JP2013049818A - Adhesive sheet and method for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a means with which floating and peeling hardly occur even when pasting on an adherend having a corrugated shape, while securing deaerating capability at pasting on the adherend in an adhesive sheet.SOLUTION: This adhesive sheet includes a base sheet and the adhesive layer disposed on one surface of the base sheet and containing self-adhesive. On the surface of the adhesive layer opposite to the base sheet, a plurality of recessed grooves are formed. In that case, the plurality of recessed grooves are formed (1) to open at the end edge part of the base sheet, (2) not to communicate with each other, and (3) to have angles of >0° to less than 90° to the flow direction of the base sheet for at least a part of the plurality of recessed grooves.

Description

  The present invention relates to an adhesive sheet and a method for producing the same. In more detail, the present invention is suitably used as a marking film that is easy to release air when affixed to an adherend and is not required to lift off even when affixed to an adherend having a corrugated shape. The present invention relates to a pressure-sensitive adhesive sheet and a method for efficiently producing the pressure-sensitive adhesive sheet.

  Conventionally, a pressure-sensitive adhesive sheet is generally composed of a base sheet, a pressure-sensitive adhesive layer formed on the surface thereof, and a release sheet usually provided thereon. In use, the release sheet is peeled off and pasted so that the pressure-sensitive adhesive layer is in contact with the adherend.

  However, when the area of the pressure-sensitive adhesive sheet is large to some extent, an air stay tends to remain between the pressure-sensitive adhesive layer and the adherend, and the portion of the air stay becomes a so-called “bulge” and stuck. There was a problem that a swelling occurred on the surface side of the pressure-sensitive adhesive sheet, making it difficult to stick the pressure-sensitive adhesive sheet cleanly.

  Therefore, in order to solve such a problem, for example, in Patent Document 1, in the pressure-sensitive adhesive sheet having a pressure-sensitive adhesive layer on the surface of the base material sheet, the edge portion of the base material sheet is formed on the surface of the pressure-sensitive adhesive layer. A taper-type groove groove that opens in a slanted lattice shape with respect to the sticking direction (flow direction of the base sheet), and in the adhesive layer, the area of the flat part is 50 to 90%, and the concave part with respect to the flat part is formed. A technique is disclosed in which the groove groove cut angle is 20 to 75 °, the upper surface opening width of the groove groove is 10 to 80 μm, and the groove groove depth is 5 to 50 μm. The technique described in Patent Document 1 is intended to prevent the uneven structure and the groove structure from appearing on the surface of the base material while ensuring the air bleeding performance at the time of application to the adherend. . In Patent Document 1, in order to improve the air bleeding performance at the time of application to an adherend, the concave groove in the pressure-sensitive adhesive layer is “oblique” with respect to the application direction (flow direction of the base sheet). It is said that it should be formed in a “lattice shape”. More specifically, each angle of the groove group that rises to the right shoulder and the groove group that rises to the left shoulder with respect to the central axis of the adhesive sheet (adhesive layer) is preferably 20 to 70 ° ( More preferably, the range is 40 to 50 °.

  On the other hand, in Patent Document 2, in the pressure-sensitive adhesive sheet having the same general configuration as that of Patent Document 1, a plurality of concave grooves that open to the edge portion of the base material sheet are formed in a lattice shape or in parallel as an uneven pattern of the pressure-sensitive adhesive layer. And the interval between the grooves facing each other is greater than 500 μm and 2 mm or less, the opening width is 10 to 200 μm, the depth is 5 to 100% of the thickness of the adhesive layer, and It has been proposed that the shape transfer coefficient of the base sheet defined by the equation is 5.6 or less. The technique described in Patent Document 2 also prevents the concavo-convex structure and the groove structure from appearing on the surface of the base material while ensuring the air bleeding performance at the time of application to the adherend, similarly to Patent Document 1. It is for the purpose. In Patent Document 2, reference is made to the direction (angle) at which the grid-like (or parallel) grooves are formed in the pressure-sensitive adhesive layer with respect to the flow direction and the width direction of the base sheet. Not.

  Such an adhesive sheet is printed on the surface and may be used for vehicle advertisements such as buses, railway vehicles, and trucks. For example, in Patent Document 3, in an automobile in which an advertisement medium is provided on a vehicle body such as a bus, the advertisement medium includes a lattice-like portion on the back side of an advertisement film body on which advertising characters, patterns, or pictures are drawn. If it is, it is described that it can be applied easily and neatly.

Table 2003/025078 JP 2010-180271 A JP 2002-120737 A

  As described above, according to the techniques disclosed in Patent Document 1 and Patent Document 2, air bleeding performance at the time of application to an adherend is ensured to some extent, and the uneven structure and groove structure on the surface of the substrate are provided. It is preferable in that it is prevented from being raised. However, according to the study of the present inventor, even when the above-described conventional technique is used, it is found that the adhesive sheet peels off and rises when attached to an adherend having a corrugated shape such as a side surface of a vehicle body. did. Some truck luggage compartments and side surfaces of railway vehicles have corrugated shapes to maintain strength. To attach the adhesive sheet to the corrugated surface, first temporarily fix the adhesive sheet on the corrugated ridge line, and then crimp the adhesive sheet from the ridge to the valley using a squeegee. . Since stress remains in the pressure-sensitive adhesive sheet attached to the valley, the pressure-sensitive adhesive sheet contracts and rises from the valley when time passes.

  The present invention has been made in view of the above-described state of the art in the prior art, and in the pressure-sensitive adhesive sheet, when affixed to an adherend having a corrugated shape while ensuring air bleed performance during application to the adherend It is another object of the present invention to provide a means that is less likely to lift off.

  The present inventor has intensively studied to solve the above problems. As a result, when forming a plurality of grooves on the surface of the pressure-sensitive adhesive layer, the plurality of grooves are formed so as not to communicate with each other and to be inclined with respect to the flow direction of the base sheet. The present inventors have found that the above problems can be solved, and have completed the present invention.

The pressure-sensitive adhesive sheet of the present invention has a base material sheet and a pressure-sensitive adhesive layer that is disposed on one surface of the base material sheet and contains a pressure-sensitive adhesive. And a plurality of groove grooves are formed on the surface of the pressure-sensitive adhesive layer opposite to the base sheet, and in this case, the plurality of groove grooves are
(1) so that it opens to the edge part of the said base material sheet, and
(2) Do not communicate with each other,
(3) At least a part of the plurality of concave grooves has an angle of more than 0 ° and less than 90 ° with respect to the flow direction of the base sheet.
It is characterized in that it is formed.

  According to the present invention, it is possible to provide a pressure-sensitive adhesive sheet that is less likely to be lifted off when adhered to an adherend having a corrugated shape while ensuring air bleeding performance when adhered to the adherend.

It is sectional drawing of the adhesive sheet of one Embodiment of this invention. It is a top view of the surface (surface on the opposite side to a base material sheet) in which the groove was formed of the adhesive layer of the adhesive sheet shown in FIG. It is the photograph which observed the peeling sheet formed in Example 1 using the scanning electron microscope (SEM). It is the photograph which observed the peeling sheet formed in the comparative example 1 using the scanning electron microscope (SEM). It is explanatory drawing for demonstrating the shape and dimension of a corrugated board used in order to evaluate floating peeling in an Example.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted. In addition, the dimensional ratios in the drawings are exaggerated for convenience of explanation, and may be different from the actual ratios.

  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 adhesive sheet 10 first has an adhesive sheet main body 11. The pressure-sensitive adhesive sheet main body 11 is formed by laminating a base sheet 12 and a pressure-sensitive adhesive layer 13. In the pressure-sensitive adhesive sheet 10 of this embodiment, a release sheet 14 is further laminated on the pressure-sensitive adhesive sheet body 11.

[Base material sheet]
In the form shown in FIG. 1, the base material sheet 12 consists of a polyvinyl chloride film, for example. However, there is no restriction | limiting in particular as the base material sheet 12, Arbitrary things can be suitably selected and used from the plastic sheet and synthetic paper currently used as a base material sheet of an adhesive sheet.

  Examples of plastic sheets include polyolefin resins such as polyethylene and polypropylene, polyester resins such as polyethylene terephthalate and polyethylene naphthalate, polystyrene resins, polyvinyl chloride resins, acrylic resins, urethane resins, polycarbonate resins, and polyamides. And a sheet made of a fluororesin such as polytetrafluoroethylene and a mixture or laminate of these resins.

  As the synthetic paper, for example, polyester synthetic paper, polypropylene foam synthetic paper, or the like can be used.

  Printing is performed on the surface of the base sheet as desired. The type of printing is preferably ink jet or thermal transfer, which allows on-demand printing.

  The thickness in particular of the base material sheet 12 is not restrict | limited, It determines suitably according to a use purpose and a condition. The thickness of the base sheet 12 is usually in the range of 10 to 300 μm, and preferably in the range of 50 to 150 μm.

[Adhesive layer]
(Adhesive)
The pressure-sensitive adhesive layer 13 includes a pressure-sensitive adhesive (not shown). There is no restriction | limiting in particular as an adhesive used for formation of the said adhesive layer 13, From what is conventionally used for the adhesive layer of a conventional adhesive sheet, arbitrary things can be selected suitably and can be used. For example, an acrylic adhesive, a rubber adhesive, a silicone adhesive, a polyurethane adhesive, a polyester adhesive, and the like can be used. The thickness of the pressure-sensitive adhesive layer 13 (the thickness of a portion where a groove to be described later is not formed) is usually in the range of 5 to 100 μm, and preferably in the range of 10 to 60 μm.

(Concave groove)
In the pressure-sensitive adhesive layer 13, a plurality of concave grooves 13 a are formed on the surface opposite to the base sheet 12 (the lower surface of the pressure-sensitive adhesive layer 13 shown in FIG. 1). The pressure-sensitive adhesive sheet 10 of the present invention is characterized by a form in which the plurality of concave grooves 13a are formed.

  FIG. 2 is a plan view of the surface of the pressure-sensitive adhesive layer 13 of the pressure-sensitive adhesive sheet 10 shown in FIG. 1 on which the groove 13a is formed (the surface opposite to the base material sheet 12). As shown in FIG. 2, in the present embodiment, a plurality of concave grooves 13 a are formed on the surface of the pressure-sensitive adhesive layer 13. The concave groove 13 a is formed so as to open at the edge of the base sheet 12. Further, the plurality of concave grooves 13a are formed in parallel to each other so that they do not communicate with each other. The plurality of parallel grooves 13a parallel to each other have an angle of 45 ° (angle θ shown in FIG. 2) with respect to the flow direction of the base sheet 12 (the arrow direction and the central axis C shown in FIG. 2). It is formed as follows. In FIG. 2, the angle θ is on the right side with respect to the flow direction, but may be on the left side.

  As shown in FIG. 2, the groove groove 13 a is formed so as to open at the edge of the base sheet 12, whereby an air circulation path is secured, and the adhesive sheet 10 is attached to the adherend. Since air escapes through this distribution path, air accumulation does not occur, and the pressure-sensitive adhesive sheet can be adhered to the adherend with good adhesion.

  Further, when a plurality of concave grooves provided on the surface of the pressure-sensitive adhesive layer communicate with each other as in the prior art (for example, Patent Document 1), the adhesive layer is formed at a portion where the concave grooves communicate with each other. Corners will be produced. If such a corner exists, the pressure-sensitive adhesive layer easily peels from the corner, and for example, when pasted on a concave portion of an adherend having a concavo-convex structure, floating occurs in the concave portion after a certain period of time. End up. On the other hand, in this embodiment, as shown in FIG. 2, such a corner | angular part does not exist because it forms so that the several groove 13a may not mutually communicate. As a result, it is possible to provide a pressure-sensitive adhesive sheet that is unlikely to lift off.

  Furthermore, in this embodiment, as shown in FIG. 2, the plurality of concave grooves 13a are formed obliquely with respect to the flow direction of the base sheet, thereby relieving the shrinkage stress remaining on the base sheet. There is also an advantage that it can be done. Since the base sheet is formed while being stretched in the flow direction, a stress that tends to shrink in the flow direction remains. Further, when being applied to the adherend having a corrugated shape, the base sheet is stretched in a direction perpendicular to the corrugated ridge line portion, and therefore the base sheet has a stress that tends to shrink in a direction perpendicular to the ridge line portion. Remains. In the part where the concave groove is formed on the surface of the pressure-sensitive adhesive layer, the base material sheet is not fixed to the adherend, so the contraction stress is relaxed. The concave groove is formed obliquely with respect to the flow direction of the base sheet, so that the flow direction of the base sheet is pasted so as to be perpendicular to the corrugated ridge line portion, and so as to be parallel Any of the cases where it is applied can relieve the stress.

  In addition, there is no restriction | limiting in particular about the shape and size of each concave groove 13a, and mutual positional relationship, as long as the conditions prescribed | regulated to the claim are satisfied. As an example, the shape of each concave groove 13a includes, for example, a V-shaped cross section, an inverted trapezoidal shape, a tapered U-shape, or the like. In addition, from the viewpoint of easy air removal and the balance of adhesive force, the opening width of each groove 13a is 10 to 200 μm, preferably 20 to 100 μm, and more preferably 30 to 70 μm. Moreover, the depth of each groove 13a is 5 to 100% of the thickness of the adhesive layer 13, and it is preferable that it is 10 to 80%. Further, in the case where the plurality of groove grooves 13a are formed in parallel to each other as shown in FIG. 2, there is no particular limitation on the interval (pitch) between the adjacent groove grooves 13a, but preferably 100 to 1000 μm. More preferably, it is 300-800 micrometers. Furthermore, the ratio of the area of the site | part (flat part) in which the groove 13a is not formed in the surface of the adhesive layer 13 becomes like this. Preferably it is 50 to 90%, More preferably, it is 70 to 90%.

  In the form shown in FIG. 2, the plurality of grooves 13 a are formed to have an angle of 45 ° with respect to the flow direction of the base sheet 12 (the arrow direction and the central axis shown in FIG. 2). The technical scope of the present invention is not limited to such a form. That is, at least a part of the plurality of groove grooves 13a (a part of one groove groove 13a or a subset of the plurality of groove grooves 13a) exceeds 90 ° with respect to the flow direction of the base sheet. It only needs to be formed so as to have an angle of less than 0 °. Here, in the case where the plurality of groove grooves 13a are formed in parallel to each other as shown in FIG. 2, these groove grooves 13a are in the flow direction of the base sheet 12 (arrow direction shown in FIG. 2). The angle (angle θ shown in FIG. 2) is preferably 20 to 70 °, more preferably 30 to 60 °, still more preferably 40 to 50 °, and most preferably 45 °. By adopting such a form (the plurality of concave grooves 13a are formed so as to be inclined with respect to the flow direction of the base sheet), the above-described shrinkage stress relaxation action is sufficiently exhibited, and adhesion It becomes possible to prevent the sheet 10 from being lifted off.

[Method for producing adhesive sheet]
As the method for producing the pressure-sensitive adhesive sheet 10 of the present invention, the pressure-sensitive adhesive layer 13 formed so that the plurality of groove grooves 13a satisfy the above-described configuration can be disposed on the surface of the base sheet 12. Any method can be used. As an example of the production method, there is a method in which a pressure-sensitive adhesive layer is formed on the surface of a release sheet having a ridge corresponding to a groove, and then a base sheet is bonded to the pressure-sensitive adhesive layer. Under the present circumstances, if the following manufacturing method of this invention is followed, the target adhesive sheet can be manufactured efficiently.

That is, the method for producing a pressure-sensitive adhesive sheet according to the present invention includes:
(A) A step of forming a plurality of ridges 14a in a predetermined shape on the release treatment layer surface of the release sheet 14,
(B) the step of forming the pressure-sensitive adhesive layer 13 on the side of the release sheet 14 on which the ridges 14a are provided, and
(C) It has the process of laminating | stacking the adhesive layer 13 formed at the said (b) process on the base material sheet 12. It is characterized by the above-mentioned.
(Step (a))
In this step (a), the release sheet base material is subjected to shape processing by a known method using a metal roll or the like to form a plurality of ridges in a predetermined shape, and a release agent such as silicone is applied thereto. And providing a release treatment layer to form a shape transfer surface.

((B) Process)
In the step (b), in the step (a) described above, the pressure-sensitive adhesive layer is formed by a conventionally known method on the release treatment layer of the release sheet provided with the shape transfer surface (plural ridges). It is a process. In this way, a pressure-sensitive adhesive layer with a release sheet is obtained.

(Step (c))
In this (c) process, it is a process of laminating | stacking the said adhesive layer on a base material sheet by bonding a base material sheet to the adhesive layer with a peeling sheet obtained at the (b) process mentioned above. Thus, as shown in FIG. 1, this invention which has the base material sheet 12, the adhesive layer 13 in which the several groove 13a was formed in the predetermined shape and positional relationship, and the peeling sheet 14 The adhesive sheet 10 can be manufactured. In addition, when using the pressure-sensitive adhesive sheet 10 thus manufactured, the release sheet 14 is peeled off, the pressure-sensitive adhesive layer 13 is brought into contact with the adherend, and is applied while applying pressure with a squeegee or a finger, Since each groove 13a serves as an air flow path and air does not escape and air accumulation does not occur, it can be easily and cleanly attached with good adhesion. Further, when the pressure-sensitive adhesive sheet 10 is affixed to the concave portion of the adherend having a concavo-convex structure, the sheet is prevented from being lifted off even when a long period of time has elapsed.

(Peeling sheet)
As the release sheet 14 used in the present invention, for example, a paper base such as fine paper, glassine paper, coated paper, laminated paper obtained by laminating a thermoplastic resin such as polyethylene on these paper bases, or polyethylene terephthalate, Examples thereof include those obtained by applying a release agent layer such as silicone to a polyester film such as polybutylene terephthalate or polyethylene naphthalate, or a plastic film such as a polyolefin film such as polypropylene or polyethylene and providing a release agent layer. Although there is no restriction | limiting in particular about the thickness of this peeling sheet, Usually, it is about 30-180 micrometers.

  Hereinafter, the present invention will be described in more detail with reference to examples. However, the technical scope of the present invention should be determined based on the description of the scope of claims, and should not be limited only to the following examples.

[Example 1]
Laminated polyethylene with a thickness of 30 μm on high-quality paper with a basis weight of 110 g / cm ² , a convex strip with a predetermined shape is formed on the polyethylene side using an embossing roll, and silicone is applied to a thickness of 0.1 μm. Thus, a release sheet having a shape transfer surface was formed. The ridges had a convex shape with a cross section of 22 μm in height and 90 μm in width, and were formed in parallel with each other at an interval of 600 μm. In addition, the photograph which observed the peeling sheet formed in this way using the scanning electron microscope (SEM) is shown in FIG.

  Next, on the release treatment layer of the release sheet, an acrylic pressure-sensitive adhesive [100 parts by mass by Nippon Synthetic Chemical Industry Co., Ltd., “Coponil N-2147”, by Japan Polyurethane Industry Co., Ltd., 1 part by mass of “Coronate L”] After forming a pressure-sensitive adhesive layer having a thickness of 30 μm, a vinyl chloride film formed by a calendar method having a thickness of 80 μm was bonded to the pressure-sensitive adhesive layer as a base sheet, and the pressure-sensitive adhesive sheet having the form shown in FIG. Produced. At this time, the bonding of the base sheet to the pressure-sensitive adhesive layer is such that the parallel concave grooves 13 formed on the surface of the pressure-sensitive adhesive layer are in the flow direction of the base sheet (the arrow direction and the central axis C shown in FIG. 2). ) With an angle of 45 °.

  Using the pressure-sensitive adhesive sheet thus prepared, air bleeding performance and lift-off were evaluated by the following methods.

  First, an aluminum plate having a thickness of 500 μm was bent into a shape shown in FIG. 5 (the unit of the number is [mm]) to prepare an adherend having a corrugated shape.

  Subsequently, the pressure-sensitive adhesive sheet prepared above was placed on an adherend and temporarily fixed to a corrugated ridge line part, and then attached using a squeegee while stretching the pressure-sensitive adhesive sheet from the ridge line part toward the valley part. At this time, at the time of application to the adherend, the attachment was performed so that the flow direction of the base sheet was orthogonal to the ridgeline of the adherend. The concave groove formed in the pressure-sensitive adhesive layer forms 45 ° with respect to the ridgeline of the adherend.

  And the air bleeding performance was evaluated by observing the ease of air removal when applying a squeegee to the adherend. Moreover, the presence or absence of the peeling of the adhesive sheet in a trough was observed after 1 day, 12 days, and 30 days from pasting, respectively. The results are shown in Table 1 below. In addition, the same test was done also about Comparative Examples 1-5 mentioned later. The results are also shown in Table 1 below.

[Comparative Example 1]
A pressure-sensitive adhesive sheet was prepared in the same manner as in Example 1 described above except that the shape of the ridges formed on the release sheet was changed. Specifically, the cross-sectional shape of the ridges was a convex shape having a height of 22 μm and a width of 60 μm, and a plurality of ridges were formed in a lattice shape orthogonal to each other at intervals of 570 μm. In addition, the photograph which observed the peeling sheet formed in this way using the scanning electron microscope (SEM) is shown in FIG. Moreover, the pasting of the base material sheet to the pressure-sensitive adhesive layer is such that all of the lattice-shaped concave groove groups formed on the surface of the pressure-sensitive adhesive layer are in the flow direction of the base material sheet (the arrow direction and center shown in FIG. It was carried out with an angle of 45 ° and 135 ° with respect to the axis C). In addition, it affixed so that the flow direction of a base material sheet might be orthogonal to the ridgeline of a to-be-adhered body at the time of affixing to a to-be-adhered body. The orthogonal lattice-shaped grooves formed on the surface of the pressure-sensitive adhesive layer form 45 ° and 135 ° with respect to the ridgeline of the adherend.

[Comparative Example 2]
A pressure-sensitive adhesive sheet was produced in the same manner as in Example 1 described above, except that a release sheet having no ridges was used.

[Comparative Example 3]
The protrusions having the same dimensions as in Example 1 and formed in parallel with the flow direction of the base sheet (that is, θ = 0 ° shown in FIG. 2) were used. In addition, it affixed so that the concave groove formed in the adhesive layer might be orthogonal to the ridgeline of the above-mentioned to-be-adhered body at the time of affixing to a to-be-adhered body.

[Comparative Example 4]
The same adhesive sheet as in Comparative Example 3 described above was used. In addition, it affixed so that the concave groove formed in the adhesive layer might become parallel to the ridgeline of the above-mentioned to-be-adhered body at the time of affixing to a to-be-adhered body.

[Comparative Example 5]
The protrusions have the same dimensions as in Comparative Example 1 and one of two orthogonal groove groups that form a lattice shape is parallel to the flow direction of the base sheet (that is, θ = 0 shown in FIG. 2). Formed so that the other is perpendicular to the flow direction of the base sheet (that is, θ = 90 ° shown in FIG. 2). In addition, it affixed so that the flow direction of a base material sheet might be orthogonal to the ridgeline of a to-be-adhered body at the time of affixing to a to-be-adhered body. The orthogonal lattice grooves formed on the surface of the pressure-sensitive adhesive layer are parallel and orthogonal to the ridge line of the adherend.

  As shown in Table 1, according to the pressure-sensitive adhesive sheet of the present invention, the air release performance at the time of application to the adherend is secured, and even when it is applied to the adherend having a corrugated shape, there is no floating peeling. I understand that.

  In Comparative Examples 1 and 5 in which the concave grooves were provided in a lattice shape, the air bleeding performance was ensured, but the floating occurred. This was thought to be because the pressure-sensitive adhesive layer was easily peeled off from the corners of the pressure-sensitive adhesive layer that existed at the part where the perpendicular groove grooves communicated with each other.

  Further, in Comparative Example 3 in which the ridges were provided in parallel with the flow direction of the base sheet, the air release performance was ensured, but the floating occurred. This was considered to be due to the fact that the shrinkage stress acting with the passage of time on the base sheet stretched at the time of application to the adherend was not sufficiently relaxed.

  Furthermore, in Comparative Example 4 in which the ridges were provided so as to be orthogonal to the flow direction of the base material sheet, there was no lifting and peeling, but since air was entrained, the pasting operation took time.

10 Adhesive sheet,
11 Adhesive sheet body,
12 substrate sheet,
13 Adhesive layer,
13a concave groove,
14 release sheet,
14a ridges,
C central axis of flow direction,
θ The angle between the groove and the flow direction.

Claims (4)

A base sheet;
An adhesive layer disposed on one surface of the base sheet and containing an adhesive,
Have
On the surface of the pressure-sensitive adhesive layer opposite to the base sheet, a plurality of grooves are provided.
(1) so that it opens to the edge part of the said base material sheet, and
(2) Do not communicate with each other,
(3) At least a part of the plurality of concave grooves has an angle of more than 0 ° and less than 90 ° with respect to the flow direction of the base sheet.
A pressure-sensitive adhesive sheet which is formed.   The pressure-sensitive adhesive sheet according to claim 1, wherein the plurality of concave grooves are formed in parallel to each other.   The pressure sensitive adhesive sheet according to claim 1 or 2 whose angle of said (3) is 40-50 degrees. It is a manufacturing method of an adhesive sheet given in any 1 paragraph of Claims 1-3,
(A) A step of forming a plurality of ridges in a predetermined shape on the release layer surface of the release sheet,
(B) forming a pressure-sensitive adhesive layer on the side of the release sheet on which the ridges are provided; and
(C) The step of laminating the pressure-sensitive adhesive layer formed in the step (b) on the base sheet,
The manufacturing method of the adhesive sheet characterized by including.