发明名称 |
PROCESS FOR THE PRODUCTION OF BRANCHED MELT POLYCARBONATE BY LATE ADDITION OF FRIES-INDUCING CATALYST |
摘要 |
The invention relates to a method for the production of a branched polycarbonate composition, having increased melt strength, by late addition of branch-inducing catalysts to the polycarbonate oligomer in a melt polycondensation process. Surprisingly, it has been found that by adding branch-inducing catalysts, such as alkali metal compounds and/ or alkaline earth metal compounds, to the melt polycarbonate oligomer at a later stage of the melt polycondensation process, preferably after the oligomer has reached an average molecular weight of between about 3,000 and 30,000 g/mole, a unique branched polycarbonate composition is formed that has improved properties. It is believed that the addition of the branch-inducing catalysts at the later stages of the process produces a branched polycarbonate composition having longer chains between the branching points, and thus a new composition is produced. The invention also relates to various applications of the branched polycarbonate composition.
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申请公布号 |
WO03057758(A1) |
申请公布日期 |
2003.07.17 |
申请号 |
WO2002US36370 |
申请日期 |
2002.11.12 |
申请人 |
GENERAL ELECTRIC COMPANY |
发明人 |
KARLIK, DENNIS;BRACK, HANS, PETER;VERHOOGT, HENDRIK;LEMMON, JOHN, PATRICK;KAMPS, JAN, HENK;SEDEREL, WILLEM, LODEWIJK;GOOSSENS, JOHANNES, MARTINUS, DINA |
分类号 |
C08J5/00;C08G64/20;C08G64/30;(IPC1-7):C08G64/30 |
主分类号 |
C08J5/00 |
代理机构 |
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