Multilayer nacreous pigment
AssigneeMerck Patent GmbH
InventorsStephanie Andes, Gerald Fuchs-Pohl, Gerhard Pfaff
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Abstract
Multilayer pearl lustre pigment on the basis of a platelet-shaped substrate comprising a material of low refractive index in the range from 1.35 to 1.8, which comprises at least (i) one first layer comprising a material having a refractive index of more than 1.8, (ii) optionally, a second layer comprising a material of low refractive index in the range from 1.35 to 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 silicon dioxide, aluminium oxide, boron oxide or magnesium fluoride.
Claims18
A multilayer pearl lustre pigment comprising a platelet-shaped substrate substantially of a material having a low refractive index in the range from 1.35 to 1.8, and selected from silicon dioxide, aluminium oxide, boron oxide or magnesium fluoride, having thereon:
- (i) one first layer comprising a material having a high refractive index of more than 1.8,
- (ii) optionally, a second layer comprising a material of a low refractive index in the range of 1.35 and 1.8;
- and
- (iii) a semi-transparent metal layer which is applied to the substrate or to the layers (i) or (ii).
Dependencies are inferred from the claim text.