Method of impregnating reticulated foam with polymide foam and p

Details Method of impregnating reticulated foam with polymide foam and p Method of impregnating reticulated foam with polymide foam and p

1991-05-20

1992-08-04

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521 52, 521134, 521137, 521139, 521184, 521185, 264 51, C08J 938, C08J 940

Patent

active

051359596

ABSTRACT:
A method of forming complex polyimide foam shapes by impregnating a low density, open cell, reticulated form with polymide foam precursor, placing the combination in a mold, closing the mold, then heating the assembly to the foaming and curing temperatures of the precursor. As the powdered precursor expands, it spreads throughout the reticulated foam producing a product having substantially uniform density and polyimide foam characteristics. If desired, the reticulated foam can be removed from the product by using a material that outgasses and boils away at polyimide processing temperatures. Radar absorbing materials may be incorporated in the reticulated foam so that the final product will have uniformly distributed radar absorbing components with the desirable high temperature resistance and other properties of polyimide foams.

REFERENCES:
patent: 3644168 (1972-02-01), Bonk et al.
patent: 3897395 (1975-07-01), D'Alelio
patent: 4026833 (1977-05-01), D'Alelio
patent: 4830883 (1989-05-01), Lee
patent: 4923651 (1990-05-01), Hill
patent: 4966919 (1990-10-01), Williams, Jr. et al.
patent: 4980004 (1990-12-01), Hill
patent: 4980102 (1990-12-01), Hill

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