Interference pigments

US11746240B2 · kind B2 · utility

Assignee

• Merck Patent GmbH · DE

Inventors

• Stephanie Andes · Hanau, DE
• Ulrich Schoenefeld · Bickenbach, DE
• Thomas KRASEMANN · Darmstadt, DE
• Manfred Thon · Darmstadt, DE
• Martina Welsch · Darmstadt, DE
• Ralf Schweinfurth · Darmstadt, DE
• Melanie Mechthild Breidung · Wilmington, US

Key dates

• Filing date: Sep 25, 2020
• Grant date: Sep 5, 2023
• Expiry date: Sep 25, 2040

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09C2200/301
• WIPO field: Food chemistry
• WIPO sector: Chemistry

Abstract

The invention relates to interference pigments based on SiO2 flakes having a broad layer-thickness distribution, and to the use thereof in paints, coatings, powder coatings, plastics and in particular in cosmetic formulations and for colouring food and pharmaceutical products.