Adhesive sheet and method for producing adhesive sheet

Abstract

To provide an adhesive sheet capable of easily eliminating air accumulation at the boundary with an adherend and facilitating plate inspection.SOLUTION: There is provided an adhesive sheet which comprises a base material layer 11 having transparency and extensibility, an adhesive layer 13 having transparency formed on one surface side of the base material layer 11 in which a groove 131 is formed on the opposite surface side of the base material layer 11 and a printed resin coated film 14 having transparency which is formed so as to fill the groove 131, wherein the groove 131 terminates at an outer periphery of the adhesive layer 13 or is communicated with another groove 131 which terminates at an outer periphery of the adhesive layer 13, the printed resin coated film 14 contains a fluorescent agent and has non-adhesiveness to an adherend to be bonded. Plate inspection can be performed since the printed resin coated film 14 emits light when irradiated with ultraviolet light and the air trapped at the boundary with the adherend can be discharged by using the adhered portion between the printed resin coated film 14 and the adherend as an air passage.SELECTED DRAWING: Figure 1A

Description

[Technical field]

[0001] The present invention relates to an adhesive sheet and a method for producing the adhesive sheet. [Background technology]

[0002] Conventionally, adhesive sheets having an adhesive layer on one side of a base layer have been used as building materials. The adhesive sheet is prone to trapping air at the boundary with the adherend, which tends to reduce design. For this reason, in order to prevent air from being trapped at the boundary with the adherend, a small-area adhesive sheet has been formed and applied to the adherend, or water has been applied to the adherend surface of a large-area adhesive sheet before application to the adherend. In addition, when air is trapped at the boundary with the adherend, a hole has been opened in the part where the air is trapped to allow the air to escape to the outside.

[0003] Furthermore, methods have been proposed in which grooves are formed in the adhesive layer of the adhesive sheet to allow air to escape to the surrounding area, and the adhesive sheet is applied while allowing the air to escape (see, for example, Patent Document 1), as well as methods in which a material is provided to fill the grooves, thereby preventing the grooves from being visible through the sheet (see, for example, Patent Document 2). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 6856163 [Patent Document 2] Patent Publication No. 2022-173875 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the method described above in which the grooves are prevented from being seen by providing a member to fill the grooves, the grooves are not visible, which means that it is not possible to inspect the pressure-sensitive adhesive sheet. Therefore, there has been a demand for a pressure-sensitive adhesive sheet that can easily eliminate air pockets that occur at the boundary with the adherend and that can easily inspect the pressure-sensitive adhesive sheet.

[0006] The present invention has been made in light of the above-mentioned points, and aims to provide an adhesive sheet and a method for manufacturing an adhesive sheet that can easily eliminate air pockets that occur at the boundary with the adherend and that can easily inspect the adhesive sheet. [Means for solving the problem]

[0007] According to one aspect of the present invention, there is provided an adhesive sheet comprising a base layer, an adhesive layer formed on one side of the base layer and having a groove formed on the side opposite the base layer, and a printed resin coating formed to fill the groove, wherein the groove terminates at a peripheral portion of the adhesive layer or is connected to another groove terminated at a peripheral portion of the adhesive layer, and the printed resin coating contains a fluorescent agent, and the adhesive sheet has non-adhesive properties relative to an adherend to be adhered.

[0008] According to another aspect of the present invention, there is provided a method for manufacturing an adhesive sheet including a transparent base layer and a transparent adhesive layer formed on one side of the base layer, the method including the steps of: forming a layer formed on one side of the base layer, the layer being made of a transparent adhesive and having a groove formed on the side opposite the base layer, the groove terminating at an outer periphery of the layer or being arranged so as to communicate with another groove terminating at an outer periphery of the layer; forming a printed resin coating that is transparent and contains a fluorescent agent so as to fill the groove; and, after forming the adhesive layer having the printed resin coating in the groove, irradiating the printed resin coating with ultraviolet light to perform plate inspection. Effect of the Invention

[0009] According to one aspect of the present invention, a pressure-sensitive adhesive sheet can be obtained that can easily eliminate air pockets that occur at the boundary with the adherend and that allows easy plate inspection. [Brief description of the drawings]

[0010] [Figure 1A] 1 is a cross-sectional view illustrating an example of a pressure-sensitive adhesive sheet according to an embodiment of the present invention. [Figure 1B] FIG. 2 is a cross-sectional view showing a schematic example of a pressure-sensitive adhesive sheet according to one embodiment of the present invention during use. [Figure 1C] FIG. 2 is a cross-sectional view showing a schematic example of a pressure-sensitive adhesive sheet according to one embodiment of the present invention during adhesion. [Diagram 2] FIG. 2 is a cross-sectional view illustrating an example of a pressure-sensitive adhesive sheet according to another embodiment of the present invention. [Diagram 3] FIG. 2 is a cross-sectional view illustrating an example of a pressure-sensitive adhesive sheet according to another embodiment of the present invention. [Figure 4] FIG. 2 is a cross-sectional view illustrating an example of a pressure-sensitive adhesive sheet according to another embodiment of the present invention. [Diagram 5] FIG. 2 is a cross-sectional view illustrating an example of a pressure-sensitive adhesive sheet according to another embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] The present invention will be described in detail below. Note that Figs. 1 to 5 are schematic views, and the size and shape of each part are appropriately exaggerated to facilitate understanding. The embodiments shown below are examples of configurations for embodying the technical idea of ​​the present invention, and the technical idea of ​​the present invention is not limited to the materials, shapes, structures, etc. of the components described below. The technical idea of ​​the present invention can be modified in various ways within the technical scope defined by the claims described in the claims.

[0012] Hereinafter, a pressure-sensitive adhesive sheet 1 according to an embodiment of the present invention will be described with reference to Figs. 1A to 1C. FIG. 1 is a cross-sectional view showing a schematic configuration example of an adhesive sheet 1, where FIG. 1A shows the state before being attached to an adherend, FIG. 1B shows the state after the release sheet has been peeled off in preparation for attachment to an adherend, and FIG. 1C shows the state after being attached to an adherend.

[0013] [Configuration of the Adhesive Sheet] The adhesive sheet 1 comprises a base layer 11, a surface protective layer 12 formed on one side of the base layer 11, and an adhesive layer 13 formed on the other side of the base layer 11. In addition, a release sheet 20 is provided on the surface of the adhesive layer 13 opposite the base layer 11. The pressure-sensitive adhesive sheet 1 is preferably transparent. The pressure-sensitive adhesive sheet 1 preferably has a transparency that allows the adherend, which is an article to which the pressure-sensitive adhesive sheet 1 is attached (hereinafter referred to as the adherend), to be visible without impairing the design of the adherend.

[0014] Each layer of the pressure-sensitive adhesive sheet 1 will now be described. [Base material layer] The base layer 11 is a sheet-like member that serves as the base material of the pressure-sensitive adhesive sheet 1 . The base layer 11 is made of a transparent extensible film. As a material for the base layer 11, it is preferable to use a resin having excellent mechanical strength, such as polypropylene, polycarbonate, polyethylene, polyethylene terephthalate, or an acrylonitrile-butadiene-styrene copolymer, and it is more preferable to use a resin having excellent heat resistance and fire resistance, such as polypropylene, polycarbonate, or an acrylonitrile-butadiene-styrene copolymer.

[0015] Here, the transparency of the base layer 11 is preferably such that the adherend can be visually recognized without impairing the design of the adherend. The thickness of the base material layer 11 may be any thickness that provides sufficient physical properties such as strength as the base material of the adhesive sheet 1, while providing stiffness to facilitate application when applying the adhesive sheet 1. Specifically, the thickness of the base material layer 11 is preferably 50 μm or more. Furthermore, since an increase in the thickness of the base material layer 11 leads to a decrease in transparency, and various physical properties such as fire resistance need to be taken into consideration, the thickness of the base material layer 11 is preferably 150 μm or less.

[0016] [Surface protective layer] The surface protective layer 12 is a layer that provides the pressure-sensitive adhesive sheet 1 with functions such as weather resistance, scratch resistance, stain resistance, and design, and protects the base material layer 11. The surface protective layer 12 is provided as the outermost layer on the surface of the base material layer 11 opposite to the surface on which the pressure-sensitive adhesive layer 13 is provided. For example, when a picture pattern layer (not shown) is formed on the surface of the base material layer 11 opposite to the pressure-sensitive adhesive layer 13, the surface protective layer 12 is formed on the surface of the picture pattern layer opposite to the base material layer 11.

[0017] The surface protective layer 12 may be composed of one layer, or may be composed of two or more layers. The surface protective layer 12 has transparency and physical properties necessary for surface protection, such as sufficient strength, stain resistance, weather resistance, etc. Here, the transparency of the surface protective layer 12 is sufficient as long as it allows the design of the adherend to be visually recognized, and the surface protective layer 12 may contain various additives described below within the range of such transparency.

[0018] The surface protective layer 12 preferably contains at least one of resin materials such as a thermosetting resin or an electron beam curable resin such as an ultraviolet curable resin, etc. The surface protective layer 12 may also be made of an acrylic resin, etc. The amount of resin material applied to the surface protective layer 12 is 1.5 g / m 2 More than 7.0g / m 2 Here, the "coating amount" refers to the basis weight after the coating agent is dried by an appropriate method. 2 When the coating amount is 7.0 g / m or more, the surface protection function of the surface protection layer 12 is sufficient. 2 The case where the content is less than this is preferable from the viewpoints of reducing the production cost and fire resistance.

[0019] The surface protective layer 12 may contain an antiviral agent. The antiviral agent is preferably a silver-based material. As the antiviral agent, inorganic antibacterial agents such as antibacterial zeolite, antibacterial apatite, and antibacterial zirconia formed by incorporating any one of metal ions, such as silver ions, copper ions, and zinc ions, into inorganic compounds such as zeolite, apatite, and zirconia can be used. In addition, zinc pyridinone 2-(4-thiazolyl)-benzimidazole, 10,10-oxybisphenoxanodine, organic titanium sulfur halogen system, pyridine-2-thiol-oxide, etc. can be used as the antiviral agent, but silver-based antiviral agents are superior in terms of antiviral effect.

[0020] The amount of the antiviral agent added to the surface protective layer 12 is preferably 0.2 mass% or more and 20 mass% or less. When the amount of the antiviral agent added is 0.2 mass% or more, the antiviral effect of the surface protective layer 12 is improved. When the amount of the antiviral agent added is 20 mass% or less, the scratch resistance of the surface protective layer 12 is improved. The average particle size of the antiviral agent is preferably 1 μm or more and 10 μm or less. When the average particle size of the antiviral agent is 1 μm or more and 10 μm or less, the contact area between the surface protective layer 12 and the antiviral agent is increased, resulting in good antiviral properties.

[0021] It is preferable that the antiviral agent has a plurality of particle diameter peaks. Specifically, it is more preferable that the particle diameter peaks of the antiviral agent include a first peak in the range of 0.5 μm or more and less than 5 μm, and a second peak in the range of 5 μm or more and 15 μm or less. By dispersing the particle diameter peaks of the antiviral agent, the packing density of the antiviral agent is further improved, and it becomes possible to add a larger amount of the antiviral agent. Therefore, the contact area between the resin material and the antiviral agent is enlarged, and the surface area of ​​the antiviral agent itself is also enlarged, thereby improving the antiviral properties.

[0022] The surface protective layer 12 plays an important role in determining the superiority or inferiority of bending workability, weather resistance, scratch resistance, and stain resistance. For this reason, the surface protective layer 12 may contain various additives, such as weather resistance additives, plasticizers, stabilizers, fillers, dispersants, colorants such as dyes and pigments, ultraviolet absorbers, antiblocking agents, catalyst scatterers, light scattering agents, fluorescent agents, luminescent materials, and gloss adjusters, as necessary.

[0023] In addition to the antiviral agent, agents having various functions can be added to the surface protective layer 12. The functionality can be selected from a variety of options, such as antibacterial properties, antiallergenic properties, deodorizing properties, infrared reflection properties, etc., and the surface protective layer 12 may have multiple functions. When forming the surface protective layer 12 as described above, the resin material can be applied by selecting a coating method suited to the purpose, such as gravure printing, offset printing, flexographic printing, or inkjet printing. The surface protective layer 12 is formed by applying the resin material and curing the coating film using a known coating device, heat drying device, ultraviolet ray irradiation device, and electron beam irradiation device suited to the type of resin material. For example, the surface protective layer 12 is formed by applying and drying a coating agent containing a solvent such as methyl ethyl ketone, a urethane resin, and an isocyanate curing agent to the surface of the base layer 11 opposite to the surface on which the adhesive layer 13 is provided, and then curing the coating agent by ultraviolet ray irradiation.

[0024] [Adhesive Layer] The adhesive layer 13 is a layer for imparting adhesiveness to the base layer 11, and is formed on one surface of the base layer 11 (the surface opposite to the surface on which the surface protective layer 12 is formed).

[0025] Any adhesive composition that constitutes the adhesive layer 13 can be used as long as it is transparent and is a material that is used in general adhesive sheets. As an example, it is preferable to use an acrylic pressure-sensitive adhesive that uses acrylic acid or an acrylic ester as a starting material. The transparency of the pressure-sensitive adhesive layer 13 need only be such that the design of the adherend can be visually recognized.

[0026] The thickness of the adhesive layer 13 is preferably 20 μm or more in order to provide ease of application and sufficient adhesive strength. Note that the "thickness of the adhesive layer 13" refers to the thickness of the thickest part of the adhesive layer 13 at the stage after the adhesive composition is applied and then dried. A groove portion 131 is formed on the surface of the adhesive layer 13 opposite to the base layer 11 .

[0027] (Groove) The groove portion 131 is a recess formed on the surface of the pressure-sensitive adhesive layer 13 opposite the base layer 11. It is preferable that a plurality of groove portions 131 are formed on the surface of the pressure-sensitive adhesive layer 13 opposite the base layer 11 over the entire surface of the pressure-sensitive adhesive layer 13.

[0028] Groove portion 131 terminates at the outer periphery of adhesive layer 13 or communicates with other groove portions 131 that terminate at the outer periphery of adhesive layer 13. This allows air trapped between adhesive layer 13 and the adherend to flow out to the periphery of adhesive sheet 1 through gaps formed in groove portions 131 when adhesive sheet 1 is attached to an adherend. The cross-sectional shape of groove portion 131 cut along a plane perpendicular to its extension direction may be any shape as long as it allows the air trapped between the adhesive layer 13 and the adherend to flow out to the periphery of the adhesive sheet 1, and examples of such shapes include a V-shape, a U-shape, a rectangular shape, a trapezoidal shape, a linear shape, etc.

[0029] The depth of the groove 131 may be any depth as long as the air trapped between the adhesive layer 13 and the adherend can flow out to the periphery of the adhesive sheet 1, but for example, it is preferable that the depth is 1 μm or more and 1 μm or more smaller than the thickness of the adhesive layer 13, and more preferably 1 μm or more and 10 μm or more smaller than the thickness of the adhesive layer 13. For example, the depth of the groove 131 is preferably 1 μm or more and 30 μm or less. When the depth of the groove 131 is 1 μm or more, it is preferable because a flow path for flowing air out to the periphery of the adhesive sheet 1 is sufficiently secured. In addition, when the depth of the groove 131 is 10 μm or more smaller than the thickness of the adhesive layer 13, it is preferable because the adhesive layer 13 can have high adhesion to the base layer 11, and when the depth of the groove 131 is 30 μm or less, it is preferable because the adhesive layer 13 can have high adhesion to the base layer 11.

[0030] The grooves 131 are preferably formed, for example, by applying an adhesive composition to one surface of the base layer 11, attaching a release sheet 20 provided with a printed resin coating 14 (described below) having an uneven shape that fits the uneven shape of the grooves 131 to the adhesive composition, and then drying the adhesive composition. This eliminates the need for a step just for forming the grooves 131, and allows the grooves 131 to be formed in an easy and simple manner.

[0031] Alternatively, for example, the adhesive composition may be uniformly applied to one side of the base layer 11, and then the adhesive composition may be embossed using a mold having projections and recesses for forming the grooves 131, thereby forming the grooves 131.

[0032] [Printed resin coating] The printed resin coating 14 is a convex portion that fits into the groove portion 131 provided on the surface of the peelable sheet 20 on the side of the adhesive layer 13. The printed resin coating 14 is formed on one surface of the peelable sheet 20 by using, for example, a printing method. The printed resin coating 14 functions as an air passage and functions as an air vent groove coating layer that covers the inner wall surface of the groove portion 131 that functions as an air vent groove. That is, the printed resin coating 14 is a layer provided so as to cover the inner wall surface of the groove portion 131 while leaving a passage for allowing air to flow out to the periphery of the adhesive sheet 1. Specifically, the printed resin coating 14 is formed of a material that is non-adhesive to the adherend, and when the adhesive sheet 1 is adhered to the adherend, the adhesive layer 13 portion adheres to the adherend and the printed resin coating 14 portion is in a non-adhesive state to the adherend, so that the space between the printed resin coating 14 and the adherend is used as an air passage. Here, the non-adhesiveness of the printed resin coating 14 means that even if it adheres to an adherend, when the adhesive sheet 1 is pressed against the adherend to push out any air trapped at the boundary with the adherend, the adherend and the printed resin coating 14 separate, forming a gap sufficient to push out the trapped air through the gap between them.

[0033] Here, when air trapped at the interface with the adherend is released to the surroundings during application of the adhesive sheet 1, if extremely fine air remains in the flow path inside the printed resin coating 14, i.e., in the gap between the printed resin coating 14 and the adherend, this may cause a decrease in the adhesive strength between the adhesive sheet 1 and the adherend, or the design of the adhesive sheet 1 when viewed from the front side may be impaired. For this reason, by making the shape of the printed resin coating 14 a shape that hydrodynamically improves the flow of air, the prominence of the groove portion 131 can be reduced, and the design of the adhesive sheet 1 when finally finished can be improved. In order to improve the flow of air, it is preferable that the printed resin coating 14 has a shape in which, for example, the end of the printed resin coating 14 has a gradation and the part of the printed resin coating 14 other than the end has a curved surface in a cross section perpendicular to the direction in which the flow path extends. More specifically, it is preferable that the shape of the part of the printed resin coating 14 other than the end has a shape that draws a gentle curve in a cross-sectional view.

[0034] The material constituting the printed resin coating 14 is not particularly limited as long as it has a low adhesiveness to the release sheet 20, i.e., the adhesiveness is such that when the release sheet 20 is peeled off from the adhesive sheet 1, the printed resin coating 14 separates from the release sheet 20 and remains on the adhesive layer 13 side, and on the other hand, it is possible to provide an adhesiveness such that the release sheet 20 does not naturally peel off when stored in a roll, and a pattern having continuous openings can be printed on the release sheet 20. In addition, the material constituting the printed resin coating 14 is a material that can maintain the printed resin coating 14 for a long period of time without being affected by the solvent such as acrylic or toluene of the adhesive composition constituting the adhesive layer 13. For example, the material constituting the printed resin coating 14 can be an acrylic resin or a urethane resin mixed with a solvent such as methyl ethyl ketone. This is because the printability of the printed resin constituting the printed resin coating 14 and the releasability of the printed resin coating 14 from the release sheet 20 when the release sheet 20 is peeled off from the adhesive sheet 1 are high. In addition, it is particularly preferable that the material constituting the printed resin coating 14 contains at least an acrylic resin. By containing an acrylic resin, the solvent resistance of the printed resin coating 14 is improved, so that the printed resin coating 14 is less likely to deteriorate even when stored in contact with the pressure-sensitive adhesive layer 13, and the drying property of the printed resin is improved, so that blocking and traction phenomena are less likely to occur, and the generation of air bubbles due to the evaporation of residual solvent during the formation of the printed resin coating 14 is suppressed. As a result, the design of the pressure-sensitive adhesive sheet 1 is improved.

[0035] The printed resin coating 14 terminates at the outer periphery of the adhesive layer 13 (or the peelable sheet 20) to match the shape of the groove portion 131, or is connected to another printed resin coating 14 that terminates at the outer periphery of the adhesive layer 13 (or the peelable sheet 20). By terminating the printed resin coating 14 at the outer periphery, the adhesive sheet 1 can be adhered to the adherend without allowing air bubbles to enter the interface. Furthermore, by terminating the printed resin coating 14 at the outer periphery, it is possible to prevent any peeling marks from remaining when the adhesive sheet 1 is peeled off, even if a long period of time has passed since the adhesive sheet 1 was adhered.

[0036] If the printed resin coating 14 contains organic particles such as acrylic beads or urethane beads, the non-combustibility of the material required to be non-combustible will decrease. On the other hand, if inorganic particles are added to the printed resin coating 14, the beads or the printed resin coating 14 to which the beads are added will be clearly visible from the surface of the transparent adhesive sheet 1, significantly impairing the design. In order to improve the non-combustibility while allowing the air remaining at the interface with the adherend to escape to the outside, a method other than adding beads is required. Therefore, when forming the printed resin coating 14, a substance with a defoaming effect is intentionally removed to create the printed resin coating 14 containing fine bubbles. The fine bubbles do not impair the shape stability of the printed resin coating 14, and while securing a passage for the remaining air, the non-combustibility is not reduced. In addition, the presence of fine bubbles improves the printing suitability such as drying, and the blocking phenomenon of the printed resin coating is less likely to occur.

[0037] As described above, since the base layer 11 is a sheet-like member having transparency, if the printed resin coating 14 is colored with ink or the like or inorganic particles are added, the printed resin coating 14 is clearly visible from the surface of a transparent adhesive sheet, impairing the design. On the other hand, if the printed resin coating 14 is made only of a highly transparent printing resin, the printed resin coating 14 cannot be properly inspected during printing. In other words, when the printed resin coating 14 is printed on the peelable sheet 20, since the printed resin coating 14 is transparent, it cannot be confirmed visually or with a defect inspection machine during printing. Therefore, for example, during printing, printing defects due to missing or chipped printed resin coating 14 or clogging of the plate cannot be found. Therefore, it is necessary to manufacture the printed resin coating 14 using a method that does not impair the transparency of the printed resin coating 14 and allows plate inspection. Therefore, when printing the resin that will become the printed resin coating 14 on the peelable sheet 20, the fluorescent agent fluorescein is added to this resin, and this resin is used to print the printed resin coating 14. Therefore, when UV light is irradiated in the plate inspection area of ​​the printing press, only the printed resin coating 14 fluoresces and can be confirmed visually or with a defect inspection device, etc., so that plate inspection can be performed and printing defects in the printed resin coating 14 can be found. Therefore, when it is applied as an adhesive sheet, the air removal effect can be maximized.

[0038] By having the groove portion 131 including the printed resin coating 14, the adhesive sheet 1 can be applied to a large-area adherend or to an adherend that is not water-resistant, while improving the design. In addition, such an adhesive sheet 1 can be applied without drilling holes to allow air trapped at the interface between the adhesive sheet 1 and the adherend to escape to the surroundings when it is applied. This prevents water or contaminants from entering the interface between the adhesive sheet 1 and the adherend through holes formed in the adhesive sheet 1, and makes it possible to improve water resistance, contamination resistance, scratch resistance, weather resistance, and the like.

[0039] That is, in this embodiment, when the release sheet 20 is peeled off from the adhesive sheet 1, the printed resin coating 14 remains in the groove 131 because it is made of a material that has low adhesion to the release sheet 20 (FIG. 1B). When the adhesive sheet 1 is attached to an adherend in this state, the adhesive layer 13 is adhered to the adherend, but the groove 131 portion, i.e., the portion of the printed resin coating 14, is not adhered to the adherend, so that the boundary portion between the printed resin coating 14 and the adherend can become a passageway for air. As a result, when air is removed from the air pocket between the adhesive sheet 1 and the adherend, pressure is applied to the air pocket from above the adhesive sheet 1, so that air can escape to the end of the adhesive sheet 1 through the gap between the printed resin coating 14 in the groove 131 and the adherend 30, as shown in FIG. 1C.

[0040] The surface of the printed resin coating 14 opposite the adhesive layer 13 (i.e., the surface facing the adherend 30) is preferably flat. The flat shape referred to here means that when the adhesive layer 13 is adhered to the adherend 30, the portion of the printed resin coating 14 facing the adherend 30 is in close contact with the adherend 30, and air outside the adhesive sheet 1 is unlikely to enter the adhesive sheet 1 through the boundary between the printed resin coating 14 and the adherend 30. This makes it difficult for air to enter between the adhesive sheet 1 and the adherend 30, so that the printed resin coating 14 and the surface of the adherend 30 are in close contact with each other, and the grooves 131 and the printed resin coating 14 are unlikely to be visible from the surface side of the adhesive sheet 1.

[0041] Examples of methods for forming the printed resin coating 14 include methods for forming the printed resin coating 14 on the release sheet 20 using a printing method such as gravure printing, flexographic printing, offset printing, screen printing, rotary printing, and inkjet printing. Also usable are a method for embossing the printed resin coating 14 using a roller-shaped die having a shape that fits into the groove portion 131, and a method for forming the printed resin coating 14 made of resin on the surface of a plastic film or the like serving as the release sheet 20 using a roller-shaped die and a fluid resin composition.

[0042] In order to prevent air bubbles from being mixed in due to foaming of the resin when forming the printed resin film 14, it is preferable to use an ultraviolet-curable resin or an electron beam-curable resin as the curing method for the resin material. Also, by not using a thermosetting resin, it is possible to reduce greenhouse gases that would be generated by heating and drying, making it possible to create environmentally friendly products.

[0043] [Releasable sheet] The release sheet 20 is a sheet-like member that is attached to the adhesive layer 13. The release sheet 20 is a member for preventing the adhesive layer 13 from being exposed before the adhesive sheet 1 is used, and is provided on the surface of the adhesive layer 13 opposite the base layer 11. The release sheet 20 is peeled off from the adhesive layer 13 when the adhesive sheet 1 is used (when attached to the adherend 30). By covering the adhesive layer 13 with the release sheet 20, it becomes possible to laminate or roll the adhesive sheet 1 before use without the adhesive touching parts other than the adhesive sheet 1 or the adhesive layer 13 touching the surface of the adhesive sheet 1.

[0044] The release sheet 20 may be, for example, a laminate in which a release layer mainly made of silicone resin or the like is laminated on the surface of an appropriate substrate such as a plastic film or paper, a polyolefin resin film such as a polyethylene film, or a polyethylene terephthalate resin film. The release sheet 20 is generally often formed with a silicone coat or a fluorine coat to improve the release property, but the release sheet 20 having such a coat layer is expensive. For this reason, instead of a coat layer, an additive such as a release agent is added to the material used for the printed resin coating 14, or a release sheet 20 whose surface is not subjected to a surface treatment such as a corona treatment or an ozone treatment is selected, so that it is possible to control the adhesion between the printed resin coating 14 and the release sheet 20 and the adhesion during storage, even if the surface of the release sheet 20 is not coated with a silicone coat or a fluorine coat.

[0045] In addition, the peelable sheet 20 becomes unnecessary after application and is discarded. However, since the peelable sheet 20 does not require a silicone coating or a fluorine coating to improve peelability, it contributes to reducing waste from the perspective of CO2 emissions, etc., and enables the creation of environmentally friendly products.

[0046] [Method for producing pressure-sensitive adhesive sheet] A method for producing the pressure-sensitive adhesive sheet 1 according to this embodiment will now be briefly described.

[0047] The pressure-sensitive adhesive sheet 1 is formed by laminating a release sheet 20, a pressure-sensitive adhesive layer 13 including a printed resin coating 14, a base layer 11, and a surface protective layer 12 in this order. First, a thermosetting resin or the like is applied to one surface of the base layer 11 by using a printing method such as gravure printing to form the surface protection layer 12. Furthermore, a printed resin coating 14 having protrusions that fit into grooves 131 arranged at predetermined positions is formed on the release sheet 20. The printed resin coating 14 is formed, for example, by using a printing method such as gravure printing, or embossing using a mold.

[0048] Next, a pressure-sensitive adhesive composition that will become the pressure-sensitive adhesive layer 13 is applied to the surface of the base material layer 11 opposite the surface protective layer 12, and the release sheet 20 on which the printed resin coating 14 has been formed is attached to the pressure-sensitive adhesive composition so that the printed resin coating 14 formed on the release sheet 20 faces the pressure-sensitive adhesive composition. The pressure-sensitive adhesive composition is then dried to form the pressure-sensitive adhesive layer 13. As a result, a groove 131 that fits with the printed resin coating 14 is formed, and a pressure-sensitive adhesive sheet 1 in a state in which the groove 131 and the printed resin coating 14 are fitted together is formed.

[0049] [Effects of this embodiment] (1) The adhesive sheet 1 comprises a transparent base layer 11, a transparent surface protection layer 12 formed on one side of the base layer 11, and a transparent adhesive layer 13 formed on the other side of the base layer 11 and having a groove portion 131 formed on the side opposite the base layer 11, and a printed resin coating 14 provided within the groove portion 131 so as to fill the groove portion 131 is transparent and contains a fluorescent agent.

[0050] Because the adhesive sheet 1 is made of a transparent material, it is difficult to inspect the printed resin coating 14 visually or with a defect inspection machine, etc. However, because the printed resin coating 14 contains a fluorescent agent, the printed resin coating 14 can be recognized visually or with a defect inspection machine, etc. by irradiating it with ultraviolet light. As a result, inspection can be easily performed.

[0051] For example, if the entire adhesive sheet 1 does not emit light when irradiated with ultraviolet light, it can be detected that the printed resin coating 14 has been left unprinted. In addition, for example, abnormalities in the printing machine, excess or deficiency of the fluorescent agent contained in the material for forming the printed resin coating 14 can be detected by visually judging whether there is a bias or unevenness in the brightness over the entire adhesive sheet 1, observing visually or with a defect inspection machine whether there are any unprinted lines or broken lines in the printed resin coating 14 printed in a grid pattern, observing under magnification with a defect inspection machine whether the printed resin coating 14 is present but part of it is missing or missing, etc.

[0052] Furthermore, although it contains a fluorescent agent, the printed resin coating 14 is transparent, and the adhesive sheet 1 is formed from a transparent material, so that even when the adhesive sheet 1 is adhered to the adherend 30, the adhesive sheet 1 can prevent a decrease in the design of the adherend 30. In addition, the grooves 131 terminate at the outer periphery of the adhesive layer 13 or communicate with other grooves 131 that terminate at the outer periphery of the adhesive layer 13, and the printed resin coating 14 provided in the grooves 131 is non-adhesive to the adherend 30. Therefore, when the adhesive sheet 1 is adhered to the adherend 30, only the portion excluding the printed resin coating 14 is adhered to the adherend 30, and the printed resin coating 14 is not adhered to the adherend 30. As a result, when air is removed from the air pocket between the adhesive sheet 1 and the adherend 30, pressure is applied to the air pocket from above the adhesive sheet 1, so that air passes between the printed resin coating 14 and the adherend 30 and the air can escape to the end of the adhesive sheet 1. Therefore, it is possible to suppress a decrease in design caused by air pockets.

[0053] (2) In the adhesive sheet 1, the portion of the printed resin coating 14 facing the adherend 30 has a flat shape. This prevents air from entering between the adhesive sheet 1 and the adherend 30, makes it easier for the printed resin coating 14 and the adherend 30 to come into close contact with each other, and makes it difficult for the grooves 131 and the printed resin coating 14 to be visually recognized from the front side of the adhesive sheet 1.

[0054] (3) The surface protective layer 12 is provided on the outermost layer of the substrate layer 11 on the side opposite the pressure-sensitive adhesive layer 13. This makes it possible to improve the weather resistance, scratch resistance, stain resistance, design properties, etc. of the pressure-sensitive adhesive sheet 1.

[0055] (4) A release sheet 20 is provided on the surface of the adhesive layer 13 opposite the base layer 11 so as to cover the adhesive layer 13 and the printed resin coating 14. This makes it possible to prevent unintended substances from adhering to the adhesive layer 13 before using the adhesive sheet 1, and to laminate or rotate the adhesive sheet 1 without the adhesive layer 13 touching the surface of the adhesive sheet 1.

[0056] [Variation 1] In the above-mentioned adhesive sheet 1, the base material layer 11, the surface protective layer 12, the adhesive layer 13, and the printed resin coating 14 are each transparent, and the adhesive sheet 1 is applied to a transparent adhesive sheet 1 that suppresses a decrease in the design of the adherend caused by application of the adhesive sheet 1, but this is not limited to the above.

[0057] For example, if the printed resin coating 14 is inspected before the surface protective layer 12 is laminated, it is possible to laminate a surface protective layer 12 having a design, and each layer does not necessarily have to be transparent as long as the luminescence of the printed resin coating 14 can be detected by irradiating it with ultraviolet light. Furthermore, each layer constituting the adhesive sheet 1 may be colored to such an extent that the luminescence of the printed resin coating 14 can be confirmed during plate inspection.

[0058] [Modification 2] In the above-mentioned adhesive sheet 1, the case where the surface protective layer 12 is provided on the base material layer 11 has been described, but other layers may be provided between the base material layer 11 and the surface protective layer 12.

[0059] For example, as shown in Fig. 2, the adhesive sheet 1A according to the second modification may have a picture pattern layer 15 between the base layer 11 and the surface protective layer 12. This allows the adhesive sheet 1A to be given a desired design. In this case, the picture pattern layer 15 is preferably patterned or colored to such an extent that it does not impair the design of the adherend, and further, when inspecting the picture pattern layer 15 after it is formed, it is preferable that the picture pattern layer 15 has a transparency to such an extent that ultraviolet light caused by ultraviolet irradiation can reach the printed resin coating 14 and the light emitted by the printed resin coating 14 caused by ultraviolet irradiation can be visually observed from the surface protective layer 12 side.

[0060] The following describes the picture pattern layer 15. Note that each layer other than the picture pattern layer 15 is made of the same material as each layer of the adhesive sheet 1, and therefore a description thereof will be omitted.

[0061] [Pattern layer] The picture pattern layer 15 is provided for the purpose of imparting design with a desired pattern to the pressure-sensitive adhesive sheet 1A. Therefore, for example, in the case of a plain decorative sheet intended only for surface coloring or color adjustment, when the above-mentioned purpose is sufficiently achieved by coloring the base layer 11 or forming a concealing solid print layer, or when a pattern is applied to the base layer 11 itself by kneading a pigment or by a sublimable or melt-transferable dye, the picture pattern layer 15 may not be provided. However, in general, the picture pattern layer 15 having an appropriate pattern is often provided on the surface of the base layer 11 by means of a printing method or the like.

[0062] Examples of the pattern include wood grain patterns, stone patterns, fabric patterns, abstract patterns, geometric patterns, letters or symbols, or a combination of a plurality of these. There is no restriction on the material constituting the picture pattern layer 15, and any material that has been used for the picture pattern layer of a conventional pressure-sensitive adhesive sheet can be used as appropriate. Specifically, for example, a printing ink or paint in which a colorant such as a dye or pigment is dissolved or dispersed in a solvent together with a binder resin is used as the material. As the colorant often has different light resistance and weather resistance depending on the combination with the dispersed resin, an ultraviolet absorber or the like can also be used in combination as appropriate.

[0063] As the colorant, organic pigments and inorganic pigments having good light resistance and weather resistance can be used. As the colorant, for example, inorganic pigments such as carbon black, titanium white, zinc white, red iron oxide, Prussian blue, cobalt blue, etc., azo pigments such as diketopyrrolopyrrole pigments, disazo, polyazo, etc., anthraquinone pigments such as anthraquinone red, etc., phthalocyanine pigments such as phthalocyanine blue, phthalocyanine green, etc., quinacridone pigments such as quinacridone red, etc., isoindolinone pigments, perylene pigments such as perylene maroon, perylene red, etc., perinone pigments such as perinone orange, Flavorthrone Yellow pigment, Hansa Yellow pigment, dioxazine pigment, etc., metal powder pigments such as gold powder, silver powder, copper powder, aluminum powder, bronze powder, etc., fish scale powder, basic lead carbonate, bismuth oxide chloride, titanium oxide, titanium oxide-coated mica, etc., pearlescent pigments, etc., or mixtures of two or more selected from these, etc. can be used.

[0064] Examples of the binder resin that can be used include acrylic resins, styrene resins, cellulose resins, polyester resins, urethane resins, polyvinyl resins, alkyd resins, petroleum resins, ketone resins, epoxy resins, melamine resins, fluorine resins, silicone resins, acrylic resins, cellulose derivative resins, polyol resins such as polyvinyl alcohol resins, resins having active hydrogen such as amino resins having an amino group (-NH2) or carboxylic acids having a carboxyl group (-COOH), cellulose derivatives, ethylene-vinyl acetate copolymers, ethylene-vinyl alcohol copolymers, ethylene-vinyl butyral copolymers, and rubber-based resins, as well as mixtures or copolymers of two or more of these.

[0065] In order to provide excellent interlayer adhesion between the base layer 11 and the surface protective layer 12, it is preferable to use a resin with strong adhesiveness and cohesive force as the binder resin of the picture pattern layer 15. As such a resin, it is preferable to use a cross-linking curable resin such as a thermosetting resin or an ionizing radiation curable resin. Among them, it is most preferable to use a urethane-based printing ink containing as the binder resin a two-component curing urethane-based resin composed of the above-mentioned resin and a polyisocyanate resin having an isocyanate group (-NCO). This is because a resin containing as the binder resin a two-component curing urethane-based resin has high cohesive force after cross-linking and curing, while also having moderate flexibility and pliability, and exhibits excellent adhesion to inactive thermoplastic resins such as olefin-based resins.

[0066] Here, in the present embodiment, "containing a two-component curing urethane resin as a main component" means that the two-component curing urethane resin is contained in the largest amount by mass relative to the total mass of the binder resin. The printing ink is not particularly limited, and any known printing ink can be used, so long as printability and weather resistance are taken into consideration. For example, a printing ink containing carbon black as a pigment can be used. In addition, by forming the picture pattern layer 15 with a printing ink containing a combination of pigments, it is possible to enrich the expression of the picture. In addition, by using a printing ink containing an ultraviolet absorber, a light stabilizer, etc., the weather resistance of the picture pattern layer 15 can be improved.

[0067] In addition, various additives such as extender pigments, plasticizers, dispersants, surfactants, adhesion promoters, thixotropic agents, viscosity enhancers, leveling agents, adhesion aids, drying agents, stabilizers, hardeners, hardening accelerators, or hardening retarders may be appropriately added to the printing ink or paint constituting the picture pattern layer 15, as necessary. There is also no limitation on the method of forming the picture pattern layer 15, and any method that has been conventionally applied to the formation of a picture pattern layer of a pressure-sensitive adhesive sheet can be used as appropriate. As a method of forming the picture pattern layer 15, for example, various conventionally known printing methods such as gravure printing, offset printing, screen printing, flexographic printing, electrostatic printing, inkjet printing, etc. can be used. In addition, for example, when the picture pattern layer 15 is formed in a solid state over the entire surface on the base material layer 11, in addition to the above-mentioned methods, various coating methods such as roll coating, knife coating, air knife coating, die coating, lip coating, and flow coating can also be used.

[0068] The thickness of the picture pattern layer 15 is preferably 0.1 μm or more and 10 μm or less, and more preferably 1 μm or more and 8 μm or less. When the thickness of the picture pattern layer 15 is in this range, it is preferable because the adhesion between the base layer 11 and the surface protection layer 12 is improved. Here, the picture pattern layer 15 does not need to be provided on the entire surface of the base layer 11, and may be formed on only a part of the surface of the base layer 11 as long as it expresses the desired picture pattern. Therefore, the "thickness of the picture pattern layer 15" refers to the maximum thickness of the part where the picture pattern layer 15 is formed, i.e., the part where the printing ink is applied and printed.

[0069] [Modification 3] In the above-mentioned pressure-sensitive adhesive sheets 1 and 1A, the base material layer 11 has been described as having a single-layer structure, but the base material layer 11 may be configured by laminating two or more base materials.

[0070] 3, the adhesive sheet 1B according to the third modification may include a base layer 11B in which a first base layer 111 and a second base layer 112 are laminated together. The adhesive sheet 1B includes a picture pattern layer 15, and for example, the picture pattern layer 15 is formed on the first base layer 111, and the second base layer 112 is formed on the first base layer 111 and the picture pattern layer 15.

[0071] The substrate layer 11B of the pressure-sensitive adhesive sheet 1B will now be described. [First base layer] The first base material layer 111 may have a structure similar to that of the base material layer 11 described in the above embodiment. [Second base material layer] Second base material layer 112 is a sheet-like member that, together with first base material layer 111, constitutes base material layer 11B which serves as the base of adhesive sheet 1. Second base material layer 112 is provided on the surface protective layer 12 side of first base material layer 111.

[0072] The first substrate layer 111 and the second substrate layer 112 have transparency that allows the printed resin coating 14, which emits light when irradiated with ultraviolet light, to be visible through the surface protective layer 12, the first substrate layer 111, and the second substrate layer 112. In this case, if a picture pattern layer 15 that allows the printed resin coating 14 to be visible through the first substrate layer 111 is provided on the first substrate layer 111, the picture pattern layer 15 may be inferior in abrasion resistance, scratch resistance, etc. Therefore, in order to protect the picture pattern layer 15, etc., the second substrate layer 112 may be provided so as to cover the picture pattern layer 15.

[0073] As with the first base layer 111, the resin material constituting the second base layer 112 is preferably a resin having excellent mechanical strength such as polypropylene, polycarbonate, polyethylene, polyethylene terephthalate, or an acrylonitrile-butadiene-styrene copolymer, from the standpoints of heat resistance, fire resistance, and mechanical strength, and more preferably a resin having excellent heat resistance and fire resistance such as polypropylene, polycarbonate, or an acrylonitrile-butadiene-styrene copolymer.

[0074] Furthermore, a weather resistance additive such as an ultraviolet absorber may be added to the second base layer 112. By adding a weather resistance additive, the picture pattern layer 15, the first base layer 111, and the underlying pressure-sensitive adhesive layer 13 and printed resin coating 14 can be protected, and the weather resistance can be improved. The second base layer 112 is preferably 50 μm or more and 100 μm or less in order to provide sufficient targeted elasticity and impact resistance while satisfying other physical properties such as fire resistance.

[0075] [Modification 4] In the above-mentioned pressure-sensitive adhesive sheets 1 and 1A, the peelable sheet 20 has been described as having a single-layer structure, but the peelable sheet 20 may be configured by laminating two or more peelable layers.

[0076] For example, as shown in FIG. 3, a pressure sensitive adhesive sheet 1B according to Modification 4 may include a release sheet 20A in which a first release layer 201 and a second release layer 202 are laminated together.

[0077] [Modification 5] Although the pressure-sensitive adhesive sheets 1 to 1B described above are examples of a structure in which the sheet surface is flat, the structure is not limited to this.

[0078] For example, as shown in Fig. 4, the adhesive sheet 1C according to the fifth modification may have embossed irregularities 16 only on the surface protective layer 12 or on both the base layer 11 and the surface protective layer 12. This allows the adhesive sheet 1 to have a three-dimensional design. In addition, for example, when the surface of the adhesive sheet 1C including the picture pattern layer 15 has embossed irregularities 16, it is preferable that the irregularities 16 are provided to match the picture pattern of the picture pattern layer 15. This allows the picture pattern of the picture pattern layer 15 to be expressed three-dimensionally, thereby allowing the adhesive sheet 1C to have a high design.

[0079] Note that Figure 4 shows a cross-sectional view of the adhesive sheet 1 shown in Figure 1A in which unevenness 16 is provided on the surface thereof, but as described above, unevenness 16 may also be provided on the surface of adhesive sheet 1A shown in Figure 2 and 1B shown in Figure 3.

[0080] [Modification 6] Although the pressure-sensitive adhesive sheets 1 to 1C described above show one example in which the surface protective layer 12 has a single-layer structure, the present invention is not limited to this structure.

[0081] 5, an adhesive sheet 1D according to Modification 6 may include a surface protective layer 12D in which a first surface protective layer 121 and a second surface protective layer 122 are laminated. The adhesive sheet 1D may have a configuration in which a second surface protective layer 122 having a relatively high gloss is formed on a part of the uneven shape forming surface of the low-gloss first surface protective layer 121. With this configuration, an adhesive sheet 1D having a gloss matte effect (visual embossed feel) can be obtained.

[0082] The surface protection layer 12D of the pressure-sensitive adhesive sheet 1D will now be described. [First surface protective layer] The first surface protective layer 121 may have the same structure as the surface protective layer 12 having a single layer structure described in the above embodiment. [Second surface protective layer] The second surface protective layer 122 is provided on a part of the uneven surface of the first surface protective layer 121. The second surface protective layer 122 is formed partially on the first surface protective layer 121 to generate a difference in gloss from the first surface protective layer 121 and to express a visual embossed feel by a gloss matte effect.

[0083] The second surface protective layer 122 is formed from a resin material such as an ionizing radiation curable resin or a thermosetting resin, and is preferably formed from an ionizing radiation curable resin. As the ionizing radiation curable resin, the same material as that of the first surface protective layer 121 can be used. From the viewpoint of gloss difference with the first surface protective layer 121, it is preferable to use a thermosetting resin having a urethane bond, such as a two-component curing urethane resin, as the thermosetting resin.

[0084] As the two-component curing urethane resin, for example, a urethane resin containing polyol as a main component and isocyanate as a crosslinking agent (curing agent) can be used. The polyol has two or more hydroxyl groups in the molecule, and examples of the polyol that can be used include polyethylene glycol, polypropylene glycol, acrylic polyol, polyester polyol, polyether polyol, polycarbonate polyol, and polyurethane polyol.

[0085] Also, as the isocyanate, a polyvalent isocyanate having two or more isocyanate groups in the molecule can be used. As the polyvalent isocyanate, for example, aromatic isocyanates such as 2,4-tolylene diisocyanate, xylylene diisocyanate, 4,4'-diphenylmethane diisocyanate, or aliphatic (or alicyclic) isocyanates such as 1,6-hexamethylene diisocyanate, isophorone diisocyanate, hydrogenated tolylene diisocyanate, and hydrogenated diphenylmethane diisocyanate can be used. Also, an adduct or multimer of the above various isocyanates can be used. For example, there are an adduct of tolylene diisocyanate, a tolylene diisocyanate trimer, etc. Among the above isocyanates, aliphatic (or alicyclic) isocyanates are preferable in that they can provide good weather resistance and heat yellowing resistance, and for example, 1,6-hexamethylene diisocyanate can be used.

[0086] The second surface protective layer 122 is partially formed on the first surface protective layer 121, and the area covered can be adjusted depending on the design and the desired performance. The second surface protective layer 122 is preferably provided so as to cover 10% to 90% of the surface of the first surface protective layer 121, and when expressing a gloss matte effect (visual embossed feeling), it is preferably provided so as to cover 10% to 80% of the surface of the first surface protective layer 121. Furthermore, when improvement in scratch resistance, contamination resistance, and oil repellency as the adhesive sheet 1D is required, the second surface protective layer 122 is preferably provided so as to cover 10% to 80% of the surface of the first surface protective layer 121, and more preferably provided so as to cover 10% to 30%.

[0087] The second protective surface layer 122 is formed by applying a resin material to the upper surface of the first protective surface layer 121 by, for example, screen printing, offset printing, gravure printing, or the like, and then curing the resin material. Note that Figure 5 shows a cross-sectional structure in which surface protective layer 12 of adhesive sheet 1D has a two-layer structure, but the flat surface protective layer 12 of adhesive sheet 1 shown in Figure 1, adhesive sheet 1A shown in Figure 2, and adhesive sheet 1B shown in Figure 3 may also have a two-layer structure.

[0088] Also in this case, similarly to the surface protective layer 12, the first surface protective layer 121 and the second surface protective layer 122 may contain an antiviral agent. EXAMPLES

[0089] (A) Example 1 The peelable sheet was subjected to a printing process of a printed resin coating, and the peelable sheet with the printed resin coating thus obtained was evaluated for printability, releasability, solvent resistance, drying conditions, suitability for plate inspection, low visibility of the printed resin coating, air venting effect, and non-flammability. (Example 1-1) An acrylic resin was used as the main component of the printed resin film, and a fluorescent agent was added as an additive, to prepare a resin for forming the printed resin film. Using this resin for forming a printed resin film, a printing process for forming a printed resin film was carried out on a release sheet by gravure printing using a previously formed plate for printing a printed resin film. (Example 1-2) A printing process for printing a printed resin film onto a release sheet was carried out in the same manner as in Example 1-1, except that transparent beads were used instead of the fluorescent agent as an additive for the printed resin film. (Examples 1-3) A printing process for printing a printed resin film onto a release sheet was carried out in the same manner as in Example 1-1, except that inorganic beads were used instead of the fluorescent agent as an additive for the printed resin film. (Examples 1 to 4) A printing process for printing a printed resin film on a release sheet was carried out in the same manner as in Example 1-1, except that ink was added instead of a fluorescent agent as an additive to the printed resin film to color it. (Examples 1 to 5) A printing process for forming a print resin film on a release sheet was carried out in the same manner as in Example 1-1, except that no additive was added. (Examples 1 to 6) A printing process for printing a printed resin film onto a release sheet was carried out in the same manner as in Example 1-1, except that a urethane-based resin was used instead of an acrylic resin as the base material for the printed resin film. (Examples 1 to 7) A printing process for printing a printed resin film onto a release sheet was carried out in the same manner as in Example 1-6, except that transparent beads were used instead of the fluorescent agent as an additive for the printed resin film. (Examples 1 to 8) A printing process for printing a printed resin film on a release sheet was carried out in the same manner as in Example 1-6, except that ink was added instead of a fluorescent agent as an additive to the printed resin film to color it. (Examples 1 to 9) A printing process for forming a print resin film on a release sheet was carried out in the same manner as in Example 1-6, except that no additive was added.

[0090] (Evaluation: Printability) In each example, a printing base paper and a PVC base film were used as the release sheet, and a printed resin film was printed by gravure printing to obtain a release sheet with a printed resin film. The peelable sheets with printed resin coatings of each Example were visually inspected to determine whether the printed resin coatings were formed according to the plate design for printing the printed resin coatings. The evaluation was performed according to the following criteria.

[0091] ◯: The resin for forming the printing resin coating was printed on the printing base paper and PVC base roll according to the plate design, and a printing resin coating was formed. △: There were gaps or chips in the areas where the resin for forming the printing resin coating was supposed to be printed according to the plate design. ×: The resin for forming the printed resin film could not be printed at all, and no printed resin film was formed at all.

[0092] (Evaluation: releasability) In each example, polypropylene laminated paper was used as the release sheet, and a printed resin film was formed on this release sheet by gravure printing and cured to obtain a release sheet with a printed resin film. After attaching cellophane tape to this release sheet with a printed resin film and pressing it, the cellophane tape was peeled off, and the releasability of the printed resin film was visually evaluated. The evaluation was performed according to the following criteria.

[0093] ◯: The printed resin film was completely peeled off and adhered to the cellophane tape. Δ: The printed resin coating was not completely peeled off by peeling off the cellophane tape once, but by repeating the process of applying, pressing and peeling off the cellophane tape several times, the printed resin coating was completely peeled off. ×: The printed resin film did not peel off at all.

[0094] (Evaluation: Solvent resistance) In each example, polypropylene laminated paper was used as the release sheet, and a printed resin coating was formed on this release sheet by gravure printing, and then cured to obtain a release sheet with a printed resin coating. The surface of this release sheet with a printed resin coating was lightly rubbed with a cloth soaked in a specific solvent, and it was visually confirmed whether peeling, gloss change, dissolution, etc. of the printed resin coating occurred. Ethanol and methyl ethyl ketone were used as solvents, and peeling of the printed resin coating, etc. was evaluated for each solvent. The evaluation was performed according to the following criteria.

[0095] ◯: No significant change occurred in the printed resin coating in any of the solvents. Δ: When either one of the solvents was used, a slight change in gloss occurred in the printed resin film. ×: The printed resin film peeled off in both solvents.

[0096] (Evaluation: Drying conditions) In each example, a printed resin film was formed on a release sheet by a gravure printer, and the sheet was cured to obtain a release sheet with a printed resin film. The release sheet with the printed resin film was visually inspected to see if it was dried to such an extent that blocking did not occur, and if the printed resin film was attached to the roll of the printer, causing a drag phenomenon. The evaluation was performed according to the following criteria.

[0097] ◯: Neither blocking nor roll tracking occurred. Δ: Somewhat uncured, and blocking was observed. ×: Drying was obviously insufficient, and significant blocking was observed.

[0098] (Evaluation: Suitability for plate inspection) In each example, a printed resin film was formed on a release sheet by a gravure printer, and the sheet was cured to obtain a release sheet with a printed resin film. When the printed resin film was printed on the release sheet with the printed resin film by the gravure printer, the release sheet with the printed resin film was irradiated with ultraviolet light at the exit of the print from the gravure printer, and an operator visually or by using a camera or device such as a defect inspection machine confirmed whether the printed resin film was printed on the release sheet. Evaluation was performed according to the following criteria.

[0099] ◯: The printed resin coating was clearly visible and printing defects were also discovered. △: The printed resin coating was visible, but in some cases it was difficult to see due to the printing speed. ×: The printed resin film was not visible at all, and no printing defects were found.

[0100] (Evaluation: Low visibility of printed resin coating) In each example, a printed resin film was formed on a release sheet to obtain a release sheet with a printed resin film. The adhesive layer side of a laminate of a substrate layer and an adhesive layer was placed opposite the printed resin film side of a release sheet with a printed resin film, and the laminate was bonded together to produce a transparent adhesive sheet in which the adhesive layer including the printed resin film formed on the release sheet and the substrate layer were laminated in this order.

[0101] The release sheet was peeled off from this pressure-sensitive adhesive sheet 1, and the pressure-sensitive adhesive layer side was attached to a black board, and it was visually confirmed whether the shape of the printed resin coating was clearly visible. The evaluation was performed according to the following criteria.

[0102] ○: Although there are some parts that are very slightly visible, there is no sense of incongruity that impairs the design. △: The shape of the printed resin coating is visible if you look closely. ×: The shape of the printed resin coating is clearly visible.

[0103] (Evaluation: Air removal effect) In each example, a printed resin coating was formed on a release sheet to obtain a release sheet with a printed resin coating. The adhesive layer side of a laminate of a substrate layer and an adhesive layer was faced to the printed resin coating side of a release sheet with a printed resin coating, and the laminate was bonded to produce an adhesive sheet in which the adhesive layer including the printed resin coating formed on the release sheet and the substrate layer were laminated in this order.

[0104] The release sheet was peeled off from this pressure-sensitive adhesive sheet, and the pressure-sensitive adhesive layer side was attached to an adherend, and it was confirmed whether the air remaining between the adherend and the pressure-sensitive adhesive layer could be released to the outside by pressing the pressure-sensitive adhesive layer to the adherend. Evaluation was performed according to the following criteria.

[0105] ○: When compressed, the remaining air was able to escape. △: When compressed, the remaining air can be released to the outside, but there are some areas where it is difficult to escape and there is still very small air remaining. ×: Even when pressed, the remaining air could not be released at all.

[0106] (Rating: Non-flammable) In each example, a printed resin film was formed on a release sheet to obtain a release sheet with a printed resin film. In addition, a non-flammable substrate, specifically a gypsum board, was used as the substrate layer, and the substrate layer and the adhesive layer were laminated with the printed resin film side of the release sheet with a printed resin film, and the laminate was laminated with the adhesive layer side of the laminate of the substrate layer and the adhesive layer, and the printed resin film side of the release sheet with a printed resin film was laminated in this order to prepare a pressure-sensitive adhesive sheet including a laminate of the adhesive layer including the printed resin film formed on the release sheet and the substrate layer.

[0107] This adhesive sheet with a peelable sheet was tested to see if it met the following requirements in a heat generation test using a cone calorimeter tester in accordance with ISO5660-1, the fire resistance test method based on Article 2, Paragraph 9 of the Building Standards Act and Article 108-2 of the Enforcement Order of the Building Standards Act, and the performance evaluation standard.

[0108] 1. Total calorific value is 8MJ / m 2 below 2. The maximum heat generation rate is 200kW / m for 10 seconds or more. 2 not exceed. 3. No cracks or holes that penetrate to the back surface and are harmful to fire prevention will occur.

[0109] The evaluation was carried out according to the following criteria. ○: Meets all 1 to 3. △: Any of 1 to 3 is not met. ×: Does not meet all of 1 to 3.

[0110] The evaluation results are shown in Table 1 below.

[0111] [Table 1]

[0112] As can be seen from Table 1, all of the printed resin coated peelable sheets of Examples 1-1 to 1-9 were good in terms of printability, releasability, solvent resistance, and air removal effect, but the drying conditions were evaluated differently depending on whether the main agent of the printed resin coating was a urethane resin or an acrylic resin, and the suitability for plate inspection, low visibility of the printed resin coating, and non-flammability were evaluated differently depending on the type of additives in the printed resin coating. As a result, it was confirmed that good results were obtained when the main agent of the printed resin coating was an acrylic resin or a urethane resin and a fluorescent agent was added as an additive. (B) Example 2 The printed resin film was printed on a release sheet using an acrylic resin as the main agent and a fluorescent agent as an additive for the printed resin film, to obtain a release sheet with a printed resin film. The release sheet with the printed resin film was evaluated for suitability for plate inspection. (Example 2-1) A resin for forming a printed resin coating, which is made of an acrylic resin as a base material and a fluorescent agent as an additive, was used, and a pre-formed plate for printing the printed resin coating was used to print a printed resin coating on a release sheet by gravure printing, thereby obtaining a release sheet with a printed resin coating.

[0113] The amount of fluorescent agent added in the printed resin film was 0%. (Example 2-2) A printed resin film was printed on a release sheet in the same manner as in Example 2-1, except that the amount of the fluorescent agent added in the printed resin film was 0.01%, to obtain a release sheet with a printed resin film. (Example 2-3) A printed resin film was printed on a release sheet in the same manner as in Example 2-1, except that the amount of the fluorescent agent added in the printed resin film was 0.10%, to obtain a release sheet with a printed resin film. (Examples 2-4) A printed resin film was printed on a release sheet in the same manner as in Example 2-1, except that the amount of the fluorescent agent added in the printed resin film was 0.50%, to obtain a release sheet with a printed resin film. (Examples 2-5) A printed resin film was printed on a release sheet in the same manner as in Example 2-1, except that the amount of the fluorescent agent added in the printed resin film was 1.00%, to obtain a release sheet with a printed resin film. (Examples 2-6) A printed resin film was printed on a release sheet in the same manner as in Example 2-1, except that the amount of the fluorescent agent added in the printed resin film was 10.00%, to obtain a release sheet with a printed resin film. (Evaluation: Suitability for plate inspection) For the release sheets with printed resin coating in each example, when the printed resin coating was printed by a gravure printing machine, the release sheets with printed resin coating were irradiated with ultraviolet light at the exit of the print from the gravure printing machine, and an operator visually or by using a camera or device such as a defect inspection machine confirmed whether the printed resin coating was printed on the release sheet. Evaluation was performed according to the following criteria.

[0114] ◯: The printed resin coating was clearly visible and printing defects were also discovered. △: The printed resin coating was visible, but in some cases it was difficult to see due to the printing speed. ×: The printed resin film was not visible at all, and no printing defects were found. The evaluation results are shown in Table 2 below.

[0115] [Table 2]

[0116] From Table 2, it can be seen that when only a small amount of fluorescent agent is added (approximately 0% or 0.01%), the printing resin coating is completely invisible and the suitability for plate inspection is poor, but when 0.10% or more of fluorescent agent is added, relatively good evaluation results can be obtained.

[0117] The present invention can have the following configurations, for example. (1) A base layer; a pressure-sensitive adhesive layer formed on one surface of the base material layer and having a groove formed on a surface opposite to the base material layer; a printed resin coating formed so as to fill the groove portion; Equipped with the groove portion terminates at an outer circumferential portion of the pressure-sensitive adhesive layer or communicates with another groove portion that terminates at an outer circumferential portion of the pressure-sensitive adhesive layer; The printed resin coating contains a fluorescent agent and has non-adhesive properties with respect to an adherend to be adhered thereto. (2) The pressure-sensitive adhesive sheet according to (1) above, wherein the region of the printed resin coating that faces the adherend has a flat shape. (3) The pressure-sensitive adhesive sheet according to (1) or (2) above, wherein the base layer, the pressure-sensitive adhesive layer, and the printed resin coating each have transparency. (4) The pressure-sensitive adhesive sheet according to any one of (1) to (3) above, wherein the fluorescent agent emits light upon irradiation with ultraviolet light. (5) The pressure-sensitive adhesive sheet according to any one of (1) to (4) above, further comprising a transparent surface protective layer formed on the outermost layer on the other side of the base layer. (6) The pressure-sensitive adhesive sheet according to any one of (1) to (5) above, further comprising a release sheet provided on the side of the pressure-sensitive adhesive layer opposite the base layer. (7) A transparent substrate layer; a transparent pressure-sensitive adhesive layer formed on one surface of the base layer; A method for producing a pressure-sensitive adhesive sheet comprising: forming a layer made of a transparent adhesive formed on one surface of the base layer and having grooves formed on the surface opposite to the base layer, the grooves terminating at an outer periphery of the layer or being provided so as to communicate with other grooves terminating at an outer periphery of the layer; forming a printing resin coating having transparency and containing a fluorescent agent so as to fill the grooves; a step of forming the pressure-sensitive adhesive layer having the printed resin film in the groove portion, and then irradiating the printed resin film with ultraviolet light to perform a plate inspection; A method for producing a pressure-sensitive adhesive sheet, comprising: [Explanation of symbols]

[0118] 1 Adhesive sheet 11 Base material layer 12 Surface protective layer 13 Adhesive layer 14 Printed resin coating 20 Peelable sheet 30 Adherent

Claims

1. A base layer; a pressure-sensitive adhesive layer formed on one surface of the base material layer and having a groove formed on a surface opposite to the base material layer; a printed resin coating formed so as to fill the groove portion; Equipped with the groove portion terminates at an outer circumferential portion of the pressure-sensitive adhesive layer or communicates with another groove portion that terminates at an outer circumferential portion of the pressure-sensitive adhesive layer; The printed resin coating contains a fluorescent agent and has non-adhesive properties with respect to an adherend to be adhered thereto.

2. 2. The pressure-sensitive adhesive sheet according to claim 1, wherein the printed resin coating has a flat area facing the adherend.

3. The pressure-sensitive adhesive sheet according to claim 2 , wherein the base layer, the pressure-sensitive adhesive layer, and the printed resin film each have transparency.

4. The pressure-sensitive adhesive sheet according to claim 3 , wherein the fluorescent agent emits light when irradiated with ultraviolet light.

5. The pressure-sensitive adhesive sheet according to claim 4 , further comprising a transparent surface protective layer formed on the outermost layer on the other surface side of the base layer.

6. The pressure-sensitive adhesive sheet according to claim 5 , further comprising a release sheet provided on the side of the pressure-sensitive adhesive layer opposite to the base layer.

7. A transparent substrate layer; a transparent pressure-sensitive adhesive layer formed on one surface of the base layer; A method for producing a pressure-sensitive adhesive sheet comprising: forming a layer made of a transparent adhesive formed on one surface of the base layer and having grooves formed on the surface opposite to the base layer, the grooves terminating at an outer periphery of the layer or being provided so as to communicate with other grooves terminating at an outer periphery of the layer; forming a printing resin coating having transparency and containing a fluorescent agent so as to fill the grooves; a step of forming the pressure-sensitive adhesive layer having the printed resin film in the groove portion, and then irradiating the printed resin film with ultraviolet light to perform plate inspection; A method for producing a pressure-sensitive adhesive sheet, comprising:

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