JP2003025745A - Intermediate transfer recording medium and printed matter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an intermediate transfer recording medium and a printed matter, excellent in the various durabilities of a heat transferred image of a printed matter and good in the cutting of edges of a transferred film of the intermediate transfer recording medium, further, preventing the deformation of a transferred body between the transferred part and the non-transferred part of the intermediate transfer recording medium even under any severe using condition. SOLUTION: The intermediate transfer recording medium is constituted of at least a separating layer, an ionizing radiation cured resin layer and a receptive layer, which are provided sequentially as a transferring unit while the ionizing radiation curing resin layer is constituted of an urethane modified acrylic resin and the resin layer of the same is cross-linked by the irradiation of ultraviolet rays or electronic beams and is constituted of a film, rigid and excellent in various durabilities. The ionizing radiation curing resin layer is especially preferable to contain 5-40 pts.wt. of an oligomer per 100 pts.wt. of the urethane modified acrylic resin whereby the layer becomes excellent in a flexibility as a protective layer after transferred to a body to be transferred and the deformation of the transferred body can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intermediate transfer recording medium which provides a printed matter excellent in durability of a thermal transfer image even under severe use conditions.

[0002]

2. Description of the Related Art Conventionally, a thermal transfer method has been widely used as a simple printing method. The thermal transfer method is a method in which a thermal transfer sheet having a color material layer provided on one surface of a base sheet and a thermal transfer image receiving sheet provided with an image receiving layer as required are superposed, and a thermal transfer sheet is heated by a heating means such as a thermal head. Is a method of forming an image on the thermal transfer image-receiving sheet by heating the rear surface of the image-wise to selectively transfer the color material contained in the color material layer.

The thermal transfer method is classified into a melt transfer method and a sublimation transfer method. The melt transfer method uses a heat transfer sheet in which a base material sheet such as PET film is loaded with a heat-melting ink layer in which a coloring material such as a pigment is dispersed in a binder such as a wax or a resin, which is heated by a thermal head. This is an image forming method in which energy corresponding to image information is applied to the means, and a coloring material is transferred together with a binder onto a thermal transfer image receiving sheet such as paper or a plastic sheet. An image formed by the melt transfer method has high density and excellent sharpness, and is suitable for recording binary images such as characters.

On the other hand, the sublimation transfer system uses a thermal transfer sheet in which a base material sheet such as a PET film has a dye layer in which a dye which is thermally transferred by sublimation is dissolved or dispersed in a resin binder, and a thermal transfer sheet such as a thermal head is used. This is an image forming method in which energy corresponding to image information is applied to a heating means, and only a dye is transferred and transferred onto a thermal transfer image receiving sheet in which a dye receiving layer is provided on a base material sheet such as paper or plastic if necessary. In the sublimation transfer method, the transfer amount of the dye can be controlled according to the amount of applied energy, so that it is possible to form a gradation image in which the image density is controlled for each dot of the thermal head. Further, since the coloring material used is a dye, the formed image has transparency, and the reproducibility of intermediate colors when dyes of different colors are superposed is excellent. Therefore, even when the dyes of different colors such as yellow, magenta, cyan, and black are used and the dyes of the respective colors are overlaid on the thermal transfer image-receiving sheet, a high-quality photographic full-color image with excellent reproducibility of intermediate colors can be obtained. It can be formed.

The specific applications of the thermal transfer image-receiving sheet by such a thermal transfer method are various. Typical examples include printing proofs, image output, and CAD /
Design and output of CAM etc., various medical analysis equipment such as CT scan and endoscopic camera, output use of measuring equipment and substitute for instant photo, identification card, ID card, credit card and other cards It can be used to output facial photographs to other kinds of objects, composite photographs in amusement facilities such as amusement parks, game centers, museums, and aquariums, and use as commemorative photographs. With the diversification of applications as described above, the demand for forming a thermal transfer image on an arbitrary object is increasing, and as one of the measures, an intermediate transfer recording medium in which a receptive layer is peelably provided on a substrate is used. , A thermal transfer sheet having a dye layer or a heat-fusible ink layer in the receiving layer is used to transfer colorants such as dyes and pigments to form an image, and then the intermediate transfer recording medium is heated to receive the receiving layer. There has been proposed a method of transferring the material onto the transfer target. (JP-A-62-238791, etc.)

Further, by using the above-mentioned intermediate transfer recording medium, the receiving layer can be transferred to the transferred material,
It is preferably used for a transferred material on which a color material is difficult to transfer and a high-quality image cannot be directly formed, and a transferred material which is easily fused with a coloring material layer during thermal transfer. Also, a printed matter is created by previously writing or printing necessary items such as a signature on the transfer-receiving body, and then transferring the transfer portion on which an image such as characters or photographs is formed from the intermediate transfer recording medium. You can also Therefore, the intermediate transfer recording medium is preferably used for producing an identification card such as a passport or a printed matter such as a credit card or an ID card. The applicant of the present invention, in Japanese Patent Application Laid-Open No. 10-315639, can be peeled onto a base material in order to have durability such as light resistance, weather resistance and abrasion resistance of a thermal transfer image on a transfer body such as an ID card. Has proposed an ionizing radiation curable resin layer and a receptor layer transfer sheet (intermediate transfer medium film) provided with a receptor layer.

[0007]

However, when the above intermediate transfer recording medium is used, the durability of the thermal transfer image is improved, but the ionizing radiation curable resin layer is too hard,
There is a problem that the transferred material is not able to follow the flexibility of the transferred material and the transferred material is deformed between the transfer part and the non-transfer part of the intermediate transfer recording medium. Furthermore, when the intermediate transfer recording medium is transferred to the transfer target, the transfer film of the intermediate transfer recording medium is not sufficiently cut while the transfer at a high speed is progressing. For example, the edge of the transfer portion is not uniform. However, there is a problem in practical use due to unevenness in the transfer portion. Therefore, the present invention solves the above problems, at least in the intermediate transfer recording medium in which a release layer, an ionizing radiation curable resin layer, and a receiving layer are sequentially provided on the base film, even under severe use conditions, The thermal transfer image of the obtained print is excellent in various durability, the transfer film of the intermediate transfer recording medium is well cut, and the transfer target is deformed between the transfer portion and the non-transfer portion of the intermediate transfer recording medium. It is an object of the present invention to provide an intermediate transfer recording medium and a printed matter which prevent the above.

[0008]

To achieve the above object, the present invention provides an intermediate transfer recording medium in which at least a release layer, an ionizing radiation curable resin layer, and a receiving layer are sequentially provided as a transfer portion on a base film. In, the ionizing radiation curable resin layer was made of a urethane-modified acrylic resin. It is preferable that the ionizing radiation curable resin layer contains 5 to 40 parts by weight of the oligomer per 100 parts by weight of the urethane-modified acrylic resin. Further, the printed matter of the present invention is obtained by forming a thermal transfer image on a transfer part of the intermediate transfer recording medium using the above-mentioned intermediate transfer recording medium and transferring the transfer part to a transfer target. .

The intermediate transfer recording medium of the present invention comprises a release layer, an ionizing radiation curable resin layer, and a receiving layer which are sequentially provided as a transfer portion on at least a substrate film, and the ionizing radiation curable resin layer is a urethane-modified acrylic. It was made of a system resin. The resin layer is a film that is crosslinked by being irradiated with ultraviolet rays or electron beams and is strong and has a three-dimensional network structure with excellent durability. Further, it is particularly preferable that the ionizing radiation curable resin layer contains 5 to 40 parts by weight of the oligomer per 100 parts by weight of the urethane-modified acrylic resin, whereby the protective layer after being transferred to the transfer target is obtained. As a result, the transfer target can be prevented from being deformed between the transfer portion and the non-transfer portion of the intermediate transfer recording medium.
(It is considered to be deformation due to the difference in shrinkage ratio between the transfer portion and the non-transfer portion.) The intermediate transfer recording medium of the present invention transfers at least a release layer, an ionizing radiation-curable resin layer, and a receiving layer on a base film in order. Since the transfer portion is formed as a portion, the transfer portion has no transfer unevenness on the transfer-receiving member, and the edge of the transfer portion is uniform, so that an excellent transfer property can be obtained.

[0010]

1 is a sectional view showing one embodiment of an intermediate transfer recording medium of the present invention. The intermediate transfer recording medium 1 is composed of a base film 2 and a transfer section 6 which is provided on the base film 2 in a peelable manner. The transfer section 6 is separated from the base film 2 side by a release layer 3 and an ionization layer. The radiation curable resin layer 4 and the receiving layer 5 are formed in this order. Figure 2
1 is a cross-sectional view showing one embodiment of a printed matter of the present invention, in which a receptive layer 5 having a thermal transfer image 8 formed thereon, an ionizing radiation curable resin layer 4, and a release layer 3 are provided on a transferred body 9. It is a printed matter 7. In this printed matter, a thermal transfer image is formed in advance on a receiving layer of an intermediate transfer recording medium as shown in FIG. 1 by using a thermal transfer sheet, and thereafter, the receiving layer on which the image is formed and the transferred material are formed. So that they are in contact with each other, the receptor layer, the ionizing radiation curable resin layer, and the release layer are transferred from the intermediate transfer recording medium to the transferred material. Thereby, the receiving layer, the ionizing radiation curable resin layer, and the release layer are laminated on the transferred body so as to cover the thermal transfer image.

The elements constituting the intermediate transfer recording medium will be described below. (Base film) Base film 2
The same base film as that used for the conventional intermediate transfer recording medium can be used as it is without any particular limitation. Specific examples of the preferable substrate film 2 include thin paper such as glassine paper, condenser paper or paraffin paper, or polyethylene terephthalate,
Polyethylene naphthalate, polybutylene terephthalate, polyphenylene sulfide, high heat-resistant polyester such as polyether ketone or polyether sulfone, polypropylene, polycarbonate, cellulose acetate, polyethylene derivative, polyvinyl chloride, polyvinylidene chloride, polystyrene, polyamide, polyimide Examples include stretched and unstretched films of plastics such as polymethylpentene and ionomers. A composite film in which two or more of these materials are laminated can also be used. The thickness of the base material film 2 can be appropriately selected depending on the material so that the strength, heat resistance and the like are appropriate, but normally, a thickness of about 1 to 100 μm is preferably used. If necessary, a back layer can be provided on the surface of the base film opposite to the transfer portion side by a conventionally known method. The back surface layer is conventionally used to prevent fusion between the base material film and a heating device such as a thermal head when transferring a transfer portion to a transfer target using an intermediate transfer recording medium and to improve slidability. It can be provided by a resin similar to the resin used.

(Release Layer) The release layer 3 is usually a mixture of acrylic skeleton resin, vinyl chloride-vinyl acetate copolymer, cellulose acetate and thermosetting acrylic resin, melamine resin, nitrocellulose resin, and polyethylene wax. It is preferable that the main component is an acrylic skeleton resin. Further, polyester resin or the like is preferably used in order to adjust the adhesion between the release layer and the substrate film. The release layer is prepared by, for example, dissolving or dispersing an acrylic skeleton resin and a polyester resin in a suitable solvent to prepare a release layer coating solution, which is gravure-printed, screen-printed or gravure-printed on a base film. It can be formed by coating and drying by means such as the reverse coating method used. The thickness after drying is usually 0.1 to 10 μm.

The release layer can be provided on the substrate film instead of the above-mentioned release layer, and is usually formed of a binder resin and a release material. Examples of the binder resin include thermoplastic resins such as polymethyl methacrylate, polyethyl methacrylate, acrylic resins such as polybutyl acrylate, polyvinyl acetate, vinyl chloride-vinyl acetate copolymer, polyvinyl alcohol, polyvinyl butyral and the like. Vinyl resin, ethyl cellulose, nitrocellulose,
A cellulose derivative such as cellulose acetate, or an unsaturated polyester resin which is a thermosetting resin, a polyester resin, a polyurethane resin, an aminoalkyd resin, or the like can be used. Further, as the releasing material, waxes, silicone wax, silicone resin, melamine resin, fluorine resin, fine powder of talc or silica, lubrication of surfactant, metal soap and the like can be used. The release layer is prepared by dissolving or dispersing the above resin in a suitable solvent to prepare a release layer coating solution, which is reverse-printed on a base film using a gravure printing method, a screen printing method or a gravure plate. It can be formed by coating and drying by means such as a coating method. The thickness after drying is usually 0.1 to 1
It is 0 μm.

(Ionizing radiation curable resin layer) The intermediate transfer recording medium of the present invention comprises a base film, at least a release layer, and
This is a structure in which an ionizing radiation curable resin layer and a receiving layer are sequentially provided as a transfer section. The ionizing radiation curable resin layer 4 mainly exhibits the function of imparting various durability to the thermal transfer image in the transfer section 6. This ionizing radiation curable resin layer is made of an ionizing radiation curable resin, and is specifically as shown below. As ionizing radiation curable resin,
Polymerizable unsaturated bond such as (meth) acryloyl group, (meth) acryloyloxy group ((meth) acryloyl is used in the meaning of acryloyl or methacryloyl, and (meth) has the same meaning) in the molecule) Alternatively, a composition in which a prepolymer having an epoxy group, an oligomer, and / or a monomer is appropriately mixed is used. Examples of these prepolymers and oligomers include urethane (meth) acrylate, polyester (meth) acrylate, acrylate such as epoxy (meth) acrylate, silicon resin such as siloxane, unsaturated polyester, epoxy and the like.

Examples of the monomer include styrene, styrene-based monomers such as α-methylstyrene, methyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, dipentaerythritol hexa (meth) acrylate, and dimethacrylate. Pentaerythritol penta (meth) acrylate, trimethylolpropane tri (meth) acrylate, and / or a polyol compound having two or more thiol groups in the molecule, for example, trimethylolpropane trithioglycolate, trimethylolpropane trithiopropyl Rate, pentaerythritol tetrathioglycol and the like. The above compounds may be used alone or in admixture of two or more, if necessary, but in order to impart ordinary coating suitability to the resin composition, 5% by weight or more of the prepolymer or oligomer, and the monomer And / or the polythiol content is preferably 95% by weight or less.

When flexibility of the cured product is required in selecting the monomer, the monomer may be used within a range that does not hinder various durability of the ionizing radiation curable resin layer and coating suitability. The amount is reduced, or a monofunctional or bifunctional acrylate monomer is used to provide a structure having a relatively low crosslinking density. When heat resistance, hardness, solvent resistance, etc. of the cured product are required, increase the amount of the monomer within a range that does not hinder the coating suitability, or use a trifunctional or higher functional acrylate monomer. It is preferable that the structure has a high cross-linking density. The coating suitability and the physical properties of the cured product can be adjusted by mixing a mono- or di-functional monomer and a tri- or more functional monomer.

Examples of the monofunctional acrylate type monomer as described above include 2-hydroxy acrylate, 2-hexyl acrylate and phenoxyethyl acrylate. Examples of the bifunctional acrylate-based monomer include ethylene glycol diacrylate and 1,6-hexanediol diacrylate, and examples of the trifunctional or higher-functional acrylate-based monomer include trimethylolpropane triacrylate, pentaerythritol hexaacrylate, and dipentadiene. Examples thereof include erythritol hexaacrylate.

In order to adjust the physical properties such as flexibility and surface hardness of the cured product, the following ionizing radiation non-curable resin is used for at least one of the prepolymer, oligomer and monomer. Can be used by mixing about 1 to 50% by weight. As the ionizing radiation non-curable resin, a thermoplastic resin such as urethane-based, fibrin-based, polyester-based, acrylic-based, butyral-based, polyvinyl chloride, or polyvinyl acetate can be used. The ionizing radiation curable resin layer of the thermal transfer sheet of the present invention is an ionizing radiation curable resin, and a urethane-modified acrylic resin ionizing radiation curable resin is preferable. Furthermore, the urethane-modified acrylic resin 100
Ionizing radiation curable resins containing 5 to 40 parts by weight of oligomer per part by weight are preferred. The urethane-modified acrylic resin is a urethane-modified acrylic resin in which a hydroxyl group (-OH) existing in the acrylic resin and an isocyanate (-NCO) react to have a urethane bond in the resin. It is preferable that the oligomer is contained in an amount of 5 to 40 parts by weight per 100 parts by weight, whereby an excellent function having both flexibility and durability as a transfer protection layer can be obtained. In the above expression, it is easy to think that only the oligomer is added,
As a matter of course, not only the oligomer but also the monomer may be added. When the amount of the oligomer used is small, the strength and durability of the obtained resin layer are not sufficient,
On the other hand, if the amount of the oligomer is too large, the tackiness of the surface of the resin layer becomes high and the blocking tends to occur, which is not preferable.

When the above ionizing radiation curable resin is cured by irradiation with ionizing radiation, it is necessary to use a transparent resin. Further, as a photopolymerization initiator in the ionizing radiation curable resin composition, acetophenones, benzophenones, Michler benzoyl benzoate, α-amyloxime ester, tetramethylmeuram monosulfide, thioxanthones, and / or photosensitizers. It is also possible to use a mixture of n-butylamine, triethylamine, tri-n-butylphosphine and the like. In consideration of releasability, it is desirable to mix silicone resin, wax, fluororesin, melanin resin, surfactant and the like.

In the present invention, ultraviolet rays are the main method for completely curing the ionizing radiation curable resin layer formed on the substrate film with the resin composition containing the ionizing radiation curable resin. Among the charged particle beams, ionizing radiation having an energy quantum capable of polymerizing and crosslinking molecules, and visible rays, γ rays, and X rays can also be used. An ultraviolet irradiation device is usually used as the ionizing radiation irradiation device. Ultraviolet irradiation devices include ultra high pressure mercury lamps, high pressure mercury lamps, low pressure mercury lamps, carbon arcs, black lights,
A light source such as a metal halide lamp is used. Depending on the device, 100-1000 KeV, preferably 100-1000 KeV
Irradiate with electrons having an energy of 300 KeV. The irradiation dose is usually 5 to 300 KGy (kilo gray)
It is a degree.

The ionizing radiation curable resin layer is an ink for forming an ionizing radiation curable resin layer obtained by dissolving or dispersing the composition of the ionizing radiation curable resin layer containing the above-described ionizing radiation curable resin in a suitable solvent. Can be prepared by coating the above base film with a forming means such as a gravure printing method, a screen printing method, a reverse coating method using a gravure plate, etc., and drying. The ionizing radiation-curable resin layer can be formed on the substrate film to have an arbitrary thickness, but the thickness after drying is 0.
It is 1 to 50 g / m ² , and preferably about 1 to ²⁰ g / m ² .

(Receiving Layer) The receiving layer 5 is provided as a part of the transfer portion constituting the intermediate transfer recording medium so as to be located on the outermost surface opposite to the base film side. An image is formed on the receiving layer from the thermal transfer sheet having the color material layer by thermal transfer by thermal transfer. Then, the transfer portion of the intermediate transfer recording medium on which the image is formed is transferred to the transfer target, and as a result, a printed matter is formed. For this reason,
As a material for forming the receiving layer, a conventionally known resin material that easily accepts a heat transferable coloring material such as a sublimable dye or a hot melt ink can be used. For example, polyolefin resin such as polypropylene, halogenated resin such as polyvinyl chloride or polyvinylidene chloride, polyvinyl acetate, vinyl chloride-vinyl acetate copolymer, ethylene-vinyl acetate copolymer or polyacrylic ester Vinyl resin, polyester resin such as polyethylene terephthalate or polybutylene terephthalate, polystyrene resin, polyamide resin, copolymer resin of olefin such as ethylene or propylene and other vinyl polymer, cellulose resin such as ionomer or cellulose diastase , Polycarbonate, etc., particularly, vinyl chloride resin, acrylic-
Styrenic resins or polyester resins are preferred.

When the receptive layer is transferred to the transferred material via the adhesive layer, the adhesiveness of the receptive layer itself is not always required. However, when the receiving layer is transferred to the transfer target without passing through the adhesive layer, it is preferable to form the receiving layer using a resin material having an adhesive property such as a vinyl chloride-vinyl acetate copolymer. The receiving layer is coated with a single or a plurality of materials selected from the above-mentioned materials and various additives as necessary, and dissolved or dispersed in an appropriate solvent such as water or an organic solvent to form a coating for the receiving layer. A liquid can be prepared and applied and dried by a means such as a gravure printing method, a screen printing method or a reverse coating method using a gravure plate to form the liquid. Its thickness is 1 in the dry state
It is about 10 g / m ² .

(Transfer Body) Next, the transfer body 9 will be described. The transfer portion on which the thermal transfer image of the above-mentioned intermediate transfer recording medium is formed is transferred onto the transfer target, and as a result,
A printed matter having a thermal transfer image with excellent durability can be obtained. The material to which the intermediate transfer recording medium of the present invention is applied is not particularly limited, and includes, for example, natural fiber paper, coated paper, tracing paper, plastic film that is not deformed by heat during transfer, glass, metal, ceramics, wood. , Cloth, etc. may be used.

Regarding the shape and use of the transferred material, stock certificates,
Securities, certificates, passbooks, tickets, train tickets, stamps, stamps, appreciation tickets, admission tickets, cash vouchers such as tickets, credit cards, prepaid cards, members' cards, greeting cards, postcards, business cards, driver's licenses Certificates, IC cards, cards such as optical cards, cartons, cases such as containers, bags, forms, envelopes, tags, OHP sheets, slide films, bookmarks, calendars, posters, brochures, menus, passports, POP supplies , Coasters, displays, name plates, keyboards, cosmetics, wristwatches, accessories such as lighters, stationery, report paper, stationery, building materials, panels, emblems, keys, cloth, clothing, footwear, radio, TV, calculators, OA equipment, etc. Equipment, sample books, albums, computer graphs The output of the box, medical image output, etc., do not ask type.

When forming a thermal transfer image when obtaining the printed matter of the present invention, first, the above-mentioned intermediate transfer recording medium and a thermal transfer sheet having a color material layer provided on a base material are prepared, and a thermal transfer sheet is prepared. Between the heating device such as the head and the platen roll, the intermediate transfer recording medium transfer part and the color material layer of the thermal transfer sheet are pressed against each other, and the heating part of the heating device is selectively heated according to the image information. Then, the color material of the color material layer on the thermal transfer sheet is transferred to the receiving layer of the intermediate transfer recording medium to record an image. A conventionally known thermal transfer sheet can be used. The color material layer provided on the thermal transfer sheet is formed of a heat-meltable ink or an ink containing a sublimation dye. The color material layer is provided by being appropriately selected from a heat-meltable ink and a sublimation dye ink according to the intended printed matter. The coloring material layer made of a sublimation type dye used for obtaining a printed matter having excellent gradation is a surface-sequentially used sublimation dye of each commonly used yellow, magenta, cyan, black, etc. It can be provided in the. In the case of monochromatic binary images such as letters and numbers, a thermal transfer sheet provided with a coloring material layer made of a heat-fusible ink having excellent density and sharpness is used alone.
Alternatively, a heat-meltable ink layer may be provided in a surface-sequential manner with the coloring material layer made of the sublimation dye and used.

As described above, a thermal transfer image is formed on the transfer portion of the intermediate transfer recording medium as a bust (not the image on the final printed matter, but the final image as seen on a mirror). , The transfer part on which the thermal transfer image is formed is pressed so that the image surface of the transfer part is in contact with the transfer target, and the transfer part is covered by a heating means such as a thermal head, a hot stamp, or a heat roll. Transfer to a transfer body. In the above-mentioned heating means of the transfer portion, it is desirable to use a thermal head or hot stamp means for partial transfer, and it is desirable to use a hot roll method when transferring to the entire surface of the transfer target. As a result, a printed matter is formed by stacking the receiving layer and the ionizing radiation curable resin layer on the transfer target so as to cover the thermal transfer image. (See Figure 2)

In order to form the above-mentioned printed matter of the present invention, a transfer portion containing a specified thermal transfer image is transferred and formed on a transfer target at a predetermined position of the transfer target. In order to accurately align the thermal transfer of each color at the time of thermal transfer of a thermal transfer image, a detection mark which is conventionally used for position detection at each transfer is provided on the intermediate transfer recording medium, and a detector is provided. It is preferable that the position of the thermal transfer is detected by detecting the position in step S1, and the position of the thermal transfer is aligned with the thermal transfer device.

[0029]

Example 1 First, transparent polyethylene terephthalate having a thickness of 12 μm was used as a base film,
The release layer coating liquid described below was applied to the surface by a gravure reverse coating method and dried to form a release layer having a thickness of 1.0 g / m ² on the substrate film. (Coating liquid for release layer) Acrylic resin (methyl methacrylate) 80 parts Polyester resin 4 parts Methyl ethyl ketone 100 parts Toluene 100 parts

On the release layer, an ionizing radiation-curable resin layer coating solution having the following composition was applied by a gravure coating method to form an ionizing radiation-curable resin layer having a dry coating amount of 4.0 g / m ^2. Then, a receiving layer coating liquid having the following composition was applied onto the cured resin layer by a gravure coating method to form a receiving layer having a coating amount of 2.0 g / m ² when dried. An intermediate transfer recording medium was produced. However, the drying after coating each layer of the intermediate transfer recording medium is hot air drying which is usually used, but in the case of an ionizing radiation curable resin layer, after coating, hot air drying, and then an ultraviolet irradiation device (ozone). Output used 1
Ultraviolet rays were irradiated by using a 20 W / cm high pressure mercury lamp. On the other surface (back surface side) of the substrate film, a heat resistant slipping layer having a coating amount of 2.0 g / m ² when dried was coated by a gravure coating method with a heat resistant slipping layer coating solution having the following composition. The heat-resistant slip layer is formed in advance and, after coating, is heat-aged and cured.

[0031] (Coating liquid for ionizing radiation curable resin layer)   Urethane-based acrylic resin 100 parts   Polyfunctional urethane acrylate 20 parts   100 parts of methyl ethyl ketone   100 parts of toluene

[0032] (Receptor layer coating liquid)   Vinyl chloride-vinyl acetate copolymer 40 parts   Acrylic silicone 1.5 parts   Methyl ethyl ketone 50 parts   Toluene 50 parts

[0033] (Coating liquid for heat resistant slipping layer)   Polyvinyl butyral resin 3.6 parts (Sekisui Chemical Co., Ltd., S-REC BX-1)   Polyisocyanate 19.2 parts (Burnock D750-45, manufactured by Dainippon Ink and Chemicals, Inc.)   Phosphate ester type surfactant 2.9 parts (Daiichi Kogyo Seiyaku Co., Ltd., Prisurf A208S)   Phosphate ester type surfactant 0.3 parts (Toho Chemical Co., Ltd., phosphanol RD720)   Talc (manufactured by Nippon Talc Co., Ltd.) 0.2 parts   Methyl ethyl ketone 33 parts   33 parts of toluene

Comparative Example 1 An ionizing radiation curable resin layer of the intermediate transfer recording medium prepared in Example 1 was changed to a coating liquid for a thermal transfer resin layer having the following composition, and otherwise the same as in Example 1 for comparison. The intermediate transfer recording medium of Example 1 was produced. (Coating liquid for thermal transfer resin layer) Polyester resin (U-18, manufactured by Arakawa Chemical Co., Ltd.) 20 parts Methyl ethyl ketone 50 parts Toluene 50 parts

Next, a print product for evaluation was prepared under the following conditions. Each of yellow, magenta, and cyan obtained by color-separating a facial photograph with a thermal transfer sheet provided with a standard dye layer for a VDS card printer CP510 using a card thermal printer (Card Printer CP510 / VDS) In accordance with the image information of 1., each dye was transferred onto the receiving layer of the intermediate transfer recording medium of the above-prepared Examples and Comparative Examples to form a full-color facial photograph image.

Then, the receptive layer containing the thermal transfer image and the ionizing radiation curable resin layer (the thermal transfer resin layer in the comparative example) obtained above were applied to a transfer target composed of a card base material having the following composition, and the same thermal for card as above was used. Transferred with a printer (using the same thermal head). <Material composition of card base material> Polyvinyl chloride compound (polymerization degree 800) 100 parts (containing about 10% of additives such as stabilizer) White pigment (titanium oxide) 10 parts Plasticizer (DOP) 0.5 part

(Evaluation Results) The printed matter having the ionizing radiation curable resin layer on the image obtained in Example 1 has various durability such as light resistance, chemical resistance, plasticizer resistance, solvent resistance and weather resistance. Regarding the property, it was a very good result even under the condition of assuming severe usage conditions. Further, in Example 1, when the transfer portion was transferred from the intermediate transfer recording medium to the transfer target, film breakage was good, the transfer was performed uniformly, and the edge of the transferred transfer portion was sharp. On the other hand, the printed matter having the resin layer on the image obtained in Comparative Example 1 has severe durability such as light resistance, chemical resistance, plasticizer resistance, solvent resistance and weather resistance. The conditions that assumed the conditions were not satisfactory.

[0038]

As described above, the intermediate transfer recording medium of the present invention has a structure in which at least a release layer, an ionizing radiation-curable resin layer, and a receiving layer are sequentially provided as a transfer portion on a substrate film, Since the radiation curable resin layer is made of urethane modified acrylic resin, the resin layer is cross-linked by being irradiated with ultraviolet rays or electron beams, and becomes a film having a strong three-dimensional network structure with excellent durability. . It is particularly preferable that the ionizing radiation curable resin layer contains 5 to 40 parts by weight of the oligomer per 100 parts by weight of the urethane-modified acrylic resin, so that the thermal transfer image after being transferred to the transfer target is obtained. The protective layer was excellent in flexibility and could prevent the transferred body from being deformed between the transfer portion and the non-transfer portion of the intermediate transfer recording medium. The intermediate transfer recording medium of the present invention has at least the release layer, the ionizing radiation curable resin layer, and the receiving layer formed on the base material film as the transfer portion in this order, so that the transfer portion has no transfer unevenness to the transfer target, In addition, the edge of the transfer portion was uniform, and the transfer property was excellent.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing one embodiment of an intermediate transfer recording medium of the present invention.

FIG. 2 is a schematic cross-sectional view showing one embodiment of a printed matter of the present invention.

[Explanation of symbols]

1 Intermediate transfer recording medium 2 Base film 3 Release layer 4 Ionizing radiation curable resin layer 5 Receptive layer 6 Transfer part 7 Prints 8 (Thermal transfer) image 9 Transferee

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kozo Odamura             1-1-1, Ichigaya-Kagacho, Shinjuku-ku, Tokyo             Dai Nippon Printing Co., Ltd. (72) Inventor Takayuki Imai             1-1-1, Ichigaya-Kagacho, Shinjuku-ku, Tokyo             Dai Nippon Printing Co., Ltd. (72) Inventor Etsuo Takasaki             1-1-1, Ichigaya-Kagacho, Shinjuku-ku, Tokyo             Dai Nippon Printing Co., Ltd. F term (reference) 2C005 HA07 HA10 HA13 HB01 HB03                       HB04 HB13 HB20 KA01 KA03                       KA61 KA70 LA20 LA30                 2H111 AA08 AA26 AA27 AB07 CA02                       CA04 CA25 CA30

Claims (3)

[Claims] 1. An intermediate transfer recording medium in which a release layer, an ionizing radiation curable resin layer, and a receiving layer are sequentially provided as a transfer portion on at least a substrate film, and the ionizing radiation curable resin layer is composed of a urethane-modified acrylic resin. An intermediate transfer recording medium characterized by the above. 2. The ionizing radiation curable resin layer comprises 5 oligomers per 100 parts by weight of urethane modified acrylic resin.
The intermediate transfer recording medium according to claim 1, wherein the content of the intermediate transfer recording medium is 40 to 40 parts by weight. 3. A thermal transfer image is formed on a transfer portion of the intermediate transfer recording medium by using the intermediate transfer recording medium according to claim 1 or 2, and the transfer portion is transferred to a transfer target. A print product characterized by that.