WO2020175089A1 - Stratifié souple - Google Patents

Stratifié souple Download PDF

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Publication number
WO2020175089A1
WO2020175089A1 PCT/JP2020/004752 JP2020004752W WO2020175089A1 WO 2020175089 A1 WO2020175089 A1 WO 2020175089A1 JP 2020004752 W JP2020004752 W JP 2020004752W WO 2020175089 A1 WO2020175089 A1 WO 2020175089A1
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WO
WIPO (PCT)
Prior art keywords
pressure
sensitive adhesive
layer
adhesive layer
meth
Prior art date
Application number
PCT/JP2020/004752
Other languages
English (en)
Japanese (ja)
Inventor
昇祐 李
正熙 金
Original Assignee
住友化学株式会社
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 住友化学株式会社 filed Critical 住友化学株式会社
Priority to CN202080016365.7A priority Critical patent/CN113474698A/zh
Priority to KR1020217028446A priority patent/KR20210130165A/ko
Publication of WO2020175089A1 publication Critical patent/WO2020175089A1/fr

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
    • 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
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/022—Mechanical properties
    • 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
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/023—Optical properties
    • 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
    • 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
    • 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]
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3083—Birefringent or phase retarding elements
    • 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
    • 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
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133528—Polarisers
    • 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
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/13363—Birefringent elements, e.g. for optical compensation
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • 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
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/50—OLEDs integrated with light modulating elements, e.g. with electrochromic elements, photochromic elements or liquid crystal elements

Definitions

  • the present invention relates to a flexible laminate.
  • Patent Document 1 Japanese Unexamined Patent Publication No. 20 18 _ 285 73
  • Patent Document 1 describes a laminate for a flexible image display device having a plurality of pressure-sensitive adhesive layers.
  • Patent Document 1 Japanese Patent Laid-Open No. 2 0 18 _ 2 8 5 7 3
  • a display device including a laminate having a front plate and a plurality of pressure-sensitive adhesive layers
  • air bubbles may be generated in the pressure-sensitive adhesive layer in the laminate when the front plate side is inwardly bent repeatedly.
  • the adhesive force of the pressure-sensitive adhesive layer was weak, and in some cases floating or peeling occurred between the pressure-sensitive adhesive layer and the adherend.
  • An object of the present invention is to provide a flexible laminate having excellent adhesive strength, in which generation of bubbles is suppressed even when repeatedly bent with the front plate side inside, and a pressure-sensitive adhesive composition and adhesive used for the same. Is to provide a sheet.
  • the present invention provides the following flexible laminate, pressure-sensitive adhesive composition and pressure-sensitive adhesive sheet.
  • the first pressure-sensitive adhesive composition and the second pressure-sensitive adhesive composition each include a (meth) acrylic polymer
  • the (meth)acrylic polymer has a weight average molecular weight (IV!%) of not less than 200,000 and not more than 150,000, which is the flexible laminate according to [1] or [2].
  • Fig. 1 is a schematic cross-sectional view showing an example of a laminate according to the present invention.
  • FIG. 2 A schematic cross-sectional view showing an example of a laminate according to the present invention. ⁇ 2020/175089 3 ⁇ (: 170? 2020 /004752
  • FIG. 3 is a schematic view illustrating a method of a bending test.
  • Fig. 4 is a cross-sectional view schematically showing the method for producing a laminate of the present invention.
  • FIG. 1 shows a schematic cross-sectional view of a laminate according to one embodiment of the present invention.
  • the laminate 100 includes a front plate 101, a first adhesive layer 102, a polarizer layer 103, a second adhesive layer 104, and a back plate 105. Include in order.
  • the first pressure-sensitive adhesive layer 10 2 is formed from the first pressure-sensitive adhesive composition
  • the second pressure-sensitive adhesive layer 10 4 is formed from the second pressure-sensitive adhesive composition.
  • the first pressure-sensitive adhesive layer 102 and the second pressure-sensitive adhesive layer 104 may be collectively referred to as a pressure-sensitive adhesive layer.
  • the thickness of the laminated body 100 is not particularly limited as it varies depending on the function required for the laminated body and the application of the laminated body, but is, for example, 50 or more and 4,00 or less, and preferably It is 1 00 or more and 2 00 0 or less, and more preferably 1 500 1 or more and 1 00 0 or less.
  • the planar shape of the laminate 100 may be, for example, a rectangular shape, preferably a rectangular shape having a long side and a short side, and more preferably a rectangular shape.
  • the long side has a length of, for example, 10
  • the length of the short side is, for example, 5 Or less, preferably less than or equal to, more preferably 50 or more 3
  • Each of the constituent layers may have a corner portion machined, an end portion cut-out machined, or a hole machined.
  • the laminated body 100 can be used, for example, in a display device or the like.
  • the display device is not particularly limited, and examples thereof include an organic electroluminescence (organic light !_) display device, an inorganic electroluminescent (inorganic light !_) display device, a liquid crystal display device, and an electroluminescent display device.
  • the display device has a touch panel function ⁇ 2020/175089 4 ⁇ (: 170? 2020 /004752
  • the laminate 100 has a shear creep rate of 8 1 [%] at a temperature of 25° for the first adhesive layer 10 2 and a temperature of the second adhesive layer 10 4
  • the shear creep rate [3 ⁇ 4 0 1 [%] at the temperature of the first standard adhesive layer of 25 ° is the following relational expression (1 3):
  • the laminated body 100 can be bent with the front plate 101 side facing inward.
  • a display device including a laminate is repeatedly bent with the front plate side facing inward, bubbles may be generated in the adhesive layer.
  • the generation of such bubbles is particularly remarkable in the pressure-sensitive adhesive layer close to the front plate side, that is, in the first pressure-sensitive adhesive layer 102 in the laminate 100.
  • the front plate 1 ⁇ 2020/175089 5 (: 170? 2020 /004752
  • the laminate 100 may be bendable with the front plate side facing outward.
  • a display device to which the laminated body 100 is applied can be used as a flexible display that can be bent or rolled.
  • bending includes a form of bending in which a curved surface is formed in the bending portion, and the bending radius of the bent inner surface is not particularly limited. Bending also includes refraction in which the inner surface has a refraction angle of greater than 0 degrees and less than 180 degrees, and folds in which the inner surface has a bending radius close to zero, or the inner surface has a refraction angle of 0 degree.
  • the first adhesive composition and the second adhesive composition are prepared so that the shear creep rates of the first adhesive layer 102 and the second adhesive layer 104 satisfy the relational expression (1). ⁇ 2020/175089 6 ⁇ (: 170? 2020 /004752
  • the pressure-sensitive adhesive layer may be composed of the pressure-sensitive adhesive composition described below, the type of the monomer constituting the (meth)acrylic polymer 8 described below may be changed, or the molecular weight of the (meth)acrylic polymer 8 may be changed. Examples thereof include a method of adjusting and a compound having a ketoprofen group.
  • the first pressure-sensitive adhesive layer 102 and the second pressure-sensitive adhesive layer 104 are, in one form, formed from (medium) a pressure-sensitive adhesive composition containing an acrylic polymer (hereinafter also referred to as a pressure-sensitive adhesive composition 8).
  • the pressure-sensitive adhesive composition may be an active energy ray curable type or a thermosetting type.
  • the “(meth)acrylic polymer” means at least one selected from the group consisting of acrylic polymers and methacrylic polymers. The same applies to other terms with "(meta)".
  • the (meth)acrylic polymer may be the same or different.
  • the (meth)acrylic polymer contained in the pressure-sensitive adhesive composition 8 is also referred to as (meth)acrylic polymer 8.
  • the (meth)acrylic polymer 8 has a weight average molecular weight from the viewpoint of easily satisfying the relational expression (2) or the relational expression (3) in the obtained pressure-sensitive adhesive layer. Is preferably 200,000 or more and 150,000 or less, and more preferably 300,000 or more and 1,200,000 or less.
  • the constituent unit derived from the monomer having a reactive functional group is preferably less than 5 mass% based on the total mass of the polymer.
  • the reactive functional group include a hydroxyl group, a carboxyl group, an amino group, an amide group, and an epoxy group.
  • the (meth)acrylic polymer 8 contained in the pressure-sensitive adhesive composition 8 has a linear or branched carbon atom number of 1 or more 2 4
  • a constituent unit derived from a (meth)acrylic monomer having the following alkyl group can be included.
  • the (meth)acrylic monomer having a linear or branched alkyl group having 1 to 24 carbon atoms may be, for example, (meth)acrylic acid alkyl ester, and examples thereof include: (Meth) butyl acrylate, (meth) methyl acrylate, (meth) ethyl acrylate, (meth) hexyl acrylate, (meth) octyl acrylate, (meth) lauryl acrylate, (meth) isooctyl acrylate And (meth)isodecyl acrylate, 2-ethylhexyl (meth)acrylate, isobornyl (meth)acrylate, and the like.
  • the (meth)acrylic polymer 8 may be a polymer or copolymer having one or more of the (meth)acrylic acid alkyl ester as a monomer.
  • the content of the (meth)acrylic polymer 8 in the adhesive composition 8 is, for example, 50% by mass or more and 100% by mass or less based on 100 parts by mass of the solid content of the adhesive composition 8.
  • Weight average molecular weight of acrylic polymer 8 May be, for example, 200,000 or more and 800,000 or less, and is preferably 300,000 or more and 700,000 or less from the viewpoint of suppressing bubbles during bending.
  • the weight average molecular weight (1 ⁇ /1) can be measured according to the measuring method described in the section of Examples below.
  • the pressure-sensitive adhesive composition may contain one or more types of (meth)acrylic polymers. Further, the pressure-sensitive adhesive composition may contain only (meth)acrylic polymer 8 as its constituent component, or may further contain a crosslinking agent.
  • the cross-linking agent is a metal ion having a valence of 2 or more and forming a carboxylic acid metal salt with a carboxyl group; a polyamine compound ⁇ 2020/175089 8 ⁇ (: 170? 2020 /004752
  • the pressure-sensitive adhesive composition A contains a crosslinking agent
  • the content of the crosslinking agent may be, for example, 5 parts by mass or less, preferably 1 part by mass, relative to 100 parts by mass of the acrylic polymer A. It is preferably not more than 0.5 part by mass, more preferably not more than 0.5 part by mass, still more preferably not more than 0.1 part by mass, and it is most preferred that the pressure-sensitive adhesive composition A contains no crosslinking agent.
  • the active energy ray-curable pressure-sensitive adhesive composition has a property of being cured by being irradiated with an active energy ray such as an ultraviolet ray or an electron beam, and has adhesiveness even before irradiation with the active energy ray. It is a pressure-sensitive adhesive composition having a property that it can be brought into close contact with an adherend such as a film and is cured by irradiation with an active energy ray to adjust the adhesive force and the like.
  • the active energy ray-curable pressure-sensitive adhesive composition is preferably UV-curable.
  • the pressure-sensitive adhesive composition A is an active energy ray-curable pressure-sensitive adhesive composition
  • the pressure-sensitive adhesive composition A further contains an active energy ray-polymerizable compound, a photopolymerization initiator, a photosensitizer, and the like. be able to.
  • Examples of the active energy ray-polymerizable compound include a (meth)acrylate monomer having at least one (meth)acryloyloxy group in the molecule; a compound obtained by reacting two or more functional group-containing compounds, Examples thereof include (meth)acryl-based compounds such as (meth)acryloyloxy group-containing compounds such as (meth)acrylate oligomer_ having at least two (meth)acryloyloxy groups.
  • the pressure-sensitive adhesive composition A may contain the active energy ray-polymerizable compound in an amount of 0.1 part by mass or more and 10 parts by mass or less based on 100 parts by mass of the solid content of the adhesive composition A.
  • Examples of the photopolymerization initiator include benzophenone and benzyl dimethyl ketate. ⁇ 2020/175089 9 ⁇ (: 170? 2020 /004752
  • the pressure-sensitive adhesive composition contains a photopolymerization initiator
  • it may contain one kind or two or more kinds.
  • the pressure-sensitive adhesive composition contains a photopolymerization initiator the total content thereof is, for example, 0.001 part by mass or more based on 100 parts by mass of the solid content of the pressure-sensitive adhesive composition. It may be up to 0.0 parts by mass.
  • the adhesive composition preferably contains a compound having a ketoprofen group. At least one of the first pressure-sensitive adhesive composition and the second pressure-sensitive adhesive composition is preferably a pressure-sensitive adhesive composition containing a compound having a ketoprofen group. With the pressure-sensitive adhesive composition containing the compound having a ketoprofen group, the first reference pressure-sensitive adhesive layer and the second reference pressure-sensitive adhesive layer satisfying the above relational expressions (2) and (3) can be easily formed.
  • the pressure-sensitive adhesive composition may contain a compound having a ketoprofen group in an amount of 0.1 part by mass or more and 10 parts by mass or less in 100 parts by mass of the solid content of the pressure-sensitive adhesive composition, and 0.5 parts by mass or more 4 It is preferable to include less than or equal to parts by mass.
  • the compound having a ketoprofen group can have 1 to 4 ketoprofen groups in the molecule, and can have 1 to 3 ketoprofen groups.
  • Examples of the compound having a ketoprofen group include a compound represented by the following chemical formula () and a compound represented by the chemical formula (II).
  • the pressure-sensitive adhesive composition includes fine particles for imparting light-scattering properties, beads (resin beads, glass beads, etc.), glass fibers, resins other than base polymers, pressure-sensitive adhesives, fillers (metal powders). And other inorganic powders), antioxidants, UV absorbers ⁇ 2020/175089 10 ⁇ (: 170? 2020 /004752
  • the pressure-sensitive adhesive composition preferably does not contain an organic solvent from the viewpoint of preventing the problem of durability deterioration due to the residual solvent.
  • the pressure-sensitive adhesive layer When the pressure-sensitive adhesive layer is formed from the pressure-sensitive adhesive composition, the pressure-sensitive adhesive layer can be formed by applying the pressure-sensitive adhesive composition 8 onto a substrate.
  • the formed pressure-sensitive adhesive layer can be irradiated with an active energy ray to obtain a cured product having a desired degree of curing.
  • the (meth)acrylic polymer 8 is a (meth)acrylic polymer having an alkyl group with a carbon number of 2 to 20 as a monomer unit constituting the polymer. It is preferable to contain an acid alkyl ester and a monomer having a reactive functional group in the molecule (reactive functional group-containing monomer).
  • the (meth)acrylic polymer 8 is preferable because it contains a (meth)acrylic acid alkyl ester having an alkyl group having 2 to 20 carbon atoms as a monomer unit constituting the polymer. It can develop tackiness.
  • Alkyl group-containing (meth)acrylic acid alkyl esters having 2 to 20 carbon atoms are those having a glass transition temperature (C9) as a homopolymer of 140 ° C or less (hereinafter referred to as "low C9 alkyl acrylate"). ] Is preferred.) is preferred.
  • low-dose 9 alkyl acrylates examples include n-butyl acrylate (Ding 9-55 ° ⁇ ), acrylate octyl (Ding 9-65 ° ⁇ ), isooctyl acrylate (Ding 9- 58 ° ⁇ ), 2-ethylhexyl acrylate (Cho 9-70 ° ⁇ ), isononyl acrylate (Cho 9-58 ° ⁇ ), isodecyl acrylate (Cho 9-60 ° ⁇ , isodecyl methacrylate (Cho) Ding 9-4 1 ° ⁇ , methacrylic acid n ⁇ 2020/175089 1 1 ⁇ (: 170? 2020 /004752
  • the resulting et be pressure-sensitive adhesive layer
  • the homopolymer D is 9 as the low acrylate 9 alkyl acrylate, which is not more than 45°°. It is particularly preferably 50° C. or less.
  • -butyl acrylate and 2-ethylhexyl acrylate are particularly preferable. These may be used alone or
  • the (meth)acrylic polymer 8 preferably contains, as a lower limit, 85% by mass or more of a low-dose 9 alkyl acrylate as a monomer unit constituting the polymer. % Or more, and more preferably 95% by mass or more.
  • the obtained pressure-sensitive adhesive layer easily satisfies the relational expression (2) or the relational expression (3).
  • the (meth)acrylic polymer 8 preferably contains the above-mentioned low alkyl acrylate as a monomer unit constituting the polymer, and its upper limit is 99.9 mass% or less.
  • the content is more preferably 5 mass% or less, and further preferably 99 mass% or less.
  • the (meth)acrylic polymer 8 has a glass transition temperature (homopolymer) as a homopolymer in order to easily set the glass transition temperature (9) of the main polymer of the pressure-sensitive adhesive according to the present embodiment to the range described above. It is preferable to reduce the content of the monomer (C) 9) exceeding 0 ° (hereinafter sometimes referred to as “hard monomer”) as much as possible.
  • the (meth)acrylic polymer 8 preferably has a hard monomer content of not more than 15% by mass as an upper limit, and not more than 10% by mass, as a monomer unit constituting the polymer. Is better to ⁇ 2020/175089 12 ⁇ (: 170? 2020 /004752
  • the hard monomer also contains a reactive functional group-containing monomer described later.
  • Examples of the hard monomer such as methyl acrylate (sheets 9 1 0 ° ⁇ , methyl methacrylate (sheets 9 1 05 ° ⁇ , ethyl methacrylate (Ding 965 ° ⁇ ), methacrylic acid ⁇ -butyl (Ding 9 20° ⁇ ), isoptyl methacrylate (Cho 948° ⁇ , I-butyl methacrylate (Chain 9 07° ⁇ ), n-stearyl acrylate (Cha 9 30° ⁇ ), methacrylate-stearyl (Cha 9 38°) ⁇ ), Cyclohexyl acrylate (Cho 9 15 ° ⁇ ), Cyclohexyl methacrylate (C 966 ° ⁇ , Phenoxyethyl acrylate (Cha 9 5 ° ⁇ ), Phenoxyethyl methacrylate (Cha 9 54 ° ⁇ ), Methacrylic acid benzyl (Ding 9 54 ° ⁇ )
  • the (meth)acrylic polymer 8 contains a reactive functional group-containing monomer as a monomer unit constituting the polymer, so that the reactive functional group derived from the reactive functional group-containing monomer is Through a thermal crosslinking agent described later, thereby forming a crosslinked structure (three-dimensional network structure), and a pressure-sensitive adhesive having a desired cohesive force is obtained.
  • Examples of the reactive functional group-containing monomer contained in the (meth)acrylic polymer 8 as a monomer unit constituting the polymer include a monomer having a hydroxyl group in the molecule (a hydroxyl group-containing monomer), Preferable examples include a monomer having a carboxy group (carboxy group-containing monomer), a monomer having an amino group in the molecule (amino group-containing monomer), and the like. Of these, the hydroxyl group-containing monomer is particularly preferable because many of them have a glass transition temperature (Choose 9) of 0 ° or less. ⁇ 2020/175089 13 ⁇ (: 170? 2020 /004752
  • Examples of the hydroxyl group-containing monomer include (meth)acrylic acid 2-hydroxyethyl, (meth)acrylic acid 2-hydroxypropyl, (meth)acrylic acid 3-hydroxypropyl, and (meth)acrylic acid 2-hydroxybutyl. And (meth)acrylic acid hydroxyalkyl esters such as (meth)acrylic acid 3-hydroxybutyl and (meth)acrylic acid 4-hydroxybutyl.
  • 2-hydroxy acrylate is preferable because of its glass transition temperature (9), reactivity of the hydroxyl group in the resulting (meth)acrylic polymer with the thermal crosslinking agent, and copolymerizability with other monomers. It is preferably at least one of ethyl, 2-hydroxypropyl acrylate, 3-hydroxypropyl acrylate, and 4-hydroxybutyl acrylate. These may be used alone or in combination of two or more.
  • carboxy group-containing monomer examples include ethylenically unsaturated carboxylic acids such as acrylic acid, methacrylic acid, crotonic acid, maleic acid, itaconic acid, and citraconic acid. These may be used alone or in combination of two or more.
  • carboxylic acids such as acrylic acid, methacrylic acid, crotonic acid, maleic acid, itaconic acid, and citraconic acid. These may be used alone or in combination of two or more.
  • amino group-containing monomer examples include (meth)acrylic acid aminoethyl and (meth)acrylic acid butylaminoaminoethyl. These may be used alone or in combination of two or more.
  • the (meth)acrylic polymer 8 preferably contains a reactive functional group-containing monomer as a monomer unit constituting the polymer at a lower limit of 0.1% by mass or more, and particularly It is preferably contained in an amount of 5% by mass or more, more preferably 1% by mass or more. Further, the upper limit value is preferably not more than 10% by mass, more preferably not more than 8% by mass, and further preferably less than 5% by mass.
  • the (meth)acrylic polymer 8 contains as a monomer unit a reactive functional group-containing monomer, particularly a hydroxyl group-containing monomer, in the above-mentioned amount, the resulting pressure-sensitive adhesive layer satisfies relational expression (2) or relational expression (3). It will be easier.
  • the (meth)acrylic polymer 8 is composed of a monomer unit that constitutes the polymer. ⁇ 2020/175089 14 ⁇ (: 170? 2020 /004752
  • the carboxy group-containing monomer particularly acrylic acid which is also a hard monomer
  • the carboxy group is an acid component, it does not contain a carboxy group-containing monomer, so that the adhesive may cause problems with acid, such as a transparent conductive film such as tin-doped indium oxide ( ⁇ chome) or metal. Even when a film or metal mesh is present, it is possible to suppress their defects (corrosion, resistance value change, etc.) due to acid.
  • the (meth)acrylic polymer 8 may optionally contain another monomer as a monomer unit constituting the polymer.
  • a monomer that does not contain a reactive functional group is preferable because it does not hinder the action of the reactive functional group-containing monomer.
  • Such other monomers include, for example, (meth)acrylic acid alkoxyalkyl esters such as (meth)methacrylic acid acrylate and (meth)acrylic acid ethoxyethyl, as well as the glass transition temperature as a homopolymer (Claim 9).
  • Examples of the monomer include a monomer having a value of more than 40° and less than or equal to 0° (hereinafter, may be referred to as “Chacho 9 alkyl acrylate”).
  • Examples of 9-alkyl acrylates include ethyl acrylate (Ding 9 _ 20 ° ⁇ , isoptyl acrylate (Ding 9-26 ° ⁇ , 2-ethyl hexyl methacrylate (Ding 9-10 ° ⁇ ), Acrylic acid lauryl (Ding 9-2 3 ° ⁇ )
  • Isostearyl acrylate (Choose 9-18 ° C., etc. may be used singly or in combination of two or more kinds.
  • the polymerization mode of the (meth)acrylic polymer 8 may be a random copolymer or a block copolymer.
  • the lower limit of the weight average molecular weight of the (meth)acrylic polymer is preferably 200,000 or more, particularly preferably 300,000 or more, and further preferably 400,000 or more. .. If the lower limit of the weight average molecular weight of the (meth)acrylic polymer 8 is at least the above, problems such as leaching of the adhesive will be suppressed.
  • the weight average molecular weight in this specification is the value of standard polystyrene conversion measured by the gel permeation chromatography (OO) method. ⁇ 2020/175089 15 ⁇ (: 170? 2020 /004752
  • the upper limit of the weight average molecular weight of the (meth)acrylic polymer 8 is 15
  • one type of (meth)acrylic polymer 8 may be used alone, or two or more types may be used in combination.
  • the thermal crosslinking agent crosslinks the (meth)acryl-based polymer 8 to form a three-dimensional network structure. This improves the cohesive force of the obtained pressure-sensitive adhesive and makes it easier to satisfy the relational expression (2) or the relational expression (3) for the obtained pressure-sensitive adhesive layer.
  • the thermal cross-linking agent may be any as long as it reacts with the reactive group of the (meth)acrylic polymer 8, and examples thereof include an isocyanate cross-linking agent, an epoxy cross-linking agent, an amine cross-linking agent, and a melamine-based Cross-linking agent, aziridine-based cross-linking agent, hydrazine-based cross-linking agent, aldehyde-based cross-linking agent, oxazoline-based cross-linking agent, metal alkoxide-based cross-linking agent, metal chelate-based cross-linking agent, metal salt-based cross-linking agent, ammonium salt-based cross-linking agent Etc.
  • the reactive group of the (meth)acrylic polymer 8 is a hydroxyl group
  • the thermal crosslinking agents may be used alone or in combination of two or more.
  • the isocyanate crosslinking agent contains at least a polyisocyanate compound.
  • polyisocyanate compound examples include aromatic polyisocyanates such as tolylene diisocyanate, diphenylmethane diisocyanate, and xylylene diisocyanate, aliphatic polyisocyanates such as hexamethylene diisocyanate, and oils such as isophorone diisocyanate and hydrogenated diphenylmethane diisocyanate. Cyclic polyisocyanates, etc., and their polyurets, isocyanurates, ethylene glycol, propylene glycol, etc. ⁇ 2020/175089 16 ⁇ (: 170? 2020 /004752
  • Examples thereof include adducts, which are reaction products with low molecular weight active hydrogen-containing compounds such as coal, neopentyl glycol, trimethylolpropane, and castor oil.
  • adducts which are reaction products with low molecular weight active hydrogen-containing compounds such as coal, neopentyl glycol, trimethylolpropane, and castor oil.
  • trimethylolpropane-modified aromatic polyisocyanate particularly trimethylolpropane-modified tolylene diisocyanate and trimethylolpropane-modified xylylene diisocyanate are preferable from the viewpoint of reactivity with a hydroxyl group.
  • Examples of the epoxy-based cross-linking agent include 1,3-bis (1 ⁇ 1, 1 ⁇ 1-diglycidylaminomethyl) cyclohexane, 1 ⁇ 1, 1 ⁇ 1, 1 ⁇ 1', 1 ⁇ 1'-tetra
  • Examples thereof include glycidyl xylylenediamine, ethylene glycol diglycidyl ether, 1,6-hexanediol diglycidyl ether, trimethylolpropane diglycidyl ether, diglycidylaniline, diglycidylamine and the like.
  • the content of the thermal crosslinking agent in the pressure-sensitive adhesive composition is preferably 0.01% by mass or more based on 100% by mass of the (meth)acrylic polymer, and 0.0
  • the content is more preferably 5% by mass or more, and further preferably 0.1% by mass or more.
  • the content is preferably 1 mass% or less, more preferably 0.8 mass% or less, and further preferably 0.5 mass% or less.
  • the pressure-sensitive adhesive composition preferably contains the above-mentioned silane coupling agent.
  • the obtained pressure-sensitive adhesive layer has improved adhesiveness with each member in the flexible laminate which is the adherend, and has more excellent durability against bending.
  • the silane coupling agent is an organosilicon compound having at least one alkoxysilyl group in the molecule, which has good compatibility with the (meth)acrylic polymer 8 and has light transmittance. Is preferred.
  • silane coupling agent examples include vinyltrimethoxysilane, vinyltriethoxysilane, methacryloxypropyltrimethoxysilane, and the like. ⁇ 2020/175089 17 ⁇ (: 170? 2020/004752
  • Polymerizable unsaturated group-containing silicon compound 3-glycidoxypropyltrimethoxysilane, 2-(3,4-epoxycyclohexyl) silicon compound having an epoxy structure such as ethyltrimethyoxysilane, 3-mercaptopropyltrimethoxysilane, 3— Mercapto group-containing silicon compounds such as mercaptopropyltriethoxysilane, 3-mercaptopropyldimethoxymethylsilane, 3-aminopropyltrimethoxysilane, 1 ⁇ 1—(2-aminoethyl)-13-aminopropyltrimethoxysilane, 1 ⁇ 1 — (2-Aminoethyl)-amino group-containing silicon compounds such as 3-aminopropylmethyldimethoxysilane, 3-chloropropyltrimethoxysilane, 3-isocyanatopropyltriethoxysilane, or at least one of these, and methyltrie
  • the content of the silane coupling agent in the pressure-sensitive adhesive composition is preferably 0.01% by mass or more based on 100% by mass of the (meth)acryl-based polymer. It is more preferably at least 0.5% by mass, further preferably at least 0.1% by mass. Further, the content is preferably 1% by mass or less, more preferably 0.5% by mass or less, and further preferably 0.3% by mass or less. When the content of the silane coupling agent is within the above range, the obtained pressure-sensitive adhesive layer has more preferable adhesiveness to each member in the flexible laminated body which is an adherend.
  • the (meth)acrylic polymer 8 can be produced by polymerizing a mixture of monomers constituting the polymer by an ordinary radical polymerization method.
  • the polymerization of the (meth)acrylic polymer is carried out by using a polymerization initiator if desired, ⁇ 2020/175089 18 ⁇ (: 170? 2020 /004752
  • the polymerization solvent include ethyl acetate, 1 ⁇ !-butyl acetate, isoptyl acetate, toluene, acetone, hexane, and methyl ethyl ketone, and two or more kinds may be used in combination.
  • Examples of the polymerization initiator include azo compounds and organic peroxides, and two or more kinds may be used in combination.
  • Examples of the azo compound include 2,2'-azobisisoptyronitrile and 2,2'-azobis(2-methylptyronitrile).
  • organic peroxides examples include benzoyl peroxide, 1-butyl perbenzoate, cumene hydroperoxide, diisopropyl peroxydicarbonate, di _ _ _ propyl peroxydicarbonate, di(2-ethoxy ether).
  • Tyl) peroxydicarbonate I _ butylperoxyneodecanoate, 1-butylperoxybivalate, (3, 5, 5, 5-trimethylhexanoyl) peroxide, dipropionyl peroxide, diacetyl peroxide, etc.
  • the weight average molecular weight of the obtained polymer can be adjusted by blending a chain transfer agent such as 2-mercaptoethanol.
  • the components when precipitation occurs when mixed with other components in an undiluted state, the components may be dissolved or diluted in advance in a diluting solvent alone and then mixed with other components.
  • the diluent solvent examples include aliphatic hydrocarbons such as hexane, heptane and cyclohexane, aromatic hydrocarbons such as toluene and xylene, halogenated hydrocarbons such as methylene chloride and ethylene chloride, methanol, ethanol and propanal.
  • Butanol alcohol such as 1-methoxy_2-propanol, acetone, methyl ethyl ketone, 2-pentanone, isophorone, ketone such as cyclohexanone, ester such as ethyl acetate, butyl acetate, cellosolve such as ethyl cellosolve A solvent or the like is used.
  • the concentration/viscosity of the coating solution thus prepared may be within a coatable range and is not particularly limited and may be appropriately selected depending on the situation.
  • the pressure-sensitive adhesive composition 8 is diluted to a concentration of 10 to 60% by mass.
  • the addition of a diluent solvent or the like is not a necessary condition, and the diluent solvent may not be added as long as the pressure-sensitive adhesive composition has a coatable viscosity.
  • the pressure-sensitive adhesive composition 8 is a coating solution using the (meth)acrylic polymer polymerization solvent as a diluting solvent.
  • the preferable pressure-sensitive adhesive as the pressure-sensitive adhesive according to the present embodiment is one obtained by crosslinking the pressure-sensitive adhesive composition.
  • the pressure-sensitive adhesive composition 8 can be crosslinked by heat treatment.
  • the heat treatment can also be used as a drying treatment when the diluent solvent or the like is volatilized from the coating film of the pressure-sensitive adhesive composition 8 applied to a desired object.
  • the heating temperature of the heat treatment is preferably from 50 to 150°, and from 70 to 1
  • the heating time is preferably 10 seconds to 10 minutes, more preferably 50 seconds to 2 minutes.
  • a curing period of about 2 weeks may be provided. If this curing period is required, after the curing period has elapsed, if the curing period is not required, the adhesive will be formed after the heat treatment is completed. ⁇ 2020/175089 20 boxes (: 170? 2020 /004752
  • the (meth)acrylic polymer is sufficiently crosslinked through the crosslinking agent to form a crosslinked structure, and the pressure-sensitive adhesive is obtained.
  • a pressure-sensitive adhesive it becomes easy to satisfy the relational expression (2) or the relational expression (3) for the obtained pressure-sensitive adhesive layer.
  • a pressure-sensitive adhesive sheet according to the present invention includes a pressure-sensitive adhesive layer formed from the above-mentioned pressure-sensitive adhesive composition according to the present invention.
  • the pressure-sensitive adhesive layer can be formed by applying the pressure-sensitive adhesive composition onto a substrate.
  • the formed pressure-sensitive adhesive layer may be subjected to heat treatment (and curing) to obtain a cured product having a desired degree of curing. it can.
  • the heat treatment and curing conditions are as described above.
  • the base material may be a release film that has been subjected to a release treatment.
  • the pressure-sensitive adhesive sheet can be prepared by forming a layer made of a pressure-sensitive adhesive in a sheet shape on a release film, and further laminating another release film on the pressure-sensitive adhesive layer.
  • a method of applying the coating liquid of the pressure-sensitive adhesive composition for example, a bar coating method, a knife coating method, a mouth coating method, a blade coating method, a die coating method, a gravure coating method and the like can be used.
  • the pressure-sensitive adhesive composition can be produced by a known method, for example, by collectively mixing the components using a mixer or the like.
  • the front plate 101 is not limited in material and thickness as long as it is a plate that can transmit light, and may be composed of only one layer, or may be composed of two or more layers. .. Examples thereof include a resin plate (for example, a resin plate, a resin sheet, a resin film, etc.), a glass plate (for example, a glass plate, a glass film, etc.), and a touch sensor panel described later.
  • the front plate may constitute the outermost surface of the display device.
  • the thickness of the front plate 101 may be, for example, 10 or more and 500 or less, preferably 30 or more and 200 or less, and more preferably 50 or more and 100 or less. In the present invention, the thickness of each layer is as described below. ⁇ 2020/175089 21 ⁇ (: 170? 2020 /004752
  • the resin plate is not limited as long as it can transmit light.
  • the resin that constitutes the resin-made plate-shaped body such as a resin film
  • the resin that constitutes the resin-made plate-shaped body such as a resin film
  • the front plate 101 is preferably a film in which a hard coat layer is provided on at least one surface of the base film from the viewpoint of increasing hardness.
  • a film made of the above resin can be used as the substrate film.
  • the hard coating layer may be formed on one surface of the substrate film, or may be formed on both surfaces.
  • the hard coat layer is, for example, a cured layer of an ultraviolet curable resin.
  • the ultraviolet curable resin include acrylic resin, silicone resin, polyester resin, urethane resin, amide resin, and epoxy resin.
  • the hard coat layer may contain an additive in order to improve hardness.
  • the additive is not limited, and may be inorganic fine particles, organic fine particles, or a mixture thereof. ⁇ 2020/175089 22 ⁇ (: 170? 2020 /004752
  • the front plate 101 is a glass plate
  • a reinforced glass for display is preferably used as the glass plate.
  • the thickness of the glass plate may be, for example, 10 or more and 1,00 or less.
  • the front plate 1101 has not only a function of protecting the front surface (screen) of the display device (function as a window film) but also a touch sensor. Function, blue light cut function, viewing angle adjustment function, and the like.
  • the first pressure-sensitive adhesive layer 102 is a layer which is interposed between the front plate 10 1 and the polarizer layer 10 3 to bond them together.
  • a layer formed of a pressure-sensitive adhesive or an adhesive or It may be a layer obtained by subjecting the layer to some treatment.
  • the first pressure-sensitive adhesive layer may be a pressure-sensitive adhesive layer that is arranged at a position closest to the front plate among the pressure-sensitive adhesive layers that form the laminate.
  • Adhesives are also called pressure sensitive adhesives. In the present specification, the “adhesive” refers to an adhesive other than a pressure-sensitive adhesive (pressure-sensitive adhesive) and is clearly distinguished from the pressure-sensitive adhesive.
  • the first pressure-sensitive adhesive layer 102 may be composed of one layer, or may be composed of two or more layers, but is preferably one layer.
  • the first pressure-sensitive adhesive layer 20 can be formed directly from the pressure-sensitive adhesive composition or by using a pressure-sensitive adhesive sheet having a pressure-sensitive adhesive layer formed using the pressure-sensitive adhesive composition.
  • the pressure-sensitive adhesive composition can be formed from the pressure-sensitive adhesive composition as described above.
  • the thickness of the first pressure-sensitive adhesive layer 102 is, for example, preferably 3 or more and 100 or less, more preferably 5 or more and 50 or less, and may be 2001 or more.
  • polarizer layer 103 a stretched film or a stretched layer having a dichroic dye adsorbed thereon, a layer obtained by coating and curing a composition containing a dichroic dye and a polymerizable compound.
  • dichroic dyes include iodine and dichroic organic dyes.
  • dichroic organic dyes there are ⁇ . ⁇ .0 ⁇ 3
  • Dichroic direct dyes composed of disazo compounds such as 9 and dichroic direct dyes composed of compounds such as trisazo and tetrakisazo are included.
  • the polarizer layer obtained by applying and curing a composition containing a dichroic dye and a polymerizable compound includes a composition containing a dichroic dye having liquid crystallinity or a dichroic dye and a superimposing liquid crystal.
  • a polarizer layer containing a cured product of a polymerizable liquid crystal compound such as a layer obtained by applying and curing a composition containing
  • a polarizer layer obtained by coating and curing a composition containing a dichroic dye and a polymerizable compound is preferable as compared with a stretched film or stretched layer on which a dichroic dye is adsorbed, because the bending direction is not limited. ..
  • the polarizer layer which is a stretched film with a dichroic dye adsorbed, is usually produced by the process of uniaxially stretching a polyvinyl alcohol-based resin film, and by diluting the polyvinyl alcohol-based resin film with a dichroic dye It can be manufactured through a step of adsorbing a chromogenic dye, a step of treating a polyvinyl alcohol-based resin film on which a dichroic pigment is adsorbed with a boric acid aqueous solution, and a step of rinsing with water after the treatment with the boric acid aqueous solution.
  • the thickness of the polarizer layer 103 is, for example, 2 or more and 40 or less.
  • the thickness of the polarizer layer 103 may be 5 or more, and may be 200! or less, further 15 or less, and still further 10 or less.
  • the polyvinyl alcohol-based resin is obtained by saponifying a polyvinyl acetate-based resin.
  • a polyvinyl acetate-based resin in addition to polyvinyl acetate, which is a homopolymer of vinyl acetate, a copolymer of vinyl acetate and another monomer that can be copolymerized with it is used.
  • Other monomers copolymerizable with vinyl acetate include, for example, unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic acids, and (meth)acrylic amides having an ammonium group. .. ⁇ 2020/175089 24 ⁇ (: 170? 2020 /004752
  • the saponification degree of the polyvinyl alcohol resin is usually about 85 mol% or more and 100 mol% or less, and preferably 98 mol% or more.
  • the polyvinyl alcohol-based resin may be modified, and for example, polyvinyl formal modified with aldehydes or polyvinyl acetal may be used.
  • the degree of polymerization of the polyvinyl alcohol-based resin is usually 1,00 0 or more and 10 0,0 0 0 or less, preferably 1,500 0 or more and 5 0 0 0 or less.
  • the dichroic polarizer layer dye is a stretched layer was adsorbed, usually, a step of applying a coating solution containing the polyvinyl alcohol-based resin on the substrate film, the resulting laminated film _ biaxially stretched Process, _
  • the film can be manufactured through a step of treating the formed film with a boric acid aqueous solution, and a step of washing with water after the treatment with the boric acid aqueous solution.
  • the base film may be peeled and removed from the polarizer layer.
  • the material and thickness of the base film may be the same as the material and thickness of the thermoplastic resin film described later.
  • the polarizer layer which is a stretched film or a stretched layer may be incorporated in a laminate in a form in which a thermoplastic resin film is attached to one side or both sides thereof.
  • This thermoplastic resin film can function as a protective film for the polarizer layer 103 or a retardation film.
  • the thermoplastic resin film is, for example, a polyolefin resin such as a chain polyolefin resin (such as polypropylene resin) or a cyclic polyolefin resin (such as norbornene resin); a cellulose resin such as triacetylcellulose; polyethylene terephthalate;
  • the film may be a polyester resin such as polyethylene naphthalate or polyethylene terephthalate; a polycarbonate resin; a (meth)acrylic resin; or a mixture thereof.
  • the thickness of the thermoplastic resin film is usually 300 or less, preferably 200 or less, and more preferably 100 or less from the viewpoint of thinning. ⁇ 2020/175089 25 ⁇ (: 170? 2020 /004752
  • thermoplastic resin film may or may not have a retardation.
  • thermoplastic resin film can be attached to the polarizer layer 103 using an adhesive layer, for example.
  • the polarizer layer formed by coating and curing a composition containing a dichroic dye and a polymerizable compound includes a composition containing a polymerizable dichroic dye having liquid crystallinity or a dichroic dye and a polymerizable liquid crystal.
  • a polarizer layer containing a cured product of a polymerizable liquid crystal compound such as a layer obtained by applying a composition containing the composition to a substrate film and curing the composition.
  • the base film may be peeled off from the polarizer layer.
  • the material and thickness of the base film may be the same as the material and thickness of the thermoplastic resin film described above.
  • the polarizer layer may include an alignment film. The alignment film may be peeled off.
  • a polarizer layer obtained by coating and curing a composition containing a dichroic dye and a polymerizable compound is incorporated in an optical laminate in a form in which a thermoplastic resin film is attached to one side or both sides of the polarizer layer. May be.
  • a thermoplastic resin film the same thermoplastic resin film that can be used for the stretched film or the polarizer layer that is the stretched layer can be used.
  • the thermoplastic resin film can be attached to the polarizer layer using, for example, an adhesive layer.
  • a polarizer layer obtained by applying and curing a composition containing a dichroic dye and a polymerizable compound may have a bar coat ( ⁇ layer as a protective layer) formed on one or both surfaces thereof.
  • the photocurable resin include water-soluble polymers, etc.
  • the photocurable resin include (meth)acrylic resin, urethane resin, (meth)acrylic urethane resin, epoxy resin, and silicone resin.
  • water-soluble polymers include poly(meth)acrylic amide-based polymers. ⁇ 2020/175089 26 ⁇ (: 170? 2020 /004752
  • the thickness of the XX layer is preferably 20 or less, more preferably 15 or less, still more preferably 10 or less, and may be 5 or less. .05 or more, and may be 0.50! or more.
  • the thickness of the polarizer layer formed by coating and curing a composition containing a dichroic dye and a polymerizable compound is usually 10 or less, preferably 0.5 or more and 81 0 or less, It is more preferably 1 or more and 5 or less.
  • the second pressure-sensitive adhesive layer 104 is a pressure-sensitive adhesive layer arranged between the polarizer layer 103 and the back plate 105.
  • the second pressure-sensitive adhesive layer can be a pressure-sensitive adhesive layer that is disposed closest to the back plate among the pressure-sensitive adhesive layers that form the laminate.
  • the second pressure-sensitive adhesive layer 104 may be one layer, or may be composed of two or more layers, but is preferably one layer.
  • composition and blending components of the pressure-sensitive adhesive composition constituting the second pressure-sensitive adhesive layer 104, type of pressure-sensitive adhesive composition (whether or not it is an active energy ray-curable type or a thermosetting type), a pressure-sensitive adhesive The additive that can be incorporated into the composition, the method for producing the second pressure-sensitive adhesive layer, and the thickness of the second pressure-sensitive adhesive layer are the same as those described in the description of the first pressure-sensitive adhesive layer 102 above. ..
  • the second pressure-sensitive adhesive layer 104 may be the same as or different from the first pressure-sensitive adhesive layer 102 in terms of composition, compounding components, thickness, etc. of the pressure-sensitive adhesive composition.
  • the back plate 105 it is possible to use a plate that can transmit light, a component used in a normal display device, or the like.
  • the thickness of the back plate 105 should be, for example, 5 or more and 2, 00 or less. ⁇ 2020/175089 27 ⁇ (: 170? 2020 /004752
  • It is preferably 10 or more and 1,00,000 or less, more preferably 15 or more and 500,000 or less.
  • the plate-shaped body used for the back plate 105 may be composed of only one layer, or may be composed of two or more layers. What was illustrated can be used.
  • Examples of components used in a normal display device used for the back plate 105 include a separator, a touch sensor panel, an organic semiconductor display element, and the like.
  • the stacking order of the components in the display device is, for example, front plate/circular polarizing plate/separator, front plate/circular polarizing plate/organic solar panel display device, front plate/circular polarizing plate/touch sensor panel/organic mirror. !_ Display element, front panel/touch sensor panel/circular polarizing plate/organic mirror!
  • the detection method is not limited, and a resistance film method, a capacitive coupling method, an optical sensor method, an ultrasonic method, an electromagnetic induction method.
  • a touch sensor panel such as a coupling type or a surface acoustic wave type. Because of its low cost, a resistive film type or electrostatic capacity coupling type touch sensor panel is preferably used.
  • [01 12] _ Examples of the touch sensor panel of resistive film type, and the substrate _ pairs which face each other, and the clamping has been insulating spacer therebetween pair of substrates, the front of the inner of each substrate And a touch position detection circuit.
  • a touch position detection circuit In an image display device provided with a resistive film type touch sensor panel, when the surface of the front plate is touched, the opposing resistive films are short-circuited and a current flows through the resistive film.
  • the touch position detection circuit detects the voltage change at this time, and the touched position is detected.
  • An example of a capacitive coupling type touch sensor panel includes a substrate, a transparent electrode for position detection provided on the entire surface of the substrate, and a touch position detection circuit.
  • a capacitive coupling type touch sensor panel when the surface of the front plate is touched, the capacitance of the human body is measured at the touched point. ⁇ 2020/175089 28 ⁇ (: 170? 2020 /004752
  • the transparent electrode is grounded through.
  • the touch position detection circuit detects the grounding of the transparent electrode, and the touched position is detected.
  • the thickness of the touch sensor panel may be, for example, 5 or more and 2,00 or less, or may be 50! or more and 100 or less.
  • the laminated body 100 can further include one layer or two or more retardation layers.
  • the retardation layer is usually arranged between the polarizer layer 103 and the back plate 105.
  • the phase difference layer includes the first pressure-sensitive adhesive layer 102, the second pressure-sensitive adhesive layer 104, or a layer composed of a pressure-sensitive adhesive or an adhesive other than these layers (hereinafter, also referred to as a bonding layer). Can be laminated on other layers (including other retardation layers).
  • the laminating layer is a layer arranged between the first pressure-sensitive adhesive layer 102 and the second pressure-sensitive adhesive layer 104, and is a layer composed of a pressure-sensitive adhesive or an adhesive.
  • the adhesive constituting the laminating layer may be the same agent as exemplified for the pressure-sensitive adhesive composition constituting the first pressure-sensitive adhesive layer 102 or the second pressure-sensitive adhesive layer, or other Adhesives such as (meth)acrylic adhesives, styrene adhesives, silicone adhesives, rubber adhesives, urethane adhesives, polyester adhesives, epoxy copolymer adhesives, etc. Good.
  • the adhesive constituting the bonding layer for example, one or two or more of water-based adhesives, active energy ray-curable adhesives, adhesives and the like can be formed in combination.
  • the water-based adhesive include an aqueous solution of polyvinyl alcohol-based resin and a water-based two-component urethane-based emulsion adhesive.
  • the active energy ray-curable adhesive is an adhesive that is cured by irradiation with active energy rays such as ultraviolet rays, for example, one containing a polymerizable compound and a photopolymerizable initiator, one containing a photoreactive resin. Examples thereof include those containing a binder resin and a photoreactive crosslinking agent.
  • Examples of the polymerizable compound include photopolymerizable monomers such as photocurable epoxy-based monomers, photocurable acrylic-based monomers, and photocurable urethane-based monomers, and the derivatives derived from these monomers. ⁇ 2020/175089 29 ⁇ (: 170? 2020 /004752
  • the photopolymerization initiator examples include those containing a substance that emits an active energy ray such as a neutral radical, anion radical or cation radical upon irradiation with an active energy ray such as ultraviolet rays.
  • the thickness of the bonding layer may be, for example, 1 or more, and preferably 1 or more.
  • It is 25 or less, more preferably 2 or more and 15 or less, still more preferably 2.5 or more and 5 or less.
  • the laminate 200 shown in Fig. 2 includes a front plate 101, a first pressure-sensitive adhesive layer 102, a polarizer layer 103, a bonding layer 108 and a back plate 105.
  • the first retardation layer 106, the laminating layer 109, the second retardation layer 107, and the second pressure-sensitive adhesive layer 104 are further provided.
  • Examples of the retardation layer include positive eight plates such as S/4 plate and S/2 plate, and positive O plate.
  • the retardation layer may be, for example, a retardation film that can be formed from the above-mentioned thermoplastic resin film, or a layer formed by curing a polymerizable liquid crystal compound, that is, a cured product of the polymerizable liquid crystal compound.
  • the layer may be included, but the latter is preferable.
  • the thickness of the retardation film may be the same as the thickness of the thermoplastic resin film described above.
  • the thickness of the retardation layer formed by curing the polymerizable liquid crystal compound is, for example, 0. 1 0 1 or more and 10 or less, preferably 0. 5 0! or more and 8 0! or less, and more preferably 1 or more. It is less than 60!
  • the retardation layer formed by curing the polymerizable liquid crystal compound can be formed by applying a composition containing the polymerizable liquid crystal compound onto a substrate film and curing the composition.
  • An alignment layer may be formed between the base film and the coating layer.
  • the material and thickness of the base film may be the same as the material and thickness of the thermoplastic resin film described above.
  • the retardation layer formed by curing the polymerizable liquid crystal compound may be incorporated in the laminate 100 in a form having an alignment layer and/or a base film.
  • the back plate 105 may be a base film to which the above composition is applied. ⁇ 2020/175089 30 units (: 170? 2020 /004752
  • the bonding layer 108 may use a pressure-sensitive adhesive or an adhesive.
  • This adhesive may be the adhesive composition described above.
  • a water-based adhesive or an active energy ray-curable adhesive can be used as the adhesive.
  • the water-based adhesive include an adhesive composed of a polyvinyl alcohol-based resin aqueous solution and a water-based two-component urethane-based emulsion adhesive.
  • An active energy ray-curable adhesive refers to an adhesive that cures when irradiated with an active energy ray such as ultraviolet rays.
  • an adhesive containing a polymerizable compound and a photopolymerization initiator or a photoreactive resin is used. Examples thereof include those containing a binder resin and a photoreactive crosslinking agent.
  • Examples of the polymerizable compound include photopolymerizable monomers such as photocurable epoxy monomers, photocurable (meth)acrylic monomers, and photocurable urethane monomers, and oligomers derived from photopolymerizable monomers.
  • photopolymerizable monomers such as photocurable epoxy monomers, photocurable (meth)acrylic monomers, and photocurable urethane monomers, and oligomers derived from photopolymerizable monomers.
  • the photopolymerization initiator examples include those containing substances that generate active species such as neutral radicals, anion radicals, and cation radicals upon irradiation with active energy rays such as ultraviolet rays.
  • active energy ray-curable adhesive containing a polymerizable compound and a photopolymerization initiator those containing a photocurable epoxy monomer and a photocation polymerization initiator can be preferably used.
  • the layered product 100 can be produced by a method including a step of laminating the layers constituting the layered product 100 with a pressure-sensitive adhesive layer or an adhesive layer therebetween.
  • a step of laminating the layers via the pressure-sensitive adhesive layer or the adhesive layer one or both of the bonding surfaces should be subjected to surface activation treatment such as corona treatment in order to enhance the adhesiveness. It is preferable to apply.
  • the polarizer layer 103 can be directly formed on the thermoplastic resin film or the base film, and the thermoplastic resin film or the base film may be incorporated in the laminate 100. Alternatively, it may not be peeled from the polarizer layer 103 and become a constituent element of the laminate. ⁇ 2020/175089 31 ⁇ (: 170? 2020 /004752
  • a display device includes the layered product 100 according to the present invention.
  • the display device is not particularly limited, and examples thereof include an image display device such as an organic display device, an inorganic display device, a liquid crystal display device, and an electroluminescent display device.
  • the display device may have a touch panel function.
  • the optical layered body is suitable for a flexible display device that can be bent or folded.
  • the optical laminate is arranged on the viewing side of the display element included in the display device with the front plate facing outward (the side opposite to the display element side, that is, the viewing side).
  • the display device can be used as a smartphone, a mobile device such as a tablet, a television, a digital photo frame, an electronic signboard, a measuring instrument or measuring instrument, an office device, a medical device, a computer device, or the like. it can.
  • the pressure-sensitive adhesive composition according to the present invention is preferably the pressure-sensitive adhesive composition described above.
  • the pressure-sensitive adhesive composition according to the present invention can be produced by a known method, for example, by collectively mixing the components using a mixer or the like.
  • the pressure-sensitive adhesive sheet according to the present invention preferably includes a pressure-sensitive adhesive layer formed from the pressure-sensitive adhesive composition.
  • the pressure-sensitive adhesive layer can be formed by applying the pressure-sensitive adhesive composition onto a substrate.
  • an active energy ray-curable pressure-sensitive adhesive composition is used as the pressure-sensitive adhesive composition
  • the formed pressure-sensitive adhesive layer can be irradiated with an active energy ray to obtain a cured product having a desired degree of curing. ..
  • a thermosetting pressure sensitive adhesive composition is used as the pressure sensitive adhesive composition
  • the formed pressure sensitive adhesive layer is subjected to heat treatment (and curing) to obtain a cured product having a desired degree of curing. You can
  • the base material may be a release film that has been subjected to a release treatment.
  • the pressure-sensitive adhesive sheet can be prepared by forming a layer made of a pressure-sensitive adhesive in a sheet shape on a release film, and further laminating another release film on the pressure-sensitive adhesive layer. ⁇ 2020/175089 32 ⁇ (: 170? 2020 /004752
  • the pressure-sensitive adhesive layer of the pressure-sensitive adhesive sheet according to the present invention has excellent adhesive durability in a normal temperature environment. Formed by the pressure-sensitive adhesive composition used for forming the pressure-sensitive adhesive layer, thickness
  • (Metal) Acrylic polymer was prepared by copolymerizing 54 parts by mass of butyl acrylate, 45 parts by mass of 2-ethylhexyl acrylate and 1 part by mass of 4-hydroxybutyl acrylate.
  • the weight average molecular weight (! ⁇ /! %) was 800,000.
  • the coating solution of the obtained pressure-sensitive adhesive composition was applied to the release-treated surface of a light separator (manufactured by Lintec Co., Ltd., product name “3 Ichimitsucho 752 150”) with a knife coater. Then, the coating layer was heated at 90 ° for 1 minute to form the coating layer. Then, the coating layer on the light separator obtained above and the heavy separator (manufactured by Lintec Co., Ltd., product name “3 Ichimitsu 382 1 20”) are brought into contact with the coating layer on the release treated surface of the separator.
  • Adhesive sheet with a thickness of 25 adhesive layer 81 that is, a light separator/adhesive, by curing the adhesive sheet at 23 ° ⁇ , 50% [3 ⁇ 4 1 to 1 for 7 days.
  • a pressure-sensitive adhesive sheet 8 1 1 composed of a layer (thickness: 25)/heavy separator was prepared.
  • the adhesive layer of the adhesive sheet 8 1 1 will be referred to as the adhesive layer 8 1 1.
  • Table 1 shows the measured shear creep rate for PSA sheet 81.
  • the thickness and shear creep rate of the pressure-sensitive adhesive layer 811 are values measured by the method described below.
  • a coating solution of the pressure-sensitive adhesive composition was obtained by diluting with ethyl ketone.
  • pressure-sensitive adhesive sheets 8 12 to 8 16 were produced in the same manner as in the production process of pressure-sensitive adhesive sheet 11.
  • the pressure-sensitive adhesive layers of the pressure-sensitive adhesive sheets 8 12 to 8 16 are referred to as pressure-sensitive adhesive layers 8 12 to 8 16.
  • Table 1 shows the thickness and shear creep rate of the pressure-sensitive adhesive layers 12 to 16 measured by the method described later for the pressure-sensitive adhesive sheets 8 12 to 8 16.
  • Monomer mixture consisting of 4% by mass, butyl acrylate (Nachihachi) monomer 2% by mass, 2-hydroxyethyl acrylate (2_1 to 1Nachihachi) monomer ⁇ 0.5% by mass, lauryl acrylate (!_8) monomer 6% by mass
  • nitrogen gas was refluxed for 1 hour and maintained at 80 ° C.
  • 0.05% by mass of the photopolymerization initiator benzyl dimethyl ketal (1 65 1) and 1-hydroxycyclohexylphenyl ketone (1 1 84) 0. 05% by mass were added. I put it in. Then, with stirring,
  • Irradiation with II V lamp (10) produced a (meth)acrylic polymer 8 2 1 having a weight average molecular weight (IV! of 380,000.
  • Table 2 shows the ratio of each monomer and each component of the acrylic polymer 8 21. ⁇ 2020/175089 35 ⁇ (: 170? 2020 /004752
  • E HA 2— Ethylhexyl acrylate (Tokyo Chemical Industry Co., Ltd., Japan),
  • a A Acrylic acid (Tokyo Chemical Industry Co., Ltd., Japan),
  • I — 1 84 1 — Hydroxycyclohexyl phenyl ketone (photoinitiator, BASF, Germany).
  • the coating solution of the obtained pressure-sensitive adhesive composition was applied to the release treated surface of a light separator (polyethylene terephthalate film, thickness 38) with a knife coater.
  • a heavy separator polyethylene terephthalate film, thickness 380 1
  • the adhesive layer of the adhesive sheet 21 is referred to as the adhesive layer 21.
  • Table 3 shows the measured shear creep rates for adhesive sheet 21.
  • the thickness and the shear creep rate of the pressure-sensitive adhesive layer 8 21 are the values measured by the method described below.
  • the (meth)acrylic polymer obtained in the above step and the additive were mixed in the mixing ratio shown in Table 3, stirred sufficiently, and diluted with methyl ethyl ketone to prepare a coating solution of the adhesive composition. Obtained.
  • pressure-sensitive adhesive sheets 8-22 to 8-24 were produced in the same manner as in the production process of pressure-sensitive adhesive sheet 21.
  • the pressure-sensitive adhesive layers of the pressure-sensitive adhesive sheets 8 2 to 8 24 are referred to as pressure-sensitive adhesive layers 8 22 to 8 24.
  • Table 3 shows the thickness and shear creep rate of the pressure-sensitive adhesive layers 22 to 24 measured by the method described later for the pressure-sensitive adhesive sheets 8 to 22.
  • the (meth)acrylic polymer to be measured was dissolved in tetrahydrofuran at a concentration of about 0.05% by mass, and then injected at 3 m (10 at 3). The mobile phase flowed at a flow rate of 1.0 1-/min.
  • 1_96 6 IV! ⁇ X _ 0 _ _ (made by Polymer Laboratories) was used.
  • I 3 detector (trade name Was used.
  • the shear creep rate was measured using a viscoelasticity measuring device (MCR-301, Anton Paa “Sha.”)
  • the adhesive sheet was cut into a width of 20 mm and a length of 20 mm, the release film was peeled off, and the thickness was measured. And laminated to a glass plate so that the measured value is 200 Mm.Measured under the conditions of Norma I force 1 N and Torque 1 200 N m at a temperature of 25 °C while being bonded to the measurement chip. Then, the shear deformation amount value (shear creep rate) at 1200 seconds was measured.
  • a polyimide film (thickness 50yu_m) having a hard coat layer (thickness of 10 Mm) on one side was prepared.
  • Polymer 1 having a photoreactive group consisting of the following structural units was prepared.
  • composition ( ⁇ _1) A solution prepared by dissolving Polymer 1 in cyclopentanone at a concentration of 5 mass% was used as a composition for forming an alignment film [hereinafter, also referred to as composition ( ⁇ _1)].
  • the polymerizable liquid crystal compound is a polymerizable liquid crystal compound represented by the formula (1 _ 1) [hereinafter, ⁇ 2020/175089 39 ⁇ (: 170? 2020 /004752
  • the dichroic dye has the following formula The azo dyes described in Examples of JP-A No. 20 1 3 -1 0 1 328 represented by (2-113) and (2-33) were used.
  • composition (8_1) A composition for forming a polarizer layer [hereinafter, also referred to as composition (8_1)] is a compound (
  • the composition for forming the protective layer (OC layer) [hereinafter also referred to as the composition (E_ 1)] is water: 100 parts by mass, polyvinyl alcohol resin powder (manufactured by Kuraray Co., Ltd., average polymerization degree: 18,000, commercial product). Name: KL — 3 18): 3 parts by weight, polyamide epoxy resin (crosslinking agent, manufactured by Sumika Chemtex Co., Ltd., trade name: SR 650 (30) ): Prepared by mixing 1.5 parts by weight did.
  • composition for forming an alignment film was coated on the TAC film side as follows.
  • the TAC film side was subjected to corona treatment once.
  • the corona treatment conditions were an output of 0.3 kW and a treatment speed of 3 m/min.
  • the composition (D-1) obtained as described above was applied onto the TAC by a bar coating method, and was heated and dried in a drying oven at 80 ° C for 1 minute.
  • the obtained dried film was subjected to polarized UV irradiation treatment to form a first alignment film (AL 1).
  • the polarized UV treatment uses the light emitted from the UV irradiator (SPOT CU RES P-7; made by Ushio Electric Co., Ltd.) and wire grid (U ⁇ S-27 1 32 ##, made by Ushio Electric Co., Ltd.).
  • the thickness of the first alignment film (AL 1) was 100 nm.
  • the composition (A-1) was applied onto the formed first alignment film (AL 1) by the Percoat method, and was dried by heating in a drying oven at 120 ° C for 1 minute, and then cooled to room temperature.
  • the polarizer layer By irradiating the dry film with ultraviolet rays at an integrated light amount of 1,200 mJ/cm 2 (365 nm standard) using the above UV irradiation device, the polarizer layer (
  • the composition (N_ 1) was applied on the formed polarizer layer ( ⁇ ⁇ ) by the bar coat method, and the coating was applied so that the thickness after drying was 1.0 ⁇ , and the temperature was 80 ° ⁇ . Dry for 3 minutes. In this way, a laminated body made of "Choho Film/O!_ (Eight 1_1 + O10 Protection Layer)" was obtained.
  • Polymer 1 having a photoreactive group consisting of the following structural units was prepared.
  • composition ( ⁇ _1) A solution prepared by dissolving Polymer 1 at a concentration of 5% by mass in cyclopentanone was used as a composition for forming an alignment film [hereinafter, also referred to as a composition ( ⁇ _1)].
  • a base material prepare a polyethylene terephthalate film (Nincho) with a thickness of 100 001, apply the composition (0_1) on the film by the bar coating method, and heat-dry in a drying oven at 80 ° ⁇ for 1 minute. did.
  • the obtained dried film was subjected to polarized II V irradiation treatment to form a second alignment film (!_ 2).
  • Polarization II V process above using Li V irradiator wavelength 365 n cumulative amount of light measured in m is 1 00 It was performed under the condition of 2 .
  • the polarization direction of polarized light II V was set to be 45° with respect to the absorption axis of the polarizer layer. In this way, "base material (Mitsuingo)"
  • the composition (Mimi _ 1) was applied on the second alignment film (8!_2) of the first substrate thus obtained by the bar coating method, and was heated and dried for 1 minute in a drying oven at 120 ° ⁇ . After that, it was cooled to room temperature. Using the above II V irradiation device, the accumulated light intensity was applied to the obtained dried film.
  • the retardation layer was formed by irradiating (365 n standard) ultraviolet rays. The thickness of the obtained retardation layer was measured by a laser microscope (01-33000, manufactured by Olympus Corporation) and found to be 2.0.
  • the retardation layer was a S/4 plate ( ⁇ ) showing a retardation value of S/4 in the in-plane direction. In this way, a laminated body consisting of "base material (Mita)/ha 1_2/ ⁇ /" was obtained.
  • An acrylic resin was obtained by reacting the following components at 55 ° with stirring under a nitrogen atmosphere.
  • Acrylic acid 2.0 parts by mass
  • Radical polymerization initiator (2,2'-azobisisoptyronitrile): 0.2 parts by mass
  • Acrylic resin 100 parts by mass
  • Cross-linking agent (Coronate!-" manufactured by Tosoh Corporation): 1.0 part by mass
  • Silane coupling agent (Shin-Etsu Silicon Co., Ltd. " ⁇ _ 1 2-981")
  • the obtained pressure-sensitive adhesive composition was applied to the release-treated surface of a release-treated polyethylene terephthalate film (heavy separator, thickness 38) using an applicator so that the thickness after drying would be 5.
  • the coating layer was dried at 100° for 1 minute to obtain a film having an adhesive layer.
  • another release-treated polyethylene terephthalate film (light separator, thickness 38) was laminated on the exposed surface of the adhesive layer.
  • the temperature is 23° (:, relative humidity 50%
  • a light separator/common pressure-sensitive adhesive layer/heavy separator was obtained.
  • a laminate was manufactured by the procedure shown in Fig. 4 (3) to (6).
  • the laminated body containing the above-mentioned polarizer layer 4 10 [Choho 801 film 301 / ⁇ 1_ ((8 1_1 + ⁇ 1) 302 / ⁇ ⁇ layer 303)] and the above-mentioned common adhesive sheet 420 (light separator
  • Laminated body including the polarizer layer 4 10 side of the ⁇ layer 303 and the common adhesive sheet
  • Corona treatment on the exfoliated surface of 420 light separator 304 (output ⁇ ⁇ 3 ⁇ /, speed After applying, it was laminated to obtain a laminate 3430.
  • the above-mentioned retardation layer 440 [base material (Ming) 308/ !_ 2/ ⁇ /307] was prepared.
  • Corona treatment was applied to the surface where 306 and 306 were peeled off (output ⁇ . After that, they were laminated to each other to obtain a laminate Sabo 450. After that, the pressure-sensitive adhesive sheet 12 prepared above was prepared as the pressure-sensitive adhesive sheet 460 (light separator 309/pressure-sensitive adhesive layer 310/heavy separator 311) (Fig. 4 ( ⁇ )).
  • the pressure-sensitive adhesive layer 310 of the pressure-sensitive adhesive sheet 460 corresponds to the second pressure-sensitive adhesive layer.
  • Corona treatment (output ⁇ ⁇ 3 ⁇ //, speed 3 / min) was applied to the surface from which the light separator 309 of No. 0 was peeled off, and then laminated to obtain a laminated body ⁇ 470.
  • the adhesive ⁇ 2020/175089 45 ⁇ (: 170? 2020 /004752
  • the pressure-sensitive adhesive sheet 8 1 1 prepared above as the 490 (light separator 3 1 4/adhesive layer 3 1 5/heavy separator 3 16), and remove the light separator 3 1 4 from the above-mentioned surface.
  • the front plate 480 polyimide film 3 13/hard coat layer 3 12) of the polyimide film 3 1 3 side and corona treated (output 0.3 ⁇ , After applying, they were laminated to obtain a laminate 500 (Fig. 4 ()).
  • the adhesive layer 315 of the adhesive sheet 490 corresponds to the first adhesive layer.
  • Corona treatment was applied to the surface of the laminated body 500 from which the heavy separators 3 1 6 were peeled off, and to the 8103 side of the laminated body 470. After giving
  • Example 1 was laminated to obtain a laminate 300 of Example 1 (Fig. 4 ( 6 )).
  • the laminate of Example 1 was evaluated for room temperature flexibility and room temperature adhesion durability by the methods described below. The results are shown in Table 4.
  • Example 1 in the same manner as in Example 1 except that the pressure-sensitive adhesive sheet having the pressure-sensitive adhesive layer shown in Table 4 was used instead of using the pressure-sensitive adhesive sheets 8 1 1 and 8 1 2. 2 to 5, laminates of Comparative Examples 1 and 2 were produced. The laminates of Examples 2 to 5 and Comparative Examples 1 and 2 were evaluated for room temperature flexibility and room temperature adhesion durability by the methods described below. The results are shown in Table 4.
  • FIG. 3 is a diagram schematically showing the method of this evaluation test.
  • two individually movable mounting tables 501 and 502 have a gap of 6. (38) so that the center in the width direction is located at the center of the gap ⁇ and the hard coat layer 3 1 2 is located on the upper side.
  • Figure 3 (3) Then rotate the two mounting tables 501 and 502 to position 1 and position 2. ⁇ 2020/175089 46 ⁇ (: 170? 2020 /004752
  • a bending force (bending force with the front plate 480 facing inward) was applied to the area of the stack corresponding to the gap ⁇ 3 of the mounting table (Fig. 3 ( ⁇ )). After that, the two mounting tables 50 1 and 50 2 were returned to their original positions (Fig. 3 (3)). After completing the above series of operations, the bending force was applied once. After repeating this operation at a temperature of 25 ° , it was confirmed whether or not air bubbles were generated in the pressure-sensitive adhesive layer in the gap between the mounting tables 50 1 and 50 2 of the laminated body (the region corresponding to 3).
  • Bubbles were generated when the bending force was applied more than 50,000 and less than 100,000.
  • Mami Bubbles/adhesive loss occurred when the bending force was applied less than 50,000 times.
  • the laminates obtained in each of the examples and each of the comparative examples were cut into a width of 10000 and a length of 100.
  • the heavy separator 3 1 1 was peeled off and bonded to non-alkali glass. It was pressure-bonded for about 20 minutes in an autoclave (50 ° ⁇ , 5 atm), and kept under constant temperature and humidity conditions (23° ⁇ , 50% [3 ⁇ 4 1 to 1] for 4 hours. The sample was placed in an oven at 250 ° and after 250 hours, it was judged whether it floated, peeled off, or had air bubbles.
  • non-alkali glass corresponds to the back plate.
  • ⁇ Almost no change in appearance such as floating, peeling and foaming.
  • Comparative Examples 1 and 2 are related to “[3 ⁇ 4 0 1 ⁇ [3 ⁇ 4 0 2” and the thickness of the first adhesive layer and the second adhesive layer are the same, so that “1 ⁇ It can be determined that the relationship is “3 ⁇ 4”.
  • Polarizer layer 1 04 2nd pressure-sensitive adhesive layer, 1 05 back plate, 1 06 1st retardation layer, 1 07 2nd retardation layer, 1 08, 1 09, 301 chopstick film,
  • 3 16 heavy separator 307 ⁇ , 308 base material, 304, 309, 3 1 4 light separator, 3 1 0, 3 1 5 adhesive layer, 3 1 2 hard coating layer, 3 1 3 polyimide film, 4 10 Laminated body including polarizer layer, 42 ⁇ Common adhesive sheet, 430 Laminated body 3, 440 Retardation layer, 450 laminated body 460, 490 Adhesive sheet, 470 laminated body ⁇ , 500 laminated body, Laminating layer, 501, 502 stage.

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Abstract

L'objectif de la présente invention est de fournir un stratifié souple qui présente une excellente adhérence et dans lequel l'apparition de bulles d'air est supprimée même lorsque le stratifié souple est fléchi de manière répétée, un côté de plaque avant étant un côté interne de celui-ci. La présente invention concerne un stratifié souple comprenant une plaque avant, une première couche adhésive formée à l'aide d'une première composition adhésive, une couche de polariseur, une seconde couche adhésive formée à l'aide d'une seconde composition adhésive, et une plaque arrière dans cet ordre. Le stratifié souple satisfait l'expression relationnelle (1) : R1 > R2, où R1 (%) est le module de fluage en cisaillement de la première couche adhésive à une température de 25 °C, et R2 (%) est le module de fluage en cisaillement de la seconde couche adhésive à une température de 25° C.
PCT/JP2020/004752 2019-02-27 2020-02-07 Stratifié souple WO2020175089A1 (fr)

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