WO2022163233A1 - 離型フィルム付き粘着シート、離型フィルム付き画像表示装置用積層体および画像表示装置用積層体の製造方法 - Google Patents

離型フィルム付き粘着シート、離型フィルム付き画像表示装置用積層体および画像表示装置用積層体の製造方法 Download PDF

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Publication number
WO2022163233A1
WO2022163233A1 PCT/JP2021/047567 JP2021047567W WO2022163233A1 WO 2022163233 A1 WO2022163233 A1 WO 2022163233A1 JP 2021047567 W JP2021047567 W JP 2021047567W WO 2022163233 A1 WO2022163233 A1 WO 2022163233A1
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WO
WIPO (PCT)
Prior art keywords
adhesive sheet
release film
pressure
image display
sensitive adhesive
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Application number
PCT/JP2021/047567
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English (en)
French (fr)
Japanese (ja)
Inventor
博信 多田
晋也 福田
Original Assignee
三菱ケミカル株式会社
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Filing date
Publication date
Application filed by 三菱ケミカル株式会社 filed Critical 三菱ケミカル株式会社
Priority to JP2022578162A priority Critical patent/JPWO2022163233A1/ja
Priority to CN202180090744.5A priority patent/CN116829666A/zh
Priority to KR1020237024269A priority patent/KR20230133297A/ko
Publication of WO2022163233A1 publication Critical patent/WO2022163233A1/ja

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    • 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]
    • C09J7/381—Pressure-sensitive adhesives [PSA] based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
    • C09J7/385—Acrylic polymers
    • 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
    • C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
    • 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
    • C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
    • C09J133/04—Homopolymers or copolymers of esters
    • 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
    • C09J4/00—Adhesives based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; adhesives, based on monomers of macromolecular compounds of groups C09J183/00 - C09J183/16
    • C09J4/06—Organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond in combination with a macromolecular compound other than an unsaturated polymer of groups C09J159/00 - C09J187/00
    • 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
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/40—Adhesives in the form of films or foils characterised by release liners
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • 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
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • 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
    • C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
    • C09J2203/318—Applications of adhesives in processes or use of adhesives in the form of films or foils for the production of liquid crystal displays
    • 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
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/20—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive itself
    • C09J2301/208—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive itself the adhesive layer being constituted by at least two or more adjacent or superposed adhesive layers, e.g. multilayer adhesive
    • 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
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
    • C09J2301/312—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier parameters being the characterizing feature
    • 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
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/40—Additional features of adhesives in the form of films or foils characterized by the presence of essential components
    • C09J2301/416—Additional features of adhesives in the form of films or foils characterized by the presence of essential components use of irradiation
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2202/00—Materials and properties
    • G02F2202/28—Adhesive materials or arrangements

Definitions

  • the present invention relates to a pressure-sensitive adhesive sheet with a release film, a laminate for an image display device with a release film, and a method for producing a laminate for an image display device.
  • an image display panel such as a liquid crystal display (LCD), a plasma display (PDP) or an electroluminescence display (ELD), and a protective panel arranged on the front side (visible side),
  • LCD liquid crystal display
  • PDP plasma display
  • ELD electroluminescence display
  • a gap between the touch panel member and the touch panel member is filled with a resin such as an adhesive or an adhesive to suppress reflection of incident light or emitted light from a display image at the interface of the air layer.
  • Patent Document 1 as a method for producing a structural laminate for an image display device having a structure in which a constituent member for an image display device is laminated on at least one side of a transparent double-sided pressure-sensitive adhesive sheet, primary cross-linking is performed with ultraviolet rays.
  • a method is disclosed in which, after bonding an adhesive sheet to a constituent member for an image display device, the adhesive sheet is irradiated with ultraviolet rays through the constituent member for an image display device for secondary curing.
  • Patent Document 2 discloses a pressure-sensitive adhesive sheet containing a (meth)acrylic copolymer having an ultraviolet crosslinkable site as an adhesive sheet useful for displays and touch panels.
  • Patent Documents 1 and 2 were examined for a laminated structure using conventional flat image display device constituent members, and the reliability of bonding to a curved surface member having a curved shape was not considered. I didn't.
  • the release film since the release film, the adhesive sheet, and the image display device constituent members are laminated and stored for a long period of time, when the image display device constituent member has a curved shape, the release film is It was easy to lift from the adhesive sheet, and improvement was required.
  • the problem to be solved by the present invention is to provide a pressure-sensitive adhesive sheet with a release film, which is excellent in storage stability and bonding reliability, and which is used for bonding two constituent members of an image display device.
  • the present inventors solved the above problems by setting the peeling force of the release film to the pressure-sensitive adhesive sheet in a specific range in the pressure-sensitive adhesive sheet used in the laminate for image display device. I found what I can do.
  • a pressure-sensitive adhesive sheet with a release film used for bonding two components constituting an image display device at least one of the image display device constituent members is an image display device constituent member having a curved shape;
  • the pressure-sensitive adhesive sheet is a pressure-sensitive adhesive sheet formed from a resin composition containing a (meth)acrylic copolymer (A),
  • the release film has a 180° peeling force of 0.06 to 0.20 N/cm at a tensile speed of 300 mm/min with respect to the adhesive sheet.
  • Adhesive sheet with release film Adhesive sheet with release film.
  • B cross-linking agent
  • C photopolymerization initiator
  • the pressure-sensitive adhesive sheet is a pressure-sensitive adhesive sheet having a multilayer structure of at least three layers, and the ratio of the total thickness of the outermost layer and the outermost layer of the pressure-sensitive adhesive sheet to the thickness of the entire pressure-sensitive adhesive sheet is 5 to 70.
  • B cross-linking agent
  • a method for producing a laminate for constituting an image display device having a configuration in which an image display device constituent member having a curved shape is laminated with another image display device constituent member via an adhesive sheet comprising: A method for producing a laminate for an image display device, comprising steps 1 to 4 in this order.
  • Step 1 A step of preparing an image display device component having a curved shape and an adhesive sheet with a double-sided release film.
  • Step 2 A step of peeling off one of the release films of the pressure-sensitive adhesive sheet with a double-sided release film, and laminating the image display device constituent member having a curved shape to obtain a laminate with a release film for an image display device.
  • Step 3 A step of peeling the release film from the laminate for an image display device with the release film and bonding it to another constituent member of the image display device.
  • Step 4 A step of irradiating an active energy ray through an image display device component having a curved shape and/or other image display device component to obtain a laminate for image display device.
  • the adhesive sheet with a double-sided release film includes a heavy release side release film and a light release side release film as release films, and the heavy release side release film is pulled against the adhesive sheet at a speed of 300 mm /
  • [15] The method for producing a laminate for image display device according to [13] or [14], wherein the pressure-sensitive adhesive sheet is a (meth)acrylic pressure-sensitive adhesive sheet having a multilayer structure of at least two layers.
  • the release film can be released during storage.
  • the film does not lift off from the pressure-sensitive adhesive sheet, is excellent in storage stability, and is excellent in lamination reliability during use.
  • (meth)acryl means acrylic or methacrylic
  • (meth)acryloyl means acryloyl or methacryloyl
  • (meth)acrylate means acrylate or methacrylate, respectively.
  • sheet is not particularly distinguished from “film” and “tape”, but is used to include these.
  • y and/or z (y and z are arbitrary constituents or components)" means three combinations of y only, z only, and y and z.
  • the pressure-sensitive adhesive sheet with a release film of the present invention is usually used for bonding two components of an image display device. Used as a repair material.
  • the pressure-sensitive adhesive sheet with a release film is usually formed by laminating a release film and a pressure-sensitive adhesive sheet.
  • a pressure-sensitive adhesive sheet with a double-sided release film is preferable.
  • one release film and the other release film usually have different adhesive strengths to the adhesive sheet. Release film) is peeled off, and later the release film with higher adhesive strength (heavy release side release film) is peeled off and used.
  • at least one of the image display device constituent members to be bonded is an image display device constituent member having a curved shape.
  • the other release film and the pressure-sensitive adhesive sheet have a curved shape. Since they are laminated along the image display constituent member, the release film and adhesive sheet are also usually curved.
  • Each member constituting the pressure-sensitive adhesive sheet with a release film and the laminate for an image display device with a release film will be described below.
  • the release film used in the present invention has a 180° peeling force of 0.06 to 0.20 N/cm, preferably 0.07 to 0.19 N/cm against the pressure-sensitive adhesive sheet at a tensile speed of 300 mm/min. Particularly preferably, it is 0.08 to 0.18 N/cm. Since the release film used in the present invention has a relatively high peeling force, it has excellent adhesion to a curved adhesive sheet, does not lift off from the adhesive sheet during storage, and has excellent storage stability.
  • the pressure-sensitive adhesive sheet with a release film of the present invention is a pressure-sensitive adhesive sheet with a double-sided release film comprising a heavy release side release film and a light release side release film
  • the heavy release side release film has the above peel strength
  • the other release film on the light release side is preferably a release film having a lower release force than the release film on the heavy release side.
  • the 180° peel force at a tensile speed of 300 mm/min for the adhesive sheet is measured by the following method. First, a release film and a pressure-sensitive adhesive sheet to be described later are laminated to prepare a pressure-sensitive adhesive sheet with a single-sided release film. Next, the adhesive surface of this adhesive sheet with a release film is attached to a soda-lime glass by reciprocating a hand roller once to obtain a sample. For this sample, the peeling force (N/cm) when the release film was peeled off from the adhesive sheet under the conditions of a temperature of 23 ° C. and a humidity of 50% RH, a peeling angle of 180 °, and a peeling speed of 300 mm / min. to measure.
  • the thickness of the release film is preferably 20-500 ⁇ m, more preferably 30-250 ⁇ m, even more preferably 40-125 ⁇ m, and particularly preferably 60-100 ⁇ m.
  • the flexural rigidity (MPa ⁇ m 4 ) of the release film is preferably 10 to 50 MPa ⁇ m 4 , more preferably 13 to 45 MPa ⁇ m 4 , and 15 to 40 MPa ⁇ m 4 . is particularly preferred.
  • the flexural rigidity (MPa ⁇ m 4 ) of the release film is measured by the following method.
  • a strip having a width of 4 mm and a length of 37 mm is cut from the release film so that the longitudinal side is TD (perpendicular direction) to obtain a sample.
  • This sample was measured using a dynamic viscoelasticity measuring device (DVA-200, manufactured by IT Instrument Control Co., Ltd.) under the conditions of tensile mode, frequency of 1 Hz, measurement temperature of 0 to 80 ° C., and temperature increase rate of 3 ° C.
  • a viscoelasticity measurement is performed to determine the elastic modulus (G') at 25°C. From the obtained elastic modulus (G'), the bending stiffness per unit length is obtained by the following formula (1).
  • Examples of materials for the release film include films made of material resins such as polyester resins, polyolefin resins, polycarbonate resins, polystyrene resins, acrylic resins, triacetylcellulose resins, and fluorine resins.
  • these films coated with a silicone resin for release treatment, release paper, and the like can also be appropriately selected and used.
  • polyester resins and polyolefin resins are preferred, release-treated polyester resins and polyolefin resins are more preferred, and release-treated polyethylene terephthalate is particularly preferred.
  • the material resin of the release film may be used alone or in combination of two or more.
  • the film made of the above resin is subjected to release treatment using a silicone composition containing solvent-curable silicone, non-solvent-curable silicone, or the like, or a reactive polymer is used.
  • the release force can be adjusted by including a release modifier or the like.
  • the reactive heavy release modifier is a type of heavy release modifier that reacts with the siloxane polymer of the release agent during drying and is incorporated therein.
  • a resin having a vinyl group as is generally called MQ resin or MDQ resin is preferred.
  • the area of the release film is preferably larger than the area of the pressure-sensitive adhesive sheet, and more preferably larger than the area of the constituent members of the image display device, from the standpoint of releasability during use.
  • the shape of the release film may be one that is one size larger along the entire circumference of the adhesive sheet, or may be a shape that protrudes from a part of the circumference of the adhesive sheet.
  • the distance from the periphery of the pressure-sensitive adhesive sheet to the tip of the part where the release film protrudes is preferably 0.5 to 20 mm, more preferably 1 to 10 mm, and particularly preferably 2 to 8 mm. .
  • the pressure-sensitive adhesive sheet used in the present invention is a pressure-sensitive adhesive sheet containing a (meth)acrylic copolymer (A), preferably formed from a resin composition containing the (meth)acrylic copolymer (A) as a main component. Yes, it may be a single layer or a multi-layer structure.
  • the "main component” refers to the (meth)acrylic copolymer (A) of 50% by mass or more, preferably 70% by mass or more, more preferably 80% by mass or more, based on the entire resin composition. means to contain
  • the layer structure of the pressure-sensitive adhesive sheet may be a single layer or a multilayer structure, but is preferably a multilayer structure of two or more layers from the viewpoint of lamination reliability, and more preferably a surface layer and a back layer.
  • the outermost layer and the outermost layer are the (meth)acrylic pressure-sensitive adhesive layers, and furthermore, three layers having an intermediate layer formed from a resin composition containing a (meth)acrylic copolymer [outermost layer (adhesive layer)/intermediate layer/backmost layer (adhesive layer)].
  • the intermediate layer is also preferably formed from the resin composition.
  • Each layer of the pressure-sensitive adhesive sheet may be laminated with layers formed from the same resin composition, or may be laminated with layers formed from different resin compositions. Moreover, when the pressure-sensitive adhesive sheet has a multi-layer structure of three or more layers, the outermost layer and the outermost layer are preferably layers formed from the same resin composition.
  • the thickness of the adhesive sheet is preferably 50-1000 ⁇ m, more preferably 60-500 ⁇ m, and particularly preferably 75-300 ⁇ m. If the thickness of the sheet is too thin, the step absorbability tends to decrease, and if the sheet is too thick, it tends to be difficult to obtain bonding reliability to a curved surface member having a curved portion.
  • the ratio of the total thickness of the outermost layer and the outermost layer to the total thickness is preferably 5 to 70%, more preferably. 10 to 60%, particularly preferably 20 to 45%.
  • the Asker hardness of the adhesive sheet is preferably 30 or higher, more preferably 35 or higher, more preferably 40 or higher, and particularly preferably 45 or higher.
  • the upper limit is usually 100 or less, preferably 80 or less.
  • the image display device Stress may be applied locally to the structural laminate, and the pressure-sensitive adhesive sheet may be dented, impairing the appearance and visibility of the image display device.
  • the Asker hardness is equal to or higher than the above value, the laminate for image display device tends to be excellent in resistance to dents.
  • the Asker hardness is determined by stacking adhesive sheets so that the total thickness of the adhesive sheet is in the range of 5 to 7 mm, and applying a load from a height of 10 mm to the adhesive surface of the adhesive sheet with the tip terminal of an Asker C2L hardness tester. It is measured by pressing 1 kg vertically downward at a rate of 3 mm/min.
  • the Asker hardness of the adhesive sheet is the numerical value when the adhesive sheet is laminated so that the total thickness of the adhesive sheet is in the range of 5 to 7 mm. This is because, in order to accurately measure the Asker hardness of the pressure-sensitive adhesive sheet, it is necessary to avoid fluctuations in the measurement results due to the influence of the measuring stage due to insufficient thickness of the pressure-sensitive adhesive sheet. Therefore, when measuring the Asker hardness, it is necessary to measure the pressure-sensitive adhesive sheet after adjusting it to a certain thickness range. By measuring the Asker hardness after preliminarily adjusting the pressure-sensitive adhesive sheet within the above range, the Asker hardness of the pressure-sensitive adhesive sheet can be accurately determined.
  • the pressure-sensitive adhesive sheet preferably has a photo-curing property that is cured by irradiation with active energy rays such as ultraviolet rays.
  • the gel fraction before curing is preferably 10% or more, more preferably 40% or more, and still more preferably 60%. above, and particularly preferably above 65%.
  • the gel fraction is 10% or more, the pressure-sensitive adhesive sheet does not cause cohesive failure over time when bonded to a curved surface member, and tends to exhibit excellent curved surface bonding properties.
  • the gel fraction is preferably 90% or less, more preferably 80% or less.
  • the adhesive sheet has active energy ray curability, and when cured by irradiating an active energy ray with a wavelength of 365 nm at an integrated light amount of 2000 to 3000 mJ/cm 2 , the gel fraction increases compared to before curing. is preferred.
  • the gel fraction after curing is preferably 70% or more, more preferably 73% or more, and particularly preferably 75% or more.
  • the upper limit is usually 100%.
  • the gel fraction after curing is preferably increased by 2% or more, more preferably by 3% or more, and more preferably by 5% or more as a difference in gel fraction compared to before curing. more preferably, and particularly preferably an increase of 10% or more.
  • the difference between the gel fractions before and after curing is within the above range, there is a tendency that it is possible to impart step followability and durability when used as an image display device.
  • the gel fraction is obtained by the following method.
  • the pressure-sensitive adhesive sheet is weighed (mass before immersion), wrapped in a SUS mesh (#200) bag, immersed in ethyl acetate, and stored in the dark at 23° C. for 24 hours. After that, take out the package, heat at a temperature of 70 ° C. for 4.5 hours to evaporate the adhering ethyl acetate, measure the mass of the remaining adhesive sheet (mass after immersion), and calculate the gel fraction from the following formula.
  • Ask. Gel fraction (%) [(mass after immersion) / (mass before immersion)] x 100
  • the adhesive strength of the adhesive sheet is usually 3 N/cm or more, preferably 4 N/cm or more, and particularly preferably 5 N/cm or more.
  • the upper limit of the 180° peel adhesive strength is usually 50 N/cm.
  • the adhesive strength after irradiation with active energy rays (after curing) is usually 3 N/cm or more, preferably 4 N/cm or more, and particularly preferably 5 N/cm. cm or more. Also, the upper limit of the 180° peel adhesive strength is usually 50 N/cm.
  • the adhesive strength is measured by the following method.
  • a polyethylene terephthalate film (Mitsubishi Chemical Co., Ltd., Diafoil T100) having a thickness of 100 ⁇ m is bonded to one surface of the adhesive sheet, and the other surface is roll-pressed to soda-lime glass to obtain a bonded product.
  • the above-mentioned laminated product is cured at a temperature of 40° C. for 3 hours and then finished and laminated to obtain a sample.
  • the peeling force (N/cm) against glass is measured when the sample is peeled off at a peeling angle of 180° and a peeling speed of 60 mm/min under an environment of a temperature of 23° C. and a humidity of 50% RH.
  • the adhesive strength after curing was evaluated by irradiating the above-mentioned finish pasted sample from the polyethylene terephthalate film surface with ultraviolet rays at a temperature of 23° C. and a humidity of 50% RH after irradiating ultraviolet rays at 365 nm so that the integrated light amount was 2000 mJ/cm 2 .
  • the pressure-sensitive adhesive sheet is preferably an optically transparent transparent pressure-sensitive adhesive sheet.
  • optically transparent means that the total light transmittance is 80% or more, preferably 85% or more, more preferably 90% or more.
  • the haze value of the adhesive sheet is preferably 10% or less, more preferably 5% or less, and particularly preferably 3% or less.
  • the pressure-sensitive adhesive sheet is formed from the resin composition containing the (meth)acrylic copolymer (A) as described above. Each component contained in the resin composition will be described below.
  • Examples of the (meth)acrylic copolymer (A) include a copolymer of an alkyl (meth)acrylate monomer having an alkyl group having 4 to 18 carbon atoms and a monomer component copolymerizable therewith. be done.
  • the (meth)acrylic copolymer (A) may be contained in the resin composition alone, or may be contained in two or more.
  • alkyl (meth)acrylate monomers having 4 to 18 carbon atoms in the alkyl group examples include n-butyl (meth)acrylate, pentyl (meth)acrylate, hexyl (meth)acrylate, heptyl (meth)acrylate, n- Octyl (meth)acrylate, nonyl (meth)acrylate, decyl (meth)acrylate, undecyl (meth)acrylate, lauryl (meth)acrylate, tridecyl (meth)acrylate, tetradecyl (meth)acrylate, cetyl (meth)acrylate, stearyl ( Linear alkyl (meth)acrylates such as meth)acrylate, isobutyl (meth)acrylate, sec-butyl (meth)acrylate, t-butyl (meth)acrylate, isopentyl (meth)acrylate, neopentyl (meth)acrylate, 2-
  • alicyclic (meth)acrylates These may be used singly or in combination of two or more. Among them, branched alkyl (meth)acrylates and alicyclic (meth)acrylates having 6 to 14 carbon atoms in the alkyl group are preferable, and 2-ethylhexyl (meth)acrylate and isobornyl (meth)acrylate are more preferable. .
  • the content of the alkyl (meth)acrylate having 4 to 18 carbon atoms in the alkyl group is usually 30 to 90% by mass, preferably 35 to 88% by mass, more preferably 35 to 88% by mass, in the total monomer components of the copolymer. is 40 to 85% by weight, particularly preferably 55 to 85% by weight.
  • Examples of the copolymerizable monomer component include a carboxy group-containing monomer, a hydroxyl group-containing monomer, a nitrogen atom-containing monomer, an epoxy group-containing monomer, a vinyl monomer, and an alkyl (meth)acrylate monomer having an alkyl group having 1 to 3 carbon atoms. and copolymers with monomer components containing any one or more monomers selected from other copolymerizable monomers.
  • the (meth)acrylic copolymer (A) contained in the resin composition forming the surface layer and the back layer (the outermost layer and the innermost layer in the case of three or more layers) of the pressure-sensitive adhesive sheet has an alkyl group.
  • monomer components copolymerizable with alkyl (meth)acrylate monomers having 4 to 18 carbon atoms, carboxy group-containing monomers, hydroxyl group-containing monomers, vinyl monomers, and alkyl (meth)acrylates having 1 to 3 carbon atoms in the alkyl group It is preferably a (meth)acrylic copolymer (A1) obtained by copolymerizing a monomer component containing at least one selected from the group consisting of monomers.
  • the (meth)acrylic copolymer (A) contained in the resin composition forming the intermediate layer when the pressure-sensitive adhesive sheet has three or more layers is an alkyl (meth)
  • a monomer component copolymerizable with an acrylate monomer is selected from the group consisting of a carboxy group-containing monomer, a hydroxyl group-containing monomer, a nitrogen atom-containing monomer, a vinyl monomer, and an alkyl (meth)acrylate monomer having an alkyl group having 1 to 3 carbon atoms.
  • A2 is preferably a (meth)acrylic copolymer (A2) obtained by copolymerizing a monomer component containing at least one of More preferably, it contains at least one selected from the group consisting of 1 to 3 alkyl (meth)acrylate monomers.
  • carboxy group-containing monomer examples include (meth)acrylic acid, (meth)acrylic acid dimer, and the like. These may be used singly or in combination of two or more. Among them, (meth)acrylic acid is preferred.
  • the content of the carboxy group-containing monomer is usually 10% by mass or less, preferably 8% by mass or less, and particularly preferably 6% by mass or less in the total monomer components of the copolymer. In addition, a lower limit is 0 mass % normally.
  • hydroxyl group-containing monomer examples include 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 2-hydroxy-1-methylethyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, 2 - hydroxybutyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, glycerin mono(meth)acrylate, polyethylene glycol mono(meth)acrylate, polypropylene glycol mono(meth)acrylate, polyethylene glycol polypropylene glycol mono(meth)acrylate, polyethylene glycol polybutylene glycol mono(meth)acrylate, polypropylene glycol polybutylene glycol mono(meth)acrylate, hydroxyphenyl(meth)acrylate and the like. These may be used singly or in combination of two or more. Among them, 2-hydroxyethyl (meth)acrylate and 4-hydroxybutyl (meth)acrylate are preferred.
  • the content of the hydroxyl group-containing monomer is usually 30% by mass or less, preferably 25% by mass or less, and particularly preferably 20% by mass or less in the total monomer components of the copolymer.
  • a lower limit is 0 mass % normally.
  • nitrogen atom-containing monomer examples include aminoalkyl (meth)acrylates such as aminomethyl (meth)acrylate, aminoethyl (meth)acrylate, aminopropyl (meth)acrylate, aminoisopropyl (meth)acrylate, N-alkylamino Amino group-containing monomers such as alkyl (meth)acrylates, N,N-dimethylaminoethyl (meth)acrylate, N,N-dimethylaminopropyl (meth)acrylate, (meth)acrylamide, N,N-dimethyl (meth)acrylamide , N-butyl (meth)acrylamide, N-methylol (meth)acrylamide, N-methylolpropane (meth)acrylamide, N-methoxymethyl (meth)acrylamide, N-butoxymethyl (meth)acrylamide, diacetone (meth)acrylamide and amide group-containing monomers such as maleic acid amide and maleimide. These may be used
  • the content of the nitrogen atom-containing monomer is usually 20% by mass or less, preferably 10% by mass or less, and particularly preferably 7% by mass or less in the total monomer components of the copolymer.
  • a lower limit is 0 mass % normally.
  • epoxy group-containing monomer examples include glycidyl (meth)acrylate, methylglycidyl (meth)acrylate, 3,4-epoxycyclohexylmethyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate glycidyl ether, and the like. These may be used singly or in combination of two or more.
  • the content of the epoxy group-containing monomer is usually 20% by mass or less, preferably 10% by mass or less, in the total monomer components of the copolymer. In addition, a lower limit is 0 mass % normally.
  • Examples of the vinyl monomer include compounds having a vinyl group in the molecule.
  • Examples of such compounds include vinyl ester monomers such as vinyl acetate, vinyl propionate, and vinyl laurate, and aromatic vinyl monomers such as styrene, chlorostyrene, chloromethylstyrene, ⁇ -methylstyrene, and other substituted styrenes. , polyalkylene glycol di(meth)acrylates, and the like. These may be used singly or in combination of two or more. Among them, vinyl acetate is preferred.
  • the content of the vinyl monomer is usually 40% by mass or less, preferably 35% by mass or less, and particularly preferably 30% by mass or less in the total monomer components of the copolymer.
  • a lower limit is 0 mass % normally.
  • alkyl (meth)acrylate monomers having 1 to 3 carbon atoms in the alkyl group examples include methyl (meth)acrylate, ethyl (meth)acrylate, n-propyl (meth)acrylate, i-propyl (meth)acrylate, and the like. is mentioned. These may be used singly or in combination of two or more. Among them, methyl (meth)acrylate is preferred.
  • the content of the alkyl (meth)acrylate monomer having 1 to 3 carbon atoms in the alkyl group is usually 40% by mass or less, preferably 35% by mass or less, particularly preferably 25% by mass, in the total monomer components of the copolymer. % or less. In addition, a lower limit is 0 mass % normally.
  • Examples of other copolymerizable monomers include acid anhydride group-containing monomers such as maleic anhydride and itaconic anhydride; heterocyclic basic monomers such as vinylpyrrolidone, vinylpyridine and vinylcarbazole; and macromonomers. be done. These may be used singly or in combination of two or more.
  • the content of the other copolymerizable monomers is usually 10% by mass or less, preferably 5% by mass or less, in the total monomer components of the copolymer.
  • a lower limit is 0 mass % normally.
  • the (meth)acrylic copolymer (A) obtained by copolymerizing the above various monomer components may be used, and the copolymerization method is also conventionally known, for example, solution radical polymerization, suspension polymerization, bulk polymerization, It may be carried out according to emulsion polymerization or the like.
  • the glass transition temperature (Tg) of the (meth)acrylic copolymer (A) thus obtained is usually -100 to 25°C, preferably -80 to 20°C, and particularly preferably -50 to 15. °C.
  • the (meth)acrylic copolymer (meth)acrylic copolymer ( The glass transition temperature (Tg) of A1) is usually -100 to 0°C, preferably -50 to -5°C, from the viewpoint of lamination reliability.
  • the glass transition temperature of the (meth)acrylic copolymer (A2) contained in the resin composition forming the intermediate layer is usually -80 to 25°C. Yes, preferably -50 to 20°C.
  • the glass transition temperature of the (meth)acrylic copolymer (A2) contained in the resin composition forming the intermediate layer is From the viewpoint of bonding reliability, it is preferably higher than or equal to the glass transition temperature of the copolymer (A1).
  • the glass transition temperature is the peak temperature of the loss tangent (Tan ⁇ ) obtained by the following dynamic viscoelasticity measurement in shear mode at a frequency of 1 Hz.
  • Tan ⁇ loss tangent
  • a sample to be measured is laminated so as to have a thickness of 0.6 to 0.8 mm, and is punched out into a circular shape with a diameter of 8 mm to obtain a measurement sample.
  • the dynamic viscoelastic spectrum of this measurement sample is measured using a rheometer (manufactured by TA Instruments, "Discovery HR2") under the following measurement conditions. From the data obtained by the measurement, the temperature at which Tan ⁇ reaches the maximum value is read.
  • the sample to be used may be before curing or after curing.
  • Adhesive jig ⁇ 8mm parallel plate Distortion: 0.1% Frequency: 1Hz Temperature: -120 to 200°C Heating rate: 5°C/min
  • the glass transition temperature (Tan ⁇ ) of the (meth)acrylic copolymer (A) is a numerical value when the thickness is 0.6 to 0.8 mm. This is because, in order to accurately measure the glass transition temperature (Tan ⁇ ) of the (meth)acrylic copolymer (A), the measurement result will fluctuate due to the influence of the measuring jig due to insufficient thickness of the sample. This is because it should be avoided. Therefore, when measuring the glass transition temperature (Tan ⁇ ), it is necessary to measure after adjusting the thickness of the sample to a certain range.
  • the (meth)acrylic copolymer (A) can be measured without being affected by the measurement jig.
  • the glass transition temperature (Tan ⁇ ) of coalescence (A) can be accurately grasped.
  • the weight average molecular weight of the (meth)acrylic copolymer (A) is generally 50,000 to 1,500,000, preferably 70,000 to 1,300,000, and particularly preferably 100,000 to 1,200,000. Further, the weight-average molecular weight of the (meth)acrylic copolymer (A1) contained in the resin composition forming the surface layer and the back layer (the outermost layer and the outermost layer in the case of three or more layers) of the pressure-sensitive adhesive sheet is It is usually 200,000 to 1,500,000, preferably 300,000 to 1,000,000, particularly preferably 300,000 to 700,000.
  • the weight average molecular weight of the (meth)acrylic copolymer (A2) contained in the resin composition forming the intermediate layer is usually 50,000 to 1,000,000, preferably 100,000. ⁇ 800,000, particularly preferably 200,000 to 600,000.
  • the weight average molecular weight is measured by the following method.
  • (Meth)acrylic copolymer (A) dissolved in tetrahydrofuran was used as a measurement sample, and the following was performed using a gel permeation chromatography (GPC) analyzer (manufactured by Tosoh Corporation, HLC-8320GPC).
  • GPC gel permeation chromatography
  • Mw weight average molecular weight
  • the resin composition forming the pressure-sensitive adhesive sheet preferably contains a cross-linking agent (B) and a photopolymerization initiator (C) in addition to the (meth)acrylic copolymer (A) from the viewpoint of adhesive strength. .
  • the resin composition forming the intermediate layer preferably contains the cross-linking agent (B), particularly preferably the cross-linking agent (B ) and a photoinitiator (C).
  • the resin composition forming the outermost layer and the innermost layer preferably contains a photopolymerization initiator (C).
  • Crosslinking agent (B) examples include (meth)acryloyl groups, epoxy groups, isocyanate groups, carboxy groups, hydroxy groups, carbodiimide groups, oxazoline groups, aziridine groups, vinyl groups, amino groups, imino groups, and amide groups.
  • a cross-linking agent having at least one selected cross-linkable functional group is included. These may be used alone or in combination of two or more.
  • the cross-linking agent (B) also includes a mode in which the cross-linking agent (B) is chemically bonded to the (meth)acrylic copolymer (A).
  • cross-linking agents having (meth)acryloyl groups are preferred, and polyfunctional (meth)acrylates are particularly preferred.
  • polyfunctional refers to those having two or more crosslinkable functional groups.
  • the crosslinkable functional group may be protected with a deprotectable protecting group.
  • polyfunctional (meth)acrylate examples include 1,4-butanediol di(meth)acrylate, glycerin di(meth)acrylate, neopentyl glycol di(meth)acrylate, glycerin glycidyl ether di(meth)acrylate, 1 ,6-hexanediol di(meth)acrylate, 1,9-nonanediol di(meth)acrylate, tricyclodecane dimethacrylate, tricyclodecanedimethanol di(meth)acrylate, bisphenol A polyethoxydi(meth)acrylate, bisphenol A Polypropoxy di (meth) acrylate, bisphenol F polyethoxy di (meth) acrylate, ethylene glycol di (meth) acrylate, neopentyl glycol di (meth) acrylate, trimethylolpropane trioxyethyl (meth) acrylate, ⁇ -caprolact
  • the content of the crosslinking agent (B) is preferably 0.5 to 50 parts by mass, more preferably 1 to 40 parts by mass with respect to 100 parts by mass of the (meth)acrylic copolymer (A). parts, particularly preferably 5 to 30 parts by mass.
  • Photopolymerization initiator (C) As the photopolymerization initiator (C), currently known ones can be used as appropriate, and among them, a photopolymerization initiator sensitive to ultraviolet rays having a wavelength of 380 nm or less is preferred from the viewpoint of ease of control of the cross-linking reaction. preferred from
  • the photopolymerization initiator (C) is roughly classified into two groups according to the mechanism of radical generation.
  • a photopolymerization initiator and a hydrogen donor in the system form an exciplex, and are roughly classified into hydrogen abstraction type photopolymerization initiators capable of transferring hydrogen from the hydrogen donor.
  • the cleavage-type photopolymerization initiator decomposes into a different compound when radicals are generated by light irradiation, and once excited, it ceases to function as a reaction initiator. Therefore, it is preferable because it does not remain as an active species in the pressure-sensitive adhesive sheet after the crosslinking reaction is completed, and there is no possibility that the pressure-sensitive adhesive sheet will be unexpectedly deteriorated by light.
  • hydrogen abstraction type photopolymerization initiators do not produce decomposed products like cleavage type photopolymerization initiators during the radical generation reaction due to irradiation of active energy rays such as ultraviolet rays, so they are less likely to become volatile components after the reaction, and adhesion It is useful in that damage to the body can be reduced.
  • cleavage-type photopolymerization initiator examples include 2,2-dimethoxy-1,2-diphenylethan-1-one, 1-hydroxycyclohexylphenylketone, 2-hydroxy-2-methyl-1-phenyl-propane- 1-one, 1-(4-(2-hydroxyethoxy)phenyl)-2-hydroxy-2-methyl-1-propan-1-one, 2-hydroxy-1-[4- ⁇ 4-(2-hydroxy -2-methyl-propionyl)benzyl ⁇ phenyl]-2-methyl-propan-1-one, oligo(2-hydroxy-2-methyl-1-(4-(1-methylvinyl)phenyl)propanone), phenylglyoxyl methyl acid, 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl)butan-1-one, 2-methyl-1-[4-(methylthio)phenyl]-2-morpholinopropane-1- on, 2-(dimethylamino)-2-[(4-methylphenyl
  • Examples of the hydrogen abstraction type photopolymerization initiator include benzophenone, 4-methylbenzophenone, 2,4,6-trimethylbenzophenone, 4-phenylbenzophenone, 3,3′-dimethyl-4-methoxybenzophenone, and 2-benzoylbenzophenone.
  • the photopolymerization initiator (C) is not limited to the substances listed above.
  • the photopolymerization initiator (C) either one of a cleavage-type photopolymerization initiator and a hydrogen abstraction-type photopolymerization initiator may be used, or both may be used in combination.
  • the content of the photopolymerization initiator (C) is not particularly limited, it is usually 0.1 to 10 parts by weight, preferably 100 parts by weight of the (meth)acrylic copolymer (A). is 0.2 to 5 parts by weight, particularly preferably 0.3 to 3 parts by weight. By setting the content of the photopolymerization initiator (C) within the above range, appropriate reaction sensitivity to active energy rays can be obtained.
  • silane coupling agent (D) it is preferable to add a silane coupling agent (D) to the resin composition in order to improve adhesion to members for forming an image display device, particularly to glass.
  • the silane coupling agent (D) is preferably contained in the resin composition forming the (meth)acrylic pressure-sensitive adhesive layer in contact with the image display device constituent member.
  • silane coupling agent (D) examples include compounds having a hydrolyzable functional group such as an alkoxy group together with an unsaturated group such as a vinyl group, an acryloxy group and a methacryloxy group, an amino group, an epoxy group, and the like. can be mentioned.
  • silane coupling agent (D) examples include N-(2-aminoethyl)-3-aminopropyltrimethoxysilane, N-(2-aminoethyl)-3-aminopropylmethyldimethoxysilane, 3-amino propyltriethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-methacryloxypropyltriethoxysilane and the like. These may be used alone or in combination of two or more. Among them, 3-glycidoxypropyltriethoxysilane is preferable because it has good adhesiveness to members for forming an image display device and causes little discoloration such as yellowing.
  • the content of the silane coupling agent (D) is preferably 0.01 to 5 parts by mass, particularly preferably 0.2 to 3 parts by mass, relative to 100 parts by mass of the (meth)acrylic copolymer (A). .0 parts by mass.
  • a coupling agent such as an organic titanate compound can also be effectively used in the same manner as the silane coupling agent (D).
  • the resin composition may contain a metal corrosion inhibitor (E).
  • the metal corrosion inhibitor (E) is preferably contained in the pressure-sensitive adhesive composition forming the (meth)acrylic pressure-sensitive adhesive layer in contact with the image display device constituent member.
  • metal corrosion inhibitor (E) examples include benzotriazole compounds, benzimidazole compounds, benzothiazole compounds, and other triazole derivatives.
  • the metal corrosion inhibitor (E) is preferably one or more selected from benzotriazole compounds, 1,2,3-triazole and 1,2,4-triazole.
  • benzotriazole compounds 1,2,3-triazole and 1,2,4-triazole.
  • triazole derivatives such as 1,2,3-triazole and 1,2,4-triazole are preferable, especially 1,2,3-triazole, because they are excellent in reliability as an adhesive sheet in addition to metal corrosion prevention properties. is preferred.
  • the content of the metal corrosion inhibitor (E) is, from the viewpoint of bleed-out of the metal corrosion inhibitor and the effect of preventing metal corrosion, from the viewpoint of 0.00% per 100 parts by mass of the (meth)acrylic copolymer (A). 01 to 5 parts by mass, more preferably 0.03 to 1 part by mass, and particularly preferably 0.05 to 0.5 parts by mass.
  • the resin composition may contain other additives in addition to the above components.
  • the other additives include light stabilizers, ultraviolet absorbers, metal deactivators, anti-aging agents, antistatic agents, moisture absorbers, foaming agents, antifoaming agents, inorganic particles, viscosity modifiers, Various additives such as tackifying resins, photosensitizers, and fluorescent agents, and reaction catalysts (tertiary amine compounds, quaternary ammonium compounds, tin laurate compounds, etc.) can be used. These may be used alone or in combination of two or more. In addition, other known components that are blended in ordinary resin compositions may be contained as appropriate.
  • the resin composition contains a (meth)acrylic copolymer (A), preferably a cross-linking agent (B), a photopolymerization initiator (C), optionally a silane coupling agent (D), and a metal corrosion inhibitor. It is obtained by mixing (E) and other additives.
  • the mixing method of these components is not particularly limited, and the mixing order of each component is also not particularly limited.
  • a heat treatment step may be added during the production of the resin composition, and in this case, it is desirable to mix the components of the resin composition in advance and then perform the heat treatment. In the above mixing, a masterbatch obtained by concentrating various mixed components may be used.
  • the mixing method is not particularly limited, and for example, a universal kneader, planetary mixer, Banbury mixer, kneader, gate mixer, pressure kneader, triple roll, double roll, etc. can be used.
  • a universal kneader, planetary mixer, Banbury mixer, kneader, gate mixer, pressure kneader, triple roll, double roll, etc. can be used.
  • they may be mixed using a solvent, if necessary, or may be mixed as a solvent-free system containing no solvent.
  • the method for producing the pressure-sensitive adhesive sheet of the present invention is described below, but the method is not limited to this method.
  • the pressure-sensitive adhesive sheet of the present invention is preferably produced as a pressure-sensitive adhesive sheet with a release film provided with the above-described release film, and particularly preferably, the pressure-sensitive adhesive sheet is provided with the above-described release film on both sides by the following steps. , is to be manufactured as a pressure-sensitive adhesive sheet with a double-sided release film. Also, the preliminary curing described below may be omitted.
  • a resin composition is heated and melted (hot melt), coated on a release film, sandwiched between another release film, and heated to prepare a single-layer pressure-sensitive adhesive sheet with a double-sided release film. .
  • a single-layer pressure-sensitive adhesive sheet with a double-sided release film By preparing the required number of layers of this single-layer pressure-sensitive adhesive sheet with double-sided release film, peeling off the release film, and laminating the pressure-sensitive adhesive sheets, a multilayer structure of two or more layers is formed.
  • a pressure-sensitive adhesive sheet with a double-sided release film can be obtained.
  • the pressure-sensitive adhesive sheet with a double-sided release film may be provided with the release film on at least one surface, preferably one surface, of the pressure-sensitive adhesive sheet finally obtained, and the release film is provided on the other surface.
  • the mold film may be a known general release film.
  • the obtained pressure-sensitive adhesive sheet with a double-sided release film is preferably pre-cured by cross-linking with active energy rays so as to have latent active energy ray reactivity, in other words, to leave active energy ray reactivity.
  • each layer may be crosslinked by irradiating active energy rays through the release film, and the gel fraction may be set within the range described above.
  • the degree of active energy ray cross-linking (gel fraction) by controlling the irradiation amount of the active energy ray. By doing so, it is also possible to adjust the degree of active energy ray cross-linking (gel fraction) by partially blocking the active energy ray.
  • Examples of the active energy rays include ionizing radiation such as ⁇ rays, ⁇ rays, neutron beams and electron beams, ultraviolet rays, visible rays, and the like. Among them, ultraviolet light is preferable from the viewpoint of suppressing damage to the constituent members of the image display device and controlling the reaction.
  • a resin composition on a release film to form a pressure-sensitive adhesive sheet after coating a resin composition on a release film to form a pressure-sensitive adhesive sheet, another resin composition is applied on the formed pressure-sensitive adhesive sheet to form a pressure-sensitive adhesive sheet.
  • a pressure-sensitive adhesive sheet with a double-sided release film having a multilayer structure of two or more layers.
  • At least one of the constituent members of the image display device used in the present invention has a curved shape, and examples of the curved shape include a curved shape with a radius of curvature of 10 mm or less.
  • Examples of the constituent members of the image display device include surface protection panels.
  • the surface protection panel for example, it is made of a material such as thin plate glass or plastic, and is positioned on the outermost surface layer of the laminate for image display device, which is called a cover film, to protect the impact from the outside.
  • a cover film A member to be used is mentioned.
  • the curved surface member having the curved shape may be one in which a touch panel function is integrated, such as a touch-on-lens (TOL) type or a one glass solution (OGS) type.
  • the curvature radius of the image display device component having the curved shape is preferably 10 mm or less, more preferably 5 mm or less, and particularly preferably 3 mm or less.
  • the lower limit is usually 1 mm.
  • the image display device component particularly the image display device component having a curved shape, preferably has a stepped portion with a height difference of 5 ⁇ m or more, and more preferably has a stepped portion of 7 ⁇ m or more.
  • the upper limit is usually 50 ⁇ m.
  • the constituent members of the image display device are often printed for the purpose of decoration or light shielding, and the thickness of this printing serves as a stepped portion.
  • the pressure-sensitive adhesive sheet used in the present invention particularly preferably has a multi-layer structure of two or more layers, and is excellent in step followability, so that even if there is such a stepped portion, it can be laminated without creating a gap be able to.
  • the thickness of the image display component is usually 100 to 2000 ⁇ m, preferably 150 to 1500 ⁇ m, particularly preferably 200 to 1000 ⁇ m.
  • the pressure-sensitive adhesive sheet with a release film and the image display device constituent member having the curved shape are composed of a release film/adhesive sheet/curved shape. It is formed by laminating the constituent members in order.
  • the pressure-sensitive adhesive sheet is usually manufactured as a pressure-sensitive adhesive sheet with a double-sided release film provided with the release film.
  • the laminate for an image display device with a release film of the present invention is produced by the following steps 1 and 2.
  • Step 1 A step of preparing an image display device member having a curved shape and an adhesive sheet with a double-sided release film.
  • Step 2 A step of peeling off one of the release films of the pressure-sensitive adhesive sheet with a release film and laminating it to a component for forming an image display device having a curved shape to obtain a laminate for an image display device with a release film.
  • Step 1 is a step of preparing the image display device member having the curved shape and the pressure-sensitive adhesive sheet with a double-sided release film.
  • step 2 one of the release films of the pressure-sensitive adhesive sheet with a release film is peeled off, and a laminate for an image display device with a release film is obtained by laminating it to a component for forming an image display device having a curved shape. is.
  • the release film When peeling the release film from the adhesive sheet with the double-sided release film, the release film having a 180 ° peel force of 0.06 to 0.20 N / cm at a tensile speed of 300 mm / min for the adhesive sheet is attached to the adhesive sheet. All you have to do is leave it.
  • the bonding method is not particularly limited, and examples thereof include atmospheric bonding such as press and roll bonding, and vacuum bonding. Autoclave treatment may also be performed. These may be used alone or in combination.
  • the thus-obtained laminate for an image display device with a release film of the present invention has excellent storage stability because the release film does not rise from the pressure-sensitive adhesive sheet during storage, and also has excellent lamination reliability. be.
  • the laminate for image display devices is obtained by performing the following steps 3 and 4 in this order using the laminate for image display devices with the release film.
  • Step 3 A step of peeling the release film from the laminate for an image display device with the release film and bonding it to another constituent member of the image display device.
  • Step 4 A step of irradiating an active energy ray through an image display device component having a curved shape and/or other image display device component to cure the pressure-sensitive adhesive sheet to obtain a laminate for image display device.
  • the step 3 is a step of peeling off the release film from the release film-attached laminate for an image display device, and bonding it to another constituent member of the image display device.
  • Examples of other constituent members of the image display device include glass, touch sensors, image display panels, polarizing films, retardation films, and polyester resin films. These image display devices may be used singly or in combination of two or more. Among them, a polyester resin film is preferable in the present invention.
  • the bonding method is not particularly limited, and the method described in step 2 can be used.
  • an image display device component having a curved shape and/or another image display device component is irradiated with an active energy ray to cure the pressure-sensitive adhesive sheet to obtain a laminate for an image display device. It is a process.
  • the active energy rays include ionizing radiation such as ⁇ rays, ⁇ rays, neutron beams and electron beams, ultraviolet rays, visible rays, and the like. Among them, ultraviolet light is preferable from the viewpoint of suppressing damage to the constituent members of the image display device and controlling the reaction.
  • the gel fraction of the pressure-sensitive adhesive sheet after curing is preferably within the range described above.
  • the laminate for an image display device thus obtained can be suitably used as a repair member when a surface protection panel of a smartphone or the like made of glass, plastic, or the like is damaged.
  • a new image display device can be obtained by exchanging the laminate for image display device.
  • ⁇ Release film> As the release film, a release-treated polyethylene terephthalate film was used.
  • ⁇ Light release film 1 Diafoil MRT38 (manufactured by Mitsubishi Chemical Corporation, thickness 38 ⁇ m)
  • Light release film 2 Diafoil MRQ75 (manufactured by Mitsubishi Chemical Corporation, thickness 75 ⁇ m)
  • Light release film 3 Diafoil MRQ50 (manufactured by Mitsubishi Chemical Corporation, thickness 50 ⁇ m)
  • Heavy release film 1 Diafoil MRV75 (V08) (manufactured by Mitsubishi Chemical Corporation, thickness 75 ⁇ m)
  • Heavy release film 2 Diafoil MRV50 (V03) (manufactured by Mitsubishi Chemical Corporation, thickness 50 ⁇ m)
  • Heavy release film 3 Diafoil MRV75 (V06) (manufactured by Mitsubishi Chemical Corporation, thickness 75 ⁇ m)
  • Heavy release film 4 Diafoil MRV75 (V03) (manufactured by Mitsubishi Chemical
  • Example 1 A (meth)acrylic copolymer (A-1) 100 parts by mass, a cross-linking agent (B-1) 20 parts by mass, and an initiator (C-1) 1.5 parts by mass are uniformly mixed to obtain a resin composition. Item 1 was made. The resin composition 1 is sandwiched between the light release film 1 and the light release film 2, that is, two release films, and formed into a sheet at a temperature of 80 ° C. so that the thickness is 75 ⁇ m. A pressure-sensitive adhesive sheet (1) with a mold film was produced.
  • (Meth) acrylic copolymer (A-1) 100 parts by weight, an initiator (C-1) 2.4 parts by weight, an initiator (C-2) 0.6 parts by weight, a silane coupling agent (D-1) 0.1 part by mass was uniformly mixed to prepare a resin composition 2.
  • the resin composition 2 was sandwiched between the light release film 1 and the light release film 2, that is, two release films, and formed into a sheet at a temperature of 80 ° C. so that the thickness was 25 ⁇ m.
  • a pressure-sensitive adhesive sheet (1-1) with a release film was produced.
  • the resin composition 2 is sandwiched between a light release film 1 and a heavy release film 1, that is, two release films, and shaped into a sheet at a temperature of 80 ° C. so that the thickness is 25 ⁇ m.
  • a pressure-sensitive adhesive sheet (1-2) with a double-sided release film was prepared.
  • a glass plate having a size of 156 mm ⁇ 73 mm ⁇ 0.5 mm in thickness and curved with a radius of curvature of 3 mm at the end on the long side was prepared as a component of the image display device.
  • This member had a print with a width of 2 mm and a thickness of 10 ⁇ m along the circumference of the inner curved surface.
  • Lamination is performed under conditions of 30° C., pressure of 0.1 MPa, and pressure time of 30 seconds, and a heavy release film 1 as a release film, an adhesive sheet, and an image display device component having a curved shape are laminated in this order.
  • a laminate for image display with a release film was produced.
  • Examples 2 to 5 Comparative Example 1
  • a pressure-sensitive adhesive sheet with a double-sided release film and an image with a release film were prepared in the same manner as in Example 1, except that the resin composition and the release film used in Example 1 were as shown in Table 1 below.
  • a laminate for display was produced.
  • the release film for which the peel force was measured was cut into strips with a width of 4 mm and a length of 37 mm so that the long side was TD (vertical direction), and a dynamic viscoelasticity measuring device (manufactured by IT Keisoku Control Co., Ltd., DVA-200 ) was used to perform dynamic viscoelasticity measurement at a tensile mode, a frequency of 1 Hz, a measurement temperature of 0 to 80°C, and a heating rate of 3°C/min to obtain the elastic modulus (G') at a temperature of 25°C. From the longitudinal elastic modulus of the release film measured above, the flexural rigidity (MPa ⁇ m 4 ) per unit length was obtained from the following formula.
  • ⁇ Asker hardness> The release film of the pressure-sensitive adhesive sheet with a double-sided release film was peeled off, and the exposed pressure-sensitive adhesive surfaces were sequentially overlapped to laminate a plurality of pressure-sensitive adhesive sheets so that the total thickness was in the range of 5 to 7 mm. As a result, the influence of the hardness of the stage on which the measurement sample is placed can be reduced, and the hardness peculiar to the material can be compared and measured. Then, the tip terminal of an Asker C2L hardness tester was pressed against the exposed adhesive surface of the laminated adhesive sheet from a height of 10 mm with a load of 1 kg vertically downward at a rate of 3 mm/min to measure the C2 Asker hardness of the adhesive sheet. .
  • the pressure-sensitive adhesive sheet with a double-sided release film was cured by irradiating the pressure-sensitive adhesive sheet with ultraviolet light through the release film using a high-pressure mercury lamp so that the integrated amount of light at 365 nm was 2000 mJ/cm 2 .
  • the gel fraction after curing with active energy rays was obtained in the same manner as the gel fraction evaluation procedure described above.
  • ⁇ Adhesive strength> The light release film of the pressure-sensitive adhesive sheet with a double-sided release film was peeled off, and a 100 ⁇ m-thick polyethylene terephthalate film (“Cosmoshine A4300” manufactured by Toyobo Co., Ltd.) was laminated as a backing film to prepare a laminate. After cutting the laminate to a length of 150 mm and a width of 10 mm, the pressure-sensitive adhesive surface exposed by peeling off the heavy release film was roll-bonded to the pressure-sensitive adhesive sheet by reciprocating a hand roller once on soda-lime glass at a temperature of 40 ° C. After curing for 3 hours, it was finished and pasted. The adhesive force measurement sample was peeled off at a peel angle of 180° and a peel speed of 60 mm/min under an environment of 23° C. temperature and 50% RH, and the peel force (N/cm) to glass was measured.
  • ⁇ Adhesive strength (after curing)> The light release film of the pressure-sensitive adhesive sheet with a double-sided release film was peeled off, and a 100 ⁇ m-thick polyethylene terephthalate film (“Cosmoshine A4300” manufactured by Toyobo Co., Ltd.) was laminated as a backing film to prepare a laminate. After cutting the laminate to a length of 150 mm and a width of 10 mm, the pressure-sensitive adhesive surface exposed by peeling off the heavy release film was roll-bonded with the pressure-sensitive adhesive sheet by moving a hand roller back and forth once against soda-lime glass. After curing the laminated product for 3 hours at a temperature of 40° C.
  • the adhesive sheet was cured by irradiating ultraviolet rays of 365 nm through the backing film so that the integrated light quantity was 2000 mJ/cm 2 , and cured for 15 hours. and used as an adhesive force measurement sample.
  • This adhesive force measurement sample was peeled off at a peeling angle of 180° and a peeling speed of 60 mm/min in an environment of a temperature of 23°C and a humidity of 50% RH, and the peeling force (N/cm) to the glass was measured. The adhesive strength after curing was determined.
  • ⁇ Lamination reliability> After peeling off the release film from the obtained laminate for an image display device with a release film, and arranging a polyethylene terephthalate film of 100 ⁇ m so as to face the exposed adhesive surface, using a diaphragm type vacuum bonding device, the temperature is 30. C., a pressure of 0.1 MPa, and a pressing time of 30 seconds to prepare five samples for evaluation of bonding reliability.
  • the samples were visually observed after being stored for 3 days in an environment with a temperature of 23° C. and a humidity of 50%, and evaluated according to the following evaluation criteria. [Evaluation criteria] (double-circle) (excellent): Lifting and peeling were not seen in 5 sheets. ⁇ (good): Lifting or peeling was observed in one of the five sheets. x (poor): Lifting or peeling of the adhesive sheet was observed along the curved portion in two or more of the five sheets.
  • the image display device laminates with release films of Examples 1 to 5 are composed of a release film, an adhesive sheet, and an image display device component having a curved portion because the release force of the release film is in an appropriate range.
  • the release film was not lifted, and the storage stability was excellent.
  • the pressure-sensitive adhesive sheet has a multi-layer structure of two or more layers, the bonding reliability was also excellent.
  • the release film laminate with a release film of Comparative Example 1 since the release force of the release film was less than 0.06 N / cm, the release film was observed to float, and the image display laminate was storage stable. It was of inferior quality.
  • the pressure-sensitive adhesive sheet with a release film and the laminate for an image display device with a release film of the present invention do not lift the release film from the pressure-sensitive adhesive sheet, have excellent storage stability, and also exhibit excellent bonding reliability. Since it has, it can be suitably used as a repair member for surface protection panels of smartphones and the like.

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  • Chemical Kinetics & Catalysis (AREA)
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PCT/JP2021/047567 2021-01-28 2021-12-22 離型フィルム付き粘着シート、離型フィルム付き画像表示装置用積層体および画像表示装置用積層体の製造方法 WO2022163233A1 (ja)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024063128A1 (ja) * 2022-09-22 2024-03-28 リンテック株式会社 積層体
WO2024117165A1 (ja) * 2022-11-30 2024-06-06 三菱ケミカル株式会社 粘着剤組成物、粘着シート、離型フィルム付き粘着シート、画像表示装置用積層体、画像表示装置、及び有機ｅｌ表示装置用粘着シート

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3175309U (ja) * 2012-02-07 2012-05-10 株式会社パワーサポート 粘着材付曲面保護フィルム
JP2015174903A (ja) * 2014-03-14 2015-10-05 旭硝子株式会社 両面粘着フィルム、粘着層付き透明面材
JP2016012132A (ja) * 2014-06-04 2016-01-21 恵和株式会社 画像表示装置用シート、画像表示装置用積層体及び画像表示装置
JP2017083595A (ja) * 2015-10-27 2017-05-18 三菱電機株式会社 湾曲型液晶表示装置、および液晶パネルの製造方法
JP2018048317A (ja) * 2016-09-15 2018-03-29 三菱ケミカル株式会社 粘着シート積層体、賦形粘着シート積層体及びその製造方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5138898Y2 (enrdf_load_stackoverflow) 1972-10-11 1976-09-24
JPS6062740U (ja) 1983-10-06 1985-05-02 ホシデン株式会社 スライドスイツチ
CN108473835B (zh) * 2015-12-25 2021-03-02 三菱化学株式会社 导电构件用粘合片、导电构件层叠体及图像显示装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3175309U (ja) * 2012-02-07 2012-05-10 株式会社パワーサポート 粘着材付曲面保護フィルム
JP2015174903A (ja) * 2014-03-14 2015-10-05 旭硝子株式会社 両面粘着フィルム、粘着層付き透明面材
JP2016012132A (ja) * 2014-06-04 2016-01-21 恵和株式会社 画像表示装置用シート、画像表示装置用積層体及び画像表示装置
JP2017083595A (ja) * 2015-10-27 2017-05-18 三菱電機株式会社 湾曲型液晶表示装置、および液晶パネルの製造方法
JP2018048317A (ja) * 2016-09-15 2018-03-29 三菱ケミカル株式会社 粘着シート積層体、賦形粘着シート積層体及びその製造方法

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024063128A1 (ja) * 2022-09-22 2024-03-28 リンテック株式会社 積層体
JPWO2024063128A1 (enrdf_load_stackoverflow) * 2022-09-22 2024-03-28
WO2024117165A1 (ja) * 2022-11-30 2024-06-06 三菱ケミカル株式会社 粘着剤組成物、粘着シート、離型フィルム付き粘着シート、画像表示装置用積層体、画像表示装置、及び有機ｅｌ表示装置用粘着シート

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