JPH11296085A - Thermal transfer image receiving sheet for seals and stickers - Google Patents

Abstract

(57) [Problem] To provide a thermal transfer image-receiving sheet for sealing which is free from air bubbles in an image area when the thermal transfer image-receiving sheet on which an image is formed is adhered as a seal. SOLUTION: At least a base material, a pressure-sensitive adhesive layer provided on the back side of the base material, and a release sheet 5 provided on the back side of the pressure-sensitive adhesive layer so as to be releasable are provided. A seal thermal transfer image-receiving sheet 1 to be attached to an adhered body, wherein the release sheet 5 has a seal thermal transfer image-receiving sheet 1 having a half-cut portion 10 formed in a circular shape along the outer periphery of the release sheet 5. Has solved the above-mentioned problem. Since the peeled portion 13 can be easily peeled off by the formed half cut portions 10 and 14, the peeled portion 13
The heat transfer image-receiving sheet for sealing 1 can be bonded as a seal onto the adherend without bubbles by the adhesive layer exposed after the peeling.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat transfer image-receiving sheet and a sticker to be used for sealing.
More specifically, the present invention relates to a heat transfer image-receiving sheet for sealing and a sticker to which a bubble is not attached to an image area when the sticker is stuck to an adherend.

[0002]

2. Description of the Related Art With the diversification of uses of thermal transfer image-receiving sheets, heat transfer image-receiving sheets for sealing which can be attached as stickers to arbitrary objects have been developed.
The heat transfer image-receiving sheet for sealing is usually a substrate, a colorant receiving layer provided on the front side of the substrate, an adhesive layer provided on the back side of the substrate, and a back surface of the adhesive layer. And a peelable release sheet provided on the side. The color material is transferred from the thermal transfer sheet to the color material receiving layer of the thermal transfer image receiving sheet for sealing by a thermal transfer method, for example, a sublimation thermal transfer method, and an arbitrary image is formed. The release sheet provided on the back surface of the thermal transfer image receiving sheet on which the image has been formed is peeled off, and the thermal transfer image receiving sheet is attached as a seal on the adherend by the exposed adhesive layer.

[0003]

However, as shown in FIG. 4, when the thermal transfer image-receiving sheet 41 as described above is adhered to the adherend 42 as a seal, the thermal transfer image-receiving sheet 41 and the adherend 42 are not adhered to each other. When air is taken in during
Since the air bubbles 44 accompany the image area A of the obtained patch 43, the quality of the patch 43 is significantly reduced. Therefore, at the time of sticking, the sticking must be performed while evacuating the air between the sticking body 42 and the thermal transfer image receiving sheet 41,
Attachment of such a seal was troublesome.

Accordingly, an object of the present invention is to provide a heat transfer image-receiving sheet for sealing and a sticker to which the image area is free from air bubbles when the heat transfer image-receiving sheet on which an image is formed is adhered as a seal. It is in.

[0005]

Means for Solving the Problems The present invention comprises a base material, an adhesive layer provided on the back side of the base material, and a release sheet provided on the back side of the adhesive layer so as to be peelable. A heat transfer image-receiving sheet for a seal provided at least, wherein the release sheet is characterized in that a half-cut portion is formed in a circular shape along the outer periphery of the release sheet.

According to this invention, since the half cut portion is formed in a circular shape along the outer periphery of the release sheet,
Only the release sheet from the half-cut portion to the outer peripheral edge of the release sheet (hereinafter, referred to as a “release portion”) can be removed. Then, the heat transfer image-receiving sheet for sealing of the present invention can be bonded as a seal on the adherend by the adhesive layer exposed after the peeling portion is peeled off. By forming the half-cut portion outside the formed image region so as not to overlap with the formed image region, a portion with air bubbles does not appear in the image region of the bonded thermal transfer image-receiving sheet for sealing. The thus-obtained patch does not involve air bubbles in the image area unlike the related art, and therefore does not lower the quality of the patch. Also, bonding can be easily performed.

[0007] It is preferable that a half-cut portion connecting one point of the half-cut portion to one point of an outer peripheral end of the release sheet is further formed. According to the present invention, since the cut by the half cut portion formed so as to connect one point of the outer peripheral end portion of the release sheet to one point of the half cut portion is provided. It can be easily peeled off.

It is preferable that the half-cut portion is provided at least on the release sheet. Thereby, the peeling portion can be easily peeled.

In the present invention, the heat transfer image-receiving sheet for sealing and the medium having a smooth surface are exposed by peeling the release sheet from the half-cut portion to the outer peripheral edge of the release sheet. It is bonded by the pressure-sensitive adhesive layer. Since this sticker is obtained by sticking the heat transfer image-receiving sheet for sealing from which the peeling portion has been peeled off onto a medium having a smooth surface as an object to be stuck, the image area of the heat transfer image-receiving sheet for sticker which is stuck together Does not show any part with air bubbles. The sticker thus obtained does not involve air bubbles in the image area, so that the quality of the sticker does not deteriorate.

[0010]

FIG. 1 is a sectional view showing an example of a thermal transfer image-receiving sheet for a seal according to the present invention. The thermal transfer image-receiving sheet 1 for sealing includes a substrate 2, a primer layer 6 provided on the front side of the substrate 2, a color material receiving layer 3 provided on the front side of the primer layer 6, and a back side of the substrate 2. The pressure-sensitive adhesive layer 4 includes a pressure-sensitive adhesive layer 4 provided on the side, a release sheet 5 provided releasably on the back side of the pressure-sensitive adhesive layer 4, and a slip layer 7 provided on the back side of the release sheet 5. Of these,
The base material 2, the pressure-sensitive adhesive layer 4, and the release sheet 5 are provided as essential layers, and the color material receiving layer 3, the primer layer 6, and the slip layer 7 are provided as needed. In addition to these layers, other layers provided on a conventionally known thermal transfer image-receiving sheet may be provided as necessary. Details of each of these layers will be described later.

FIG. 2 is a perspective view of an example of the thermal transfer image-receiving sheet for a seal according to the present invention when viewed from the back. On the release sheet 5 provided on the back side of the thermal transfer image receiving sheet 1 for sealing, a half-cut portion 10 is formed in a circular shape along the outer periphery of the release sheet 5. That is, the half-cut portion 10 is formed at a fixed distance D from the outer peripheral end 12 of the release sheet 5 and along the entire periphery of the outer peripheral portion of the release sheet 5.

In the half-cut, a release sheet having a constant interval D width from the half-cut portion 10 to be formed to the outer peripheral end portion 12 of the release sheet 5 (hereinafter, this ribbon-shaped portion having the constant interval width D is referred to as a “separating portion 13”). Is applied in order to easily peel off from the interface with the pressure-sensitive adhesive layer 4. It is preferable that the half cut portion 10 completely cuts at least the release sheet 5 as shown in FIG. By doing so, only the peeling portion 13 can be easily peeled off from the thermal transfer image-receiving sheet 1 for sealing. In addition, half cut part 1
0 may be cut to the pressure-sensitive adhesive layer 4 or to the boundary surface between the pressure-sensitive adhesive layer 4 and the substrate 2.

The half-cut portion 10 formed in a circular shape along the outer periphery of the release sheet 5 is preferably provided outside the image area A formed on the sealing thermal transfer image-receiving sheet 1 so as not to overlap. Further, the formation position of the half cut portion 10 is set at an arbitrary constant distance D from the outer peripheral end 12.
The heat transfer image receiving sheet 1 for sealing is formed with a width therebetween and can be appropriately changed depending on the size of the image area A formed on the thermal transfer image receiving sheet 1 for sealing.

It is preferable to form one or more half-cut portions 14 connecting one point of the half-cut portion 10 to one point of the outer peripheral end 12 of the release sheet 5. Since the half cut portion 14 acts as a cut from the outer peripheral end 12 of the release sheet 5 to the half cut portion 10, the release portion 13 can be peeled off from the half cut portion 14 in a ribbon shape.

In the half cut, the half cut portion 10 can be formed by a method such as a flat blade cutting method or a rotary die cutting method. Further, the shape of the half cut portions 10 and 14 to be formed may be linear, wavy, or rectangular, and is not particularly limited.

The thermal transfer image-receiving sheet 1 for a seal includes a peeling section 1
The adhesive layer 4 that is exposed after the strip 3 is peeled off is bonded to the adherend as a seal. FIG. 3 is a perspective view of an example of the thus obtained sticking object 31 when viewed from the front. Since the half-cut portion 10 is provided outside the thermal transfer image-receiving sheet 1 for sealing so as not to overlap the image area A, the adhesive layer 4 is attached to the adherend 33 with air bubbles. However, the image area A does not involve bubbles. Further, since the area of the pressure-sensitive adhesive layer 4 for bonding is significantly smaller than the area of the pressure-sensitive adhesive layer 4 for conventional bonding, air bubbles accompany between the pressure-sensitive adhesive layer 4 and the thermal transfer image-receiving sheet 1 for sealing. Never. The adhesive material 31 thus obtained does not involve air bubbles in the image area A unlike the related art, so that the quality of the adhesive material 31 does not deteriorate. In addition, bonding can be performed easily.

The adherend 33 to which the thermal transfer image-receiving sheet 1 for sealing of the present invention is adhered may be natural paper, synthetic paper,
Metals, resins, glass, wood, and the like that can provide a good bonding surface are given. In particular, it is preferable to use a medium having a surface smoothness and hardness as a bonded body in the form of a bonded body in order to maintain the quality of the seal bonded body. Since the obtained sticky sticky product does not have air bubbles in the image area, the quality of the sticky sticky product does not deteriorate.

Next, each layer constituting the thermal transfer image-receiving sheet for sealing of the present invention will be described.

[Substrate] As the substrate 2, the same substrate as that used in the conventional thermal transfer image-receiving sheet can be used, and there is no particular limitation. For example, synthetic paper, high quality paper,
Art paper, coated paper, cast paper, plastic film, film having microvoids, and the like can be used. In addition, a composite substrate in which two or more of these materials are used and which are laminated in multiple layers can also be used.

When a plastic film is used as the substrate 2, polyolefins such as polyethylene and polypropylene, polyesters such as polyethylene terephthalate and polyethylene naphthalate, polyvinyl chloride, polystyrene, polymethyl methacrylate, polycarbonate, cellophane, cellulose acetate, Arylate, polyethersulfone and the like can be used.

When used as a seal that requires transparency, a transparent substrate is used in these plastic films, but when used as a seal that does not require transparency, it is opaque. A plastic film or paper is used. When transparency is not required, a composite substrate in which two or more kinds are bonded is particularly effective.
Specifically, one or both sides of a paper or plastic film, a polypropylene film having microvoids attached thereto, or a film provided with a thin layer having no microvoids on both sides of polypropylene having microvoids, paper or A plastic film bonded to a plastic film can be used.

As a specific example of the base material 2 that is particularly preferable for sealing, for example, “Toyopearl S” manufactured by Toyobo Co., Ltd.
SP4255 ”(thickness 35 μm) or“ MW247 ”(35 μm thick) manufactured by Mobile Plastic Europe.
m) or a polypropylene film having microvoids, or “W-900” manufactured by Diafoil Co., Ltd.
(Thickness: 50 μm) or “E-60” manufactured by Toray Industries, Inc.
(Thickness: 50 μm) or the like having a microvoid such as polyethylene terephthalate.

The thickness of the substrate 2 is not particularly limited, but is appropriately selected in consideration of the characteristics and strength of the seal, and is usually about 50 to 200 μm.

Further, one or both surfaces of the base material 2 may be subjected to an easy adhesion treatment as required. For example, a primer layer 6 can be provided on the front side of the base material 2 by performing a conventionally known primer treatment. Further, a corona discharge treatment may be performed.

[Coloring Material Receiving Layer] The coloring material receiving layer 3 is provided on a primer layer 6 provided on the front side of the substrate 2 as necessary.
It is provided as needed as needed, and is formed of a resin made of at least a binder resin and optionally added with various additives such as a release agent.

When the above-mentioned substrate 2 has a colorant-receiving property, an image can be formed directly on the substrate 2 by a hot-melt transfer method, and the colorant-receiving layer 3 is not necessarily required. On the other hand, when the base material 2 has poor color material receptivity or when it is desired to form a better gradation image, the color material receiving layer 3
Is preferably provided. Since the color material receiving layer 3 is excellent in color material receiving property, a color image or the like with high density and good gradation can be transferred and formed by heat transfer of the color material from the thermal transfer sheet. In particular, a sublimation thermal transfer method using a sublimable dye as a coloring material is preferable because an excellent image can be formed.

As the binder resin constituting the color material receiving layer 3, an appropriate binder resin is used according to the kind of the applied thermal transfer method. For example, when performing sublimation thermal transfer, a resin having good dyeability of the sublimable dye is used, and when performing thermal melting transfer, a resin having good transferability of hot-melt ink is used. When sublimation heat transfer is desired, the binder resin for the colorant receiving layer may be a conventional colorant receiving resin such as a saturated polyester resin, a polyacrylate resin, a vinyl chloride-vinyl acetate copolymer resin, a polystyrene resin, or a polyamide resin. The materials used for layer formation can be used alone or as a mixture. In particular, a mixture of an ethylene-vinyl acetate copolymer and polyvinyl chloride is preferred.

The coloring material receiving layer 3 is prepared by adding various auxiliaries as necessary to the above resin and dissolving or dispersing in a suitable solvent to prepare a composition in a usual manner, for example, gravure coating or gravure reverse. It can be formed by coating and drying with a coat or roll coat or the like. Color material receiving layer 3
Is usually 0.1 to 10 μm in a dry state.

In order to prevent the thermal fusion between the color material receiving layer 3 and the thermal transfer sheet, a release agent is thinly applied on the front side of the color material receiving layer 3 as necessary to release the layer (see FIG. Or a release agent may be included in the colorant receiving layer 3. Examples of the release agent include silicone oil (for example, a combination of an epoxy-modified silicone and an amino-modified silicone),
A fluorine-based or phosphate-based surfactant or the like can be used.

[Pressure-sensitive adhesive layer] The pressure-sensitive adhesive layer 4 is provided as an essential layer on the back side of the substrate 2, and the heat transfer image-receiving sheet 1 for sealing after the release sheet 5 is peeled off is applied to the adherend. It is provided for suitable bonding.

As the material constituting the pressure-sensitive adhesive layer 4, any of conventionally known solvent-based pressure-sensitive adhesives and water-based pressure-sensitive adhesives can be used. For example, vinyl acetate resin, acrylic resin, vinyl acetate-acryl copolymer, vinyl acetate-vinyl chloride copolymer, ethylene-vinyl acetate copolymer, polyurethane resin, natural rubber, chloroprene rubber, nitrile rubber and the like can be mentioned. As the pressure-sensitive adhesive used in the present invention, a pressure-sensitive adhesive having good adhesive strength with the base material 2 described later and having a peel strength with the release sheet 5 described later within a predetermined range is selected and used. Is preferred.

The pressure-sensitive adhesive layer 4 is formed by applying a coating solution for the pressure-sensitive adhesive layer on the back side of the substrate 2 by a conventionally known method, for example, a gravure coat, a gravure reverse coat, a roll coat, or the like, and drying. can do. The thickness of the pressure-sensitive adhesive layer 4 is usually 1 to 50 μm in a dry state.

[Release Sheet] The release sheet 5 is provided as an essential layer on the back side of the pressure-sensitive adhesive layer 4 described above. As the release sheet 5, various single-layer films or composite films similar to the above-described base material 2 can be used, and plain paper, synthetic paper, or cellulose fiber paper can also be used. Examples of cellulosic fiber paper include woodfree paper,
Coated paper, art paper, cast-coated paper, or processed paper impregnated, coated, or internally impregnated with a constituent resin or rubber may be used. In particular, a polyethylene terephthalate film and a laminated paper such as polyethylene are preferable.

As the release sheet 5, a surface-untreated polyolefin film, for example, a stretched or unstretched film of polyethylene or polypropylene can be used, and a stretched or unstretched polypropylene film is particularly preferable. Specific examples include "Pyren" manufactured by Toyobo Co., Ltd. and "Trefane" manufactured by Toray Industries, Inc.

The thickness of the release sheet 5 is usually about 35 to 150 μm in consideration of its strength and the effect on the thickness of the entirety of the thermal transfer image receiving sheet 1 for sealing. If the release sheet 5 is too thin, the stiffness of the obtained thermal transfer image-receiving sheet 1 for sealing becomes weak, so that the thermal transfer image-receiving sheet 1 for sealing cannot be conveyed in the thermal transfer printer, or the thermal transfer image-receiving sheet 1 for sealing becomes wrinkled. May occur. On the other hand, if the release sheet 5 is too thick, the resulting thermal transfer image-receiving sheet 1 for sealing becomes thicker, so that a large force is required to drive the thermal transfer image-receiving sheet 1 for sealing in the thermal transfer printer, and the printer may fail. In some cases, the thermal transfer image-receiving sheet 1 for sealing cannot be normally conveyed.

The peel strength between the stretched or unstretched polypropylene film and the pressure-sensitive adhesive layer 4 (measured by a peel strength of 180 ° according to JIS-Z-237) is 100 to 2
It is preferably in the range of 500 g, preferably 700-2000 g. Such a peeling strength can be easily adjusted by selecting a material for forming the pressure-sensitive adhesive layer 4 without performing a conventional release treatment. By adjusting the peel strength of the release sheet 5 to the above range, the peeled portion 13 that has been half-cut can be easily peeled and used as a seal, and the peeled portion 13 that has been half-cut can be used for image formation. There is no peeling inside.

A release layer (not shown) is formed on the front side of the release sheet 5, that is, on the side facing the adhesive layer 4 so that the release sheet 5 can be easily released from the adhesive layer 4. be able to. As a material for forming the release layer, a silicone-based release agent mainly composed of polymethylsiloxane or the like, polyolefin, or the like can be given. The release layer can be formed by applying and drying a coating liquid for a release layer by a conventionally known method. The thickness of the release layer is
It is usually 0.01 to 15 μm in a dry state.

Further, a slip layer 7 may be provided on the back side of the release sheet 5 for improving the mechanical transferability of the obtained thermal transfer image-receiving sheet for sealing and preventing curling. Examples of a material for forming the slip layer 7 include resins such as an acrylic resin, a cellulose resin, a polycarbonate resin, a polyvinyl acetal resin, a polyvinyl alcohol resin, a polyamide resin, a polystyrene resin, a polyester resin, and a halogenated polymer. Among them, an organic filler such as an acrylic filler, a nylon-based filler, a Teflon-based filler, or a polyethylene wax, and an inorganic filler such as silicon dioxide or a metal oxide can be used. When the release sheet 5 is paper, it can be used by impregnating and applying an emulsion such as polyethylene wax or polypropylene wax. Further, a detection mark or the like may be formed on the back surface of the release sheet 5 or on the release layer. The slip layer 7 can be formed by applying and drying a coating liquid for a slip layer by a conventionally known method, for example, a gravure coat, a gravure reverse coat, a die coat or the like. The thickness of the slip layer 7 is usually 1 to 50 μm.

[0039]

EXAMPLES The thermal transfer image-receiving sheet for a seal of the present invention and the method for producing the same will be specifically described below.

(Example 1) First, a substrate 2 having a thickness of 50
Using a transparent polyethylene terephthalate film with a thickness of 3 μm
Was formed. On the front side of the primer layer 6, a coating material for a color material receiving layer having the following composition was applied so as to have a thickness of 5 μm after drying, and dried to form a color material receiving layer 3.

Coating liquid for color material receiving layer (total 100 parts by weight); Polyester resin (Byron 200: manufactured by Toyobo Co., Ltd.) 20 parts by weight Organic silicone (X-22-3000T: manufactured by Shin-Etsu Chemical Co., Ltd.) 2 Parts by weight Toluene 39 parts by weight Methyl ethyl ketone 39 parts by weight

Next, a pressure-sensitive adhesive layer coating liquid having the following composition was applied on the back side of the substrate 2 so that the thickness after drying was 10 μm, and dried to form a pressure-sensitive adhesive layer 4.

Acrylic resin (SK Dyne 1310L) 50 parts by weight Ethyl acetate 50 parts by weight

Further, a white polyethylene terephthalate film having a thickness of about 100 μm was used as the release sheet 5 and was adhered to the back surface of the pressure-sensitive adhesive layer 4 to produce a thermal transfer image-receiving sheet 1 for sealing. In addition, on the back side of the release sheet 5,
Further, a slip layer 7 having a thickness of 1 μm was provided.

A half cut was performed from the slip layer 7 to the pressure-sensitive adhesive layer 4 of the obtained thermal transfer image-receiving sheet 1 for sealing by a rotary die-cut method. As shown in FIG. 2, the half-cut pattern extends along the entire periphery of the release sheet 5 at a constant distance D from the outer peripheral end 12 of the release sheet 5 on the outer periphery of the release sheet 5. A half cut portion 10 is formed, and the half cut portion 10
The half cut portion 14 extending from the edge to the outer peripheral end portion 12 was formed.

An image was formed on the color material receiving layer 3 of the thermal transfer image-receiving sheet for sealing 1 on which the half cut portions 10 and 14 were formed by a sublimation transfer method. After the image formation, the peeling portion 13 of the release sheet 5 was peeled in a ribbon shape from the half cut portion 14 as a starting point. The thermal transfer image-receiving sheet for sealing 1 from which the peeling portion 13 was peeled off was bonded as a seal on the adherend 33 by the exposed adhesive layer 4. Since the half-cut sections 10 and 14 are provided outside the thermal transfer image-receiving sheet 1 for sealing so as not to overlap the image area A, the adhesive layer 4 is attached to the adherend 33 with air bubbles. Even when attached, the image area A did not have bubbles.

Comparative Example 1 The same thermal transfer image-receiving sheet for sealing as in Example 1 was produced. An image was formed on the color material receiving layer 3 of the heat transfer image-receiving sheet for sealing by a sublimation transfer method without performing the half-cut processing. After image formation, the entirety of the release sheet 5 is peeled off, and the heat transfer image receiving sheet 1 for sealing is removed.
Was adhered to the adherend 33 by the exposed pressure-sensitive adhesive layer 4 as a seal. At the time of lamination, a seal-adhered product with air bubbles was obtained between the thermal transfer image-receiving sheet for sealing 1 and the adherend 33.

[0048]

As described above, according to the thermal transfer image-receiving sheet for sealing of the present invention, the peeled portion formed on the outer peripheral portion of the peelable sheet can be peeled off by the formed half-cut portion. The heat transfer image-receiving sheet for sealing of the present invention can be adhered as a seal on the adherend by the adhesive layer exposed after the portion is peeled off. Also,
By applying the half-cut to the outside so as not to overlap with the image area to be formed, a portion with air bubbles does not appear in the image area of the bonded thermal transfer image-receiving sheet for bonding. The thus-obtained patch does not involve air bubbles in the image area unlike the related art, and therefore does not lower the quality of the patch. In addition, bonding can be easily performed.

Further, since the sticker of the present invention is obtained by sticking the heat transfer image-receiving sheet for sealing from which the peeling portion has been peeled off onto the body to be stuck, the image area of the heat transfer image-receiving sheet for sticker is No part with air bubbles appears. The sticker thus obtained does not involve air bubbles in the image area, so that the quality of the sticker does not deteriorate.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating an example of a thermal transfer image-receiving sheet for a seal according to the present invention.

FIG. 2 is a perspective view of an example of a thermal transfer image-receiving sheet for a seal according to the present invention when viewed from the back.

FIG. 3 is a perspective view showing an example of the adhesive article of the present invention.

FIG. 4 is a schematic view showing an example of a mode in which a heat transfer image-receiving sheet for a seal is stuck on an adherend.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 41 Thermal transfer image-receiving sheet for sealing 2 Substrate 3 Color material receiving layer 4 Adhesive layer 5 Release sheet 6 Primer layer 7 Slip layer 10, 11, 14 Half cut part 12 Outer peripheral end part 13 Peeling part 31, 43 Adhered material 32 Adhering parts 33, 42 Adhered body 44 Air bubbles A Image area D Constant intervals

Claims (4)

[Claims] 1. A thermal transfer image-receiving sheet for sealing comprising at least a substrate, an adhesive layer provided on the back side of the substrate, and a release sheet releasably provided on the back side of the adhesive layer. The thermal transfer image-receiving sheet for sealing, wherein the release sheet has a half-cut portion formed in a circular shape along the outer periphery of the release sheet. 2. The thermal transfer image-receiving sheet for sealing according to claim 1, further comprising a half-cut portion connecting one point of the half-cut portion to one point of an outer peripheral end of the release sheet. 3. The thermal transfer image-receiving sheet according to claim 1, wherein the half-cut portion is provided at least on the release sheet. 4. The release sheet from the half-cut portion to the outer peripheral edge of the release sheet, wherein the thermal transfer image-receiving sheet for sealing according to any one of claims 1 to 3 and a medium having a smooth surface are provided. And a sticker attached by the adhesive layer exposed by peeling off the adhesive.