DE102015014505A1 - Security element, method for producing the same and equipped with the security element disk - Google Patents

Abstract

The invention relates to a security element for securing value documents, comprising a transparent carrier substrate and a first semitransparent functional layer, which has a multilayer structure comprising a first semitransparent metallic layer, a second semitransparent metallic layer and a dielectric layer arranged between the first and second semitransparent metallic layers wherein the second semitransparent metallic layer is present at least partially in a greater layer thickness than that of the first semitransparent metallic layer.

Description

The invention relates to a security element, a method for producing the same and equipped with the security element data carrier, for. A value document such as a banknote.

Data carriers, such as valuables or identity documents, or other valuables, such as branded articles, are often provided with security elements for the purpose of security, which permit verification of the authenticity of the data carriers and at the same time serve as protection against unauthorized reproduction.

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

Proceeding from this, the object of the invention is to specify a security element of the type mentioned above with high security against forgery and an attractive visual appearance and a production method therefor.

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 value documents, comprising a transparent carrier substrate and a first semitransparent functional layer having a multilayer structure with a first semitransparent metallic layer, a second semitransparent metallic layer and one between the first and the second semitransparent metallic Layer disposed dielectric layer, wherein the second semitransparent metallic layer is present at least partially in a greater layer thickness than that of the first semitransparent metallic layer. Preferably, the layer thickness of the second semitransparent metallic layer is at least partially 1.5 to 2 times as high as the layer thickness of the first semitransparent metallic layer.
• 2. (Preferred embodiment) Security element according to paragraph 1, wherein the security element has the following layer structure in the following order: Transparent carrier substrate; - first semitransparent metallic layer; - dielectric layer; Second semitransparent metallic layer, which is present at least partially in a greater layer thickness than that of the first semitransparent metallic layer. Preferably, the layer thickness of the second semitransparent metallic layer is at least partially 1.5 to 2 times as high as the layer thickness of the first semitransparent metallic layer.
• 3. (Preferred embodiment) The security element according to paragraph 2, wherein the second semitransparent metallic layer defines the front side of the semitransparent functional layer and the first semitransparent functional layer defines the back side of the semitransparent functional layer and the semitransparent functional layer - When viewing the back in reflected light has a first, visually recognizable color; When viewing the front side in incident light at the location where the second semitransparent metallic layer is present in a greater layer thickness than the first semi-transparent metallic layer, has a second visually recognizable color and otherwise has the first visually recognizable color; - When viewing both the front in the transmitted light, as well as the back in the transmitted light has a third, visually recognizable color.
• 4. (Preferred embodiment) A security element according to paragraph 3, wherein the two semi-transparent metallic layers of Al or Ag are selected and the dielectric layer is a SiO ₂ layer and the visually recognizable colors are preferably the following colors: the first visually recognizable color is gold; The second visually recognizable color is silver; - the third visually recognizable color is blue.
• 5. (Preferred embodiment) A security element according to one of paragraphs 1 to 4, wherein the first semitransparent functional layer having a multilayer structure is such that the first semitransparent metallic layer and the dielectric layer are each present in a uniform layer thickness and the second semitransparent metallic layer in first regions has the same layer thickness as the first semitransparent metallic layer and in the second regions has a greater layer thickness than that of the first semitransparent metallic layer.
• 6. (Preferred embodiment) Security element according to paragraph 5, wherein the security element - when looking at the back in the incident light appears golden; - Looking at the front in the reflected light in the first areas of gold and appears in the second areas silver; - When viewing both the front in the transmitted light, and the back in the transmitted light appears bluish.
• 7. (Preferred embodiment) A security element according to one of the paragraphs 1 to 6, wherein the transparent carrier substrate of the security element next to the first semitransparent functional layer has a second, technically available by means of an effect pigment composition semitransparent functional layer, wherein the second semitransparent functional layer when viewed in Reflected light, both from the back and the front in the first, visually recognizable color and appears when viewed in transmitted light, both from the back and from the front in the third, visually recognizable color.
• 8. (Preferred embodiment) Security element according to paragraph 7, wherein the second semitransparent functional layer when viewed in reflected light, both from the back, as well as from the front appears gold-colored and when viewed in transmitted light, both from the back, and from the front, bluish appears.
• 9. (Preferred embodiment) A security element according to any one of paragraphs 1 to 8, wherein the security element is a (continuous) strip, an (endless) thread or a patch or label.
• 10. (Preferred embodiment) A security element according to one of the paragraphs 1 to 9, wherein between the transparent carrier substrate and the semitransparent functional layer an embossing lacquer layer is present which in particular has a relief structure forming a diffractive structure and / or a relief structure forming a micromirror arrangement.
• 11. (Second aspect of the invention) Data carrier with a security element according to one of the paragraphs 1 to 10.
• 12. (Preferred embodiment) Data carrier according to paragraph 11, wherein the data carrier is a value document, such as a banknote, in particular a paper banknote, polymer banknote or composite film banknote, or identity card.
• 13. (Preferred embodiment) Data carrier according to paragraph 11 or 12, wherein the security element is arranged above a window region formed in the data carrier substrate.
• 14. (Third aspect of the invention) A method for producing a security element for securing value documents, comprising a transparent carrier substrate and a first semitransparent functional layer having a multilayer structure comprising a first semitransparent metallic layer, a second semitransparent metallic layer and one between the first and second the second semitransparent metallic layer is at least partially in a greater layer thickness than that of the first semitransparent metallic layer, the method comprising the following steps: a) providing a transparent carrier substrate; b) optionally providing the transparent carrier substrate with an embossing lacquer layer which in particular has a relief structure forming a diffractive structure and / or a relief structure forming a micromirror arrangement; c) applying a multi-layered structure over a full area comprising a first semitransparent metallic layer, a second semitransparent metallic layer and a dielectric layer disposed between the first and second semitransparent metallic layers; d) printing a soluble wash ink at least partially on the last applied second semitransparent metallic layer; e) full-surface application of additional semitransparent metal; f) the washing off of the washing ink together with the region of the semitransparent metal applied above the wash ink in the step e). Preferably, the layer thickness of the second semitransparent metallic layer is at least partially 1.5 to 2 times as high as the layer thickness of the first semitransparent metallic layer.

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 incident light is thus, for example, then when the front of the security element is lit 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.

The semitransparent functional layer, on the other hand, has different hues when viewed in reflected 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 semi-transparent metallic layers and a disposed between the two semitransparent metal 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 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 multi-layered structures with two semitransparent metallic layers and a dielectric layer arranged between the two semitransparent metallic layers typically have the following physical properties:

• The two semitransparent metallic 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 metallic 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 metallic 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 abovementioned multi-layered layer structures not only enable the production of a semitransparent functional layer which appears gold-colored when viewed in reflected light and shows a blue hue when viewed in transmitted light, but further color changes can be produced depending on the choice of the layer thickness, in particular of the dielectric layer , 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.

The security element according to the invention has a first semitransparent functional layer having a multilayer structure with a first semitransparent metallic layer, a second semitransparent metallic layer and a dielectric layer arranged between the first and the second semitransparent metallic layer, wherein the semitransparent functional layer is such that the second semitransparent metallic layer is present at least partially in a greater layer thickness than the first semitransparent metallic layer. It is preferred that the layer thickness of the second semitransparent metallic layer is 1.5 to 2 times as high as the layer thickness of the first semitransparent metallic layer is. In this way, it can be ensured that the observer immediately perceives a second visually recognizable color when viewing the front side in reflected light at the location where the second semitransparent metallic layer is present in a greater layer thickness than the first semitransparent metallic layer, and otherwise perceives the first visually recognizable color.

According to a preferred variant, the security element according to the invention is such that the transparent carrier substrate has, in addition to the first semitransparent functional layer, a second semitransparent functional layer which can be obtained by means of an effect pigment composition, the second semitransparent functional layer being viewed in reflected light, both from the rear side , as well as from the front appears in the first, visually recognizable color and when viewed in transmitted light, both from the back and from the front appears in the third, visually recognizable color. 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. The pigments preferably have a longest dimension of edge length from 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 (ie the ratio of the longest dimension from end to end relative to the thickness) is preferably at least 1.5, in particular in a range from 1.5 to 300. The ratio of the binder to metal pigment is preferably below 10: 1, in particular below 5: 1. Depending on the choice of aspect ratio of the pigment, its longest end-to-end dimension, and the pigment / binder ratio adjustment, the color can be seen in transmission and the color when viewed in reflection when viewed in the print layer (e.g. Blue in transmission and silver, gold, bronze, copper or violet in reflection, in addition also violet, magenta, pink, green or brown in transmission and different colors in reflection, which depend on the choice of pigment / binder ratio). Colors with gold / blue color change between reflection and transmission (in other words, between incident light and transmitted light viewing) are for. B. in Examples 1, 2 and 3 in Table 1 of WO 2011/064162 A2 called. Further, Example 4 shows a color with gold / violet color change, Example 5 a color with green-gold / magenta color change, Example 7 a color with violet / green color change and Example 8 a color with silver / opaque color change.

• a) transparentes Trägersubstrat, z. B. Polyethylenterephthalat(PET)-Folie;
• b) gegebenenfalls eine Prägelackschicht, die insbesondere eine diffraktive Struktur bildende Reliefstruktur und/oder eine Mikrospiegelanordnung bildende Reliefstruktur aufweist;
• b) eine erste semitransparente metallischen Schicht, z. B. Aluminium;
• c) eine dielektrischen Schicht, z. B. SiO₂;
• d) eine zweite semitransparente metallische Schicht, z. B. Aluminium, die mindestens teilweise in einer größeren Schichtdicke als die der ersten semitransparenten metallischen Schicht vorliegt.
• e) gegebenenfalls eine Klebschicht, z. B. eine Heißsiegelbeschichtung, die für das Verkleben des Sicherheitselements mit einem Datenträger, z. B. einem Wertdokument, geeignet ist.

According to an advantageous variant (A), the security element according to the invention has the following layer sequence:

• a) transparent carrier substrate, for. B. polyethylene terephthalate (PET) film;
• b) optionally an embossing lacquer layer which has in particular a relief structure forming a diffractive structure and / or a relief structure forming a micromirror arrangement;
• b) a first semitransparent metallic layer, e.g. Aluminum;
• c) a dielectric layer, e.g. For example SiO ₂ ;
• d) a second semitransparent metallic layer, e.g. As aluminum, which is present at least partially in a greater layer thickness than that of the first semitransparent metallic layer.
• e) optionally an adhesive layer, for. B. a heat seal coating, which is suitable for bonding the security element with a disk, for. B. a value document is suitable.

• A) transparentes Trägersubstrat, z. B. Polyethylenterephthalat(PET)-Folie;
• B) gegebenenfalls eine Prägelackschicht, die insbesondere eine diffraktive Struktur bildende Reliefstruktur und/oder eine Mikrospiegelanordnung bildende Reliefstruktur aufweist; sowohl C1) eine erste semitransparente Funktionsschicht, als auch C2) eine zweite semitransparente Funktionsschicht in Nebeneinanderstellung, d. h. die erste und die zweite semitransparente Funktionsschicht können insbesondere in Angrenzung zueinander oder voneinander beabstandet angeordnet sein, wobei – die erste semitransparente Funktionsschicht die folgenden Schichten aufweist:
• C1a) eine erste semitransparente metallische Schicht, z. B. Aluminium;
• C1b) eine dielektrischen Schicht, z. B. SiO₂;
• C1c) eine zweite semitransparente metallische Schicht, z. B. Aluminium, die in einer größeren Schichtdicke als die der ersten semitransparenten metallischen Schicht vorliegt; und – die zweite semitransparente Funktionsschicht C2) drucktechnisch mittels der oben beschriebenen, aus der WO 2011/064162 A2 bekannten Effektpigment-Zusammensetzung erhältlich ist;
• e) gegebenenfalls eine Klebschicht, z. B. eine Heißsiegelbeschichtung, die für das Verkleben des Sicherheitselements mit einem Datenträger, z. B. einem Wertdokument, geeignet ist.

According to a further, advantageous variant (B), the security element according to the invention has the following layer sequence:

• A) transparent carrier substrate, for. B. polyethylene terephthalate (PET) film;
• B) if appropriate an embossing lacquer layer which has in particular a relief structure forming a diffractive structure and / or a relief structure forming a micromirror arrangement; both C1) a first semitransparent functional layer, and C2) a second semitransparent functional layer in juxtaposition, ie the first and the second semitransparent functional layer can be arranged in particular in adjacency to one another or spaced from one another, wherein - the first semitransparent functional layer comprises the following layers:
• C1a) a first semitransparent metallic layer, e.g. Aluminum;
• C1b) a dielectric layer, e.g. For example SiO ₂ ;
• C1c) a second semitransparent metallic layer, e.g. Example, aluminum, which is present in a greater layer thickness than that of the first semitransparent metallic layer; and - the second semitransparent functional layer C2) by means of printing technology described above, from WO 2011/064162 A2 known effect pigment composition is available;
• e) optionally an adhesive layer, for. B. a heat seal coating, which is suitable for bonding the security element with a disk, for. B. a value document is suitable.

The first semitransparent functional layer mentioned in the above variants may alternatively be an Ag / SiO ₂ / Ag structure instead of an Al / SiO ₂ / Al structure.

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 a security element according to the invention;

2 another inventive security element;

3 Yet another inventive security element.

• a) ein Trägersubstrat 7, z. B. eine PET(Polyethylenterephthalat)-Folie;
• b) eine Aluminium-Metallisierung 6 mit vergleichsweise geringer Schichtdicke, z. B. 5 bis 15 Nanometer;
• c) eine SiO₂-Schicht 5 mit einer Schichtdicke z. B. von 210 bis 240 Nanometer;
• d) eine Aluminium-Metallisierung 4 mit vergleichsweise hoher Schichtdicke, z. B. 15 bis 30 Nanometer;
• e) eine Klebschicht 3, z. B. eine Heißsiegelbeschichtung.

1 shows a value document, namely a banknote, with a window area and a security element according to the invention applied to the value document substrate in the window area. The window area of the value document is replaced by a z. B. produced by punching recess 2 in the paper layer 1 educated. The security element has the following layers:

• a) a carrier substrate 7 , z. B. a PET (polyethylene terephthalate) film;
• b) an aluminum metallization 6 with comparatively small layer thickness, z. 5 to 15 nanometers;
• c) an SiO ₂ layer 5 with a layer thickness z. From 210 to 240 nanometers;
• d) an aluminum metallization 4 with a comparatively high layer thickness, z. From 15 to 30 nanometers;
• e) an adhesive layer 3 , z. B. a heat seal coating.

The aluminum metallization 4 with comparatively high layer thickness, the front side of the layers represents 4 . 5 , and 6 comprehensive semitransparent functional layer. The aluminum metallization 6 with comparatively low layer thickness, the back side of the layers represents 4 . 5 , and 6 comprehensive semitransparent functional layer.

The block arrow 8th shows the viewing of the front of the security element. The observer perceives the security element when viewing the front of the security element in the reflected light in silver color.

The block arrow 9 shows the viewing of the back of the security element. The observer perceives the security element in golden color when viewing the rear side of the security element in reflected light.

The security element appears when viewed in transmitted light, both from the front, as well as from the back, in the color blue.

That in the 1 shown, the layers 3 to 7 Comprehensive security element can additionally between the aluminum metallization 6 and the carrier substrate 7 an embossing lacquer layer, e.g. B. a UV varnish, which in particular contains a relief structure forming a diffractive structure and / or a relief structure forming a micromirror arrangement.

• a) ein Trägersubstrat 10, z. B. eine PET(Polyethylenterephthalat)-Folie;
• b) eine Aluminium-Metallisierung 11 mit einer Schichtdicke z. B. von 5 bis 15 Nanometer;
• c) eine SiO₂-Schicht 12 mit einer Schichtdicke z. B. von 210 bis 240 Nanometer;
• d) eine Aluminium-Metallisierung 13 mit der gleichen Schichtdicke wie die Aluminium-Metallisierung 11;
• e) eine weitere Aluminium-Metallisierung 14 mit einer Schichtdicke z. B. von 5 bis 15 Nanometer.

2 shows a security element according to the invention according to a further embodiment. The security element has the following layers:

• a) a carrier substrate 10 , z. B. a PET (polyethylene terephthalate) film;
• b) an aluminum metallization 11 with a layer thickness z. From 5 to 15 nanometers;
• c) an SiO ₂ layer 12 with a layer thickness z. From 210 to 240 nanometers;
• d) an aluminum metallization 13 with the same layer thickness as the aluminum metallization 11 ;
• e) another aluminum metallization 14 with a layer thickness z. From 5 to 15 nanometers.

The aluminum metallizations 13 and 14 , which together form a metallization with comparatively high layer thickness, represent the front of the layers 11 . 12 . 13 and 14 comprehensive semitransparent functional layer. The aluminum metallization 11 represents the back of the layers 11 . 12 . 13 and 14 comprehensive semitransparent functional layer.

The block arrows 15 and 16 show the viewing of the front of the security element. The observer takes the security element when viewing the front of the security element in incident light in the place of the block arrow 15 true in silver color. Furthermore, the observer takes the security element when viewing the front of the security element in incident light at the point of the block arrow 16 true in golden color.

The block arrows 17 and 18 show the consideration of the back of the security element. The observer takes the security element when viewing the back of the security element in incident light both at the point of the block arrow 17 , as well as in the place of the block arrow 18 true in golden color.

The security element appears when viewed in transmitted light, both from the front, as well as from the back, in the color blue, and in all places of the block arrows 15 . 16 . 17 and 18 ,

The security element can be above the aluminum metallizations 13 and 14 an adhesive layer, in particular a heat-seal coating, for bonding the security element to a value-document substrate.

Furthermore, that in the 2 shown, the layers 10 to 14 comprehensive security element in addition between the aluminum metallization 11 and the carrier substrate 10 an embossing lacquer layer, e.g. B. a UV varnish, which in particular contains a relief structure forming a diffractive structure and / or a relief structure forming a micromirror arrangement.

• A) ein transparentes Trägersubstrat 19, z. B. eine Polyethylenterephthalat(PET)-Folie; sowohl B1) eine die Schichten 20, 21 und 22 umfassende erste semitransparente Funktionsschicht, als auch B2) eine die Schicht 23 umfassende zweite semitransparente Funktionsschicht in Nebeneinanderstellung, d. h. im vorliegenden Fall in Angrenzung zueinander angeordnet sein, wobei – die erste semitransparente Funktionsschicht die folgenden Schichten aufweist:
• B1a) eine vergleichsweise dünne Aluminium-Metallisierung 20 mit einer Schichtdicke z. B. von 5 bis 15 Nanometer;
• B1b) eine SiO₂-Schicht 21 mit einer Schichtdicke z. B. von 210 bis 240 Nanometer;
• B1c) eine vergleichsweise dicke Aluminium-Metallisierung 22 mit einer Schichtdicke z. B. von 15 bis 30 Nanometer; und – die zweite semitransparente Funktionsschicht B2) drucktechnisch mittels der oben beschriebenen, aus der WO 2011/064162 A2 bekannten Effektpigment-Zusammensetzung erhältlich ist und im Auflicht Gold und im Durchlicht Blau erscheint.

3 shows a security element according to the invention according to a further embodiment, which has the following layer sequence:

• A) a transparent carrier substrate 19 , z. B. a polyethylene terephthalate (PET) film; both B1) one the layers 20 . 21 and 22 comprehensive first semitransparent functional layer, as well as B2) one the layer 23 comprehensive second semitransparent functional layer in juxtaposition, ie in the present case be arranged in adjacency to each other, wherein - the first semitransparent functional layer comprises the following layers:
• B1a) a comparatively thin aluminum metallization 20 with a layer thickness z. From 5 to 15 nanometers;
• B1b) an SiO ₂ layer 21 with a layer thickness z. From 210 to 240 nanometers;
• B1c) a comparatively thick aluminum metallization 22 with a layer thickness z. From 15 to 30 nanometers; and - the second semitransparent functional layer B2) by means of printing technology described above, from the WO 2011/064162 A2 known effect pigment composition is available and appears in incident light gold and transmitted light blue.

The aluminum metallization 22 represents the front of the security element. The aluminum metallization 20 represents the back of the security element.

The block arrows 24 and 25 show the viewing of the front of the security element. The observer takes the security element when viewing the front of the security element in incident light in the place of the block arrow 24 true in silver color. Furthermore, the observer takes the security element when viewing the front of the security element in incident light at the point of the block arrow 25 true in golden color.

The block arrows 26 and 27 show the consideration of the back of the security element. The observer takes the security element when viewing the back of the security element in incident light both at the point of the block arrow 26 , as well as in the place of the block arrow 27 true in golden color.

The security element can be above the aluminum metallization 22 and the effect pigment layer 23 an adhesive layer, in particular a heat-seal coating, for bonding the security element to a value-document substrate.

Furthermore, that in the 3 shown security element in addition between the aluminum metallization 20 and / or the effect pigment layer 23 on the one hand, and the carrier substrate 19 on the other hand, an embossing lacquer layer, e.g. B. a UV varnish, which in particular contains a relief structure forming a diffractive structure and / or a relief structure forming a micromirror arrangement.

In the above embodiments, aluminum was selected to produce the semi-transparent metallic layer. Instead of aluminum z. As silver can be used.

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 2011/082761 A1 [0003, 0011]
• WO 2011/064162 A2 [0015, 0015, 0017, 0037]

Claims (14)

Security element for securing value documents, comprising a transparent carrier substrate and a first semitransparent functional layer, which has a multilayer structure comprising a first semitransparent metallic layer, a second semitransparent metallic layer and a dielectric layer disposed between the first and second semitransparent metallic layers, wherein the second semitransparent metallic layer is present at least partially in a greater layer thickness than that of the first semitransparent metallic layer. A security element according to claim 1, wherein the security element has the following layer structure in order: Transparent carrier substrate; - first semitransparent metallic layer; - dielectric layer; Second semitransparent metallic layer, which is present at least partially in a greater layer thickness than that of the first semitransparent metallic layer. The security element of claim 2, wherein the second semitransparent metallic layer defines the front side of the semitransparent functional layer and the first semi-transparent functional layer defines the back side of the semitransparent functional layer and the semi-transparent functional layer - When viewing the back in reflected light has a first, visually recognizable color; When viewing the front side in reflected light at the location where the second semitransparent metallic layer is present in a greater layer thickness than the first semitransparent metallic layer, has a second visually recognizable color and otherwise has the first visually recognizable color; - When viewing both the front in the transmitted light, as well as the back in the transmitted light has a third, visually recognizable color. A security element according to claim 3, wherein the two semi-transparent metallic layers of Al or Ag are selected and the dielectric layer is an SiO ₂ layer and the visually recognizable colors are preferably the following colors: - the first visually recognizable color is gold; The second visually recognizable color is silver; - the third visually recognizable color is blue. The security element according to claim 1, wherein the first semitransparent functional layer having a multilayer structure is such that the first semitransparent metallic layer and the dielectric layer each have a uniform layer thickness and the second semitransparent metallic layer has the same layer thickness in the first regions has first semitransparent metallic layer and in the second regions has a greater layer thickness than that of the first semitransparent metallic layer. A security element according to claim 5, wherein the security element - When looking at the back in the incident light appears golden; - Looking at the front in the reflected light in the first areas of gold and appears in the second areas silver; - When viewing both the front in the transmitted light, and the back in the transmitted light appears bluish. The security element according to claim 1, wherein the transparent carrier substrate of the security element has, in addition to the first semitransparent functional layer, a second semitransparent functional layer obtainable by means of an effect pigment composition, wherein the second semitransparent functional layer, viewed from incident light, both from the rear side , as well as from the front appears in the first, visually recognizable color and when viewed in transmitted light, both from the back and from the front appears in the third, visually recognizable color. The security element according to claim 7, wherein the second semitransparent functional layer appears gold-colored when viewed in reflected light, both from the rear side and from the front side, and appears bluish when viewed in transmitted light, both from the rear side and from the front side , A security element according to any one of claims 1 to 8, wherein the security element is a (continuous) strip, a (continuous) thread or a patch or label. Security element according to one of claims 1 to 9, wherein between the transparent carrier substrate and the semitransparent functional layer an embossing lacquer layer is present, which in particular has a relief structure forming a diffractive structure and / or a relief structure forming a micromirror arrangement. Data carrier with a security element according to one of claims 1 to 10. The data carrier of claim 11, wherein the data carrier is a value document, such as a banknote, in particular a paper banknote, Polymer banknote or composite film banknote, or badge is. The data carrier according to claim 11 or 12, wherein the security element is arranged above a window region formed in the data carrier substrate. A method for producing a security element for securing value documents, comprising a transparent carrier substrate and a first semitransparent functional layer having a multilayer structure comprising a first semitransparent metallic layer, a second semi-transparent metallic layer and a dielectric layer disposed between the first and second semitransparent metallic layers wherein the second semitransparent metallic layer is at least partially in a greater layer thickness than that of the first semitransparent metallic layer, the method comprising the following steps: a) providing a transparent carrier substrate; b) optionally providing the transparent carrier substrate with an embossing lacquer layer which in particular has a relief structure forming a diffractive structure and / or a relief structure forming a micromirror arrangement; c) applying a multi-layered structure over a full area comprising a first semitransparent metallic layer, a second semitransparent metallic layer and a dielectric layer disposed between the first and second semitransparent metallic layers; d) printing a soluble wash ink at least partially on the last applied second semitransparent metallic layer; e) full-surface application of additional semitransparent metal; f) the washing off of the washing ink together with the region of the semitransparent metal applied above the wash ink in the step e).

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