JP2011021094A - Self-adhesive sheet and method for producing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a self-adhesive sheet easily expelling air entangled between the self-adhesive sheet and an adherend surface, and preventing or eliminating air retention, as well as having excellent adhesiveness of the self-adhesive layer to a substrate and to the adherend, maintaining barrier property of the substrate and having excellent printability on the substrate surface, and to provide a method for producing the self-adhesive sheet. <P>SOLUTION: The self-adhesive sheet (1) includes a first self-adhesive layer (3) having a recessed groove (31) running to an end edge of the substrate (2), and a second self-adhesive layer (4) having a plurality of through-holes (41) penetrating from one face to the other face, layered in this order on at least one surface of the substrate (2). <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a pressure-sensitive adhesive sheet and a method for producing the same, and more particularly to a pressure-sensitive adhesive sheet used for protecting a surface of a decorative pressure-sensitive adhesive sheet, a marking film, a metal plate or the like, and a method for producing the same.

  Unlike a paint, a pressure-sensitive adhesive sheet made by applying a pressure-sensitive adhesive to one side of a resin sheet such as vinyl chloride is advantageous in that it does not use a solvent and does not require a drying process. Used for marking film. Generally, an adhesive sheet is comprised from the base material sheet and the adhesive layer formed in the surface, and the peeling sheet is provided in the adhesive layer surface as needed. In use, when a release sheet is provided, the release sheet is peeled off and stuck so that the pressure-sensitive adhesive layer is in contact with the adherend surface.

  However, when the adhesive sheet is attached manually, air is caught between the adhesive sheet and the surface of the adherend, and air pockets (bubbles) remain after the sheet is attached, and bulge to the surface side of the adhesive sheet. There is a problem of producing a part (so-called “blister”). Such air pockets are particularly likely to occur in the case of a pressure-sensitive adhesive sheet having a large sticking area, such as a decorative pressure-sensitive adhesive sheet, a marking film, or a surface-protective pressure-sensitive adhesive sheet.

  In order to remove the air pocket, the pressure-sensitive adhesive sheet is peeled off and pasted again, or a hole is made from the base sheet side with a needle to evacuate the pressure-sensitive adhesive sheet. However, the method of re-sticking the pressure-sensitive adhesive sheet often causes problems such as tearing of the pressure-sensitive adhesive sheet, wrinkles on the surface, and a decrease in the adhesive strength. It will damage the appearance.

  In order to prevent the formation of air pockets, there is a method in which the surface of an adherend such as glass is wetted in advance with an aqueous solution containing a surfactant, and an adhesive sheet is attached and dried. However, this method is cumbersome, especially when sticking a pressure-sensitive adhesive sheet over a wide area, it is very difficult to stick it while removing all the air that has been caught. Appropriate skill is required to apply.

Various pressure-sensitive adhesive sheets have been proposed in order to expel air trapped between the pressure-sensitive adhesive sheet and the adherend surface.
For example, Patent Document 1 discloses a pressure-sensitive adhesive sheet having a pressure-sensitive adhesive layer in which a large number of independent small convex portions are provided in a dotted pattern on a base sheet. This pressure-sensitive adhesive sheet can be easily peeled off and re-applied easily because only the tip of the small convex part sticks to another object. In addition, since a large air gap cross-sectional area is formed between the adhesive layer and the adherend, air entrained between the adhesive layer and the adherend can be easily expelled. However, since the adhesive sheet described in Patent Document 1 has a large gap between the adhesive layer and the adherend, adhesion between the adhesive sheet and the adherend is low.
Patent Document 2 discloses a pressure-sensitive adhesive layer in which an uneven portion is formed on at least one surface of a base material, and a non-breathable pressure-sensitive adhesive layer having flat surfaces on both surfaces is brought into contact with the convex portion of the base material. A sheet is disclosed. When the pressure-sensitive adhesive sheet is attached to the adherend and air is entrained between the pressure-sensitive adhesive layer and the adherend, the pressure-sensitive adhesive layer adheres to the concave inner wall of the substrate surface, A cavity is formed with the adherend, and air and gas are discharged from the cavity to the outside. However, the pressure-sensitive adhesive sheet described in Patent Document 2 tends to have low adhesion because the contact area between the base material and the pressure-sensitive adhesive layer is small, although air is easily removed when sticking.
Further, Patent Document 3 discloses a pressure-sensitive adhesive sheet in which concave grooves that open to the edge of the sheet are provided in the pressure-sensitive adhesive layer, and through-holes are provided in the base material sheet and the pressure-sensitive adhesive layer. When the pressure-sensitive adhesive sheet is stuck to an adherend and air is entrained between the pressure-sensitive adhesive layer and the adherend, air and gas are discharged to the outside through the through hole and the groove. The However, the pressure-sensitive adhesive sheet described in Patent Document 3 has poor printability on the surface of the base material because through holes are also formed in the base material, although air is easily removed when sticking.

Utility Model Registration No. 2503717 International Publication No. 2008/0775767 JP 2005-336249 A

  The present invention can easily expel air trapped between the pressure-sensitive adhesive sheet and the adherend surface, prevent or remove air accumulation, and adhere to the pressure-sensitive adhesive layer, the substrate and the adherend. An object of the present invention is to provide a pressure-sensitive adhesive sheet that has excellent properties, can maintain the barrier properties of a substrate, and is excellent in printability on the substrate surface, and a method for producing the same.

The above-mentioned subject is achieved by the following means.
[1] A second pressure-sensitive adhesive layer having a first pressure-sensitive adhesive layer having a groove groove communicating with an edge of the base material on at least one surface of the base material, and a plurality of through holes penetrating from one surface to the other surface. A pressure-sensitive adhesive sheet in which agent layers are laminated in this order.
[2] The pressure-sensitive adhesive sheet according to [1], wherein the groove groove of the first pressure-sensitive adhesive layer is formed on a surface opposite to the side in contact with the base material.
[3] The pressure-sensitive adhesive sheet according to [1] or [2], wherein the groove groove of the first pressure-sensitive adhesive layer communicates with the through hole of the second pressure-sensitive adhesive layer.
[4] The width of the groove is 30 to 300 μm, the depth of the groove is 5 to 35 μm, and the pitch between the grooves is 200 μm to 2 mm. ] The adhesive sheet in any one of.
[5] The pressure-sensitive adhesive sheet according to any one of [1] to [4], wherein the concave grooves are formed in a lattice shape.
[6] The pressure-sensitive adhesive sheet according to any one of [1] to [5], wherein a diameter of the through holes is 30 μm to 2 mm, and a pitch between the through holes is 100 μm to 12 mm.
[7] At least one surface of the base material has a first pressure-sensitive adhesive layer having a concave groove communicating to the edge of the base material, and a second pressure-sensitive adhesive having a plurality of through holes penetrating from one surface to the other surface. A method for producing a pressure-sensitive adhesive sheet in which agent layers are laminated in this order,
(A1) providing at least one surface of the base material with a first pressure-sensitive adhesive layer in which a concave groove communicating to the end is formed;
(A2) After applying a pressure-sensitive adhesive to the release surface of the release sheet and coating the pressure-sensitive adhesive layer, the adhesive layer is irradiated with a laser beam to form a through-hole, on the release sheet, A step of providing a second pressure-sensitive adhesive layer having a through hole; and (a3) a base material provided with a first pressure-sensitive adhesive layer in step (a1) and a release sheet provided with a second pressure-sensitive adhesive layer in step (a2) Including a step of bonding the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer in contact with each other.

  The pressure-sensitive adhesive sheet of the present invention is excellent in adhesiveness between the pressure-sensitive adhesive layer, the base material and the adherend, and easily expels air trapped between the pressure-sensitive adhesive sheet and the adherend surface to prevent or remove air accumulation. can do. Moreover, since the base material surface is flat, the barrier property of a base material can be hold | maintained and it is excellent in the printability to a base material surface. Moreover, according to this invention, such an adhesive sheet can be manufactured efficiently.

It is sectional drawing of one preferable embodiment of the adhesive sheet of this invention. It is sectional drawing which shows the one aspect | mode of the state at the time of sticking the adhesive sheet of FIG. 1 to a to-be-adhered body. It is sectional drawing which shows one aspect | mode of the state after sticking the adhesive sheet of FIG. 1 to a to-be-adhered body.

  Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the description of each drawing, the same elements are denoted by the same reference numerals.

  FIG. 1 is a cross-sectional view of a preferred embodiment of the pressure-sensitive adhesive sheet of the present invention. As shown in FIG. 1, the pressure-sensitive adhesive sheet 1 of the present invention is formed by laminating a first pressure-sensitive adhesive layer 3 and a second pressure-sensitive adhesive layer 4 in this order on at least one surface of a substrate 2. The 1st adhesive layer 3 has the groove 31 (31a, 31b, and 31c) connected to the edge part of the base material 2. FIG. The second pressure-sensitive adhesive layer 4 has a plurality of through holes 41 (41a and 41b) penetrating from one surface to the other surface. Moreover, the peeling sheet 5 is affixed on the surface of the 2nd adhesive layer 4 as needed.

  In the pressure-sensitive adhesive sheet of the present invention, the first pressure-sensitive adhesive layer 3 has a concave groove 31 that communicates with the edge of the substrate 2. By the action of the groove 31, the air trapped between the pressure-sensitive adhesive sheet and the adherend can be expelled, and air accumulation can be prevented or removed. In FIG. 1, three concave grooves 31a, 31b and 31c are shown, but the present invention is not limited to this.

From the viewpoint of the above action, preferred positions and shapes of the groove 31 of the first pressure-sensitive adhesive layer 3 are as follows.
The cross-sectional shape of the groove 31 is not particularly limited, and the angle between the groove bottom and the side wall of the groove is vertical, and the angle between the groove bottom and the side wall of the groove is not vertical. The tapered groove may have a taper type in which the width of the groove is enlarged in the surface direction of the first pressure-sensitive adhesive layer, or a reverse taper type in which the width is reduced. The shape of the plurality of concave grooves 31 may be different from each other, and the sizes may be different.

The depth of the groove 31 is preferably 5 to 35 μm, more preferably 8 to 30 μm, from the viewpoint of air permeability and manufacturability.
The width of the groove 31 is preferably 30 to 300 μm, more preferably 50 to 200 μm, from the viewpoints of air permeability, shape retention, and manufacturability. In addition, the width | variety of the groove groove 31 in this invention means the width | variety of the groove groove 31 in the 1st adhesive layer 3 surface.
The pitch between the concave grooves 31 is preferably 200 μm to 2 mm, more preferably 300 to 1000 μm, from the viewpoint of air permeability and manufacturability. In addition, the pitch of the groove groove 31 in this invention means the distance between the adjacent groove grooves 31 in the 1st adhesive layer 3 surface.

  The concave grooves 31 are preferably formed substantially in parallel from the viewpoint of manufacturability. Moreover, it is preferable that the adjacent groove grooves 31 communicate with each other from the viewpoint of air permeability, and it is particularly preferable that the groove grooves 31 are formed in a lattice shape or an oblique lattice shape.

  The concave groove 31 may be formed on any surface of the first pressure-sensitive adhesive layer 3. That is, the first pressure-sensitive adhesive layer 3 may be formed on the surface that contacts the base material 2 or may be formed on the surface that contacts the second pressure-sensitive adhesive layer 4. However, since it is preferable from the viewpoint of air permeability that the groove 31 and the through hole 41 of the second pressure-sensitive adhesive layer 4 communicate with each other, the groove 31 is formed on the surface that contacts the second pressure-sensitive adhesive layer 4. It is particularly preferred that it is formed. When the groove 31 is formed on the surface in contact with the second pressure-sensitive adhesive layer 4, the base material 2 and the first pressure-sensitive adhesive layer 3 are in close contact without having a cavity, and the pressure-sensitive adhesive sheet of the present invention is It is particularly excellent in adhesion between the pressure-sensitive adhesive layer and the substrate.

  In the pressure-sensitive adhesive sheet of the present invention, the second pressure-sensitive adhesive layer 4 has a plurality of through holes 41 (41a and 41b) penetrating from one surface of the second pressure-sensitive adhesive layer 4 to the other surface. By the action of the through-hole 41, air trapped between the pressure-sensitive adhesive sheet and the adherend can be expelled to prevent or remove air accumulation. In FIG. 1, two through holes 41a and 41b are shown, but the present invention is not limited to this.

From the viewpoint of the above action, preferred positions and shapes of the through holes 41 of the second pressure-sensitive adhesive layer 4 are as follows.
The hole diameter of the through hole 41 is preferably 30 μm to 2 mm, more preferably 50 μm to 1 mm, from the viewpoint of air permeability, adhesion, and manufacturability.
The pitch between the through holes 41 is preferably 100 μm to 12 mm, more preferably 200 μm to 8 mm, from the viewpoint of air permeability, adhesion, and manufacturability. The through holes 41 need not be provided at a regular pitch, and may be provided at an irregular pitch.

  The shape of the through hole 41 is not particularly limited, and may be a cylindrical shape, or may be a right truncated cone shape (tapered shape) in which the hole diameter is gradually reduced or expanded from one surface to the other surface. The shape of the plurality of through holes 41 may be different from each other and may be different in size.

  It is particularly preferable that the groove 31 of the first pressure-sensitive adhesive layer 3 communicates with the through hole 41 of the second pressure-sensitive adhesive layer 4 from the viewpoint of air permeability. Therefore, it is preferable that the widths and pitches of the groove 31 and the through hole 41 are determined so that the number of places where both communicate is maximized.

The material of the substrate 2 is not particularly limited, and can be appropriately selected from any materials that can be used as the substrate of the pressure-sensitive adhesive sheet. Specific examples include, for example, polyolefin resins such as polyethylene and polypropylene, ethylene copolymer resins such as ethylene-vinyl acetate copolymer and ethylene-vinyl chloride copolymer, polystyrene resins such as polystyrene, ABS resin, and AS resin. Resins, polyamide resins such as 6-nylon and 6,6-nylon, polyester resins such as polyethylene terephthalate, polybutylene terephthalate and polyethylene naphthalate, polycarbonate resins such as polycarbonate and polyester carbonate, polyvinyl chloride, polyvinylidene chloride Examples thereof include chlorine-based resins such as acrylic resins such as polymethyl methacrylate and polyethyl methacrylate, plastic sheets such as polyurethane-based resins, and papers such as high-quality paper and glassine paper.
The thickness of the base material 2 used in the present invention is not particularly limited and is appropriately set depending on the application, etc., but is generally 10 μm to 1 mm from the viewpoint of ease of handling, It is preferable that it is 20-500 micrometers.
As shown in FIG. 1, the surface of the base material 2 is flat with no through-holes formed thereon, can maintain a barrier property as a film, and can be printed neatly.

Examples of the pressure-sensitive adhesive used for the first pressure-sensitive adhesive layer 3 and the second pressure-sensitive adhesive layer 4 include acrylic, rubber-based, silicone-based, epoxy-based, polyester-based, urethane-based, and polyolefin-based materials. However, the present invention is not limited to these, and any one can be appropriately selected and used.
The pressure-sensitive adhesives used for the first pressure-sensitive adhesive layer 3 and the second pressure-sensitive adhesive layer 4 may be the same as or different from each other.

  The thickness of the first pressure-sensitive adhesive layer 3 is preferably 15 to 90 μm, more preferably 20 to 60 μm, from the viewpoints of economy and productivity. In addition, the thickness of the second pressure-sensitive adhesive layer 4 is preferably 5 to 50 μm, more preferably 10 to 40 μm, from the viewpoints of economy and productivity.

  The release sheet 5 that can be used in the present invention is not particularly limited, and those usually used, for example, paper substrates such as fine paper and glassine paper, and polyolefins such as polyethylene and polypropylene are used for these paper substrates. Laminated paper, polyolefin sheet, polyester sheet or other plastic sheet coated with a release agent such as silicone can be used. The thickness of the release sheet 5 is not particularly limited, but is usually 30 to 300 μm.

With reference to FIGS. 2 and 3, a mechanism for expelling the air caught between the pressure-sensitive adhesive sheet and the adherend surface when the pressure-sensitive adhesive sheet shown in FIG. 1 is attached to the adherend will be described. FIG.2 and FIG.3 is sectional drawing which shows the one aspect | mode of the state after sticking an adhesive sheet to a to-be-adhered body, or after sticking.
As shown in FIG. 2, when the pressure-sensitive adhesive sheet 1 from which the release sheet 5 has been peeled is attached to the adherend 6, the groove grooves 31a and 31c and the through holes 41a and 41b communicate with each other. Even if air is caught between the second pressure-sensitive adhesive layer 4 and the adherend 6, the air can escape through the through holes 41 a and 41 b and the groove 31 a and 31 c, thereby forming an air pocket. Can be prevented.
When air is entrained between the second pressure-sensitive adhesive layer 4 and the adherend 6 to form an air reservoir 7, the pressure-sensitive adhesive sheet 1 has a bulging portion (so-called “blowing”) on the surface on the substrate side. . When this pressure-sensitive adhesive sheet 1 is pressure-bonded from the central part of the pressure-sensitive adhesive sheet 1 toward the peripheral edge using a squeegee or the like, the entrained air is formed into the groove 31b of the first pressure-sensitive adhesive layer 3 as shown in FIG. The second pressure-sensitive adhesive layer 4 is pushed up along the line. The concave groove 31b located in the upper part of the air pocket 7 is deformed by the pushed up second adhesive layer 42. As a result, the air reservoir 7 is removed, and instead, a cavity 8 is formed that communicates with the end of the adhesive sheet 1 along the groove 31b. The air existing between the adherend 6 and the second pressure-sensitive adhesive layer 4 and the gas generated from the adherend after sticking move through the cavity 8 and are discharged outside. Therefore, the pressure-sensitive adhesive sheet 1 of the present invention can be adhered to the adherend 6 without removing the bulging portion formed on the surface on the base material side and impairing the appearance.
In the portion where the through hole 41 and the cavity 8 are not formed, the second pressure-sensitive adhesive layer 4 and the adherend 6 are in close contact with each other over a wide area. Therefore, the pressure-sensitive adhesive sheet 1 of the present invention is excellent in adhesion with the adherend.

Next, the manufacturing method of the adhesive sheet of this invention is demonstrated. Although the manufacturing method of the adhesive sheet of this invention is not specifically limited, It is preferable to manufacture with the following method.
A first pressure-sensitive adhesive layer having a groove groove communicating with the edge of the base material on at least one surface of the base material, and a second pressure-sensitive adhesive layer having a plurality of through holes penetrating from one surface to the other surface A method for producing a pressure-sensitive adhesive sheet laminated in this order,
(A1) providing at least one surface of the base material with a first pressure-sensitive adhesive layer in which a concave groove communicating to the end is formed;
(A2) After applying a pressure-sensitive adhesive to the release surface of the release sheet and coating the pressure-sensitive adhesive layer, the adhesive layer is irradiated with a laser beam to form a through-hole, on the release sheet, A step of providing a second pressure-sensitive adhesive layer having a through hole; and (a3) a base material provided with a first pressure-sensitive adhesive layer in step (a1) and a release sheet provided with a second pressure-sensitive adhesive layer in step (a2) Including a step of bonding the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer in contact with each other.

In the step (a1), the method of providing the first pressure-sensitive adhesive layer in which the concave groove communicating to the end is provided is not particularly limited, and can be performed by any method.
When the groove 31 is formed on the surface of the first pressure-sensitive adhesive layer in contact with the second pressure-sensitive adhesive layer, for example, by embossing using an embossing roll, laser processing, or other methods on the substrate. A method of directly providing a pressure-sensitive adhesive layer in which grooves are formed, a pressure-sensitive adhesive layer formed with a film by casting or the like on a release sheet having a concavo-convex shape on the surface, and providing this pressure-sensitive adhesive layer Examples thereof include a method of removing the release sheet after the layer is attached to the substrate, a method of coating a flat pressure-sensitive adhesive layer on the substrate, and a method of coating the pressure-sensitive adhesive layer on the substrate.

Moreover, as above-mentioned, the groove groove may be formed in the surface contact | abutted to the base material in a 1st adhesive layer. In this case, a flat pressure-sensitive adhesive layer is formed on the release sheet by casting or the like, and embossing or laser treatment using an embossing roll is performed on the pressure-sensitive adhesive layer. Examples of the method include forming a pressure-sensitive adhesive layer in which grooves are formed by applying a pressure-sensitive adhesive layer, and attaching the pressure-sensitive adhesive layer to a substrate.
It does not restrict | limit especially as a method of forming a flat adhesive layer, It can carry out by arbitrary methods. Specific examples include a screen printing method, a gravure printing method, a T-die extrusion method, a curtain method, a transfer method, or a roll coater method. In addition, the method of providing the adhesive layer in a streak shape is not particularly limited, and can be performed by any method, and examples include the methods listed above, a roll coater method using a comb blade, and a T-die extrusion method. .

In the step (a2), the method of coating the pressure-sensitive adhesive layer on the release surface of the release sheet and coating the pressure-sensitive adhesive layer is not particularly limited, and any method can be used. Specific examples include a screen printing method, a gravure printing method, a T-die extrusion method, a curtain method, a transfer method, or a roll coater method.
In the step (a2), the method of irradiating the laser beam to form the through hole is not particularly limited, and can be performed by any method. For example, you may refer the description of Unexamined-Japanese-Patent No. 2005-336249.
The through-hole can be formed by a method other than laser processing, for example, by punching, hot needle, drill, flat die cut, rotary die cut, or the like.

  In the step (a3), when the base material and the release sheet are bonded together, the groove formed in the first pressure-sensitive adhesive layer and the through-hole formed in the second pressure-sensitive adhesive layer are not filled. It is appropriate to laminate.

The pressure-sensitive adhesive sheet of the present invention thus obtained can be obtained by a general printing method such as gravure printing, screen printing, offset printing, flexographic printing, etc. on the surface of the base material on which the pressure-sensitive adhesive layer is not laminated. Printing can be performed, and further, laminating can be performed. Since the through-hole is not formed in the base-material surface and the adhesive sheet of this invention is flat, it can hold | maintain the barrier property as a film and can perform printing and a lamination process neatly.
The pressure-sensitive adhesive sheet of the present invention can be used, for example, as a decorative pressure-sensitive adhesive sheet, a printing pressure-sensitive adhesive sheet, a surface protective pressure-sensitive adhesive sheet, or the like, and can also be suitably used as a large display label such as a marking film.

  As mentioned above, although this invention was demonstrated based on the preferable embodiment, this invention is not restrict | limited to the said embodiment. For example, in the said embodiment, although the single-sided adhesive sheet in which the adhesive layer was laminated | stacked only on one side of the base material was demonstrated, the double-sided adhesive sheet by which the adhesive layer was laminated | stacked on both surfaces of the base material is also this invention. Included in the range.

  EXAMPLES Hereinafter, although this invention is demonstrated further in detail based on an Example, this invention is not limited to these.

Example 1
<Preparation of adhesive sheet 101>
Polyethylene is melt-extruded to a fine paper of 110 g / m ² to a thickness of 30 μm and laminated, and a silicone resin (manufactured by Shin-Etsu Chemical Co., Ltd., trade name: “KS847H”) is applied to the polyethylene side to obtain a thickness of 0. A release sheet A was formed by forming a 1 μm release treatment layer. On the side of the release treatment layer of this release sheet A, a convex frustoconical shape with a height of 20 μm, a top width of 7 μm, and a bottom width of 90 μm and a 200 × 200 μm grid are formed by embossing using a metal roll. A shape transfer surface composed of a concave portion was formed.
Next, an adhesive layer having a thickness of 30 μm was formed on the release treatment layer of the release sheet A with an acrylic adhesive (trade name: “PK”, manufactured by Lintec Corporation), and then the thickness of the adhesive layer was increased. A pressure-sensitive adhesive sheet A with a release sheet having a first pressure-sensitive adhesive layer provided with a grid-like groove was pasted by bonding a 50 μm polyvinyl chloride base sheet (trade name: “FP5011”, manufactured by Lintec Corporation). .
On the other hand, an acrylic pressure-sensitive adhesive (trade name, manufactured by Lintec Corporation) is applied to the release treatment surface of release sheet B (trade name: “SP-PET3801”, manufactured by Lintec Corporation) having a flat release processing surface coated with a release agent on the surface. : “PK”) to a thickness of 30 μm and heated to crosslink to form an adhesive layer. Subsequently, the pressure-sensitive adhesive layer was irradiated with a carbon dioxide laser using a laser drilling machine (manufactured by Matsushita Industrial Equipment Co., Ltd., trade name: “YB-HCS03”), and a through hole having a hole diameter of 100 μm at a pitch of 2 mm × 3 mm in width. As a result, a perforated pressure-sensitive adhesive sheet B having a second pressure-sensitive adhesive layer provided with through holes was obtained. The laser irradiation conditions were 2-shot burst processing, frequency: 3000 Hz, pulse width: 50 μsec (first shot) / 40 μsec (second shot).
Thereafter, the release sheet A is peeled off from the pressure-sensitive adhesive sheet A, and the first pressure-sensitive adhesive layer surface of the pressure-sensitive adhesive sheet A and the second pressure-sensitive adhesive layer of the pressure-sensitive adhesive sheet B are brought into contact with each other and laminated. Was made.

Example 2
<Preparation of adhesive sheet 102>
A pressure-sensitive adhesive sheet 102 was produced in the same manner as in Example 1 except that the thickness of the pressure-sensitive adhesive layer formed on the release treatment layer of the release sheet B was changed to 50 μm.

Examples 3-5
<Preparation of adhesive sheets 103-105>
Adhesive sheets 103 to 105 were produced in the same manner as in Example 1 except that the pitch of the through holes was changed to 0.5 mm × 0.5 mm, 4 mm × 6 mm, and 6 mm × 9 mm, respectively.

Example 6
<Preparation of adhesive sheet 106>
The pressure-sensitive adhesive layer formed on the release sheet B is punched using a flat die-cutting device (trade name: “PFR-S20” manufactured by UHT Co., Ltd.), and a through hole having a hole diameter of 1 mm at a pitch of 3 mm × 3 mm. A pressure-sensitive adhesive sheet 106 was produced in the same manner as in Example 1 except that was formed.

Examples 7 and 8
<Preparation of adhesive sheets 107 and 108>
On the release treatment layer side of the release sheet A, it is formed in a grid shape of 550 μm × 550 μm by embossing using a metal roll with a height of 18 μm, a top width of 25 μm, and a bottom width of 75 μm and a frustoconical shape. Adhesive sheets 107 and 108 were produced in the same manner as in Examples 1 and 6, respectively, except that a shape transfer surface composed of concave portions was formed.

Examples 9 and 10
<Preparation of adhesive sheets 109 to 110>
On the release treatment layer side of the release sheet A, a convex frustoconical shape with a height of 20 μm, a top width of 200 μm, and a bottom width of 300 μm, and a grid of 1000 μm × 1000 μm is formed by embossing using a metal roll. Adhesive sheets 109 to 110 were produced in the same manner as in Examples 1 and 6, respectively, except that a shape transfer surface composed of concave portions was formed.

<Evaluation>
When the pressure-sensitive adhesive layer surfaces of the pressure-sensitive adhesive sheets 101 to 110 produced in Examples 1 to 10 were observed with a microscope, it was confirmed that there was a portion where the concave groove and the through hole communicated.
Regarding the pressure-sensitive adhesive sheets 101 to 110 obtained above, the thickness of the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer, the depth, width, pitch, and shape of the groove groove, the pitch of the through holes, the hole diameter, and the formation thereof. The means are shown in Tables 1 and 2, respectively.
Moreover, about the pressure-sensitive adhesive sheets 101 to 110 obtained above, the air release properties were evaluated by the following methods. The results are shown in Tables 1 and 2.
(Air release)
Place the pressure-sensitive adhesive layer surface of the pressure-sensitive adhesive sheet from the 5 cm x 5 cm pressure-sensitive adhesive sheet with a release sheet on a melamine-coated iron plate (length 7 cm x width 15 cm). Affixed to allow air accumulation. The squeegee was rubbed to push out the air reservoir, and the state of air loss was visually evaluated as follows.
○: Air pocket disappeared.
X: Air pocket remained.

As is clear from Tables 1 and 2, all of the pressure-sensitive adhesive sheets of Examples 1 to 10 could easily remove air pockets, and the appearance at the time of application was also good. Moreover, the barrier property of the substrate could be maintained.
Further, according to JIS Z 0237, when the adhesive force after 24 hours of adherence of the adherend was measured under the conditions of a peeling angle of 180 degrees and a peeling speed of 300 mm / min, the adhesive sheets of Examples 1 to 10 were all based on No peeling occurred between the material and the pressure-sensitive adhesive layer, and the adhesion to the adherend was excellent. Furthermore, when printing was performed on the substrate surface of the pressure-sensitive adhesive sheets of Examples 1 to 10, all were excellent in printability on the substrate surface.

  The pressure-sensitive adhesive sheet of the present invention is particularly suitable as a large-sized pressure-sensitive adhesive sheet such as a pressure-sensitive adhesive sheet for decoration, a marking film, a pressure-sensitive adhesive sheet for protecting a surface of a metal plate or the like.

DESCRIPTION OF SYMBOLS 1 Adhesive sheet 2 Base material 3 1st adhesive layer 31 (31a, 31b, and 31c) Groove 4 Second adhesive layer 41 (41a and 41b) Through-hole 42 Deformation part of 2nd adhesive layer 5 Release sheet 6 Substrate 7 Air reservoir 8 Cavity

Claims (7)

  A first pressure-sensitive adhesive layer having a groove groove communicating with the edge of the base material on at least one surface of the base material, and a second pressure-sensitive adhesive layer having a plurality of through holes penetrating from one surface to the other surface A pressure-sensitive adhesive sheet laminated in this order.   The pressure-sensitive adhesive sheet according to claim 1, wherein the concave groove of the first pressure-sensitive adhesive layer is formed on a surface opposite to the side in contact with the base material.   The pressure-sensitive adhesive sheet according to claim 1 or 2, wherein the groove groove of the first pressure-sensitive adhesive layer communicates with the through hole of the second pressure-sensitive adhesive layer.   The width | variety of the said groove groove is 30-300 micrometers, the depth of the said groove groove is 5-35 micrometers, and the pitch between the said groove grooves is 200 micrometers-2 mm in any one of Claims 1-3. The adhesive sheet as described.   The pressure-sensitive adhesive sheet according to any one of claims 1 to 4, wherein the concave groove is formed in a lattice shape.   The pressure-sensitive adhesive sheet according to any one of claims 1 to 5, wherein a hole diameter of the through holes is 30 µm to 2 mm, and a pitch between the through holes is 100 µm to 12 mm. A first pressure-sensitive adhesive layer having a groove groove communicating with the edge of the base material on at least one surface of the base material, and a second pressure-sensitive adhesive layer having a plurality of through holes penetrating from one surface to the other surface A method for producing a pressure-sensitive adhesive sheet laminated in this order,
(A1) providing at least one surface of the base material with a first pressure-sensitive adhesive layer in which a concave groove communicating to the end is formed;
(A2) After applying a pressure-sensitive adhesive to the release surface of the release sheet and coating the pressure-sensitive adhesive layer, the adhesive layer is irradiated with a laser beam to form a through-hole, on the release sheet, A step of providing a second pressure-sensitive adhesive layer having a through hole; and (a3) a base material provided with a first pressure-sensitive adhesive layer in step (a1) and a release sheet provided with a second pressure-sensitive adhesive layer in step (a2) Including a step of bonding the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer in contact with each other.

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