Process and hot melt adhesive for producing a value or security document consisting of several layers and value or security document

Abstract

Method for producing a value or security document (11) consisting of a plurality of layers (3, 5), in which a hot melt adhesive (4) made of a latently reactive adhesive material is applied in a flowable form or supplied as a film to at least a first or second layer (3, 5) or to both layers (3, 5), and the at least two layers (3, 5) are combined to form a composite body (6) with the hot melt adhesive layer (4) provided therebetween, in which the latently reactive adhesive material is heated and the layers (3, 5) are glued to one another by subsequent cooling, characterized in that a curing time of the hot melt adhesive is shortened by at least one filler introduced into the latently reactive adhesive material.

Description

The invention relates to a method for producing a value or security document consisting of a plurality of layers, in which a latently reactive adhesive material is applied to at least one first or second layer or in which the layers are bonded to one another to form a composite body. The invention further relates to a hot melt adhesive for connecting at least two layers to form a composite body, and to a value or security document.DE 10 2016 218 046 A1 discloses a method for producing a book-like identification, value or security document. This method is carried out in a production unit provided for this purpose in order to produce such book-like identification, value or security documents. In this method, a book block and a cover as well as an adhesive layer are first provided. The adhesive layer is applied to a carrier film and has an activation temperature at which the adhesive layer develops adhesive properties and a curing temperature at which the adhesive layer crosslinks and cures, wherein the curing temperature is higher than the activation temperature. After the adhesive layer has been applied to the inside of the cover, the adhesive layer is heated to the activation temperature and the carrier film is detached. The cover and the book block are then brought together to form a passport book and pre-fixed. After a subsequent folding of the book blank, the adhesive layer is heated to the curing temperature. The passbook blank is held fixed in the folded state until the adhesive layer has cured and a materially bonded and / or positively bonded connection between the cover and the attachment has been produced by the adhesive layer.DE 10 2016 207 548 A1 discloses a thermally curable adhesive composition consisting of an epoxy-functionalized polymer with a thermally activatable hardener for cationic curing of epoxides and at least one type of matrix polymer as a film former with further constituents.DE 10 2009 028 942 A1 discloses an inductively curable adhesive composition which comprises core-shell particles, wherein the shell comprises amorphous silicon dioxide and the core comprises one or more magnetic metal oxides. This adhesive composition is used for bonding wind turbine rotor blades.The object of the invention is to propose a method for producing a value or security document consisting of a plurality of layers and a hot-melt adhesive for a value or security document, in which the processing time is shortened.This object is achieved by a method for producing a value or security document consisting of a plurality of layers, in which a hot-melt adhesive is applied from a latently reactive adhesive material in flowable form or is supplied as a film and at least one filler is introduced into the latently reactive adhesive material, whereby the required curing time of the hot-melt adhesive is reduced. This at least one filler can start or accelerate the crystallization process more quickly in a first process. In a second process, the polymers can be crosslinked more quickly. This leads to a reduction in the curing time. As a result, a further working step, such as, for example, cutting or punching, can be carried out in a shorter time without the cutting or punching tools adhering together. Furthermore, this at least one filler in the latently reactive adhesive material has the advantage that melting is made more difficult or prevented by the crosslinking of the latently reactive adhesive material. Also, after tampering by the absence of the filler in the adhesive material, tampering may be demonstrated. This can provide a security feature for detecting manipulations.It is preferably provided that the hot melt adhesive consists of PUR (polyurethane), PVA (polyvinyl acetate), PE (polyethylene), POR (reactive polyolefin), PA (polyamide), epoxides or silicones. These adhesives are particularly suitable for rapid curing after heating to a curing temperature.It is preferably provided that an amorphous silicon dioxide is mixed as filler. This filler also has the advantage, in addition to the short curing time, that no brittle fractures are produced on the end face of the adhesive layer when the composite body is cut from the at least two layers, but so-called round edges can be achieved. In particular, a silicate gel can be mixed as filler.Alternatively and / or additionally, kaolin, talc, chalk or kieselguhr can be added as filler.Advantageously, a mass fraction of 5 to 25% of filler is mixed with the latently reactive adhesive material for the hot melt adhesive. As a result, an optimum ratio between a shortening of the curing time on the one hand and an adhesive force between the two layers to be connected on the other hand can be achieved.Furthermore, it is preferably provided that the hot-melt adhesive has a curing temperature of greater than 70°, in particular a temperature range between 90 and 130°. This has the advantage that this curing temperature is lower than the softening temperature of the layers to be joined, in particular in embodiments in which the layers to be joined are produced from a polymeric material, such as polycarbonate.Furthermore, it is preferably provided that for producing the value or security document, the at least one first and / or second layer is produced from a thermoplastic polymer. For example, layers of polycarbonate, polyethylene, polyamide or the like can be bonded to one another. Alternatively, it can be provided that the at least one first and second layer consist of paper and / or a paper-like material, such as cardboard or paper-based cover material, for example, which are bonded to one another. Preferably, it is provided that this paper and / or the paper-like material has at least a certain absorbency, so that the hot melt adhesive can form a claw with the individual paper fibers on the surface. It can also be provided that a layer of polymeric material is bonded to paper or a paper-like material. For example, a security patch or a hologram or the like can be bonded to the paper or the paper-like material.It is preferably provided that the first layer is formed as a book cover and the second layer as an attachment of a book block and is applied to an inner side of the book cover or an outer side of the attachment or to both of the hot-melt adhesives according to one of the preceding embodiments and subsequently the attachment and the book cover are aligned with one another, joined together and permanently glued to one another. By using the rapidly curing hot-melt adhesive on account of the at least one filler introduced, the further processing of the book-like value or security document after the alignment, merging and gluing can be accelerated. For example, a working process can subsequently take place in order to punch the book-like value or security document to a final format or at least to cut or punch the book cover to a final format. Further processing steps such as printing or the like can also follow more quickly.The object on which the invention is based is furthermore achieved by a hot-melt adhesive for adhering at least two layers for producing a value or security document, in which at least one filler is introduced into a latently reactive adhesive material which cures by cooling from a curing temperature in order to accelerate the curing time. The at least one filler in the adhesive material can reduce the rest times after the joining and bonding of at least two layers.The latently reactive adhesive material is made of PUR, PVA, PE, POR, PA or silicone.An amorphous silicon dioxide can be added as filler. In particular, a silicate gel is provided.Alternatively and / or additionally, kaolin, talc, chalk or kieselguhr can be added as filler.The introduction of the at least one filler into the latently reactive adhesive material additionally has the advantage that a reverse observation is made possible in the event of a possible manipulation. A manipulation can be detected via the introduced filler, since either the presence of the at least one filler and / or the proportion of the filler in the adhesive will not be present in the original form.Advantageously, a mass fraction of 5 to 25% of filler is introduced into the hot melt adhesive. The at least one filler is preferably mixed uniformly in the latently reactive adhesive material.The hot-melt adhesive with the at least one filler can be formed in liquid form or can be formed as a hot-melt adhesive layer, which is provided in particular on a carrier film which can be removed from the hot-melt adhesive layer.The object on which the invention is based is furthermore achieved by a value or security document in which at least two layers are bonded with a hot-melt adhesive made of a latently reactive adhesive material with filler introduced. During curing of the hot melt adhesive layer, the latently reactive adhesive material is crosslinked. This makes it possible to make manipulation more difficult or prevented by melting this hot-melt adhesive layer in order to release one of the two layers from the composite and replace it again by a manipulated layer.Preferably, one layer is a book cover and the other layer is a front of a book block. As a result, an exchange of a book block, which preferably comprises a data page, in particular a personalization data page, can be made more difficult or prevented.The invention and further advantageous embodiments and developments thereof are described and explained in more detail below with reference to the examples illustrated in the drawings. The features to be gathered from the description and the drawings can be used according to the invention individually or together in any combination. The following are shown: FIG. 1 is a perspective view of a first embodiment of a value or security document, FIG. 2 is a perspective view of a further embodiment of a book-like value or security document; and FIG. 3 shows a schematic side view of the embodiment according to FIG. 2.FIG. 1 shows a perspective view of a first embodiment of a value or security document 11. This value or security document 11 consists of an upper layer 3 and a lower layer 5. The upper and / or lower layers 3, 5 may be formed of a single layer or of multiple layers. By adhering the layers 3, 5 to the layer 4 made of a hot melt adhesive, a composite body 6 is formed. This composite body 6 can be formed as a crude product, which is provided for further processing. This composite body 6 can also be cut by a cutting or punching process to a final format with an outer contour 9, so that the upper and lower layers 3, 5 and the layer 4 of hot melt adhesive have a circumferential end face 7 or 8, respectively. These preferably lie in a common plane.The upper and / or lower layers 3, 5 for producing the composite body 6 can consist of one or more materials made of plastic. In particular, these include polycarbonate (PC) or consist of PC. Further alternatives can be: bisphenol A polycarbonate, carboxy-modified PC, polyethylene terephthalate (PET), derivatives thereof such as glycol-modified PET (PETG), polyvinyl chloride (PVC), polyvinyl butyral (PVB), polymethyl methacrylate (PMMA), polyimide (PI), polybutylene terephthalate (PBT), polyvinyl alcohol (PVA), polystyrene (PS), polyvinyl phenol (PVP), polypropylene (PP), polyethylene (PE), thermoplastic elastomers (TPE), in particular thermoplastic polyurethane (TPU), acrylonitrile-butadiene-styrene copolymer (ABS), and / or derivatives thereof. The layers 3, 5 can also be made of paper and / or cardboard or of mixtures of the aforementioned materials.Preferably, at least one of the further two layers 3, 5 is transparent.The layer 4 of hot melt adhesive may comprise a latent reactive adhesive material consisting of PUR, PVA, PE, POR or PA, silicones or epoxides. At least one filler can be introduced into this adhesive material. As filler, an amorphous silicon dioxide, kaolin, talc, chalk and / or kieselguhr can be mixed in.Preferably, a mass fraction of 5 to 25% of filler is introduced into the adhesive material for forming the hot-melt adhesive. This mass proportion can be formed by one or more filler components. Advantageously, the hot melt adhesive has an adhesive property at a room temperature or a softening temperature which is below a curing temperature, so that the two layers to be connected to one another are pre-fixed. After heating the hot-melt adhesive to a curing temperature of greater than 70°, in particular to a temperature range between 90 and / or 130°, crystallization and crosslinking can take place during the subsequent cooling, as a result of which the hot-melt adhesive layer cures. As a result, a firm connection between the two adjoining layers 3, 5 to form the composite body 6 can be achieved.According to an alternative embodiment, in a first process step, the hot-melt adhesive layer can be prelaminated at a softening temperature onto one of the two layers. After cooling of the hot melt adhesive layer, the layers can be positioned lying one above the other and aligned with one another in a second process step. The alignment can be effected, for example, by shaking in the direction of a contact edge. This alignment is made possible since after cooling of the hot melt adhesive layer, the latter is no longer tacky. The composite is then heated to an activation temperature above 70° and firmly connected to one another. The hot melt adhesive layer then cures.The value document or security document shown in FIG. 1 can be designed as a card-shaped document, for example in an ID-1, ID-2 or ID-3 format. Such a document may be a personal identification card, driver's license, visum, check / credit card, company identification card, proof of authorisation, member identification card, coupon or the like.In Fig. 2 an alternative embodiment of a value or security document 11 is shown as a book-like document.This book-like document 11 comprises a book cover 12 which can form a book cover. The book cover 12 consists of a book cover front side 13 and a book cover rear side 14, which are separated from one another by a folding region 15. The book cover 12 is preferably formed from a layer or a material web. Alternatively, several layers can also form the book cover 14. In particular, a paper, a paper impregnated with plastic, a plastic-paper composite, a laminate of plastic films or the like can be provided. The layer or layers forming the book cover 12 preferably extend completely along the front side 13 of the book cover and the rear side 14 of the book cover over the folding region 15.The book-like document 11 furthermore comprises a book block 22, which book block 22 consists of one or more data pages 19. Preferably, a data carrier 21, such as a personalization data page, can also be provided. Such a data carrier 21 preferably comprises a flap 29. Furthermore, the book block 22 comprises a header 18. the header 18, the at least one data page 19 and the flap 29 of the data carrier 21 are connected to one another in the folding region 15. This can be effected, for example, by forming a seam 30 with at least one thread. Alternatively, the attachment 18, the tab 29 of the data carrier 21 and the at least one data page 19 can be connected to one another by welding and / or lamination in the folding region 15. Alternatively, a combination of the above-described embodiments may also be possible to form a book block 22. The book block 22 is advantageously a manipulatable unit.The data carrier 21 designed as a personalization data page is designed, for example, according to the ICAO standard and comprises an image 24 of the document holder, a machine-readable area 25 (MRZ), and further personalization data 26.According to this exemplary embodiment, the data carrier 21 can furthermore comprise a transponder module 28, in which the data of the document holder and further security features can be stored. The data carrier 21 is designed, for example, as an insert sheet which comprises the tab 29 which extends beyond the folding region 15. Alternatively, a complete personalization page or data page can be provided instead of the tab 29.The data carrier 21 can comprise at least two plastic layers 3, 5 which are bonded or laminated to one another. These can form a composite body 6, for example according to FIG. 1. The transponder module 28 is provided in between. Preferably, a further layer, in particular made of paper, can be introduced between the at least two outer plastic layers 3, 5, which further layer comprises the personalization data 26 and the image 24 and the machine-readable region 25 (MRZ). The outer plastic layers 3, 5 are preferably formed from polycarbonate and preferably completely enclose the further layer, in particular from paper.The transponder module 28 comprises an IC chip 32 and an antenna 31 connected thereto, which consists of a plurality of turns and can preferably be printed on.In this embodiment, the book cover 12 as at least one upper layer 3 and the attachment 18 as at least one lower layer 5 can form the composite body 6 after the adhesion. The inner or intermediate layer 4 for connecting the book cover 12 to the attachment 18 can be designed as an adhesive film or a liquid adhesive layer to be applied, as in the exemplary embodiment according to FIG. 1. The end faces of the attachment 18 and the book cover 12 are preferably situated in the common plane to the end face of the inner layer 4.FIG. 3 is a schematic sectional view along the line III-III in FIG. 1. This sectional view makes it clear that the application segment 37 after cutting or punching to the final format of the book-like document 11 extends as far as the outer edge 39 of the attachment 18 of the front edge of the book cover 12.According to the embodiment in FIG. 3, the book block 22 can additionally have a reinforcing strip 33. This reinforcing strip 33 may be connected to the book block 22 by the seam 30. Preferably, the reinforcement strip 33 consists of a fabric layer, a plastic layer or a combination thereof. This reinforcing strip 33 abuts directly on an outer side of the attachment 18. As a result, the folding region 15 can be reinforced and an increased security during a manipulation can be provided.List of reference characters3 Upper layer 4 Hot melt adhesive 5 Lower layer 6 Composite body 7 End face 8 End face 9 Outer contour 11 Value or security document 12 Book cover 13 Book cover front side 14 Book cover rear side 15 Folding region 18 Attachment 19 Data page 21 Data carrier (personalization data page) 22 Book block 24 Image 25 Machine-readable region 26 Personalization data 29 Tab 30 Seam 31 Antenna 32 Electronic component / IC chip 33 Reinforcing strip

Claims

Method for producing a value or security document (11) consisting of a plurality of layers (3, 5), - in which a hot-melt adhesive (4) made of a latently reactive adhesive material is applied in a flowable form or supplied as a film to at least one first or second layer (3, 5) or to both layers (3, 5), and the at least two layers (3, 5) are brought together with the hot-melt adhesive layer (4) provided in between to form a composite body (6), - in which the latently reactive adhesive material is heated and the layers (3, 5) are bonded to one another by the subsequent cooling, characterized - in that a curing time of the hot-melt adhesive is shortened by at least one filler introduced into the latently reactive adhesive material.Method according to Claim 1, characterized in that a PUR, PVA, PE, POR or PA, silicone is used as latently reactive adhesive.Method according to Claim 1 or 2, characterized in that an amorphous silicon dioxide is added as filler.Method according to one of the preceding claims, characterized in that kaolin, talc, chalk or kieselguhr are added as filler.Method according to one of the preceding claims, characterized in that a proportion by mass of 5 to 25% of filler is mixed into the latently reactive adhesive material.Method according to one of the preceding claims, characterized in that the hot-melt adhesive is adjusted to a curing temperature of greater than 70°, in particular a temperature range of 90 to 130°.Method according to one of the preceding claims, characterized in that the at least one first and / or the second layer (3, 5) are produced from a polymeric material or from paper or a paper-like material.Method according to one of the preceding claims, characterized in that the first layer (3) is designed as a book cover (12) and the at least one further layer (5) is designed as an attachment (18) of a book block (22), in that the hot-melt adhesive is applied to an inner side of the book cover (12) or to an outer side of the attachment (18) or to both, and in that the attachment (18) and the book cover (12) are aligned with one another, joined together and bonded to one another.A hot melt adhesive for connecting at least two layers (3, 5) for producing a value or security document (11), with a latently reactive adhesive material which cures by cooling from an activation temperature, characterised in that the latently reactive adhesive material consists of a PUR, PVA, PE, POR, silicone or PA, in that at least one filler is introduced into the adhesive material, which reduces the curing time, and in that an amorphous silicon dioxide, kaolin, talc, chalk and / or kieselguhr is provided as filler.The hot melt adhesive according to claim 9, characterized in that a mass fraction of 5 to 25% filler is provided in the latently reactive adhesive material.The hot melt adhesive according to one of claims 9 or 10, characterized in that the latently reactive adhesive material with the at least one filler has a curing temperature of greater than 70°, in particular a temperature range of 90 to 130°.A value or security document comprising a plurality of layers (3, 5) which are bonded to one another, characterized in that the layers (3, 5) are bonded to one another with a hot-melt adhesive (4) made of a latently reactive adhesive material with introduced filler according to one of claims 9 to 11.A value or security document according to claim 12, characterised in that the one layer (3) is a book cover and the other layer (5) is a front of a book block.

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