Patent ID: 10711121

Abstract:
A rubber composition has: at least three types of diene polymers forming a plurality of polymer phases immiscible with each other; and silica, wherein: a diene polymer (B), of which glass transition temperature (Tg) is neither the highest nor the lowest among the diene polymers each having content of ≥10% by mass with respect to the total mass of the diene polymers, has been modified by a compound containing silicon atom; the diene polymer (B) satisfies formula (i) shown below: St+Vi/2≤33  (i) (In the formula, “St” represents content of bonded styrene (mass %) of the diene polymer (B) and “Vi” represents vinyl bond content (mass %) of a conjugated diene compound part of the diene polymer (B)); and the silica has content of ≥25 parts by mass with respect to the total mass or 100 parts by mass of the diene polymers.