invention include a coal tar pitch from allied signal corporation morristown n j with constituents having molecular weights in the 700 to 900 range and a melting range of 60 u00b0 c to 150 u00b0 c another example of a suitable pitch is a petroleum pitch a 240 from the ashland petroleum company ashland ky this petroleum pitch has a higher molecular weight with a softening point above 120 u00b0 c polyimides are a group of high molecular weight polymers having an imide group conhco or conco in each repeat unit of the polymer chain an example of a polyimide resinous polymer suitable for use in the resin bonding systems of the subject invention is superimide 800 a product from b f goodrich an addition type polymer of the polyimide type this polyimide consists essentially of aromatic organic moieties with polyimide linkages as provided such polymers are formed with amine end groups or dianhydride end groups which permit crosslinking into a thermoset material the thermoset superlmide 800 polymer and other suitable polyimide resins have glass transition temperatures in the range of 660 u00b0 f to 840 u00b0 f as stated above it is expected there will be some high performance friction material applications or brake lining applications in which the pitch and polyirnide combinations within the above stated ranges will serve well because of their high temperature and high strength properties however due to the expense of the high amount of polyimide resin in such two component resin binder formulations the mixture will be.