Huls Aktiengesellschaft

Uwe Ernst

Hans-Jurgen Smigerski

Hans-Juergen Smigerski

Process for producing pourable powdered rubber with filler content independent of particle size. By adjusting to a pH in the range of 3.7 to 6.5 after the mixing of rubber latices or aqueous emulsions of rubber solutions with filler suspensions containing precipitant, and by using 0.1 to 2.0 phr of a selected metal salt, powdered rubbers can be produced with filler content independent of particle size.

Process for producing pourable powered rubber containing filler

A process for preparing a pourable powdered rubber containing filler, comprising preparing a blend by mixing a portion of said filler to be incorporated in said rubber product with 0.1 to 6.5 phr of a water-soluble salt of a Group IIa, IIb, IIIa or VIII metal of the Periodic Table and a rubber latex or aqueous emulsion of a rubber solution, adjusting the pH of the blend to a pH ranging from 3.2 to 8.6 by addition of an acid, adding the remaining amount of filler to the pH adjusted blend, separating the rubber containing filler from the aqueous phase of the blend, and drying the powdered rubber product obtained.

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Borken, Germany

Uwe Ernst