Steam resistant modified polyimide foams

Details Steam resistant modified polyimide foams Steam resistant modified polyimide foams

1986-06-26

1987-11-24

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521184, 521189, 521180, 528188, 528229, 528321, 528322, 528324, C08J 922

Patent

active

047089725

ABSTRACT:
A composition and a process for the preparation of modified polyimide foams possessing outstanding resistance to high humidity environments which comprises the step of preparing a foamable composition by mixing a solution of an ester of benzophenonetetracarboxylic acid dianhydride and caprolactam with a polyamine to form a resin precursor which when heated foams contemporaneously with the polymerization of the reactants. Two solvents with different boiling points are used to produce a two phase system which yields spray dried powders completely free of the lower boiling point solvent.

REFERENCES:
patent: 4425441 (1984-01-01), Gagliani et al.
patent: 4426463 (1984-01-01), Gagliani 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.

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