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EP3275685B2 - Papier de sécurité, élément de sécurité et document de valeur - Google Patents

Papier de sécurité, élément de sécurité et document de valeur Download PDF

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Publication number
EP3275685B2
EP3275685B2 EP17001257.9A EP17001257A EP3275685B2 EP 3275685 B2 EP3275685 B2 EP 3275685B2 EP 17001257 A EP17001257 A EP 17001257A EP 3275685 B2 EP3275685 B2 EP 3275685B2
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EP
European Patent Office
Prior art keywords
security
optically variable
fluorescent substance
layer
fluorescent
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.)
Active
Application number
EP17001257.9A
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German (de)
English (en)
Other versions
EP3275685A1 (fr
EP3275685B1 (fr
Inventor
Peter Schiffmann
Axel SCHLOSSBAUER
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
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Application filed by Giesecke and Devrient Currency Technology GmbH filed Critical Giesecke and Devrient Currency Technology GmbH
Publication of EP3275685A1 publication Critical patent/EP3275685A1/fr
Publication of EP3275685B1 publication Critical patent/EP3275685B1/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
    • B42D25/328—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
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/378—Special inks

Definitions

  • the invention relates to a security paper for the production of documents of value, such as banknotes, passports, identification documents or the like, and a document of value comprising the security paper.
  • Security elements for protection are often provided with security elements for protection, which allow the authenticity of the document of value to be checked and at the same time serve as protection against unauthorized reproduction.
  • the security elements can be present, for example, in the form of a security thread that is fully or partially embedded in a bank note, or in the form of a security strip or patch applied to the bank note.
  • security elements in particular security threads, with optically variable security features have become established on the banknote market.
  • Optically variable security features give the viewer a different image impression from different viewing angles.
  • the security features can be present in the form of optically diffractive micro- or nanostructures, such as in the case of conventional embossed holograms or other hologram-like diffraction structures (see, for example, the publications EP 0 330 733 A1 or EP 0 064 067 A1 ).
  • lens systems it is also known to use lens systems as security features.
  • a security thread made of a transparent material, on the surface of which a grid of several parallel cylindrical lenses is embossed.
  • the thickness of the security thread is chosen so that it roughly corresponds to the focal length of the cylindrical lenses.
  • a printed image is applied in register to the opposite surface, the printed image being designed taking into account the optical properties of the cylindrical lenses.
  • moiré magnification arrangements have also been used as security features for some time.
  • Such a moiré magnification arrangement is in the reference WO 2006/087138 A1 or in the DE 10 2005 028162 A1 disclosed. That in the WO 2006/087138 A1 disclosed anti-counterfeiting means has at least a first and a second security feature.
  • the first authenticity feature comprises a first arrangement with a multiplicity of focusing elements which are present in a first grid, and a second arrangement with a multiplicity of microscopic structures which are present in a second grid.
  • the first and second arrays are arranged relative to each other such that the microscopic structures of the second array can be seen in magnification when viewed through the focusing elements of the first array.
  • moiré magnification thereafter refers to a phenomenon that occurs when a grid of identical image objects is viewed through a lenticular array of approximately the same pitch. As with any pair of similar screens, a moire pattern results, in which case each of the moire fringes appears as an enlarged and rotated image of the repeated elements of the image screen.
  • optically variable security features based on periodic or aperiodic sawtooth gratings (see, for example, WO 2011/066991 A2 ).
  • Securities can be provided with a dirt-repellent protective layer to extend their service life and fitness for circulation.
  • a dirt-repellent protective layer to extend their service life and fitness for circulation.
  • a protective layer containing mostly cellulose ester or cellulose ether and to a lesser extent micronized wax and which is applied over the entire surface of the banknotes.
  • the micronized wax is thereby dispersed by dispersing or mixing with oil, a binder or a mixture thereof.
  • the sheets freshly printed with the protective layer can be stacked without difficulty, without ink rubbing off from one sheet onto the sheet below.
  • Another dirt-repellent layer which is based on a UV coating, for example, is from the WO 2004/072378 A1 known.
  • the document DE 10 2004 053007 A1 discloses a security paper according to the preamble of claim 1.
  • the object of the invention is to avoid the disadvantages of the prior art and in particular to specify a security paper and an optically variable security element, with a chemically stable fluorescent feature being present in the area of the optically variable security feature.
  • the structure developing the optically variable effect is a multi-layer thin-layer element, the color impression of which changes for the observer with the viewing angle.
  • a thin-film element has, for example, a semi-transparent absorber layer, a dielectric spacer layer and a reflection layer.
  • a large number of different color-shift effects can be designed by a suitable choice of material and thickness, in particular of the dielectric spacer layer.
  • SiO2 or Al2O3, for example, are suitable as a dielectric spacer layer.
  • the reflection layer of the thin-film element is preferably formed by an opaque or a semi-transparent metal layer, preferably by an opaque or a semi-transparent aluminum layer. In principle, however, other metals such as silver, nickel, copper, iron, chromium, gold or other highly reflective materials can also be considered.
  • the semi-transparent absorber layer can be formed by a chromium layer, for example.
  • fluorescent nanopigments are used as fluorescent substances, the particle size of which is less than 1 ⁇ m, preferably less than 0.5 ⁇ m. Due to the small particle size, optical scattering effects are avoided.
  • fluorescent dyes are preferably used, which are dissolved in a suitable solvent and then applied to an inorganic carrier, the inorganic carrier being based on particles in the nanometer range (hereinafter also referred to as inorganic, nanoscale carrier).
  • the inorganic, nanoscale carrier can in particular be calcium carbonate, a silicate, an aluminum silicate or aluminum hydroxide.
  • fluorescent dyes are used as fluorescent substances, which are dissolved as completely as possible in the solvent of a printing ink.
  • thermally sublimable fluorescent dyes eg Tinopal OB CO
  • a paint e.g. Tinopal OB CO
  • This color is applied, eg printed, to a transparent receiver layer.
  • the sublimable fluorescent dye dispersed or dissolved in the printing ink is then caused to diffuse into the receiver layer and penetrate into the polymer of the receiver layer and be stored there by means of a brief, high temperature.
  • a non-scattering, fluorescent printing feature can be provided above the optically variable security element.
  • the fluorescent print layer In order to obtain the required chemical resistance, it is advisable to provide the fluorescent print layer with a suitable coating.
  • the coating In the case of an optically variable security element based on a film substrate, the coating should be present at least on the upper side of the security element. In the case of a paper substrate, the coating should preferably be both above and below the fluorescent print layer. In order to sufficiently protect the fluorescent print layer from lateral attack by chemicals, it is advantageous to design the protective coating in such a way that the coating overlaps the fluorescent print layer.
  • the fluorescer is a solvent-soluble luminescent, e.g., fluorescent or phosphorescent, dye.
  • the fluorescent substance is a dye that can be excited in the UV range and emits in the visible spectral range.
  • the fluorescent substance is a dye that can be excited in the visible spectral range and emits in the visible spectral range.
  • the fluorescent substance is a dye which emits in the IR range.
  • the fluorescent substance is preferably an organic substance or an organometallic complex.
  • UV-excitable fluorescent dyes are organic fluorescent dyes or fluorescent metal complexes.
  • Possible classes of dyes are, for example, cyanines, rhodamines, oxazines, phenoxazines, thiazines, phenothiazines, perylenes, terylenes, coumarins, benzoxazinones or benzothiazines and rare earth metal complexes, for example beta-diketonate complexes or dipicolinate complexes and their derivatives, preferably neutrally charged rare earth metal complexes.
  • Other classes of organic dyes can also be used.
  • Such fluorescent dyes are commercially available from Honeywell, for example, under the brand name Lumilux, for example Lumilux Red CD 335, Lumilux Yellow CD 397 or Lumilux Blue CD 312.
  • suitable substances that can be excited in the visible spectral range and emit in the visible spectral range are, for example, organic fluorescent dyes or fluorescent metal complexes.
  • fluorescent dyes from the classes of cyanines, rhodamines, oxazines, phenoxazines, thiazines, phenothiazines, perylenes, terylenes, coumarins, benzoxazinones or benzothiazines and rare earth metal complexes such as beta-diketonate complexes or dipicolinate complexes, preferably neutrally charged rare earth metal complexes.
  • Perylene dyes are preferably used because of their high light stability. Perylene dyes are commercially available from companies such as BASF, e.g. under the brand name Lumogen, e.g. Lumogen F Orange 240.
  • suitable infrared-emitting fluorescent substances are, for example, organic fluorescent dyes or fluorescent metal complexes, for example IR-1048, Cy7 or Nd(TTA)3 (neodymium tristhenoyl trifluoroacetonate).
  • Banknote papers are typically made from fibers from annual plants, in particular cotton fibers or cellulose fibres, but papers which consist at least partly of plastic fibres, preferably of polyamide fibers or polyester fibres, can also be used.
  • a cotton paper is particularly preferably used as the security paper substrate.
  • the basis weight of the substrate varies depending on the application. Customary basis weights are in the range from 50 g/m 2 to 100 g/m 2 , preferably in the range from 60 g/m 2 to 90 g/m 2 , particularly preferably around 70 g/m 2 ⁇ 2>.
  • the individual paper layers can consist of the same or different types of paper.
  • one layer of paper can be pure cotton paper, while another layer of paper has plastic fibers.
  • multi-layer paper/foil composites can also be used as the security paper substrate, such as a paper/foil/paper composite or a foil/paper/foil composite.
  • the production preferably takes place by means of a cylinder mold machine.
  • the security paper in the present case a security paper for the production of banknotes, contains a paper substrate 1, a heat-sealing lacquer layer 2, a barrier lacquer layer 3, an embossing lacquer layer 4, e.g. a UV lacquer with an embossed surface relief, a metallization 5 (which can alternatively also be a metallic printing layer can be formed), a first, lower protective coating 6, a fluorescent printing layer 7 and a second, upper protective coating 8.
  • the second, upper protective coating 8 can additionally contain hydrophobic additives or oligomers in the formulation in order to avoid or reduce the wetting of test reagents or test chemicals.
  • layers 6 and 8 can each consist of two or more individual layers. In this way, faults that can be traced back to defects (e.g. bubbles in the paint) within a single layer can be avoided.
  • the security element is applied to the paper substrate 1 by means of the adhesive layer 2 .
  • the second, upper protective coating 8 it is alternatively possible for the second, upper protective coating 8 to be printed onto the fluorescent printed layer 7 as a separate layer after the application of the security element (with the layers 2 to 7).
  • the second, upper protective coating 8 can additionally contain a UV absorber which absorbs in part of the UV range, e.g. in the short-wave UV range.
  • the first, lower protective coating 6 can alternatively be applied below the metallization 5 or below the embossing lacquer layer 4 in order to also protect these layers from the influence of test chemicals.
  • FIG. 2 shows a schematic representation of the security paper 1 in top view.
  • the 2 makes it clear that the second, upper protective coating 8 advantageously completely envelops the fluorescent printed layer 7, so that a lateral attack, for example in the area of a cut edge, by the test chemical is also prevented.
  • the reference number 9 designates a metallization. Areas 11 made of a fluorescent printed layer are present above the metallization 9 .
  • the reference number 10 designates a protective coating placed over the metallization 9 and over the regions 11 of fluorescent printing layer.
  • the dashed lines 12 indicate cutting lines for cutting the individual security strips or security threads 13, 14 and 15.
  • the protective coating 10 also protects the sensitive, fluorescent print 11 in the area of the cutting edges 12 produced by cutting the individual security strips 13, 14 and 15 to size.
  • the individual security strips 13, 14 and 15 each have a film substrate, e.g. a polyester film. For this reason it is not absolutely necessary to provide a further protective coating below the areas 11 made of a fluorescent printed layer 11 .
  • FIG. 4 shows a schematic representation of a further security paper 16, in the present case a bank note with the denomination "20”, in top view.
  • the reference numeral 17 designates a so-called window thread which is partially embedded in the paper substrate of the banknote 16, the areas 18 being visually recognizable to the viewer.
  • the window thread 17 has a fluorescent printed layer on its surface.
  • Banknote 16 was subsequently provided with a protective coating in area 19.
  • the areas of the bank note 16 adjoining the area 19 can optionally be provided with a special dirt-repellent coating.
  • a full-surface dirt-repellent coating can also be produced over the entire bank note 16 afterwards.
  • the protective coating 19 itself can also have a dirt-repellent effect.
  • figure 5 shows a schematic cross-sectional view of a security element with a film substrate 20, an embossing lacquer layer 21, a metallization 22, an optically non-scattering, fluorescent printing feature 23 and an optically scattering, fluorescent printing feature 24.
  • the embossing lacquer layer 21 and the metallization 22 together form one hologram layer.
  • the optically scattering, fluorescent print feature 24 is based on organic or inorganic pigments 25 with particle sizes in the micrometer range present in a binder. Optical scattering effects occur due to the large particle size, as is symbolized by the arrows 28 . As a result of the optically scattering fluorescent ink printed on the hologram layer (21, 22), matting effects occur in the area of the printing feature 24 and the hologram thus has a loss of brightness.
  • the optically non-scattering, fluorescent printing feature 23 is based, for example, on fluorescent nanopigments 26 present in a binder. Due to the small particle size, no visually visible, optical scattering effects whatsoever result. In the area of the print feature 23, the hologram layer (21, 22) therefore shows no matting effect and no loss of brightness.
  • Figures 7 and 8 show an example for the production of a security paper according to the invention, namely the functioning of thermally sublimable luminescent substances in the cross section of a layer sequence.
  • the Indian figure 7 The layer structure shown contains a paper substrate 29, a lower protective coating 30, which can also act as a barrier layer for the sublimable fluorescent dye, a receiver layer 31 for receiving the sublimable fluorescent dye after heat mobilization, a fluorescent print layer 32, which contains a dissolved or dispersed sublimable fluorescent dye, and an upper protective coating 33 which can also act as a barrier layer for the sublimable fluorescent dye.
  • the sublimable fluorescent dye contained in the fluorescent printing layer 32 is shown with black dots.
  • figure 8 shows the layer structure after thermal activation.
  • the receiver layer is provided with the gaseous materials absorb and bind fluorescent substances after the temperature increase. This is possible, for example, with polymer fibers in the coating, eg nylon.

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  • Credit Cards Or The Like (AREA)
  • Paper (AREA)

Claims (12)

  1. (a) Papier de sécurité destiné à la fabrication de documents de valeur,
    (b) comprenant un substrat de papier de sécurité équipé d'un élément de sécurité (2-8) optiquement variable,
    c) cependant que l'élément de sécurité optiquement variable comporte une structure (4, 5) déployant un effet optiquement variable,
    d) cependant que la structure déployant l'effet optiquement variable se trouve dans une couche de vernis de gaufrage (4) et est une structure en relief,
    (e) et la structure déployant l'effet optiquement variable est imprimée avec une substance (7) fluorescente n'affectant pas l'effet optiquement variable,
    f) et l'élément de sécurité optiquement variable comporte un vernis de protection (6, 8) transparent améliorant la stabilité chimique de la substance fluorescente,
    caractérisé en ce que
    g) la substance fluorescente est mise à disposition sur la face de la structure tournée vers l'observateur du papier de sécurité,
    cependant que la structure déployant un effet optiquement variable, pourvue de la substance (7) fluorescente, est une structure en relief et peut être obtenue en ce que la structure en relief est pourvue d'une couche réceptrice transparente basée sur un polymère, la couche réceptrice est imprimée avec une encre d'impression contenant un colorant fluorescent thermiquement sublimable, et le colorant fluorescent thermiquement sublimable contenu dans l'encre d'impression pénètre dans la couche réceptrice au moyen d'une diffusion engendrée par une augmentation de température, afin de s'y déposer.
  2. Papier de sécurité selon la revendication 1, cependant que la structure déployant l'effet optiquement variable représente une structure diffractive telle que par exemple 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, un agencement de micromiroirs, un réseau blazé ayant un profil à sillons en dents de scie ou un agencement de lentilles de Fresnel.
  3. Papier de sécurité selon la revendication 1, cependant que la structure déployant l'effet optiquement variable est un élément multicouche en couche mince dont l'impression de couleur change pour l'observateur en fonction de l'angle d'observation.
  4. Papier de sécurité selon une des revendications de 1 à 3, cependant que le vernis de protection transparent améliorant la stabilité chimique de la substance fluorescente est un vernis UV
  5. Papier de sécurité selon la revendication 4, cependant que le vernis UV est un vernis UV séchant par voie radicalaire qui est de préférence basé sur un oligomère polybutadiène uréthane acrylate.
  6. Papier de sécurité selon une des revendications de 1 à 5, cependant que le vernis de protection transparent améliorant la stabilité chimique de la substance fluorescente contient en plus un additif hydrophobe choisi parmi le groupe consistant en cires, fluorosilanes et silicones, de telle sorte que la mouillabilité du vernis de protection est évitée avec un produit chimique de test, et le produit chimique de test est choisi parmi le groupe consistant en solutions aqueuses, alcools et hydrocarbures chlorés.
  7. Papier de sécurité selon une des revendications de 1 à 6, cependant que le vernis de protection transparent améliorant la stabilité chimique de la substance fluorescente constitue la couche supérieure de l'élément de sécurité optiquement variable.
  8. Papier de sécurité selon une des revendications de 1 à 6, cependant que le vernis de protection transparent améliorant la stabilité chimique de la substance fluorescente constitue la couche avant-supérieure de l'élément de sécurité optiquement variable, et la couche supérieure de l'élément de sécurité optiquement variable est une couche de protection transparente repoussant la saleté et/ou augmentant la résistance aux rayures.
  9. Papier de sécurité selon la revendication 8, cependant que le vernis de protection transparent améliorant la stabilité chimique de la substance fluorescente et/ou la couche de protection transparente repoussant la saleté et/ou augmentant la résistance aux rayures contient additionnellement un absorbeur UV qui absorbe de l'énergie dans une zone partielle du spectre UV, l'absorbeur UV consistant de préférence en un HALS absorbant essentiellement de la lumière UV dans la plage de longueurs d'onde courtes UV
  10. Papier de sécurité selon une des revendications de 1 à 9, cependant que le vernis de protection transparent améliorant la stabilité chimique de la substance fluorescente est appliqué à pleine surface sur le substrat de papier de sécurité équipé de l'élément de sécurité optiquement variable.
  11. Papier de sécurité selon une des revendications de 1 à 10, cependant que la substance fluorescente n'affectant pas l'effet optiquement variable est, en plus du vernis de protection transparent améliorant la stabilité chimique de la substance fluorescente, protégé par un autre vernis de protection transparent améliorant la stabilité chimique de la substance fluorescente, de telle sorte que la substance fluorescente est protégée sur ses deux faces, c'est à dire au-dessus et au-dessous, par deux couches distinctes de vernis de protection.
  12. Document de valeur comprenant le papier de sécurité selon une des revendications de 1 à 11.
EP17001257.9A 2016-07-25 2017-07-21 Papier de sécurité, élément de sécurité et document de valeur Active EP3275685B2 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102016009024.3A DE102016009024A1 (de) 2016-07-25 2016-07-25 Sicherheitspapier, Sicherheitselement und Wertdokument

Publications (3)

Publication Number Publication Date
EP3275685A1 EP3275685A1 (fr) 2018-01-31
EP3275685B1 EP3275685B1 (fr) 2019-09-18
EP3275685B2 true EP3275685B2 (fr) 2023-07-19

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ID=59399206

Family Applications (1)

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EP17001257.9A Active EP3275685B2 (fr) 2016-07-25 2017-07-21 Papier de sécurité, élément de sécurité et document de valeur

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EP (1) EP3275685B2 (fr)
DE (1) DE102016009024A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022001450A1 (de) 2022-04-26 2023-10-26 Giesecke+Devrient Currency Technology Gmbh Foliensicherheitselement und Datenträger mit Foliensicherheitselement
CN118810265A (zh) * 2024-07-01 2024-10-22 广东君成印刷科技有限公司 一种多重防伪标签印刷方法

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