| 摘要 |
PROBLEM TO BE SOLVED: To provide a polymer for obtaining a crosslinked rubber composition improved in durability (fracture resistance and abrasion resistance), as well as a producing method thereof, a rubber composition containing the polymer, and a tire having the rubber composition.SOLUTION: A polymer is a synthetic polyisoprene or an isoprene copolymer, and the number average molecular weight (Mn) by gel permeation chromatography (GPC) measurement is 1,500,000 or more. |
