Wacker Chemie Ag

Jochen Ring

Stefan Killat

Michael Herbert

Bernd Gerstenberger

A process for producing dispersible powders by spray-drying aqueous polymer dispersions and adding antiblocking agent, wherein antiblocking agents present in agglomerated form and having a particle size from 10 &#x3bc;m to 250 &#x3bc;m, or having a particle size from 5 mm to 5 cm in the case of agglomerates in the form of extrudates, are fed in whole or in part by a transport gas into the spray-drying device and are comminuted to a particle size from 0.01 &#x3bc;m to 5 &#x3bc;m, or, in the case of extrudates, to a particle size from 2 &#x3bc;m to 60 &#x3bc;m.

Process for producing dispersible powders

A process for producing dispersion powders by spray drying of aqueous polymer dispersions and addition of antiblocking agents in a rotary atomization dryer, wherein the antiblocking agent is conveyed by delivery air, wholly or partly, into an annular gap which is formed by a moulding arranged concentrically around the housing of the rotary atomizer, and which ends at a distance above the upper edge of the atomizer plate of the rotary atomizer.

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Herxheim, Germany

Jochen Ring