WO2020262143A1 - Optical layered body - Google Patents

Optical layered body Download PDF

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Publication number
WO2020262143A1
WO2020262143A1 PCT/JP2020/023758 JP2020023758W WO2020262143A1 WO 2020262143 A1 WO2020262143 A1 WO 2020262143A1 JP 2020023758 W JP2020023758 W JP 2020023758W WO 2020262143 A1 WO2020262143 A1 WO 2020262143A1
Authority
WO
WIPO (PCT)
Prior art keywords
layer
optical laminate
pressure
polarizing plate
sensitive adhesive
Prior art date
Application number
PCT/JP2020/023758
Other languages
French (fr)
Japanese (ja)
Inventor
幹士 藤井
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 CN202080042643.6A priority Critical patent/CN113939751A/en
Publication of WO2020262143A1 publication Critical patent/WO2020262143A1/en

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    • 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
    • G02B5/3041—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 comprising multiple thin layers, e.g. multilayer stacks
    • 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
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/02—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions
    • B32B3/08—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions characterised by added members at particular parts
    • 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
    • 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
    • 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
    • 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

Definitions

  • the present invention relates to an optical laminate containing a polarizing plate.
  • the polarizing plate is widely used as a polarization supply element in a display device such as a liquid crystal display device or an organic electroluminescence (EL) display device, and as a polarization detection element.
  • a polarizing plate having a protective film adhered to one side or both sides of a polarizing element has been used.
  • Display devices equipped with polarizing plates are also being deployed in mobile devices such as notebook personal computers and mobile phones, and due to demands for diversification of display purposes, clarification of display categories, decoration, etc., the transmittance is high.
  • Polarizing plates with different regions are required.
  • a polarizing plate may be attached to the entire surface in order to make the design seamless over the entire surface from the viewpoint of decorativeness.
  • the polarizing plate since the polarizing plate also overlaps the area of the camera lens and the area of the icon or logo printing at the bottom of the screen, there is a problem that the sensitivity of the camera is deteriorated or the design is inferior.
  • a non-polarized portion is formed by performing processing such as forming a hole in the polarizing plate to suppress deterioration of the sensitivity and design of the camera, and by chemically treating the polarizing element contained in the polarizing plate. , It is known that the camera performance is not adversely affected (for example, Patent Documents 1 to 3).
  • JP-A-2017-194568 Japanese Unexamined Patent Publication No. 2018-28563 JP-A-2018-31954
  • the polarizing plate having a hole is bonded to a member or the like forming a display device via a bonding layer such as an adhesive layer or an adhesive layer.
  • a bonding layer such as an adhesive layer or an adhesive layer.
  • An object of the present invention is to provide an optical laminate capable of suppressing problems such as generation of air bubbles and mixing of foreign substances when laminating a polarizing plate on another member.
  • the present invention provides the following optical laminates.
  • the polarizing layer and the protective layer provided on one side or both sides of the polarizing layer are laminated, and include a polarizing plate having a hole portion penetrating the polarizing layer and the protective layer in the stacking direction.
  • the hole is an optical laminate filled with a translucent filler.
  • the filler is the same pressure-sensitive adhesive as the pressure-sensitive adhesive constituting the second pressure-sensitive adhesive layer.
  • the second functional layer includes at least one of a touch sensor panel and a cover member.
  • the layer (first release film or image display element layer) provided "on the surface side of the first pressure-sensitive adhesive layer opposite to the polarizing plate” is in direct contact with the first pressure-sensitive adhesive layer. Including cases where there is direct contact and cases where there is no direct contact. The same applies to the layer (second release film or second functional layer) provided "on the surface side of the second pressure-sensitive adhesive layer opposite to the polarizing plate".
  • the layer provided "on the surface” means a layer in contact with the surface.
  • an optical laminate having a structure in which a polarizing plate having a hole is laminated on another member, but less bubbles are generated and foreign matter is mixed in.
  • FIG. 1 It is a schematic plan view which shows typically an example of the optical laminated body of this invention. It is xx'cross-sectional view of the optical laminated body shown in FIG. It is the schematic sectional drawing which shows another example of the optical laminated body of this invention schematically. It is schematic cross-sectional view which shows still another example of the optical laminated body of this invention schematically. It is schematic cross-sectional view which shows still another example of the optical laminated body of this invention schematically. (A) and (b) are schematic cross-sectional views schematically showing still another example of the optical laminate of the present invention. It is schematic cross-sectional view which shows still another example of the optical laminated body of this invention schematically.
  • FIG. 1 is a schematic plan view schematically showing an example of the optical laminate of the present invention.
  • FIG. 2 is a cross-sectional view taken along the line xx'of the optical laminate shown in FIG.
  • the optical laminate 1 shown in FIGS. 1 and 2 has a polarizing plate 10.
  • the polarizing plate 10 has a polarizing layer 11 and a protective layer 12 provided on one or both sides of the polarizing layer 11 laminated, and has a hole 15 penetrating the polarizing layer 11 and the protective layer 12 in the stacking direction.
  • the hole 15 is filled with a translucent filler.
  • the polarizing layer 11 does not exist in the hole 15 of the polarizing plate 10, and the region where the hole 15 is located can be a non-polarizing region. Therefore, when the optical laminate 1 is applied to a display device such as a liquid crystal display device or an organic EL display device developed in a smartphone, a tablet type terminal, or the like, a camera lens or an icon is formed in the area where the hole portion 15 is located.
  • a display device such as a liquid crystal display device or an organic EL display device developed in a smartphone, a tablet type terminal, or the like
  • a camera lens or an icon is formed in the area where the hole portion 15 is located.
  • the hole 15 of the polarizing plate 10 is filled with the filler 20, the hole 15 can be made solid so that no cavity exists. As a result, it is possible to prevent foreign matter from being mixed into the hole 15 of the polarizing plate 10. Further, as will be described later, an adhesive layer was formed on the release film on the surface of the polarizing plate 10 on which the other side of the hole 15 is located in a state where one side of the hole 15 of the polarizing plate 10 is closed. When laminating an adhesive sheet or a functional layer (cover member, touch sensor panel, optical film, etc., which will be described later), it is necessary to prevent foreign matter from being mixed into the hole 15 or air bubbles from being mixed around the hole 15. Can be done.
  • the hole 15 When the hole 15 is not filled with the filler 20, it is necessary to perform the above-mentioned lamination while performing heat treatment in the vacuum booth as necessary in order to suppress the mixing of foreign substances and air bubbles.
  • the hole portion 15 is filled with the filler 20 as in the present embodiment, foreign matter and air bubbles are suppressed from being mixed even if the above lamination is not performed under vacuum conditions or vacuum heating conditions. It will be easier.
  • the plan view shape of the optical laminate 1 is not particularly limited, but is usually a quadrangular shape as shown in FIG.
  • the rectangular shape forming the optical laminate 1 may be rectangular or square, and at least one of the four corners may be rounded (a shape having an R).
  • the optical laminate 1 shown in FIG. 1 is a single-wafered body, but may be a long body.
  • the optical laminate 1 may be cut into a predetermined shape, if necessary.
  • the optical laminate 1 may have a protective film on one side or both sides.
  • the protective film is provided in order to prevent scratches, stains, and the like from being generated on the surface of the polarizing plate 10 during the production of a product using the optical laminate 1 and the production and transportation of the optical laminate 1.
  • the protective film is provided so as to be peelable from the polarizing plate 10.
  • the protective film may be a base film having an adhesive layer, or may be a self-adhesive film. Examples of the resin used for the base film of the protective film include the resin used for the protective layer described later, and examples of the pressure-sensitive adhesive layer include the pressure-sensitive adhesive described later.
  • the self-adhesive film can be formed by using, for example, a polypropylene-based resin, a polyethylene-based resin, or the like.
  • the polarizing plate 10 has a polarizing layer 11 and a first protective layer 12a and a second protective layer 12b provided on both sides of the polarizing layer 11, respectively.
  • the first protective layer 12a and the second protective layer 12b may be provided on the polarizing layer 11 via a bonding layer such as an adhesive layer or an adhesive layer, and may be provided on the polarizing layer 11 without a bonding layer. It may be provided directly to.
  • the polarizing plate 10 may include only one of the first protective layer 12a and the second protective layer 12b shown in FIG.
  • the polarizing plate 10 has a hole portion 15 that penetrates the polarizing layer 11, the first protective layer 12a, and the second protective layer 12b in the stacking direction. That is, the polarizing layer 11, the first protective layer 12a, and the second protective layer 12b also have holes penetrating in the thickness direction thereof.
  • the planar shape of the hole 15 is not particularly limited, but is circular; oval; oval; polygon such as a triangle or a quadrangle; at least one of the polygons has rounded corners (shape having R). It can be a polygon or the like.
  • the diameter of the hole 15 is preferably 0.5 mm or more, and may be 1 mm or more, 2 mm or more, or 3 mm or more.
  • the diameter of the hole 15 is preferably 20 mm or less, may be 15 mm or less, may be 10 mm or less, or may be 7 mm or less.
  • the diameter of the hole means the diameter of the circle when the plan view shape of the hole is circular (perfect circle), and when the plan view shape of the hole is other than circular (perfect circle). Refers to the diameter of the circumscribing circle (perfect circle) of the hole in the plan view.
  • the thickness of the polarizing plate 10 is preferably 15 ⁇ m or more, more preferably 30 ⁇ m or more, 50 ⁇ m or more, 60 ⁇ m or more, or 80 ⁇ m or more.
  • the thickness of the polarizing plate 10 is usually 300 ⁇ m or less, may be 250 ⁇ m or less, may be 200 ⁇ m or less, or may be 150 ⁇ m or less.
  • the hole 15 in the polarizing plate 10 can be formed by punching, cutting, cutting, laser cutting, or the like.
  • the polarizing plate 10 may have one hole 15 or two or more holes 15. When two or more holes 15 are provided, the shapes and diameters of the holes 15 may be the same or different from each other.
  • the polarizing layer 11 is a linear polarized light having a property of transmitting linearly polarized light having a vibration plane orthogonal to the absorption axis when unpolarized light is incident.
  • the polarizing layer 11 is formed by, for example, subjecting a polyvinyl alcohol (hereinafter, sometimes referred to as “PVA”) film to a dyeing treatment, a stretching treatment, a cross-linking treatment, or the like with a dichroic substance such as iodine or a dichroic dye.
  • PVA polyvinyl alcohol
  • the polarizing layer 11 may be a cured film obtained by orienting a dichroic dye on a polymerizable liquid crystal compound and polymerizing the polymerizable liquid crystal compound.
  • a composition for forming a polarizer containing a polymerizable liquid crystal compound and a dichroic dye is applied onto a base film, and the polymerizable liquid crystal compound is polymerized while maintaining the liquid crystal state. Can be obtained by curing.
  • the thickness of the polarizing layer 11 can be 40 ⁇ m or less, preferably 30 ⁇ m or less (for example, 20 ⁇ m or less, further 15 ⁇ m or less, and further 10 ⁇ m or less or 8 ⁇ m or less).
  • the thickness of the polarizing layer 11 is usually 2 ⁇ m or more, and may be 5 ⁇ m or more.
  • the protective layer 12 (first protective layer 12a, second protective layer 12b) provided on one side or both sides of the polarizing layer 11 is not limited as long as it is a resin layer capable of transmitting light, and may be a resin film. , It may be a coating layer formed by coating a composition containing a resin.
  • the resin used for the resin layer is preferably a thermoplastic resin having excellent transparency, mechanical strength, thermal stability, moisture blocking property, isotropic property, stretchability and the like.
  • thermoplastic resins include cellulose resins such as triacetyl cellulose; polyester resins such as polyethylene terephthalate and polyethylene naphthalate; polyether sulfone resins; polysulfone resins; polycarbonate resins; nylons and aromatics.
  • Polyamide-based resin such as polyamide; Polyethylene-based resin; Polyethylene-based resin such as polyethylene, polypropylene, ethylene / propylene copolymer; Cyclic polyolefin-based resin having cyclo-based and norbornene structure); (Meta) acrylic-based resin; Polyallylate-based Resins; polystyrene-based resins; polyvinyl alcohol-based resins, and mixtures thereof.
  • the resin compositions of the protective layers 12 may be the same or different from each other.
  • the protective layer 12 When the protective layer 12 is a resin film, the protective layer 12 can be provided on the polarizing layer 11 via a bonding layer. As the pressure-sensitive adhesive and the adhesive constituting the bonding layer, the pressure-sensitive adhesive and the adhesive described later can be used. When the protective layer 12 is a coating layer, it can be formed by coating the composition containing the above-mentioned resin on the polarizing layer 11.
  • the thickness of the protective layer 12 is usually 200 ⁇ m or less, preferably 150 ⁇ m or less, more preferably 100 ⁇ m or less, 80 ⁇ m or less, or 60 ⁇ m or less. Good.
  • the thickness of the protective layer 12 is usually 5 ⁇ m or more, may be 10 ⁇ m or more, or may be 20 ⁇ m or more.
  • the protective layer 12 may or may not have a phase difference. When the protective layers 12 are laminated on both surfaces of the polarizing layer 11, the thicknesses of the protective layers 12 may be the same or different from each other.
  • the hole 15 of the polarizing plate 10 is filled with the filler 20.
  • the filler 20 is usually provided so as to fill the entire hole 15.
  • the filler 20 has translucency.
  • translucency means a property that 80% or more of visible light in the wavelength range of 400 nm to 700 nm is transmitted.
  • the translucency of the filler 20 may be such that visible light in the above wavelength region transmits 85% or more, 90% or more, or 95% or more. Good.
  • the filler 20 is not particularly limited as long as it has translucency and can fill the hole 15 of the polarizing plate 10, but it preferably contains a resin.
  • the resin include one or more selected from the group consisting of adhesives, adhesives, and thermoplastic resins.
  • the pressure-sensitive adhesive exhibits adhesiveness by sticking itself to an adherend, and is a so-called pressure-sensitive adhesive.
  • the pressure-sensitive adhesive include those containing a polymer such as a (meth) acrylic polymer, a silicone polymer, a polyester polymer, a polyurethane polymer, a polyether polymer, or a rubber polymer as a main component.
  • the main component means a component containing 50% by mass or more of the total solid content of the pressure-sensitive adhesive.
  • the pressure-sensitive adhesive may be an active energy ray-curable type or a thermosetting type, and the degree of cross-linking and the adhesive strength may be adjusted by irradiation with active energy rays or heating.
  • the term "(meth) acrylic” means that it may be either acrylic or methacrylic.
  • the adhesive a (meth) acrylic adhesive is preferable from the viewpoint of transparency, adhesive strength, reliability, weather resistance, heat resistance, and the like.
  • the (meth) acrylic pressure-sensitive adhesive includes a (meth) acrylic acid alkyl ester having an alkyl group having 20 or less carbon atoms such as a methyl group, an ethyl group, an n-, i- or t-butyl group, and (meth).
  • a weight average molecular weight of a functional group-containing (meth) acrylic monomer such as acrylic acid or hydroxyethyl (meth) acrylic acid blended so that the glass transition temperature is preferably 25 ° C. or lower, more preferably 0 ° C. or lower.
  • a (meth) acrylic polymer having a value of 100,000 or more is useful as a main component.
  • the adhesive contains a curable resin component (so-called curable resin), and is an adhesive other than a pressure-sensitive adhesive (adhesive).
  • curable resin a curable resin component
  • adhesive an adhesive other than a pressure-sensitive adhesive (adhesive).
  • examples of the adhesive include an aqueous adhesive in which a curable resin component is dissolved or dispersed in water, an active energy ray-curable adhesive containing an active energy ray-curable compound, and a thermosetting adhesive.
  • Examples of the resin component contained in the water-based adhesive include polyvinyl alcohol-based resin and urethane-based resin.
  • Examples of the active energy ray-curable adhesive include compositions that are cured by irradiation with active energy rays such as ultraviolet rays, visible light, electron beams, and X-rays.
  • the composition that is cured by irradiation with active energy rays is preferably an ultraviolet curable composition, and more preferably contains an epoxy compound that is cured by cationic polymerization as a curable component.
  • Examples of the thermosetting adhesive include those containing an epoxy resin, a silicone resin, a phenol resin, a melamine resin, or the like as a main component.
  • thermoplastic resin examples include polyolefin resins such as chain polyolefin resins (polypropylene resins, etc.) and cyclic polyolefin resins (norbornene resins, etc.); cellulose ester resins such as triacetyl cellulose and diacetyl cellulose; polyethylene terephthalates, Polyester-based resins such as polyethylene naphthalate and polybutylene terephthalate; polycarbonate-based resins; (meth) acrylic-based resins; polystyrene-based resins and the like can be mentioned.
  • the thermoplastic resin may be, for example, a filamentous thermoplastic resin used in a 3D printer or the like.
  • the above-mentioned pressure-sensitive adhesive, adhesive, or thermoplastic resin is injected into the hole 15 of the polarizing plate 10 in a state of fluidity such as liquid, fine particles, or powder, and if necessary after injection, in a liquid state.
  • a molded product obtained by molding the pressure-sensitive adhesive, adhesive, or thermoplastic resin according to the shape of the hole portion 15 is formed in advance, and the hole portion 15 of the polarizing plate 10 is fitted into the molded product.
  • the filler 20 may be filled according to the above. In this case, it is preferable to form the molded product in the same size as the shape of the hole portion 15, or to form the molded product in a size more than 0 mm and 0.2 mm or less smaller than the size of the hole portion 15.
  • FIG. 3 is a schematic cross-sectional view schematically showing another example of the optical laminate of the present invention.
  • the optical laminate 2 shown in FIG. 3 further has a first pressure-sensitive adhesive layer 31 and a first release film 32 on one surface side of the optical laminate 1 shown in FIG. 2 in this order.
  • the first pressure-sensitive adhesive layer 31 may be provided on the second protective layer 12b of the polarizing plate 10, or may be provided on the first protective layer 12a.
  • the first pressure-sensitive adhesive layer 31 and the first release film 32 can be provided on the protective layer 12 or the polarizing layer 11 in this order.
  • FIG. 3 is a schematic cross-sectional view schematically showing another example of the optical laminate of the present invention.
  • the optical laminate 2 shown in FIG. 3 further has a first pressure-sensitive adhesive layer 31 and a first release film 32 on one surface side of the optical laminate 1 shown in FIG. 2 in this order.
  • the first pressure-sensitive adhesive layer 31 may be provided on the second protective layer 12b of the polarizing plate 10, or may be provided on
  • the first pressure-sensitive adhesive layer 31 may be provided so as to be in direct contact with the polarizing plate 10, and as will be described later, the first functional layer (optical) provided as a protective layer of the polarizing plate 10. It may be provided so as to be in direct contact with the film, the touch sensor panel, etc.).
  • the first pressure-sensitive adhesive layer 31 can be used as a bonding layer for bonding with an image display element layer described later.
  • the first pressure-sensitive adhesive layer 31 may have a hole portion penetrating in the stacking direction of the layer in the region where the hole portion 15 of the polarizing plate 10 is located.
  • the holes of the first pressure-sensitive adhesive layer 31 are preferably filled with the filler 20.
  • the pressure-sensitive adhesive constituting the first pressure-sensitive adhesive layer 31 may be used as the filler 20 for filling the hole 15 of the polarizing plate 10.
  • the first release film 32 can be used to coat and protect the surface of the first pressure-sensitive adhesive layer 31 on the side opposite to the polarizing plate 10 side.
  • the first release film 32 can be peeled off from the first pressure-sensitive adhesive layer 31.
  • the first release film 32 does not have a hole in the region where the hole 15 of the polarizing plate 10 is located.
  • the optical laminate 2 when the polarizing plate 10 has a protective layer on only one side, it is preferable to have a protective layer (first protective layer 12a in FIG. 3) on the side where the first adhesive layer 31 is not provided.
  • the optical laminate 2 does not have to have the first release film 32.
  • a first pressure-sensitive adhesive sheet provided with a first pressure-sensitive adhesive layer 31 on a first release film 32 is laminated on the above-mentioned polarizing plate 10, and then the holes 15 are filled with a filler 20. Can be obtained by doing.
  • the hole portion 15 is formed only in the polarizing plate, and the hole portion 15 is filled with the filler 20. It can also be obtained by
  • the optical laminate 2 may be obtained by laminating the first adhesive sheet on the optical laminate 1 (FIG. 2).
  • the optical laminate 2 can also be obtained by the following procedure. First, a laminated body (1) is obtained by laminating an adhesive sheet provided with the first adhesive layer 31 on a release film on a polarizing plate in which the hole portion 15 is not formed. Subsequently, in order to form the hole portion 15 of the polarizing plate 10, a hole portion that penetrates the entire laminated body (1) in the lamination direction is formed, and then the release film is peeled off, and the first adhesive exposed by the peeling is peeled off. The laminated body (2) is obtained by laminating the first release film 32 on the agent layer 31. Further, the optical laminate 2 is obtained by filling the holes of the laminate (2) with the filler 20.
  • the optical laminate 2 can also be obtained by the following procedure. First, a protective film is laminated on the first protective layer 12a side of the polarizing plate 10 having holes 15 that are not filled with the filler. Next, the material of the filler 20 is injected into the hole 15, and an adhesive for forming the first adhesive layer 31 is further applied to the surface of the polarizing plate 10 on the opposite side of the protective film. To do. Then, the applied pressure-sensitive adhesive and the material of the filler 20 are simultaneously heated to be cured. By this curing, the first pressure-sensitive adhesive layer 31 is formed on the surface of the polarizing plate 10 opposite to the protective film, and the first release film 32 is formed on the surface of the first pressure-sensitive adhesive layer 31 opposite to the polarizing plate 10. Are laminated.
  • the protective film laminated on the polarizing plate 10 can be peeled off and removed as needed.
  • the material constituting the filler 20 is a pressure-sensitive adhesive
  • the injection of the pressure-sensitive adhesive into the holes of the polarizing plate and the coating of the pressure-sensitive adhesive on the polarizing plate may be performed at the same time.
  • the first pressure-sensitive adhesive layer 31 is formed by using a pressure-sensitive adhesive, and the above-mentioned pressure-sensitive adhesive can be used.
  • the thickness of the first pressure-sensitive adhesive layer 31 is not particularly limited, and may be 10 ⁇ m or more, 15 ⁇ m or more, or 20 ⁇ m or more.
  • the thickness of the first pressure-sensitive adhesive layer 31 is usually 50 ⁇ m or less, may be 40 ⁇ m or less, may be 30 ⁇ m or less, or may be 25 ⁇ m or less.
  • the first release film 32 for example, a resin film having a mold release treatment on the side in contact with the first pressure-sensitive adhesive layer 31 can be used.
  • the resin film include a film made of a polyethylene resin such as polyethylene, a polypropylene resin such as polypropylene, and a polyester resin such as polyethylene terephthalate.
  • the mold release treatment include silicone coating and the like.
  • the thickness of the first release film 32 is not particularly limited, and may be 20 ⁇ m or more, 25 ⁇ m or more, usually 50 ⁇ m or less, 40 ⁇ m or less, or 30 ⁇ m or less. ..
  • the release film the one exemplified in the first release film 32 can be used.
  • FIG. 4 is a schematic cross-sectional view schematically showing still another example of the optical laminate of the present invention.
  • the optical laminate 3 shown in FIG. 4 has a second adhesive layer 41 and a second release film 42 mounted on the first protective layer 12a (the other surface of the polarizing plate 10) of the optical laminate 2 shown in FIG. Have in order.
  • the second pressure-sensitive adhesive layer 41 is provided so as to be in direct contact with the polarizing plate 10 of the optical laminate 2.
  • the second adhesive layer 41 can be used as a bonding layer for bonding with a second functional layer (cover member, touch sensor panel, etc.) described later.
  • the second release film 42 can be used to coat and protect the surface of the second pressure-sensitive adhesive layer 41 on the side opposite to the polarizing plate 10 side.
  • the second release film 42 can be peeled off from the second pressure-sensitive adhesive layer 41.
  • the optical laminate 3 does not have to have the second release film 42.
  • the second member is placed in a high temperature environment (for example, at a temperature of 85 ° C. for 100 hours). Problems such as peeling of the pressure-sensitive adhesive layer 41 and light leakage can be suppressed.
  • the filler 20 is preferably the same adhesive as the adhesive constituting the second adhesive layer 41.
  • the optical laminate 3 can be efficiently manufactured. As a result, when the optical laminate 3 is applied to the display device, the sensitivity of the camera is reduced and the design is reduced when the camera lens or the printing portion such as an icon or logo is arranged in the area where the hole portion 15 is located. It is possible to suppress deterioration of sex.
  • the optical laminate 3 can be obtained, for example, by laminating a second adhesive sheet provided with a second adhesive layer 41 on a second release film 42 on the polarizing plate 10 of the optical laminate 2 described above. ..
  • the optical laminate 2 (FIG. 3) is used for laminating with the second adhesive sheet, foreign matter may be mixed into the hole 15 or the hole 15 may be laminated when the optical laminate 2 and the second adhesive sheet are laminated. It is possible to prevent air bubbles from being mixed in the surrounding area.
  • the first pressure-sensitive adhesive layer 31 and the first release film 32 are provided, and one side of the hole 15 is closed by the first pressure-sensitive adhesive layer 31 and the first release film 32. ..
  • vacuum conditions or vacuum heating conditions are used so that foreign matter does not get mixed in the hole or bubbles are not generated around the hole. It needs to be laminated with the second adhesive sheet below.
  • the optical laminate 2 whose holes are filled with the filler 20 and the second adhesive sheet are laminated, foreign matter and air bubbles are mixed even if they are not laminated under vacuum conditions or vacuum heating conditions. It can be suppressed. However, in order to further suppress the mixing of foreign substances and air bubbles on the bonding surface between the optical laminate 2 and the second adhesive sheet, the optical laminate 2 and the second adhesive sheet are laminated under vacuum conditions or vacuum heating conditions. You may go below.
  • the optical laminate 2 When the optical laminate 3 is a long body, the optical laminate 2 (FIG. 3) and the second adhesive sheet are usually continuously laminated.
  • the second adhesive sheet When an optical laminate having a hollow hole is used, the second adhesive sheet is laminated so as to suppress the above-mentioned foreign matter and air bubbles from being mixed as compared with the case where an optical laminate without a hollow hole is used. You need to slow down the speed.
  • the lamination of the optical laminate 2 and the second adhesive sheet is about the same as in the case of using the optical laminate having no hollow holes. It can be done at speed.
  • the second pressure-sensitive adhesive layer 41 can be formed by using a pressure-sensitive adhesive.
  • a pressure-sensitive adhesive the above-mentioned ones can be used.
  • the lamination of the optical laminate 2 (FIG. 3) and the second adhesive sheet is performed under heating conditions.
  • the condition of the temperature of 50 ° C. to 70 ° C. is preferable.
  • the optical laminate 3 can also be obtained by the following procedure. First, a first pressure-sensitive adhesive sheet provided with a first pressure-sensitive adhesive layer 31 on a first release film 32 is laminated on a polarizing plate 10 having a hollow hole portion 15. Next, the material of the filler 20 is injected so as to fill the hole 15 of the polarizing plate 10, and the second pressure-sensitive adhesive layer 41 is further formed on the surface side of the polarizing plate 10 opposite to the first pressure-sensitive adhesive sheet. Apply adhesive to make it. Then, the applied pressure-sensitive adhesive and the material of the filler 20 are simultaneously heated to be cured.
  • a second pressure-sensitive adhesive layer 41 is formed on the surface side of the polarizing plate 10 opposite to the first pressure-sensitive adhesive sheet, and a second pressure-sensitive adhesive layer 41 is formed on the surface side of the second pressure-sensitive adhesive layer 41 opposite to the polarizing plate 10. 2
  • the release film 42 is laminated.
  • the optical laminate 3 can also be obtained by the following procedure. First, a second pressure-sensitive adhesive sheet provided with a second pressure-sensitive adhesive layer 41 on a second release film 42 is laminated on a polarizing plate 10 having a hollow hole portion 15. Next, the material of the filler 20 is injected so as to fill the hole 15 of the polarizing plate 10, and the first pressure-sensitive adhesive layer 31 is further formed on the surface side of the polarizing plate 10 opposite to the second pressure-sensitive adhesive sheet. Apply adhesive to make it. Then, the applied pressure-sensitive adhesive and the material of the filler 20 are simultaneously heated to be cured.
  • the first pressure-sensitive adhesive layer 31 is formed on the surface side of the polarizing plate 10 opposite to the second pressure-sensitive adhesive sheet, and the first pressure-sensitive adhesive layer 31 is formed on the surface side of the first pressure-sensitive adhesive layer 31 opposite to the polarizing plate 10. 1
  • the release film 32 is laminated.
  • the thickness of the second pressure-sensitive adhesive layer 41 is not particularly limited, and may be 80 ⁇ m or more, 100 ⁇ m or more, or 120 ⁇ m or more.
  • the thickness of the second pressure-sensitive adhesive layer 41 is usually 200 ⁇ m or less, may be 180 ⁇ m or less, or may be 150 ⁇ m or less.
  • the second release film 42 for example, a resin film having a mold release treatment on the side in contact with the second pressure-sensitive adhesive layer 41 can be used.
  • the resin film and the mold release treatment for example, those mentioned in the first release film 32 can be used.
  • the thickness of the second release film 42 is not particularly limited, and may be 20 ⁇ m or more, 30 ⁇ m or more, usually 100 ⁇ m or less, 80 ⁇ m or less, or 60 ⁇ m or less. ..
  • FIG. 5 is a schematic cross-sectional view schematically showing another example of the optical laminate of the present invention.
  • the optical laminate 4 shown in FIG. 5 is displayed as an image on the first pressure-sensitive adhesive layer 31 in the optical laminate having the same laminated structure as the laminate in which the first release film 32 is peeled from the optical laminate 3 shown in FIG.
  • the element layers 33 are laminated.
  • the optical laminate 4 does not have to have the second release film 42.
  • Examples of the image display element layer 33 include a liquid crystal display element such as a liquid crystal panel included in the liquid crystal display device and a layer including a display element such as an organic EL element included in the organic EL display device.
  • the optical laminate 4 is obtained, for example, by peeling the first release film 32 from the optical laminate 3 (FIG. 4), and further laminating the exposed first adhesive layer 31 and the image display element layer 33. be able to.
  • the optical laminate 4 can also be obtained by the following procedure. First, the first adhesive sheet provided with the first adhesive layer 31 is laminated on the first release film 32 on the polarizing plate 10 having the hollow hole portion 15, and then the first release film 32 is peeled off. After the first pressure-sensitive adhesive layer 31 exposed by peeling off the first release film 32 and the image display element layer 33 are bonded together, the hole portion 15 is filled with the filler 20, and further, the first pressure-sensitive adhesive layer of the polarizing plate is formed. A second pressure-sensitive adhesive sheet provided with the second pressure-sensitive adhesive layer 41 on the second release film 42 is laminated on the surface opposite to the 31 side to obtain an optical laminate 4.
  • optical laminates [4]) 6 (a) and 6 (b) are schematic cross-sectional views schematically showing still another example of the optical laminate of the present invention.
  • the optical laminates 5a and 5b shown in FIGS. 6A and 6B include a first functional layer 34 between the polarizing plate 10 and the first pressure-sensitive adhesive layer 31 in the optical laminate 3 shown in FIG. ..
  • the optical laminates 5a and 5b have a second adhesive layer 41 and a second release film 42 on the first protective layer 12a side of the optical laminate 1 shown in FIG. 2 in this order.
  • the first functional layer 34, the first pressure-sensitive adhesive layer 31, and the first release film 32 are provided in this order on the second protective layer 12b side of 1.
  • optical laminates 5a and 5b when the polarizing plate 10 has a protective layer on only one side, it is preferable to have a protective layer (first protective layer 12a in FIG. 3) on the side where the second adhesive layer 41 is provided. ..
  • the optical laminates 5a and 5b do not have to have the first release film 32.
  • the optical laminates 5a and 5b may have an image display element layer on the first adhesive layer 31 instead of the first release film 32.
  • the optical laminates 5a and 5b do not have to have the second release film 42.
  • a laminating layer may be provided between the optical laminate 1 and the first functional layer 34.
  • the bonding layer is a pressure-sensitive adhesive layer formed of an adhesive or an adhesive layer formed of an adhesive. Examples of the pressure-sensitive adhesive and the adhesive constituting the bonding layer include those described above.
  • the first functional layer 34 includes at least one of an optical film and a touch sensor panel.
  • the optical laminates 5a and 5b may further have a hard coat layer in addition to the first functional layer 34.
  • the first functional layer 34 included in the optical laminates 5a and 5b may have a structure in which two or more optical films are laminated.
  • the optical film When the optical film is provided as the first functional layer 34, the optical film may have holes in the region where the holes 15 of the polarizing plate 10 are located. In this case, as shown in FIG. 6B, it is preferable to provide the filler 20 also in the holes of the optical film (first functional layer 34) in the optical laminate 5b.
  • the hole 15 of the polarizing plate 10 is filled with the filler 20, it is placed in a high temperature environment (for example, at a temperature of 85 ° C. for 100 hours). It is possible to suppress problems such as peeling of the second adhesive layer 41 and light leakage when the second adhesive layer 41 is left unattended.
  • the optical laminate 5a shown in FIG. 6A can be obtained by the following procedure.
  • a first functional layer 34 is provided on a polarizing plate 10 having a hollow hole portion 15, and a first adhesive sheet provided with a first adhesive layer 31 on a first release film 32 is laminated on the first functional layer 34. ..
  • the laminated body (3) is obtained by filling the hole portion 15 with the filler 20.
  • the optical laminate 5a is obtained by laminating a second adhesive sheet provided with the second adhesive layer 41 on the second release film 42 on the polarizing plate 10 of the laminate (3).
  • the first functional layer 34 is provided on the above-mentioned optical laminated body 1 (FIG. 2), and the above-mentioned first adhesive is formed on the first functional layer 34 in the obtained laminated body (3). Sheets may be laminated and obtained.
  • the optical laminate 5b shown in FIG. 6B can be obtained by the following procedure.
  • the first functional layer 34 is provided on a polarizing plate having protective layers 12 on one or both sides of the polarizing layer 11 to obtain a laminated body (4).
  • a hole is formed so as to penetrate the entire laminated body (4) in the laminating direction, and a first adhesive sheet provided with the first adhesive layer 31 is laminated on the first peeling film 32 to be laminated to the laminated body (5).
  • the filler 20 is provided in the hole portion of the laminated body (5), the above-mentioned second adhesive sheet is laminated on the surface of the polarizing plate 10 opposite to the first adhesive layer 31 to obtain optical light.
  • a laminate 5b is obtained.
  • the laminated body (5) may be obtained by the following procedure. An adhesive sheet provided with the first pressure-sensitive adhesive layer 31 on the release film is laminated on the first functional layer 34 of the laminate (4) to obtain a laminate. Subsequently, a laminated body (5) can be obtained by forming a hole portion so as to penetrate the entire laminated body, further peeling the release film, and laminating the first release film 32.
  • the second adhesive sheet may be laminated under vacuum conditions.
  • the filler 20 of the optical laminates 5a and 5b is the same adhesive as the adhesive constituting the second adhesive layer 41, it is carried out under heating conditions (for example, under conditions of a temperature of 50 ° C to 70 ° C). Is preferable.
  • the optical film examples include a retardation film (resin film or a cured film obtained by orienting and polymerizing a polymerizable liquid crystal compound), a reflective film, a transflective reflective film, a brightness improving film, an optical compensation film, a film with an antiglare function, and the like. Can be mentioned.
  • the optical film may be one layer, two or more layers, and in the case of two or more layers, they may be the same optical film or different optical films.
  • the optical film may be a ⁇ / 4 wave plate, a laminated film of a ⁇ / 4 wave plate and a ⁇ / 2 wave plate, or a laminated film of a reverse wavelength dispersive ⁇ / 4 wave plate and a positive C plate. There may be.
  • a bonding layer (adhesive layer or adhesive layer) may be interposed between the films.
  • the touch sensor panel is a sensor that can detect the position touched by a finger, touch pen, or the like.
  • the detection method of the touch sensor panel is not particularly limited, and examples thereof include a touch sensor panel such as a resistive film method, a capacitance coupling method, an optical sensor method, an ultrasonic method, an electromagnetic induction coupling method, and a surface acoustic wave method. Since the cost is low, a touch sensor panel of a resistance film type or a capacitance coupling type is preferably used.
  • the hard coat layer examples include a layer made of a resin such as triacetyl cellulose or an acrylic resin.
  • FIG. 7 is a schematic cross-sectional view schematically showing still another example of the optical laminate of the present invention.
  • a second functional layer 44 is formed on the second adhesive layer 41 of the optical laminate obtained by peeling the second release film 42 from the optical laminate 3 shown in FIG. It is a laminated product.
  • the optical laminate 6 does not have to have the first release film 32.
  • the optical laminate 6 may have an image display element layer on the first pressure-sensitive adhesive layer 31 instead of the first release film 32.
  • the second functional layer 44 includes at least one of a cover member and a touch sensor panel.
  • the second functional layer 44 includes both the cover member and the touch sensor panel, it is preferable to have the touch sensor panel and the cover member in this order from the second adhesive layer 41 side.
  • the optical laminate 6 can be obtained by laminating the second functional layer 44 on the second adhesive layer 41 exposed by peeling the second release film 42 of the optical laminate 3 shown in FIG.
  • the cover member can be used as a member forming the outermost surface of a display device or the like.
  • the cover member is a translucent (preferably optically transparent) plate-like body.
  • the cover member may have a single-layer structure or a multi-layer structure.
  • the cover member is preferably composed of an inorganic material such as glass or tempered glass, and a resin film having a Young's modulus of 2 GPa or more.
  • Inorganic materials such as glass and tempered glass, especially for flexible display applications, resin films are suitable in order to make them flexible, among which polyamide films, polyamideimide films, polyimide films, polyester films, olefin films, etc. Acrylic film and cellulose film are preferable. It is also preferable to disperse inorganic particles such as silica, organic fine particles, rubber particles and the like in the polymer film.
  • the bendable cover member made of a resin film may have a hard coat layer on at least one side. The hard coat layer can be provided on the surface of the resin film by a known method.
  • Examples of the touch sensor panel include those described above.
  • the optical laminates 1 to 4, 5a, 5b, 6 can be used in a display device such as a liquid crystal display device or an organic EL display device.
  • display devices include mobile devices such as smartphones and tablets, televisions, digital photo frames, electronic signboards, measuring instruments and instruments, office equipment, medical equipment, computer equipment and the like.
  • the laminate member when the laminate member is a touch sensor panel, it can be used for a touch panel type display device such as a smartphone or a tablet.

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Abstract

Provided is an optical layered body: in which layered are a polarizing layer and a protective layer disposed on one or both surfaces of the polarizing layer; and which includes a polarizing plate having a hole that penetrates the polarizing layer and the protective layer in the layering direction. The hole is filled with a light-transmitting filler.

Description

光学積層体Optical laminate
　本発明は、偏光板を含む光学積層体に関する。 The present invention relates to an optical laminate containing a polarizing plate.
　偏光板は、液晶表示装置や有機エレクトロルミネッセンス（ＥＬ）表示装置等の表示装置における偏光の供給素子として、また偏光の検出素子として広く用いられている。偏光板は従来より、偏光子の片面又は両面に保護フィルムを接着したものが使用されている。 The polarizing plate is widely used as a polarization supply element in a display device such as a liquid crystal display device or an organic electroluminescence (EL) display device, and as a polarization detection element. Conventionally, a polarizing plate having a protective film adhered to one side or both sides of a polarizing element has been used.
　偏光板を備えた表示装置は、ノート型パーソナルコンピュータや携帯電話等のモバイル機器にも展開されており、表示目的の多様化、表示区分の明確化、装飾化等への要求から、透過率の異なる領域を有する偏光板が要求されている。特にスマートフォンやタブレット型端末に代表される中小型の携帯端末においては、装飾性の観点から全面にわたって境目のないデザインとするため、全面に偏光板を貼り合わせることがある。この場合、カメラレンズの領域や、画面下のアイコンやロゴ印刷の領域にも偏光板が重なるため、カメラの感度が悪くなったり、意匠性に劣ったりするという問題がある。 Display devices equipped with polarizing plates are also being deployed in mobile devices such as notebook personal computers and mobile phones, and due to demands for diversification of display purposes, clarification of display categories, decoration, etc., the transmittance is high. Polarizing plates with different regions are required. In particular, in small and medium-sized mobile terminals such as smartphones and tablet terminals, a polarizing plate may be attached to the entire surface in order to make the design seamless over the entire surface from the viewpoint of decorativeness. In this case, since the polarizing plate also overlaps the area of the camera lens and the area of the icon or logo printing at the bottom of the screen, there is a problem that the sensitivity of the camera is deteriorated or the design is inferior.
　そのため、偏光板に穴を形成する等の加工を行って、カメラの感度や意匠性の低下を抑制すること、偏光板に含まれる偏光子に化学処理を施すことにより非偏光部を形成して、カメラ性能に悪影響を与えないようにすること（例えば、特許文献１～３）等が知られている。 Therefore, a non-polarized portion is formed by performing processing such as forming a hole in the polarizing plate to suppress deterioration of the sensitivity and design of the camera, and by chemically treating the polarizing element contained in the polarizing plate. , It is known that the camera performance is not adversely affected (for example, Patent Documents 1 to 3).
特開２０１７－１９４５６８号公報JP-A-2017-194568 特開２０１８－２８５６３号公報Japanese Unexamined Patent Publication No. 2018-28563 特開２０１８－３１９５４号公報JP-A-2018-31954
　穴部を有する偏光板は、粘着剤層や接着剤層等の貼合層を介して表示装置をなす部材等に貼合される。穴部を有する偏光板と上記部材との貼合時、空洞である穴部の周辺に気泡が発生したり、該空洞に異物が混入する等の不具合が生じることがある。 The polarizing plate having a hole is bonded to a member or the like forming a display device via a bonding layer such as an adhesive layer or an adhesive layer. When the polarizing plate having a hole is bonded to the member, air bubbles may be generated around the hole, which is a cavity, or foreign matter may be mixed into the cavity.
　本発明は、偏光板を他部材に積層する際に、気泡の発生や異物の混入等の不具合を抑制することができる光学積層体の提供を目的とする。 An object of the present invention is to provide an optical laminate capable of suppressing problems such as generation of air bubbles and mixing of foreign substances when laminating a polarizing plate on another member.
　本発明は、以下の光学積層体を提供する。
　〔１〕　偏光層と、前記偏光層の片面又は両面に設けられる保護層とが積層されており、前記偏光層と前記保護層とを積層方向に貫通する穴部を有する偏光板を含み、
　前記穴部は、透光性の充填材により充填されている、光学積層体。
　〔２〕　前記充填材は、前記穴部全体に設けられている、〔１〕に記載の光学積層体。
　〔３〕　前記充填材は、樹脂を含む、〔１〕又は〔２〕に記載の光学積層体。
　〔４〕　前記偏光板の厚みは、１５μｍ以上である、〔１〕～〔３〕のいずれかに記載の光学積層体。
　〔５〕　前記穴部の径は、０．５ｍｍ以上２０ｍｍ以下である、〔１〕～〔４〕のいずれかに記載の光学積層体。
　〔６〕　さらに、前記偏光板の一方の面側に第１粘着剤層を有する、〔１〕～〔５〕のいずれかに記載の光学積層体。
　〔７〕　さらに、前記第１粘着剤層の前記偏光板とは反対側の面側に、第１剥離フィルムを有する、〔６〕に記載の光学積層体。
　〔８〕　さらに、前記第１粘着剤層の前記偏光板とは反対側の面側に、画像表示素子層を有する、〔６〕に記載の光学積層体。
　〔９〕　さらに、前記偏光板と前記第１粘着剤層との間に、第１機能層を含む、〔６〕～〔８〕のいずれかに記載の光学積層体。
　〔１０〕　前記第１機能層は、光学フィルム及びタッチセンサパネルのうちの少なくとも一方を含む、〔９〕に記載の光学積層体。
　〔１１〕　さらに、前記偏光板の他方の面上に第２粘着剤層を有する、〔６〕～〔１０〕のいずれかに記載の光学積層体。
　〔１２〕　前記充填材は、前記第２粘着剤層を構成する粘着剤と同じ粘着剤である、〔１１〕に記載の光学積層体。
　〔１３〕　さらに、前記第２粘着剤層の前記偏光板とは反対側の面側に、第２剥離フィルムを有する、〔１１〕又は〔１２〕に記載の光学積層体。
　〔１４〕　さらに、前記第２粘着剤層の前記偏光板とは反対側の面側に、第２機能層を有する、〔１１〕又は〔１２〕に記載の光学積層体。
　〔１５〕　前記第２機能層は、タッチセンサパネル及びカバー部材のうちの少なくとも一方を含む、〔１４〕に記載の光学積層体。 The present invention provides the following optical laminates.
[1] The polarizing layer and the protective layer provided on one side or both sides of the polarizing layer are laminated, and include a polarizing plate having a hole portion penetrating the polarizing layer and the protective layer in the stacking direction.
The hole is an optical laminate filled with a translucent filler.
[2] The optical laminate according to [1], wherein the filler is provided in the entire hole portion.
[3] The optical laminate according to [1] or [2], wherein the filler contains a resin.
[4] The optical laminate according to any one of [1] to [3], wherein the thickness of the polarizing plate is 15 μm or more.
[5] The optical laminate according to any one of [1] to [4], wherein the diameter of the hole is 0.5 mm or more and 20 mm or less.
[6] The optical laminate according to any one of [1] to [5], further having a first pressure-sensitive adhesive layer on one surface side of the polarizing plate.
[7] The optical laminate according to [6], further comprising a first release film on the surface side of the first pressure-sensitive adhesive layer opposite to the polarizing plate.
[8] The optical laminate according to [6], further comprising an image display element layer on the surface side of the first pressure-sensitive adhesive layer opposite to the polarizing plate.
[9] The optical laminate according to any one of [6] to [8], further comprising a first functional layer between the polarizing plate and the first pressure-sensitive adhesive layer.
[10] The optical laminate according to [9], wherein the first functional layer includes at least one of an optical film and a touch sensor panel.
[11] The optical laminate according to any one of [6] to [10], further having a second pressure-sensitive adhesive layer on the other surface of the polarizing plate.
[12] The optical laminate according to [11], wherein the filler is the same pressure-sensitive adhesive as the pressure-sensitive adhesive constituting the second pressure-sensitive adhesive layer.
[13] The optical laminate according to [11] or [12], further comprising a second release film on the surface side of the second pressure-sensitive adhesive layer opposite to the polarizing plate.
[14] The optical laminate according to [11] or [12], further comprising a second functional layer on the surface side of the second pressure-sensitive adhesive layer opposite to the polarizing plate.
[15] The optical laminate according to [14], wherein the second functional layer includes at least one of a touch sensor panel and a cover member.
　なお、本明細書において、「第１粘着剤層の偏光板とは反対側の面側に」設けられる層（第１剥離フィルム又は画像表示素子層）は、第１粘着剤層に直接接している場合も、直接接していない場合も含む。「第２粘着剤層の偏光板とは反対側の面側に」設けられる層（第２剥離フィルム又は第２機能層）についても同様である。
　本明細書において、「面上」に設けられる層とは、当該面に接する層をいう。 In the present specification, the layer (first release film or image display element layer) provided "on the surface side of the first pressure-sensitive adhesive layer opposite to the polarizing plate" is in direct contact with the first pressure-sensitive adhesive layer. Including cases where there is direct contact and cases where there is no direct contact. The same applies to the layer (second release film or second functional layer) provided "on the surface side of the second pressure-sensitive adhesive layer opposite to the polarizing plate".
In the present specification, the layer provided "on the surface" means a layer in contact with the surface.
　本発明によれば、穴部を有する偏光板が他部材に積層された構造を有していても、気泡の発生や異物の混入等が少ない光学積層体を提供することができる。 According to the present invention, it is possible to provide an optical laminate having a structure in which a polarizing plate having a hole is laminated on another member, but less bubbles are generated and foreign matter is mixed in.
本発明の光学積層体の一例を模式的に示す概略平面図である。It is a schematic plan view which shows typically an example of the optical laminated body of this invention. 図１に示す光学積層体のｘ－ｘ’断面図である。It is xx'cross-sectional view of the optical laminated body shown in FIG. 本発明の光学積層体の他の一例を模式的に示す概略断面図である。It is the schematic sectional drawing which shows another example of the optical laminated body of this invention schematically. 本発明の光学積層体のさらに他の一例を模式的に示す概略断面図である。It is schematic cross-sectional view which shows still another example of the optical laminated body of this invention schematically. 本発明の光学積層体のさらに他の一例を模式的に示す概略断面図である。It is schematic cross-sectional view which shows still another example of the optical laminated body of this invention schematically. （ａ）及び（ｂ）は、本発明の光学積層体のさらに他の一例を模式的に示す概略断面図である。(A) and (b) are schematic cross-sectional views schematically showing still another example of the optical laminate of the present invention. 本発明の光学積層体のさらに他の一例を模式的に示す概略断面図である。It is schematic cross-sectional view which shows still another example of the optical laminated body of this invention schematically.
　以下、図面を参照して本発明の光学積層体の好ましい実施形態について説明する。以下のすべての図面においては、各構成要素を理解しやすくするために縮尺を適宜調整して示しており、図面に示される各構成要素の縮尺と実際の構成要素の縮尺とは必ずしも一致しない。 Hereinafter, preferred embodiments of the optical laminate of the present invention will be described with reference to the drawings. In all the drawings below, the scale is appropriately adjusted to make it easier to understand each component, and the scale of each component shown in the drawings does not necessarily match the scale of the actual component.
　（光学積層体）
　図１は、本発明の光学積層体の一例を模式的に示す概略平面図である。図２は、図１に示す光学積層体のｘ－ｘ’断面図である。
　図１及び図２に示す光学積層体１は、偏光板１０を有する。
　偏光板１０は、偏光層１１と、偏光層１１の片面又は両面に設けられる保護層１２とが積層されており、偏光層１１と保護層１２とを積層方向に貫通する穴部１５を有する。
　穴部１５は、透光性の充填材により充填されている。 (Optical laminate)
FIG. 1 is a schematic plan view schematically showing an example of the optical laminate of the present invention. FIG. 2 is a cross-sectional view taken along the line xx'of the optical laminate shown in FIG.
The optical laminate 1 shown in FIGS. 1 and 2 has a polarizing plate 10.
The polarizing plate 10 has a polarizing layer 11 and a protective layer 12 provided on one or both sides of the polarizing layer 11 laminated, and has a hole 15 penetrating the polarizing layer 11 and the protective layer 12 in the stacking direction.
The hole 15 is filled with a translucent filler.
　光学積層体１では、偏光板１０の穴部１５に偏光層１１が存在せず、この穴部１５が位置する領域を非偏光領域とすることができる。そのため、光学積層体１をスマートフォンやタブレット型端末等に展開される液晶表示装置や有機ＥＬ表示装置等の表示装置に適用する際に、上記穴部１５が位置する領域に、カメラレンズや、アイコンやロゴ等の印刷部を配置することにより、カメラの感度の低下や意匠性の低下を抑制することができる。 In the optical laminate 1, the polarizing layer 11 does not exist in the hole 15 of the polarizing plate 10, and the region where the hole 15 is located can be a non-polarizing region. Therefore, when the optical laminate 1 is applied to a display device such as a liquid crystal display device or an organic EL display device developed in a smartphone, a tablet type terminal, or the like, a camera lens or an icon is formed in the area where the hole portion 15 is located. By arranging a printing unit such as a logo or a logo, it is possible to suppress a decrease in camera sensitivity and a decrease in design.
　光学積層体１では、偏光板１０の穴部１５が充填材２０によって充填されているため、穴部１５を中実とし空洞が存在しないようにすることができる。これにより、偏光板１０の穴部１５に異物が混入することを抑制することができる。
　また、後述するように、偏光板１０の穴部１５の一方側を塞いだ状態で、穴部１５の他方側が位置する偏光板１０の面上に、剥離フィルム上に粘着剤層が形成された粘着シートや機能層（後述するカバー部材、タッチセンサパネル、光学フィルム等）を積層する場合に、穴部１５に異物が混入したり、穴部１５の周辺に気泡が混入することを抑制することができる。穴部１５が充填材２０により充填されていない場合、異物や気泡の混入を抑制するために真空ブース内で必要に応じて加熱処理も行いながら、上記積層を行う必要がある。これに対し、本実施形態のように穴部１５が充填材２０により充填されていることにより、真空条件下や真空加熱条件下で上記積層を行わなくても、異物や気泡の混入が抑制されやすくなる。 In the optical laminate 1, since the hole 15 of the polarizing plate 10 is filled with the filler 20, the hole 15 can be made solid so that no cavity exists. As a result, it is possible to prevent foreign matter from being mixed into the hole 15 of the polarizing plate 10.
Further, as will be described later, an adhesive layer was formed on the release film on the surface of the polarizing plate 10 on which the other side of the hole 15 is located in a state where one side of the hole 15 of the polarizing plate 10 is closed. When laminating an adhesive sheet or a functional layer (cover member, touch sensor panel, optical film, etc., which will be described later), it is necessary to prevent foreign matter from being mixed into the hole 15 or air bubbles from being mixed around the hole 15. Can be done. When the hole 15 is not filled with the filler 20, it is necessary to perform the above-mentioned lamination while performing heat treatment in the vacuum booth as necessary in order to suppress the mixing of foreign substances and air bubbles. On the other hand, since the hole portion 15 is filled with the filler 20 as in the present embodiment, foreign matter and air bubbles are suppressed from being mixed even if the above lamination is not performed under vacuum conditions or vacuum heating conditions. It will be easier.
　光学積層体１の平面視形状は特に限定されないが、通常、図１に示すように四角形状である。光学積層体１をなす四角形状は、長方形状であってもよく正方形状であってもよく、４つの角のうちの少なくとも１つが角丸（Ｒを有する形状）であってもよい。
　図１に示す光学積層体１は、枚葉体であるが、長尺体であってもよい。光学積層体１は、必要に応じて所定の形状にカットされてもよい。 The plan view shape of the optical laminate 1 is not particularly limited, but is usually a quadrangular shape as shown in FIG. The rectangular shape forming the optical laminate 1 may be rectangular or square, and at least one of the four corners may be rounded (a shape having an R).
The optical laminate 1 shown in FIG. 1 is a single-wafered body, but may be a long body. The optical laminate 1 may be cut into a predetermined shape, if necessary.
　光学積層体１は、片面又は両面にプロテクトフィルムを有していてもよい。プロテクトフィルムは、光学積層体１を用いた製品の製造や、光学積層体１の製造や輸送に際して、偏光板１０の表面に傷や汚れ等が生じることを抑制するために設けられる。プロテクトフィルムは、偏光板１０に対して剥離可能に設けられる。
　プロテクトフィルムは、基材フィルムに粘着剤層を有するものであってもよく、自己粘着性のフィルムであってもよい。
　プロテクトフィルムの基材フィルムに用いられる樹脂としては、後述する保護層に用いられる樹脂が挙げられ、粘着剤層としては、後述する粘着剤が挙げられる。自己粘着性のフィルムは、例えばポリプロピレン系樹脂及びポリエチレン系樹脂等を用いて形成することができる。 The optical laminate 1 may have a protective film on one side or both sides. The protective film is provided in order to prevent scratches, stains, and the like from being generated on the surface of the polarizing plate 10 during the production of a product using the optical laminate 1 and the production and transportation of the optical laminate 1. The protective film is provided so as to be peelable from the polarizing plate 10.
The protective film may be a base film having an adhesive layer, or may be a self-adhesive film.
Examples of the resin used for the base film of the protective film include the resin used for the protective layer described later, and examples of the pressure-sensitive adhesive layer include the pressure-sensitive adhesive described later. The self-adhesive film can be formed by using, for example, a polypropylene-based resin, a polyethylene-based resin, or the like.
　（偏光板）
　偏光板１０は、図２に示すように、偏光層１１と、偏光層１１の両面にそれぞれ設けられた第１保護層１２ａ及び第２保護層１２ｂとを有する。
　第１保護層１２ａ及び第２保護層１２ｂは、粘着剤層や接着剤層等の貼合層を介して偏光層１１上に設けられてもよく、偏光層１１上に貼合層を介さずに直接設けられてもよい。
　偏光板１０は、図２に示す第１保護層１２ａ及び第２保護層１２ｂのうちの一方のみを備えるものであってもよい。 (Polarizer)
As shown in FIG. 2, the polarizing plate 10 has a polarizing layer 11 and a first protective layer 12a and a second protective layer 12b provided on both sides of the polarizing layer 11, respectively.
The first protective layer 12a and the second protective layer 12b may be provided on the polarizing layer 11 via a bonding layer such as an adhesive layer or an adhesive layer, and may be provided on the polarizing layer 11 without a bonding layer. It may be provided directly to.
The polarizing plate 10 may include only one of the first protective layer 12a and the second protective layer 12b shown in FIG.
　偏光板１０は、上記したように偏光層１１と第１保護層１２ａと第２保護層１２ｂとを積層方向に貫通する穴部１５を有する。つまり、偏光層１１、第１保護層１２ａ、及び第２保護層１２ｂも、その厚み方向に貫通する穴部をそれぞれ有する。
　穴部１５の平面形状は特に限定されないが、円形；楕円形；小判形；三角形や四角形等の多角形；多角形の少なくとも１つの角が角丸（Ｒを有する形状）とされた角丸多角形等とすることができる。 As described above, the polarizing plate 10 has a hole portion 15 that penetrates the polarizing layer 11, the first protective layer 12a, and the second protective layer 12b in the stacking direction. That is, the polarizing layer 11, the first protective layer 12a, and the second protective layer 12b also have holes penetrating in the thickness direction thereof.
The planar shape of the hole 15 is not particularly limited, but is circular; oval; oval; polygon such as a triangle or a quadrangle; at least one of the polygons has rounded corners (shape having R). It can be a polygon or the like.
　穴部１５の径は、０．５ｍｍ以上であることが好ましく、１ｍｍ以上であってもよく、２ｍｍ以上であってもよく、３ｍｍ以上であってもよい。穴部１５の径は、２０ｍｍ以下であることが好ましく、１５ｍｍ以下であってもよく、１０ｍｍ以下であってもよく、７ｍｍ以下であってもよい。
　本明細書において、穴部の径とは穴部の平面視形状が円形（真円形）である場合には該円の直径をいい、穴部の平面視形状が円形（真円形）以外の場合には、平面視における穴部の外接円（真円形）の直径をいう。 The diameter of the hole 15 is preferably 0.5 mm or more, and may be 1 mm or more, 2 mm or more, or 3 mm or more. The diameter of the hole 15 is preferably 20 mm or less, may be 15 mm or less, may be 10 mm or less, or may be 7 mm or less.
In the present specification, the diameter of the hole means the diameter of the circle when the plan view shape of the hole is circular (perfect circle), and when the plan view shape of the hole is other than circular (perfect circle). Refers to the diameter of the circumscribing circle (perfect circle) of the hole in the plan view.
　偏光板１０の厚みは、１５μｍ以上であることが好ましく、３０μｍ以上であることがより好ましく、５０μｍ以上であってもよく、６０μｍ以上であってもよく、８０μｍ以上であってもよい。偏光板１０の厚みは、通常３００μｍ以下であり、２５０μｍ以下であってもよく、２００μｍ以下であってもよく、１５０μｍ以下であってもよい。 The thickness of the polarizing plate 10 is preferably 15 μm or more, more preferably 30 μm or more, 50 μm or more, 60 μm or more, or 80 μm or more. The thickness of the polarizing plate 10 is usually 300 μm or less, may be 250 μm or less, may be 200 μm or less, or may be 150 μm or less.
　偏光板１０における穴部１５は、打抜き、切抜き、切削、又はレーザーカット等により形成することができる。 The hole 15 in the polarizing plate 10 can be formed by punching, cutting, cutting, laser cutting, or the like.
　偏光板１０は、穴部１５を１つ有していてもよく、２以上有していてもよい。穴部１５を２以上有する場合、穴部１５の形状や径は、互いに同じであってもよく、互いに異なっていてもよい。 The polarizing plate 10 may have one hole 15 or two or more holes 15. When two or more holes 15 are provided, the shapes and diameters of the holes 15 may be the same or different from each other.
　（偏光層）
　偏光層１１は、無偏光の光を入射させたとき、吸収軸に直交する振動面をもつ直線偏光を透過させる性質を有する直線偏光子である。
　偏光層１１は、例えば、ポリビニルアルコール（以下、「ＰＶＡ」ということがある。）系フィルムに、ヨウ素や二色性染料等の二色性物質による染色処理、延伸処理、及び架橋処理等が施されたものが挙げられる。
　偏光層１１は、重合性液晶化合物に二色性色素を配向させ、重合性液晶化合物を重合させた硬化膜であってもよい。このような偏光層１１は、例えば、基材フィルム上に、重合性液晶化合物及び二色性色素を含む偏光子形成用組成物を塗布し、重合性液晶化合物を液晶状態を保持したまま重合して硬化させて得ることができる。 (Polarizing layer)
The polarizing layer 11 is a linear polarized light having a property of transmitting linearly polarized light having a vibration plane orthogonal to the absorption axis when unpolarized light is incident.
The polarizing layer 11 is formed by, for example, subjecting a polyvinyl alcohol (hereinafter, sometimes referred to as “PVA”) film to a dyeing treatment, a stretching treatment, a cross-linking treatment, or the like with a dichroic substance such as iodine or a dichroic dye. The ones that have been done are listed.
The polarizing layer 11 may be a cured film obtained by orienting a dichroic dye on a polymerizable liquid crystal compound and polymerizing the polymerizable liquid crystal compound. In such a polarizing layer 11, for example, a composition for forming a polarizer containing a polymerizable liquid crystal compound and a dichroic dye is applied onto a base film, and the polymerizable liquid crystal compound is polymerized while maintaining the liquid crystal state. Can be obtained by curing.
　偏光層１１の厚みは、４０μｍ以下とすることができ、好ましくは３０μｍ以下（例えば２０μｍ以下、さらには１５μｍ以下、なおさらには１０μｍ以下又は８μｍ以下）である。偏光層１１の厚みは、通常２μｍ以上であり、５μｍ以上であってもよい。 The thickness of the polarizing layer 11 can be 40 μm or less, preferably 30 μm or less (for example, 20 μm or less, further 15 μm or less, and further 10 μm or less or 8 μm or less). The thickness of the polarizing layer 11 is usually 2 μm or more, and may be 5 μm or more.
　（保護層）
　偏光層１１の片面又は両面に設けられる保護層１２（第１保護層１２ａ、第２保護層１２ｂ）としては、光を透過可能な樹脂層であれば限定されず、樹脂フィルムであってもよく、樹脂を含む組成物を塗布して形成した塗布層であってもよい。 (Protective layer)
The protective layer 12 (first protective layer 12a, second protective layer 12b) provided on one side or both sides of the polarizing layer 11 is not limited as long as it is a resin layer capable of transmitting light, and may be a resin film. , It may be a coating layer formed by coating a composition containing a resin.
　樹脂層に用いられる樹脂としては、透明性、機械的強度、熱安定性、水分遮断性、等方性、延伸性等に優れる熱可塑性樹脂であることが好ましい。このような熱可塑性樹脂としては、例えば、トリアセチルセルロース等のセルロース系樹脂；ポリエチレンテレフタレート、ポリエチレンナフタレート等のポリエステル系樹脂；ポリエーテルスルホン系樹脂；ポリスルホン系樹脂；ポリカーボネート系樹脂；ナイロンや芳香族ポリアミド等のポリアミド系樹脂；ポリイミド系樹脂；ポリエチレン、ポリプロピレン、エチレン・プロピレン共重合体等のポリオレフィン系樹脂；シクロ系及びノルボルネン構造を有する環状ポリオレフィン系樹脂）；（メタ）アクリル系樹脂；ポリアリレート系樹脂；ポリスチレン系樹脂；ポリビニルアルコール系樹脂、並びにこれらの混合物が挙げられる。
　偏光層１１の両面にそれぞれ保護層１２が積層されている場合、保護層１２の樹脂組成は、互いに同一であってもよく、互いに異なっていてもよい。 The resin used for the resin layer is preferably a thermoplastic resin having excellent transparency, mechanical strength, thermal stability, moisture blocking property, isotropic property, stretchability and the like. Examples of such thermoplastic resins include cellulose resins such as triacetyl cellulose; polyester resins such as polyethylene terephthalate and polyethylene naphthalate; polyether sulfone resins; polysulfone resins; polycarbonate resins; nylons and aromatics. Polyamide-based resin such as polyamide; Polyethylene-based resin; Polyethylene-based resin such as polyethylene, polypropylene, ethylene / propylene copolymer; Cyclic polyolefin-based resin having cyclo-based and norbornene structure); (Meta) acrylic-based resin; Polyallylate-based Resins; polystyrene-based resins; polyvinyl alcohol-based resins, and mixtures thereof.
When the protective layers 12 are laminated on both sides of the polarizing layer 11, the resin compositions of the protective layers 12 may be the same or different from each other.
　保護層１２が樹脂フィルムである場合、偏光層１１上に、貼合層を介して保護層１２を設けることができる。貼合層を構成する粘着剤及び接着剤は、後述する粘着剤及び接着剤を用いることができる。
　保護層１２が塗布層である場合、偏光層１１上に、上記した樹脂を含む組成物を塗布することによって形成することができる。 When the protective layer 12 is a resin film, the protective layer 12 can be provided on the polarizing layer 11 via a bonding layer. As the pressure-sensitive adhesive and the adhesive constituting the bonding layer, the pressure-sensitive adhesive and the adhesive described later can be used.
When the protective layer 12 is a coating layer, it can be formed by coating the composition containing the above-mentioned resin on the polarizing layer 11.
　保護層１２の厚みは、薄型化の観点から、通常２００μｍ以下であり、１５０μｍ以下であることが好ましく、１００μｍ以下であることがより好ましく、８０μｍ以下であってもよく、６０μｍ以下であってもよい。保護層１２の厚みは、通常５μｍ以上であり、１０μｍ以上であってもよく、２０μｍ以上であってもよい。保護層１２は位相差を有していても、有していなくてもよい。
　偏光層１１の両面にそれぞれ保護層１２が積層されている場合、保護層１２の厚みは、互いに同一であってもよく、互いに異なっていてもよい。 From the viewpoint of thinning, the thickness of the protective layer 12 is usually 200 μm or less, preferably 150 μm or less, more preferably 100 μm or less, 80 μm or less, or 60 μm or less. Good. The thickness of the protective layer 12 is usually 5 μm or more, may be 10 μm or more, or may be 20 μm or more. The protective layer 12 may or may not have a phase difference.
When the protective layers 12 are laminated on both surfaces of the polarizing layer 11, the thicknesses of the protective layers 12 may be the same or different from each other.
　（充填材）
　偏光板１０の穴部１５は、充填材２０により充填されている。充填材２０は、通常、穴部１５全体を埋めるように設けられる。
　充填材２０は透光性を有する。本明細書において、透光性とは波長４００ｎｍ～７００ｎｍの範囲の可視光が８０％以上透過する性質をいう。充填材２０の透光性は、上記波長領域の可視光が８５％以上透過するものであってもよく、９０％以上透過するものであってもよく、９５％以上透過するものであってもよい。 (Filler)
The hole 15 of the polarizing plate 10 is filled with the filler 20. The filler 20 is usually provided so as to fill the entire hole 15.
The filler 20 has translucency. In the present specification, translucency means a property that 80% or more of visible light in the wavelength range of 400 nm to 700 nm is transmitted. The translucency of the filler 20 may be such that visible light in the above wavelength region transmits 85% or more, 90% or more, or 95% or more. Good.
　充填材２０は透光性を有し、偏光板１０の穴部１５を埋めることができるものであれば特に限定されないが、樹脂を含むことが好ましい。
　当該樹脂としては、例えば、粘着剤、接着剤、及び熱可塑性樹脂からなる群より選ばれる１種以上が挙げられる。 The filler 20 is not particularly limited as long as it has translucency and can fill the hole 15 of the polarizing plate 10, but it preferably contains a resin.
Examples of the resin include one or more selected from the group consisting of adhesives, adhesives, and thermoplastic resins.
　粘着剤は、それ自体を被着体に貼り付けることで接着性を発現するものであり、いわゆる感圧型接着剤と称されるものである。
　粘着剤としては、（メタ）アクリル系ポリマー、シリコーン系ポリマー、ポリエステル系ポリマー、ポリウレタン系ポリマー、ポリエーテル系ポリマー、又はゴム系ポリマー等のポリマーを主成分として含むものが挙げられる。本明細書において、主成分とは、粘着剤の全固形分のうち５０質量％以上を含む成分をいう。粘着剤は、活性エネルギー線硬化型、熱硬化型であってもよく、活性エネルギー線照射や加熱により、架橋度や接着力を調整してもよい。
　本明細書において「（メタ）アクリル」とは、アクリル又はメタクリルのいずれでもよいことを意味する。 The pressure-sensitive adhesive exhibits adhesiveness by sticking itself to an adherend, and is a so-called pressure-sensitive adhesive.
Examples of the pressure-sensitive adhesive include those containing a polymer such as a (meth) acrylic polymer, a silicone polymer, a polyester polymer, a polyurethane polymer, a polyether polymer, or a rubber polymer as a main component. In the present specification, the main component means a component containing 50% by mass or more of the total solid content of the pressure-sensitive adhesive. The pressure-sensitive adhesive may be an active energy ray-curable type or a thermosetting type, and the degree of cross-linking and the adhesive strength may be adjusted by irradiation with active energy rays or heating.
As used herein, the term "(meth) acrylic" means that it may be either acrylic or methacrylic.
　粘着剤は、透明性、粘着力、信頼性、耐候性、耐熱性等の観点から、（メタ）アクリル系粘着剤が好ましい。（メタ）アクリル系粘着剤には、メチル基やエチル基やｎ－、ｉ－又はｔ－ブチル基等の炭素数が２０以下のアルキル基を有する（メタ）アクリル酸アルキルエステルと、（メタ）アクリル酸や（メタ）アクリル酸ヒドロキシエチル等の官能基含有（メタ）アクリル系モノマーとを、ガラス転移温度が好ましくは２５℃以下、より好ましくは０℃以下となるように配合した、重量平均分子量が１０万以上の（メタ）アクリル系ポリマーが主成分として有用である。 As the adhesive, a (meth) acrylic adhesive is preferable from the viewpoint of transparency, adhesive strength, reliability, weather resistance, heat resistance, and the like. The (meth) acrylic pressure-sensitive adhesive includes a (meth) acrylic acid alkyl ester having an alkyl group having 20 or less carbon atoms such as a methyl group, an ethyl group, an n-, i- or t-butyl group, and (meth). A weight average molecular weight of a functional group-containing (meth) acrylic monomer such as acrylic acid or hydroxyethyl (meth) acrylic acid blended so that the glass transition temperature is preferably 25 ° C. or lower, more preferably 0 ° C. or lower. A (meth) acrylic polymer having a value of 100,000 or more is useful as a main component.
　接着剤は、硬化性の樹脂成分を含むもの（いわゆる、硬化性樹脂）であって、感圧型接着剤（粘着剤）以外の接着剤である。
　接着剤としては、硬化性の樹脂成分を水に溶解又は分散させた水系接着剤、活性エネルギー線硬化性化合物を含有する活性エネルギー線硬化性接着剤、熱硬化性接着剤等が挙げられる。 The adhesive contains a curable resin component (so-called curable resin), and is an adhesive other than a pressure-sensitive adhesive (adhesive).
Examples of the adhesive include an aqueous adhesive in which a curable resin component is dissolved or dispersed in water, an active energy ray-curable adhesive containing an active energy ray-curable compound, and a thermosetting adhesive.
　水系接着剤に含有される樹脂成分としては、ポリビニルアルコール系樹脂やウレタン系樹脂等が挙げられる。
　活性エネルギー線硬化性接着剤としては、紫外線、可視光、電子線、Ｘ線等の活性エネルギー線の照射によって硬化する組成物が挙げられる。活性エネルギー線の照射によって硬化する組成物としては、紫外線硬化性組成物であることが好ましく、カチオン重合によって硬化するエポキシ系化合物を硬化性成分として含有することがより好ましい。
　熱硬化性接着剤としては、エポキシ系樹脂、シリコーン系樹脂、フェノール系樹脂、メラミン系樹脂等を主成分として含むものが挙げられる。 Examples of the resin component contained in the water-based adhesive include polyvinyl alcohol-based resin and urethane-based resin.
Examples of the active energy ray-curable adhesive include compositions that are cured by irradiation with active energy rays such as ultraviolet rays, visible light, electron beams, and X-rays. The composition that is cured by irradiation with active energy rays is preferably an ultraviolet curable composition, and more preferably contains an epoxy compound that is cured by cationic polymerization as a curable component.
Examples of the thermosetting adhesive include those containing an epoxy resin, a silicone resin, a phenol resin, a melamine resin, or the like as a main component.
　熱可塑性樹脂としては、鎖状ポリオレフィン系樹脂（ポリプロピレン系樹脂等）、環状ポリオレフィン系樹脂（ノルボルネン系樹脂等）等のポリオレフィン系樹脂；トリアセチルセルロース、ジアセチルセルロース等のセルロースエステル系樹脂；ポリエチレンテレフタレート、ポリエチレンナフタレート、ポリブチレンテレフタレート等のポリエステル系樹脂；ポリカーボネート系樹脂；（メタ）アクリル系樹脂；ポリスチレン系樹脂等を挙げることができる。熱可塑性樹脂は、例えば、３Ｄプリンタ等で用いられるフィラメント状の熱可塑性樹脂であってもよい。 Examples of the thermoplastic resin include polyolefin resins such as chain polyolefin resins (polypropylene resins, etc.) and cyclic polyolefin resins (norbornene resins, etc.); cellulose ester resins such as triacetyl cellulose and diacetyl cellulose; polyethylene terephthalates, Polyester-based resins such as polyethylene naphthalate and polybutylene terephthalate; polycarbonate-based resins; (meth) acrylic-based resins; polystyrene-based resins and the like can be mentioned. The thermoplastic resin may be, for example, a filamentous thermoplastic resin used in a 3D printer or the like.
　上記粘着剤、接着剤、又は熱可塑性樹脂を、液状、微粒子状、又は粉末状等の流動性を有する状態で偏光板１０の穴部１５に注入し、注入後に必要に応じて、液状の場合は乾燥又は硬化させることによって、微粒子状又は粉末状の場合は溶融固化等させることによって、穴部１５に上記充填材２０を充填することができる。
　あるいは、上記粘着剤、接着剤、又は熱可塑性樹脂を、上記穴部１５の形状に合わせて成形した成形物を予め形成しておき、この成形物に偏光板１０の穴部１５を嵌め込むことによって、上記充填材２０を充填してもよい。この場合、成形物を、穴部１５の形状と同じサイズに形成する、又は、穴部１５のサイズよりも０ｍｍ超０．２ｍｍ以下小さいサイズに形成することが好ましい。 When the above-mentioned pressure-sensitive adhesive, adhesive, or thermoplastic resin is injected into the hole 15 of the polarizing plate 10 in a state of fluidity such as liquid, fine particles, or powder, and if necessary after injection, in a liquid state. Can be filled with the filler 20 in the hole 15 by drying or curing, and in the case of fine particles or powder, by melting and solidifying.
Alternatively, a molded product obtained by molding the pressure-sensitive adhesive, adhesive, or thermoplastic resin according to the shape of the hole portion 15 is formed in advance, and the hole portion 15 of the polarizing plate 10 is fitted into the molded product. The filler 20 may be filled according to the above. In this case, it is preferable to form the molded product in the same size as the shape of the hole portion 15, or to form the molded product in a size more than 0 mm and 0.2 mm or less smaller than the size of the hole portion 15.
　（光学積層体の他の例［１］）
　図３は、本発明の光学積層体の他の一例を模式的に示す概略断面図である。
　図３に示す光学積層体２は、図２に示す光学積層体１の一方の面側に、さらに第１粘着剤層３１及び第１剥離フィルム３２をこの順に有する。
　第１粘着剤層３１は、図３に示すように偏光板１０の第２保護層１２ｂ上に設けてもよく、第１保護層１２ａ上に設けてもよい。
　偏光板１０が片面にのみ保護層１２を有する場合は、保護層１２上又は偏光層１１上に第１粘着剤層３１及び第１剥離フィルム３２をこの順に設けることができる。
　第１粘着剤層３１は、図３に示すように、偏光板１０に直接接するように設けられてもよく、後述するように、偏光板１０の保護層として設けられた第１機能層（光学フィルム、タッチセンサパネル等）上に直接接するように設けられてもよい。 (Other Examples of Optical Laminates [1])
FIG. 3 is a schematic cross-sectional view schematically showing another example of the optical laminate of the present invention.
The optical laminate 2 shown in FIG. 3 further has a first pressure-sensitive adhesive layer 31 and a first release film 32 on one surface side of the optical laminate 1 shown in FIG. 2 in this order.
As shown in FIG. 3, the first pressure-sensitive adhesive layer 31 may be provided on the second protective layer 12b of the polarizing plate 10, or may be provided on the first protective layer 12a.
When the polarizing plate 10 has the protective layer 12 on only one side, the first pressure-sensitive adhesive layer 31 and the first release film 32 can be provided on the protective layer 12 or the polarizing layer 11 in this order.
As shown in FIG. 3, the first pressure-sensitive adhesive layer 31 may be provided so as to be in direct contact with the polarizing plate 10, and as will be described later, the first functional layer (optical) provided as a protective layer of the polarizing plate 10. It may be provided so as to be in direct contact with the film, the touch sensor panel, etc.).
　第１粘着剤層３１は、後述する画像表示素子層と貼合するための貼合層として用いることができる。
　第１粘着剤層３１は、偏光板１０の穴部１５が位置する領域に、該層の積層方向に貫通する穴部を有していてもよい。この場合、光学積層体２において、第１粘着剤層３１の穴部は充填材２０で充填されていることが好ましい。光学積層体２において、偏光板１０の穴部１５を充填する充填材２０として、第１粘着剤層３１を構成する粘着剤を用いてもよい。 The first pressure-sensitive adhesive layer 31 can be used as a bonding layer for bonding with an image display element layer described later.
The first pressure-sensitive adhesive layer 31 may have a hole portion penetrating in the stacking direction of the layer in the region where the hole portion 15 of the polarizing plate 10 is located. In this case, in the optical laminate 2, the holes of the first pressure-sensitive adhesive layer 31 are preferably filled with the filler 20. In the optical laminate 2, the pressure-sensitive adhesive constituting the first pressure-sensitive adhesive layer 31 may be used as the filler 20 for filling the hole 15 of the polarizing plate 10.
　第１剥離フィルム３２は、第１粘着剤層３１の偏光板１０側とは反対側の表面を被覆し保護するために用いることができる。第１剥離フィルム３２は、第１粘着剤層３１に対して剥離可能である。
　第１剥離フィルム３２は、偏光板１０の穴部１５が位置する領域に穴部を有していない。 The first release film 32 can be used to coat and protect the surface of the first pressure-sensitive adhesive layer 31 on the side opposite to the polarizing plate 10 side. The first release film 32 can be peeled off from the first pressure-sensitive adhesive layer 31.
The first release film 32 does not have a hole in the region where the hole 15 of the polarizing plate 10 is located.
　光学積層体２において、偏光板１０が片面にのみ保護層を有する場合、第１粘着剤層３１が設けられない側に保護層（図３では、第１保護層１２ａ）を有することが好ましい。
　光学積層体２は、第１剥離フィルム３２を有していなくてもよい。 In the optical laminate 2, when the polarizing plate 10 has a protective layer on only one side, it is preferable to have a protective layer (first protective layer 12a in FIG. 3) on the side where the first adhesive layer 31 is not provided.
The optical laminate 2 does not have to have the first release film 32.
　光学積層体２は、例えば、上記した偏光板１０に、第１剥離フィルム３２上に第１粘着剤層３１を設けた第１粘着シートを積層した後、この穴部１５を充填材２０で充填することにより得ることができる。 In the optical laminate 2, for example, a first pressure-sensitive adhesive sheet provided with a first pressure-sensitive adhesive layer 31 on a first release film 32 is laminated on the above-mentioned polarizing plate 10, and then the holes 15 are filled with a filler 20. Can be obtained by doing.
　光学積層体２は、穴部１５が形成されていない偏光板に、上記第１粘着シートを積層した後、該偏光板にのみ穴部１５を形成し、穴部１５を充填材２０で充填することにより得ることもできる。 In the optical laminate 2, after laminating the first pressure-sensitive adhesive sheet on a polarizing plate in which the hole portion 15 is not formed, the hole portion 15 is formed only in the polarizing plate, and the hole portion 15 is filled with the filler 20. It can also be obtained by
　光学積層体２は、上記光学積層体１（図２）に、上記第１粘着シートを積層して得てもよい。 The optical laminate 2 may be obtained by laminating the first adhesive sheet on the optical laminate 1 (FIG. 2).
　光学積層体２は、次の手順で得ることもできる。まず、穴部１５が形成されていない偏光板に、離型フィルム上に第１粘着剤層３１を設けた粘着シートを積層することにより積層体（１）を得る。続いて、偏光板１０の穴部１５を形成するために、積層体（１）全体を積層方向に貫通する穴部を形成した後、離型フィルムを剥離し、該剥離により露出した第１粘着剤層３１上に第１剥離フィルム３２を積層することにより積層体（２）を得る。更に、積層体（２）が有する穴部を充填材２０で充填することにより、光学積層体２を得る。 The optical laminate 2 can also be obtained by the following procedure. First, a laminated body (1) is obtained by laminating an adhesive sheet provided with the first adhesive layer 31 on a release film on a polarizing plate in which the hole portion 15 is not formed. Subsequently, in order to form the hole portion 15 of the polarizing plate 10, a hole portion that penetrates the entire laminated body (1) in the lamination direction is formed, and then the release film is peeled off, and the first adhesive exposed by the peeling is peeled off. The laminated body (2) is obtained by laminating the first release film 32 on the agent layer 31. Further, the optical laminate 2 is obtained by filling the holes of the laminate (2) with the filler 20.
　光学積層体２は、次の手順で得ることもできる。まず、充填材で充填されていない穴部１５を有する偏光板１０の第１保護層１２ａ側にプロテクトフィルムを積層する。次に、当該穴部１５内に充填材２０の材料を注入し、更に、偏光板１０のプロテクトフィルムとは反対側の面に、第１粘着剤層３１を形成するための粘着剤を塗工する。その後、塗工した粘着剤と上記充填材２０の材料とを同時に加熱することにより硬化させる。この硬化によって、偏光板１０のプロテクトフィルムとは反対側の面に第１粘着剤層３１を形成し、第１粘着剤層３１の偏光板１０とは反対側の面に、第１剥離フィルム３２を積層する。偏光板１０に積層されたプロテクトフィルムは、必要に応じて剥離して除去することができる。
　充填材２０を構成する材料が粘着剤である場合、偏光板の穴部への粘着剤の注入と、偏光板への粘着剤の塗工とは、同時に行ってもよい。 The optical laminate 2 can also be obtained by the following procedure. First, a protective film is laminated on the first protective layer 12a side of the polarizing plate 10 having holes 15 that are not filled with the filler. Next, the material of the filler 20 is injected into the hole 15, and an adhesive for forming the first adhesive layer 31 is further applied to the surface of the polarizing plate 10 on the opposite side of the protective film. To do. Then, the applied pressure-sensitive adhesive and the material of the filler 20 are simultaneously heated to be cured. By this curing, the first pressure-sensitive adhesive layer 31 is formed on the surface of the polarizing plate 10 opposite to the protective film, and the first release film 32 is formed on the surface of the first pressure-sensitive adhesive layer 31 opposite to the polarizing plate 10. Are laminated. The protective film laminated on the polarizing plate 10 can be peeled off and removed as needed.
When the material constituting the filler 20 is a pressure-sensitive adhesive, the injection of the pressure-sensitive adhesive into the holes of the polarizing plate and the coating of the pressure-sensitive adhesive on the polarizing plate may be performed at the same time.
　第１粘着剤層３１は粘着剤を用いて形成され、粘着剤としては上記したものを用いることができる。 The first pressure-sensitive adhesive layer 31 is formed by using a pressure-sensitive adhesive, and the above-mentioned pressure-sensitive adhesive can be used.
　第１粘着剤層３１の厚みは特に限定されず、１０μｍ以上であってもよく、１５μｍ以上であってもよく、２０μｍ以上であってもよい。第１粘着剤層３１の厚みは、通常５０μｍ以下であり、４０μｍ以下であってもよく、３０μｍ以下であってもよく、２５μｍ以下であってもよい。 The thickness of the first pressure-sensitive adhesive layer 31 is not particularly limited, and may be 10 μm or more, 15 μm or more, or 20 μm or more. The thickness of the first pressure-sensitive adhesive layer 31 is usually 50 μm or less, may be 40 μm or less, may be 30 μm or less, or may be 25 μm or less.
　第１剥離フィルム３２としては、例えば、第１粘着剤層３１と接する側に離型処理を施した樹脂フィルムを用いることができる。
　樹脂フィルムとしては、ポリエチレン等のポリエチレン系樹脂、ポリプロピレン等のポリプロピレン系樹脂、ポリエチレンテレフタレート等のポリエステル系樹脂等からなるフィルムが挙げられる。
　離型処理としては、シリコーンコーティング等が挙げられる。 As the first release film 32, for example, a resin film having a mold release treatment on the side in contact with the first pressure-sensitive adhesive layer 31 can be used.
Examples of the resin film include a film made of a polyethylene resin such as polyethylene, a polypropylene resin such as polypropylene, and a polyester resin such as polyethylene terephthalate.
Examples of the mold release treatment include silicone coating and the like.
　第１剥離フィルム３２の厚みは特に限定されず、２０μｍ以上であってもよく、２５μｍ以上であってもよく、通常５０μｍ以下であり、４０μｍ以下であってもよく、３０μｍ以下であってもよい。 The thickness of the first release film 32 is not particularly limited, and may be 20 μm or more, 25 μm or more, usually 50 μm or less, 40 μm or less, or 30 μm or less. ..
　離型フィルムは、第１剥離フィルム３２で例示したものを用いることができる。 As the release film, the one exemplified in the first release film 32 can be used.
　（光学積層体の他の例［２］）
　図４は、本発明の光学積層体のさらに他の一例を模式的に示す概略断面図である。
　図４に示す光学積層体３は、図３に示す光学積層体２の第１保護層１２ａ（偏光板１０の他方の面）上に、第２粘着剤層４１及び第２剥離フィルム４２をこの順に有する。第２粘着剤層４１は、光学積層体２の偏光板１０に直接接するように設けられる。 (Other Examples of Optical Laminates [2])
FIG. 4 is a schematic cross-sectional view schematically showing still another example of the optical laminate of the present invention.
The optical laminate 3 shown in FIG. 4 has a second adhesive layer 41 and a second release film 42 mounted on the first protective layer 12a (the other surface of the polarizing plate 10) of the optical laminate 2 shown in FIG. Have in order. The second pressure-sensitive adhesive layer 41 is provided so as to be in direct contact with the polarizing plate 10 of the optical laminate 2.
　第２粘着剤層４１は、後述する第２機能層（カバー部材、タッチセンサパネル等）と貼合するための貼合層として用いることができる。 The second adhesive layer 41 can be used as a bonding layer for bonding with a second functional layer (cover member, touch sensor panel, etc.) described later.
　第２剥離フィルム４２は、第２粘着剤層４１の偏光板１０側とは反対側の表面を被覆し保護するために用いることができる。第２剥離フィルム４２は、第２粘着剤層４１に対して剥離可能である。
　光学積層体３は、第２剥離フィルム４２を有していなくてもよい。 The second release film 42 can be used to coat and protect the surface of the second pressure-sensitive adhesive layer 41 on the side opposite to the polarizing plate 10 side. The second release film 42 can be peeled off from the second pressure-sensitive adhesive layer 41.
The optical laminate 3 does not have to have the second release film 42.
　図４に示す光学積層体３では、偏光板１０の穴部１５に充填材２０が設けられているため、高温環境下（例えば、温度８５℃、１００時間）に置いた場合等に、第２粘着剤層４１の剥がれや光漏れ等の不具合を抑制することができる。 In the optical laminate 3 shown in FIG. 4, since the filler 20 is provided in the hole 15 of the polarizing plate 10, the second member is placed in a high temperature environment (for example, at a temperature of 85 ° C. for 100 hours). Problems such as peeling of the pressure-sensitive adhesive layer 41 and light leakage can be suppressed.
　光学積層体３において、充填材２０は、第２粘着剤層４１を構成する粘着剤と同じ粘着剤であることが好ましい。充填材２０を構成する粘着剤と第１粘着剤層３１を構成する粘着剤とを同じ材料とすることにより、光学積層体３の製造を効率的に行うことができる。これにより、光学積層体３を表示装置に適用する際に、上記穴部１５が位置する領域に、カメラレンズ、又は、アイコンやロゴ等の印刷部を配置した場合のカメラの感度の低下や意匠性の低下等を抑制することができる。 In the optical laminate 3, the filler 20 is preferably the same adhesive as the adhesive constituting the second adhesive layer 41. By using the same material as the pressure-sensitive adhesive constituting the filler 20 and the pressure-sensitive adhesive constituting the first pressure-sensitive adhesive layer 31, the optical laminate 3 can be efficiently manufactured. As a result, when the optical laminate 3 is applied to the display device, the sensitivity of the camera is reduced and the design is reduced when the camera lens or the printing portion such as an icon or logo is arranged in the area where the hole portion 15 is located. It is possible to suppress deterioration of sex.
　光学積層体３は、例えば、上記した光学積層体２の偏光板１０上に、第２剥離フィルム４２上に第２粘着剤層４１を設けた第２粘着シートを積層することによって得ることができる。 The optical laminate 3 can be obtained, for example, by laminating a second adhesive sheet provided with a second adhesive layer 41 on a second release film 42 on the polarizing plate 10 of the optical laminate 2 described above. ..
　光学積層体２（図３）を用いて第２粘着シートとの積層を行うため、光学積層体２と第２粘着シートとの積層に際して、穴部１５に異物が混入したり、穴部１５の周辺に気泡が混入することを抑制することができる。
　特に、光学積層体２では、第１粘着剤層３１及び第１剥離フィルム３２が設けられており、穴部１５の一方側が第１粘着剤層３１や第１剥離フィルム３２によって塞がれている。空洞の穴部を有する光学積層体２と第２粘着シートとを積層させる場合には、穴部に異物が混入したり穴部の周辺に気泡が生じないように、真空条件下又は真空加熱条件下で第２粘着シートと積層する必要がある。これに対し、穴部が充填材２０により充填された光学積層体２と第２粘着シートとを積層する場合、真空条件下又は真空加熱条件下で積層しなくても、異物や気泡の混入を抑制することができる。ただし、光学積層体２と第２粘着シートとの貼合面における異物や気泡の混入をより一層抑制するために、光学積層体２と第２粘着シートとの積層を真空条件下や真空加熱条件下で行ってもよい。 Since the optical laminate 2 (FIG. 3) is used for laminating with the second adhesive sheet, foreign matter may be mixed into the hole 15 or the hole 15 may be laminated when the optical laminate 2 and the second adhesive sheet are laminated. It is possible to prevent air bubbles from being mixed in the surrounding area.
In particular, in the optical laminate 2, the first pressure-sensitive adhesive layer 31 and the first release film 32 are provided, and one side of the hole 15 is closed by the first pressure-sensitive adhesive layer 31 and the first release film 32. .. When the optical laminate 2 having a hollow hole and the second adhesive sheet are laminated, vacuum conditions or vacuum heating conditions are used so that foreign matter does not get mixed in the hole or bubbles are not generated around the hole. It needs to be laminated with the second adhesive sheet below. On the other hand, when the optical laminate 2 whose holes are filled with the filler 20 and the second adhesive sheet are laminated, foreign matter and air bubbles are mixed even if they are not laminated under vacuum conditions or vacuum heating conditions. It can be suppressed. However, in order to further suppress the mixing of foreign substances and air bubbles on the bonding surface between the optical laminate 2 and the second adhesive sheet, the optical laminate 2 and the second adhesive sheet are laminated under vacuum conditions or vacuum heating conditions. You may go below.
　光学積層体３が長尺体である場合、光学積層体２（図３）と第２粘着シートとの積層は、通常連続的に行われる。空洞の穴部を有する光学積層体を用いた場合、空洞の穴部がない光学積層体を用いた場合に比較すると、上記した異物や気泡の混入が抑制されるように第２粘着シートを積層する速度を遅くする必要がある。
　穴部が充填材２０で充填された光学積層体２を用いることにより、光学積層体２と第２粘着シートとの積層を、空洞の穴部がない光学積層体を用いた場合と同程度の速度で行うことができる。 When the optical laminate 3 is a long body, the optical laminate 2 (FIG. 3) and the second adhesive sheet are usually continuously laminated. When an optical laminate having a hollow hole is used, the second adhesive sheet is laminated so as to suppress the above-mentioned foreign matter and air bubbles from being mixed as compared with the case where an optical laminate without a hollow hole is used. You need to slow down the speed.
By using the optical laminate 2 in which the holes are filled with the filler 20, the lamination of the optical laminate 2 and the second adhesive sheet is about the same as in the case of using the optical laminate having no hollow holes. It can be done at speed.
　第２粘着剤層４１は、粘着剤を用いて形成することができる。粘着剤としては、上記したものを用いることができる。 The second pressure-sensitive adhesive layer 41 can be formed by using a pressure-sensitive adhesive. As the pressure-sensitive adhesive, the above-mentioned ones can be used.
　光学積層体３において、充填材２０が第２粘着剤層４１を構成する粘着剤と同じ粘着剤である場合、光学積層体２（図３）と第２粘着シートとの積層は、加熱条件下（例えば、温度５０℃～７０℃の条件下）で行うことが好ましい。加熱条件下で貼合を行うことにより、第２粘着剤層４１を構成する粘着剤と充填材２０を構成する粘着剤と同化（一体化）しやすい。これにより、第２粘着剤層４１と充填材２０との境界を判別しにくくすることができるため、充填材２０と第２粘着剤層４１とが接する部分において屈折率が変化することを抑制できる。 In the optical laminate 3, when the filler 20 is the same adhesive as the adhesive constituting the second adhesive layer 41, the lamination of the optical laminate 2 (FIG. 3) and the second adhesive sheet is performed under heating conditions. (For example, the condition of the temperature of 50 ° C. to 70 ° C.) is preferable. By laminating under heating conditions, it is easy to assimilate (integrate) the pressure-sensitive adhesive constituting the second pressure-sensitive adhesive layer 41 and the pressure-sensitive adhesive constituting the filler 20. As a result, it is possible to make it difficult to distinguish the boundary between the second pressure-sensitive adhesive layer 41 and the filler layer 20, so that it is possible to suppress a change in the refractive index at the portion where the filler layer 20 and the second pressure-sensitive adhesive layer 41 are in contact with each other. ..
　光学積層体３は、次の手順で得ることもできる。
　まず、空洞の穴部１５を有する偏光板１０に、第１剥離フィルム３２上に第１粘着剤層３１を設けた第１粘着シートを積層する。次に、偏光板１０の穴部１５を埋めるように充填材２０の材料を注入し、更に、偏光板１０の第１粘着シートとは反対側の面側に、第２粘着剤層４１を形成するための粘着剤を塗工する。その後、塗工した粘着剤と上記充填材２０の材料とを同時に加熱することにより硬化させる。この硬化によって、偏光板１０の第１粘着シートとは反対側の面側に第２粘着剤層４１を形成し、第２粘着剤層４１の偏光板１０とは反対側の面側に、第２剥離フィルム４２を積層する。
　充填材２０を構成する材料が粘着剤である場合、偏光板の穴部への粘着剤の注入と、第２粘着剤層４１を形成するための粘着剤の塗工とは、同時に行ってもよい。 The optical laminate 3 can also be obtained by the following procedure.
First, a first pressure-sensitive adhesive sheet provided with a first pressure-sensitive adhesive layer 31 on a first release film 32 is laminated on a polarizing plate 10 having a hollow hole portion 15. Next, the material of the filler 20 is injected so as to fill the hole 15 of the polarizing plate 10, and the second pressure-sensitive adhesive layer 41 is further formed on the surface side of the polarizing plate 10 opposite to the first pressure-sensitive adhesive sheet. Apply adhesive to make it. Then, the applied pressure-sensitive adhesive and the material of the filler 20 are simultaneously heated to be cured. By this curing, a second pressure-sensitive adhesive layer 41 is formed on the surface side of the polarizing plate 10 opposite to the first pressure-sensitive adhesive sheet, and a second pressure-sensitive adhesive layer 41 is formed on the surface side of the second pressure-sensitive adhesive layer 41 opposite to the polarizing plate 10. 2 The release film 42 is laminated.
When the material constituting the filler 20 is an adhesive, the injection of the adhesive into the hole of the polarizing plate and the coating of the adhesive for forming the second adhesive layer 41 may be performed at the same time. Good.
　光学積層体３は、次の手順で得ることもできる。
　まず、空洞の穴部１５を有する偏光板１０に、第２剥離フィルム４２上に第２粘着剤層４１を設けた第２粘着シートを積層する。次に、偏光板１０の穴部１５を埋めるように充填材２０の材料を注入し、更に、偏光板１０の第２粘着シートとは反対側の面側に、第１粘着剤層３１を形成するための粘着剤を塗工する。その後、塗工した粘着剤と上記充填材２０の材料とを同時に加熱することにより硬化させる。この硬化によって、偏光板１０の第２粘着シートとは反対側の面側に第１粘着剤層３１を形成し、第１粘着剤層３１の偏光板１０とは反対側の面側に、第１剥離フィルム３２を積層する。
　充填材２０を構成する材料が粘着剤である場合、偏光板の穴部への粘着剤の注入と、第１粘着剤層３１を形成するための粘着剤の塗工とは、同時に行ってもよい。 The optical laminate 3 can also be obtained by the following procedure.
First, a second pressure-sensitive adhesive sheet provided with a second pressure-sensitive adhesive layer 41 on a second release film 42 is laminated on a polarizing plate 10 having a hollow hole portion 15. Next, the material of the filler 20 is injected so as to fill the hole 15 of the polarizing plate 10, and the first pressure-sensitive adhesive layer 31 is further formed on the surface side of the polarizing plate 10 opposite to the second pressure-sensitive adhesive sheet. Apply adhesive to make it. Then, the applied pressure-sensitive adhesive and the material of the filler 20 are simultaneously heated to be cured. By this curing, the first pressure-sensitive adhesive layer 31 is formed on the surface side of the polarizing plate 10 opposite to the second pressure-sensitive adhesive sheet, and the first pressure-sensitive adhesive layer 31 is formed on the surface side of the first pressure-sensitive adhesive layer 31 opposite to the polarizing plate 10. 1 The release film 32 is laminated.
When the material constituting the filler 20 is a pressure-sensitive adhesive, the injection of the pressure-sensitive adhesive into the holes of the polarizing plate and the coating of the pressure-sensitive adhesive for forming the first pressure-sensitive adhesive layer 31 may be performed at the same time. Good.
　第２粘着剤層４１の厚みは、特に限定されず、８０μｍ以上であってもよく、１００μｍ以上であってもよく、１２０μｍ以上であってもよい。第２粘着剤層４１の厚みは、通常２００μｍ以下であり、１８０μｍ以下であってもよく、１５０μｍ以下であってもよい。 The thickness of the second pressure-sensitive adhesive layer 41 is not particularly limited, and may be 80 μm or more, 100 μm or more, or 120 μm or more. The thickness of the second pressure-sensitive adhesive layer 41 is usually 200 μm or less, may be 180 μm or less, or may be 150 μm or less.
　第２剥離フィルム４２としては、例えば、第２粘着剤層４１と接する側に離型処理を施した樹脂フィルムを用いることができる。
　樹脂フィルム及び離型処理としては、例えば第１剥離フィルム３２で挙げたものを用いることができる。 As the second release film 42, for example, a resin film having a mold release treatment on the side in contact with the second pressure-sensitive adhesive layer 41 can be used.
As the resin film and the mold release treatment, for example, those mentioned in the first release film 32 can be used.
　第２剥離フィルム４２の厚みは特に限定されず、２０μｍ以上であってもよく、３０μｍ以上であってもよく、通常１００μｍ以下であり、８０μｍ以下であってもよく、６０μｍ以下であってもよい。 The thickness of the second release film 42 is not particularly limited, and may be 20 μm or more, 30 μm or more, usually 100 μm or less, 80 μm or less, or 60 μm or less. ..
　（光学積層体の他の例［３］）
　図５は、本発明の光学積層体の他の一例を模式的に示す概略断面図である。
　図５に示す光学積層体４は、図４に示す光学積層体３から第１剥離フィルム３２が剥離された積層体と積層構造が同じ光学積層体における第１粘着剤層３１上に、画像表示素子層３３を積層したものである。
　光学積層体４は、第２剥離フィルム４２を有していなくてもよい。 (Other Examples of Optical Laminates [3])
FIG. 5 is a schematic cross-sectional view schematically showing another example of the optical laminate of the present invention.
The optical laminate 4 shown in FIG. 5 is displayed as an image on the first pressure-sensitive adhesive layer 31 in the optical laminate having the same laminated structure as the laminate in which the first release film 32 is peeled from the optical laminate 3 shown in FIG. The element layers 33 are laminated.
The optical laminate 4 does not have to have the second release film 42.
　画像表示素子層３３としては、液晶表示装置に含まれる液晶パネル等の液晶表示素子や、有機ＥＬ表示装置に含まれる有機ＥＬ素子等の表示素子を含む層が挙げられる。 Examples of the image display element layer 33 include a liquid crystal display element such as a liquid crystal panel included in the liquid crystal display device and a layer including a display element such as an organic EL element included in the organic EL display device.
　光学積層体４は、例えば、光学積層体３（図４）から第１剥離フィルム３２を剥離し、更に、露出した第１粘着剤層３１と画像表示素子層３３とを貼合することによって得ることができる。 The optical laminate 4 is obtained, for example, by peeling the first release film 32 from the optical laminate 3 (FIG. 4), and further laminating the exposed first adhesive layer 31 and the image display element layer 33. be able to.
　光学積層体４は、次の手順で得ることもできる。
　まず、空洞の穴部１５を有する偏光板１０に、第１剥離フィルム３２上に第１粘着剤層３１を設けた第１粘着シートを積層した後、第１剥離フィルム３２を剥離する。第１剥離フィルム３２を剥離することにより露出した第１粘着剤層３１と画像表示素子層３３とを貼合した後、穴部１５を充填材２０で埋め、更に偏光板の第１粘着剤層３１とは反対側の面上に、第２剥離フィルム４２上に第２粘着剤層４１を設けた第２粘着シートを積層して、光学積層体４を得る。 The optical laminate 4 can also be obtained by the following procedure.
First, the first adhesive sheet provided with the first adhesive layer 31 is laminated on the first release film 32 on the polarizing plate 10 having the hollow hole portion 15, and then the first release film 32 is peeled off. After the first pressure-sensitive adhesive layer 31 exposed by peeling off the first release film 32 and the image display element layer 33 are bonded together, the hole portion 15 is filled with the filler 20, and further, the first pressure-sensitive adhesive layer of the polarizing plate is formed. A second pressure-sensitive adhesive sheet provided with the second pressure-sensitive adhesive layer 41 on the second release film 42 is laminated on the surface opposite to the 31 side to obtain an optical laminate 4.
　（光学積層体の他の例［４］）
　図６（ａ）及び（ｂ）は、本発明の光学積層体のさらに他の一例を模式的に示す概略断面図である。
　図６（ａ）及び（ｂ）に示す光学積層体５ａ，５ｂは、図４に示す光学積層体３において、偏光板１０と第１粘着剤層３１との間に第１機能層３４を含む。光学積層体５ａ，５ｂは、具体的には、図２に示す光学積層体１の第１保護層１２ａ側に第２粘着剤層４１及び第２剥離フィルム４２をこの順に有し、光学積層体１の第２保護層１２ｂ側に第１機能層３４、第１粘着剤層３１、及び第１剥離フィルム３２をこの順に有する。 (Other Examples of Optical Laminates [4])
6 (a) and 6 (b) are schematic cross-sectional views schematically showing still another example of the optical laminate of the present invention.
The optical laminates 5a and 5b shown in FIGS. 6A and 6B include a first functional layer 34 between the polarizing plate 10 and the first pressure-sensitive adhesive layer 31 in the optical laminate 3 shown in FIG. .. Specifically, the optical laminates 5a and 5b have a second adhesive layer 41 and a second release film 42 on the first protective layer 12a side of the optical laminate 1 shown in FIG. 2 in this order. The first functional layer 34, the first pressure-sensitive adhesive layer 31, and the first release film 32 are provided in this order on the second protective layer 12b side of 1.
　光学積層体５ａ，５ｂにおいて、偏光板１０が片面にのみ保護層を有する場合、第２粘着剤層４１が設けられる側に保護層（図３では、第１保護層１２ａ）を有することが好ましい。
　光学積層体５ａ，５ｂは、第１剥離フィルム３２を有していなくてもよい。
　光学積層体５ａ，５ｂは、第１剥離フィルム３２に代えて、第１粘着剤層３１上に画像表示素子層を有していてもよい。
　光学積層体５ａ，５ｂは、第２剥離フィルム４２を有していなくてもよい。 In the optical laminates 5a and 5b, when the polarizing plate 10 has a protective layer on only one side, it is preferable to have a protective layer (first protective layer 12a in FIG. 3) on the side where the second adhesive layer 41 is provided. ..
The optical laminates 5a and 5b do not have to have the first release film 32.
The optical laminates 5a and 5b may have an image display element layer on the first adhesive layer 31 instead of the first release film 32.
The optical laminates 5a and 5b do not have to have the second release film 42.
　光学積層体１と第１機能層３４との間には、貼合層が設けられていてもよい。貼合層は、粘着剤より形成された粘着剤層、又は、接着剤より形成された接着剤層である。貼合層を構成する粘着剤及び接着剤としては、上記したものが挙げられる。 A laminating layer may be provided between the optical laminate 1 and the first functional layer 34. The bonding layer is a pressure-sensitive adhesive layer formed of an adhesive or an adhesive layer formed of an adhesive. Examples of the pressure-sensitive adhesive and the adhesive constituting the bonding layer include those described above.
　第１機能層３４としては、光学フィルム及びタッチセンサパネルのうちの少なくとも一方が挙げられる。第１機能層３４が光学フィルム及びタッチセンサパネルの両方を含む場合、偏光板１０側から、光学フィルム及びタッチセンサパネルをこの順に有することが好ましい。光学積層体５ａ，５ｂは、第１機能層３４に加え、更にハードコート層を有していてもよい。また、光学積層体５ａ，５ｂが有する第１機能層３４は、光学フィルムを２層以上積層した構造を有していてもよい。 The first functional layer 34 includes at least one of an optical film and a touch sensor panel. When the first functional layer 34 includes both the optical film and the touch sensor panel, it is preferable to have the optical film and the touch sensor panel in this order from the polarizing plate 10 side. The optical laminates 5a and 5b may further have a hard coat layer in addition to the first functional layer 34. Further, the first functional layer 34 included in the optical laminates 5a and 5b may have a structure in which two or more optical films are laminated.
　第１機能層３４として光学フィルムを有する場合、光学フィルムは、偏光板１０の穴部１５が位置する領域に穴部を有していてもよい。この場合、図６（ｂ）に示すように、光学積層体５ｂにおいて、光学フィルム（第１機能層３４）の穴部にも充填材２０を設けることが好ましい。 When the optical film is provided as the first functional layer 34, the optical film may have holes in the region where the holes 15 of the polarizing plate 10 are located. In this case, as shown in FIG. 6B, it is preferable to provide the filler 20 also in the holes of the optical film (first functional layer 34) in the optical laminate 5b.
　図６（ａ）及び（ｂ）に示す光学積層体５ａ，５ｂでは、偏光板１０の穴部１５が充填材２０で充填されているので、高温環境下（例えば、温度８５℃、１００時間）で放置した場合等に、第２粘着剤層４１の剥がれや光漏れ等の不具合を抑制することができる。 In the optical laminates 5a and 5b shown in FIGS. 6A and 6B, since the hole 15 of the polarizing plate 10 is filled with the filler 20, it is placed in a high temperature environment (for example, at a temperature of 85 ° C. for 100 hours). It is possible to suppress problems such as peeling of the second adhesive layer 41 and light leakage when the second adhesive layer 41 is left unattended.
　図６（ａ）に示す光学積層体５ａは、次の手順で得ることができる。
　空洞の穴部１５を有する偏光板１０に第１機能層３４を設け、第１機能層３４上に、第１剥離フィルム３２上に第１粘着剤層３１を設けた第１粘着シートを積層する。その後、上記穴部１５を充填材２０で埋めることにより積層体（３）を得る。続いて、積層体（３）の偏光板１０上に、第２剥離フィルム４２上に第２粘着剤層４１を設けた第２粘着シートを積層することによって、光学積層体５ａを得る。 The optical laminate 5a shown in FIG. 6A can be obtained by the following procedure.
A first functional layer 34 is provided on a polarizing plate 10 having a hollow hole portion 15, and a first adhesive sheet provided with a first adhesive layer 31 on a first release film 32 is laminated on the first functional layer 34. .. Then, the laminated body (3) is obtained by filling the hole portion 15 with the filler 20. Subsequently, the optical laminate 5a is obtained by laminating a second adhesive sheet provided with the second adhesive layer 41 on the second release film 42 on the polarizing plate 10 of the laminate (3).
　上記した積層体（３）は、上記した光学積層体１（図２）に第１機能層３４を設け、得られた積層体（３）における第１機能層３４上に、上記の第１粘着シートを積層して得てもよい。 In the above-mentioned laminated body (3), the first functional layer 34 is provided on the above-mentioned optical laminated body 1 (FIG. 2), and the above-mentioned first adhesive is formed on the first functional layer 34 in the obtained laminated body (3). Sheets may be laminated and obtained.
　図６（ｂ）に示す光学積層体５ｂは、次の手順で得ることができる。
　まず、偏光層１１の片面又は両面に保護層１２が設けられた偏光板に第１機能層３４を設けて積層体（４）を得る。
　更に、積層体（４）全体を積層方向に貫通するように穴部を形成し、第１剥離フィルム３２上に第１粘着剤層３１を設けた第１粘着シートを積層して積層体（５）を得る。積層体（５）が有する穴部に充填材２０を設けた後、偏光板１０の第１粘着剤層３１とは反対側の面上に、上記の第２粘着シートを積層することにより、光学積層体５ｂを得る。
　上記の手順で光学積層体５ｂを製造する場合、第１機能層３４にも穴部が形成され、この穴部も充填材２０で充填される。
　第１粘着剤層３１にも穴部を設ける場合は、積層体（５）を次の手順で得てもよい。離型フィルム上に第１粘着剤層３１を設けた粘着シートを、積層体（４）の第１機能層３４上に積層した積層体を得る。
　続いて、この積層体全体を貫通するように穴部を形成し、更に、離型フィルムを剥離して第１剥離フィルム３２を積層することにより、積層体（５）を得ることができる。 The optical laminate 5b shown in FIG. 6B can be obtained by the following procedure.
First, the first functional layer 34 is provided on a polarizing plate having protective layers 12 on one or both sides of the polarizing layer 11 to obtain a laminated body (4).
Further, a hole is formed so as to penetrate the entire laminated body (4) in the laminating direction, and a first adhesive sheet provided with the first adhesive layer 31 is laminated on the first peeling film 32 to be laminated to the laminated body (5). ). After the filler 20 is provided in the hole portion of the laminated body (5), the above-mentioned second adhesive sheet is laminated on the surface of the polarizing plate 10 opposite to the first adhesive layer 31 to obtain optical light. A laminate 5b is obtained.
When the optical laminate 5b is manufactured by the above procedure, a hole is also formed in the first functional layer 34, and this hole is also filled with the filler 20.
When the first pressure-sensitive adhesive layer 31 is also provided with a hole, the laminated body (5) may be obtained by the following procedure. An adhesive sheet provided with the first pressure-sensitive adhesive layer 31 on the release film is laminated on the first functional layer 34 of the laminate (4) to obtain a laminate.
Subsequently, a laminated body (5) can be obtained by forming a hole portion so as to penetrate the entire laminated body, further peeling the release film, and laminating the first release film 32.
　第２粘着シートの積層は、真空条件下で行ってもよい。光学積層体５ａ，５ｂの充填材２０が、第２粘着剤層４１を構成する粘着剤と同じ粘着剤である場合は、加熱条件下（例えば、温度５０℃～７０℃の条件下）で行うことが好ましい。 The second adhesive sheet may be laminated under vacuum conditions. When the filler 20 of the optical laminates 5a and 5b is the same adhesive as the adhesive constituting the second adhesive layer 41, it is carried out under heating conditions (for example, under conditions of a temperature of 50 ° C to 70 ° C). Is preferable.
　上記のように、第２粘着シートの積層を、偏光板１０の穴部１５が充填材２０で充填された状態で行うことにより、穴部１５に異物が混入したり、穴部１５の周辺に気泡が混入することを抑制することができる。 As described above, by laminating the second adhesive sheet in a state where the hole 15 of the polarizing plate 10 is filled with the filler 20, foreign matter is mixed in the hole 15 or around the hole 15. It is possible to suppress the mixing of air bubbles.
　光学フィルムとしては、位相差フィルム（樹脂フィルム又はや重合性液晶化合物を配向させて重合した硬化膜）、反射フィルム、半透過型反射フィルム、輝度向上フィルム、光学補償フィルム、防眩機能付きフィルム等が挙げられる。光学フィルムは、１層であってもよく２層以上であってもよく、２層以上の場合、互いに同じ光学フィルムであってもよく、互いに異なる光学フィルムであってもよい。
　光学フィルムは、λ／４波長板であってもよく、λ／４波長板とλ／２波長板との積層フィルム、逆波長分散性のλ／４波長板とポジティブＣプレートとの積層フィルムであってもよい。光学フィルムが積層フィルムである場合、フィルム間には貼合層（接着剤層又は粘着剤層）が介在してもよい。 Examples of the optical film include a retardation film (resin film or a cured film obtained by orienting and polymerizing a polymerizable liquid crystal compound), a reflective film, a transflective reflective film, a brightness improving film, an optical compensation film, a film with an antiglare function, and the like. Can be mentioned. The optical film may be one layer, two or more layers, and in the case of two or more layers, they may be the same optical film or different optical films.
The optical film may be a λ / 4 wave plate, a laminated film of a λ / 4 wave plate and a λ / 2 wave plate, or a laminated film of a reverse wavelength dispersive λ / 4 wave plate and a positive C plate. There may be. When the optical film is a laminated film, a bonding layer (adhesive layer or adhesive layer) may be interposed between the films.
　タッチセンサパネルは、指やタッチペン等によってタッチされた位置を検出可能なセンサである。タッチセンサパネルの検出方式は特に限定されず、抵抗膜方式、静電容量結合方式、光センサ方式、超音波方式、電磁誘導結合方式、表面弾性波方式等のタッチセンサパネルが例示される。低コストであることから、抵抗膜方式、静電容量結合方式のタッチセンサパネルが好適に用いられる。 The touch sensor panel is a sensor that can detect the position touched by a finger, touch pen, or the like. The detection method of the touch sensor panel is not particularly limited, and examples thereof include a touch sensor panel such as a resistive film method, a capacitance coupling method, an optical sensor method, an ultrasonic method, an electromagnetic induction coupling method, and a surface acoustic wave method. Since the cost is low, a touch sensor panel of a resistance film type or a capacitance coupling type is preferably used.
　ハードコート層としては、トリアセチルセルロース、アクリル系樹脂等の樹脂からなる層が挙げられる。 Examples of the hard coat layer include a layer made of a resin such as triacetyl cellulose or an acrylic resin.
　（光学積層体の他の例［５］）
　図７は、本発明の光学積層体のさらに他の一例を模式的に示す概略断面図である。
　図７に示す光学積層体６は、図４に示す光学積層体３から第２剥離フィルム４２を剥離して得られた光学積層体の第２粘着剤層４１上に、第２機能層４４を積層したものである。 (Other Examples of Optical Laminates [5])
FIG. 7 is a schematic cross-sectional view schematically showing still another example of the optical laminate of the present invention.
In the optical laminate 6 shown in FIG. 7, a second functional layer 44 is formed on the second adhesive layer 41 of the optical laminate obtained by peeling the second release film 42 from the optical laminate 3 shown in FIG. It is a laminated product.
　光学積層体６は、第１剥離フィルム３２を有していなくてもよい。
　光学積層体６は、第１剥離フィルム３２に代えて、第１粘着剤層３１上に画像表示素子層を有していてもよい。 The optical laminate 6 does not have to have the first release film 32.
The optical laminate 6 may have an image display element layer on the first pressure-sensitive adhesive layer 31 instead of the first release film 32.
　第２機能層４４としては、カバー部材及びタッチセンサパネルのうちの少なくとも一方が挙げられる。第２機能層４４がカバー部材及びタッチセンサパネルの両方を含む場合、第２粘着剤層４１側から、タッチセンサパネル及びカバー部材をこの順に有することが好ましい。 The second functional layer 44 includes at least one of a cover member and a touch sensor panel. When the second functional layer 44 includes both the cover member and the touch sensor panel, it is preferable to have the touch sensor panel and the cover member in this order from the second adhesive layer 41 side.
　光学積層体６は、図４に示す光学積層体３の第２剥離フィルム４２を剥離して露出した第２粘着剤層４１上に、第２機能層４４を積層することによって得ることができる。 The optical laminate 6 can be obtained by laminating the second functional layer 44 on the second adhesive layer 41 exposed by peeling the second release film 42 of the optical laminate 3 shown in FIG.
　カバー部材は、表示装置等の最表面をなす部材として用いることができる。カバー部材は、透光性の（好ましくは光学的に透明な）板状体である。カバー部材は、単層構造であってもよいし、多層構造であってもよい。 The cover member can be used as a member forming the outermost surface of a display device or the like. The cover member is a translucent (preferably optically transparent) plate-like body. The cover member may have a single-layer structure or a multi-layer structure.
　カバー部材は、ガラス又は強化ガラス等の無機材料、ヤング率が２ＧＰａ以上の樹脂フィルムから構成されることが好ましい。ガラス及び強化ガラス等の無機材料、特に、フレキシブルディスプレイ用途としては、屈曲可能とするために、樹脂フィルムが好適であり、中でもポリアミドフィルム、ポリアミドイミドフィルム、ポリイミドフィルム、ポリエステル系フィルム、オレフィン系フィルム、アクリル系フィルム、セルロース系フィルムが好ましい。高分子フィルムの中には、シリカ等の無機粒子、有機微粒子、ゴム粒子等を分散させることも好ましい。
　樹脂フィルムからなる屈曲可能なカバー部材は、少なくとも片面にハードコート層を有していてもよい。ハードコート層は公知の方法で樹脂フィルムの表面に設けることができる。 The cover member is preferably composed of an inorganic material such as glass or tempered glass, and a resin film having a Young's modulus of 2 GPa or more. Inorganic materials such as glass and tempered glass, especially for flexible display applications, resin films are suitable in order to make them flexible, among which polyamide films, polyamideimide films, polyimide films, polyester films, olefin films, etc. Acrylic film and cellulose film are preferable. It is also preferable to disperse inorganic particles such as silica, organic fine particles, rubber particles and the like in the polymer film.
The bendable cover member made of a resin film may have a hard coat layer on at least one side. The hard coat layer can be provided on the surface of the resin film by a known method.
　タッチセンセンサパネルとしては、上記したものが挙げられる。 Examples of the touch sensor panel include those described above.
　（光学積層体の用途）
　光学積層体１～４，５ａ，５ｂ，６は、液晶表示装置や有機ＥＬ表示装置等の表示装置に用いることができる。表示装置としては、スマートフォン、タブレット等のモバイル機器、テレビ、デジタルフォトフレーム、電子看板、測定器や計器類、事務用機器、医療機器、電算機器等が挙げられる。
　光学積層体５ａ，５ｂ，６において、積層部材がタッチセンサパネルである場合、スマートフォンやタブレット等のタッチパネル式表示装置に用いることができる。 (Use of optical laminate)
The optical laminates 1 to 4, 5a, 5b, 6 can be used in a display device such as a liquid crystal display device or an organic EL display device. Examples of display devices include mobile devices such as smartphones and tablets, televisions, digital photo frames, electronic signboards, measuring instruments and instruments, office equipment, medical equipment, computer equipment and the like.
In the optical laminates 5a, 5b, and 6, when the laminate member is a touch sensor panel, it can be used for a touch panel type display device such as a smartphone or a tablet.
　１～４，５ａ，５ｂ，６　光学積層体、１０　偏光板、１１　偏光層、１２　保護層、１２ａ　第１保護層、１２ｂ　第２保護層、２０　充填材、３１　第１粘着剤層、３２　第１剥離フィルム、３３　画像表示素子層、３４　第１機能層、４１　第２粘着剤層、４２　第２剥離フィルム、４４　第２機能層 1 to 4, 5a, 5b, 6 optical laminate, 10 polarizing plate, 11 polarizing layer, 12 protective layer, 12a first protective layer, 12b second protective layer, 20 filler, 31 first adhesive layer, 32nd 1 release film, 33 image display element layer, 34 first functional layer, 41 second adhesive layer, 42 second release film, 44 second functional layer

Claims (15)

  1. 　偏光層と、前記偏光層の片面又は両面に設けられる保護層とが積層されており、前記偏光層と前記保護層とを積層方向に貫通する穴部を有する偏光板を含み、
    　前記穴部は、透光性の充填材により充填されている、光学積層体。     The polarizing layer and the protective layer provided on one side or both sides of the polarizing layer are laminated, and include a polarizing plate having a hole portion penetrating the polarizing layer and the protective layer in the stacking direction.
    The hole is an optical laminate filled with a translucent filler.
  2. 　前記充填材は、前記穴部全体に設けられている、請求項１に記載の光学積層体。 The optical laminate according to claim 1, wherein the filler is provided in the entire hole portion.
  3. 　前記充填材は、樹脂を含む、請求項１又は２に記載の光学積層体。 The optical laminate according to claim 1 or 2, wherein the filler contains a resin.
  4. 　前記偏光板の厚みは、１５μｍ以上である、請求項１～３のいずれか１項に記載の光学積層体。 The optical laminate according to any one of claims 1 to 3, wherein the thickness of the polarizing plate is 15 μm or more.
  5. 　前記穴部の径は、０．５ｍｍ以上２０ｍｍ以下である、請求項１～４のいずれか１項に記載の光学積層体。 The optical laminate according to any one of claims 1 to 4, wherein the diameter of the hole is 0.5 mm or more and 20 mm or less.
  6. 　さらに、前記偏光板の一方の面側に第１粘着剤層を有する、請求項１～５のいずれか１項に記載の光学積層体。 The optical laminate according to any one of claims 1 to 5, further comprising a first pressure-sensitive adhesive layer on one surface side of the polarizing plate.
  7. 　さらに、前記第１粘着剤層の前記偏光板とは反対側の面側に、第１剥離フィルムを有する、請求項６に記載の光学積層体。 The optical laminate according to claim 6, further comprising a first release film on the surface side of the first pressure-sensitive adhesive layer opposite to the polarizing plate.
  8. 　さらに、前記第１粘着剤層の前記偏光板とは反対側の面側に、画像表示素子層を有する、請求項６に記載の光学積層体。 The optical laminate according to claim 6, further comprising an image display element layer on the surface side of the first pressure-sensitive adhesive layer opposite to the polarizing plate.
  9. 　さらに、前記偏光板と前記第１粘着剤層との間に、第１機能層を含む、請求項６～８のいずれか１項に記載の光学積層体。 The optical laminate according to any one of claims 6 to 8, further comprising a first functional layer between the polarizing plate and the first pressure-sensitive adhesive layer.
  10. 　前記第１機能層は、光学フィルム及びタッチセンサパネルのうちの少なくとも一方を含む、請求項９に記載の光学積層体。 The optical laminate according to claim 9, wherein the first functional layer includes at least one of an optical film and a touch sensor panel.
  11. 　さらに、前記偏光板の他方の面上に第２粘着剤層を有する、請求項６～１０のいずれか１項に記載の光学積層体。 The optical laminate according to any one of claims 6 to 10, further having a second pressure-sensitive adhesive layer on the other surface of the polarizing plate.
  12. 　前記充填材は、前記第２粘着剤層を構成する粘着剤と同じ粘着剤である、請求項１１に記載の光学積層体。 The optical laminate according to claim 11, wherein the filler is the same adhesive as the adhesive constituting the second adhesive layer.
  13. 　さらに、前記第２粘着剤層の前記偏光板とは反対側の面側に、第２剥離フィルムを有する、請求項１１又は１２に記載の光学積層体。 The optical laminate according to claim 11 or 12, further comprising a second release film on the surface side of the second pressure-sensitive adhesive layer opposite to the polarizing plate.
  14. 　さらに、前記第２粘着剤層の前記偏光板とは反対側の面側に、第２機能層を有する、請求項１１又は１２に記載の光学積層体。 The optical laminate according to claim 11 or 12, further comprising a second functional layer on the surface side of the second pressure-sensitive adhesive layer opposite to the polarizing plate.
  15. 　前記第２機能層は、タッチセンサパネル及びカバー部材のうちの少なくとも一方を含む、請求項１４に記載の光学積層体。 The optical laminate according to claim 14, wherein the second functional layer includes at least one of a touch sensor panel and a cover member.
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