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US 11,746,240 B2Granted
Interference pigments
AssigneeMerck Patent GmbH
InventorsStephanie Andes, Ulrich Schoenefeld, Thomas Krasemann, Manfred Thon, Martina Welsch, Ralf Schweinfurth, Melanie Mechthild Breidung
Life of this patent
Estimating the term…
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.
Claims18
Interference pigment based on a substrate mixture, wherein the substrate mixture consists of SiO2 flakes, which SiO2 flakes have at least 4 different thicknesses, and which SiO2 flakes are coated with at least one high-refractive-index layer.
Dependencies are inferred from the claim text.