Title:
タイヤ用ゴム組成物
Document Type and Number:
Japanese Patent JP7473829
Kind Code:
B2
Abstract:
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.
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Inventors:
Hiroshi Takahashi
Masaki Sato
Masaki Sato
Application Number:
JP2022129189A
Publication Date:
April 24, 2024
Filing Date:
August 15, 2022
Export Citation:
Assignee:
Yokohama Rubber Co., Ltd.
International Classes:
C08L15/00; B60C1/00; C08K3/36; C08K5/548; C08L7/00; C08L57/02; C08L93/04
Domestic Patent References:
| JP2013227375A | ||||
| JP2019104484A | ||||
| JP2022174896A |
Foreign References:
| WO2016031476A1 | ||||
| WO2016104144A1 | ||||
| WO2016002506A1 |
Attorney, Agent or Firm:
Clear stream international patent attorney corporation
Takayoshi in the daytime
Masao Sakaizawa
Takayoshi in the daytime
Masao Sakaizawa