| abstract |
A copolymer containing an isoprene-derived monomer unit (a) and a parnesene-derived monomer unit (b). Wherein at least a copolymer of isoprene and parnesene is produced. A rubber composition comprising the copolymer (A), the rubber component (B) and the carbon black (C). A rubber composition comprising the copolymer (A), the rubber component (B) and the silica (D). A rubber composition comprising the copolymer (A), the rubber component (B), the carbon black (C) and the silica (D). A tire using at least a part of the rubber composition. |