| abstract |
The present invention provides a crosslinked rubber composition having excellent processability, strength and homogeneity, a copolymer rubber suitable for a modifier for a resin, and a crosslinked rubber composition excellent in mechanical strength, abrasion resistance and the like. A copolymer rubber obtained by copolymerizing a raw material containing a polyfunctional vinyl aromatic copolymer (A), a conjugated diene compound (B) and an aromatic vinyl compound (C), wherein the polyfunctional vinyl aromatic copolymer (A) (A) derived from a compound, a structural unit (b) derived from a monovinyl aromatic compound, and a structural unit (d) constituting a terminal, wherein the structural unit (a) is contained in an amount of 2 to 95 mol% At least a part of the structural unit (a) is a vinyl group-containing structural unit (a1), and at least another part is a structural unit constituting the structural unit (d), and a number average molecular weight of 300 to 100000 Rubber. |