EP3392054A1 - Polymeric valuable document substrate, security element, valuable document and method of manufacturing - Google Patents

Polymeric valuable document substrate, security element, valuable document and method of manufacturing Download PDF

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Publication number
EP3392054A1
EP3392054A1 EP18000368.3A EP18000368A EP3392054A1 EP 3392054 A1 EP3392054 A1 EP 3392054A1 EP 18000368 A EP18000368 A EP 18000368A EP 3392054 A1 EP3392054 A1 EP 3392054A1
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EP
European Patent Office
Prior art keywords
layer
polymeric
liquid crystal
crystal material
value document
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
EP18000368.3A
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German (de)
French (fr)
Inventor
Winfried HOFFMÜLLER
Manfred Heim
Thomas Mang
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
Priority to DE102017003795.7A priority Critical patent/DE102017003795A1/en
Application filed by Giesecke and Devrient Currency Technology GmbH filed Critical Giesecke and Devrient Currency Technology GmbH
Publication of EP3392054A1 publication Critical patent/EP3392054A1/en
Application status is Pending legal-status Critical

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B42BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42DBOOKS; 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
    • B42D25/00Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/20Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
    • B42D25/24Passports
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B42BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42DBOOKS; 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
    • B42D25/00Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/20Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
    • B42D25/29Securities; Bank notes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B42BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42DBOOKS; 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
    • B42D25/00Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30Identification or security features, e.g. for preventing forgery
    • B42D25/324Reliefs
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B42BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42DBOOKS; 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
    • B42D25/00Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30Identification or security features, e.g. for preventing forgery
    • B42D25/328Diffraction gratings; Holograms
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B42BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42DBOOKS; 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
    • B42D25/00Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30Identification or security features, e.g. for preventing forgery
    • B42D25/351Translucent or partly translucent parts, e.g. windows
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B42BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42DBOOKS; 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
    • B42D25/00Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30Identification or security features, e.g. for preventing forgery
    • B42D25/355Security threads
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B42BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42DBOOKS; 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
    • B42D25/00Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30Identification or security features, e.g. for preventing forgery
    • B42D25/36Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/364Liquid crystals
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B42BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42DBOOKS; 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
    • B42D25/00Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30Identification or security features, e.g. for preventing forgery
    • B42D25/36Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/373Metallic materials
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B42BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42DBOOKS; 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
    • B42D25/00Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30Identification or security features, e.g. for preventing forgery
    • B42D25/36Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/378Special inks
    • B42D25/391Special inks absorbing or reflecting polarised light
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B42BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42DBOOKS; 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
    • B42D25/00Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/40Manufacture
    • B42D25/405Marking
    • B42D25/425Marking by deformation, e.g. embossing
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B42BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42DBOOKS; 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
    • B42D25/00Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/40Manufacture
    • B42D25/45Associating two or more layers

Abstract

The invention relates to a polymeric value document substrate or security element comprising a polymeric support provided in a predetermined area in sequence with a replication layer and a liquid crystal material layer doped with at least one dichroic dye, wherein the surface of the replication layer facing the liquid crystal material layer is one with dichroic Dye-doped liquid crystal material layer aligning relief structure is embossed and embossed relief structure has at least two areas with different orientation directions.

Description

  • The invention relates to a polymeric value document substrate, a security element for securing value documents, a value document and a method for producing the polymeric value document substrate and the security element.
  • In the context of the invention, a value document may in particular be banknotes, but also shares, certificates, stamps, checks, tickets, tickets, air tickets, security paper and the like.
  • Security elements for securing value documents are in particular security threads, security strips or security patches or security labels.
  • Polymer value document substrates for the production of value documents, in particular banknotes, are known in the art, see eg EL Prime, DH Solomon: "Australia's Plastic Banknotes: an effective weapon against counterfeiting," Angew. Chem., 2010, 122, pp. 2-13 ,
  • Furthermore, it is known to provide value documents or security elements for securing value documents with security features based on liquid-crystalline material, see, for example WO 2005/037570 A2 . WO 2005/105475 A1 . WO 2007/140887 A2 . WO 2008/067932 A2 . WO 2008/067932 A2 and EP 1894736 A2 ,
  • The EP 2508358 A1 describes a doped with a dichroic dye liquid crystalline material in the form of a layer that emits in fluorescence linearly polarized light, to secure a value document. The observer can perceive hidden motives when viewing with polarized light, both when viewing the front and the back.
  • For double-sided see-through elements, such as in the EP 2508358 A1 However, significant amounts of liquid crystals and dichroic dyes are needed. Furthermore, verifying the authenticity of the respective value document requires a closer look at both the front and back of the value document, which is cumbersome and time consuming.
  • It is therefore an object of the present invention to provide an improved polymeric value document substrate for making value documents, an improved security document security document, a value document based on the polymeric value document substrate, a security document containing value document, and methods of making the polymeric value document substrate and security element.
  • These objects are achieved by the features of the independent claims. Further developments are the subject of the dependent claims.
  • Summary of the invention
    • 1. (First aspect of the invention) A polymeric value document substrate or security element comprising a polymeric support disposed in a predetermined area in sequence with a replication layer and a security layer is provided with at least one dichroic dye-doped liquid crystal material layer, wherein in the liquid crystal material layer facing surface of the replication layer embossed with the doped dichroic dye liquid crystal material layer relief structure is embossed and the embossed relief structure has at least two regions with different orientation directions.
    • 2. (Preferred Embodiment) Polymeric value document substrate or security element according to Clause 1, wherein the relief structure impressed into the replication layer has at least two regions with orientation directions arranged orthogonally to one another.
    • 3. (Preferred Embodiment) A polymeric value document substrate or security element according to clause 1, wherein the relief structure embossed in the replication layer has at least three regions with different orientation directions, the three orientation directions taking angles relative to each other, in particular from the group consisting of 0 °, 45 ° , 90 ° and 135 ° are selected.
    • 4. (Preferred Embodiment) A polymeric value document substrate or security element according to clause 1, wherein the relief structure embossed in the replication layer has at least four regions with different orientation directions, the four orientation directions relative to each other taking in particular the angles 0 °, 45 °, 90 ° and 135 ° ,
    • 5. (Preferred Embodiment) A polymer value document substrate or security element according to any one of clauses 1 to 4, wherein the relief structure embossed in the replication layer, having a plurality of regions of different orientation directions and aligning the dichroic dye-doped liquid crystal material layer, is a hidden one Motivated in the dichroic dye-doped liquid crystal material layer, which is visible to the viewer when illuminated with polarized light to the naked eye.
    • 6. (Preferred Embodiment) A polymeric value document substrate or security element according to any one of clauses 1 to 4, wherein the liquid crystal material layer embossed relief structure embossed in the replication layer and having a plurality of differently orientated directions and doped with dichroic dye has at least two hidden motifs in the dichroic dye-doped liquid crystal material layer which are visible to the viewer when illuminated with polarized light to the naked eye by rotation of the polarization direction of the polarized light.
    • 7. (Preferred Embodiment) A polymeric value document substrate or security element according to any one of clauses 1 to 6, wherein the liquid crystal material layer is doped with different dichroic dyes, preferably differently oriented liquid crystal material layer regions having different dichroic dyes.
    • 8. (Preferred Embodiment) A polymeric value document substrate or security element according to any one of clauses 1 to 7, wherein the relief structure embossed in the replication layer, having at least two regions of different orientation directions and the dichroic dye-doped liquid crystal material layer, is a diffractive structure.
    • 9. (Preferred Embodiment) A polymeric value document substrate or security element according to clause 8, wherein the diffractive structure has a first region for orientation of liquid crystal material derived from the Liquid crystal material layer is covered, and a second region for generating a diffractive optical effect, in particular for generating a hologram has.
    • 10. (Preferred Embodiment) A polymeric value document substrate or security element according to clause 8 or 9, wherein the diffractive structure has a region in which the diffractive structure is formed from a superposition of a coarse structure to produce an optical effect having a fine structure of higher spatial frequency for orientation of the liquid crystal material In particular, the fine structure is formed with a period of less than 400 nm and the coarse structure is formed, in particular, with a period of 500 nm to 1 micrometer.
    • 11. (Preferred Embodiment) A polymeric value document substrate or security element according to any one of clauses 1 to 10, wherein the liquid crystal material layer doped with at least one dichroic dye covers the replication layer in a patterned manner.
    • 12. (Preferred Embodiment) A polymeric value document substrate or security element according to any one of clauses 1 to 11, wherein the polymeric support has an opaque, printable and printable color layer outside the predetermined region provided with the replication layer and the liquid crystal material layer.
    • 13. (Preferred Embodiment) A polymeric value document substrate or security element according to clause 12, wherein both the opaque, printable and printable color layer and the dichroic dye-doped liquid crystal material layer and / or the replication layer are partially coated with a patterned, printable, platelet-shaped Metallic pigments based reflective layer are provided.
    • 14. (Preferred Embodiment) A polymeric value document substrate or security element according to any one of clauses 1 to 13, wherein the polymeric carrier is a film, a film / paper / film composite substrate, or a paper / film / paper composite substrate.
    • 15. (Preferred Embodiment) A polymeric value document substrate according to any one of clauses 1 to 14, wherein the polymeric value document substrate is suitable for producing value documents, in particular banknotes.
    • 16. (Preferred embodiment) Security element according to one of the clauses 1 to 14, wherein the security element is suitable for securing value documents, in particular banknotes, and is preferably a security thread, a security strip or a security patch.
    • 17. (Second aspect of the invention) A value document, in particular a banknote, comprising the polymeric value document substrate or security element according to one of the clauses 1 to 16.
    • 18. (Third aspect of the invention) A method of manufacturing a polymeric value document substrate or security element according to any one of clauses 1 to 17, comprising:
      • providing a polymeric carrier;
      • optionally, providing the polymeric carrier with a recessed, opaque, printable ink layer;
      • applying a replication layer to the polymeric support;
      • providing the replication layer with an impressed relief structure, the at least two areas with different orientation directions and is suitable for aligning a liquid crystal material layer doped with at least one dichroic dye;
      • the application of a liquid crystal material layer doped with at least one dichroic dye onto the replication layer having the embossed relief structure.
    • 19. (Preferred Embodiment) A method of making a polymeric value document substrate or security element according to clause 18, wherein the step of providing the polymeric carrier with a recessed, opaque, printable ink layer is mandatory and the replication layer in the areas of the recesses of the color layer on the polymeric Carrier is applied.
    • 20. (Preferred Embodiment) The method of clause 19, wherein the step of providing the polymeric support with a recessed, opaque, printable color layer in the form of a first color layer, applies the replication layer in the areas of the recesses of the first color layer to the polymeric substrate is applied to the at least one dichroic dye-doped liquid crystal material layer on the embossed relief structure having replication layer and another opaque, printable ink layer in the form of a second color layer is applied to the first color layer, that the second color layer, the liquid crystal material layer and / or the Partially covering the replication layer.
    • 21. (Preferred Embodiment) The method of clause 19, wherein the step of providing the polymeric support is with a recessed, opaque, printable ink layer, applying the replication layer in the areas of the ink layer recesses to the polymeric support having at least one doped dichroic dye Liquid crystal material layer is applied to the embossed relief structure having replication layer and a platelet-shaped metal pigments based reflective layer is applied so that it covers both the opaque, printable ink layer and the liquid crystal material layer and / or the replication layer in part.
    Detailed Description of the Preferred Embodiments
  • In the method according to the invention for producing a polymeric value-document substrate, a sheet-like polymeric material is preferably first printed with a dye-receiving layer, for example by means of a gravure printing machine. The ink accepting layer may preferably be printed on the polymeric value document substrate such that there are recesses for creating see-through windows in the ink accepting layer. Alternatively, instead of a single ink accepting layer, a plurality of ink accepting layers may be printed, such as in U.S. Pat WO 2010/130755 A2 described. The ink-accepting layer is in particular an opaque, printable and printable color coat. The ink for forming the ink receiving layer is preferably based on a filler, eg, silica gel, a crosslinker and a binder. As binders, for example, polyvinyl alcohol, modified polyvinyl alcohol, polyurethane dispersions, acrylate dispersions, as well as derivatives or mixtures thereof are used. The crosslinker can be chosen in particular from the substance class isocyanate, aziridine, carbodiimide or glycidyl ether. Furthermore, additives, for example flow additives, deaerators and / or monoprotic acids, may be present. Instead of silica gel, the filler may be a pigment or a mixture of several pigments of the group consisting of boehmite, pseudo-boehmite, zeolite and Al 2 O 3 . Furthermore, pigments may contain to increase opacity be, for example, TiO 2 , BaSO 4 , CaCO 3 , silicic acids, or polymer-based hollow sphere pigments such as "ROPAQUE" from Rohm & Haas or effect pigments that produce a pearlescent or a metallic luster.
  • A replication layer is then applied to the ink receiving layer provided with the ink receiving layer in the area of the recesses of the ink receiving layer, e.g. a UV varnish. The replication layer is provided in a subsequent step with a relief structure, in particular by means of embossing. The replication layer provided with a relief structure can be applied in any application or printing method, e.g. by means of an inkjet, gravure, flexographic or screen printing process, a liquid crystal material doped with at least one dichroic dye is applied. The application of the liquid-crystalline substance can be carried out in particular from the melt at elevated temperature or with the aid of a solvent at room temperature. After a certain time (for example, a web feed of about 4 m at a web speed of about 100 m per minute, the temperature is adjusted according to the type of liquid crystalline material and the temperature stability of the web-shaped polymeric material, for example in a range of 70 ° C to 110 ° C. ), the liquid-crystalline layer doped with at least one dichroic dye is aligned by means of the relief structure impressed into the replication layer and can be crosslinked by UV radiation. The crosslinking of the liquid-crystalline layer preferably proceeds in an inertized state, the proportion of the residual oxygen should be in particular less than 1000 ppm.
  • In optional further steps, additional layers may be applied to facilitate further optical effects. In particular, by printing technology, a reflection layer based on platelet-shaped metal pigments can be produced, wherein the platelet-shaped metal pigments preferably are such that they align spatially along the relief structure of an embossing lacquer layer. The metal pigments are based, in particular, on a metal selected from the group consisting of aluminum, stainless steel, nichrome, gold, silver, platinum and copper, preferably on aluminum, where the average particle diameter is preferably in a range from 2 μm to 50 μm, more preferably in one Range of 5 microns to 15 microns. The metallization obtained in this way appears in the form of a silver mirror layer. Such platelet-shaped metal pigments are for example from WO 2013/186167 A2 . WO 2010/069823 A1 . WO 2005/051675 A2 (See, for example, the description on page 11, line 10, to page 12, penultimate paragraph) and WO 2011/064162 A2 known. Platelet-shaped metal pigments have the advantage that they conform to a substrate having a relief structure, in particular a relief with microstructures and / or nanostructures, so well that the difference to a conventional metallization obtainable by vapor deposition is almost no longer recognizable. The simple, technical printing production of the reflection layer makes it possible to dispense with complex process steps, such as printing the substrate with a soluble wash in the form of a desired recess within the reflective layer to be generated, generating a metallization by vapor deposition and washing the washing color together with the above the washing paint applied metallization. In addition, the metal pigment compositions (eg, yellow) may be colored.
  • The reflection layer based on platelet-shaped metal pigments described above is particularly suitable in the case of an underlying, with insufficient edge sharpness arranged liquid crystal layer as a mask for masking the areas of the deficient liquid crystal layer.
  • The application of the reflective layer based on platelet-shaped metal pigments as a mask is merely optional. As a mask for masking the regions of the liquid crystalline layer having a lack of edge sharpness (that is, having irregular edges), in the simplest case, the ink accepting layer itself may be used. In this case, a part of the ink-accepting layer can be applied to the polymeric substrate in the form of a first ink-accepting layer before the application of the liquid-crystalline material (in particular before the application of the replication layer). Another portion of the ink accepting layer may be printed after application of the replication layer and the liquid crystalline material in the form of a second ink accepting layer for masking the portions of the edge sharpness liquid crystal layer. The measure of disposing the first ink accepting layer before applying the liquid crystal layer is further associated with the advantage that when viewing the polymeric value document substrate from the side opposite the ink accepting layer, i. E. When viewed through the substrate, a visually appealing boundary of the liquid-crystalline region can be generated.
  • The polymeric value document substrate prepared in this manner may be coated in optional further steps with further layers, e.g. a primer layer, a protective lacquer or a thin protective film, are provided.
  • Suitable dichroic dyes for use in liquid crystal polymer networks are known in the art. In particular, the dichroic dye may have a functional group which enables the dye to be incorporated into the network. An example is dyes having an acrylate head group (which can be incorporated, for example, into the network of liquid crystal diacrylates). Furthermore, the Absorb dichroic dye in the visible wavelength range, but also show fluorescence and be excitable eg with UV light. Liquid crystals on their own show no noticeable light absorption or light reflection. The light absorption is determined by the dichroic dye. Suitable examples are fluorescent dyes with polarized fluorescence, such as fluorescent dyes with a 9,10-Diphenylanthracen fluorophore or a coumarin fluorophore. A blue anthraquinone dye and a red azo dye for incorporation into liquid crystalline polymer networks are disclosed, for example, in U.S. Pat WO 02/37147 A1 described.
  • Suitable polymeric supports upon which the novel polymeric value document substrate is based are known in the art. For example, BOPP films are suitable, especially in the form of coextruded laminates such as an LLDPE / BOPP / LLDPE film, in particular two or three such films may be hot laminated to form a LLDPE / BOPP / LLDPE / LLDPE / BOPP / LLDPE layer sequence or the like to build. Suitable polymeric carriers are further a film / paper / film composite substrate, see, for example, U.S. Pat WO 2004/028825 A2 , or a paper / foil / paper composite substrate.
  • However, the above-described method for producing a polymeric value document substrate is also suitable for producing security elements for securing value documents, in particular film-like security elements such as security threads, film strips, patches or labels. Such a security element is based in particular on a plastic film on which an optional ink-receiving layer is applied. Such a security element can be applied, for example, by means of an adhesive layer (such as a heat seal adhesive layer) directly on a security document to be secured or prepared on a separate carrier as a transfer element. Plastics such as PET are used for the film material (Polyethylene terephthalate), PBT (polybutylene terephthalate), PEN (polyethylene naphthalate), PP (polypropylene), PA (polyamide) and PE (polyethylene). This sheet material may also be monoaxially or biaxially stretched. PET as a plastic film for the production of security elements is preferred.
  • Further advantages and embodiments of the invention will be explained in more detail with reference to FIGS. The proportions shown in the figures, in particular layer thicknesses, do not necessarily correspond to the conditions present in reality and serve primarily to improve the clarity.
  • Show it:
  • FIG. 1
    a polymeric value document substrate of the invention;
    Figures 2-4
    the production of a novel polymeric value document substrate according to a first embodiment;
    FIG. 5
    a polymeric value document substrate according to the invention according to a second embodiment;
    Figures 6-7
    the see-through window portion of the polymeric value document substrate when illuminated with polarized light, wherein depending on the rotation of the polarization direction of the polarized light, a different appearance can be seen;
    FIG. 8
    a polymeric value document substrate according to the invention according to a third embodiment;
    FIG. 9
    a polymeric value document substrate according to the invention according to a fourth embodiment;
    FIG. 10
    a banknote with security elements according to the invention.
  • FIG. 1 shows a polymeric value document substrate 1 according to the invention, which is suitable for the production of a banknote. The value document substrate is based on a polymeric support, in this case a polymer film with the layer sequence LLDPE / BOPP / LLDPE / LLDPE / BOPP / LLDPE. The value document substrate 1 has a see-through window area 2 with a hidden motif, which is visible to the viewer when illuminated with polarized light with the naked eye. Depending on the rotation of the polarization direction of the polarized light different motives are perceptible. In the area outside the see-through window 2, the value document substrate 1 is provided with a white, opaque ink acceptance layer.
  • FIGS. 2 to 4 each illustrate in cross-sectional view the production of the in the FIG. 1 shown polymeric value document substrate 1 according to a first embodiment.
  • According to the FIG. 2 For example, the polymeric carrier 3 is first provided with a dye accepting layer 4 by means of a gravure printing process. The ink accepting layer 4 is available from a printing ink based on silica gel, a crosslinking agent, a leveling additive and a binder, and has a recess in the central area. In the region of the recess of the ink-accepting layer, the polymeric carrier 3 is provided with a UV varnish in a subsequent step. In the UV varnish is then a Embossed relief structure in order to obtain in this way provided with an embossed relief structure replication layer 5.
  • According to the FIG. 3 In an optional step, a further ink-receiving layer 6 is applied so as to cover the ink-receiving layer 4 underneath and partly the replication layer 5 provided with an embossed relief structure. The additional ink receiving layer 6 is merely preferred and serves as a kind of mask for masking registration variations between the ink accepting layer 4, the replication layer 5 provided with an embossed relief structure, and the liquid crystal layer still to be applied.
  • According to the FIG. 4 the application of a liquid crystal material layer 7 doped with a dichroic dye takes place by means of a screen printing process. The application of the liquid-crystalline substance takes place from the melt at elevated temperature. After a certain time, namely a web feed of about 4m at a web speed of about 100m per minute, the temperature is adjusted according to the nature of the liquid crystalline material and the temperature stability of the web-shaped polymeric material, for example in a range of 70 ° C to 110 ° C. , the liquid-crystalline layer 7 doped with at least one dichroic dye is aligned by means of the relief structure impressed into the replication layer 5 and can be crosslinked by UV radiation.
  • FIG. 6 shows the see-through window area 2 of the polymeric value document substrate 1 when illuminated with polarized light. When illuminated with polarized light, eg when illuminated by means of a mobile phone or notebook display, the observer perceives a hitherto hidden motif with the naked eye. Depending on the choice of dichroic dye and liquid crystalline polymer network, the black hatched area is for the viewer eg in the color dark blue or dark red perceptible, the white area shown in the color light blue or bright red. Alternatively, the illumination can of course also be done with unpolarized light, the viewer viewing the see-through window area 2 by means of a polarizer.
  • FIG. 7 shows the see-through window area 2 of the polymeric value document substrate 1 when illuminated with polarized light, wherein the polarization direction of the polarized light compared to the polarization direction of the in FIG. 6 rotated representation is shown. From the FIGS. 6 and 7 It can be seen that the observer perceives a different appearance depending on the rotation of the polarization direction of the polarized light.
  • FIG. 5 shows a novel polymeric value document substrate according to a second embodiment. Compared with that in the FIG. 4 In addition, as shown in FIG. 1, the additional ink-receiving layer 6 is coated so as to cover the underlying ink-receiving layer 4 and partially the liquid crystal material layer 7 doped with a dichroic dye. The additional ink-receiving layer 6 serves as a mask for masking registration variations between the ink-receiving layer 4 and the liquid-crystalline layer 7. In the production of the in FIG. 5 The polymeric value-document substrate shown is used in such a way that the polymeric carrier 3 is first provided with a dye-receiving layer 4 by means of a gravure printing process. In the region of the recess of the ink-accepting layer, the polymeric carrier 3 is provided with a UV varnish in a subsequent step. A relief structure is then impressed into the UV varnish, in order to obtain in this way a replication layer 5 provided with an embossed relief structure. Then, applying one with a dichroic dye doped liquid crystal material layer 7 by means of a screen printing method, the alignment of the doped with a dichroic dye liquid crystal layer 7 by means of embossed into the replication layer 5 relief structure and the crosslinking by UV radiation. Finally, the further ink-receiving layer 6 is coated so as to cover the underlying ink-receiving layer 4 and partially the liquid crystal material layer 7 doped with a dichroic dye.
  • FIG. 8 shows a novel polymeric value document substrate according to a third embodiment. Compared with those in the FIGS. 4 and 5 The polymeric value-document substrates shown in which two ink-receiving layers are present are disclosed in US Pat FIG. 8 only a paint receiving layer 4 before. For masking registration variations between the ink accepting layer 4 and the replication layer 5 provided with an embossed relief structure, a silver reflection layer 8 which can be obtained by printing is used. The reflection layer 8 is based on platelet-shaped metal pigments and is preferably produced in pattern form. In the production of in the FIG. 8 The polymeric value-document substrate shown is used in such a way that the polymeric carrier 3 is first provided with a dye-receiving layer 4 by means of a gravure printing process. In the region of the recess of the ink-accepting layer, the polymeric carrier 3 is provided with a UV varnish in a subsequent step. A relief structure is then impressed into the UV varnish, in order to obtain in this way a replication layer 5 provided with an embossed relief structure. Then, the printing of a composition based on platelet-shaped metal pigments is carried out to produce a silver reflection layer 8 in this way. The reflection layer 8 is formed so as to cover the ink accepting layer 4 located thereunder and partly the replication layer 5 provided with an impressed relief structure. Then, applying one with a dichroic dye doped liquid crystal material layer 7 by means of a screen printing method, the alignment of the doped with a dichroic dye liquid crystal layer 7 by means of embossed into the replication layer 5 relief structure and the crosslinking by UV radiation.
  • FIG. 9 shows a novel polymeric value document substrate according to a fourth embodiment. Compared with that in the FIG. 8 The polymeric value-document substrate shown, the silver reflective layer 8 is printed so that it covers the underlying ink-accepting layer 4 and partially the liquid crystal material layer 7 doped with a dichroic dye. The silver reflection layer 8 serves as a mask for masking registration variations between the ink accepting layer 4 and the liquid crystal layer 7. In the production of the in FIG. 9 The polymeric value-document substrate shown is used in such a way that the polymeric carrier 3 is first provided with a dye-receiving layer 4 by means of a gravure printing process. In the region of the recess of the ink-accepting layer 4, the polymeric carrier 3 is provided with a UV varnish in a subsequent step. A relief structure is then impressed into the UV varnish, in order to obtain in this way a replication layer 5 provided with an embossed relief structure. Then, applying a liquid crystal material layer 7 doped with a dichroic dye by means of a screen printing method, aligning the liquid crystal layer 7 doped with a dichroic dye by means of the relief structure embossed in the replication layer 5 and crosslinking by UV radiation. Finally, the silver reflective layer 8 based on platelet-shaped metal pigments is printed so as to cover the underlying ink-accepting layer 4 and partially the liquid crystal material layer 7 doped with a dichroic dye.
  • FIG. 10 1 illustrates a banknote 9 based on a paper substrate 10 with security elements according to the invention, namely a security patch 11 bonded to the paper substrate 10 by means of an adhesive layer and a security strip 12 adhered to the paper substrate 10 by means of an adhesive layer.
  • Both the security patch 11 and the security strip 12 may each have an analogous structure, as in one of FIGS. 4 . 5 . 8 or 9 is shown.

Claims (21)

  1. A polymeric value document substrate or security element comprising a polymeric support provided in a predetermined area in sequence with a replication layer and a liquid crystal material layer doped with at least one dichroic dye, wherein a surface of the replication layer facing the liquid crystal material layer faces a liquid crystal material layer doped with dichroic dye Embossed relief structure is embossed and the embossed relief structure has at least two areas with different orientation directions.
  2. A polymeric value document substrate or security element according to claim 1, wherein the relief structure impressed into the replication layer has at least two regions with orientation directions arranged orthogonally to one another.
  3. A polymeric value document substrate or security element according to claim 1, wherein the relief structure embossed into the replication layer has at least three regions with different orientation directions, the three orientation directions taking angles relative to each other, in particular from the group consisting of 0 °, 45 °, 90 ° and 135 ° are selected.
  4. A polymeric value document substrate or security element according to claim 1, wherein the relief structure impressed into the replication layer has at least four regions with different orientation directions, wherein the four orientation directions relative to each other in particular assume the angles 0 °, 45 °, 90 ° and 135 °.
  5. A polymeric value document substrate or security element according to any one of claims 1 to 4, wherein the relief structure embossed in the replication layer, having a plurality of regions of different orientation and embodying the dichroic dye-doped liquid crystal material layer, creates a hidden motif in the dichroic dye-doped liquid crystal material layer to the viewer when illuminated with polarized light visible to the naked eye.
  6. A polymeric value document substrate or security element according to any one of claims 1 to 4, wherein the relief structure embossed in the replication layer, having a plurality of regions of different orientation and doping the dichroic dye-doped liquid crystal material layer, produces at least two hidden motifs in the dichroic dye-doped liquid crystal material layer which is suitable for the Viewers are under illumination with polarized light visible to the naked eye by rotation of the polarization direction of the polarized light.
  7. A polymer value document substrate or security element according to any one of claims 1 to 6, wherein the liquid crystal material layer is doped with different dichroic dyes, wherein preferably differently oriented liquid crystal material layer regions comprise different dichroic dyes.
  8. A polymeric value document substrate or security element according to any one of claims 1 to 7, wherein the relief structure embossed in the replication layer, having at least two regions of different orientation directions and the liquid crystal material layer doped with dichroic dye, is a diffractive structure.
  9. A polymeric value document substrate or security element according to claim 8, wherein the diffractive structure comprises a first region for orientation of liquid crystal material covered by the liquid crystal material layer and a second region for producing a diffractive optical effect, in particular for producing a hologram.
  10. A polymer value document substrate or security element according to claim 8 or 9, wherein the diffractive structure has a region in which the diffractive structure is formed from a superposition of a coarse structure to produce an optical effect with a fine structure of higher spatial frequency for orientation of the liquid crystal material a period less than 400 nm is formed and the coarse structure is formed in particular with a period of 500 nm to 1 micrometer.
  11. A polymeric value document substrate or security element according to any one of claims 1 to 10, wherein the liquid crystal material layer doped with at least one dichroic dye covers the replication layer in regions in a pattern.
  12. A polymeric value document substrate or security element according to any one of claims 1 to 11, wherein the polymeric support has an opaque, printable and printable color layer outside the predetermined region provided with the replication layer and the liquid crystal material layer.
  13. A polymeric value document substrate or security element according to claim 12, wherein both the opaque, printable and printable color layer and the dichroic dye-doped liquid crystal material layer and / or the replication layer are partially filled with a pattern-shaped, commercially available, based on platelet-shaped metal pigments reflection layer are provided.
  14. The polymeric value document substrate or security element of any one of claims 1 to 13, wherein the polymeric carrier is a film, a film / paper / film composite substrate, or a paper / film / paper composite substrate.
  15. A polymeric value document substrate according to any one of claims 1 to 14, wherein the polymeric value document substrate is suitable for the production of value documents, in particular banknotes.
  16. Security element according to one of claims 1 to 14, wherein the security element is suitable for securing value documents, in particular banknotes, and is preferably a security thread, a security strip or a security patch.
  17. Security document, in particular a banknote, comprising the polymeric value document substrate or security element according to one of claims 1 to 16.
  18. A method of making a polymeric value document substrate or security element according to any one of claims 1 to 17, comprising:
    the provision of a polymeric carrier;
    optionally providing the polymeric support with a recessed, opaque, printable ink layer;
    - applying a replication layer to the polymeric support;
    - Providing the replication layer with an embossed relief structure, the at least two areas with different orientation directions and is suitable for aligning a liquid crystal material layer doped with at least one dichroic dye;
    - The application of a doped with at least one dichroic dye liquid crystal material layer on the embossed relief structure having replication layer.
  19. The method of making a polymeric value document substrate or security element of claim 18, wherein the step of providing the polymeric support with a recessed, opaque, printable ink layer is mandatory and the replication layer is applied to the polymeric support in the areas of the recesses of the ink layer.
  20. The method of claim 19, wherein the step of providing the polymeric support with a recessed, opaque, printable color layer in the form of a first color layer, the replication layer is applied in the areas of the recesses of the first color layer on the polymeric support having at least one Dichroic dye-doped liquid crystal material layer is applied to the embossed relief structure having replication layer and another opaque, printable color layer in the form of a second color layer is applied to the first color layer, that the second color layer also partially covers the liquid crystal material layer and / or the replication layer.
  21. The method of claim 19, wherein the step of providing the polymeric support is accomplished with a recessed, opaque, printable ink layer, the replication layer in the areas of the recesses of the color layer is applied to the polymeric substrate, the liquid crystal material layer doped with at least one dichroic dye to which the embossed relief structure having replication layer is applied and a platelet-shaped metal pigments based reflective layer is applied so that it covers both the opaque, printable ink layer and the liquid crystal material layer and / or the replication layer in part.
EP18000368.3A 2017-04-19 2018-04-16 Polymeric valuable document substrate, security element, valuable document and method of manufacturing Pending EP3392054A1 (en)

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