Intensely colored interference pigments
AssigneeMerck Patent GmbH
InventorsSabine Schoen, Klaus Bernhardt, Christoph Schmidt
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Abstract
The invention relates to intensely colored interference pigments based on multi-layered plate-like substrates with at least two sequences of layers consisting of (A) a colorless layer with a refraction index n≦1,8; (B) a high-index layer consisting of a mixture of TiO2 and Fe2O3 in a ratio of 1:0.1 to 1:5 and optionally, one or more metal oxides in quantities of to layer (B); and optionally (C) an outer protective layer.
Claims20
An interference pigment comprising a multicoated platelet-shaped substrate having at least one two layer sequence comprising:
- (A) a colorless coating having a refractive index, n, of ≦1.8, and
- (B) a high-refractive-index coating consisting of a mixture of TiO2 and Fe2O3 in a weight ratio of from 1:0.1 to 1:5, and one or more metal oxides selected from Al2O3, Ce2O3, ZrO2, SnO2 and/or B2O3, in an amount up to 20% by weight, based on the total weight of layer (B),
- and optionally
- (C) an outer protective layer.
An interference pigment comprising a multicoated platelet-shaped substrate having only one two layer sequence (A)+(B):
- (A) a colorless coating having a refractive index, n, of ≦1.8, and
- (B) a high-refractive-index coating consisting of a mixture of TiO2 and Fe2O3 in a weight ratio of from 1:0.1 to 1:5, and, optionally, one or more other metal oxides in an amount ≦20% by weight, based on the total weight of layer (B),
- and optionally
- (C) an outer protective layer.
Dependencies are inferred from the claim text.