WO2022106050A1

WO2022106050A1 - Security element, valuable document equipped therewith, and production method

Info

Publication number: WO2022106050A1
Application number: PCT/EP2021/025411
Authority: WO
Inventors: Winfried HOFFMÜLLER; Andreas Rauch; Friedrich Kretschmar; Florian FRÖHLICH
Original assignee: Giesecke+Devrient Currency Technology Gmbh
Priority date: 2020-11-17
Filing date: 2021-10-19
Publication date: 2022-05-27
Also published as: DE102020007028A1

Abstract

The invention relates to a method for producing a security element (12) suitable for securing a valuable document (13), comprising a) providing a temporary carrier substrate (1); b) furnishing the temporary carrier substrate (1) with an embossing varnish layer (3) into which a relief structure (4) is embossed; c) applying, by printing, a functional layer (5) in the form of a motif to the embossing varnish layer (3) so that the functional layer (5), on the side facing the embossing varnish layer (3), conforms to the relief structure (4); d) applying an opaque layer (6) as a layer adjacent to the functional layer (5), the opaque layer (6) masking the functional layer (5), i.e. overlapping the edge region of the functional layer (5); e) applying an adhesive layer (7); f) applying a stationary carrier substrate (8) to the adhesive layer (7); and g) removing the temporary carrier substrate (1) from the embossing varnish layer (3).

Description

Security element, document of value provided with same and manufacturing process

The invention relates to a method for producing a security element suitable for protecting a document of value. The invention also relates to a security element that can be obtained using the method and, moreover, to a document of value that has the security element.

Documents of value, such as banknotes, branded items or identification documents, are often provided with security elements for security purposes, which allow the authenticity of the documents of value 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 from WO 2009/080263 A2, for example, to use security elements with multi-layer thin-layer elements whose color impression changes for the viewer with the viewing angle (hereinafter 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 at the different layers depends on the one hand on the optical thickness of a dielectric Spacer layer, which defines the distance between a semi-transparent 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, it is known to use microstructures as optically variable structures, with the microstructures usually being embossed in an embossing lacquer. The optically variable structures can be present, for example, in the form of holograms or hologram-like diffraction structures. EP 1 879154 A2 describes the use of a multi-layer embossing varnish for embossing a microstructure, all layers being initially arranged one on top of the other without or without complete intermediate drying and then being embossed. The coating is fully cured only after embossing.

It is also known to use pigments to produce a functional layer that can be obtained by printing. WO 2017/211450 A1 describes the use of a printing ink containing platelet-shaped metal pigments for producing a reflection layer.

EP 3392054 A1 describes a security element provided with a liquid crystal material layer, with a relief structure being embossed into the liquid crystal material layer. It has been shown that certain security features for protecting documents of value can only be produced in a manner which, due to the production process, results in irregular contours. Providing a (UV) embossing varnish with embossing structures can often only be carried out in such a way that the varnish is liquid at the time of embossing, which may lead to the formation of bubbles. Furthermore, when embossing layers that are printed in the form of a motif, there is often squeezing, ie the layer is rolled out, which is why fine structuring is not possible. In addition, an undesired non-uniformity of the layer thickness is produced, with the layer thickness frequently decreasing towards the edges. In some cases there are also location-dependent different embossing conditions depending on the position in the motif to be printed. These irregularities are undesirable and must be covered or masked in a later step by a covering, upper layer. For reasons of protection against forgery, the functional layers arranged above a document of value, eg motifs based on effect pigment ink or motifs based on thin-layer systems with a color shift effect, are preferably arranged underneath a protective carrier substrate such as a film. The application of an additional, masking layer to conceal defects in the motif, for example by vaporizing a metallization or by a printing process, would therefore have to take place above the protective carrier substrate. However, vapor-deposited metallizations are sensitive to scratches and must be protected. The production of a masking layer would also require additional work steps and place high demands on the register accuracy to be achieved. Proceeding from this, the object of the invention is to provide a method for producing a security element suitable for protecting a document of value with an improved visual appearance. Another object is to provide a security element with a high level of security against forgery and an attractive visual appearance.

These objects are 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) Method for producing a security element (12) suitable for protecting a document of value (13), comprising a) providing a temporary carrier substrate (1); b) providing the temporary carrier substrate (1) with an embossing lacquer layer (3) into which a relief structure (4) is embossed; c) the typographical application of a functional layer (5) to the embossing lacquer layer (3) in the form of a motif, so that the functional layer (5) adapts to the relief structure (4) on the side facing the embossing lacquer layer (3); d) the application of an opaque layer (6) as a layer adjoining the functional layer (5), the opaque layer (6) masking the functional layer (5), ie overlapping the edge region of the functional layer (5); e) the application of an adhesive layer (7); f) applying a stationary carrier substrate (8) to the adhesive layer (7); and g) removing the temporary carrier substrate (1) from the embossing lacquer layer (3).

2. (Preferred embodiment) Method according to paragraph 1, wherein before step b) a release layer (2) is provided between the temporary carrier substrate (1) and the embossing lacquer layer (3).

3. (Preferred embodiment) Method according to paragraph 1 or 2, comprising as an additional step h) the application of an adhesive layer (10) suitable for gluing the security element (12) to a document of value (13), in particular above the embossing lacquer layer (3).

4. (Preferred embodiment) Method according to one of paragraphs 1 to 3, wherein step c) is followed by the additional step of embossing a further relief structure in the functional layer (5), namely on the side of the functional layer (5) that of the embossing lacquer layer (3) opposite.

5. (Preferred embodiment) Method according to one of paragraphs 1 to 4, wherein the functional layer (5) is a layer containing dyes and/or color pigments and/or effect pigments or a liquid crystal material layer.

6. (Preferred embodiment) Method according to paragraph 5, wherein the functional layer (5) is a liquid crystal material layer doped with at least one dichroic dye.

7. (Preferred embodiment) Method according to one of paragraphs 1 to 6, wherein the opaque layer (6) has a metallization, a color-shifting Thin-layer system with absorber/dielectric/reflector structure or a reflection layer based on platelet-shaped metal pigments.

8. (Preferred embodiment) Method according to one of paragraphs 1 to 7, wherein the relief structure (4) embossed into the embossed lacquer layer (3) in step b) and the optionally present, in the side of the functional layer (3) opposite the embossed lacquer layer (3) 5) the embossed further relief structure is a diffractive structure or a micro-optical structure.

9. (Preferred embodiment) Method according to paragraph 5 or according to one of paragraphs 6 to 8 referring back to paragraph 5, wherein the relief structure (4) embossed into the embossing lacquer layer (3) in step b) and the optionally present relief structure (4) in that of the embossing lacquer layer ( 3) the further relief structure embossed on the opposite side of the functional layer (5) is a structure for aligning the liquid crystal material layer.

10. (Preferred embodiment) Method according to one of paragraphs 1 to 9, wherein the security element (12) is a security strip, a security thread or a patch or label.

11. (Second aspect of the invention) A security element (12) suitable for protecting a document of value (13), comprising

- An embossing lacquer layer (3) into which a relief structure (4) is embossed;

- a functional layer (5) applied by printing in the form of a motif to the embossing lacquer layer (3), the functional layer (5) adapting to the relief structure (4) on the side facing the embossing lacquer layer (3); - An opaque layer (6) adjoining the functional layer (5), the opaque layer (6) masking the functional layer (5), ie overlapping the edge region of the functional layer (5);

- an adhesive layer (7); and

- a stationary carrier substrate (8).

12. (Preferred embodiment) Security element (12) according to paragraph 12, wherein the security element (12) additionally comprises an adhesive layer (10) suitable for gluing the security element (12) to a document of value (13).

13. (Preferred embodiment) Security element (12) according to paragraph 11 or 12, wherein the security element (12) can be obtained by the method according to one of paragraphs 1 to 10.

14. (Third aspect of the invention) Document of value (13), in particular a banknote, comprising a security element (12) according to one of paragraphs 11 to 13.

15. (Preferred embodiment) value document (14) according to paragraph 14, wherein the value document is based on a value document substrate which has a transparent partial area, in particular a recess, in the area in which the security element (12) is arranged.

Detailed Description of the Invention

The document of value mentioned in the present description can be a banknote, in particular a paper banknote, a A polymer banknote or a foil bonded banknote, a stock, a bond, a certificate, a voucher, a check, a high-value admission ticket, but also an identification card, such as a credit card, bank card, cash card, authorization card, ID card or passport personalization page act.

The method according to the invention for producing a security element suitable for protecting documents of value comprises: a) providing a temporary carrier substrate; b) providing the temporary carrier substrate with an embossing lacquer layer into which a relief structure is embossed; c) the typographical application of a functional layer to the embossing lacquer layer in the form of a motif, so that the functional layer adapts to the relief structure on the side facing the embossing lacquer layer; d) the application of an opaque layer as a layer adjoining the functional layer, the opaque layer masking the functional layer, i.e. overlapping the edge region of the functional layer; e) applying an adhesive layer; f) applying a stationary support substrate to the adhesive layer; and g) removing the temporary support substrate from the embossing lacquer layer.

The production of a security element according to the invention takes place on a temporary carrier substrate which is removed in a later method step. A release layer or separating layer can optionally be present between the temporary carrier substrate and the embossing lacquer layer in order to facilitate the detachment of the temporary carrier substrate from the embossing lacquer layer provided with the release layer. In the special case of a multi-layer, for example two-layer, embossing varnish a single embossing lacquer layer performs the function of a release layer. The embossing lacquer layer is preferably UV-curing and can optionally have a multilayer structure, as is known, for example, from EP 1 879 154 A2. The embossing lacquer layer is provided with an embossing in order in this way to provide a relief structure such as a diffractive structure or a micro-optical structure. In a subsequent step, a functional layer is applied by printing in the form of a motif. The functional layer differs from the embossing lacquer layer in particular with regard to the light absorption properties in at least one property. According to a preferred embodiment, the functional layer is UV-curing and can be embossed in the not yet cured state. According to a further preferred embodiment, the functional layer is provided with an embossing in the course of an additional embossing step in order in this way to provide a further relief structure such as a diffractive structure or a micro-optical structure. The functional layer thus has a relief structure on each of its two main surfaces, independently of one another. The relief structure forming a diffractive structure is in particular a hologram structure. The dimensions of the structural elements of the diffractive structure are preferably in the order of magnitude of the light wavelength, more preferably in a range greater than 100 nm and less than 1 pm, with a range greater than 300 nm and less than 1 pm being particularly preferred. Micro-optical relief structures are known in the prior art (see, for example, WO 2014/060089 A2). The dimensions of the structural elements of a micro-optical relief structure are preferably in a range that is greater than lpm and less than 40 pm, with a range greater than lpm and less than 30 pm being particularly preferred. The dimensions of the structural elements of a micro-optical relief structure have, for example, a height of up to 15 μm and a lateral extent of up to 30 μm. Included Both the height and the lateral extent of the structural elements of the micro-optical relief structure are preferably greater than I m.

In particular, in the step of embossing the functional layer, a so-called rolling out occurs, which leads to an unsightly deformation of the functional layer in the edge area. Covering up the unsightly edges is therefore desirable in order to improve the visual attractiveness of the security element. This is accomplished with the help of the opaque layer as a layer adjoining the functional layer, with the opaque layer masking the functional layer, ie overlapping the edge region of the functional layer. The opaque layer thus serves to a certain extent as a kind of optical mask. Depending on requirements, further layers can then be applied, eg a layer with a high index of refraction as a full-surface layer or a partial-surface layer in the form of a motif, which allows embossing to become visible even in non-metallized areas. The production of the security element is completed by arranging an adhesive layer and then a permanent carrier substrate, ie one that remains in the end product. This is followed by separation winding in order to remove the temporary carrier substrate from the layer structure in this way. If necessary, a primer layer is applied to the side of the layer structure on which the temporary carrier substrate was removed. This is followed by the application of an adhesive layer suitable for gluing to a document of value, for example a heat-sealing lacquer. The adhesive layer is preferably applied above the embossing lacquer layer, in particular above the release layer which may be present. In the security element obtained, the opaque layer is protected by the adhesive layer and the permanent carrier substrate. In an optional step, the permanent Carrier substrate are equipped on its free surface with an ink acceptance layer that is suitable for printing with ink. After the security element has been applied to a document of value to be secured with it, the document of value obtained in this way can be printed over its entire surface, for example, including in the area of the security element.

The ink-receiving layer that may be present is in particular a transparent, printable ink layer that can be obtained by printing technology, which is known, for example, from WO 2012/003947 A1. The printing ink for creating the ink-receptive layer is preferably based on a filler, e.g., silica gel, a crosslinker and a binder. Examples of binders used are polyvinyl alcohol, modified polyvinyl alcohol, polyurethane dispersions, acrylate dispersions, and derivatives or mixtures thereof. The crosslinking agent can be selected in particular from the substance class isocyanate, aziridine, carbodiimide or glycidyl ether. Additives, e.g. leveling additives, deaerators and/or monoprotic acids can also be included. Instead of silica gel, a pigment or a mixture of several pigments from the group consisting of boehmite, pseudo-boehmite, zeolite and Al2O3 can be selected as the filler. It can also contain pigments to increase opacity, e.g. TiO?, BaSO4, CaCOs, silicic acids, or polymer-based hollow sphere pigments such as "ROPAQUE" from Rohm & Haas, or effect pigments that create a pearlescent or metallic sheen.

In the simplest case, the opaque layer is a layer that can be obtained by printing and has black pigments. Furthermore, the opaque layer can in particular be a metallization, a color-shifting thin-layer system with an absorber/dielectric/reflector structure or a reflection layer based on platelet-shaped metal pigments. The use of a printing ink containing platelet-shaped metal pigments for producing a reflection layer is known in the prior art, see for example WO 2017/211450 A1. A metallization is preferably provided by vapor deposition, optionally by means of a mask or by using a wash ink. First of all, printing with a soluble wash ink takes place in the form of a desired recess within the reflective layer to be produced, metallization is produced by vapor deposition, and the wash ink is washed off together with the metallization applied above the wash ink. A suitable wash color is described, for example, in EP 1 972462 A2.

Suitable platelet-shaped metal pigments for producing an opaque layer are, for example, 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. 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, printing-related production of the reflective layer makes it possible to dispense with complex process steps, such as printing with a soluble wash ink in the form of a desired recess within the reflective layer to be produced, creating a metallization by vapor deposition and washing off the wash ink together with that above the wash ink applied metallization. The functional layer is preferably a layer containing dyes and/or color pigments and/or effect pigments or a layer of liquid crystal material. More particularly, the functional layer is a liquid crystal material layer doped with at least one dichroic dye. A security element provided with a liquid crystal material layer and having a relief structure embossed into the liquid crystal material layer is known, for example, from EP 3392054 A1. In particular, the dichroic dye can have a functional group which makes it possible to incorporate the dye into the network. An example are dyes with an acrylate head group (which can be incorporated into the network of liquid crystal diacrylates, for example). Furthermore, the dichroic dye can absorb in the visible wavelength range, but also show fluorescence and can be excited with UV light, for example. Liquid crystals by themselves do not show any noticeable light absorption or light reflection. The light absorption is determined by the dichroic dye. For example, fluorescent dyes with polarized fluorescence, such as fluorescent dyes with a 9,10-diphenylanthracene fluorophore or a coumarin fluorophore, are suitable. A blue anthraquinone dye and a red azo dye for incorporation into liquid-crystalline polymer networks are described, for example, in WO 02/37147 A1.

Dichroic dye-doped liquid crystal material layers can be aligned by means of a relief structure, which has several areas with different orientation directions, in order to produce a hidden motif in the dichroic dye-doped liquid crystal material layer in this way, which is visible to the viewer when illuminated with polarized light with the naked eye is recognizable. If the functional layer is provided in the form of a layer containing effect pigments, effect pigments that assume a different shade depending on the viewing angle are particularly suitable. Such effect pigments have, in particular, an interference layer structure which typically comprises a reflection layer, a partially transparent layer or absorber layer and one or more dielectric spacer layers located in between. The dielectric spacer layers are based, for example, on mica, on SiC>2 or on Al2O3. Such interference layers are referred to as single or multi-layer according to the number of dielectric layers. Printing inks with pigments of such thin-film interference layers are marketed, for example, under the name Iriodin® (single-layer) or Colorcrypt® (multi-layer) by Merck KGaA. Printing inks with multilayer interference layer pigments are also marketed by SICPA under the name OVI® (OVI=optically variable ink). A special case are magnetically orientable OVI pigments, which are aligned in a preferred direction by means of a magnetic field during or after the printing of the substrate. A subset of interference layers or interference layer pigments are cholesteric or other liquid crystals that can also be used. These are available, for example, as liquid-crystalline silicone polymers or as pigments in so-called STEP® colors (STEP = Shimmery Twin Effect Protection).

Particular exemplary embodiments and advantages of the invention are explained below with reference to the figures, which are not shown to scale and in proportion in order to improve clarity. Show it:

FIGS. 1 to 6 show an example of the production of a security element according to the invention;

FIG. 7 shows a further example of a device according to the invention

security element; and

FIG. 8 shows a schematic representation of a bank note with a security element according to the invention.

The invention will first be explained in more detail using examples of security elements for protecting banknotes. Figure 8 shows a schematic representation of a banknote 13 with the denomination "20", which is provided with a strip-shaped security element 12. The banknote 13 is based on a paper substrate 11, which is bonded to the strip-shaped security element 12 by means of an adhesive layer, namely a heat-sealing lacquer is.

The structure and production of a security element 12 according to the invention are explained in more detail below in connection with FIGS.

According to FIG. 1, a temporary carrier substrate 1 is first provided, in the example a polyethylene terephthalate (PET) film. An optional release layer 2 and a UV-curing embossing lacquer layer 3 are applied above the temporary carrier substrate 1 . The embossing lacquer layer 3 is then provided with an embossing structure 4, im Example of a diffractive structure. The embossing lacquer layer 3 is then cured by exposure to UV light.

According to FIG. 2, a liquid crystal material layer 5 doped with a dichroic dye is applied in the form of a motif by means of a screen printing process. The liquid-crystalline substance is applied from the melt at elevated temperature. After a certain time, with the temperature being set according to the type of liquid-crystalline material, e.g. in a range from 70°C to 110°C, the liquid-crystalline layer 5 doped with at least one dichroic dye is removed with the aid of the relief structure 4 embossed in the embossing lacquer layer 3 aligned and can be crosslinked by UV radiation.

Before crosslinking by means of UV radiation, the liquid crystal material layer 5 can optionally be embossed, so that the liquid crystal material layer 5 is provided on the side opposite the embossing lacquer layer 3, e.g. with a relief structure formed by a microstructure or a nanostructure.

According to FIG. 3, an opaque layer 6 is applied as a masking layer adjacent to the liquid crystal material layer 5 such that the edges of the liquid crystal material layer 5 are overlapped by the opaque layer 6. FIG. In this way, irregularities at the edges of the liquid crystal material layer 5 are masked or concealed. In the present example, the opaque layer 6 is applied by printing and is based on the printing ink with platelet-shaped metal pigments (in particular Al pigments) known from WO 2005/051675 A2 and leads to produce a reflection layer, in the present case a "silver" mirror layer.

According to FIG. 4, the layer structure obtained is provided with an adhesive layer 7 via an optionally present intermediate layer or primer layer (not shown in the figure) and then with a permanent carrier substrate 8, in the example a polyethylene terephthalate (PET) film.

According to FIG. 5, the temporary carrier substrate 1 is detached from the embossing lacquer layer 3 provided with the optional release layer 2.

According to FIG. 6, the security element is completed by providing the embossing lacquer layer 3 with an optional intermediate layer or primer layer 9 via the optional release layer 2 and then with a heat-sealing lacquer 10 suitable for gluing the security element to a value document substrate 11 .

FIG. 7 illustrates a further example of a security element according to the invention, which is based on the security element shown in FIG. Compared to the security element shown in FIG. 6, the opaque layer in the case of FIG. 7 is formed by a color-shifting thin-layer system. The color-shifting thin-layer system comprises a reflective layer 61, in the example an Al layer, a dielectric layer 62, in the example a SiCb layer, and an absorber layer 63, in the example a Cr layer.

Claims

P atentClaims

1. A method for producing a security element (12) suitable for protecting a document of value (13), comprising a) providing a temporary carrier substrate (1); b) providing the temporary carrier substrate (1) with an embossing lacquer layer (3) into which a relief structure (4) is embossed; c) the typographical application of a functional layer (5) to the embossing lacquer layer (3) in the form of a motif, so that the functional layer (5) adapts to the relief structure (4) on the side facing the embossing lacquer layer (3); d) the application of an opaque layer (6) as a layer adjoining the functional layer (5), the opaque layer (6) masking the functional layer (5), i.e. overlapping the edge region of the functional layer (5); e) the application of an adhesive layer (7); f) applying a stationary carrier substrate (8) to the adhesive layer (7); and g) removing the temporary carrier substrate (1) from the embossing lacquer layer (3).

2. The method according to claim 1, wherein before step b) a release layer (2) is provided between the temporary carrier substrate (1) and the embossing lacquer layer (3).

3. The method according to claim 1 or 2, comprising as an additional step h) the application of an adhesive layer (10) suitable for bonding the security element (12) to a document of value (13), in particular above the embossing lacquer layer (3).

4. The method according to any one of claims 1 to 3, wherein step c) is followed by the additional step of embossing a further relief structure in the functional layer (5), namely on the side of the functional layer (5) opposite to the embossing lacquer layer (3). lies.

5. The method according to any one of claims 1 to 4, wherein the functional layer (5) is a layer containing dyes and/or color pigments and/or effect pigments or a liquid crystal material layer.

6. The method according to claim 5, wherein the functional layer (5) is a liquid crystal material layer doped with at least one dichroic dye.

7. The method according to any one of claims 1 to 6, wherein the opaque layer (6) is a metallization, a color-shifting thin-layer system with an absorber/dielectric/reflector structure or a reflection layer based on platelet-shaped metal pigments.

8. The method according to any one of claims 1 to 7, wherein the relief structure (4) embossed into the embossing lacquer layer (3) in step b) and the optionally present further embossed into the side of the functional layer (5) opposite the embossing lacquer layer (3). Relief structure is a diffractive structure or a micro-optical structure.

9. The method according to claim 5 or according to one of claims 6 to 8 dependent on claim 5, wherein the relief structure (4) embossed into the embossing lacquer layer (3) in step b) and the optionally present side opposite the embossing lacquer layer (3). the Functional layer (5) embossed further relief structure is a structure for aligning the liquid crystal material layer.

10. The method according to any one of claims 1 to 9, wherein the security element (12) is a security strip, a security thread or a patch or label.

11. A security element (12) suitable for securing a document of value (13), comprising

- An embossing lacquer layer (3) into which a relief structure (4) is embossed;

- a functional layer (5) applied by printing in the form of a motif to the embossing lacquer layer (3), the functional layer (5) adapting to the relief structure (4) on the side facing the embossing lacquer layer (3);

- an opaque layer (6) adjoining the functional layer (5), the opaque layer (6) masking the functional layer (5), i.e. overlapping the edge region of the functional layer (5);

- an adhesive layer (7); and

- a stationary carrier substrate (8).

12. The security element (12) according to claim 12, wherein the security element (12) additionally comprises an adhesive layer (10) suitable for gluing the security element (12) to a document of value (13).

13. The security element (12) according to claim 11 or 12, wherein the security element (12) can be obtained by the method according to any one of claims 1 to 10. - 21 -

14. Document of value (13), in particular a bank note, comprising a security element (12) according to one of claims 11 to 13.

15. Document of value (14) according to claim 14, wherein the document of value is based on a document of value substrate which has a transparent partial area, in particular a recess, in the area in which the security element (12) is arranged.