EP2004420A1 - Security element and method for its production - Google Patents
Security element and method for its productionInfo
- Publication number
- EP2004420A1 EP2004420A1 EP07723373A EP07723373A EP2004420A1 EP 2004420 A1 EP2004420 A1 EP 2004420A1 EP 07723373 A EP07723373 A EP 07723373A EP 07723373 A EP07723373 A EP 07723373A EP 2004420 A1 EP2004420 A1 EP 2004420A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- layer
- security element
- element according
- security
- embossed
- 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
Links
- 238000000034 method Methods 0.000 title claims description 24
- 238000004519 manufacturing process Methods 0.000 title claims description 10
- 230000000694 effects Effects 0.000 claims abstract description 27
- 239000002178 crystalline material Substances 0.000 claims abstract description 19
- 230000003098 cholesteric effect Effects 0.000 claims abstract description 9
- 239000010410 layer Substances 0.000 claims description 117
- 238000004049 embossing Methods 0.000 claims description 18
- 239000004973 liquid crystal related substance Substances 0.000 claims description 18
- 239000002184 metal Substances 0.000 claims description 14
- 239000011230 binding agent Substances 0.000 claims description 13
- 230000005855 radiation Effects 0.000 claims description 12
- 239000000049 pigment Substances 0.000 claims description 11
- 229920001169 thermoplastic Polymers 0.000 claims description 6
- 239000004416 thermosoftening plastic Substances 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 5
- 229920000106 Liquid crystal polymer Polymers 0.000 claims description 4
- 238000010894 electron beam technology Methods 0.000 claims description 4
- 239000011888 foil Substances 0.000 claims description 4
- 239000011159 matrix material Substances 0.000 claims description 4
- 239000002861 polymer material Substances 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims 2
- 239000004922 lacquer Substances 0.000 description 16
- 239000004986 Cholesteric liquid crystals (ChLC) Substances 0.000 description 6
- 238000004132 cross linking Methods 0.000 description 5
- 238000001723 curing Methods 0.000 description 5
- 150000001252 acrylic acid derivatives Chemical class 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000003973 paint Substances 0.000 description 4
- 239000002904 solvent Substances 0.000 description 4
- 238000003848 UV Light-Curing Methods 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 229920002799 BoPET Polymers 0.000 description 2
- 239000004977 Liquid-crystal polymers (LCPs) Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000012939 laminating adhesive Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 239000004988 Nematic liquid crystal Substances 0.000 description 1
- 239000004721 Polyphenylene oxide Substances 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-M acrylate group Chemical group C(C=C)(=O)[O-] NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000003085 diluting agent Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 150000002170 ethers Chemical class 0.000 description 1
- 239000004920 heat-sealing lacquer Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- 230000001151 other effect Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000004926 polymethyl methacrylate Substances 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 239000012780 transparent material Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
- B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
- B42D25/29—Securities; Bank notes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
- B42D25/30—Identification or security features, e.g. for preventing forgery
- B42D25/324—Reliefs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
- B42D25/30—Identification or security features, e.g. for preventing forgery
- B42D25/328—Diffraction gratings; Holograms
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
- B42D25/30—Identification or security features, e.g. for preventing forgery
- B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
- B42D25/364—Liquid crystals
-
- B42D2033/26—
-
- B42D2035/24—
-
- 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
- B42D25/21—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose for multiple purposes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
- B42D25/30—Identification or security features, e.g. for preventing forgery
- B42D25/355—Security threads
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
- B42D25/30—Identification or security features, e.g. for preventing forgery
- B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
- B42D25/369—Magnetised or magnetisable materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
- B42D25/40—Manufacture
- B42D25/405—Marking
- B42D25/425—Marking by deformation, e.g. embossing
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
Definitions
- the invention relates to a security element for security papers, value documents and the like having a diffraction structure which has an embossed relief structure and a covering layer which increases the visibility of the diffraction effect of the embossed relief structure.
- the invention also relates to a security paper and a value document with such a security element and to a method for producing such security elements.
- Holograms, holographic grids and other hologram-like diffraction patterns are widely used to authenticate credit cards, value documents, product packaging and the like.
- Such diffraction-optical structures for security elements are described, for example, in the document EP 0 330 733 A1.
- holograms and hologram-type diffraction structures have increasingly been used not only as security features but also purely decoratively in safety-critical applications, so that the observers' attention to holograms used as security features is waning.
- the characteristic visual effect is often no longer perceived by the observers as a security feature, but merely as a design variant.
- conventional embossing holograms have no special protection against counterfeiting.
- the invention has for its object to provide a generic security element that avoids the disadvantages of the prior art and in particular has a high anti-counterfeiting security.
- a method for producing such a security element is to be specified. This object is achieved by the security element and the manufacturing method having the features of the independent claims. Further developments of the invention are the subject of the dependent claims.
- the relief structure is formed on the basis of a cholesteric liquid-crystalline material and that the cover layer contains a reflective and / or a high-index layer.
- This design combines a prominent holographic effect with a striking and highly visible color-shift effect.
- the relief structure is formed from a cholesteric liquid-crystalline polymer material.
- the layer thickness of the embossed relief structure in this variant is preferably between about 1.5 ⁇ m and about 4 ⁇ m.
- the liquid-crystalline material of the relief structure is present in the form of pigments which are embedded in a binder matrix.
- the binder expediently has thermoplastic properties.
- the preferred layer thicknesses are therefore greater values in the range of about 3 microns to about 10 microns.
- the liquid-crystalline material is in crosslinked form. This can be done, for example, by the Use of a UV-crosslinking liquid crystal system can be achieved, as described in more detail below.
- a UV-crosslinking liquid crystal system can be achieved, as described in more detail below.
- Such liquid crystal systems can be advantageously formed by combining a nematic liquid crystal system with a twisting device.
- suitable UV-crosslinking liquid crystal systems are free-radically curing liquid crystal systems in which the UV crosslinkability is achieved via reactive double bonds, such as acrylate groups.
- the overall system is formulated so that buildup on the stamping tool can be avoided.
- the choice of the binder is decisive for the structural stability of an embossment.
- the binder is preferably thermoplastic.
- PMMA thermoplastic binder PMMA into consideration.
- a UV-crosslinking system can be used as a binder.
- suitable UV-crosslinking systems are polyester acrylates, polyurethane acrylates, polyether acrylates and epoxy acrylates in conjunction with a suitable reactive diluent.
- the liquid-crystal pigments are preferably formed by crosslinked liquid crystals which are temperature-stable.
- the cover layer contains an at least partially present, reflective metal layer, which may have recesses in the form of patterns, characters or codes.
- a high refractive index layer is advantageously arranged above the reflective layer. Both in cases where the high-index layer is combined with a reflective layer, as well as in cases where the cover layer contains only one high-index layer, it can be formed, for example, from ZnS or TiO 2 .
- the liquid-crystalline material of the relief structure is preferably applied to a carrier film designed for aligning liquid crystals.
- the carrier foil may also be provided with an alignment layer for alignment of liquid crystals.
- a smooth PET film of good surface quality can advantageously be used as the carrier film.
- the carrier film may also comprise a plurality of partial layers, for example an above-mentioned alignment layer.
- an alignment layer for example, a layer of a linear photopolymer, a finely structured layer or a trained by exerting shear forces layer is possible.
- a suitable finely structured layer can be produced for example by embossing, etching or scoring.
- the security element may include an absorbing background area for viewing the diffraction effect and the color shift effect.
- the background region is formed in particular by a dark, for example black, printing layer and may also contain other security features, such as magnetic or electrically conductive feature substances.
- the security element may also contain one or more further layers of liquid-crystalline material.
- the diffraction structures form a matt structure and thus a matte, preferably silvery matte finish. pearance.
- the relief structures of the diffraction structures in this case contain an electromagnetic radiation-influencing grid pattern which is characterized by the parameters orientation, curvature, spacing and profiling and for which at least one of these parameters varies randomly over the area of the grid area, ie is subject to a statistical distribution.
- the described security element may in particular be a security strip, a security thread, a label or a transfer element for application to a security paper, value document and the like.
- the invention also encompasses a security paper for the production of security documents, such as banknotes, identity cards or the like, which is equipped with a security element described above, as well as a value document equipped with a security element described above, such as a banknote.
- the invention further includes a method for producing a security element of the type described, in which
- a layer based on a cholesteric liquid-crystalline material is applied to a carrier film
- the applied layer is embossed to a relief structure of a desired diffraction structure
- the embossed layer is provided with a visibility-enhancing cover layer containing a reflective and / or a high refractive index layer.
- the layer is printed in step a) on the basis of the cholesteric liquid-crystalline material, wherein the printing method is selected according to the requirements of the paint system used.
- the layer applied in step a) can be precured in the manner described in more detail below.
- the applied layer in the embossing in step b) is suitably radiation-cured at least to the extent that the embossed structures do not flow during the subsequent process steps.
- the curing during embossing is carried out in particular by applying the applied layer with UV radiation or electron radiation. This application can be carried out through the carrier film or through the embossing tool.
- the embossed layer is advantageously cured, in particular by exposure to UV radiation or electron radiation.
- this step forms the main cure, as described in more detail below.
- the embossed layer is provided in step c) first at least partially with a reflective metal layer.
- the metal layer can also be produced in this step with recesses in the form of patterns, characters or codes, for which purpose, for example, the washing method known from the document WO 99/13157 A1 can be used.
- a high-index layer is advantageously applied in step c).
- the high-index layer is vapor-deposited by a vacuum vapor method.
- FIG. 1 is a schematic representation of a banknote with an embedded security thread and a glued transfer element
- Fig. 2 shows schematically the layer structure of a security element according to the invention in cross section
- FIG. 3 shows a cross section through a transfer element according to the invention prior to application to a target substrate
- FIG. 4 shows a cross section through a transfer element according to a further exemplary embodiment of the invention after application to a target substrate.
- Fig. 1 shows a schematic representation of a banknote 10, which is provided with two security elements 12 and 16 according to embodiments of the invention.
- the first security element represents a security thread 12 which at certain window areas 14 on the surface of the banknote 10, while being embedded in the intervening areas inside the banknote 10.
- the second security element is formed by a glued transfer element 16 of any shape.
- FIG. 2 schematically shows the layer structure of a security element 20 according to the invention in cross-section, with only the elements of the layer structure required for explaining the functional principle being shown.
- a lacquer layer 24 made of a cholesteric liquid crystal material which exhibits the desired color-shift effect is printed on a plastic carrier foil 22.
- a printing process it is possible to use all processes known to the person skilled in the art and tailored to the requirements of the coating system used.
- the orientation of the liquid-crystalline material is preferably carried out directly over the carrier film. However, it is also possible to provide alignment layers on the carrier film which align the liquid crystals approximately by the application of shear forces or by electrostatic means.
- the liquid-crystal lacquer layer 24 can first be pre-cured.
- the lacquer can contain, for example, two photoinitiators which can be activated at different UV wavelengths.
- the first photoinitiator may be UV activatable while the second photoinitiator is activated by electron beam irradiation. In both designs, the first photoinitiator is used for the pre-cure, which can be carried out, for example, to the gel point of the paint.
- the desired relief pattern 26 is embossed into the pre-cured or non-pre-cured lacquer layer 24. If the lacquer layer is not pre-cured, it is hardened during the embossing either through the carrier foil 22 or through the embossing tool with radiation to the extent that a flow of the structures is excluded in the context of the process.
- the curing can be done by UV radiation or by electron beam.
- the embossing tool may be made of a UV transparent material, such as quartz or a suitable polymer, to allow the lacquer layer to be exposed by the embossing tool.
- a transparent plastic film is used as a carrier film, UV curing can also take place through the film.
- PET films starting from the visible spectral range, are transparent down to about 310 nm.
- commercially available UV sources can be used.
- the lacquer layer 24 is cured in order to ensure tack-free and mechanical stability.
- tack "free” means that the lacquer layer is essentially tack-free in the sense of a substantially non-sticky surface, so that under a certain weight load stacked, coated film pieces can subsequently be separated from one another again without damage
- the activation of the first and second photoinitiator can be effected by different UV wavelengths, or by UV radiation (first photoinitiator) and electron radiation (second photoinitiator).
- a metal layer 28 with recesses 30 in the form of patterns, characters or codes is produced on the cured liquid-crystal lacquer layer 24.
- a negative-type metal layer can be produced, for example, by means of the demetallization process described in the document WO 99/13157 A1.
- the desired patterns, characters or codes are printed on the cured lacquer layer 24 with a high pigment ink. Due to the high pigment content, the ink forms a porous, sublime color after drying.
- the printed lacquer layer is then provided with a thin metal layer which, in the area of the paint application, only partially covers the color body because of its large surface area and the porous structure.
- the paint application and the overlying metal layer can then be removed by washing with a A suitable solvent can be removed, so that in the metal layer in the originally printed areas recesses 30 are generated.
- the hologram formed by the relief pattern 26 is now clearly visible and combined with a slight color-shift effect resulting from the liquid crystals of the cholesteric liquid crystal material.
- a highly refractive ZnS layer 32 is vapor-deposited over its entire area onto the previously obtained layer sequence.
- the large difference ⁇ n (nzns - ⁇ LC) of the refractive indices of ZnS layer 32, nzns, and liquid crystal layer 24, nu: enhances both the holographic effect in the demetallized areas 30 and the color effect of the color-shift effect.
- the absorbent background may be a separate object held behind the security element.
- a dark, in particular black imprint can be provided elsewhere on the banknote, over which a security element present in a window area of the banknote can be laid by bending the banknote.
- the absorbing background may be formed by a background area integrated into the security element itself, as described now with reference to FIGS. 3 and 4.
- a resist layer 44 of a cholesteric liquid crystal material having a desired color-shift effect was printed on a support film 42 and a desired relief pattern 46 in FIG the lacquer layer 44 embossed.
- a high-index ZnS layer 48 was then vapor-deposited over the whole area and the resulting layer sequence was coated with a black printing ink 50 or a black magnetic ink.
- the layer sequence 40 When used as a security element, the layer sequence 40 is applied via a heat sealing system (primer / heat sealing lacquer) or a laminating adhesive, e.g. transferred to banknote paper or abutfadenended and the carrier film 42 replaced. Also in the embodiment of FIG. 3 in which a metal layer has been dispensed with, both the hologram contained in the relief pattern 46 and the color-shift effect of the liquid crystals of the resist layer 44 appear before the dark due to the refractive index jump between ZnS layer 48 and liquid crystal resist layer 44 Background of black ink 50 brilliant in appearance.
- the embossing may or may not be associated with UV curing.
- UV-curable cholesteric liquid-crystal mixtures can, as mentioned above, also be suitably precured, so that although hot-stamping is still possible, bleeding of the structure formed is precluded.
- the UV-curable cholesteric liquid-crystal mixtures can also be printed from a solvent, in particular ethers, ketones or aromatics, and crosslinked after thermal solvent drying by radiation (UV or electron beam).
- effect lacquers 62 may also be used in which the cholesteric liquid crystal material is present in the form of pigments 66 embedded in a binder matrix 64.
- the binder 64 preferably behaves thermoplastic during embossing.
- the pigments 66 may even be substantially larger in size than the embossed structure, as long as they are only transparent. Namely, the holographic effect does not depend on the size of the pigments, but rather arises from the embossing of the (thermoplastic) binder and the cover layer, which, viewed from the viewer's perspective, contains a high-index and / or a metallic layer.
- the cover layer consists only of a high refractive index ZnS layer 68.
- a black print layer 70 is also provided as a background layer in this exemplary embodiment.
- the illustration of FIG. 4 shows the layer sequence of the security element 60 after the transfer to a target substrate, in the exemplary embodiment a banknote paper 72.
- the layer sequence was applied to the banknote paper 72 by means of a laminating adhesive 74 and for the preparation of the security element required carrier film using a release or release layer, such as a wax layer detached.
Landscapes
- Business, Economics & Management (AREA)
- Accounting & Taxation (AREA)
- Finance (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Credit Cards Or The Like (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102006015023A DE102006015023A1 (en) | 2006-03-31 | 2006-03-31 | Security element for security papers, value documents, has relief structure, which is formed on basis of cholesteric, liquid crystalline polymer material and top layer contains reflecting or high-refracting layer |
PCT/EP2007/002406 WO2007115648A1 (en) | 2006-03-31 | 2007-03-19 | Security element and method for its production |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2004420A1 true EP2004420A1 (en) | 2008-12-24 |
EP2004420B1 EP2004420B1 (en) | 2014-08-13 |
Family
ID=38249231
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07723373.2A Active EP2004420B1 (en) | 2006-03-31 | 2007-03-19 | Security element and method for its production |
Country Status (5)
Country | Link |
---|---|
US (1) | US8968856B2 (en) |
EP (1) | EP2004420B1 (en) |
CN (1) | CN101410257B (en) |
DE (1) | DE102006015023A1 (en) |
WO (1) | WO2007115648A1 (en) |
Families Citing this family (69)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1744904B2 (en) | 2004-04-30 | 2019-11-06 | Giesecke+Devrient Currency Technology GmbH | Sheeting and methods for the production thereof |
DE102004021246A1 (en) | 2004-04-30 | 2005-11-24 | Giesecke & Devrient Gmbh | Security element and method for its production |
DE102004021247A1 (en) * | 2004-04-30 | 2005-11-24 | Giesecke & Devrient Gmbh | Security element and method for its production |
DE102004039355A1 (en) | 2004-08-12 | 2006-02-23 | Giesecke & Devrient Gmbh | Security element and method for its production |
DE102004022080A1 (en) | 2004-05-05 | 2005-11-24 | Giesecke & Devrient Gmbh | Value document with visually recognizable markings |
DE102004022079A1 (en) | 2004-05-05 | 2005-11-24 | Giesecke & Devrient Gmbh | Value document with serial number |
DE102004035979A1 (en) | 2004-07-14 | 2006-02-02 | Giesecke & Devrient Gmbh | Security element and method for its production |
DE102004038542A1 (en) | 2004-08-06 | 2006-02-23 | Giesecke & Devrient Gmbh | Data carrier with security element and method for its production |
DE102004049118A1 (en) | 2004-10-07 | 2006-04-13 | Giesecke & Devrient Gmbh | Security element and method for its production |
DE102005028162A1 (en) | 2005-02-18 | 2006-12-28 | Giesecke & Devrient Gmbh | Security element for protecting valuable objects, e.g. documents, includes focusing components for enlarging views of microscopic structures as one of two authenication features |
DE102005025095A1 (en) | 2005-06-01 | 2006-12-07 | Giesecke & Devrient Gmbh | Data carrier and method for its production |
DE102005032815A1 (en) | 2005-07-12 | 2007-01-18 | Giesecke & Devrient Gmbh | Method for producing a security paper, paper screen and forming element for paper screen |
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CN101410257A (en) | 2009-04-15 |
DE102006015023A1 (en) | 2007-10-04 |
US20090115185A1 (en) | 2009-05-07 |
WO2007115648A1 (en) | 2007-10-18 |
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