| 摘要 |
PURPOSE:To produce a granular rubber having excellent kneading dispersibility a nd processability, in high efficiency at a low cost, by crushing a porous unvulcanized rubber having a specific bulk density in the presence of a resinforcing filler. CONSTITUTION:100pts.(wt.) of a porous unvulcanized rubber having a bulk density of 0.01-0.7, preferably 0.1-0.5 (preferably a natural rubber or a synthetic rubber having unsaturated bond in the main chain, e.g. isobutene-isoprene rubber, etc.) is mixed with preferably 10-60pts. of a reinforcing filler (preferably carbon black) and the mixture is crushed with a small-sized crusher preferably at room temperature to obtain the objective granular rubber.
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