JP3325817B2 - card - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a card, and more particularly, to a card having a complex image such as a face photograph mainly using a sublimation transfer system.

[0002]

2. Description of the Related Art Conventionally, many cards such as an identification card, a driver's license, and a membership card have been used, and these cards record various kinds of information for clarifying the identity of the owner.
Especially in the case of an ID card, a face photograph is the most important.

[0003]

The classical method of giving a face photograph to various cards is to attach the face photograph to a predetermined portion of the card base using an adhesive. However, there are drawbacks that the operation is very complicated and that the surface of the card becomes uneven and the smoothness is lost.
As a method to solve the disadvantages of the above method of attaching a face photograph,
An image forming method using a sublimation transfer method has been developed.

In this sublimation transfer method, a sublimation type thermal transfer sheet provided with a layer containing a dye which is sublimated and transferred by heat is superposed on a surface of a substrate film and a card substrate, and heated by a thermal head from the back of the sublimation transfer sheet. This is a method of reproducing a face photograph on a card base material, and has the advantage that it can be performed with a simple thermal transfer printer. However, when the above-described sublimation transfer method is used, the card base material is required to have a sufficient dyeing property with respect to the sublimable dye.

On the other hand, most of the conventional card base materials do not have sufficient dyeing properties for sublimable dyes, so that an image cannot be formed as it is. As a method for solving such a drawback, a method has been performed in which a polyester resin layer having good dyeability of a sublimable dye is previously formed as a dye receiving layer on the surface of a card base material. The formation of the dye receiving layer is not only complicated, but also has a drawback that the card base material is liable to cause curling and peeling of the dye receiving layer.

Accordingly, it is an object of the present invention to provide a card which can form an image such as a face photograph immediately by a sublimation transfer method without having to provide a dye receiving layer in advance.

[0007]

The above object has been achieved by the present invention described below. That is, the present invention relates to 0.1 to 10 parts by weight of a plasticizer per 100 parts by weight of polyvinyl chloride .
A full-color gradation image and a monotone image are formed on at least one surface of a polyvinyl chloride card base material containing 1 to 5 parts by weight of a lubricant, and the full-color gradation image is formed by a sublimation-type thermal transfer method. An image composed of the dye,
Further, the card is characterized in that the monotone image is an image composed of a pigment ink formed by a hot-melt type thermal transfer system.

[0008] At least the dye-receiving surface of a card substrate mainly composed of a polyvinyl chloride resin has a specific amount of a plasticizer and a lubricant.
Thus , any image can be easily formed by a sublimation transfer method without any formation of a dye-receiving layer.

[0009]

Next, the present invention will be described in more detail with reference to preferred embodiments. In the present invention, the polyvinyl chloride resin itself used for forming the card substrate may be a known one. In the present invention, when preparing a card base material from polyvinyl chloride according to a conventional method, 0.1 to 10 parts by weight of a plasticizer and 0.1 to 5 parts by weight per at least 100 parts by weight of polyvinyl chloride are present on at least the dye receiving surface. It has been found that the dye-receiving surface has a sufficient dyeing property for a sublimable dye by incorporating a lubricant of the formula (1).

The plasticizers used in the present invention include dibutyl phthalate, di-n-octyl phthalate, and di (2
-Ethylhexyl), dinonyl phthalate, dilauryl phthalate, butyllauryl phthalate, butylbenzyl phthalate, di (2-ethylhexyl) adipate, di (2-ethylhexyl) sebacate, tricresyl phosphate, tri (2- Conventionally known plasticizers such as ethylhexyl), polyethylene glycol ester and epoxy fatty acid ester can be used.

The amount of these plasticizers used is 0.1 to 10 parts by weight per 100 parts by weight of polyvinyl chloride forming the dye receiving surface, and a particularly preferred range is 3 to 5 parts by weight. If the amount of the plasticizer is too small, the dyeing property for the sublimable dye is insufficient, while if too large, the rigidity of the dye-receiving surface becomes insufficient and the dye-receiving surface becomes soft, and the dye layer of the thermal transfer sheet is directly transferred during thermal transfer. Abnormal transcription occurs,
Further, bleeding occurs in the printed image during storage, and a clear image cannot be obtained, which is not preferable.

[0012] Also, in this onset bright, by addition to the plasticizer, to further encompass the lubricant polyvinyl chloride 100 parts by weight per 0.1 to 5 parts by weight to form a dye-receiving surface, a plasticizer Even when polyvinyl chloride is incorporated in a relatively large amount, for example, at a ratio of 5 to 10 parts by weight, there is no blocking of the thermal transfer sheet at the time of transfer, and the resulting dye-receiving surface has further improved dyeability by the sublimable dye. Found to improve.

As such a lubricant, any conventionally known lubricant such as fatty acid, fatty acid amide, wax, paraffin and the like can be used. If the amount of these lubricants is too small, the effect of the addition will be ineffective, and if the amount is too large, the resulting dye-receiving surface will be undesirably rough. or,
By using these lubricants, not only the dyeability of the sublimation dye is improved, but also the fusion between the sublimation-type thermal transfer sheet and the dye-receiving surface is reduced even when a relatively high temperature is used during sublimation transfer. High-density images can be formed more efficiently.

[0014]

The main components of the dye-receiving surface of the card substrate used in the present invention are as described above. Of course, in the present invention, a color pigment, a white pigment, an extender, a filler, an ultraviolet absorber, Inhibitors, heat stabilizers, antioxidants, optical brighteners and the like can also be used arbitrarily. The card base material used in the present invention is obtained by blending the necessary components as described above, and subjecting the blended material to a sheet having a thickness of, for example, about 0.05 to 1 mm by a known forming method such as a calendering method or an extrusion method. The present invention encompasses both a sheet obtained before molding into a card size and a sheet obtained by cutting into a card size.

FIGS. 1 and 2 show a basic form of a preferred card substrate 1 of the present invention, which is a sheet having a thickness of about 0.1 to 1 mm. A dye layer 2 of a known sublimation type thermal transfer sheet A is superposed on the surface of the card substrate 1 and heated from a back surface of the sublimation type thermal transfer sheet A by a thermal head 3 or the like, so that the dye reception of the card substrate 1 is performed. A desired image 4 is formed on the surface. Needless to say, such a card base material may be formed in advance with the necessary embossed pattern 5 or other printed pattern 6 on its surface, or provided with these embossed pattern 5 or printed pattern 6 after sublimation transfer. You may.

In particular, the image formed according to the present invention is different from the conventional photographic image attached, and can be directly embossed on the image surface, so that it is more excellent in anti-counterfeiting properties. Further, it is a matter of course that the transparent protective layer 7 may be formed on the entire surface or a part of the surface for improving the durability of these images.

FIG. 3 shows a cross section of a card base material 11 according to another preferred embodiment of the present invention. The card base material 11 of this embodiment has a plurality of polyvinyl chloride sheets (three sheets in this example). ) formed by laminating, a center core 12 containing a white pigment (e.g., white rigid poly transparent polyvinyl chloride layer on at least one surface of the vinyl chloride resins) 13 having a thickness of 0.1 to 0.8 mm ' It is a laminate.

By laminating a plurality of polyvinyl chloride sheets in this manner, curling of the card base material during image formation or at other times can be favorably prevented. In particular, as shown in FIG. Transparent layers 13, 13 'on both sides
Good curl prevention can be obtained by laminating. Further, by forming at least the dye receiving surface as the transparent layer 13, the image has a good depth and three-dimensional appearance, and since it does not contain a pigment, it has a high luster and does not feel grainy.

[0020] At least one 13 of the (dye-receiving surface) as described above specific weight plasticizer及 BiNamera of the transparent layer 13, 13 '
And has good dyeing properties for dyes. In this example, the center core 12 does not necessarily need to contain a predetermined amount of plasticizer, and
Between the transparent layers 13 and 13 '
Can be formed in advance. Although centers <br/> core 12 in this example is sandwiched by the transparent layer 13, 13 ', these transparent layer may be only on one surface.

Although the characteristic portion of the card base material used in the present invention has been described above, when the card base material is used, other recording, for example, a magnetic recording layer, an optical A memory, a sign, an IC memory, a barcode, and the like can be provided.

Next, the card manufacturing method of the present invention using the above card substrate will be described. The method for manufacturing a card of the present invention is basically the same as that described with reference to FIGS. 1 to 3. However, when a card is formed using a sublimable heat transfer sheet,
It is easy and beautiful to form toned images such as portraits and landscapes, but images such as symbols such as characters and barcodes lack density and sharpness, and are readable by infrared.
There is a problem that R characters and bar codes cannot be formed.

In the present invention, such a drawback can be solved by using a thermal transfer sheet of a molten ink transfer type in addition to a thermal transfer sheet of a sublimation type. The configurations of the sublimation type thermal transfer sheet and the fusion type thermal transfer sheet are the same as those of the sublimation type thermal transfer sheet and the fusion type thermal transfer sheet of the composite thermal transfer sheet of a preferred embodiment described later, respectively, and thus description thereof is omitted here. I do.

The above two types of thermal transfer sheets may be different from each other. However, this method has a problem that the operation is complicated. Therefore, a sublimation-type heat transfer sheet is placed on one continuous base film. It is preferable to use a thermal transfer sheet in which a thermal transfer layer and a thermal transfer layer of the molten ink transfer type are provided in a plane-sequential manner. According to such a composite thermal transfer sheet, a gradation image such as a face photograph and a monotone image such as characters and symbols can be simultaneously and satisfactorily formed. The configuration of the composite thermal transfer sheet is also the same as the configuration of the composite thermal transfer sheet including a protective layer described later, and thus the details are omitted.

Further, even when the composite type thermal transfer sheet is used, there is a problem that the durability of an image is insufficient in applications requiring various durability, particularly, abrasion resistance such as an ID card. In the present invention, such a problem can be solved by laminating a transparent protective layer on the surface of an image as shown in FIG. Lamination of the protective layer can be performed by applying and drying a transparent paint, laminating a transparent film, and further using a thermal transfer sheet for the protective layer. The configuration of the protective layer thermal transfer sheet is also the same as that of the protective layer portion of the composite thermal transfer sheet described later, and the description is omitted here.

In a preferred embodiment of the present invention, a thermal transfer sheet is used which is provided with a sublimable dye layer of at least one color, a heat-meltable ink layer of at least one color, and a release protective layer on a base film in a sequential manner. By doing so, the gradation image, the monotonic image and the transparent protective layer can be formed on the same thermal transfer sheet.

Next, a particularly preferred embodiment will be described more specifically with reference to the accompanying drawings. FIG. 4 is a diagram schematically showing a cross section of the composite thermal transfer sheet according to a preferred embodiment, and FIG. 6 is a plan view thereof. The composite thermal transfer sheet of this embodiment has a sublimation dye layer 2Y, 2M and 2 formed of yellow, magenta and cyan hue regions on a base film 1.
C, a black hot-melt ink layer 3 and a release protective layer 4 are formed in a plane-sequential manner.

First, the common part will be described. As the base film 1 of the composite thermal transfer sheet, the same base film as used in the conventional thermal transfer sheet can be used as it is, and other materials can be used. And is not particularly limited. Specific examples of preferred base film 1 include, for example, glassine paper, condenser paper,
Thin paper such as paraffin paper is useful, and in addition, for example, plastics such as polyester, polypropylene, cellophane, polycarbonate, cellulose acetate, polyethylene, polyvinyl chloride, polystyrene, nylon, polyimide, polyvinylidene chloride, ionomer, and the like. A base film composited with the paper is exemplified. The thickness of the substrate film 1 can be appropriately changed depending on the material so that the strength and heat resistance are appropriate, but the thickness is preferably 3 to 100 μm.
It is.

Reference numeral 6 denotes a back layer, which has a function of preventing adhesion of a thermal head of a printer. This layer 6 is also unnecessary when the heat resistance and the slip property of the base film 1 are good. Reference numeral 7 denotes an adhesion improving layer, which has an effect of improving the adhesion of the sublimable dye layer 2 and the release layer 5 to the base film 1. In addition, the adhesion improving layer 7
It has an effect of improving the adhesiveness between the peeling protective layer 4 and the base film 1 and improving the breakage of the foil of the peeling protective layer 4. This layer 7
If the adhesiveness between the base film 1 and the release protective layer 4 is poor without providing the protective film 4, the protective layer 4 other than the heated portion is peeled off together with the protective layer 4 in the heated portion during thermal transfer, and the foil is cut poorly. .

The adhesion improving layer 7 may be any as long as the adhesion between the base film 1 and the dye layer 2, the release layer 5 and the release protective layer 4 can be further strengthened. For example, polyurethane resin, acrylic polyol resin, It is formed by coating or drying a vinyl chloride / vinyl acetate copolymer or the like alone or as a mixture. If necessary, a reactive curing agent such as polyisocyanate may be added, and a titanate or silane coupling agent may be used. 2 if necessary
More than one layer may be stacked.

Numerals 8 and 8 'denote a heat-sensitive adhesive layer, which has an effect of facilitating transfer of the hot-melt ink layer 3 and / or the release protective layer 4 to the card substrate. Since the card base is made of polyvinyl chloride, the heat-sensitive adhesive layers 8, 8 'have good adhesive properties with the vinyl chloride resin, such as acrylic resin, vinyl chloride resin, and vinyl chloride / vinyl acetate. By applying and drying a solution of a resin having good adhesiveness when heated, such as a copolymer resin, an acrylic / vinyl chloride / vinyl acetate copolymer, a polyester resin, and a polyamide resin, preferably about 0.5 to 10 μm Formed to a thickness of Among these resins, those having good adhesiveness to vinyl chloride resin and good foil breakage include vinyl chloride / vinyl acetate copolymer, acrylic / vinyl chloride / vinyl acetate copolymer, acrylic resin and polyamide resin. is there.

Next, each thermal transfer layer will be described. The dye layer 2 is a layer in which a sublimable dye is carried on the base film 1 (adhesion improving layer 7) with an optional binder resin. As the dye to be used, any dye conventionally used in a sublimation type thermal transfer sheet can be effectively used in the present invention, and is not particularly limited. For example, some preferred dyes include, as red dyes, MS Red G, Macrolex
Red Violet R, Ceres Red 7B, Samaron Red HBSL, SK
Rubin SEGL and the like, and as the yellow dye, Holon Brilliant Yellow S-6GL, PTY-52, Macrolex Yellow S-6G, etc., and as the blue dye, Kayaset Blue 714, wax Sorin Blue AP-FW,
Holon Brilliant Blue SR, MS Blue 100, Daito Blue No. 1 and the like.

As the binder for supporting the dye as described above, any of those conventionally known can be used. Preferred examples thereof include ethyl cellulose, hydroxyethyl cellulose, ethyl hydroxycellulose, hydroxypropyl cellulose, methyl cellulose, and cellulose acetate. Cellulose resins such as cellulose acetate butyrate, polyvinyl alcohol, polyvinyl acetate, polyvinyl butyral, polyvinyl acetal, polyvinyl pyrrolidone,
Examples thereof include vinyl resins such as polyacrylamide, and polyvinyl acetal and polyvinyl butyral are particularly preferable in terms of heat resistance, heat transfer properties of dyes, and the like. The dye layer 2 is basically formed from the above-described materials, but may further include various conventionally known additives as necessary.

Such a dye layer 2 is preferably prepared by adding the above-mentioned dye, binder resin and other optional components in an appropriate solvent and dissolving or dispersing each component to prepare an ink for forming a dye layer. Is formed on the base film 1 by a gravure printing method or the like and dried. Of course, the printing may be performed in a single color, but for the purpose of the present invention, a multicolor printing of three colors of yellow, magenta, and cyan or four colors including black is preferable so that a color image can be formed.

The dye layer 2 thus formed has a thickness of 0.2
The dye in the dye layer 2 has a thickness of 5 to 90% by weight, preferably 10 to 70% by weight of the dye layer. It is preferably present in an amount. The hot-melt ink layer 3 is formed adjacent to the dye layer 2 from an ink containing necessary materials. The ink for forming the hot-melt ink layer comprises a colorant and a vehicle, and may further contain various additives as necessary. As the above-mentioned colorant, among organic or inorganic pigments or dyes, those having good properties as a recording material, for example, those having a sufficient coloring density and not discoloring by light, heat, temperature or the like are preferable. As the colorant, cyan, magenta, yellow and the like can be used, but for the purpose of the present invention, a black colorant capable of printing clear characters and symbols at high density is preferable.

As the vehicle, a mixture containing wax as a main component and other derivatives of wax, such as drying oil, resin, mineral oil, cellulose and rubber, is used. Representative examples of the wax include microcrystalline wax, carnauba wax, and paraffin wax. In addition, Fischer-Tropsch wax, various low molecular weight polyethylenes, wood wax, beeswax, whale wax, Ibota wax,
Wool wax, shellac wax, candelilla wax,
Petrolactam, partially modified wax, fatty acid ester,
Various waxes such as fatty acid amides are used.

However, it is more preferable to use the following resin binder from the viewpoint of adhesion to a polyvinyl chloride card substrate and scratch resistance. Acrylic resin Acrylic resin + Chloride rubber Acrylic resin + Vinyl chloride / vinyl acetate copolymer resin Acrylic resin + Cellulose resin Vinyl chloride / vinyl acetate copolymer resin

The method for forming the hot-melt ink layer 3 on the base film 1 or on the release layer 5 previously provided on the base film 1 includes, in addition to a hot melt coat, a hot lacquer coat,
A gravure coat, a gravure reverse coat, a roll coat, a method of applying the above-mentioned ink by various means, and the like can be mentioned. The thickness of the ink layer to be formed should be determined so as to balance the required density with the thermal sensitivity. For example, the thickness of the ink layer is usually preferably in the range of about 0.2 to 10 μm.

Prior to the formation of the hot-melt ink layer,
In order to facilitate the peeling of the ink layer, it is preferable to form a peeling layer 5 on the surface of the adhesion improving layer 7 of the base film 1. The release layer 5 is formed from a release agent such as waxes, silicone wax, silicone resin, fluorine resin, acrylic resin, cellulose resin, vinyl chloride / vinyl acetate copolymer resin, and nitrified cotton resin as described above. The forming method may be the same as the method for forming the sublimable dye layer or the hot-melt ink layer, and the thickness of about 0.1 to 5 μm is sufficient.
If a matte print or matte protective layer is desired after transfer, the release layer 5 can be made to contain various particles to form a matte surface. The layers 5 to 8 are not essential in the present invention, but when the adhesion improving layer 7 is provided, the release layer 5 is preferably provided.

On the adhesion improving layer 7, a release protective layer 4 made of a wax-containing transparent resin layer and a heat-sensitive adhesive layer 8 'are provided in a releasable manner. The release protection layer 4 provided on the adhesion improving layer 7 is preferably formed from a mixture of a transparent resin and wax. Examples of the transparent resin include a polyester resin, a polystyrene resin, an acrylic resin, an epoxy resin, a modified cellulose resin, a polyvinyl acetal resin, a silicone resin, a fluorine resin, and the like. Particularly preferred are an acrylic resin, a silicone resin, and a fluorine resin. . These resins have excellent transparency and form a relatively tough film.
In addition, film breakage during transfer is sufficient. However, since the lubricity is insufficient, it is easily damaged by surface friction. In the present invention, the lubricity of the protective layer 4 is improved by mixing wax with these transparent resins.

Representative examples of the wax used in the present invention include microcrystalline wax, carnauba wax, paraffin wax and the like. In addition, Fischer-Tropsch wax, various low molecular weight polyethylenes, wood wax, beeswax, whale wax, Ibota wax, wool wax, shellac wax, candelilla wax, petrolactam,
Various waxes such as partially modified waxes, fatty acid esters, and fatty acid amides are used.

The amount of the wax used is determined by the amount of the transparent resin 1
The amount is preferably in the range of 0.5 to 20 parts by weight per 00 parts by weight. If the amount of the wax is too small, the abrasion resistance of the protective layer 4 becomes insufficient. It is not preferable because transparency becomes insufficient.

The method of mixing the above transparent resin and wax is as follows:
There is no particular limitation on the mixing method, such as a method of melting and mixing both, and a method of dissolving and mixing in an appropriate organic solvent that dissolves both. It is particularly preferable to use a transparent resin as a dispersion (or an emulsion), while using wax as a solution or a dispersion (an emulsion), and to mix both. After using such a dispersion liquid (emulsion liquid) and applying it to a base film, drying is performed at a relatively low temperature to form a film so that at least a part of these resin particles remains. The coating thus formed has a rough surface due to the remaining resin particles and is partially cloudy, but the surface becomes smooth by heat and pressure during thermal transfer and can be transferred as a transparent coating.

As a method for forming the release protective layer 4, a method of applying and drying an ink composed of the above resin and wax by a gravure coat, a gravure reverse coat, a roll coat and other various means can be mentioned. When the release protection layer 4 is formed from a mixed dispersion of a resin and a wax, drying after coating may be performed at a temperature lower than the melting point of the resin particles, for example, at a relatively low temperature of about 50 to 100 ° C. preferable. By drying at such a temperature, the film is formed with the resin particles remaining, so that the film breakage of the protective layer 4 during thermal transfer is significantly improved, and the smoothness of the protective layer is maintained.

The release protective layer 4 may contain substantially transparent inorganic or organic fine particles. By mixing such fine particles, it is possible to further improve the breaking of the foil and the abrasion resistance of the peeling protective layer. Further, the surface gloss of the protective layer 4 can be suppressed, and a matte surface can be obtained. Preferred examples of such fine particles include silica,
Teflon powder, nylon powder and the like having relatively high transparency can be used. The added amount of these fine particles is preferably 1 to 30% by weight based on the resin of the protective layer 4. If the amount is too large, the transparency and durability of the protective layer will be reduced. The release protective layer 4 and / or the heat-sensitive adhesive layer 8 'may contain additives such as an ultraviolet absorber, an antioxidant, or a fluorescent whitening agent so that the gloss of various images to be coated can be improved. Light resistance, weather resistance, whiteness and the like can be improved.

The image to be protected by using the thermal transfer sheet including the protective layer as described above may be a gradation image formed on the card substrate by a sublimation type thermal transfer method, or a character or bar code by a fused ink type thermal transfer method. Monotone images such as symbols are preferred, but not limited to these images. Particularly when applied to a sublimation transfer image, the protective layer of the image is formed, and the dye forming the image is recolored by heat during transfer, so that the image is further sharpened. There is.

As described above, the composite thermal transfer sheet is provided, but the forming method is not limited to these methods, and the order of forming the sublimable dye layer, the hot-melt ink layer, the release protective layer and the like is not particularly limited. . Further, the sublimable dye layer, the hot-melt ink layer, and the release protection layer may be provided in a pattern at a specific position of the base film corresponding to a position where a transfer image of the transfer-receiving material is to be formed. As shown in FIG. 7, the sublimable dye layer 2, the heat-meltable ink layer 3, and the release protective layer 4 can be applied to specific positions corresponding to the positions where the transfer image of the transfer material is to be formed. In this way, it is possible to prevent background contamination of the card base material and to remove unused portions of these layers, which is economical.

An example of manufacturing a card using the composite thermal transfer sheet will be described with reference to FIG. First, the dye layer 2Y of the thermal transfer sheet is overlaid on the surface of the card substrate 9, and the yellow image 2Y is transferred by a thermal printer that operates according to a color separation signal. Similarly, a magenta image 2M is placed in the same area.
Then, the desired color image 10 is formed by transferring the cyan image 2C.

Next, desired characters, symbols and the like 3 are similarly printed using the heat-meltable ink layer 3. Further, the protective layer 4 is transferred onto the color image 10 and / or the image 3 such as a character by using the transfer protective layer 4 to form the protective layer 4. Thus, a desired card is obtained. In the above transfer, the thermal printer may be set separately (preferably continuously) for sublimation transfer, for hot-melt ink transfer, and for protection layer transfer. The printing energy may be appropriately adjusted by each of the printers.
Although the present invention has been described with reference to the preferred embodiment using the composite thermal transfer sheet, the present invention is not limited to this example, and it is natural that the gradation image, the monotonic image, and the protective layer may be formed separately. is there.

[0050]

EXAMPLES Next , the present invention will be described more specifically with reference to Reference Examples, Examples and Comparative Examples. In the description, parts and% are based on weight unless otherwise specified. Reference Example 1, Examples 1 to 4 and Comparative Examples 1 to 3 White card substrates (0.2 mm thick, size 10 × 20 cm) of Reference Examples, the present invention, and Comparative Examples according to the compositions shown in Table 1 below.
It was created.

[0051]

3 containing each of the three sublimable dyes of the following composition:
A color ink was prepared. 89. Yellow ink disperse dye (Macrolex Yellow 6G, CIDisperse Yellow 201, manufactured by Bayer AG) 5.5 parts Polyvinyl butyral resin (Eslec BX-1, manufactured by Sekisui Chemical) 4.5 parts Methyl ethyl ketone / toluene (1/1 by weight) 0 parts magenta disperse dye (CIDisperse Red 60) as magenta ink dye
Same as yellow ink except using. Same as yellow ink except for using cyan disperse dye (CISolvent Blue 63) as cyan ink dye.

A heat-resistant slip layer (thickness: 1 μm) was formed on the back surface of the above ink composition by a gravure coating method.
And adhesive improving layer made of polyurethane resin on the surface on the surface of the thickness 4.5μm polyester film that is formed (thickness 0.5 [mu] m), as the coating amount of about 3 g / m ^2, respectively yellow, Magenta and cyan were repeatedly applied and dried to a width of 15 cm sequentially in the order of magenta and cyan to form a thermal transfer sheet including sublimable dye layers of three colors.

The above-described sublimation thermal transfer sheet is superimposed on the surface of the card substrate, and thermal energy is applied by a thermal head connected to an electric signal obtained by color separation of a face photograph, and sublimation transfer is performed in the order of cyan, magenta and yellow. Was performed to form a full-color face photograph. Next, a release layer ink having the following composition was applied to the surface of the same polyester film as described above by a gravure coating method at a ratio of 1 g / m ^{2 on} a solid content basis and dried to form a release layer.

Ink for release layer 20 parts Acrylic resin 100 parts Methyl ethyl ketone 100 parts Toluene 100 parts Next, the following ink is applied to the surface of the release layer by a gravure coating method so as to have an application amount of about 3 g / m ² and dried. Thus, a heat-fusible ink layer was formed to prepare a heat-fusible thermal transfer sheet.

Hot-melt ink Acrylic / vinyl chloride / vinyl acetate copolymer resin 20 parts Carbon black 10 parts Toluene 35 parts Methyl ethyl ketone 35 parts

The sublimation thermal transfer sheet was superimposed on the image blank of the card on which the face photograph was formed, and characters such as numerals, kanji, and symbol images such as bar codes were formed. The color density, sharpness, and blocking state of the transfer sheet at the time of sublimation transfer were examined for the card photographs of the reference examples, the present invention, and the comparative examples obtained above, and the results in Table 2 below were obtained.

[0058]

* 1: The dye layer of the thermal transfer sheet is partially transferred as it is, and the resolution is extremely poor. * 2: Blurring occurs in the image, resulting in poor resolution. The color development densities were compared with the naked eye. The highest density was indicated by ◎, the medium density was indicated by 、, and the poor density was indicated by x. The sharpness was compared with the naked eye, and the sharpest was represented by ◎, the medium one was represented by ○, and the poor one was represented by ×. Regarding the blocking resistance, ◎ indicates that the transfer sheet was easily peeled off after sublimation transfer, ○ indicates that the transfer sheet was slightly difficult, and X indicates that the dye layer itself was difficult to peel and transferred to the card substrate.

Examples 5 to 8 and Comparative Examples 4 to 6 A white card base core (0.2 m thick) having the following composition
m, size 30 × 30 cm). Polyvinyl chloride (degree of polymerization: 800) compound containing about 10% of additives such as stabilizers 100 parts White pigment (titanium oxide) 15 parts Next, a transparent sheet (thickness 0.15) was prepared according to the composition shown in Table 3 below.
mm) and thermocompression-bonded to both surfaces of the white core to prepare card base materials of Examples and Comparative Examples.

[0061] When a gradation image and a monotone transfer image were formed on the surface of the card substrate in the same manner as in Reference Example 1 and the same performance was examined,
The same results as in Table 2 were obtained.

[0062]

[0063]

[0064]

[0065]

[0067]

[0068]

[0069]

[0070]

[0071]

[0072]

[0073]

[0074]

[0075]

[0076]

[0077]

[0078]

[0079]

According to the above-described present invention, the dye-receiving surface of the polyvinyl chloride-made card substrate in JP quantitative plasticizer及 BiNamera
By incorporating the agent, any image can be formed by the sublimation transfer method without having to form any special dye receiving layer on the surface, so that the complexity of attaching a face photograph and forming the dye receiving layer is reduced. It has been eliminated. Further, in a preferred embodiment, by a card substrate and the laminated type, both the excellent image can be formed, it is possible to effectively prevent curling. Further, according to the method of the present invention, both the conveniently card can provide, gradation image and minor property image can be formed at the same time, further it is possible to impart a readily transparent protective layer on these images.

[Brief description of the drawings]

FIG. 1 is a diagram schematically illustrating a cross section of a card base material used in the present invention and a cross section after image formation.

FIG. 2 is a diagram schematically illustrating a cross section of a card base material used in the present invention and a cross section after image formation.

FIG. 3 is a diagram schematically illustrating a cross section of a card base material used in the present invention and a cross section after image formation.

FIG. 4 is a diagram schematically illustrating a cross section of the composite thermal transfer film used in the present invention.

FIG. 5 is a diagram schematically illustrating a cross section of a card created by the present invention.

FIG. 6 is a plan view of FIG. 1;

FIG. 7 is a plan view of another example of the composite thermal transfer film. FIG. 7 shows an example in which the sublimable dye layer 2, the heat-meltable ink layer 3, and the transferable protective layer are separately applied to specific positions corresponding to the portions of the transfer material on which the transfer image is to be formed.

DESCRIPTION OF SYMBOLS FIGS. 1 to 3 : A: Sublimation thermal transfer sheet 1: Card base material 2: Dye layer 3: Thermal head 4: Transfer image 5: Embossed pattern 6: Printing pattern 7: Transparent protective layer 11: Card base Material 12: Center core 13, 13 ': Transparent layer FIGS. 4 to 7 : 1: Base film 2: Sublimable dye layer 3: Hot-melt ink layer 4: Protective layer 5: Release layer 6: Back layer 7: Adhesion improving layer 8: Heat-sensitive adhesive layer 9: Card base material 10: Color image

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor: Mitsuhiko Ando 1-1-1, Ichigaya-Kaga-cho, Shinjuku-ku, Tokyo Dai Nippon Printing Co., Ltd. (56) References JP-A-52-143107 (JP, A) JP-A-51-115000 (JP, A) JP-A-63-9574 (JP, A) JP-A-2-1533791 (JP, A) JP-A-58-96592 (JP, A) JP-A-64-5886 (JP JP, A) Japanese Utility Model Showa 64-30270 (JP, U) Japanese Utility Model Showa 63-119076 (JP, U)

Claims (1)

(57) [Claims] 1. 0.1 parts by weight per 100 parts by weight of polyvinyl chloride
A full-color gradation image and a monotone image are formed on at least one surface of a polyvinyl chloride card base material containing from 0.1 to 10 parts by weight of a plasticizer and from 0.1 to 5 parts by weight of a lubricant. ,
A card, wherein the full-color gradation image is an image formed of a dye formed by a sublimation type thermal transfer system, and the monotone image is an image formed of a pigment ink formed by a heat melting type thermal transfer system.