Development of polyimide foams with blowing agents

Details Development of polyimide foams with blowing agents Development of polyimide foams with blowing agents

1982-12-03

1985-03-19

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521 90, 521114, 521121, 521185, 521189, C08J 910

Patent

active

045060380

ABSTRACT:
A method of preparing a polyimide foam which includes the steps of: preparing, foaming, and curing a precursor containing at least one alkyl ester of 3,3'4,4'-benzophenonetetracarboxylic acid; a meta- or para-substituted aromatic diamine; a heterocyclic diamine; an aliphatic diamine; and a solid blowing agent. The blowing agent is added to said precursor in a concentration which is sufficient to effect at least one of the following attributes of the foam: cell size, proportion of open cells, cell density, and indentation load deflection.

REFERENCES:
patent: 3249561 (1966-05-01), Hendrix
patent: 3310506 (1967-03-01), Amborski et al.
patent: 3349061 (1967-10-01), Pruckmayr
patent: 3705118 (1972-12-01), Abolafia et al.
patent: 3966652 (1976-06-01), Gagliani et al.
patent: 4315076 (1982-02-01), Gagliani et al.

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