| abstract |
copolymer, its production process, rubber and tire compositions. the present invention relates to a copolymer containing monomeric units (a) derived from a conjugated diene having 12 or less carbon atoms and monomeric units (b) derived from farnesene. a method for producing the aforementioned copolymer which involves copolymerizing at least conjugated dienes having 12 or less carbon atoms and farnesene. a rubber composition contains copolymer (a), a rubber component (b) and carbon black (c). a rubber composition contains copolymer (a), a rubber component (b) and silica (d). a rubber composition contains copolymer (a), a rubber component (b), carbon black (c) and silica (d). a tire has at least one part where the rubber compound is used. |