Title:
PNEUMATIC TIRE
Document Type and Number:
WIPO Patent Application WO/2022/149491
Kind Code:
A1
Abstract:
Provided is a pneumatic tire in which rolling resistance is reduced while improving dry performance, wet performance, and snow performance, and it is possible to achieve both these objectives at a high level. In the present invention, a rubber composition in which 60–90 parts by mass (inclusive) of silica is compounded with 100 parts by mass of diene rubber is used in a cap tread layer 11, said diene rubber comprising 100 mass% in total of 15–30 mass% (inclusive) of natural rubber, 40–70 mass% (inclusive) of terminal-modified styrene-butadiene rubber having a vinyl content of 35–45 mass% (inclusive), and 15–30 mass (inclusive) of modified butadiene rubber obtained by modifying the active end of a conjugated diene polymer with at least a hydrocarbyloxysilane compound. The hardness Hu of an under tread layer 12 and the hardness Hc of the cap tread layer 11 are such that Hu > Hu, the hardness Hc being 63–67 (inclusive), and the difference ΔH between the hardness Hu and the hardness Hc is 10 or greater.
Inventors:
KAZARIYA AYAKI (JP)
OZAKI MAKOTO (JP)
SAWA HIDEAKI (JP)
OZAKI MAKOTO (JP)
SAWA HIDEAKI (JP)
Application Number:
PCT/JP2021/048184
Publication Date:
July 14, 2022
Filing Date:
December 24, 2021
Export Citation:
Assignee:
YOKOHAMA RUBBER CO LTD (JP)
International Classes:
B60C1/00; B60C11/00; C08K7/02; C08L21/00
Domestic Patent References:
| WO2013180257A1 | 2013-12-05 | |||
| WO2012141158A1 | 2012-10-18 |
Foreign References:
| JP2013252840A | 2013-12-19 | |||
| JP2018111780A | 2018-07-19 | |||
| JPH0781315A | 1995-03-28 | |||
| JP2014148590A | 2014-08-21 |
Attorney, Agent or Firm:
SEIRYU PATENT PROFESSIONAL CORPORATION et al. (JP)
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