WO2020262143A1 - 光学積層体 - Google Patents

光学積層体 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
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WO
WIPO (PCT)
Prior art keywords
layer
optical laminate
pressure
polarizing plate
sensitive adhesive
Prior art date
Application number
PCT/JP2020/023758
Other languages
English (en)
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/zh
Publication of WO2020262143A1 publication Critical patent/WO2020262143A1/ja

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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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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Optics & Photonics (AREA)
  • Theoretical Computer Science (AREA)
  • Nonlinear Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mathematical Physics (AREA)
  • General Engineering & Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Polarising Elements (AREA)
  • Laminated Bodies (AREA)
  • Liquid Crystal (AREA)
PCT/JP2020/023758 2019-06-28 2020-06-17 光学積層体 WO2020262143A1 (ja)

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