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US 6,280,520 B1Granted
Multilayer pearl luster pigment based on an opaque substrate
AssigneeMerck Patent GmbH
InventorsStephanie Andes, Dieter Brückner, Gerald Fuchs-Pohl, Matthias Kuntz, Gerhard Pfaff, Reiner Vogt
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Abstract
Multilayer pearl luster pigment based on an absorbing platelet-shaped substrate which is coated with alternating layers of a material of low refractive index and a material of high refractive index, or with a metal, the difference in the refractive indices being at least 0.1.
Claims13
A pearl luster pigment comprising a platelet shaped, non-metallic substrate which is opaque and having at least
- (a) one first layer comprising a metal oxide of high refractive index, or a metal
- (b) one second layer comprising a metal oxide of low refractive index, and
- (c) one third layer comprising a metal oxide of high refractive index, or a metal,
- wherein the substrate is of graphite platelets or is a platelet shaped carrier material coated with graphite.
1 more element
Dependencies are inferred from the claim text.