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    • 1. 发明授权
    • Extrusion method for making polycarbonate
    • 制造聚碳酸酯的挤出方法
    • US06420512B1
    • 2002-07-16
    • US09911439
    • 2001-07-24
    • Patrick Joseph McCloskeyJames DayPaul Michael SmigelskiJohn Lester MaxamJohn Aibangbee Osaheni
    • Patrick Joseph McCloskeyJames DayPaul Michael SmigelskiJohn Lester MaxamJohn Aibangbee Osaheni
    • C08G6400
    • C08G64/307
    • Extrusion of a mixture of an ester-substituted diaryl carbonate, such as bis-methyl salicyl carbonate, a dihydroxy aromatic compound such as bisphenol A and a transesterification catalyst such as tetrabutyl phosphonium acetate (TBPA) affords polycarbonate having a weight average molecular weight of greater than 20,000 Daltons. The extruder is equipped with one or more vacuum vents to remove by-product ester-substituted phenol. Similarly, a precursor polycarbonate having ester-substituted phenoxy endgroups, for example methyl salicyl endgroups, when subjected to extrusion affords a polycarbonate having a significantly increased molecular weight relative to the precursor polycarbonate. The reaction to form a higher molecular weight polycarbonate may be catalyzed by residual transesterification catalyst present in the precursor polycarbonate, or by a combination of any residual catalyst and an additional catalyst such as TBPA introduced in the extrusion step. Fries rearrangement products are not observed in the product polycarbonates.
    • 酯取代的碳酸二芳基酯如碳酸双甲酯,双酚A等二羟基芳族化合物和乙酸四丁基鏻(TBPA)等酯交换催化剂的混合物的挤出,得到重均分子量大的聚碳酸酯 超过20,000道尔顿。 挤出机配备有一个或多个真空通风口以除去副产物酯取代的苯酚。 类似地,具有酯取代的苯氧基端基的前体聚碳酸酯,例如甲基水杨基端基,当进行挤出时,得到相对于前体聚碳酸酯具有显着增加的分子量的聚碳酸酯。 形成较高分子量聚碳酸酯的反应可以通过存在于前体聚碳酸酯中的残留酯交换催化剂,或者通过任何残余催化剂和另外的催化剂如在挤出步骤中引入的TBPA的组合来催化。 在产品聚碳酸酯中没有观察到薯条重排产物。
    • 4. 发明申请
    • Polycarbonates and method of preparing same
    • 聚碳酸酯及其制备方法
    • US20080004417A1
    • 2008-01-03
    • US11427861
    • 2006-06-30
    • Bernd JansenJan Henk KampsEdward KungPatrick Joseph McCloskeyPaul Michael Smigelski
    • Bernd JansenJan Henk KampsEdward KungPatrick Joseph McCloskeyPaul Michael Smigelski
    • C08G64/00
    • 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。
    • 5. 发明申请
    • Method of Preparing Polycarbonate
    • 聚碳酸酯的制备方法
    • US20080004418A1
    • 2008-01-03
    • US11427885
    • 2006-06-30
    • Bernd JansenJan Henk KampsEdward KungPatrick Joseph McCloskeyPaul Michael Smigelski
    • Bernd JansenJan Henk KampsEdward KungPatrick Joseph McCloskeyPaul Michael Smigelski
    • C08G64/00
    • C08G64/14C08G64/307
    • Polycarbonates incorporating terminal carbonate groups derived from ester-substituted activated carbonates 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 by reacting a dihydroxy compound with an activated diaryl carbonate in the presence of an esterification catalyst to produce a polycarbonate, in the presence of a monohydroxy chainstopper such as para-cumyl phenol in an amount that results in 35 to 65 mol % of the end groups being derived from the monohydroxy chainstopper. Suitably, the reactants are provided such that the molar ratio of activated diaryl carbonate to the total of dihydroxy compound plus ½ the chainstopping reagent that is less than 1.
    • 在酯交换方法中,衍生自酯取代的活性碳酸酯的末端碳酸酯基团的聚碳酸酯在颜色,水解稳定性和热稳定性方面具有不利的性质,特别是当含有这样的端基的聚碳酸酯被成型时。 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通过在酯化催化剂的存在下使二羟基化合物与活化的碳酸二芳基酯反应来制备聚碳酸酯,在单羟基链断裂剂例如对 - 辛基苯酚,其量导致35-65mol%端基衍生自单羟基链断裂剂。 适当地,提供反应物使得活化的碳酸二芳基酯与二羟基化合物的总和加上1/2的阻滞剂的摩尔比小于1。