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

US7235298B2 · kind B2 · utility

Assignee

• Degussa AG · DE

Inventors

• Stipan Katusic · Bad Soden, DE
• Guenther Michael · Karlstein, DE
• Peter Kress · Alzenau, DE
• Guido Zimmermann · Hanau, DE
• Andreas Gutsch · Thedinghausen, DE
• Geoffrey Varga · Ellicott City, US

Key dates

• Filing date: Jul 7, 2003
• Grant date: Jun 26, 2007
• Expiry date: Oct 24, 2023

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/2996
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

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.