Production of polyimide foams

Details Production of polyimide foams Production of polyimide foams

1988-12-30

1990-02-13

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521183, 521185, 521189, C08V 902

Patent

active

049007610

ABSTRACT:
A polyimide precursor mixture having a solids content of about 50 to about 77 (preferably about 65 to about 75) weight percent is subjected to a multistaged thermal treatment in which the precursor is heated to one or more temperatures sufficient to obtain a consolidated but friable cellular foam structure, and the resultant cellular foam structure is then subjected to one or more higher temperatures sufficient to cure the cellular material into a resilient polyimide foam. There is no need for use of time-consuming and expensive spray drying and microwave radiation apparatus.

REFERENCES:
patent: Re30213 (1980-02-01), Gagliami et al.
patent: 4241193 (1980-12-01), Gagliami
patent: 4394464 (1983-07-01), Gogliam et al.
patent: 4518717 (1985-05-01), Long et al.

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