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AssigneeMerck Patent Gesellschaft mit beschraenkter Haftung
InventorsMatthias Kuntz, Hans-Dieter Brueckner, David Coates, Rodney Riddle
Estimating the term…
The invention relates to multilayer reflective films and pigments showing selective reflection of light wherein the reflection characteristics are dependent on the viewing angle, characterized in that they comprises at least one reflective layer, at least one circular polarizing layer and optionally at least one optical retardation layer. The invention further relates to the use of these multilayer reflective films and pigments in optical elements, as coatings or in lacquers, inks or paints for cosmetic, decorative or security applications, to inks and paints comprising one or more multilayer reflective pigments dispersed in a light transmissive binder, and to security markings or devices comprising one or more multilayer reflective films or pigments.
A multilayer reflective film or multilayer reflective pigment comprising at least one reflective layer and at least one circular polarizing layer, said circular polarizing layer comprising a linear polarizing layer and a quarter wave retardation layer, wherein said linear polarizing layer comprises a vitrified, polymerized or crosslinked liquid crystal material with planar orientation and/or said quarter wave retardation layer comprises a vitrified, polymerized or crosslinked liquid crystal material with planar or tilted orientation, and whereby said film or pigment selectively reflects light dependent on the viewing angle.
Dependencies are inferred from the claim text.