Polyimide foam of desired density

Details Polyimide foam of desired density Polyimide foam of desired density

1992-10-13

1993-08-10

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521 88, 521183, 521184, 521185, 521189, C08J 912

Patent

active

052349667

ABSTRACT:
Polyimide foam of desired density is produced by adding to a polyimide precursor comprising carboxylic and diamine components at least one foam-enhancing polar, protic additive of the formula ROH, where R is hydrogen, or C.sub.1 to C.sub.12 linear or branched alkyl or cycloalkyl, unsubstituted or substituted with halo, aryl, alkoxy or hydroxy, and heating the resultant slurry to a temperature that does not exceed about 105.degree. C. to form a homogeneous melt. When heated to a higher temperature the melt foams and cures. The density of the foam is affected by the amount of foam-enhancing additive which is utilized.

REFERENCES:
patent: Re30213 (1980-02-01), Gagliani et al.
patent: 3554939 (1971-01-01), Lavin et al.
patent: 4594208 (1986-06-01), Krutchen et al.
patent: 4621015 (1986-11-01), Long et al.
patent: 4855331 (1989-08-01), Lanier
patent: 4897432 (1990-01-01), Lee

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