Bayer Aktiengesellschaft

Bayer Akteingesellschaft

Pol Bamelis

Christian Lindner

Otto Koch

Dieter Wittmann

Hans-Eberhard Braese

Jurgen Hinz

Gabriel Denecker

Domien Sluyts

Tony Van Osselaer

Burkhard Braun

Edwin Roth

Jan De Roos

Jean-Marie Biot

A process for the preparation of polymer powders from polymer dispersions by feeding a polymer dispersion continuously into an atomization apparatus and separately therefrom but at the same time also introducing a liquid agent, the dispersion and the liquid agent being completely mixed within at the most one second and the mixture being immediately thereafter dried with evaporation of the volatile constituents to form a powder composed of particles having an average diameter of from 0.05 to 1 mm, and the polymer powders prepared by this process.

Process for the preparation of polymer powders by spray drying

The invention relates to a process for the recovery of thermoplastic polymers from aqueous dispersions by spray-drying after treatment with carboxylic acid of formula I ##STR1## wherein X is a single bond, --CH.sub.2 -- or --C.sub.2 H.sub.4 --, and

Processing of polymer dispersions by spray drying

An improved work-up of aqueous mother liquors which originate from the oxidative preparation of benzothiazolylsulphenamides and which contain unreacted amine or a low-boiling alcohol employed as solubilizer, or both, the work-up being carried out in such a fashion that the mother liquor is saturated by additives until two phases form, the phases are separated from one another, the aqueous phase is extracted with further alcohol or amine, amine, alcohol and the extracted components are isolated from the combined organic phases, and amine or alcohol dissolved in the aqueous phase is removed therefrom by distillation.

Process for the work-up of the mother liquors from the preparation of

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Bergisch Gladbach, Germany

Pol Bamelis