| 摘要 |
A rubber composition comprising 100 parts by weight of a rubber component and compounded therewith 30 to 100 parts by weight of a carbon black of the category of hard carbon blacks having a nitrogen adsorption specific surface area (N2SA) of 58 to 139 m2/g, a DBP absorption number of 90 to 150 ml/100 g and having such selective characteristics that the intraaggregate void size, Dp (nm), as measured by mercury porosimetry is equal to or higher than a value calculated by the relational formula [-0.22x(N2SA)+60.8].
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