Silver-colored luster pigment
AssigneeMerck Patent GmbH
InventorsChristoph Schmidt, Andrea Heyland, Claudia Fornoff, Hans-Dieter Bruckner
Life of this patent
Estimating the term…
Abstract
The present invention relates to silver-colored luster pigments based on multiply coated platelet-shaped substrates, which has at least one layer sequence of TiO2, a colorless coating and another TiO2 layer. The pigment can optionally have an outer protective layer. These luster pigments are useful and to the use thereof in paints, coatings, printing inks, including security printing inks, plastics, ceramic materials, glasses, cosmetic formulations and for producing pigment preparations and dry product forms such as granules, chips, pellets and briquettes.
Claims22
A silver-colored luster pigment comprising a multiply coated platelet-shaped substrate and at least one layer sequence of
- layer (A) a high refractive coating consisting of TiO2 which has a thickness of 5-200 nm,
- layer (B) a colorless coating having a refractive index n≦1.8 and a thickness of 10-300 nm, and
- layer (C) a high refractive coating consisting of TiO2 which has a thickness of 5-200 nm,
- and optionally
- layer (D) an outer, protective layer.
Dependencies are inferred from the claim text.