JPH061084A - Dye accepting layer transfer sheet and composite thermal transfer sheet - Google Patents

Abstract

PURPOSE:To make each laminated layer coincide and align with each other by forming, on one face of a continuous base material film, a peelable transfer dye accepting layer through a mold release layer which can be discriminated from the base material film, in a dye accepting transfer sheet. CONSTITUTION:A dye accept layer transfer sheet is constituted of a continuous base material film 1, a mold release layer 2 and a dye accepting layer 3 provided on one face of the film 1, and an adhesive layer 4 provided on the surface of the layer 3. For discriminating the mold release layer 2 formed on the base material film 1 from the base material film 1, additives such as, for example, UV absorbent, fluorescent whitening agent, non-sublimation dye or pigment are added to coating liquid for forming the mold release layer. In the case of the UV absorbent, the mold release layer 2 looks black under irradiation of UV rays as the base material film 1 normally contains a small quantity of fluorescent whitening agent. In the case of the fluorescent whitening agent, the mold release layer 2 looks blue with luster more than the base material film 1 under irradiation of the UV rays, so that it can be discriminated from the base material film 1. When the dye is used, the non-sublimation dye is used so as to prevent the dye accepting layer 3 from being contaminated with the dye.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dye receiving layer transfer sheet and a composite thermal transfer sheet, and more particularly to a dye receiving layer transfer sheet and 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 sublimation dye is used as a recording agent, and this is carried on a base material film such as paper or plastic film to form a thermal transfer sheet, which is used as a dye transfer material. There has been proposed a method of 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 multicolor dots. It is to be reproduced.

The image-receiving sheet capable of forming an image by the above method is limited to a dye-stainable plastic sheet or a paper having a dye-receptive layer provided in advance, and an image can be directly formed on ordinary plain paper. There is a problem that there is no. Of course,
Even ordinary plain paper can be image-formed by forming a dye-receptive layer on the surface thereof, but this is generally expensive, and for example, postcards, memos, letter papers, report papers, etc. It is difficult to apply to a general ready-made image receiving sheet such as. As a method of solving such problems, when trying to form an image on a ready-made image receiving sheet such as plain paper,
A dye-receiving layer transfer sheet is known as a method for easily forming a dye-receiving layer only in its necessary portion (for example,
(See 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 the dye receiving layer is transferred to an image receiving sheet, and then the dye of each color is transferred to the dye receiving layer to form a full color image,
Further, a composite thermal transfer sheet is further proposed in which a protective layer for protecting the formed dye image is further provided in a surface sequential manner.

[0004]

DISCLOSURE OF THE INVENTION Problems to be Solved When preparing the above-mentioned dye receiving layer transfer sheet or composite thermal transfer sheet, the layer containing the dye receiving layer is required to have good releasability,
Therefore, a release layer is often formed between the base film and the transferable dye receiving layer. In this case, since the release layer and the transferable dye receiving layer are formed by laminating, the transferable dye receiving layer needs to be formed in alignment with the surface of the release layer. When the release layer and the transferable dye receiving layer are continuously provided on the surface of the substrate film, there is no problem, but the release layer and the transferable dye receiving layer are discontinuous (for example,
When they are provided at regular intervals, both the base film and the release layer are often transparent, which makes it difficult to register the release layer with the transferable dye receiving layer. These problems are very important problems when producing a composite thermal transfer sheet in which a dye layer and / or a transfer protective layer are provided together with a transfer dye receiving layer on a continuous substrate film. Therefore, an object of the present invention is to solve the above-mentioned conventional problems and to provide a transferable dye-receiving layer on a base film through a release layer, in which these laminated layers are sufficiently aligned and matched. To provide a dye-receiving layer transfer sheet and a composite thermal transfer sheet.

[0005]

The above object can be achieved by the present invention described below. That is, according to the present invention, a transferable dye receiving layer which is peelable via a release layer is formed on one surface of a long base film, and the release layer is distinguishable from the base film. And a dye-receptive layer transfer sheet characterized in that one side of a long base film is formed with a dye layer of one or a plurality of colors and a releasable transferable dye-receptive layer in a face-sequential manner. The composite thermal transfer sheet is characterized in that the mold layer is distinguishable from the base film.

[0006]

When the transferable dye receiving layer is provided on the base material film through the release layer by making the release layer provided on the base film distinguishable from the base film, each of these laminated layers It is possible to provide a dye-receiving layer transfer sheet and a composite thermal transfer sheet which are sufficiently matched and aligned.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Next, the present invention will be described in more detail with reference to preferred embodiments. The dye-receptive layer transfer sheet of the present invention has a release layer 2, a dye-receptive layer 3 and an adhesive provided on the surface thereof on one surface of a long base film 1 as schematically shown in the cross section of FIG. 1a. A layer 4 is provided, and the release layer 2 is distinguishable from the base film 1. Another embodiment shown in FIG. 1b shows the case where an intermediate layer 7 is provided between the transferable dye receiving layer 3 and the adhesive layer 4 of FIG. 1a. 8 is a heat resistant slipping layer for the thermal head. Further, the composite thermal transfer sheet of the present invention has a dye layer 5 of one color or a plurality of colors, such as yellow (5), on one surface of the long base film 1, as shown in the cross section of FIG.
Y), magenta (5M), cyan (5C) and optionally black (Bk) (not shown) dye layer 5, a release layer 2 provided on the surface of the base film 1, and a dye receiving layer 3. Adhesive layer 4 and transferable protective layer 6 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 release layer 2 is distinguishable from the base film 1. Another embodiment shown in FIG. 3 is the intermediate layer 7 between the dye receiving layer 3 and the adhesive layer 4 of FIG.
The case where is provided is shown. 8 is a heat resistant slipping layer for the thermal head. Another embodiment shown in FIG. 4 is an example in which the dye receiving layer region and the protective layer region of FIG. 3 are each divided into two, one being the protective layer region and the other being the dye receiving layer region,
You may do this.

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 also be used and are not particularly limited. Specific examples of the preferable base film include thin paper such as glassine paper, condenser 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 and heat resistance thereof are appropriate, but the thickness is
It is preferably 3 to 100 μm.

In the dye-receiving layer transfer sheet of the present invention,
The release layer 2 is provided on the base film 1 prior to the formation of the dye receiving layer 3 (or the protective layer 6). Such a releasing layer is made of a material having excellent releasing property such as waxes, silicone wax, silicone resin, and fluorine resin, or a resin having a relatively high softening point which is not melted by the heat of the thermal head, for example, cellulose resin, It is formed from an acrylic resin, a polyurethane resin, a polyvinyl acetal resin, or a resin in which a thermal release agent such as wax is added to these resins. The forming method may be the same as the method for forming the dye receiving layer described later, and the thickness thereof is about 0.5 to 5 μm. When a matte dye-receiving layer is desired after transfer, various particles are included in the release layer or the surface of the release layer on the dye-receiving layer side is matted to form a surface mat. You can also do it. In order to make these release layers distinguishable from the base film, in the release layer-forming coating liquid, for example, an ultraviolet absorber,
A fluorescent whitening agent, a non-sublimable dye or a pigment may be contained. In the case of an ultraviolet absorber, since the base film usually contains a small amount of the optical brightening agent, the release layer looks black under the irradiation of ultraviolet rays, so that it can be distinguished from the base film. Further, in the case of a fluorescent whitening agent, the release layer appears to shine bluer than the base film under irradiation with ultraviolet rays, and is also distinguishable from the base film. In the case of a dye, a non-sublimable (non-migrating) dye such as a direct dye or an acid dye, so that the dye does not contaminate the dye receiving layer or the protective layer.
High molecular weight dyes, vat dyes, reactive dyes and the like may be used, and the pigment is not particularly limited because it has no sublimation property and may be an organic pigment or an inorganic pigment. It is not necessary to use a large amount of these additives for the purpose of distinguishing between the base film and the release layer. For example, 0.01 to 20% by weight of the release layer is sufficient.

In the dye-receiving layer transfer sheet of the present invention,
The dye receiving layer formed on the surface of the release layer 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. As the resin for forming the dye receiving layer, for example, polyolefin resin such as polypropylene, polyvinyl chloride, vinyl chloride / vinyl acetate copolymer, halogenated polymer such as polyvinylidene chloride, polyvinyl acetate,
Polyacrylic ester and other vinyl polymers, polyethylene terephthalate, polybutylene terephthalate and other polyester resins, polystyrene resins, polyamide resins, copolymer resins of olefins such as ethylene and propylene with other vinyl monomers, ionomers, and cellulose dimers. Cellulose-based resins such as acetate, polycarbonate, and the like are mentioned, and particularly preferable are vinyl-based resins and polyester-based resins. Preferred releasing agents to be mixed with the above resins include silicone oils, phosphate ester type surfactants, fluorine type surfactants and the like, but silicone oils are preferable. Examples of the silicone oil include epoxy-modified, alkyl-modified, amino-modified, carboxyl-modified, alcohol-modified, fluorine-modified,
Modified silicone oils such as 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 dye-receiving layer forming resin. If the addition amount range is not satisfied, problems such as fusion of the thermal transfer sheet and the dye receiving layer or reduction of printing sensitivity may occur. By adding such a release agent to the dye receiving layer, the release agent bleeds out on the surface of the dye receiving layer after transfer to form a release layer. The dye receiving layer, on one surface of the release layer, a resin obtained by adding necessary additives such as a release agent to the resin as described above, is dissolved in an appropriate organic solvent or in an organic solvent or water. Dispersed dispersion,
For example, it is formed by applying and drying 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 a resin dispersion.

In the present invention, it is preferable to provide an adhesive layer on the surface of the dye receiving layer in order to improve the transferability of these layers. Any conventionally known pressure-sensitive adhesive or heat-sensitive adhesive can be used for these adhesive layers, but it is more preferable to form them from a thermoplastic resin having a glass transition temperature of 50 ° C. to 80 ° C., for example, a polyamide resin, an acrylic resin. resin,
Vinyl chloride resin, vinyl chloride / vinyl acetate copolymer resin,
A resin having an appropriate glass transition temperature is selected from resins having good adhesiveness under heat such as polyester resin, and the solution is applied and dried to preferably form a film having a thickness of about 0.5 to 10 μm. To do. Further, in the present invention, as shown in FIG. 1b, an intermediate layer 7 can be provided between the dye receiving layer and the adhesive layer. 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 2 to 10 μm
A degree is preferable. The method for forming the intermediate layer may be the same as that for the dye receiving layer. White pigment in the adhesive layer and the intermediate layer,
Optical brighteners and / or bubbles (or blowing agents) can be included. These white pigments and fluorescent whitening agents improve the whiteness of the dye receiving layer after transfer and hide the light yellow color of the paper which is the image receiving sheet, and the air bubbles (or foaming agents) are used for dye receiving. It has the function of imparting good cushioning properties to the 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. The sizes of the regions of the release layer, the receiving layer, the intermediate layer, and the adhesive layer do not necessarily have to be the same. There is no problem even if the size of each layer is different as long as each layer is larger than at least the region where the receiving layer is transferred. For example, even if there is some misregistration by making the area of the release layer larger than the others, the transfer of the receiving layer is not hindered, and if the release layer is transparent, the deviation in appearance is not noticeable. That is, even if some misregistration occurs, it does not cause a problem. In this case, the protective layer should be transparent or translucent.

In the composite thermal transfer sheet of the present invention, the dye layer is formed on the surface of the substrate film as described above in a frame-sequential manner at a predetermined interval. Such a dye layer 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 RedG, Macrolex Red Violet R, and Ceres R.
ed7B, Samaron Red HBSL, Resolin Red F3BS, etc., and yellow dyes such as Holon Brilliant Yellow 6GL, PTY-52, Macrolex Yellow 6
G and the like, and examples of the blue dye include Kayaset Blue 714, Waxolin Blue AP-FW, Holon Brilliant Blue SR, MS Blue 100, and the like.

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 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 viewpoints of heat resistance, dye migration, and the like. Further, the dye layer may also contain various conventionally known additives as required. Such a dye layer is preferably prepared by adding the sublimable dye, a binder resin and other optional components in a suitable solvent to dissolve or disperse each component to prepare a dye layer-forming coating material or ink. Is formed on the above-mentioned base film by applying and drying the film in a frame-sequential manner. 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-receiving layer formed on the surface of the base film in the surface-sequential manner with respect to the dye layer is formed via a release layer as in the case of the dye-receiving layer transfer sheet, and transferred to any image receiving sheet. It is for receiving the sublimable dye transferred from the thermal transfer sheet later and maintaining 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 in the order of dye receiving layer → Y → M → C → Bk → protective layer. Although it is general, the present invention is not limited to this and may be the example shown in FIG. 4 or another example. Also, dyes of respective hues are usually provided in the same area, but the transferable dye receiving layer (or protective layer) is transferred twice or more depending on the type of image-receiving sheet and the durability required for the image. In some cases, it may be required to do so, so that it is possible to form a larger area. The method for forming the release layer, the transferable dye-receptive layer (or protective layer) or the intermediate layer may be the same as in the case of the dye-receptive layer transfer sheet except that it is provided 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 it is not necessary to form an intermediate layer, 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 dye receiving layer.

The image receiving sheet for transferring the dye receiving layer and forming an image using the dye receiving 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, Any sheet such as tracing paper or plastic film may be used, and in terms of shape, cards, postcards, passports, stationery, report paper,
Any of notebooks, catalogs, etc. may be used, and it is particularly applicable to plain paper and rough paper having a rough surface. The transfer method of the dye receiving layer and the protective layer is a general printer equipped with a thermal head for thermal transfer, a hot stamper for transfer foil, a heat roll, etc., which can be heated to a temperature at which the dye receiving layer or the adhesive layer is activated. Any heating and pressing means may be used.
As a method for forming an image, any conventionally known means can be used. For example, by controlling the recording time with a recording device such as a thermal printer (for example, a video printer VY-100 manufactured by Hitachi Ltd.),
By applying thermal energy of about 5 to 100 mJ / mm ² , the intended purpose can be sufficiently achieved.

[0017]

EXAMPLES Next, the present invention will be described more specifically with reference to Examples and Comparative Examples. In the text, parts and% are based on weight unless otherwise specified. Example 1 An easy-adhesion polyethylene terephthalate film (thickness 6.0 μm, manufactured by Toray) having a heat resistant slipping layer formed on the back surface was coated with the following release layer coating solution to give a dry amount of 1.0 g / m ² . Gravure printing is applied at intervals of 5 mm to repeatedly apply a width of 30 cm, and after temporary drying with a dryer, 1
Dry in an oven at 00 ° C. for 30 minutes to form a release layer, and further register the surface of the release layer with the following dye-receptive layer coating solution to obtain 3.0 g / m ² when dried by gravure printing. The mixture was applied at a ratio, temporarily dried by a dryer, and then dried in an oven at 100 ° C. for 30 minutes to form a dye receiving layer.
Further, on the surface thereof, the following adhesive layer coating liquid was similarly applied and dried at a rate of 3.0 g / m ² and dried to form an adhesive layer to form the dye-receiving layer transfer sheet of the present invention. Obtained.

Composition of coating liquid for release layer : Ethyl hydroxyethyl cellulose (manufactured by Hercules) 100 parts UV absorber (Tinuvin 234, manufactured by Ciba Geigy) 0.1 part Methyl ethyl ketone / toluene (weight ratio 1/1) 400 parts Dye Coating liquid composition 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 Industry) 8 parts Methyl ethyl ketone / toluene (weight ratio 1/1) 400 parts Adhesive layer coating liquid composition : Polyester resin (UE3201, Unitika, Tg65 ° C.) 100 parts Methyl ethyl ketone / toluene (weight ratio 1/1) 400 copies

Example 2 A dye receiving layer transfer sheet of the present invention was obtained in the same manner as in Example 1 except that the following coating liquid was used in place of the release layer coating liquid. Composition of coating liquid for release layer : Ethyl hydroxyethyl cellulose (manufactured by Hercules) 100 parts Optical brightener (Ubitex OB, manufactured by Ciba Geigy) 0.1 part Methyl ethyl ketone / toluene (weight ratio 1/1) 400 parts Example 3 A dye receiving layer transfer sheet of the present invention was obtained in the same manner as in Example 1 except that the following coating liquid was used in place of the release layer coating liquid in Example 1. Composition of coating liquid for release layer : Ethyl hydroxyethyl cellulose (manufactured by Hercules) 100 parts Titanium oxide (TTO-55 (A), manufactured by Ishihara Sangyo) 10 parts Methyl ethyl ketone / toluene (weight ratio 1/1) 400 parts

Example 4 A dye receiving layer transfer sheet of the present invention was obtained in the same manner as in Example 1 except that the following coating liquid was used in place of the release layer coating liquid. Composition of coating liquid for release layer : Ethyl hydroxyethyl cellulose (manufactured by Hercules) 100 parts Dye (PSD-150, manufactured by Nippon Soda) 10 parts Methyl ethyl ketone / toluene (weight ratio 1/1) 400 parts Example 5 On the surface of an easily-adhesive polyethylene terephthalate film (thickness 6.0 μm, manufactured by Toray) on which a hydrophilic layer is formed, the same release layer coating solution as in Example 1 is separated with a width of 60 cm and an interval of 90 cm in the same manner as in Example 1. Dye receiving layer and (adhesive layer) by forming a mold layer and performing registration on it
And a protective layer (and an adhesive layer) were formed. For the dye-receptive layer and the protective layer, a dye-receptive layer coating solution having the following composition is applied by gravure printing at a rate of 3.0 g / m ² when dried,
After temporary drying with a dryer, it is formed by drying in an oven at 100 ° C. for 30 minutes, and the adhesive layer is similarly dried using 3.0 g of the dye receiving layer surface and the protective layer surface using the adhesive solution described below.
It was formed by applying and drying at a ratio of / m ² .

Composition of coating liquid for dye 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, manufactured by Shin-Etsu Chemical Co., Ltd.) 8 parts Methyl ethyl ketone / toluene (weight ratio 1/1) 400 parts Coating liquid composition for protective layer : Vinyl chloride / vinyl acetate copolymer resin (VYHD, manufactured by UCC) 100 parts Methyl ethyl ketone / toluene ( Weight ratio 1/1) 400 parts Adhesive layer coating liquid composition : Butyral resin (BL-3, Sekisui Chemical Co., Tg 54 ° C) 100 parts Methyl ethyl ketone / toluene (weight ratio 1/1) 300 parts Silica (antiblocking agent ) Small amount Next, prepare an ink for the dye layer with the following composition and apply it to the surface of the base film where the dye receiving layer is not formed. S width 30cm
Each was coated and dried by a gravure coater so that the dry coating amount was 1.0 g / m ² , 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) 4.0 parts Ethyl hydroxycellulose (manufactured by Hercules) 5.0 parts Methyl ethyl ketone / toluene (weight ratio 1/1) 80. 0 part Dioxane 10.0 part In the same manner, a yellow thermal transfer sheet was replaced with a yellow disperse dye (Macrolex Yellow 6G, manufactured by Bayer Co., CI Disperse Yellow 2).
01), and a magenta thermal transfer sheet was formed using a magenta disperse dye (CI Disperse Red 60). Example 6 A composite thermal transfer sheet of the present invention was obtained in the same manner as in Example 5, except that the following coating liquid was used instead of the release layer coating liquid. Composition of release layer coating liquid : Ethyl hydroxyethyl cellulose (manufactured by Hercules) 100 parts Dye (PSD-150, manufactured by Nippon Soda) 10 parts Methyl ethyl ketone / toluene (weight ratio 1/1) 400 parts

Example 7 The same procedure as in Example 6 was carried out except that the following intermediate layer coating solution was applied to the surface of the dye receiving layer at a rate of ² g / m ² and dried to form a white intermediate layer. Thus, a composite thermal transfer sheet of the present invention 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 8 Example 6 In the same manner as in Example 6, except that the following intermediate layer coating liquid was applied at a rate of ² g / m ^{2 on} the surface of the dye-receiving layer and dried to form a white intermediate layer, the composite thermal transfer sheet of the present invention was obtained. Obtained. 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

Comparative Example 1 A receptor layer transfer sheet of Comparative Example was obtained in the same manner as in Example 3 except that titanium oxide was not added to the release layer. Comparative Example 2 A composite thermal transfer sheet of Comparative Example was obtained in the same manner as in Example 6 except that the ultraviolet absorber was not added to the release layer. In the above-mentioned Examples and Comparative Examples, the positional deviation (easiness of registration) during formation of each layer other than the release layer was compared, and the results are shown in Table 1 below.

[Table 1] The dye receiving layer surface and the postcard of the composite thermal transfer sheets of Examples 4 to 8 were superposed, and a thermal head was used to output 1
W / dot, pulse width 0.3 to 0.45 msec. , A dye receiving layer was transferred over the entire surface under the condition of a dot density of 3 dots / mm, and then a yellow signal obtained by color-separating an original was printed on the surface of the dye 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, the cyan dye was transferred by the same cyan signal to form a full-color image, and the protective layer was transferred to the image surface. All produced beautiful, high-quality full-color images.

[0025]

[Effects] According to the present invention as described above, the transferable dye receiving layer is formed on the substrate film via the release layer by making the release layer provided on the substrate film distinguishable from the substrate film. When provided, a dye receiving layer transfer sheet and a composite thermal transfer sheet can be provided in which each of these laminated layers are in good matching alignment.

[Brief description of drawings]

FIG. 1 is a diagram schematically illustrating a cross section of a dye-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: Release layer 3: Dye receiving layer 4: Adhesive layer 5: Dye layer 6: Protective layer 7: Intermediate layer 8: Heat resistant slipping layer

Claims (6)

[Claims] 1. A transferable dye receiving layer which is peelable via a release layer on one surface of a long base film, wherein the release layer is distinguishable from the base film. Characteristic dye-receiving layer transfer sheet. 2. The dye-receiving layer transfer sheet according to claim 1, wherein the release layer contains an ultraviolet absorber, a fluorescent whitening agent, a non-sublimable dye or a pigment. 3. A continuous base film, wherein a dye layer of one color or a plurality of colors and a transferable dye receiving layer which can be peeled off are sequentially formed on one surface of the long base film, and the release layer is a base film. A composite thermal transfer sheet characterized by being identifiable as 4. The composite thermal transfer sheet according to claim 3, wherein the release layer contains an ultraviolet absorber, a fluorescent brightening agent, a non-sublimable dye or a pigment. 5. The composite thermal transfer sheet according to claim 3, further comprising a transferable protective layer provided in a frame sequential manner. 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 composite thermal transfer sheet according to claim 3, which contains a seed.