JPH08300842A - Thermal transfer sheet - Google Patents

Abstract

PURPOSE: To provide a thermal transfer sheet having antistatic effect, good in the adhesiveness of a base material film and a heat-resistance lubricating layer and running properites and not generating the trouble by static electricity at a time of printing. CONSTITUTION: In a thermal transfer sheet wherein a thermal transfer colorant layer 2 is provided on one surface of a base material film 1 and a heat resistant lubricating layer 3 is formed on the other surface thereof, at least one antistatic layer 2 consisting of water-soluble polyester and a quaternary ammonium salt type acrylic resin is provided between the base material film 1 and the heat- resistant lubricating layer 3 or the thermal transfer colorant layer 2.

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, more specifically, a water-soluble polyester and a quaternary ammonium salt type acrylic resin system between a base film and a heat resistant slipping layer or a heat transfer coloring material layer. The thermal transfer sheet is provided with an antistatic effect by providing a layer consisting of.

[0002]

2. Description of the Related Art A conventional thermal transfer sheet uses a plastic film such as a polyester film as a base film and has a sublimable dye layer composed of a sublimable dye and a binder resin on one surface of the base film. There are a heat sublimation type (heat diffusion type) transfer sheet provided and a heat melting type transfer sheet having a heat fusible ink layer containing a colorant and a heat fusible composition instead of the dye layer. These thermal transfer sheets are heated from the heat resistant slipping layer side by a thermal head according to image information to transfer the color material layer to the transfer material to form an image. However, there are few conventional thermal transfer sheets that have been subjected to antistatic treatment.Therefore, the thermal transfer sheet may be wound around the drum due to static electricity generated during printing and may cause defective running, or may be stuck on the image receiving paper. There have been problems such as paper or paper discharge failure, and discharge breakdown in the heating element portion of the thermal head. In order to solve such a problem, it has been proposed to provide an antistatic layer between the base film and the heat resistant slipping layer.

[0003]

When a conductive polymer is used as the antistatic layer, the antistatic layer gives an antistatic effect, but on the other hand, it sometimes deteriorates the adhesion to the base film or the heat resistant slipping layer. . Although studies have been conducted to improve such adhesion deterioration, the antistatic effect is lost by improving the adhesion, or an adhesive layer is provided between the antistatic layer and the base film or the heat resistant slipping layer. In addition, there are inconveniences such as a multilayer structure. Further, an antistatic agent has been added to the resin as a heat resistant slipping layer, but slipperiness and heat resistance are reduced, stains are caused by a dye, and a base film and a heat resistant slipping layer Problems such as poor adhesion occurred.

[0004]

In order to solve these problems, a heat transfer coloring material layer is provided on one surface of a base film,
The heat transfer sheet of the present invention in which a heat resistant slipping layer is formed on the other surface is a water-soluble polyester and a quaternary ammonium salt type between the base film and the heat resistant slipping layer or the heat transfer coloring material layer. At least one antistatic layer made of acrylic resin
One is provided. Further, the resin system of the antistatic layer is such that the water-soluble polyester is 10 to 10% of solid content of the antistatic layer.
70% by weight and 30 to 90% by weight of the quaternary ammonium salt type acrylic resin. The thermal transfer color material layer is a thermal transfer sheet composed of a sublimable dye layer or a hot-melt ink layer.

[0005]

By providing a layer composed of a water-soluble polyester and a quaternary ammonium salt type acrylic resin system between the base material film and the heat resistant slipping layer or the heat transfer coloring material layer, an antistatic effect can be obtained and the base material Adhesion between the film and the heat resistant slipping layer or the heat transfer coloring material layer was not deteriorated.

The preferred embodiments of the present invention will be described in more detail. The substrate film constituting the thermal transfer sheet of the present invention can be used as long as it has conventionally known heat resistance and strength, and is not particularly limited. For example, 0.5 to 50 μm, preferably 3 to 10
Paper with thickness of about μm and various processed papers, polyethylene terephthalate, polybutylene terephthalate, 1,4
-Polycyclohexylene dimethylene terephthalate, polyethylene naphthalate, polyphenylene sulfide, polyethylene, polypropylene, polysulfone, aramid, polycarbonate, cellophane, polyvinyl alcohol, saponified ethylene / vinyl acetate copolymer A stretched or unstretched film produced from cellulose derivative such as cellulose acetate, polystyrene, polyvinyl chloride, 6-nylon, 6,6 nylon, polyimide, ionomer and the like is used. Among them, particularly preferred are biaxially stretched polyethylene terephthalate film (hereinafter, simply referred to as polyester film), and these resins and capacitors-paper, paper such as paraffin paper, It may be a composite with a non-woven fabric or the like. These substrate films may be a single-wafer type or a continuous sheet supplied by winding, and the material and form can be selected according to the application.

The binder resin forming the heat resistant slipping layer is
It is a thermoplastic resin and a thermosetting resin or a cross-linked product thereof. As a preferable thermoplastic resin, a known resin can be used,
For example, polyester resin, polyacrylic acid ester resin, polyvinyl acetate resin, polyurethane resin, styrene acrylate resin, polyacrylamide resin, polyamide resin, polyether resin, polystyrene resin, polyethylene Resins, polypropylene resins, vinyl resins such as polyvinyl chloride resins and polyvinyl alcohol resins, cellulose resins, hydroxyethyl cellulose resins, cellulose resins such as acetate cellulose resins, polyvinylacetate Acetal and polyvinyl butyral
Examples thereof include polyvinyl acetal-based resins such as polyvinyl alcohol, silicone-modified resins, long-chain alkyl-modified resins, and the like. Particularly preferred resins in the present invention include polyvinyl acetals such as polyvinyl acetoacetal and polyvinyl butyral. -A varnish made of a resin based on a resin.

Further, in order to improve the heat resistance of the heat resistant slipping layer, the coating film strength and the adhesion to the base film, a reaction cured product of a thermoplastic resin having a reactive group in the resin and polyisocyanate, Monomers and oligomers having unsaturated bonds
It is desirable to use the reaction product of The curing method is not particularly limited in terms of heating or irradiation with ionizing radiation. Various types of isocyanate-based curing agents have been conventionally known. Among them, it is preferable to use an aromatic isocyanate adduct. Specifically, Takenet (Takeda Pharmaceutical Co., Ltd.)
Manufactured by Dai Nippon Ink Chemical Co., Ltd.,
It can be used in the present invention by obtaining it under the trade names of Coronet (manufactured by Nippon Polyurethane Industry Co., Ltd.), Duranet (manufactured by Asahi Kasei Co., Ltd.), Dismodule (manufactured by Bayer). The amount of polyisocyanate added is 100 parts by weight of the binder resin constituting the heat resistant slipping layer.
A range of 5 to 200 parts by weight is suitable. And-NC
The O / -OH ratio is preferably in the range of 0.6 to 2.0. If the amount of polyisocyanate added is small, the crosslink density will be low and the heat resistance will be insufficient. On the other hand, if the addition amount of polyisocyanate is large, the shrinkage of the coating film formed cannot be controlled, the curing time is prolonged, and unreacted NCO groups remain in the heat resistant slipping layer and react with moisture in the atmosphere. It may cause troubles such as doing.

Further, instead of or in combination with the above polyisocyanate, a monomer or oligomer having an unsaturated bond is used for the purpose of imparting heat resistance, coating property and adhesiveness to the base film to the heat resistant slipping layer. can do.
When a monomer or oligomer having an unsaturated bond is used as a crosslinking agent, the curing method may be electron beam or ultraviolet irradiation curing, but when the amount of filler added is large, curing by electron beam irradiation is preferable. Tetraethylene glycol di (meth) acrylate as a monomer or oligomer having an unsaturated bond {in this specification, (meth) acrylate means both acrylate and methacrylate. same as below. }, Divinylbenzene, diallyl phthalate and other bifunctional monomers, triallyl isocyanurate, trimethylolpropane tri (meth) acrylate and other trifunctional monomers, tetramethylolmethane tetra (meth) acrylate, trimethoxyethoxyvinylsilane, Examples thereof include pentafunctional or higher functional monomers and oligomers and macromers composed of these monomers.

The thermal release agent used in the present invention is a phosphoric acid ester type surfactant, dimethyl polysiloxane, methylphenyl polysiloxane, polyethylene wax, montan wax, fatty acid amide, fatty acid ester, long chain aliphatic compound, low Molecular weight polypropylene, block copolymers of ethylene oxide and propylene oxide, condensates of fatty acid salts and polyether compounds, perfluoroalkylethylene oxide adducts, long-chain alkylsulfonic acid sodium salts, sorbitan acid ester-based, higher alcohols as well as/
Alternatively, one or more nonionic surfactants such as a reaction product of a higher amine and an isocyanate are used. The thermal release agent is added in an amount of 1 to 100 parts by weight, preferably 2 to 50 parts by weight, based on 100 parts by weight of the binder resin.
Parts by weight.

When the amount of the thermal release agent added is small, the thermal release property to the thermal head becomes insufficient, which causes printing wrinkles, head scum, and sticking. On the other hand, when the added amount is large, the thermal transfer seal is produced. When the tape is stored by winding, the dye of the corresponding thermal transfer coloring material layer migrates to the heat resistant slipping layer,
On the contrary, since the thermal release agent of the heat resistant slipping layer is transferred to the thermal transfer color material layer, sufficient thermal release property cannot be obtained, and print wrinkles, head scum, etc. may occur, and color reproducibility of the printed matter may be deteriorated. It even affects. When a phosphate ester type surfactant is used as the thermal release agent, an inorganic type neutralizing agent such as magnesium hydroxide or magnesium oxide or an organic type neutralizing agent such as triethanolamine is used especially for those exhibiting acidity. It is desirable to use them together.

The filler (inorganic filler and / or organic filler) used in the present invention has excellent lubricity and releasability,
It is necessary to select a filler having an appropriate hardness in order to provide a good heat resistant slipping layer which has good thermal head running property, does not cause sticking, wrinkles and breakage and has little wear of the thermal head. Examples of the inorganic filler include talc, kaolin, clay, magnesium hydroxide, calcium carbonate, magnesium carbonate, precipitated barium sulfate, hydrotalcite, and mica.
Preferably, talc, kaolin, clay, or the like having a breaking property and an appropriate hardness is preferable. As the organic filler, an acrylic resin filler, a silicone resin filler,
Examples include Teflon filler. Also, inorganic / inorganic,
Inorganic / organic, organic / organic composite fine particles may be used. In addition,
The average particle size of these fillers is 0.01 to 10 μm,
The thickness is preferably about 0.1 to 5 μm, and the surface of the coating film is roughened by containing the above filler, and the friction coefficient is reduced and the lubricity is imparted by reducing the contact points with the thermal head. be able to. Further, by roughening the surface of the coating film, it is possible to improve processing suitability such as reducing wrinkles during winding.

The resin forming the antistatic layer is a quaternary ammonium salt type acrylic resin and water-soluble polyester. Quaternary ammonium salt type acrylic resin is PS-8
14, PS-818 (Nippon Kakoh Co., Ltd.), BON
Trade names such as DEIP (manufactured by Konishi Co., Ltd.) and water-soluble polyesters are W-005, WR-961, WR-950,
A product having a trade name such as WR-930 (manufactured by Nippon Synthetic Chemical Industry Co., Ltd.) can be obtained and used in the present invention. Adhesiveness to the base film, heat resistant slipping layer or thermal transfer coloring material layer is good, and in order to have an antistatic effect, a quaternary ammonium salt type acrylic resin contains 30 to 90% by weight of the antistatic layer. Is good, and more preferably 40 to 80% by weight. When the amount of the quaternary ammonium salt type acrylic resin in the antistatic layer is 30% by weight or less, the antistatic effect is lost, and when it is 90% by weight or more, the adhesion between the base film and the heat resistant slipping layer or the heat transfer color material layer is achieved. Defects occur. Further, various additives can be added to the antistatic layer as needed, and examples of the additives include inorganic and organic conductive fillers and inorganic ion exchangers.

As a method for forming the antistatic layer, the above-mentioned materials are dissolved or dispersed in a solvent such as acetone, methyl ethyl ketone, ethyl acetate, methanol, water or alkaline water selected to suit the coating suitability, and the coating is performed. Make a liquid. Then, apply this coating solution to a gravure coat and a roll coat.
It is formed by coating, drying and solidifying by a conventional coating means such as coating, wire bar coating and air knife coating. The coating amount, that is, the thickness of the antistatic layer is preferably ² g / m ² or less based on the solid content, and preferably 0.1 to 1
A sufficient antistatic effect can be obtained with a thickness of 1.0 g / m ² . When used with polyisocyanate, a heat-resistant slipping layer is applied and dried, and then unreacted residual isocyanate is used.
It is preferable to perform heating and aging treatment in order to complete the reaction of the group. The antistatic layer may be provided between the base film and the heat resistant slipping layer, or between the base film and the thermal transfer color material layer, or both.

On the other hand, when the heat transfer color material layer formed on the other surface of the substrate film is a heat sublimation type heat transfer sheet, a layer containing a sublimable dye is formed, and a heat melting type heat transfer layer is formed. When it is a sheet, it is formed of a layer made of a heat-meltable ink colored with a pigment or the like. Hereinafter, a thermal sublimation type thermal transfer sheet will be described in detail as a representative example, but the present invention is not limited to the thermal sublimation type thermal transfer sheet. As the dye used in the heat transfer sublimation type heat transfer color material layer, any dye conventionally used in known heat transfer sheets can be used in the invention and is not particularly limited. Examples of these dyes are diarylmethane-based, triarylmethane-based, thiazole-based, methine-based such as merocyanine, indoaniline-based, acetophenone azomethine, pyrazoloazomethine, imidazoleazomethine, pyridone-azomethine-based azomethine-based, xanthene-based. , Oxazine-based, dicyanostyrene, cyanomethylene-based typified by tricyanostyrene, thiazine-based, azine-based, acridine-based, benzeneazo-based, and pyridoneazo, thiophenazo, isothiazo-azo, pyrazolazo, pyrazolazo, imidazole Luazo, thiadiazoluazo, triazoluazo,
Examples thereof include azo dyes such as disazo, spiropyran dyes, indolinospiropyran dyes, fluorane dyes, rhodamine lactam dyes, naphthoquinone dyes, anthraquinone dyes, and quinophthalone dyes. Specifically, the following dyes are used. CI (Color Index) Dispa-Suielo-51,3,5
4,79,60,23,7,141 C.I. Disperse Bull-24,56,14,301,334,165,
19,72,87,287,154,26,354 C. I. Disperse Thread 135,146,59,1,73,60,16
7 CI Disperse Orange 149 CI Disperse Violet 4,13,26,36,56,3
1 CI Solvent Yellow-56,14,16,29 CI Solvent Bull-70,35,63,36,50,49,111,1
05,97,11 CI Solvent Red 135,81,18,25,19,23,24,1
43,146,182 C.I. Solvent Violet 13 C.I. Solvent Black 3 C.I. Solvent Green 3 , Macrolex Yellow-6G (manufactured by Bayer: Dispa-Suielo-201), and as magenta dyes, MS-RED-G (manufactured by Mitsui Toatsu Chemicals, Inc .: Disperse Thread 60), Macrolex Red Violet R ( Bayer: Disperse Violet 26
), As a cyan dye, Kayaset Bull-714
(Nippon Kayaku Co., Ltd .: Solvent Bull-63), Foron Brilliant Bull-SR (Sand: Disperse Bull-354), Waxo Limbre-AR-FW (I
CI company: Solvent Bull-36) and the like.

Next, as the binder resin for supporting the above dye, methyl cellulose and ethyl cellulose are used.
Cellulose resins such as cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, acetate cellulose, acetic acid / butyric acid cellulose, polyvinyl acetate, polyvinyl alcohol, polyvinyl butyral, polyvinyl acetol Examples include vinyl resins such as CETAR and polyvinylpyrrolidone, acrylic resins such as poly (meth) acrylate and poly (meth) acrylamide, polyurethane resins, polyamide resins, polyester resins, and the like. Among them, cellulose-based, polyurethane-based, vinyl-based, acrylic-based and polyester-based resins are preferably used from the viewpoint of heat resistance, dye transferability and the like.

The sublimable dye layer is prepared by adding these dyes and binder resin, and if necessary, additives (eg, a release agent) and fillers to one surface of the substrate film, and then adding toluene. An ink is prepared by dissolving it in a suitable organic solvent such as methyl ethyl ketone, ethanol, isopropyl alcohol, cyclohexanone or DMF, or dispersing it in an organic solvent or water. And, for example,
A coating film can be formed by coating and drying by means of a gravure printing method, a screen printing method, a reverse roll coat method, or the like. The thickness of the sublimable dye layer thus formed is 0.2 to 5.0 μm, preferably 0.4 to 2.0.
μm, and the sublimable dye in the dye layer is 5
˜90 wt%, preferably 10-70 wt%. If the desired thermal transfer color material layer image is mono-color,
One of the above dyes is selected to form a full color
If it is an image, appropriate yellow, magenta, and cyan (black is also added if necessary) are selected and formed.

The material to be transferred used for forming an image using the above-mentioned heat transfer sheet is a heat-melting type heat transfer sheet.
In the case of G, the material to be transferred is not particularly limited and may be plain paper or a plastic film. Thermal sublimation type thermal transfer sheet
In the case of paper, the recording surface may be any as long as it has a dye receptivity for the above dye, and at least when it is paper, metal, glass or synthetic resin having no dye receptivity. A dye receiving layer may be formed on one surface thereof.

A known thermal transfer printer can be used as it is as a printer to be used when performing thermal transfer using the thermal transfer sheet and the receiving sheet (transferred material). Not limited.

[0020]

EXAMPLES The present invention will be described more specifically with reference to Examples and Comparative Examples. In addition, the parts or% described in the text are based on weight unless otherwise specified. (Example 1) The following [Antistatic layer / primer layer composition liquid A] was coated on one surface of a 6.0 μm thick polyester film as the base film 1 to a thickness of 0.3 μm. The composition is dried and dried to form the antistatic layer 4, and the [heat-resistant slipping layer composition liquid A] is applied to the upper layer thereof so as to have a thickness of 1.0 μm when dried, and further cured by heating and aging. A heat resistant slipping layer 3 was formed by treatment. The following [Thermal transfer color material layer ink A] is applied to the back surface so as to have a thickness of 1.0 μm when dried, and dried to form a heat transfer color material layer. To obtain a thermal transfer sheet. [Composition liquid A for antistatic layer / primer layer] -Quaternary ammonium salt type acrylic resin PS-814 1.95 parts (manufactured by Nippon Kakoh Kogyo KK) -Water-soluble polyester WR-961 0.75 parts ( Nippon Synthetic Chemical Industry Co., Ltd.-Solvent Methanol 3.05 parts Alkaline water 1.75 parts Methyl ethyl ketone 6.50 parts [Heat resistant slip layer composition liquid A] -Polyvinyl butyral S-lex BX-1 1. 60 parts (manufactured by Sekisui Chemical Co., Ltd.)-Polyisocyanate barnock D750-45 8.46 parts (manufactured by Dainippon Ink and Chemicals, Inc.)-Phosphate ester surfactant Priserf A208S 1. 36 parts (manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd.)-Talc Microace L-1 0.32 part (manufactured by Nippon Talc Industry Co., Ltd.-Solvent Methyl ethyl ketone 38.43 parts Toluene 38.43 parts [Ink A for thermal transfer colorant layer] MS-RED-G Disperse Thread 60 2.00 parts (manufactured by Mitsui Toatsu Chemicals, Inc.) Macrolex Red Violet R Disperse Violet 26 1. 50 parts (manufactured by Bayer) ・ Polyvinyl acetoacetal KS-5 3.50 parts (manufactured by Sekisui Chemical Co., Ltd.) ・ Solvent Methyl ethyl ketone 46.5 parts Toluene 46.5 parts

(Example 2) As a base film 1, a polyester film having a thickness of 6.0 μm was coated with 0.3% of the following composition [composition liquid B for antistatic layer / primer layer] having the following composition.
The antistatic layer 4 is provided by coating and drying so as to have a thickness of μm, and the above [Heat resistant slipping layer composition liquid A] is coated thereon to a thickness of 1.0 μm when dried. The heat-resistant slipping layer 3 was formed by working, drying, and further heat aging and curing treatment.
As shown in FIG. 1, the back surface thereof is coated with [Ink A for thermal transfer color material layer] of Example 1 so as to have a thickness of 1.0 μm when dried and dried to form a thermal transfer color material layer 2. Example 2
A thermal transfer sheet of was obtained. [Composition liquid B for antistatic layer / primer layer] -Quaternary ammonium salt type acrylic resin PS-814 2.35 parts (manufactured by Nippon Kako Paint Co., Ltd.)-Water-soluble polyester WR-961 0.60 parts (Japan Synthetic Chemical Industry Co., Ltd.-Solvent Methanol 3.65 parts Alkaline water (pH 6.5 to 7.5 1.40 parts Methyl ethyl ketone 7.00 parts)

(Example 3) The following [antistatic layer / primer layer composition liquid C] of 0.5 μm was formed on one surface of a polyester film having a thickness of 6.0 μm as the base film 1.
To give a thickness of 10 .mu.m, and the antistatic layer 4 is provided by drying so that the thickness becomes 1.0 .mu.m when dried [the composition liquid A for heat-resistant slipping layer] described in Example 1. Then, the heat-resistant slipping layer 3 was formed by coating, drying, heat-aging and curing treatment. On the back side, [Ink A for thermal transfer color material layer] of Example 1 was applied so as to have a thickness of 1.0 μm when dried, and dried to form a thermal transfer color material layer 2 and the execution shown in FIG. A thermal transfer sheet of Example 3 was obtained. [Composition liquid C for antistatic layer / primer layer] -Quaternary ammonium salt type acrylic resin PS-818 1.85 parts (manufactured by Nippon Kako Paint Co., Ltd.)-Water-soluble polyester WR-961, 0.30 parts ( Nippon Synthetic Chemical Industry Co., Ltd.-Solvent Methanol 7.05 parts Alkaline water (pH 6.5 to 7.5) 0.70 parts Ethyl acetate 11.00 parts

(Example 4) As a base film 1, a composition film A for antistatic layer / primer layer described in Example 1 was applied to one side of a 6.0 μm thick polyester film to a thickness of 0.3 μm. And then dried, and the composition liquid B for heat-resistant slipping layer was applied on the upper layer so as to have a thickness of 0.9 μm when dried, and further accelerated voltage was 175 ke
The heat resistant slipping layer 3 was formed by irradiating an electron beam under the conditions of V and 3 Mrad to carry out a crosslinking and hardening treatment. The above-mentioned [Ink A for thermal transfer color material layer] is applied to the back surface so that the thickness becomes 1.0 μm when dried, and dried to form the thermal transfer color material layer 2 in the embodiment shown in FIG. A thermal transfer sheet of No. 4 was obtained. [Heat-resistant slipping layer composition liquid B] -Polyvinyl butyral S-Rex BX-1 1.60 parts (manufactured by Sekisui Chemical Co., Ltd.)-Polyfunctional monomer Kayarad DPHA 0.30 parts (Japanized) Yakuhin Kogyo Co., Ltd.-Phosphate ester surfactant, Surfer A208S 0.13 part (Daiichi Kogyo Seiyaku Co., Ltd.)-Talc Microace L-1 0.32 part (Nippon Talc Industry Co., Ltd. ))-Solvent Methyl ethyl ketone 13.51 parts Toluene 13.51 parts

(Example 5) As the base film 1, 0.3% of the composition liquid A for the antistatic layer / primer layer of Example 1 was applied to one side of a 6.0 μm thick polyester film.
Coating and drying so as to have a thickness of .mu.m is provided to provide the antistatic layer 4, and the [heat-resistant slipping layer composition liquid C] is dried on top of the antistatic layer 4.
Heat-resistant slipping layer 3 coated and dried to a thickness of 8 μm
Was formed. The back surface thereof was coated with [Ink A for thermal transfer coloring material] of Example 1 so as to have a thickness of 1.0 μm when dried,
By drying to form the thermal transfer color material layer 2, the thermal transfer sheet of Example 5 shown in FIG. 1 was obtained. [Heat resistant slipping layer composition liquid C] -Silicone / urethane copolymer SP-2105 27.05 parts (manufactured by Dainichiseika Kogyo Co., Ltd.)-Phosphate ester surfactant surfactant Surfer A208S 1.36 parts (Daiichi Kogyo Seiyaku Co., Ltd.)-Talc Microace L-1 0.32 part (Nippon Talc Industry Co., Ltd.)-Solvent Methyl ethyl ketone 29.90 parts Toluene 29.90 parts

(Comparative Example 1) The following [Primer layer composition liquid A] was coated on one surface of a 6.0 μm thick polyester film as the base film 1 to a thickness of 0.3 μm, After drying, the composition liquid A for heat resistant slipping layer of Example 1 was applied to the upper layer so as to have a thickness of 1.0 μm at the time of drying, dried, and then heat-aged for curing treatment. The conductive layer 3 was formed. The thermal transfer color material layer 2 was formed on the back surface by coating the above [thermal transfer color material layer ink A] to a thickness of 1.0 μm when dried, and the thermal transfer color material layer 2 was formed. -I got it. [Composition liquid A for primer layer] -Polyester Nichigo Polyester: LP-035 10.0 parts (manufactured by Nippon Synthetic Chemical Industry Co., Ltd.)-Solvent Methyl ethyl ketone 90.0 parts

(Comparative Example 2) The following [primer layer composition liquid B] was applied to one surface of a polyester film having a thickness of 6.0 μm as the base film 1 so as to have a thickness of 0.3 μm, After drying, the composition layer A for the heat resistant slipping layer of Example 1 was applied to the upper layer and dried so as to have a thickness of 1.0 μm. Layer 3 was formed. In comparison with Comparative Example 2, the back surface thereof was coated with [Ink A for thermal transfer color material layer] described in Example 1 to a thickness of 1.0 μm when dried and dried to form the thermal transfer color material layer 2. A thermal transfer sheet was obtained. [Composition liquid B for primer layer] -Water-soluble polyester Nichigo Polyester WR-961 10.0 parts (Nippon Synthetic Chemical Industry Co., Ltd.)-Solvent Alkaline water (pH 6.5-7.5) 90.0 parts

(Comparative Example 3) As the base film 1.
On one side of a 0 μm polyester film, the following [Antistatic layer composition liquid A] was applied to a thickness of 0.3 μm and dried, and the upper layer thereof [heat-resistant lubricity described in Example 1 was used. The layer composition liquid A] was applied and dried so as to have a thickness of 1.0 μm when dried, and then heat-aged and cured to form the heat resistant slipping layer 3. Comparative Example 3 was prepared by applying [Ink A for thermal transfer color material layer] described in Example 1 on the back surface thereof to a thickness of 1.0 μm when dried and forming a thermal transfer color material layer 2 by drying. To obtain a thermal transfer sheet. [Antistatic Layer Composition Liquid A] Quaternary ammonium salt type acrylic resin PS-818 10.0 parts (Nippon Kakoh Co., Ltd.) Solvent ethyl acetate 20.0 parts Methanol 70.0 parts

The thermal transfer sheets of Examples and Comparative Examples were evaluated by the following methods, and the results of evaluation of the adhesion of the antistatic layer to the base film and the heat resistant slipping layer, the half-life of charge decay and the surface resistivity were shown. It shows in Table 1. [Evaluation Method 1] (Adhesiveness) A base film is coated with an antistatic layer and a heat resistant slipping layer, dried, and heat-cured at 60 ° C., then affixed with a mending tape on the surface and peeled off when peeled off. The condition was evaluated. ○: No peeling ×: Peeling [Evaluation method 2] (Charge decay) STATIC HONESMETER
(H-0110: SHISHIDO ERECTROST
ATIC, LTD. ) Is applied to the film surface at 25 ° C. and 40% RH to apply a voltage of 10 kV to 3 kV.
Was measured as the saturation (half-life) required to decay to 1.5 kV. [Evaluation method 3] (Surface resistivity) High resistivity meter (MCP-H
T250: Hiresra IP, manufactured by Mitsubishi Petrochemical Co., Ltd.
Was used to measure the surface resistance value per unit area in an environment of 25 ° C. and 30% RH.

[0029]

[Table 1] Evaluation results

[0030]

By providing a layer composed of a water-soluble polyester and a quaternary ammonium salt type acrylic resin system between the substrate film and the heat resistant slipping layer or the heat transfer coloring material layer,
Not only the antistatic effect was obtained, but also the thermal transfer sheet was able to be constructed with good adhesion between the base film and the heat resistant slipping layer or the thermal transfer coloring material layer.

[Brief description of drawings]

FIG. 1 is a schematic sectional view showing a layer structure of a thermal transfer sheet of the present invention.

[Explanation of symbols]

 1 Base Material Film 2 Thermal Transfer Coloring Material Layer 3 Heat Resistant Sliding Layer 4 Antistatic Layer

Claims (3)

[Claims] 1. A thermal transfer sheet having a heat transfer coloring material layer on one surface of a base film and a heat resistant slipping layer formed on the other surface, wherein the base film and the heat resistant slipping layer or A thermal transfer sheet, characterized in that at least one antistatic layer comprising a water-soluble polyester and a quaternary ammonium salt type acrylic resin is provided between the thermal transfer color material layer and the thermal transfer color material layer. 2. The resin system of the antistatic layer, wherein the water-soluble polyester is 10 to 70% by weight of the solids of the antistatic layer,
The thermal transfer sheet according to claim 1, wherein the quaternary ammonium salt type acrylic resin contains 30 to 90% by weight. 3. The heat transfer sheet according to claim 1, wherein the heat transfer color material layer is a sublimable dye layer or a heat melting ink layer.