发明名称 |
Method for controlling the effective level of catalyst during the preparation of a polycarbonate polymer by transesterification |
摘要 |
A method for determining the effective level of catalyst for the preparation of a polycarbonate polymer by a transesterification reaction is disclosed. The method involves measurement of the leaving group by-product (usually phenol) produced in a test reaction between an aromatic dihydroxy compound and a carbonic acid diester, in the presence of a known amount of transesterification catalyst. The by-product production values can be compared with by-product reference values to calculate the effective level of catalyst. This data can be used to efficiently control catalytic activity in a production scale reaction for producing polycarbonate polymer.
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申请公布号 |
US5886132(A) |
申请公布日期 |
1999.03.23 |
申请号 |
US19960777726 |
申请日期 |
1996.12.20 |
申请人 |
GENERAL ELECTRIC COMPANY |
发明人 |
VARADARAJAN, GODAVARTHI SATYANARAYANA;SHIMODA, TOMOAKI;KANEZAWA, AKIO;MINAMI, SATORU |
分类号 |
C08G64/30;(IPC1-7):C08G64/00 |
主分类号 |
C08G64/30 |
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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