Flocculation-resistant, mixed phase pigments having a rutile structure, process for their preparation, and their use

US4450012A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Dieter Messer · Odenthal, DE
• Volker Wilhelm · Bensberg, DE
• Robert Endres · Verona, US
• Heinrich Heine · Krefeld, DE

Key dates

• Filing date: Sep 8, 1982
• Grant date: May 22, 1984
• Expiry date: Sep 8, 2002

Classification

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

Abstract

Coated rutile mixed phase pigments comprise a mixed phase rutile pigment having a first coating of an oxide or hydrated oxide of titanium, zirconium, tin or a mixture thereof and a subsequent coating of an oxide or hydroxide of aluminum, and those pigments exhibit an improved tendency against flocculation in lacquers hardened with acid catalysts.