EP1744900B1 - Element de securite et son procede de production - Google Patents

Element de securite et son procede de production Download PDF

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Publication number
EP1744900B1
EP1744900B1 EP05739976.8A EP05739976A EP1744900B1 EP 1744900 B1 EP1744900 B1 EP 1744900B1 EP 05739976 A EP05739976 A EP 05739976A EP 1744900 B1 EP1744900 B1 EP 1744900B1
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EP
European Patent Office
Prior art keywords
layer
liquid crystal
transfer
alignment
effect
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP05739976.8A
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German (de)
English (en)
Other versions
EP1744900A2 (fr
Inventor
Winfried HOFFMÜLLER
Theodor Burchard
Thorsten Pillo
Manfred Heim
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Giesecke and Devrient Currency Technology GmbH
Original Assignee
Giesecke and Devrient GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=34966962&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP1744900(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority claimed from DE102004021246A external-priority patent/DE102004021246A1/de
Priority claimed from DE102004039355A external-priority patent/DE102004039355A1/de
Priority claimed from DE102004053007A external-priority patent/DE102004053007A1/de
Application filed by Giesecke and Devrient GmbH filed Critical Giesecke and Devrient GmbH
Priority to EP10014129.0A priority Critical patent/EP2287011B1/fr
Priority to EP09004830.7A priority patent/EP2123471B1/fr
Publication of EP1744900A2 publication Critical patent/EP1744900A2/fr
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Publication of EP1744900B1 publication Critical patent/EP1744900B1/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
    • B42D25/40—Manufacture
    • B42D25/45—Associating two or more layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
    • B42D25/29—Securities; Bank notes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/364—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
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/373—Metallic materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/40—Manufacture
    • B42D25/45—Associating two or more layers
    • B42D25/465—Associating two or more layers using chemicals or adhesives
    • B42D25/47—Associating two or more layers using chemicals or adhesives using adhesives
    • B42D2033/26—

Definitions

  • the invention relates to a method for producing a multilayer security element which has at least one effect layer which requires a special substrate.
  • Valuables such as branded goods or documents of value are often provided with security elements for the purpose of security, which allow verification of the authenticity of the object of value and at the same time serve as protection against unauthorized reproduction.
  • optically variable elements are used as security elements, which give the viewer a different image impression, for example a different color impression, at different viewing angles.
  • holograms holographic grating images and other hologram-like diffraction structures are used for authenticity assurance, which offer the viewer a viewing angle-dependent diffraction pattern.
  • Security elements with hologram-like diffraction structures are transferred, inter alia, in the transfer process to the target substrate, for example a banknote.
  • the detachment of the security element from the carrier film takes place either via so-called release layers, which are usually thermally activated, or by the low adhesion of the security element on the carrier film.
  • the security element is coated with a suitable adhesive system.
  • the publication WO 03/082598 A2 discloses an optically variable security element and a manufacturing method.
  • the publication EP 0 461475 A1 discloses a method of transferring a decor to a substrate.
  • the publication US 2003/0189684 A1 relates to a method for producing an anisotropic polymer layer on a substrate having a structured surface.
  • the object of the invention is to provide a method which avoids the disadvantages of the prior art.
  • the special substrate requiring effect layer of a first layer composite is prepared on a separate plastic carrier film and then transferred to a second layer composite, wherein the second layer composite also a plastic carrier film includes.
  • the plastic carrier film of the first layer composite is hereby specially adapted to the needs of the effect layer.
  • liquid-crystalline materials can be aligned in a simple manner and then transferred to any other layer sequence, which in itself has no corresponding properties.
  • the invention offers the advantage that the alignment layer does not have to be provided in the layer composite of the security element. Because the orientation of the liquid-crystalline material takes place on a separate carrier film and then only the liquid-crystalline material is transferred to the layer structure of the security element.
  • effect layers that require a special substrate.
  • Vapor deposited, optically variable layers such as, for example, diffraction structures, interference layer pigments, liquid crystal pigments or metallic effect pigments, for example, require a very smooth substrate in order to achieve a brilliant color impression or a reflecting surface.
  • the background layer in the desired layer sequence of the security element is not sufficiently smooth, as is the case, for example, with magnetic layers, then such layers can be prepared on an optimally prepared substrate of a plastic carrier film and then inserted at the desired location in the layer structure of the security element like on a rough magnetic layer.
  • an adhesive layer is used, which also compensates for the rough ground.
  • the security element can be provided with further functional layers, such as electrically conductive, luminescent, magnetic layers, or any imprints. Other layers produced by the process according to the invention can also be incorporated.
  • liquid-crystalline effect layers show, as explained in detail below, certain polarization or color effects.
  • the liquid-crystalline material is preferably applied directly to the plastic carrier film without further alignment layers, preferably printed. Preferably, the liquid crystalline material is partially applied.
  • the liquid-crystalline layers are advantageously applied as a lacquer layer of smectic, nematic or cholesteric liquid-crystalline material, preferably printed.
  • Gravure printing, screen printing, flexographic printing, knife or curtain coating are particularly suitable as printing techniques for the liquid-crystalline layers.
  • the second layer composite may comprise a reflective layer which is formed by a reflective thin-film element with a viewing angle-dependent color impression.
  • the thin-film element is preferably formed with a reflection layer, an absorber layer and a dielectric spacer layer arranged between the reflection layer and the absorber layer.
  • the reflection layer of the thin-film element is preferably formed from an opaque or semitransparent metal layer.
  • the thin-film element can also be formed with at least one absorber layer and at least one dielectric spacer layer, the absorber layers and the dielectric spacer layers being arranged alternately one above the other.
  • the thin-film element is formed with a plurality of dielectric spacer layers, wherein adjoining layers having greatly different refractive indices are formed.
  • the second layer composite comprises an optically active microstructure which is preferably formed as a diffractive diffraction structure, as a matt structure, as an arrangement of microlenses or as an arrangement of micromirrors.
  • the carrier film used in the process according to the invention is preferably provided as a smooth film with good surface quality.
  • a film specially designed for the alignment of liquid crystals can be provided.
  • plastic film as a carrier film.
  • plastic carrier films are Films made of PET, OPP, BOPP, PE or Celluloseacetat to name.
  • the carrier film may also itself comprise a plurality of sub-layers, for example, the carrier film may be provided with an alignment layer for the alignment of liquid crystals.
  • an alignment layer is in particular a layer of a linear photopolymer, a finely structured layer, ie a layer with orientation-promoting surface topography, or aligned by applying shear forces layer in question.
  • a suitable finely structured layer can be produced for example by embossing, etching or scoring.
  • the method according to the invention can be used to produce any desired security elements, in particular a security thread, a transferable security strip or a patch.
  • the finished security element is embedded, for example, in a security paper or valuable item, in particular value document, or applied to its surface.
  • the security element preferably contains a carrier substrate made of paper or plastic.
  • Valuables within the meaning of the present invention are in particular banknotes, stocks, bonds, certificates, vouchers, checks, high-quality admission tickets, but also other counterfeit-endangered papers, such as passports and other identification documents, as well as product security elements, such as labels, seals, packaging and the like.
  • the term “valuables” below includes all such items, documents and product means of protection.
  • security paper is understood to mean the precursor that can not yet be processed into a value document which, in addition to the security element, has further authenticity features, such as in volume provided luminescent substances may have. Security paper is usually in quasi-endless form and will be further processed at a later date.
  • FIG. 1 shows a schematic representation of a banknote 10 with two security elements 12 and 16, which are each made using a transfer material described below.
  • the first security element represents a security thread 12 that emerges at certain window areas 14 on the surface of the banknote 10, while it is embedded in the intervening areas inside the banknote 10.
  • the second security element is formed by a wide security strip 16 glued onto the banknote paper with a heat-seal adhesive.
  • Fig. 2 shows a plan view of a portion of the security strip 16, as it appears when viewed without aids or when viewed through a linear polarizer 20. Viewed without aids, the security strip 16 shows shiny metallic, optically variable diffraction structures 22, such as holograms or kinegrams. Such diffraction structures are known to the person skilled in the art and are therefore not explained further below. Instead of the diffraction structures 22, matt structures or refractive structures may also be provided, for example.
  • the structures can also be visualized with a circular polarizer.
  • Fig. 3 shows a cross-sectional view of an intermediate step in the production of a transfer material 30, for example, in a security thread 12 or a security strip 16 of the in Fig.1 shown type can be used.
  • a layer 34 of nematic liquid-crystalline material is partially printed on a transparent carrier film 32, for example a smooth plastic film of good surface quality, as an effect layer.
  • the Nematen für 34 is typically printed in the form of a motif of patterns, characters or a coding, for example in the form of in Fig. 2 shown honeycomb pattern.
  • a transfer auxiliary layer 36 is applied over the entire surface to the nematode layer 34 and the carrier film 32.
  • a UV-crosslinkable lacquer layer printed, whose adhesion to the support film 32 is less than the Nematen für 34.
  • a layer of cholesteric liquid-crystalline material or an embossing lacquer layer can be used.
  • an adhesive layer 38 is applied to the transfer auxiliary layer 36, with which the layer composite of carrier film 32, Nematen slaughter 34 and transfer assist layer 36 on a target substrate, such as a security paper, a document of value or another thread or strip structure 35, can be laminated.
  • a target substrate such as a security paper, a document of value or another thread or strip structure 35.
  • the carrier film 32 for the nemate layer 34 and the transfer assist layer 36 may be removed again by means of separation winding. The damage-free detachability of the carrier film 32 is ensured by the greater adhesion of the transfer assist layer 36 to the nemate layer 34.
  • both the transfer assist layer and the adhesive layer may include machine-readable feature substances, such as e.g. contain magnetic, electrically conductive, phosphorescent or fluorescent substances.
  • a further layer can be printed on the transfer auxiliary layer 36.
  • the further layer can be provided in particular with recesses or in the form of patterns, characters or codes. Under this layer another, eg machine-readable layer can be printed. It can also accommodate machine-readable security features in the further layer itself be.
  • the further manufacturing process then proceeds, as already related to Fig. 3 described.
  • the detachability of the carrier film 42 during transfer is ensured by a heat-sealable thermally activatable release layer 44.
  • the release-capable carrier film 42 is provided with an alignment-promoting alignment layer 48.
  • This can be, for example, a layer of a linear photopolymer, a layer with orientation-promoting surface topography or a layer oriented by the application of shear forces.
  • Fig. 5 shows an intermediate step of producing transfer material as in Fig. 3
  • the transfer material 50 of Fig. 5 has a carrier film 32 with an alignment layer 52, for example, a linear photopolymer, which serves to align the liquid crystals in the subsequently applied nematic and optionally cholesteric liquid crystal layers 34 and 36, respectively.
  • an alignment layer 52 for example, a linear photopolymer, which serves to align the liquid crystals in the subsequently applied nematic and optionally cholesteric liquid crystal layers 34 and 36, respectively.
  • a further layer 54 is printed on the transfer auxiliary layer 36.
  • the further layer 54 may be provided in particular with recesses or in the form of patterns, characters or codes.
  • the layer 54 may by an absorbent imprint or reflective metal layer.
  • the layer can be produced by printing the transfer assist layer 36 with a commercially available, in particular black printing ink. This is particularly appropriate when the transfer assist layer 36 consists of cholesteric liquid-crystalline material.
  • the transfer assist layer 36 is present as a UV-crosslinkable lacquer layer
  • the further layer can be provided by a metal layer into which recesses, for example in the form of a negative writing, can be introduced by partial demetallization.
  • another, eg machine-readable layer can be printed.
  • the layer 54 itself further, in particular machine-readable security features can be accommodated.
  • the further manufacturing process then proceeds, as already related to Fig. 3 described.
  • the transfer medium with negative writing 60 of Fig. 6 is printed on a carrier film 32, which in turn may be provided with an alignment layer, a nematic liquid crystal layer 34.
  • a UV-curable embossing lacquer layer 62 whose adhesion to the carrier foil 32 is less than that of the nematode layer 34, is printed over the carrier film 32 and the nematic layer 34 so that the embossing lacquer layer 62 fulfills the function of the transfer assist layer described above during the transfer of the transfer material 60 to a target substrate ,
  • a desired embossed structure 64 for example a diffraction structure, is impressed into the embossing lacquer layer 62 and a reflective layer 66, in particular a metal layer, is applied, into which partial demetallization recesses 68, in the embodiment in the form of negative writing, be introduced.
  • the embossing structure 64 may also be provided with a high refractive index layer. Examples of high-index materials are CaS, CrO 2 , ZnSi, TiO 2 or SiO x .
  • an adhesive layer 38 is applied to the composite layer for transfer to the target substrate.
  • the embossing pattern 64 can also be provided with a color shift effect thin film element, as described below with reference to FIG Fig. 8 is described in detail.
  • machine-readable and / or decorative layers can be applied to the partially demetallized embossing lacquer layer 62, in particular also in overlap with the metal layer 66.
  • a commercially available printing ink can be printed, which is then recognizable in the recesses or demetallized areas of the embossing lacquer layer when viewing the foil material applied to a substrate.
  • the ink, as well as the adhesive layer 38 may also contain machine-readable feature substances, such as e.g. contain magnetic, electrically conductive, phosphorescent or fluorescent substances.
  • Fig. 7 illustrates the fabrication of a multilayer security element 70 according to one embodiment of the invention. It will, as in Fig. 7 (a) as shown, a first layer composite 72 is formed from a first carrier foil 32, a nematic liquid crystal layer 34, and a transfer assist layer 36 of cholesteric liquid crystal material, as related With Fig. 3 described.
  • the transfer assist layer can be formed, for example, by a UV-crosslinkable lacquer layer or a layer of cholesteric, liquid-crystalline material.
  • a second layer composite 74 is produced by printing on a second carrier film 80 an embossing lacquer layer, embossing a desired embossed structure, in the exemplary embodiment a diffraction structure, into the embossing lacquer, onto the embossed layer 82 a metal layer 84 is vapor-deposited, and by partial demetallization of the Metal layer 84 recesses 86, for example, be generated in the form of negative writing.
  • the second layer composite 74 is applied via an adhesive layer 76 (FIG. Fig. 7 (c) ) laminated on the first layer composite 72, as by the FIGS. 7 (b) and 7 (a) connecting arrow 78 indicated.
  • the second carrier film 80 is removed by a separation winding and applied for the transfer of an adhesive layer 38 on the layer composite produced in this way, as in Fig. 7 (c) shown.
  • the carrier foil 32 can also be removed so that the entire layer composite is then present without carrier foils.
  • the polarization effect features are thus not affected by films in their effect and can be viewed with high contrast.
  • the reduced by the detachment of the second carrier film 80 protection function for the metallization can be compensated by protective lacquer layers.
  • Conventional protective lacquer layers are optically largely isotropic and therefore do not impair the recognizability of polarizing effects.
  • an additional, dark-colored layer may optionally be partially applied to the layer composite 74, in order to ensure good visibility of the color effect of the cholesteric liquid-crystal layer.
  • the embossing lacquer layer 82 can be darkened.
  • the second layer composite can also contain only one reflective layer, in particular a metal layer, which is preferably integrated into a print motif with large portions of demetallization.
  • the transfer material according to the invention then has an additional test level with the nematic layer 34, which can be authenticated with a polarizer.
  • the thin-film element 92 has a reflection layer 94, an absorber layer 98 and a dielectric spacer layer 96 arranged between the reflection layer and the absorber layer.
  • the color shift effect in such thin-film elements is based on viewing angle-dependent interference effects due to multiple reflections in the different sub-layers of the element.
  • the absorber layer 98 and / or the dielectric spacer layer 96 may have recesses in the form of patterns, characters or codes in which no color-shift effect can be recognized.
  • the reflection layer 94 may also have recesses in the form of patterns, characters or codes, which then form transparent or semitransparent regions in the thin-film element 92.
  • the thin-film element may have a layer sequence of absorber layer / dielectric layer / absorber layer or a sequence of several layers of alternating high-index and low-index dielectrics.
  • a layer sequence of reflection layer and an absorbing dielectric layer is also possible.
  • the second layer composite produced in this way is then laminated onto the first layer composite via an adhesive layer 76 and the second carrier film is removed by a separation winding.
  • an adhesive layer 38 is applied to the now exposed backside of the thin film element 92.
  • the first carrier film 32 can also be removed.
  • a multi-layer security element having a liquid crystal-based color-tilting or polarizing effect which is recognizable to the observer from the one side of the security element and a thin-film element having a color-shift effect recognizable from the second side is produced.
  • the security element is different from the one in Fig. 8 shown in that the transfer assist layer 36 of the first layer composite of cholesteric liquid-crystalline material is formed.
  • the adhesive layer 76 also forms a dark, preferably black background.
  • the adhesive layer 76 can be dyed or, if appropriate, subsequently blackened by the action of a laser beam.
  • the thin film element 92 of the second layer composite has an order reverse to the layer order described above, ie, the reflective layer is in the security element adjacent to the adhesive layer 76, and the absorber layer is adjacent to the adhesive layer 38.
  • Fig. 9 shows a transfer material 100, in which, as in Fig. 3 On a smooth plastic carrier sheet 32, a nematic liquid crystal layer 34 and a UV-crosslinkable transfer assist layer 36, for example, from cholesteric liquid crystal material, are printed. On the transfer assist layer 36 is further an embossing lacquer layer imprinted, a desired embossed structure, in the exemplary embodiment, a diffraction structure, embossed into the embossing lacquer layer, and a metal layer 104 is vapor-deposited on the embossed layer 102. Recesses 106 in the form of negative writing are introduced into the metal layer 104 by partial demetallization.
  • both the diffraction structure and the liquid-crystalline layers 34 and 36 can be perceived over the entire area on a dark background which is provided by an additional layer, for example a black imprint, or can also be present on the target substrate.
  • the embossing lacquer layer 102 on the transfer assist layer 36 is advantageously subjected to a corona treatment beforehand or it is provided with a suitable adhesion promoter.
  • An adhesive layer 38 is applied to the entire layer composite for transfer to the target substrate.
  • the carrier film 32 can be removed after the application of the transfer material 100 or left on the structure.
  • a multilayer security element 110 for example a security thread
  • a liquid crystal-based color shift effect for example a negative writing and a magnetic coding
  • a second layer composite 114 is produced by applying to a second carrier film 120 a screened aluminum layer 122 with recesses in the form of negative writing, and onto the aluminum layer a magnetic layer 124, in the exemplary embodiment in the form of a coding, is applied.
  • This second layer composite 114 is in Figure 10 (b) shown.
  • the aluminum layer 122 may also be provided as a full-surface layer with recesses, for example in the form of negative writing, to which in turn the magnetic layer 124 is applied.
  • the second layer composite 114 is then applied via an adhesive layer 116 (FIG. Fig. 10 (c) ) laminated on the first layer composite 112.
  • further layers 118 such as a white cover layer, which are required for the embedding of the security thread in a security paper, can be applied to the back side of the second carrier film 120.
  • an adhesive layer 38 for example a heat sealing lacquer, is applied for the transfer to the target substrate.
  • the carrier film 32 may be removed by means of parting, and further layers of the thread structure, such as a primer and a heat sealing lacquer, may be applied to the then exposed liquid crystal layers 34 and 36.
  • FIG Fig. 10 may instead of the applied in the form of a coding magnetic layer 124 of the second layer composite also a dark, in particular black layer with recesses and partially a magnetic layer, for example in the form of magnetic bits are used.
  • a dark, in particular black layer with recesses and partially a magnetic layer for example in the form of magnetic bits are used.
  • not all black areas need to be magnetic at the same time. In this way, a magnetic coding in the black layer can be optically hidden.
  • FIG. 11 Another variant of the example of Figure 10 , which differs only in the embodiment of the second composite layer, is in Fig. 11 shown.
  • the second layer composite 132 of the multilayer security element 130 of FIG Fig. 11 instead of the screened aluminum layer, a full-area, semitransparent metal layer 136 applied to a carrier film 134, on which a magnetic layer 138 is arranged, for example, in the form of a coding.
  • the further procedure in the production of the security thread 130 follows that described above in connection with FIG Figure 10 given description.
  • Fig. 12 illustrates the production of a multilayer security element 140, in particular a hologram security thread with magnetic coding and nematic printing according to a further embodiment of the invention.
  • a first layer composite 150 of a first plastic carrier film 152, a nematic liquid crystal layer 154, a transfer auxiliary layer 156 made of a modified UV-curing lacquer and a first adhesive layer 158 is prepared, as in Fig. 12 (a) shown.
  • a second layer composite 160 which is in Fig. 12 (b) an embossing lacquer layer is printed onto a second plastic carrier film 162, a desired diffraction structure is embossed into the embossing lacquer and an aluminum layer 166 is vapor-deposited on the embossed layer 164, in which, as already described in connection with FIG Fig. 7 described by partial demetallization recesses 168, for example, be generated in the form of negative writing.
  • a magnetic layer 170 in the form of a coding is applied to the rear side of the carrier foil 162 not coated with embossing lacquer. The magnetic bits of the magnetic coding are then covered with a cover layer 172.
  • a third layer composite 180 which functions as a cover element in the finished security thread, is produced by applying a full-area metal layer 184 to a third, particularly thin plastic carrier film 182 and providing the metal layer 184 with a further full-surface adhesive layer 186, as in FIG Fig. 12 (c) shown.
  • the first layer composite 150 with the nematic print is then laminated onto the top side of the hologram layer composite 160 (arrow 142) and the cover layer composite 180 is laminated via the adhesive layer 186 onto the underside of the hologram layer composite 160 carrying the magnetic code (arrow 144).
  • Additional layers 146 such as a white topcoat, required for embedding the security thread in a security paper can then be applied to the back side of the third carrier film 182.
  • an adhesive layer 38 such as a heat sealing lacquer, is applied as in Fig. 12 (d) shown.
  • the carrier foil 152 of the first Layer composite 150 can then be removed by means of parting and other layers of the thread structure, such as a primer and a heat sealing lacquer can be applied to the then exposed liquid crystal layers 154 and 156.
  • the security element 70 is placed on the target substrate 200 with the heat-sealable adhesive layer 38 and pressed in areas.
  • the pressing can be done for example with a not shown heated transfer punch or a transfer roller.
  • the adhesive layer 38 connects in the desired regions 202 with the target substrate 200, so that a transfer element, if appropriate with a predetermined outline shape, arises.
  • the carrier film 32 of the liquid crystal layers 34, 36 can be removed during the application process or shortly thereafter.
  • the surface of the target substrate 200 may be specially treated.
  • an adhesion promoter can be applied to the surface of the target substrate 200.
  • a multilayer security element 210 such as a security thread
  • a negative writing and a hidden magnetic coding is now based on the Fig. 14 explained.
  • a first layer composite 212 is formed from a first transparent carrier film 232, a region-wise applied, in particular printed, layer with flat metal pigments 234 and a transfer auxiliary layer 236, e.g. a UV-crosslinkable lacquer layer produced.
  • a transfer auxiliary layer 236, e.g. a UV-crosslinkable lacquer layer produced e.g. a UV-crosslinkable lacquer layer produced.
  • Printing inks with such flat metal pigments give a particularly good brilliance when printed directly on very smooth surfaces.
  • the transparent carrier film should therefore have a good surface quality.
  • a second layer composite 222 is produced by forming on a second carrier foil 246 an aluminum layer 242 with recesses in the form of a negative writing, and onto the aluminum layer a magnetic layer 244, in the form of a coding, is applied.
  • the second layer composite 222 is then laminated over an adhesive layer 238 onto the first layer composite 212 in register. Subsequently, further layers, not shown here, which are required for the embedding of the security thread in a security paper, can be applied to the back of the second carrier film 246. Finally, an adhesive layer 38, for example a heat sealing lacquer, is applied for the transfer to the target substrate.
  • the carrier sheet 232 may be removed by means of parting, and further layers of the yarn structure, such as a primer and a heat sealing lacquer may be applied to the then exposed layers 234 and 236, respectively.
  • the black magnetic regions are contained by the application of the high opaque, flat metal pigments Printing ink obscured.
  • the brilliance of the color would not be satisfactory and the visual appearance of the security element would be different on both sides.
  • the transfer material consists of an effect layer of optically variable pigments, such as interference layer pigments, which is applied over the entire surface to a transparent plastic carrier film.
  • optically variable pigments such as interference layer pigments
  • Such effect layers require a very smooth surface in order to achieve a brilliant color impression.
  • the transparent plastic carrier film it is also possible to use a lacquer layer applied to a transparent carrier film which has a suitable surface quality.
  • a transfer aid layer to the effect layer.
  • the detachability of the carrier film from the effect layer can also be ensured by a release layer assisting the separation under the appropriate transfer conditions.
  • the carrier film can then additionally comprise, for example, a release layer thermally activatable under heat-sealing conditions, as in the exemplary embodiment of US Pat Fig. 4 is illustrated on which then the effect layer is applied.
  • an adhesive layer is further applied to the effect layer.
  • the adhesive layer also be provided on the second layer composite. If desired or required, the carrier film can be removed by separation winding last.

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Claims (13)

  1. Procédé de fabrication d'un élément de sécurité multicouches, l'élément de sécurité comportant au moins une couche à effets qui nécessite un fond lisse, non poreux, caractérisé par les étapes suivantes :
    a) préparation d'un premier ensemble composite de couche, en particulier d'un matériau de transfert, par
    - préparation d'une première feuille de support en plastique, qui comporte une surface lisse, non poreuse,
    - application de la couche à effets, la couche à effets étant formée par une première couche d'un matériau à cristaux liquides de sorte que la première feuille de support en plastique et la couche à effets forment un premier ensemble composite de couche,
    b) préparation d'un deuxième ensemble composite de couche qui comprend une deuxième feuille de support en plastique et qui
    b1) comprend soit une couche réfléchissante qui est formée par un élément à couche mince réfléchissant avec effet d'impression en couleur en fonction de l'angle d'observation,
    b2) soit comprend une microstructure optiquement efficace,
    c) assemblage du premier et deuxième ensemble composites de couche de manière que la couche à effets vient se placer sur le deuxième ensemble composite de couche,
    d) enlèvement de la première feuille de support en plastique.
  2. Procédé selon la revendication 1, caractérisé en ce que la couche à effets forme une couche à effets optiquement efficace ou une couche à effets agissant de manière réfléchissante.
  3. Procédé selon au moins l'une quelconque des revendications 1 à 2, caractérisé en ce que la couche à effets est appliquée partiellement sur la feuille de support.
  4. Procédé selon au moins l'une quelconque des revendications 1 à 3, caractérisé en ce qu'au moins une autre couche à cristaux liquides est partiellement appliquée entre la première couche à cristaux liquides partiellement appliquée et la couche auxiliaire de transfert.
  5. Procédé selon au moins l'une quelconque des revendications 1 à 4, caractérisé en ce que la première et/ou les autres couches à cristaux liquides sont appliquées sous la forme de motifs, de signes ou de codages.
  6. Procédé selon au moins l'une quelconque des revendications 1 à 5, caractérisé en ce que la première couche à cristaux liquides et/ou les autres couches à cristaux liquides sont appliquées, de préférence surimprimées, en tant que couche de vernis d'un matériau à cristaux liquides nématique, cholestérique ou smectique.
  7. Procédé selon la revendication 6, caractérisé en ce que la première couche à cristaux liquides et/ou les autres couches à cristaux liquides et/ou la couche auxiliaire de transfert sont surimprimées au moyen d'héliogravure, de sérigraphie, de flexographie, de l'enduction à la racle sur rouleau ou de l'enduction au rideau.
  8. Procédé selon au moins l'une quelconque des revendications 1 à 7, caractérisé en ce que dans le cas b1), l'élément à couche mince est formé avec une couche réfléchissante, une couche d'absorbeur et une couche d'espacement diélectrique disposée entre la couche réfléchissante et la couche d'absorbeur.
  9. Procédé selon au moins l'une quelconque des revendications 1 à 7, caractérisé en ce que dans le cas b2) la microstructure optiquement efficace est formée comme structure de diffraction diffractive, comme structure mate, comme agencement de microlentilles ou comme agencement de micromiroirs.
  10. Procédé selon au moins l'une quelconque des revendications 1 à 9, caractérisé en ce qu'une feuille conçue pour l'orientation des cristaux liquides est préparée en tant que feuille de support.
  11. Procédé selon au moins l'une quelconque des revendications 1 à 10, caractérisé en ce qu'une feuille dotée d'une couche d'alignement pour l'orientation des cristaux liquides est préparée en tant que feuille de support.
  12. Procédé selon la revendication 11, caractérisé en ce qu'une couche faite d'un photopolymère linéaire, une couche avec une topographie superficielle favorisant l'orientation ou une couche orientée par l'action des forces de cisaillement, est utilisée en tant que couche d'alignement.
  13. Procédé selon la revendication 12, caractérisé en ce que la couche avec une topographie superficielle favorisant l'orientation est fabriquée par gaufrage, gravure caustique ou rayure.
EP05739976.8A 2004-04-30 2005-04-29 Element de securite et son procede de production Active EP1744900B1 (fr)

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EP09004830.7A EP2123471B1 (fr) 2004-04-30 2005-04-29 Elément de sécurité et son procédé de fabrication

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DE102004021246A DE102004021246A1 (de) 2004-04-30 2004-04-30 Sicherheitselement und Verfahren zu seiner Herstellung
DE102004039355A DE102004039355A1 (de) 2004-08-12 2004-08-12 Sicherheitselement und Verfahren zu seiner Herstellung
DE102004053007A DE102004053007A1 (de) 2004-10-29 2004-10-29 Sicherheitselement und Verfahren zu seiner Herstellung
PCT/EP2005/004667 WO2005108108A2 (fr) 2004-04-30 2005-04-29 Element de securite et son procede de production

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EP10014129.0A Division EP2287011B1 (fr) 2004-04-30 2005-04-29 Elément de sécurité et son procédé de fabrication
EP10014129.0A Division-Into EP2287011B1 (fr) 2004-04-30 2005-04-29 Elément de sécurité et son procédé de fabrication

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EP2123471B1 (fr) 2015-07-08
US20070211238A1 (en) 2007-09-13
WO2005108108A3 (fr) 2006-04-06
EP2287011A3 (fr) 2016-04-13
EP1744900A2 (fr) 2007-01-24
EP2287011B1 (fr) 2017-06-28
WO2005108108A8 (fr) 2006-01-05
EP2123471A1 (fr) 2009-11-25
WO2005108108A2 (fr) 2005-11-17
EP2287011A2 (fr) 2011-02-23

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