JP2737585B2 - Transferred sheet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has an image pattern formed by sublimation transfer means based on image data and a fine print pattern, and is used, for example, in an image display device applied to an ID card or the like. Related to the seat.

[0002]

2. Description of the Related Art An image pattern is formed on an image receiving layer of a transfer sheet based on image data by sublimation transfer means, and at least the image receiving layer of the transfer sheet is transferred to the surface of an image display (object) by a thermal transfer method. There is known a method of forming an image by using the method described in Japanese Patent Application Laid-Open No. 63-81093.

Hereinafter, the above method will be described in detail. The basic structure of the transfer sheet used in this method is that an image receiving layer made of a thermoplastic resin that can be dyed with at least a sublimable (heat-migrating) dye is provided on one surface of an arbitrary sheet-like substrate. It is a thing.

[0004] The image receiving layer of the transfer-receiving sheet as described above is brought into contact with the dye layer of a dye film in which the colorant is a sublimable dye, and a thermal head is pressed from the dye film side to generate an electric signal based on image data. By applying and heating the head, the dye layer is partially transferred to the image receiving layer to form an image pattern. When the image data is multicolor, a multicolor image pattern is formed on the transfer-receiving sheet by repeating the same process using dye films having different color tones.

[0005] The transfer sheet on which the image pattern is formed by the above process is brought into contact with the surface of the image display body, and a heating medium such as a heat roll or a hot plate is pressed and heated from the transfer sheet side to at least the image receiving layer. Is thermally transferred to an image display. In this case, since the image receiving layer is made of a thermoplastic resin, it also functions as an adhesive.

[0006] The above method has the effect that the image pattern is formed with a sublimable dye, so that the image is clear and the image can be formed without any particular choice of the image forming body.

However, when performing the above method,
The selection of the material for the image receiving layer of the transfer receiving sheet becomes a problem. In other words, in the step of forming an image pattern, the image-receiving layer is transferred (heat-fused) to the dye film side when the thermoplastic resin of the image-receiving layer has a low thermal melting temperature because the image-receiving layer is heated while being in contact with the dye film. There is a risk that it will. In order to prevent the transfer, it is conceivable to use a thermoplastic resin having a high heat melting temperature for the image receiving layer.However, in the process of transferring the image receiving layer to the image display, the temperature of the heating medium must be increased, and (Discoloration) of the image pattern composed of, and damage to the image display body due to heat. Further, it is conceivable to mix an additive such as silicon into the image receiving layer in order to lower the adhesiveness to the dye film. However, in this case, there is a problem that the adhesiveness to the image display is deteriorated.

On the other hand, since the image display body created by the above method has image data, it is assumed that the image display body is applied to an ID card such as an identification card, for example. No consideration is given to prevention.

[0009]

SUMMARY OF THE INVENTION Accordingly, the present invention is directed to a method for deteriorating (fading) an image pattern formed by a sublimable dye.
It is an object of the present invention to provide a transfer sheet used for manufacturing an image display body which is less damaged by heat and heat and in which forgery (falsification) of image data is difficult.

[0010]

In order to achieve the above object, according to the first aspect of the present invention, a release layer and an image receiving layer / adhesive layer which are easily peeled from the heat-resistant base film are sequentially laminated on the heat-resistant base film. And a transfer sheet provided with a fine print layer between the release layer and the image-receiving / adhesive layer.

According to a second aspect of the present invention, a release layer which is easy to release from the base film, a sublimation dye diffusion preventing layer, and an image receiving layer / adhesive layer are sequentially laminated on the heat resistant base film. And a fine print layer provided between the release layer and the diffusion preventing layer or between the diffusion preventing layer and the image receiving layer / adhesive layer.

Further, the invention according to claim 3 is the transfer receiving sheet, wherein the fine print layer is printed with a fluorescent ink, an infrared absorbing ink or a magnetic ink.

According to a fourth aspect of the present invention, in the transfer sheet, the release layer is made of a friction-resistant agent and a thermoplastic resin, and the thermoplastic resin is polymethyl methacrylate or an epoxy resin. It is.

According to a fifth aspect of the present invention, the image receiving layer / adhesive layer is made of an ultraviolet absorbent and a thermoplastic resin having a glass transition point of 50 ° C. or higher.
The above-mentioned transfer receiving sheet is provided.

Further, the invention according to claim 6 is the above-mentioned transfer-receiving sheet, wherein the diffusion preventing layer of the sublimable dye is nitrocellulose.

[0016]

As described above, the sheet to be transferred according to the present invention has a filler in the image-receiving layer / adhesive layer, so that the thermoplastic resin in the image-receiving layer / adhesive layer has a low thermal melting temperature. Even in the step of forming an image pattern, there is no possibility that the image receiving layer / adhesive layer will be transferred to the dye film side, and since it is not necessary to use an additive such as silicon, the The adhesion is also good. Further, since the thermoplastic resin in the image receiving layer and the adhesive layer has a glass transition point of 50 ° C. or higher, there is no image change due to heat.

Further, in an image forming body manufactured by transferring a portion below a release layer of a transfer-receiving sheet, a fine pattern is formed on an image pattern formed of a sublimable dye. Therefore, it is difficult to falsify the image without losing the fine print pattern. If the diffusion preventing layer is nitrocellulose, the diffusion of the image dyed with the sublimable dye to the outside can be prevented.

Further, when an ultraviolet absorber is contained in the image-receiving layer / adhesive layer, discoloration due to light such as ultraviolet rays can be prevented.

If the release layer is a mixture of a friction-resistant agent and a thermoplastic resin, the release layer can be easily peeled off from the base film during thermal transfer, thereby preventing external chemical and mechanical damage of the image due to the dye.

The transfer sheet (1) according to the first aspect comprises a base film (11) and a release layer (1) as shown in FIG.
2), fine print layer (15) and image-receiving layer / adhesive layer (1)
4). The sheet to be transferred (1) according to claim 2 is
As shown in FIGS. 2 and 3, the base film (11), the release layer (12), the fine print layer (15), and the diffusion prevention layer (13)
And an image receiving layer / adhesive layer (14) or a base film (11), a release layer (12), a diffusion preventing layer (13), a fine print layer (15), and an image receiving layer / adhesive layer (14).

The base film (11) needs to have heat resistance so as not to be softened and deformed by heat and pressure during transfer. Such a base film (11) is known, and has a thickness of, for example, 3 to 50 μm.
The biaxially stretched polyethylene terephthalate film can be used.

The release layer (12) needs to be easily released from the base film (11) during thermal transfer. Further, it is necessary to fulfill the function of the protective film after the transfer.
The function of the protective film is to prevent external chemical and mechanical damage of the image due to the dye. In order to satisfy both functions, a mixture of a friction-resistant agent and a thermoplastic resin may be used.

The thermoplastic resin prevents permeation of plasticizers and chemicals and reduces scratches due to scratching.
As such a thermoplastic resin, polymethyl methacrylate or an epoxy resin can be used. Methyl methacrylate and epoxy resin have excellent plasticizer resistance among existing thermoplastic resins and are easily peeled off from the base film (11). By using these resins for the release layer (12), it is possible to prevent the migration of the plasticizer contained in a soft vinyl chloride sheet or a plastic eraser when the transferred image is brought into contact with the image. In addition, penetration of chemicals such as acids, alkalis, alcohols, and kerosene can be prevented, and the effect on images can be prevented.

The anti-friction agent is added to improve abrasion resistance and scratch resistance. For example, natural waxes such as Teflon powder, polyethylene powder, animal wax, plant wax, mineral wax, petroleum wax, synthetic hydrocarbon wax, aliphatic alcohol and acid wax, fatty acid ester and glycerite wax, hydrogen Waxes, synthetic ketone waxes, amine and amide waxes, chlorinated hydrocarbon waxes, synthetic animal wax waxes, synthetic waxes such as alpha-olefin waxes, and metal salts of higher fatty acids such as zinc stearate. be able to.

The release layer (12) is composed of the thermoplastic resin 85 to 9 based on 100 parts by weight of the total of the thermoplastic resin and the anti-friction agent.
5 parts by weight and 5 to 15 parts by weight of the anti-friction agent may be used. The coating amount may be 1 to 3 g / m ² .

In addition to the above components, a release improving agent can be mixed in the release layer (12) in order to improve cutting during transfer. For example, a linear saturated polyester resin. However, it should be limited to 0 to 10 parts by weight based on 100 parts by weight of the total amount of the thermoplastic resin and the anti-friction agent.

It is desirable that no other additives such as an ultraviolet absorber be added to the release layer (12). This is because the addition lowers the chemical resistance or facilitates the penetration of the plasticizer, which causes the mechanical strength of the release layer to deteriorate.

The method for coating the release layer is as follows. First, the release layer composition is formed into a coating with an appropriate solvent, and the coating is dried by a coating method such as gravure coating, roll coating coating, or bar coating. What is necessary is just to form.

The diffusion preventing layer (13) of the sublimable dye is provided as necessary in order to prevent the image dyed with the sublimable dye on the surface of the plastic such as polyvinyl chloride from diffusing to the outside. In order to prevent the diffusion of the sublimable dye, a natural polymer such as cellulose or a hydrophilic polymer obtained by modifying the same is applied, and the adhesiveness with a normal thermoplastic resin, heat resistance, Considering water resistance, nitrocellulose is optimal.

If the diffusion preventing layer (13) is not provided, the release layer (1) is interposed via the image receiving layer / adhesive layer (14) during long-term storage.
If the dye diffuses up to 2) and is sandwiched between an eraser and a soft PVC containing a plasticizer or the like, the dye is diffused and transferred to the eraser or the soft PVC or the like, which causes image fading.

The diffusion transfer layer (13) has no role as the image receiving layer / adhesion layer (14). Because nitrocellulose has heat resistance, it does not adhere to the substrate during thermal transfer. The diffusion transfer layer (13) is a simple hydrophilic polymer such as nitrocellulose, and the coating amount is 0.5 to 1.5 g /
m may be the ^2.

The method for coating the diffusion transfer layer (13) is as follows. First, the release layer composition is formed into a paint with a suitable solvent, and the paint is applied by a coating method such as gravure coating, roll coating, or bar coating. It may be dried.

The image receiving layer / adhesive layer (14) forms an image pattern and adheres to the surface of an image forming body made of a plastic material or the like. For this reason, it is composed of a mixture of a thermoplastic resin and a filler.

As the thermoplastic resin used for the image receiving layer and the adhesive layer (14), those having a glass transition point (Tg) of 50 ° C. or more can be used. When a resin having a glass transition point temperature of less than 50 ° C. is used, after the transfer, the resin causes migration of a dye, thereby causing image bleeding. Further, those having a glass transition point of 110 ° C. or lower are preferred. When a resin having a glass transition point exceeding 110 ° C. is used, a high temperature is required at the time of transfer, a load is applied to a thermal head, and a plastic material such as a polyvinyl chloride card may be deformed by heat.

Examples of the thermoplastic resin used for the image receiving layer / adhesive layer (14) include polyesters such as linear saturated polyesters, vinyl chloride resins such as polyvinyl chloride and vinyl chloride-vinyl acetate copolymer resin, and polyvinyl chloride resins. Acrylic acid, 2-methoxyethyl polyacrylate, polymethyl acrylate, 2-naphthyl polyacrylate, isobornyl polyacrylate, polymethacrylomethyl, polyacrylonitrile, polymethyl chloroacrylate, polymethyl methacrylate, polymethacryl Acrylic resins such as ethyl acrylate, poly-tert-butyl methacrylate, polyisobutyl methacrylate, polyphenyl methacrylate, and copolymer resins of methyl methacrylate and alkyl methacrylate (where the alkyl group has 2 to 6 carbon atoms); Polystyrene, polydivinyl Benzene, polyvinyl benzene, styrene - butadiene copolymer resin, styrene-alkyl methacrylate (carbon number of wherein the alkyl group is 1 to 6) or the like vinyl resin, such as.

When a sublimation transfer image is transferred to the surface of the image receiving layer / adhesive layer (14) by a thermal head via a dye film, the main component of the image receiving layer / adhesive layer (14) is a thermoplastic resin. The image receiving layer / adhesive layer (14) is thermally fused to the dye layer of the dye film due to the heat of the thermal head, and a clear image pattern cannot be obtained. Therefore, an inorganic or organic filler having a hot-melting temperature (softening point or decomposition point in the case of an organic filler, melting point in the case of an inorganic filler) of 200 ° C. or more is contained in the image-receiving layer / adhesive layer (14). Add to prevent thermal fusion.

Examples of the organic filler include polytetrafluoroethylene fine particles, starch, silicone resin fine particles, polyacrylonitrile fine particles, and cured resin fine particles made from benzoguanamine resin and melamine resin. Calcium carbonate, talc,
Kaolin, zinc oxide, titanium oxide, silicon oxide, aluminum hydroxide, magnesium oxide and the like.

The amount of the image-receiving layer / adhesive layer (14) may be 1 to 20 parts by weight based on 100 parts by weight of the thermoplastic resin. The coating amount is preferably 1 to 3 g / m ² .

An ultraviolet absorber contained in the image-receiving layer / adhesive layer (14) as necessary prevents the dye from discoloring and discoloring due to light. That is, ultraviolet rays having a wavelength of 250 to 400 nm are absorbed and the energy is re-emitted as heat energy harmless to the dye, and the ultraviolet absorbent itself does not change at all. For this reason, an ultraviolet absorber having a maximum absorption wavelength of 250 to 400 nm is used.

For example, phenyl salicylate, p-ter
salicylic acid-based ultraviolet absorbers such as t-butylphenyl salicylate and p-octylphenyl salicylate;
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-methoxy-
Benzophenone-based ultraviolet absorbers such as 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-butylphenyl) -5-chlorobenzotriazole, 2-
Benzotriazole-based ultraviolet absorbers such as (2'-hydroxy-3 ', 5'-ditert-amylphenyl) benzotriazole, 2-ethylhexyl-2-cyano-
It is a cyanoacrylate-based ultraviolet absorber such as 3,3'-diphenylacrylate and ethyl-2-cyano-3,3-diphenylacrylate.

The UV absorber may be used in an amount of 5 to 40 parts by weight based on 100 parts by weight of the mixture comprising the thermoplastic resin and the filler.

The method for coating the image-receiving layer / adhesive layer is as follows. First, the image-receiving layer / adhesive layer composition is formed into a paint with a suitable solvent, and the paint is applied by a gravure coating, a roll coating coating, a bar coating coating, or the like. May be formed by coating and drying.

The method of providing the fine print layer (15) can be easily provided between the respective layers by printing such as offset printing or gravure printing when manufacturing the transfer foil. However, as for the color of the fine print, a light color that is inconspicuous is desirable because it should not become an obstacle to visually recognize images such as characters and face photographs in the lower layer of the fine print. As the shape of the fine print, a repetitive pattern of a precise and regular line figure or a pattern in which a logo, a trademark, or the like indicating a card issuer is combined with the pattern is generally used. In order to further improve the effect of preventing tampering, a special ink such as a fluorescent ink, an infrared absorbing ink or a magnetic ink may be used for printing the fine print.

The transfer-receiving sheet (1) thus obtained is
After forming an image pattern with a sublimable dye, it can be transferred onto a plastic material or the like by peeling and removing only the base film (11) by applying heat and pressure. The transfer can be performed by heating to a temperature equal to or higher than the softening point of the thermoplastic resin contained in the image-receiving layer / adhesive layer (16). Usually 150-250
° C. The time may be about 1 to 10 seconds.

FIGS. 3 and 4 show an example in which the transfer sheet shown in FIG. 1 is transferred to an identification card made of a plastic material to produce an image forming body.

In FIG. 4, the transfer sheet is wound on a roll at the upper left in the figure, and is conveyed to a sublimation transfer section (20) and a transfer section (30) via a plurality of conveyance rollers (24). The image receiving layer and the adhesive layer of the transfer sheet are formed on the upper side in the upper part of the figure.

The sublimation transfer section (20) comprises a drum (21) on which the transfer-receiving sheet is in sliding contact, a dye film (23) in which the colorant is a dye, and a thermal head (22) pressed from the dye film (23) side. Having. In forming the image pattern, the dye of the dye layer is partially transferred to the image receiving layer / adhesion layer by applying and heating an electric signal based on the image data to the thermal head to form an image pattern (2a). When the image data is multicolor, a multicolor image pattern may be formed using a dye film having dye layers of different colors on one film, or a different color dye film (23) may be used. A plurality of sets of heads (22) may be provided along the drum (21) to form a multicolor image pattern.

The transfer section (30) has a transfer roll (31) for heating the transfer sheet (1) on the image forming body (32) from the back surface (the surface on which the image receiving layer and the adhesive layer are formed). The part below the release layer of the transfer-receiving sheet (1) heated by the transfer roll (31) is transferred to the image forming body (32).

It is apparent that the image forming body (32) can be applied not only to a card base made of plastic but also to a booklet made of paper such as a passport.

[0050]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to embodiments.

(Example 1) << Production of Transferred Sheet >> Composition of Release Layer Coating Polymethyl methacrylate (Tg: 105 ° C.) 10 parts by weight (BR-80 manufactured by Mitsubishi Rayon Co., Ltd.) Teflon powder 1 part by weight Toluene / 2-butanone (1/1) 40 parts by weight

Composition of image-receiving layer / adhesive layer paint Vinyl chloride-vinyl acetate copolymer (Tg: 65 ° C.) 10 parts by weight (Estrek A manufactured by Sekisui Chemical Co., Ltd.) Melamine / formaldehyde condensate (decomposition point 300 ° C. / (No softening point) (Eposter S, manufactured by Nippon Shokubai Co., Ltd.) 2 parts by weight 2- (2'-hydroxy-5'-methylphenyl) -benzotriazole 2.5 parts by weight Toluene / 2-butanone (2/1) 40 Parts by weight

Using a gravure coater, the above release layer paint was applied on a 12 μm thick polyethylene terephthalate film to a dry weight of 2.0 g / m ² and dried to form a release layer (12). A gravure ink (trade name VCH, 79, manufactured by Toyo Ink Mfg. Co., Ltd.) is formed on the layer.
Grass) was printed with fine print by gravure printing. Further, the dry weight of the above image receiving layer / adhesive layer paint was 1.
An image receiving layer and an adhesive layer (14) were formed by coating and drying at 5 g / m ² to produce a transfer-receiving sheet.

{Production of Dye Film} Dyes of three colors (yellow, magenta, and cyan) are respectively dispersed in polyvinyl butyral, and the thickness is 6 μm using a gravure coater.
m and dried on a polyester film of m in such a manner that each color was alternately arranged to form a dye film having three color dye layers.

In the apparatus shown in FIG. 4, the above-mentioned transfer sheet and dye film, and a card (image forming body) made of polyvinyl chloride were arranged.

The operation of the apparatus will be described below. First, a yellow image pattern is formed on a transfer receiving sheet. The yellow dyed layer of the dye film in which dyes of three colors are alternately arranged is brought into contact with the image-receiving layer and the adhesive layer of the transfer-receiving sheet, and an image previously input to an image processing unit (not shown) of the apparatus. Yellow image data was extracted from the data, and an electric signal corresponding to the image data was applied to the thermal head and heated.
The drum was rotated clockwise to move the relative position between the thermal head and the sheet to be transferred. Magenta,
The same operation was performed for cyan, and a color image pattern was formed on the transfer-receiving sheet.

Next, the portion where the image pattern is formed is conveyed to the transfer section, where it is aligned with a card (image forming body) made of polyvinyl chloride, and heated with a heating roll (heating temperature of 150).
° C) was pressed against the transfer-receiving sheet, and the portion below the release layer of the transfer-receiving sheet was transferred to the card.

The card (image forming body) thus manufactured had a clear image pattern and a fine pattern on it.

(Example 2) << Production of Transferred Sheet >> Composition of Release Layer Coating Polymethyl methacrylate (Tg: 105 ° C.) 10 parts by weight (BR-80 manufactured by Mitsubishi Rayon Co., Ltd.) Teflon powder 1 part by weight Toluene / 2-butanone (1/1) 40 parts by weight

Composition of Diffusion Prevention Layer Coating Composition Nitrocellulose 15 parts by weight (Cellline FM200 manufactured by Daicel Chemical Industries, Ltd.) Toluene / 2-butanone (1/2) 85 parts by weight Composition of image receiving layer / adhesive layer coating composition Vinyl chloride 10 parts by weight of vinyl acetate copolymer (Tg; 65 ° C.) (Estock A manufactured by Sekisui Chemical Co., Ltd.) 3 parts by weight of calcium carbonate 2- (2′-hydroxy-5′-methylphenyl) -benzotriazole 2.5 Parts by weight toluene / 2-butanone (2/1) 40 parts by weight

Using a gravure coater, the above-mentioned paint for the release layer was applied on a 25 μm-thick polyethylene terephthalate film to a dry weight of 2.0 g / m ² and dried to form a release layer (12). A gravure ink (trade name GNC-ST39 manufactured by Toyo Ink Mfg. Co., Ltd.) is formed on the layer.
Ai) was printed with fine print by gravure printing. On the layer, the above-mentioned coating material for the diffusion preventing layer was dried by a gravure coater to a dry weight of 0.
8 g / m ² , and dried to prevent diffusion.
3) was formed. Further, the image receiving layer / adhesive layer coating was applied and dried with a gravure coater so that the dry weight became 1.5 g / m ² to form an image receiving layer / adhesive layer (14), and a transfer-receiving sheet was produced.

Using the transfer-receiving sheet obtained as described above,
A card was manufactured under the same conditions as in Example 1.

(Example 3) << Production of Transferred Sheet >> Composition of Release Layer Paint Epoxy resin (softening point: 148 ° C.) 10 parts by weight (Epiate 1009 manufactured by Yuka Shell Co., Ltd.) Polyethylene powder 0.5 part by weight Toluene / 2-butanone (1/2) 40 parts by weight

Composition of Diffusion Prevention Layer Paint Nitrocellulose 15 parts by weight (Cell Line FM200 manufactured by Daicel Chemical Industries, Ltd.) Toluene / 2-butanone (1/2) 85 parts by weight

Composition of Image Receiving Layer / Adhesive Layer Paint Linear saturated polyester resin (Tg; 65 ° C.) 10 parts by weight (UE-3200 manufactured by Unitika Ltd.) Polytetrafluoroethylene (softening point 320 ° C.) 1 part by weight (Daikin Industrial Co., Ltd. Lubron LD1) 2-hydroxy-4-methoxybenzophenone 6 parts by weight Toluene / 2-butanone (1/1) 40 parts by weight

The release layer paint was applied on a 25 μm thick polyethylene terephthalate film using a gravure coater to a dry weight of 2.0 g / m ² and dried to form a release layer (12). On the layer, the above-mentioned paint for the diffusion preventing layer was coated with a gravure coater to a dry weight of 0.8 g /
m ² was applied and dried to form a diffusion preventing layer (13), and a fine pattern was printed on the layer by gravure printing using gravure ink (trade name: MTGN83 purple, manufactured by Toyo Ink Mfg. Co., Ltd.). Further, the image receiving layer / adhesive layer coating was applied and dried with a gravure coater so that the dry weight became 1.5 g / m ² to form an image receiving layer / adhesive layer (14), and a transfer-receiving sheet was produced.

Using the sheet to be transferred obtained as described above,
A card was manufactured under the same conditions as in Example 1.

(Examples 4 and 5) {Production of Transferred Sheet} A linear saturated polyester resin (Byron manufactured by Toyobo Co., Ltd.) was used as a release improver with respect to 100 parts by weight of the total amount of the thermoplastic resin and the anti-friction agent. 300) to 2
A transfer sheet was manufactured in the same manner as in Examples 2 and 3, except that the release layer to which parts by weight were added was used.

Using the transfer-receiving sheet obtained as described above,
A card was manufactured under the same conditions as in Example 1.

Table 2 shows the scratch resistance, abrasion resistance, solvent resistance, heat resistance, tamper resistance and light resistance of the cards (image-formed bodies) produced in Examples 1 to 5.

[0071]

[Table 1]

Each data was tested by the following method.

Adhesion: Scotch tape peel test (JIS K
5400-1990 / cross-cut tape method), those with no change were evaluated as ○, those that could be partially taken as Δ, and those that could be taken all as ×.

Scratch resistance: The surface was scratched with an H pencil using a pencil tester, and the strength was measured. ○: No scratches, ×: Scratches.

Abrasion resistance: The card surface was rubbed 2,000 times with a Gakushin-type fastness tester (using metal as a friction material),
Observe changes in the surface (fine print). ○: No change, ×: Change.

Plasticizer resistance: A soft polyvinyl chloride sheet was brought into contact with the card surface, a load of 200 g / cm ² was applied thereto, and a temperature of 40 ° C. and 90% R.C. H. 24 hours, 48 hours in an environment of
After storing for 100 hours and 100 hours, the color change, fading, and bleeding of the image were observed.し な い indicates no change, 多少 indicates slight discoloration or bleeding, and × indicates discoloration or bleeding.

Solvent resistance: Freon, ethanol and gasoline were impregnated with a cotton swab, and the surface of the card was rubbed to observe the change. ○: No change at all, ×: Change once.

Heat resistance: 50 ° C., 90% R.C. H. And stored for 48 hours in the same environment, and observed the discoloration of the image.無 い indicates no change and × indicates discoloration.

Tamper-preventing property: Good when fine print pattern can be clearly recognized, and poor when fine pattern cannot be recognized.

Light resistance: 4 ultraviolet rays with a fade meter
After irradiation for 0 hour, the reduction rate of the reflection density of the image was measured.

[0081]

As described above, since the transfer-receiving sheet according to the present invention has a filler in the image-receiving layer / adhesive layer, for example, the heat-melting temperature of the thermoplastic resin in the image-receiving layer / adhesive layer can be reduced. Even if it is low, the image receiving layer / adhesive layer does not transfer to the dye film side in the image pattern forming step, and the adhesion of the image receiving layer / adhesive layer to the image forming body is good. Further, since the thermoplastic resin in the image receiving layer and the adhesive layer has a glass transition point of 50 ° C. or higher, there is no change in image due to heat.

Furthermore, since the fine print is located below the image receiving layer and the adhesive layer, it does not affect the formation of the image pattern. Further, the use of a special ink such as a fluorescent ink, an infrared-absorbing ink or a magnetic ink increases the effect of preventing tampering. Also, since the diffusion preventing layer is made of little cellulose,
Diffusion of the sublimable dye forming the image pattern to the outside (release layer) can be prevented.

Therefore, after an image pattern made of a sublimable dye is formed on the image receiving layer / adhesive layer of the transfer receiving sheet and then transferred to the surface of an image forming body made of a plastic material or the like, chemical and mechanical damage of the image pattern is caused. Can be prevented,
In addition, it is possible to manufacture an image forming body that can prevent discoloration due to light and can prevent tampering due to formation of fine prints.

[0084]

[Brief description of the drawings]

FIG. 1 is a sectional view according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view according to one embodiment of the present invention.

FIG. 3 is a sectional view according to an embodiment of the present invention.

FIG. 4 is a cross-sectional view after the transfer sheet of FIG. 1 has been transferred to a card body.

FIG. 5 is an explanatory diagram of an apparatus for manufacturing an image forming body using the transfer-receiving sheet of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Transfer receiving sheet 2 Card main body 2a Image pattern 11 Base film 12 Release layer 13 Diffusion prevention layer 14 Image receiving layer and adhesive layer 15 Fine print layer 20 Sublimation transfer part

Claims (6)

(57) [Claims] 1. A heat-resistant base film in which a release layer easy to peel off from the base film and an image-receiving layer / adhesive layer are sequentially laminated, and a fine print is formed between the release layer and the image-receiving layer / adhesive layer. A transfer sheet, comprising a layer. 2. A heat-resistant base film comprising a heat-resistant base film, a release layer which is easy to peel from the base film, a sublimable dye diffusion preventing layer, and an image-receiving / adhesion layer. A transfer sheet, wherein a fine print layer is provided between the anti-diffusion layer and the image receiving layer / adhesive layer. 3. The transfer sheet according to claim 1, wherein the fine print layer is printed with a fluorescent ink, an infrared absorbing ink or a magnetic ink. 4. A release layer comprising a friction-resistant agent and a thermoplastic resin, wherein the thermoplastic resin is polymethyl methacrylate,
3. The transfer sheet according to claim 1, wherein the sheet is an epoxy resin. 5. The transfer sheet according to claim 1, wherein the image-receiving layer and the adhesive layer are made of an ultraviolet absorber and a thermoplastic resin having a glass transition point of 50 ° C. or higher. 6. The transfer sheet according to claim 2, wherein the diffusion preventing layer of the sublimable dye is nitrocellulose.