EP3196043A1 - Élément optique variable comprenant un pigment pouvant être orienté magnétiquement - Google Patents

Élément optique variable comprenant un pigment pouvant être orienté magnétiquement Download PDF

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Publication number
EP3196043A1
EP3196043A1 EP17000095.4A EP17000095A EP3196043A1 EP 3196043 A1 EP3196043 A1 EP 3196043A1 EP 17000095 A EP17000095 A EP 17000095A EP 3196043 A1 EP3196043 A1 EP 3196043A1
Authority
EP
European Patent Office
Prior art keywords
fluid
optically variable
emulsion
phase
variable element
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
EP17000095.4A
Other languages
German (de)
English (en)
Other versions
EP3196043B1 (fr
Inventor
Peter Schiffmann
Martin Imhof
Christoph Mengel
Giselher Dorff
Karlheinz Mayer
Christine Traub-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 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 GmbH filed Critical Giesecke and Devrient GmbH
Publication of EP3196043A1 publication Critical patent/EP3196043A1/fr
Application granted granted Critical
Publication of EP3196043B1 publication Critical patent/EP3196043B1/fr
Not-in-force 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
    • 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
    • B42D25/378—Special inks
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/04—Testing magnetic properties of the materials thereof, e.g. by detection of magnetic imprint
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/06—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using wave or particle radiation
    • G07D7/12—Visible light, infrared or ultraviolet radiation
    • G07D7/1205—Testing spectral properties

Definitions

  • the present invention relates to an optically variable element for arrangement on a data carrier, in particular value object such as value document, a data carrier with an optically variable security element and a manufacturing method of an optically variable element.
  • Optically variable elements are used for design purposes, but also in one and / or as an authenticity feature.
  • Such authenticity feature also referred to as security feature, for example, a special optical reproduction depending on the viewing angle, such.
  • security feature for example, a special optical reproduction depending on the viewing angle, such.
  • hologram As a hologram.
  • changes in the optical reproduction or the visual impression due to changed physical or chemical conditions and environmental influences are conceivable, for example due to thermal influence.
  • a variable optical reproduction due to magnetic loading is known.
  • Previous optically variable elements which are known due to magnetic loading comprise a platelet-shaped optically variable magnetite-coated pigment encapsulated in a capsule with an enveloping liquid.
  • a cloudy or inconsistent color impression is visible as a function of the layers of the platelet-shaped pigments in the capsule.
  • these platelets align according to the magnetic field lines.
  • the slight change in position of the platelet-shaped magnetically orientable pigments inevitably leads to low optical contrasts.
  • the platelet-shaped coated pigment in the capsule can get stuck.
  • the object is achieved by an optically variable element for arrangement on a data carrier.
  • the optically variable element comprises a first phase having a first fluid which comprises a magnetically alignable pigment and has a first coloration.
  • the optically variable element comprises a second phase with a second fluid.
  • the second fluid has magnetically non-alignable properties with a second color.
  • the first and second phases have a different surface tension and are therefore immiscible with each other.
  • the first and second phases are surrounded by a capsule. In the further course of this capsule is also referred to as optically variable capsule.
  • the second fluid may comprise a magnetically non-alignable pigment or may be formed as a magnetically non-alignable pigment.
  • the second fluid is formed substantially non-magnetic.
  • the material of the second fluid, in particular of the magnetically non-alignable pigment be formed of non-magnetic material.
  • the material of the second fluid, in particular of the magnetically non-alignable pigment may be formed of magnetic material, but be such that it does not or hardly aligns in a magnetic field. This is the case, for example, if a magnetic coating and / or a core (part of the pigment) is very small in relation to the non-magnetic part of the second fluid.
  • the magnetically alignable pigment comprises a magnetizable material.
  • the magnetizable material has at least in the presence of a magnetic field to a magnetic moment and is magnetically formed in this state.
  • the magnetically orientable pigment is oriented along the magnetic field lines with respect to its north-south direction.
  • the magnetically orientable pigment preferably has paramagnetic, in particular superparamagnetic, properties. That is, the magnetically alignable pigment has no or a very small magnetic moment in the absence of a magnetic field, so that the magnetically alignable pigment is preferably not formed magnetically.
  • the alignment of an element in a magnetic field is understood to mean both an orientation and a positioning corresponding to the magnetic field.
  • the orientation is an arrangement in north-south direction along the magnetic field lines due to the magnetic moment.
  • Positioning is characterized by a location-related reference, for example a change of location and / or the taking of a location position.
  • the magnetic pigments are preferably stabilized in such a way that they neither aggregate nor sediment in their phase without being subjected to a magnetic field, in particular after removing and / or switching off a magnetic field source.
  • an optically variable element whereby in the magnetic field the first fluid is aligned with the magnetically orientable pigment.
  • the first fluid with the magnetizable pigment with the first color of a magnetic field source attracted and positioned according to the magnetic field source on the first side of the optically variable element .
  • the magnetically orientable pigment is oriented in the context of its magnetic moment corresponding to the magnetic field lines.
  • the second fluid with the magnetically non-alignable pigment is essentially displaced from the first fluid in the optically variable element, preferably the optically variable capsule, and positioned or positioned away from the magnetic field source at a second side.
  • the optically variable element preferably the optically variable capsule
  • the second color is visible.
  • the first fluid is aligned in accordance with the magnetic field source.
  • the first fluid displaces the second fluid with z. B. the magnetically pronounceausrichtbaren pigment.
  • the second fluid is then disposed substantially at the first side.
  • the positioning of the first and second fluids is preferably maintained.
  • the color impression of the first and second sides remains and the first and second colors are visible.
  • a data carrier in the sense of the invention is fundamentally to be understood as an object for the reproduction of information, in particular a value document.
  • value documents are understood leaf-shaped objects that represent, for example, a monetary value or an authorization and therefore should not be arbitrarily produced by unauthorized persons. They therefore have features which are not easy to produce, in particular to be copied, whose presence is an indication of the authenticity, i. the manufacture by an authorized agency.
  • Important examples of such value documents are chip cards, coupons, vouchers, checks and in particular banknotes.
  • the data carrier it is intended in particular to visually reproduce information which is of particular value and is preferably to be provided with an authenticity feature or security element.
  • the security element can be at least part of the information.
  • the first and / or second coloring can be formed by means of a pigmentation.
  • the pigmentation may include luminescent properties and, for example, emit light with wavelengths in the visible spectrum.
  • the pigmentation may have an emission of light in the infrared or ultraviolet spectrum.
  • the pigmentation can absorb light in the UV, Vis, and / or IR range.
  • the pigmentation can absorb light in the longer wavelength range and / or emit in the shorter wavelength range of the spectrum (anti-Stokes).
  • the optically variable capsule comprises a carrier fluid.
  • the carrier fluid is preferably a carrier liquid.
  • the Carrier fluid may include the first and second phases. Furthermore, the first phase or the second phase may form the carrier fluid.
  • first phase and / or the second phase may be formed as a dispersion, wherein the carrier fluid forms the dispersant of the first or second phase and the second or first phase forms the dispersed phase.
  • the first and / or second phases have a surface tension that is compatible with the surface tension of the dispersant, thereby allowing wetting of the first and / or second phases by the carrier fluid.
  • the first phase and second phase have different surface tension, so that the first and second phases are immiscible with one another and form different, separate phases.
  • the first phase is hydrophobic and the second phase is hydrophilic, or vice versa.
  • the wall of the optically variable capsule and / or a separating layer enveloping the first phase and / or the second phase are semitransparent. Due to the semi-transparency, a translucent coloration of the first or second phase is ensured, at the same time preventing blur effects and a color-covering reproduction possible. The degree of blurring should be adjusted so that too much contrast reduction is prevented by the blurring or scattering.
  • the wall of the optically variable capsule and / or the separating layer is formed transparent, whereby an unrestricted and non-transformed reproduction of the coloring is possible.
  • the first fluid in particular the magnetically alignable pigment, magnetite, in particular nanomagnetite, preferably comprises a plurality of aggregated non-ordered or oriented nanomagnetites, iron, and / or cobalt.
  • the first fluid may have a combination of nanomagnetite and iron, for example due to an oxidation of nanomagnetite from Fe 3 O 4 to Fe 2 O 3 .
  • the first phase or the first fluid is designed as ferrofluid.
  • the magnetically orientable pigment, in particular the first phase preferably has a very low to no remanence.
  • the magnetizable pigment, at least the first fluid comprises a dispersion having magnetic nanoparticles, typically from 2 to 50 nm, which are colloidally suspended in a dispersion medium.
  • the rheology in particular the viscosity of the carrier liquid or the first phase or second phase, is temperature-dependent. This means that at higher temperatures, the viscosity is lower.
  • the state of aggregation of the carrier liquid or the first phase or second phase changes from solid to liquid.
  • the switchability of the optically variable element is possible only at elevated temperature in the presence of an external magnet.
  • a combination of optically variable elements as figures, characters and / or surface parts with carrier liquids, which preferably have a different temperature-dependent viscosity is provided. These figures, characters and / or surface parts may be provided as printing based on colors comprising the optically variable capsule.
  • the first phase and the second phase are movably arranged within the optically variable capsule. It is possible that the first phase is oriented and positioned in the presence of a magnetic field source in its direction and / or in the direction of the magnetic field. In essence, the first phase is positioned towards the source of magnetic field, preferably magnet. Accordingly, the second phase is displaced from the first phase and disposed in a position substantially remote from the magnetic field source.
  • the side of the optically variable element which is close to the magnetic field source, corresponding to the magnetic field and a position of the magnetic field source substantially corresponding to the second color.
  • the coloring of the first phase for coloring the second phase has a large color difference. Due to a large color difference, a particularly clear color contrast can be seen.
  • an optically variable element consisting of optically variable capsules having a side and / or a point of a page, regardless of the viewing or illumination angle, a same or similar hue.
  • the page to be considered is defined as the side at which alignment of the first or second phase.
  • the first phase and / or second phase is essentially three-dimensional, preferably spherical, particularly preferably substantially spherical.
  • the first first color phase is positioned on the side of the capsule during and after the application of magnetic field, which is close to the capsule Magnetic field source is and the second phase with second coloration positioned on opposite side accordingly, regardless of the viewing angle on these two sides (0 ° -180 °) and / or the lighting, the first or second color opaque recognizable.
  • the first fluid or the first phase preferably has superparamagnetic properties. After applying the first phase with a magnetic field, in particular after removing or switching off the magnetic field, no remanence remains, so that a new alignment of the first phase in the optically variable capsule is possible without special demagnetization processes being carried out.
  • the optically variable element in particular the magnetically alignable pigment or the first phase, the magnetically non-alignable pigment or the second phase and / or the optically variable capsule, in particular a part thereof, for example the capsule wall, an effect pigment, in particular an IR, UV and / or a luminescent pigment.
  • an effect pigment in particular an IR, UV and / or a luminescent pigment.
  • the effect pigments can also be dyes. In particular, by such an effect pigment is a machine-readable evaluation and detection of the optically variable element extended and thus safer.
  • the magnetically alignable pigments or the first fluid and / or the magnetically non-alignable pigment or the second fluid may have the same, the same or different effect pigments, so that the authenticity of the optically variable element due to the match between the optically variable element and environment are checked can.
  • an effect dye can be used.
  • effect pigment and / or effect dye are understood to mean substances which have fluorescent and / or phosphorescent properties and / or which have anti-Stokes and / or IR-absorbing properties.
  • At least one first, more preferably both color states (first and second colors) and / or as far as available both effect states are arranged as a reference field in the vicinity of the optically variable element. A check of the optically variable element both without and with tools (also machine) is made very easy.
  • the first phase comprises a coloring area for reproducing the first color.
  • the coloring region may comprise a dye, preferably carbon black and / or organic colored pigments.
  • the colorant region can have a color filter, for example by means of coating and / or on the atomic level, for example by means of refraction on the atomic lattice.
  • the coloring area may surround, preferably envelop, the first phase, the first fluid and / or the magnetically alignable pigment.
  • the first and second phases may be arranged such that the second phase surrounds the first phase, preferably enveloped. Accordingly, the first phase is enclosed by the second phase, wherein preferably a separating layer, for example a dividing wall and / or a subcapsule wall, is formed.
  • a separating layer for example a dividing wall and / or a subcapsule wall
  • the first phase in particular the first fluid, encapsulated with a preferably soluble functional coating and / or functional particles may be formed.
  • the coating or the functional particles can at least temporarily form a partition wall, preferably an auxiliary capsule, around the magnetically alignable pigment, the coating or the functional particles, ie preferably the auxiliary capsule within the second fluid surrounding the auxiliary capsule, being dissolved or destroyed can. Even after the dissolution, the functional coating or the functional particles can remain at least partially formed.
  • the magnetically alignable pigments in particular magnetic particles of the magnetically alignable pigments, for example magnetic nanoparticles, may have a preferably coloring coating.
  • the optically variable capsule is preferably formed in size as a microcapsule, preferably with a mean diameter of 6-50 microns.
  • the optically variable capsule may be formed in relation to the size, in particular spatial extent to the magnetically alignable pigment or first phase, wherein preferably the first phase comprises pigments having an average diameter of less than 3 .mu.m, in particular less than 1 micron.
  • the optically variable capsule may comprise one or more first and / or second phases, which are formed differently from one another.
  • the optically variable element and optionally the optically variable security element can be arranged on a data carrier, in particular identity document and / or value document.
  • the optically variable element and optionally the optically variable security element on a Data carrier in particular identity document and / or document of value be arranged.
  • the optically variable element, in particular the security element In order for the optically variable element, in particular the security element, to have a specific reproduction already when it is delivered, in particular that identical or at least similar representations are used when a plurality of optically variable elements are used, the optically variable element, in particular security element in the production, or after the production, for example in a printing press, in a quality control in a test device of the optically variable element, for example in a Wertzaneprüfvoriques, in particular security elements, and / or in an input and / or output device of value documents, for example in an output terminal, pre-positioned and prepositioned.
  • a first fluid (first phase) is provided in one step.
  • the first fluid has a dispersion with magnetic particles, preferably ferrofluid.
  • the first fluid preferably the magnetically alignable particles, has a first coloration.
  • a second fluid (second phase) which is immiscible with the first fluid is provided.
  • the second fluid has a second color.
  • the second fluid has color pigments, wherein the second fluid is particularly preferably formed as a dispersion of color pigments.
  • the second fluid may have a dye for reproducing the second color.
  • the first fluid and the second fluid form a first emulsion in a further step.
  • first fluid forms the Dispersing agent and the second fluid, the disperse phase or the second fluid, the dispersant and the first fluid, the disperse phase.
  • which fluid forms the dispersant depends, for example, on the mixing point, the respective viscosity and / or the respective flow speed for forming the first emulsion.
  • a third fluid is mixed with the first emulsion, the third fluid being immiscible with the first emulsion, in particular with the dispersion medium of the first emulsion.
  • a second emulsion is formed with the first emulsion as the second emulsion dispersant and the third fluid as the disperse phase of the second emulsion, or the third fluid as the second emulsion dispersant and the first emulsion dispersant as the disperse phase of the second emulsion , Whether the third fluid or the first emulsion forms the dispersant or the disperse phase depends, for example, on the mixing point, the respective viscosity and / or the respective flow rate for forming the second emulsion.
  • a fourth fluid is provided, wherein the fourth fluid is immiscible with the second emulsion, in particular immiscible with the dispersion medium of the second emulsion.
  • the fourth fluid and the second emulsion form a third emulsion.
  • the fourth fluid forms the dispersant of the third emulsion and the dispersant of the second emulsion forms the disperse phase of the third emulsion.
  • the fourth fluid serves as the carrier fluid of the second emulsion.
  • a multi-shell emulsion is formed, wherein the magnetically orientable pigment or first phase or first fluid and / or the second phase or the second fluid is movably arranged are.
  • the magnetically orientable pigment and thus the first phase are aligned, whereby either the coloring of the first fluid or of the second fluid is visible according to the orientation and the direction of control on the optically variable element.
  • the dispersant of the second and / or the third emulsion is crosslinked.
  • an encapsulation of the first and / or second emulsion takes place.
  • the optically variable element can be transported easily and in a stable state and further processed, for example as a color pigment.
  • Crosslinking takes place, for example, by introduction of energy, in particular by means of heat or ultraviolet light. Furthermore, a chemical reaction would be conceivable.
  • the first, second, third and / or fourth fluid may comprise a dye, in particular a color pigment and / or an effect pigment or an effect dye.
  • a dispersion can be formed from the first fluid under high shear forces in an auxiliary fluid which has a surface tension incompatible with the first fluid.
  • the desired droplet size and thus a desired capsule size of the optically variable capsule are set as a function of the shear forces, the temperature, the viscosity and / or the shearing time.
  • the droplet size can be kept stable by electrostatic or steric stabilization to avoid Oswaldreifung.
  • An auxiliary capsule wall material for the auxiliary capsule is added to the dispersion.
  • the auxiliary capsule wall material has at least approximately compatible surface tension to the first fluid and the auxiliary fluid.
  • the auxiliary capsule wall material attaches between the interface of the first fluid and the auxiliary fluid.
  • the auxiliary capsule wall material is crosslinkable, for example by means of pH and / or temperature change of the auxiliary fluid formed.
  • the auxiliary fluid is further removed, for example, dried the dispersion with the auxiliary capsule, in particular freeze-dried.
  • the auxiliary capsule is dispersed in a second step in the second fluid (first mixture of substances).
  • the second fluid is preferably a colored pigment dispersion, which of course may also be another coloring fluid.
  • the dispersion of the second fluid and auxiliary capsule is emulsified into an (external) carrier liquid.
  • an (external) carrier liquid With the help of shear forces a desired droplet size can be achieved.
  • These droplets may combine one or a plurality of auxiliary capsules in combination with and from the second fluid.
  • the carrier liquid has a surface tension that is incompatible with the second fluid.
  • the emulsion or dispersion of carrier liquid (also carrier medium) and combination of auxiliary capsule and second fluid is supplied to a wall-forming material, wherein the wall-forming material wets the droplets of the emulsion or dispersion of the combination of auxiliary capsule and second fluid.
  • the wall-forming material wets the droplets of the emulsion or dispersion of the combination of auxiliary capsule and second fluid.
  • the auxiliary capsule is preferably at least partially, preferably completely, destroyed by means of (external) energy input, for example electron beams and / or light. Furthermore, a thermal (eg heating) and / or mechanical (eg ultrasound) energy input and / or a chemical reaction, for example a defined dissolution of the auxiliary capsule wall in the first substance mixture.
  • the auxiliary capsule wall may have a temporary stability, e.g. an auxiliary capsule wall of gelatin with an aqueous carrier fluid.
  • the auxiliary capsule exists only temporarily and is resolved after the creation of the (end) capsule.
  • the material of the auxiliary capsule wall is formed transparent.
  • the optically variable capsule according to the invention comprises a multiphase system, one phase containing the first phase and the first fluid having magnetic properties alignable pigment is formed.
  • This phase is particularly preferably designed as a magnetorheological fluid.
  • the first fluid comprises at least one magnetically alignable pigment, preferably ferrofluid, with a first coloration.
  • the first fluid forms the first phase of the optically variable element.
  • the second fluid is preferably a colored pigment dispersion having a second color.
  • the colored pigment dispersion forms the second phase of the optically variable element.
  • the colored pigment dispersion may also be present as a dye solution.
  • the data carrier may comprise the optically variable element according to the invention and / or optionally the optically variable security element.
  • the data carrier may comprise a verification element.
  • the verification element has a region of magnetic properties, that is, the region is magnetized and generates a magnetic field. For checking the optically variable element and / or optionally the optically variable security element, these can be brought into the vicinity of the magnetic region, preferably in overlap.
  • the magnetically orientable pigments align according to the magnetic field.
  • the data carrier has a plurality of optically variable elements or a plurality of optically variable security elements, which are preferably arranged in one or more layers in a matrix.
  • the data carrier is preferably a flat, sheet-shaped material.
  • the magnetic region may be formed structured, for example in the form of one or more characters, a figure and / or a Symbol. If the plurality of optically variable elements or the plurality of optically variable security elements is arranged in overlap with the structured magnetic area, the magnetically alignable pigments align in accordance with the magnetic field generated by the magnetic area.
  • the structure of the magnetic region can be recognized on the basis of the multiplicity of optically variable elements or the multiplicity of optically variable security elements.
  • the data carrier is preferably a value document, in particular a banknote.
  • the data carrier therefore has a self-certification element.
  • An authenticity element which is formed by the optically variable elements or the plurality of optically variable security elements, can be tested by the simultaneously provided on the disk verification element (magnetic area) of each user.
  • an embodiment of an optically variable element 10 is illustrated with reference to an optically variable capsule 105 according to the invention.
  • the optically variable element 10 has a second dispersion (in the present case pigment dispersion, second fluid) of magnetically non-alignable pigments 110 arranged in an inner carrier liquid 120.
  • the optically variable element 10 has a magnetically orientable first phase or a first fluid formed as a first dispersion.
  • the first fluid comprises a magnetic material, in the present case ferrofluid 100.
  • the ferrofluid 100 comprises colloidally suspended magnetic nanoparticles 104.
  • the first fluid (first phase) has a first color rendering, namely reddish brown, due to the ferrofluid 104.
  • the first fluid may include color particles for rendering a particular color (not shown).
  • the inner one Carrier liquid 120 with the magnetically non-alignable pigments 110 formed therein form a second phase or a second fluid.
  • the first dispersion and second dispersion have a different surface tension.
  • the first dispersion and second dispersion in the optically variable element 10 are immiscible with each other.
  • the optically variable element 10 is brought into a magnetic field, that is, in the vicinity of the optically variable element 10 is a magnetic field source, such as a magnet 20 (s. Fig. 1b ), the first phase is oriented with the magnetic material (ferrofluid 100) towards the magnet 20. That is, the ferrofluid 104 moves towards the magnet 20 and displaces the second phase or the second fluid, in particular the inner carrier liquid 120 with the magnetically non-alignable pigments 110.
  • the color reproduction is accordingly of the ferrofluid 100, on the side of the optically variable element 10 opposite to the magnet 20, the color rendering of the magnetically non-alignable pigments 110 can be recognized.
  • the Figure 1C shows a plurality of optically variable elements 10 of the Fig. 1a and 1b , disposed on a first side 2 of a substrate 30.
  • the optically variable elements 10 are arranged in a printing layer 31, for example an imprint of the substrate 30.
  • the Fig.1d shows optically variable elements 10 according to Fig. 1c when exposed to a magnet 20.
  • a magnet 20 is arranged on a second surface of the substrate 30 which faces the first surface.
  • the magnetic field of the magnet 20 affects the optically variable elements 10 in the region the printing layer 31, on which the magnet 20 is arranged. That is, these optically variable elements 10 are aligned according to the magnet 20, wherein, if not already done, the ferrofluid 100 moves in the optically variable elements 10 and thus the first phase to the second side 3 of the optically variable elements 10, which is associated with the magnet 20.
  • the first phase would then displace the second phase, in particular the magnetically non-alignable pigments 110 arranged in the inner carrier liquid 120, and be positioned on the side of the optically variable element 20 opposite the magnet 20.
  • first supervision is according to Fig.1d the color impression in the color of the color particles or the magnetically pronounceausrichtbaren pigments 110 to recognize.
  • arrow A When viewed in a transparent manner (arrow B), ie on the second side 3, the color rendering of the ferrofluid 100 appears in the case of partially transparent and / or transparent substrate 30, so that in the present case a red-brown to black color can be recognized.
  • the substrate 30 may be a transparent, translucent, opaque or substantially optically dense substrate based on paper, in particular fiber material, preferably cotton fibers, a film material or a composite of both, for example a hybrid substrate.
  • the printing layer 31 comprises a matrix in which the optically variable elements 10 are arranged.
  • the matrix is for example a binder of a paint, in particular printing ink, or a lacquer and / or a film, preferably plastic film and / or plastic fiber, in particular a fiber fleece based on the Kunststoffoffmaschine. If a magnet 20 is located on a second side 3 of the document of value 1, in the present case its underside, in the region of the imprint 31 with the optically variable element 10, the ferrofluid 100 of the optically variable element 10 aligns.
  • the ferrofluid 100 is positioned in the optically variable element 10 on the side of the magnet 20.
  • the magnetically non-alignable particles 110 of the second phase are displaced, in particular to positions on the side opposite the magnet 20.
  • a white color color of the magnetically non-alignable particles 110
  • a black color color of the first fluid or of the ferrofluid 100
  • a transparent substrate 30 is that reorientation of the first fluid or ferrofluid 100 and associated color rendering of the security element, i. the imprint 31, both on the first page 2 and on the second page 3 can be determined.
  • the imprint 31 can be checked for two different color renditions.
  • the transparent substrate is colored, so that a mixed color of the state of the optically variable element 10 and the color 31 shows and thus the color of the optically variable element is always different from the first page 2 to the second page 3.
  • an optically variable ink layer based on interference pigments.
  • dark first or second coloring for example, with ferrofluid 100 as the first fluid
  • ferrofluid 100 as the first fluid
  • the transparent substrate 30 additionally contains visually invisible UV-absorbing and / or IR-absorbing substances.
  • the magnetically non-alignable pigment 110 has a fluorescent coating. If the magnet 20 is located on the second side 3, a fluorescence can be detected upon irradiation with UV light when viewed in the direction of arrow A on the first side 2, which lies opposite the magnet 20. If, on the other hand, the magnet 20 is arranged on the first side 2, no fluorescence can be detected upon irradiation of the value document 1, in particular of the second side 3, with UV light from the second side 3. Thus, when exposed to UV light, the first side 2 and second side 3 have a different color impression.
  • a change of position of the magnetic field source, in this case of the magnet 20, is sensible for a visually dense substrate 30, so that, for one, the magnetically orientable pigments 100 and, for another, the magnetic ones non-orientable pigments 110 are visible on the first side 2. Only then would it be possible in particular to make an assessment on the imprint 31, in particular its color and its authenticity.
  • a magnet 20 'with structured surface or structured volume 201 may be used.
  • the structuring 201 encodes relief-like information with heights 202 and depressions 203.
  • a security element for example with the imprint 31 according to FIGS Figure 1C and 1d , A lower magnetic field, so that in this area, the ferrofluid 100 or the magnetically orientable pigments less strong, preferably not align.
  • the optically variable capsules 105 correspondingly represent the structuring 203 of the magnet 20 'and thus the coded information.
  • FIG. 2a to 2d is an example of an embodiment of a manufacturing method of the optically variable element 10 according to the Fig. 1a to 1d shown.
  • a first intersection point is supplied by a first container 81 with a first fluid, for example ferrofluid 100, in particular a first dispersion with magnetic particles 104.
  • a second fluid in particular a second dispersion, in the present case a coloring pigment dispersion 120 'with a large number of magnetically non-alignable particles, is supplied to the first intersection point 40.
  • the first dispersion and second dispersion have a different surface tension and are immiscible.
  • the first fluid is hydrophobic and the second fluid is hydrophilic.
  • a first emulsion 41 is formed from the first and second dispersion.
  • a feed geometry determines, for example, a nozzle for combining the first or second dispersion, their feed rates, viscosities and / or temperature, whether the first fluid or the first second fluid forms the dispersion medium or the disperse phase of the first emulsion 41.
  • the first emulsion 41 thus comprises a two-phase mixture of the first fluid and the second fluid.
  • the first emulsion 41 is supplied via a first connection, in the present case a first chip, to a second crossing point 50.
  • the first connection On the first emulsion 41 facing wall has a surface tension, which is compatible with the dispersion medium of the first emulsion 41. That is, the dispersion medium of the first emulsion 41 has hydrophilic properties, and the corresponding wall of the first compound also has hydrophilic properties, or vice versa.
  • the dispersion medium of the first emulsion 41 see Fig. 2b As the dispersion medium, the hydrophilic pigment dispersion 120 'having magnetically non-alignable particles and the disperse phase hydrophobic ferrofluid 100.
  • the dispersion medium in the first emulsion 41 forms.
  • the fluid with incompatible surface tension comes into contact with the wall and thus is not completely surrounded by the other fluid.
  • the first emulsion 41 is supplied with a third fluid 52, for example a polymer.
  • a second emulsion 51 is formed from the first emulsion 41 and the third fluid 52.
  • the third fluid 52 is in the present example a capsule wall material for forming a capsule wall, in particular the optically variable capsule according to the Fig. 1a-d ,
  • the third fluid 52 is presently a photopolymerizable fluid, for. As acrylate, and has hydrophobic properties.
  • a feed geometry such as a nozzle for combining the first emulsion 41 with the third fluid 52, their feed rates, viscosities and / or temperature at the second crossover point 50 determines whether the first emulsion 41 or the third fluid 52 is the dispersion medium or the disperse Phase of the second emulsion 51 forms.
  • the second emulsion 51 thus comprises the first emulsion 41 and from the first emulsion third fluid 52 is a multiphase mixture, wherein the first emulsion 41 forms a multi-shell emulsion.
  • the second emulsion 51 is supplied via a second connection (second chip) to a third intersection point 60.
  • the second compound has a surface tension on the wall facing the second emulsion 51 which is compatible with the dispersion medium of the second emulsion 51. That is, the dispersion medium of the second emulsion 51 has hydrophilic properties, and the corresponding wall of the second compound also has hydrophilic properties, or vice versa.
  • the dispersion medium of the second emulsion 51 (see Fig. 2c ) hydrophobic properties and the disperse phase of the second emulsion 51 have hydrophilic properties (due to hydrophilic dispersion medium of the first emulsion 41).
  • the corresponding wall of the second compound thus has hydrophobic properties.
  • phase (first emulsion 41 or third fluid 52) having a surface tension compatible with the second emulsion 51 forms the dispersion medium in the second emulsion 51.
  • the incompatible surface tension phase is prevented from contacting the wall and thus not being completely surrounded by the other phase (first emulsion 41 or third fluid 52).
  • the surface tension of the third fluid 52 may be selected such that either the first fluid or the second fluid is preferentially wetted by the third phase. Preferably, however, it wets and surrounds third phase, the dispersion medium of the first emulsion 41. In the present case, the third fluid 52 surrounds the first emulsion 41st
  • a fourth fluid 62 is fed to the second emulsion 51.
  • a third emulsion 61 is formed from the second emulsion 51 and the fourth fluid 62.
  • the fourth fluid 62 is an external carrier fluid in the present example.
  • the fourth fluid 62 has a surface tension which is not compatible with the dispersion medium of the second emulsion 51.
  • the fourth fluid is a hydrophilic outer carrier liquid, in the present case water.
  • a feed geometry such as a nozzle for combining the second emulsion 51 with the fourth fluid 62, their feed rates, viscosities and / or temperature at the third intersection point 60, whether the second emulsion 51 or the fourth fluid 62, determines the dispersion medium or the disperse Phase of the third emulsion 61 forms.
  • the third emulsion 61 thus comprises a multiphase mixture of the second emulsion 51 and the fourth fluid 62, the second emulsion 51 forming a multi-shell emulsion.
  • the third emulsion 61 is supplied to a discharge container 70 via a third connection (third chip).
  • the third compound has a surface tension on the wall facing the third emulsion 61 which is compatible with the dispersion medium of the third emulsion 61. That is, the dispersion medium of the third emulsion 61 has hydrophilic properties, and the corresponding wall of the third compound also has hydrophilic properties, or vice versa.
  • the associated wall of the third compound has correspondingly hydrophilic properties.
  • phase (second emulsion 51 or fourth fluid 62) having a compatible surface tension of the wall facing the third emulsion 61 forms the dispersion medium of the third emulsion 51.
  • the incompatible surface tension phase is prevented from contacting the wall and thus not completely surrounded by the other phase (second emulsion 51 or fourth fluid 62).
  • the surface tension of the fourth fluid 62 may be selected such that either the third fluid 52 or the second emulsion 51 is wetted by the fourth fluid 62.
  • the fourth fluid 62 wets and surrounds the dispersion medium of the second emulsion 51.
  • the third emulsion 61 is a multi-shell emulsion.
  • the multi-shell emulsion comprises particulate, preferably drop-shaped, the first emulsion 41, which is surrounded by the third fluid 52 and forms the second emulsion 51, which in turn is surrounded by the fourth fluid 62.
  • the third emulsion 61 After the third emulsion 61 is formed, it is exposed to UV light according to the exemplary embodiment, as a result of which the third fluid 52 crosslinks.
  • a capsule wall is formed which surrounds the second emulsion 51.
  • a source of energy for UV light is particularly suitable a focused LED UV emitter.
  • a focused LED UV emitter instead of or in addition to UV light, other methods of forming the capsule wall, e.g. B. thermal loading, conceivable.
  • An encapsulated particle of the third emulsion 61 constitutes an optically variable element 10.
  • the optically variable elements 10 formed in the third emulsion 61 are supplied to the output container 70 in the outer carrier liquid 62.
  • a first, second and / or third emulsion 41, 51, 61 having a uniform, reproducible size of the particles of the respective disperse phase is possible.
  • an auxiliary capsule wall is formed between the first and second fluid after or before mixing at the first crossing point 40.
  • the material of the auxiliary capsule wall has a surface tension that is compatible with the surface tension of the enveloping first or second fluid, such as coloring pigment dispersion 110 or ferrofluid 104.
  • the auxiliary capsule wall is destroyed, particularly preferably decomposed, for example by means of UV radiation, lasers and / or electron beams.
  • the auxiliary capsule wall can be designed to be soluble in the enveloping first or second dispersion, so that the auxiliary capsule wall dissolves, for example after a certain period of time and / or by means of the introduction of temperature.

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)
  • Credit Cards Or The Like (AREA)
  • Printing Methods (AREA)
  • Inks, Pencil-Leads, Or Crayons (AREA)
EP17000095.4A 2016-01-21 2017-01-20 Élément optique variable comprenant un pigment pouvant être orienté magnétiquement Not-in-force EP3196043B1 (fr)

Applications Claiming Priority (1)

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DE102016000590.4A DE102016000590A1 (de) 2016-01-21 2016-01-21 Optisch variables Element mit magnetisch ausrichtbaren Pigment

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017009507A1 (de) 2017-10-12 2019-04-18 Giesecke+Devrient Currency Technology Gmbh Verfahren zur Temperatur- oder Zeitüberwachung eines Gegenstandes
US20230185237A1 (en) * 2021-11-09 2023-06-15 Light Field Lab, Inc. Energy modulation systems for diffraction based holographic displays

Families Citing this family (2)

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Publication number Priority date Publication date Assignee Title
DE102018222669A1 (de) * 2018-12-20 2020-06-25 Bundesdruckerei Gmbh Verfahren zum Herstellen eines Wert- oder Sicherheitsdokuments oder eines Wert- oder Sicherheitsdokumentenrohlings und Wert- oder Sicherheitsdokument
DE102022002099A1 (de) 2022-06-10 2023-12-21 Giesecke+Devrient Currency Technology Gmbh Verfahren zur Herstellung optisch variabler Elemente sowie optisch variable Elemente zur Herstellung einer Druckfarbe und/oder eines Sicherheitsmerkmals

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Publication number Priority date Publication date Assignee Title
WO2009074284A2 (fr) * 2007-12-11 2009-06-18 Giesecke & Devrient Gmbh Élément de sécurité optiquement variable
DE102009023982A1 (de) * 2009-06-05 2010-12-09 Giesecke & Devrient Gmbh Sicherheitselement
EP2768677A1 (fr) * 2011-10-20 2014-08-27 Giesecke & Devrient GmbH Élément de sécurité optiquement variable comprenant une couche d'encre à base de microcapsules et son procédé de fabrication

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Publication number Priority date Publication date Assignee Title
DE102014019222A1 (de) * 2014-12-19 2016-07-07 Giesecke & Devrient Gmbh Herstellung eines Sicherheitsmerkmals

Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
WO2009074284A2 (fr) * 2007-12-11 2009-06-18 Giesecke & Devrient Gmbh Élément de sécurité optiquement variable
DE102009023982A1 (de) * 2009-06-05 2010-12-09 Giesecke & Devrient Gmbh Sicherheitselement
EP2768677A1 (fr) * 2011-10-20 2014-08-27 Giesecke & Devrient GmbH Élément de sécurité optiquement variable comprenant une couche d'encre à base de microcapsules et son procédé de fabrication

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017009507A1 (de) 2017-10-12 2019-04-18 Giesecke+Devrient Currency Technology Gmbh Verfahren zur Temperatur- oder Zeitüberwachung eines Gegenstandes
US20230185237A1 (en) * 2021-11-09 2023-06-15 Light Field Lab, Inc. Energy modulation systems for diffraction based holographic displays
US11927915B2 (en) * 2021-11-09 2024-03-12 Light Field Lab, Inc. Energy modulation systems for diffraction based holographic displays

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EP3196043B1 (fr) 2019-01-16

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