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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 (Technical Center 3-1-1, Ogawahigashi-cho, Kodaira-sh, Tokyo 31, 1878531, JP)
Application Number:
JP2007/069064
Publication Date:
April 24, 2008
Filing Date:
September 28, 2007
Export Citation:
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Assignee:
BRIDGESTONE CORPORATION (10-1, Kyobashi 1-chome Chuo-k, Tokyo 40, 1048340, JP)
株式会社ブリヂストン (〒40 東京都中央区京橋1丁目10番1号 Tokyo, 1048340, JP)
International Classes:
C08L7/00; B60C1/00; B60C13/00; C08K3/04; C08L9/00
Foreign References:
JP2006183036A2006-07-13
JP2006152211A2006-06-15
JP2006152213A2006-06-15
JP2006151278A2006-06-15
JP2002097308A2002-04-02
JP2006152155A2006-06-15
JP2006152215A2006-06-15
JPH07278352A1995-10-24
JPH10195249A1998-07-28
JPH0551490A1993-03-02
Other References:
See also references of EP 2067819A4
Attorney, Agent or Firm:
SUGIMURA, Kenji et al. (36F Kasumigaseki Common Gate West, 3-2-1 Kasumigaseki, Chiyoda-ku, Tokyo 13, 1000013, JP)
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