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US 2022/0162449 A1Published application
Deep bluish-black effect pigments
AssigneeMerck Patent GmbH
InventorsFumiko SASAKI, Kirsten FRITSCHE, Masayuki MOMOSE, Michael JUNGNITZ
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Abstract
The present invention is related to effect pigments exhibiting a deep black body color as well as a blue interference color, to a process for the production of such pigments as well as to the use thereof, especially in coating compositions.
Claims19
Deep bluish-black effect pigments, each pigment comprising
- a synthetically produced transparent dielectric flake-form substrate which has per se a green interference color and a refractive index n of greater than 1.5, and
- at least a layered structure consisting of
- a first layer composed of hematite and/or goethite, and
- a second layer composed of magnetite,
- on the flake-form substrate, wherein the second layer is located on top of the first layer and the first layer is located directly on the substrate.
2 more elements
Dependencies are inferred from the claim text.