Surface-modified platelet-like pigments

US5221341A · kind A · utility

Assignee

• Merck Patent GmbH · DE

Inventors

• Klaus-Dieter Franz · Kelkheim, DE
• Johann Dietz · Dietzenbach, DE
• Manfred Kieser · Darmstadt, DE

Key dates

• Filing date: Jun 26, 1992
• Grant date: Jun 22, 1993
• Expiry date: Jun 26, 2012

Classification

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

Abstract

The invention relates to surface-modified platelet-like pigments based on platelet-like substrates which are coated with a titanium dioxide layer and a thin alkaline earth metal titanate film on top of it, in which the pigment, in order to increase the photostability and to decrease the surface reactivity towards organic compounds, is ignited at temperatures of at least 800.degree. C.