EP4219182A2 - Security element, method for producing same and data carrier equipped with the security element - Google Patents

Abstract

The invention relates to a security element for protecting documents of value with a carrier, a layer structure arranged on the carrier via an embossing lacquer layer and an adhesive layer suitable for gluing the security element to an object of value, the layer structure comprising opaque, metallic areas, semi-transparent areas which a viewer give a different color impression when viewed in reflected light and when viewed in transmitted light, and has transparent areas, with both the transparent areas and the semi-transparent areas each being formed in the form of patterns, characters or a code and the opaque, metallic areas being a background represent.

Description

The invention relates to a security element for protecting documents of value with a carrier, a layer structure arranged on the carrier via an embossing lacquer layer and an adhesive layer suitable for bonding the security element to an object of value, the layer structure comprising opaque, metallic areas, semi-transparent areas that an observer convey a different color impression when viewed in reflected light and when viewed in transmitted light, and has transparent areas. The invention also relates to a method for producing such a security element and a data carrier with such a security element.

Data carriers, such as value or identification documents, or other valuables, such as branded items, are often provided with security elements for protection, which allow the authenticity of the data carrier to be checked and which at the same time serve as protection against unauthorized reproduction. Security elements with effects that depend on the viewing angle play a special role in securing authenticity, as these cannot be reproduced even with the most modern copiers. The security elements are equipped with optically variable elements that give the viewer a different image impression from different viewing angles and, for example, show a different color or brightness impression and/or a different graphic motif depending on the viewing angle.

In this context, it is known to use security elements with multi-layer thin-film elements, the color impression of which changes for the viewer with the viewing angle (in the following referred to as the color shift effect). In such thin-film elements, the color-shift effect is based on viewing-angle-dependent interference effects due to multiple reflections in the various sub-layers of the element. The path difference of the light reflected from the different layers depends on the one hand on the optical thickness of a dielectric spacer layer, which defines the distance between a semitransparent absorber layer and a reflection layer, and on the other hand varies with the respective viewing angle. Since the path difference is of the order of magnitude of the wavelength of visible light, an angle-dependent color impression results for the viewer due to the extinction and amplification of certain wavelengths. A large number of different color shift effects can be designed by a suitable choice of material and thickness of the dielectric spacer layer.

In addition, (see-through) security elements with multilayer thin-layer elements are known which appear in a first color when viewed in reflected light, ie in reflection, and in a second color when viewed in transmitted light, ie in transmission. The WO 2011/082761 A1 describes a thin film element with a multilayer structure that appears gold when viewed in reflected light and blue when viewed in transmitted light. The multilayer structure is based on two semi-transparent mirror layers and a dielectric spacer layer arranged between the two mirror layers.

Proceeding from this, the invention is based on the object of specifying a security element of the type mentioned at the outset with a high degree of protection against counterfeiting and an attractive visual appearance.

This object is solved by the features of the independent claims. Developments of the invention are the subject matter of the dependent claims.

Summary of the Invention

• 1. (First aspect of the invention) Security element for protecting documents of value with a carrier, a layer structure arranged on the carrier via an embossing lacquer layer and an adhesive layer suitable for gluing the security element to an object of value, the layer structure comprising opaque, metallic areas, semi-transparent areas, which give a viewer a different color impression when viewed in reflected light and when viewed in transmitted light, and has transparent areas, with both the transparent areas and the opaque, metallic areas each being formed in the form of patterns, characters or a code and the semi-transparent areas represent a background.
• 2. (Second aspect of the invention) Security element for securing documents of value with a carrier, a layer structure arranged on the carrier via an embossing lacquer layer and an adhesive layer suitable for gluing the security element to an object of value, the layer structure comprising opaque, metallic areas, semi-transparent areas, which give a viewer a different color impression when viewed in reflected light and when viewed in transmitted light, and has transparent areas, with both the transparent areas and the semi-transparent areas each in the form of Patterns, characters or coding are formed and the opaque metallic areas represent a background.
• 3. (Preferred embodiment) Security element according to one of clauses 1 or 2, wherein the opaque, metallic areas are based on a metallization obtainable, for example, by vapor deposition, in particular an Al or Ag metallization, or are obtainable by printing and are based on platelet-shaped metal pigments.
• 4. (Preferred embodiment) Security element according to one of clauses 1 to 3, wherein the semi-transparent areas, which give a viewer a different color impression when viewed in reflected light and when viewed in transmitted light, on one two semi-transparent mirror layers and one between the two mirror layers arranged dielectric spacer layer are based having thin-film element, wherein the thin-film element is in particular an Al / SiO ₂ / Al or an Ag / SiO ₂ / Ag thin-film element.
• 5. (Preferred embodiment) Security element according to one of clauses 1 to 3, wherein the semi-transparent areas, which give a viewer a different color impression when viewed in reflected light and when viewed in transmitted light, can be obtained by printing using an effect pigment composition.
• 6. (Preferred embodiment) Security element according to one of clauses 1 to 5, wherein the embossing lacquer layer is provided with an embossed relief structure and the relief structure is in particular a diffractive structure such as a hologram, a holographic grating image or a hologram-like diffraction structure, or an achromatic structure, such as a matte structure, or a micromirror array, or a blazed grating with a sawtooth-like groove profile, or a Fresnel lens array, or a combination of two or more of the above elements.
• 7. (Preferred embodiment) Security element according to one of clauses 1 to 6, wherein the embossing lacquer layer with an embossed relief structure in the areas formed in the form of patterns, characters or a code, namely the transparent areas on the one hand and the opaque, metallic areas on the other hand or the transparent areas on the one hand and the semi-transparent areas on the other hand, is formed with two different relief structures, in particular in such a way that one relief structure forms a diffractive structure and the second relief structure forms a micromirror arrangement.
• 8. (Preferred embodiment) The security element according to clause 7, wherein the embossing lacquer layer with an embossed relief structure has a third relief structure in the areas representing a background.
• 9. (Preferred embodiment) Security element according to one of clauses 1 to 6, wherein the embossing lacquer layer with an embossed relief structure has the same relief structure in the areas formed in the form of patterns, characters or a code and a further relief structure in the areas representing a background has, in particular such that a relief structure forms a diffractive structure and the second relief structure forms a micromirror array.
• 10. (Preferred embodiment) Security element according to one of clauses 1 to 9, each in the form of patterns, characters or a code formed areas are at least partially arranged in register with each other.
• 11. (Preferred embodiment) Security element according to one of clauses 1 to 10, where (i) the color impression of the semi-transparent areas when viewed in reflected light is identical to the color impression of the opaque, metallic areas and the color impression of the semi-transparent areas when viewed in transmitted light is different from the color impression of the opaque, metallic areas, or (ii) both the color impression of the semitransparent areas when viewed in reflected light and the color impression of the semitransparent areas when viewed in transmitted light are different from the color impression of the opaque, metallic areas.
• 12. (Preferred embodiment) Security element according to one of clauses 1 to 11, wherein the relief structure embossed in the embossing lacquer layer has the transparent areas, the metallic, opaque areas and the semi-transparent areas in three separate partial areas.
• 13. (Preferred embodiment) Security element according to one of clauses 1 to 11, wherein the relief structure embossed in the embossing lacquer layer has the transparent areas and the semi-transparent areas in two separate sub-areas and part of the semi-transparent areas is additionally provided with a metallization obtainable, for example, by means of vapor deposition or is printed with platelet-shaped metallic pigments, in order to form the metallic, opaque areas in this way.
• 14. (Preferred embodiment) Security element according to one of clauses 1 to 13, wherein the layer sequence of the security element is the following:
  1. a) carrier;
  2. b) embossing lacquer layer with an embossed relief structure;
  3. c) layer structure which has opaque, metallic areas, semi-transparent areas which give an observer a different color impression when viewed in reflected light and when viewed in transmitted light, and transparent areas;
  4. d) adhesive layer suitable for gluing the security element to an object of value.
• 15. (Preferred embodiment) Security element according to one of clauses 1 to 13, wherein the layer sequence of the security element is the following:
  1. a) adhesive layer suitable for gluing the security element to an object of value;
  2. b) carrier;
  3. c) Embossed lacquer layer with an embossed relief structure;
  4. d) layer structure which has opaque, metallic areas, semi-transparent areas which give an observer a different color impression when viewed in incident light and when viewed in transmitted light, and transparent areas;
  5. e) protective layer, in particular protective layer based on a protective lacquer.
• 16. (Preferred embodiment) Security element according to one of clauses 1 to 15, wherein the security element is a security band, a security strip, a patch or a label for application to a security paper, value document or the like.
• 17. (Third aspect of the invention) Data carrier with a security element according to one of clauses 1 to 16.
• 18. (Preferred embodiment) Data carrier according to clause 17, wherein the security element is arranged in a transparent window area of the data carrier.
• 19. (Preferred embodiment) Data carrier according to Clause 17 or 18, wherein the data carrier is a document of value, such as a banknote, in particular a paper banknote, polymer banknote or foil composite banknote, or identity card.
• 20. (Fourth aspect of the invention) Method for producing a security element for protecting documents of value, in particular a security element according to one of clauses 1 to 16, with a carrier, a layer structure arranged on the carrier via an embossing lacquer layer and a layer structure for gluing the security element with An adhesive layer suitable for an object of value, the layer structure having opaque, metallic areas, semi-transparent areas which give an observer a different color impression when viewed in incident light and when viewed in transmitted light, and transparent areas, the method comprising the following steps:
  • the step of providing a carrier substrate with an embossing lacquer layer applied thereto;
  • the step of printing a soluble wash ink in the areas outside of the metallic opaque areas to be created;
  • the step of applying a metallization, eg a reflective Al, Cr, Cu or Au layer, in particular by means of vapor deposition, with an Al layer being preferred;
  • the step of washing off the soluble wash ink together with the metallization located above the wash ink using a solvent so that metallic, opaque areas remain on the embossing lacquer layer;
  • the step of printing a soluble wash ink in the areas outside of the semi-transparent areas to be created;
  • the step of producing a multilayer structure with two semitransparent metallic layers and a dielectric layer arranged between the two semitransparent metallic layers, in particular by means of vapor deposition;
  • the step of washing off the soluble washing ink together with the multilayer structure located above the washing ink, so that in addition to the metallic, opaque areas, semitransparent areas also remain on the embossing lacquer layer and transparent areas are formed between the metallic, opaque areas and the semitransparent areas;
  • optionally the step of applying an optional primer layer; and
  • optionally the step of applying an adhesive layer, eg a heat-seal lacquer layer.
• 21. (Fifth aspect of the invention) Method for producing a security element for protecting documents of value, in particular a security element according to one of clauses 1 to 16, with a carrier, a layer structure arranged on the carrier via an embossing lacquer layer and a layer structure for gluing the security element with an adhesive layer suitable for an object of value, the layer structure having opaque, metallic areas, semi-transparent areas which an observer unites when viewed in reflected light and when viewed in transmitted light convey different color impression, and has transparent areas, comprising the following steps:
  • the step of providing a carrier substrate with an embossing lacquer layer applied thereto;
  • the step of producing metallic, opaque areas on the embossing lacquer layer by printing by means of a printing ink based on platelet-shaped metal pigments;
  • the step of printing a soluble wash ink in the areas outside of the semi-transparent areas to be created;
  • the step of producing a multilayer structure with two semitransparent metallic layers and a dielectric layer arranged between the two semitransparent metallic layers, in particular by means of vapor deposition;
  • the step of washing off the soluble washing ink together with the multilayer structure located above the washing ink, so that in addition to the metallic, opaque areas, semitransparent areas also remain on the embossing lacquer layer and transparent areas are formed between the metallic, opaque areas and the semitransparent areas;
  • optionally the step of applying an optional primer layer; and
  • optionally the step of applying an adhesive layer, eg a heat-seal lacquer layer.
• 22. (Sixth aspect of the invention) Method for producing a security element for protecting documents of value, in particular a security element according to one of clauses 1 to 16, with a carrier, a layer structure arranged on the carrier via an embossing lacquer layer and a layer structure for gluing the security element with an adhesive layer suitable for an object of value, the layer structure opaque, metallic areas, semi-transparent areas that give an observer a different color impression when viewed in incident light and when viewed in transmitted light, and transparent areas, comprises the following steps:
  • the step of providing a carrier substrate with an embossing lacquer layer applied thereto;
  • the step of printing a soluble wash ink in the areas outside semitransparent areas to be formed;
  • the step of producing a multilayer structure with two semitransparent metallic layers and a dielectric layer arranged between the two semitransparent metallic layers, in particular by means of vapor deposition;
  • the step of washing off the soluble wash ink together with the multi-layer structure located above the wash ink so that semi-transparent areas remain on the embossing varnish layer;
  • the step of printing a soluble wash ink in the areas outside of metallic opaque areas to be formed;
  • the step of applying a metallization, eg a reflective Al, Cr, Cu or Au layer, by means of vapor deposition, an Al layer being preferred, the step being carried out in such a way that part of the semi-transparent areas are additionally covered with a means metallization obtainable by vapor deposition so as to form the metallic opaque areas;
  • the step of washing off the soluble wash ink along with the metallization located above the wash ink;
  • optionally the step of applying an optional primer layer; and
  • optionally the step of applying an adhesive layer, eg a heat-seal lacquer layer.

Detailed Description of the Invention

In terms of this invention, observation in incident light is illumination of the data carrier from one side and observation of the data carrier from the same side. Observation in reflected light is therefore present, for example, when the front side of the data carrier is illuminated and also viewed.

In terms of this invention, viewing in transmitted light is illuminating a data carrier from one side and viewing the data carrier from another side, in particular the opposite side. An observation in transmitted light is therefore present, for example, when the back of the data carrier is illuminated and the front of the data carrier is viewed. The light thus shines through the data carrier.

The data carrier substrate of the data carrier, eg a value document substrate such as a banknote substrate, is in particular a paper substrate or a paper-like substrate, a polymer substrate, a paper/foil/paper composite substrate or a foil/paper/foil composite substrate. A document of value or security paper provided with a window area can be produced in the case of a paper substrate, a paper/foil/paper composite substrate or a foil/paper/foil composite substrate, for example by means of a continuous gap within the paper layer(s). Alternatively, the paper layer can be made transparent in a certain area by means of a suitable liquid, for example by means of an aqueous sulfuric acid solution. In the case of a document of value based on a transparent polymer substrate Window area can be generated, for example, by means of congruent recesses in the opaque print layers applied to the front and back of the polymer substrate.

According to the invention, in a generic security element, a carrier, i.e. a carrier substrate such as a film, is provided with an embossing lacquer layer with an embossed relief structure and a layer structure that contains opaque, metallic areas, semi-transparent areas that are visible to a viewer when viewed in reflected light and give a different color impression when viewed in transmitted light, and has transparent areas.

The opaque, metallic areas are formed in particular by means of a metallization or reflection layer obtainable, for example, by vapor deposition, preferably by an aluminum layer. In principle, however, other metals such as silver, nickel, copper, iron, chromium or gold can also be used for the metallization. Alternatively, the opaque, metallic areas can be formed by a reflective layer that can be obtained by printing. To produce the reflection layer suitable platelet-shaped metal pigments are from WO 2013/186167 A2 , WO 2010/069823 A1 , WO 2005/051675 A2 (see, for example, the description on page 11, line 10, to page 12, penultimate paragraph) and WO 2011/064162 A2 known. The platelet-shaped metal pigments described therein have the advantage that they adapt so well to a substrate with a relief structure, in particular a relief with microstructures and/or nanostructures, that the difference to a conventional metallization obtainable by vapor deposition is almost no longer discernible. The simple, typographical production of the reflective layer makes it possible to dispense with complex ones Process steps such as printing the carrier with a soluble wash ink in the form of a desired recess within the reflective layer to be produced, producing a metallization by vapor deposition and washing off the wash ink together with the metallization applied above the wash ink.

The layer structure of the security element according to the invention according to a first variant has opaque, metallic areas, semi-transparent areas that give a viewer a different color impression when viewed in reflected light and when viewed in transmitted light, and transparent areas, with both the transparent areas and the opaque, metallic areas are each formed in the form of patterns, characters or coding and the semi-transparent areas represent a background. The layer structure of the security element according to the invention according to a second variant has opaque, metallic areas, semi-transparent areas that give a viewer a different color impression when viewed in reflected light and when viewed in transmitted light, and transparent areas, with both the transparent areas and the semi-transparent areas are each formed in the form of patterns, characters or a code and the opaque metallic areas represent a background. Both variants are based on the general idea of providing a security element in which two separate areas are each formed in the form of patterns, characters or a code, with an area formed in the form of patterns, characters or a code depending on how it is viewed in reflected light or in Transmitted light has a different color impression. According to a preferred embodiment, the one area formed in the form of patterns, characters or a code is initially not perceptible when viewed in reflected light, but only when viewed in transmitted light. In this case, in particular, the color of the semi-transparent areas is identical to the color of the opaque, metallic areas when viewed in reflected light. Information hidden when viewed in incident light, which is only recognizable when viewed in transmitted light, increases the viewer's interest and increases the counterfeit security of the respective object of value.

The semi-transparent areas, which give a viewer a different color impression when viewed in reflected light and when viewed in transmitted light, are based in particular on a multi-layer structure with two semi-transparent metallic layers and a dielectric layer arranged between the two semi-transparent metallic layers. Such a multilayer structure, which appears gold when viewed in reflected light and shows a blue hue when viewed in transmitted light, is, for example, from WO 2011/082761 A1 known.

• die beiden semitransparenten metallischen Schichten werden bevorzugt von Al oder Ag gewählt; die dielektrische Schicht ist insbesondere eine SiO₂-Schicht;
• im Falle, dass jede der beiden semitransparenten metallischen Schichten auf Al beruht, liegt die jeweilige bevorzugte Schichtdicke in einem Bereich von 5 nm bis 20 nm, insbesondere bevorzugt in einem Bereich von 10 nm bis 14 nm; die dielektrische SiO₂-Schicht hat vorzugsweise eine Schichtdicke in einem Bereich von 50 nm bis 450 nm, weiter bevorzugt in einem Bereich von 80 nm bis 260 nm und insbesondere bevorzugt in einem Bereich von 210 nm bis 260 nm, wobei die Bereiche von 80 nm bis 100 nm und von 210 nm bis 240 nm speziell für die Bereitstellung eines Gold/Blau-Farbwechsels besonders bevorzugt werden;
• im Falle, dass jede der beiden semitransparenten metallischen Schichten auf Ag beruht, liegt die jeweilige bevorzugte Schichtdicke in einem Bereich von 15 nm bis 25 nm; die dielektrische SiO₂-Schicht hat vorzugsweise eine Schichtdicke in einem Bereich von 50 nm bis 450 nm, weiter bevorzugt in einem Bereich von 80 nm bis 260 nm und insbesondere bevorzugt in einem Bereich von 210 nm bis 260 nm, wobei die Bereiche von 80 nm bis 100 nm und von 210 nm bis 240 nm speziell für die Bereitstellung eines Gold/Blau-Farbwechsels besonders bevorzugt werden.

Suitable multilayer constructions with two semi-transparent metallic layers and a dielectric layer arranged between the two semi-transparent metallic layers typically have the following physical properties:

• the two semi-transparent metallic layers are preferably chosen from Al or Ag; the dielectric layer is in particular an SiO ₂ layer;
• in the event that each of the two semitransparent metallic layers is based on Al, the respective preferred layer thickness is in a range from 5 nm to 20 nm, particularly preferably in a range from 10 nm to 14 nm; the dielectric SiO ₂ layer preferably has a layer thickness in a range from 50 nm to 450 nm, more preferably in a range of 80 nm to 260 nm and more preferably in a range from 210 nm to 260 nm, with the ranges from 80 nm to 100 nm and from 210 nm to 240 nm being particularly preferred especially for providing a gold/blue color change;
• in the event that each of the two semi-transparent metallic layers is based on Ag, the respective preferred layer thickness is in a range from 15 nm to 25 nm; the dielectric SiO ₂ layer preferably has a layer thickness in a range from 50 nm to 450 nm, more preferably in a range from 80 nm to 260 nm and particularly preferably in a range from 210 nm to 260 nm, the ranges from 80 nm to 100 nm and from 210 nm to 240 nm are particularly preferred especially for providing a gold/blue color change.

• im Auflicht Magenta, im Durchlicht Blau-Grün;
• im Auflicht Türkis, im Durchlicht Orange-Gelb;
• im Auflicht Gold, im Durchlicht Blau-Violett;
• im Auflicht Silber, im Durchlicht Violett.

The multi-layered layer structures mentioned above not only enable the production of a semi-transparent functional layer, which appears gold-colored when viewed in incident light and shows a blue hue when viewed in transmitted light, but depending on the choice of layer thickness, in particular the dielectric layer, further color changes can be generated, e.g

• magenta in reflected light, blue-green in transmitted light;
• turquoise in incident light, orange-yellow in transmitted light;
• reflected light gold, transmitted light blue-violet;
• reflected light silver, transmitted light violet.

The semi-transparent areas, which give a viewer a different color impression when viewed in reflected light and when viewed in transmitted light, can also be obtained by means of an effect pigment composition. Print layers based on an effect pigment composition, which when viewed in reflected light show a different color than when viewed in transmitted light, in particular a gold/blue color change, a gold/violet color change, a green-gold/magenta color change, a violet/green color change or a silver/opaque color change, for example in the WO 2011/064162 A2 described. The pigments preferably have a longest dimension of edge length end-to-end in a range of 15 nm to 1000 nm and are based on a transition metal selected from the group consisting of Cu, Ag, Au , Zn, Cd, Ti, Cr, Mn, Fe, Co, Ni, Ru, Rh, Pd, Os, Ir and Pt. The transition metal is preferably Ag. The aspect ratio (i.e. the ratio of the longest end-to-end dimension to the thickness) is preferably at least 1.5, more preferably in a range from 1.5 to 300. The ratio of binder to metal pigment is preferably below 10: 1, especially below 5:1. Depending on the choice of the aspect ratio of the pigment, its longest end-to-end dimension and the adjustment of the pigment/binder ratio, the color when viewed in transmission and the color when viewed in reflection of the print layer can be adjusted (e.g. blue in transmission and silver, gold, bronze, copper or violet in reflection; also violet, magenta, pink, green or brown in transmission and various colors in reflection depending on the choice of pigment/binder ratio). Colors with gold/blue color change between reflection and transmission (in other words, between reflected light and transmitted light observation) are, for example, in Examples 1, 2 and 3 in Table 1 of WO 2011/064162 A2 called. Furthermore, example 4 shows a gold/violet color change color, example 5 a green-gold/magenta color change color, example 7 a violet/green color change color and example 8 a silver/opaque color change color.

The security element according to the invention can in particular be designed as a so-called laminate film in which the carrier or the carrier substrate is firmly anchored with the embossing lacquer layer. The laminate film, which is present in particular in the form of a patch, a strip or a thread, can then be applied to a value-document substrate together with the carrier. In particular, a window or a recess in the value-document substrate can be closed in this way.

Furthermore, the security element according to the invention can be designed as a so-called transfer film in which the carrier or the carrier substrate is not firmly anchored with the embossing lacquer layer but can be detached from the embossing lacquer layer. The transfer film, which is present in particular in the form of a patch, a strip or a thread, can be applied to a value-document substrate without the carrier substrate of the transfer film remaining on the value-document substrate. Such a procedure is particularly suitable in the case that the value document substrate to be equipped with the security element is a polymer substrate. In this way the layer thickness in the product obtained is not too high.

• eine optionale Farbannahmeschicht bzw. Druckannahmeschicht;
• ein Trägersubstrat, z.B. Polyethylenterephthalat(PET)-Folie;
• eine Prägelackschicht, die insbesondere eine diffraktive Struktur bildende Reliefstruktur und/oder eine Mikrospiegelanordnung bildende Reliefstruktur aufweist;
• die Schicht bzw. die Schichten, die die opaken, metallischen Bereiche einerseits und die semitransparenten Bereiche, die einem Betrachter bei der Betrachtung im Auflicht und bei der Betrachtung im Durchlicht einen unterschiedlichen Farbeindruck vermitteln, bilden; dazwischen sind die transparenten Bereiche angeordnet;
• optional eine Primerschicht;
• eine Klebschicht, z.B. eine Heißsiegelbeschichtung, die für das Verkleben des Sicherheitselements mit dem Datenträgersubstrat geeignet ist.

According to an advantageous variant, the security element according to the invention, in particular when it is present as a laminate film, has the following layers in the following order:

• an optional ink acceptance layer;
• a carrier substrate, eg, polyethylene terephthalate (PET) film;
• an embossing lacquer layer, which has in particular a relief structure forming a diffractive structure and/or a relief structure forming a micromirror arrangement;
• the layer or layers which form the opaque, metallic areas on the one hand and the semi-transparent areas which give a viewer a different color impression when viewed in reflected light and when viewed in transmitted light; the transparent areas are arranged in between;
• optionally a primer layer;
• an adhesive layer, eg a heat-seal coating, which is suitable for gluing the security element to the data carrier substrate.

• eine Klebschicht, z.B. eine Heißsiegelbeschichtung, die für das Verkleben des Sicherheitselements mit dem Datenträgersubstrat geeignet ist;
• eine optionale Primerschicht;
• ein Trägersubstrat, z.B. Polyethylenterephthalat(PET)-Folie;
• eine Prägelackschicht, die insbesondere eine diffraktive Struktur bildende Reliefstruktur und/oder eine Mikrospiegelanordnung bildende Reliefstruktur aufweist;
• die in die Prägelackschicht eingeprägte Reliefstruktur weist die transparenten Bereiche und die semitransparenten Bereiche in zwei separaten Teilbereichen auf und ein Teil der semitransparenten Bereiche ist zusätzlich mit einer mittels Aufdampfen erhältlichen Metallisierung versehen oder ist mit plättchenförmigen Metallpigmenten bedruckt, um auf diese Weise die metallischen, opaken Bereiche zu bilden;
• eine optionale Schutzschicht;
• eine optionale Farbannahmeschicht bzw. Druckannahmeschicht.

According to a further advantageous variant, the security element according to the invention, in particular when it is present as a laminate film, has the following layers in the following order:

• an adhesive layer, eg a heat seal coating, suitable for adhering the security element to the data carrier substrate;
• an optional primer layer;
• a carrier substrate, eg, polyethylene terephthalate (PET) film;
• an embossing lacquer layer, which has in particular a relief structure forming a diffractive structure and/or a relief structure forming a micromirror arrangement;
• The relief structure embossed in the embossing lacquer layer has the transparent areas and the semi-transparent areas in two separate sub-areas and part of the semi-transparent areas is additionally provided with a metallization that can be obtained by vapor deposition or is printed with platelet-shaped metal pigments, in order in this way to create the metallic, opaque areas to build;
• an optional protective layer;
• an optional ink trapping layer or print trapping layer.

The security element according to the invention according to the above, further advantageous variant can in particular be designed in such a way that the semi-transparent areas are based on a multi-layer structure which appears gold-colored when viewed in reflected light and shows a blue hue when viewed in transmitted light, with part of the semi-transparent Areas are additionally provided with a metallization, e.g. obtainable by vapor deposition, or is printed with platelet-shaped metal pigments in order to form silver, metallic, opaque areas in this way.

• eine optionale Farbannahmeschicht bzw. Druckannahmeschicht;
• ein Trägersubstrat, z.B. Polyethylenterephthalat(PET)-Folie;
• eine Prägelackschicht, die insbesondere eine diffraktive Struktur bildende Reliefstruktur und/oder eine Mikrospiegelanordnung bildende Reliefstruktur aufweist;
• die Schicht bzw. die Schichten, die die opaken, metallischen Bereiche einerseits und die semitransparenten Bereiche, die einem Betrachter bei der Betrachtung im Auflicht und bei der Betrachtung im Durchlicht einen unterschiedlichen Farbeindruck vermitteln, bilden; dazwischen sind die transparenten Bereiche angeordnet;
• eine optionale Primerschicht;
• eine Klebschicht, z.B. eine Heißsiegelbeschichtung, die für das Verkleben des Sicherheitselements mit dem Datenträgersubstrat geeignet ist.

According to an advantageous variant, the security element according to the invention, in particular when it is present as a transfer film, has the following layers in the following order:

• an optional ink acceptance layer;
• a carrier substrate, eg, polyethylene terephthalate (PET) film;
• an embossing lacquer layer, which has in particular a relief structure forming a diffractive structure and/or a relief structure forming a micromirror arrangement;
• the layer or layers which form the opaque, metallic areas on the one hand and the semi-transparent areas which give a viewer a different color impression when viewed in reflected light and when viewed in transmitted light; the transparent areas are arranged in between;
• an optional primer layer;
• an adhesive layer, eg a heat-seal coating, which is suitable for gluing the security element to the data carrier substrate.

In the above variant, the embossing lacquer layer has only weak adhesion to the carrier substrate if a transfer film is present This can be achieved, for example, by poor adhesion of the embossing lacquer to the carrier substrate or by introducing a special separating layer.

• den Schritt des Bereitstellens eines Trägersubstrats mit einer darauf aufgebrachten Prägelackschicht;
• den Schritt des Aufdruckens einer löslichen Waschfarbe in den Bereichen außerhalb der zu erzeugenden metallischen, opaken Bereiche;
• den Schritt des Aufbringens einer Metallisierung, z.B. eine reflektierende Al-, Cr-, Cu- oder Au-Schicht, insbesondere mittels Aufdampfen, wobei eine Al-Schicht bevorzugt wird;
• den Schritt des Abwaschens der löslichen Waschfarbe zusammen mit der oberhalb der Waschfarbe befindlichen Metallisierung mittels eines Lösungsmittels, sodass metallische, opake Bereiche auf der Prägelackschicht zurückbleiben;
• den Schritt des Aufdruckens einer löslichen Waschfarbe in den Bereichen außerhalb der zu erzeugenden semitransparenten Bereiche;
• den Schritt des Erzeugens eines mehrschichtigen Aufbaus mit zwei semitransparenten metallischen Schichten und einer zwischen den zwei semitransparenten metallischen Schichten angeordneten dielektrischen Schicht, insbesondere mittels Aufdampfen;
• den Schritt des Abwaschens der löslichen Waschfarbe zusammen mit der oberhalb der Waschfarbe befindlichen mehrschichtigen Aufbaus, sodass außer den metallischen, opaken Bereichen auch semitransparente Bereiche auf der Prägelackschicht zurückbleiben und zwischen den metallischen, opaken Bereichen und den semitransparenten Bereichen transparente Bereiche gebildet sind;
• optional den Schritt des Aufbringens einer optionalen Primerschicht; und
• optional den Schritt des Aufbringens einer Klebschicht, z.B. eine Heißsiegellackschicht.

The invention also relates to a method for producing the security element according to the invention for protecting documents of value with a carrier, a layer structure arranged on the carrier via an embossing lacquer layer and an adhesive layer suitable for gluing the security element to an object of value, the layer structure comprising opaque, metallic areas, semi-transparent areas that give a viewer a different color impression when viewed in reflected light and when viewed in transmitted light, and has transparent areas, the method comprising the following steps:

• the step of providing a carrier substrate with an embossing lacquer layer applied thereto;
• the step of printing a soluble wash ink in the areas outside of the metallic opaque areas to be created;
• the step of applying a metallization, eg a reflective Al, Cr, Cu or Au layer, in particular by means of vapor deposition, with an Al layer being preferred;
• the step of washing off the soluble wash ink together with the metallization located above the wash ink using a solvent so that metallic, opaque areas remain on the embossing lacquer layer;
• the step of printing a soluble wash ink in the areas outside of the semi-transparent areas to be created;
• the step of creating a multi-layer structure with two semi-transparent metallic layers and one between the two semitransparent metallic layers arranged dielectric layer, in particular by means of vapor deposition;
• the step of washing off the soluble washing ink together with the multilayer structure located above the washing ink, so that in addition to the metallic, opaque areas, semitransparent areas also remain on the embossing lacquer layer and transparent areas are formed between the metallic, opaque areas and the semitransparent areas;
• optionally the step of applying an optional primer layer; and
• optionally the step of applying an adhesive layer, eg a heat-seal lacquer layer.

• den Schritt des Bereitstellens eines Trägersubstrats mit einer darauf aufgebrachten Prägelackschicht;
• den Schritt des drucktechnischen Erzeugens metallischer, opaker Bereiche auf der Prägelackschicht mittels einer auf plättchenförmigen Metallpigmenten beruhenden Druckfarbe;
• den Schritt des Aufdruckens einer löslichen Waschfarbe in den Bereichen außerhalb der zu erzeugenden semitransparenten Bereiche;
• den Schritt des Erzeugens eines mehrschichtigen Aufbaus mit zwei semitransparenten metallischen Schichten und einer zwischen den zwei semitransparenten metallischen Schichten angeordneten dielektrischen Schicht, insbesondere mittels Aufdampfen;
• den Schritt des Abwaschens der löslichen Waschfarbe zusammen mit der oberhalb der Waschfarbe befindlichen mehrschichtigen Aufbaus, sodass außer den metallischen, opaken Bereichen auch semitransparente Bereiche auf der Prägelackschicht zurückbleiben und zwischen den metallischen, opaken Bereichen und den semitransparenten Bereichen transparente Bereiche gebildet sind;
• optional den Schritt des Aufbringens einer optionalen Primerschicht; und
• optional den Schritt des Aufbringens einer Klebschicht, z.B. eine Heißsiegellackschicht.

Another method for producing the security element according to the invention for protecting documents of value with a carrier, a layer structure arranged on the carrier via an embossing lacquer layer and an adhesive layer suitable for gluing the security element to an object of value, the layer structure comprising opaque, metallic areas, semi-transparent areas, the convey a different color impression to an observer when viewed in reflected light and when viewed in transmitted light, and has transparent areas, comprises the following steps:

• the step of providing a carrier substrate with an embossing lacquer layer applied thereto;
• the step of producing metallic, opaque areas on the embossing lacquer layer by printing by means of a printing ink based on platelet-shaped metal pigments;
• the step of printing a soluble wash ink in the areas outside of the semi-transparent areas to be created;
• the step of producing a multilayer structure with two semitransparent metallic layers and a dielectric layer arranged between the two semitransparent metallic layers, in particular by means of vapor deposition;
• the step of washing off the soluble washing ink together with the multilayer structure located above the washing ink, so that in addition to the metallic, opaque areas, semitransparent areas also remain on the embossing lacquer layer and transparent areas are formed between the metallic, opaque areas and the semitransparent areas;
• optionally the step of applying an optional primer layer; and
• optionally the step of applying an adhesive layer, eg a heat-seal lacquer layer.

• den Schritt des Bereitstellens eines Trägersubstrats mit einer darauf aufgebrachten Prägelackschicht;
• den Schritt des Aufdruckens einer löslichen Waschfarbe in den Bereichen außerhalb zu erzeugender semitransparenter Bereiche;
• den Schritt des Erzeugens eines mehrschichtigen Aufbaus mit zwei semitransparenten metallischen Schichten und einer zwischen den zwei semitransparenten metallischen Schichten angeordneten dielektrischen Schicht, insbesondere mittels Aufdampfen;

• den Schritt des Abwaschens der löslichen Waschfarbe zusammen mit der oberhalb der Waschfarbe befindlichen mehrschichtigen Aufbaus, sodass semitransparente Bereiche auf der Prägelackschicht zurückbleiben;
• den Schritt des Aufdruckens einer löslichen Waschfarbe in den Bereichen außerhalb zu erzeugenden metallischen, opaken Bereiche;
• den Schritt des Aufbringens einer Metallisierung, z.B. eine reflektierende Al-, Cr-, Cu- oder Au-Schicht, mittels Aufdampfen, wobei eine Al-Schicht bevorzugt wird, wobei der Schritt so erfolgt, dass ein Teil der semitransparenten Bereiche zusätzlich mit einer mittels Aufdampfen erhältlichen Metallisierung versehen ist, um auf diese Weise die metallischen, opaken Bereiche zu bilden;
• den Schritt des Abwaschens der löslichen Waschfarbe zusammen mit der oberhalb der Waschfarbe befindlichen Metallisierung;
• optional den Schritt des Aufbringens einer optionalen Primerschicht; und
• optional den Schritt des Aufbringens einer Klebschicht, z.B. eine Heißsiegellackschicht.

Another method for producing the security element according to the invention for protecting documents of value with a carrier, a layer structure arranged on the carrier via an embossing lacquer layer and an adhesive layer suitable for gluing the security element to an object of value, the layer structure comprising opaque, metallic areas, semi-transparent areas, the convey a different color impression to an observer when viewed in reflected light and when viewed in transmitted light, and has transparent areas, comprises the following steps:

• the step of providing a carrier substrate with an embossing lacquer layer applied thereto;
• the step of printing a soluble wash ink in the areas outside semitransparent areas to be formed;
• the step of creating a multi-layer structure with two semi-transparent metallic layers and one between the two semitransparent metallic layers arranged dielectric layer, in particular by means of vapor deposition;

• the step of washing off the soluble wash ink together with the multi-layer structure located above the wash ink so that semi-transparent areas remain on the embossing varnish layer;
• the step of printing a soluble wash ink in the areas outside of metallic opaque areas to be formed;
• the step of applying a metallization, eg a reflective Al, Cr, Cu or Au layer, by means of vapor deposition, an Al layer being preferred, the step being carried out in such a way that part of the semi-transparent areas are additionally covered with a means metallization obtainable by vapor deposition so as to form the metallic opaque areas;
• the step of washing off the soluble wash ink along with the metallization located above the wash ink;
• optionally the step of applying an optional primer layer; and
• optionally the step of applying an adhesive layer, eg a heat-seal lacquer layer.

The security element according to the invention can additionally be equipped with magnetic and/or fluorescent security features.

The invention further relates to a data carrier with a security element of the type described above. The data carrier can be a document of value, such as a banknote, in particular a paper banknote, a polymer banknote or a foil composite banknote, a share, a bond, a certificate, a voucher , a cheque, a high-value ticket, but also an identity card, such as a credit card, a bank card, a cash card, a Trade an authorization card, an ID card or a passport personalization page.

Further exemplary embodiments and advantages of the invention are explained below with reference to the figures, which are not shown to scale and proportions in order to improve clarity.

Figur 1

eine schematische Darstellung einer Banknote mit einem erfindungsgemäßen Sicherheitselement;

Figur 2

ein erfindungsgemäßes Sicherheitselement gemäß einem ersten Ausführungsbeispiel in Draufsicht;

Figur 3

einen Ausschnitt des erfindungsgemäßen Sicherheitselements gemäß dem ersten Ausführungsbeispiel in Querschnittansicht;

Figur 4

einen Ausschnitt eines erfindungsgemäßen Sicherheitselements gemäß einem zweiten Ausführungsbeispiel in Querschnittansicht;

Figur 5

einen Ausschnitt eines erfindungsgemäßen Sicherheitselements gemäß einem dritten Ausführungsbeispiel in Querschnittansicht;

Figur 6

ein erfindungsgemäßes Sicherheitselement gemäß einem vierten Ausführungsbeispiel in Draufsicht;

Figur 7

eine schematische Darstellung einer Banknote mit einem erfindungsgemäßen Sicherheitselement in Form eines Sicherheitsfadens;

Figur 8

ein erfindungsgemäßes Sicherheitselement gemäß einem fünften Ausführungsbeispiel in Draufsicht;

Figur 9

einen Ausschnitt des erfindungsgemäßen Sicherheitselements gemäß dem fünften Ausführungsbeispiel in Querschnittansicht;

Figur 10

ein erfindungsgemäßes Sicherheitselement gemäß einem sechsten Ausführungsbeispiel in Draufsicht;

Figur 11

ein erfindungsgemäßes Sicherheitselement gemäß einem siebten Ausführungsbeispiel bei der Betrachtung im Auflicht; und

Figur 12

das erfindungsgemäße Sicherheitselement gemäß dem siebten Ausführungsbeispiel bei der Betrachtung im Auflicht.

Show it:

figure 1

a schematic representation of a bank note with a security element according to the invention;

figure 2

a security element according to the invention according to a first embodiment in plan view;

figure 3

a detail of the security element according to the invention according to the first embodiment in cross-sectional view;

figure 4

a detail of a security element according to the invention according to a second embodiment in cross-sectional view;

figure 5

a detail of a security element according to the invention according to a third embodiment in cross-sectional view;

figure 6

a security element according to the invention according to a fourth embodiment in plan view;

figure 7

a schematic representation of a bank note with a security element according to the invention in the form of a security thread;

figure 8

a security element according to the invention according to a fifth embodiment in plan view;

figure 9

a detail of the security element according to the invention according to the fifth embodiment in cross-sectional view;

figure 10

a security element according to the invention according to a sixth embodiment in plan view;

figure 11

a security element according to the invention according to a seventh embodiment when viewed in reflected light; and

figure 12

the security element according to the invention according to the seventh exemplary embodiment when viewed in reflected light.

The invention will now be explained using the example of security elements for banknotes. figure 1 shows a schematic representation of a banknote 1 with a transparent window area 3 (dashed shown), which is provided with a security element 2 according to the invention in the form of a patch. The bank note 1 is based on a paper substrate which has a continuous gap in area 3 . The continuous gap is covered on at least one side of the paper substrate by the security element according to the invention, which is present as a laminate film. On the side of the paper substrate opposite the security element, the paper substrate can optionally be provided with an additional transparent film. The additional transparent film can, for example, cover at least the area of the continuous recess. The one in the figure 1 The banknote shown has the denomination "20" produced by printing in the lower left area.

The figure 2 shows a security element 2 according to the invention according to a first embodiment in plan view. The security element 2 is semi-transparent in the shaded area, the viewer perceives this area when viewed in incident light in the form of a gold-colored metallization, when viewed in transmitted light the viewer perceives this area in a blue hue. In the black area (see the number "2"), the security element 2 is opaque, metallic, both when viewed in reflected light and when viewed in transmitted light. The security element 2 is transparent in the white area (see the number "0").

• 5 bis 15 nm Al / 85 bis 250 nm SiO₂ / 5 bis 15 nm Al, insbesondere
• 5 bis 15 nm Al / 85 bis 125 nm SiO₂ / 5 bis 15 nm Al; oder
• 15 bis 25 nm Ag / 80 bis 105 nm SiO₂ / 15 bis 25 nm Ag;

The figure 3 shows a detail of the security element 2 according to the invention according to the first embodiment in a cross-sectional view. The carrier 4 in the form of a transparent plastic film, for example a PET film, has an embossing lacquer 5 . The relief structure (ie the surface) of the embossing varnish 5 contains a microstructure, for example. Above the embossing varnish 5 are on the left and on the On the right-hand side semi-transparent thin-film elements are present, which give a viewer a different color impression when viewed in reflected light and when viewed in transmitted light; in the present case these are thin-film elements, each of which has two semi-transparent mirror layers (with the reference numbers 6 and 8) and one between the two Have mirror layers arranged dielectric spacer layer 7. Such a thin-film element, which appears gold in reflected light and blue in transmitted light, is in WO 2011/082761 A1 described. As mentioned earlier in the description, exemplary layer arrangements are:

• 5 to 15 nm Al / 85 to 250 nm SiO ₂ / 5 to 15 nm Al, in particular
• 5 to 15 nm Al / 85 to 125 nm SiO ₂ / 5 to 15 nm Al; or
• 15 to 25 nm Ag / 80 to 105 nm SiO ₂ / 15 to 25 nm Ag;

The semi-transparent areas are in the figure 3 with the letter "A" and form the in the figure 2 shaded background surrounding the number "20".

The central area of the embossing varnish 6 is provided with an opaque, reflective Al layer. The opaque, metallic area is in the figure 3 provided with the letter "C" and forms the in the figure 2 shown digit "2".

The transparent areas are in the figure 3 denoted by the letter "B" and form the in the figure 2 shown digit "0".

That in the figure 3 The security element shown in the form of a laminate film is applied to the paper substrate of the banknote 1 by means of an adhesive layer 11, in particular a heat-sealing lacquer layer, so that the cutout 3 of the bank note is closed on one side by the security element and the viewer can perceive the optical reflected and transmitted light effects particularly well in the window area of the bank note. The adhesive layer 11 can optionally be arranged over an optional primer layer 10 .

Depending on the design of the microstructure of the embossing lacquer layer 5, the security element shows, for example, interesting three-dimensional warping effects in the areas “A” and/or “B”. The figure 5 shows a detail of a security element according to the invention according to a third embodiment, which is based on the first embodiment according to FIG figure 3 is ajar, in cross-sectional view. In the figure 5 the micro- or nanostructure of the embossing lacquer layer 5 and the semi-transparent thin-film elements (with the layers 6, 7 and 8) that adapt to the relief of the embossing lacquer layer 5 on the one hand and the opaque, metallic Al layer 9 on the other hand are highlighted in the drawing.

The figure 4 shows a detail of a security element according to the invention according to a second embodiment in a cross-sectional view. That in the figure 4 The security element shown is also like that in the Figures 3 and 5 shown security elements in the form of a laminate film and is suitable for covering the recess 3 in the figure 1 shown banknote 1. The in the figure 4 The security element shown contains a carrier 4 in the form of a transparent plastic film, for example a PET film. Above the carrier 4 there is an embossing lacquer 5 which is provided with a relief structure in the form of a microstructure or nanostructure. Above the embossing lacquer 5, semi-transparent thin-film elements are present on the left side, on the right side and in the central area, which a viewer can see when viewing give a different color impression in incident light and when viewed in transmitted light, in the present case these are thin-film elements which each have two semi-transparent mirror layers (with the reference numbers 6 and 8) and a dielectric spacer layer 7 arranged between the two mirror layers. Such a thin-film element appears gold in reflected light and blue in transmitted light. Certain areas of the left and right semi-transparent thin-film elements additionally have a reflective Al layer 12 and in this way form opaque, metallic areas. The semi-transparent thin-film elements (each containing the layers 6, 7 and 8) and the opaque, metallic layer 12 are covered by the protective lacquer 10. If necessary, an ink acceptance layer or print acceptance layer (not shown in the figure) can be arranged above the protective lacquer 10 so that the security element can also be printed with ink.

That in the figure 4 The security element shown in the form of a laminate film is applied to the paper substrate of banknote 1 by means of an adhesive layer 11, in particular a heat-seal lacquer layer, so that recess 3 in the banknote is closed on one side by the security element and the viewer in the window area of the banknote can see the optical reflected light and can perceive transmitted light effects particularly well.

That in the figure 4 The security element shown appears metallic and opaque (eg silver) to the observer in the areas "C" and gold-colored in the semi-transparent areas "A" when viewed in reflected light and in a blue hue when viewed in transmitted light. The "B" areas represent the transparent areas.

The figure 6 shows a security element according to the invention according to a fourth embodiment in plan view. The fourth embodiment is in connection with the Figures 1 to 4 described embodiment based. Unlike the one in the figure 2 security element shown takes the viewer in the case of figure 6 the numeral "2" is golden when viewed in reflected light and true in blue when viewed in transmitted light, ie, the numeral "2" is formed in the shape of a semitransparent region, eg, by means of a semitransparent Al/SiO ₂ /Al thin film element. The digit "0" is formed in the shape of a transparent area. The background surrounding the digits "2" and "0" is in the form of an opaque, metallic surface, in the example in the form of a reflective Al layer.

The figure 7 shows a schematic representation of a bank note 13 with a security element 14 according to the invention in the form of a security thread or security strip. Banknote 13 is a plastic banknote and is based on a polymer substrate. The security element 14 was formed in the form of a transfer foil (ie with a detachable carrier substrate) before being applied to the polymer substrate of the bank note 13 .

The figure 8 shows the section of a security element 14 according to the invention according to a fifth exemplary embodiment in plan view. The security element 14 is semi-transparent in the shaded area, the viewer perceives this area when viewed in incident light in the form of a gold-colored metallization, when viewed in transmitted light the viewer perceives this area in a blue hue. In the black area (see the left and right black numbers "20"), the security element 14 is opaque, metallic, both when viewed in reflected light and when viewed in transmitted light. In the white area (see the middle white number "20"), the security element 2 is transparent.

• 5 bis 15 nm Al / 85 bis 250 nm SiO₂ / 5 bis 15 nm Al, insbesondere
• 5 bis 15 nm Al / 85 bis 125 nm SiO₂ / 5 bis 15 nm Al; oder
• 15 bis 25 nm Ag / 80 bis 105 nm SiO₂ / 15 bis 25 nm Ag;

The figure 9 shows a detail of the security element 14 according to the invention according to the fifth exemplary embodiment in a cross-sectional view. The carrier 4 in the form of a transparent plastic film, for example a PET film, has an embossing lacquer 5 . The relief structure (ie the surface) of the embossing varnish 5 contains a microstructure, for example. Above the embossing varnish 5, there are semi-transparent thin-film elements on the left and on the right side, which give a viewer a different color impression when viewed in reflected light and when viewed in transmitted light; in the present case, these are thin-film elements, each of which has two semi-transparent mirror layers (with reference numerals 6 and 8) and a dielectric spacer layer 7 disposed between the two mirror layers. Such a thin-film element, which appears gold in reflected light and blue in transmitted light, is in WO 2011/082761 A1 described. As mentioned earlier in the description, exemplary layer arrangements are:

• 5 to 15 nm Al / 85 to 250 nm SiO ₂ / 5 to 15 nm Al, in particular
• 5 to 15 nm Al / 85 to 125 nm SiO ₂ / 5 to 15 nm Al; or
• 15 to 25 nm Ag / 80 to 105 nm SiO ₂ / 15 to 25 nm Ag;

The semi-transparent areas are in the figure 9 with the letter "A" and form the in the figure 8 shaded background surrounding the numbers "20".

The central area of the embossing varnish 6 is provided with an opaque, reflective Al layer. The opaque, metallic area is in the figure 9 provided with the letter "C" and forms the in the figure 8 black numbers "20" shown left and right.

The transparent areas are in the figure 9 denoted by the letter "B" and form the in the figure 8 shown middle white number "20".

That in the figure 9 The security element shown in the form of a transfer film is applied to the polymer substrate of the banknote 13 by means of an adhesive layer 11, in particular a heat-sealing lacquer layer. After application to the polymer substrate, the temporary carrier 4 is detached from the security element applied to the bank note. In this way, the layer thickness of the bank note 14 in the area of the security element 14 is not too high.

The figure 10 shows a security element according to the invention according to a sixth embodiment in plan view. The sixth embodiment is in connection with the Figures 7 to 9 described embodiment based. Unlike the one in the figure 8 security element shown takes the viewer in the case of figure 10 the hatched numbers "20" shown on the left and right are gold-colored when viewed in reflected light and blue when viewed in transmitted light, ie the hatched numbers "20" are each formed in the shape of a semi-transparent area, e.g. by means of a semi-transparent Al/SiO ₂ /Al thin film element. The middle white number "20" is formed in the shape of a transparent area. The background surrounding the numbers "20" is in the form of an opaque, metallic surface, in the example in the form of a reflective Al layer.

In the case of in the figures 8 and 10 With the security threads shown, the viewer can see all the numbers "20" both when viewed in reflected light and when viewed in transmitted light. The Figures 11 and 12 describe a seventh embodiment in connection with the Figures 7 to 9 is based on the exemplary embodiment described, in which the viewer sees the numbers "20" shown on the left and right, but not when viewing in reflected light (see figure 11 ), but only when viewed in transmitted light (see the figure 12 ) can recognize.

In the case of the seventh embodiment is also in the figure 9 The layer structure shown is used, with the central region of the embossing lacquer 5 not being provided with an opaque, reflective, silver Al layer, but with an opaque, reflective, gold-colored layer (eg an Au layer or a Cu layer). This opaque, metallic, gold-colored area forms in the Figures 11 and 12 the black background. The numbers "20" shown on the left and right are each based on a semi-transparent thin film which is gold-colored when viewed in incident light and bluish when viewed in transmitted light. Therefore, the viewer can see the two numbers "20" shown on the left and right when viewing in reflected light (see the figure 11 ) not perceive, but only when viewed in transmitted light (see the figure 12 ).

The in the Figures 11 and 12 The middle number "20" shown is in the form of a transparent area (see the area "B" in Fig figure 9 ) educated.

In an alternative variant to the seventh embodiment described above, for the opaque, metallic, reflective layer (see reference number 9 in figure 9 ) a silver Al layer are used and for the semi-transparent thin film (see layers 6, 7 and 8 in the figure 9 ) an Al/SiO ₂ /Al layer structure or an Al/SiO ₂ /Al layer structure which is silver when viewed in reflected light and violet when viewed in transmitted light.

Basically, the in the figure 5 shown relief structure of the embossing lacquer layer 5 also exist in all other exemplary embodiments in which Figures 3 , 4 and 9 the relief was omitted for the sake of simplicity.

Claims (21)

Security element for protecting documents of value with a carrier, a layer structure arranged on the carrier via an embossing lacquer layer and an adhesive layer suitable for gluing the security element to an object of value, the layer structure having opaque, metallic areas, semi-transparent areas that an observer has when viewing in reflected light and convey a different color impression when viewed in transmitted light, and has transparent areas, with both the transparent areas and the semi-transparent areas each being formed in the form of patterns, characters or a code and the opaque, metallic areas representing a background. The security element according to claim 1, wherein the opaque, metallic areas are based on a metallization obtainable by means of vapor deposition or are obtainable by printing and are based on platelet-shaped metal pigments. The security element according to one of claims 1 or 2, wherein the semi-transparent areas, which give a viewer a different color impression when viewed in reflected light and when viewed in transmitted light, are based on a thin-film element having two semi-transparent mirror layers and a dielectric spacer layer arranged between the two mirror layers . The security element according to one of claims 1 or 2, wherein the semi-transparent areas which an observer sees in reflected light and when seen in transmitted light have a different Convey color impression, are available in printing by means of an effect pigment composition. The security element according to any one of claims 1 to 4, wherein the embossing lacquer layer is provided with an embossed relief structure and the relief structure is in particular a diffractive structure, such as a hologram, a holographic grating image or a hologram-like diffraction structure, or an achromatic structure, such as a matt structure, or a micromirror array or a blazed grating with a sawtooth-like groove profile or a Fresnel lens array or a combination of two or more of the above elements. The security element according to any one of claims 1 to 5, wherein the embossing lacquer layer with an embossed relief structure in the areas formed in the form of patterns, characters or a code, namely the transparent areas on the one hand and the opaque, metallic areas on the other hand or the transparent areas on the one hand and the semitransparent areas on the other hand, is formed with two different relief structures, in particular in such a way that a relief structure forms a diffractive structure and the second relief structure forms a micromirror arrangement. The security element according to claim 6, wherein the embossing lacquer layer with an embossed relief structure has a third relief structure in the areas representing a background. The security element according to any one of claims 1 to 5, wherein the embossing lacquer layer with an embossed relief structure in the respective in Areas formed in the form of patterns, characters or a code have the same relief structure and have a further relief structure in the areas representing a background, in particular such that one relief structure forms a diffractive structure and the second relief structure forms a micromirror arrangement. The security element according to any one of claims 1 to 8, wherein the areas formed in the form of patterns, characters or a code are arranged at least partially in register with one another. The security element according to any one of claims 1 to 9, wherein (i) the color impression of the semitransparent areas when viewed in reflected light is identical to the color impression of the opaque, metallic areas and the color impression of the semitransparent areas when viewed in transmitted light is identical to the color impression of the opaque, metallic areas Areas is different, or (ii) both the color impression of the semi-transparent areas when viewed in reflected light and the color impression of the semi-transparent areas when viewed in transmitted light is different from the color impression of the opaque, metallic areas. The security element according to any one of claims 1 to 10, wherein the relief structure embossed into the embossing lacquer layer has the transparent areas, the metallic, opaque areas and the semi-transparent areas in three separate partial areas. The security element according to any one of claims 1 to 10, wherein the relief structure embossed into the embossing lacquer layer has the transparent areas and the semi-transparent areas in two separate partial areas and part of the semi-transparent areas is additionally provided with a metallization obtainable by vapor deposition or is printed with platelet-shaped metal pigments in order in this way to form the metallic, opaque areas. The security element according to any one of claims 1 to 12, wherein the layer sequence of the security element is the following: a) carrier; b) embossing lacquer layer with an embossed relief structure; c) layer structure which has opaque, metallic areas, semi-transparent areas which give an observer a different color impression when viewed in reflected light and when viewed in transmitted light, and transparent areas; d) adhesive layer suitable for gluing the security element to an object of value. The security element according to any one of claims 1 to 12, wherein the layer sequence of the security element is the following: a) adhesive layer suitable for gluing the security element to an object of value; b) carrier; c) Embossed lacquer layer with an embossed relief structure; d) layer structure which has opaque, metallic areas, semi-transparent areas which give an observer a different color impression when viewed in incident light and when viewed in transmitted light, and transparent areas; e) protective layer, in particular protective layer based on a protective lacquer. The security element according to any one of claims 1 to 14, wherein the security element is a security band, a security strip, a patch or a label for application to security paper, a document of value or the like. Data carrier with a security element according to one of Claims 1 to 15. Data carrier according to claim 16, wherein the security element is arranged in a transparent window area of the data carrier. Data carrier according to claim 16 or 17, wherein the data carrier is a document of value, such as a banknote, in particular a paper banknote, polymer banknote or foil composite banknote, or identity card. Method for producing a security element for protecting documents of value, in particular a security element according to one of Claims 1 to 15, with a carrier, a layer structure arranged on the carrier via an embossing lacquer layer and an adhesive layer suitable for gluing the security element to an object of value, the layer structure opaque, metallic areas, semi-transparent areas that give a viewer a different color impression when viewed in incident light and when viewed in transmitted light, and has transparent areas, the method comprising the following steps: - The step of providing a carrier substrate with an embossing lacquer layer applied thereto; - the step of printing a soluble wash ink in the areas outside the metallic, opaque areas to be produced; - the step of applying a metallization, for example a reflective Al, Cr, Cu or Au layer, in particular by means of vapor deposition, an Al layer being preferred; - the step of washing off the soluble wash ink together with the metallization located above the wash ink by means of a solvent, so that metallic, opaque areas remain on the embossing lacquer layer; - the step of printing a soluble wash ink in the areas outside the semi-transparent areas to be produced; - the step of producing a multi-layer structure with two semi-transparent metallic layers and a dielectric layer arranged between the two semi-transparent metallic layers, in particular by means of vapor deposition; - The step of washing off the soluble wash ink together with the multi-layer structure located above the wash ink, so that in addition to the metallic, opaque areas, semitransparent areas also remain on the embossing lacquer layer and transparent areas are formed between the metallic, opaque areas and the semitransparent areas; - optionally the step of applying an optional primer layer; and - optionally the step of applying an adhesive layer, eg a layer of heat-sealing lacquer. Method for producing a security element for protecting documents of value, in particular a security element according to one of Claims 1 to 15, with a carrier, a layer structure arranged on the carrier via an embossing lacquer layer and an adhesive layer suitable for gluing the security element to an object of value, the layer structure opaque, metallic areas, semi-transparent Areas that give an observer a different color impression when viewed in incident light and when viewed in transmitted light, and has transparent areas, comprising the following steps: - The step of providing a carrier substrate with an embossing lacquer layer applied thereto; - The step of typographically producing metallic, opaque areas on the embossing lacquer layer by means of a printing ink based on platelet-shaped metal pigments; - the step of printing a soluble wash ink in the areas outside the semi-transparent areas to be produced; - the step of producing a multi-layer structure with two semi-transparent metallic layers and a dielectric layer arranged between the two semi-transparent metallic layers, in particular by means of vapor deposition; - The step of washing off the soluble wash ink together with the multi-layer structure located above the wash ink, so that in addition to the metallic, opaque areas, semitransparent areas also remain on the embossing lacquer layer and transparent areas are formed between the metallic, opaque areas and the semitransparent areas; - optionally the step of applying an optional primer layer; and - optionally the step of applying an adhesive layer, eg a layer of heat-sealing lacquer. Method for producing a security element for protecting documents of value, in particular a security element according to one of Claims 1 to 15, with a carrier, a layer structure arranged on the carrier via an embossing lacquer layer and an adhesive layer suitable for gluing the security element to an object of value, wherein the layer structure has opaque, metallic areas, semi-transparent areas that give an observer a different color impression when viewed in reflected light and when viewed in transmitted light, and transparent areas, comprises the following steps: - The step of providing a carrier substrate with an embossing lacquer layer applied thereto; - the step of printing a soluble wash ink in the areas outside of semi-transparent areas to be produced; - the step of producing a multi-layer structure with two semi-transparent metallic layers and a dielectric layer arranged between the two semi-transparent metallic layers, in particular by means of vapor deposition; - the step of washing off the soluble wash ink together with the multi-layer structure located above the wash ink, leaving semi-transparent areas on the embossing lacquer layer; - the step of printing a soluble wash ink in the areas outside metallic opaque areas to be created; - The step of applying a metallization, for example a reflective Al, Cr, Cu or Au layer, by vapor deposition, with an Al layer being preferred, the step being carried out in such a way that a part of the semi-transparent areas is additionally covered with a metallization obtainable by vapor deposition so as to form the metallic opaque areas; - the step of washing away the soluble wash ink along with the metallization located above the wash ink; - optionally the step of applying an optional primer layer; and - optionally the step of applying an adhesive layer, eg a layer of heat-sealing lacquer.

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