# US 10,865,844 B2 · Friction material

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- Number: US 10,865,844 B2
- Document ID: US10865844B2
- Status: Granted
- Kind: B2
- Application number: 15/533,993
- Filed: 2015-11-17
- Published: 2018-11-01
- Granted: 2020-12-15
- Earliest claimed: 2014-12-12
- Applicants: Nisshinbo Brake, Inc.
- Inventors: Wataru Shimada; Yuji Yadomaru; Tsuyoshi Kondo
- Web page: https://patentgrep.com/patent/US10865844B2

## CPC

- F16D 69/026: {containing fibres}
- C08G 59/08: from phenol-aldehyde condensates
- C08K 5/315: Compounds containing carbon-to-nitrogen triple bonds
- F16D 69/025: {Compositions based on an organic binder}
- F16D 2200/0069: being characterised by their size
- F16D: COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)

## Abstract

To provide a friction material used for a brake shoe of a drum brake for a passenger car, which continuously reduces generation of low frequency noise and provides excellent braking effectiveness and wear resistance and is manufactured by forming a friction material composition which contains no cleavage substance, 8-12 weight % of a phenolic thermosetting resin as the binder, 9-18 weight % of cashew dust as the organic friction modifier, 6-12 weight % of a rubber particle, where the total amount of the cashew dust and rubber particle is 18-25 weight %, and 4-10 weight % of the aluminum particle as the inorganic friction modifier, all relative to the total amount of the friction material composition. The friction material contains the phenolic thermosetting resin consists of a straight novolak phenolic resin and the unvulcanized nitrile rubber (NBR) particle.

## Claims

### Claim 1

A friction material used for a brake shoe of a drum brake for a passenger car, which is manufactured by forming a friction material composition containing a binder, an organic fiber, an inorganic friction modifier, an organic friction modifier, a pH adjuster, and an inorganic filler, wherein
said friction material composition does not comprise graphite, mica, or vermiculite but comprises 8-12 weight %, relative to the total amount of the friction material composition, of a phenolic thermosetting resin as the binder, 9-18 weight %, relative to the total amount of the friction material composition, of cashew dust and 6-12 weight %, relative to the total amount of the friction material composition, of a rubber particle as the organic friction modifier, where the total amount of the cashew dust and rubber particle is 18-25 weight % relative to the total amount of the friction material composition, and 4-10 weight %, relative to the total amount of the friction material composition, of metallic aluminum particle with an average particle diameter of 50-300 μm as the inorganic friction modifier.

### Claim 2 (depends on 1)

The friction material according to claim 1, wherein
the phenolic thermosetting resin consists of a straight novolak phenolic resin.

### Claim 3 (depends on 1)

The friction material according to claim 1, wherein
said friction material composition contains an unvulcanized nitrile rubber (NBR) particle as a part of the rubber particle or an entire part of the rubber particle.

### Claim 4 (depends on 2)

The friction material according to claim 2, wherein
said friction material composition contains an unvulcanized nitrile rubber (NBR) particle as a part of the rubber particle or an entire part of the rubber particle.