Optically variable interference pigments
AssigneeEngelhard Corporation
InventorCarmine V. DeLuca JR.
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Abstract
Optically variable interference pigments are composed of platelets of at least partly core-free titanium dioxide-coated substrate of about 1-25 mm particle size and an interference thickness of about 5-600 nm which have an oxide coating thereon.
Claims19
A color variable titanium dioxide effect pigment comprising at least partly substrate-free titanium dioxide-coated substrate platelets of about 1-25 μm in maximum dimension and an interference thickness of about 5-600 nm, said platelets having an oxide coating thereon.
A method of preparing an optically variable titanium dioxide effect pigment comprising providing platelets of an at least partly substrate-free titanium dioxide-coated substrate platelets of about 1-25 μm in maximum dimension and an interference thickness of about 5-600 nm, depositing a hydrous metal layer on the platelets and calcining the hydrous metal-coated platelets.
The method of claim 15, further comprising removing at least about 30% of the substrate from a titanium dioxide-coated substrate platelets.
Dependencies are inferred from the claim text.