EP3332982A1 - Élément de sécurité pourvu de marques luminescentes - Google Patents

Élément de sécurité pourvu de marques luminescentes Download PDF

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Publication number
EP3332982A1
EP3332982A1 EP17001967.3A EP17001967A EP3332982A1 EP 3332982 A1 EP3332982 A1 EP 3332982A1 EP 17001967 A EP17001967 A EP 17001967A EP 3332982 A1 EP3332982 A1 EP 3332982A1
Authority
EP
European Patent Office
Prior art keywords
pigments
luminescent
luminescence
security element
effect
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP17001967.3A
Other languages
German (de)
English (en)
Inventor
Peter Schiffmann
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 EP3332982A1 publication Critical patent/EP3332982A1/fr
Pending legal-status Critical Current

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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
    • B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
    • B42D25/23—Identity cards
    • 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
    • B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
    • B42D25/24—Passports
    • 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
    • B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
    • B42D25/29—Securities; Bank notes
    • 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
    • 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
    • B42D25/40—Manufacture
    • B42D25/405—Marking
    • B42D25/41—Marking using electromagnetic radiation
    • 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
    • B42D25/40—Manufacture
    • B42D25/405—Marking
    • B42D25/425—Marking by deformation, e.g. embossing

Definitions

  • the invention relates to a security element with a luminescent feature for securing security papers, documents of value and other data carriers.
  • the invention also relates to a method for producing such a security element as well as a data carrier equipped with such a security element.
  • Data carriers such as valuables or identity documents, but also other valuables, such as branded goods, are often provided with security elements for the purpose of security, which permit verification of the authenticity of the data carrier and at the same time serve as protection against unauthorized reproduction.
  • security elements for the purpose of security, which permit verification of the authenticity of the data carrier and at the same time serve as protection against unauthorized reproduction.
  • fluorescent inks it is known to print fluorescent inks on a security paper using various printing methods.
  • a fluorescent color is printed in the form of a motif, which is not visible in normal daylight, but when viewed under UV illumination is visible.
  • the fluorescent color can also be admixed with a visible color in daylight, so that the printed motif is visible even in daylight, with a similar or a different hue.
  • the present invention seeks to provide a security element of the type mentioned with high protection against counterfeiting.
  • the luminescence radiation emitted by the luminescence feature is preferably in the visible spectral range, but may in principle also be at least partially in the infrared spectral range.
  • the luminescence can be monochromatic, but especially multicolored.
  • the effect pigments already contain said luminescent material, for example in the form of a luminescent layer.
  • the luminescent material may also be present in a separate layer, for example a background layer.
  • the illumination direction selectivity of the security element is created by the orientation of the effect pigments in the form of the luminescence motifs.
  • the different relative orientation of the illumination direction and platelet plane of the effect pigments due to the different relative orientation of the illumination direction and platelet plane of the effect pigments, a differently strong excitation of the luminescence or a different degree of UV absorption result, so that different luminescence images can be generated depending on the direction of incidence of the excitation radiation.
  • the platelet-shaped effect pigments advantageously have an aspect ratio which is more than 5: 1, preferably more than 10: 1 and particularly preferably between 20: 1 and 400: 1.
  • the aspect ratio of the platelet-shaped effect pigments is the ratio of edge length to thickness of the platelets.
  • the effect pigments are magnetically alignable and contain a core with a magnetic material.
  • the core comprises a carrier substrate and a magnetic layer present on the carrier substrate.
  • the carrier substrate itself may already be magnetic.
  • the magnetic material advantageously comprises magnetite (Fe 3 O 4 ), carbonyl iron and / or a magnetizable polymer.
  • the magnetic material is provided on at least one of the main surfaces of the effect pigment, preferably at least on both main surfaces with a covering coating, in particular a white or colored opaque coating.
  • a covering coating in particular a white or colored opaque coating.
  • the opaque coating can, but does not have to additionally coat the narrow side edges of the effect pigment.
  • the effect pigments are non-magnetic and contain a platelet-shaped core.
  • the platelet-shaped core is provided on at least one of its main surfaces, preferably at least on both main surfaces, with a covering coating, in particular a white or colored covering coating.
  • the opaque coating can, but does not have to additionally coat the narrow side edges of the effect pigment.
  • the opaque coating may in particular consist of TiO 2 or a porous and thus scattering or covering polyester layer.
  • the covering coating can be absorbent in a partial region of the UV spectrum.
  • Covering coatings, eg. B. from TiO 2 can also also be impermeable to at least a portion of the visual (VIS) spectrum.
  • the effect layer is arranged at least partially over a background layer, wherein the visually visible color of the covering coating of the effect pigments essentially corresponds to the visually visible color of the background layer.
  • the platelet-shaped core of the non-magnetic effect pigments has no covering coating.
  • the luminescence motifs are not visible without illumination with UV excitation radiation. This can be achieved in particular by coordinating the visually visible color of the covering coating on the visually visible color of a background layer or a substrate on which the security element is applied. In the case of normal daylighting or artificial lighting, it is then not readily apparent that a luminescence feature is present at this point in particular.
  • the effect pigments are luminescent pigments or combination pigments which themselves form the luminescent material mentioned.
  • the effect pigments are luminescent pigments or combination pigments
  • the effect layer is at least partially disposed over a background layer with said luminescent material.
  • the luminescence differs Luminescence pigments or combination pigments of the luminescence of the background layer in the excitation wavelength, the emission wavelength, and / or the decay time.
  • the invention provides that the effect pigments are luminescent pigments or combination pigments in which a luminescent agent is arranged on the opaque coating or admixed with the opaque coating.
  • the opaque coating preferably has the lowest possible UV absorption in the region of the preferred excitation wavelength of the luminescence agent.
  • the effect pigments are luminescent pigments or combination pigments which contain at least two different luminescent agents which differ in terms of the excitation wavelength, the emission wavelength, and / or the decay time.
  • the effect pigments are non-luminescent UV-absorbing pigments and the effect layer is at least partially disposed over a background layer with said luminescent material.
  • a further layer with a third luminescent agent is arranged at least partially over the effect layer, wherein advantageously the luminescence of the third luminescence means of the luminescence of the luminescent pigments or combination pigments and / or the luminescence of the background layer by the excitation wavelength, the emission wavelength , and / or the cooldown is different.
  • the effect layer may be admixed with a fourth luminescent agent which supplements the luminescence of the luminescent pigments or combination pigments and / or the luminescence of the background layer, resulting in additive color mixing of luminescent colors.
  • a fourth luminescent agent which supplements the luminescence of the luminescent pigments or combination pigments and / or the luminescence of the background layer, resulting in additive color mixing of luminescent colors.
  • the orientation of the platelet-shaped effect pigments has no or only a negligible influence on the luminescence of such an additional luminescence agent.
  • the effect pigments are luminescent pigments, they have in particular a structure with a carrier substrate, an optional magnetic layer, an optional opaque coating and a luminescent coating.
  • the effect pigments are non-luminescent UV-absorbing pigments, they have, in particular, a structure with a carrier substrate, an optional magnetic layer, an optional opaque coating and a coating with a UV absorber transparent in the visual spectral range.
  • the effect pigments are combination pigments, they have, in particular, a structure with a carrier substrate, an optional magnetic layer, an opaque coating, a luminescence coating and a coating with a UV absorber transparent in the visual spectral range.
  • the first wavelength range in which the combination pigments are excitable for luminescence advantageously comprises the second UV wavelength range in which the combination pigments are UV-absorbing.
  • the first wavelength range can cover the entire UV spectral range of 200 nm to 400 nm, while the second wavelength range is only in the long-wave UVA range or only in the short-wave UVC range.
  • the effect pigments can be provided with a final, transparent coating.
  • the effect pigments may additionally contain a visually unrecognizable IR absorber, whereby on the one hand a further authenticity feature is added to the security element, and on the other hand the effect pigments can be marked or ablated by means of IR lasers.
  • the security element advantageously contains a substrate on which said luminescent material and the effect layer are applied.
  • This security element substrate can also be formed by the substrate of a data carrier, for example a value document.
  • the security element substrate may be a self-non-luminescent substrate, but may advantageously also be a luminescent substrate, wherein advantageously the luminescence of the substrate and at least one luminescence of the luminescence feature differ by the excitation wavelength, the emission wavelength, and / or the decay time.
  • the security element substrate can be a film, in particular a thread, strip, patch, or a film substrate of a polymer banknote based on BOPP or PET, but it can also be a paper-based substrate based on cellulose pulp, a hybrid substrate with a paper core and film lamination , or a polymer core and an outer paper layer. Also a coated substrate, in particular a painted or precoated Substrate is an option, as well as a plastic and / or paper or cardboard-based card body.
  • the invention also includes a data carrier with a security element of the type described.
  • the security element may in particular be arranged in a window region of the data carrier, for example via an opening or a transparent or translucent subregion of the data carrier.
  • the described illumination direction selectivity of the security element can be observed on both sides of the data carrier, as long as the security element does not have a substrate which absorbs the UV excitation radiation or the window region is UV-absorbing.
  • Luminescent pigments may in particular be based on a mica or a synthetic mica which is coated with a magnetite. Subsequently, the magnetite-coated mica is coated in a sol-gel process with titanium dioxide and finally in an immersion bath with an inorganic or organic luminescent.
  • Inorganic luminescent substances or pigments are dispersed, for example, in a solvent-based binder matrix. Subsequently, the carrier substrates, such as. As the magnetite-coated mica, mixed. During mixing, the solvent is finally removed under vacuum. According to a production variant, the coated carrier substrates are sprayed and dried under vacuum.
  • the carrier substrates can also be provided with an acceptance layer, which consists for example of sheet silicates.
  • the carrier substrates coated in this way are then mixed in the next step with a luminescence dye dissolved in a suitable solvent. The solvent is then stripped off under vacuum.
  • the particle size of the pigments in these cases essentially corresponds to the particle size of the inorganic carrier.
  • this particle size can be reduced by a milling process, for example with the aid of an air jet mill.
  • layer sequences which correspond to the layer structure of the desired pigments can be applied symmetrically to a film support. Subsequently, the coating is separated from the film by these is removed, for example, over a steep angle. By the Brittleness of the applied layer sequences form pigment flakes whose size can be reduced by a subsequent grinding step, for example by means of an air jet mill, as desired.
  • the film carrier is particularly preferably provided in advance by means of stamping processes or by printing with a grid structure in order to taper the coating in the region of the grid and thereby create predetermined breaking points.
  • the application of the layers can be effected by means of printing processes or a classical coating system, for example roll coater, blade coater, slot nozzle application or even curtain method.
  • a classical coating system for example roll coater, blade coater, slot nozzle application or even curtain method.
  • at least the magnetizable coating is applied by means of a PVD process.
  • the abovementioned magnetic layer is simply omitted in the production of the pigments.
  • the effect pigments are admixed to a binder, in particular a UV-drying binder, in order to formulate a printing ink, in particular a flexographic or screen printing ink.
  • a printing ink in particular a flexographic or screen printing ink.
  • This ink is then printed in the desired form on a substrate or undercoat to form the effect layer.
  • the platelet-shaped effect pigments are typically oriented with their main surface substantially parallel to the substrate surface.
  • the binder In order to produce a region-wise deviating orientation of the effect pigments, the binder is still wet in an external state Applied magnetic field, which aligns the magnetic effect pigments in the form of the desired luminescence motifs. In this state, the binder of the printing ink is then dried, for example by UV exposure, in order to permanently fix the alignment of the effect pigments.
  • the binder is cured or cured as quickly as possible after the orientation of the effect pigments.
  • a hardening can be done for example with a UV LED dryer. This has the advantage that it can be used in the immediate vicinity of the alignment module due to its compact design.
  • the substrate is provided with a background layer, in particular with a paint, a lacquer or a transfer element, before the effect layer is applied.
  • a background layer in particular with a paint, a lacquer or a transfer element, before the effect layer is applied.
  • a mechanical alignment can take place with the aid of a raised printing form, for example a high-pressure or flexographic printing plate, the elevations of the printing form being shaped in the form of the desired luminescence motifs.
  • the impressions of the elevations of the printing form in the not yet hardened effect layer displaces the immediately adjacent to the elevations effect pigments and brings them in an upright, or even substantially vertical orientation.
  • the binder of the printing ink is cured before the rear-orientation of the effect pigments, thereby permanently fixing the orientation of the effect pigments.
  • the examination of the luminescence feature can be done, for example, with a UV hand lamp, in particular a focused UV hand lamp at a point of sale. Depending on the position of the hand lamp, visually different luminescence motifs appear.
  • the test can also be done mechanically by means of a sensor.
  • the luminescence feature can be alternately excited with a UV light source from at least two directions and the generated luminescence image can be recorded synchronized by means of a CCD chip or a line scan camera so that two different image files are formed.
  • an image can be taken in two different stations with different relative arrangement of UV light source and camera.
  • the described luminescence feature can be combined with other security elements, preferably with security elements, which likewise have an optical effect which corresponds particularly advantageously to the visual impression of the luminescence feature.
  • FIG. 1 shows a schematic representation of a banknote 10 with a security element 14 according to the invention in the form of a illumination direction-selective luminescence feature 16. While the luminescence feature 16 is not visible in normal daylight or artificial lighting, it shows when excited by UV radiation, such as the UV lamp of a point of sale , a colored luminescent motif indicated by dashed lines. As a special feature, different colored luminescence motifs become visible upon excitation from different directions of illumination.
  • the luminescent feature 16 for example, in oblique illumination with a UV lamp in the Fig. 2 (a) illustrated first luminescent motif 20 having a yellow luminescent ellipse 22 in front of a green luminescent background 24.
  • the luminescence motif changes and the luminescence feature 16 now shows the in Fig. 2 (b) illustrated second luminescence motif 30, in which only the two side pieces 26 of the ellipse 22 luminesce yellow, while the central area 28 as well as the background 24 green luminesce.
  • the luminescence feature 16 appears uniformly white and thus does not stand out from the likewise white banknote paper 12 of the banknote.
  • neither the first nor the second luminescence motif 20, 30 is visible without UV illumination, since there is no color or brightness contrast between the side pieces 26 of the ellipse, the central region 28 of the ellipse and the background 24.
  • the invisibility of the luminescent feature under normal illumination is in Fig. 1 indicated by the dashed lines of the ellipse 22. Since the luminescence feature 16 with its white appearance is matched to the likewise white banknote paper 12, it is not readily apparent without UV illumination that a security element 14 is present at this location of the banknote 10.
  • FIG Fig. 3 is a cross section through the banknote 10 of Fig. 1 along the line III-III shows.
  • a background layer 40 is printed with a green luminescent phosphor.
  • the undercoat layer 40 forms the background 24 of the first and second luminescent motifs 20, 30.
  • an effect layer 42 which contains in a binder 44 a multiplicity of differently oriented platelet-shaped luminescent pigments 50.
  • the structure of the luminescent pigments 50 is shown in FIG Fig. 4 shown in more detail.
  • the luminescent pigments 50 contain as the core a carrier substrate 52 made of mica.
  • the carrier substrate 52 is in the embodiment of Fig. 4 completely enclosed with a magnetic layer, specifically a magnetite layer 54, which allows a magnetic alignment of the luminescent pigments in an external magnetic field.
  • the magnetite layer 54 is also completely surrounded by a covering white coating 56 of titanium dioxide, which ensures the white appearance of the luminescent pigments 50 under normal illumination.
  • the desired luminescent properties are imparted to the pigments 50 by a luminescent coating 58 surrounding the white coating, which in the exemplary embodiment contains a red-luminescent luminescent agent.
  • the luminescent pigments 50 are platelet-shaped with a high aspect ratio, ie a high edge-to-thickness ratio.
  • the luminescent pigments 50 were mixed with a UV-drying binder 44 to formulate a flexographic or screen printing ink. This printing ink was then printed on the background layer 40 in the form of the ellipse 22. Immediately after printing, the platelet-shaped luminescent pigments 50 with their main surface are usually substantially parallel to the substrate surface oriented. In order to produce a region-wise deviating orientation of the luminescent pigments 50, an external magnetic field was applied in the still uncured state of the binder 44, which aligns the magnetic luminescent pigments 50 in the central region 28 of the ellipse substantially perpendicular to the substrate surface. In this state, the binder 44 of the printing ink was dried by UV exposure and the generated alignment of the luminescent pigments 50 (FIG. Fig. 3 ) thereby permanently fixed.
  • the different orientation of the luminescent pigments 50 leads to significantly different luminescence images 20, 30 (FIG. Fig. 2 (a), (b) ).
  • the luminescent pigments 50 are all excited to be substantially equally strong for luminescence and the luminescent feature 16 thus shows in the region of the ellipse 22 a uniform yellow luminescence resulting from the additive color mixing of the green luminescence of the background layer 40 and the red luminescence of the luminescent pigments 50.
  • the red luminescent luminescent agent is excited, while in the partial regions or interstices in which the luminescent pigments do not overlap, substantially the green luminescent background layer 40 is excited.
  • a substantially vertical UV illumination offer the vertically oriented luminescent pigments 50 of the central portion 28 of the excitation radiation only a greatly reduced Impact surface and are therefore hardly stimulated.
  • the luminescence of the central region 28 is therefore dominated by the luminescence of the background layer 40 and thus appears substantially green.
  • the region of the background layer 40 that lies outside the effect layer 42 appears with green luminescence independently of the illumination direction 70A, 70B and provides a uniform background for the changing appearance of the ellipse 22.
  • the two luminescence images 20, 30 are easily recognizable and testable by a user, so that the luminescence feature 16 offers a high level of security against simple readjustment with fluorescent inks.
  • the coatings 54, 56, 58 are shown fully enclosed.
  • the coatings in the region of the side edges may also be present only partially or completely absent, for example when the pigments are ground in an air jet mill.
  • the pigments 50 may optionally have a further transparent coating 60.
  • the luminescent pigments may also be non-magnetic, as in Fig. 5 shown. In this embodiment is missing compared with the embodiment of Fig. 4 the magnetic layer 54.
  • the non-magnetic luminescent pigments 80 include a carrier substrate 52 made of mica, which with a covering white coating 56 from Titanium dioxide, a luminescent coating 58 and an optional further transparent coating is provided.
  • the covering coating 56 of the non-magnetic luminescent pigments 80 may also be absent, as in embodiments in which the carrier substrate is transparent or translucent and preferably colorless.
  • the non-magnetic luminescent pigments 80 may be mechanically aligned in the form of the desired luminescent motifs, as schematically shown in FIG Fig. 6 shown.
  • the luminescent pigments 80 are first admixed with a UV-drying binder in order to formulate a flexographic or screen printing ink. This ink is then printed onto the background layer 40 in the desired form to form the effect layer 42.
  • the platelet-shaped luminescent pigments 80 are oriented essentially parallel to the substrate surface.
  • a raised printing forme 82 for example a high-pressure or flexographic printing plate, is used, the elevations 84 of which are designed in a desired motif shape.
  • the luminescence pigments 80 lying directly next to the elevations 84 are mechanically displaced and thereby brought into an upright orientation.
  • the ink is cured with the luminescent pigments and the orientation of the pigments 80 thereby permanently fixed.
  • the magnetic or mechanical orientation of the luminescent pigments 50, 80 in the form of characters or Codings are done.
  • a suitable structured mask can be used for this purpose, which only transmits the magnetic field which aligns the pigments in certain areas.
  • a printing forme 82 with suitably shaped elevations 84 can be used, wherein in the case of larger surfaces to be aligned, a plurality of closely adjacent point or line elevations is advantageously used to ensure the desired alignment of the platelet-shaped pigments over a larger surface area.
  • FIG. 7 shows a modification of the embodiment of Fig. 2 in which the luminescent pigments 50, 80 are oriented vertically in a region 25 which is designed in the form of the lettering "Euro".
  • substantially all luminescent pigments 50, 80 are excited to luminescence independently of their orientation, so that the yellow luminescent ellipse 22 of FIG Fig. 2 (a) appears in front of a green luminescent background 24.
  • the luminescent pigments of region 25 are practically not excited due to their perpendicular orientation, so that this region, like the background, luminesces green.
  • the regions of different orientation of the luminescent pigments 50, 80 such as regions 26 and 28 of FIG Fig. 3 , usually not sharp-edged separated, but have a flowing, blurred or blurred transition.
  • the transition region between the regions of different orientation has, in particular, a width between 20 ⁇ m and 5000 ⁇ m.
  • the size of the transition region depends in particular on the method used to align the pigments (mechanically by embossing in the uncured state of the ink or by magnetic orientation of the pigments), substrate smoothness, substrate wetting, substrate absorbency and time delay between orientation and fixation of the pigments in the ink matrix or the binder.
  • the orientation of the luminescent pigments 50 can also be transferred virtually continuously from a horizontal to a vertical orientation, as in the luminescence feature 90 of FIG Fig. 8 (a) shown.
  • the luminescence feature 90 is up to the particular orientation of the Lumineszenzpigmente 50 as the luminescent feature 16 of Fig. 3 educated.
  • the continuous change in orientation shown can be generated, for example, with a cylindrical magnet which is arranged below the banknote paper 12 with its longitudinal axis parallel to the surface of the banknote paper.
  • the green luminescent strip 96 moves accordingly in the direction 97 along the ellipse 22 to the right, since the area 94 with the oriented parallel to the illumination direction of the pigments 50 in the illustration of the Fig. 8 (a) continuously shifts to the right.
  • the emission color of the luminescent agent of the background layer 40 may differ from the emission color of the luminescent pigments 50, 80.
  • a luminescent color predominantly corresponds to the luminescent color of the luminescent pigments 50 in regions 26, since these are excited much more strongly than the luminescent agent of background layer 40.
  • the region 28 predominantly shows the luminescence color of the background layer 40, since the luminescent pigments in this region are excited much less strongly by means of UV radiation.
  • the luminescent colors are self-luminous colors, the laws of additive color mixing are applicable to them, so that in particular a green, a blue and a red luminescent color add up to a luminescent white, if the proportions of the individual colors are matched to one another.
  • an equilibrium of the luminescent colors involved can also be set, so that in these areas, for example, a green and a red luminescence color adds to a yellow luminescent mixed color.
  • the region 26 shows, for example, a red luminescence, the region 28 a green luminescence and the intermediate transition region a yellow luminescence, so that the transition region acts as a differently colored corona for the region 26 or 28.
  • the background layer 40 may also be dispensed with, or the background layer formed non-luminescent. Also in these cases, the luminescence feature shows a different intensity distribution and / or color of the luminescence.
  • the regions 26 show a significantly higher luminescence intensity than the region 28, since in area 28 only the edge surfaces of the pigments are excited to illuminate and the luminescence is therefore opposite to that Areas 26 is strongly suppressed.
  • the effect layer of the luminescent feature always contains luminescent pigments 50, 80 which luminesce after excitation in one or more colors.
  • This luminescence can be determined by the luminescence of a background layer arranged under the effect layer be supplemented, so that results in certain lighting directions additive color mixing of luminescent.
  • the effect layer can also contain, as platelet-shaped effect pigments, non-luminescent UV-absorbing pigments which modify the luminescence of a background layer depending on the direction of illumination.
  • non-luminescent UV-absorbing pigments can otherwise be used and used like the luminescence pigments already described and, in particular, can also be magnetically or mechanically aligned.
  • FIG. 9 (a) shows a first embodiment of such a non-luminescent UV-absorbing pigment 100, which is magnetically aligned by a magnetic layer.
  • the pigment 100 contains as its core a carrier substrate 52 made of mica, which is provided with a magnetic layer, for example a magnetite layer 54, which allows magnetic alignment of the pigment 100 in an external magnetic field.
  • the magnetite layer 54 is, again completely enclosed, surrounded by a covering white coating 56 of titanium dioxide, which gives the pigment 100 a white appearance under normal illumination.
  • the desired UV-absorbing properties are provided to the pigment 100 by a coating 102 surrounding the TiO 2 coating with a UV absorber transparent in the visual spectral range, e.g. Tinuvin® 400 (BASF).
  • the opaque white coating 56 may also be absorbing in a (partial) region of the UV spectrum.
  • TiO 2 can be used, for example, in various modifications, in particular in the rutile or anatase modifications. Rutile absorbed in complete and anatase only in the short to medium wave UV wavelength range.
  • the coatings 54, 56, 102 may only be partially present or completely absent in the region of the side edges.
  • the pigments may also optionally have a further transparent coating 60 to improve the chemical and physical resistances and / or the wetting of the pigments with a binder.
  • the non-magnetic UV-absorbing pigments 104 of the Fig. 9 (b) include a support substrate 52 made of mica, a covering white coating 56 of titanium dioxide, a coating 102 having a transparent in the visual spectral range UV absorber and optionally a further transparent coating.
  • Fig. 10 (a) shows the luminescence feature in UV illumination from an oblique angle in the background region 24, the green luminescence of the substrate layer 40.
  • the UV-absorbing pigments 100 absorb the incident UV radiation and for the most part do not let the background layer 40 through.
  • the wording "for the most part" takes account of the fact that due to the desired ink layer thickness and pigment concentration in the area of the ellipse 22, complete absorption of the green luminescence of the background layer 40 by the UV-absorbing pigments 100 can generally not be achieved.
  • the pigments 100 oriented vertically in the region 25 allow the excitation radiation to pass through practically unimpaired, so that the luminescent agent of the background layer 40 is excited to emit light, and within the non-luminescent ellipse 22 a green luminescent lettering " Euro "shows how in Fig. 10 (b) shown.
  • pigments 130 which combine luminescent properties and UV-absorbing properties.
  • Fig. 11 contains such a combination pigment 130 as a core a carrier substrate 52 made of mica, which is provided with a magnetite layer 54, a covering white coating 56 of titanium dioxide, a luminescent coating 132 and a coating 134 with a transparent in the visual spectral range UV absorber.
  • the luminescent coating 132 can be excited in the entire wavelength range of the UV spectrum from 200 nm to 400 nm, while the UV absorber of the coating 134 absorbs only in a partial region of the UV spectrum, for example in the range from 200 nm to 280 nm.
  • a corresponding luminescence feature is illuminated, for example, with long-wave UVA radiation having a wavelength of 366 nm in which the coating 134 is not absorbed, the luminescence of the luminescent coating 132 of the combination pigments 130 is excited and the reference is made to FIG FIGS. 2 to 8 already described effects.
  • the luminescent feature is illuminated with short-wave UVC radiation having a wavelength of 254 nm, the coating 134 absorbs the incident UV radiation and the luminescent coating 132 is not excited.
  • the combination pigments 130 thus act at this excitation wavelength not as luminescent pigments, but as non-luminescent UV-absorbing pigments, so that now the at FIG. 10 described Effects result. Since different visual effects occur depending on the excitation wavelength, the counterfeiting security of security elements according to the invention is further increased by the use of such combination pigments.
  • the combination pigment 130 of the Fig. 11 has a magnetic layer 54 and is therefore magnetically alignable. It is understood, however, that the magnetic layer can also be missing in combination pigments and the non-magnetic combination pigments can be mechanically aligned, as above in connection with the Figures 5 and 9 (b) already described for luminescent pigments 80 or UV-absorbing pigments 104.

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EP17001967.3A 2016-12-09 2017-11-30 Élément de sécurité pourvu de marques luminescentes Pending EP3332982A1 (fr)

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DE102016014665.6A DE102016014665A1 (de) 2016-12-09 2016-12-09 Sicherheitselement mit Lumineszenzmerkmal

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113554935A (zh) * 2021-06-17 2021-10-26 南京邮电大学 一种光响应型激光防伪标签、制备方法及其应用

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018007096A1 (de) * 2018-09-07 2020-03-12 Giesecke+Devrient Currency Technology Gmbh Sicherheitselement

Citations (6)

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Publication number Priority date Publication date Assignee Title
DE102007058601A1 (de) * 2007-12-04 2009-06-10 Merck Patent Gmbh Sicherheitspigment
WO2009074284A2 (fr) * 2007-12-11 2009-06-18 Giesecke & Devrient Gmbh Élément de sécurité optiquement variable
US20120068450A1 (en) * 2009-02-27 2012-03-22 Fortress Optical Features Ltd. Security device
WO2012130370A1 (fr) * 2011-04-01 2012-10-04 Giesecke & Devrient Gmbh Élément de sécurité variable optiquement doté d'une couche de couleur variable optiquement
WO2014086495A1 (fr) * 2012-12-07 2014-06-12 Giesecke & Devrient Gmbh Élément de sécurité visuellement variable, doté d'une structure à couches colorées visuellement variable
EP3098086A1 (fr) * 2015-05-27 2016-11-30 Giesecke & Devrient GmbH Élement de securite piezochrome

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007058601A1 (de) * 2007-12-04 2009-06-10 Merck Patent Gmbh Sicherheitspigment
WO2009074284A2 (fr) * 2007-12-11 2009-06-18 Giesecke & Devrient Gmbh Élément de sécurité optiquement variable
US20120068450A1 (en) * 2009-02-27 2012-03-22 Fortress Optical Features Ltd. Security device
WO2012130370A1 (fr) * 2011-04-01 2012-10-04 Giesecke & Devrient Gmbh Élément de sécurité variable optiquement doté d'une couche de couleur variable optiquement
WO2014086495A1 (fr) * 2012-12-07 2014-06-12 Giesecke & Devrient Gmbh Élément de sécurité visuellement variable, doté d'une structure à couches colorées visuellement variable
EP3098086A1 (fr) * 2015-05-27 2016-11-30 Giesecke & Devrient GmbH Élement de securite piezochrome

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113554935A (zh) * 2021-06-17 2021-10-26 南京邮电大学 一种光响应型激光防伪标签、制备方法及其应用
CN113554935B (zh) * 2021-06-17 2023-08-22 南京邮电大学 一种光响应型激光防伪标签、制备方法及其应用

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