JPH06286295A - Transfer sheet - Google Patents

Abstract

PURPOSE:To provide a transfer sheet, reduced in the damage, due to the deterioration (fading) of a picture pattern formed of sublimable dye and/or heat and employed for the manufacture of a picture indicating body, whose picture data can not be forged. CONSTITUTION:A transfer sheet is constituted of a heat resistant base film 11, a separating layer 12, easily separated from the base film, a hologram forming layer 13, a transparent thin film layer 14, having a refractive index larger than the same of the hologram forming layer, and an image receiving and bonding layer 16, consisting of a thermosetting resin having filler and a glass transition point higher than 50 deg.C, which are laminated sequentially. A back coat layer for preventing blocking between the image receiving and bonding layer 16 and the heat resistant base film 11, is provided at the other side of the heat resistant base film 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises an image pattern formed by sublimation transfer means based on image data and a hologram pattern, and can be used for manufacturing an image display applied to an ID card or the like. Regarding a transfer sheet.

[0002]

2. Description of the Related Art An image pattern is formed on an image receiving layer of a transferred sheet by sublimation transfer means based on image data, and at least the image receiving layer of the transferred sheet is transferred onto a surface of an image display (object) by a thermal transfer method. A method for forming an image is known (for example, JP-A-63-81093).

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

The image receiving layer of the transfer sheet as described above is brought into contact with the dye layer of the dye film in which the colorant is a sublimable dye, and the thermal head is pressed from the dye film side to thermally transfer an electric signal based on the image data. By applying and heating to the head, the dye layer is partially transferred to the image receiving layer to form an image pattern. When the image data is multicolored, the same steps are repeated using dye films having different color tones to form a multicolored image pattern on the transfer sheet.

The transfer sheet on which the image pattern is formed by the above steps is brought into contact with the surface of the image display member, and a heating medium such as a heat roll or a heating plate is pressed and heated from the transfer sheet side to at least the image receiving layer. Is thermally transferred to the image display body. At this time, since the image receiving layer is a thermoplastic resin, it also functions as an adhesive. The above method is clear because the image pattern is formed by the sublimable dye,
Further, it has an effect that an image can be formed without particularly selecting an image forming body.

However, when the above method is carried out, the material selection of the image receiving layer of the transferred sheet becomes a problem. That is, in the step of transferring the transfer sheet to the image display body, it is considered to use a resin having a low heat melting temperature in order to obtain sufficient adhesiveness. However, when a resin having a low heat melting temperature is used, blocking tends to occur during storage of the transferred sheet, and as a result, the appearance of the transferred sheet and the quality of the transferred image are adversely affected. Occurs.

Further, when a resin having a high heat melting temperature is used for the image receiving layer of the transfer sheet to prevent blocking,
In order to have sufficient adhesiveness, the temperature of the heating medium at the time of transfer must be raised, which causes deterioration (fading) of the transferred image and damage to the image display body due to heat.

[0008]

Therefore, the present invention is used for producing an image display body which is excellent in storage stability, with less deterioration of an image formed by a sublimable dye and heat damage to the image display body. It is intended to provide a transfer target sheet.

[0009]

To achieve this object, the present invention provides a heat-resistant base film on one side of which a release layer, a hologram-forming layer, and a hologram-forming layer which are easily peelable from the base film. Also has a transparent thin film layer having a large refractive index and a glass transition temperature (T
g) image-receiving layers having a thermoplastic resin having a temperature of 50 ° C. or higher are successively laminated, and a back coat layer for preventing blocking between the image-receiving layer and the heat-resistant base film is further provided on the other side of the heat-resistant base film. A transfer target sheet is provided.

The invention according to claim 2 provides the transfer sheet according to claim 1, wherein the image receiving layer contains at least a filler and an ultraviolet absorber. Also,
The invention according to claim 3 is characterized in that the release layer comprises a friction-resistant agent and a thermoplastic resin, and the thermoplastic resin is polymethylmethacrylate or an epoxy resin. Provide the seat.

Further, the invention according to claim 4 is characterized in that the hologram forming layer is made of urethane resin.
The transfer sheet according to any one of 1 to 3 is provided. In addition, claim 5
The described invention provides the transfer sheet according to any one of claims 1 to 4, wherein a primer layer is provided between the transparent thin film layer and the image receiving layer. The invention according to claim 6 is characterized in that the primer layer contains at least one of urethane resin and epoxy resin.
The transfer sheet described is provided.

The transfer sheet of the present invention will be described in detail below with reference to the drawings. As shown in FIG. 1, the transfer sheet according to the present invention comprises a heat resistant base film (11), a release layer (12), a hologram forming layer (13), a transparent thin film layer (14), a primer layer (15), It comprises an image receiving layer (16) and a back coat layer (17) on the side opposite to the image receiving layer side. A hologram pattern (3a) is formed on the hologram forming layer (13).

The heat resistant base film (11) is required to have heat resistance that is not softened and deformed by the heat pressure during transfer. The heat resistant base film (11) is known, and for example, a polyethylene terephthalate film having a thickness of 3 to 50 μm can be used.

Further, the peeling layer (12) must be easily peeled from the heat resistant base film (11) at the time of thermal transfer. Further, it is necessary to fulfill the function of the protective film after being transferred. The function of the protective film is to prevent external chemical and mechanical damage to the image by the dye. In order to satisfy both functions, it is desirable to use a mixture of an anti-friction agent and a thermoplastic resin.

The thermoplastic resin used here is one that prevents penetration of a plasticizer or chemicals and reduces scratches due to scratching. As such a thermoplastic resin,
Polymethylmethacrylate or epoxy resin can be used. Among the existing thermoplastic resins, polymethylmethacrylate and epoxy resin have excellent plasticizer resistance and are easily peeled off from the heat resistant base film (11).
By using these resins for the release layer (12), it is possible to prevent migration of the plasticizer contained in a soft vinyl chloride sheet or a plastic eraser when they are brought into contact with the transferred image. In addition, it is possible to prevent the penetration of chemicals such as acids, alkalis, alcohols and kerosene, and prevent the influence on the image.

Further, the anti-friction agent is added to improve wear resistance and scratch resistance. For example, Teflon powder, polyethylene powder, animal wax, vegetable wax, mineral wax, natural wax such as petroleum wax, synthetic hydrocarbon wax, hydrogenated wax, synthetic ketone wax, amine and amide wax, chlorine. Examples thereof include synthetic hydrocarbon waxes, synthetic animal wax waxes, synthetic waxes such as α-olefin waxes, and metal salts of higher fatty acids such as zinc stearate.

The peeling layer (12) is composed of the thermoplastic resin 85 to the thermoplastic resin 85 to the total amount of 100 parts by weight of the thermoplastic resin and the anti-friction agent.
95 parts by weight and 5 to 15 parts by weight of anti-friction agent may be used. Further, the coating amount may be 0.5 to 3 μm. In the release layer (12), in addition to the above components, a release improving agent may be mixed for the purpose of improving the breakage during transfer. For example, 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.

Incidentally, it is desirable not to add other additives such as an ultraviolet absorber to the peeling layer (12). This is because the chemical resistance is lowered or the plasticizer is easily penetrated by the addition, which causes deterioration of the mechanical strength of the release layer.

The method for applying the release layer (12) is as follows.
The release layer composition may be formed into a coating material with an appropriate solvent, and the coating material may be formed by coating and drying by a coating method such as gravure coating, roll coating coating or bar coating coating.

The hologram forming layer (13) is a surface relief type hologram stamper for forming the hologram pattern (3a) by heating and pressing. As the resin used for the hologram forming layer (13), it is desirable to use a two-component curing type urethane resin. That is, the two-component curing type urethane resin has a good embossing moldability, is less likely to cause uneven press, produces a bright reproduced image, and also has good adhesion to the base material at the time of embossing formation, and has good adhesion to the metal reflective layer. Adhesiveness is also good, and releasability at the time of transferring to a transfer target is very good.

In other words, the two-component curing type urethane resin as the hologram forming layer (13) described in the present invention has various physical properties such as solvent resistance, heat resistance, and processability, and therefore, polyether polyol, polyester polyol, acrylic polyol, etc. The polyol-curable urethane resin composed of the polyol component and the prepolymer having an isocyanate group is suitable. Among them, the polyol component has a glass transition point of 7
By using an acrylic polyol resin having an OH group in the range of 0 to 105 ° C. and an OH group in the range of 50 to 150, the coating suitability is good, and the embossing moldability required for the transferred sheet and the base film It is possible to obtain a transfer sheet having excellent releasability. As the isocyanate component, toluene diisocyanate (TDI), xylene diisocyanate (XDI), hexamethylene diisocyanate (HMDI) or the like can be used.

Further, as a modifier for improving coating suitability and transferability, a cellulose resin such as nitrocellulose, acetylcellulose, cellulose acetate butyrate, cellulose acetate propionate, ethyl cellulose and methyl cellulose is converted into a two-component reactive urethane resin. On the other hand, by adding together at most 30% by weight, better results can be obtained.

As a method for applying such a hologram forming layer (13), a paint resin is applied by a method such as roll coating or blade coating and dried to form 0.5 to
A film thickness of 5 μm may be formed. The hologram-forming layer (13) thus obtained has a good adhesion to the base film coated with the release varnish layer, has excellent moldability by heating and pressing during embossing, and has a nickel surface. ,
It does not adhere to a stamper plated with gold, chrome, etc., and shows good adhesion to the metal reflective layer, and the film is cut well. Furthermore, reliable transfer is possible without peeling defects of the metal reflective layer during hot stamping, transfer unevenness, burrs, and blistering, and due to the excellent heat resistance of the urethane resin, it is generated by the vapor deposition process and heat during hot stamping. It is possible to prevent the deterioration of the external appearance such as cracking, whitening, and destruction of the hologram pattern due to the shrinkage.

The transparent thin film layer (14) is made of a material having a higher refractive index than the resin of the hologram forming layer (13) and a high transmittance in the visible light region. When the transparent thin film layer (14) having a high refractive index is provided, it can be seen as a mere transparent body outside the reproducible angle range of the hologram due to the angle dependence of the replay characteristic of the hologram, and the reproducible angle range of the hologram is obtained. Then, the refractive index of light becomes maximum, and the effect as a reflection hologram appears. Examples of the material of such a transparent thin film layer (14) include the inorganic substances listed in Table 1.

[0025]

[Table 1]

As a method for forming the transparent thin film layer (14), a vacuum deposition method, a sputtering method, an ion plating method or the like can be used. A suitable film thickness is in the range of 100 to 10,000. The primer layer (15) is an adhesion improving layer for adhering the transparent thin film layer (14) and the image receiving layer (16). Urethane resin and epoxy resin are suitable as such resin. Specifically, examples of the urethane resin include a polyol ion component such as a polyurethane ionomer resin, a polyether polyol, a polyester polyol, and an acrylic polyol, and a prepolymer having an isocyanate group, a polyester urethane, and the like.

The coating amount of the primer layer (15) is
0.3 to 2 μm is suitable. The method of applying the primer layer (15) is as follows.
The paint may be applied and dried by an application method such as gravure application, roll coating application, or bar coating application.

The image receiving layer (16) forms an image pattern and adheres to the surface of the image forming body made of a plastic material or the like. The thermoplastic resin used in the image receiving layer (16) may have a glass transition point (Tg) of 50 ° C. or higher. When a resin having a glass transition temperature of less than 45 ° C. is used, after the transfer, the resin causes migration of the dye, which causes image bleeding. Further, those having a glass transition point of 110 ° C. or lower are preferable. When a resin having a glass transition point of more than 110 ° C. is used, a high temperature is required for transfer, a load is applied to the thermal head, and a plastic material such as a polyvinyl chloride card may be deformed by heat.

The thermoplastic resin used in the image-receiving layer (16) is, for example, polyester such as linear saturated polyester, vinyl chloride resin such as polyvinyl chloride or vinyl chloride-vinyl acetate copolymer resin, polyacrylic acid, 2-Methoxyethyl polyacrylate, polymethyl acrylate, 2-naphthyl polyacrylate, isobornyl polyacrylate, polymethacrylomethyl, polyacrylonitrile, polymethylchloroacrylate, polymethylmethacrylate, polyethylmethacrylate, Poly-tert-butyl methacrylate, poly-isobutyl methacrylate, poly-phenyl methacrylate, methyl methacrylate and alkyl methacrylate (provided that the alkyl group has 2 to 6 carbon atoms)
Acrylic resin such as copolymer resin, polystyrene, polydivinylbenzene, polyvinylbenzene, styrene-
Examples thereof include butadiene copolymer resins and vinyl resins such as styrene and alkyl methacrylate (where the alkyl group has 1 to 6 carbon atoms).

When a sublimation transfer image is transferred to the surface of the image receiving layer (16) through a dye film with a thermal head, since the main component of the image receiving layer (16) is a thermoplastic resin, the image is directly received by the heat of the thermal head. Layer (16) is heat fused to the dye layer of the dye film and no clear image pattern is obtained. Therefore, an inorganic or organic filler having an antiblocking property is added to the image receiving layer (16) to prevent heat fusion.

Examples of the organic filler include polytetrafluoroethylene fine particles, starch, silicone resin fine particles, polyacrylonitrile-based fine particles, cured resin fine particles made of benzoguanamine resin and melamine resin as raw materials. As inorganic filler, calcium carbonate, talc,
Examples include kaolin, zinc oxide, titanium oxide, silicon oxide, aluminum hydroxide and magnesium oxide. The filler is
It is desirable to add 1 to 20 parts by weight to 100 parts by weight of the thermoplastic resin.

If necessary, the ultraviolet absorber contained in the image receiving layer (16) prevents discoloration of the dye due to light. That is, it absorbs ultraviolet rays having a wavelength of 250 to 400 nm and re-radiates the energy as heat energy that is harmless to the dye, and the ultraviolet absorber itself does not deteriorate. 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 UV absorbers such as t-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-methoxy-
Benzophenone-based UV 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 UV 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′-diphenyl acrylate and ethyl-2-cyano-3,3-diphenyl acrylate.

The ultraviolet absorber may be 5 to 40 parts by weight based on 100 parts by weight of the mixture of the thermoplastic resin and the filler.

The method for coating the image receiving layer (16) is as follows.
The composition of the image receiving layer (16) may be formed into a coating material by using a suitable solvent, and the coating material may be formed by coating and drying by a coating method such as gravure coating, roll coating coating or bar coating coating. The coating amount of the image receiving layer (16) is 0.5 to 4 μm.
m is preferred.

The back coat layer (17) is provided for the purpose of preventing blocking between the heat resistant base film (11) and the image receiving layer (16) when the transfer sheet is stored. Examples of the back coat layer (17) include those in which nitrocellulose contains silicone oil, those in which polyester resin contains silicon oil, and those in which polyester resin is grafted with silicon resin. Further, a crosslinking agent may be used in combination for the purpose of improving heat resistance.

The method for applying the back coat layer (17) is as follows. First, the composition of the back coat layer (17) is made into a paint with an appropriate solvent, and the paint is gravure-coated, roll-coated, or bar-coated. It may be formed by coating and drying by the coating method of. Back coat layer (1
The coating amount of 7) is preferably 0.3 to 2 μm.

The transfer sheet (1) thus obtained is
After forming an image pattern with a sublimable dye, the image can be transferred by stacking it on a plastic material or the like and applying heat and pressure to peel and remove only the base film (11). Transfer is performed by the image receiving layer (1
It can be carried out by heating to a temperature not lower than the softening point of the thermoplastic resin contained in 6). It is usually 120 to 250 ° C. The time may be about 1 to 10 seconds.

FIGS. 3 and 4 show an example in which the transfer sheet (1) shown in FIG. 1 is transferred to an identification card made of a plastic material to manufacture an image forming body. In FIG.
The transfer target sheet is wound on a roll on the upper left side of the drawing, and passes through a plurality of transport rollers (24) to a sublimation transfer section (20),
It is conveyed to the transfer section (30). The image receiving layer of the transfer sheet is formed on the upper side in the upper part of the drawing.

The sublimation transfer section (20) has a drum (21) with which the transfer sheet (1) is in sliding contact, a dye film (23) in which a coloring agent is a dye, and a thermal head in pressure contact with the dye film (23) side. It has (22). In forming an image pattern, an electric signal based on image data is applied to a thermal head and heated to partially transfer the dye in the dye layer to the image receiving layer to form an image pattern (2a). When the image data is multicolor, a multicolor image pattern may be formed by using a dye film having dye layers of different colors on one film, or a dye film (23) of different colors and a thermal film may be formed. Multiple 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 target sheet (1) on the image forming body (32) from the back coat layer surface. The part below the peeling layer of the transferred sheet (1) heated by the transfer roll (31) is transferred to the image forming body (32). The image forming body (32)
It is obvious that can be applied not only to card base materials made of plastic but also to paper booklets such as passports.

[0042]

EXAMPLES The present invention will be described in detail below with reference to examples.

(Example 1) {Production of transfer sheet} Composition of release layer coating composition Epoxy resin (softening point 148 ° C.) 10 parts by weight (Epicate 1009 manufactured by Yuka Shell Co., Ltd.) Polyethylene powder 0.5 〃 toluene / 2-butanone (1/2) 40 〃

Composition of hologram forming layer coating composition Acrylic polyol resin 25 parts by weight (TG: 75 ° C., OH value: 100) Nitrocellulose resin 5 〃 (nitrogen content: 12%, average degree of polymerization: 45, viscosity: 1/2 ) Xylene diisocyanate 5〃 Toluene / 2-butanone (25/20) 45〃 Isobutylene acetate 20〃

Composition of Coating for Image Receiving Layer Linear saturated polyester resin (Tg: 65 ° C.) 10 parts by weight (UE-3200 manufactured by Unitika Ltd.) Polytetrafluoroethylene (softening point 320 ° C.) 1 〃 (Daikin Industries Ltd.) Lubron LD1) 2-hydroxy-4-methoxybenzophenone 6 〃 Toluene / 2-butanone (1/1) 40 〃

Composition of the back coat layer: Nitrocellulose (Cell line FM200 manufactured by Daicel Chemical Industries Ltd.) 10 parts by weight Silicone oil 1 〃 2-butanone 40 〃

On one side of a polyethylene terephthalate film having a thickness of 12 μm, a gravure coater was used to apply and dry the above-mentioned release layer coating material to a dry film thickness of 2.0 μm to form a release layer (12). did. The hologram forming layer coating material is applied onto the layer by a gravure coater so as to have a dry film thickness of 1.2 μm and dried to form a hologram forming layer (13), which is then aged at 60 ° C. for 72 hours and then pressed. The hologram forming layer and the hologram pattern forming surface of the stamper were superposed by a machine, and embossing was performed under the conditions of 160 ° C. and heating and pressure of 40 kg / cm to form a hologram pattern on the hologram forming surface.

Next, ZnS was vapor-deposited to a thickness of about 500Å on the hologram forming surface to form a transparent thin film layer (14).
Further, the above image receiving layer coating material is applied and dried by a gravure coater so that the dry film thickness becomes 1.5 μm, and then the image receiving layer (16)
Was formed. Further, the back coat layer was applied and dried on the other side of polyethylene terephthalate by a gravure coater so that the dry film thickness was 1.0 μm to form a back coat layer (17) to obtain a transfer sheet. .

{Production of Dye Film} Dyes of three colors (yellow, magenta and cyan) are dispersed in polyvinyl butyral and a thickness of 6 μm is obtained by using a gravure coater.
On the polyester film of m, coating and drying were performed so that each color was alternately arranged, and a dye film having dye layers of three colors was formed.

The transfer sheet and dye film described above and a card (image forming body) made of polyvinyl chloride were placed in the apparatus shown in FIG. The operation of the device will be described below. First, a yellow image pattern is formed on the transfer sheet. The yellow dye layer of the dye film in which the dyes of three colors are alternately arranged is brought into contact with the image receiving / adhesive layer of the transfer sheet, and the image data of the image data previously input to the image processing unit (not shown) of the apparatus is recorded. Image data of yellow is extracted from the inside, and an electric signal corresponding to it is applied to the thermal head.
Heated. The drum was rotated clockwise to move the relative position between the thermal head and the transfer sheet.
The same procedure was performed for magenta and cyan to form a color image pattern on the transfer sheet.

Next, the portion on which the image pattern is formed is conveyed to the transfer portion, aligned with a card (image forming body) made of polyvinyl chloride, and heated by a heating roll (heating temperature 150).
C.) was pressed against the transfer sheet, and the layers below the release layer of the transfer sheet were transferred to the card. The card (image forming body) produced in this manner had a clear image pattern and a hologram pattern thereon.

(Example 2) {Production of transfer sheet} Composition of release layer coating composition Polymethylmethacrylate (Tg: 105 ° C.) 10 parts by weight (Mitsubishi Rayon Co., Ltd. BR-80) Teflon powder 1 〃 toluene / 2-butanone (1/1) 40 〃

Composition of paint for hologram forming layer Acrylic polyol resin 25 parts by weight (TG: 75 ° C., OH value: 100) Nitrocellulose resin 5 〃 (nitrogen content: 12%, average degree of polymerization: 45, viscosity: 1/2 ) Xylene diisocyanate 5〃 Toluene / 2-butanone (25/20) 45〃 Isobutyl acetate 20〃

Composition of primer layer coating composition Polyurethane ionomer aqueous dispersion 100 parts by weight (DIC HYDRAN AP40, NV: 20% by weight)

Composition of image-receiving layer coating vinyl chloride-vinyl acetate copolymer (Tg: 51 ° C.) 10 parts by weight (VYNC manufactured by Union Carbide) Melamine-formaldehyde condensate (decomposition point 300 ° C./no softening point) (Nippon Catalyst ( Co., Ltd. Eposter S) 2 〃 2- (2'-hydroxy-5'-methylphenyl) -benzotriazole 2.5 〃 Toluene / 2-butanone (2/1) 40 〃

Composition of back coat layer Polyester urethane (UR1400 Toyobo Co., Ltd.) 10 parts by weight Hexamethylene diisocyanate 0.2 〃 Silicon oil 0.2 〃 Toluene / 2-butanone 40 〃

On the one side of a polyethylene terephthalate film having a thickness of 12 μm using the above composition, a gravure coater was used to apply the release layer coating composition to a dry film thickness of 2.0 μm.
Then, the release layer (12) was formed by coating and drying so as to have a thickness of m. The hologram forming layer coating material is applied to the layer by a gravure coater so as to have a dry film thickness of 1.2 μm and dried to form a hologram forming layer (13), which is then aged at 60 ° C. for 72 hours and then pressed. The hologram forming layer and the hologram pattern forming surface of the stamper were superposed by a machine, and embossing was performed under the conditions of 160 ° C. and heating and pressure of 40 kg / cm to form a hologram pattern on the hologram forming surface.

Next, ZnS was vapor-deposited to a thickness of about 500Å on the hologram forming surface to form a transparent thin film layer (14).
Further, the primer layer coating material was applied and dried using a gravure coater so that the dry film thickness was 1.0 μm, to form a primer layer (15). Further, the image receiving layer coating material was applied and dried by a gravure coater so that the dry film thickness was 1.5 μm, to form an image receiving / adhesive layer (16). Further, the back coat layer was applied and dried on the other side of polyethylene terephthalate by a gravure coater so that the dry film thickness was 1.0 μm to form a back coat layer (17) to obtain a transfer sheet. . Using the transfer sheet obtained as described above, a card was manufactured under the same conditions as in Example 1.

Example 3 {Manufacture of Transferred Sheet} In Example 1, the linear saturated polyester resin (Tg: 65 ° C., Unitika U)
Instead of E-3200), a linear saturated polyester resin (Tg: 60 ° C., UE-3203 manufactured by Unitika Ltd.)
A transfer sheet was manufactured in the same manner as in Example 1 except that was used.

Using the transfer sheet obtained as described above,
A card was manufactured under the same conditions as in Example 1. (Comparative Examples 1, 2, and 3) In Examples 1, 2, and 3, those not provided with the back coat layer are referred to as Comparative Examples 1, 2, and 3, respectively. A card was manufactured in the same manner using the obtained transfer-receiving sheet. Adhesiveness, scratch resistance, abrasion resistance, plasticizer resistance, solvent resistance, heat resistance, tamper resistance, and light resistance of the cards (image forming bodies) manufactured in Examples 1 to 3 and Comparative Examples 1 to 3 Table 2 shows the properties and blocking resistance.

[0061]

[Table 2]

Each data was tested by the following method. Adhesiveness ... Cellotape peeling test (JIS K5400-1
990 / cross-cut tape method), those that do not change are ○, those that can be partially taken are △, those that can be taken are ×. Scratch resistance: Scratch the surface with a pencil of H to measure the strength. ○ those that are not scratched, × those that are scratched.

Abrasion resistance: A card surface was rubbed 2000 times with an academic vibration type fastness tester (a metal is used as a friction material),
Observe the change of the surface (fine print). The one that does not change is ○, and the one that changes is ×. Plasticizer resistance: A soft polyvinyl chloride sheet is brought into contact with the surface of the card and a load of 200 g / cm 2 is applied to the card at 40 ° C. and 9
0% R. H. 24 hours, 48 hours and 100
Save each time and observe the color change, fading and bleeding of the image. Those that do not change are ○, those that have some discoloration or bleeding are △, those that have discoloration or bleeding are ×.

Solvent resistance: Freon, ethanol, and gasoline are soaked in a cotton swab, the surface of the card is rubbed, and the change is observed. The ones that did not change at all were ○, and the ones that changed even once were ×. Heat resistance ... 50 ° C., 90% R.C. H. Stored under the environment for 48 hours and observe the discoloration of the image. The one that does not change is ○, and the one that has faded is ×. Tamper-proof property: Those that can clearly recognize the hologram pattern, those that cannot recognize the hologram pattern x,
△ if the hologram pattern is not clear.

Light resistance ... 4 ultraviolet rays with a fade meter
After irradiation for 0 hours, the reduction rate of the reflection density of the image is measured. Blocking resistance: 50 ° C, 90% R.S. H. The transfer-receiving sheet is stored in a rolled state under the environment of 48 hours for 48 hours and observed for blocking. The one that is not blocked is marked with ○, the one with some blocking marks is marked with △, and the one with many blocking marks is marked with ×.

[0066]

As described above, since the transfer sheet according to the present invention has the back coat layer on the side of the heat resistant base film opposite to the image receiving layer side, the thermoplastic resin in the image receiving layer is used. Even when the Tg of the sheet is low, it does not cause blocking during storage of the transferred sheet, and has good adhesiveness after transfer to the image forming body.

Therefore, by forming an image pattern made of a sublimable dye on the image receiving layer of the transfer target sheet and then transferring it to the surface of the image forming body made of a plastic material or the like, chemical and mechanical damage to the image pattern can be prevented. In addition, it is possible to manufacture an image forming body that can prevent discoloration due to light and can prevent falsification by hologram formation.

[0068]

[Brief description of drawings]

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

FIG. 2 is a sectional view according to an embodiment of the present invention.

FIG. 3 is a cross-sectional view after the transfer sheet of FIG. 1 is transferred to a card body.

FIG. 4 is an explanatory diagram of an apparatus for manufacturing an image forming body using the transfer target sheet of the present invention.

[Explanation of symbols]

 1 Transferred Sheet 2 Card Body 2a Image Pattern 3a Hologram Pattern 11 Base Film 12 Release Layer 13 Hologram Forming Layer 14 Transparent Thin Film Layer 15 Primer Layer 16 Image Receiving Layer 17 Backcoat Layer 20 Sublimation Transfer Part 21 Drum 22 Thermal Head 23 Dye Film 24 Conveyor roller 30 Transfer unit 31 Transfer roll 32 Image forming body

Claims (6)

[Claims] 1. A heat-resistant base film, on one side of which a peeling layer which can be easily peeled from the base film, a hologram forming layer, a transparent thin film layer having a refractive index larger than that of the hologram forming layer, and a sublimable dye can be received. Glass transition temperature (T
g) sequentially laminating image-receiving layers having a thermoplastic resin having a temperature of 50 ° C. or higher, and further providing a back coat layer on the other side of the heat-resistant base film to prevent blocking between the image-receiving layer and the heat-resistant base film. Transferred sheet characterized by: 2. The transfer sheet according to claim 1, wherein the image receiving layer contains at least a filler and an ultraviolet absorber. 3. The release layer comprises a friction-resistant agent and a thermoplastic resin, the thermoplastic resin being polymethylmethacrylate.
3. The transfer sheet according to claim 1, which is an epoxy resin. 4. The transfer sheet according to claim 1, wherein the hologram forming layer is a urethane resin. 5. The transfer sheet according to claim 1, wherein a primer layer is provided between the transparent thin film layer and the image receiving layer. 6. The transfer sheet according to claim 1, wherein the primer layer contains at least one kind of urethane resin and epoxy resin.