Back to results
US 5,688,848 AGranted
Polyimide composition and polyimide composite
AssigneeGeneral Electric Company
InventorsJames A. Cella, Gary K. Shank, Judith A. Serth
Life of this patent
Estimating the term…
Abstract
A polyimide composition and polyimide composite are provided. The composition has a polyimide resin, a reactive plasticizer and a phosphate. The composition is crosslinked and exhibits desired levels of processability and improved thermooxidative stability. The composites have a polyimide resin, a phosphate and reinforcing fibers, and exhibit reduced wear and friction. The compositions and composites are useful for making aircraft engine hardware such as bushings.
Claims8
A cross-linked polyimide composition obtained by combining:
- (a) a polyimide resin,
- (b) a reactive plasticizer having at least two four-membered rings which undergo ring scission at an elevated temperature, said plasticizer being combined at a level of from 5 to 25 percent by weight based on the total weight of the composition, wherein said reactive plasticizer is of the formula:
- ##STR6## and (c) a triaryl phosphate, said phosphate being combined at a level of from 0.25 to 5 percent by weight based on the total weight of the composition.
A composite useful for making bushings, said composite comprising:
- (a) a polyimide resin, said polyimide being present at a level from 20 to 90 percent by weight based on the total weight of the composite,
- (b) a graphite reinforcing fiber, said reinforcing fiber being present at a level of from 10 to 80 percent by weight based on the total weight of the composite, and
- (c) an triaryl phosphate, said phosphate being present at a level of from 0.1 to 5 percent by weight based on the total weight of the composite.
Dependencies are inferred from the claim text.