Case, dispenser and adhesive sheet

Abstract

To provide a case of which positioning with respect to an object is easy, and which can be repeatedly attached and re-peeled, to provide a dispenser and to provide an adhesive sheet.SOLUTION: A case includes: a case body for storing an article; and an adhesive sheet provided on an outer surface of the case body. The adhesive sheet includes an adhesive layer having a fine structure on the surface. A surface on the opposite side from the surface of the adhesive layer faces the outer surface. The fine structure includes a plurality of convex type structures. The convex type structure includes two or more portions. A first portion existing at an apex of the convex type structure is made of a material which has a non-adhesive property or a first adhesive property. A second portion existing farther from the apex than the first portion is made of a second adhesive material which has an adhesive property higher than the material of the first portion.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present disclosure relates to a case, a dispenser, and an adhesive sheet. [Background technology]

[0002] Patent Document 1 discloses a tape or sheet dispenser, which allows the tape or sheet contained in the dispenser to be taken out from an outlet of the dispenser. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 7-149380 Summary of the Invention [Problem to be solved by the invention]

[0004] When the tape or sheet is taken out from the dispenser outlet, double-sided tape may be attached to the bottom of the dispenser to prevent the dispenser from lifting up together with the tape or sheet. In this case, the dispenser can be attached to a desk using the double-sided tape. However, it is difficult to adjust the position of the dispenser using the adhesive double-sided tape, and it is difficult to repeat the operation of attaching the dispenser to the desk, peeling it off from the desk, and attaching it again to another location. A dispenser is an example of a case for storing items.

[0005] One aspect of the present disclosure is to provide a case, dispenser and adhesive sheet that can be easily adjusted to a position relative to an object and can be repeatedly attached and removed. [Means for solving the problem]

[0006] A case according to one aspect of the present disclosure comprises a case body for storing an item, and an adhesive sheet provided on an outer surface of the case body, the adhesive sheet having an adhesive layer with a microstructure on its surface, the surface of the adhesive layer opposite the surface facing the outer surface, the microstructure including a plurality of convex structures, the convex structures having two or more portions, a first portion present at the top of the convex structures being made of a non-adhesive or first adhesive material, and a second portion present farther from the top than the first portion being made of a second adhesive material having higher adhesiveness than the material of the first portion.

[0007] The adhesive sheet may further include a cushion layer provided on the surface opposite to the surface of the adhesive layer.

[0008] The adhesive sheet may extend in a first direction on the outer surface of the case body, and a width of the adhesive sheet at one end in the first direction may be smaller than a width of the adhesive sheet at a center in the first direction.

[0009] A dispenser according to one aspect of the present disclosure is a sheet-like article that can be separated into a plurality of parts, and is a dispenser for supplying portions separated from the sheet-like article, the sheet-like article comprising a base sheet and an adhesive layer provided on at least a portion of a surface of the base sheet, in the above case.

[0010] The sheet-like article may be an adhesive tape.

[0011] The sheet-like article may be a laminate including a plurality of stacked sticky notes.

[0012] An adhesive sheet according to one aspect of the present disclosure comprises an adhesive layer having a microstructure on its surface, and a cushion layer provided on the side of the adhesive layer opposite the surface, the microstructure including a plurality of convex structures, the convex structures having two or more portions, a first portion at the top of the convex structures being made of a non-adhesive or first adhesive material, and a second portion below the first portion being made of a second adhesive material having higher adhesiveness than the material of the first portion.

[0013] The adhesive layer may be a first adhesive layer and the cushioning layer may comprise a second adhesive layer of a third adhesive material different from the second adhesive material.

[0014] An adhesive sheet according to one aspect of the present disclosure comprises an adhesive layer having a microstructure on a surface, the microstructure including a plurality of convex structures, the convex structures having two or more portions, a first portion at the top of the convex structures being made of a non-adhesive or first adhesive material, a second portion below the first portion being made of a second adhesive material having higher adhesiveness than the material of the first portion, and the second portion constituting a cushion layer located on the side of the adhesive layer opposite the surface. Effect of the Invention

[0015] According to one aspect of the present disclosure, a case, dispenser and adhesive sheet can be provided that can be easily adjusted in position relative to an object and can be repeatedly attached and removed. [Brief description of the drawings]

[0016] [Figure 1] FIG. 2 illustrates a side view of a dispenser according to one embodiment. [Diagram 2] FIG. 2 shows the bottom view of the dispenser of FIG. [Diagram 3] FIG. 13 is a diagram showing the bottom view of a dispenser equipped with an adhesive sheet according to a modified example. [Figure 4] FIG. 2 is a perspective view of an adhesive sheet according to one embodiment. [Diagram 5] FIG. 5 is a cross-sectional view taken along line VV in FIG. [Figure 6] FIG. 4 is a cross-sectional view of an adhesive sheet according to another embodiment. [Figure 7] FIG. 4 is a cross-sectional view of an adhesive sheet according to another embodiment. [Figure 8] FIG. 4 is a cross-sectional view of a portion of an adhesive sheet according to another embodiment. [Figure 9] FIG. 11 is a cross-sectional view showing another example of a cone structure. [Figure 10] FIG. 11 is a cross-sectional view showing another example of a frustum structure. [Figure 11] FIG. 11 is a perspective view of an adhesive sheet according to another embodiment. [Figure 12] 7A to 7C are cross-sectional views showing steps in a method for producing the adhesive sheet of FIG. [Figure 13] 13 is a cross-sectional view showing a step subsequent to the step in FIG. 12. [Figure 14] 14 is a cross-sectional view showing a step subsequent to the step in FIG. 13. [Figure 15] 7A to 7C are cross-sectional views showing a process of attaching a dispenser provided with the adhesive sheet of FIG. 6 to an object. [Figure 16] FIG. 11 is a cross-sectional view showing a dispenser according to another embodiment. [Figure 17] FIG. 2 is a cross-sectional view showing a case according to one embodiment. [Figure 18] 1 is a graph showing the relationship between load and peel force. [Figure 19] 1 is a graph showing the relationship between load and peel force. [Figure 20] 1 is a graph showing the relationship between the number of repetitions and the peel force. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Hereinafter, an embodiment of the present disclosure will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same or equivalent elements are designated by the same reference numerals, and duplicated descriptions are omitted. In the drawings, an XYZ orthogonal coordinate system is shown as necessary.

[0018] Fig. 1 is a diagram showing a side view of a dispenser according to an embodiment. Fig. 2 is a diagram showing a bottom view of the dispenser of Fig. 1. The dispenser 40 shown in Fig. 1 includes a case body (also called a housing) 42 for storing a tape-like article 44 (sheet-like article), and an adhesive sheet 10 provided on a bottom surface 42s (outer surface) of the case body 42. The tape-like article 44 is an example of a sheet-like article that can be separated into a plurality of parts. The dispenser 40 can supply a part 44a separated from the tape-like article 44 to a user.

[0019] The tape-like article 44 includes a base sheet 44s and an adhesive layer 44t provided on at least a portion of the surface of the base sheet 44s. In this embodiment, the adhesive layer 44t is provided on the entire surface of the base sheet 44s. The tape-like article 44 is a rolled body (roll-like article) that is wound with the adhesive layer 44t on the inside. The tape-like article 44 does not necessarily have to have the adhesive layer 44t.

[0020] The case body 42 is, for example, a plastic molded product. The bottom surface 42s of the case body 42 extends in the X-axis direction and the Y-axis direction. The bottom surface 42s has, for example, a rectangular shape with the X-axis direction as the longitudinal direction and the Y-axis direction as the transverse direction. The case body 42 has a side surface 42t connected to an edge (a side extending in the X-axis direction) of the bottom surface 42s. The side surface 42t extends in the X-axis direction and the Z-axis direction. For example, a circular opening 42h is provided in the side surface 42t. A cylindrical portion protruding in the Y-axis direction is connected to the edge of the opening 42h, and the tape-like article 44 is wound around the cylindrical portion. The case body 42 is provided with a blade 46 for separating the tape-like article 44 into a plurality of portions 44a and 44b. At one end of the tape-like article 44, an adhesive layer 44t is adhered to the blade 46. When the user removes one end of the tape-like article 44 from the blade 46 and pulls it, the one end of the tape-like article 44 is unwound from the dispenser 40. Thereafter, the user holds the one end of the tape-like article 44 and presses it down in the Z-axis direction, causing the blade 46 to cut the tape-like article 44 at the separation points CT between the multiple portions 44a, 44b. This separates the portion 44a from the portion 44b.

[0021] The adhesive sheet 10 has an adhesive layer 12 having a microstructure 13 on a surface 12a. A back surface 12b (the surface opposite to the front surface 12a) of the adhesive layer 12 faces the bottom surface 42s of the case body 42. In this embodiment, the back surface 12b of the adhesive layer 12 is adhered to the bottom surface 42s of the case body 42. The adhesive sheet 10 may be provided on a side surface 42t of the case body 42. The adhesive sheet 10 may be adhered to any surface of the outer surface of the case body 42 other than the bottom surface 42s and the side surface 42t.

[0022] FIG. 2 is a diagram showing the bottom surface of the dispenser in FIG. 1. As shown in FIG. 2, the adhesive sheet 10 has, for example, a rectangular shape when viewed in the thickness direction (Z-axis direction) of the adhesive sheet 10. The adhesive sheet 10 extends in the X-axis direction (first direction) on the bottom surface 42s of the case main body 42. As shown in (a) to (d) of FIG. 3, the width of the adhesive sheet 10 at one end 10e in the X-axis direction may be smaller than the width of the adhesive sheet 10 at the center 10m in the X-axis direction. The center 10m is the center of the length of the adhesive sheet 10 in the X-axis direction. The shape of the adhesive sheet 10 shown in (a) of FIG. 3 is a triangle. The shape of the adhesive sheet 10 shown in (b) of FIG. 3 is a rhombus. The shape of the adhesive sheet 10 shown in (c) of FIG. 3 is an octagon. The shape of the adhesive sheet 10 shown in (d) of FIG. 3 is an ellipse.

[0023] FIG. 4 is a perspective view of an adhesive sheet according to an embodiment. FIG. 5 is a cross-sectional view taken along line VV in FIG. 4. The adhesive layer 12 of the adhesive sheet 10 shown in FIG. 4 and FIG. 5 does not have a microstructure on the back surface 12b. The front surface 12a and the back surface 12b extend along a plane (e.g., the XY plane) perpendicular to the thickness direction (e.g., the Z-axis direction) of the adhesive layer 12. The microstructure 13 includes a plurality of pyramidal structures 31. The pyramidal structure 31 may be replaced with a frustum structure 131 (FIG. 8) or a rib structure 231 (FIG. 11) described later. The pyramidal structure 31, the frustum structure 131, and the rib structure 231 are each an example of a convex structure (convex body). In this specification, a "convex structure" is generally a three-dimensional figure that has an arbitrary planar figure as a base and is configured by connecting all points on the side of the base to all points on the side of another arbitrary planar figure or a straight line (top) that is not in the same plane. Preferably, the area of ​​the top of the convex structure is smaller than the area of ​​the base. More preferably, the convex structure has a shape tapering from the bottom surface to the top. The plurality of pyramidal structures 31 are arranged in a lattice pattern along the X-axis direction and the Y-axis direction on the surface 12a. The X-axis direction and the Y-axis direction in FIG. 4 and FIG. 5 may not coincide with the X-axis direction and the Y-axis direction in FIG. 1 and FIG. 2. FIG. 5 is a cross-sectional view passing through the apex of the plurality of pyramidal structures 31 arranged along the X-axis direction. The plurality of pyramidal structures 31 may be arranged regularly or irregularly, preferably on a plane. The area of ​​the pyramidal structure 31 projected onto a plane perpendicular to the height direction of the pyramidal structure 31 (the area of ​​the base surface 1 of the pyramidal structure 31) may be 10 square μm or more, and may be 10,000 square μm or less.

[0024] Each pyramidal structure 31 has a base 1, an apex 2, and a plurality of side surfaces 3 connecting the edge of the base 1 and the apex 2. The base 1 has any planar shape such as a circle (including an ellipse) or a polygon. The shape of the pyramidal structure 31 may be, for example, a cone, a triangular pyramid, a square pyramid, or a hexagonal pyramid. In the example shown in FIG. 4 and FIG. 5, the shape of the pyramidal structure 31 is a square pyramid. The shapes of the pyramidal structures 31 may be the same or different, but it is preferable that they have substantially the same height (for example, the difference is within ±5%, ±3%, or ±1%), and it is more preferable that they all have substantially the same shape. When pyramidal structures 31 with different shapes are present, it is preferable that the microstructure 13 is composed of 10 or less types, 9 or less types, 8 or less types, 7 or less types, 6 or less types, 5 or less types, 4 or less types, 3 or less types, or 2 or less types of pyramidal structures 31. Two or more of the pyramidal structure 31, the frustum structure 131 (FIG. 8) and the rib structure 231 (FIG. 11) may coexist.

[0025] Each pyramidal structure 31 includes a first portion 4 located at the apex 2 of the pyramidal structure 31 and a second portion 5 located below (on the bottom surface 1 side) the first portion 4. The second portion 5 is located farther from the apex 2 than the first portion 4.

[0026] The apex 2 is a portion that substantially occupies the highest region of the cone structure 31 (the portion of the cone structure 31 that first comes into contact with the object (also referred to as the adherend) when the adhesive sheet of the present disclosure approaches the object). The apex 2 preferably includes the apex of the cone structure 31. Substantially occupying means that it is acceptable for a small portion to have a different material attached or mixed therein. For example, the first portion 4 may occupy a large portion (e.g., 90% or more, or 95% or more) of the highest region of the cone structure 31. Even if a small amount of filler or the like is contained in that region, the filler or the like does not fall under the first portion 4. The first portion 4 supports the adhesive sheet 10 when the pressure applied to the adhesive sheet 10 is low, thereby providing the adhesive sheet 10 with slidability. When the pressure applied to the adhesive sheet 10 reaches or exceeds a certain level, the second part 5 itself deforms, the first part 4 deforms, or the first part 4 is absorbed into the second part 5, thereby coming into contact with the object and providing adhesion.

[0027] The first portion 4 and the second portion 5 may be bonded to each other via an interface along the XY plane, for example. The term "bonded via an interface" refers to a state in which two matrix phases having different compositions are in contact with each other via a clear boundary surface. For example, the first portion 4 (matrix phase) and the second portion 5 (matrix phase) are separated into layers as shown in FIG. 4 and FIG. 5, and are bonded via the interface. For example, in a composition in which fine particles are dispersed in a resin, the resin serving as the substrate corresponds to the matrix phase, while the fine particles correspond to the dispersed phase. Bonding between two phases having a common matrix phase and different only in the dispersed phase, or a bonding mode in which the material changes continuously, for example, a material in which fine particles are dispersed in a resin in which only the density of the fine particles changes continuously in a certain direction, is not included in bonding via an interface. The interface may be a plane parallel to the base surface 1 of the cone structure 31 or a non-parallel plane. The interface may have a curved surface to a certain extent due to manufacturing errors or surface tension in the manufacturing method described later. The cone structure 31 may further have a third portion in some cases, or may have a multi-layer structure having more than one portion.

[0028] The first portion 4 is made of a non-adhesive or weakly adhesive material (a non-adhesive or first adhesive material). The non-adhesive or weakly adhesive material is preferably one that has no adhesiveness to the object or has adhesiveness but can be easily peeled off. In one embodiment, the non-adhesive or weakly adhesive material has a storage modulus (G') calculated by dynamic viscoelasticity measurement of 3×10 at room temperature and a frequency of 1 Hz. 5 Pa or higher, 4×10 5 Pa or higher, 5×10 5 Pa or higher, 6×10 5 Pa or higher, 7×10 5 Pa or higher, 8×10 5 Pa or higher, 9×10 5 Pa or more, or 1×10 6 Pa or more. Specific examples include polyurethane, poly(meth)acrylate, cellulose, silicone, amine-based resin, fluorine-based resin, polyvinyl chloride, etc. When tested according to JIS K 7125 except that a metal sliding piece such as a steel material (for example, SS400 material, which may be plated with chrome plating, etc.) is pulled at a speed of 1000 mm / min, the static friction coefficient of the non-adhesive or weakly adhesive material is preferably 10 or less, 7 or less, 5 or less, 4 or less, or 3 or less. It is preferable that the non-adhesive or weakly adhesive material has high solubility and / or dispersibility in any of the commonly used solvents, such as water, water-miscible solvents such as alcohol, or water-immiscible solvents such as hydrocarbons. In addition, it is preferable that the solvent that dissolves and / or disperses the non-adhesive or weakly adhesive material has a relatively low vapor pressure and is easy to dry. Furthermore, it is preferable to consider the wettability with respect to the mold for forming the microstructure 13. If the wettability is too low, the solvent may not be able to enter inside the recesses of the mold, and if it is too high, the solvent may remain between the recesses of the mold.

[0029] The second portion 5 is made of a second adhesive material having higher adhesiveness than the material of the first portion 4. The second adhesive material is preferably one that has adhesiveness to an object but is easily removable. Removable means that once applied, it can be removed with little adhesive residue. In one embodiment, the second adhesive material has a storage modulus (G') calculated by dynamic viscoelasticity measurement of 3×10 at 25° C. and a frequency of 1 Hz. 5 The second adhesive material is a pressure-sensitive adhesive having a pressure of 0.1 Pa or less. Specific examples include acrylic adhesives, rubber adhesives, silicone adhesives, urethane adhesives, polyester adhesives, polyolefin adhesives, and adhesives blended with them. The second adhesive material is preferably one that has high solubility and / or dispersibility in any of the commonly used solvents, such as water, water-miscible solvents such as alcohol, or water-immiscible solvents such as hydrocarbons. In addition, the solvent that dissolves and / or disperses the second adhesive material is preferably one that has a relatively low vapor pressure and is easy to dry. Furthermore, it is preferable to consider the wettability of the mold for forming the microstructure 13. If the wettability is too low, the solvent may not be able to enter the inside of the recesses of the mold, and if the wettability is too high, the solvent may remain between the recesses of the mold.

[0030] It is preferable that the material of the first portion 4 and the material of the second portion 5 each have a certain level of hardness or more so as to maintain the microstructure 13. For example, it is preferable that the material has a tan δ of 0.8 or less, 0.7 or less, 0.6 or less, 0.5 or less, 0.4 or less, or 0.3 or less when measured at room temperature and at a frequency of 1 Hz.

[0031] The term "adhesiveness" refers to the relative strength of adhesiveness to the same object. Adhesiveness can be evaluated by known techniques such as dynamic viscoelasticity measurement or 90° and 180° peel strength tests.

[0032] Although the combination of the material of the first portion 4 and the material of the second portion 5 is not limited, it is more preferable to select the materials in consideration of the adhesive strength between them. For example, from the viewpoint of affinity of the polymer structure, if the material of the first portion 4 is silicone, the material of the second portion 5 is also preferably a silicone-based adhesive. However, it is not necessarily required that the material of the first portion 4 and the material of the second portion 5 are polymers having the same structure.

[0033] The adhesive layer 12 may have a base 32 below the multiple pyramidal structures 31. The base 32 is joined or continuous with the bottom surface 1 of the pyramidal structures 31 of the microstructure 13. The material of the base 32 may be the same as or different from that of the second portion 5. In one embodiment, the pyramidal structures 31 are composed of two portions, the first portion 4 and the second portion 5, and the base 32 is composed of the same material as the second portion 5 and is continuous with the second portion 5. The thickness of the base 32 can be set arbitrarily according to the desired thickness of the adhesive layer 12. If the material of the base 32 is elastic, the pyramidal structures 31 in the microstructure 13 can sink into the base 32, which makes it easier for the second portion 5 of the pyramidal structures 31 to contact the object, and the adhesiveness of the adhesive sheet 10 may be improved.

[0034] When the material of the first portion 4, the material of the second portion 5, and the materials constituting other portions, if any, are all transparent, the entire adhesive layer 12 can be made transparent. In this case, in order to make the interface where each portion is joined invisible, it is preferable that the difference in refractive index between the materials constituting each portion is within 1%. Specifically, when the first portion 4 and the second portion 5 of the cone structure 31 are adjacent to each other and the difference in refractive index between the material constituting the first portion 4 and the material constituting the second portion 5 is within 1%, within 0.9%, within 0.8%, within 0.7%, or within 0.6%, the interface between the two portions is generally invisible. For example, when the first portion 4 is made of an acrylic transparent resin and the second portion 5 is made of an acrylic transparent adhesive, it is possible to provide a completely transparent adhesive layer 12 that satisfies such requirements. Note that transparency can be defined, for example, by a haze of 40% or less measured according to JIS K 7136.

[0035] From the viewpoint of facilitating the formation of the first portion 4, the pyramidal structures 31 included in the microstructure 13 may have a maximum distance between the centers of two adjacent pyramidal structures 31 of 300 μm or less, 260 μm or less, 220 μm or less, 180 μm or less, 140 μm or less, or 100 μm or less. Note that the center of the pyramidal structure 31 means the apex of the pyramid. The center of the frustum structure 131 (FIG. 8) means the apex of the corresponding pyramidal structure.

[0036] From the standpoint of facilitating the formation of the first portion 4, the width (corresponding to α described below) of the base surface 1 of the pyramidal structure 31 in the arrangement direction of the pyramidal structure 31 (e.g., the X-axis direction) may be 500 μm or less, 450 μm or less, 400 μm or less, 350 μm or less, 300 μm or less, 250 μm or less, 200 μm or less, 150 μm or less, 100 μm or less, 95 μm or less, 90 μm or less, 85 μm or less, 80 μm or less, 75 μm or less, 70 μm or less, 65 μm or less, 60 μm or less, 55 μm or less, or 50 μm or less.

[0037] From the standpoint of facilitating the manufacture of the adhesive sheet 10 or making it easier to peel off the liner 71 (see Figure 14) from the finished adhesive sheet 10, the height H of the cone structure 31 may be 5 μm or more and 100 μm or less, 95 μm or less, 90 μm or less, 85 μm or less, 80 μm or less, 75 μm or less, 70 μm or less, 65 μm or less, 60 μm or less, 55 μm or less, or 50 μm or less.

[0038] The bases 1 of two adjacent pyramidal structures 31 may be close to each other. For example, in the case of a square pyramid or a hexagonal pyramid, the bases 1 of two adjacent pyramidal structures 31 may share one side, or the adjacent sides may be spaced apart by an interval (corresponding to β described later) of, for example, 250 μm or less, 200 μm or less, 150 μm or less, 100 μm or less, 50 μm or less, 15 μm or less, or 10 μm or less.

[0039] The pitch α of adjacent pyramidal structures 31 (the pitch in the case of FIG. 8 is α+β) may be 10 μm or more, 15 μm or more, 20 μm or more, and 200 μm or less, 150 μm or less, or 100 μm or less.

[0040] The height H of the pyramidal structure 31 may be 5 μm or more, 10 μm or more, and 25 μm or less. When the height H of the pyramidal structure 31 is 100%, the height H1 of the first portion 4 may be 10% or more, 15% or more, or 20% or more of the height H of the pyramidal structure 31 from the viewpoint of slidability and the like. Also, from the viewpoint of adhesive strength after compression bonding, it may be 90% or less, 80% or less, 70% or less, 60% or less, or 50% or less. The height H2 of the second portion 5 corresponds to the difference between the height H of the pyramidal structure 31 and the height H1 of the first portion 4. The heights H, H1, and H2 are based on the normal direction (Z-axis direction) of the bottom surface 1 of the pyramidal structure 31. When the interface between the first portion 4 and the second portion 5 therebelow is a flat surface or a curved surface not parallel to the bottom surface 1, the height H1 is calculated from the average value of the heights of the interfaces obtained based on the normal direction of the bottom surface 1. When the first portion 4 is relatively small, the slidability of the adhesive sheet 10 decreases and the frictional force increases, but the adhesive force exerted when a certain level of pressure or more is applied tends to improve. On the other hand, when the first portion 4 is relatively large, the opposite is true.

[0041] The thickness of the adhesive layer 12 can be set arbitrarily depending on the adhesive material used and the purpose of use of the adhesive sheet 10, and can be, for example, in the range of 15 μm to 10 mm or 200 μm to 4 mm. The thickness of the adhesive layer 12 is based on the normal direction of the base surface 1 of the cone structure 31 and means the distance between the highest part of the cone structure 31 and the back surface 12b opposite to the front surface 12a having the microstructure 13.

[0042] The angle θ between the side surface 3 and the bottom surface 1 of the cone structure 31 may be 5° or more, 10° or more, 15° or more, 20° or more, or 25° or more in a cross section (XZ plane) including the apex of the cone structure 31 and the arrangement direction of the cone structures 31, from the viewpoint of ease of formation of the first portion 4 or slidability of the adhesive layer 12. In addition, from the viewpoint of smooth peeling of the adhesive sheet 10 from the liner 71 described later, the angle θ may be less than 90°, 85° or less, 80° or less, or 70° or less in a cross section (XZ plane) including the apex of the cone structure 31 and the arrangement direction of the cone structures 31.

[0043] The number of pyramidal structures 31 is set to 1 mm 2 on the surface of the adhesive layer 12 in order to provide sufficient sliding properties. 2 It is preferable that there are 16 or more, 25 or more, 36 or more, 49 or more, 64 or more, 81 or more, or 100 or more per unit area. The number of pyramidal structures 31 corresponds to the number of centers of pyramidal structures 31 present within a unit area. A high density of pyramidal structures 31 also contributes to improved slidability.

[0044] The adhesive layer 12 may contain additional materials other than the adhesive, such as particulates, such as hollow or solid glass spheres, for the purpose of adjusting the adhesive properties. However, the adhesive sheet 10 of the present disclosure can achieve the desired properties without such additional materials. In one embodiment, the adhesive layer 12 does not contain particulates.

[0045] (Characteristics of adhesive sheet) The adhesive sheet 10 is applied under low pressure, for example, a pressure of 100 g / cm2 Below, 50g / cm 2 Below, 10g / cm 2 , or 5g / cm 2 In a preferred embodiment, the adhesive sheet 10 has sufficient slidability in the following cases: In a preferred embodiment, the adhesive sheet 10 has a dynamic friction coefficient (μ D ) is equal to or less than 10, equal to or less than 5, equal to or less than 3. With such a low frictional force, the adhesive sheet 10 can be easily slid in light contact with the target for alignment.

[0046] The adhesive sheet 10 exerts sufficient adhesive strength to the target when a relatively high pressure is applied to the back surface 12b of the adhesive layer 12. In one embodiment, the relatively high pressure can be defined as a pressure equivalent to the pressure applied by moving a 2 kg roller back and forth at a speed of 300 mm / min using a pressing device specified in 10.2.4 of JIS Z 0237:2009. In another embodiment, the relatively high pressure can be defined as a pressure equivalent to the pressure applied by moving a 2 kg roller back and forth at a speed of 300 mm / min. 2 More than 300g / cm 2 More than 400g / cm 2 More than 500g / cm 2 More than 600g / cm 2 or more than 700g / cm 2 This can be defined as a pressure of 30 N / 20 mm or less. In a preferred embodiment, the adhesive sheet 10 has a peel strength of 30 N / 20 mm or less when tested according to JIS Z 0237:2009 at a temperature of 23° C. and a tensile speed of 300 mm / min. Such an adhesive strength makes it easy to remove the adhesive sheet 10.

[0047] Since the adhesive sheet 10 has the microstructure 13 on the surface 12a of the adhesive layer 12, air bubbles are unlikely to be trapped in the adhesive surface when the adhesive sheet 10 is attached to an object, and even if air bubbles are trapped, they can be easily released. In this specification, such a property is referred to as "air release property." In one embodiment, the surface 12a of the adhesive layer 12 may further have an additional groove-shaped structure for improving air release property, in addition to the above-mentioned microstructure 13.

[0048] The static friction coefficient of adhesive sheet 10 when tested according to JIS K 7125 except that the steel material is pulled at a speed of 1000 mm / min may be 10 or less, or may be 5 or less. In this case, adhesive sheet 10 has high slidability against an object against which it is pressed with low pressure.

[0049] Fig. 6 is a cross-sectional view of an adhesive sheet according to another embodiment. The adhesive sheet 110 shown in Fig. 6 has the same configuration as the adhesive sheet 10 shown in Fig. 4 and Fig. 5, except that it further includes a cushion layer 102. The cushion layer 102 is provided on the back surface 12b on which the microstructure is not provided.

[0050] The cushion layer 102 is softer than the adhesive layer 12. The compression load of the cushion layer 102 is smaller than the compression load of the adhesive layer 12. The compression load of the cushion layer 102 may be, for example, 1 MPa or less, 0.5 MPa or less, or 0.1 MPa or less. The compression load is the load when the thickness D is compressed by 25% (7.5 mm) when a plurality of cushion layers 102 cut to a size of 25 mm×25 mm are stacked together to a thickness D (10 mm) and sandwiched between a pair of plates and compressed at a speed of 10 mm per minute by a tensile tester. A smaller compression load results in higher cushioning properties.

[0051] The thickness of the cushion layer 102 may be 0.1 mm or more, or 0.5 mm or more. When the cushion layer 102 is made thicker, the cushioning properties are increased.

[0052] The cushion layer 102 may be an adhesive layer (second adhesive layer) made of a third adhesive material different from the material (second adhesive material) of the second portion 5 of the adhesive layer 12 (first adhesive layer). Examples of the third adhesive material are the same as the examples of the second adhesive material. The cushion layer 102 may be in contact with the adhesive layer 12. In this case, the adhesive layer 12 and the cushion layer 102 function as an integrated adhesive layer, improving the adhesiveness. The cushion layer 102 may be an adhesive layer containing, for example, thermoplastic polyurethane, acrylic foam, or the like. The cushion layer 102 may constitute a cushion layer together with the second portion 5 and the base 32 of the adhesive layer 12. That is, in the adhesive sheet 10, the second portion 5 and the base 32 of the adhesive layer 12 may constitute the cushion layer 102.

[0053] A carrier such as a resin film or an additional layer (e.g., an adhesive layer) may be disposed between the cushion layer 102 and the adhesive layer 12. Examples of the resin film include films made of ABS, ASA, acrylic, polycarbonate, polyurethane, fluorine-based resin, polyethylene, polypropylene, polyester, or PVC. In this case, the adhesive sheet 110 may have an optional layer including a primer between the cushion layer 102 and the adhesive layer 12.

[0054] The use of the cushion layer 102 allows the pyramidal structure 31 in the microstructure 13 to sink into the cushion layer 102, making it easier for the second portion 5 of the pyramidal structure 31 to come into contact with the object, which may improve the adhesion of the adhesive sheet 110.

[0055] FIG. 7 is a cross-sectional view of an adhesive sheet according to another embodiment. The adhesive sheet 210 shown in FIG. 7 has the same configuration as the adhesive sheet 110 of FIG. 6, except that it has a cushion layer 104 instead of the cushion layer 102. The cushion layer 104 has a non-adhesive layer 104a and adhesive layers 104b and 104c provided on both sides of the non-adhesive layer 104a. The adhesive layer 104b is disposed between the adhesive layer 12 and the non-adhesive layer 104a. The cushion layer 104 does not need to have the adhesive layer 104b. Examples of materials for the adhesive layers 104b and 104c are the same as the examples of materials for the cushion layer 102. Examples of the non-adhesive layer 104a are the above-mentioned resin film, polyurethane foam, acrylic foam, etc.

[0056] 8 is a cross-sectional view of a portion of an adhesive sheet according to another embodiment. The adhesive sheet 310 shown in FIG. 8 has a plurality of frustum structures 131 instead of the plurality of pyramidal structures 31, and has the same configuration as the adhesive sheet 10, except that the plurality of frustum structures 131 are arranged at intervals in the arrangement direction. Each frustum structure 131 has a structure in which the top part including the apex of the pyramidal structure 31 is partially removed. Examples of the shape of the frustum structure 131 include a circular frustum, a triangular frustum, a square frustum, and a hexagonal frustum. Each frustum structure 131 has a first portion 4 present at the apex 2 of the frustum structure 131 and a second portion 5 present below the first portion 4 (on the bottom surface 1 side).

[0057] In this embodiment, in the arrangement direction of the frustum structures 131 (for example, the X-axis direction), the width of the base surface 1 of the frustum structure 131 is α, and the interval between the base surfaces 1 of adjacent frustum structures 131 is β. In the example of FIG. 8, β is greater than 0, but β may be 0.

[0058] In the arrangement direction of the frustum structures 131, the width of the top surface of the frustum structure 131 is a, and the distance between the top surfaces of adjacent frustum structures 131 is b. When a is 0, the frustum structure 131 has the same structure as the pyramidal structure 31.

[0059] The width a of the top surface of the frustum structure 131 in the arrangement direction of the frustum structure 131 is, for example, 50 μm or less, 40 μm or less, 30 μm or less, 20 μm or less, or 10 μm or less. By ensuring that the width a of the top surface is not excessively large relative to the width α of the bottom surface 1, it is possible to prevent a decrease in the adhesive force exhibited when a pressure of a certain level or more is applied.

[0060] Fig. 9 is a cross-sectional view showing another example of a cone structure. The cross section of the cone structure 31 may have a triangular shape as shown in Fig. 9(a), may have a distorted side surface as shown in Fig. 9(b) to (d), or may have a shape in which the apex is off-center from the base as shown in Fig. 9(e). As shown in Fig. 9(f), the cross section of the cone structure 31 may have a distorted side surface and a shape in which the apex is off-center from the base. Note that the cross sections passing through the apex of the cone structure 31 do not necessarily all have the same shape, and each cross section may have a different shape.

[0061] FIG. 10 is a cross-sectional view showing another example of the frustum structure. The cross section of the frustum structure 131 may have a trapezoid as shown in FIG. 10(a), may have a distorted side surface as shown in FIG. 10(b)-(c), or may have a distorted top surface as shown in FIG. 10(d)-(e). As shown in FIG. 10(f), the cross section of the frustum structure 131 may have a distorted side surface and a distorted top surface. Note that the cross sections passing through the apex of the pyramid corresponding to the frustum structure 131 do not necessarily all have the same shape, and may have different shapes for each cross section. In addition, the top surface of the frustum structure 131 does not have to be parallel to the bottom surface or be a plane.

[0062] FIG. 11 is a perspective view of an adhesive sheet according to another embodiment. The adhesive sheet 410 shown in FIG. 11 has the same configuration as the adhesive sheet 10 of FIG. 1, except that it has a plurality of rib structures 231 instead of a plurality of cone structures 31. The adhesive sheet 410 has an adhesive layer 212 having a microstructure 113 including a plurality of rib structures 231. The plurality of rib structures 231 are arranged along the X-axis direction, and each rib structure 231 extends in the Y-axis direction. Each rib structure 231 has a first portion 14 present at the top of the rib structure 231 and a second portion 15 present below (on the bottom side) the first portion 14. A cross section of the adhesive sheet 410 perpendicular to the Y-axis direction is the same as the cross section of the adhesive sheet 10 shown in FIG. 5.

[0063] The rib structure 231 is a three-dimensional figure having a bottom surface in a plane figure whose length in an arbitrary axial direction (Y-axis direction) on a plane is longer than the length in an axial direction (X-axis direction) perpendicular to the axis, and is configured by connecting all points on the sides of the bottom surface to all points on the sides of a line or rectangle that is not on the plane and extends in a direction substantially parallel to the Y-axis direction. The cross section of the rib structure 231 can have any shape as exemplified in Figs. 9(a) to (f) and 10(a) to (f), similarly to the pyramidal structure 31 and the frustum structure 131. The ratio of the length of the bottom surface of the rib structure 231 in the Y-axis direction to the length of the bottom surface in the X-axis direction, i.e., the aspect ratio, is, for example, 2 or more, 3 or more, 4 or more, 5 or more, 10 or more, 50 or more, 100 or more, 500 or more, 1000 or more, or 10000 or more. The rib structure 231 may be continuous along any axial direction over the entire surface of the adhesive sheet 410.

[0064] Figure 12 is a cross-sectional view showing a step in a method for producing the adhesive sheet of Figure 6. Figure 13 is a cross-sectional view showing a step following the step of Figure 12. Figure 14 is a cross-sectional view showing a step following the step of Figure 13. The adhesive sheet 110 of Figure 6 can be produced, for example, through the following steps.

[0065] (Mold preparation process) First, as shown in FIG. 12(a), a mold 61 is prepared. The mold 61 has a microstructure 61b on a surface 61a. The microstructure 61b includes a plurality of pyramidal structures 61c. The mold 61 can be produced by processing a flat plate made of a material such as metal or resin using a diamond bit or a laser. The pyramidal structures 61c have substantially the same shape as the pyramidal structures 31 of the adhesive sheet 110. The difference between the size of the pyramidal structures 61c and the size of the pyramidal structures 31 is preferably within ±5%, ±3%, or ±1%. However, the height H of the pyramidal structures 31 may have a larger difference due to the shrinkage of the second portion 5 or the effect of gravity. The size of the pyramidal structures 31 means the size immediately after the liner 71 is peeled off, for example, within 5 minutes or within 3 minutes.

[0066] (Liner manufacturing process) Next, as shown in Figs. 12(a) to (c), the mold 61 is pressed against the liner 71 to transfer the microstructure 61b on the surface 61a of the mold 61 to the liner 71. The material of the liner 71 can be one that can form the microstructure 61b by transfer and can hold it. One example of the liner 71 includes a sheet 71a in which a resin is laminated on the surface of a sheet body made of resin or paper, and a release coating 71b provided on the surface of the sheet 71a. The release coating 71b is made of, for example, silicone. The transfer of the microstructure 61b can be performed, for example, by placing the mold 61 against the surface (release coating 71b) of the liner 71 and heat pressing the surface of the liner 71. By the transfer, a microstructure 72 complementary to the microstructure 61b of the mold 61 is formed on the surface of the liner 71. The microstructure 72 includes a plurality of recesses 72a having a pyramidal structure.

[0067] (First part forming process) Next, as shown in Figures 13(a) to (d), a solution containing a non-adhesive or weakly adhesive material is applied to the microstructure 72 of the liner 71 and then solidified to form the first portion 4.

[0068] First, as shown in FIG. 13(a), a solution 81 containing a non-adhesive or weakly adhesive material is applied to the microstructure 72 formed on the surface of a liner 71 by coating, spraying, or the like.

[0069] Next, as shown in Fig. 13(b), the excess solution 81 is scraped off by a remover 82 such as a doctor blade or a squeegee. The remover 82 moves in a direction A along the surface of the liner 71. As a result, as shown in Fig. 13(c), the solution 81 is stored in each of the recesses 72a formed on the surface of the liner 71. It is preferable that the recesses 72a in the microstructure 72 formed on the surface of the liner 71 are closely spaced from each other, because this makes it easier to scrape off the solution 81.

[0070] Next, as shown in FIG. 13(d), the solution 81 in the recess 72a is dried to remove the solvent, thereby forming the first portion 4 in the recess 72a. The first portion 4 is disposed at the bottom of each recess 72a and is made of a solid non-adhesive or weakly adhesive material. After drying, the first portion 4 may be irradiated with ultraviolet light or an electron beam, etc., as necessary, to harden the non-adhesive or weakly adhesive material. In one embodiment, as shown in FIG. 13(d), the first portion 4 occupies the bottom to middle of the recess 72a and has a surface on the upper side that is approximately parallel to the horizontal plane determined by the placement of the liner 71 during drying. In addition, when the angle θ between the side surface and the bottom surface of the pyramidal structure 61c in the mold 61 used to prepare the liner 71 is large, or when the distance between the bottom surfaces of the pyramidal structures 61c is small, it becomes easy to drop the solution 81 containing the non-adhesive or weakly adhesive material into the bottom of the recess 72a. As a result, the formation of the first portion 4 is also easy. The solution 81 is, for example, polyurethane, poly(meth)acrylate, or a resin such as cellulose, silicone, amine-based resin, fluorine-based resin, or polyvinyl chloride dissolved and / or dispersed in an appropriate solvent. The solvent used in the solution 81 may affect the above-mentioned scraping off of the solution 81. For example, when a solvent such as ethyl acetate, methyl ethyl ketone, or methyl isobutyl ketone is used, it is preferable that the distance between the bases of the pyramidal structures 61c in the mold 61 is closer (for example, 50 μm or less).

[0071] (Step of forming second portion) Next, as shown in FIG. 14(a), the second adhesive material or its precursor is applied to the liner 71 on which the first portion 4 is formed, to form the second portion 5. In this embodiment, an adhesive layer 12 including the second portion 5 and the base 32 is formed on the liner 71. If any other portion exists between the first portion 4 and the second portion 5, the second portion 5 is formed after the first portion 4 is formed and after the formation of the any other portion. The application of the second adhesive material can be performed by various methods. For example, the second adhesive material already molded into a sheet shape or the like is attached to the microstructure 72 of the liner 71, and heat and / or pressure is applied or the material is left to stand for a certain period of time or more under normal temperature and normal pressure, so that the second adhesive material flows and penetrates into the recesses 72a on the surface of the liner 71, and is bonded to the first portion 4 at the bottom of the recesses 72a. In another example, a precursor that is cured by irradiation with energy rays such as ultraviolet rays or electron beams to become the second adhesive material is applied to the microstructure 72 of the liner 71, penetrates into the recesses 72a, and is then irradiated with energy rays. In another example, a solution of the second adhesive material is applied to the microstructures 72 of the liner 71 so as to penetrate into the recesses 72a, and then optionally heated and dried to remove the solvent.

[0072] (Cushion layer forming process) 14(b) to (c), a cushion layer 102 is formed on the adhesive layer 12. The cushion layer 102 is laminated on the adhesive layer 12 using, for example, a roller 103. The cushion layer 102 is made of, for example, an acrylic foam tape, and the cushion layer 102 is adhered to the adhesive layer 12. Thereafter, the liner 71 is peeled off from the adhesive layer 12.

[0073] By going through the above steps, the adhesive sheet 110 in FIG. 6 can be manufactured. After forming the second portion 5 as shown in FIG. 14(a), the liner 71 may be peeled off from the adhesive layer 12 without forming the cushion layer 102. In this case, the adhesive sheet 10 in FIG. 4 and FIG. 5 can be manufactured. Also, in the cushion layer forming step, the adhesive sheet 210 in FIG. 7 can be manufactured by forming the cushion layer 104 on the adhesive layer 12. Furthermore, by changing the shape of the microstructure 61b of the mold 61, the adhesive sheet 310 in FIG. 8 or the adhesive sheet 410 in FIG. 11 can be manufactured in the same manner as above.

[0074] Fig. 15 is a cross-sectional view showing a process of attaching a dispenser 140 including the adhesive sheet 110 of Fig. 6 to an object 111. The dispenser 140 has the same configuration as the dispenser 40 of Fig. 1 except that the dispenser 140 includes the adhesive sheet 110 instead of the adhesive sheet 10.

[0075] First, as shown in FIG. 15(a), the dispenser 140 is placed on the object 111 so that the surface 12a of the adhesive layer 12 faces the object 111. The object 111 is, for example, a desk or a wall. The surface of the object 111 may extend horizontally or vertically. The surface of the object 111 may be an inorganic material such as metal or ceramic, or an organic material such as resin. In a state where the dispenser 140 is not pressed against the object 111 at all or almost not pressed against the object 111, the first part 4 supports the dispenser 140, and the second part 5 does not contact the object 111 at all or only slightly. In this case, the dispenser 140 has a slidable property. That is, the dispenser 140 is slidable relative to the object 111, and therefore the position can be easily changed.

[0076] 15(b), when the dispenser 140 is pressed against the object 111 with a pressure B, the second portion 5 itself is deformed, the first portion 4 is deformed, or the first portion 4 is taken into the second portion 5, and the second portion 5 comes into contact with the object 111. This causes the adhesive layer 12 to exert an adhesive force on the object 111. Furthermore, the adhesive layer 12 can be peeled off from the object 111 again.

[0077] As described above, when the adhesive sheet 110 is disposed between the case body 42 and the target 111, the dispenser 140 can be pressed against the target 111 with pressure B to adhere the dispenser 140 to the target 111. The dispenser 140 can then be removed again from the target 111 by lifting it up. In this manner, the use of the adhesive sheet 110 allows the dispenser 140 to be repeatedly adhered and removed again. The dispenser 140 is prevented from moving when the tape-like article 44 (see FIG. 1) is pulled or cut. Therefore, a weight and a space for arranging the weight, which were conventionally required to suppress the movement of the dispenser 140 (or the dispenser 50 in FIG. 16 or the case 60 in FIG. 17) or to stabilize the operation of taking out the portion 44a (or the sticky notes 54a to 54f in FIG. 16 or the article 64 in FIG. 17) of the tape-like article 44 from the dispenser 140 (or the dispenser 50 in FIG. 16 or the case 60 in FIG. 17), are no longer necessary. As a result, the dispenser 140 can be made smaller and lighter. Similarly, even if the adhesive sheet 10, 210, 310, 410 is used instead of the adhesive sheet 110, it can be repeatedly attached to the object 111 and peeled off again. Even if the adhesive sheet 10, 110, 210, 310, 410 is attached to the object 111 alone, it can be repeatedly attached to the object 111 and peeled off again.

[0078] Since the adhesive sheet 110 includes the cushion layer 102, the cushion layer 102 can be deformed when the dispenser 140 is adhered to the object 111. Therefore, even if the bottom surface 42s, the side surface 42t, or the surface of the object 111 of the case body 42 has unevenness or distortion, the contact area between the surface 12a of the adhesive layer 12 and the object 111 can be increased. For example, when the case body 42 is a plastic molded product, the bottom surface 42s and the side surface 42t of the case body 42 may be distorted. At that time, a gap is created between the distorted bottom surface 42s or the side surface 42t and the object 111. In that case, the adhesive area is small with a thin double-sided tape, so that it is difficult to obtain the adhesive strength that is originally required. On the other hand, when a cushion layer is present, the cushion layer 102 is deformed, so that the contact area between the surface 12a of the adhesive layer 12 and the object 111 can be increased. Furthermore, even when adhesive sheet 110 is attached to object 111 alone, the contact area between surface 12a of adhesive layer 12 and object 111 can be increased by deformation of cushion layer 102. Similarly, for adhesive sheet 210, the contact area between surface 12a of adhesive layer 12 and object 111 can be increased by deformation of cushion layer 104. When there is a sufficient adhesive area, sufficient adhesive strength is exhibited, and dispenser 140 (or dispenser 50 in FIG. 16 or case 60 in FIG. 17) is appropriately held on object 111, and the action of pulling out portion 44a of tape-like article 44 (or sticky notes 54a-54f in FIG. 16 or object 64 in FIG. 17) is not inhibited.

[0079] 3(a) to (d), when the width of the adhesive sheet 10 at one end 10e in the X-axis direction is smaller than the width of the adhesive sheet 10 at the center 10m in the X-axis direction, the adhesive sheet 10 can be peeled off from the target 111 starting from one end of the adhesive sheet 10. When peeling the dispenser 40 in FIG. 1 from the target 111, the user can easily peel it off by pushing up a portion of the case body 42 that is close to one end 10e of the adhesive sheet 10.

[0080] FIG. 16 is a cross-sectional view showing a dispenser according to another embodiment. The dispenser 50 shown in FIG. 16 includes a case body 52 for storing a laminate 54 (sheet-like article) and an adhesive sheet 10 provided on a bottom surface 52s (outer surface) of the case body 52. ​​The laminate 54 is an example of a sheet-like article that can be separated into a plurality of parts. The laminate 54 includes a plurality of stacked sticky notes 54a-54f (a plurality of parts). The sticky notes 54a-54f are separable from each other. Each of the sticky notes 54a-54f includes a base sheet and an adhesive layer provided on a portion of the surface of the base sheet. The dispenser 50 can supply the sticky notes 54a-54f separated from the laminate 54 to a user.

[0081] The back surface 12b of the adhesive layer 12 of the adhesive sheet 10 faces the bottom surface 52s of the case body 52. ​​The adhesive sheet 10 may be provided on the side surface 52t of the case body 52. ​​The adhesive sheet 10 may be adhered to any surface of the outer surface of the case body 52 other than the bottom surface 52s and the side surface 52t.

[0082] The case body 52 is, for example, a plastic molded product. The case body 52 includes a bottom wall portion 52a, a side wall portion 52b, and a lid portion 52c. The bottom wall portion 52a is configured in a rectangular plate shape and configures the bottom plate of the case body 52. ​​The lower surface of the bottom wall portion 52a is the bottom surface 52s of the case body 52. ​​The bottom wall portion 52a has a pair of edges facing each other in the X-axis direction and a pair of edges facing each other in the Y-axis direction. The side wall portion 52b is provided so as to extend upward from the four edges of the bottom wall portion 52a. The outer surface of the side wall portion 52b is the side surface 52t of the case body 52. ​​The lid portion 52c is provided at the upper end portion of the side wall portion 52b and faces the bottom wall portion 52a in the Z-axis direction. In this embodiment, the plate-like member configuring the lid portion 52c is configured in a rectangular shape when viewed from the Z-axis direction. Lid portion 52c may be formed of a plate-like member that is curved in an arch shape so as to be convex in the Z-axis direction from bottom wall portion 52a toward lid portion 52c when viewed from the Y-axis direction. Lid portion 52c is also formed with slits 52h that form an opening for pulling out sticky notes 54a-54f. Slits 52h penetrate lid portion 52c in the thickness direction. Slits 52h are formed at the center of lid portion 52c in the X-axis direction so as to extend in the Y-axis direction.

[0083] The sticky notes 54a to 54f are supplied one by one from the dispenser 50 as follows. For the sake of explanation, the sticky notes are referred to as 54a, 54b, 54c, 54d, 54e, and 54f in order from the top in the stacking direction. As shown in FIG. 16, when the sticky note 54a is taken out of the dispenser 50, a part of the end 54t side of the sticky note 54a is already exposed to the outside of the case body 52 through the slit 52h. The user holds the part of the sticky note 54a on the end 1d side, i.e., the part of the sticky note 54a on which no adhesive layer is formed, with his / her fingers and pulls it up. At this time, the sticky note 54a is pulled out to the outside of the case body 52 through the slit 52h, and the sticky note 54b on the lower side, which is joined at the end 54s side, is pulled up. At this time, the joining between the sticky note 54b and the sticky note 54a needs to be maintained. When the end 43s of the sticky note 54a is pulled out of the slit 52h, a part of the sticky note 54b on the end 54s side is also pulled out of the slit 52h. Then, the part of the sticky note 54a on the end 54s side is peeled off from the part of the sticky note 54b on the end 54s side. After the part of the sticky note 54b on the end 54s side is pulled out, the adhesive strength needs to be adjusted to a level where the sticky note 54a is peeled off from the sticky note 54b. In this state, the part of the sticky note 54b on the end 54t side is stored in the case body 52 together with the sticky note 54c one note below. This causes the sticky note 54a to be pulled out of the case body 52, and preparations are made for the next time the sticky note 54b is pulled out. Similarly, when the sticky note 54b is pulled out from the end 54s side, a part of the sticky note 54c on the end 54t side is pulled out of the slit 52h to the outside. When sticky note 54c is pulled out from end 54t, a portion of sticky note 54d on end 54s side is pulled out through slit 52h. Similarly, sticky notes 54e and 54f are pulled out from case body 52. ​​At this time, if the adhesive strength (peeling strength) of adhesive sheet 10 is stronger than the force pulling out sticky note 54a, movement of dispenser 50 is suppressed, and sticky note 54a can be smoothly removed.

[0084] As with the dispenser 140 of FIG. 15, the dispenser 50 is also capable of repeatedly adhering and peeling off the adhesive sheet 10 to the object 111.

[0085] Fig. 17 is a cross-sectional view showing a case according to one embodiment. The case 60 shown in Fig. 17 includes a case body 62 for storing at least one article 64 (in this example, a plurality of articles 64), and an adhesive sheet 10 provided on a bottom surface 62s (outer surface) of the case body 62. A back surface 12b of an adhesive layer 12 of the adhesive sheet 10 faces the bottom surface 62s of the case body 62. The adhesive sheet 10 may be provided on a side surface 62t of the case body 62.

[0086] The case body 62 is, for example, a plastic molded product. The case body 62 includes a bottom wall portion 62a and a side wall portion 62b. The bottom wall portion 62a is configured in a rectangular plate shape and configures the bottom plate of the case body 62. The lower surface of the bottom wall portion 62a is the bottom surface 62s of the case body 62. The bottom wall portion 62a has a pair of edges facing each other in the X-axis direction and a pair of edges facing each other in the Y-axis direction. The side wall portion 62b is provided so as to extend upward from the four edges of the bottom wall portion 62a. The outer surfaces of the side wall portion 62b are the side surfaces 62t of the case body 62. The upper ends of the side wall portions 62b form the edges of the opening.

[0087] The article 64 may be a general consumer good (daily necessities) including, for example, stationery, detergent, etc. Examples of stationery include tape, adhesive tape, sticky notes with adhesive, writing implements, erasers, correction tools, glue, scissors, utility knives, staplers, clips, hole punches, push pins, etc. When the article 64 is a general consumer good such as detergent, the article 64 may be in a liquid or powder form. In that case, the case 60 has a lid portion that closes the opening formed by the upper end of the side wall portion 62b, and a mechanism for removing the article 64, such as a pump, etc.

[0088] As with the dispenser 140 of FIG. 15, the case 60 also allows the adhesive sheet 10 to be repeatedly attached to and removed from the object 111.

[0089] Although the preferred embodiments of the present disclosure have been described in detail above, the present disclosure is not limited to the above embodiments.

[0090] For example, the above-mentioned adhesive sheets 10, 110, 210, 310, 410 may be attached to other articles (e.g., entrance mats or gloves, etc.) for temporary fixation or anti-slip purposes. In this case, the back surface 12b of the adhesive layer 12 is attached to the article. This allows the article to be repeatedly attached to the target 111 and peeled off again. EXAMPLES

[0091] The present disclosure will be described in more detail below using examples, but the present disclosure is not limited to these examples.

[0092] Example 1 A mold with multiple equally spaced square pyramid structures was fabricated by machining a metal plate with a diamond bit. The angle between the base and side of the pyramid (corresponding to θ in Figure 5) was 29°, the distance between the apexes of adjacent pyramids (corresponding to α in Figure 5 or b in Figure 8) was 90 μm, and the height of the pyramid (corresponding to H in Figure 5) was 26 μm. The size of the pyramid was measured by observing the surface of the mold with a high-precision microscope and selecting one of the square pyramid structures that produced the clearest image.

[0093] Next, a base liner was prepared, which had a polyethylene terephthalate (PET) sheet with a layer of polyethylene (PE) on both sides, and a release surface was provided by applying a silicone coating to one of the PE layers. A mold was placed on the release surface of the base liner, and the microstructure of the mold was transferred to the base liner by heat pressing, to produce a liner with a microstructure (hereinafter also referred to as a microstructure liner). The heat pressing was performed at a temperature of 120°C and a pressure of 6 MPa for 3 minutes. The microstructure of the microstructure liner had substantially the same size as the microstructure of the mold.

[0094] Next, a polyurethane solution having the composition shown in Table 1 below was prepared. [Table 1]

[0095] Next, the solid content of the polyurethane solution was adjusted to 30% by mass using a solvent obtained by mixing isopropyl alcohol and distilled water in a mass ratio of 1:1. The adjusted polyurethane solution was applied onto the microstructure of the microstructure liner, and the excess solution was scraped off with a doctor blade. Then, the solution was heated in an oven at 80°C for 4 minutes and at 100°C for 4 minutes to volatilize the solvent contained in the solution, so that the solid urethane resin (corresponding to the first portion) was arranged at the bottom of the quadrangular pyramid structure of the microstructure liner.

[0096] Next, an acrylic adhesive solution was applied onto the microstructure of the microstructure liner. The acrylic adhesive solution consisted of 66.1% by weight of an acrylic resin adhesive, 0.8% by weight of a crosslinking agent, and 33.1% by weight of methyl ethyl ketone. It was then heated in an oven at 65°C for 3 minutes and at 85°C for 3 minutes to volatilize the solvent contained in the solution, forming a solid acrylic adhesive layer (thickness 35 μm). The solid acrylic adhesive layer consisted of a portion (corresponding to the second portion) located within the quadrangular pyramid structure of the microstructure liner and a base portion supporting the second portion.

[0097] Next, a carrier (stretched polypropylene film) having a 150 μm thick thermoplastic polyurethane layer formed on its surface was laminated to the acrylic adhesive layer so that the thermoplastic polyurethane layer faced the acrylic adhesive layer. The lamination was performed at room temperature with a nip pressure of 2 kg / cm. 2 The study was carried out under the following conditions.

[0098] Next, the carrier (stretched polypropylene film) was peeled off. The thermoplastic polyurethane layer remained on the acrylic adhesive layer. Then, a double-sided tape (product name: PSD-20, manufactured by 3M) made of acrylic foam tape with a thickness of 0.8 mm was laminated on the surface of the thermoplastic polyurethane layer. The lamination was performed at room temperature. The thermoplastic polyurethane layer and the acrylic foam tape correspond to the cushion layer.

[0099] In this manner, the adhesive sheet of Example 1 was produced. When the adhesive sheet was to be used, the liner and the microstructure liner of the double-sided tape were peeled off.

[0100] Example 2 The adhesive sheet of Example 2 was prepared in the same manner as in Example 1, except that an acrylic adhesive consisting of 69.9% by weight acrylic adhesive, 2.1% by weight isocyanate crosslinker, 14.0% by weight methyl ethyl ketone, and 14.0% by weight heptane was used when forming the second portion and the base.

[0101] Example 3 An adhesive sheet of Example 3 was produced in the same manner as in Example 1, except that when forming the first portion, the solids content of the polyurethane solution was adjusted to 20 mass %.

[0102] Example 4 An adhesive sheet of Example 4 was produced in the same manner as in Example 2, except that the solids content of the polyurethane solution was adjusted to 20 mass % when the first portion was formed.

[0103] Example 5 An adhesive sheet of Example 5 was produced in the same manner as in Example 1, except that when forming the first portion, the solids content of the polyurethane solution was adjusted to 10 mass %.

[0104] Example 6 An adhesive sheet of Example 6 was produced in the same manner as in Example 2, except that the solids content of the polyurethane solution was adjusted to 10 mass % when the first portion was formed.

[0105] Example 7 In the same manner as in Example 1, a solid urethane resin (corresponding to the first portion) was placed at the bottom of the quadrangular pyramid structure of the microstructure liner, and then instead of applying an acrylic adhesive solution, an adhesive film (product name: FTW9953J, manufactured by 3M) was laminated onto the microstructure liner. The adhesive film was composed of a second liner, an adhesive layer (having unevenness on the second liner side) provided in order on the second liner, a polyvinyl chloride layer (thickness 100 μm) provided on the adhesive layer, a polyurethane transparent layer (thickness 20 μm) provided on the polyvinyl chloride layer, and a PET film provided on the polyurethane transparent layer. The lamination was performed by removing the second liner of the adhesive film, and in a state where the adhesive layer of the adhesive film faced the solid urethane resin on the microstructure liner, at 50° C. and a nip pressure of 2 kg / cm. 2 The study was carried out under the following conditions.

[0106] Next, after peeling off the PET film, a double-sided tape (product name: PSD-20, manufactured by 3M) made of acrylic foam tape with a thickness of 0.8 mm was laminated on the polyurethane transparent layer of the adhesive film. The lamination was performed at room temperature. In this way, the adhesive sheet of Example 7 was produced. When using the adhesive sheet, the liner and the microstructure liner of the double-sided tape were peeled off. When used, the adhesive sheet of Example 7 consists of a solid urethane resin (corresponding to the first part), an adhesive layer, a polyvinyl chloride layer provided on the adhesive layer, a polyurethane transparent layer and an acrylic foam tape layer provided on the polyvinyl chloride layer. The adhesive layer consists of a second part and a base that supports the second part. The polyvinyl chloride layer, the polyurethane transparent layer and the acrylic foam tape layer constitute a cushion layer.

[0107] Example 8 The first part was formed in the same manner as in Example 1, except that the solid content of the polyurethane solution was adjusted to 20 mass %. Then, a solid acrylic adhesive layer (thickness 35 μm) consisting of the second part and the base was formed in the same manner as in Example 1. Then, without laminating a carrier, a double-sided tape (product name: PSD-20, manufactured by 3M) consisting of an acrylic foam tape having a thickness of 0.8 mm was laminated onto the acrylic adhesive layer. The lamination was performed at room temperature.

[0108] In this way, the adhesive sheet of Example 8 was prepared. When the adhesive sheet was used, the liner and the microstructure liner of the double-sided tape were peeled off. When used, the adhesive sheet of Example 8 consisted of a solid urethane resin (corresponding to the first part), an adhesive layer, and a double-sided tape provided on the adhesive layer. The adhesive layer consisted of a second part and a base that supports the second part. The double-sided tape corresponded to the cushion layer.

[0109] Example 9 An adhesive sheet of Example 9 was produced in the same manner as in Example 8, except that the solids content of the polyurethane solution was adjusted to 10 mass % when forming the first portion.

[0110] (Reference example 1) A double-sided tape made of 0.8 mm thick acrylic foam tape (product name: PSD-20, manufactured by 3M) was cut to a size of 20 mm x 20 mm to prepare an adhesive sheet of Reference Example 1. When using the double-sided tape, the liner was peeled off.

[0111] (Evaluation Results) The adhesive sheets of Examples 1 to 9 and Reference Example 1 were subjected to the following evaluations.

[0112] (peel strength) The adhesive sheets of Examples 1 to 9 and Reference Example 1, cut to a size of 20 mm x 20 mm, were adhered to one of the plate-shaped portions of an L-shaped SUS plate consisting of two plate-shaped portions, and then the adhesive sheets were adhered to a bright annealed SUS plate (hereinafter, BA plate). Each adhesive sheet was sandwiched between one of the plate-shaped portions of the L-shaped SUS plate and the BA plate. In the adhesive sheets of Examples 1 to 9, the surface having the microstructure of the adhesive layer was adhered to the BA plate. The other plate-shaped portion of the L-shaped SUS plate extends perpendicularly to the one plate-shaped portion. The other plate-shaped portion of the L-shaped SUS plate protrudes from the BA plate through the adhesive layer in a direction toward one of the plate-shaped portions of the L-shaped SUS plate.

[0113] Next, a load of 0 kg (actually with a load due to the mass of the BA plate of 0.037 kg), 1 kg, 2 kg or 5 kg was applied from the BA plate side for 10 seconds to one plate-shaped portion of the L-shaped SUS plate, the adhesive layer and the BA plate. 10 seconds corresponds to the time that a normal user presses the adhesive sheet against the target. 1 kg and 2 kg correspond to the force that a normal user presses the adhesive sheet against the target. Then, using a tensile tester, the other plate-shaped portion of the L-shaped SUS plate was pulled up in the direction from the BA plate through the adhesive layer toward one plate-shaped portion of the L-shaped SUS plate. This measured the peeling force of each adhesive sheet. The peeling force is measured according to JIS Z 0237:2009 under conditions of a temperature of 23°C and a tensile speed of 300 mm / min. The peeling force corresponds to the action of a normal user peeling the adhesive sheet off the target again. The evaluation results are shown in Figures 18(a) to (d) and 19(a) to (b).

[0114] 18(a)-(d) and 19(a)-(b) are graphs showing the relationship between load and peeling force. FIG. 18(a) shows the peeling force (average integral value) of the adhesive sheets of Examples 1, 3, 5, 7 and Reference Example 1. FIG. 18(b) shows the peeling force (average integral value) of the adhesive sheets of Examples 2, 4, 6 and Reference Example 1. FIG. 19(a) shows the peeling force (average integral value) of the adhesive sheets of Examples 8, 9 and Reference Example 1. The average integral value is the average peeling force calculated by integrating the peeling force measured when peeling each adhesive sheet at 90° over a length of 20 mm. FIG. 18(c) shows the peeling force (maximum value) of the adhesive sheets of Examples 1, 3, 5, 7 and Reference Example 1. FIG. 18(d) shows the peeling force (maximum value) of the adhesive sheets of Examples 2, 4, 6 and Reference Example 1. FIG. 19(b) shows the peeling force (maximum value) of the adhesive sheets of Examples 8, 9 and Reference Example 1. The maximum value is the maximum peel force (peak value) measured when each adhesive sheet is peeled at 90° over a length of 20 mm. The straight lines in Fig. 18 show linear approximation lines of the respective data. The dotted line in Fig. 19 shows linear approximation lines of the data of Reference Example 1.

[0115] 18(a) and (c), the peel strength of the adhesive sheets of Examples 1, 3, 5, and 7 and Reference Example 1 increased with increasing load. At loads of 2 kg or less, the adhesive sheets of Examples 1, 3, 5, and 7 had a peel strength smaller than that of the adhesive sheet of Reference Example 1. At a load of 5 kg, the adhesive sheets of Examples 3, 5, and 7 had a peel strength smaller than that of the adhesive sheet of Reference Example 1, but the adhesive sheet of Example 1 had a peel strength larger than that of the adhesive sheet of Reference Example 1.

[0116] 18(b) and (d), the peel strength of the adhesive sheets of Examples 2, 4, and 6 and Reference Example 1 increased with increasing load. At loads of 5 kg or less, the adhesive sheets of Examples 2, 4, and 6 had a smaller peel strength than the adhesive sheet of Reference Example 1.

[0117] 19(a) and (b), at a load of 0 kg, the adhesive sheets of Examples 8 and 9 had a peel strength smaller than that of the adhesive sheet of Reference Example 1. On the other hand, at a load of 1 kg or 2 kg, the adhesive sheets of Examples 8 and 9 had a peel strength equivalent to that of the adhesive sheet of Reference Example 1.

[0118] As described above, the peeling force of the adhesive sheets of Examples 1 to 9 was very small at a load of 0 kg, but increased to some extent at loads of 1 to 5 kg. This is believed to be because, at a load of 0 kg, the solid urethane resin (corresponding to the first part) of the adhesive sheet contacted the BA plate, while at loads of 1 to 5 kg, the adhesive layer (corresponding to the second part and base) of the adhesive sheet contacted the BA plate. When the user is not pressing the adhesive sheet against the target (load of 0 kg), the adhesive sheet has high slidability against the target, and after the user presses the adhesive sheet against the target, the adhesive sheet can exhibit high adhesion to the target. Furthermore, the peeling force of the adhesive sheet can be adjusted by changing the material of the adhesive layer of the adhesive sheet, the solid content of the polyurethane solution for forming the solid urethane resin, etc.

[0119] (removability) The adhesive sheet of Example 7 (20 mm x 20 mm in size) was adhered to one of the two L-shaped SUS plates, and then the adhesive sheet was adhered to the surface of the target. The adhesive sheet is sandwiched between one of the L-shaped SUS plates and the surface of the target. The surface having the microstructure of the adhesive layer is adhered to the surface of the target. The other plate-shaped portion of the L-shaped SUS plate extends perpendicularly to the one plate-shaped portion. The other plate-shaped portion of the L-shaped SUS plate protrudes from the target through the adhesive layer in a direction toward the one plate-shaped portion of the L-shaped SUS plate. The target is a wooden desk with a varnished surface or a painted metal locker.

[0120] Next, a load of 1 kg was applied from the L-shaped SUS plate side to one plate-shaped portion of the L-shaped SUS plate, the adhesive layer, and the object for 10 seconds.

[0121] Next, using a digital force gauge (product name: RZ-50, manufactured by Aiko Engineering Co., Ltd.), the peel force (peak value) when peeling the adhesive sheet from the target was measured by pulling up one of the plate-shaped parts of the L-shaped SUS plate perpendicularly to the other plate-shaped part.

[0122] Next, the adhesive sheet of the sample measured above was adhered again to the target with a load of 1 kg for 10 seconds, and the peel force was measured when the adhesive sheet was peeled off from the target again. The adhesion and peeling operations were alternately repeated, and the peel force was measured 30 times. The adhesion and peeling operations were repeated without any interval. The evaluation results are shown in Figure 20.

[0123] Figure 20 is a graph showing the relationship between the number of repetitions (number of re-peeling attempts) and the peel force. When the number of repetitions is 0, the adhesive layer of the adhesive sheet is in contact with the target surface, but no load is applied. The dotted lines in Figure 20 indicate the linear approximation of each data.

[0124] As shown in FIG. 20, the peeling force of the adhesive sheet of Example 7 was 5N to 20N in the case of a desk and 10N to 20N in the case of a locker, at least up to 30 repetitions. For example, the force required to remove a portion of a roll-shaped item from a dispenser is less than 10N (usually less than 5N). For example, the force required to remove a portion of a sheet-shaped item (sticky note) from a dispenser is less than 15N (usually 10N or less) in the case of a sheet size of 75mm x 75mm. Therefore, when a dispenser is attached to the surface of a desk using the adhesive sheet of Example 7, the size of the adhesive sheet can be adjusted to exert a sufficient peeling force depending on the type of item. For example, in the case of a roll-shaped item, an adhesive sheet of 20mm x 20mm can be used. For example, in the case of a sheet-shaped item of 75mm x 75mm, an adhesive sheet of 20mm x 50mm can be used. In these cases, when removing a portion of a roll-shaped item or a sheet-shaped item from a dispenser, the adhesive sheet does not peel off from the object. Therefore, when a portion of a roll-like or sheet-like article is taken out of the dispenser, the dispenser is prevented from lifting up together with the portion of the roll-like or sheet-like article. In addition, when a user peels off the adhesive from the object to change the position, or peels off the adhesive from the object to replace or refill the contents, the adhesive can be used at least 30 times without significant decrease in peeling force in the peeling and adhering process. In addition, the adhesive sheet can be peeled off again from the desk by applying force to the dispenser to give the adhesive sheet a peeling force of more than 20 N per 20 mm x 20 mm. Similarly, when the condition that the peeling force of the adhesive sheet is greater than the force for removing the article is satisfied, the dispenser can be installed on a vertical surface, and repeated use can be achieved in the same manner. [Explanation of symbols]

[0125] 12a...surface, 12b...back surface (surface opposite to the surface), 2...top, 4,14...first portion, 5,15...second portion, 10,110,210,310,410...adhesive sheet, 10e...one end, 10m...center, 12,212...adhesive layer, 13,113...microstructure, 44a,44b...portion, 40,50,140...dispenser, 42s,52s,62s...bottom surface (outer surface), 60...case, 44...tape-like article (roll-like article), 44s...base sheet, 44t...adhesive layer, 54...laminated body (sheet-like article), 54a,54b,54c,54d,54e,54f...sticky notes (multiple portions), 64...article, 102,104...cushion layer.

Claims

1. A case body for storing items; an adhesive sheet provided on an outer surface of the case body; Equipped with The adhesive sheet has an adhesive layer having a microstructure on a surface thereof, the adhesive layer has a surface opposite to the front surface facing the outer surface; The microstructure includes a plurality of convex structures; The convex structure has two or more portions, a first portion at the top of the convex structure is made of a non-adhesive or first adhesive material, and a second portion at a distance from the top than the first portion is made of a second adhesive material having higher adhesiveness than the material of the first portion.

2. The case according to claim 1 , wherein the adhesive sheet further comprises a cushion layer provided on a surface opposite the surface of the adhesive layer.

3. the adhesive sheet extends in a first direction on the outer surface of the case body, The case according to claim 1 or 2, wherein a width of the adhesive sheet at one end in the first direction is smaller than a width of the adhesive sheet at a center in the first direction.

4. A dispenser for dispensing a portion separated from a sheet-like article that can be separated into a plurality of portions, the sheet-like article comprising a base sheet and an adhesive layer provided on at least a portion of a surface of the base sheet, the dispenser comprising: A dispenser, which is a case according to any one of claims 1 to 3.

5. The dispenser according to claim 4 , wherein the sheet-like product is a tape-like product.

6. The dispenser according to claim 4 , wherein the sheet-like article is a laminate including a plurality of stacked sticky notes.

7. An adhesive layer having a microstructure on its surface; a cushion layer provided on a surface of the adhesive layer opposite to the surface of the adhesive layer; Equipped with The microstructure includes a plurality of convex structures; The convex structure has two or more portions, a first portion at the top of the convex structure is made of a non-adhesive or first adhesive material, and a second portion below the first portion is made of a second adhesive material having higher adhesiveness than the material of the first portion.

8. the adhesive layer is a first adhesive layer, The adhesive sheet of claim 7 , wherein the cushioning layer comprises a second adhesive layer made of a third adhesive material different from the second adhesive material.

9. An adhesive layer having a microstructure on its surface, The microstructure includes a plurality of convex structures; The convex structure has two or more portions, a first portion at the top of the convex structure is made of a non-adhesive or first adhesive material, and a second portion below the first portion is made of a second adhesive material having higher adhesiveness than the material of the first portion, The second portion constitutes a cushion layer located on the side opposite the surface of the adhesive layer.

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