Interference pigments with great color strength
AssigneeMerck Patent GmbH
InventorsChristoph Schmidt, Klaus Bernhardt, Sabine Schoen, Dieter Heinz
Life of this patent
Estimating the term…
Abstract
The invention relates to interference pigments with a great color strength that are based on multicoated platelet-shaped substrates that have at least one series of layers from (A) a highly refractive coating that consists of a mixture of TiO2 and Fe2O3 in ratio of 1:0.1 to 1:5 and optionally one or more metal oxides in amounts of ≦20% by weight based on layer (A), (B) a colorless coating with a refractive index n≦1.8, (C) a colorless coating with a refractive index of n 1.8, (D) an absorptive coating with a refractive index of n 1.8, and optionally (E) an outer protective layer.
Claims16
Intensely coloured interference pigments based on multicoated platelet-shaped substrates which comprise at least one layer sequence comprising
- (A) a high-refractive-index coating consisting of a mixture of TiO2 and Fe2O3 in a ratio of from 1:0.1 to 1:5, and optionally one or more mental oxides in amounts of ≦20% by weight, based on the layer (A),
- (B) a colourless coating having a refractive index n of ≦1.8,
- (C) a colourless coating having a refractive index n of >1.8,
- (D) an absorbent coating having a refractive index of n of >1.8 and optionally
- (E) an outer protective layer.
Dependencies are inferred from the claim text.