| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for manufacturing a mixed composition comprising a filler providing a colored product with a high lightness and containing uniformly dispersed fine fillers, without applying a mastication process as well as a method for manufacturing a vulcanized rubber using the composition SOLUTION: A natural rubber latex and a wet-ground calcium carbonate slurry are blended together in a vessel with an agitator. The rubber and calcium carbonate are coprecipitated from the mixture by adding an inorganic salt such as calcium nitrate, and then, the precipitate is coagulated, washed, dried, and vulcanized by kneading it with a vulcanizing agent, a vulcanization accelerator, etc., to form a vulcanized rubber.
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