JPH07125455A - Thermal transfer image receiving sheet - Google Patents

Abstract

PURPOSE:To provide an image receiving sheet not generating curling caused by thermal transfer printing and recording a high density sharp color transfer image. CONSTITUTION:A thermal transfer image receiving sheet is obtained by forming a sublimable dye receiving layer containing a polyurethane carbonate resin as a main component on the surface of a sheet like base material 1 and forming a rear surface coating layer containing a release agent on the rear surface of the base material 1 if necessary.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dye thermal transfer image-receiving sheet for a printer which transfers a sublimable disperse dye image by heat to form a dyed image. More specifically, the present invention relates to a thermal transfer image-receiving sheet for printing a full-color image excellent in transfer density by a dye thermal transfer printer.

[0002]

2. Description of the Related Art Recently, thermal printers, especially dye thermal transfer printers, which can print compact and clear full-color images, have been attracting attention. Such dye thermal transfer printers are often used for video printers as a mainstream of small non-impact full color printers.

In the dye thermal transfer printer, the surface of the dye-dyeable resin coating layer of the image receiving paper is superposed on the surface of the ink sheet on which the yellow, magenta, or cyan dye ink is applied, and the thermal head is operated in response to an electric signal. The supplied heat transfers and dyes a required concentration of dye from a required portion of the sublimation dye ink layer of the ink sheet to form an image on the image receiving paper.

An image receiving sheet capable of obtaining a clear image has been developed for a printer using such a thermal head. For example, it is known to use a stretched film having a void structure containing a thermoplastic polymer such as polyolefin as a main component as a base material. These sheets have the advantage that uniform and high-density prints can be obtained, probably because the sheets have uniform thickness, are flexible, and have lower thermal conductivity than paper containing cellulose fibers as a main component.

However, when an image-receiving sheet containing a stretched film as a substrate is subjected to a thermal transfer operation, the stretching stress of the image-receiving sheet substrate is generated by heating and the film shrinks heat, resulting in curling or wrinkling of the image-receiving sheet. When it occurs, it causes a running trouble in the printer, which has a drawback that the commercial value of the thermal transfer print product is remarkably reduced.

In order to improve this, it is known that a base material having a small heat shrinkability such as paper is used as a core material, and the stretched film is laminated and adhered on one surface of the core material to form a base material for an image receiving sheet. There is. However, when paper containing pulp as a main component is used as a core material, expansion and contraction of the paper due to humidity causes curling of the image receiving paper. Therefore, as a measure against the above problems, a stretched film is attached to both surfaces of a core material to form a base material.

Generally, an image-receiving layer having a high dye-dyeability is required in order to receive a dye and reproduce an image vividly on an image-receiving paper. As the resin used for the image receiving layer, polyester resins, vinyl chloride-vinyl acetate copolymers, cellulose derivative resins, polycarbonate resins and the like are known. However, there is a strong demand for further improvement of an image-receiving sheet that has good receptivity to a dye thermal transfer image, does not cause curling or wrinkling, and has no (or little) running trouble in the printer, and is satisfactory in practice. .

[0008]

SUMMARY OF THE INVENTION The present invention is capable of receiving clear dye thermal transfer images with high print density,
Another object of the present invention is to provide an image-receiving sheet for dye thermal transfer, which is free from curling and wrinkling due to printing operation and has excellent running property in printing.

[0009]

In view of the present situation, the present inventors have no fear of running such as thermal curl after printing and heavy running due to static electricity when used in a thermal printer such as dye thermal transfer. High print density on the image receiving surface,
The inventors have diligently studied a dye thermal transfer image-receiving sheet capable of obtaining a clear image, and have found the dye thermal transfer image-receiving sheet of the present invention.

The image-receiving sheet for thermal transfer according to the present invention comprises a film-like substrate and an image-receiving layer formed on at least one surface thereof and containing a polyurethane carbonate resin as a main component for receiving a thermal transfer sublimation dye image. It is characterized by having. The thermal transfer image-receiving sheet of the present invention may further have a back surface coating layer formed on the opposite surface of the film-shaped substrate and containing a release agent and a binder resin.

[0011]

The image-receiving sheet used in the dye thermal transfer system has a structure in which a dye-staining receptive layer, an antistatic layer, an anti-fusing layer and the like are provided on at least one side of a base material sheet. In most cases, the film-shaped substrate used for the image-receiving sheet is formed by laminating plastic sheets, and therefore has a laminated structure that often avoids deformation due to heating during printing of the image-receiving sheet. . A typical example of the plastic sheet used is synthetic paper.

A stretched void structure film containing an inorganic pigment and a thermoplastic resin such as polyolefin as main components is known as synthetic paper and is used for printing and writing printers. Using this synthetic paper as an image receiving sheet for thermal transfer printers, including dye thermal transfer systems,
It is also known to obtain a uniform and clear transferred image. Recording by heating with a thermal head, sublimation dye transfer,
In any method such as leuco coloring, an image is formed by local heating from one side, so curling occurs due to local heat shrinkage of the film-shaped substrate, but a sheet with a small heat shrinkage rate is simply laminated to this. It is possible to control the occurrence of curling of the image receiving sheet.

The present synthetic paper is manufactured by a method in which a thermoplastic resin film containing an inorganic pigment is laminated on a base film which is uniaxially stretched in the longitudinal direction, and the resulting laminated sheet is stretched in the transverse direction. Contains many inorganic pigments,
In addition, there is also one in which a surface coat layer for improving printability is provided on a biaxially stretched substrate. In each case, the thermoplastic resin film is stretched to generate microvoids in the film.

Therefore, in such a synthetic paper, the base film is biaxially stretched, and the paper-like layer film on the surface is uniaxially stretched. Since the paper-like layer film forms microvoids in the vicinity of the filler when stretched, writability and a texture close to that of natural paper can be obtained. In this case, as the inorganic pigment for filler, white clay, talc, asbestos, gypsum, barium sulfate, diatomaceous earth, silicon oxide or other white pigments may be used alone or in combination.

As the thermoplastic resin used in the synthetic paper, a polyolefin resin, for example, a homopolymer or copolymer of ethylene, propylene or butene-1, etc., a polyvinylidene resin, for example, a vinylidene chloride homopolymer or copolymer. Polymers, styrene homopolymers or copolymers, other polyesters, nylons and the like can be used alone or as a mixture of two or more thereof. In addition, the base material-forming resin may contain a stabilizer, a plasticizer, a filler, a pigment, and other auxiliary materials in a stretchable range, if necessary.

The base film preferably contains a filler in an amount of 0 to 3% by weight. Filler content 3% by weight
When the amount is larger, the strength which is originally the main role of the base material may be insufficient. The thermoplastic resin used for forming the paper-like layer film can be the same as or different from the resin for the base film. The paper-like layer film may contain a filler in an amount of 5 to 60% by weight.
At this time, if the content of the filler is less than 5% by weight, the resulting synthetic paper may have insufficient characteristics of writing property, printability, and feel, and if it is more than 60% by weight. Not only the lack of the filler becomes remarkable from the obtained paper-like layer film, but also the strength of the obtained paper-like layer film is insufficient and cracks may occur in the paper-like layer film during stretching.

As a sheet to be laminated on the stretched thermoplastic polymer sheet for synthetic paper, it is most preferable to use a thermoplastic film having a relatively high heat resistance, for example, a polyethylene terephthalate film. Besides,
Other various synthetic resin films can be used depending on the use conditions.

The surface of the image-receiving sheet of the present invention is formed mainly of a material capable of receiving and holding the dye transferred from the ink sheet. In the sheet for dye thermal transfer printer, the image receiving layer is a dyeing layer, and a resin having good dyeability to a thermal transfer dye such as a sublimable disperse dye is used as a main component. Conventionally, as a dyeing layer resin having both dyeing property, required mechanical strength, and required heat resistance, a thermoplastic resin such as polyester, vinyl chloride-vinyl acetate or other vinyl compound has been used. It was

In order to improve the performance of the image-receiving sheet to obtain a high-quality, high-sensitivity and high-density transfer image, the dye transfer rate and transfer amount of the dye are high, and the dye-staining layer has good storage stability. (Image receiving layer) is being studied. For example, as a dye-dyeable resin, JP-A-62-244696 discloses a polyester resin modified with a phenyl group-containing polyol.

As shown in FIG. 1, the image-receiving sheet for thermal transfer of the present invention is provided with an image-receiving layer 2 for receiving a dye of an ink ribbon and this image-receiving layer on one surface of a sheet-like substrate 1. And a back surface coating layer 3 provided on the surface opposite to the surface provided with the back surface. Further, in the thermal transfer image-receiving sheet of the present invention, an intermediate layer 4 may be provided between the sheet-shaped substrate 1 and the image-receiving layer 2 as shown in FIG.

The sheet-shaped substrate used in the present invention is 20
It preferably has a thickness of ˜300 μm. Thickness is 2
If it is less than 0 μm, its mechanical strength becomes insufficient,
In addition, the hardness of the image receiving sheet obtained therefrom and the repulsive force against the deformation become insufficient, which may cause a problem that curling of the image receiving sheet which occurs during printing cannot be sufficiently prevented. On the other hand, if it exceeds 300 μm, the thickness of the obtained image receiving sheet becomes excessive, which may cause the following inconveniences in use. That is, in a printer having a predetermined volume, there is a limit to the volume of the image receiving sheet that can be accommodated, and an increase in the thickness of the image receiving sheet naturally leads to a decrease in the number of image receiving sheets that can be accommodated in the printer. In order to accommodate a predetermined number of image receiving sheets, the volume of the printer must be increased, which makes it difficult to make the printer compact.

In the conventional image-receiving sheet, a polyester resin, a polycarbonate resin, a vinyl chloride copolymer, a cellulose derivative or the like is used for the image-receiving layer provided on the surface of the sheet-shaped substrate. However, in recent years, there has been a demand for higher print density and higher printing speed, and in order to meet these demands, higher sensitivity of the image receiving paper is required. In order to increase the sensitivity of the image receiving sheet, it is necessary to improve the heat insulating property of the image receiving paper and the dye dyeing property of the image receiving layer. In the present invention,
An intensive study was carried out on an image-receiving layer having a good dye-dyeability, and it was found that an image-receiving layer formed by using a polyurethane carbonate resin exhibits an extremely good dye-dyeability.

The polyurethane carbonate resin used in the present invention is obtained by reacting a polyisocyanate compound with the terminal hydroxyl group of a low molecular weight polycarbonate having a -0-CO.O- group at the terminal to increase the molecular weight thereof. is there.

In general, a polycarbonate resin containing an aromatic ring is used as the polycarbonate resin for the image receiving layer. Although a polycarbonate containing an aromatic cyclic group can be used in the present invention, the present inventors have found that an aliphatic polycarbonate resin containing no aromatic cyclic group is very effective in improving the color density of a printed image. It was As a reason for such effect expression, the molecular chain of the polycarbonate polymer is flexible because it does not contain an aromatic ring,
The molecular motion when heat is applied to this is more repellent than that of the conventionally known polycarbonate resin containing an aromatic cyclic group, and therefore the dye is easily dissolved in the resin, and therefore the color density of the printed image is It can be high.

The polyurethane carbonate resin used in the present invention is, for example, a polycondensation product of ω-amino alcohol and phosgene, or a polycondensation product of polyhydric alcohol, phosgene and isocyanate, which has a carbonate bond in the molecule and a urethane bond. It can be selected from polymer compounds having a bond.

Further, the present inventors have found that the urethane bond (-NH-CO.O-) formed by bonding the isocyanate group of the polyisocyanate compound to the terminal hydroxyl group of the polycarbonate molecule improves the stability of the image receiving layer. I think it is increasing. Generally, a hydrogen atom in a urethane bond in one molecule is hydrogen bonded to an oxygen atom in another urethane bond. However, the hydrogen atom and the oxygen atom in the urethane bond do not form a hydrogen bond in the same urethane bond due to the resonance structure of the urethane bond. Therefore, since the polymer molecules in the polyurethane carbonate resin are mutually connected by hydrogen bonds,
It is considered that the acceptable dye concentration is improved and the heat resistance is improved at the same time.

In the image-receiving sheet of the present invention, a polyurethane carbonate resin that firmly dyes a sublimation dye transferred from an ink ribbon, such as Nitporan 5199 (trademark), manufactured by Nippon Polyurethane Co., and other thermoplastic resins as main components, 1 to 10 μm, preferably 2 to 7
An image receiving layer having a thickness of μm is formed on the sheet-shaped substrate. If the image receiving layer is too thin, the density and sensitivity of the image may be reduced, or the gloss of the printed surface may be reduced. On the other hand, if it is too thick, the dye image receiving effect is saturated, which is not only uneconomical, but the strength of the image receiving layer may be lowered.

If necessary, a crosslinking agent for a polyurethane carbonate resin, a slip agent, a release agent, a pigment, etc. are added to the image-receiving layer in order to prevent fusion of the image-receiving layer and the ink ribbon due to heat during printing. It is usually done. As needed,
Other additives such as polydimethylsiloxane-based copolymer resin (trademark: SH-3746, manufactured by Toray Dow Corning Silicone Co., Ltd.) may be included.
Further, plasticizers, pigments, fluorescent dyes, dyes such as blue and violet, ultraviolet absorbers, antioxidants and the like can be added. These additives may be mixed and coated as a component of the layer, or may be coated as a separate coating layer on the image receiving layer.

In the image-receiving sheet of the present invention, a back coating layer may be formed on the surface of the sheet-shaped substrate opposite to the surface provided with the image-receiving layer. This back cover layer prevents running and static electricity of the image receiving sheet, prevents damage to the image receiving layer when the image receiving sheets are rubbed against each other, and further prevents block transfer (fusion) with the binder of the ink ribbon. , Is also effective for preventing the transfer of dye from the image receiving layer to the back side when the printed image receiving sheets are stacked.

The back coating layer preferably contains a release agent in order to prevent fusion with the ink ribbon and migration of the dye. As the release agent used in the back surface resin coating layer, as a silicone type, silicone resin, dimethyl silicone oil, dimethyl silicone rubber, organic modified silicone, etc., as a fluorine type, polytetrafluoroethylene, etc., as a phosphate ester type, Polyoxyalkylene, phosphate ester, etc., fatty acid ester type, ethylene glycol fatty acid ester, sorbitol fatty acid ester, polyoxyethylene fatty acid ester, etc., alcohol type, polyoxyalkylene glycol, glycols, and polyoxyethylene higher alcohol ether As an amide type, polyoxyethylene alkyleneamide, etc., as a metal soap type, calcium stearate, and sodium oleate, etc. Things oil, and the like natural waxes, as fatty acid, stearic acid, and acids such as oleic acid, as well as mineral oil, may be used liquid paraffin. The back surface coating layer contains an organic resin as a binder and for the runnability of the image receiving sheet and for preventing scratches on the image receiving surface. As the organic resin, acrylic resin, epoxy resin, polyester resin,
Phenol resin, alkyd resin, urethane resin, melamine resin, etc., and reaction cured products of these resins can be used. Among these, MFT of 50 ° C. or higher is used.
It is preferable to use one having a (minimum film forming temperature) or one having a Tg (secondary transition point) of 20 ° C. or higher.

The release agent and the organic resin contained in the back surface coating layer may be simply mechanically mixed, but it is more preferable to use a material in which both are chemically bonded, such as a modified silicone resin. More preferable. There are various methods for modifying the silicone resin. For example, the functional group (silanol group or alkoxy group) of the silicone resin is
In the presence of no catalyst or a catalyst such as an organic titanate,
It is possible to mix with an organic resin having an alcoholic hydroxyl group in the molecule, and heat the reaction mixture to cause a dehydration condensation reaction or dealcoholization condensation reaction to bond and modify. Examples of such modified silicone resin include silicone acrylic, silicone epoxy, silicone polyester, silicone alkyd, silicone phenol, silicone urethane, and silicone melamine.

Various conductive agents may be added to the back coating layer of the present invention for antistatic treatment. A cationic polymer is preferably used as such a conductive agent. As the cationic polymer, generally, polyethyleneimine, an acrylic polymer containing a cationic monomer as a copolymerization component, a cation-modified acrylamide polymer, and cationic starch can be used.

The compounding ratio of each component constituting the back surface coating layer is such that 100 parts by weight of the organic resin and 3 to 10 of the releasing agent are used.
It is preferably 0 parts by weight and 20 to 150 parts by weight of the conductive agent. If the release agent content is less than 3 parts by weight, a sufficient anti-fusion effect cannot be obtained, and the content is 1
If it exceeds 100 parts by weight, the effect may be saturated and it may be uneconomical. Further, if the content of the conductive agent is less than 20 parts by weight, a sufficient effect of preventing static electricity cannot be obtained, and if the content exceeds 150 parts by weight, the effect may be saturated and uneconomical.

The coating amount of the back surface coating layer is 0.3 to 1.5 g.
It is preferably in the range of / m ² . When the coating amount is less than 0.3 g / m ² , when the image receiving layer of the image receiving sheet and the back surface of another image receiving sheet superposed on the image receiving layer rub against each other, the image receiving layer may not be sufficiently prevented from being scratched. If it exceeds 1.5 g / m ² , the effect may be saturated and uneconomical.

In the image-receiving sheet of the present invention, if necessary,
For example, another layer can be provided as an intermediate layer between the sheet-shaped substrate and the image receiving layer as a cushion layer for preventing the image receiving layer from being charged and increasing the image density. This middle layer is
For example, it contains hollow particles and / or a substance containing quaternary ammonium ions, and its coating amount is 0.1 to 1
It is preferably 0 g / m ² .

For the image receiving layer and other coating layers of the sheet of the present invention, a coating solution containing the required components is applied using a coater such as a bar coater, a gravure coater, a comma coater, a blade coater, an air knife coater, a gate roll coater. It can be formed by coating and drying.

The above-mentioned intermediate layer has an effect of improving the adhesive strength between the receiving layer and the sheet-shaped substrate, an antistatic effect, a cushioning property, and a heat insulating property.

[0038]

EXAMPLES The present invention will be further described with reference to examples. In the examples, “parts” means “parts by weight of solid content” unless otherwise specified.
Means

Example 1 100 μm thick transparent polyethylene terephthalate (P
A multilayer structure film (trademark: YUPO FPG6) having a thickness of 60 μm, which is produced by biaxially stretching a polyolefin containing an inorganic pigment as a main component on the back surface of a substrate made of an ET film.
0, manufactured by Oji Yuka Synthetic Paper Co., Ltd.) was laminated by a dry lamination method using a polyester adhesive to prepare a sheet-shaped substrate. The dye-image-receiving layer forming coating material 1 having the following composition was coated on the surface of the sheet-shaped substrate on the side of the multilayer structure film layer at a solid content of 5 g / m ² by a die coating method and dried. To form an image receiving layer. or,
A coating material-2 for forming a back surface coating layer having the following composition on the back surface of the sheet-shaped substrate on the transparent PET film side is solid content 0.1 g /
A backside coating layer was formed by applying the coating solution at a ratio of m ² by a die coating method and drying it.

The paint-1 (the image-receiving layer) Component Parts by weight polyurethane carbonate resin (trademark: NIPPORAN 5199, manufactured by Nippon Polyurethane Co., Ltd.) 100 parts of a silicone resin (trademark: SH3746, manufactured by Toray Dow Corning Silicone Co., Ltd.) of 5 parts The mixture was dissolved in a mixed solvent of toluene: methyl ethyl ketone = 5: 1 to give a 15% solution.

The paint 2 (for the back coating layer) Component Parts by weight Acrylic silicone block copolymer: and the (TM Modiper FS700, NOF Corporation) was dissolved in denatured ethanol 100 parts of 10% solution. The thermal transfer image-receiving sheet was prepared as described above.

Example 2 An image receiving sheet for thermal transfer was prepared in the same manner as in Example 1.
However, a paint having the following composition on the surface of the sheet-shaped substrate
3 was applied and dried at a solid content of 5 g / m ² by a die coating method to form an image receiving layer. A backside coating layer was formed by coating the coating material-2 at a solid content of 0.1 g / m ² by a die coating method and drying it.

The coating 3 (the image-receiving layer for) Component Parts by weight Polyurethane carbonate resin (trademark: Nipporan 5230, manufactured by Nippon Polyurethane Co., Ltd.) 100 parts Silicone resin (Trademark: SH3746, Toray Dow Corning Silicone Co., Ltd.) 5 parts plasticizer Agent (dicyclohexyl phthalate, manufactured by Tokyo Kasei Co., Ltd.) 20 parts Isocyanate (trademark: Coronate L, manufactured by Nippon Polyurethane Industry Co., Ltd.) 5 parts Dissolved in a mixed solvent of toluene: methyl ethyl ketone = 5: 1 of the above mixture to give a 15% solution. did.

Comparative Example 1 An image receiving sheet for thermal transfer was prepared in the same manner as in Example 1.
However, the coating material 4 having the following composition on the surface of the sheet-shaped base material at a solid content of 5 g / m ² by a die coating method,
The image-receiving layer was formed by coating and drying. Further, on the back surface of the base material, the back surface coating layer and the paint-2 were added in a solid content of 0.1 g.
It was formed by coating and drying by a die coating method at a ratio of / m ² .

[0045] Paint -4 Component Parts by weight of acrylic acid ester copolymer (Trademark: Primal WL-81, Rohm and Haas Co., Ltd.) 100 parts Epoxy resin (Trademark: Epokoto DX-255, manufactured by Shell Chemical Co., Ltd.) 5 Parts Higher fatty acid ester (butyl stearate, manufactured by NOF CORPORATION) 3 parts Conducting agent (trademark: SAFTMER ST1000, manufactured by Mitsubishi Yuka Co., Ltd.) 50 parts This mixture was dissolved in denatured ethanol to give a 10% solution.

Comparative Example 2 An image receiving sheet for thermal transfer was prepared in the same manner as in Example 1.
However, paint 5 having the following composition on the surface of the base material should have a solid content of 5
An image receiving layer was formed by coating and drying at a rate of g / m ² by a die coating method. Further, a back coating layer was formed on the back surface of the substrate by coating and drying the above paint-2 at a solid content of 0.1 g / m ² by a die coating method.

The paint -5 Component Parts by weight Polyester resin (trademark: Byron 200, Toyobo Co., Ltd.) 100 parts Silicone resin (Trademark: SH3746, Toray Dow Corning Silicone Co., Ltd.) 5 parts Isocyanate (trademark Coronate L, Nippon Polyurethane Industry Co., Ltd.) 5 parts was made into a 10% aqueous solution.

[0048]Comparative Example 3 A paint having the following composition on the surface of the same substrate as in Example 1
6 to a solid content of 5 g / m ²To the die coating method
More coated and dried. Also, a back cover layer is provided on the back surface of the substrate.
To form, paint-2 of Example 1 was added to a solids content of 0.1.
g / m²By the die coating method at the ratio of
After drying, an image receiving sheet was prepared.

Paint-6 parts by weight Polycarbonate resin (trademark: Panlite L1225, manufactured by Teijin Chemicals Ltd.) 100 parts Silicone resin (trademark: SH3746, manufactured by Toray Dow Corning Silicone Co., Ltd.) 5 parts 10% carbon tetrachloride It was a solution.

Comparative Example 4 Coating 7 having the following composition on the surface of the same substrate as in Example 1
Was coated by a die coating method at a solid content of 5 g / m ² and dried. Further, in order to form a back surface coating layer on the back surface of the base material, the paint-2 was applied by a die coating method at a solid content of 0.1 g / m ² and dried to prepare an image receiving sheet.

The paint -7 Component Parts by weight polyurethane resin (trademark: Desmophen 800, Sumitomo Bayer Urethane Co., Ltd.) 100 parts of a silicone resin (trademark: SH3746, Toray Dow Corning Silicone Co., Ltd.) 5 parts of isocyanate (trademark: SUMIJULE L, manufactured by Sumitomo Bayer Urethane Co., Ltd.) 5 parts was used as a 10% toluene solution.

Test and Evaluation The image-receiving sheets of Examples 1, 2, 3 and Comparative Examples 1, 2, 3, 4 were commercial sublimation color video printers (trademark: V).
Y-P1, Hitachi, Ltd.), and the curl formation state and the color density of the image receiving surface on which the black solid was printed were measured using a Macbeth densitometer RD-914 (trademark). The results are shown in Table 1.

[0053]

[Table 1]

[0054]

The image-receiving sheet for thermal transfer of the present invention is a new image-receiving sheet capable of thermal transfer with good transfer density, sensitivity and the like, and greatly contributes to the industrial world.

[Brief description of drawings]

FIG. 1 is a cross-sectional explanatory view showing the configuration of an example of a thermal transfer image-receiving sheet of the present invention.

FIG. 2 is a cross-sectional explanatory view showing the configuration of another example of the thermal transfer image-receiving sheet of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Sheet-shaped base material 2 ... Image receiving layer 3 ... Back cover layer 4 ... Intermediate layer

Claims (2)

[Claims] 1. A thermal transfer comprising a film-like substrate and an image-receiving layer formed on at least one surface of the substrate and containing a polyurethane carbonate resin as a main component for receiving a thermal transfer sublimation dye image. Image receiving sheet. 2. The thermal transfer image-receiving sheet according to claim 1, further comprising a back coating layer formed on the opposite surface of the film-shaped substrate and containing a release agent and a binder resin.