| 摘要 |
A rubber composition comprising 100 parts by weight of a rubber component which consists of a natural rubber alone or a blend of a natural rubber with a dienic synthetic rubber and from 35 to 100 parts by weight of a carbon black compounded into the rubber. The carbon black has a nitrogen adsorption specific surface area (N2SA) of 100 to 160 m2/g and also a true specific gravity and a mode diameter of intraaggregate pore ( &upbar& Dp) which satisfy, respectively, the relations 1 true specific gravity</=1.8379-0.0006xN2SA(1) <IMAGE> (2) where &upbar& Dp in the formula (2) represents the mode diameter at the maximum frequency in the intraaggregate pore diameter distribution of the carbon black determined with a differential scanning calorimeter (DSC), and DBP represents the dibutyl phthalate absorption number.
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