Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1982-09-20
1983-10-18
Nielsen, Earl A.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525423, 525504, 528 93, 528113, 528114, 528322, 528350, C08G 5940, C08G 7310
Patent
active
044106645
ABSTRACT:
The resins described herein are polyimide-epoxy thermoset resins prepared by reacting a polyepoxide with a solution of an admixture of a polyimide dianhydride with another polyimide component, either a polyimide dianhydride or a polyimide diamine, at least one of which polyimide components is insoluble in the particular solvent in the absence of the other polyimide component or components. "Polyimide dianhydride" is an anhydride-terminated polyimide and "polyimide diamine" is an amine-terminated polyimide as represented by the respective formulas: ##STR1## 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: 3663651 (1972-05-01), Traut
patent: 4277583 (1981-07-01), Waitkus
patent: 4283521 (1981-08-01), Jones
patent: 4366302 (1982-12-01), Gounder et al.
Monacelli Walter J.
Nielsen Earl A.
Plastics Engineering Company
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