EP4334138A1

EP4334138A1 - Method for producing a security element, and security element

Info

Publication number: EP4334138A1
Application number: EP22717729.2A
Authority: EP
Inventors: Veronika ZINTH; Christoph Mengel; Yana Kisselova-Weckerle; Astrid DREXLER; Bernhard WEDNER; Andreas Gross; Simon Freutsmiedl; Elisabeth WÄSCHE; Florian Schmitt; Simone THALBAUER
Original assignee: Giesecke and Devrient Currency Technology GmbH
Current assignee: Giesecke and Devrient Currency Technology GmbH
Priority date: 2021-05-06
Filing date: 2022-03-21
Publication date: 2024-03-13
Also published as: DE102021002416A1; WO2022233449A1

Abstract

The invention relates to a method for producing a security element, to a security element, and to a security document. The method comprises the following steps: providing a substrate (12) embodied with a planar extent and having a front and a rear side (14, 15) and at least one portion (16); b1) applying a stabilizing coating (17) in the portion (16) on the rear side (15) of the substrate (12); b2) applying an adhesion promoter coating (18) in the portion (16) on the front side (14) of the substrate (12); and c) applying a transfer element (19) on the adhesion promoter coating (18). As seen in a plan view of the planar substrate (12), the transfer element (19) is arranged in a manner bounded by an edge (22) lying within the portion (16) on at least a first and a second side (20, 21), and the stabilizing coating (17) and the adhesion promoter coating (18) are each formed on at least one of the first and second sides (20, 21) of the transfer element (19) in a manner extending beyond the edge (22) thereof. The stabilizing coating (17) and the adhesion promoter coating (18) each comprise a, more particularly optical or machine-readable, e.g. luminescent, feature component, the stabilizing coating (17) and the adhesion promoter coating (18) jointly forming a security feature of the security element.

Description

Method of making one

security element and

The invention relates to a method for producing a security element, a security element and a security document.

WO 2014/095039 A1 describes a continuous, windowless sheet of security paper that is provided with a stabilization coating.

EP 2461970 B1 describes a production process for security paper and a security paper obtainable with it, a window opening being provided which is covered by a film. A stabilization coating is provided around this opening for stabilization.

DE 102019005551 A1 describes a method for producing security paper, in which a stabilization coating is applied to the back and a transfer element is applied to the front of a continuous section of a paper substrate. The stabilization coating can cover less than 98% of the area of the transfer element in plan view and/or extend beyond the transfer element.

The invention is based on the object of specifying an efficient method for producing a security element and a security element, with which the counterfeit security of the security element is promoted at the same time.

The invention is defined in the independent claims. The dependent claims relate to preferred developments. The method for producing a security element with a security feature comprises the following steps. providing a sheet-like stretched substrate having a front and a back and at least one portion; applying a stabilizing coating to the backside portion of the substrate; applying an adhesion promoter coating in the front side portion of the substrate; and applying a transfer element to the adhesion promoter coating. Seen in a plan view of the planar substrate, the transfer element is arranged delimited on at least a first and a second side by an edge lying within the section. The stabilization coating and the adhesion promoter coating are each formed on at least one of the first and second sides of the transfer element, extending beyond its edge. According to the present solution, the stabilization coating and the adhesion promoter coating each comprise a feature component, in particular an optical or machine-readable feature component. The stabilization coating and the adhesion promoter coating with their feature components together form the security feature. The method produces a security element in which an optical or machine-readable feature component of the stabilization coating is combined with an optical or machine-readable feature component of the adhesion promoter coating to form a security feature. In this way, the protection against counterfeiting of the security element is optimized. The reuse of the two selected functional coatings simplifies production, but at the same time increases the security of the security element. The ability to rework is made more difficult by the integration of the transfer element. In addition, the detachability of the transfer element is ensured by the adhesion promoter coating. difficult and recognizable in the case of a successful detachment by the destruction of the adhesion promoter layer.

The stabilization coating and/or the adhesion promoter coating are particularly preferably formed so as to reach beyond the edge of the transfer element. In this case, for example, the stabilization coating on the first and second sides of the transfer element can extend beyond its edge. Alternatively, the stabilization coating can only extend beyond its edge on one of the two sides, ie in particular not extend beyond at least the second side. Simultaneously or alternatively, the adhesion promoter coating on the first and the second side of the transfer element can extend differently beyond its edge or only on the first side beyond its edge, i.e. in particular not on the second side.

The stabilization coating and/or the adhesion promoter coating can (each) be formed with at least one pattern. The pattern can be different. The stabilizing coating preferably has at least one first pattern and the adhesion promoter coating has at least one second pattern.

The stabilization coating preferably comprises a first, in particular optically effective or machine-readable, feature component and the adhesion promoter coating comprises a second different, in particular optically active or machine-readable, feature component.

The asymmetrical arrangement and/or the pattern can be used to design the optical security feature that is visible to the viewer or machine-readable. It should be noted that by a pattern in the corresponding coating only optionally an asymmetrical arrangement arises. For example, if the same pattern is placed symmetrically on either side of the rim, or a pattern is placed within the rim, the array extending beyond the rim will remain symmetric.

The stabilization coating and the adhesion promoter coating can therefore have the same pattern and different feature components, different patterns and the same feature components, or preferably different patterns and different feature components. In each of these cases, the stabilization coating and the adhesion promoter coating could both be arranged symmetrically to the transfer element, only one could be arranged asymmetrically, or both could be arranged asymmetrically.

Analogously, the stabilization coating and/or the adhesion promoter coating can be arranged symmetrically and have different feature components, (one or both) can be arranged asymmetrically and have the same feature components, or preferably arranged differently asymmetrically and have different feature components. In each of these other cases, the stabilizing coating and/or the adhesion promoter coating could have patterns. Since the two coatings are on different sides of the transfer element, security features can be created for a wide variety of viewing and lighting situations (top view/through view/front/back). The stabilizing coating and the adhesion promoter coating are preferably arranged in register with one another in at least one direction—preferably in two mutually perpendicular directions. Alternatively or additionally, the stabilization coating and/or the adhesion promoter coating can be formed in register in at least one direction—preferably in two mutually perpendicular directions—to the transfer element and/or to a pattern of the substrate, such as a watermark. The feature components of the two coatings can be optically effective or machine-readable feature components for the viewer. An optically effective feature component is visible to the viewer when irradiated, in particular in the UV range, in the visible range or in the IR range. It is preferably only visible to the viewer when irradiated in the UV range or IR range, ie in particular either transparent in the visual range or designed in the color of the (paper) substrate. A machine-readable component is preferably only mechanically recognizable, in particular magnetically recognizable or, upon irradiation, for example in the UV range, in the visible range or in the IR range, only spectrally recognizable by machine. For example, when illuminated in one of the ranges (IR, VIS, UV), the feature component can be excited to emit one or more specific wavelengths (luminescence) or reflect the radiation unchanged, optionally only reflect selectively for one or more specific wavelengths .

The security feature is particularly preferably an optical security feature that is visible to the viewer, preferably with both patterns. In this case, the security feature in a predetermined viewing situation, preferably a predetermined viewing and lighting side, being visible. For example, the security feature is visible in reflected light and/or in transmitted light from one viewing side, optionally from both viewing sides. Alternatively, the security feature can be perceptible to the viewer with a change of viewing and/or lighting side. By changing the viewing side (front/back) and/or the lighting side (reflected light/transmitted light), the different optical effects of the two feature components and/or their different patterns become recognizable.

Since the adhesion promoter coating and the stabilization coating are on opposite sides of the substrate, only the pattern on the illuminated side of the security element is visible, for example when viewed in incident light (and a paper substrate with correspondingly low translucency). For example, only the fluorescent pattern of the illuminated side is visible in UV reflected light if the paper substrate absorbs the UV radiation (or the luminescent radiation of the opposite side). On the other hand, when the paper is illuminated with light, e.g. also with UV light, both patterns, e.g. the UV-fluorescent patterns, can become visible on both sides of the security element and the patterns of the adhesion promoter coating and the stabilization coating complement each other. Mixed colors can also be observed in the area of overlapping colored, in particular fluorescent, patterns of the adhesion promoter coating and the stabilization coating on the front and back of the security element.

The security feature formed by the two coatings can be a machine-readable security feature, which is preferably machine-readable with a single measurement step. In particular, neither the Measurement and / or lighting side are changed, a separate measurement of the feature components are made to capture the effect of the two feature components. Alternatively, the security feature could also only be machine-readable with several, preferably simultaneous, measuring steps of different types or different measuring situations, in particular the measuring and/or lighting side.

The authenticity of the security element can thus be checked by the viewer using the optically effective security feature or by the checking machine using the machine-readable security feature.

In the particularly preferred embodiment, the stabilization coating and/or the adhesion promoter coating are applied outside the edge with its at least one pattern.

The transfer element can have opaque areas and only optionally have transparent or translucent areas. Configurations with two patterns lying outside the edge are therefore particularly advantageous, in particular in cases in which the transfer element has opaque areas or because it is independent of the presence/position of the opaque area. Alternatively or additionally, the at least one pattern of the stabilization coating and/or the adhesion promoter coating can be formed within the edge. An embodiment with a pattern lying within the edge is particularly advantageous for transparent or translucent transfer elements or when arranged in a transparent or translucent area of the transfer element.

The transfer element is usually as a strip, which extends in particular re over an entire length or width of the substrate, or as Patch, which only extends locally, be designed. The transfer element has a basic shape, the basic shape being in particular a geometric basic shape, in particular a rectangle, circle, polygon or regular n-gon, or a motif-like basic shape. As a strip, the transfer element is bounded on exactly two sides by its two edges. As a patch, it is bordered on the two sides by two sections of its peripheral border.

The transfer element is preferably an optically variable transfer element with more than two transfer element layers. An adhesive layer as a transfer element layer connects the transfer element (permanently) to the adhesive coating. Further transfer element layers can be in particular: a relief structure layer, in particular an embossing lacquer layer with an embossed relief structure, and/or a reflection-increasing layer, which in particular follows the relief of the relief structure layer, and/or a color-shifting transfer element layer, which in particular comprises at least one electrical layer or comprises a layer with color-shifting pigments, and/or a machine-readable feature layer, in particular with an IR feature, a phosphorescent feature or a magnetic feature; and/or a carrier layer, in particular made of paper or plastic, which is preferably transparent. Any combination of the individual transfer element layers is intended for transfer elements. The transfer element will have an adhesive layer, which is preferably a thermally activatable or steel-hardening adhesive layer. The transfer element can have its own carrier layer, in particular carrier film. Alternatively, the transfer element is carrier-free. When applied to the adhesion promoter coating, the transfer element—with or without its own carrier film—is generally transferred as an element from an intermediate carrier to the coated substrate. The adhesion promoter coating promotes the adhesion of the trans- ferelements on the substrate. Adhesion promoter coatings are also referred to as primer coatings. They are well known and should not be confused with the adhesive layer that connects the transfer element to the substrate.

5

The adhesion promoter component of the adhesion promoter coating is therefore only discussed as an example. The adhesion promoter coating can contain at least one or more identical or different elements selected from a polyurethane, an acrylate, an isocyanate, an epoxy, an aziridine, a carbodiimide and any other

Combination thereof, in particular an aqueous polyurethane and/or acrylate dispersion. The isocyanate, the epoxide, the aziridine and/or the carbodiimide can be used as crosslinkers for the aqueous polyurethane and/or acrylate dispersion. In this way, in particular, the starting materials for a lacquer material can be provided.

The stabilization coating per se is also well known in terms of its purpose and design. For example, reference can be made to EP 2461970 B1 and in particular to the formation as a crosslinked lacquer layer. The stabilization coating maintains the flatness of the substrate, in particular during the application of the transfer element and/or during later printing steps, such as banknote printing, in particular intaglio printing (steel engraving). If the transfer element is applied or, in the case of banknote printing, intaglio printing is carried out, a compressive force is applied to the front side of the substrate with the transfer element, which counteracts the stabilizing coating by means of a counterforce. A possible stabilization component of the stabilization coating is therefore only briefly discussed as an example. The stabilization coating can have at least one or more identical or different contain different elements selected from a polyurethane, an acrylate, an at least partially, preferably completely, UV-curable material and any combination thereof, in particular an aqueous polyurethane and/or acrylate dispersion. It is also possible to use 100% UV-curable mixtures, aqueous UV-curable mixtures and dual-cure mixtures, for example mixtures that can be cured with UV light and a crosslinking agent.

The transfer element has a basic shape defined by the two-sided or peripheral edge of the transfer element. As a rule, the edge is linear or circular, i.e. the basic shape is an n-corner, rectangle or circle. However, transfer elements with a motif-like basic shape, such as apple-shaped patches or strips with round or angular bulges, are also known. Since the two coatings are applied functionally for the transfer element, they are applied at least oriented to the basic shape of the transfer element. DE 102019005551 A1 shows corresponding examples of the stabilization coating.

The asymmetrical arrangement already described (reaching over the edge in different ways) of one or both coatings can be designed independently of or depending on the basic shape. Thus, for example, around a transfer strip (with a straight edge), the sections (with a straight edge) of the (stabilizing or adhesion promoter) coating that reach over the edge in strip form on both sides can have different widths. Alternatively, for example, a transfer strip (with a straight edge) could be provided with an elongated oval or elongated cloud-shaped (stabilizing or adhesion promoter) coating in plan view. Furthermore (or also in the sense of the last alternative) one of the two or both coatings can be applied with at least one independent pattern—independent of the basic shape of the transfer element. The pattern(s) of the (both) coating(s) can alternatively or additionally comprise repeating pattern elements. Also alternatively or additionally, a geometric, character-like (letter(s), number(s), symbol(s)) or motif-like recess in the corresponding coating can serve as a pattern. Furthermore, the at least one pattern of one or both coatings can comprise (optionally separate) geometric, character-like (letter(s), number(s), symbol(s)) or motif-like pattern elements, which are preferably separate from the further section (s) of the corresponding coating are arranged.

The two coatings each extend with their areas FS and FH, area FS of the stabilization coating outside the edge and area FH of the adhesion promoter coating outside the edge, beyond the edge of the transfer element. The larger surface (FS or FH) of the two surfaces (FS, FH) of the coatings extending beyond the edge is at least 1.2 times larger than the (other of the two) smaller surface (FH or FS). So FS > 1.2*FH or FH > 1.2*FS applies. Preferably, the larger area is between 1.2 and 8 times larger than the smaller of the two areas. Then either 8*FH > FS > 1.2*FH or 8*FS > FH > 1.2*FS applies. More preferably, the larger area is between 1.25 and 4 times larger. Accordingly, either 4*FH > FS > 1.25*FH or 4*FS > FH > 1.25*FS applies.

Particularly preferably, the stabilization coating and the adhesion promoter coating overlap when viewed from above on the planar substrate, but at least partially do not overlap outside the edge. Preferably, in transmitted light or in a fuminescence excitation light, a first Motif of the stabilization coating and a second motif of the adhesion promoter coating simultaneously visible to the viewer. The two patterns preferably complement each other to form an overall motif that is optionally repeated in one direction, or to form a continuous motif.

In advantageous configurations, the stabilization coating and/or the adhesion promoter coating are printed on, in particular by means of screen printing, optionally by means of offset printing, gravure printing or flexographic printing. The two coatings can be applied in one operation, so the coatings and their patterns are in register with each other. The two coatings can also be applied in two operations in register with one another, in particular with two or more than two patterns that are in register with one another—at least in one direction. These measures promote the efficiency of the process and reduce its costs. The stabilization coating is preferably applied before the transfer element. The stabilization coating can be applied before the primer coating and before the transfer element, or it can be applied after the primer coating and before the transfer element. It is only conceivable as an alternative to apply the stabilization coating after the adhesion promoter coating and after the transfer element.

The stabilization coating comprises a stabilization component and may comprise less than 10% of the (first) feature component, in particular between 0.1 to 10%, more preferably between 0.1 to 3% of the first feature component. The adhesion promoter coating comprises an adhesion promoter component and preferably less than 10% of a (second) feature component, in particular between 0.1 to 10%, more preferably between 0.1 to 3% of the second feature component. the stabilization The coating or the adhesion promoter coating can also contain less than 10% of a further (third or fourth) feature component, in particular between 0.1 to 10% or 0.1 to 5%, more preferably between 0.1 to 3%. The sum of the proportions of the first and third or second and fourth feature components in the respective coating is preferably less than 10%. The percentages relate to parts of the dry weight in the applied state.

In all configurations, the stabilization coating and/or the adhesion promoter coating can extend over more than 50%, preferably less than 98%, over the surface of the transfer element, as is described in more detail in DE 102019005551 A1, for example.

In particularly preferred embodiments, the feature components of the stabilization coating and the adhesion promoter coating are both luminescent feature components. The luminescent feature components can be luminescent, preferably fluorescent or phosphorescent, colorants, which are preferably present as luminescent dyes or as luminescent pigments. The luminescent feature components can each range in different spectral ranges, be excitable, in particular in the UV range and in the IR range, or both be excitable in the same spectral range, in particular in the UV range or in the IR range. The luminescent feature components can be excitable separately from one another and/or together, in particular with non-overlapping, partially overlapping or with overlapping excitation bands. The (paper) substrate can be translucent for the excitation light or contain an excitation light absorber, such as a UV or IR absorber. The stabilization coating and/or the The adhesion promoter coating can contain (additionally) an excitation light absorber, such as a UV or IR absorber, as a further component.

In other advantageous configurations (or in addition), at least one of the feature components of the stabilization coating and the adhesion promoter coating can be an optically variable feature component. The optically variable feature component, in particular a pigment or dye, is an iridescent feature component (e.g. pigment that shimmers in rainbow colors), a specularly reflecting feature component (e.g. platelet-shaped, specularly reflecting pigment, preferably magnetically alignable) or a color-shifting feature component (interference pigment or diffractive effect pigment). The optically variable pigments can, for example, be platelet-shaped and/or be iridescent pigments. In particular, these pigments may be flakes coated or coated with metal oxide (e.g

mica flakes). Layers with such pigments are also frequently referred to as Iriodin coatings or layers. One can also speak of an Iriodin color. The application of paints with such pigments is described, for example, in EP 0490825 A1 and EP 2454413 B1, the content of which is incorporated herein by reference.

The optically variable feature component of the stabilization coating or the adhesion promoter coating can advantageously differ from at least one optically invariable feature component of the other coating, which is formed in particular by a color-stable colorant and/or luminescent colorant and/or a matting agent. In alternative (or supplementary) configurations, at least one of the feature components of the stabilization coating and the adhesion promoter coating is a magnetic feature component or the stabilization coating and/or the adhesion promoter coating additionally comprises a further, magnetic feature component. The stabilization coating and/or the adhesion promoter coating with the magnetic feature component are preferably applied in such a way that a magnetic code can be read. The stabilization coating and the adhesion promoter coating can contain the same magnetic feature component, in particular with low or high magnetic strength, or each comprise different magnetic feature components, in particular with low magnetic strength in one and with high magnetic strength in the other of the two coatings. In this way, both coatings can be combined to form a common, magnetically testable security feature.

In further configurations, at least one of the feature components of the stabilization coating and the adhesion promoter coating is a coloring feature component (or additionally: the stabilization coating and/or the adhesion promoter coating additionally comprises a further coloring feature component). The color-imparting feature component(s) can be a semitransparent colorant, such as dyes or color pigments, in particular pigments with variable or constant color. The coloring feature component(s) of the two coatings can be of different colors. The colors of the coloring

Feature component(s) are preferably visible in transmitted light, with a mixed color resulting in transmitted light, in particular—if the stabilization coating and adhesion promoter coating overlap. The adhesion promoter coating preferably extends beyond the edge of the transfer element by 0.5 to 24 mm, preferably by 1 to 12 mm, as seen in a plan view of the flat substrate. The same initially applies to the stabilization coating. In a plan view of the flat substrate, an area of the adhesion promoter coating or the stabilization coating that extends beyond the edge of the transfer element corresponds to less than 150% of the area of the transfer element, preferably less than 100%, more preferably between 5% and 95%. Seen in a plan view of the planar substrate, a surface of the adhesion promoter coating that extends beyond the edge of the transfer element can be larger than the surface of the stabilization coating that reaches out; this variant is particularly advantageous because it has a smaller layer thickness. The adhesion promoter coating and the stabilization coating are only provided locally in the section of the transfer element. They each cover less than 50% of the front and back of the substrate.

In the section, at least in the area of the transfer element, the substrate can contain an element selected from a reduced thickness, a varying thickness, a reduced thickness forming a substrate pattern, a varying thickness forming a substrate pattern, a window or a hole, and any combination thereof. The substrate is particularly translucent in the visual range and/or UV/IR range, ie not transparent and not opaque but semi-transparent. The substrate is preferably a paper substrate. A thinning of the substrate provided in this way in the region of the transfer element and beyond is advantageous since the substrate then becomes more translucent. In addition, the thinning of the substrate can also be modulated or configured figuratively. This allows the impression of the security element to remain the same, for example under UV lighting, when viewed in the respective reflected light, however, because of the varying thickness of the substrate, especially when a UV absorber is present in the substrate, a different additive color mixture results when UV activation occurs from the opposite side. In addition, a transfer element with its own carrier layer can be combined with a window or a hole in the substrate.

In addition to the stabilization coating with its first (and possibly third) feature component and the adhesion promoter coating with its second (and possibly fourth) feature component, a further stabilization or adhesion promoter coating with a further (fifth) feature component can be applied in the section on the Substrate applied to who. The additional stabilization or adhesion promoter coating is, in particular, an additional stabilization coating with the same stabilization component or an additional adhesion promoter coating with the same adhesion promoter component. The additional stabilization or adhesion promoter coating can also be printed in the aforementioned one operation or in one of the two aforementioned operations. The additional stabilization coating is applied to the back of the substrate or the additional adhesion promoter coating to the front of the substrate in a third or fourth pattern, preferably in certain areas, in particular in strips. Areas of the additional stabilization or adhesion promoter coating can be surrounded by the stabilization or adhesion promoter coating on at least two sides, preferably on exactly two sides or completely. The further stabilization or adhesion promoter coating is also applied both within the edge of the transfer element and beyond it, as seen in plan view. Optionally, a sixth, optical or machine-readable, feature component could be applied, in particular printed, to the stabilization coating with its first (and third) feature component or to the adhesion promoter coating with its second (and fourth) feature component. These measures increase the variety of design options for the security element.

In at least one area of the section of the substrate, a multi-layer structure is formed, which has four layers arranged one on top of the other, namely the stabilization coating, the substrate, the adhesion promoter coating and the transfer element. The layers are arranged in such a way that the substrate is located at least partially, preferably completely, between the stabilization coating and the adhesion promoter coating and is enclosed in this area, in particular over a large area.

The pattern of the stabilization coating and the pattern of the adhesion promoter coating can be designed and/or arranged as follows, particularly when viewed from above on the planar substrate: at least partially, preferably completely, matched to one another; at least partially, preferably completely, complementing one or more motifs, in particular in transmitted light; at least partially, preferably fully, non-overlapping; and/or at least partially, preferably completely, overlapping. Alternatively or additionally, the pattern of the stabilization coating and the pattern of the adhesion promoter coating can form a security feature, selected from a common front/back side feature, a common incident light/transmitted light feature or a common transmitted light feature. The pattern of the stabilization coating and/or the pattern of the adhesion promoter coating can be formed at least partially, preferably completely, outside the edge on one or more sides of the transfer element and/or on the same or different sides of the transfer element, seen in a plan view of the flat substrate. In this way, a large variety of variants of the security element can be produced. The pattern or patterns can be formed, for example, by means of gaps in the stabilization coating and/or in the adhesion promoter coating. For example, the stabilization coating and/or the adhesion promoter coating can

Pattern on one or both sides of the transfer element one or more motif elements, one or more numbers, one or more digits, one or more letters or a currency symbol and any combination thereof. A full-area pattern of the stabilization coating and/or the adhesion promoter coating, in particular also under the transfer element, for example a pattern with recessed numbers, can be formed.

Just for the sake of clarification, it is once again stated that production-related fluctuations - regardless of the specific size - are individual for each security element and are therefore not a security feature in the present sense.

The present security element, in particular in the form of security paper or a banknote, is preferably produced using a method according to one of the preceding aspects. The security element comprises: an areally extended substrate which has a front side and a back side and at least one section; a stabilizing coating in the backside portion of the substrate; an adhesion promoter lamination in the front side portion of the substrate; and a transfer element on the primer coating. Seen in a plan view of the planar substrate, the transfer element is delimited on at least a first and a second side by an edge lying within the section. The stabilization coating and the adhesion promoter coating are each formed on at least one of the first and second sides of the transfer element, extending beyond its edge. The stabilization coating and the adhesion promoter coating each comprise a feature component, in particular an optical or machine-readable feature component. The stabilization coating and the adhesion promoter coating together form the security feature. In particular, the two coatings are arranged or provided with a pattern and the feature components are selected in such a way that an optical or a machine-readable security feature is created that is perceptible to the viewer.

The security element is particularly suitable for improving the security against forgery of security papers for banknotes, but also for other documents of value, such as identity cards, passports, etc.. The substrate is preferably paper, particularly preferably banknote paper, for example as a paper web or sheet of paper . Theoretically, however, substrates made of polymers or composite products, such as hybrid composites, such as foil-paper composites or foil-foil composites, can also be used. However, the present solution is actually only relevant if the plastic or composite substrate is exceptionally so soft (in particular stretchable and deformable) that the transfer element, which for example comprises a carrier layer that is less stretchable or deformable compared to the composite, requires the use of a Stabilization coating on the back to maintain the flatness of the substrate makes necessary. The substrate can be a single-layer or multi-layer substrate.

In another method for producing a security element with a security feature, the method comprises the following steps. providing a planar extended substrate which has a front side and a back side and at least one section; applying a stabilizing coating to the backside portion of the substrate; applying an adhesion promoter coating in the section on the front side of the substrate; and applying a transfer element to the primer coating. Seen in a plan view of the flat substrate, the transfer element is delimited on at least a first and a second side by an edge lying within the section. The stabilization coating and the adhesion promoter coating are each formed on at least one of the first and second sides of the transfer element, extending beyond its edge. According to the present solution, the stabilization coating and the adhesion promoter coating each comprise a feature component, in particular an optical or machine-readable feature component. The stabilization coating and the adhesion promoter coating with their feature components each form an independent security feature. One of the two coatings, in particular the adhesion promoter coating, preferably forms an optical security feature and the other of the two coatings, correspondingly in particular the stabilization coating, forms a machine-readable security feature.

The security element, in particular in the form of a security paper or a bank note, which is preferably produced using the other method, comprises: an areally extended substrate which has a front and a back side and at least one portion; a stabilizing coating in the backside portion of the substrate; an adhesion promoter coating in the front side portion of the substrate; and a transfer element on the primer coating. In a top view of the flat substrate, the transfer element is delimited on at least a first and a second side by an edge lying within the section, and the stabilization coating and the adhesion promoter coating each extend beyond the edge of the transfer element on at least one of the first and second sides educated. The stabilization coating and the adhesion promoter coating each comprise a feature component, in particular an optical or machine-readable one. The stabilization coating and the adhesion promoter coating with their feature components each form an independent security feature. One of the two coatings, in particular the adhesion promoter coating, preferably forms an optical security feature and the other of the two coatings, correspondingly in particular the stabilization coating, forms a machine-readable security feature.

The other method or the security element with the independent security features increases the number of security features provided and in particular their variety (but without using the advantages of a common security feature).

The security element can be obtained or obtained using a method according to one of the above embodiments and modifications. The security element can also have the features and configurations of the security element obtained and obtainable by the measures of the method of the above embodiments and modifications. The same features, advantages and effects can be realized with the embodiments and modifications of the security element as with the method for producing a security element of the above embodiments and modifications, in particular with identical and/or analogous features.

A further embodiment relates to a security document, in particular a bank note, having a security element according to one of the embodiments and modifications described here.

The invention is explained in more detail below using exemplary embodiments with reference to the accompanying drawings, which also disclose essential features of the invention. These exemplary embodiments are for illustrative purposes only and are not to be construed as restrictive. For example, a description of an embodiment having a plurality of elements or components should not be construed as implying that all of those elements or components are necessary for implementation. Rather, other embodiments may include alternative elements and components, fewer elements or components, or additional elements or components. Elements or components of different exemplary embodiments can be combined with one another unless otherwise stated. Modifications and variations that are described for one of the embodiments can also be applicable to other embodiments. To avoid repetition, the same or corresponding elements in different figures are marked with the same reference numbers and are not explained more than once. In the figures show: 1 schematically shows a cross-sectional view of an exemplary security element obtainable with the method of embodiments,

2 schematically shows a cross-sectional view of an exemplary security element obtainable with the method of embodiments,

3 schematically shows a cross-sectional view of an exemplary security element obtainable with the method of embodiments,

4 schematically shows a cross-sectional view of an exemplary security element obtainable with the method of embodiments,

5 schematically shows a cross-sectional view of an exemplary security element obtainable with the method of embodiments,

6 schematically shows a cross-sectional view of an exemplary security element obtainable with the method of embodiments,

7 schematically shows a cross-sectional view of an exemplary security element obtainable with the method of embodiments,

8a and 8b schematically show the security element of FIG. 7 in incident light and in transmitted light, FIGS. 9a to 9c each schematically show a top view of the security element of FIG. 7, in a view in transmitted light, a view of the front of the security element/ Substrate in reflected light and a view of the back of the security element/substrate in reflected light, and Fig. 10 schematically steps of the method of embodiments.

Exemplary embodiments are described below, with the differences between the exemplary embodiments being explained in particular.

FIG. 1 schematically represents a cross-sectional view of an exemplary security element 10 obtainable with the method of embodiments, steps a) to c) of which are illustrated in FIG. 10 with steps S1 to S3.

In step a), an elongated, flat, rectangular substrate 12 with two long and two short sides and a rear side 15 and a front side 14 is provided (step S1 of FIG. 10). The (paper) substrate 12 has a section 16 in which, in step b), a stabilization coating 17 is applied to the rear side 15 of the substrate and an adhesion promoter coating 18 is applied to the front side 14 of the substrate (step S2 of FIG. 10). . In step c), a transfer element 19 with its adhesive layer is applied to the adhesion promoter coating 18 (step S3 of FIG. 10). So in section 16, for example, an optically variable strip as

Transfer element applied, which connects the long sides of the rectangular substrate 12 in section 16 and which itself can already have a large number of un ferent security features. In the present example, the stabilization coating 17 and the adhesion promoter coating 18 are printed on in step b), preferably applied by means of screen printing, either in two or in one operation. With just one work step, the quality for processing and circulation is promoted at the same time and an optical safety feature generated. In examples in which several printing units are used, eg one printing unit for the stabilization coating and another printing unit for the adhesion promoter coating, the printing units can be controlled in the longitudinal direction with an averaged printed register mark. The register mark can be recognized and read with an optical scanning in reflection. In order to enable the printing units to be synchronized, the circumferential position of the respective printing unit can be determined. This can be done using a scanning device on the side screen holder. The same register mark can be used for applying the transfer element if this step is done in a separate operation on a separate machine.

In section 16, an optically variable multilayer structure is formed overall from the stabilization coating 17, the substrate 12, the adhesion promoter coating 18 and the transfer element 19, as can be seen from FIG. The stabilization coating 17 contains, for example, 80-95% of a conventional stabilization component and, in addition, a fluorescent dye with a dry weight content of approximately 1%. It is formed, for example, with a width of 21 mm. As an adhesion promoter coating 18, a standard primer, which is also less than 10%, in particular

2% fluorescent dye is used. The adhesion promoter coating 18 is applied with a width of 18 mm, for example. The fluorescent dyes of the two coatings 17, 18 differ, preferably in their emission color, for example red-emitting in the adhesion promoter coating 18 and blue-emitting in the stabilization coating 17. Both fluorescent dyes preferably appear transparent in the visible range (or have the color of the substrate). A transfer strip with a constant width of 14 mm is provided as the transfer element 19 . It includes sub-layers that are not shown, in particular Specially an adhesive layer, a relief structure layer with a reflection-increasing layer designed in certain areas, and a foil layer. Since the figures are very schematic, it should be noted that the multi-layer transfer element 19 is significantly thicker (> 10-20 gm) than the adhesion promoter layer 18, whose maximum thickness is more in the single-digit gm range (e.g. 0.25 gm to 5 gm ) is, or the stabilization coating 17, the thickness of which is at most in the low two-digit gm range (approx. 2 gm to 20 gm or 2-6 gm). The stabilization coating 17, the adhesion promoter coating 18 and the transfer element 19 are positioned on the substrate 12 in such a way that the distance to the nearest short side of the substrate 12 is at least 25 mm.

In a plan view of the flat substrate, the transfer element 19 is delimited by an edge 22 on at least a first and a second side 20, 21 and is arranged in step c) with its edge 22 lying within the section 16 on the adhesion promoter coating 18. The stabilization coating 17 is arranged in step b) in such a way that, after the transfer element 19 has been applied in step c), it extends beyond the edge 22 on the first and the second side 20, 21 of the transfer element 19. In the example from FIG. 1, the stabilizing coating 17 extends in strips on both sides by 3.5 mm over the edge. The adhesion promoter coating 18 is arranged in step b) in such a way that, after the transfer element 19 has been applied, it extends beyond the edge 22 of the transfer element 19 on the first and second side 20, 21 thereof. In the example from FIG. 1, the adhesion promoter coating 18 extends in strips on both sides by 2 mm over the edge.

Here, the stabilization coating 17 and the Haftvermittlerbe coating 18 can optionally be formed with two patterns 30, the after step c), ie after the application of the transfer element 19, at least partially outside the edge 22 of the transfer element 19 posi tioned. In this example, the patterns 30 of the stabilization coating 17 and the adhesion promoter coating 18 are each arranged on both sides 20, 21 of the transfer element. The patterns 30 are shown as cutouts in the figures. A pattern can also actually be designed as a geometric, character-like or motif-like recess in the coating in question (negative representation of the geometric shape or motif). However, the pattern 30 of the stabilization coating 17 and the adhesion promoter coating 18 can also be designed differently (in particular as a positive representation of a geometric shape, a character or a character string, with letter(s), number(s) and/or symbol(s), or a motif). By way of example only, the pattern can also be a local (sinusoidal, triangular or rectangular) modulation (+/- 1mm) of the width of the coating along the strip in plan view. The pattern 30 of the stabilization coating 17 and the pattern 30 of the adhesion promoter coating 18 are at least partially arranged in register with one another, ie in particular in the direction in which the substrate 12 extends in the figure and preferably also perpendicular thereto. In the example in FIG. 1, the patterns 30 on the front side 14 and on the back side 15 are arranged identically and completely matched to one another, that is to say both are congruent overall when viewed from above.

As shown in FIG. 1, the security element 10 provided in section 16 has a symmetrical structure. Both coatings 17, 18 extend beyond the transfer element 19 on both sides 21, 22 and each extend with the same width on both sides. In addition, the patterns 30 arranged on the front and back 14, 15 are congruent. In a first variant, the substrate 12 is transparent or translucent for UV light, in particular just as translucent as for visible light. In the UV light, the viewer sees an outer blue, here 1.5 mm wide, emitting section and an inner red-blue (mixed color: magenta) emitting section, here 2 mm wide, on both sides next to the transfer element 19. The Pattern 30 is designed as a recess in this example, ie it can be seen as a non-emitting recess in the inner red-blue section. If, on the other hand, the pattern 30 is a modulation, for example a sinusoidal one, of a coating edge, then the pattern can be recognized in plan view as a modulation of the local width of the section (or both sections). The optical effect of the security feature is so far independent of the viewing situation. The optical effect of the security feature can be seen both from the front 14 and from the back 15 and both in reflected light (illumination from the viewing side) and in transmitted light (illumination from the side opposite the viewing side).

If the transfer element 19 has opaque areas, the sections and patterns 30 of the stabilization coating 17 and the adhesion promoter coating 18 arranged outside the edge 22 of the transfer element 19 are particularly relevant for the appearance of the security element 10 . In an opaque area of the transfer element 19 there is no emission from the front in incident light (due to the lack of UV excitation). The mixed color can also be seen in the opaque area from the back in UV reflected light. In transmitted UV light, no emission is visible when viewed from the back (due to lack of excitation) and when viewed from the front (due to lack of transmission).

In contrast, in transparent areas of the transfer element 19 the mixed color appears to the observer in the UV light--also independently of the viewing situation. Transparent areas of the transfer element 19 may preferably extend from edge to edge or be surrounded by an opaque area. A transparent area following the edge of the transfer element 19 is preferably provided, which in particular surrounds a central opaque and/or translucent area.

In a second variant, the substrate 12 absorbs UV light or is significantly less translucent than for visible light, for example because it contains a UV absorber. In incident UV light, the viewer sees the red emission (and/or pattern 30) of adhesion promoter coating 18 from front side 14 and the blue emission (and/or pattern 30) of stabilization coating 17 from the back. In transmitted UV light the viewer sees the blue emission of the stabilization coating 17 from the front and the red emission of the adhesion promoter coating 18 from the rear. The red luminous section next to the transfer element 19 is 2 mm wide, the blue luminous section is 3.5 mm wide. In this example, the sections are designed in the form of strips in plan view, with the pattern 30 as a non-luminous recess. Correspondingly luminous sections can be visible in transparent areas of the transfer element 19 . Opaque areas of the transfer element 19 remain dark/not luminous both in UV transmitted light and from the front in UV incident light.

In UV light, the two coatings with their fluorescent substances form an attractive optical security feature that the viewer can check. The security can thus - be increased - in particular without additional production costs.

The present example was and further examples will be described with two fluorescent substances as feature components. All examples are however, it can also be used conceptually with other optical feature components, such as two other luminescent substances, two optically variable colorants, one optically variable and one optically invariable colorant or two (invariable) colorants, or with machine-readable feature components, such as IR absorbers, phosphorescent substances or magnetic substances.

The present example was also described, and in some cases also other examples, with reference to two variants relating to the (transparency or) translucency of the substrate for excitation and emission radiation (in other words: excitation and measurement signal). A comparable translucency can be present in the sense of the first variant in the entire (UV range as) excitation range and in the entire (VIS range as) emission range or only selectively in an excitation band and, for example, the two emission bands. The comparable translucency can be, for example, in the range from 10 to 80% transmission, that is to say for example 80%, 60% or 40% transmission for all areas/bands. In essence, similar translucency values, for example 75% (or 40%) in the excitation light and 50% (or 65%) in the emission light, also show the behavior in the sense of the first variant. The second variant of a substrate, which is essentially opaque for a region or a band, is more of a borderline case, for example with transmission <5% (<10%) in the region (or the band). In principle, there are transitional situations - which are not described separately here - when the translucency becomes increasingly different. For example, one of the two emission colors would then be visible only weakly (20% transmission) and the other unchanged bright (80% transmission). FIG. 2 shows a schematic of an exemplary security element 100 which is designed as a variant of the security element 10 . The adhesion promoter coating 18 extends on both sides 20, 21 of the transfer element 19 by a total of 2 mm beyond its edge 22. In contrast to the security element 10 from FIG. 1, however, the adhesion promoter coating 18 contains the pattern 30 only in the part extending beyond the side 20. The stabilizing coating 17 extends on the side 21 of the transfer element beyond its edge 22 by a total of 6 mm and contains its pattern 30 only in the part extending beyond side 21. On the other side 20, the stabilizing coating 17 does not extend beyond the edge 22 (or alternatively, if necessary, exactly up to the edge 22 or, for example, 1 mm beyond the edge 22 ).

In this way, an asymmetrical arrangement is realized. Depending on the side, one or both coatings 17, 18 reach different distances beyond the edge of the transfer element 19. The patterns 30 are now provided on different sides of the transfer element 19 and on different sides of the substrate 12 . The two patterns 30 could also be designed differently.

In UV light, the two coatings with their fluorescent substances form an optical security feature that is even more recognizable and therefore verifiable. Safety can thus be increased in particular without additional production costs. In particular, the security feature shows three different colors (first color, second color and mixed color).

In a first variant, the substrate 12 is in turn transparent or translucent to UV light. In UV light, the viewer sees an outer blue section (4mm wide) on side 21 of rim 22 as well as an inner one red-blue (magenta) section (2 mm wide). On the other side 20 of the edge 22, the viewer now sees a red-emitting section (2 mm wide) in which the pattern 30 of the adhesion promoter coating 18 is visible. An inner red-blue (magenta) section could optionally be present. In variants, however, this can also be avoided. The stabilizing coating 17 can be applied in such a way that it does not extend beyond the edge 22 on the side 20 , ie it ends in front of the edge 22 or ends at the edge 22 . Only a red section can then be seen to the left of the transfer element 19 (on the side 20).

If, in a second variant, the substrate 12 is again absorbent for UV light, the visible luminescence changes less in comparison to the embodiment according to FIG. Viewed from the back 15 and illuminated with UV light, the viewer sees the red luminescent coating 17 as a strip with the pattern 30, for example as an internal recess or as edge modulation. From the front, the viewer sees the blue luminescent adhesion promoter coating 18 as a strip with its possibly different pattern 30. The aspects of the dependency on opaque and/or transparent areas of the transfer element and on the viewing situation that have already been discussed apply analogously and are therefore discussed here and below not repeated again. In this example and also in the following examples, the same luminescence colors are always used in the same coating for the sake of simplicity; the color and the associated coating can of course be freely selected.

FIG. 3 schematically illustrates an exemplary security element 200 that is produced as a variant of the security element 100 . The security selement 200 is also constructed asymmetrically in section 16. In comparison to the security element 100, it is primarily formed in the wrong direction.

In the finished security element 200, the adhesion promoter coating 18 contains its second pattern 30 only on the side 21 of the transfer element 19 beyond its edge 22. The stabilizing coating 17 contains its first pattern 30 only on the side 20 in this way an asymmetrical arrangement of the coatings 17, 18 is realized. As can be seen, the coatings 17, 18 also extend differently beyond the edge—the reverse of FIG. The patterns 30 are in turn provided on different sides of the transfer element 19 and on different sides of the substrate 12 .

The sections that are visible depending on the viewing situation and their colors result analogously to what has already been described for FIGS.

Three variations that are conceivable independently of one another and of the specific figure are briefly described with reference to FIG.

The pattern 30 in the adhesion promoter coating 18 can consist of a large number of similar (or different) pattern elements, such as numbers, numerals or symbols. The pattern elements are arranged next to one another in plan view, for example following the edge 22 .

Secondly, the pattern 30 of a coating, here the adhesion promoter coating 18, can be configured as a strip-shaped cutout, for example, so that it is flush with an edge of the other coating, ending here with the right-hand edge of the stabilization coating 17 congruently. The non-luminescent recess thus borders on two different ones colored/luminescent sections (on the right luminescent in blue, on the left luminescent in mixed color).

Thirdly, one of the coatings could be present with its width modulated on one side or on both sides. For example, the stabilization coating 17 on the left side 20 of the edge 22 of the transfer element 19 could have a sinusoidally modulated edge as a pattern 30, for example. The amplitude of the modulation preferably corresponds to half or the entire width of the section of the stabilization coating 17 which extends beyond an edge of the adhesion promoter coating 18 or beyond the edge of the transfer element. In a top view, the width of the red luminescent section changes along the edge 22 of the transfer element 19 . Depending on the amplitude of the modulation, the red luminescent section can thus be interrupted in a plan view of the front side 14, in particular with amplitude=entire width (or be continuous, in particular with modulation with half the section width).

4 schematically shows an exemplary security element 300 obtainable with the method of embodiments. In comparison to the example in FIG. 1, ie to the security element 10, in the finished security element 300 the adhesion promoter coating 18 and the stabilization coating 17 each on both sides 21, 22 of the transfer element 19 extend further beyond its edge 22, the adhesion promoter coating 18 as a whole by 3.5 mm, the stabilization coating by 8 mm overall. The stabilization coating 17 therefore extends on the side 21 of the transfer element 19 by 4.5 mm beyond the adhesion promoter coating 18 . The adhesion promoter coating 18 and the stabilization coating 17 each contain different or differently arranged patterns 30 in the part extending out on both sides 20, 21 Way also creates an asymmetrical arrangement. The patterns 30 are in turn provided on both sides of the transfer element 19 and on different sides of the substrate 12 . The two patterns 30 provided on the side 20 of the transfer element 19 are arranged in register with one another, but do not have to be identical. The two patterns 30 provided on the side 21 of the transfer element 19 are completely (or partially) arranged without overlapping. Patterns arranged without overlapping can also be identical or different. The patterns 30 are considered below as gaps or as patterns that form gaps; further alternatives have already been named.

In UV light, a section in the mixed color is visible on the left-hand side 20 of the transfer element 19 (from inside to outside), in which colorless gaps can be seen, and a section that appears red is visible. The entire recesses are only colorless or non-luminescent if the recesses are congruent. The colorless void is adjacent only to the mixed color portion (white void in magenta portion). If, on the other hand, the patterns 30 on this side 20 are designed to only partially overlap, then in the mixed-colored section, gap portions that are optionally red or blue can be additionally produced.

Preferably only partially overlapping patterns 30 or non-overlapping motifs 30 of the two coatings 17, 18 complement each other to form an overall motif. On the right side 21 of the edge 22 of the transfer element 19, the pattern 30 of the two coatings 17, 18 are arranged without overlapping. Both patterns are visible and can complement each other to form an overall motif. For example, a rectangular recess 30 in the adhesion promoter lerschicht 18 and a circle as a pattern 30 of the stabilization coating 17 complement each other to form a red glowing letter "i".

FIG. 5 schematically shows another exemplary security element 400 obtainable with the method of embodiments. In comparison to the example in Fig. 1, i.e. to the security element 10, in the finished security element 400 the adhesion promoter coating 18 and the stabilization coating 17 each on the side 21 of the transfer element 19 extend further beyond its edge 22, the adhesion promoter coating 18 by a total of 9 mm, the stabilization coating by a total of 6 mm. The adhesion promoter coating 18 therefore extends—with a section of width 3 mm—laterally from the side 21 beyond the stabilization coating 17. On the side 201 of the transfer element 19, the coatings extend less far beyond its edge 22, for example 2.5 and 1 mm. The adhesion promoter coating 18 and the stabilization coating 17 each contain patterns 30 in the part extending out on both sides 20, 21 of the transfer element.

In this way, an asymmetrical arrangement of the two coatings in the structure of the security element 400 in section 16 is realized. The patterns 30 are provided on both sides of the transfer element 19 and on under different sides of the substrate 12 . The patterns 30 provided laterally from the side 20 of the transfer element 19 and on the front and rear sides 14, 15 of the substrate 12 are arranged in register. In particular, since the sections of the two coatings on the left side 20 are narrow, a pattern along the edge, repeated or locally different, in the width of the two sections is used. Be preferably repeated the change in width of the sections such that along the edge 22, the color regularly between two or three of changes colors (e.g. red/blue/red... or red/magenta/blue/magenta/red...).

FIG. 6 schematically shows another exemplary security element 500 obtainable with the method of embodiments. In comparison to the example in FIG. 5, the coatings in this example are arranged almost symmetrically to one another. However, the coatings 17, 18 (and/or the patterns 30) are both arranged asymmetrically with respect to the transfer element 19 or its edge 22.

In all of the configurations, the substrate 12 is preferably a paper substrate. Paper substrate is translucent for visible light and can be made absorbing for UV light. For paper substrates, it is known that the transmissivity of the substrate can be varied locally, for example with a local variation in the thickness of the substrate, such that the viewer recognizes a motif in transmitted light (watermark). In all embodiments, patterns 30 in one or both of the coatings may be replaced by a substrate pattern, or a substrate pattern may be provided in addition. In FIG. 6, for example, the two patterns 30 on the side 21 of the edge 22 of the transfer element 19 can be replaced by a substrate pattern. The local variation in the transmissivity/translucency of the substrate can locally influence UV excitation through the substrate and/or visibility of the luminescence through the substrate. For example, a watermark in the paper substrate is visible in transmitted UV light as a pattern 30 recognizable in the color (hue of the mixed color varies locally) and the brightness of the fluorescence (intensity of the light varies locally).

In all configurations, the transfer element 19 can be a transfer strip or a transfer patch. In the case of a transfer patch, for example in the form of an oval, the edge 22 of the transfer element 19 runs once around the transfer element. Each of the coatings 17, 18 can be arranged with its own motif shape, such as rectangle or apple, and/or - as shown in the figure - arranged asymmetrically at least in the direction of the cross-section shown. The coatings 17, 18 could therefore be designed with a larger area--for example both also as ovals--but be shifted in plan view in (the same or) different directions with respect to the oval of the transfer element.

FIG. 7 schematically illustrates an exemplary security element 600 obtainable with the method of embodiments. The arrangement of the coatings 17 , 18 is in turn designed asymmetrically, reaching beyond the edge 22 of the transfer element 19 .

In contrast to the variants shown so far, the stabilization coating 17 contains an additional pattern 31 within the edge 22, here arranged centrally to the transfer element 19. The pattern 31 is shown as a recess. Both coatings 17, 18 can have such patterns, which can be either completely inside the rim 22 or both inside the rim 22 and outside the rim 22 (the pattern extends beyond the rim). For a stabilization coating, DE 102019005551 describes examples of such patterns, at least also on the inside, in more detail, in particular with regard to FIGS. 4 to 6 there, which can be used as patterns in the present sense in one or both coatings.

The coatings 17, 18 in FIG. 7 can have a dye as the feature component or as an additional feature component. as well the luminescent feature components of the coatings 17, 18, such as the red and blue fluorescent feature substances, could also be visible in the visual range. For simplification, it is again assumed that the stabilization coating 17 is visible in red and the adhesion promoter coating 18 is blue and luminescent in the visual range.

The colors are of course - here as in every other figure - freely selectable. For example, yellow and blue (with a corresponding (green) mixed color) can also be used as luminescent colors.

The behavior in the visual area is described using FIG. 7, but can be transferred to the other figures.

In VIS incident light, ie incident light with visible light, the observer in FIG. 7 sees the coating 18 with the patterns 30, 31 from the back 15 and the coating 17 with the pattern 30 from the front 14. This applies within the edges 22 of the transfer element 19, insofar as the transfer element 19 is transparent in general or in certain areas, and generally outside the edges of the transfer element 19. In this example, the sides are the side 21 of the transfer element 19 and on the front and back sides 14, 15 the substrate provided pattern 30 arranged in register and identical table. In the VIS transmitted light, the pattern 30 of the front and the back 14, 15 are recognizable in the section on the side 21 of the Trans ferelements 19. For example, the patterns 30 are discernible in a mixed tone (purple) when formed by the coatings 17, 18, or are discernible as colorless in a portion with a mixed tone (purple) when formed by recesses. The coatings 17, 18 provide the viewer with an easily verifiable see-through security feature. In principle, machine-readable feature components, such as IR absorbers (measurement usually in IR transmitted light) or phosphorescent substances (measurement in reflected or transmitted light), in the selectively arranged coatings 17, 18 form a security feature that is only machine-readable. Starting from FIG. 7, an embodiment with only magnetic feature components will now be described. The adhesion promoter coating 18 may include a first magnetic feature component and the stabilizer coating 17 may include the same or a stronger (more magnetic) second magnetic feature component. With the aid of the asymmetrical arrangement of the coatings 17, 18 and/or with the aid of patterns 30 in the coatings 17, 18, a magnetic security feature, in particular a machine-readable magnetic coding, is produced. For example (on one or both of the sides 20, 21) in plan view along the edge 22 of the transfer element 19 coding can be done by one or both of the coatings 17, 18 alternately extending beyond the edge and not extending beyond. Likewise, such a magnetic coding could be formed only within half or only outside of the edge. If FIG. 7 shows, for example, the cross section through a point with a recess 31, when viewed from above, the point with a recess can be followed by a point without a recess. If positions with and without gaps alternate, a magnetic coding is produced which, in a plan view in FIG. 7, runs along the edge 22 or in the plane of the drawing. If gaps have a magnetic strength of 0, the stabilizing layer has a magnetic strength of 4 and the adhesion promoter layer has a magnetic strength of 1, four different magnetic strengths (0+0, 0+1, 4+0 and 4+1) or two can be used locally

Code magnet strengths (0 or 1 /4 or 5). A coding by the local magnet strength and/or by the size of the sections (with the same strength) can be done. A coding can then, for example, be appropriately arranged pattern, for example with the magnet strength sequence 4, 0,

5, 0, 1, 4... are present.

A security element 600 is shown schematically in incident light in FIG. 8a and in transmitted light in FIG. 8b.

The adhesion promoter coating 18 and the stabilizing coating 17 contain, as before, two differently fluorescent dyes. The security element 600 is irradiated on its front side 14 with UV light 50 (ultraviolet light) in incident light and the fluorescence 60 is seen by the observer of the front side. The transfer element 19 can be opaque, for example. Then the viewer sees a magenta glowing section on both sides next to the edge of the transfer element 19 . On the right side the section is wider than on the left side and also has the pattern 30 on it. On the left, the magenta glowing section is followed by a red glowing section. Only with UV excitation and observation from the rear does the observer also see the pattern 31, in the example as a blue-glowing section between the magenta-glowing sections, which extend beyond the edge of the transfer element.

If the security element 600, as shown in FIG. 8b, is irradiated on its rear side 15 with UV light 50 and if the fluorescence 60 is viewed from the front side 14, the result (with a transparent substrate 12) is the same for the viewer as in reflected light. As already mentioned, however, the occurrence or the visibility of the fluorescence can be controlled by means of appropriate absorbers (UV absorbers or VIS absorbers)—in particular in the substrate 12 or the coatings. In Fig. 9a to 9c, a security element 600, which can be designed according to FIG. 7, is shown schematically. A strip is applied as the transfer element 19 in section 16 of the substrate 12 . 9b shows the front side 14 of the security element 600. In the section 16 of the substrate 12 indicated by the dashed lines, a security strip is applied as the transfer element 19 to the adhesion promoter coating 18. FIG. The adhesion promoter coating 18 extends asymmetrically--at least with its pattern 30--over the transfer element 19, here for example only or more on the right side. It includes a fluorescent feature component. The pattern 30 is a repeating sequence of digits "200". It includes the digits or the sequence of digits as pattern elements. The pattern elements can be connected to one another and/or to the strip-shaped section or - as shown - be separated by a recess. The applied Adhesive coating 18 forms the pattern 30. If the feature component of the adhesive coating 18 (or another of its components) is visually visible (optional), the adhesive layer 18 with its strip-shaped section, which preferably already extends beyond the edge of the transfer element on at least one side and with the repeating sequence of digits. To simplify matters, the illustration assumes a transparent transfer element. However, the transfer element usually includes opaque and/or UV-absorbing and / or optically variable areas.

9c shows the rear side 15 of the security element 600. The stabilization coating 17 is applied to the rear side 15 in strip form. In addition, a pattern 30, as before, is formed as a sequence of pattern elements, and a pattern 31 through a recess in the stabilizer lisation coating 17 formed. The pattern 31 is designed as a geometric shape. Stabilization coating 17 includes the same fluorescent feature component (eg, green) as the primer coating, or a different fluorescent feature component (eg, red and blue). If the stabilization coating 17 is visible to the viewer (optional), he sees a strip with a recess and a repeating sequence of numbers on only one side.

9a shows the security element 600 in UV light when viewed from the front 14. Both coatings 17, 18 fluoresce due to the UV light (UV incident light or UV transmitted light). The patterns 30, 31 are recognizable to the observer . The patterns 30 lying on different sides of the substrate complement each other to form an overall motif. For this purpose, the patterns 30 are arranged in a non-overlapping manner in plan view. In the case of feature components of the same color in the two coatings 17, 18, the pattern 31 can be seen as a darker, because less brightly lit, geometric shape in the brightly lit strip. For different fluorescent coatings 17, 18, the pattern 30 can be seen alternating with the corresponding color (blue 200, red mirrored 200, ...). The strips of the two coatings 17, 18, which overlap—for example completely—light up in a mixed color (red+blue=>magenta). The pattern 31 can then be recognized, for example, as a geometric shape that lights up in blue in the magenta-colored strip. The transfer element 19 should therefore actually be transparent for the example from FIG. 9c, at least in the area of the pattern 31, ie in the middle third. Non-transparent areas, in particular in the upper and/or lower third of the transfer element 19, could—as already described above, depending on the viewing situation—prevent the excitation of the fluorescence and/or the visibility of the fluorescence. Reference List

10 security element

12 substrate

14 front

15 back

17 stabilization coating

18 primer coating

19 transfer element

20 page

21 page

22 fringe

30 patterns

31 patterns

100 security element

200 security element

300 security item

400 security element

500 security element

600 security item

Claims

P atentClaims

1. A method for producing a security element (10; 100; 200; 300; 400; 500; 600) with a security feature, which has the following steps: a) providing a planar extended substrate (12) having a front side and a back side (14, 15) and at least one portion (16); bl) applying a stabilization coating (17) in the section (16) on the back (15) of the substrate (12); b2) applying an adhesion promoter coating (18) in the section (16) on the front side (14) of the substrate (12); and c) applying a transfer element (19) to the adhesion promoter coating (18); the transfer element (19) being delimited on at least a first and a second side (20, 21) by an edge (22) lying within the section (16), and the stabilizing coating, seen in a top view of the planar substrate (12). (17) and the adhesion promoter coating (18) are each formed on at least one of the first and second sides (20, 21) of the transfer element (19) extending beyond its edge (22); wherein the stabilization coating (17) and the adhesion promoter coating (18) each comprise a feature component, in particular an optical or machine-readable one, and wherein the stabilization coating (17) and the adhesion promoter coating (18) together form the security feature.

2. The method according to claim 1, wherein the stabilization coating (17) and / or the adhesion promoter coating (18) asymmetrically over the edge (22) of the transfer element are formed reaching out, in particular

- The stabilization coating (17) on the first and the second side (20, 21) of the transfer element (19) differs or only on one of the two sides (20,21) beyond its edge (22); and or

- The adhesion promoter coating (18) on the first and the second side (20, 21) of the transfer element (19) extends beyond its edge (22) differently or only on one of the two sides (20,21).

3. The method according to claim 1 or 2, wherein the stabilizing coating (17) and/or the adhesion promoter coating (18) are formed with a pattern (30, 31), in particular with different patterns; preferably the stabilization coating (17) is formed with at least one first pattern (30, 31) and the adhesion promoter coating (18) is formed with at least one second pattern (30, 31).

4. The method according to claim 3, wherein the stabilization coating (17) and/or the adhesion promoter coating (18)

- be formed with the pattern (30, 31) outside the edge (22), and/or

- Are formed within the edge (22) with the pattern (30, 31).

5. The method according to any one of claims 1 to 4, wherein the stabilization coating (17) comprises a first, in particular optically effective or machine-readable, feature component and the adhesion promoter coating (18) comprises a second, different, in particular optically active or machine-readable, feature component.

6. The method according to any one of claims 1 to 5, wherein

- The stabilizing coating (17) and the adhesion promoter coating (18) in at least one direction - preferably in two mutually perpendicular directions - are arranged in register with one another; and/or wherein the stabilizing coating (17) and/or the adhesion promoter coating (18) is formed in at least one direction—preferably in two mutually perpendicular directions—in register with the transfer element and/or with a pattern of the substrate (12). .

7. The method according to any one of claims 1 to 6, wherein the optically effective feature component is visible to the viewer upon irradiation, in particular in the UV range, in the visible range or in the IR range, preferably for the viewer only upon irradiation in the UV range or IR range is visible; or the machine-readable component is only mechanically recognizable, in particular is magnetically recognizable or is only spectrally recognizable by machine when irradiated, for example in the UV range, in the visible range or in the IR range.

8. The method according to any one of claims 1 to 7, wherein the security feature is an optical security feature that is visible to the viewer, preferably with both patterns, which is visible to the viewer, in particular

- is visible in a given viewing situation, preferably given ner viewing and lighting side, or - is perceptible with a change of the viewing and/or lighting side.

9. The method according to any one of claims 1 to 8, wherein the security feature is a machine-readable security feature, which

- is machine-readable with a single measuring step, or

- is machine-readable with several, preferably simultaneous, measuring steps, different Licher type or different measuring situation, in particular measuring and / or lighting side.

10. The method according to any one of claims 1 to 9, wherein the transfer element (19)

- Has a basic shape, the basic shape being in particular a geo metric basic shape, in particular a rectangle, circle, polygon or regular n-gon, or a motif-like basic shape; and or

- is bounded either as a strip on exactly two sides by its two edges (22), or as a patch on the two sides by two sections of its peripheral edge (22); and or

- an optically variable transfer element (19) with more than two transfer element layers, with an adhesive layer as a transfer element layer connecting the transfer element (19) to the adhesion promoter coating (18), and to further transfer element layers, which are selected in particular from:

+ Relief structure layer, in particular embossed lacquer layer with embossed relief structure, and/or

+ reflection-enhancing layer, which in particular follows the relief of the relief structure layer, and/or

+ Color-shifting transfer element layer, which in particular comprises at least one dielectric layer or a layer with color-shifting comprises the pigments, and/or

+ Machine-readable feature layer, in particular with an IR feature, a phosphorescent feature or a magnetic feature;

+ Carrier layer, in particular made of paper or plastic, which is preferably transparent before.

11. The method according to any one of claims 3 to 10, wherein the stabilization coating (17) and / or the adhesion promoter coating (18) are applied,

- with a geometric, character-like or motif-like recess as a pattern (31), and/or

- with a pattern (30) that includes repeating pattern elements, and/or,

- with a pattern (30) which comprises geometric, character-like or motif-like pattern elements, and/or

- With at least one independent - in particular independent of the basic form of the transfer element within the meaning of claim 10 - geometric or motif-like pattern (30,31).

12. The method according to any one of the preceding claims, wherein the larger surface area of the surfaces of the two coatings (17, 18) extending beyond the edge of the transfer element (19) is larger by at least a factor of 1.2, preferably between 1.2 and 8 times greater, more preferably between 1.25 and 4 times greater.

13. The method according to any one of the preceding claims, wherein the stabilization coating (17) and the adhesion promoter coating (18) seen in a plan view of the flat substrate (12) do not overlap at least partially outside the edge (22), in particular such that , preferably in transmitted light or in a luminescence excitation light, a first motif of the stabilization coating (17) and a second motif of the adhesion promoter coating (18) are simultaneously visible to the viewer, which preferably complement each other to form an overall motif or a continuous motif.

14. The method according to any one of the preceding claims, wherein

- The stabilization coating (17) and/or the adhesion promoter coating (18) are printed on, in particular by means of screen printing; and or

- The stabilizing coating (17) and the adhesion promoter coating (18) are applied either in one operation or in two operations, in particular with two or more than two patterns that are at least partially in register with one another; and or

- The stabilization coating (17) is applied before the adhesion promoter coating (18) and before the transfer element (19); after the adhesion promoter coating (18) and before the transfer element (19) is introduced; or is applied after the adhesion promoter coating (18) and after the transfer element (19).

15. The method according to any one of the preceding claims, wherein the stabilization coating (17) comprises a stabilization component and less than 10% of the feature component, in particular between 0.1 to 10%, more preferably between 0.1 to 3%; and/or the adhesion promoter coating (18) comprises an adhesion promoter component and less than 10% of a feature component, in particular between 0.1 to 10%, more preferably between 0.1 to 3%; and/or the stabilization coating (17) or the adhesion promoter coating (18) comprises less than 10% of a further feature component, in particular between 0.1 and 10%, more preferably between 0.1 and 3%.

16. The method according to any one of the preceding claims, wherein the feature component of the stabilization coating (17) and the feature component of the adhesion promoter coating (18) are luminescent feature components, wherein in particular

- the luminescent feature components are luminescent, preferably fluorescent or phosphorescent, colorants, preferably luminescent dyes or luminescent pigments; and or

- the luminescent feature components can each be excited in different spectral ranges, in particular in the UV range and in the IR range, or both can be excited in the same spectral range, in particular in the UV range or in the IR range; and or

- the luminescent feature components can be excited separately from one another and/or together, in particular with non-overlapping, partially overlapping or with overlapping excitation bands; and or

- The substrate (12) for the excitation light is translucent or an excitation light absorber, such as UV or IR absorber contains; and or

- Stabilization coating (17) and / or the adhesion promoter coating (18) additionally contains an excitation light absorber, such as UV or IR absorber.

17. The method according to any one of claims 1 to 16, wherein at least one of the feature components of the stabilization coating (17) and the adhesion promoter coating (18) is an optically variable feature component; where in particular - the optically variable feature component, preferably pigment or dye, is an iridescent, specularly reflecting or color-shifting feature component; and or

- the optically variable feature component of the stabilization coating (17) or the adhesion promoter coating (18) differs from at least one optically invariable feature component of the other coating (17, 18), which is distinguished in particular by a color-stable colorant and/or luminescent colorant and/or a matting agent is formed.

18. The method according to any one of the preceding claims, wherein at least one of the feature components of the stabilization coating (17) and the adhesion promoter coating (18) is a magnetic feature component or the stabilization coating (17) and/or the adhesion promoter coating (18) is additionally a further, magnetic one feature component includes; where in particular

- Stabilizing coating (17) and/or the adhesion promoter coating (18) with the magnetic feature component is applied in such a way that a magnetic code can be read; and or

- the stabilization coating (17) and the adhesion promoter coating (18) comprise the same magnetic feature component, in particular with low or high magnetic strength, or each comprise different magnetic feature components, in particular with low magnetic strength in one and with high magnetic strength in the other of the two coatings (17,18).

19. The method according to any one of the preceding claims, wherein at least one of the feature components of the stabilization coating (17) and the adhesion promoter coating (18) has a coloring feature component or the stabilizing coating (17) and/or the adhesion promoter coating (18) additionally comprises a further coloring feature component; where in particular

- the color-imparting feature component(s) are semi-transparent colorants, dyes or color pigments, in particular color-variable or color-constant pigments; and or

- the coloring feature component(s) of the two coatings (17,18) are of different colors; and or

- The colors of the color-giving feature component(s) are visible in transmitted light, in which case - if the stabilizing coating (17) and adhesion promoter coating (18) overlap - a mixed color results in transmitted light.

20. The method according to any one of the preceding claims, wherein

- The adhesion promoter coating (18) seen in plan view of the flat sub strate (12) by 0.5 to 24 mm beyond the edge (22) of the transfer element (19) extends, preferably by 1 to 12 mm; and or

- The stabilization coating (17) seen in plan view of the flat sub strate (12) by 0.5 to 24 mm beyond the edge (22) of the transfer element (19), preferably by 1 to 12 mm; and or

- Seen in a top view of the flat substrate (12), an area of the adhesion promoter coating (18) or the stabilization coating (17) that extends beyond the edge of the transfer element (19) corresponds to less than 150% of the area of the transfer element, preferably less than 100 %, more preferably between 5% and 95% percent;

- Seen in a top view of the flat substrate (12), a surface of the adhesion promoter coating (18) that extends beyond the edge of the transfer element (19) is larger than the surface of the stabilization coating (17) that extends out; and or - Cover the adhesion promoter coating (18) and the stabilizing coating (17) in each case less than 50% of the front side of the substrate or the back side of the substrate, respectively.

21. The method according to any one of the preceding claims, wherein the substrate (12) in section (16) at least in the region of the transfer element (19) contains at least one element selected from a reduced thickness, a varying thickness, a substrate pattern-forming redu decorated thickness, a varying thickness forming a substrate pattern, a window or a hole, and any combination thereof; and/or the substrate (12) is a paper substrate.

22. The method according to any one of the preceding claims, wherein in addition to the stabilization coating (17) with its first feature component and the adhesion promoter coating (18) with its second feature component, a further stabilization or adhesion promoter coating with a further feature component in the section on the substrate (12) applied; where in particular:

- the additional stabilization or adhesion promoter coating is an additional stabilization coating with the stabilization component or an additional adhesion promoter coating with the adhesion promoter component according to claim 14; and or

- The further stabilization or adhesion promoter coating in the Ar beitsgang or one of the two operations according to claim 13 is printed; and or

- The further stabilization coating on the rear side of the substrate in a third pattern or the further adhesion promoter coating on the front side of the substrate in a fourth pattern, preferably in areas, in particular in strips, is applied so that in particular special areas of the further stabilization or adhesion promoter coating are surrounded on at least two sides, preferably exactly two sides or completely, by the stabilization or adhesion promoter coating (17,18); and or

- Seen in plan view, the further stabilization or adhesion promoter coating is applied both within the edge (22) of the transfer element (19) and beyond.

23. The method according to any one of the preceding claims, wherein a fourth optical or machine-readable feature component is applied, in particular printed, to the stabilization coating (17) with its first feature component or to the adhesion promoter coating (18) with its second feature component.

24. Security element, in particular in the form of a security paper or a bank note, which is preferably produced using a method according to one of claims 1 to 23, and comprises: a planar extended substrate (12) which has a front and a back and at least having a portion (16); a stabilizing coating (17) in the portion (16) on the back side (15) of the substrate (12); an adhesion promoter coating (18) in the portion (16) on the front side (14) of the substrate (12); and a transfer element (19) on the primer coating (18); wherein the transfer element (19) is delimited on at least a first and a second side (20, 21) by an edge (22) lying within the section (16) as seen in a plan view of the flat substrate (12), and the stabilization coating (17) and the adhesion promoter coating (18) are each formed on at least one of the first and second sides (20, 21) of the transfer element (19) and extend beyond its edge (22); wherein the stabilization coating (17) and the adhesion promoter coating (18) each comprise a feature component, in particular an optical or machine-readable one, and wherein the stabilization coating (17) and the adhesion promoter coating (18) together form the security feature.

25. Security document, in particular security paper or banknote, having a security element (10; 100; 200; 300; 400; 500; 600) according to claim 24.

26. A method for producing a security element (10; 100; 200; 300; 400; 500; 600) with a security feature, which has the following steps - and optionally further steps from one of claims 2 to 23 -: a) providing a planar extended A substrate (12) having front and back surfaces (14, 15) and at least one portion (16); bl) applying a stabilization coating (17) in the section (16) on the back (15) of the substrate (12); b2) applying an adhesion promoter coating (18) in the section (16) on the front side (14) of the substrate (12); and c) applying a transfer element (19) to the adhesion promoter coating (18); wherein the transfer element (19) is arranged delimited on at least a first and a second side (20, 21) by an edge (22) protruding within the section (16), as seen in a plan view of the planar substrate (12), and the stabilization coating (17) and the adhesion promoter coating (18) are each formed on at least one of the first and second sides (20, 21) of the transfer element (19) beyond its edge (22); wherein the stabilization coating (17) and the adhesion promoter coating (18) each comprise a feature component, in particular an optical or machine-readable one, and wherein the stabilization coating (17) and the adhesion promoter coating (18) form two independent security features, in particular one of the two coatings (17,18) forms an optical security feature and the other of the two coatings (17,18) forms a machine-readable security feature.

27. Security element, in particular in the form of a security paper or a banknote, which is preferably produced using a method according to claim 26 and optionally with further steps from one of claims 2 to 23, and comprises: a substrate (12) extending over a surface area, having a front and a back and at least one portion (16); a stabilizing coating (17) in the portion (16) on the back side (15) of the substrate (12); an adhesion promoter coating (18) in the portion (16) on the front side (14) of the substrate (12); and a transfer element (19) on the primer coating (18); wherein the transfer element (19) is delimited on at least a first and a second side (20, 21) by an edge (22) protruding within the section (16) as seen in a plan view of the flat substrate (12), and the stabilization coating (17) and the adhesion promoter coating (18) are each formed on at least one of the first and second sides (20, 21) of the transfer element (19) and extend beyond its edge (22); wherein the stabilization coating (17) and the adhesion promoter coating (18) each comprise a feature component, in particular optical or machine-readable, and wherein the stabilization coating (17) and the adhesion promoter coating (18) form two independent security features, in particular one of the two coatings (17,18) forms an optical security feature and the other of the two coatings (17,18) forms a machine-readable security feature.