Polyimide resins for high temperature wear applications
AssigneeE.I. du Pont de Nemours and Company
InventorsJesus G. Moralez, Susan H. Tilford, Robert Ray Burch, Shekhar Subramoney
Life of this patent
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Abstract
Polyimide resin compositions that contain an end-capped rigid aromatic polyimide, graphite and carbon filaments are found to exhibit low wear at high temperatures. Such compositions are especially useful in molded articles that are exposed to wear conditions at high temperatures such as aircraft engine parts.
Claims17
A composition comprising in admixture (a) about 40 weight parts or more and yet about 92 weight parts or less of a rigid polyimide that is end-capped with phthalic anhydride, or a derivative of phthalic anhydride, as represented by the structure of the following Formula (IV):
- wherein R4, R5, R6, and R7 are each independently H, Br, Cl, F, alkyl, alkoxy, or fluoroalkyl;
- (b) about 8 weight parts or more and yet about 60 weight parts or less graphite;
- and (c) about 0.5 weight parts or more and yet about 10.0 weight parts or less of carbon filament.
Dependencies are inferred from the claim text.