JP2011104967A - Thermal transfer image receiving sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a thermal transfer image receiving sheet whose various performances such as back printability, blocking resistance and powder drops are improved. <P>SOLUTION: The thermal transfer image receiving sheet is formed to have a receptive layer on one surface of a base material and a back surface layer including a binder resin and silica particles on the opposite side surface of the base material to the receptive layer. The binder resin is at least one selected from the group comprising styrene-butadiene latex, methacrylate-butadiene latex and acrylate latex. The content of silica particles is 10-100 mass% of the total mass of the solid content of the binder resin. When the thermal transfer image receiving sheet satisfying the composition is used, various performances such as back printability, blocking resistance and powder drops can be improved. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a thermal transfer image-receiving sheet having a receiving layer on one surface of a substrate and a back layer containing a binder resin and silica particles on the surface of the substrate opposite to the receiving layer.

  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.

  Further, in image formation using an apparatus provided with a paper feed roller, contact between the recording paper and the inside of the recording apparatus causes back tension in the direction opposite to the transport direction, which may cause transport unevenness. . Such conveyance unevenness causes slip, overlap feed, paper feed failure, and the like, and as a result, a deviation occurs in the paper feed amount of the recording paper and the ink adhesion position, and the image is disturbed. Therefore, in order to improve performance such as transportability, for example, a thermal transfer image receiving sheet having a back layer containing a styrene butadiene rubber having a glass transition temperature of 50 to 90 ° C., polyethylene wax, and an anionic polystyrene resin is provided. It has been proposed (Patent Document 1).

  However, development of a thermal transfer image-receiving sheet having improved various properties such as backprint suitability, anti-blocking property, and dust fall is still desired.

JP 2009-83298 A

  The present invention has been made in view of the above-described background art, and the object thereof is excellent in the bleeding of the recording portion and the quick drying property of the ink by the ink jet printer or the dot impact printer, and satisfies the writing property by various writing tools. Functions of back printing suitability, blocking in the take-up state, transportability in the printer, releasability (releasability from the heat transfer sheet when the front and back of the thermal transfer image receiving sheet are mistakenly inserted into the printer), and contamination resistance Furthermore, a thermal transfer image receiving sheet that can prevent dust from falling off due to rubbing between the back surface layer and the dye receiving layer and influence on the image receiving surface (decrease in image quality such as streaks and unevenness) due to friction between the thermal transfer image receiving sheets. It is to provide.

  As a result of intensive investigations to solve the above problems, the present inventors have made the back surface layer contain binder particles and silica particles in a specific type and blending amount in a thermal transfer image-receiving sheet having a specific layer configuration. The inventors have found that the above problems can be solved, and have completed the present invention.

That is, the present invention
Having a receiving layer on one side of the substrate,
On the surface of the substrate opposite to the receiving layer, a back surface layer containing a binder resin and silica particles,
The binder resin is at least one selected from the group consisting of styrene / butadiene latex, methacrylate ester / butadiene latex, and acrylate latex,
The present invention provides a thermal transfer image-receiving sheet in which the content of the silica particles is 10 to 100% by mass with respect to the total solid mass of the binder resin.

  According to the thermal transfer image-receiving sheet of the present invention, it is possible to improve various performances such as backprint suitability, blocking resistance, and dust fall.

Thermal transfer image-receiving sheet The thermal transfer image-receiving sheet of the present invention has a receiving layer on one surface of a substrate, and has a back layer containing a binder resin and silica particles on the surface opposite to the receiving layer of the substrate. Is.

Substrate In the present invention, the substrate has a role of holding the receiving layer on one side and the back layer on the other side, and since heat is applied during thermal transfer, there is no problem in handling even in an overheated state. It is preferable that the material has a mechanical strength of

  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 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.

Back layer The back layer in the present invention has the fixability of ink used in an ink jet method, a dot impact method, a writing instrument, and the like, and enables a back print excellent in quick-drying with less bleeding of the recording portion ( To improve the backprint suitability). Furthermore, it also has the basic characteristics as the image receiving paper back side described below.
1. When superposed on the receiving layer surface, no sticking (blocking) occurs even if it is stored under a temperature or load.
2. Even when the image receiving paper is mistakenly mounted on the printer with the front and back sides reversed and heat transfer is performed by superimposing it on the heat transfer sheet, it will not stick to the heat transfer sheet and will not clog in the printer. (Has back surface releasability).
3. Even if it rubs against the receiving layer surface, the receiving layer surface is not damaged, and the particle component does not fall off (powder off) from the back layer.
The back layer contains a binder resin and silica particles, and other additives such as an antifoaming agent and an antistatic agent can be appropriately added to the back layer. In recent years, a water-based coating method is preferred from the viewpoint of environmental considerations, but the back layer of the present invention can be particularly suitably used as the back surface of an image receiving paper on which a receiving layer is formed by a water-based coating method.

  The binder resin contained in the back layer is at least one selected from the group consisting of styrene / butadiene latex, methacrylate ester / butadiene latex, and acrylate latex. The glass transition temperature of these binder resins is preferably -50 to 50 ° C, more preferably -40 to 40 ° C. By using such a binder resin, the adhesiveness to the base material is good, silica is retained, powder fall-off can be prevented, and better backprinting aptitude can be obtained. In the present invention, a commercially available binder resin can also be used, such as Luck Star DS-602 (SBR latex, Tg = -15 ° C., manufactured by DIC Corporation), Luck Star DS-820 (MBR latex, Tg = −40 ° C., manufactured by DIC Corporation), Nipol SX1707A (acrylate latex, Tg = 10 ° C., manufactured by Nippon Zeon Co., Ltd.), Nipol LX844C (acrylate latex, Tg = 32 ° C., manufactured by Nippon Zeon Corporation) SR-103 (SBR latex, Tg = 0 ° C., manufactured by Nippon A & L Co., Ltd.) and the like are preferable.

  The silica particles contained in the back layer are preferably those having an average particle diameter of 1 to 20 μm. If the average particle size is in the above range, blocking and powder falling can be prevented, and good backprint suitability can be imparted. Moreover, content of the silica particle in a back surface layer is 10-100 mass% with respect to the total solid content mass of binder resin, Preferably it is 25-75 mass%. If content of a silica particle is about the said range, a backprint suitability can be improved and blocking and powder fall-off can be prevented. In the present invention, commercially available silica particles can also be used. Cicilia 380 (silica particles, average particle size 9.0 μm, oil absorption 280 ml / 100 g, manufactured by Fuji Silysia Chemical Co., Ltd.), NIPGEL AY-200 (silica particles) , Average particle size 2.3 μm, oil absorption 280 ml / 100 g, manufactured by Tosoh Silica Co., Ltd., NIPGEL CX-400 (silica particles, average particle size 4.0 μm, oil absorption 100 ml / 100 g, Tosoh Silica Co., Ltd.) Manufactured), NIPGEL AZ-6A0 (silica particles, average particle size 4.0 μm, oil absorption 315 ml / 100 g, manufactured by Tosoh Silica Co., Ltd.), NIPGEL AY-451 (silica particles, average particle size 4.0 μm, oil absorption) 260 ml / 100 g, manufactured by Tosoh Silica Co., Ltd.), and NIPGEL BY-601 (silica particles, Average particle diameter 5.0 .mu.m, oil absorption 200 ml / 100 g, manufactured by Tosoh Silica Corporation) and the like are preferable.

In the present invention, but are not coating amount of the back layer is particularly limited, it is preferable that the coating amount is in the range of drying after ^{0.1g / m 2 ~3.0g / m 2} , 0.3g / More preferably, it is in the range of m ^{2 to} 1.5 g / m ² . If the amount is too small, the suitability for backprinting may be insufficient, and if it is too large, powder falling may occur.

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. The receiving layer is not particularly limited as long as it is formed by an aqueous coating method. According to a preferred embodiment, the receiving layer can contain a resin, a hydrophilic binder, a release agent and the like according to various purposes. Further, the receiving layer may be composed of two or more layers. 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.

  Examples of the release agent contained in the receiving layer in the present invention include silicone oil (including reaction curable silicone), phosphate ester plasticizer, and fluorine compound, and silicone oil is particularly 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.

Other Layers The thermal transfer image receiving sheet of the present invention may further have other layers other than the above layers. In a preferred embodiment, the thermal transfer image-receiving sheet can further have other layers such as a porous layer, a primer layer, an intermediate layer, and a release layer on the receiving layer side.

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. In a preferred embodiment, 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, for example in the range of ^{0.1g / cm 3 ~0.8g / cm 3} , preferably in the range of inter alia 0.2g ^/ cm ³ ~0.7g ^/ cm 3 .

  The average particle diameter 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, HP-1055, HP-91, Ropeke SE (manufactured by Rohm and Haas Co., Ltd.), MH-5055 (Nippon Zeon) and the like are preferable.

  The above-mentioned “average particle diameter” is “volume average particle diameter” and can be determined, for example, as follows. A water dispersion is prepared by dispersing the hollow particles in water, and the water dispersion of the hollow particles is dried to form a dry body, which is then transferred to a transmission electron microscope (manufactured by Hitachi High-Technologies Corporation). Then, particles (100 particles) forming hollow particles in the dried body were observed, the diameter (outer diameter) on the outer surface side of each particle was measured, and these values were averaged to obtain an average particle diameter. The “average hollow ratio” can be determined as follows. A water dispersion is prepared by dispersing the hollow particles in water, and the water dispersion of the hollow particles is dried to form a dry body, which is then transferred to a transmission electron microscope (manufactured by Hitachi High-Technologies Corporation). Then, the particles (100 particles) forming the hollow particles in the dried body were observed, the diameter (inner diameter) on the inner surface side of each particle was measured, and the average value of these values was taken as 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.

  In the present invention, the acrylic resin refers to 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 derivatives. It includes a copolymer with a monomer or a derivative thereof, and a copolymer of a monomer of an acrylate ester or a methacrylate ester with another monomer or a derivative 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 acid ester or methacrylic acid ester monomer include alkyl acrylate and alkyl methacrylate, preferably methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, butyl acrylate, butyl methacrylate, lauryl acrylate, and lauryl methacrylate. 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.

  According to a preferred embodiment of the present invention, the hydrophilic binder contained in the porous layer, primer layer, and receiving layer includes gelatin and derivatives thereof, polyvinyl alcohol, polyethylene oxide, polyvinyl pyrrolidone, pullulan, carboxymethyl cellulose. , Hydroxyethyl cellulose, 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, especially Gelatin is preferred. By using such a hydrophilic binder, interlayer adhesion of each layer can be improved. 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.

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.

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.

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, known methods such as roll coating, bar coating, gravure coating, gravure reverse coating, die coating, slide coating, and curtain coating can be used. A method in which a plurality of layers such as a slide coat and a curtain coat can be applied simultaneously in multiple layers is preferred. In the present invention, it is preferable to form all the layers constituting the receiving layer from the porous layer on the side having the receiving 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: MEGAPICEL 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.

Example 1
Preparation of thermal transfer image-receiving sheet 1 RC paper (Mitsubishi Paper Co., Ltd., trade name: STF-150) was used as a base sheet, and on one side, a coating solution 1 for forming a back layer having the following composition was wire bar coated. Was applied so that the coating amount after drying was 0.5 g / m ² and dried at 50 ° C. for 2 minutes.
Composition of backside layer forming coating solution 1 Lack Star DS-602 (SBR latex, Tg = -15 ° C., manufactured by DIC Corporation)
100 parts by weight-Cycilia 380 (silica particles, average particle size 9.0 μm, oil absorption 280 ml / 100 g, manufactured by Fuji Silysia Chemical Ltd.) 75 parts by weight

Subsequently, on the other surface, the composition of porous layer A forming coating liquid 1, porous layer B forming coating liquid 1, primer layer forming coating liquid 1 having the following composition, receiving layer A forming coating The working solution 1 and the coating solution 1 for forming the receiving layer B were heated to 40 ° C., and applied using slide coating so that the thickness at the time of WET was 10 μm, 25 μm, 15 μm, 5 μm, and 8 μm, respectively. After cooling at 30 ° C. for 30 seconds, drying at 50 ° C. for 2 minutes, thermal transfer image-receiving sheet 1 (layer constitution: back layer / substrate / porous layer A / porous layer B / primer layer / receptive layer A / receptor) Layer B) was obtained. The coating speed was 250 m / min.
Composition of coating liquid 1 for forming porous layer A: Ropaque HP-91 (hollow particles, average particle size 1 μm, average hollow ratio 50%, manufactured by Rohm and Haas Co., Ltd.) 60 parts by weight RR (gelatin, Nitta 20 parts by weight of Luckstar DM-820 (MBR resin, manufactured by DIC Corporation) 20 parts by weight of Surfynol 440 (surfactant, manufactured by Nissin Chemical Industry Co., Ltd.) 0.15 Diluted by adding 400 parts by weight of water.
Composition of coating liquid 1 for forming porous layer B: Ropaque HP-91 (hollow particles, average particle diameter 1 μm, average hollow ratio 50%, manufactured by Rohm and Haas Co., Ltd.) 70 parts by weight RR (gelatin, Nitta Gelatin Co., Ltd.) 25 parts by weight Hydran AP-40 (polyester / urethane resin, DIC Co., Ltd.) 5 parts by weight Surfynol 440 (surfactant, manufactured by Nissin Chemical Industry Co., Ltd.) 0. Diluted by adding 500 parts of 2 parts by weight of water.
Composition of primer layer forming coating solution 1 SX-866 (cross-linked hollow particles, average particle size 0.3 μm, average hollow ratio 30%, manufactured by JSR Corporation) 70 parts by weight RR (gelatin, new Ta Gelatin Co., Ltd.) 25 parts by weight NKJ300 (acrylic resin, Shin-Nakamura Chemical Co., Ltd.) 5 parts by weight Surfynol 440 (surfactant, manufactured by Nissin Chemical Industry Co., Ltd.) 0.2 Diluted by adding 500 parts by weight of water.
Composition of Receptive Layer A Forming Coating Liquid 1 • Viniblanc 900 (vinyl chloride / acrylic resin, manufactured by Nissin Chemical Industry Co., Ltd.) 90 parts by weight • RR (gelatin, manufactured by Nitta Gelatin Co., Ltd.) 10 parts by weight water 250 Part was added to dilute.
Composition of Receptive Layer B Forming Coating Liquid 1 • ViniBran 900 (vinyl chloride / acrylic resin, manufactured by Nissin Chemical Industry Co., Ltd.) 90 parts by weight • KF-615A (silicone release agent, Nissin Chemical Industry Co., Ltd.) 10 parts by weight Surfynol 440 (surfactant, manufactured by Nissin Chemical Industry Co., Ltd.) 0.5 parts by weight 150 parts of water was added for dilution.

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 coating solution for forming the back layer was as follows.
Composition of back surface layer forming coating solution 2 Lack Star DS-602 (SBR latex, Tg = -15 ° C., manufactured by DIC Corporation)
100 parts by weight-NIPGEL AY-200 (silica particles, average particle size 2.3 μm, oil absorption 280 ml / 100 g, manufactured by Tosoh Silica Co., Ltd.) 75 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 coating solution for forming the back surface layer was as follows.
Composition of back surface layer forming coating solution 3 Lack Star DS-602 (SBR latex, Tg = -15 ° C., manufactured by DIC Corporation)
100 parts by weight-NIPGEL CX-400 (silica particles, average particle size 4.0 μm, oil absorption 100 ml / 100 g, manufactured by Tosoh Silica Co., Ltd.) 75 parts by weight

Example 4
Preparation of thermal transfer image-receiving sheet 4 A thermal transfer image-receiving sheet 4 was prepared in the same manner as in Example 1 except that the composition of the coating solution for forming the back layer was as follows.
Composition of Back Layer Formation Coating Liquid 4 Luck Star DS-602 (SBR Latex, Tg = -15 ° C., manufactured by DIC Corporation)
100 parts by weight · NIPGEL AZ-6A0 (silica particles, average particle size 4.0 μm, oil absorption 315 ml / 100 g, manufactured by Tosoh Silica Co., Ltd.) 75 parts by weight

Example 5
Preparation of thermal transfer image-receiving sheet 5 A thermal transfer image-receiving sheet 5 was prepared in the same manner as in Example 1 except that the composition of the coating solution for forming the back layer was as follows.
Composition of back surface layer forming coating solution 5 Lack Star DS-602 (SBR latex, Tg = -15 ° C., manufactured by DIC Corporation)
100 parts by weight · NIPGEL AY-451 (silica particles, average particle size 4.0 μm, oil absorption 260 ml / 100 g, manufactured by Tosoh Silica Co., Ltd.) 75 parts by weight

Example 6
Preparation of thermal transfer image-receiving sheet 6 A thermal transfer image-receiving sheet 6 was prepared in the same manner as in Example 1 except that the composition of the coating solution for forming the back layer was as follows.
Composition of back surface layer forming coating solution 6 Lack Star DS-602 (SBR latex, Tg = -15 ° C., manufactured by DIC Corporation)
100 parts by weight · NIPGEL BY-601 (silica particles, average particle size 5.0 μm, oil absorption 200 ml / 100 g, manufactured by Tosoh Silica Co., Ltd.) 75 parts by weight

Example 7
Preparation of thermal transfer image-receiving sheet 7 A thermal transfer image-receiving sheet 7 was prepared in the same manner as in Example 1 except that the composition of the coating solution for forming the back layer was as follows.
Composition of back surface layer forming coating solution 7 Lack Star DS-602 (SBR latex, Tg = -15 ° C., manufactured by DIC Corporation)
100 parts by weight · NIPGEL CX-400 (silica particles, average particle size 4.0 μm, oil absorption 100 ml / 100 g, manufactured by Tosoh Silica Co., Ltd.) 50 parts by weight

Example 8
Production of Thermal Transfer Image Receiving Sheet 8 A thermal transfer image receiving sheet 8 was produced in the same manner as in Example 1 except that the composition of the coating solution for forming the back surface layer was as follows.
Composition of back surface layer forming coating solution 8 Lack Star DS-602 (SBR latex, Tg = -15 ° C., manufactured by DIC Corporation)
100 parts by weight-NIPGEL CX-400 (silica particles, average particle size 4.0 μm, oil absorption 100 ml / 100 g, manufactured by Tosoh Silica Co., Ltd.) 25 parts by weight

Example 9
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 coating solution for forming the back layer was as follows.
Composition of back surface layer forming coating solution 9 Nipol SX1707A (acrylate latex, Tg = 10 ° C., manufactured by Nippon Zeon Co., Ltd.) 100 parts by weight NIPGEL AY-200 (silica particles, average particle size 2.3 μm, oil absorption 280ml / 100g, manufactured by Tosoh Silica Co., Ltd.) 50 parts by weight

Example 10
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 coating solution for forming the back layer was as follows.
Composition of coating solution 10 for forming the back layer Nipol SX1707A (acrylate latex, Tg = 10 ° C., manufactured by Nippon Zeon Co., Ltd.) 100 parts by weight NIPGEL AY-200 (silica particles, average particle size 2.3 μm, oil absorption 280 ml / 100 g, manufactured by Tosoh Silica Co., Ltd.) 100 parts by weight

Example 11
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 coating solution for forming the back layer was as follows.
Composition of back surface layer forming coating solution 11 Lackstar DM-820 (MBR latex, Tg = −40 ° C., manufactured by DIC Corporation)
100 parts by weight-Cycilia 380 (silica particles, average particle size 9.0 μm, oil absorption 280 ml / 100 g, manufactured by Fuji Silysia Chemical Ltd.) 75 parts by weight

Example 12
Preparation of thermal transfer image-receiving sheet 12 A thermal transfer image-receiving sheet 12 was prepared in the same manner as in Example 1 except that the composition of the coating solution for forming the back layer was as follows.
Composition of back surface layer forming coating solution 12 • Nipol SX1707A (acrylate latex, Tg = 10 ° C., manufactured by Nippon Zeon Co., Ltd.) 100 parts by weight • Cycilia 380 (silica particles, average particle size 9.0 μm, oil absorption 280 ml) / 100 g, manufactured by Fuji Silysia Chemical Ltd.) 75 parts by weight

Example 13
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 the composition of the coating solution for forming the back surface layer was as follows.
Composition of coating liquid 13 for forming the back layer Nipol LX844C (acrylate latex, Tg = 32 ° C., manufactured by Nippon Zeon Co., Ltd.) 100 parts by weight Sicily 380 (silica particles, average particle size 9.0 μm, oil absorption 280 ml / 100 g, manufactured by Fuji Silysia Chemical Ltd.) 75 parts by weight

Example 14
Preparation of thermal transfer image-receiving sheet 14 A thermal transfer image-receiving sheet 14 was prepared in the same manner as in Example 1 except that the composition of the coating solution for forming the back surface layer was as follows.
Composition of backside layer forming coating solution 14 SR-103 (SBR latex, Tg = 0 ° C., manufactured by Nippon A & L Co., Ltd.)
100 parts by weight-Cycilia 380 (silica particles, average particle size 9.0 μm, oil absorption 280 ml / 100 g, manufactured by Fuji Silysia Chemical Ltd.) 75 parts by weight

Comparative Example 1
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 the composition of the coating solution for forming the back layer was as follows.
Composition of back surface layer forming coating solution 15 Lack Star DS-602 (SBR latex, Tg = -15 ° C., manufactured by DIC Corporation)
100 parts by weight

Comparative Example 2
Preparation of thermal transfer image receiving sheet 16 A thermal transfer image receiving sheet 16 was prepared in the same manner as in Example 1 except that the composition of the coating solution for forming the back layer was as follows.
Composition of coating liquid 16 for forming the back layer / Luckster DM-820 (MBR latex, Tg = −40 ° C., manufactured by DIC Corporation)
100 parts by weight

Comparative Example 3
Preparation of thermal transfer image receiving sheet 17 A thermal transfer image receiving sheet 17 was prepared in the same manner as in Example 1 except that the composition of the coating solution for forming the back surface layer was as follows.
Composition of back surface layer forming coating solution 17 Nipol SX1707A (acrylate latex, Tg = 10 ° C., manufactured by Nippon Zeon Co., Ltd.) 100 parts by weight

Comparative Example 4
Preparation of thermal transfer image receiving sheet 18 A thermal transfer image receiving sheet 18 was prepared in the same manner as in Example 1 except that the composition of the coating solution for forming the back surface layer was as follows.
Composition of back surface layer forming coating solution 18 SR-103 (SBR latex, Tg = 0 ° C., manufactured by Nippon A & L Co., Ltd.)
100 parts by weight

Comparative Example 5
Production of thermal transfer image receiving sheet 19 A thermal transfer image receiving sheet 19 was produced in the same manner as in Example 1 except that the composition of the coating solution for forming the back layer was as follows.
Composition of coating liquid 19 for forming the back surface layer • Hydran AP-40N (urethane resin, Tg = 55 ° C., manufactured by DIC Corporation)
100 parts by weight

Comparative Example 6
Preparation of thermal transfer image-receiving sheet 20 A thermal transfer image-receiving sheet 20 was prepared in the same manner as in Example 1 except that the composition of the coating solution for forming the back layer was as follows.
Composition of coating liquid 20 for forming the back layer・ Hydran AP-70 (urethane resin, Tg = −4 ° C., manufactured by DIC Corporation)
100 parts by weight

Comparative Example 7
Preparation of thermal transfer image receiving sheet 21 A thermal transfer image receiving sheet 21 was prepared in the same manner as in Example 1 except that the composition of the coating solution for forming the back surface layer was as follows.
Composition of backside layer-forming coating solution 21 Superflex SF-130 (urethane resin, Tg = 101 ° C., manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) 100 parts by weight

Comparative Example 8
Thermal transfer image receiving sheet 22 Preparation A thermal transfer image receiving sheet 22 was prepared in the same manner as in Example 1 except that the composition of the coating solution for forming the back layer was as follows.
Composition of coating liquid 22 for forming back layer / Luckster DS-602 (SBR latex, Tg = −15 ° C., manufactured by DIC Corporation)
100 parts by weight / Cycilia 380 (silica particles, average particle size 9.0 μm, oil absorption 280 ml / 100 g, manufactured by Fuji Silysia Chemical Ltd.) 150 parts by weight

Comparative Example 9
Preparation of thermal transfer image receiving sheet 23 A thermal transfer image receiving sheet 23 was prepared in the same manner as in Example 1 except that the composition of the coating solution for forming the back layer was as follows.
Composition of coating liquid 23 for forming back layer / Luckster DS-602 (SBR latex, Tg = −15 ° C., manufactured by DIC Corporation)
100 parts by weight-NIPGEL AY-200 (silica particles, average particle size 2.3 μm, oil absorption 280 ml / 100 g, manufactured by Tosoh Silica Co., Ltd.) 150 parts by weight

Comparative Example 10
Preparation of thermal transfer image receiving sheet 24 A thermal transfer image receiving sheet 24 was prepared in the same manner as in Example 1 except that the composition of the coating solution for forming the back layer was as follows.
Composition of coating liquid 24 for forming back layer / hydran AP-40N (urethane resin, Tg = 55 ° C., manufactured by DIC Corporation)
100 parts by weight-Cycilia 380 (silica particles, average particle size 9.0 μm, oil absorption 280 ml / 100 g, manufactured by Fuji Silysia Chemical Ltd.) 75 parts by weight

Comparative Example 11
Preparation of thermal transfer image-receiving sheet 25 A thermal transfer image-receiving sheet 25 was prepared in the same manner as in Example 1 except that the composition of the coating solution for forming the back surface layer was as follows.
Composition of coating liquid 25 for forming back layer / hydran AP-70 (urethane resin, Tg = −4 ° C., manufactured by DIC Corporation)
100 parts by weight-Cycilia 380 (silica particles, average particle size 9.0 μm, oil absorption 280 ml / 100 g, manufactured by Fuji Silysia Chemical Ltd.) 75 parts by weight

Comparative Example 12
Preparation of thermal transfer image receiving sheet 26 A thermal transfer image receiving sheet 26 was prepared in the same manner as in Example 1 except that the composition of the coating solution for forming the back surface layer was as follows.
Composition of backside layer-forming coating solution 26 Superflex SF-130 (urethane resin, Tg = 101 ° C., Daiichi Kogyo Seiyaku Co., Ltd., solid content 35% by weight) 100 parts by weight Cicilia 380 (silica particles , Average particle size 9.0 μm, oil absorption 280 ml / 100 g, manufactured by Fuji Silysia Chemical Ltd.) 75 parts by weight

Evaluation of Thermal Transfer Image Receiving Sheet The thermal transfer image receiving sheets 1 to 26 produced above were subjected to (1) backprint suitability evaluation, (2) blocking resistance evaluation, and (3) dust drop evaluation.

(1) Backprint suitability evaluation / evaluation method Using the impact dot printer iDP3550 (manufactured by Citizen Systems Co., Ltd.) and a dedicated ribbon cassette (black), test the back layer of the thermal transfer image-receiving sheets 1 to 26 produced above. After printing for a predetermined time, Cy solid (tone value 38/255) was printed on the back layer separately using a sublimation thermal transfer printer (manufactured by ALTECH ADS, model: MEGAPIXELIII) and a MEGAPIXELIII genuine ribbon. The receiving layer surfaces are stacked, sandwiched between 125 μm PET films, treated with a laminator (Lami Packer LPD3204, Fuji Plastic Co., Cold mode, speed 2.5), and the presence or absence of transfer to the receiving layer is confirmed. Evaluation was made according to criteria. The following results are shown in Table 1. In addition, the thing of evaluation (circle) has the absorptivity and quick-drying property of the ink of the level which is satisfactory practically.
-Evaluation criteria ○: There was no setback to the receiving layer.
Δ: Slight setback to the receiving layer occurred.
X: The setback to the receiving layer was apparently generated.

(2) Blocking resistance evaluation / evaluation method About the thermal transfer image receiving sheets of Examples and Comparative Examples prepared above, using the thermal transfer image receiving sheets produced in the same Examples and Comparative Examples, the back side of the thermal transfer image receiving sheet, The other thermal transfer image-receiving sheet facing the dye-receiving layer side and being superposed is 20 kg in a state where it is sandwiched between synthetic paper having a thickness of 150 μm (manufactured by YUPO Corporation, YUPO FPG # 150). / 105mm x 148mm, left in an oven at 60 ° C for 150 hours, peel off the overlapped receiving layer surface and back surface, and visually observe whether printing unevenness occurs or not. The blocking resistance was evaluated. However, after the above load, the printing unevenness was evaluated by printing a test pattern using a thermal transfer printer CP9500D manufactured by Mitsubishi Electric Corporation in combination with a thermal transfer sheet dedicated to the thermal transfer printer CP9500D.
-Evaluation criteria ○: Printing unevenness did not occur and blocking did not occur.
X: Printing unevenness occurred and blocking occurred.

(3) Powder fall-off evaluation / evaluation method The back surface layer of the sample cut into 10 cm square was rubbed 10 times with 5 cm square black drawing paper, and visual evaluation was performed.
・ Evaluation criteria ○: Powder fall did not occur.
Δ: Slight dusting occurred, but there was no problem in practical use.
X: Powder fall-off occurred.

The results of the above evaluations are shown in Table 1. It turns out that the thermal transfer image receiving sheet of Examples 1-14 which satisfy | fills the composition of this invention is excellent in backprint suitability, blocking resistance, and dust fall compared with the thermal transfer image receiving sheet of Comparative Examples 1-12.

Claims (5)

Having a receiving layer on one side of the substrate,
On the surface of the substrate opposite to the receiving layer, a back surface layer containing a binder resin and silica particles,
The binder resin is at least one selected from the group consisting of styrene / butadiene latex, methacrylate ester / butadiene latex, and acrylate latex,
The thermal transfer image-receiving sheet, wherein the content of the silica particles is 10 to 100% by mass with respect to the total solid mass of the binder resin.   The thermal transfer image receiving sheet according to claim 1, wherein the content of the silica particles is 25 to 75 mass% with respect to the total solid content mass of the binder resin.   The thermal transfer image-receiving sheet according to claim 1 or 2, wherein the binder resin has a glass transition temperature of -50 to 50 ° C.   The thermal transfer image-receiving sheet according to any one of claims 1 to 3, wherein an average particle diameter of the silica particles is 1 to 20 µm.   The thermal transfer image receiving sheet according to claim 1, wherein the receiving layer is formed by an aqueous coating method.