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    Printing diffraction gratings on paper and board
    3.
    发明授权
    Printing diffraction gratings on paper and board 有权

    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.

    Security element
    6.
    发明授权
    Security element 有权

    公开(公告)号：US12296391B2

    公开(公告)日：2025-05-13

    申请号：US17424607

    申请日：2020-01-20

    Applicant: BASF SE

    Inventor： Nikolay A. Grigorenko ,  Michelle Richert

    IPC: B22F7/04 ,  B22F1/054 ,  B42D25/373 ,  B42D25/382 ,  B42D25/45 ,  C09D11/033 ,  C09D11/037 ,  C09D11/14

    Abstract: The present invention relates to security elements, comprising (a) a substrate, (b) on at least part of the substrate surface a metal layer, (c) optionally on at least part of the metal layer a dielectric layer, (d) on at least part of the metal layer, or the dielectric layer, a layer obtained by overcoating the metal layer, or the dielectric layer with a composition, comprising (i) silver nanoparticles, (ii) a solvent, (iii) (surface) stabilizing agent(s) and (iv) optionally a binder, and (e) a protective layer on top of layer (d). The maximum absorption wavelength of the silver nanoparticles in layer (d) is controlled by the amount of (surface) stabilizing agent(s) and optionally binder relative to the amount of silver nanoparticles to be preferably in the range of 700 to 1600 nm.

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