Degussa Aktiengesellschaft

Evonik Degussa Gmbh

Geoffrey J Varga

Stipan Katusic

Peter Kress

Günther Michael

Guido Zimmermann

Guenther Michael

Edwin Staab

Andreas Gutsch

Winfried Weber

Nanoscale, pyrogenically produced zinc oxide having a BET surface area of 10 to 200 m/g, which is in the form of aggregates of anisotropic primary particles and whereby the aggregates display an average diameter of 50 to 300 nm. It is obtained from zinc powder, which is converted to zinc oxide powder in the four successive reaction zones, evaporation zone, nucleation zone, oxidation zone and quench zone. It can be used in sunscreen formulations.

Nanoscale zinc oxide, process for its production and use

Pyrogenically prepared, doped zinc oxide powder, wherein the doping component comprises at least one oxide from the group aluminum, gallium, indium, germanium, tin and is present in the doped zinc oxide powder in an amount of from 0.005 to 15 wt. %, and wherein the doped zinc oxide powder is in the form of aggregates of primary particles having a mean maximum diameter of from 30 to 400 nm. It is prepared by oxidation from zinc powder and at least one doping agent, wherein the process zones vaporisation, nucleation, oxidation and quenching are passed through and the doping agent is metered in in the nucleation zone, in which the temperature is below the boiling temperature of zinc. The doped zinc oxide powder can be used in electrically conductive lacquers and coatings.

Doped zinc oxide powder, process for its preparation, and its use

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Freigericht, Germany

Geoffrey J Varga