# US 2017/0254378 A1 · Friction material

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- Number: US 2017/0254378 A1
- Document ID: US20170254378A1
- Status: Published application
- Kind: A1
- Application number: 15/447,309
- Filed: 2017-03-02
- Published: 2017-09-07
- Earliest claimed: 2016-03-07
- Assignees: Akebono Brake Industry Co., Ltd.
- Applicants: Akebono Brake Industry Co., Ltd.
- Inventors: Takuya TAKADA; Motoyuki MIYAJI; Toru KAWATA
- Web page: https://patentgrep.com/patent/US20170254378A1

## CPC

- F16D 69/026: {containing fibres}
- C08K 7/02: Fibres or whiskers
- C08L 61/06: of aldehydes with phenols
- C08L 2205/16: Fibres; Fibrils
- F16D 2200/0065: Inorganic, e.g. non-asbestos mineral fibres
- F16D 2200/0069: being characterised by their size
- F16D: COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

A friction material includes a fiber base material, a friction modifying material and a binder. The friction modifying material includes alumina particles including, as a main component, θ-alumina particles. The θ-alumina particles are contained in an amount of 1 mass % or more in the friction material.

## Claims

### Claim 1

A friction material comprising a fiber base material, a friction modifying material and a binder, wherein
the friction modifying material comprises alumina particles comprising, as a main component, θ-alumina particles, and
the θ-alumina particles are contained in an amount of 1 mass % or more in the friction material.

### Claim 2 (depends on 1)

The friction material according to claim 1, wherein the θ-alumina particles have a specific surface area of 40 m2/g or more and 150 m2/g or less.