Friction materials

Details Friction materials Friction materials

1980-05-14

1982-01-12

Briggs, Sr., Wilbert J.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C08L 902, C08L 6110

Patent

active

043104525

ABSTRACT:
The invention concerns a composition for a friction material e.g. for a brake pad, of the type containing a fibrous reinforcement, a binder and various additives.
The composition contains a thermoset binder including a phenol-formaldehyde resin and making up 20 to 60% by volume of the material. Besides the resin the binder can also include a heat and chemical resistant rubber, but the phenol-formaldehyde resin makes up at least 10% by volume of the composition.
The composition includes a fibre-based reinforcement which makes up 10 to 35% by volume of the material and consists of a mixture of steel fibres or glass fibres with one or more other non-asbestos inorganic reinforcing materials e.g. steel fibre and mica, or steel fibre and milled glass.
The friction material contains no asbestos, but has properties comparable with asbestos-based materials.

REFERENCES:
patent: 3007890 (1961-11-01), Twiss et al.
patent: 3455868 (1969-07-01), D'Alessandro
patent: 3835118 (1974-09-01), Rhee et al.
patent: 3956545 (1976-05-01), Afflerback et al.
patent: 3967037 (1976-06-01), Marzocchi et al.
patent: 4051097 (1977-09-01), Aldrich
patent: 4119591 (1978-10-01), Aldrich
patent: 4125496 (1978-11-01), McGinnis
"Improving Brake Safety and Performance" Machine Design vol. 50, No. 15 (6/1977).

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