JPH1120323A - Thermal transfer sheet - Google Patents

Abstract

(57) [Problem] To provide a heat transfer sheet having excellent heat resistance and excellent heat resistance in which a heat-resistant layer and a base film are prevented from wrinkling by printing. SOLUTION: A heat-resistant layer is provided between a base film of a thermal transfer sheet and a heat-resistant lubricating layer, and the heat-resistant layer is composed of an acrylic resin and a dicarboxylic acid. Or, in a mixed state, since it has not only the carboxyl group of the acrylic resin but also the carboxyl group of the dicarboxylic acid, the base film of the thermal transfer sheet (mainly a polyester film)
, And the adhesion to the substrate film is increased. Also, by using acrylic resin,
A heat transfer sheet having heat resistance and preventing wrinkles and the like due to printing can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat transfer sheet, and more particularly, to a base film having a heat transfer color material layer formed on one surface and a heat-resistant layer and a heat-resistant lubricating layer formed on the other surface. The present invention relates to a heat transfer sheet having a heat-resistant layer in which a heat-resistant layer is formed from a specific material and wrinkles due to printing are improved.

[0002]

2. Description of the Related Art Conventionally, a plastic film such as a polyester film is used as a substrate film as a thermal transfer sheet, and a dye which is a thermal transfer color material layer comprising a sublimable dye and a binder resin is formed on one surface of the substrate film. There is a sublimation type thermal transfer sheet provided with a layer, and a heat melting type thermal transfer sheet provided with a heat melting ink layer made of a heat melting composition containing a coloring agent instead of the dye layer. These thermal transfer sheets are heated imagewise from the back side by a thermal head, and the dye layer or the heat-meltable ink layer is transferred to a material to be transferred to form an image.

[0003] Further, when printing with high density using a conventional thermal transfer sheet, a plastic film as a base film is used.
When a high temperature higher than the melting point of plastic is applied from the thermal head, the base film loses heat and wrinkles are generated on the thermal transfer sheet, resulting in an image printed
Image unevenness due to the wrinkles occurs. It has been proposed to form a layer (a heat-resistant lubricating layer) containing various heat-resistant resins on the surface of the base film opposite to the surface of the thermal transfer color material layer so that wrinkles do not occur in such a thermal transfer sheet. .
Further, heat resistance has been improved by crosslinking a heat cross-linkable polymer, a UV cross-linkable polymer, an electron beam cross-linkable polymer, or the like, which is a heat-resistant resin, in the heat-resistant lubricating layer of the thermal transfer sheet.

[0004]

However, in these methods, when the thickness of the layer is increased in order to obtain the desired performance, a large amount of energy is required to cure the heat-resistant resin. As a result, there has been a problem that thermal deformation occurs in the base film of the thermal transfer sheet. Also,
An acrylic resin has been proposed as a heat-resistant resin, but has problems such as poor adhesion to a substrate film such as a polyester film of a thermal transfer sheet, and the heat-resistant lubricating layer does not adhere to the substrate film. Therefore, in order to solve the above problems, an object of the present invention is to provide a heat transfer sheet in which a heat transfer color material layer is formed on one surface of a base film and a heat resistant slip layer is formed on the other surface. An object of the present invention is to provide a heat transfer sheet having a heat-resistant layer provided with a heat-resistant layer between a material film and a heat-resistant lubricating layer, having excellent adhesion between the heat-resistant layer and the base film and preventing wrinkles and the like during printing.

[0005]

The above object is achieved by the present invention described below. That is, the present invention relates to a heat transfer sheet in which a heat transfer color material layer is formed on one surface of a base film and a heat-resistant slip layer is formed on the other surface. A heat-resistant layer, wherein the heat-resistant layer contains an acrylic resin and a dicarboxylic acid. Further, it is preferable to copolymerize the acrylic resin with a dicarboxylic acid. Further, it is preferable to mix a dicarboxylic acid with the acrylic resin. Furthermore, it is preferable that the thermal transfer color material layer is a thermal sublimable dye layer or a thermal fusible ink layer.

[0006]

A heat-resistant layer is provided between the base film of the thermal transfer sheet and the heat-resistant lubricating layer, and the heat-resistant layer is composed of an acrylic resin and a dicarboxylic acid. In a mixed state,
Since it has not only the carboxyl group of the acrylic resin but also the carboxyl group of the dicarboxylic acid, it has good affinity with the base film (mainly polyester film) of the thermal transfer sheet, and has high adhesion to the base film. Become. Further, by using an acrylic resin, a heat transfer sheet having heat resistance and preventing wrinkles or the like due to printing can be obtained.

[0007]

Next, an embodiment of the present invention will be described. (Substrate film) As the substrate film constituting the thermal transfer sheet of the present invention, any film may be used as long as it has a conventionally known degree of heat resistance and strength.
A polyethylene terephthalate film having a thickness of about 0.5 to 50 μm, preferably about 3 to 10 μm, a 1,4-polycyclohexylene dimethylene terephthalate film,
Polyethylene naphthalate film, polyphenylene sulfide film, polystyrene film, polypropylene film, polysulfone film, aramid film, polycarbonate film, polyvinyl alcohol film, cellophane, cellulose derivatives such as cellulose acetate, polyethylene film, polyvinyl chloride film, nylon film, polyimide film In addition to resin films such as ionomer films, papers such as condenser paper and paraffin paper, and nonwoven fabrics, or composites of paper and nonwoven fabrics with resins may be used.

(Heat-Resistant Layer) In the present invention, a heat-resistant layer containing an acrylic resin and dicarboxylic acid is provided between the base film and the heat-resistant lubricating layer. That is, as the binder resin forming the heat-resistant layer, a resin obtained by copolymerizing or mixing a dicarboxylic acid with an acrylic resin is used. Acrylic resin is a resin obtained by polymerizing acrylic acid and its derivatives, acrylic acid, acrylic acid ester,
It also includes polymers such as acrylamide, acrylonitrile, methacrylic acid, and methacrylic acid esters, and copolymers with other monomers such as styrene. The dicarboxylic acid has two carboxyl groups, and examples thereof include maleic acid, fumaric acid, itaconic acid, and acid anhydrides thereof. Those obtained by copolymerizing such an acrylic resin with a dicarboxylic acid as a monomer can be preferably used in the heat-resistant layer of the present invention. In addition, a mixture of an acrylic resin and a dicarboxylic acid, and not a mixture of the acrylic resin and the dicarboxylic acid chemically reacted, but also a mixture of the acrylic resin and the dicarboxylic acid, the heat-resistant layer of the present invention. Can be used preferably.

When the acrylic resin is copolymerized with dicarboxylic acid as a monomer, the ratio of acrylic acid to dicarboxylic acid is 0.001 to 0.
4. It is preferable that the remainder is acrylic acid. If the amount of dicarboxylic acid is too small, the adhesiveness between the heat-resistant layer and the base film decreases, which is not preferable. Also, if the amount of dicarboxylic acid is large, wrinkles due to printing are likely to occur, which is not preferable.

When a dicarboxylic acid is mixed with the acrylic resin, it is preferable to mix 0.1 to 60 parts by weight of the dicarboxylic acid with respect to 100 parts by weight of the acrylic resin. When the amount of dicarboxylic acid is small, the adhesiveness between the heat-resistant layer and the base film is reduced, and the heat-resistant layer is separated from the base film, which is not preferable. Also, when there are many dicarboxylic acids,
Since the heat resistance is reduced, wrinkles due to printing are likely to occur, which is not preferable. In addition to the above-mentioned acrylic resin obtained by copolymerizing or mixing a dicarboxylic acid, the resin is not particularly limited as long as it has heat resistance, and a thermoplastic resin or a thermosetting resin alone or a mixture may be added. In order to further improve the heat resistance, a reaction product with various isocyanate curing agents or a monomer or oligomer having an unsaturated bond may be used, and the curing method is not particularly limited, such as heating and irradiation with ionizing radiation. Various modified resins obtained by modifying a binder resin with silicone or long-chain alkyl can also be used.

Examples of binder resins that can be used in addition to those obtained by copolymerizing or mixing dicarboxylic acids with acrylic resins include polyester resins, polyvinyl acetate resins, polyurethane resins, norbornene resins, polyolefin resins, and polystyrene resins. Thermoplastic resins such as resins, polyvinyl chloride resins, polyether resins, polyamide resins, polycarbonate resins, polyethylene resins, polypropylene resins, polyvinyl chloride resins, polyvinyl butyral resins, and polyvinyl acetal resins such as polyvinyl acetoacetal resins. No. Examples of the modified resin include various types of commercially available modified silicone resins and resins obtained by reacting a resin having a hydroxyl group, which is obtained by modifying a monovalent higher alcohol with an isocyanate, such as an acetal resin.

An inorganic or organic filler can be added to the heat-resistant layer for the purpose of processing suitability of the thermal transfer sheet, stabilization of printing running property, and imparting cleaning property of the thermal head. As a method of forming the heat-resistant layer, the above materials are dissolved in a solvent such as acetone, methyl ethyl ketone, toluene, xylene or water selected to suit the coating suitability,
Alternatively, there is a method in which a coating liquid is prepared by dispersing, and the coating liquid is applied, dried, and solidified by a conventional coating means such as a gravure coater, a roll coater, and a wire bar to form a film. The coating amount, that is, the thickness of the heat-resistant layer is preferably 5.0 g / m ² or less based on the solid content, and is preferably 0.1 to 2.0 g / m ^2.
A heat-resistant layer having sufficient performance can be formed with a thickness of g / m ² .

(Heat-resistant lubricating layer) The heat-resistant lubricating layer formed on the heat-resistant layer provided on one side of the substrate film can be any conventionally known one, and is not limited. The heat-resistant lubricating layer can add a thermal release agent and a filler to the binder resin as needed, and can impart a sliding property with the thermal head and a thermal release property. Examples of the binder resin forming the heat-resistant lubricating layer include a thermoplastic resin and a thermosetting resin or a crosslinked body thereof.

As the preferable thermoplastic resin, known resins can be used. For example, polyester resins, polyacrylate resins, polyvinyl acetate resins, polyurethane resins, styrene acrylate resins, polyacrylate resins, polyacrylate resins, and the like can be used. Acrylamide resins, polyamide resins, polyether resins, polystyrene resins, polyethylene resins, polypropylene resins, polyolefin resins, vinyl resins such as polyvinyl chloride resins and polyvinyl alcohol resins, cellulose resins and hydroxyethyl cellulose resins, Cellulose resins such as cellulose acetate resin, polyvinyl acetal resins such as polyvinyl acetoacetal resin and polyvinyl butyral resin,
Examples of the resin include a silicone-modified resin and a long-chain alkyl-modified resin. Particularly preferred in the present invention are polyvinyl acetal resins such as polyvinyl acetoacetal resin and polyvinyl butyral resin.

In order to improve the heat resistance of the heat-resistant lubricating layer, the strength of the coating film, and the adhesion to the substrate, a cured product of a thermoplastic resin having a reactive group in the resin and a polyisocyanate or an unsaturated resin is used. It is desirable to use a reaction product of a monomer and an oligomer having a bond, and the curing method may be heating,
Means such as irradiation with ionizing radiation are not particularly limited. Conventionally, various isocyanate curing agents are known. Among them, it is preferable to use an adduct of an aromatic isocyanate, and Takenate (manufactured by Takeda Pharmaceutical Co., Ltd.) and Burnock (Dai Nippon Ink Chemicals) Industrial Co., Ltd.), Coronate (Nippon Polyurethane Industry Co., Ltd.), Duranate (Asahi Kasei Kogyo Co., Ltd.), Dismodur (Bayer Co., Ltd.), etc.
It can be used in the present invention. The amount of the polyisocyanate to be added is such that the amount of the binder resin constituting the heat-resistant lubricating layer is 10%.
The range of 5 to 200 parts by weight relative to 0 parts by weight is appropriate. The ratio of -NCO / -OH is preferably in the range of 0.6 to 2.0. If the amount of the polyisocyanate is small, the crosslink density becomes low, and the heat resistance becomes insufficient. On the other hand, if the amount of the polyisocyanate added is large, the shrinkage of the formed coating film cannot be controlled, the curing time is prolonged, and unreacted -NCO groups remain in the heat-resistant lubricating layer and react with moisture in the atmosphere. In some cases, malfunctions may occur.

In place of or in combination with the above polyisocyanate, a monomer or oligomer having an unsaturated bond is used in combination with the heat-resistant lubricating layer for the purpose of imparting heat resistance, coating properties and adhesion to a substrate. be able to. When a monomer or oligomer having an unsaturated bond is used as a cross-linking agent, the curing method may be either electron beam curing or UV irradiation curing. However, when a large amount of filler is added, curing by electron beam irradiation is preferable. As the monomer or oligomer having an unsaturated bond, tetraethylene glycol di (meth) acrylate and ｛(meth) acrylate mean both acrylate and methacrylate. same as below. ２, bifunctional monomers such as divinylbenzene, diallyl phthalate, etc .; trifunctional monomers such as triallyl isocyanurate, trimethylolpropane tri (meth) acrylate; tetramethylolmethane tetra (meth)
Acrylate, trimethoxyethoxyvinylsilane or 5
Examples include monomers having functionalities or higher, and oligomers and macromers composed of these monomers.

Thermal release agents include phosphate ester surfactants, dimethylpolysiloxane, methylphenylpolysiloxane, polyethylene wax, montan wax, fatty acid amide, fatty acid ester, long chain aliphatic compound, low molecular weight polypropylene, ethylene oxide Block copolymers with propylene oxide, higher fatty acid metal salts, condensates with polyether compounds, perfluoroalkylethylene oxide adducts, long-chain alkylsulfonic acid metal salts, sorbitanate esters, higher alcohols and / or higher amines One or more of the nonionic surfactants such as a reaction product of a compound with an isocyanate are used. The amount of the heat release agent is based on 100 parts by weight of the binder resin.
It is 1 to 100 parts by weight, preferably 2 to 50 parts by weight.

If the amount of the thermal release agent is small, sufficient thermal release properties with respect to the thermal head cannot be obtained, which may cause wrinkles of prints, head debris, and sticking. When saving by winding
Sufficient heat releasability is obtained because the dye of the corresponding heat transferable color material layer migrates to the heat-resistant lubricating layer, and conversely, the heat release agent of the heat-resistant lubricating layer migrates to the heat transferable colorant layer. However, wrinkles and head scum may occur, or the color reproducibility of the print may be affected. When a phosphate ester surfactant is used as the heat releasing agent, an inorganic neutralizer such as magnesium hydroxide or magnesium oxide or an organic neutralizer such as triethanolamine is used for those having acidity. It is desirable to use them together.

The filler (inorganic / organic filler) has excellent lubricity and releasability, good thermal head running properties,
It is desirable that the thermal head does not cause sticking, wrinkles, or breakage, and that the thermal head has a small amount of wear and is sufficient and sufficient to provide a good heat-resistant lubricating layer. Therefore, it is necessary to select a filler having an appropriate hardness. For example, examples of the inorganic filler include talc, kaolin, clay, magnesium hydroxide, calcium carbonate, magnesium carbonate, precipitated barium sulfate, hydrotalcite, and the like. Preferably, talc, kaolin, clay, and the like are used. It is preferable that the material has an appropriate hardness. Examples of the organic filler include an acrylic resin filler, a silicone resin filler, and a fluorine-based filler. Further, inorganic / inorganic, inorganic / organic, and organic / organic composite fine particles may be used. The average particle size of these fillers is 0.01 to
10 μm, preferably about 0.1 to 5 μm, the surface of the coating film is roughened by containing the above filler, and the coefficient of friction is reduced by reducing the number of contact points with the thermal head to provide lubricity. can do. Furthermore, workability such as reduction of wrinkles during winding can be improved by roughening the surface of the coating film.

The heat-resistant lubricating layer is formed by dissolving or dispersing the above-mentioned material in a solvent such as acetone, methyl ethyl ketone, toluene, xylene or the like selected so as to be suitable for coating, or by dissolving or dispersing in water. A method of forming a film by coating, drying, and solidifying the coating liquid with a conventional coating means such as a gravure coater, a roll coater, and a wire bar is used. The coating amount, that is, the thickness of the heat-resistant lubricating layer is preferably not more than 3.0 g / m ^{2, and} more preferably not more than 0.3 g / m ² on a solid content basis.
A heat-resistant lubricating layer having sufficient performance can be formed at a thickness of 1 to 1.0 g / m ² .

(Thermal Transfer Coloring Material Layer) As the thermal transfer coloring material layer formed on the other surface of the base film, in the case of a sublimation type thermal transfer sheet, a dye layer containing a heat sublimable dye is formed;
On the other hand, in the case of the heat transfer type thermal transfer sheet, a heat fusible ink layer colored with a pigment or the like is formed. Hereinafter, the case of a sublimation type thermal transfer sheet will be described as a representative example, but the present invention is not limited to only a sublimation type thermal transfer sheet. As the dye used in the sublimation type dye layer, any dye conventionally used in a known thermal transfer sheet can be used in the present invention and is not particularly limited. For example, some preferred dyes include MS Red as a red dye.
G, Macro Red Violet®, Ceres
Red 7B, Samaron Red HBSL,
ResolinRed F3BS and the like, and as a yellow dye, Holon Brilliant Yellow 6G
L, PTY-52, Macrolex Yellow 6G, etc., and as a blue dye, Kayaset Blue 71
4, Waxolin Blue AP-FW, Holon Brilliant Blue SR, MS Blue 100 and the like.

Preferred examples of the binder resin for supporting the dye as described above include cellulose resins such as ethyl cellulose, hydroxyethyl cellulose, ethyl hydroxy cellulose, hydroxypropyl cellulose, methyl cellulose, cellulose acetate, and cellulose acetate butyrate, and polyvinyl resins. Vinyl resins such as alcohol, polyvinyl acetate, polyvinyl butyral, polyvinyl acetoacetal, and polyvinylpyrrolidone; acrylic resins such as poly (meth) acrylate and poly (meth) acrylamide; polyurethane resins; polyamide resins; and polyester resins. Among them, cellulose-based, vinyl-based, acrylic-based, polyurethane-based and polyester-based resins are preferred from the viewpoints of heat resistance, dye migration, and the like. There.

The dye layer is obtained by adding an additive such as a releasing agent or organic or inorganic fine particles to one surface of the above-described base film, if necessary, to the above-mentioned dye and binder resin. , Toluene, methyl ethyl ketone, ethanol, isopropyl alcohol, cyclohexanone,
Dissolved in a suitable organic solvent such as DMF, or dispersed in an organic solvent or water, for example, gravure printing,
It can be formed by coating and drying by means such as a screen printing method and a reverse roll coating printing method using a gravure plate.

The dye layer thus formed has a solid content of 0.2 to 5.0 μm, preferably 0.4 to 2.0 μm.
μm, and the sublimable dye in the dye layer is
5 to 90% by weight of the weight of the dye layer, preferably 10 to 70%
It is preferably present in an amount of weight percent. When the desired image is a monocolor, the dye layer to be formed selects at least one of the dyes to form one type of dye layer, and when the desired image is a full-color image, Is
For example, appropriate cyan, magenta, and yellow (and, if necessary, black) are selected to form cyan, magenta, and yellow (and, optionally, black) dye layers.

The image-receiving sheet used for forming an image using the above-described thermal transfer sheet may be any image-receiving sheet as long as its recording surface has a dye-accepting property for the above-mentioned dye. In the case of paper, metal, glass, synthetic resin, or the like having no dye receptivity, a dye receiving layer may be formed on at least one surface thereof. In the case of a heat transfer type thermal transfer sheet, the image receiving sheet is not particularly limited, and may be ordinary paper or a plastic film. As a printer used when performing thermal transfer using the above-described thermal transfer sheet and the above-described image receiving sheet, a known thermal transfer printer can be used as it is, and is not particularly limited.

[0026]

Next, the present invention will be described more specifically with reference to examples and comparative examples. In the following description, parts and% are based on weight unless otherwise specified. (Example 1) The following heat-resistant layer coating liquid A was dried on a 4.5 μm-thick polyester film as a base film by drying to about 0.
The coating was dried at 5 g / m ² and dried to form a heat-resistant layer. On the heat-resistant layer, a coating liquid A for a heat-resistant lubricating layer was applied so as to be about 1.0 g / m ² when dried, and dried to form a heat-resistant lubricating layer.

Composition of coating solution A for heat-resistant layer Compound A below 5.0 parts Ethyl acetate 9.5 parts

[0028]

Embedded image A and b in the above formula represent integers, and in each molar fraction of the acrylic acid monomer of a and the fumaric acid monomer of b, a is 0.6 to 0.999, and b is 0.001 to 0.001. 0.4
It is.

Coating liquid A composition for heat-resistant lubricating layer 1.60 parts of polyvinyl butyral resin (manufactured by Sekisui Chemical Co., Ltd., Eslex BX-11) 4.23 parts of polyisocyanate (manufactured by Dainippon Ink and Chemicals, Inc.) Burnock D750-45) Phosphate ester surfactant 0.68 parts (Daiichi Kogyo Seiyaku Co., Ltd., Plysurf A208S) Talc (Nippon Talc, Microace L-1) 0.32 parts Methyl ethyl ketone 38.43 parts 38.43 parts of toluene

On a substrate film surface opposite to the heat-resistant lubricating layer, a dye layer-forming ink having the following composition was dried at a thickness of 1.0 g /
m ² was applied by a gravure coater and dried to form a dye layer to obtain a thermal transfer sheet of Example 1 of the present invention. Dye layer forming ink composition I. Solvent Blue 22 5.5 parts Polyvinyl acetoacetal resin 3.0 parts (KS-5, manufactured by Sekisui Chemical Co., Ltd.) Methyl ethyl ketone 22.0 parts Toluene 68.0 parts

(Example 2) The thermal transfer sheet of Example 2 of the present invention was prepared in the same manner as in Example 1 except that the following coating liquid B was used in place of the coating liquid for a heat-resistant layer of Example 1. Obtained. Heat-resistant layer coating liquid B composition Compound B below 5.0 parts Ethyl acetate 9.5 parts

[0032]

Embedded image A and b in the above formula represent integers, and in each molar fraction of the methacrylic acid monomer of a and the itaconic acid monomer of b, a is 0.6 to 0.999, and b is 0.001 to 0.001.
0.4.

Example 3 The thermal transfer sheet of Example 2 of the present invention was prepared in the same manner as in Example 1 except that the following coating solution C was used in place of the coating solution for the heat-resistant layer of Example 1. Obtained. Heat-Resistant Layer Coating Composition C Polyacrylic acid 4.5 parts Maleic anhydride 0.5 parts Ethyl acetate 9.5 parts

(Comparative Example 1) 4.5 μm as a base film
The coating liquid A for a heat-resistant lubricating layer was applied to a m-thick polyester film so as to have a dry weight of about 1.0 g / m ² and dried to form a heat-resistant lubricating layer. The dye layer forming ink used in Example 1 was applied to the substrate film surface on the side opposite to the heat-resistant lubricating layer by a gravure coater so as to have a dry thickness of 1.0 g / m ² , dried, and dried. A layer was formed to obtain a thermal transfer sheet of Comparative Example 1.

Comparative Example 2 A thermal transfer sheet of Comparative Example 2 was obtained in the same manner as in Example 1, except that the following coating liquid D was used in place of the coating liquid for a heat-resistant layer of Example 1. Heat-resistant layer coating liquid D composition acrylic resin 10 parts (Mitsui Toatsu Chemicals Co., Ltd., Almatex L2100) Ethyl acetate 90 parts

The thermal transfer sheets of each of the above Examples and Comparative Examples were evaluated for the adhesion between the base film and the heat-resistant layer or the heat-resistant lubricating layer, and the heat-sealing property of the thermal transfer film with the thermal head. The evaluation method will be described below. Evaluation method 1. Adhesiveness Mending tape (Nichiban Nystack 12mm
5 cm), and 3 cm of the 5 cm is pasted on the heat-resistant lubricating layer of each thermal transfer sheet. Thereafter, the tape was peeled off at a stretch by 90 °, and it was confirmed whether the base film and the heat-resistant layer or the heat-resistant lubricating layer were in close contact with each other.

The evaluation criteria are as follows. ○: The base film and the heat-resistant layer or the heat-resistant lubricating layer adhere to each other,
Nothing remains on the peeled tape. ×: The base film and the heat-resistant layer or the heat-resistant lubricating layer are not in close contact with each other, and the peeled tape shows peeling of the layer.

2. Print wrinkles Using a thermal transfer printer that makes it easier to generate print wrinkles by adjusting the pressing pressure of the thermal head to be biased, use a pattern generator (manufactured by KENWOOD, CG-93).
In 1), a dark solid was printed in an environment of 30 ° C. and 80% RH, and evaluated with the naked eye. The evaluation criteria are as follows. ：: No print wrinkles. Δ: Fine print wrinkles are present at the end.

(Evaluation Results) The evaluation results are shown in Table 1.

[Table 1]

[0040]

As described above, according to the present invention, in a heat transfer sheet having a heat transfer color material layer formed on one surface of a base film and a heat-resistant lubricating layer formed on the other surface, A heat-resistant layer is provided between the heat-resistant lubricating layer and the heat-resistant layer. The heat-resistant layer contains an acrylic resin and a dicarboxylic acid, so that the adhesiveness between the heat-resistant layer and the base film is excellent, and that wrinkles due to printing are prevented. A heat transfer sheet having improved heat resistance is obtained.

Claims (4)

[Claims] 1. A heat transfer sheet having a heat transfer color material layer formed on one surface of a base film and a heat resistant slip layer formed on the other surface, wherein a heat transfer color material layer is formed between the base film and the heat resistant slip layer. A heat transfer sheet provided with a heat-resistant layer, wherein the heat-resistant layer contains an acrylic resin and dicarboxylic acid. 2. The thermal transfer sheet according to claim 1, wherein a dicarboxylic acid is copolymerized with the acrylic resin. 3. The thermal transfer sheet according to claim 1, wherein a dicarboxylic acid is mixed with the acrylic resin. 4. The method according to claim 1, wherein the heat transfer color material layer is a heat sublimable dye layer,
The thermal transfer sheet according to claim 1, wherein the thermal transfer sheet is a heat-meltable ink layer.