Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1983-03-16
1985-04-09
Nielsen, Earl A.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
523445, 523466, 523468, 525530, 525903, 528 94, 528 99, 528117, 528322, C08G 5940, C08G 8300
Patent
active
045102724
ABSTRACT:
A novel composition is described comprising an admixture of an unsaturated polyimide prepolymer essentially free of terminal amine groups and an epoxy resin having a homopolymerization temperature that is greater than the temperature at which the polyimide polymerizes. These compositions maintain the superior glass transition temperatures and moisture resistance of the polyimide while picking up the desirable handling properties of the epoxy. These compositions have excellent high temperature and moisture resistant properties and excellent storage stability. For instance, carbon composites made with these materials have exhibited 60% shear property retention at 450.degree. F. after being boiled in water for one week. Also described are prepregs comprising the novel composition, methods for curing the novel composition to obtain the superior properties, and articles of manufacture comprising the novel composition.
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Lee & Neville, Handbook of Epoxy Resins, McGraw-Hill, N.Y. 1967, pp. 2-21.
Avco Corporation
Neuner George W.
Nielsen Earl A.
Ogman Abraham
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