发明名称 |
Production and use of polyester carbonates |
摘要 |
A transesterification process for producing polyester is disclosed. In a first stage of the process there is heated, in an inert gas atmosphere, a first mixture containing at least one dihydroxy compound and at least one diaryl carbonate to form an oligocondensate. In a second stage there is added to the oligocondensate at least one dicarboxylic acid to form a second mixture. The second mixture is heated to a temperature not higher than 290° C. in the presence of a quaternary onium compound as catalyst to form polyester carbonate. Hydroxyaryl formed throughout the process is distilled-off under reduced pressure.
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申请公布号 |
US2003105272(A1) |
申请公布日期 |
2003.06.05 |
申请号 |
US20020180351 |
申请日期 |
2002.06.26 |
申请人 |
KRATSCHMER SILKE;BUNZEL LOTHAR;ALEWELT WOLFGANG;WILMS RENATE |
发明人 |
KRATSCHMER SILKE;BUNZEL LOTHAR;ALEWELT WOLFGANG;WILMS RENATE |
分类号 |
C08J5/00;C08G63/64;(IPC1-7):C08G64/00 |
主分类号 |
C08J5/00 |
代理机构 |
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