Effect pigments based on thin SiO2 flakes
AssigneeMerck Patent GmbH
InventorsGerhard Pfaff, Doreen Warthe, Johann Dietz, Cornelia Foerderer
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Abstract
Effect pigments having improved optical properties based on SiO2 flakes coated with one or more layers, where the SiO2 flakes have a thickness of from 50 nm to 150 nm; processes for the preparation thereof; and use of these pigments in cosmetics, paints, coatings, plastics, films, in security printing, in security features in documents and identity cards, for coloring seed, for coloring foods or in medicament coatings and for the preparation of pigment compositions and dry preparations; are disclosed.
Claims12
An effect pigment which is a silver-white effect pigment, a colored interference pigment or an effect pigment having a non-flake appearance comprising an SiO2 flake substrate having a thickness of from 50 nm to 150 nm, coated with only one layer of a metal oxide, metal oxide hydrate, metal suboxide, or metal fluoride or only one layer of a mixture of two or more of these materials.
Dependencies are inferred from the claim text.