| 摘要 |
A rubber composition prepared by blending 15 to 85 parts by weight of silica per 100 parts by weight of a rubber component comprising natural rubber and/or diene base synthetic rubber and 1 to 15% by weight of a dispersion-improving agent based on the amount of the silica described above. Further, a rubber composition prepared by blending 20 to 60 parts by weight of silica and 30 to 80 parts by weight of carbon black having a cetyl trimethylammonium bromide-adsorbing amount (CTAB) of 120 m2/g or more and a dibutyl phthalate-absorbing amount (DBP) of 120 ml/100 g or more per 100 parts by weight of a rubber component comprising natural rubber and/or diene base synthetic rubber, and 3 to 15% by weight of a dispersion-improving agent based on the amount of the silica described above, wherein the total amount of silica and carbon black is 50 to 120 parts by weight. A specific nitrogen-containing carbonyl compound or silicone oil is used as a dispersion-improving agent.
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