Title:
RUBBER COMPOSITION FOR SIDE RUBBER AND PNEUMATIC RADIAL TIRE FOR HEAVY LOAD USING THE SAME
Document Type and Number:
WIPO Patent Application WO/2008/047582
Kind Code:
A1
Abstract:
Disclosed is a rubber composition for side rubbers, which has good workability and reduced hysteresis loss without decreasing durability of side rubbers. Specifically disclosed is a rubber composition for side rubbers, which is obtained by blending 35-55 parts by mass of a filler containing a carbon black of at least FEF-grade per 100 parts by mass of a rubber component which is composed of at least one of a natural rubber and a synthetic polyisoprene rubber, and another synthetic diene rubber. This rubber composition for side rubbers is characterized in that the blending amount of the carbon black of at least FEF-grade is 15-55 parts by mass, and tan δ and the total blending amount of the filler at 25˚C satisfy the following formula (I). tan δ / (total blending amount of filler) ≤ 0.0025 (I)
Inventors:
OOHARA MASASHI (JP)
Application Number:
PCT/JP2007/069064
Publication Date:
April 24, 2008
Filing Date:
September 28, 2007
Export Citation:
Assignee:
BRIDGESTONE CORP (JP)
OOHARA MASASHI (JP)
OOHARA MASASHI (JP)
International Classes:
C08L7/00; B60C1/00; B60C13/00; C08K3/04; C08L9/00
Foreign References:
| JP2006183036A | 2006-07-13 | |||
| JP2006152211A | 2006-06-15 | |||
| JP2006152213A | 2006-06-15 | |||
| JP2006151278A | 2006-06-15 | |||
| JP2002097308A | 2002-04-02 | |||
| JP2006152155A | 2006-06-15 | |||
| JP2006152215A | 2006-06-15 | |||
| JPH07278352A | 1995-10-24 | |||
| JPH10195249A | 1998-07-28 | |||
| JPH0551490A | 1993-03-02 |
Other References:
See also references of EP 2067819A4
Attorney, Agent or Firm:
SUGIMURA, Kenji et al. (3-2-1 Kasumigaseki, Chiyoda-ku, Tokyo 13, JP)
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