发明名称 |
Process for preparing polyimide solution |
摘要 |
A polyimide solution is prepared by a process wherein a tetracarboxylic acid ingredient containing at least about 80% by mole of 3,3',4,4'-biphenyltetracarboxylic acid or its functional derivative and an aromatic diamine ingredient containing at least about 50% by mole of 4,4'-diaminodiphenyl ether are polymerized at from about 100 DEG to 300 DEG C. in phenol or a halogenated phenolic compound; the amount of the acid and diamine ingredients being approximately equimolar to each other; whereby polymerization of the tetracarboxylic acid ingredient and the aromatic diamine ingredient is effected while being accompanied by imidation. Preferably, the polymerization accompanied by imidation is effected in a manner such that at least a second half of the polymerization is carried out in a closed reaction system. The resulting polyimide solution is suitable for making therefrom shaped articles, such as films, possessing excellent mechanical properties.
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申请公布号 |
US4290936(A) |
申请公布日期 |
1981.09.22 |
申请号 |
US19790092508 |
申请日期 |
1979.11.08 |
申请人 |
UBE INDUSTRIES, LTD. |
发明人 |
SASAKI, YOSHIKAZU;INOUE, HIROSHI;SASAKI, ICHIRO;ITATANI, HIROSHI;KASHIMA, MIKITO |
分类号 |
C08G73/10;(IPC1-7):C08K5/13 |
主分类号 |
C08G73/10 |
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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