JPH11139014A - Thermal transfer image receiving sheet and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thermal transfer image receiving sheet for preventing occurrence of a clogging at the time of discharging in a printer or of a curl after an image is formed. SOLUTION: In the thermal transfer image receiving sheet 1 comprising a sealing portion 2 having at least a receptive layer 4, a sealing base material 5 and an adhesive layer 8 sequentially laminated in this order, and a releasing portion 3 having a release layer 9, a sheet base material 10 and a rear surface layer 11 in such a manner that the layer 8 and the layer 9 are releasably laminated; as the material 5, a plastic film 6 having microscopic voids in the base material is used, and a support 7 is laminated at the layer 8 side of the film 6. Thus, a contraction at a heated surface side of the film 6 is stopped by heating at the time of forming an image, and a curl of the sheet 1 is eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming an image by thermal transfer, comprising a seal portion comprising at least a receiving layer, a base material and an adhesive layer, and a release portion comprising a release layer, a paper base material and a back surface layer. In the thermal transfer image receiving sheet in which the pressure-sensitive adhesive layer and the release layer are releasably bonded, the thermal transfer image receiving sheet is prevented from being curled, has excellent transportability in a printer, and provides a high-density, high-resolution image. It is about.

[0002]

2. Description of the Related Art Conventionally, various thermal transfer methods are known. In this method, a thermal transfer sheet having a colored transfer layer formed on a base sheet is heated in an image form from the back side by a thermal head or the like. Then, the colored transfer layer is thermally transferred to the surface of the thermal transfer image receiving sheet to form an image. This thermal transfer method is roughly classified into two types, a sublimation transfer type and a hot-melt transfer type, depending on the configuration of the colored transfer layer.
Both types are capable of forming full-color images.For example, a yellow, magenta, cyan, or, if necessary, a black or three-color thermal transfer sheet is prepared, and each color is formed on the surface of the same thermal transfer image-receiving sheet. The full-color image is formed by superimposing and thermally transferring images.
Due to the development of various hardware and software related to multimedia, this thermal transfer method has been developed as a full color hard copy system for computer graphics, satellite communication still images and analog images such as digital images and videos represented by CDROM and others. Its market is expanding.

The specific application of the thermal transfer image-receiving sheet by this thermal transfer method is wide-ranging. Typical examples are print proofs, image output, CAD / CAM
Design and output of design, etc., various medical analysis equipment such as CT scan and endoscope camera, output use of measurement equipment and as an alternative to instant photography, as well as identification cards, ID cards, credit cards, other cards Output such as face photos to amusement parks, game centers, museums, aquariums, and other amusement facilities, such as composite photos, commemorative photos, picture postcards, and other uses such as message cards, calendars, system notebooks, etc. . Furthermore, with the diversification of applications as described above,
The receiving layer 4 and the sealing substrate 5 on which an image 12 is formed as shown in FIG.
However, the thermal transfer image receiving sheet 1 having a configuration capable of being peeled off from the peeling section 3 via the adhesive layer 8 is used. This is a so-called label or seal type. After forming a desired image 12 on the receiving layer 4, the thermal transfer image-receiving sheet 1 peels off the sealing portion 2 composed of the receiving layer 4, the sealing base material 5, and the adhesive layer 8 in this order from the peeling portion 3. It is used for sticking to any object.

FIG. 2 shows an example of a thermal transfer image receiving sheet used for the above-mentioned applications. In the thermal transfer image receiving sheet, a thermal transfer sheet (not shown) is superimposed on its surface, and the thermal transfer sheet is heated imagewise from the back side by a thermal head or the like, so that the colored transfer layer of the thermal transfer sheet becomes the receiving layer of the thermal transfer image receiving sheet. The image is transferred and an arbitrary image 12 is formed on the surface of the thermal transfer image receiving sheet. The formed image 12, for example, a face photograph image, is printed on the adhesive layer 8.
Is peeled off from the peeling section 3 together with the sealing section 2
Is attached to an arbitrary article 13, for example, a notebook, a notebook, a bag, and other articles as shown in FIG. In the seal-type thermal transfer image-receiving sheet as described above, there are many applications in which a seal substrate is used as a plastic film. On the other hand, in order to ensure high-density and high-resolution image quality, a plastic film having microvoids inside a substrate is preferably used as a plastic film because of its excellent cushioning property and heat insulating property.

[0005]

However, when a plastic film having microvoids therein is used as the above-mentioned sealing substrate, shrinkage occurs on the heated side of the plastic film due to heating during image formation. As a result, the thermal transfer image-receiving sheet is curled, causing clogging at the time of discharge by a printer, or the obtained image-formed product is curled, thereby deteriorating the commercial value.

Therefore, in order to solve the above problem,
The present invention comprises a seal portion in which at least a receiving layer, a seal base material, and an adhesive layer are laminated in this order, and a release portion composed of a release layer, a paper base material, and a back surface layer. This is a thermal transfer image-receiving sheet with a mold layer peelably bonded, using a plastic film with microvoids inside the base material as a sealing base material, which may cause clogging when discharged by a printer or curl after image formation. It is an object of the present invention to provide a thermal transfer image receiving sheet in which the occurrence of the image is prevented.

[0007]

Means for Solving the Problems To achieve the above object, the present invention relates to a sealing portion in which at least a receiving layer, a sealing substrate, and an adhesive layer are laminated in this order, a release layer, a paper substrate,
In a thermal transfer image-receiving sheet comprising a release portion composed of a back layer and the adhesive layer and the release layer being releasably bonded, a plastic film having microvoids inside the substrate is used as the seal substrate. A support is laminated on the pressure-sensitive adhesive layer side of the plastic film. Further, it is preferable that the sealing base material is a polypropylene film having microvoids inside the base material. Further, the support preferably has a shrinkage ratio of 0 to 0.5% after being left at 110 ° C. for 60 seconds.

Further, it is preferable that the release layer and the back surface layer of the peeling section are formed by extrusion coating on a paper base material. Further, it is preferable that the thickness of the release layer and the back surface layer of the peeled portion is larger in the back layer than in the release layer.
Further, it is preferable that the receiving layer has a shape wound so that the surface of the receiving layer is outside the roll. Providing a receiving layer on the plastic film side of a sealing substrate in which a plastic film having a microvoid inside the substrate and a support are laminated,
Release layer, paper substrate, a peeling portion consisting of a back layer, forming an adhesive layer on the release layer, or forming an adhesive layer on the support of the seal substrate, a support, In a method of manufacturing a thermal transfer image-receiving sheet by laminating an adhesive layer and a release layer in the order of lamination, the tension at the time of laminating the release portion side is higher than the tension at the time of laminating the seal base material. Is also large.

[0009]

The present invention comprises a seal portion in which at least a receiving layer, a seal base material and a pressure-sensitive adhesive layer are laminated in this order, and a release portion composed of a release layer, a paper base material and a back surface layer. In the thermal transfer image receiving sheet in which the release layer and the release layer are stuck releasably, a plastic film having microvoids inside the substrate is used as the sealing substrate, and a support is provided on the pressure-sensitive adhesive layer side of the plastic film. Since the laminated structure is adopted, the support prevents the shrinkage from occurring on the heated surface side of the plastic film due to heating during image formation, so that the thermal transfer image receiving sheet does not curl. In particular, when a polypropylene film having microvoids inside the base material is used as the sealing base material, the polypropylene film is likely to be concavely curled toward the receiving layer (FIG. 4B), and the support stops the curl. By setting the thickness of the release layer and the back surface layer in the release portion of the thermal transfer image-receiving sheet to be greater than that of the release layer in the back layer, the paper base of the release portion has a thicker back layer side. To make the peeled portion curl convexly toward the release layer (FIG. 4).
(C)) The curl of the entire thermal transfer image-receiving sheet is more reliably prevented.

In the thermal transfer image-receiving sheet, a curl is formed so that the surface of the receiving layer is on the outside of the roll, so that the curling after the image formation is made convex (FIG. 4A). This can be more reliably prevented from occurring. Further, a receiving layer is provided on the plastic film side of a seal base material in which a plastic film having a microvoid inside the base material and a support are laminated, and a release part comprising a release layer, a paper base material, and a back surface layer; Forming a pressure-sensitive adhesive layer on the layer, or forming a pressure-sensitive adhesive layer on a support of the sealing base material, and laminating the support, the pressure-sensitive adhesive layer, and the release layer so as to be laminated in this order, and receiving the heat transfer image. In the method for producing a sheet, the tension at the time of laminating the peeled portion side is made larger than the tension at the time of laminating the seal base material, so that the concave curl is formed on the peeled portion side having a large tension, that is, the receiving layer. By forming a convex curl on the side (FIG. 4A), the occurrence of curl after image formation can be more reliably prevented.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail with reference to preferred embodiments. FIG. 1 is a sectional view showing one embodiment of the thermal transfer image receiving sheet of the present invention. A receiving part 4, a sealing base 5 comprising a plastic film 6 having a microvoid inside the base and a support 7, a sealing part 2 in which an adhesive layer 8 is laminated in this order, a release layer 9, a paper base 10, The thermal transfer image-receiving sheet 1 is composed of the peeling portion 3 in which the back surface layer 11 is laminated in this order, and the pressure-sensitive adhesive layer 8 and the release layer 9 are releasably bonded.

(Peeling part) In the peeling part 3 used in the present invention, a release layer 9 is formed on one surface of a paper substrate 10 and a back surface layer 11 is formed on the other surface of the paper substrate 10. Things. The paper base material 10 includes, for example, high quality paper, art paper, lightweight coated paper, lightly coated paper, coated paper, cast coated paper, synthetic resin or emulsion impregnated paper, synthetic rubber latex impregnated paper, synthetic resin internal paper, and the like. No. Among them, inexpensive coated paper is preferably used. The thickness of the paper substrate 10 is about 10 to 200 μm.

The release layer 3 can be formed by applying a silicone-based release agent or a wax-based release agent onto the paper base material 10, or by extrusion-coating a polyethylene resin or the like. In order to form the release layer 3 in a uniform thin film, extrusion coating of a polyethylene resin is preferably performed in the present invention. The density of the polyethylene resin used is preferably 0.935 g / m ³ or more, and its thickness is about 5 to 30 μm. Further, it is preferable to apply a silicone-based release agent or a wax-based release agent on the outermost surface of the release layer in order to improve the releasability from the pressure-sensitive adhesive layer.

The back surface layer 11 provided on the other surface of the paper substrate 10 is formed for improving the printer transportability and controlling the curl of the peeled portion. Then, it can be formed by coating or by extrusion coating of a polypropylene resin or the like. In order to uniformly form the back surface layer 11 as a thin film, extrusion coating of a polypropylene resin is preferably performed in the present invention. By making the thickness of the back surface layer larger than that of the release layer, the peeled portion is formed into a convex curl toward the release layer side as shown in FIG. This has a function of canceling out points that are likely to be concavely curled (see FIG. 4B), which is preferable. Specifically, the thickness of the back layer is 1
It is about 0 to 50 μm. As described above, in the peeling portion of the thermal transfer image receiving sheet, the thickness of the release layer and the back surface layer is larger in the back layer than in the release layer. It is possible to more reliably prevent the curl from being generated on the thermal transfer image-receiving sheet after image formation, by shrinking on the layer side and making the peeling portion convex curl toward the release layer side.

(Pressure-Sensitive Adhesive Layer) The pressure-sensitive adhesive layer 8 used in the present invention can be formed using any conventionally known solvent-based or water-based pressure-sensitive adhesive. As an adhesive,
For example, vinyl acetate resin, acrylic resin, vinyl acetate
Acrylic copolymer, vinyl acetate-vinyl chloride copolymer,
Ethylene-vinyl acetate copolymer, polyurethane resin,
Examples include natural rubber, chloroprene rubber, nitrile rubber, and the like. The coating amount of the adhesive layer 8 is about 8 to 30 g / m ^2.
(Solid content) is generally used, and is applied on a release layer of a paper base material by a conventionally known method, that is, a method such as gravure coating, gravure reverse coating, or roll coating, and is dried to obtain an adhesive layer 8. To form The adhesive strength of the pressure-sensitive adhesive layer 8 is represented by the peel strength between the release layer 3 and the pressure-sensitive adhesive layer 6, which is JISZ0.
In the peeling method at 180 ° according to 237, 100
~ 1,700 g, preferably 700-1,400
g. The kind and coating amount of the pressure-sensitive adhesive as described above are determined by the pressure-sensitive adhesive layer 8 on the release layer of the release substrate.
It is preferable to select and use such that the peeling strength is in the above range when forming.

(Seal Substrate) The seal substrate 5 in the thermal transfer image-receiving sheet of the present invention is a laminate of a plastic film 6 having microvoids inside the substrate and a support 7. The sealing base material has a cushioning property, a heat insulating property, a plastic film having microvoids inside the base material is used on the receiving layer side in order to secure high density and high resolution image quality, and the adhesive of the plastic film is used. On the layer side, a support is laminated, and heating during image formation prevents shrinkage from occurring on the heated surface side of the plastic film, and the support prevents the curl of the thermal transfer image receiving sheet. is there.

The sealing substrate can be formed by applying a coating liquid having a layer having microvoids thereon onto a support, and a plastic film having microvoids can be formed in advance by a biaxial stretching method. It is preferable to form a film by preparing the film by laminating the plastic film on a support, or to form a plastic film having microvoids on the support by extrusion coating.

The plastic film 6 having microvoids is mainly composed of polyolefin, especially polypropylene, blended with an inorganic pigment and / or a polymer incompatible with polypropylene, and is used as a foaming initiator. Then, a formed plastic film is used. Also, plastic films having microvoids are usually formed by biaxial stretching,
It has cushioning properties and heat shrinkability. The heat shrinkability of a plastic film having such microvoids is as follows.
Specifically, at 110 ° C. for 60 seconds, 0.5 to 2.5
% Shrinkage.

Next, the support 7 is preferably one having better thermal stability such as heat shrinkage than a plastic film having microvoids, and more specifically, coated paper, art paper, glassine paper, high quality paper. And cast-coated paper, other papers mainly composed of cellulose fibers, PET films, PET films having microvoids inside the support, white PET films, acrylic films and the like. The heat shrinkage of such a support is 6 at 110 ° C.
It is about 0-0.5% when left for 0 seconds, lower than the thermal shrinkage of a plastic film having microvoids, and has excellent thermal stability.

The method of laminating the plastic film having microvoids and the support may be, for example, dry lamination, non-solvent (hot melt).
Lamination, EC lamination, known lamination methods such as extrusion coating method can be used,
Preferred methods are dry lamination and non-solvent lamination methods. Examples of the adhesive suitable for the non-solvent lamination method include Takenate A-720L manufactured by Takeda Pharmaceutical Co., Ltd.
Examples of an adhesive suitable for dry lamination include Takelac A969 / Takenate A-5 (3/1) manufactured by Takeda Pharmaceutical Co., Ltd. The amount of these adhesives, from about 1-8 g / m ² on a solids, and preferably from 2 to 6 g / m ^2.

(Receiving Layer) The receiving layer 4 formed on the sealing substrate can be formed directly on the sealing substrate or via a primer layer. The receiving layer 4
The configuration of the receiving layer is different due to the difference between each recording method of the heat melting transfer recording and the sublimation transfer recording. Further, in the thermal fusion transfer recording, the colored transfer layer can be thermally transferred directly from the thermal transfer sheet to the sealing base material without providing the receiving layer. The receiving layer of the heat-melt transfer recording and the sublimation transfer recording has a function of receiving a color material transferred from the heat transfer sheet by heating, and particularly, in the case of a sublimable dye, receives the colorant and simultaneously develops the color. It is desired that the dye once received is not resublimated.

The receiving layer 4 is generally composed mainly of a thermoplastic resin. Examples of the material for forming the receiving layer include polyolefin resins such as polypropylene, vinyl chloride / vinyl acetate copolymer, ethylene / vinyl acetate copolymer, halogenated polymers such as polyvinylidene chloride, polyvinyl acetate, and polyacryl. Examples include polyester resins such as esters, polystyrene resins, polyamide resins, copolymer resins of olefins such as ethylene and propylene with other vinyl monomers, ionomers, cellulose resins such as cellulose diacetate, and polycarbonate resins. Particularly preferred among them are polyester resins, vinyl chloride / vinyl acetate copolymers, and mixtures thereof.

In sublimation transfer recording, a release agent is added to the receiving layer in order to prevent fusion of the thermal transfer sheet having the colored transfer layer with the receiving layer of the thermal transfer image receiving sheet or a decrease in printing sensitivity. Can be mixed. Preferred release agents used by mixing are silicone oil,
Phosphate-based surfactants, fluorine-based surfactants and the like can be mentioned, and among them, silicone oil is desirable. As the silicone oil, modified silicone oils such as epoxy-modified, vinyl-modified, alkyl-modified, amino-modified, carboxyl-modified, alcohol-modified, fluorine-modified, alkylaralkyl-polyether-modified, epoxy-polyether-modified, and polyether-modified are preferable.

One or more release agents are used. Further, the amount of the release agent to be added is as follows.
0.5 to 30 parts by weight per 100 parts by weight is preferred. If the addition amount range is not satisfied, problems such as fusion between the sublimation type thermal transfer sheet and the receptor layer of the thermal transfer image receiving sheet or reduction in printing sensitivity may occur. By adding such a release agent to the receptor layer, the release agent bleeds out on the surface of the receptor layer after the transfer to form a release layer. Further, these release agents may be separately coated on the receiving layer without being added to the receiving layer.

The receiving layer is formed by dissolving a resin obtained by adding necessary additives such as a releasing agent to the above-described resin on a sealing base material in an appropriate organic solvent, or dispersing the resin in an organic solvent or water. The body is applied on a sealing substrate by a conventionally known method, that is, a gravure coat, a gravure reverse coat, a roll coat, or the like, and dried to form the receptor layer 4. In forming the receiving layer, a white pigment, a fluorescent whitening agent, or the like can be added for the purpose of improving the whiteness of the receiving layer to further enhance the sharpness of a transferred image. The receiving layer formed as described above may have any thickness, but generally has a thickness of 1 to 50 μm in a dry state.

The receiving layer is preferably a continuous coating, but may be formed as a discontinuous coating using a resin emulsion or a water-soluble resin or a resin dispersion. Further, in order to stabilize the transfer of the thermal transfer printer, on the receiving layer, fatty acid esters, sulfates, phosphates, amides, quaternary ammonium salts, betaines, amino acids, acrylics, which are antistatic agents. An antistatic layer can be formed by dissolving or dispersing a resin, an ethylene oxide adduct, and the like in a solvent at a coating amount of 0.001 to 0.1 g / m ² when dried.

A receiving layer is formed on the above sealing base material,
Release layer, paper substrate, the pressure-sensitive adhesive layer formed on the release layer of the peeling portion consisting of the back surface layer and the support side of the sealing substrate, the heat transfer image-receiving sheet of the present invention is obtained. . The method for laminating is the same as the method for laminating the plastic film having microvoids and the support described above. However, it is necessary to select the kind of the adhesive so that the adhesive layer and the release layer can be separated. The thermal transfer image-receiving sheet of the present invention may be in a sheet-like form or in a form wound in a roll around a core. The roll-shaped thermal transfer image receiving sheet
The receiving layer is preferably wound so that the surface of the receiving layer is located outside the roll. As shown in FIG. 4A, the receiving layer is formed into a convex curl so that the curl after image formation is reliably generated. Can be prevented.

(Method of Manufacturing Thermal Transfer Image-Receiving Sheet) In the method of manufacturing the thermal transfer image-receiving sheet of the present invention, a receiving layer is provided on the plastic film side of a sealing substrate in which a plastic film having microvoids inside the substrate and a support are laminated. ,
Release layer, paper substrate, a peeling portion consisting of a back layer, forming an adhesive layer on the release layer, or forming an adhesive layer on the support of the seal substrate, a support, In a method of manufacturing a thermal transfer image-receiving sheet by laminating an adhesive layer and a release layer in the order of lamination, the tension at the time of laminating the release portion side is higher than the tension at the time of laminating the seal base material. 4A, the concave curl is formed on the side of the peeling portion having a large tension, that is, the convex curl is formed on the receiving layer side as shown in FIG. 4A, and the concave curl is formed on the receiving layer side after image formation (FIG. 4B). ), The occurrence of curl of the entire thermal transfer image-receiving sheet can be more reliably prevented.

However, the tension at the time of lamination on the side of the peeling portion and the tension at the time of lamination of the sealing base material are the respective tensions before laminating both, and after laminating. It is one. The pressure-sensitive adhesive layer may be provided on the support of the sealing base material, or may be provided on the release layer, but the pressure-sensitive adhesive layer is in close contact with the support, and the final form of the thermal transfer image-receiving sheet is used. When the peeling portion is peeled off, the pressure-sensitive adhesive layer needs to remain on the support side, not on the release layer side.
For this purpose, it is preferable to perform a corona discharge treatment or an easy adhesion treatment on the support side. Preferably, a silicone-based release agent or a wax-based release agent is applied to the outermost surface of the release layer.

The method for forming an image on the thermal transfer image-receiving sheet of the present invention formed as described above may be a conventionally known sublimation type thermal transfer type or a heat melting type thermal transfer type. For example, three colors of yellow, cyan and magenta may be used. A desired full-color image is formed on the receiving layer of the thermal transfer image-receiving sheet by using a thermal transfer printer of a known thermal head type using a thermal transfer sheet having a colored transfer layer in a plane-sequential manner. Next, the seal portion including the image-formed receiving layer and also including the seal substrate and the pressure-sensitive adhesive layer is peeled off from the peeling portion, and can be attached to any article.

[0031]

The present invention will be described more specifically with reference to the following examples and comparative examples. It should be noted that “part” or “%” in the text is based on weight. (Example 1) As a plastic film having microvoids inside a substrate, a biaxially stretched polypropylene film (Toyopearl SS P4255 3 manufactured by Toyobo Co., Ltd.)
Thermal shrinkage of 0.8 after standing at 5 [mu] m thickness and 110 [deg.] C. for 60 seconds
%) And a PET film (38 μm thick, 1
Using a heat shrinkage of 0% after standing at 10 ° C. for 60 seconds), the plastic film having microvoids and the support were
The adhesive was laminated by a dry lamination method at a solid content of 3.0 to 4.0 g / m ² to produce a seal base material. On the plastic film having microvoids of the sealing base material, a receiving layer having the following composition was formed by gravure reverse coating at a coating amount of 4 g / m ^{2 as} a solid content. Was formed by gravure coating with a solid content of 8 g / m ² to form a seal portion.

Receptive layer coating liquid Vinyl chloride-vinyl acetate copolymer 12.0 parts (# 1000A, manufactured by Denki Kagaku Kogyo Co., Ltd.) Epoxy-modified silicone 0.8 parts (Shin-Etsu Chemical Co., Ltd., X- 22-3000T) Amino-modified silicone 0.24 parts (Shin-Etsu Chemical Co., Ltd., X-22-1660B-3) Methyl ethyl ketone / toluene (1/1) 60.0 parts

Adhesive layer coating liquid acrylic copolymer (manufactured by Soken Chemical Co., Ltd., SK Dyne 1310L) 48 parts Epoxy resin (manufactured by Soken Chemical Co., Ltd., curing agent E-AX) 0.36 parts Ethyl acetate 51 .64 copies

On the other hand, as a paper base material, coated paper (manufactured by Nippon Kaishi Paper Co., Ltd., NK High Coat, basis weight 73.3 g /
m ² ), the following polyethylene resin layer is formed on one surface thereof by extrusion coating so as to have a thickness of 15 μm, and on the other surface of the coated paper, the following polypropylene is formed by extrusion coating as the back layer. A resin layer was formed so as to have a thickness of 35 μm, and a peeled portion was formed. However, on the above polyethylene resin layer,
A silicone coating solution having the following composition was applied by gravure coating at a solid content of 0.1 g / m ² to form a release layer. Silicone coating solution addition polymerization type silicone (KS847H, manufactured by Shin-Etsu Chemical Co., Ltd.) 100 parts Toluene 200 parts

The above-mentioned seal portion and peeling portion are formed by dry lamination so that the pressure-sensitive adhesive layer and the release layer are in contact with each other.
The sheet was laminated and wound around a core having an outer diameter of 165 mm such that the receiving layer was on the outside of the roll, thereby producing a roll-shaped thermal transfer image-receiving sheet of Example 1. However, at the time of lamination,
The tension at the time of lamination at the peeling part side was larger than the tension at the time of lamination at the seal part. (Tension of 13.0 kg /
300mm width, tension of seal part 3.0kg / 300mm
Width)

Example 2 Except that the support used in Example 1 was changed to a polyethylene terephthalate film having a microvoid inside (thickness of 38 μm, heat shrinkage 0.5% after standing at 110 ° C. for 60 seconds). In the same manner as in Example 1, a roll-shaped thermal transfer image-receiving sheet of Example 2 was produced.

Comparative Example 1 A roll-shaped thermal transfer image-receiving sheet of Comparative Example 1 was produced in the same manner as in Example 1 except that the support used in Example 1 was omitted. Comparative Example 2 A roll-shaped thermal transfer image-receiving sheet of Comparative Example 2 was produced in the same manner as in Example 1 except that the backside layer used in Example 1 was omitted.

An image was formed by thermal transfer from each of the roll-shaped thermal transfer image-receiving sheets of the above Examples and Comparative Examples under the following conditions. Thermal transfer sheet (CP-Mitsubishi Electric Co., Ltd.) having three color layers of yellow, magenta, and cyan in a sequential order.
700) and each of the above roll-shaped thermal transfer image-receiving sheets using a thermal transfer printer (CP-7 manufactured by Mitsubishi Electric Corporation).
00), an image of a certain test pattern was formed.

(Evaluation method) The transportability of each thermal transfer image receiving sheet by the above thermal transfer printer, the curl state of each thermal transfer image receiving sheet before and after image formation under the above conditions, and the obtained image formed product Was evaluated for image quality. Conveyability The transferability of each thermal transfer image receiving sheet in a thermal transfer printer, that is, whether the edges of the image receiving sheet are rubbed during transport (due to curl of the image receiving sheet), or if the continuous image receiving sheet is cut by a cutter and then clogged when discharged Was examined to see if any problem occurred. The evaluation criteria are as follows. ：: The edge of the image receiving sheet was not rubbed during transport, and there was no clogging at the time of discharge, and the transportability was good. X: The end of the image receiving sheet has a rubbed portion during conveyance, and clogging occurs at the time of discharge, resulting in poor conveyance.

Each of the thermal transfer image receiving sheets before and after the curl image formation was 140 mm ×
It is cut into 110 mm, except that a continuous image receiving sheet in a roll shape is cut into a width of 110 mm at a width of 140 mm in a flow direction,
As shown in FIG. 5D, when the thermal transfer image-receiving sheet has a concave curl on the receiving layer surface, the thermal transfer image-receiving sheet is placed on a horizontal surface one by one with the receiving layer surface facing upward, and the height of the four corners or four sides from the horizontal plane is set. The height is measured with a JIS first-grade gold scale, and the maximum height is used as an evaluation value, and the numerical value is represented by + (plus). On the other hand, FIG.
In the case where the thermal transfer image-receiving sheet has a convex curl on the surface of the receiving layer as shown in FIG. 5, the receiving layer is placed on a horizontal surface with the surface of the receiving layer facing down, and the maximum height of the four corners or four sides from the horizontal plane is similarly evaluated. , And the numerical values are expressed by-(minus).

Based on the above curl evaluation value, the curl situation is evaluated according to the following criteria. B: Before image formation, the surface of the receiving layer was convex curl, and the curl evaluation value was −20 mm or more and 0 mm (flat) or less. After image formation, the curl evaluation value was −10 mm or more and 0 mm (flat) or less. It is. B: Before image formation, the surface of the receiving layer was convex curl, and the curl evaluation value was −10 mm or more and 0 mm (flat) or less, and after image formation, the curl evaluation value was 0 mm (flat) or more.
10 mm or less, which is almost good. ×: Before image formation, the receiving layer surface was already concave curl,
After the image formation, the concave curl increases further, which is defective.

Image Quality The image obtained under the above image forming conditions was visually examined for the degree of color development of the test pattern and the image reproducibility.
The evaluation criteria are as follows. Good: Both the degree of color development of the test pattern and the image reproducibility are good. Δ: There is a part of the test pattern where the coloring is lowered.

(Evaluation Results) The evaluation results are shown in Table 1 below.

[Table 1]

[0044]

As described above, the thermal transfer image-receiving sheet of the present invention comprises at least a sealing portion in which a receiving layer, a sealing substrate and an adhesive layer are laminated in this order, a release layer, a paper substrate and a back surface layer. The adhesive layer and the release layer are releasably bonded to each other, and a plastic film having microvoids inside the base material is used as the seal base material. Since the support is laminated on the agent layer side, the support during the image forming process prevents shrinkage from occurring on the heated surface side of the plastic film, thereby curling the thermal transfer image receiving sheet. Does not occur.

Further, in particular, when a polypropylene film having microvoids inside the base material is used as the sealing base material, the polypropylene film is likely to be concavely curled toward the receiving layer side, and the support stops the curl. In the peeled portion of the, by increasing the thickness of the release layer and the back layer, the back layer is larger than the release layer,
By forming the peeling portion in a convex curl toward the release layer side, the curl of the thermal transfer image receiving sheet can be more reliably prevented. Therefore, clogging does not occur at the time of discharge by the printer, and the edge is not rubbed during the transfer of the thermal transfer image receiving sheet to the printer, and further, there is a cushioning and heat insulating property as a sealing base material, having microvoids inside the base material Since a plastic film is used, an excellent image with high density and high resolution can be obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing one embodiment of a thermal transfer image receiving sheet of the present invention.

FIG. 2 is a cross-sectional view of a conventional thermal transfer image receiving sheet on which a thermal transfer image has been formed.

FIG. 3 is a diagram illustrating a state in which a peeled seal portion is attached to another article.

FIG. 4 is a schematic diagram illustrating a convex curl and a concave curl of a thermal transfer image receiving sheet and a peeling portion.

FIG. 5 is a schematic diagram illustrating a measuring method and a notation method when evaluating the curl state of the thermal transfer image receiving sheet in a sheet state.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Thermal transfer image-receiving sheet 2 Seal part 3 Peeling part 4 Reception layer 5 Seal base material 6 Plastic film having microvoids inside the base material 7 Support 8 Adhesive layer 9 Release layer 10 Paper base material 11 Back surface layer 12 Image 13 Article

Claims (7)

[Claims] Claims: 1. A sealing portion in which at least a receiving layer, a seal base material, and an adhesive layer are laminated in this order, a release layer, a paper base material,
A thermal transfer image-receiving sheet comprising a peeling portion comprising a back surface layer, wherein the pressure-sensitive adhesive layer and the release layer are peelably bonded to each other, wherein the sealing base material uses a plastic film having microvoids inside the base material. A heat transfer image-receiving sheet, wherein a support is laminated on the pressure-sensitive adhesive layer side of the plastic film. 2. The thermal transfer image-receiving sheet according to claim 1, wherein the plastic film having microvoids inside the substrate is a polypropylene film. 3. The thermal transfer image-receiving sheet according to claim 1, wherein the support has a shrinkage of 0 to 0.5% after being left at 110 ° C. for 60 seconds. 4. The thermal transfer image receiving sheet according to claim 1, wherein the release layer and the back surface layer of the peeling portion are formed by extrusion coating on a paper base material. 5. The thermal transfer image-receiving sheet according to claim 1, wherein the thickness of the release layer and the back surface layer of the peeling portion is larger on the back surface layer than on the release layer. 6. The thermal transfer image-receiving sheet according to claim 1, wherein said receiving layer is wound so that the surface of said receiving layer is outside the roll. 7. A sealing substrate obtained by laminating a plastic film having microvoids inside a substrate and a support, a receiving layer is provided on the plastic film side, a release layer, a paper substrate,
A peeling portion comprising a back layer, an adhesive layer is formed on the release layer, or an adhesive layer is formed on a support of the sealing base material, the support, the adhesive layer, the release layer In the method for manufacturing a thermal transfer image-receiving sheet by laminating in order, the tension at the time of laminating the peeling portion side is larger than the tension at the time of laminating the seal base material. A method for manufacturing an image receiving sheet.