JP4018632B2 - Multilayer body comprising a first laser-sensitive layer and a second laser-sensitive layer, and a method for producing a multilayer image on such a multilayer body - Google Patents

Abstract

A multilayer body is disclosed, comprising two laser-sensitive layers (4, 32). Said multilayer body is a laminated body of overlay films (30, 32), inlays (90, 90) and further overlay films (30,30). The upper overlay film (30) comprises a layer structure applied to the underside thereof by application of a hot-stamp film. The layer structure comprises a lacquer layer (50), a reflection layer (5r), a laser-sensitive layer (4), a background layer (5) and an adhesive layer (6). A diffraction and/or hologram structure (5b) is embodied in the lacquer layer (5c), the reflection layer (5r) and the laser-sensitive layer (4). The second laser-sensitive layer is embodied as a carbon-doped overlay film (32). A laser-induced, preferably coloured image component can be generated in the upper laser-sensitive layer (4) and a further, preferably grey-scale image generated in the carbon-doped laser-sensitive layer (32) thereunder by means of laser treatment. A laser-induced multilayer image can thus be produced.

Description

  The invention has the form of a multilayer film, preferably a transfer film or a laminate film, or a layered composite comprising at least one overlay film and preferably an inlet, and a multilayer comprising a laser-sensitive layer About the body. The invention also relates to a method for producing a multilayer image on such a multilayer body.

  Objects containing laser sensitive materials are known. For example, Patent Document 1 discloses variously shaped plastic bodies each containing a mixture of various pigments, specifically having a solid or coating form. Color marking is applied to the plastic or coating by laser treatment.

  Patent Document 2 describes a method of processing using special yellow, magenta, and cyan pigments that are activated by ultraviolet light in the first step and are only subjected to decolorization in the subsequent second step. Yes.

  Patent Document 3 also creates a color mark by laser treatment that selectively decolorizes these pigments with red laser light, green laser light, and blue laser light when using a mixture of a cyan pigment, a magenta pigment, and a yellow pigment. The method of doing is disclosed. This method is described with respect to using a plastic made from a material containing the pigment mixture.

  It is also known from US Pat. No. 6,057,049 to form multicolor marks on plastic bodies that contain pigment mixtures and can take the form of solids or coatings by laser treatment using different wavelengths. The coloring action is caused by pigments that change color due to discoloration in laser processing. Patent Document 5 discloses a method in which the dye A having a laser sensitivity and the dye B having no laser sensitivity are contained in separate layers or common layers superimposed on each other, and the dye A is decolorized by laser treatment. . Thus, the color marking provided by this laser treatment is only the color marking with the color change of dye A, so that only a maximum of two color images can be obtained.

  Patent Document 6 describes a plastic layer in the form of a coating on a metal plate, or when a plastic plate is subjected to laser treatment, specifically by changing or blackening from one color to another. Disclosed is a method that includes an additive intended to change color.

  Patent Document 7 discloses a laser marking method used for surface pigment coating, in which a plurality of pigments in a pigment coating change their internal molecular structure at different temperatures to exhibit different colors. A color laser mark can be obtained by locally achieving a specific surface temperature by the laser irradiation effect.

  Patent Document 8 also discloses laser engraving of an ID card. Here, laser engraving is performed by removing the various color layers. The laser mark obtained in this case appears in the form of a color mark.

  Patent Document 9 describes laser marking on a multilayer film having a metal layer and a hologram structure. This marking method is carried out by locally destroying the metal layer carrying the hologram.

  Patent Document 10 discloses a hot stamp film provided with a hologram structure that is individualized by laser processing for the purpose of counterfeiting. The change in material or color or the removal of part of the layer structure of the film is carried out with a laser beam.

Patent Document 11 describes a special method for laser engraving on an ID card. In this method, black marks are formed on various transparent layers of the ID card by a laser. In this way, a parallax image is formed on transparent layers that cooperate with each other.
International Publication No. 96/35585 Pamphlet International Publication No. 98/11986 Pamphlet German Patent Invention No. 1995955338 WO94 / 12352 pamphlet European Patent No. 0327508 European Patent No. 0190997 German Patent Application Publication No. 3738330 British Patent Application No. 2240948 German Patent Application No. 4131964 European Patent No. 0420261 European Patent No. 0219011

  The object of the present invention is to provide a multilayer body that ensures a particularly high level of security against counterfeiting, and in particular a laser-induced (hereinafter “laser-induced”) mark that can be created by laser treatment. That is. Another object of the present invention is to provide a method for creating new and complex laser-induced marks.

  The present invention achieves the above object by a multilayer body as defined in claim 1 and a method for creating a laser-induced multilayer image in such a multilayer body as claimed in claim 9 of the method. .

  The multilayer body has a first laser-sensitive layer and a second laser-sensitive layer, and laser-induced imaging components having different shapes can be created in the first and second laser-sensitive layers. The possibility of forming a triggered multilayer image is provided. A laser-sensitive layer with a laser-sensitive colorant can take the form of a multicolor image or a full-color image if an appropriate laser-sensitive mixed colorant containing 2-3 decolorizable colorant components is used. You can create colorful laser-induced image components that you can. On the other laser-sensitive layer, another laser-sensitive material that can produce another color mark, preferably a multicolored image or a black mark (preferably a grayscale image), by laser treatment, i.e. another mixed colorant or carbon. Alternatively, a black doped material can be used.

  It is practically preferred that the various laser-sensitive layers can be arranged only in a locally overlapping relationship, and in some cases it can also be virtually transparent only locally. By applying specific laser processing controls to each of the various laser-sensitive layers, a variety of specific image components can be created by the laser-induced process that can cooperate to form any complex multilayer image.

  In addition to multiple laser-sensitive layers in a layered structure, diffractive and / or holographic structures that provide different optical effects in different visions are provided, providing different visual effects with different laser-induced imaging components arranged in different layers Then, a multilayer image having a particularly attractive optical effect can be obtained.

  Preferred embodiments are described in detail below with reference to the accompanying drawings.

  In order to be able to create the desired laser-triggered marks as selectively as possible on the individual laser-sensitive layers during laser irradiation, the laser-sensitive layers are subject to specific laser conditions, for example only at specific laser wavelengths or irradiation angles. Only it can exhibit photosensitivity. Also, for example, a special background layer that acts like a barrier layer for specific laser irradiation based on the laser wavelength, irradiation angle, and the like can be disposed as an intermediate layer between both laser photosensitive layers. In a preferred embodiment, the background layer acting as a barrier layer is only locally, i.e. only under a part of the laser-sensitive layer located above, preferably in the region under the laser-induced mark. May be provided only. It is also possible to achieve special special effects by arranging such barriers and intermediate layers only locally. Specifically, at the time of laser irradiation, for example, it is possible to create a laser-induced mark only in the region of the upper laser photosensitive layer that includes the intermediate layer, and in the region that does not include the intermediate layer, they overlap each other. Different laser-induced marks are obtained in the form of composite marks of both laser-sensitive layers, and the two layers of the laser-sensitive material are different, so that, for example, a color mark is created on one layer and a black color on the other layer. A particularly attractive optical effect is achieved when a mark, preferably a grayscale image, is created.

  The hot stamping film shown in FIG. 1 is a multilayer body in which two laser photosensitive layers 4 are provided on both sides of a reflective layer 5r. By laser processing of this multilayer body, different laser-induced marks can be produced in both laser-sensitive layers, thereby forming a composite laser-induced multilayer image. The same applies to the laminate film shown in FIG. 2 whose layer structure corresponds to the transfer film of FIG. The same applies to the hot stamping film shown in FIG. 3, which has a modified layer structure but also has two laser-sensitive layers 4 and 4a. The laminate shown in FIG. 4 also has two laser-sensitive layers, namely a layer 4 disposed underneath and attached to the upper overlay film 30 of the hot stamping film, and a separate dope. A layer 32 having the form of a overlay film.

  In the following, the structure of the individual multilayer bodies will be described in detail with reference to the drawings, as well as the laser processing capable of creating a laser-induced image component in the form of a full-color image. A method for creating a grayscale image in the form of a laser-triggered image component for another laser-sensitive layer is also described.

The film shown in FIG. 1 includes a carrier layer 1, a release layer 2, a protective layer 3, a laser photosensitive layer 4, a reflective layer 5r, a laser photosensitive layer 4, an additional lacquer layer 7, and an adhesive layer 6 in this order. Is present. The laser photosensitive layers 4 provided on both sides of the reflective layer 5r can be exactly the same, that is, at this time, the reflective layer is disposed over the entire laser photosensitive layer. However, the two laser photosensitive layers may be different from each other. A diffractive structure 5b is provided in a region where both the laser photosensitive layer 4 and the reflective layer 5r are adjacent to each other. Alternatively, the diffractive structure 5b can be in the form of a hologram structure. In the embodiment shown, the anti-counterfeiting level is enhanced by the two laser-sensitive layers being adjacent to the diffractive or holographic structure. The laser photosensitive layers can be the same or different. In this case, the lacquer layer 7 has the form of a transparent layer or a light auxiliary layer. Alternatively, the lacquer layer 7 and the adhesive layer 6 can be omitted, or the second laser photosensitive layer 4 shown below the reflective layer 5r in FIG. 1 can have the form of a laser sensitive adhesive layer.

  FIG. 2 shows an embodiment of a laminate film having a series of layers corresponding to the structure of a hot stamping film. The laminate film includes a so-called overlay film 30, a laser photosensitive layer 40, an optional intermediate layer 50 that forms a background layer, and an optional adhesive layer 60. Similarly to the laser photosensitive layer 4, the laser photosensitive layer 40 is disposed on both sides of the reflective layer 50r. However, in this regard, as in FIG. 1, the two laser photosensitive layers are the same or different. As in the case of the hot stamp film of FIG. 1, in the case of the laminate film of FIG. 2, the diffraction and / or hologram structure 50b is specifically formed in the region of the two laser photosensitive layers 40 and the reflective layer 50r therebetween. Is provided.

  During laser processing of the hot stamping film of FIG. 1 or the laminate film of FIG. 2, respective laser-induced image components are created in the laser-sensitive layers superimposed on each other, and these image components are in different layers. The laser treatment is preferably performed after the corresponding film is attached to the support, and as long as the film attached to the support is irradiated from the outside. Or it is also possible to give a laser process to the film before adhesion. Therefore, in this case, laser irradiation can be performed from both sides of the film.

  If the laser-sensitive layers have different laser-sensitive materials, and therefore laser-induced imaging components can be created on different laser-sensitive layers under different material-specific laser conditions, separate laser-induced layers within the laser-sensitive layers superimposed on each other An image component is obtained. Alternatively, it is possible to process only the upper or lower laser photosensitive layer by changing the irradiation angle. This possibility is realized by the fact that the reflective layer 5r exhibits transparency when irradiated at a right angle to the laser beam, but does not exhibit transparency when irradiated at an acute angle, or is less transmissive. Differences also occur in the transmitted radiation that passes through the diffractive structure. Therefore, by appropriately adjusting the irradiation angle of the laser beam, the processing of the upper laser photosensitive layer to create a specific laser-induced image component can be performed without the laser beam passing through the lower laser photosensitive layer. . Therefore, even if the laser photosensitive layers are made of the same laser photosensitive material, it is possible to process the layers superimposed on each other separately.

  The embodiment of the hot stamping film of FIG. 3 also has two laser photosensitive layers 4 and 4a. However, both layers are separated from each other by an intervening background layer 5. The background layer is a layer that highly reflects the laser beam used for laser processing. In addition, the background layer is non-transmissive and absorbable with respect to the non-reflective component of the laser beam. Therefore, during the laser processing for creating the laser-induced mark on the upper laser photosensitive layer 4, the underlying laser photosensitive layer 4a The laser beam does not pass. The background layer 5 is arranged only under the laser-sensitive layer 4 in areas where laser-induced image components are created in the laser-sensitive layer 4. The background layer 5 is not formed in the outer region, that is, the background layer is disposed in a region of a material that is transparent to a laser beam, preferably a laser photosensitive material of the lower laser photosensitive layer 4a. Accordingly, in those areas where the background layer is not formed, a laser-induced image component can be formed in the lower laser-sensitive layer 4a by the laser beam.

  The two laser photosensitive layers 4 and 4a are preferably made of different laser photosensitive materials to which different material-specific laser processing conditions are applied. Thus, it is possible not to cause the laser-induced change in the upper laser sensitivity 4 at the same time that the laser-induced mark is formed in the lower laser photosensitive layer 4a.

  In order to prevent the laser light from entering the support, another background layer 5a is disposed below the lower laser photosensitive layer 4a. This background layer 5a prevents the laser beam from reaching the support during the laser treatment.

  The embodiment of FIG. 4 is an object bonded from various overlay films and inlets. The upper overlay film has a layer structure including a lacquer layer 5 c, a reflective layer 5 r, a laser photosensitive layer 4, a background layer 5, and an adhesive layer 6 on the lower side. A diffractive and / or hologram structure 5b is formed in the lacquer layer 5c, the reflective layer 5r, and the laser photosensitive layer 4.

These layers that are deposited on the underside of the overlay film 30 are layers of hot stamping films that are deposited on the underside of the overlay film. The doped overlay film 32 disposed below the overlay film 30 has the form of a laser photosensitive film. Therefore, a second laser photosensitive layer is formed. In the illustrated embodiment, the laser sensitive material has the form of a carbon and / or black doped material. This is a material that carbonizes under the action of a laser, thus creating a laser-triggered image component by blackening within this layer formed by the doped overlay film 32. Grayscale images can be created by changing laser conditions, such as changing laser power and / or laser wavelength.

  The inlet 90 is disposed below the doped overlay film 32, and another inlet 90 is disposed below the inlet 90. These inlets can preferably be formed from paper or plastic materials, preferably in the form of inlet films. An overlay film 30 is disposed below the lower inlet 90, and another overlay film 30 is disposed on the surface thereof.

  Laser processing for creating different laser-triggered image components in the laser-sensitive layers 4 and 32 is applied to the embodiments corresponding to FIGS.

  A method by which a full-color image component can be formed by laser-induced decolorization on a laser-sensitive layer containing a mixed colorant composed of three kinds of laser-sensitive colorant components is also described in detail below. The laser photosensitive material is a three-component mixture containing a cyan pigment, a magenta pigment, and a yellow pigment.

  In the decoloring operation, in the first stage, a blue, green or red color mark is created by irradiating a target location with a specific laser wavelength at which a specific pigment component is decolorized.

  Only the yellow pigment component may be decolorized to produce a blue color. Blue laser light is used for this purpose. The decolorization procedure requires a certain minimum laser intensity. Also, it should not exceed a certain pulse width. Only the magenta pigment component may be decolorized to obtain a green color mark in the first stage. Green laser light is used for this purpose. In order to obtain a red mark in the first stage, only the cyan pigment component may be decolorized. Red laser light is used for this purpose.

  In order to create a cyan or magenta or yellow color mark at this position, in the second stage, specifically using a laser wavelength that decolorizes the unbleached pigment component at this position, Laser treatment is performed at this position. When a blue color mark is created in the first stage, the cyan pigment component and the magenta pigment component at this position are not decolorized. In order to produce a cyan color at this position, it is necessary to decolor the magenta pigment component in this second stage. This is done with green laser light. As a result, a cyan mark is created at this position.

  In this second stage, if it is desired to obtain a magenta mark instead of a cyan mark, the blue color mark created in the first stage must be processed with red laser light.

  That is, since the cyan pigment at this position is decolored, the magenta pigment at this position remains without being decolorized. As a result, a magenta mark is created at this position.

  Similarly, the cyan mark or the yellow mark is specifically treated with a blue laser beam and a red laser beam, respectively. It can be created from a green color mark composed of pigment.

  Similarly, the red color mark created in the first stage can be converted into a yellow or magenta mark in the second stage. Specifically, it is converted by laser processing in the second stage using green laser light and blue laser light.

  In order to obtain a transparent place in the position treated in the first and second stages, ie to obtain a white place if the background layer 5 is white, it remains in place without being decolorized after the second stage. It is necessary to process this position in the third stage using a laser beam whose wavelength is set to decolorize the pigment component. That is, it is necessary to decolor the yellow mark with blue laser light, the magenta mark with green laser light, and the cyan mark with red laser light.

  Next, in order to create another color mark on the laser photosensitive layer 4 of the stamp film, the same processing is performed on another adjacent place in the laser photosensitive layer 4. In this way, a full color image can be created.

  Laser treatment can also be used to create color marks or full color images on the colorant of the laser sensitive layer by discoloration. Laser treatment can be carried out in the same way by continuous processing steps. The pigment is involved as a colorant, ie a substance that imparts color. Pigments are generally insoluble and are usually inorganic substances. However, generally soluble organic colorants can also be used as colorants. Discoloration occurs in each case with specific laser conditions applied at each stage of the laser treatment.

  The above-described decolorization and color conversion methods can be used similarly when the laser photosensitive material contains only one or two kinds of colorant components. Other colorant components, other laser conditions in laser processing, and in particular, other laser wavelength ranges can be used.

  Laser treatment is generally performed when the film is attached to the support. However, as another option, in particular, whether the protective layer 3 or any other layer, for example the background layer 5, for example, has the form of a layer that is not transparent or only translucent to the laser beam, Alternatively, if the layer is not transparent to the laser beam in a specific wavelength range, or if an additional UV-absorbing protective layer is provided, the laser is applied before the film is attached by applying a film irradiation procedure. It is also possible to carry out the processing. The laser treatment is then carried out, preferably before the film is deposited, by means of a laser beam directed to the back side of the film, ie the background layer 5 or the adhesive layer 6. Accordingly, in order to form a color mark therein, the laser photosensitive layer 4 is subjected to the same processing from the opposite side. The background layer 5 and the adhesive layer 6 used in this way are transparent to the laser radiation or at least translucent.

  The configuration of the layers used in the specific embodiment is as follows.

Release layer (separation layer )
Toluene 99.5 parts Ester wax (Drip point 90 ° C) 0.5 parts
Protective layer 3 (Protective lacquer layer)
Methyl ethyl ketone 61.0 parts Diacetone alcohol 9.0 parts Methyl methacrylate (Tg: 122 ° C) 18.0 parts Polyethylene dispersant (23% in xylene) (softening point 140 ° C) 7.5 parts Polymer dispersion additive ( 40%, amino number 20) 0.5 parts extender (aluminum silicate) 4.0 parts
Laser photosensitive layer 4 (first color lacquer layer):
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 Polymer dispersing additive ( 40%, amino number 20) 2.0 parts Example: Pigment Blue 15: 4 0.5 part Pigment Red 57: 1 0.5 part Pigment Yellow 155 0.5 part
Background layer 5 (second color lacquer layer)
Methyl ethyl ketone 40.0 parts Toluene 22.0 parts Ethylene vinyl acetate terpolymer (Fp = 60 ° C.) 2.5 parts Polyvinyl chloride (Tg: 89 ° C.) 5.5 parts Polyvinyl chloride (Tg: 40 ° C.) 3.0 Part dispersion additive (50%, acid value 51) 1.0 part titanium dioxide (d = 3.8-4.2 g / cm ³ ) 26.0 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 methacrylate resin (Tg: 63 parts) 3.0 parts methacrylate copolymer (Tg: 80 ° C.) 5.0 parts unsaturated polyester resin (softening point 103 ° C.) 3.5 parts silicon dioxide 3.5 parts Finally, referring to FIGS. The subject matter of the present invention will now be briefly described in relation to its essential features and functions.

Preferably, at least two different laser-sensitive layers, one multi-color laser personalizable layer (laser-sensitive layer) 41 is multi-color laser-personalizable, another monochrome laser personalizable layer ( laser A multilayer data carrier is provided in which it is preferred that the photosensitive layer 42 be monochrome laser personalizable.

  For this purpose, the laser-sensitive material can be adjusted so that marks are made on both materials at a defined wavelength and intensity.

  Both laser-sensitive layers are arranged in such a relationship that a part of their areas overlap each other.

An optical barrier layer ( opaque layer) 3r with respect to the laser beam is disposed in a part of the above-mentioned area between these laser-sensitive layers. This optical barrier layer 3r is a reflective layer, and in a preferred configuration is a diffuse reflective layer. The barrier layer preferably contains a white pigment in an appropriate proportion so that laser light is not incident on adjacent layers. This is also essential for the separate arrangement of the laser personalizable layer according to the invention. A multicolor laser personalizable layer 41, which is multicolor laser personalizable , is arranged on a monochrome laser personalizable layer 42 , which can be monochromatic laser personalized , separated by an optical barrier layer. This can prevent unintentional carbonization of the monochrome laser personalizable layer 42, which can be laser personalized in a monochrome fashion.

  The optical barrier layer can be incorporated in various ways as an additional layer. In a decorative printing procedure, it is preferred to attach an optical barrier layer to one of the cover layers.

  The aforementioned multi-layer data carrier can be created according to one of the following methods.

Injection molding method, preferably multi-part injection molding or in-mold decoration,
Bonding film composites,
Bonding of hybrid structures, preferably paper and plastic films,
Coated paper carrier or plastic carrier,
Printing on paper carrier or plastic carrier surface,
Film transfer process for paper carrier or plastic carrier,
Combination of the above methods.

  FIG. 1 shows a preferred structure of the data carrier.

  An optical barrier layer may be disposed above the laser photosensitive layer, thus covering the relevant portion of the area of the laser photosensitive layer. Therefore, the optical barrier layer preferably has a decorative print form, and preferably has a line pattern form such as a knitted rope pattern. The decorative print image information is then transferred to the laser personalizable layer after the laser personalization operation, to the extent that the optical barrier layer image information obstructs the laser personalization image information.

  Since graphic elements generated by color laser personalization work are displayed as part of the document, they must defend against counterfeiting in terms of color images. If the color image can be separated from the document and replaced with another, there is a risk of counterfeiting. With a laser personalization effect graphic element, you can enjoy a high degree of protection against counterfeiting by combining a color image with other elements of the document in the sense of a photo-embedded background.

  The integration of different features within the data carrier, namely color laser personalization and grayscale laser laser personalization, results in the relationship that different laser personalizable layers are superimposed on each other only in relation to their area. This is done in the form of arrangement. This provides a variety of possible options for integrated color laser personalization.

  FIG. 6 shows a possible option of forming a laser mark on the preferred structure of the data carrier.

When laser personalization is performed at a location where there is only the monochrome laser personalizable layer 42 , a monochrome black mark 9 is created.

When laser personalization is performed at a position where the multicolor laser personalizable layer 41 is disposed on the optical barrier layer 3r opaque to the laser beam and the monochrome laser personalizable layer 42 , a multicolor mark is formed. 8 is created.

When laser personalization is performed at a position where only the multicolor laser personalizable layer 41 is disposed on the monochrome laser personalizable layer 42 without being separated by the optical barrier layer 3r , the multicolor mark 8 And a monochrome black mark 9 are created. This mark is also multicolored due to the reciprocal effect of decolorization and blackening, but in that case it appears darker than a pure multicolor mark.

FIG. 7 illustrates how image elements can be integrated by combining color laser personalization with conventional gray scale laser processing. For this purpose, the absorption of the laser personalizable layer is adjusted so that the laser power required for the bleaching procedure is sufficient for carbonization of the monochrome laser personalizable layer used additionally in the document. There monochrome laser personalization allows layer 42 is below the multicolor laser personalization possible layer 1, if a portion of the area is covered by optical barrier layer 3r, this structure, the boundary of the optical barrier layer 3r Image elements, such as lines or alphanumeric characters, that are lasered beyond, can be carbonized in the background. In this way, continuous image elements can be created while changing the nature of the marks in the elements. If the boundary of the optical barrier layer 3r coincides with the boundary of the multicolor laser personalizable layer 41 , the color changes from colorful to non-colorful. These successive items of image information have an integration effect.

  The integration of image elements achieved by combining color laser personalization with other graphic elements is also possible. The transparency of a multicolor laser personalizable layer increases as decolorization increases. Thereby, for example, layout elements such as a knitted rope pattern printed on a layer directly below the multicolor laser personalizable layer, for example on a color material, are displayed after the color laser operation of the color image. Thus, for example, an image element such as a printed line, in which only the relevant part of its area is covered by the multicolor laser personalization layer 1, is displayed as an integrated element after the color laser personalization operation. With such an integrated element extending to the edge of the personalized configuration, forgery of the data carrier becomes more difficult.

  Another feature of the present invention is that the additional layer allows the brightness of the background to be adjusted clearly and as desired regardless of the carrier material used. Thus, for example, additional effects can be achieved by using optical brighteners or by using pigment additives.

  In view of the above, the subject of the present invention comprises at least two laser-sensitive layers, wherein one laser-sensitive layer is multicolor laser personalizable and the other laser-personalizable layer is monochrome laser personalizable. This is a multi-layer data carrier. These laser-sensitive layers are preferably such that their area-related portions are superimposed on each other and the multicolor laser personalizable layer is located above the monochrome laser personalizable layer. The laser-sensitive layer can also allow each marking to be achieved on both the multicolor laser personalizable layer and the monochrome laser personalizable layer in a laser marking process using the same wavelength and the same laser beam energy. .

  It is preferable that a layer that is opaque to the laser beam is disposed at least in the relevant portion of the area between the laser-sensitive layers.

  The layer opaque to the laser beam is a diffuse reflection layer in a preferred embodiment, and is a reflective layer containing an appropriate proportion of an additive that reflects or scatters the laser light.

  If the laser-sensitive layer is optically separated from each other by a layer that is opaque to the laser beam, the upper laser personalizable layer, preferably without changing the laser personalizable layer directly below it, preferably Laser personalization can be applied to multicolor laser personalizable layers.

Also, if the laser sensitive layer is not optically separated from each other by a layer that is opaque to the laser beam, an upper laser personalizable layer, preferably a multicolor laser personalizable layer, and Laser personalization can be applied to both of the laser personalizable layers directly below the layer and the graphic image element extends beyond the surface portion of each laser personalizable layer, preferably a multicolor laser personalizable layer. When placed, the laser beam enables an upper laser personalizable layer, preferably a multicolor laser personalizable layer, and a laser personalization system directly under this layer. Both of the possible layers can be laser personalized, thus changing from a multicolor representation to a monochrome representation within the image element.

  A graphic image element is placed over the surface of the optical barrier layer located above the laser personalizable layer, so that the graphic image element thus created is interrupted in the laser personalizable layer. In some cases, laser personalization can be applied to the laser personalizable layer by a laser. An interrupting element in the sense of an optical barrier layer, preferably a printing element, for example a knitted rope pattern, can be arranged above the laser personalizable layer.

  Using laser beams, laser personalization can be applied to multicolor laser personalizable layers, so if the transparency of the multicolor laser personalizable layer is increased by the laser marking process, after the color laser irradiation operation Creative elements (preferably print elements such as knitted rope patterns) printed on the layer (eg carrier material) directly below the multicolor laser personalizable layer are displayed in color images.

  An essential advantage of the present invention is that the known gray scale laser personalization is combined with a new method of color laser personalization. By combining as described above, it is possible to substantially increase the security of the document.

It is sectional drawing of embodiment of the transfer film provided with two laser photosensitive layers. It is sectional drawing of embodiment of the laminate film provided with the structure corresponding to the transfer film of FIG. It is sectional drawing of another embodiment of the transfer film provided with the two laser photosensitive layers which changed the order of the layer. It is an exploded view of a laminate comprising a plurality of overlay films and inlets and also having two laser photosensitive layers. It is sectional drawing of another embodiment. It is sectional drawing of embodiment of FIG. 5 for demonstrating a laser process. 7 is a plan view of a laser-induced image of the embodiment of FIGS. 5 and 6. FIG.

Explanation of symbols

1 Carrier layer 2 Release layer 3 Protective layer 4 Laser photosensitive layer 4a Laser photosensitive layer 5 Background layer 5b Hologram structure / diffractive structure 5c Lacquer layer 5r Reflective layer 6 Adhesive layer 7 Lacquer layer 8 Multicolor mark 9 Black mark 30 Overlay film 32 dope Overlay film 40 Laser photosensitive layer 50b Hologram structure 50 Intermediate layer 50r Reflective layer 60 Adhesive layer 90 Inlet

Claims (31)

A multilayer body having the form of a multilayer film or a layered composite in which at least one overlay film and an inlet are bonded together, wherein the multilayer body is
A first laser-sensitive layer having a laser-sensitive material;
A second laser-sensitive layer having a laser-sensitive material,
The first and second laser-sensitive layers are arranged in a mutually overlapping relationship at least locally;
The laser-sensitive material of the first laser-sensitive layer has i) a colorant that can be decolored by the action of a laser beam, or ii) a colorant that changes its color by a color change by the action of a laser beam;
Wherein the laser-sensitive material of the second laser-sensitive layer, i) or can be decolorized colorant by the action of the laser beam, or, ii) or color by color change due to the action of the laser beam is formed by chromatic colorants that changes, Or
The laser-sensitive material of the second laser-sensitive layer, i) are those formed by perforated blackened capable doped material by the action of the laser beam;
Between the front Symbol first and second laser-sensitive layer, at least locally, to place the background layer as an intermediate layer, the background layer is used to form the laser-induced marking in the laser-sensitive layer laser acts as a barrier layer is not transparent to,
In the region where the intermediate layer is provided, a laser-induced mark is formed on the upper laser-sensitive layer, and in the region where the intermediate layer is not provided, different laser-induced signals that overlap the upper and lower laser-sensitive layers. A multilayer body characterized in that a laser-induced multilayer image that is configured in a complex manner to form the laser-induced image component is formed by forming a mark .   The multilayer body according to claim 1, wherein a multicolor laser-induced image component can be formed on the first laser-sensitive layer, and a black mark can be formed on the second laser-sensitive layer. The multilayer body according to claim 1 or 2 , wherein the multilayer film is a transfer film or a laminate film. Characterized in that the black mark is gray-scale image, the multilayer body according to claim 2 or 3. The background layer is i) transparent to light in the visible spectral range, ii) transparent or opaque to a specific laser wavelength range, iii) transparent or opaque to a laser beam satisfying a specific irradiation angle is characterized in that it satisfies at least one condition of iii) from i) of the multilayer body according to any one of claims 1-4. Another background layer having at least one of the following characteristics i) to iii): i) reflective, ii) opaque or substantially opaque, iii) light absorption, The multilayer body according to any one of claims 1 to 5 , wherein the multilayer body is disposed on at least a partial region of at least one of the two laser photosensitive layers on the side facing the support. The further background layer is i) transparent to light in the visible spectral range, ii) transparent or opaque to a specific laser wavelength range, iii) transparent to a laser beam satisfying a specific irradiation angle The multilayer body according to claim 6 , wherein at least one of the conditions i) to iii) of being opaque is satisfied. The multilayer body according to claim 7, wherein the another background layer is transparent or opaque to a laser beam used to form a laser-induced mark on the laser-sensitive layer. Claim 1-5 in which the laser processing conditions of the laser-sensitive material of the laser processing conditions and the second laser-sensitive layer of the laser-sensitive material of the first laser-sensitive layer, wherein the different 2. The multilayer body according to item 1. 9. The laser processing condition of the laser photosensitive material of the first laser photosensitive layer and the laser processing condition of the laser photosensitive material of the second laser photosensitive layer are different from each other. 2. The multilayer body according to item 1. The colorant has the form of a mixture of at least two laser sensitive colorant components;
Each of the at least two laser-sensitive colorant components is subject to the condition that other colorant components cannot or cannot substantially change under laser conditions for a certain colorant component. The multilayer body according to any one of claims 1 to 5 or 9 , wherein The colorant has the form of a mixture of at least two laser sensitive colorant components;
  Each of the at least two laser-sensitive colorant components is subject to the condition that other colorant components cannot or cannot substantially change under laser conditions for a certain colorant component. The multilayer body according to claim 6, wherein the multilayer body is characterized by the following. The multilayer body according to claim 11 , wherein the mixture has two or three of colorant components of a cyan colorant, a magenta colorant, and a yellow colorant.   13. The multilayer body according to claim 12, wherein the mixture has two or three of the colorant components of a cyan colorant, a magenta colorant, and a yellow colorant. The said doped material which can be blackened under the effect | action of a laser beam has at least 1 form selected from the group which consists of carbon and a black doped material, The 1-5, 9, 11, 13 characterized by the above-mentioned. The multilayer body according to any one of the above.   The doped material capable of being blackened by the action of a laser beam has at least one form selected from the group consisting of carbon and black doped materials. The multilayer body according to any one of the above. The multi-layer body according to any one of claims 1～5,9,11,13,15 A method for creating a multi-layer image,
By the action of the laser beam of the first laser conditions, the first laser-sensitive layer of the multilayer body, the first laser-sensitive layer to create a first laser-induced image components by marking with multicolor,
By marking the second laser photosensitive layer with multiple colors on the second laser photosensitive layer of the multilayer body by the action of a laser beam under the second laser condition , or the second laser photosensitive layer Creating a second laser-triggered image component by marking the image with monochrome black ,
In the region where the intermediate layer is provided, a laser-induced mark is formed on the upper laser-sensitive layer, and in the region where the intermediate layer is not provided, different laser-induced signals that overlap the upper and lower laser-sensitive layers. Forming the laser-induced image component by forming a mark .   A method for creating a multilayer image on a multilayer body according to any one of claims 6 to 8, 10, 12, 14, and 16, comprising:
  Creating a first laser-induced image component by marking the first laser-sensitive layer in multiple colors on the first laser-sensitive layer of the multilayer body by the action of a laser beam under a first laser condition;
  By marking the second laser photosensitive layer with multiple colors on the second laser photosensitive layer of the multilayer body by the action of a laser beam under the second laser condition, or the second laser photosensitive layer Creating a second laser-triggered image component by marking the image with monochrome black,
  In the region where the intermediate layer is provided, a laser-induced mark is formed on the upper laser-sensitive layer, and in the region where the intermediate layer is not provided, different laser-induced signals that overlap the upper and lower laser-sensitive layers. When the mark is formed, the laser-induced image A method comprising forming an image component. A monochrome black mark is formed only at the position where only the second laser photosensitive layer is present, and at the position where the first laser photosensitive layer is disposed on the intermediate layer and the second laser photosensitive layer. The method of claim 17 , wherein at least one of forming a multicolor mark is performed. A monochrome black mark is formed only at the position where only the second laser photosensitive layer is present, and at the position where the first laser photosensitive layer is disposed on the intermediate layer and the second laser photosensitive layer. The method of claim 18, wherein at least one of forming a multicolor mark is performed. The first laser condition and the second laser condition are different in at least one point selected from the group consisting of a laser wavelength, a laser beam intensity, and an irradiation angle. 20. The method according to any one of 7 or 19 .   The first laser condition and the second laser condition are different in at least one point selected from the group consisting of a laser wavelength, a laser beam intensity, and an irradiation angle. Or the method of any one of 20. The first laser-induced image component and the second laser-induced image component, at the same time, or in relationship displaced from each other temporally, characterized in that you create, in any one of claims 1 7,19,21 2. The method according to item 1.   23. Any one of claims 18, 20, and 22, wherein the first laser-induced image component and the second laser-induced image component are created simultaneously or in a time offset relationship with each other. The method described in 1. Wherein at least one of the first laser-induced image component and the second laser-induced image component is positioned above the different background layer, there is generated a portion of the laser-sensitive layer, the specific The background layer has at least one of the following characteristics i) to iii): i) reflectivity, ii) opacity or substantial opacity, and iii) light absorption. 24. The method according to any one of claims 17, 19, 21, 23 .   At least one of the first laser-triggered image component and the second laser-triggered image component is generated in a portion of the laser-sensitive layer located above the other background layer, Another background layer for the laser beam used, i) Reflective, ii) Opacity or substantial opacity, iii) Absorbance i) From iii) The method according to any one of claims 18, 20, 22, and 24, wherein the method has at least one of the following characteristics. At least one of the first laser-induced image component and the second laser-induced image component, by laser-induced bleaching or laser-induced color change, according to claim 1 7, characterized in that it is made in the form of a multi-color image 26. The method according to any one of 26 . 28. The method of claim 27 , wherein the multicolor image is a full color image. 29. A method according to any one of claims 17 to 28 , characterized in that the second laser-induced image component is created in the form of a grayscale image by laser-induced blackening. At least one of the laser-sensitive material of the first laser-sensitive layer and the laser-sensitive material of the second laser-sensitive layer has a form of a mixture of at least two types of laser-sensitive colorant components, Each of the colorant components is such that the other colorant component does not decolor or substantially decolorize under the laser conditions for one colorant component and is varied by the laser under the corresponding respective laser conditions for each component. 30. A method according to any one of claims 17 to 29 , characterized in that it is possible. Said at least two colorants cyan colorant as the component magenta colorant, and using a mixed colorant comprising two or three of the yellow colorant, the red laser light in order to decolorize the cyan colorant use, use the green laser beam in order to decolorize the magenta colorant, characterized by using a blue laser beam in order to decolorize the yellow colorant the method of claim 30.

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