| 摘要 |
A rubber composition containing (A) an ethylene-alpha-olefin based copolymer rubber having an intrinsic viscosity [eta] of 2.0-10.0 as determined in xylene at 70° C., (B) a softening agent, and (C) a filler, which composition is superior in heat resistance and fatigue resistance, is obtained by a process including the steps of dividing component (A) into portions (A1) and (A2), dividing component (B) into portions (B1) and (B2), dividing component (C) into portions (C1) and (C2), kneading portions (A1), (B1) and (C1) together to obtain a first blend, adding portions (A2), (B2) and (C2) to the first blend to obtain a second blend and kneading the second blend to obtain the rubber composition.
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