RU2296378C2 - Multi-layered body with first layer sensitive to laser radiation and second layer sensitive to laser radiation and method for forming multi-layer image in such a multi-layered body - Google Patents

Abstract

FIELD: multi-layered body and method for producing multi-layered image in such a multi-layered body.

SUBSTANCE: multi-layered body contains two layers sensitive to laser radiation with partial overlapping. First and second laser radiation sensitive layers contain colorant, which under effect of laser radiation loses color or under effect of laser radiation changes its color, or laser radiation sensitive layer contains alloyed material, which under effect of laser radiation is subject to blackening. In first layer sensitive to laser radiation a multi-layered laser-induced component part of image may be formed, while in second laser radiation sensitive layer black marking may be formed, preferably a grayscale image, and/or special background layer at sections is located as intermediate layer between laser radiation sensitive layers and acts as locking layer, which is not transparent for laser radiation. In accordance to method of forming of multi-layered image in multi-layered body, multi-layered image is composed of several laser-induced components of image.

EFFECT: creation of multi-layered body, which realizes high degree of protection from forgery and special marking induced by laser.

2 cl, 7 dwg

Description

The invention relates to a multilayer body made as a multilayer film, preferably a transfer film or a laminated film, or a laminated composite material from a deposited at least one covering film layer and preferably an input with a laser-sensitive layer. The invention also relates to a method for forming a multilayer image in such a multilayer body.

Known elements consisting of a material sensitive to laser radiation. For example, various embodiments of polymer elements are known from WO 96/35585, in particular in the form of bulky bodies or coatings that contain a mixture of various pigments. Due to laser processing, color marking is carried out on a bulk element made of plastic or on a coating.

WO 98/19686 describes a method using special yellow, magenta, and cyan pigments that are activated in the first step by ultraviolet radiation and only bleached (bleached) in the next second step.

From DE 19955338 there is also known a method for forming color markings by laser treatment using a mixture of blue pigment, magenta pigment and yellow pigment, these pigments being selectively bleached by red laser radiation, green laser radiation and blue laser radiation. This method is described with reference to a polymer element that is made from a material with an appropriate mixture of pigments.

From WO 94/12352 it is known to perform polychrome color marking on a polymer element that contains a mixture of pigments and can be made in the form of a volumetric body and as a coating, by processing with laser radiation with different wavelengths. The formation of color is carried out by the fact that pigments, when processed by laser radiation, change their color due to the conversion (transition) of color. From EP 0 327 508 a method is known in which the laser-sensitive dye A and the laser-insensitive dye B are contained in two separate layers lying one above the other or, alternatively, in one common layer, and due to the laser irradiation, the dye A is discolored. By laser treatment, a color marking is thereby obtained, which, however, only provides for a change in the color of dye A in order to obtain only a maximum two-color image.

EP 0190997 B1 discloses a method in which a polymer layer or a polymer plate is provided as a coating on a metal plate and contains an additive which, when processed by laser radiation, must change color, in particular, either by converting color from one color to another, or by converting to black color.

From DE 3738330 A1, a laser marking method for applying to a pigment (dyed) coating of a surface is known, wherein the pigments of the dyed coating at different temperatures change their internal molecular structure and produce different colors. Using laser radiation, locally specific surface temperatures are realized, whereby color laser markings are obtained.

GB 2240948 A also describes laser marking of an identity card. Laser marking is carried out here by removing various color layers. The resulting laser marking looks like a color marking.

DE 4131964 A1 describes laser markings of a multilayer film with a metal layer and with a hologram structure. Marking is carried out by local destruction of the metal layer carrying the hologram.

From EP 0420261, a hot stamping film with a hologram structure is known which, by means of laser processing, gives individual characteristics in order to protect it from counterfeiting. Laser irradiation results in a change in material or color or the removal of partial regions in the film structure.

EP 0 219 011 B1 describes a special method for laser marking identity cards. In this method, laser markings are printed in black in various transparent layers of the card. In transparent layers interacting with each other, parallax images are obtained in this way.

The basis of the invention is the task of creating a multilayer body, which through laser processing provides particularly high protection against counterfeiting and special laser-induced marking. The objective of the invention is also the creation of a method of manufacturing complex laser-induced markings of a new type.

The invention solves the problem by means of a multilayer body according to paragraph 1 and a method for forming a laser-induced multilayer image in such a multilayer body according to paragraph 9 related to the method.

Due to the fact that the multilayer body contains a first laser-sensitive layer and a second laser-sensitive layer, in which variously made component parts of the laser-induced image can be formed, a complex composite laser-induced multilayer image is created. In a laser-sensitive layer with a laser-sensitive coloring agent, it becomes possible to form a multi-color laser-induced component of the image, which, when using a suitable laser-sensitive mixture of coloring agents from two or three bleached components of the coloring agents, can be made into a multi-color image or full color image. In another laser-sensitive layer, another laser-sensitive material may be used, that is, a different mixture of dyes or also a material with impurities of carbon or soot, in which another color marking can be formed during laser processing, preferably a multicolor (polychromic) color image , or black marking, preferably a grayscale image.

The various laser-sensitive layers can be arranged more or less overlapping with each other, preferably in separate regions, and are more or less transparent, preferably in regions. With appropriately defined control of laser processing, various laser-sensitive layers can produce specific various laser-induced image components that can interact to produce a multilayer image of any complexity.

Multilayer images with particularly interesting optical effects become possible if, in addition to several laser-sensitive layers, the layer structure also contains diffraction or hologram structures, which, for example, give different optical effects at different viewing angles in conjunction with different induced layers located in different layers laser component parts of the image.

Preferred embodiments are described below with reference to the drawings.

In order to be able to selectively select the desired laser-induced markings when possible selectively in individual laser-sensitive layers when irradiated with laser radiation, the laser-sensitive layers must be made in such a way that they are sensitive only under certain conditions for the laser, for example, only under certain conditions the wavelength of laser radiation or a certain angle of incidence of radiation. Additionally, a special background layer can also be placed as an intermediate layer between the laser-sensitive layers, which acts like a blocking layer for a specific laser radiation, for example, depending on the wavelength of the laser radiation, the angle of incidence of the radiation, etc. This background layer acting as a barrier layer can also preferably be performed locally, that is, only under the local area of the laser-sensitive layer located above it, preferably only in the area which is located under the laser-induced marking. In addition to only the local location of such locking and intermediate layers, other special effects can also be obtained, for example, such that when laser irradiation in areas with an intermediate layer, laser-induced marking is obtained only in the upper layer sensitive to laser radiation, and in areas without an intermediate layer in both laser-sensitive layers then laser-induced markings arranged one above the other are obtained as combined markings. Particularly interesting optical effects are obtained if the laser-sensitive materials of the layers are different, so that, for example, color marking is formed in one layer and black marking in the other layer, preferably as a grayscale image.

The drawings show the following:

Figure 1 is a cross-sectional view of an embodiment of a transfer film with two layers sensitive to laser radiation;

FIG. 2 is a sectional view of an exemplary embodiment of a laminated film with a corresponding structure, as in the case of a transfer film in FIG. 1;

Figure 3 is a cross-sectional view of another exemplary embodiment of a transfer film with two laser-sensitive layers with a modified sequence of layers;

4 is a representation with exploded elements of a layered body of several covering films and inputs using two layers sensitive to laser radiation;

Figure 5 is a sectional view of another embodiment;

6 is a sectional view of the exemplary embodiment of FIG. 5 for illustrating laser processing;

FIG. 7 is a plan view of a laser-induced image for the exemplary embodiment of FIGS. 5 and 6.

In the case of the hot stamping film shown in FIG. 1, we are talking about a multilayer body with two layers 4 sensitive to laser radiation, which are made on both sides of the reflective layer 5r. By laser processing of this multilayer body, various laser-induced markings can be applied in laser-sensitive layers so that a composite laser-induced multilayer image is formed. The corresponding is true for the layered film shown in FIG. 2, which in its layered structure corresponds to the transfer film of FIG. 1. The same is true for the hot stamping film shown in FIG. 3, which has an altered layer structure, but also two laser-sensitive layers 4, 4a. The layered body shown in FIG. 4 also has two laser-sensitive layers, namely, layer 4, which is located on the lower side of the upper covering film 30 in the hot stamping film placed thereon, and layer 32, which is made as a separate doped covering film.

The structure of individual multilayer bodies is described in detail below with reference to the drawings, as well as laser processing, with which a laser-induced component of the image can be formed, made as a full-color image. In addition, a method has been described in which a grayscale image can be formed for another layer sensitive to laser radiation as a laser-induced component of the image.

In the case of the film of FIG. 1, the layers are arranged in the following order:

The carrier layer 1, the removable layer 2, the protective layer 3, the laser-sensitive layer 4, the reflection layer 5r, the laser-sensitive layer 4, the additional varnish layer 7 and the adhesive layer 6. Located on both sides of the reflection layer 5r are laser-sensitive the layers of radiation 4 can be performed identically, that is, the reflective layer is placed in this case in a generally laser-sensitive layer. However, laser-sensitive layers can be made different. In adjacent regions of the laser-sensitive layer 4 and the reflective layer 5r adjacent to each other, a diffraction structure 5b is formed. Alternatively, structure 5b may be implemented as a hologram structure. Increased security against counterfeiting can be provided in one embodiment by the fact that two laser-sensitive layers adjacent to the diffraction or hologram structure can be made in the same or different way. Lacquer layer 5, which is optional, is made in this case as a transparent layer or as a light backing layer. Alternatively, the varnish layer 5 and the adhesive layer 6 are absent, and the second laser-sensitive layer 4 located below the reflective layer 5r shown in FIG. 1 is made as a laser-sensitive adhesive layer.

Figure 2 presents an example of a layered film with a sequence of layers corresponding to the structure of the hot stamping film. It includes a so-called covering (upper) film 30, a laser-sensitive layer 40, an intermediate layer 50 forming a background layer, which is optional, and an adhesive layer 60, which is also optional. The laser-sensitive layer 40 is appropriately arranged as the laser-sensitive layer 4 on both sides of the reflective layer 50r, and accordingly, as provided for in the embodiment of FIG. 1, both the laser-sensitive layer can be made in various ways or the same. Accordingly, as in the embodiment of the hot stamping film of FIG. 1, and in the case of the layered film of FIG. 2, a diffraction and / or hologram structure 50 b is provided, namely, also in the region of both laser-sensitive layers 40 and the reflecting layer between them layer 50r.

During laser processing of the hot stamping film of FIG. 1 or the layered film of FIG. 2, component parts of the image, which are in different layers, are respectively formed in the layers lying one above the other sensitive to laser radiation. Laser processing is preferably carried out after the corresponding film is applied to the substrate and irradiated from the outside. Alternatively, it is also possible that the film undergoes laser treatment before application. In this case, laser irradiation can be performed from different sides of the film.

The various laser-induced image components in the laser-sensitive layers arranged on top of each other are obtained by the fact that the laser-sensitive layers contain different laser-sensitive material, and thus, under various material-specific laser conditions, laser-induced components can be generated images in various layers sensitive to laser radiation. Alternatively, only the upper or lower laser-sensitive layer can be processed by changing the angle of exposure. This possibility is ensured by the fact that the reflecting layer 5r is transparent to laser radiation during perpendicular irradiation, and when irradiated at an acute angle, it is less transparent or opaque. Differences are also ensured by irradiating the diffraction structure, so that with the appropriate setting of the angle of irradiation of the laser radiation, the upper laser-sensitive layer can be processed separately to form a specific laser-induced component of the image, and the radiation does not reach the lower laser-sensitive layer. In this way, it is also possible to separately process the laser-sensitive layers located one above the other, even if they are made of the same laser-sensitive material.

In the exemplary embodiment of FIG. 3, two laser-sensitive layers 4, 4a are also provided. They are separated by a background layer 5 arranged between them. In the case of a background layer, we are talking about a layer that highly reflects the laser radiation used in laser processing. In addition, this layer is opaque and absorbent with respect to the unreflected part of the laser radiation, so that during laser processing to form laser-induced markings in the upper laser-sensitive layer 4, the laser radiation does not pass into the laser-sensitive layer 4a below it. The background layer 5 is placed under the laser-sensitive layer 4 exclusively in the region in which the laser-induced image component is to be formed in the laser-sensitive layer 4. In the region outside this, the background layer 5 is not fulfilled, that is, in this region there is a laser-transparent material or, preferably, a laser-sensitive material of the lower laser-sensitive layer 4a. In these areas, in which the background layer is thus not formed, laser-induced component of the image in the lower laser-sensitive layer 4a can be formed due to laser radiation.

Preferably, both laser-sensitive layers 4, 4a made of different laser-sensitive material are suitable for various material-specific laser processing conditions. Thus, it is also possible that when laser-induced marking is formed in the lower laser-sensitive layer 4a, there is no simultaneous laser-induced change in the upper laser-sensitive layer 4.

To protect the substrate from incident laser radiation, an additional background layer 5a is placed on the lower side of the lower laser-sensitive layer 4a. This background layer 5a prevents the laser light from reaching the substrate during laser processing.

In the embodiment of FIG. 4, we are talking about a body consisting of various layers of covering (external) films and input layers. The upper covering film on its lower side has a layered structure consisting of a varnish layer 5c, a reflective layer 5r, a laser-sensitive layer 4, a background layer 5 and an adhesive layer 6. In a varnish layer 5c, a reflective layer 5r and a laser-sensitive layer 4, a diffraction and / or hologram structure 5b is made.

These layers deposited on the lower side of the cover film 30 are layers of a hot stamping film that is applied to the lower side of the cover film. Placed under the cover film 30, the cover film 32 is configured as a laser-sensitive film. It thus forms a second layer sensitive to laser radiation. In the illustrated embodiment, the laser-sensitive material is carbon doped and / or carbon black. This is a material that is carbonized during laser irradiation, so that in this layer formed by the covering film 32, a laser-induced component of the image is formed by blackening. By changing the conditions of the laser irradiation, for example, changing the laser power and / or the laser wavelength, it is possible to form a grayscale image.

An input layer 90 is located under the doped covering film 32 and another input layer 90 is below it. These input layers can preferably be made of paper or plastic, preferably in the form of input films. A cover film 30 is applied to the lower side of the lower inlet layer 90, and another cover film 30 is applied thereon.

Laser processing for the formation of various laser-induced image components in the laser-sensitive layers 4 and 32 is carried out in the examples presented accordingly, as in the variants of figures 1 and 3.

The following describes in more detail how a component of a full color image can be formed in a laser-sensitive layer, which consists of a mixture of dyes of three laser-sensitive dye components, by means of laser-induced discoloration. In the case of laser-sensitive material, this is a three-component mixture consisting of a blue pigment component, a purple pigment component, and a yellow pigment component.

When bleaching at the first stage, a blue or green, or red color marking is formed by means of the fact that this place is irradiated with a laser with a certain wavelength, whereby a certain component of the pigment is discolored.

To develop a blue color, you only need to bleach the yellow pigment component. To do this, use the light of a blue laser. Bleaching requires a certain minimum intensity. In addition, a certain pulse duration should not be exceeded. In order to get a green marking at the first stage, only the component of the magenta pigment needs to be discolored. To do this, use the light of a green laser. In order to get the red marking at the first stage, you only need to discolor the component of the blue pigment. For this, red laser light is used.

In order to form a color marking in this area in blue, magenta or yellow, this section is processed by the laser in the second stage, namely, the wavelength of laser radiation, with which the pigment component that has not yet been discolored in this area is discolored. If a blue color marking is formed at the first stage, then the blue pigment component and the magenta pigment component are not discolored in this area. In order to form a blue color in this area, the purple pigment component should be discolored in the second stage. This is done by the green laser light. Thus, a blue marking is obtained in this area.

If at the second stage instead of this blue marking a magenta mark is to be obtained, then the blue mark formed at the first stage should be processed by a red laser beam.

Thus, the blue pigment in this area is discolored, so that the purple pigment remains uncolored in this area. Thus, purple marking is obtained in this area.

Accordingly, it is possible to form a blue marking or a yellow marking from the green marking formed in the first step, which is formed from the blue pigment and the yellow pigment that has not been discolored therein, namely by processing with a blue laser light or a red laser light.

Accordingly, the red color marking formed in the first step can be converted in the second step to yellow or magenta, namely by laser processing in the second step using green laser light or blue laser light.

In order to obtain a transparent portion, that is, a white portion, if the background layer 5 is white in the portion processed in the first and second steps, in the third step, this portion must be treated with laser radiation whose wavelength is set so as to discolor the component remaining on This area is uncolored after the second stage, that is, the yellow marking should be discolored by the blue laser light, the magenta marking should be discolored by the green light, and the blue marking should be discolored by the red laser light.

In a similar manner, other adjacent portions in the laser-sensitive layer 4 are then processed to form additional color markings in the hot-stamped film layer 4. In this way, a full-color image can be formed.

Laser processing can also be used to form color markings or a full-color image due to color conversion (transition) in a dye or dyes in a laser-sensitive layer. Laser processing can be carried out in an appropriate manner in subsequent steps of the method. As dyes, that is, color-giving materials, pigments are used. In most cases, they are insoluble, and, as a rule, we are talking about inorganic substances. As dyes, mainly soluble organic dyes can also be used. The conversion (transition) of color occurs, respectively, under specific conditions of laser radiation, which are used in laser processing at individual stages.

A suitably described bleaching and color conversion method can also be used if the laser-sensitive material consists of only one or two dye components. Also, other components of the dye and other conditions of laser radiation, in particular other laser wavelength ranges, can be used in laser processing.

Laser processing is usually carried out on a film deposited on a substrate. But alternatively, it can be carried out before the film is carried, and only the film is irradiated, namely, when the protective layer 3 or some other layer, for example, the background layer 5, is made as opaque to laser radiation or partially transparent layer, or as a layer opaque to laser radiation in a certain wavelength range, or if an additional protective layer is provided that absorbs ultraviolet (UV) radiation. The laser treatment is then preferably carried out before applying the film, wherein the laser radiation is directed to the back of the film, that is, to the lower background layer 5 or the adhesive layer 6, and thereby the laser-sensitive layer 4 is also processed on the other hand, so that it is similar form color markings. The background layer 5 or the adhesive layer 6 are transparent or at least partially transparent to the respective laser radiation in such applications.

The composition of the layers used in the described embodiments is described as follows:

Removable Layer 2 (Detachable Layer)

Toluene 99.5 parts

Essential paraffin (dropping point 90 ° C) 0.5 part

Protective layer 3 (Protective varnish layer)

Methyl ethyl ketone 61.0 part

Diabetoalcohol 9.0 parts

Methyl methacrylate (Tg = 122 ° C) 18.0 parts

Polyethylene dispersion (23% in xylene)

(softening point 140 ° C) 7.5 parts

High molecular weight dispersant

additive (40%, amine number 20) 0.5 parts

Filler (aluminosilicate) 4.0 parts

Laser-sensitive layer 4 (first coat of colored varnish)

Methyl ethyl ketone 34.0 parts

Toluene 26.0 parts

Ethyl Acetate 13.0 parts

Cellulose nitrate (low viscosity, 65% in alcohol) 20.0 parts

Linear Polyurethane (Fp.> 200 ° C) 3.5 parts

High molecular weight dispersant

additive (40%, amine number 20) 2 parts

e.g. blue pigment 15: 4 0.5 parts

red pigment 57: 1 0.5 parts

yellow pigment 155 0.5 parts

Background layer 5 (second layer of colored varnish)

Methyl ethyl ketone 40.0 parts

Toluene 22.0 parts

Ethylene-Vinyl Acetate-Triple Copolymer (Fp. = 60 ° C) 2.5 parts

PVC (Tg: 89 ° C) 5.5 parts

Polyvinyl chloride (Tg: 40 ° C) 3.0 parts

Dispersing additive (50%, acid number 51) 1.0 part

Titanium dioxide (d = 3.8-4.2 g / cm ³ ) 2.6 parts

Adhesive layer 6

Methyl ethyl ketone 55.0 parts

Toluene 12.5 parts

Ethanol 3.5 parts

Polyvinyl acetate (softening point 80 ° C) 6.0 parts

Butyl / methyl methacrylate (Tg: 80 ° C) 8.0 parts

Ethyl Meta-Polyacrylate (Tg: 63 ° C) 3.0 parts

Methacrylate Copolymer (Tg: 80 ° C) 5.0 parts

Unsaturated polyester (softening point 103 ° C) 3.5 parts

Silica 3.5 parts

The invention in conclusion is briefly described with the most significant advantages and functions with reference to Fig.5-7.

A multilayer data carrier is created that contains at least two different laser-sensitive layers, the laser-sensitive layer 1 can preferably be personalized in a multicolor manner, and the additional laser-sensitive layer 2 can preferably be personalized in a monochromatic manner.

Laser-sensitive materials can be installed for this in such a way that marking can be realized in both materials by means of laser radiation of a specific wavelength and intensity.

The laser-sensitive layers are preferably located partially overlapping one above the other.

Between these laser-sensitive layers, an opaque laser-radiation layer 3 is arranged on a part of the area. This optical barrier layer 3 is a reflective layer, in a preferred embodiment a diffusely reflective layer. It preferably contains a sufficient proportion of white pigment and thereby prevents the spread of laser radiation in the layers below it. This is a prerequisite for the configuration of various laser-personalized layers according to the invention. A layer 1 that is personalized in a multi-color manner using laser radiation and separated by an optical locking layer can be located above layer 2 that is personalized in a monochrome manner using laser radiation, and in the case of multi-color personalization, inadvertent carbonation does not occur in the layer 2 below, which is monochromely laser-personalized.

The optical barrier layer can be created in various ways as an additional layer. Preferably, the optical barrier layer is applied by decorative printing to one of the covering layers.

The described multilayer storage medium can be manufactured in one of the following ways:

A method of injection molding, preferably multicomponent molding or modification directly in the mold,

Lamination of film composite material,

Lamination of mixed structures, preferably from paper and plastic films,

Applying layers to paper or plastic substrates,

Drawing a printed pattern on a substrate of paper or plastic,

The process of transferring film to substrates of paper or plastic

or a combination of these methods.

Figure 1 presents the preferred structure of the data carrier.

An optical locking layer can also be placed on top of the laser-sensitive layers and thereby provide coating on a part of the surface of the laser-sensitive layers. Preferably, this optical locking layer is made by decorative printing, preferably in the form of guilloche (mechanical engraving of wavy interlacing lines). The decorative print image information will then, after laser personalization, be transferred to the laser personalized layers to such an extent that here the laser personalized image information is interrupted by the image information of the optical locking layer.

Since the graphic element generated by color laser personalization in the sense of a color image is presented as part of a document, protection against fakes should be provided. The danger of fakes arises due to the fact that the color image is allocated from the document and can be replaced by another. Higher protection against fakes is provided by the fact that the graphic elements of laser personalization associate a color image with other elements of the document in the sense of a photo-integrated background.

Integration of various features: color laser personalization and laser personalization in grayscale in one data carrier is carried out in such a way that the various layers personalized with laser radiation are only part of the area placed one above the other. This provides various possibilities of integrated color laser personalization.

6 shows the possibilities of laser marking on the preferred structure of the data carrier.

If laser personalization is carried out in the area where only layer 2 personalized with a laser is located in a monochrome manner, then a monochrome black marking 9 is formed.

If laser personalization is carried out in the area where only layer 1 personalized with a laser in a multi-color manner is located above layer 3 opaque to laser radiation and layer 2 above a laser-personalized in a monochrome manner, then a multi-color marking 8 is formed.

If laser personalization is carried out in the area where only layer 2 personalized with a multicolor image is located, not separated by an optical locking layer 3, a superposition of multicolor marking 9 and monochrome black marking 8 is formed. This marking is also multicolor, however, based on mutually inverse bleaching and blackening effects, it appears darker than pure multi-color marking.

7 shows how integrated image elements can be realized by combining laser color personalization with classical laser processing to produce gray gradation. The absorption of the layers obtained by laser personalization is set here in such a way that the laser power required for bleaching is sufficient to carry out carbonization in the layer additionally used in the document, personalized with a laser in a monochrome manner. If layer 2, personalized with a laser in a monochrome manner, is located under layer 1, personalized with a laser in a multicolor way, and covered only partially in area by an optical locking layer 3, then this structure ensures that image elements, such as lines or alphanumeric digital symbols, which, without being limited by the optical barrier layer 3, have undergone laser processing, contribute to background carbonization. In this way, solid image elements can be formed with a change in the type of marking inside the element. If the restriction of the optical locking layer 3 coincides with the restriction of the layer 1, personalized with a laser in a multicolor manner, then a change from multicolor to non-color occurs. Such continuous image information acts in an integrated manner.

In addition, integrating image elements are possible, which are realized through a combination of laser color personalization with other graphic elements. The transparency of a layer personalized with a laser in a multicolor manner increases with increasing bleaching. This makes it possible that contour elements, for example guilloche lines, which are printed on layers below a layer personalized by a laser in a multi-color manner, for example on core material, appear after color laser processing in a color image. Thus, image elements, such as printed lines, which are only partially covered by a layer 1, personalized with a laser in a multicolor manner, after color laser personalization appear as integrating elements. Integrating elements, such as those that go beyond the edge of personalized features, make it difficult to fake a data carrier to a large extent.

Another feature of the invention is that the additional layer provides the ability to purposefully set the brightness of the background, regardless of the material used media. For example, by using an optical brightener or using pigment additives, an additional effect can be obtained.

From the foregoing, it follows that the essence of the invention lies in a multilayer data carrier that contains at least two different laser-sensitive layers, one laser-sensitive layer can be personalized using a laser in a multicolor manner, and the other laser-sensitive The radiation layer can be personalized using a laser in a monochrome manner. These laser-sensitive layers are arranged one above the other with partial overlap in area, preferably a laser-personalized layer in a multicolor manner is located above the laser-personalized layer in a monochrome manner. Sensitive to laser radiation layers can be made in such a way that at one stage of laser marking with a single wavelength and laser radiation energy, corresponding marking can be realized both in a layer personalized with a laser in a multicolor manner and in a layer personalized with a laser in a monochrome way.

Preferably, a layer opaque to the laser radiation is arranged at least partially overlapping in area between these laser-sensitive layers.

Preferably, the layer opaque to laser radiation is a reflective layer, which in a preferred embodiment can be a diffuse reflective layer and contains a sufficient proportion of impurity material that reflects or scatters the laser radiation.

Laser personalization can be carried out in the upper layer personalized by a laser, preferably in a layer personalized with a laser in a multicolor manner, without causing the laser radiation to change the layer located under this layer, personalized with a laser, and laser personalization is carried out in areas where the layers are sensitive to laser radiation optically separated from each other by an opaque layer for laser radiation.

Laser personalization can be carried out using laser radiation both in the upper layer personalized by a laser, preferably in a layer personalized with a laser in a multicolor manner, and in the layer located under this layer, a personalized laser, and laser personalization is carried out in areas where layers sensitive to laser radiation are not optically separated from each other by an opaque layer for laser radiation.

Laser personalization can be carried out using laser radiation both in the upper laser-personalized layer, preferably in the laser-personalized layer, and in the laser-personalized layer located below this layer, the laser personalization being carried out in such a way that the graphic elements of the image are arranged on areas that extend beyond the corresponding laser personalized layer, preferably a multi-color laser personalized layer nym manner so that the picture elements within the transition occurs from the color image to a monochrome image.

Laser personalization can be carried out using laser radiation in a laser-personalized layer so that the graphic elements of the image are located above the parts of the optical locking layer located above the laser-personalized layer, so that interruption of the graphic elements thus formed is realized inside the laser-personalized layer. As interrupting elements in the sense of an optical locking layer, printing elements, such as, for example, guilloche lines located above a laser-personalized layer, can preferably be used.

Laser personalization can be carried out using laser radiation in a layer personalized with a laser in a multicolor manner, so that graphic elements, preferably printed elements, for example, guilloche lines, which are printed on layers under a layer personalized with a laser in a multicolor manner, for example, on a carrier material, after laser processing to impart colors, they appear in a color image due to the transparency of the layer, personalization direct multi-color with a laser, in the laser marking process is increased.

A significant advantage of the invention is that the well-known gray-scale laser personalization is combined with the new color laser personalization method. The reliability of documents due to the combination carried out in the described manner is significantly increased.

Claims (17)

1. A multilayer body made in the form of a multilayer film, preferably a transfer film or a layered film, or in the form of a layered composite material of at least one covering film and an input element, with a first layer of a laser-sensitive material, hereinafter referred to as the first a laser-sensitive layer, and with a second layer of a laser-sensitive layer, hereinafter referred to as a second laser-sensitive layer, which are located at least in part it is provided that the laser-sensitive material of the first laser-sensitive layer contains a dye which, under the influence of laser radiation, becomes colorless or under the action of laser radiation changes its color due to color conversion, and the laser-sensitive material of the second laser-sensitive the radiation of the layer contains a dye that, under the influence of laser radiation, becomes colorless or under the influence of laser radiation changes its color due to color conversion, or the laser-sensitive material of the second laser-sensitive layer contains doped material, which undergoes blackening under the influence of laser radiation, and, moreover, it is provided that it is possible to form a complex composite laser-induced multilayer image due to , what: a) a multilayer laser-induced image component may be formed in the first laser-sensitive layer, and a black marking may be formed in the second laser-sensitive layer, preferably a grayscale image, and / or b) a special background layer, at least in areas, is arranged as an intermediate layer between the laser-sensitive layers and acts as a barrier layer that is not transparent to the laser radiation, which is used to form the laser-induced marking in the laser-sensitive layer. 2. The multilayer body according to claim 1, characterized in that on the side facing the substrate of at least one of the layers sensitive to laser radiation, a background layer is placed in at least one partial region, which is reflective for the used laser radiation , and / or opaque, or substantially opaque, and / or absorbent. 3. The multilayer body according to claim 2, characterized in that the background layer is located between the first laser-sensitive layer and the second laser-sensitive layer. 4. A multilayer body according to claim 2 or 3, characterized in that the background layer is transparent to light in the visible spectral range and / or to laser radiation only under certain conditions for the laser, in particular only for a certain range of wavelengths and / or angles irradiation, is transparent or opaque, preferably for laser radiation, which is used to form a laser-induced marking in the laser-sensitive layer, is transparent or opaque. 5. The multilayer body according to claim 1, characterized in that the laser-sensitive material of the first laser-sensitive layer differs from the laser-sensitive material of the second laser-sensitive layer, preferably in that the specific laser processing conditions of both materials are different. 6. A multilayer body according to any one of claims 1 to 3 and 5, characterized in that the laser-sensitive dye is made as a mixture of at least two, preferably three, laser-sensitive dye components, for each of these of two or three laser-sensitive dye components, it is ensured that under certain laser conditions for one dye component, the remaining dye components do not change or do not substantially change, preferably bleach. 7. The multilayer body according to claim 6, characterized in that the mixture contains two or three of the following dye components: blue dye, purple dye, yellow dye. 8. A multilayer body according to any one of claims 1 to 3, 5 and 7, characterized in that the doped material, which when exposed to laser radiation is blackened, is a material with an admixture of carbon and / or soot. 9. A method of forming a multilayer image in a multilayer body predominantly according to one of the preceding paragraphs, wherein the multilayer image is composed of several laser-induced image components, in which the first laser-induced image component is formed under the influence of laser radiation under the first conditions for the laser in the first sensitive to laser radiation layer of a multilayer body, the first layer being marked with a laser in a multicolor manner, the second induced the laser component of the image is formed under the influence of laser radiation under the second laser conditions in the second laser-sensitive layer of the multilayer body, the second layer being laser-marked in black monochrome and the first and second laser-sensitive layers are partially overlapped in area and between the layers that are sensitive to laser radiation is not transparent to laser radiation layer. 10. The method according to claim 9, characterized in that in the area in which there is only a second laser-sensitive layer, a monochrome marking is formed in black and / or in the area in which the first laser-sensitive layer is located above the non-transparent for laser radiation, a layer and above the second laser-sensitive layer, a multi-color marking is formed. 11. The method according to claim 9, characterized in that the first conditions for the laser and the second conditions for the laser differ, preferably with respect to the laser wavelength and / or radiation power and / or the angle of incidence of the radiation. 12. The method according to claim 9, characterized in that the first laser-induced image component and the second laser-induced image component are formed with a time offset relative to each other or simultaneously. 13. The method according to any one of claims 9 to 12, characterized in that the laser-induced component of the image is created on one section of the laser-sensitive layer, which is located above the background layer, which is reflective for the used laser radiation and / or for the non-reflected laser radiation is opaque and / or absorbing. 14. The method according to any one of claims 9 to 12, characterized in that the laser-induced component of the image is formed by laser-induced discoloration or laser-induced color conversion as a multicolor image, preferably a full color image. 15. The method according to any one of claims 9 to 12, characterized in that the laser-induced component is performed by laser-induced blackening, preferably as a grayscale image. 16. The method according to any one of claims 9 to 12, characterized in that the laser-sensitive material is made as a mixture of at least two, preferably three, laser-sensitive components of the dyes, each of two or three the component of the dyes by means of a laser, respectively, under the conditions determined for the component for the laser, is variable, preferably bleached, moreover, for each of the three components of the dye, it is satisfied that under the conditions determined for one component of the dye For the laser, the other or both other components of the dyes do not fade or essentially do not fade. 17. The method according to clause 16, wherein the dye mixture consists of two or three of the following dye components: cyan dye, magenta dye, yellow dye, and it is preferably provided that red laser radiation is used to bleach the blue dye, which is to bleach the magenta the dye uses green laser radiation and the blue laser is used to bleach the yellow dye.

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