Title:
RUBBER COMPOSITION FOR TIRES
Document Type and Number:
WIPO Patent Application WO/2023/190688
Kind Code:
A1
Abstract:
The present invention provides a rubber composition for tires, the rubber composition enabling the achievement of further improved balance among on-snow performance, wet performance and wear resistance. The present invention provides a rubber composition which is obtained by adding 70 parts by mass or more of an inorganic filler that contains silica and carbon black to 100 parts by mass of a diene rubber that contains 30% by mass to 60% by mass of a terminally modified styrene-butadiene rubber and has an average glass transition temperature of -70°C to -55°C, wherein: the silica content in the inorganic filler is 60% by mass or more; and the terminally modified styrene-butadiene rubber contains 23% by mass or more of an extending oil, while having a styrene unit content of 37% by mass or less. This rubber composition is characterized in that the tensile stress Mi of a cured product thereof at 300% deformation and the tensile stress Ma of the cured product at 300% deformation after a heat treatment at 50°C for 1,000 hours satisfy formula (Ma - Mi)/Mi ≤ 0.3.
Inventors:
KUROSAKA KAORI (JP)
Application Number:
PCT/JP2023/012811
Publication Date:
October 05, 2023
Filing Date:
March 29, 2023
Export Citation:
Assignee:
YOKOHAMA RUBBER CO LTD (JP)
International Classes:
C08L15/00; B60C1/00; C08K3/013
Domestic Patent References:
| WO2015186755A1 | 2015-12-10 | |||
| WO2019163519A1 | 2019-08-29 | |||
| WO2020110941A1 | 2020-06-04 |
Foreign References:
| JP2014210829A | 2014-11-13 |
Attorney, Agent or Firm:
SEIRYU PATENT PROFESSIONAL CORPORATION et al. (JP)
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