Particles comprising an anion-binding layer containing anion-forming organic active compounds, and method of making and using thereof
AssigneeMerck Patent GmbH
InventorsCarsten Handrosch, Thomas Rudolph, Herwig Buchholz, Soheila Anzali
Life of this patent
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Abstract
Disclosed are particles containing substrates and an anion-binding layer, containing one or more anion-forming organic active compounds or active compound/colorant mixtures; processes for preparing said particles and to methods of use thereof in cosmetics, pharmaceuticals, formulations, paints, coatings, plastics, films, in security printing, in security features in documents or identity papers, for coloring seed, for coloring foods or in medicament coatings and for the preparation of pigment compositions and dry preparations.
Claims23
A particle comprising a substrate and coated thereon an anion-binding layer which comprises one or more anion-forming organic active compounds, wherein at least one of the one or more anion-forming organic active compounds is not an anionic or anion-forming dye,
- wherein one or more transparent, semitransparent and/or opaque layers of metal oxides, metal oxide hydrates, metal suboxides, metals, metal fluorides, metal nitrides, metal oxynitrides or a mixture thereof has been applied to the substrate beneath the anion-binding layer, or
- wherein the substrate is flake-form shaped and is selected from the group consisting of glass flakes, SiO2 flakes Al2O3 flakes, BiOCI flakes, graphite flakes, synthetic and natural flake-form iron oxide and flake-form metals, and aluminium, titanium, bronze, steel and silver metal flakes, wherein the metal flakes are optionally passivated, or
- wherein the substrate is flake-form shaped and has a diameter of 5 to 200 μm, an average thickness of 0.05 to 10 μm, and an average aspect ratio of 5 to 750.
Dependencies are inferred from the claim text.