Multilayer pearl lustre pigment
AssigneeMerck Patent GmbH
InventorsGerhrad Pfaff, Stephanie Andes, Gerald Fuchs-Pohl
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Abstract
Multilayer pearl luster pigment on the basis of a platelet-shaped substrate comprising a material having a refractive index of more than 1.8, which comprises at least (i) a first layer of a material of low refractive index in the range from 1.35 to 1.8, (ii) optionally, a second layer of a material having a refractive index of more than 1.8. (iii) a semitransparent metal layer which is applied to the substrate or to the layers (i) or (ii) and (iv) if desired, an aftercoating, the substrate being platelet-shaped titanium dioxide, zirconium dioxide, α-iron(III) oxide, tin dioxide or zinc oxide.
Claims14
A multilayer pearl luster pigment comprising a platelet-shaped substrate, which substrate comprises a material having a refractive index of more than 1.8, and, on the substrate, at least:
- (i) a first layer of a material of low refractive index in the range from 1.35 to 1.8,
- (ii) a second layer, coated on the first layer, of a material having a refractive index of more than 1.8, and
- (iii) a semitransparent metal layer, having a thickness of from 5 to 20 nm, either coated on the substrates, coated on layer (ii), or coated on the second layer of a repeated first and second layer coated on layer (ii), and
- (iv) optionally, an aftercoating.
Dependencies are inferred from the claim text.