JP6553792B1 - Adhesive sheet - Google Patents

Abstract

An adhesive sheet having reworkability is provided. A decorative sheet 1 includes a base material 11 and a resin layer 12 as a surface layer sheet to be a surface after being attached, an adhesive layer 13 laminated on the back surface thereof, and a base material 11 and a resin layer 12 of the adhesive layer 13. And the peelable substrate sheet 14 laminated on the opposite side, and the adhesive layer 13 has a plurality of concave shapes 13a on both sides thereof. The concave shape 13a exerts an adsorbing action, thereby generating an adhesive force to the adherend and ensuring reworkability. [Selection] Figure 1

Description

  The present invention relates to an adhesive sheet.

When producing a decorative material, an adhesive is applied to a decorative sheet, and is laminated (attached) to wood or a non-combustible material.
In addition, it is possible to use an adhesive material instead of an adhesive material, but a decorative sheet in a form laminated using a conventional adhesive material is difficult to reuse such as re-peeling and re-adhering, for example, If the cosmetic material fails to be produced due to wrinkles at the time of pasting, it is necessary to peel off the decorative sheet and discard it, or to reuse the adherend, it is necessary to clean the adhesive layer remaining on the adherend surface. The For this reason, the preparation of the decorative material using the decorative sheet and the construction for attaching the decorative sheet require special equipment or require a skilled technique (person), which is difficult. it was high. Therefore, in order to make it easier to use the decorative sheet, it has been desired to improve the so-called reworkability in which, when pasting fails, it can be peeled off and pasted again as it is.
In addition to the decorative sheet, it is desired that the adhesive sheet having adhesiveness in various applications has high reworkability.

  On the other hand, Patent Document 1 discloses a technique relating to a micro-suction film composed of an adhesive layer having a large number of minute suction disks on the surface of the adherend. Since this micro sucker film can be reversibly attached to and peeled off from the adherend, if an adhesive layer comprising such a micro sucker film can be provided on the adhesive sheet, an adhesive sheet with reworkability and It is considered possible to However, although the composition disclosed in Patent Document 1 can produce a micro sucker film even at a temperature of about room temperature, a very long drying time is required when the applied composition is dried at room temperature. In reality, it was necessary to dry while heating. In many cases, the pressure-sensitive adhesive sheet is provided with a resin layer in which a concavo-convex shape is formed to enhance design, or a printing layer is provided. In a pressure-sensitive adhesive sheet having a resin layer, a printed layer, or the like, when heated during production for forming a micro-sucker film, the shape of the concavo-convex shape changes, and if it is severe, the concavo-convex shape disappears, or the resin layer or There is a possibility that the printed layer or the like may be damaged, and the composition cannot be applied to the pressure-sensitive adhesive sheet.

JP, 2017-36404, A

  An object of the present invention is to provide a pressure-sensitive adhesive sheet having reworkability.

  The present invention solves the above problems by the following solution means. In addition, in order to make an understanding easy, although the code | symbol corresponding to embodiment of this invention is attached | subjected and demonstrated, it is not limited to this.

  The first invention is the first sheet (10), the adhesive layer (13) laminated on the back surface of the first sheet (10), and the first sheet (10) of the adhesive layer (13). A second sheet (14) laminated on the opposite side, and the adhesive layer (13) is an adhesive sheet (1) having a plurality of concave shapes (13a) on both sides thereof.

  2nd invention is the adhesive sheet (1) as described in 1st invention, The said concave shape (13a) is equally formed in both surfaces of the said adhesion layer (13), The adhesive characterized by the above-mentioned. It is a sheet (1).

3rd invention is set to the average value of the diameter of each opening part of the said concave shape (13a) opened to the surface at the side of the said 1st sheet | seat (10) in the adhesive sheet (1) as described in 2nd invention. ^ave ₁ and then, the average value of the diameters of the openings of the second sheet (14) opening into side the concave shape (13a) when the _{^{D ave 2, | D ave 1}} -D ave 2 | / D ^It is an adhesive sheet (1) characterized by satisfying the relationship of ^ave ₂ ≦ 0.5.

  4th invention WHEREIN: In the adhesive sheet (1) in any one from 1st invention to 3rd invention, the layer thickness t of the said adhesive layer (13) exists in the range of 20 micrometers <= t <= 40 micrometers. And a pressure-sensitive adhesive sheet (1) characterized by

  According to a fifth aspect of the present invention, in the pressure-sensitive adhesive sheet (1) according to any one of the first to fourth aspects, the pressure-sensitive adhesive layer (13) includes bubbles in the liquid resin composition (130). The pressure-sensitive adhesive sheet (1) is characterized in that a plurality of the concave shapes (13a) based on the air bubbles are formed on both surfaces by drying.

  According to a sixth invention, in the pressure-sensitive adhesive sheet (1) according to any one of the first to fifth inventions, the first sheet (10) and the second sheet (14) are both peelable. It is an adhesive sheet (1) characterized by being comprised by a base material sheet (14).

  7th invention is the adhesive sheet (1) in any one from 1st invention to 5th invention, WHEREIN: The said 1st sheet | seat (10) is a surface layer sheet | seat (10) used as the surface after sticking. Yes, the second sheet (14) is a pressure-sensitive adhesive sheet (1), which is a peelable substrate sheet (14).

  The eighth invention is the pressure-sensitive adhesive sheet (1) according to the seventh invention, wherein the pressure-sensitive adhesive layer (13) is obtained by applying a liquid resin composition (130) to the peelable substrate sheet (14). The adhesive sheet (1) is characterized in that the surface layer sheet (10) is laminated and configured after drying.

  A ninth invention is characterized in that, in the pressure-sensitive adhesive sheet (1) according to the seventh invention or the eighth invention, the surface layer sheet (10) is formed of paper or a thermoplastic resin. Adhesive sheet (1).

  ADVANTAGE OF THE INVENTION According to this invention, the adhesive sheet provided with rework property can be provided.

It is a figure which shows 1st Embodiment of the decorative sheet by this invention. It is a figure which shows the form at the time of use of the makeup sheet 1 one by one. It is a figure which shows the manufacturing apparatus of the decorative sheet 1. FIG. It is a figure explaining the manufacturing method of the makeup sheet 1. FIG. It is the photograph which expanded the adhesive layer 13 of the decorative sheet 1 of the Example seeing from the direction of the to-be-adhered body side. It is the figure expanded in the cross section of the direction orthogonal to the sheet | seat surface of the adhesion layer 13 of the decorative sheet 1 of an Example. It is a figure which shows the peeling force of an Example and a comparative example. It is a figure which shows the observation result of the sample 1. FIG. FIG. 5 is a view showing an observation result of sample 2; FIG. 10 is a view showing an observation result of sample 3; FIG. 10 is a view showing an observation result of sample 4;

  Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings and the like.

(Embodiment)
FIG. 1 is a view showing a first embodiment of a decorative sheet according to the present invention.
In addition, each figure shown below including FIG. 1 is the figure shown typically, and the magnitude | size and shape of each part are exaggerated suitably for easy understanding.
In the following description, specific numerical values, shapes, materials, and the like are shown and described, but these can be changed as appropriate.
In this specification, the terms “plate”, “sheet”, “film” and the like are used, but these are generally used in the order of “thickness”, “plate”, “sheet”, “film”. I use it according to it even in writing. However, there is no technical meaning to such proper use, and these terms can be replaced as appropriate.
In the following description, as an example of the pressure-sensitive adhesive sheet, the first sheet is provided with a resin layer 12 having a concavo-convex shape (uneven pattern) on the surface that is exposed to the outside after being laminated with the base material 11, that is, the surface. The decorative sheet 1 composed of the surface layer sheet 10 will be described below. For example, various adhesive sheets including only the printing layer without including the resin layer 12 on the substrate 11 may be used. The resin layer 12 and the printing layer may be provided, or the resin layer 12 may not be provided on the base material 11 and only the uneven shape may be provided on the base material surface. The same configuration is applicable to various pressure-sensitive adhesive sheets other than the decorative sheet.

In the first embodiment illustrated in FIG. 1, the decorative sheet 1 includes a first sheet obtained by laminating a base material 11 and a resin layer 12, an adhesive layer 13, and a peelable base material sheet 14. ing.
The base 11 is a layer to be a base necessary for forming the resin layer 12. For example, paper may be used as the material of the substrate 11 or a resin sheet may be used as the material.

The resin layer 12 is laminated | stacked on the surface of the front side of the base material 11, and several uneven | corrugated shape is formed in the surface. For ease of understanding, the resin layer 12 shown in FIG. 1 is shown as a single layer, but the resin layer 12 may be composed of a plurality of layers having different compositions and structures. The uneven shape of the resin layer 12 may represent, for example, a conduit of wood, a surface uneven shape of a fabric, or an uneven shape of a stone. Form may be sufficient.
Examples of the resin forming the resin layer 12 include cellulose resin, polycarbonate resin, acrylic resin, styrene butadiene resin (styrene butadiene rubber), polyisoprene, natural rubber, ethylene propylene rubber (EPR), and ethylene propylene diene ternary copolymer. Combined rubber (EPDM), polynorbornene, polybutadiene, nitrile rubber, chloroprene rubber, butyl rubber, halogenated butyl rubber, ethylene-vinyl acetate rubber (EVA), polyurethane, silicone rubber, fluorine rubber, ethylene acrylic rubber, polyester elastomer, epichlorohydrin rubber, many Sulfurized rubber, chlorinated polyethylene, polyethylene, polystyrene, polyimide, polyvinyl chloride, polypropylene; polyolefin, polyurethane, polyester, poly Bromide system, and include polystyrene thermoplastic elastomer. In addition, you may use except resin illustrated above.

  In the present embodiment illustrated in FIG. 1, the first sheet 10 has been described by taking an example in which the base material 11 is directly laminated and laminated on the resin layer 12, but not limited thereto, For example, another layer may be provided between the substrate 11 and the resin layer 12. For example, a printing layer (pattern layer) on which a pattern is printed may be provided between the base material 11 and the resin layer 12, and all or part of the resin layer 12 may be made of a transparent resin.

The adhesive layer 13 is laminated on the surface of the substrate 11 opposite to the resin layer 12 (the lower surface in FIG. 1 is also referred to as the back surface side of the substrate 11). It is a layer having adhesiveness to the adherend 50 (see FIG. 2). The pressure-sensitive adhesive layer 13 includes a plurality of concave shapes 13a opened on both surfaces thereof. In addition, the adhesive layer 13 has elasticity, and each of the plurality of concave shapes 13a acts as a fine sucker. Therefore, the adhesive layer 13 can exert adhesive force (adsorptive power) on various adherends 50. (See FIG. 2 (c)).
The pressure-sensitive adhesive layer 13 is formed, for example, by a manufacturing method described later using a liquid resin composition (acrylic emulsion) disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 2017-36404). The layer thickness t of the adhesive layer 13 is desirably 1 μm or more and 500 μm or less. If the lower limit of the layer thickness range is not reached, formation of the concave shape becomes difficult, or the size of the concave shape becomes too small, and the adhesion (adsorption) characteristics are deteriorated. On the other hand, when the upper limit value of the layer thickness range is exceeded, the flexibility of the decorative sheet is lowered and workability is deteriorated.
Furthermore, in order to provide the concave shapes 13a evenly on both surfaces of the adhesive layer 13, the layer thickness t of the adhesive layer 13 is desirably in the range of 20 μm ≦ t ≦ 40 μm. This point will be described later.

The magnitude | size and density of the concave shape 13a of the adhesion layer 13 can be adjusted by changing the various conditions in the manufacturing process mentioned later. For example, the adhesive layer 13 can use the density of the adhesive layer 13 as an index representing the degree to which the concave shape 13a is included. The density of the adhesive layer 13 is not particularly limited, but can be, for example, 0.1 g / cm ³ or more and 0.6 g / cm ³ or less. Further, the size of the concave shape 13a is not particularly limited, but may be, for example, 1 μm or more and 300 μm or less.

  The 2nd sheet | seat 14 which is a peelable base material sheet is the opposite side to the base material 11 of the adhesion layer 13 (it is a surface used as the lower side in FIG. 1, and this is also called the back surface side of the adhesion layer 13). Is stacked on. The peelable substrate sheet 14 is provided in consideration of the handleability until the decorative sheet 1 is used, and the decorative sheet 1 is bonded to the adherend 50 when the decorative sheet 1 is used. It is peeled off at the time. As the peelable substrate sheet 14, various forms such as a conventionally known release film, separate paper, separate film, separate paper, release film, release paper and the like can be appropriately used. For example, a high-quality paper, a coated paper, an impregnated paper, a plastic film or the like having a release layer formed on one side or both sides may be used. The release layer is not particularly limited as long as it has a releasability. For example, silicone resin, organic resin-modified silicone resin, fluororesin, aminoalkyd resin, melamine resin, acrylic resin, polyester resin, etc. Can be mentioned. As these resins, any of emulsion type, solvent type or non-solvent type can be used. When a release film provided with a release layer is used, for example, a silicone release type PET (polyethylene terephthalate) film, an untreated PET film, a PP film, a silicone release type paper, or the like can be used.

For example, the thickness of the peelable substrate sheet 14 is preferably 10 μm or more and 100 μm or less, and more preferably 20 μm or more and 60 μm or less. If it is less than the lower limit value of the above-mentioned layer thickness range, there is no stiffness and peeling becomes difficult. When the thickness exceeds the upper limit of the above-mentioned layer thickness range, the hardness is too strong, and the workability at the time of attachment is reduced.
Moreover, as the peelable substrate sheet 14, a commercially available product may be used. For example, a 38 μm-thick polyester film (Mitsui Chemicals Tosero Co., Ltd.) that has been easily peeled with a silicone-based release agent on one side. (Trade name: SP-PET-01) and the like.

FIG. 2: is a figure which shows the form at the time of use of the decorative sheet 1 one by one.
The decorative sheet 1 described above includes a peelable base sheet 14 as shown in FIG. 2 (a). When the decorative sheet 1 is attached to the adherend 50, the peelable base sheet 14 is peeled off (FIG. 2 (b)). Then, by attaching the exposed adhesive layer 13 to the adherend 50 and applying an appropriate pressure to the surface thereof, a large number of concave shapes 13a existing on the exposed surface of the adhesive layer are elastically deformed, so that the conventional micro sucker It adsorbs (adheres) to the adherend 50 by the same action as the above (Fig. 2 (c)).
That is, due to the elastic deformation around the concave shape 13a, a force is exerted on the concave shape 13a to return from the deformed state to the original shape. By this force, the sealed space in the concave shape 13a becomes a negative pressure, and an adsorption action to the adherend 50 occurs. In addition, although the adsorption | suction force in the concave shape 13a single-piece | unit is weak, since many concave shape 13a is formed, the required adsorption | suction force can be ensured as a whole. In addition, when the pressure-sensitive adhesive layer 13 is manufactured, if the amount of the concave shape 13a is adjusted using, for example, the density as a parameter, the pressure-sensitive adhesive force (adsorptive power) of the pressure-sensitive adhesive layer 13 can be adjusted.

Next, a method of manufacturing the decorative sheet 1 will be described.
FIG. 3: is a figure which shows the manufacturing apparatus of the decorative sheet 1. As shown in FIG.
FIG. 4 is a view for explaining the method of manufacturing the decorative sheet 1.

  In order to manufacture the decorative sheet 1, first, the composition of the acrylic emulsion disclosed in Patent Document 1 for forming the adhesive layer 13 is placed in a stirrer, and nitrogen gas is mixed into the composition. Stirring is performed, and bubbles are included in the composition to produce a bubble-containing composition 130 (P1: foaming step in the figure).

  Next, the bubble-containing composition 130 is coated on the peelable substrate sheet (second sheet) 14 (P2 in the drawing: coating step). In the coating process, for example, a comma coater can be used, but other known coating methods may be used.

  When the bubble-containing composition 130 is coated on the peelable substrate sheet 14, the bubble-containing composition 130 is dried while being heated to form the adhesive layer 13 (P3 in the figure: drying step). In the drying step, for example, a drying oven having a temperature of about 60 ° C. to 140 ° C. can be used. As drying time, about 30 seconds-10 minutes can be illustrated, for example. In the drying step, drying may be promoted while blowing air to the bubble-containing composition 130. By performing a drying process, the concave shape 13a is formed on both surfaces of the bubble-containing composition 130, and the adhesive layer 13 is formed. The concave shape 13a is formed by breaking the bubbles contained in the bubble-containing composition 130 and leaving a part of the shape of the bubbles. Here, when bubbles are broken in a state where the curing of the bubble-containing composition 130 is insufficient, the concave shape 13a becomes difficult to remain. On the other hand, if the bubble-containing composition 130 is cured before the bubbles are broken, the concave shape 13 a may not be formed. Therefore, it is desirable that the drying process is performed under the condition that the bubble-breaking is performed in a state where the foam-containing composition 130 has been cured to some extent. Therefore, the temperature and the air flow rate in the drying step greatly affect the state of the concave shape 13a.

  After forming the adhesive layer 13 by a drying process, the surface layer sheet | seat (1st sheet) 10 provided with the base material 11 and the resin layer 12 which were prepared separately is joined with the adhesive layer 13 (P4 in a figure: Lamination process). In this laminating step, since the lamination is performed by the adsorption force (adhesive force) by the concave shape 13a of the adhesive layer 13, heating is unnecessary and the bonding is possible with a slight pressure. Therefore, damage is not given to the base material 11 and the resin layer 12 which are surface layer sheets.

When the laminating process is completed, the decorative sheet 1 is completed.
As described above, in the manufacture of the decorative sheet 1 of the present embodiment, the decorative sheet 1 can be efficiently manufactured without damaging the surface layer sheet due to heat at the time of forming the adhesive layer 13. Note that the decorative sheet may then be wound up in a roll shape or cut into a required size.

Next, an example in which the decorative sheet 1 of the present embodiment is actually produced is shown, and the result compared with the comparative example will be described.
In the decorative sheet 1 of the example, the foam-containing composition 130 having been subjected to the foaming process was applied onto a biaxially stretched PET film having releasability on the peelable substrate sheet 14 using a comma coater having a clearance of 200 μm. . The resultant was dried in a drying path at 100 ° C. for 1 minute to form an adhesive layer 13, and a surface layer sheet was laminated to obtain a decorative sheet 1. In addition, the density of the adhesion layer 13 in this case was 0.39 g / cm ³ and the thickness was 50 μm.
FIG. 5 is an enlarged photograph of the pressure-sensitive adhesive layer 13 of the decorative sheet 1 of the example as viewed from the adherend side.
FIG. 6 is an enlarged view of a cross section in a direction perpendicular to the sheet surface of the adhesive layer 13 of the decorative sheet 1 of the example.
As shown in FIGS. 5 and 6, it can be confirmed that the adhesive layer 13 is formed with a large number of concave shapes 13 a.

As Comparative Example 1, a decorative sheet produced in the same manner as in the above example was produced except that only the foam was not performed. The density of the adhesive layer after preparation was 0.87 g / cm ³ and the thickness was 100 μm.
As Comparative Example 2, a decorative sheet (referred to as Acrylic Adhesive A type) in which an adhesive layer was prepared using SK2094 manufactured by Soken Chemical Co., Ltd., which is an acrylic resin, was prepared.
As Comparative Example 3, a decorative sheet (referred to as Acrylic Adhesive B type) in which an adhesive layer was prepared using SK1502C manufactured by Soken Chemical Co., Ltd., which is an acrylic resin, was prepared.

The above four types of decorative sheets were prepared and compared for peeling force.
FIG. 7 is a view showing the peeling force of the example and the comparative example.
The peeling force in FIG. 7 is the result of measuring the peeling force at that time by performing 180 ° peeling at a pulling speed of 300 mm / min using a tensile tester. Moreover, the measurement of peeling force was performed immediately after sticking (0 hours) and 1000 hours after sticking.

In the example, it can be seen that peeling can be performed with relatively small peeling force both immediately after attachment and after 1000 hours. With such a peeling force, it will not be peeled off naturally, and can be easily peeled off if a force is applied to try to peel it off. In addition, since it is adsorbed by the concave shape 13a, there is no residue of the adhesive layer 13 on the surface of the adherend 50 after peeling, and there is no substantial change in the adhesive force (peeling force) of the adhesive layer 13 itself. It was possible to paste.
In Comparative Example 1, if it is a small piece, peeling can be performed with a relatively small peeling force, but if it is a large size, a certain amount of force is required for peeling. Further, after the peeling, an adhesive layer remained on the surface of the adherend, and complete reattachment was impossible.
Comparative Example 2 requires a certain amount of force for peeling in the case of a large size, and can be peeled off immediately after pasting, but after 1000 hours, the peeling force has increased significantly. Therefore, it was difficult to peel off manually, or the surface layer sheet could be damaged if peeled off forcibly.
In Comparative Example 3, the peel force was too large immediately after the attachment, and it was difficult to peel off manually, or the surface layer sheet could be damaged if peeled off forcibly.
Moreover, after peeling, neither Comparative Example 2 nor Comparative Example 3 was suitable for re-sticking because part of the adhesive material remained on the adherend or the adhesive strength was reduced. .

(Verification experiment about concave shape 13a of adhesion layer 13)
As described above, in the present invention, the concave shape 13a of the adhesive layer 13 greatly affects the adhesive force. If the concave shape 13a is not evenly provided on both surfaces of the adhesive layer 13, the adhesive force (adsorptive power) of one surface of the adhesive layer may be reduced or increased compared to the other surface. Further, by providing the concave shape 13a evenly on both surfaces of the pressure-sensitive adhesive layer 13, the physical properties of the pressure-sensitive adhesive layer 13 are also uniform, and the surface layer sheet (first sheet) and the peelable substrate sheet (second sheet), Or, it is preferable also from the viewpoint of expression of sufficient adhesiveness to both the surface layer sheet (first sheet) and the adherend and removability of the adherend.

  In order to uniformly provide the concave shape 13 a on both surfaces of the adhesive layer 13, it is important to control the application amount (layer thickness t) of the adhesive layer 13. In this regard, in Patent Document 1 (Japanese Patent Laid-Open No. 2017-36404), no consideration is given, and it is only necessary to form a micro suction cup. In Patent Document 1, in FIG. 2 (FIG. 2 of Patent Document 1), which is a cross-sectional photograph of Example 1 formed with a WET film thickness of 800 μm, a portion shown as a surface having a micro sucker has a fine sucker structure. However, in the portion shown as the surface peeled from the glass substrate, a configuration that seems to be a huge bubble that cannot be compared with the fine suction cup structure can be confirmed. That is, in the configuration of Patent Document 1, a micro suction cup (corresponding to the concave shape 13a in the present embodiment) is formed on one surface of the adhesive layer, but a micro suction cup (concave shape 13a) is formed on the other surface. Is not nearly formed.

This point was also verified by the present applicant.
As a verification experiment, four types of adhesive layer samples were prepared, and the concave shapes 13a on both sides thereof were observed with an SEM. The samples are the following four types.
Sample 1: Thickness t of adhesive layer t = 25 μm
Sample 2: Thickness t of adhesive layer t = 30 μm
Sample 3: Thickness t of adhesive layer t = 35 μm
Sample 4: Thickness t of adhesive layer t ≒ 2000 μm
The layer thickness of the above sample is the layer thickness after drying. Moreover, about the samples 1-3, the bubble-containing composition after a foaming process was coated on the glass surface using the coater, and the drying process was performed using a 100 degreeC drying furnace. Sample 4 was dropped onto the glass surface and naturally dried at room temperature. The reason for changing the drying conditions for Sample 4 is to verify that the normal temperature drying in Patent Document 1 is sufficient. Moreover, the density of the adhesion layer after a foaming process was 0.4 g / cm ³ in any sample.

FIG. 8 is a view showing an observation result of sample 1;
FIG. 9 is a view showing an observation result of sample 2.
FIG. 10 is a view showing an observation result of sample 3.
FIG. 11 is a view showing the observation result of the sample 4.
As shown in FIGS. 8 to 9, it was confirmed that the fine concave shapes 13a were uniformly formed on both surfaces of Sample 1 to Sample 3 in which the layer thickness t of the adhesive layer was controlled.
On the other hand, in the thick sample 4 shown in FIG. 11, an extreme difference is recognized in the size of the concave shape 13a between the dry surface and the glass side surface, and the same result as FIG. 2 of Patent Document 1 is obtained. It was done.
Therefore, in order to uniformly provide the concave shapes 13a on both surfaces of the adhesive layer 13, it can be determined that the thickness t of the adhesive layer 13 is desirably in the range of 20 μm ≦ t ≦ 40 μm.

Here, in more detail, it is desirable that the concave shape 13a is provided on both sides of the pressure-sensitive adhesive layer 13 to satisfy the following relationship in more detail.
The average value of the diameter of each opening of the concave shape 13a that opens to the surface on the surface layer sheet (first sheet) side is D ^ave _1, and each of the concave shapes 13a that open to the peelable substrate sheet (second sheet) side ^Assuming that the average value of the diameter of the opening is D ^ave ₂
| D ^ave ₁ −D ^ave ₂ | / D ^ave ₂ ≦ 0.5
It is desirable to satisfy
Also,
| D ^ave ₁ −D ^ave ₂ | / D ^ave ₂ ≦ 0.25
It is further desirable that the relationship
By satisfying these relationships, the difference in adhesive strength between both surfaces of the adhesive layer can be reduced, and the surface layer sheet (first sheet) and the peelable substrate sheet (second sheet) or the surface layer sheet ( Sufficient adhesion to both the first sheet) and the adherend and removability from the adherend can be exhibited well.
The average value of the diameters of the openings is practically impossible to determine the average of all the openings, and here, the openings having a large diameter within the observation range of 1500 μm × 1100 μm. The diameters of the three openings were measured in order, and the average value was obtained.

Here, the openings of the samples of FIGS. 8 to 11 were measured, and | D ^ave ₁ −D ^ave ₂ | / D ^ave ₂ was obtained. As a result, sample 1: 0.04 and sample 2: 0.06. Sample 3: 0.12 and sample 4: 0.69.

(Example of application)
In the above description, as a form of the pressure-sensitive adhesive sheet of the present invention, a decorative sheet that gives a desired design appearance to various adherend surfaces has been described as an example. Here, the decorative sheet has various applications in the finer classification, and the pressure-sensitive adhesive sheet of the present invention is applicable in these various applications. Furthermore, not only the decorative sheet, the pressure-sensitive adhesive sheet of the present invention can be applied to various uses. Hereinafter, the specific example which can apply the adhesive sheet of this invention suitably is illustrated.

(Decorative sheet for floor)
The pressure-sensitive adhesive sheet of the present invention can be applied as a floor decorative sheet. More specifically, for example, it is applied to a cushion floor, applied to an angle tile, applied to a non-slip sheet of a staircase, applied to a ridge, or a bath mat (a bathroom floor covering) or a kitchen mat. It can be applied to (kitchen floor coverings).
The ease of peeling and re-pasteable properties of the pressure-sensitive adhesive sheet according to the present invention can not only improve workability when building a house, but also renovate the interior by the resident himself after building the house, that is, simple remodeling. Can be easily installed. In addition, these decorative sheets for floors are adsorbed (adhered) to the adherend by the adsorbing force (adhesive force) due to the many fine concave shapes 13a, so that they can be easily peeled off, there is no adhesive residue, and the adherend Can also be easily restored to the state before the floor decorative sheet is attached.

(Wall decorative sheet)
The pressure-sensitive adhesive sheet of the present invention can be applied as a wall decorative sheet. More specifically, it can be applied to, for example, wallpaper, noncombustible board, gypsum board, calcium silicate board, concrete, aluminum board and the like.
The ease of peeling and re-pasteable properties of the pressure-sensitive adhesive sheet according to the present invention can not only improve workability when building a house, but also renovate the interior by the resident himself after building the house, that is, simple remodeling. Can be easily installed. In particular, the construction is simple because it is not necessary to use water glue as in the case of conventional wallpaper. In addition, since this wall decorative sheet is adsorbed (adhered) to the adherend by the adsorbing force (adhesive force) due to the numerous fine concave shapes 13a, it can be easily peeled off, there is no adhesive residue, and the adherend Can also be easily restored to the state prior to the application of the wall decorative sheet.

(Decorative sheet for ceiling)
The pressure-sensitive adhesive sheet of the present invention can be applied as a ceiling decorative sheet. The specific example of the decorative sheet for ceilings is the same as what was illustrated to the said decorative sheet for walls.
The ease of peeling and re-pasteable properties of the pressure-sensitive adhesive sheet according to the present invention can not only improve workability when building a house, but also renovate the interior by the resident himself after building the house, that is, simple remodeling. Can be easily installed. In particular, the construction on the ceiling is difficult if a normal wallpaper is used, but the construction is simple because it is not necessary to use water glue unlike the conventional wallpaper. Further, since this decorative sheet for ceiling is adsorbed (adhered) to the adherend by the adsorbing force (adhesive force) due to the numerous fine concave shapes 13a, it can be easily peeled off, there is no adhesive residue, and the adherend Can also be easily restored to the state before the ceiling decorative sheet is attached.

(Decorative sheet for joinery)
The pressure-sensitive adhesive sheet of the present invention can be applied as a decorative sheet for fittings.
The ease of peeling and re-pasteability of the pressure-sensitive adhesive sheet of the present invention can not only improve workability during the manufacture of joinery, but also work in refurbishment of the appearance of the joinery by the resident himself after building the house It can also enhance sex. Since this decorative sheet for joinery is adsorbed (adhered) to the adherend by the adsorbing force (adhesive force) of many fine concave shapes 13a, it can be easily peeled off, there is no adhesive residue, and the adherend is damaged. It is also possible to easily restore the state before attaching the decorative sheet for fittings.
Examples of the joinery to which the decorative sheet for joinery is attached include handrails, window frames (sashes), doors, door frames, brans, construction members (around edges, duck, waist walls, sills) and the like. , Or anything else.

(Furniture decorative sheet)
The pressure-sensitive adhesive sheet of the present invention can be applied as a decorative sheet for furniture. The ease of peeling and re-pasteability of the pressure-sensitive adhesive sheet of the present invention can not only improve the workability during furniture production, but also the workability in the work of refurbishing the exterior of the furniture by the user after purchasing the furniture. Can also be enhanced. Since this furniture decorative sheet is adsorbed (adhered) to the adherend by the adsorbing force (adhesive force) of the many fine concave shapes 13a, it can be easily peeled off, there is no adhesive residue, and the adherend is damaged. It is also possible to easily restore the state before the application of the decorative sheet for furniture.
Examples of the furniture that is the object to which the decorative sheet for furniture is attached include a table such as a desk and a table, a bowl, a shelf, and a bed, but any other type of furniture may be used.

(Exterior sheet)
The pressure-sensitive adhesive sheet of the present invention is not limited to use as various decorative sheets in the house described above, and may be used as an exterior sheet mainly used outdoors.
The ease of releasability and reattachability of the pressure-sensitive adhesive sheet of the present invention make it possible to enhance the workability of the temporary make-up operation of the exterior. Since this exterior sheet is adsorbed (adhered) to the adherend by the adsorbing force (adhesive force) of the many fine concave shapes 13a, it can be easily peeled off, there is no adhesive residue, and the adherend is damaged. Since it can prevent, it is also possible to restore easily to the state before affixing of the sheet | seat for exteriors.
As an object to be attached to the exterior sheet, for example, a moving object such as a vehicle may be used as an object to be attached in addition to an object related to a house such as an entrance door, various exteriors, windows, window frames, and outer walls. It may be one.

(Film for windows)
Further, the pressure-sensitive adhesive sheet of the present invention is not limited to those for interior and exterior, and may be used as a sheet for windows attached to windows. The window sheet may not only be a decorative sheet mainly for design, but also a functional sheet having various functions. As the functional sheet, for example, it may have a function of an optical filter that absorbs or reflects light in a specific wavelength range such as infrared rays and ultraviolet rays, may have a stainproof function, and has a known function. It can be assigned as appropriate. Further, it may be a decorative sheet having a decoration such as a stained glass pattern or a quad glass pattern.

(Other uses of adhesive sheet)
The pressure-sensitive adhesive sheet of the present invention may be applied to a label, a seal, and a patch. Since various packaging containers, especially containers such as PET bottles and glass bottles, are required to easily separate the label and the container when discarding or collecting and recycling waste products, they are preferably used for such applications. it can.
You may apply the adhesive sheet of this invention to the writing surface formation sheet which can provide the function of a white board (white board) or a blackboard simply by sticking. Thereby, various wall surfaces can be used as a whiteboard surface or the like, and can be easily returned to the original state.

The pressure-sensitive adhesive sheet of the present invention can be used for posters and various advertisement displays. Thereby, it is possible to display an advertisement or the like on any wall surface and easily return to the original state without any adhesive remaining on the adherend.
The pressure-sensitive adhesive sheet of the present invention can be used for sun visor films and anti-fogging films that are attached to windows of buildings and various vehicles to adjust the amount of transmitted light. As a result, the user can not only provide the sun visor or the anti-fogging function according to his / her preference but also easily return to the original state.

The pressure-sensitive adhesive sheet of the present invention can be used for menus, price tags, barcodes, and the like. This is suitable for applications such as changing the menu every month, or temporarily changing price tags or barcodes.
The pressure-sensitive adhesive sheet of the present invention can be used for the flap (lid) portion of an envelope or a box. This makes it possible to simply seal and realize an openable envelope or box.
There may be a primer layer that improves the adhesion between the base material such as the sheet and the pressure-sensitive adhesive sheet, and the primer layer is easier to use if it is on the base material side, and the material, thickness, etc. of the primer It does not matter.

The pressure-sensitive adhesive sheet of the present invention may be used on the entire surface or a part of a tag. Since the pressure-sensitive adhesive sheet of the present invention can easily make a pressure-sensitive adhesive force, it is possible to easily realize a stickable sticky note having a pressure-sensitive adhesive force according to the application. Moreover, you may use the adhesive sheet of this invention for a destination display board, a name tag, etc. as a utilization form close | similar to a tag.
The pressure-sensitive adhesive sheet of the present invention is used for various functional sheets that exhibit various functions such as antireflection, electromagnetic wave shielding, optical filter, widening or limiting viewing angle, and antistatic, which are attached to the display surface of various display devices. Can. These various functional sheets may be pasted at the time of manufacturing a display device in a factory or the like, or may be separately purchased and pasted by a user of the display device.

You may use the adhesive sheet of this invention for the curing tape and masking tape which are used in the case of various processes, such as coating.
The pressure-sensitive adhesive sheet of the present invention may be used for a surface fastener sheet, a surface fastener tape or the like used as a surface fastener. In addition, the pressure-sensitive adhesive sheet of the present invention may be used in a dressing as a form of use similar to a surface fastener.

The pressure-sensitive adhesive sheet of the present invention may be used for a sheet-like vehicle-mounted antenna or vehicle-mounted sensor.
You may use the adhesive sheet of this invention for forms, such as a delivery slip. Thereby, for example, after delivery is completed, the form can be peeled off and the delivery box can be reused.
The pressure-sensitive adhesive sheet of the present invention may be used for tablecloths, tiles and the like that require slip prevention. Since the adhesive sheet of the present invention is adsorbed (adhered) to the adherend by the adsorbing force (adhesive force) of the fine concave shape 13a, it can exhibit a sufficient anti-slip effect.

  The pressure-sensitive adhesive sheet of the present invention is not limited to a usage form in which the first sheet remains after being applied, as in the above-described decorative sheet, but a form in which only the pressure-sensitive adhesive layer is finally left on the adherend, that is, a double-sided (adhesive) tape It may be used as In that case, it is good to comprise both the 1st sheet | seat and 2nd sheet | seat arrange | positioned so that an adhesion layer may be pinched | interposed with a peelable base material sheet.

As described above, in the decorative sheet (adhesive sheet) 1 of the present embodiment, a plurality of concave shapes based on bubbles are formed on both surfaces of the adhesive layer 13. Therefore, it can be set as a decorative sheet in the form of an adhesive sheet without heating the surface layer sheet, and can be easily manufactured without damaging the surface layer sheet.
In addition, since the adhesive force of the adhesive layer 13 is due to the attractive force of the concave shape 13a, the reworkability is high, and even if the pasting fails, it is easy to reattach and easy to use.
Furthermore, since the concave shape 13a has a fine size and is provided in a large number, even if there are some irregularities on the surface of the adherend, an adhesive force (adsorption force) can be exhibited.
Furthermore, since a phenomenon such as adhesive residue does not occur on the surface of the adherend after the decorative sheet 1 is peeled off, there is no need for cleaning, and re-adhesion can be performed as it is. It is good.
In addition, since the decorative sheet (adhesive sheet) 1 of this embodiment can form the adhesive layer 13 without heating, the adhesive sheet can be formed using various types of surface layer sheets including a heat-sensitive surface layer sheet. It is possible to configure

(Modified form)
The present invention is not limited to the embodiment described above, and various modifications and changes are possible, and these are also within the scope of the present invention.

(1) In the embodiment, the example of the decorative sheet provided with the resin layer has been described and the adhesive sheet has been described. However, the present invention is not limited thereto, and, for example, a normal printed matter such as a poster may be used as the form of the adhesive sheet. .

(2) In the embodiment, the configuration of the surface layer sheet has been described with an example of a configuration including a base material and a resin layer. For example, the surface layer sheet may be a single layer or a more complicated configuration of three or more layers. Moreover, the raw material of the surface layer sheet may be composed of paper, a thermoplastic resin, or the like in addition to the examples given in the examples.

  In addition, although each embodiment and modification can also be used combining suitably, detailed description is abbreviate | omitted. Further, the present invention is not limited by the embodiments described above.

1 makeup sheet 10 surface sheet (1st sheet)
11 Substrate 12 Resin layer 13 Adhesive layer 13a Concave shape 14 Peelable substrate sheet (second sheet)
50 Adherend 130 Bubble-Containing Composition

Claims (6)

The first sheet,
An adhesive layer laminated on the back surface of the first sheet,
A second sheet laminated on the opposite side of the adhesive layer from the first sheet;
Equipped with
The adhesive layer has a plurality of concave shapes on both sides thereof ,
The concave shape is uniformly formed on both sides of the adhesive layer,
An average value of the diameters of the concave openings opening on the surface on the first sheet side is D ^ave _1, and an average value of the diameters of the concave openings opening on the second sheet side is D when the ^ave _2,
| D ^ave ₁ −D ^ave ₂ | / D ^ave ₂ ≦ 0.5
Adhesive sheet that meets the relationship of In the pressure-sensitive adhesive sheet according to claim 1 ,
The thickness t of the adhesive layer is in the range of 20 μm ≦ t ≦ 40 μm,
A pressure-sensitive adhesive sheet characterized by In the pressure-sensitive adhesive sheet according to claim 1 or 2 ,
The adhesive layer has a plurality of the concave shapes based on the bubbles formed on both sides by drying the liquid resin composition including bubbles.
A pressure-sensitive adhesive sheet characterized by In the pressure-sensitive adhesive sheet according to any one of claims 1 to 3 ,
The first sheet is a surface sheet which becomes a surface after pasting,
The second sheet is a peelable substrate sheet,
A pressure-sensitive adhesive sheet characterized by In the pressure-sensitive adhesive sheet according to claim 4 ,
The adhesive layer is constituted by laminating the surface layer sheet after applying and drying a liquid resin composition on the peelable substrate sheet,
A pressure-sensitive adhesive sheet characterized by In the pressure-sensitive adhesive sheet according to claim 4 or 5 ,
The surface sheet is made of paper or thermoplastic resin,
A pressure-sensitive adhesive sheet characterized by