Title:
RUBBER COMPOSITION FOR TIRE TREADS
Document Type and Number:
WIPO Patent Application WO/2014/002706
Kind Code:
A1
Abstract:
The present invention is a rubber composition for tire treads, which is characterized in that: the temperature at the peak position of the temperature curve of tan δ is within the range from -16.0°C to -6.0°C (inclusive); tan δ at the peak position is larger than 1.13; tan δ at 0°C is 0.95 or more; and the value obtained by dividing the absolute value of the difference between tan δ at -5°C and tan δ at 5°C by the temperature difference between -5°C and 5°C, namely {|(tan δ at -5°C) - (tan δ at 5°C)|/10} (/°C) is smaller than 0.045/°C. Specifically, a rubber composition for tire treads, which contains a filler and a rubber component that contains at least two kinds of styrene-butadiene copolymer rubbers having different bonded styrene contents, and which is characterized in that: the difference between the bonded styrene content (St(A)) of a styrene-butadiene copolymer rubber (A) having a higher bonded styrene content and the bonded styrene content (St(B)) of a styrene-butadiene copolymer rubber (B) having a lower bonded styrene content, namely {St(A) - St(B)} is 6-22% by mass; tan δ at 0°C is 0.95 or more; and the value obtained by dividing the absolute value of the difference between tan δ at -5°C and tan δ at 5°C by the temperature difference between -5°C and 5°C, namely {|(tan δ at -5°C) - (tan δ at 5°C)|/10} (/°C) is smaller than 0.045/°C. The present invention provides a rubber composition for tire treads, which achieves a better balance between low heat generation properties and wet braking performance.
Inventors:
KAWASHIMA KEISUKE (JP)
Application Number:
PCT/JP2013/065513
Publication Date:
January 03, 2014
Filing Date:
June 04, 2013
Export Citation:
Assignee:
BRIDGESTONE CORP (JP)
KAWASHIMA KEISUKE (JP)
KAWASHIMA KEISUKE (JP)
International Classes:
C08L9/06; C08C19/25; C08L15/00
Domestic Patent References:
| WO2009084667A1 | 2009-07-09 |
Foreign References:
| JPH0967469A | 1997-03-11 | |||
| JP2010275386A | 2010-12-09 | |||
| JP2010275386A | 2010-12-09 |
Other References:
See also references of EP 2868696A4
Attorney, Agent or Firm:
OHTANI, Tamotsu et al. (JP)
Tamotsu Otani (JP)
Tamotsu Otani (JP)
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