JP5757400B2 - Thermal transfer image-receiving sheet for sublimation transfer - Google Patents

Description

  The present invention relates to a thermal transfer image-receiving sheet for sublimation transfer, and more specifically, a base sheet, a porous layer, a dye-receiving layer, and the other of the base sheet on one side of the base sheet. The present invention relates to a thermal transfer image receiving sheet having a non-porous layer, a back primer layer, and a back layer on the surface.

  Conventionally, among various thermal transfer recording systems, a thermal sublimation transfer system and a thermal fusion transfer system have been widely used. Among these, the heat-sensitive sublimation transfer method uses a sublimation dye as a color material, and uses a heating device such as a thermal head that controls heat generation according to image information, using a sublimation dye layer formed on a thermal transfer sheet. The dye inside is transferred to the thermal transfer image-receiving sheet to form an image.

  According to this heat-sensitive sublimation transfer method, the amount of dye transfer can be controlled in dot units by heating for an extremely short time. In addition, since the coloring material is a dye, it also has excellent transparency, and the formed image is very clear and at the same time has excellent halftone reproducibility and gradation, so it has extremely high definition. A high-quality image comparable to a full-color silver salt photograph can be obtained.

  As a thermal transfer image-receiving sheet for sublimation transfer (hereinafter referred to as a thermal transfer image-receiving sheet) used in such a heat-sensitive sublimation type transfer system, a sheet in which a color material receiving layer is formed on a base sheet is generally used. Yes. This thermal transfer image-receiving sheet is required to obtain a high-density, high-resolution image without curling, density unevenness, and missing dots. In view of this, a thermal transfer image-receiving sheet using a substrate sheet in which surface films are laminated on both surfaces of a core material has been proposed (see, for example, Patent Document 1). However, such a thermal transfer image-receiving sheet has not been sufficiently conveyed during printing by a grip roller printer. Therefore, in order to improve the transportability, a thermal transfer image receiving sheet provided with a grip layer on the back surface has been proposed (for example, see Patent Document 2). However, even such an image receiving sheet is not sufficiently transportable, and further improvements in transportability have been demanded. Accordingly, there is still a strong demand for the development of a thermal transfer image receiving sheet that can improve the transportability during printing by a grip roller type printer and realize high image quality.

JP-A-4-275193 JP-A-11-115328

  The present invention has been made in view of the above-described background art, and an object thereof is to improve physical properties required for the back side of the thermal transfer image receiving sheet. More specifically, an object of the present invention is to provide a thermal transfer image-receiving sheet that improves transportability at the time of printing by a grip roller type printer, has no image shift, and can realize high image quality. Furthermore, it is providing the thermal transfer image receiving sheet excellent in the writability to a back surface.

  In order to solve the above-mentioned problems, the present inventors have conducted intensive studies. As a result, in a thermal transfer image-receiving sheet comprising a base sheet and a porous layer and a dye-receiving layer on one surface of the base sheet. The present invention has found that the above problem can be solved by providing a non-porous layer made of a mat-like non-porous film, a back primer layer, and a back layer on the other surface of the base sheet. It came to be completed.

That is, according to one aspect of the present invention,
A base sheet;
On one side of the base sheet, a porous layer, a dye receiving layer,
There is provided a thermal transfer image-receiving sheet comprising a non-porous layer made of a mat-like non-porous film, a back primer layer, and a back layer on the other surface of the base sheet.

  According to the thermal transfer image receiving sheet of the present invention, the physical properties required for the back surface side can be improved by forming the back surface side of the thermal transfer image receiving sheet into the multilayer structure as described above. More specifically, the thermal transfer image-receiving sheet of the present invention improves the transportability at the time of printing by a grip roller type printer, so that high image quality can be realized without image displacement. Furthermore, the thermal transfer image-receiving sheet of the present invention is excellent in writing on the back surface.

It is a schematic cross section which shows an example of the thermal transfer image receiving sheet by this invention.

Thermal transfer image-receiving sheet The thermal transfer image-receiving sheet of the present invention comprises a base sheet, a porous layer on one side of the base sheet, a dye receiving layer, and a non-porous layer on the other side of the base sheet. And a back surface primer layer and a back surface layer. An adhesive layer may be further provided between the base sheet and the porous layer or between the base sheet and the non-porous layer. Further, a primer layer may be further provided between the porous layer and the dye receiving layer.

  According to one aspect of the present invention, a base sheet, an adhesive layer, a porous layer, a primer layer, a dye receiving layer, and the other side of the base sheet on one side of the base sheet. And an adhesive layer, a non-porous layer, a back primer layer, and a back layer. Specifically, FIG. 1 shows a schematic sectional view of an example of the thermal transfer image receiving sheet according to the present invention. A thermal transfer image-receiving sheet 10 shown in FIG. 1 includes a base sheet 11, an adhesive layer 12, a porous layer 13, a primer layer 14, and a dye receiving layer 15 on one surface of the base sheet 11. It has in order. Moreover, it has the adhesive layer 16, the non-porous layer 17, the back surface primer layer 18, and the back surface layer 19 in this order on the other surface of the base material sheet 11. Hereinafter, each layer constituting the thermal transfer image receiving sheet of the present invention will be described in detail.

Base Sheet It is preferable to use a coated paper for the base sheet in the present invention. Since the base sheet has a role of holding the dye-receiving layer and heat is applied during thermal transfer, the base sheet preferably has a mechanical strength that does not hinder handling even in a heated state. The base sheet preferably has a thickness of 110 μm or more and 150 μm or less, more preferably 120 μm or more and 140 μm or less. If the thickness of the base sheet is within the above range, the amount of curling due to environmental changes (especially humidity changes) of the printed image on the image receiving paper is reduced to improve the quality after storage in each environment. it can.

The above coated paper is a high quality paper produced with 100% chemical pulp or a medium quality paper produced with 70% or more chemical pulp as a base paper, and a white pigment such as white clay or calcium carbonate on the surface of the base paper, In order to improve smoothness after applying a paint made by mixing an adhesive such as starch with a coating device (coater, etc.) usually provided in the middle of the paper machine in the paper manufacturing process It is produced by applying a calendar process. By such treatment, whiteness, smoothness, gloss, opacity, and the like can be improved. The above coated paper, preferably as a solid content coating amount of the coating material containing a pigment 5 to 30 g / ^{m 2,} more preferably from 10 to 20 g / ^{m 2.} If the coating amount is 5 g / m ² or more, sufficient whiteness, smoothness, gloss, and opacity can be obtained. The coating amount is preferably 30 g / m ² or less from the viewpoints of low cost and light weight. There are various types of coated paper, such as single coat (single-sided coating) and double-coated (double-sided coating). In the present invention, it is preferable to use both coats.

  In the present invention, commercially available coated paper can also be used. For example, Aurora coat, Thunderbird coat N, Mu coat, Mu white, OK top coat +, OK top coat S, OK top coat mat N, OK royal coat, OK top coat dull, POD gloss coat, POD mat coat, Utrilo coat, pearl coat, white pearl coat, New Age, New Age W, Z coat, Silver diamond, Eulite, Neptune, Mu mat, White mu mat, Thunderbird mat Coat N, Utrilog loss mat, New V mat, White New V mat and the like are preferable.

Porous layer The porous layer in this invention consists of a porous film. The porous film preferably has a thickness of 20 μm or more and 38.5 μm or less, more preferably 35 μm or more and 38.5 μm or less. Further, the porous film is preferably a porous film containing a polypropylene resin as a base resin and having fine voids inside. By providing a porous layer made of a porous film having such a thickness and containing a polypropylene resin, the amount of curl change due to environmental changes (particularly humidity changes) of the printed image of the image receiving paper can be reduced. Thus, the quality after storage in each environment can be improved.

  As a method for producing fine voids in the film, a compound is prepared by kneading organic fine particles or inorganic fine particles (one kind or plural kinds) incompatible with the resin as the base of the film. Microscopically, this compound forms a fine sea-island structure with the base resin and fine particles incompatible with the base resin, and the compound is formed into a film and stretched to form the sea-island interface. The fine voids as described above are generated by the peeling of the film or the large deformation of the region forming the island.

  As a method for forming the fine voids, for example, a method in which polypropylene is mainly used and polyester or acrylic resin having a melting point higher than that of polypropylene is added thereto. In this case, polyester or acrylic resin serves as a nucleating agent that forms fine voids. It is preferable that content of this polyester and an acrylic resin is 2-10 mass parts with respect to 100 mass parts of polypropylene in any case. When the content is 2 parts by mass or more, fine voids can be sufficiently generated, and the printing sensitivity can be further improved. Moreover, when content is 10 mass parts or less, the heat resistance of a porous film can fully be ensured.

  Moreover, when producing the porous film which uses polypropylene as the base resin, it is preferable to further add polyisoprene in order to generate more fine and dense voids. Thereby, higher printing sensitivity can be obtained. For example, a porous film having high printing sensitivity can be obtained by preparing a compound composed mainly of polypropylene, blended with acrylic resin or polyester, and polyisoprene, forming a compound, and stretching.

Dye Receiving Layer The dye receiving layer in the present invention is for receiving the sublimation dye transferred from the thermal transfer sheet and maintaining the formed image. Examples of the resin for forming the dye receiving layer include polycarbonate resin, polyester resin, polyamide resin, acrylic resin, cellulose resin, polysulfone resin, polyvinyl chloride resin, polyvinyl acetate resin, and vinyl chloride. Examples thereof include vinyl acetate copolymer resin, polyvinyl acetal resin, polyvinyl butyral resin, polyurethane resin, polystyrene resin, polypropylene resin, polyethylene resin, ethylene-vinyl acetate copolymer resin, and epoxy resin.

  The thermal transfer image-receiving sheet of the present invention can have a release agent in the dye-receiving layer in order to improve releasability from the thermal transfer sheet. Various release agents such as polyethylene wax, amide wax, solid waxes such as Teflon (registered trademark), fluorine or phosphate surfactants, silicone oils, reactive silicone oils, curable silicone oils, etc. Silicone oil and various silicone resins can be mentioned, and silicone oil is preferable. An oily oil can be used as the silicone oil, but a modified silicone oil is preferred. As the modified silicone oil, amino-modified silicone, epoxy-modified silicone, aralkyl-modified silicone, epoxy-aralkyl-modified silicone, alcohol-modified silicone, vinyl-modified silicone, urethane-modified silicone and the like can be preferably used. Epoxy-aralkyl-modified silicones are particularly preferred. It is also preferable to use a combination of two or more of these release agents. The amount of these modified silicone oils added is preferably 0.5 to 30% by mass of the resin constituting the dye-receiving layer.

  In forming the dye-receiving layer, pigments such as titanium oxide, zinc oxide, kaolin, clay, calcium carbonate, and fine powdered silica are used for the purpose of improving the whiteness of the dye-receiving layer and further enhancing the sharpness of the transferred image. Fillers can be added. Moreover, you may add plasticizers, such as a phthalic acid ester compound, a sebacic acid ester compound, and a phosphoric acid ester compound.

According to the release layer another embodiment, at least a portion of the surface of the dye receiving layer, was coated on dissolving or dispersing the above release agent in a suitable solvent, by drying, a release layer further It can also be provided. The release agent constituting the release layer is particularly preferably a reaction cured product of an amino-modified silicone oil and an epoxy-modified silicone oil, and the thickness of the release agent layer is 0.01 to 5.0 μm, particularly 0.05. -2.0 micrometers is preferable. In addition, when a silicone oil is added and formed when forming the dye receiving layer, the release layer can be formed even if the silicone oil bleed out on the surface after coating is cured. In forming the dye-receiving layer, titanium oxide, zinc oxide, kaolin, clay, calcium carbonate, fine powder silica, etc. are used for the purpose of improving the whiteness of the dye-receiving layer and further enhancing the clarity of the transferred image. Pigments and fillers can be added. Further, a plasticizer such as a phthalic acid ester compound, a sebacic acid ester compound, and a phosphoric acid ester compound may be added.

Primer layer The primer layer in the present invention is provided between the dye-receiving layer and the porous film, and the adhesion between the dye-receiving layer and the porous film, whiteness, cushioning property, concealing property, antistatic property, Further, the purpose is to impart anti-curling properties. In the present invention, any conventionally known primer layer can be provided. The binder resin used for the primer layer is polyurethane resin, polyester resin, polycarbonate resin, polyamide resin, acrylic resin, polystyrene resin, polysulfone resin, polyvinyl chloride resin, polyvinyl acetate resin, polyvinyl chloride- Examples include vinyl acetate copolymer resin, polyvinyl acetal resin, polyvinyl butyral resin, polyvinyl alcohol resin, epoxy resin, cellulose resin, ethylene-vinyl acetate copolymer resin, polyethylene resin, and polypropylene resin. Of the resins having an active hydroxyl group, those isocyanate cured products can be used as a binder.

Moreover, it is preferable to add fillers such as titanium oxide, zinc oxide, magnesium carbonate, and calcium carbonate in order to impart whiteness and concealment. Furthermore, stilbene compounds, benzimidazole compounds, and benzoxazole compounds are added as fluorescent brightening agents to enhance whiteness, and hindered amine compounds and hindered phenol compounds are used to increase the light fastness of printed materials. Add compounds, benzotriazole compounds, benzophenone compounds, etc. as UV absorbers or antioxidants, or add cationic acrylic resins, polyaniline resins, and various conductive fillers to impart antistatic properties can do. The coating amount of the primer layer is preferably about 0.5 to 5 g / m ^{2 in} a dry state.

Non-porous layer The non-porous layer in the present invention is made of a matte non-porous film. By using a mat-like non-porous film with irregularities on the surface as a non-porous layer, the thermal transfer image-receiving sheet has irregularities with an appropriate roughness on the surface on the back side, so conveyance during printing with a grip roller type printer Can be improved. The unevenness on the surface of the matte non-porous film can be provided by a conventionally known method. For example, what was provided at the time of extending | stretching in a film manufacturing process may be sufficient, and what was provided by mechanical processing or chemical processing after film formation may be used.

  The matte non-porous film preferably contains a polypropylene resin as a main component. By using a polypropylene resin as a main component, the cost can be reduced compared to an expensive resin such as polyethylene terephthalate (PET). The matte non-porous film preferably has a thickness of 15 μm or more, preferably 15 μm or more and 25 μm. With such a thickness, it is possible to ensure transportability while reducing costs.

Back surface primer layer The back surface primer layer in the present invention is provided between the non-porous film and the back surface layer, adhesion between the non-porous film and the back surface layer, whiteness, cushioning property, concealing property, antistatic For the purpose of imparting properties and curling prevention properties. In this invention, a back surface primer layer contains a urethane resin and an isocyanate type hardening | curing agent. By using such a binder resin and a curing agent in combination, the adhesion between the non-porous film and the back surface layer can be improved. Moreover, in order to improve performances other than adhesiveness, you may add another additive. Other additives are as described in the primer layer. The coating amount of the back primer layer is preferably about 0.5 to 5 g / m ^{2 in} a dry state.

Back surface layer The back surface layer in the present invention is a layer provided on the back surface side in order to improve transportability during printing by a grip roller type printer. By providing the back layer, the writing property on the back side can be improved. In the present invention, a conventionally known back layer can be provided. Examples of the binder resin used for the back layer include polyvinyl butyral resins, methacrylate resins or corresponding acrylate resins, and vinyl resins such as vinyl chloride-vinyl acetate copolymers. The coating amount of the back layer is preferably about 0.5 to 5 g / m ^{2 in} a dry state.

Adhesive layer The adhesive layer in this invention is a layer for bonding a base material sheet and a porous film, or for bonding a base material sheet and a non-porous film. The adhesive layer can be appropriately selected according to a bonding method such as dry lamination, wet lamination, and a method of bonding by electron beam irradiation after bonding, and is not limited. Examples of the adhesive used in the adhesive layer include vinyl acetate resin, acrylic resin, vinyl acetate-acrylic copolymer resin, vinyl acetate-vinyl chloride copolymer resin, ethylene-vinyl acetate copolymer resin, polyamide resin, polyvinyl Examples include those containing acetal resin, polyester resin, polyurethane resin, and the like as components.

Glossiness of thermal transfer image-receiving sheet In the present invention, the glossiness on the back side of the thermal transfer image-receiving sheet is preferably 10% or less, more preferably 5% or less. With such a glossiness, the surface on the back side of the thermal transfer image-receiving sheet has irregularities with an appropriate roughness, so that the transportability can be further improved.

  In the present invention, the “glossiness” on the back side of the thermal transfer image-receiving sheet is 23 ° C. according to JIS Z 8741 using a gloss meter (manufactured by Nippon Denshoku Industries Co., Ltd., trade name: VG2000, measurement angle 45 °). The value measured in an environment with a humidity of 50 RH%.

Method for Producing Thermal Transfer Image-Receiving Sheet The thermal transfer image-receiving sheet of the present invention can be produced by laminating a porous layer and a dye-receiving layer on at least one surface of the substrate sheet by a known method. According to a preferred embodiment, the dye-receiving layer comprises a thermoplastic resin and other necessary additives such as mold release agents, plasticizers, fillers, cross-linking agents, curing agents, catalysts, heat release agents, UV absorbers. , Antioxidants, light stabilizers, etc., in the form of, for example, a gravure printing method, a screen printing method, and a reverse roll coating method using a gravure plate, which are formed by dissolving or dispersing an organic solvent or water. Can be formed by coating and drying. The coating amount of the thus formed are dye-receiving layer, usually, 0.5 to 50 g / ^{m 2} approximately in the dry state, preferably 2 to 10 g / ^{m 2.} Such a dye-receiving layer is preferably a continuous coating, but may be formed as a discontinuous coating. The back layer, primer layer, and the like are also applied by the same method as that for forming the dye receiving layer.

Thermal transfer ink sheet The thermal transfer ink sheet used together with the thermal transfer image-receiving sheet of the present invention is provided with a heat transferable color material layer on one side of the base sheet and a heat resistant slipping layer on the other side of the base sheet. It is preferable to have a layer structure. Hereinafter, each layer constituting the thermal transfer ink sheet will be described.

As the material of the base sheet constituting the thermal transfer ink sheet used in the present invention, a conventionally known material can be used, and even if it is other than that, it has a certain degree of heat resistance and strength. Can be used. For example, polyethylene terephthalate, polyester, polypropylene, polycarbonate, polyethylene, polystyrene, polyvinyl alcohol, polyvinyl chloride, polyvinylidene chloride, polyimide, nylon, cellulose acetate, ionomer and other resin films, condenser paper, paraffin paper, and other non-woven fabrics Etc. These may be used alone, or a laminate in which these are arbitrarily combined may be used. Among these, polyethylene terephthalate which is a versatile plastic that can be thinned and is inexpensive is preferable.

  The thickness of the base sheet can be appropriately selected according to the material so that the strength, heat resistance and the like are appropriate, but is usually preferably about 0.5 to 50 μm, more preferably 1 to 20 μm, and further Preferably it is 1-10 micrometers.

  The base sheet may be subjected to a surface treatment in order to improve adhesion with an adjacent layer. As the surface treatment, known resin surface modification techniques such as corona discharge treatment, flame treatment, ozone treatment, ultraviolet treatment, radiation treatment, surface roughening treatment, chemical treatment, plasma treatment, and grafting treatment are applied. can do. Only one type of the surface treatment may be applied, or two or more types may be applied.

  Furthermore, it is also possible to apply and form an adhesive layer on the base sheet as an adhesive treatment of the base sheet. An adhesion layer can be formed from the following organic materials and inorganic materials, for example. Examples of the organic material include polyester resins, polyacrylate resins, polyvinyl acetate resins, polyurethane resins, styrene acrylate resins, polyacrylamide resins, polyamide resins, polyether resins, polystyrene resins, Examples thereof include polyethylene resins, polypropylene resins, polyvinyl chloride resins, polyvinyl alcohol resins, polyvinyl pyrrolidone and vinyl resins such as modified products thereof, and polyvinyl acetal resins such as polyvinyl acetoacetal and polyvinyl butyral. Examples of the inorganic material include silica (colloidal silica), alumina or alumina hydrate (alumina sol, colloidal alumina, cationic aluminum oxide or hydrate, suspicion bakumaite, etc.), aluminum silicate, magnesium silicate, magnesium carbonate, oxidation Examples thereof include ultrafine particles of colloidal inorganic pigments such as magnesium and titanium oxide.

  Moreover, when manufacturing a plastic film by extending | stretching as said surface treatment, a primer liquid can be apply | coated to an unstretched film and it can also carry out by extending | stretching after that (primer process).

Thermal transferable color material layer The thermal transfer ink sheet used in the present invention is provided with a thermal transferable color material layer on one surface of a substrate sheet. When the thermal transfer ink sheet is a sublimation type thermal transfer ink sheet, a layer containing a sublimation dye is formed as the thermal transferable color material layer, and when the thermal transfer type thermal transfer ink sheet is a hot melt composition containing a colorant A layer containing a heat-meltable ink is formed. A layer region containing a sublimable dye and a layer region containing a heat-meltable ink composed of a heat-melting composition containing a colorant are provided in a surface sequence on a continuous base sheet. Also good.

  As the material of the heat transferable color material layer, conventionally known dyes can be used, but those having good characteristics as a printing material, for example, having a sufficient coloring density and changing color due to light, heat, temperature, etc. Those that do not are preferred. For example, as red dyes, MS Red G (manufactured by Mitsui Toatsu Chemical Co., Ltd.), Macrolex Red Violet R (manufactured by Bayer Co., Ltd.), Ceres Red 7B (manufactured by Bayer Co., Ltd.), Samaron Red F3BS (Mitsubishi Chemical ( As a yellow dye, Holon Brilliant Yellow 6GL (manufactured by Clariant Co., Ltd.), PTY-52 (manufactured by Mitsubishi Kasei Co., Ltd.), Macrolex Yellow 6G (manufactured by Bayer Co., Ltd.), etc. Examples of blue dyes include Kayaset Blue 714 (manufactured by Nippon Kayaku Co., Ltd.), Waxoline Blue AP-FW (manufactured by ICI), Holon Brilliant Blue SR (manufactured by Sand Co., Ltd.), MS Blue 100 (Mitsui Toatsu Chemical Co., Ltd.).

  Examples of the binder resin for supporting the dye include cellulose resins such as ethyl cellulose resin, hydroxyethyl cellulose resin, ethyl hydroxy cellulose resin, methyl cellulose resin, and cellulose acetate resin, polyvinyl alcohol resin, polyvinyl acetate resin, and polyvinyl butyral resin. And vinyl resins such as polyvinyl acetal resin and polyvinyl pyrrolidone, acrylic resins such as poly (meth) acrylate and poly (meth) acrylamide, polyurethane resins, polyamide resins, and polyester resins. Among these, cellulose-based, vinyl-based, acrylic-based, polyurethane-based, and polyester-based resins are preferable from the viewpoints of heat resistance, dye transferability, and the like.

  Examples of the method for forming the heat transferable color material layer include the following methods. For the heat-transferable colorant layer obtained by adding additives such as a release agent to the above dyes and binder resin, if necessary, dissolved in an appropriate organic solvent such as toluene or methyl ethyl ketone, or dispersed in water. A coating solution (solution or dispersion) is applied to one surface of a base sheet by, for example, a gravure printing method, a reverse roll coating method using a gravure plate, a roll coater, a bar coater, etc. It can be formed by drying. The heat transferable color material layer has a thickness of about 0.2 to 5.0 μm, and the content of the sublimable dye in the heat transferable color material layer is 5 to 90% by mass, preferably 5 to 70% by mass. It is preferable that

Protective layer The thermal transfer ink sheet used in the present invention may be provided with a protective layer in the surface order on the same side as the thermal transferable color material layer. After the color material is transferred to the thermal transfer image-receiving sheet, the protective layer is transferred to cover the image, whereby the image can be protected from light, gas, liquid, abrasion and the like. Other layers such as an adhesive layer, a release layer, a release layer, or an undercoat layer may be provided as a protective layer.

Heat-resistant slip layer The heat-resistant slip layer is mainly composed of a heat-resistant resin. The heat resistant resin is not particularly limited. For example, polyvinyl butyral resin, polyvinyl acetoacetal resin, polyester resin, vinyl chloride-vinyl acetate copolymer resin, polyether resin, polybutadiene resin, styrene-butadiene copolymer resin, Acrylic polyol, polyurethane acrylate, polyester acrylate, polyether acrylate, epoxy acrylate, urethane or epoxy prepolymer, nitrocellulose resin, cellulose nitrate resin, cellulose acetate propionate resin, cellulose acetate butyrate resin, cellulose acetate-hydrodiene Phthalate resin, cellulose acetate resin, aromatic polyamide resin, polyimide resin, polyamideimide resin, polycarbonate resin, Fine chlorinated polyolefin resins.

  The heat resistant slipping layer may be formed by blending additives such as a slipperiness imparting agent, a crosslinking agent, a release agent, an organic powder, and an inorganic powder in addition to the above heat resistant resin.

In general, the heat-resistant slipping layer is formed by adding the above-mentioned heat-resistant resin, and the above-described slipperiness-imparting agent and additives that are optionally added to the solvent, and dissolving or dispersing each component to thereby apply the heat-resistant slipping layer coating solution. Then, the heat resistant slipping layer coating solution can be coated on a substrate and dried.
As the solvent in the heat resistant slipping layer coating solution, the same solvent as that in the dye ink can be used.

Examples of the coating method of the heat resistant slipping layer coating liquid include wire bar coating, gravure printing, screen printing, reverse roll coating using a gravure plate, and gravure coating is particularly preferable. Heat-resistant slip layer coating solution, dry coating amount is preferably 0.1 to 3 g / ^{m 2,} more preferably may be applied so as to be 1.5 g / ^{m 2} or less.

Image Forming Method In the image forming method using the thermal transfer image receiving sheet of the present invention, the thermal transfer image receiving sheet and the thermal transfer ink sheet containing a heat diffusible dye are overlaid and heated in accordance with a recording signal, thereby transferring the thermal transfer image. An image can be formed by transferring the thermal diffusible dye contained in the ink sheet to the thermal transfer image-receiving sheet. In the present invention, it is preferable to form an image by high-speed printing. Here, the high-speed printing is 0.5 to 3.0 msec / line.

  As a thermal transfer recording apparatus that can be used in such an image forming method, a known apparatus can be used and is not particularly limited. In the present invention, a commercially available thermal transfer recording apparatus can be used.

  EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples and comparative examples, but the present invention is not construed as being limited to the contents of the following examples. Hereinafter, unless otherwise specified, parts or% is based on mass.

Example 1
Coated paper (thickness 130 μm, manufactured by Mitsubishi Paper Industries Co., Ltd., trade name: Pearl Coat 157) was used as the base sheet. In addition, a porous polypropylene film (thickness 35 μm, manufactured by Mitsui Chemicals, Inc., trade name: Econage SP-D) was prepared as a porous film forming the porous layer. Next, on one side (front side) of the coated paper, using an adhesive having the following composition, it is coated with a gravure coater, and an adhesive layer is formed so that the coating amount after drying is 5 g / m ^2. Then, the porous polypropylene film was bonded and laminated by a dry lamination method.
Composition of adhesive layer coating solution / Hydroxyl group-containing oligomer (Mitsui Chemical Polyurethane Co., Ltd., trade name: Takelac A-969V) 45 parts by mass Urethane oligomer having isocyanate group (Mitsui Chemical Polyurethane Co., Ltd., product) Name: Takenate A-51) 15 parts by mass / ethyl acetate 45 parts by mass

Subsequently, on the porous polypropylene film, a primer layer coating solution having the following composition was applied with a gravure coater so as to be ² g / m ² after drying, and dried at 110 ° C. for 1 minute. A dye receiving layer coating solution having the following composition was dried and coated with a gravure coater to give 4 g / m ² and dried at 110 ° C. for 1 minute to form a primer layer and a dye receiving layer.

Composition of primer layer coating solution / polyester resin (Nippon Synthetic Chemical Co., Ltd., trade name: WR-905) 13.1 parts by mass / titanium oxide (manufactured by Tochem Products Co., Ltd., trade name: TCA-888) ) 26.2 parts by mass. Optical brightener (benzimidazole derivative, manufactured by Ciba Specialty Chemicals, Inc., trade name: Ubitex BAC) 0.39 parts by mass. Water / isopropyl alcohol [IPA] (mass ratio 2) / 1) 60 parts by mass

Composition of coating solution for dye-receiving layer : Vinyl chloride-vinyl acetate copolymer (manufactured by Nissin Chemical Industry Co., Ltd., trade name: Solvein C)
60 parts by mass / epoxy-modified silicone (manufactured by Shin-Etsu Chemical Co., Ltd., trade name: X-22-3000T)
1.2 parts by mass / methylstil modified silicone (manufactured by Shin-Etsu Chemical Co., Ltd., trade name: 24-510)
0.6 parts by mass / methyl ethyl ketone / toluene (mass ratio 1/1) 5 parts by mass

Further, a mat-like non-porous polypropylene film (thickness 20 μm, manufactured by Tosero Co., Ltd., trade name: OP mat-1) was prepared as a mat-like non-porous film forming the non-porous layer. Next, the other side (back side) of the coated paper is coated with a gravure coater using an adhesive having the same composition as described above, and bonded so that the coating amount after drying is 5 g / m ^2. A layer was formed, and a mat-like non-porous polypropylene film was bonded and laminated by a dry laminating method.

Subsequently, on the matte-like non-porous polypropylene film, a back surface primer layer coating solution having the following composition was coated with a gravure coater so as to be 0.2 g / m ² after drying, and then at 110 ° C. for 1 minute. After drying, a back layer coating solution having the following composition is dried on it and coated with a gravure coater so as to be 0.4 g / m ^2, and dried at 110 ° C. for 1 minute. The layer was formed, and the thermal transfer image receiving sheet of Example 1 was obtained. This thermal transfer image-receiving sheet had a layer structure as shown in FIG.

Composition of the backside primer layer coating solution / urethane resin (made by Showa Ink Industry Co., Ltd., trade name: OPT primer) 100 parts by mass / isocyanate-based curing agent (made by Showa Ink Industries, Ltd., trade name: OPT curing agent) ) 5 parts by mass

Composition of coating liquid for back surface layer / vinyl butyral resin (manufactured by Denki Kagaku Kogyo Co., Ltd., trade name: Denkabutyral 3000-1) 10 parts by mass / silicon dioxide (manufactured by Fuji Silysia Chemical Co., Ltd., trade name: Silysia 380) 0.75 parts by mass / titanium chelate (Denka Polymer Co., Ltd., trade name: AT chelating agent)
0.117 parts by mass

Example 2
Thermal transfer of Comparative Example 1 in the same manner as in Example 1 except that a matte nonporous polypropylene film (thickness 20 μm, manufactured by Toyobo Co., Ltd., trade name: P4166) was used as the matte nonporous film. An image receiving sheet was prepared.

Example 3
Comparative Example as in Example 1 except that a matte non-porous polypropylene film (thickness 18 μm, manufactured by Wako Industry Co., Ltd., trade name: HO402) was used as the matte non-porous film. 1 thermal transfer image-receiving sheet was prepared.

Comparative Example 1
The thermal transfer image-receiving sheet of Comparative Example 1 was prepared in the same manner as in Example 1 except that a transparent non-porous polypropylene film (thickness 30 μm, manufactured by Toyobo Co., Ltd., trade name: P2261) was used as the non-porous film. Produced.

Comparative Example 2
The thermal transfer image-receiving sheet of Comparative Example 2 was prepared in the same manner as in Example 1 except that a transparent non-porous polypropylene film (thickness 20 μm, manufactured by Toyobo Co., Ltd., trade name: P2261) was used as the non-porous film. Produced.

Comparative Example 3
A thermal transfer image receiving sheet of Comparative Example 3 was produced in the same manner as in Example 1 except that the back primer layer and the back layer were not provided.

Comparative Example 4
A thermal transfer image-receiving sheet of Comparative Example 4 was produced in the same manner as Comparative Example 1 except that the back primer layer and the back layer were not provided.

Glossiness of thermal transfer image-receiving sheet Glossiness on the back layer side of the thermal transfer image-receiving sheet produced in the above examples and comparative examples was measured by a gloss meter (trade name: VG2000, manufactured by Nippon Denshoku Industries Co., Ltd., measurement angle: 45 degrees ) In an environment of 23 ° C. and humidity of 50 RH%.

Evaluation of Thermal Transfer Image Receiving Sheet The thermal transfer image receiving sheets prepared in the above examples and comparative examples were evaluated for (1) transportability and (2) writability.

(1) Conveyability A 0.5 mm wide linear image (black) was printed on a thermal transfer image receiving sheet using a sublimation thermal transfer printer (manufactured by ALTECH ADS Co., Ltd., model: MEGAIXEL III). The transportability during printing was evaluated according to the following criteria.
-Evaluation standard ( circle): The processus | protrusion installed in the grip roll stuck in the same position in the process of reciprocating conveyance of a thermal transfer image receiving sheet, and was able to output the favorable printed matter as a result.
Δ: Some protrusions installed on the grip roll did not pierce at the same position due to the reciprocal conveyance of the thermal transfer image-receiving sheet, but no defects in appearance were found even when the printed matter was visually observed.
X: Deviation occurred at the position where the protrusion installed on the grip roll was stabbed during the reciprocating conveyance of the thermal transfer image receiving sheet, and color deviation occurred on the printed matter.

(2) Writability Writing with an oil-based ballpoint pen was performed on the back surface of the thermal transfer image-receiving sheet, and it was visually confirmed whether the written characters were rubbed by rubbing with a finger after 1 minute.
・Evaluation criteria ○: Characters did not fade when rubbed with fingers.
×: Characters were faint when rubbed with a finger.

Table 2 shows the results of the above evaluations. It can be seen that the thermal transfer image-receiving sheets of Examples 1 to 3 satisfying the composition of the present invention are superior in transportability and writing property as compared with the thermal transfer image-receiving sheets of Comparative Examples 1 to 4. The thermal transfer image-receiving sheet satisfying the composition of the present invention can achieve high image quality with no image displacement due to improved transportability. Furthermore, the thermal transfer image-receiving sheet satisfying the composition of the present invention has good writing properties on the back surface.

DESCRIPTION OF SYMBOLS 10 Thermal transfer image receiving sheet 11 Base material sheet 12 Adhesive layer 13 Porous layer 14 Primer layer 15 Dye-receiving layer 16 Adhesive layer 17 Non-porous layer 18 Back surface primer layer 19 Back surface layer

Claims (5)

A base sheet;
On one side of the base sheet, a porous layer, a dye receiving layer,
On the other surface of the base sheet, a non-porous layer made of a mat-like non-porous film, a back primer layer, and a back layer,
Wherein between the non-porous layer and the base sheet, and further comprising an adhesive layer containing an oligomer of the hydroxyl group-containing, heat transfer image-receiving sheet.   The thermal transfer image receiving sheet according to claim 1, wherein the glossiness of the back surface layer side of the thermal transfer image receiving sheet is 10% or less.   The thermal transfer image-receiving sheet according to claim 1 or 2, wherein the matte non-porous film has a thickness of 15 µm or more and less than 25 µm.   The thermal transfer image-receiving sheet according to any one of claims 1 to 3, wherein the matte non-porous film is a polypropylene resin film.   The thermal transfer image-receiving sheet according to any one of claims 1 to 4, wherein the back primer layer comprises a urethane resin and an isocyanate curing agent.

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