Huels Aktiengesellschaft

Huls Aktiengesellschaft

Hans-Juergen Smigerski

Uwe Ernst

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 method of processing finely divided solids which have precipitated or separated out in a liquid. The suspended finely divided solid is converted into a pourable powder with negligible dust content and narrow particle size distribution, without detrimental particle alteration. The suspension is charged into a centrifuge, which may be a reversible-filter centrifuge. The solids are preferably centrifuged at a centrifugal pressure of 0.05-0.5 MPa for 0.5-5 min, and are then gently removed from the centrifuge, to be dried gently in a vibrating fluidized-bed dryer. The method is particularly suitable for processing precipitated synthetic rubbers (which may contain fillers as well) into a pourable powder which retains pourability after storage.

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Marl, Germany

Hans-Juergen Smigerski