| abstract |
As a rubber composition capable of greatly improving on-ice performance while suppressing a decrease in abrasion resistance of a tire, the present invention provides a rubber composition characterized by the following: containing silica and at least three types of diene-based polymers that form a plurality of mutually incompatible polymer phases; in that a diene-based polymer (B), which is blended at a quantity of 10 mass% or more relative to the total quantity of the diene-based polymers and which does not have the lowest or the highest glass transition temperature (Tg) among the diene-based polymers, is modified by a silicon atom-containing compound, and satisfies the relationship represented by the formula St+Vi/2 ≤ 33 [in the formula, St is the content (mass%) of bonded styrene in the diene-based polymer (B) and Vi is the quantity (mass%) of vinyl bonds in the conjugated diene compound portion of the diene-based polymer (B)]; and in that the blending quantity of the silica is 25 parts by mass or more relative to a total of 100 parts by mass of the diene-based polymers. |