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    • 91. 发明授权
    • Preparation of polycarbonate having a predetermined molecular weight and level of endcapping
    • 具有预定分子量和封端水平的聚碳酸酯的制备
    • US06399739B1
    • 2002-06-04
    • US09934929
    • 2001-08-22
    • Patrick Joseph McCloskeyAlberto NisoliWarren William Reilly
    • Patrick Joseph McCloskeyAlberto NisoliWarren William Reilly
    • C08G6400
    • C08G64/307
    • A melt method of preparing polycarbonate having a predetermined number average molecular weight and percent endcapping is described. A computerized process model is used to determine the reaction parameters to be employed in order to furnish the product polycarbonate possessing the desired Mn and %EC. Reaction parameters of importance include a suitable starting molar ratio of diaryl carbonate to dihydroxy aromatic compound, the most appropriate reaction time, reaction temperature and pressure ranges. The target polycarbonate is then prepared using reaction parameters indicated by the process model in a reactor which forms an element of the process model. Characteristics of the reactor which may be included in the process model include agitation rate and reflux ratio during the distillative removal of hydroxy aromatic compound formed as a by-product during the polymerization.
    • 描述了制备具有预定数均分子量和百分比封端的聚碳酸酯的熔融方法。 使用计算机化过程模型来确定要使用的反应参数,以便提供具有期望的Mn和%EC的产物聚碳酸酯。 重要的反应参数包括碳酸二芳基酯与二羟基芳族化合物的合适起始摩尔比,最合适的反应时间,反应温度和压力范围。 然后使用形成过程模型元素的反应器中由过程模型指示的反应参数制备目标聚碳酸酯。 可以包括在过程模型中的反应器的特征包括在蒸馏除去在聚合期间作为副产物形成的羟基芳族化合物的搅拌速率和回流比。
    • 93. 发明授权
    • Melt polycarbonate catalyst systems
    • 熔融聚碳酸酯催化剂体系
    • US06323304B1
    • 2001-11-27
    • US09760086
    • 2001-01-12
    • John Patrick LemmonPatrick Joseph McCloskeyOltea Puica Siclovan
    • John Patrick LemmonPatrick Joseph McCloskeyOltea Puica Siclovan
    • C08G6378
    • C08G64/307
    • This invention provides a method for preparing polycarbonates, which utilizes polycondensation catalysts of the formula Ax+MF6−x, wherein A is an alkali metal or alkaline earth cation; M is a transition metal of group IVA or VA, or M is a p-block metal of group IIIB, IVB or VB; and x is 1, 2, or 3. We have found that this new class of catalysts provide excellent polymerization rates for the preparation of Bisphenol A polycarbonate from the melt polymerization of diphenyl carbonate and Bisphenol A. Moreover, the catalysts of the invention were found to be very selective in substantially reducing the level of branching side reaction, i.e., formation of Fries product, normally associated with the melt polycarbonate process.
    • 本发明提供一种制备聚碳酸酯的方法,其使用式Ax + MF6-x的缩聚催化剂,其中A为碱金属或碱土金属阳离子; M是IVA或VA族的过渡金属,或M是IIIB,IVB或VB族的p型金属; 我们已经发现,这种新型催化剂从碳酸二苯酯和双酚A的熔融聚合制备双酚A聚碳酸酯提供了极好的聚合速率。此外,发现了本发明的催化剂 在大大降低支化反应的水平方面非常有选择性,即通常与熔融聚碳酸酯方法相关的Fries产物的形成。