JP2014069462A - Thermal transfer image-receiving sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thermal transfer image-receiving sheet having excellent coated surface quality, capable of preventing a void at printing, and having improved heat and moisture resistance.SOLUTION: A thermal transfer image-receiving sheet 10 includes: a base material 11; and a hollow layer 12 and a reception layer 13 formed in this order on the base material. The reception layer includes a surfactant, and a layer making contact with the base material includes no surfactant.

Description

  The present invention relates to a thermal transfer image receiving sheet, and more particularly to a thermal transfer image receiving sheet comprising a base material, and a hollow layer and a receiving layer on the base material in this order.

  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, in the image receiving sheet manufacturing process, an intermediate layer is further provided between the hollow layer and the receiving layer to prevent the hollow layer from being crushed by heating during printing. However, in the conventional image receiving sheet, since this intermediate layer is formed of an organic solvent-based resin coating liquid, the coating liquid crushes bubbles and voids in the hollow layer, and a desired cushioning property is obtained. There is a problem that white spots and density unevenness occur during image formation. Therefore, in order to provide an image receiving sheet having high sensitivity and no image defects, it has been proposed that the hollow layer containing the organic hollow polymer contains an anionic surfactant and / or a nonionic surfactant ( For example, see Patent Document 1).

Japanese Patent No. 4794287

  The present invention has been made in view of the above-mentioned background art, and its purpose is to achieve thermal transfer that has excellent coating surface quality, can prevent white spots during printing (reducing coating defects), and has improved moisture resistance and heat resistance. It is to provide an image receiving sheet.

  As a result of intensive studies to solve the above problems, the present inventors have found that in the thermal transfer image-receiving sheet having a specific layer structure, the above problems can be solved by including a surfactant only in a specific layer. did. The present invention has been completed based on such findings.

That is, according to one aspect of the present invention,
A thermal transfer image receiving sheet comprising a substrate, a hollow layer, and a receiving layer in this order on the substrate,
The receptor layer comprises a surfactant;
There is provided a thermal transfer image-receiving sheet in which the layer in contact with the substrate does not contain a surfactant.

  In an embodiment of the present invention, the surfactant is at least selected from the group consisting of an anionic surfactant, a fluorosurfactant, a nonionic surfactant, a cationic surfactant, and an amphoteric surfactant. One type is preferable.

  In the aspect of the present invention, it is preferable that the hollow layer is composed of two or more layers, and the lowermost hollow layer in contact with the substrate in the two or more hollow layers does not contain a surfactant.

  In the embodiment of the present invention, it is preferable that the hollow layer is composed of two or more layers, and all of the two or more hollow layers do not contain a surfactant.

  In the embodiment of the present invention, it is preferable that a primer layer is further provided between the hollow layer and the receiving layer.

  In the embodiment of the present invention, it is preferable that the primer layer does not contain a surfactant.

  In the embodiment of the present invention, it is preferable that all the layers constituting the surface side having the receptor layer on the substrate are formed by aqueous coating.

  According to the present invention, it is possible to provide a thermal transfer image-receiving sheet that has excellent coated surface quality, can prevent white spots during printing, and has improved moisture resistance and heat resistance.

1 is a schematic cross-sectional view showing an embodiment of a thermal transfer image receiving sheet according to the present invention. It is the schematic cross section which showed other embodiment of the thermal transfer image receiving sheet by this invention.

Thermal transfer image-receiving sheet The thermal transfer image-receiving sheet of the present invention comprises a base material, a hollow layer and a receiving layer on the base material in this order. The receiving layer contains a surfactant and is in contact with the base material. The layer does not contain a surfactant. In a preferred embodiment, the thermal transfer image-receiving sheet may further have a primer layer or an intermediate layer between the hollow layer and the receiving layer, and may further have a back layer on the surface opposite to 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, there is provided a thermal transfer image receiving sheet comprising a hollow layer and a receiving layer in this order on one surface of a substrate. 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 has a base material 11 and a hollow layer 12 and a receiving layer 13 in this order on one surface of the base material 11.

  According to another aspect of the present invention, two hollow layers, a primer layer, and a receiving layer are provided in this order on one surface of the substrate, and the substrate is on the side opposite to the receiving layer. Provided is a thermal transfer image receiving sheet having a back layer on the surface. 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 20 shown in FIG. 2 includes a base material 21, a hollow layer A (lower layer) 22, a hollow layer B (upper layer) 23, a primer layer 24, and a receptor on one surface of the base material 21. The layer 25 is provided in this order. Hereinafter, each layer constituting the thermal transfer image receiving sheet of the present invention will be described.

Base material The base material in the present invention has a role of holding the hollow layer and the receiving layer, and heat is applied at the time of thermal transfer, so that it has mechanical strength that does not hinder handling even in a heated state. A material 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.

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. The hollow layer in the present invention comprises hollow particles and may further contain gelatin or an additive. 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} .

  In the present invention, the hollow layer in contact with the substrate does not contain the following surfactant. By not containing a surfactant in the layer that is in contact with the substrate (relatively lower layer), the surface tension can be made more different and difficult to mix, improving the coating surface quality, reducing coating defects, Various effects of improving heat resistance can be obtained.

  In the present invention, the hollow layer may be composed of two or more layers. When the hollow layer is composed of two or more layers, it is preferred that the lowermost hollow layer in contact with the substrate does not contain a surfactant, and all of the two or more hollow layers contain a surfactant. More preferably not.

  The average particle diameter of the hollow particles contained in the hollow layer 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. In the present invention, the volume average particle diameter of the hollow particles can be measured by a conventionally known method such as the Coulter method (Sysmex FPIA-3000 by Malvern). 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, Ropaque HP-1055, Ropaque HP-91, Ropaque OP-84J, Ropaque Ultra, Ropaque SE, Ropaque ST (manufactured by Rohm and Haas Co., Ltd.) Nipol MH-5055 (Nippon Zeon Corporation), SX8782, SX866 (JSR Corporation), and the like are preferable.

  The content of the hollow particles in the hollow layer is preferably 40 to 80% by mass, more preferably 50 to 80% by mass, and further preferably 55 to 75% by mass with respect to the total solid mass of the hollow layer. %. If the content of the hollow particles is in the above range, the heat insulating property, cushioning property and the like can be adjusted to a desired level, and further, conveyance scratches can be reduced.

  The hollow layer may further include gelatin. The gelatin content in the hollow layer is preferably 5 to 30% by mass, and more preferably 5 to 20% by mass, based on the total solid mass of the hollow layer. The gelatin is preferably alkali-treated gelatin. By containing alkali-treated gelatin, it is possible to select a combination of jelly strength and presence / absence of molecular modification, and to optimize the desired film properties. In particular, when each layer is formed by aqueous coating and simultaneous multilayer coating, the viscosity of each coating solution can be adjusted to a desired range to obtain a desired film thickness. 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.

  The hollow layer may further contain a water-soluble resin. The water-soluble resin is a resin that can be dissolved in a solvent containing water as a main component. The content of the water-soluble resin in the hollow layer is preferably 1 to 10% by mass and more preferably 2 to 8% by mass with respect to the total solid content mass of the hollow layer. In the present invention, a commercially available water-soluble resin can also be used. For example, Joncrill 62J (BASF Corp.) is preferable.

  The total content of gelatin and water-soluble resin contained in the hollow layer is 15% by mass or more, more preferably 20% or more and 40% or less, based on the total solid content contained in the hollow layer. Thereby, it is possible to suppress bleeding when the printed matter is stored in a high temperature and high humidity environment. If gelatin or a water-soluble resin having a low dyeing property is mixed with the receiving layer during coating, for example, there is a possibility that a sufficient color density cannot be obtained. However, since the present invention does not contain a surfactant in the hollow layer, mixing of the hollow layer and the receiving layer can be suppressed. Thereby, a sufficient color density 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 preferably contains a surfactant, and further contains a binder resin, a wax additive, and a urethane-associative thickener. According to a preferred embodiment, the receiving layer may contain a release agent, a surfactant or the like according to various purposes.

  The surfactant contained in the receptor layer is preferably at least one selected from the group consisting of an anionic surfactant, a fluorosurfactant, and a nonionic surfactant. Is more preferable. It is because the moisture resistance and heat resistance of the printed matter can be improved by containing these surfactants.

  Examples of the anionic surfactant include sodium dodecyl benzene sulfonate, sodium tetradecyl benzene sulfonate, di-t-butyl naphthalene sulfonate Na, triisopropyl naphthalene sulfonate Na, mononaphthalene sulfonate Na P-nonylphenoxypropyl sulfonic acid Na salt, dodecyl sulfonic acid Na salt, perfluorooctane sulfonic acid Na salt, bis-2-ethylhexylsulfosuccinic acid Na salt, dioctylsulfosuccinic acid Na salt, di (1,1,7-trihydro -Perfluoroheptyl) sulfosuccinic acid Na salt, stearic acid Na salt, 2-methyl-hexanol sulfonic acid Na salt, heptadecenylbenzimidazole sulfonic acid Na salt, N-methyloleyl tauride Na salt, N-perf Orooctylsulfonyl-N-propylglycine K salt, sorbitan lauryl monoester, alkylnaphthalenesulfonic acid Na salt, dioctylsulfonic acid Na salt, polyoxyethylene-polyoxypropylene condensate, polyoxyethylene lauryl ether sulfate Na salt, etc. Is raised. By containing these anionic surfactants, the moisture resistance and heat resistance of the printed material can be further improved. In the present invention, commercially available anionic surfactants can also be used. For example, Neocor SW-C, Neogen S-20F, Neogen AO-90, Monogen Y-100 (above, manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) Etc.) are preferred.

  Since the fluorosurfactant can realize a lower surface tension than the hydrocarbon or silicone surfactant, the wettability can be improved. Moreover, wettability can be expressed in a smaller amount. In the present invention, commercially available fluorosurfactants can also be used, and for example, Megafac F-114, F-410, F-444 (above, DIC Corporation (manufactured)) and the like are preferable.

  Nonionic surfactant is a surfactant that has a hydrophilic group that does not ionize when dissolved in water. It is not easily affected by water hardness or electrolyte, and can be used in combination with all other surfactants. -Improve dispersibility, cleanability and wettability. Nonionic surfactants are classified into ester type, ether type, ester-ether type, and others depending on the main bonding method in the molecule. In the present invention, commercially available nonionic surfactants can also be used. For example, DKS NL50, Neugen TDX-50, Neugen XL-50, Neugen TDS-50 (above, manufactured by Daiichi Kogyo Seiyaku Co., Ltd.), etc. Is preferred.

  The content of the surfactant in the receiving layer is preferably 0.1 to 10% by mass, more preferably 0.5 to 5% by mass, based on the total solid content mass of the receiving layer.

  The binder resin contained in the receiving layer is preferably a solvent-based resin having a dyeing property with a dye and / or a water-dispersible resin. The solvent-based resin is a resin that dissolves in an organic solvent such as toluene or methyl ethyl ketone. The water dispersible resin is a resin dispersible in a solvent containing water as a main component. Examples of such resins include acrylic resins, vinyl chloride resins, polyolefin resins such as polyethylene and polypropylene, polyvinyl chloride, vinyl chloride / vinyl acetate copolymers (vinyl chloride resin), polyvinylidene chloride, and the like. Halogenated polymers, vinyl polymers such as polyvinyl acetate and polyacrylates, polyester resins such as polyethylene terephthalate and polybutylene terephthalate, polystyrene resins, polyamide resins, olefins such as ethylene and propylene, and other vinyl monomers Examples thereof include cellulose resins such as copolymer resins, ionomers and cellulose diacetates, and polycarbonates. In particular, it is preferable to use at least one selected from the group consisting of a vinyl chloride resin, a polyester resin, and an acrylic resin.

  The content of the binder resin contained in the receiving layer is 60% by mass or more, preferably 65% by mass or more and 90% by mass or less, based on the total solid content of the receiving layer. Thereby, a sufficient color density can be obtained. If the binder resin of the receiving layer is mixed with a layer containing a large amount of gelatin or water-soluble resin at the time of coating, for example, there may be a problem of bleeding. However, since the present invention includes a surfactant in the receiving layer, mixing of these layers and the receiving layer can be suppressed. As a result, the problem of bleeding can be reduced.

  Examples of the wax additive contained in the receiving layer include carnauba wax and paraffin wax, and these may be used alone or in combination. In the present invention, the carnauba wax includes natural carnauba wax and purified products and derivatives thereof, including those modified with additives and the like. According to a preferred embodiment, the melting point of carnauba wax is 80 to 90 ° C., the acid value is 10 mg · KOH / g or less, and the saponification value is 78 to 88 mg · KOH / g. The paraffin wax includes natural paraffin wax and purified products and derivatives thereof, and those modified with additives and the like. The melting point of the paraffin wax is preferably 40 to 105 ° C, more preferably 40 to 90 ° C, and further preferably 40 to 75 ° C.

  As the wax additive, an emulsion type in which carnauba wax and paraffin wax are emulsified with an emulsifier may be used, and a known method can be used as an emulsification method. In the present invention, it is preferable to use a mixture of carnauba wax and paraffin wax as the wax additive, which can improve the stability of the receiving layer coating solution and improve the productivity in the production process. The mixing ratio of carnauba wax and paraffin wax is preferably 1: 0.1 to 1: 5, more preferably 1: 0.5 to 1: 2. When the mixing ratio is in the above range, the stability of the receiving layer coating solution can be further improved. Further, the total content of carnauba wax and paraffin wax in the receiving layer is preferably 1 to 50% by mass, more preferably 1 to 30% by mass, and still more preferably 5 to 20% with respect to the solid content mass of the binder resin. % By mass. When the total content of carnauba wax and paraffin wax is in the above range, the stability of the receiving layer coating solution can be further improved. In the present invention, a commercially available wax additive may be used, and for example, Q526 (a 1: 1 mixture of carnauba wax and paraffin wax, manufactured by Chukyo Yushi Co., Ltd.) is preferable.

The urethane associative thickener contained in the receiving layer has a viscosity when measured at a liquid temperature of 25 ° C. according to JIS Z8803 using a B-type viscometer when the solid concentration is 30%. , Preferably it is 1000-100000 mPa * s, More preferably, it is 2000-60000 mPa * s. Furthermore, the viscosity ratio is the following formula (1):
Viscosity ratio = V _30,6 / V _30,60 (1)
_{(Wherein, V 30,6} by using a B-type viscometer, in conformity with JIS Z8803, a viscosity (mPa.s) when the rotational speed 6rpm at a liquid temperature 25 ° _{C., V 30, 60} is B Using a viscometer, the viscosity (mPa.s) at a liquid temperature of 25 ° C. and a rotational speed of 60 rpm is shown in accordance with JIS Z8803)
And is preferably 2.0 to 5.0, more preferably 2.0 to 4.5. This viscosity ratio is generally called a thixotropy index (TI) and is an index that correlates with sagging difficulty. By using a urethane associative thickener with a viscosity and a viscosity ratio in the above range, it gives leveling viscosity to the coating solution for the receiving layer, improves surface quality, and exists in the form of particles. Binders are bound together to form a film, and heat fusion during image printing can be suppressed.

  The content of the urethane associative thickener is preferably 6 to 20% by mass, more preferably 6 to 15% by mass, based on the solid content of the binder resin in the receptor layer. When the content of the urethane associative thickener is within the above range, the receptor layer can be sufficiently formed, and heat fusion during image printing can be suppressed. In the present invention, a commercially available urethane associative thickener can also be used. For example, UH-526, UH-530, UH-540, UH-550 (above, manufactured by ADEKA Corporation), SN thickener A812 ( San Nopco Co., Ltd.) is preferable.

  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 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 mold release agents can also be used, and examples thereof include KF-510, KF-410, X22-3000T (manufactured by Shin-Etsu Chemical Co., Ltd.). 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 primer layer, an intermediate layer, and a release layer on the receiving layer side. Moreover, it can have a back surface layer on the opposite side to a receiving layer.

Primer layer The primer layer in the present invention is provided between the hollow layer and the receiving layer, and has a role of satisfactorily adhering the hollow layer and the receiving layer. It has a function of preventing the shift and improving the image storage stability. 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.

  The primer layer may contain the above-described surfactant, but more preferably does not contain the surfactant. Since the primer layer does not contain a surfactant, white spots during printing can be further prevented.

  The primer layer may include hollow particles. The content of the hollow particles in the primer layer is preferably 40 to 80% by mass, more preferably 50 to 80% by mass, and further preferably 55 to 75% by mass with respect to the total solid content mass of the primer layer. %. As the hollow particles, the same hollow particles contained in the hollow layer can be used.

  The primer layer may further contain a binder resin. The binder resin preferably contains a polymer latex, and more preferably contains a styrene / acrylic resin. The content of the binder resin in the primer layer is preferably 2 to 20% by mass and more preferably 3 to 20% by mass with respect to the total solid mass of the primer layer.

The primer layer may further contain gelatin. The gelatin is preferably alkali-treated gelatin. The gelatin content in the primer layer is preferably 10 to 30% by mass, and more preferably 15 to 25% by mass, based on the total solid mass of the primer layer. By using gelatin, interlayer adhesion of each layer can be improved. In particular, when each layer is formed by aqueous coating and simultaneous multilayer coating, the viscosity of each coating solution can be adjusted to a desired range to obtain a desired film thickness. In particular, by containing alkali-treated gelatin, a combination of jelly strength and presence / absence of molecular modification can be selected and optimized to desired film properties. 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. Known means can be used as a method for forming the intermediate layer. For example, a fluorescent 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.

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 paper is mistakenly mounted on the printer with the front and back sides reversed, and the thermal transfer sheet is superposed on the thermal transfer sheet, it will stick to the thermal transfer sheet and will not clog in the printer, and the printed matter will be discharged. (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 preferably contains a binder resin and inorganic fine 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 / 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. In the present invention, a commercially available binder resin can also be used, such as Bironal MD 1500 (manufactured by Toyobo Co., Ltd.), Plus Coat Z690 (manufactured by Kyoyo Chemical Co., Ltd.), Superflex 130 (Daiichi Kogyo Seiyaku ( Etc.) are preferable.

  The inorganic fine particles contained in the back layer are at least one selected from the group consisting of colloidal alumina, colloidal silica, and silica particles. By using such inorganic fine particles, it is possible to improve the backprint suitability and prevent blocking.

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.

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 applying 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. In the present invention, it is preferable that all layers constituting the receiving layer from the intermediate layer are formed by water-based coating on the side having the receiving layer. Furthermore, it is more preferable to form by all the layer water system application | coating which comprises the surface side which has a receiving layer.

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

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

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

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

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

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

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

  As the material of the heat transferable color material layer, conventionally known dyes can be used, but those having good characteristics as a printing material, for example, having a sufficient coloring density and changing color due to light, heat, temperature, etc. Those that do not are preferred. For example, as 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 Co., Ltd.). 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 ribbon used by the sublimation type thermal transfer system marketed 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 by solid content, and it diluted with the pure water as needed.

Example 1
Preparation of thermal transfer image-receiving sheet 1 RC paper (manufactured by Mitsubishi Paper Industries Co., Ltd.) was used as the base sheet, and the hollow layer coating solution and the receiving layer coating solution 1 having the following composition were each heated to 40 ° C. and slide coating was used Then, coating was performed so that the thicknesses at drying were 15 μm and 4 μm, respectively, and after cooling at 5 ° C. for 30 seconds, drying was performed at 40 ° C. for 2 minutes. / Receptive layer). This thermal transfer image receiving sheet has a layer structure as shown in FIG.
Composition of hollow layer coating solution 1 Hollow particles (acrylic hollow particles, volume average particle size: 0.5 μm, average hollow ratio: 45%, manufactured by Rohm and Haas Co., Ltd., trade name: Ropeke ST) 68 parts by mass Gelatin (alkali-treated gelatin, manufactured by Nitta Gelatin Co., Ltd., trade name: N1236)
20 parts by mass / binder resin (styrene / acrylic resin, manufactured by BASF Japan Ltd., trade name: Jonkrill 352J) 6 parts by mass / binder resin (styrene / acrylic resin, manufactured by BASF Japan Ltd., trade name: Jonkrill) 62J) 2 parts by mass The coating solution was diluted with pure water to adjust the solid content to 19%.
Composition of coating liquid 1 for receiving layer: binder resin 1 (vinyl chloride / vinyl acetate = 98/2) 100 parts by mass, release agent (silicone dispersion) 11 parts by mass, epoxy crosslinking agent (manufactured by Nagase ChemteX Corporation, Product name: Denacol EX512)
5 parts by mass / wax additive (Carnauba wax, manufactured by Chukyo Yushi Co., Ltd., trade name: Cellosol 524)
7 parts by mass / Thickener (ADEKA Corporation, trade name: UH-526) 6 parts by mass / anionic surfactant (dioctylsulfosuccinic acid Na salt, Daiichi Kogyo Seiyaku Co., Ltd., trade name: Neocor) SW-C) 3 parts by mass The coating liquid was diluted with pure water to adjust the solid content to 33%.

Preparation of Binder Resin 1 The above binder resin 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 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. 11.2 g of glycidyl methacrylate (2.5% by mass with respect to all charged monomers) was continuously added at a rate of 2.8 g / hr from the start of polymerization to 4 hours later. The polymerization was stopped when the saturated vapor pressure decreased by 0.6 MPa to obtain a vinyl chloride resin latex.

Preparation of Silicone Dispersion The above silicone dispersion was dispersed as follows to prepare an aqueous dispersion. First, an aqueous solution 1 and a solvent-based solution 1 were prepared so as to have the following composition. The aqueous solution 1 and the solvent solution 1 were mixed and stirred, and then dispersed using a homogenizer to prepare a dispersion. Then, the dispersion was desolvated under reduced pressure while warming to 30 to 60 ° C., the volume change of the desolvent was corrected by adding pure water, and the solid content was adjusted to 18%. An aqueous dispersion was obtained.
Composition of aqueous solution 1 · Triisopropyl naphthalene sulfonic acid Na salt (dispersant, solid content 10%) 10 parts by mass · Pure water 56 parts by mass
Composition of solvent-based solution 1 Silicone (manufactured by Shin-Etsu Chemical Co., Ltd., trade name: X-22-3000T) 11 parts by mass Silicone (manufactured by Shin-Etsu Chemical Co., Ltd., trade name: KF-410) 6 parts by weight・ 17 parts by mass of ethyl acetate

Comparative Example 1
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 receiving layer was as follows.
Composition of receiving layer coating liquid 2 Binder resin 1 (vinyl chloride / vinyl acetate = 98/2) 100 parts by mass Release agent (silicone dispersion) 11 parts by mass Epoxy crosslinking agent (manufactured by Nagase ChemteX Corporation, Product name: Denacol EX512)
5 parts by mass / wax additive (Carnauba wax, manufactured by Chukyo Yushi Co., Ltd., trade name: Cellosol 524)
7 parts by mass / Thickener (ADEKA Corporation, trade name: UH-526) 6 parts by mass The coating liquid was diluted with pure water to adjust the solid content to 33%.

Comparative Example 2
Preparation of thermal transfer image-receiving sheet 3 A thermal transfer image-receiving sheet 3 was prepared in the same manner as in Comparative Example 1, except that the composition of the coating solution for the hollow layer and the coating solution for the receiving layer was as follows.
Composition of hollow layer coating solution 2 Hollow particles (acrylic hollow particles, volume average particle size: 0.5 μm, average hollow ratio: 45%, manufactured by Rohm and Haas Co., Ltd., trade name: Ropaque ST) 68 parts by mass Gelatin (alkali-treated gelatin, manufactured by Nitta Gelatin Co., Ltd., trade name: N1236)
20 parts by mass / binder resin (styrene / acrylic resin, manufactured by BASF Japan Ltd., trade name: Jonkrill 352J) 6 parts by mass / binder resin (styrene / acrylic resin, manufactured by BASF Japan Ltd., trade name: Jonkrill) 62J) 2 parts by mass, anionic surfactant (dioctylsulfosuccinic acid Na salt, manufactured by Daiichi Kogyo Seiyaku Co., Ltd., trade name: Neocor SW-C) 0.2 parts by mass The coating solution was diluted with pure water. The solid content was adjusted to 19%.

Comparative Example 3
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 hollow-layer coating liquid 2 was used as the hollow-layer coating liquid.

Example 2
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 receiving layer was as follows.
Composition of coating liquid 3 for receiving layer: binder resin 1 (vinyl chloride / vinyl acetate = 98/2) 100 parts by mass, release agent (silicone dispersion) 11 parts by mass, epoxy crosslinking agent (manufactured by Nagase ChemteX Corporation, Product name: Denacol EX512)
5 parts by mass / wax additive (Carnauba wax, manufactured by Chukyo Yushi Co., Ltd., trade name: Cellosol 524)
7 parts by mass / Thickener (made by ADEKA Corp., trade name: UH-526) 6 parts by mass / fluorine-based surfactant (made by DIC Corporation, trade name: MegaFuck F-410) 3 parts by mass The coating solution was diluted with pure water to adjust the solid content to 33%.

Example 3
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 receiving layer was as follows.
Composition of coating liquid 4 for receiving layer: binder resin 1 (vinyl chloride / acetate vinyl = 98/2) 100 parts by mass, release agent (silicone dispersion) 11 parts by mass, epoxy cross-linking agent (manufactured by Nagase ChemteX Corporation, Product name: Denacol EX512)
5 parts by mass / wax additive (Carnauba wax, manufactured by Chukyo Yushi Co., Ltd., trade name: Cellosol 524)
7 parts by mass / Thickener (ADEKA Corporation, trade name: UH-526) 6 parts by mass / nonionic surfactant (Daiichi Kogyo Seiyaku Co., Ltd., trade name: DKS NL50) 3 parts by mass The coating solution was diluted with pure water to adjust the solid content to 33%.

Comparative Example 4
RC paper (manufactured by Mitsubishi Paper Industries Co., Ltd.) is used as a base material for producing the thermal transfer image-receiving sheet 7 , and on one side, coating solution 1 for hollow layer A, coating solution 1 for hollow layer B, and primer layer having the following composition the coating solution 1, and each heated above the receiving layer coating solution 1 to 40 ° C., using a slide coating, the coating amount after drying respectively ^{2.0g / m 2, 3.0g / m} 2, 3. A simultaneous multi-layer coating was applied so as to be 0 g / m ² and 3.5 g / m ^2, and after cooling at 5 ° C. for 30 seconds, drying was performed at 40 ° C. for 2 minutes. Hollow layer A / hollow layer B / primer layer / receptive layer) was obtained. The coating speed was 250 m / min. This thermal transfer image receiving sheet had a layer structure as shown in FIG.
Composition of coating liquid A-1 for hollow layer A (for lower layer) Hollow particles (acrylic hollow particles, volume average particle size: 0.5 μm, average hollow ratio: 45%, manufactured by Rohm and Haas Co., Ltd., trade name : Ropaque ST) 55 parts by mass Gelatin (manufactured by Nitta Gelatin Co., Ltd., trade name: N1236) 26 parts by mass of binder resin (styrene / acrylic resin, manufactured by BASF Japan Ltd., trade name: John Krill 352J) 8 Part by mass / binder resin (styrene / acrylic resin, manufactured by BASF Japan Ltd., trade name: Joncrill 62J) 8 parts by mass / anionic surfactant (dioctylsulfosuccinic acid Na salt, manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) Product name: Neocor SW-C) 0.01 parts by mass The coating solution was diluted with pure water to adjust the solid content to 15%.
Composition of coating liquid B-1 for hollow layer B (for upper layer) Hollow particles (acrylic hollow particles, volume average particle size: 0.5 μm, average hollow ratio: 45%, manufactured by Rohm and Haas Co., Ltd., trade name 59 parts by weight gelatin (made by Nitta Gelatin Co., Ltd., trade name: N1236) 28 parts by weight binder resin (styrene / acrylic resin, produced by BASF Japan Ltd., trade name: John Krill 352J) 5 Part by mass / binder resin (styrene / acrylic resin, manufactured by BASF Japan Ltd., trade name: Joncrill 62J) 8 parts by mass / anionic surfactant (dioctylsulfosuccinic acid Na salt, manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) Product name: Neocor SW-C) 0.1 parts by mass The coating solution was diluted with pure water to adjust the solid content to 19%.
Composition of primer layer coating solution 1 • Hollow particles (volume average particle size: 0.4 μm, average hollowness: 39%, manufactured by Rohm and Haas Co., Ltd., trade name: OA-39) 70 parts by mass gelatin (alkali Processed gelatin, Nitta Gelatin Co., Ltd., trade name: N1236)
16 parts by mass / binder resin (styrene / acrylic resin, manufactured by BASF Japan Ltd., trade name: Jonkrill 352J) 2 parts by mass / binder resin (styrene / acrylic resin, manufactured by BASF Japan Ltd., trade name: Jonkrill) 62J) 2 parts by mass / fluorescent brightener (manufactured by Showa Chemical Industry Co., Ltd., trade name: WN-1) 4 parts by mass / anionic surfactant (dioctylsulfosuccinic acid Na salt, manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) , Trade name: Neocol SW-C) 0.2 parts by mass The coating solution was diluted with pure water to adjust the solid content to 19%.

Example 4
Production of Thermal Transfer Image Receiving Sheet 8 A thermal transfer image receiving sheet 8 was produced in the same manner as in Comparative Example 4 except that the composition of the coating solution for hollow layer A and the coating solution for hollow layer B was as follows.
Composition of coating liquid A-2 for hollow layer A (for lower layer) Hollow particles (acrylic hollow particles, volume average particle size: 0.5 μm, average hollow ratio: 45%, manufactured by Rohm and Haas Co., Ltd., trade name : Ropaque ST) 55 parts by mass Gelatin (manufactured by Nitta Gelatin Co., Ltd., trade name: N1236) 26 parts by mass of binder resin (styrene / acrylic resin, manufactured by BASF Japan Ltd., trade name: John Krill 352J) 8 Part by mass / binder resin (styrene / acrylic resin, manufactured by BASF Japan Ltd., trade name: Joncrill 62J) 8 parts by mass The coating liquid was diluted with pure water to adjust the solid content to 15%.
Composition of coating liquid B-2 for hollow layer B (for upper layer) Hollow particles (acrylic hollow particles, volume average particle size: 0.5 μm, average hollow ratio: 45%, manufactured by Rohm and Haas Co., Ltd., trade name 59 parts by weight gelatin (made by Nitta Gelatin Co., Ltd., trade name: N1236) 28 parts by weight binder resin (styrene / acrylic resin, produced by BASF Japan Ltd., trade name: John Krill 352J) 5 Part by mass / binder resin (styrene / acrylic resin, manufactured by BASF Japan Ltd., trade name: Joncrill 62J) 8 parts by mass The coating liquid was diluted with pure water to adjust the solid content to 19%.

Example 5
Preparation of Thermal Transfer Image Receiving Sheet 9 A thermal transfer image receiving sheet 9 was prepared in the same manner as in Example 4 except that the composition of the primer layer coating solution was as follows.
Composition of primer layer coating solution 2 • Hollow particles (volume average particle size: 0.4 μm, average hollowness: 39%, manufactured by Rohm and Haas Co., Ltd., trade name: OA-39) 70 parts by mass gelatin (alkali Processed gelatin, Nitta Gelatin Co., Ltd., trade name: N1236)
16 parts by mass / binder resin (styrene / acrylic resin, manufactured by BASF Japan Ltd., trade name: Jonkrill 352J) 2 parts by mass / binder resin (styrene / acrylic resin, manufactured by BASF Japan Ltd., trade name: Jonkrill) 62J) 2 parts by mass / fluorescent brightener (manufactured by Showa Chemical Industry Co., Ltd., trade name: WN-1) 4 parts by mass The coating liquid was diluted with pure water to adjust the solid content to 19%.

Evaluation of Thermal Transfer Image Receiving Sheet The thermal transfer image receiving sheet produced above was subjected to (1) coating surface quality evaluation, (2) coating defect evaluation, and (3) moisture resistance / heat resistance evaluation.

(1) Evaluation of coated surface quality By visually observing the thermal transfer image-receiving sheet produced as described above, the following criteria were used.
Evaluation criteria 3: No unevenness was observed in the coating surface quality.
2: Unevenness was not recognized at first glance, but slightly unevenness was observed when viewed close to each other.
1: Printing unevenness was observed at first glance.

(2) Coating defect evaluation 120 gray was printed on the thermal transfer image-receiving sheet produced above using a sublimation thermal transfer printer (manufactured by ALTECH ADS, model: MEGAPICEL III), and the number of white spots was visually evaluated.
Evaluation criteria 3: The number of white spots of 0.1 mm 2 or more was less than 2.
2: The number of white spots of 0.1 mm 2 or more was less than 5.
1: The number of white spots of 0.1 mm 2 or more was 5 or more.

(3) Evaluation of moisture resistance and heat resistance A 0.5 mm-wide linear image (black) was printed on the thermal transfer image-receiving sheet prepared above using a sublimation thermal transfer printer (manufactured by ALTECH ADS, model: MEGAIXEL III). Although the printed matter was stored in an environment of 40 ° C. and 90% for one week, the image blur was visually evaluated.
Evaluation criteria 4: No bleeding was confirmed.
3: Although the line is slightly blurred, there was no practical problem.
2: The lines were somewhat blurred due to bleeding, and there was a problem in practical use.
1: Bleeding was clearly confirmed, and there was a problem in practical use.

The results of the above evaluations are shown in Table 1. It can be seen that the thermal transfer image-receiving sheet of the example satisfying the composition of the present invention has excellent coating surface quality and can prevent white spots during printing as compared with the thermal transfer image-receiving sheet of the comparative example.

DESCRIPTION OF SYMBOLS 10 Thermal transfer image receiving sheet 11 Base material 12 Hollow layer 13 Receiving layer 20 Thermal transfer image receiving sheet 21 Base material 22 Hollow layer A (lower layer)
23 Hollow layer B (upper layer)
24 Primer layer 25 Receptor layer

Claims (7)

A thermal transfer image receiving sheet comprising a base material, a hollow layer, and a receiving layer in this order on the base material,
The receptor layer comprises a surfactant;
A thermal transfer image-receiving sheet, wherein the layer in contact with the substrate does not contain a surfactant.   The thermal transfer image receiving sheet according to claim 1, wherein the surfactant is at least one selected from the group consisting of an anionic surfactant, a fluorosurfactant, and a nonionic surfactant.   The thermal transfer image-receiving sheet according to claim 1 or 2, wherein the hollow layer is composed of two or more layers, and the lowermost hollow layer in contact with the substrate in the two or more hollow layers does not contain a surfactant.   The thermal transfer image-receiving sheet according to claim 3, wherein the hollow layer is composed of two or more layers, and all of the two or more hollow layers do not contain a surfactant.   The thermal transfer image receiving sheet according to any one of claims 1 to 4, further comprising a primer layer between the hollow layer and the receiving layer.   The thermal transfer image receiving sheet according to claim 5, wherein the primer layer does not contain a surfactant.   The thermal transfer image receiving sheet according to any one of claims 1 to 6, wherein all layers constituting the surface side having the receiving layer on the substrate are formed by aqueous coating.

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