发明授权
- 专利标题： Polyimide compositions and processes
- 专利标题（中）： 聚酰亚胺组合物和方法
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申请号： US456512申请日： 1989-12-26
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公开(公告)号： US4944902A公开(公告)日： 1990-07-31
- 发明人: Carroll W. Lanier , Raymond Lee
- 申请人： Carroll W. Lanier , Raymond Lee
- 申请人地址： VA Richmond
- 专利权人： Ethyl Corporation
- 当前专利权人： Ethyl Corporation
- 当前专利权人地址： VA Richmond
- 主分类号： C08G73/10
- IPC分类号： C08G73/10 ; C08J9/02
摘要：
A copolyimide foam comprising the reaction product of one or more of an aromatic tetracarboxylic acid and a compound of the formula: ##STR1## where x is an integer from 1 to 12 and R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are the same or different and are hydrogen or C.sub.1 to C.sub.6 linear or branched alkyl a mixture thereof with two or more diamines at least one of which being a heterocyclic diamine having a nitrogen atom in the ring and the other being a para- or meta-substituted aromatic diamine free of aliphatic substitution.Processes for producing the above copolyimide foam are also disclosed.
公开/授权文献
- US4440667A Catalyst regeneration in a catalytic reforming process 公开/授权日：1984-04-03
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