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    • 9. 发明授权
    • Method for preparation of polycarbonates
    • 聚碳酸酯的制备方法
    • US06277946B1
    • 2001-08-21
    • US09567826
    • 2000-05-09
    • Johannes Jacobus van HeijkantChristopher PoirierTomoaki ShimodaAkio KanezawaCarlos Godinez Seoane
    • Johannes Jacobus van HeijkantChristopher PoirierTomoaki ShimodaAkio KanezawaCarlos Godinez Seoane
    • C08G6400
    • C08G64/307G11B7/253
    • A method is provided for the preparation of polycarbonates by the reaction of a diaryl carbonate, such as DPC and a dihydric phenol, such as BPA. The method utilizes the steps of successively processing the diaryl carbonate and the dihydric phenol in a melt in a first reaction stage, a second reaction stage and at least a first polymerization stage, and shifts the processing conditions such that the desired low viscosity/high end-cap product is obtained. This is achieved by having the ratio of diaryl carbonate to dihydric phenol in the melt prior to the first reaction stage greater than 1.08; and by controlling the temperature and residence time in the first polymerization stage to provide a polycarbonate product having a melt flow rate at 250° C. of greater than 10 g/min and an end-cap level of at least 90%. The method of the invention can be used in a linear manufacturing process, in which there is one product produced. The method of the invention can also be incorporated into a multi-line manufacturing process for the simultaneous production of more than one product. Thus, a stream of product produced from the first polymerization stage may be split into two or more lines which are further processed to produce, for example, a low viscosity, high end-cap product and a medium viscosity, moderate end-cap product.
    • 提供了通过碳酸二芳基酯如DPC和二元酚如BPA的反应来制备聚碳酸酯的方法。 该方法采用在第一反应阶段,第二反应阶段和至少第一聚合阶段中在熔体中连续加工碳酸二芳基酯和二元酚的步骤,并使加工条件转变为所需的低粘度/高端 -cap产品。 这通过在第一反应阶段之前使熔体中的碳酸二芳基酯与二元酚的比率大于1.08来实现; 并且通过控制在第一聚合阶段中的温度和停留时间被选择以提供熔体流动速率在250℃下大于10g / 10分钟且端帽水平至少为90%的聚碳酸酯产品。 本发明的方法可以用于生产一种产品的线性制造过程中。 本发明的方法还可以并入用于同时生产多于一种产品的多线制造工艺中。 因此,从第一聚合阶段生产的产品流可以分成两行或更多行,其进一步加工以产生例如低粘度,高端帽产品和中等粘度的适中的端帽产品。