Patent ID: 7306665

Claim:
A friction material composition comprising a fibrous material, a binder and a friction adjusting agent, wherein: the binder is a thermosetting resin or a rubber composition, and the friction adjusting agent comprises: (a) spherical secondary aggregates of an activated alumina which have a diameter of 10 to 300 μm, (b) an organic friction adjusting agent selected from the group consisting of cashew dust and rubber dust, and, (c) an inorganic friction adjusting agent other than the spherical secondary aggregates of an activated alumina, wherein each of said spherical secondary aggregates is an aggregate of a plurality of primary particles; and wherein the friction material composition contains 30 to 60% by weight of the fibrous material, 3 to 25% by weight of the binder, 0.1 to 10% by weight of the spherical secondary aggregates of an activated alumina, 1 to 15% by weight of the organic friction adjusting agent and 20 to 50% by weight of the inorganic friction adjusting agent.