Patent ID: 8222337

Claim:
A rubber composition formed by compounding a non-compatible polymer blend, which comprises at least two rubber components and forms a polymer phase A and a polymer phase B, with a block copolymer comprising a block-a composed of the same monomer unit as a monomer unit forming the polymer phase A and a block-b composed of the same monomer unit as a monomer unit forming the polymer phase B, wherein at least one of the rubber components has at least one functional group selected from the group consisting of a silicon-containing functional group, a tin-containing functional group, an imidazole group, a pyridyl group, an amino group, an imino group, an ammonium group, an imide group, a hydrazo group, an azo group, a diazo group, a hydroxyl group, an epoxy group, an oxycarbonyl group, a sulfide group, a disulfide group, a sulfonyl group, a sulfinyl group, a thiocarbonyl group, a nitrogen-containing heterocyclic group, an oxygen-containing heterocyclic group, and an alkoxysilyl group.