申请人:General Electric Company
公开号:US20030088051A1
公开(公告)日:2003-05-08
A process for preparing an end-capped polycarbonate comprises melt reacting an aromatic dihydroxy compound, a carbonic acid diester, and optionally a catalyst in a prepolymerization vessel to form a polycarbonate product; transferring the polycarbonate product from the prepolymerization vessel; mixing the polycarbonate product with an end-capping agent under hermetic seal at a pressure of at least about 760 mm Hg; and transferring the polycarbonate product and end-capping agent mixture to a postpolymerization vessel to endcap the polycarbonate product. An apparatus for preparing an end-capped polycarbonate comprises a prepolymerization vessel having and inlet and an outlet; a postpolymerization vessel having an inlet and an outlet; a mixer in fluid communication with the outlet of the prepolymerization vessel and the inlet of the postpolymerization vessel; and a charging port through which an end-capping agent is charged to the mixer, wherein the mixer is hermetically sealed at greater than or equal to 760 mm Hg.
一种制备封端聚碳酸酯的工艺包括:在预聚合容器中熔融反应芳香族二羟基化合物、碳酸二酯和催化剂,形成聚碳酸酯产品;将聚碳酸酯产品从预聚合容器中转移出来;在至少约 760 毫米汞柱的压力下,在密封条件下将聚碳酸酯产品与封端剂混合;以及将聚碳酸酯产品和封端剂混合物转移到后聚合容器中,对聚碳酸酯产品进行封端。一种用于制备端盖聚碳酸酯的设备包括:一个具有入口和出口的预聚合容器;一个具有入口和出口的后聚合容器;一个与预聚合容器的出口和后聚合容器的入口流体相通的混合器;以及一个将端盖剂装入混合器的装料口,其中混合器在大于或等于 760 毫米汞柱的压力下密封。