Stabilizing titanium dioxide pigments with vanadates

US4179306A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

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

Key dates

• Filing date: Jun 8, 1978
• Grant date: Dec 18, 1979
• Expiry date: Jun 8, 1998

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01P2006/60
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A process for the production of a light-stable and weather-stable titanium dioxide pigment comprising precipitating onto the pigment in aqueous suspension a colorless vanadate of at least one of zinc, magnesium, calcium, strontium and barium at a pH-value above 7 in about 0.01 to 5% by weight, expressed as V.sub.2 O.sub.5, based on TiO.sub.2. Advantageously the pigment either before or after precipitation of the vanadate is coated with at least one oxide, oxide hydrate or phosphate of titanium, silicon, aluminum or zirconium.