发明名称 |
Method of polycarbonate preparation |
摘要 |
Mixed alkali metal salts of phosphoric acid in combination with a co-catalyst such as tetramethylammonium hydroxide (TMAH) are excellent transesterification catalysts for use in the preparation of polycarbonate from bisphenol A and diphenyl carbonate. The mixed alkali metal phosphate salts were shown by kinetic measurements made on a model system composed of p-tert-octylphenol and bis(p-cumylphenyl) carbonate to be inherently more potent catalysts than salts of phosphoric acid comprising a single alkali metal ion. In addition to providing higher rates of polymerization, the new catalysts were shown to provide polycarbonates containing reduced levels of Fries rearrangement product relative to polymerization reactions catalyzed by conventional catalyst systems such as sodium hydroxide together with TMAH co-catalyst.
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申请公布号 |
US6723823(B2) |
申请公布日期 |
2004.04.20 |
申请号 |
US20020167965 |
申请日期 |
2002.06.12 |
申请人 |
GENERAL ELECTRIC COMPANY |
发明人 |
MCCLOSKEY PATRICK JOSEPH;REILLY WARREN WILLIAM;GRIMMOND BRIAN JAMES |
分类号 |
C08G64/30;(IPC1-7):C08G6/00 |
主分类号 |
C08G64/30 |
代理机构 |
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代理人 |
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地址 |
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