发明名称 |
METHOD FOR MAKING POLYCARBONATE |
摘要 |
A method of making polycarbonate comprises melt-polymerizing an aromatic dihydroxy compound and a carbonic acid diester in a presence of a polymerization catalyst in a reactor system producing a byproduct stream, wherein the polymerization catalyst comprises a quaternary phosphonium compound; and purifying the byproduct stream to separate the carbonic acid diester, wherein the separated carbonic acid diester has a phosphorous concentration of less than or equal to about 30 parts per million.
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申请公布号 |
KR20070089923(A) |
申请公布日期 |
2007.09.04 |
申请号 |
KR20077012320 |
申请日期 |
2007.05.31 |
申请人 |
GENERAL ELECTRIC COMPANY |
发明人 |
HIDALGO GERARDO;MCCLOSKEY PATRICK J.;NISOLI ALBERTO;PRADA LINA |
分类号 |
C08G64/20;C08G64/00;C08G64/30 |
主分类号 |
C08G64/20 |
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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