METHOD FOR PRODUCE A MULTI-LAYER BODY, MULTI-LAYER BODY, USE OF A MULTI-LAYER BODY AND A FIRST AND SECOND LAYER MADE OF A FIRST OR SECOND METAL, AND USE OF A HEATING DEVICE

Description

[0001] The invention relates to a method for producing a multilayer body, a multilayer body, the use of a multilayer body, the use of a first layer made of a first metal and a second layer made of a second metal in a multilayer body, and the use of a heat application device.

[0002] Single- or multi-layer structures are often used to decorate components and secure security documents such as banknotes, passports, ID cards, check cards, credit cards, visas, or certificates to create a memorable or imitative optical effect. For example, components can be given a metallic appearance using a transfer film that contains a metal layer in its transfer layer. Components can also be specifically assigned functions using transfer layers that contain electronic components such as touch displays. Furthermore, optically variable interference layer structures are used, for example, as security elements for securing security documents, but also for other decorative purposes. These create different color impressions for the viewer when tilted, thus creating an optically variable effect.

[0003] Such an interference layer structure is known from WO 2004 / 016441 A2 and necessarily has a spacer layer arranged between a reflection layer and a partially transparent layer in order to produce an optically variable effect by means of interference.

[0004] Furthermore, WO 2011 / 060910 A1 discloses a security element and a manufacturing method for a security element or a data carrier, wherein the security element comprises at least one microstructure.

[0005] Furthermore, a selectively metallized film and a corresponding manufacturing process are known from DE 101 43 523 A1.

[0006] A coated plastic card is also known from WO 98 / 03350 A1.

[0007] Furthermore, a see-through security element and a method for its production are known from DE 10 2019 115 391 A1.

[0008] The invention is based on the object of providing a method for producing a multilayer body and a multilayer body characterized by an improved, preferably novel, optical effect that further preferably differs from the previously described known optical effects. In particular, the invention is further based on the object of creating improved, preferably novel, optical effects and / or physical properties of a multilayer body, preferably by means of a first layer made of a first metal and a second layer made of a second metal.

[0009] This object is achieved by a method for producing a multi-layer body according to patent claim 1.

[0010] This object is further achieved by a multi-layer body according to patent claim 9.

[0011] Furthermore, this object is achieved by the use, as defined in claim 19, of a multi-layer body according to one of claims 9 to 18 as a component, in particular a decorative component, preferably for a vehicle, more preferably for a motor vehicle, as packaging material, as a sensor and / or as a security element.

[0012] Furthermore, this object is also achieved by using a heat application device according to patent claim 20. It has been shown that the inventive method for producing a multilayer body, the multilayer body, the use of the multilayer body, the use of a first layer made of a first metal and a second layer made of a second metal in a multilayer body, and the inventive use of a heat application device produce an improved optical appearance and / or improved physical properties of the multilayer body. The improved optical appearance and / or the improved physical properties are characterized by an improved metallic optical effect, which in particular has improved color.In particular, this achieves a color that differs from the color of the two metal layers alone or in combination. The color of the first and / or second layer preferably differs from the sum of the individual colors of the first and second layers. The improved physical properties are further characterized in particular by a modified electrical surface conductivity. Furthermore, it is possible to simultaneously utilize not only the improved metallic optical effect but also, in particular, the improved color with regard to the further improved physical properties, such as a modified electrical surface conductivity, so that the multilayer body can be used to specifically determine both the optical appearance and, for example, the electrical surface conductivity of components provided with the multilayer body.This makes it possible to simplify complex production processes and thus achieve a reduction in effort and therefore costs.

[0013] Color, chromaticity, or individual color or individual chromaticity refers to a color location within a color space. The color space can be, in particular, the CIELAB color space. The color space can also be the RGB color space (R = red; G = green; B = blue) or the CMYK color space (C = cyan; M = magenta; Y = yellow; K = black), or color spaces such as RAL, HKS, or the Pantone® color space.

[0014] A different or differing color is understood to be a color difference dE between two color locations in a color space. The color space can, in particular, be the CIELAB color space. A different color that is sufficiently perceptible to the human eye has a color difference dE in the CIELAB color space of at least 2, preferably at least 3, particularly preferably at least 5, and further preferably at least 10.

[0015] The color location, especially in the CIELAB color space, is usually determined with a colorimeter, for example a "Datacolor 650" spectrophotometer.

[0016] The value of dE (or Delta E or ΔE) between the color coordinates (L*,a*,b*) p and (L*,a*,b*) v is calculated as the Euclidean distance: dE p , v = L p ∗ − L v ∗ 2 + a p ∗ − a v ∗ 2 + b p ∗ − b v ∗ 2

[0017] The brightness value L* is perpendicular to the color plane (a*, b*). The a coordinate indicates the chromaticity and color intensity between green and red, and the b coordinate indicates the chromaticity and color intensity between blue and yellow. The larger the positive a and b values ​​and the smaller the negative a and b values, the more intense the hue. If a=0 and b=0, the hue is achromatic on the brightness axis. Typically, L* can take values ​​between 0 and 100, and a and b can vary between -128 and +127.

[0018] Registered or register or precise register or register accuracy or register accuracy refers to the positioning accuracy of two or more layers relative to one another. The register accuracy should be within a specified tolerance and as small as possible. At the same time, the register accuracy of several elements and / or layers with one another is an important feature for increasing process reliability. Precise positioning can be achieved in particular using sensory, preferably optically detectable, fiducials or register marks. These fiducials or register marks can either represent special separate elements or areas or layers or can themselves be part of the elements or areas or layers to be positioned.

[0019] It is also conceivable to provide a method for producing a multi-layer body, wherein the method comprises the following steps, which are carried out in particular in the following order: Providing a substrate; applying, in particular by vapor deposition, a first layer made of a first metal over the entire surface of the substrate; optionally partially applying a barrier layer, preferably a transparent and / or non-metallic barrier layer; applying, in particular by vapor deposition, a second layer made of a second metal over the entire surface such that the second layer is in direct contact with the first layer in the regions where the barrier layer is not present, and in the regions where the barrier layer is present, the first and second layers are separated from one another by the barrier layer.

[0020] It is also conceivable to provide a multi-layer body, wherein the multi-layer body comprises a first layer of a first metal and a second layer of a second metal and optionally a partially applied barrier layer, wherein the second layer is in direct contact with the first layer in the regions where the barrier layer is not present and, in the regions where the barrier layer is present, the first and second layers are separated from one another by the barrier layer.

[0021] It is also conceivable to provide a method for producing a multi-layer body, wherein the method comprises the following steps, which are carried out in particular in the following order: Providing a substrate; applying a first layer of a first metal to the substrate; applying a second layer of a second metal directly to the first layer in at least a first region.

[0022] In particular, a multi-layer body is obtained which comprises a first layer made of a first metal and a second layer made of a second metal, wherein the first and second layers are arranged directly on top of one another in at least one first region.

[0023] "Directly arranged or directly arranged one upon the other" is understood here to mean that the first and second layers are in direct and / or immediate contact with one another. In other words, no further layer is arranged between the first and second layers, so that the first and second layers, particularly in the at least one first region, directly and / or immediately adjoin one another or are arranged directly and / or immediately upon one another.

[0024] Preferably, there is therefore no interference layer structure here, in particular in the at least one first region and / or the at least one second region. Thus, in particular in the first region, there is no interference layer structure, in particular comprising a spacer layer arranged between a reflection layer and a partially transparent layer. It is also possible for there to be no interference layer structure in the at least one second region, in particular if the barrier layer is applied here in a layer thickness that suppresses or prevents interference effects, in particular for light from the wavelength range 380 nm to 800 nm, preferably due to the non-fulfillment of the λ / 2 or λ / 4 condition.Furthermore, it is possible to design the barrier layer in the at least one second region to be opaque or correspondingly slightly transparent or slightly translucent, so that the occurrence of interference is suppressed or prevented due to the attenuation of the radiation upon impacting and / or passing through the barrier layer. It is also fundamentally possible for the first and second layers to already be present in layer thicknesses and / or to have reflectivities such that the occurrence of interference is suppressed or prevented due to the reflection of the radiation upon impacting and / or the attenuation of the radiation upon passing through the first and / or second layer.

[0025] In other words, it is preferred if the optical appearance produced by the first and second layer of the multilayer body is not an optically variable effect based in particular on interference.

[0026] In this context, a region is understood to mean a defined area of ​​a layer or ply that, when viewed perpendicular to a plane spanned by the multilayer body, is occupied. For example, the multilayer body has at least one region or one or more regions, wherein the at least one region or each of the regions occupies a defined area when viewed perpendicular to a plane spanned by the multilayer body.

[0027] It is also preferably conceivable to use a first layer made of a first metal and a second layer made of a second metal in a multi-layer body to change the optical appearance and / or the physical properties, in particular the color and / or the electrical surface conductivity, of the first and / or second layer in at least one first region by directly arranging and / or applying the first layer and the second layer to one another in the at least one first region.

[0028] Furthermore, it is preferably conceivable to use a vapor deposition device, in particular a vacuum-based vapor deposition device, wherein by means of the vapor deposition device a first layer made of a first metal and a second layer made of a second metal are applied to a substrate in order to change the optical appearance and / or the physical properties of the first and / or second layer in at least one first region by directly applying the first layer and the second layer to one another in the at least one first region.

[0029] Advantageously, the vapor deposition device comprises one or more components selected from: a coating chamber, in particular a recipient, a holder, in particular for receiving the substrate, a gas supply device, at least one evaporator, in particular for evaporating and / or receiving the first and / or second metal, and a vacuum device, in particular for generating a vacuum in the housing by means of a vacuum pump. The evaporator preferably evaporates the first and / or the second metal, in particular by means of laser beams and / or magnetically deflected ions and / or electrons and / or by arc discharge and / or resistance heating. It is possible for the holder to be rotatable, in particular such that the substrate is also rotatable, preferably in the coating chamber.

[0030] It is also conceivable to use the multilayer body according to the invention, in particular according to one of claims 9 to 18, as a transfer film, in particular wherein the transfer film comprises a carrier layer and a transfer layer, preferably detachable from the carrier layer, preferably wherein the transfer layer is formed by the multilayer body according to the invention, in particular according to one of claims 9 to 18, and / or comprises the multilayer body according to the invention, in particular according to one of claims 9 to 18.

[0031] Furthermore, the use of such a transfer film and / or the multilayer body according to the invention as a hot stamping film and / or in-mold film, in particular as an in-mold decoration film (IMD film), insert-molding film, in-mold labeling film (IML film) and / or print-mold design film (PMD film) is conceivable.

[0032] Further advantageous embodiments of the invention are described in the subclaims.

[0033] According to the invention, a mixed layer, in particular comprising the first and the second metal, is / will be formed in the at least one first region between the first and second layers, in particular at least partially. This achieves in particular a color of the first and second layers which advantageously differs from the individual colors and the sum of the individual colors of the first and second layers. The sum of the individual colors preferably refers to the state immediately after the vapor deposition or application of the second metal to the first metal, without a mixed layer, in particular at least one alloy, having formed here. The mixed layer preferably refers to the state, at a time interval after the vapor deposition or application of the second metal to the first metal, in which in particular at least one alloy has formed.

[0034] It is further preferred if an alloy is formed by the first metal and the second metal in the at least one first region and / or in the mixed layer, in particular at least partially. This also achieves, in particular, a coloration of the first and second layers that advantageously differs from the individual colors and the sum of the individual colors of the first and second layers.

[0035] Thus, it is possible for the mixed layer to at least partially comprise the first and / or second layer, in particular such that the change in the optical appearance and / or the physical properties is present in the at least one first region on one and / or both surfaces of the first and / or second layer.

[0036] Furthermore, it is possible that in the at least one first region the optical appearance and / or the physical properties of the first and / or second layer are changed such that the change in the optical appearance and / or the physical properties in the at least one first region is present on one and / or both surfaces of the first and / or second layer.

[0037] It is also possible that in the at least one first region, in particular due to the chemical and / or physical reaction of the first and second layers with one another, the optical appearance and / or the physical properties of the first and / or second layer are / are changed in such a way that the optical appearance and / or the physical properties of the first and / or second layer are / are changed in comparison with the optical appearance and / or the physical properties of the first and / or second layer alone or in combination.

[0038] Different or changed in interaction or in combination or in total is understood here preferably with regard to the optical appearance and in particular the coloration, that the color thus created is different from the color created according to the additive or subtractive color mixture of the colors of the first layer made of the first metal and the second layer made of the second metal.

[0039] In other words, it is advantageous if, in the at least one first region, the optical appearance and / or the physical properties, in particular the color, the reflectivity, the transparency and / or the electrical surface conductivity of the first and / or second layer and / or the mixed layer are changed in such a way that the optical appearance and / or the physical properties of the first and / or second layer and / or the mixed layer differ from the optical appearance and / or the physical properties of the first and / or second layer alone or in combination.

[0040] It is also expedient if the color and / or reflectivity and / or transparency and / or surface roughness and / or electrical surface conductivity are / are modified in the at least one first region. In other words, it is expedient if at least one property selected from the group consisting of color, reflectivity, transparency, surface roughness, and electrical surface conductivity is / are modified in the at least one first region.

[0041] Preferably, optical appearance and / or physical properties are understood here to mean color, less preferably reflectivity and / or transparency. Physical properties are further preferably understood here to mean electrical surface conductivity.

[0042] Thus, it is particularly preferred that a color change occurs in the at least one first region, in particular one that differs from the color of the first layer made of the first metal and the color of the second layer made of the second metal alone or in combination.

[0043] It is thus advantageously possible for the color of the first and second layer to differ from the individual colors and the sum of the individual colors of the first and second layer.

[0044] It is preferred if the application of the first and / or second layer is carried out by physical vapor deposition (PVD). physical vapour deposition, PVD), preferably thermal vapor deposition, electron beam evaporation (English electron beam evaporation ) , Laser beam evaporation (English) pulsed laser deposition, pulsed laser ablation ) , Arc evaporation (English) arc evaporation, Arc-PVD), molecular beam epitaxy (engl. molecular beam epitaxy, MBE), sputtering, more preferably ion beam assisted deposition (engl. ion beam assisted deposition, IBAD), ion plating and / or ICB technique (English ionized cluster beam deposition, ICBD).

[0045] It is also preferred that the first and second layers are applied over the entire surface, in particular to the substrate, and / or that the second layer is applied over the entire surface to the first layer.

[0046] It is also advantageous that the application of the first and / or second layer takes place at a substrate temperature between -50 °C and +30 °C, preferably between -30 °C and +30 °C, particularly preferably between -10 °C and +10 °C and / or that the application of the first and / or second layer takes place at a pressure between 1x10 -6< mbar and 1x10 -3< mbar, preferably between 9x10 -5< mbar and 5x10 -4< mbar.

[0047] Furthermore, it is advantageous if the first and / or second metal have a melting temperature of 100 °C to 2000 °C, preferably of 150 °C to 1100 °C.

[0048] Advantageously, these temperatures and / or this pressure are present in a coating chamber, in particular a recipient, in which the first and / or the second layer are evaporated and / or applied.

[0049] It is also possible that the application of the first and / or second layer is carried out by chemical vapor deposition (CVD). chemical vapour deposition, CVD) and / or metal deposition, in particular electrolytic metal deposition and / or chemical metal deposition.

[0050] Advantageously, the chemical and / or physical reaction comprises an oxidation, a diffusion of the first and second layers into each other and / or an interfacial reaction.

[0051] Furthermore, it is preferred if the first layer made of a first metal and / or the second layer made of a second metal is applied by means of the parameters temperature, pressure, layer thickness, time and / or oxygen concentration in such a way that the first and the second layer react chemically and / or physically in the at least one first region, in particular by means of oxidation, diffusion of the first and second layers into one another and / or an interfacial reaction, in particular so that the optical appearance and / or the physical properties of the first and / or second layer are / are changed.In other words, the conditions of application of the first and / or the second layer, in particular the parameters selected from temperature, pressure, layer thickness, time and / or oxygen concentration, are selected such that the first layer and the second layer react chemically and / or physically, in particular by means of oxidation, diffusion of the first and second layers into each other and / or an interfacial reaction.

[0052] It is also conceivable that the first metal of the first layer has a lower or higher melting point than the second metal of the second layer.

[0053] Among other things, particularly further preferred embodiments of the first and second layers are described below: The first and / or second layer is preferably applied in a layer thickness between 1 nm and 200 nm, preferably between 5 nm and 40 nm, more preferably between 10 nm and 30 nm. Thus, it is possible for the first and / or second layer to have a layer thickness between 1 nm and 200 nm, preferably between 5 nm and 40 nm, more preferably between 10 nm and 30 nm.

[0054] It is also possible for the first layer to have an optical density (OD) between 0.1 and 4, preferably between 0.4 and 1.4, and / or for the second layer to have an optical density (OD) between 0.1 and 4, preferably between 0.3 and 1.3. Thus, it is further expedient for the first layer, particularly after application, to have an optical density (OD) between 0.1 and 4, preferably between 0.4 and 1.4, and / or for the second layer, particularly after application, to have an optical density (OD) between 0.1 and 4, preferably between 0.3 and 1.3.

[0055] The optical density (OD) is a measure of the attenuation of light after passing through a medium. The optical density (OD) can be determined from the ratio of the incident light (I 0 ) to the outgoing light (I) and thus from the inverse of the transmittance (T) as follows: OD = log 10 (I 0 / I) = - log 10 (1 / T).

[0056] The optical density (OD) of a metal layer depends, in particular, on the layer thickness used and, among other things, on the metal used.

[0057] Furthermore, it is advantageous that the mixed layer has a layer thickness between 2 nm and 400 nm, preferably between 10 nm and 80 nm, more preferably between 20 nm and 60 nm.

[0058] Advantageously, the first metal is indium (In), tin (Sn), silver (Ag), chromium (Cr), aluminum (Al), zinc (Zn) or copper (Cu) and / or the second metal is indium (In), tin (Sn), silver (Ag), chromium (Cr), aluminum (Al), zinc (Zn) or copper (Cu).

[0059] Further preferably, the following combinations of metals are used for the first and second layer and / or for the first and second metal: tin (Sn) and copper (Cu), indium (In) and copper (Cu), silver (Ag) and copper (Cu), aluminum (Al) and copper (Cu), chromium (Cr) and indium (In), chromium (Cr) and aluminum (Al) or indium (In) and silver (Ag), in particular or vice versa.

[0060] Furthermore, it is also possible to use the following combination of metals for the first and second layer and / or for the first and second metal: chromium (Cr) and aluminum (Al), in particular or vice versa.

[0061] In particular, it is possible to change the order of application of the first layer of the first metal and the second layer of the second metal.

[0062] In the following, among other things, particularly further preferred embodiments of the barrier layer are described: It is particularly preferred that the method further comprises the following step, which is carried out in particular between the step of applying the first layer and the step of applying the second layer: Applying a barrier layer, preferably a transparent and / or non-metallic barrier layer, in at least one second region onto the first layer, so that in the at least one second region the first layer and the second layer are separated from one another by the barrier layer.

[0063] Thus, it is preferred if the multi-layer body further comprises, in at least one second region, a barrier layer, preferably a transparent and / or non-metallic barrier layer, which is arranged between the first and the second layer, in particular such that in the at least one second region the first layer and the second layer are separated from one another by the barrier layer.

[0064] It is also possible to further use a barrier layer which is arranged between the first and the second layer in at least one second region, in particular wherein the at least one first and the at least one second region are arranged next to one another, in particular directly next to one another, so that in the at least one second region the first layer and the second layer are separated from one another by the barrier layer.

[0065] Preferably, the at least one first region and the at least one second region do not overlap. In other words, it is preferred if the at least one first region and the at least one second region are arranged next to one another, in particular directly next to one another.

[0066] This makes it possible to create a metallic optical effect that exhibits a different color, reflectivity, transparency, and / or electrical surface conductivity in certain surface regions. Thus, it is possible for the multilayer body to have, for example, a reddish-gold to yellow-gold color in the at least one first region and a reddish, particularly copper-colored, color in the at least one second region.

[0067] In particular, it is possible for different colors or chromaticities to be present in the at least one first region and in the at least one second region, in particular since in the at least one first region the optical appearance and / or the physical properties of the first and / or second layer are changed due to a chemical and / or physical reaction between the first and second layers. In the second region in particular, however, the first and second layers are separated from one another by the barrier layer, so that essentially the intrinsic color of the second metal is present here, which can optionally be changed by further processes as explained below. In the at least one first region in particular, however, a color is present which differs from the color of the metals of the first and second layers alone or in interaction and / or combination.

[0068] Thus, it is possible that the optical appearance and / or the physical properties of the first and / or second layer are different in the at least one first and the at least one second region.

[0069] Furthermore, this creates a combination of the first and second layers and / or the first and second metal that is arranged in exact register with one another. In particular, if the first and / or second layer is applied over the entire surface, the second layer covers both the first layer and the barrier layer, so that a different color or coloration with regard to the register to one another can be created without tolerance in the at least one first region and the at least one second region. If the first and / or the second layer is only applied in certain regions, such a combination that is arranged in exact register with one another is created at least in the regions in which the first and second layers or the barrier layer overlap.

[0070] Preferably, the at least one second region forms a one-dimensional or two-dimensional grid. Furthermore, it is advantageous if the at least one second region is designed in the form of a pattern, character, in particular an alphanumeric character, and / or a symbol.

[0071] It is preferred if the barrier layer is applied by gravure printing, screen printing, flexographic printing, and / or digital printing, particularly by inkjet printing or xerography. This allows for the creation of individualizations and / or complex patterns in high resolution.

[0072] However, it is also possible to evaporate the barrier layer in a vacuum chamber.

[0073] Furthermore, it is preferred if the at least one second region is applied, in particular printed, as a solid surface or as a decoration (with a solid surface and in particular with halftones). This makes it possible to create, in particular, intermediate color tones resulting from the barrier layer printed in halftones. The intermediate color tones are preferably generated from the colors resulting from the directly superimposed first and second layers in the at least one first region and the second layer made of the second metal in the at least one second region.

[0074] A halftone is preferably understood here as the simulation of a color tone or a brightness level using halftone dots, each of which has a uniform color and / or brightness. The size of the halftone dots is below the resolution of the human eye, in particular below approximately 200 µm. In particular, the number and / or size of the halftone dots in a defined surface area determines the color or brightness level that the human eye perceives in this defined surface area. If, for example, black halftone dots are used on a white background, 100% area coverage in the defined surface area with halftone dots corresponds to the color black, 0% area coverage in the defined surface area with halftone dots corresponds to the color white, and 50% area coverage in the defined surface area with halftone dots corresponds to the color medium gray.Depending on the degree of gradation, further different shades of gray can be simulated for the human eye. In the same way, using red dots on a white background, different gradations between 100% red (= 0% white) and white (= 0% red) can be simulated.

[0075] Preferably, the barrier layer comprises solvent-based or water-based components, individually or in combination selected from: polyurethane (PU), acrylate, polyolefin, polyol, polyester polyol, polyvinyl chloride (PVC), epoxy, or mixtures thereof, which can be crosslinked with crosslinking components, individually or in combination selected from: isocyanate, melamine, amine, carbodiimide, aziridine, UV-curable substances.

[0076] It is further preferred if the barrier layer has a layer thickness between 0.1 µm and 15 µm, preferably between 0.5 µm and 7.5 µm, more preferably between 1 µm and 5 µm.

[0077] Furthermore, it is possible that the barrier layer is colored, in particular that the barrier layer is colored by means of dyes and / or color pigments, and / or that the degree of pigmentation of the barrier layer is between 1% and 50%, preferably between 2.5% and 15%.

[0078] Furthermore, it is conceivable for the barrier layer to be colored or filled with pigments, dyes, opacifiers, or fillers. This makes it possible to create a transparent, colored, translucent, or opaque visual appearance for the barrier layer. Fillers, in particular, can be used to create a diffusely reflective metal surface. For example, it is possible to create a white or black barrier layer.

[0079] Transparent is preferably understood to mean that the respective layer has a transmission of visible light, preferably from the wavelength range between 380 nm and 780 nm, of more than 50%, preferably more than 70%, more preferably more than 85%, even more preferably more than 90%.

[0080] Opaque is preferably understood to mean that the respective layer has a transmission of visible light, preferably from the wavelength range between 380 nm and 780 nm, of less than 50%, in particular of less than 20%, preferably less than 5%.

[0081] The barrier layer is preferably physically drying or radiation-curable, in particular using light in the wavelength range between 100 nm and 380 nm. Thus, it is possible for the barrier layer to be curable using ultraviolet radiation (UV radiation, UV light). Furthermore, it is also possible for the barrier layer to be curable using electron beams and / or for the barrier layer to comprise or include one or more thermoplastics.

[0082] Furthermore, it is expedient if the barrier layer is additionally chemically crosslinked, for example by crosslinking components, individually or in combination selected from: isocyanates, melamines, amines, carbodiimides, aziridines.

[0083] Furthermore, it is possible for the barrier layer to be single-layered or multi-layered. For example, it is possible for the barrier layer to comprise a first barrier layer and a second barrier layer, in particular arranged one on top of the other.

[0084] It is also possible for the barrier layer to comprise a first barrier layer and a second barrier layer, in particular which are arranged next to one another. It is thus possible for a second barrier layer to be arranged next to a first barrier layer. The first and second barrier layers are preferably arranged according to a one-dimensional or two-dimensional grid. Furthermore, further barrier layers are conceivable which are arranged next to one another or on top of one another. Such barrier layers are preferably differently colored using dyes and / or color pigments. However, it is also possible for the at least one second region in which a first barrier layer is applied and the at least one second region in which a second barrier layer is applied to form different patterns, characters, in particular alphanumeric characters, and / or a symbol.

[0085] It is further advantageous that the electrical surface resistance of the first and / or second layer differs in the at least one first and the at least one second region, in particular that the electrical surface resistance between the at least one first region and the at least one second region differs by at least a factor of 10, preferably a factor of 15, more preferably a factor of 20. This makes it possible to specifically adapt the surface resistance in the at least one first and the at least one second region. Such regionally different surface resistances are preferably used in microelectronics, sensor technology and / or in flexible conductor tracks.

[0086] In the following, among other things, a particular application of heat to the multi-layer body is described: It is further preferred if the method further comprises the following step, which is carried out in particular after the step of applying the second layer: Applying heat to the multi-layer body, in particular to the first and / or second layer, in particular such that the optical appearance and / or the physical properties of the first and / or second layer are further changed in the at least one first and / or at least one second region.

[0087] This makes it possible to further modify or adjust the optical appearance and / or the physical properties of the first layer made of a first metal and / or the second layer made of a second metal of the multilayer body. For example, it is possible to further modify the color in the at least one first and / or second region. For example, the color in the at least one first region can be further modified from red gold to yellow gold to gold to bronze, in particular depending on the temperature or the duration of the heat exposure.

[0088] The change in color can also be traced based on the color difference dE, in particular which, with respect to the individually present metals, lies between two metals, in particular directly deposited or applied on one another, for the above-mentioned at least one first region, in particular at dE greater than 5, preferably at dE greater than 10, particularly preferably at dE greater than 15.

[0089] Thus, it is possible for the color level dE to differ by more than 5, preferably by more than 10, more preferably by more than 15, between the color of the first and second layers and / or the first and second metals alone, in particular present individually, and the color of the first and second layers and / or the first and second metals, which are applied and / or arranged directly on top of one another in the at least one first region.

[0090] It is also preferred that the color difference dE, based on the individually present first and second metals, in particular the first and second layer, or the individually present first and second layer, to the first and second metal applied directly to one another in the at least one first region or the directly adjacent first and second layer, is greater than 5, preferably greater than 10, particularly preferably greater than 15. It is thus expedient that the color difference dE, based on the individually present first and second layer, preferably made of the first and second metal, to the first and second layer, more preferably made of the first and second metal, applied directly, preferably to one another, in the at least one first region, is greater than 5, preferably greater than 10, particularly preferably greater than 15.

[0091] In other words, it is advantageously possible that the color difference of the individually present first layer made of a first metal and the second layer made of a second metal to the first and second layers, which are in particular applied and / or arranged directly on top of one another in the at least one first region, and / or the first and second metal, which are in particular applied and / or arranged directly on top of one another, is greater than 5, preferably greater than 10, particularly preferably greater than 15.

[0092] It is thus expedient that the color difference dE, based on the individually present first layer of a first metal and the individually present second layer of the second metal, to the first layer of the first metal and the second layer of the second metal applied directly to one another in the at least one first region, in particular which interact therewith, as explained above, and advantageously are not present individually, is greater than 5, preferably greater than 10, particularly preferably greater than 15.

[0093] Preferably, the multi-layer body, in particular the first and / or the second layer, is subjected to heat by means of a heat application device.

[0094] Thus, it is possible for the multi-layer body to be exposed to heat by means of a heat application device, in particular comprising a laser, a drying cabinet, a heating roller and / or an infrared radiator.

[0095] It is expedient if the heat application device comprises one or more components selected from conveyor belt, conveyor rollers, laser, drying cabinet, heating roller and / or infrared radiator.

[0096] It is also possible for the heat application device to be used further to change the optical appearance and / or the physical properties of the first layer made of a first metal and / or the second layer made of a second metal of the multi-layer body in at least one second region, wherein a barrier layer is arranged between the first and second layers in the at least one second region, in particular such that in the at least one second region the first layer and the second layer are separated from one another by the barrier layer. This makes it possible to further change or adjust the optical appearance and / or the physical properties of the first layer made of a first metal and / or the second layer made of a second metal of the multi-layer body in the at least one second region.

[0097] Preferably, the electrical surface resistance of the first and / or second layer is increased in the at least one first region by a factor of 15, preferably by a factor of 20, more preferably by a factor of 22, and / or in the at least one second region by a factor of 2.5, preferably by a factor of 5, more preferably by a factor of 10. This makes it possible to specifically adapt the surface resistance in the at least one first and the at least one second region.

[0098] It is also expedient if the electrical surface resistance of the first and / or second layer in the at least one first and the at least one second region is increased by a factor of 15, preferably a factor of 20, more preferably a factor of 22, in the at least one first region by applying heat to the multi-layer body and / or is increased by a factor of 2.5, preferably a factor of 5, more preferably a factor of 10, in the at least one second region.

[0099] It is advantageous that the multilayer body is exposed to heat at a temperature between 80 °C and 250 °C, preferably between 160 °C and 230 °C, and / or that the multilayer body is exposed to heat for a duration of between 0.5 min and 120 min, preferably 1 min and 3 min, and / or that the multilayer body is moved at a speed between 1 m / min and 40 m / min, preferably between 1 m / min and 3 m / min, when the multilayer body is exposed to heat. By selecting these parameters, it is possible to specifically change the optical appearance and / or the physical properties of the first and / or second layer and / or of the multilayer body depending on these parameters.

[0100] Furthermore, it is also possible that the method further comprises the following step, which is carried out in particular during and / or after the step of applying the first and / or second layer: Exposure of the multi-layer body, in particular the first and / or second layer, to oxygen and / or hydrogen, in particular gaseous oxygen and / or hydrogen.

[0101] This makes it possible, particularly by exposure to oxygen, to produce a further color change, particularly of the first and / or second layer and / or the multilayer body, preferably through subsequent oxidation. Furthermore, it is possible, particularly by exposure to hydrogen, to reduce a passivation layer, preferably through subsequent reduction.

[0102] In the following, further embodiments of the multi-layer body are described in particular: It is further expedient that the method further comprises the following step, which is carried out before the step of applying the first layer and / or after the step of applying the second layer: Applying one or more layers, in particular to the substrate and / or the second layer, selected from the group: protective layer, release layer, color layer, adhesion promoter layer, decorative layer, adhesive layer.

[0103] It is thus possible for the multi-layer body to further comprise one or more layers selected from the group: protective layer, release layer, color layer, adhesion promoter layer, decorative layer, adhesive layer.

[0104] Preferably, one or more of these layers are arranged between the substrate and the first layer and / or on the side of the second layer facing away from the first layer.

[0105] Advantageously, the method further comprises the following step, which is carried out in particular after the step of applying the first layer and / or after the step of applying the second layer: At least partial removal of the first and / or second layer.

[0106] It is therefore possible that the first and / or second layer has been removed, at least in part.

[0107] Preferably, the at least regional removal of the first and / or second layer is carried out by demetallization processes known per se, for example by means of an etching process with etching resist partially applied to the metal layer and / or an exposure process, in particular a mask exposure process with partially exposed, developed and etched photoresist and / or a wash ink partially applied beneath the metal layer by means of a lift-off process. However, it is also possible to remove the first and / or second layer in regions only in those regions that have a relief structure or only in those regions that do not have a relief structure, or if different relief structures are present in different regions, to remove the first and / or second layer only in those regions with one of the two different relief structures.For example, demetallization processes can also be used for this purpose, as described in particular in WO 2006084686 A2, in which, due to a relief structure that is designed differently in certain areas, a different exposure of a photosensitive layer or washing mask takes place according to the areas of the relief structure and as a result the layer of metal is removed in some areas or is retained in some areas according to the different exposure.

[0108] Furthermore, it is preferred if the substrate is or comprises a carrier layer.

[0109] The carrier layer is preferably made of ABS (= acrylonitrile butadiene styrene), ABS / PC, PET (= polyethylene terephthalate), PC (= polycarbonate), PMMA (= polymethyl methacrylate), PE (= polyethylene), PP (= polypropylene), and / or PPP (= polyether polycarbonate polyols). The layer thickness of the carrier layer is advantageously between 5 µm and 500 µm, in particular between 6 µm and 100 µm.

[0110] Preferably, at least the first and second layers form a transfer layer that can be transferred to a target substrate. It is also possible for the transfer layer to comprise additional layers, preferably selected from: a protective layer, a decorative layer, a color layer, and / or an adhesive layer.

[0111] Thus, a release layer is advantageously arranged between the carrier layer and the transfer layer, in particular between the carrier layer and the first layer, in particular which enables the transfer layer to be released from the carrier layer.

[0112] The release layer preferably has a layer thickness between 0.01 µm and 10 µm, preferably between 0.1 µm and 5 µm, and / or consists of waxes, polyethylene (PE), polypropylene (PP), cellulose derivatives and / or poly(organo)siloxanes.

[0113] It is also possible for the multilayer body to form or be a transfer film, in particular wherein the transfer film comprises a carrier layer and a transfer layer, preferably detachable from the carrier layer. In this case, it is possible for the transfer layer to be formed by the multilayer body according to the invention and / or to comprise the multilayer body according to the invention.

[0114] Advantageously, such a transfer film and / or the multilayer body is used as a hot stamping film and / or in-mold film, in particular as an in-mold decoration film (IMD film), insert-molding film, in-mold labeling film (IML film) and / or print-mold design film (PMD film).

[0115] Advantageously, the protective layer comprises one or more layers, wherein the layer thickness of a protective layer is in particular between 1 µm and 15 µm, preferably between 2 µm and 8 µm, and / or which individually or in combination comprise: isocyanate groups with hydroxyl groups, melamine resins with hydroxyl groups, polyisocyanates with hydroxyl-containing polymers, melamine resins with hydroxyl-containing polymers.

[0116] Furthermore, it is also possible that the one or more protective layers comprise components, individually or in combination selected from: solvent-based or water-based polyurethane (PU), acrylate, polyolefin, polyol, polyester polyol, polyvinyl chloride (PVC), epoxy, polyvinylidene fluoride (PVDF) or mixtures thereof, which can be crosslinked with crosslinking components, individually or in combination selected from: isocyanate, melamine, amine, carbodiimide, aziridine UV-curable substances.

[0117] Preferably, the one or more protective layers are transparent and / or have a transmission, in particular in the wavelength range between 380 nm and 780 nm, of at least 25%, preferably of at least 35%, more preferably of at least 85%.

[0118] Furthermore, it is possible for the one or more protective layers to be colored, in particular for the one or more protective layers to be colored by means of dyes and / or pigments, and / or for the degree of pigmentation of the one or more protective layers to be less than 15%, preferably less than 10%, more preferably less than 5%. It is also possible for the one or more protective layers to be colorless and / or for the degree of pigmentation of the one or more protective layers to be 0%. Thus, it is possible for the one or more protective layers to be or form a clear coat, in particular an unpigmented one.

[0119] The decorative layer is preferably a single-layer or multi-layer layer, in particular comprising one or more, preferably opaque, translucent or transparent layers, individually or in combination, selected from: colored lacquer layers, clear lacquer layers, replication lacquer layers, metal layers, optically variable layers, high refractive index (HRI) layers, barrier layers, adhesion promoter layers, adhesive layers, release layers.

[0120] In this case, it is expedient for the decorative layer to be formed in one or more layers. For example, it is possible for the decorative layer to comprise one or more colored lacquer layers, which are shaped in such a way that, in their interaction, they form a decorative colored pattern or element.

[0121] Furthermore, it is possible for the decorative layer to be formed over the entire surface or in a pattern, for example, in the form of alphanumeric characters, patterns, symbols, or motifs. Furthermore, it is expedient for the decorative layer to have additional optically variable layers, for example, with pigments, holograms, optical diffraction structures, lenses, prisms, interference layer structures, or cross-linked liquid crystals. Thus, it is advantageous for the decorative layer to have at least one layer with a decorative effect.

[0122] The layer thickness of the decorative layer is preferably between 0.1 µm and 15 µm, more preferably between 0.5 µm and 3 µm.

[0123] The color layer is preferably a lacquer layer colored using dyes and / or pigments. The color layer is preferably a layer made of solvent- or water-based components, selected individually or in combination from: polyurethane (PU), acrylate, polyolefin, polyol, polyester polyol, polyvinyl chloride (PVC), epoxy or mixtures thereof, which can be crosslinked with crosslinking components, selected individually or in combination from: isocyanate, melamine, amine, carbodiimide, aziridine, UV-curable substances, and which more preferably has a layer thickness between 0.1 µm and 15 µm, preferably between 0.5 µm and 10 µm, more preferably between 1 µm and 3 µm.

[0124] The adhesion promoter layer preferably has a layer thickness between 0.1 µm and 10 µm, preferably between 0.5 µm and 6 µm, more preferably between 1 µm and 3 µm. It is advantageous if the adhesion promoter layer comprises a layer of solvent- and / or water-based components, selected individually or in combination from: polyurethane (PU), acrylate, polyolefin, polyol, polyester polyol, polyvinyl chloride (PVC), epoxy, or mixtures thereof, which can be crosslinked with crosslinking components, selected individually or in combination from: isocyanate, melamine, amine, carbodiimide, aziridine, UV-curable substances.

[0125] The adhesive layer is preferably a layer comprising solvent- and / or water-based components, individually or in combination selected from: polyurethane (PU), acrylate, polyolefin, polyol, polyester polyol, polyvinyl chloride (PVC), epoxy or mixtures thereof, which can be crosslinked with crosslinking components, individually or in combination selected from: isocyanate, melamine, amine, carbodiimide, aziridine UV-curable substances, and wherein the adhesive layer has a layer thickness between 0.1 µm and 10 µm, preferably between 0.3 µm and 4 µm, more preferably between 0.5 µm and 3 µm.

[0126] It is possible that the multilayer body has the following layer structure: Carrier layer; optional release layer; optionally one or more protective layers; first layer made of a first metal; optionally partial barrier layer; second layer made of a second metal; adhesive layer.

[0127] Regarding the possible design of the layers, reference is made to the above statements. Furthermore, it is possible for the multi-layer body to further comprise at least one decorative layer, in particular arranged at least in some regions between the optional one or more protective layers and the first layer and / or between the first and second layers and / or between the second layer and the adhesive layer.

[0128] The features, effects, and advantages described in connection with the method for producing a multilayer body can also be transferred analogously to the multilayer body, the use of a multilayer body, the use of a first layer made of a first metal and a second layer made of a second metal in a multilayer body, and the use of a heat application device, and are therefore deemed to be disclosed. The same applies in the reverse direction: features, effects, and advantages described in connection with the multilayer body, the use of a multilayer body, the use of a first layer made of a first metal and a second layer made of a second metal in a multilayer body, and the use of a heat application device, are also transferable to the method for producing a multilayer body and are deemed to be disclosed.

[0129] In the following, embodiments of the invention are explained by way of example with the aid of the enclosed figures, which are not to scale. Fig. 1a to Fig. 1c schematically show a method for producing a multi-layer body Fig. 2a to Fig. 2c schematically show a method for producing a multi-layer body Fig. 3a to Fig. 3d schematically show a method for producing a multi-layer body Fig. 4 schematically shows a sectional view of a multi-layer body Fig. 5 schematically shows a sectional view of a multi-layer body Fig. 6 schematically shows a sectional view of a multi-layer body Fig. 7a to Fig. 7c schematically show a method for applying heat to a multi-layer body

[0130] Fig. 1a bis Fig. 1c show schematically a method for producing a multilayer body 12.

[0131] As in Fig. 1a As shown, a substrate 3 is first provided. As shown in Fig. 1a As shown, the substrate 3 already comprises a carrier layer 5, a release layer 6 and a protective layer 7.

[0132] However, it is also possible that the substrate 3 is the carrier layer 5 and the layers 6 and 7 are applied in previous steps, for example by means of printing, so that the Fig. 1a shown substrate 3 is obtained.

[0133] The carrier layer 5 is preferably a layer made of ABS (= acrylonitrile butadiene styrene), ABS / PC, PET (= polyethylene terephthalate), PC (= polycarbonate), PMMA (= polymethyl methacrylate), PE (= polyethylene), PP (= polypropylene) and / or PPP (= polyether polycarbonate polyols). The layer thickness of the carrier layer 5 is advantageously between 5 µm and 500 µm, in particular between 6 µm and 100 µm. Fig. 1a bis Fig. 1c The carrier layer 5 shown is, for example, a layer of PET with a layer thickness of 75 µm.

[0134] Advantageously, the protective layer 7 comprises one or more layers, in particular those having a layer thickness between 1 µm and 15 µm, preferably between 2 µm and 8 µm, and / or those having isocyanate groups with hydroxyl groups, melamine resins with hydroxyl groups, polyisocyanates with hydroxyl-containing polymers, or melamine resins with hydroxyl-containing polymers. Furthermore, it is also possible for the one or more protective layers to comprise solvent- or water-based components, individually or in combination selected from: polyurethane (PU), acrylate, polyolefin, polyol, polyester polyol, polyvinyl chloride (PVC), epoxy, polyvinylidene fluoride (PVDF), or mixtures thereof, and which can be crosslinked with crosslinking components, individually or in combination selected from: isocyanate, melamine, amine, carbodiimide, aziridine, UV-curable substances. Fig. 1a bis Fig. 1c The protective layer 7 shown is, for example, a layer comprising polyisocyanates with hydroxyl-containing polymers with a layer thickness of 5 µm.

[0135] Preferably, the release layer 6 has a layer thickness between 0.01 µm and 10 µm, preferably between 0.1 µm and 5 µm, and / or consists of waxes, polyethylene (PE), polypropylene (PP), cellulose derivatives and / or poly(organo)siloxanes. Fig. 1a bis Fig. 1c The release layer 6 shown is, for example, a wax layer with a layer thickness of 1 µm.

[0136] As in Fig. 1b As shown, a first layer 1 made of a first metal is applied to the substrate 3. Subsequently, as shown in Fig. 1c shown, a second layer 2 made of a second metal is applied directly to the first layer in at least one first region 10, so that in the at least one first region 10 the optical appearance and / or the physical properties of the first 1 and / or second layer 2 are changed, in particular due to a chemical and / or physical reaction of the first 1 and the second layer 2 with one another.

[0137] The method for producing a multilayer body 12 comprises, as in Fig. 1a bis Fig. 1c shown, comprises the following steps, which are carried out in particular in the following order: Providing a substrate 3; applying a first layer 1 made of a first metal to the substrate 3; applying a second layer 2 made of a second metal directly to the first layer 1 in at least one first region 10, such that in the at least one first region 10 the optical appearance and / or the physical properties of the first layer 1 and / or second layer 2 are changed, in particular due to a chemical and / or physical reaction between the first layer 1 and the second layer 2.

[0138] This is how the Fig. 1c shown multi-layer body 12 is obtained, wherein the multi-layer body 12 has a first layer 1 made of a first metal and a second layer 2 made of a second metal, wherein the first layer 1 and the second layer 2 are arranged directly on top of one another in at least one first region 10, so that in the at least one first region 10 the optical appearance and / or the physical properties of the first 1 and / or second layer 2 are changed, in particular due to a chemical and / or physical reaction of the first 1 and the second layer 2 with one another.

[0139] It is preferred that the application of the first 1 and / or the second layer 2 is carried out by physical vapor deposition (PVD). physical vapour deposition, PVD), preferably thermal vapor deposition, electron beam evaporation (English electron beam evaporation ) , Laser beam evaporation (English) pulsed laser deposition, pulsed laser ablation ) , Arc evaporation (English) arc evaporation, Arc-PVD), molecular beam epitaxy (engl. molecular beam epitaxy, MBE), sputtering, more preferably ion beam assisted deposition (engl. ion beam assisted deposition, IBAD), ion plating and / or ICB technique (English ionized cluster beam deposition, ICBD).

[0140] It is also preferred that the first layer 1 and the second layer 2, as in Fig. 1a bis Fig. 1c shown, applied over the entire surface, in particular to the substrate 3 and / or the first layer 1.

[0141] It is also advantageous that the application of the first layer 1 and / or second layer 2 takes place at a substrate temperature between -50 °C and +50 °C, preferably between -30 °C and +30 °C, particularly preferably between -10 °C and +10 °C and / or that the application of the first layer 1 and / or second layer 2 takes place at a pressure between 1*10 -6< mbar and 1*10 -3< mbar, preferably between 9*10 -5< mbar and 5*10 -4< mbar.

[0142] Furthermore, it is advantageous if the first and / or second metal has a melting temperature of 100 °C to 2000 °C, preferably of 150 °C to 1100 °C.

[0143] Advantageously, this temperature and / or this pressure is present in a coating chamber, in particular in a recipient, in which the first layer 1 and / or the second layer 2 are evaporated and / or applied.

[0144] Advantageously, the chemical and / or physical reaction comprises an oxidation, a diffusion of the first layer 1 and second layer 2 into each other and / or an interfacial reaction.

[0145] Furthermore, it is preferred if the first layer 1 made of a first metal and / or the second layer 2 made of a second metal is applied by means of the parameters temperature, pressure, layer thickness, time and / or oxygen concentration in such a way that the first layer 1 and the second layer 2 react chemically and / or physically in the at least one first region 10, in particular by means of oxidation, diffusion of the first and second layers 2 into one another and / or an interfacial reaction, in particular so that the optical appearance and / or the physical properties of the first layer 1 and / or second layer 2 are / are changed.In other words, the conditions of application of the first layer 1 and / or the second layer 2, in particular the parameters selected from temperature, pressure, layer thickness, time and / or oxygen concentration, are selected such that the first layer 1 and the second layer 2 react chemically and / or physically, in particular by means of oxidation, diffusion of the first layer 1 and second layer 2 into each other and / or an interfacial reaction.

[0146] Preferably, the first layer 1 and / or the second layer 2 is applied in a layer thickness between 1 nm and 200 nm, preferably between 5 nm and 40 nm, more preferably between 10 nm and 30 nm.

[0147] Thus, it is further expedient that the first layer 1, in particular after application, has an optical density (OD) between 0.1 and 4, preferably between 0.4 and 1.4, and / or that the second layer 2, in particular after application, has an optical density (OD) between 0.1 and 4, preferably between 0.3 and 1.3.

[0148] Preferably, the first layer 1 and / or the second layer 2 are applied in a layer thickness between 1 nm and 200 nm, preferably between 5 nm and 40 nm, more preferably between 10 nm and 30 nm. Thus, it is possible for the first and / or second layer to have a layer thickness between 1 nm and 200 nm, preferably between 5 nm and 40 nm, more preferably between 10 nm and 30 nm.

[0149] The optical density (OD) of a metal layer depends, in particular, on the layer thickness used and, among other things, on the metal used.

[0150] Advantageously, the first metal is indium (In), tin (Sn), silver (Ag), chromium (Cr), aluminum (Al), zinc (Zn) or copper (Cu) and / or the second metal is indium (In), tin (Sn), silver (Ag), chromium (Cr), aluminum (Al), zinc (Zn) or copper (Cu).

[0151] Further preferably, the following combinations of metals are used for the first layer 1 and second layer 2 or for the first and second metal: tin (Sn) and copper (Cu), indium (In) and copper (Cu), silver (Ag) and copper (Cu), aluminum (Al) and copper (Cu), chromium (Cr) and indium (In), chromium (Cr) and aluminum (Al) or indium (In) and silver (Ag), in particular or vice versa.

[0152] Furthermore, it is preferred if an alloy is formed by the first metal and the second metal in the at least one first region, in particular at least partially.

[0153] The Fig. 1b und Fig. 1c The first layer 1 shown is a layer of tin (Sn) and has an optical density of 0.7. Fig. 1c The second layer shown in Figure 2 is a layer of copper (Cu) and has an optical density of 0.3. Thus, it is conceivable that the first metal, here tin (Sn), and the second metal, here copper (Cu), preferably form a mixed layer and / or at least partially a bronze (Sn-Cu) alloy. Fig. 1b und Fig. 1c The layers shown are applied by vapor deposition as explained above.

[0154] For tin (Sn), the above-mentioned optical density and the individual metal layer present have an L*a*b* value of L=76.95; a=-2.76; b=0.24, and for copper (Cu), the above-mentioned optical density and the individual metal layer present have an L*a*b* value of L=79.68; a=6.04; b=16.44, as can be seen from Table 1. (Table 1) L a B Sn 76,95 -2,76 0,24 Cu 79,68 6,04 16,44 Sn+Cu 70,51 1,2 11,42 Sn+Cu (180°) 65,84 0,6 31,15 Sn+Cu (200°C) 60,9 4,64 44,26

[0155] The Fig. 1c The multilayer body 4 shown here comprises the two metals tin (Sn) and copper (Cu) in layers 1 and 2, resulting in a red-gold to yellow-gold color, in particular which is different from the sum of the intrinsic color of tin (Sn) and (Cu).

[0156] For copper (Cu) evaporated onto tin (Sn), for the above-mentioned optical densities, as metal layers evaporated on top of each other and immediately after evaporation, there is, for example, an L*a*b* value of L=70.51; a= 1.2; b=11.42.

[0157] Table 2 shows examples of the respective color differences. The color difference is calculated using the following formula for dE: dE p , v = L p ∗ − L v ∗ 2 + a p ∗ − a v ∗ 2 + b p ∗ − b v ∗ 2

[0158] The color difference between tin (Sn), as a single metal layer, and copper (Cu) vapor-deposited on tin (Sn), as a multilayer body, is dE = 13.49, as shown in Table 2. The color difference between copper (Cu), as a single metal layer, and copper (Cu) vapor-deposited on tin (Sn), as a multilayer body, is dE = 11.52, as also shown in Table 2.

[0159] As in the Fig. 1a bis Fig. 1c Therefore, as shown, a first layer 1 made of a first metal and a second layer 2 made of a second metal are used to change the optical appearance and / or the physical properties of the first layer 1 and / or second layer 2 in at least one first region 10 in a multi-layer body 12 by directly applying and / or arranging the first layer 1 and the second layer 2 on top of one another in the at least one first region 10.

[0160] Fig. 2a bis Fig. 2c show schematically a method for producing a multilayer body 12.

[0161] The Fig. 2a bis Fig. 2c The procedure shown corresponds to the one described in the Fig. 1a bis Fig. 1c shown procedure with the difference as in Fig. 2c It is shown that a mixed layer 4, in particular comprising the first and second metals, is formed in the at least one first region 10 between the first layer 1 and the second layer 2. It is further possible for an alloy to be formed, in particular at least partially, by the first metal and the second metal in the at least one first region 10 in the mixed layer.

[0162] The Fig. 2c The mixed layer 4 shown here comprises the two metals tin (Sn) and copper (Cu), resulting in a red-gold to yellow-gold color, in particular which is different from the sum of the intrinsic colors of tin (Sn) and (Cu).

[0163] The mixed layer 4 forms particularly after heat conditioning. For example, after heat conditioning at 180°C, an L*a*b* value of L=65.84; a=0.6; b=31.15 is measured, and after heat conditioning at 200°C, an L*a*b* value of L=60.9; a=4.64; b=44.26 is measured (see Table 1). The heat conditioning at 180°C and 200°C refer to two separate material samples.

[0164] The color difference between tin (Sn), as a single metal layer, and copper (Cu) deposited on tin (Sn), as a multilayer body, and after heat conditioning at 180°C, is dE = 33.02, as shown in Table 2.

[0165] The color difference between copper (Cu), as a single metal layer, and copper (Cu) deposited on tin (Sn), as a multilayer body, and after heat conditioning at 180°C, is dE = 20.92, as also listed in Table 2.

[0166] The color difference between tin (Sn), as a single metal layer, and copper (Cu) deposited on tin (Sn), as a multilayer body, and after heat conditioning at 200°C, is dE = 47.43, as shown in Table 2.

[0167] The color difference between copper (Cu), as a single metal layer, and copper (Cu) deposited on tin (Sn), as a multilayer body, and after heat conditioning at 200°C, is dE = 33.59, as shown in Table 2. (Table 2) dE dE Sn, Sn+Cu 13,49 dE Sn, Sn+Cu (180°) 33,02 dE Sn, Sn+Cu (200°) 47,43 dE Cu, Sn+Cu 11,52 dE Cu, Sn+Cu (180°) 20,92 dE Cu, Sn+Cu (200°) 33,59

[0168] Fig. 3a bis Fig. 3d show schematically a method for producing a multilayer body 12.

[0169] The Fig. 3a bis Fig. 3d The procedure shown corresponds to the one described in the Fig. 1a bis Fig. 1c or the one in Fig. 2a bis Fig. 2c shown procedure with the difference that as in Fig. 3c shown, between the step of applying the first layer 1 and the step of applying the second layer 2, a barrier layer 8, preferably a transparent and / or non-metallic barrier layer 8, is applied to the first layer 1 in at least one second region 11, in particular so that in the at least one second region 11 the first layer 1 and the second layer 2 are separated from one another by the barrier layer 8.

[0170] Thus, a multi-layer body 12 is obtained which, in at least one second region 11, further comprises a barrier layer 8, preferably a transparent and / or non-metallic barrier layer 8, which is arranged between the first layer 1 and the second layer 2, in particular such that in the at least one second region 11, the first layer 1 and the second layer 2 are separated from one another by the barrier layer 8.

[0171] As in Fig. 3c und Fig. 3d As shown, the at least one first region 10 and the at least one second region 11 preferably do not overlap, but rather are arranged directly next to one another. In other words, it is particularly possible for the at least one first region 10 to be designed complementarily to the at least one second region 11.

[0172] Preferably, the at least one second region 11 forms a one-dimensional or two-dimensional grid. Furthermore, it is advantageous if the at least one second region 11 is designed in the form of a pattern, character, in particular an alphanumeric character, and / or a symbol.

[0173] It is preferred if the barrier layer 8 is applied by means of gravure printing, screen printing, flexographic printing and / or digital printing, in particular by means of ink-jet printing or xerography, in particular in the decoration.

[0174] However, it is also possible to evaporate the barrier layer in a vacuum chamber.

[0175] The barrier layer 8 preferably comprises solvent- or water-based components, individually or in combination selected from: polyurethane (PU), acrylate, polyolefin, polyol, polyester polyol, polyvinyl chloride (PVC), epoxy or mixtures thereof, which can be crosslinked with crosslinking components, individually or in combination selected from: isocyanate, melamine, amine, carbodiimide, aziridine, UV-curable substances, and / or has a layer thickness between 0.1 µm and 15 µm, preferably between 0.5 µm and 7.5 µm, more preferably between 1 µm and 5 µm.

[0176] At the Fig. 3d The barrier layer 8 shown is a barrier layer 8 applied by means of gravure printing, in particular in the decoration, made of an aqueous polyurethane dispersion crosslinked by means of carbodiimide, which, in particular after curing, has a layer thickness of 1.5 µm.

[0177] As in Fig. 3d shown and in Fig. 1a bis Fig. 1cor Fig. 2a bis Fig. 2c As explained, the second layer 2 made of the second metal is then applied over the entire surface, so that in the first regions 10 the second layer 2 is applied directly, ie without any intermediate layer, to the first layer 1.

[0178] How to continue in the Fig. 3d As shown, in the at least one first region 10, the copper (Cu) of the second layer 2 lies directly on the tin (Sn) of the first layer 1, and in the at least one second region 11, the copper (Cu) lies on the barrier layer 8. As a result, a reddish-gold to yellow-gold color can be seen in the at least one first region 10, while in the at least one second region, a reddish, "copper-colored" inherent color of the copper can be seen. Thus, different physical properties, here in the form of different color impressions, are present in the at least one first region and the at least one second region.

[0179] Furthermore, different surface resistances are present in the at least one first region and the at least one second region. Fig. 3d The multilayer body shown has a surface resistance of 5 Ωm in the at least one first region 10 and a surface resistance of 100 Ωm in the at least one second region 11. The surface resistances were determined using the Loresta-GP MCP-T610 device with the 4-pole method (MCP-TP03P measuring head).

[0180] It is thus advantageous that the electrical surface resistance of the first layer 1 and / or second layer 2 in the at least one first region 10 and the at least one second region 11 is different, in particular that the electrical surface resistance between the at least one first region 10 and the at least one second region 11 differs by at least a factor of 10, preferably a factor of 15, more preferably a factor of 20.

[0181] Fig. 4 shows a schematic sectional view of a multilayer body 12.

[0182] The Fig. 4 The multilayer body 12 shown essentially corresponds to the one shown in Fig. 1c shown multi-layer body 12. Thus, the multi-layer body 12 comprises a first layer 1 made of a first metal and a second layer 2 made of a second metal, wherein the first layer 1 and the second layer 2 are arranged directly on top of one another in at least one first region 10, so that in the at least one first region 10, the optical appearance and / or the physical properties of the first and / or second layer 2 are changed, in particular due to a chemical and / or physical reaction of the first 1 and the second 2 layer with one another. In contrast to the Fig. 1c The multilayer body 12 shown consists of the first layer 1 of the Fig. 4 multilayer body 12 made of chromium (Cr) and has an optical density OD of 1.13. Also in contrast to the Fig. 1c The second layer 2 of the multilayer body 12 shown in Fig. 4 shown multilayer body 12 made of aluminum (Al) and has an optical density OD of 1.35. As shown in Fig. 4 Both layers 1 and 2 are shown applied over the entire surface.

[0183] Fig. 5 shows a schematic sectional view of a multilayer body 12.

[0184] The Fig. 5 The multilayer body 12 shown corresponds to the one in Fig. 3d shown multilayer body 12, so that with regard to the design of the multilayer body 12, reference is made here to the above statements.

[0185] The Fig. 5 The multi-layer body 12 shown therefore comprises a first layer 1 made of a first metal and a second layer 2 made of a second metal and a partially applied barrier layer 8, wherein the second layer 2 is in direct contact with the first layer 1 in the areas where the barrier layer is not present and, in the areas where the barrier layer 8 is present, the first layer 1 and the second layer 2 are separated from one another by the barrier layer 8.

[0186] Furthermore, it is possible that the barrier layer 8 is colored, in particular that the barrier layer is colored by means of dyes and / or pigments, and / or that the degree of pigmentation of the barrier layer 8 is between 1% and 50%, preferably between 2.5% and 15%.

[0187] Furthermore, it is conceivable for the barrier layer 8 to be colored or filled with pigments, dyes, opacifiers, or fillers. This makes it possible for the barrier layer 8 to create a transparent, colored, translucent, or opaque visual appearance. Fillers, in particular, can be used to create a diffusely reflective metal surface. For example, it is possible to create a white or black barrier layer 8.

[0188] Preferably, the barrier layer 8 is physically drying or radiation-curable, in particular by means of light in the wavelength range between 100 nm and 380 nm. Thus, it is possible for the barrier layer 8 to be curable by means of ultraviolet radiation or UV light. Furthermore, it is also possible for the barrier layer 8 to be curable by means of electron beams and / or for the barrier layer to comprise or include one or more thermoplastics.

[0189] Preferably, there is no interference layer structure here, in particular in the at least one first region 10 and / or the at least one second region 11. Thus, in particular in the first region 10, there is no interference layer structure, in particular comprising a spacer layer arranged between a reflection layer and a partially transparent layer. It is also possible for there to be no interference layer structure in the at least one second region 11, in particular if the barrier layer 8 is applied here in a layer thickness that suppresses or prevents interference effects, in particular for light in the wavelength range 380 nm to 800 nm, preferably due to the non-fulfillment of the λ / 2 or λ / 4 condition. Furthermore, it is possible to design the barrier layer 8 opaque in the at least one second region 11, so that the occurrence of interference is also suppressed or prevented.It is also fundamentally possible for the first layer 1 and the second layer 2 to already be present in layer thicknesses and / or reflectivities such that the occurrence of interference is suppressed or prevented.

[0190] In other words, it is preferred if the optical appearance produced by the first layer 1 and second layer 2 of the multi-layer body 12 is not an optically variable effect based in particular on interference.

[0191] As in Fig. 5 Shown here are both the first layer 1 and the second layer 2 applied over the entire surface.

[0192] Fig. 6 shows a schematic sectional view of a multilayer body 12.

[0193] The Fig. 6 The multilayer body 12 shown corresponds to the one in Fig. 5 shown multilayer body 12 with the difference that the first layer 1 and second layer 2 are at least partially removed.

[0194] Preferably, the at least partial removal of the first layer 1 and / or second layer 2 takes place by demetallization, for example by means of an etching process with etching resist partially applied to the metal layer and / or an exposure process, in particular a mask exposure process with partially exposed, developed and etched photoresist and / or by means of a lift-off process with wash ink partially applied beneath the metal layer. However, it is also possible to remove the first layer 1 and / or second layer 2 in regions only in those regions that have a relief structure or only in those regions that do not have a relief structure, or if different relief structures are present in different regions, to remove the first layer 1 and / or second layer 2 only in those regions with one of the two different relief structures.

[0195] Fig. 7a bis Fig. 7c schematically show a method for applying heat to a multi-layer body 12.

[0196] As in Fig. 7a und Fig. 7b As shown, it is further possible to apply heat to the multi-layer body 12, in particular the first layer 1 and / or the second layer 2, in particular so that in the at least one first region 10 and / or the at least one second region 11 the optical appearance and / or the physical properties of the first layer 1 and / or the second layer 2 are further changed.

[0197] This is the case with Fig. 7a shown multilayer body 12 around the one already shown in Fig. 3d or Fig. 5 shown multilayer body 12. As shown in Fig 7b As shown, the multi-layer body 12 is first subjected to a temperature of 160 °C for 2 minutes, so that in the at least one first region 10 a discoloration from red gold to yellow gold to gold to bronze takes place, which is further intensified by further heat application for 6 minutes at 200 °C. In addition to the color change, a reduction in gloss takes place, in particular in the form of a matte effect. Furthermore, the surface resistances also change further in the at least one first region 10 and the at least one second region 11. Thus, in the Fig. 7b The multilayer body 12 shown now has a surface resistance of 110 Ωm in the at least one first region and a surface resistance of more than 1000 Ωm in the at least one second region after the heat application.

[0198] Thus, the electrical surface resistance of the first layer 1 and / or second layer 2 is preferably increased in the at least one first region 10 by a factor of 15, preferably by a factor of 20, more preferably by a factor of 22, and / or in the at least one second region by a factor of 2.5, preferably by a factor of 5, more preferably by a factor of 10.

[0199] It is thus advantageous that the multilayer body 12 is subjected to heat at a temperature between 80 °C and 250 °C, preferably between 160 °C and 230 °C, and / or that the multilayer body 12 is subjected to heat for a duration between 0.5 min and 120 min, preferably 1 min and 3 min.

[0200] Preferably, for the further loading of the multilayer body 12, multilayer bodies are used whose first layer 1 and second layer 2 comprise the following combinations of metals: tin (Sn) and copper (Cu), indium (In) and copper (Cu), silver (Ag) and copper (Cu), aluminum (Al) and copper (Cu), chromium (Cr) and indium (In), chromium (Cr) and aluminum (Al) or indium (In) and silver (Ag), in particular or vice versa.

[0201] Preferably, the multi-layer body 12, in particular the first layer 1 and / or the second layer 2, is subjected to heat by means of a heat application device 14, as in Fig. 7c shown. Preferably, the heat application device 14 comprises a laser, a drying cabinet, a heating roller, and / or an infrared radiator.

[0202] As in Fig. 7c As shown, the heat application device 14 comprises one or more components selected from conveyor belt 13a, conveyor rollers 13b, laser, drying cabinet, heating roller and / or infrared radiator 13c.

[0203] At the Fig. 7c In the heat application device 14 shown, a multilayer body 12 located on the conveyor belt 13a is moved, preferably at a speed between 1 m / min and 40 m / min, through the infrared radiator 13c to apply heat to the multilayer body 12. The conveyor belt 13a is driven, for example, by means of the transport rollers 13b.

[0204] Thus, a use of a heat application device 14 for changing the optical appearance and / or the physical properties of a first layer 1 made of a first metal and / or a second layer 2 made of a second metal of a multi-layer body 12 in at least one first region 10, wherein the first layer 1 and the second layer 2 are arranged directly on top of one another in the at least one first region 10, as in Fig. 7a bis Fig. 7c shown, appropriate.

[0205] With the Fig. 7cThe heat application device 14 shown thus makes it possible to further change the optical appearance and / or the physical properties of the first layer 1 made of a first metal and / or the second layer 2 made of a second metal of the multi-layer body 12 in at least one second region 11, wherein in the at least one second region 11 a barrier layer 8 is arranged between the first layer 1 and the second layer 2, in particular so that in the at least one second region 11 the first layer 1 and the second layer 2 are separated from one another by the barrier layer 8.

[0206] Furthermore, it is possible to subject the multilayer body 12 to heat treatment in a drying cabinet at a temperature of 200°C. For this purpose, the drying cabinet has several heating elements, for example in the form of heating coils. List of reference symbols

[0207] 1First layer made of a first metal 2Second layer made of a second metal 3Substrate 4Mixed layer 5Carrier layer 6Release layer 7Protective layer 8Barrier layer 9Adhesive layer 9Base body 10, 11Areas 12Multi-layer body 13aConveyor belt 13bConveyor rollers 13cLaser, drying cabinet, heating roller and / or infrared radiator 14Heating device

Claims

1. Method for producing a multilayer body (12), wherein the method comprises the following steps, which are carried out, in particular, in the following order: - providing a substrate (3); - applying a first layer (1) made of a first metal onto the substrate (3); - applying a second layer (2) made of a second metal directly onto the first layer (1) in at least one first region (10), such that the optical appearance and / or the physical properties of the first (1) and / or second layer (2) are changed in the at least one first region (10), in particular due to a chemical and / or physical reaction of the first (1) and the second layer (2) with each other; characterised in that a mixing layer (4), in particular comprising the first and the second metal, is formed in the at least one first region (10) between the first (1) and second layer (2), in particular at least partially.

2. Method according to claim 1, characterised in that an alloy is formed by the first metal and the second metal in the at least one first region (10) and / or in the mixing layer (4), in particular at least partially, and / or the application of the first (1) and / or the second layer (2) is carried out by physical vapour deposition (PVD), preferably thermal evaporation, electron beam evaporation, pulsed laser deposition / pulsed laser ablation, arc evaporation (Arc-PVD), molecular beam epitaxy (MBE), sputtering, further preferably ion beam assisted deposition (IBAD), ion plating and / or ICB technology (ionised cluster beam deposition, ICBD), in particular wherein the application of the first (1) and / or second layer (2) is carried out at a substrate temperature of between -50°C and +50°C, preferably between -30°C and +30°C, particularly preferably between -10°C and +10°C, and / or the application of the first (1) and / or second layer (2) is carried out at a pressure of between 1x10-6 mbar and 1x10-3 mbar, preferably between 9x10-5 mbar and 5x10-4 mbar, and / or the first (1) and / or the second layer (2) is applied with a layer thickness of between 1nm and 200nm, preferably between 5nm and 40nm, further preferably between 10nm and 30nm.

3. Method according to one of the preceding claims, characterised in that the method further comprises the following step, which is implemented in particular between the step of applying the first layer (1) and the step of applying the second layer (2): applying a barrier layer (8), preferably a transparent and / or non-metallic barrier layer (8), in at least one second region (11) onto the first layer (1), in particular such that in the at least one second region (11), the first layer (1) and the second layer (2) are separated from each other by the barrier layer (8), preferably wherein the barrier layer (8) is applied by means of intaglio printing, silkscreen printing, flexographic printing and / or digital printing, in particular by means of inkjet printing or xerography.

4. Method according to one of the preceding claims, characterised in that the method further comprises the following step, which is implemented before the step of applying the first layer (1) and / or after the step of applying the second layer (2): - applying one or more layers (6, 7, 9), in particular onto the substrate (3) and / or the second layer (2), selected from the group: protective layer (7), detachment layer (6), coloured layer, adhesion agent layer, decorative layer, and / or adhesive layer (9).

5. Method according to one of the preceding claims, characterised in that the first (1) and / or the second layer (2) are applied over the entire surface, in particular onto the substrate (3) and / or the first layer (1) and / or the method further comprises the following step, which is implemented in particular after the step of applying the first layer (1) and / or after the step of applying the second layer (2): - at least regionally removing the first (1) and / or second layer (2).

6. Method according to one of the preceding claims, characterised in that the method further comprises the following step, which is implemented in particular after the step of applying the second layer (2): supplying the multilayer body (12), in particular the first (1) and / or the second layer (2), with heat, in particular such that in the at least one first (10) and / or the at least one second region (11), the optical appearance and / or the physical properties of the first (1) and / or second layer (2) are further changed, in particular wherein supplying the multilayer body (12) with heat is carried out with a temperature of between 80°C and 250°C, preferably between 160°C and 230°C, and / or supplying the multilayer body (12) with heat is carried out for a duration of between 0.5 min and 120 min, preferably 1 min and 3 min, and / or the electrical surface resistance of the first (1) and / or second layer (2) is increased by a factor of 15, preferably a factor of 20, further preferably a factor of 22, in the at least one first (10) and the at least one second region (11) by the multilayer body (12) being supplied with heat in the at least one first region (10) and / or is increased by a factor of 2.5, preferably a factor of 5, further preferably a factor of 10, in the at least one second region (11).

7. Method according to one of the preceding claims, characterised in that the colour distance dE in relation to the individually present first layer made of a first metal and the individually present second layer made of the second metal towards the first layer made of the first metal and second layer made of the second metal applied directly one after the other in the at least first region is greater than 5, preferably greater than 10, particularly preferably greater than 15.

8. Method according to one of the preceding claims, characterised in that the method comprises the following step, which is implemented in particular during and / or after the step of applying the first (2) and / or second layer (3): - supplying the multilayer body (12), in particular the first (2) and / or the second layer (3), with oxygen and / or hydrogen, in particular gaseous oxygen and / or hydrogen.

9. Multilayer body (12), comprising a first layer (1), applied to a substrate, made of a first metal and a second layer (2) made of a second metal, wherein the first (1) and the second layer (2) are arranged directly on top of each other in at least one first region (10), such that, in the at least one first region (10), the optical appearance and / or the physical properties of the first (1) and / or second layer (2) are changed, in particular due to a chemical and / or physical rection of the first (1) and the second layer (2) with each other, characterised in that a mixing layer (4) is formed, in particular comprising the first and the second metal, in the at least one first region (10) between the first (1) and second layer (2), in particular at least partially.

10. Multilayer body (12) according to claim 9, characterised in that the first metal and the second metal form an alloy, in particular at least partially, in the at least one first region (10) and / or in the mixing layer (4).

11. Multilayer body (12) according to one of claims 9 or 10, characterised in that the optical appearance and / or the physical properties of the first (1) and / or second layer (2) are changed in the at least one first region (10), in particular due to the chemical and / or physical reaction of the first (1) and the second layer (2) with each other, in such a way that the optical appearance and / or the physical properties of the first (1) and / or second layer (2) are changed in comparison to the optical appearance and / or the physical properties of the first (1) and / or second layer (2) on their own or in collaboration.

12. Multilayer body (12) according to one of claims 9 to 11, characterised in that the first metal is indium (In), tin (Sn), silver (Ag), chromium (Cr), aluminium (Al), zinc (Zn) or copper (Cu), and / or the second metal is indium (In), tin (Sn), silver (Ag), chromium (Cr), aluminium (Al), zinc (Zn) or copper (Cu).

13. Multilayer body (12) according to one of claims 9 to 12, characterised in that the first layer (1) has an optical density (OD) of between 0.1 and 4, preferably between 0.4 and 1.4, and / or the second layer (2) has an optical density (OD) of between 0.1 and 4, preferably between 0.3 and 1.3, and / or the first (1) and / or the second layer (2) has a layer thickness of between 1 nm and 200 nm, preferably between 5 nm and 40 nm, further preferably between 10 nm and 30 nm.

14. Multilayer body (12) according to one of claims 9 to 13, characterised in that the multilayer body (12) further comprises a barrier layer (8), preferably a transparent and / or non-metallic barrier layer (8), in at least one second region (11), said barrier layer being arranged between the first (1) and the second layer (2), such that the first layer (1) and the second layer (2) are separated from each other by the barrier layer (8) in the at least one second region (11), and / or the at least one second region (11) forms a one-dimensional or two-dimensional grid and / or the at least one second region (11) is formed in the shape of a pattern, character, in particular an alphanumerical character, and / or a symbol.

15. Multilayer body (12) according to claim 14 characterised in that the barrier layer (8) comprises solvent-based or water-based components selected from: polyurethane (PU), acrylate, polyolefin, polyol, polyester polyol, polyvinyl chloride (PVC), epoxide or mixtures thereof, in particular that can be crosslinked with isocyanate, melamine, amine, carbodiimide, aziridine and / or UV-curable materials, and / or the barrier layer (8) has a layer thickness of between 0.1 µm and 15 µm, preferably between 0.5 µm and 7.5 µm, further preferably between 1 µm and 5 µm, and / or the barrier layer (8) is coloured, in particular the barrier layer (8) is coloured by means of colourants and / or pigments, and / or the degree of pigmentation of the barrier layer (8) is between 1% and 50%, preferably between 2.5% and 15%.

16. Multilayer body (12) according to one of claims 14 or 15, characterised in that the optical appearance and / or the physical properties of the first (1) and / or the second layer (2) are different in the at least one first (10) and the at least one second region (11) and / or the electrical surface resistance of the first (1) and / or second layer (2) is different in the at least one first (10) and the at least one second region (11), in particular the electrical surface resistance differs between the at least one first region (10) and the at least one second region (11) by a factor of at least 10, preferably by a factor of 15, further preferably by a factor of 20.

17. Multilayer body (12) according to one of claims 9 to 16, characterised in that the multilayer body (12) further comprises one or more layers (6, 7, 9) selected from the group: protective layer (7), detachment layer (6), coloured layer, adhesion agent layer, decorative layer, and / or adhesive layer (9), and / or the first (1) and / or second layer (2) is removed at least in regions.

18. Multilayer body (12) according to one of claims 9 to 17, characterised in that the colour distance dE in relation to the individually present first layer made of a first metal and the individually present second layer made of the second metal towards the first layer made of the first metal and second layer made of the second metal arranged directly one on top of the other is greater than 5, preferably greater than 10, particularly preferably greater than 15.

19. Use of a multilayer body (12) according to one of claims 9 to 18 as a component, in particular a decorative component, preferably for a vehicle, further preferably for a motor vehicle, for a notebook, for entertainment electronics, for household devices, as packaging material, as a sensor and / or as a security element.

20. Use of a heat supply device (14) for changing the optical appearance and / or the physical properties of a first layer (1) made of a first metal and / or a second layer (2) made of a second metal of a multilayer body (12) in at least one first region (10), wherein the first (1) and the second layer (2) are arranged directly one on top of the other in the at least one first region (10), wherein a mixing layer (4), in particular comprising the first and the second metal, is formed by supplying the multilayer body with heat in the at least one first region (10) between the first (1) and second layer (2), in particular at least partially.

21. Use according to claim 20, characterised in that the heat supply device (14) is further used for changing the optical appearance and / or the physical properties of the first layer (1) made of a first metal and / or the second layer (2) made of a second metal of the multilayer body (12) in at least one second region (11), wherein a barrier layer (8) is arranged in the at least one second region (11) between the first (1) and the second layer (2), in particular such that the first layer (1) and the second layer (2) are separated from each other by the barrier layer (8) in the at least one second region (11), in particular the electrical surface resistance of the first (1) and / or second layer (2) is increased in the at least one first (10) and the at least one second region (11) in the at least one first region (10) by a factor of 15, preferably by a factor of 20, further preferably by a factor of 22, and / or is increased in the at least one second region (11) by a factor of 2.5, preferably by a factor of 5, further preferably by a factor of 10.