Method for producing a security element, and security element

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

[0001] The invention relates to a method for producing a security element, a security element and a security document.

[0002] WO 2014 / 095039 A1 describes a continuous, windowless sheet of security paper that is provided with a stabilizing coating.

[0003] EP 2461970 B1 describes a manufacturing process for a security paper and a security paper obtainable thereby, wherein a window opening is provided that is covered by a film. A stabilizing coating is applied around this opening for stabilization.

[0004] DE 10 2019 005 551 A1 describes a method for producing a security paper, wherein a stabilizing coating is applied to the back and a transfer element is applied to the front of a continuous section of a paper substrate. The stabilizing coating may cover less than 98% of the area of ​​the transfer element in plan view and / or extend beyond the transfer element.

[0005] DE 10 2019 006890 A1 shows the preamble of claim 1.

[0006] The invention is based on the object of providing an efficient method for producing a security element and a security element which simultaneously promote the security against counterfeiting of the security element.

[0007] The invention is defined in the independent claims. The dependent claims relate to preferred developments.

[0008] The method for producing a security element with a security feature comprises the following steps: Providing a flat substrate having a front and a back side and at least one section; applying a stabilizing coating in the section on the back of the substrate; applying an adhesion promoter coating in the section on the front of the substrate; and applying a transfer element to the adhesion promoter coating. Viewed in plan view of the flat substrate, the transfer element is arranged on at least a first and a second side, delimited by an edge lying within the section. The stabilizing 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 stabilizing coating and the adhesion promoter coating each comprise a feature component. The stabilizing coating and the adhesion promoter coating, together with their feature component, form the security feature or two independent security features. The feature components of the stabilizing coating and the adhesion promoter coating are both luminescent feature components.

[0009] The process produces a security element in which an optical or machine-readable feature component of the stabilizing coating is combined with an optical or machine-readable feature component of the adhesion promoter coating to form a single security feature. This optimizes the security element's counterfeit protection. Reusing the two selected functional coatings simplifies production while simultaneously increasing the security of the security element. Reworkability is made more difficult by the integration of the transfer element. Furthermore, the adhesion promoter coating makes it difficult to remove the transfer element, and if successfully removed, this is evident due to the destruction of the adhesion promoter layer.

[0010] Particularly preferably, the stabilizing coating and / or the adhesion promoter coating are formed so as to extend asymmetrically beyond the edge of the transfer element. For example, the stabilizing coating can extend beyond the edge of the transfer element on the first and second sides thereof. Alternatively, the stabilizing coating can extend beyond the edge of the transfer element on only one of the two sides, i.e., in particular, not extend beyond the edge on at least the second side. At the same time, or alternatively, the adhesion promoter coating can extend beyond the edge of the transfer element to different degrees on the first and second sides of the transfer element, or extend beyond the edge of the transfer element only on the first side, i.e., in particular, not extend beyond the second side.

[0011] The stabilizing coating and / or the adhesion promoter coating can (each) be formed with at least one pattern. The patterns can be different. Preferably, the stabilizing coating has at least one first pattern and the adhesion promoter coating has at least one second pattern.

[0012] Preferably, the stabilizing coating comprises a first, in particular optically effective or machine-readable, feature component and the adhesion promoter coating comprises a second different, in particular optically effective or machine-readable, feature component.

[0013] The asymmetrical arrangement and / or pattern can be used to create the optical, viewer-visible, or machine-readable security feature. It should be noted that a pattern in the corresponding coating only optionally creates an asymmetrical arrangement. For example, if the same pattern is arranged symmetrically on both sides of the edge, or if a pattern is arranged within the edge, the arrangement extending beyond the edge remains symmetrical.

[0014] The stabilizing coating and the adhesion promoter coating can therefore have identical patterns and different feature components, different patterns and identical feature components, or preferably different patterns and different feature components. In each of these cases, the stabilizing 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.

[0015] Analogously, the stabilizing 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, can be arranged differently asymmetrically and have different feature components. The stabilizing coating and / or the adhesion promoter coating could have patterns in each of these further cases.

[0016] 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 / transparent view / front / back).

[0017] The stabilizing coating and the adhesion promoter coating are preferably arranged in register with each other in at least one direction—preferably in two mutually perpendicular directions. Alternatively or additionally, the stabilizing coating and / or the adhesion promoter coating can be arranged in register with the transfer element and / or a pattern of the substrate, such as a watermark, in at least one direction—preferably in two mutually perpendicular directions.

[0018] The feature components of the two coatings can be optically effective or machine-readable feature components. An optically effective feature component is visible to the viewer upon irradiation, in particular in the UV range, the visible range, or the IR range. Preferably, it is only visible to the viewer upon irradiation in the UV or IR range, i.e., it is particularly transparent in the visible range or designed in the color of the (paper) substrate. A machine-readable component is preferably only machine-recognizable, in particular magnetically recognizable, or, upon irradiation, for example, in the UV range, the visible range, or the IR range, only machine-recognizable spectrally. Thus, when illuminated in one of the ranges (IR, VIS, UV), the feature component can, for example, be excited to emit at one or more specific wavelengths (luminescence) or reflect the radiation unchanged, if necessary.selectively reflect only one or more specific wavelengths.

[0019] The security feature is particularly preferably an optical security feature visible to the viewer, preferably with both patterns. The security feature can be visible in a given viewing situation, preferably a given viewing and illumination side. For example, the security feature is visible in incident light and / or transmitted light from one viewing side, optionally from both viewing sides. Alternatively, the security feature can be perceptible to the viewer with a change in the viewing and / or illumination side. By changing the viewing side (front / back) and / or the illumination side (incident / transmitted light), the different optical effect of the two feature components and / or their different patterns becomes recognizable.

[0020] Because the adhesion promoter coating and the stabilizing coating are located on opposite sides of the substrate, only the pattern on the illuminated side of the security element is visible, for example, when viewed in reflected light (and on a paper substrate with correspondingly low translucency). For example, in reflected UV light, only the fluorescent pattern on the illuminated side is visible if the paper substrate absorbs the UV radiation (or the luminescence radiation from the opposite side). However, when illuminated with light, e.g., even with UV light, through the paper, 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 stabilizing coating complement each other.Mixed colours can also be observed in the area of ​​overlapping coloured, particularly fluorescent, patterns of the adhesion promoter coating and the stabilising coating on the front and back of the security element.

[0021] 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 illumination side needs to be changed, nor does a separate measurement of the feature components need to be performed to capture the effect of the two feature components. Alternatively, the security feature could also only be machine-readable with several, preferably simultaneous, measurement steps, of different types or in different measurement situations, in particular the measurement and / or illumination side.

[0022] 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.

[0023] In the particularly preferred embodiment, the stabilizing coating and / or the adhesion promoter coating are applied outside the edge with its at least one pattern.

[0024] The transfer element can have opaque regions and optionally transparent or translucent regions. Configurations with two patterns located outside the edge are therefore particularly advantageous, especially in cases where the transfer element has opaque regions, or because they are independent of the presence / position of the opaque region. Alternatively or additionally, at least one pattern of the stabilizing coating and / or the adhesion promoter coating can be formed within the edge. A configuration with a pattern located within the edge is particularly advantageous for transparent or translucent transfer elements or when arranged in a transparent or translucent region of the transfer element.

[0025] The transfer element is generally designed as a strip, which extends in particular over the entire length or width of the substrate, or as a patch, which extends only locally. The transfer element has a basic shape, wherein the basic shape is 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 bounded on both sides by two sections of its peripheral edge.

[0026] The transfer element is preferably an optically variable transfer element with more than two transfer element layers. An adhesive layer as the transfer element layer (permanently) connects the transfer element to the adhesion promoter 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-enhancing 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 dielectric layer or a layer with color-shifting pigments, and / or a machine-readable feature layer, in particular with an IR feature, phosphorescent feature, or 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 provided for transfer elements.The transfer element will have an adhesive layer, which is preferably a thermally activated or radiation-curing adhesive layer. The transfer element can have its own carrier layer, in particular a 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 usually transferred as an element from an intermediate carrier to the coated substrate. The adhesion promoter coating promotes the adhesion of the transfer element to the substrate. Adhesion promoter coatings are also called primer coatings. They are well known and therefore should not be confused with the adhesive layer that bonds the transfer element to the substrate.

[0027] Therefore, the adhesion promoter component of the adhesion promoter coating will be discussed only 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 combination thereof, in particular an aqueous polyurethane and / or acrylate dispersion. The isocyanate, the epoxy, the aziridine, and / or the carbodiimide can be used as crosslinkers for the aqueous polyurethane and / or acrylate dispersion. This can, in particular, provide the starting materials for a coating material.

[0028] The stabilizing coating itself is also sufficiently well known in its purpose and design. Reference can be made, for example, to EP 2461970 B1, and in particular to its formation as a crosslinked lacquer layer. The stabilizing coating maintains the flatness of the substrate, particularly during the application of the transfer element and / or during subsequent printing steps, such as banknote printing, particularly intaglio printing (steel engraving). When the transfer element is applied, or when intaglio printing is performed during banknote printing, a compressive force is applied to the front of the substrate with the transfer element, which the stabilizing coating counteracts with a counterforce. Therefore, one possible stabilizing component of the stabilizing coating will be briefly discussed only as an example.The stabilizing coating can contain at least one or more identical or 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. Furthermore, 100% UV-curable mixtures, aqueous UV-curable mixtures, and dual-cure mixtures, e.g., mixtures curable with UV light and a crosslinker, can be used.

[0029] The transfer element has a basic shape defined by the two-sided or circumferential edge of the transfer element. Typically, the edge is linear or circular, meaning the basic shape is an n-gon, rectangle, or circle. However, transfer elements with motif-like basic shapes, such as apple-shaped patches or stripes with round or square bulges, are also known. Since the two coatings are applied functionally for the transfer element, they are at least also applied in alignment with the basic shape of the transfer element. DE 10 2019 005 551 A1 shows corresponding examples of the stabilizing coating.

[0030] The previously described asymmetrical arrangement (extending beyond the edge to varying degrees) of one or both coatings can be designed independently or independently of the basic shape. For example, around a transfer strip (with a straight edge), the strip-like sections (with a straight edge) of the (stabilizing or adhesion promoter) coating extending beyond the edge on both sides can be of different widths. Alternatively, a (stabilizing or adhesion promoter) coating that is elongated oval or elongated cloud-shaped in plan view could be provided around a transfer strip (with a straight edge).

[0031] Furthermore (or also in the sense of the last alternative), one 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 (two) coating(s) can alternatively or additionally comprise repeating pattern elements. Likewise alternatively or additionally, a geometric, character-like (letter(s), number(s), symbol(s)) or motif-like recess in the corresponding coating can serve as the 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 arranged separately from the further section(s) of the corresponding coating.

[0032] The two coatings each extend beyond the edge of the transfer element with their areas FS and FH, area FS of the stabilizing coating outside the edge and area FH of the adhesion promoter coating outside the edge. The larger area (FS or FH) of the two areas (FS, FH) of the coatings extending beyond the edge is at least a factor of 1.2 larger than the (other of the two) smaller area (FH or FS). The following therefore applies: FS > 1.2*FH or FH > 1.2*FS. Preferably, the larger area is between 1.2 and 8 times larger than the smaller of the two areas. The following then applies: 8*FH > FS > 1.2*FH or 8*FS > FH > 1.2*FS. The larger area is particularly preferably between 1.25 and 4 times larger. The following accordingly applies: 4*FH > FS > 1.25*FH or 4*FS > FH > 1.25*FS.

[0033] Particularly preferably, the stabilizing coating and the adhesion promoter coating do not overlap at least partially outside the edge, as viewed from above the flat substrate. Preferably, in transmitted light or luminescence excitation light, a first motif of the stabilizing coating and a second motif of the adhesion promoter coating are simultaneously visible to the viewer. The two patterns preferably complement each other to form an overall motif, which optionally repeats in one direction, or to form a continuous motif.

[0034] In advantageous embodiments, the stabilizing coating and / or the adhesion promoter coating are printed, in particular by screen printing, optionally by offset printing, gravure printing, or flexographic printing. The two coatings can be applied in a single operation, meaning the coatings and their patterns are thus in register with each other. The two coatings can also be applied in two operations in register with each other, in particular with two or more than two patterns that are in register with each other—at least in one direction. These measures promote the efficiency of the process and reduce its costs. The stabilizing coating is preferably applied before the transfer element. The stabilizing coating can be applied before the adhesion promoter coating and before the transfer element, or after the adhesion promoter coating and before the transfer element.Only alternatively, it is conceivable to apply the stabilizing coating after the adhesion promoter coating and after the transfer element.

[0035] The stabilizing coating comprises a stabilizing component and can 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 stabilizing coating or the adhesion promoter coating can additionally comprise 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 refer to proportions of the dry weight in the applied state.

[0036] In all embodiments, the stabilizing coating and / or the adhesion promoter coating can extend over more than 50%, preferably less than 98%, of the surface of the transfer element, as described in more detail in DE 10 2019 005 551 A1, for example.

[0037] In the present case, the feature components of the stabilizing 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 be excitable in different spectral ranges, in particular in the UV range and the IR range, or both can be excitable in the same spectral range, in particular in the UV range or the IR range. The luminescent feature components can be excitable separately and / or jointly, in particular with non-overlapping, partially overlapping, or overlapping excitation bands. The (paper) substrate can be translucent to the excitation light or contain an excitation light absorber, such as a UV or IR absorber.The stabilizing coating and / or the adhesion promoter coating may contain an excitation light absorber, such as UV or IR absorber, as a further component.

[0038] 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, when viewed from above onto the flat substrate. The same initially applies to the stabilizing coating. When viewed from above onto the flat substrate, an area of ​​the adhesion promoter coating or the stabilizing coating extending 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%. When viewed from above onto the flat substrate, an area of ​​the adhesion promoter coating extending beyond the edge of the transfer element can be larger than the area of ​​the stabilizing coating; this variant is particularly advantageous because it has a smaller layer thickness.The adhesion promoter coating and the stabilizing coating are applied only locally within the transfer element section. They cover less than 50% of the substrate front and back, respectively.

[0039] The substrate can contain, in the section, at least in the region of the transfer element, 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 translucent, particularly in the visual range and / or UV / IR range, i.e., 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 because the substrate then becomes more translucent. Furthermore, the thinning of the substrate can also be modulated or figuratively designed.This allows the security element to remain the same when viewed in reflected light, for example, under UV illumination. However, due to the varying thickness of the substrate, especially if a UV absorber is present in the substrate, a different additive color mixture results upon UV activation from the opposite side. Furthermore, a transfer element with its own carrier layer can be combined with a window or a hole in the substrate.

[0040] In addition to the stabilization coating with its first (and optionally third) feature component and the adhesion promoter coating with its second (and optionally fourth) feature component, a further stabilization or adhesion promoter coating with a further (fifth) feature component can be applied to the substrate in the section. The further stabilization or adhesion promoter coating is in particular a further stabilization coating with the same stabilization component or a further adhesion promoter coating with the same adhesion promoter component. The further stabilization or adhesion promoter coating can be printed in the aforementioned one work step or one of the two aforementioned work steps. The further stabilization coating is applied to the back of the substrate or the further adhesion promoter coating to the front of the substrate in a third orfourth pattern, preferably applied in regions, in particular in stripes. Regions of the further stabilizing or adhesion promoter coating can be surrounded by the stabilizing or adhesion promoter coating on at least two sides, preferably on exactly two sides or completely. The further stabilizing or adhesion promoter coating is also applied, as seen in plan view, both within the edge of the transfer element and extending beyond it.

[0041] 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.

[0042] In at least one region of the section of the substrate, a multilayer structure is formed, comprising four layers arranged one above the other: the stabilizing coating, the substrate, the adhesion promoter coating, and the transfer element. The layers are arranged such that the substrate is located at least partially, preferably completely, between the stabilizing coating and the adhesion promoter coating and is, in particular, enclosed in this region.

[0043] The pattern of the stabilizing coating and the pattern of the adhesion promoter coating can be formed and / or arranged as follows, particularly when viewed from above onto the planar substrate: at least partially, preferably completely, in register with one another; at least partially, preferably completely, complementing one another to form one or more motifs, particularly in transmitted light; at least partially, preferably completely, not overlapping; and / or at least partially, preferably completely, overlapping. Alternatively or additionally, the pattern of the stabilizing coating and the pattern of the adhesion promoter coating can form a security feature selected from a common front / back feature, a common incident / transmitted light feature, or a common transmitted light feature.

[0044] The pattern of the stabilizing 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, as seen in a plan view of the flat substrate. In this way, a high diversity of variants of the security element can be produced. The pattern(s) can be formed, for example, by means of recesses in the stabilizing coating and / or in the adhesion promoter coating. For example, the stabilizing coating and / or the adhesion promoter coating can have, as the 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-surface pattern of the stabilizing coating and / or the adhesion promoter coating, in particular also under the transfer element, for example a pattern with recessed numbers, can also be formed.

[0045] Just to clarify, it is stated once again that production-related fluctuations - regardless of the specific size - are individual for each security element and therefore do not constitute a security feature in the present sense.

[0046] The security element is particularly suitable for improving the forgery security of security papers for banknotes, but also for other valuable documents, such as ID cards, passports, etc. The preferred substrate is paper, particularly preferably banknote paper, e.g. as a paper web or as a paper sheet. Theoretically, however, substrates made of polymers or composite products, such as hybrid composites such as film-paper composites or film-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 than the composite, makes the use of a stabilizing coating on the back necessary to maintain the flatness of the substrate.The substrate can be a single-layer or multi-layer substrate.

[0047] A further embodiment relates to a security document, in particular a banknote, comprising a security element according to one of the embodiments described here.

[0048] The invention will be explained in more detail below using exemplary embodiments with reference to the accompanying drawings, which also disclose features essential to the invention. These exemplary embodiments are for illustrative purposes only and are not to be interpreted as limiting. For example, a description of an exemplary embodiment with a plurality of elements or components should not be interpreted as meaning that all of these elements or components are necessary for implementation. To avoid repetition, identical or corresponding elements in different figures are designated by the same reference numerals and are not explained more than once. In the figures: Fig. 1 schematically shows a cross-sectional view of an exemplary security element obtainable using the method of embodiments, Fig. 2 schematically shows a cross-sectional view of an exemplary security element obtainable using the method of embodiments, Fig. 3 schematically shows a cross-sectional view of an exemplary security element obtainable using the method of embodiments, Fig. 4 schematically shows a cross-sectional view of an exemplary security element obtainable using the method of embodiments, Fig. 5 schematically shows a cross-sectional view of an exemplary security element obtainable using the method of embodiments, Fig. 6 schematically shows a cross-sectional view of an exemplary security element obtainable using the method of embodiments, Fig. 7 schematically shows a cross-sectional view of an exemplary security element obtainable using the method of embodiments, Fig.8a and 8b schematically show the security element of the . Fig. 7 in incident light and in transmitted light, Fig. 9a to 9c schematically show a plan view of the security element of the Fig. 7 , in a view in transmitted light, a view of the front side of the security element / substrate in reflected light and a view of the back side of the security element / substrate in reflected light, and Fig. 10 schematically shows steps of the method of embodiments.

[0049] In the following, exemplary embodiments are described, with particular emphasis on the differences between the exemplary embodiments.

[0050] Fig. 1 schematically illustrates a cross-sectional view of an exemplary security element 10 obtainable by the method of embodiments, whose steps a) to c) in Fig. 10 with steps S1 to S3.

[0051] In step a), an elongated, flat, rectangular substrate 12 with two long and two short sides and a back side 15 and a front side 14 is provided (step S1 of the Fig. 10 ). The (paper) substrate 12 has a section 16 in which, in step b), a stabilizing coating 17 is applied to the back 15 of the substrate and an adhesion promoter coating 18 is applied to the front 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 the Fig. 10 ). For example, in section 16, an optically variable strip is applied as a transfer element, which connects the long sides of the rectangular substrate 12 in section 16 and which itself can already have a multitude of different security features.

[0052] In the present example, the stabilizing coating 17 and the adhesion promoter coating 18 are printed in step b), preferably applied by screen printing, either in two or a single operation. With just one operation, the quality for processing and circulation is promoted cost-effectively and an optical security feature is created. In examples in which several printing units are used, e.g. one printing unit for the stabilizing coating and another printing unit for the adhesion promoter coating, the printing units can be controlled in the longitudinal direction using an averagely printed register mark. The registration mark can be detected and read using optical reflection scanning. To enable synchronization of the printing units, the circumferential position of the respective printing unit can be determined. This can be done using a scanning device on the lateral screen holder.The same registration mark can be used for applying the transfer element if this step is performed in a separate operation on a separate machine.

[0053] In section 16, an optically variable multi-layer structure is formed from the stabilizing coating 17, the substrate 12, the adhesion promoter coating 18 and the transfer element 19, as can be seen from the Fig. 1can be seen. The stabilizing coating 17 contains, for example, 80-95% of a conventional stabilizing component and additionally a fluorescent dye with approximately 1% dry weight fraction. It is formed, for example, with a width of 21 mm. A standard primer, which is also provided with less than 10%, in particular 2%, fluorescent dye, is used as the adhesion promoter coating 18. The adhesion promoter coating 18 is applied, for example, with a width of 18 mm. 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 stabilizing coating 17. Preferably, both fluorescent dyes 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 comprises sublayers not shown, in particular an adhesive layer, a relief structure layer with a reflection-enhancing layer configured in certain regions, and a film layer. Since the figures are very schematic, it should be noted that the multilayer transfer element 19 is significantly thicker (> 10-20 µm) than the adhesion promoter layer 18, whose maximum thickness is in the single-digit µm range (for example, 0.25 µm to 5 µm), or the stabilizing coating 17, whose maximum thickness is in the low double-digit µm range (approximately 2 µm to 20 µm or 2-6 µm). The stabilizing coating 17, the adhesion promoter coating 18, and the transfer element 19 are positioned on the substrate 12 such that the distance to the nearest short side of the substrate 12 is at least 25 mm.

[0054] Viewed from above onto the flat substrate, the transfer element 19 is delimited on at least a first and a second side 20, 21 by an edge 22 and is arranged in step c) with its edge 22 lying within the section 16 on the adhesion promoter coating 18. The stabilizing coating 17 is arranged in step b) such that, after the application of the transfer element 19 in step c), it extends beyond the edge 22 on the first and second sides 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 each over the edge. The adhesion promoter coating 18 is arranged in step b) such that after the application of the transfer element 19 on the first and second sides 20, 21 of the transfer element 19, it extends over the edge 22 of the latter. In the example from Fig. 1The adhesion promoter coating 18 extends in strips on both sides by 2 mm over the edge.

[0055] The stabilizing coating 17 and the adhesion promoter coating 18 can optionally each be formed with two patterns 30 which, after step c), i.e. after the application of the transfer element 19, are positioned at least partially outside the edge 22 of the transfer element 19. The patterns 30 of the stabilizing coating 17 and the adhesion promoter coating 18 are arranged in this example on both sides 20, 21 of the transfer element. The patterns 30 are shown as a recess in the figures. A pattern can also actually be formed as a geometric, character-like or motif-like recess in the coating in question (negative representation of the geometric shape or motif). However, the patterns 30 of the stabilizing 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 ora 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 (+ / - 1 mm) of the width of the coating along the strip in plan view. The patterns 30 of the stabilizing coating 17 and the patterns 30 of the adhesion promoter coating 18 are arranged in register with one another at least partially, i.e. in particular in the direction in which the substrate 12 extends in the figure and preferably additionally also perpendicular thereto. In the example of the . Figure 1 the patterns 30 on the front side 14 and on the back side 15 are identical and completely aligned with each other, i.e. both are congruent in plan view.

[0056] The security element 10 provided for in section 16 has, as Fig. 1shows a symmetrical structure. Both coatings 17, 18 extend beyond the transfer element 19 on both sides 21, 22 and extend with the same width on both sides. Furthermore, the patterns 30 arranged on the front and back sides 14, 15 are congruent.

[0057] In a first variant, the substrate 12 is transparent or translucent to UV light, in particular just as translucent as to visible light. In UV light, the observer sees an outer blue-emitting section, here 1.5 mm wide, 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, i.e., it can be recognized as a non-emitting recess in the inner red-blue section. If, on the other hand, the pattern 30 is a modulation of a coating edge, for example a sinusoidal one, the pattern is recognizable in plan view as a modulation of the local width of the section (or both sections). The optical effect of the security feature is thus independent of the viewing situation.The optical effect of the security feature is visible from both the front side 14 and the back side 15, and both in incident light (illumination from the viewing side) and in transmitted light (illumination from the side opposite the viewing side).

[0058] If the transfer element 19 has opaque regions, the sections and patterns 30 of the stabilizing 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 region of the transfer element 19, no emission is present from the front side in incident light (due to a lack of UV excitation). From the back side, the mixed color is visible in UV incident light, even in the opaque region. In UV transmitted light, no emission is visible when viewed from the back side (due to a lack of excitation) or from the front side (due to a lack of transmission). In transparent regions of the transfer element 19, however, the mixed color is visible to the viewer in UV light - again regardless of the viewing situation. Transparent regions of the transfer element 19 can preferably extend from edge to edge or be surrounded by an opaque region.Preferably, a transparent region is provided following the edge of the transfer element 19, which in particular surrounds a central opaque and / or translucent region.

[0059] In a second variant, the substrate 12 is absorbent for UV light or 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 the pattern 30) of the adhesion promoter coating 18 from the front side 14 and the blue emission (and / or the pattern 30) of the stabilizing coating 17 from the back side. In transmitted UV light, the viewer sees the blue emission of the stabilizing coating 17 from the front side and the red emission of the adhesion promoter coating 18 from the back side. The red-luminous section next to the transfer element 19 is 2 mm wide, the blue-luminous section is 3.5 mm wide. In plan view, in this example, the sections are strip-shaped 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 / non-luminous both in transmitted UV light and from the front in incident UV light.

[0060] Under UV light, the two coatings with their fluorescent substances form an attractive optical security feature that the observer can verify. Security can thus be increased – especially without additional production costs.

[0061] This example, and some other examples will be described, shows two variants relating to the (transparency or) translucency of the substrate for excitation and emission radiation (more mechanically: excitation and measurement signal). A comparable translucency can be present in the sense of the first variant across the entire (UV range as) excitation range and across the entire (VIS range as) emission range, or only selectively in one excitation band and, for example, the two emission bands. The comparable translucency can, for example, be in the range from 10 to 80% transmission, i.e., 80%, 60%, or 40% transmission for all ranges / 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 behavior in the sense of the first variant. The values ​​which are essentially for one range orA band of opaque second variant of a substrate is more of a borderline case, for example, with transmission <5% (<10%) in that region (or band). In principle, there are transitional situations—not described separately here—where the translucency becomes increasingly different. For example, one of the two emission colors would then be only faintly visible (20% transmission) while the other would remain unchanged (80% transmission).

[0062] Fig. 2 shows schematically 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. 1However, the adhesion promoter coating 18 only contains the pattern 30 in the part extending on side 20. The stabilizing coating 17 extends on side 21 of the transfer element beyond its edge 22 by a total of 6 mm and only contains its pattern 30 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 exactly up to the edge 22 or, for example, 1 mm beyond the edge 22).

[0063] In this way, an asymmetrical arrangement is realized. One or both coatings 17, 18 extend beyond the edge of the transfer element 19 to varying degrees, depending on the side. The patterns 30 are now also 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.

[0064] Under UV light, the two coatings with their fluorescent substances form an even more easily detectable and thus verifiable optical security feature. Security can thus be increased without additional production costs. The security feature displays three different colors (first color, second color, and mixed color).

[0065] In a first variant, the substrate 12 is again transparent or translucent to UV light. In UV light, the observer sees an outer blue section (4 mm wide) and an inner red-blue (magenta) section (2 mm wide) on side 21 of the edge 22. On the other side 20 of the edge 22, the observer 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 omitted. The stabilizing coating 17 can be applied in such a way that it does not extend beyond the edge 22 on side 20, i.e., ends before the edge 22 or ends at the edge 22. In this case, only a red section is visible to the left of the transfer element 19 (on side 20).

[0066] If the substrate 12 is again absorbing UV light in a second variant, the visible luminescence changes compared to the design according to Figure 1 less. Viewed from the back 15 and illuminated with UV light, the observer sees the red luminescent coating 17 as a stripe with the pattern 30, for example, as an internal recess or as an edge modulation. Viewed from the front, the observer sees the blue luminescent adhesion promoter coating 18 as a stripe with its possibly different pattern 30.

[0067] The previously discussed aspects of the dependence on opaque and / or transparent areas of the transfer element and the viewing situation apply analogously and will therefore not be repeated here or in the following. For simplicity, in this and the following examples, the same luminescent colors in the same coating are always used; of course, the color and the associated coating are freely selectable.

[0068] Fig. 3 schematically illustrates an exemplary security element 200, which is produced as a variant of the security element 100. The security element 200 is also constructed asymmetrically in section 16. Compared to the security element 100, it is primarily formed laterally inverted.

[0069] In the finished security element 200, the adhesion promoter coating 18 contains its second pattern 30 only in the part extending beyond the edge 22 of the transfer element 19 on the side 21 of the transfer element 19. The stabilizing coating 17 contains its first pattern 30 only in the part extending beyond the side 20. In this way, an asymmetric arrangement of the coatings 17, 18 is already realized. It can be seen that the coatings 17, 18 also extend - laterally inverted to Fig. 2 - extend beyond the edge at different distances. The patterns 30 are in turn provided on different sides of the transfer element 19 and on different sides of the substrate 12.

[0070] The sections and their colours that are visible depending on the viewing situation are analogous to Figures 1 and 2 Three variations, independent of each other and of the specific figure, are briefly described using Fig. 3 described.

[0071] The pattern 30 in the adhesion promoter coating 18 can consist of a plurality of similar (or different) pattern elements, such as numbers, digits, or symbols. The pattern elements are arranged next to one another in plan view—for example, following the edge 22.

[0072] Secondly, the pattern 30 of a coating, here the adhesion promoter coating 18, can be designed, for example, as a strip-shaped recess such that it is aligned with an edge of the other coating, here ending congruently with the right edge of the stabilizing coating 17. The non-luminescent recess thus borders two differently colored / luminescent sections (blue luminescent on the right, mixed-color luminescent on the left).

[0073] Thirdly, one of the coatings could be modulated in width on one or both sides. For example, the stabilizing coating 17 on the left side 20 of the edge 22 of the transfer element 19 could have a modulated edge, for example a sinusoidal one, as a pattern 30. The amplitude of the modulation preferably corresponds to half or the entire width of the section of the stabilizing coating 17 that extends beyond an edge of the adhesion promoter coating 18 or beyond the edge of the transfer element. In plan view, the width of the red luminescent section thus 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 plan view from the front side 14, in particular when amplitude = entire width (or be continuous, in particular when modulated with half the section width).

[0074] Fig. 4schematically shows an exemplary security element 300 obtainable with the method of embodiments. In comparison to the example of Fig. 1, i.e. to the security element 10, in the finished security element 300 the adhesion promoter coating 18 and the stabilizing coating 17 each extend further beyond the edge 22 on both sides 21, 22 of the transfer element 19, the adhesion promoter coating 18 by a total of 3.5 mm, the stabilizing coating by a total of 8 mm. The stabilizing coating 17 therefore extends 4.5 mm beyond the adhesion promoter coating 18 on side 21 of the transfer element 19. The adhesion promoter coating 18 and the stabilizing coating 17 each contain different or differently arranged patterns 30 in the part extending on both sides 20, 21. This 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 side 20 of the transfer element 19 are arranged in register with each other, but do not have to be identical. The two patterns 30 provided on side 21 of the transfer element 19 are arranged completely (or partially) without overlap. Even patterns arranged without overlap can be identical or different. The patterns 30 are considered below as recesses or as patterns that form recesses; further alternatives have already been mentioned.

[0075] Under UV light, on the left side 20 of the transfer element 19 (from the inside out), a section in the mixed color is visible, in which colorless cutouts are recognizable, and a section that appears red. Only when the cutouts are congruent are the entire cutouts colorless or non-luminescent. The colorless cutout only borders the section with the mixed color (white cutout in the magenta section). If, however, the patterns 30 on this side 20 are only partially overlapping, additional cutout portions that optionally glow red or blue can be created in the mixed-color section.

[0076] 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 patterns 30 of the two coatings 17, 18 are arranged without overlap. Both patterns are visible and can complement each other to form an overall motif. For example, a rectangular recess 30 in the adhesion promoter layer 18 and a circle as a pattern 30 of the stabilizing coating 17 complement each other to form a red, illuminated letter "i."

[0077] Fig. 5 schematically shows another exemplary security element 400 that can be obtained using the method of embodiments. In comparison to the example of Fig. 1, i.e., to the security element 10, in the finished security element 400, the adhesion promoter coating 18 and the stabilizing coating 17 each extend further beyond the edge 22 of the transfer element 19 on side 21 of the transfer element 19, the adhesion promoter coating 18 by a total of 9 mm, the stabilizing coating by a total of 6 mm. The adhesion promoter coating 18 therefore extends - with a section 3 mm wide - laterally from side 21 beyond the stabilizing coating 17. On side 201 of the transfer element 19, the coatings extend less far beyond the edge 22, for example, 2.5 and 1 mm. The adhesion promoter coating 18 and the stabilizing coating 17 each contain pattern 30 in the part extending on both sides 20, 21 of the transfer element.

[0078] In this way, an asymmetrical arrangement of both coatings is realized in the structure of the security element 400 in section 16. The patterns 30 are provided on both sides of the transfer element 19 and on 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 back 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 change in the width of the two sections, either repeated along the edge or locally different, is used as the pattern. Preferably, the change in the width of the sections is repeated such that along the edge 22, the color regularly changes between two or three of the colors (for example, red / blue / red... or red / magenta / blue / magenta / red...).

[0079] Fig. 6schematically shows another exemplary security element 500 obtainable with the method of embodiments. In comparison to the example of Fig. 5 In this example, the coatings are arranged almost symmetrically to each other. However, the coatings 17, 18 (and / or the patterns 30) are both arranged asymmetrically to the transfer element 19 or its edge 22.

[0080] In all embodiments, the substrate 12 is preferably a paper substrate. Paper substrates are translucent to visible light and can be designed to absorb UV light. For paper substrates, it is known that the transmissivity of the substrate can be locally varied, for example, by locally varying the thickness of the substrate, so that the viewer recognizes a motif (watermark) in transmitted light. In all embodiments, patterns 30 in one or both coatings can be replaced by a substrate pattern, or a substrate pattern can be additionally provided. Figure 6For example, the two patterns 30 on side 21 of edge 22 of 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 the visibility of luminescence through the substrate. For example, a watermark in the paper substrate is visible in transmitted UV light as a pattern 30 recognizable in color (the hue of the mixed color varies locally) and in the brightness of the fluorescence (the intensity of the light varies locally).

[0081] In all embodiments, the transfer element 19 can be a transfer strip or a transfer patch. In the case of a transfer patch, for example in the shape 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 a rectangle or apple, and / or - as shown in the figure - can be arranged asymmetrically, at least in the direction of the cross-section shown. The coatings 17, 18 could therefore be designed with a larger surface area - for example, both also as ovals - but shifted in (the same or) different directions compared to the oval of the transfer element in a plan view.

[0082] Fig. 7schematically illustrates an exemplary security element 600 obtainable using the method of embodiments. The arrangement of the coatings 17, 18 is again designed asymmetrically to extend beyond the edge 22 of the transfer element 19.

[0083] In contrast to the variants presented so far, the stabilizing coating 17 additionally contains a 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 that can either be located completely within the edge 22 or simultaneously within the edge 22 and outside the edge 22 (the pattern extends beyond the edge). DE 10 2019 005 551 describes examples of such at least internal patterns for a stabilizing coating in more detail, in particular with regard to the Figures 4 to 6which can be used as patterns in the present sense in one or both coatings.

[0084] The coatings 17, 18 in Fig. 7 may have a dye as the feature component or as an additional feature component. Likewise, the luminescent feature components of coatings 17, 18, such as the red and blue fluorescent feature substances, could also be visible in the visual range. For simplicity, it is again assumed that in the visual range, the stabilizing coating 17 is visible as red and the adhesion promoter coating 18 as blue.

[0085] The colors, of course, are freely selectable here as in any other figure. For example, yellow and blue (with the corresponding (green) mixed color) can be used as luminescent colors.

[0086] The behavior in the visual area is determined by Figure 7described, but is transferable to the other figures.

[0087] In VIS incident light, ie in incident light with visible light, the observer sees Fig. 7from the back 15, the coating 18 with the patterns 30, 31 and from the front 14, the coating 17 with the pattern 30. This applies within the edges 22 of the transfer element 19, insofar as the transfer element 19 is generally or partially transparent, and fundamentally outside the edges of the transfer element 19. In this example, the patterns 30 provided to the side of the side 21 of the transfer element 19 and on the front and back 14, 15 of the substrate are arranged in register and are identical. In VIS transmitted light, the patterns 30 from the front and back 14, 15 are recognizable in the section on side 21 of the transfer element 19. For example, the patterns 30 are recognizable in a mixed color tone (purple) if they are formed by the coatings 17, 18, or colorless in a section with a mixed color tone (purple) if they are formed by cutouts.The coatings 17, 18 provide the viewer with an easily verifiable top-down / see-through security feature.

[0088] Starting from Fig. 7A non-claimed embodiment with only magnetic feature components will now be described. The adhesion promoter coating 18 can comprise a first magnetic feature component, and the stabilizing coating 17 can comprise the same or a stronger (more strongly 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 generated. For example, coding can be carried out (on one or both of the sides 20, 21) in plan view along the edge 22 of the transfer element 19 by one or both of the coatings 17, 18 alternately extending beyond the edge and not extending beyond it. Likewise, such a magnetic coding could be formed only inside or only outside the edge. Shows Fig. 7For example, the cross-section through a location with a recess 31 can be seen from a top view and followed by a location without a recess. Alternating locations with and without recesses creates a magnetic coding, which Figure 7 in plan view runs along the edge 22 or into the drawing plane. If recesses 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 magnetic strengths (0 or 1 / 4 or 5) can be coded locally. Coding is achieved by the local magnetic strength and / or by the size of the sections (with equal strength). Coding can then be achieved, for example, by appropriately arranged patterns, for example, with the magnetic strength sequence 4, 0, 5, 0, 1, 4, etc.

[0089] In Fig. 8a is a security element 600 in reflected light and in Fig. 8bshown schematically in transmitted light.

[0090] 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 viewer of the front side. The transfer element 19 can, for example, be opaque. The viewer then sees a magenta-illuminating 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 the left side, a red-illuminating section follows the magenta-illuminating section. Only upon rear-side UV excitation and viewing does the viewer also see the pattern 31, in the example as a blue-illuminating section between the magenta-illuminating sections that extend beyond the edge of the transfer element.

[0091] If the security element 600, as in Fig. 8b As shown, if the back side 15 is irradiated with UV light 50 and the fluorescence 60 is viewed from the front side 14, the viewer sees the same (with a transparent substrate 12) as in reflected light. However, as already mentioned, the appearance or visibility of the fluorescence can be controlled by means of appropriate absorbers (UV absorbers or VIS absorbers)—particularly in the substrate 12 or the coatings.

[0092] In Fig. 9a to 9c is a security element 600, which is Fig. 7 can be designed, is shown schematically. In section 16 of the substrate 12, a strip is applied as the transfer element 19.

[0093] Fig. 9bshows the front side 14 of the security element 600. In section 16, indicated by the dashed lines, of the substrate 12, a security strip is applied as the transfer element 19 to the adhesion promoter coating 18. The adhesion promoter coating 18 extends asymmetrically—at least with its pattern 30—beyond the transfer element 19, here, for example, only or more on the right side. It comprises a fluorescent feature component. The pattern 30 is a repeating digit sequence "200." It comprises the digits or the digit sequence as pattern elements. The pattern elements can be connected to each other and / or to the strip-shaped section or—as shown—separated by a recess. The applied adhesion promoter coating 18 forms the pattern 30.If the feature component of the adhesion promoter coating 18 (or another of its components) is visually visible (optional), the viewer sees the adhesion promoter layer 18 in VIS incident light with its strip-shaped section, which preferably extends beyond the edge of the transfer element on at least one side, and with the repeating number sequence. For the sake of simplicity, the illustration assumes a transparent transfer element. However, the transfer element typically includes opaque and / or UV-absorbing and / or optically variable regions.

[0094] Fig. 9cshows the back side 15 of the security element 600. The stabilizing coating 17 is applied in a stripe-like manner to the back side 15. In addition, a pattern 30, as previously formed as a sequence of pattern elements, and a pattern 31 are formed by a recess in the stabilizing coating 17. The pattern 31 is designed as a geometric shape. The stabilizing coating 17 comprises the same fluorescent feature component (e.g., green) as the adhesion promoter coating, or a different fluorescent feature component (e.g., red and blue). If the stabilizing coating 17 is visible to the observer (optional), they see a stripe with a recess and a repeating sequence of numbers on only one side.

[0095] Fig. 9ashows the security element 600 in UV light when viewed from the front side 14. Both coatings 17, 18 fluoresce under UV light (UV incident light or UV transmitted light). The patterns 30, 31 become visible to the observer. The patterns 30, located on different sides of the substrate complement each other to form an overall motif. For this purpose, the patterns 30 are not arranged overlapping in plan view. If the feature components in both coatings 17, 18 are of the same color, the pattern 31 is recognizable as a darker, less intensely luminous geometric shape in the brightly luminous stripe. For different fluorescent coatings 17, 18, the patterns 30 are recognizable alternating with the corresponding color (blue 200, red mirror-inverted 200, etc.). The stripes of the two coatings 17, 18, which are arranged in a completely overlapping manner, light up in a mixed color (red+blue => magenta).The pattern 31 can then be recognized, for example, as a blue, glowing geometric shape in the magenta stripe. The transfer element 19 should be shown in the example. Fig. 9c i.e., at least in the area of ​​pattern 31, i.e., the middle third, it must actually be transparent. Non-transparent areas, particularly in the upper and / or lower third of the transfer element 19, could—as previously described, depending on the viewing situation—prevent the excitation of fluorescence and / or the visibility of the fluorescence. List of reference symbols

[0096] 10Security element 12Substrate 14Front 15Back 17Stabilization coating 18Adhesion promoter coating 19Transfer element 20Side 21Side 22Edge 30Pattern 31Pattern 100Security element 200Security element 300Security element 400Security element 500Security element 600Security element

Claims

1. Method for producing a security element (10; 100; 200; 300; 400; 500; 600) with a security feature, having steps as follows: a) providing a two-dimensionally extended substrate (12), which has a front side and a rear side (14, 15) and at least one portion (16); b1) applying a stabilization 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); wherein, as seen in plan view of the two-dimensional substrate (12), - the transfer element (19) is arranged on at least a first and a second side (20, 21) in a manner delimited by an edge (22) lying within the portion (16), and - the stabilization coating (17) and the adhesion promoter coating (18) are each formed so as to extend on at least one of the first and second sides (20, 21) of the transfer element (19) beyond the edge (22) thereof; wherein the stabilization coating (17) and the adhesion promoter coating (18) each comprise a feature component, wherein the stabilization coating (17) and the adhesion promoter coating (18) together form the security feature or two independent security features, and wherein the feature component of the stabilization coating (17) is a luminescent feature component, characterized in that the feature component of the adhesion promoter coating (18) is a luminescent feature component.

2. Method according to Claim 1, wherein the stabilization coating (17) and / or the adhesion promoter coating (18) are formed so as to extend asymmetrically beyond the edge (22) of the transfer element, wherein in particular - the stabilization coating (17) on the first and the second side (20, 21) of the transfer element (19) extends beyond the edge (22) thereof differently or only on one of the two sides (20, 21); and / or - the adhesion promoter coating (18) on the first and the second side (20, 21) of the transfer element (19) extends beyond the edge (22) thereof differently or only on one of the two sides (20, 21).

3. Method according to Claim 1 or 2, wherein the stabilization 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. Method according to Claim 3, wherein the stabilization coating (17) and / or the adhesion promoter coating (18) - are formed outside the edge (22) with the pattern (30, 31), and / or - are formed within the edge (22) with the pattern (30, 31).

5. Method according to any of Claims 1 to 4, wherein - the stabilization coating (17) and the adhesion promoter coating (18) are arranged in register with one another in at least one direction, preferably in two mutually perpendicular directions; and / or wherein the stabilization coating (17) and / or the adhesion promoter coating (18) are formed in register in at least one direction, preferably in two mutually perpendicular directions, with respect to the transfer element and / or to a pattern of the substrate (12).

6. Method according to any of Claims 1 to 5, wherein the optically active feature component is visible to the viewer on irradiation, in particular in the UV range, in the visible range or in the IR range, and preferably is visible to the viewer only on irradiation in the UV range or IR range; or the machine-readable component is only machine-recognizable, in particular magnetically recognizable, or is only machine-recognizable spectrally on irradiation, for example in the UV range, in the visible range or in the IR range.

7. Method according to any of Claims 1 to 6, wherein the security feature is a machine-readable security feature, which - is machine-readable with a single measurement step, or - is machine-readable with a plurality of, preferably simultaneous, measurement steps, of different kind or different measurement situation, in particular measurement side and / or illumination side.

8. Method according to any of Claims 1 to 7, wherein the transfer element (19) - has a basic shape, wherein the basic shape is in particular a geometric basic shape, in particular a rectangle, circle, polygon or regular n-gon, or is a motif-like basic shape; and / or - is delimited either as a strip on exactly two sides by its two edges (22) or as a patch on the two sides by two portions of its circumferential edge (22); and / or - is an optically variable transfer element (19) having more than two transfer element layers, wherein an adhesion layer as transfer element layer connects the transfer element (19) to the adhesion promoter coating (18), and also having further transfer element layers, which are selected in particular from: + relief structure layer, in particular embossing varnish layer with embossed relief structure, and / or + reflection-increasing layer, which in particular follows the relief of the relief structure layer, and / or + colour-flopping transfer element layer, which in particular comprises at least one dielectric layer or comprises a layer with colour-flopping pigments, and / or + machine-readable feature layer, in particular with IR feature, phosphorescent feature or magnetic feature; + carrier layer, in particular composed of paper or plastic, which is preferably transparent.

9. Method according to any of Claims 3 to 8, wherein the stabilization coating (17) and / or the adhesion promoter coating (18) are applied, - having a geometric, character-like or motif-like cutout as pattern (31), and / or - having a pattern (30) which comprises repeating pattern elements, and / or - having a pattern (30) which comprises geometric, character-like or motif-like pattern elements, and / or - having at least one geometric or motif-like pattern (30, 31) which is distinct - in particular independent of the basic shape of the transfer element in the sense of Claim 8.

10. Method according to any of the preceding claims, wherein the larger area of the areas of the two coatings (17, 18) that extend 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 larger, more preferably between 1.25 and 4 times larger.

11. Method according to any of the preceding claims, wherein the stabilization coating (17) and the adhesion promoter coating (18), as seen in plan view of the two-dimensional substrate (12), at least partially do not overlap outside the edge (22), in particular in such a way that, preferably in transmitted light or in 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 and preferably complement one another to form an overall motif or to form a continuous motif.

12. Method according to any of the preceding claims, wherein - the stabilization coating (17) and / or the adhesion promoter coating (18) are printed, in particular by means of screen printing; and / or - the stabilization 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 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); is applied after the adhesion promoter coating (18) and before the transfer element (19); or is applied after the adhesion promoter coating (18) and after the transfer element (19).

13. Method according to any 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% to 10%, more preferably between 0.1% to 3%.

14. Method according to any of the preceding claims, wherein - the luminescent feature components are luminescent, preferably fluorescent or phosphorescent, colourants, preferably luminescent dyes or luminescent pigments; and / or - the luminescent feature components are each excitable in different spectral ranges, in particular in the UV range and in the IR range, or both are excitable in the same spectral range, in particular in the UV range or in the IR range; and / or - the luminescent feature components are excitable separately from one another and / or jointly, in particular with non-overlapping, partially overlapping or overlapping excitation bands; and / or - the substrate (12) is translucent for the excitation light or contains an excitation light absorber, such as UV or IR absorber; and / or - the stabilization coating (17) and / or the adhesion promoter coating (18) additionally contains an excitation light absorber, such as UV or IR absorber.

15. Method according to any of the preceding claims, wherein - the adhesion promoter coating (18), as seen in plan view of the two-dimensional substrate (12), extends by 0.5 to 24 mm beyond the edge (22) of the transfer element (19), preferably by 1 to 12 mm; and / or - the stabilization coating (17), as seen in plan view of the two-dimensional substrate (12), extends by 0.5 to 24 mm beyond the edge (22) of the transfer element (19), preferably by 1 to 12 mm; and / or - as seen in plan view of the planar substrate (12), an area of the adhesion promoter coating (18) or of the stabilization coating (17) that extends beyond the edge of the transfer element (19) corresponds respectively to less than 150% of the area of the transfer element, preferably less than 100%, more preferably between 5% and 95% per cent; - as seen in plan view of the planar substrate (12), an area of the adhesion promoter coating (18) that extends beyond the edge of the transfer element (19) is larger than the extending area of the stabilization coating (17); and / or - the adhesion promoter coating (18) and the stabilization coating (17) each cover less than 50% of the substrate front side and substrate rear side, respectively.

16. Security element, in particular in the form of a security paper or a banknote, wherein the security element comprises features as follows: a two-dimensionally extended substrate (12), which has a front side and a rear side and at least one portion (16); a stabilization coating (17) in the portion (16) on the rear 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 adhesion promoter coating (18); wherein, as seen in plan view of the two-dimensional substrate (12), - the transfer element (19) is delimited on at least a first and a second side (20, 21) by an edge (22) lying within the portion (16), and - the stabilization coating (17) and the adhesion promoter coating (18) are each formed so as to extend on at least one of the first and second sides (20, 21) of the transfer element (19) beyond the edge (22) thereof; wherein the stabilization coating (17) and the adhesion promoter coating (18) each comprise a feature component, wherein the stabilization coating (17) and the adhesion promoter coating (18) together form the security feature or two independent security features, and wherein the feature component of the stabilization coating (17) and the feature component of the adhesion promoter coating (18) are luminescent feature components.

17. Security document, in particular security paper or banknote, comprising a security element (10; 100; 200; 300; 400; 500; 600) according to Claim 16.

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