Iridescent pigment having high brilliance and high chroma
AssigneeMerck Patent GmbH
InventorTamio Noguchi
Life of this patent
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Abstract
An iridescent multilayer pigment having at least two or more layers of metal oxides containing one or more metals selected from Ce, Sn, Ti, Fe, Zn and Zr which are coated onto the surface of thin platelet-like substrates. The inventive pigments show high brilliance and high chroma, in particular in cases in which thin platelet-like substrates having a fine average particle diameter are used. The pigment is useful in paints, printing inks, lacquers, plastics, dopants for laser marking, non-dusting pigment products, non-dusting pigment granules or cosmetics.
Claims26
An iridescent pigment comprising a platelet shaped substrate and coated thereon at least two layers of metal oxides, each of said metal oxide layers comprising one or more metals selected from the group consisting of Ce, Sn, Ti, Fe, Zn and Zr.
A method for preparing an iridescent pigment comprising preparing a suspension, said suspension comprising platelet shaped substrates and one or more water-soluble polymers and/or water-soluble nitrogen compounds, followed by coating a metal hydrate layer onto the surface of the substrates by adding one or more metal salts and a basic aqueous solution to said suspension.
Dependencies are inferred from the claim text.