Dispersion containing titanium dioxide

US7780777B2 · kind B2 · utility

Assignee

• EVONIK DEGUSSA GMBH · DE

Inventors

• Gabriele Perlet · Großkrotzenburg, DE
• Wolfgang Lortz · Wächtersbach, DE
• Christoph Batz-Sohn · Hanau, DE
• Werner Will · Gelnhausen, DE
• Sascha Reitz · Hanau, DE

Key dates

• Filing date: Jul 5, 2005
• Grant date: Aug 24, 2010
• Expiry date: Apr 23, 2027

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B2111/60
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

An aqueous dispersion that can be used in the coating of glass, ceramics and metal surfaces is prepared by placing, in water, an aggregated titanium dioxide powder having a specific surface area of from 20 to 150 m2/g in such an amount that the desired dispersion contains at least 20 wt. % titanium dioxide, and at least one amino alcohol having from 1 to 6 carbon atoms, and at least one carboxylic acid selected from dibasic carboxylic acids and/or hydroxycarboxylic acids having from 2 to 6 carbon atoms. A pre-dispersion is produced by introducing energy in an amount of less than 200 kJ/m3. Then a dispersion is produced in which the aggregated titanium dioxide powder has a mean, volume-related aggregate diameter of less than 150 nm by grinding the pre-dispersion with a high-energy mill at a pressure of at least 500 bar.