WO2022210055A1 - Feuille adhésive, corps lié et procédé de séparation de corps lié - Google Patents

Feuille adhésive, corps lié et procédé de séparation de corps lié Download PDF

Info

Publication number
WO2022210055A1
WO2022210055A1 PCT/JP2022/012878 JP2022012878W WO2022210055A1 WO 2022210055 A1 WO2022210055 A1 WO 2022210055A1 JP 2022012878 W JP2022012878 W JP 2022012878W WO 2022210055 A1 WO2022210055 A1 WO 2022210055A1
Authority
WO
WIPO (PCT)
Prior art keywords
pressure
sensitive adhesive
adhesive sheet
adherend
adhesive layer
Prior art date
Application number
PCT/JP2022/012878
Other languages
English (en)
Japanese (ja)
Inventor
望花 ▲高▼島
香織 赤松
Original Assignee
日東電工株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 日東電工株式会社 filed Critical 日東電工株式会社
Priority to JP2023510994A priority Critical patent/JPWO2022210055A1/ja
Publication of WO2022210055A1 publication Critical patent/WO2022210055A1/fr

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
    • C09J11/02—Non-macromolecular additives
    • C09J11/06—Non-macromolecular additives organic
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J201/00—Adhesives based on unspecified macromolecular compounds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
    • C09J7/38—Pressure-sensitive adhesives [PSA]
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J9/00—Adhesives characterised by their physical nature or the effects produced, e.g. glue sticks
    • C09J9/02—Electrically-conducting adhesives

Definitions

  • the present invention relates to an adhesive sheet, a joined body, and a method for separating the joined body.
  • Patent Documents 1 and 2 are cited as documents disclosing prior art related to this type of removable pressure-sensitive adhesive sheet.
  • Patent Documents 1 and 2 describe adhesive products with tabs that include an extensible adhesive sheet and tabs provided at the ends of the adhesive sheet.
  • a pressure-sensitive adhesive sheet provided with an electro-peeling pressure-sensitive adhesive layer made of an electro-peeling pressure-sensitive adhesive composition that is peeled off by applying a voltage to the adhesive layer is known (Patent Document 3).
  • the present invention was conceived under such circumstances, and an object of the present invention is to provide a pressure-sensitive adhesive sheet having excellent adhesive strength and better releasability. It is another object of the present invention to provide a bonded body having excellent adhesive strength and good releasability, and a method for separating such a bonded body.
  • the present invention has the following configurations.
  • a strip-shaped pressure-sensitive adhesive sheet comprising a pressure-sensitive adhesive layer, A pressure-sensitive adhesive sheet comprising an inclined portion formed in a tapered shape, the width of which tapers toward one end in the longitudinal direction of the pressure-sensitive adhesive sheet.
  • the present invention provides a pressure-sensitive adhesive sheet and a joined body having excellent adhesive strength and good releasability. Further, the present invention provides a method for separating a joined body with good peelability.
  • FIG. 1 is a schematic top view of a pressure-sensitive adhesive sheet according to one embodiment of the present invention.
  • FIG. 2 is a perspective view schematically showing another configuration example (embodiment) of the adhesive sheet according to the embodiment of the present invention.
  • (a), (b) and (c) of FIG. 3 are schematic cross-sectional views of a pressure-sensitive adhesive sheet according to one embodiment of the present invention.
  • FIG. 4 is a cross-sectional view showing an example of the laminated structure of the pressure-sensitive adhesive sheet of the present invention.
  • FIG. 5 is a cross-sectional view showing another example of the laminated structure of the adhesive sheet of the present invention.
  • FIG. 6 is a schematic cross-sectional view showing an example of an end portion of the pressure-sensitive adhesive sheet shown in FIG. 1.
  • FIG. 7 is a schematic cross-sectional view of a joined body in which a first adherend and a second adherend are bonded together with an adhesive sheet according to a modification of one embodiment of the present invention.
  • FIG. 8 is a top view schematically showing one configuration example (embodiment) of the pressure-sensitive adhesive sheet attached to the first adherend and the second adherend.
  • FIG. 9 is a diagram for explaining a method for producing a test sample in the example.
  • the term "band shape” means a shape that extends linearly and has a width (length in a direction perpendicular to the linearly extending direction).
  • the band shape is a shape having a predetermined length in the linearly extending direction and a width shorter than the length, and is a concept including a rectangular shape and a strip shape. Therefore, the strip shape can be rephrased as a long shape.
  • the belt shape according to one aspect has a linearly extending shape, but may have a curved shape, and may include a linearly extending portion and a curvedly extending portion. .
  • the width of the band shape may not be constant.
  • the term "tab” is used as a term that means a "knob” that serves as a starting point (starting point of pulling) when pulling the adhesive sheet, and other elements (shape, material, etc.) are not particularly limited. .
  • the tab has a size that can be gripped with fingers and a shape (for example, a flat rectangular shape) that can be gripped with fingers. Therefore, it is not necessary to have a size that can be gripped with fingers, and there are no restrictions on the shape.
  • a tab with perforations can have a microscopic size as hooks can be passed through the perforations and pulled.
  • a typical tab is planar and continuous from the adhesive sheet, and preferably does not elongate when pulled, or if it does elongate, it has a lower elongation than the adhesive sheet.
  • a pressure-sensitive adhesive sheet is a strip-shaped pressure-sensitive adhesive sheet having a pressure-sensitive adhesive layer, and is formed into a tapered shape in which the width tapers toward one end in the longitudinal direction of the pressure-sensitive adhesive sheet. It has a slope.
  • FIG. 1 is a top view schematically showing one configuration example (embodiment) of a pressure-sensitive adhesive sheet according to an embodiment of the present invention.
  • the pressure-sensitive adhesive sheet 100 shown in FIG. 1 has a tapered portion 40 formed at one end in the longitudinal direction of the pressure-sensitive adhesive sheet 100 so that the width of the pressure-sensitive adhesive sheet 100 tapers toward one end 41 .
  • the inclined portion 40 is indicated by a dot with an inclined length L2.
  • the width is linearly tapered toward one end 41 (hereinafter simply referred to as "end 41"), but it may be tapered in a curved line.
  • the pressure-sensitive adhesive sheet according to the embodiment of the present invention may have tabs provided at the ends.
  • end 41 may be provided with tab 50 having length L3 (tab length L3).
  • tab length L3 tab length L3
  • FIG. 2 is a perspective view schematically showing another configuration example (embodiment) of the adhesive sheet according to the embodiment of the present invention.
  • the pressure-sensitive adhesive sheet 100 shown in FIG. 2 further includes a base material 20 and pressure-sensitive adhesive layers 10 disposed on both sides of the base material 20 .
  • the other end of the adhesive sheet 100 in the longitudinal direction may or may not have the inclined portion 40.
  • the pressure-sensitive adhesive sheet 100 having such a shape can be applied to rectangular adherends (e.g., personal computers, mobile phones, smartphones, digital cameras, tablet PCs, portable music players, portable game machines, housings of electronic devices such as chargers, etc.). It can exhibit good adhesion to bodies and parts (eg, batteries, etc.). Moreover, the adhesive sheet 100 has a belt shape.
  • rectangular adherends e.g., personal computers, mobile phones, smartphones, digital cameras, tablet PCs, portable music players, portable game machines, housings of electronic devices such as chargers, etc.
  • bodies and parts eg, batteries, etc.
  • the adhesive sheet 100 has a belt shape.
  • the total length L of the pressure-sensitive adhesive sheet 100 is the sum of the slanted length L2, which is the length of the slanted portion, and the length L1 other than the slanted portion.
  • the ratio of the length of the inclined portion 40 (the inclined length L2) to the length L of the adhesive sheet 100 in the longitudinal direction (the total length L) is 5% or more.
  • the ratio of the slope length L2 to the length L (total length L) of the adhesive sheet in the longitudinal direction is more preferably 10% or more, and even more preferably 20% or more. Moreover, from the viewpoint of maintaining the adhesive force, the ratio of the slope length L2 to the length L (total length L) of the adhesive sheet in the longitudinal direction is preferably 100% or less, more preferably 70% or less.
  • the ratio of the width W2 of the end portion to the width W of the adhesive sheet is preferably 90% or less, more preferably 75% or less, and even more preferably 50% or less.
  • the ratio of the width W2 of the end portion is 50% or less.
  • the ratio of the width W2 of the end portion to the width W of the adhesive sheet is more preferably 10% or more, more preferably 20% or more.
  • the width W of the adhesive sheet is the width of the portion of the strip-shaped adhesive sheet other than the inclined portion.
  • the slope length L2 is equal to the length L (total length L) of the adhesive sheet in the longitudinal direction
  • the width W2 of one end and the width of the opposite end of the adhesive sheet are equal to the width of the adhesive sheet.
  • the width of the adhesive sheet 100 tapers toward the end 41, and the width W2 of the end 41 shown in FIG.
  • the lengths of the slanted widths W1 and W3 may be the same or different, it is preferable that the slanted widths W1 and W3 have the same length from the viewpoint of adhesiveness.
  • a pressure-sensitive adhesive sheet with a ratio (L/W) of about 2 or more tends to be excellent in releasability and handleability.
  • the upper limit of the ratio (L/W) is not particularly limited, the ratio (L/W) can be approximately 50 or less from the viewpoint of strength, handleability, and the like.
  • the pressure-sensitive adhesive sheet according to the embodiment of the present invention has a belt shape, and may have a belt-like portion in part, for example.
  • the pressure-sensitive adhesive sheet typically has a shape extending linearly as in the above embodiment, but is not limited thereto, and may have a shape extending in a curved line or a shape having a straight line and a curved line (for example, a dogleg shape). or U-shaped, arc-shaped, wavy, zigzag-shaped, etc.).
  • the pressure-sensitive adhesive sheet of the present embodiment may be, for example, wound into a roll, a sheet, or a sheet. Alternatively, it may be a pressure-sensitive adhesive sheet processed into various shapes.
  • the meaning of an "adhesive tape" shall also be included in an "adhesive sheet.” That is, the adhesive sheet of this embodiment may be an adhesive tape having a tape-like form.
  • a pressure-sensitive adhesive sheet according to an embodiment of the present invention includes a pressure-sensitive adhesive layer.
  • FIG. 3(a) is a schematic cross-sectional view of an adhesive sheet according to one embodiment of the present invention.
  • the pressure-sensitive adhesive sheet 110 shown in FIG. 3( a ) may be a substrate-less double-sided pressure-sensitive adhesive sheet comprising only the pressure-sensitive adhesive layer 10 .
  • the pressure-sensitive adhesive sheet according to the embodiment of the present invention may further include a base material and may have a structure including a pressure-sensitive adhesive layer arranged on at least one side of the base material.
  • FIG. 3(b) is a schematic cross-sectional view of an adhesive sheet according to one embodiment of the present invention.
  • This pressure-sensitive adhesive sheet 120 further comprises a substrate 20 , and pressure-sensitive adhesive layers 10 arranged on both sides of the substrate 20 .
  • FIG. 3(c) is a schematic cross-sectional view of an adhesive sheet according to one embodiment of the present invention.
  • This adhesive sheet 130 comprises a substrate 20 and an adhesive layer 10 arranged on one side of the substrate 20 .
  • the pressure-sensitive adhesive sheets shown in FIGS. 3(b) and 3(c) may have extensions that extend beyond the pressure-sensitive adhesive layer 10 in the surface spreading direction of the substrate 20 and are exposed. The extension may be the tab 50 in FIG.
  • the pressure-sensitive adhesive layer that constitutes the pressure-sensitive adhesive sheet exhibits adhesiveness when pressed.
  • the pressure-sensitive adhesive sheet (substantially the pressure-sensitive adhesive layer) may be a pressure-sensitive adhesive sheet exhibiting adhesiveness at room temperature (25° C.) or a pressure-sensitive adhesive sheet exhibiting adhesiveness upon heating.
  • a pressure-sensitive adhesive sheet that develops adhesiveness by heating can exhibit adhesiveness in a state where it is cooled to room temperature after heating.
  • the adhesive layer 10 may be an electro-peelable adhesive layer.
  • the adhesive layer 10 may be an electro-peeling adhesive layer. It is preferable that the pressure-sensitive adhesive sheet including the electro-peeling pressure-sensitive adhesive layer (electro-peeling pressure-sensitive adhesive sheet) firmly joins members when no voltage is applied, and can be peeled off with a small force when voltage is applied. Since the electrically peelable pressure-sensitive adhesive sheet has the inclined portion 40, the stress required to start peeling can be further reduced when the sheet is peeled from the outer edge portion of the portion joined by the inclined portion.
  • Cleavage peeling can be achieved by applying a slight stress to a portion of the interface between the pressure-sensitive adhesive layer and the adherend, preferably to the outer edge of the portion joined by the inclined portion when a voltage is applied. Therefore, there is no need to apply a large stress to part of the interface between the pressure-sensitive adhesive layer and the adherend for peeling, and there is an advantage that the adherend is not deformed.
  • the term "cleavage peeling” refers to peeling along the interface between the pressure-sensitive adhesive layer and the adherend.
  • the entire interface between the adhesive layer and the adherend can be easily peeled off by cleavage peeling, and there is no need to apply a large stress to a part of the interface between the adhesive layer and the adherend for peeling. It has the advantage of not deforming the adherend.
  • the cleavage exfoliation may or may not be spontaneous exfoliation, but is preferably spontaneous exfoliation.
  • the spontaneous peeling refers to peeling (cleavage) along the interface between the adherend and the adhesive layer, and peeling naturally without applying stress to a part of the interface between the adhesive layer and the adherend.
  • the pressure-sensitive adhesive sheet of the present embodiment has a base material, a conductive layer, a conductive base material, an intermediate layer, an undercoat layer, etc. in addition to the pressure-sensitive adhesive layer.
  • the pressure-sensitive adhesive sheet of this embodiment may further include another pressure-sensitive adhesive layer that does not have electrical peeling properties when the pressure-sensitive adhesive layer 10 is an electrically peeling pressure-sensitive adhesive layer.
  • the electrically peelable pressure-sensitive adhesive sheet of the present embodiment may have an electrically peelable pressure-sensitive adhesive layer and a separator (release liner) for the purpose of protecting the surface of the pressure-sensitive adhesive layer. , are not included in the electropeelable pressure-sensitive adhesive sheet of the present embodiment.
  • the structure of the pressure-sensitive adhesive sheet of the present embodiment when the pressure-sensitive adhesive layer 10 is an electro-peelable pressure-sensitive adhesive layer is not particularly limited.
  • Sheet X3 is preferred.
  • the pressure-sensitive adhesive sheet X2 is a double-sided pressure-sensitive adhesive sheet with a substrate having a layer configuration of a pressure-sensitive adhesive layer 2, a conductive substrate 5 (a substrate 3 and a conductive layer 4), and an electrically peeling pressure-sensitive adhesive layer 1.
  • the adhesive sheet X3 includes an adhesive layer 2, a conductive base material 5 (a base material 3 and a conductive layer 4), an electrically peeling adhesive layer 1, a conductive base material 5 (a base material 3 and a conductive layer 4), It is a double-sided pressure-sensitive adhesive sheet with a base material having a layer structure of pressure-sensitive adhesive layer 2 .
  • the base material 3 is not essential, and the conductive layer 4 alone may be used.
  • the single-sided adhesive sheet which does not provide the adhesive layer 2 may be sufficient.
  • the pressure-sensitive adhesive sheet X2 may have more than two exposed extensions, which may be tabs 50 .
  • the electric peeling pressure-sensitive adhesive sheet may be a double-sided electric peeling pressure-sensitive adhesive sheet as in the modification shown in FIG.
  • the electrically-peelable pressure-sensitive adhesive sheet shown in FIG. 7 has a laminated structure in which an electrically-releasing base material 5 and an adhesive layer 2 are laminated on both surfaces of an electrically-peelable pressure-sensitive adhesive layer 1 .
  • the double-sided electrical peeling pressure-sensitive adhesive sheet is attached to the first adherend 15 on one side of the pressure-sensitive adhesive layer 2 side, and adheres to the second adherend 15 on the other side of the pressure-sensitive adhesive layer 2 side. may be adhered to the adherend 16.
  • the double-sided electrically peelable pressure-sensitive adhesive sheet has, for example, as shown in FIG.
  • the extension may be the tab 50 .
  • the conductive layer 4 in the extended portion is preferably not exposed from the viewpoint of corrosion prevention, and may be covered with the electro-peeling pressure-sensitive adhesive layer 1 .
  • the extension may be the tab 50 .
  • the substrate 3 is not particularly limited, but may be a paper-based substrate such as paper, a fiber-based substrate such as cloth or non-woven fabric, various plastics (polyolefin-based resins such as polyethylene and polypropylene, polyester-based resins such as polyethylene terephthalate, poly Examples include plastic base materials such as films and sheets made of acrylic resins such as methyl methacrylate, laminates thereof, and the like.
  • the substrate may have the form of a single layer, or may have the form of multiple layers.
  • the base material may be subjected to various treatments such as back surface treatment, antistatic treatment, and undercoating treatment, if necessary.
  • the conductive layer 4 is not particularly limited as long as it is a layer having conductivity, but metal (e.g., aluminum, magnesium, copper, iron, tin, gold, etc.) foil, metal plate (e.g., aluminum, magnesium, copper, It may be a metal-based substrate such as iron, tin, silver, etc., a conductive polymer, or the like, or may be a metal deposition film provided on the substrate 3 .
  • metal e.g., aluminum, magnesium, copper, iron, tin, gold, etc.
  • metal plate e.g., aluminum, magnesium, copper
  • It may be a metal-based substrate such as iron, tin, silver, etc., a conductive polymer, or the like, or may be a metal deposition film provided on the substrate 3 .
  • the conductive base material 5 is not particularly limited as long as it is a base material having a conductive layer (conducting current), and examples thereof include those having a metal layer formed on the surface of the base material. Examples thereof include those in which a metal layer is formed on the surface of a substrate by a method such as plating, chemical vapor deposition, or sputtering. Examples of the metal layer include the above-exemplified metals, metal plates, conductive polymers, and the like.
  • the adherends on both sides are preferably adherends having metal adherend surfaces.
  • the adherend on the side of the electro-peelable pressure-sensitive adhesive layer 1 is preferably an adherend having a metal adherend surface.
  • Examples of the metal adhering surface include conductive surfaces made of metals containing aluminum, copper, iron, magnesium, tin, gold, silver, lead, etc. as main components.
  • a surface consisting of The adherend having a metal adherend surface includes, for example, sheets, parts, and plates made of a metal containing aluminum, copper, iron, magnesium, tin, gold, silver, lead, or the like as a main component.
  • Examples of the adherend other than the adherend having a metal adherend surface include, but are not particularly limited to, paper, cloth, fiber sheets such as nonwoven fabric, and various plastic films and sheets.
  • the thickness of the electro-peelable pressure-sensitive adhesive layer 1 is preferably 1 ⁇ m or more and 1000 ⁇ m or less.
  • the upper limit of the thickness of the electro-peelable pressure-sensitive adhesive layer 1 is more preferably 500 ⁇ m, more preferably 100 ⁇ m, particularly preferably 30 ⁇ m, and the lower limit is more preferably 3 ⁇ m, further preferably 5 ⁇ m. , particularly preferably 8 ⁇ m.
  • the adhesive sheet is a substrate-less double-sided adhesive sheet (adhesive sheet 110 shown in FIG.
  • the thickness of the peelable pressure-sensitive adhesive layer) is the thickness of the pressure-sensitive adhesive sheet.
  • the thickness of the pressure-sensitive adhesive layer 2 is preferably 1 ⁇ m or more and 2000 ⁇ m or less from the viewpoint of adhesive strength.
  • the upper limit of the thickness of the pressure-sensitive adhesive layer 2 is more preferably 1000 ⁇ m, more preferably 500 ⁇ m, particularly preferably 100 ⁇ m, and the lower limit is more preferably 3 ⁇ m, still more preferably 5 ⁇ m, and particularly preferably. is 8 ⁇ m.
  • the thickness of the base material 3 is preferably 10 ⁇ m or more and 1000 ⁇ m or less.
  • the upper limit of the thickness is more preferably 500 ⁇ m, still more preferably 300 ⁇ m, particularly preferably 100 ⁇ m, and the lower limit is more preferably 12 ⁇ m, still more preferably 25 ⁇ m.
  • the thickness of the conductive layer 4 is preferably 0.001 ⁇ m or more and 1000 ⁇ m or less.
  • the upper limit of the thickness is more preferably 500 ⁇ m, more preferably 300 ⁇ m, still more preferably 50 ⁇ m, still more preferably 10 ⁇ m, and the lower limit is more preferably 0.01 ⁇ m, more preferably 0.01 ⁇ m.
  • the thickness of the conductive substrate 5 is preferably 10 ⁇ m or more and 1000 ⁇ m or less.
  • the upper limit of the thickness is more preferably 500 ⁇ m, still more preferably 300 ⁇ m, particularly preferably 100 ⁇ m, and the lower limit is more preferably 12 ⁇ m, still more preferably 25 ⁇ m.
  • the surface of the pressure-sensitive adhesive layer (electro-peeling pressure-sensitive adhesive layer and other pressure-sensitive adhesive layers) of the pressure-sensitive adhesive sheet of this embodiment may be protected by a separator (release liner).
  • the release liner is not particularly limited, but a release liner in which the surface of the substrate (liner substrate) such as paper or plastic film is silicone-treated, or a release liner in which the surface of the substrate (liner substrate) such as paper or plastic film is polyolefin.
  • a release liner laminated with a base resin and the like can be used.
  • the thickness of the release liner is not particularly limited, but is preferably 10 ⁇ m or more and 100 ⁇ m or less.
  • the thickness of the adhesive sheet of this embodiment is preferably 20 ⁇ m or more and 3000 ⁇ m or less.
  • the upper limit of the thickness is more preferably 1000 ⁇ m, more preferably 300 ⁇ m, particularly preferably 200 ⁇ m, and the lower limit is more preferably 30 ⁇ m, still more preferably 50 ⁇ m.
  • the thickness of the adhesive sheet is preferably 50 ⁇ m or more and 2000 ⁇ m or less.
  • the upper limit of the thickness is more preferably 1000 ⁇ m, more preferably 200 ⁇ m, and the lower limit is more preferably 80 ⁇ m, still more preferably 100 ⁇ m.
  • the thickness of the adhesive sheet is preferably 100 ⁇ m or more and 3000 ⁇ m or less.
  • the upper limit of the thickness is more preferably 1000 ⁇ m, more preferably 300 ⁇ m, and the lower limit is more preferably 150 ⁇ m, still more preferably 200 ⁇ m.
  • the pressure-sensitive adhesive layer can be formed from a pressure-sensitive adhesive composition, and the pressure-sensitive adhesive composition preferably contains a polymer.
  • the pressure-sensitive adhesive layer may be an electro-peelable pressure-sensitive adhesive layer having a property that the adhesive force is lowered by voltage application.
  • the pressure-sensitive adhesive layer formed from the pressure-sensitive adhesive composition according to the embodiment of the present invention preferably has excellent heat resistance.
  • a pressure-sensitive adhesive layer with excellent heat resistance can also be used in the manufacturing process of electronic devices exposed to high temperatures.
  • the pressure-sensitive adhesive layer is preferably an electro-peeling pressure-sensitive adhesive layer whose adhesive strength is reduced by the application of voltage, and the electro-peeling pressure-sensitive adhesive layer preferably contains a polymer and an electrolyte. more preferably contains a polymer and an ionic liquid.
  • the adhesive layer is an electro-peelable adhesive layer, the adhesive force is sufficiently lowered by voltage application, so that cleavage separation is possible.
  • a pressure-sensitive adhesive composition according to an embodiment of the present invention will be described below.
  • the adhesive strength when no voltage is applied is sometimes referred to as “initial adhesive strength”.
  • the property that the adhesive force is reduced by voltage application is called “electro-peeling property”, and a large reduction rate of adhesive force by voltage application is sometimes called “excellent electro-peeling property”.
  • the adhesive composition of this embodiment preferably contains a polymer.
  • the polymer is not particularly limited as long as it is a general organic polymer compound, and is, for example, a polymer or partial polymer of monomers.
  • the monomer may be a single monomer or a mixture of two or more monomers.
  • a partially polymerized product means a polymerized product in which at least a part of a monomer or a monomer mixture is partially polymerized.
  • the polymer in the present embodiment is generally used as an adhesive and is not particularly limited as long as it has adhesiveness.
  • examples include acrylic polymers, rubber polymers, vinyl alkyl ether polymers, silicone polymers, and polyester polymers. , polyamide-based polymers, urethane-based polymers, fluorine-based polymers, and epoxy-based polymers.
  • a polymer can be used individually or in combination of 2 or more types.
  • the relative dielectric constant of the polymer is high in order to increase the relative dielectric constant of the components other than the ionic liquid and improve the electro-peeling properties.
  • the polymer in this embodiment preferably contains at least one selected from the group consisting of polyester polymers and acrylic polymers having carboxyl groups and/or hydroxyl groups. Since the polyester-based polymer has a hydroxyl group that is easily polarized at the terminal, and the acrylic polymer having a carboxyl group and/or a hydroxyl group is easy to polarize the carboxyl group and/or the hydroxyl group, these polymers are used.
  • the total content of the polyester polymer and the acrylic polymer having a carboxyl group and/or a hydroxyl group in the polymer of the present embodiment is preferably 60% by mass or more, more preferably 80% by mass or more. preferable.
  • the polymer in this embodiment is preferably an acrylic polymer. That is, the pressure-sensitive adhesive composition of the present embodiment is preferably an acrylic pressure-sensitive adhesive composition containing an acrylic polymer as a polymer.
  • the acrylic polymer preferably contains a monomer unit derived from a (meth)acrylic acid alkyl ester (formula (1) below) having an alkyl group having 1 to 14 carbon atoms. Such monomer units are suitable for obtaining high initial adhesive strength.
  • the pressure-sensitive adhesive layer is an electrically peeling pressure-sensitive adhesive layer
  • the number of carbon atoms in the alkyl group R b in the following formula (1) is is preferably small, particularly preferably 8 or less, more preferably 4 or less.
  • CH2 C(Ra) COORb ( 1) [R a in formula (1) is a hydrogen atom or a methyl group, and R b is an optionally substituted alkyl group having 1 to 14 carbon atoms]
  • Examples of (meth)acrylic acid alkyl esters having an alkyl group having 1 to 14 carbon atoms include methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, isopropyl (meth)acrylate, n-butyl ( meth)acrylate, sec-butyl (meth)acrylate, 1,3-dimethylbutyl acrylate, pentyl (meth)acrylate, isopentyl (meth)acrylate, hexyl (meth)acrylate, 2-ethylbutyl (meth)acrylate, heptyl (meth)acrylate ) acrylate, n-octyl (meth) acrylate, isooctyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, n-nonyl (meth) acrylate, isononyl (meth) acrylate,
  • n-butyl acrylate, 2-ethylhexyl acrylate, isononyl acrylate and 2-methoxyethyl acrylate are preferred.
  • the (meth)acrylic acid alkyl esters having an alkyl group of 1 to 14 carbon atoms can be used alone or in combination of two or more.
  • the ratio of the (meth)acrylic acid alkyl ester having an alkyl group having 1 to 14 carbon atoms to the total monomer components (100% by mass) constituting the acrylic polymer is not particularly limited, but is preferably 70% by mass or more, more preferably. is 80% by mass or more, more preferably 85% by mass or more.
  • a large initial adhesive strength can be easily obtained.
  • the acrylic polymer in addition to the monomer unit derived from (meth)acrylic acid alkyl ester having an alkyl group having 1 to 14 carbon atoms, for the purpose of improving cohesion, heat resistance, crosslinkability, etc. It preferably contains a monomer unit derived from a copolymerizable polar group-containing monomer.
  • a monomer unit can provide cross-linking points and is suitable for obtaining a large initial adhesive strength.
  • the pressure-sensitive adhesive layer is an electro-peelable pressure-sensitive adhesive layer
  • the monomer unit derived from a polar group-containing monomer is used from the viewpoint of increasing the dielectric constant of components other than the ionic liquid and improving the electro-peeling properties. preferably included.
  • Polar group-containing monomers include, for example, carboxyl group-containing monomers, hydroxyl group-containing monomers, cyano group-containing monomers, vinyl group-containing monomers, aromatic vinyl monomers, amide group-containing monomers, imide group-containing monomers, amino group-containing monomers, epoxy group-containing monomers, vinyl ether monomers, N-acryloylmorpholine, sulfo group-containing monomers, phosphoric acid group-containing monomers, acid anhydride group-containing monomers, and the like.
  • carboxyl group-containing monomers, hydroxyl group-containing monomers, and amide group-containing monomers are preferable, and carboxyl group-containing monomers are particularly preferable, from the viewpoint of excellent cohesiveness.
  • a carboxyl group-containing monomer is particularly suitable for obtaining a large initial adhesive strength.
  • Polar group-containing monomers can be used alone or in combination of two or more.
  • Carboxyl group-containing monomers include, for example, acrylic acid, methacrylic acid, carboxyethyl (meth)acrylate, carboxypentyl (meth)acrylate, itaconic acid, maleic acid, fumaric acid, crotonic acid, and isocrotonic acid. Acrylic acid is particularly preferred. Carboxyl group-containing monomers can be used alone or in combination of two or more.
  • hydroxyl group-containing monomers examples include 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, 6-hydroxyhexyl (meth)acrylate, 8-hydroxyoctyl ( meth)acrylate, 10-hydroxydecyl (meth)acrylate, 12-hydroxylauryl (meth)acrylate, (4-hydroxymethylcyclohexyl)methyl (meth)acrylate, N-methylol (meth)acrylamide, vinyl alcohol, allyl alcohol , 2-hydroxyethyl vinyl ether, 4-hydroxybutyl vinyl ether, and diethylene glycol monovinyl ether. 2-Hydroxyethyl (meth)acrylate and 4-hydroxybutyl (meth)acrylate are particularly preferred.
  • a hydroxyl group-containing monomer can be used individually or in combination of 2 or more types.
  • amide group-containing monomers examples include acrylamide, methacrylamide, N-vinylpyrrolidone, N,N-dimethylacrylamide, N,N-dimethylmethacrylamide, N,N-diethylacrylamide, N,N-diethylmethacrylamide, N , N′-methylenebisacrylamide, N,N-dimethylaminopropylacrylamide, N,N-dimethylaminopropylmethacrylamide, and diacetoneacrylamide.
  • Amido group-containing monomers can be used alone or in combination of two or more.
  • cyano group-containing monomers examples include acrylonitrile and methacrylonitrile.
  • vinyl group-containing monomers examples include vinyl esters such as vinyl acetate, vinyl propionate, and vinyl laurate, and vinyl acetate is particularly preferred.
  • aromatic vinyl monomers examples include styrene, chlorostyrene, chloromethylstyrene, ⁇ -methylstyrene, and other substituted styrenes.
  • imide group-containing monomers examples include cyclohexylmaleimide, isopropylmaleimide, N-cyclohexylmaleimide, and itaconimide.
  • amino group-containing monomers examples include aminoethyl (meth)acrylate, N,N-dimethylaminoethyl (meth)acrylate, and N,N-dimethylaminopropyl (meth)acrylate.
  • epoxy group-containing monomers examples include glycidyl (meth)acrylate, methylglycidyl (meth)acrylate, and allyl glycidyl ether.
  • vinyl ether monomers examples include methyl vinyl ether, ethyl vinyl ether, and isobutyl vinyl ether.
  • the ratio of the polar group-containing monomer to the total monomer components (100% by mass) constituting the acrylic polymer is preferably 0.1% by mass or more and 35% by mass or less.
  • the upper limit of the ratio of the polar group-containing monomer is more preferably 25% by mass, more preferably 20% by mass, and the lower limit is more preferably 0.5% by mass, further preferably 1% by mass. , particularly preferably 2% by weight.
  • the ratio of the polar group-containing monomer is 30% by mass or less, it becomes easy to prevent the electrode-peeling pressure-sensitive adhesive layer from excessively adhering to the adherend and causing heavy release.
  • the amount is 2% by mass or more and 20% by mass or less, it becomes easy to achieve both the releasability from the adherend and the adhesion between the electropeelable pressure-sensitive adhesive layer and other layers.
  • a polyfunctional monomer may be included in order to introduce a crosslinked structure into the acrylic polymer and facilitate the acquisition of the necessary cohesive force.
  • polyfunctional monomers examples include ethylene glycol di(meth)acrylate, diethylene glycol di(meth)acrylate, tetraethylene glycol di(meth)acrylate, neopentyl glycol di(meth)acrylate, 1,6-hexanediol di( meth)acrylate, trimethylolpropane tri(meth)acrylate, pentaerythritol tri(meth)acrylate, dipentaerythritol hexa(meth)acrylate, divinylbenzene, and N,N'-methylenebisacrylamide.
  • a polyfunctional monomer can be used individually or in combination of 2 or more types.
  • the content of the polyfunctional monomer with respect to the total monomer components (100% by mass) constituting the acrylic polymer is preferably 0.1% by mass or more and 15% by mass or less.
  • the upper limit of the polyfunctional monomer content is more preferably 10% by mass, and the lower limit is more preferably 3% by mass.
  • the content of the polyfunctional monomer is 0.1% by mass or more, the flexibility and adhesiveness of the electrical peeling pressure-sensitive adhesive layer are likely to be improved, which is preferable.
  • the content of the polyfunctional monomer is 15% by mass or less, the cohesive force does not become too high, making it easier to obtain appropriate adhesiveness.
  • Polyester-based polymers are typically composed of polyvalent carboxylic acids such as dicarboxylic acids and derivatives thereof (hereinafter also referred to as “polyvalent carboxylic acid monomers”), and polyhydric alcohols such as diols and derivatives thereof (hereinafter referred to as “polyhydric alcohol monomers”). ”) is a polymer having a condensed structure.
  • polyvalent carboxylic acid monomers include, but are not limited to, adipic acid, azelaic acid, dimer acid, sebacic acid, 1,4-cyclohexanedicarboxylic acid, 1,3-cyclohexanedicarboxylic acid, 1,2-cyclohexanedicarboxylic acid, 4-methyl-1,2-cyclohexanedicarboxylic acid, dodecenylsuccinic anhydride, fumaric acid, succinic acid, dodecanedioic acid, hexahydrophthalic anhydride, tetrahydrophthalic anhydride, etc., maleic acid, maleic anhydride, itaconic acid, citraconic acid , and derivatives thereof and the like can be used.
  • Polyvalent carboxylic acid monomers can be used alone or in combination of two or more.
  • polyhydric alcohol monomers include, but are not limited to, ethylene glycol, 1,2-propylene glycol, 1,3-propanediol, 2-methyl-1,3-propanediol, and 1,2-butane. Diol, 1,3-butanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, 3-methyl-1,5-pentanediol, neopentyl glycol, diethylene glycol, diethylene glycol, Propylene glycol, 2,2,4-trimethyl-1,5-pentanediol, 2-ethyl-2-butylpropanediol, 1,9-nonanediol, 2-methyloctanediol, 1,10-decanediol, and these can be used.
  • a polyhydric alcohol monomer can be used individually or in combination of 2 or more types.
  • the polymer of the present embodiment may contain an ionic polymer.
  • An ionic polymer is a polymer with ionic functional groups. By including an ionic polymer in the polymer, the dielectric constant of the polymer increases and the electro-peeling property improves.
  • the content of the ionic polymer is preferably 0.05 parts by mass or more and 2 parts by mass or less with respect to 100 parts by mass of the polymer.
  • the polymer can be obtained by (co)polymerizing monomer components.
  • the polymerization method is not particularly limited, but includes solution polymerization, emulsion polymerization, bulk polymerization, suspension polymerization, photopolymerization (active energy ray polymerization), and the like.
  • the solution polymerization method is preferable from the viewpoint of cost and productivity.
  • the polymer may be a random copolymer, a block copolymer, an alternating copolymer, a graft copolymer, or the like.
  • the solution polymerization method is not particularly limited, but examples include a method of dissolving a monomer component, a polymerization initiator, etc. in a solvent and heating and polymerizing to obtain a polymer solution containing the polymer.
  • solvents can be used as the solvent used in the solution polymerization method.
  • solvents include aromatic hydrocarbons such as toluene, benzene, and xylene; esters such as ethyl acetate and n-butyl acetate; Alicyclic hydrocarbons such as cyclohexane and methylcyclohexane; organic solvents such as ketones such as methyl ethyl ketone and methyl isobutyl ketone;
  • a solvent can be used individually or in combination of 2 or more types.
  • the amount of the solvent used is not particularly limited, but is preferably 10 parts by mass or more and 1000 parts by mass or less with respect to all the monomer components (100 parts by mass) constituting the polymer.
  • the upper limit of the amount of solvent used is more preferably 500 parts by mass, and the lower limit is more preferably 50 parts by mass.
  • the polymerization initiator used in the solution polymerization method is not particularly limited, but includes peroxide-based polymerization initiators, azo-based polymerization initiators, and the like.
  • Peroxide-based polymerization initiators are not particularly limited, but include peroxycarbonates, ketone peroxides, peroxyketals, hydroperoxides, dialkyl peroxides, diacyl peroxides, and peroxyesters.
  • the azo polymerization initiator is not particularly limited, but 2,2'-azobisisobutyronitrile, 2,2'-azobis-2-methylbutyronitrile, 2,2'-azobis(2,4- dimethylvaleronitrile), 2,2′-azobis(2-methylpropionate)dimethyl, 2,2′-azobis(4-methoxy-2,4-dimethylvaleronitrile), 1,1′-azobis(cyclohexane-1 -carbonitrile), 2,2′-azobis(2,4,4-trimethylpentane), 4,4′-azobis-4-cyanovaleric acid, 2,2′-azobis(2-amidinopropane) dihydrochloride, 2,2'-azobis[2-(5-methyl-2-imidazolin-2-yl)propane]dihydrochloride, 2,2'-azobis(2-methylpropionamidine) disulfate, 2,2'-azobis (N,N'-dimethyleneisobutylamidine) hydro
  • the amount of the polymerization initiator used is not particularly limited, but is preferably 0.01 parts by mass or more and 5 parts by mass or less with respect to all the monomer components (100 parts by mass) constituting the polymer.
  • the upper limit of the amount of the polymerization initiator used is more preferably 3 parts by mass, and the lower limit is more preferably 0.05 parts by mass.
  • the heating temperature for polymerization by heating is not particularly limited, but is, for example, 50°C or higher and 80°C or lower.
  • the heating time is not particularly limited, but is, for example, 1 hour or more and 24 hours or less.
  • the weight average molecular weight of the polymer is not particularly limited, it is preferably 100,000 or more and 5,000,000 or less.
  • the upper limit of the weight average molecular weight is more preferably 4,000,000, more preferably 3,000,000, and the lower limit is more preferably 200,000, still more preferably 300,000.
  • the weight-average molecular weight is 100,000 or more, the cohesive force becomes small, and it is possible to effectively suppress the problem that adhesive residue is left on the surface of the adherend after the electrically peeling pressure-sensitive adhesive layer is peeled off.
  • the weight average molecular weight is 5,000,000 or less, it is possible to effectively suppress the problem that the wettability of the surface of the adherend after peeling off the electropeeling pressure-sensitive adhesive layer becomes insufficient.
  • the weight average molecular weight is obtained by measuring by a gel permeation chromatography (GPC) method, and more specifically, for example, as a GPC measuring device, trade name "HLC-8220GPC” (manufactured by Tosoh Corporation). can be measured under the following conditions using and calculated from standard polystyrene conversion values.
  • GPC gel permeation chromatography
  • the glass transition temperature (Tg) of the polymer is not particularly limited, but when it is 0° C. or less, it is preferable because a decrease in initial adhesive strength can be suppressed, more preferably ⁇ 10° C. or less, and even more preferably ⁇ 20° C. or less. is.
  • a temperature of ⁇ 40° C. or less is particularly preferable, and most preferably ⁇ 50° C. or less, because the rate of decrease in adhesive strength due to voltage application is particularly large.
  • the above formula (Y) is a calculation formula when the polymer is composed of n kinds of monomer components of monomer 1, monomer 2, . . . , monomer n.
  • the glass transition temperature when forming a homopolymer means the glass transition temperature of a homopolymer of the monomer, and is formed using only a certain monomer (sometimes referred to as "monomer X") as a monomer component. It refers to the glass transition temperature (Tg) of a polymer. Specifically, numerical values are listed in "Polymer Handbook” (3rd edition, John Wiley & Sons, Inc., 1989).
  • the glass transition temperature (Tg) of a homopolymer not described in the literature refers to a value obtained by, for example, the following measuring method.
  • a reactor equipped with a thermometer, a stirrer, a nitrogen inlet tube and a reflux condenser was charged with 100 parts by mass of monomer X, 0.2 parts by mass of 2,2'-azobisisobutyronitrile and 200 parts by mass of ethyl acetate as a polymerization solvent. Parts by mass are added, and the mixture is stirred for 1 hour while nitrogen gas is introduced. After oxygen is removed from the polymerization system in this manner, the temperature is raised to 63° C. and the reaction is allowed to proceed for 10 hours. Then, it is cooled to room temperature to obtain a homopolymer solution having a solid concentration of 33% by mass.
  • the homopolymer solution is then cast onto a release liner and dried to form a test sample (sheet-like homopolymer) having a thickness of about 2 mm. Then, about 1 to 2 mg of this test sample was weighed in an aluminum open cell, and a temperature-modulated DSC (trade name "Q-2000" manufactured by T.A. Instruments) was used to measure the temperature in a nitrogen atmosphere of 50 ml/min. The reversing heat flow (specific heat component) behavior of the homopolymer is obtained at a heating rate of 5°C/min.
  • the glass transition temperature (Tg) of the homopolymer is defined as the temperature at which the curve of the part intersects.
  • the content of the polymer in the adhesive composition of the present embodiment is preferably 50% by mass or more and 99.9% by mass or less with respect to the total amount (100% by mass) of the adhesive composition, and the upper limit is more preferably 99.9% by mass. It is 5% by mass, more preferably 99% by mass, and the lower limit is more preferably 60% by mass, still more preferably 70% by mass.
  • the pressure-sensitive adhesive composition contains a solvent
  • the content of the polymer relative to the total amount of the pressure-sensitive adhesive composition excluding the solvent is preferably within the above range.
  • the electrolyte contained in the electro-peeling pressure-sensitive adhesive layer is a substance that can be ionized into anions and cations, and such electrolytes include ionic liquids, Examples include alkali metal salts and alkaline earth metal salts.
  • the electrolyte contained in the electrically detachable pressure-sensitive adhesive layer is preferably an ionic liquid. Ionic liquids are salts that are liquid at room temperature (about 25° C.) and contain anions and cations.
  • the ionic liquid in the present embodiment is not particularly limited as long as it is a molten salt that is composed of a pair of an anion and a cation and is liquid at 25° C. (normal temperature molten salt). Examples of anions and cations are given below. Of the ionic substances obtained by combining these, those that are liquid at 25°C are ionic liquids, and those that are solid at 25°C are not ionic liquids. is an ionic solid.
  • the anions of the ionic liquid are, for example, (FSO 2 ) 2 N ⁇ , (CF 3 SO 2 ) 2 N ⁇ , (CF 3 CF 2 SO 2 ) 2 N ⁇ , (CF 3 SO 2 ) 3 C ⁇ , Br ⁇ , AlCl 4 ⁇ , Al 2 Cl 7 ⁇ , NO 3 ⁇ , BF 4 ⁇ , PF 6 ⁇ , CH 3 COO ⁇ , CF 3 COO ⁇ , CF 3 CF 2 CF 2 COO ⁇ , CF 3 SO 3 ⁇ , CF 3 (CF 2 ) 3 SO 3 ⁇ , AsF 6 ⁇ , SbF 6 ⁇ , F(HF) n ⁇ and the like.
  • the anions include sulfonylimide compounds such as (FSO 2 ) 2 N ⁇ [bis(fluorosulfonyl)imide anion] and (CF 3 SO 2 ) 2 N ⁇ [bis(trifluoromethanesulfonyl)imide anion].
  • Anions are preferable because they are chemically stable and suitable for improving the electrical strippability.
  • nitrogen-containing onium, sulfur-containing onium, and phosphorus-containing onium cations are preferable because they are chemically stable and suitable for improving the electrical stripping property.
  • pyrrolidinium-based, and pyridinium-based cations are more preferred.
  • imidazolium cations include 1-methylimidazolium cation, 1-ethyl-3-methylimidazolium cation, 1-propyl-3-methylimidazolium cation, 1-butyl-3-methylimidazolium cation, 1 -Pentyl-3-methylimidazolium cation, 1-hexyl-3-methylimidazolium cation, 1-heptyl-3-methylimidazolium cation, 1-octyl-3-methylimidazolium cation, 1-nonyl-3- methylimidazolium cation, 1-undecyl-3-methylimidazolium cation, 1-dodecyl-3-methylimidazolium cation, 1-tridecyl-3-methylimidazolium cation, 1-tetradecyl-3-methylimidazolium cation, 1 -pentadecyl-3-methylimidazolium cation,
  • pyridinium-based cations examples include 1-butylpyridinium cation, 1-hexylpyridinium cation, 1-butyl-3-methylpyridinium cation, 1-butyl-4-methylpyridinium cation, and 1-octyl-4-methylpyridinium cation. etc.
  • pyrrolidinium-based cations examples include 1-ethyl-1-methylpyrrolidinium cations and 1-butyl-1-methylpyrrolidinium cations.
  • ammonium-based cations include tetraethylammonium cation, tetrabutylammonium cation, methyltrioctylammonium cation, tetradecyltrihexylammonium cation, glycidyltrimethylammonium cation and trimethylaminoethylacrylate cation.
  • the ionic liquid it is preferable to select a cation having a molecular weight of 160 or less as a constituent cation from the viewpoint of increasing the rate of decrease in adhesive strength when a voltage is applied.
  • Ionic liquids containing [fluorosulfonyl)imide anion] or (CF 3 SO 2 ) 2 N ⁇ [bis(trifluoromethanesulfonyl)imide anion] and a cation having a molecular weight of 160 or less are particularly preferred.
  • Examples of cations having a molecular weight of 160 or less include 1-methylimidazolium cation, 1-ethyl-3-methylimidazolium cation, 1-propyl-3-methylimidazolium cation, 1-butyl-3-methylimidazolium cation, 1-pentyl-3-methylimidazolium cation, 1-butylpyridinium cation, 1-hexylpyridinium cation, 1-butyl-3-methylpyridinium cation, 1-butyl-4-methylpyridinium cation, 1-ethyl-1-methyl pyrrolidinium cation, 1-butyl-1-methylpyrrolidinium cation, tetraethylammonium cation, glycidyltrimethylammonium cation, trimethylaminoethylacrylate cation, and the like.
  • R 1 in formula (2-A) represents a hydrocarbon group having 4 to 10 carbon atoms (preferably a hydrocarbon group having 4 to 8 carbon atoms, more preferably a hydrocarbon group having 4 to 6 carbon atoms), A heteroatom may be included, and R 2 and R 3 are the same or different and are a hydrogen atom or a hydrocarbon group having 1 to 12 carbon atoms (preferably a hydrocarbon group having 1 to 8 carbon atoms, more preferably a hydrocarbon group having 1 to 8 carbon atoms, more preferably to 6 hydrocarbon groups, more preferably hydrocarbon groups having 2 to 4 carbon atoms), which may contain a heteroatom. However, when the nitrogen atom forms a double bond with the adjacent carbon atom , R3 is absent.
  • R 4 in formula (2-B) represents a hydrocarbon group having 2 to 10 carbon atoms (preferably a hydrocarbon group having 2 to 8 carbon atoms, more preferably a hydrocarbon group having 2 to 6 carbon atoms), A heteroatom may be included, and R 5 , R 6 and R 7 are the same or different and are a hydrogen atom or a hydrocarbon group having 1 to 12 carbon atoms (preferably a hydrocarbon group having 1 to 8 carbon atoms, more preferably represents a hydrocarbon group having 2 to 6 carbon atoms, more preferably a hydrocarbon group having 2 to 4 carbon atoms, which may contain a heteroatom.
  • R 8 in formula (2-C) represents a hydrocarbon group having 2 to 10 carbon atoms (preferably a hydrocarbon group having 2 to 8 carbon atoms, more preferably a hydrocarbon group having 2 to 6 carbon atoms), A heteroatom may be included, and R 9 , R 10 and R 11 are the same or different and are a hydrogen atom or a hydrocarbon group having 1 to 16 carbon atoms (preferably a hydrocarbon group having 1 to 10 carbon atoms, more preferably represents a hydrocarbon group having 1 to 8 carbon atoms) and may contain a heteroatom.
  • X in formula (2-D) represents a nitrogen, sulfur or phosphorus atom
  • R 12 , R 13 , R 14 and R 15 are the same or different and are hydrocarbon groups having 1 to 16 carbon atoms ( Preferably a hydrocarbon group having 1 to 14 carbon atoms, more preferably a hydrocarbon group having 1 to 10 carbon atoms, still more preferably a hydrocarbon group having 1 to 8 carbon atoms, particularly preferably a hydrocarbon group having 1 to 6 carbon atoms. ) and may contain heteroatoms. However, when X is a sulfur atom, R 12 does not exist.
  • the molecular weight of the cation in the ionic liquid is, for example, 500 or less, preferably 400 or less, more preferably 300 or less, still more preferably 250 or less, particularly preferably 200 or less, and most preferably 160 or less. Moreover, it is usually 50 or more. It is thought that cations in the ionic liquid have the property of moving to the cathode side in the electro-peeling pressure-sensitive adhesive layer when a voltage is applied and being concentrated near the interface between the electro-peeling pressure-sensitive adhesive layer and the adherend. In the present invention, therefore, the adhesive strength during voltage application is lower than the initial adhesive strength, resulting in electro-peeling. A cation with a low molecular weight such as 500 or less facilitates migration of the cation to the cathode side in the electro-peelable pressure-sensitive adhesive layer, and is suitable for increasing the rate of decrease in adhesive force when voltage is applied.
  • ionic liquids include, for example, "Elexel AS-110”, “Elexel MP-442”, “Elexel IL-210”, “Elexel MP-471”, “Elexel MP-” manufactured by Daiichi Kogyo Seiyaku Co., Ltd. 456”, “Elexel AS-804”, “HMI-FSI” manufactured by Mitsubishi Materials Corporation, “CIL-312” and “CIL-313” manufactured by Nippon Carlit Co., Ltd., and the like.
  • the ionic conductivity of the ionic liquid is preferably 0.1 mS/cm or more. It is more preferably 1 mS/cm or more, still more preferably 3 mS/cm or more, still more preferably 5 mS/cm or more, even more preferably 10 mS/cm or more, and particularly preferably 15 mS/cm or more. and most preferably 20 mS/cm or more.
  • the adhesive strength is sufficiently lowered even at a low voltage.
  • the ionic conductivity can be measured by an AC impedance method using, for example, a Solartron 1260 frequency response analyzer.
  • the content (blended amount) of the ionic liquid in the adhesive composition of the present embodiment is preferably 0.5 parts by mass or more with respect to 100 parts by mass of the polymer from the viewpoint of reducing the adhesive strength during voltage application. , 30 parts by mass or less is preferable from the viewpoint of increasing the initial adhesive strength. From the same viewpoint, it is more preferably 20 parts by mass or less, further preferably 15 parts by mass or less, particularly preferably 10 parts by mass or less, and most preferably 5 parts by mass or less. Further, it is more preferably 0.6 parts by mass or more, further preferably 0.8 parts by mass or more, particularly preferably 1.0 parts by mass or more, and 1.5 parts by mass or more. is most preferred.
  • the pressure-sensitive adhesive composition of the present embodiment contains one or two components other than the polymer and the ionic liquid (hereinafter sometimes referred to as "other components") within a range that does not impair the effects of the present invention. It can contain more than one species. Other components that may be contained in the pressure-sensitive adhesive composition of the present embodiment are described below.
  • the adhesive composition of this embodiment may contain an ionic additive.
  • An ionic solid for example, can be used as the ionic additive.
  • An ionic solid is an ionic substance that is solid at 25°C.
  • the ionic solid is not particularly limited, for example, among the ionic substances obtained by combining the anions and cations exemplified in the description of the ionic liquid described above, those that are solid can be used.
  • the content of the ionic solid is preferably 0.5 parts by mass or more and 10 parts by mass or less with respect to 100 parts by mass of the polymer.
  • the pressure-sensitive adhesive composition of the present embodiment may contain a cross-linking agent as necessary for the purpose of improving creep resistance and shear resistance by cross-linking the polymer.
  • cross-linking agents include isocyanate-based cross-linking agents, carbodiimide-based cross-linking agents, epoxy-based cross-linking agents, melamine-based cross-linking agents, peroxide-based cross-linking agents, urea-based cross-linking agents, metal alkoxide-based cross-linking agents, and metal chelate-based cross-linking agents.
  • cross-linking agents metal salt-based cross-linking agents, oxazoline-based cross-linking agents, aziridine-based cross-linking agents, and amine-based cross-linking agents.
  • isocyanate-based cross-linking agents include toluenediisocyanate and methylenebisphenylisocyanate.
  • epoxy-based cross-linking agents include N,N,N',N'-tetraglycidyl-m-xylenediamine, diglycidylaniline, 1,3-bis(N,N-diglycidylaminomethyl)cyclohexane and 1, 6-hexanediol diglycidyl ether and the like.
  • the content thereof is preferably 0.1 parts by mass or more and 50 parts by mass or less with respect to 100 parts by mass of the polymer.
  • a crosslinking agent can be used individually or in combination of 2 or more types.
  • the adhesive composition of this embodiment may contain polyethylene glycol as necessary for the purpose of assisting the movement of the ionic liquid when voltage is applied.
  • Polyethylene glycol having a number average molecular weight of 200-6000 can be used.
  • the content is preferably 0.1 parts by mass or more and 30 parts by mass or less with respect to 100 parts by mass of the polymer.
  • the pressure-sensitive adhesive composition of the present embodiment may contain a conductive filler as necessary for the purpose of imparting conductivity to the pressure-sensitive adhesive composition.
  • the conductive filler is not particularly limited, and general known or commonly used conductive fillers can be used. For example, graphite, carbon black, carbon fiber, metal powder such as silver and copper, etc. can be used. .
  • the content is preferably 0.1 parts by mass or more and 200 parts by mass or less with respect to 100 parts by mass of the polymer.
  • the adhesive composition of the present embodiment also includes fillers, plasticizers, antioxidants, antioxidants, pigments (dyes), flame retardants, solvents, surfactants (leveling agents), rust inhibitors, and adhesives.
  • Various additives such as imparting resins, corrosion inhibitors, and antistatic agents may be included.
  • the total content of these components is not particularly limited as long as the effects of the present invention are exhibited, but is preferably 0.01 parts by mass or more and 20 parts by mass or less, more preferably 10 parts by mass or less, relative to 100 parts by mass of the polymer. , more preferably 5 parts by mass or less.
  • fillers examples include silica, iron oxide, zinc oxide, aluminum oxide, titanium oxide, barium oxide, magnesium oxide, calcium carbonate, magnesium carbonate, zinc carbonate, pyroxene clay, kaolin clay, and calcined clay.
  • plasticizer known and commonly used plasticizers used in general resin compositions can be used.
  • oils such as paraffin oil and process oil, liquid polyisoprene, liquid polybutadiene, liquid ethylene-propylene rubber, Liquid rubber, tetrahydrophthalic acid, azelaic acid, benzoic acid, phthalic acid, trimellitic acid, pyromellitic acid, adipic acid, sebacic acid, fumaric acid, maleic acid, itaconic acid, citric acid and their derivatives, dioctyl phthalate ( DOP), dibutyl phthalate (DBP), dioctyl adipate, diisononyl adipate (DINA), isodecyl succinate, and the like can be used.
  • DOP dioctyl phthalate
  • DBP dibutyl phthalate
  • DINA diisononyl adipate
  • anti-aging agents include hindered phenol compounds, aliphatic and aromatic hindered amine compounds, and the like.
  • antioxidants include butylhydroxytoluene (BHT) and butylhydroxyanisole (BHA).
  • pigments include inorganic pigments such as titanium dioxide, zinc oxide, ultramarine blue, red iron oxide, lithopone, lead, cadmium, iron, cobalt, aluminum, hydrochlorides and sulfates, organic pigments such as azo pigments, and copper phthalocyanine pigments. are mentioned.
  • rust preventives include zinc phosphates, tannic acid derivatives, phosphate esters, basic sulfonates, and various rust preventive pigments.
  • Tackifiers include, for example, titanium coupling agents and zirconium coupling agents.
  • Antistatic agents generally include quaternary ammonium salts, or hydrophilic compounds such as polyglycolic acid and ethylene oxide derivatives.
  • tackifying resins include rosin-based tackifying resins, terpene-based tackifying resins, phenol-based tackifying resins, hydrocarbon-based tackifying resins, ketone-based tackifying resins, polyamide-based tackifying resins, and epoxy-based tackifying resins. Examples include imparting resins, elastomeric tackifying resins, and the like.
  • tackifying resin can be used individually or in combination of 2 or more types.
  • corrosion inhibitors include carbodiimide compounds, adsorption inhibitors, and chelate-forming metal deactivators. For example, those described in JP-A-2019-059908 can be used.
  • the current-carrying base material 5 is not particularly limited as long as it includes the base material 3 and the conductive layer 4 .
  • a conductive layer is formed on the surface of the base material 3, and the like, and the conductive layer is formed on the surface of the base material exemplified above by a method such as plating, chemical vapor deposition, or sputtering. It can be anything.
  • the electrically peelable pressure-sensitive adhesive sheet can be attached to a conductive material to form a bonded body.
  • conductive materials include adherends such as metal adherend surfaces.
  • Metal adherend surfaces include, for example, aluminum, copper, iron, magnesium, tin, gold, silver, and lead.
  • a surface made of a metal as a component can be mentioned, and a surface made of a metal containing aluminum is particularly preferable.
  • the adherend having a metal adherend surface includes, for example, sheets, parts, and plates made of a metal containing aluminum, copper, iron, magnesium, tin, gold, silver, lead, or the like as a main component.
  • the adherend other than the adherend having a metal adherend surface include, but are not particularly limited to, paper, cloth, fiber sheets such as nonwoven fabric, and various plastic films and sheets.
  • a known or commonly used manufacturing method can be used as the method for manufacturing the pressure-sensitive adhesive sheet of the present embodiment.
  • the electro-peelable pressure-sensitive adhesive layer in the pressure-sensitive adhesive sheet of the present embodiment is formed by applying a solution of the pressure-sensitive adhesive composition of the present embodiment dissolved in a solvent, if necessary, onto a release liner, followed by drying and/or curing. is mentioned.
  • Other pressure-sensitive adhesive layers include a method of coating a release liner with a solution of a pressure-sensitive adhesive composition containing no ionic liquid and additives, optionally dissolved in a solvent, and drying and/or curing the solution. be done.
  • the solvent and the release liner those mentioned above can be used.
  • a conventional coater eg, gravure roll coater, reverse roll coater, kiss roll coater, dip roll coater, bar coater, knife coater, spray roll coater, etc.
  • a conventional coater eg, gravure roll coater, reverse roll coater, kiss roll coater, dip roll coater, bar coater, knife coater, spray roll coater, etc.
  • an electro-peeling adhesive layer and other adhesive layers can be produced.
  • Peeling of the pressure-sensitive adhesive sheet of the present embodiment from the adherend preferably starts from the inclined portion, and when the pressure-sensitive adhesive sheet has a tab at the end of the inclined portion, the tab is pulled perpendicularly to the adherend surface. It is preferable to peel off by
  • the pressure-sensitive adhesive layer in the pressure-sensitive adhesive sheet of the present embodiment is an electro-peeling pressure-sensitive adhesive layer
  • a voltage is applied to the electro-peeling pressure-sensitive adhesive layer to generate a potential difference in the thickness direction of the electro-peeling pressure-sensitive adhesive layer, resulting in adhesion.
  • the pressure-sensitive adhesive sheet is an adherend having metal adherend surfaces on both sides
  • electricity is applied to the metal adherend surfaces on both sides, and voltage is applied to the electro-peelable pressure-sensitive adhesive layer to reduce the adhesive strength and peel it off. can do.
  • the electrically-peeling adhesive layer side of the adhesive sheet X2 is an adherend having a metal adherend surface
  • the conductive adherend and the conductive layer 4 are energized, and a voltage is applied to the electrically-peeling adhesive layer.
  • the adhesive force can be lowered and the film can be peeled off.
  • the pressure-sensitive adhesive sheet X3 it can be peeled off by energizing the conductive layers 4 on both sides and applying a voltage to the electrically-peeling pressure-sensitive adhesive layer.
  • the energization is preferably performed by connecting terminals to one end and the other end of the pressure-sensitive adhesive sheet so that a voltage is applied to the entire electro-peelable pressure-sensitive adhesive layer.
  • the adherend has a metal adherend surface
  • the one end and the other end may be part of the adherend having the metal adherend surface.
  • the voltage may be applied after water is added to the interface between the metal adhesion surface and the electrically peeling pressure-sensitive adhesive layer.
  • the applied voltage is preferably 1 V or higher, more preferably 3 V or higher, and even more preferably 6 V or higher. Also, it is preferably 100 V or less, more preferably 50 V or less, even more preferably 30 V or less, and particularly preferably 15 V or less.
  • the voltage application time is preferably 60 seconds or less, more preferably 40 seconds or less, even more preferably 20 seconds or less, and particularly preferably 10 seconds or less. In such a case, workability is excellent. Also, the shorter the application time, the better, but it is usually 1 second or longer.
  • the pressure-sensitive adhesive sheet according to the embodiment of the present invention is used for mobile terminals such as smartphones, mobile phones, laptop computers, video cameras, and digital cameras. Suitable for fixing to And the adhesive sheet according to the embodiment of the present invention is suitable for fixing applications (for example, ceramic capacitors, lithium ion batteries, etc.) in semiconductor manufacturing processes and inspections. Furthermore, the pressure-sensitive adhesive sheet according to the embodiment of the present invention is suitable for protective applications in metalworking processes (for example, stainless steel plates for railways, etc.).
  • Examples of rigid members to be bonded by the pressure-sensitive adhesive sheet according to the embodiment of the present invention include silicon substrates for semiconductor wafers, sapphire substrates for LEDs, SiC substrates and metal base substrates, TFT substrates for displays and Examples include color filter substrates and base substrates for organic EL panels.
  • Examples of fragile members to be bonded with double-sided adhesive sheets include semiconductor substrates such as compound semiconductor substrates, silicon substrates for MEMS devices, passive matrix substrates, surface cover glass for smartphones, and touch panel sensors attached to the cover glass.
  • OGS One Glass Solution
  • substrates organic substrates and organic-inorganic hybrid substrates containing silsesquioxane as a main component
  • flexible glass substrates for flexible displays and graphene sheets.
  • the joined body of the present embodiment is a joined body comprising the pressure-sensitive adhesive sheet, a first adherend, and a second adherend. That is, the joined body of the present embodiment is a joined body in which the first adherend and the second adherend are joined with the pressure-sensitive adhesive sheet described above.
  • FIG. 8 is a top view schematically showing one configuration example (embodiment) of a joined body in which the first adherend 15 and the second adherend 16 are joined with the adhesive sheet 100.
  • the pressure-sensitive adhesive sheet 100 has double-sided adhesiveness in order to join the first adherend 15 and the second adherend 16 .
  • the pressure-sensitive adhesive sheet 100 has a strip shape extending linearly.
  • the pressure-sensitive adhesive sheet 100 is sandwiched between the first adherend 15 and the second adherend 16, and the first adherend 15 and the second adherend 16 is attached. Specifically, the adhesive surface of the adhesive sheet 100 is adhered to the first adherend 15 and the second adherend 16, respectively.
  • the first adherend and the second adherend are separated from the outer edge of the portion joined by the inclined portion of the pressure-sensitive adhesive sheet. and the second adherend.
  • FIG. 8 it is preferable to start separating the first adherend and the second adherend from the outer edge portion 17 of the first adherend 15 .
  • the pressure-sensitive adhesive sheet 100 has a tab as shown in FIG. 1 or FIG. 9 which will be described later in the examples, the tab may be separated by pulling it in a direction perpendicular to the adherend surface.
  • the pressure-sensitive adhesive sheet has an inclined portion, when the separation is started from the outer edge of the portion joined by the inclined portion, the stress required for starting peeling of the pressure-sensitive adhesive sheet can be reduced, and the pressure-sensitive adhesive layer and the adherend are separated. There is an advantage that there is no need to apply a large stress to part of the interface to separate the adherend, and the adherend is not deformed.
  • the first adherend 15 and the second adherend 16 are adherends having metal adherend surfaces.
  • the adherend having a metal adherend surface include those made of metals containing aluminum, copper, iron, magnesium, tin, gold, silver, lead, etc. as main components. is preferred.
  • the pressure-sensitive adhesive layer in the pressure-sensitive adhesive sheet of the present embodiment is an electro-peeling pressure-sensitive adhesive layer
  • a voltage is applied to the electro-peeling pressure-sensitive adhesive layer to generate a potential difference in the thickness direction of the electro-peeling pressure-sensitive adhesive layer, resulting in adhesion. After reducing the force, it is preferred to initiate the separation of the first and second adherends from the outer edge.
  • an adherend (a first adherend and a second adherend) having metal adherend surfaces on both sides of the electro-peelable pressure-sensitive adhesive layer 1, which is an adhesive sheet.
  • the pressure-sensitive adhesive sheet X2 is joined by the pressure-sensitive adhesive sheet X2, comprising a first adherend having a metal adherend surface on the side of the electro-peelable pressure-sensitive adhesive layer 1, and a second adherend on the side of the pressure-sensitive adhesive layer 2
  • a bonded body, a bonded body bonded by the pressure-sensitive adhesive sheet X3 and having adherends (a first adherend and a second adherend) on both sides of the pressure-sensitive adhesive layer 2, and the like can be mentioned.
  • BA n-butyl acrylate
  • MEA 2-methoxyethyl acrylate
  • ethyl acetate as a polymerization solvent 150 parts by mass.
  • AIBN 2,2′-azobisisobutyronitrile
  • Example 1 Preparation of electro-peelable pressure-sensitive adhesive layer 100 parts by mass of the acrylic polymer (solution) obtained above, 0.4 parts by mass of the cross-linking agent V-05, 4 parts by mass of the ionic liquid AS-110, additives (3 parts by mass of the adsorption inhibitor AMINE O and Irgacor 0.3 parts by mass of DSSG, 0.8 parts by mass of chelate-forming metal deactivator Irgamet 30), and ethyl acetate are added, stirred and mixed to prepare an electropeeling adhesive composition having a solid content concentration of 25% by mass. A product (solution) was obtained.
  • the resulting electro-peeling adhesive composition (solution) was applied onto the release-treated surface of a release-treated polyethylene terephthalate release liner (trade name: "MRF38", manufactured by Mitsubishi Plastics, Inc.) using an applicator. It was applied to a uniform thickness. Next, heat drying is performed at 150° C. for 3 minutes, and the release-treated surface of the release-treated polyethylene terephthalate release liner (trade name “MRE38”, manufactured by Mitsubishi Plastics Co., Ltd.) is placed on the adhesive using a hand roller. to obtain an electro-peelable pressure-sensitive adhesive layer having a thickness of 50 ⁇ m.
  • ionic liquids cross-linking agents, adsorption-type inhibitors, and chelate-forming metal deactivators are as follows.
  • (ionic liquid) AS-110 cation: 1-ethyl-3-methylimidazolium cation, anion: bis (fluorosulfonyl) imide anion, trade name "ELEXCEL AS-110", Daiichi Kogyo Seiyaku Co., Ltd.
  • (crosslinking agent) V-05 Polycarbodiimide resin, trade name "Carbodilite V-05", manufactured by Nisshinbo Chemical Co., Ltd.
  • Irgacor DSSG sodium sebacate, trade name "Irgacor DSSG", manufactured by BASF Japan Ltd.
  • Irgamet 30 N,N-bis(2-ethylhexyl)-[(1,2,4-triazol-1-yl)methyl]amine, trade name "Irgamet 30" manufactured by BASF Japan Ltd.
  • the polyethylene terephthalate release liner (MRE38) of the obtained electro-peeling pressure-sensitive adhesive layer was peeled off, and a conductive layer (metal layer (aluminum deposition layer)) and a base material (polyethylene A film with a metal layer (trade name “Metal Me TS”, manufactured by Toray Advanced Film Co., Ltd., thickness 50 ⁇ m), which is a laminate in which terephthalate (PET)) is laminated in this order, is laminated on the conductive layer side surface and laminated.
  • Body 1 Furthermore, a double-sided tape (trade name “No.
  • the laminate 2 was cut into a size of 20 (W) mm in width, 90 mm in total length (L), and 30 mm in tab length (L3). is 5 mm, the slope length L2 is 30 mm, the total length L is 90 mm, the tab width is 10 mm, and the tab length L3 is 30 mm. sheet).
  • the release liner on the side of the other adhesive layer was peeled off, and an acrylic plate (40 mm ⁇ 100 mm, thickness 3 mm) was attached as the first adherend 15 to the peeled surface, pressed at 5 kg for 10 seconds, and heated at 23 ° C. After being left in the environment for 30 minutes, a joined body composed of SUS304BA plate/electro-peeling adhesive layer (adhesive sheet)/acrylic plate as shown in FIG. 9 was obtained.
  • Adhesion test An adhesive force test was conducted using the joined body produced by the above method as a test sample. Using a peel tester (trade name "Small desktop tester EZ-SX", manufactured by Shimadzu Corporation), the tab part of the adhesive sheet is pulled vertically while holding down the SUS304BA plate in the joined body, and the adhesive strength (tab side) is measured. It was measured (tensile speed: 150 mm/min, peeling temperature: 23°C). In addition, for the manufactured joined body, the end of the pressure-sensitive adhesive sheet on the side opposite to the tab side was pulled in the vertical direction while holding down the SUS304BA plate in the joined body, and the adhesive strength (opposite side) was measured (pulling speed: 150 mm / min, peel temperature 23°C). Also, the ratio of the adhesive strength (tab side) to the adhesive strength (opposite side) was calculated.
  • Electropeel strength test An electrical peel strength test was performed using the joined body produced by the above method as a test sample. Before peeling, a negative electrode was attached to the SUS304BA plate of the joined body, and a positive electrode was attached to the aluminum vapor-deposited surface of the film with a metal layer, and a voltage of 50 V was applied for 10 seconds. Electropeel forces (tab side and opposite side) were measured in the same manner as in the above adhesion test, and the ratio of the peel force (tab side) to the peel force (opposite side) was calculated.
  • Shear adhesive strength test A shear adhesive strength test was performed using the joined body produced by the above method as a test sample. The tensile shear adhesive strength between the SUS304BA plate and the acrylic plate in the joint structure was measured with a tensile tester (manufactured by Minebea, model number: TG-100 kN). The measurement was carried out at 25° C. and a tensile speed of 5 mm/min. The obtained measured value was converted into the shear adhesive strength per unit area.
  • Examples 2 to 12 A pressure-sensitive adhesive sheet and a bonded body were produced in the same manner as in Example 1, except that the shape of the pressure-sensitive adhesive sheet was changed as shown in Tables 1 and 2.
  • the size of the stainless steel plate was changed to 60 mm ⁇ 200 mm, and the size of the acrylic plate was changed to 40 mm ⁇ 180 mm.
  • Example 1 A pressure-sensitive adhesive sheet and a bonded body were produced in the same manner as in Example 1, except that the shape of the pressure-sensitive adhesive sheet was changed to a belt shape having a width of 20 mm, a length of 90 mm and a tab width of 20 mm without providing an inclined portion.
  • Example 2 A pressure-sensitive adhesive sheet and a joined body were produced in the same manner as in Example 1, except that the shape of the pressure-sensitive adhesive sheet was changed to a strip shape having a width of 40 mm, a length of 90 mm and a tab width of 40 mm without providing an inclined portion.
  • the present invention provides a pressure-sensitive adhesive sheet and a joined body having excellent adhesive strength and good releasability. Further, the present invention provides a method for separating a joined body with good peelability.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Adhesive Tapes (AREA)

Abstract

La présente invention concerne une feuille adhésive ayant une forme de bande et pourvue d'une couche adhésive, ladite feuille adhésive comprenant une partie inclinée formée selon une forme effilée de telle sorte que sa largeur se rétrécit vers une extrémité de la feuille adhésive dans la direction longitudinale.
PCT/JP2022/012878 2021-03-30 2022-03-18 Feuille adhésive, corps lié et procédé de séparation de corps lié WO2022210055A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2023510994A JPWO2022210055A1 (fr) 2021-03-30 2022-03-18

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2021057809 2021-03-30
JP2021-057809 2021-03-30

Publications (1)

Publication Number Publication Date
WO2022210055A1 true WO2022210055A1 (fr) 2022-10-06

Family

ID=83456036

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2022/012878 WO2022210055A1 (fr) 2021-03-30 2022-03-18 Feuille adhésive, corps lié et procédé de séparation de corps lié

Country Status (2)

Country Link
JP (1) JPWO2022210055A1 (fr)
WO (1) WO2022210055A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006509903A (ja) * 2002-12-16 2006-03-23 ザイロン、インコーポレイテッド マスター加工作業を行うデバイスおよび方法
JP2013540457A (ja) * 2010-08-04 2013-11-07 スリーエム イノベイティブ プロパティズ カンパニー 露出したプルタブを備えた接着取り付けされる物品支持アセンブリ
US20150218425A1 (en) * 2014-02-05 2015-08-06 Apple Inc. Stretch release conductive adhesive
JP2015160906A (ja) * 2014-02-27 2015-09-07 日東電工株式会社 積層体
JP2017075231A (ja) * 2015-10-14 2017-04-20 日東電工株式会社 タブ付き粘着製品
JP3220121U (ja) * 2018-12-03 2019-02-14 後藤　秀樹 結束テープ
JP2021028388A (ja) * 2019-08-09 2021-02-25 日東電工株式会社 電気剥離型粘着シート、接合体、および接合体の分離方法

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006509903A (ja) * 2002-12-16 2006-03-23 ザイロン、インコーポレイテッド マスター加工作業を行うデバイスおよび方法
JP2013540457A (ja) * 2010-08-04 2013-11-07 スリーエム イノベイティブ プロパティズ カンパニー 露出したプルタブを備えた接着取り付けされる物品支持アセンブリ
US20150218425A1 (en) * 2014-02-05 2015-08-06 Apple Inc. Stretch release conductive adhesive
JP2015160906A (ja) * 2014-02-27 2015-09-07 日東電工株式会社 積層体
JP2017075231A (ja) * 2015-10-14 2017-04-20 日東電工株式会社 タブ付き粘着製品
JP3220121U (ja) * 2018-12-03 2019-02-14 後藤　秀樹 結束テープ
JP2021028388A (ja) * 2019-08-09 2021-02-25 日東電工株式会社 電気剥離型粘着シート、接合体、および接合体の分離方法

Also Published As

Publication number Publication date
JPWO2022210055A1 (fr) 2022-10-06

Similar Documents

Publication Publication Date Title
JP7284226B2 (ja) 電気剥離用粘着剤組成物、粘着シート、及び接合体
JP7136567B2 (ja) 電気剥離用粘着剤組成物、粘着シート、及び接合体
CN112639045B (zh) 粘合剂组合物、粘合片和接合体
WO2021177197A1 (fr) Composition adhésive, feuille adhésive et corps lié
WO2020067221A1 (fr) Procédé de séparation de partie à coller et procédé d'assemblage
TWI819084B (zh) 黏著劑組合物、黏著片、及接合體
WO2021200054A1 (fr) Composition adhésive sensible à la pression, feuille adhésive sensible à la pression et objet lié
WO2022210055A1 (fr) Feuille adhésive, corps lié et procédé de séparation de corps lié
WO2020067222A1 (fr) Procédé de jonction et de séparation pour parties adhérées
WO2022163593A1 (fr) Composition adhésive pour peeling électrique, feuille adhésive et corps lié
WO2023054478A1 (fr) Composition adhésive, feuille adhésive et corps assemblé
WO2022030565A1 (fr) Feuille adhésive électriquement pelable et corps lié
WO2023054484A1 (fr) Composition adhésive, feuille adhésive et corps lié
WO2023054480A1 (fr) Composition adhésive, feuille adhésive et corps lié

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 22780270

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 2023510994

Country of ref document: JP

Kind code of ref document: A

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 22780270

Country of ref document: EP

Kind code of ref document: A1