Process for the production of titanium dioxide pigments with high weather resistance

US4328040A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Peter Panek · Castlecomer, IE
• Peter Woditsch · Krefeld, DE
• Eckhard Bayer · Krefeld, DE
• Heribert Stutgens · Krefeld, DE

Key dates

• Filing date: Sep 8, 1980
• Grant date: May 4, 1982
• Expiry date: Sep 8, 2000

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01P2004/84
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

The production of titanium dioxide pigments with improved chalking resistance and gloss retention by coating with an oxide and/or phosphate of zirconium and of titanium, aluminum and/or silicon, the improvement which comprises coating with zirconium by adding to an aqueous alkaline suspension of the titanium dioxide pigment of alkali metal or ammonium zirconium carbonate complex and slowly precipitating the zirconium by adding a dissolved compound of at least one of titanium, aluminum, silicon and phosphorus.