A method for producing natural rubber composition

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PROBLEM TO BE SOLVED : To provide a natural rubber composition appropriately adjusting a viscosity of the natural rubber composition by a simple kneading method without increasing the number of kneading step and enhancing carbon black dispersibility. SOLUTION : In the manufacturing method for the natural rubber composition, the rubber composition containing 20-120 pts.wt. of carbon black and/or silica at its total amount based on 100 pts.wt. of natural rubber is manufactured. At the first kneading step, a formulated compound in which 15-30 pts.wt. of carbon black and/or silica and 2-20 pts.wt. of zinc oxide are added to 100 pts.wt. of natural rubber is kneaded, and at the second kneading step, the residual amount of carbon black and/or silica and the formulation agent other than a vulcanization system are added/kneaded to the rubber mixture obtained at the first step. At the third kneading step, the rubber mixture obtained at the second step is re-kneaded, and at the fourth kneading step, a vulcanization system formulation agent is added/kneaded to the rubber mixture obtained in the third step. COPYRIGHT : (C)2008, JPO&INPIT