provides improved polymerization reaction rates as judged by higher polycarbonate molecular weights. The amount of alkali metal hydroxide co-catalyst is small thus avoiding the formation of excessive amounts of Fries product. The method has been used to provide Fries product levels between 200 and 800 parts per million in polycarbonates having Mn values between 7,500 and 8,500 Daltons.
    • 具有高水平的封端并含有低含量的Fries重排产物的聚碳酸酯由二羟基芳族化合物如双酚A和碳酸二芳基酯如碳酸二苯酯在涉及四烷基鏻羧酸酯催化的反应物低聚的两步法中制备 在第一反应阶段,然后在聚合反应的第二阶段加入碱金属氢氧化物助催化剂。 通过较高的聚碳酸酯分子量判断,辅助催化剂的晚期添加提供了改进的聚合反应速率。 碱金属氢氧化物助催化剂的量很小,从而避免形成过量的油炸产品。 该方法已经被用于在Mn值在7,500和8,500道尔顿之间的聚碳酸酯中提供200至800ppm之间的Fries产品水平。