Title:
RUBBER COMPOSITION FOR TIRES
Document Type and Number:
WIPO Patent Application WO/2022/113722
Kind Code:
A1
Abstract:
Provided is a rubber composition for tires with which it is possible to reduce heat generation while ensuring a good balance of hardness and elongation in the sidewalls, and to achieve a high level of both these aspects of performance. 30 parts by mass or more of carbon black having a CTAB adsorption specific surface area of 100 m2/g or less are blended into 100 parts by mass of a conjugated diene copolymer comprising 20–60 mass% of a first conjugated diene-based copolymer containing an isoprene component, and 40–80 mass% of a second conjugated diene-based copolymer containing syngiotacticic-1,2-polybutadiene, the syngiotacticic-1,2-polybutadiene used has a crystallization component content of 90% or more, a melting point of 130°C or less, and a glass transition temperature Tg of −20°C or more, and the crystallization component in the second conjugated diene-based copolymer is 30 mass% or less.
Inventors:
NOGUCHI FUMITOSHI (JP)
Application Number:
PCT/JP2021/041110
Publication Date:
June 02, 2022
Filing Date:
November 09, 2021
Export Citation:
Assignee:
YOKOHAMA RUBBER CO LTD (JP)
International Classes:
B60C1/00; B60C13/00; C08K3/04; C08L7/00; C08L9/00
Domestic Patent References:
| WO2020183008A1 | 2020-09-17 |
Foreign References:
| JP2016060789A | 2016-04-25 | |||
| JP2020117579A | 2020-08-06 | |||
| JP2016166297A | 2016-09-15 | |||
| JP2015124284A | 2015-07-06 |
Attorney, Agent or Firm:
SEIRYU PATENT PROFESSIONAL CORPORATION et al. (JP)
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