Rubber composition

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PROBLEM TO BE SOLVED : To provide a rubber composition excellent in low heat generating property when made into vulcanized rubber, and excellent in adhesiveness to homogeneous or heterogeneous rubbers when made into vulcanized rubber. SOLUTION : There is provided a rubber composition containing 100 pts.mass of diene rubber containing polybutadiene rubber manufactured by using a rare earth element-based catalyst, 10 to 99 pts.mass of carbon black and 0.1 to 5.0 pts.mass of a dihydrazide compound. Preferably, 10 to 80 pts.mass of polybutadiene rubber is contained in 100 pts.mass of diene rubber. COPYRIGHT : (C)2015, JPO&INPIT