EP1744900A2 - Element de securite et son procede de production - Google Patents

Element de securite et son procede de production

Info

Publication number
EP1744900A2
EP1744900A2 EP05739976A EP05739976A EP1744900A2 EP 1744900 A2 EP1744900 A2 EP 1744900A2 EP 05739976 A EP05739976 A EP 05739976A EP 05739976 A EP05739976 A EP 05739976A EP 1744900 A2 EP1744900 A2 EP 1744900A2
Authority
EP
European Patent Office
Prior art keywords
layer
transfer
carrier film
effect
liquid
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP05739976A
Other languages
German (de)
English (en)
Other versions
EP1744900B1 (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.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=34966962&utm_source=***_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP1744900(A2) "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
Application granted granted Critical
Publication of EP1744900B1 publication Critical patent/EP1744900B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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 articles or documents of value are often equipped with security elements for security purposes, which allow the authenticity of the object of value to be checked and which 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, from different viewing angles.
  • holograms, holographic grating images and other hologram-like diffraction structures are often used, which offer the viewer a diffraction image that is dependent on the viewing angle.
  • Security elements with hologram-like diffraction structures are transferred to the target substrate, for example a bank note, using the transfer method, among other things.
  • the security element is detached from the carrier film either via so-called release layers, which can usually be activated thermally, or through the low adhesion of the security element to the carrier film.
  • the security element is also coated with a suitable adhesive system.
  • Other security features, such as gloss pigments or other optically variable effect colors, are mostly used printed directly on a paper substrate. The brilliance and the visual impression of the respective security element depend heavily on the surface.
  • the object of the invention is to specify a method which avoids the disadvantages of the prior art.
  • the effect layer of a first layer composite that requires a special substrate is therefore prepared on a separate plastic carrier film and then transferred to a second layer composite, the second layer composite also comprising a plastic carrier film.
  • the plastic carrier film of the first layer composite is specifically adapted to the needs of the effect layer.
  • certain plastic films have the property that they align liquid-crystalline material.
  • liquid-crystalline materials can be aligned in a simple manner and then transferred to any other layer sequence which does not have any 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. This is because the alignment 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.
  • Evaporated, optically variable layers e.g. Diffraction structures, interference layer pigments, liquid crystal pigments or metallic effect pigments, for example, require a very smooth background in order to achieve a brilliant color impression or a reflective surface.
  • the background layer in the desired layer sequence of the security element is not sufficiently smooth, e.g.
  • magnetic layers such layers can be prepared on an optimally prepared base of a plastic carrier film and then inserted at a desired location in the layer structure of the security element, e.g. on a rough magnetic layer.
  • An adhesive layer is preferably used for the transfer, which also compensates for the rough surface.
  • the security element can be provided with further functional layers, such as electrically conductive, luminescent, magnetic layers, or any desired imprints. Further layers produced by the method according to the invention can also be inserted.
  • the invention also includes a method for producing a first layer composite, in particular a transfer material for transfer to a target substrate, which comprises the following method steps:
  • a transfer material for transfer to a target substrate can also be carried out by the following process steps:
  • the releasability of the carrier film is ensured by a release layer which supports the separation of the carrier film from the effect layer and the transfer auxiliary layer under the corresponding transfer conditions.
  • a release layer which can be thermally activated under heat sealing conditions is advantageously used.
  • the effect layer advantageously forms an optically effective effect layer or a reflective effect layer.
  • effect layer in both process variants is preferably applied partially, in particular in the form of patterns, characters or codes.
  • liquid-crystalline effect layers representative of any other effect layers.
  • Such liquid-crystalline effect layers show certain polarization or color effects.
  • the liquid-crystalline material is preferably applied directly to the plastic carrier film without further alignment layers, preferably on printed.
  • the liquid-crystalline material is preferably applied partially.
  • a transfer auxiliary layer By using a transfer auxiliary layer according to the invention, security elements that are not present over the entire surface, for example printed as a motif, made of liquid-crystalline material can also be transferred to a target substrate. If desired or necessary, the carrier film for the liquid-crystalline layer and the transfer auxiliary layer can be removed during or after the application of the transfer material to the target substrate. The damage-free detachability of the carrier film is ensured by the greater adhesion of the transfer auxiliary layer to the liquid crystalline layer.
  • layer composites which require mutually exclusive production conditions or mutually interfering carrier foils can also be combined according to the invention, since the carrier foils can be removed during or after the partial layer composites have been joined together.
  • liquid-crystalline material can be applied partially, in particular in the form of patterns, characters or codes, between the liquid-crystalline layer and the auxiliary transfer layer. This can be an advantage at least partially overlap with the liquid crystal layer applied first.
  • the liquid-crystalline layers are advantageously applied, preferably printed, as a lacquer layer made of smectic, nematic or cholesteric liquid-crystalline material.
  • a lacquer layer made of smectic, nematic or cholesteric liquid-crystalline material.
  • gravure printing, screen printing, flexographic printing, knife or curtain coating are particularly suitable.
  • a UV-curing lacquer layer is preferably applied, in particular printed, as the auxiliary transfer layer.
  • the UV-curing lacquer layer expediently contains photoinitiators. In individual cases, a balance must be sought between a sufficiently high adhesion of the transfer auxiliary layer to the liquid-crystalline layer to be removed and a sufficiently low adhesion to the carrier film.
  • a layer of cholesteric liquid-crystalline material is applied, in particular printed, as a transfer auxiliary layer.
  • An embossing lacquer layer can also advantageously be used as an auxiliary transfer layer.
  • the embossing lacquer layer is expediently printed and subsequently embossed, provided with a reflective layer, in particular metallized and possibly demetallized in some areas, in order, for example, to insert negative writing into the metallized embossed structure.
  • the embossed structure advantageously forms an optically effective microstructure, in particular a diffractive beu structure, a matt structure, an arrangement of microlenses or an arrangement of micromirrors.
  • the transfer auxiliary layer can advantageously be subjected to a corona treatment or can be equipped with an adhesion promoter.
  • one or more further layers can be applied to the transfer auxiliary layer, in particular printed on, in order to produce more complex layer structures.
  • a further layer can, for example, be printed on the transfer auxiliary layer using a printing ink, preferably a magnetic ink.
  • An embossing lacquer layer can also be applied, in particular printed, as a further layer. After application, the embossing lacquer layer is advantageously embossed, metallized and, if necessary, demetallized in some areas.
  • a reflective layer can also be applied as a further layer.
  • this can also be formed by a reflective thin-film element.
  • a reflective 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 layer composites already described are connected to one or more further layer composites, for example via laminating lacquer layers.
  • a second layer composite present on a second carrier film can be provided according to the invention, which is connected to the layer composite of carrier film, effect layer and transfer auxiliary layer via a second adhesive layer in step d) before the adhesive layer is applied.
  • the second layer composite is produced by applying an embossing lacquer layer to the second carrier film, embossing, metallizing and, if appropriate, demetallizing the embossing lacquer layer in certain areas.
  • the second layer composite is produced by applying a screened metal layer with cutouts or a semi-transparent metal layer to the second carrier film and by producing a magnetic layer on the metal layer, in particular in the form of patterns, characters or codes.
  • the second layer composite can also comprise a reflective layer.
  • the reflective layer can advantageously be formed by a metal layer or, in the case of more complex structures, by a reflective thin-layer element with a color impression depending on the viewing angle.
  • 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 semi-transparent 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, layers adjacent to one another being formed with greatly different refractive indices.
  • the second layer composite comprises an optically effective 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.
  • a smooth film with good surface quality is preferably provided as the carrier film in the methods according to the invention.
  • a film specially designed for the alignment of liquid crystals can be provided.
  • a plastic film can advantageously be used as the carrier film.
  • plastic carrier films include films made of PET, OPP, BOPP, PE or cellulose acetate.
  • the carrier film itself can also comprise several partial layers, for example the carrier film can be provided with an alignment layer for the alignment of liquid crystals.
  • a layer made of a linear photopolymer, a finely structured layer, ie a layer with an orientation-promoting surface topography, or a layer aligned by exerting shear forces can be used as an alignment layer.
  • a suitable, finely structured layer can be produced, for example, by embossing, etching or scratching.
  • the invention also includes a transfer material for transfer to a target substrate, which can be produced in particular by one of the production methods described above, and which contains a sequence of layers with an effect layer, a full-surface transfer auxiliary layer which is arranged directly above the first layer, and one Adhesive layer for transferring the layer sequence to the target substrate.
  • the effect layer is advantageously applied partially to the carrier film.
  • the effect layer is formed by a first layer made of a liquid-crystalline, in particular a nematic, liquid-crystalline material.
  • the transfer auxiliary layer preferably consists of a UV-curing lacquer layer, of a cholesteric liquid-crystalline material or of an embossed lacquer layer provided with an embossing.
  • the at least one further layer of liquid-crystalline material between the (partially present) effect layer and the full-surface transfer auxiliary layer.
  • the at least one further liquid-crystalline layer is preferably formed from cholesteric liquid-crystalline material.
  • the effect layer and the transfer auxiliary layer are present on a plastic carrier film, the adhesion of the full-area transfer auxiliary layer to the carrier film being less than to the (partially present) effect layer.
  • the effect layer and the transfer auxiliary layer can also be present on a plastic carrier film, which has a release layer, in particular a thermally activatable release layer.
  • the invention also includes a security element for securing valuable objects, which can be produced in particular by one of the methods described above or with a transfer material of the type described.
  • the invention also encompasses a method for transferring a transfer element to a target substrate, in which a transfer material of the type described is placed with the adhesive layer on the target substrate and is connected to the target substrate by the action of heat and / or pressure.
  • a transfer material of the type described is placed with the adhesive layer on the target substrate and is connected to the target substrate by the action of heat and / or pressure.
  • the transfer material is expediently connected to the target substrate by the action of pressure and radiation.
  • the plastic carrier film of the optionally partially present effect layer is expediently removed during or shortly after application to the target substrate.
  • the method according to the invention can be used to produce any 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 object, in particular a value document, or applied to its surface.
  • the security element preferably contains a carrier substrate made of paper or plastic.
  • a transfer material of the type described is applied to an object to be secured, in particular glued on by the action of heat and / or pressure and / or the action of radiation.
  • the surface of the security paper or valuable object can be specially treated to improve the adhesive effect of the security element on the surface and its optical efficiency.
  • an adhesion promoter can be used for this purpose, which is applied to the surface of the security paper.
  • Valuable objects in the sense of the present invention are, in particular, banknotes, shares, bonds, certificates, vouchers, checks, high-quality admission tickets, but also other papers which are susceptible to forgery, such as passports and other identification documents, and also product security elements such as labels, seals, packaging and the like.
  • the term “valuable object” includes all such objects, documents and product security means.
  • security paper is understood to mean the preliminary stage to a value document which is not yet fit for circulation and which, in addition to the security element, has other authenticity features, such as e.g. can have luminescent substances provided in the volume. Security paper is usually in an almost endless form and will be processed at a later date.
  • FIG. 1 shows a schematic representation of a banknote with an embedded security thread and a glued-on security strip, in each case according to one exemplary embodiment of the invention
  • FIG. 2 shows a top view of a partial area of the security strip of FIG. 1 as it appears when viewed without aids or when viewed through a polarizer
  • FIG. 3 shows a cross-sectional illustration of an intermediate step in the production of a transfer material according to the invention
  • FIG. 7 shows the production of a multi-layer security element according to a further exemplary embodiment of the invention, with (a) and (b) showing a first and second layer composite before lamination and (c) the finished security element,
  • FIG. 8 is an illustration of a multi-layer security element according to a further embodiment of the invention
  • 9 shows a representation as in FIG. 3 according to a further exemplary embodiment of the invention
  • FIG. 10 shows the production of a multilayer security element according to a further exemplary embodiment of the invention, with (a) and (b) showing a first and second layer composite before lamination and (c) the finished security element,
  • FIG. 11 shows a variant of the embodiment of FIG. 10 (c), which differs from it only in the configuration of the second layer composite
  • FIG. 12 shows the production of a multilayer security element according to a further exemplary embodiment of the invention, in which (a), (b) and (c) show a first, second and third layer composite before lamination and (d) the finished security element,
  • FIG. 13 shows the transfer of the multilayer security element of FIG. 7 onto a target substrate
  • FIG. 14 is an illustration of a multilayer security element according to a further exemplary embodiment of the invention.
  • FIG. 1 shows a schematic illustration of a bank note 10 with two security Unit elements 12 and 16, which are each produced with the aid of a transfer material according to the invention.
  • the first security element represents a security thread 12 which emerges from certain window areas 14 on the surface of the bank note 10, while it is embedded in the areas in between inside the bank note 10.
  • the second security element is formed by a wide security strip 16 glued to the banknote paper with a heat seal adhesive.
  • FIG. 2 shows a top view of a partial area of the security strip 16 as it appears when viewed without aids or when viewed through a linear polarizer 20.
  • the security strip 16 When viewed without aids, the security strip 16 shows shiny metallic, optically variable diffraction structures 22, such as holograms or kinegrams.
  • Diffraction structures are known to the person skilled in the art and are therefore not explained further below. Instead of the diffraction structures 22, e.g. Matt structures or refractive structures can be provided.
  • security strip 16 is viewed through a linear polarizer 20
  • additional structures in the exemplary embodiment a honeycomb pattern 24, appear. These structures, which are practically invisible to the naked eye, can be used to check the authenticity of the banknote 10. Alternatively, the structures can also be made visible with a circular polarizer.
  • the construction and manufacture of security elements according to the invention is first explained using simpler and then increasingly complex security element structures.
  • FIG. 3 shows a cross-sectional illustration of an intermediate step in the production of a transfer material 30, which can be used for example with a security thread 12 or a security strip 16 of the type shown in FIG. 1.
  • 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 nematic layer 34 is typically printed in the form of a motif of patterns, characters or a code, for example in the form of the honeycomb pattern shown in FIG. 2.
  • a transfer auxiliary layer 36 is applied to the entire area of the nematic layer 34 and the carrier film 32.
  • a UV-crosslinkable lacquer layer is printed on, the adhesion of which to the carrier film 32 is lower than to the nematic layer 34.
  • Auxiliary layer 36 can also be a layer of cholesteric liquid crystalline material or an embossing lacquer layer.
  • An adhesive layer 38 is then applied to the transfer auxiliary layer 36, with which the layer composite comprising the carrier film 32, the nematic layer 34 and the transfer auxiliary layer 36 can be laminated onto a target substrate, such as a security paper, a value document or also another thread or strip structure 35 , If desired or necessary, the carrier film 32 for the nematic layer 34 and the transfer auxiliary layer 36 can finally be removed again by separating winding. The damage-free detachability of the carrier film 32 is ensured by the greater adhesion of the transfer auxiliary layer 36 to the nematic layer 34.
  • both the transfer auxiliary layer and the adhesive layer can contain machine-readable feature substances, such as contain magnetic, electrically conductive, phosphorescent or fluorescent substances.
  • a further layer can be printed onto the transfer auxiliary layer 36.
  • the further layer can in particular be provided with cutouts or in the form of patterns, characters or codes.
  • a further, for example machine-readable, layer can be printed under this layer. Machine-readable security features can also be accommodated in the further layer.
  • the further manufacturing process then proceeds as already described in connection with FIG. 3.
  • the transfer material 40 of the exemplary embodiment shown in FIG. 4 the releasability of the carrier film 42 is ensured during the transfer by means of a release layer 44 which can be thermally activated under heat sealing conditions.
  • the release-capable carrier film 42 is provided with an alignment-promoting alignment layer 48.
  • This can be, for example, a layer made of a linear photopolymer, a layer with a surface topography that promotes alignment, or a layer that is aligned by exerting shear forces.
  • FIG. 5 shows an intermediate step in the production of transfer material as in FIG. 3 according to a further exemplary embodiment of the invention.
  • the transfer material 50 of FIG. 5 has a carrier film 32 with an alignment layer 52, for example made of a linear photopolymer, which serves to align the liquid crystals in the subsequently applied nematic and optionally cholesteric liquid crystal layers 34 and 36.
  • a further layer 54 is printed on the transfer auxiliary layer 36.
  • the further layer 54 can in particular be provided with cutouts or in the form of patterns, characters or codes.
  • the layer 54 can be provided by an absorbent print or a reflective metal layer.
  • the layer can be printed on the trans- auxiliary layer 36 can be produced with a commercially available, in particular black, printing ink. This is particularly useful when the transfer auxiliary layer 36 consists of cholesteric liquid-crystalline material.
  • the further layer can be provided by a metal layer into which cutouts, for example in the form of a negative writing, can be made by partial demetallization.
  • a further, for example machine-readable, layer can be printed under layer 54. Additional, in particular machine-readable, security features can also be accommodated in layer 54 itself. The further manufacturing process then proceeds as already described in connection with FIG. 3.
  • a nematic liquid crystal layer 34 is printed on a carrier film 32, which in turn can be provided with an alignment layer.
  • a UV-curable embossing lacquer layer 62 is printed over the entire surface of the carrier film 32 and the nematic layer 34, and its adhesion to the carrier film 32 is less than that to the nematic layer 34, so that the embossing lacquer layer 62 fulfills the function of the transfer auxiliary layer described above when the transfer material 60 is transferred to a target substrate ,
  • a desired embossing structure 64 for example a diffraction structure, is then embossed into the embossing lacquer layer 62 and a reflective layer 66, in particular a metal layer, is applied, into which cutouts 68, in the exemplary embodiment in the form of a negative writing, are introduced by partial demetallization.
  • the embossed structure 64 can also be provided with a high refractive index layer. Examples of high refractive index Materials are CaS, CrOi, ZnSi, ⁇ O2 or SiOx.
  • an adhesive layer 38 is applied to the layer composite for the transfer to the target substrate.
  • the embossed structure 64 can also be provided with a thin-layer element with a color-shift effect, as is described in detail below with reference to FIG. 8.
  • the adhesive layer 38 Before the adhesive layer 38 is applied, further, in particular machine-readable and / or decorative, layers can be applied to the partially demetalized embossing lacquer layer 62, in particular also in an overlap with the metal layer 66.
  • a commercially available printing ink can be printed on, which is then recognizable in the cutouts or demetallized areas of the embossing lacquer layer when the film material applied to a substrate is viewed.
  • the printing ink like the adhesive layer 38, can also include machine-readable feature substances, such as contain magnetic, electrically conductive, phosphorescent or fluorescent substances.
  • FIG. 7 illustrates the production of a multilayer security element 70 according to a further exemplary embodiment of the invention.
  • a first layer composite 72 is produced from a first carrier film 32, a nematic liquid crystal layer 34 and a transfer aid layer 36 made of cholesteric liquid crystal material, as described in connection with FIG. 3.
  • the transfer auxiliary layer can, for example, by a UV-crosslinkable lacquer layer or a layer made of cholesteric, liquid-crystalline material.
  • a second layer composite 74 is produced by printing an embossing lacquer layer on a second carrier film 80, a desired embossing structure, in the exemplary embodiment a diffraction structure, is embossed into the embossing lacquer onto the embossed one Layer 82, a metal layer 84 is evaporated, and cutouts 86, for example in the form of a negative writing, are produced by partial demetallization of the metal layer 84.
  • the second layer composite 74 is laminated onto the first layer composite 72 via an adhesive layer 76 (FIG. 7 (c)), as indicated by the arrow 78 connecting FIGS. 7 (b) and 7 (a). Subsequently, the second carrier film 80 is removed by a separation winding and an adhesive layer 38 is applied to the layer composite thus produced, as shown in FIG. 7 (c). After the security element 70 has been applied to the target substrate, the carrier film 32 can also be removed, so that the entire layer composite is then present without carrier films. The characteristics working with polarization effects are not affected by foils and can be viewed with high contrast.
  • the protective function for the metallization which is reduced due to the detachment of the second carrier film 80, can be compensated for by protective lacquer layers.
  • Conventional protective lacquer layers are largely isotropic optically and therefore do not impair the recognizable polarizing effect. If a layer of cholesteric liquid-crystalline material is used as the transfer auxiliary layer 36, an additional, dark-colored layer can optionally be partially applied to the layer composite 74 in order to ensure that the color effect of the cholesteric liquid-crystal layer can be easily recognized.
  • the embossing lacquer layer 82 can also be colored dark.
  • 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 proportions 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.
  • FIG. 8 shows an exemplary embodiment, the production of which is analogous to the production process described in FIG. 7.
  • a first layer composite is produced from a first carrier film 32, a nematic liquid crystal layer 34 and a transfer auxiliary layer 36, for example a UV-crosslinkable lacquer layer, and a second layer composite from a second carrier film, onto which a thin layer element is applied 92 is applied with a color shift effect.
  • 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 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 can have cutouts in the form of patterns, characters or codes in which no color shift effect can be seen.
  • the reflection layer 94 can also have cutouts in the form of patterns, characters or codes, which then form transparent or semi-transparent regions in the thin-film element 92.
  • the thin-film element can 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 consisting of a reflection layer and an absorbing dielectric layer can also be considered.
  • 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 separating winding.
  • an adhesive layer 38 is applied to the now exposed back of the thin-film element 92.
  • further machine-readable and / or decorative layers for example with a magnetic paint, can be placed on the exposed rear side of the thin-film element 92. be applied.
  • the first carrier film 32 can also be detached.
  • a multi-layer security element with a liquid crystal-based color shift or polarization effect which can be seen by the viewer from one side of the security element, and a thin-film element with a color shift effect, which can be recognized from the second side is generated.
  • the security element differs from that shown in FIG. 8 in that the transfer auxiliary layer 36 of the first layer composite is formed from cholesteric liquid-crystalline material.
  • the adhesive layer 76 also forms a dark, preferably black, background.
  • the adhesive layer 76 can be colored or, if necessary, subsequently blackened by the action of a laser beam.
  • the thin-layer element 92 of the second layer composite has an order which is the reverse of the layer order described above, i.e. the reflection layer is adjacent to the adhesive layer 76 in the security element, and the absorber layer is adjacent to the adhesive layer 38.
  • FIG. 9 shows a transfer material 100 according to a further exemplary embodiment of the invention, in which, as in FIG. 3, a nematic liquid crystal layer 34 and a UV-crosslinkable layer are placed on a smooth plastic carrier film 32
  • Transfer auxiliary layer 36 for example made of cholesteric liquid crystal material, can be printed on.
  • An embossing lacquer is further applied to the transfer auxiliary layer 36.
  • layer, a desired embossed structure in the exemplary embodiment a diffraction structure, is embossed into the embossed lacquer layer, and a metal layer 104 is evaporated onto the embossed layer 102.
  • Recesses 106 in the form of a negative writing are made in the metal layer 104 by partial demetallization.
  • the embossing lacquer layer 102 is advantageously subjected to a corona treatment beforehand, or it is equipped with a suitable adhesion promoter.
  • An adhesive layer 38 is also applied to the entire layer composite for the transfer to the target substrate.
  • the carrier film 32 can be removed after the transfer material 100 has been applied or can be left on the structure.
  • a multi-layer security element HO for example a security thread
  • a liquid crystal-based color shift effect for example a negative writing and a magnetic coding
  • FIG. 10 (a) a first layer composite 112 is produced from a first carrier film 32, a nematic liquid crystal layer 34 and a transfer auxiliary layer 36, for example from cholesteric liquid crystal material, as described in FIG. 3.
  • a second layer composite 114 is produced by applying a screened aluminum layer 122 with cutouts in the form of negative writing to a second carrier film 120 and applying a magnetic layer 124, in the exemplary embodiment in the form of a coding, to the aluminum layer.
  • This second layer composite 114 is shown in FIG. 10 (b).
  • the aluminum layer 122 can also be provided as a full-surface layer with cutouts, for example in the form of a negative writing, to which the magnetic layer 124 is in turn applied.
  • the second layer composite 114 is then laminated onto the first layer composite 112 via an adhesive layer 116 (FIG. 10 (c)).
  • further layers 118 such as a white cover layer, which are required for embedding the security thread in a security paper, can be applied to the back of the second carrier film 120.
  • an adhesive layer 38 for example a heat seal lacquer, is applied for the transfer to the target substrate.
  • the carrier film 32 can be removed by separation winding and further layers of the thread structure, such as an adhesion promoter and a heat seal lacquer, can be applied to the then exposed liquid crystal layers 34 and 36.
  • the second layer composite instead of the magnetic layer 124 applied in the form of a coding, the second layer composite, a dark, in particular black, layer with recesses and in some areas a magnetic layer, for example in the form of magnetic bits, can be used. In particular, not all black areas need to be magnetic at the same time. In this way, magnetic coding can be optically hidden in the black layer.
  • FIG. 11 A further variant of the exemplary embodiment from FIG. 10, which differs only in the configuration of the second layer composite, is shown in FIG. 11.
  • the second layer composite 132 of the multilayer security element 130 of FIG. 11 contains, instead of the rasterized aluminum layer, a full-surface, semi-transparent 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 for the production of the security thread 130 follows the description given above in connection with FIG. 10.
  • 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 exemplary embodiment of the invention.
  • a first layer composite 150 is produced from a first plastic carrier film 152, a nematic liquid crystal layer 154, an auxiliary transfer layer 156 from a modified UV-curing lacquer and a first adhesive layer 158, as shown in FIG. 12 (a).
  • a second layer composite 160 which is shown in FIG. 12 (b)
  • an embossing lacquer layer is printed on a second plastic carrier film 162
  • a desired diffraction structure is embossed in the embossing lacquer
  • an aluminum layer 166 is evaporated onto the embossed layer 164, in which, as already described in connection with FIG. 7, cutouts 168, for example in the form of a negative writing, are produced by partial demetalization.
  • a magnetic layer 170 in the form of a coding is applied to the back of the carrier film 162 which is 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 covering element in the finished security thread, is produced by applying a full-surface 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. 12 (c) shown.
  • the first layer composite 150 is laminated with the nematic printing with the aid of the adhesive layer 158 onto the top 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) .
  • Further layers 146 such as a white cover layer, which are required for embedding the security thread in a security paper, can then be applied to the back of the third carrier film 182.
  • an adhesive layer 38 for example a heat seal lacquer, is applied for the transfer to the target substrate, as shown in FIG. 12 (d).
  • the carrier film 152 of the first Layer composite 150 can then be removed by separation winding and further layers of the thread structure, such as an adhesion promoter and a heat seal lacquer, can be applied to the then exposed liquid crystal layers 154 and 156.
  • the security element 70 is placed with the heat-sealing adhesive layer 38 on the target substrate 200 and pressed on in regions.
  • the pressing can take place, for example, with a heated transfer stamp (not shown) or a transfer roller.
  • the adhesive layer 38 bonds in the desired areas 202 to the target substrate 200, so that a transfer element, possibly with a predetermined outline shape, is created.
  • 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 can be specially treated.
  • an adhesion promoter can be applied to the surface of the target substrate 200.
  • a first layer composite 212 is produced from a first transparent carrier film 232, a regionally applied, in particular printed layer with flat metal pigments 234 and a transfer auxiliary layer 236, for example a UV-crosslinkable lacquer layer.
  • Printing inks with such flat metal pigments result in particularly good brilliance if they are 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 producing an aluminum layer 242 with cutouts in the form of negative writing on a second carrier film 246 and applying a magnetic layer 244, in the exemplary embodiment in the form of a coding, to the aluminum layer.
  • the second layer composite 222 is then laminated onto the first layer composite 212 in register with an adhesive layer 238. Subsequently, further layers, not shown here, which are required for embedding 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 seal lacquer, is applied for the transfer to the target substrate.
  • the carrier film 232 can be removed by separation winding and further layers of the thread structure, such as an adhesion promoter and a heat seal lacquer, can be applied to the then exposed layers 234 and 236, respectively.
  • the black magnetic areas are removed by the application of the highly opaque, flat metal pigments. holding ink concealed.
  • 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, applied to the entire surface of 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.
  • a lacquer layer which is applied to a transparent carrier film and has a suitable surface quality.
  • a transfer auxiliary layer can optionally also be applied to the effect layer.
  • the detachability of the carrier film from the effect layer can also be ensured by a release layer which supports the separation under the corresponding transmission conditions.
  • the carrier film can then e.g. additionally have a release layer which can be thermally activated under heat sealing conditions, as illustrated in the exemplary embodiment in FIG. 4, to which the effect layer is then applied.
  • an adhesive layer is also applied to the effect layer.
  • the adhesive Layer can also be provided on the second layer composite. If desired or necessary, the carrier film can finally be removed again by means of a separating winding.

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  • Chemical & Material Sciences (AREA)
  • Finance (AREA)
  • Accounting & Taxation (AREA)
  • Business, Economics & Management (AREA)
  • Manufacturing & Machinery (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Health & Medical Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Credit Cards Or The Like (AREA)
  • Decoration By Transfer Pictures (AREA)
  • Polarising Elements (AREA)
  • Laminated Bodies (AREA)

Abstract

L'invention concerne un matériau de transfert pour le transfert à un substrat cible, ainsi qu'un procédé de production de tels matériaux de transfert. Le procédé selon l'invention est caractérisé en ce qu'on prépare une feuille support en matière plastique (32), on applique, sur cette couche support (32), une couche à effet (34), on applique une couche auxiliaire de transfert (36), sur toute la surface, sur la couche à effet (34) et la couche support (32), l'adhérence de la couche auxiliaire de transfert (36) à la feuille support (32) étant inférieure à l'adhérence à la couche à effet (34). On applique ensuite une couche d'adhésif (38) pour le transfert du composite stratifié formé au substrat cible (35).
EP05739976.8A 2004-04-30 2005-04-29 Element de securite et son procede de production Active EP1744900B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP10014129.0A EP2287011B1 (fr) 2004-04-30 2005-04-29 Elément de sécurité et son procédé de fabrication
EP09004830.7A EP2123471B1 (fr) 2004-04-30 2005-04-29 Elément de sécurité et son procédé de fabrication

Applications Claiming Priority (4)

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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

Related Child Applications (4)

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EP09004830.7A Division EP2123471B1 (fr) 2004-04-30 2005-04-29 Elément de sécurité et son procédé de fabrication
EP09004830.7A Division-Into EP2123471B1 (fr) 2004-04-30 2005-04-29 Elément de sécurité et son procédé de fabrication
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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EP1744900A2 true EP1744900A2 (fr) 2007-01-24
EP1744900B1 EP1744900B1 (fr) 2016-07-20

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EP10014129.0A Revoked EP2287011B1 (fr) 2004-04-30 2005-04-29 Elément de sécurité et son procédé de fabrication
EP05739976.8A Active EP1744900B1 (fr) 2004-04-30 2005-04-29 Element de securite et son procede de production

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

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US (1) US20070211238A1 (fr)
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Also Published As

Publication number Publication date
US20070211238A1 (en) 2007-09-13
WO2005108108A2 (fr) 2005-11-17
EP2287011A3 (fr) 2016-04-13
EP2123471B1 (fr) 2015-07-08
EP2123471A1 (fr) 2009-11-25
WO2005108108A8 (fr) 2006-01-05
EP2287011A2 (fr) 2011-02-23
EP2287011B1 (fr) 2017-06-28
EP1744900B1 (fr) 2016-07-20
WO2005108108A3 (fr) 2006-04-06

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