Title:
TIRE
Document Type and Number:
WIPO Patent Application WO/2020/075832
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide a tire capable of reducing rolling resistance while having exceptional grip performance on snowy roads and wet roads. In order to solve the above problem, the present invention is a tire equipped with a tread portion having a base rubber and a cap rubber positioned to the outside of the base rubber in the tire radial direction, wherein: the base rubber has a storage modulus E' of less than 6 MPa; the cap rubber includes a rubber component (A) including a modified conjugated diene polymer (A1), a reinforcing filler (B) including silica (B1) and carbon black (B2), and a low-temperature softener (C); the modified conjugated diene polymer (A1) has a weight-average molecular weight from 20 × 104 to 300 × 104, contains from 0.25% by mass to 30% by mass of a modified conjugated diene polymer having a molecular weight from 200 × 104 to 500 × 104 relative to the total amount of the modified conjugated diene polymer (A1), and has a shrink factor (g') of less than 0.64; and the silica (B1) content is 65-155 parts by mass per 100 parts by mass of the rubber component (A).
Inventors:
ISHIKAWA SATOSHI (JP)
KUMAKI KENTARO (JP)
KUMAKI KENTARO (JP)
Application Number:
PCT/JP2019/040138
Publication Date:
April 16, 2020
Filing Date:
October 10, 2019
Export Citation:
Assignee:
BRIDGESTONE CORP (JP)
International Classes:
C08L21/00; B60C1/00; B60C11/00; C08C19/25; C08K3/04; C08K3/36; C08K5/101; C08L15/00; C08L101/00
Foreign References:
| JP2008013609A | 2008-01-24 | |||
| JP2014189738A | 2014-10-06 | |||
| JP2018028018A | 2018-02-22 | |||
| JP2014031405A | 2014-02-20 | |||
| JPS63314255A | 1988-12-22 | |||
| JPS62268707A | 1987-11-21 |
Attorney, Agent or Firm:
SUGIMURA Kenji (JP)
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