IP Library › Granted Patent US 12680586
Granted Patent B2
US 12680586 · App. 17/770,090 · Granted Jul 14, 2026

Friction material

Inventors: Kentaro Owa (Tokyo, JP); Motoyuki Miyaji (Tokyo, JP); Takuya Takada (Tokyo, JP); Kenta Kimura (Tokyo, JP)
Assignee: AKEBONO BRAKE INDUSTRY CO., LTD.
F16D69/026
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Quick Facts
Patent No.
US 12680586
App. No.
17/770,090
Granted
Jul 14, 2026
Kind
B2
Abstract

There is provided a friction material including: a friction modifier; a binder; and a fibrous material. A phosphate-based dispersant is contained as the friction modifier. Preferably, a content of the phosphate-based dispersant is 0.2 mass % to 2.0 mass %. Preferably, the phosphate-based dispersant is at least one selected from a group consisting of sodium hexametaphosphate, sodium polyphosphate, and sodium pyrophosphate.

Claims (17)

1 . A friction material comprising:

a friction modifier;

a binder; and

a fibrous material, wherein

the friction modifier comprises:

a phosphate-based dispersant, and

an abrasive,

wherein a content of the phosphate-based dispersant is 0.2 mass % to 2.0 mass %.

2 . The friction material according to claim 1 , wherein the phosphate-based dispersant is at least one selected from a group consisting of sodium hexametaphosphate, sodium polyphosphate, and sodium pyrophosphate.

3 . The friction material according to claim 1 , wherein the phosphate-based dispersant is at least one selected from a group consisting of sodium hexametaphosphate, sodium polyphosphate, and sodium pyrophosphate.

4 . The friction material according to claim 1 , wherein a content of the abrasive is 1.0 mass % to 20.0 mass %.

5 . The friction material according to claim 1 , wherein a content of the abrasive is 3.0 mass % to 15.0 mass %.

6 . The friction material according to claim 1 , wherein a content of the abrasive is 1.0 mass % to 11.0 mass %.

7 . The friction material according to claim 1 , wherein the abrasive is at least one selected from a group consisting of alumina, silica, magnesium oxide, zirconia, zirconium silicate, chromium oxide, triiron tetroxide, and chromate.

8 . The friction material according to claim 1 , wherein the abrasive is at least one selected from a group consisting of zirconium silicate and triiron tetroxide.

9 . The friction material according to claim 1 , wherein the content of the phosphate-based dispersant is 0.5 mass % to 2.0 mass %.

10 . The friction material according to claim 1 , wherein the content of the phosphate-based dispersant is 1.0 mass % to 2.0 mass %.