DE102015008971A1 - Security element and disk - Google Patents

Abstract

The invention relates to a security element for securing a value document or a security paper, wherein the security element has a layer structure with the following layer sequence: a) a first film substrate; b) a first embossing lacquer layer; c) a first semitransparent functional layer; d) a printing layer applied to the first semitransparent functional layer; e) an adhesive layer; f) a second semitransparent functional layer; g) a second embossing lacquer layer; h) optionally a second film substrate; wherein - the first semitransparent functional layer c) forms a first motif recognizable when viewed in front of the security element front side; - The semitransparent second functional layer f) forms a recognizable when viewing the security element back in incident light second motif; - The applied on the first semitransparent functional layer printing layer d) forms a hidden third motif, which is recognizable when viewing the security element in transmitted light both from the front, as well as from the back.

Description

The invention relates to a security element for securing a value document or a security paper. The invention further relates to a data carrier, in particular a value document or a security paper, which is equipped with the security element.

Data carriers, in particular value documents or security papers, are usually provided with security elements for security purposes, which permit verification of the authenticity of the data carrier and at the same time serve as protection against unauthorized reproduction of the data carrier. As security elements come z. B. film security elements into consideration, which have a film substrate or plastic substrate and are applied by means of an adhesive layer on the disk.

To increase the security against counterfeiting, it is known to combine such film security elements with window areas in the value documents. A window area can, for. B. be formed by means of a continuous recess in a (paper) substrate of a value document. In the case of a value document based on a transparent polymer substrate, a window area may be z. B. by means of congruent recesses in the applied on the front and back of the polymer substrate opaque print layers are generated.

The WO 95/10420 A1 describes a document of value in which the carrier is provided with a window-like opening, which is closed with an at least partially transparent cover film, wherein the cover, in particular in the region of the window-like opening with additional security features, such as diffraction structures, can be provided.

The WO 2005/025891 A2 describes a data carrier with a foil security element, wherein both the foil security element and the data carrier have a breakthrough area; the aperture areas preferably overlap at least partially, and more preferably they are congruent. In a further variant, the perforation region in the data carrier is covered by another side facing away from the side of the data carrier carrying the film security element.

The WO 2010/000432 A1 describes a document of value with an opening which is closed on one side with a translucent film. To increase the security against counterfeiting, both the upper side and the lower side of the document of value are covered with a translucent coating, which is preferably made over the entire surface. Preferably, the coatings are each independently extruded or laminated.

The WO 2011/015622 A1 describes a document of value having an opening which is closed on one side with an at least partially translucent or transparent film, wherein on the opposite side of the film of the document of value in the region of the opening and substantially in the region of the film surface is a coating, wherein the coating within the Opening does not exist or essentially does not exist.

The WO 2014/108329 A1 describes a method for producing an endless paper web for the production of security and value documents. The paper web is first provided with a through opening. Subsequently, register-accurate application of a film with applied to the paper web security features.

Based on this, the object of the present invention is to provide a security element by means of which the protection of a data carrier equipped with the same against counterfeiting can be further increased. Another object is to provide a data carrier equipped with the security element.

This object is achieved by the feature combinations defined in the independent claims. Further developments of the invention are the subject of the dependent claims.

Summary of the invention

• 1. (First aspect of the invention) Security element for securing a value document or a security paper, wherein the security element has a layer structure with the following layer sequence: a) a first film substrate; b) a first embossing lacquer layer; c) a first semitransparent functional layer; d) a printing layer applied to the first semitransparent functional layer; e) an adhesive layer; f) a second semitransparent functional layer; g) a second embossing lacquer layer; h) optionally a second film substrate; wherein the viewing of the security element with respect to the first film substrate a) from the side opposite the layers b) to h) defines the viewing of the security element front side and the viewing of the security element with respect to the optional second film substrate h) of the Layers a) to g) on the opposite side defines the viewing of the security element back; The first semitransparent functional layer c) forms a first motif that can be recognized when viewing the security element front side in reflected light; - The semitransparent second functional layer f) forms a recognizable when viewing the security element back in incident light second motif; The pressure layer d) applied to the first semitransparent functional layer forms a hidden third motif that is invisible when viewing the security element front side in the reflected light and is obscured by the first semitransparent functional layer c) and which, when viewing the security element back side in FIG Incident light is not recognizable and is covered by the second semitransparent functional layer f) and that is visible when viewing the security element in transmitted light both from the front side and from the rear side. The printing layer d) applied to the first semitransparent functional layer can in particular be produced by a gravure printing, flexographic printing, screen printing or inkjet process, the gravure printing process being preferred.
• 2. (Preferred embodiment) Security element according to paragraph 1, wherein the second film substrate h) is mandatory and the security element by gluing two separate security element parts by means of the adhesive layer e) is available, wherein the first security element part of the layers a) to d) and the second security element part comprises layers f) to h). Alternatively, the security element according to paragraph 1 having the layers a) to g) is obtainable by bonding two separate security element parts by means of the adhesive layer e) in a first step, wherein the first security element part comprises the layers a) to d) and the second security element part comprises layers f) to h), and in a second step the second film substrate h) is detached from the resulting layer structure (in this case the second film substrate h) is a so-called transfer film).
• 3. (Preferred embodiment) A security element according to paragraph 1 or 2, wherein the second semitransparent functional layer f) is a semitransparent mirror layer, in particular a metal consisting of the group consisting of Al, Ag, Ni, Cr, Cu, Au and an alloy of a or more of the above elements is selected.
• 4. (Preferred embodiment) Security element according to paragraph 3, wherein the second semitransparent functional layer f) is based on Al or an Al alloy.
• 5. (Preferred embodiment) Security element according to one of the paragraphs 1 to 4, wherein the first semi-transparent functional layer c) on the other hand has different shades when viewed in reflected light on the one hand and when viewed in transmitted light.
• 6. (Preferred embodiment) A security element according to paragraph 5, wherein the first semitransparent functional layer c) has a multilayer structure with two semitransparent mirror layers and a dielectric layer arranged between the two semitransparent mirror layers, which appears gold-colored in particular when viewed in reflected light and when viewed in transmitted light shows a blue hue.
• 7. (Preferred Embodiment) A security element according to paragraph 6, wherein the two semitransparent mirror layers are respectively selected from Al or Ag and the dielectric layer is an SiO ₂ layer.
• 8. (Preferred embodiment) The security element according to paragraph 7, wherein each of the two semitransparent mirror layers is based on Al and has a layer thickness in a range of 5 nm to 20 nm, preferably in a range of 10 nm to 14 nm, and the dielectric SiO ₂ Layer has a layer thickness in a range of 50 nm to 450 nm, preferably in a range of 80 nm to 260 nm, and more preferably in a range of 210 nm to 260 nm.
• 9. (Preferred Embodiment) The security element according to paragraph 7, wherein each of the two semitransparent mirror layers is based on Ag and has a layer thickness in a range of 15 nm to 25 nm and the dielectric SiO ₂ layer has a layer thickness in a range of 50 nm to 450 nm, preferably in a range of 80 nm to 260 nm, and more preferably in a range of 210 nm to 260 nm.
• 10. (Preferred embodiment) Security element according to paragraph 5, wherein the first semitransparent functional layer c) is based on a printable layer having an effect pigment composition.
• 11. (Preferred embodiment) A security element according to any one of paragraphs 1 to 10, wherein the first Embossing lacquer layer b) and the first semitransparent functional layer c) form a first optically variable structure, in particular a diffractive relief structure or hologram structure or a microoptical relief structure (in particular a micromirror arrangement), and the second embossing lacquer layer g) and the second semitransparent functional layer f) form a second optically variable structure, in particular a diffractive relief structure or hologram structure or a microoptical relief structure (in particular a micromirror arrangement), wherein the second optically variable structure is selected independently of the first optically variable structure.
• 12. (Preferred embodiment) Security element according to paragraph 11, wherein the first embossing lacquer layer b) and the first semitransparent functional layer c) form a diffractive relief structure and the second embossing lacquer layer g) and the second semitransparent functional layer f) form a microoptical relief structure, or vice versa.
• 13. (Preferred embodiment) A security element according to any one of paragraphs 1 to 12, wherein the layer structure in addition to the layers a), b), c), d), e), f) and g) and the optionally present layer h) a Adhesive layer i) arranged for bonding the security element to a value document or security paper via an optionally present primer layer, the adhesive layer i) in particular on the first film substrate a), on the optionally present second film substrate h) or in the case that Film substrate h) is not present, on the second embossing lacquer layer g) is arranged.
• 14. (Preferred embodiment) Security element according to one of the paragraphs 1 to 13, wherein the hidden third motif is in the context of meaning with the first motif and / or the second motif.
• 15. (Second aspect of the invention) Data carrier, in particular a value document or a security paper, which is equipped with the security element according to one of claims 1 to 14.
• 16. (Preferred Embodiment) The data carrier according to paragraph 15, wherein the data carrier is based on a data carrier substrate with a window area and the security element is arranged in the window area of the data carrier substrate.

Detailed description of the invention

The value document mentioned in the present description can be a banknote, in particular a paper banknote, a polymer banknote or a film composite banknote, a share, a bond, a certificate, a coupon, a check, a high-quality admission ticket, but also an identity card such as a credit card, a bank card, a cash card, an entitlement card, an identity card, or a pass personalization page.

A reflection in incident light is, in the sense of this invention, an illumination of the security element from one side and a viewing of the security element from the same side. A reflection in reflected light is thus present, for example, when the front of the security element is illuminated and also viewed.

A reflection in the transmitted light is in the sense of this invention an illumination of a security element from one side and a view of the security element from another side, in particular the opposite side. A reflection in transmitted light is thus, for example, when the back of the security element illuminated and the front of the security element is considered. The light thus shines through the security element.

The security element according to the invention can, for. B. as a patch or label, as (endless) strip or as (endless) thread present.

The data carrier substrate of the data carrier to be equipped with the security element according to the invention is in particular a paper substrate or a paper-like substrate, a polymer substrate, a paper / film / paper composite substrate or a film / paper / film composite substrate. A security document provided with a window portion may be used in the case of a paper substrate, a paper / foil / paper composite substrate, or a foil / paper / foil composite substrate, e.g. B. by means of a continuous recess within the paper layer (s) are generated. Alternatively, the paper layer may be coated by means of a suitable liquid, e.g. B. by means of aqueous sulfuric acid solution are made transparent in a certain range. In the case of a value document based on a transparent polymer substrate, a window area may be z. B. by means of congruent recesses in the applied on the front and back of the polymer substrate opaque print layers are generated.

A preferred security element comprises at least one semitransparent functional layer which, on the other hand, has different hues when viewed in incident light on the one hand and when viewed in transmitted light on the other hand. The two different shades are z. B. Complementary colors. Such a semitransparent functional layer is based, for. B. on a multi-layered structure with two semitransparent mirror layers and a disposed between the two semitransparent mirror layers dielectric layer. Such a multi-layered structure, which appears golden when viewed in reflected light and shows a blue hue when viewed in transmitted light, is z. B. from the WO 2011/082761 A1 known.

• – die beiden semitransparenten Spiegelschichten werden bevorzugt von Al oder Ag gewählt; die dielektrische Schicht ist insbesondere eine SiO₂-Schicht;
• – im Falle, dass jede der beiden semitransparenten Spiegelschichten 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 Spiegelschichten 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 structures having two semitransparent mirror layers and a dielectric layer arranged between the two semitransparent mirror layers preferably have the following physical properties:

• The two semitransparent mirror layers are preferably selected from Al or Ag; the dielectric layer is in particular an SiO ₂ layer;
• In the case where each of the two semitransparent mirror layers is based on Al, the respective preferred layer thickness is in a range of 5 nm to 20 nm, particularly preferably in a range of 10 nm to 14 nm; the SiO ₂ dielectric layer preferably has a layer thickness in a range of 50 nm to 450 nm, more preferably in a range of 80 nm to 260 nm, and particularly preferably in a range of 210 nm to 260 nm, wherein the ranges of 80 nm up to 100 nm and from 210 nm to 240 nm are especially preferred for providing a gold / blue color change;
• In the case where each of the two semitransparent mirror layers is based on Ag, the respective preferred layer thickness is in a range of 15 nm to 25 nm; the SiO ₂ dielectric layer preferably has a layer thickness in a range of 50 nm to 450 nm, more preferably in a range of 80 nm to 260 nm, and particularly preferably in a range of 210 nm to 260 nm, wherein the ranges of 80 nm to 100 nm and from 210 nm to 240 nm are especially preferred 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 said multilayered layer structures not only enable the generation of a semitransparent functional layer, which appears golden when viewed in reflected light and shows a blue hue when viewed in transmitted light, but depending on the choice of the layer thickness, in particular the dielectric layer further color changes can be generated, for. B.

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

On the other hand, a semitransparent functional layer which has different hues when viewed in incident light on the one hand and when viewed in transmitted light on the other hand, may be based on an effect pigment composition. Printed layers based on an effect pigment composition which, when viewed in incident 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, z. B. in the WO 2011/064162 A2 described.

In a preferred security element, the first motif recognizable when viewing the security element front side in the reflected light represents a hologram (ie the first embossing lacquer layer b) and the first semi-transparent functional layer c) form a diffractive relief structure or hologram structure, and this when viewing the security element Rear side recognizable in incident light second motif is based on a micro-optical relief structure, in particular a micromirror arrangement (ie, the second embossing lacquer layer g) and the second semitransparent functional layer f) form a micro-optical relief structure, in particular a micromirror arrangement). The production of a microoptical relief structure is known in the art (see, for example, US Pat WO 2014/060089 A2 ).

According to an alternative to the above preferred security element, the first motif which can be recognized by the incident light when viewed from the front of the security element is based on a microoptical relief structure, in particular a micromirror arrangement, and the second motif recognizable when viewed in front of the security element back represents a hologram.

According to a further alternative to the above two preferred security elements, both the first motif recognizable when viewing the security element front side in incident light and the second motif recognizable when viewed in the reflected light when viewing the security element backside each represent a hologram.

According to a further alternative to the above three preferred security elements, both the first motif recognizable when viewing the security element front side in incident light and the second motif recognizable by reflected light when viewing the security element back are respectively based on a microoptical relief structure, in particular a micromirror arrangement ,

In the security element according to the invention, the first motif, the second motif and the third motif can be formed independently of one another in the form of a pattern or an image, in the form of characters or a character string or in the form of an encoding.

According to the invention, it is provided that the printed layer d) applied to the first semitransparent functional layer forms a hidden third motif that is not recognizable in reflected light when the security element front side is viewed and obscured by the first semitransparent functional layer c) Rear side of the security element is not recognizable in incident light and is covered by the second semitransparent functional layer f) and that can be seen when viewing the security element in transmitted light both from the front side and from the rear side. The third motif can be z. B. by gravure printing, flexographic printing, screen printing or by an inkjet process, preferably by means of gravure printing, are generated. The third motif can be z. B. in the form of Characters or a string, in the form of a coding, in the form of a pattern, an image or a portrait.

Further exemplary embodiments and advantages of the invention are explained below with reference to the figures, in the representation of which a representation true to scale and proportion has been dispensed with in order to increase the clarity.

Show it:

1 the top view of a document of value with a window area and arranged above the window area security element;

2 the cross-sectional view of the in the 1 shown value document;

3 the window area of a value document according to an embodiment when viewing the front side of the value document in incident light;

4 the window area of a value document according to the embodiment when viewing the back side of the value document in reflected light;

5 the window area of a value document according to the embodiment when viewing the front or the back of the document of value in transmitted light;

6 to 9 an example of the production of a security element according to the invention;

9 a security element according to an embodiment;

10 the security element of 9 , which additionally has an adhesive layer.

1 shows a value document 1 , in the present example a banknote, in plan view. The value document 1 rests on a paper substrate and has a window area 2 on (shown in dashed lines). The window area 2 can z. B. by means of a punched produced, through opening in the paper substrate. The value document 1 is on its front side with a security element 3 provided that the window area 2 of the value document 1 covering one side.

2 shows the value document 1 of the 1 in cross-sectional view (along in the 1 shown line A-A ').

The value document 1 based on a paper substrate 4 that has a breaching recess 2 having. The recess 2 was produced by punching and lies in the paper substrate 4 when viewed in plan view in the form of a square with the dimensions 1 cm × 1 cm before (the dimensions can be chosen arbitrarily, as well as the shape of the window or the recess). The value document 4 is on the front with a foil security element 3 provided that the breakthrough recess 2 covering one side. The foil security element 3 is by means of a peripheral adhesive layer (not shown in the figure) on the paper substrate 4 attached.

3 shows the window area 2 of the value document 1 according to an embodiment when viewing the front in reflected light. The viewer takes a metallic hologram motif 5 true.

4 shows the window area 2 of the value document 1 according to the embodiment when viewing the back in incident light. The viewer takes the areas 6 and 7 true in the form of a golden color. The area 6 makes the denomination of banknote "50" and appears to the viewer as compared to the background 7 in the form of a deceptively real, three-dimensional arched surface.

5 shows the window area 2 of the value document 1 when viewed in transmitted light, from the front or the back. The viewer takes the white area 8th in the form of a blue background true, in front of which are the black characters 9 (which in the example represent the denomination "50" of the banknote) take off significantly.

6 to 10 illustrate an example of the preparation of in the 1 to 5 shown security elements 3 ,

6 shows the production of a first security element part, wherein on a film substrate 10 (For example, a polyethylene terephthalate film) first an embossing lacquer layer 11 is applied. The embossing lacquer layer 11 can z. B. based on a UV-curing lacquer on the film substrate 10 is printed, then provided with an embossed pattern and finally UV-crosslinked. On the embossing lacquer layer 11 is thereafter by means of an Al / SiO ₂ / Al layer sequence (in the figure, the reference numerals 12 and 14 each an Al layer, the reference number 13 denotes a SiO ₂ layer) generates a motif.

The provision of in the 6 shown, through the layer sequence 12 to 14 formed motif can z. Example, by means of a washing process known in the art, in which the carrier film 10 and the embossing lacquer layer applied thereto 11 first with an activated with suitable solvents ink ( "washable ink") is printed in the form of characters, is successively provided with an aluminum layer, having a SiO ₂ layer and a further layer of aluminum and the ink finally together with the directly overlying portions of the Al , SiO ₂ and Al layers are removed by washing with a liquid to produce coating-free areas in the form of the characters. Suitable inks are z. B. in the WO 97/23357 described. Alternatively, in the 6 shown, through the layer sequence 12 to 14 However, motif formed by laser demetalization or by etching, possibly with the aid of any photoresist layers, produced. The use of photoresist coatings in the security element production is z. B. from the EP 2 049 345 B1 known.

In the 6 form the Al layer 12 , the SiO ₂ layer 13 and the Al layer 14 together a semitransparent functional layer 15 , which appears golden when viewed in reflected light and shows a blue hue when viewed in transmitted light. Such a multi-layered structure, which appears golden when viewed in reflected light and shows a blue hue when viewed in transmitted light, is z. B. from the WO 2011/082761 A1 known.

According to the 7 becomes the semitransparent functional layer 15 by means of gravure printing with a black print layer forming the hidden motif 16 Mistake.

The in the 6 and 7 shown semitransparent functional layer 15 that forms in the 4 shown motif. The viewer takes the semitransparent functional layer 15 when considering the security element 3 in the incident light through the layers 10 and 11 through in the form of the areas 6 and 7 true metallic-golden. The area 6 makes the denomination of banknote "50" and appears to the viewer as compared to the background 7 in the form of a deceptively real, three-dimensional arched surface. The three-dimensional impression can be created by adding the embossing lacquer layer 11 equipped with a micro-optical relief structure. The production of a microoptical relief structure is known in the art (see, for example, US Pat WO 2014/060089 A2 ).

8th shows the production of a second security element part, wherein on a film substrate 17 (For example, a polyethylene terephthalate film) first an embossing lacquer layer 18 is applied. The embossing lacquer layer 18 can z. B. based on a UV-curing lacquer on the film substrate 17 is printed, then provided with an embossed pattern and finally UV-crosslinked. On the embossing lacquer layer 18 is then treated by means of a semi-transparent Al layer 19 creates a motif. The exact generation of the motif can, for. Example, by means of a washing process, by laser demetalization or by an etching process, as described above.

The in the 8th shown semitransparent functional layer 19 that forms in the 3 hologram motif shown 5 , The viewer takes the semitransparent functional layer 19 when considering the security element 3 in the incident light through the layers 17 and 18 through metallic shiny true. The creation of the hologram motif 5 based on that one the embossing lacquer layer 18 equipped with a diffractive relief structure.

9 shows the step of gluing in the 7 shown first security element part with the in the 8th shown second security element part by means of an adhesive layer 20 , As can be seen, the gluing of the two security element parts takes place register-accurate, so that the printing layer forming the hidden motif 16 on the one hand by the semitransparent functional layer 15 and on the other hand by the semitransparent functional layer 19 is covered.

The printing layer forming the hidden motive 16 The viewer takes in transmitted light, both from the front and from the back, in the form of in the 5 shown black characters 9 in front of blue background 8th true. The blue background 8th goes to the semitransparent functional layer 15 which, when viewed in reflected light, appears golden in color and shows a blue hue when viewed in transmitted light (and that from the Al layer 12 , the SiO ₂ layer 13 and the Al layer 14 is composed).

According to the 10 can the security element on an optional primer layer 21 with an adhesive layer 22 for bonding to a valuable document substrate or security paper substrate. 10 shows the case that the adhesive layer 22 on the film substrate 17 is appropriate. Alternatively, the adhesive layer could 22 via an optionally present primer layer on the film substrate 10 to be appropriate.

Furthermore, that is in the 10 shown film substrate 17 only optional, ie the film substrate 17 is not mandatory. The Indian 9 Layer structure shown, which consists of a first security element part according to the 7 and a second security element part according to 8th can also be obtained that the second-security element part according to the 8th with a removable film substrate 17 Is provided. The removable film substrate 17 can of that in the 9 removed layer structure are removed, before getting the adhesive layer 22 via an optional primer layer 21 applies.

The security element according to the 10 put that in the 2 shown in the window area 2 of the value document 1 arranged security element 3 When looking at the front of the value document 1 in the reflected light, the viewer takes that through the semitransparent functional layer 15 generated motif true (see 4 ). Looking at the back of the value document 1 in the reflected light, the viewer takes that through the semitransparent functional layer 19 generated motif true (see 3 ). When considering the value document 1 in transmitted light, whether from the front or the back, the viewer takes the hidden print information 16 true (see 5 ).

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• WO 95/10420 A1 [0004]
• WO 2005/025891 A2 [0005]
• WO 2010/000432 A1 [0006]
• WO 2011/015622 A1 [0007]
• WO 2014/108329 A1 [0008]
• WO 2011/082761 A1 [0016, 0045]
• WO 2011/064162 A2 [0019]
• WO 2014/060089 A2 [0020, 0047]
• WO 97/23357 [0044]
• EP 2049345 B1 [0044]

Claims (16)

Security element for securing a value document or a security paper, the security element having a layer structure with the following layer sequence: a) a first film substrate; b) a first embossing lacquer layer; c) a first semitransparent functional layer; d) a printing layer applied to the first semitransparent functional layer; e) an adhesive layer; f) a second semitransparent functional layer; g) a second embossing lacquer layer; h) optionally a second film substrate; in which The viewing of the security element with respect to the first film substrate a) from the side opposite the layers b) to h) defines the viewing of the security element front side and the viewing of the security element with respect to the optional second film substrate h) of the layers a) to g) on the opposite side defines the viewing of the security element back; The first semitransparent functional layer c) forms a first motif that can be recognized when viewing the security element front side in reflected light; - The semitransparent second functional layer f) forms a recognizable when viewing the security element back in incident light second motif; The pressure layer d) applied to the first semitransparent functional layer forms a hidden third motif that is invisible when viewing the security element front side in the reflected light and is obscured by the first semitransparent functional layer c) and which, when viewing the security element back side in FIG Incident light is not recognizable and is covered by the second semitransparent functional layer f) and that is visible when viewing the security element in transmitted light both from the front side and from the rear side. The security element according to claim 1, wherein the security element is obtainable by adhering two separate security element parts by means of the adhesive layer e), wherein the first security element part comprises the layers a) to d) and the second security element part the layers f) to h ), wherein after bonding, if appropriate, the second film substrate h) is detached from the resulting layer structure. A security element according to claim 1 or 2, wherein the second semitransparent functional layer f) is a semi-transparent mirror layer, in particular a metal selected from the group consisting of Al, Ag, Ni, Cr, Cu, Au and an alloy of one or more of the aforementioned elements is selected. The security element according to claim 3, wherein the second semitransparent functional layer f) is based on Al or an Al alloy. Security element according to one of claims 1 to 4, wherein the first semitransparent functional layer c) when viewed in incident light on the one hand and when viewed in transmitted light on the other hand has different shades. The security element according to claim 5, wherein the first semitransparent functional layer c) has a multilayer structure with two semitransparent mirror layers and a dielectric layer arranged between the two semitransparent mirror layers, which appears golden in particular when viewed in reflected light and shows a blue hue when viewed in transmitted light , A security element according to claim 6, wherein the two semitransparent mirror layers of Al or Ag are selected and the dielectric layer is a SiO ₂ layer. The security element according to claim 7, wherein each of the two semitransparent mirror layers is Al-based and has a layer thickness in a range of 5 nm to 20 nm, preferably in a range of 10 nm to 14 nm, and the SiO ₂ dielectric layer has a layer thickness in one Range of 50 nm to 450 nm, preferably in a range of 80 nm to 260 nm. A security element according to claim 7, wherein each of the two semitransparent mirror layers is based on Ag and has a layer thickness in a range of 15 nm to 25 nm, and the dielectric SiO ₂ layer has a layer thickness in a range of 50 nm to 450 nm, preferably in a range from 80 nm to 260 nm. The security element according to claim 5, wherein the first semitransparent functional layer c) is based on a printable layer having an effect pigment composition. The security element according to one of claims 1 to 10, wherein the first embossing lacquer layer b) and the first semitransparent functional layer c) form a first optically variable structure, in particular a diffractive relief structure or a microoptical relief structure, and the second embossing lacquer layer g) and the second semitransparent functional layer f) form a second optically variable structure, in particular a diffractive relief structure or a microoptical relief structure, wherein the second optically variable structure is selected independently of the first optically variable structure. The security element according to claim 11, wherein the first embossing lacquer layer b) and the first semitransparent functional layer c) form a diffractive relief structure and the second embossing lacquer layer g) and the second semitransparent functional layer f) form a microoptical relief structure, or vice versa. Security element according to one of claims 1 to 12, wherein the layer structure in addition to the layers a), b), c), d), e), f) and g) and the optional layer h) an adhesive layer i) for bonding of the security element having a value document or security paper. Security element according to one of claims 1 to 13, wherein the hidden third motif is in the context of meaning with the first motif and / or the second motif. Data carrier, in particular a value document or a security paper, which is equipped with the security element according to one of claims 1 to 14. The data carrier according to claim 15, wherein the data carrier is based on a data carrier substrate with a window area and the security element is arranged in the window area of the data carrier substrate.

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