WO2019233625A1 - Pigment à effet, encre d'impression, élément de sécurité, support de données et procédé de fabrication - Google Patents

Pigment à effet, encre d'impression, élément de sécurité, support de données et procédé de fabrication Download PDF

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Publication number
WO2019233625A1
WO2019233625A1 PCT/EP2019/000172 EP2019000172W WO2019233625A1 WO 2019233625 A1 WO2019233625 A1 WO 2019233625A1 EP 2019000172 W EP2019000172 W EP 2019000172W WO 2019233625 A1 WO2019233625 A1 WO 2019233625A1
Authority
WO
WIPO (PCT)
Prior art keywords
platelet
substrate
layer
security element
effect pigment
Prior art date
Application number
PCT/EP2019/000172
Other languages
German (de)
English (en)
Inventor
Tobias Sattler
Jörg Anders
Maik Rudolf Johann Scherer
Kai Hermann SCHERER
Raphael DEHMEL
Christian Fuhse
Michael Rahm
Thomas Mang
Original Assignee
Giesecke+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+Devrient Currency Technology Gmbh filed Critical Giesecke+Devrient Currency Technology Gmbh
Priority to EP19729441.6A priority Critical patent/EP3802142A1/fr
Publication of WO2019233625A1 publication Critical patent/WO2019233625A1/fr

Links

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
    • B42D25/369—Magnetised or magnetisable materials

Definitions

  • the invention relates to a platelet-shaped magnetic effect pigment for use in a printing ink, a printing ink, a security element for securing a value document or a valuable article, a data carrier, in particular a banknote, and methods for producing the effect pigment and the security element.
  • Data carriers such as valuables or identity documents, or other items of value, such as branded articles, are often provided with security elements for securing purposes, which permit a verification of the authenticity of the data carriers and at the same time serve as protection against unauthorized reproduction.
  • Security elements with viewing-angle-dependent effects play a special role in the authentication of authenticity since they can not be reproduced even with the very latest copiers.
  • the security elements are thereby equipped with optically variable elements which give the viewer a different image impression under different viewing angles and, for example, depending on the viewing angle, show a different color or brightness impression and / or another graphic motif.
  • Thin-film systems which produce a viewing angle-dependent color impression on the viewer by means of interference are known in the prior art.
  • This optical effect can serve as an optically variable security element.
  • a large-scale thin-film system can be comminuted by various techniques.
  • the size of the resulting flakes or platelets can be laterally up to a few micrometers, but the size is usually in a range of 2gm to lOOmih.
  • the vertical structure of a platelet is given by the requirements of the inter ference layers and is usually as thin as possible, eg in a range of 200 nm to 800 nm.
  • Such platelets are used, for example, in optically variable color (so-called OVI® color), which serves to provide a security element.
  • the pigment platelets have a magnetic moment.
  • Magnetically orienable effect pigments are e.g. commercially available under the trade name OVMI® from SICPA (the abbreviation OVMI stands for the term "optically variable magnetic ink”.)
  • the pigments typically have a platelet-like structure and are in the form of a layer composite which often comprises two layers of optical effect layers With regard to the optical effect layers, metallic-reflecting layers as well as color-shifting layer systems, eg with an absorber, are used
  • the embedded magnetic layer is usually not visible, but is required to align the pigments.
  • the magnetic pigments can rotate about axes parallel to their magnetization with the symbol "m” arranged perpendicular to the normal vector of the thin films Pigments in one direction are substantially uniform while being essentially randomly distributed in another direction, thus not always showing a color surface of the pigment upwards (see attached Figure 2) .
  • the object of the present invention is to provide a method by which the control over the arrangement of the magnetic color pigments can be improved to allow a more attractive optical effect in this way.
  • Platelet-shaped magnetic effect pigment according to Clause 2 wherein at least one reflective layer, preferably each of the two reflective layers, additionally with a translucent color layer or with an interference layer or with at least one further layer, which is used to produce a multilayer interference layer arrangement is combined. 4.
  • Security element for securing a value document or a valuable article obtainable by printing technology applying the ink according to one of the clauses 7 to 9 on a substrate.
  • Security element according to clause 10 wherein the printing substrate is a value document substrate, preferably a paper substrate, a polymer substrate, a paper / polymer composite substrate or a paper-like substrate. 12. (Preferred embodiment) A security element according to clause 10 or 11, wherein for the viewer when viewing the security element, a viewing angle-dependent optical effect is perceptible based on the fixed in an external magnetic field and fixed in the cured binder pigments.
  • step of crushing e.g. by grinding until particles having an adequate size distribution are obtained;
  • a method of manufacturing the security element according to any one of clauses 10 to 13, comprising printing by applying the ink according to any one of clauses 7 to 9 to a printing material, wherein in the step of printing applying the ink external magnetic field is applied and the color is cured, preferably by UV radiation or by heat, so that the particles become immobile.
  • FIG. 1 shows the possible magnetization (with the symbol “m") of an OVMI® pigment and the consequent orientation of the pigment in a magnetic field (with the symbol “H”);
  • Figure 2 shows possible alignments of an OVMI® pigment in the magnetic field (with the symbol “H”) by a rotation about an axis with the symbol “m”;
  • FIG. 3 shows the rotation of the OVMI® pigment around the surface normal in the case of a magnetization that is parallel to the surface normal; At the same time, the intensity of the optical reflex does not change.
  • the present invention is a printing technology available security element based on platelet-shaped magnetic advisingpigmen th whose magnetic moment is aligned substantially perpendicular to the platelet plane.
  • the magnetic pigments according to the invention can be oriented in a static external magnetic field so that their magnetic moments are substantially parallel to the magnetic field lines.
  • the platelets can rotate about an axis which is arranged parallel to its magneti's moment, without changing their potential energy in the magnetic field.
  • Mag netpigmenten rotation in the case of the pigments of the invention, however, has no significant influence on the reflection properties of the Pig ments. The reflection properties can therefore be better controlled who the.
  • the viewer sees a large number of small pigments each having a substantially random brightness. Consequently, the security elements obtained in this way have a granular or a so-called "noisy" optical texture, whereas homogeneous pigments can be produced by means of the pigments according to the invention.
  • a layer structure is he testifies, wherein the layer structure has a arranged between two reflective layers magnetic layer.
  • the reflective ones Layers can additionally be combined with translucent colors or with interference layers (or with further layers which lead to the generation of a multi-layer interference layer arrangement).
  • the layer structure is detached from the carrier substrate and, if appropriate, comminuted, for example by means of grinding, until particles with an adequate size distribution are obtained.
  • the resulting particles may be mixed with a UV-curing binder to form a screen printing ink.
  • an external magnetic field is expediently applied and the color cured, for example, by UV radiation or by primagon effect, so that the particles are immobile.
  • This layer is magnetized by means of an external magnetic field perpendicular to the layer plane.
  • the layers and / or pigments may only be exposed to external magnetic fields whose field strength is significantly lower than the coercive field strength of the magnetic layer.
  • Second preferred production method A ferromagnetic or ferrimagnetic material having a very high coercive force is comminuted by grinding until a particle size of less than 10 mpi, preferably less than Impi, is obtained.
  • the powder is introduced into a liquid medium which can be solidified in a controlled manner, and the mixture is applied to a carrier substrate.
  • the particles are then aligned by means of an external magnetic field so that their magnetization direction is arranged in each case perpendicular to the substrate plane, and the liquid medium is solidified, so that the particles are immobile and the magnetization of the layer is so to speak frozen.
  • an external magnetic field it may be advantageous to increase the temperature of the layer for a short time significantly and / or to exert a high pressure on the material.
  • the layers and / or pigments may only be exposed to magnetic fields whose field strength is significantly lower than the coercive field strength of the magnetic layer.
  • a magnetic layer is formed of such a material in which the shape anisotropy is not dominant and the magnetic moment is preferably perpendicular to the layer plane.
  • the above-described first preferred manufacturing method and the second preferred manufacturing method are each based on the prior art production of rare earth magnets, e.g. Neodymium iron boron or samarium cobalt.
  • the above-described third preferred manufacturing method is based on the well-known in the art manufacturing a hard disk or hard disk (ie, a magnetic storage medium of computer technology), in the Examples of materials which can be used are, inter alia, Co / Cr alloys or layer structures based on the configuration NiFe / TiCr / CoCr-TaPt deposited on an Al / NiP substrate. Substrate, for example, by sputtering.
  • the use of the particles according to the invention makes it possible to realize optically variable patterns, the surfaces produced in this way having an extremely homogeneous and brilliant effect compared to the patterns known in the prior art.
  • novel patterns can be produced which can not be realized on the basis of the pigments known hitherto in the art, e.g. Micromirror bulging effects.
  • the particles according to the invention can additionally be mixed with particles according to the prior art. When the resulting mixture is exposed to an external magnetic field, the principal planes of the two types of particles are locally perpendicular to each other, so that the pattern produced in this way is visible from widely different viewing angles.
  • the two particle types can have a different coloration, so that a color change can be made visible.

Landscapes

  • Credit Cards Or The Like (AREA)
  • Inks, Pencil-Leads, Or Crayons (AREA)

Abstract

L'invention concerne un pigment à effet magnétique en forme de plaquette destiné à être utilisé dans une encre d'impression. Le pigment à effet présente un couple magnétique orienté sensiblement de manière perpendiculaire par rapport au plan de plaquette.
PCT/EP2019/000172 2018-06-05 2019-05-28 Pigment à effet, encre d'impression, élément de sécurité, support de données et procédé de fabrication WO2019233625A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP19729441.6A EP3802142A1 (fr) 2018-06-05 2019-05-28 Pigment à effet, encre d'impression, élément de sécurité, support de données et procédé de fabrication

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018004434.4 2018-06-05
DE102018004434.4A DE102018004434A1 (de) 2018-06-05 2018-06-05 Effektpigment, Druckfarbe, Sicherheitselement, Datenträger und Herstellungsverfahren

Publications (1)

Publication Number Publication Date
WO2019233625A1 true WO2019233625A1 (fr) 2019-12-12

Family

ID=66810750

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2019/000172 WO2019233625A1 (fr) 2018-06-05 2019-05-28 Pigment à effet, encre d'impression, élément de sécurité, support de données et procédé de fabrication

Country Status (3)

Country Link
EP (1) EP3802142A1 (fr)
DE (1) DE102018004434A1 (fr)
WO (1) WO2019233625A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220403177A1 (en) * 2019-11-27 2022-12-22 Giesecke+Devrient Currency Technology Gmbh Effect pigment, production method, value document and printing ink

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0710508A1 (fr) 1994-11-04 1996-05-08 Basf Aktiengesellschaft Procédé pour fabriquer des revêtments ayant des effets optiques tri-dimensionnels
WO2002073250A2 (fr) 2001-03-09 2002-09-19 Sicpa Holding S.A. Pigment ou dispositif d'interference en film mince magnetique et son procede de fabrication, encre d'impression ou composition de revetement, document de securite et utilisation d'un tel dispositif
US20020160194A1 (en) * 2001-04-27 2002-10-31 Flex Products, Inc. Multi-layered magnetic pigments and foils
WO2002090002A2 (fr) * 2001-05-07 2002-11-14 Flex Products, Inc. Procedes de production d'articles revetus comportant des images dans lesquels on utilise des pigments magnetiques
US20040134385A1 (en) 2001-05-09 2004-07-15 Ralf Anselmann Effect pigments based on coated glass flakes
RU2294949C1 (ru) * 2005-12-28 2007-03-10 Московский инженерно-физический институт (государственный университет) Типографская краска для защиты продукции от фальсификации
EP1826731A2 (fr) * 2006-02-27 2007-08-29 JDS Uniphase Corporation Dispositif de sécurité formé par l'impression d'encres à effet spécial
EP2484455A1 (fr) * 2011-02-07 2012-08-08 Sicpa Holding Sa Dispositif affichant un effet de mouvement visuel dynamique et son procédé de production
DE102011116494A1 (de) * 2011-10-20 2013-04-25 Giesecke & Devrient Gmbh Verfahren zum Herstellen eines optisch variablen Sicherheitselements mit mikrokapselbasierter Farbschicht
WO2015086257A1 (fr) * 2013-12-13 2015-06-18 Sicpa Holding Sa Procédé de production de couches à effets
CN105136811A (zh) * 2015-09-16 2015-12-09 西安印钞有限公司 Ovmi光学渐变磁性油墨印刷品在线检测***及方法
WO2016193252A1 (fr) * 2015-06-02 2016-12-08 Sicpa Holding Sa Procédés de fabrication de couches à effet optique
EP3421551A1 (fr) 2017-06-28 2019-01-02 Andres Ruiz Quevedo Pigment à effet

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0710508A1 (fr) 1994-11-04 1996-05-08 Basf Aktiengesellschaft Procédé pour fabriquer des revêtments ayant des effets optiques tri-dimensionnels
WO2002073250A2 (fr) 2001-03-09 2002-09-19 Sicpa Holding S.A. Pigment ou dispositif d'interference en film mince magnetique et son procede de fabrication, encre d'impression ou composition de revetement, document de securite et utilisation d'un tel dispositif
US20020160194A1 (en) * 2001-04-27 2002-10-31 Flex Products, Inc. Multi-layered magnetic pigments and foils
WO2002090002A2 (fr) * 2001-05-07 2002-11-14 Flex Products, Inc. Procedes de production d'articles revetus comportant des images dans lesquels on utilise des pigments magnetiques
US20040134385A1 (en) 2001-05-09 2004-07-15 Ralf Anselmann Effect pigments based on coated glass flakes
RU2294949C1 (ru) * 2005-12-28 2007-03-10 Московский инженерно-физический институт (государственный университет) Типографская краска для защиты продукции от фальсификации
EP1826731A2 (fr) * 2006-02-27 2007-08-29 JDS Uniphase Corporation Dispositif de sécurité formé par l'impression d'encres à effet spécial
EP2484455A1 (fr) * 2011-02-07 2012-08-08 Sicpa Holding Sa Dispositif affichant un effet de mouvement visuel dynamique et son procédé de production
DE102011116494A1 (de) * 2011-10-20 2013-04-25 Giesecke & Devrient Gmbh Verfahren zum Herstellen eines optisch variablen Sicherheitselements mit mikrokapselbasierter Farbschicht
WO2015086257A1 (fr) * 2013-12-13 2015-06-18 Sicpa Holding Sa Procédé de production de couches à effets
WO2016193252A1 (fr) * 2015-06-02 2016-12-08 Sicpa Holding Sa Procédés de fabrication de couches à effet optique
CN105136811A (zh) * 2015-09-16 2015-12-09 西安印钞有限公司 Ovmi光学渐变磁性油墨印刷品在线检测***及方法
EP3421551A1 (fr) 2017-06-28 2019-01-02 Andres Ruiz Quevedo Pigment à effet

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Week 200735, Derwent World Patents Index; AN 2007-370077, XP002794187 *
DATABASE WPI Week 201602, Derwent World Patents Index; AN 2015-84148W, XP002794186 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220403177A1 (en) * 2019-11-27 2022-12-22 Giesecke+Devrient Currency Technology Gmbh Effect pigment, production method, value document and printing ink

Also Published As

Publication number Publication date
DE102018004434A1 (de) 2019-12-05
EP3802142A1 (fr) 2021-04-14

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