Pearl luster pigments stable to glaze and enamel

US5022923A · kind A · utility

Assignee

• Merck Patent GmbH · DE

Inventors

• Axel Rau · Pfullendorf, DE
• Klaus Ambrosius · Frankfurt, DE
• Klaus-Dieter Franz · Kelkheim, DE

Key dates

• Filing date: Oct 8, 1986
• Grant date: Jun 11, 1991
• Expiry date: Oct 8, 2006

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09C2220/106
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Pearl luster pigments based on mica flakes coated with metal oxides are provided with a top coating of tin dioxide and/or cerium dioxide to improve their stability in glazes and enamels.