Multilayer pigments based on coated metal platelets

US6776835B2 · kind B2 · utility

Assignee

• Merck Patent GmbH · DE

Inventors

• Stephanie Andes · Hanau, DE
• Sabine George · Bensheim, DE
• Margarete Herbski · Ober-Ramstadt, DE
• Peter Reynders · Griesheim, DE
• Reiner Vogt · Darmstadt, DE
• Johann Dietz · Dietzenbach, DE
• Helge Kniess · Roßdorf, DE
• Elke Steudel · Darmstadt, DE

Key dates

• Filing date: Jun 4, 2003
• Grant date: Aug 17, 2004
• Expiry date: Jun 4, 2023

Classification

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

Abstract

The present invention relates to multilayer pigments based on platelet-shaped metal substrates coated with two or more metal oxide layers by a one-pot process in an exclusively aqueous medium. The invention further relates to the use of the multilayer pigments in paints, varnishes, printing inks, including security printing inks, plastics, ceramic materials and cosmetic and for the laser formulations marking of plastics.