JP2011207950A - Adhesive sheet and method for producing adhesive sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an adhesive sheet, which requires a small amount of water to be used for sticking, has excellent water retaining property in an initial stage of a sticking process and excellent water discharging property when pressed to adhere the adherend, and has an excellent appearance with hardly visible through holes, and to provide a method for producing the adhesive sheet.SOLUTION: The adhesive sheet 1 includes a substrate 11 and an adhesive layer 12, in which a plurality of through holes 2 penetrating from one surface to the other surface are formed, and is to be stuck by using water upon sticking. The pore diameter dof the through hole 2 on the surface 1A of the substrate 11 ranges from 20 to 80 μm, while the pore diameter dof the through hole 2 on an adhesive surface 1B of the adhesive layer 12 ranges from 10 to 60 μm. A ratio (d/d) of the pore diameter dof the through hole 2 on the surface 1A of the substrate 11 to the pore diameter dof the through hole 2 on the adhesive surface 1B of the adhesive layer ranges from 1.2 to 4.0.

Description

  The present invention relates to a pressure-sensitive adhesive sheet that is affixed using water at the time of application, and that can prevent or remove air accumulation, and a method for producing the pressure-sensitive adhesive sheet.

  For adhesive sheets with large dimensions, such as decorative films, marking films, and glass shatterproof films, which are pasted on adherends such as windows, the adhesive sheet may have wrinkles when applied, or between the adherend and the adhesive surface. In some cases, air may be trapped and the appearance of the pressure-sensitive adhesive sheet may be impaired. In addition, since it is difficult to align the adhesive sheet with the adherend, it may be necessary to re-attach the adhesive sheet. In this case, the adhesive sheet may be torn, the adhesive sheet may be wrinkled, Problems such as lowering often occur. In order to prevent these problems, it is performed that water is applied to the entire surface of the adherend and / or the adhesive surface in advance.

  However, since a large amount of water is used in the above work, there is a problem that the periphery of the adherend is immersed in water. For example, when the adherend is a window, the floor under the window is immersed in water.

  On the other hand, Patent Document 1 discloses a pressure-sensitive adhesive sheet composed of a decorative sheet, a pressure-sensitive adhesive layer, and a release paper, and is provided with a through-hole penetrating the decorative sheet and the pressure-sensitive adhesive layer. According to this pressure-sensitive adhesive sheet, it is possible to prevent air accumulation in the pressure-sensitive adhesive sheet by drawing air on the pressure-sensitive adhesive surface side from the through hole to the pressure-sensitive adhesive sheet surface side.

Japanese Utility Model Publication No. 1-125345

  However, since the hole diameter of the through hole in the pressure-sensitive adhesive sheet according to the example of Patent Document 1 is 0.01 mm (100 μm) and the through hole is a hole opened by a needle, the pressure-sensitive adhesive sheet is attached to a window, for example. In that case, the through holes were conspicuous, and the appearance of the pressure-sensitive adhesive sheet was not good. In addition, when the pressure-sensitive adhesive sheet is pasted using water, water between the adherend and the pressure-sensitive adhesive surface immediately escapes from the through hole, and the pressure-sensitive adhesive sheet is likely to have wrinkles. May be difficult to align with the adherend, and even if the pressure-sensitive adhesive sheet is pressure-bonded to the adherend, water may remain in the through-hole and adversely affect the adhesiveness. It was.

  The present invention has been made in view of such a situation, and the amount of water to be used at the time of application is small, and the water retainability at the initial stage of the application process and the drainage at the time of pressure bonding to the adherend. An object of the present invention is to provide a pressure-sensitive adhesive sheet that is excellent and has an excellent appearance with no through-holes, and a method for producing the pressure-sensitive adhesive sheet.

  In order to achieve the above object, first, the present invention includes a base material and an adhesive layer, and a plurality of through-holes penetrating from one surface to the other surface are formed, and water is used at the time of application. A hole diameter of the through hole on the surface of the base material is 20 to 80 μm, and a hole diameter of the through hole on the pressure-sensitive adhesive surface of the pressure-sensitive adhesive layer is 10 to 60 μm, Provided is a pressure-sensitive adhesive sheet, wherein a ratio of a hole diameter of the through-hole in the pressure-sensitive adhesive surface of the pressure-sensitive adhesive layer to a hole diameter of the through-hole in the surface of the base material is 1.2 to 4.0 (invention). 1).

  In this specification, “sheet” includes the concept of film, and “film” includes the concept of sheet. In the present invention, the “surface of the substrate” means a surface opposite to the surface in contact with the adhesive layer in the substrate, and the “adhesive surface of the adhesive layer” means that the adhesive layer is attached. The surface that contacts the body (the surface opposite to the base material).

  According to the present invention (Invention 1) in which the hole diameter of the through-hole and the ratio of the hole diameter on the substrate surface / adhesive surface are defined as described above, the water used when the adhesive sheet is applied is adhered to the adherend in the initial stage of the application process. Between the adhesive surface and the adhesive surface, and it is easy to align the adhesive sheet to the adherend, and in combination with the air between the adherend and the adhesive surface coming out of the through hole, The amount of water used is small, and it is possible to effectively prevent wrinkles from entering the adhesive sheet. Furthermore, the used water is easily removed from the through-holes by pressure-bonding the pressure-sensitive adhesive sheet to the adherend, and a decrease in the adhesive strength due to water remaining in the through-holes is prevented. Moreover, the said through-hole is not conspicuous on the base-material surface, Therefore, an adhesive sheet becomes a thing excellent in the external appearance.

  In the said invention (invention 1), it is preferable that the distance between the center of one through-hole and the center of the other through-hole adjacent to the said one through-hole is 1-15 mm (invention 2). .

  In the said invention (invention 1 and 2), it is preferable that the surface roughness (Ra) of the surface of the said base material is 0.7-15 micrometers (invention 3).

  In the said invention (invention 1-3), it is preferable that the said base material is provided with the decoration layer (invention 4).

  In the said invention (invention 4), it is preferable that the said decoration layer displays a color-coded pattern of two or more colors (invention 5).

  In the said invention (invention 1-5), the peeling material which the said through-hole does not penetrate may be laminated | stacked on the adhesion surface of the said adhesive layer (invention 6).

  In the said invention (invention 6), it is preferable that the said peeling material is equipped with the peeling base material which consists of paper, and the polyolefin layer provided in the said peeling base material (invention 7).

  In the said invention (invention 1-7), it is preferable that the said through-hole is formed by laser processing (invention 8).

  2ndly, this invention is a manufacturing method (invention 1-8) of the said adhesive sheet, Comprising: The said through-hole is formed by performing laser processing from the surface side of the said base material, The adhesive sheet characterized by the above-mentioned. A manufacturing method is provided (Invention 9).

  According to the pressure-sensitive adhesive sheet of the present invention, by defining the hole diameter of the through-hole and the ratio of the hole diameter on the substrate surface / adhesive surface, the amount of water used at the time of application is small, and in the initial stage of the application process It is excellent in water retention and drainage during pressure bonding to the adherend, and the through-holes are not noticeable and the appearance is excellent. Furthermore, according to the manufacturing method of the adhesive sheet which concerns on this invention, the above adhesive sheets can be manufactured easily.

It is sectional drawing of the adhesive sheet which concerns on one Embodiment of this invention. It is a partial expanded sectional view of the adhesive sheet which concerns on the same embodiment. It is a figure which shows an example of the manufacturing method of the adhesive sheet which concerns on one Embodiment of this invention. It is a figure which shows the arrangement | sequence of the through-hole formed in the Example. It is a figure (color) which shows the pattern printed on the base material in an Example.

Hereinafter, embodiments of the present invention will be described.
[Adhesive sheet]
FIG. 1 is a cross-sectional view of an adhesive sheet according to an embodiment of the present invention.

  As shown in FIG. 1, the pressure-sensitive adhesive sheet 1 according to this embodiment is formed by laminating a base material 11, a pressure-sensitive adhesive layer 12, and a release material 13. However, the release material 13 is peeled off when the pressure-sensitive adhesive sheet 1 is used.

  In this pressure-sensitive adhesive sheet 1, a plurality of through-holes 2 penetrating the base material 11 and the pressure-sensitive adhesive layer 12 and extending from the base material surface 1A to the pressure-sensitive adhesive surface 1B are formed. When the pressure-sensitive adhesive sheet 1 is used, air between the adherend and the pressure-sensitive adhesive surface 1B of the pressure-sensitive adhesive layer 12 escapes to the outside of the base material surface 1A through the through-hole 2 and prevents air accumulation as will be described later. Or the generated air pocket can be easily removed.

Here, the enlarged view of the through-hole 2 is shown in FIG. In this embodiment, the hole diameter (d ₂ ) of the through hole 2 on the substrate surface 1A is 20 to 80 μm, preferably 40 to 70 μm, and the hole diameter (d ₁ ) of the through hole 2 on the adhesive surface 1B is 10 to 10 μm. The ratio (d ₂ / d ₁ ) of the hole diameter (d ₁ ) of the through-hole 2 in the adhesive surface 1B to the hole diameter (d ₂ ) of the through-hole 2 in the substrate surface 1A is 60 μm, preferably 20 to 50 μm. .2 to 4.0, preferably 1.2 to 3.0. That is, the hole diameter (d ₁ ) of the through hole 2 on the adhesive surface 1B is smaller than the hole diameter (d ₂ ) of the through hole 2 on the substrate surface 1A, and preferably, as shown in FIG. The through hole 2 is formed so that the hole diameter of 2 gradually decreases from the substrate surface 1A to the adhesive surface 1B.

Since the through-hole 2 has the hole diameter (d ₁ , d ₂ ) and the ratio (d ₂ / d ₁ ) as described above, the water used when the pressure-sensitive adhesive sheet 1 is applied is adhered to the adherend in the initial stage of the application process. Between the adherend 1 and the adhesive surface 1B, the positioning of the adhesive sheet 1 with respect to the adherend is facilitated, and the air between the adherend and the adhesive surface 1B escapes from the through hole 2. As a result, the amount of water used is small, and the entry of wrinkles into the pressure-sensitive adhesive sheet 1 is effectively prevented. Furthermore, the used water is easily removed from the through hole 2 by press-bonding the pressure-sensitive adhesive sheet 1 to the adherend (excelling in drainage), and a decrease in adhesive force due to water remaining in the through hole 2 is prevented. . Further, the through-hole 2 having the above-described hole diameter (d ₁ , d ₂ ) and its ratio (d ₂ / d ₁ ) is hardly noticeable on the substrate surface 1A, and therefore the pressure-sensitive adhesive sheet 1 has an excellent appearance. It becomes.

  As the amount of water used when the adhesive sheet 1 is applied, for example, when the adhesive sheet 1 is applied to a window, an amount of water that does not hang from the adhesive sheet 1 and / or the window is sufficient. The amount of water remaining after wiping the window with a cloth containing suffices.

When the hole diameters (d ₁ , d ₂ ) of the through holes 2 are smaller than the above, it is difficult for air and water to escape from the through holes 2. On the other hand, if the hole diameters (d ₁ , d ₂ ) of the through holes 2 are larger than the above, the through holes 2 are easily noticeable on the substrate surface 1A, and the appearance of the pressure-sensitive adhesive sheet 1 is impaired. Further, in the initial stage of the sticking process, water between the adherend and the adhesive surface 1 </ b> B is immediately removed from the through-hole 2, so that the adhesive sheet 1 is likely to be wrinkled or the adhesive sheet 1 is attached to the adherend. Alignment is difficult or requires a lot of water.

When the ratio (d ₂ / d ₁ ) of the hole diameter (d ₁ ) of the through-hole 2 in the adhesive surface 1B to the hole diameter (d ₂ ) of the through-hole 2 in the substrate surface 1A is larger than the above, the wall surface of the through-hole 2 And the through hole 2 is easily noticeable on the substrate surface 1A. When the ratio (d ₂ / d ₁ ) is smaller than the above (d ₂ / d ₁ ≈1, d ₂ ≈d ₁ ), dust or the like tends to accumulate in the through hole 2, and the ratio (d ₂ / d ₁ ) Is further reduced (d ₂ / d ₁ <1, d ₂ <d ₁ ), the water does not escape from the through-hole 2 even after the pressure-sensitive adhesive sheet 1 is pressure-bonded to the adherend, and water does not enter the through-hole 2. Clouding, thereby reducing the adhesive strength.

  The distance (inter-hole distance) between the center of one through hole 2 and the center of another through hole 2 adjacent to the one through hole 2 is preferably 0.5 to 15 mm, particularly 1 It is preferably ~ 12 mm. If the distance between the holes is less than 0.5 mm, the water between the adherend and the adhesive surface 1B will immediately escape from the through-hole 2 and a large amount of water is required, or the adhesive sheet 1 is wrinkled. It may become easy, and it may become difficult to align the adhesive sheet 1 with the adherend, and the mechanical strength of the adhesive sheet 1 may be reduced. On the other hand, if the distance between holes exceeds 15 mm, air and water may not easily escape.

  The through hole 2 is preferably formed by laser processing described later. According to laser processing, a through hole that satisfies the above-described conditions can be easily formed. However, the formation method of the through-hole 2 is not limited to this, For example, you may form by a water jet, a micro drill, a precision press, a hot needle, a molten hole, etc.

  The material of the base material 11 is not particularly limited as long as it is a material that can form the through-hole 2 as described above. For example, a resin film, a metal film, a resin film on which a metal is deposited, and a laminate thereof The body etc. can be used.

  Examples of the resin film include polyolefins such as polyethylene and polypropylene, polyesters such as polyethylene terephthalate and polybutylene terephthalate, polyvinyl chloride, polystyrene, polyurethane, polycarbonate, polyamide, polyimide, polymethyl methacrylate, polybutene, polybutadiene, and polymethylpentene. , Ethylene vinyl acetate copolymer, ethylene (meth) acrylic acid copolymer, ethylene (meth) acrylic acid ester copolymer, ABS resin, film made of resin such as ionomer resin, foam film, or laminated film thereof Can be used. A commercially available resin film may be used, or a resin film formed by a cast film forming method using process materials may be used.

  Among the above, a film made of polyvinyl chloride is preferable from the viewpoint of excellent curved surface followability. Moreover, when forming the decoration layer mentioned later by printing, the film which consists of polyvinyl chloride is preferable also from the point which is excellent in the fixability of an ink.

  When the base material 11 consists of a resin film, the base material 11 may be opaque or transparent, but generally the through-hole 2 is less noticeable when the base material 11 is opaque.

  Moreover, in order to make the through-hole 2 inconspicuous, the surface roughness (Ra) of the surface of the substrate 11 is preferably 0.7 to 15 μm, and particularly preferably 0.7 to 10 μm.

  Or in order to make the through-hole 2 inconspicuous, it is preferable to provide a decoration layer in advance in the base material 11 before providing the through-hole 2. When the base material 11 is opaque, the decoration layer needs to be provided on the surface side of the base material 11, but when the base material 11 is transparent, the decoration layer is provided on the surface side of the base material 11. Alternatively, it may be provided on the back side (adhesive layer 12 side) or on both sides thereof.

  The decorative layer is preferably one that displays a color-coded pattern of two or more colors, whereby the through hole 2 is less noticeable. The pattern may be a predetermined pattern (see the examples), a photograph, or a character.

  A decoration layer can be formed by methods, such as printing, printing, application | coating of a coating material, transfer from a transfer sheet, vapor deposition, sputtering, etc., for example. The substrate 11 may be provided with an undercoat layer such as an easy-adhesion coat for forming the decorative layer or a gloss adjustment coat, a hard coat, a contamination prevention coat, a surface roughness and a specular gloss. A top coat layer such as a degree adjusting coat may be formed. Moreover, these decoration layers, undercoat layers, or topcoat layers may be formed on the entire surface of the substrate 11 or may be partially formed.

  Although the thickness of the base material 11 is 1-500 micrometers normally, Preferably it is about 25-200 micrometers, but can be suitably changed according to the use of the adhesive sheet 1. FIG.

  The type of the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer 12 is not particularly limited as long as the through-hole 2 can be formed, and any of acrylic, polyester, polyurethane, rubber, silicone, etc. It may be. The pressure-sensitive adhesive may be any of an emulsion type, a solvent type, or a solventless type, and may be a crosslinked type or a non-crosslinked type.

  The thickness of the pressure-sensitive adhesive layer 12 is usually 1 to 300 μm, preferably about 10 to 50 μm, but can be appropriately changed depending on the application of the pressure-sensitive adhesive sheet 1.

  The material of the release material 13 is not particularly limited, for example, a film made of a resin such as polyethylene terephthalate, polypropylene, polyethylene, or a foamed film thereof, or paper such as glassine paper, coated paper, laminated paper, A silicone-based, fluorine-based, or long-chain alkyl group-containing carbamate or other release agent can be used.

  Among the materials described above, it is preferable to use a release paper 13 that has been subjected to a release treatment. As the release material 13, as shown in FIG. 2, a release substrate 131 made of paper, a polyolefin layer 132 laminated on the release substrate 131, a release agent layer 133 formed on the polyolefin layer 132, The thing provided with is preferable. The release agent mentioned above can also be used for this release agent layer 133.

  The polyolefin layer 132 is easy to disperse the irradiation energy of the laser beam. By providing the polyolefin layer 132, when laser processing is performed from the surface side of the pressure-sensitive adhesive sheet 1 (see FIG. 3 (d)), the laser beam It is possible to prevent light from penetrating only the base material 11 and the pressure-sensitive adhesive layer 12 and not penetrating the release material 13. Thereby, it is possible to prevent damage to the production line, specifically, the stage (the member that supports and conveys the adhesive sheet 1) due to laser light irradiation.

  Examples of the polyolefin constituting the polyolefin layer 132 include polyethylene and polypropylene, and among these, polyethylene is preferable.

  The thickness of the release material 13 is usually about 10 to 250 μm, preferably about 50 to 200 μm. The thickness of the release substrate 131 is preferably about 5 to 220 μm, the thickness of the polyolefin layer 132 is preferably about 10 to 30 μm, and the thickness of the release agent layer 133 is usually 0.05. -5 μm, preferably 0.1-3 μm.

  In addition, although the through-hole 2 in the adhesive sheet 1 which concerns on this embodiment penetrates only the base material 11 and the adhesive layer 12, it may also penetrate the peeling material 13. FIG.

  Moreover, although the adhesive sheet 1 which concerns on this embodiment is provided with the peeling material 13, this invention is not limited to this, The peeling material 13 may not be. Furthermore, the magnitude | size, shape, etc. of the adhesive sheet 1 which concern on this embodiment are not specifically limited. For example, the pressure-sensitive adhesive sheet 1 may be a tape-shaped material (adhesive tape) composed of only the base material 11 and the pressure-sensitive adhesive layer 12 and may be wound into a roll shape to be a wound body.

[Manufacture of adhesive sheet]
An example of the manufacturing method of the adhesive sheet 1 according to the above embodiment will be described with reference to FIGS.

  In this manufacturing method, as shown in FIGS. 3A to 3B, the pressure-sensitive adhesive layer 12 is first formed on the release treatment surface of the release material 13. In order to form the pressure-sensitive adhesive layer 12, a pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer 12 and, if desired, a coating agent further containing a solvent are prepared, and a roll coater, a knife coater, a roll knife coater, an air knife coater, and a die coater. What is necessary is just to apply | coat and dry to the peeling process surface of the peeling material 13 with coating machines, such as a bar coater, a gravure coater, and a curtain coater.

  Next, as shown in FIG.3 (c), the base material 11 is crimped | bonded to the surface of the adhesive layer 12, and it is set as the laminated body which consists of the base material 11, the adhesive layer 12, and the peeling material 13. FIG.

And as shown in FIG.3 (d), the through-hole 2 which penetrates at least the base material 11 and the adhesive layer 12 is formed. The formation of the through hole 2 is preferably performed by laser processing, and it is particularly preferable to irradiate the laser beam from the substrate surface 1A side. Since the through hole 2 formed by laser processing usually has a tapered taper, by performing laser processing from the substrate surface 1A side as described above, the hole diameter (d ₂ ) in the adhesive surface 1B of the adhesive layer 12 is obtained. is smaller than the diameter of the through-holes 2 in the substrate surface 1A _{(d 1),} the through-holes 2 in the pressure-sensitive adhesive surface 1B for the diameter of the through-holes 2 in the substrate surface 1A _{(d 2)} pore size _{(d 1)} It becomes easy to control the ratio (d ₂ / d ₁ ) within the aforementioned range (1.2 to 4.0).

  When laser processing is performed as described above, it is preferable that the laser beam (through hole 2) penetrates the base material 11 and the pressure-sensitive adhesive layer 12, but does not penetrate the release material 13. Thereby, damage to the production line due to laser beam irradiation can be prevented.

The type of laser used for laser processing is not particularly limited. For example, carbon dioxide (CO ₂ ) laser, TEA-CO ₂ laser, YAG laser, UV-YAG laser, excimer laser, semiconductor laser, YVO ₄ laser A YLF laser or the like can be used.

  In addition, when laser processing is performed as described above, by attaching a protective film to the surface of the base material 11, it is possible to prevent a melt that can be generated by laser processing from adhering to the surface of the base material 11. As a protective film, the well-known protective film used for a building material or a metal plate can be used. Moreover, when using what was manufactured with the cast film forming method as the base material 11, even if it laser-processes in the state which laminated | stacked the carrier sheet for cast film formation on the surface of the base material 11, the same effect is obtained. can get.

  In the above manufacturing method, the pressure-sensitive adhesive layer 12 is applied and formed on the release material 13, and the formed pressure-sensitive adhesive layer 12 and the base material 11 are bonded together. However, the present invention is not limited to this. The pressure-sensitive adhesive layer 12 may be formed directly on the substrate 11 by coating.

[Use of adhesive sheet]
For example, when the pressure-sensitive adhesive sheet 1 is attached to an adherend such as a window, first, the release material 13 is first peeled from the pressure-sensitive adhesive layer 12 and the exposed pressure-sensitive adhesive surface 1B of the pressure-sensitive adhesive layer 12 and / or the surface of the adherend. Add water. Water can be applied by spraying or the like, but the amount of water need not be drooping. Further, the amount of water remaining after wiping the adherend with a cloth containing water is sufficient. According to the pressure-sensitive adhesive sheet 1 according to the present embodiment, it is possible to prevent wrinkles from entering the pressure-sensitive adhesive sheet 1 by using a small amount of water as described above, and to the adherend, the pressure-sensitive adhesive sheet 1. Can be easily aligned.

  Next, when the pressure-sensitive adhesive surface 1B of the pressure-sensitive adhesive layer 12 is affixed to the adherend and the position of the pressure-sensitive adhesive sheet 1 can be aligned with the adherend, the pressure-sensitive adhesive sheet 1 is attached by hand bonding or squeegee. Crimp to. At this time, the air between the adherend and the pressure-sensitive adhesive surface 1B of the pressure-sensitive adhesive layer 12 escapes from the through-hole 2 formed in the pressure-sensitive adhesive sheet 1 to the outside of the substrate surface 1A. It is possible to prevent air from forming between the two. Even if an air pool is formed, the air can be removed from the through-hole 2 to the outside of the substrate surface 1A by re-compression of the air pool or the peripheral area of the air pool including the air pool. Disappears. Such removal of air pockets is possible even after a long time has elapsed since the adhesive sheet 1 was applied.

  In addition, when the pressure-sensitive adhesive sheet 1 is pressure-bonded to the adherend as described above, the water attached to the pressure-sensitive adhesive surface 1B and / or the adherend is removed from the through-hole 2 and water remains in the through-hole 2. The pressure-sensitive adhesive force is reduced, and the pressure-sensitive adhesive sheet 1 is prevented from floating and peeling off. In addition, the through-hole 2 in the pressure-sensitive adhesive sheet 1 according to the present embodiment is not conspicuous on the substrate surface 1A, and thus the pressure-sensitive adhesive sheet 1 is excellent in appearance.

  EXAMPLES Hereinafter, although an Example etc. demonstrate this invention further more concretely, the scope of the present invention is not limited to these Examples etc.

[Example 1]
Acrylic solvent type on the release surface of a release material (Lintec Corp., KP-64 white, thickness: 80 μm) obtained by laminating one side of high-quality paper with polyethylene resin and then releasing the laminate surface with a silicone release agent A coating agent of an adhesive (manufactured by Lintec Corporation, PA-10) was applied by a knife coater so that the thickness after drying was 26 μm, and dried at 90 ° C. for 1 minute. A transparent base material (made by Okamoto, thickness: 100 μm) made of a polyvinyl chloride resin having a surface roughness (Ra) of 0.19 μm is pressure-bonded to the pressure-sensitive adhesive layer thus formed, and has a three-layer structure. A laminate was obtained.

  The surface roughness (Ra) was measured according to JIS B0601, using a cut-off value λc = 0.8 mm and an evaluation length ln = 10 mm, and using a Mitutoyo SV-3000S4 as a measuring device (hereinafter referred to as “measurement device”). the same).

Next, the laminate was irradiated with CO ₂ laser light from the substrate surface side to form through holes in an arrangement as shown in FIG. 4, and this was used as an adhesive sheet. Specifically, in plan view, units arranged in a straight line with 26 holes are formed in a zigzag shape in the width direction of the pressure-sensitive adhesive sheet, and the units are grouped together in the length direction of the pressure-sensitive adhesive sheet. It formed repeatedly so that it might not overlap. The length of the units arranged in a straight line was 50 mm, the distance between holes in the unit was 2 mm, and the distance between holes at the end in the length direction of the group (distance in the width direction of the adhesive sheet) was 3 mm and 10 mm. Moreover, the inclination | tilt angle (theta) with respect to the adhesive sheet length direction of the unit located in a line was 7 degrees.

The hole diameter (d ₂ ) on the substrate surface of the formed through hole was about 50 μm, the hole diameter (d ₁ ) on the adhesive surface was about 30 μm, and the ratio of the hole diameters (d ₂ / d ₁ ) was 1.7. The hole diameter of the through hole was measured using a scanning electron microscope (Hitachi, Ltd., S-2360N type) (hereinafter the same). In addition, although the base material and the adhesive layer penetrated the through-hole, the release material did not penetrate.

Here, the presence or absence of printing on the used substrate or the kind of pattern, surface roughness (Ra), pore diameter (d ₁ , d ₂ ) on the adhesive surface of the through hole and the substrate surface, and the ratio of the pore diameter (d ₂ / D ₁ ) is shown in Table 1.

[Examples 2 to 10, Comparative Examples 1 to 5]
Table 1 in the printing and surface roughness along with using a substrate having a (Ra), a pore diameter in the adhesive surface and the substrate surface of the through-hole _{(d 1,} d _2), and pore size of the ratio (d 2 _/ d ₁ ) Was produced in the same manner as in Example 1 except that through holes were formed so as to have the values shown in Table 1.

  Here, in Examples 2 and 4 to 10 and Comparative Examples 1 to 5, in order to increase the surface roughness (Ra), the surface (the surface not in contact with the pressure-sensitive adhesive layer) is subjected to mat processing by embossing. The substrate used was used. Moreover, in Examples 3-10 and Comparative Examples 1-5, the base material by which the pattern A to F was further printed on the back surface (surface which contact | connects an adhesive layer) by screen printing was used.

  The pattern patterns A to F are shown in FIG. A is a soap bubble-like pattern. B is a pattern of petals, butterflies and ladybugs. C is a pattern of a plant in which florets bloom. D is a Hawaiian-like plant pattern. E is a stained glass pattern. F is a pattern in which a plurality of irregular circles are displayed. Each pattern is color-coded by three or more colors.

[Test example]
(1) Water / air release test The water / air release test was performed as follows on the pressure-sensitive adhesive sheets obtained in Examples and Comparative Examples. The results are shown in Table 2.

  As the adherend, a 70 mm × 70 mm glass plate having a partially spherical recess (concave portion) having a maximum depth of 1 mm was prepared. The release material was peeled from the pressure-sensitive adhesive sheet (size: 50 mm × 50 mm), and a small amount of water was adhered to the exposed pressure-sensitive adhesive surface and the surface of the melamine-coated plate by spraying.

  Then, stick the adhesive surface of the adhesive sheet to the surface of the melamine coating plate (there is an air pocket between the dent and the adhesive sheet), and press the adhesive sheet by hand to see if water and air can escape. It was confirmed. As a result, the case where water and air did not remain is represented by ○, and the case where water or air remained was represented by ×.

(2) Appearance inspection The appearance inspection was performed as follows about the adhesive sheet obtained by the Example and the comparative example. The results are shown in Table 2.

  The pressure-sensitive adhesive sheet (size: 30 mm × 30 mm) from which the release material had been peeled was attached to a melamine-coated plate, and the appearance of the pressure-sensitive adhesive sheet surface was examined with the naked eye under an indoor fluorescent lamp. The distance from the eyes to the adhesive sheet was about 30 cm, and the angle at which the adhesive sheet was viewed was variously changed. As a result, the case where the through-hole could not be recognized is indicated by ◎, the case where the through-hole was recognized only at a part of the angles was indicated by ○, and the case where the through-hole was recognized as a whole was indicated by ×.

  As can be seen from Table 1 and Table 2, the pressure-sensitive adhesive sheets (Examples 1 to 10) formed with through holes that meet the conditions of the present invention are excellent in water drainage and air escape properties, and the through holes are difficult to see. It had a good appearance. In Comparative Example 5, it was seen that water remained in the through hole.

  The pressure-sensitive adhesive sheet of the present invention is suitable as a pressure-sensitive adhesive sheet having a large size, such as a decorative film, a marking film, and a glass scattering prevention film to be attached to an adherend such as a window.

DESCRIPTION OF SYMBOLS 1 ... Adhesive sheet 11 ... Base material 12 ... Adhesive layer 13 ... Release material 131 ... Release base material 132 ... Polyolefin layer 133 ... Release agent layer 1A ... Base material surface 1B ... Adhesive surface 2 ... Through-hole

Claims (9)

A pressure-sensitive adhesive sheet comprising a base material and a pressure-sensitive adhesive layer, wherein a plurality of through-holes penetrating from one surface to the other surface are formed, and is attached using water at the time of application,
The hole diameter of the through hole on the surface of the substrate is 20 to 80 μm,
The hole diameter of the through hole in the pressure-sensitive adhesive surface of the pressure-sensitive adhesive layer is 10 to 60 μm,
The pressure-sensitive adhesive sheet, wherein a ratio of a hole diameter of the through-hole in the pressure-sensitive adhesive surface of the pressure-sensitive adhesive layer to a hole diameter of the through-hole in the surface of the substrate is 1.2 to 4.0.   The pressure-sensitive adhesive sheet according to claim 1, wherein a distance between the center of one through hole and the center of another through hole adjacent to the one through hole is 1 to 15 mm.   The pressure-sensitive adhesive sheet according to claim 1 or 2, wherein the surface roughness (Ra) of the surface of the substrate is 0.7 to 15 µm.   The pressure-sensitive adhesive sheet according to claim 1, wherein a decorative layer is provided on the base material.   The pressure-sensitive adhesive sheet according to claim 4, wherein the decorative layer displays a color-coded pattern of two or more colors.   The pressure-sensitive adhesive sheet according to any one of claims 1 to 5, wherein a release material that does not penetrate the through hole is laminated on the pressure-sensitive adhesive surface of the pressure-sensitive adhesive layer.   The pressure-sensitive adhesive sheet according to claim 6, wherein the release material includes a release base material made of paper and a polyolefin layer provided on the release base material.   The pressure-sensitive adhesive sheet according to claim 1, wherein the through hole is formed by laser processing. It is a manufacturing method of the adhesive sheet according to any one of claims 1 to 8,
The method for producing a pressure-sensitive adhesive sheet, wherein the through hole is formed by performing laser processing from the surface side of the substrate.

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