Multilayer pigments based on glass flakes
AssigneeMerck Patent GmbH
InventorsKlaus Ambrosius, Ralf Anselmann, Sabine Schoen
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Abstract
The present invention relates to multilayer pigments based on glass flakes and to a method for the production of such pigments. The resulting pigment can be used in any application for which pearlescent pigments have been heretofore used such as, for example, in plastics, paints, inks, cosmetic formulations, coatings including solvent or waterborne automotive paint systems, powder coatings, inks and agriculture foils, for the laser-marking of papers and plastics.
Claims22
Multilayer pigments based on glass flakes comprising glass flakes having a thickness of less than 1 μm which are coated with at least one sequence of layers
- (A) a coating having a refractive index n>1.8
- (B) a coating having a refractive index n<1.8 and
- (C) a coating having a refractive index n>1.8, and optionally,
- (D) an outer protective layer
- with the proviso that the layer packet (A)+(B) may be present in the layer sequence (A)+(B)+(C) up to four times,
- wherein the layers comprise a metal oxide, metal suboxide, metal fluoride, metal oxyhalide, metal chalcogenide, metal sulfide, metal nitride, metal oxynitride, or a metal carbide, or a mixture thereof.
Multilayer pigments based on glass flakes comprising glass flakes having a thickness of less than 1 μm which are coated to have one of the following layer structures:
- glass flakes
- + TiO2
- + SiO2
- + TiO2
- glass flakes
- + TiO2
- + SiO2
- + Fe2O3
- glass flakes
- + TiO2
- + SiO2
- + TiO2/Fe2O3
- glass flakes
- + TiO2
- + SiO2
- + (Sn,Sb)O2
- glass flakes
- + (Sn,Sb)O2
- + SiO2
- + TiO2
- glass flakes
- + Fe2O3
- + SiO2
- + (Sn,Sb)O2
- glass flakes
- + TiO2/Fe2O3
- + SiO2
- + TiO2/Fe2O3
- glass flakes
- + TiO2
- + SiO2
- + MoS2
- glass flakes
- + TIO2
- + SiO2
- + Cr2O3
- glass flakes
- + Cr2O3
- + SiO2
- + TiO2
- glass flakes
- + Fe2O3
- + SiO2
- + TiO2
- glass flakes
- + TiO2
- + Al2O3
- + TiO2
- glass flakes
- + Fe2TiO5
- + SiO2
- + TiO2
- glass flakes
- + TiO2
- + SiO2
- + Fe2TiO5/TiO2
- glass flakes
- + TiO
- + SiO2
- + TiO2 suboxides
- suboxides
- glass flakes
- + TiO2
- + SiO2
- + TiO2 + SiO2 + TiO2+
- Prussian Blu
- glass flakes
- + TiO2
- + SiO2
- + TiO2 + SiO2 + TiO2
- glass flakes
- + TiO2 +
- + SiO2
- + TiO2 + SiO2 + TiO2
- SiO2 + T2
- and optionally,
- (D) an outer protective layer.
Dependencies are inferred from the claim text.