JP2013193364A - Thermal transfer recording medium - Google Patents

Abstract

The present invention provides a thermal transfer recording medium in which a transfer mark is difficult to read after use and has high confidentiality, and at the same time, the transfer sensitivity at high speed printing is high in both the low density portion and the high density portion.
An intermediate layer and a dye layer are sequentially laminated on a substrate, and the intermediate layer is formed by applying a coating solution for forming an intermediate layer containing carbon fiber and drying it. A thermal transfer recording medium, wherein a ratio of fiber length to fiber diameter (fiber length / fiber diameter) is 10 or more.
[Selection] Figure 1

Description

  The present invention relates to a thermal transfer recording medium used in a thermal transfer printer, and more particularly to a thermal transfer recording medium in which an intermediate layer and a dye layer are sequentially formed on a substrate. More specifically, the present invention relates to a thermal transfer recording medium in which transfer marks are difficult to read after use and have high confidentiality, and at the same time, transfer sensitivity during high-speed printing is high in both low density portions and high density portions.

  In general, a thermal transfer recording medium is an ink ribbon called a thermal ribbon, which is used in a thermal transfer type printer, and has a thermal transfer layer on one side of the substrate and heat resistance on the other side of the substrate. A slipping layer (back coat layer) is provided. Here, the heat-sensitive transfer layer is an ink layer, and the ink is sublimated (sublimation transfer method) or melted (melt transfer method) by heat generated in the thermal head of the printer, and transferred to the transfer target side. is there.

  Currently, among the thermal transfer systems, the sublimation transfer system can easily form full-color images with various functions of the printer, so digital camera self-prints, cards such as identification cards, amusement output, etc. Widely used. Along with the diversification of such applications, there is a growing demand for smaller size, higher speed, lower cost, and durability for the printed material obtained. In recent years, durability has been given to the printed material on the same side of the base sheet. 2. Description of the Related Art Thermal transfer recording media having a plurality of thermal transfer layers provided so as not to overlap protective layers and the like that have been widely used have become quite popular.

  When an image is transferred using the heat-sensitive transfer recording medium, the ink on the heat-sensitive transfer layer is lost or the ink density is lowered due to the ink on the heat-sensitive transfer layer being transferred to the transfer target side. A transfer mark from which the image portion is missing remains in the thermal transfer layer. Then, since it is possible to read an image from a used thermal transfer recording medium, there is a problem that such a thermal transfer recording medium has low security. In particular, when a transparent film is used as the base material of the thermal transfer recording medium, in the used thermal transfer recording medium, not only from the surface on which the thermal transfer layer is formed, but also from the other surface by transmitted light. There is a problem that it is easy to read an image.

  In order to solve such a problem, several methods have been proposed. For example, Patent Document 1 proposes a thermal transfer recording medium capable of erasing a printed image by heating a used portion and melting remaining ink.

  Further, Patent Document 2 makes it difficult to read the printing information remaining on the ink ribbon after printing by mixing a pigment into the substrate and making it difficult to distinguish between the ink on the substrate and the substrate. Thermal transfer ink ribbons have been proposed.

  Patent Document 3 proposes a thermal transfer recording medium in which a metal thin film layer and an intermediate layer that does not transfer with the same color as the ink layer are provided between the support and the ink layer in this order from the support side. ing.

JP 56-053085 A Japanese Patent Laid-Open No. 62-124992 Japanese Patent Laid-Open No. 01-215582

  However, when the thermal transfer recording medium proposed in Patent Document 1 is used, a heater is required in addition to the printer, so that there is a problem that the apparatus becomes complicated and the cost increases. On the other hand, the thermal transfer ink ribbon proposed in Patent Document 2 requires a base material in which a dye is mixed in advance, and there is a problem that the cost also increases. Although the thermal transfer recording medium proposed in Patent Document 3 has no problem in terms of cost, the ink layer, the intermediate layer, and the metal thin film layer overlap each other, so that sufficient confidentiality can be obtained. If the thickness of the intermediate layer is increased, the thermal conductivity of the front and back surfaces of the thermal transfer recording medium becomes insufficient, and as a result, there is a problem that sufficient transfer sensitivity cannot be obtained during high-speed printing. As described above, in the prior art, a thermal transfer recording medium having high confidentiality and at the same time sufficiently high transfer sensitivity during high-speed printing has not been found.

  Therefore, in view of the above problems, the present invention is a thermal transfer recording medium in which it is difficult to read a transfer mark after use and has high confidentiality, and at the same time, the transfer sensitivity during high-speed printing is high in both the low density portion and the high density portion. Is intended to provide.

  The thermal transfer recording medium according to the present invention is formed by sequentially laminating an intermediate layer and a dye layer on a substrate, and the intermediate layer is formed by applying an intermediate layer-forming coating solution containing carbon fiber and drying it. The ratio of the fiber length to the fiber diameter (fiber length / fiber diameter, hereinafter referred to as L / D) of the carbon fiber is 10 or more.

  In the heat-sensitive transfer recording medium according to the present invention, the carbon fiber preferably has a thermal conductivity of 10 W / (m · K) or more.

  Furthermore, in the thermal transfer recording medium according to the present invention, the intermediate layer preferably has a thickness of 0.05 to 2.0 μm.

  The thermal transfer recording medium of the present invention is formed by sequentially laminating an intermediate layer and a dye layer on a substrate, and applying the intermediate layer-forming coating solution containing carbon fiber and drying the intermediate layer. Since the L / D of the carbon fiber is 10 or more, it is low in cost, and it is difficult to read the transfer mark after use and the confidentiality is high. At the same time, the transfer sensitivity at the time of high-speed printing is low and high density. Both concentration parts are high.

Side sectional view of a thermal transfer recording medium according to an embodiment of the present invention

  As shown in FIG. 1, the thermal transfer recording medium of one embodiment of the present invention is provided with a heat-resistant slipping layer 40 that imparts slidability with a thermal head on one surface of the substrate 10. The intermediate layer 20 and the dye layer 30 are sequentially formed on the other surface.

  The substrate 10 is required to have heat resistance and strength not to be softened and deformed by heat pressure in thermal transfer. For example, polyethylene terephthalate, polyethylene naphthalate, polypropylene, cellophane, acetate, polycarbonate, polysulfone, polyimide, polyvinyl alcohol, aromatic polyamide , Synthetic resin films such as aramid and polystyrene, and papers such as condenser paper and paraffin paper can be used alone or in combination. Among these, a polyethylene terephthalate film is preferable in view of physical properties, workability, cost, and the like. The thickness can be in the range of 2 μm or more and 50 μm or less in consideration of operability and workability, but in consideration of handling properties such as transfer suitability and workability, it is 2 μm or more and 9 μm or less. A degree is preferred.

  Moreover, in the base material 10, it is also possible to perform an adhesion treatment on the surface on which the heat resistant slipping layer 40 and / or the intermediate layer 20 is formed. As the adhesion treatment, known techniques such as corona treatment, flame treatment, ozone treatment, ultraviolet treatment, radiation treatment, roughening treatment, plasma treatment, primer treatment, etc. can be applied, and these treatments are used in combination. You can also In the present invention, it is effective to improve the adhesion between the base material and the intermediate layer, and it is preferable to use a primer-treated polyethylene terephthalate film from the viewpoint of cost.

Next, the heat-resistant slipping layer 40 can be handled by a conventionally known layer. For example, a resin serving as a binder, a functional additive that imparts releasability or slipping property, a filler, a curing agent, a solvent, and the like. Can be formed by preparing a coating solution for forming a heat resistant slipping layer, coating and drying. The coating amount after drying of the heat resistant slipping layer 40 is not particularly limited, but is suitably about 0.1 g / m ² or more and 2.0 g / m ² or less.

  Here, the coating amount after drying of the heat resistant slipping layer 40 refers to the solid content remaining after the coating solution for forming the heat resistant slipping layer is applied and dried. Moreover, the coating amount after drying of the dye layer 30 to be described later also refers to the amount of solid content remaining after applying and drying a dye layer forming coating solution to be described later.

  As an example of the heat resistant slipping layer, the binder resin may be polyvinyl butyral resin, polyvinyl acetoacetal resin, polyester resin, vinyl chloride-vinyl acetate copolymer, polyether resin, polybutadiene resin, acrylic polyol, polyurethane acrylate, polyester. Examples thereof include acrylate, polyether acrylate, epoxy acrylate, nitrocellulose resin, cellulose acetate resin, polyamide resin, polyimide resin, polyamideimide resin, polycarbonate resin, polyacrylic resin, and modified products thereof.

  Next, the intermediate layer 20 is formed by applying a coating solution for forming an intermediate layer containing carbon fibers and drying it.

  Since carbon fiber has excellent thermal conductivity, the thermal conductivity of the intermediate layer 20 is increased. As a result, even when the film thickness of the intermediate layer is increased in order to obtain sufficient confidentiality, printing is possible. High transfer sensitivity can be imparted in a low-density portion with small energy. Furthermore, since the L / D of the carbon fiber is 10 or more, preferably 20 or more, a continuous body in which the carbon fibers are in contact with each other is easily formed, and the thermal conductivity of the intermediate layer 20 becomes higher, and the low concentration portion. High transfer sensitivity can be imparted.

  The carbon fiber is not particularly limited as long as L / D is 10 or more, and preferably has a thermal conductivity of 10 W / (m · K) or more, particularly in the length direction. Is preferably 10 W / (m · K) or more. When the thermal conductivity is less than 10 W / (m · K), the thermal conductivity of the intermediate layer cannot be increased, and particularly when the thermal conductivity in the length direction is less than 10 W / (m · K). Is difficult to impart high transfer sensitivity in the low density area.

  The intermediate layer 20 can contain, for example, a binder resin in addition to the carbon fiber. Examples of the binder resin include polyvinyl alcohol, modified polyvinyl alcohol and copolymers, polyvinyl pyrrolidone, modified polyvinyl pyrrolidone and copolymers, starch, gelatin, methyl cellulose, ethyl cellulose, carboxymethyl cellulose, and the like. Among these, polyvinyl alcohol, a modified product or copolymer of polyvinyl alcohol, polyvinyl pyrrolidone, polyvinyl pyrrolidone from the point that the adhesion between the substrate 10 and the dye layer 30 can be improved and a higher printing density can be obtained. A modified product or a copolymer is preferable.

  Further, known additives such as inorganic pigment fine particles, isocyanate compounds, silane coupling agents, dispersants, viscosity modifiers, stabilizers and the like can be used for the intermediate layer 20 as long as the performance is not impaired. .

  When the intermediate layer 20 contains a binder resin or additive other than carbon fiber, the ratio of the carbon fiber is preferably 15% or more of the entire intermediate layer on the basis of the capacity after drying. If the carbon fiber ratio is less than 15%, there is a possibility that an image can be easily read from a used thermal transfer recording medium by transmitted light, and transfer sensitivity at high-speed printing may be insufficient. There is.

  In addition, when using the said binder resin, it is preferable that the content ratio by the mass reference | standard of binder resin and carbon fiber in the intermediate | middle layer 20 is binder resin / carbon fiber = 40 / 60-85 / 15, Furthermore, Is more preferably 50/50 to 80/20.

  The film thickness (after drying) of the intermediate layer 20 is preferably 0.05 μm or more and 2.0 μm or less, and more preferably 0.3 μm or more and 1.0 μm or less. If the film thickness of the intermediate layer 20 is less than 0.05 μm, it may be difficult to sufficiently secure the confidentiality of the used thermal transfer recording medium. On the other hand, if the thickness of the intermediate layer 20 exceeds 2.0 μm, the sensitivity of the heat-sensitive transfer recording medium itself may be lowered, and the transfer sensitivity at high-speed printing may be insufficient.

  Next, the dye layer 30 can be supported by a conventionally known one. For example, a dye layer forming coating solution is prepared by blending a heat transferable dye, a binder, a solvent, and the like, and is applied and dried. It is formed. The dye layer can be composed of a single layer of one color, and a plurality of dye layers containing dyes having different hues can be repeatedly formed on the same surface of the same base material in the surface order.

  The heat transferable dye is a dye that melts, diffuses, or sublimates and transfers by heat. For example, as the yellow component, C.I. I. Solvent Yellow 56, 16, 30, 93, 33, or C.I. I. Disperse Yellow 201, 231, 33 and the like. Examples of the magenta component include C.I. I. Disperse thread 60, C.I. I. Disperse Violet 26, 38, or C.I. I. Solvent red 19, 27, etc. can be mentioned. As the cyan component, C.I. I. Disperse Blue 24, 257, 354, or C.I. I. Solvent blue 36, 63, 266, etc. can be mentioned.

  The binder contained in the dye layer 30 may be any conventionally known resin binder, and is not particularly limited, but cellulose such as ethyl cellulose, hydroxyethyl cellulose, ethyl hydroxy cellulose, hydroxypropyl cellulose, cellulose acetate, etc. And vinyl resins such as polyvinyl resins, polyvinyl alcohol, polyvinyl acetate, polyvinyl acetal, polyvinyl pyrrolidone, polyacrylamide, polyester resins, styrene-acrylonitrile copolymer resins, phenoxy resins, and the like.

  Here, the blending ratio of the heat-transferable dye and the binder on the mass basis when forming the dye layer 30 is preferably heat-transferable dye / binder = 10/100 to 300/100. This is because when the blending ratio of the heat transferable dye / binder is less than 10/100, the dye is too little and the color development sensitivity becomes insufficient, and a good thermal transfer image cannot be obtained. Also, this blending ratio is 300/100. This is because the solubility of the dye in the binder is extremely reduced when the content exceeds 1, the resulting heat-sensitive transfer recording medium has low storage stability and the dye is likely to precipitate.

  The dye layer 30 may contain known additives such as a dispersant, a viscosity modifier, and a stabilizer as long as the performance is not impaired.

The coating amount after drying of the dye layer 30 is not limited in general, but it is 0.3 g / m ² or more from the viewpoint of suppressing abnormal transfer and wrinkling during printing and suppressing cost increase. 1.5 g / m ² or less is appropriate.

  The heat-resistant slipping layer 40, the intermediate layer 20 and the dye layer 30 are each a coating solution for forming a heat-resistant slipping layer, a coating solution for forming an intermediate layer and a coating solution for forming a dye layer. It can be formed by coating with and drying. Examples of the application method include a gravure coating method, a screen printing method, a spray coating method, and a reverse roll coating method.

  Below, the material used for each Example and each comparative example of this invention is shown. In the text, “part” is based on mass unless otherwise specified. Further, the present invention is not limited to these examples.

<Preparation of substrate with heat-resistant slip layer>
As a base material, use a polyethylene terephthalate film with a thickness of 4.5μm on one side, and after drying a coating solution for forming a heat-resistant slipping layer having the following composition on the non-adhesive surface by gravure coating. Was applied at 0.5 g / m ² and dried at 100 ° C. for 1 minute to obtain a substrate with a heat resistant slipping layer.

<Coating liquid for forming heat resistant slipping layer>
Silicon modified acrylic resin (US-350, manufactured by Toagosei Co., Ltd.) 50.0 parts Methyl ethyl ketone 50.0 parts

Example 1
The intermediate layer-forming coating solution-1 having the following composition is applied to the surface of the substrate with a heat-resistant slipping layer by a gravure coating method and dried at 100 ° C. for 2 minutes, so that the film thickness after drying is An intermediate layer of 1.0 μm was formed. Subsequently, a dye layer-forming coating solution-1 having the following composition was applied on the intermediate layer by a gravure coating method so that the coating amount after drying was 0.70 g / m ^2. By drying for a minute, a dye layer was formed, and the thermal transfer recording medium of Example 1 was obtained.

<Intermediate layer forming coating solution-1>
Polyvinyl alcohol (Kuraray Poval PVA-117) 3.0 parts Carbon fiber (L / D = 13, longitudinal thermal conductivity 10 W / (m · K))
0.9 parts pure water 57.7 parts isopropyl alcohol 38.4 parts

<Dye layer forming coating solution-1>
C. I. Solvent Blue 63 (anthraquinone dye) 6.0 parts Polyvinyl acetal 4.0 parts Toluene 45.0 parts Methyl ethyl ketone 45.0 parts

(Example 2)
In the thermal transfer recording medium produced in Example 1, the thermal transfer recording medium of Example 2 was prepared in the same manner as in Example 1 except that the intermediate layer was formed with the intermediate layer forming coating solution-2 having the following composition. Obtained.

<Intermediate layer forming coating solution-2>
Polyvinyl pyrrolidone (N-vinyl-2-pyrrolidone homopolymer)
3.0 parts carbon fiber (L / D = 13, longitudinal thermal conductivity 10 W / (m · K))
0.9 parts pure water 57.7 parts isopropyl alcohol 38.4 parts

(Example 3)
In the thermal transfer recording medium produced in Example 1, the thermal transfer recording medium of Example 3 was prepared in the same manner as in Example 1 except that the intermediate layer was formed with the intermediate layer forming coating solution-3 having the following composition. Obtained.

<Intermediate layer forming coating solution-3>
Polyvinyl alcohol (Kuraraypoval PVA-117) 3.0 parts Carbon fiber (L / D = 22, longitudinal thermal conductivity 10 W / (m · K))
0.9 parts pure water 57.7 parts isopropyl alcohol 38.4 parts

Example 4
In the thermal transfer recording medium produced in Example 1, the thermal transfer recording medium of Example 4 was prepared in the same manner as in Example 1 except that the intermediate layer was formed with the intermediate layer forming coating solution-4 having the following composition. Obtained.

<Intermediate layer forming coating solution-4>
Polyvinyl alcohol (Kuraraypoval PVA-117) 3.0 parts Carbon fiber (L / D = 13, longitudinal thermal conductivity 5 W / (m · K))
0.9 parts pure water 57.7 parts isopropyl alcohol 38.4 parts

(Example 5)
The thermal transfer recording medium of Example 5 was prepared in the same manner as in Example 1 except that the intermediate layer was formed so that the film thickness after drying was 0.03 μm in the thermal transfer recording medium produced in Example 1. Obtained.

(Example 6)
The thermal transfer recording medium of Example 6 was prepared in the same manner as in Example 1 except that the intermediate layer was formed so that the film thickness after drying was 2.2 μm in the thermal transfer recording medium produced in Example 1. Obtained.

(Comparative Example 1)
In the thermal transfer recording medium produced in Example 1, a thermal transfer recording medium of Comparative Example 1 was obtained in the same manner as in Example 1 except that no intermediate layer was formed.

(Comparative Example 2)
In the thermal transfer recording medium produced in Example 1, the thermal transfer recording medium of Comparative Example 2 was prepared in the same manner as in Example 1 except that the intermediate layer was formed with the intermediate layer forming coating solution-5 having the following composition. Obtained.

<Intermediate layer forming coating solution-5>
Polyvinyl alcohol (Kuraraypoval PVA-117) 3.9 parts Pure water 57.7 parts Isopropyl alcohol 38.4 parts

(Comparative Example 3)
In the thermal transfer recording medium produced in Example 1, the thermal transfer recording medium of Comparative Example 3 was prepared in the same manner as in Example 1 except that the intermediate layer was formed with the intermediate layer forming coating solution-6 having the following composition. Obtained.

<Intermediate layer forming coating solution-6>
Polyvinyl alcohol (Kuraray Poval PVA-117) 3.0 parts Carbon fiber (L / D = 5, longitudinal thermal conductivity 10 W / (m · K))
0.9 parts pure water 57.7 parts isopropyl alcohol 38.4 parts

(Comparative Example 4)
In the thermal transfer recording medium produced in Example 1, the thermal transfer recording medium of Comparative Example 4 was prepared in the same manner as in Example 1 except that the intermediate layer was formed with the intermediate layer forming coating solution-7 having the following composition. Obtained.

<Intermediate layer forming coating solution-7>
Polyvinyl alcohol (Kuraray Poval PVA-117) 3.0 parts Mica (L / D = 20, longitudinal thermal conductivity 0.5 W / (m · K))
0.9 parts pure water 57.7 parts isopropyl alcohol 38.4 parts

<Preparation of transfer object>
A white foamed polyethylene terephthalate film having a thickness of 188 μm is used as a substrate, and an application layer-forming coating solution having the following composition is applied on one surface thereof by a gravure coating method to a coating amount after drying of 5.0 g / m ^2. The material to be transferred for thermal transfer was prepared by applying and drying.

<Image-receiving layer forming coating solution>
Vinyl chloride-vinyl acetate-vinyl alcohol copolymer 19.5 parts Amino-modified silicone oil 0.5 part Toluene 40.0 parts Methyl ethyl ketone 40.0 parts

<Print evaluation>
Using the heat-sensitive transfer recording media of Examples 1 to 6 and Comparative Examples 1 to 4, solid printing was performed with a thermal simulator (manufactured by Wedge Co., Ltd.), and each gradation obtained by dividing 255 gradations, the highest reflection density, into 11 parts The reflection density was evaluated. The results are shown in Table 2. The transfer sensitivity in the low density area was evaluated by the reflection density at 23 to 93 gradations, and the transfer sensitivity in the high density area was evaluated by the reflection density at 255 gradations. The reflection density is a value measured with a spectral densitometer “X-Rite 528” (manufactured by X-Rite Co., Ltd.).

The printing conditions are as follows.
Printing environment: 23 ° C, 50% RH
Applied voltage: 29V
Line cycle: 0.7msec
Print density: main scanning 300 dpi, sub-scanning 300 dpi

<Evaluation of confidentiality of used thermal transfer recording media>
Using the thermal transfer recording media of Examples 1 to 6 and Comparative Examples 1 to 4, the C component was printed out of the color images of the human face image separated into YMC components using the thermal simulator. The heat-sensitive transfer recording medium after printing was visually observed using transmitted light from a fluorescent lamp, and the confidentiality was evaluated according to the following evaluation criteria. The results are shown in Table 1.
○: The type of image printed cannot be determined. Δ: The face image printed can be determined, but the type of person cannot be determined. ×: The face image of the printed person can be easily determined. If it is above, it is a level which is satisfactory practically.

  From the results shown in Tables 1 and 2, the thermal transfer recording media of Examples 1 to 3 clearly have a transfer sensitivity at the time of high-speed printing as compared with the thermal transfer recording medium of Comparative Example 1 in which no intermediate layer is provided. It was found that both the low density part and the high density part were high, and the used heat-sensitive transfer recording medium was also highly confidential.

  In particular, in the thermal transfer recording medium of Example 3, the intermediate layer is formed using carbon fibers having an L / D of 22, so the thermal transfer recording medium of Example 1 using the carbon fibers having an L / D of 13 is used. The transfer sensitivity at the low density portion is further increased as compared with FIG.

  In the heat-sensitive transfer recording medium of Example 4, the intermediate layer is formed using carbon fibers having a slightly small length direction thermal conductivity of 5 W / (m · K). In comparison, it can be seen that the transfer sensitivity of the low density portion is slightly lowered.

  In the thermal transfer recording medium of Example 5, the film thickness of the intermediate layer is a little as small as 0.03 μm. Therefore, compared with the thermal transfer recording medium of Example 1, the confidentiality of the used thermal transfer recording medium is slightly higher. It turns out that it has fallen.

  The thermal transfer recording medium of Example 6 has a slightly larger intermediate layer thickness of 2.2 μm, so that the transfer sensitivity of the low density portion is slightly lower than that of the thermal transfer recording medium of Example 1. I understand.

  On the other hand, since the thermal transfer recording medium of Comparative Example 2 forms an intermediate layer without using carbon fibers, the transfer sensitivity is significantly lower than that of the thermal transfer recording medium of Example 1, It was found that an image can be easily discriminated by using transmitted light, and the used thermal transfer recording medium is inferior in confidentiality.

  In the thermal transfer recording medium of Comparative Example 3, since the intermediate layer is formed using carbon fiber, the confidentiality is good, but the L / D of the carbon fiber is less than 10, so A continuous body due to the contact between the carbon fibers is not formed. As a result, the transfer sensitivity of the low density portion is lower than that of the thermal transfer recording medium of Comparative Example 1 in which the intermediate layer is not formed, and the L / D is 10 or more. It turns out that carbon fiber is needed.

  In the heat-sensitive transfer recording medium of Comparative Example 4, although an intermediate layer was formed using an additive having an L / D of 10 or more, since this additive is mica, the transfer sensitivity of the low density portion formed the intermediate layer. It was lower than the thermal transfer recording medium of Comparative Example 1 that was not used. Also, compared with the thermal transfer recording media of Examples 1 to 6 in which the intermediate layer is formed using carbon fiber, the used thermal transfer recording medium is inferior in confidentiality, so the intermediate layer is formed using carbon fiber. It turns out that it needs to be formed.

  The thermal transfer recording medium obtained by the present invention can be used in a sublimation transfer type printer, and in combination with high speed and high functionality of the printer, various images can be easily formed in full color. Can be widely used for cards such as identification cards, amusement output, etc.

10 Base Material 20 Intermediate Layer 30 Dye Layer 40 Heat-resistant Sliding Layer

Claims (3)

An intermediate layer and a dye layer are sequentially laminated on the substrate,
The intermediate layer is formed by applying and drying an intermediate layer forming coating solution containing carbon fiber, and the ratio of fiber length to fiber diameter (fiber length / fiber diameter) of the carbon fiber is 10 or more. A thermal transfer recording medium, characterized in that   The thermal transfer recording medium according to claim 1, wherein the thermal conductivity of the carbon fiber is 10 W / (m · K) or more.   The thermal transfer recording medium according to claim 1, wherein the intermediate layer has a thickness of 0.05 to 2.0 μm.

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