G - Physics – 02 – B
Patent
G - Physics
02
B
G02B 5/28 (2006.01) C09C 1/00 (2006.01) G02B 5/22 (2006.01)
Patent
CA 2406956
The invention discloses magnetic OVP, said pigment consisting of thin-layer flakes having a basic metal-dielectric- metal structure to result in a viewing-angle dependent color appearance, and having, in addition to said viewing-angle dependent color appearance, incorporated magnetic properties, to make them distinguishable from OVP of similar appearance but not having said magnetic properties. The invention discloses as well methods for obtaining such pigments and the use of such pigments as security elements in inks, coatings and articles.
L'invention concerne un pigment à couleur changeante (OVP) magnétique, ledit pigment étant composé de paillettes en couches minces comportant une structure basique métal-diélectrique-métal, procurant un aspect chromatique variant en fonction de l'angle de vue, et comportant, outre cet aspect chromatique variant en fonction de l'angle de vue, des propriétés magnétiques incorporées qui distinguent ce type de pigments des OVP d'aspect similaire mais ne possédant pas ces propriétés magnétiques. L'invention concerne en outre des procédés d'obtention de ces pigments, ainsi que l'utilisation desdits pigments comme éléments de sécurité dans des encres, des revêtements et des articles.
Despland Claude-Alain
Muller Edgar
Seto Myron
Tiller Thomas
Mcfadden Fincham
Sicpa Holding S.a.
Sicpa Holding Sa
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