• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a security element with tamper evidence, in particular a security label or a transferable element, characterized in that it comprises the following layers: a) a first layer, which is an embossed carrier substrate, or a carrier substrate which comprises a lacquer layer which is an optically active B) a second layer which constitutes a liquid-crystalline layer, c) a light-absorbing layer, d) an adhesive coating, the adhesion between the layers a. and b. is less than the adhesion between the layers b. c. and d. and wherein the security element has a color shift effect.
    公开号:AT516128A1
    申请号:T565/2014
    申请日:2014-07-17
    公开日:2016-02-15
    发明作者:Marco Mayrhofer；Georg Aigner
    申请人:Hueck Folien Gmbh；
    IPC主号:
    专利说明:

    Security element with color shift effect and tamper evidence
    The invention relates to a security element, in particular a security label, which allows a proof of tampering.
    In particular, the present invention relates to security elements having a color-shift effect and an undetectable further security feature that becomes recognizable only after a tampering attempt.
    WO 01/93231 A discloses a security label which has two microstructures, one of which is a diffractive structure which is also recognizable in the non-manipulated state and the other one a release-controlling structure. In a manipulation attempt, at least parts of a reflective layer are peeled off whereby a new visually recognizable information becomes visible.
    From EP 2 234 091 A a security label is known, which has an optically active structure which is not visible in the intact state and which becomes recognizable only after a manipulation attempt.
    The object of the present invention was to provide a security element, in particular a security label, which permits a verification of manipulation, wherein the security label has a color shift effect as a security feature and an additional security feature that is recognizable only when manipulated and is not recognizable in the non-manipulated state.
    Furthermore, the security element should have a smooth, non-sticky surface on both surfaces in a tampered condition.
    The invention therefore provides a security element mitManipulationsnachweis, in particular a security label or a transferable element, characterized in that it comprises the following layers: a. a first layer, which is a full-surface or partially embossed carrier substrate 8, or a carrier substrate 1, which has a full-surface or partial lacquer layer 6, which has an optically active structure 7 or a full-surface or partial first liquid-crystalline layer 2, b. a second layer, which is a liquid-crystalline layer 3, c. optionally a light absorbing layer 4, d. an adhesive coating 5, the adhesion between the layers a. and b. is less than the adhesion between the layers b. c. and d. and wherein the security element has a color shift effect.
    The first layer may be an embossed carrier substrate, or a carrier substrate having a resist layer having an optically active structure or a first liquid crystalline layer.
    Embossed carrier substrates may for example be hot stamping foils or replication lacquer layers, wherein the replicating lacquer coating may be hardening or physically curing.
    As carrier substrates, for example, carrier films preferably comprise flexible plastic films, for example of PI, PP, MOPP, PE, PPS, PEEK, PEK, PEI, PSU, PAEK, LCP, PEN, PBT, PET, PA, PC, COC, POM, ABS, PVC, Fluoropolymers such as Teflon and the like in question. The carrier films preferably have a thickness of 5 to 700 μm, preferably 5 to 200 μm, more preferably 5 to 100 μm.
    Furthermore, coextruded or chemically or physically pretreated plastic films, for example acrylate-coated plastic films, can also be used as the carrier substrate.
    The carrier substrate may optionally be coated with a primer.
    Optionally, orientation layers may also be provided to enhance the effect of the layer of liquid crystal material.
    A first lacquer layer or a first layer of a liquid-crystalline material is applied to the carrier substrate.
    This first lacquer layer may be a radiation-curable lacquer layer or a thermoplastic lacquer layer and has an optically active structure.
    The radiation-curable lacquer may, for example, be a radiation-curable lacquer system based on a polyester, an epoxy or polyurethane system containing two or more different photoinitiators known to those skilled in the art which can initiate curing of the lacquer system to varying degrees at different wavelengths. Thus, for example, one photoinitiator can be activated at a wavelength of 200 to 400 nm, the second photoinitiator can then be activated at a wavelength of 370 to 600 nm. Sufficient difference should be maintained between the activation wavelengths of the two photoinitiators, so that too much excitation of the second photoinitiator does not occur The region in which the second photoinitiator is excited should be in the transmission wavelength range of the carrier substrate used. For the main cure (activation of the second photoinitiator), electron radiation may also be used.
    As the radiation-curable varnish, a water-thinnable varnish may also be used. Preference is given to polyester-based paint systems.
    The impression of the surface structure, that is the diffraction, diffraction or relief structure, is carried out, for example, at a controlled temperature by means of a die or by using an embossing mold in the radiation-curable lacquer layer which has been pre-cured by activation of the first photoinitiator to the gel point and at this stage at the time of the impression.
    If a water-dilutable radiation-curable varnish is used, it is optionally possible to precede predrying, for example by IR emitters.
    The thermoplastic varnish which is subsequently stabilized consists of a base of MMA or ethylcellulose or cycloolefin copolymer, the base polymer being used to adjust the required thermoplastic properties. Modifiers are added to adjust the subsequent stabilizability.
    Depending on the base polymer, modifiers include, for example, additives for adjusting the desired glass transition temperature, the range in which the paint is in a thermoplastic state, or modifiers for achieving permanent curing of the paint.
    Preferably, the components are dissolved in a solvent, for example in aqueous solvents, water, alcohols, ethyl acetate, methyl ethyl ketone and the like, or mixtures thereof.
    For example, particularly preferably nitrocellulose is added to an MMA based paint to increase the glass transition temperature.
    Polyethylene waxes, for example, are particularly advantageously added to a lacquer based on cycloolefin copolymers.
    An ethylcellulose-based varnish is added to customary crosslinkers to adjust the curability.
    The concentration of the base polymer in the final paint is 4-50%, depending on the base polymer, the desired properties of the paint, and the type and concentration of the modifiers.
    The structuring can be carried out by means of a conventional thermal embossing process.
    The layer thickness of the applied lacquer may vary depending on the requirements of the final product and thickness of the substrate and is generally between 0.5 and 50 μm, preferably between 2 and 10 μm, more preferably between 2 and 5 μm.
    By optically active structure are meant here in particular diffraction-optically active structures, such as holograms, surface reliefs, diffraction structures, diffraction gratings, kinegrams, or embossments of a depth of 1 - 100 pm and the like.
    The first layer may also be a first liquid crystalline layer having an optically variable effect. This liquid crystal layer may also consist of an ink containing pigments of liquid crystal material. In particular, the pigments consist of cholesteric or a mixture of nematic and cholesteric liquid crystals.
    Subsequently, a second layer of a (further) liquid-crystalline material is applied to the first layer.
    If the first layer comprises a lacquer layer which has an optically active structure or an embossed carrier substrate, this liquid-crystalline layer adapts to the structure of the optically active layer, the liquid crystals orient themselves in the structures and a color-shift effect develops. The optically active effect is not recognizable.
    If the first layer consists of a first liquid-crystalline layer, the second liquid-crystalline layer preferably has a different color shade than the first liquid-crystalline layer.
    As another layer c. an optionally light-absorbing layer is applied. This light-absorbing layer may be full-surface or partially applied.
    This layer may be formed of either a light absorbing ink, preferably a dark or black pigment ink or a light absorbing metallic coating.
    As the light-absorbing metallic layer, there are preferably used stoichiometric alumina and stoichiometric or stoichiometric copper oxide. The light-absorbing metallic layer has a preferably dark to black color. The greater the absorption of the background in the visible spectral range (350-800 nm), the greater the visible optically variable effect.
    If necessary, the light-absorbing layer can be replaced by a dark background on the object to be protected or by a corresponding colored adhesive coating.
    An adhesive coating, preferably a self-adhesive coating, cold-seal adhesive coating or hot-seal adhesive coating, is applied to this structure.
    With this adhesive coating, the security element is fixed on the zusichernden object.
    If the assembly is applied to an object to be protected by means of a self-adhesive coating or a cold seal coating, the adhesion between the layers a. and b. less than the adhesion between the layers b., c. and d., and less than the adhesion of the adhesive layer on the object to be secured.
    The adhesion between the layers a. and b. can in a wide range by surface treatment of the layer a. be set. Suitable surface treatment methods include, for example, physical or chemical surface treatment, plasma (low pressure or atmospheric plasma), corona or flame pretreatment, or pressure pretreatment.
    In a further embodiment, alternatively, between the layer a. and the layer b. a poorly adherent lacquer layer are introduced, for example poorly adhering layers based on cycloolefin copolymers, nitrocellulose, acrylates, polyvinyl chloride, ethylene acrylate copolymers or styrene acrylates. To adjust the adhesion, preferably chlorinated polyolefins are added. The proportion of the chlorinated polyolefins in the composition may be 0 to 130% by weight relative to the base polymer.
    Alternatively, any coating systems whose adhesion is reduced by an additive, for example Byk 394®, can be used.
    The poorly adhering lacquer layer points to the layer b. better adhesion than to layer a. on. In a tampering attempt, the structure then separates between the poorly adherent lacquer layer and the layer.
    In intact condition the security element shows a color shift effect. In the case where the first layer consists of a full-area or partially embossed carrier substrate or a carrier substrate having a full-area or partial lacquer layer having an optically active structure, the color tone effect corresponds to the color-shift effect of the layer of a liquid-crystalline material b .. In In the case where the first layer is composed of a first liquid crystalline material, the color tone of a mixed color corresponds to the color shift effects of the two liquid crystal layers.
    In a tampering attempt, especially when attempting to peel the foil or label from the object to be secured, the first layer a. from the second layer b. separated.
    If the first layer consists of a full-area or partially embossed carrier substrate or a carrier substrate which has a full-area or partial lacquer layer which has an optically active structure, the initially unrecognizable optically active structure in the manipulation attempt in the first (withdrawn) as positive and in the second ( on the object to be secured) layer of liquid-crystalline material recognizable as a negative.
    If the first layer consists of a layer of a first liquid-crystalline material, the tint or color-shift effect of the second liquid-crystalline layer, which differs from the hue or color-shift effect of the intact security element, can be discerned after a manipulation attempt on the substrate to be secured.
    If the security element is applied in the form of a transfer element to the object to be secured, the authenticity can be detected by means of an aid, for example by means of the so-called Tesa test. An adhesive strip is applied to the security element and subsequently pulled off. The optically active structure introduced into the first lacquer layer is recognizable as negative both in the lacquer layer remaining on the adhesive strip as positive and in the lacquer layer remaining on the object to be protected.
    In addition, the surface of the lacquer layer remaining on the article to be secured, as well as the surface of the peeled part, is dry and does not feel sticky (dry peel effect).
    The security element according to the invention can be applied as a security element to packaging materials or used in ready-made form as labels in any shape (angular, round, oval) or as adhesive tape for securing objects or packaging.
    FIGS. 1 to 7 show exemplary embodiments of the security element according to the invention.
    In the figures, 1 denotes a carrier substrate 2 a layer of a first liquid-crystalline material 3 a layer of a (second) liquid-crystalline material 4 a light-absorbing layer 5 an adhesive coating 6 a lacquer layer 7 an optically active structure 8 an embossed carrier substrate 9 a primer layer
    FIG. 1 shows a security element comprising a carrier substrate 1 provided with a first layer of liquid crystal material 2. On this first layer of a first liquid crystalline material 2, a second layer of a second different liquid crystal material 3 is deposited.
    The light-absorbing layer 4 consists of a black printing layer in this example. By means of a self-adhesive coating 5, the security element can be fixed to the object to be secured. In doing so, a superimposed color shift effect from both layers 2 and 3 is recognizable.
    In a tampering attempt, the first liquid crystal layer 2 separates from the second liquid crystal layer 3 because the adhesion between these two layers is set to be weaker than the adhesion of the remaining layers to each other.
    After a manipulation attempt, the color tone or the color-shift effect of the second liquid-crystal layer 3, which differs from the color tone or color-shift effect of the intact security element, is recognizable on the substrate to be protected.
    In FIG. 2, instead of the first liquid-crystalline layer, a lacquer layer 6, which has an optically active structure 7, is provided. The light-absorbing layer 4 is formed of a coating of unstoichiometric alumina. This light-absorbing layer 4 is then provided with a primer layer 9. To fix the security element on the object to be secured, a hot-seal lacquer coating is provided as the adhesive coating 5.
    In the intact state, the optically active effect is not recognizable, provided that the refractive index of the lacquer layer 6 is adapted to the refractive index of the layer 3 of liquid-crystalline material. However, the color shift effect caused by the layer 3 can be recognized. In a tampering attempt, the optically active structure separates from the layer of liquid crystal material 3, the optically active structure being recognizable as negative in both the first (stripped) layer as positive and in the second (remaining on the object to be protected) layer of liquid crystal material.
    In Figure 3, a layer of a liquid crystal material 3 is applied to an embossed carrier substrate, for example, a hot stamping foil 8. As the light-absorbing layer 4, a partial metallic coating of unstoichiometric copper oxide is deposited.
    The security element is fixed by means of a self-adhesive coating 5 on the zuzusden object. In a manipulation attempt, the layer of liquid-crystalline material 3 separates from the hot stamping foil 8.
    In the intact state, the optically active effect is not recognizable, provided that the refractive index of the hot stamping foil 8 is adapted to the refractive index of the layer 3 of liquid crystal material. However, the color shift effect caused by the layer 3 can be recognized. In a tampering attempt, the optically active structure separates from the layer of liquid crystal material 3, the optically active structure of the hot stamping foil being visible as negative in both the first (stripped) layer as positive and in the second (remaining on the object to be secured) layer of liquid crystal material ,
    FIG. 4 shows an embodiment which does not have a non-absorbing layer in construction. In this case, the intensity of the visible color-shift effect is determined by the light absorption of the object to be protected.
    The lower the light absorption of the substrate, the weaker is the color-shift effect. In a tampering attempt, a security element according to this embodiment behaves analogously to the security element shown in FIG.
    The security element according to FIG. 5 is constructed analogously to the security element shown in FIG. 2, but with a partial layer 3 of liquid-crystalline material.
    In intact condition, the color shift effect is partially recognizable. In a manipulation attempt, a security element according to this embodiment behaves substantially analogously to the security element illustrated in FIG. The layer of liquid-crystalline material separates from the lacquer layer 6, which has an optically active structure 7. In those areas where the layer 3 is absent, the light absorbing layer 4 remains on the layer 6.
    In the embodiment according to FIG. 6, the lacquer layer 6 is provided with a partially optically active structure.
    In the intact state, this partial optically active effect is not recognizable, provided that the refractive indices of the lacquer layer 6 and the layer 3 are matched to one another. If the two refractive indices are not matched, the optically active effect can be seen even when intact.
    In a tampering attempt, the security element according to this embodiment behaves analogously to the security element shown in FIG. 2. In a further embodiment, both the lacquer layer 6 and the optically active structure 7 can be partially provided.
    In the embodiment shown in Fig. 7, both the liquid crystal material layer 3 and the light absorbing layer 4 are partially made.
    In this case, the color shift effect is partially recognizable both when intact and after a manipulation attempt.
    权利要求:
    Claims (12)
    [1]
    1) security element with tamper evidence, in particular a security label or a transferable element, characterized in that it comprises the following layers: a. a first layer, which is a full-surface or partially embossed carrier substrate 8, or a carrier substrate 1, which has a full-surface or partial lacquer layer 6, which has an optically active structure 7 or a full-surface or partial first liquid-crystalline layer 2, b. a second layer, which is a liquid-crystalline layer 3, c. optionally a light absorbing layer 4, d. an adhesive coating 5, the adhesion between the layers a. and b. is less than the adhesion between the layers b. c. and d. and wherein the security element has a color shift effect.
    [2]
    2) A security element according to claim 1, characterized in that, in the case that the first layer is a carrier substrate 1 comprising a lacquer layer 6 having an optically active structure 7 or a first liquid crystal layer 2 between the support substrate 1 and the lacquer layer 6 or liquid crystal layer 2, a primer is applied.
    [3]
    3) Security element according to one of claims 1 or 2, characterized in that the adhesion between the layers a. and b. adjusted by physical or chemical surface modification.
    [4]
    4) A security element according to any one of claims 1 to 3, characterized in that the optically active structure 7 is a diffractive optical active structure, such as a hologram, a surface relief, a diffraction structure, a diffraction grating, a kinegram or a coinage of a depth of 1 -100 pm.
    [5]
    5) Security element according to one of claims 1 to 4, characterized in that in the event that the layer a. represents a first liquid crystal layer 2 deposited on a support substrate 1, the second liquid crystal layer 3 has a different color tone than the first liquid crystal layer 2.
    [6]
    6) A security element according to any one of claims 1 to 5, characterized in that the first lacquer layer 6 is a radiation-curable lacquer layer.
    [7]
    7) A security element according to any one of claims 1 to 5, characterized in that the first lacquer layer 6 is a thermoplastic lacquer layer.
    [8]
    8) A security element according to any one of claims 1 to 7, characterized in that the lacquer layer 6 or the first liquid-crystalline layer 2 or the liquid-crystalline layer 3 are implemented as partial layers.
    [9]
    9) Security element according to one of claims 1 to 8, characterized in that the light-absorbing layer 4 is applied partially or ganzflächig.
    [10]
    10) A security element according to any one of claims 1 to 9, characterized in that the light-absorbing layer 4 is formed by a light-absorbing printing layer or a light-absorbing metallic coating.
    [11]
    11) Security element according to one of claims 1 to 10, characterized in that the adhesive coating 5 is a self-adhesive, a cold seal or a heat-seal coating.
    [12]
    12) Use of the security element according to one of claims 1 to 11 for security labels, adhesive tapes or security films.
    类似技术:
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    同族专利:
    公开号 | 公开日
    EP3170168A1|2017-05-24|
    AT516128B1|2018-05-15|
    RU2016146202A|2018-08-17|
    JP2017530380A|2017-10-12|
    MX2017000787A|2017-05-04|
    CN106463071A|2017-02-22|
    WO2016008553A1|2016-01-21|
    US20170249875A1|2017-08-31|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    EP1894736A2|2006-08-28|2008-03-05|Giesecke & Devrient GmbH|Security element with a color-shift effect and method for producing said security element|
    WO2008046537A2|2006-10-19|2008-04-24|Giesecke & Devrient Gmbh|Security feature comprising liquid crystal layers|
    WO2010108567A1|2009-03-27|2010-09-30|Hueck Folien Ges.M.B.H.|Security element, particularly security element having evidence of manipulation|
    WO2013050140A1|2011-10-04|2013-04-11|Hueck Folien Ges.M.B.H.|A security element with a color shift effect, and methods for the production and use thereof|
    GB0013379D0|2000-06-01|2000-07-26|Optaglio Ltd|Label and method of forming the same|
    JP4257903B2|2003-10-28|2009-04-30|日本発條株式会社|Identification medium, identification medium identification method, identification target article, and identification apparatus|
    JP4565541B2|2003-10-31|2010-10-20|日本発條株式会社|Identification medium and article to be identified|
    CN100550085C|2004-12-24|2009-10-14|日本发条株式会社|Discern medium, possess article, recognition methods and the recognition device of discerning medium|DE102017006507A1|2017-07-10|2019-01-10|Giesecke+Devrient Currency Technology Gmbh|structural element|
    CN108461033A|2018-03-07|2018-08-28|厦门吉宏包装科技股份有限公司|A kind of antifalse material and its processing technology|
    CN108711358A|2018-05-15|2018-10-26|中钞油墨有限公司|A kind of individualized security element|
    法律状态:
    2020-03-15| MM01| Lapse because of not paying annual fees|Effective date: 20190717 |
    优先权:
    申请号 | 申请日 | 专利标题
    ATA565/2014A|AT516128B1|2014-07-17|2014-07-17|Security element with color shift effect and tamper evidence|ATA565/2014A| AT516128B1|2014-07-17|2014-07-17|Security element with color shift effect and tamper evidence|
    PCT/EP2015/000823| WO2016008553A1|2014-07-17|2015-04-20|Security element with color shift effect and manipulation detection|
    EP15738262.3A| EP3170168A1|2014-07-17|2015-04-20|Security element with color shift effect and manipulation detection|
    JP2017502667A| JP2017530380A|2014-07-17|2015-04-20|Security element with color shift effect and tamper-evident prevention function|
    MX2017000787A| MX2017000787A|2014-07-17|2015-04-20|Security element with color shift effect and manipulation detection.|
    CN201580027336.XA| CN106463071A|2014-07-17|2015-04-20|Security element with color shift effect and manipulation detection|
    US15/310,153| US20170249875A1|2014-07-17|2015-04-20|Security element with color shift effect and manipulation detection|
    RU2016146202A| RU2016146202A|2014-07-17|2015-04-20|PROTECTIVE ELEMENT WITH COLOR CHANGE EFFECT AND MANIPULATION INDICATION|
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