JP2010158802A - Sublimable thermal transfer medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sublimable thermal transfer medium which exhibits good color reproducibility during printing, has excellent storage stability and light fastness, and is almost free from dye migration. <P>SOLUTION: This sublimable thermal transfer medium has a heat-resistant resin layer formed on the back of a base material, and also has, on the other face, at least, dye layers of yellow, magenta, and cyan which contain a sublimable dye in a binder resin. The binder resin of the dye layer contains a polyvinyl alcohol component in the ratio of 5-20 mass% to the total resin content, the sublimable dye of the cyan dye layer contains an acetamide derivative dye in the ratio of ≥30 mass% to the total dye content, and the sublimable dye of the yellow layer contains a bispyrazolone-based dye in the ratio of ≥40 mass% to the total dye content. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a sublimation type thermal transfer medium that performs full-color printing, and relates to a sublimation type thermal transfer medium that is excellent in stability over time and color reproducibility during printing.

  In general, a sublimation type thermal transfer medium is called a thermal ribbon, and is an ink ribbon used in a thermal transfer type printer. A heat-resistant resin layer (back coat layer) is formed on one surface of a substrate, A dye layer (thermal transfer layer) is provided on the other surface. Here, the dye layer is an ink layer, and the ink is sublimated (sublimation transfer method) or melted (melt transfer method) by the heat generated in the thermal head of the printer, and transferred to the transfer target side. .

  At present, the thermal transfer system can easily form various images in combination with higher functionality of a printer, so that it is widely used for amusement output including cards such as identification cards. In this way, with the diversification of applications, there is a growing demand for durability on the obtained printed matter, and in recent years, the sensitivity of thermal ribbons has been increased to increase the number of images to be printed and to increase the speed of printers.

  A protective layer is formed for the purpose of protecting the printed matter after the dye is fixed when the dye of the sublimation thermal ribbon is transferred and fixed to an image forming body called image receiving paper by the printer. The protective layer is provided for the purpose of various resistances, one of which includes the purpose of imparting water resistance. In this way, the water resistance of the printed material can be imparted by the protective layer, but in order to improve the water resistance of the sublimation thermal ribbon, it is necessary to impart it by the material of the ribbon.

  For example, Patent Document 1 describes a dye layer composed of a polyvinyl butyral resin in which the weight of the vinyl alcohol portion of the resin is 10 to 40%.

  By having a vinyl alcohol component, a high-sensitivity color image can be obtained with high thermal sensitivity. Although it is said that there is no change with time even after long-term storage, it is difficult to say that the hydroxyl group of polyvinyl alcohol has high affinity with moisture and excellent storage stability in a high-temperature and high-humidity state.

  For the purpose of obtaining a thermal transfer recording having excellent light resistance and high density, Patent Document 2 describes a combination of a bispyrazolomethine yellow dye and an indophenol cyan dye as a dye. That is, a thermal transfer sheet is used in which one colorant layer contains an indophenol cyan dye and at least one other colorant layer contains a bispyrazolone methine yellow dye.

These combinations can provide sufficient light resistance, but indophenol cyan dyes have poor storage stability and are not practical ribbons.
Japanese Patent Publication No. 7-51387 Japanese Patent No. 395427

  The present invention has been made in view of such circumstances, and can provide a water-resistant dye layer without deteriorating the printing sensitivity, and further provide a sublimation thermal ribbon having good light resistance. Objective.

  The present invention has been made to solve the above-mentioned problems, and the invention according to claim 1 is a yellow resin comprising a heat-resistant resin layer on the back surface of a substrate and a sublimable dye in the binder resin on the other surface. In the sublimation type thermal transfer medium provided with at least a magenta and cyan dye layer, the binder resin of the dye layer contains a polyvinyl alcohol component in a resin ratio of 5% by mass to 20% by mass, and the sublimable dye of the cyan dye layer is a dye. A sublimation-type thermal transfer medium comprising an acetamide derivative dye in a ratio of 30% by mass or more and a sublimation dye in a yellow layer containing a bispyrazolone dye having a dye ratio of 40% by mass or less.

  In the invention according to claim 2 of the present invention, the resin contained in the dye layer contains a polyvinyl alcohol component as a main resin in a resin ratio of 5% by mass to 20% by mass, and reacts with the main resin as a sub resin. 2. The sublimation thermal transfer medium according to claim 1, wherein a resin chemically bonded to the —OH group of the polyvinyl alcohol component of the main resin is used.

  The invention according to claim 3 of the present invention is the sublimation type thermal transfer medium according to claim 1 or 2, wherein the molecular weight of the acetamide derivative dye contained in the cyan dye layer in the dye layer is 500 or less. is there.

  The invention according to claim 4 of the present invention is the sublimation thermal transfer medium according to any one of claims 1 to 3, wherein the dye layer contains a release agent.

  According to the present invention, the binder resin of the dye layer contains a polyvinyl alcohol component in a resin ratio of 5% by mass or more and 20% by mass or less. , It can prevent the dissolution of the dye by moisture.

  Furthermore, the resin contained in the dye layer contains a polyvinyl alcohol component as a main resin in a resin ratio of 5% by mass or more and 20% by mass or less, and reacts with the main resin as a secondary resin to become a polyvinyl alcohol component of the main resin. By using a resin that is chemically bonded to the —OH group, it is possible to provide the thermal ribbon in which the above effect becomes more remarkable and the thermal ribbon and the transfer target are not fused at the time of printing.

  According to the present invention, the sublimation dye of the cyan dye layer contains an acetamide derivative dye having a dye ratio of 30% by mass or more, and the sublimation dye of the yellow layer contains a bispyrazolone dye having a dye ratio of 40% by mass or less. Can provide a ribbon and a printed matter having excellent light resistance. When the molecular weight of the acetamide derivative dye contained in the cyan dye layer is 500 or less, a high-concentration dye layer ink with a stable ink state can be obtained. Furthermore, the effect of preventing fusion can be enhanced by including a release agent in the dye layer.

  Hereinafter, an embodiment of a sublimation type thermal transfer medium of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic plan view of an example of a sublimation type thermal transfer medium of the present invention. 2 is a schematic cross-sectional view taken along the line XY of FIG. 1 of the sublimation type thermal transfer medium of the present invention, and shows an example of a sublimation type thermal transfer medium used in a thermal transfer type printer.

As shown in FIGS. 1 and 2, the sublimation type thermal transfer medium of the present invention has three colors of yellow (Y), magenta (M), cyan (C) or black (BK) on one surface of the substrate (1). ) Containing the four-color dye layer (4) in the longitudinal direction in the surface order and the heat-resistant resin layer (2) on the other surface of the substrate (1).

  The base material (1) of the sublimation type thermal transfer medium is required to have heat resistance and strength that is not softened and deformed by heat pressure in thermal transfer. For example, polyethylene terephthalate, polyethylene naphthalate, polypropylene, cellophane, acetate, polycarbonate, polysulfone, polyimide , Synthetic resin films such as polyvinyl alcohol, aromatic polyamide, aramid, polystyrene, etc., and papers such as condenser paper and paraffin paper can be used alone or in combination. In view of processability and cost, a polyethylene terephthalate film is preferable. In addition, the thickness is in the range of 2 to 50 μm in consideration of operability and workability, but in consideration of handling properties such as transfer suitability and workability, the thickness is about 2 to 12 μm. preferable.

  The heat-resistant resin layer (2) is composed of, for example, a functional additive that imparts releasability and slipperiness, and a binder, and can be cured with a curing agent as necessary. The thickness of the heat resistant resin layer is suitably about 0.1 to 2 μm (dry thickness).

  Examples of heat-resistant resin layers include acrylic oligomer UV-cured products, polyesters, polyurethanes, polyacetals, polyamides, polyimides, and other synthetic resins with silicone oil and other release agents added, and silicones copolymerized. Can be mentioned. Moreover, even if it adds a filler as needed, there is no problem, and examples of the filler to be added include silicone powder, silica, and various resin powders.

  As the protective layer (3) for protecting the printed image, durability is required to protect the image formed on the transferred material by the dye layer (4) from ultraviolet rays and the like, and at the same time, the image is transferred by a process called a thermal transfer method. Because it needs to be formed on the body, it has an inherent performance as a protective layer such as UV absorption, and at the same time has an adhesion to the transfer target, and it is easily peeled off from the base material at the time of thermal transfer. Generally, it is formed of a laminate of a plurality of layers such as a release layer.

  The protective layer (3) is composed of, for example, a functional additive such as an ultraviolet absorber and a binder, and the thickness is suitably about 1 to 5 μm (dry thickness).

  Examples of functional additives for the protective layer (3) include benzophenone, benzotriazole, benzoate, UV absorbers typified by triazines, light stabilizers typified by hindered amines, and hindered phenols. And antioxidants, fluorescent brighteners, antistatic agents and the like. In addition, the binder is not particularly limited except for heat melting property. For example, styrene resins such as polystyrene and poly α-methylstyrene, acrylic resins such as polymethyl methacrylate and polyethyl acrylate. Resin, polyvinyl chloride, polyvinyl acetate, vinyl chloride-vinyl acetate copolymer, polyvinyl resins such as polyvinyl butyral, polyvinyl acetal, polyester resin, polyamide resin, epoxy resin, polyurethane resin, petroleum resin, ionomer, ethylene-acrylic Synthetic resins such as acid copolymer, ethylene-acrylic acid ester copolymer, cellulose derivatives such as nitrocellulose, ethyl cellulose, cellulose acetate propionate, rosin, rosin-modified maleic acid resin, ester gum, polyisobutylene rubber, butyl rubber , Styrene - acrylonitrile rubbers, natural resins and derivatives of synthetic rubber polychlorinated olefins such as carnauba wax, waxes such as paraffin wax - butadiene rubber, butadiene. Among these, acrylic resins, polyesters, and epoxy resins are preferable.

  The release layer imparting the release function for forming the protective layer (3) is composed of, for example, a functional additive that imparts releasability and slipperiness, and a binder, and the thickness of this release layer is 0.3 to 3 μm. The degree (dry thickness) is appropriate.

  Examples of functional additives used in the release layer include silicone oils, release agents typified by phosphate esters, waxes, slip agents typified by resin fillers, UV absorbers, light stabilizers, and antioxidants. Agents, fluorescent brighteners, antistatic agents and the like. In addition, the binder is not particularly limited except for heat melting property. For example, styrene resins such as polystyrene and poly α-methylstyrene, acrylic resins such as polymethyl methacrylate and polyethyl acrylate. Resin, polyvinyl chloride, polyvinyl acetate, vinyl chloride-vinyl acetate copolymer, polyvinyl resins such as polyvinyl butyral, polyvinyl acetal, polyester resin, polyamide resin, epoxy resin, polyurethane resin, petroleum resin, ionomer, ethylene-acrylic Synthetic resins such as acid copolymer, ethylene-acrylic acid ester copolymer, cellulose derivatives such as nitrocellulose, ethyl cellulose, cellulose acetate propionate, rosin, rosin-modified maleic acid resin, ester gum, polyisobutylene rubber, butyl rubber , Styrene - acrylonitrile rubbers, natural resins and derivatives of synthetic rubber polychlorinated olefins such as carnauba wax, waxes such as paraffin wax - butadiene rubber, butadiene. Among these, acrylic resins and cellulose derivatives are preferable.

  The dye layer (4) of the sublimation type thermal transfer medium is composed of, for example, a heat sublimable dye and a binder resin, and the thickness of this dye layer is suitably about 1 μm (dry thickness).

  As the sublimation dye used in the dye layer (4), a sublimation disperse dye is preferable. As the cyan component, a dye which is an acetamide derivative is at least 30% by mass or more of the dye composition ratio. It is preferably included. A dye composed of an acetamide derivative has a relatively low solubility in water and is contained in an amount of 30% by mass or more, so that the dye tends to be hydrophobic and water resistance in a humid state is improved. Further, since the acetamide derivative has a low solubility in a general-purpose solvent such as methyl ethyl ketone or toluene, which is a solvent of the ink, when it is made into an ink, 60% by mass or less is an achievable addition amount when constituting the ink.

  Further, as the cyan component, C.I. I. Disperse Blue 354, C.I. I. Solvent Blue 63, C.I. I. Solvent Blue 36, or C.I. I. Disperse Blue 24 and the like.

  As the yellow component, as the sublimable dye, a yellow layer containing a bispyrazolone dye having a dye ratio of 40% by mass or less can be used. Since the printing sensitivity of bispyrazolone dyes is reduced, when dealing with high-speed printing, it is appropriate that the yellow dye ratio is 40% by mass or less, and if this amount is included, sufficient light resistance can be obtained.

  Other yellow dyes include Solvent Yellow 56, 16, 30, 93, 33, 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, C.I. I. Solvent Red 27, or C.I. I. Solvent Red 19 etc. are mentioned. Further, as the ink dye, it is common to perform color matching by combining the above dyes.

As the binder resin used for the dye layer (4), a resin containing a polyvinyl alcohol component in a resin ratio of 5% by mass to 20% by mass is used. Here, what is called a polyvinyl alcohol component is an —OH group (hydroxyl group), and typical resins include polyvinyl butyral and polyvinyl acetal resin. When these resins are synthesized into polyvinyl acetal resin or the like by aldehyde conversion of the —OH group of polyvinyl alcohol, at least about 5 mass% of —OH groups remain in the resin. In addition, if the aldehyde formation is stopped halfway, the amount of —OH groups in the resin increases accordingly, but the —OH groups have excellent affinity with water, resulting in poor water resistance in humid environments. The resin ratio of 5% by mass to 20% by mass is suitable for the substantial —OH group. Furthermore, the —OH group can be chemically bonded with various reactive resins to improve water resistance.

  By mixing with a resin other than these resins, a dye layer suitable for a sublimation thermal ribbon can be formed. Examples of the resin used in this case include cellulose resins such as ethyl cellulose, hydroxyethyl cellulose, ethyl hydroxy cellulose, hydroxypropyl cellulose, methyl cellulose, and cellulose acetate, polyvinyl alcohol, polyvinyl acetate, polyvinyl butyral, polyvinyl acetal, polyvinyl pyrrolidone, and polyacrylamide. Such as vinyl resins, polyester resins, styrene-acrylonitrile copolymer resins, phenoxy resins, and the like. Furthermore, reactive resins such as phenol, melamine, epoxy, isocyanate, and glyoxal resin are used as the curable resin.

  Here, the ratio of the dye and the binder resin in the dye layer (4) is preferably dye / binder resin = 10/100 to 300/100. This is because when the ratio of the dye / binder resin is less than 10/100, the amount of dye is too small and the color development sensitivity is insufficient and a good thermal transfer image cannot be obtained, and when this ratio exceeds 300/100, This is because the solubility of the dye in the binder resin is extremely lowered, so that the storage stability of the dye layer is deteriorated and the dye is likely to be precipitated.

Hereinafter, although an Example is described in detail, this invention is not limited to an Example. Example 1
Using a polyester film having a thickness of 4.5 μm as a base material, a heat-resistant resin layer was obtained by forming a heat-resistant resin layer ink with a dry thickness of 0.8 μm on one surface of the base material by a gravure coating method. . After forming the release layer with a dry thickness of 0.8 μm on the other surface using the release layer forming ink, the adhesive layer is formed on the release layer with the dry layer thickness of 2.0 μm using the adhesive layer forming ink. Forming a protective layer. Next, dye layers are formed in a sequential order with a dry thickness of 1.0 μm using a dye layer forming yellow ink, a dye layer forming magenta ink, and a dye layer forming cyan ink, which are prepared in predetermined positions. A thermal transfer medium was prepared.

<Ink for heat-resistant resin layer>
Epoxy acrylate 45.0 parts Hexanediol diacrylate 20.0 parts Initiator 1.0 part Silicone oil 6.0 parts Silica 3.0 parts Methyl alcohol 25.0 parts <Ink for release layer formation>
Acrylic resin 18.0 parts Polyester resin 1.0 part Polyethylene powder 1.0 part Toluene 40.0 parts Methyl ethyl ketone 40.0 parts <Adhesive layer forming ink>
Acrylic resin 10.0 parts Polyester resin 5.0 parts Epoxy resin 5.0 parts Benzophenone UV absorber 5.0 parts Toluene 35.0 parts Methyl ethyl ketone 40.0 parts <Dye layer forming yellow ink>
Bispyrazolone dye 1.0 part C.I. I. Solvent Yellow 16 3.0 parts Polyvinyl alcohol resin 1.0 part Polyvinyl acetate resin 4.0 parts Tetrahydrofuran 60.0 parts Toluene 31.0 parts <Magenta ink for forming dye layer>
C. I. Disperse thread 60 1.5 parts C.I. I. Disperse Violet 26 1.5 parts Polyvinyl alcohol resin 1.0 part Polyvinyl acetate resin 4.0 parts Tetrahydrofuran 60.0 parts Toluene 32.0 parts <Cyan ink for dye layer formation>
Acetamide derivative 1.2 parts C.I. I. Solvent Blue 63 1.8 parts Polyvinyl alcohol resin 1.0 part Polyvinyl acetate resin 4.0 parts Tetrahydrofuran 60.0 parts Toluene 32.0 parts (Example 2)
A sublimation thermal transfer medium was prepared in the same manner as in Example 1 except that the ink having the following composition was used as the dye layer forming ink.

<Dye layer forming yellow ink>
Bispyrazolone dye 1.0 part C.I. I. Solvent Yellow 16 3.0 parts Polyacetal resin (-OH group 12% by mass) 5.0 parts Tetrahydrofuran 60.0 parts Toluene 31.0 parts <Magenta ink for forming dye layer>
C. I. Disperse thread 60 1.5 parts C.I. I. Disperse Violet 26 1.5 parts Polyacetal resin (-OH group 12% by mass) 5.0 parts Tetrahydrofuran 60.0 parts Toluene 32.0 parts <Cyan ink for dye layer formation>
Acetamide derivative 1.2 parts C.I. I. Solvent Blue 63 1.8 parts Polyacetal resin (-OH group 12% by mass) 5.0 parts Tetrahydrofuran 60.0 parts Toluene 32.0 parts (Example 3)
A sublimation thermal transfer medium was prepared in the same manner as in Example 1 except that the ink having the following composition was used as the dye layer forming ink.

<Dye layer forming yellow ink>
Bispyrazolone dye 1.0 part C.I. I. Solvent Yellow 93 3.0 parts Polyacetal resin (-OH group 20% by mass) 3.5 parts Hexamethylene diisocyanate 1.5 parts Tetrahydrofuran 60.0 parts Toluene 31.0 parts <Magenta ink for dye layer formation>
C. I. Disperse thread 60 1.5 parts C.I. I. Disperse Violet 26 1.5 parts Polyacetal resin (-OH group 20% by mass) 3.5 parts Hexamethylene diisocyanate 1.5 parts Tetrahydrofuran 60.0 parts Toluene 32.0 parts <Cyan ink for dye layer formation>
Acetamide derivative 1.2 parts C.I. I. Solvent Blue 63 1.8 parts Polyacetal resin (-OH group 20% by mass) 3.5 parts Hexamethylene diisocyanate 1.5 parts Tetrahydrofuran 60.0 parts Toluene 32.0 parts (Comparative Example 1)
A sublimation thermal transfer medium was prepared in the same manner as in Example 1 except that the ink having the following composition was used as the dye layer forming ink.

<Dye layer forming yellow ink>
C. I. Solvent Yellow 93 3.0 parts C.I. I. Solvent Yellow 16 1.0 part Polyacetal resin (-OH group 30% by mass) 5.0 parts Tetrahydrofuran 60.0 parts Toluene 31.0 parts <Magenta ink for forming dye layer>
C. I. Disperse thread 60 1.5 parts C.I. I. Disperse Violet 26 1.5 parts Polyacetal resin (-OH group 30% by mass) 5.0 parts Tetrahydrofuran 60.0 parts Toluene 32.0 parts <Cyan ink for dye layer formation>
Acetamide derivative 1.2 parts C.I. I. Solvent Blue 63 1.8 parts Polyacetal resin (-OH group 30% by mass) 5.0 parts Tetrahydrofuran 60.0 parts Toluene 32.0 parts (Comparative Example 2)
A sublimation thermal transfer medium was prepared in the same manner as in Example 1 except that the ink having the following composition was used as the dye layer forming ink.

<Dye layer forming yellow ink>
C. I. Solvent Yellow 93 3.0 parts C.I. I. Solvent Yellow 16 1.0 part Polyacetal resin (-OH group 20% by mass) 3.5 parts Hexamethylene diisocyanate 1.5 parts Tetrahydrofuran 60.0 parts Toluene 31.0 parts <Magenta ink for dye layer formation>
C. I. Disperse thread 60 1.5 parts C.I. I. Disperse Violet 26 1.5 parts Polyacetal resin (-OH group 20% by mass) 3.5 parts Hexamethylene diisocyanate 1.5 parts Tetrahydrofuran 60.0 parts Toluene 32.0 parts <Cyan ink for dye layer formation>
Acetanilide derivative (water solubility 0.1% by mass) 1.2 parts C.I. I. Solvent Blue 63 1.8 parts Polyacetal resin (-OH group 20% by mass) 3.5 parts Hexamethylene diisocyanate 1.5 parts Tetrahydrofuran 60.0 parts Toluene 32.0 parts The following materials were used as printing materials for printing. .

<Preparation of transfer object>
By forming a sublimation heat transfer image-receiving layer with a dry thickness of 5.0 μm on one surface of the substrate to be transferred using a gravure coating method, a transfer substrate for sublimation heat transfer is formed. The body was made.

<Transfer material>
Foamed polyester film: 188μm thick
<Sublimation thermal transfer image-receiving layer forming ink>
Vinyl chloride-vinyl acetate-vinyl alcohol copolymer 20.0 parts Silicone oil 0.5 part Toluene 40.0 parts Methyl ethyl ketone 39.5 parts <Print and print evaluation>
The sublimation type thermal transfer media obtained in Examples and Comparative Examples were printed with ISO SCID images under the conditions shown in Table 1 using a thermal simulator in combination with a transfer medium, and each print was obtained. Moreover, it preserve | saved at 40 degreeC90% RH for 48 hours as high temperature and humidity conditions, and the state of the ribbon was confirmed. For light resistance evaluation, a fading test was carried out with xenon light for 50 hours.

前記実施例および比較例で作成した昇華型熱転写媒体について、印画評価並びに、染料の移行性、耐光性に関して評価を行った。その結果を表２に記載する。

The sublimation type thermal transfer media prepared in the above Examples and Comparative Examples were evaluated for printing evaluation, dye transferability, and light resistance. The results are listed in Table 2.

なお、評価は○×にて評価したが、○は目的とする性能が実現されたことを意味し、×は実用に耐えないことを意味する。

In addition, although evaluation was evaluated by ◯ ×, ◯ means that the intended performance was realized, and × means that it was not practically usable.

  According to the evaluation results of the examples and comparative examples, the sublimation type thermal transfer medium of the present invention was in a state where the printing could withstand practical use, and even when stored under high temperature and high humidity conditions, the dye did not dissolve or migrate. Further, in the light resistance test, the sublimation type thermal transfer medium of the example was good with almost no cyan fading. On the other hand, Comparative Example 1 had poor print sensitivity and a low print density. In Comparative Example 2, when stored under high temperature and high humidity conditions, the cyan dye was dissolved and the dye was lost. As a result, it was impossible to print.

  As described above, according to the present invention, even if the ribbon is stored for a long time in a humid state, it is possible to prevent migration of the dye in the dye layer, and further, a sublimation type thermal transfer medium having good color reproducibility at the time of printing. It was possible to provide.

It is a plane schematic diagram of an example of a sublimation type thermal transfer medium of the present invention. It is a cross-sectional schematic diagram in XY of FIG. 1 of the sublimation type thermal transfer medium of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Base material 2 ... Heat resistant resin layer 3 ... Protective layer 4 ... Dye layer

Claims (4)

  In the sublimation type thermal transfer medium having a heat-resistant resin layer on the back surface of the substrate and at least a yellow, magenta and cyan dye layer containing a sublimation dye in the binder resin on the other surface, the binder resin of the dye layer is polyvinyl alcohol. Ingredients are contained in a resin ratio of 5% by mass or more and 20% by mass or less, and the sublimable dye in the cyan dye layer contains an acetamide derivative dye in a dye ratio of 30% by mass or more, and the sublimable dye in the yellow layer has a dye ratio of 40% by mass. % Sublimation-type thermal transfer medium, comprising a bispyrazolone dye in an amount of not more than 1%.   The resin contained in the dye layer contains a polyvinyl alcohol component as a main resin in a resin ratio of 5% by mass or more and 20% by mass or less, and reacts with the main resin as a secondary resin to form a polyvinyl alcohol component of the main resin. 2. The sublimation type thermal transfer medium according to claim 1, wherein a resin chemically bonded to OH groups is used.   3. The sublimation type thermal transfer medium according to claim 1, wherein the molecular weight of the acetamide derivative dye contained in the cyan dye layer in the dye layer is 500 or less.   The sublimation type thermal transfer medium according to claim 1, wherein the dye layer contains a release agent.

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