Glass-stable colored pigments

US5106419A · kind A · utility

Assignee

• Merck Patent GmbH · DE

Inventors

• Wolfgang Hechler · Herbstein, DE
• Karl Osterried · Dieburg, DE
• Manfred Weigand · Weiterstadt, DE

Key dates

• Filing date: Mar 7, 1991
• Grant date: Apr 21, 1992
• Expiry date: Mar 7, 2011

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09C2200/401
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Colored pigments having an improved stability in decorative colors, engobes, glazes, and enamels, based on platelet-type substrates coated with metal oxides, in which the coating is free from alkaline earth metal oxides and contains a colored metal oxide or metal hydroxide and at least 10% by weight of aluminum oxide, are outstandingly suitable for pigmenting glazes and enamels.