JP2021011087A - Seal type thermal transfer image receiving sheet - Google Patents

Abstract

To provide a seal type thermal transfer image receiving sheet that can be readily and surely re-affixed.SOLUTION: A seal type thermal transfer image receiving sheet 100 is provided in which a release portion 10 and a seal portion 50 are integrated, the seal portion 50 is provided peelable from the release portion 10, and has a configuration in which at least an adhesive layer 60 and a receiving layer 80 allowing for formation of the thermal transfer image are laminated, the adhesive layer 60 is arranged opposite to the release portion 10, and comprises a plurality of concaves 610 on both surfaces, and satisfies the relationship of |Dave1-Dave2|/Dave2≤0.5 where Dave1 denotes an average value of diameters of the respective openings of the concaves 610 open on a surface on the release portion 10 side, and Dave2 denotes an average value of diameters of the respective openings of the concaves 610 opening on the receiving layer 80 side.SELECTED DRAWING: Figure 1

Description

The present invention relates to a seal type thermal transfer image receiving sheet.

In the method of manufacturing photographic paper by the thermal transfer method, the sublimation transfer method, which has excellent reproducibility and gradation of neutral colors and can easily form high-quality images, is applied to the face of digital photographs, ID cards, credit cards, etc. It is widely used for forming photographs. Further, in the amusement field, a seal-type thermal transfer image receiving sheet in which a release portion and a seal portion are detachably formed is used so that a printed matter on which an image such as a face photograph is formed can be attached as a sticker.

Patent Document 1 proposes such a seal-type heat transfer image receiving sheet in which an improved adhesive is used in order to reduce image quality deterioration of the printed matter due to the protrusion of the adhesive. Further, regarding the sticker type thermal transfer image receiving sheet, it may be desired that the sticker can be easily and surely replaced when the sticker sticking position shifts or when it is desired to change the object to which the sticker is stuck. However, the conventional sticker-type heat transfer image receiving sheet does not take such a problem into consideration, and it is difficult to peel off the sticker once, or even if it can be peeled off, the adhesive strength is reduced. In many cases, it is difficult to reattach it to another object.

On the other hand, Patent Document 2 proposes a micro suction cup film composed of an adhesive layer having a large number of minute suction cup groups on the surface on the adherend side. The micro suction cup film can be repeatedly attached and detached from the adherend, and it is conceivable to provide an adhesive layer composed of the micro suction cup film on the seal type thermal transfer image receiving sheet. Here, it is said that the composition of the document can produce a micro suction cup film even at room temperature, but it takes a long time to dry the applied composition at room temperature, and it is actually heated while heating. Needs to be dried. However, the seal-type thermal transfer image receiving sheet is provided with a receiving layer for image formation, and the receiving layer may be altered or deformed when heated in the manufacturing process for forming a micro suction cup film as an adhesive layer. Therefore, the above composition could not be applied to the seal type heat transfer image receiving sheet and used.

JP-A-2017-170852 JP-A-2017-36404

The present disclosure has been made in view of such a situation, and it is an object of the present invention to provide a seal type thermal transfer image receiving sheet that can be easily and surely replaced.

The seal-type heat transfer image receiving sheet according to the present embodiment is a seal-type heat transfer image receiving sheet in which the release portion and the seal portion are integrated, and the seal portion is provided so as to be removable from the release portion. A structure in which at least an adhesive layer and a receiving layer capable of forming a thermal transfer image are laminated, and the adhesive layer is arranged so as to face the release portion and has a plurality of concave shapes on both sides thereof. The average value of the diameters of the concave openings opened on the release portion side surface is set to D ^ave _1, and the average value of the diameters of the concave openings opened on the receiving layer side is D. ^{When it is ave} ₂ ,
｜ D ^ave ₁ − D ^ave ₂ ｜ / D ^ave ₂ ≤ 0.5
Satisfy the relationship.

The seal-type heat transfer image receiving sheet according to another embodiment of the present embodiment is a seal-type heat transfer image receiving sheet in which the release portion and the seal portion are integrated, and the seal portion is provided so as to be removable from the release portion. And at least provided with a receiving layer capable of forming a thermal transfer image, the release portion includes at least an adhesive layer and a base material, and the adhesive layer is arranged facing the sealing portion and on both sides thereof. Each concave opening having a plurality of concave shapes and having an average value of the diameters of the concave openings opened on the surface on the seal portion side is ^Dave _1, and the concave openings open on the receiving layer side. When the average value of the diameters of D ^ave ₂ is set to D ^ave ₂ , the relationship of | D ^ave ₁ − D ^ave ₂ | / D ^ave ₂ ≤ 0.5 is satisfied.

Further, in the seal type thermal transfer image receiving sheet according to another embodiment of the present embodiment, the receiving layer may be capable of receiving the sublimation dye.

Further, in the seal type thermal transfer image receiving sheet according to another embodiment of the present embodiment, the layer thickness of the adhesive layer may be 20 μm or more and 40 μm or less.

Further, in the seal type thermal transfer image receiving sheet according to another embodiment of the present embodiment, the adhesive layer is dried by including bubbles in the liquid resin composition, so that a plurality of the concave shapes based on the bubbles are formed on both sides. You may.

Further, in the seal type thermal transfer image receiving sheet according to another embodiment of the present embodiment, when the seal portion is used as the first seal portion, the surface of the release portion opposite to the surface on which the first seal portion is laminated. A seal-type thermal transfer image receiving sheet, characterized in that a second seal portion is laminated on the sheet.

According to the present embodiment, it is possible to provide a seal type thermal transfer image receiving sheet that can be easily and surely replaced.

It is sectional drawing of the seal type thermal transfer image receiving sheet of 1st Embodiment. It is a figure explaining the manufacturing apparatus of the seal type thermal transfer image receiving sheet. It is a figure explaining the manufacturing process of the seal type thermal transfer image receiving sheet. It is a figure explaining the process of forming a thermal transfer image on a seal type thermal transfer image receiving sheet, and is the cross-sectional view of the seal type thermal transfer image receiving sheet attached to an object. It is sectional drawing of the seal type thermal transfer image receiving sheet which concerns on the modification of 1st Embodiment. It is sectional drawing of the seal type thermal transfer image receiving sheet of 2nd Embodiment. It is sectional drawing of the seal type thermal transfer image receiving sheet of 3rd Embodiment. It is sectional drawing of the seal type thermal transfer image receiving sheet of 4th Embodiment. It is an enlarged photograph which looked at the adhesive layer of the seal type thermal transfer image receiving sheet of an Example from the object side. It is an enlarged view in the cross section in the direction orthogonal to the sheet surface of the seal type thermal transfer image receiving sheet of an Example. It is a figure which shows the observation result of the sample 1. It is a figure which shows the observation result of the sample 2. It is a figure which shows the observation result of the sample 3. It is a figure which shows the observation result of the sample 4.

Hereinafter, an example of the seal type thermal transfer image receiving sheet of the present disclosure will be described with reference to the drawings and the like. However, the sealed thermal transfer image receiving sheet of the present disclosure is not limited to the embodiments and examples described below.

It should be noted that each figure shown below is schematically shown. Therefore, the size and shape of each part, the illustration of the thickness of each layer in the cross-sectional view, and the like are exaggerated as appropriate for easy understanding. Further, in each drawing, hatching showing a cross section of the member is omitted as appropriate. Numerical values such as dimensions of each member and material names described in the present specification are examples as an embodiment, and are not limited thereto, and can be appropriately selected and used. In the present specification, terms that specify shapes and geometric conditions, such as parallel, orthogonal, and vertical, are intended to include substantially the same state in addition to their strict meanings. Further, for convenience of explanation, in each figure, the upper or lower side with respect to the paper surface may be described simply by using the phrase "upper or lower side", but in reality, the vertical direction may be reversed, and the same applies to the horizontal direction. And.

1. 1. First Embodiment The first embodiment regarding the seal type thermal transfer image receiving sheet of the present disclosure will be described. FIG. 1 is a cross-sectional view illustrating the configuration of the seal type thermal transfer image receiving sheet 100 of the first embodiment. FIG. 2 is a conceptual diagram illustrating an example of a manufacturing apparatus for the seal-type thermal transfer image receiving sheet 100 of the present embodiment, and FIG. 3 is a diagram illustrating a manufacturing process of the sealed thermal transfer image receiving sheet 100. Hereinafter, the structure, manufacturing method, and process of the seal type thermal transfer image receiving sheet 100 will be described. As shown in FIG. 1, the seal-type heat transfer image receiving sheet 100 is composed of a release portion 10 on the lower side and a seal portion 50 laminated on the upper side of the release portion 10, and is composed of a release portion. The 10 and the seal portion 50 are integrated.

(A) Release portion As shown in FIG. 1, the release portion 10 has a structure in which the release portion base material 20 and the release layer 30 are laminated in this order from the lower side. However, the release layer 30 is an arbitrary layer, and the release member 20 itself is subjected to fine unevenness processing on the surface of the base material 20 for the release portion or by using a known water-repellent processing technique such as plasma treatment. When imparting releasability, it is not necessary to provide the releasable layer 30. The release portion 10 is a portion that remains when the seal portion 50 is peeled off after the thermal transfer image is formed on the seal type thermal transfer image receiving sheet 100, and is used as a seal for ensuring transport stability during formation of the thermal transfer image. It is provided for the purpose of preventing unintended adhesion before use.

(I) Base material for mold release part The base material 20 for mold release part is a base of the mold release part 10, and forms a thermal transfer image after the seal portion 50 is laminated via the mold release layer 30. It imparts transportation and processing suitability at the time, and improves workability when the seal portion 50 is peeled off from the mold release portion 10. The material of the base material 20 for the mold release part is not particularly limited, and for example, polyester having high heat resistance such as polyethylene terephthalate and polyethylene naphthalate, and plastics such as polypropylene, polycarbonate, cellulose acetate, polyethylene derivatives, polyamide and polymethylpentene. Stretched or unstretched film can be used. Further, among these, alloys of two or more kinds of materials or laminated ones may be used. The thickness of the base material 20 for the release part can be appropriately selected depending on the required rigidity, heat resistance, etc., but for example, it is preferably 20 μm or more and 200 μm or less, and 50 μm or more and 150 μm or less. Is even more preferable.

(Ii) Release layer The release layer 30 is an arbitrary layer provided to facilitate peeling of the seal portion 50 laminated on the upper layer, and the material of the release layer 30 includes, for example, waxes. Silicone wax, silicone resin, silicone-modified resin, fluororesin, fluorine-modified resin, polyvinyl alcohol, acrylic resin, polyester, heat-crosslinkable epoxy-amino resin, heat-crosslinkable alkyd-amino resin and the like can be used. Further, the release layer 30 may contain the single material mentioned above, or may contain two or more kinds. Further, as described above, when the release property is imparted to the release portion base material 20 itself, it is not necessary to separately provide the release layer 30. The thickness of the release layer 30 may be, for example, 0.5 μm or more and 5 μm or less.

(B) Sealing portion As shown in FIG. 1, the sealing portion 50 is a layer laminated above the mold release portion 10 and provided so as to be peelable from the mold release portion 10, and the adhesive layer 60 is provided from the lower side. , The base material 70 for the sealing portion and the receiving layer 80 are laminated in this order. The seal portion 50 having the adhesive layer 60 may be provided so as to be detachable from the release portion 10 regardless of whether or not the release portion 10 has the release layer 30. After the thermal transfer image is formed on the seal type thermal transfer image receiving sheet 100, the seal portion 50 can be peeled off from the mold release portion 10 and attached to an arbitrary object, and can be peeled off and reattached. is there. As a result, the sticker portion 50 can be flexibly replaced even when the sticking position on the object is displaced or when it is desired to re-stick to a different object.

(I) Adhesive layer The adhesive layer 60 is a layer provided at the bottom layer of the seal portion 50, and is adjacent to the release layer 30 of the release portion 10. That is, the adhesive layer 60 is arranged closer to the release portion 10 than the receiving layer 80 described later, and has adhesiveness to an arbitrary object after the seal portion 50 is peeled from the release portion 10. The adhesive layer 60 is opened on both sides thereof, that is, a surface facing the release layer 30 side when the seal portion 50 and the mold release portion 10 are laminated, and a surface facing the release layer 70 side. It has a plurality of concave shapes 610. Further, the adhesive layer 60 has elasticity, and since each of the plurality of concave shapes 610 acts as a fine suction cup, it is possible to exert an adhesive force (adhesive force) on various objects.

The adhesive layer 60 is formed by, for example, a production method described later using a liquid resin composition (acrylic emulsion) disclosed in Patent Document 2 (Japanese Unexamined Patent Publication No. 2017-36404). The layer thickness t of the adhesive layer 60 is preferably 1 μm or more and 500 μm or less. If it is less than the lower limit of the layer thickness range, it becomes difficult to form the concave shape 610, or the size of the concave shape becomes too small, and the adhesive (adsorption) property deteriorates. Further, if the upper limit value of the layer thickness range is exceeded, the flexibility of the sealing portion 50 is lowered, and the workability is deteriorated. Further, in order to evenly provide the concave 610 on both surfaces of the adhesive layer 60, it is desirable that the layer thickness of the adhesive layer 60 is 20 μm or more and 40 μm or less. This point will be described later.

The size and density of the concave shape 610 of the adhesive layer 60 can be adjusted by changing various conditions in the manufacturing process described later. For example, the adhesive layer 60 can use the density of the adhesive layer 60 as an index indicating the degree to which the concave shape 610 is included. The density of the adhesive layer 60 is not particularly limited, but can be, for example, 0.1 g / cm ³ or more and 0.6 g / cm ³ or less. The size of the concave shape 610 is not particularly limited, but can be, for example, 1 μm or more and 300 μm or less.

(Ii) Base material for seal portion The base material 70 for a seal portion is an important member that imparts strength, flexibility, processability, and the like to the seal portion 50. The material of the base material 70 for the sealing portion is not particularly limited as long as the above requirements are satisfied. For example, the material exemplified in the base material 20 for the mold release portion can be appropriately selected, and a single layer made of the same base material is used. It may have a structure or a multi-layer structure in which base materials of different materials are laminated. The thickness of the base material 70 for the sealing portion can be appropriately selected depending on the required rigidity, heat resistance, etc., but is preferably 50 μm or more and 150 μm or less, for example.

(Iii) Receiving layer The receiving layer 80 is a layer formed on the outermost surface of one surface side of the sealing portion 50 and capable of receiving a heat-transferring coloring material such as a sublimation dye or a heat-meltable ink. As will be described later, the heat transfer sheet and the seal type heat transfer image receiving sheet 100 are superposed so that the dye layer or the heat-meltable ink layer of the heat transfer sheet and the receiving layer 80 are in contact with each other, and the thermal head is used to cover the back side of the heat transfer sheet. By applying heat from the ink layer 80, a heat transfer image can be formed on the receiving layer 80. In the present embodiment, the receiving layer 80 is a layer that can accept a sublimation dye, and a heat transfer image is formed by using a heat transfer sheet having a dye layer. The protective layer may be further transferred on the heat transfer image.

The components of the receiving layer 80 are not particularly limited, and a known receiving layer to be used for the thermal transfer image receiving sheet can be appropriately selected and used. For example, a polyolefin resin such as polypropylene, a halogenated resin such as polyvinyl chloride or polyvinylidene chloride, a vinyl resin such as polyvinyl acetate, a vinyl chloride-vinyl acetate copolymer, an ethylene-vinyl acetate copolymer or a polyacrylic acid ester. , Polyester resin such as polyethylene terephthalate or polybutylene terephthalate, polystyrene resin, polyamide resin, copolymer of olefin such as ethylene or propylene and other vinyl polymer, cellulose resin such as ionomer or cellulose diacetate, polycarbonate, acrylic resin, etc. Can be mentioned as a solvent-based resin. One of these materials may be used alone, or two or more of these materials may be used in combination. The thickness of the receiving layer 80 is not particularly limited, but is preferably 0.5 μm or more and 10 μm or less, and more preferably 1 μm or more and 5 μm or less.

(Iv) Primer layer A primer layer (not shown) may be provided between the constituent members constituting the seal portion 50, that is, between the layers, in order to improve the interlayer adhesion. The primer layer may be provided between all the layers constituting the seal portion 50, or may be provided between any of the layers. For example, a primer layer can be provided between the base material 70 for the sealing portion and the receiving layer 80.

Examples of the components of the primer layer include polyester, polyvinyl acetate, polyvinyl acetate, polyurethane, styrene acrylate resin, polyacrylamide, polyamide, polyether, polystyrene, polyethylene, polypropylene, polyvinyl chloride, polyvinyl alcohol, polyvinylpyrrolidone and the like. Vinyl resin, polyvinyl acetal such as polyvinyl acetacetal and polyvinyl butyral, inorganic particles and the like can be mentioned. The thickness of the primer layer is not particularly limited, but is preferably 0.8 μm or more and 2.5 μm or less, and more preferably 1 μm or more and 2.5 μm.

The overall thickness of the seal-type thermal transfer image receiving sheet 100 is not particularly limited, but is generally 150 μm or more and 300 μm or less, and preferably 200 μm or more and 250 μm or less. Further, a colorant or the like may be added to the layer constituting the seal portion 50.

(C) Manufacturing Step of Sealed Thermal Transfer Image Receiver Sheet Next, the manufacturing apparatus and manufacturing process of the sealed thermal transfer image receiving sheet 100 will be described with reference to FIGS. 2 and 3. FIG. 2 is a diagram for explaining a manufacturing apparatus for the seal-type heat transfer image receiving sheet 100, and FIG. 3 is a diagram for explaining a manufacturing process for the seal-type heat transfer image receiving sheet 100.

First, as shown in FIGS. 2 and 3B, the composition of the acrylic emulsion disclosed in Patent Document 2 for forming the adhesive layer 60 is placed in a stirrer, and nitrogen gas is mixed in the composition. While stirring, the composition contains air bubbles to prepare a resin composition 600 containing air bubbles (P1: whipping step).

Next, as shown in FIG. 3A, a mold release portion 10 in which the release portion base material 20 and the release layer 30 are laminated is prepared, and then shown in FIGS. 2 and 3 (b). As described above, the resin composition 600 containing bubbles is applied onto the surface of the release layer 30 of the release portion 10 (P2: coating step). In the coating step, for example, a comma coater (registered trademark) can be used, but other known coating methods may be used.

When the resin composition 600 containing bubbles is applied to the upper layer of the release portion 10, the resin composition 600 is dried while heating to form the adhesive layer 60, as shown in FIGS. 2 and 3 (c). (P3: Drying step). In the drying step, for example, a drying furnace having a temperature of about 60 ° C. or higher and 140 ° C. or lower can be used. As the drying time, for example, about 30 seconds or more and 10 minutes or less can be exemplified. Further, in the drying step, the drying may be promoted while blowing air on the resin composition 600 containing bubbles. By performing the drying step, concave shapes 610 are formed on both surfaces of the resin composition 600, and the adhesive layer 60 is formed.

The concave shape 610 is formed by breaking bubbles contained in the bubble-containing resin composition 600 and leaving a part of the shape of the bubbles. Here, if the bubbles burst in a state where the resin composition 600 is insufficiently cured, the concave shape 610 is unlikely to remain. On the other hand, if the resin composition 600 is cured before the bubbles burst, the concave shape 610 may not be formed. Therefore, it is desirable that the drying step is performed under the condition that the foam is broken while the resin composition 600 containing bubbles has been cured to some extent. Therefore, the temperature and the amount of air blown in the drying process have a great influence on the state of the concave shape 610.

After the adhesive layer 60 is formed by the drying step, as shown in FIGS. 2 and 3D, a separately prepared sheet in which the base material 70 for the sealing portion and the receiving layer 80 are laminated is bonded to the adhesive layer 60. (P4 in the figure: laminating process). In this laminating step, since laminating is performed by the adsorption force (adhesive force) due to the concave shape 610 of the adhesive layer 60, heating is not required, and bonding is possible with only a slight pressing force. Therefore, it is possible to prevent quality damage to the sheet on which the separately prepared base material 70 for the sealing portion and the receiving layer 80 are laminated.

When the laminating step is completed, the seal type thermal transfer image receiving sheet 100 is completed. As described above, in the production of the seal type thermal transfer image receiving sheet 100 of the present embodiment, when the adhesive layer 60 is formed on the sheet in which the base material 70 for the sealing portion and the receiving layer 80 are laminated, damage due to heat is given. The seal type thermal transfer image receiving sheet 100 can be efficiently manufactured. The seal-type thermal transfer image receiving sheet 100 may then be wound into a roll or cut into a required size.

(D) Image formation on a sticker-type thermal transfer image receiving sheet and attachment to an object Next, a thermal transfer image is formed on a sticker-type thermal transfer image receiving sheet 100 manufactured through the above steps based on FIG. I will explain the points to be attached to the object. FIG. 4A is a diagram showing a schematic structure of the thermal transfer printer 900. Further, FIG. 4B is a cross-sectional view showing a seal type thermal transfer image receiving sheet 101 on which the thermal transfer image 400 is formed, and FIG. 4C is a cross-sectional view in which the seal type thermal transfer image receiving sheet 101 is partially peeled off. It is sectional drawing which shows the state which was attached to the object 500 as a seal part 50A. In the present embodiment, for convenience, the seal type thermal transfer image receiving sheet before the thermal transfer image formation is referred to as the seal type thermal transfer image receiving sheet 100, and the sealed thermal transfer image receiving sheet after the thermal transfer image formation is referred to as the seal type thermal transfer image receiving sheet 101.

First, the seal-type thermal transfer image receiving sheet 100 wound in a roll shape is held in a holder (not shown) inside the thermal transfer printer 900, and the seal type thermal transfer image receiving sheet 100 is transferred from the roll-shaped wound state to the thermal head 901 of the recording unit 910. It is transported so that it is supplied near the lower end. Further, in the recording unit 910, a thermal transfer sheet 200 having a color material layer is held in a holder (not shown) inside the thermal transfer printer 900 in a form of being wound from a supply roll to a winding roll, and the thermal head 901 and the platen of the recording unit 910 are held. The thermal transfer sheet 200 and the seal type thermal transfer image receiving sheet 100 are overlapped and inserted between the roll 902 and the roll 902. At this time, the dye layer of the thermal transfer sheet 200 and the receiving layer 80 of the seal type thermal transfer image receiving sheet 100 come into contact with each other. In this state, by heating and pressurizing the thermal head 901, the color material layer of the thermal transfer sheet 200 is transferred as a thermal transfer image 400 to the receiving layer 80 of the seal-type thermal transfer image receiving sheet 100, thereby printing. The formation of the thermal transfer image is not limited to the sublimation transfer method, and may be a melt transfer method.

In this way, as shown in FIGS. 4 (b) and 4 (c), the seal-type heat transfer image receiving sheet 101 on which the heat transfer image 400 is transferred to the receiving layer 80 has the release portion 10 and the seal portion 50. The part of the seal portion 50 can be separated by using the release layer 30 as an interface as a trigger. Here, notches 310 and 320 are formed in advance in the seal type thermal transfer image receiving sheet 100 before the thermal transfer image formation or the seal type thermal transfer image receiving sheet 101 after the thermal transfer image formation so that the seal portion 50 can be peeled off as an individual piece. doing. The cuts 310 and 320 are half-cuts set to a depth that penetrates the front and back surfaces of the seal portion 50 in the thickness direction and does not penetrate at least the entire release portion 10. If the notch is formed in this way, as shown in FIG. 4C, a seal portion 50A having a desired size can be attached to the object 500. The seal portion 50A is composed of an adhesive layer 60A having substantially the same size, a base material 70A for the seal portion, and a receiving layer 80A on which the thermal transfer image 400 is formed.

The partially sized seal portion 50A attached to the object 500 as shown in FIG. 4C is adhered to the surface of the object 500 via the adhesive layer 60A. By attaching the exposed adhesive layer 60A to the object 500 and applying an appropriate pressure to the surface thereof, a large number of concave shapes 610 existing on the exposed surface of the adhesive layer 60A are elastically deformed, which is similar to the conventional micro suction cup. It is presumed that the object 500 is adsorbed (adhesive) due to such an action.

That is, due to the elastic deformation around the concave shape 610, a force that tries to return from the deformed state to the original shape acts on the concave shape 610, and this force causes the closed space in the concave shape 610 to become a negative pressure. It is presumed that an adsorption action on the object 500 occurs, but it does not necessarily depend on the mechanism. Although the suction force of the concave shape 610 alone is weak, the necessary suction force can be secured as a whole because a large number of concave shapes 610 are formed. Further, when the adhesive layer 60 is manufactured, the adhesive force (adhesive force) of the adhesive layer 60 can be adjusted by adjusting the amount including the concave shape 610 as a parameter, for example, the density.

In this way, the seal portion 50A has sufficient adhesive strength and adheres to the object 500, but if the sticking position is mistakenly pasted at a misaligned position, or to another object. When it is desired to reattach, the adhesive layer 60A has elasticity as described above, and it is considered that the plurality of concave shapes 610 each act as a fine suction cup. Therefore, the seal portion 50A can be relatively easily applied. It can be peeled off from the object 500 and reattached. Further, since it is considered that the plurality of concave shapes 610 each act as a fine suction cup even when the sticker is reattached, the adhesive strength does not decrease due to the reattachment, and the seal portion 50A is relatively firmly made into an object. Can be pasted.

2. 2. Modification Example of the First Embodiment Next, a modification in which the layer structure is slightly different from that of the seal type thermal transfer image receiving sheet 100 of the first embodiment will be described. FIG. 5 is a cross-sectional view illustrating the configuration of the seal-type thermal transfer image receiving sheet 110 showing a modified example of the first embodiment. As shown in FIG. 5, the seal-type thermal transfer image receiving sheet 110 of the present modification is configured by a laminated structure of a lower mold release portion 11 and a seal portion 51 laminated on the upper side of the mold release portion 11. ing.

(A) Release portion As shown in FIG. 5, the release portion 11 has a structure in which the release portion base material 21 and the adhesive layer 61 are laminated in this order from the lower side. That is, in the first embodiment, the adhesive layer 60 laminated on the seal portion 50 side is provided as the adhesive layer 61 on the release portion 11 side in this modification, which is different from the first embodiment. The material composition of the release portion base material 21 and the adhesive layer 61 can be the same as the material composition of the release portion base material 20 and the adhesive layer 60 exemplified in the first embodiment.

(B) Sealing portion The sealing portion 51 is a layer laminated above the release portion 11, and has a configuration in which the release layer 31, the base material 71 for the sealing portion, and the receiving layer 81 are laminated from the lower side. This modification has a laminated structure in which only the arrangements of the release layer 30 and the adhesive layer 60 are replaced with respect to the layer structure of the first embodiment. In this modification, the release portion 11 includes the adhesive layer 61 and the seal portion 51 includes the release layer 31, regardless of whether or not the seal portion 51 has the release layer 31. The seal portion 51 may be provided so as to be detachable from the release portion 11 including the adhesive layer 61. Similar to the seal type thermal transfer image receiving sheet 100 of the first embodiment, the seal portion 51 can be peeled off from the mold release portion 11 after the thermal transfer image is formed on the seal type thermal transfer image receiving sheet 110. This modification can be used, for example, in the field of a so-called decorative sheet in which a portion of a receiving layer 81 having a heat transfer image is adhered to a molded product in order to obtain the design of the molded product. In this case, until the heat transfer image is formed on the receiving layer 81, the seal type heat transfer image receiving sheet 101 is processed to a certain thickness including the release portion 11 in consideration of transportability and processing suitability, and then molded. The mold release portion 11 can be peeled off before being attached to the product to make the seal portion 51 as thin as possible a decorative sheet.

3. 3. Second Embodiment Next, a second embodiment regarding the seal type thermal transfer image receiving sheet of the present disclosure will be described. FIG. 6 is a cross-sectional view illustrating the configuration of the seal type thermal transfer image receiving sheet 120 of the second embodiment. The seal-type thermal transfer image receiving sheet 120 has a structure in which the lower second seal portion 53, the mold release portion 12, and the first seal portion 52 are laminated in this order. In this embodiment, the first seal portion 52 and the second seal portion 53 are provided as seal portions on both the front and back surfaces of the release portion 12 arranged substantially in the center in the vertical direction, and the seal portions are peeled off from both the front and back surfaces. Can be attached to an object.

(A) First Sealing Part As shown in FIG. 6, the first sealing part 52 is a layer laminated above the release portion 12 arranged substantially in the center in the vertical direction, and the adhesive layer 62 from the lower side. The base material 72 for the sealing portion and the receiving layer 82 are laminated in this order. That is, when looking only at the layer structure of the release portion 12 and the first seal portion 52, the layer of the seal type thermal transfer image receiving sheet 100 of the first embodiment is obtained except that the release portion 12 has the release layer 33. It becomes the same as the configuration. After the heat transfer image is formed on the receiving layer 82 side of the seal type heat transfer image receiving sheet 120, the first seal part 52 is peeled off from the mold release part 12, attached to an arbitrary object, and peeled off again. It can be re-pasted. The material composition of the adhesive layer 62, the base material 72 for the sealing portion, and the receiving layer 82 can be the same as the material composition of the adhesive layer 60, the base material 70 for the sealing portion, and the receiving layer 80 illustrated in the first embodiment.

(B) Release part The release part 12 has a structure in which the release layer 33, the base material 22 for the release part, and the release layer 32 are laminated in this order from the lower side. In the first embodiment, the release layer was formed only on one side surface of the release portion base material 20, but in the present embodiment, the first seal portion 52 and the second seal are formed on both sides of the release portion 12. Since the portion 53 is provided, the release layer is also provided on both sides of the release portion base material 22. The material composition of the release part base material 22 and the release layers 32 and 33 can be the same as the material composition of the release part base material 20 and the release layer 30 illustrated in the first embodiment.

(C) Second seal portion The second seal portion 53 is a layer of the release portion 12 laminated on the side opposite to the first seal portion 52, and the receiving layer 83 and the seal portion are formed from the lower side of FIG. The base material 73 and the adhesive layer 63 are laminated in this order. That is, when looking only at the layer structure of the release portion 12 and the second seal portion 53, the layer of the seal type thermal transfer image receiving sheet 100 of the first embodiment except that the release portion 12 has the release layer 32. It becomes the same as the configuration. In other words, the first seal portion 52 and the second seal portion 53 have a layer structure symmetrical to each other, centering on the release portion 12. However, the first seal portion 52 and the second seal portion 53 do not have to have a completely vertically symmetrical layer structure, and a different layer structure is added or deleted from either the first seal portion 52 or the second seal portion 53. The thickness and components of the receiving layer, the base material for the sealing portion, and the adhesive layer constituting the first sealing portion 52 and the second sealing portion 53 may be different from each other.

Since the seal-type thermal transfer image receiving sheet 120 of the second embodiment is provided with the receiving layers 82 and 83 on both the front and back surfaces thereof, thermal transfer images can be formed on both the front and back surfaces of the seal-type thermal transfer image receiving sheet 120. As a result, more seal portions can be formed on the seal-type thermal transfer image-receiving sheet having the same length and area as compared with the case where the thermal transfer image is formed on only one side of the seal-type thermal transfer image-receiving sheet. Further, in the above-mentioned thermal transfer printer 900, if the recording unit 910 is provided at a position corresponding to the front and back surfaces of the seal type thermal transfer image receiving sheet, the front and back images can be formed in one step, and the production efficiency can be improved. ..

4. Third Embodiment Next, a third embodiment of the sealed thermal transfer image receiving sheet of the present disclosure will be described. FIG. 7 is a cross-sectional view illustrating the configuration of the seal type thermal transfer image receiving sheet 130 of the third embodiment. As shown in FIG. 7, the seal-type heat transfer image receiving sheet 130 has a structure in which the mold release portion 15, the second seal portion 55, and the first seal portion 54 are laminated in this order from the lower side. This embodiment has a structure in which a double seal portion is laminated on the same side with respect to the release portion. With such a configuration, the first seal portion 54 is peeled off from the seal type thermal transfer image receiving sheet 130 and attached to a predetermined object, and then the second seal portion 55 is peeled off and superposed on the first seal portion 54. Can be pasted. As a result, the second seal portion 55 can be used as a protective sheet for the first seal portion.

(A) Release portion As shown in FIG. 7, the release portion 15 has a structure in which the release portion base material 25 and the release layer 35 are laminated from the lower side. Since the adhesive layer 65 of the second seal portion 55 abuts on the upper layer of the release layer 35, the second seal portion 55 can be easily peeled off from the release portion 15 or re-adhesive with the abutting portion as an interface. Can be done. The material composition of the release part base material 25 and the release layer 35 can be the same as the material composition of the release part base material 20 and the release layer 30 illustrated in the first embodiment.

(B) First Sealing Part The first sealing part 54 is a layer laminated above the second sealing part 55, which will be described later, and the adhesive layer 64, the base material 74 for the sealing part, and the receiving layer 84 are arranged in this order from the lower side. It has a laminated structure. After the heat transfer image is formed on the receiving layer 84 of the seal type heat transfer image receiving sheet 130, the first seal portion 54 is peeled off from the interface with the second seal portion 55 and attached to an arbitrary object. It can be peeled off and reattached. The material composition of the adhesive layer 64, the base material 74 for the sealing portion, and the receiving layer 84 can be the same as the material composition of the adhesive layer 60, the base material 70 for the sealing portion, and the receiving layer 80 illustrated in the first embodiment.

(C) Second Sealing Part The second sealing part 55 is a layer laminated on the above-mentioned mold release part 15, and the adhesive layer 65, the sealing part base material 75, and the mold release layer 34 are formed from the lower side of FIG. The structure is laminated in this order. The above-mentioned first seal portion 54 is laminated on the upper layer of the release layer 34. As the material composition of the adhesive layer 65, the base material 75 for the seal portion, and the release layer 34, those exemplified for the adhesive layer 60, the base material 70 for the seal portion, and the release layer 30 of the first embodiment can be used. It may be the same material as the first seal portion 54, or it may be a different material. After the first seal portion 54 is attached to the object, the base material 75 for the seal portion and the adhesive layer 65 are formed of a transparent material so that the second seal portion 55 can be used as a protective sheet to be laminated. Is preferable.

Since the seal type thermal transfer image receiving sheet 130 of the third embodiment includes a seal portion having a double structure of the second seal portion 55 and the first seal portion 54 on the upper layer side of the release portion 15, the second seal portion It is preferable that 55 is made of a transparent member. As a result, after the first seal portion 54 is attached to the object, the second seal portion 55 is overlapped with the first seal portion 54 and attached as a protective sheet, whereby the durability and durability of the first seal portion 54 are achieved. The chemical properties and the like can be further improved.

5. Fourth Embodiment Next, a fourth embodiment regarding the seal type thermal transfer image receiving sheet of the present disclosure will be described. FIG. 8 is a cross-sectional view illustrating the configuration of the seal type thermal transfer image receiving sheet 140 of the fourth embodiment. As shown in FIG. 8, the seal type thermal transfer image receiving sheet 140 has a structure in which the release portion 16 and the seal portion 56 are laminated from the lower side. In this embodiment, since the receiving layer 87 is also provided on the mold release portion and the thermal transfer image 420 is also formed on the mold release portion 16 after the seal portion 55 is peeled off, the used used portion is usually to be discarded. The release portion 16 can have added value. Further, since the receiving layer 86 on the sealing portion 55 side and the receiving layer 87 on the release portion 16 side can each form a heat transfer image on demand, further addition is made by associating the front and back images with each other. It can also add value.

Further, it is also possible to use the release portion base material 26 as a transparent base material, form a heat transfer image 420 on the receiving layer 87, and then laminate a printing layer or a base material layer for concealment on the heat transfer image 420. Only when the seal portion 56 is peeled off, the thermal transfer image 420 of the release portion 16 can be visually recognized through the transparent mold release portion base material 26. With such a configuration, for example, a thermal transfer image showing the result of winning or losing the lottery, the winning number, the good or bad of the fortune-telling, etc. can be formed on the receiving layer 87 on demand. Is. The seal-type heat transfer image receiving sheet 140 of the present embodiment differs from the seal-type heat transfer image receiving sheet 100 of the first embodiment only in that an additional receiving layer is provided on the surface on the release portion side. The detailed description will be omitted.

Next, the present invention will be described in more detail with reference to examples.

1. 1. Preparation of Sealed Thermal Transfer Image Receiver Sheet An example in which the sealed thermal transfer image receiving sheet 100 of the first embodiment is actually produced will be shown, and the results of comparison with the comparative example will be described. In the seal-type thermal transfer image receiving sheet 100 of the example, a biaxially stretched PET film having releasability is used as the base material 20 for the mold release portion, and a comma coater (registered trademark) having a clearance of 200 μm on the film is used. The bubble-containing resin composition 600 that had undergone the whipping step was applied using the above. This was dried in a drying oven at 100 ° C. for 1 minute to form an adhesive layer 60, and a base material 70 for a sealing portion on which a receiving layer 80 was laminated was laminated to obtain a sealing type thermal transfer image receiving sheet 100. .. The density of the adhesive layer 60 in this case was 0.39 g / cm ³ , and the thickness was 50 μm.

Note that FIG. 9 is an enlarged photograph of the adhesive layer 60 when the seal portion 50 is peeled off from the seal type thermal transfer image receiving sheet 100 of the example, as viewed from the surface side of the adhesive layer 60, and FIG. 10 is an enlarged photograph of the example. It is an enlarged view in the cross section in the direction orthogonal to the sheet surface of the adhesive layer 60 of the seal type thermal transfer image receiving sheet 100. As shown in FIGS. 9 and 10, a large number of concave shapes 610 are formed in the adhesive layer 60.

On the other hand, as Comparative Example 1, a seal-type heat transfer image receiving sheet prepared in the same manner as in the above-mentioned Example was prepared except that the whipping step was not performed. The density of the adhesive layer after preparation was 0.87 g / cm ³ , and the thickness was 100 μm. As Comparative Example 2, a seal-type heat transfer image receiving sheet (referred to as acrylic adhesive A type) in which an adhesive layer was prepared using SK2094 manufactured by Soken Chemical Co., Ltd., which is an acrylic resin, was prepared. Further, as Comparative Example 3, a seal-type heat transfer image receiving sheet (referred to as acrylic adhesive B type) in which an adhesive layer was prepared using SK1502C manufactured by Soken Chemical Co., Ltd., which is an acrylic resin, was prepared.

2. 2. Measurement results of peeling force for Examples and Comparative Examples The above four types of seal-type heat transfer image receiving sheets were prepared and the peeling force was compared. The peeling force is the result of measuring the peeling force at that time by performing 180 ° peeling at a tensile speed of 300 mm / min using a tensile tester. The peeling force was measured immediately after pasting (0 hours) and 1000 hours after pasting. As a result, the peeling forces of Examples 1, 2 and 3 immediately after pasting (0 hours) were 2.6, 4.9, 5.1 and 5.8 (unit: N / 25 mm), respectively. Yes, the peeling forces of Examples 1, 2 and 3 after 1000 hours of pasting were 5.1, 12.1, 17.3 and 21.5 (unit: N / 25 mm), respectively. It was.

In the examples, it can be seen that the peeling force can be relatively small both immediately after the sticking and after 1000 hours have passed. With this level of peeling force, it will not peel off naturally, and it can be easily peeled off by applying force to peel it off. Moreover, since the adsorption is performed by the concave shape 610, the adhesive layer 60 does not remain on the surface of the object after peeling, and the adhesive force (peeling force) of the adhesive layer 60 itself does not substantially change, so that the adhesive layer 60 is reattached. It was possible to attach it.

On the other hand, in Comparative Example 1, small pieces can be peeled off with a relatively small peeling force, but in the case of a large size, a certain amount of force is required for peeling. In addition, after peeling, the adhesive layer remained on the surface of the object, and complete reattachment was impossible. Further, in Comparative Example 2, in the case of a large size, a certain amount of force is required for peeling, and it is possible to peel off immediately after pasting, but after 1000 hours, the peeling force increases significantly. It was difficult to peel it off manually, and if it was forcibly peeled off, the surface layer sheet might be damaged. Further, in Comparative Example 3, the peeling force was too large immediately after the sticking, and it was difficult to peel the sheet manually, or the surface layer sheet might be damaged if the peeling force was forcibly peeled. Further, neither of Comparative Example 2 and Comparative Example 3 was suitable for reattachment because a part of the adhesive remained on the adherend and the adhesive strength decreased after the peeling. ..

3. 3. Verification experiment on the concave shape of the adhesive layer As described above, in the present disclosure, the concave shape 610 of the adhesive layer 60 has a great influence on the adhesive strength. If the concave shape 610 is not evenly provided on both surfaces of the adhesive layer 60, the adhesive force (adhesive force) of one surface of the adhesive layer may be lower or increased as compared with the other surface. Further, since the concave shape 610 is evenly provided on both surfaces of the adhesive layer 60, the physical properties of the adhesive layer 60 become uniform, and the seal portion 50 and the mold release portion 10 or the object to be attached to the seal portion 50. It is also preferable in terms of exhibiting sufficient adhesive strength to both of the above and removability with the adherend.

In order to evenly provide the concave shape 610 on both surfaces of the adhesive layer 60, it is important to control the coating amount (layer thickness t) of the adhesive layer 60. In this regard, Patent Document 2 (Japanese Unexamined Patent Publication No. 2017-36404) does not consider anything, and it is sufficient that a micro suction cup is simply formed. In Patent Document 2, in FIG. 2 (FIG. 2 of Patent Document 2), which is a cross-sectional photograph of Example 1 formed with a WET thickness of 800 μm, a portion shown as a surface having a micro suction cup has a fine suction cup structure. However, in the part shown as the surface peeled off from the glass substrate, a structure that seems to be a huge bubble that cannot be compared with the fine suction cup structure can be confirmed. That is, in the configuration of Patent Document 2, a micro suction cup (corresponding to the concave shape 610 in the present embodiment) is formed on one surface of the adhesive layer, but a micro suction cup (concave shape 610) is formed on the other surface. Is not roughly formed.

This point was also verified by the applicant. As a verification experiment, samples of four types of adhesive layers were prepared, and concave shapes 610 on both sides were observed by SEM. The samples are Samples 1, 2, 3 and 4, and the layer thickness of each adhesive layer is 25 μm, 30 μm, 35 μm and about 2000 μm. The layer thickness of these samples is after drying. Further, for Samples 1, 2 and 3, the glass surface was coated with the foam-containing resin composition 600 after the foaming treatment using a coater, and the drying treatment was carried out using a drying oven at 100 ° C. Sample 4 was drip-coated on a glass surface and naturally dried at room temperature. The reason why the drying conditions of Sample 4 were changed is to verify the description in Patent Document 2 that normal temperature drying is sufficient. In each sample, the density of the adhesive layer after the foaming treatment was 0.4 g / cm ³ .

FIG. 11 is a diagram showing an observation result of sample 1, and FIG. 12 is a diagram showing an observation result of sample 2. Further, FIG. 13 is a diagram showing the observation result of the sample 3, and FIG. 14 is a diagram showing the observation result of the sample 4. As shown in FIGS. 11, 12, and 13, it was confirmed that the fine concave shapes 610 were uniformly formed on both surfaces of Samples 1 to 3 in which the layer thickness t of the adhesive layer was controlled. On the other hand, in the thick sample 4 shown in FIG. 14, an extreme difference in the size of the concave shape 610 was observed between the dry surface and the glass side surface, and the same result as in FIG. 2 of Patent Document 2 was obtained. Was done. Therefore, in order to evenly provide the concave 610 on both surfaces of the adhesive layer 60, it can be determined that the layer thickness t of the adhesive layer 60 is preferably 20 μm or more and 40 μm or less.

Here, regarding the state in which a plurality of the concave shapes 610 are formed on both sides of the adhesive layer 60 and are evenly provided, it is desirable to satisfy the following relationships in more detail. The average value of the diameters of each opening of the concave shape 610 that opens on the surface on the seal portion 50 side is D ^ave _1, and the average value of the diameters of each opening of the concave shape 610 that opens on the release portion 10 side is D ^{ave 1.} _{When it is 2} ,
｜ D ^ave ₁ − D ^ave ₂ ｜ / D ^ave ₂ ≤ 0.5
It is desirable to satisfy the relationship of.
Also,
｜ D ^ave ₁ − D ^ave ₂ ｜ / D ^ave ₂ ≤ 0.25
It is even more desirable to satisfy the relationship.

By satisfying these relationships, it is possible to reduce the difference in adhesive strength between both sides of the adhesive layer 60, and it is sufficient for both the sealing portion 50 and the mold release portion 10 or the sealing portion 50 and the object. Adhesive strength and removability from an object can be satisfactorily exhibited. Since it is practically impossible to obtain the average value of the diameters of all the openings as the average value of the diameters of the openings, here, the openings having a large diameter within the observation range of 1500 μm × 1100 μm. The diameters of the three openings were measured in order from the beginning, and the average value was used.

Here, when the openings of the samples of FIGS. 11 to 14 were measured and | D ^ave ₁ − D ^ave ₂ | / D ^ave ₂ was obtained, sample 1: 0.04 and sample 2: 0.06 were obtained. , Sample 3: 0.12, Sample 4: 0.69.

10, 11, 12, 15, 16 Release part 20, 21, 22, 25, 26 Base material for release part 30, 31, 32, 33, 34, 35, 36 Release layer 50, 50A, 51, 56 Sealing part 52, 54 First sealing part 53, 55 Second sealing part 60, 60A, 61, 62, 63, 64, 65, 66 Adhesive layer 70, 70A, 71, 72, 73, 74, 75, 76 Sealing part Substrate 80, 80A, 81, 82, 83, 84, 86, 87 Receiving layer 90 Concealing layer 100, 101, 101A, 110, 120, 130, 140 Sealed thermal transfer image receiving sheet 200 Thermal transfer sheet 310, 320 Notch 400, 410, 420 Thermal transfer image 500 Object 600 Resin composition 610 Concave shape 900 Thermal transfer printer 901 Thermal head 902 Platen roll 910 Recording unit

Claims (6)

A seal-type heat transfer image receiving sheet in which the release portion and the seal portion are integrated.
The seal portion is provided so as to be peelable from the release portion, and at least has a structure in which an adhesive layer and a receiving layer capable of forming a thermal transfer image are laminated.
The adhesive layer is arranged so as to face the mold release portion, and has a plurality of concave shapes on both sides thereof.
The average value of the diameters of the concave openings opened on the surface on the mold release portion side is set to D ^ave _1, and the average value of the diameters of the concave openings opened on the receiving layer side is D ^{ave 1.} _{When it is 2} ,
｜ D ^ave ₁ − D ^ave ₂ ｜ / D ^ave ₂ ≤ 0.5
Seal type thermal transfer image receiving sheet that satisfies the relationship. A seal-type heat transfer image receiving sheet in which the release portion and the seal portion are integrated.
The seal portion is provided so as to be detachable from the release portion, and at least includes a receiving layer capable of forming a thermal transfer image.
The release portion comprises at least an adhesive layer and a substrate,
The adhesive layer is arranged so as to face the seal portion and has a plurality of concave shapes on both sides thereof.
The average value of the diameters of the concave openings opened on the surface on the seal portion side is D ^ave _1, and the average value of the diameters of the concave openings opened on the receiving layer side is D ^ave _2. When
｜ D ^ave ₁ − D ^ave ₂ ｜ / D ^ave ₂ ≤ 0.5
Seal type thermal transfer image receiving sheet that satisfies the relationship. The sealed thermal transfer image receiving sheet according to claim 1 or 2, wherein the receiving layer is capable of receiving a sublimation dye. In the seal type thermal transfer image receiving sheet according to any one of claims 1 to 3.
The layer thickness of the adhesive layer shall be 20 μm or more and 40 μm or less.
A seal-type heat transfer image receiving sheet characterized by. In the seal type thermal transfer image receiving sheet according to any one of claims 1 to 4.
The adhesive layer has a plurality of concave shapes based on the bubbles formed on both sides by drying the liquid resin composition containing bubbles.
A seal-type heat transfer image receiving sheet characterized by. In the seal type thermal transfer image receiving sheet according to any one of claims 1 to 5.
When the seal portion is used as the first seal portion, the second seal portion is laminated on the surface of the mold release portion opposite to the surface on which the first seal portion is laminated. Seal type thermal transfer image receiving sheet.