JPH1035121A - Thermal transfer sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thermal transfer sheet which is well compatible with a binder resin forming a heat-resistant lubricative layer and is highly responsive to heat in terms of lubricity and mold parting properties when low migratory lubricant is used, and hardly generates head tailings even after heating by a thermal head and cooling. SOLUTION: This thermal transfer sheet consists of a thermal transfer coloring material layer formed on one of the faces of base film and a heat-resistant lubricative layer formed on the other face. In addition, the heat-resistant lubricative layer contains a chemical compound expressed by formula: [In the formula, R1-4 is OC1 H1+2 or (OCH2 CH2 )n OCn Hn+2 , or (OCH2 CH2 )n OC OCn Hn+2 , or OH. However, 1=8-20, m=1-10, n=1-20].

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermal transfer sheet, and more particularly, to a thermal transfer sheet having a heat-resistant lubricating layer made of a specific material, having excellent heat responsiveness such as lubricity and releasability, and heating by a thermal head. The present invention relates to a thermal transfer sheet that does not generate head residue even after cooling.

[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. A sublimation type thermal transfer sheet provided with a layer and a thermal fusion type thermal transfer sheet provided with a thermal melting ink layer made of a thermal melting composition containing a coloring agent instead of the dye layer are known. These thermal transfer sheets are heated imagewise from the back by a thermal head, and transfer the dye of the dye layer or the heat-meltable ink layer to the material to be transferred to form an image.

Further, when a material which is melted by heat from a thermal head, such as a plastic film, is used as a base film in a conventional thermal transfer sheet, peeling and slipping from the thermal head during image formation are impaired,
Problems such as breakage of the base film occurred. In order to solve such a problem, a heat-resistant lubricating layer is formed by using a modified resin such as a thermosetting resin or a silicone resin alone or in combination with various crosslinking agents on the surface opposite to the surface of the thermal transfer color material layer of the base film. Methods of forming have been taken. However, as the printing speed of the printer has been increased and the image quality has been improved, further heat resistance and lubricity have been required for the heat-resistant lubricating layer. Therefore, it has been proposed to add a lubricant such as a surfactant having lubricity or heat releasing property, an oil, an organic metal salt or a wax to the heat-resistant lubricating layer.

[0004]

In forming an image with a thermal head using the thermal transfer sheet, when a print energy corresponding to each print density is applied to the thermal transfer sheet, stable lubricity and stability can be obtained in all energy ranges. Releasability is required. However, when the added lubricant is a liquid, the compatibility with the binder resin forming the heat-resistant lubricating layer is inferior, or when the lubricant is a low-viscosity liquid, the lubricant is used during a manufacturing process or a processing process. Is transferred to the opposite surface of the base film or to the transport roll, etc., and the heat-resistant lubricating layer of the thermal transfer sheet in the final product cannot secure a sufficient amount of lubricant, resulting in a decrease in lubricity or When it is wound, there is a problem that the dye or the like of the thermal transfer color material layer which overlaps with the heat-resistant lubricating layer migrates to the heat-resistant lubricating layer and contaminates the heat-resistant lubricating layer.

When the lubricant is solid or wax,
Problems such as poor response to instantaneous heating, insufficient lubricity and releasability, and accumulation of head chips when cooling after heating with a thermal head, affecting the printed image Also occurred. Therefore, an object of the present invention is to provide a heat-responsive material having excellent compatibility with a binder resin forming a heat-resistant lubricating layer and having a low migration property, such as lubricity and releasability. An object of the present invention is to provide a thermal transfer sheet in which head debris hardly occurs even after heating and cooling by the head.

[0006]

The above object is achieved by the present invention described below. That is, the present invention provides a heat transfer sheet having a heat transfer color material layer on one surface of a base film and a heat resistant slip layer formed on the other surface, wherein the heat resistant slip layer has the following general formula: Characterized by containing a compound represented by the formula:

[Wherein R _1-4 is OC ₁ H _{l + 2} or (OC
_{H 2 CH 2) m OC n} H n + 2 , or, (OCH ₂ C
It represents an _{H 2) m OCOC n H n} + 2 , or OH,. However,
1 = 8-20, m = 1-10, n = 1-20] Further, the thermal transfer color material layer is a dye layer or a heat-meltable ink layer. Further, the heat-resistant lubricating layer contains an organic or inorganic filler. Further, the heat-resistant lubricating layer is characterized by using a lubricant other than the compound represented by the above general formula.

[0007]

The transferability of the heat-resistant lubricating layer of the thermal transfer sheet is low due to the compatibility with the binder resin of the heat-resistant lubricating layer and the use of a reactive compound of an organic phosphate and a titanium chelate as a lubricant. In addition to low contamination by dyes, it has excellent responsiveness in terms of heat lubricity and releasability, and does not cause head residue even after heating and cooling.

[0008]

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.
0.5 to 50 μm, preferably about 3 to 10 μm thick polyethylene terephthalate film, 1,4-polycyclohexylene dimethylene terephthalate film, polyethylene naphthalate film, polyphenylene sulfide film, polystyrene film, polypropylene film, polysulfone film, Cellulose derivatives such as aramid film, polycarbonate film, polyvinyl alcohol film, cellophane, cellulose acetate, etc., resin films such as polyethylene film, polyvinyl chloride film, nylon film, polyimide film, ionomer film, condenser paper, paraffin paper etc. It may be paper or nonwoven fabric, or a composite of paper or nonwoven fabric and resin.

(Heat-resistant lubricating layer) The heat-resistant lubricating layer formed on one surface of the base film is made of a binder resin and a lubricant comprising at least one reaction product of an organic phosphate and a titanium chelate. And, if necessary, other additives. The binder resin forming the heat-resistant lubricating layer is not particularly limited, and may be a thermoplastic resin or a thermosetting resin alone or in the case of having a reactive group in these resins. The reaction product may be a reaction product with various isocyanate curing agents or monomers or oligomers having an unsaturated bond, 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.

Preferred binder resins include, for example, polyester resins, polyacrylate resins, polyvinyl acetate resins, styrene acrylate resins, polyurethane resins, polyolefin resins, polystyrene resins, and polyvinyl chloride resins. , Polyether resin, polyamide resin, polycarbonate resin,
Polyethylene resins, polypropylene resins, polyacrylate resins, polyacrylamide resins, polyvinyl chloride resins, polyvinyl butyral resins, polyvinyl acetoacetal resins, oily polyols and the like, among which, particularly preferred resins are polyvinyl acetoacetal resins and the like. It is a polyvinyl acetal resin. Examples of the modified resin include various modified silicone resins available on the market, 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 acrylic polyol or an acetal resin.

In the present invention, a polyisocyanate can be used in combination as a crosslinking agent for the purpose of imparting heat resistance, coating properties and adhesion to a substrate film to the heat-resistant lubricating layer.
Conventionally known paints as these polyisocyanates,
It may be an adhesive or any polyisocyanate used in the synthesis of polyurethanes. These polyisocyanate compounds include, for example, Takenate (manufactured by Takeda Pharmaceutical Co., Ltd.), Vernock (manufactured by Dainippon Ink and Chemicals, Inc.), Coronate (manufactured by Nippon Polyurethane Industry Co., Ltd.), Duranate (manufactured by Asahi Chemical Industry Co., Ltd.), It can be obtained under a trade name such as DisModule (manufactured by Bayer) and used in the present invention.

The amount of the polyisocyanate added is 5 to 2 parts by weight per 100 parts by weight of the binder resin constituting the heat-resistant lubricating layer.
A range of 80 parts by weight is suitable. The ratio of -NCO / -OH is preferably in the range of about 0.6 to 2.0. If the amount of the polyisocyanate is too small, the crosslinking density is low and the heat resistance is insufficient. On the other hand, if the amount is too large, the shrinkage of the formed coating film cannot be controlled, and the curing time becomes long. When remaining in the heat-resistant lubricating layer, it may have a negative effect on the performance of the thermal transfer sheet, such as reacting with moisture in the air or reacting with a binder resin or dye of the thermal transfer color material layer.

A monomer or oligomer having an unsaturated bond for the purpose of imparting heat resistance, coating properties and adhesion to a base film to the heat-resistant lubricating layer in place of or in combination with the isocyanate. Can be used in combination as a crosslinking agent. When using a monomer or oligomer having an unsaturated bond as a cross-linking agent, the curing method may be either electron beam or UV irradiation curing, but when the filler addition amount is large, curing by electron beam irradiation is desirable. . As the monomer or oligomer having an unsaturated bond, for example, tetraethylene glycol di (meth) acrylate ｛(meth) acrylate means both acrylate and methacrylate. The same applies to the following ①, bifunctional monomers such as divinylbenzene and diallyl phthalate, trifunctional monomers such as triallyl isocyanurate and trimethylolpropane tri (meth) acrylate, tetramethylolmethanetetra (meth) acrylate, trimethoxyethoxyvinylsilane and the like. And penta- or higher functional monomers, and oligomers and macromers composed of these monomers.

The reaction product of the organophosphate ester and the titanium chelate, which is a lubricant used in the present invention, can be obtained by the following reaction.

Embedded image R _k : OC ₁ H _{l + 2} or (OCH ₂ CH ₂ ) _m O
C _n H _{n + 2, or, (OCH 2 CH 2) m} OCOC n H
_{n + 2} or OH, where k = 1 to 4, l = 8 to 20, m
_{= 1~10, n = 1~20 R 5} : (OC x H x + 2) y, or (NO _{x /} 2 C _x H
_{x + 2} ) _y, where x = 1 to 8, y = 2 to 4

In the above reaction, examples of the organic phosphoric acid ester to be used include various phosphoric acid esters. Specific examples include the Plysurf series of Daiichi Kogyo Seiyaku, the JP series of Johoku Chemical Co., and NIK of Nikko Chemical.
KOL DDP series, etc. Examples of titanium chelating agents include Organix TC series of Matsumoto Trading, Nippon Soda, and TAA, TLA, TE of Mitsubishi Gas Chemical.
AA, TEAT, TAT, TBSTA and the like can be mentioned.

By adding one or more of these compounds, sufficient lubricity and releasability can be obtained. The amount added is the binder resin 1
The amount is 1 to 100 parts by weight, preferably 2 to 50 parts by weight with respect to 00 parts by weight, but when used in combination with a curing agent or the like, the amount added is 1 to 100 parts by weight of the binder resin. To 150 parts by weight, preferably 50 to 120 parts by weight.
Parts by weight. If the addition amount is small, sufficient thermal releasability from the thermal head cannot be obtained, causing print wrinkles, heads, and sticking.If the addition amount is too large, cooling is performed after heating with the thermal head. When
It may accumulate as head debris and affect the printed image.

In some cases, the performance is further improved.
It is also possible to use together with other lubricants to stabilize,
As the lubricant, a phosphate ester surfactant, polyethylene phenyl polysiloxane, 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, perfluoroalkyl ethylene oxide adducts, nonionic surfactants such as sorbitanate esters, and long-chain alkyl sulfonate sodium salts. No. As the amount to use,
5 to 10 based on 100 parts by weight of the reaction product
0 parts by weight, preferably 5 to 50 parts by weight.

In the present invention, it is desirable to use an inorganic or organic filler in order to stabilize the processability of the thermal transfer sheet and the printing running property and to impart a cleaning property to the thermal head. In selecting the filler, it is required that the filler has a particle size and shape sufficient to form an uneven shape on the surface of the heat-resistant lubricating layer, and that the thermal head has little wear. Suitable fillers for use include, for example, inorganic fillers such as talc, kaolin, clay, calcium carbonate, magnesium hydroxide, magnesium carbonate, magnesium oxide, precipitated barium sulfate, molybdenum disulfide, hydrotalcite silica, and acrylic. Organic fillers made of resin, benzoguanamine resin, silicone resin, fluorine-based resin, and the like can be used, but those having lubricity, low hardness, and cleaning properties for a thermal head are preferable.

Further, instead of dispersing these fillers directly in the binder resin, a mixture in which the filler has good wettability and is relatively dispersed in a dispersing medium such as a resin or a surfactant having a relatively low viscosity is used. It is preferable to use them. The dispersion medium is, for example, Uniol TG manufactured by NOF Corporation
Polyether polyols such as -1000, -2000, and -3000; Olester C1000 and C1 manufactured by Mitsui Toatsu;
066, polyurethane-based resins, PEG and various surfactants. As a method of forming a heat-resistant lubricating layer, a solvent such as acetone, methyl ethyl ketone, toluene, xylene or the like selected from the above materials suitable for coating, or dissolved or dispersed in water to prepare a coating liquid, A method of applying, drying, and solidifying the coating liquid by a conventional coating means such as a gravure coater, a roll coater, and a wire bar to form a film. As a coating amount, i.e. the thickness of the heat-resistant lubricating layer may have 3.0 g / m ² or less on a solids basis, heat preferably has a sufficient performance in a thickness of 0.1 to 1.0 g / m ² A lubricating layer can be formed. When a polyisocyanate is used in combination, unreacted isocyanate groups often remain in the layer even after the coating liquid is applied and dried, so that heat aging treatment is performed to complete the reaction. Is preferred.

It is also effective to provide a primer layer before forming the heat-resistant lubricating layer. The primer layer desirably has sufficient adhesiveness to the substrate and the heat-resistant lubricating layer, and also has heat resistance and dimensional stability to suppress thermal deformation of the substrate. This primer layer may be any of a thermoplastic resin, various thermosetting resins, a mixed composition of various curing agents and a resin having a reactive group, and a coating composition that causes a crosslinking reaction by light and ionizing radiation,
1.0 g / m ² or less on a solids basis for coating weight, preferably from the thickness of 0.1 to 0.5 g / m ^2.

(Thermal transfer color material layer) As the thermal transfer color 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 sublimable dye is formed. In the case of a fusion-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 G,
Macro Red Violet®, Ceres®
ed 7B, Samaron Red HBSL, Re
solinRed F3BS, etc., and as a yellow dye, Holon Brilliant Yellow 6GL, P
TY-52, Macrolex Yellow 6G, etc., and as the blue dye, Kayaset Blue 714,
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 5.0 μm.
The thickness of the sublimable dye in the dye layer is 5 to 90% by weight, preferably 1 to 90% by weight of the dye layer.
Suitably it is present in an amount of 0 to 70% by weight. 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, selecting appropriate cyan, magenta and yellow (and black if necessary),
Magenta and cyan (and, if necessary, black) dye layers are formed.

The image-receiving sheet used to form 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.

[0025]

EXAMPLES Next, the present invention will be described more specifically with reference to Reference Examples, Examples and Comparative Examples. In the following description, parts and% are based on weight unless otherwise specified. (Reference Example 1) 100 parts of Plysurf A208S (manufactured by Dai-ichi Kogyo Seiyaku) was reacted with 42 parts of Orgatechx TC-400 (manufactured by Matsumoto Trading) to obtain a compound solution having a solid content of 94%. (Reference Example 2) 100 parts of JP-510 (manufactured by Johoku Chemical)
44 parts of ORGATICS TC-400 (manufactured by Matsumoto Trading) were reacted to obtain a compound solution having a solid content of 92%. (Reference Example 3) 44 parts of TAA (manufactured by Nippon Soda) were reacted with 100 parts of NIKKOL (manufactured by Nikko Chemical) to obtain a solid content of 9 parts.
A 2% compound solution was obtained. (Reference Example 4) 50 parts of Plysurf A208S (Daiichi Kogyo Seiyaku Co., Ltd.) and JP-518-O (Johoku Chemical)
50 parts were reacted with 42 parts of TEAT (manufactured by Mitsubishi Gas Chemical) to obtain a compound solution having a solid content of 94%.

Example 1 4.5 μm as a base film
The following coating liquid A for a heat-resistant lubricating layer was applied to a m-thick polyester film so as to be about 1.0 g / m ² when dried, and dried to form a heat-resistant lubricating layer. Coating solution A composition for heat-resistant lubricating layer Polyvinyl acetoacetal resin 3.6 parts (Sekisui Chemical Co., Ltd., Eslec KS-5) 3.0 parts of solution of Reference Example 1 Talc (Nihon Talc, Micro) Ace P-3) 0.2 parts Toluene 11.0 parts Ethyl acetate 11.0 parts

On a substrate film surface opposite to the heat-resistant lubricating layer, a dye layer-forming ink having the following composition was dried to 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 following coating solution B was used in place of the coating solution for a heat-resistant lubricating layer in Example 1, and the coating and drying were performed, followed by further heat aging and curing. In the same manner as in Example 1, a thermal transfer sheet of Example 2 of the present invention was obtained. 4.3 parts of coating liquid B composition for heat-resistant lubricating layer Polyvinyl acetoacetal resin (KS-5, manufactured by Sekisui Chemical Co., Ltd.) 19.2 parts of polyisocyanate (manufactured by Dainippon Ink and Chemicals, Inc., Burnock D750-45) 6.5 parts of the solution of Reference Example 1 0.3 parts of an oil-based polyol (Olester C1066, manufactured by Mitsui Toatsu Chemicals, Inc.) 0.2 part of kaolin (ASP-072, Kaolinite ASP-072, manufactured by Tsuchiya Kaolin) 28 parts of methyl ethyl ketone 2.0 parts Toluene 28.0 parts

(Example 3) The following coating solution C was used in place of the coating solution for a heat-resistant lubricating layer of Example 1, and after application and drying, an electron beam was further irradiated under the conditions of an acceleration voltage of 175 keV and 3 Mrad. A heat transfer sheet of Example 3 of the present invention was obtained in the same manner as in Example 1 except that the cross-linking and curing treatment was performed. 4.3 parts of coating liquid C composition for heat-resistant lubricating layer Polyvinyl acetoacetal resin (KS-5, manufactured by Sekisui Chemical Co., Ltd.) Polyfunctional monomer (Kayarad DPHA, manufactured by Nippon Kayaku Co., Ltd.) 0.7 part Solution of Reference Example 2 5.0 parts Nonionic surfactant 0.3 part (Nonion-OP85R manufactured by NOF Corporation) Clay (ASP-200 manufactured by Tsuchiya Kaolin) 0.2 part Toluene 12 0.0 parts Ethyl acetate 12.0 parts

Example 4 The thermal transfer of Example 4 of the present invention was carried out in the same manner as in Example 1 except that the following coating liquid D was used instead of the coating liquid for a heat-resistant lubricating layer of Example 1. I got a sheet. Coating liquid D composition for heat-resistant lubricating layer 4.3 parts of polyvinyl acetoacetal resin (KS-5, manufactured by Sekisui Chemical Co., Ltd.) 4.0 parts of solution of Reference Example 3 Talc (Microace manufactured by Nippon Talc) P-3) 3.2 parts Toluene 10.0 parts Ethyl acetate 10.0 parts

(Example 5) The thermal transfer of Example 5 of the present invention was carried out in the same manner as in Example 1 except that the following coating liquid E was used instead of the coating liquid for a heat-resistant lubricating layer of Example 1. I got a sheet. Coating solution E for heat-resistant lubricating layer E Composition acrylic polyol resin (manufactured by Soken Chemical Co., SU-100A) 4.6 parts Polyisocyanate 56.3 parts (manufactured by Dainippon Ink and Chemicals, Inc., Burnock D750-45) Reference Example 4 Solution 13.0 parts Polyether polyol 0.3 parts (manufactured by NOF Corporation, Uniol TG4000) Kaolin (manufactured by Tsuchiya Kaolin, Kaolinite ASP-072) 0.2 parts Methyl ethyl ketone 28.0 parts Toluene 28.0 parts

Example 6 The thermal transfer of Example 6 of the present invention was performed in the same manner as in Example 1 except that the following coating liquid F was used instead of the coating liquid for a heat-resistant lubricating layer of Example 1. I got a sheet. 4.3 parts of coating liquid F for coating composition for heat-resistant lubricating layer Polyvinyl acetoacetal resin (KS-5, manufactured by Sekisui Chemical Co., Ltd.) 19.2 parts of polyisocyanate (manufactured by Dainippon Ink and Chemicals, burnock D750-45) 6.5 parts of solution of Reference Example 3 6.5 parts of solution of Reference Example 4 0.3 parts of oil-based polyol (Olester C1066, manufactured by Mitsui Toatsu Chemicals, Inc.) Kaolin (Kaolinite ASP, manufactured by Tsuchiya Kaolin) -072) 0.2 part Methyl ethyl ketone 28.0 parts Toluene 28.0 parts

(Comparative Example 1) The following coating solution G was used in place of the coating solution for a heat-resistant lubricating layer of Example 1, and the coating and drying were performed, followed by further heat aging and curing. A thermal transfer sheet of Comparative Example 1 was obtained in the same manner as in Example 1. 4.3 parts of coating liquid G composition for heat-resistant lubricating layer Polyvinyl acetoacetal resin (KS-5, manufactured by Sekisui Chemical Co., Ltd.) 19.2 parts of polyisocyanate (manufactured by Dainippon Ink and Chemicals, Inc., Burnock D750-45) Phosphate ester lubricant 13.0 parts (Daiichi Kogyo Seiyaku Co., Ltd., Plysurf A208B) Oily polyol (Mitsui Toatsu Chemical Co., Ltd., Olester C1066) 0.3 part Kaolin (Tsuchiya Kaolin, Kaolinite ASP-072) 0.2 parts Methyl ethyl ketone 28.0 parts Toluene 28.0 parts

(Comparative Example 2) The following coating liquid H was used in place of the coating liquid for a heat-resistant lubricating layer of Example 1, and the coating and drying were performed, followed by further heat aging and curing. A thermal transfer sheet of Comparative Example 2 was obtained in the same manner as in Example 1. 4.3 parts of coating liquid H composition polyvinyl acetoacetal resin for heat-resistant lubricating layer (KS-5, manufactured by Sekisui Chemical Co., Ltd.) 19.2 parts of polyisocyanate (manufactured by Dainippon Ink and Chemicals, Inc., Burnock D750-45) Phosphate ester lubricant (J-Kita Chemical, JP-510) 13.0 parts Nonionic surfactant 0.3 part (Non-OP85R, manufactured by NOF CORPORATION) Clay (Tsuchiya Kaolin, ASP- 200) 0.2 parts Methyl ethyl ketone 33.0 parts Toluene 33.0 parts

(Comparative Example 3) The following coating solution I was used in place of the coating solution for a heat-resistant lubricating layer of Example 1, and the coating and drying were performed, followed by further heat aging and curing. A thermal transfer sheet of Comparative Example 3 was obtained in the same manner as in Example 1. 4.3 parts of coating liquid I composition for heat-resistant lubricating layer Polyvinyl acetoacetal resin (KS-5, manufactured by Sekisui Chemical Co., Ltd.) 19.2 parts of polyisocyanate (Barnock, manufactured by Dainippon Ink and Chemicals, Inc.) D750-45) Phosphoric ester lubricant (NIKKOL, manufactured by Nikko Chemical) 13.0 parts Talc (Microace P-3, manufactured by Nippon Talc) 0.2 parts Methyl ethyl ketone 33.0 parts Toluene 33.0 parts

(Comparative Example 4) The following coating solution J was used in place of the coating solution for the heat-resistant lubricating layer of Example 1, and after coating and drying, further irradiated with an electron beam under the conditions of an acceleration voltage of 175 keV and 3 Mrad. A thermal transfer sheet of Comparative Example 4 was obtained in the same manner as in Example 1 except that the crosslinking and curing treatment was performed. 4.3 parts of coating liquid J composition polyvinyl acetoacetal resin for heat-resistant lubricating layer (KS-5, manufactured by Sekisui Chemical Co., Ltd.) Polyfunctional monomer (Kayarad DPHA, manufactured by Nippon Kayaku Co., Ltd.) 0.7 parts Phosphate ester lubricant (NIKKOL, manufactured by Nikko Chemical) 5.0 parts Nonionic surfactant 0.3 part (Nonion-OP85R, manufactured by NOF Corporation) Clay (ASP-200 manufactured by Tsuchiya Kaolin) 0.2 parts Toluene 12.0 parts Ethyl acetate 12.0 parts

With respect to each of the above Examples and Comparative Examples, non-uniformity in feed color, print wrinkles, head residue, and dye contamination were evaluated. The evaluation method will be described below. Evaluation method 1. Feeding color unevenness After storing for 48 hours in a 40 ° C atmosphere in a small wound product form, a commercially available video printer and pattern generator (KENWOOD, C
G-931), a light-colored three-color superimposed solid print pattern was printed, and the degree of unevenness in the feed color was visually evaluated. still,
The environment at the time of printing was normal temperature and normal humidity. ：: There is almost no unevenness in feed color. X: The feed color unevenness is remarkable.

2. Print wrinkles After storing for 48 hours in an atmosphere of 40 ° C in a small wound product form, adjust the pressing pressure of the thermal head so that the pressure becomes uneven, and use a pattern generator ( Made by KENWOOD, CG
−931), a light solid print pattern at 30 ° C., 8
Printing was performed under an environment of 0% RH, and the evaluation was made visually. ：: No print wrinkles △: Fine wrinkles at edges ×: Large horizontal wrinkles

3. Head waste Commercially available video printer and pattern generator (K
After continuously printing 50 step patterns of 8 gradations using CG-931) manufactured by ENWOOD, the vicinity of the heat generating portion of the thermal head was visually observed to confirm the presence or absence of head chipping. ：: No head residue attached △: Some head residue attached ×: Head residue attached

4. Dye Stainability After being stored in a small wound product form in a 60 ° C. atmosphere for 48 hours, evaluation was made based on the degree of dye transferred to the heat-resistant lubricating layer. ：: There is almost no transfer of the dye. X: Dye is transferred significantly.

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

[Table 1]

[0042]

As described above, according to the present invention, the lubricity of the heat-resistant lubricating layer of the thermal transfer sheet is improved by using a lubricant having good compatibility with the binder resin of the heat-resistant lubricating layer and low migration property. A heat transfer sheet which is excellent in heat responsiveness in terms of heat release and releasability, does not generate head debris even after heating and cooling, does not wrinkle during printing, and gives a high quality image can be provided.

Claims (4)

[Claims] 1. A heat transfer sheet having a heat transfer color material layer on one surface of a base film and a heat resistant slip layer formed on the other surface, wherein the heat resistant slip layer is represented by the following general formula: A thermal transfer sheet comprising the compound represented by the formula (1). Embedded image [Wherein R _1-4 is OC ₁ H _{l + 2} or (OCH ₂ CH
_{2) m OC n H n +} 2 or _{(OCH 2 CH 2,) m} OC
Representing the OC _n H _{n + 2,} or OH,. However, l = 8-2
0, m = 1-10, n = 1-20] 2. The thermal transfer sheet according to claim 1, wherein the thermal transfer color material layer is a dye layer or a hot-melt ink layer. 3. The thermal transfer sheet according to claim 1, wherein the heat-resistant lubricating layer contains an organic or inorganic filler. 4. The thermal transfer sheet according to claim 1, wherein the heat-resistant lubricating layer uses a lubricant other than the compound represented by the general formula.