Effect pigments

US11459469B2 · kind B2 · utility

Assignee

• Merck Patent GmbH · DE

Inventors

• Sabine Schoen · Darmstadt, DE
• Michael Jungnitz · Frankfurt, DE
• Stefan Schlueter · Pickenbach, DE
• Kirsten Fritsche · Darmstadt, DE
• Carsten Plueg · Bremke, DE
• Stephanie Andes · Hanau, DE
• Ulrich Schoenefeld · Bickenbach, DE

Key dates

• Filing date: Dec 19, 2018
• Grant date: Oct 4, 2022
• Expiry date: Dec 19, 2038

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09D7/61
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Effect pigments based on Al2O3 flakes with high weather resistance and less photoactivity and to their use thereof in paints, industrial coatings, automotive coatings, printing inks, cosmetic formulations. The effect pigments have a ratio of the amount by weight of Al2O3 of the Al2O3 flake and the amount by weight of the metal oxide(s) of the coating layer(s) in the range of from 27:73 to 83:17 based on the total weight of the effect pigment.