OPTICAL VARIABLE EFFECT PIGMENTS

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United States of America Patent

APP PUB NO 20100218703A1
SERIAL NO

12670862

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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The present invention relates to pigments comprising (A) a platelet-shaped substrate (S), (B) a coating comprising two different metal oxides having a difference in refractive index of at least 0.1, wherein the metal oxide having a higher refractive indexis the metal oxide MOH and the metal oxide having a lower refractive index is the metal oxide MOL, wherein the amount of MOH and the amount of MOL changes (continuously), (C) a coating comprising metal oxides MOH and MOL, wherein the amount of MOH and the amount of MOL changes (continuously), and (D) optionally an outer protecting layer; a process for their production and their use in paints, ink-jet printing, for dyeing textiles, for pigmenting coatings (paints), printing inks, plastics, cosmetics, glazes for ceramics and glass. The pigments can show enhanced colour chroma while maintaining the lightness of coventional interference pigments, or vice versa.

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Patent Owner(s)

Patent OwnerAddress
CIBA CORPORATION540 WHITE PLAINS ROAD PATENT DEPARTMENT TARRYTOWN NY 10591

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Bugnon, Philippe Le Mouret, CH 57 410
Bujard, Patrice Courtepin, CH 79 907

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