Nanoscale zinc oxide, process for its production and use

US7718261B2 · kind B2 · utility

Assignee

• EVONIK DEGUSSA GMBH · DE

Inventors

• Stipan Katusic · Bad Soden, DE
• Gunther Michael · Karlstein, DE
• Peter Kress · Alzenau, DE
• Geoffrey Varga · Ellicott City, US
• Edwin Staab · Geiselbach, DE
• Winfried Weber · Haag in Oberbayern, DE

Key dates

• Filing date: Mar 10, 2003
• Grant date: May 18, 2010
• Expiry date: Oct 2, 2027

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/2982
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

Nanoscale, pyrogenically produced zinc oxide having a BET surface area of 10 to 200 m2/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.