发明名称 |
Production method of polycarbonate |
摘要 |
A method of producing a polycarbonate excellent in the hue, the thermal stability, and the electrolysis stability by supplying a polycarbonate obtained by a transesterification method to an extruder having vent(s), melting the polycarbonate, and adding an acidic compound to the molten polycarbonate followed by kneading to continuously devolatilize low molecular weight compounds remaining in the polycarbonate. Better result is obtained by adding water to the kneaded mixture of the polycarbonate and the acidic compound before devolatilizing the low molecular weight compounds.
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申请公布号 |
US5777064(A) |
申请公布日期 |
1998.07.07 |
申请号 |
US19960615466 |
申请日期 |
1996.03.14 |
申请人 |
MITSUBISHI GAS CHEMICAL COMPANY, INC. |
发明人 |
HAYASHI, KATSUSHIGE;KAWAKAMI, TSUTOMU;TAKEDA, YUJI;IURA, KATUHIRO |
分类号 |
B29C47/76;B29C67/24;C08G64/40;(IPC1-7):C08G64/00 |
主分类号 |
B29C47/76 |
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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