JPH05238164A - Receiving layer transfer sheet and composite thermal transfer sheet - Google Patents

Abstract

PURPOSE:To prevent the generation of blocking and various problems accompanied thereby even in a state wound in a roll form and to form a color image of high quality regardless of the kind of an image receiving sheet. CONSTITUTION:A receiving layer transfer sheet is obtained by forming a releasable transfer dye receiving layer on one surface of a long base film and characterized in that an adhesive layer 4 composed of a thermoplastic resin with a glass transition temp. of 50-80 deg.C is provided on the transfer dye receiving layer 3. A composite thermal transfer sheet is obtained by successively forming a single- color or plural-color dye layer 2 and a releasable transfer dye receiving layer 3 on one surface of a long base film and characterized in that an adhesive layer 4 composed of a thermoplastic resin with a glass transition temp. of 50-80 deg.C is provided on the surface of the transfer dye receiving layer 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a receptor layer transfer sheet and a composite thermal transfer sheet, and more particularly to a receptor layer transfer sheet and a composite thermal transfer sheet capable of forming a high quality color image by a thermal transfer method.

[0002]

2. Description of the Related Art Conventionally, various thermal transfer methods have been known. Among them, a sublimable dye is used as a recording agent, which is carried on a base film such as paper or plastic film to form a thermal transfer sheet, which is used as a dye receiving sheet. There have been proposed methods for forming various full-color images on an image-receiving sheet such as a layered paper or plastic film. In this case, the thermal head of the printer is used as the heating means, and a large number of three-color or four-color dots are transferred to the image-receiving sheet by heating for an extremely short time, and the full-color image of the original is formed by the multi-color dots. It is to be reproduced.

[0003]

The image-receiving sheet capable of forming an image by the above-mentioned method is limited to a dye-stainable plastic sheet or a paper having a dye-receiving layer provided in advance. Has a problem that an image cannot be directly formed. Of course, even ordinary plain paper can be image-formed by forming a receiving layer on the surface thereof, but this is generally costly. For example, a postcard,
It is difficult to apply to general off-the-shelf image-receiving sheets such as memos, notepapers, and report sheets. As a method for solving such a problem, when an image is formed on a ready-made image receiving sheet such as plain paper, a receiving layer transfer sheet is used as a method for easily forming a dye receiving layer only on the necessary part. It is known (see, for example, JP-A-62-264994). To further simplify the operation, each dye layer of yellow, cyan, magenta and, if necessary, black is sequentially formed on the surface of the long base film, and the transferable dye is received on the same base film. There is known a composite thermal transfer sheet in which a layer is provided, first a receiving layer is transferred to an image receiving sheet, and then a dye of each color is transferred to the receiving layer to form a full color image, and further, in order to protect the formed dye image. There has also been proposed a composite thermal transfer sheet in which the protective layer of 1 is further provided in a frame order.

In the case of the above-mentioned receiving layer transfer sheet, since the dye receiving layer is formed of a resin which is relatively hard and has a high softening point, it is not easy to transfer it to an image receiving sheet such as paper, and therefore the transfer is performed. A method has been proposed in which an adhesive layer or a pressure-sensitive adhesive layer having a low softening point is provided on the surface of the functional dye receiving layer. However, since the receptor layer transfer sheet as described above is usually wound in a roll shape, there is a problem of so-called blocking in which the above-mentioned adhesive or pressure-sensitive adhesive sticks to the back surface of the base sheet, and the back surface of the base sheet. However, there is a problem that the function of the heat resistant slipping layer formed on the surface is deteriorated. Further, in the case of the above composite thermal transfer sheet, in addition to the above problem, the layer thickness of the transferable dye receiving layer is formed to be 3 to 4 times as thick as the layer thickness of the dye layer. , When wound in a roll, a large winding pressure is applied to that portion, and the adhesive or the resin having a low softening point formed on the surface of the transferable dye-receiving layer in a roll is the back surface of the base sheet. There is a problem that it adheres to the sheet and causes blocking, which lowers the transportability of the sheet and reduces the function of the back layer, and the dye in the dye layer transferred to the back layer transfers to the receiving layer or the protective layer. A so-called "kickback" phenomenon occurs, and various problems occur such that the obtained image becomes contaminated. Therefore, the object of the present invention is to solve the above-mentioned conventional problems, blocking does not occur even in a rolled state and various problems associated therewith, and a high-quality color image can be obtained regardless of the type of the image receiving sheet. An object is to provide a receptive layer transfer sheet and a composite thermal transfer sheet that can be formed.

[0005]

The above object can be achieved by the present invention described below. That is, in the present invention, a peelable transferable dye receiving layer is formed on one surface of a long base film, and the transferable dye receiving layer has a glass transition temperature of 5 or less.
A receptive layer transfer sheet having an adhesive layer made of a thermoplastic resin having a temperature of 0 to 80 ° C., and a dye layer of one color or a plurality of colors can be peeled off from one surface of a long base film. A transferable dye-receiving layer and a transferable dye-receiving layer are sequentially formed, and an adhesive layer made of a thermoplastic resin having a glass transition temperature of 50 to 80 ° C. is provided on the surface of the transferable dye-receiving layer. It is a composite thermal transfer sheet.

[0006]

[Function] The glass transition temperature is 5 on the surface of the transferable dye receiving layer.
By providing an adhesive layer made of a thermoplastic resin at 0 to 80 ° C., problems such as blocking and “kickback” and various problems associated with them do not occur even in a rolled state, and the type of image receiving sheet Regardless of the above, it is possible to provide a receptor layer transfer sheet and a composite thermal transfer sheet capable of forming a high quality color image.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in more detail with reference to the following preferred embodiments. The receptor layer transfer sheet of the present invention is provided with a transferable dye receptor layer 3 on one surface of a long base film 1 and an adhesive layer 4 on the surface thereof, as schematically shown in the cross section in FIG. 1a. The adhesive layer 4 is formed of a thermoplastic resin having a glass transition temperature of 50 to 80 ° C. In another embodiment shown in FIG. 1b, an intermediate layer 6 can be provided between the transferable dye receiving layer 3 and the adhesive layer 4 of FIG. 1a. 7 is a heat resistant slipping layer for the thermal head. Further, the composite thermal transfer sheet of the present invention has a dye layer 2 of one color or a plurality of colors on one surface of the long base film 1 as shown in the cross section of FIG.
For example, yellow (2Y), magenta (2M), cyan (2C) and optionally black (Bk) (not shown)
Dye layer 2, transferable dye receiving layer 3, adhesive layer 4 provided on the surface thereof, and transferable protective layer 5 which may be provided if necessary.
(And the adhesive layer 4 provided on the surface thereof) are provided in a frame-sequential manner, and the adhesive layer 4 has a glass transition temperature of 50 to 80 ° C.
It is characterized by being formed from a thermoplastic resin. Another embodiment shown in FIG. 3 shows a case where an intermediate layer 6 is provided between the transferable dye receiving layer 3 and the adhesive layer 4 of FIG. 7 is a heat resistant slipping layer for the thermal head.
In another embodiment shown in FIG. 4, the dye receiving layer region and the protective layer region of FIG. 3 are each divided into two, and one is used as the protective layer region,
This is an example in which the other is the receiving layer region, and this may be done.

As the base film used in the present invention, the same base film as that used in the conventional thermal transfer sheet can be used as it is, and other films can be used without any particular limitation. Specific examples of preferable base film include thin paper such as glassine paper, capacitor paper, paraffin paper, polyester, polypropylene, cellophane, polycarbonate, cellulose acetate, polyethylene, polyvinyl chloride, polystyrene, nylon, polyimide, polyvinylidene chloride. , A plastic such as an ionomer, or a base film in which these are combined with the preceding paper. The thickness of the base film can be appropriately changed according to the material so that the strength, heat resistance and the like are appropriate, but the thickness is
It is preferably 3 to 100 μm.

In the receiving layer transfer sheet of the present invention, the dye receiving layer formed on the surface of the base film is formed by receiving the sublimable dye transferred from the thermal transfer sheet after being transferred to any image receiving sheet. It is for maintaining the image. Prior to the formation of the receiving layer (or protective layer), it is preferable to form a release layer (not shown) on the surface of the base film. The release layer is formed from a release agent such as wax, silicone wax, silicone resin, fluororesin, acrylic resin or the like. The forming method may be the same as the forming method of the dye receiving layer, and the thickness thereof is preferably about 0.5 to 5 μm. When a matte receiving layer is desired after transfer, it may be formed into a matte surface by incorporating various particles in the release layer or by using a base film having the release layer side surface matt treated. I can. Of course, when the substrate film as described above has an appropriate releasability, it is not necessary to form the release layer.

As the resin for forming the dye receiving layer,
For example, polyolefin resins such as polypropylene, polyvinyl chloride, vinyl chloride / vinyl acetate copolymer, halogenated polymers such as polyvinylidene chloride, vinyl acetate, vinyl polymers such as polyacrylic ester, polyethylene terephthalate, polybutylene terephthalate, etc. Polyester resins, polystyrene resins, polyamide resins, copolymer resins of olefins such as ethylene and propylene with other vinyl monomers, ionomers, cellulose resins such as cellulose diacetate, polycarbonates, etc. are particularly preferable. Those are vinyl resins and polyester resins. Preferred releasing agents to be mixed with the above resins include silicone oils, phosphate ester type surfactants and fluorine type surfactants, with silicone oils being preferable. Examples of the silicone oil include epoxy-modified, alkyl-modified,
A modified silicone oil such as amino-modified, carboxyl-modified, alcohol-modified, fluorine-modified, alkylaralkylpolyether-modified, epoxy-polyether-modified or polyether-modified is desirable.

As the release agent, one type or two or more types are used. The amount of the release agent added is preferably 0.5 to 30 parts by weight with respect to 100 parts by weight of the resin for forming the dye receiving layer. If the addition amount range is not satisfied, problems such as fusion of the thermal transfer sheet and the dye receiving layer or deterioration of printing sensitivity may occur. By adding such a releasing agent to the dye receiving layer, the releasing agent bleeds out on the surface of the receiving layer after transfer to form a releasing layer. The receptive layer is obtained by dissolving one of the above-mentioned base film and a resin such as the above with necessary additives such as a release agent, in an appropriate organic solvent or by dispersing it in an organic solvent or water. The dispersion is applied and dried by a forming means such as a gravure printing method, a screen printing method and a reverse roll coating method using a gravure plate. The dye receiving layer formed as described above may have any thickness, but it is generally 1 to 10 μm. Further, such a dye receiving layer is preferably a continuous coating, but it may be formed as a discontinuous coating by using a resin emulsion or resin dispersion.

In the present invention, an adhesive layer is provided on the surface of the above-mentioned receiving layer in order to improve transferability of these layers. These adhesive layers need to be formed from a thermoplastic resin having a glass transition temperature of 50 ° C. to 80 ° C., and in the case of a resin having a glass transition temperature of less than 50 ° C., the blocking and various problems associated therewith occur. If it occurs or the image-receiving sheet is a paper with open eyes such as a postcard, the fluidity of the melted adhesive is too high, so that the paper may soak into the paper and the sealing effect and the adhesiveness decrease, etc. The object of the present invention is not achieved. On the other hand, the glass transition temperature of the thermoplastic resin forming the adhesive layer is 80.
When the temperature exceeds ℃, when the dye receiving layer is transferred with a thermal head, or when the environmental temperature is low (for example, in cold regions or winter)
The transferability is insufficient. Such an adhesive resin has a suitable glass transition temperature from a resin having a good adhesive property at the time of heat such as a polyamide resin, an acrylic resin, a vinyl chloride resin, a vinyl chloride / vinyl acetate copolymer resin, and a polyester resin. It is preferable to select one having the above composition, and to apply and dry the solution, preferably 0.5 to 10 μm.
It is formed to a thickness of a certain degree.

Further, in the present invention, an intermediate layer 6 can be provided between the receiving layer and the adhesive layer as shown in FIG. 1b. Examples of the material forming the intermediate layer include polyurethane resin, acrylic resin, polyethylene resin, butadiene rubber, and epoxy resin. The thickness of the intermediate layer is preferably about 2 to 10 μm. The method of forming the intermediate layer may be the same as that of the above-mentioned receiving layer. The above-mentioned adhesive layer and intermediate layer may contain a white pigment, an optical brightening agent and / or bubbles (or a foaming agent). These white pigments and fluorescent whitening agents improve the whiteness of the receiving layer after transfer, and conceal the pale yellow color of the image receiving sheet, and
The bubbles (or the foaming agent) have a function of imparting good cushioning properties to the receiving layer. As a method of incorporating these additives, a white pigment or the like may be incorporated in the coating liquid used when forming each layer. In this case, the protective layer should be transparent or translucent.

In the composite thermal transfer sheet of the present invention, a dye layer is formed on the surface of the substrate film as described above in a frame-sequential manner at predetermined intervals. The dye layer is a layer in which the dye is supported by an arbitrary binder resin. As the dye to be used, any of the dyes used in conventionally known thermal transfer sheets can be effectively used in the present invention and is not particularly limited. For example, some preferred dyes include red dyes such as MS RedG, Macrolex Red
Violet R, Ceres Red7B, Sama
ron Red HBSL, Resolin RedF
3BS and the like, yellow dyes such as Holon Brilliant Yellow 6GL, PTY-52 and Macrolex Yellow 6G, and blue dyes such as Kayaset Blue 714 and Waxolin Blue AP-.
FW, Holon Brilliant Blue SR, MS Blue 1
00 etc. are mentioned.

As the binder resin for supporting the dye as described above, any conventionally known binder resin can be used, and preferred examples include ethyl cellulose, hydroxyethyl cellulose, ethyl hydroxycellulose, hydroxypropyl cellulose, methyl cellulose and acetic acid. Cellulose, cellulosic resins such as cellulose acetate butyrate,
Polyvinyl alcohol, polyvinyl acetate, polyvinyl butyral, polyvinyl acetal, polyvinyl pyrrolidone, vinyl resins such as polyacrylamide, polyesters, and the like. Among these, cellulose-based,
Acetal-based, butyral-based, polyester-based, and the like are preferable from the viewpoint of heat resistance, dye migration, and the like. Further, the dye layer may further contain various conventionally known additives as required.

Such a dye layer is preferably prepared by adding the above-mentioned sublimable dye, binder resin and other optional components to a suitable solvent to dissolve or disperse each component to prepare a dye layer-forming coating material or ink. Then, this is applied on the above-mentioned substrate film in a frame-sequential manner and dried. The dye layer thus formed has a thickness of about 0.2 to 5.0 μm, preferably about 0.4 to 2.0 μm, and the sublimable dye in the dye layer contains 5% by weight of the dye layer. Suitably it is present in an amount of ˜90% by weight, preferably 10 to 70% by weight.
The transferable dye-receptive layer formed on the surface of the substrate film in a frame-sequential manner with respect to the dye layer is a sublimable dye which is transferred from a thermal transfer sheet after being transferred to any image-receiving sheet in the same manner as the above-mentioned transfer layer transfer sheet. To maintain the formed image.

The relationship between the transferable dye receiving layer and the dye layer is not particularly limited. For example, as shown in FIGS. 2 and 3, one unit is generally the order of receiving layer → Y → M → C → Bk → protective layer. However, the present invention is not limited to this and may be the example shown in FIG. 4 or another example. The dyes of the respective hues are usually provided in the same area, but the transferable dye-receptive layer (or protective layer) may be provided twice or more depending on the type of material to be transferred and the durability required for the image. In some cases, transfer is required, and therefore, it is possible to form a larger area. The method for forming the transferable dye receiving layer (or protective layer) or the intermediate layer may be the same as in the case of the receiving layer transfer sheet, except that the transferable dye receiving layer (or protective layer) or the intermediate layer is formed in a frame sequential manner. The transferable protective layer can be formed in the same manner as the transferable dye receiving layer as described above, but the formation of the intermediate layer is not necessary, and the transferable protective layer is such that an image can be observed through the layer. Therefore, it is necessary to be transparent or semi-transparent. The forming material, forming method, thickness and the like of the protective layer and the adhesive layer formed on the surface thereof may be the same as in the case of the receiving layer.

The image-receiving sheet for transferring the receptor layer and forming an image using the receptor-layer transfer sheet or the composite thermal transfer sheet as described above is not particularly limited, and examples thereof include plain paper, high-quality paper, and tracing. Any sheet such as paper or plastic film may be used, and in terms of shape, cards, postcards, passports, stationery, report paper, notebooks,
Any one such as a catalog may be used, and it is particularly applicable to plain paper and rough paper having a rough surface. The transfer method of the receptor layer and the protective layer may be a general printer equipped with a thermal head for thermal transfer, a hot stamper for transfer foil, a heat roll, or any other heating method capable of heating to a temperature at which the adhesive layer is activated. Pressure means may be used. Further, as a method for forming an image, any conventionally known means can be used, and for example, a thermal printer (for example, a video printer V manufactured by Hitachi Ltd.
By controlling the recording time with a recording apparatus such as Y-100), thermal energy of about 5 to 100 mJ / mm ² can be applied to sufficiently achieve the intended purpose.

[0019]

EXAMPLES Next, the present invention will be described more specifically with reference to Examples and Comparative Examples. In the text, “part” or “%” is based on weight unless otherwise specified. Examples 1 to 5 and Comparative Examples 1 to 3 A release-treated surface of a polyethylene terephthalate film (made by Toray) having a thickness of 6.0 μm in which a heat resistant slipping layer is formed on the back surface and the other surface is subjected to release processing. , Width 60 cm and spacing 90 c
m to form a receiving layer and (adhesive layer) and a protective layer (and adhesive layer). The receiving layer and the protective layer are formed by applying a coating solution having the following composition with a bar coater at a rate of 3.0 g / m ² when dried, temporarily drying with a dryer, and then drying in an oven at 100 ° C for 30 minutes. Then, the adhesive layer was similarly formed by applying and drying the following adhesive solution on the receiving layer surface and the protective layer surface at a rate of 3.0 g / m ² when dried.

Composition of coating liquid for receiving layer : Vinyl chloride / vinyl acetate copolymer resin (VYHD, manufactured by UCC) 100 parts Epoxy-modified silicone (KF-393, manufactured by Shin-Etsu Chemical Co., Ltd.) 8 parts Amino-modified silicone (X-22- 343, Shin-Etsu Chemical Co., Ltd.) 8 parts Methyl ethyl ketone / toluene (weight ratio 1/1) 400 parts Protective layer coating liquid composition : Vinyl chloride / vinyl acetate copolymer resin (VYHD, UCC) 100 parts Methyl ethyl ketone / toluene (weight) Ratio 1/1) 400 parts Adhesive layer coating liquid composition : Resin of Table 1 100 parts Methyl ethyl ketone / toluene (weight ratio 1/1) 300 parts Silica (antiblocking agent) Small amount

[0021]

[Table 1] Subsequently, an ink for the dye layer having the following composition was prepared, and the surface of the base film on which the receiving layer was not formed was coated with a gravure coater so that the dry coating amount was 30 cm by 30 cm each and the coating amount was 1.0 g / m ^2. Then, composite thermal transfer sheets of the present invention and comparative examples were obtained.

Ink composition for dye layer : Disperse dye (Kayaset Blue 714, manufactured by Nippon Kayaku) 4.0 parts Ethyl hydroxycellulose (manufactured by Hercules) 5.0 parts Methyl ethyl ketone / toluene (weight ratio 1/1) 80. 0 parts Dioxane 10.0 parts In the same manner, a yellow thermal transfer sheet was replaced with a yellow disperse dye (Macrolex Yellow 6G, Bayer Co., CI Disperse
From Yellow 201), and a magenta thermal transfer sheet was formed using a magenta disperse dye (CIDisperse Red 60). Example 6 The present invention was carried out in the same manner as in Example 1 except that the following intermediate layer coating solution was applied to the surface of the receiving layer at a rate of ² g / m ² and dried to form a white intermediate layer. A composite thermal transfer sheet of was obtained. Coating liquid composition for intermediate layer Acrylic resin (BR-106, manufactured by Mitsubishi Rayon) 100 parts Titanium oxide (manufactured by Tochem Products, TCA888) 50 parts Methyl ethyl ketone / toluene (weight ratio 1/1) 400 parts

Example 7 The procedure of Example 1 was repeated except that the following intermediate layer coating solution was applied to the surface of the receptor layer at a rate of ² g / m ² and dried to form a white intermediate layer. To obtain a composite thermal transfer sheet of the present invention. Coating liquid composition for intermediate layer Acrylic resin (BR-106, manufactured by Mitsubishi Rayon) 100 parts Azodicarbonamide foaming agent (Vinihol AK # 2, manufactured by Eiwa Chemical Co., Ltd.) 30 parts Titanium oxide (manufactured by Tochem Products, TCA888) 50 parts Methyl ethyl ketone / Toluene (weight ratio 1/1) 400 parts Example 8 The receiving layer surface and the postcard of the composite thermal transfer sheets of Examples 1 to 7 and Comparative Examples 1 to 3 were superposed, and a thermal head was used to output 1 W / Dot, pulse width 0.3-0.45m
sec. , The receiving layer is transferred over the entire surface under the condition of a dot density of 3 dots / mm, and then the yellow signal obtained by color separation of the original is printed on the surface of the receiving layer, and the yellow dye layer is overlaid. A yellow image was formed. Further, a magenta dye was similarly transferred to the image area obtained above by a magenta signal, and a cyan dye was transferred by a similar cyan signal to form a full-color image, and a protective layer was further transferred to the image surface.

Blocking property when the thermal transfer sheet used above is wound into a roll (diameter 10 cm),
When the transferability of the dye to the adhesive layer, the transferability of the receiving layer at low temperature (-10 ° C) and high temperature (40 ° C), and the quality of the obtained image were examined, the results shown in Table 2 below were obtained.

[Table 2]

Example 9 In Example 1, a transferable dye receiving layer and an adhesive layer made of various adhesives shown in Table 1 were formed on the entire surface of the base film to receive 8 types of the present invention and comparative examples. A layer transfer sheet was obtained. Using these receiving layer transfer sheets, the dye receiving layer was transferred onto the surface of plain paper with a heat roll, and an image was formed in the same manner as in Example 8 using the separately prepared three color heat transfer sheets, and the roll-shaped (diameter Blocking property when wound to 10 cm) and low temperature (-10 ° C) and high temperature (40
When the transferability of the receiving layer and the quality of the obtained image at (° C.) were examined, the same results as in Table 2 above were obtained.

[0026]

According to the present invention as described above, by providing an adhesive layer made of a thermoplastic resin having a glass transition temperature of 50 to 80 ° C. on the surface of the transferable dye receiving layer, blocking can be achieved even in a rolled state. PROBLEM TO BE SOLVED: To provide a receptive layer transfer sheet and a composite thermal transfer sheet capable of forming a high-quality color image regardless of the type of the image receiving sheet without causing problems such as "kickback" and various problems associated therewith. You can

[0027]

[Brief description of drawings]

FIG. 1 is a diagram schematically illustrating a cross section of a receiving layer transfer sheet of the present invention.

FIG. 2 is a diagram schematically illustrating a cross section of a composite thermal transfer sheet of the present invention.

FIG. 3 is a diagram schematically illustrating a cross section of a composite thermal transfer sheet of the present invention.

FIG. 4 is a diagram schematically illustrating a cross section of a composite thermal transfer sheet of the present invention.

[Explanation of symbols]

 1: Base film 2: Dye layer 3: Dye receiving layer 4: Adhesive layer 5: Protective layer 6: Intermediate layer 7: Heat resistant slipping layer

Claims (7)

[Claims] 1. A thermoplastic resin comprising a long base film and a transferable dye-receiving layer formed on one surface of the long-length base film, and having a glass transition temperature of 50 to 80 ° C. on the surface of the transferable dye-receiving layer. A receptive layer transfer sheet comprising an adhesive layer made of a resin. 2. A continuous base film, on one surface of which a dye layer of one color or a plurality of colors and a transferable dye-receptive layer which can be peeled off are sequentially formed, and the surface of the transferable dye-receptive layer. A composite thermal transfer sheet, wherein an adhesive layer made of a thermoplastic resin having a glass transition temperature of 50 to 80 ° C. is provided on. 3. The composite thermal transfer sheet according to claim 2, further comprising a transferable protective layer provided in a frame sequential manner. 4. The composite thermal transfer sheet according to claim 3, wherein an adhesive layer made of a thermoplastic resin having a glass transition temperature of 50 to 80 ° C. is provided on the surface of the transferable protective layer. 5. The composite thermal transfer sheet according to claim 3, wherein the receiving layer is white and the protective layer is transparent or translucent. 6. The transferable dye-receptive layer comprises an intermediate layer and an adhesive layer, and at least one of these layers is at least one selected from the group consisting of white pigments, optical brighteners and bubbles (or foaming agents). The receptor layer transfer sheet according to claim 1, further comprising a seed. 7. The transferable dye receiving layer comprises an intermediate layer and an adhesive layer, and at least one of these layers is at least one selected from the group consisting of white pigments, optical brighteners and bubbles (or foaming agents). The composite thermal transfer sheet according to claim 2, which contains a seed.