Title:
RUBBER COMPOSITION
Document Type and Number:
WIPO Patent Application WO/2018/151148
Kind Code:
A1
Abstract:
Provided is a rubber composition which has improved adhesion to steel cords and improved tire durability in comparison to conventional rubber compositions. A rubber composition which is obtained by blending 40-80 parts by mass of carbon black and a cobalt borate neodecanoate represented by chemical formula (1), a phenolic resin, a curing agent, sulfur and a vulcanization accelerator into 100 parts by mass of a diene rubber that contains a natural rubber, and which is characterized in that: the carbon black has a DBP oil absorption of from 50 × 10-5 m3/kg to 80 × 10-5 m3/kg and an iodine adsorption of from 100 g/kg to 150 g/kg; a vulcanized rubber thereof has a dynamic storage elastic modulus (E') of 8 MPa or more at a dynamic strain of 2% at 20°C, a loss tangent (tan δ) of 0.20 or less at 60°C, and a number of repetition until breakage of 45,000 or more in a constant strain fatigue test at a strain of 60% at 400 rpm.
Inventors:
SUGIMOTO HIROKI (JP)
NOMAGUCHI TSUYOSHI (JP)
NOMAGUCHI TSUYOSHI (JP)
Application Number:
PCT/JP2018/005065
Publication Date:
August 23, 2018
Filing Date:
February 14, 2018
Export Citation:
Assignee:
YOKOHAMA RUBBER CO LTD (JP)
International Classes:
B60C1/00; C08L7/00; C08K3/04; C08K5/55; C08L9/00; C08L61/04
Domestic Patent References:
| WO2012099117A1 | 2012-07-26 |
Foreign References:
| JP2012177021A | 2012-09-13 | |||
| JP2011231221A | 2011-11-17 | |||
| JP2011157525A | 2011-08-18 | |||
| JP2002327093A | 2002-11-15 | |||
| JPS59109538A | 1984-06-25 | |||
| JPS6248742A | 1987-03-03 | |||
| JP2002338734A | 2002-11-27 | |||
| JPH06212025A | 1994-08-02 | |||
| JP2007099868A | 2007-04-19 |
Other References:
See also references of EP 3584279A4
Attorney, Agent or Firm:
SEIRYU PATENT PROFESSIONAL CORPORATION et al. (JP)
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