EP3643511B1 - Élément de sécurité et support de données équipé de l'élément de sécurité - Google Patents

Élément de sécurité et support de données équipé de l'élément de sécurité Download PDF

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Publication number
EP3643511B1
EP3643511B1 EP19020558.3A EP19020558A EP3643511B1 EP 3643511 B1 EP3643511 B1 EP 3643511B1 EP 19020558 A EP19020558 A EP 19020558A EP 3643511 B1 EP3643511 B1 EP 3643511B1
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EP
European Patent Office
Prior art keywords
layer
security element
semi
transparent
data carrier
Prior art date
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Active
Application number
EP19020558.3A
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German (de)
English (en)
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EP3643511A1 (fr
Inventor
Giselher Dorff
Kai Herrmann SCHERER
Thomas Mang
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Giesecke and Devrient Currency Technology GmbH
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Giesecke and Devrient Currency Technology GmbH
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Publication of EP3643511A1 publication Critical patent/EP3643511A1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/373—Metallic materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/324—Reliefs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/328—Diffraction gratings; Holograms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/351—Translucent or partly translucent parts, e.g. windows
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/355—Security threads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/40—Manufacture
    • B42D25/405—Marking
    • B42D25/425—Marking by deformation, e.g. embossing

Definitions

  • the invention relates to a security element for protecting documents of value, comprising in sequence a carrier substrate, an embossing lacquer layer, a Cr layer serving as an adhesion promoter layer and a semi-transparent layer structure which gives a viewer a different color impression when viewed in incident light and when viewed in transmitted light .
  • the invention also relates to a data carrier with such a security element.
  • Data carriers such as value or identification documents, or other valuables, such as branded items, are often provided with security elements for security purposes, which allow the authenticity of the data carrier to be checked and which at the same time serve as protection against unauthorized reproduction.
  • Security elements with effects that depend on the viewing angle play a special role in securing authenticity, as these cannot be reproduced even with the most modern copiers.
  • the security elements are equipped with optically variable elements that give the viewer a different image impression from different viewing angles and, for example, show a different color or brightness impression and/or a different graphic motif depending on the viewing angle.
  • the color-shift effect is based on viewing-angle-dependent interference effects due to multiple reflections in the various sub-layers of the element.
  • the path difference of the light reflected at the different layers depends on the one hand on the optical thickness of a dielectric spacer layer, which defines the distance between a semi-transparent absorber layer and a reflection layer, and on the other hand varies with the respective viewing angle. Since the path difference is of the order of magnitude of the wavelength of visible light, an angle-dependent color impression results for the viewer due to the extinction and amplification of certain wavelengths.
  • a large number of different color shift effects can be designed by a suitable choice of material and thickness of the dielectric spacer layer.
  • security elements with multilayer thin-layer elements which appear in a first color when viewed in reflected light, ie in reflection, and in a second color when viewed in transmitted light, ie in transmission.
  • the WO 2011/082761 A1 describes a thin film element with a multilayer structure which appears gold when viewed in reflected light and blue when viewed in transmitted light.
  • the multilayer structure is based on two semi-transparent mirror layers and a dielectric spacer layer arranged between the two mirror layers.
  • the DE 10 2017 106545 A1 describes a method for producing an optical security feature, the method comprising the following steps: formation of a first electrically conductive lacquer layer on a first surface of a dielectric substrate, the first conductive lacquer layer having one or more first colorants and/or a first relief structure in at least one Surface of the first electrically conductive lacquer layer is shaped, electroplating of a first metal layer on at least a partial area of the surface of the first electrically conductive lacquer layer opposite the dielectric substrate using the first electrically conductive lacquer layer as a cathode or anode in electroplating, as well as a security element and a security document.
  • the WO 2016/096086 A1 describes a security element that has a coating made of a material that has an optically variable effect, in particular a color shift effect and gaps that can be seen in transmitted light, the security element comprising a carrier substrate and a partial layer with gaps and a layer structure that causes a color shift effect, the security element on the side on which the coating of the material exhibiting an optically variable effect has one or more partial coatings of one layer with colors transparent in visible light and fluorescent in UV light.
  • the EP 1798055 A2 describes a security element for the clearly assignable identification and labeling of data carriers, valuable documents and/or packaging and the like, having a carrier substrate, the security element having at least one motif composed of elements present in a halftone screen or in full tone and consisting of at least one colored or transparent metal compound layer and at least has a full-surface or partial reflector or mirror layer.
  • a thin metal or metal oxide layer can be applied as an adhesion promoter, for example by sputtering or vapor deposition, simultaneously with the use of a plasma or corona or flame treatment. Cr, Al, Ag, Ti, Cu, TiO 2 , Si oxides or chromium oxides are particularly suitable.
  • the invention is based on the object of specifying a security element of the type mentioned at the outset that is improved in terms of production.
  • observation in incident light is illumination of the data carrier from one side and observation of the data carrier from the same side.
  • Observation in reflected light is therefore present, for example, when the front side of the data carrier is illuminated and also viewed.
  • viewing in transmitted light is illuminating a data carrier from one side and viewing the data carrier from another side, in particular the opposite side.
  • An observation in transmitted light is therefore present, for example, when the back of the data carrier is illuminated and the front of the data carrier is viewed. The light thus shines through the data carrier.
  • the data carrier substrate of the data carrier is in particular a paper substrate or a paper-like substrate, a polymer substrate, a paper/foil/paper composite substrate or a foil/paper/foil composite substrate.
  • a document of value or security paper provided with a window area can be produced, for example, by means of a continuous recess within the paper layer(s).
  • the paper layer can be made transparent in a certain area by means of a suitable liquid, for example by means of an aqueous sulfuric acid solution.
  • a window area can, for example, by means of congruent recesses in the on the Front and back of the polymer substrate applied opaque print layers are generated.
  • a carrier substrate such as a foil, having an embossed lacquer layer with an embossed relief structure is provided with a semitransparent layer structure by means of a thin Cr layer as an adhesion promoter layer.
  • the invention is based on the finding that the stability and adhesion of a semi-transparent layer structure arranged on a (UV) embossing lacquer layer is very low and is significantly increased by the presence of a thin Cr layer.
  • the semi-transparent layer structure is formed in particular by means of vapor deposition and is an Al/SiO 2 /Al layer structure or an Ag/SiO 2 /Ag layer structure.
  • Such a multilayer structure which appears gold when viewed in reflected light and shows a blue hue when viewed in transmitted light, is, for example, from WO 2011/082761 A1 known.
  • the semi-transparent layer structure which gives a viewer a different color impression when viewed in incident light and when viewed in transmitted light, is based on two semi-transparent metallic layers and a dielectric spacer layer arranged between the two semi-transparent metallic layers. The sum corresponds to the optimum optical properties being achieved the layer thicknesses of the Cr layer and the semitransparent metallic layer of the semitransparent layer structure adjoining the Cr layer the layer thickness of the semitransparent metallic layer of the semitransparent layer structure remote from the Cr layer.
  • the layer structure of the security element according to the invention has semi-transparent areas which are formed in the form of patterns, characters or a code.
  • the security element according to the invention can in particular be designed as a so-called laminate film in which the carrier or the carrier substrate is firmly anchored with the embossing lacquer layer.
  • the laminate film which is present in particular in the form of a patch, a strip or a thread, can then be applied to a value-document substrate together with the carrier. In particular, on this Way a window or a recess in the value document substrate are closed.
  • the security element according to the invention can be designed as a so-called transfer film in which the carrier or the carrier substrate is not firmly anchored to the embossing lacquer layer but can be detached from the embossing lacquer layer.
  • the transfer film which is present in particular in the form of a patch, a strip or a thread, can be applied to a value-document substrate without the carrier substrate of the transfer film remaining on the value-document substrate.
  • Such a procedure is particularly suitable in the case that the value document substrate to be equipped with the security element is a polymer substrate. In this way the layer thickness in the product obtained is not too high.
  • a UV-curing embossing varnish can advantageously be used as the embossing varnish, but a heat-curing embossing varnish can also be used.
  • the thin Cr layer serving as adhesion promoter has a layer thickness in a range from 0.1 nm to 5 nm.
  • a layer thickness in a range from 0.2 nm to 4 nm is particularly preferred.
  • the security element according to the invention can additionally be equipped with magnetic and/or fluorescent security features.
  • the invention further relates to a data carrier with a security element of the type described above Paper banknote, a polymer banknote or a laminated foil banknote, a share, a bond, a certificate, a voucher, a cheque, a high-value admission ticket, but also an identification card, such as a credit card, a bank card, a cash payment card, an authorization card, an identity card or trade a passport personalization page.
  • a security element of the type described above Paper banknote, a polymer banknote or a laminated foil banknote, a share, a bond, a certificate, a voucher, a cheque, a high-value admission ticket, but also an identification card, such as a credit card, a bank card, a cash payment card, an authorization card, an identity card or trade a passport personalization page.
  • figure 1 shows a schematic representation of a bank note 1 with a transparent window area 3 (shown in broken lines) with a security element 2 according to the invention in the form is provided with a patch.
  • the bank note 1 is based on a paper substrate 4 which has a continuous gap in area 3 .
  • the continuous gap is covered on at least one side of the paper substrate 4 by the security element according to the invention, which is present as a laminate film.
  • the paper substrate can optionally be provided with an additional transparent film.
  • the additional transparent film can, for example, cover at least the area of the continuous recess.
  • the banknote shown has the denomination "20" produced by printing in the lower left area.
  • the figure 2 shows a security element 2 according to the invention according to a first embodiment in a cross-sectional view.
  • the security element 2 is semi-transparent in the areas marked with the letter "A", the viewer perceives these areas when viewed in incident light in the form of a gold-colored metallization, when viewed in transmitted light the viewer perceives these areas in a blue hue.
  • the security element 2 is opaque, metallic, both when viewed in reflected light and when viewed in transmitted light.
  • the security element 2 is transparent in the areas outside of the areas “A” and “B”.
  • the security element 2 is arranged in the window area of the paper substrate 4 of the bank note 1 by means of an adhesive layer 5, for example a heat-sealing lacquer.
  • the carrier 6 in the form of a transparent plastic film, for example a PET film, has an embossing lacquer 7 .
  • the relief structure (ie the surface) of the embossing varnish 7 contains a microstructure, for example.
  • the semi-transparent thin-film elements which give a viewer a different color impression when viewed in reflected light and when viewed in transmitted light; in the present case these are thin-film elements, each of which has two semi-transparent mirror layers (with the reference numbers 9 and 11) and a dielectric spacer layer 10 arranged between the two mirror layers.
  • Such a thin-film element which appears gold in reflected light and blue in transmitted light, is in WO 2011/082761 A1 described.
  • the semitransparent mirror layer 9 is an Al layer with a layer thickness of 9 nm.
  • the semitransparent mirror layer 11 is also an Al layer and has a layer thickness of 10 nm.
  • the dielectric spacer layer 10 is an SiO 2 layer and has a layer thickness of 125 nm.
  • the opaque area 12 is formed by an Al metallization with a comparatively high layer thickness.
  • the semi-transparent areas with the letter "A” form a background surrounding the number "20" when the banknote 1 is viewed from above.
  • the opaque, reflective area "B" formed by an Al layer 12 produces the number "2" when the bank note 1 is viewed from above.
  • the security element 2 is transparent in the areas outside of the areas “A” and “B”; these transparent areas produce the number “0” when the bank note 1 is viewed from above.
  • the security element 2 is protected by a protective lacquer 13 on the upper side.
  • the security element 2 shows, for example, interesting three-dimensional warping effects in the areas "A" and/or "B".
  • the figure 3 shows another security element 22 according to the invention according to a second embodiment in a cross-sectional view.
  • the security element 22 is semi-transparent in the areas marked with the letter "A", the viewer perceives these areas when viewed in incident light in the form of a gold-colored metallization, when viewed in transmitted light the viewer perceives these areas in a blue hue.
  • the security element 22 is opaque, metallic, both when viewed in reflected light and when viewed in transmitted light.
  • the security element 22 is transparent.
  • the security element 22 is arranged in the window area of the paper substrate 4 of the banknote 1 by means of an adhesive layer 5, for example a heat-sealing lacquer.
  • a protective lacquer layer 13 is present adjacent to the adhesive layer 5 .
  • the semitransparent mirror layer 9 is an Al layer with a layer thickness of 9 nm.
  • the semitransparent mirror layer 11 is also an Al layer and has a layer thickness of 10 nm.
  • the dielectric spacer layer 10 is an SiO 2 layer and has a layer thickness of 125 nm.
  • the opaque area 12 is formed by an Al metallization with a comparatively high layer thickness.
  • the semi-transparent areas with the letter "A” form a background surrounding the number "20" when the banknote 1 is viewed from above.
  • the opaque, reflective area "B" formed by an Al layer 12 produces the number "2" when the bank note 1 is viewed from above.
  • the security element 22 is transparent in the areas outside of the areas “A” and “B”; these transparent areas generate the number “0” when the bank note 1 is viewed from above.
  • the carrier 6 in the form of a transparent plastic film, e.g. a PET film, has an embossing lacquer 7 .
  • the relief structure (i.e. the surface) of the embossing varnish 7 contains, for example, a microstructure.
  • the embossing varnish 7 is followed by a thin Cr layer 8 with a layer thickness of 1 nm, which serves as an adhesion promoter layer.

Claims (9)

  1. Elément de sécurité (2, 22) destiné à la sécurisation de documents de valeur (1), comportant, dans l'ordre, un substrat porteur (6), une couche de vernis de gaufrage (7), une couche de Cr (8) servant de couche de promoteur d'adhérence et ayant une épaisseur de couche située entre 0,1 nm et 5 nm, et une disposition en couches semi-transparente qui offre à un observateur, lors d'une observation en lumière incidente et lors d'une observation en lumière transmise, une impression de couleur différente et est basée sur deux couches (9, 11) métalliques semi-transparentes et une couche diélectrique d'espacement (10) agencée entre les deux couches (9, 11) métalliques semi-transparentes, cependant que les deux couches (9, 11) métalliques semi-transparentes sont choisies indépendamment l'une de l'autre parmi Al ou Ag et la couche diélectrique (10) est une couche de SiO2, cependant que la somme des épaisseurs de couches de la couche de Cr (8) et de la couche (9) métallique semi-transparente adjacente à la couche de Cr (8) de la disposition en couches semitransparente correspond à l'épaisseur de couche de la couche (11) métallique semi-transparente, de la disposition en couches semi-transparente, éloignée de la couche de Cr (8).
  2. Elément de sécurité selon la revendication 1, cependant que la couche de Cr (8) servant de couche de promoteur d'adhérence a une épaisseur de couche située entre 0,2 nm et 4 nm.
  3. Elément de sécurité selon une des revendications 1 ou 2, cependant que l'élément de sécurité apparaît doré lors de l'observation en lumière incidente, et présente une teinte bleue lors de l'observation en lumière transmise.
  4. Elément de sécurité selon une des revendications de 1 à 3, cependant que la couche de vernis de gaufrage (7) est pourvue d'une structure en relief gaufrée, et la structure en relief constitue en particulier une structure diffractive telle qu'un hologramme, une image holographique à réseau ou une structure de diffraction s'apparentant à un hologramme, ou une structure achromatique telle que par exemple une structure mate, ou un agencement de micro-miroirs ou un réseau blazé ayant un profil à sillons en dents de scie ou un agencement de lentilles de Fresnel ou une combinaison de deux ou de plusieurs des éléments précités.
  5. Elément de sécurité selon une des revendications de 1 à 4, cependant que la disposition en couches semi-transparente qui offre à un observateur, lors d'une observation en lumière incidente et lors d'une observation en lumière transmise, une impression de couleur différente est constituée sous forme de motifs, de caractères ou d'une codification.
  6. Elément de sécurité selon une des revendications de 1 à 5, cependant que l'élément de sécurité est un fil de sécurité, un ruban de sécurité ou un patch ou une étiquette.
  7. Support de données (1) ayant un élément de sécurité (2, 22) selon une des revendications de 1 à 6.
  8. Support de données selon la revendication 7, cependant que l'élément de sécurité est agencé dans une zone fenêtre (3) transparente du support de données.
  9. Support de données selon la revendication 7 ou 8, cependant que le support de données est un document de valeur tel que par exemple un billet de banque, en particulier un billet de banque en papier, billet de banque en polymère ou billet de banque en feuille composite, ou une carte d'identification.
EP19020558.3A 2018-10-15 2019-10-07 Élément de sécurité et support de données équipé de l'élément de sécurité Active EP3643511B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102018008147.9A DE102018008147A1 (de) 2018-10-15 2018-10-15 Sicherheitselement und mit dem Sicherheitselement ausgestatteter Datenträger

Publications (2)

Publication Number Publication Date
EP3643511A1 EP3643511A1 (fr) 2020-04-29
EP3643511B1 true EP3643511B1 (fr) 2022-07-06

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EP19020558.3A Active EP3643511B1 (fr) 2018-10-15 2019-10-07 Élément de sécurité et support de données équipé de l'élément de sécurité

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EP (1) EP3643511B1 (fr)
DE (1) DE102018008147A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020007728A1 (de) * 2020-12-17 2022-06-23 Giesecke+Devrient Currency Technology Gmbh Datenträger mit Verbundsubstrat mit einem in einem Durchsichtsbereich angeordneten Sicherheitselement
DE102021002471A1 (de) * 2021-05-10 2022-11-10 Giesecke+Devrient Currency Technology Gmbh Sicherheitselement mit Volumenhologramm und zusätzlichen Effekten
DE102021002600A1 (de) * 2021-05-18 2022-11-24 Giesecke+Devrient Currency Technology Gmbh Wertdokument und Verfahren zur Herstellung eines Wertdokuments
EP4306329A1 (fr) * 2022-07-15 2024-01-17 Hueck Folien Gesellschaft m.b.H. Élément de sécurité
EP4306328A1 (fr) * 2022-07-15 2024-01-17 Hueck Folien Gesellschaft m.b.H. Élément de sécurité
DE102022002765A1 (de) 2022-07-29 2024-02-01 Giesecke+Devrient Currency Technology Gmbh Sicherheitselement und mit dem Sicherheitselement ausgestattetes Wertdokument

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DE10319232A1 (de) * 2003-04-28 2004-11-18 Giesecke & Devrient Gmbh Flächiges Sicherheitselement und Herstellungsverfahren für dasselbe
GB0326576D0 (en) * 2003-11-14 2003-12-17 Printetch Ltd Printing composition
AT502021B1 (de) * 2005-06-01 2007-01-15 Hueck Folien Gmbh Sicherheitselemente mit funktionsschichten und verfahren zu deren herstellung
AT503714A2 (de) * 2005-12-13 2007-12-15 Hueck Folien Ges Mbh Sicherheitselemente und sicherheitsmerkmale mit metallisch erscheinenden farbeffekten
US20120029121A1 (en) * 2008-12-19 2012-02-02 Basf Se Thin aluminium flakes
RU2562031C2 (ru) * 2009-11-27 2015-09-10 Басф Се Композиции для покрытий защитных элементов и голограмм
DE102009058243A1 (de) * 2009-12-14 2011-06-16 Giesecke & Devrient Gmbh Dünnschichtelement mit Mehrschichtstruktur
AU2013276625B2 (en) * 2012-06-14 2017-09-14 Basf Se Method for manufacturing security elements and holograms
DE102014001688A1 (de) * 2014-02-07 2015-08-13 Giesecke & Devrient Gmbh Herstellung eines Sicherheitselements mit Farbänderungseigenschaften
DE102014001842A1 (de) * 2014-02-11 2015-08-13 Giesecke & Devrient Gmbh Verfahren zum Herstellen eines Sicherheitselements mit Negativschrift und daraus erhältliches Sicherheitselement
AT516688A1 (de) * 2014-12-15 2016-07-15 Hueck Folien Gmbh Sicherheitselement mit Farbkippeffekt und fluoreszierenden Merkmalen, Verfahren zu dessen Herstellung und dessen Verwendung
DE102017106545A1 (de) * 2017-03-27 2018-09-27 Ovd Kinegram Ag Verfahren zur Herstellung eines optischen Sicherheitsmerkmals sowie ein Sicherheitselement und ein Sicherheitsdokument

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DE102018008147A1 (de) 2020-04-16

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