Dow Global Technolgoies LLC

Nutrition & Biosciences USA 1, LLC

Marco Grossstueck

Juergen Hermanns

Yvonne M Goerlach-Doht

Meinolf Brackhagen

Hartwig Schlesiger

Peter E Pierini

Martin Kowollik

Michael Schreck

Jan Zillmann

A particulate cellulose derivative is obtained in a process of grinding and drying a moist cellulose derivative wherein The obtained particulate cellulose derivative has a high untapped bulk density and a good flowability.

Process for producing cellulose derivatives of high bulk density and good flowability

A particulate cellulose derivative is obtained in a process of grinding and drying a moist cellulose derivative which comprises the steps of A) providing a cellulose derivative having a moisture content of from 60 to 95 percent, based on the total weight of the moist cellulose derivative, B) grinding and partially drying the moist cellulose derivative in a gas-swept impact mill; and C) contacting the ground and partially dried cellulose derivative with an additional amount of a drying gas outside the gas-swept impact mill. The obtained particulate cellulose derivative has a high untapped bulk density and a good flowability.

Process for producing cellulose derivatives of high bulk density, good flowability and improved dispersibility in cold water

The present invention relates to a process for the preparation of a water-moist cellulose ether composition, characterized in that water-soluble polymeric additives which contain anionic groups (WSAP), or corresponding additive mixtures, are added to the cellulose ether composition. The invention furthermore relates to water-moist cellulose ether compositions which can be prepared by such a process, and to corresponding milled and dried cellulose ether compositions. The invention also relates to the use of these WSAP or corresponding WSAP mixtures for improving the transportability of water-moist cellulose ether compositions in conveying units.

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Walsrode, Germany

Marco Grossstueck