Patent ID: 8507615

Claim:
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 R 4 , R 5 , R 6 , and R 7 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.