Friction materials
AssigneeFerodo Limited
InventorJohn Chester
Life of this patent
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Abstract
Asbestos-free friction material compositions containing from about 20 to 45% by volume of the material of a thermoset binder of a phenol formaldehyde resin and optionally a heat and chemical reistant rubber, up to 10% by volume of an inert mineral filler and as the sole fibrous reinforcement 5 to 15% by volume of short lengths of steel fibers are disclosed. The compositions are useful as brake pads and the like and has properties comparable with asbestos-based materials.
Claims11
A friction material composition suitable for moulded friction pads consisting essentially of a thermosetting binder, a fibrous reinforcement including additional fillers and additives, wherein:
- (a) the thermosetting binder comprises a phenol formaldehyde resin and a heat and chemical resistant rubber which binder constitutes from 20% to 45% by volume of the friction material composition of which at least half of said binder is said resin;
- (b) the fibrous reinforcement consists solely of short lengths of steel fiber in an amount between 5% and 15% by volume of the composition;
- (c) at least 10% by volume of the composition is an inert mineral filler;
- and
- (d) the balance of the composition consists substantially entirely of inorganic friction and wear modifiers in an amount up to 40% by volume.
A friction material composition suitable for moulded friction pads which consists essentially of a thermosetting binder, a fibrous reinforcement and other fillers and additives wherein:
- (a) the thermosetting binder comprises a phenol formaldehyde resin and makes up 20% to 45% by volume of the friction material composition of which at least half of said binder is said resin;
- (b) the fibrous reinforcement consists solely of short lengths of steel fiber in an amount between 5% and 15% by volume of the composition;
- (c) 10% to 35% by volume of the composition is an inert mineral filler, not being a metal oxide;
- and
- (d) the balance of the composition being friction and wear modifiers in an amount up to 40% by volume of the composition provided that no more than 7% of said friction and wear modifiers is metal.
Dependencies are inferred from the claim text.