Modified polyimide foams and methods of making same

Details Modified polyimide foams and methods of making same Modified polyimide foams and methods of making same

1983-12-27

1984-12-04

Foelak, Morton

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

521180, 521183, 521184, 521185, 521189, 528184, 528322, 528323, 528328, C08J 922, C08J 924

Patent

active

RE0317560

ABSTRACT:
Methods of making 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 oxoimine. 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 or film. A foam is 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. Depending upon heating conditions, a polyimide, polyimide-amide or mixture thereof may be produced, resulting in foams having varying physical properties.

REFERENCES:
patent: 4335120 (1982-10-01), Gagliani et al.
patent: 4360604 (1982-11-01), Gagliani et al.
patent: 4361453 (1982-11-01), Gagliani et al.
patent: 4394464 (1983-07-01), Gagliani et al.

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