Crosslinked rubber particles and rubber compositions

A rubber composition comprising

• A. at least one of(1) a crosslinked rubber particle comprising polymerized units of(a) 30 to 94.89% by weight of a conjugated diene unit, (b) 5 to 69.89% by weight of an aromatic vinyl unit, (c) 0.01 to 10% by weight of a monomer unit having at least two polymerizable unsaturated groups and (d) 0.1 to 30% by weight of a monomer unit having one polymerizable unsaturated group and at least one functional group selected from the group consisting of an amino group, a hydroxyl group and an epoxy group, wherein the crosslinked rubber particle has a particle size of 10 to 500 nm and a toluene-insolubles of 80% by weight or more;
• or
• (2) a crosslinked rubber particle comprising polymerized units of (a) 30 to 94.89% by weight of a conjugated diene unit, (b) 5 to 69.89% by weight of an aromatic vinyl unit, (c) 0.01 to 10% by weight of a monomer unit having at least two polymerizable unsaturated groups and (e) 0.1 to 30% by weight of a monomer unit having one polymerizable unsaturated group and a carboxylic group, wherein the total amount of (a), (b), (c) and (e) is 100% by weight and having a particle size of 10 to 500 nm and a toluene-insolubles of 80% by weight or more;
• and,
• B. a non-crosslinked rubber component having a toluene-insolubles of less than 20% by weight, wherein said non-crosslinked rubber component is at least one selected from the group consisting of (B 1) a polymer having only a conjugated diene unit as a repeating unit, (B2) a polymer which comprises as repeating units a conjugated diene unit and an aromatic vinyl unit and wherein the conjugated diene unit has a 1,4-trans content of 55% or less, (B3) a polymer comprising as repeating units a conjugated diene unit and an α,β-unsaturated nitrile unit, (B4) an acrylic rubber, and (B5) a polymer comprising as repeating units an ethylene unit and an α-olefin unit having 3 to 12 carbon atoms.