Closed cell polyimides

Details Closed cell polyimides Closed cell polyimides

1981-03-30

1982-03-09

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521 77, 521185, 528229, 528353, C08G 1212, C08V 900

Patent

active

043190006

ABSTRACT:
Closed cell polyimide foams. Methods of making such foams from precursors derived from a benzophenonetetracarboxylic acid diester and a mixture of diamines in which the precursor is molded to shape and cured, hydrated, and heated until a porous, closed cell structure develops.

REFERENCES:
patent: 3249561 (1966-05-01), Hendrix
patent: 3506583 (1970-04-01), Boram et al.
patent: 3700649 (1972-10-01), Boram et al.
patent: 3726834 (1973-04-01), Acle, Jr.
patent: 3793281 (1974-02-01), Acle, Jr.
patent: 3966652 (1976-06-01), Gagliani et al.
patent: 4153783 (1979-05-01), Gagliani et al.

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