JP2002309195A - Pressure-sensitive adhesive sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a pressure-sensitive adhesive sheet which needs no release paper, is amenable to re-sticking, etc., is excellent in handleability, firmly sticks to an adherend, and does not peel therefrom once stuck. SOLUTION: At least either surface of a base 10 is provided with a water- insoluble pressure-sensitive adhesive material layer 11, and the surface of the layer 11 is coated with a water-soluble pressure-sensitive adhesive material layer 12 having no pressure sensitive adhesiveness in the ordinary state. By adding water to the layer at the time of sticking, it develops pressure-sensitive adhesiveness and becomes ready for sticking. By pressing the sheet 1 against the adherend 20 thereaftar, the layer 12 firmly sticks to an adherend as a result of the direct contact thereof with the surface of the adherend.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a sheet-like material in which a pressure-sensitive adhesive layer to be attached to the surface of an adherend is formed on at least one side of a sheet-like substrate (such a sheet-like material in the present specification). More specifically, the bonding surface to be bonded to the adherend has no tackiness in a normal state, but is configured to exhibit tackiness by impregnating with water. It relates to an adhesive sheet.

[0002] In this specification, the term "sheet" is a concept including a so-called "film" generally provided in the form of a roll.

[0003]

2. Description of the Related Art Floppy (registered trademark) discs and video tape cases, labels and stickers attached to product packaging, etc., wallpapers and sliding doors attached to walls, ceilings, doors, sliding doors, etc. for interior decoration purposes Paper, printed sheets and other sheet materials to be attached to signboards and store show windows for the purpose of decorative effects, etc., include, for example, these sheet materials as a base material, and at least one surface thereof is provided with an adhesive. There is an adhesive sheet provided with a layer.

[0004] As an example, the wallpaper will be described as an example of the above-mentioned pressure-sensitive adhesive sheet. Conventionally, the wallpaper is generally applied to a wall surface or a ceiling by applying an emulsion paste on the back surface. However, in recent years, for the purpose of reducing the complexity of such an adhesive application operation, an adhesive layer formed by applying an adhesive in advance on an adhesive surface with a wall surface has been used. I have.

[0005] As an example of a wallpaper having such an adhesive layer, an adhesive layer is formed on the back surface of a sheet-like substrate made of paper, woven fabric, nonwoven fabric, or the like, and the adhesive layer is formed of release paper. Apply the rewetting glue that exhibits adhesiveness by impregnating moisture to the coated or backside of the wallpaper, and wet the surface with this glue with water before attaching it to the wall or ceiling surface etc. As a result, there is a wallpaper that can be attached.

[0006]

Among the above-mentioned conventional wallpapers, the wallpaper obtained by covering the adhesive layer formed on one side of the base material with a release paper is used to immediately release the release paper. Has the advantage of being able to obtain the property, but it takes time and effort to peel off the release paper at the time of work, and also has the trouble that the release paper after peeling is scattered at the work site and must be collected and discarded. . In particular, release paper
Since the paper or the like is coated and impregnated with a silicone resin or the like for the purpose of improving the releasability, the impregnated silicon resin cannot be recycled by the same method as ordinary waste paper or the like. From the viewpoint of effective utilization of the paper, it is not preferable that such release paper is generated as dust, and it is desirable that such release paper that is difficult to reuse is not used as much as possible.

The above-mentioned pressure-sensitive adhesive sheet is inconvenient to handle once the release paper is peeled off because of its tackiness, and the pressure-sensitive adhesive layer exposed by peeling off the release paper makes the wallpaper permanent on the wall surface. Since it is for sticking, it has a strong adhesive force, and once sticking to a wall surface, there is a problem that it is difficult to stick again.

[0008] Therefore, when the wallpaper is bent at the time of sticking, bubbles are trapped between the wall surface and the wallpaper, or the wallpaper is stuck in a wrinkled state, it is difficult to correct this. Was.

On the other hand, in the case of wallpaper with rewetting glue, the adhesiveness is restored by applying water to the rewetting glue. Although it is easy to handle in that it has a weak force and can be easily re-applied for a while after application, the adhesive strength that appears depending on how water is applied can be uneven. Therefore, in order to apply water uniformly to such wallpaper relatively easily, a special device is required.

Further, since the rewetting paste is water-soluble, it dissolves by containing water again to weaken the adhesive strength. For example, when dew condensation or the like in which water droplets adhere to a wall surface in winter or the like occurs, The adhesive strength of the pressure-sensitive adhesive layer is weakened, and the wallpaper may be peeled off from this portion.

The adhesive surface of the pressure-sensitive adhesive layer is formed in a net shape so as to reduce the contact area with a wall surface or the like so that the wallpaper once adhered can be reattached. There is also a decorative sheet having a pressure-sensitive adhesive layer configured to strongly press the adhesive surface against the surface of the adherend so that the adhesive in the mesh portion contacts the adherend and exerts a strong adhesive force. (Japanese Patent Application Laid-Open No. 2001-80018).

In the case of this decorative sheet, the convenience of the sticking operation is improved in that the wallpaper once adhered can be re-attached. Since the release paper for protection is necessary, the trouble of peeling the release paper as in the above-described conventional technique is troublesome, and there is a problem that the release paper after peeling is generated as dust. I have.

Accordingly, the present invention has been made to solve the above-mentioned drawbacks in the prior art, and not only does not require the use of a release paper, and therefore, does not require the trouble of peeling the release paper. To provide a pressure-sensitive adhesive sheet that does not generate as dust, is easy to re-paste, has good workability and handleability, and adheres firmly after pasting and does not peel off due to moisture absorption or water content. Aim.

In the description of the prior art, the wallpaper is described as an example of the pressure-sensitive adhesive sheet. However, the field of application of the pressure-sensitive adhesive sheet of the present invention is not limited to the above-described wallpaper, but may be applied to various other pressure-sensitive adhesive sheets. The applicable points are as described above.

[0015]

In order to achieve the above object, the pressure-sensitive adhesive sheet 1 of the present invention comprises a substrate 10 provided with a water-insoluble pressure-sensitive adhesive layer 11 on at least one surface of the substrate 10 and the water-insoluble pressure-sensitive adhesive layer. 11 is characterized by being coated with a water-soluble pressure-sensitive adhesive layer 12 having no tackiness under normal conditions (claim 1).

As the water-soluble pressure-sensitive adhesive layer 12, various known water-soluble pressure-sensitive adhesives can be used, and polyvinyl alcohol-based, polyethylene oxide-based, polyvinylamide-based, polyvinylpyrrolidone-based, polyvinylacetal-based, and polyacrylic acid-based adhesives can be used. It can be formed by any one of pressure-sensitive adhesives based on cellulose, cellulose resin, gum arabic, gelatin, or starch (Claim 2).

When the substrate 10 is made of a plastic sheet such as PET, the surface of the substrate 10 opposite to the surface on which the water-insoluble pressure-sensitive adhesive layer 11 is formed is provided in order to impart printability. The particle size is 0.0
It is also possible to form the ink receiving layer 14 by applying and drying a paint comprising 50 to 200 parts by weight of a filler of 1 to 10 μm (claim 3).

Further, in the pressure-sensitive adhesive sheet 1, particularly when a plastic sheet is used as the substrate 10, it is preferable to form through holes 15 penetrating between both surfaces thereof at predetermined intervals (claim 4).

In the pressure-sensitive adhesive sheet 1 in which the through-holes 15 are formed, it is preferable to smooth the surface of the pressure-sensitive adhesive sheet 1 after the through-holes 15 are formed.
When the surface of the base material 10 made of a plastic sheet or the surface of the ink receiving layer 14 made of the resin paint described above is flattened,
For example, a heat calender roll is applied at a temperature equal to or lower than the plasticizing temperature of these resin materials to smooth them.

The filler added to the resin coating forming the ink receiving layer 14 is silica, alumina oxide,
Any one or more of calcium carbonate can be used (claim 6).

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described below with reference to the accompanying drawings. [Basic Configuration] As shown in FIG. 1, a pressure-sensitive adhesive sheet 1 of the present invention covers a water-insoluble pressure-sensitive adhesive layer 11 formed on at least one side of a substrate 10 and a surface of the water-insoluble pressure-sensitive adhesive layer 11. A water-soluble pressure-sensitive adhesive layer 12 which is non-adhesive under normal conditions and which is dissolved by contact with water to exhibit tackiness, and the pressure-sensitive adhesive surface 13 is a pressure-sensitive adhesive sheet 1 which does not exhibit tackiness in normal conditions. It is.

The pressure-sensitive adhesive sheet 1 thus obtained does not have a tacky surface in a normal state, so that it is excellent in storage and handling properties, and has a surface for the purpose of preventing dust from adhering to the pressure-sensitive adhesive surface 13 and preventing blocking. Since there is no need to attach a release paper or a protective film to the device, there is no trouble in peeling off the release paper or the like at the time of attachment, or when the release paper is generated as dust.

In the pressure-sensitive adhesive sheet 1 of the present invention provided with the water-soluble resin coating 12, when the pressure-sensitive adhesive sheet 1 is adhered to the surface of the adherend, the surface of the water-soluble pressure-sensitive adhesive layer 12 or the surface of the adherend is treated with water. , The water-soluble pressure-sensitive adhesive layer 12 exhibits tackiness by containing moisture, and can be attached to the adherend 20 by this tackiness (see FIG. 2).

The adhesive sheet 1 adhered to the surface of the adherend 20 by the adhesive force of the water-soluble adhesive layer 12 in this manner
Since the water-soluble pressure-sensitive adhesive layer 12 has a relatively low pressure-sensitive adhesive force, for example, the water-soluble pressure-sensitive adhesive layer 12 is adhered in a state where air is entrapped between the pressure-sensitive adhesive sheet and the adherend or in a state where the pressure-sensitive adhesive seal is wrinkled. In such a case, when it is necessary to re-paste, for example, when it cannot be pasted at an accurate position, it can be easily peeled off and re-applied to an appropriate position or state again.

Then, the pressure-sensitive adhesive sheet 1 is separated from the base material 10 by a roller 30 or the like, as shown in FIG.
0, the water-soluble pressure-sensitive adhesive softened with water is pushed away, and the water-insoluble pressure-sensitive adhesive layer 11 directly contacts the surface of the adherend 20, thereby causing the pressure-sensitive adhesive sheet 1 to be non-water-soluble. Due to the strong adhesive force of the pressure-sensitive adhesive layer 11, the adhesive layer 11 can be permanently attached to the surface of the adherend 20 (see FIG. 3).

The impregnation of water into the water-soluble pressure-sensitive adhesive layer 12 is as follows:
The pressure-sensitive adhesive sheet 1 can be directly immersed in water for spraying, and water can be sprayed on the surface of the water-soluble pressure-sensitive adhesive layer 12 by spraying, and further, water can be sprayed with a roller, cloth, brush or the like impregnated with water. Water may be applied to the surface of the adherend 20 that comes into contact with the water-soluble pressure-sensitive adhesive layer 12 by the same method.

Further, by adjusting the amount of water impregnated in the water-soluble pressure-sensitive adhesive layer 12, the degree of exposure of the water-insoluble pressure-sensitive adhesive layer 11 formed thereunder is varied, so that the pressure-sensitive adhesive sheet 1 Adhesion can also be adjusted.

The pressure-sensitive adhesive sheet 1 stuck on the surface of the adherend 20 as described above has a stronger water-soluble pressure-sensitive adhesive layer than the water-soluble pressure-sensitive adhesive layer 12. 1
1, the pressure-sensitive adhesive sheet 1 does not peel off from the surface of the adherend 20 even if the pressure-sensitive adhesive sheet 1 absorbs moisture or contains water. It is possible to maintain a proper adhered state.

When the pressure-sensitive adhesive sheet 1 of the present invention is used as a label or the like, a PET-based plastic sheet or the like often used as the label material can be used as the base material 10. Is generally higher in gas barrier property than paper,
Is glass, resin surface or the like having a high gas barrier, it is easy to embrace the air between the surface of the adherend 20 and the adhesive sheet 1, lacks aesthetic appearance, and expands the embraced air. And outgas from the adherend 20,
The thermal expansion of the base material 10 and the like are combined, and this is likely to cause swelling and peeling of the adhesive sheet 1.

For this reason, it is preferable that the base material 10 and the pressure-sensitive adhesive layers 11 and 12 of the pressure-sensitive adhesive sheet 1 have air permeability. As a method of imparting air permeability, when the plastic sheet as the base material is a stretched polyester or stretched polypropylene film, silica, aluminum oxide, calcium carbonate or the like having a particle size of 10 μm or less in the raw material resin of the base material 10 After adding the filler, the filler may be dropped at the time of stretching to form a through hole at the position where the filler has dropped, or a through hole may be formed in the base material with a needle or the like to allow air permeability. Alternatively, the through holes can be formed by various known methods.

Further, for example, in the case of the adhesive sheet 1 used as a label or the like to be affixed to the packaging of a product, the surface of the base material needs to be printable. It is preferable that it can be easily performed by a printer, a copying machine, or the like. From such a viewpoint, when a plastic sheet is used as the base material of the pressure-sensitive adhesive film 1 of the present invention, the base material 10 containing a filler such as silica, aluminum oxide, or calcium carbonate is added.
It is preferable to improve printability by using, for example, or applying a resin paint containing these fillers to the surface of the substrate 10.

In the present embodiment, when a plastic sheet is used as the substrate 10, the following processing is performed so that the adhesive sheet 1 can have both printability and air permeability. I am giving it.

First, as shown in FIG. 4, on a surface of a base material 10 such as a PET film, as an ink receiving layer 14, silica having a particle size of 10 μm or less, aluminum oxide,
A paint in which a filler such as calcium carbonate is blended in an amount of 50 to 200 parts by weight with respect to 100 parts by weight of the resin is applied and dried so that the thickness after drying is 4 to 15 μm, and printability is imparted.

Thus, the ink receiving layer 1 is formed on the surface.
In order to impart air permeability to the adhesive film 1 on which the adhesive sheet 4 is formed, a roll (needle roll) on which needles are implanted at a pitch of about 2 mm is brought into contact with the surface of the receiving layer 14 and rotated to rotate the adhesive sheet 1. A through hole 15 penetrating between both surfaces is formed (see FIG. 5). The formation pattern of the through-holes 15 can be formed in a regular shape, a staggered shape, or other various shapes.

The pressure-sensitive adhesive film 1 having the through-holes 15 formed in this manner is further subjected to a heat calender roll for the substrate 10.
The surface is smoothed at or below the plasticizing temperature of the resin constituting the ink receiving layer 14 (see FIG. 6).

A plastic sheet such as a stretched polyester, a stretched PP, or the above-described PET, which is a general label base material, is liable to peel off when the ink is directly printed on the surface thereof. It is common to overlay a transparent film such as the above. However, by forming the ink receiving layer 14 on the base material 10 as described above, a base material made of a material that is not easily compatible with the ink, such as a PET sheet, is used. Even when using material 1,
As with paper, it can be used with water-based ink, and can be printed by a commonly used printer or the like, and does not require an overlay film for preventing the ink from peeling off.

The formation of the through hole 15 allows the adherend 2
0 outgassing, pressure sensitive adhesive sheet 1 and adherend 2
However, even if there is an air embedment between them, the air is released to the atmosphere through the through-holes 15, so that the appearance after sticking is beautiful and the adhesive sheet 1 may be peeled off. Absent.

Next, preferred embodiments of the present invention will be described below.

In this embodiment, the pressure-sensitive adhesive sheet 1 is made of paper, woven fabric, or the like as a base material, and has a water-insoluble pressure-sensitive adhesive layer 11 formed on one surface thereof.
It is covered with the water-soluble pressure-sensitive adhesive layer 12 to form a wallpaper or a decorative sheet such as fusuma paper to be attached to a wall or a ceiling plate for the purpose of interior decoration or the like.

In FIG. 7, the decorative sheet 1 (adhesive sheet 1) of the present invention is provided with a decorative layer 17 for decorative effect on one side (upper side in FIG. 7) of the base material 10 if necessary. On the other surface (lower side in FIG. 7), a water-insoluble pressure-sensitive adhesive layer 11 that enables permanent adhesion to an adherend 20 such as a wall surface.
And a water-soluble pressure-sensitive adhesive layer 12 that covers the surface thereof and generates a lower adhesive force than the water-insoluble pressure-sensitive adhesive layer 11.

The material of the base material 10 is, for example, paper such as thin paper, titanium paper, resin-impregnated paper, paper between sheets, or woven or nonwoven fabric, or polyolefin, polyester, polyacryl, polyamide, or polychlorinated paper. vinyl,
One or more laminates such as sheets made of synthetic resin such as ethylene-vinyl acetate copolymer and saponified ethylene-vinyl acetate copolymer can be given, and in consideration of being used as wallpaper. Backing for ordinary wallpaper such as pulp-based flame-retardant paper impregnated with a water-soluble flame retardant such as sulfanylguanazine or guanidine phosphate, or inorganic paper mixed with an inorganic agent such as aluminum hydroxide or magnesium hydroxide What is called paper can be used.

When the above-mentioned synthetic resin sheet is used as a base material, aluminum hydroxide, magnesium hydroxide, calcium carbonate, barium carbonate, An inorganic filler composed of a mixture of one or more inorganic substances such as antimony and titanium oxide may be appropriately added. The thickness of the substrate is preferably 20 to 300 μm.

Examples of the material of the water-insoluble pressure-sensitive adhesive layer include rubbers such as natural rubber, styrene-butadiene latex, styrene-isoprene block copolymer, recycled rubber, and synthetic rubber, acrylics, and urethanes. Well-known pressure-sensitive adhesives such as silicone-based pressure-sensitive adhesives can be used. Further, the water-soluble pressure-sensitive adhesive layer is made of a polyvinyl alcohol (PVA) -based material that is water-soluble resin and exhibits tackiness by containing water. , Polyethylene oxide, polyvinyl aluminide, polyvinyl pyrrolidone,
Polyvinyl acetal, polyacrylic acid, gelatin, gum arabic, carboxymethyl cellulose (C
Known resin materials such as cellulosic resin materials such as MC) can be used, and these pressure-sensitive adhesives can be used if necessary.
Additives such as thickeners, dispersants, defoamers, fillers, antistatic agents and preservatives may be added.

These adhesives are applied in the form of a solvent type, an aqueous emulsion type, a hot melt type, a liquid curable type or the like by a known coating method such as a roll coating method, a gravure printing method, a melt extrusion method, etc. A water-soluble pressure-sensitive adhesive layer and a water-soluble pressure-sensitive adhesive layer are formed.

The coating thickness of the water-insoluble pressure-sensitive adhesive layer is 10 to 10
0 μm, more preferably 20 to 50 μm. Also,
The coating thickness of the water-soluble pressure-sensitive adhesive layer is 1 to 50 μm, more preferably 2 to 25 μm.

The decorative layer 17 is provided as necessary for the purpose of enhancing the interior decoration effect when the wallpaper as the adhesive sheet 1 is adhered to a wall or the like. When a high woven fabric or the like is used as a base material, it is not always necessary to provide the base material.

The decorative layer 17 may be, for example, a printed pattern layer such as a wood grain pattern, a foam layer for imparting a voluminous or three-dimensional appearance, or a scratch-resistant, abrasion-resistant or chemical-resistant surface on the decorative sheet. The surface protection layer imparting the surface physical properties described above, and a concavo-convex pattern formed by using an embossing plate can be cited as constituent elements, and these can be formed by appropriately combining these as necessary.

The wallpaper, which is the pressure-sensitive adhesive sheet 1 of the present invention formed as described above, has water-soluble pressure-sensitive adhesive layer 12 regained its tackiness when water is contained in water-soluble pressure-sensitive adhesive layer 12.
It becomes a state that can be adhered to the wall surface.

The adhesive force generated in the water-soluble pressure-sensitive adhesive layer 12 impregnated with water is weaker than the adhesive force of the non-water-soluble pressure-sensitive adhesive layer 11 under the water-soluble pressure-sensitive adhesive layer 12. Even if the wallpaper is pasted once, the wallpaper can be peeled off, so the water-soluble pressure-sensitive adhesive layer has the role of enabling temporary sticking before determining the sticking position of the wallpaper. . Therefore, even when a person unfamiliar with the wallpaper application operation performs the application operation, the application can be performed neatly, and the operation does not require skill.

When the sticking position of the wallpaper is determined by adjusting the sticking position of the wallpaper, the water-soluble adhesive is applied by applying pressure from the decorative layer 17 side to the wall or ceiling plate using a pressing roller or the like. Water-insoluble pressure-sensitive adhesive layer 11 covered by layer 12
Displaces the water-soluble pressure-sensitive adhesive layer 12 and comes into contact with the surface of the adherend 20 such as a wall surface or a ceiling plate, and is adhered to the surface of the adherend such as a wall or a ceiling plate with a stronger adhesive force.

[Test Example] The results of comparative tests on the workability of pasting and the adhesive strength after pasting are described below with respect to the comparative example between the wallpaper described above and the conventional wallpaper.

Example 1 of the present application First, a water-insoluble adhesive [manufactured by Soken Chemical Co., Ltd.] was prepared by transferring the film directly onto one surface of the substrate by a roll coating method or by applying it to process paper and transferring it to a thickness of 30 μm after drying. [SK Dyne 1551S]] and dried to form the water-insoluble pressure-sensitive adhesive layer 11, and then the process paper was dried to a thickness of 10%.
After coating and drying PVA by a roll coating method so as to have a thickness of μm, the water-insoluble pressure-sensitive adhesive layer 11
The water-soluble pressure-sensitive adhesive layer 12 was transferred to the upper surface to obtain a wallpaper as the pressure-sensitive adhesive sheet 1 of the present invention.

Comparative Example 1 An adhesive similar to the water-insoluble adhesive described in Example 1 of the present invention [SK Dyne Well manufactured by Soken Chemical Co., Ltd.] was applied to the silicone-coated surface of the release paper.
1717] is applied and dried by a roll coating method so that the thickness after drying is 30 μm, and the water-insoluble adhesive-coated surface of the release paper coated with the water-insoluble adhesive is applied to one surface of the substrate. By bonding, a wallpaper as an adhesive sheet with release paper was obtained.

Comparative Example 2 Water-soluble adhesive (PVA) was applied to the silicone-coated surface of release paper.
Is applied by a roll coating method so that the thickness after drying becomes 30 μm, and the water-soluble pressure-sensitive adhesive-coated surface of the release paper coated with the water-soluble pressure-sensitive adhesive is coated with a substrate before the tackiness disappears. After adhering to one surface of the substrate, the adhesive was dried to lose the adhesiveness, thereby obtaining a wallpaper as an adhesive sheet having a water-soluble adhesive layer formed on one surface of the substrate.

The workability and adhesiveness of the thus produced wallpaper of Example 1 of the present application and the wallpaper of Comparative Example 1 and Comparative Example 2 were observed when each was adhered to a gypsum board.

The workability was evaluated in terms of whether or not the adhesive sheet once adhered to the gypsum board could be easily peeled off, that is, whether or not it could be re-stretched. After adhering, the presence or absence of peeling of the pressure-sensitive adhesive sheet over time was observed.

The room where the test was carried out had a temperature of 30 ° C.
Humidity is 60%. In addition, water was sprayed on the water-soluble pressure-sensitive adhesive layer with a commercially available spray to develop the tackiness, and then applied to the wallpaper of Example 1 of the present application and Comparative Example 2. Table 1 shows the results of this comparative test.

[0058]

[Table 1]

As is clear from the results shown in Table 1,
The wallpaper which is the pressure-sensitive adhesive sheet of the present invention can be easily re-applied, and after pressing against the adherend, a strong adhesive force can be obtained by the water-insoluble pressure-sensitive adhesive layer, and peeling over time is also possible. No, it was confirmed that it could be used semi-permanently. Therefore, it was confirmed that the wallpaper having the advantages of each of the wallpaper with the release paper and the wallpaper with the rewetting paste described as the prior art and overcoming the disadvantages of both were obtained.

[0060]

According to the structure of the present invention described above, not only is there no need to use a release paper, and therefore, there is no need to remove the release paper, but also no release paper is generated as dust after the release. It was possible to provide a pressure-sensitive adhesive sheet which was easy to re-paste and had good workability and handleability, and which adhered firmly after pasting and did not peel off due to moisture absorption or water content.

Particularly, in the case of a pressure-sensitive adhesive sheet having an ink receiving layer formed on the surface of the substrate opposite to the surface on which the water-insoluble pressure-sensitive adhesive layer is formed, the case where the substrate is made of a plastic sheet is used. Even so, the printability is good and no overlay such as OPP is required.

Further, in the case of a pressure-sensitive adhesive sheet having through holes formed at predetermined intervals, even if a base material or a pressure-sensitive adhesive layer made of a material having poor air permeability is provided, air entrapment is prevented. As a result, it was possible to provide a pressure-sensitive adhesive sheet which not only has a beautiful appearance after application but also has no problem of peeling due to outgassing of an adherend or expansion of embraced air.

[0063]

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of an adhesive sheet.

FIG. 2 is a schematic cross-sectional view of an adhesive sheet showing a state of temporary attachment to an adherend.

FIG. 3 is a schematic cross-sectional view of the pressure-sensitive adhesive sheet, showing a process of pressure bonding to an adherend.

FIG. 4 is a schematic cross-sectional view of another pressure-sensitive adhesive sheet (wallpaper) of the present invention.

FIG. 5 is a schematic cross-sectional view of the pressure-sensitive adhesive sheet having a through hole (before surface flattening treatment).

FIG. 6 is a schematic cross-sectional view of the pressure-sensitive adhesive sheet having a through hole (after surface flattening treatment).

FIG. 7 is a schematic cross-sectional view of another pressure-sensitive adhesive sheet (wallpaper) of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Adhesive sheet 10 Substrate 11 Non-water-soluble adhesive layer 12 Water-soluble adhesive layer 13 Adhesive surface 14 Ink receiving layer 15 Through hole 17 Makeup layer 20 Adherend 30 Pressure roller

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4J004 AA04 AA05 AA06 AA08 AA10 AA11 AB02 CA04 CA06 CC02 CC03 CC07 CD07 CD10 FA01 GA01 4J040 BA011 BA101 BA191 DD001 DD071 DF011 DF091 DH031 EE011 JA02 JB01 MA03 MB03 JB02 NA05 NA06 NA12

Claims (6)

[Claims] 1. A water-insoluble pressure-sensitive adhesive layer is provided on at least one surface of a substrate, and the surface of the water-insoluble pressure-sensitive adhesive layer is covered with a water-soluble pressure-sensitive adhesive layer that is not tacky in a normal state. Adhesive sheet. 2. The water-soluble pressure-sensitive adhesive layer, wherein the polyvinyl alcohol-based, polyethylene oxide-based, polyvinylamide-based, polyvinylpyrrolidone-based, polyvinylacetal-based, polyacrylic acid-based, cellulose resin-based, gum arabic, gelatin-based, or The pressure-sensitive adhesive sheet according to claim 1, wherein the pressure-sensitive adhesive sheet is any of starch-based pressure-sensitive adhesives. 3. The base material is made of a plastic sheet, and the surface opposite to the surface on which the water-insoluble pressure-sensitive adhesive layer is formed has a particle size of 0.01 to 10 μm with respect to 100 parts by weight of the resin.
The pressure-sensitive adhesive sheet according to claim 1 or 2, wherein an ink-receiving layer is formed by applying and drying a paint comprising 50 to 200 parts by weight of the filler. 4. The pressure-sensitive adhesive sheet according to claim 1, wherein the pressure-sensitive adhesive sheet is formed with through holes penetrating between both surfaces thereof at predetermined intervals. 5. The pressure-sensitive adhesive sheet according to claim 4, wherein the surface of the pressure-sensitive adhesive sheet is smoothed after forming the through hole. 6. The pressure-sensitive adhesive sheet according to claim 3, wherein the filler comprises at least one of silica, alumina oxide, and calcium carbonate.