| 发明名称 |
PROCESS FOR THE PREPARATION OF SEMIORDERED POLYAMIDES-IMIDES |
| 摘要 |
The present invention relates to a process for obtaining semiordered polyamides-imides. More particularly it consists in performing the polycondensation in two separate stages: 1) reaction between a part of an aromatic diisocyanate and all of the trimellitic anhydride in the presence of dimethylalkyleneurea of pH</=7 until the intermediate compound has dissolved, 2) successive addition of one or more aromatic diacids and of the remainder of the diisocyanate in the dimethylalkyleneurea of pH</=7 until the polyamide-imide obtained has dissolved completely. The semiordered polymers thus obtained have a Tg lower than the random polymers, and this makes them easier to convert.
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| 申请公布号 |
US5118778(A) |
申请公布日期 |
1992.06.02 |
| 申请号 |
US19910698076 |
申请日期 |
1991.05.10 |
| 申请人 |
RHONE POULENC FIBRES |
发明人 |
LAMBLA, MORAND;MICHAUD, PHILIPPE;RUSSO, JEAN |
| 分类号 |
C08G18/08;C08G18/34;C08G73/14 |
主分类号 |
C08G18/08 |
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