发明名称 |
Low density, modified polyimide foams and methods of making same |
摘要 |
Methods of making low density modified polyimide/polyimide-amide foams and the resulting compositions. An N-substituted aliphatic imide is prepared by reacting a suitable aromatic dianhydride with a suitable oxime. A polyimide forming material is prepared by dissolving the N-substituted aliphatic imide in an esterifying solvent, then adding a suitable aromatic diamine. This material is dried to a powder. A suitable hydrated compound which is stable up to at least about 100 DEG C. is mixed with the powder. A foam is then produced by heating the material to reaction temperature for a period sufficient to produce a stable foam. The material melts, then spontaneously expands into a foam which becomes self supporting and cures to a resilient flexible foam. The addition of the hydrated compound is found to result in an exceptionally low density foam. Depending upon heating conditions, a polyimide, polyimide-amide or mixture thereof may be produced, resulting in foams having selectively variable physical properties.
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申请公布号 |
US4621015(A) |
申请公布日期 |
1986.11.04 |
申请号 |
US19840587020 |
申请日期 |
1984.03.07 |
申请人 |
LONG, JOHN V.;GAGLIANI, JOHN |
发明人 |
LONG, JOHN V.;GAGLIANI, JOHN |
分类号 |
C08G73/10;C08J9/02;C08J9/34;C08L79/08;(IPC1-7):C08J9/00;C08J9/12;B32B5/18;B32B5/20 |
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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