Friction material for brake
AssigneeMitsubishi Gas Company, Inc.
InventorsKazuyuki Ohya, Norio Sayama
Life of this patent
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Abstract
A friction material for a brake obtained by a process which comprises preparing (I) a composition for a friction material from (A) a binder composition comprising 95-5 parts by weight of a cyanate ester resin and 5-95 parts by weight of a polycyclic aromatic pitch, (B) a fiber reinforcing substrate, and (C) a friction and wear regulator, thermoforming the composition (I) by hot pressing to cure the binder composition (A), and heat-treating the cured product at a temperature of 270.degree.-800.degree. C. to cyclize or semi-carbonize the binder composition (A) is disclosed which has markedly improved anti-fade properties.
Claims12
A friction material for a brake obtained by a process which comprises
- preparing (I) a composition for a friction material from (A) a binder composition comprising 95-5 parts by weight of a cyanate ester resin and 5-95 parts by weight of a polycyclic aromatic pitch, (B) a fibrous reinforcing substrate material consisting mainly of one or more materials selected from the group consisting of steel fiber, steel fiber having an Fe.sub.3 O.sub.4 film formed on the surface thereof, copper fiber, copper alloy fiber, copper fiber having a CuO film formed on the surface thereof, carbon fiber produced at a final calcination temperature of 1100.degree. C. or lower, rock wool, and ceramic fiber, and (C) a friction and wear regulator consisting mainly of one or more agents selected form the group consisting of barium sulfate, carbon graphite, calcium carbonate, molybdenum sulfite, calcium fluoride, and cured resin dust
- thermoforming the composition (I) by hot-pressing to cure the binder composition (A), and
- heat-treating the cured product at a temperature of 270.degree.-800.degree. C. to cyclize or semi-carbonize the binder composition (A).
In a friction material for a brake comprising (A) a binder composition, (B) a fibrous reinforcing substrate material, and (C) a friction and wear regulator, the improvement wherein said binder consists essentially of a cyclized or semi-carbonized binder composition of 95-5 parts by weight of a cyanate ester resin and 5-95 parts by weight of a polycyclic aromatic pitch having a softening point of 150.degree.-230.degree. C.
Dependencies are inferred from the claim text.