Patent ID: 7083834
Filing Date: 2006-08-01
Classification: B42D,B44F,C09K,G02B,G02F,Y10S

Abstract:
1. A security marking or device comprising an anisotropic polymer film obtainable by a process comprising: coating a polymerizable liquid crystalline or mesogenic material onto a substrate with a structured surface, aligning the polymerizable liquid crystalline or mesogenic material, polymerizing the polymerizable liquid crystalline or mesogenic material to form a polymer film, optionally removing the polymerized film from the substrate, and applying a reflective layer onto the upper surface of the liquid crystalline or mesogenic material polymer film, wherein the structured substrate surface comprises at least two areas of fine grooves or grating by which the molecules of said polymerizable liquid crystal or mesogenic material are homogeneously aligned with their molecular long axes substantially parallel to the substrate surface and substantially parallel to the direction of said fine grooves or grating, and said at least two areas have different direction of the fine grooves or grating, and wherein the liquid crystalline or mesogenic material polymer film has a pattern of at least two areas having different alignments.