| abstract |
The object of the present invention is a process for the production of a rubber powder, which consists in mixing one or more organosilicon compounds containing at least one alkoxy group dissolved in water or emulsified, optionally in the presence of a surfactant, or directly admixing said surfactant. by mixing with an aqueous suspension of powdered oxide or silicate filler or a mixture of these fillers at a temperature of 10 to 60 ° C., wherein the amount of the mixture to be incorporated into the rubber, based on the filler content, is divided into two parts and the first part mixed with the polymer. with a latex, a polymer emulsion or a polymer solution, and the pH of the mixture obtained is reduced by acid to a pH of 6.0 to 4.5, and the remaining second portion is added while further reducing the pH to 4.5 to 2.6, found in the mixture together with the filler modified with organokrivy The precipitated solid is separated and the rubber-containing filler is dried. The invention also relates to rubber powders produced in this way. |