发明名称 |
Process for preparing polycarbonate and apparatus for preparing polycarbonate |
摘要 |
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.
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申请公布号 |
US6620902(B2) |
申请公布日期 |
2003.09.16 |
申请号 |
US20020063282 |
申请日期 |
2002.04.08 |
申请人 |
GENERAL ELECTRIC COMPANY |
发明人 |
SHIMODA TOMOAKI;IKEDA AKIO;KIMURA TAKATO;TAMADA KEN;BRACK HANS-PETER;KARLIK DENNIS;PRADA LINA;ZIRKZEE HENDRICUS FRANCISCUS;CELLA JAMES ANTHONY |
分类号 |
C08G64/42;C08G64/00;C08G64/14;C08G64/20;C08G64/30;(IPC1-7):C08G64/00 |
主分类号 |
C08G64/42 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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