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US 6,548,584 B1Granted
Pulverulent rubber powder containing filler, process of the production thereof and use thereof
AssigneePKU Pulverkautschuk Union GmbH
InventorsUdo Görl, Reinhard Stober, Hartmut Lauer, Uwe Ernst
Life of this patent
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Abstract
Pulverulent rubber powder containing filler which remains free-flowing even after exposure to mechanical stresses, a process for the production thereof, in which the rubber powder is obtained in two precipitation steps, and the use of these powders for the production of vulcanizable rubber compounds.
Claims11
A process for the production of finely divided, pulverulent rubber powder containing filler, comprising:
- a) mixing ≧50 wt. % of a filler with:
- (i) 0.1 to 6.5 parts by weight of water-soluble salts per 100 parts by weight of rubber, and
- (ii) a rubber latex or an aqueous emulsion of a rubber solution,
- b) reducing the pH value of the mixture formed in step a) to a value in the range from 5.5 to 4.5,
- c) adding the remainder of the filler as a filler suspension, and
- d) reducing the pH value to approximately 3.2 causing the precipitation of the rubber and the filler,
- wherein the filler suspension comprises water-soluble salts of a metal selected from group IIa, IIb, IIIa or VIII of the periodic table of elements.
4 more elements
Dependencies are inferred from the claim text.