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EP3501839A1 - Particules de protection contre la contrefaçon - Google Patents

Particules de protection contre la contrefaçon Download PDF

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Publication number
EP3501839A1
EP3501839A1 EP18000778.3A EP18000778A EP3501839A1 EP 3501839 A1 EP3501839 A1 EP 3501839A1 EP 18000778 A EP18000778 A EP 18000778A EP 3501839 A1 EP3501839 A1 EP 3501839A1
Authority
EP
European Patent Office
Prior art keywords
printing
coating
particle
surface areas
particles
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.)
Granted
Application number
EP18000778.3A
Other languages
German (de)
English (en)
Other versions
EP3501839B1 (fr
Inventor
Peter Schiffmann
Martin Imhof
Karlheinz Mayer
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 EP3501839A1 publication Critical patent/EP3501839A1/fr
Application granted granted Critical
Publication of EP3501839B1 publication Critical patent/EP3501839B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • 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
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/378—Special inks
    • 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
    • B42D25/382—Special inks absorbing or reflecting infrared light
    • 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
    • B42D25/387—Special inks absorbing or reflecting ultraviolet light
    • 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
    • B42D25/391—Special inks absorbing or reflecting polarised light

Definitions

  • the invention relates to particles for use in a printing ink or a paint for protection against counterfeiting.
  • the invention also relates to a production process for such particles, as well as a printing ink or a lacquer with such particles.
  • the particles can also be introduced into a plastic body or processed as the core of a capsule.
  • Data carriers such as banknotes, stocks, bonds, certificates, vouchers, checks, high-quality admission tickets, but also other forgery-prone papers, such as passports or other identification documents, as well as product packaging and merchandise security elements for product trademark protection, are often provided with security printing for security, which is a review of Allow the authenticity of the value document and at the same time serve as protection against unauthorized reproduction.
  • a printing ink is applied in which particles or pigments having preselected special properties, for example certain magnetic or luminescent properties, are dispersed.
  • the preselected properties of the particles or pigments are then queried during the authenticity check and serve to confirm the authenticity of the data carrier provided with the security print.
  • the present invention seeks to provide particles of the type mentioned above, on the one hand ensure high protection against counterfeiting and on the other hand, easy and inexpensive, ideally produced in the required in the field of security large-scale.
  • the invention provides an anisotropic printing / coating particle for use in an antifouling printing ink or varnish having at least two separate surface regions having different physical properties, wherein at least one of said surface regions is formed by a coating material and at least one component the particle is formed by a printing material, in particular a printing ink.
  • Janus particles Particularly structured solids with multifunctional properties have been the subject of current research under the name “Janus particles” for some time now.
  • the preparation of such Januspizer currently takes place mostly by phase separation, self-orientation or masking.
  • Janus particles In the production of Janus particles by self-orientation methods for the preparation of block copolymers are used. By self-organization of the polymers, for example at a phase boundary of the coating media, alternating layers of different materials and thus Janus particles can form.
  • the masking is a relatively old and safe method of producing Janus particles.
  • a particle having only a first property is first applied to a carrier medium, which represents the mask for the first property.
  • the second property of the particle is then produced by spraying a liquid, condensation of a gas or by steaming or sputtering, for example with a metal.
  • phase separation fabrication it is difficult to ensure that the phase separation works reliably on an industrial scale and that, even if it works, instead of a Janus particle, two separate particles having the two different properties are produced.
  • the problem is that the particle size is based on the selected substances.
  • a particular difficulty lies in the fact that the application works on a carrier medium in a defined penetration depth and the coating agent does not connect a plurality of particles with one another, so that separation of the particles fails or the coating is peeled off again when the coated particles are detached from the carrier medium ,
  • Another difficulty of all three mentioned methods is the reliable selection of good material. For example, if one of the properties allows magnetic separation, a particle is accepted as good material even if it has only the magnetic property. On the other hand, a selection via the specific weight is only possible if the two material properties differ significantly in specific gravity. The separation is also very complicated, since two passes are required for the selection.
  • Janus particles are currently predominantly produced in research where the limitations of the described methods are often acceptable.
  • the processes are time-consuming, costly and error-prone in particular in their reproducibility, with the result that the particles are often produced only on a milligram or gram scale.
  • the problem is that a defined orientation of the Janus interface to a permanent magnetic magnetization of the particle is hardly or only with difficulty possible.
  • First applications for Janus particles are in the medical field, where usually only small quantities are needed.
  • anisotropic particles having at least two separate surface regions with different physical properties.
  • the anisotropic particles produced in a combination of at least one printing method and at least one coating method are referred to in the context of this application as "printing / coating particles”.
  • the inventors have surprisingly found that with the aid of a suitable combination of printing and coating processes, at least two different substances, namely at least one printing material and at least one coating material, are directly or indirectly connected to one another can be used to create the at least two separate surface areas with different physical properties.
  • the at least one printing material can in particular by continuous ink jet printing, ink jet printing, screen printing, 3D printing, dispenser printing systems (eg DMD100 Kelenn technology) or aerosol printing systems (eg systems from Optomec, Neotech AMT, Fraunhofer IWS Dresden) are applied to an already existing constituent of the particle, for example a carrier constituent of the particle or to an auxiliary carrier (from which the particles are removed after their construction).
  • dispenser printing systems eg DMD100 Kelenn technology
  • aerosol printing systems eg systems from Optomec, Neotech AMT, Fraunhofer IWS Dresden
  • thermoplastic printing inks in particular thermoplastic, UV-crosslinking printing inks.
  • the inkjet printing ink is heated in the area of the print head and thus its viscosity is lowered.
  • the target object the partial particle structure or the auxiliary carrier
  • an abrupt lowering of the temperature leads to an increase in the viscosity so that the ink does not run any further.
  • support layers are preferably printed, which avoid that the applied Janus printing layers run uncontrolled or spread on the auxiliary carrier.
  • the support points can themselves consist of a water-soluble binder such as PVOH or a non-fully curable UV-drying binder (eg by sub-concentration of photoinitiator), so that a detachment For example, with acetone or ethanol is possible.
  • the interpolation points are advantageously generated inline with each applied Janus layer in order to improve the passer situation of the interpolation point to the Janus layer and to avoid defects in the pressure of the Janus layers.
  • the at least one coating material is applied in particular by a contactless coating method, wherein advantageously PVD (Physical Vapor Deposition) methods, CVD (Chemical Vapor Deposition) methods or spray coating methods are used.
  • the applicable PVD methods include, in particular, thermal evaporation, electron beam evaporation, laser beam evaporation, arc evaporation, molecular beam epitaxy, sputtering, ion beam assisted deposition, and ion plating.
  • the material to be evaporated is heated in a ladle by means of a laser, so that it passes into the gaseous phase and condenses inter alia on the substrate to be coated.
  • the vaporized material can be directed ballistically or by electric fields to the substrate to be coated, depending on the method.
  • the coating is carried out in a vacuum at typical working pressures of 10 -4 Pa to about 10 Pa.
  • oxides can also be deposited.
  • the layer thickness of the deposition is dependent inter alia on the amount of evaporated material, the chamber design, the substrate width and the web speed of the substrate.
  • Common materials for vapor deposition are metals such as copper, aluminum, chromium and the like.
  • the CVD methods which can be used in the context of the invention have individual methods which operate in the low-temperature range with reduced pressure ( ⁇ 200 mbar), so that coating is also sensitive to temperature Materials are possible.
  • temperatures from about 150 ° C are currently necessary.
  • the plasma enhanced chemical vapor deposition (PECVD) is also suitable for the coating of temperature-sensitive materials.
  • aluminum can be deposited on materials by reduction of aluminum trichloride and hydrogen.
  • CVD method it is also possible, for example, to form layers from gaseous iron chloride (FeCl 3 ) and water vapor Fe 2 O 3 or to produce a blackening of one side of a particle by means of carbon deposition.
  • SiO 2 coatings are also possible.
  • Spray Coating is a high-pressure spray process in which the coating material is nebulised to produce the finest droplets, which are deposited on the product to be coated as a thin film of material.
  • the drying of the spray film is carried out, for example, by oxidative drying, thermally or photochemically induced.
  • the different printing and coating materials are advantageously matched to one another, overlapping one another, or arranged abutting.
  • the different printing and coating materials are first applied to a subcarrier and are each connected there to an anisotropic printing / coating particles and that the formed anisotropic printing / coating particles are then removed from the subcarrier , and preferably mechanically removed.
  • the mechanical detachment can take place with the aid of a mechanical stripping device, for example by means of a squeegee, brush, air jet or water jet.
  • a stripping by a sharp-edged deflection of the formed in the form of an endless belt subcarrier with a cylinder with a small diameter or a fixed rounded plate is considered.
  • the fixed plate may for example consist of plastic, polished steel, chromed polished steel, Teflon, PTFE or ceramic coated steel.
  • a combination of the mentioned variants is also well suited to detach particles generated from the auxiliary carrier.
  • the tools mentioned can also be supported by an ultrasound application.
  • the variant described above can bring a further Janus property by means of the middle layer produced by printing technology, which does not visually appear.
  • This can be, for example, a magnetic polarity (N / S pole perpendicular to the generated particle upper side.
  • the endless belt is deflected in a bath in which there is a separating liquid which dissolves the particles from the belt.
  • the bath can also be coupled with an ultrasound transmitter or an ultrasound probe be to assist in the separation of the particles from the endless belt.
  • the auxiliary carrier is provided with a solvent-soluble layer.
  • This layer may be water-soluble, for example. Suitable is about PVOH.
  • the said endless belt can also be provided with a shaping die, for example in the form of half shell troughs, in order to define the shape of the printing / coating particles.
  • a shaping die for example in the form of half shell troughs, in order to define the shape of the printing / coating particles.
  • the application of the particles is preferably carried out on a web-shaped auxiliary carrier.
  • an endless belt can be used, which is again fitted or printed after the replacement of the generated Janus particles and an optional additional cleaning process.
  • roll material can be used, which is wound up again after detachment of the generated Januspart and re-equipping is supplied.
  • the roll stock may be cleaned (e.g., offline) and then reused or disposed of.
  • an auxiliary carrier sheet preferably flexible, or a panel, preferably rigid, is used as the carrier material.
  • the process steps are separated as described below: For example, in a first process step, the panels are coated with a release layer, eg by printing, and stacked again after thermal drying. In the second process step, the generation of the Janusparticles takes place. The detachment of the generated Janusparticles then takes place in a third offline process step, as this, for example, requires more time. An optimal cleaning of the panels then takes place in a fourth process step.
  • process steps that are different in speed are combined with switches in an online process or an automated process in such a way that a faster process step is not slowed down by a slow process step.
  • At least one printing material is magnetic and the at least one magnetic printing material is magnetically preoriented after application and before or during its drying or hardening.
  • the output can be arbitrarily scaled up by a parallel production. The typical risks of scalability of processes are eliminated.
  • At least one of said surface areas is advantageously formed by a printing material, in particular a printing ink.
  • the separate surface areas of the particle have the same shape and / or size. In other variants, it may be advantageous to form the separate surface regions of the particle with different shape and / or size, for example, in order to outweigh or even dominate one of the properties of the particle.
  • anisotropic printing / coating particle may basically have any geometric shape, it is presently particularly preferred for the anisotropic printing / coating particle to be platelet-shaped or hemispherical in shape. In addition, spherical, dumbbell-shaped, rod-shaped or cylindrical designs are also considered.
  • the constituent part of the particle formed by said print material constitutes a carrier constituent which defines the spatial shape of the particle.
  • This carrier component does not necessarily have to form one of the mentioned surface areas, but can do this in advantageous embodiments.
  • the carrier component may be filled with a high density filler which allows for gravimetric alignment of the particle. Suitable fillers are, for example, barium sulfate having a density of about 4.5 g / cm 3 and titanium dioxide (4.2 g / cm 3 ) into consideration.
  • the carrier component is transparent and permits the perception of a material region arranged below or above the carrier component with desired physical, in particular visually perceptible or optically detectable properties.
  • the carrier component advantageously comprises a solvent or water-based binder, in particular a UV-crosslinking binder and particularly preferably a UV-drying binder.
  • the constituent part of the particle formed by said pressure substance forms one of said surface areas.
  • the volume fraction of the coating materials is advantageously less than 50%, preferably less than 30%, in particular less than 10% or even less than 5% by volume of the printed matter.
  • At least one coating material advantageously represents a two-dimensional coating of a constituent of the particle, in particular of the carrier constituent, formed by at least one pressurized substance.
  • the anisotropic printing / coating particle advantageously has a maximum extent of 3-70 ⁇ m, preferably 3-50 ⁇ m and particularly preferably 3-30 ⁇ m.
  • the printing / coating particle has a volume below 3.5 ⁇ 10 -13 m 3 , preferably below 1.25 x 10 -13 m 3, and more preferably below 0.3 x 10 -13 m 3 .
  • hemispherical anisotropic printing / coating particles advantageously have a maximum expansion of 1.5-35 .mu.m, preferably of 1.5-25 .mu.m and more preferably of 1.5-15 .mu.m, and correspondingly advantageously have a volume of between 7 .mu.m 3 and 90,000 ⁇ m 3 , preferably between 7 ⁇ m 3 and 32,500 ⁇ m 3 and more preferably between 7 ⁇ m 3 and 7,000 ⁇ m 3 .
  • Platelet-shaped anisotropic printing / coating particles advantageously have a pigment thickness of 1-10 ⁇ m, preferably 1-7 ⁇ m.
  • a circular area expansion of the particles is assumed, the results for other surface forms can then be easily derived.
  • a platelet-shaped particle with a circular disk diameter of 50 ⁇ m has a volume of 5,890 ⁇ m 3 at a thickness of 3 ⁇ m and a volume of 9,820 ⁇ m 3 at a thickness of 5 ⁇ m.
  • a platelet-shaped particle with a circular disk diameter of 70 ⁇ m has a volume of 11,545 ⁇ m 3 at a thickness of 3 ⁇ m and a volume of 19,240 ⁇ m 3 at a thickness of 5 ⁇ m.
  • the density of the particle material is in the range from 0.8 g / cm 3 to 4 g / cm 3 .
  • the anisotropic pressure / coating particle is easily movable and controllable in its spatial orientation, so that in particular the orientation of the separate surface areas can be set as desired.
  • This adjustment can be made permanently, for example by fixing the spatially oriented particles in a surrounding medium.
  • the adjustment can also be reversible, for example by a pressure / coating particle core being movably received in a capsule shell.
  • the anisotropic pressure / coating particle preferably has a magnetic core alignable by an external magnet.
  • an alignment of the particle cores by electric fields in question including the cores, for example, have an electric charge or an electric dipole moment or are sufficiently polarizable.
  • the orientability can be destroyed by a fixation of the printing / coating particles in a printing ink, or, as in the case of the encapsulated printing / coating particles described below, can also be permanently retained.
  • the printing / coating particle has a capsule shell and a carrier fluid enclosed in the capsule shell, in which at least one printing / coating particle core is dispersed, which has at least two separate surface regions with different physical properties and wherein at least one of said surface areas is formed by a coating material and at least one component of the particle core is formed by a printing material, in particular a printing ink.
  • the carrier fluid may also contain a plurality of similar or dissimilar pressure / coating particle cores.
  • the invention also includes a printing ink or anticorrosive paint in which anisotropic printing / coating particles of the type described are dispersed.
  • the invention further comprises an anti-counterfeit article with an applied, in particular printed layer with anisotropic printing / coating particles of the type described.
  • the layer can be produced in particular by using the above-mentioned printing ink or varnish.
  • the counterfeit-protected object may in particular be a value document, such as a banknote, a passport, a document, an identity card or the like, or else a product packaging secured by the particle layer.
  • the article advantageously contains a substrate made of paper, plastic or a paper-plastic hybrid to which the printing / coating particle layer is applied, in particular printed.
  • the pressure / coating particle layer may be combined on the article with further layers of security features, their own shafts advantageously interact with the physical properties of the printing / coating particles.
  • the printing / coating particles can have luminescent properties and be overprinted with a luminescent layer or a layer containing a UV absorber in some areas, resulting in luminescence combined in regions or in regions.
  • the invention also includes a method for producing anisotropic printing / coating particles of the type described, in which at least one printing material with a printing process and at least one coating material are directly or indirectly connected to one another by means of a coating process, with the at least two separate surface regions to produce different physical properties. Any drying or crosslinking of the constituents of the particle formed by printing processes can take place before or after the coating of the constituent.
  • the coating process is in any case not a printing process.
  • the different printing and coating materials are advantageously matched to one another, overlapping one another, or arranged abutting.
  • the different printing and coating materials are applied to a subcarrier and connected there in each case to form an anisotropic printing / coating particles.
  • the formed anisotropic printing / coating particles are then detached from the auxiliary carrier, preferably mechanically removed.
  • a possible Drying or crosslinking of the constituents of the particle formed by printing processes advantageously takes place after the detachment of the particles from the auxiliary carrier.
  • At least one printing material is magnetic and the at least one magnetic printing material is magnetically preoriented after application and before or during its drying or hardening.
  • the preorientation can also be done when applying a coating.
  • the particle has a magnetic core or is itself magnetic, the magnetic core or magnetic orientation advantageously has a fixed orientation to the orientation of the different physical properties of all the Janus particles produced.
  • the magnetic structures of the particles as basically known from the GMR (Giant Magneto Resistance) effect, can be formed in multiple layers with a sequence of magnetic and nonmagnetic thin layers. Such layer sequences have proven to be very resistant to remagnetization.
  • FIG. 1 schematically shows a printing ink 10 with a UV-drying binder 12, in the anisotropic pressure / coating particles 14,16 of two different types are introduced.
  • Each of the first type 14 and second type printing / coating particles 16 has two separate surface areas 14A, 14B, 16A, 16B having different physical properties.
  • the different properties of the surface regions 14A, 14B and 16A, 16B are illustrated in the figures by different or missing hatching of the substances forming the surface regions.
  • the printing / coating particle of the first type 14 is in Fig. 2 shown in more detail, wherein Fig. 2 (a) a cross section, Fig. 2 (b) a view from direction B and Fig. 2 (c) a view from direction C of Fig. 2 (a) shows.
  • the different properties in particular comprise one or more physical properties from the group formed by the surface tension of the surface areas, the specific gravity of the surface area forming materials, the Color of the surface areas, in particular the color spectrum of the surface areas in UV, VIS and / or IR, the magnetic properties of the surface areas or of the surface areas forming materials, the luminescence properties of the surface areas or the surface areas forming materials, the electrical conductivity of the surface areas or the surface area forming materials and the gloss and reflectivity of the surface areas.
  • the surface areas 14A, 14B of the pressure-coating particles 14 in the exemplary embodiment differ in their color in the visible spectral range.
  • surface areas 14A appear red and surface areas 14B blue.
  • the printing / coating particles of the second type 16 are basically constructed like the printing / coating particles of the first type 14 ( Fig. 2
  • the surface areas 16A, 16B of the pressure-coating particles 16 differ in their luminescence properties, for example, the surface areas 16A luminesce after UV excitation green and the surface areas 16B red.
  • the printing / coating particles of the first type 14 consist of two layers 18-1, 18-2 produced by printing technology, each formed by a red-reflecting printing ink.
  • the red-reflecting printing inks used in the production exhibit different rheological and / or surface-physical properties.
  • the printing-technically produced layers 18-1, 18-2 are provided with a coating 18-3 made of a blue-reflecting coating material coated with a coating process, in the exemplary embodiment by physical Gas phase deposition (PVD), is applied to the pressure-technically generated layers 18-1,18-2.
  • PVD physical Gas phase deposition
  • the particles 14 have a diameter (largest dimension) D of about 25 microns, their height H is about 20 microns.
  • the layer thickness of the coating 18-3 is only about 1 ⁇ m, so that the volume fraction of the coating material is very small compared to the volume fraction of the printing ink which forms the layers 18-1 and 18-2.
  • the printing / coating particles 14, 16 have not only the above-mentioned visual properties, but are also magnetic, so that they can be aligned as desired by the external magnetic field during or after the printing of the ink 10 and before the drying of the binder .
  • the magnetic alignability is determined by the magnetic properties of the materials forming the surface regions 14A, 14B, 16A, 16B, namely the above-mentioned printing ink of the layers 18-1, 18-2, the coating material of the coating 18-3, and the corresponding materials Itself provided such that the surface regions 14A and 16A each form a magnetic north pole and the surface regions 14B and 16B each form a south magnetic pole.
  • the magnetic orientability may also be provided by another magnetic material disposed inside the particle. This magnetic material is preferably provided by a printing material.
  • FIG. 3 schematically shows a security substrate 20, such as a banknote, with a through the ink 10 of Fig. 1 formed imprint with regionally different appearance.
  • the printing ink 10 was printed on the substrate 20 and the anisotropic printing / coating particles 14,16 aligned by an external magnetic field so that they are oriented in opposite directions to each other in first and second regions 22, 24.
  • the binder 12 of the printing ink 10 was dried while the magnetic field was still applied by UV irradiation and the set orientation of the printing / coating particles 14,16 thereby permanently fixed.
  • the surface regions 14A, 16A of the printing / coating particles 14, 16 point towards the viewer, so that the first region 22 shows a red color impression in the visible spectral range and green luminescence after UV excitation.
  • the opposing surface areas 14B, 16B of the printing / coating particles 14, 16 lead to the observer, so that this area shows a blue color impression in the visible spectral range and a red luminescence after UV excitation.
  • inventive anisotropic pressure / coating particles will now be described with reference to FIGS FIGS. 4 to 6 described in more detail.
  • the printing / coating particles can be produced, for example, in the manner described in more detail below.
  • a platelet-shaped anisotropic printing / coating particle 30 which consists of a print-engineered carrier component 32 having a first physical property and a coating 34 having a second, different physical property.
  • the carrier component 32 defines the basic shape of the particle 30, which is virtually unchanged by the comparatively thin coating 34.
  • the carrier component 32 and the coating 34 form two surface regions of the particle 30 of different physical Properties off.
  • the diameter D (largest dimension) of the particle 30 is between 3 ⁇ m and 70 ⁇ m, the height H of the particle typically in the range of a few micrometers.
  • substantially hemispherical pressure / coating particles 40 is similar to the particles 14, 16 of Figures 1 to 3 formed and consists of two printing layers 42-1, 42-2, wherein the layer 42-2 with a coating 44 is provided from a coating material.
  • the printing inks used in the production have different rheological and / or surface-physical properties.
  • the first printing-produced layer 42-1 forms a first surface area of the particle 40 with a first physical property
  • the coating 44 of the second pressure-produced layer 42-2 forms the second surface area with a second, different physical property.
  • the second print-produced layer 42-2 is transparent in this embodiment and / or has a different physical property from the first layer 42-1.
  • the substantially hemispherical pressure / coating particle 50 shown in cross-section is similar to the particles 14, 16 of FIGS. 1 to 3 formed and consists of two printing technology generated layers 52-1, 52-2, wherein the layer 52-2 is provided with a coating 54 of a coating material.
  • the printing inks used in the production have different rheological and / or surface-physical properties.
  • the first print-produced layer 52-1 is transparent, while the second Pressure generated layer 52-2 forms a first surface area of the particle 50 having a first physical property.
  • the coating 54 forms a second surface area having a second, different physical property.
  • the transparent layer 42-2 or 52-1 may have additional material properties which are outside the visible spectral range, such as UV-stimulable luminescence or IR absorption.
  • the transparent layer may also have a polarizing property that can be verified with an aid such as a polarizing filter.
  • FIG. 5 (a) 1 shows a platelet-shaped printing / coating particle 60 having a transparent, print-produced carrier component 62, which defines the size and basic shape of the particle 60, and which is provided with two coatings 64-1, 64-2 with different optical properties.
  • the transparent carrier component 62 does not cover the optical properties of the first coating 64-1, but these are covered by the second coating 64-2. From viewing direction 66, therefore, the optical properties of the first coating 64-1 are predominantly recognizable, while from the opposite viewing direction 68, the optical properties of the second coating 64-2 predominantly appear.
  • the platelet-shaped pressure / coating particle 70 of Fig. 5 (b) has a similar structure as the particle 60 of Fig. 5 (a) However, between the coatings 64-1, 64-2, an intermediate layer 72 is provided which serves to improve the adhesion of the second coating 64-2 or the orientation of the second coating 64-2 on the first coating 64-1.
  • the platelet-shaped pressure / coating particle 80 has the Fig. 5 (c) a similar structure as the particle 70 of Fig. 5 (b) on.
  • the intermediate layer 82 in this case represents a layer with a visually less attractive appearance, which is obscured by the second coating 64-2.
  • the intermediate layer 82 may be, for example, a magnetic or magnetizable layer, a good heat-conducting layer or an electrically conductive layer.
  • the intermediate layer 82 may also consist of several single or alternating layers.
  • the coatings 64-1, 64-2 are applied on opposite sides of a support member 62, as in FIG Fig. 5 (d) shown.
  • the carrier component 62 may also be semi-transparent or even opaque in this case in order to avoid a mutual visual influence on the coatings 64-1, 64-2.
  • the coatings 64-1, 64-2 may in particular be optically variable coatings, such as thin-film elements, interference layers or liquid crystal layers.
  • the coating 64-1 may be a color-shifting liquid crystal layer and the coating 64-2 may be a non-color-changeable coating.
  • liquid-crystal layers can also have light-polarizing properties have, in addition to the different colors, a second, different physical property of the coatings can represent.
  • FIG. 6 shows in (a) to (d) examples of the appearance of inventive printing / coating particles 90 in plan view.
  • a shape of the particles 90 is in particular a platelet shape, hemispherical shape, spherical shape, rod shape, the shape of a dumbbell, a fungus, a tetrahedron in question.
  • the relative proportions of the at least two different printing / coating materials of the particles according to the invention can be the same, approximately the same (volume or mass fractions within 10%) or unequal in relation to the volume or the mass of the particles.
  • a printing-technologically produced layer can be pretreated, for example by means of flame pretreatment, a corona pretreatment or a plasma pretreatment, also with process gas feed.
  • a printing technique produced layer can also be equipped with a primer layer or adhesive layer by spray coating.
  • Another possibility is to apply an adhesive layer, for example an oxidic coating, by means of PVD methods.
  • FIG. 7 shows as another embodiment an anisotropic pressure / coating particle capsule 100, in which a hemispherical particle core 102, for example, in connection with Fig. 2 described manner is encapsulated in a liquid-filled microcapsule shell 104.
  • a release agent 106 may be provided, for example, an oil that the mobility of the particle core 102 within the microcapsule shell 104 even after printing and drying a Guaranteed pressure-coating particle capsules 100 containing printing ink.
  • Such pressure / coating particle capsules 100 are used in particular when the visible or measurable physical properties of the particles should still be able to be changed permanently by external stimuli even after the particles have been applied.
  • a magnetic particle core 102 can be aligned differently during the authenticity check by an external magnet and thereby show the observer, depending on the orientation, one of the two different surface regions 102A, 102B.
  • the particles to be encapsulated do not have a platelet structure but a pronounced 3D structure (symmetrical or asymmetrical) in order to avoid "glass plate effects" in a capsule.
  • 3D structure symmetrical or asymmetrical
  • the encapsulation of individual particles in one capsule is usually desired. The more pronounced the 3D structure is, the more likely it is to have only one particle per capsule.
  • the generated printing / coating particles are provided with an additional coating in a subsequent process.
  • additional coating a distinction is made between an additional coating that does not change the shape of the particles and a shape-changing additional coating.
  • an additional coating which does not change the shape for example, the chemical resistance or the surface tension of the printing / coating particles is influenced.
  • the additional coating can be done, for example, in a gas phase or a spray coating.
  • a shape changing additional coating For example, it is important to optimize the mechanical and / or chemical resistance of the particles.
  • a shape-changing additional coating can contribute to optimizing the rotatability of the particle cores in a capsule or to reduce accumulation of particle cores during encapsulation. Suitable methods for such an additional coating are, for example, the method of Brace GmbH or an eddy current coating method.
  • the particles can be made more mechanically stable or chemically stable by the additional coating or / and the outer shape of the particles can be changed with a preferably transparent layer, for example to turn a rod-shaped particle into a spherical particle.
  • FIGS. 4 to 7 For illustration, printing / coating particles or particle cores having only two different surface regions are shown, but it will be understood that the invention also encompasses designs with three or more different surface regions.
  • anisotropic printing / coating particles of the present invention can be prepared by various combinations of printing and coating methods, with exemplary manufacturing methods now being described with reference to FIGS FIGS. 8 to 12 be explained in more detail.
  • a printing layer 112 is first produced on a carrier substrate 110 in partial regions, the shape and size of which define the two-dimensional and three-dimensional basic shape of the printing / coating particle.
  • a printing process For example, ink jet processes (DOD), laser printing, transfer printing processes, in particular thermal transfer printing processes based on fusible base materials, flexographic printing, screen printing or gravure printing can be used.
  • the printing-technologically produced layer 112 does not necessarily have to have one of the desired different physical properties of the finished particle, but instead can for example simply represent a transparent layer and / or form a carrier constituent of the finished particle.
  • the printing-produced layer 112 can be dried or cured before the subsequent process (for example in the case of a UV-curing binder) or it can be further processed without drying / curing.
  • At least one further layer 114 is unapassed by means of a coating method, such as spray coating, sputtering or PVD, and a multiplicity of the printing-technologically produced layer regions 112 are applied in a spanning manner.
  • a coating method such as spray coating, sputtering or PVD
  • at least one further desired physical property of the finished particle is generated.
  • the entire particle is dried or cured.
  • the layers 114 produced by means of coating processes are mechanically significantly more unstable than the printing-produced layers 112, inter alia because of the brittleness of the material and the layer thickness, separation of the particles from the carrier substrate 110 and / or a subsequent processing step results in separation not on one produced by printing technology layer 112, or located outside of the layers 112 areas 116 of the coating 114.
  • the predetermined breaking points In this case, the outer edges of the printing-technologically produced layers 112 are preferred.
  • FIG. 9 (a) shows for illustration a detached from the carrier substrate 110 raw particle 120, which comprises the pressure-technically generated layer 112, located on the layer 112 areas 118 of the coating 114, as well as on the left side of the raw particle 120 still existing coating projection 122 includes.
  • This supernatant is removed in a further processing step, so that the in Fig. 9 (b) shown finished Janus particles 124 is formed. It is understood that in this way it is also possible to build up particles with more than one print-produced layer and with more than one layer produced by a coating method on the carrier substrate 110.
  • the separation of the raw particles 120 from the carrier substrate 110 can take place in different ways, as already explained in more detail above.
  • a coating 114 is applied over a large area to a carrier substrate 110 using a coating method such as spray coating, sputtering or PVD. Then, in each case, a printing layer 112 is produced on the coating by means of a printing process in partial regions.
  • a printing process here too, for example, ink-jet processes (DOD), laser printing, transfer printing processes, in particular thermal transfer printing processes based on meltable base materials, flexographic printing, screen printing or gravure printing can be used.
  • FIG. 11 1 schematically shows a particle 126 detached from the carrier substrate 110, which comprises a print-produced layer 112 and areas 118 of the coating 114 located on or below the layer 112.
  • the shape and size of the printing layer 112 also defines the two-dimensional and three-dimensional basic shape of the printing / coating particle 126 by virtue of the registration-specific breaking off of the coating 114.
  • particles of more than one type produced by printing are also produced in this variant Layer can be constructed on the carrier substrate 110 with more than one layer produced by a coating process.
  • layer regions 112 are first printed onto a circulating endless belt 110.
  • the layer regions 112 are printed on the endless belt 110 with a continuous ink jet, an ink jet or a 3D printer. Then, a plurality of layer portions 112 together with the intermediate portions of the endless belt 110 are unpopulated with a coating 114.
  • the endless belt 110 runs at a stripping station by a mechanical stripping device 130.
  • the stripping takes place in the exemplary embodiment by a sharp-edged deflection of the endless belt 110 on a fixed rounded plate 132.
  • the detached raw particles 120 are collected in a collecting device 134 and, if necessary, by sorting in good and bad particles, processed to the finished printing / coating particles 124.
  • the coating supernatant 122 of the particles 120 has not yet been sufficiently removed from the carrier substrate 110 during the detachment process, then the supernatants 122 can be subsequently broken, for example, in a pigment mixer, for example a drum mixer. Alternatively, it is also possible, for example, to work with an air jet mill.
  • the free, that is not associated with a pressure-technically generated layer coating material can be removed for example by means of a water bath, in which the tinsel of the coating material float and can be skimmed off. Optionally, it can be helped with a Wassersprudler. In this case, the generated air bubbles help to accelerate the buoyancy of the baubles.
  • a separator may also be used to separate the coating layer not connected to a printing-technologically produced layer in order to produce the required product quality.
  • the proportion of the printing / coating particles 14,16 in the printing ink 10 is expediently at least 0.1%, advantageously more than 3%.
  • the maximum particle size (D90) is based on the printing and coating methods used. In offset printing, the maximum particle size is advantageously less than 5 ⁇ m, while in screen printing a maximum particle size of less than 50 ⁇ m is advantageous.
  • the printing / coating particles used in the ink 10 may be the same or, as in the embodiment of Fig. 1 may also be dissimilar and contain two or more different types of printing / coating particles.
  • the printing / coating particles can also be admixed in another application example as a visually visible security feature of an ink.
  • physically orientable printing / coating particles are used and the color is cured only after orientation or after orientation of a part of the particles.
  • the orientation of the particles can be effected by means of a magnetic field, an electric field, a location-dependent repulsion effect, for example due to a location-dependent surface tension, by gravimetric forces, by capillary forces in the printed substrate or by a combination of said forces.
  • the particles can also be aligned only in a partial region of the applied color, for example by a masked drying or only in some areas magnetic orientation.
  • the detection of the printing / coating particles can be done with aids, such as a UV lamp, or visible colors without aids.
  • aids such as a UV lamp, or visible colors without aids.
  • the Janus particles or printing / coating particles can also be formed in the form of a capsule 100, as in FIG Fig. 7 shown.
  • the shape of the capsule 100 is arbitrary.
  • the capsule 100 contains a carrier medium 106 for the particle cores 102, which may be liquid or gaseous.
  • the carrier medium 106 may be solid, liquid or gaseous, depending on the temperature or orientation state induced by light or pH.
  • Fig. 7 shows only a single particle core 102 inside a capsule 100
  • a plurality of identical or dissimilar particle cores may be contained in a capsule 100.
  • the capsules 100 may be part of an ink, a coating, a paint or a plastic. Due to the encapsulation, the printing / coating particles can also be subsequently oriented in the applied and cured printing ink, coating material, paint or plastic, if the carrier medium has a liquid or gaseous state.
  • the alignment can be done by magnetic forces, electrical forces, gravimetric forces or by strong shaking movements. Detection with aids, such as a magnet, is also possible within a transparent capsule.

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EP18000778.3A 2017-12-19 2018-09-28 Particules de protection contre la contrefaçon Active EP3501839B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102017011770.5A DE102017011770A1 (de) 2017-12-19 2017-12-19 Partikel für den Fälschungsschutz

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EP3501839A1 true EP3501839A1 (fr) 2019-06-26
EP3501839B1 EP3501839B1 (fr) 2021-08-11

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114690296A (zh) * 2020-12-29 2022-07-01 恩希爱（杭州）薄膜有限公司 一种逆反射片及其制备方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019008642A1 (de) * 2019-12-13 2021-06-17 Giesecke+Devrient Currency Technology Gmbh Verfahren zur Herstellung von plättchenförmigen Effektpigmenten
DE102021000892A1 (de) 2021-02-19 2022-08-25 Giesecke+Devrient Currency Technology Gmbh Sicherheitselement mit bei IR-Beleuchtung transparenten Druckfarben und einem maschinenlesbaren Merkmal

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3012367A1 (fr) * 2013-10-31 2015-05-01 Arjowiggins Security Document securise et pigment.

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3012367A1 (fr) * 2013-10-31 2015-05-01 Arjowiggins Security Document securise et pigment.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114690296A (zh) * 2020-12-29 2022-07-01 恩希爱（杭州）薄膜有限公司 一种逆反射片及其制备方法
CN114690296B (zh) * 2020-12-29 2024-04-05 恩希爱（杭州）薄膜有限公司 一种逆反射片及其制备方法

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