Multilayer interference pigments
AssigneeMerck Patent Gesellschaft
InventorsHans-Dieter Brückner, Andrea Heyland, Christoph Schmidt, Christina Schank, Claudia Seibel
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Abstract
Multilayer interference pigment consisting of a transparent carrier material coated with alternating layers of metal oxides of low and high refractive index, the difference in the refractive indices being at least 0.1, which is obtainable by alternate coating of the transparent carrier material with a metal oxide of high refractive index and with a metal oxide of low refractive index in a wet process by hydrolysis of the corresponding water-soluble metal compounds, separation, drying and, if desired, calcination of the resulting pigment.
Claims16
A multi-layer interference pigment comprising a transparent carrier material coated with a first layer of a high refractive index material, and thereon alternating layers of low refractive index material then high refractive index material, the difference in refractive indices being at least 0.1, wherein the respective oxide layers of high refractive index consist of a non-absorbing colorless oxide or mixture thereof.
A multi-layer interference pigment comprising a transparent carrier material coated with a first layer of a high refractive index material, and thereon alternating layers of a low refractive index material and high refractive index material, the difference in refractive indices being at least 0.1, wherein the high refractive index material alternating with the low refractive index material is ZnO, TiO2 or ZrO2.
Dependencies are inferred from the claim text.