JPH05155159A - Composite thermal transfer sheet - Google Patents

Abstract

(57) [Summary] [Purpose] To solve the conventional problems, reduce the manufacturing cost,
Also, to provide a composite thermal transfer sheet capable of forming a high-quality color image regardless of the type of the image receiving sheet. [Structure] The present invention is provided on one surface of a long base film.
In a composite thermal transfer sheet in which a dye layer of a color or a plurality of colors and a transferable dye receiving layer that can be peeled off are sequentially provided, and a detection mark is provided at a required position, the transferable dye receiving layer is a base material. The peelable dye receiving layer, the barrier layer, the bubble-containing layer and the adhesive layer, which are sequentially laminated from the film side, and the detection mark is formed from the same forming agent as at least one of the barrier layer, the bubble-containing layer and the adhesive layer. A composite thermal transfer sheet characterized in that

Description

Detailed Description of the Invention

[0001]

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

[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). Further, as a method for simplifying 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 receiving layer is further formed on the same base film. There is known a composite thermal transfer sheet in which a receiving layer is first 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, for protecting the formed dye image. A composite thermal transfer sheet in which a transferable protective layer is further provided in a frame order is also proposed. In these composite thermal transfer sheets, detection marks corresponding to the respective layers are simultaneously formed by printing so that the printer can detect the respective layers.

However, in the case of manufacturing a composite thermal transfer sheet including various layers as described above, there is a problem that a large number of printing times (coating times) is required to form each layer, resulting in a high manufacturing cost. Therefore, the object of the present invention is to
It is an object of the present invention to provide a composite thermal transfer sheet which solves the above-mentioned conventional problems, suppresses the manufacturing cost, and can form a high-quality color image regardless of the type of the image receiving sheet.

[0005]

The above object can be achieved by the present invention described below. That is, according to the present invention, a dye layer of one color or a plurality of colors and a transferable dye receiving layer that can be peeled off are sequentially provided on one surface of a long base film, and a detection mark is provided at a required position. In the composite thermal transfer sheet, the transferable dye receiving layer is composed of a peelable dye receiving layer, a barrier layer, a bubble-containing layer and an adhesive layer, which are sequentially laminated from the substrate film side, and the detection mark is a barrier layer, A composite thermal transfer sheet comprising the same forming agent as at least one of the bubble-containing layer and the adhesive layer.

[0006]

By forming the detection mark in the composite thermal transfer sheet from the same forming agent as at least one of the barrier layer, the bubble-containing layer and the adhesive layer forming the transferable dye receiving layer, the number of printings can be reduced. It is possible to suppress an increase in manufacturing cost.

[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 composite thermal transfer sheet of the present invention has a dye layer of one color or a plurality of colors, for example, yellow (2Y), magenta, on one surface of the long base film 1, as schematically shown in the cross section of FIG. (2M), cyan (2
C) and, if necessary, a black (Bk) (not shown) dye layer 2, a transferable dye receiving layer 3, a detection mark 4 and, if necessary, a transferable protective layer 5 are provided in a frame order, The dye receiving layer comprises a release layer 31 provided as necessary, a dye receiving layer 32, a barrier layer 33, a bubble containing layer 34, and an adhesive layer 35 provided as necessary, and the transfer protection layer 5 is required. It comprises a peeling layer 51, a protective layer 52 and an adhesive layer 53 which are provided in accordance with the above. In addition, magenta 2M and cyan 2C
Although each of the dye layers is composed of two layers in order to obtain the density, it may be a single layer. In the composite thermal transfer sheet of the present invention, the detection mark 4 and at least one of the barrier layer 33, the bubble-containing layer 34 and the adhesive layer 35 in the above structure are formed from the same forming agent (paint or ink). or,
The detection mark 4 may be formed of the same forming agent as the adhesive layer 53. The detection mark is required to have a certain level of strength, and normally it is preferable to contain a white pigment or a metallic pigment so that it is light-reflecting.On the other hand, the barrier layer has a high strength and a white pigment or filling as described later. Since they are formed so as to contain the agent, they have many similarities. Therefore, the detection mark is more preferably formed from the same forming agent as the barrier layer. Further, the dye receiving layer 32 and the protective layer 52 may be formed of the same resin. Reference numeral 6 in the figure is a heat resistant slipping layer. FIG. 2 is a plan view schematically showing the composite thermal transfer sheet of the present invention.

As the base film 1 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 materials can be used without any particular limitation. Specific examples of the preferable base film include, for example, thin paper such as glassine paper, condenser paper, and paraffin paper, polyester,
Examples thereof include plastics such as polypropylene, cellophane, polycarbonate, cellulose acetate, polyethylene, polyvinyl chloride, polystyrene, nylon, polyimide, polyvinylidene chloride, and ionomer, or a base film in which these are combined with the above paper. The thickness of the base film can be appropriately changed according to the material so that the strength and heat resistance thereof are appropriate, but the thickness is
It is preferably 3 to 100 μm.

The dye layer formed on the surface of the substrate film 1 as described above is a layer in which a dye is carried 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 Red G, Macrol
ex Red Violet R, Ceres Red7B, Samaron Red HBSL, Res
olin Red F3BS and the like, and as the yellow dye,
Holon Brilliant Yellow 6GL, PTY-52, Macrolex Yellow 6G, and the like, and blue dyes such as Kayaset Blue 714, Waxolin Blue AP-FW, Holon Brilliant Blue SR, and MS Blue 100.

As the binder resin for carrying 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, acetic acid. Cellulose, cellulosic resins such as cellulose acetate butyrate,
Polyvinyl alcohol, polyvinyl acetate, polyvinyl butyral, polyvinyl acetoacetal, polyvinylpyrrolidone, vinyl resins such as polyacrylamide, polyesters, and the like. Among these, cellulose-based, acetoacetal-based, butyral-based, polyester-based, etc. Are preferable from the viewpoint of heat resistance, dye migration, and the like.

Further, the dye layer may further contain various conventionally known additives, if necessary. Such a dye layer is
Preferably, the above-mentioned sublimable dye, binder resin and other optional components are added to a suitable solvent to dissolve or disperse each component to prepare a dye layer-forming coating material or ink, which is prepared on the above-mentioned base film. It is formed by sequentially applying and drying it on the surface. The dye layer thus formed has a thickness of 0.2-5.
The sublimable dye in the dye layer has a thickness of 0 μm, preferably 0.4 to 2.0 μm.
Suitably it is present in an amount of 90% by weight, preferably 10-70% by weight. The dye receiving layer 3 formed on the surface of the base film 1 is for receiving the sublimable dye transferred from the thermal transfer sheet after the transfer to an arbitrary image receiving sheet and maintaining the formed image. ..

The dye-receptive layer 3 (and the protective layer 5) is provided on the dye layer in a frame-sequential manner. The relationship with the dye layer is not particularly limited. For example, as shown in FIG. 1 and FIG. 2, one unit is generally in the order of receiving layer → Y → M → C → Bk → protective layer, but the order is not limited to this. Not done. The dyes of the respective hues are usually provided in the same area, but the receiving layer (or protective layer) should be transferred twice or more depending on the type of material to be transferred and the durability required for the image. In some cases, it may be required to form a larger area. Prior to the formation of the receiving layer (protective layer), it is preferable to form the release layers 31 and 51 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 receiving layer described later, and the thickness thereof is preferably about 0.5 to 5 μm. When a matte receiving layer is desired after transfer, the release layer may be made to have a matte surface by incorporating various particles or using a base film having a matte surface. Of course, when the base film as described above has an appropriate releasability, it is not necessary to form the release layer.

The dye receiving layer 3 and the protective layer 5 may be made of different resins, but may be made of the same resin.
Examples of resins for forming these layers include polyolefin resins such as polypropylene, polyvinyl chloride, vinyl chloride / vinyl acetate copolymers, halogenated polymers such as polyvinylidene chloride, polyvinyl acetate, and polyacrylic esters. Such as vinyl polymer, polyethylene terephthalate, polyester resin such as polybutylene terephthalate, polystyrene resin, polyamide resin,
Examples thereof include copolymer resins of olefins such as ethylene and propylene and other vinyl monomers, ionomers, cellulosic resins such as cellulose diacetate, polycarbonates and the like, and particularly preferable ones are vinyl resins and polyester resins.

A release agent is preferably used in combination with the resin forming the receiving layer. Preferred releasing agents to be mixed with the resin include silicone oils, phosphate ester type surfactants, fluorine type surfactants and the like, but silicone oils are preferable. As the silicone oil,
Modified silicone oils such as epoxy modified, alkyl modified, amino modified, carboxyl modified, alcohol modified, fluorine modified, alkyl aralkyl polyether modified, epoxy / polyether modified, and polyether modified are 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 3 is obtained by dissolving one of the above-mentioned base film and one of the above-mentioned resins, in which a necessary additive such as a releasing agent is added to the above-mentioned resin, in a suitable organic solvent or an organic solvent. A dispersion dispersed in a solvent or water, for example, gravure printing method,
It is formed by applying and drying by a forming means such as a screen printing method or a reverse roll coating method using a gravure plate. The dye receiving layer (protective layer) formed as described above may have any thickness, but generally 1 to 1
It has a thickness of 0 μm. Further, such a dye receiving layer (protective layer) is preferably a continuous coating, but it may be formed as a discontinuous coating by using a resin emulsion or a resin dispersion.

Further, in the present invention, as shown in FIG. 1, a barrier layer 33 and a bubble containing layer 34 are provided on the receiving layer 32. The barrier layer 33 prevents the receiving layer from being deformed or destroyed by the expansion of bubbles in the bubble-containing layer after transferring the transferable receiving layer 3 to the transfer material, and imparts strength to the receiving layer. Have a purpose. Such a barrier layer 33
Are, for example, polyurethane resin, acrylic resin, polyethylene resin, cellulose resin, butadiene rubber,
It is made of epoxy resin or the like. The preferred resin is a relatively hard acrylic resin, and as the acrylic resin having a high hardness, a lower alkyl ester of (meth) acrylic acid such as polymethylmethacrylate or polymethylacrylate is preferred, but other (meth) acrylic monomers are preferred. Even
For example, a polyfunctional monomer such as divinylbenzene, ethylene glycol di (meth) acrylate, or trimethylolpropane tri (meth) acrylate may be blended to crosslink at least part of the resulting acrylic resin.
As a method of crosslinking, a method such as heat, ultraviolet ray, electron beam or the like can be arbitrarily adopted.

Various resins for increasing the whiteness and barrier layer hardness for improving whiteness by dissolving the above resin in an appropriate organic solvent such as acetone, ethyl acetate, methyl ethyl ketone, toluene, xylene and cyclohexanone. A paint or an ink is prepared by optionally adding additives such as a filler, and the dye or the ink is prepared by a forming means such as a gravure printing method, a screen printing method or a reverse roll coating method using a gravure plate. A barrier layer is formed by coating and drying on top. The thickness of the barrier layer thus formed is preferably about 0.5 to 20 μm. The bubble-containing layer 34 imparts appropriate cushioning properties and heat insulating properties to the receptor layer 3 after transfer. If the following adhesive resin is used as the binder of the bubble containing layer 34, the formation of the adhesive layer can be omitted. The bubble-containing layer is composed of bubbles and a binder. Although any resin can be used as the binder, a heat-sensitive adhesive having good adhesiveness to the receiving layer is preferable. Examples of these adhesives include two-component curing type polyurethane resin, epoxy resin, vinyl acetate resin and acrylic resin emulsion, which are used for film lamination in the prior art.
Thermoplastic resins such as ethylene-vinyl acetate copolymer type, polyamide type, polyester type, polyolefin type and the like can be advantageously used.

The bubbles contained in these resins are formed from a foaming agent. Examples of such a foaming agent include dinitropentamethylenetetramine and diazoaminobenzene which are decomposed by heat to generate gases such as oxygen, carbon dioxide and nitrogen. , Azobisisobutyronitrile, decomposing type foaming agents such as azodicarbamide, known foaming agents such as microballoons in which low boiling point liquids such as butane and pentane are microencapsulated with resins such as polyvinylidene chloride and polyacrylonitrile. Any of these can be used, and a foam obtained by previously foaming these microballoons, a microballoon coated with a white pigment, and the like can also be effectively used. In the above, the microcapsule foaming agent such as microspheres is particularly preferable in that it does not cause defects such as pinholes in the barrier layer or the receiving layer after transfer, because the bubbles have an outer wall even after foaming. These foaming agents may be in a foamed state in the layer, may be in an unfoamed state, or may be in an intermediate state. However, the foaming agent is in an unfoamed or incompletely foamed state in the cell layer, and foaming by heat applied from the thermal head at the time of transfer of the transferable receiving layer 3 or image formation gives excellent cushioning properties. Most preferred in terms. The amount of the above-mentioned foaming agent or foam used is such that the expansion ratio of the bubble-containing layer is in the range of about 1.5 to 20 times, for example, 0.
It is preferably used in a proportion of 5 to 200 parts by weight.

In addition to the above-mentioned foaming agent, various whitening agents such as fluorescent whitening agents and white pigments such as titanium oxide are added to the bubble-containing layer to improve the whiteness of the receiving layer after transfer. Further, when the base sheet is paper, the yellowness of the paper can be hidden. Of course, other optional additives such as extender pigments and fillers may be added as necessary. These bubble-containing layers are preferably 0.5 to 2
The thickness is about 0 μm. Furthermore, the above-mentioned bubble-containing layer 3
It is preferable to provide adhesive layers 35 and 53 on the surface of 4 (protective layer 52) in order to improve transferability of these layers. These adhesive layers are formed, for example, by applying and drying a solution of a resin having good adhesiveness at the time of heat such as polyamide resin, acrylic resin, vinyl chloride resin, vinyl chloride / vinyl acetate copolymer resin, polyester resin, etc. The thickness is preferably about 0.5 to 10 μm.

The detection mark 4 is formed of the same forming agent as the barrier layer 33 (or the adhesive layers 35 and 53), for example, paint or ink. A gravure printing method is suitable for forming the barrier layer 33 (or the adhesive layer 3).
5, 53) can be formed by the same gravure plate. The detection mark 4 is preferably white, and the barrier layer is also preferably white, so that they can be formed simultaneously from the same forming agent. Although the detection mark 4 is drawn in the same shape in the drawing, in actuality, it is formed as a mark of a different shape corresponding to each layer, such as a barcode, so that the printer can detect the type of each layer. Has been done. The coating amount of the detection mark 4 may be the same as the coating amount of at least one of the barrier layer, the bubble-containing layer and the adhesive layer. The image-receiving sheet for transferring the transferable receiving layer 3 and forming an image using the composite thermal transfer sheet as described above is not particularly limited, and examples thereof include plain paper, high-quality paper, tracing paper, and plastic film. Any sheet may be used, and in terms of shape, any of cards, postcards, passports, stationery, report paper, notebooks, catalogs, etc. may be used, and especially, it is applicable to plain paper with rough surface and rough paper. is there.

The transfer method of the receiving layer 3 and the protective layer 5 is carried out by using a general printer equipped with a thermal head for thermal transfer, a hot stamper for transfer foil, a heat roll, etc., at which the receiving layer or the adhesive layer is activated. Any heating / pressurizing means capable of heating to any temperature may be used. As a method for forming an image, any conventionally known means can be used. For example, a thermal printer (for example, video printer VY-10 manufactured by Hitachi Ltd.) can be used.
By controlling the recording time with a recording device such as 0), it is possible to sufficiently achieve the intended purpose by applying thermal energy of about 5 to 100 mJ / mm ² .

[0022]

EXAMPLES Next, the present invention will be described more specifically with reference to examples. In the text, “part” or “%” is based on weight unless otherwise specified. Example 1 A polyethylene terephthalate film (manufactured by Toray) having a thickness of 6.0 μm and having a heat resistant slipping layer formed on the back surface,
A release layer coating solution having the following composition was applied by a bar coater at a rate of 0.3 g / m ² on the basis of solid content and dried to form a release layer. Next, on the release-treated surface, using each of the following coating liquids, a receiving layer (solid content: 2.0 g / m ² , bar coater), a barrier layer (solid content: 3.0 g) with a width of 30 cm and an interval of 90 cm. / M ² gravure coater), bubble-containing layer (solid content 3.0 g / m ² ) and adhesive layer (solid content 2.0 g /
m ² bar coater). The detection mark (solid content 3.0 g / m ² ) was formed by printing on the side surface of each layer with the same plate as that for forming the barrier layer, as shown in FIG. After coating each layer, it was temporarily dried with a dryer and then dried in an oven at 100 ° C. for 30 minutes.

Coating liquid composition for release layer High Tg polyurethane resin (Crisbon 8566, manufactured by Dainippon Ink and Chemicals) 100 parts Dimethylformamide 500 parts Coating liquid composition for receiving layer Vinyl chloride / vinyl acetate copolymer resin (Electrochemical industry Made, degree of polymerization 320, 1000AS 100 parts Epoxy modified silicone (X-22-343, manufactured by Shin-Etsu Chemical Co., Ltd.) 3 parts Amino-modified silicone (KF-393, manufactured by Shin-Etsu Chemical Co., Ltd.) 3 parts Optical brightener (Ubitex) OB, manufactured by Ciba Geigy) 0.5 part Methyl ethyl ketone / toluene (weight ratio 1/1) 500 parts Coating liquid composition for barrier layer MMA acrylic resin (BR-85, manufactured by Sekisui Chemical Co., Ltd.) 100 parts Titanium oxide (Torchem Products) Co., Ltd., TCA888) 100 parts Silicon coupling agent (hardener 3, Showa Ink) 10 parts Methyl ethyl ketone / to Ene (1/1 by weight) 400 parts of the bubble-containing layer coating solution composition styrene-acrylic resin emulsion (AF-231, manufactured by Japan Synthetic Rubber) 100 parts foamable microcapsules (F-30VS, Matsumoto Yushi Seiyaku Co., Ltd.) 20 parts Pure water 100 parts Coating liquid composition for adhesive layer (HS-32 mat ink (Showa Ink)) Acrylic resin (BR-106, Sekisui Chemical Co., Ltd.) 100 parts Micro silica 2 parts Methyl ethyl ketone / toluene (weight ratio 1 / 1) 300 parts Subsequently, an ink for a dye layer having the following composition was prepared, and a gravure coater was applied so that a dry coating amount of each of the widths of 30 cm was 1.0 g / m ² on the surface of the base film on which the receiving layer was not formed. Was applied and dried to obtain a composite thermal transfer sheet of the present invention.

Ink composition for dye layer : Disperse dye (Kayaset Blue 714, manufactured by Nippon Kayaku Co., Ltd.) 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 disperse dye (Macrolex Yellow 6G, manufactured by Bayer, CI Disperse) was used for the yellow layer ink.
Yellow 201), and a magenta layer ink was formed using a magenta disperse dye (CIDisperse Red 60). Example 2 A composite thermal transfer sheet of the present invention was obtained in the same manner as in Example 1 except that titanium oxide was added to the bubble-containing layer instead of the barrier layer. Example 3 A composite thermal transfer sheet of the present invention was obtained in the same manner as in Example 1 except that titanium oxide was added to the adhesive layer instead of the barrier layer.

The transferable receiving layer surfaces of the composite thermal transfer sheets of Examples 1 to 3 and the postcard were superposed, and a thermal head was used to output 1 W / dot and a pulse width of 0.3 to 0.45.
Under the conditions of msec. and a dot density of 3 dots / mm, the receiving layer is transferred over the entire surface, and then a yellow signal obtained by color-separating the original is printed on the surface of the receiving layer to obtain a yellow dye layer. To form a yellow image. Further, a magenta dye is similarly added to the image area obtained above by a magenta signal,
Further, a cyan dye was transferred by the same cyan signal to form a full-color image.

[0026]

According to the present invention as described above, the detection mark in the composite thermal transfer sheet is formed from the same forming agent as at least one of the barrier layer, the bubble-containing layer and the adhesive layer forming the transferable dye receiving layer. As a result, the number of times of printing can be omitted, and the increase in manufacturing cost can be suppressed.

[0027]

[Brief description of drawings]

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

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

[Explanation of symbols]

 1: Substrate film 2: Dye layer 3: Transferable dye receiving layer 31, 51: Release layer 32: Dye receiving layer 33: Barrier layer 34: Bubble containing layer 35, 53: Adhesive layer 4: Detection mark 5: Transfer Protective layer 6: Heat resistant slipping layer

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[Procedure amendment]

[Submission date] December 2, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 is a diagram schematically illustrating a cross section and a plane of a composite thermal transfer sheet of the present invention.

[Explanation of Codes] 1: Substrate film 2: Dye layer 3: Transferable dye receiving layer 31, 51: Release layer 32: Dye receiving layer 33: Barrier layer 34: Bubble containing layer 35, 53: Adhesive layer 4: Detection mark 5: Transferable protective layer 6: Heat resistant slipping layer

Claims (5)

[Claims] 1. A long base film is provided with a dye layer of one color or a plurality of colors and a transferable dye receiving layer which can be peeled on one surface of the long base film, and a detection mark is provided at a required position. In the composite thermal transfer sheet, the transferable dye receiving layer comprises a peelable dye receiving layer, a barrier layer, a bubble-containing layer and an adhesive layer, which are sequentially laminated from the base film side.
A composite thermal transfer sheet, wherein the detection mark comprises the same forming agent as at least one of the barrier layer, the bubble-containing layer and the adhesive layer. 2. At least one of the detection mark, the barrier layer, the bubble-containing layer and the adhesive layer contains a white pigment.
The composite thermal transfer sheet according to. 3. A transferable protective layer is further provided in a frame-sequential manner,
The composite thermal transfer sheet according to claim 1, wherein the protective layer is formed of the same resin as the dye receiving layer. 4. The thermal transfer image-receiving sheet according to claim 1, wherein the barrier layer is formed of an acrylic resin or an acrylic resin in which at least a part thereof is crosslinked. 5. The bubble-containing layer also serves as an adhesive layer.
The thermal transfer image-receiving sheet as described in 1.