JP2013082218A - Thermal transfer image receiving sheet and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thermal transfer image receiving sheet in which such various performances as handling properties, scratch resistance, back print adaptability, blocking resistance and frictional adaptability are improved, and a method for manufacturing the same.SOLUTION: The thermal transfer image receiving sheet 10 includes: a substrate 11; a receiving layer 15 on one face of the substrate; and a back surface layer 16 including a binder resin and a colloidal silica on the face of the opposite side of the receiving layer of the substrate, and the mean particle diameter of the colloidal silica is 20-500 nm.

Description

  The present invention relates to a thermal transfer image-receiving sheet, and more specifically, a back surface containing a base material, one side of the base material, a receiving layer, and a side of the base material opposite to the receiving layer, a binder resin and colloidal silica. And a method for producing the same.

  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 (see, for example, Patent Document 1).

  Another problem is that the antistatic property of the surface (receiving layer) of the image receiving sheet is low, and the electrostatic sticking between the printed products causes a deterioration in handling (hereinafter referred to as “separation”). ing. Therefore, in order to improve antistatic properties, it has also been proposed to include specific colloidal silica in the back surface layer (see Patent Documents 2 to 5).

JP 2009-83298 A JP-A-8-62778 JP 2003-63153 A Japanese Patent Laid-Open No. 2004-130753 JP 2007-237639 A JP 2011-104967 A

  As a result of examining the above-mentioned background art, the present inventors have been able to include a specific binder resin and silica particles in the back layer in order to improve backprint suitability and blocking resistance (for example, patents). (See Document 6), and found that the image receiving surface was damaged when the back side of the thermal transfer image receiving sheet and the receiving layer side were rubbed.

  The present invention has been made in view of the above-mentioned background art and newly discovered problems, and its purpose is to improve various performances such as judgment, scratch resistance, backprint suitability, blocking resistance, and friction suitability. Another object is to provide a thermal transfer image receiving sheet and a method for producing the same.

  As a result of intensive studies to solve the above problems, the present inventors have made it possible to incorporate colloidal silica having a specific average particle diameter into the back surface layer in the thermal transfer image-receiving sheet having a specific layer structure. It was found that can be solved. The present invention has been completed based on such findings.

That is, according to one aspect of the present invention,
A substrate;
A receptor layer on one side of the substrate;
On the surface opposite to the receiving layer of the base material, a back surface layer containing a binder resin and colloidal silica is provided.
A thermal transfer image-receiving sheet is provided in which the colloidal silica has an average particle size of 20 to 500 nm.

  In the aspect of the present invention, it is preferable that the back layer further comprises a friction modifier.

  In the aspect of the present invention, it is preferable that the friction modifier comprises silica particles.

  In the aspect of the present invention, it is preferred that the back layer further comprises a film forming aid.

  In an embodiment of the present invention, the film-forming aid is isopropyl alcohol, 2-butanol, methyl cellosolve, ethyl cellosolve, butyl cellosolve, butyl cellosolve, diethylene glycol monoalkyl ether, solfit, polypropylene glycol monomethyl ether, propylene glycol monoethyl ether It preferably comprises at least one selected from the group consisting of acetate, texanol, and N-methyl-2-pyrrolidone.

  In the embodiment of the present invention, it is preferable that the binder resin comprises a polymer latex.

  In the embodiment of the present invention, the binder resin preferably comprises an emulsion having a glass transition temperature of 70 ° C. or higher.

  In the aspect of the present invention, it is preferable that the binder resin comprises at least one selected from the group consisting of styrene / acrylic resins, polyester resins, polyurethane resins, and acrylic resins.

  In the aspect of this invention, it is preferable that content of this colloidal silica is 100-600 mass% with respect to the total solid content mass of this binder resin.

  In the aspect of the present invention, the back layer preferably contains at least two types of colloidal silica having different average particle diameters.

  In the aspect of the present invention, the content of the friction modifier is preferably 20% by mass or less based on the total solid mass of the back surface layer.

  In the embodiment of the present invention, the silica particles preferably have an average particle diameter of 1 to 10 μm.

  In the aspect of the present invention, the back layer is preferably formed by an aqueous coating method.

  In the embodiment of the present invention, the receiving layer is preferably formed by an aqueous coating method.

According to another aspect of the invention,
A method for producing a thermal transfer image receiving sheet, comprising: a base material; a receiving layer on one surface of the base material; and a back layer on a surface opposite to the receiving layer of the base material,
There is provided a method for producing a thermal transfer image-receiving sheet, comprising a step of forming the back layer using a back surface layer coating solution comprising a binder resin and colloidal silica having an average particle diameter of 20 to 500 nm. The

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

1 is a schematic cross-sectional view showing an embodiment of a thermal transfer image receiving sheet according to the present invention.

Thermal transfer image-receiving sheet The thermal transfer image-receiving sheet of the present invention comprises a base material, a receiving layer on one surface of the base material, and a back layer containing a binder resin and colloidal silica on the surface of the base material opposite to the receiving layer. Is provided. In a preferred embodiment, the thermal transfer image receiving sheet may further have a hollow layer or a primer layer between the substrate and the receiving layer. Hereinafter, the structure of the thermal transfer image receiving sheet of the present invention will be described with reference to the drawings.

  According to one aspect of the present invention, on one surface of the substrate, two hollow layers, a primer layer, and a receiving layer are provided in this order, and the surface of the substrate opposite to the receiving layer. There is provided a thermal transfer image-receiving sheet having a back layer thereon. Specifically, a schematic cross-sectional view of one embodiment of the thermal transfer image receiving sheet according to the present invention is shown in FIG. A thermal transfer image receiving sheet 10 shown in FIG. 1 includes a base material 11, a hollow layer A (lower layer) 12, a hollow layer B (upper layer) 13, a primer layer 14, and a receiving surface on one surface of the base material 11. The layer 15 is provided in this order, and the back layer 16 is provided on the surface of the substrate opposite to the receiving layer. Hereinafter, each layer constituting the thermal transfer image receiving sheet of the present invention will be described.

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 heat is applied at the time of thermal transfer. A material having a certain level of mechanical strength is preferred.

  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 or a porous 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, cellulose fiber paper and plastic film, or a combination of plastic film and synthetic paper. Furthermore, resin-coated paper (RC paper) in which the front and back surfaces of cellulose fiber paper are coated with polyethylene or polypropylene resin can be used. In the present invention, a commercially available base material can be used, and for example, RC paper for photography manufactured by Mitsubishi Paper Industries Co., Ltd. is 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 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 colloidal silica, 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.

  Colloidal silica contained in the back layer is a colloid composed of fine particles of inorganic oxide containing silicon having an average particle size of several hundred nm or less. Colloidal silica contains silicon dioxide (including its hydrate) as a main component, and may contain aluminate as a minor component. Examples of the aluminate that may be contained as a minor component include sodium aluminate and potassium aluminate. In addition, colloidal silica may contain inorganic salts such as sodium hydroxide, potassium hydroxide, lithium hydroxide and ammonium hydroxide, and organic salts such as tetramethylammonium hydroxide. These inorganic salts and organic salts act, for example, as colloid stabilizers.

  There is no restriction | limiting in particular as a dispersion medium of colloidal silica, Any of water, an organic solvent, and these mixtures may be sufficient. The organic solvent may be a water-soluble organic solvent or a water-insoluble organic solvent, but is preferably a water-soluble organic solvent. Specifically, methanol, ethanol, isopropyl alcohol, n-propanol etc. can be mentioned. Those dispersed in water are called aqueous sols, and those dispersed in organic solvents are called organosols.

  There is no restriction | limiting in particular in the manufacturing method of colloidal silica, It can manufacture by the method used normally. For example, it can be produced from aerosil synthesis by thermal decomposition of silicon tetrachloride or water glass. Alternatively, it can also be produced by a liquid phase synthesis method such as hydrolysis of alkoxide.

  The average particle diameter of the colloidal silica in the present invention is 20 to 500 nm, preferably 20 to 250 nm, more preferably 20 to 150 nm. When the average particle diameter is in the above range, colloidal silica is likely to protrude on the surface of the formed back surface layer, and excellent effects such as blocking resistance, friction characteristics, and charging characteristics possessed by colloidal silica can be exhibited. If the average particle diameter is 500 nm or less, the colloidal silica can be prevented from being lost from the coating film, although it depends on the thickness of the dried coating film and the blending amount of the colloidal silica. Moreover, it is preferable that a back surface layer contains at least 2 types of colloidal silica from which an average particle diameter differs. By including at least two kinds of colloidal silicas having different average particle diameters, it is possible to appropriately fill the gaps formed between the large particle diameter colloidal silicas, and to strengthen the formed coating film, It is also preferable in terms of anti-powder resistance.

  In the present invention, the average particle size of colloidal silica can be measured by a conventionally known method such as a BET method, a Sears method, a centrifugal sedimentation method, a dynamic light scattering method, or a laser diffraction method. For example, when the colloidal silica particles are spherical and the particle size is 10 nm or less, the Sears method is used. When the particles are spherical and the particle size is 5 to 100 nm, the BET method is used. When the particles are spherical and the particle size is 70 to 500 nm, centrifugation is performed. In the sedimentation method, when the particles are chain-like and the particle size is 40 to 300 nm, the measurement can be performed by the dynamic light scattering method.

  The content of colloidal silica in the back layer is preferably 100 to 600% by mass, more preferably 150 to 500% by mass, and still more preferably 200 to 300% with respect to the total solid mass of the binder resin. is there. When the content of colloidal silica is 100% by mass or more, it is possible to sufficiently ensure friction characteristics, scratch resistance, suitability for backprinting, and blocking resistance. Moreover, if it is 600 mass% or less, anti-powder resistance can be satisfied.

  In the present invention, commercially available colloidal silica can also be used, Adelite AT-50 (manufactured by ADEKA), Snowtex 50, Snowtex PS-S, Snowtex PS-M, Snowtex UP, Snowtex CM , Snowtex ZL, Snowtex MP-2040, Snowtex MP-1040, Snowtex 20L (manufactured by Nissan Chemical Industries, Ltd.) are preferred.

  The binder resin contained in the back layer preferably contains an emulsion having a glass transition temperature of 70 ° C. or higher. By using an emulsion having a glass transition temperature of 70 ° C. or higher, the dried coating film does not form a film completely, and the emulsion particles are in a clustered state, making it easy to absorb the backprint ink and being hard like silica particles. There is no damage to the receiving layer. Moreover, blocking resistance is not impaired by Tg being 70 degreeC or more. The glass transition temperature can be measured by a conventionally known method such as differential scanning calorimetry (DSC method) or dynamic viscoelasticity measurement method (DMA method).

  The binder resin contained in the back layer preferably contains at least one selected from the group consisting of styrene / acrylic resins, polyester resins, polyurethane resins, and acrylic resins. By using such a binder resin, it is possible to have good adhesion to the base material and good backprint suitability. Furthermore, it is also preferable in terms of dispersibility (charging characteristics), and in particular, the case where the receiving layer is a vinyl chloride resin is preferable.

  In the present invention, commercially available binder resins can also be used. Lucidene 375CI, Lucidene 606APEF, Primal ASR PlUS S25, Primal I-2183N (above, manufactured by Rohm and Haas), Jonkrill 60J, 61J, 62J, 63J, 354J, PDX7700, PDX7641, PDX7643 (manufactured by BASF), Vironal MD-1500, MD-2000 (manufactured by Toyobo), Polyester WR-905S20WO, WR-961 (manufactured by Nippon Synthetic Chemical) Plus Coat Z-690, Z-687 (above, manufactured by Kyoyo Chemical Industry Co., Ltd.), Pateracol IJ-150R, RSI-001, RSI-017 (above, manufactured by DIC Corporation), Superflex 130 (above, Daiichi Kogyo Seiyaku Co., Ltd.) And the like are preferable.

  In the present invention, the back layer coating solution is preferably prepared as an ink containing a binder resin and a film-forming aid. The film-forming aids include isopropyl alcohol, 2-butanol, methyl cellosolve, ethyl cellosolve, butyl cellosolve, butyl cellosolve and other cellosolves, carbitol (diethylene glycol monoalkyl ether), solfit, polypropylene glycol monomethyl ether, propylene glycol monoethyl Those containing at least one selected from the group consisting of ether acetate, texanol, and N-methyl-2-pyrrolidone are preferred. By using a binder resin and a film-forming aid in combination, a binder resin having a high glass transition temperature (eg, 70 ° C. or higher) with good blocking resistance is used without being mixed with a water-soluble resin or a resin having a low glass transition temperature. can do. In addition, the film-forming aid remaining in the back layer also functions as a compatibilizer with the backprint ink, and can improve the backprint suitability and the like.

  The back layer may further contain a friction modifier, and the friction modifier may contain silica particles. Silica particles having an average particle diameter of 1 to 10 μm are preferable. The average particle diameter of silica can be measured by a conventionally known method such as a coal counter method. If the average particle size is in the above range, blocking and powder falling can be prevented, and good backprint suitability can be imparted. The content of the friction modifier in the back layer is preferably 20% by mass or less, more preferably 0.5 to 20% by mass, based on the total solid content of the binder resin in the back layer. More preferably, it is 1-15 mass%, Most preferably, it is 1-5 mass%. When the content of the silica particles is in the above range, the scratching property of the receiving layer can be suppressed, and the friction coefficient of the back layer can be adjusted appropriately. In addition, scratch resistance, backprint suitability, and blocking resistance can be improved.

  In the present invention, commercially available silica particles can also be used. Sicilia 380 (manufactured by Fuji Silysia Chemical Ltd.), NIPGEL AY-200, NIPGEL CX-400, NIPGEL CX-200, NIPGEL AZ-6A0, NIPGEL AY- 451, NIPGEL BY-601 (above, manufactured by Tosoh Silica Co., Ltd.) and the like are preferable.

  As the antistatic agent contained in the back layer, it is preferable to use a conductive synthetic layered silicate. The conductive synthetic layered silicate is a synthetic product obtained by reacting sodium, magnesium, and lithium salts with sodium silicate under appropriate conditions. By containing the layered silicate in the back surface layer, it is possible to control the chargeability of the back surface of the thermal transfer image-receiving sheet and further improve the dispersibility. Moreover, content of layered silicate becomes like this. Preferably it is 0.5-20 mass% with respect to the total solid content mass of a back surface layer, More preferably, it is 0.5-15 mass%. When the content of the layered silicate is within the above range, it is preferable without impairing the original function of the back layer. Moreover, it is preferable that the average particle diameter of a layered silicate is 30 nm or less. In the present invention, a commercially available layered silicate can be used, and for example, Laponite JS, Laponite S (manufactured by Wilber Ellis Co., Ltd.) 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 coating amount is in the above range, sufficient back print suitability can be obtained.

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 preferably formed by a water-based coating method, and its constituent components are not particularly limited. According to a preferred embodiment, the receiving layer can contain a binder resin, 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 / acrylic copolymers, vinyl chloride / vinyl acetate copolymers (vinyl chloride-based). Resin), 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, ethylene and propylene, etc. Examples thereof include copolymer resins of olefins and other vinyl monomers, cellulose resins such as ionomers and cellulose diacetates, polycarbonates and the like, and mixed systems of these resins. Particularly preferred are vinyl chloride resins.

  Examples of the release agent contained in the receiving layer include silicone oil (including reaction-curable silicone), phosphate ester plasticizers, and fluorine compounds, 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 release agent in which the modified silicone is dispersed in water. Two or more kinds of water-dispersed release agents of modified silicone may be used, or may be used in combination with other release agents. In the present invention, a commercially available release agent may be used, and X22-3000T (manufactured by Shin-Etsu Chemical Co., Ltd.) or the like may be used after being dispersed in water. Use of such an epoxy-modified silicone is preferable from the viewpoint of combination with the binder resin.

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 hollow layer, a primer layer, an intermediate layer, and a release layer on the receiving layer side.

Hollow layer The hollow layer in the present invention has a heat insulating property 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 hollow layer contains hollow particles and may further contain a hydrophilic binder and other additives. According to a preferred embodiment, the hollow layer may be composed of two or more layers. A hollow layer is provided with cushioning properties by including hollow particles. Here, the degree of cushioning property of the hollow layer can be appropriately adjusted according to the application of the thermal transfer image receiving sheet. The degree of cushioning property of the hollow layer can also be adjusted to an arbitrary range by changing the thickness of the hollow layer, for example. The thickness of the hollow 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 preferably in the range of 10 μm to 100 μm, and in the range of 10 μm to 50 μm. More preferably, it is within. The density of the hollow 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 insulation and cushioning properties can be imparted to the hollow 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 hollow 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 insulation and cushioning properties can be imparted to the hollow 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, Ropeke HP-1055, Ropeke HP-91, Ropeke OP-84J, Ropeke Ultra and Ropeke SE (manufactured by Rohm and Haas Co., Ltd.), Nipol MH-5055 (Nippon Zeon Corporation), SX8782 and SX866 (JSR Corporation) are preferred.

Primer layer The primer layer in the present invention has a role of satisfactorily adhering the hollow layer and the receiving layer, and prevents image migration to the hollow layer side in a high-temperature and high-humidity environment, thereby improving image storage stability. It has a function. 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 hollow layer or primer layer described above includes gelatin and derivatives thereof, polyvinyl alcohol, polyethylene oxyside, polyvinyl pyrrolidone, pullulan, carboxymethyl cellulose, hydroxyethyl cellulose, Examples include dextran, dextrin, polyacrylic acid and salts thereof, agar, κ-carrageenan, λ-carrageenan, ι-carrageenan, casein, xanthene gum, locust bean gum, alginic acid, and gum arabic, with gelatin being particularly 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, by using gelatin, the viscosity of each coating solution can be adjusted to a desired range, and a desired film thickness can be obtained. In the present invention, commercially available gelatin can also be used. For example, RR, R, CLV, and N1236 (manufactured by Nitta Gelatin Co., Ltd.) are preferable.

Intermediate Layer In the present invention, at least one intermediate layer may be provided between the hollow 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.

Method for producing thermal transfer image-receiving sheet The method for producing a thermal transfer image-receiving sheet of the present invention comprises a substrate, a receiving layer on one surface of the substrate, and a back layer on the surface opposite to the receiving layer of the substrate. A method for producing a thermal transfer image-receiving sheet, comprising a step of forming a back surface layer using a back surface layer coating liquid comprising a binder resin and colloidal silica having an average particle diameter of 20 to 500 nm. It will be. 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 hollow 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.

  In the present invention, when the back layer is formed by aqueous coating, a binder resin and colloidal silica are used in combination with the back layer coating solution, and a film-forming aid is added as desired, for example, 50 ° C. or higher, preferably Productivity can be improved by drying at 80 ° C. to 150 ° C., and an appropriate film-forming state can be formed. Therefore, adhesion, blocking resistance, and backprint suitability are improved.

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 a red dye, MS Red G (manufactured by Mitsui Toatsu Chemical Co., Ltd.), Macrolex Red Violet R (manufactured by Bayer), CeresRed 7B (manufactured by Bayer), Samalon Red F3BS (manufactured by Mitsubishi Chemical), etc. are yellow. Examples of the dye include Holon Brilliant Yellow 6GL (manufactured by Clariant), PTY-52 (manufactured by Mitsubishi Kasei Co., Ltd.), Macrolex Yellow 6G (manufactured by Bayer), etc., and examples of the blue dye include Kayaset Blue 714 (Nippon Kayaku) Manufactured), Waxoline Blue AP-FW (manufactured by ICI), Holon Brilliant Blue SR (manufactured by Sand), MS Blue 100 (manufactured by Mitsui Toatsu Chemicals) and the like. In addition, the dye contained in the ink ribbon used by the commercially available sublimation type thermal transfer system can also be used.

  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 (dissolved solution or dispersion) is applied to one surface of a substrate sheet by, for example, a gravure printing method, a reverse roll coating method using a gravure plate, a roll coater, a bar coater, etc., and dried. Can be formed. 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 prepared by adding the above-mentioned heat-resistant resin and the above-mentioned slipperiness-imparting agent and additives that are optionally added to the solvent, and dissolving or dispersing each component to form a heat-resistant slipping layer coating solution. After the preparation, the heat resistant slipping layer coating solution can be applied on a substrate and dried. As the solvent in the heat resistant slipping layer coating solution, the same solvents as those 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.

  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 mass part of description described was described with the compounding ratio, and diluted with the pure water as needed.

Example 1
RC paper (manufactured by Mitsubishi Paper Industries Co., Ltd.) is used as a base material for producing the thermal transfer image-receiving sheet 1. It was applied so as to be 0.8 g / m ² and dried at 120 ° C. for 30 seconds. In addition, the coating liquid was appropriately diluted and blended so that no agglomerates were generated when blended, and the total solid content was appropriately selected according to the coating conditions.

Composition of back surface coating solution 1 Binder resin (styrene / acrylic resin, emulsion, Tg = 11 ° C., manufactured by Rohm & Haas Co., Ltd., trade name: Lucidene 606APEF: solid content 47%) 50 parts by mass / pure Water 67 parts by mass Binder resin (styrene / acrylic resin, emulsion, Tg = 100 ° C., manufactured by Rohm and Haas Co., Ltd., trade name: Lucidene 375CI: solid content 46%) 50 parts by mass Pure water 65 parts by mass Colloidal silica (average particle size: 20-30 nm (BET method), manufactured by ADEKA Corporation, trade name: Adelite AT-50: solid content 48%) 290 parts by mass Pure water 406 parts by mass

Subsequently, the coating liquid 1 for the hollow layer A, the coating liquid 1 for the hollow layer B, the coating liquid 1 for the primer layer, and the coating liquid 1 for the receiving layer having the following composition are respectively heated to 40 ° C. Using the coating, the thickness at the time of WET is 15 μm, 25 μm, 15 μm, and 8 μm, respectively, cooled at 5 ° C. for 30 seconds, dried at 50 ° C. for 2 minutes, and heat-transfer image-receiving sheet 1 (layer Structure: Back layer / base material / hollow layer A / hollow layer B / primer layer / receiving layer) was obtained. The coating speed was 100 m / min. This thermal transfer image-receiving sheet had a layer structure as shown in FIG.
Composition of hollow layer A coating solution 1 (for lower layer) Hollow particles (average particle size: 0.5 μm, average hollowness: 45%, manufactured by Rohm and Haas Co., Ltd., trade name: Ropeke Ultra: solid 30%) 276 parts by weight Gelatin (made by Nitta Gelatin Co., Ltd., trade name: N1236) 27 parts by weight 600 parts by weight pure water Binder resin (styrene / acrylic resin, made by Shin-Nakamura Chemical Co., Ltd.) Product name: New Coat B-13: Solid content 42%) 32.8 parts by mass / pure water 13.2 parts by mass / binder resin (styrene / acrylic resin, manufactured by BASF Japan Ltd., product name: Jonkrill 62J: (Solid content 34%) 40.6 parts by mass / pure water 14.6 parts by mass
Composition of hollow layer B coating solution 1 (for upper layer) Hollow particles (average particle size: 0.5 μm, average hollowness: 45%, manufactured by Rohm & Haas Co., Ltd., trade name: Ropeque Ultra: solid 30%) 447 parts by weight gelatin (Nitta Gelatin Co., Ltd., trade name: N1236) 40 parts by weight pure water 433 parts by weight binder resin (styrene / acrylic resin, manufactured by Shin-Nakamura Chemical Co., Ltd.) Product name: New Coat B-13: Solid content 42%) 23.8 parts by mass, 9.5 parts by mass of pure water, binder resin (styrene / acrylic resin, manufactured by BASF Japan Ltd., product name: Jonkrill 62J: Solid content 34%) 47 parts by mass / pure water 17 parts by mass / surfactant (sodium dioctylsulfosuccinate aqueous solution: solid content 20%) 2 parts by mass
Composition of primer layer coating solution 1 Cross-linked hollow particles (average particle size: 0.1 μm, average hollow ratio: 30%, manufactured by JSR Corporation, trade name: SX866, solid content: 20%) 658 parts by mass Gelatin (Trade name: N1236, manufactured by Nitta Gelatin Co., Ltd.) 44 parts by mass, 422 parts by mass of pure water, binder resin (styrene / acrylic resin, manufactured by BASF Japan Ltd., product name: Jonkrill 62J: solid content 34% ) 17.7 parts by mass / pure water 6.4 parts by mass / binder resin (modified rubber, manufactured by Resex Corp., trade name MG-67: solid content 51%) 18.6 parts by mass / surfactant (dioctylsulfosucci) Sodium acid aqueous solution: solid content 20%) 2 parts by mass
Composition of coating solution 1 for receiving layer / vinyl acetate emulsion (vinyl chloride / vinyl acetate = 97.5 / 2.5): solid content 36%)
411 parts by mass-Aqueous dispersion of release agent (solid content: 17%) 98 parts by mass-Epoxy crosslinking agent (manufactured by Nagase Chemtex Co., Ltd., trade name EX-512: solid content 100%) 7.6 parts by mass -11.4 parts by mass of pure water-Thickener (manufactured by ADEKA, trade name Adecanol UH-526: solid content 30%)
45 parts by mass, 230 parts by mass of pure water, 23 parts by mass of a surfactant (sodium dioctylsulfosuccinate aqueous solution: solid content 20%)

Preparation of vinyl chloride-based emulsion The vinyl chloride- based resin latex used in the receiving layer coating solution 1 was prepared as follows. In a 2.5 L autoclave, 600 g of deionized water, 438.8 g of vinyl chloride monomer (97.5% by mass with respect to all charged monomers) and 11.2 g of vinyl acetate (2% with respect to all charged monomers) .5 mass%) and 2.25 g of potassium persulfate were charged. The reaction mixture was stirred with a stirring blade so as to maintain a rotation speed of 120 rpm, and the temperature of the reaction mixture was raised to 60 ° C. to initiate polymerization. 180 g of a 5% by mass aqueous sodium dodecylbenzenesulfonate solution (2% by mass with respect to all charged monomers) was continuously added until after the start of polymerization until 4 hours, and the saturated vapor pressure of the vinyl chloride monomer at a polymerization pressure of 60 ° C. The polymerization was stopped when the pressure dropped from 0.6 MPa to a residual monomer, and a vinyl acetate resin latex was obtained.

Preparation of Release Agent Aqueous Dispersion The release agent aqueous dispersion used in the receiving layer coating solution 1 was prepared as follows. 16 g of epoxy-modified silicone (trade name X-22-3000T manufactured by Shin-Etsu Chemical Co., Ltd.) and 8 g of aralkyl-modified silicone (trade name X-24-510 manufactured by Shin-Etsu Chemical Co., Ltd.) are dissolved in 85 g of ethyl acetate. A solvent-based solution was prepared. Next, 14 g of triisopropyl naphthalene sulfonic acid sodium salt (solid content: 10%) was dissolved in 110 g of pure water to prepare an aqueous solution. Subsequently, the solvent-based solution and the aqueous solution were mixed and stirred, and then dispersed using a homogenizer to prepare a dispersion. Thereafter, ethyl acetate was removed under reduced pressure while heating the dispersion to 30 to 60 ° C. to obtain an aqueous dispersion of silicone.

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 the back surface layer was as follows.
Composition of back surface coating solution 2 Binder resin (styrene / acrylic resin, emulsion, Tg = 11 ° C., manufactured by Rohm & Haas Co., Ltd., trade name: Luciden 606APEF: solid content 47%) 50 parts by mass / pure Water 67 parts by mass Binder resin (styrene / acrylic resin, emulsion, Tg = 100 ° C., manufactured by Rohm and Haas Co., Ltd., trade name: Lucidene 375CI: solid content 46%) 50 parts by mass Pure water 65 parts by mass Colloidal silica (average particle size: 20-30 nm (BET method), manufactured by Nissan Chemical Industries, Ltd., trade name: Snowtex 50: solid content 48%) 290 parts by mass

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 the back surface layer was as follows.
Composition of back surface coating solution 3 Binder resin (styrene / acrylic resin, emulsion, Tg = 11 ° C., manufactured by Rohm & Haas Co., Ltd., trade name: Luciden 606APEF: solid content 47%) 50 parts by mass / pure Water 67 parts by mass Binder resin (styrene / acrylic resin, emulsion, Tg = 100 ° C., manufactured by Rohm and Haas Co., Ltd., trade name: Lucidene 375CI: solid content 46%) 50 parts by mass Pure water 65 parts by mass Colloidal silica (average particle size: 80 to 120 nm (dynamic light scattering method), manufactured by Nissan Chemical Industries, Ltd., trade name: Snowtex PS-S: solid content 20%) 696 parts by mass

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 the back surface layer was as follows.
Composition of back surface coating solution 4 Binder resin (styrene / acrylic resin, emulsion, Tg = 11 ° C., manufactured by Rohm & Haas Co., Ltd., trade name: Lucidene 606APEF: solid content 47%) 50 parts by mass / pure Water 67 parts by mass Binder resin (styrene / acrylic resin, emulsion, Tg = 100 ° C., manufactured by Rohm and Haas Co., Ltd., trade name: Lucidene 375CI: solid content 46%) 50 parts by mass Pure water 65 parts by mass Colloidal silica (average particle size: 40-50 nm (BET method), manufactured by Nissan Chemical Industries, Ltd., trade name: Snowtex 20L: solid content 20%) 696 parts by mass

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 the back surface layer was as follows, and the coating amount after drying was 0.5 g / m2.
Composition of back surface coating solution 5 Binder resin (styrene / acrylic resin, emulsion, Tg = 11 ° C., manufactured by Rohm & Haas Co., Ltd., trade name: Lucidene 606APEF: solid content 47%) 50 parts by mass / pure Water 67 parts by mass Binder resin (styrene / acrylic resin, emulsion, Tg = 100 ° C., manufactured by Rohm and Haas Co., Ltd., trade name: Lucidene 375CI: solid content 46%) 50 parts by mass Pure water 65 parts by mass Colloidal silica (average particle size: 80 to 120 nm (dynamic light scattering method), manufactured by Nissan Chemical Industries, Ltd., trade name: Snowtex PS-S: solid content 20%) 696 parts by mass

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 the back surface layer was as follows.
Composition of back surface coating solution 6 Binder resin (styrene / acrylic resin, emulsion, Tg = 11 ° C., manufactured by Rohm & Haas Co., Ltd., trade name: Lucidene 606APEF: solid content 47%) 50 parts by mass / pure Water 67 parts by mass Binder resin (styrene / acrylic resin, emulsion, Tg = 100 ° C., manufactured by Rohm and Haas Co., Ltd., trade name: Lucidene 375CI: solid content 46%) 50 parts by mass Pure water 65 parts by mass Colloidal silica (average particle size: 80 to 120 nm (dynamic light scattering method), manufactured by Nissan Chemical Industries, Ltd., trade name: Snowtex PS-S: solid content 20%) 232 parts by mass

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 the back surface layer was as follows.
Composition of back surface coating solution 7 Binder resin (styrene / acrylic resin, emulsion, Tg = 11 ° C., manufactured by Rohm & Haas Co., Ltd., trade name: Lucidene 606APEF: solid content 47%) 50 parts by mass / pure Water 67 parts by mass Binder resin (styrene / acrylic resin, emulsion, Tg = 100 ° C., manufactured by Rohm and Haas Co., Ltd., trade name: Lucidene 375CI: solid content 46%) 50 parts by mass Pure water 65 parts by mass Colloidal silica (average particle size: 80 to 120 nm (dynamic light scattering method), manufactured by Nissan Chemical Industries, Ltd., trade name: Snowtex PS-S: solid content 20%) 464 parts by mass

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 composition of the coating solution for the back layer was as follows.
Composition of back surface coating solution 8 Binder resin (styrene / acrylic resin, emulsion, Tg = 11 ° C., manufactured by Rohm & Haas Co., Ltd., trade name: Lucidene 606APEF: solid content 47%) 50 parts by mass / pure Water 67 parts by mass Binder resin (styrene / acrylic resin, emulsion, Tg = 100 ° C., manufactured by Rohm and Haas Co., Ltd., trade name: Lucidene 375CI: solid content 46%) 50 parts by mass Pure water 65 parts by mass Colloidal silica (average particle size: 80 to 120 nm (dynamic light scattering method), manufactured by Nissan Chemical Industries, Ltd., trade name: Snowtex PS-S: solid content 20%) 1392 parts by mass

Example 9
Production of thermal transfer image receiving sheet 9 A thermal transfer image receiving sheet 9 was produced in the same manner as in Example 1 except that the composition of the coating solution for the back surface layer was as follows.
Composition of back surface layer coating solution 9・ Binder resin (polyester resin, emulsion, film-forming auxiliary (n-butyl cellosolve) contained, Tg = 77 ° C. (DSC method), manufactured by Toyobo Co., Ltd., trade name: Bironal MD1500: Solid content 30%) 100 parts by mass, 50 parts by mass of pure water, colloidal silica (average particle size: 80-120 nm (dynamic light scattering method), manufactured by Nissan Chemical Industries, Ltd., trade name: Snowtex PS-S: 450 mass parts)

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 the back surface layer was as follows.
Composition of backside layer coating solution 10 Binder resin (polyester resin, emulsion, Tg = 110 ° C. (DSC method), manufactured by Kyoyo Chemical Industry Co., Ltd., trade name: Pluscoat Z687: solid content 25%) 80 parts by mass 20 parts by mass of pure water, colloidal silica (average particle size: 80 to 120 nm (dynamic light scattering method), manufactured by Nissan Chemical Industries, Ltd., trade name: Snowtex PS-S: solid content 20%) 300 parts by mass

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 the back surface layer was as follows.
Composition of back surface coating solution 11 -Binder resin (polyester resin, emulsion, film-forming auxiliary (t-butylcellosolve) contained, Tg = 110 ° C (DSC method), manufactured by Kyoyo Chemical Industry Co., Ltd., trade name: Plus Coat Z690: solid content 25%) 100 parts by mass, pure water 20 parts by mass, colloidal silica (average particle size: 80 to 120 nm (dynamic light scattering method), manufactured by Nissan Chemical Industries, Ltd., trade name: Snowtex PS- S: Solid content 20%) 300 parts by mass

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 the back surface layer was as follows.
Composition of back surface layer coating liquid 12 Binder resin (polyester resin, emulsion, Tg = 110 ° C. (DSC method), manufactured by Kyoyo Chemical Industry Co., Ltd., trade name: Pluscoat Z687: solid content 25%) 72 parts by mass 18 parts by mass of pure water / binder resin (polyvinyl butyral resin, manufactured by Sekisui Chemical Co., Ltd., trade name: KW-1: solid content: 20%) 10 parts by mass / colloidal silica (average particle size: 80 to 120 nm (dynamic) Light scattering method), manufactured by Nissan Chemical Industries, Ltd., trade name: Snowtex PS-S: solid content 20%) 300 parts by mass

Example 13
Production of thermal transfer image receiving sheet 13 A thermal transfer image receiving sheet 13 was produced in the same manner as in Example 1 except that the composition of the coating solution for the back surface layer was as follows.
Composition of back surface coating solution 13 Binder resin (styrene / acrylic resin, emulsion, Tg = 11 ° C., manufactured by Rohm & Haas Co., Ltd., trade name: Lucidene 606APEF: solid content 47%) 50 parts by mass / pure Water 67 parts by mass Binder resin (styrene / acrylic resin, emulsion, Tg = 100 ° C., manufactured by Rohm and Haas Co., Ltd., trade name: Lucidene 375CI: solid content 46%) 50 parts by mass Pure water 65 parts by mass Colloidal silica (average particle size: 20-30 nm (BET method), manufactured by ADEKA Corporation, trade name: Adelite AT-50: solid content 48%) 145 parts by mass Pure water 203 parts by mass Colloidal silica (average particle Diameter: 80 to 120 nm (dynamic light scattering method), manufactured by Nissan Chemical Industries, Ltd., trade name: Snowtex PS-S: solid content 20%) 34 8 parts by mass

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 the back layer was as follows.
Composition of back surface coating solution 14 Binder resin (styrene / acrylic resin, emulsion, Tg = 11 ° C., manufactured by Rohm & Haas Co., Ltd., trade name: Luciden 606APEF: solid content 47%) 50 parts by mass / pure Water 67 parts by mass Binder resin (styrene / acrylic resin, emulsion, Tg = 100 ° C., manufactured by Rohm and Haas Co., Ltd., trade name: Lucidene 375CI: solid content 46%) 50 parts by mass Pure water 65 parts by mass Colloidal silica (average particle size: 20-30 nm (BET method), manufactured by ADEKA, trade name: Adelite AT-50) 145 parts by mass 203 parts by mass of pure water Colloidal silica (average particle size: 80-120 nm (Dynamic light scattering method), manufactured by Nissan Chemical Industries, Ltd., trade name: Snowtex PS-S: solid content 20%) 348 parts by mass Ka particle (average particle size: 4.0 μm, manufactured by Tosoh Silica Co., Ltd., trade name: NIPGEL CX-400) 12 parts by mass / antistatic agent (conductive synthetic layered silicate, manufactured by Wilber Ellis Co., Ltd., Product name: LAPONITE JS) 12 parts by mass

Example 15
Production of thermal transfer image receiving sheet 15 A thermal transfer image receiving sheet 15 was produced in the same manner as in Example 1 except that the composition of the coating solution for the back surface layer was as follows.
Composition of back surface coating solution 15 Binder resin (styrene / acrylic resin, emulsion, Tg = 11 ° C., manufactured by Rohm & Haas Co., Ltd., trade name: Lucidene 606APEF: solid content 47%) 50 parts by mass / pure Water 67 parts by mass Binder resin (styrene / acrylic resin, emulsion, Tg = 100 ° C., manufactured by Rohm and Haas Co., Ltd., trade name: Lucidene 375CI: solid content 46%) 50 parts by mass Pure water 65 parts by mass Colloidal silica (average particle size: 200 nm (centrifugation), manufactured by Nissan Chemical Industries, Ltd., trade name: Snowtex MP-2040: solid content 40%) 348 parts by mass Pure water 348 parts by mass

Example 16
Production of thermal transfer image receiving sheet 16 A thermal transfer image receiving sheet 16 was produced in the same manner as in Example 1 except that the composition of the coating solution for the back surface layer was as follows.
Composition of back surface coating solution 16 Binder resin (styrene / acrylic resin, emulsion, Tg = 11 ° C., manufactured by Rohm & Haas Co., Ltd., trade name: Luciden 606APEF: solid content 47%) 50 parts by mass / pure Water 67 parts by mass Binder resin (styrene / acrylic resin, emulsion, Tg = 100 ° C., manufactured by Rohm and Haas Co., Ltd., trade name: Lucidene 375CI: solid content 46%) 50 parts by mass Pure water 65 parts by mass Colloidal silica (average particle size: 300 nm (centrifugation), manufactured by Nissan Chemical Industries, Ltd., trade name: Snowtex MP-3040: solid content 40%) 348 parts by mass Pure water 348 parts by mass

Example 17
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 the back surface layer was as follows.
Composition of backside layer coating liquid 17 Binder resin (styrene / acrylic resin, emulsion, Tg = 11 ° C., manufactured by Rohm & Haas Co., Ltd., trade name: Lucidene 606APEF: solid content 47%) 50 parts by mass / pure Water 67 parts by mass Binder resin (styrene / acrylic resin, emulsion, Tg = 100 ° C., manufactured by Rohm and Haas Co., Ltd., trade name: Lucidene 375CI: solid content 46%) 50 parts by mass Pure water 65 parts by mass Colloidal silica (average particle size: 450 nm (centrifugation), manufactured by Nissan Chemical Industries, Ltd., trade name: Snowtex MP-4540M: solid content 40%) 348 parts by mass Pure water 348 parts by mass

Example 18
Preparation of thermal transfer image-receiving sheet 3 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 the back surface layer was as follows.
Composition of back surface coating liquid 18 Binder resin (acrylic / styrene resin, emulsion, Tg = 11 ° C., manufactured by Rohm & Haas Co., Ltd., trade name: Lucidene 606APEF: solid content 47%) 50 parts by mass Resin (acrylic / styrene resin, emulsion, Tg = 100 ° C., manufactured by Rohm & Haas Co., Ltd., trade name: Lucidene 375CI: solid content 46%) 50 parts by mass / colloidal silica (average particle size: 20-30 nm ( BET method), manufactured by ADEKA Corporation, trade name: Adelite AT-50: solid content 48%) 290 parts by mass, silica particles (average particle diameter: 4.0 μm, manufactured by Tosoh Silica Corporation, trade name: NIPEGLCX -400) 5.6 parts by mass / pure water 562 parts by mass

Example 19
Preparation of thermal transfer image receiving sheet 19 A thermal transfer image receiving sheet 19 was prepared in the same manner as in Example 1 except that the composition of the coating solution for the back layer was as follows.
Composition of back surface coating liquid 19 -Binder resin (polyester resin, emulsion, film-forming auxiliary (n-butyl cellosolve) contained, Tg = 77 ° C (DSC method), manufactured by Toyobo Co., Ltd., trade name: Bironal MD1500: Solid content 30%) 100 parts by mass Colloidal silica (average particle size: 20-30 nm, manufactured by ADEKA Corporation, trade name: Adelite AT-50: solid content 48%) 188 parts by mass Silica particles (average particle size: 4.0 μm, manufactured by Tosoh Silica Co., Ltd., trade name: NIPEGLCX-400) 3.6 parts by mass / 344 parts by mass of pure water

Example 20
Production of thermal transfer image receiving sheet 20 A thermal transfer image receiving sheet 20 was produced in the same manner as in Example 1 except that the composition of the coating solution for the back surface layer was as follows.
Composition of back surface coating solution 20 Binder resin (polyester resin, emulsion, film-forming auxiliary (t-butyl cellosolve) contained, Tg = 110 ° C. (DSC method), manufactured by Kyoyo Chemical Industry Co., Ltd., trade name: plus coat Z690: Solid content 25%) 100 parts by mass, colloidal silica (average particle size: 20-30 nm, manufactured by ADEKA, trade name: Adelite AT-50: solid content 48%) 156 parts by mass, silica particles (average particle Diameter: 4.0 μm, manufactured by Tosoh Silica Co., Ltd., trade name: NIPGEL CX-400) 3 parts by mass / 256 parts by mass of pure water

Example 21
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 the back surface layer was as follows.
Composition of backside layer coating liquid 21 Binder resin (polyester resin, emulsion, Tg = 110 ° C. (DSC method), manufactured by Kyoyo Chemical Industry Co., Ltd., trade name: Pluscoat Z687: solid content 25%) 100 parts by mass Colloidal silica (average particle size: 20-30 nm, manufactured by ADEKA Corporation, trade name: Adelite AT-50: solid content 48%) 156 parts by mass, silica particles (average particle size: 4.0 μm, Tosoh Silica Co., Ltd.) Product name: NIPGELCX-400) 3 parts by mass / 256 parts by mass of pure water

Example 22
Preparation of thermal transfer image receiving sheet 22 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 the back surface layer was as follows.
Composition of coating liquid 22 for back layer / binder resin (polyurethane resin, emulsion, film-forming auxiliary (N-methyl-2-pyrrolidone) contained, Tg = 101 ° C. (dynamic viscoelasticity measuring method), Daiichi Kogyo Seiyaku ( Co., Ltd., trade name: Superflex 130: solid content 30%) 100 parts by mass, colloidal silica (average particle size: 20-30 nm, manufactured by ADEKA, trade name: Adelite AT-50: solid content 48%) 188 parts by mass / silica particles (average particle size: 4.0 μm, manufactured by Tosoh Silica Co., Ltd., trade name: NIPGEL CX-400) 3.6 parts by mass / 344 parts by mass of pure water

Example 23
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 the back surface layer was as follows.
Composition of back surface layer coating solution 23 Binder resin (polyester resin, emulsion, Tg = 110 ° C. (DSC method), manufactured by Kyoyo Chemical Industry Co., Ltd., trade name: Pluscoat Z687: solid content 25%) 90 parts by mass Binder resin (polyvinyl butyral resin, water-soluble, Tg = 80 ° C., manufactured by Sekisui Chemical Co., Ltd., trade name: ESREC KW-1: solid content 20%) 12.5 parts by mass / colloidal silica (average particle size: 20 ˜30 nm, manufactured by ADEKA Corporation, trade name: Adelite AT-50: solid content 48%) 156 parts by mass, silica particles (average particle size: 4.0 μm, manufactured by Tosoh Silica Corporation, trade name: NIPGEL CX -400) 3 parts by mass / 254 parts by mass of pure water

Example 24
Production of thermal transfer image receiving sheet 24 A thermal transfer image receiving sheet 24 was produced in the same manner as in Example 1 except that the composition of the coating solution for the back surface layer was as follows.
Composition of the coating solution 24 for the back layer / binder resin (acrylic / styrene resin, emulsion, Tg = 11 ° C., manufactured by Rohm & Haas Co., Ltd., trade name: Lucidene 606APEF: solid content 47%) 42.6 parts by mass Binder resin (acrylic / styrene resin, emulsion, Tg = 100 ° C., manufactured by Rohm & Haas Co., Ltd., trade name: Luciden 375CI: solid content 46%) 10.9 parts by mass Colloidal silica (average particle diameter: 20-30 nm, manufactured by ADEKA Corporation, trade name: Adelite AT-50: solid content 48%) 156 parts by mass, silica particles (average particle size: 4.0 μm, manufactured by Tosoh Silica Corporation, trade name: NIPGEL CX-400) 3 parts by mass / 303 parts by mass of pure water

Example 25
Production of thermal transfer image receiving sheet 25 A thermal transfer image receiving sheet 25 was produced in the same manner as in Example 1 except that the composition of the coating solution for the back surface layer was as follows.
Composition of backside layer coating liquid 25 Binder resin (acrylic / styrene resin, emulsion, Tg = 11 ° C., manufactured by Rohm and Haas Co., Ltd., trade name: Lucidene 606APEF: solid content 47%) 10.6 parts by mass Binder resin (acrylic / styrene resin, emulsion, Tg = 100 ° C., manufactured by Rohm & Haas Co., Ltd., trade name: Luciden 375CI solid content 46%) 43.4 parts by mass Colloidal silica (average particle size: 20 ˜30 nm, manufactured by ADEKA Corporation, trade name: Adelite AT-50, 156 parts by mass, silica particles (average particle size: 4.0 μm, manufactured by Tosoh Silica Corporation, trade name: NIPGEL CX-400) 3 mass Part ・ Pure water 302 parts by mass

Comparative Example 1
Production of thermal transfer image receiving sheet 26 A thermal transfer image receiving sheet 26 was produced in the same manner as in Example 1 except that the composition of the coating solution for the back layer was as follows.
Composition of backside layer coating liquid 26 Binder resin (styrene / acrylic resin, manufactured by Rohm and Haas Co., Ltd., trade name: Luciden 606APEF: solid content 47%) 50 parts by mass Pure water 67 parts by mass Binder resin (Styrene / acrylic resin, manufactured by Rohm & Haas Co., Ltd., trade name: Lucidene 375CI: solid content 46%) 50 parts by mass / pure water 65 parts by mass / alumina (average particle size 1 μm (laser diffraction method), Sumitomo Chemical Industry Co., Ltd., trade name: AM-27) 35 parts by mass / pure water 140 parts by mass

Comparative Example 2
Production of thermal transfer image receiving sheet 27 A thermal transfer image receiving sheet 27 was produced in the same manner as in Example 1 except that the composition of the coating solution for the back surface layer was as follows.
Composition of backside layer coating liquid 27 Binder resin (styrene / acrylic resin, manufactured by Rohm & Haas Co., Ltd., trade name: Luciden 606APEF: solid content 47%) 50 parts by mass Pure water 67 parts by mass Binder resin (Styrene / acrylic resin, manufactured by Rohm and Haas Co., Ltd., trade name: Lucidene 375CI: solid content 46%) 50 parts by mass / pure water 65 parts by mass / silica particles (average particle size: 4.0 μm, Tosoh Silica Co., Ltd., trade name: NIPGELCX-400) 35 parts by mass / pure water 140 parts by mass

Comparative Example 3
Preparation of thermal transfer image receiving sheet 28 A thermal transfer image receiving sheet 28 was prepared in the same manner as in Example 1 except that the composition of the coating solution for the back surface layer was as follows.
Composition of backside layer coating liquid 28 Binder resin (styrene / acrylic resin, manufactured by Rohm & Haas Co., Ltd., trade name: Luciden 606APEF: solid content 47%) 50 parts by mass Pure water 67 parts by mass Binder resin (Styrene / acrylic resin, manufactured by Rohm and Haas Co., Ltd., trade name: Lucidene 375CI: solid content 46%) 50 parts by mass / pure water 65 parts by mass / silica particles (average particle size 9.0 μm, Fuji Silysia Chemical) Product name: Cicilia 380) 35 parts by mass, 140 parts by mass of pure water

Comparative Example 4
Preparation of thermal transfer image receiving sheet 29 A thermal transfer image receiving sheet 29 was prepared in the same manner as in Example 1 except that the composition of the coating solution for the back layer was as follows.
Composition of the back layer coating solution 29 Binder resin (styrene / acrylic resin, manufactured by Rohm & Haas Co., Ltd., trade name: Luciden 606APEF: solid content 47%) 50 parts by mass Pure water 67 parts by mass Binder resin (Styrene / acrylic resin, manufactured by Rohm & Haas Co., Ltd., trade name: Lucidene 375CI: solid content 46%) 50 parts by mass / pure water 65 parts by mass

Comparative Example 5
Production of thermal transfer image receiving sheet 30 A thermal transfer image receiving sheet 30 was produced in the same manner as in Example 1 except that the composition of the coating solution for the back surface layer was as follows.
Composition of backside layer coating solution 30 Binder resin (styrene / acrylic resin, manufactured by Rohm & Haas Co., Ltd., trade name: Luciden 606APEF: solid content 47%) 50 parts by mass Pure water 67 parts by mass Binder resin (Styrene / acrylic resin, manufactured by Rohm & Haas Co., Ltd., trade name: Lucidene 375CI: solid content 46%) 50 parts by mass, 65 parts by mass of pure water, colloidal silica (average particle size: 10 to 20 nm (BET method) , 20 nm not included), manufactured by Nissan Chemical Industries, Ltd., trade name: Snowtex C: solid content 20%) 696 parts by mass

Comparative Example 6
Production of Thermal Transfer Image Receiving Sheet 31 A thermal transfer image receiving sheet 31 was produced in the same manner as in Example 1 except that the composition of the coating solution for the back surface layer was as follows.
Composition of back surface layer coating liquid 31 Binder resin (styrene / acrylic resin, manufactured by Rohm & Haas Co., Ltd., trade name: Lucidene 606APEF: solid content 47%) 50 parts by mass Pure water 67 parts by mass Binder resin (Styrene / acrylic resin, manufactured by Rohm & Haas Co., Ltd., trade name: Lucidene 375CI: solid content 46%) 50 parts by mass, 65 parts by mass of pure water, colloidal silica (average particle size: 10 to 20 nm (BET method) , 20 nm), manufactured by Nissan Chemical Industries, Ltd., trade name: Snowtex 30: solid content 30%) 465 parts by mass / pure water 231 parts by mass

Evaluation of Thermal Transfer Image Receiving Sheets Regarding the thermal transfer image receiving sheets 1 to 31 prepared above, (1) evaluation of evaluation of the spread, (2) evaluation of scratch resistance, (3) evaluation of suitability for backprint, (4) evaluation of blocking resistance, and (5 ) The friction suitability was evaluated.

(1) Evaluation of judgment property Using the thermal transfer image-receiving sheet prepared above, 100 natural images were printed with the sublimation transfer printing system “Print Center (DNP Photolcio Co., Ltd.)”, and the prints were prepared. Ease was evaluated.
Evaluation criteria 3: Can be easily aligned and has good spreading performance.
2: It was able to arrange and the judgment property was normal.
1: It was not able to arrange, and the judgment property was unsatisfactory.

(2) Scratch resistance evaluation About the thermal transfer image receiving sheets of Examples and Comparative Examples prepared above, using the thermal transfer image receiving sheets prepared in the same Examples and Comparative Examples, the back side of the thermal transfer image receiving sheet and the other thermal transfer image receiving sheet The image-receiving sheet was rubbed against the receiving layer side, and it was visually observed whether or not the surface on the receiving layer side was scratched. The scratch resistance was evaluated according to the following evaluation criteria.
Evaluation criteria 3: The receiving layer surface was not scratched.
2: Slight scratches on the receiving layer surface.
1: Many scratches were found on the receiving layer surface.

(3) Evaluation of suitability for backprints Using the dot impact printer iDP3550 (manufactured by Citizen Systems Co., Ltd.) and a special ribbon cassette (black), test printing was performed on the back layer of the thermal transfer image-receiving sheets 1 to 20 produced above. After the predetermined time has elapsed, the receiving layer surface printed with a solid dye (tone value 38/255) with a sublimation thermal transfer printer (ALTECH ADS Co., Ltd., model: MEGAPIXELIII) and MEGAPIXELIII genuine ribbon is separately applied to the back layer. Overlap, sandwich them with a 125 μm PET film, treat with a laminator (Lamipacker LPD3204, Fuji Plastic Co., Cold mode, speed 2.5), confirm the presence or absence of transfer to the receiving layer, and evaluate according to the following three-stage criteria did. 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 3: No setback to the receiving layer occurred.
2: A slight setback to the receiving layer occurred.
1: Clearing to the receiving layer was apparent.

(4) Evaluation of blocking resistance About the thermal transfer image receiving sheets of Examples and Comparative Examples prepared above, using the thermal transfer image receiving sheets prepared in the same Examples and Comparative Examples, the other side of the thermal transfer image receiving sheet and the other side 20 kg / 105 mm × 148 mm in a state where the superposed sheet facing the receiving layer side of the thermal transfer image-receiving sheet is sandwiched between synthetic paper having a thickness of 150 μm (manufactured by YUPO Corporation, YUPO FPG # 150). After being left in an oven at 60 ° C. for 150 hours, the receiving layer surface and the back surface that were overlapped were peeled off and visually observed for occurrence of uneven printing. The blocking property 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 3: No printing unevenness occurred and no blocking occurred.
2: Print unevenness occurred slightly and blocking occurred slightly.
1: Printing unevenness occurred and blocking occurred.

(5) Evaluation of friction suitability The friction coefficient with the paper flange of sublimation type thermal transfer printer (manufactured by ALTECH ADS, model: DS40) is compared to the back layer of the thermal transfer image-receiving sheet produced above. (Tensile speed: 500 mm / min, load: 1 kg).
Evaluation criteria 3: Friction coefficient is 0.25 or more 2: Friction coefficient is 0.2 to 0.25
1: Friction coefficient is 0.2 or less

The results of the above evaluations are shown in Table 1. The thermal transfer image-receiving sheets of Examples 1 to 25 satisfying the composition of the present invention are superior in the field properties, scratch resistance, backprint suitability, and blocking resistance as compared with the thermal transfer image-receiving sheets of Comparative Examples 1 to 6. I understand.

10 Thermal transfer image-receiving sheet 11 Base material 12 Hollow layer A (lower layer)
13 Hollow layer B (upper layer)
14 Primer layer 15 Receptor layer 16 Back layer

Claims (15)

A substrate;
A receiving layer on one side of the substrate;
On the surface of the substrate opposite to the receiving layer, a back surface layer comprising a binder resin and colloidal silica,
The thermal transfer image receiving sheet whose average particle diameter of the said colloidal silica is 20-500 nm.   The thermal transfer image receiving sheet according to claim 1, wherein the back layer further comprises a friction modifier.   The thermal transfer image receiving sheet according to claim 2, wherein the friction modifier comprises silica particles.   The thermal transfer image-receiving sheet according to any one of claims 1 to 3, wherein the back layer further comprises a film-forming aid.   The film-forming aid is isopropyl alcohol, 2-butanol, methyl cellosolve, ethyl cellosolve, butyl cellosolve, butyl cellosolve, diethylene glycol monoalkyl ether, solfit, polypropylene glycol monomethyl ether, propylene glycol monoethyl ether acetate, texanol, and N- The thermal transfer image-receiving sheet according to claim 4, comprising at least one selected from the group consisting of methyl-2-pyrrolidone.   The thermal transfer image receiving sheet according to any one of claims 1 to 5, wherein the binder resin comprises a polymer latex.   The thermal transfer image-receiving sheet according to any one of claims 1 to 6, wherein the binder resin comprises an emulsion having a glass transition temperature of 70 ° C or higher.   The thermal transfer image-receiving sheet according to claim 7, wherein the binder resin comprises at least one selected from the group consisting of styrene / acrylic resins, polyester resins, polyurethane resins, and acrylic resins.   The thermal transfer image-receiving sheet according to any one of claims 1 to 8, wherein a content of the colloidal silica is 100 to 600 mass% with respect to a total solid mass of the binder resin.   The thermal transfer image-receiving sheet according to any one of claims 1 to 9, wherein the back layer contains at least two types of colloidal silica having different average particle diameters.   The thermal transfer image-receiving sheet according to any one of claims 2 to 10, wherein the content of the friction modifier is 20% by mass or less based on the total solid mass of the back layer.   The thermal transfer image-receiving sheet according to any one of claims 3 to 11, wherein an average particle diameter of the silica particles is 1 to 10 µm.   The thermal transfer image receiving sheet according to any one of claims 1 to 12, wherein the back surface layer is formed by an aqueous coating method.   The thermal transfer image receiving sheet according to claim 1, wherein the receiving layer is formed by an aqueous coating method. A method for producing a thermal transfer image-receiving sheet, comprising: a base material; a receiving layer on one surface of the base material; and a back layer on a surface opposite to the receiving layer of the base material,
The manufacturing method of the thermal transfer image receiving sheet which comprises the process of forming the said back surface layer using the coating liquid for back surface layers containing binder resin and colloidal silica which has an average particle diameter of 20-500 nm.

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