WO2008135174A1

WO2008135174A1 - Security paper

Info

Publication number: WO2008135174A1
Application number: PCT/EP2008/003305
Authority: WO
Inventors: Peter Schiffmann; Reinhard Plaschka; Manfred Heim; Theodor Burchard; Karin Winkler
Original assignee: Giesecke & Devrient Gmbh
Priority date: 2007-05-04
Filing date: 2008-04-24
Publication date: 2008-11-13
Also published as: EP2147156B1; DE502008001999D1; DE102007040865A1; ATE491067T1; EP2147156A1; RU2009144392A; RU2428536C1

Abstract

The invention relates to a security paper for producing security documents or valuable documents. Said paper comprises a film element (18) which is transparent in at least some sections and which is freely accessible through the security paper (14) on at least one side of the security paper (14) in at least sections (16). The invention is characterized in that the film element (18) is connected to the security paper (14) via an adhesive layer (20) which is highly transparent and clear in the area of the freely accessible sections (16).

Description

security paper

The invention relates to a security paper for the production of security or value documents with an at least partially transparent film element which is freely accessible at least in some areas on at least one side of the security paper through the security paper. The invention further relates to an associated production method for the security paper, a value document with such a security paper as well as a film element for such a security paper or document of value.

Value Documerite, such as banknotes, identity cards and the like, are often provided for security with security elements that allow verification of the authenticity of the value documents and also serve as protection against unauthorized reproduction.

Increasingly transparent security features, such as transparent windows in banknotes, are becoming increasingly attractive. To produce a window, a film provided on all sides with an adhesive layer is applied to a banknote in order to close a previously inserted through opening. Typically, the film is provided with a security feature, such as a hologram or an optically variable coating.

Based on this, the object of the present invention is to improve a security paper of the type mentioned above with regard to the visual appearance of its window area and at the same time to increase the counterfeit protection of the security paper.

BESTATIGUNGSKOPIE This object is achieved by the security paper having the features of the main claim. A value document, a film element and a manufacturing method for the security paper are specified in the independent claims. Further developments of the invention are subject matter of the dependent claims.

According to the invention, it is provided in the case of a generic security paper that the film element is connected to the security paper via a highly transparent and clearly formed adhesive layer in the region of the freely accessible subareas. The freely accessible portions of the film element are often referred to in this description as window areas, regardless of whether the film element is disposed inside or on a surface of the security paper. If a film element arranged on a surface of the security paper is freely accessible through the security paper in a subarea, the security paper in this subarea contains a continuous opening extending up to the film element, to which reference is also often expressly made.

The invention is based on the idea to improve the visual appearance of the window area by an optimized design of the adhesive layer, with which the film element and the security paper are connected. As a result, the counterfeit protection of the security paper is thereby also increased, since a visual or mechanical inspection of the window area can be performed better and more reliably than in the prior art. Due to the required specific properties in terms of resistance, suitability for certain application methods and the required layer thickness, it is often difficult to realize an adhesive coating with a high transparency and low turbidity. union. Rather, the present inventors have recognized that the adhesive coating often scatters or mattes and thus reduces the transparency and clarity of the film element. Known see-through windows in banknotes often appear as a result in transparency with low transparency or with a cloudy visual appearance, which ultimately amounts to a reduction in counterfeit protection, because the visual or mechanical inspection of the see-through window or arranged in this area security element is impaired.

In a preferred variant of the invention, it is provided that the adhesive layer has, for at least one of the freely accessible partial regions, a recess which essentially surrounds the region of the partial region. Advantageously, the adhesive layer has a recess in the form of the freely accessible portion, which is 1 mm to 2 mm smaller or 1 mm to 2 mm larger than the portion is formed. On the one hand, this measure achieves a secure connection between the film element and the security paper and, on the other hand, ensures excellent transparency and clarity of the window area, since at most a narrow circumferential adhesive edge remains in the region of the opening.

In addition, it can be provided that the adhesive layer in the region of at least one of the freely accessible partial regions next to the recess has a pattern region in which the adhesive layer is applied in the form of patterns, characters or a coding. In this case, a colored adhesive layer can be used with a visible in the visible, infrared and / or ultraviolet color. The adhesive layer can thereby be used in the window area as a decorative design element, for displaying information and / or as a further security feature. According to another likewise advantageous variant of the invention, the adhesive layer in the region of at least one of the freely accessible partial regions has a thin region with a reduced layer thickness, wherein the layer thickness is reduced in particular to less than half the layer thickness outside the thin region. This measure also significantly increases the transparency and clarity in the window area.

The adhesive layer and the recess or the thin region can merge along a sharp boundary, or can have a smooth, continuous transition.

In a further advantageous variant of the invention, the adhesive layer is formed from a low refractive index adhesive. A low refractive index according to the invention is present if it is less than 1.5, particularly preferably less than 1.4.

In some embodiments, it is advisable to deactivate the adhesive of the adhesive layer in the area of at least one of the freely accessible partial areas, so as to reduce the tack of the adhesive layer. Such deactivation can be carried out for example by a thermal treatment or by UV irradiation.

According to a further preferred variant of the invention, the adhesive of the adhesive layer is smoothed in the region of at least one of the freely accessible partial regions. For this purpose, the adhesive may for example be thermally treated, in particular by exposure to laser radiation, or the adhesive layer is calendered in the window area after application of the film element. A smoothing of the adhesive layer can also be effected by partial or full-surface application of a lacquer layer in the region of at least one of the freely accessible partial regions.

A further advantageous variant of the invention is based on the use of two different adhesives with different properties side by side. For this purpose, the adhesive layer is formed in a viewing area, which comprises at least one of the freely accessible partial areas, by a highly transparent adhesive and in an adhesion area outside the viewing area by an adhesive having a high adhesive force. Since the two adhesives can each be optimized for their respective task, an adhesive layer with excellent optical properties in the field of vision and excellent adhesive properties in the adhesion area is produced.

According to yet another advantageous variant of the invention, the film element is connected to the security paper via an adhesive layer which has been precisely matched with the through-going opening. For this purpose, the adhesive layer is preferably formed in multiple layers, wherein a first adhesive layer of an activatable adhesive, in particular a hot melt adhesive is applied to the security paper, and a second adhesive layer is applied with a at least one of the freely accessible portions enclosing recess on the film element. Preferably, the recess is formed about 1 mm to 2 mm larger than the portion. After the film element has been applied to the security paper, the activatable adhesive is activated, thus producing the precisely matched, secure connection between the film element and the security paper. The continuous opening or the window region can be produced before or after the application of the activatable adhesive layer. In an advantageous variant of the invention, the security paper has a continuous opening which is closed by the film element. The film element is connected to the security paper via a highly transparent and clearly formed adhesive layer in the area of the through opening. The through-opening can already be produced in papermaking and have characteristic irregularities in the edge region. Alternatively, the through-opening can be made even after papermaking with a sharp edge, z. B. by punching or cutting, especially laser beam cutting produced. The film element may, in particular, be a patch applied to the security paper or an applied film strip with a width of several millimeters up to a width of about 30 mm.

In another likewise advantageous variant of the invention, the film element is at least partially embedded in the security paper and freely accessible in window areas on one or both sides of the security paper, wherein the film element is connected to the security paper via a highly transparent and clearly formed adhesive layer in the region of the window areas , In particular, the film element represents a narrow security strip or a wide security band with a width of up to about 30 mm. For example, the film element may be in the form of a window security element, such as a window security thread, which at certain window areas on one side of the security paper emerges and is freely accessible there. The film element can also form a pendulum security element, such as a pendulum security thread, which alternately emerges in certain window areas on opposite sides of the security paper and is freely accessible there. In an advantageous variant, the security paper is embodied as a single layer, wherein the film element is at least partially embedded in the one paper layer. According to other likewise advantageous variants, the security paper is formed in two or more layers and the film element is at least partially embedded in one of the paper layers. A further advantageous possibility is to embed the film element at least partially between two of the paper layers in a two- or multi-layered security paper.

The film element expediently has at least one security feature, which is preferably arranged in one of the freely accessible subregions. The security feature is in particular a diffractive structure, such as a hologram or a hologram-like diffraction structure, a matt structure, a metallization, a perforation, a lens or micromirror structure, a micro-optical system, in particular a micro-optical moire magnification arrangement, a thin-film element, a polarization filter or a Imprint formed, which has at least one substance with optically variable, luminescent, electrically conductive or magnetic properties.

The invention also includes a value document, such as a banknote, an identification card and the like, with a security paper of the type described and a film element for a security paper or a value document of the type described.

The invention further comprises a method for producing a security paper or value document of the type described, in which a through opening is introduced into the security paper or document of value, an at least partially transparent film element is provided and provided with an adhesive layer which is highly transparent and clear formed in the region of the through hole, and in which the through-opening is closed with the film element.

The invention further includes a method for producing a security paper or value document of the type described, in which an at least partially transparent film element is provided, the film element is embedded at least partially in a security paper or value document, so that it is in window areas on one or both Pages of the security paper is freely accessible through the security paper, and in which the film element is provided with an adhesive layer, which is highly transparent and clear in the area of the window areas.

If, as described above, the adhesive layer is provided with a recess which essentially surrounds the region of the through opening or one of the window regions, the film element can be provided with a hydrophobic coating in the form of the desired recess before application of the adhesive layer to achieve local repulsion of the adhesive layer. The hydrophobic coating expediently has a surface tension of less than 30 × 10 ^-3 N / m.

Alternatively, a soluble washing ink in the form of the desired recess can be printed on the film element prior to the application of the adhesive layer, and the wash ink can be washed off with a solvent after application of the adhesive layer together with it. Further details of such a washing process, the Publication WO 99/13157 are taken, the disclosure of which is included in the present application in this respect.

The adhesive layer can also be removed only after the film application in the area of the continuous opening or a window area, for example by means of laser ablation. The adhesive layer can also be applied in structured form with the desired recess to the security paper or document of value, in particular printed.

It may be expedient to apply the adhesive layer in the area of the through opening or of a window area in a pattern area in the form of patterns, characters or a coding.

Furthermore, a method variant is preferred in which the adhesive layer is applied in the region of the continuous opening or a window region as a thin region with a reduced layer thickness. In this case, the adhesive layer is applied either with a soft, continuous transition between the adhesive layer and the recess or thin area or with a sharp boundary between the adhesive layer and the recess or thin area.

According to another variant of the method, the adhesive is deactivated in the area of the through opening or of a window area, in particular by thermal treatment or UV irradiation.

Alternatively, the adhesive of the adhesive layer can be smoothed in the area of the through opening or of a window area, in particular by thermal treatment or by calendering. In a likewise preferred variant of the method, the adhesive layer is provided partially or completely with a lacquer layer in the region of the continuous opening or of a window region.

According to a further variant, if in a viewing area comprising at least the continuous opening or a window area, a highly transparent adhesive is preferably applied to the film element and an adhesive of high adhesive force is applied to the film element in an adhesive area outside the field of view.

It is also preferred if a first adhesive layer made of an activatable adhesive, in particular a hotmelt adhesive, is applied to the security paper or document of value, and a second adhesive layer is applied to the film element with a recess enclosing the continuous opening or a window region, and the activatable adhesive is activated after application or embedding of the film element on or in the security paper or document of value. In this case, it is both conceivable to produce the continuous opening or the window area after the application of the activatable adhesive layer or, conversely, to apply the activatable adhesive layer after the continuous opening or the window area has been produced.

In addition to the advantages already mentioned in the visual appearance, which ultimately mean an increase in the protection against counterfeiting, improved design of security papers or documents of value can also be achieved by the design according to the invention. Especially in the embodiments with recesses, thin areas or deactivated adhesive areas, the adhesion of dirt on the window rear side is effectively suppressed and the risk of build-up of adhesive the counter-pressure rollers of a printing machine in the window area and the risk of blocking of substrates or cut banknotes in packs effectively countered.

Further embodiments and advantages of the invention are explained below with reference to the figures. For better clarity, a scale and proportioned representation is omitted in the figures.

Show it:

1 is a schematic representation of a banknote according to an embodiment of the invention,

2 shows a cross section through the banknote of FIG. 1 along the

Line H-II,

3 and 4 cross sections through banknotes according to further embodiments of the invention,

5 shows in (a) a cross section and in (b) a plan view of an embodiment with additional pattern area,

6 shows a cross section of a banknote according to a further exemplary embodiment of the invention,

Fig. 7 in (a) a conventional banknote with an applied

(B) a banknote with an adhesive layer smoothed after the film application, Fig. 8 shows an embodiment with a smoothed by a lacquer layer adhesive layer _/

9 shows an exemplary embodiment with an adhesive layer with two different adhesives with different specific properties,

10 in (a) to (d) intermediate steps in the production of a banknote with an exact registration of adhesive layer and bank note opening, and

Fig. 11 in (a) to (e) different designs according to the invention

Security papers with applied or embedded foil elements.

The invention will now be explained in more detail using the example of a banknote. Referring first to Figures 1 and 2, Figure 1 is a schematic plan view of a banknote 10 according to the invention, and Figure 2 is a cross-section through the banknote 10 taken along the line H-II of Figure 1.

The banknote 10 contains a see-through window 12 which is formed from an opening 16 passing through the banknote substrate 14 and from a film element 18 which closes the opening 16 and is at least partially transparent.

In the following, the invention is explained by way of example with reference to embodiments in which a film element 18 is arranged as in FIGS. 1 and 2 over a continuous opening 16 of a bank note and closes it. Of course, the invention is not limited to such embodiments. limited forms, but includes noble designs in which a film element is freely accessible at least in some areas on one or both sides of a security paper therethrough. For illustration, Fig. 11 shows some typical designs.

The illustration of FIG. 11 (a) corresponds to the design shown in FIGS. 1 and 2, in which a film element 114 is arranged above a through opening 112 of a security paper 110 and closes it. The film element 114 can not only be a flat patch with a certain outline shape, as shown in FIG. 1, but also, for example, a wide film strip which extends over the entire width or length of the security paper. Through hole 112 may have a sharp edge created by cutting or punching, as shown in Fig. 2, or also a papermaking edge portion 116 having characteristic irregularities as shown in Fig. 11 (a).

With reference to the representation of FIGS. 11 (b) and (c), the foil element 124 may also be partially embedded in the security paper 120 and in window regions 122 on one (FIG. 11 (c)) or on both sides (FIG. b)) of the security paper 120 freely accessible. For example, the foil element may be a windowed security thread that protrudes from one side of the security paper in certain areas of the window, or a pendulum security thread that alternately emerges in certain areas of the window on opposite sides of the security paper. The film element may also be a wider security tape having a width of up to about 30 millimeters. The window areas may be formed with a sharp edge (Fig. 11 (b)) or a characteristically irregular edge (Fig. 11 (c)). In addition to the embedding in single-ply security paper, an embedding of the film element into two-ply or multi-ply security paper is also possible. In this case, a film element 134 can be embedded between two paper layers 130-1, 130-2 of a security paper 130, as shown in FIG. 11 (d). In the illustrated embodiment, the film element 134 is freely accessible through an opening 132 in the first paper layer 130-1. Elsewhere, the foil member 134 may also be freely accessible from the opposite side of the security paper 130 through openings in the second paper ply 130-2.

In another configuration, as shown in FIG. 11 (e), the sheet member 144 is embedded in one of the paper sheets 140-1 of the security paper 140, and the paper sheet 140-1 with the embedded sheet member 144 is coated with another, for example, thinner paper sheet 140-1. 2 combined. Again, the film element 144 is freely accessible through the opening 142 in the first paper layer 140-1.

For all described designs comes as substrate material any type of paper into consideration, in particular cotton vellum paper. Of course, it is also possible to use paper which contains a proportion of polymeric material in the range of 0 <x <100% by weight.

Furthermore, it is generally conceivable, although not currently preferred, that the substrate material is a plastic film, for. B. a polyester film is. The film may also be monoaxially or biaxially stretched. The stretching of the film, inter alia, leads to it receiving polarizing properties that can be used as another security feature. It may also be desirable if the substrate material of the security paper is a multilayer composite having at least one layer of paper or a paper-like material. Such a composite is characterized by an extremely high stability, which is for the durability of the security paper or value document of great advantage.

It is also conceivable, however, to use a multilayer, paper-free composite material as the substrate material. These materials are also not preferred at present, but can be used with advantage in certain climatic regions of the earth.

All materials used as substrate material may have additives that serve as a mark of authenticity. In the first place luminescent substances are to be considered, which are preferably transparent in the visible wavelength range and in the non-visible wavelength range by a suitable tool, for. B. a UV or IR radiation emitting radiation source can be excited to produce a visible or at least detectable with auxiliary luminescence. Other security features can be used with advantage, as long as they do not affect the viewing of the imprint or only slightly.

The film element may be formed as a patch covering a partial area of the substrate or as a strip extending over the entire length or width of the security paper or value document. Suitable materials for the film are primarily plastics, in particular PET (polyethylene terephthalate), PBT (polybutylene terephthalate), PEN (polyethylene naphthalate), PP (polypropylene), PA (polyamide), PE (polyethylene). The film may also be monoaxially or biaxially stretched. In some embodiments, the opening 16 of FIG. 2 is already created in the manufacture of the security paper used for the banknote 10 and has a fibrous, irregular edge. Such an edge is characteristic of openings already made during sheet formation and can not be subsequently produced. Details of the production of the fibrous, irregular edge can be found in WO 03/054297 A2. In that regard, the disclosure of WO 03/054297 A2 is included in the present application. In other embodiments, the opening 16 is the production of paper by punching or cutting, for example by laser beam cutting produced.

The film element 18 is provided with one or more security features 26, for example with a diffractive structure, such as a hologram or a hologram-like diffraction structure, a matt structure, a metallization, a perforation, a lens or micromirror structure or the like. These security features are known as such and therefore not shown in the following figures.

In order to create a see-through window 12 with excellent transparency in the banknote 10 and to ensure a high contrast for the security features 26, the film element 18 is connected to the banknote substrate 14 via a highly transparent and clearly formed adhesive layer 20 in the area of the through opening 16.

According to the exemplary embodiment shown in FIGS. 1 and 2, such an attractive visual appearance is achieved by providing the adhesive layer 20 on the film element 18 with a recess 22, which substantially encloses the region of the through opening 16, before the film application. The recess 22 is in shape However, the through opening 16 is introduced into the adhesive layer 20, but is designed smaller by 1 mm to 2 mm than the opening 16 in order to absorb tolerances in the application of the film element 18.

In this way, on the one hand, the film element 18 in the region of the opening 16 securely bonded to the banknote substrate 14, on the other hand, the essential part of the window surface 12 has excellent transparency and clarity, since of the adhesive layer 20, only a peripheral edge 24 of a width of 1 mm to 2 mm in the region of the opening 16 remains. Due to the high degree of transparency and clarity in the area of the opening, the visual and mechanical verification of the security feature 26 compared to known film elements without recess of the adhesive is substantially improved and thus the counterfeit protection of the value document is increased.

As a further advantage of the design according to the invention, improved handling of the banknotes is achieved. By the window area almost completely detecting recess 22, the adhesion of dirt on the window back is effectively suppressed. Also, the risk of build-up of adhesive on the counter-pressure rollers of a printing machine in the window area, as well as the risk of blocking of substrates or cut banknotes in packs is effectively countered.

In the embodiment of FIG. 3, the adhesive layer 20 has also been provided with a recess 32 in the form of the through-opening 16 that substantially encloses the region of the through opening 16 before the film application. In contrast to the design of FIG. 2, however, the recess 32 is not smaller, but larger than the opening 16 by 1 mm to 2 mm, so that, taking into account the register tolerances during application of the film element 18, the region of the opening 16 remains completely free of adhesive. Since the film element 18 is not bonded to the substrate 14 only in a narrow edge region 34 of the opening, a secure connection between the film element 18 and the banknote substrate 14 is nevertheless ensured.

The transition between the adhesive layer 20 and the recess 22 or 32 can according to the invention with a sharp boundary, as shown in Figures 2 and 3, or with a soft and continuous transition 40, as shown in the embodiment of FIG , The layer thickness of the adhesive layer 20 decreases continuously, for example in a 3 mm wide transition region 42, from the maximum layer thickness to a layer thickness of zero.

5 shows an exemplary embodiment in which the adhesive layer 20, as in the embodiment of FIG. 2, is recessed in the predominant part 52 of the window area, and in which additionally a pattern area 56 is provided in the region of the opening in which the adhesive layer 20 is applied in the form of patterns, characters or a coding.

As best seen in the plan view of the window portion of Fig. 5 (b), the adhesive layer 20 in the region of the opening 16 adjacent to the circumferential edge 54 already described in Fig. 2 forms a pattern of two concentric rings 56, due to the semitransparency of the adhesive layer 20 can be seen in phantom. The adhesive layer 20 can thus be used in the interior of the opening 16 in a targeted manner as a decorative design element, for displaying further information and / or as a further security feature. The surface portion of the pattern region 56 in the region of the opening 16 is kept so small that the disadvantages associated with a full-surface adhesive layer in the region of the opening do not occur during handling or are at least greatly reduced. Alternatively, the adhesive in pattern area 56 may be deactivated thermally or by UV irradiation.

With reference to FIG. 6, according to a further exemplary embodiment of the invention, a recess with layer thickness zero is not provided in the adhesive layer 20 in the area of the through opening 16, but a thin area 62 with an overlap of the film element 18 and substrate opposite the adhesion area 64 14 reduced layer thickness. The layer thickness can be reduced, for example, to less than half or even less than one third of the layer thickness of the adhesive layer in the adhesion region 64.

In the thin region 62, the film element thereby has a significantly increased transparency and reduced scatter compared to a full-surface adhesive layer of normal thickness. The transition from the maximum layer thickness in the adhesion region 64 to the reduced layer thickness in the thin region 62 can take place with a sharp boundary or, as in the representation of FIG. 6, with a soft, continuous transition 66.

With the embodiment of FIG. 7, a further approach for increasing the transparency and clarity of the adhesive layer is illustrated. FIG. 7 (a) initially shows a banknote with an applied film element 18 which is coated on one side with a full-surface adhesive layer 70. The roughness 72 of the adhesive layer is exaggerated for clarity. In order to improve the visual appearance in the window area, according to the invention, the adhesive layer 70 is smoothed after film application in the area of the through opening 16, as illustrated in FIG. 7 (b). The lower roughness 74 results in a lower light scattering and thus a lower mattness and higher transparency of the smoothed adhesive layer and the window area as a whole.

The smoothing of the adhesive layer 70 can take place in various ways. For example, the adhesive layer 70 can be thermally treated in the area of the continuous opening by laser application, so that the viscosity of the adhesive is reduced, the adhesive flows away and forms a smoother surface. Alternatively, the adhesive layer 70 in the window area can be subsequently calendered to obtain a smooth surface structure. Such a calendering step can take place, for example, with a teflon-coated tool in the application machine when the film element 18 is applied.

In the further exemplary embodiment of the invention illustrated in FIG. 8, the adhesive layer 70 itself is not smoothed, but the rough adhesive layer 70 is provided with a partial or full-surface lacquer layer 80 in the area of the through opening 16 and thereby the surface scattering of the combined layer structure of adhesive layer 70 and varnish layer 80 reduced.

Fig. 9 illustrates another approach of the invention based on the use of two different adhesives in the adhesive layer 90, each having different properties. For this purpose, the film element 18 before application in a viewing area 92, which comprises at least the region of the through opening 16, with a highly transparent adhesive 94, which has a lower adhesion or reduced resistance under shelters, but the transparency and clarity of the see-through window particularly little affected.

In contrast, in an adhesion region 96 outside the viewing region 92, an adhesive 98 is applied, which is selected predominantly from the point of view of a high adhesive force for securely joining the film element 18 and banknote substrate 14 and whose transparency and scattering properties are not significant. The two adhesives 94, 98 can therefore be chosen optimized for their respective task in order to obtain an adhesive layer 90, which combines high adhesive force with excellent transparency and clarity in the window area.

Analogously to the embodiments described above, the sighting area 92 for compensating for tolerances of tolerances advantageously has an approximately 1 mm to 2 mm greater extent than the opening to be closed, as illustrated in FIG. 9.

Another possibility for avoiding impairments of transparency and clarity in the window area is based on the use of an activatable adhesive with the aid of which the film element can be connected to the substrate via an adhesive layer which has been precisely matched with the through-opening.

With reference to FIG. 10, such an exact registration can be achieved, for example, by first printing on a banknote substrate 14 at least in the edge region of the intended opening a first adhesive layer 100 of an activatable adhesive, for example a hot melt adhesive, as shown in FIG. 10 (a) ). Then, the banknote substrate 14 becomes with the adhesive layer 100 not yet activated, provided with the desired opening 16, as shown in Fig. 10 (b). The remaining adhesive layer 100 is then matched exactly to the outline of the opening 16.

At the same time, as shown in Fig. 10 (c), a film member 18 is provided and provided with a second adhesive layer 102 and a recess 104 which is slightly larger, in the embodiment 2 mm larger than the banknote opening 16 is formed. Now, the film element 18 is applied to the substrate 14. During or after the film application, the activatable adhesive 100 is activated on the banknote substrate 14 so that the film element 18 is finally firmly bonded to the substrate 14, as shown in Fig. 10 (d). The activation can take place in the case of a hot-melt adhesive, for example by laser application, the necessary heating being generated by the radiation absorbed by the substrate or by the activatable adhesive itself.

In an alternative variant of the method, the activatable adhesive is only printed after the hole has been produced in the edge region of the opening. Here, too, an adhesive layer with a recess which is slightly larger than the banknote opening is applied to the film element and the activatable adhesive is activated during or after the film application.

In both variants, an exact registration of adhesive layer and opening is achieved by the combination of a passivated activatable adhesive layer 100 on the substrate 14 and an adhesive layer 102 recessed further than the opening on the film element 18. In both variants, in each case a complete strip-shaped region of activatable adhesive can also be applied to the substrate. It is essential, the film strip to be applied over it is wider than the adhesion area on the substrate. In its edge region of the film strip is provided with a second adhesive layer to ensure the adhesion of the film strip over its entire width.

In order to reduce the tack of the adhesive layer in the region of the through opening 16, the adhesive can be deactivated in all embodiments after the film application, for example by a thermal treatment or by UV irradiation.

In the embodiments with a recessed adhesive layer, the transparency and clarity of the window region is substantially independent of the transparency of the adhesive, so that in these cases, colored adhesive layers can be used. In particular, colored adhesives can be advantageous in embodiments in which the adhesive layer, as shown in FIG. 5, is additionally visible in the form of patterns, characters or a code in the interior of the window area. It also lends itself to the use of adhesives that are colored exclusively or additionally outside the visible spectral range and, for example, have IR-absorbing or UV-absorbing properties that can be evaluated as part of a mechanical authenticity test.

As already explained in more detail above, the adhesive cutout in all exemplary embodiments can be carried out prior to film application by applying a partial hydrophobic precoating to the film element or by partial removal of the adhesive layer by means of a washing process. After the film application, the adhesive layer can be removed in the region of the through opening, for example by means of laser ablation. Direct printing of a structured adhesive layer on the film element, for example by a gravure, flexo, screen, offset or transfer printing process, is also possible.

Suitable adhesives for the invention are, in particular, hot melt adhesives (hotmelts), UV or electron beam-curing adhesives, solvent- or water-based systems, hybrid systems and 1-component adhesives or 2-component adhesives.

Claims

Patent claims

1. Security paper for the production of security or value documents with an at least partially transparent film element, which is freely accessible at least in some areas on at least one side of the security paper through the security paper, characterized in that the film element over a free in the area accessible areas highly transparent and clear adhesive layer is connected to the security paper.

2. Security paper according to claim 1, characterized in that the adhesive layer for at least one of the freely accessible partial regions has a substantially the region of the partial area comprehensive recess.

3. Security paper according to claim 2, characterized in that the adhesive layer has a recess in the form of the freely accessible portion which is 1 mm to 2 mm smaller or 1 mm to 2 mm larger than the portion is formed.

4. Security paper according to claim 2 or 3, characterized in that the adhesive layer in the region of at least one of the freely accessible partial regions in addition to the recess has a pattern region in which the adhesive layer is applied in the form of patterns, characters or a coding.

5. Security paper according to claim 4, characterized in that a colored adhesive layer is used with a visible in the visible, infrared and / or ultraviolet color.

6. Security paper according to claim 1, characterized in that the adhesive layer in the region of at least one of the freely accessible partial regions has a thin region with a reduced layer thickness _/ in particular a layer thickness which is less than half the layer thickness outside the thin region.

7. Security paper according to at least one of claims 2 to 6, characterized in that the adhesive layer and the recess or the thin region merge into one another along a sharp boundary.

8. Security paper according to at least one of claims 2 to 6, characterized in that the adhesive layer and the recess or the thin region have a soft, continuous transition.

9. Security paper according to claim 1, characterized in that the adhesive layer of an adhesive with a low refractive index, in particular with a refractive index less than 1.4, is formed.

10. Security paper according to claim 1, characterized in that the adhesive of the adhesive layer is deactivated in the region of at least one of the freely accessible subregions.

11. Security paper according to claim 1, characterized in that the adhesive of the adhesive layer in the region of at least one of the freely accessible smoothed subregions, in particular by the action of heat or calendering.

12. Security paper according to claim 1, characterized in that the adhesive of the adhesive layer is provided in the region of at least one of the freely accessible partial regions with a lacquer layer.

13. Security paper according to claim 1, characterized in that the adhesive layer is formed in a viewing area, which comprises at least one of the freely accessible partial areas, by a highly transparent adhesive and is formed in an adhesive area outside the field of view by an adhesive of high adhesion.

14. A security paper according to claim 1, characterized in that the film element is connected via a precisely with at least one of the freely accessible subregions zugepasserte adhesive layer with the security paper.

15. A security paper according to claim 14, characterized in that the adhesive layer is multi-layered and has a first applied directly on the security paper adhesive layer of an activated adhesive, in particular an activated hot melt adhesive, and a second applied to the film element adhesive layer having at least one of having freely accessible partial areas enclosing recess.

16. Security paper according to at least one of claims 1 to 15, characterized in that the security paper has a through opening, which is closed by the film element, wherein the film element via a high throughput in the region of the through opening. rented and clear trained adhesive layer is connected to the security paper.

17. Security paper according to claim 16, characterized in that the through opening is produced in the papermaking and in

Edge region has characteristic irregularities.

18. Security paper according to claim 16, characterized in that the continuous opening after the papermaking, in particular by punching or cutting, particularly preferably by laser beam cutting, is generated.

19. The security paper according to claim 16, wherein the film element is a patch applied to the security paper or an applied wide film strip.

20. Security paper according to at least one of claims 1 to 15, characterized in that the film element is at least partially embedded in the security paper and freely accessible in window areas on one or both sides of the security paper, wherein the film element highly transparent in the area of the window areas and a clear adhesive layer is bonded to the security paper.

21. Security paper according to claim 20, characterized in that the film element is a narrow security strip or a wide security band.

22. Security paper according to claim 20 or 21, characterized in that the film element is a window security element, which is attached to stiminten window areas on one side of the security paper emerges and is freely accessible there.

23. Security paper according to claim 20 or 21, characterized marked, that the film element is a pendulum security element, which emerges alternately at certain window areas on opposite sides of the security paper and is freely accessible there.

24. Security paper according to at least one of claims 20 to 23, characterized in that the security paper is formed in one layer and the film element is at least partially embedded in the one paper layer.

25. Security paper according to at least one of claims 20 to 23, characterized in that the security paper is formed in two or more layers and the film element is at least partially embedded in one of the paper layers.

26. Security paper according to at least one of claims 20 to 23, characterized in that the security paper is formed in two or more layers and the film element is at least partially embedded between two of the paper layers.

27. Security paper according to at least one of claims 1 to 26, character- ized in that the film element has at least one security feature.

28. Security paper according to at least one of claims 1 to 27, characterized in that the security feature is arranged in one of the freely accessible subregions.

29. Security paper according to claim 27 or 28, characterized in that the security feature of a diffractive structure, such as a hologram or a hologram-like diffraction structure, a matte structure, a metallization, a perforation, a lens or micromirror structure, a micro-optical system, in particular a micro-optical moiré magnification arrangement, a thin-film element, a polarizing filter or a print comprising at least one substance with optically variable, luminescent, electrically conductive or magnetic properties.

30. document of value, such as banknote, identity card and the like, with a security paper according to at least one of claims 1 to 29.

31. Film element for a security paper or a value document according to one of claims 1 to 30, which is at least partially transparent and which is provided in the region of the freely accessible portions with a highly transparent and clearly formed adhesive layer.

32. A method for producing a security paper or value document according to one of claims 1 to 30, in which a continuous opening is introduced into the security paper or document of value, an at least partially transparent film element is provided and provided with an adhesive layer which extends in the region of the continuous one Opening is highly transparent and clear, and in which the through opening is closed with the film element.

33. A method for producing a security paper or value document according to one of claims 1 to 30, wherein an at least partially transparent film element is provided, the film element is at least partially embedded in a security paper or document of value, so that in window areas on one or both sides of the security paper is freely accessible through the security paper, and in which the film element is provided with an adhesive layer which is highly transparent and clear in the region of the window areas.

34. The method according to claim 32 or 33, characterized in that the adhesive layer is provided with a substantially the region of the continuous opening or at least one of the window portions comprising recess.

35. The method according to claim 34, characterized in that the recess is produced in the form of the through opening or at least one of the window areas, and 1 mm to 2 mm smaller or 1 mm to 2 mm larger than the continuous opening or the window area formed becomes.

36. The method according to claim 34 or 35, characterized in that the film element is provided before the application of the adhesive layer with a hydrophobic coating in the form of the desired recess.

37. The method of claim 34 or 35, characterized in that on the film element prior to application of the adhesive layer, a soluble wash ink is printed in the form of the desired recess, and that the wash ink is washed off after applying the adhesive layer together with this by a solvent.

38. The method according to claim 34 or 35, characterized in that the adhesive layer in the area of the through opening or a window area after application or embedding of the film element on or in the security paper or document of value is removed, preferably by means of laser ablation.

39. The method of claim 34 or 35, characterized in that the adhesive layer is applied structured, with the desired recess on the security paper or document of value, in particular printed.

40. The method according to claim 34, characterized in that the adhesive layer is applied in the region of the continuous opening or of a window area in a pattern area in the form of patterns, characters or an encoding.

41. The method according to claim 32 or 33, characterized in that the adhesive layer is applied in the region of the continuous opening or of a window region as a thin region with a reduced layer thickness.

42. The method according to at least one of claims 32 to 41, characterized in that the adhesive layer is applied with a soft, continuous transition between the adhesive layer and recess or thin area.

43. The method according to at least one of claims 32 to 41, characterized in that the adhesive layer is applied with a sharp boundary between the adhesive layer and recess or thin area.

44. Method according to claim 32, characterized in that the adhesive of the adhesive layer is deactivated in the area of the through opening or of a window area, in particular by thermal treatment or UV irradiation.

45. The method of claim 32 or 33, characterized in that the adhesive of the adhesive layer in the region of the continuous opening or a window area is smoothed.

46. The method according to claim 45, characterized in that the

Adhesive for smoothing is thermally treated, in particular by exposure to laser radiation.

47. The method according to claim 45, characterized in that the adhesive is calendered for smoothing after the application or introduction of the film element.

48. The method of claim 32 or 33, characterized in that the adhesive layer is provided partially or completely with a lacquer layer.

49. The method according to claim 32 or 33, characterized in that in a viewing area which comprises at least the continuous opening or a window area, a highly transparent adhesive is applied to the film element and in an adhesion area outside the field of view, an adhesive of high adhesion the film element is applied.

50. The method according to claim 32 or 33, characterized in that a first adhesive layer of an activatable adhesive, in particular a A hot melt adhesive is applied to the security paper or document of value, and a second adhesive layer is applied with a continuous opening or a window area enclosing recess on the film element, and that the activatable adhesive is activated after the application or insertion of the film element.

51. The method according to claim 50, characterized in that the continuous opening or a window region is produced after the application of the activatable adhesive layer.

52. The method according to claim 50, characterized in that the activatable adhesive layer is applied after the production of the continuous opening or a window area.