Modified polyimide/polyimide-amide foams and methods of making s

Details Modified polyimide/polyimide-amide foams and methods of making s Modified polyimide/polyimide-amide foams and methods of making s

1984-12-06

1985-09-03

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521117, 521185, 521189, C08J 902

Patent

active

045393362

ABSTRACT:
Methods of making modified polyimide/polyimide-amide foams having selected compressive resistance and density characteristics and the resulting compositions. A suitable aromatic dianhydride is mixed with a suitable oxoimine and alcohol, which initially is believed to form a monoimide which is substantially/simultaneously esterified by the alcohol. To this mixture is added a suitable diamine to produce a polyimide forming material. 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. Within the mole ratio range of oxoimine to dianhydride of about 1.5:1 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 0.05:1 ratio and lowest with the 1.5:1 ratio.

REFERENCES:
patent: 4394464 (1983-07-01), Gagliani et al.
patent: 4425441 (1984-01-01), Gagliani et al.
patent: 4426463 (1984-01-01), Gagliani et al.

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