Patent ID: 8993219
Filing Date: 2015-03-31
Classification: B05D,B41M,B42D,G03H

Abstract:
1. A method for forming a surface relief microstructure on a paper substrate, the method comprising: A) applying a curable composition to at least a portion of a frontside of the paper substrate; B) contacting at least a portion of the curable composition with the surface relief microstructure; C) curing the composition with a UV lamp which is arranged on a backside of the paper substrate wherein the paper substrate moving at a rate of at least 40 m/min; and D) optionally depositing a layer of a transparent high refractive index material, a metallic layer, or both, on at least a portion of the cured composition, wherein the UV lamp has an emission peak in a UV-A range and additionally in a near VIS range, and the curable composition comprises a photoinitiator which absorbs in the UV-A range and in addition, in the near VIS range.