JPH0771875B2 - Heat transfer sheet - Google Patents

Description

The present invention is used in combination with a thermal transfer sheet, has excellent dye-dyeability, and also has light resistance and weather resistance of a formed image, particularly light resistance. The present invention relates to a heat transfer sheet having excellent properties.

(Prior Art) A thermal transfer sheet having a dye layer containing a sublimable disperse dye is heated in spots by a thermal head or the like according to an image signal, and an image composed of the dye transferred to the surface of the resin-coated paper Attempts are made to form.

However, with the conventional heat-transferable sheet, the light resistance and weather resistance of the formed image are not sufficient, and it is possible that the sharpness of the image once formed may be lowered or discolored. this is,
It is considered that the dye transferred by the thermal head or the like exists in the vicinity of the surface of the receptive layer and is therefore easily affected by light and humidity.

(Problems to be Solved by the Invention) Accordingly, it is an object of the present invention to eliminate the above-mentioned drawbacks in the conventional art and improve the light resistance and weather resistance of an image formed by migration of a dye.

According to the research conducted by the present inventors, it was found that the light resistance and the weather resistance are remarkably improved by forming the receiving layer using the modified polyester resin containing a long-chain methylene group. I arrived.

In the present invention, the thermal transfer sheet, "used in combination with a thermal transfer sheet having a dye layer containing a dye that melts or sublimes to migrate by heat,
A thermal transfer sheet having a receiving layer for receiving a dye that migrates from the thermal transfer sheet on the surface of a sheet-shaped substrate, wherein the receiving layer was synthesized by using a long-chain dicarboxylic acid as a dicarboxylic acid component. By including a modified polyester resin ”, it is possible to eliminate the above-mentioned drawbacks in the conventional technique.

The heat-transferable sheet 1 according to the present invention is, for example, a sheet-shaped device 2
Has a receiving layer 3 on top of it, and optionally has an intermediate layer 4 between the sheet-shaped substrate 2 and the receiving layer 3. The receiving layer 3 may be provided on one surface of the sheet-shaped substrate 2.

(Sheet-shaped substrate) As the sheet-shaped base 2, synthetic paper (polyolefin-based, polystyrene-based, etc.), high-quality paper, art paper, coated paper, cast coated paper, wallpaper backing paper, synthetic resin or emulsion-impregnated paper, synthetic Rubber latex impregnated paper, synthetic resin internal paper, paperboard, or natural fiber paper such as cellulose fiber paper, polyolefin, polyvinyl chloride, polyethylene terephthalate, polystyrene, methacrylate,
Various plastic films or sheets such as polycarbonate can be used. Of these, the synthetic paper
The surface has low thermal conductivity (in other words, high heat insulation)
It is preferable because it has a microvoid layer. Also, a laminate having any combination of the above items 1 to 3 can be used.
Examples of typical laminates include a laminate of cellulose fiber paper and synthetic paper, or a laminate of cellulose fiber paper and plastic film or sheet. Among them, the laminated body of the cellulose fiber paper and the synthetic paper has a high printing heat sensitivity due to the low thermal conductivity of the synthetic paper, which does not compensate for the thermal instability (expansion and contraction) of the synthetic paper. You may be able to demonstrate its strength. Further, in this combination, in order to balance the front and back of the laminated body, it is preferable to use a three-layered laminated body of synthetic paper, cellulose fiber paper and synthetic paper, and curling due to printing can be reduced.

As the synthetic paper used for the above-mentioned laminated body, generally, any one can be used as long as it can be used as a base material of a heat transferable sheet, but in particular, a synthetic paper provided with a paper-like layer having fine pores ( For example, commercially available synthetic paper: YUPO: made by Oji Yuka Synthetic Paper) is preferable. The fine pores in the paper-like layer can be formed, for example, by stretching a synthetic resin in a state of containing a fine filler. When an image is formed by thermal transfer using a thermal transfer sheet formed of a synthetic paper provided with a paper-like layer containing fine pores, there is an effect that the image density is high and the image does not fluctuate. It is considered that the fine pores have a heat insulating effect, the heat energy efficiency is good, and the good cushioning property of the fine pores contributes to the receiving layer on which the image is formed provided on the synthetic paper. Be done. It is also possible to directly provide the paper-like layer containing the fine pores on the surface of the core material such as cellulose fiber paper.

A plastic film may be used in addition to the cellulose fiber paper in the laminate, and a laminate of the cellulose fiber paper and the plastic film may also be used.

Examples of the method for sticking the synthetic paper and the cellulose fiber paper include, for example, sticking using a conventionally known adhesive, sticking using an extrusion laminating method, and sticking by heat bonding. As a method of sticking with a plastic film, a laminating method that also serves to form a plastic film,
Adhesion by a calendar method or the like can be mentioned. The attaching means is appropriately washed depending on the material to be attached to the synthetic paper. Specific examples of the adhesive include ethylene-vinyl acetate copolymer, emulsion adhesive such as polyvinyl acetate,
Examples include water-soluble adhesives such as polyesters containing a carboxyl group, and adhesives for lamination include polyurethane-based and acrylic-based organic solvent solutions such as polyurethane-based and acrylic-based organic solvent solution types. Adhesives.

(Receiving Layer) The material forming the receiving layer 3 receives (image-receiving) an image of a dye that migrates from the thermal transfer sheet, for example, a sublimable disperse dye.
And is a layer for maintaining the image formed by receiving.

In the present invention, the receiving layer 3 is composed of a modified polyester resin containing a long-chain methylene group.

The modified polyester resin preferably has a molecular weight of 10,000 to 30,000 and a degree of polymerization of about 100 to 200.

When the modified polyester resin has a long-chain methylene group, the reason for improving the pore resistance of the dyed dye is that the number of ester bonds in the polymer is relatively decreased. It is considered that the probability that slipping oxygen is generated at the site is reduced and photodegradation in the presence of oxygen or water that causes deterioration of the dye is less likely to occur. In this sense, the methylene group of dicarboxylic acid (below) HOOC (CH ₂ ) _n COOH (I) is preferably n ≧ 6, and the upper limit is n ≦ 30. It is desirable that such a long-chain dicarboxylic acid accounts for 20 to 100 mol% in the acid component.

Although it has already been described that the heat resistance transfer sheet of the present invention has good light resistance, it is particularly preferable to use a sublimable anthraquinone type dye as a dye constituting the heat transfer sheet.

As sublimable anthraquinone dyes, Solvent Blue 63, 59, 36, 14 and 74, Solvent Violet 14, 11 and Disperse Red 60, 3 and Disperse Violet 26, Disperse Blue 26 and 40 When these dyes are used in combination with the modified polyester resin, they have good light resistance and hardly fade under the third-class irradiation.

The modified polyester resin is thus synthesized using a modified acid component as shown below.

Modified acid component HOOC (CH ₂ ) _n COOH In the formula, n is 6 ≦ n ≦ 30.

Alternatively, as the dicarboxylic acid component, those of the formula (I) having a methylene group of n <6 may be used in combination.

In addition, each component at the time of synthesis need not be a single type, but may be appropriately combined with a plurality of types.

The modified polyester resin can also be used in combination with other resins to form the receiving layer.

For example, the following synthetic resins (a) to (e) can be used alone or as a mixture of two or more kinds.

(A) Those having an ester bond.

Polyester resin (other than phenyl modified). Polyacrylic ester resin, polycarbonate resin, polyvinyl acetate resin, styrene acrylate resin, vinyl toluene acrylate resin.

(B) having a urethane bond.

Polyurethane resin etc.

(C) A compound having an amide bond.

Polyamide resin (nylon).

(D) A compound having a urea bond.

Urea resin etc.

(E) A compound having a highly polar bond.

Polycaprolactone resin, polystyrene resin, polyvinyl chloride resin, polyacrylonitrile resin, etc.

For example, the receiving layer 3 is made of a mixed resin of a modified polyester and a normal polyester resin (not a phenyl modified resin). Examples of saturated polyester include Babylon
200, Byron 290, Byron 600, etc. (all manufactured by Toyobo), KA-1038C (manufactured by Arakawa Chemical Co., Ltd.), TP220, TP235 (all manufactured by Nippon Gosei), etc. are used.

Alternatively, the receiving layer is composed of a modified polyester resin and a vinyl chloride resin / vinyl acetate copolymer resin. Vinyl chloride / vinyl acetate copolymer resin has a vinyl chloride content
It is preferably 85 to 97% by weight and the degree of polymerization is about 200 to 800. The vinyl chloride / vinyl acetate copolymer resin is not limited to a copolymer containing only a vinyl chloride component and a vinyl acetate copolymer component, and may be a vinyl alcohol component, a maleic acid component or the like.

The receiving layer 3 may also be composed of a mixed resin of a modified polyester resin and a polystyrene resin, for example, a homopolymer or a copolymer of styrene monomers such as styrene, α-methylstyrene and vinyltoluene. Polystyrene resin or a styrene copolymer which is a copolymer of the styrene monomer and another monomer, for example, an acrylic or methacrylic monomer such as acrylic acid ester, methacrylic acid ester, acrylonitrile, methacrylonitrile, or maleic anhydride. Polymer resins may be mentioned.

When using the modified polyester resin and other resins together,
Depending on the degree of phenyl modification of the modified polyester resin, it is preferable that the amount of the other resin is 0 to 100 parts by weight with respect to 100 parts by weight of the modified polyester resin. In other words, when used in combination as described above, the modified polyester resin may account for 50 to 100 g in the total resin weight of 100 g. In any of the above aspects, the object is to further improve the sharpness of the point difference image even if the whiteness of the receiving layer 3 is improved, impart writability to the surface of the heat-transferred sheet, and prevent retransfer of the transferred image. Then, a white pigment can be added to the receiving layer 3. As the white pigment, titanium oxide, zinc oxide, kaolin, clay, calcium carbonate fine powder silica and the like are used, and as described above, a mixture of two or more thereof can be used. Further, in order to further enhance the light resistance of the transferred image, one or more kinds of additives such as an ultraviolet absorber, a light stabilizer, an antioxidant and the like can be added to the image receiving layer, if necessary. The amounts of these ultraviolet absorbers and light stabilizers added are preferably 0.05 to 10 parts by weight and 0.5 to 3 parts by weight with respect to 100 parts by weight of the resin constituting the receiving layer 3.

The heat-transferable sheet of the present invention may contain a releasing agent in the receiving layer in order to improve the releasability from the thermal transfer sheet. Solid waxes such as polyethylene wax, amide wax, and Teflon powder as release agents;
Fluorine-based and phosphoric acid-ester-based surfactants; silicone oil and the like can be mentioned, but silin corn oil is preferable.

As the silicone oil, oily ones can be used, but curable ones are preferable. Examples of the curable silicone oil include a reaction curable type, a photocurable type and a catalyst curable type, and a reaction curable type silicone oil is particularly preferable. As a reaction-curable silicone oil,
It is preferable that the amino-modified silicone oil and the epoxy-modified silicone oil are reacted and cured, and examples of the amino-modified silicone oil include KF-393, KF-847, and KF-85.
8, X-22-3680, X-22-3801C (above, manufactured by Shin-Etsu Chemical Co., Ltd.) and the like, and epoxy-modified silicone oils include KF-100T, KF-101, KF-60-164, and KF103.
(Above, manufactured by Shin-Etsu Chemical Co., Ltd.) and the like. Also, as a catalyst-curable or photocurable silicone oil
KS-705F, KS-770 (catalyst-curable silicone oil: Shin-Etsu Chemical Co., Ltd.), KS-720, KS-774 (photo-curable silicone oil: Shin-Etsu Chemical Co., Ltd.)
Manufactured) and the like. The addition amount of these curable silicone oils is preferably 0.5 to 30% by weight of the resin constituting the image receiving layer. Further, a part of the surface of the receiving layer may be provided with a release agent by dissolving or dispersing the release agent in an appropriate solvent and applying the solution, followed by drying. As the release agent constituting the release agent, a reaction cured product of the amino-modified silicone oil and the epoxy-modified silicone oil described above is particularly preferable. The thickness of the release agent layer is 0.01 to 5 μm, and especially 0.1.
05 to 2 μm is preferable.

If silicone oil is added to form the receptive layer, the release agent layer can be formed even if the silicone oil bleeds on the surface after application and then cured.

The above white pigments, ultraviolet absorbers, light stabilizers, antioxidants, and release agents can be applied so as to be contained in the receiving layer on one surface or both surfaces, if necessary.

The receiving layer 3 is formed by a known coating or printing method using a receiving layer-forming composition obtained by dissolving or dispersing a material for forming the receiving layer on the sheet-shaped substrate 2. Alternatively, it may be carried out by a method in which it is once formed on a temporary carrier different from the sheet-shaped substrate 2 and then transferred onto the sheet-shaped substrate 2 again.

A sheet having a releasable surface is used as the temporary carrier. For example, those subjected to a release silicone layer after applying an undercoat layer to the surface of cellulose fiber paper or synthetic paper, those obtained by extrusion coating a polyolefin resin or polyester resin on the surface of cellulose fiber paper, or For example, a plastic film such as a polyester film provided with a release silicone layer on the surface thereof.

A receiving layer is formed on the temporary carrier in the same manner as on the sheet-shaped substrate 2, and then an adhesive layer is formed, if necessary. This adhesive layer is for ensuring the adhesive force between the sheet-shaped substrate 2 and the receiving layer 3 when the image-receiving layer is transferred onto the sheet-shaped substrate 2. In this method, another layer, for example, an intermediate layer for imparting cushioning properties is formed on a temporary carrier, and the intermediate layer and the receiving layer are transferred onto the sheet-shaped substrate 2 at a time. Good. When the intermediate layer also serves as an adhesive, the adhesive layer need not be formed on the temporary carrier. In any case, since the adhesive layer may be interposed between the sheet-shaped base material and the uppermost layer on the temporary carrier, the adhesive layer is formed on the sheet-shaped base material 2 in advance. Alternatively, only the receiving layer or the receiving layer and the intermediate layer may be sequentially formed on the temporary carrier and transferred.

When the method of forming the receiving layer 3 on the temporary carrier and then forming it on the sheet-shaped substrate 2 by the transfer method is adopted, the surface of the receiving layer formed on the sheet-shaped substrate 2 is temporarily changed. Since the surface state of the carrier is transferred, the smoothness is very excellent, and the receiving layer formed directly on the sheet-shaped substrate 2 is inferior in smoothness as compared with the transfer method. To obtain a clearer and more detailed image, it is better to adopt the transfer method.

Any adhesive can be used as long as it can bond the receiving layer and the substrate, and polyester-based, polyacrylic ester-based,
Polyurethane-based, polyvinyl chloride-based, polyolefin-based, ethylene-vinyl acetate copolymer, synthetic rubber-based organic solvent solutions or emulsions can be used. The adhesive may be a heat adhesive type or a room temperature adhesive type. In the case of the heat-bonding type, heat-bonding with a hot-melt type adhesive such as wax, ethylene / vinyl acetate copolymer resin, polyolefin and petroleum resin, or sandwich lamination using an extrusion film such as a polyolefin film may be used.

A double-sided tape may be used as an adhesive that also serves as an intermediate layer. The double-sided tape is a rayon paper impregnated with an acrylic adhesive and dried, and the double-sided tape after drying has fine pores and is considered to play a role equivalent to a foam layer.

(Intermediate Layer) The intermediate layer 4 is either a cushioning layer or a porous layer depending on the constituent material, or may also serve as an adhesive in some cases.

The cushioning layer is mainly composed of a resin having a 100% modulus defined by JIS-K-6301 of 100 Kg / cm ² or less. Here, when the 100% modulus exceeds 100 Kg / cm ² , the rigidity is increased. Since it is too high, even if an intermediate layer is formed using such a resin, sufficient adhesion between the thermal transfer sheet and the thermal transfer layer during printing cannot be maintained. Also, the lower limit of the 100% modulus is practically about 0.5 Kg / cm ² .

Examples of resins that meet the above conditions include the following.

Polyurethane resin Polyester resin Polybutadiene resin Polyacrylic ester resin Epoxy resin Polyamide resin Rosin-modified phenol resin Terpene phenol resin Ethylene / vinyl acetate copolymer resin The above resins can be used alone or in combination of two or more. , The above resins are relatively sticky, so if there are any problems during processing, inorganic additives,
For example, silica, alumina, clay, calcium carbonate, or an amide-based substance such as stearic acid amide may be added.

The cushioning layer can be formed by kneading a resin as described above with a solvent, a diluent and the like together with other additives as necessary to form a paint or ink, and drying the film as a coating film by a known coating method or printing method. , Its thickness is 0.
The thickness is 5 to 50 μm, more preferably 2 to 20 μm. If the thickness is 0.5 μm, it cannot absorb the roughness of the surface of the sheet-like base material provided, and therefore it is not effective. Projecting, hindering winding or stacking, and not economical.

It is considered that the formation of such an intermediate layer improves the adhesion between the thermal transfer sheet and the thermal transfer sheet, because the intermediate layer is deformed due to the pressure at the time of printing due to its low rigidity. Such a resin usually has a low glass transition point and a softening point, and it is presumed that it contributes to the fact that the thermal energy applied during printing further lowers the rigidity and makes it easier to deform than at room temperature. .

The porous layer 3 is a synthetic resin emulsion such as polyurethane, a synthetic rubber latex such as methylmethacrylate-butadiene system, and a layer obtained by applying a liquid bubbled by mechanical agitation onto the base material 2 and drying it, the above synthetic resin emulsion, the above synthesis. The base material 2 is a liquid in which a foaming material is mixed with rubber latex.
A layer which is applied and dried on the base 2, a synthetic resin such as vinyl chloride plastisol or polyurethane, or a synthetic rubber such as styrene-butadiene based, and a liquid in which a foaming agent is mixed is applied onto the base 2 and heated to foam. , A solution of a heat-phobic resin or synthetic rubber dissolved in an organic solvent is less likely to evaporate than a harmful organic solvent, has compatibility with the organic solvent, and has solubility with respect to the heat-plastic resin or synthetic rubber. A non-solvent (including one containing water as a main component) and a mixed solution are applied onto the base material 2 and dried to form a microagglomerated film, thereby forming a microporous phase or the like. the above~
Since the layer of No. 3 has large bubbles, the receiving layer 3 is formed on the layer.
When the forming solution is applied and dried, the surface of the receiving layer 3 formed by drying may be uneven. Therefore, in order to obtain the surface of the receiving layer 3 which has a small unevenness and is capable of transferring a highly uniform image, it is preferable to provide the microporous layer as the porous layer.

The thermoplastic resin used in forming the microporous layer, saturated polyester, polyurethane,
Examples thereof include vinyl chloride / vinyl acetate copolymers and cellulose acetate propionate. Examples of the synthetic rubbers used in the same manner include styrene-butadiene type, isoprene type and urethane type. Various organic solvents and non-solvents can be used in forming the microporous layer, but usually, a hydrophilic solvent such as methyl ethyl ketone and alcohol is used as the organic solvent, and a non-solvent is also used. Water is used.

The thickness of the porous layer in the present invention is preferably 3 μm or more, and particularly preferably 5 to 20 μm. If the thickness of the porous layer is less than 3 μm, the effects of cushioning property and heat insulating property are not exhibited.

Although the description has been mixed up, the intermediate layer may also serve as an adhesive as described in the description of the method for forming the receiving layer.

The above-mentioned intermediate layer may be provided on both sides of the non-thermal transfer sheet when the receiving layer is on both sides, or may be provided on only one side.

An antistatic material may be contained in at least one of the receiving layers or on the surface of the receiving layer in order to suppress generation of static electricity during the processing step of the non-thermal transfer sheet or during running in the printer. As the antistatic material, a surfactant such as a cationic surfactant (eg, quaternary ammonium salt, polyamine derivative, etc.), an anionic surfactant (eg, alkyl phosphate, etc.), a zwitterionic surfactant or a nonionic surfactant. Type surfactants.

The antistatic agent may be applied and formed on the surface of the receiving layer by gravure coating, bar coating, or the like, or may be kneaded into the resin for the receiving layer and transferred to the surface of the receiving layer during coating and drying of the receiving layer. A cationic acrylic polymer can also be used as the antistatic agent mixed with the receptor layer resin.

(Operation / Effect of Invention) The non-thermal transfer sheet of the present invention has a receptive layer formed by using a modified polyester resin synthesized using a phenyl group-containing polyol and a long-chain dicarboxylic acid. The image formed by printing with a thermal head etc. in combination with Satoto has a high density due to the polyol component, and due to the dicarboxylic acid component, the color bleeds or blurs even after long-term storage and the sharpness decreases. And there is no inconvenience such as discoloration.

(Example) In the following examples and comparative examples, production of a thermal transfer sheet and a thermal transfer sheet, printing using both sheets, and a test of the thermal transfer sheet were conducted as follows.

Thermal transfer sheet A 6 μm thick polyethylene terephthalate film (Toyobo: S-PET) with corona discharge treatment on one side is used as a base material, and a thermal transfer layer with the following composition is formed on the surface of the base material subjected to corona discharge treatment. The coating composition is applied by wire bar coating to a dry thickness of 1 μm to form a thermal transfer layer, and a silicone oil (X-41-4003
After dropping 2 drops of A: Shin-Etsu Silicone) with a dropper,
After spreading the whole surface to form an active layer, the whole surface was spread to form a slipping layer to obtain a thermal transfer sheet.

Composition for forming thermal transfer layer Disperse dye: 4 parts by weight (Nippon Kayaku: Kayaset Blue 714) Ethyl hydroxycellulose: 5 parts by weight (Hercules) Toluene: 40 parts by weight Methyl ethyl ketone: 40 parts by weight Dioxane ...... 10 parts by weight Thermal transfer sheet A synthetic paper with a thickness of 150 μm (Oji Yuka Kabushiki Kaisha: YUPO FPG-150) is used as a base material, and the receiving layer forming composition of the following composition is dried on this surface by wire bar coating. To be 4 μm, and then provisionally dried by a dryer and then dried in an oven at 100 ° C. for 30 minutes to form a receptor layer, which was used as a heat-transferable sheet.

Receptor layer-forming composition Resin: 14 parts by weight Amino-modified silicone oil: 1 part by weight (Shin-Etsu Chemical: KS-396) Epoxy-modified silicone oil: 1 part by weight (Shin-Etsu Chemical: X-22 -343) Torue ...... 42 parts by weight Methyl ethyl ketone ...... 42 parts by weight The thermal transfer sheet and the thermal transfer sheet are superposed so that the thermal transfer layer and the receiving layer are in contact with each other, and the thermal head is applied from the substrate side of the thermal transfer sheet by the thermal head. Output 1W /
Dots, pulse width 0.3 to 0.45 m / sec, dot density 3 dots
When the cyan disperse dye in the thermal transfer layer of the thermal transfer sheet was transferred to the receiving layer of the thermal transfer sheet by heating at a temperature of / mm, a clear cyan image was formed.

Example Each of the following components, and as a catalyst, a trace amount of calcium acetate and antimony trioxide were put into a Kreisen flask type reactor equipped with an air cooler, and the temperature was gradually raised in N ₂ atmosphere, The temperature was maintained at 150 ° C, the reaction was carried out by stirring at this temperature for 1 hour, and then the reaction product was placed in a Pyrex tube equipped with a thermocouple to completely block O ₂ , and 275 ° C, 0.1
Polycondensation reaction was carried out for 2 hours under conditions of .about.0.05 mmHg to obtain a phenyl modified polyester resin.

Example 1 Acid component terephthalic acid ...... 40 parts by weight Isophthalic acid ...... 40 parts by weight Nonanedicarboxylic acid ...... 20 parts by weight Polyol component ethylene glycol ...... 50 parts by weight Bisphenol A ...... 50 parts by weight Example 2 Acid component terephthalic acid ...... 40 parts by weight Isophthalic acid …… 40 parts by weight Dodecanedicarboxylic acid …… 20 parts by weight Polyol component ethylene glycol …… 50 parts by weight Neopentyl glycol …… 50 parts by weight Example 3 The modified polyester obtained in Example 1 A polystyrene resin (Picolastic D125, manufactured by Rika Hercules) was mixed at a weight ratio of 1: 1 and used.

Comparative Example 1 Acid component terephthalic acid ...... 50 parts by weight Isophthalic acid ...... 50 parts by weight Polyol component ethylene glycol ...... 50 parts by weight Neopentyl glycol ...... 50 parts by weight A heat transferable sheet using the resin obtained above is formed. Then, when printed, all of the products of Examples 1 to 3 were excellent in light resistance and hardly browned, but the products of Comparative Examples were markedly browned after the third-class irradiation.

[Brief description of drawings]

1 and 2 are cross-sectional views of the heat transfer sheet of the present invention. 1 ... Thermal transfer sheet 2 ... Sheet-like substrate 3 ... Receiving layer 4 ... Intermediate layer

Claims (2)

[Claims] 1. A receptive layer which is used in combination with a thermal transfer sheet having a dye layer containing a dye which is melted or sublimated by heat to transfer a dye which migrates from the thermal transfer sheet to the surface of a sheet-shaped substrate. A heat transferable sheet having the above, wherein the receiving layer contains a modified polyester resin synthesized using a long-chain dicarboxylic acid as a dicarboxylic acid component. 2. The heat transferable sheet according to claim 1, wherein the receptive layer contains a blended resin of a modified polyester resin and another resin.