JP2000043458A - Material to be transferred and image display using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To upgrade security against a forgery, a falsification or the like by covering a surface to be transferred of a material to be transferred for transferring an image of an intermediate transfer medium with an adhesive auxiliary layer having a specific weight, thereby strengthening against an external impact and reducing an impregnation of chemicals. SOLUTION: An adhesive auxiliary layer 3 is provided on a base material 2 of a material to be transferred. The layer 3 is formed with a range of 0.5 to 50 g/m2. Such an auxiliary layer 3 is provided on the surface of the material 2, and hence surface smoothness can be given to the image display of a final state. As a result, possibility of image data falsification can be prevented. Since impregnation of chemicals from a side of the material 2 can be prevented, reliability of the display 1 is improved. Further, at the time of adhering, the layer 3 is melted, and hence adherences of the intermediate transfer medium and the image and the material 2 can be facilitated, and the manufacture of the display 1 is facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transfer object of an image display member provided with an OVD medium such as an image pattern or a hologram formed by image data and applied to a booklet such as an ID card and a passport. In particular, the present invention relates to a transferred body that efficiently manufactures an image display body excellent in technology for preventing forgery, tampering, and falsification, and an image display body using the same.

[0002]

2. Description of the Related Art As a method of reproducing an image on this type of image display, there are known methods such as offset printing, gravure printing, screen printing, etc., which have been printed on a substrate in advance, sublimation. Transfer recording method using a transfer ribbon using a resin type melting type or wax melting type in which a dye (heat transferability) dye or pigment is dispersed, or an electrophotographic method, an ink jet method, a photopolymerized recording material, or the like. Various transfer recording methods can be cited as technically possible examples. Further, it is technically difficult to form an image directly on a final recording medium (final product) to which an image is to be applied using these image forming means, the mass productivity is low, or the cost increases. In the case where some problem is involved, for example, an image is formed on an intermediate transfer medium, and then the image is applied to a final product by transfer.

A method of manufacturing the above-mentioned image display body by a thermal transfer method is known (for example, JP-A-6-72018). Hereinafter, an image forming apparatus using a resin-type melting type transfer ribbon will be briefly described as a representative. .

First, as shown in FIG. 4, an intermediate transfer film a used for manufacturing the image display body is provided with a heat-resistant base sheet f made of polyethylene terephthalate or the like and provided on the heat-resistant base sheet f. A releasable protective layer g made of a thermoplastic acrylic resin or the like, and a sublimable (heat transferable) dye provided on the releasable protective layer g and thermally bonded to a substrate of an image display body The main part is constituted by the image receiving / adhesive layer 1 made of a resin material having a property.

Then, as shown in FIG. 5, the intermediate transfer film a is conveyed to an image transfer device j whose main part is composed of a drum h and a thermal head i. A color material layer (not shown) is brought into contact with the image receiving / adhesive layer 1 of the intermediate transfer film a, the thermal head i is pressed from the transfer ribbon k side, and the thermal head i generates heat based on image data. An element group (not shown) is appropriately heated to form an image pattern based on the image data on the image receiving / adhesive layer l. When the image data is multicolor, transfer ribbons having different color tones are applied, and the same process is repeated to form a multicolor image pattern on the image receiving / adhesive layer l.

Next, the image receiving / adhesive layer 1 of the intermediate transfer film a on which the image pattern is formed is applied to the base material b of the image display body.
And a heating medium n such as a hot roll or a hot plate is pressed and heated from the side of the intermediate transfer film a to press the image receiving / adhesive layer l onto the base material b, and heat resistance from the intermediate transfer film a An image display such as an ID card is manufactured by peeling the base sheet f.

[0007] As an image display containing such kind of personal recognition data, an image pattern s formed on the basis of image data as shown in FIG. Or FIG. 6 (B)
As shown in FIG. 5, in addition to the image pattern s, an OVD (Optical Variable Descriptor) represented by a hologram or a diffraction grating image.
vice) An image having an image t is known.

These holograms and diffraction grating OVD techniques require advanced manufacturing techniques and are difficult to duplicate, so that credit cards, ID cards,
It has been used for cards such as prepaid cards. Furthermore, due to its high decorativeness, it is often used for packaging materials, books, pamphlets, POPs, and the like. In the present specification, techniques for optically expressing an image such as the hologram image and the diffraction grating image are collectively referred to as OVD. As a means for attaching these OVDs to an article, a method of transfer-forming using a transfer foil has conventionally been adopted. This type of transfer foil has a release layer on the base sheet,
There is known a configuration in which a relief layer on which an image pattern of a hologram or a diffraction grating is formed, a reflective layer formed by a known thin film forming means, and an adhesive layer are sequentially laminated. These OVD patterns (holograms and diffraction grating patterns) engraved on the transfer foil are copied in a large amount by a well-known method of duplicating a fine concavo-convex pattern on a nickel press plate and heating and pressing the relief layer. I have.

Further, the reflective layer is formed by forming a transparent substance having a different refractive index by a known thin film forming means such as a vacuum evaporation method (hereinafter, referred to as a transparent thin film layer) to form a transparent hologram or a transparent diffraction grating formed body. It is a known technique.
In this case, it is apparent from an optical point of view that the larger the difference in refractive index between the relief layer and the transparent thin film layer (relief layer <transparent thin film layer), the greater the reflectance.

The method for forming the OVD transfer sheet will be briefly described. FIG. 7 is a cross-sectional view illustrating a configuration example of the transparent OVD transfer sheet. The OVD transfer sheet has a layer that reflects light while transmitting light, that is, a transmissive thin film layer 73b, and has an excellent eye-catching effect without impairing the design such as printing on the base material that is the transfer target. be able to. Hereinafter, the configuration will be described based on the cross-sectional view of FIG. A release layer (peelable protective layer) 72 is formed on a support 71, and a relief forming layer 73 a provided with an OVD pattern such as a hologram or a diffraction grating and a transparent thin film layer 73 b are formed on the release layer 72. This transparent thin film layer 73
An adhesive layer 74 is formed on b. In the above description and the following description, the upper and lower relations are reversed in the cross-sectional view and the description, but the upper and lower relations are in the direction of observing the transfer foil (or the use state when transferring and forming the transfer foil). ) Is not essential because it changes according to.

The relief forming surface of the OVD layer 73 is
When present on the opposite side of the support 71 and transferred to the article surface, the release layer 72 is peeled off at the interface with the base material 71, and migrates to the article side to function as a protective layer.
It may be referred to as a “peelable protective layer”. Furthermore, the layers that move to the article side, excluding the support, are collectively referred to as “transfer layers”.
Shall be referred to as

Each drawing schematically represents the configuration of the transfer foil, and the dimensions such as the thickness of each layer are not based on actual products.

For these holograms, a relief-type master plate composed of a fine concavo-convex pattern is generally prepared by an optical photographing method, and a nickel press plate obtained by duplicating the concavo-convex pattern by an electroplating method is duplicated. Mass replication is performed by a known method of heating and pressing this press plate on the relief forming layer 73a.

Unlike a hologram capable of reproducing a three-dimensional image, a plurality of types of simple diffraction gratings are arranged in a small area to form pixels, and a diffraction grating image such as a grating image or a pixelgram expressing an image is also used. , Mass replication is performed in the same way as holograms, and credit cards, cash cards,
Various cards such as membership card, employee ID card, prepaid card, driver's license, various paper tickets such as gift certificate, gift certificate, stock certificate, various forms such as application form, receipt, copy slip, etc., In addition to various booklets such as passports, passbooks, pension notebooks, etc., they are used by being attached to a part or the entire surface of a book or notebook, such as a cover or panel, for display use.

However, an image display manufactured using a resin-type melt-type transfer ribbon in which a pigment is dispersed as described above has a plurality of color materials laminated thereon to express gradation.
When the final form is reached, there is a step due to the density difference of the image on the surface, so external impact (scratch or wear)
Disadvantageously, which could trigger forgery or tampering. Further, when the base material of the transfer receiving body is made of paper or the like, when the image receiving layer and the image are transferred by heating and pressing, good adhesiveness is obtained unless sufficiently melted and entangled with the fibers of the paper. Can not do too much heat
This method requires pressure and time, and cannot be used as a printer for immediate issue such as a passport or an ID card. When an image display manufactured using a paper substrate as described above is subjected to various resistance tests represented by JIS-X6305, the image deteriorates due to the penetration of various chemicals from the paper substrate. -There was a problem of disappearing.

[0016]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above problems, and is resistant to external impacts, has little chemical penetration, and does not require excessive heat, pressure and time. It is an object of the present invention to provide an image display body that can be adhered, has good security against forgery and tampering of the image display body, has excellent resistance, and has excellent mass productivity.

[0017]

According to a first aspect of the present invention, there is provided:
An image based on image information is recorded on the image receiving layer of the intermediate transfer medium having at least the image receiving layer provided on a film-shaped support by a thermal transfer method, and the image is recorded on the intermediate transfer medium and the transfer receiving body. A transfer surface on which the image of the intermediate transfer medium is transferred by transferring the image of the intermediate transfer medium together with the image receiving layer by heating and pressing the overlapped surface side on the transfer target side. 0.5 g / m ^2-
An object to be transferred, wherein the adhesion auxiliary layer is coated with a weight within a range of 50 g / m ² .

According to a second aspect of the present invention, the adhesion auxiliary layer is made of a thermoplastic resin having a softening point in a range of 45 ° C. to 200 ° C. 2. The transfer object according to claim 1, wherein the auxiliary layer is melted or softened to thermally bond the image receiving layer and the image.

In a third aspect of the present invention, an image based on image information is recorded on the image receiving layer of an intermediate transfer medium having at least an image receiving layer provided on a film-shaped support by a thermal transfer method. An image display body formed by transferring an image of the intermediate transfer medium to an image receiving layer together with an image receiving layer by heating and pressing the transfer medium and the image receiving body such that the surface side on which the image is recorded is placed on the image receiving side. Wherein 0.5 g / m ^{2 is applied} to the transfer surface of the transfer object on which the image of the intermediate transfer medium is transferred.
An image display body characterized in that the adhesion auxiliary layer is coated with a weight within the range of 〜50 g / m ² .

According to a fourth aspect of the present invention, the adhesive auxiliary layer is made of a thermoplastic resin having a softening point in a range of 45 ° C. to 200 ° C. 4. The image display according to claim 3, wherein the auxiliary layer is melted or softened and the image receiving layer and the image are thermally bonded.

[0021]

In an image display manufactured using a conventional intermediate transfer medium and a transfer-receiving body, there is a high possibility that only the image portion is peeled off due to a step caused by a difference in image density.
In addition, when not only the chemicals used in various resistance tests but also spills of living substances (especially alcohols represented by sake) by mistake, the image deteriorates and disappears due to the chemicals permeating from the base material side. May be lost. In the present invention, the provision of the adhesion auxiliary layer on the surface of the transfer object imparts the surface smoothness of the final image display body, thereby preventing the possibility of falsification of the image data. Further, in order to prevent penetration of chemicals from the substrate side in various resistance tests, the reliability as an image display is improved. Further, since the adhesion between the intermediate transfer medium and the image and the base material (transfer object) can be easily performed, the manufacture of the image display body can be facilitated.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below. FIG. 1 is a cross-sectional view illustrating a basic configuration of an image display 1 according to the present embodiment. An adhesion auxiliary layer 3 is provided on a base material 2 made of a material such as paper or PVC, an image receiving layer 4 having image information is provided on the adhesion auxiliary layer 3, and a protective layer 5 is provided on the image receiving layer 4. Each is provided.

In this embodiment, an image is formed on an intermediate transfer medium containing an OVD image by using a resin-type melting type transfer method in which a pigment is dispersed, and then transferred onto a substrate provided with an adhesion auxiliary layer. A method for manufacturing a display will be described as a representative.

<Manufacture of Resin-Type Melt Transfer Ribbon>
Pigments of three colors (yellow, cyan, magenta, black) are respectively dispersed in a vinyl chloride / vinyl acetate copolymer resin to prepare a pigment ink, and each color is alternately formed on a 6 μm-thick polyethylene terephthalate film using a gravure coater. And dried to produce a resin-type melt transfer ribbon having four color pigment layers (not shown). Note that characters, figures, barcodes, and the like formed in the above black color are sometimes used as optical character identification (OCR).
It is necessary to appropriately adjust the black pigment concentration and the film thickness so that the value (Print Contrast Signal) becomes 0.6 or more. Further, a magnetic material may be added and used as a magnetic ink character identification (MICR).

<Manufacture of Intermediate Transfer Sheet> The intermediate transfer sheet according to this embodiment has the structure shown in FIG.
That is, the peelable protective layer 5 is formed on the support 6, the OVD layer 7 is formed on the peelable protective layer 5, and the image receiving layer 4 is formed on the OVD layer 7.

Here, the support 6 is required to have heat resistance and strength so as not to be softened and deformed by the heat pressure in thermal transfer. The material can be selected independently from synthetic resins such as polyvinyl chloride, polyester, polycarbonate, polymethyl methacrylate, polystyrene, polyethylene, polyethylene terephthalate, polyethylene naphthalate, polypropylene, polyvinyl alcohol, etc., natural resins, paper, synthetic paper, etc. Or a complex selected from the above and combined. The thickness may be 2 to 100 μm in consideration of operability and workability, but is preferably about 6 to 50 μm in consideration of handling properties such as transfer suitability and workability.

In this example, a polyethylene terephthalate film having a thickness of 16 μm was used, and a peelable protective layer composition having the following compounding ratio was applied and dried to a thickness of 1.5 μm. The releasable protective layer 5 is provided for more effectively transferring the OVD layer 7 and the image receiving layer 4 to a transfer target (not shown). Furthermore, when it becomes a final product, it functions as a protective layer. Acrylic resin 30 parts by weight Polyester resin 5 parts by weight Polyethylene powder 5 parts by weight Toluene 40 parts by weight Methyl ethyl ketone 40 parts by weight Methyl isobutyl ketone 20 parts by weight

As the releasable protective layer 5, a thermoplastic resin, a thermosetting resin,
Either an ultraviolet ray or an electron beam curable resin may be used, but a thermoplastic resin is preferable in consideration of flexibility and foil breakability. Examples include thermoplastic polyacrylate resins, chlorinated rubber resins, vinyl chloride-vinyl acetate copolymer resins, cellulose resins, chlorinated polypropylene resins, epoxy resins, polyester resins, nitrocellulose resins, and styrene. An acrylate resin, a polyether resin, a polycarbonate resin, or the like can be used alone or in combination. In consideration of the foil breaking property and friction resistance, various waxes such as petroleum wax and vegetable wax, metal salts of higher fatty acids such as stearic acid, lubricants such as silicone oil, Teflon powder, polyethylene powder, silicone Organic fillers such as fine particles and acrylonitrile-based fine particles and inorganic fillers such as silica fine particles can also be added.

The peelable protective layer 5 need not be provided when the support 6 itself has peelability or when the support 6 itself has been subjected to a release treatment. However, in this case, it is possible to impart friction resistance to the outermost layer (OVD layer 7 in this embodiment) after transfer, or to provide a protective layer after transfer. The thickness of the peelable protective layer 5 can be formed in the range of 0.1 to 50 μm, and is not particularly limited when the protective layer is provided later.

Next, in this embodiment, as an example of the OVD layer, a relief type transparent hologram shown in FIG. 2B was used. The manufacturing method will be described below. The relief forming layer 8 has a hologram relief forming surface on the surface opposite to the peelable protective layer 5, and the transparent thin film layer 9 is formed on the relief forming surface. The relief forming surface can be formed by heating and pressing a nickel press plate on which a fine uneven pattern constituting the relief hologram is formed on the relief forming layer 8. The relief forming layer 8 may have a hologram pattern on the layer surface (the above-described relief forming surface) or in the layer. In addition, the relief forming layer 8 may be finely divided by two-beam interference or a diffraction grating (grating) by an electron beam (EB). A grating hologram or a Lippmann hologram having an uneven shape is applicable. Further, the transparent thin film layer 9 is formed of the relief forming layer 8 (refractive index n = 1.3).
To 1.7), for example, inorganic materials shown in Table 1 below can be used. Further, the transparent thin film layer 9 may be formed by laminating a plurality of layers, or may be a combination of layers having different refractive indices, or a multilayer film in which layers of high refractive index and layers of low refractive index are alternately laminated. Good.

[0031]

[Table 1]

As a method for forming such a transparent thin film layer 9, a sputtering method,
A film forming means such as an ion plating method can be applied, and the film thickness is preferably in the range of 10 nm to 1000 nm. Further, TiO 2 is used as the transparent thin film layer.
A high-refractive fine powder such as ₂ may be dispersed in a resin so that the difference in refractive index from the relief forming layer 8 is 0.2 or more. In this case, since a coating film can be formed by a general coating method, the film thickness is not limited to the above-described film thickness.

Here, the relief forming layer 8 has good embossing formability, hardly causes press unevenness, obtains a bright reproduced image, and has good adhesion to the peelable protective layer 5 and the transparent thin film layer 9. The resin is good, and here, a composition having the following compounding ratio was used, and formed so that the thickness after drying was 1.0 μm. Polyurethane resin: 30 parts by weight Methyl ethyl ketone: 70 parts by weight Toluene: 30 parts by weight The relief forming surface was formed with such a composition at a plate surface temperature of the above-described press plate of 160 ° C.

The relief forming layer 8 may be made of a thermoplastic resin such as a polycarbonate resin, a polystyrene resin, or a polyvinyl chloride resin, an unsaturated polyester resin, or the like.
Thermosetting resins such as melamine resin, epoxy resin, urethane (meth) acrylate, polyester (meth) acrylate, epoxy (meth) acrylate, polyol (meth) acrylate, melamine (meth) acrylate, triazine (meth) acrylate, and the like Mixtures, thermoformable materials having radically polymerizable unsaturated groups, and the like can be used. In addition, materials other than those described above can also be used as long as they are stable enough to form OVD images.

The transparent thin film layer 9 is a transparent material for transmitting the information of the relief forming layer 8 and has a thickness of 5 here.
0 nm ZnS was formed by a vacuum evaporation method.

Although the means for forming the relief surface has been described above, the method for forming the relief surface after the formation of the permeable thin film layer 9 is also becoming mainstream at present. There is no.

Next, an image receiving layer composition having the following compounding ratio was applied on the transparent thin film layer 9 to a thickness of 4.0 μm and dried (drying: 100 ° C., 5 min). Vinyl chloride-vinyl acetate copolymer: 30 parts by weight Polyester resin: 30 parts by weight Methyl ethyl ketone: 50 parts by weight Toluene: 50 parts by weight The image receiving layer 4 is made of, for example, polyester such as linear saturated polyester, polyvinyl chloride or chloride. Vinyl chloride resin such as vinyl-vinyl acetate copolymer resin, polyacrylic acid, 2-methoxyethyl polyacrylate, methyl polyacrylate, 2-naphthyl polyacrylate, isobornyl polyacrylate, polymethacrylomethyl , Polyacrylonitrile, polymethylchloroacrylate, polymethyl methacrylate, polyethyl methacrylate, poly-tert-butyl methacrylate, polyisobutyl methacrylate, polyphenyl methacrylate, methyl methacrylate and alkyl methacrylate (but alkyl Having a carbon number of 2 to 6) such as an acrylic resin such as a copolymer resin, polystyrene, polydivinylbenzene, polyvinylbenzene, a styrene-butadiene copolymer resin, and styrene and an alkyl methacrylate (where the carbon number of the alkyl group is 2 to 6). 6) and the like, but are not limited thereto.

Further, in order to prevent discoloration and fading of the color material constituting the image due to light, the maximum absorption wavelength of 250 to
A 400 nm ultraviolet absorber may be added. Such ultraviolet absorbers include, for example, phenyl salicylate,
Salicylic acid UV absorbers such as p-tert-butylphenyl salicylate and p-octylphenyl salicylate, 2,4-dihydroxybenzophenone, 2-hydroxybenzophenone, 2-hydroxy-4-octoxybenzophenone, 2-hydroxy-4- Dodecyloxybenzophenone, 2,2′-dihydroxy-4-methoxybenzophenone, 2,2′-dihydroxy-4,
4'-dimethoxybenzophenone, 2-hydroxy-4
Benzophenone-based ultraviolet absorbers such as -methoxy-5-sulfobenzophenone, 2- (2'-hydroxy-5'-
Methylphenyl) benzotriazole, 2- (2′-hydroxy-5′-tert-butylphenyl) benzotriazole, 2- (2′-hydroxy-3′-tert)
-Butyl-5'-methylphenyl) benzotriazole, 2- (2'-hydroxy-3 ', 5'-ditert
-Amylphenyl) benzotriazole-based ultraviolet absorbers such as benzotriazole, 2-ethylhexyl-2-cyano-3,3'-diphenylacrylate, ethyl-2
And cyanoacrylate-based ultraviolet absorbers such as -cyano-3,3-diphenylacrylate. Also, T
A fine powder inorganic ultraviolet shielding agent such as iO2 or ZnO may be used. The mixing ratio of the ultraviolet absorber may be in the range of 5 to 40 parts by weight with respect to 100 parts by weight of the composition comprising the resin or the like constituting the image receiving layer.

<Manufacture of Transferred Object Provided with Adhesion Auxiliary Layer> In this example, the transferred member 2 was made of paper.

The paper used in the present invention is made from vegetable fiber or synthetic fiber, beaten in water and entangled.
Dehydrated and dried. At this time, the strength between fibers is obtained by the hydrogen bond between the hydroxyl groups of the cellulose as the raw material. Additives used for paper include clay, talc, calcium carbonate, titanium dioxide, etc., and sizing agents include rosin, alkyl ketene dimer, stearic anhydride, alkenyl succinic anhydride, wax, etc. Examples of the enhancer include modified starch, polyvinyl alcohol, polyacrylamide, urea-formaldehyde, melamine-formaldehyde, polyethyleneimine, etc., and these materials are added at the time of papermaking, respectively, and are mainly formed by a fourdrinier paper machine. is not.

The paper-making method may be a method used in the production of ordinary plant fiber paper. Fibers sufficiently expanded with a water-diluted raw material having a raw material concentration of 0.1 to 5%, preferably 0.3 to 0.6% are used. It is made by kneading well, pouring it on a slender, stitched wire, etc., squeezing water, and evaporating water by heating.

In addition, when synthetic fibers or magnetic metal fibers other than plant fibers are mixed for security purposes, a binder is often required because the synthetic fibers do not have a binding force such as a hydrogen bond. Therefore, it is desirable that the synthetic fiber ratio and the amount of the binder are appropriately determined so as not to reduce the strength of the paper.

As the adhesion auxiliary layer, for example, polyester resin, vinyl chloride resin, vinyl acetate resin, vinyl chloride
Vinyl acetate copolymer resin, ethylene-vinyl acetate copolymer resin, epoxy resin, urethane resin, styrene-butadiene copolymer resin, polystyrene, polyvinyl butyral,
Thermoplastic resins such as acrylic resin, styrene-acrylic copolymer resin, nitrocellulose resin, chlorinated polypropylene resin, chlorinated rubber, polyvinyl alcohol, vinylidene chloride resin, polyvinyl formal, polyethylene, polypropylene, polybutene, and petroleum resin are representative examples. . The thermoplastic resin has a softening point of 45 ° C. to 20 ° C.
Those within the range of 0 ° C. can be applied, and if the temperature is less than 45 ° C., it is too soft, and when a transfer receiving body is overlapped, a problem such as that an image display body in a final form is easily scratched occurs. If the temperature exceeds 200 ° C., the softening during transfer is unlikely to occur, so not only the unevenness due to the density difference in the image area does not disappear, but also the issuing speed becomes slow when used as an immediate issuing printer for applications such as ID cards and passports. Can not be used for

The above-mentioned adhesion auxiliary layer can be formed in a range of 0.5 g / m ² to 50 g / m ² , and the above-mentioned thermoplastic resins are used alone or in combination.

The above-mentioned thermoplastic resin is prepared by dispersing and dissolving a coating solution of water or various organic solvents in a known solvent coating method such as bar coating, blade coating, air knife coating, gravure coating and roll coating, or screen printing. It is applied on a substrate such as paper or a plastic film, synthetic paper, resin-impregnated paper, or non-woven fabric by a coating method and dried to form a thermosensitive recording medium. Alternatively, the transfer ribbon may be prepared and then transferred and formed on the substrate.

In preparing the coating material, the adhesive auxiliary layer contains various fillers such as titanium oxide, calcium carbonate and talc, pigments, zinc stearate, calcium stearate and other higher fatty acid metal salts for preventing blocking, and polyethylene wax. And waxes such as carnauba wax can be used as needed.

[0047]

EXAMPLES The adhesion auxiliary layer 3 was formed on the entire surface of the base material using a composition having the following compounding ratio so that the thickness after drying was 5.0 g / m ² . Polyurethane resin (softening point 110 ° C) ... 45 parts by weight Epoxy resin (softening point 128 ° C) ... 5 parts by weight Methyl ethyl ketone ... 40 parts by weight Toluene ... 10 parts by weight

Further, it is a matter of course that a printing layer (not shown) may be provided on the base material or the adhesion auxiliary layer.
Various techniques such as iris pearl chip, fading ink, fluorescent ink, thermal ink, ink that changes optically (OVI), fine line printing, rainbow printing, intaglio printing, pixel printing, etc. Can be incorporated.

Then, the intermediate transfer medium and the transfer ribbon thus manufactured are set in the apparatus shown in FIG.
As in the conventional method, the heating element group of the thermal head is caused to generate heat based on image data, and a multicolor face photograph 10 and character information 11 composed of a resin-type molten ribbon in which the above-described pigment is dispersed in the image receiving layer 4 of the intermediate transfer medium are obtained. Form. Thereafter, the image receiving layer 4 of the intermediate transfer film is brought into contact with the base material 2 (transfer object) provided with the adhesion auxiliary layer 3, and a heating medium is pressed and heated from the intermediate transfer film side (heating temperature: 150). C), the image receiving layer 4 was pressed onto the substrate, and the support 6 was peeled off from the intermediate transfer medium to produce an image display as shown in FIG.

<Comparative Example> Next, as a comparative example, a conventional image display having no adhesion auxiliary layer 3 was prepared using the same apparatus as in Example 1.

Table 2 shows the effect of the adhesiveness (cellotape peel test) on the transfer conditions (temperature: 150 ° C., changing the transfer speed) of each of the image display bodies manufactured in Examples and Comparative Examples.

[0052]

[Table 2]

Next, a cross-sectional photograph of the image display prepared under the conditions shown in Table 2 above was taken. In the image display prepared in the example, the image portion was embedded in the adhesion auxiliary layer, Was smooth, but in the image display body manufactured in the comparative example, a step due to image density remained on the surface. (Not shown)

Next, the image display prepared under the conditions shown in Table 2 was tested under the following chemical resistance test items. The results are shown in Table 3. 50% ethanol immersion for 24 hours 1% aqueous sodium carbonate solution immersion for 24 hours 5% acetic acid aqueous solution immersion for 24 hours 5% saline immersion for 24 hours 50% sugar water immersion for 24 hours Acidic artificial sweat liquid (Method A) Soaked for 24 hours Alkaline artificial sweat liquid (A) Method) 24 hours of immersion

[0055]

[Table 3]

[0056]

As described above, the provision of the adhesion assisting layer on the object to be transferred makes it possible to impart the surface smoothness of the image display body as the final form, which makes the image display body resistant to external impacts and prevents forgery and tampering. Can be prevented. In addition, when the transfer medium and the intermediate transfer medium (image) are bonded, the bonding auxiliary layer is melted, so that bonding can be performed without requiring excessive heat, pressure, and time.
Since stronger adhesion can be obtained and the issuance speed can be improved, it can be used as an immediate issuance printer. Furthermore, since it is possible to prevent the penetration of living substances (alcohols such as alcohol) from the base material side,
You can solve problems such as image deterioration and loss,
A highly reliable image display can be provided.

Further, by providing an OVD image on the entire surface, it becomes more difficult to partially alter a face photograph, character information, and the like, and it is possible to provide an image display with higher anti-counterfeiting properties.

[0058]

[Brief description of the drawings]

FIG. 1 is an explanatory cross-sectional view of a basic configuration of an image display according to the present invention.

FIG. 2 is an explanatory diagram of an embodiment of the present invention, and FIG.
Is a basic cross-sectional explanatory view of the intermediate transfer sheet of the present embodiment,
FIG. 2B is a specific cross-sectional explanatory view of the intermediate transfer sheet of the present embodiment.

FIG. 3 is a front view of the image display body created in the embodiment of the present invention.

FIG. 4 is a cross-sectional view of a conventional intermediate transfer sheet.

FIG. 5 is an explanatory diagram of an apparatus for creating an image display using an intermediate transfer sheet.

FIG. 6A and FIG. 6B are plan views showing a conventional image display medium.

FIG. 7 is a cross-sectional view illustrating a configuration example of a conventional transparent OVD transfer sheet.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Image display body 2 ... Substrate 3 ... Adhesion assistance layer 4, 74 ... Image receiving (adhesion) layer 5, 72 ... Peeling protection Layer 6, 71 ... Support 7, 73 ... OVD layer 8, 73a ... Relief forming layer 9, 73b ... Transparent thin film layer 10 ... Face photograph information 11 ...・ Character information a ・ ・ ・ ・ ・ ・ Intermediate transfer film b ・ ・ ・ ・ ・ ・ Base material f ・ ・ ・ ・ ・ ・ Base sheet g ・ ・ ・ ・ ・ ・ Releasable protective layer h ・ ・ ・ ・ ・ ・ Drum i: thermal head j: image transfer device k: transfer ribbon l: image receiving / adhesive layer n: heating medium r: ····· Card base material s ····· Image pattern t ····· OVD image

 ──────────────────────────────────────────────────続 き Continued from the front page F term (reference) 2C005 HA01 HA09 HB02 HB17 JA15 JB02 JB08 JB09 JB23 KA37 KA40 KA45 LA11 LA14 LA20 LA22 LA25 LA30 2H111 AA01 AA07 AA08 AA26 AA27 AB05 CA02 CA03 CA25 CA30 CA04 3B005 EC01 EA01 FA16 FB03 FB09 FB13 FB18 FB22 FD05X FD05Y GA02 GB01 4J004 AA02 AA04 AA05 AA06 AA07 AA09 AA10 AA15 AB03 CA02 CA05 CB02 CC02 CE02 DA02 DA03 DA05 DB02 FA01

Claims (4)

[Claims] An image based on image information is recorded on an image receiving layer of an intermediate transfer medium provided with at least an image receiving layer on a film-shaped support by a thermal transfer method. Is transferred onto the image receiving layer by transferring the image of the intermediate transfer medium together with the image receiving layer by heating and pressurizing the surface side on which the image is recorded on the transfer target side, and the image of the intermediate transfer medium is transferred. that to a transfer surface of the transfer member, the transfer member bonding auxiliary layer in a weight in the range of 0.5g / m ² ~50g / m ² is characterized in that it is coated. 2. The adhesive auxiliary layer has a softening point of 45 ° C. to 200 ° C.
The image forming apparatus according to claim 1, wherein the adhesive auxiliary layer is melted or softened to thermally bond the image receiving layer and the image when the intermediate transfer medium is heated and pressurized on the object to be transferred. 2. The transferred body according to 1. 3. An intermediate transfer medium having at least an image receiving layer provided on a support in the form of a film, wherein an image based on image information is recorded on the image receiving layer by a thermal transfer method, and the intermediate transfer medium and the transfer object are recorded. An image display body obtained by transferring the image of the intermediate transfer medium to the image receiving layer together with the image receiving layer by heating and pressing the surface on which the image is recorded on the image receiving layer side, image display, characterized in that on the transfer surface of the transfer material on which an image of the medium is transferred, the adhesive auxiliary layer in a weight in the range of 0.5g / m ² ~50g / m ² is coated. 4. The adhesive auxiliary layer has a softening point of 45 ° C. to 200 ° C.
° C, and the image-receiving layer and the image are heat-bonded by melting or softening the adhesion auxiliary layer when the intermediate transfer medium is heated and pressurized on the object to be transferred. The image display according to claim 3.