JPH05155165A - Receiving layer transfer sheet, composite thermal transfer sheet and image forming method - Google Patents

Abstract

PURPOSE:To form a high density image of high quality free from missing dots even to rough paper having no smooth surface with good heat energy efficiency. CONSTITUTION:A receiving layer transfer sheet is obtained by providing a transfer resin layer A containing at least a dye receiving layer 3 to one surface of a base film 1. The transfer resin layer A contains hollow capsules with a volume hollow ratio of 50% or more and a heat-sensitive adhesive layer 4 is formed to the uppermost layer. Further, a dye layer of one color or a plurality of colors, a transfer dye receiving layer 3 and/or a transfer protective layer are successively provided to one surface of a long base film and the transfer receiving layer 3 contains hollow capsules with a volume hollow ratio of 50% or more.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a receptive layer transfer sheet for transferring a receptive layer to a material to be transferred by a thermal head, a composite thermal transfer sheet containing the receptive layer, and an image forming method. Relates to a composite thermal transfer sheet capable of forming a color image and a method for forming an image.

[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.

However, the material to be transferred capable of forming an image by the above method is limited to a dye-dyeable plastic sheet or a paper on which a dye-receptive layer is provided in advance. There is a problem that can not be formed. Of course, even ordinary plain paper can be image-formed by forming a receptive layer on the surface thereof, but this is generally costly. For example, postcards, memos, notepapers, and reports. It is difficult to apply to general off-the-shelf transfer materials such as paper. As a method of solving such a problem, when an image is to be formed on a ready-to-be-transferred material such as plain paper, as a method of easily forming a dye receiving layer only on a necessary portion thereof, a receiving layer transfer sheet Is known (for example,
(See JP-A-62-264994). Further, as a method of simplifying the operation, each dye layer of yellow, cyan, magenta and, if necessary, black is formed on the surface of the long base film in a surface sequential manner, and a transfer receiving layer is further formed on the same base film. There is known a composite thermal transfer sheet which forms a full-color image by first transferring a receiving layer to an image receiving sheet, and then transferring dyes of respective colors to the receiving layer, and further, protection for protecting the formed dye image. A composite thermal transfer sheet having layers further provided in a frame-sequential manner has also been proposed.

[0004]

[Problems to be solved by the invention] However,
When using the receptor layer transfer sheet as described above, there are few problems in the case of processed paper having a smooth surface, but in the case of rough plain paper, postcards and other paper, fibers are exposed on the surface and Due to lack of smoothness, transfer of the receiving layer is not performed uniformly,
Therefore, there is a problem in that white spots and defects occur in the image formed on the receiving layer, and a high quality image cannot be obtained. As a method for solving these problems, it is conceivable to form a receptive layer thickly and transfer it. In this case,
The transferability and foil breakability of the receiving layer are inferior, and because the receiving layer is relatively hard, sufficient cushioning properties cannot be obtained and heat transfer from the thermal head through the thermal transfer sheet becomes uneven. Similarly, there is a problem that a high quality image cannot be obtained. Further, there is a problem that the heat transferred to the receiving layer is easily diffused and the energy efficiency of the thermal head is low.
Therefore, an object of the present invention is to solve the above-mentioned problems of the prior art, and to form a high-quality and high-density image without white spots or defects even on rough paper whose surface is not smooth with good thermal energy efficiency. It is an object of the present invention to provide a receptive layer transfer sheet, a composite thermal transfer sheet, and an image forming method that enable the above.

[0005]

The above object can be achieved by the present invention described below. That is, the present invention provides a receptor layer transfer sheet in which a transferable resin layer containing at least a dye-receptive layer is provided on one surface of a substrate film, wherein the transferable resin layer has a volume hollowness of 50% or more. A receptive layer transfer sheet comprising a hollow capsule and having a heat-sensitive adhesive layer formed on the uppermost layer, a dye layer of one or more colors and a transferable dye receptor on one surface of a long base film. A layer and / or a transferable protective layer are provided in a face-sequential manner, and the transferable receiving layer contains a hollow capsule having a volume hollowness of 50% or more, and a composite heat transfer sheet is used. This is an image forming method.

[0006]

By including a hollow capsule having a volume hollowness of 50% or more in the transfer resin layer including at least the dye receiving layer, it is possible to provide the transferred dye receiving layer with good cushioning property and heat insulating property. As a result, it is possible to form a high-quality and high-density image without white spots or defects with good thermal energy efficiency.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in more detail with reference to the following preferred embodiments. One example of the receptor layer transfer sheet of the present invention is a receptor layer transfer in which a transferable resin layer A containing at least a dye receptor layer 3 is provided on one surface of a substrate film 1 as schematically shown in FIG. In the sheet, the transferable resin layer A is characterized in that it contains hollow capsules having a volume hollowness of 50% or more, and the uppermost layer is the heat-sensitive adhesive layer 4. The composite thermal transfer sheet of the present invention has one or more dye layers 5, for example, yellow (5
Y), magenta (5M), cyan (5C) and optionally black (Bk) (not shown) and the transferable resin layer A and / or transferable protective layer 5 containing the same dye receiving layer as in FIG.
Are provided in a frame sequential manner. still,
In the figure, 6 is a back surface slipping layer.

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 and heat resistance thereof are appropriate, but the thickness is
It is preferably 3 to 100 μm.

In the embodiment of the present invention shown in FIG. 1, a transferable resin layer A containing the same dye receiving layer 3 as described below is formed substantially entirely on the substrate film as described above. To do.
In the case where the present invention is the embodiment shown in FIG. 2, the dye layer 5 and the transferable receiving layer and / or the transferable protective layer B are formed in the surface order on the surface of the continuous body of the substrate film as described above. To do. The dye layer% is a layer in which a 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 MS Red G, Macrolex R as red dyes.
edViolet R, Ceres Red7B, SamaronRed HBSL, Resolin R
edF3BS and the like, and, as the yellow dye, Holon Brilliant Yellow 6GL, PTY-52, Macrolex Yellow 6G and the like, and as the blue dye, Kayaset Blue 714, Waxolin Blue AP-FW. , Holon Brilliant Blue SR, MS Blue 100, etc.

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 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, 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 receiving layer is provided on the dye layer in a frame-sequential manner. The relationship with the dye layer is not particularly limited, but for example, as shown in FIG.
The order of Y → M → C → Bk → protective layer is generally, but not limited to this. When the dyes of the respective hues are usually provided in the same area, the receiving layer is required to be transferred twice or more depending on the type of the material to be transferred and the durability required for the image. Therefore, it can be formed in a larger area.

Prior to the formation of the receiving layer, it is preferable to form the release layer 2 on the surface of the base film. Such a release layer includes waxes, silicone wax, silicone resin,
It is formed from a release agent such as fluororesin or acrylic resin. The forming method may be the same as the forming method of the receiving layer, and the thickness thereof is 0.
About 5 to 5 μm is sufficient. 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. Of course, it is not necessary to form the release layer when the base film as described above has an appropriate releasability. The transferable resin layer A formed on the surface of the base film and containing at least the dye receiving layer 3 may be a receiving layer alone, but as shown in FIG. 1, other intermediate layers or barrier layers (hereinafter simply referred to as intermediate layers). 7) and / or a heat-sensitive adhesive layer 4.
It is sufficient that at least one of these layers contains a hollow capsule having a volume hollow ratio of 50% or more.

The above-mentioned dye receiving layer 3 is for receiving the sublimable dye transferred from the thermal transfer sheet after the receiving layer is transferred onto an arbitrary transfer material, and for maintaining the formed image. Examples of the resin for forming the dye receiving layer include polyolefin resins such as polypropylene, halogenated polymers such as polyvinyl chloride and polyvinylidene chloride, vinyl polymers such as polyvinyl acetate and polyacrylic ester, polyethylene terephthalate and poly Polyester resins such as butylene terephthalate, polystyrene resins, polyamide resins, copolymer resins of olefins such as ethylene and propylene with other vinyl monomers,
Examples thereof include ionomers, cellulosic resins such as cellulose diacetate, polycarbonates, and the like, and particularly preferable are vinyl resins and polyester 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. As the silicone oil, a modified silicone oil such as epoxy modified, alkyl modified, amino modified, carboxyl modified, alcohol modified, fluorine modified, alkylaralkyl polyether modified, epoxy / polyether modified, polyether modified is desirable. As the release agent, one type or two or more types are used. or,
The amount of the releasing 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 a resin such as the above with necessary additives such as a releasing agent, in a suitable organic solvent or an organic solvent. It is formed by applying and drying the dispersion dispersed in water or water by a forming means such as a gravure printing method, a screen printing method, and a reverse roll coating method using a gravure plate. When forming the dye receiving layer, a filler such as kaolin clay, calcium carbonate, fine powder silica or the like may be added for the purpose of improving foil breakage of the receiving layer. 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. Of course, it is also possible to include a hollow capsule in this intermediate layer.

Further, an intermediate layer 7 is formed on the surface of the above-mentioned receiving layer 3 if necessary. When the above-mentioned hollow capsule is contained in the adhesive layer 4, the intermediate layer 7 prevents occurrence of irregularities on the surface of the receiving layer 3 due to the hollow capsule after transferring the receiving layer 3 and damage to the receiving layer due to rupture of the hollow capsule. Acting,
In addition, the release agent added to the receiving layer has a function of preventing the release agent from migrating to the adhesive layer 4 and deteriorating the adhesiveness of the adhesive layer, which is relatively hard resin and rich in elasticity. It is preferably formed from a resin. Such an intermediate layer may be omitted, or an adhesive layer may be provided on the surface of the receiving layer without providing the intermediate layer. The intermediate layer 7 includes, for example, polyamide resin, acrylic resin, vinyl chloride resin, ethylene / vinyl acetate copolymer resin, vinyl chloride / vinyl acetate copolymer resin,
By coating and drying a solution of a resin having a good coating property such as polyester resin, preferably 0.1 to 5
It is formed to a thickness of about μm. Further, at least a part of the above resin may be crosslinked, or its strength may be improved such as electron beam curing or ultraviolet curing resin. Of course, it is also possible to include a hollow capsule in this intermediate layer. The adhesive layer 4 that may be formed on the intermediate layer 7 includes, for example, polyamide resin, epoxy resin, acrylic resin,
Vinyl chloride resin, vinyl chloride / vinyl acetate copolymer resin,
By coating and drying a solution of a resin having a good adhesive property when heated, such as a polyester resin, preferably 0.5
It is formed to a thickness of about 10 μm.

The hollow capsules contained in at least one of the dye receiving layer 3, the intermediate layer 7 and the adhesive layer 4 as described above are, for example, low boiling point liquids such as butane and pentane, resins such as polyvinylidene chloride and polyacrylonitrile. A well-known foaming agent such as a microballoon microcapsulated in 1. is foamed, and a microballoon coated with a white pigment can also be effectively used. Particularly preferred foaming agents are the above microballoons capable of foaming treatment at a relatively low temperature, the foams thereof, and the microballoons coated with a white pigment, such as Matsumoto Yushi-Seiyaku Co., Ltd.
Of various grades are available from the manufacturer and any of them can be used in the present invention. These foaming agents are added to the transferable resin layer in an unfoamed state, and finally, that is,
It suffices that the thermal transfer image-receiving sheet is foamed to form a hollow capsule, or may be added to the resin layer in a foamed state in advance. It is also effective to mix the foaming agent in the resin layer in an unfoamed state, leave it unfoamed without heat treatment, and heat foam it with the heat of the thermal head during image formation to encapsulate it. The volume hollowness of the hollow capsule needs to be 50% or more, and if the volume hollowness is less than 50%, sufficient cushioning properties and heat insulating properties cannot be obtained. The most preferable result is obtained when the volume hollow ratio is 90% or more, for example, 90 to 99.0%. The particle size of these hollow capsules is preferably 0.2 to 20 μm, and if the particle size is less than 0.2 μm, the cushioning property and heat insulating property are similarly insufficient, while if it exceeds 20 μm, a smooth coating film is obtained. Is difficult to obtain, which is not preferable in image formation.
Further, the thickness of the partition wall of the hollow capsule is preferably in the range of 0.05 to 3 μm. If it is too thin, the capsule is easily broken at the time of production or image formation, while if it is too thick, the cushioning property becomes poor.

The hollow capsules are preferably included in the adhesive layer for the above-mentioned reasons. When the hollow capsules are included in the adhesive layer, the Tg of the adhesive is -20 to +7.
The temperature is preferably 0 ° C. By using such an adhesive, the cushioning property of the hollow capsule can be fully utilized. The thickness of the layer containing the hollow capsule is 3 to 30.
If it is too thin, sufficient cushioning properties and heat insulating properties cannot be obtained. On the other hand, if it is too thick, the surface of the receiving layer is likely to be scratched, which causes a decrease in transferability and defective printing. Also, the hollow ratio of the layer containing the hollow capsules is 10 to 90%.
If it is less than 10%, sufficient cushioning properties and heat insulating properties cannot be obtained, while if it exceeds 90%, the strength of the layer becomes unsatisfactory. Further, in the present invention, by containing a filler, a white pigment, a fluorescent whitening agent and the like in at least one of the above layers, a receiving layer having excellent whiteness is provided regardless of the background color of the material to be transferred. You can The above-mentioned receptor layer transfer sheet of the present invention also includes an embodiment in which the layer containing hollow capsules comprises a resin, hollow capsules and cavities. Here, the term “cavity” means, for example, a minute cell generated by a decomposing type foaming agent, and the coexistence of the hollow capsule and the cavity can further enhance the cushioning property. However, if the ratio of cavities is too large, the film strength will decrease, so it is desirable to appropriately adjust the ratio of hollow capsules to cavities.

In the present invention, if necessary, a transparent or semitransparent transferable protective layer B is formed on the dye layer and the transferable receiving layer in a frame order. Examples of the resin for forming the protective layer B include polyolefin resins such as polypropylene, polyvinyl chloride, vinyl chloride / vinyl acetate copolymer, halogenated polymers such as polyvinylidene chloride, polyvinyl acetate, and polyacrylic ester. Such as vinyl polymers, polyethylene terephthalate, polyester resins such as polybutylene terephthalate, polystyrene resins, polyamide resins, copolymer resins of olefins such as ethylene and propylene with other vinyl monomers, ionomers, cellulose diacetate, etc. Cellulose resins, polycarbonates and the like can be mentioned, and particularly preferable ones are vinyl resins and polyester resins.

Further, an adhesive layer is preferably provided on the surface of the above-mentioned protective layer in order to improve the transferability of these layers. These adhesive layers are, for example, polyamide resin,
By coating and drying a solution of a resin having good adhesiveness under heat such as acrylic resin, vinyl chloride resin, vinyl chloride / vinyl acetate copolymer resin, polyester resin, etc., the thickness is preferably about 0.5 to 10 μm. Form. still,
In the case of a transferable protective layer, bubbles and an intermediate layer are unnecessary.
The method for forming the layer may be the same as that for forming the transferable receiving layer. The image-receiving sheet for transferring the receptor layer and forming an image using the receptor-layer transfer sheet as described above is not particularly limited, and examples thereof include plain paper, high-quality paper, tracing paper, and plastic film. It may be a sheet, and in terms of shape, it may be any of cards, postcards, passports, letter papers, report papers, notebooks, catalogs, etc., and is particularly applicable to plain papers having rough surfaces and rough papers. 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 the like, which can be heated to a temperature at which the receptor layer or the adhesive layer is activated. The heating and pressurizing means may be used. Any conventionally known means can be used as an image forming method. 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.), 5 By applying thermal energy of about 100 mJ / mm ² , the intended purpose can be sufficiently achieved.

[0021]

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. Example 1 A release-treated surface of a polyethylene terephthalate film (manufactured by Toray) having a thickness of 4.5 μm and having a heat resistant slipping layer formed on the back surface and another surface subjected to release processing, has a width of 30 cm and an interval of 90 c.
m, the receiving layer, the intermediate layer, and the adhesive layer were overlaid. The receptive layer is formed by applying a receptive layer 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 intermediate layer was similarly formed by applying and drying the following coating liquid at a rate of 1.0 g / m ² when dried.
The adhesive layer was similarly formed by applying and drying the following adhesive solution at a dry rate of 3.0 g / m ² . The hollow rate of this adhesive layer was 21%.

Composition of Receptor Layer Coating Liquid Vinyl chloride / vinyl acetate copolymer resin (manufactured by Denki Kagaku Kogyo, 1000GKT) 100 parts Amino-modified silicone (X-22-343, Shin-Etsu Chemical Co., Ltd.) 3 parts Epoxy-modified silicone (KF -393, Shin-Etsu Chemical Co., Ltd. 3 parts Methyl ethyl ketone / toluene (weight ratio 1/1) 500 parts Coating composition for intermediate layer ; Polymethylmethacrylate resin (BR-106, Mitsubishi Rayon) 100 parts Methyl ethyl ketone / toluene (weight) Ratio 1/1) 500 parts Adhesive layer coating liquid composition ; Polymethylmethacrylate resin (BR-106, made by Mitsubishi Rayon) 100 parts Hollow capsule (SX863 (A), made by Japan Synthetic Rubber, capsule hollow ratio 70%, Particle size 0.4 μm, partition wall thickness 0.13 μm) 10 parts Titanium oxide (TCA-888, manufactured by Tochem Products) 100 parts Methyl Ethyl ketone / toluene (weight ratio 1/1) 500 parts Subsequently, an ink for the dye layer having the following composition was prepared, and a dry coating amount of 1.0 g / each was applied to the surface of the base film on which the receiving layer was not formed. The composite thermal transfer sheet of the present invention was obtained by applying a gravure coater so as to obtain m ² and then drying.

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 thermal transfer sheet was replaced with a yellow disperse dye (Macrolex Yellow 6G, Bayer, CIDisper).
se Yellow 201), and a magenta thermal transfer sheet was formed using a magenta disperse dye (CIDisperse Red 60). Example 2 In place of the foaming agent in Example 1, 15 parts of microcapsules (F-30D manufactured by Matsumoto Yushi-Seiyaku Co., Ltd.) were used, and the coating liquid for the adhesive layer was applied in the same manner as in Example 1. And then 1
It was dried by heating and foaming at 20 ° C. for 2 minutes to form a receptor layer transfer sheet of the present invention. The hollow capsule in this adhesive layer has a hollow ratio of 99%, a particle diameter of 25 μm, and a partition wall thickness of 0.1 μm.
The thickness of the adhesive layer after foaming was 35 μm, and the hollow ratio of the adhesive layer was 70%. Example 3 Instead of the foaming agent in Example 1, titanium-coated microcapsules (Matsumoto Yushi-Seiyaku Co., Ltd., F-30D /
15 parts by weight of TiO ₂ ) was added, and otherwise the same as in Example 1 to form a receptor layer transfer sheet of the present invention.

Example 3 The same procedure as in Example 1 was carried out except that a transferable protective layer was further formed in a face-sequential manner from a 20% methyl ethyl ketone solution of an acrylic resin (BR-85, manufactured by Mitsubishi Rayon) in Example 1. The receiving layer transfer sheet of the invention was obtained. Comparative Example 1 The procedure of Example 1 was repeated except that no bubbles were included in Example 1. Example 4 The receiving layer surface and the postcard of the composite thermal transfer sheets of Examples 1 to 3 and Comparative Example 1 described above were superposed, and a thermal head was used to output 1 W / dot and pulse width 0.3 to 0.45 mse.
c., the receiving layer is transferred over the entire surface under the condition of a dot density of 3 dots / mm, and subsequently, 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 transferred to the image area obtained above by a magenta signal, and a cyan dye is further transferred by a similar cyan signal to form a full-color image, and a protective layer (Example 3) is further transferred to the image surface. It was In the case of the present invention, the image quality of the obtained image was a high-quality image without white spots or chips, but when the composite thermal transfer sheet of the comparative example was used, it was an image with many white spots or chips. It was

[0025]

According to the present invention as described above, the transfer resin layer containing at least the dye receiving layer contains a hollow capsule having a volume hollowness of 50% or more, so that the transferred dye receiving layer has good cushioning properties. And a heat insulating property can be provided, and as a result, it is possible to form a high-quality and high-density image without white spots and defects with good thermal energy efficiency.

[0026]

[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.

[Explanation of symbols]

 1: Base film 2: Release layer 3: Dye receiving layer 4: Adhesive layer 5: Dye layer 6: Heat resistant slipping layer 7: Intermediate layer A: Transferable resin layer including dye receiving layer B: Transferable protective layer

Claims (12)

[Claims] 1. A receptor layer transfer sheet comprising a base film and a transfer resin layer containing at least a dye receiving layer on one surface of the base film, wherein the transfer resin layer has a volume hollowness of 50.
% Of the hollow capsules and a heat-sensitive adhesive layer is formed on the uppermost layer of the receptive layer transfer sheet. 2. A long base film is provided with a dye layer of one color or a plurality of colors and a transferable dye receiving layer and / or a transferable protective layer on one surface of the long base film in a surface-sequential manner. A composite thermal transfer sheet comprising a hollow capsule having a volume hollow ratio of 50% or more. 3. The receptor layer transfer sheet according to claim 1, wherein the hollow capsule has a volume hollow ratio of 90% or more. 4. A hollow capsule having a particle size of 0.2 to 20 μm.
The receptive layer transfer sheet according to claim 1 or 2. 5. The thickness of the partition wall of the hollow capsule is 0.05 to
The receiving layer transfer sheet according to claim 1, which has a thickness of 3 μm. 6. The Tg of the resin in the layer containing the hollow capsules is −
The receiving layer transfer sheet according to claim 1, which has a temperature of 20 to + 70 ° C. or lower. 7. The layer containing a hollow capsule has a thickness of 3 to 30.
The receiving layer transfer sheet according to claim 1, which has a thickness of μm. 8. The hollow ratio of the layer containing hollow capsules is 10 to 10.
It is 90%, The receptor layer transfer sheet of Claims 1-2. 9. The receptor layer transfer sheet according to claim 1, wherein the layer containing hollow capsules comprises a resin, capsules and cavities. 10. The composite thermal transfer sheet according to claim 1, wherein the transferable receiving layer is white and the transferable protective layer is transparent or translucent. 11. The transferable receiving layer comprises an intermediate layer, and at least one of these layers contains at least one selected from the group consisting of white pigments, optical brighteners and bubbles. 2. The composite thermal transfer sheet according to 2. 12. An image forming method comprising using the thermal transfer sheet according to claim 1 or 2, and successively transferring a receiving layer, a dye image and, if necessary, a protective layer to a material to be transferred.