Polyimide-epoxy thermoset resins

Details Polyimide-epoxy thermoset resins Polyimide-epoxy thermoset resins

1982-09-20

1984-12-11

Marquis, Melvyn I.

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

C08G28304

Patent

active

044878940

ABSTRACT:
The resins described herein are polyimide-epoxy thermoset resins prepared by reacting a polyepoxide in two steps, first with a solution of a polyimide dianhydride and subsequently with a polyimide diamine, there being enough polyepoxide added initially to react completely with all the anhydride groups and preferably enough polyepoxide added initially to react with both the anhydride and amide groups. "Polyimide dianhydride" is an anhydride-terminated polyimide and "polyimide diamine" is an amine-terminated polyimide as represented by the respective formulas: ##STR1## and ##STR2## wherein Ar', Ar and n are as defined hereinafter. For use in the present compositions, the polyimide dianhydride has an anhydride activity of at least 0.17 as defined herein, and the ratio of epoxy equivalent to anhydride plus amine equivalents is at least 1/1. By employing a two step reaction scheme, the process offers a more tractable polyimide-epoxy intermediate resin that can be processed into void-free products with superior mechanical properties than polyimide-epoxy thermosets shown in the prior art.

REFERENCES:
patent: 3416994 (1968-12-01), Chalmers et al.
patent: 3663651 (1972-05-01), Traut
patent: 4277583 (1981-07-01), Waitkus
patent: 4410664 (1983-10-01), Lee

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