Back to results
US 8,507,615 B2Granted
Polyimide resins for high temperature wear applications
AssigneeE. I. Du Pont de Nemours and Company
InventorsJesus G Moralez, Robert Ray Burch, Timothy D. Krizan, Lloyd Abrams
Life of this patent
Estimating the term…
Abstract
Polyimide resin compositions that contain an end-capped rigid aromatic polyimide, graphite and, optionally, a filler selected from sepiolite, attapulgite, kaolinite, or a mixture thereof, 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.
Claims3
A method of preparing a wear resistant polyimide, comprising
- (a) end-capping, 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, a rigid aromatic polyimide having a degree of polymerization (“DP”) of less than about 50 to form an end-capped polyimide;
- and
- (b) admixing the end-capped polyimide with an uncapped, rigid aromatic polyimide having a DP of greater than about 60, in a ratio of about 1 part end-capped polyimide to about 3 to about 10 parts uncapped polyimide by weight.
1 more element
Dependencies are inferred from the claim text.