COPOLYMER, RUBBER COMPOSITION USING SAME, AND TIRE

摘要

A random copolymer contains monomer units (a) derived from an aromatic vinyl compound and monomer units (b) derived from farnesene. A method for producing the aforementioned copolymer involving copolymerization of at least an aromatic vinyl compound and farnesene. A rubber composition contains the copolymer (A), a rubber component (B) and carbon black (C). A rubber composition contains the copolymer (A), a rubber component (B) and silica (D), and another rubber composition contains the copolymer (A), a rubber component (B), carbon black (C) and silica (D). A tire has at least one part where the rubber composition is used.