TIRE RUBBER COMPOSITION

WIPO Patent Application WO/2024/038812

A1

Provided is a tire rubber composition which is excellent in terms of wear resistance, wet performance, and low rolling resistance, for which the low rolling resistance has little temperature dependence, and which is excellent in terms of extrusion molding processability, as well. This tire rubber composition is characterized in that: 60-90 parts by mass of silica and 15-40 parts by mass of a thermoplastic resin are added to 100 parts by mass of a diene rubber containing 50-75 mass% of an end-modified SBR (A) having a weight-average molecular weight of 300,000-500,000 and a glass transition temperature of at most -50°C, 0-50 mass% of an end-modified SBR (B) having a weight-average molecular weight of at least 600,000, and 0-30 mass% of a natural rubber, and a silane coupling agent that has a mercapto structure is added thereto in a quantity that is 2-15 mass% of the mass of the silica; the total mass of the end-modified SBR (B) and the natural rubber is at least 1/3 of the mass of the end-modified SBR (A); the weight-average molecular weight of a mixture composed of the end-modified SBR (B) and the natural rubber is at least 700,000; and the average glass transition temperature of the diene rubber is at most -50°C.

TAKAHASHI TAKUJI (JP)
SATO MASAKI (JP)

PCT/JP2023/029099

February 22, 2024

August 09, 2023

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YOKOHAMA RUBBER CO LTD (JP)

C08L15/00; B60C1/00; C08K3/36; C08K5/548; C08L7/00; C08L45/00; C08L57/02; C08L65/00; C08L93/04

WO2016031476A1	2016-03-03
WO2016104144A1	2016-06-30
WO2016002506A1	2016-01-07

JP7168029B1	2022-11-09
JP2013227375A	2013-11-07
JP2019104484A	2019-06-27

SEIRYU PATENT PROFESSIONAL CORPORATION et al. (JP)

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