EP3274183A1

EP3274183A1 - Multilayer element and method for producing same

Info

Publication number: EP3274183A1
Application number: EP16711791.0A
Authority: EP
Inventors: Ludwig Brehm; Klaus PFORTE; Patrick KRÄMER; Karin FÖRSTER
Original assignee: Leonhard Kurz Stiftung and Co KG
Current assignee: Leonhard Kurz Stiftung and Co KG
Priority date: 2015-03-24
Filing date: 2016-03-09
Publication date: 2018-01-31
Anticipated expiration: 2036-03-09
Also published as: US11124008B2; US20180043723A1; JP6726204B2; JP2018512305A; EP3274183B1; DE102015104416A1; CN107635785B; WO2016150704A1; CN107635785A

Abstract

The invention relates to a method for producing a multilayer element, comprising the steps of: a) providing a first printed layer; b) partially applying a second printed layer onto the first printed layer; c) structuring the first printed layer using the second printed layer as a mask. The invention further relates to a multilayer element obtainable by said method as well as to a security document comprising a multilayer element of said type.

Description

Multilayer body and method for its production

The invention relates to a method for producing a multilayer body, a multi-layer body obtainable in this way and a security document having such a multilayer body.

In designing security elements for banknotes, identification papers and similar security documents, it is desirable to print fine line patterns such as guilloche patterns. A particularly good visual impression arises when such line patterns are printed in multiple colors, for example with color gradients or color gradients.

A known method for this is the iris printing, in which different colors are applied side by side on a common inking roller of a printing press. When printing these mix

Colors, so that the desired color gradient arises. The exact course of the Gradients, however, can hardly be controlled, so that a reproducible production of identical print motifs is hardly possible.

A very fine structuring of a multi-color image with each other exactly in the register standing parts of the motif is generally hardly possible with conventional printing, because the register accuracy and edge sharpness are not sufficient. In particular, multicolored fine lines are so hard to produce. In addition, fine screened motifs on a gravure roll dry very quickly due to the very small amount of ink required and are therefore very difficult to print.

Register accuracy is a positional accuracy of two or more elements and / or layers to understand each other. It should be the

Register accuracy to move within a predetermined tolerance while being as low as possible. At the same time, register accuracy of multiple elements and / or layers relative to one another is an important feature in order to increase counterfeit security. The positionally accurate positioning can in particular by means of optically detectable registration marks or

Register marks take place. These register marks or register marks can either represent special separate elements or regions or layers or themselves be part of the elements or regions or layers to be positioned. From a "perfect register" one speaks, if the

Register tolerance is close to zero or practically zero. The object of the present invention is to provide an improved method for producing a multilayer body with fine line patterns, such a multilayer body and a security document having such a multilayer body

To provide multilayer body. This object is solved by the subject matter of claims 1, 26 and 36.

Such a method for producing a multilayer body comprises the steps of: a) providing a first printing layer;

b) partially applying a second print layer to the first

Print layer;

c) patterning the first print layer using the second

Print layer as a mask.

This gives a multilayer body having a first printed layer and a second one arranged on a surface of the first printed layer

Printing layer, wherein the first printing layer is patterned using the second printing layer as a mask.

Such a multilayer body can be found in a security document, in particular a banknote, a security, an identification document, a visa document, a passport or a credit card

Find application to increase its security against counterfeiting.

In this case, the first printing layer can be applied in particular flat. It is thus possible without the initially described problems when printing multicolored fine lines a multicolored motif, for example with

Color transitions, color gradients or even a true color image to produce. The second print layer merely serves as a mask, ie as a protective layer for the structuring of the first print layer. Therefore, the second printing layer can be applied monochrome. In this way, fine line patterns can be generated in the second printing layer, without the initially described problems when printing multicolored fine lines occur.

In the subsequent structuring of the first print layer under

Using the second print layer as a mask removes the areas of the first print layer that are not covered by the second print layer. The second print layer thus covers all areas of the first

Pressure layer, but can also extend beyond this. This gives a finely structured first printing layer which has the fine line pattern of the second printing layer and the coloring produced when the first printing layer is applied. In particular, as sharp and accurate register fine, multi-colored line structures can be produced in a reproducible manner.

It is advantageous if, for providing the first printing layer, a first lacquer is used, which with a second lacquer used for applying the second printed layer, a chemical reaction,

especially enters into a crosslinking reaction. In this way, the first lacquer, where the second printing layer is applied, can be changed by reaction with the second lacquer in particular to become resistant to chemical substances used for structuring the first printing layer, such as, for example, etching or solvent.

The first lacquer is preferably an aqueous-based or solvent-based lacquer soluble in alkali. For example, the paint of polyacrylic acid consist. Such a varnish can be removed from its substrate by treatment with an alkaline etchant. This allows the desired structuring of the first print layer using the second print layer as a mask.

It is further preferred if the first lacquer colorants, in particular colorful or achromatic pigments and / or effect pigments, UV-excitable

Fluorescent pigments (UV = ultraviolet (radiation / light)),

Thin film pigments, cholesteric liquid crystal pigments, dyes and / or metallic or non-metallic nanoparticles. In this way, the desired color effects in the visible light and / or when excited by UV light can be generated. In particular, it is expedient for the first lacquer to comprise a plurality of such colorants which form color gradients, gradients, true color images or the like.

Furthermore, it is preferred if the second paint is a PVC copolymer of vinyl chloride, vinyl acetate and dicarboxylic acid. Such a lacquer is resistant to alkaline etchants and can therefore serve as a protective lacquer or mask for structuring the first print layer with such an etchant.

Alternatively, the second varnish may also be a polyester varnish with cellulose propionate. Such a lacquer also has the desired alkali resistance and can therefore be used as a protective lacquer.

It is also advantageous if the second varnish is a cross-linker,

in particular polyisocyanate and / or polyaziridine. With such

Crosslinkers can carboxylic acid or hydroxyl groups of the two paints be cross-linked, so that the first and second print layer form a stable chemical compound. The cross linking makes the two

Print layers where the second print layer is applied to the first stable to alkaline etchants and thus enables the structuring of the first print layer.

It is preferred if the first printing layer by the action of an alkaline etchant, in particular of alkali metal hydroxide (NaOH) or

Alkali carbonate (Na ₂ COs) is structured. By such etchant, the first paint in those areas where it is not through the second

Printed layer is protected, dissolved and removed, so that the desired structuring results.

It is advantageous if the alkaline etchant is used in a concentration of 0.5% to 3%, and / or at a temperature of 20 ° C to 50 ° C, and / or for a period of 0.5s to 5s , This allows a complete and sharp removal of the first print layer in the

Areas in which it is not covered by the second printing layer, be ensured.

In addition, the etching process may be promoted by agitating the etchant, targeting the first print layer with the etchant, sonicating, brushing, and / or wiping. The first printing layer is preferably applied in multiple colors, in particular in the form of a color gradient, color gradients or as a true color image. After the structuring of the first printing layer, the desired motif then remains in the form of multicolored fine lines congruent to the second printing layer. Preferably, the first printing layer in the form of a grid, in particular a line grid with 60 lines / cm to 120 lines / cm and / or a

Line depth of 15 μιτι applied to 45 μιτι. The line depth refers to the depth of the introduced on a pressure roller, in particular on a gravure roll structures for receiving the ink.

Alternatively, the first printing layer in the form of a grid, in particular a cross-diagonal grid with a screen width of 40 cells / cm to 100 cells / cm and / or a depth of 15 μιτι to 45 μιτι be applied. In this case, the first and / or second printing layer can be applied by gravure printing. By gravure in particular, the above-mentioned grid can be realized.

Alternatively, the first and / or second print layer can be applied by screen printing, in particular with a screen thickness of 90T to 140T or 90S to 140S.

Both gravure printing and screen printing can be realized with a minimum spot size of 75 μιτι and a minimum point spacing of 10 μιτι grid. When printing in full tone, so in particular

Printing the second printing layer, a minimum line thickness of 80 μιτι at a minimum line spacing of 100 μιτι can be achieved. In all cases is the achievable register tolerance both within a grid and between the first and second printing layer in about 200 μηη.

It is further preferred if the second printing layer in the form of a

graphic motif, alphanumeric character, logo, image, pattern, in particular guilloche pattern. As already explained, the second print layer defines the final shape of the printed motif, while the first print layer defines only the color. It is further preferred if the first printing layer is applied to a layer composite comprising one or more of the following layers: a carrier layer, a replication layer having a surface relief, a

Reflection layer, a protective layer, a volume hologram layer. Alternatively, a layer composite comprising one or more of the following layers can also be applied to the first and / or second printing layer: a carrier layer, a replication layer with a

Surface relief, a reflection layer, a protective layer, a

Volume hologram layer.

Both options can also be combined. In this way, further security and design features can be integrated into the multi-layer body in order to increase its counterfeiting and manipulation security and to realize optically appealing designs.

It is expedient if, prior to the application of the layer composite, a height compensation layer, in particular of a lacquer of a combination of butyl acrylate and PMMA with a layer thickness of 0.5 μm to 3 μm on the first and / or second printing layer is applied. This is particularly useful if further layers of the layer composite are applied to the first and / or second printing layer. The mechanically relatively flexible height compensation layer leveled thereby gradations, which are formed in the patterning of the first printing layer, thus providing a smooth surface ready, to which the other layers can be applied clean.

It is also advantageous if at least one layer of the layer composite is patterned using the second printing layer as a mask.

As a result, a further motif can be formed in register with the second printing layer. This makes it possible, for example, that the motif formed by the second printing layer can be viewed from different sides of the page

Multilayer body has a different appearance.

It is particularly expedient if the patterned using the second printing layer as a mask at least one layer of

Layer composite is a metal layer. This is particularly useful when the first print layer contains UV-fluorescent colorants. A register layer formed to the printed layers metal layer amplifies the optical

Effect of the print layers under UV irradiation, since the metal layer on the one hand looks black even under UV light and on the other hand, a part of the incident UV light back reflects back into the print layers. It is advantageous if, for structuring the metal layer, a

Photoresist layer is applied to the metal layer, exposed from the side of the second printing layer ago and when developing in the exposed

Areas is removed. You get a perfect match to the print layers Registered photoresist layer, based on which then the

Metal layer can be structured. The use of an external mask is not necessary. It is preferred that after developing the photoresist

Metal layer is patterned by etching. Thus, the metal layer itself is structured in the perfect register to the printed layers.

It is further advantageous if the first and / or second printing layer comprises a UV blocker which absorbs UV light in a wavelength range in which the photoresist layer is exposed. This improves the effect of the print layers as a mask for the exposure of the photoresist layer. The UV blocker may also be UV fluorescent pigments provided for the optical effect of the printing layer.

Furthermore, it is expedient if the layer composite at least one

Coating layer comprising a UV blocker. This is particularly advantageous when the first printing layer contains UV-fluorescent colorants. Where the lacquer layer with the UV blocker is present, no UV light reaches the first printed layer, so that a non-fluorescent motif recognizable under UV light can be formed in this way.

Preferably, the lacquer layer with the UV blocker in the form of a graphic motif, alphanumeric character, logo, image, pattern, in particular Guillochen pattern, applied. Such a motif may, for example, supplement or superimpose a motif formed by the first and second printing layers. As already explained above, it is advantageous if the first and second printing layers are chemically crosslinked with each other. This gives the first print layer the necessary chemical stability, the

Structuring, for example by etching, allows.

Further, it is advantageous if the first and / or second printing layer has a layer thickness of 1 μm to 3 μm.

The multilayer body preferably comprises a replication layer with a surface relief. In particular, it is preferred if the surface relief introduced into the replication layer is an optically variable element, in particular a hologram, Kinegram® or Trustseal®, a preferably linear or crossed sinusoidal diffraction grating, a linear or crossed single or multi-level rectangular lattice

Zero-order diffraction structure, an asymmetric relief structure, a blazed grating, a preferably isotropic or anisotropic matt structure, or a diffractive and / or refractive and / or light-focusing micro or nanostructure, a binary or continuous Fresnel lens, a binary or continuous Fresnel freeform surface , one

Microprism structure or a combination structure formed therefrom.

As a result, a variety of attractive and difficult-to-copy optically variable effects can be realized. It is also expedient if the multi-layer body comprises a wax layer and / or a release layer. A wax layer, especially if it is partially applied, can provide additional protection against tampering. For example, a forger tries to solve the layer composite, so allows the wax layer to partially detach the adjacent layers from each other. Where the wax layer is not present, the layers adhere to each other, so that in such an attempt, the layer composite is destroyed. A wax layer can also serve as a release layer, which enables a detachment of a part of the layer composite from a carrier layer. Alternatively, the release layer can also consist of a strongly filming acrylate and / or also be part of the protective lacquer layer.

Preferably, a layer thickness of the replication layer and / or the release layer 1 is μιτι to 5 μιτι, preferably 1 μιτι to 3 μιτι.

It is also expedient if the multi-layer body has a removable carrier layer, in particular of PET (polyethylene terephthalate), PEN

(Polyethylene naphthalate) or BOPP (biaxially oriented polypropylene = biaxially stretched polypropylene), with a layer thickness of 6 μιτι to 50 μιτι, preferably from 12 μιτι to 50 μιτι comprises.

Such a carrier layer protects and stabilizes the multilayer body during its production and further processing and can be removed during the attachment of the multilayer body on a security document.

Preferably, the multi-layer body comprises at least partial

Metal layer, in particular of aluminum, copper, chromium, silver and / or gold or of alloys of the aforesaid metals, having a

Layer thickness of 5 nm to 100 nm, preferably from 10 nm to 50 nm. Such a metal layer may on the one hand form a visually appealing motif, but on the other hand serve as a reflection layer to enhance the visual impression of an optically variable element. The Reflection layer is applied in particular directly to the surface relief of the replication, in particular vapor-deposited. Alternatively or additionally, the reflection layer can also be designed as HRI layer (HRI = high refractive index), in particular made of ZnS, ΤΊΟ2 or ZrO2.

Furthermore, it is preferred if the multi-layer body comprises a particularly transparent protective lacquer layer, in particular of PVC, polyester, acrylate, nitrocellulose, cellulose acetobutyrate or mixtures thereof, with a layer thickness of 0.5 μm to 10 μm, preferably from 2 μm to 5 μm. A protective lacquer layer preferably forms an outer surface of the

Multi-layer body and protects it from environmental influences, scratching and the like.

The invention will now be explained in more detail with reference to exemplary embodiments. Show it:

Fig. 1 A first intermediate in the production of a

Embodiment of a multi-layer body in a schematic sectional view;

Fig. 2 shows a second intermediate in the production of a

Embodiment of a multi-layer body in a schematic sectional view;

Fig. 3 shows an embodiment of a multilayer body in

schematic sectional view;

Fig. 4 is a schematic plan view of a first printing layer of a

Embodiment of a multilayer body before

Structuring; Fig. 5 is a schematic plan view of a first and second

Print layer of an embodiment of a

Multilayer body before structuring;

Fig. 6 is a schematic plan view of a first and second

Print layer of an embodiment of a

Multilayer body after structuring;

7 shows a schematic plan view of a first printing layer of a further exemplary embodiment of a multilayer body before structuring; Fig. 8 is a schematic plan view of a first and second

Print layer of another embodiment of a

Multilayer body before structuring;

Fig. 9 is a schematic plan view of a first and second

Print layer of another embodiment of a

Multilayer body after structuring;

In the production of a multilayer body 1 shown overall in FIG. 3, firstly a layer composite 11 is provided, which comprises a carrier layer 11, a release layer 11, a protective layer 11, a replication layer 11, a reflection layer 11 and a further protective layer 1 16 includes.

The carrier layer 1 1 1 is removable from the layer composite 1 1 and consists in particular of PET (polyethylene terephthalate) with a layer thickness of 6 μιτι to 50 μιτι, preferably from 12 μιτι to 50 μιτι.

The carrier layer 1 1 1 protects and stabilizes the multilayer body 1 in its manufacture and further processing and can in the attachment of the

Multi-layer body 1 are removed on a security document. The release layer 1 12 allows a detachment of the carrier layer 1 1 1 from the rest of the layer composite 1 1 and consists for example of a wax with a layer thickness of 50 nm to 500 nm, preferably 70 nm to 150 nm

Removal layer may alternatively consist of a strong filming acrylate and / or also be part of the protective lacquer layer with a layer thickness of 1 μιτι to 5 μιτι, preferably 1 μιτι to 3 μιτι.

The protective layers 1 13 and 1 16 form protective surfaces of the

Layer composite 1 1 and are preferably made of a clear paint, such as a UV-curing paint, PVC, polyester or acrylate, with a layer thickness of 0.5 μιτι to 10 μιτι, preferably 1 μιτι to 5 μιτι. The replication layer 14 preferably consists of an acrylate with a

Layer thickness of 1 μιτι to 5 μιτι, preferably from 1 μιτι to 3 μιτι.

In a surface of the replication layer 1 14, a surface relief is formed, which forms an optically variable effect. In particular, it is preferably a hologram, Kinegram® or Trustseal®, a preferably linear or crossed sinusoidal diffraction grating, a linear or crossed single or multi-level rectangular lattice, a

Zero-order diffraction structure, an asymmetric relief structure, a blaze grating, a preferably isotropic or anisotropic, matt structure, or a light-diffractive and / or refractive and / or light-focusing

Micro or nanostructure, a binary or continuous Fresnel lens, a binary or continuous Fresnel freeform surface, a microprism structure or a combination structure thereof. The metal layer 15 is at least partially on the surface of

Applied replicating and consists in particular of aluminum, copper, chromium, silver and / or gold or alloys of the aforementioned metals with a layer thickness of 5 nm to 100 nm, preferably from 10 nm to 50 nm.

As shown in FIG. 1, a first printing layer 12 is subsequently printed on a surface of the protective layer 1 16.

For printing the first printing layer 12, it is preferable to use an alkali-soluble aqueous-based or solvent-based paint. For example, the paint may consist of polyacrylic acid. Such a varnish can be removed from its substrate by treatment with an alkaline etchant. This allows a later structuring of the first printed layer 12.

It is further preferred if the lacquer of the first printing layer 12 colorants, especially colorful or achromatic pigments and / or effect pigments, UV excitable fluorescent pigments, thin film pigments, cholesteric liquid crystal pigments, dyes and / or metallic or

comprises non-metallic nanoparticles.

A color pigment having a proportion of between 5% and 35%, in particular between 10% and 25%, in the lacquer used for printing the first printing layer 12 is, for example, a UV-luminescent pigment having one or more excitation wavelengths, for example 254 nm and / or 365 nm Such a pigment is eg Lumilux Blue CD 710 (blue at 365 nm and blue at 254 nm) or BF1 (from Honeywell Specialty Chemicals or Microalarm, Hungary) (at 365 nm green fluorescent, at 254 nm red / orange fluorescent). For the visible spectral range, it is possible to use all known organic color pigments or dyes. The first printing layer 12 is preferably applied in multiple colors, in particular in the form of a color gradient, color gradients or as a true color image.

Since the first print layer 12 is applied flat, so can

high-resolution and sharp color gradients, gradients or true color images are generated.

Preferably, the first printing layer 12 is gravure applied in the form of a grid, in particular a line grid with 60 lines / cm to 120 lines / cm and / or a line depth of 15 μιτι to 45 μιτι.

Alternatively, the first printing layer 12 in the form of a grid, in particular a cross-diagonal grid with a screen width of 40 cells / cm to 100 cells / cm and / or a depth of 15 μιτι to 45 μιτι be applied. Alternatively, the first print layer 12 can be applied by screen printing, in particular with a screen thickness of 90T to 140T or 90S to 140S.

Both gravure printing and screen printing can be realized with a minimum spot size of 75 μιτι and a minimum point spacing of 10 μιτι grid. The first printing layer 12 thus provides the desired in the final multi-layer body 1 color of the resulting motif, but does not yet on the final contour of this motif. Two examples of the design of the first printing layer 12 are shown in FIGS. 4 and 7.

In the embodiment of FIG. 4, the printing layer 12 has a

Color gradients extending diagonally across the printed area.

In the exemplary embodiment according to FIG. 7, the first printed layer 12 comprises a first partial region 121 and a second partial region 122. In both

Subareas 121, 122 includes the paint used in the visible

Spectral range visible pigment and / or a dye, as well as fluorescent under ultraviolet light colorants. This will be an im

Ultraviolet light (UV light) recognizable motif created, which is visible even in visible light.

However, the pigments and / or dyes visible in the visible spectral range should preferably be admixed only with a small proportion so as not to unduly weaken the luminescence of the UV-luminescent pigments and / or dyes in UV light. Visible in the visible spectral range pigments and / or dyes are usually black in the UV light, i. absorb the UV light and thereby weaken the UV luminescence of adjacent in the paint UV luminescent pigments and / or dyes.

In this case, in each case one UV color can be converted into a different visible pigment and / or dye in the first partial region 121 and in the second partial region 122 be mixed, so that the multicolor of the subject under UV light also in accordance, but different colors also visible under visible light. But it is also possible to mix in all UV inks the same visible pigments and / or dyes, so that there is a single-color motif in visible light, which only appears multicolored in UV light.

After application of the first printing layer 12, a second printing layer 13 is applied to the first printing layer 12. This is shown in Fig. 2 in

Sectional view and shown in Figures 5 and 8 in plan view.

In contrast to the first printing layer 12, the second printing layer 13 is monochrome, ie in full tone, printed. As a result, fine line structures, such as Guilloche pattern, can be realized. In FIGS. 5 and 8, the print layer 13 is drawn opaque black for illustrative purposes only. However, the printing layer 13 can also be transparent, translucent or transparent or translucent. Again, the pressure can be done in gravure or screen printing. When printing the second printing layer 13, a minimum line thickness of 80 μm can be achieved with a minimum line spacing of 100 μm.

The paint used for printing the second printing layer 13 is

For example, a solvent-based varnish of a PVC copolymer of vinyl chloride, vinyl acetate, dicarboxylic acid and a crosslinker, e.g.

Polyisocyanate or polyaziridine. Alternatively, lacquer of polyester and cellulose propionate and a crosslinker can be used Paint applied to the above-described, used to print the first printing layer 12 acrylic paint, this crosslinker reacts with the

Acrylic acid in this paint, making it alkali-resistant and thus resistant to a subsequent etching step.

After printing the second printing layer 13, a treatment is carried out with a preferably alkaline etchant, for example with alkali metal hydroxide (NaOH) or alkali metal carbonate (Na ₂ CO ₃ ). It is advantageous if the alkaline etchant is used in a concentration of 0.5% to 3%, and / or at a temperature of 20 ° C to 50 ° C, and / or for a period of 0.5s to 5s ,

In addition, the etching process may be promoted by agitating the etchant, targeting the first print layer with the etchant, sonicating, brushing, and / or wiping.

By this treatment, the first printing layer 12 is completely and sharply removed in the areas where it is not covered by the second printing layer 13, removed. Thus, one obtains the multilayer body 1 shown in section in FIG. 3 and in plan view in FIGS. 6 and 9 in plan view.

Thus, the first print layer 12 provides the final coloration of the printed motif, while the contour of the motif is defined by the second print layer 13 and the etching step. This can be high-resolution and

crisp multicolored line patterns are generated. It is also possible to reverse the order of the manufacturing steps and to first form and pattern the print layers 12 and 13. The layer composite 11 is then subsequently applied to the printed layers 12, 13.

It should be noted, however, that a height compensation layer should be provided before the application of the layer composite 11, so that existing height differences in the partial printed layers 12, 13 do not impede subsequent process steps, in particular replication.

In this case, it is then also possible to use the motif thus created from the printing layers 12, 13 as a mask for a further exposure step. The only prerequisite for this is that the motif for the radiation to be exposed is partially impermeable by the use of pigments, dyes and / or transparent blockers, in particular UV blockers. In particular, UV-luminescent pigments and dyes, which may already be provided in the printing layers 12, 13, absorb the UV radiation and thus advantageously already act as UV blockers in a subsequent exposure

Thus it would be possible, for example, after structuring the

Print layers 12, 13 to apply a replication layer 1 14 and a

Form surface relief. Subsequently, a metal layer 15 can be applied, for example by vapor deposition, sputtering,

Vapor deposition or the like. A photoresist is then applied to this metal layer 15 and exposed through the motif and the metal layer 15 from the side of the motif formed by the printed layers 12 and 13. In the subsequent development of the photoresist are not

cross-linked / exposed portions of the photoresist. This now covers the metal layer 1 15 congruent and in register with the print layers 12 and 13. In a further etching step, the metal layer can now be demetallized partially, so that the metal is also congruent to the print layers 12, 13.

This results in a partial metal layer 1 15, which is formed in the perfect register to the motif formed by the print layers 12, 13. The metal layer 15 can thereby contribute to the optical effect of this motif

Increase irradiation with UV light, since the metal layer 1 15 appears black even in UV light and thus increases the optical contrast and at the same time reflects back portions of the UV light in the print layers 12, 13 The optical effect of the multi-layer body 1 can also be significantly modified by combining the print layers 12, 13 with layers that are transparent in the visible range but block specific spectral regions in the UV region. This is particularly useful if the print layer 12 contains UV-fluorescent colorants.

For example, blocks a PET film, the spectral range below a wavelength of 310 nm. Thus, the optical effect, for example, upon excitation of the colorant in the print layer 12 with a wavelength of 365 nm of look the front and with a light wavelength of 254 nm from the back of the multi-layer body 1 look different.

Likewise, however, it is also possible to print corresponding transparent lacquers with UV blockers in another motif in such a way that the optical effect of the printing layer 12 only appears in regions and depending on the UV wavelength.

The second printing layer 13 can optionally also have such a UV blocker. This may be, for example, benzophenone 6.

The second printing layer 13 can also be used with pigments and / or

Colored dyes that are visible in the visible spectral range. One example is to print the first print layer 12 with a translucent optically variable pigment such as, for example, Iriodin® from Merck or Lumina® from BASF.

Subsequently, the second printing layer 13 is only partially overlapping printed with the first printing layer 12 and the iriodin removed where the second printing layer 13 is not present.

The result is a motif in the color of the second print layer 13, which is partially covered with the iriodin of the first print layer 12. The iriodin and the second printing layer 13 are arranged in the perfect register.

The result is a metameric color effect in which, depending on the viewing angle, the areas without iriodin look almost identical or under a different one Perspective angles differ due to the transparency and simultaneous optical variability of iriodin.

LIST OF REFERENCE NUMBERS

1 multilayer body

11 layer composite

111 carrier layer

112 release layer

113 protective layer

114 replication layer

115 metal layer

116 protective layer

12 first printing layer

121 first area

122 second area

13 second print layer

Claims

claims

A method of manufacturing a multilayer body, comprising the steps of: a) providing a first printing layer;

b) partially applying a second print layer to the first print layer;

c) patterning the first print layer using the second print layer as a mask.

Method according to claim 1,

characterized,

in that for the provision of the first printing layer a first lacquer is used, which with one for applying the second

Printing layer used second paint a chemical reaction, in particular enters into a crosslinking reaction.

3. The method according to claim 2,

characterized, that the first lacquer is an aqueous-based or solvent-based alkali-soluble lacquer.

Method according to claim 2 or 3,

characterized,

that the first lacquer colorants, especially colorful or achromatic pigments and / or effect pigments, UV-excitable

Fluorescent pigments, thin film systems, cholesteric

Liquid crystals, dyes and / or metallic or non-metallic nanoparticles comprises.

Method according to one of claims 2 to 4,

characterized,

that the second paint is a PVC copolymer of vinyl chloride, vinyl acetate and dicarboxylic acid.

Method according to one of claims 2 to 4,

characterized,

the second varnish is a polyester varnish with cellulose propionate.

Method according to one of claims 2 to 6,

characterized,

in that the second lacquer comprises a cross-linker, in particular polyisocyanate and / or polyaziridine.

Method according to one of claims 1 to 7,

characterized, that the first printing layer by the action of an alkaline

Etching agent, in particular an alkali metal hydroxide or alkali carbonate, is structured.

Method according to claim 8,

characterized,

the alkaline etchant is used in a concentration of 0.5% to 3%, and / or at a temperature of 20 ° C to 50 ° C, and / or for a period of 0.5 s to 5 s.

Method according to one of claims 1 to 9,

characterized,

that the first printing layer is applied multicolored, in particular in the form of a color gradient, color gradient or true color image.

Method according to one of claims 1 to 10,

characterized,

that the first printing layer in the form of a grid, in particular a line grid with 60 lines / cm to 120 lines / cm and / or a

Line depth of 15 μιτι to 45 μιτι is applied.

Method according to one of claims 1 to 10,

characterized,

the first printing layer is applied in the form of a grid, in particular a cross-diagonal grid with a screen width of 40 cells / cm to 100 cells / cm and / or a depth of 15 μm to 45 μm. Method according to one of claims 1 to 12,

characterized,

that the first and / or second printing layer by gravure printing

is applied.

Method according to one of claims 1 to 12,

characterized,

in that the first and / or second printing layer is applied by screen printing, in particular with a screen thickness of 90T to 140T or 90S to 140S.

Method according to one of claims 1 to 14,

characterized,

the second printing layer is applied in the form of a graphic motif, alphanumeric character, logo, image, pattern, in particular guilloche pattern.

Method according to one of claims 1 to 15,

characterized,

the first printing layer is applied to a layer composite comprising one or more of the following layers: a

Carrier layer, a replication layer having a surface relief, a reflection layer, a protective layer, a volume hologram layer.

Method according to one of claims 1 to 15,

characterized,

in that a layer composite comprising one or more of the following layers is applied to the first and / or second printing layer a carrier sheet, a replication layer having a surface relief, a reflection layer, a protective layer, a volume hologram layer.

18. The method according to claim 17,

characterized,

that before applying the layer composite a

Height compensation layer, in particular of a paint a

Combination of butyl acrylate and PMMA with a layer thickness of 0.5 μιτι to 3 μιτι is applied to the first and / or second printing layer.

19. The method according to claim 17 or 18,

characterized,

that at least one layer of the layer composite is patterned using the second printing layer as a mask.

20. The method according to claim 19,

characterized,

in that the at least one layer of the layer composite structured using the second printing layer as a mask has a

Metal layer is.

21. Method according to claim 20,

characterized,

in that, to pattern the metal layer, a photoresist layer is applied to the metal layer, exposed from the side of the second print layer, and removed during development in the exposed areas. Method according to claim 21,

characterized,

that after developing the photoresist layer, the metal layer is patterned by etching.

A method according to claim 21 or 22,

characterized,

in that the first and / or second printing layer comprises a UV blocker which absorbs UV light in a wavelength range in which the photoresist layer is exposed.

Method according to one of claims 16 to 23,

characterized,

the layer composite comprises at least one lacquer layer with a UV blocker.

Method according to claim 24,

characterized,

that the lacquer layer with the UV blocker in the form of a graphic motif, alphanumeric character, logos, image, pattern,

especially Guillochenmusters, is applied.

Multi-layer body, in particular obtainable by means of a method according to one of claims 1 to 25, having a first print layer and a second print layer arranged on a surface of the first print layer, wherein the first print layer is patterned using the second print layer as a mask. Multilayer body according to Claim 26,

characterized,

the first and second printing layers are chemically crosslinked with each other.

Multilayer body according to Claim 26 or 27, characterized

characterized,

that the first and / or second printing layer has a layer thickness of 1 to 3 μιτι.

Multilayer body according to one of claims 26 to 28,

characterized,

the multilayer body has a replication layer with a

Surface relief includes.

Multilayer body according to claim 29,

characterized,

the surface relief introduced into the replication layer is an optically variable element, in particular a hologram, Kinegram® or Trustseal®, preferably a linear or crossed one

sinusoidal diffraction grating, a linear or crossed single or multi-level rectangular grid, a zero-order diffraction structure, an asymmetric relief structure, a blazed grating, a preferably isotropic or anisotropic matt structure, or a light-diffractive and / or refractive and / or light-focusing micro or nanostructure , a binary or continuous Fresnel lens, a binary or continuous Fresnel freeform surface, a Microprism structure or a combination structure thereof

formed.

31. Multilayer body according to one of claims 26 to 230,

characterized,

that the multi-layer body, a wax layer and / or a

Release layer includes.

32. Multilayer body according to claim 31,

characterized,

that a layer thickness of the replication layer of 1 μιτι to 5 μιτι preferably 1 μιτι to 3 μιτι amounts.

33. Multilayer body according to one of claims 26 to 32,

characterized,

that the multi-layer body comprises a removable carrier layer, in particular made of PET, PEN or BOPP, with a layer thickness of 6 μιτι to 50 μιτι, preferably from 12 μιτι to 50 μιτι.

34. Multilayer body according to one of claims 26 to 33,

characterized,

in that the multilayer body comprises an at least partial metal layer, in particular of aluminum, copper, chromium, silver and / or gold or an alloy thereof, with a layer thickness of 5 nm to 100 nm, preferably of 10 nm to 50 nm.

35. Multilayer body according to one of claims 26 to 34,

characterized, that the multi-layer body is a particular transparent

Protective lacquer layer, in particular of PVC, polyester, acrylate,

Nitrocellulose, Celluloseacetobutyrat or mixtures thereof, with a layer thickness of 0.5 μιτι to 10 μιτι preferably from 2 μιτι to 5 μιτι comprises.

Security document, in particular banknote, security,

Identification document, visa document, passport or credit card with a multi-layer body according to one of claims 26 to 35.