Polyimide foams

Details Polyimide foams Polyimide foams

1981-12-07

1982-11-23

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

20415911, 521184, 521185, 523137, 524424, 528188, 528226, 528229, C08G 6932

Patent

active

043606040

ABSTRACT:
Copolyimide foams derived from a diester of 3,3',4,4'-benzophenonetetracarboxylic acid, an aromatic diamine, and a heterocyclic diamine. A molar concentration of the heterocyclic diamine approaching but not exceeding 0.42 is employed. This results in a flexible foam with a homogeneous cellular structure and a reduced compression set loss.

REFERENCES:
patent: Re30213 (1980-02-01), Gagliani et al.
patent: 3726834 (1973-04-01), Acle, Jr.
patent: 4070312 (1978-01-01), Gagliani et al.
patent: 4241193 (1980-12-01), Gagliani
patent: 4299787 (1981-10-01), Gagliani

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