JP2010012703A - Thermal transfer receptive sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a thermal transfer receptive sheet in which there is neither bleeding of picture nor show through of dye in the high-temperature environment and which can be utilized for a photography application or the like. <P>SOLUTION: The thermal transfer receptive sheet comprises an intermediate layer and an image receiving layer sequentially laminating on at least one surface of a sheet-like support, wherein the intermediate layer is formed by coating and drying a coating material including a vinyl chloride-based resin and an alkylene glycol ether compound. Preferably, the SP value of the alkylene glycol ether compound is 9.0-11.0 (cal/cm<SP>3</SP>)<SP>1/2</SP>. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a thermal transfer receiving sheet having good storage stability and having no image bleeding or dye penetration in a high temperature environment.

  The dye thermal transfer method includes a dye thermal transfer sheet having a dye layer (hereinafter also simply referred to as “ink ribbon”) and a thermal transfer receiving sheet having an image receiving layer for receiving the dye (hereinafter also simply referred to as “receptor sheet”). In this method, the dye layer and the image receiving layer are superposed and the dye is transferred onto the image receiving layer by heating to form an image. Heating is performed with a thermal head, and a full-color image is formed with multicolored dots. Since the dye is used, the image is clear and highly transparent, and a high-quality image usable for photographic use is obtained.

For the image receiving layer of the receiving sheet, a resin having good dye dyeing property is used, and thermoplastic resins such as polyurethane resins, polyester resins, cellulose resins, acrylic resins and the like have been proposed. In addition, as the sheet-like support of the receiving sheet, papers and films, or so-called bonded base materials obtained by bonding them are proposed.
In the dye thermal transfer system, the dye is transferred to the image receiving layer by heating to form an image. However, the dye used in the dye thermal transfer system has a property of easily diffusing in a high temperature environment. For this reason, when the printed receiving sheet is placed in a high-temperature environment or the like, the dye dyed on the image receiving layer diffuses into the adjacent sheet-like support, and as a result, there is a problem that the image is blurred. Furthermore, there is a problem that the dye diffused in the sheet-like support reaches the back surface of the receiving sheet and the back surface is colored so-called “back-through”, which impairs the appearance of the product.
In order to solve the above problem, a proposal has been made to provide an intermediate layer mainly composed of a vinyl chloride resin between the sheet-like support and the image receiving layer (Patent Document 1). The vinyl chloride resin has a high affinity for the dye used in the dye thermal transfer system. For this reason, even in a high-temperature environment, the dye dyed on the image receiving layer is adsorbed by the vinyl chloride resin in the adjacent intermediate layer and does not diffuse any more. Diffusion can be prevented. However, in order to uniformly form an intermediate layer mainly composed of a vinyl chloride resin on the sheet-like support, it is necessary to dry at a sufficiently high temperature when the intermediate layer coating is applied. When the drying temperature is low, the film formation of the vinyl chloride resin becomes insufficient, so that there is a problem that cracks are generated on the surface of the intermediate layer and the effect of preventing the diffusion of the dye in the intermediate layer is impaired. In addition, when the temperature of the intermediate layer drying step is sufficiently high, the vinyl chloride resin is sufficiently formed and the effect of preventing dye diffusion can be exerted, but the sheet-like support exposed to high temperature is thermally contracted. As a result, there is a problem that the unevenness occurs, the smoothness of the resulting receiving sheet is poor, and the image uniformity is impaired.
JP 02-43092 A (first page)

  The present invention aims to provide a thermal transfer receiving sheet which improves the above-mentioned drawbacks of the prior art and does not cause image bleeding or dye penetration in a high temperature environment and has good storage stability.

  As a result of intensive studies to solve the above problems, the present inventor has arrived at the present invention configured on the basis of the following technical matters.

That is,
(1) In a thermal transfer receiving sheet in which an intermediate layer and an image receiving layer are sequentially laminated on at least one surface of a sheet-like support, the intermediate layer is coated and dried with a paint containing a vinyl chloride resin and an alkylene glycol ether compound. A thermal transfer receiving sheet characterized by being formed.
(2) The thermal transfer receiving sheet according to (1), wherein the solubility parameter of the alkylene glycol ether compound is 9.0 to 11.0 [(cal / cm ³ ) ^1/2 ].
(3) The thermal transfer receiving sheet according to (1) or (2), wherein the alkylene glycol ether compound has a boiling point of 90 to 160 ° C.

  According to the present invention, there can be obtained a thermal transfer receiving sheet having good storage stability without image bleeding or dye penetration in a high temperature environment.

The present invention relates to a thermal transfer receiving sheet in which an intermediate layer and an image receiving layer are sequentially laminated on at least one surface of a sheet-like support, wherein the intermediate layer is coated with a paint containing a vinyl chloride resin and an alkylene glycol ether compound. It is characterized by being formed.
The present invention is described in detail below.

(Sheet support)
As the sheet-like support, papers and synthetic resin sheets mainly composed of cellulose pulp are used. Examples of paper include high-quality paper (acidic paper, neutral paper), medium-quality paper, coated paper, art paper, glassine paper, and resin-laminated paper. Examples of the sheet mainly composed of a synthetic resin include polyolefins such as polyethylene and polypropylene, polyesters such as polyethylene terephthalate, polyamide, polyvinyl chloride, polystyrene, polycarbonate, polyvinyl alcohol, and polyvinyl chloride. Examples of the porous stretched sheets include synthetic paper and porous polyester sheet, which are mainly composed of a thermoplastic resin such as polyolefin and polyester. Examples of the laminates include a porous stretched sheet, a sheet in which a porous stretched sheet and another sheet and / or paper are laminated and adhered.

The smoothness on the receiving layer surface side of the sheet-like support is preferably 50 seconds or more. If it is less than 50 seconds, the smoothness of the obtained receiving sheet may be insufficient, and the image uniformity may be impaired. The smoothness is an index of the smoothness of the sheet surface. Obtained by measuring the flow rate of air flowing between the reference surface and the surface of the specimen under a certain condition. TAPPI paper pulp test method no. 5 (Oken smoothness).
(Middle layer)
The intermediate layer coating contains a vinyl chloride resin and an alkylene glycol ether compound. When the intermediate layer coating is applied, the alkylene glycol ether compound acts as a film forming aid for the vinyl chloride resin, and a uniform and crack free intermediate layer coating film can be formed even at a lower drying temperature.
Vinyl chloride resin is a polar polymer having a highly polar chlorine atom in the molecule, and has a large attractive force between molecules. The alkylene glycol ether compound has a polar part such as an ether group or a hydroxyl group and a nonpolar part such as an alkyl group in the molecule. When an alkylene glycol ether compound is added to a vinyl chloride resin, the polar portion of the vinyl chloride resin and the polar portion of the alkylene glycol ether compound are electrically attracted to each other. Furthermore, since the nonpolar part of the alkylene glycol ether compound functions to widen the interval between vinyl chloride resin molecules, it is considered that the vinyl chloride resin can be softened.
In the present invention, the alkylene glycol ether compound preferably has a boiling point of 90 to 160 ° C., more preferably 95 to 140 ° C. If the boiling point of the alkylene glycol ether compound to be used is less than 90 ° C., the alkylene glycol ether compound evaporates in a short time in the drying process at the time of coating, and the effect as a film forming aid becomes insufficient. As a result, the intermediate layer coating layer becomes uneven or cracks, and the effect of preventing dye diffusion necessary for the intermediate layer is impaired.
When the boiling point of the alkylene glycol ether compound to be used exceeds 160 ° C., when the obtained printed matter of the receiving sheet is placed in a high temperature environment, image bleeding or show-through may occur. The alkylene glycol ether compound having a boiling point exceeding 160 ° C. is considered to remain in the intermediate coating layer depending on the drying conditions. The alkylene glycol ether compound is a compound having a low affinity with the dye, and when it remains in the intermediate layer, the affinity of the dye of the vinyl chloride resin is lowered. As a result, the dye adsorption effect that the intermediate layer should originally exhibit is impaired, and the dye is likely to diffuse through the sheet-like support, and image bleeding and back-through are likely to occur.
A well-known thing can be used as an alkylene glycol ether compound.
For example,
Ethylene glycol methyl ether, boiling point 124 ° C
Ethylene glycol dimethyl ether, boiling point 85 ° C
Ethylene glycol ethyl ether Boiling point 135 ° C
Ethylene glycol monoiso-butyl ether Boiling point 160 ° C
Ethylene glycol monopropyl ether Boiling point 149.5 ° C
Ethylene glycol monoiso-propyl ether Boiling point 141 ° C
Diethylene glycol dimethyl ether, boiling point 162 ° C
Propylene glycol methyl ether Boiling point 120 ° C
Propylene glycol dimethyl ether, boiling point 97 ° C
Propylene glycol-iso-butyl ether Boiling point 157 ° C
Etc.
In order to increase the effect of assisting the film formation of the vinyl chloride resin, it is desirable to select and use an alkylene glycol ether compound having good compatibility with the vinyl chloride resin. Since the solubility parameter of the vinyl chloride resin is 9.0 to 11.0 [(cal / cm ³ ) ^1/2 ], the alkylene glycol ether compound also has a solubility parameter of 9.0 to 11.0 [ It is preferable to use those of (cal / cm ³ ) ^1/2 ]. If the solubility parameter is less than 9.0 [(cal / cm ³ ) ^1/2 ] or more than 11.0 [(cal / cm ³ ) ^1/2 ], the alkylene glycol ether compound and the vinyl chloride resin Insufficient compatibility may result in an insufficient effect of the alkylene glycol ether compound as a film forming aid.
The solubility parameter is a numerical value that serves as a guideline for determining the ease with which substances are mixed. The smaller the difference in solubility parameter value between substances, the easier the substances are mixed. The solubility parameter δ is calculated from the molar evaporation heat ΔH and the molar volume V:
δ = (ΔH / V) ^1/2
Fedor et al. Have proposed a calculation method (Fedor Polym. Eng. Sci. 14 (1974), 147 472).
The alkylene glycol ether compound preferably has a solubility in water of 40% by mass or more. When the solubility in water is less than 40% by mass, when added to an intermediate layer coating material containing a water-dispersed resin as a main component, troubles such as aggregation may occur without being stably dispersed.
The addition amount of the alkylene glycol ether compound contained in the intermediate layer is 1 to 20% by mass, preferably 2 to 10% by mass with respect to 100% by mass of the dry mass of the intermediate layer coating material. If it is less than 1 mass%, the effect as a film-forming aid is insufficient, and the intermediate layer may not form a uniform continuous film. If it exceeds 20% by mass, the residual amount of the alkylene glycol ether compound increases after the drying step, which may inhibit the effect of preventing diffusion of the dye in the intermediate layer.
The intermediate layer of the present invention contains a vinyl chloride resin. Since the vinyl chloride resin has a high affinity with the dye in the thermal transfer system, if it is contained in an intermediate layer between the sheet-like support and the image receiving layer, the dye dyed on the image receiving layer is contained in the sheet-like support. It can be prevented from spreading.
Examples of the vinyl chloride resin include copolymers of vinyl chloride and other comonomers. Comonomers copolymerized with vinyl chloride monomer include, for example, vinyl esters of fatty acids such as vinyl acetate, vinyl propionate, and vinyl palmate, acrylic acid, methacrylic acid, methyl acrylate, ethyl methacrylate, butyl acrylate, methacrylic acid. Acrylic acid or methacrylic acid such as 2-hydroxyethyl acid and 2-ethylhexyl acrylate and alkyl esters thereof, maleic acid such as maleic acid and diethyl maleate and alkyl esters thereof, methyl vinyl ether, 2-ethylhexyl vinyl ether, etc. And alkyl vinyl ethers. Among these copolymers, a copolymer of vinyl chloride and vinyl acetate is particularly preferable in terms of good affinity with the dye.
The vinyl chloride copolymer may be any of a block copolymer, a graft copolymer, an alternating copolymer, and a random copolymer.

As the vinyl chloride resin, those having a hydrophilic group introduced are preferably used. As the vinyl chloride resin used in the present invention, a water-dispersed resin is used. By introducing a hydrophilic group into the molecule, the vinyl chloride resin can be stably dispersed in water. Examples of the hydrophilic group include a carboxyl group, a hydroxyl group, and a sulfone group, and the carboxyl group is particularly preferable from the viewpoint of dispersion stability.

  Examples of the method for introducing a carboxyl group into the vinyl chloride resin include a method of adding a compound having a carboxyl group such as maleic acid during polymerization.

The vinyl chloride monomer composition ratio in the vinyl chloride resin is preferably 60 to 95% by mass. If the vinyl chloride monomer composition ratio is less than 60% by mass, the affinity for the dye may be insufficient, and the dye diffusion preventing effect may be insufficient. If it exceeds 95% by mass, the film formability is inferior, and cracks may occur when the intermediate coating layer is formed.
In order to improve coatability, it is preferable to add a thickener, a wetting agent, an antifoaming agent, etc. to an intermediate | middle layer.
Moreover, it is preferable to add a crosslinking agent to the intermediate layer in order to improve heat resistance and water resistance. In this case, in order to accelerate the curing reaction of the crosslinking agent, it is preferable to perform a heat treatment at about 30 to 60 ° C. in any step after the intermediate layer coating. This heat treatment can also be expected to promote the evaporation of the alkylene glycol ether compound remaining in the intermediate layer.
The coating amount of the intermediate layer is preferably 0.5 to 10 g / ^{m 2,} more preferably 1 to 5 g / ^{m 2.} If it is less than 0.5 g / m ² , the dye diffusion preventing effect may be insufficient. If it exceeds 10 g / m ² , the effect obtained for an increase in cost is small.

(Image receiving layer)
The image receiving layer is mainly composed of a resin having a good dyeing property. Examples of the dyeable resin include known resins such as polyurethane resins, polyester resins, cellulose resins, and acrylic resins.
In the thermal transfer system, printing is performed by heating from a thermal head, and the image receiving layer is required to have heat resistance that can withstand heating. Therefore, it is preferable to add a crosslinking agent to the image receiving layer for the purpose of improving heat resistance. Examples of the crosslinking agent include polyisocyanate compounds, epoxy compounds, oxazoline compounds, carbodiimide compounds, organometallic compounds, and the like, and among them, polyisocyanate compounds and carbodiimide compounds are preferable from the viewpoint of heat resistance.
In thermal transfer printing, the image receiving layer of the receiving sheet and the dye layer of the ink ribbon are superposed and heated with a thermal head, and then the ink ribbon is peeled off from the image receiving layer. Sex is also required. Therefore, it is preferable to add a release agent to the image receiving layer for the purpose of preventing fusion with the ink ribbon and improving printing runnability. Examples of the release agent to be added include silicone oil and polysiloxane graft acrylic resin.
For the purpose of improving image durability, an antioxidant or an ultraviolet absorber can be further added to the image receiving layer.
The coating amount of the receiving layer is preferably 1 to 10 g / m ² . If it is less than 1 g / m ² , the dyeing property may be insufficient, and if it exceeds 10 g / m ² , the effect obtained for an increase in cost is small.
(Cushion layer)

In the receiving sheet of the present invention, a cushion layer containing hollow particles and an adhesive component is preferably formed between the sheet-like support and the intermediate layer. Thermal transfer printing is performed by heating from a thermal head, and requires good adhesion between the thermal head and the receiving sheet.
By forming a cushion layer on the receiving sheet and imparting cushioning properties, adhesion to the thermal head is improved, and a more uniform image can be obtained during printing. The material and manufacturing method of the hollow particles used in the cushion layer are not particularly limited, and specific examples of the material for forming the walls of the hollow particles include acrylonitrile, vinylidene chloride, and a polymer of styrene acrylate. Examples of a method for producing these hollow particles include a method in which butane gas is sealed in resin particles and heated and foamed, and an emulsion polymerization method.

As for the coating amount of a cushion layer, 1-30 g / m < ² > is preferable. If it is less than 1 g / m ² , the cushioning property may be insufficient, and if it exceeds 30 g / m ² , the effect obtained for an increase in cost may be insufficient.

  The receiving sheet may be subjected to a calendar process. This is to reduce unevenness on the surface of the obtained receiving sheet and obtain a uniform image. The calendar treatment may be performed at any stage after coating of the intermediate layer, the barrier layer, and the receiving layer. As a calendar device used for the calendar process, a calendar device generally used in the paper industry such as a super calendar, a soft calendar, a gloss calendar, a clearance calendar, and the like can be appropriately used.

Various auxiliary agents such as wetting agents, dispersants, thickeners, antifoaming agents, colorants, antistatic agents, preservatives and the like used in the production of general coated papers are appropriately added to each coating layer. The
For the receiving layer and other coating layers, use a known coater such as a bar coater, gravure coater, comma coater, blade coater, air knife coater, gate roll coater, die coater, curtain coater, and slide bead coater. A predetermined coating solution can be applied and dried.

  Hereinafter, the present invention will be described in more detail with reference to examples. Unless otherwise specified, “parts” and “%” in the examples all represent “parts by mass” and “% by mass”, and are solid amounts except for those relating to solvents. Tg indicates a glass transition temperature.

Example 1
(Sheet support A)
Art paper having a thickness of 150 μm (trade name: OK Kanto N, Oji Paper Co., Ltd., basis weight 174.4 g / m ² ) was used as the sheet-like support A.

(Formation of cushion layer A)
On the sheet-like support A, a cushion layer coating solution A having the following composition was coated and dried so that the solid content coating amount was 20 g / m ² to form the cushion layer A.
Cushion layer coating liquid A
45 parts polyvinyl alcohol (trade name: PVA205, manufactured by Kuraray Co., Ltd.) 10 parts polybutadiene resin 45% polyvinyl alcohol (trade name: PVA205, manufactured by Kuraray Co., Ltd.) made of a copolymer mainly composed of acrylonitrile and methacrylonitrile (Product name: LX111, Tg = −80 ° C., manufactured by ZEON Corporation) 45 parts Water 200 parts

(Formation of intermediate layer A)
On the cushion layer A, an intermediate layer A was formed by coating and drying an intermediate layer coating liquid A having the following composition so that the solid content coating amount was 2 g / m ² .
Intermediate layer coating solution A
75 parts of vinyl chloride resin (trade name: Vinibrand 603, manufactured by Nissin Chemical,
Vinyl chloride vinyl acetate copolymer resin dispersion,
(Vinyl chloride / vinyl acetate = 70/30, Tg 64 ° C.)
5 parts of an alkylene glycol ether compound (ethylene glycol ethyl ether, boiling point 135 ° C.,
SP value 9.9 [(cal / cm ³ ) ^1/2 ], solubility in water ∞)
20 parts of polyisocyanate compound (trade name: IS-70N, manufactured by Nikka Chemical, solid content 100%)
200 parts of water
(Preparation of receiving sheet A)
On the intermediate layer A, a receiving layer coating solution A having the following composition is coated and dried so that the solid content coating amount is 2 g / m ^2, and smoothed by a thermal calendar, and then received. A sheet was obtained.
Receiving layer coating liquid A
90 parts of urethane emulsion (trade name: Neo Sticker # 1700, Tg 20 ° C., manufactured by Nikka Chemical)
5 parts of polyisocyanate compound (trade name: IS-70N, manufactured by Nikka Chemical, solid content 100%)
5 parts of polysiloxane graft acrylic resin (trade name: US450, manufactured by Toagosei, solid content 25%)
300 parts of water

Example 2
In Example 1, a cushion sheet was not formed, and a receiving sheet was prepared in the same manner as in Example 1 except that the intermediate layer coating liquid B having the following composition was used instead of the intermediate layer coating liquid A. .
Intermediate layer coating solution B
75 parts of vinyl chloride resin (trade name: Vinibrand 603, manufactured by Nissin Chemical,
Vinyl chloride vinyl acetate copolymer resin dispersion, Tg 64 ° C)
5 parts of an alkylene glycol ether compound (ethylene glycol methyl ether, boiling point 124 ° C.,
SP value 12.5 [(cal / cm ³ ) ^1/2 ], solubility in water ∞)
20 parts of polyisocyanate compound (trade name: IS-70N, manufactured by Nikka Chemical, solid content 100%)
200 parts of water Example 3
In Example 1, a receiving sheet was prepared in the same manner as in Example 1 except that instead of the intermediate layer coating liquid A, an intermediate layer coating liquid C having the following composition was used.
Intermediate layer coating solution C
75 parts of vinyl chloride resin (trade name: Vinibrand 603, manufactured by Nissin Chemical,
Vinyl chloride vinyl acetate copolymer resin dispersion, Tg 64 ° C)
18 parts of alkylene glycol ether compound
(Propylene glycol dimethyl ether, boiling point 97 ° C.,
SP value 8.3 [(cal / cm ³ ) ^1/2 ], solubility in water 43.6% by mass)
10 parts of polyisocyanate compound (trade name: IS-70N, manufactured by Nikka Chemical, solid content 100%)
200 parts of water Example 4
In Example 1, a receiving sheet was prepared in the same manner as in Example 1 except that instead of the intermediate layer coating liquid A, an intermediate layer coating liquid D having the following composition was used.
Intermediate layer coating solution D
75 parts of vinyl chloride resin (trade name: Vinibrand 603, manufactured by Nissin Chemical,
Vinyl chloride vinyl acetate copolymer resin dispersion, Tg 64 ° C)
5 parts of an alkylene glycol ether compound (propylene glycol dimethyl ether, boiling point 97 ° C.,
SP value 8.3 [(cal / cm ³ ) ^1/2 ], solubility in water 43.6% by mass)
High boiling point alkylene glycol compound 2 parts (propylene glycol, boiling point 187 ° C)
10 parts of polyisocyanate compound (trade name: IS-70N, manufactured by Nikka Chemical, solid content 100%)
200 parts of water Example 5
In Example 1, a receiving sheet was prepared in the same manner as in Example 1 except that instead of the intermediate layer coating liquid A, an intermediate layer coating liquid E having the following composition was used.
Intermediate layer coating solution E
75 parts of vinyl chloride resin (trade name: Vinibrand 690, manufactured by Nissin Chemical
Vinyl chloride acrylic copolymer resin dispersion,
(Vinyl chloride / acrylic = 80/20, Tg 46 ° C.)
5 parts of alkylene glycol ether compound
(Ethylene glycol ethyl ether, boiling point 135 ° C.,
SP value 9.9 [(cal / cm ³ ) ^1/2 ], solubility in water ∞)
10 parts of polyisocyanate compound (trade name: IS-70N, manufactured by Nikka Chemical, solid content 100%)
200 parts of water

Example 6
In Example 1, a receiving sheet was prepared in the same manner as in Example 1 except that instead of the intermediate layer coating solution A, an intermediate layer coating solution F having the following composition was used.
Intermediate layer coating solution F
75 parts of vinyl chloride resin (trade name: Vinibrand 603, manufactured by Nissin Chemical,
Vinyl chloride vinyl acetate copolymer resin dispersion, Tg 64 ° C)
5 parts of an alkylene glycol ether compound (ethylene glycol dimethyl ether, boiling point 85 ° C.,
SP value 8.8 [(cal / cm ³ ) ^1/2 ], solubility in water ∞)
20 parts of polyisocyanate compound (trade name: IS-70N, Nikka Chemical, solid content 100%)
200 parts of water Example 7
In Example 1, a receiving sheet was prepared in the same manner as in Example 1 except that instead of the intermediate layer coating solution A, an intermediate layer coating solution G having the following composition was used.
Intermediate layer coating solution G
75 parts of vinyl chloride resin (trade name: Vinibrand 603, manufactured by Nissin Chemical,
Vinyl chloride vinyl acetate copolymer resin dispersion, Tg 64 ° C)
5 parts of an alkylene glycol ether compound (propylene glycol propyl ether, boiling point 150 ° C.,
SP value 9.8 [(cal / cm ³ ) ^1/2 ], solubility in water ∞)
20 parts of polyisocyanate compound (trade name: IS-70N, manufactured by Nikka Chemical, solid content 100%)
200 parts of water Comparative Example 1
In Example 1, a receiving sheet was prepared in the same manner as in Example 1 except that the intermediate layer was not provided.
Comparative Example 2
In Example 1, a receiving sheet was prepared in the same manner as in Example 1 except that instead of the intermediate layer coating solution A, an intermediate layer coating solution H having the following composition was used.
Intermediate layer coating solution H
75 parts of polyester resin (trade name: EW210, manufactured by SK Chemicals,
Polyester resin dispersion, Tg 60 ° C)
5 parts of an alkylene glycol ether compound (propylene glycol propyl ether, boiling point 150 ° C.,
SP value 9.8 [(cal / cm ³ ) ^1/2 ], solubility in water ∞)
20 parts of polyisocyanate compound (trade name: IS-70N, manufactured by Nikka Chemical, solid content 100%)
200 parts of water

Evaluation The following tests were conducted on the receiving sheets obtained in the above Examples and Comparative Examples. The obtained results are shown in Table 1.

[Image bleeding]
Using a commercially available thermal transfer video printer (trade name: UP-50, manufactured by Sony Corporation) equipped with a sublimation type thermal transfer ink ribbon (trade name: UP-540, manufactured by Sony Corporation), a black thin line was printed in a room temperature environment. After the printed matter was placed in a 50 ° C./30% RH environment for 24 hours, the blur of the black thin line was visually evaluated and shown in Table 1.
(Double-circle): A black fine line is not blotted at all, and there is no problem in practical use.
○: The black thin line is slightly blurred but is practical.
X: The blur of the black thin line is severe and is not suitable for practical use.

[Back-through]
Using a commercially available thermal transfer video printer (trade name: UP-50, manufactured by Sony Corporation) equipped with a sublimation type thermal transfer ink ribbon (trade name: UP-540, manufactured by Sony Corporation), a black solid image was formed on the obtained receiving sheet. Printed. After the printed matter was placed in a 60 ° C./60% RH environment for 24 hours, the back penetration of the dye on the back side of the receiving sheet was visually evaluated and shown in Table 1.
A: The appearance of the back surface of the receiving sheet is not changed, and there is no practical problem.
○: The appearance of the back side of the receiving sheet is slightly changed, but is practical.
X: The back surface of the receiving sheet is colored and the appearance is remarkably impaired. Not suitable for practical use.

表１から明らかなように、実施例１〜６の熱転写受容シートは、高温環境において画像の滲みや染料の裏抜けがない、保存性良好な熱転写受容シートである。

As can be seen from Table 1, the thermal transfer receiving sheets of Examples 1 to 6 are thermal transfer receiving sheets with good storage stability that are free from image bleeding and dye penetration in a high temperature environment.

  INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide a thermal transfer receiving sheet with good storage stability that does not cause image bleeding or dye penetration in a high temperature environment, and is extremely useful in practice.

Claims (3)

  In a thermal transfer receiving sheet in which an intermediate layer and an image receiving layer are sequentially laminated on at least one surface of a sheet-like support, the intermediate layer is formed by applying and drying a paint containing a vinyl chloride resin and an alkylene glycol ether compound. A thermal transfer receiving sheet. The thermal transfer receiving sheet according to claim 1, wherein the solubility parameter of the alkylene glycol ether compound is 9.0 to 11.0 [(cal / cm ³ ) ^1/2 ].   The thermal transfer receiving sheet according to claim 1 or 2, wherein the alkylene glycol ether compound has a boiling point of 90 to 160 ° C.