| 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 20 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; wherein the plasticizer is present in an amount such that the amount of acetone extract obtained by extracting a vulcanized rubber sample obtained from the rubber composition with a Soxhlet apparatus in an acetone solvent for 24 hours is 20 to 26% by weight of the vulcanized rubber sample, and at least 80% by weight of the acetone extract being the plasticizer.
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