JP7769411B2 - Composite, method for separating conductor from electrically peelable adhesive layer - Google Patents

Description

The present invention relates to a composite. The present invention relates to a method for separating a conductor from an electrically releasable adhesive layer.

Adhesives that can be peeled from an adherend by applying a voltage (hereinafter referred to as "electrically peelable adhesives") are known. For example, Patent Document 1 describes an electrically peelable adhesive sheet that leaves no adhesive residue even when a low voltage is applied.

Electroreleasable adhesives are used in the form of sheets or tapes with adhesive layers on both sides. For example, an electroreleasable adhesive can be placed between two objects to secure one object to the other. Here, when an electroreleasable adhesive is used to secure one object A to another object B, object A is called the object to be secured, and object B is called the adherend. By attaching the object to the adhesive surface of the electroreleasable adhesive and the adherend to their respective adhesive surfaces, the object can be secured to the adherend via the electroreleasable adhesive. When electrode terminals are connected to the adherend and the adherend and a voltage is applied, the electroreleasable adhesive loses its adhesive force at the surface that comes into contact with the object. As a result, the object can be separated from the adherend.

US Patent Application Publication No. 2022/0195259

The objective is to provide a new means for separating a fixed object from an electro-releasable adhesive.

The present invention provides the following inventions [1] to [28].
[1] An electrically releasable adhesive body comprising a substrate, a first electrically releasable adhesive layer on a first surface of the substrate, and a second electrically releasable adhesive layer on a second surface of the substrate;
a first conductor attached to the first electrically releasable adhesive layer;
a second conductor attached to the second electrically releasing adhesive layer;
a composite comprising a third conductor adhered to the second electrically releasable adhesive layer and insulated from the second conductor;

[2] Further comprising a power source;
a positive electrode of the power source is connected to the second conductor;
The composite according to [1] above, wherein the negative electrode of the power source is connected to the third conductor.

[3] A composite described in [1] or [2] above, in which no electrode is connected to the first conductor.

[4] A composite described in any one of [1] to [3] above, wherein the second conductor and the third conductor are insulated by air.

[5] A composite described in any one of [1] to [4] above, wherein the second conductor and the third conductor are insulated by an insulator adhered to the second electrically peelable adhesive layer.

[6] Further comprising a fourth conductor attached to the second electrically releasing adhesive layer,
the fourth conductor is insulated from the second conductor and the third conductor;
The composite according to any one of [1] to [5] above, wherein the negative electrode of the power source is connected to the fourth conductor.

[7] A composite described in any one of [1] to [6] above, wherein the composite has two or more electroreleasable adhesive bodies, and the second conductor and the third conductor are adhered to different electroreleasable adhesive bodies.

[8] A composite described in any one of [1] to [7] above, wherein the voltage of the power supply is 1 V or more and 100 V or less.

[9] A composite described in any one of [1] to [8] above, wherein at least one of the first electrically peelable pressure-sensitive adhesive layer and the second electrically peelable pressure-sensitive adhesive layer contains an acrylic polymer and an ionic liquid.

[10] The composite described in [9] above, wherein the content of the ionic liquid is 10 parts by weight or more and 90 parts by weight or less per 100 parts by weight of the acrylic polymer.

[11] The ionic liquid is represented by the following formula (1):
(In the formula, R ¹ is a divalent hydrocarbon group having 2 to 8 carbon atoms which may contain a heteroatom, and forms a ring together with N ⁺ in the formula,
^R2 and ^R3 are the same or different and each represent a hydrogen atom or an alkyl group having 1 to 6 carbon atoms (however, when a nitrogen atom forms a double bond with an adjacent carbon atom, ^R3 does not exist),
X ^- is _an anion selected from Cl ^- , Br ^- , I ^- , _AlCl4 ^- , _Al2Cl7 -, _NO3 ^- , _BF4 ^- , _PF6 ^{- ,} _ClO4 ^- , _{CH3COO- , CF3COO-} , _CF3SO3 ^- , ( _CF3SO2 ) _{2N- ,} ( _FSO2 ⁾ _2N- ^, ( _CF3SO2 ) _3C- ^, _AsF6- ^{, SbF6-} _{, NbF6-} ^, _F ⁽ _HF ⁾ _n- ^, B _{( C6H5} ) _{4- , C4F9SO3-} , _{CF3 ( CF2 ) 3SO3-} ^{, (} _{CF3CF2SO2 ) 2N- and} ^CF3CF2COO- _.
The complex according to the above [9] or [10],

[12] A composite described in any one of [9] to [11] above, wherein the acrylic polymer comprises a copolymer of an alkyl (meth)acrylate having an alkyl group having 1 to 8 carbon atoms, a carboxyl group-containing acrylic monomer, and/or a hydroxyl group-containing acrylic monomer.

[13] The composite according to any one of [9] to [12] above, wherein the substrate has a basis weight of 10.0 g/m ² or less and a thickness of 10 μm or more and 50 μm or less.

[14] A composite described in any one of [9] to [13] above, wherein at least one of the first electrically peelable adhesive layer and the second electrically peelable adhesive layer further contains a migration promoter.

[15] The complex described in [14] above, wherein the migration promoter is an alkyl ether of polyethylene glycol.

[16] An electrically releasable adhesive layer;
a first conductor attached to a first adhesive surface of the electrically releasable adhesive layer;
a second conductor attached to a second adhesive surface of the electrically releasable adhesive layer;
a composite comprising a third conductor attached to the second adhesive surface and insulated from the second conductor;

[17] Further comprising a power source;
a positive electrode of the power source is connected to the second conductor;
The composite according to [16] above, wherein the negative electrode of the power source is connected to the third conductor.

[18] A composite described in [17] above, in which no electrode is connected to the first conductor.

[19] An electrically releasable adhesive body comprising a substrate, a first electrically releasable adhesive layer on a first surface of the substrate, and a second electrically releasable adhesive layer on a second surface of the substrate;
a first conductor attached to the first electrically releasable adhesive layer;
a second conductor attached to the second electrically releasing adhesive layer;
a composite comprising a third conductor adhered to the second electrically releasing pressure sensitive adhesive layer and insulated from the second conductor,
A method for separating a conductor from an electrically releasable adhesive layer, comprising the step of applying a voltage between the second conductor and the third conductor.

[20] The method described in [19] above, further comprising a step of forming a complex.

[21] A method described in [19] or [20] above, wherein a voltage is not applied directly to the first conductor.

[22] The device further comprises a fourth conductor attached to the second electrically releasing adhesive layer,
the fourth conductor is insulated from the second conductor and the third conductor;
The method according to any one of [19] to [21] above, wherein a voltage is also applied to the fourth conductor when the voltage is applied.

[23] A method described in any one of [19] to [22] above, wherein the composite has two or more electroreleasable adhesive bodies, and the second conductor and the third conductor are attached to different electroreleasable adhesive bodies.

[24] A method described in any one of [19] to [23] above, wherein the applied voltage is 1 V or more and 100 V or less.

[25] A method described in any one of [19] to [24] above, wherein the voltage application time is 1 second or more and 600 seconds or less.

[26] The method described in any one of [19] to [25] above, wherein at least one of the first electrically peelable pressure-sensitive adhesive layer and the second electrically peelable pressure-sensitive adhesive layer contains an acrylic polymer and an ionic liquid.

[27] The method described in any one of [19] to [26] above, wherein at least one of the first electrically peelable adhesive layer and the second electrically peelable adhesive layer further contains a migration promoter.

[28] The method described in [27] above, wherein the migration promoter is an alkyl ether of polyethylene glycol.

The present invention provides a new method for separating a conductor from an electro-releasable adhesive.

1 is a schematic diagram of an electroreleasable adhesive body. FIG. 1 is a diagram showing an example of a cross section of a composite (composite 1) comprising an electrically releasable adhesive (referred to as an adhesive), a first conductor adhered to a first electrically releasable adhesive layer of the adhesive, and a second conductor and a third conductor adhered to a second electrically releasable adhesive layer of the adhesive. 1 is a diagram showing an example of a circuit in which electrode terminals are connected to a second conductor and a third conductor of a composite body 1. FIG. FIG. 1 is a diagram showing an example in which a voltage is applied to a composite 1. FIG. 10 is a diagram showing an example in which a third conductor is separated from a composite body 1. FIG. 1 is a diagram showing a conventional circuit in which electrode terminals are connected to a first conductor and a second conductor of a composite body 1. FIG. 10 is a diagram showing an example in which a voltage is applied to a conventional circuit to separate a second conductor from the composite. FIG. 1 is a diagram showing an example of a cross section of a composite (composite 2) comprising an adhesive body, a first conductor adhered to a first electrically releasable adhesive layer of the adhesive body, and a second conductor, a third conductor, and an insulator adhered to an electrically releasable adhesive layer of a second adhesive body of the adhesive body. 10 is a diagram showing an example of a circuit in which electrode terminals are connected to the second and third conductors of the composite 2. FIG. FIG. 10 is a diagram showing an example in which the third conductor is separated from the composite body 2. FIG. 1 is a diagram showing an example of a cross section of a composite (composite 3) comprising an adhesive body, a first conductor adhered to a first electrically peelable adhesive layer of the adhesive body, and a second conductor, a third conductor, a fourth conductor and two insulators adhered to a second electrically peelable adhesive layer of the adhesive body. FIG. 10 is a diagram showing an example of a circuit in which electrode terminals are connected to the second conductor, the third conductor, and the fourth conductor of the composite 3. FIG. 10 is a diagram showing an example in which the third conductor and the fourth conductor are separated from the composite body 3. FIG. 1 is a diagram showing an example of a cross section of a composite (composite 4) comprising two adhesive bodies, a first conductor adhered to both of the first electrically releasable adhesive layers of the two adhesive bodies, and a second conductor and a third conductor adhered to the second electrically releasable adhesive layers of the two adhesive bodies, respectively. 10 is a diagram showing an example of a circuit in which electrode terminals are connected to the second and third conductors of the composite 4. FIG. FIG. 10 is a diagram showing an example in which the third conductor is separated from the composite body 4. FIG. 1 is a top view of a composite (composite 5) comprising an adhesive body, a first conductor adhered to a first electrically releasable adhesive layer of the adhesive body, a second conductor adhered to a second electrically releasable adhesive layer of the adhesive body, a third conductor, and an insulator having two through holes. 6B is a cross-sectional view of the composite 5 shown in FIG. 6A along the dotted line. FIG. 10 is a diagram showing an example of a circuit in which electrode terminals are connected to the second and third conductors of the composite 5. FIG. FIG. 10 is a diagram showing an example in which the third conductor is separated from the composite 5. FIG. 1 is a diagram showing an example of a cross section of a composite (composite 6) comprising an adhesive body, a conductive auxiliary material adhered to a first electrically peelable adhesive layer of the adhesive body, an insulator adhered to the conductive auxiliary material, and a second conductor, a third conductor, and an insulator adhered to a second electrically peelable adhesive layer of the adhesive body. 10 is a diagram showing an example of a circuit in which electrode terminals are connected to the second and third conductors of the composite 6. FIG. FIG. 10 is a diagram showing an example in which the third conductor is separated from the composite 6. This is a diagram showing an example of a cross section of a composite (composite 7) comprising an adhesive body, a first conductor adhered to the first electrically releasable adhesive layer of the adhesive body, two conductive auxiliary materials adhered to the second electrically releasable adhesive layer of the adhesive body, and two insulators adhered to each of the two conductive auxiliary materials. FIG. 10 is a diagram showing an example of a circuit in which electrode terminals are connected to two conductive auxiliary members of a composite body 7. FIG. 10 is a diagram showing an example in which the third conductor is separated from the composite 7. This is a diagram showing an example of a cross section of a composite (composite 8) comprising an adhesive body, a conductive auxiliary material adhered to the first electrically peelable adhesive layer of the adhesive body, an insulator adhered to the conductive auxiliary material, two conductive auxiliary materials adhered to the second electrically peelable adhesive layer of the adhesive body, and two insulators adhered to each of the two conductive auxiliary materials. FIG. 10 is a diagram showing an example of a circuit in which electrode terminals are connected to two conductive auxiliary members of a composite body 8. FIG. 10 is a diagram showing an example in which the third conductor is separated from the composite body 8. FIG. 2 is a diagram showing an electrically peelable pressure-sensitive adhesive layer and a first adhesive surface and a second adhesive surface of the electrically peelable pressure-sensitive adhesive layer. FIG. 1 is a diagram showing an example of a cross section of a composite (composite 9) comprising an electrically peelable pressure-sensitive adhesive layer, a first conductor adhered to a first adhesive surface of the electrically peelable pressure-sensitive adhesive layer, and a second conductor and a third conductor adhered to a second adhesive surface of the electrically peelable pressure-sensitive adhesive layer. 10 is a diagram showing an example of a circuit in which electrode terminals are connected to the second and third conductors of the composite 9. FIG. 10 is a diagram showing an example in which the third conductor is separated from the composite 9. FIG.

[Complex]
In this embodiment, a composite body is provided that includes an electro-releasable adhesive body (hereinafter also simply referred to as an adhesive body), a first conductor, a second conductor, and a third conductor.

An electro-releasable adhesive comprises a planar substrate, a first electro-releasable adhesive layer formed on the first surface of the substrate, and a second electro-releasable adhesive layer formed on the second surface of the substrate, and possesses electro-releasability. "Electro-releasability" refers to the property of being able to separate an electrically conductive material attached to an adhesive by applying a voltage to the adhesive, thereby reducing the adhesive's adhesiveness. A schematic diagram of the adhesive's structure is shown in Figure 1. In Figure 1, 10 represents the electro-releasable adhesive, 11 the first electro-releasable adhesive layer, 12 the second electro-releasable adhesive layer, and 13 the substrate. Although not included in Figure 1, in the following drawings, 1 represents the first conductor, 2 the second conductor, 3 the third conductor, 4 the fourth conductor, 20 the insulator, 30 the conductive auxiliary material, 40 the electro-releasable adhesive layer, and 100 the DC power source. The terms used to construct the adhesive and composite are explained below.

A composite is formed by applying a first conductor, a second conductor, and a third conductor to the adhesive body. An example of a composite is shown in Figure 2A. Figure 2A shows a cross section of a composite placed with the first conductor at the bottom, cut vertically (the same applies to other examples below). Figure 2A shows a composite (composite 1) in which the first conductor is applied to the first electrically releasable adhesive layer of the adhesive body, the second conductor and the third conductor are applied to the second electrically releasable adhesive layer, and the second conductor and third conductor are further insulated from each other by air.

Figure 2B shows the composite 1 connected to a DC power supply. In Figure 2B, the terminals of the two electrodes extending from the DC power supply are connected to the second and third conductors, respectively, but not to the first conductor. Figure 2C shows the state after the DC power supply in Figure 2B is turned on and a voltage is applied. As shown in Figure 2C, the second and third conductors apply a voltage via the adhesive body and first conductor. At this time, current flows from the second conductor to the adhesive body and the first conductor in the Y-axis direction of Figure 2C. Then, the current flows through the first conductor in the X-axis direction of Figure 2C, then passes through the adhesive body again and through the third conductor. This causes electrical peeling between the third conductor and the adhesive body, separating the third conductor from the composite 1 as shown in Figure 2D. Note that when voltage is applied, no current flows through the adhesive body in the X-axis direction of Figure 2C. Therefore, although the second conductor and the third conductor are in contact with each other via the adhesive, they are insulated from each other by air. The first conductor and the second conductor, and the first conductor and the third conductor are in a state where they can conduct electricity via the adhesive, so that electricity can flow when a voltage is applied.

Previously, it was thought that achieving electrodetachment in an electrodetachable adhesive required connecting electrode terminals to a first conductor and a second conductor located on different sides of the composite 1, as shown in Figure 2E, and applying a voltage. In this case, as shown in Figure 2F, current flows through the first and second conductors in the Y-axis direction of Figure 2F. Electrodetachment occurs in the second conductor, causing it to separate from the composite, and no current flows through the third conductor. Surprisingly, the inventors have newly discovered that connecting electrode terminals to second and third conductors located on the same side of an adhesive and applying a voltage can separate the third conductor. This was previously unknown. This allows electrodetachment to occur, separating the attached conductors, even under conditions where attaching an electrode terminal to the first conductor was previously difficult. Furthermore, the adhesive used in the present invention recovers its adhesiveness over time after application of electricity. This allows a conductor to be attached to the adhesive again after adhesion is restored, and electrical current can be applied at any time to cause electrodetachment again. In this case, for example, an adhesive body is attached to a first conductor on a workbench or the like, and then conductors (second conductor, third conductor) such as metal products before processing are attached to this adhesive body. Then, electricity is passed through the processed metal products to separate them, and this process can be repeated. This improves work efficiency while allowing the adhesive body used for attachment to be reused, thereby reducing the cost of attaching conductors.

Another example of the separation method of the present invention is shown in Figures 3A-C. In the composite (composite 2) of Figure 3A, an insulator is adhered between the second conductor and the third conductor of composite 1. The insulator contacts the second conductor and the third conductor, respectively. Figure 3B shows an embodiment in which electrode terminals are connected to the second conductor and the third conductor. By forming a circuit as shown in Figure 3B and applying a voltage, electrical peeling occurs at the contact surface between the adhesive body and the third conductor, and the third conductor can be separated from composite 2 (see Figure 3C). In this case, as in Figure 2C, current flows through the second conductor, adhesive body, first conductor, and third conductor. Therefore, no current flows through the insulator, and electrical peeling does not occur. Furthermore, no current flows between the second conductor and the third conductor and the insulator.

Another example of the separation method of the present invention is shown in Figures 4A to 4C. The composite (composite 3) in Figure 4A is formed by adhering a first conductor to the first electrically releasing adhesive layer of the adhesive body, and by adhering a second, third, and fourth conductors and two insulators to the second electrically releasing adhesive layer. In the composite, each of the three conductors is in contact with an insulator, and the three conductors are not in direct contact with each other. Figure 4B shows an embodiment in which electrode terminals are connected to the three conductors of composite 3. In Figure 4B, one second conductor is connected to the positive electrode side, and the third and fourth conductors are connected to the negative electrode side. By forming a circuit as shown in Figure 4B and applying a voltage, electrical peeling occurs at the contact surfaces between the adhesive body and the third conductor and between the adhesive body and the fourth conductor, and the third and fourth conductors can be separated from composite 3 (see Figure 4C). In Figure 4C, the two conductors on the negative electrode side have separated from the composite, but by changing the connection of the electrode terminals, it is possible to appropriately change which conductors and how many conductors detach from the composite.

Another example of the separation method of the present invention is shown in Figures 5A-C. The composite (composite 4) in Figure 5A is formed by attaching two adhesive bodies to a first conductor, and then attaching a second conductor and a third conductor to each of the two adhesive bodies. Figure 5B shows an embodiment in which electrode terminals are connected to each of the two conductors of composite 4. In Figure 5B, the two conductors are insulated by air. By forming a circuit as shown in Figure 5B and applying a voltage, electrical separation occurs at the contact surface between the adhesive body and the third conductor, allowing the third conductor to be separated from composite 4 (see Figure 5C). In this case, current flows from the second conductor to the adhesive body (the side in contact with the second conductor), the first conductor, the adhesive body (the side in contact with the third conductor), and the third conductor. In this way, even when multiple adhesive bodies are used, current can be passed through the first conductor to separate the conductors.

Another example of the separation method of the present invention is shown in Figures 6A to 6D. Figure 6A is a top view of the composite (composite 5), and Figure 6B is a cross-sectional view of the dotted line portion of composite 5 in Figure 6A. Composite 5 in Figure 6A is formed as follows. First, a first conductor is attached to the first electrically releasing adhesive layer of the adhesive body. Next, an insulator with two through holes is attached to the second electrically releasing adhesive layer of the adhesive body. Then, a second conductor and a third conductor having the exact same size as the two through holes are inserted into the through-hole portions of the insulator and attached to the second electrically releasing adhesive layer of the adhesive body, thereby forming composite 5.
In composite 5, the two conductors are in contact with the adhesive body and the insulator, but are not in contact with each other. Figure 6C shows an embodiment in which electrode terminals are connected to the two conductors of composite 5. By forming a circuit as shown in Figure 6C and applying a voltage, electrical peeling occurs at the contact surface between the adhesive body and the third conductor, and the third conductor can be separated from composite 5 (see Figure 6D).

Another example of the separation method of the present invention is shown in Figures 7A-C. The composite (composite 6) in Figure 7A is formed as follows. First, a conductive auxiliary material is attached to an insulator. When a conductive auxiliary material is attached to an insulator, electricity can flow through the conductive auxiliary material. Therefore, the configuration in which the conductive auxiliary material is attached to the insulator can be considered a first conductor. Next, the above-mentioned first conductor (the configuration in which the conductive auxiliary material is attached to the insulator) is attached to the first electrically releasable adhesive layer of the adhesive body. Then, the second conductor, third conductor, and insulator are attached to the second electrically releasable adhesive layer of the adhesive body. At this time, the second conductor, third conductor, and insulator are attached to the adhesive body so that the second conductor and the third conductor are not in direct contact with each other and the insulator is in contact with the second conductor and third conductor, thereby forming composite 6. Figure 7B shows an embodiment in which electrode terminals are connected to the second conductor and third conductor of composite 6. By forming a circuit as shown in Figure 7B and applying a voltage, electrical peeling occurs at the contact surface between the adhesive body and the third conductor, and the third conductor can be separated from the composite 6 (see Figure 7C). In this way, even if an insulator is used, it can be treated as a conductor by using a conductive auxiliary material to form a composite, and the conductor can be separated from the composite. The conductive auxiliary material can be adhered to the insulator with any adhesive.

Another example of the separation method of the present invention is shown in Figures 8A-C. The composite (composite 7) in Figure 8A is formed as follows. First, a first conductor is attached to the first electrically releasable adhesive layer of the adhesive body. Next, two conductive auxiliary materials are attached to the second electrically releasable adhesive layer of the adhesive body. Then, an insulator is attached to each of the two conductive auxiliary materials to form composite 7. In composite 7, by combining the insulator with a conductive auxiliary material, these can be considered as the second and third conductors, respectively. Figure 8B shows an embodiment in which electrode terminals are connected to each of the two conductive auxiliary materials of composite 7. As shown in Figure 8B, by connecting a DC power source to the two conductive auxiliary materials and applying a voltage, electrical peeling occurs at the contact surface between the adhesive body and the third conductor (the contact surface between the conductive auxiliary material and the adhesive), and the third conductor can be separated from composite 7 (see Figure 8C). In this way, even if the insulator is an insulator, the use of a conductive auxiliary material allows it to be considered as a conductor to form a composite, and the insulator can be separated from the composite. The insulator can be attached to the conductive auxiliary material with any adhesive.

Another example of the separation method of the present invention is shown in Figures 9A-C. The composite (composite 8) in Figure 9A is formed as follows. First, a conductive auxiliary material is attached to an insulator. When a conductive auxiliary material is attached to an insulator, electricity can flow through the conductive auxiliary material, and the structure in which the conductive auxiliary material is attached to the insulator can be considered a first conductor. Next, the above-mentioned first conductor (the structure in which the conductive auxiliary material is attached to the insulator) is attached to the first electrically releasable adhesive layer of the adhesive body. Next, two conductive auxiliary materials are attached to the second electrically releasable adhesive layer of the adhesive body. Then, an insulator is attached to each of the two conductive auxiliary materials to form composite 8. In composite 8, by combining the insulator with a conductive auxiliary material, these can be considered a second conductor and a third conductor, respectively. Figure 9B shows an embodiment in which electrode terminals are connected to each of the two conductive auxiliary materials of composite 8. As shown in Figure 9B, by connecting a DC power supply to the two conductive auxiliary materials and applying a voltage, electrical peeling occurs at the contact surface between the adhesive body and the third conductor (the contact surface between the conductive auxiliary material and the adhesive body), and the third conductor can be separated from the composite 8 (see Figure 9C).

As shown in the examples above, in the composite of the present invention, there is no need to connect an electrode to the first conductor, and the third conductor can be separated from the composite without applying a voltage directly to the first conductor.

The voltage applied to the composite is not particularly limited as long as it can cause electro-detachment in the composite, but a low voltage is preferable considering the size of the voltage application device, the effect on conductors, and the risk to humans due to accidents during work. The upper limit of the applied voltage can be selected from, for example, 690V, 650V, 600V, 550V, 500V, 480V, 450V, 415V, 400V, 380V, 350V, 347V, 300V, 250V, 240V, 230V, 220V, 210V, 208V, 200V, 180V, 160V, 150V, 130V, 125V, 120V, 115V, 110V, 105V, 100V, 90V, 80V, 70V, 60V, 50V, 40V, and 30V. The lower limit of the voltage can be selected from, for example, 0.5 V, 1 V, 2 V, 3 V, 4 V, 5 V, 6 V, 7 V, 8 V, 9 V, and 10 V. The applied voltage is preferably 1 V or more and 100 V or less, more preferably 1 V or more and 50 V or less, and even more preferably 5 V or more and 30 V or less.

The duration of voltage application is not particularly limited as long as it is capable of causing electrical peeling in the composite, but is preferably from 1 second to 600 seconds, more preferably from 1 second to 300 seconds, more preferably from 1 second to 180 seconds, and even more preferably from 1 second to 90 seconds.

There is no specific temperature requirement for peeling, but it is preferable to perform the peeling at room temperature.

The first conductor refers to a conductor attached to the first electroreleasable adhesive layer of the adhesive and providing a location for the second, third, and fourth conductors to be attached via the adhesive. The second, third, and fourth conductors refer to conductors attached to the second electroreleasable adhesive layer of the adhesive. The first, second, third, and fourth conductors may be made of the same or different materials. In addition to the second, third, and fourth conductors, other conductors may also be attached to the second electroreleasable adhesive layer. Such conductors are referred to as the fifth, sixth, etc. The number of conductors attached to the second electroreleasable adhesive layer is not particularly limited. For example, the number of conductors attached to the second electroreleasable adhesive layer may be 2, 3, 4, 5, 6, 7, 8, 9, or 10. These fifth and sixth conductors can be treated in the same way as the second, third, and fourth conductors. When electrodes are attached to the composite to form a circuit, the conductor attached to the positive electrode of the conductors attached to the second electrically peelable pressure-sensitive adhesive layer of the pressure-sensitive adhesive body becomes the second conductor. It is preferable not to apply a voltage directly to the first conductor.

Examples of the first conductor include metal plates, metal products, and metal workbenches made of metals such as iron, aluminum, copper, silver, and gold, or alloys of these metals. Of these, the first conductor is preferably a material with a resistance value of 1000 Ω/sq or less. Examples of the second, third, and fourth conductors include metal plates, metal products, foils (thickness less than 100 μm), and plates (thickness 100 μm or more) made of metals such as iron, aluminum, copper, silver, and gold, or alloys of these metals; meshes or fabrics containing fibers mixed with or coated with these metals or alloys; resin sheets containing these metals or alloys; and resin plates with layers containing these metals, alloys, or conductive metal oxides. Examples of the metal products include metal cases enclosing batteries, metal vehicle parts, electronic components such as circuit boards, etc.

Conductive auxiliary materials are not particularly limited as long as they are conductive, and examples include films vapor-deposited with metals such as aluminum, copper, silver, gold, or alloys of these metals, or conductive metal oxides (such as indium tin oxide: ITO), fabrics containing fibers mixed with or coated with these metals or alloys, resin sheets containing these metals or alloys, and resin plates with a layer containing these metals, alloys, or conductive metal oxides.

The composite may be provided with an insulator. Electricity will not flow through the insulator even when it is in contact with a conductor. Therefore, even materials or devices that should not allow electricity to flow can be attached to the composite and the electrostripping operation can be performed. Examples of insulators include wooden plywood, plastic products, and non-metallic workbenches.

In the composite, the second conductor, the third conductor, and the fourth conductor are each insulated. The insulation may be by the insulators described above, or by air.

Insulators cannot be used as conductors because they cannot conduct electricity as they are. By attaching a conductive auxiliary material, the insulator can be used as a conductor. In this embodiment, the insulator with the conductive auxiliary material attached is considered to be the first conductor, second conductor, third conductor, and/or fourth conductor. When using an insulator as the second conductor, third conductor, or fourth conductor, the operation of connecting the electrode terminal to the second conductor, third conductor, or fourth conductor is an operation of connecting to the conductive auxiliary material attached to the second conductor, third conductor, or fourth conductor. When attaching the conductive auxiliary material, any adhesive, such as a commercially available adhesive, can be used.

By connecting electrodes to at least two of the conductors attached to the second electro-releasable adhesive layer of the composite and applying a voltage between the two electrodes, the two conductors become electrically conductive via the adhesive and the first conductor. This causes electrical peeling, allowing the conductor on the negative side of the conductors attached to the second electro-releasable adhesive layer to separate from the composite. The peeling state after electrical current application can be adjusted appropriately by how the electrode terminals are connected to the conductors. For example, if the composite has two conductors attached to the second electro-releasable adhesive layer, switching the positive and negative electrodes allows you to select which conductor will separate. If the composite has three conductors attached to the second electro-releasable adhesive layer, adjusting the wiring to the power source and the number of conductors on the negative side allows you to select which conductor will separate, and whether one or two of the three conductors will separate. The same applies when there are four or more conductors attached to the second electro-releasable adhesive layer.

The shapes of the conductors, insulators, conductive auxiliary materials, and adhesives used in the composite are not particularly limited, as long as they can form the composite and can be made electrically conductive by connecting electrodes.

(electrically peelable adhesive)
The adhesive body of this embodiment is a planar object comprising a substrate, a first electrically releasing adhesive layer on a first surface of the substrate, and a second electrically releasing adhesive layer on a second surface of the substrate. The first electrically releasing adhesive layer and the second electrically releasing adhesive layer each have adhesive properties in part or in whole. The adhesive body of the present invention may take the form of, for example, a double-sided sheet or a double-sided tape. It is preferable that the adhesive body has an adhesive strength of 5 N/25 mm or more before application of a voltage.

A substrate refers to a planar object onto which an electro-releasable adhesive can be applied to form an adhesive layer, or which can form an adhesive layer together with an electro-releasable adhesive. There are no particular restrictions on the substrate, as long as the adhesive layer is ionically conductive when a voltage is applied to the adhesive sheet. The substrate does not have to be completely flat, and may have some or all of its surface unevenness. The substrate may also have at least one through-hole.

Examples of the substrate include foils or plates made of metals such as aluminum, copper, silver, and gold, or alloys of these metals; plant fibers; inorganic and chemical fibers; and porous films. Among these, fibers are preferred, and plant fibers are even more preferred. Examples of substrates made of plant fibers include Western paper and Japanese paper. Examples of substrates made of inorganic and chemical fibers include nonwoven or woven fabrics such as polyester (particularly polyethylene terephthalate nonwoven fabrics), carbon fibers, and glass fibers. Examples of porous films include polyimide and polyester films. The electrically releasing adhesive can penetrate the gaps between fibers and the pores in porous films, allowing the adhesive layer to be ionically conductive while forming a thin adhesive sheet. The substrate is preferably made of fibers made of an insulating material. Examples of insulating fibers include plant fibers and polyester fibers.

The thickness of the substrate is not particularly limited, but is, for example, 5 μm or more and 50 μm or less, and preferably 10 μm or more and 40 μm or less. The upper limit of the substrate thickness is, for example, 50, 45, or 40 μm. The lower limit of the substrate thickness is, for example, 5, 7, 10, 12, or 15 μm.

The basis weight of the substrate is not particularly limited, but is, for example, 50 g/ ^m² or less, preferably ² g/m² to 30 g/ ^m² or less, more preferably 2 g/ ^m² to 20 g/ ^m² or less, more preferably 2 g/m² to 15 g/ ^m² or less, and even more preferably 2 g/m² to ¹⁰ g/ ^m² or less. The upper limit of the basis weight is, for example, 50, 40, 30 ^{, 20} , or ¹⁰ g/m². The lower limit of the basis weight is, for example, 2.0, 2.5, 3.0, 4.0, or 5.0 g/ ^m² . In particular, it is particularly preferable for the substrate to have a basis weight of 10.0 g/ ^m² or less and a thickness of 10 μm to 35 μm. By having such a basis weight and thickness, it is possible to obtain a thin adhesive body without affecting the electro-separation properties.

The thickness of the adhesive is not particularly limited, but is preferably 1 μm or more and 200 μm or less, more preferably 10 μm or more and 150 μm or less, and even more preferably 10 μm or more and 100 μm or less. The upper limit of the thickness of the adhesive sheet is, for example, 200, 150, 100, or 90 μm. The lower limit of the thickness of the adhesive is, for example, 1, 3, 5, 10, 15, 20, 25, or 30 μm.

The thickness of the adhesive body or substrate can be measured using a known thickness measuring device. An example of a thickness measuring device is a Peacock precision measuring instrument. Here, "thickness" refers to the average value measured using the thickness measuring device at at least five randomly selected locations on the object to be measured. The first and second electrically releasing adhesive layers are formed by forming an electrically releasing adhesive layer on each side of the substrate. The adhesive layer may consist solely of an electrically releasing adhesive that has permeated into the substrate. In this case, the first and second electrically releasing adhesive layers refer to the adhesive portions of the substrate surface.

(Composition of Electrically Releasable Adhesive)
The electroreleasable adhesive contains at least an optional adhesive and an electrolyte. The optional adhesive and electrolyte are contained in the electroreleasable adhesive so that the adhesive can be electrically peeled.

(adhesive)
Examples of the adhesive include an acrylic polymer, a polyester polymer, a polyurethane polymer, a silicone adhesive, a rubber adhesive, or a combination thereof. Of these, it is preferable that the adhesive contains at least an acrylic polymer, and it is more preferable that the adhesive consists of an acrylic polymer.

Acrylic polymers can be obtained by polymerizing acrylic monomers in the presence of a polymerization initiator. Any acrylic polymer can be used as long as it is suitable for use as an adhesive. From the perspective of adhesiveness, the weight-average molecular weight of the acrylic polymer is preferably 100,000 to 5,000,000, more preferably 200,000 to 4,000,000, and even more preferably 300,000 to 3,000,000. Here, the weight-average molecular weight refers to the weight-average molecular weight converted into polystyrene. Specifically, it may be the weight-average molecular weight converted into polystyrene calculated using Shodex GPC (System 21) with tetrahydrofuran as the mobile phase. The amount of acrylic polymer in the acrylic adhesive is not particularly limited, but is preferably 10 to 70% by weight, and more preferably 20 to 50% by weight, of the total weight of the adhesive.

The acrylic monomers that make up the acrylic polymer are not particularly limited, and known acrylic monomers used in pressure-sensitive adhesives can be used. Among these, alkyl (meth)acrylates are preferably included as acrylic monomers, and alkyl (meth)acrylates having an alkyl group with 1 to 14 carbon atoms are more preferred. The alkyl (meth)acrylates may account for 100% by weight of the total weight of the acrylic monomers included in the pressure-sensitive adhesive, preferably 40 to 100% by weight, more preferably 50 to 95% by weight, more preferably 70 to 95% by weight, and even more preferably 85 to 95% by weight. Note that (meth)acrylate refers to either methacrylate or acrylate.

Examples of alkyl (meth)acrylates include methyl (meth)acrylate, ethyl (meth)acrylate, n-propyl (meth)acrylate, isopropyl (meth)acrylate, n-butyl (meth)acrylate, sec-butyl (meth)acrylate, t-butyl (meth)acrylate, n-octyl (meth)acrylate, isooctyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, isononyl (meth)acrylate, and dodecyl (meth)acrylate. These alkyl (meth)acrylates may be used alone or in combination of two or more. Among these alkyl (meth)acrylates, alkyl (meth)acrylates having an alkyl group containing 1 to 8 carbon atoms are preferred, alkyl (meth)acrylates having an alkyl group containing 1 to 4 carbon atoms are more preferred, n-butyl (meth)acrylate is more preferred, and n-butyl acrylate is more preferred.

Examples of acrylic monomers other than alkyl (meth)acrylates include carboxyl group-containing (meth)acrylates such as acrylate, methacrylate, carboxyethyl (meth)acrylate, and carboxypentyl (meth)acrylate, and hydroxyl group-containing (meth)acrylates such as 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, 6-hydroxyhexyl (meth)acrylate, (4-hydroxymethylcyclohexyl)-methyl acrylate, 8-hydroxyoctyl (meth)acrylate, 10-hydroxydecyl (meth)acrylate, and 12-hydroxylauryl (meth)acrylate. These acrylic monomers other than alkyl (meth)acrylates may be used alone or in combination of two or more.

The amount of acrylic monomers other than alkyl (meth)acrylates is not particularly limited and may be 100% by weight of the total weight of acrylic monomers, but is preferably 1% by weight or more but less than 50% by weight, more preferably 5% by weight or more but less than 40% by weight, more preferably 5% by weight or more but less than 30% by weight, and even more preferably 5% by weight or more but less than 15% by weight.

The acrylic adhesive preferably contains, as the acrylic polymer, a copolymer of an alkyl (meth)acrylate having an alkyl group with 1 to 8 carbon atoms, a carboxyl group-containing acrylic monomer, and/or a hydroxyl group-containing acrylic monomer. When the acrylic polymer contains this copolymer, the adhesive has superior adhesive strength.

When an acrylic polymer contains a carboxyl group-containing monomer and/or a hydroxyl group-containing monomer, the total content of these two monomers is not particularly limited, but is preferably 1% by weight or more and 20% by weight or less of the total monomer amount, and more preferably 1% by weight or more and 10% by weight or less.

The glass transition temperature (Tg) of the acrylic polymer is preferably not higher than 0° C., more preferably not higher than −20° C., and even more preferably not higher than −40° C. Tg can be calculated, for example, based on the following Fox formula.

1/Tg=(W1/Tg1)+(W2/Tg2)+・・・・・・+(Wn/Tgn)

The glass transition temperature can be measured, for example, by differential thermal analysis (DTA).

Vinyl monomers may be added to the acrylic polymer as needed. Examples of vinyl monomers include itaconic acid, maleic acid, crotonic acid, maleic anhydride, itaconic anhydride, vinyl acetate, N-vinylpyrrolidone, N-vinylcarboxylic acid amides, styrene, and N-vinylcaprolactam. These vinyl monomers may be used alone or in combination of two or more.

The acrylic polymer may be crosslinked by the action of a crosslinking agent. Examples of crosslinking agents include isocyanate-based crosslinking agents such as toluene diisocyanate and methylene bisphenyl isocyanate. The amount of crosslinking agent is preferably 0.1 to 10 parts by weight, more preferably 0.3 to 10 parts by weight, and even more preferably 0.5 to 10 parts by weight, per 100 parts by weight of the acrylic polymer. Crosslinking the acrylic polymer can improve the creep resistance and/or shear resistance of the layer when the pressure-sensitive adhesive is formed as a layer on a substrate.

Examples of polyester polymers include polyester polymers obtained by polycondensation of polycarboxylic acids such as dicarboxylic acids and polyols such as diols. Examples of dicarboxylic acids include adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, phthalic acid, isophthalic acid, terephthalic acid, and cyclohexanedicarboxylic acid. Examples of diols include alkylene glycols, dialkylene glycols, polyalkylene glycols, and polyether glycols.

Examples of polyurethane-based polymers include polyurethane-based polymers obtained by reacting polyols with polyisocyanate compounds.

Examples of silicone-based adhesives include addition reaction type silicone-based adhesives, peroxide-curing type silicone-based adhesives, and condensation type silicone-based adhesives. Specific examples include dimethylsiloxane-based and diphenylsiloxane-based adhesives.

Examples of rubber-based adhesives include synthetic rubbers such as styrene-isoprene block copolymer, styrene-butadiene-styrene block copolymer, styrene-butadiene rubber, polyisoprene rubber, polyisobutylene, and butyl rubber, as well as natural rubber.

Examples of polymerization initiators used in polymer synthesis include 2,2'-azobisisobutyronitrile, 2,2'-azobis(2-methylpropionamidine) disulfide, 2,2'-azobis(4-methoxy-2,4-dimethylvaleronitrile), 2,2'-azobis(2,4-dimethylvaleronitrile), 2,2'-azobis(2-methylbutyronitrile), 1,1'-azobis(cyclohexane-1-carbonitrile), 2,2'-azobis(2,4,4-trimethylpentane), dimethyl-2,2'-azobis(2-methylpropionate), 2,2'-azobis[2-methyl-N-(phenylmethyl)-propionamidine]dihydrochloride, and 2,2'-azobis[2-(3,4,5,6-tetrahydropyrimidin-2-yl)propionamidine]dihydrochloride. Examples of polymerization initiators include azo-based polymerization initiators such as [2-(2-imidazolin-2-yl)propane]dihydrochloride and 2,2'-azobis[2-(2-imidazolin-2-yl)propane]; persulfate-based polymerization initiators such as potassium persulfate and ammonium persulfate; peroxide-based polymerization initiators such as benzoyl peroxide, hydrogen peroxide, t-butyl hydroperoxide, di-t-butyl peroxide, t-butyl peroxybenzoate, dicumyl peroxide, 1,1-bis(t-butylperoxy)-3,3,5-trimethylcyclohexane, 1,1-bis(t-butylperoxy)cyclododecane, 3,3,5-trimethylcyclohexanoyl peroxide, and t-butyl peroxypivalate; and redox-based polymerization initiators composed of persulfates and sodium bisulfite. These polymerization initiators may be used alone or in combination. UV irradiation or radiation exposure may also be used. The polymerization initiator is preferably used in an amount of 0.005 to 1 part by weight per 100 parts by weight of the acrylic monomer. By using the polymerization initiator in this range, an acrylic polymer with excellent adhesive properties can be formed.

(electrolyte)
The electrolyte is not particularly limited as long as it can impart electro-release properties to the electro-release pressure-sensitive adhesive, but an electrolytic solution containing the electrolyte preferably has an ionic conductivity of 10 ⁻⁷ S/cm or more, more preferably 10 ⁻⁶ S/cm or more. Examples of the electrolyte include quaternary ammonium salts and alkali metal salts. The ionic conductivity can be measured, for example, by the AC impedance method. The ionic conductivity can be measured, for example, by the AC impedance method as follows.

At room temperature, a sample (electrolyte, etc.) is placed on a stainless steel plate using a bipolar cell, and another stainless steel plate is placed on top of the sample, sandwiching it between the plates. A spacer is used to control the shape of the sample into a disk of a fixed area and thickness, yielding a measurement sample. A voltage is applied to the sample, and the frequency that defines the amplitude is varied. The Cole-Cole plot obtained is then curve-fitted using an equivalent circuit to determine the bulk resistance (Ω). The ionic conductivity δ of the sample can be calculated by substituting the sample area A, sample thickness L, and bulk resistance Rb into the following equation:

δ＝L/(Rb×A)
[δ: ionic conductivity, Rb: bulk resistivity, L: sample thickness (cm), A: sample area (cm ² )]

Examples of quaternary ammonium salts include (R) ₄ NX (formula (1): in formula (1), R may be the same or different and is an alkyl group having 1 to 4 carbon atoms, and X is a halogen, ClO ₄ , BF ₄ , or PF ₆ ), [(R) ₄ N] ₂ SO ₄ (formula (2): in formula (2), R may be the same or different and is an alkyl group having 1 to 4 carbon atoms), etc.

When X in formula (1) is a halogen, examples of the quaternary ammonium salt include ammonium bromides or ammonium chlorides such as tetrabutyl, tetrapropyl, tetraethyl, tetramethyl, triethylbutyl, triethylpropyl, and triethylmethyl.
When X in formula (1) is BF ₄ , examples of the quaternary ammonium salt include ammonium tetrafluoroborates such as tetrabutyl, tetrapropyl, tetraethyl, tetramethyl, triethylbutyl, triethylpropyl, and triethylmethyl.
When X is _PF6 in formula (1), examples of the quaternary ammonium salt include ammonium hexafluorophosphates such as tetrabutyl, tetrapropyl, tetraethyl, tetramethyl, triethylbutyl, triethylpropyl, and triethylmethyl.
When X in formula (1) is ClO ₄ , examples of the quaternary ammonium salt include ammonium perchlorates such as tetrabutyl, tetrapropyl, tetraethyl, tetramethyl, triethylbutyl, triethylpropyl, and triethylmethyl.

When Y is SO ₄ in formula (2), examples of the quaternary ammonium salt include ammonium sulfates such as tetrabutyl, tetrapropyl, tetraethyl, tetramethyl, triethylbutyl, triethylpropyl, and triethylmethyl.

The above-mentioned quaternary ammonium salts may be used alone or in combination with two or more. They may also be used in combination with the alkali metal salts described below.

Examples of alkali metal salts include _α2SO4 , _αBF4 , _αPF6 , _αClO4 , _αAsF6 , _αCF3SO3 , _αN ( _SO2CF3 ) _{2, αN(SO2C2F5)2 , αC} ( _SO2CF3 ) ₃ , βSO4, β _{( PF6} ) ₂ , β( _ClO4 ) ₂ , β( _AsF6 ) ₂ , β( _{CF3SO3 ) 2} , β[N( _{SO2CF3 )2]2 , β [} N( _SO2C2F5 ) ₂ ] ₂ , β _[ C _{( SO2CF3} ) ₃ ] _{2 , etc.} (In each compound, α represents _an alkali metal and _β represents _an alkaline earth metal).

(ionic liquid)
Ionic liquids are a combination of cations and anions that are liquid at room temperature and are also called room-temperature molten salts. Ionic liquids have properties such as non-flammability, non-volatility, and chemical stability. When a voltage is applied to an ionic liquid, anions migrate to the positive electrode side and cations migrate to the negative electrode side. It is believed that the migration of anions and cations to the vicinity of the electrode or the occurrence of an oxidation-reduction reaction of the anions or cations at the interface between the electrode and the electro-releasable pressure-sensitive adhesive layer weakens the adhesive strength of the electro-releasable pressure-sensitive adhesive layer, resulting in improved releasability.

The ionic conductivity of the ionic liquid is not particularly limited, but is preferably 10 ^-7 S/cm or more, more preferably 10 ^-6 S/cm or more, more preferably 10 ^-4 S/cm or more, and even more preferably 10 ^-3 S/cm or more. Examples of ionic liquids include combinations of cyclic cations and anions represented by the following formula (3):

[wherein R ¹ is a divalent hydrocarbon group having 2 to 8 carbon atoms which may contain a heteroatom and which forms a ring together with N ⁺ in the formula; R ² and R ³ are the same or different and are a hydrogen atom or an alkyl group having 1 to 6 carbon atoms (however, when the nitrogen atom forms a double bond with the adjacent carbon atom, R ³ does not exist);
X ^- is an anion selected from Cl ^- , Br ^- , I ^- , AlCl ₄ ^- , Al ₂ Cl ₇ ^- , NO ₃ ^- , BF ₄ ^- , PF ₆ ^- , ClO ₄ ^- , CH ₃ COO ^- , CF ₃ COO ^- , CF ₃ SO ₃ ^- , (CF ₃ SO ₂ ) ₂ N ^- , (FSO ₂ ) ₂ N ^- , (CF ₃ SO ₂ ) ₃ C ^- , AsF ₆ ^- , SbF ₆ ^- , NbF ₆ ^- , F(HF) _n - , B(C ₆ H ₅ ) ₄ ^- , C ₄ F ₉ SO ₃ ^- , CF ₃ (CF ₂ ) ₃ SO ₃ ^- , (CF ₃ CF ₂ SO ₂ ) ₂ N ^- and CF ₃ CF ₂ COO ^- ]

In the above formula, the ring formed by ^R1 and N ⁺ includes rings in which at least one carbon atom constituting a hydrocarbon ring, such as saturated alicyclic hydrocarbons such as cyclopropane, cyclobutane, cyclopentane, cyclohexane, cycloheptane, and cyclooctane, and unsaturated cyclic hydrocarbons such as cyclopropene, cyclobutene, cyclopentene, cyclohexene, cycloheptene, cyclooctene, cyclopentadiene, and benzene, is replaced with a nitrogen atom. Examples of heteroatoms include N, O, S, and P, with N being preferred.

Examples of alkyl groups having 1 to 6 carbon atoms include methyl, ethyl, propyl, butyl, pentyl, and hexyl groups. Alkyl groups having 3 to 8 carbon atoms include structural isomers.

Another example of an ionic liquid is a combination of a cation and an anion represented by the following formula (4) or (5):

[wherein Y is N or P, R ⁴ to R ⁷ are the same or different and are a hydrogen atom (provided that all of R ⁴ to R ⁷ are not hydrogen atoms) or a linear, branched or cyclic alkyl group having from 1 to 20 carbon atoms, which may have a substituent (provided that when a nitrogen atom forms a double bond with an adjacent carbon atom, R ⁷ does not exist), and the substituent is selected from the group consisting of a halogen atom, a hydroxy group, a nitro group and a cyano group;
X ^- is an anion selected from Cl ^- , Br ^- , I ^- , AlCl ₄ ^- , Al ₂ Cl ₇ ^- , NO ₃ ^- , BF ₄ - , PF ₆ ^- , ClO ₄ ^- , CH ₃ COO ^- , CF ₃ COO ^- , CF ₃ SO ₃ ^- , (CF ₃ SO ₂ ) ₂ N ^- , (FSO ₂ ) ₂ N ^- , (CF ₃ SO ₂ ) ₃ C ^- , AsF ₆ ^- , SbF ₆ ^- , NbF ₆ ^- , F(HF) _n - , B(C ₆ H ₅ ) ₄ ^- , C ₄ F ₉ SO ₃ ^- , CF ₃ (CF ₂ ) ₃ SO ₃ ^- , (CF ₃ CF ₂ SO ₂ ) ₂ N ^- and CF ₃ CF ₂ COO ^- ]

[wherein R ⁸ to R ¹⁰ are the same or different and each represents a hydrogen atom (provided that all of R ⁸ to R ¹⁰ are not hydrogen atoms) or a linear, branched or cyclic alkyl group having from 1 to 20 carbon atoms which may have a substituent, and the substituent is selected from the group consisting of a halogen atom, a hydroxy group, a nitro group and a cyano group;
X ^- is an anion selected from Cl ^- , Br ^- , I ^- , AlCl ₄ ^- , Al ₂ Cl ₇ ^- , NO ₃ ^- , BF ₄ - , PF ₆ ^- , ClO ₄ ^- , CH ₃ COO ^- , CF ₃ COO ^- , CF ₃ SO ₃ ^- , (CF ₃ SO ₂ ) ₂ N ^- , (FSO ₂ ) ₂ N ^- , (CF ₃ SO ₂ ) ₃ C ^- , AsF ₆ ^- , SbF ₆ ^- , NbF ₆ ^- , F(HF) _n - , B(C ₆ H ₅ ) ₄ ^- , C ₄ F ₉ SO ₃ ^- , CF ₃ (CF ₂ ) ₃ SO ₃ ^- , (CF ₃ CF ₂ SO ₂ ) ₂ N ^- and CF ₃ CF ₂ COO ^- ]

The cation in the ionic liquid preferably has a weight-average molecular weight of 700 or less, more preferably a weight-average molecular weight of 50 to 600, even more preferably a weight-average molecular weight of 50 to 500, and even more preferably a weight-average molecular weight of 50 to 400. The upper limit of the weight-average molecular weight of the cation in the ionic liquid is, for example, 700, 650, 600, 550, 500, 450, 400, 350, 300, 250, 200, or 150. The lower limit of the weight-average molecular weight of the cation in the ionic liquid is, for example, 30, 40, 50, 60, 70, 80, 90, 99, or 100. The weight-average molecular weight here refers to the weight-average molecular weight in terms of polystyrene.

The ionic liquid is preferably a combination of a cyclic cation represented by formula (3) and an anion, ^more preferably a combination of a cation selected from pyridinium-based cations, cyclic aliphatic ammonium cations, and imidazolium-based cations with an anion selected from ( _FSO2 ) _2N- ^, ( _CF3SO2 ) _2N- ^, and _{BF4- ,} and more preferably a combination of a cation selected from imidazolium-based cations with an anion selected from ( _FSO2 ) _2N- , ( _CF3SO2 ) _2N- , and _BF4- from the viewpoint _of improving peelability after application of voltage.

Ionic liquids are available from Dai-ichi Kogyo Seiyaku Co., Ltd., Kanto Chemical Co., Ltd., Koei Chemical Industry Co., Ltd., and others. For example, 1-ethyl-3-methylimidazolium bis(fluorosulfonyl)imide (EMI-FSI) and 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide (EMI-TFSI) are available from Dai-ichi Kogyo Seiyaku Co., Ltd.; 1-hexylpyridinium bis(trifluoromethanesulfonyl)imide, N-butyl-N-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide, and 1-ethyl-3-methylimidazolium tetrafluoroborate are available from Kanto Chemical; and 1-ethyl-3-methylimidazolium hexafluorophosphate, 1-butylpyridinium tetrafluoroborate, and 1-hexylpyridinium bis(trifluoromethanesulfonyl)imide are available from Koei Chemical Industry Co., Ltd. The cation and anion combinations contained in EMI-FSI and EMI-TFSI are as follows:

The amount of ionic liquid contained in the electro-releasable adhesive is not particularly limited, but is preferably 1 to 90 parts by weight, more preferably 5 to 80 parts by weight, more preferably 5 to 60 parts by weight, and even more preferably 10 to 50 parts by weight, per 100 parts by weight of acrylic polymer. The upper limit of the amount of ionic liquid contained in the electro-releasable adhesive is, for example, 90 parts by weight, 80 parts by weight, 70 parts by weight, 60 parts by weight, or 50 parts by weight per 100 parts by weight of acrylic polymer. The lower limit of the amount of ionic liquid contained in the electro-releasable adhesive is, for example, 1 part by weight, 5 parts by weight, 10 parts by weight, 12 parts by weight, or 15 parts by weight per 100 parts by weight of acrylic polymer. The ionic liquid may be a combination of one cation and one anion, or a combination of multiple types of cations and anions.

(Transportation promoter)
In this embodiment, the electrically releasable adhesive may contain a migration promoter that promotes ion migration when a voltage is applied. Examples of the migration promoter include polyethylene glycol and alkyl ethers of polyethylene glycol, and alkyl ethers of polyethylene glycol are preferred.

The molecular weight of the migration promoter is not particularly limited, but preferably has a weight-average molecular weight of 120 to 600, more preferably 120 to 550, even more preferably 120 to 500, and even more preferably 120 to 360. The upper limit of the weight-average molecular weight of the migration promoter is, for example, 600, 590, 580, 570, 560, 550, 540, 530, 520, 510, 500, 490, 480, 470, 460, 450, 440, 430, 420, 410, 400, 390, 380, 370, 360, 355, 350, or 340. The lower limit of the weight average molecular weight of the migration promoter is, for example, 120, 125, 130, 135, 140, 145, 150, 155, 160, or 170. The weight average molecular weight here refers to the weight average molecular weight in terms of polystyrene.

Examples of polyethylene glycol alkyl ethers include polyethylene glycol mono(di)methyl ether, polyethylene glycol mono(di)ethyl ether, polyethylene glycol mono(di)propyl ether, polyethylene glycol mono(di)isopropyl ether, polyethylene glycol mono(di)butyl ether, polyethylene glycol mono(di)isobutyl ether, polyethylene glycol mono(di)methyl ether, and polyethylene glycol mono(di)pentyl ether. Among these, polyethylene glycol alkyl ethers having a weight-average molecular weight of 120 to 360 are preferred, with polyethylene glycol mono(di)methyl ether having a weight-average molecular weight of 120 to 360 being more preferred. Among these, tetraethylene glycol dimethyl ether (dimethyltetraglycol), diethylene glycol dibutyl ether, triethylene glycol butylmethyl ether, dimethyltriglycol, and triethylene glycol monomethyl ether are more preferred, with tetraethylene glycol dimethyl ether being even more preferred. Polyethylene glycol alkyl ethers are available from Nippon Nyukazai Co., Ltd., Toho Chemical Industry Co., Ltd., and other companies. The polyethylene glycol alkyl ethers used may be used alone or in combination of two or more.

The amount of migration promoter contained in the electroreleasable adhesive is not particularly limited, but may be, for example, 1 to 90 parts by weight, 5 to 80 parts by weight, 5 to 50 parts by weight, 5 to 40 parts by weight, or 5 to 30 parts by weight, per 100 parts by weight of acrylic polymer. The upper limits of the migration promoter contained in the electroreleasable adhesive are, for example, 90 parts by weight, 80 parts by weight, 70 parts by weight, 60 parts by weight, 50 parts by weight, 40 parts by weight, and 30 parts by weight, per 100 parts by weight of acrylic polymer. The lower limits of the migration promoter contained in the electroreleasable adhesive are, for example, 1 part by weight, 5 parts by weight, 7 parts by weight, 10 parts by weight, 13 parts by weight, and 15 parts by weight, per 100 parts by weight of acrylic polymer.

(organic solvent)
The electrically releasable adhesive may contain an organic solvent. The organic solvent is not particularly limited, and examples include known organic solvents that can be used in adhesives. The organic solvent may be either a hydrophilic or hydrophobic organic solvent. Examples of hydrophilic organic solvents include methanol, ethanol, 1-propanol, 2-propanol, n-butyl alcohol, sec-butyl alcohol, isobutanol, tert-butyl alcohol, acetonitrile, acetone, and dimethylformamide. Examples of hydrophobic organic solvents include aliphatic hydrocarbons such as hexane, heptane, and isooctane; esters such as methyl acetate, ethyl acetate, and propyl acetate; aromatic hydrocarbons such as benzene, toluene, xylene, and ethylbenzene; halogenated hydrocarbons such as dichloromethane, 1,2-dichloroethane, chloroform, 1-chlorobutane, and chlorobenzene; ethers such as diethyl ether and t-butyl methyl ether; and ketones such as methyl ethyl ketone and methyl isobutyl ketone. These organic solvents may be used alone or in combination. When an organic solvent is used, the proportion of the organic solvent used is preferably adjusted so that the solid content of the acrylic polymer is 10% by weight or more, and more preferably adjusted so that the solid content is 20% by weight or more and 70% by weight or less.

(additives)
In addition to the above components, the electrically peelable pressure-sensitive adhesive of the present embodiment may contain additives such as conductive materials, fillers, plasticizers, antioxidants, flame retardants, colorants, surfactants, and highly water-absorbent polymers.

Conductive materials are mainly classified into carbon-based conductive materials and metal-based conductive materials. Carbon-based conductive materials include, for example, nanocarbon or carbon fiber (e.g., vapor-grown carbon fiber (VGCF) or carbon nanofiber), and more specifically, natural graphite, artificial graphite, acetylene black, ketjen black, furnace black, etc. Metal-based conductive materials include, for example, metals such as Cu, Ni, Al, Ag, Au, Pt, Zn, or Mn, or alloys of these. Conductive materials may be used alone or in combination.

Examples of fillers include silica, diatomaceous earth, alumina, zinc oxide, magnesium oxide, calcium carbonate, magnesium carbonate, calcium sulfate, barium sulfate, calcium silicate, talc, mica, bentonite, activated clay, glass fiber, aluminum nitride, etc. Fillers may be used alone or in combination.

Examples of plasticizers include polyols such as glycerin, diglycerin, triglycerin, ethylene glycol, propylene glycol, and polyethylene glycol; aliphatic polycarboxylic acid esters such as adipate esters, citrate esters, sebacate esters, azelaate esters, and maleate esters; aromatic polycarboxylic acid esters such as terephthalate esters, isophthalate esters, phthalate esters, trimellitate esters, and benzoate esters; and polyesters. Plasticizers may be used alone or in combination.

Examples of antioxidants include phenol-based antioxidants, amine-based antioxidants, lactone-based antioxidants, phosphorus-based antioxidants, and sulfur-based antioxidants. Antioxidants may be used alone or in combination.

Examples of flame retardants include phosphorus- and halogen-containing organic compounds, bromine- or chlorine-containing organic compounds, additives such as ammonium polyphosphate, aluminum hydroxide, and antimony oxide, as well as reactive flame retardants. Flame retardants may be used alone or in combination.

Examples of colorants include inorganic pigments such as carbon black, titanium oxide, zinc oxide, iron oxide, and mica, and organic pigments such as coupling azo pigments, condensed azo pigments, anthraquinone pigments, thioindigo pigments, dioxazone pigments, and phthalocyanine pigments. Colorants may be used alone or in combination.

Examples of surfactants include anionic surfactants such as pyridinium salts, benzethonium chloride, alkylbenzenesulfonates, α-olefinsulfonates, and phosphate esters; and nonionic surfactants such as amine salts (alkylamine salts, imidazolines, etc.), sorbitan tristearate, sorbitan monopalmitate, sorbitan trioleate, stearic acid monoglyceride, polyoxyethylene nonylphenyl ether, and polyoxyethylene dodecyl ether. Surfactants may be used alone or in combination.

Examples of superabsorbent polymers include sodium poly(meth)acrylate, potassium poly(meth)acrylate, ammonium poly(meth)acrylate, calcium poly(meth)acrylate, magnesium poly(meth)acrylate, hydroxyethyl cellulose, hydroxypropyl cellulose, poly(meth)acrylamide, poly-N-isopropylamide, polyvinylpyrrolidone, polyvinyl acetate, polyvinyl alcohol, polyvinyl butyral, polyethylene glycol, or derivatives or crosslinked products thereof. Superabsorbent polymers may be used alone or in combination.

The amount of these additives (excluding adhesives other than the above-mentioned acrylic polymers) contained in the electrically releasable adhesive is not particularly limited, but can be, for example, 0.1 to 200 parts by weight, or 1 to 100 parts by weight, per 100 parts by weight of acrylic polymer.

The method for forming the first and second electrically releasing adhesive layers is not particularly limited. For example, they can be formed by applying an electrically releasing adhesive to a release-treated polyethylene terephthalate film (release film) or the like, and then laminating the substrate thereto. After applying the electrically releasing adhesive to the release film, the electrically releasing adhesive may be heated to dry it. Another example of formation is by applying the electrically releasing adhesive to a substrate. The method for applying these electrically releasing adhesives is not particularly limited. Examples include direct application with a brush or the use of an application device used in the manufacture of adhesive tapes. Examples of application devices that can be used include a spin coater, gravure coater, applicator, multi-coater, die coater, bar coater, roll coater, blade coater, or knife coater. The thickness of the first and second electrically releasing adhesive layers is not particularly limited, but is preferably 1 μm or more and 100 μm or less, more preferably 1 μm or more and 50 μm or less, and even more preferably 5 μm or more and 30 μm or less. When electrically releasing adhesive layers are formed on both sides of the adhesive layer, the two electrically releasing adhesive layers may have the same thickness or different thicknesses. Furthermore, the two electrically releasing adhesive layers may have the same composition or different compositions. The surface of the adhesive body to be used may be protected by a release film, release paper, or the like until use.

The complex may contain multiple adhesive bodies. The number of adhesive bodies may be, for example, 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10.

This embodiment also provides a composite comprising an electrically releasing adhesive layer, a first conductor adhered to a first adhesive surface of the electrically releasing adhesive layer, a second conductor adhered to a second adhesive surface of the electrically releasing adhesive layer, and a third conductor adhered to the second adhesive surface and insulated from the second conductor. In this composite, the electrically releasing adhesive layer is molded into a planar shape and has two surfaces. These two surfaces are referred to as the first adhesive surface and the second adhesive surface, respectively. Figure 10A shows an example of an electrically releasing adhesive layer. The composition of this electrically releasing adhesive layer is as described above.

Figure 10B shows an example of a composite (composite 9) of an electro-releasable adhesive layer and first to third conductors. In composite 9, the first conductor is attached to the first adhesive surface, and the second and third conductors are attached to the second adhesive surface. In this composite, the second and third conductors are insulated by air. Figure 10C shows electrode terminals connected to the second and third conductors. By forming a circuit as shown in Figure 10C and applying a voltage, electro-peeling occurs at the contact surface between the adhesive and the third conductor, thereby separating the third conductor from composite 9 (see Figure 10D). Thus, similar to the electro-releasable adhesive described above, even when a composite is formed using an electro-releasable adhesive layer, electro-peeling can be achieved without connecting an electrode to the first conductor. The attached conductors can then be separated by electro-peeling. The conductors used, the power source, the applied voltage, and other details are as described above. While the above example was performed using a configuration similar to composite 1, configurations similar to composites 2 to 8 may also be used.

(Separation method)
This embodiment also provides a method for separating the conductors from the electro-releasable adhesive layers in a composite comprising an electro-releasable adhesive, a first conductor adhered to the first electro-releasable adhesive layer of the electro-releasable adhesive, a second conductor adhered to the second electro-releasable adhesive layer of the electro-releasable adhesive, and a third conductor adhered to the second electro-releasable adhesive layer and insulated from the second conductor, the method comprising the step of applying a voltage between the second conductor and the third conductor (hereinafter also referred to simply as the separation method). The electro-releasable adhesive, the first conductor, the second conductor, the third conductor, and the application of the voltage are as described above.

The separation method of this embodiment may include a step of attaching electrode terminals to the composite. The electrodes are connected to at least two of the conductors attached to the second electrically releasable adhesive layer of the composite. In this case, if the conductors are insulators to which the above-mentioned conductive auxiliary material is attached, the electrodes are connected to the conductive auxiliary material.

The separation method of the present invention may further include a step of forming a composite. The composite may be formed, for example, by adhering a first conductor to the first electrically releasing adhesive layer of the adhesive body, and adhering a second conductor and a third conductor to the second electrically releasing adhesive layer so that the second conductor and the third conductor are insulated from each other. An insulator may be adhered to the first electrically releasing adhesive layer or the second electrically releasing adhesive layer. When it is desired to use an insulator as the first conductor, the second conductor, and the third conductor, a conductive auxiliary material is adhered to the insulator, and the surface to which the conductive auxiliary material is adhered is adhered so that it contacts the adhesive body.

This embodiment also provides a method for separating a conductor from an electroreleasable adhesive layer in a composite comprising an electroreleasable adhesive layer, a first conductor adhered to a first adhesive surface of the electroreleasable adhesive layer, a second conductor adhered to a second adhesive surface of the electroreleasable adhesive layer, and a third conductor adhered to the second adhesive surface and insulated from the second conductor, the method comprising applying a voltage between the second conductor and the third conductor. The electroreleasable adhesive layer, first adhesive surface, second adhesive surface, first conductor, second conductor, third conductor, and voltage application are as described above.

The present invention will be explained in more detail below using examples and comparative examples, but the present invention is not limited by these in any way.

[Electrical peeling test using electrically peelable adhesive]
Two types of electro-releasable adhesives were prepared, and composites were formed by combining them with the first, second, and third conductors, and an electro-releasable test was performed. The electro-releasable adhesive used in the composites was prepared as follows.

(Electrically releasable adhesive A)
1. Preparation of acrylic polymer
A monomer mixture consisting of 91 parts by weight of n-butyl acrylate (Mitsubishi Chemical Corporation), 8 parts by weight of acrylic acid (Mitsubishi Chemical Corporation), and 1 part by weight of 2-hydroxyethyl methacrylate (Nippon Shokubai Co., Ltd.) and 186 parts by weight of polymerization solvent (ethyl acetate:toluene (weight ratio) = 9:1)) was placed in a glass flask and purged with nitrogen gas. After that, 0.2 parts by weight of azobisisobutyronitrile (AIBN, Junsei Chemical Co., Ltd.) was added as a polymerization initiator, and the temperature was raised to 85°C and polymerization reaction was carried out for 5 hours to obtain an acrylic adhesive. The resulting acrylic adhesive contained 35% by weight of an acrylic polymer (weight average molecular weight approximately 800,000, Tg -46°C) and had a viscosity of 7,000 mPa s.

2. Preparation of Electrically Peelable Pressure Sensitive Adhesive To 100 parts by weight of the above acrylic pressure sensitive adhesive (including 35 parts by weight of acrylic polymer), 2 parts by weight of Takenate (registered trademark) D-101E (Mitsui Chemicals, Inc.) as an isocyanate crosslinking agent, 7 parts by weight of Elexcel (registered trademark) AS-110 (EMI-FSI: Dai-ichi Kogyo Seiyaku Co., Ltd.) as an ionic liquid, and 7 parts by weight of dimethyl tetraglycol (Nippon Nyukazai Co., Ltd.: molecular weight approximately 220) as a migration promoter were added, and the mixture was stirred with a dissolver at room temperature for 10 minutes and allowed to stand to degas, to obtain Electrically Peelable Pressure Sensitive Adhesive A (Adhesive A).

(Electro-releasable adhesive A)
Pressure-sensitive adhesive A was applied to a silicone-treated polyethylene terephthalate film (hereinafter also referred to as a release film) to a dry thickness of 35 μm, and dried at 100°C for 5 minutes. A polyester nonwoven fabric [Milife (registered trademark) TY0503FE (ENEOS Techno Materials Corporation): basis weight 8.0 g/m ² , thickness 40 μm] was attached to the adhesive-coated surface of the dried film. Similarly, Pressure-sensitive Adhesive A was applied to a release film to a dry thickness of 35 μm, a dried film was produced, and this was attached to the side of the nonwoven fabric where the film was not attached. This was then left to stand at 40°C for 3 days to produce an electrically peeling pressure-sensitive adhesive body A (adhesive body A). The film thickness of pressure-sensitive adhesive body A excluding the film was 80 μm.

(Electrically peelable adhesive B)
1. Preparation of Acrylic Polymer The acrylic polymer prepared in the above-mentioned preparation of acrylic polymer was used.

2. Preparation of Electrically Peelable Pressure Sensitive Adhesive To 100 parts by weight of the above acrylic pressure sensitive adhesive (including 35 parts by weight of acrylic polymer), 2 parts by weight of Takenate (registered trademark) D-101E as an isocyanate crosslinking agent and 14 parts by weight of Elexcel (registered trademark) AS-110 (EMI-FSI: Dai-ichi Kogyo Seiyaku Co., Ltd.) as an ionic liquid were added, and the mixture was stirred with a dissolver at room temperature for 10 minutes and allowed to stand to degas, thereby obtaining electrically peelable pressure sensitive adhesive B (pressure sensitive adhesive B).

(Electro-releasable adhesive B)
An electrically peelable adhesive body B (adhesive body B) was produced in the same manner as the electrically peelable adhesive body A, except that adhesive B was used instead of adhesive A. The thickness of adhesive body B excluding the film was 80 μm.

Example 1: Formation of Complex 1
The above-mentioned adhesive body A or B was cut into a size of 100 mm x 100 mm. The polyethylene terephthalate film attached to the cut-out adhesive body A or B was peeled off, and the exposed adhesive surface (first electrically releasable adhesive layer) was attached to a stainless steel plate (first conductor). The remaining polyethylene terephthalate film of adhesive body A or B attached to the stainless steel plate was peeled off, and two pieces of aluminum foil (second and third conductors) measuring 30 mm x 30 mm were attached to the exposed adhesive surface (second electrically releasable adhesive layer) so that they did not directly touch each other, thereby forming composite 1. A cross-sectional view of composite 1 is shown in Figure 2A.

(Voltage application)
Electrodes and a DC power supply were attached to each of the two aluminum foils of composite 1 (Figure 2B). A transformer was used to adjust the voltage, and a voltage of 20 V was applied for 30 seconds (Figure 2C). As a result, one of the aluminum foils could be easily peeled off from the composite (Figure 2D). This result was obtained whether adhesive A or B was used in the composite. This demonstrates that in a composite such as composite 1, which combines a first conductor adhered to the first electroreleasable adhesive layer of an electroreleasable adhesive and second and third conductors adhered to the second electroreleasable adhesive layer, electrical peeling can be induced by connecting electrodes to the two conductors and applying a voltage, and the third conductor can be easily peeled off from the composite.

Example 2: Complex formation 2
Composite 2 was formed in the same manner as in Example 1, except that a 30 mm × 30 mm polyethylene terephthalate film (insulator) was attached between the second conductor and the third conductor so as to be in contact with both of the two aluminum foils. As with composite 1, two types of composite 2 were produced using the above-mentioned adhesive bodies A and B, respectively. A cross-sectional view of composite 2 is shown in Figure 3A.

For composite 2, as with composite 1, electrodes and a DC power supply were attached to each of the two aluminum foils (Figure 3B), and a voltage was applied in the same way as in Example 1. As a result, one of the aluminum foils (the third conductor) could be easily peeled off from the composite (Figure 3C).

Example 3: Complex formation 3
The polyethylene terephthalate film attached to the adhesive body A or B cut out in the same manner as in Example 1 was peeled off. The exposed adhesive surface (first electrically releasable adhesive layer) was attached to a stainless steel plate (first conductor). The remaining polyethylene terephthalate film from the adhesive sheet A or B attached to the stainless steel plate was peeled off, and three 20 mm x 20 mm pieces of aluminum foil were attached to the exposed adhesive surface (second electrically releasable adhesive layer). A 20 mm x 20 mm polyethylene terephthalate film (insulator) was attached between each of the three conductors (second, third, and fourth conductors, respectively) so that it was in contact with both aluminum foils between the two aluminum foils, forming a composite 3. A schematic diagram of composite 3 is shown in Figure 4A.

Electrodes and a DC power supply were connected to each of the three aluminum foils in composite 3 (Figure 4B). A voltage of 20 V was applied for 30 seconds. As a result, two of the three aluminum foils (the third and fourth conductors) were easily peeled off from the composite (Figure 4C). This result was achieved whether adhesive A or B was used in the composite. This demonstrates that by attaching electrodes to three or more conductors, as in composite 3, electro-peeling can be achieved in multiple parts of the electro-peeling adhesive, making it possible to peel off multiple conductors with a single current.

Example 4: Complex formation 4
Two adhesive bodies, A and B, were prepared. The polyethylene terephthalate films attached to these adhesive bodies were peeled off. The exposed adhesive surfaces (first electroreleasable adhesive layer) were each attached to a stainless steel plate (first conductor). At this point, two adhesive bodies were adhered to the stainless steel plate. The polyethylene terephthalate film on the side of adhesive body A or B that had not yet been peeled off was peeled off, and two 30 mm x 30 mm pieces of aluminum foil (second conductor and third conductor) were attached to the exposed adhesive surface (second electroreleasable adhesive layer), each attached to a separate adhesive sheet, to form composite 4. A schematic diagram of composite 4 is shown in Figure 5A.

For composite 4, as with composite 1, electrodes and a DC power supply were connected to each of the two aluminum foils (Figure 5B). A voltage was applied to this as in Example 1. As a result, one of the aluminum foils could be easily peeled off from the composite (Figure 5C). This demonstrates that even if the two conductors are not connected via an adhesive, electricity can be passed between them by applying a voltage via the first conductor, and that the conductors can be peeled off by causing electrical peeling.

1 First conductor 2 Second conductor 3 Third conductor 4 Fourth conductor 10 Electrically releasable adhesive body 11 First electrically releasable adhesive layer 12 Second electrically releasable adhesive layer 13 Base 20 Insulator 30 Conductive auxiliary material 40 Electrically releasable adhesive layer 100 DC power supply

Claims (23)

an electrically releasable adhesive body comprising a substrate, a first electrically releasable adhesive layer on a first surface of the substrate, and a second electrically releasable adhesive layer on a second surface of the substrate;
a first conductor attached to the first electrically releasable adhesive layer;
a second conductor attached to the second electrically releasing adhesive layer;
a third conductor attached to the second electrically releasing adhesive layer and insulated from the second conductor;
A composite in which the second conductor and the third conductor are insulated by an insulator applied to the second electrically releasable adhesive layer. Further comprising a power source;
a positive electrode of the power source is connected to the second conductor;
10. The composite of claim 1, wherein the negative electrode of the power source is connected to the third conductor. The composite of claim 2, wherein no electrode is connected to the first conductor. further comprising a fourth conductor attached to the second electrically releasing adhesive layer,
the fourth conductor is insulated from the second conductor and the third conductor;
3. The composite of claim 2, wherein the negative electrode of the power source is connected to the fourth conductor. The composite of claim 1, wherein the composite has two or more electroreleasable adhesive bodies, and the second conductor and the third conductor are attached to different electroreleasable adhesive bodies. The composite described in claim 2, wherein the voltage of the power supply is 1 V or more and 100 V or less. The composite described in any one of claims 1 to 6, wherein at least one of the first electrically peelable adhesive layer and the second electrically peelable adhesive layer contains an acrylic polymer and an ionic liquid. The composite described in claim 7, wherein the content of the ionic liquid is 10 parts by weight or more and 90 parts by weight or less per 100 parts by weight of the acrylic polymer. The ionic liquid is represented by the following formula (1):

(In the formula, R ¹ is a divalent hydrocarbon group having 2 to 8 carbon atoms which may contain a heteroatom, and forms a ring together with N ⁺ in the formula,
^R2 and ^R3 are the same or different and each represent a hydrogen atom or an alkyl group having 1 to 6 carbon atoms (however, when a nitrogen atom forms a double bond with an adjacent carbon atom, ^R3 does not exist),
X ^- is _an anion selected from Cl ^- , Br ^- , I ^- , _AlCl4 ^- , _Al2Cl7 -, _NO3 ^- , _BF4 ^- , _PF6 ^{- ,} _ClO4 ^- , _{CH3COO- , CF3COO-} , _CF3SO3 ^- , ( _CF3SO2 ) _{2N- ,} ( _FSO2 ⁾ _2N- ^, ( _CF3SO2 ) _3C- ^, _AsF6- ^{, SbF6-} _{, NbF6-} ^, _F ⁽ _HF ⁾ _n- ^, B _{( C6H5} ) _{4- , C4F9SO3-} , _{CF3 ( CF2 ) 3SO3-} ^{, (} _{CF3CF2SO2 ) 2N- and} ^CF3CF2COO- _.
The complex according to claim 7, represented by: The composite according to claim 7, wherein the acrylic polymer comprises a copolymer of an alkyl (meth)acrylate having an alkyl group having 1 to 8 carbon atoms, a carboxyl group-containing acrylic monomer, and/or a hydroxyl group-containing acrylic monomer. 8. The composite according to claim 7, wherein the substrate has a basis weight of 10.0 g/ ^m2 or less and a thickness of 10 μm or more and 50 μm or less. The composite of claim 7, wherein at least one of the first and second electroreleasable adhesive layers further comprises a migration promoter. The complex of claim 12, wherein the migration promoter is an alkyl ether of polyethylene glycol. an electrically releasable adhesive body comprising a substrate, a first electrically releasable adhesive layer on a first surface of the substrate, and a second electrically releasable adhesive layer on a second surface of the substrate;
a first conductor attached to the first electrically releasable adhesive layer;
a second conductor attached to the second electrically releasing adhesive layer;
a composite comprising a third conductor adhered to the second electrically releasing pressure sensitive adhesive layer and insulated from the second conductor,
A method for peeling a conductor from an electrically releasable pressure-sensitive adhesive layer, comprising the step of applying a voltage between the second conductor and the third conductor. The method of claim 14 , further comprising forming the complex. The method of claim 14 , wherein no voltage is applied directly to the first conductor. further comprising a fourth conductor attached to the second electrically releasing adhesive layer,
the fourth conductor is insulated from the second conductor and the third conductor;
The method of claim 14 , wherein a voltage is also applied to the fourth conductor when the voltage is applied. The method of claim 14 , wherein the composite has two or more electroreleasable adhesives, and the second conductor and the third conductor are attached to different electroreleasable adhesives. The method of claim 14 , wherein the applied voltage is between 1 V and 100 V. The separation method according to claim 14 , wherein the voltage application time is from 1 second to 600 seconds. The method according to any one of claims 14 to 20 , wherein at least one of the first electrically peelable adhesive layer and the second electrically peelable adhesive layer comprises an acrylic polymer and an ionic liquid. The method of claim 21 , wherein at least one of the first and second electrically releasable adhesive layers further comprises a migration promoter. The method of claim 22 , wherein the migration promoter is an alkyl ether of polyethylene glycol.