JP2005075953A - Pressure-sensitive adhesive sheet and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pressure-sensitive adhesive sheet which secures sufficient adhesive force without adversely affecting the external appearance of the pressure-sensitive adhesive sheet and can prevent or remove trapped air or a blister, and a method for manufacturing such a pressure-sensitive adhesive. <P>SOLUTION: In the laminated sheet obtained by laminating a decorative layer 14, a base material 11, a pressure-sensitive adhesive layer 12, and a releasing material 13, a plurality of penetrating holes 2 which penetrate from one side of the laminated sheet to the other side are formed. The hole diameter of the penetrating holes 2 is set to 0.1-300 μm and a hole density is set to 30-50,000/100 cm<SP>2</SP>. Such penetrating holes 2 are preferably formed by laser processing. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an adhesive sheet capable of preventing or removing air pockets and blisters, and a method for producing such an adhesive sheet.

  When the pressure-sensitive adhesive sheet is manually attached to the adherend, air can be trapped between the adherend and the pressure-sensitive adhesive surface, which may impair the appearance of the pressure-sensitive adhesive sheet. Such air pockets are likely to occur particularly when the area of the adhesive sheet is large.

  In order to eliminate defects in the appearance of the pressure-sensitive adhesive sheet due to air accumulation, it is possible to replace the pressure-sensitive adhesive sheet with another pressure-sensitive adhesive sheet, peel off the pressure-sensitive adhesive sheet, and re-stick it, or make a hole in the swollen part of the pressure-sensitive adhesive sheet with a sewing needle. Opening and drawing air is done. However, when the adhesive sheet is replaced, not only labor is required, but also the cost increases, and when the adhesive sheet is reapplied, the adhesive sheet is torn, the surface is wrinkled, the adhesive In many cases, problems such as a decrease in performance occur. On the other hand, the method of making a hole with a sewing needle impairs the appearance of the adhesive sheet.

  In order to prevent the accumulation of air, there is a method of applying water after applying water to the adherend or adhesive surface in advance, but adhesive sheets with large dimensions such as glass scattering prevention films, decorative films, marking films, etc. to be attached to windows It takes a lot of time and effort to put on. Also. Although there is a method for preventing the occurrence of air pockets by sticking using a machine instead of manual work, mechanical sticking may not be applied depending on the use of the adhesive sheet or the site / shape of the adherend.

  On the other hand, resin materials such as acrylic resin, ABS resin, polystyrene resin, and polycarbonate resin may generate gas when heated or not heated. When an adhesive sheet is affixed, blisters (bulges) are generated in the adhesive sheet by the gas generated from the adherend.

In order to solve the above problems, Patent Document 1 and Patent Document 2 propose an adhesive sheet in which a large number of independent small convex portions are arranged in the form of dots on the adhesive surface of the adhesive layer. In this pressure-sensitive adhesive sheet, the tip of the small convex portion of the pressure-sensitive adhesive layer is in close contact with the adherend, and the basic flat surface of the pressure-sensitive adhesive layer is held in a state of being separated from the adherend. Since a gap communicating with the outside is formed between the substrate and the adherend, air or gas from the pressure-sensitive adhesive sheet is prevented by removing air or gas from the gap.
Noto 2503717 Noto 2587198 gazette

  However, in the pressure-sensitive adhesive sheets disclosed in Patent Document 1 and Patent Document 2, only the tip of the small convex portion of the pressure-sensitive adhesive layer adheres to the adherend, so that the adhesive force is weak, and the pressure-sensitive adhesive layer and the adherend There is a problem that water, chemicals and the like easily enter between the adhesive and the adhesive force. Even when such an adhesive sheet is strongly pressed against the adherend, the adhesive force is not sufficient due to the influence of the small convex portions of the adhesive layer. In that case, since a gap communicating with the outside is filled, blisters generated when gas is generated from the adherend cannot be prevented. Furthermore, in the said adhesive sheet, there also existed a problem that the shape (small convex part) of an adhesive layer affected the surface of an adhesive sheet and impaired the external appearance of an adhesive sheet.

  The present invention has been made in view of such circumstances, and can prevent or remove air pockets and blisters while maintaining a sufficient adhesive force without impairing the appearance of the pressure-sensitive adhesive sheet. And it aims at providing the manufacturing method of such an adhesive sheet.

In order to achieve the above object, first, the present invention includes a base material, a decorative layer provided on one side of the base material, and an adhesive layer provided on the other side of the base material. A pressure-sensitive adhesive sheet in which a plurality of through-holes penetrating from one surface to the other surface are formed, and the hole diameter of the through-hole in the base material, the decoration layer, and the pressure-sensitive adhesive layer is 0.1 to 300 μm. The pressure-sensitive adhesive sheet has a pore density of 30 to 50,000 / 100 cm ² (Claim 1).

  In this specification, “sheet” includes the concept of film, and “film” includes the concept of sheet. Here, the decoration layer is a layer formed on the entire surface of the substrate surface or the surface of another layer provided on the substrate or a predetermined area, and does not necessarily have to be a layer intended for decoration.

  In the pressure-sensitive adhesive sheet according to the invention (invention 1), the through hole is not blocked by the decorative layer, and the air between the adherend and the pressure-sensitive adhesive surface escapes from the through-hole to the outside of the pressure-sensitive adhesive sheet surface. When sticking to an adherend, it is difficult to entrain air and it is possible to prevent air from being trapped. Even if air is entrained by air entrainment, by recompressing the air reservoir portion or the peripheral portion of the air reservoir portion including the air reservoir portion, air escapes from the through hole to the outside of the adhesive sheet surface, The air pocket disappears. Even if gas is generated from the adherend after being attached to the adherend, the gas escapes from the through hole to the outside of the surface of the pressure-sensitive adhesive sheet, so that blisters can be prevented from occurring.

In addition, since the hole diameter of a through-hole is 300 micrometers or less, it does not stand out on the adhesive sheet surface, and does not impair the external appearance of an adhesive sheet. Moreover, since the hole density of a through-hole is 50,000 piece / 100cm < ² > or less, the mechanical strength of an adhesive sheet is maintained.

  In the said invention (invention 1), the hole diameter of the said through-hole may become small gradually from the adhesive sheet back surface to the adhesive sheet surface (invention 2). Thus, when the hole diameter of a through-hole changes, a through-hole becomes inconspicuous on the surface of an adhesive sheet, and the external appearance of an adhesive sheet can be kept favorable.

  In the above inventions (Inventions 1 and 2), the through hole is preferably formed by laser processing (Invention 3). According to laser processing, it is possible to easily form fine through-holes with good air release properties at a desired hole density. However, the method for forming the through hole is not limited to this. For example, the through hole may be formed by a water jet, a micro drill, a precision press, a hot needle, or the like.

2ndly this invention manufactures the lamination sheet formed by laminating | stacking a decoration layer, a base material, an adhesive layer, and a peeling material depending on necessity, The said decoration layer, a base material, and an adhesive are laminated | stacked on the said lamination sheet. A method for producing a pressure-sensitive adhesive sheet is provided, wherein through-holes having a hole diameter of 0.1 to 300 μm in the layer are formed at a hole density of 30 to 50,000 / 100 cm ² (Claim 4). In addition, the said laminated sheet may contain layers other than a decoration layer, a base material, an adhesive layer, and a peeling material.

  If a decorative layer is formed after forming a through hole in a laminated sheet that does not include a decorative layer, the decorative layer may block the through hole and impair the air release property, and the fixing property of the decorative layer near the through hole The problem that becomes unstable. However, in the above invention (invention 4), since the through hole is formed after the laminated sheet including the decorative layer is manufactured, there is no possibility that the decorative layer blocks the through hole, and in the vicinity of the through hole. The fixing property of the decorative layer is sufficiently secured.

  That is, according to the said invention (invention 4), the air between a to-be-adhered body and an adhesion surface and the gas generated from a to-be-adhered body are extracted from a through-hole, and an air pocket and a blister are prevented or removed. In addition, the pressure-sensitive adhesive sheet in which the decorative layer has a stable fixability can be easily produced.

  In the said invention (invention 4), it is preferable to form the said through-hole by laser processing (invention 5), and in that case, it is preferable to perform laser processing from the adhesive sheet back surface side (invention 6). Here, the “back surface of the pressure-sensitive adhesive sheet” refers to the surface opposite to the surface of the pressure-sensitive adhesive sheet. When the release material is present in the lowermost layer, the lower surface of the release material, the pressure-sensitive adhesive layer is not present. When it is exposed, the adhesive surface of the adhesive layer is applicable.

  When forming a through hole by laser processing, the through hole is often tapered, so by applying laser processing from the back side of the adhesive sheet, the hole diameter of the through hole is closer to the front side of the adhesive sheet than the back side of the adhesive sheet. Therefore, the through-holes are less noticeable on the surface of the pressure-sensitive adhesive sheet, and the appearance of the pressure-sensitive adhesive sheet can be kept good.

  ADVANTAGE OF THE INVENTION According to this invention, the adhesive sheet which can prevent or remove an air pocket and a blister is obtained, without impairing the external appearance of an adhesive sheet and ensuring sufficient adhesive force.

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 decorative layer 14, 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 decorative layer 14, the base material 11, the pressure-sensitive adhesive layer 12 and the release material 13 and extending from the pressure-sensitive adhesive sheet surface 1 </ b> A to the pressure-sensitive adhesive sheet back surface 1 </ b> B are formed. When the pressure-sensitive adhesive sheet 1 is used, air generated between the adherend and the pressure-sensitive adhesive surface of the pressure-sensitive adhesive layer 12 and gas generated from the adherend escape from the through-hole 2 to the outside of the pressure-sensitive adhesive sheet surface 1A. In this way, air pockets and blisters can be prevented or removed.

  Although the cross-sectional shape of the through hole 2 is not particularly limited, the hole diameter of the through hole 2 in the decorative layer 14, the base material 11, and the pressure-sensitive adhesive layer 12 is 0.1 to 300 μm, preferably 0.5. 150 μm. When the hole diameter of the through hole 2 is less than 0.1 μm, it is difficult for air or gas to escape, and when the hole diameter of the through hole 2 exceeds 300 μm, the through hole 2 becomes conspicuous and the appearance of the pressure-sensitive adhesive sheet 1 is impaired.

  The hole diameter of the through-hole 2 may be constant in the thickness direction of the pressure-sensitive adhesive sheet 1 or may vary in the thickness direction of the pressure-sensitive adhesive sheet 1, but the hole diameter of the through-hole 2 is the thickness of the pressure-sensitive adhesive sheet 1. When changing in the vertical direction, as shown in FIG. 2, it is preferable that the diameter of the through hole 2 gradually decreases from the pressure-sensitive adhesive sheet back surface 1B to the pressure-sensitive adhesive sheet surface 1A. Thus, when the hole diameter of the through-hole 2 changes, the through-hole 2 becomes less conspicuous on the pressure-sensitive adhesive sheet surface 1A, and the appearance of the pressure-sensitive adhesive sheet 1 can be kept good. However, even in this case, the hole diameters of the decorative layer 14, the base material 11, and the pressure-sensitive adhesive layer 12 of the through-hole 2 need to be within the above range (0.1 to 300 μm).

The hole density of the through holes 2 is 30 to 50,000 / 100 cm ² , and preferably 100 to 10,000 / 100 cm ² . If the hole density of the through holes 2 is less than 30/100 cm ² , air or gas is difficult to escape, and if the hole density of the through holes 2 exceeds 50,000 / 100 cm ² , the mechanical strength of the pressure-sensitive adhesive sheet 1 is increased. descend.

  The through hole 2 is preferably formed by laser processing described later. According to laser processing, it is possible to easily form fine through-holes with good air release properties at a desired hole density. However, the formation method of the through-hole 2 is not limited to this, For example, you may form with a water jet, a micro drill, a precision press, a hot needle, etc.

  The material of the substrate 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, paper, and the like And the like.

  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 casting method or the like using process materials may be used. Further, as the paper, for example, high-quality paper, glassine paper, coated paper, laminated paper and the like can be used.

  The thickness of the substrate 11 is usually 1 to 500 μm, preferably about 3 to 300 μm, but can be appropriately changed depending on the application of the pressure-sensitive adhesive sheet 1.

  The type of the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer 12 is not particularly limited as long as it is a material that can form the through-hole 2 as described above. Acrylic, polyester-based, polyurethane-based, rubber-based, silicone Any of a system etc. may be sufficient. Further, the pressure-sensitive adhesive may be any of an emulsion type, a solvent type, or a solventless type, and may be either 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 5 to 100 μm, but can be appropriately changed according to the application of the pressure-sensitive adhesive sheet 1.

  The material of the release material 13 is not particularly limited as long as it can form the through-hole 2 as described above. For example, a film made of a resin such as polyethylene terephthalate, polypropylene, polyethylene or the foamed film thereof. Alternatively, papers such as glassine paper, coated paper, and laminated paper that have been subjected to a release treatment with a release agent such as a silicone-based, fluorine-based, or long-chain alkyl group-containing carbamate can be used.

  The thickness of the release material 13 is usually about 10 to 250 μm, preferably about 20 to 200 μm. Further, the thickness of the release agent in the release material 13 is usually 0.05 to 5 μm, preferably 0.1 to 3 μm.

  The decoration layer 14 is a layer formed by a method such as printing, printing, application of a paint, transfer from a transfer sheet, vapor deposition, or sputtering, and is not necessarily limited to a layer intended for decoration. Moreover, when the surface of the base material 11 is colored or has a design, a pattern, or the like, the surface layer of the base material 11 corresponds to the decoration layer 14.

  The material constituting the decoration layer 14 is not particularly limited as long as the through-hole 2 can be formed by laser processing, and materials generally used in the formation method can be used.

  Although the thickness of the decoration layer 14 is 0.01-100 micrometers normally, Preferably it is about 0.1-60 micrometers, but can be suitably changed according to the use of the adhesive sheet 1. FIG.

  In addition, the decoration layer 14 does not necessarily need to be formed in the whole surface of the adhesive sheet 1 (base material 11), and may be formed only in the predetermined area of the adhesive sheet 1 (base material 11). The decoration layer 14 may be a single layer made of a single material, or may be composed of a plurality of layers.

  Furthermore, you may provide the application tape which peels after sticking the adhesive sheet 1 to a to-be-adhered body on the surface of the decoration layer 14, and the laminate film which does not peel. By providing these application tapes and laminate films, the decorative layer 14 can be protected. Further, by providing an application tape, the pressure-sensitive adhesive sheet 1 can be stiffened to improve the sticking suitability of the pressure-sensitive adhesive sheet 1, and the appearance of the pressure-sensitive adhesive sheet 1 due to scratches that may occur when sticking using a jig. Defects can also be reduced.

  When the application tape or the laminate film is provided as described above, when the through hole 2 is formed in the pressure-sensitive adhesive sheet 1, it is preferable to form the through hole 2 so as to also penetrate the application tape or the laminate film. .

  In the pressure-sensitive adhesive sheet 1 according to this embodiment, the through-hole 2 penetrates the release material 13, but the present invention is not limited to this, and the through-hole 2 includes the decorative layer 14, the base material 11, and the pressure-sensitive adhesive. Only the layer 12 may be penetrated. In this case, the material of the peeling material 13 does not need to be a material that can form the through hole 2. 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.

  In addition, the magnitude | size, shape, etc. of the adhesive sheet 1 which concern on this embodiment are not specifically limited.

[Manufacture of adhesive sheet (1)]
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 the decoration layer 14 is formed in the surface of the base material 11, as shown in FIG.3 (d).

  The method of forming the decoration layer 14 differs depending on the type of the decoration layer 14. For example, when the decoration layer 14 is configured by an ink layer (printing layer), relief printing such as flexographic printing, intaglio printing such as gravure printing, offset, etc. The decorative layer 14 can be formed by a printing method such as flat printing such as printing or screen printing such as silk screen. When the decorative layer 14 is composed of a paint layer, for example, a roll coater, knife coater, roll knife coater, air knife coater, die coater, bar coater, gravure coater, curtain coater, spray coater, spray gun, etc. The decorative layer 14 can be formed by a machine tool. Furthermore, when the decoration layer 14 is configured by transfer from a transfer sheet, pressure is applied to the transfer sheet laminated on the surface of the substrate 11 or the surface of the substrate 11 is applied depending on the type of transfer sheet. The decorative layer 14 can be formed by heating the laminated transfer sheet. Furthermore, when the decoration layer 14 is formed of a metal thin film, the decoration layer 14 can be formed by vapor deposition, sputtering, or the like.

  The decoration layer 14 is not necessarily formed on the entire surface of the base material 11, and may be formed only on a predetermined area on the surface of the adhesive base material 11. When application tapes or laminate films are provided on the surface of the decoration layer 14, the application tapes or laminate films are laminated on the surface of the decoration layer 14 at this stage in order to form the through holes 2 in these. .

  Finally, as shown in FIG. 3E, the through hole 2 is formed in the obtained laminate. The formation of the through hole 2 is preferably performed by laser processing, and the laser processing is preferably performed from the pressure-sensitive adhesive sheet back surface 1B side. When the through hole 2 is formed by laser processing, as shown in FIG. 2, since the through hole 2 is often tapered, by applying laser processing from the adhesive sheet back surface 1B side, the hole diameter of the through hole 2 is The decorative layer 14 side becomes smaller than the release material 13 side. Therefore, the through-hole 2 becomes less conspicuous on the surface of the pressure-sensitive adhesive sheet 1, and the appearance of the pressure-sensitive adhesive sheet 1 can be kept good.

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 the decoration layer 14 is formed only in a predetermined area, the through hole 2 may be formed on the entire surface of the laminated body, or may be formed only on the predetermined area. When the through-hole 2 is formed only in a predetermined area, a portion of the predetermined area is cut from the adhesive sheet 1 and used.

  Here, if the through-hole 2 is formed before the decoration layer 14 is formed on the base material 11 and then the decoration layer 14 is formed, the decoration layer 14 blocks the through-hole 2 and inhibits air release. And the problem that the fixing property of the decorative layer 14 becomes unstable in the vicinity of the through hole 2 occurs. However, in this manufacturing method, since the through hole 2 is formed after the decoration layer 14 is formed, there is no possibility that the decoration layer 14 blocks the through hole 2. That is, the through-hole 2 penetrates from the pressure-sensitive adhesive sheet surface 1 </ b> A to the pressure-sensitive adhesive sheet back surface 1 </ b> B including the decorative layer 14, and the air release property is not hindered by the presence of the decorative layer 14. Further, the fixing property of the decorative layer 14 in the vicinity of the through hole 2 is sufficiently secured.

[Manufacture of adhesive sheet (2)]
Another example of the method for producing the pressure-sensitive adhesive sheet 1 according to the above embodiment will be described with reference to FIGS.

  In this production method, as shown in FIGS. 4A to 4B, the release treatment surface of the release material 13 is applied in the same manner as the pressure-sensitive adhesive layer forming method in the pressure-sensitive adhesive sheet production method (1) described above. The pressure-sensitive adhesive layer 12 is formed.

  On the other hand, as shown in FIG. 4C, a decoration layer 14 is formed on the surface of the substrate 11 in advance. The formation method of the decoration layer 14 is as having illustrated by the said adhesive sheet manufacturing method (1).

  Next, as shown in FIGS. 4C to 4D, the decorative layer 14 and the base are formed so that the base material 11 on which the decorative layer 14 is formed and the adhesive layer 12 formed on the release material 13 are in close contact with each other. The laminate of the material 11 and the laminate of the pressure-sensitive adhesive layer 12 and the release material 13 are pressure-bonded to form a laminate composed of the decoration layer 14, the base material 11, the pressure-sensitive adhesive layer 12, and the release material 13. In addition, when providing an application tape and a laminate film on the surface of the decoration layer 14, in order to form the through-hole 2 also in these, an application tape or a laminate film is attached to the decoration layer 14 at an arbitrary stage until laser processing is performed. However, the layers are preferably laminated at this stage.

  And as shown in FIG.4 (e), the through-hole 2 is formed in the obtained laminated body. Similarly to the pressure-sensitive adhesive sheet manufacturing method (1), the formation of the through holes 2 is preferably performed by laser processing, and the laser processing is preferably performed from the pressure-sensitive adhesive sheet back surface 1B side.

  In the above production methods (1) and (2), the pressure-sensitive adhesive layer 12 is formed on the release material 13, and the formed pressure-sensitive adhesive layer 12 and the substrate 11 are bonded together. However, the present invention is limited to this. Instead, the pressure-sensitive adhesive layer 12 may be directly formed on the base material 11 and the formed pressure-sensitive adhesive layer 12 and the release material 13 may be bonded together.

[Use of adhesive sheet]
When the pressure-sensitive adhesive sheet 1 is attached to the adherend, the release material 13 is peeled off from the pressure-sensitive adhesive layer 12 so that the exposed pressure-sensitive adhesive surface of the pressure-sensitive adhesive layer 12 is brought into close contact with the adherend. Press against the adherend. At this time, air between the adherend and the pressure-sensitive adhesive surface 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 pressure-sensitive adhesive sheet surface 1A. It is difficult for air to be caught in between, and it is possible to prevent air from being trapped. Even if air is trapped due to air entrainment, the air can be re-bonded to the outside of the pressure-sensitive adhesive sheet surface 1A from the through-hole 2 by recompressing the air reservoir or the periphery of the air reservoir including the air reservoir. It escapes and the air pocket disappears. Such removal of air pockets is possible even after a long time has elapsed since the adhesive sheet 1 was applied.

  Further, even if gas is generated from the adherend after the adhesive sheet 1 is attached to the adherend, the gas escapes from the through-hole 2 formed in the adhesive sheet 1 to the outside of the adhesive sheet surface 1A. Blisters are prevented from occurring in the sheet 1.

  In the pressure-sensitive adhesive sheet 1, air pockets and blisters can be prevented or removed as described above. However, since the through holes 2 formed in the pressure-sensitive adhesive sheet 1 are very fine, the appearance of the pressure-sensitive adhesive sheet is impaired. In addition, even if the through-hole 2 is present, there is no possibility that the adhesive strength is reduced.

  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]
25 parts by weight of ethyl acetate is blended with 100 parts by weight of an acrylic adhesive (manufactured by Nippon Synthetic Chemical Industry Co., Ltd., Coponil N-2147, solid content: 35% by weight), and then an isocyanate crosslinking agent (manufactured by Nippon Polyurethane Industry Co., 1 part by weight of Coronate L) was mixed and stirred sufficiently to obtain a pressure-sensitive adhesive coating agent.

  After drying the pressure-sensitive adhesive coating agent on the release-treated surface of a release material (Lintec Corp., FPM-11, thickness: 175 μm), which is laminated with polyethylene on both sides of fine paper and coated with a silicone release agent on one side The film was coated with a knife coater so as to have a thickness of 30 μm, and dried at 90 ° C. for 1 minute.

  A base material (thickness: 100 μm) made of polyvinyl chloride was pressure-bonded to the pressure-sensitive adhesive layer thus formed. Then, 100 parts by weight of black ink (Seiko Advance, SG700 black) diluted with 20 parts by weight of solvent (Seiko Advance, T-912) is printed on the surface of the substrate by a screen printer, When dried at 60 ° C. for 5 minutes, a printed layer having a thickness of 10 μm was formed.

By irradiating the obtained laminate (printing layer + base material + adhesive layer + release material) with a UV-YAG laser from the release material side, the pore size on the surface of the print layer is 20 to 40 μm. Through-holes were formed at a hole density of 2500/100 cm ² , and this was used as an adhesive sheet.

[Example 2]
Printing was performed on the surface of a base material (thickness: 100 μm) made of polyvinyl chloride in the same manner as in Example 1. Moreover, it carried out similarly to Example 1, the adhesive layer was formed in the peeling process surface of a peeling material, and the base material which gave the said printing to the adhesive layer was crimped | bonded.

The release material is peeled from the resulting laminate (print layer + base material + adhesive layer + release material) having a four-layer structure, and the laminate is irradiated with a CO ₂ laser from the adhesive layer side to obtain a print layer surface. After forming through holes having a hole diameter of 20 to 40 μm at a hole density of 2500/100 cm ² , a release material was pressure-bonded to the pressure-sensitive adhesive layer again to obtain a pressure-sensitive adhesive sheet.

Example 3
After a four-layer laminate (printing layer + base material + adhesive layer + release material) was prepared in the same manner as in Example 1, application tape (manufactured by Lintec Corporation, Eltect AP1157) was used as a protective layer on the surface of the printing layer. ) Was affixed.

The release material was peeled off from the obtained laminate (protective layer + printing layer + base material + adhesive layer + release material) having a 5-layer structure, and the laminate was irradiated with a UV-YAG laser from the adhesive layer side. After forming through holes having a hole diameter of 30 to 50 μm on the surface of the printed layer at a hole density of 1,600 holes / 100 cm ² , a release material was pressure-bonded to the pressure-sensitive adhesive layer again to obtain a pressure-sensitive adhesive sheet.

[Comparative Example 1]
A four-layered laminate (printing layer + base material + adhesive layer + release material) was prepared in the same manner as in Example 1, and this was used as an adhesive sheet.

[Comparative Example 2]
Both surfaces of high-quality paper (110 g / m ² ) were laminated with low-density polyethylene so that the thickness of the laminate layer was 25 μm, and a silicone release agent was applied to one surface. Next, a metal embossing roll was pressure-bonded to the release treatment surface at 40 ° C. to form a recess on the release treatment surface, which was used as a release material.

  Using the obtained release material, a four-layered laminate (print layer + base material + adhesive layer + release material) was produced in the same manner as in Example 1, and this was used as an adhesive sheet. On the pressure-sensitive adhesive surface when the release material was peeled from this pressure-sensitive adhesive sheet, convex portions having a substantially square shape in plan view with a side length of 700 μm and a height of 18 μm were formed at intervals of 300 μm in length and width.

[Test example]
The pressure-sensitive adhesive sheets obtained in Examples 1 to 3 and Comparative Examples 1 and 2 were subjected to an air retention disappearance test and a strength test as follows, and the appearance of the pressure-sensitive adhesive sheet surface was visually determined.

  Air reservoir disappearance test: An adhesive sheet cut to 50 mm × 50 mm was attached to a melamine coating plate so as to form a circular air reservoir having a diameter of about 15 mm, and the adhesive sheet was pressure-bonded with a squeegee. As a result, the case where the air pocket disappeared is represented by ◯, and the case where the air pool remained is represented by x.

  Strength test: A pressure-sensitive adhesive sheet (tape) cut to a width of 10 mm and a length of 150 mm and peeled off the release material is attached to a tensile strength tester (Orientec, Tensilon) at a grip interval of 100 mm and pulled at 200 mm / min. Those that do not break within 10 seconds are indicated by ◯, and those that do not break are indicated by ×.

The results of each test are shown in Table 1.

  As is clear from Table 1, the pressure-sensitive adhesive sheets obtained in Examples 1 to 3 can easily remove air pockets, have sufficient strength, and have a good appearance.

  The pressure-sensitive adhesive sheet of the present invention and the pressure-sensitive adhesive sheet obtained by the production method of the present invention generally generate air from the adherend when the pressure-sensitive adhesive sheet is prone to air accumulation and blistering, for example, when the area of the pressure-sensitive adhesive sheet is large. It can be preferably used for such cases.

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 one Embodiment of this invention. It is sectional drawing which shows an example of the manufacturing method of the adhesive sheet which concerns on one Embodiment of this invention. It is sectional drawing which shows the other example of the manufacturing method of the adhesive sheet which concerns on one Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Adhesive sheet 11 ... Base material 12 ... Adhesive layer 13 ... Release material 14 ... Decoration layer 1A ... Adhesive sheet surface 1B ... Adhesive sheet back surface 2 ... Through-hole

Claims (6)

A through-hole comprising a base material, a decorative layer provided on one side of the base material, and an adhesive layer provided on the other side of the base material, penetrating from one surface to the other surface A plurality of pressure-sensitive adhesive sheets, wherein the through-holes have a hole diameter of 0.1 to 300 μm in the base material, decorative layer and pressure-sensitive adhesive layer, and a hole density of 30 to 50,000 / 100 cm ² . A pressure-sensitive adhesive sheet.   2. The pressure-sensitive adhesive sheet according to claim 1, wherein the diameter of the through hole gradually decreases from the pressure-sensitive adhesive sheet back surface to the pressure-sensitive adhesive sheet surface.   The pressure-sensitive adhesive sheet according to claim 1 or 2, wherein the through-hole is formed by laser processing. Producing a laminated sheet comprising a decorative layer, a substrate, a pressure-sensitive adhesive layer, and optionally a release material,
Through-holes having a pore diameter of 0.1 to 300 μm in the decorative layer, base material and pressure-sensitive adhesive layer are formed in the laminated sheet at a pore density of 30 to 50,000 / 100 cm ^2. Sheet manufacturing method.   The method for producing a pressure-sensitive adhesive sheet according to claim 4, wherein the through-hole is formed by laser processing. 6. The method for producing a pressure-sensitive adhesive sheet according to claim 5, wherein laser processing is performed from the back side of the laminated sheet.

Images