Color pigments

US5759257A · kind A · utility

Assignee

• Merck Patent GmbH · DE

Inventors

• Klaus Ambrosius · Frankfurt, DE
• Matthias Schraml-Marth · Zwingenberg, DE

Key dates

• Filing date: May 10, 1996
• Grant date: Jun 2, 1998
• Expiry date: May 10, 2016

Classification

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

Abstract

The present invention relates to color pigments based on substrates which are coated with a doped layer of iron(III) oxide, to processes for their preparation and to their use, especially in aqueous coating systems.