US 11,732,116 B2
Rubber composition for tire tread and tire
Keiji Takagi, Kobe (JP); and Tatsuya Miyazaki, Kobe (JP)
Assigned to Sumitomo Rubber Industries, Ltd., Hyogo (JP)
Appl. No. 17/259,460
Filed by Sumitomo Rubber Industries, Ltd., Hyogo (JP)
PCT Filed Aug. 6, 2019, PCT No. PCT/JP2019/030955
§ 371(c)(1), (2) Date Jan. 11, 2021,
PCT Pub. No. WO2020/032053, PCT Pub. Date Feb. 13, 2020.
Claims priority of application No. 2018-150693 (JP), filed on Aug. 9, 2018.
Prior Publication US 2021/0277212 A1, Sep. 9, 2021
Int. Cl. C08L 9/06 (2006.01)
CPC C08L 9/06 (2013.01) [C08L 2205/025 (2013.01); C08L 2205/035 (2013.01)] 12 Claims
 
1. A rubber composition for a tire tread, comprising
a diene-based rubber component;
a microcrystalline wax having a melting point of from 72 to 84° C.; and
an aluminum hydroxide having a nitrogen absorption specific surface area of 3.0 to 60.0 m2/g,
wherein the microcrystalline wax comprises a branched alkane of 40 to 70 carbon atoms and a linear alkane of 45 or more carbon atoms, and,
wherein, based on 100 parts by mass of the diene-based rubber component, a content of the branched alkane of 40 to 70 carbon atoms is 0.5 to 6.0 parts by mass, a content of the linear alkane of 45 or more carbon atoms is 0.05 to 3.5 parts by mass and a content of the aluminum hydroxide of a nitrogen absorption specific surface area of 3.0 to 60.0 m2/g is 1 to 35 parts by mass.