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US 4,867,793 AGranted
Nacreous pigments
AssigneeMerck Patent GmbH
InventorsKlaus D. Franz, Kalus Ambrosius, August Kanpp, Hans D. Brucker
Life of this patent
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Abstract
Platelet-shaped colored pigments in which a platelet-shaped substrate is provided with a compact coating containing iron(II) oxide, which coating has a high gloss and, depending on the layer thickness, shows the interference color of thin platelets, are described.
Claims20
A platelet-shaped nacreous pigment comprising a platelet-shaped substrate and coated thereon, a smooth and compact layer containing an amount of iron(II) oxide and having sufficient smoothness and compactness that when in contact with a this platelet, it is capable of producing interference colors.
Dependencies are inferred from the claim text.