Ambient cure polyimide foam

Details Ambient cure polyimide foam Ambient cure polyimide foam

1980-02-19

1981-04-21

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521157, 528 49, 528 51, 528 73, C08G 1814

Patent

active

042634105

ABSTRACT:
A polyimide foam is provided which has improved resistance to crumbling and to high temperatures. The foam is produced by reacting polymethylene polyphenylisocyanate (PAPI) with benzophenone-3,3',4,4'-tetracarboxylic acid dianhydride (BTDA) in the presence of furfuryl alcohol and concentrated phosphoric acid (PA). The ratio of PA to PAPI, (PA/PAPI), must be approximately 20 to 26% by weight.

REFERENCES:
patent: 3772216 (1973-11-01), Rosser
patent: 4184021 (1980-01-01), Frosch et al.

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