JP3357403B2 - Thermal transfer image receiving sheet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermal transfer image-receiving sheet, and more particularly to a thermal transfer image-receiving sheet capable of forming a recorded image excellent in durability such as color density, sharpness and various fastnesses, especially fingerprint resistance and plasticizer properties. An object of the present invention is to provide a heat transfer image receiving sheet that can be used.

[0002]

2. Description of the Related Art Conventionally, various thermal transfer methods are known. Among them, a sublimable dye is used as a recording agent, and this is carried on a base sheet such as a polyester film to form a thermal transfer sheet. Dyeable thermal transfer image receiving sheet,
For example, a method has been proposed in which various full-color images are formed on a thermal transfer image receiving sheet having a dye receiving layer formed on paper, plastic film, or the like. In this case, a thermal head of a printer is used as a heating means, and a large number of color dots of three or four colors are transferred to a thermal transfer image receiving sheet by heating for a very short time, and a full-color image of an original is formed by the multicolored dots. Is to reproduce.

[0003] The image formed in this way is very clear because the coloring material used is a dye, and is excellent in transparency, so that the obtained image has poor reproducibility and gradation of intermediate colors. It is excellent, is similar to an image by conventional offset printing or gravure printing, and can form a high-quality image comparable to a full-color photographic image.

[0004]

In order to effectively carry out the above-described thermal transfer method, not only the structure of the thermal transfer sheet but also the structure of the thermal transfer image receiving sheet for forming an image is important. As a prior art of the thermal transfer image receiving sheet, for example, Japanese Patent Application Laid-Open No. 57-169370 and 57-2
Nos. 07250 and 60-25793 and the like, polyester resins, vinyl resins such as polyvinyl chloride resins, polycarbonate resins, polyvinyl butyral resins, acrylic resins, cellulose resins, olefin resins, polystyrene resins, etc. There is disclosed a technique for forming a dye receiving layer using the above.

[0005] The dye-receiving layer of the thermal transfer image-receiving sheet as described above is usually prepared by dissolving the resin as described above in a highly volatile organic solvent, for example, a general-purpose organic solvent such as toluene, methyl ethyl ketone, or ethyl acetate, to prepare a coating solution. It is prepared by applying it to a substrate sheet surface and drying it. In this case, drying is easy because the solvent is volatile,
Since the resin forming the dye-receiving layer is essentially lipophilic, the dye-dyeing layer has good dyeability and a high-density and clear image is formed. When touched, the image discolors due to the influence of sweat or sebum transferred to the image surface, and the dye receiving layer itself swells and cracks, that is, the problem of fingerprint resistance, the eraser, and the soft vinyl chloride resin Problems such as migration of the dye upon contact with a substance containing a plasticizer, such as a product, that is, resistance to a plasticizer, etc. have occurred. Therefore, an object of the present invention is to provide a clear image having a sufficient density in a thermal transfer method using a sublimable dye, and furthermore, the formed image has excellent various fastnesses, particularly excellent fingerprint resistance and plasticizer resistance. An object of the present invention is to provide a thermal transfer image receiving sheet exhibiting properties and the like.

[0006]

The above object is achieved by the present invention described below. That is, the present invention provides a thermal transfer image-receiving sheet having a dye-receiving layer formed on at least one surface of a base sheet, wherein the dye-receiving layer is a mixture of an aqueous dispersion of a polyester resin and an aqueous dispersion of a polycarbonate resin. Alternatively, in a thermal transfer image-receiving sheet formed from a coating liquid comprising an aqueous dispersion of a mixture of both resins, the polyester resin has a solubility in methyl ethyl ketone, toluene, ethyl acetate, chloroform or ethanol of 25.
5% by weight or less at 0 ° C., and the polycarbonate resin has structural units represented by the following general formulas (1) and (2), and is represented by the general formulas (1) and (2) A thermal transfer image-receiving sheet, which is a random copolycarbonate resin having a structural unit molar ratio of 30/70 to 70/30.

Embedded image (Wherein R _{1 to} R ₈ represent a hydrogen atom, a halogen atom or an alkyl group having 1 to 4 carbon atoms, and A represents a linear, branched or cyclic alkylidene group having 1 to 10 carbon atoms, an aryl-substituted alkylidene group) A group, an aryl group or a sulfonyl group;
Represents an oxygen atom or a sulfur atom)

[0007]

The dye receiving layer is formed using a dispersion of a polyester resin and a polycarbonate resin which are essentially insoluble in a general-purpose solvent and dispersed in water. Durability such as agent properties is improved. In another preferred embodiment of the present invention, a polyester resin is used as the dye-receiving resin, and a small amount of a sulfonic acid group or a salt thereof is introduced into the polyester resin so that the polyester resin can be easily added to an aqueous medium. By imparting hydrophilicity that is dispersed in, and by using a resin having good dye-dyeing properties, without using a general-purpose solvent, to give a clear image with sufficient density, and of the image to be formed A thermal transfer image-receiving sheet with improved durability such as fingerprint resistance and plasticizer resistance can be provided.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Next, the present invention will be described in more detail with reference to preferred embodiments. The thermal transfer image receiving sheet of the present invention comprises a base sheet and a dye receiving layer provided on at least one surface thereof. As the base sheet used in the present invention, synthetic paper (polyolefin-based, polystyrene-based, etc.),
Fine 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, etc., cellulose fiber paper, polyolefin, polyvinyl chloride, Various plastic films or sheets such as polyethylene terephthalate, polystyrene, polymethacrylate, and polycarbonate can be used, and a white opaque film formed by adding a white pigment or filler to these synthetic resins or a foamed foam sheet Etc. can also be used and are not particularly limited.

Further, a laminate obtained by arbitrarily combining the above-mentioned base sheets can also be used. Examples of typical laminates include synthetic paper of cellulose fiber paper and synthetic paper or cellulose fiber paper and plastic film or sheet. The thickness of these substrate sheets may be arbitrary, for example, 10 to
A thickness of about 300 μm is common. When the substrate sheet as described above has poor adhesion to the dye-receiving layer formed on its surface, it is preferable to apply a primer treatment or a corona discharge treatment to its surface. The dye receiving layer formed on the surface of the base sheet receives the sublimable dye transferred from the thermal transfer sheet and maintains the formed image. In the present invention, the main component of the resin for forming the dye receiving layer is a polyester resin which is easily dispersed in an aqueous medium (which may contain an organic solvent).

As a method for easily dispersing a polyester resin in an aqueous medium, for example, Japanese Patent Publication No. Sho 61-5809
The polyester resin used in the present invention may be prepared from methyl ethyl ketone, toluene, ethyl acetate, chloroform, ethanol, or the like from the viewpoint of improving fingerprint resistance and plasticizer resistance of an image. It is preferable that the resin is insoluble to hardly soluble in general-purpose organic solvents. As a method for making the polyester resin insoluble to hardly soluble in such a general-purpose solvent, it is preferable to appropriately select and use raw materials when synthesizing the polyester.

The acid component of the polyester resin used in the present invention includes, for example, aromatic compounds such as terephthalic acid,
Isophthalic acid, orthophthalic acid, 2,6-naphthalenedicarboxylic acid and the like, and examples of the aliphatic or alicyclic dicarboxylic acid include, for example, succinic acid, adipic acid, azelaic acid, sebacic acid, dodecandioic acid, dimer acid, Examples thereof include tetrahydrophthalic acid, hexahydrophthalic acid, hexahydroisophthalic acid, and hexahydroterephthalic acid. Furthermore, p-hydroxybenzoic acid, p-
(2-Hydroxyethoxy) benzoic acid, hydroxypivalic acid, γ-butyrolactone, ε-caprolactone and the like can be used in combination as needed. If necessary, a polycarboxylic acid having three or more functions such as trimellitic acid and pyromellitic acid can be used as long as it is 10 mol% or less based on all carboxylic acid components.

In the present invention, in order to make the obtained polyester resin insoluble or hardly soluble in general-purpose organic solvents and to make it dispersible in water, particularly, a part of the aromatic dicarboxylic acid among the above-mentioned acid components is converted into sulfonic acid or its sulfonic acid. The salt-substituted acid component is preferably used in an amount of 0.5 to 10 mol%, more preferably 1.0 to 6 mol% of the entire acid component. When the amount is less than 0.5 mol%, the water dispersibility of the formed resin for forming a dye receiving layer may be reduced. Preferred aromatic dicarboxylic acids containing these sulfonic acid substitutions (or salt groups thereof) include sulfoterephthalic acid, 5-sulfoisophthalic acid, 4-sulfophthalic acid, 4-sulfonaphthalene-2,7-dicarboxylic acid, 5
(4-sulfophenoxy) isophthalic acid and salts thereof such as lithium, potassium, magnesium, calcium, copper, iron and the like. Particularly preferred is 5-sodium sulfoisophthalic acid.

The polyol component, which is another raw material of the polyester used in the present invention, includes ethylene glycol,
1,2-propylene glycol, 1,3-propanediol, 1,4-butanediol, neopentyl glycol, 1,5-pentanediol, 1,6-hexanediol, 1,4-cyclohexanedimimethanol and tricyclo Decane dimethanol (TCD-M) and the like. TCD-M is preferably used as all or a part of the diol component in order to improve the light fastness of an image formed on the dye receiving layer. Further, if necessary, a trifunctional or higher functional polyol such as trimethylolpropane, trimethylolethane, glycerin, pentaerythritol or the like may be used in an amount of 5% by weight or less based on all polyol components. In particular, polyethylene glycol having a molecular weight of 106 to 10,000 may be used if necessary in an amount of 5% by weight or less of the total polyol component. The method for producing the polyester comprising the above components may be a conventionally known method, and is not particularly limited. Further, the glass transition temperature of the obtained polyester can be controlled by using terephthalic acid and isophthalic acid. In the present invention, the glass transition temperature is preferably 50 to 120 ° C., and the molecular weight is 5,000.
The range from 0 to 40,000 is optimal.

In the present invention, in order to make the obtained polyester resin insoluble or hardly soluble in general-purpose organic solvents and to make it water-dispersible, 75 mol% to 90 mol% of all polyol components are used.
Preference is given to using mol% of ethylene glycol. In the present invention, “insoluble to hardly soluble” means that the solubility of the polyester resin in methyl ethyl ketone, toluene, ethyl acetate, chloroform or ethanol at 25 ° C. is 5% by weight or less. By making the polymer insoluble or hardly soluble in this general-purpose solvent, the dye image dyed on the dye receiving layer has good plasticizer resistance and fingerprint resistance. The above examples are preferred methods for making the polyester resin used in the present invention insoluble to hardly soluble in general-purpose organic solvents.However, by introducing a polyethylene oxide group or a carboxyl group into the other polyester resin, the polyester resin is made hydrophilic. May be used.

As a method for dispersing the polyester resin in an aqueous medium as described above, the polyester resin is previously dissolved in methanol, ethanol, propanol, butanol, ethylene glycol, propylene glycol, methyl cellosolve, ethyl cellosolve, butyl cellosolve, Methyl-3-methoxybutanol, n-butyl cellosolve acetate, dioxane, ethyl acetate, methyl ethyl ketone, cyclohexanone, cyclooctanone, cyclodecanone, isophorone, particularly preferably butyl cellosolve, ethyl cellosolve, dissolved in a solvent such as isopropanol at an appropriate concentration, and then The solution can be prepared by adding the solution to water with stirring at a temperature of 40 to 200 ° C. Alternatively, water may be added to the organic solvent solution with strong stirring.

In the present invention, when forming the dye-receiving layer, the dispersion liquid of the polyester resin may have a glass transition temperature of 50 ° C.
Polyester, polycarbonate, polyvinyl acetate, vinyl acetate / acrylic copolymer, polyacrylic ester, polyester having a glass transition temperature of −20 ° C. or higher, preferably −10 to 90 ° C. Glass transition temperature lower than the above polyester resins such as crosslinked polyacrylic acid ester, styrene / acrylic copolymer, polystyrene, ethylene / vinyl acetate copolymer, ethylene / vinyl acetate / acrylic terpolymer, and polyvinyl chloride By mixing and using the aqueous dispersion of the resin described above, it is possible to improve dye dyeing properties and image density without reducing fingerprint resistance and plasticizer resistance.

In the present invention, the resin used in combination with the polyester resin is a polycarbonate resin, and the polycarbonate resin is a polycarbonate resin having structural units represented by the following general formulas (1) and (2). .

Embedded image (Wherein R _{1 to} R ₈ represent a hydrogen atom, a halogen atom or an alkyl group having 1 to 4 carbon atoms, and A represents a linear, branched or cyclic alkylidene group having 1 to 10 carbon atoms, an aryl-substituted alkylidene group) A group, an aryl group or a sulfonyl group;
Represents an oxygen atom or a sulfur atom)

The polycarbonate resin is a random copolycarbonate resin in which the molar ratio of the structural units represented by the general formulas (1) and (2) is 30/70 to 70/30. The molecular weight of these polycarbonate resins is preferably in the range of 5,000 to 50,000. The combined ratio of the polyester resin (A) insoluble to hardly soluble in the solvent and the polycarbonate resin (B) is preferably A / B = 60/40 to 95/5 by weight. When the content of (B) is too large, the formed image density is improved, but the fingerprint resistance and the plasticizer resistance are reduced, and when the content of (B) is too small, the opposite result is obtained. Further, anionic or nonionic surfactants, polyvinyl alcohol, gelatin, modified polyvinyl alcohol for protective colloid, starch, celluloses and the like may be used in order to stabilize the dispersed particles of the aqueous dispersion of the resin. . Further, in order to control the glass transition temperature, a low molecular weight or high molecular weight plasticizer may be mixed and used.

As a method of dispersing the resins, a method of uniformly mixing (for example, melting and mixing) two kinds of resins in advance and dispersing them in an aqueous medium, and a method of dissolving the two kinds of resins in a common solvent and depositing and dispersing them in water. Any method can be used, such as a method in which resins are individually dispersed in an aqueous medium and a dispersion is mixed, but a preferred method is a method in which two resins are dissolved in a common solvent and precipitated and dispersed in water. According to this method, a polycarbonate resin, which was conventionally difficult to disperse in an aqueous medium, can be well dispersed in an aqueous medium together with a polyester resin.

In order to improve the light fastness of the formed image, a light stabilizer such as a benzotriazole-based or benzophenone-based ultraviolet absorber, an antioxidant such as a hindered amine or a hindered phenol is used in advance. It is preferable that the resin is contained in the resin for forming the dye receiving layer, or that the aqueous dispersion is mixed with and dissolved in a water-soluble ultraviolet absorber. Among the examples of the light stabilizer as described above, examples of the water-soluble one include those having the following structural formula.

[0021]

Embedded image

The thermal transfer image-receiving sheet of the present invention is provided on at least one surface of the base sheet with an aqueous dispersion mainly composed of a polyester resin and a polycarbonate resin as described above and other necessary additives such as a release agent. A coating liquid prepared by adding a mold agent, an ultrafine inorganic filler, a cross-linking agent, a curing agent, a catalyst, a thermal release agent, and the like to an aqueous dispersion by the method described above, for example, gravure printing, screen printing Coating and drying by a forming method such as a reverse roll coating method using a gravure plate or the like to form a dye receiving layer. Further, for the purpose of improving the coating strength of the dye-receiving layer, epoxy resin, polyisocyanate, aluminum, zinc, and so on as long as the object of the present invention is not hindered.
A cross-linking agent such as a chelating agent such as titanium or zirconium can be used as a mixture.

In the formation of the dye receiving layer, titanium oxide, zinc oxide, kaolin clay, calcium carbonate, fine powdered silica, etc. are used for the purpose of improving the whiteness of the dye receiving layer to further enhance the sharpness of the transferred image. Pigments and fillers can be added. The dye-receiving layer formed as described above may have any thickness, but generally has a thickness of 1 to 50 μm. Further, such a dye receiving layer may be formed into a continuous coating by heating the dispersion to a relatively high temperature after coating, or may be formed as a discontinuous coating by drying at a low temperature. On the surface of the dye receiving layer formed as described above, a water-dispersible or water-soluble modified silicone oil available from the market is used to improve the releasability from the dye layer of the thermal transfer sheet during printing. They can be used together at an appropriate ratio. Of course, these release agents are not limited to water-soluble or water-dispersible ones, and after the dye-receiving layer is formed, the release agent dissolved in the solvent is applied to the surface of the dye-receiving layer and then dried to form a 0.1 to 0.1- A release layer of about 1.0 μm may be formed. A preferred release layer is formed by using a reactive silicone such as hydroxy-modified, amino-modified, epoxy-modified, carboxy-modified, or mercapto-modified, and, if necessary, cross-linked with a polyol, polyisocyanate, or a catalyst. Things.

The thermal transfer image-receiving sheet of the present invention can be used for various purposes such as a sheet- or roll-shaped thermal transfer image-receiving sheet, cards, and a sheet for producing a transparent original by appropriately selecting a base sheet. It can also be applied to Further, the thermal transfer image-receiving sheet of the present invention can be provided with a cushion layer between the base sheet and the dye receiving layer as needed, and by providing such a cushion layer, noise during printing is reduced and image information is reduced. A corresponding image can be transferred and recorded with good reproducibility.

The thermal transfer sheet used when performing thermal transfer using the thermal transfer image-receiving sheet of the present invention as described above is one in which a dye layer containing a sublimable dye is provided on paper or polyester film. Any thermal transfer sheet can be used as it is in the present invention. As a means for applying thermal energy at the time of thermal transfer, any conventionally known applying means can be used. For example, a thermal printer (for example,
By controlling the recording time with a recording device such as a video printer VY-100 manufactured by Hitachi, Ltd., it is possible to sufficiently achieve the intended purpose by applying a thermal energy of about 5 to 100 mJ / mm ^2. I can do it.

[0026]

The present invention will be described more specifically with reference to Synthesis Examples, Reference Examples and Examples. In the following description, parts or% are based on weight unless otherwise specified. Synthesis Example 1 In an autoclave equipped with a thermometer and a stirrer, 48 mol of dimethyl terephthalic acid, 4 mol of dimethyl sodium sulfoisophthalate, 48 mol of dimethyl isophthalic acid, TC
20 mol of D-M, 80 mol of ethylene glycol and 0.5 mol of tetrabutoxytitanate as a catalyst were charged, and the mixture was heated at 150 ° C. to 220 ° C. for 3 hours to carry out transesterification. And gradually reduce the system pressure to 0.3 mmH after 45 minutes.
g, and the reaction was continued for further 90 minutes under these conditions to obtain a pale yellow transparent polyester resin 1 (molecular weight: 18,00
0). In the same manner, a polyester resin shown in Table 1 below was obtained. Further, these polyester resins were dissolved in butyl cellosolve, and the resulting solution was dropped into water to prepare a dispersion of the polyester resin, and the solid content was adjusted to 30%.

[0027]

[Table 1]

Various performances of the thermal transfer image-receiving sheet in the following examples were evaluated according to the following evaluation criteria. Preparation of Thermal Transfer Sheet Used for Evaluation An ink composition for forming a dye-carrying layer having the following composition was prepared, and a 6 μm-thick polyethylene terephthalate film having a heat-resistant treatment on the back surface had a dry coating amount of 1.0 g / m ² . The resultant was applied and dried with a wire bar to obtain a thermal transfer sheet. Ink composition: Dye having the following structure 1.0 part Polyvinyl butyral resin 10.0 parts Methyl ethyl ketone / toluene (weight ratio 1/1) 90.0 parts

Embedded image

Evaluation method The above-described thermal transfer sheet and the thermal transfer image-receiving sheets of Examples and Comparative Examples described later were superposed on each other with the respective dye layers and the dye-receiving surface facing each other. 0 V, pulse width 16 msec. Recording was performed with a thermal head under the conditions of a dot density of 6 dots / line, and each performance was evaluated as follows. (1) Print Sensitivity (OD) The reflection density of each image was measured by a Macbeth densitometer RD-914, and the relative value was set to 1.00 in the comparative example .

(2) Light fastness test method The printed matter was measured at 100 KJ / m ² (420 n) with a xenon fadeometer (Ci-35A, manufactured by Atlas).
m) Irradiation, the change in optical density before and after irradiation was measured with an optical densitometer (RD-918, manufactured by Macbeth), and the residual ratio of optical density was calculated by the following equation. Residual rate (%) = {[optical density after irradiation] / [optical density before irradiation]} × 100 ○; residual rate is 85% or more Δ; residual rate is 80% or more and less than 85% ×; residual rate is 80 %Less than

(3) Fingerprint resistance evaluation method A fingerprint is imprinted on the surface of a printed matter and left at room temperature for 5 days.
The degree of discoloration and density change of the fingerprint imprinted part was visually evaluated. A: Almost no difference was observed between the fingerprint-printed area and the non-printed area. B: Discoloration or density change was observed. C: The fingerprint imprinted portion was white and the fingerprint shape was clearly recognized. D: White spots occurred around the fingerprint-printed area, and at the same time, aggregation of the dye was observed. (4) Evaluation method of plasticizer resistance The same part of the printed matter surface was lightly rubbed five times with a commercially available plastic eraser, and the degree of density change was visually determined. ：: Almost no change in concentration was observed. Δ: Density change was observed. X: The density changed greatly, and white spots were observed from the low density area to the middle density area.

The thermal transfer image receiving sheet of the comparative example is as follows.
Manufactured. Synthetic paper (made by Oji Yuka, thickness
110 μm) on one side of the coating having the following composition.
When the working liquid is dried with a wire bar, it becomes 5.0 g / m ² .
Coated and dried at a ratio to obtain the thermal transfer image receiving sheet of Comparative Example.
And evaluated according to the evaluation criteria described above, and the results are shown in Table 4 below.
Noted. Coating composition: 10.0 parts polyester resin of Comparative Example in Table 1 Catalyst cross-linked silicone (X-62-1212, manufactured by Shin-Etsu Chemical Co., Ltd.) 1.0 part Platinum catalyst (PL-50T, manufactured by Shin-Etsu Chemical Co., Ltd.) 0 .1 part methyl ethyl ketoton / toluene (weight ratio 1/1) 89.0 parts

Reference Example 1 A synthetic paper (manufactured by Oji Yuka, thickness 110 μm) was used as a base sheet.
m), a coating liquid having the following composition was applied to one surface of the coating with a wire bar at a rate of 5.0 g / m ² when dried, and a thermal transfer image-receiving sheet of Reference Example 1 was obtained. Coating liquid composition; mixture of polyester resin 2 in Table 1 and resin in Table 2 below (weight ratio: 7/3) Water dispersion (solid content: 30%) 100 parts Water dispersible silicone (X-52-550B, solid) 40%, Shin-Etsu Chemical Co., Ltd.) 7.5 parts

[0034]

[Table 2] The resin used in Reference Example 1 in Table 2 is a polysol series manufactured by Showa Polymer Co., Ltd.

[0035]

Examples 1-2 The following coating liquid was used in place of the coating liquid in Reference Example 1,
Others were the same as in Reference Example 1, producing a thermal transfer image-receiving sheet.
An image was formed and evaluated, and the results shown in Table 4 below were obtained. Coating liquid composition; 100 parts of resin dispersion of Table 3 (solid content 30%) Water-dispersible silicone (X-52-550B, solid content 40%, Shin-Etsu Chemical Co., Ltd.) 7.5 parts

[0037]

[Table 3]

Composition of polycarbonate resin 1: the following structural unit A / the following structural unit B = 5/5 (weight ratio) Composition of the polycarbonate resin 2: the following structural unit A / the following structural unit B = 3/7 (weight ratio)

[0039]

Embedded image

[0040]

[Table 4]

[0041]

According to the present invention as described above, the dye-receiving layer is formed by using a dispersion comprising a mixed dye-receptive resin dispersed in an aqueous medium. Durability such as plasticity is improved. In another preferred embodiment of the present invention, a polyester resin is used as the dye-receiving resin, and a small amount of a sulfonic acid group or a salt thereof is introduced into the polyester resin so that the polyester resin can be easily added to an aqueous medium. By imparting hydrophilicity that is dispersed in, and by using a resin having good dye-dyeing properties, without using a general-purpose solvent, to give a clear image with sufficient density, and of the image to be formed A thermal transfer image-receiving sheet with improved durability such as fingerprint resistance and plasticizer resistance can be provided.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yasushi Yamada 1-1-1, Ichigaya-Kagacho, Shinjuku-ku, Tokyo Inside Dai Nippon Printing Co., Ltd. (72) Inventor Jun Hasegawa 1-1, Ichigaga-cho, Shinjuku-ku, Tokyo No. 1 Dai Nippon Printing Co., Ltd. (56) References JP-A-62-238790 (JP, A) JP-A-2-70487 (JP, A) JP-A-4-197786 (JP, A) JP-A JP-A-5-185748 (JP, A) JP-A-62-294596 (JP, A) JP-A-61-27290 (JP, A) JP-A-5-131176 (JP, A) JP-A-5-131762 (JP, A A) (58) Field surveyed (Int. Cl. ⁷ , DB name) B41M 5/38-5/40

Claims (5)

(57) [Claims] 1. A thermal transfer image-receiving sheet having a dye-receiving layer formed on at least one surface of a substrate sheet, wherein the dye-receiving layer is a mixture of an aqueous dispersion of a polyester resin and an aqueous dispersion of a polycarbonate resin, or In a thermal transfer image-receiving sheet formed from a coating liquid composed of an aqueous dispersion of a mixture of both resins, the polyester resin has a solubility in methyl ethyl ketone, toluene, ethyl acetate, chloroform or ethanol of 5% by weight or less at 25 ° C, The polycarbonate resin has structural units represented by the following general formulas (1) and (2), and has a general formula (1)
And the molar ratio of the structural unit represented by the general formula (2) is 30 /
A thermal transfer image-receiving sheet comprising a random copolycarbonate resin having a ratio of 70 to 70/30. Embedded image (Wherein R _{1 to} R ₈ represent a hydrogen atom, a halogen atom or an alkyl group having 1 to 4 carbon atoms, and A represents a linear, branched or cyclic alkylidene group having 1 to 10 carbon atoms, an aryl-substituted alkylidene group) A group, an aryl group or a sulfonyl group;
Represents an oxygen atom or a sulfur atom) 2. The thermal transfer image-receiving sheet according to claim 1, wherein the polyester resin has a hydrophilic group. 3. The thermal transfer image-receiving sheet according to claim 1, wherein the polycarboxylic acid component of the polyester resin has a small amount of a sulfonic acid group or a salt thereof. 4. The thermal transfer image-receiving sheet according to claim 1, wherein the coating liquid further contains a water-dispersible or water-soluble silicone oil and / or a water-dispersible or water-soluble ultraviolet absorber. 5. The thermal transfer image receiving sheet according to claim 1, wherein a release layer made of a reactive silicone is formed on the surface of the dye receiving layer.