JP5772049B2 - Thermal transfer recording medium and manufacturing method thereof - Google Patents

Description

  The present invention relates to a thermal transfer recording medium and a manufacturing method thereof.

  2. Description of the Related Art Conventionally, a thermal transfer recording method has been implemented which comprises heating a heat-meltable coloring material and transferring it to a recording paper. As a thermal transfer recording medium used for such thermal transfer recording, there is one in which a colored layer containing a heat-meltable coloring material is provided on a support substrate. In order to improve the transferability of the colorant, for example, a structure in which a release layer is provided between the support base and the color layer or an adhesive layer is provided on the color layer has been proposed.

  In such a thermal transfer recording medium having a release layer, a colored layer, and an adhesive layer on such a support substrate, the transferability to various recording papers, stability, improvement in sensitivity, sharpness after transfer, etc. are taken into consideration. Various ink materials have been studied. For example, as the ink material for forming the release layer, the colored layer, or the adhesive layer, a material in which a heat-meltable material is dissolved or dispersed in a dispersion has been proposed.

Japanese Patent No. 2571217 Patent No. 2511450 Japanese Patent No. 3032605

  For thermal transfer recording media, in addition to improvements in thermal transferability, print clarity and durability, in recent years it has become important to reduce the use of solvents, especially organic solvents, in order to reduce environmental impact. It's getting on. However, in order to reduce the amount of solvent used, even if attempts are made to increase the concentration of release agents, colorants, adhesives, heat-meltable materials, etc. in the ink material, this cannot be achieved sufficiently, or each component is uniformly distributed. The dispersibility or dispersibility and coatability may be reduced, and a long time may be required for drying, which may make it difficult to efficiently produce a thermal transfer recording medium. Further, it may be difficult to perform high-quality thermal transfer printing due to a decrease in thermal transferability, a decrease in printing accuracy or sharpness, and a decrease in storage stability of the thermal transfer recording medium.

  An object of the present invention is to provide a thermal transfer recording medium capable of high-quality thermal transfer printing, and a method for producing a thermal transfer recording medium that uses a small amount of solvent and has a low environmental load.

  The thermal transfer recording medium according to the present invention is a thermal transfer recording medium in which a release layer, a colored layer, and an adhesive layer are formed in this order on a substrate, and the release layer has an average particle size of 30 μm in an aqueous dispersion medium. A heat-meltable material containing a granular heat-meltable material formed from an aqueous emulsion in which particles of the following heat-meltable material are dispersed, wherein the colored layer has an average particle size of 0.1 to 50 μm in an oily dispersion medium The adhesive layer is formed from a water-based emulsion in which particles having an average particle size of 5 μm or less are dispersed in an aqueous dispersion medium. And a granular heat-meltable material.

  In such a thermal transfer recording medium according to the present invention, as a preferred embodiment, the release layer is made of at least one heat-meltable material selected from the group consisting of carnauba wax, candelilla wax, beeswax, wood wax and montan wax. Contains.

  In such a thermal transfer recording medium according to the present invention, as a preferred embodiment, the colored layer is made of at least one heat-meltable material selected from the group consisting of carnauba wax, candelilla wax, beeswax, wood wax and montan wax. Contains.

  In such a thermal transfer recording medium according to the present invention, as a preferred embodiment, the adhesive layer is made of at least one heat-meltable material selected from the group consisting of carnauba wax, candelilla wax, beeswax, wood wax and montan wax. Contains.

  Such a thermal transfer recording medium includes, as a preferred embodiment, one having a heat-resistant layer on the surface of the substrate opposite to the surface on which the release layer, the colored layer and the adhesive layer are formed. .

  The method for producing a thermal transfer recording medium according to the present invention prepares a coating solution for forming a release layer containing a water-based emulsion in which particles of a heat-meltable material having an average particle size of 30 μm or less are dispersed in an aqueous dispersion medium. A coating liquid for forming a colored layer containing a dispersion in which particles of a heat-meltable material having an average particle diameter of 0.1 to 50 μm are dispersed in a medium and a coloring material is prepared, and an average particle diameter of 5 μm or less is prepared in an aqueous dispersion medium. An adhesive layer-forming coating solution containing an aqueous emulsion in which particles of a heat-meltable material are dispersed is prepared, and the above-mentioned release layer-forming coating solution, colored layer-forming coating solution and adhesive layer-forming material are formed on a substrate. A thermal transfer recording medium in which a release layer, a colored layer, and an adhesive layer are formed in this order on the substrate is obtained by sequentially applying and drying the coating liquid.

  The thermal transfer recording medium according to the present invention is a thermal transfer recording medium in which a release layer, a colored layer, and an adhesive layer are formed in this order on a substrate, and the release layer has an average particle size of 30 μm in an aqueous dispersion medium. A heat-meltable material containing a granular heat-meltable material formed from an aqueous emulsion in which particles of the following heat-meltable material are dispersed, wherein the colored layer has an average particle size of 0.1 to 50 μm in an oily dispersion medium The adhesive layer is formed from a water-based emulsion in which particles having an average particle size of 5 μm or less are dispersed in an aqueous dispersion medium. High-quality thermal transfer printing is possible because it contains a granular heat-meltable material, the color layer during printing is good, the printing density can be maintained high, Printable And those less contamination of the substrate during printing. And storage stability is high, and even if it preserve | saves for a long period of time, generation | occurrence | production of blocking is suppressed.

  In addition, the method for manufacturing a thermal transfer recording medium according to the present invention can efficiently manufacture the above-described thermal transfer recording medium without imposing a burden on the environment.

<Thermal transfer recording medium>
The thermal transfer recording medium according to the present invention is a thermal transfer recording medium in which a release layer, a colored layer and an adhesive layer are formed in this order on a substrate,
The release layer contains a granular heat-meltable material formed from an aqueous emulsion in which particles of a heat-meltable material having an average particle size of 30 μm or less are dispersed in an aqueous dispersion medium,
The colored layer contains a granular heat-meltable material and a colorant formed from a dispersion in which particles of a heat-meltable material having an average particle diameter of 0.1 to 50 μm are dispersed in an oil-based dispersion medium, and the adhesion The layer contains a granular heat-meltable material formed from an aqueous emulsion in which particles having an average particle size of 5 μm or less are dispersed in an aqueous dispersion medium.

(1) Substrate As the substrate of the thermal transfer recording medium according to the present invention, various substrates can be adopted. For example, various plastic materials such as polyester, polycarbonate, polyamide, polyimide, triacetyl cellulose, polyphenylene sulfite, polyvinyl chloride, polyethylene, polypropylene, etc., and paper such as glassine paper and condenser paper can be used. it can. In the present invention, from the viewpoint of heat resistance and strength, among the above, polyester, polycarbonate, polyamide, and polyimide are preferable, and polyester is particularly preferable. The thickness of the base material is preferably 2.5 to 12 μm, particularly preferably 3.5 to 6.0 μm.

(2) Release Layer The release layer of the thermal transfer recording medium according to the present invention comprises particles of a heat-meltable material having an average particle size of 30 μm or less.

  When the average particle diameter of the heat-meltable material particles exceeds 30 μm, it is difficult to uniformly transfer the heat of the thermal head during printing, which is not preferable because the print definition is deteriorated. The average particle diameter of the heat-meltable material particles is preferably 0.1 to 10 μm, particularly preferably 0.5 to 2.0 μm. When the average particle size exceeds 30 μm, the sharpness of printing deteriorates, which is not preferable. Here, the average particle size is determined by a scattering type particle size distribution measuring apparatus LA-950 manufactured by HORIBA.

If the average particle size of the heat-meltable material is 30 μm or less, particles having a particle size exceeding 30 μm may exist. (It is preferable that the amount of particles of the hot-melt material exceeding 30 μm is small, but less than 20% by weight, preferably 10% by weight, based on the total particles of the heat-meltable material present in the release layer If it is less, particles having a particle size exceeding 30 μm may exist.)
The heat-meltable material has a melting point of preferably 50 to 100 ° C, particularly preferably 60 to 95 ° C. When the melting point is less than 50 ° C., there is a problem in storage stability, and when it exceeds 100 ° C., the sensitivity at the time of printing is not preferable.

  Examples of the heat-meltable material that can be used in the present invention include (a) plant-derived waxes such as carnauba wax, tree wax, candelilla wax, rice wax and the like (b) animal-derived waxes. (E) beeswax, whale wax, etc. (c) petroleum-derived waxes, eg paraffin wax, microcrystalline wax, etc. (d) mineral-derived waxes, eg montan wax, ozokerite, ceresin wax, etc. Synthetic waxes such as Fischer-Trops wax, polyethylene wax, fatty acid esters, fatty acid amides, ketones / amines, hydrogenated oils and the like can be mentioned. Two or more kinds of heat-meltable materials can be used in combination. Particularly preferred heat-meltable materials in the present invention are carnauba wax, candelilla wax, beeswax, wood wax and montan wax.

  The thickness of the release layer is preferably 0.1 to 30 μm, particularly 0.5 to 5.0 μm. If the thickness of the release layer is less than 0.1 μm, the effect of peeling cannot be exhibited. On the other hand, if it exceeds 30 μm, it becomes difficult to transfer the amount of heat from the thermal head, so that the transferability tends to deteriorate. It is not preferable in terms.

  The release layer of the thermal transfer recording medium according to the present invention is prepared by preparing a release layer forming coating solution containing an aqueous emulsion in which particles of a heat-meltable material having an average particle size of 30 μm or less are dispersed in an aqueous dispersion medium. Can be formed by coating on a substrate.

  Here, the water-based emulsion refers to the particles of the heat-meltable material as a dispersoid, and other aqueous liquid that does not substantially dissolve the dispersoid (or the solubility of the dispersoid is extremely low) is a dispersion medium (that is, , Continuous phase).

  As a method for preparing the aqueous emulsion, any method can be adopted as long as the above-described aqueous emulsion can be formed.

  The quantity ratio of the heat-meltable material and the aqueous liquid in the water-based emulsion is arbitrary as long as the water-based emulsion is formed. In general, the heat-meltable material is 1 to 70% by weight, preferably 3 to 60% by weight, particularly preferably 5 to 50% by weight (the sum of the heat-meltable material and the aqueous liquid is 100% by weight). ). If the heat-meltable material is less than 1% by weight, it becomes difficult to dry, resulting in poor productivity. On the other hand, if it exceeds 70% by weight, a stable aqueous emulsion may not be formed easily.

  Coating of the prepared release layer forming coating solution onto the substrate can be performed by any method. Examples of particularly preferable coating methods in the present invention include bar coating, gravure coating, and die coating.

The coating amount of the coating liquid for forming the release layer is 0.1 to 30 μm, preferably 0.3 to 10.0 μm, particularly preferably 0.5 to the thickness after the release layer is dried. It is prepared within a range of 5.0 μm. When a preferable specific example is shown, the coating amount of the release layer forming coating solution is 0.1 to 30 g / m ² , preferably 0.3 to 10.0 g / m ² , particularly preferably 0.5 to 5. Within a range of 0.0 g / m ² .

  The release layer-forming coating solution coated on the substrate can be dried at room temperature of 5 to 35 ° C. or under heating conditions of 50 to 150 ° C.

(3) Colored layer The colored layer of the thermal transfer recording medium according to the present invention is a granular heat-meltable material formed from a dispersion in which particles of a heat-meltable material having an average particle diameter of 0.1 to 50 μm are dispersed in an oil-based dispersion medium. It contains a material and a coloring material.

  The average particle diameter of the heat-meltable material particles is preferably 0.5 to 20 μm, particularly preferably 1.0 μm to 10 μm. When the average particle diameter exceeds 50 μm, it is difficult to uniformly transmit heat from the thermal head, so that the sharpness is deteriorated. On the other hand, when the average particle size is less than 0.1 μm, there is a problem in storage stability, which is not preferable. Here, the average particle size is determined by a scattering type particle size distribution measuring apparatus LA-950 manufactured by HORIBA.

  If the average particle diameter of the heat-meltable material is within the above range, particles having a particle diameter of less than 0.1 μm and / or particles having a particle diameter exceeding 50 μm may exist. The amount of these particles is preferably small, but if the amount is less than 20% by weight, preferably less than 10% by weight, based on the total particles of the heat-meltable material present in the colored layer, May be present.

  The heat-meltable material has a melting point of preferably 50 to 100 ° C, particularly preferably 60 to 95 ° C. When the melting point is less than 50 ° C., there is a problem in storage stability, and when it exceeds 100 ° C., the sensitivity at the time of printing is not preferable.

  Examples of the heat-meltable material that can be used in the present invention include (a) plant-derived waxes such as carnauba wax, tree wax, candelilla wax, rice wax and the like (b) animal-derived waxes. For example, beeswax, whale wax, etc. (c) petroleum-derived wax, for example, paraffin wax, microcrystalline wax, etc. (d) mineral-derived wax, for example, montan wax, ozokerite, ceresin wax, etc. Synthetic waxes such as Fischer-Trops wax, polyethylene wax, fatty acid esters, fatty acid amides, ketones / amines, hydrogenated oils and the like can be mentioned. Two or more kinds of heat-meltable materials can be used in combination. Particularly preferred heat-meltable materials in the present invention are carnauba wax, candelilla wax, beeswax, wood wax and montan wax.

  The thickness of the colored layer is preferably 0.1 to 50 μm, particularly preferably 0.5 to 30 μm. When the thickness of the colored layer is less than 0.1 μm, sufficient print density tends not to be obtained. On the other hand, when the thickness exceeds 50 μm, the heat from the thermal head becomes difficult to transmit uniformly, resulting in poor clarity. Therefore, it is not preferable.

  The colored layer of the thermal transfer recording medium according to the present invention is prepared as a colored layer forming coating solution containing a dispersion in which particles of a heat-meltable material having an average particle diameter of 0.1 to 50 μm are dispersed in an oil-based dispersion medium and a coloring material. And it can form by apply | coating this coating liquid on the said peeling layer.

  Here, the dispersion means the particles of the heat-meltable material as a dispersoid, and other organic liquids that do not substantially dissolve the dispersoid (or the solubility of the dispersoid is remarkably low) (that is, the dispersion medium) , Continuous phase).

  Examples of the organic liquid constituting the dispersion dispersion medium (that is, the continuous phase) include methyl alcohol, ethyl alcohol, isopropyl alcohol (IPA), toluene, xylene, methyl ethyl ketone, ethyl acetate, butyl acetate, and normal hexane. And xylene. Of these, toluene, methyl ethyl ketone, and isopropyl alcohol are particularly preferable.

  As the coloring material, those dispersible in the organic liquid, for example, carbon black, color pigment, titanium oxide, silica, talc, barium sulfate and the like are preferable. The average particle diameter of the coloring material is preferably 0.01 to 10 μm, particularly preferably 0.1 to 1.0 μm. When the average particle diameter exceeds 10 μm, the sharpness of printing is impaired, which is not preferable. On the other hand, when the average particle size is less than 0.01 μm, the concealability is lowered and the colorability is inferior. Here, the average particle size is determined by a scattering type particle size distribution measuring apparatus LA-950 manufactured by HORIBA.

  The mixing ratio of the coloring material is 10 to 90% by weight, preferably 20 to 80% by weight, particularly preferably 30 to 70% by weight (the total of the heat-meltable material and the coloring material is 100% by weight). . When the mixing ratio of the color material is less than 10% by weight, sufficient print density tends to be not obtained. On the other hand, when it exceeds 90% by weight, the film becomes too brittle, which is not preferable.

  The above dispersion can be obtained by mixing and stirring the heat-meltable material forming the dispersoid, the coloring material, and the organic liquid forming the dispersion medium.

  The mixing ratio of the heat-meltable material and the organic liquid is arbitrary as long as a desired dispersion is formed. Generally, the mixing ratio of the heat-meltable material is 1 to 60% by weight, preferably 5 to 50% by weight, particularly preferably 10 to 40% by weight (the total of the heat-meltable material and the organic liquid is 100% by weight. %). When the mixing ratio of the heat-meltable material is less than 1% by weight, the drying property is deteriorated at the time of coating. On the other hand, when it exceeds 60% by weight, a stable dispersion may be hardly formed.

  Stirring is preferably performed at a normal temperature of 5 to 35 ° C. using a known stirrer such as a ball mill, an attritor, a homogenizer, or a high-speed dispersion type mill. Can be carried out under heating conditions exceeding.

  Application of the prepared colored layer forming coating solution to the release layer can be performed by any method. Examples of particularly preferable coating methods in the present invention include bar coating, gravure coating, and die coating.

The coating amount of the coating liquid for forming the colored layer is such that the thickness of the colored layer is 0.1 to 50 μm, preferably 0.5 to 30 μm, particularly preferably 1.0 to 10 μm, after drying. It prepares in the range which becomes. When a specific example is shown, the coating amount of the colored layer forming coating solution is 0.1 to 50 g / m ² , preferably 0.5 to 30 g / m ² , particularly preferably 1.0 to 10 g / m. ^2. Within the range such that

  The colored layer-forming coating solution coated on the substrate can be dried at room temperature of 5 to 35 ° C or under heating conditions of 50 to 150 ° C.

(4) Adhesive Layer The adhesive layer of the thermal transfer recording medium according to the present invention comprises particles of a heat-meltable material having an average particle diameter of 5 μm or less.

  When the average particle diameter of the heat-meltable material particles exceeds 5 μm, the surface smoothness is lowered, so that the sharpness of printing deteriorates, which is not preferable. The average particle diameter of the heat-meltable material particles is preferably 0.1 to 5.0 μm, particularly preferably 0.5 to 3.0 μm. When the average particle diameter exceeds 5 μm, the sharpness of printing is deteriorated, which is not preferable. Here, the average particle size is determined by a scattering type particle size distribution measuring apparatus LA-950 manufactured by HORIBA.

  If the average particle size of the heat-meltable material is 5 μm or less, particles having a particle size exceeding 5 μm may exist. It is preferable that the amount of particles of the heat-meltable material having a particle size exceeding 5 μm is small, but less than 30% by weight, preferably less than 20% by weight, based on all particles of the heat-meltable material present in the adhesive layer If so, there may be particles having a particle size exceeding 5 μm.

  The heat-meltable material has a melting point of preferably 50 to 100 ° C, particularly preferably 60 to 95 ° C. When the melting point is less than 50 ° C., there is a problem in storage stability, and when it exceeds 100 ° C., the sensitivity at the time of printing is not preferable.

  Examples of the heat-meltable material that can be used in the present invention include (a) plant-derived waxes such as carnauba wax, tree wax, candelilla wax, rice wax and the like (b) animal-derived waxes. For example, beeswax, whale wax, etc. (c) petroleum-derived wax, for example, paraffin wax, microcrystalline wax, etc. (d) mineral-derived wax, for example, montan wax, ozokerite, ceresin wax, etc. Synthetic waxes such as Fischer-Trops wax, polyethylene wax, fatty acid esters, fatty acid amides, ketones / amines, hydrogenated oils and the like can be mentioned. Two or more kinds of heat-meltable materials can be used in combination. Particularly preferred heat-meltable materials in the present invention are carnauba wax, candelilla wax, beeswax, wood wax and montan wax.

  The thickness of the adhesive layer is preferably 0.1 to 5 μm, particularly preferably 0.3 to 2.0 μm. If the thickness of the adhesive layer is less than 0.1 μm, the transferability tends to be poor. On the other hand, if it exceeds 5 μm, the transferability does not tend to improve, and only the ink consumption increases, which is not preferable.

  The adhesive layer of the thermal transfer recording medium according to the present invention is prepared by preparing a coating liquid for forming an adhesive layer containing an aqueous emulsion in which particles of a heat-meltable material having an average particle size of 5 μm or less are dispersed in an aqueous dispersion medium. Can be formed by coating on the colored layer.

  Here, the water-based emulsion refers to the particles of the heat-meltable material as a dispersoid, and other aqueous liquid that does not substantially dissolve the dispersoid (or the solubility of the dispersoid is extremely low) is a dispersion medium (that is, , Continuous phase).

  As a method for preparing the aqueous emulsion, any method can be adopted as long as the above-described aqueous emulsion can be formed.

  The quantity ratio of the heat-meltable material and the aqueous liquid in the water-based emulsion is arbitrary as long as the water-based emulsion is formed. In general, the heat-meltable material is 1 to 70% by weight, preferably 3 to 60% by weight, particularly preferably 5 to 50% by weight (the sum of the heat-meltable material and the aqueous liquid is 100% by weight). ). If the heat-meltable material is less than 1% by weight, it becomes difficult to dry, resulting in poor productivity. On the other hand, if it exceeds 70% by weight, a stable aqueous emulsion may not be formed easily.

  The prepared coating solution for forming an adhesive layer can be applied to the substrate by any method. Examples of particularly preferable coating methods in the present invention include bar coating, gravure coating, and die coating.

The coating amount of the coating liquid for forming the adhesive layer is such that the thickness of the adhesive layer after drying is 0.1 to 5.0 μm, preferably 0.2 to 3.0 μm, particularly preferably 0. It is prepared within a range of 3 to 2.0 μm. When showing a preferred embodiment, the coating amount of the adhesive layer forming coating solution, 0.1 to 5.0 g / ^{m 2,} preferably 0.2 to 3.0 g / ^{m 2,} particularly preferably 0.3 It is in the range which becomes -2.0 g / m < ² >.

  The coating liquid for forming an adhesive layer coated on the colored layer can be dried at room temperature of 5 to 35 ° C or under heating conditions of 50 to 150 ° C.

(5) Others The thermal transfer recording medium according to the present invention is a thermal transfer recording medium in which a release layer, a colored layer and an adhesive layer are formed in this order on a substrate. A heat-resistant layer can be provided on the surface opposite to the surface on which the adhesive layer is formed, if necessary.

  This heat-resistant layer functions as a heat-resistant protective layer when in contact with the thermal head when the thermal transfer recording medium according to the present invention is used for thermal transfer, and at the same time, prevents the thermal transfer recording medium from blocking when the thermal transfer recording medium is stored. It has a function to further improve.

  Examples of such a heat-resistant layer include those made of silicone resin, fluorine resin, polyimide resin, nitrocellulose, melamine resin, acrylic resin, polyester resin, and the like. Particularly preferred for the present invention is that formed from a polymer in which silicone and / or fluorine components are copolymerized.

  Such a heat-resistant layer can be formed by applying a coating liquid containing at least one of the above resin materials on a substrate and then drying it. The thickness of the heat-resistant layer is 0.01 to 1.0 μm, preferably 0.05 to 0.8 μm, and particularly preferably 0.1 to 0.5 μm after drying.

<Method for producing thermal transfer recording medium>
The method for producing a thermal transfer recording medium according to the present invention comprises:
A release layer forming coating solution containing an aqueous emulsion in which particles of a heat-meltable material having an average particle size of 30 μm or less are dispersed in an aqueous dispersion medium,
Preparing a coating solution for forming a colored layer comprising a dispersion in which particles of a heat-meltable material having an average particle size of 0.1 to 50 μm are dispersed in an oil-based dispersion medium and a coloring material
Preparing an adhesive layer-forming coating solution containing an aqueous emulsion in which particles of a heat-meltable material having an average particle size of 5 μm or less are dispersed in an aqueous dispersion medium;
By sequentially coating and drying the release layer forming coating solution, the colored layer forming coating solution and the adhesive layer forming coating solution on the substrate, the release layer and the colored layer are formed on the substrate. And a thermal transfer recording medium in which an adhesive layer is formed in this order.

  The peeling layer forming coating solution, the colored layer forming coating solution and the adhesive layer forming coating solution used in the method for producing a thermal transfer recording medium according to the present invention are described in detail in the section <Thermal Transfer Recording Medium>. It is as it is.

  According to the thermal transfer recording medium of the present invention, high-quality thermal transfer printing can be performed, the colored layer can be easily removed during printing, the printing density can be maintained high, and high-definition printing is possible. . In addition, the printed material is less soiled during printing, has high storage stability, and even when stored for a long time, the occurrence of blocking is suppressed.

  The reason why such an effect is obtained in the present invention is currently under investigation, but mainly due to the fact that the average particle size of the hot-melt material present in the colored layer is limited within a specific range, the colored layer The amount of the heat-meltable material and the colorant contained therein can be maintained stably and high, and the colored layer is formed from a predetermined dispersion, and both the release layer and the adhesive layer are formed from a predetermined aqueous emulsion. As a result, the colored layer, the release layer, and the adhesive layer described above are minimally affected by adjacent layers (for example, some mutual influence in the interface region between layers) and erosion when forming other layers. It is presumed that being suppressed is involved.

<Example 1>
Prepare the following substrate, release layer-forming coating solution, colored layer-forming coating solution, adhesive layer-forming coating solution, and heat-resistant layer-forming coating solution. The thermal transfer recording medium according to the present invention was manufactured by sequentially coating and drying the release layer forming coating solution, the colored layer forming coating solution, and the adhesive layer forming coating solution.

(1) Substrate: 4.5 μPET film (2) Release layer forming coating solution: Carnauba emulsion having an average particle size of 0.5 μm (manufactured by Chukyo Yushi Co., Ltd., “Trasol O-102” (solid content 40%)) Emulsion mixed at a ratio of 50 parts to 50 parts of water (3) Colored layer forming coating solution: 15 parts of carnauba wax (solid content 100%), 15 parts of carbon black, and 70 parts of isopropanol were averaged with glass beads of φ1 mm Dispersion pulverized so as to have a particle size of 2.0 μm (4) Adhesive layer forming coating solution: average particle size: 0.5 μm carnauba emulsion (manufactured by Chukyo Yushi Co., Ltd., “Trasol M-221” (solid content 35%)) Emulsion mixed at a ratio of 50 parts and 50 parts of water (5) Coating solution for forming a heat-resistant layer: Silicone resin solution (6) Production method: Barco coats a coating solution for forming a heat-resistant layer on a substrate After coating and drying, the opposite substrate surface is coated with a release layer forming coating solution, a colored layer forming coating solution, and an adhesive layer forming coating solution, followed by bar coating and drying. Manufactured by.
The obtained thermal transfer recording medium had a substrate thickness of 4.5 μm, a release layer coating amount of 1.5 g / m ² , a colored layer coating amount of 2.0 g / m ² , and an adhesive layer coating. The work amount was 1.0 g / m ² , and the coating amount of the heat-resistant layer was 0.3 g / m ² .
This thermal transfer recording medium was evaluated by the following [Evaluation Method].
The results are as shown in Table 2.

[Evaluation method]
(A) Transferability to label Using a label printer (TEC-SA4TM, manufactured by TEC), printing was performed on label C6 (Linktech) at a printing speed of 6IPS and a printing energy of 0.
The printed matter was visually observed to evaluate transferability.
○: Can be transferred without any problem
Δ: Some printouts are missing
X: No transfer and printing was not possible (b) Label contamination during printing Using a label printer (TEC Corporation, "TEC-SA4TM"), printing speed: 6IPS, printing energy: 0, label Printing was performed on C6 (manufactured by Linktech).
The printed matter was visually observed to confirm whether there was any dirt when the head was down.
○: No contamination, no problem
X: Contamination occurred (c) Print clarity Using a label printer (TEC, "TEC-SA4TM"), printing on label C6 (Linktech) at a printing speed of 6IPS and a printing energy of 0 Went.
The printed matter was visually observed to check for the occurrence of voids (white spots on the printed matter).
○: No generation of voids, no problem
△: Level where no voids are generated but there is no practical problem
×: Level where there are many voids and there are practical problems (d) Print density Label C6 using a label printer (“TEC-SA4TM” manufactured by TEC) at a printing speed of 6IPS and a printing energy of 0 Printing was performed on (Linktech).
The printed matter was visually observed, and the print density was evaluated with a densitometer (manufactured by Macbeth, “RD-19i”).
○: No problem in printing density (reference value: 1.6 or more)
Δ: Print density is low (reference value: 1.2 to 1.6)
×: Print density is extremely low (reference value: 1.2 or less)
(E) Preservability The thermal transfer recording medium processed into the inner winding was stored for 100 hours in an atmosphere of 50 ° C. and 90%, and then the presence or absence of blocking was confirmed.
○: No problem at all
X: Environmental impact degree with occurrence of blocking (f): The total amount of solvent used in the coating solution for forming the release layer, the colored layer, and the adhesive layer is 5 g / m ² or less.
×: Peeling layer, colored layer, the total amount of solvent used in the adhesive layer forming coating solution is more than 5 g / m ^2.
However, the amount of solvent used is the total value of each layer calculated under the following conditions.
If the release layer has a solid content of 25%, the coating amount is 1.5 g / m ² , and the dispersion is used, the amount of solvent used in the release layer is 4.5 g / m ² .
If the colored layer has a solid content of 30%, the coating amount is 2.0 g / m ² , and the dispersion is used, the amount of solvent used in the colored layer is 4.6 g / m ² .
If the adhesive layer has a solid content of 25%, the coating amount is 1.0 g / m ² , and the dispersion is used, the solvent usage of the adhesive layer is 3.0 g / m ² .
In the above case, the total amount of solvent used in the peeling layer, the colored layer, and the adhesive layer forming coating solution is 4.5 + 4.6 + 3.0 = 12.1 g / m ² .
In addition, the solvent loading is 0 g / m ² if any layer is an emulsion.

<Example 2>
In the same manner as in Example 1, except that the following substrate, release layer forming coating solution, colored layer forming coating solution, adhesive layer forming coating solution, and heat resistant layer forming coating solution were used. A thermal transfer recording medium according to the invention was produced.

(1) Substrate: 4.5 μPET film (2) Release layer forming coating solution: Carnauba emulsion having an average particle size of 0.5 μm (manufactured by Chukyo Yushi Co., Ltd., “Trasol O-102” (solid content 40%)) Emulsion mixed at a ratio of 50 parts to 50 parts of water (3) Colored layer forming coating solution: 15 parts of carnauba wax (solid content 100%), 15 parts of carbon black, and 70 parts of isopropanol were averaged with glass beads of φ1 mm Dispersion pulverized so as to have a particle diameter of 2.0 μm (4) Coating liquid for forming an adhesive layer: Emulsion mixed at a ratio of 50 parts of carnauba emulsion having an average particle diameter of 0.1 μm and 50 parts of water (5) Heat-resistant layer-forming coating solution: Silicone resin solution (6) Manufacturing method: Heat-resistant layer-forming coating solution is coated on the substrate by bar coating, and after drying, a release layer is formed on the opposite substrate surface Coating The coating liquid, the coating liquid for forming the colored layer, and the coating liquid for forming the adhesive layer were sequentially coated by bar coating and dried.

The obtained thermal transfer recording medium had a substrate thickness of 4.5 μm, a release layer coating amount of 1.5 g / m ² , a colored layer coating amount of 2.0 g / m ² , and an adhesive layer coating. The work amount was 1.0 g / m ² , and the coating amount of the heat-resistant layer was 0.3 g / m ² .
This thermal transfer recording medium was evaluated in the same manner as in Example 1.
The results are as shown in Table 2.

< Reference Example 3>
In the same manner as in Example 1, except that the following substrate, release layer forming coating solution, colored layer forming coating solution, adhesive layer forming coating solution, and heat resistant layer forming coating solution were used. A thermal transfer recording medium according to the invention was produced.

(1) Substrate: 4.5 μPET film (2) Release layer forming coating solution: Carnauba emulsion having an average particle size of 0.5 μm (manufactured by Chukyo Yushi Co., Ltd., “Trasol O-102” (solid content 40%)) Emulsion mixed at a ratio of 50 parts to 50 parts of water (3) Colored layer forming coating solution: 15 parts of carnauba wax (solid content 100%), 15 parts of carbon black, and 70 parts of isopropanol were averaged with glass beads of φ1 mm Dispersion pulverized so as to have a particle diameter of 2.0 μm (4) Coating solution for forming an adhesive layer: Emulsion mixed at a ratio of 50 parts of carnauba emulsion having an average particle diameter of 5.0 μm and 50 parts of water (5) Heat-resistant layer-forming coating solution: Silicone resin solution (6) Manufacturing method: Heat-resistant layer-forming coating solution is coated on the substrate by bar coating, and after drying, a release layer is formed on the opposite substrate surface Coating The coating liquid, the coating liquid for forming the colored layer, and the coating liquid for forming the adhesive layer were sequentially coated by bar coating and dried.

The obtained thermal transfer recording medium had a substrate thickness of 4.5 μm, a release layer coating amount of 1.5 g / m ² , a colored layer coating amount of 2.0 g / m ² , and an adhesive layer coating. The work amount was 1.0 g / m ² , and the coating amount of the heat-resistant layer was 0.3 g / m ² .
This thermal transfer recording medium was evaluated in the same manner as in Example 1.
The results are as shown in Table 2.

< Reference Example 4>
In the same manner as in Example 1, except that the following substrate, release layer forming coating solution, colored layer forming coating solution, adhesive layer forming coating solution, and heat resistant layer forming coating solution were used. A thermal transfer recording medium according to the invention was produced.

(1) Substrate: 4.5 μPET film (2) Release layer forming coating solution: Carnauba emulsion having an average particle size of 0.5 μm (manufactured by Chukyo Yushi Co., Ltd., “Trasol O-102” (solid content 40%)) Emulsion mixed at a ratio of 50 parts to 50 parts of water (3) Colored layer forming coating solution: 15 parts of carnauba wax (solid content 100%), 15 parts of carbon black, and 70 parts of isopropanol were averaged with glass beads of φ1 mm Dispersion pulverized so as to have a particle diameter of 0.1 μm (4) Coating liquid for forming an adhesive layer: Carnauba emulsion having an average particle diameter of 0.5 μm (manufactured by Chukyo Yushi Co., Ltd., “Trasol M-221” (solid content 35%)) Emulsion mixed at a ratio of 50 parts and 50 parts of water (5) Coating solution for forming a heat-resistant layer: Silicone resin solution (6) Production method: Barco coats a coating solution for forming a heat-resistant layer on a substrate After coating and drying, the opposite substrate surface is coated with a release layer forming coating solution, a colored layer forming coating solution, and an adhesive layer forming coating solution, followed by bar coating and drying. Manufactured by.

The obtained thermal transfer recording medium had a substrate thickness of 4.5 μm, a release layer coating amount of 1.5 g / m ² , a colored layer coating amount of 2.0 g / m ² , and an adhesive layer coating. The work amount was 1.0 g / m ² , and the coating amount of the heat-resistant layer was 0.3 g / m ² .
This thermal transfer recording medium was evaluated in the same manner as in Example 1.
The results are as shown in Table 2.

< Reference Example 5>
In the same manner as in Example 1, except that the following substrate, release layer forming coating solution, colored layer forming coating solution, adhesive layer forming coating solution, and heat resistant layer forming coating solution were used. A thermal transfer recording medium according to the invention was produced.

(1) Substrate: 4.5 μPET film (2) Release layer forming coating solution: Carnauba emulsion having an average particle size of 0.5 μm (manufactured by Chukyo Yushi Co., Ltd., “Trasol O-102” (solid content 40%)) Emulsion mixed at a ratio of 50 parts to 50 parts of water (3) Colored layer forming coating solution: 15 parts of carnauba wax (solid content 100%), 15 parts of carbon black, and 70 parts of isopropanol were averaged with glass beads of φ1 mm Dispersion pulverized so as to have a particle size of 50 μm (4) Coating solution for forming an adhesive layer: Carnauba emulsion having an average particle size of 0.5 μm (manufactured by Chukyo Yushi Co., Ltd., “Trasol M-221” (solid content 35% )) Emulsion mixed at a ratio of 50 parts and 50 parts of water (5) Heat-resistant layer-forming coating solution: Silicone resin solution (6) Production method: Heat-resistant layer-forming coating solution on the base material After coating and drying, the coating material for forming the release layer, the coating solution for forming the colored layer, and the coating solution for forming the adhesive layer are sequentially applied and dried by bar coating on the opposite substrate surface. Manufactured by.

The obtained thermal transfer recording medium had a substrate thickness of 4.5 μm, a release layer coating amount of 1.5 g / m ² , a colored layer coating amount of 2.0 g / m ² , and an adhesive layer coating. The work amount was 1.0 g / m ² , and the coating amount of the heat-resistant layer was 0.3 g / m ² .
This thermal transfer recording medium was evaluated in the same manner as in Example 1.
The results are as shown in Table 2.

<Example 6>
In the same manner as in Example 1, except that the following substrate, release layer forming coating solution, colored layer forming coating solution, adhesive layer forming coating solution, and heat resistant layer forming coating solution were used. A thermal transfer recording medium according to the invention was produced.

(1) Substrate: 4.5 μPET film (2) Release layer forming coating solution: Average particle size: Emulsion mixed at a ratio of 50 μm of carnauba emulsion of 0.1 μm and 50 parts of water (3) For forming colored layer Coating liquid: Dispersion obtained by grinding 15 parts of carnauba wax (solid content: 100%), 15 parts of carbon black and 70 parts of isopropanol with glass beads having a diameter of 1 mm to an average particle diameter of 2.0 μm. (4) Adhesive layer Coating liquid for forming: Carnauba emulsion having an average particle size of 0.5 μm (Chukyo Yushi Co., Ltd., “Trasol M-221” (solid content 35%)) and an emulsion mixed at a ratio of 50 parts of water (5) Heat-resistant layer-forming coating solution: Silicone resin solution (6) Manufacturing method: Heat-resistant layer-forming coating solution is coated on the substrate by bar coating, and after drying, a release layer is formed on the opposite substrate surface Coating The coating liquid, the coating liquid for forming the colored layer, and the coating liquid for forming the adhesive layer were sequentially coated by bar coating and dried.

The obtained thermal transfer recording medium had a substrate thickness of 4.5 μm, a release layer coating amount of 1.5 g / m ² , a colored layer coating amount of 2.0 g / m ² , and an adhesive layer coating. The work amount was 1.0 g / m ² , and the coating amount of the heat-resistant layer was 0.3 g / m ² .
This thermal transfer recording medium was evaluated in the same manner as in Example 1.
The results are as shown in Table 2.

< Reference Example 7>
In the same manner as in Example 1, except that the following substrate, release layer forming coating solution, colored layer forming coating solution, adhesive layer forming coating solution, and heat resistant layer forming coating solution were used. A thermal transfer recording medium according to the invention was produced.

(1) Substrate: 4.5 μPET film (2) Peeling layer forming coating solution: Average particle size: emulsion mixed at a ratio of 50 μm carnauba emulsion and 50 parts water (3) Colored layer forming coating Liquid: Dispersion in which 15 parts of carnauba wax (solid content: 100%), 15 parts of carbon black, and 70 parts of isopropanol were pulverized with glass beads having a diameter of 1 mm to an average particle diameter of 2.0 μm. (4) For forming an adhesive layer Coating liquid: Carnauba emulsion having an average particle size of 0.5 μm (Chukyo Oil & Fats Co., Ltd., “Trasol M-221” (solid content 35%)) mixed in a ratio of 50 parts and water 50 parts (5) Heat-resistant layer Coating liquid for forming: Silicone resin liquid (6) Manufacturing method: Coating liquid for forming a heat-resistant layer on the base material by bar coating, drying, and coating for forming a release layer on the opposite base surface Craft The coating liquid for forming a colored layer, the coating liquid for forming a colored layer, and the coating liquid for forming an adhesive layer were sequentially coated by bar coating and dried.

The obtained thermal transfer recording medium had a substrate thickness of 4.5 μm, a release layer coating amount of 1.5 g / m ² , a colored layer coating amount of 2.0 g / m ² , and an adhesive layer coating. The work amount was 1.0 g / m ² , and the coating amount of the heat-resistant layer was 0.3 g / m ² .
This thermal transfer recording medium was evaluated in the same manner as in Example 1.
The results are as shown in Table 2.

<Comparative Example 1>
In the same manner as in Example 1, except that the following substrate, release layer forming coating solution, colored layer forming coating solution, adhesive layer forming coating solution, and heat resistant layer forming coating solution were used. A thermal transfer recording medium according to the invention was produced.

(1) Substrate: 4.5 μPET film (2) Release layer forming coating solution: emulsion mixed in a ratio of 50 parts of 10 μm carnauba emulsion and 50 parts of water (3) Colored layer forming coating solution: carnauba wax Dispersion in which 15 parts of solid content (100%), 15 parts of carbon black and 70 parts of isopropanol were pulverized with glass beads having a diameter of 1 mm to an average particle diameter of 2.0 μm. (4) Adhesive layer forming coating solution: Average particle size: 0.5 μm carnauba emulsion (manufactured by Chukyo Yushi Co., Ltd., “Trasol M-221” (solid content 35%)) and emulsion mixed at a ratio of 50 parts of water (5) Coating for heat-resistant layer formation Liquid: Silicone resin liquid (6) Manufacturing method: Coating liquid for forming a heat-resistant layer on a base material by bar coating, drying, and then coating liquid for forming a release layer on the opposite base surface, coloring Layered The composition coating solution and the adhesive layer forming coating solution were sequentially coated by bar coating and dried.

The obtained thermal transfer recording medium had a substrate thickness of 4.5 μm, a release layer coating amount of 1.5 g / m ² , a colored layer coating amount of 2.0 g / m ² , and an adhesive layer coating. The work amount was 1.0 g / m ² , and the coating amount of the heat-resistant layer was 0.3 g / m ² .
This thermal transfer recording medium was evaluated in the same manner as in Example 1.
The results are as shown in Table 4.

<Comparative Example 2>
In the same manner as in Example 1, except that the following substrate, release layer forming coating solution, colored layer forming coating solution, adhesive layer forming coating solution, and heat resistant layer forming coating solution were used. A thermal transfer recording medium according to the invention was produced.

(1) Substrate: 4.5 μPET film (2) Peeling layer forming coating solution: “TRASOL O-102” (carnauba emulsion (average content: 40% solids) with an average particle size of 0.5 μm) and water 50 (3) Coating liquid for forming a colored layer: 15 parts of carnauba wax (100% solids), 15 parts of carbon black and 70 parts of isopropanol with a glass bead of φ1 mm having an average particle size of 0. Dispersion pulverized so as to have a thickness of 05 μm (4) Coating liquid for forming an adhesive layer: average particle size: 0.5 μm carnauba emulsion (manufactured by Chukyo Yushi Co., Ltd., “Trasol M-221” (solid content 35%)) 50 (5) Heat-resistant layer-forming coating solution: Silicone resin solution (6) Manufacturing method: Heat-resistant layer-forming coating solution on the base material by bar coating After coating and drying, it is manufactured by applying and drying the peeling layer forming coating solution, the colored layer forming coating solution, and the adhesive layer forming coating solution sequentially on the opposite substrate surface by bar coating. did.

The obtained thermal transfer recording medium had a substrate thickness of 4.5 μm, a release layer coating amount of 1.5 g / m ² , a colored layer coating amount of 2.0 g / m ² , and an adhesive layer coating. The work amount was 1.0 g / m ² , and the coating amount of the heat-resistant layer was 0.3 g / m ² .
This thermal transfer recording medium was evaluated in the same manner as in Example 1.
The results are as shown in Table 4.

<Comparative Example 3>
In the same manner as in Example 1, except that the following substrate, release layer forming coating solution, colored layer forming coating solution, adhesive layer forming coating solution, and heat resistant layer forming coating solution were used. A thermal transfer recording medium according to the invention was produced.

(1) Substrate: 4.5 μPET film (2) Release layer forming coating solution: Carnauba emulsion having an average particle size of 0.5 μm (manufactured by Chukyo Yushi Co., Ltd., “Trasol O-102” (solid content 40%)) Emulsion mixed at a ratio of 50 parts to 50 parts of water (3) Colored layer forming coating solution: 15 parts of carnauba wax (solid content 100%), 15 parts of carbon black, and 70 parts of isopropanol were averaged with glass beads of φ1 mm Dispersion pulverized so as to have a particle size of 100 μm (4) Adhesive layer-forming coating solution: Carnauba emulsion having an average particle size of 0.5 μm (manufactured by Chukyo Yushi Co., Ltd., “Trasol M-221” (solid content 35% )) Emulsion mixed at a ratio of 50 parts and 50 parts of water (5) Coating liquid for heat-resistant layer formation: Silicone resin liquid (6) Manufacturing method: Barco After coating and drying, the opposite substrate surface is coated with a release layer forming coating solution, a colored layer forming coating solution, and an adhesive layer forming coating solution, followed by bar coating and drying. Manufactured by.

The obtained thermal transfer recording medium had a substrate thickness of 4.5 μm, a release layer coating amount of 1.5 g / m ² , a colored layer coating amount of 2.0 g / m ² , and an adhesive layer coating. The work amount was 1.0 g / m ² , and the coating amount of the heat-resistant layer was 0.3 g / m ² .
This thermal transfer recording medium was evaluated in the same manner as in Example 1.
The results are as shown in Table 4.

<Comparative Example 4>
In the same manner as in Example 1, except that the following substrate, release layer forming coating solution, colored layer forming coating solution, adhesive layer forming coating solution, and heat resistant layer forming coating solution were used. A thermal transfer recording medium according to the invention was produced.

(1) Substrate: 4.5 μPET film (2) Release layer forming coating solution: Carnauba emulsion having an average particle size of 0.5 μm (manufactured by Chukyo Yushi Co., Ltd., “Trasol O-102” (solid content 40%)) Emulsion mixed at a ratio of 50 parts to 50 parts of water (3) Colored layer forming coating solution: 15 parts of carnauba wax (solid content 100%), 15 parts of carbon black, and 70 parts of isopropanol were averaged with glass beads of φ1 mm Dispersion pulverized so as to have a particle diameter of 2.0 μm (4) Coating liquid for forming an adhesive layer: Emulsion mixed at a ratio of 50 parts of carnauba emulsion having an average particle diameter of 50 μm and 50 parts of water (5) Heat-resistant layer Coating liquid for forming: Silicone resin liquid (6) Manufacturing method: Coating liquid for forming a heat-resistant layer on the base material by bar coating, drying, and coating for forming a release layer on the opposite base surface Craft The coating liquid for forming a colored layer, the coating liquid for forming a colored layer, and the coating liquid for forming an adhesive layer were sequentially coated by bar coating and dried.

The obtained thermal transfer recording medium had a substrate thickness of 4.5 μm, a release layer coating amount of 1.5 g / m ² , a colored layer coating amount of 2.0 g / m ² , and an adhesive layer coating. The work amount was 1.0 g / m ² , and the coating amount of the heat-resistant layer was 0.3 g / m ² .
This thermal transfer recording medium was evaluated in the same manner as in Example 1.
The results are as shown in Table 4.

<Comparative Example 5>
In the same manner as in Example 1, except that the following substrate, release layer forming coating solution, colored layer forming coating solution, adhesive layer forming coating solution, and heat resistant layer forming coating solution were used. A thermal transfer recording medium according to the invention was produced.

1) Substrate: 4.5 μPET film (2) Release layer forming coating solution: Dispersion in which 25 parts of carnauba wax and 75 parts of isopropanol were pulverized with glass beads having a diameter of 1 mm to an average particle diameter of 0.5 μm (3) Colored layer-forming coating solution: carnauba emulsion (manufactured by Chukyo Yushi Co., Ltd., “Trasol M-221” (solid content 35%)) 25 parts and carbon dispersion aqueous solution (Fuji Dye Company) Manufactured by FUJI SP Black 8051) mixed with 25 parts of water and 50 parts of water (4) Adhesive layer forming coating solution: 25 parts of carnauba wax (solid content 100%) and 75 parts of isopropanol on glass beads of φ1 mm Dispersion pulverized to an average particle size of 0.5 μm (5) Heat-resistant layer-forming coating solution: silicone resin solution (6) Production method: base Apply the heat-resistant layer-forming coating solution on the material by bar coating, and after drying, apply the release layer-forming coating solution, the colored layer-forming coating solution, and the adhesive layer-forming coating on the opposite substrate surface. The liquid was manufactured by coating and drying sequentially by bar coating.

The obtained thermal transfer recording medium had a substrate thickness of 4.5 μm, a release layer coating amount of 1.5 g / m ² , a colored layer coating amount of 2.0 g / m ² , and an adhesive layer coating. The work amount was 1.0 g / m ² , and the coating amount of the heat-resistant layer was 0.3 g / m ² .
This thermal transfer recording medium was evaluated in the same manner as in Example 1.
The results are as shown in Table 6.

<Comparative Example 6>
In the same manner as in Example 1, except that the following substrate, release layer forming coating solution, colored layer forming coating solution, adhesive layer forming coating solution, and heat resistant layer forming coating solution were used. A thermal transfer recording medium according to the invention was produced.

1) Substrate: 4.5 μPET film (2) Release layer forming coating solution: Carnauba wax (solid content 100%) 25 parts and isopropanol 75 parts with φ1 mm glass beads, the average particle diameter becomes 0.5 μm (3) Colored layer forming coating solution: 15 parts of carnauba wax (solid content: 100%), 15 parts of carbon black, and 70 parts of isopropanol with glass beads having a diameter of 1 mm and an average particle size of 2.0 μm (4) Adhesive layer-forming coating solution: Dispersion in which 25 parts of carnauba wax and 75 parts of isopropanol were crushed with glass beads having a diameter of 1 mm to an average particle diameter of 0.5 μm ( 5) Coating solution for forming a heat-resistant layer: Silicone resin liquid (6) Manufacturing method: Bar coating with a coating solution for forming a heat-resistant layer on a substrate After coating and drying, the opposite substrate surface is coated with a release layer forming coating solution, a colored layer forming coating solution, and an adhesive layer forming coating solution in sequence by bar coating and drying. Manufactured.

The obtained thermal transfer recording medium had a substrate thickness of 4.5 μm, a release layer coating amount of 1.5 g / m ² , a colored layer coating amount of 2.0 g / m ² , and an adhesive layer coating. The work amount was 1.0 g / m ² , and the coating amount of the heat-resistant layer was 0.3 g / m ² .
This thermal transfer recording medium was evaluated in the same manner as in Example 1.
The results are as shown in Table 6.

<Comparative Example 7>
In the same manner as in Example 1, except that the following substrate, release layer forming coating solution, colored layer forming coating solution, adhesive layer forming coating solution, and heat resistant layer forming coating solution were used. A thermal transfer recording medium according to the invention was produced.

(1) Substrate: 4.5 μPET film (2) Release layer forming coating solution: Carnauba emulsion having an average particle size of 0.5 μm (manufactured by Chukyo Yushi Co., Ltd., “Trasol O-102” (solid content 40%)) Emulsion mixed at a ratio of 50 parts and 50 parts of water (3) Colored layer forming coating solution: Carnauba emulsion with an average particle size of 0.5 μm (manufactured by Chukyo Yushi Co., Ltd., “Trasol M-221” (solid content 35% )) 25 parts of an aqueous dispersion of carbon (FUJI SP Black 8051, manufactured by Fuji Dye Co., Ltd.) mixed in a ratio of 25 parts and 50 parts of water (4) Coating liquid for forming an adhesive layer: average particle size: 0.5 μm Carnauba emulsion (manufactured by Chukyo Yushi Co., Ltd., “Trasol M-221” (solid content 35%)) and an emulsion mixed at a ratio of 50 parts of water (5) Heat-resistant layer forming coating solution: silicone resin solution (6 ) Made Method: Coating the heat-resistant layer-forming coating solution on the substrate by bar coating, drying, and then forming the release layer-forming coating solution, colored layer-forming coating solution and adhesive layer on the opposite substrate surface The coating liquid was manufactured by sequentially coating and drying by bar coating.

The obtained thermal transfer recording medium had a substrate thickness of 4.5 μm, a release layer coating amount of 1.5 g / m ² , a colored layer coating amount of 2.0 g / m ² , and an adhesive layer coating. The work amount was 1.0 g / m ² , and the coating amount of the heat-resistant layer was 0.3 g / m ² .
This thermal transfer recording medium was evaluated in the same manner as in Example 1.
The results are as shown in Table 6.

<Comparative Example 8>
In the same manner as in Example 1, except that the following substrate, release layer forming coating solution, colored layer forming coating solution, adhesive layer forming coating solution, and heat resistant layer forming coating solution were used. A thermal transfer recording medium according to the invention was produced.

(1) Substrate: 4.5 μPET film (2) Release layer forming coating solution: Carnauba wax (solid content 100%) 25 parts and isopropanol 75 parts with φ1 mm glass beads to an average particle diameter of 0.5 μm Dispersion thus ground (3) Colored layer-forming coating solution: 25 parts of Torasol M-221 (carnauba emulsion having an average particle size of 0.5 μm) and a carbon dispersion aqueous solution (FUJI SP Black 8051, manufactured by Fuji Dyeing Co., Ltd.) ) Emulsion mixed at a ratio of 25 parts and 50 parts of water (4) Adhesive layer-forming coating solution: Carnauba emulsion with an average particle size of 0.5 μm (manufactured by Chukyo Yushi Co., Ltd., “Trasol M-221” (solid content 35) %)) Emulsion mixed at a ratio of 50 parts and 50 parts of water (5) Coating solution for forming a heat-resistant layer: Silicone resin solution (6) Production method: For forming a heat-resistant layer on a substrate Apply the coating solution by bar coating, and after drying, apply the coating solution for forming the release layer, the coating solution for forming the colored layer, and the coating solution for forming the adhesive layer to the opposite substrate surface sequentially by bar coating. Manufactured by crafting and drying.

The obtained thermal transfer recording medium had a substrate thickness of 4.5 μm, a release layer coating amount of 1.5 g / m ² , a colored layer coating amount of 2.0 g / m ² , and an adhesive layer coating. The work amount was 1.0 g / m ² , and the coating amount of the heat-resistant layer was 0.3 g / m ² .
This thermal transfer recording medium was evaluated in the same manner as in Example 1.
The results are as shown in Table 6.

Claims (6)

A thermal transfer recording medium in which a release layer, a colored layer and an adhesive layer are formed in this order on a substrate,
The release layer contains a granular heat-meltable material formed from an aqueous emulsion in which particles of a heat-meltable material having an average particle diameter of 0.1 μm to 0.5 μm are dispersed in an aqueous dispersion medium,
The colored layer contains a granular heat-meltable material and a coloring material formed from a dispersion in which particles of a heat-meltable material having an average particle diameter of 1.0 μm to 10 μm are dispersed in an oil-based dispersion medium, and The adhesive layer contains a granular heat-meltable material formed from an aqueous emulsion in which particles of a heat-meltable material having an average particle diameter of 0.1 μm to 0.5 μm are dispersed in an aqueous dispersion medium. , Thermal transfer recording medium.   The thermal transfer recording medium according to claim 1, wherein the release layer contains at least one heat-meltable material selected from the group consisting of carnauba wax, candelilla wax, beeswax, wood wax, and montan wax.   The thermal transfer recording medium according to claim 1, wherein the colored layer contains at least one heat-meltable material selected from the group consisting of carnauba wax, candelilla wax, beeswax, wood wax and montan wax.   The thermal transfer recording medium according to claim 1, wherein the adhesive layer contains at least one heat-meltable material selected from the group consisting of carnauba wax, candelilla wax, beeswax, wood wax, and montan wax.   The thermal transfer recording medium according to claim 1, further comprising a heat-resistant layer on a surface opposite to the surface on which the release layer, the colored layer, and the adhesive layer are formed. A method for producing a thermal transfer recording medium, comprising:
A coating liquid for forming a release layer containing an aqueous emulsion in which particles of a heat-meltable material having an average particle diameter of 0.1 μm to 0.5 μm are dispersed in an aqueous dispersion medium,
Preparing a coating solution for forming a colored layer containing a dispersion in which particles of a heat-meltable material having an average particle diameter of 1.0 μm to 10 μm are dispersed in an oil-based dispersion medium, and a coloring material;
An adhesive layer forming coating solution containing an aqueous emulsion in which particles of a heat-meltable material having an average particle size of 0.1 μm to 0.5 μm are dispersed in an aqueous dispersion medium,
By sequentially coating and drying the release layer forming coating solution, the colored layer forming coating solution and the adhesive layer forming coating solution on the substrate, the release layer and the colored layer are formed on the substrate. And a thermal transfer recording medium comprising an adhesive layer formed in this order.