公开(公告)号：US10322603B2

公开(公告)日：2019-06-18

申请号：US14578657

申请日：2014-12-22

Applicant: BASF SE

Inventor： Michelle Richert ,  Thomas Bolle ,  Roland Fleury

IPC: G03H1/04 ,  B41M7/00 ,  B41M3/14 ,  B42D25/23 ,  B42D25/24 ,  B42D25/328 ,  B42D25/324 ,  B42D25/30 ,  B42D25/378 ,  B42D25/405 ,  B42D25/21 ,  B42D25/373 ,  G03H1/02 ,  B42D25/42 ,  B42D25/425 ,  B42D25/29 ,  B05D3/06 ,  B41M3/06 ,  B41M1/24 ,  G03H1/18

Abstract: A method and an apparatus for forming a surface relief microstructure, especially an optically variable image on a paper substrate are provided, the method comprising the steps of: A) applying a curable composition to at least a portion of the frontside of the paper substrate; B) contacting at least a portion of the curable composition with surface relief microstructure, especially optically variable image forming means; C) curing the composition by using at least one UV lamp (1, 2, 3) which is arranged on the backside of the paper substrate; D) optionally depositing a layer of a transparent high refractive index material and/or a metallic layer on at least a portion of the cured composition, wherein the lamp (1, 2, 3) having emission peak(s) in the UV-A and near VIS range and the curable composition comprises at least a photoinitiator which absorbs in the UV-A region and preferably in the near VIS range. A paper product obtainable uses the method and an apparatus for forming a surface relief microstructure on a paper substrate. Surface relief microstructures, such as holograms may be replicated rapidly and with accuracy on a paper substrate by using the method and the apparatus.