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

1983-04-15

1984-01-17

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521183, 521184, 521185, 521189, 528184, 528322, 528323, 528328, C08J 922, C08J 924, C08J 932

Patent

active

044264631

ABSTRACT:
Methods of making modified polyimide/polyimide-amide foams having selected compressive resistance and density characteristics and the resulting compositions. An N-substituted aliphatic imide is prepared by reacting a suitable aromatic dianhydride with a suitable oxoimine. Within the mole ratio range of oxoimine to dianhydride of about 0.5:1 to about 0.05:1 the compressive resistance of the final foam can be selected in accordance with the intended end use of the foam. Density and compressive resistance varies inversely with the oxoimine quantity in the ratio, being greatest with the 0.5:1 ratio and lowest with the 0.05:1 ratio. 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 mateial 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.

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