EP4311683A1 - Élément de sécurité et document de valeur pourvu d'un élément de sécurité - Google Patents

Élément de sécurité et document de valeur pourvu d'un élément de sécurité Download PDF

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Publication number
EP4311683A1
EP4311683A1 EP23020354.9A EP23020354A EP4311683A1 EP 4311683 A1 EP4311683 A1 EP 4311683A1 EP 23020354 A EP23020354 A EP 23020354A EP 4311683 A1 EP4311683 A1 EP 4311683A1
Authority
EP
European Patent Office
Prior art keywords
layer
security element
color
value
document
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP23020354.9A
Other languages
German (de)
English (en)
Inventor
Giselher Dorff
Josef Schinabeck
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
Original Assignee
Giesecke and Devrient Currency Technology GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Giesecke and Devrient Currency Technology GmbH filed Critical Giesecke and Devrient Currency Technology GmbH
Publication of EP4311683A1 publication Critical patent/EP4311683A1/fr
Pending legal-status Critical Current

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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
    • B42D25/355—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
    • B42D25/45—Associating two or more layers
    • B42D25/465—Associating two or more layers using chemicals or adhesives

Definitions

  • the invention relates to a security element for securing documents of value, the security element having an arrangement with a color-shifting thin-layer structure and an adhesive layer suitable for bonding the security element to a document of value to be secured with it, the color-shifting thin-layer structure in the order of a semi-transparent absorber layer facing the viewer, a dielectric spacer layer and a reflection layer.
  • the invention further relates to a document of value with such a security element.
  • Security elements for security purposes, which allow the authenticity to be checked and which at the same time serve as protection against unauthorized reproduction.
  • Security elements with color-shifting effects or viewing angle-dependent effects play a special role in ensuring authenticity, as these cannot be reproduced even with the most modern copying machines.
  • the security elements are equipped with optically variable elements that give the viewer a different image impression at 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 these Thin-film elements on viewing angle-dependent interference effects through multiple reflections in the various sub-layers of the element.
  • the path difference of the light reflected on the different layers depends on the one hand on the optical thickness of a dielectric spacer layer, which determines 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 on the order of the wavelength of visible light, the extinction and amplification of certain wavelengths results in an angle-dependent color impression for the viewer.
  • the thin-film elements exhibiting the color-shifting effect are subject to a significant deterioration in the color impression over time, particularly as banknotes circulate. This is due to the mechanical stress on the thin-film element during the circulation of the respective document of value, but also corrosive wear caused by environmental influences such as oxygen or acidic or basic liquids.
  • 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 durability.
  • viewing in incident light means illuminating the document of value from one side and viewing the document of value from the same side. Viewing in incident light occurs, for example, when the front of the document of value is illuminated and also viewed.
  • viewing in transmitted light means illuminating a document of value from one side and viewing it Document of value from another side, especially the opposite side.
  • Viewing in transmitted light occurs, for example, when the back of the document of value is illuminated and the front of the document of value is viewed. The light thus shines through the document of value.
  • the invention is based on the knowledge that the thin-film element having a color-shifting effect is improved to an extremely high extent in terms of durability, stability and long-term maintenance of the optical effect by placing the color-shifting thin-film structure in the security element arrangement on an area adjacent to the reflection layer Chromium layer, which has a layer thickness in a range from 20nm to 100nm, is applied.
  • the chromium layer with a layer thickness in a range of 20nm to 100nm is a relatively thick layer.
  • the minimum layer thickness of 20 nm is essential to achieve the advantages according to the invention. It was found that in the course of the circulation of valuable documents, wear of the reflection layer of the color-shifting thin-film structure occurs, for example due to corrosive abrasion.
  • the effect can advantageously be brought about that in the event of corrosive abrasion of the reflection layer of the color-shifting thin-film structure reflective function of the reflection layer is taken over by the chrome layer arranged below the reflection layer.
  • the chrome layer preferably has a maximum layer thickness of 60 nm in order to simplify production.
  • the semi-transparent absorber layer is a Cr layer, preferably having a layer thickness in a range of 10nm to 100nm , particularly preferably in a range from 10nm to 60nm.
  • the reflection layer is preferably an Al layer, which preferably has a layer thickness in a range from 10 nm to 100 nm, particularly preferably in a range from 10 nm to 60 nm.
  • the dielectric layer is preferably an SiO 2 layer, a ZnO layer, an Al 2 O 3 layer, a TiO 2 layer, a layer made of a nitride or oxynitride of one of the elements Si, Zn, Al or Ti or an MgF 2 layer or a nitrocellulose layer, for example available from printing technology.
  • optional carrier substrate refers here to a temporary carrier substrate that is removed from the layer composite after the security element has been applied to a valuable document substrate to be secured with it. Detaching can be made easier if a release layer is present.
  • the embossed lacquer layer is provided with an embossed relief structure and the relief structure is in particular a diffractive structure, such as a hologram, a holographic grid image or a hologram-like diffraction structure, or an achromatic structure, such as a matt structure, or a micromirror arrangement or a Blaze grating with a sawtooth-like groove profile or a Fresnel lens arrangement or a combination of two or more of the above-mentioned elements.
  • a diffractive structure such as a hologram, a holographic grid image or a hologram-like diffraction structure, or an achromatic structure, such as a matt structure, or a micromirror arrangement or a Blaze grating with a sawtooth-like groove profile or a Fresnel lens arrangement or a combination of two or more of the above-mentioned elements.
  • the security element according to the invention has at least one area that contains the color-shifting thin-film structure and at least one further area that forms a reflective area.
  • the reflective area is in particular a metallization and is preferably formed by means of an Al layer, for example obtainable by vapor deposition.
  • the reflective area can be created using printing technology. Platelet-shaped metal pigments are suitable for printing production e.g. from the WO 2013/186167 A2 , WO 2010/069823 A1 , WO 2005/051675 A2 (see, for example, the description on page 11, line 10, to page 12, penultimate paragraph) and WO 2011/064162 A2 known.
  • Both the area containing the color-shifting thin-film structure and the further area forming a reflective area can be formed independently of one another in the form of characters, in the form of a pattern or in the form of a coding.
  • the security element according to the invention has at least one transparent area which is formed in the form of characters, in the form of a pattern or in the form of a coding. In this way, negative writing can be created that is particularly easy for the viewer to see in transmitted light.
  • 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 to the embossing lacquer layer.
  • the laminate film which is in particular in the form of a patch, a strip or a thread, can then be applied together with the carrier to a valuable document substrate.
  • a window or a recess in the valuable document substrate can be closed in this way.
  • the security element according to the invention can further be designed as a so-called transfer film, in which the temporary carrier or the temporary carrier substrate is not firmly anchored to the embossing lacquer layer, but can be removed from the embossing lacquer layer, for example by means of a release layer.
  • the transfer film which is particularly in the form of a patch, one Strip or a thread is present, can be applied to a valuable document substrate without the carrier substrate of the transfer film remaining on the valuable 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 security element according to the invention can additionally be equipped with magnetic and/or fluorescent security features.
  • the value document substrate for example a banknote substrate
  • a value document 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 using a suitable liquid, for example an aqueous sulfuric acid solution.
  • a window area can be created, for example, by means of congruent recesses in the opaque print layers applied to the front and back of the polymer substrate.
  • FIG. 1 shows a schematic representation of a banknote 1 with a transparent window area 3 (shown in dashed lines), which is provided with a security element 4 according to the invention in the form of a patch.
  • the banknote 1 is based on a paper substrate 2, which has a continuous recess in area 3.
  • the continuous recess is covered on at least one side of the paper substrate 2 by the security element 4 according to the invention, which is present as a laminate film.
  • the paper substrate 2 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 printed denomination "20" in the lower left area. Furthermore, a further security element 5 according to the invention is applied to the paper substrate 2 of the banknote 1.
  • the security element 5 has the shape of a strip that extends from one end of the banknote 1 to the other end of the banknote 1 and is formed in the form of a transfer film.
  • the Figure 2 shows the security element 4 according to the invention according to a first exemplary embodiment in a cross-sectional view.
  • the viewer perceives the security element 4 from above, ie the top layer 6 of the security element 4 is opposite the viewer.
  • the security element 4 is based on a carrier substrate 6, in the example a polyethylene terephthalate (PET) film, which is provided with an embossing varnish 7.
  • PET polyethylene terephthalate
  • the embossing varnish 7 has a relief structure in the form of a microstructure embossed into the embossing varnish 7 on the surface opposite the carrier substrate 6.
  • the area "B" which is formed, for example, in the form of a character, is based on a reflective, metallic layer 8, which in the example is based on aluminum.
  • the areas “A” each have a color-shifting thin-film structure, which, in the order, has a semi-transparent absorber layer 8 facing the viewer (in the example a Cr layer), a dielectric spacer layer 9 (in the example an SiO 2 layer) and a reflection layer 10 (in the example).
  • Example has an Al layer).
  • the areas “A” are each formed, for example, in the form of a pattern.
  • the color-shifting thin-film structures of the areas "A” are each on a chrome layer 11 which improves the durability of the respective color-shifting thin-film structure and is adjacent to the reflection layer 10 and has a layer thickness of 25 nm. upset.
  • the reference number 12 denotes a leveling varnish, followed by an optional primer layer 13 and an adhesive layer 14, in the example a heat sealing varnish.
  • the production of the in the Figure 2 The security element 4 shown is expediently carried out starting from the carrier substrate 6.
  • a security element based on a multilayer arrangement using a washing ink is known in the prior art, see for example EP 1 972 462 B1 . A reflective, metallic layer is then evaporated over the entire surface.
  • the washing color is washed away, including the reflective, metallic layer vapor-deposited above the washing color. In this way, a reflective, metallic layer 8 remains only in the area "B".
  • a washing ink that can be removed with a suitable solvent, for example water is then printed onto the UV-cured embossing varnish 7 only in the areas "B" and "C”. This is then done full-surface vapor deposition of a thin-film element containing layers 8, 9, 10 and 11.
  • the washing ink is washed away, including the thin-film element containing layers 8, 9, 10 and 11 which has been vapor-deposited above the washing ink. In this way, a thin-film element containing the layers 8, 9, 10 and 11 remains only in the areas "A”.
  • a leveling varnish 12, an optional primer layer 13 and an adhesive layer 14 are then applied.
  • the Figure 3 shows the security element 5 according to the invention according to a second exemplary embodiment in a cross-sectional view.
  • the viewer perceives the security element 5 from above, ie the top layer 7 of the security element 5 is opposite the viewer.
  • the production of the security element 5 is carried out in a similar way to the production of the security element 4 described above, initially using a carrier substrate 6, in the example a polyethylene terephthalate (PET) film, which is provided with a release layer.
  • the embossing varnish 7 and the further layers 8, 9, 10, 11, 12, 13 and 14 are then applied to the release layer.
  • the carrier substrate 6 is finally detached from the embossing varnish 7 by means of the release layer.
  • the carrier substrate 6 is therefore a temporary carrier substrate because it does not remain firmly on the security element 5 produced.
  • the embossing varnish 7 has a relief structure embossed into the embossing varnish 7 in the form of a microstructure.
  • the area "B" which is formed, for example, in the form of a character, is based on a reflective, metallic layer 8, which in the example is based on aluminum.
  • the areas “A” each have a color-shifting thin-film structure which, in the order, has a semi-transparent absorber layer 8 facing the viewer (in the example a Cr layer), a dielectric spacer layer 9 (in the example an SiO 2 layer) and a reflection layer 10 (in the example an Al layer).
  • the areas “A” are each formed, for example, in the form of a pattern.
  • the color-shifting thin-film structures of the areas "A" are each applied to a chrome layer 11 which improves the durability of the respective color-shifting thin-film structure and is adjacent to the reflection layer 10 and has a layer thickness of 25 nm.
  • the chrome layer 11 By means of the chrome layer 11, the effect is advantageously brought about that in the event of corrosive abrasion of the reflection layer 10 of the color-shifting thin-film structure, the reflective function of the reflection layer 10 is taken over by the chrome layer 11 arranged below the reflection layer 10. In this way, an extremely advantageous improvement in the durability of the color-shifting thin-film element is achieved.
  • the reference number 12 denotes a leveling varnish, followed by an optional primer layer 13 and an adhesive layer 14, in the example a heat sealing varnish.

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  • Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Laminated Bodies (AREA)
EP23020354.9A 2022-07-29 2023-07-25 Élément de sécurité et document de valeur pourvu d'un élément de sécurité Pending EP4311683A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102022002765.8A DE102022002765A1 (de) 2022-07-29 2022-07-29 Sicherheitselement und mit dem Sicherheitselement ausgestattetes Wertdokument

Publications (1)

Publication Number Publication Date
EP4311683A1 true EP4311683A1 (fr) 2024-01-31

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EP23020354.9A Pending EP4311683A1 (fr) 2022-07-29 2023-07-25 Élément de sécurité et document de valeur pourvu d'un élément de sécurité

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EP (1) EP4311683A1 (fr)
DE (1) DE102022002765A1 (fr)

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005051675A2 (fr) 2003-11-14 2005-06-09 Printetch Limited Impression
WO2010069823A1 (fr) 2008-12-19 2010-06-24 Basf Se Flocons d'aluminium minces
EP1620602B1 (fr) * 2003-04-28 2010-07-14 Giesecke & Devrient GmbH Element de securite plan et son procede de fabrication
EP1972462B1 (fr) 2007-01-05 2011-05-11 Giesecke & Devrient GmbH Procédé de fabrication de feuilles de sécurité, et feuilles de sécurité
WO2011064162A2 (fr) 2009-11-27 2011-06-03 Basf Se Compositions de revêtement destinées à des éléments de sécurité et à des hologrammes
WO2013186167A2 (fr) 2012-06-14 2013-12-19 Basf Se Procédé destiné à fabriquer des éléments de sécurité et des hologrammes
US20180134062A1 (en) * 2015-04-08 2018-05-17 Leonhard Kurz Stiftung & Co. Kg Method for Producing a Document and a Document
EP3212430B1 (fr) * 2014-10-29 2018-10-24 Giesecke+Devrient Currency Technology GmbH Element de securite avec couche mince a changement de couleur
EP3230081B1 (fr) * 2014-12-09 2019-02-20 Giesecke+Devrient Currency Technology GmbH Élément de sécurité, procédé de production de ce dernier et support de données équipé de l'élément de sécurité
EP3212429B1 (fr) * 2014-10-29 2020-04-29 Giesecke+Devrient Currency Technology GmbH Élément de sécurité pourvu d'un élément à couche mince à effet interférentiel
US20220184992A1 (en) * 2019-04-24 2022-06-16 Zhongchao Special Security Technology Co., Ltd Optical anti-counterfeiting element and manufacturing method thereof

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018008147A1 (de) 2018-10-15 2020-04-16 Giesecke+Devrient Currency Technology Gmbh Sicherheitselement und mit dem Sicherheitselement ausgestatteter Datenträger

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1620602B1 (fr) * 2003-04-28 2010-07-14 Giesecke & Devrient GmbH Element de securite plan et son procede de fabrication
WO2005051675A2 (fr) 2003-11-14 2005-06-09 Printetch Limited Impression
EP1972462B1 (fr) 2007-01-05 2011-05-11 Giesecke & Devrient GmbH Procédé de fabrication de feuilles de sécurité, et feuilles de sécurité
WO2010069823A1 (fr) 2008-12-19 2010-06-24 Basf Se Flocons d'aluminium minces
WO2011064162A2 (fr) 2009-11-27 2011-06-03 Basf Se Compositions de revêtement destinées à des éléments de sécurité et à des hologrammes
WO2013186167A2 (fr) 2012-06-14 2013-12-19 Basf Se Procédé destiné à fabriquer des éléments de sécurité et des hologrammes
EP3212430B1 (fr) * 2014-10-29 2018-10-24 Giesecke+Devrient Currency Technology GmbH Element de securite avec couche mince a changement de couleur
EP3212429B1 (fr) * 2014-10-29 2020-04-29 Giesecke+Devrient Currency Technology GmbH Élément de sécurité pourvu d'un élément à couche mince à effet interférentiel
EP3230081B1 (fr) * 2014-12-09 2019-02-20 Giesecke+Devrient Currency Technology GmbH Élément de sécurité, procédé de production de ce dernier et support de données équipé de l'élément de sécurité
US20180134062A1 (en) * 2015-04-08 2018-05-17 Leonhard Kurz Stiftung & Co. Kg Method for Producing a Document and a Document
US20220184992A1 (en) * 2019-04-24 2022-06-16 Zhongchao Special Security Technology Co., Ltd Optical anti-counterfeiting element and manufacturing method thereof

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