JP2020019833A - Double-sided adhesive sheet with release sheet and method for manufacturing double-sided adhesive sheet with release sheet - Google Patents

Abstract

To provide a double-sided adhesive sheet with a release sheet that has both excellent processability and air release property.SOLUTION: The double-sided adhesive sheet with a release sheet has a first release sheet, a first adhesive layer, a second adhesive layer and a second release sheet laminated in this order. In the double-sided adhesive sheet with a release sheet, the second adhesive layer is laminated directly on the first adhesive layer; the adhesive force of the first adhesive layer to glass is 10 to 1,000 times the adhesive force of the second adhesive layer to glass; the peel force upon peeling the second release sheet from the second adhesive layer is larger than the peel force upon peeling the first release sheet from the first adhesive layer.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a double-sided PSA sheet with a release sheet and a method for producing a double-sided PSA sheet with a release sheet.

  In recent years, in various fields, a display device such as a liquid crystal display (LCD), and an image display device combining a display device such as a touch panel and an input device are widely used. In these display devices and input devices, a double-sided pressure-sensitive adhesive sheet is used for bonding optical members.

  The double-sided pressure-sensitive adhesive sheet is sometimes used for bonding different kinds of adherends. In this case, the double-sided pressure-sensitive adhesive sheet is required to have an optimum pressure-sensitive adhesive force according to the adhesion characteristics of each adherend. For example, Patent Documents 1 and 2 disclose a double-sided pressure-sensitive adhesive sheet provided with two or more pressure-sensitive adhesive layers having different pressure-sensitive adhesive properties.

  2. Description of the Related Art In a display device and an input device, a surface is covered with a protective sheet to protect a display surface. The protection sheet is made of, for example, a glass sheet provided with an adhesive layer, and the protection sheet is bonded to the display surface to prevent the liquid crystal display from cracking or being damaged. When such a protective sheet is used, it may be necessary to rework (re-peel) the protective sheet in order to correct the bonding position or replace the protective sheet due to aging. For example, Patent Document 3 discloses a double-sided pressure-sensitive adhesive sheet that has at least two pressure-sensitive adhesive layers and is configured to be removable from a display surface of a display device. In the example of Patent Literature 3, the pressure-sensitive adhesive layers are formed from different types of acrylic polymers, and studies are being made to improve the durability and reworkability of the double-sided pressure-sensitive adhesive sheet. Note that the double-sided pressure-sensitive adhesive sheet of Patent Document 3 is intended for attaching a display surface and a touch panel.

JP-A-5-17725 JP 2011-57883 A JP-A-2004-231723

  However, when the double-sided pressure-sensitive adhesive sheet of the related art is removed from the adherend again, there is a problem that the pressure-sensitive adhesive remains on the adherend during the rework operation. When the adhesive remains on the adherend, it is necessary to wipe off the adhesive with a solvent or to wash the adhesive, which is a problem because the rework operation takes time and effort. In particular, a protective sheet that can be bonded and reworked by ordinary consumers who cannot use special equipment, jigs, and chemicals must be easily reworked from the display surface. The adhesion must be extremely low. On the other hand, the double-sided pressure-sensitive adhesive sheet used for the protective sheet needs to firmly adhere to the object to be attached on the side opposite to the display surface. Generally, since it is difficult to laminate the pressure-sensitive adhesive layers having such conflicting pressure-sensitive properties, a double-sided pressure-sensitive adhesive sheet provided with a base film between a slight pressure-sensitive adhesive layer and a strong pressure-sensitive adhesive layer is used. I have. However, a double-sided pressure-sensitive adhesive sheet having a base film provided between a slight pressure-sensitive adhesive layer and a strong pressure-sensitive adhesive layer tends to increase in thickness, and cannot meet recent demands for thinning or has a high level of transparency. There was a problem that it could not be achieved.

  For this reason, the present inventor has proceeded with the development of a double-sided pressure-sensitive adhesive sheet in which no base film is provided between the slightly pressure-sensitive adhesive layer and the strong pressure-sensitive adhesive layer. However, when a release sheet is provided on both surfaces of such a double-sided pressure-sensitive adhesive sheet, since the release sheet on the fine pressure-sensitive adhesive layer side peels off first, it is difficult to peel off the release sheet on the strong pressure-sensitive adhesive layer side first. In addition, it was difficult to process the peeled sheet on the side of the strong adhesive layer first and then adhere the adherend to the side of the strong adhesive layer and leave the release sheet on the side of the slightly adhesive layer. In addition, by increasing the adhesive strength of the slightly adhesive layer, it is conceivable to suppress the releasability of the release sheet on the slightly adhesive layer side.However, when the adhesive force of the slightly adhesive layer is increased, in addition to the deterioration of reworkability, When attaching the slightly adhesive layer to the adherend, air (bubbles) may be trapped, which is a problem.

  Therefore, an object of the present invention is to provide a double-sided pressure-sensitive adhesive sheet with a release sheet that is excellent in workability of the double-sided pressure-sensitive adhesive sheet and has good air bleeding property on the side of the fine pressure-sensitive adhesive layer in order to solve the above-mentioned problems. That is, the present invention is a double-sided pressure-sensitive adhesive sheet with a release sheet that is easy to process because the release order of the release sheet is not limited (the release sheet on the side of the strong adhesive layer can be released first). An object of the present invention is to provide a double-sided pressure-sensitive adhesive sheet with a release sheet, which can suppress air entrapment because air is easily released when the air-permeable sheet is adhered to an adherend.

As a result of intensive studies to solve the above problems, the present inventors have found that a first release sheet, a first pressure-sensitive adhesive layer, a second pressure-sensitive adhesive layer, and a second release sheet are laminated in this order. In the double-sided pressure-sensitive adhesive sheet provided with the release sheet, the peeling force at the time of peeling the second release sheet from the slightly pressure-sensitive second pressure-sensitive adhesive layer, the first release sheet from the strong pressure-sensitive first pressure-sensitive adhesive layer It has been found that a double-sided pressure-sensitive adhesive sheet with a release sheet having excellent workability and good air bleeding property on the side of the fine pressure-sensitive adhesive layer can be obtained by increasing the peeling force at the time of peeling.
Specifically, the present invention has the following configuration.

[1] A double-sided PSA sheet with a release sheet in which a first release sheet, a first PSA layer, a second PSA layer, and a second release sheet are laminated in this order,
The second pressure-sensitive adhesive layer is directly laminated on the first pressure-sensitive adhesive layer,
The first pressure-sensitive adhesive layer has a glass adhesive strength of 10 to 1000 times the glass adhesive strength of the second pressure-sensitive adhesive layer,
A double-sided pressure-sensitive adhesive sheet with a release sheet, wherein the release force at the time of peeling the second release sheet from the second pressure-sensitive adhesive layer is greater than the release force at the time of peeling the first release sheet from the first pressure-sensitive adhesive layer. .
[2] The double-sided pressure-sensitive adhesive sheet with a release sheet according to [1], wherein the interface pressure between the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer is 1 N / 25 mm or more.
[3] [1] or [2], wherein the first pressure-sensitive adhesive layer has an adhesive force to glass of 1 to 50 N / 25 mm, and the second adhesive layer has an adhesive force to glass of 0.01 to 1 N / 25 mm. ] The double-sided pressure-sensitive adhesive sheet with a release sheet according to [1].
[4] The double-sided pressure-sensitive adhesive with a release sheet according to any one of [1] to [3], wherein the first pressure-sensitive adhesive layer is an acrylic pressure-sensitive adhesive layer, and the second pressure-sensitive adhesive layer is a silicone-based pressure-sensitive adhesive layer. Sheet.
[5] The double-sided pressure-sensitive adhesive sheet with a release sheet according to any one of [1] to [4], wherein the first release sheet contains a silicone-based release agent.
[6] The double-sided pressure-sensitive adhesive sheet with a release sheet according to any one of [1] to [5], wherein the release load of the second release sheet is 70 to 20,000 mN / 50 mm.
[7] forming a first pressure-sensitive adhesive layer on the first release sheet, and forming a second pressure-sensitive adhesive layer on the second release sheet;
Laminating the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer so as to be in contact with each other, a method for producing a double-sided pressure-sensitive adhesive sheet with a release sheet,
The first pressure-sensitive adhesive layer has a glass adhesive strength of 10 to 1000 times the glass adhesive strength of the second pressure-sensitive adhesive layer,
A method for producing a double-sided PSA sheet with a release sheet, wherein the release force of the second release sheet is greater than the release force of the first release sheet.

  According to the present invention, it is possible to obtain a double-sided pressure-sensitive adhesive sheet with a release sheet, which is excellent in processability and has good air bleeding property on the slightly pressure-sensitive adhesive layer side.

FIG. 1 is a cross-sectional view illustrating a configuration of a double-sided pressure-sensitive adhesive sheet with a release sheet of the present invention.

  Hereinafter, the present invention will be described in detail. The description of the components described below may be made based on representative embodiments or specific examples, but the present invention is not limited to such embodiments.

(Double-sided adhesive sheet with release sheet)
The present invention relates to a double-sided PSA sheet with a release sheet in which a first release sheet, a first PSA layer, a second PSA layer, and a second release sheet are laminated in this order. Here, the second pressure-sensitive adhesive layer is directly laminated on the first pressure-sensitive adhesive layer, and the first pressure-sensitive adhesive layer has a glass adhesive strength of the second pressure-sensitive adhesive layer with respect to glass adhesive strength. It is 10 to 1000 times. In addition, the peeling force when peeling the second release sheet from the second pressure-sensitive adhesive layer is greater than the peeling force when peeling the first release sheet from the first pressure-sensitive adhesive layer. Since the double-sided pressure-sensitive adhesive sheet composed of the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer has a plurality of pressure-sensitive adhesive layers, it can be called a double-sided laminated pressure-sensitive adhesive sheet.

  Since the double-sided pressure-sensitive adhesive sheet with a release sheet of the present invention has the above configuration, it is excellent in workability. Here, excellent workability means that the release order of the release sheet is not limited, that is, that the release sheet on the strong adhesive layer side can be released first, and therefore, from the double-sided adhesive sheet with a release sheet. It means that it is easy to manufacture various laminates by peeling at least one release sheet. In the present invention, the first release sheet attached to the first pressure-sensitive adhesive layer, which is strongly adhered, is in a state where it is easily released first, so the first release sheet on the first pressure-sensitive adhesive layer side. Can be processed in such a manner that an adherend is attached to the first pressure-sensitive adhesive layer side and a release sheet is left on the second pressure-sensitive adhesive layer side. For example, after the first release sheet on the first pressure-sensitive adhesive layer side is peeled off first, a glass sheet is bonded on the first pressure-sensitive adhesive layer side, and the glass sheet, the first pressure-sensitive adhesive layer, and the second A laminate in which the pressure-sensitive adhesive layer and the second release sheet are bonded in this order can be easily manufactured. Such a laminate is preferably used, for example, as a surface protection sheet for a liquid crystal display.

  Further, when the second pressure-sensitive adhesive layer is bonded to an adherend after the second release sheet of the double-sided pressure-sensitive adhesive sheet with a release sheet of the present invention is peeled off, the second pressure-sensitive adhesive layer and the adherend are adhered. Air (bubbles) is prevented from being caught between them. That is, the second pressure-sensitive adhesive layer has excellent air bleeding property, and no air bubbles remain at the interface between the second pressure-sensitive adhesive layer and the adherend when the second pressure-sensitive adhesive layer is adhered to the adherend. . In the present invention, in order to increase the peeling force between the second pressure-sensitive adhesive layer and the second release sheet (enhance the adhesion), instead of increasing the adhesive force of the second pressure-sensitive adhesive layer, a second release sheet is used. Since the release property of the second pressure-sensitive adhesive layer is controlled, the air release property of the second pressure-sensitive adhesive layer is not impaired. That is, the present invention has succeeded in achieving two contradictory characteristics such as workability and air bleedability.

  FIG. 1 is a cross-sectional view illustrating a configuration of a double-sided pressure-sensitive adhesive sheet with a release sheet of the present invention. The double-sided pressure-sensitive adhesive sheet 100 with a release sheet of the present invention has a first pressure-sensitive adhesive layer 10 and a second pressure-sensitive adhesive layer 12, and a first release sheet is provided on the first pressure-sensitive adhesive layer 10 side. 20 are laminated, and a second release sheet 22 is laminated on the second pressure-sensitive adhesive layer 12 side.

  In this specification, the first pressure-sensitive adhesive layer 10 and the second pressure-sensitive adhesive layer 12 are referred to as a double-sided pressure-sensitive adhesive sheet. As shown in FIG. 1, the double-sided pressure-sensitive adhesive sheet 50 preferably has a configuration in which a first pressure-sensitive adhesive layer 10 and a second pressure-sensitive adhesive layer 12 are laminated one by one, but includes two or more layers. There may be. For example, the first pressure-sensitive adhesive layer 10 shown as a one-layer configuration in FIG. 1 may have a laminated structure of two or more pressure-sensitive adhesive layers, and the second pressure-sensitive adhesive layer 12 may have a two-layer structure. It may have a laminated structure of the above pressure-sensitive adhesive layers. The double-sided pressure-sensitive adhesive sheet 50 is a double-sided pressure-sensitive adhesive sheet having no support (substrate) as shown in FIG. Therefore, in the double-sided pressure-sensitive adhesive sheet 50, the first pressure-sensitive adhesive layer 10 and the second pressure-sensitive adhesive layer 12 are laminated in a state of being in direct contact with each other. For this reason, the double-sided pressure-sensitive adhesive sheet can be made thinner as necessary.

  The adhesive strength to glass of the first pressure-sensitive adhesive layer constituting the double-sided pressure-sensitive adhesive sheet with a release sheet of the present invention may be at least 10 times the adhesive strength to glass of the second adhesive layer, and is 50 times or more. And more preferably 100 times or more. Further, the adhesive strength to glass of the first pressure-sensitive adhesive layer may be 1000 times or less, more preferably 600 times or less, of the second pressure-sensitive adhesive layer. Thus, it can be said that the first pressure-sensitive adhesive layer is a strong pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer is a slight pressure-sensitive adhesive layer. The first pressure-sensitive adhesive layer firmly adheres to an adherend such as glass by making the above-mentioned relationship between the first pressure-sensitive adhesive layer's adhesive strength to glass and the second adhesive layer's adhesive strength to glass. Thus, when the second pressure-sensitive adhesive layer is bonded to the adherend, it is easy to suppress the entrapment of air.

  The adhesive strength to glass of the first pressure-sensitive adhesive layer is preferably 1 N / 25 mm or more, more preferably 5 N / 25 mm or more, and even more preferably 10 N / 25 mm or more. Further, the first pressure-sensitive adhesive layer preferably has an adhesive strength to glass of 50 N / 25 mm or less.

  It is preferable that the second adhesive layer has an adhesive strength to glass of 0.01 N / 25 mm or more. Further, the adhesive force to glass of the second pressure-sensitive adhesive layer is preferably 1.5 / 25 mm or less, more preferably 0.5 N / 25 mm or less, and preferably 0.2 N / 25 mm or less. Particularly preferred.

  The adhesive strength to glass of the double-sided pressure-sensitive adhesive sheet was determined by applying a peeling speed of 300 mm / min and a peeling angle according to JIS Z 0237 method 24 hours after the pressure-sensitive adhesive surface of each pressure-sensitive adhesive layer was adhered to soda glass. This is a value measured under the condition of 180 °.

  In the double-sided PSA sheet with a release sheet of the present invention, the second PSA layer is directly laminated on the first PSA layer. It is preferable that the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer are firmly adhered to each other, and the interface pressure between the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer is 1 N / 25 mm or more. Is preferably 5 N / 25 mm or more, and more preferably 10 N / 25 mm or more. The upper limit of the interfacial adhesion between the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer is not particularly limited, but is preferably, for example, 100 N / 25 mm. As described above, in the double-sided pressure-sensitive adhesive sheet, the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer are firmly adhered to each other and have excellent interlayer adhesion. When the interfacial adhesive force between the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer is within the above range, the double-sided pressure-sensitive adhesive sheet is bonded to an adherend and then peeled off (when reworking). 4) It is possible to suppress occurrence of peeling between the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer, and as a result, reworkability can be improved.

The interfacial adhesion between the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer can be measured after preparing a sample for measuring interfacial adhesion as described in Examples.
As described in Examples, the interfacial adhesive strength was obtained 24 hours after obtaining the “double-sided pressure-sensitive adhesive sheet with a double-sided backing substrate” (24 hours after the second pressure-sensitive adhesive layer surface and the first pressure-sensitive adhesive layer surface were adhered). The second backing substrate is peeled off at a peeling rate of 300 mm / min and a peeling angle of 180 ° according to Method 1 of JIS Z 0237 to obtain a “first pressure-sensitive adhesive layer / second pressure-sensitive adhesive layer” interface. Of the adhesive strength.

  As described above, by adjusting the adhesive strength to glass of each pressure-sensitive adhesive layer and the interfacial adhesive strength between each pressure-sensitive adhesive layer within the above range, it has both strong adhesive strength to the adherend and excellent reworkability. The resulting double-sided PSA sheet is obtained. Here, the excellent reworkability means that when the double-sided pressure-sensitive adhesive sheet is adhered to the adherend and then peeled off, part of the pressure-sensitive adhesive of the double-sided pressure-sensitive adhesive sheet does not remain on the adherend, and the rework work It means the property that the double-sided pressure-sensitive adhesive sheet does not break. Further, one surface of the double-sided pressure-sensitive adhesive sheet can exert a strong adhesive force to an adherend, and particularly can exert a strong adhesive force to a glass surface. As described above, the double-sided pressure-sensitive adhesive sheet obtained by peeling the release sheet from the double-sided pressure-sensitive adhesive sheet with a release sheet of the present invention has both strong adhesive strength and excellent reworkability.

  Furthermore, since the double-sided pressure-sensitive adhesive sheet obtained by peeling the release sheet from the double-sided pressure-sensitive adhesive sheet with the release sheet of the present invention does not have a support (substrate) between each pressure-sensitive adhesive layer, the double-sided pressure-sensitive adhesive sheet has flexibility. have. For this reason, the double-sided pressure-sensitive adhesive sheet can exhibit excellent unevenness followability, and can be bonded to an adherend having an uneven structure (step structure). The layer in contact with the uneven structure (step structure) may be the first pressure-sensitive adhesive layer or the second pressure-sensitive adhesive layer.

  The total thickness of the double-sided PSA sheet with a release sheet of the present invention is preferably 100 μm or more, more preferably 150 m or more, and even more preferably 200 μm or more. Further, the thickness of the double-sided pressure-sensitive adhesive sheet with a release sheet is preferably 1200 μm or less, more preferably 800 μm or less, and even more preferably 500 μm or less. By setting the entire thickness of the double-sided pressure-sensitive adhesive sheet with the release sheet within the above range, the workability of the double-sided pressure-sensitive adhesive sheet with a release sheet can be enhanced, and the ease of release of the release sheet can be increased.

  The thickness of the double-sided pressure-sensitive adhesive sheet is preferably 10 μm or more, more preferably 20 μm or more, and even more preferably 50 μm or more. Further, the thickness of the double-sided pressure-sensitive adhesive sheet is preferably 1,000 μm or less, more preferably 800 μm or less, and still more preferably 600 μm or less. By setting the total thickness of the double-sided pressure-sensitive adhesive sheet within the above range, it becomes easy to achieve both strong pressure-sensitive adhesive strength and excellent reworkability.

The thickness of the first pressure-sensitive adhesive layer in the double-sided pressure-sensitive adhesive sheet is preferably 5 μm or more, more preferably 10 μm or more, and even more preferably 25 μm or more. The thickness of the first pressure-sensitive adhesive layer is preferably 500 μm or less, more preferably 400 μm or less, and still more preferably 300 μm or less.
Further, the thickness of the second pressure-sensitive adhesive layer is preferably 5 μm or more, more preferably 10 μm or more, and further preferably 25 μm or more. Further, the thickness of the second pressure-sensitive adhesive layer is preferably 500 μm or less, more preferably 400 μm or less, and further preferably 300 μm or less.

  In the present invention, when the thickness (μm) of the first pressure-sensitive adhesive layer is P and the thickness (μm) of the second pressure-sensitive adhesive layer is Q, P: Q = 1: 10 to 10: 1. Is preferred. By setting P: Q within the above range, one side of the double-sided pressure-sensitive adhesive sheet can exhibit strong adhesive strength to an adherend, while the other side can exhibit excellent reworkability. It becomes easier to obtain a sheet. In addition, P described above represents the total thickness of the first pressure-sensitive adhesive layer when the double-sided pressure-sensitive adhesive sheet includes two or more first pressure-sensitive adhesive layers. When two or more pressure-sensitive adhesive layers are included, the total thickness of the second pressure-sensitive adhesive layer is represented.

The thickness of the first release sheet in the double-sided pressure-sensitive adhesive sheet with a release sheet is preferably 5 μm or more, more preferably 20 μm or more, and even more preferably 30 μm or more. The thickness of the first release sheet is preferably 200 μm or less, more preferably 130 μm or less, and further preferably 100 μm or less.
Further, the thickness of the second release sheet is preferably 5 μm or more, more preferably 20 μm or more, and even more preferably 30 μm or more. The thickness of the second release sheet is preferably 200 μm or less, more preferably 130 μm or less, and even more preferably 100 μm or less. By setting the thickness of the first release sheet and the second release sheet within the above range, the workability of the double-sided pressure-sensitive adhesive sheet with a release sheet can be enhanced, and the ease of release of the release sheet can be enhanced.

  The haze of the double-sided PSA sheet is preferably 3% or less, more preferably 1% or less. In the present specification, the haze of the double-sided pressure-sensitive adhesive sheet refers to a value measured by a method based on JIS K 7136. When measuring the haze, the first adhesive layer surface of the double-sided adhesive sheet is bonded to a slide glass (product number: S9112) manufactured by Matsunami Glass Co., Ltd., and the haze value is measured. Specifically, after laminating the double-sided pressure-sensitive adhesive sheet to a slide glass manufactured by Matsunami Glass Co., in order to eliminate the influence of fine air mixed at the time of lamination, 0.5 MPa, 40 ° C. Autoclave (pressure degassing) treatment for 30 minutes. Thereafter, the second release sheet is peeled off, and measurement is performed using NDH4000 manufactured by Nippon Denshoku Industries Co., Ltd. with the glue surface exposed.

  The total light transmittance of the double-sided pressure-sensitive adhesive sheet is preferably 80% or more, more preferably 85% or more, and further preferably 90% or more. The double-sided pressure-sensitive adhesive sheet is characterized in that the total light transmittance is high and the transparency is excellent. In the present specification, the total light transmittance of the double-sided pressure-sensitive adhesive sheet refers to a value measured by a method according to JIS K 7136. The total light transmittance of the double-sided pressure-sensitive adhesive sheet can be measured by the same method as the above-described method for measuring the haze value.

<First adhesive layer>
The double-sided PSA sheet with a release sheet of the present invention includes a first PSA layer. In the present invention, the first pressure-sensitive adhesive layer is not particularly limited as long as the first pressure-sensitive adhesive layer can exhibit the above-described adhesive force and peeling force. In particular, the first pressure-sensitive adhesive layer is preferably an acrylic pressure-sensitive adhesive layer.

  When the first pressure-sensitive adhesive layer is an acrylic pressure-sensitive adhesive layer, the first pressure-sensitive adhesive layer is a layer containing an acrylic resin as a main component. Specifically, the content of the acrylic resin in the first pressure-sensitive adhesive layer is preferably 50% by mass or more, and more preferably 60% by mass or more based on the total mass of the first pressure-sensitive adhesive layer. The content is more preferably 70% by mass or more, further preferably 80% by mass or more, and particularly preferably 90% by mass or more.

  Examples of the acrylic resin include an acrylic pressure-sensitive adhesive containing an acrylic polymer as a base polymer. The acrylic polymer may contain at least one selected from a non-crosslinkable (meth) acrylate unit, an acrylic monomer unit having a crosslinkable functional group, and a bifunctional acrylic monomer unit. preferable. Here, the “monomer unit” is a repeating unit constituting a polymer. “Acrylic monomer” is a compound having a (meth) acryloyl group. “(Meth) acryloyl group” indicates an acryloyl group or a methacryloyl group. The non-crosslinkable acrylic monomer is an acrylic monomer having no crosslinkable group, and the crosslinkable acrylic monomer is a monomer having a crosslinkable group. The crosslinkable acrylic monomer may be an acrylic monomer or a non-acrylic monomer as long as it can be polymerized with the non-crosslinkable acrylic monomer. Is preferred. The crosslinkable group includes a carboxy group, a hydroxy group, an amino group, an epoxy group, a glycidyl group, and the like.

  Examples of the non-crosslinkable acrylic monomer unit include a (meth) acrylate unit in which a hydrogen atom of a carboxy group of (meth) acrylic acid is substituted with a hydrocarbon group. In the present invention, the acrylic pressure-sensitive adhesive layer preferably contains a (meth) acrylate unit.

  Specific examples of the (meth) acrylate include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, isopropyl (meth) acrylate, n-butyl (meth) acrylate, ( Isobutyl meth) acrylate, t-butyl (meth) acrylate, n-pentyl (meth) acrylate, n-hexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, n-octyl (meth) acrylate , Isooctyl (meth) acrylate, n-nonyl (meth) acrylate, isobornyl (meth) acrylate, isononyl (meth) acrylate, n-decyl (meth) acrylate, isodecyl (meth) acrylate, (meth) N-undecyl acrylate, n-dodecyl (meth) acrylate, stearyl (meth) acrylate, (meth) Methoxyethyl acrylate, ethoxyethyl (meth) acrylate, cyclohexyl (meth) acrylate include benzyl (meth) acrylate. Among them, it is preferable to use n-butyl acrylate, 2-ethylhexyl acrylate, and methyl acrylate from the viewpoint of adhesiveness. These may be used alone or in combination of two or more. In the present invention, “(meth) acrylic acid” means to include both “acrylic acid” and “methacrylic acid”.

Examples of the crosslinkable acrylic monomer unit include a carboxy group-containing copolymerizable monomer unit, a hydroxy group-containing copolymerizable monomer unit, an amino group-containing copolymerizable monomer unit, and a glycidyl group-containing copolymerizable unit. Monomer units.
Examples of the carboxy group-containing copolymerizable monomer include α, β-unsaturated carboxylic acids such as acrylic acid, methacrylic acid, crotonic acid, maleic acid, fumaric acid, itaconic acid, citraconic acid, and grataconic acid, and anhydrides thereof. Things.
Examples of the hydroxy group-containing copolymerizable monomer include (meth) acrylic acid such as 2-hydroxyethyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, and 2-hydroxypropyl (meth) acrylate. Examples include (meth) acrylic acid [(mono, di or poly) alkylene glycol] such as hydroxyalkyl, mono (diethylene glycol) (meth) acrylate, and lactone (meth) acrylate such as monocaprolactone (meth) acrylate.
Examples of the amino group-containing copolymerizable monomer include (meth) acrylamide, allylamide and the like.
Examples of the glycidyl group-containing copolymerizable monomer include glycidyl (meth) acrylate.

  The acrylic polymer is preferably an acrylic random copolymer, and more preferably a random copolymer of a crosslinkable acrylic monomer and a non-crosslinkable acrylic monomer. More specifically, it is preferably a random copolymer of acrylic acid and at least one selected from n-butyl acrylate, 2-ethylhexyl acrylate and methyl acrylate, and an acrylate ester copolymer. It is preferred that

  The weight average molecular weight (Mw) of the acrylic polymer is preferably from 200,000 to 2.5 million, and more preferably from 300,000 to 2,000,000. The weight average molecular weight (Mw) is calculated based on a calibration curve prepared by gel permeation chromatography (GPC) using a polystyrene standard substance.

The measurement conditions of gel permeation chromatography (GPC) are as follows.
Solvent: Tetrahydrofuran Column: Shodex KF801, KF803L, KF806L (Used by connecting three Showa Denko KK)
Column temperature: 40 ° C
Sample concentration: 0.5% by mass
Detector: RI-2031plus (manufactured by JASCO)
Pump: RI-2080plus (manufactured by JASCO)
Flow rate (flow rate): 0.8 ml / min
Injection volume: 10 μl
Calibration curve: Standard polystyrene Shodex standard polystyrene (manufactured by Showa Denko KK) Calibration curve of 10 samples from Mw = 1320 to 2,500,000 was used.

  The first pressure-sensitive adhesive layer may include a silane coupling agent. When the first pressure-sensitive adhesive layer contains a silane coupling agent, the interfacial adhesion between the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer can be further increased. Examples of the silane coupling agent include 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyltriethoxysilane, 3-glycidoxypropylmethyldiethoxysilane, and 2- (3,4-epoxycyclohexyl) Epoxy group-containing silane coupling agents such as ethyltrimethoxysilane; 3-aminopropyltrimethoxysilane, N-2- (aminoethyl) -3-aminopropylmethyldimethoxysilane, 3-triethoxysilyl-N- (1, Amino group-containing silane coupling agents such as 3-dimethylbutylidene) propylamine and N-phenyl-γ-aminopropyltrimethoxysilane; (3-acryloxypropyltrimethoxysilane, 3-methacryloxypropyltriethoxysilane and the like) (Meth) Acrylic group-containing silane Coupling agent; 3- isocyanate propyl isocyanate group-containing silane coupling agents such as triethoxysilane; and the like. Among them, the silane coupling agent is preferably an epoxy group-containing silane coupling agent.

  Further, as the silane coupling agent, one having a plurality of alkoxysilyl groups in the molecule can be used. Examples of such a silane coupling agent include X-41-1053, X-41-1059A, X-41-1056, X-41-1805, X-41-1818, and X-41-1053 manufactured by Shin-Etsu Chemical Co., Ltd. -41-1810, X-40-2651 and the like.

  The content of the silane coupling agent is preferably from 0.03% by mass to 5% by mass, and more preferably from 0.06% by mass to 1% by mass, based on the total mass of the first pressure-sensitive adhesive layer. Is more preferable. The silane coupling agents may be used alone or as a mixture of two or more.

  The first pressure-sensitive adhesive layer may include a crosslinking agent. That is, the pressure-sensitive adhesive composition forming the first pressure-sensitive adhesive layer preferably contains a crosslinking agent. For example, when the crosslinkable acrylic monomer as described above is contained in the pressure-sensitive adhesive composition, the crosslinking agent can accelerate the crosslinking reaction of the crosslinkable acrylic monomer. Examples of the crosslinking agent include, among known crosslinking agents such as an isocyanate compound, an epoxy compound, an oxazoline compound, an aziridine compound, a metal chelate compound, a butylated melamine compound, and a polyfunctional acrylate, the crosslinkability of a crosslinkable acrylic polymer. It can be appropriately selected in consideration of the reactivity with the functional group. The method of crosslinking can be selected from known methods such as thermal crosslinking or ionizing radiation crosslinking. After the formation of the adhesive layer, a curing treatment may be performed in an environment of 23 ° C. to further increase the degree of crosslinking.

Examples of the isocyanate compound include tolylene diisocyanate, xylylene diisocyanate, hexamethylene diisocyanate, and isophorone diisocyanate. The diisocyanate may be used as it is, or may be used as a trifunctional derivative such as an adduct, a nurate, or a buret.
As the epoxy compound, for example, ethylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, propylene glycol diglycidyl ether, polypropylene glycol diglycidyl ether, glycerin diglycidyl ether, neopentyl glycol diglycidyl ether, 1,6-hexanediol di Glycidyl ether, tetraglycidyl xylene diamine, 1,3-bis (N, N-diglycidylaminomethyl) cyclohexane, trimethylolpropane polyglycidyl ether, diglycerol polyglycidyl ether, polyglycerol polyglycidyl ether, sorbitol polyglycidyl ether, etc. No.

  As the crosslinking agent, one type may be used alone, or two or more types may be used in combination. The content of the crosslinking agent in the pressure-sensitive adhesive composition forming the first pressure-sensitive adhesive layer is appropriately selected according to desired pressure-sensitive adhesive properties and the like, and is not particularly limited. It is preferable that the amount is 0.01 part by mass or more and 5 parts by mass or less with respect to parts by mass.

The first pressure-sensitive adhesive layer may include a plasticizer, an antioxidant, a metal corrosion inhibitor, a tackifier, an ultraviolet absorber, an antistatic agent, a photopolymerization initiator, and a light stabilizer such as a hindered amine compound, if necessary. May be included.
As the plasticizer, for example, a non-functional acrylic polymer can be used. The non-functional acrylic polymer is a polymer consisting of only an acrylic monomer unit having no functional group other than the acrylate group, or having no functional group with an acrylic monomer unit having no functional group other than the acrylate group. It means a polymer composed of non-acrylic monomer units.
Examples of the antioxidant include a phenolic antioxidant, an amine antioxidant, a lactone antioxidant, a phosphorus antioxidant, and a sulfur antioxidant. One of these antioxidants may be used alone, or two or more thereof may be used in combination.
Examples of the metal corrosion inhibitor include a benzotriazole-based resin.
Examples of the tackifier include a rosin resin, a terpene resin, a terpene phenol resin, a coumarone indene resin, a styrene resin, a xylene resin, a phenol resin, and a petroleum resin.
Examples of the ultraviolet absorber include a benzotriazole-based compound and a benzophenone-based compound.

  In order to prevent the first pressure-sensitive adhesive layer from deteriorating with time, it is preferable to add an antioxidant. By adding an antioxidant, it is possible to prevent a decrease in adhesive strength due to deterioration of the double-sided pressure-sensitive adhesive sheet. Examples of the antiaging agent include general phenolic antioxidants, phosphorus-based antioxidants, UV inhibitors, HALS (hindered amine-based stabilizers), and the like.

  The pressure-sensitive adhesive composition forming the first pressure-sensitive adhesive layer may contain a solvent. The solvent evaporates when the pressure-sensitive adhesive layer is formed, but the first pressure-sensitive adhesive layer may contain the remaining solvent.

  Examples of the solvent include hydrocarbons such as hexane, heptane, octane, toluene, xylene, ethylbenzene, cyclohexane, and methylcyclohexane; halogenated hydrocarbons such as dichloromethane, trichloroethane, trichloroethylene, tetrachloroethylene, and dichloropropane; methanol, ethanol, Alcohols such as propanol, isopropyl alcohol, butanol, isobutyl alcohol and diacetone alcohol; ethers such as diethyl ether, diisopropyl ether, dioxane and tetrahydrofuran; ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone, isophorone and cyclohexanone; methyl acetate Esters such as ethyl acetate, butyl acetate, isobutyl acetate, amyl acetate, ethyl butyrate; Chi glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monomethyl ether acetate, propylene glycol monomethyl ether, propylene glycol monoethyl ether, polyols and derivatives thereof such as propylene glycol monomethyl ether acetate.

<Second pressure-sensitive adhesive layer>
The double-sided pressure-sensitive adhesive sheet with a release sheet of the present invention includes a second pressure-sensitive adhesive layer. In the present invention, the second pressure-sensitive adhesive layer is not particularly limited as long as the second pressure-sensitive adhesive layer can exhibit the above-described adhesive force and peeling force. As the pressure-sensitive adhesive constituting the second pressure-sensitive adhesive layer, an acrylic pressure-sensitive adhesive, a urethane-based pressure-sensitive adhesive, a silicone-based pressure-sensitive adhesive, and the like are preferable. Among them, a silicone-based pressure-sensitive adhesive having good air bleeding property is particularly preferably used.

  When the second pressure-sensitive adhesive layer is a silicone-based pressure-sensitive adhesive layer, the second pressure-sensitive adhesive layer is a layer containing a silicone-based resin (silicone-based pressure-sensitive adhesive) as a main component. Specifically, the content of the silicone-based resin in the second pressure-sensitive adhesive layer is preferably 50% by mass or more, and more preferably 60% by mass or more based on the total mass of the second pressure-sensitive adhesive layer. The content is more preferably 70% by mass or more, further preferably 80% by mass or more, and particularly preferably 90% by mass or more.

  Examples of the silicone resin include a silicone resin having a polysiloxane skeleton. Examples of the silicone resin include an addition reaction type, a condensation reaction type, an ultraviolet curing type, and an electron beam curing type. Among them, an addition-reaction type silicone resin is preferably used because of its high reactivity and excellent productivity. Examples of the addition reaction type silicone resin include, for example, an organopolysiloxane having two or more alkenyl groups having 2 to 10 carbon atoms such as a vinyl group, an allyl group, a propenyl group, and a hexenyl group at a terminal and / or a side chain of the molecule. Siloxane.

When using an addition reaction type silicone resin, it is preferable to use a crosslinking agent and a catalyst together. Examples of the crosslinking agent include an organopolysiloxane having a hydrogen atom bonded to at least two silicon atoms in one molecule. Specifically, dimethylhydrogensiloxy group terminal-blocked dimethylsiloxane-methylhydrogensiloxane copolymer, trimethylsiloxy group terminal-blocked dimethylsiloxane-methylhydrogensiloxane copolymer, trimethylsiloxy group-terminal-blocked methylhydrogenpolysiloxane, Poly (hydrogensilsesquioxane) and the like.
Examples of the catalyst include fine platinum particles, fine platinum particles adsorbed on a carbon powder carrier, chloroplatinic acid, alcohol-modified chloroplatinic acid, olefin complexes of chloroplatinic acid, palladium, and white metal compounds such as rhodium. No.

  Commercial products can be used as the silicone-based pressure-sensitive adhesive. Examples of such a silicone-based adhesive include KR-3704 and X40-3306 manufactured by Shin-Etsu Chemical Co., Ltd., DC7651ADHESIVE and SD7587LPSA manufactured by Dow Corning Toray Co., Ltd., SE9500 manufactured by Aika Kogyo Co., Ltd. SE9600 and the like.

  The urethane-based pressure-sensitive adhesive is a pressure-sensitive adhesive mainly composed of a reaction product of a polyol and a polyisocyanate. The polyol is preferably a known polyol having two or more hydroxyl groups. Examples of the polyol include polyacryl polyol, polyether polyol, polyester polyol, polycaprolactone polyol, polycarbonate polyol, castor oil-based polyol, and the like. The polyisocyanate is preferably a known aromatic polyisocyanate, aliphatic polyisocyanate, araliphatic polyisocyanate, or alicyclic polyisocyanate. A known catalyst can be used for the reaction between the polyol and the polyisocyanate. Examples of the catalyst include a tertiary amine compound and an organometallic compound.

  The hydroxyl value of the urethane-based pressure-sensitive adhesive is preferably from 1 to 30 mgKOH / g, more preferably from 10 to 25 mgKOH / g. The hydroxyl value can be adjusted by a known method such as adjusting the mixing ratio of the polyol and the polyisocyanate. When the hydroxyl value is within a predetermined range, a pressure-sensitive adhesive layer having a good crosslinking density is easily obtained, and wettability is further improved.

  As the urethane-based pressure-sensitive adhesive, a commercially available product can be used. Examples of such urethane-based pressure-sensitive adhesives include SH-101, SH-101M, and SH-109 manufactured by Toyochem Corporation.

  Examples of the acrylic pressure-sensitive adhesive include a fine acrylic pressure-sensitive adhesive containing an acrylic polymer as a base polymer. The acrylic polymer may contain at least one selected from a non-crosslinkable (meth) acrylate unit, an acrylic monomer unit having a crosslinkable functional group, and a bifunctional acrylic monomer unit. preferable.

  A commercial product can be used as the acrylic pressure-sensitive adhesive. Examples of such an acrylic pressure-sensitive adhesive include Finetac CT-3088 manufactured by DIC Corporation and BPS6078TF manufactured by Toyochem Corporation.

The second pressure-sensitive adhesive layer may contain additives such as an antioxidant, a metal corrosion inhibitor, a tackifier, an ultraviolet absorber, a hindered amine compound, an antistatic agent, and a light stabilizer, if necessary. Good.
Examples of the antioxidant include a phenolic antioxidant, an amine antioxidant, a lactone antioxidant, a phosphorus antioxidant, and a sulfur antioxidant. One of these antioxidants may be used alone, or two or more thereof may be used in combination.
Examples of the metal corrosion inhibitor include a benzotriazole-based resin.
Examples of the tackifier include a rosin resin, a terpene resin, a terpene phenol resin, a coumarone indene resin, a styrene resin, a xylene resin, a phenol resin, and a petroleum resin.
Examples of the ultraviolet absorber include a benzotriazole-based compound and a benzophenone-based compound.

  In order to prevent the second pressure-sensitive adhesive layer from deteriorating with time, it is preferable to add an antioxidant. By adding an antioxidant, it is possible to prevent a decrease in adhesive strength due to deterioration of the double-sided pressure-sensitive adhesive sheet. Examples of the antiaging agent include general phenolic antioxidants, phosphorus-based antioxidants, UV inhibitors, HALS (hindered amine-based stabilizers), and the like.

  The pressure-sensitive adhesive composition forming the second pressure-sensitive adhesive layer may contain a solvent. The solvent evaporates when the pressure-sensitive adhesive layer is formed, but the second pressure-sensitive adhesive layer may contain the remaining solvent. Examples of the solvent include the same solvents as those that can be contained in the pressure-sensitive adhesive composition that forms the first pressure-sensitive adhesive layer.

<First release sheet>
The double-sided PSA sheet with a release sheet of the present invention includes a first release sheet. The first release sheet is preferably a release laminate sheet having a release sheet substrate and a release agent layer provided on one surface of the release sheet substrate. Paper or a polymer film is used as a release sheet substrate in the release laminate sheet. Examples of the polymer film used for the release sheet substrate include a polyethylene terephthalate resin film, a polypropylene resin film, and a polyimide resin film. Among them, a polyethylene terephthalate resin film is particularly preferable in terms of economy and surface smoothness.

  The release agent layer in the release laminated sheet is preferably composed of a release agent, and the release agent is preferably a silicone-based release agent. That is, the first release sheet is preferably a sheet containing a silicone-based release agent, and more preferably a sheet containing a release agent layer composed of a silicone-based release agent.

Examples of the silicone release agent include an addition type silicone release agent and a condensation type silicone release agent. Among them, an addition type silicone release agent having high reactivity is preferably used. Specific examples of the silicone release agent include BY24-4527 and SD-7220 manufactured by Dow Corning Toray Silicone Co., Ltd., and KS-3600, KS-774, and X62-2600 manufactured by Shin-Etsu Chemical Co., Ltd. Is mentioned. Further, the silicone-based release agent may contain a silicone resin which is an organosilicon compound having SiO ₂ units and (CH ₃ ) ₃ SiO _1/2 units or CH ₂ ＣＨCH (CH ₃ ) SiO _1/2 units. .

The silicone-based release agent may include a polyorganosiloxane and a polyorganohydrogensiloxane. The polyorganosiloxane preferably has an alkenyl group directly bonded to at least two silicon atoms in one molecule, and further has an epoxy bonded to at least two silicon atoms in one molecule via a carbon atom. It is preferable to use a polyorganosiloxane having a group and having substantially no hydrogen atom directly bonded to a silicon atom. The polyorganohydrogensiloxane preferably has at least three hydrogen atoms directly bonded to silicon atoms in one molecule, and has a kinematic viscosity at 25 ° C. of 1 mm ² / s or more. Further, the silicone-based release agent may include a platinum-based catalyst. Specific examples of silicone-based release agents and platinum-based catalysts containing polyorganosiloxane and polyorganohydrogensiloxane include KS-3800, X-62-183, X-62-2829, X-X, manufactured by Shin-Etsu Chemical Co., Ltd. -62-2853, X-62-2856, X-62-2857, PL-5000, PL-50T, LTC-856, LTC-761, SRX-212, SRX-212, manufactured by Toray Dow Corning Co., Ltd., Momentive Inc. XS56-C4880, XS56-C4617, XS56-C4434, TPR-6600, XC94-C4326, and the like. Further, a release control agent may be used in combination to adjust the release property of the release agent layer.

The coating amount of the release agent of the first release sheet is preferably 0.05 to 0.5 g / m ^2, more preferably from 0.08~0.3g / m ^2, 0.1~ More preferably, it is 0.2 g / m ² . The thickness of the release agent layer of the first release sheet is preferably from 50 to 500 nm, more preferably from 80 to 300 nm, and still more preferably from 100 to 200 nm. As a method for providing a release agent layer, a conventionally known coating method such as reverse roll coating, gravure coating, bar coating, doctor blade coating, or the like can be used.

  The peeling force at the time of peeling the first release sheet from the first pressure-sensitive adhesive layer is preferably 0.01 N / 50 mm or more, and more preferably 0.1 N / 50 mm or more. Further, the peeling force at the time of peeling the first release sheet from the first pressure-sensitive adhesive layer is preferably 1.0 N / 50 mm or less, more preferably 0.8 N / 50 mm or less. More preferably, it is 6 N / 50 mm or less.

  The peeling force when peeling the first release sheet from the first pressure-sensitive adhesive layer is such that the first release sheet / the first pressure-sensitive adhesive layer / the second pressure-sensitive adhesive layer / the second release sheet is in this order. The laminated double-sided pressure-sensitive adhesive sheet with a release sheet is cut out to 50 mm × 100 mm, and the first release sheet is measured by peeling at a peeling rate of 300 mm / min and a peeling angle of 180 ° according to Method 1 of JIS Z 0237. .

<Second release sheet>
The double-sided PSA sheet with a release sheet of the present invention includes a second release sheet. The second release sheet may be a release laminate sheet having a release sheet substrate and a release agent layer provided on one surface of the release sheet substrate, and may be composed of only the release sheet substrate. It may be a sheet. Paper or a polymer film is used as a release sheet substrate in the release laminate sheet. When the second release sheet is a sheet composed of only a release sheet substrate, the release sheet substrate is preferably a polymer film substrate. Examples of the polymer film used as the base material for the release sheet include a polyethylene terephthalate resin film, a polypropylene resin film, and a polyimide resin film. A polyethylene terephthalate resin film is particularly preferable in terms of economy and surface smoothness.

  The peeling load of the second peeling sheet is preferably 70 to 20,000 mN / 50 mm. When a release sheet coated with a release agent is used as the second release sheet, the release load of the second release sheet is preferably within the above range. The release load of the second release sheet is more preferably 100 to 18000 mN / 50 mm, and further preferably 120 to 17000 mN / 50 mm. By setting the peeling load of the second release sheet at or above the lower limit value, the peeling force of the second release sheet from the second pressure-sensitive adhesive layer is released from the first pressure-sensitive adhesive layer of the first release sheet. It is easy to make it larger than the force. Here, the peeling load was measured by No. The surface of the second release sheet on which the second pressure-sensitive adhesive layer surface is to be bonded is adhered to 100 pressure-sensitive adhesive layers, left at room temperature for 24 hours, and then separated at 180 ° at a peeling speed of 300 m / min. This is the peel force when the release sheet is peeled.

  When the second release sheet is a release laminate sheet having a release sheet substrate and a release agent layer provided on one surface of the release sheet substrate, the release layer is composed of a release agent. Is preferred. In this case, the release agent is preferably a fluorosilicone release agent. The fluorosilicone release agent contains at least one fluorine atom-containing organic group in one molecule.

  When the second release sheet is a release laminate sheet having a release sheet substrate and a release agent layer provided on one surface of the release sheet substrate, the release agent may be a non-silicone release. Good. Examples of the non-silicone-based release agent include an aminoalkyd-based resin.

  It is preferable that the second release sheet contains the above-mentioned non-silicone release agent, or the total content of the silicone-based release agent and the non-silicone release agent is 1% by mass or less. That is, the second release sheet preferably contains either the non-silicone release agent as described above or substantially no release agent. In this specification, when the content of the release agent in the second release sheet is 1% by mass or less, it is assumed that the release agent is not substantially contained. When the second release sheet does not substantially contain a release agent, the second release sheet is preferably a substrate made of a polymer film. Examples of the polymer film include a polyester film and the like.

  When the second release sheet contains a release agent, the thickness of the release agent layer is preferably from 0.03 μm to 5 μm, more preferably from 0.05 μm to 2 μm, and more preferably from 0.08 μm to 1 μm. It is more preferred that: As a method for providing a release agent layer, a conventionally known coating method such as reverse roll coating, gravure coating, bar coating, doctor blade coating, or the like can be used.

  The peeling force at the time of peeling the second release sheet from the second pressure-sensitive adhesive layer is preferably 0.5 N / 50 mm or more, and more preferably 0.6 N / 50 mm or more. Further, the peeling force at the time of peeling the second release sheet from the second pressure-sensitive adhesive layer is preferably 10.0 N / 50 mm or less, more preferably 5.0 N / 50 mm or less, and 3. More preferably, it is 0 N / 50 mm or less.

  When measuring the peeling force when peeling the second release sheet from the second pressure-sensitive adhesive layer, first, the first release sheet / first pressure-sensitive adhesive layer / second pressure-sensitive adhesive layer / second pressure-sensitive adhesive layer Of the double-sided pressure-sensitive adhesive sheet with a release sheet laminated in this order is cut into 50 mm × 100 mm, and a PET film (A4300 # 100) with an easy-adhesion layer made by Toyobo is adhered to the first release sheet as a backing substrate. I do. Thereafter, the second peeling sheet is peeled off at a peeling rate of 300 mm / min and a peeling angle of 180 ° according to JIS Z 0237 Method 1 to measure the peeling force.

In the double-sided pressure-sensitive adhesive sheet with a release sheet of the present invention, each release sheet has a different release force, and the release force when releasing the second release sheet from the second pressure-sensitive adhesive layer is the first pressure-sensitive adhesive. It is larger than the peeling force when peeling the first release sheet from the agent layer. When the peeling force at the time of peeling the second release sheet from the second pressure-sensitive adhesive layer is _RH and the peeling force at the time of peeling the first release sheet from the first pressure-sensitive adhesive layer is _RL , The ratio of R _H to R _L (R _H / R _L ) is preferably 1.2 or more, and more preferably 1.5 or more.

(Production method of double-sided PSA sheet with release sheet)
The method for producing the double-sided pressure-sensitive adhesive sheet with a release sheet is not particularly limited, but the production process of the double-sided pressure-sensitive adhesive sheet with a release sheet of the present invention includes forming a first pressure-sensitive adhesive layer on the first release sheet, It is preferable to include a step of forming a second pressure-sensitive adhesive layer on a release sheet, and a step of bonding the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer so as to be in contact with each other. The step of forming each pressure-sensitive adhesive layer on each release sheet is preferably a step of applying each pressure-sensitive adhesive composition constituting each pressure-sensitive adhesive layer on a release sheet. Further, the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer are simultaneously or sequentially formed on the first release sheet or the second release sheet, and the second release sheet or the first release sheet is bonded. May be.

The application of each pressure-sensitive adhesive composition can be performed using a known coating device. Examples of the coating device include a blade coater, an air knife coater, a roll coater, a bar coater, a gravure coater, a microgravure coater, a rod blade coater, a lip coater, a die coater, a curtain coater, and the like.
After the coating, a drying step is preferably provided, and the drying step can be performed using a known heating device such as a heating furnace or an infrared lamp. Thus, the first pressure-sensitive adhesive layer is formed on the first release sheet, and the second pressure-sensitive adhesive layer is formed on the second release sheet.

  The step of laminating the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer so as to be in contact with each other includes a step of laminating the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer so as to be in direct contact with each other, and pressure bonding. Is preferred. The pressing method is not particularly limited, but it is preferable to use a roll bonding machine capable of continuously pressing. Thus, a double-sided PSA sheet with a release sheet in which the first release sheet, the first PSA layer, the second PSA layer, and the second release sheet are laminated in this order is obtained.

  Before the step of bonding the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer so as to be in contact with each other, each pressure-sensitive adhesive layer may be subjected to a surface activation treatment. Here, examples of the surface activation treatment include a corona treatment and a plasma treatment.

  The surface activation treatment is preferably performed on the surface on the bonding surface side of each pressure-sensitive adhesive layer. The surface activation treatment may be performed on one selected from the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer, or may be performed on both. For example, when the first pressure-sensitive adhesive layer has been subjected to a surface activation treatment, the surface activation treatment surface preferably has a wet tension of 70 mN / m or more, and more preferably 73 mN / m or more. In addition, the upper limit of the wetting tension of the surface activation-treated surface is not particularly limited. Further, it is preferable that the wetting tension of the first pressure-sensitive adhesive layer after the surface activation treatment is 1.1 times or more as compared with the wetting tension of the first pressure-sensitive adhesive layer before the surface activation treatment. When the surface activation treatment is performed only on one of the surfaces of the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer, the surface activation treatment is preferably performed on the first pressure-sensitive adhesive layer. .

  When the surface on the interface side of the second pressure-sensitive adhesive layer is a surface activated surface, the wetting tension of the surface activated surface is preferably 30 mN / m or more, more preferably 34 mN / m or more. preferable. The upper limit of the wetting tension of the surface activated surface is not particularly limited, but is preferably, for example, 45 mN / m in order to prevent a decrease in transparency. The wetting tension is measured by applying a wetting indication standard solution (manufactured by Wako Pure Chemical Industries, Ltd.) to the surface of the adhesive layer according to JIS K 6768 1999.

  Examples of the corona treatment include a method of discharging in a normal pressure air by a corona treatment machine. The corona output in the corona treatment is not particularly limited, but is preferably, for example, 0.5 kW or more and 8.0 kW or less, more preferably 0.5 kW or more and 7.0 kW or less, and more preferably 0.5 kW or more. More preferably, it is not less than 6.0 kW. The processing speed in the corona treatment is preferably from 5 m / min to 100 m / min, more preferably from 5 m / min to 90 m / min, even more preferably from 5 m / min to 80 m / min. .

  Examples of the plasma treatment include a method in which discharge is performed in normal-pressure air by a plasma discharge machine. The plasma output in the plasma processing is not particularly limited, but is preferably, for example, 0.5 kW or more and 5.0 kW or less, more preferably 0.5 kW or more and 3.0 kW or less, and more preferably 0.5 kW or more. More preferably, it is 1.5 kW or less. The processing speed in the plasma processing is preferably from 5 m / min to 100 m / min, more preferably from 5 m / min to 90 m / min, even more preferably from 5 m / min to 80 m / min. .

(Application)
The double-sided pressure-sensitive adhesive sheet with a release sheet of the present invention is preferably used for bonding various members after the release sheet is released. The application of the bonding is not limited, but is preferably for bonding optical members. Examples of the optical member include a liquid crystal display and a touch panel. In particular, the double-sided pressure-sensitive adhesive sheet after the release sheet is peeled off is preferably used for bonding glass and a liquid crystal display, or glass and a touch panel.

  Alternatively, only one of the release sheets may be peeled off and bonded to various members. For example, by peeling the first release sheet of the double-sided pressure-sensitive adhesive sheet with a release sheet of the present invention and bonding the first pressure-sensitive adhesive layer to glass, glass, the first pressure-sensitive adhesive layer, and the second pressure-sensitive adhesive A laminate in which the layer and the second release sheet are laminated in this order may be obtained. Such a laminate is preferably used, for example, as a protective film for an optical member. In this case, a general consumer may peel off the second release sheet in the laminate and bond it to a liquid crystal display. By using the double-sided pressure-sensitive adhesive sheet with a release sheet of the present invention, it is easy to process a laminated body in which glass, a first pressure-sensitive adhesive layer, a second pressure-sensitive adhesive layer, and a second release sheet are laminated in this order, and Easy to process into protective film. In addition, when a general consumer peels off the second release sheet in the above-mentioned laminate and pastes it on a liquid crystal display, air entrapment is small, and the protective film can be adhered neatly.

  Hereinafter, features of the present invention will be described more specifically with reference to examples and comparative examples. Materials, usage amounts, ratios, processing contents, processing procedures, and the like shown in the following examples can be appropriately changed without departing from the spirit of the present invention. Therefore, the scope of the present invention should not be construed as being limited by the specific examples described below.

[Example 1]
<Preparation of acrylic pressure-sensitive adhesive composition>
(Adhesive composition 1A)
90 parts by mass of n-butyl acrylate (BA) and 10 parts by mass of acrylic acid (AA) were copolymerized to prepare a (meth) acrylate polymer. The weight average molecular weight of this (meth) acrylate polymer was 500,000.
100 parts by mass of the obtained (meth) acrylate polymer, 1,3-bis (N, N'-diglycidylaminomethyl) cyclohexane (TERAD-C, manufactured by Mitsubishi Gas Chemical Company) as an epoxy-based crosslinking agent. Of a silicone alkoxy oligomer (X-41-1810, manufactured by Shin-Etsu Chemical Co., Ltd.) as a silane coupling agent was mixed with 0.15 part by mass, and the mixture was sufficiently stirred to obtain a solid content concentration of 40% by mass. The resulting mixture was diluted with ethyl acetate to obtain an acrylic pressure-sensitive adhesive composition.

<Preparation of silicone-based pressure-sensitive adhesive composition>
(Adhesive composition 2A)
100 parts by mass of an addition-type organopolysiloxane (KS-847H, manufactured by Shin-Etsu Chemical Co., Ltd.) composed of an organopolysiloxane having a siloxane bond as a main skeleton and having a vinyl group and an organohydrogenpolysiloxane (solid content conversion value; the same applies hereinafter) 20) parts by mass of an organopolysiloxane containing trifunctional or tetrafunctional siloxane units (silicone resin; SD-4584, manufactured by Toray Dow Corning Co., Ltd.), and a platinum catalyst (SRX-212, manufactured by Toray Dow Corning Co., Ltd.) Five parts by mass were mixed, sufficiently stirred, and diluted with methyl ethyl ketone so as to have a solid content concentration of 40% by mass to obtain a silicone-based pressure-sensitive adhesive composition.

<Preparation of double-sided PSA sheet with release sheet>
A 38 μm-thick polyethylene terephthalate film (Oji F-tex, 38RL-07 (2)) provided with a release agent layer obtained by treating an acrylic pressure-sensitive adhesive composition with a silicone release agent (first release sheet) The first release sheet is adhered on one side by applying evenly with an applicator so that the coating amount after drying is 50 μm on the surface of, and drying for 3 minutes in an air circulating constant temperature oven at 100 ° C. The obtained acrylic pressure-sensitive adhesive layer was obtained. The pressure-sensitive adhesive layer having the first release sheet adhered to one side was cured in an environment of 23 ° C. and 50% relative humidity for 7 days.

  Next, the coating amount after drying the silicone-based pressure-sensitive adhesive composition on the surface of a 38 μm-thick polyethylene terephthalate film (Lumilar S-10 # 38, manufactured by Toray Industries, Inc.) (second release sheet) becomes 50 μm. Thus, a silicone-based pressure-sensitive adhesive layer having a second release sheet adhered to one side was obtained by uniformly coating with an applicator and drying in an air-circulating constant temperature oven at 100 ° C. for 3 minutes. The peeling load of Lumirror S-10 / 10 was 16000 mN / 50 mm.

Corona discharge treatment was performed on each surface of the acrylic pressure-sensitive adhesive layer and the silicone-based pressure-sensitive adhesive layer. The corona discharge treatment was performed using a corona surface treatment device manufactured by Kasuga Electric. The corona discharge treatment was performed under the condition that the wet tension of the acrylic pressure-sensitive adhesive layer was 70 mN / m or more and the wet tension of the silicone pressure-sensitive adhesive layer was 30 mN / m or more.
The first release sheet / first pressure-sensitive adhesive layer (acrylic pressure-sensitive adhesive layer) is formed by bonding the exposed surface of the acrylic pressure-sensitive adhesive layer subjected to the surface activation treatment and the exposed surface of the silicone-based pressure-sensitive adhesive layer to each other. Thus, a double-sided pressure-sensitive adhesive sheet with a release sheet was obtained in which // second pressure-sensitive adhesive layer (silicone-based pressure-sensitive adhesive layer) / second release sheet was laminated in this order.

[Example 2]
<Preparation of a double-sided pressure-sensitive adhesive sheet with a release sheet>, except that the silicone-based pressure-sensitive adhesive composition was applied to the surface of a fluorosilicone-based release sheet (SS4C substrate thickness 75 μm, manufactured by Nipa) (second release sheet) In the same manner as in Example 1, a double-sided PSA sheet with a release sheet was obtained. The peeling load of SS4C was 340 mN / 50 mm.

[Example 3]
<Preparation of silicone-based pressure-sensitive adhesive composition>
(Adhesive composition 2B)
The silicone adhesive KR3704 manufactured by Shin-Etsu Chemical and the platinum catalyst PL50T manufactured by Shin-Etsu Chemical are sufficiently stirred at a ratio of 100 / 0.5, and diluted with toluene so that the solid content concentration becomes 40% by mass. Composition 2B was obtained.

  <Preparation of a double-sided pressure-sensitive adhesive sheet with a release sheet> A double-sided pressure-sensitive adhesive sheet with a release sheet was obtained in the same manner as in Example 1 except that the silicone-based pressure-sensitive adhesive composition was changed to pressure-sensitive adhesive composition 2B.

[Example 4]
<Preparation of urethane-based pressure-sensitive adhesive composition>
(Adhesive composition 2C)
Adhesion by mixing 6 parts by mass of T-501B (solid content: 75% by mass) as a polyisocyanate component with 100 parts by mass of urethane fine adhesive SH-101 (solid content: 60% by mass) manufactured by Toyochem Co., Ltd. Agent composition C was obtained.

  <Preparation of a double-sided pressure-sensitive adhesive sheet with a release sheet> A double-sided pressure-sensitive adhesive sheet with a release sheet was obtained in the same manner as in Example 2 except that the silicone-based pressure-sensitive adhesive composition 2A was changed to the urethane-based pressure-sensitive adhesive composition 2C.

[Example 5]
<Preparation of acrylic pressure-sensitive adhesive composition>
(Adhesive composition 1B)
100 parts by mass of N-9369 manufactured by Nippon Synthetic Chemical Co., Ltd. and 0.9 parts by mass of curing agent L-55E are mixed, sufficiently stirred, and diluted with ethyl acetate so that the solid concentration becomes 40% by mass. By doing so, an acrylic pressure-sensitive adhesive composition 1B was obtained.

<Preparation of silicone-based pressure-sensitive adhesive composition>
(Adhesive composition 2D)
Toray Dow Corning Co., Ltd. 100 parts by mass of a silicone-based micro-adhesive DOWSIL 7646 Adhesive, Toray Dow Corning Co., Ltd. silicone-based cross-linking agent 7678 1 part by mass, and Toray Dow Corning Co., Ltd. catalyst NC-25 0.3 The silicone adhesive composition 2D was obtained by mixing parts by mass, sufficiently stirring, and diluting with methyl ethyl ketone so that the solid content concentration became 40% by mass.

<Preparation of double-sided PSA sheet with release sheet>
<Production of a double-sided pressure-sensitive adhesive sheet with a release sheet> In Examples, the acrylic pressure-sensitive adhesive composition 1A was changed to the acrylic pressure-sensitive adhesive composition 1B, and the silicone-based pressure-sensitive adhesive composition 2A was changed to the silicone-based pressure-sensitive adhesive composition 2D. In the same manner as in Example 1, a double-sided PSA sheet with a release sheet was obtained.

[Comparative Example 1]
<Preparation of a double-sided pressure-sensitive adhesive sheet with a release sheet>, except that the silicone-based pressure-sensitive adhesive composition was applied to the surface of a fluorosilicone-based release sheet (manufactured by Nipah Co., Ltd., FSC6 base material thickness: 75 μm) (second release sheet) In the same manner as in Example 1, a double-sided PSA sheet with a release sheet was obtained. The peeling load of FSC6 was 50 mN / 50 mm.

[Comparative Example 2]
<Preparation of silicone-based pressure-sensitive adhesive composition>
(Adhesive composition 2E)
A silicone adhesive KR3704 manufactured by Shin-Etsu Chemical Co., Ltd., a silicone adhesive KR3700 manufactured by Shin-Etsu Chemical Co., Ltd., and a platinum catalyst PL50T manufactured by Shin-Etsu Chemical are mixed at a ratio of 90/10 / 0.5, and the mixture is sufficiently stirred to obtain a solid content of 40%. By diluting with toluene so as to be mass%, a silicone-based pressure-sensitive adhesive composition 2E was obtained.

  In <Preparation of a double-sided pressure-sensitive adhesive sheet with a release sheet>, the silicone pressure-sensitive adhesive composition was referred to as pressure-sensitive adhesive composition 2E, and the second release sheet was referred to as a fluorosilicone-based release sheet (manufactured by Nipah, FSC6 base material thickness 75 μm). Except for the above, a double-sided PSA sheet with a release sheet was obtained in the same manner as in Example 1.

(Measurement and evaluation)
<Measurement of adhesive strength>
(Adhesive strength of first adhesive layer)
<Preparation of a double-sided pressure-sensitive adhesive sheet with a release sheet> The double-sided pressure-sensitive adhesive sheet with a release sheet obtained in the step of cutting was cut into a width of 25 mm x 10 cm, and then the first release sheet was peeled off, and the pressure-sensitive adhesive of the first pressure-sensitive adhesive layer was removed. The surface was stuck on soda glass. The second release sheet was released from the second pressure-sensitive adhesive layer surface, and the second pressure-sensitive adhesive layer surface was subjected to a surface activation treatment. Thereafter, a polyethylene terephthalate film with an easy-adhesion layer, on which an acrylic pressure-sensitive adhesive layer similarly subjected to a surface activation treatment was adhered, was adhered to the second adhesive layer surface as a backing substrate. Twenty-four hours after the adhesion, the adhesion of the first pressure-sensitive adhesive layer surface to the glass was measured under the conditions of a peeling speed of 300 mm / min and a peeling angle of 180 ° according to Method 1 of JIS Z 0237. The polyethylene terephthalate film with an easy-adhesion layer to which the surface-activated acrylic pressure-sensitive adhesive layer was adhered was used as an acrylic adhesive layer having a CCL / D1 / T3T3 manufactured by Shin-Tack Chemical Co., Ltd. (a PET film with an easily-adhesive layer manufactured by Toyobo). (A4300 # 100)).

(Adhesive strength of second adhesive layer)
The first release sheet of a double-sided pressure-sensitive adhesive sheet with a release sheet in which a first release sheet / first pressure-sensitive adhesive layer / second pressure-sensitive adhesive layer / second release sheet is laminated in this order is peeled off and easily adhered. A polyethylene terephthalate film with a layer (A4300 # 100, manufactured by Toyobo) was adhered as a backing substrate. The second release sheet was peeled off, and the adhesive surface of the second adhesive layer was adhered to soda glass. Twenty-four hours after the adhesion, the adhesive strength was measured under the conditions of a peeling speed of 300 mm / min and a peeling angle of 180 ° according to Method 1 of JIS Z 0237.

<Interfacial adhesive strength>
The first release sheet of the double-sided pressure-sensitive adhesive sheet with a release sheet is peeled from the first pressure-sensitive adhesive layer, and a polyethylene terephthalate film with an easy-adhesion layer (A4300 # 100, manufactured by Toyobo) backed on the first pressure-sensitive adhesive layer surface (First backing substrate). Subsequently, the second release sheet was released from the second pressure-sensitive adhesive layer, and the surface of the second pressure-sensitive adhesive layer was subjected to a surface activation treatment. A polyethylene terephthalate film with an easy-adhesion layer, in which an acrylic pressure-sensitive adhesive layer also subjected to a surface activation treatment is adhered to the surface of the second pressure-sensitive adhesive layer, as a backing substrate (second backing substrate) did. The polyethylene terephthalate film with an easy-adhesion layer to which the surface-activated acrylic pressure-sensitive adhesive layer was adhered was used as an acrylic adhesive layer having a CCL / D1 / T3T3 manufactured by Shin-Tack Chemical Co., Ltd. (a PET film with an easily-adhesive layer manufactured by Toyobo). (A4300 # 100)). The double-sided pressure-sensitive adhesive sheet with a double-sided backing substrate obtained above was cut into 50 mm × 100 mm, and the surface of the first backing substrate opposite to the surface of the pressure-sensitive adhesive layer was fixed. 24 hours after adhering the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer, the second backing substrate is peeled off, so that the interfacial adhesive force between the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer is removed. Was measured under the conditions of a peeling speed of 300 mm / min and a peeling angle of 180 ° according to Method 1 of JIS Z 0237. When an interface other than the interface between the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer peels off, the adhesive force between the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer is defined as the peeling force or more. did.

<Measurement of peeling force>
(Release force of first release sheet)
A double-sided pressure-sensitive adhesive sheet with a release sheet in which a first release sheet / first pressure-sensitive adhesive layer / second pressure-sensitive adhesive layer / second release sheet is laminated in this order is cut out to 50 mm × 100 mm, and the first release sheet is cut out. Was peeled off at a peeling speed of 300 mm / min and a peeling angle of 180 ° according to JIS Z 0237 Method 1, and the peeling force was measured.

(Release force of the second release sheet)
A double-sided pressure-sensitive adhesive sheet with a release sheet in which a first release sheet / first pressure-sensitive adhesive layer / second pressure-sensitive adhesive layer / second release sheet is laminated in this order is cut out to 50 mm × 100 mm, and the first release sheet is cut out. Was peeled off, and a PET film (A4300 # 100) with an easy-adhesion layer manufactured by Toyobo was adhered to the first adhesive layer as a backing substrate. Thereafter, the second release sheet was peeled off at a peeling rate of 300 mm / min and a peeling angle of 180 ° according to Method 1 of JIS Z 0237, and the peeling force was measured.

<Peeling load>
The second release sheet of the double-sided pressure-sensitive adhesive sheet with a release sheet was peeled off, and the surface of the second release sheet to which the release agent was applied was No. No. It was stuck on the adhesive layer surface of No. 100 and left at room temperature for 24 hours. Thereafter, the peeling force when the second release sheet was peeled at 180 ° peeling at a peeling speed of 300 m / min was measured and defined as a peeling load.

<Evaluation of workability>
When the peel force of the first release sheet was measured, when 95% or more of the area of the second release sheet was not released from the second pressure-sensitive adhesive layer surface, the workability was evaluated as good (O). When the area exceeding 5% of the second release sheet was peeled off from the second pressure-sensitive adhesive layer, the workability was poor (x).

<Evaluation of air release>
The first release sheet of the double-sided pressure-sensitive adhesive sheet with a release sheet is peeled from the first pressure-sensitive adhesive layer, and the surface of the first pressure-sensitive adhesive layer is rolled on a Matsunami glass plate (product name: S9112, 1 mmt × 76 mm × 52 mm) by 2 kg roll. And made one reciprocation. Next, the second release sheet was peeled off, gently placed on a soda glass plate so that the second pressure-sensitive adhesive layer surfaces directly overlapped, and adhered by its own weight. At this time, air bleeding was extremely good when the area of bubbles remaining at the interface between the second pressure-sensitive adhesive layer and soda glass was 2% or less of the adhered area (（). Good air permeability (O): More than 5% was defined as poor air bleed (X).

  The double-sided pressure-sensitive adhesive sheet with a release sheet obtained in the example was capable of peeling the first release sheet first, and was excellent in workability. Further, the double-sided pressure-sensitive adhesive sheet with a release sheet obtained in the example was obtained. When the second pressure-sensitive adhesive layer was stuck to the adherend, air entrapment was suppressed. On the other hand, the double-sided PSA sheet with a release sheet obtained in Comparative Example was not compatible with both processability and air bleeding property.

10 First pressure-sensitive adhesive layer 12 Second pressure-sensitive adhesive layer 20 First release sheet 22 Second release sheet 50 Double-sided pressure-sensitive adhesive sheet 100 Double-sided pressure-sensitive adhesive sheet with release sheet

Claims (7)

A first release sheet, a first pressure-sensitive adhesive layer, a second pressure-sensitive adhesive layer, and a second release sheet is a double-sided pressure-sensitive adhesive sheet with a release sheet laminated in this order,
The second pressure-sensitive adhesive layer is directly laminated on the first pressure-sensitive adhesive layer,
The first pressure-sensitive adhesive layer has a glass adhesive strength of 10 to 1000 times the glass adhesive strength of the second pressure-sensitive adhesive layer,
A release sheet, wherein a release force when peeling the second release sheet from the second pressure-sensitive adhesive layer is larger than a release force when peeling the first release sheet from the first pressure-sensitive adhesive layer. With double-sided adhesive sheet.   The double-sided pressure-sensitive adhesive sheet with a release sheet according to claim 1, wherein the interface pressure between the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer is 1 N / 25 mm or more.   The adhesive force with respect to glass of the said 1st adhesive layer is 1-50N / 25mm, and the adhesive force with respect to glass of the said 2nd adhesive layer is 0.01-1N / 25mm, The Claim 1 or 2 characterized by the above-mentioned. Double-sided PSA sheet with release sheet.   The double-sided PSA sheet with a release sheet according to any one of claims 1 to 3, wherein the first PSA layer is an acrylic PSA layer, and the second PSA layer is a silicone PSA layer. .   The double-sided PSA sheet with a release sheet according to any one of claims 1 to 4, wherein the first release sheet includes a silicone-based release agent.   The double-sided pressure-sensitive adhesive sheet with a release sheet according to any one of claims 1 to 5, wherein a release load of the second release sheet is 70 to 20,000 mN / 50 mm. Forming a first pressure-sensitive adhesive layer on the first release sheet, and forming a second pressure-sensitive adhesive layer on the second release sheet;
Laminating the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer so as to be in contact with each other, a method for producing a double-sided pressure-sensitive adhesive sheet with a release sheet,
The first pressure-sensitive adhesive layer has a glass adhesive strength of 10 to 1000 times the glass adhesive strength of the second pressure-sensitive adhesive layer,
A method for producing a double-sided PSA sheet with a release sheet, wherein the release force of the second release sheet is greater than the release force of the first release sheet.

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