JP2016008222A - Pressure sensitive adhesive sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pressure sensitive adhesive sheet capable of exerting a vent function in the thickness direction of the pressure sensitive adhesive sheet and appropriate for improving productivity.SOLUTION: A pressure sensitive adhesive sheet includes an adhesive layer. The adhesive layer has an adhesive layer penetrating hole that penetrates the adhesive layer. The adhesive layer penetrating hole is formed by piercing the adhesive layer by a projection. The size thereof is 0.5 mm or more in any one surface of the adhesive layer. The pressure sensitive adhesive sheet has volume resistivity of 1×10Ω or higher, and is configured to allow the vent of a gas from a side for bonding an adherend to a back side, through the adhesive layer penetrating hole.

Description

  The present invention relates to an adhesive sheet.

  In general, a pressure-sensitive adhesive (also referred to as a pressure-sensitive adhesive; the same shall apply hereinafter) is in the form of a soft solid (viscoelastic body) in a temperature range near room temperature and has a property of easily adhering to an adherend by pressure. Taking advantage of such properties, the pressure-sensitive adhesive is typically used in various fields in the form of a pressure-sensitive adhesive sheet having a pressure-sensitive adhesive layer formed into a thin continuous film. Patent documents 1-3 are mentioned as technical literature relevant to an adhesive sheet.

JP 2007-51269 A JP-A-2005-239956 JP 2011-153190 A

  The pressure-sensitive adhesive sheet having the pressure-sensitive adhesive layer formed in the form of a continuous film as described above, when the pressure-sensitive adhesive sheet is attached to an adherend, air, moisture, or the like between the pressure-sensitive adhesive layer and the adherend. In some cases, the fluid foreign matter remains and becomes a pool of air or moisture, causing deterioration in appearance quality. Such air pockets are not desirable in that they affect the adhesive properties such as a decrease in adhesive strength. For the purpose of avoiding the occurrence of such an event, a through-hole penetrating the adhesive sheet is formed, and air or the like remaining between the adhesive layer and the adherend is passed through the through-hole to the thickness of the adhesive sheet. Techniques for discharging in the vertical direction have been proposed (Patent Documents 1 and 2). However, in these conventional techniques, since a through hole is formed by eliminating (thermal decomposition or the like) a part of the adhesive sheet by laser processing or the like, it is difficult to improve productivity. There are also concerns about deterioration of the pressure-sensitive adhesive sheet due to heat, abnormal appearance, and a decrease in pressure-sensitive adhesive performance due to adhesion of laser processing residues. Moreover, the diameter of a through-hole is as small as 0.1-300 micrometers, and when it tries to enlarge this, there exists a problem that said phenomenon may become more remarkable. Patent Document 3 relates to a conductive pressure-sensitive adhesive tape that has a pressure-sensitive adhesive layer on a metal foil, and a part of the metal foil penetrates the pressure-sensitive adhesive layer to form a conductive portion. There is no suggestion about the emission.

  An object of this invention is to provide the adhesive sheet which can exhibit the gas venting function to the thickness direction of an adhesive sheet, and is suitable for the improvement of productivity. Another related object is to provide a method for producing such an adhesive sheet.

  According to this specification, an adhesive sheet having an adhesive layer is provided. The pressure-sensitive adhesive layer has a pressure-sensitive adhesive layer through-hole penetrating the pressure-sensitive adhesive layer. The size of the pressure-sensitive adhesive layer through-hole is 0.5 mm or more on any surface of the pressure-sensitive adhesive layer. The pressure-sensitive adhesive layer through-hole is typically formed by piercing a protrusion into the pressure-sensitive adhesive layer. The pressure-sensitive adhesive sheet is configured so that gas can be extracted from the adherend-attached surface side of the pressure-sensitive adhesive sheet to the back side of the pressure-sensitive adhesive sheet through the pressure-sensitive adhesive layer through-hole.

  In the pressure-sensitive adhesive sheet having the above-described configuration, the pressure-sensitive adhesive layer through-holes are formed by piercing the pressure-sensitive adhesive layer, so that a reduction in the amount of pressure-sensitive adhesive accompanying the formation of the pressure-sensitive adhesive layer through-holes can be avoided. The pressure-sensitive adhesive sheet is excellent in productivity and advantageous in terms of energy cost as compared with a pressure-sensitive adhesive sheet having a through hole formed by eliminating a partial region of the pressure-sensitive adhesive sheet by laser processing or the like. Moreover, the thermal deterioration and contamination of the adhesive sheet accompanying formation of an adhesive layer through-hole can be prevented.

Moreover, since the adhesive is a viscoelastic body as described above, when the protrusion pierced in the adhesive layer is removed, the adhesive that has been deformed by the protrusion tends to recover to its original shape. As a result, the pressure-sensitive adhesive sheet disclosed herein is typically in a state where the pressure-sensitive adhesive layer through-hole is closed or at least its opening area is smaller than the cross-sectional area of the protrusion. Thereby, the effective area of an adhesive layer becomes large. In addition, the pressure-sensitive adhesive layer through-hole is less noticeable in appearance.
On the other hand, where the adhesive layer through-hole is formed by piercing the protrusion, the adhesive layer is cut by the protrusion. When the pressure-sensitive adhesive layer through-hole is in a closed state, the pressure-sensitive adhesive layer through-hole can be reopened (reopened) using this cut, and the gas can be extracted to the back side of the pressure-sensitive adhesive sheet through the opening. . The pressure-sensitive adhesive layer through-hole having a size of 0.5 mm or more on the surface of the pressure-sensitive adhesive layer is preferable because it can be easily reopened from the closed state.

In a preferable embodiment of the pressure-sensitive adhesive sheet disclosed herein, the volume resistance value of the pressure-sensitive adhesive sheet is higher than 1 × 10 ¹ Ω. The pressure-sensitive adhesive sheet having such a volume resistance value can be suitably used as a pressure-sensitive adhesive sheet for applications requiring low conductivity or non-conductivity, for example.

  The adhesive sheet which concerns on one preferable aspect contains the support base material which supports this adhesive layer in addition to the said adhesive layer. By having such a support base material, the shape maintaining property of the pressure-sensitive adhesive sheet is improved and the sticking property to the adherend tends to be improved. Further, by improving the shape maintaining property, it tends to be easy to perform an operation of pressing the pressure-sensitive adhesive sheet in which air accumulation has occurred and extracting air to the back side of the pressure-sensitive adhesive sheet. The pasting property includes not only that the pasting operation is easy, but also that a good pasting state is easily realized. For example, the fact that air or the like is not substantially recognized between the pressure-sensitive adhesive layer and the adherend is excellent in stickability in that the burden of re-sticking work is reduced and the sticking is firmly performed. Leads to

  In the pressure-sensitive adhesive sheet including such a support substrate, as the support substrate, a material that is air-impermeable and has a through-hole penetrating the support substrate can be preferably used. The pressure-sensitive adhesive sheet is preferably configured such that gas can be extracted from the adherend-attached surface side to the back side through the pressure-sensitive adhesive layer through-hole and the base material through-hole. As a result, even when air accumulation or the like occurs between the adhesive layer and the adherend, the air is discharged in the thickness direction of the adhesive sheet, and the above air accumulation or the like is eliminated and a good bonding state is achieved. Can be realized. Since the support substrate is impermeable at portions other than the substrate through-holes, the adhesive layer and the adherend are well protected.

  The support substrate preferably includes a resin sheet layer. As a result, the pressure-sensitive adhesive sheet has an appropriate stiffness and tends to be excellent in adhesion to an adherend. Moreover, including a resin sheet layer is advantageous in reducing the thickness and improving the appearance.

  It is preferable that the pressure-sensitive adhesive layer through-hole is formed by piercing the protrusion from the adherend-attached surface side of the pressure-sensitive adhesive sheet. The pressure-sensitive adhesive layer through-hole thus formed tends to have a size larger on the adherend pasting surface than a size on the opposite surface (back surface). Therefore, when air is extracted from the air pool generated between the pressure-sensitive adhesive layer and the adherend through the pressure-sensitive adhesive layer through-hole, the size of the pressure-sensitive adhesive layer through-hole corresponding to the air inlet side is large, so that gas can be released. Is good. Moreover, since the size of the pressure-sensitive adhesive layer through-hole is small on the back side, it is easy to prevent air and water from entering from the back side, and the protection is excellent.

In the preferable one aspect | mode of the adhesive sheet disclosed here, the said adhesive layer through-hole is in the closed state in the normal use condition of this adhesive layer. The pressure-sensitive adhesive sheet of this aspect can have a better protective property than the pressure-sensitive adhesive sheet in which the pressure-sensitive adhesive layer through-holes remain open. Moreover, since the said adhesive layer through-hole is closed, the effective area of an adhesive layer becomes large and an adhesive layer through-hole is not conspicuous, and its external appearance is good.
The pressure-sensitive adhesive sheet according to a preferred embodiment is formed by applying a gas pressure to the adherend-adhering surface (for example, applying pressure to the back surface of the adhesive sheet to adhere the adherend-adhered surface of the adhesive sheet and the adherend). By compressing the gas existing between them, the adhesive layer through-hole in the closed state is reopened so that the gas can be discharged from the adhesive layer through-hole to the back side of the adhesive sheet. It is configured. The pressure-sensitive adhesive layer through hole is preferably configured so that the opening is closed again after the gas is discharged in this manner. The technology disclosed herein can be preferably implemented in the form of a pressure-sensitive adhesive sheet having a pressure-sensitive adhesive layer through-hole that can be reversibly opened and closed.

  In the pressure-sensitive adhesive sheet disclosed herein, the pressure-sensitive adhesive layer through-holes are preferably arranged regularly and repeatedly. Such a pressure-sensitive adhesive sheet can give a person who sees the impression that the appearance is controlled as a pattern while obtaining desired gas release properties. This is practically significant in that it provides a psychological effect of reducing the uncomfortable appearance change caused by the formation of the through hole.

  In the pressure-sensitive adhesive sheet disclosed herein, the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer is preferably crosslinked. The pressure-sensitive adhesive layer through-hole formed by piercing the cross-linked pressure-sensitive adhesive is easy to reopen even if the opening is once closed. Therefore, it is possible to realize good gas escape properties by using the pressure-sensitive adhesive layer through-hole.

  As an adhesive which comprises the said adhesive layer, an acrylic adhesive can be employ | adopted preferably. In general, acrylic adhesives are less self-adhering than rubber adhesives. The through-hole formed in the pressure-sensitive adhesive layer having low self-adhesiveness is easily reopened even if the opening is once closed. This is preferable from the viewpoint of degassing property of the pressure-sensitive adhesive sheet.

According to this specification, the manufacturing method of the adhesive sheet which has an adhesive layer is also provided. The method includes forming the pressure-sensitive adhesive layer. Moreover, it includes forming a through-hole penetrating the pressure-sensitive adhesive layer from the surface of the pressure-sensitive adhesive sheet attached to the adherend to penetrate the pressure-sensitive adhesive layer. According to this manufacturing method, the adhesive sheet which can exhibit the air bleeding function to a thickness direction suitably can be manufactured with sufficient productivity. As an example of the pressure-sensitive adhesive sheet that can be suitably manufactured using the above-described manufacturing method, a pressure-sensitive adhesive sheet in which the size of the through hole on any surface of the pressure-sensitive adhesive layer is 0.5 mm or more can be mentioned. Another example is a pressure-sensitive adhesive sheet having a volume resistance value higher than 1 × 10 ¹ Ω. The above production method can be preferably applied to the production of any pressure-sensitive adhesive sheet disclosed herein, for example.

It is sectional drawing which shows typically the adhesive sheet which concerns on one Embodiment. It is the top view which looked at the adhesive sheet shown in FIG. 1 from the arrow II direction. It is explanatory drawing which shows typically the manufacturing method of the adhesive sheet which concerns on one Embodiment. It is explanatory drawing which shows typically the measuring method of a volume resistance value.

Hereinafter, preferred embodiments of the present invention will be described. Note that matters other than matters specifically mentioned in the present specification and necessary for the implementation of the present invention can be grasped as design matters of those skilled in the art based on the prior art in this field. The present invention can be carried out based on the contents disclosed in this specification and common technical knowledge in the field.
In the following drawings, members / parts having the same action may be described with the same reference numerals, and redundant descriptions may be omitted or simplified. In addition, the embodiment described in the drawings is schematically illustrated for clearly explaining the present invention, and does not necessarily accurately represent the size and scale of the pressure-sensitive adhesive sheet of the present invention that is actually provided as a product. .

<Configuration of adhesive sheet>
The pressure-sensitive adhesive sheet disclosed herein includes a pressure-sensitive adhesive layer. In the pressure-sensitive adhesive layer, a plurality of through-holes penetrating through the pressure-sensitive adhesive layer (typically penetrating in the thickness direction) are typically formed. The said adhesive sheet may be a form which further contains the support base material which supports the said adhesive layer. Or the form (baseless form) which does not contain such a support base material but consists only of an adhesive layer may be sufficient.

One embodiment of the pressure-sensitive adhesive sheet disclosed herein will be described with reference to FIGS. 1 and 2.
As shown in FIG. 1, the adhesive sheet 1 which concerns on this embodiment is equipped with the adhesive layer 10 and the sheet-like support base material 20 which supports this. One surface (front surface) 20A of the support substrate 20 is a non-peelable surface (non-peel surface), and the pressure-sensitive adhesive layer 10 is disposed thereon. The other surface (back surface) 20 </ b> B of the support base material 20 constitutes the back surface 1 </ b> B of the pressure-sensitive adhesive sheet 1. One surface (front surface) 10 </ b> A of the pressure-sensitive adhesive layer 10 constitutes an adherend attaching surface 1 </ b> A of the pressure-sensitive adhesive sheet 1. The pressure-sensitive adhesive sheet 1 is typically used by being attached to an adherend by pressing the adherend-attaching surface 1A to the adherend.

  The pressure-sensitive adhesive layer 10 has a plurality of pressure-sensitive adhesive layer through-holes 12 penetrating the pressure-sensitive adhesive layer. FIG. 1 shows one of them, and FIG. 2 shows five of them. The pressure-sensitive adhesive layer through-hole 12 is in an open state (open state) in the pressure-sensitive adhesive sheet 1 or is closed so as to be reopenable by the gas pressure from the adherend attaching surface 1A side. The support base material 20 has a configuration in which a plurality of base material through holes 22 penetrating the support base material 20 are formed in a non-breathable resin sheet such as polyethylene terephthalate (PET). The base material through hole 22 is formed at a position corresponding to the pressure-sensitive adhesive layer through hole 12. Specifically, the base material through hole 22 is formed at a position at least partially overlapping with the pressure sensitive adhesive layer through hole 12 in a plan view of the pressure sensitive adhesive sheet 1. The pressure-sensitive adhesive sheet 1 is formed so that the gas on the adherend pasting surface 1A side can be discharged to the back surface 1B side through the pressure-sensitive adhesive layer through-hole 12 and the substrate through-hole 22.

  The adhesive layer through-hole 12 and the substrate through-hole 22 are formed on the pressure-sensitive adhesive sheet 1 with the protrusion 52 of the through-hole forming device 50, preferably from the adherend attaching surface 1A side, as indicated by phantom lines in FIG. It can be suitably formed by piercing.

  For example, as shown in FIG. 3, a support base material 20 made of a non-breathable resin sheet having no through-holes, and a pressure-sensitive adhesive layer 10 provided as a non-porous continuous film on one surface 20A thereof. A pressure-sensitive adhesive sheet 1 is prepared or obtained. Using the through-hole forming device 50 having a plurality of protrusions 52, the protrusions 52 are pierced into the pressure-sensitive adhesive layer 10 from the adherend attaching surface 1A side of the pressure-sensitive adhesive sheet 1. When the support base material 20 is a non-breathable resin sheet as in this embodiment, the protrusion 52 may be pierced so that the tip 52A penetrates to the back surface 1B of the support base material 20 (see FIG. 1). Thereby, the adhesive layer through-hole 12 and the base material through-hole 22 can be formed.

  Thereafter, when the protrusion 52 that has pierced the adhesive sheet 1 is removed, the adhesive that has been deformed around the protrusion 52 tends to recover to its original shape, as shown in FIG. As a result, the pressure-sensitive adhesive layer through-hole 12 is closed, or at least the opening area thereof is smaller than the cross-sectional area of the protrusion 52 pierced by the pressure-sensitive adhesive layer 10. As a result, the effective area of the pressure-sensitive adhesive layer 10 (the area that contributes to the pressure-sensitive adhesive performance) increases, so that the pressure-sensitive adhesive performance can be improved. Moreover, since the adhesive layer through-hole 12 becomes less conspicuous, the appearance quality of the adhesive sheet 1 is improved.

  According to the pressure-sensitive adhesive sheet 1 having such a configuration, the gas on the adherend pasting surface 1A side of the pressure-sensitive adhesive sheet 1 is transferred to the back surface 1B of the pressure-sensitive adhesive sheet 1 via the pressure-sensitive adhesive layer through hole 12 and the substrate through hole 22. Can be pulled out to the side. Utilizing such a function, the air remaining between the adherend pasting surface 1A and the adherend surface during the pasting operation of the pressure sensitive adhesive sheet 1 or the pressure sensitive adhesive layer 10 and the adherend after the pressure sensitive adhesive sheet 1 is pasted Gas (air, solvent vapor, water vapor, etc.) generated from the body and accumulated between the adherend pasting surface 1A and the adherend surface can be discharged in the thickness direction of the pressure-sensitive adhesive sheet 1. As a result, it is possible to avoid a decrease in adhesive force due to the gas and realize a good bonding state with the adherend.

  In the present embodiment, the pressure-sensitive adhesive layer through-hole 12 is formed by deforming the pressure-sensitive adhesive by cutting the protrusion 52 into the pressure-sensitive adhesive layer 10 as described above (cutting the pressure-sensitive adhesive layer 10). Therefore, for example, a partial region of the pressure-sensitive adhesive sheet 1 is eliminated by thermal processing such as laser processing and a through-hole is formed, or a partial region of the pressure-sensitive adhesive sheet 1 is removed (cut out) by punching such as pressing. Unlike the embodiment in which the through hole is formed, the pressure-sensitive adhesive layer through-hole 12 can be formed without substantially reducing the amount of the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer 10. This is advantageous from the viewpoint of adhesive performance. Moreover, it is preferable also in the point that processing residues, such as a thermal decomposition thing and punching waste of the adhesive sheet 1, are hard to produce. Furthermore, it is more advantageous in terms of productivity and energy cost than the mode of forming a through hole by eliminating a part of the adhesive sheet by thermal processing such as laser processing, and prevents thermal deterioration and contamination of the adhesive sheet. It is also excellent in that it can.

  Further, as described above, since the adhesive is a viscoelastic body, when the protrusion 52 pierced by the adhesive layer 10 is removed, the adhesive deformed by the protrusion 52 attempts to recover to its original shape. To do. As a result, the pressure-sensitive adhesive sheet 1 disclosed herein is in a state where the opening of the pressure-sensitive adhesive layer through-hole 12 is closed or at least the area of the opening is smaller than the cross-sectional area of the protrusion 52. This increases the effective area of the pressure-sensitive adhesive layer 10. Further, the pressure-sensitive adhesive layer through-hole 12 is less noticeable on the appearance of the pressure-sensitive adhesive sheet 1. Closing the opening of the pressure-sensitive adhesive layer through-hole 12 or reducing the opening area thereof is also preferable from the viewpoint of suppressing entry of foreign matters such as water from the back surface of the pressure-sensitive adhesive sheet 1 through the pressure-sensitive adhesive layer through-hole 12.

  When the protrusion 52 is pierced into the pressure-sensitive adhesive sheet 1 in order to form the pressure-sensitive adhesive layer through-hole 12, the temperature of the protrusion 52 may be set so that the effect of the present invention is not significantly impaired, and is not particularly limited. When the protrusions 52 are used by heating, the temperature is suitably 120 ° C. or lower, for example, and from the viewpoint of preventing thermal deterioration of the pressure-sensitive adhesive sheet 1, it is usually preferably 90 ° C. or lower. It is more preferable that the temperature be not higher than ° C. From the viewpoint of energy cost and production controllability, it is possible to preferably adopt a mode in which the temperature of the protrusion 52 is not specifically controlled. In this case, the temperature of the pressure-sensitive adhesive sheet 1 at the time of forming the pressure-sensitive adhesive layer through-hole 12 can usually be maintained around room temperature (typically about 10 ° C. to 40 ° C.).

  In the adhesive layer 10, the portion where the adhesive layer through-hole 12 is formed has a cut in the adhesive layer 10 due to the protrusion 52 being pierced. Even when closed, the adhesive layer 10 is still weaker than the other portions. By utilizing this, the pressure-sensitive adhesive layer through-hole 12 is reopened (reopened) by the pressure of the gas accumulated between the pressure-sensitive adhesive layer 10 and the adherend, and the pressure-sensitive adhesive sheet passes through the pressure-sensitive adhesive layer through-hole 12. The gas can be extracted to the back surface 1B side of 1.

  The size of the pressure-sensitive adhesive layer through-hole 12 can be, for example, more than 0.3 mm in at least one of the front surface 10A and the back surface 10B of the pressure-sensitive adhesive layer 10, and is usually suitably 0.4 mm or more. From the viewpoint of outgassing properties, the size of the pressure-sensitive adhesive layer through-hole 12 is preferably 0.5 mm or more, and more preferably 0.7 mm or more (for example, 1 mm or more). If the size of the pressure-sensitive adhesive layer through-hole 12 is too small, it tends to be difficult to reopen the pressure-sensitive adhesive layer through-hole 12 using the gas pressure as described above. From this viewpoint, it is preferable that the size of the pressure-sensitive adhesive layer through hole 12 at least on the surface (front surface) 10A of the pressure-sensitive adhesive layer 10 is 0.5 mm or more.

The upper limit of the size of the pressure-sensitive adhesive layer through-hole 12 is not particularly limited, but considering the ease of forming the pressure-sensitive adhesive layer through-hole 12, the protective property, etc., it is usually suitably 20 mm or less, and 10 mm or less ( For example, it is preferably 5 mm or less.
The size of the pressure-sensitive adhesive layer through-hole 12 in the front surface 10A of the pressure-sensitive adhesive layer 10 refers to the maximum length of the pressure-sensitive adhesive layer through-hole 12 in the front surface 10A. In the example shown in FIG. 2, the length L of the linear pressure-sensitive adhesive layer through-hole 12 on the front surface 10A of the pressure-sensitive adhesive layer 10 corresponds to the size of the pressure-sensitive adhesive layer through-hole 12 on the front surface 10A.

  The shape of the protrusion 52 is preferably designed so that even if the protrusion 52 is pierced, the adhesive sheet 1 is not partially cut out and removed. Typically, the protrusion 52 can be grasped as a needle or a blade that cuts the pressure-sensitive adhesive layer 10 by being pierced into the pressure-sensitive adhesive layer 10. The shape of the protrusion 52 viewed from the tip 52A side is not particularly limited. For example, it may be a round shape such as a circle or an ellipse; a polygonal shape such as an isosceles triangle or a rectangle; a linear shape such as a straight line, a curved line, a broken line, or a cross; When it is desired to keep the pressure-sensitive adhesive layer through-hole closed except during gas discharge, the protrusion 52 having a non-circular cross-sectional shape is advantageous.

In a preferred embodiment, the shape of the pressure-sensitive adhesive layer through-hole 12 on the adherend pasting surface 1A can be a shape including a linear portion as illustrated in FIG. Thus, the pressure-sensitive adhesive layer through-hole 12 including a linear portion can easily suppress the influence on the adhesive performance even if the length of the linear portion is relatively large. Moreover, since the adhesive layer through-hole 12 having such a shape tends to be re-opened from the closed shape, it is preferable from the viewpoint of outgassing properties.
Here, the term “linear” typically refers to an open line shape, and includes a linear shape, a curved shape, a broken line shape, a cross shape, and the like. For example, the shape of the pressure-sensitive adhesive layer through-hole 12 on the adherend pasting surface 1A is a shape including a linear portion having a length of 0.5 mm or more (more preferably 0.7 mm or more, for example, 1 mm or more). preferable. The upper limit in particular of the length of the said linear part is not restrict | limited, For example, it can be 20 mm or less. The pressure-sensitive adhesive layer through-hole 12 having a length L of 0.5 mm or more and 10 mm or less shown in FIG. 2 is a form in which the shape of the pressure-sensitive adhesive layer through-hole 12 on the adherend-adhering surface 1A includes a linear portion. This is a preferred example.

  As shown in FIG. 3, the front surface 10 </ b> A of the pressure-sensitive adhesive layer 10 (covered surface) is generally compared with the case where the protrusion 52 is pierced from the back surface 1 </ b> B side by piercing the protrusion 52 from the adherend attachment surface 1 </ b> A side of the adhesive sheet 1. The size of the pressure-sensitive adhesive layer through-hole 12 on the adherend pasting surface 1A) is increased. Thereby, the gas which can exist between the adhesive layer 10 and a to-be-adhered body can be efficiently guide | induced to the adhesive layer through-hole 12. FIG. Further, when the size of the pressure-sensitive adhesive layer through-hole 12 in the front surface 10A is increased, the pressure-sensitive adhesive layer through-hole 12 in a closed state can be easily reopened by using the gas pressure on the front surface 10A side, and the gas release property is improved. It tends to improve. By sticking the protrusion 52 from the adherend attaching surface 1A side of the pressure-sensitive adhesive sheet 1, the pressure-sensitive adhesive layer through-hole 12 having a desired size is formed, and the size of the base material through-hole 22 on the back surface 1B of the pressure-sensitive adhesive sheet 1 is set. Can be small. This is advantageous in terms of appearance of the back surface 1B of the pressure-sensitive adhesive sheet 1. Moreover, since it is easy to suppress intrusion of air and water from the back surface 1B, the protective property of the adhesive layer 10 and the adherend is good.

  In addition, the size of the base material through-hole 22 in the back surface 1B of the adhesive sheet 1 is not specifically limited, For example, it can be 0.5 micrometer or more. From the viewpoint of obtaining good outgassing properties, usually, the size of the substrate through-hole 22 is suitably 5 μm or more, and preferably 10 μm or more. The upper limit of the size of the base material through-hole 22 in the back surface 1B is not particularly limited. However, in consideration of the strength of the support base material 20 and the appearance of the pressure-sensitive adhesive sheet 1, it is usually suitably 15 mm or less and less than 10 mm ( For example, it is preferable to be less than 5 mm. The shape of the base material through-hole 22 may be a shape that substantially corresponds to the cross-sectional shape of the protrusion 52 described above, for example.

  The operation of piercing the protrusion 52 into the pressure-sensitive adhesive sheet 1 can be preferably performed in a state where the release liner 30 is disposed on the front surface 10A of the pressure-sensitive adhesive layer 10 to protect the pressure-sensitive adhesive layer 10 as shown in FIG. Here, in the release liner 30, at least a surface (front surface) 30 </ b> A on the side disposed on the front surface 10 </ b> A of the pressure-sensitive adhesive layer 10 is a surface (peeling surface) having releasability. The protrusion 52 can be pierced into the pressure-sensitive adhesive sheet 1 through the release liner 30. The release liner 30 thus formed with the through-holes may be subsequently used for protecting the pressure-sensitive adhesive layer 10, or the release liner is peeled off and another release liner (typically having through-holes). The release liner may not be replaced.

  The release liner is not particularly limited. For example, a release liner having a release treatment layer on the surface of a liner substrate such as a resin film or paper, a fluoropolymer (polytetrafluoroethylene, etc.), a polyolefin resin (polyethylene, A release liner made of a low adhesive material such as polypropylene) can be used. The release treatment layer may be formed, for example, by surface-treating the liner base material with a release treatment agent such as silicone-based, long-chain alkyl-based, fluorine-based, or molybdenum sulfide.

  In addition, the direction which pierces the protrusion 52 in the adhesive sheet 1 is not limited from the adherend pasting surface 1A side, and may be from the back surface 1B side. By piercing the protrusion 52 in this direction, a bulge that can be caused by the protrusion 52 penetrating the support base material 20 is formed on the front surface 20A side instead of the back surface 20B side. Thereby, it exists in the tendency for the smoothness of the back surface 1B of the adhesive sheet 1 to improve.

  The number (formation density) of the pressure-sensitive adhesive layer through-holes 12 existing per area of the pressure-sensitive adhesive sheet 1 is not particularly limited, and can be appropriately set so as to obtain a desired gas releasing property. Moreover, there is no restriction | limiting in particular also in arrangement | positioning of the adhesive layer through-hole 12 in the planar view of the adhesive sheet 1, and the base-material through-hole 22 corresponding to this. From the viewpoint of obtaining uniform adhesive performance and gas escape performance in each part of the pressure-sensitive adhesive sheet 1, it is usually preferable that the pressure-sensitive adhesive layer through-holes 12 are arranged uniformly (with no unevenness). This is also preferable from the viewpoint of the beauty of the pressure-sensitive adhesive sheet 1. The arrangement of the pressure-sensitive adhesive layer through-holes 12 may be regular or random. According to the configuration in which the pressure-sensitive adhesive layer through-holes 12 are regularly arranged, it is possible to give a person who sees the impression that the appearance is controlled while obtaining desired air detachability. This is practically significant in that it has a psychological effect of preventing and reducing the discomfort of the appearance change due to the formation of the through hole.

The volume resistance value of the pressure-sensitive adhesive sheet 1 is typically a value exceeding 1 × 10 ¹ Ω, preferably 1 × 10 ³ Ω or more, more preferably 1 × 10 ⁶ Ω or more, and further preferably 1 × 10 ^9. Ω or more, particularly preferably 1 × 10 ¹² Ω or more. Such a pressure-sensitive adhesive sheet can be suitably used as a pressure-sensitive adhesive sheet for applications requiring low conductivity or non-conductivity. An example of such an application is an adhesive tape for electrical insulation. The volume resistance value is measured as follows.

[Volume resistance value]
From the pressure-sensitive adhesive sheet, a pressure-sensitive adhesive sheet piece having a size of width 10 mm × length 100 mm is cut out, the separator is peeled off, and the test piece 123 having the pressure-sensitive adhesive surface exposed is obtained.
Next, as shown in FIG. 4, copper foil 122 (size: width 10 mm × length 100 mm, thickness 35 μm) on a glass plate 121 (soda lime glass, size: width 80 mm × length 80 mm, thickness 3.2 mm). ) Is fixed, and the test piece 123 obtained above is pasted on the copper foil 122 and the glass plate 121. Next, the test piece 123 is pressure-bonded by reciprocating a 2 kg roller, and this is used as a test sample (contact area between the copper foil 122 and the test piece 123: 100 mm ² ).
After the test sample is allowed to stand at room temperature (23 ° C., 50% RH atmosphere) for at least 12 hours, a DC power source 124, a DC ammeter 125, a DC voltmeter 126, and lead wires 127a and 127b are connected as shown in FIG. Then, the circuit is assembled, the resistance value (volume resistance) is measured, and this is set as the “volume resistance value”. The resistance value (Ω) is calculated by dividing the voltage value (V) read by the DC voltmeter 126 by the current value (A) read by the DC ammeter 125.

  The pressure-sensitive adhesive sheet 1 shown in FIGS. 1 to 3 is in the form of a single-sided pressure-sensitive adhesive sheet with a base material having a pressure-sensitive adhesive layer 10 on one side of the support base material 20, and the support base material 20 is a non-breathable resin sheet. Although the thing in which the base-material through-hole 22 was formed in multiple is used, the form of the adhesive sheet disclosed here is not limited to this.

  For example, the technology disclosed herein has a pressure-sensitive adhesive layer on one side of a breathable support substrate such as a nonwoven fabric or woven fabric, and a plurality of pressure-sensitive adhesive layer through holes are formed in the pressure-sensitive adhesive layer. It can also be implemented in the form of a single-sided pressure-sensitive adhesive sheet with a base material. Thus, in the adhesive sheet provided with a breathable support substrate, the substrate through-hole 22 in the adhesive sheet 1 shown in FIG. 1 can be omitted. Therefore, for example, when a protrusion is pierced from the front surface (surface opposite to the support base) of the pressure-sensitive adhesive layer to form a pressure-sensitive adhesive layer through-hole, the above-mentioned tip does not have to be penetrated to the back surface of the pressure-sensitive adhesive sheet. According to such an aspect, even if the pressure-sensitive adhesive layer through-hole is formed, it is easy to keep the back surface of the pressure-sensitive adhesive sheet smooth, and it is possible to prevent the appearance of the pressure-sensitive adhesive sheet from feeling uncomfortable. Alternatively, in order to obtain higher air permeability, base material through holes may be further formed in the air-permeable support base material.

  Moreover, the technique disclosed here can be implemented with the form of the double-sided adhesive sheet with a base material in which the 1st adhesive layer and the 2nd adhesive layer were each provided in both surfaces of the support base material, for example. In the double-sided pressure-sensitive adhesive sheet with a base material according to a preferred embodiment, a plurality of through-holes penetrating the first pressure-sensitive adhesive layer, the supporting base material and the second pressure-sensitive adhesive layer are formed. The said through-hole can be preferably formed by piercing a protrusion so that it may penetrate the said double-sided adhesive sheet with a base material in the thickness direction. The support substrate may be a breathable support substrate such as a nonwoven fabric or a non-breathable support substrate such as a resin sheet.

  Moreover, the technique disclosed here can be implemented with the form of the double-sided adhesive sheet (base-material-less double-sided adhesive sheet) which consists of an adhesive layer which does not have a support base material, for example. The base material-less double-sided pressure-sensitive adhesive sheet according to a preferred embodiment has a plurality of through-holes that penetrate the pressure-sensitive adhesive layer constituting the double-sided pressure-sensitive adhesive sheet in the thickness direction. The through-hole can be preferably formed by piercing the pressure-sensitive adhesive layer with a protrusion so as to penetrate the pressure-sensitive adhesive layer in the thickness direction.

<Adhesive layer>
The pressure-sensitive adhesive layer disclosed herein typically exhibits a soft solid (viscoelastic body) state in a temperature range near room temperature, and is a material (pressure-sensitive adhesive) that has a property of easily adhering to an adherend by pressure. ). The adhesive here is generally defined as “CA Dahlquist,“ Adhesion: Fundamental and Practice ”, McLaren & Sons, (1966) P. 143”, and generally has a complex tensile modulus E ^* (1 Hz). <10 < ⁷ > dyne / cm < ² > material (typically a material having the above properties at 25 [deg.] C.).

  The pressure-sensitive adhesive layer disclosed herein may be a pressure-sensitive adhesive layer formed from a pressure-sensitive adhesive composition such as an aqueous, solvent-type, hot-melt type, or active energy ray-curable type. The water-based pressure-sensitive adhesive composition refers to a pressure-sensitive adhesive composition in a form containing a pressure-sensitive adhesive (pressure-sensitive adhesive layer forming component) in a water-based solvent (water-based solvent), and is typically dispersed in water. What is called a type pressure-sensitive adhesive composition (a composition in which at least a part of the pressure-sensitive adhesive is dispersed in water) and the like are included. Moreover, a solvent-type adhesive composition means the adhesive composition of the form which contains an adhesive in an organic solvent. A water-based pressure-sensitive adhesive composition is preferable from the viewpoint of reducing environmental burden, and a solvent-type pressure-sensitive adhesive composition is preferably used from the viewpoint of adhesive properties and the like.

  In the technology disclosed herein, the type of pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer is not particularly limited, and is known in the field of pressure-sensitive adhesives, such as acrylic polymers, rubber polymers, polyester polymers, urethane polymers, and polyether systems. The base polymer may include one or more of various rubber-like polymers such as polymers, silicone-based polymers, polyamide-based polymers, and fluorine-based polymers. From the viewpoint of adhesive performance and cost, an adhesive containing an acrylic polymer or a rubber polymer as a base polymer can be preferably used.

The “base polymer” of the pressure-sensitive adhesive refers to the main component of the rubbery polymer contained in the pressure-sensitive adhesive. The rubbery polymer refers to a polymer that exhibits rubber elasticity in a temperature range near room temperature. Further, in this specification, “main component” refers to a component contained in an amount exceeding 50% by weight unless otherwise specified.
The “acrylic polymer” refers to a polymer containing monomer units derived from a monomer having at least one (meth) acryloyl group in one molecule as monomer units constituting the polymer. Hereinafter, a monomer having at least one (meth) acryloyl group in one molecule is also referred to as an “acrylic monomer”. A typical example of the acrylic polymer is an acrylic polymer in which the proportion of the acrylic monomer in all monomer components used for the synthesis of the acrylic polymer is more than 50% by weight.
The term “(meth) acryloyl” means acryloyl and methacryloyl comprehensively. Similarly, “(meth) acrylate” means acrylate and methacrylate, and “(meth) acryl” generically means acrylic and methacryl.

Of these, an adhesive (acrylic adhesive) having an acrylic polymer as a base polymer is preferable. In general, acrylic polymers are less self-adhering than rubber polymers. Therefore, the pressure-sensitive adhesive layer containing the acrylic pressure-sensitive adhesive as a base polymer has an advantage that it is easy to reopen the pressure-sensitive adhesive layer through-hole in a closed state.
As the acrylic polymer, for example, a polymer of a monomer raw material that includes alkyl (meth) acrylate as a main monomer and can further include a submonomer copolymerizable with the main monomer is preferable. Here, the main monomer means a component occupying more than 50% by weight of the monomer composition in the monomer raw material.

As the alkyl (meth) acrylate, for example, a compound represented by the following formula (1) can be preferably used.
CH ₂ = C (R ¹ ) COOR ² (1)
Here, R ¹ in the above formula (1) is a hydrogen atom or a methyl group. R ² is a chain alkyl group having 1 to 20 carbon atoms (hereinafter, such a range of the number of carbon atoms may be represented as “C _1-20 ”). From the viewpoint of storage elastic modulus of the pressure-sensitive adhesive, an alkyl (meth) acrylate in which R ² is a chain alkyl group of C _1-12 (eg, C _2-10 , typically C _4-8 ) is preferable. . The alkyl (meth) acrylate in which R ² is a C _1-20 chain alkyl group can be used alone or in combination of two or more. Preferred alkyl (meth) acrylates include n-butyl acrylate and 2-ethylhexyl acrylate.

  A submonomer having copolymerizability with the main monomer, alkyl (meth) acrylate, can be useful for introducing a crosslinking point into the acrylic polymer or increasing the cohesive strength of the acrylic polymer. As a submonomer, for example, one or two functional group-containing monomers such as a carboxy group-containing monomer, a hydroxyl group-containing monomer, an acid anhydride group-containing monomer, an amide group-containing monomer, an amino group-containing monomer, and a monomer having a nitrogen atom-containing ring The above can be used. The secondary monomer may also be a vinyl ester monomer such as vinyl acetate, an aromatic vinyl compound such as styrene, a sulfonic acid group-containing monomer, a phosphoric acid group-containing monomer, and the like. For example, from the viewpoint of improving cohesive strength, an acrylic polymer obtained by copolymerizing a carboxy group-containing monomer and a hydroxyl group-containing monomer as the submonomer is preferable. Preferable examples of the carboxy group-containing monomer include acrylic acid and methacrylic acid. Preferable examples of the hydroxyl group-containing monomer include 2-hydroxyethyl acrylate and 4-hydroxybutyl acrylate.

  The method for obtaining the acrylic polymer is not particularly limited, and various polymerization methods known as synthetic methods for acrylic polymers, such as solution polymerization, emulsion polymerization, bulk polymerization, and suspension polymerization, are appropriately employed. be able to. For example, a monomer mixture is dissolved or dispersed in an appropriate polymerization solvent (toluene, ethyl acetate, water, etc.), and a polymerization operation is performed using a polymerization initiator such as an azo polymerization initiator or a peroxide initiator. Thus, a desired acrylic polymer can be obtained.

  In addition to the base polymer, the pressure-sensitive adhesive composition includes a cross-linking agent, a cross-linking aid, a tackifier such as a rosin resin, a leveling agent, a plasticizer, a softening agent, a filler, an antistatic agent, and aging as necessary. It may contain various additives generally used in the field of pressure-sensitive adhesive compositions, such as an inhibitor, an ultraviolet absorber, an antioxidant, and a light stabilizer. About such various additives, a conventionally well-known thing should just be used by a conventional method.

  In the technology disclosed herein, the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer is preferably crosslinked. By appropriately crosslinking the pressure-sensitive adhesive, it is possible to improve the ability to recover deformation of the pressure-sensitive adhesive layer caused by piercing the protrusions. Thereby, even if a relatively large pressure-sensitive adhesive layer through-hole is formed, the pressure-sensitive adhesive layer through-hole tends to be inconspicuous in appearance. Moreover, the cross-linked pressure-sensitive adhesive tends to suppress self-adhesiveness compared to the non-cross-linked pressure-sensitive adhesive. Therefore, it is easy to reopen the adhesive layer through-hole once closed.

  The kind in particular of a crosslinking agent is not restrict | limited, It can select from a conventionally well-known crosslinking agent suitably and can be used. Examples of such a crosslinking agent include an isocyanate crosslinking agent, an epoxy crosslinking agent, an oxazoline crosslinking agent, and a carbodiimide crosslinking agent. A crosslinking agent can be used individually by 1 type or in combination of 2 or more types. Preferable examples include isocyanate crosslinking agents and epoxy crosslinking agents. You may use it combining an isocyanate type crosslinking agent and an epoxy type crosslinking agent. The usage-amount of a crosslinking agent can be set so that a suitable crosslinked state may be implement | achieved in an adhesive layer, and is not specifically limited.

  The thickness of the pressure-sensitive adhesive layer disclosed herein is not particularly limited and can be appropriately selected depending on the purpose. Usually, about 3 to 200 μm (for example, 5 to 100 μm, typically 10 to 50 μm) is appropriate from the viewpoint of productivity such as drying efficiency and adhesive properties. Limiting the thickness of the pressure-sensitive adhesive layer is advantageous in terms of reducing the thickness of the pressure-sensitive adhesive sheet, reducing the size, reducing the weight, and saving resources. When the technique disclosed here is implemented in the form of a double-sided pressure-sensitive adhesive sheet having pressure-sensitive adhesive layers on both sides of the substrate, the thickness of each pressure-sensitive adhesive layer may be the same or different.

<Support base material>
When the technology disclosed herein is implemented in the form of a double-sided pressure-sensitive adhesive sheet with a base material or a single-sided pressure-sensitive adhesive sheet with a base material, examples of the supporting base material include resin sheets, paper, cloth, rubber sheets, foam sheets, and metals. A foil, a composite or laminate of these can be used. Especially, it is preferable that a resin sheet layer is included from a viewpoint of sticking property and sheet | seat external appearance property (for example, appearance of a sheet | seat outer surface). The inclusion of the resin sheet layer is advantageous from the viewpoints of dimensional stability, thickness accuracy, workability, tensile strength, and the like. Preferable examples of the resin sheet include polyolefin resin sheets such as polyethylene and polypropylene; polyester resin sheets such as polyethylene terephthalate (PET) and polybutylene terephthalate. Among the resin sheets, a polyester sheet is more preferable, and a PET sheet is particularly preferable among them. The support substrate may have a single layer structure or may have a multilayer structure of two layers or three or more layers.

  A pressure-sensitive adhesive sheet according to a preferred embodiment includes a support base material that is non-breathable and has a plurality of through holes penetrating the base material. As a result, even when air accumulation occurs between the adhesive layer and the adherend, air is discharged in the thickness direction of the adhesive sheet, eliminating the air accumulation and realizing a good bonding state. can do. And since the said base material is non-breathable in parts other than the through-hole of this base material, the adhesive layer and to-be-adhered body protection are good. In this specification, “non-breathable” means that the air permeability obtained from the time required for 100 mL of air to pass exceeds 30 seconds (/ 100 mL). The air permeability is measured according to the Gurley tester method specified in JIS P8117: 1998. The air permeability of the support substrate is preferably 70 seconds / 100 mL or more (for example, 100 seconds / 100 mL or more).

  For supporting substrates (for example, resin sheets), fillers (inorganic fillers, organic fillers, etc.), anti-aging agents, antioxidants, ultraviolet absorbers, antistatic agents, lubricants, plasticizers, etc., as necessary These various additives may be blended.

  The support substrate (for example, a resin sheet) may be colored black, white, or other colors by including various colorants (for example, pigments) in order to impart desired designability and optical properties. Moreover, you may employ | adopt the method of laminating | stacking 1 layer or 2 layers or more of colored layers (for example, a black layer or a white layer) by printing etc. on at least one surface (one side or both surfaces) of a support base material.

  The back surface of the support substrate (the surface opposite to the surface on which the pressure-sensitive adhesive layer is provided) is subjected to a release treatment with a release treatment agent such as silicone, long-chain alkyl, or fluorine as necessary. May be. On the other hand, for the purpose of improving the adhesion between the support substrate and the pressure-sensitive adhesive layer, the surface of the support substrate on the side of the pressure-sensitive adhesive layer is a conventionally known surface treatment such as corona discharge treatment or primer coating. May be given.

  The thickness of the supporting substrate is not particularly limited and can be appropriately selected depending on the purpose. In general, the thickness is suitably about 5 to 500 μm (preferably 10 to 200 μm, typically 15 to 100 μm, for example 15 to 50 μm). Limiting the thickness of the supporting substrate is advantageous in terms of reducing the thickness, reducing the size, reducing the weight, and saving resources of the pressure-sensitive adhesive sheet.

  The total thickness of the pressure-sensitive adhesive sheet disclosed here (including the pressure-sensitive adhesive layer and the supporting substrate, but not including the release liner) is not particularly limited, and is approximately 10 to 1000 μm (for example, 10 to 300 μm, typically Is suitably in the range of 15-100 μm. The pressure-sensitive adhesive sheet having a limited total thickness can be advantageous in terms of reducing the size, weight, and resource saving of the product to which the pressure-sensitive adhesive sheet is applied.

<Application>
As described above, the pressure-sensitive adhesive sheet disclosed herein can highly prevent air accumulation and the like from occurring between the pressure-sensitive adhesive layer and the adherend when being attached to the adherend. . Therefore, in any pasting method of manual pasting (hand pasting) or pasting (automatic pasting) using an automatic pasting machine or the like, the pasting property is improved. For example, in the case of pasting by hand, the dependence on the individual skill can be reduced, so that advantages such as improvement and stabilization of pasting efficiency and pasting quality can be obtained. In addition, when pasting by automatic pasting, it is possible to realize a reduction in pasting failure due to air remaining between the pressure-sensitive adhesive layer and the adherend and a reduction in the pasting work. Therefore, in both cases of manual pasting and automatic pasting, it becomes possible to improve the pasting efficiency and quality, stabilize the quality, etc., and thereby the productivity and quality of articles constructed using adhesive sheets Will also improve. Especially, the effect of applying the technique disclosed here is notably demonstrated with respect to the aspect affixed using an automatic sticking machine.

  In addition, there may be a case where air clogging or the like occurs between the pressure-sensitive adhesive sheet and the adherend as time passes, not only at the time of pasting, but also after pasting. Typically, when the adhesive sheet is pasted and stored or used in a relatively high temperature (for example, 35 ° C. or higher) environment, the above-mentioned air pocket or the like is present between the adhesive sheet and the adherend. May occur and may cause deterioration in appearance. For example, the inside of a factory in summer, the outdoors, the inside of an electronic device, and the like are likely to be in a high temperature state as described above. According to the technology disclosed herein, even when used in applications exposed to the high temperature environment as described above, it prevents the occurrence of air accumulation between the pressure-sensitive adhesive sheet and the adherend and reduces the appearance. It can be prevented for a long time.

  The pressure-sensitive adhesive sheet disclosed herein can be preferably used for applications to be applied to the surface of various articles by taking advantage of the above-described features. In a preferred embodiment, it can be used as various decorative sheets, surface protective sheets, fixing sheets for printing plates such as flexographic printing, light shielding sheets, and the like. For example, it is suitable as a decorative sheet (typically a paint substitute sheet) that is affixed to the exterior of a vehicle, a housing building material, or the like. In addition, it is also suitable as a covering sheet used for the purpose of improving the smoothness of the outer surface of the chassis and for covering non-uniform portions such as screw holes on the surfaces of various members inside an electronic device such as a television. By using such a covering sheet, it is possible to reduce the appearance unevenness on the adherend surface and make the dimensional accuracy uniform. Moreover, it can be preferably used as an exterior sheet of a battery pack in which appearance is important.

  Moreover, even if it is a case where the adhesive sheet disclosed here is comprised thinly, it is possible to maintain a favorable adhesive characteristic, preventing the fall of the external appearance quality after sticking. Therefore, it can be preferably applied to applications (for example, portable electronic devices) where reduction in thickness and weight is required and resource saving is desired. Specifically, a surface protective sheet for a portable electronic device (for example, a mobile phone, a smartphone, a tablet computer, a notebook computer, etc.), a bonding and fixing application in a liquid crystal display device of the portable electronic device, a display unit of the portable electronic device It can be preferably applied to a protection panel (lens) fixing application to be protected, a key module member fixing application of a cellular phone, and the like. When used in the portable electronic device, the pressure-sensitive adhesive sheet may have a frame shape (frame shape), a band shape (strip shape), or the like depending on the purpose or the like. In this specification, “portable” means that it is not sufficient to be able to carry it alone, but to have a portability that allows an individual (standard adult) to carry it relatively easily. Shall mean. In addition, the “lens” in the present specification is a concept including both a transparent body showing a light refraction action and a transparent body having no light refraction action.

  Specific examples of the present invention have been described in detail above, but these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above.

DESCRIPTION OF SYMBOLS 1 Adhesive sheet 1A Adhering body sticking surface 1B Rear surface 10 Adhesive layer 10A Front surface 10B Rear surface 12 Adhesive layer through-hole 20 Support base material 20A Front surface 20B Rear surface 22 Substrate through-hole 30 Release liner 30A Front surface 50 Through-hole forming device Protrusion 52A Tip 121 Glass plate 122 Copper foil 123 Test piece 124 DC power supply 125 DC ammeter 126 DC voltmeter 127a, 127b Conductor

Claims (10)

An adhesive sheet having an adhesive layer,
In the pressure-sensitive adhesive layer, a pressure-sensitive adhesive layer through-hole penetrating the pressure-sensitive adhesive layer is formed,
The pressure-sensitive adhesive layer through-hole is formed by piercing a protrusion into the pressure-sensitive adhesive layer,
The size of the pressure-sensitive adhesive layer through-hole is 0.5 mm or more on any surface of the pressure-sensitive adhesive layer,
The pressure-sensitive adhesive sheet has a volume resistance value higher than 1 × 10 ¹ Ω, and is configured such that gas can be extracted from the adherend-attached surface side of the pressure-sensitive adhesive sheet to the back side of the pressure-sensitive adhesive sheet through the pressure-sensitive adhesive layer through-hole. A pressure-sensitive adhesive sheet.   The pressure-sensitive adhesive sheet according to claim 1, comprising a support substrate that supports the pressure-sensitive adhesive layer. The support substrate is impermeable,
A base material through hole penetrating the support base material is formed in the support base material,
The pressure-sensitive adhesive sheet according to claim 2, wherein the pressure-sensitive adhesive sheet is configured to be capable of extracting gas from the adherend pasting surface side to the back side through the pressure-sensitive adhesive layer through-hole and the base material through-hole. .   The pressure sensitive adhesive sheet according to claim 2 or 3 in which said support substrate contains a resin sheet.   The pressure-sensitive adhesive sheet according to any one of claims 1 to 4, wherein the pressure-sensitive adhesive layer through-hole is formed by piercing the protrusion from the adherend attachment surface side.   The pressure-sensitive adhesive sheet according to any one of claims 1 to 5, wherein the pressure-sensitive adhesive layer through-hole is closed.   The pressure-sensitive adhesive sheet according to any one of claims 1 to 6, wherein the pressure-sensitive adhesive layer through-holes are regularly and repeatedly arranged.   The pressure-sensitive adhesive sheet according to any one of claims 1 to 7, wherein the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer is crosslinked.   The pressure-sensitive adhesive sheet according to any one of claims 1 to 8, wherein the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer is an acrylic pressure-sensitive adhesive. A method for producing an adhesive sheet having an adhesive layer,
The pressure-sensitive adhesive sheet has a volume resistance value higher than 1 × 10 ¹ Ω,
The manufacturing method is:
Forming the pressure-sensitive adhesive layer; and forming a pressure-sensitive adhesive layer through-hole penetrating the pressure-sensitive adhesive layer from the adherend-attached surface side of the pressure-sensitive adhesive sheet and penetrating the pressure-sensitive adhesive layer;
Including
The said adhesive layer through-hole is an adhesive sheet manufacturing method formed so that the formation size in either surface of the said adhesive layer may be 0.5 mm or more.

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