Polyimide foam prepared from amino terminated butadiene acrylonitrile reactant
AssigneeImi-Tech Corporation
InventorsRaymond Lee, David W. Okey, Gregory A. Ferro
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Abstract
A polyimide and a process for its preparation wherein the polyimide is prepared from reaction of an organic tetracarboxylic acid or derivative thereof with a mixture of an aromatic diamine and an amine-terminated butadiene-nitrile copolymer. The polyimides of the invention are particularly useful in the preparation of flexible foams.
Claims9
A polyimide foam prepared from a polyamide-acid/ester prepolymer synthesized by reaction of an organic tetracarboxylic acid ester derivative with (a) 0.05 to 7.5 mole % of at least one liquid diamine selected from the group consisting of a polymer having the formula:
- ##STR5## wherein R is either a phenylene group or an alkylene group, R.sub.1 is hydrogen or methyl, n is an integer preferably below 20 and x and y are each independent integers ranging from 1 to 25 and (b) an aromatic diamine having the formula:
- H.sub.2 N--R.sub.2 --NH.sub.2
- wherein R.sub.2 is an aromatic group containing 5 to 16 carbon atoms.
A process for the preparation of a polyimide foam comprising reacting an organic tetracarboxylic acid ester with (a) 0.05 to 7.5 mole % of at least one liquid diamine selected from the group consisting of a polymer having the formula:
- ##STR7## wherein R is either a phenylene group or an alkylene group, R.sub.1 is hydrogen or methyl, n is an integer preferably below 20 and x and y are each independent integers ranging from 1 to 25 and (b) an aromatic diamine having the formula:
- H.sub.2 N--R.sub.2 --NH.sub.2
- wherein R.sub.2 is an aromatic group containing 5 to 16 carbon atoms, and heating the resulting mixture to polymerize the mixture and convert it to a foam.
Dependencies are inferred from the claim text.