Polyimide foams and methods of making same

Details Polyimide foams and methods of making same Polyimide foams and methods of making same

1986-07-07

1987-04-07

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

264 53, 521 60, 521184, 521185, 521189, 521 58, C08J 922, C08J 924

Patent

active

046561986

ABSTRACT:
A high temperature, flame resistant polyimide foam material and methods of making open and closed cell, rigid and flexible foams from common precursors. An aromatic tetracarboxylic dianhydride is reacted with an amino acid and an alcohol or mixture of alcohols to produce an N-substituted imido acid ester. The product is then reacted with an aromatic diamine. The resulting liquid is dried, ground to a course powder, ad classified into sizes from 0.25 mm to 2 mm by sieving. The powder is suitable for foaming without further modificaiton, by exapansion at 100 to 3000 in a closed mold to form a well consolidated, uniform, mostly closed cell product. When expanded unrestrictedly, open cell flexible or rigid consolidated foams are produced, depending on choice of alcohol(s). The foams have excellent resistance to heat and flame, and bond well to glass prepreg to form rigid structures.

REFERENCES:
patent: 4439381 (1984-03-01), Gagliami et al.
patent: 4476254 (1984-10-01), Long et al.
patent: 4518717 (1985-05-01), Long et al.
patent: 4539336 (1985-09-01), Long et al.
patent: 4546115 (1985-10-01), Gagliani et al.
patent: 4562112 (1985-12-01), Lee et al.

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