| 摘要 |
PROBLEM TO BE SOLVED: To provide a rubber composition having excellent extrusion processability and durability, and suitable for the inner tube of a rubber hose. SOLUTION: This rubber composition is obtained by compounding (a) 1-30 pts.wt. syndiotactic 1,2-polybutadiene (SPB) having 0.1-4 reduced viscosity, and (b) 30-70 pts.wt. inorganic filler with 100 pts.wt. vulcanizable rubber, and can provide a rubber having 55-80 hardness measured by type A of JIS K6253.
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