Methods and apparatus for producing enhanced interference pigments
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United States of America Patent
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Jun 5, 2001
Grant Date -
N/A
app pub date -
Sep 3, 1999
filing date -
Sep 3, 1999
priority date (Note) -
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Abstract
Methods and apparatus are provided for uniformly depositing a coating material from a vaporization source onto a powdered substrate material to form a thin coalescence film of the coating material that smoothly replicates the surface microstructure of the substrate material. The coating material is uniformly deposited on the substrate material to form optical interference pigment particles. The thin film enhances the hiding power and color gamut of the substrate material. Physical vapor deposition processes are used for depositing the film on the substrate material. The apparatus and systems employed in forming the coated particles utilize vibrating bed coaters, vibrating conveyor coaters, or coating towers. These allow the powdered substrate material to be uniformly exposed to the coating material vapor during the coating process.
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