| 摘要 |
The present invention provides a rubber composition comprising: (i) a rubber component comprising 70 to 90 % by weight of a styrene-butadiene copolymer rubber (A) containing 15 to 40 % by weight of a styrene content and 30 to 60 % by weight of a vinyl content in a butadiene portion, which is obtained by solution polymerization, and 10 to 30 % by weight of a polybutadiene rubber (B) (ii) a vulcanizing agent in an amount of 0.75 to 1.75 parts by weight based on 100 parts by weight of the rubber component (i) and (iii) a plasticizer; 20 to 26 % by weight of said rubber composition being extracted by acetone when a vulcanized rubber sample obtained from the rubber composition is subjected to a Soxhlet extractor for 24 hours, and at least 80 % by weight of the acetone extract being the plasticizer. |
