Patent ID: 7696261
Filing Date: 2010-04-13
Classification: F16D,Y10T

Abstract:
1. A friction material comprising a fibrous base material impregnated with at least one curable resin, the fibrous base material comprising a porous primary layer and a secondary layer, the porous primary layer comprising less fibrillated aramid fibers having a freeness of greater than 300 on the Canadian Standard Freeness index, a silica filler material, synthetic graphite particles, and at least one of cotton fibers or carbon fibers, the secondary layer comprising a mixture of carbonaceous material and silica friction modifying particles on at least one surface of the primary layer, wherein the silica friction modifying particles have an average size ranging from about 0.5 to about 20 microns, and wherein the carbonaceous material comprises at least one of carbon fibers having an average length that ranges from about 0.5 to about 6 mm, or carbon particles having an average diameter that ranges in size from about 1 to about 80 μm.