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US 7,118,622 B2Granted
Organic dyes suitable for use in drugs and cosmetics laked onto a platy titanium dioxide pigment
AssigneeEngelhard Corporation
InventorsFrank A. Mazzella, Gabriel E. Uzunian
Life of this patent
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Abstract
An unsupported platy titanium dioxide pigment containing an organic dye laked thereon. The dyed TiO2 pigment is useful to color cosmetic, food, and drug formulations.
Claims18
An unsupported platy TiO2 pigment having at least one laked organic dye contained thereon, said platy TiO2 pigment containing a pair of adjacent TiO2 plates having a film of air between said plates.
A pigment comprising a platy substrate of kaolin or a synthetic platy substrate having a metal oxide coating thereon, and an organic dye laked onto said metal oxide coating.
A method of forming a dyed TiO2 pigment comprising:
- (a) encapsulating a platy mica substrate with a coating of TiO2,
- (b) extracting the mica substrate to form an unsupported platy TiO2 pigment, said platy TiO2 pigment containing a pair of adjacent TiO2 plates having a film of air between said plates, and
- (c) laking at least one organic dye onto said TiO2 pigment.
Dependencies are inferred from the claim text.