JP2008284801A - Double sided releasing sheet and adhesive sheet roll - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an adhesive sheet roll capable of surely releasing a light releasing layer from an adhesive layer, in advance of releasing a heavy releasing layer from the adhesive layer, and to provide a double sided releasing sheet capable of being formed into such an adhesive rolled sheet. <P>SOLUTION: The double sided releasing sheet 10 comprises a substrate 11, a light releasing layer 12 formed on one side of the substrate 11, and the heavy releasing layer 13 having a larger releasing force than that of the light releasing layer 12 formed on the other side of the substrate 11, and has many protrusions 14a on one face or both faces. The adhesive sheet roll 1 comprises the double sided releasing sheet 10 and an adhesive sheet 1a comprised of an adhesive layer 20 formed on an opposite face of the substrate 11 on the heavy releasing layer 13 of the double sided releasing sheet 10, and the adhesive sheet 1a is rolled. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a double-sided release sheet having release agent layers on both sides of a substrate. Moreover, it is related with the adhesive sheet winding body which has the adhesive sheet for double-sided adhesion in which the adhesive layer was provided in the single side | surface of the double-sided peeling sheet.

When joining two members, a double-sided adhesive sheet in which an adhesive layer is provided on one side of a double-sided release sheet may be used (see Non-Patent Document 1).
Conventionally, as a double-sided release sheet constituting a pressure-sensitive adhesive sheet for double-sided adhesion, a base, a light release layer provided on one side of the base, and a light release layer provided on the other side of the base, What has a heavy peeling layer with a large peeling force is used. If a pressure-sensitive adhesive layer is provided on the surface of such a double-sided release sheet opposite to the substrate of the heavy release layer, a double-sided adhesive sheet can be obtained. Moreover, if such a double-sided release sheet is stored, the type of pressure-sensitive adhesive can be appropriately selected, and a double-sided pressure-sensitive adhesive sheet for different varieties can be produced at any time.

The pressure-sensitive adhesive sheet for double-sided adhesion using the double-sided release sheet is usually a wound body wound so that the pressure-sensitive adhesive layer is on the inner side during storage or transportation.
In the wound body of the pressure-sensitive adhesive sheet, the light release layer is adhered to the pressure-sensitive adhesive layer, but the space between the light release layer and the pressure-sensitive adhesive layer is earlier than between the heavy release layer and the pressure-sensitive adhesive layer. Peel off. Therefore, the pressure-sensitive adhesive sheet is drawn out from the wound body, and the exposed surface of the pressure-sensitive adhesive layer can be attached to one member. Moreover, after removing the double-sided release sheet from the pressure-sensitive adhesive layer, the other surface of the pressure-sensitive adhesive layer is exposed, and the other member is adhered to the exposed surface so that both members can be joined. It has become.
Japan Adhesive Tape Manufacturers Association, Adhesive Handbook Editorial Committee, “Adhesive Handbook”, Japan Adhesive Tape Manufacturers Association, 2nd edition, published on October 12, 1995, p423-424

Generally, since the pressure-sensitive adhesive layer is provided immediately before shipment, the double-sided release sheet is stored as it is wound. However, in the pressure-sensitive adhesive sheet roll using the double-sided release sheet stored for a long time, when trying to feed out the pressure-sensitive adhesive sheet, between the heavy release layer and the pressure-sensitive adhesive layer is more than between the light release layer and the pressure-sensitive adhesive layer. It may have peeled off first. Therefore, only the double-sided release tape is paid out, and the pressure-sensitive adhesive layer may remain on the pressure-sensitive adhesive sheet roll. If the pressure-sensitive adhesive layer remains in the pressure-sensitive adhesive sheet roll, it is difficult to use it as a pressure-sensitive adhesive sheet. Therefore, it was not possible to use a double-sided release sheet stored for a long time in a wound state.
The present invention has been made in view of the above circumstances, and even when stored for a long time in a wound state, the space between the light release layer and the pressure-sensitive adhesive layer is more surely between the heavy release layer and the pressure-sensitive adhesive layer. It aims at providing the double-sided peeling sheet which can obtain the adhesive sheet winding body which peels previously. Moreover, it aims at providing the adhesive sheet winding body which can be reliably made to peel between a light peeling layer and an adhesive layer previously between between a heavy peeling layer and an adhesive layer.

  As a result of investigation by the present inventor, in the pressure-sensitive adhesive sheet roll using the double-sided release sheet, the first release between the heavy release layer and the pressure-sensitive adhesive layer is the release force of the light release layer and the heavy release layer. It was found that the difference was smaller. The difference in peel force between the light release layer and the heavy release layer is reduced because the release agent, release control agent, etc. migrate from the heavy release layer to the light release layer during storage of the double-sided release sheet. I found it. Therefore, the present inventor has examined means for preventing the release agent, release control agent, and the like from transferring from the heavy release layer to the light release layer. As a result, the following double-sided release sheet and pressure-sensitive adhesive sheet roll were invented based on the idea that the contact area between the heavy release layer and the light release layer should be reduced.

The present invention includes the following configurations.
[1] A double-sided release sheet having a base material, a light release layer provided on one surface of the base material, and a heavy release layer provided on the other surface of the base material and having a higher release force than the light release layer There,
A double-sided release sheet comprising a large number of convex portions on one or both surfaces.
[2] The double-sided release sheet according to [1], wherein the peel strength of the heavy release layer is 1.1 to 8.0 times the peel strength of the light release layer.
[3] The double-sided release sheet according to [1] or [2], which has a convex portion only on one surface.
[4] A pressure-sensitive adhesive sheet comprising the double-sided release sheet according to any one of [1] to [3] and a pressure-sensitive adhesive layer provided on the opposite surface of the double release layer of the double-sided release sheet. The pressure-sensitive adhesive sheet roll is characterized in that the pressure-sensitive adhesive sheet is wound.

The long-sided storage of the double-sided release sheet of the present invention is stored for a long time, and even between those stored for a long time, the space between the light release layer and the pressure-sensitive adhesive layer is more reliably between the heavy release layer and the pressure-sensitive adhesive layer. A pressure-sensitive adhesive sheet roll that is peeled first can be obtained.
In the pressure-sensitive adhesive sheet roll of the present invention, the light release layer and the pressure-sensitive adhesive layer can be reliably peeled first before the space between the heavy release layer and the pressure-sensitive adhesive layer.

<First Embodiment>
(Double-sided release sheet)
One embodiment of the double-sided release sheet of the present invention will be described. For convenience of description, the thickness ratios of the base material, light release layer, heavy release layer, and pressure-sensitive adhesive layer in the drawings used in the following description are different from actual ones.
In FIG. 1, the double-sided peeling sheet of this embodiment is shown. The double-sided release sheet 10 includes a base material 11 made of a plastic film, a light release layer 12 provided on one surface of the base material 11, and a heavy release layer 13 provided on the other surface of the base material 11. It is what you have.

Moreover, the double-sided release sheet 10 of this embodiment has many convex parts 14a only on the surface 14 on the heavy release layer 13 side. A portion of the surface 14 on the side of the heavy release layer 13 other than the convex portion 14a is a flat portion 14b.
The convex portion 14a in the present embodiment is an annular convex portion having a semi-through hole 14c formed inside.
The number of the convex portions 14a is preferably 5 / cm ² or more, and more preferably 5 to 10000 / cm ² . If the number of protrusions 14a is 5 pieces / cm ² or more, the contact area with the light release layer 12 can be reliably reduced when wound, and if it is 10,000 pieces / cm ² or less, it is half the unit area. Since the number of the through-holes 14c decreases, the tensile strength of the double-sided release sheet 10 can be sufficiently ensured.
The height of the convex portion 14a is preferably 1 to 150 μm, more preferably 5 to 100 μm, and particularly preferably 7 to 85 μm. If the height of the convex portion 14a is 1 μm or more, the contact area with the light release layer 12 can be reliably reduced when wound, and if it is 150 μm or less, the convex portion 14a can be easily formed.
As the size of the convex portion 14a, the maximum diameter is preferably 5 to 2000 μm, and more preferably 10 to 1500 μm. If the maximum diameter of the convex portion 14a is 5 μm or more, the convex portion 14a can be easily formed. On the other hand, if the maximum diameter is 2000 μm or less, the number of convex portions 14a per unit area increases, and the contact area with the light release layer 12 can be reliably reduced when wound.

[Base material]
As the base material 11, for example, a plastic film or paper can be used.
Examples of the plastic film include various polymer films such as polypropylene, polyethylene, polyester such as polyethylene terephthalate and polybutylene terephthalate, and polyvinyl chloride. The polymer film may be stretched or non-stretched.
Examples of the paper include cast coated paper, art paper, coated paper, high quality paper, craft paper, and glassine paper.
Moreover, as the base material 11, vapor deposition paper, synthetic paper, cloth, non-woven fabric, metal foil, or the like can be used.
Furthermore, these laminated bodies may be sufficient.
Among the base materials 11, a plastic film is preferable, and biaxially stretched polypropylene (OPP) is more preferable because formation of the convex portion 14a by piercing with a hot needle, which will be described later, becomes easy and strength can be secured.

  The thickness of the substrate 11 is preferably 30 to 90 μm. If the thickness of the substrate 11 is 30 μm or more, the tensile strength of the double-sided release sheet 10 can be sufficiently secured, and if it is 90 μm or less, the flexibility can be sufficiently secured.

[Light release layer, heavy release layer]
Both the light release layer 12 and the heavy release layer 13 are layers containing a release agent.
The heavy release layer 13 has a higher release force than the light release layer 12. Preferably, the peeling force of the heavy release layer 13 is 1.1 to 8.0 times, more preferably 3.0 to 5.0 times that of the light release layer 12.
If the release force of the heavy release layer 13 is 1.1 times or more the release force of the light release layer 12, the space between the light release layer 12 and the adhesive layer is between the heavy release layer 13 and the adhesive layer. Furthermore, the adhesive sheet winding body which peels previously reliably can be obtained. On the other hand, if the peeling force of the heavy release layer 13 is 8.0 times or less than the peeling force of the light release layer 12, no adhesive remains and the peeling tends to be easy.
In the double-sided release sheet of the present invention, as in this embodiment, the surface of the heavy release layer 13 preferably has a convex portion 14a, and the surface of the light release layer 12 is preferably flat.

As the release agent constituting the light release layer 12 and the heavy release layer 13, for example, a general-purpose addition type or condensation type silicone release agent or a long-chain alkyl group-containing compound is used. In particular, an addition type silicone release agent having high reactivity is preferably used. These release agents are used as an emulsion, a solvent type or a solventless type.
Specific examples of silicone release agents include BY24-4527 and SD-7220 manufactured by Toray Dow Corning, and KS-3600, KS-774, and X62-2600 manufactured by Shin-Etsu Chemical Co., Ltd. Can be mentioned. Further, the silicone-based release agent may contain a silicone resin that is an organosilicon compound having a SiO ₂ unit and (CH ₃ ) ₃ SiO _1/2 unit or CH ₂ ═CH (CH ₃ ) SiO _1/2 unit. preferable. Specific examples of the silicone resin include BY24-843, SD-7292, and SHR-1404 manufactured by Toray Dow Corning, and KS-3800 and X92-183 manufactured by Shin-Etsu Chemical Co., Ltd.

Examples of a method for adjusting the peeling force of the light release layer 12 and the heavy release layer 13 include a method of reducing the peeling force by crosslinking a release agent. When this method is applied, the light release layer 12 is formed by crosslinking the release agent, and the heavy release layer 13 is formed without crosslinking the release agent.
Moreover, as a method of adjusting peeling force, the method of adding a peeling regulator and enlarging peeling force is mentioned. When this method is applied, the release agent is added to form the heavy release layer 13, and the light release layer 12 is formed without adding the release agent.
As the release adjusting agent, for example, a known one can be used as long as it is included in the release agent to increase the release force. For example, the SiO ₂ unit and (CH ₃ ) ₃ SiO _1/2 unit or SiO ₂ can be used. Those having units and CH ₂ ═CH (CH ₃ ) ₂ SiO _1/2 units are mentioned. The former does not have a functional group and is non-reactive, so when another layer comes into contact, it tends to move to that layer, but the crosslinking density tends to be low. On the other hand, since the latter has a vinyl group and is reactive, the crosslinking density tends to increase. However, when the other layers come into contact with each other, it is difficult to shift to the layer. For example, SD-7292 (manufactured by Dow Corning Toray), KS-3800 (manufactured by Shin-Etsu Chemical Co., Ltd.), or the like can be used as the release controlling agent having reactivity. Moreover, as a non-reactive peeling regulator, BY24-843 (made by Toray Dow Corning) etc. can be used, for example.

  The thicknesses of the light release layer 12 and the heavy release layer 13 are each preferably 0.01 to 1.0 μm. If the thickness of the light release layer 12 and the heavy release layer 13 is 0.01 μm or more, sufficient peelability can be secured, and if the thickness is 1.0 μm or less, the light release layer 12 and the heavy release layer 13 are easily formed. become able to.

[Production method]
A method for manufacturing the double-sided release sheet 10 will be described by taking as an example a method for forming the convex portion 14a using a hot needle.
In the manufacturing method of this example, first, a light release agent is applied to one surface of the substrate 11 to provide a flat light release layer 12, and a heavy release agent is applied to the other surface to provide a flat heavy release. The layer 13 is provided to obtain a double-sided peelable sheet.

The coating amount of the light release agent and heavy release agent is preferably 0.01 to 1.0 g / m ² in terms of dry mass. If the coating amount is 0.01 g / m ² or more, the peelability can be sufficiently secured, and if it is 1.0 g / m ² or less, the release agent can be easily applied.

Examples of the coating method include a method using a coating machine such as a reverse roll coater, knife coater, bar coater, slot die coater, air knife coater, reverse gravure coater, vario gravure coater, curtain coater.
From the viewpoint of productivity, it is preferable to dry the release agent after coating the release agent. Examples of the drying method include a hot air drying method, an infrared drying method, and a vacuum drying method.

  Next, as shown in FIG. 2, the hot needle A is pressed against the surface 13 a on the side of the heavy release layer 13 of the double-sided peelable sheet to form a half through hole 14 c. Thus, when the hot needle A is pressed against the surface 13a on the side of the heavy release layer 13, the portion of the heavy release layer 13 pressed by the hot needle A moves around the hot needle A, and In order to swell on the surface 13a on the release layer 13 side, as shown in FIG. 1, an annular convex portion 14a having a semi-through hole 14c formed inside is formed. Thereby, the double-sided release sheet 10 is obtained.

[Function and effect]
The double-sided release sheet 10 is usually stored in a wound state. As shown in FIG. 3, the light release layer 12 and the heavy release layer 13 face each other when the double-sided release sheet 10 is wound. In the double-sided release sheet 10 of this embodiment, the surface 13a opposite to the substrate 11 of the heavy release layer 13 has a large number of convex portions 14a. The contact area with the release layer 13 is small. Therefore, even if it is stored for a long time in a wound state (for example, stored for one year), it is presumed that the release adjusting agent hardly migrates from the heavy release layer 13 to the light release layer 12. Therefore, even when the double-sided release sheet 10 stored for a long time in a wound state is used, the light release layer 12 and the pressure-sensitive adhesive layer are reliably peeled first before the heavy release layer 13 and the pressure-sensitive adhesive layer. A sheet winding body can be obtained.

(Adhesive sheet roll)
1st Embodiment of the adhesive sheet winding body of this invention is described.
In FIG. 4, the adhesive sheet winding body of this embodiment is shown. The pressure-sensitive adhesive sheet roll 1 includes a pressure-sensitive adhesive sheet 1a comprising the double-sided release sheet 10 and a pressure-sensitive adhesive layer 20 provided on the surface 14 of the double release layer 13 of the double-sided release sheet 10 on the side opposite to the substrate 11. It is what has. Moreover, as for the adhesive sheet winding body 1 of this embodiment, the adhesive sheet 1a is wound so that the adhesive layer 20 may become inside, and the adhesive layer 20 is stuck to the light peeling layer 12. FIG.

[Adhesive layer]
The pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer 20 is not particularly limited as long as a desired pressure-sensitive adhesive force can be obtained. For example, any pressure-sensitive adhesives such as rubber-based, acrylic-based, and vinyl ether-based can be used. Among these, an acrylic pressure-sensitive adhesive is preferable because it is excellent in weather resistance, transparency, and the like and can be used for a wide range of applications.
As the acrylic pressure-sensitive adhesive, there are an emulsion type, a solvent type, a hot melt type, and the like, and any type can be used in the present invention. Among these, emulsion-type acrylic pressure-sensitive adhesives are preferable from the viewpoints of safety, quality, and cost.

The pressure-sensitive adhesive layer 20 may contain other optional components as necessary. Examples of other optional components include adhesive microspheres, thickeners, pH adjusters, antifoaming agents, antiseptic / antifungal agents, pigments, inorganic fillers, stabilizers, wetting agents, wetting agents and the like.
Further, the pressure-sensitive adhesive layer 20 can contain a tackifier in order to change the tensile speed dependency of the adhesive force or improve the adhesion to the olefin resin. Examples of tackifiers include rosin resins, terpene resins, aliphatic petroleum resins, aromatic petroleum resins, hydrogenated petroleum resins, styrene resins, and alkylphenol resins. A rosin resin is preferable in terms of good adhesion to polyolefin. Examples of the rosin resin include rosin, polymerized rosin, hydrogenated rosin, rosin ester, and hydrogenated rosin ester.
Furthermore, a surfactant may be added in order to improve the wetting (familiarity) with the cleaning water within a range not impairing the object of the present invention.

  The thickness of the pressure-sensitive adhesive layer 20 is preferably 5 to 100 μm. If the thickness of the pressure-sensitive adhesive layer 20 is 5 μm or more, the pressure-sensitive adhesive property of the pressure-sensitive adhesive layer 20 can be sufficiently secured, and if it is 100 μm or less, the pressure-sensitive adhesive layer 20 does not become thicker than necessary, so that the cost can be reduced.

In the pressure-sensitive adhesive sheet roll 1 of the present embodiment, an annular recess 22 and an annular ring adjacent to the outer edge of the recess 22 are formed on the surface 20a of the pressure-sensitive adhesive layer 20 on the side of the heavy release layer 13 as shown in FIG. A large number of outer edge convex portions 23 are formed. Inside the concave portion 22, a minute convex portion 24 is formed that is higher in height than the bottom portion 22 a of the concave portion 22 and lower in height than the top portion 23 a of the outer edge convex portion 23.
Therefore, the surface 20a on the side of the heavy release layer 13 of the pressure-sensitive adhesive layer 20 includes a plurality of circular portions including the concave portions 22, the outer edge convex portions 23, and the minute convex portions 24, and other flat portions (flat portions 25). It is composed of
As will be described later, the concave portion 22, the outer edge convex portion 23, and the minute convex portion 24 are formed by the pressure-sensitive adhesive layer 20 coming into contact with the surface 14 having the convex portion 14 a of the heavy release layer 13.

[Production method]
An example of a method for producing the pressure-sensitive adhesive sheet roll 1 will be described.
In the manufacturing method of this example, first, an adhesive is applied to the process release sheet, and dried as necessary to form the adhesive layer 20.
The coating amount of the pressure-sensitive adhesive is preferably 5 to 40 g / m ² in terms of dry mass. If the coating amount is 5 g / m ² or more, the adhesiveness of the pressure-sensitive adhesive layer 20 can be sufficiently secured, and if it is 40 g / m ² or less, the occurrence of sticking out of the adhesive can be prevented.
The pressure-sensitive adhesive coating method and drying method can be the same methods as the release agent coating method and drying method.

Next, after the pressure-sensitive adhesive layer 20 on the process release sheet was bonded to the surface 14 of the heavy release layer 13 of the double-sided release sheet 10, the process release sheet was peeled off, and the pressure release layer was applied to the surface 14 on the heavy release layer 13 side. 20 is provided and the adhesive sheet 1a is obtained.
In a state where the heavy release layer 13 and the pressure-sensitive adhesive layer 20 are in contact with each other, as shown in FIG. 4, the convex portions 14 a on the surface 14 of the heavy release layer 13 push away a part of the pressure-sensitive adhesive layer 20, thereby The recess 22 is formed. At this time, a part of the pushed-off pressure-sensitive adhesive layer 20 is raised, and the outer edge convex portion 23 is formed. As a result, a large number of concave portions 22 and outer edge convex portions 23 adjacent to the outer edges of the concave portions 22 are formed in the pressure-sensitive adhesive layer 20. At this time, since the semi-through hole 14c is formed inside the annular convex portion 14a of the heavy release layer 13, the concave portion 22 of the pressure-sensitive adhesive layer 20 is annular, and the minute convex portion 24 is formed inside thereof. Is done.

  Next, the pressure-sensitive adhesive sheet 1 a is wound so that the pressure-sensitive adhesive layer 20 is inside the double-sided release sheet 10, and the pressure-sensitive adhesive sheet roll 1 is obtained.

[Function and effect]
In the pressure-sensitive adhesive sheet roll 1 of the present embodiment, since the double-sided release sheet 10 is used, the space between the light release layer 12 and the pressure-sensitive adhesive layer 20 is more reliable than between the heavy release layer 13 and the pressure-sensitive adhesive layer 20. Can be peeled off first. Therefore, the adhesive sheet 1a can be reliably fed out from the adhesive sheet roll 1.

[how to use]
When using the pressure-sensitive adhesive sheet roll 1 of the present embodiment, first, as shown in FIG. 6, the light release layer 12 and the pressure-sensitive adhesive layer 20 are peeled, and the pressure-sensitive adhesive sheet roll 1 is used. feeding an adhesive sheet 1a, as shown in FIG. 7, adhering the exposed surface 20b of the adhesive layer 20 to the first member B _1.
Next, as shown in FIG. 8, the double-sided release sheet 10 is peeled from the pressure-sensitive adhesive layer 20 to expose the other surface 20 a of the pressure-sensitive adhesive layer 20. Then, as shown in FIG. 9, pasting a second member B ₂ on the surface 20a of exposing.

As the first member B ₁ and the second member B ₂ , for example, an optical member (for example, an antireflection body, a retardation plate, a diffusion plate, etc.), a member having a mirror surface (for example, a glass substrate, a resin substrate, etc.) , Electrical members, posters, stickers, automobile interior materials, boards, wallpaper substrates, and the like.

As described above, in this embodiment, the surface 20a of the pressure-sensitive adhesive layer 20 that is in contact with the heavy release layer 13 has unevenness (recesses 22, outer edge protrusions 23, and minute protrusions 24). when contacting the second member B ₂ mirror-finished in adhesive layer 20, a gap is formed therebetween. Therefore, it is possible to provisionally bonded wear state of being weakly adhering the second member B ₂ in the adhesive layer 20, it can be re-attached. Further, in the temporary bonded wear state, and the adhesive layer 20 can remove air between the second member B _2, it is possible to prevent the air bubbles from entering.
Further, after the temporary lamination wearing state, it is pressed, by eliminating the gap between the adhesive layer 20 and the second member B _2, can be present attached.

In addition, the double-sided peeling sheet and adhesive sheet winding body of this invention are not limited to the said embodiment. For example, in the double-sided release sheet, there may be many protrusions only on the surface 15 on the light release layer 12 side, or the protrusions on both the surface 14 on the heavy release layer 13 side and the surface 15 on the light release layer 12 side. You may have many. Even in such a double-sided release sheet, the contact area between the light release layer 12 and the heavy release layer 13 in a wound state is small. Therefore, a pressure-sensitive adhesive sheet roll in which the light release layer 12 and the pressure-sensitive adhesive layer are reliably peeled first can be obtained from between the heavy release layer 13 and the pressure-sensitive adhesive layer.
However, when both the surface 14 on the side of the heavy release layer 13 and the surface 15 on the side of the light release layer 12 have a large number of convex portions, when the double-sided release sheet 10 is wound, the side of the heavy release layer 13 The unevenness of the surface 14 and the unevenness of the surface 15 on the light release layer 12 side may be fitted to each other to reduce the contact area. Therefore, in the double-sided release sheet of the present invention, the contact area between the light release layer 12 and the heavy release layer 13 in a wound state is particularly small, so only the surface 14 opposite to the substrate 11 of the heavy release layer 13 is used. Or it is preferable to have the convex part 14a only in the surface 15 by the side of the light peeling layer 12. FIG.
Further, the adhesive layer 20 which is bonded to the first member B ₁ can provisionally bonded wearing second member B _2, since it can be accurately positioned and the convex portion 14a is formed on the surface of the peelable layer 13 Preferably it is.

Even when a large number of convex portions are provided only on the surface 15 on the light release layer 12 side, a large number of convex portions are provided on both the surface 14 on the heavy release layer 13 side and the surface 15 on the light release layer 12 side. Alternatively, the pressure-sensitive adhesive sheet roll can be obtained by providing the pressure-sensitive adhesive layer 20 on the surface 14 on the side of the heavy release layer 13 and winding the pressure-sensitive adhesive layer 20 so as to be inside.
When there are many convex portions only on the surface 15 on the light release layer 12 side, when the pressure-sensitive adhesive sheet 1a is wound, the surface of the pressure-sensitive adhesive layer 20 on the light release layer 12 side has a concave portion 22 and an outer edge. Convex part 23 and minute convex part 24 are formed.
When there are a large number of convex portions on both the surface 14 on the side of the heavy release layer 13 and the surface 15 on the side of the light release layer 12, the adhesive layer 20 is provided on the surface 14 on the side of the heavy release layer 13. The concave portion 22, the outer edge convex portion 23, and the minute convex portion 24 are formed on the surface of the heavy release layer 13 side. Further, when the pressure-sensitive adhesive sheet 1 a is wound, the concave portion 22, the outer edge convex portion 23, and the minute convex portion 24 are formed on the surface of the pressure-sensitive adhesive layer 20 on the light release layer 12 side.

As a method of forming the convex portion 14a that is an annular convex portion, for example, a mechanical method in which an embossing roll, a roller with diamond particles, a punching blade, or the like is pressed against a double-sided release sheet on which no convex portion is formed, laser beam drilling A method, an electron beam perforation method, a plasma perforation method, a high-pressure discharge perforation method, or the like can also be applied. However, in the point which can form the convex part 14a easily, the method of pressing the hot needle A like the embodiment mentioned above is preferable.
The convex part which the surface of a double-sided peeling sheet has does not need to be an annular convex part by which the half through-hole was formed inside, for example, the unevenness | corrugation of a geometric pattern, and irregular unevenness | corrugation may be sufficient. Even when such irregularities are formed, the method of forming the convex portions 14a described above can be applied.
In addition, it is not necessary to apply a method of processing a double-sided release sheet on which a convex portion is not formed for the formation of the convex portion. For example, the convex and concave portions are formed in advance on one or both sides of the base material, and the concave and convex portions remain. You may apply the method etc. which apply | coat a release agent to a grade and form.

  Moreover, as a formation method of a convex part, the method of piercing with a hot needle from the single side | surface of the double-sided peeling sheet in which the convex part is not formed is mentioned. In this method, the release agent moves around the hot needle and rises on both the side where the hot needle is stuck and the side where the hot needle sticks. Thereby, the cyclic | annular convex part by which the through-hole was formed inside can be formed in both surfaces. Thus, also in the double-sided peeling sheet in which the convex part was formed, the contact area of the light peeling layer 12 and the heavy peeling layer 13 in the wound state can be made small. Therefore, even when a double-sided release sheet stored for a long time in a wound state is used, the pressure-sensitive adhesive sheet that reliably peels first between the light release layer 12 and the pressure-sensitive adhesive layer than between the heavy release layer 13 and the pressure-sensitive adhesive layer. A wound body can be obtained. In addition, when the pressure-sensitive adhesive layer is laminated on the heavy release layer 13 on which the convex portions are formed, a concave portion, an outer edge convex portion, and a minute convex portion can be formed on the surface of the pressure-sensitive adhesive layer on the heavy release layer 13 side. Can be attached. In addition, when the pressure-sensitive adhesive sheet is wound into a wound body, the convex portion on the light release layer 12 side pushes away a part of the pressure-sensitive adhesive layer, so that a concave portion is formed on the surface of the pressure-sensitive adhesive layer on the heavy release layer 13 side. An outer edge convex part and a micro convex part can be formed, and temporary sticking becomes possible.

It is sectional drawing which shows one Embodiment of the double-sided peeling sheet of this invention. It is sectional drawing which shows 1 process at the time of manufacturing the double-sided peeling sheet of FIG. It is sectional drawing which shows the state which wound the double-sided peeling sheet of FIG. It is sectional drawing which shows one Embodiment of the adhesive sheet winding body of this invention. It is an expanded sectional view which shows the unevenness | corrugation of an adhesive layer. It is a figure explaining the usage method of the adhesive sheet winding body of this invention. It is a figure explaining the usage method of the adhesive sheet winding body of this invention. It is a figure explaining the usage method of the adhesive sheet winding body of this invention. It is a figure explaining the usage method of the adhesive sheet winding body of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Adhesive sheet winding body 1a Adhesive sheet 10 Double-sided release sheet 11 Base material 12 Light release layer 13 Heavy release layer 14a Convex part 14c Semi-through-hole 20 Adhesive layer 22 Concave part 23 Outer edge convex part 24 Minute convex part

Claims (4)

A double-sided release sheet having a base material, a light release layer provided on one side of the base material, and a heavy release layer provided on the other side of the base material and having a higher release force than the light release layer,
A double-sided release sheet comprising a large number of convex portions on one or both surfaces.   The double-sided release sheet according to claim 1, wherein the release force of the heavy release layer is 1.1 to 8.0 times the release force of the light release layer.   The double-sided release sheet according to claim 1, wherein the double-sided release sheet has a convex portion only on one surface.   A pressure-sensitive adhesive sheet comprising the double-sided release sheet according to any one of claims 1 to 3, and a pressure-sensitive adhesive layer provided on a surface opposite to the substrate of the heavy release layer of the double-sided release sheet, A pressure-sensitive adhesive sheet roll, wherein the pressure-sensitive adhesive sheet is wound.

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