JP2011073355A - Thermal transfer image receiving sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a thermal transfer image receiving sheet which can exhibit excellent effects in adhesion, image density, moisture resistance and heat resistance, a coating aptitude, and halftone mold releasability. <P>SOLUTION: This thermal transfer image receiving sheet includes: a base material; a porous layer; a primer layer; and a receiving layer composed of at least two layers on the base material where the receiving layer includes: a receiving layer A contacting with the primer layer; and a receiving layer B in a position most apart from the base material, the receiving layer A includes a resin, and a hydrophilic binder, and the receiving layer B includes a resin and a release agent. By using the thermal transfer image receiving sheet fulfilling the composition, excellent effects in the adhesion, image density, moisture resistance and heat resistance, coating aptitude, and halftone mold releasability can be exhibited. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a thermal transfer image-receiving sheet having a substrate, a porous layer, a primer layer, and a receiving layer comprising at least two layers on the substrate.

  Conventionally, various printing methods are known. Among them, the thermal diffusion type transfer method (sublimation type thermal transfer method) uses a sublimation dye as a color material, so that density gradation can be freely adjusted, and intermediate colors and gradations can be adjusted. It has excellent tone reproducibility and can form high-quality images comparable to silver halide photographs.

  This thermal diffusion transfer system is a method in which a thermal transfer ink sheet containing a dye (sublimation dye) and a thermal transfer image receiving sheet are superposed, and then the ink sheet is heated by a thermal head whose heat generation is controlled by an electrical signal. The dye in the ink sheet is transferred to the image receiving sheet to record image information. As such thermal diffusion transfer systems become widespread, the printing speed has been increased, and sufficient color density can be obtained even if the conventional thermal energy is printed using the conventional thermal transfer ink sheet and thermal transfer image receiving sheet. There are problems such as inability to obtain.

  Furthermore, there are various other problems in the thermal diffusion transfer system. For example, due to insufficient releasability of the image receiving sheet, the ink sheet sticks to the receiving layer surface of the image receiving sheet at the time of printing, and when the ink sheet is peeled off from the image receiving layer after printing, generation of peeling sound, Problems such as poor running and occurrence of peeling lines on the image have occurred.

  In general, in order to improve releasability, there are methods such as increasing the glass transition temperature (Tg) of the resin, but there is also a problem that the concentration and / or light resistance is lowered. Therefore, it has been proposed to use a thermal transfer image-receiving sheet having a receiving layer containing at least one paraffin wax dispersion and a vinyl chloride latex, but the image density of the printed material has not been sufficiently evaluated and is practically used. It is difficult to say that a possible image density is obtained. Further, there is no mention of moisture resistance and heat resistance of the printed material, and no method for improving moisture resistance and heat resistance has been proposed (for example, see Patent Document 1). Further, problems such as peeling noise when the ink sheet is peeled from the image receiving layer after printing can be improved by adding a release agent such as silicone oil to the receiving layer. However, with the increase in printing speed, it is necessary to add a large amount of release agent to solve these problems, and a new problem arises that the receiving layer is easily peeled off from the adjacent layer, that is, the adhesiveness is insufficient. Yes.

  Therefore, there is still a strong demand for the development of a thermal transfer image-receiving sheet that has improved various properties such as adhesiveness, image density, moisture / heat resistance, coating suitability, and halftone releasability.

JP 2009-83159 A

  The present invention has been made in view of the above-mentioned background art, and its purpose is to improve various performances such as adhesiveness, image density, moisture resistance / heat resistance, coating suitability, and halftone releasability, It is to provide a thermal transfer image receiving sheet.

  As a result of intensive studies to solve the above problems, the present inventors have adjusted the various components contained in the receiving layer to a specific type and a specific concentration range in the receiving layer comprising at least two layers of the thermal transfer image receiving sheet. As a result, the inventors have found that the above problems can be solved, and have completed the present invention.

That is, the present invention
A thermal transfer image-receiving sheet having a base material, a porous layer, a primer layer, and a receiving layer composed of at least two layers on the base material,
The receiving layer has a receiving layer A in contact with the primer layer, and a receiving layer B located farthest from the substrate;
The receiving layer A contains a resin and a hydrophilic binder, and the content of the hydrophilic binder in the receiving layer A is 8 to 90% by mass with respect to the total solid content mass of the resin and the hydrophilic binder,
Provided is a thermal transfer image receiving sheet in which the receiving layer B contains a resin and a release agent, and the content of the release agent in the receiving layer B is 8 to 13% by mass with respect to the total solid content mass of the resin. To do.

  According to the thermal transfer image-receiving sheet of the present invention, excellent effects can be exhibited in various performances such as adhesion, image density, moisture resistance / heat resistance, coating suitability, and halftone releasability.

Thermal transfer image-receiving sheet The thermal transfer image-receiving sheet of the present invention comprises a base material, a porous layer, a primer layer, and a receiving layer in this order on the base material. In a preferred embodiment, the thermal transfer image receiving sheet may further have other layers such as an intermediate layer and a release layer.

Substrate In the present invention, the substrate has a role of holding the image-receiving layer, and heat is applied during thermal transfer. Therefore, the substrate may be a material having mechanical strength that does not hinder handling even in an overheated state. preferable.

  Examples of the base material include condenser paper, glassine paper, sulfuric acid paper, high-size paper, synthetic paper (polyolefin-based, polystyrene-based), high-quality paper, art paper, coated paper, and resin-coated paper. , Cast coated paper, wallpaper, backing paper, synthetic resin or emulsion impregnated paper, synthetic rubber latex impregnated paper, synthetic resin internal paper, paperboard, cellulose fiber paper, or polyester, polyacrylate, polycarbonate, polyurethane, polyimide, polyether Imide, cellulose derivative, polyethylene, ethylene-vinyl acetate copolymer, polypropylene, polystyrene, acrylic, polyvinyl chloride, polyvinylidene chloride, polyvinyl alcohol, polyvinyl butyral, nylon, polyether ether ketone, polysulfone, Examples include films of polyethersulfone, tetrafluoroethylene, perfluoroalkyl vinyl ether, polyvinyl fluoride, tetrafluoroethylene / ethylene, tetrafluoroethylene / hexafluoropropylene, polychlorotrifluoroethylene, and polyvinylidene fluoride. A white opaque film formed by adding a white pigment or a filler to these synthetic resins can also be used, and is not particularly limited. Moreover, the laminated body by the arbitrary combinations of the said base material can also be used. Examples of typical laminates include cellulose fiber paper and synthetic paper, or synthetic paper of cellulose synthetic paper and a plastic film. In this invention, a commercially available base material can also be used, for example, RC paper (Mitsubishi Paper Co., Ltd. make, brand name: STF-150) etc. are preferable. The base material thickness can be appropriately changed according to the strength and heat resistance required for the thermal transfer image-receiving sheet and the material of the material employed as the base material. Specifically, the base material thickness is 50 μm. It is preferable to be within a range of ˜1000 μm, and it is more preferable to be within a range of 100 μm to 300 μm.

Porous layer The porous layer in the present invention has heat insulation properties that can prevent heat applied during image formation by thermal transfer from being lost due to heat transfer to a substrate or the like. The porous layer contains hollow particles, and may further contain a hydrophilic binder and other additives. According to a preferred embodiment, the porous layer may be composed of two or more layers. The porous layer has cushioning properties by including hollow particles. Here, the degree of cushioning property of the porous layer can be appropriately adjusted according to the use of the thermal transfer image receiving sheet. The degree of cushioning property of the porous layer can also be adjusted to an arbitrary range by changing the thickness of the porous layer, for example. The thickness of the porous layer is not particularly limited as long as the heat insulating property, cushioning property and the like can be adjusted to a desired level, but it is preferably within a range of 10 μm to 100 μm, and preferably 10 μm to 50 μm. More preferably within the range. The density of the porous layer is preferably in the range of, for example, 0.1 g / cm3 to 0.8 g / cm3, and more preferably in the range of 0.2 g / cm3 to 0.7 g / cm3.

Hollow particles The average particle size of the hollow particles used in the present invention is preferably 0.1 to 10 µm, more preferably 0.3 to 5 µm. If the average particle diameter of the hollow particles is in the above range, heat insulating properties and cushioning properties can be imparted to the porous layer. This is because if the average particle size is too small, the amount of hollow particles used increases and the cost increases, and if the average particle size is too large, it becomes difficult to form a smooth porous layer. The average hollowness of the hollow particles is preferably 20% or more, more preferably 30 to 80%. If the average hollowness of the hollow particles is in the above range, heat insulating properties and cushioning properties can be imparted to the porous layer. Furthermore, the organic hollow particle comprised from resin etc. may be sufficient, and the inorganic hollow particle comprised from glass etc. may be sufficient. The hollow particles may be cross-linked hollow particles. In the present invention, commercially available hollow particles can also be used. For example, AF-1055, HP-91, Ropeke SE (manufactured by Rohm and Haas), MH-5055 (Nippon Zeon) and the like are preferable.

  The “average particle size” is obtained as follows. A water dispersion is prepared by dispersing hollow particles in water, and the water dispersion of the hollow particles is dried to form a dry body, and then dried with a transmission electron microscope (manufactured by Hitachi High-Technologies Corporation). The particles (100 particles) forming the hollow particles in the body were observed, the diameter (outer diameter) on the outer surface side of each particle was measured, and these values were averaged to obtain the average particle diameter. The “average hollow ratio” can be determined as follows. A water dispersion is prepared by dispersing hollow particles in water, and the water dispersion of the hollow particles is dried to form a dry body, and then dried with a transmission electron microscope (manufactured by Hitachi High-Technologies Corporation). Particles (100 particles) forming hollow particles in the body were observed, and the diameter (inner diameter) on the inner surface side of each particle was measured, and these values were averaged to obtain the average particle inner diameter. Then, while determining the volume of the hollow part from the average particle inner diameter, the value was divided by the apparent volume of the particle from the average particle diameter and multiplied by 100 to calculate the average hollow ratio.

Primer layer The primer layer in the present invention has a role of favorably adhering the porous layer and the receiving layer, and improves the image storability by preventing migration of the dye to the porous layer side in a high temperature and high humidity environment. It has a function to make it. In a preferred embodiment, the primer layer contains hollow particles, a resin, and a hydrophilic binder, and the resin preferably contains an acrylic resin. Although it does not specifically limit as thickness of a primer layer, For example, it is preferable that they are 1 micrometer-40 micrometers, 1 micrometer-20 micrometers are more preferable, and 1 micrometer-10 micrometers are more preferable.

Acrylic resin In the present invention, the acrylic resin is a polymer of acrylic acid or methacrylic acid monomer or derivative thereof, a polymer of acrylic acid ester or methacrylic acid ester monomer or derivative thereof, acrylic acid or methacrylic acid monomer. And other monomers and copolymers thereof, and copolymers of acrylic acid or methacrylic acid monomers with other monomers or derivatives thereof.

  According to a preferred embodiment of the present invention, the acrylic resin is preferably a copolymer of an acrylic ester or methacrylic ester monomer and another monomer or a derivative thereof. Examples of the acrylic ester or methacrylic ester monomer include alkyl acrylate and alkyl methacrylate, preferably methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, butyl acrylate, butyl methacrylate, lauryl acrylate, lauryl methacrylate, and the like. Can be mentioned. Examples of other monomers include aromatic hydrocarbons, aryl group-containing compounds, amide group-containing compounds, and vinyl chloride, preferably styrene, benzylstyrene, phenoxyethyl methacrylate, acrylamide, and methacrylamide. it can. In the present invention, a copolymer of an alkyl acrylate or an alkyl methacrylate and at least one other monomer selected from the group consisting of an aromatic hydrocarbon, an aryl group-containing compound, and an amide group-containing compound, or a derivative thereof. It is particularly preferable to use it. By copolymerizing the monomers as described above, the concentration and releasability can be improved. Two or more acrylic resins may be mixed and used.

Receiving layer The receiving layer in the present invention receives the sublimation dye transferred from the thermal transfer ink sheet during image formation by thermal transfer, and holds the received sublimation dye in the receiving layer, whereby an image is formed on the surface of the receiving layer. Can be formed and maintained. Resins used for forming the receiving layer include acrylic resins, vinyl chloride resins, polyolefin resins such as polyethylene and polypropylene, polyvinyl chloride, vinyl chloride / vinyl acetate copolymers, halogenated polymers such as polyvinylidene chloride, Vinyl polymers such as polyvinyl acetate and polyacrylate, polyester resins such as polyethylene terephthalate and polybutylene terephthalate, polystyrene resins, polyamide resins, and copolymers of olefins such as ethylene and propylene and other vinyl monomers , Ionomers, cellulose resins such as cellulose diacetate, polycarbonates, and the like. Particularly preferred are acrylic resins and / or vinyl chloride resins. In addition, a receiving layer consists of at least 2 layers, and has the receiving layer A which touches a primer layer, and the receiving layer B in the position most distant from a base material. By providing two or more receiving layers made of the resin as described above, adhesiveness, image density, and releasability can be improved. In particular, the receiving layer A is interlayer adhesive, and the receiving layer B is image density, releasability. , Each can improve different functions.

Receptive layer A
In the present invention, the receiving layer A is a layer in contact with the primer layer and contains a resin and a hydrophilic binder. By containing the hydrophilic binder in the receiving layer A, the primer layer and the adhesiveness can be improved. The content of the hydrophilic binder in the receiving layer A is 8 to 90% by mass, preferably 8 to 50% by mass, more preferably 10 to 30%, based on the total solid content mass of the resin and the hydrophilic binder. % By mass. If the content of the hydrophilic binder in the receiving layer A is in the above range, it adheres well to the primer layer, prevents the dye from moving to the porous layer side in a high temperature and high humidity environment, and is suitable for coating. Can be improved. The thickness of the receiving layer A may be appropriately selected as necessary, but the thickness is generally 1 to 50 μm, preferably in the range of 1 μm to 10 μm, preferably in the range of 2 μm to 10 μm. It is more preferable that

Receptive layer B
In the present invention, the receiving layer B is the farthest away from the substrate and is formed on the receiving layer A. The receiving layer B contains a resin and a release agent. The content of the release agent in the receiving layer B is 8 to 13% by mass, preferably 9 to 12% by mass, based on the total solid mass of the resin. When the content of the release agent in the receiving layer B is in the above range, problems such as fusion and adhesion between the thermal transfer ink sheet and the receiving layer of the thermal transfer image receiving sheet can be improved. The thickness is generally 1 to 50 μm, preferably in the range of 1 μm to 10 μm, and more preferably in the range of 2 μm to 10 μm. The receiving layer B may contain a hydrophilic binder, but is preferably less than the content of the hydrophilic binder in the receiving layer A, the content is more preferably less than 5%, and more preferably less than 2%. Further preferred. If the content is in the above range, it is possible to improve the influence on the performance such as the image density and the fusion and adhesion between the thermal transfer ink sheet and the receiving layer of the thermal transfer image receiving sheet.

Hydrophilic binder According to a preferred embodiment of the present invention, the hydrophilic binder contained in the porous layer, the primer layer, and the receiving layer includes gelatin and derivatives thereof, polyvinyl alcohol, polyethylene oxide, polyvinyl pyrrolidone, pullulan. Carboxymethylcellulose, hydroxyethylcellulose, dextran, dextrin, polyacrylic acid and its salts, agar, κ-carrageenan, λ-carrageenan, ι-carrageenan, casein, xanthene gum, locust bean gum, alginic acid, and gum arabic. In particular, gelatin is preferred. By using such a hydrophilic binder, it is possible to improve interlayer adhesion with a layer in contact with the receiving layer. In particular, when each layer is formed by an aqueous coating method and a simultaneous multilayer coating method, the viscosity of each coating solution can be adjusted to a desired range by using gelatin, and a desired film thickness can be obtained. In the present invention, commercially available gelatin can also be used, and for example, RR, R, CLV (manufactured by Nitta Gelatin Co., Ltd.) and the like are preferable.

Release Agent Examples of the release agent contained in the receiving layer B in the present invention include silicone oil (including reaction-curable silicone), phosphate ester plasticizers, and fluorine compounds. preferable. Various silicones such as dimethyl silicone can be used as the silicone oil. Specifically, amino-modified silicone, epoxy-modified silicone, alcohol-modified silicone, vinyl-modified silicone, urethane-modified silicone, polyester-modified silicone, polyether-modified silicone, polyester-modified silicone oil, acrylic-modified silicone, amide-modified silicone, etc. These may be mixed or polymerized using various reactions. Two or more release agents may be mixed and used. By using such a release agent, problems such as fusion between the thermal transfer ink sheet and the receiving layer of the thermal transfer image receiving sheet and a decrease in printing sensitivity during printing can be improved. In the present invention, it is particularly preferable to use a polyether-modified silicone type release agent. Two or more polyether-modified silicone mold release agents may be used, or other mold release agents may be used in combination. In the present invention, commercially available release agents may be used, and for example, KF615A and KF352A (manufactured by Shin-Etsu Chemical Co., Ltd.), FZ-2101 (manufactured by Toray Dow Corning Co., Ltd.) and the like are preferable.

Release layer In the present invention, the release agent may not be added to the receiving layer, but may be provided as a separate release layer on the receiving layer.

Intermediate Layer In the present invention, at least one intermediate layer may be provided between the porous layer and the primer layer or between the primer layer and the receiving layer. By providing an intermediate layer, functions such as solvent resistance, dye diffusion barrier during image storage under high temperature / high humidity, interlayer adhesion, white color imparting, glare / unevenness of the substrate, and antistatic functions are added. Can do. As a method for forming the intermediate layer, known means can be used. For example, an optical brightener, inorganic fine particles, hollow fine particles, and an organic conductive material such as a conductive filler or polyaniline sulfonic acid are added to the intermediate layer. The method of doing is mentioned.

Manufacturing Method of Thermal Transfer Image Receiving Sheet A known manufacturing method can be used for manufacturing the thermal transfer image receiving sheet of the present invention. For the application of each layer of the thermal transfer image-receiving sheet, a known method such as roll coating, bar coating, gravure coating, gravure reverse coating, die coating, slide coating, curtain coating, etc. can be used. A method in which these layers can be applied simultaneously is preferred. In the present invention, it is particularly preferable to form all the layers constituting the receiving layer from the porous layer by an aqueous coating method and a simultaneous multilayer coating method. By such a manufacturing method, effects such as improvement in interlayer adhesion of each layer of the thermal transfer image-receiving sheet and cost improvement can be obtained.

Thermal transfer ink sheet The thermal transfer ink sheet used with the thermal transfer image-receiving sheet of the present invention has an ink layer containing a heat-diffusible dye on a substrate. Any known thermal transfer ink sheet may be used as long as it is such, and is not particularly limited.

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.

  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, and examples include a sublimation thermal transfer printer (manufactured by ALTECH ADS, model: MEGAPIXEL III).

  EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples and comparative examples. However, the present invention is not limited to the following examples. In addition, the weight part of description was described by solid content, and it diluted with the pure water as needed.

Sample preparation (preparation of styrene-acrylic copolymer)
A styrene-acrylic copolymer used as an acrylic resin was prepared by the following method. First, in a 500 mL (liter) Erlenmeyer flask, 136 g of styrene, 22 g of methyl acrylate, 34 g of lauryl acrylate, 2 g of acrylamide, and 2 g of acrylic acid were used as a copolymer-forming monomer, and Aqualon HS-10 (Daiichi Kogyo Seiyaku Co., Ltd.) as an emulsifier. )) 1.9 g was added and stirred and mixed to obtain monomer A. Next, 200 g of distilled water was put into a 1 L three-necked flask and heated to 80 ° C., and about 20% of the total amount of monomer A was added and stirred for 10 minutes. Subsequently, 0.4 g of ammonium persulfate dissolved in 20 g of pure water was added and stirred for 10 minutes, and then about 80% of the remaining monomer A was dropped in a dropping funnel over 3 hours, followed by further stirring for 15 hours. Then, it cooled to room temperature and filtered using # 150 mesh (Nippon Specialty Textile Co., Ltd., brand name: TNO150S), and obtained the emulsion. To this, an aqueous ammonia solution of magnesium hydroxide (solid content 20%) was added so as to be equivalent to the acrylic acid in the emulsion, whereby an emulsion 1 was obtained.

Example 1
Preparation of thermal transfer image-receiving sheet 1 RC paper (Made by Mitsubishi Paper Industries Co., Ltd., trade name: STF-150) was used, and porous layer forming coating liquids 1 and 2 having the following composition were used for primer layer formation. The coating liquid 1 and the receiving layer forming coating liquids A1 and B1 are heated to 40 ° C., respectively, and the thickness when dried is 3.3 μm, 3.8 μm, 3.6 μm, 1. After coating at 5 μm and 3.0 μm, cooling at 5 ° C. for 30 seconds, and drying at 50 ° C. for 2 minutes, thermal transfer image-receiving sheet 1 (layer structure: substrate / porous layer 1 / porous layer) 2 / primer layer / receptive layer A / receptive layer B).

Composition of coating liquid 1 for forming a porous layer: SE (hollow particles, manufactured by Rohm and Haas, average particle size 0.5 μm) 60 parts by weight RR (gelatin, manufactured by Nitta Gelatin Co., Ltd.) 20 parts by weight DM820 (MBR, manufactured by DIC Corporation) 20 parts by weight
Composition of porous layer forming coating solution 2 SE (hollow particles, manufactured by Rohm and Haas, average particle size 0.5 μm) 70 parts by weight RR (gelatin, manufactured by Nitta Gelatin Co., Ltd.) 25 parts by weight AP40 (aqueous polyurethane, manufactured by DIC Corporation) 5 parts by weight
Composition of primer layer forming coating solution SE (hollow particles, manufactured by Rohm and Haas, average particle size 0.5 μm) 70 parts by weight RR (gelatin, manufactured by Nitta Gelatin Co., Ltd.) 15 parts by weight NKJ300 ( Methacrylic acid ester / acrylic copolymer (manufactured by Shin-Nakamura Chemical Co., Ltd.)
15 parts by weight
Receiving layer forming coating liquid A1
・ VB900 (vinyl chloride emulsion, manufactured by Nissin Chemical Industry Co., Ltd.) 90 parts by weight ・ RR (gelatin, manufactured by Nitta Gelatin Co., Ltd.) 10 parts by weight
Receiving layer forming coating solution B1
・ VB900 (vinyl chloride emulsion, manufactured by Nissin Chemical Industry Co., Ltd.) 100 parts by weight ・ KF615A (silicone mold release agent, manufactured by Shin-Etsu Chemical Co., Ltd.) 9 parts by weight Sodium dioctyl sulfosuccinate is added to this solution to 0 2 parts by weight were added.

Example 2
Preparation of thermal transfer image-receiving sheet 2 A thermal transfer image-receiving sheet 2 was prepared in the same manner as in Example 1 except that the composition of the receiving layer-forming coating solution A was as follows.
Receiving layer forming coating liquid A2
・ VB900 (vinyl chloride emulsion, manufactured by Nissin Chemical Industry Co., Ltd.) 80 parts by weight ・ RR (gelatin, manufactured by Nitta Gelatin Co., Ltd.) 20 parts by weight

Example 3
Preparation of thermal transfer image-receiving sheet 3 A thermal transfer image-receiving sheet 3 was prepared in the same manner as in Example 1 except that the composition of the receiving layer-forming coating solution A was as follows.
Receiving layer forming coating liquid A3
・ VB900 (vinyl chloride emulsion, manufactured by Nissin Chemical Industry Co., Ltd.) 70 parts by weight ・ RR (gelatin, manufactured by Nitta Gelatin Co., Ltd.) 30 parts by weight

Example 4
Production of thermal transfer image-receiving sheet 4 A thermal transfer image-receiving sheet 4 was produced in the same manner as in Example 1 except that the composition of the receiving layer-forming coating solution A was as follows.
Receiving layer forming coating liquid A4
・ VB900 (vinyl chloride emulsion, manufactured by Nissin Chemical Industry Co., Ltd.) 50 parts by weight ・ RR (gelatin, manufactured by Nitta Gelatin Co., Ltd.) 50 parts by weight

Example 5
Production of thermal transfer image-receiving sheet 5 A thermal transfer image-receiving sheet 5 was produced in the same manner as in Example 1 except that the composition of the receiving layer-forming coating solution A was as follows.
Receiving layer forming coating liquid A5
・ VB900 (vinyl chloride emulsion, manufactured by Nissin Chemical Industry Co., Ltd.) 30 parts by weight ・ RR (gelatin, manufactured by Nitta Gelatin Co., Ltd.) 70 parts by weight

Example 6
Production of thermal transfer image receiving sheet 6 A thermal transfer image receiving sheet 6 was produced in the same manner as in Example 1 except that the composition of the receiving layer forming coating solution B was as follows.
Receiving layer forming coating solution B2
・ VB900 (vinyl chloride emulsion, manufactured by Nissin Chemical Industry Co., Ltd.) 100 parts by weight ・ KF615A (silicone release agent, manufactured by Shin-Etsu Chemical Co., Ltd.) 10.5 parts by weight Sodium dioctylsulfosuccinate for this liquid 0.2 part by weight was added.

Example 7
Production of thermal transfer image receiving sheet 7 A thermal transfer image receiving sheet 7 was produced in the same manner as in Example 1 except that the composition of the receiving layer forming coating solution B was changed as follows.
Receiving layer forming coating solution B3
・ VB900 (vinyl chloride emulsion, manufactured by Nissin Chemical Industry Co., Ltd.) 100 parts by weight ・ KF615A (silicone mold release agent, manufactured by Shin-Etsu Chemical Co., Ltd.) 12 parts by weight Sodium dioctyl sulfosuccinate is added to this solution. 2 parts by weight were added.

Example 8
Preparation of thermal transfer image-receiving sheet 8 A thermal transfer image-receiving sheet 8 was prepared in the same manner as in Example 1 except that the compositions of the receiving layer-forming coating liquids A and B were as follows.
Receiving layer forming coating liquid A6
Emulsion 1 90 parts by weight RR (gelatin, manufactured by Nitta Gelatin Co., Ltd.) 10 parts by weight
Receiving layer forming coating solution B4
Emulsion 1 100 parts by weight KF615A (silicone release agent, manufactured by Shin-Etsu Chemical Co., Ltd.) 9 parts by weight 0.2 parts by weight of sodium dioctylsulfosuccinate was added to this liquid.

Comparative Example 1
Preparation of thermal transfer image-receiving sheet 9 A thermal transfer image-receiving sheet 9 was prepared in the same manner as in Example 1 except that the composition of the receiving layer forming coating solution A was as follows.
Receiving layer forming coating liquid A7
・ VB900 (vinyl chloride emulsion, manufactured by Nissin Chemical Industry Co., Ltd.) 95 parts by weight ・ RR (gelatin, manufactured by Nitta Gelatin Co., Ltd.) 5 parts by weight

Comparative Example 2
Preparation of thermal transfer image-receiving sheet 10 A thermal transfer image-receiving sheet 10 was prepared in the same manner as in Example 1 except that the composition of the receiving layer-forming coating solution A was as follows.
Receiving layer forming coating liquid A8
・ RR (gelatin, manufactured by Nitta Gelatin Co., Ltd.) 100 parts by weight

Comparative Example 3
Preparation of thermal transfer image-receiving sheet 11 A thermal transfer image-receiving sheet 11 was prepared in the same manner as in Example 1 except that the composition of the receiving layer-forming coating solution B was as follows.
Receiving layer forming coating solution B5
・ VB900 (vinyl chloride emulsion, manufactured by Nissin Chemical Industry Co., Ltd.) 100 parts by weight ・ KF615A (silicone mold release agent, manufactured by Shin-Etsu Chemical Co., Ltd.) 5 parts by weight Sodium dioctylsulfosuccinate is added to this solution to 0 2 parts by weight were added.

Comparative Example 4
Production of Thermal Transfer Image Receiving Sheet 12 A thermal transfer image receiving sheet 12 was produced in the same manner as in Example 1 except that the composition of the receiving layer forming coating solution B was as follows.
Receiving layer forming coating solution B6
・ VB900 (vinyl chloride emulsion, manufactured by Nissin Chemical Industry Co., Ltd.) 100 parts by weight ・ KF615A (silicone release agent, manufactured by Shin-Etsu Chemical Co., Ltd.) 15 parts by weight Sodium dioctyl sulfosuccinate is added to this solution. 2 parts by weight were added.

Comparative Example 5
Preparation of Thermal Transfer Image Receiving Sheet 13 A thermal transfer image receiving sheet 13 was prepared in the same manner as in Example 1 except that only the receiving layer forming coating liquid B1 was used among the receiving layer forming coating liquids A and B.

Comparative Example 6
Production of thermal transfer image-receiving sheet 14 Of the receiving layer forming coating liquids A and B, only the receiving layer forming coating liquid B was used, and the composition of the receiving layer forming coating liquid B was as described below. The thermal transfer image receiving sheet 14 was produced in the same manner as described above.
Receiving layer forming coating solution B7
・ VB900 (vinyl chloride emulsion, manufactured by Nissin Chemical Industry Co., Ltd.) 95 parts by weight ・ KF615A (silicone release agent, manufactured by Shin-Etsu Chemical Co., Ltd.) 9 parts by weight ・ RR (gelatin, Nitta Gelatin Co., Ltd.) (Product made) 5 parts by weight Sodium dioctylsulfosuccinate was added to this liquid by 0.2 parts by weight.

Comparative Example 7
Preparation of Thermal Transfer Image Receiving Sheet 15 A thermal transfer image receiving sheet 15 was prepared in the same manner as in Example 1 except that only the receiving layer forming coating liquid B4 was used among the receiving layer forming coating liquids A and B.

Evaluation of Thermal Transfer Image Receiving Sheet For the thermal transfer image receiving sheets 1 to 15 produced above, (1) Adhesive evaluation, (2) Image density evaluation, (3) Moisture and heat bleeding evaluation, (4) Coating suitability evaluation, and (5 ) Mid-tone separability evaluation was performed.

(1) Adhesive evaluation An RGB value of 15 × n (n = n = n = n = n = n = n = n = n = n = n = n = n = n = n = n = n = n) 0 to 17) 18 gradation gradation images were printed, and a peeling test using a mending tape (manufactured by Nichiban Co., Ltd.) was performed on the printing screen, and the degree of destruction of the image was sensory evaluated.
<Evaluation criteria>
○: There was no image destruction.
Δ: A part of the image was destroyed.
X: Most of the image was destroyed.

(2) Image density evaluation An 18-gradation gradation image having an RGB value of 15 × n (n = 0 to 17) is formed on a thermal transfer image-receiving sheet produced by a sublimation thermal transfer printer (manufactured by ALTECH ADS, model: MEGAPICEL III). The image was printed, and the value at which the optical reflection density was maximized was measured by an optical densitometer (spectrolino manufactured by Gretag Macbeth).

(3) Moisture and heat resistance evaluation 18-gradation gradation image with RGB value of 15 × n (n = 0 to 17) on a thermal transfer image-receiving sheet produced by a sublimation type thermal transfer printer (manufactured by ALTECH ADS, model: MEGAPICEL III). The print was stored in an environment of 60 ° C. Free and 40 ° C. and 90% for one week, but the image blur was visually evaluated by sensory evaluation.
<Evaluation criteria>
○: It was not blurred.
Δ: Slightly blurred.
X: It was blurred.

(4) Coating suitability evaluation method The surface quality of the produced thermal transfer image-receiving sheet was subjected to sensory evaluation.
<Evaluation criteria>
○: There was no coating unevenness.
X: There was coating unevenness.

(5) Halftone releasability evaluation With a sublimation type thermal transfer printer (manufactured by ALTECH ADS, model: MEGAPICEL III), it was evaluated whether a 179 gradation gray solid image could be printed on the produced thermal transfer image receiving sheet.
<Evaluation criteria>
○: Printing was possible.
X: Printing could not be performed, and the thermal transfer sheet and the thermal transfer image-receiving sheet were fused.

The results of the above evaluations are shown in Table 1. The thermal transfer image-receiving sheets of Examples 1 to 8 satisfying the composition of the present invention have adhesiveness, image density, moisture / heat resistance, coating suitability, and halftone separation as compared with the thermal transfer image-receiving sheets of Comparative Examples 1 to 7. It can be seen that the moldability is excellent.

Claims (4)

A thermal transfer image-receiving sheet having a base material, a porous layer, a primer layer, and a receiving layer composed of at least two layers on the base material,
The receiving layer has a receiving layer A in contact with the primer layer, and a receiving layer B located farthest from the substrate;
The receiving layer A contains a resin and a hydrophilic binder, and the content of the hydrophilic binder in the receiving layer A is 8 to 90% by mass with respect to the total solid content mass of the resin and the hydrophilic binder,
The thermal transfer image-receiving sheet, wherein the receiving layer B contains a resin and a release agent, and the content of the release agent in the receiving layer B is 8 to 13% by mass with respect to the total solid content mass of the resin.   The thermal transfer image receiving sheet according to claim 1, wherein the hydrophilic binder is gelatin.   The thermal transfer image receiving sheet according to claim 1 or 2, wherein the resin is an acrylic resin and / or a vinyl chloride resin.   The thermal transfer image receiving sheet according to any one of claims 1 to 3, wherein all the layers constituting the receiving layer from the hollow layer are formed by an aqueous coating method and a simultaneous multilayer coating method.