Multilayered interference pigments
AssigneeMerck Patent Gesellschaft mit beschraenkter Haftung
InventorsGerhard Pfaff, Helge Kniess, Peter Reynders
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Abstract
The invention relates to multilayered interference pigments which comprise a platelet-shaped substrate of silicon dioxide which is coated alternately with layers of light-transparent materials having refractive indices of n>1.8 and layers of light-transparent materials having refractive indices of n≦1.8, where the optical thickness of the platelet-shaped substrate and the optical thickness of the individual layers of light-transparent materials having refractive indices of n≦1.8 are the same.
Claims15
A multilayered interference pigment, comprising a substrate of platelet-shaped silicon dioxide which is coated alternately with two or more layers of light-transparent materials having refractive indices of n>1.8 and therebetween one or more layers of light-transparent materials having refractive indices of n≦1.8, where the optical thickness of the platelet-shaped substrate and the optical thickness of the individual layers of light-transparent materials having refractive indices of n≦1.8 is substantially the same.
A multilayered interference pigment, comprising a substrate of platelet-shaped silicon dioxide which is coated alternately with two or more layers of light-transparent materials having refractive indices of n>1.8 and therebetween one or more layers of light-transparent materials having refractive indices of n≦1.8, where the optical thickness of the platelet-shaped substrate and the optical thickness of the individual layers of light-transparent materials having refractive indices of n≦1.8 is the same.
Dependencies are inferred from the claim text.