EP3802142A1 - Effect pigment, printing ink, security element, data carrier and production method - Google Patents
Effect pigment, printing ink, security element, data carrier and production methodInfo
- Publication number
- EP3802142A1 EP3802142A1 EP19729441.6A EP19729441A EP3802142A1 EP 3802142 A1 EP3802142 A1 EP 3802142A1 EP 19729441 A EP19729441 A EP 19729441A EP 3802142 A1 EP3802142 A1 EP 3802142A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- platelet
- substrate
- layer
- security element
- effect pigment
- 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
Links
- 239000000049 pigment Substances 0.000 title claims abstract description 66
- 238000007639 printing Methods 0.000 title claims abstract description 32
- 230000000694 effects Effects 0.000 title claims abstract description 15
- 238000004519 manufacturing process Methods 0.000 title claims description 14
- 230000005291 magnetic effect Effects 0.000 claims abstract description 73
- 239000000758 substrate Substances 0.000 claims description 28
- 239000002245 particle Substances 0.000 claims description 18
- 239000011230 binding agent Substances 0.000 claims description 13
- 230000003287 optical effect Effects 0.000 claims description 9
- 238000005516 engineering process Methods 0.000 claims description 6
- 238000003848 UV Light-Curing Methods 0.000 claims description 5
- 230000001419 dependent effect Effects 0.000 claims description 5
- 230000005855 radiation Effects 0.000 claims description 5
- 230000005294 ferromagnetic effect Effects 0.000 claims description 4
- 239000003302 ferromagnetic material Substances 0.000 claims description 4
- 238000000227 grinding Methods 0.000 claims description 4
- 229920001187 thermosetting polymer Polymers 0.000 claims description 4
- 229910000531 Co alloy Inorganic materials 0.000 claims description 3
- 229910010169 TiCr Inorganic materials 0.000 claims description 3
- QJVKUMXDEUEQLH-UHFFFAOYSA-N [B].[Fe].[Nd] Chemical compound [B].[Fe].[Nd] QJVKUMXDEUEQLH-UHFFFAOYSA-N 0.000 claims description 3
- KPLQYGBQNPPQGA-UHFFFAOYSA-N cobalt samarium Chemical compound [Co].[Sm] KPLQYGBQNPPQGA-UHFFFAOYSA-N 0.000 claims description 3
- 239000002131 composite material Substances 0.000 claims description 3
- 238000009826 distribution Methods 0.000 claims description 3
- 239000002902 ferrimagnetic material Substances 0.000 claims description 3
- 229910001172 neodymium magnet Inorganic materials 0.000 claims description 3
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 3
- 150000002910 rare earth metals Chemical class 0.000 claims description 3
- 229910000938 samarium–cobalt magnet Inorganic materials 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 2
- 229920000642 polymer Polymers 0.000 claims description 2
- 229920000307 polymer substrate Polymers 0.000 claims description 2
- 238000007650 screen-printing Methods 0.000 claims description 2
- 229910003271 Ni-Fe Inorganic materials 0.000 claims 1
- 230000005415 magnetization Effects 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 239000010409 thin film Substances 0.000 description 4
- 229910000599 Cr alloy Inorganic materials 0.000 description 2
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 description 2
- 239000000969 carrier Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 241001282736 Oriens Species 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000005293 ferrimagnetic effect Effects 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000005381 potential energy Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000011514 reflex Effects 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000009281 ultraviolet germicidal irradiation Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102018004434.4A DE102018004434A1 (en) | 2018-06-05 | 2018-06-05 | Effect pigment, printing ink, security element, data carrier and manufacturing process |
PCT/EP2019/000172 WO2019233625A1 (en) | 2018-06-05 | 2019-05-28 | Effect pigment, printing ink, security element, data carrier and production method |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3802142A1 true EP3802142A1 (en) | 2021-04-14 |
Family
ID=66810750
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19729441.6A Pending EP3802142A1 (en) | 2018-06-05 | 2019-05-28 | Effect pigment, printing ink, security element, data carrier and production method |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3802142A1 (en) |
DE (1) | DE102018004434A1 (en) |
WO (1) | WO2019233625A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2021104666A1 (en) | 2019-11-27 | 2021-06-03 | Giesecke+Devrient Currency Technology Gmbh | Effect pigment, production method, value document and printing ink |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4439455A1 (en) | 1994-11-04 | 1996-05-09 | Basf Ag | Process for the production of coatings with three-dimensional optical effects |
EP1239307A1 (en) | 2001-03-09 | 2002-09-11 | Sicpa Holding S.A. | Magnetic thin film interference device |
US20020160194A1 (en) * | 2001-04-27 | 2002-10-31 | Flex Products, Inc. | Multi-layered magnetic pigments and foils |
US6808806B2 (en) * | 2001-05-07 | 2004-10-26 | Flex Products, Inc. | Methods for producing imaged coated articles by using magnetic pigments |
TWI292773B (en) | 2001-05-09 | 2008-01-21 | Merck Patent Gmbh | Effect pigments based on coated glass flakes |
RU2294949C1 (en) * | 2005-12-28 | 2007-03-10 | Московский инженерно-физический институт (государственный университет) | Printing ink for protection of products against falsification |
US10343436B2 (en) * | 2006-02-27 | 2019-07-09 | Viavi Solutions Inc. | Security device formed by printing with special effect inks |
DK2484455T3 (en) * | 2011-02-07 | 2015-03-09 | Sicpa Holding Sa | A device for displaying a dynamic visual movement effect and process for producing same |
DE102011116494A1 (en) * | 2011-10-20 | 2013-04-25 | Giesecke & Devrient Gmbh | Method for producing an optically variable security element with microcapsule-based ink layer |
US10933442B2 (en) * | 2013-12-13 | 2021-03-02 | Sicpa Holding Sa | Processes for producing effects layers |
TW201703879A (en) * | 2015-06-02 | 2017-02-01 | 西克帕控股有限公司 | Processes for producing optical effects layers |
CN105136811B (en) * | 2015-09-16 | 2018-03-06 | 西安印钞有限公司 | OVMI optics gradual change magnetic ink printing product on-line detecting system and method |
EP3421551A1 (en) | 2017-06-28 | 2019-01-02 | Andres Ruiz Quevedo | Effect pigment |
-
2018
- 2018-06-05 DE DE102018004434.4A patent/DE102018004434A1/en not_active Withdrawn
-
2019
- 2019-05-28 EP EP19729441.6A patent/EP3802142A1/en active Pending
- 2019-05-28 WO PCT/EP2019/000172 patent/WO2019233625A1/en unknown
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2021104666A1 (en) | 2019-11-27 | 2021-06-03 | Giesecke+Devrient Currency Technology Gmbh | Effect pigment, production method, value document and printing ink |
Also Published As
Publication number | Publication date |
---|---|
WO2019233625A1 (en) | 2019-12-12 |
DE102018004434A1 (en) | 2019-12-05 |
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