| abstract |
PROBLEM TO BE SOLVED: To provide a conjugated diene rubber having a specific composition, an oil-extended rubber using the same, and a vulcanized rubber having low rolling resistance, excellent abrasion resistance, etc., and useful for tires and the like. The present invention provides a rubber composition which can be used. SOLUTION: An olefinically unsaturated nitrile monomer unit such as acrylonitrile is used as a repeating unit in an amount of 1 to 30. % By mass, and an aromatic vinyl monomer unit such as styrene 50% by mass, 19.9 to 88.9% by mass of a conjugated diene monomer unit such as 1,3-butadiene, and one polymerizable unsaturated group, an amino group, a hydroxyl group, an epoxy group, and a carboxyl group And a conjugated diene rubber and an oil-extended rubber having 0.1 to 10% by mass of a monomer unit having at least one functional group selected from an alkoxysilyl group and an alkoxysilyl group. Further, a rubber composition containing the conjugated diene rubber or oil-extended rubber and an inorganic filler such as silica is obtained. |