EP2144731B1 - Élément en feuille à couche de polymère - Google Patents

Élément en feuille à couche de polymère Download PDF

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Publication number
EP2144731B1
EP2144731B1 EP08749389A EP08749389A EP2144731B1 EP 2144731 B1 EP2144731 B1 EP 2144731B1 EP 08749389 A EP08749389 A EP 08749389A EP 08749389 A EP08749389 A EP 08749389A EP 2144731 B1 EP2144731 B1 EP 2144731B1
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EP
European Patent Office
Prior art keywords
layer
film element
polymer layer
regions
film
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.)
Active
Application number
EP08749389A
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German (de)
English (en)
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EP2144731A1 (fr
Inventor
Haymo Katschorek
Ludwig Brehm
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.)
Leonhard Kurz Stiftung and Co KG
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Leonhard Kurz Stiftung and Co KG
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Publication of EP2144731A1 publication Critical patent/EP2144731A1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/364—Liquid crystals
    • 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
    • B42D25/324—Reliefs
    • 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
    • B42D25/328—Diffraction gratings; Holograms
    • 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
    • B42D25/351—Translucent or partly translucent parts, e.g. windows
    • 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
    • B42D25/355—Security threads
    • B42D2033/26—

Definitions

  • the invention relates to a film element, in particular an embossing film, laminating film or sticker film or a part of such a film, which has a polymer layer of an at least partially oriented liquid crystal material.
  • EP 1 227 347 in that two orientation layers can be applied one above the other to a substrate.
  • the two layers are in each case irradiated with differently polarized light and then fixed, so that orientation layers with different orientation result, which are arranged one above the other.
  • orientation layers with different orientation result, which are arranged one above the other.
  • WO 2007/051 529 A1 a security element with the following layer sequence is known: a polarization-rotating layer, a circular-polarizing layer, a polarization-rotating layer. Subjects of the phase-shifting layers are not recognizable in transmitted light when viewing the security element, but only when the security element is viewed through a linear polarization filter in plan view.
  • WO 98/52 077 A1 discloses a liquid crystal-based security element in which the birefringence depends on the viewing angle. Thus, the expensive alternative of changing an angle of attack of the optical axis of a liquid crystal layer with respect to the plane of the security element can be circumvented.
  • JP 2000 255 200 A describes a security element in which a first and a third polymer layer have selectively reflective, but no circular polarizing properties.
  • a center delay plate serves to convert left circular light into right circular light, and vice versa.
  • the security element is only considered in reflection, not in transmitted light.
  • the first or the second security feature can be made visible to the human observer. If the top side of the film element is thus viewed through transmitted light through a polarizer arranged between the film element and the human observer, then the first security element, for example a figurative representation changing upon rotation of the polarizer, becomes visible. If the rear side of the film element is viewed through transmitted light through a polarizer arranged between the film element and the human observer, the second security element is selectively made visible.
  • the second security feature is selectively made visible and in the opposite case, ie when viewed from the back and with the light source at the front, selectively exposing the first security feature. Even when viewing the reflected light results in a corresponding, dependent on the viewing direction effect.
  • the film element according to the invention thus shows a surprising visual effect which is surprising for the viewer and makes it possible in a simple manner to make two different information items visible in one and the same area by means of a single, simple analyzer tool. For example, depending on the viewing side (front or back) selectively two different information is made visible.
  • the safety feature provided by the invention can only be very hard to imitate.
  • the film element thus offers a high degree of security combined with the already mentioned advantage that simple, cost-effective and widespread tools for the selective decoding of two different, hidden security features can be used.
  • the film element is designed as a transparent film element to the human observer when viewed in a transparent manner without a polarizer or without polarized light, i. All layers of the film element are transparent under these viewing conditions.
  • a color change or color change effect When viewed in plan view or diagonally in the viewing direction, it is possible, depending on the viewing angle, for a color change or color change effect to occur during tilting, which is caused by the cholesteric liquid crystal materials used.
  • the film element consists of three or more layers, which appear transparent in direct view, wherein the first, second and third polymer layers each form one of the transparent layers.
  • a transparent layer is hereby consider each layer that has an average transmittance greater than 50% in the range of the unpolarized light visible to the human observer.
  • one or more of the transparent layers can be colored or to have a color filter effect, thus giving the film element a colored, translucent impression when viewed through transmitted light without an analyzer tool or without polarized light.
  • the film element When viewed through transmitted light without a polarizer, the film element thus gives the human viewer, when viewed from both sides, the impression of a transparent area through which objects or even an imprint applied to a substrate can be viewed.
  • this transparent region surprisingly shows different optical information when viewed from different sides.
  • the film element may be configured such that a transparent carrier layer, in particular of polyester, is provided as the further transparent layer.
  • first and third regions of the first or third polymer layer overlap at least in regions, so that the first or the second security element becomes visible to the human observer in one and the same region depending on the viewing direction.
  • a cholesteric liquid crystal material is preferably used for the polymeric layers having circularly polarizing properties.
  • This liquid crystal material also has viewing angle-dependent color filter properties, so that a viewing angle-dependent color shift effect as a further optically recognizable security feature shows up in the region of the film element, especially in reflected light against a dark background.
  • the first and / or third regions in which the first or third layer has polarizing properties which form the security feature preferably form part regions of the first and third liquid crystal layers.
  • this liquid crystal layer has no polarizing Properties or polarization segregations that differ from the polarization properties of the first and third regions, respectively.
  • the first polymer layer is thus preferably not only provided in the region of the one or more first regions, but also provided in one or more remaining regions preferably enclosing the first regions, such that the region in which the first polymer layer is provided is composed of the one or more first areas and one or more remaining areas together.
  • the first polymer layer has no polarizing properties or polarization properties differing from the polarization properties of the first region, preferably circularly polarizing properties that differ from the first region.
  • the first polymer layer, the second polymer layer and the third polymer layer are provided over their entire area in a region of the film element.
  • the first polymer layer comprises one or more first zones in which the first polymer layer has circularly polarizing properties and one or more second zones in which the first polymer layer does not affect the polarization of the incident light or has polarizing properties different from those of the first polymer layer differentiate between first zones.
  • the first polymer layer preferably has no polarizing properties or circularly polarizing properties in the second zones, which differ from those of the first zones. For example, the handedness of the circular polarization differs in the first and second zones.
  • the first polymer layer still has one or more third zones or one or more fourth
  • Zones comprises, in which the first polymer layer has polarization properties which are different from those of the first and second zones or the first, second and third zones.
  • the one or more first areas forming a first security feature are preferably formed by the first zones. However, it is also possible for the one or more first areas forming the first security feature to be formed by two or more of the zones selected from the group consisting of first zone, second zone, third zone and fourth zone, each of which is circularly polarizing
  • the first security feature comprises an object to which first regions with varying polarization properties are assigned in order to generate a greyscale image.
  • the third polymer layer is preferably constructed as described above with respect to the first polymer layer.
  • the third polymer layer preferably also comprises first and second zones, wherein the first zones have circularly polarizing properties and the second zones have no polarizing properties or have polarizing properties which differ from the polarization properties of the first zones.
  • the third polymer layer may also have one or more further zones in which the polarization properties of the third polymer layer differ from those of the first and second zones, so that grayscale images can likewise be coded into the third polymer layer as a second security feature ,
  • the one or more areas forming the second security feature are formed by the first zones as mentioned above or first and second, first and third, first and fourth, first, second and third or first, second, third and fourth zones if these zones circularly polarizing
  • first polymer layer and / or the third polymer layer each comprise the first and second zones specified in greater detail above.
  • the second security feature comprises an object to which third regions with varying polarization properties are assigned in order to generate a greyscale image.
  • the different polarization properties of the first, second and third zones of the first and third polymer layer are preferably achieved by correspondingly different regional properties of a first or third orientation layer on which the liquid crystal material of the first and third polymer layer is applied and corresponding to the liquid crystal material of the first or third polymer layer is oriented.
  • the first and the second orientation layer thus likewise have first zones and second zones which differ with regard to their orientation properties.
  • the first regions of the first polymer layer preferably have varying polarization properties.
  • differently circularly polarizing first regions have opposite circularly polarizing properties (left-handed / right-handed circularly polarizing).
  • This makes it possible to encode a representation of an object as the first security feature, which changes upon rotation of the polarizer / foil element and possibly merges into another representation.
  • a first group of first areas is preferably assigned to the first object and a second group of first areas to the second object.
  • a grayscale image of an object as a security feature in the film element by means of such different first regions.
  • the first regions with different circularly polarizing properties have a smallest extent of less than 300 ⁇ m, so that an integral image results for the human observer at a normal viewing distance.
  • the film element preferably further has at least one transparent carrier layer, for example one or more polyester carriers having a layer thickness of 5 ⁇ m to 50 ⁇ m. It is thus possible to arrange the film element in the region of a transparent window of a security document and thus make it accessible for transmitted-light viewing.
  • at least one transparent carrier layer for example one or more polyester carriers having a layer thickness of 5 ⁇ m to 50 ⁇ m. It is thus possible to arrange the film element in the region of a transparent window of a security document and thus make it accessible for transmitted-light viewing.
  • the film element further comprises at least one replication layer, on which the first or the third polymer layer of a liquid crystal material is applied.
  • a diffractive structure for orientation of the polymer layer of a liquid crystal material is introduced in the polymer layer of a liquid crystal material facing surface of the replication layer in the first and third regions.
  • the diffractive structure serves to orient the anisotropic polymer material.
  • this provides a particularly effective way of producing a polymer layer which, in different regions, has different linear properties polarizing or the polarization direction rotating properties or has different circular polarizing properties.
  • These different properties are achieved, for example, by a different azimuth orientation of a linear grating used for the orientation of the liquid crystal material, for example a linear grating having a spatial frequency of 1,500 lines / mm to 3,500 lines / mm and a depth of 50 nm to 500 nm.
  • the film element has one or more further layers which provide a further, visually recognizable security feature for the human observer, preferably also in the first and third regions.
  • this can be achieved, as described above, by a combination of different cholesteric liquid crystal materials in the polymer layer.
  • an optically effective relief structure for example a Kinegram® or a hologram, in the film element.
  • HRI high refraction index
  • LRI low refraction index
  • microlens structures, matt structures or refractive macrostructures can also be used as optically effective relief structures.
  • the film element has a further layer with an optically active structure which provides a further optically recognizable security feature.
  • the further optically active structure superimposes the first and third regions at least in regions.
  • a thin-film layer system for producing color shifts by means of interference or a layer comprising an optically variable material, for example a layer with a luminescent material, in the foil element.
  • the film element is part of a film that forms an optical security element for securing value documents.
  • the film is shaped in the form of a securing thread.
  • the film element here is preferably part of a film, for example a laminating film, a transfer film or a sticker film, which is applied to a value document or a security document.
  • the region of the film which forms the film element is hereby preferably arranged in the region of a transparent window of the security document / value document.
  • the film may in this case also have further security features which, for example, stand out as reflective security elements outside the transparent window of the security document.
  • the security element also has a polarizer which can be brought into coincidence with the film element by folding or bending the security element and thus can be used by the user for verifying the first and second security feature.
  • a security document with a film element according to the invention is designed such that the film element is arranged in a transparent window of the security document.
  • the security document further has a polarizer which can be brought into coincidence with the film element by folding or bending the security document.
  • Fig. 1 1 shows a security document 1, a polarizer 5 and two representations 41 and 42.
  • the security document 1 is, for example, a banknote, a passport, a visa, a ticket or a software certificate.
  • the security document 1 has a carrier element 10 and a film 2 applied to the carrier element 10 or introduced into the carrier element.
  • the carrier element 10 consists for example of paper, a plastic material or a composite material of paper and plastic. Further, it is possible that the carrier element 10 is provided on one or both sides with one or more security printing layers.
  • the security document 1 has a transparent window 11.
  • the support member 10 has an opening.
  • the support element has transparent, optical properties.
  • the film 2 is applied to the carrier element 10 preferably in the form of a security strip or as a security patch or introduced as a security thread.
  • the film 2 is preferably applied to the carrier element 10 as a transfer layer of a hot stamping foil.
  • the film 2 it is also possible for the film 2 to be applied to the carrier body 10.
  • the film 2 is in this case applied to the carrier element 10 in such a way that the film 2 completely covers the region of the transparent window 11 and a region of the film 2 with a film element 20 is arranged in overlap with the region of the transparent window 11.
  • the film 2 in this case has an upper side 12 and a lower side 13 and comprises one or more film elements which provide security elements for checking the authenticity of the security document 1.
  • the film 2 comprises, for example, next to the film element 20, which -as in Fig. 1 shown - is arranged in the region of the transparent window 11, nor on another film element 21.
  • the film elements 20 and 21 are in this case each formed by portions of the film 2.
  • the film elements are formed by a subset of the layers of a film in a certain area of the film.
  • a non-inventive first film element 20 is exemplified in Fig. 3a clarified.
  • the imaging anisotropic polymer layers are on both sides of a support material.
  • An embodiment is also possible in which all anisotropic polymer layers are located on the same side of the support material. This construction will be in Fig. 3b and Fig. 3c and Fig. 5 described.
  • Fig. 3a shows the film element 20 with a top 12 and a bottom 13.
  • the film element 20 in this case has a protective lacquer layer 22, a layer 23, a polymer layer 24, a layer 25, a polymer layer 26, a carrier layer 27, a layer 28, a polymer layer 29 and an adhesive layer 30.
  • the film element may or may not have the protective lacquer layers 22 and 23.
  • the adhesive layer 30 represents an adhesive layer with which the security element is fixed on the carrier element 10.
  • the polymer layers 24 and 29 are the imaging anisotropic polymer layers.
  • Layers 25 and 28 are the orientation layers for the anisotropic polymer layers (e.g., replication layers, photopolymer layers, scratched polymer layers, etc.).
  • the polymer layer 26 is another anisotropic polymer layer. It can also consist of two different layers of two different anisotropic polymers or also comprise several regions of partially printed different anisotropic polymers.
  • the protective lacquer layer 22 preferably has a thickness of 0.3 to 1.2 ⁇ m.
  • the protective lacquer layer preferably consists of UV-crosslinkable acrylates or abrasion-resistant thermoplastic acrylates.
  • the protective lacquer layer 22 can also be dispensed with.
  • a transparent polyester support having a thickness of between 5 and 50 ⁇ m is provided. If the layer 22 is a transparent support, the layer 23 is formed by either an adhesive layer or an orientation layer for the anisotropic polymer layer 24, depending on the manufacturing process of the security element. In the latter case, the layer 25 can then be omitted.
  • Orientation layers 25 (or 23) and 28 may be e.g. Be replication layers, in which by means of a stamping tool diffractive structures are imprinted.
  • the replication layers preferably consist of a transparent, thermoplastic plastic material, which is applied to the protective lacquer layer 22, for example by a printing process.
  • the alignment layers may also consist of the same or other anisotropic polymers that are structured as mentioned above or otherwise.
  • the surface of the layer 26 can also be structured and serve directly as an orientation layer for the anisotropic polymer layer 24.
  • the layer 25 can then be dispensed with in this embodiment.
  • the embodiment will be described below as an element having two replication lacquer layers, ie the orientation layers 25 and 28 are formed by replicate varnish layers.
  • these replication lacquer layers have the following summary: component Parts by weight high molecular weight PMMA resin 2000 Silikonalkyd 300 nonionic wetting agent 50 low viscosity nitrocellulose 750 methyl ethyl ketone 12000 toluene 2000 diacetone 2500
  • the carrier layer 27 is a carrier film having a thickness of 5 to 50 ⁇ m made of a plastic material, for example a biaxially oriented polyester film or polyolefin film of this thickness.
  • the layer 26 is a polymer layer which has circularly polarizing properties in the entire region of the film element 20.
  • Layer 26 is the example Fig. 3 this is an oriented layer of cholesteric liquid crystal material.
  • cholesteric liquid crystal material for example, in WO 01/55960 described cholesteric liquid crystal materials.
  • the layer 26 in this case preferably has a layer thickness of 0.2 to 10 microns.
  • the liquid crystals of the layer 26 are oriented, for example, when the polymer layer 26 is doctored onto the carrier layer 27 by the shearing forces which occur in this case.
  • a further micro-scratched or brushed orientation layer is provided or the carrier layer 27 is micro-scratched or brushed on the surface facing the polymer layer 26 prior to application of the polymer layer 26 so as to enable orientation of the cholesteric liquid crystals.
  • the polymer layer 26 acts in its configuration as a cholesteric liquid crystal layer as a filter which reflects a specific wavelength portion of the incident light depending on the angle of incidence of the incident light and a specific wavelength portion of the light so that an angle-dependent color shift effect (against a dark background that absorbs the transmitted light) can be observed.
  • the replication lacquer layer 25 is applied to the layer 26 and patterned as an orientation layer.
  • the Replizierlack harsh is applied for example by means of a line grid gravure roll with a coating weight of 2.2 g / m 2 after drying, dried in a drying tunnel at a temperature of 100 to 120 ° C and then with a heated embossing roll or a heated die at about 130 ° C with a diffractive structure.
  • a UV-curable replicate varnish instead of a thermoplastic replication varnish and to mold the diffractive structures into the layer 25 by means of UV replication.
  • a high-lattice line grating for example with a resolution of 1,500 lines / mm to 3,500 lines / mm with a preferred depth of 50 nm 500 nm molded.
  • the azimuth angles of the line gratings can differ in regions, as a result of which different linearly polarizing or polarization-rotating properties in the polymer layer 24 can be achieved.
  • LC liquid crystal material
  • all of the liquid crystal materials cited in the aforementioned references are usable for the layer 25.
  • a nematic liquid crystal material from the OPALVA® series from Vantico AG, Basel / Switzerland, is used.
  • This liquid crystal material is applied over the entire surface or partially, preferably by means of a printing process, to the replication layer 25, preferably with an application weight, the at planar surface results in a layer thickness of 0.5 microns to 5 microns.
  • the after Application of the liquid crystal material locally forming effective layer thickness of the anisotropic polymer layer 24 and the alignment of the liquid crystal molecules of the polymer layer 24 is in this case influenced by the impressed into the replication layer 25 diffractive structure.
  • the liquid crystals of the anisotropic polymer layer 24 are aligned with the supply of heat as needed. This is followed by UV curing or thermally induced radical crosslinking of the liquid-crystal material to fix the orientation of the liquid-crystal molecules and the layer thickness of the anisotropic polymer layer 24.
  • the printed layer of a solvent-containing liquid crystal material is subjected to a drying process and the liquid crystal molecules orient during the evaporation of the solvent according to the diffractive structure. It is also possible that solvent-free liquid crystal material is applied by a printing process, after which the orientation is fixed by crosslinking.
  • the different orientation of the liquid-crystal molecules of the polymer layer 24 may take place by orientation of the liquid-crystal layer on a differently exposed photopolymer layer or on a layer provided by micro-scratching with a surface relief.
  • the polymer layer 24 has linearly polarizing properties, wherein due to the different azimuth angle of the diffractive structure in the regions 31 and 32, the polymer layer 24 in the regions 31 and 32 has different linearly polarizing properties.
  • the polymer layer 24 does not have special properties influencing the polarization of the incident light.
  • the azimuth angle of the diffractive structures in the areas 31 and 32 and thus the polarization axes are rotated by 90 ° from each other.
  • the areas 31 and 32 form image areas of a security feature representing object, for example a presentation by Clara Schumann.
  • Each of the regions 31 and 32 is in this case assigned to a pixel or to an image region of the object, with a region 31 or an area 32 being used for the respective pixel or image region, depending on the gray value.
  • three or more different types of such regions can be provided instead of two different types having differently linearly polarizing or polarization-rotating properties, in which, for example, the azimuth angle or the polarization axis differs by 10 ° in each case.
  • a representation in the manner of a gray-scale image can then be assembled as a security feature, so that - as explained later - when viewed in polarized light or by a polarizer depending on the angular position of the film element 20 to the polarizer / the light source In his gray scale changing gray scale image of the object becomes visible to the viewer.
  • the different types of areas are assigned to different objects and thus depending on the angular position of the film element 20 to the polarizer / the light source different objects as a security feature to the viewer are visible.
  • Layers 23 and 22 are optional protective layers that can protect the security element from mechanical damage (e.g., abrasion). Furthermore, these may be layers that serve decorative purposes and lead to an upgrading of the security feature. This layer could also be dispensed with.
  • the replication layer 28 and the polymer layer 29 are configured in the same way as the replication layer 25 and the polymer layer 24, with the difference that the surface relief molded into the replication layer 28 differs from that in FIG the replication layer 25 distinguishes molded surface relief and thus the polymer layer 29 has regions 35 to 37 which are different from the regions 31 to 33 and in which the polymer layer 29 has properties which vary in a linearly polarizing or polarization direction or have properties which do not change the polarization of the incident light , In the region 37, for example, the polarization of the incident light is not changed, in the regions 35 a linear polarization of the incident light corresponding to that in the regions 31 of the polymer layer 24 and in the regions 36 a linear polarization of the incident light according to the in Areas 32 of the polymer layer 24th
  • the arrangement and expansion of the regions 35 and 36 form a second security feature which, as explained with respect to the layers 24 and 25, consists of one or more mutually changing upon rotation of the angular position of the film element 20 and of the polarizer / light source Representations of one or more objects exists.
  • This second security feature differs from the security feature provided by the areas 31 and 32, for example in that different objects or a different number of objects are encoded by the areas 35 and 36 or 31 and 32 or the objects in different angular position of the film element 20 to the polarizer / light source, ie, the linearly polarizing or polarization direction rotating characteristics of the regions are different.
  • the adhesive layer 30 is preferably a thermally activatable adhesive layer which serves to apply the film 2 to the carrier element 10 of the security document 1.
  • the adhesive layer 30 in the area of the film element 20 is not provided, or that it is the adhesion layer 30 is a pressure-activatable cold-adhesive layer.
  • the carrier with the layer package is turned and provided on the back with the replication layer 28. This is structured as described above and then provided with the anisotropic polymer layer 29.
  • an adhesive layer 30 is applied to fix the security element on the desired carrier element.
  • the film element 20 may have, in addition to the layers 22 to 30, one or more further layers, in particular one or more further layers, which provide a further, optically recognizable security feature.
  • the polymer layer 26 is designed in the form that it consists of two layers of different cholesteric liquid crystal materials, one obtains a different color impression here on the viewing side.
  • the polymer layer 26 is designed such that it consists of two or more different liquid crystal materials partially applied in two or more regions, several different color impressions-or colored image information as a first-line feature-can be integrated (see also FIG Fig. 5 ).
  • the film element 20 When viewed in transmitted light by means of unpolarized light / without a polarizer, the film element 20 appears as a transparent window both when viewed from the front and when viewed from the back, possibly with a slight color impact.
  • the representation 41 or 42 is this is a simple linear polarizer.
  • the areas 31 and 32 are arranged corresponding to the objects shown in the representations 41 and 42, ie, the points appearing dark in the illustration 41 are underlaid with areas 31 and the bright areas are underlaid with areas 32, so that upon a change the angular position between the polarizer 5 and the security document 1 by 90 °, the representation 42 results.
  • the representations 41 and 42 likewise result, with the difference that here additionally the above-described color shift effect occurs.
  • the same polarization effects generated by the polymer layers 24 and 29 do not overlap in the case of transmitted light and reflected-light observation and can be read selectively depending on the viewing direction by means of a linear polarizer.
  • Essential for this is the arrangement of the polymer layer 26 with circularly polarizing properties between the two polymer layers 24 and 29 with the linearly polarizing / the polarization direction rotating properties.
  • a nematic liquid crystal material for the polymer layer 26 can be used, which has circular polarizing properties. Furthermore, it is also possible for the polymer layer 26 to have different circularly polarizing properties in regions, for example circular-polarizing in the right-hand region in a first region Has properties and in a second region left handed circularly polarizing properties, but it is required that the circular polarizing properties of the layer 26 be present in all areas 31, 32, 35 and 36, in which the polymer layers 24 and 29 linearly polarizing / the polarization direction rotating Own properties.
  • FIG. 3c An embodiment of the security element as a hot or cold stamping foil is in Fig. 3c shown. Deviating from the structure in Fig. 3b here is an additional release layer 38 on the carrier layer 27, which is followed by the layer package 24-29.
  • the adhesive layer 30 is in this case as a final layer following the layer package 24-29.
  • the carrier layers 63, 69 and 73 are preferably polyester or polyolefin films having a thickness of between 5 ⁇ m and 50 ⁇ m.
  • Structures for orienting the liquid crystals of the polymer layer 65 are formed in the regions of the reptification layer 64 in regions 74 and 75.
  • the polymer layer 65 is formed by a layer of a cholesteric liquid crystal material which is applied to the replication layer 64 by means of a printing process and then oriented in the regions 74 and 75 by the surface relief of the replication layer 64 and then fixed by cross-linking. In the regions 76 in which no surface relief is formed in the replication layer 64, the polymer layer 65 shows no properties influencing the polarization of the light.
  • the polymer layer 65 is partially printed on the replication layer only in the areas in which circularly polarizing properties are to be present.
  • different liquid crystal materials are preferably printed in different areas, for example in the areas 74 a right-handed circularly polarizing liquid crystal material and in the areas 75 a left-handed circularly polarizing liquid crystal material.
  • cholesteric liquid crystal materials which also show a color change in the oriented state
  • a nematic liquid crystal material or a plurality of nematic liquid crystal materials which have circularly polarizing properties with appropriate adjustment of the layer thickness.
  • the replication layer 64 and the polymer layer 65 With regard to the detailed configuration of the replication layer 64 and the polymer layer 65, reference is made to the explanations regarding the layers 23, 24 and 26 Fig. 3a directed. Furthermore, it is also possible to dispense with the replication layer 64, to prepare the carrier layer 63 over the entire surface by mechanical scratching or brushing for the orientation of liquid crystal and to partially print liquid crystal material having circularly polarizing properties onto the carrier layer 63, so that a security feature is provided, for example, in US Pat Form of a representation of an object from the shape and arrangement of these areas results.
  • the replication layer 72 and the polymer layer 71 are constructed like the replication layer 64 and the polymer layer 65, with the difference that the circularly polarizing properties of the polymer layer 71 are present in regions 77 and 78 and are not present in regions 79 of the polymer layer 71, so that here a second security feature from the shape and arrangement of the areas 77 and 78 results.
  • the polymer layer 67 is a layer of an oriented liquid crystal material having linear polarizing properties in all of the regions 74, 75, 77 and 78.
  • the polymer layer 67 has regionally different linearly polarizing properties, For example, the polarization axis is rotated in areas 81 and in areas 82 against each other.
  • the polymer layer 67 is in this case on the replication layer 68, in which a corresponding surface relief for the orientation of the polymer layer 67 is formed, according to the above descriptions with respect to the layers 23 and 24 after Fig. 3a applied, oriented and then fixed.
  • the layers 64, 65 and 66 are applied one after the other to the carrier layer 63. Further, the layer 68 and then the layer 67 is applied to the carrier layer 69. Further, the layers 72, 71 and 70 are applied to the carrier layer 73. Subsequently, the (parallel) produced laminating in the in Fig. 4 superposed sequence and connected by activation of the adhesive layers 70 and 66 together.
  • the object represented by the regions 74 and 75 is visible, the object represented by the regions 77 and 78 remaining hidden.
  • the object / objects defined by the regions 77 and 78 remains the object defined by the regions 74 and 75 hidden.
  • a gray-scale image can be coded into the layers 65 and 71, for example, dark regions of an object being deposited by the regions 74, bright regions of the object being deposited by the regions 75, and light gray regions of the object being deposited by regions 76 .
  • An inverse representation of the object can be generated by using an oppositely circular polarizing polarizer as another security element.
  • a further security feature which can be read out by means of a linear polarizer can furthermore be coded into the film element 6.
  • the film element 6 - When viewed in unpolarized light, the film element 6 - as already explained with reference to the film element 20 - appears as a transparent window, regardless of whether the film element is viewed from the front 61 or from the back 62.
  • the polymer layer 29 is divided into regions 34 and 35.
  • layer 29 is formed of different anisotropic polymers.
  • two or more different cholesteric liquid crystal materials with different color properties are partially applied in the decor.
  • a cholesteric liquid crystal material is applied in the areas 34, which shows a blue-green color change during tilting and applied in the region 35 a cholesteric liquid crystal material which shows a red-green color change on tilting.
  • This special embodiment of the central anisotropic layer 29 generates an additional first-line feature. Hierbeier appear under tilting of the element partially different color impressions that can reproduce image information with appropriate design. In review, this first-line feature is invisible.

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  • Business, Economics & Management (AREA)
  • Accounting & Taxation (AREA)
  • Finance (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Polarising Elements (AREA)
  • Laminated Bodies (AREA)

Claims (11)

  1. Elément en feuille (20, 6), en particulier feuille à estamper, feuille de plastification ou feuille autocollante, avec une face supérieure (12, 61) et une face inférieure (13, 62),
    sachant que l'élément en feuille (20, 6) comprend une première couche de polymère (24, 65) composée d'un matériau à base de cristaux liquides au moins partiellement orientés, la première couche de polymère comportant une ou plusieurs premières zones (31, 32 ; 74, 75) constituant un premier signe distinctif de sécurité, dans lesquelles la couche de polymère possède des propriétés de polarisation circulaire, que l'élément en feuille (20, 6) comprend une troisième couche de polymère (29, 71) composée d'un matériau à base de cristaux liquides au moins partiellement orientés, la troisième couche de polymère comportant une ou plusieurs troisièmes zones (35, 36 ; 77, 78) constituant un deuxième signe distinctif de sécurité, dans lesquelles la couche de polymère possède des propriétés de polarisation circulaire, et que l'élément en feuille (20, 6) comprend une deuxième couche de polymère (26, 67), qui est disposée entre la première et la troisième couches de polymère et qui possède des propriétés de polarisation linéaire ou de rotation de la direction de polarisation dans les zones disposées en dessous des premières zones et dans les zones disposées au-dessus des troisièmes zones, l'élément en feuille (20, 6) étant constitué de trois ou plus de trois couches transparentes (22 à 30 ; 63 à 73), la première, la deuxième et la troisième couches de polymère formant chacune une des couches transparentes, le premier ou le deuxième signe distinctif de sécurité étant sélectivement visible pour l'observateur humain en cas d'observation par un polarisateur ou au moyen de lumière polarisée en lumière transmise, en fonction de la direction d'observation, et le premier signe distinctif de sécurité et/ou le deuxième signe distinctif de sécurité comprenant deux ou plusieurs premiers objets auxquels sont associées respectivement des premières ou des troisièmes zones ayant des propriétés de polarisation circulaire différentes.
  2. Elément en feuille (20, 6) selon la revendication 1,
    caractérisé en ce
    que les premières et les troisièmes zones se chevauchent au moins par endroits, le premier ou le deuxième signe distinctif de sécurité étant sélectivement visible pour l'observateur humain dans une seule et même zone en cas d'observation en lumière transmise par un polarisateur ou au moyen de lumière polarisée, selon le côté d'observation.
  3. Elément en feuille (20, 6) selon l'une quelconque des revendications précédentes,
    caractérisé en ce
    que la première et/ou la deuxième couches de polymère sont constituées d'un matériau à base de cristaux liquides cholestériques qui génère, en cas d'observation en lumière incidente, un effet de décalage chromatique fonction de l'angle d'observation comme signe distinctif de sécurité supplémentaire optiquement perceptible.
  4. Elément en feuille selon la revendication 3,
    caractérisé en ce
    que la couche de polymère constituée d'un matériau à base de cristaux liquides cholestériques ou une des couches de polymère constituées d'un matériau à base de cristaux liquides cholestériques est prévue par endroits dans l'élément en feuille, afin de générer par endroits des effets chromatiques différents.
  5. Elément en feuille (20, 6) selon l'une quelconque des revendications précédentes,
    caractérisé en ce
    que les premières et/ou troisièmes zones possèdent une étendue respective inférieure à 300 µm, et les propriétés de polarisation d'au moins deux des premières zones (31, 32 ; 74, 75) et/ou deux des troisièmes zones (35, 36 ; 77, 78) sont différentes.
  6. Elément en feuille (20, 6) selon l'une quelconque des revendications précédentes,
    caractérisé en ce
    que l'élément en feuille comporte au moins une couche de réplication (23, 28 ; 64, 72) sur laquelle est apposée la première ou la troisième couche de polymère (24, 65 ; 29, 71) composée d'un matériau à base de cristaux liquides, et en ce qu'une structure diffractive, destinée à orienter la couche de polymère composée d'un matériau à base de cristaux liquides, est introduite dans les premières ou respectivement les troisièmes zones (31, 32, 35, 36 ; 74, 75, 77, 78) dans la surface de la couche de réplication (23, 28 ; 64, 72) qui est tournée vers la couche de polymère composée d'un matériau à base de cristaux liquides.
  7. Elément en feuille (20, 6) selon la revendication 6,
    caractérisé en ce
    que la structure diffractive est un réseau de lignes ayant une fréquence spatiale de 1500 lignes/mm à 3500 lignes/mm et une profondeur de 50 nm à 500 nm.
  8. Elément en feuille (20, 6) selon la revendication 7,
    caractérisé en ce
    que le réseau de lignes possède par endroits une orientation azimutale différente.
  9. Elément en feuille (6) selon l'une quelconque des revendications précédentes,
    caractérisé en ce
    que l'élément en feuille comporte un système de couches (69) à film mince pour produire un décalage chromatique par interférence, qui fournit un signe distinctif de sécurité supplémentaire optiquement perceptible.
  10. Elément en feuille (6) selon la revendication 9,
    caractérisé en ce
    que le système de couches (69) à film mince recouvre au moins par endroits les premières et troisièmes zones.
  11. Document sécurisé (1) comprenant un élément en feuille (20) selon la revendication 1.
EP08749389A 2007-05-09 2008-05-07 Élément en feuille à couche de polymère Active EP2144731B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007022264A DE102007022264A1 (de) 2007-05-09 2007-05-09 Folienelement mit Polymerschicht
PCT/EP2008/003694 WO2008138539A1 (fr) 2007-05-09 2008-05-07 Élément en feuille à couche de polymère

Publications (2)

Publication Number Publication Date
EP2144731A1 EP2144731A1 (fr) 2010-01-20
EP2144731B1 true EP2144731B1 (fr) 2012-03-21

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US (1) US20100304053A1 (fr)
EP (1) EP2144731B1 (fr)
AT (1) ATE550202T1 (fr)
DE (1) DE102007022264A1 (fr)
WO (1) WO2008138539A1 (fr)

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KR102286874B1 (ko) * 2014-10-20 2021-08-09 한국전자통신연구원 다중 방향성 적분 이미지를 이용한 객체 검출 장치 및 방법
JP6927886B2 (ja) * 2015-05-26 2021-09-01 ロリク アーゲーＲｏｌｉｃ Ａｇ 光学セキュリティ装置
DE102016013690A1 (de) * 2016-11-16 2018-05-17 Giesecke+Devrient Currency Technology Gmbh Sicherheitselement mit Subwellenlängengitter
DE102016013683A1 (de) * 2016-11-16 2018-05-17 Giesecke+Devrient Currency Technology Gmbh Sicherheitselement mit Subwellenlängengitter
DE102018121767A1 (de) 2018-09-06 2020-03-12 Kommanditgesellschaft Synoptrix Lichttechnik Gmbh & Co. Herstellungsverfahren eines Dekorelements und Verwendung des Dekorelements
WO2024181214A1 (fr) * 2023-02-28 2024-09-06 日本ゼオン株式会社 Support d'affichage optique et son procédé d'utilisation

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ATE550202T1 (de) 2012-04-15
DE102007022264A1 (de) 2008-11-13
WO2008138539A1 (fr) 2008-11-20
US20100304053A1 (en) 2010-12-02
EP2144731A1 (fr) 2010-01-20

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