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US 4,065,426 AGranted
Method for the preparation of powdered rubber
AssigneeMitsubishi Chemical Industries Limited
InventorsTakeshi Yamawaki, Takanori Uchida, Makoto Nakajima
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Abstract
Rubber crumbs are imparted with non-tackiness or antiblocking property by treating the crumbs with a mixture of a rubber latex and an aqueous carbon black slurry in the presence of a coagulant.
Claims13
A method for preparing powdered rubber comprising the steps of:
- (a) adding a coagulant to a rubber latex to obtain crumbs of the rubber (b) mixing said crumbs with a rubber latex and an aqueous carbon black slurry in an amount of 100 - 1000 parts by weight of carbon black per 100 parts by weight of the rubber component in the second-mentioned rubber latex;
- said weight of rubber component in the second conventional rubber latex being 0.5 - 50 wt. % of the rubber component of said crumbs from set (a), (c) treating the resulting mixture in the presence of a coagulant;
- and (d) separating the thus treated crumbs from the serum and drying the separated crumbs.
Dependencies are inferred from the claim text.