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US 5,607,504 AGranted
Multiply coated metallic luster pigments
AssigneeBASF SE
InventorsRaimund Schmid, Norbert Mronga
Life of this patent
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Abstract
Luster pigments based on multiply coated plateletlike metallic substrates comprise at least one layer packet comprising A) a colorless coating having a refractive index n.ltoreq.1.8, and B) a selectively absorbing coating having a refractive index n.gtoreq.2.0 and also if desired additionally C) an outer, colorless or selectively absorbing coating different than the layer (B) underneath.
Claims9
Luster pigments based on multiply coated platelet-shaped metallic substrates with at least one layer packet comprising
- A) a first colorless coating having a refractive index n.ltoreq.1.8, and
- B) a second selectively absorbing coating having a refractive index n.ltoreq.2.0, applied upon said first coating,
- and optionally
- C) a third, outer, colorless or selectively absorbing coating different from said second coating and applied upon said second coating, and wherein coating (B) consists essentially of selectively absorbing oxides selected from the group consisting of iron (III) oxide, chromium (III) oxide, vanadium (V) oxide, titanium (III) oxide or mixtures thereof, or of colorless oxides selected from the group consisting of titanium dioxide, zirconium oxide or mixtures thereof, which have been colored with the aid of selectively absorbing colorants.
1 more element
Dependencies are inferred from the claim text.