WO2022030194A1 - 光学積層体および該光学積層体の光学フィルムを含む画像表示装置 - Google Patents

光学積層体および該光学積層体の光学フィルムを含む画像表示装置 Download PDF

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Publication number
WO2022030194A1
WO2022030194A1 PCT/JP2021/026219 JP2021026219W WO2022030194A1 WO 2022030194 A1 WO2022030194 A1 WO 2022030194A1 JP 2021026219 W JP2021026219 W JP 2021026219W WO 2022030194 A1 WO2022030194 A1 WO 2022030194A1
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Prior art keywords
surface protective
protective film
optical
film
optical laminate
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PCT/JP2021/026219
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English (en)
French (fr)
Japanese (ja)
Inventor
圭太 小川
智之 木村
勝則 高田
雄祐 外山
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Nitto Denko Corp
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Nitto Denko Corp
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Priority to CN202180057479.0A priority Critical patent/CN116171395B/zh
Priority to KR1020237001949A priority patent/KR20230042457A/ko
Priority to JP2022541178A priority patent/JPWO2022030194A1/ja
Publication of WO2022030194A1 publication Critical patent/WO2022030194A1/ja
Anticipated expiration legal-status Critical
Priority to JP2025199294A priority patent/JP2026031580A/ja
Ceased legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
    • C09J7/38—Pressure-sensitive adhesives [PSA]
    • 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
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00—Electroluminescent light sources
    • H05B33/02—Details
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00—Electroluminescent light sources
    • H05B33/12—Light sources with substantially two-dimensional [2D] radiating surfaces
    • H05B33/14—Light sources with substantially two-dimensional [2D] radiating surfaces characterised by the chemical or physical composition or the arrangement of the electroluminescent material, or by the simultaneous addition of the electroluminescent material in or onto the light source
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80—Constructional details
    • H10K59/8791—Arrangements for improving contrast, e.g. preventing reflection of ambient light

Definitions

  • the present invention relates to an optical laminate and an image display device including an optical film of the optical laminate.
  • optical laminates for example, polarizing plates
  • image display devices such as mobile phones and notebook personal computers in order to realize image display and / or enhance the performance of the image display.
  • the optical laminate is provided with an adhesive layer as the outermost layer, and the optical laminate can be bonded to an image display cell.
  • a separator is temporarily attached to the pressure-sensitive adhesive layer so that it can be peeled off to protect the pressure-sensitive adhesive layer until actual use.
  • a surface protective film is temporarily attached to the side opposite to the pressure-sensitive adhesive layer of the optical laminate so that the optical laminate can be peeled off to protect the optical laminate in the manufacturing process, transportation, and the like.
  • a main object of the present invention is to provide an optical laminate in which peeling defects when peeling a surface protective film from a deformed portion are remarkably suppressed.
  • the optical laminate according to the embodiment of the present invention includes an optical film, a surface protective film temporarily attached to one side of the optical film so as to be peelable, and an adhesive layer arranged on the other side of the optical film. And a separator temporarily attached to the pressure-sensitive adhesive layer so as to be peelable.
  • the optical laminate has a variant shape other than a rectangle.
  • the upper end of the surface protective film extends outward from the lower end, and is located at a position 1 mm away from the peeling start point when the surface protective film is peeled from the variant, in a direction orthogonal to the peeling direction.
  • the length of the straight line connecting the outer edges of the optical laminate is 2 mm or more, and the bending load of the surface protective film is 2.5 g or less.
  • the variant comprises an R-shaped chamfer at the corner.
  • the trigger peeling force when peeling the surface protective film is 2.0 N or less.
  • the thickness of the surface protective film is 100 ⁇ m or less.
  • the extending length of the upper end of the surface protective film is 1 ⁇ m to 70 ⁇ m.
  • the optical film comprises a polarizing element.
  • an image display device is provided. This image display device includes the optical film of the optical laminate.
  • the upper end of the surface protective film extends outward from the lower end, and
  • the length of the straight line connecting the outer edges of the optical laminate is 2 mm or more in the direction orthogonal to the peeling direction at a position 1 mm away from the peeling start point when the surface protective film is peeled from the deformed portion.
  • FIG. 1 Schematic FIG. 1 is a schematic cross-sectional view of an optical laminate according to one embodiment of the present invention.
  • the optical laminate 100 of the illustrated example includes an optical film 10, a surface protective film 20 temporarily attached to one side of the optical film 10 so as to be peelable, and an adhesive layer arranged on the other side of the optical film 10. It has 30 and a separator 40 that is temporarily attached to the pressure-sensitive adhesive layer 30 so as to be peelable.
  • the separator 40 is typically arranged on the image display cell side.
  • the separator 40 is peeled off and removed, and the pressure-sensitive adhesive layer 30 displays the optical laminate (substantially, the optical film) as an image display device (substantially). Can be used to paste into an image display cell).
  • the surface protective film 20 typically has a base material 21 and an adhesive layer 22. In order to distinguish it from the pressure-sensitive adhesive layer 30, the pressure-sensitive adhesive layer 22 of the surface protective film may be referred to as a "PF pressure-sensitive adhesive layer".
  • the surface protective film 20 is also peeled off during actual use of the optical laminate.
  • the optical laminate has a variant shape other than a rectangle.
  • the term "having a variant other than a rectangle” means that the planar view shape of the optical laminate has a shape other than a rectangle.
  • the irregular shape is typically a deformed portion that has been deformed. Therefore, the "optical laminate having a deformed shape other than a rectangle" (hereinafter, may be referred to as a "deformed optical laminate”) is the entire deformed optical laminate (that is, the outer edge that defines the plan view shape of the optical laminate). Includes not only the case where is non-rectangular, but also the case where the deformed portion is formed in a portion inwardly separated from the outer edge of the rectangular optical laminate.
  • the deformed portion includes a chamfered corner portion having an R shape, a through hole, and a cut portion that becomes a concave portion when viewed in a plan view, as shown in FIG.
  • Typical examples of the recess include a shape similar to a ship shape (not shown), a rectangle, an R shape similar to a bathtub shape, a V-shaped notch, and a U-shaped notch.
  • the irregular shape as shown in FIGS.
  • the shape of the deformed shape is not limited to the illustrated example.
  • any appropriate shape for example, ellipse, triangle, quadrangle, pentagon, hexagon, octagon
  • the through hole is provided at an arbitrary appropriate position according to the purpose. As shown in FIG.
  • the through hole may be provided at a substantially central portion of the longitudinal end portion of the rectangular optical laminate, or may be provided at a predetermined position at the longitudinal end portion, and the optical laminate may be provided. It may be provided at a corner of the body; although not shown, it may be provided at the lateral end of a rectangular optical laminate; as shown in FIG. 3 or 4, a deformed optical laminate. It may be provided in the central part of the. A plurality of through holes may be provided. Further, the shapes of the illustrated examples may be appropriately combined according to the purpose. For example, a V-shaped notch and / or a U-shaped notch may be formed at any suitable position on the outer edge of the modified optical laminate of FIG. 3 or FIG. Such a deformed optical laminate can be suitably used for an image display device such as an automobile meter panel, a smartphone, a tablet PC or a smart watch.
  • an image display device such as an automobile meter panel, a smartphone, a tablet PC or a smart watch.
  • the variant when its radius of curvature includes an R shape, its radius of curvature is, for example, 0.2 mm or more, for example 1 mm or more, for example 2 mm or more, for example 3 mm or more, and for example 5 mm or more, and also. For example, it is 10 mm or more.
  • the radius of curvature is, for example, 30 mm or less, for example 25 mm or less, for example 20 mm or less, for example 15 mm or less, and for example 10 mm or less.
  • the radius of curvature of the corner is, for example, 3 ⁇ m to 30 ⁇ m, for example, 5 ⁇ m to 25 ⁇ m, and for example, 10 ⁇ m to 25 ⁇ m.
  • the radius of curvature of the corner may be, for example, 5 ⁇ m to 15 ⁇ m.
  • the effect of the embodiment of the present invention can be remarkable in an optical laminated body having such a deformed portion having a radius of curvature.
  • a plurality of R shapes may be included. Further, one R shape may be a combination of a plurality of curvatures.
  • the cross-sectional shape of the surface protective film may be a trapezoidal shape in which the upper base is longer than the lower base.
  • the present inventors may form such an extended portion on the surface protective film due to the deformed processing, and the extended portion may affect the peeling property when the surface protective film is peeled from the deformed processed portion. I found that. Furthermore, as a result of diligent studies on the relationship between the configuration of the optical laminate, the extended portion, and the peeling characteristics of the surface protective film, the present inventors set the bending load of the surface protective film, which will be described later, to a predetermined value or less.
  • the present invention has been completed by finding that the peeling defect when peeling the surface protective film from the deformed portion can be remarkably suppressed.
  • the upper end of the surface protective film 20 substantially extends outward from the lower end of the PF pressure-sensitive adhesive layer 22, as shown in FIG.
  • the "extended length L of the surface protective film” means a length starting from the lower end of the PF pressure-sensitive adhesive layer 22 as shown in FIG.
  • the extension length L is, for example, 1 ⁇ m to 70 ⁇ m, for example, 5 ⁇ m to 70 ⁇ m, for example, 6 ⁇ m to 55 ⁇ m, and for example, 7 ⁇ m to 45 ⁇ m.
  • Deformation processing can be performed in any suitable manner. Specific examples include laser light irradiation, cutting with an end mill, and punching with a Thomson blade or Pinnacle (registered trademark) blade.
  • the extending portion as shown in FIG. 1 is formed, for example, by irradiating a laser beam from the separator side of the optical laminate, or by cutting with an end mill with the surface protective film of the optical laminate facing up. obtain.
  • the optical laminate is formed at a position 1 mm away from the peeling start point when the surface protective film is peeled from the deformed portion and is orthogonal to the peeling direction.
  • the length of the straight line AB connecting the outer edges of the above is 2 mm or more.
  • the length of the straight line AB is, for example, 3 mm or more, for example, 4 mm or more, for example, 5 mm or more, and for example, 6 mm or more.
  • the length of the straight line AB is, for example, 100 mm or less, for example, 50 mm or less, for example, 30 mm or less, for example, 20 mm or less, for example, 18 mm or less, and for example, 15 mm or less.
  • the length of the straight line AB may be, for example, 5.5 ⁇ m to 9.5 ⁇ m, or may be, for example, 5.8 ⁇ m to 9.0 ⁇ m.
  • the fact that the length of the straight line AB is equal to or greater than a predetermined value means that it is difficult to secure a trigger for peeling the surface protective film from the deformed portion. For example, in the deformed optical laminate as shown in FIGS.
  • the surface protective film when the surface protective film is peeled off, the force required for the peeling, that is, the stress is dispersed, so that the peeling becomes very difficult. According to the embodiment of the present invention, even with such a configuration, the surface protective film can be easily peeled off from the deformed processed portion without causing peeling failure.
  • the bending load of the surface protective film is 2.5 g or less. If the bending load of the surface protective film is 2.5 g or less, even if the deformed portion has a shape that is difficult to peel off, peeling failure when peeling the surface protective film from the deformed portion is remarkably suppressed. be able to.
  • the surface protective film has a base material and an adhesive layer as described above, and even if the base material thickness, the pressure-sensitive adhesive layer thickness, the total thickness, the elastic modulus of the base material, the elastic modulus of the pressure-sensitive adhesive layer, etc. are individually adjusted. , It is not possible to comprehensively suppress peeling defects.
  • the present inventors have found that by setting the bending load of the surface protective film to 2.5 g or less, it is possible to comprehensively suppress peeling defects when the surface protective film is peeled from the deformed portion.
  • the bending load can be measured as follows. As shown in FIG. 6, a jig having a U-shaped cross section is prepared and installed so as to cover the weighing table at a position 30 mm away from the weighing table.
  • the bending load of the surface protective film is, for example, 2.0 g or less, for example 1.5 g or less, and for example 1 g or less, and for example 0.8 g or less, and for example.
  • 0.5 g or less for example 0.3 g or less, for example 0.1 g or less, for example 0.05 g or less, and for example 0.03 g or less.
  • the lower limit of the bending load can be, for example, 0.005 g.
  • the bending load of the surface protective film can be, for example, 0.5 g to 2.0 g. When the bending load of the surface protective film is within such a range, dents can be satisfactorily suppressed while appropriately suppressing peeling defects.
  • the trigger peeling force when peeling the surface protective film is, for example, 2.0 N or less, for example, 1.5 N or less, for example, 1.2 N or less, and for example, 1. It is 0.0 N or less, for example 0.8 N or less, for example 0.7 N or less, for example 0.6 N or less, and for example 0.5 N or less.
  • the lower limit of the trigger peeling force can be, for example, 0.05 N.
  • the trigger peeling force can be measured according to, for example, JIS Z0237.
  • the peeling force when a pickup tape is attached to the surface of the surface protective film of the test sample (optical laminate) along the peeling direction and peeled at 90 ° in the tensile direction using the pickup tape is a trigger. It can be measured as a peeling force.
  • the width of the pickup tape can be, for example, 10 mm and the tensile speed can be, for example, 300 mm / min.
  • the optical film 10 may be a film composed of a single layer or a laminated body.
  • the optical film composed of a single layer include a window film, a splitter, and a retardation film.
  • Specific examples of the optical film configured as a laminated body include a polarizing plate (typically, a laminated body of a polarizing element and a protective film), a conductive film for a touch panel, a surface-treated film, and a single layer thereof.
  • Examples thereof include a laminated body (for example, an antireflection circular polarizing plate and a polarizing plate with a conductive layer for a touch panel) in which an optical film configured as a constituent optical film and / or an optical film configured as a laminated body is appropriately laminated according to a purpose.
  • a laminated body for example, an antireflection circular polarizing plate and a polarizing plate with a conductive layer for a touch panel
  • an optical film configured as a constituent optical film and / or an optical film configured as a laminated body is appropriately laminated according to a purpose.
  • the surface protective film 20 typically has a base material 21 and a PF pressure-sensitive adhesive layer 22.
  • the base material 21 may be made of any suitable material as long as the desired bending load can be achieved.
  • Specific examples of the constituent materials include polyester polymers such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), and polybutylene terephthalate (PBT); cellulose polymers such as diacetyl cellulose and triacetyl cellulose; polycarbonate polymers; poly. Examples thereof include (meth) acrylic polymers such as methyl methacrylate; and cycloolefin polymers such as polynorbornene; These may be used alone or in combination of two or more.
  • polyester-based polymer and among them, those having excellent properties such as optical properties (for example, transparency), mechanical strength, thermal stability, moisture shielding property, isotropic property, flexibility, and dimensional stability. It is preferable to use.
  • a polyester film that is not too stiff can easily realize the desired bending load.
  • the characteristics of the polyester film can be controlled by adjusting the types and combinations of the polycarboxylic acid component and the polyol component.
  • polyethylene terephthalate and polybutylene terephthalate may be used in combination as a constituent material of the base material.
  • a styrene polymer such as polystyrene or an acrylonitrile-styrene copolymer; a vinyl chloride polymer; an amide polymer such as nylon 6, nylon 6, 6 or an aromatic polyamide; an imide polymer.
  • the base material may have a laminated structure of a resin layer / an adhesive layer / a resin layer.
  • the constituent material of the resin layer include those described above as the constituent material of the base material.
  • the constituent material of the adhesive layer include an adhesive, an adhesive, and an anchor coating agent.
  • the adhesive layer may have an adhesive layer or a laminated structure of the adhesive layer and the anchor coat layer.
  • the tensile elastic modulus of the base material 21 is, for example, 2.3 ⁇ 10 9 Pa or less, preferably 1.5 ⁇ 10 9 Pa or less, more preferably 1.3 ⁇ 10 9 Pa or less, still more preferable. Is 1.0 ⁇ 10 7 Pa to 1.3 ⁇ 10 9 Pa, and particularly preferably 1.0 ⁇ 10 8 Pa to 1.3 ⁇ 10 9 Pa.
  • the tensile modulus is measured in accordance with JIS K 7161.
  • the thickness of the substrate is, for example, 20 ⁇ m to 100 ⁇ m, for example 25 ⁇ m to 80 ⁇ m, and for example 30 ⁇ m to 50 ⁇ m.
  • the thickness of the substrate can be, for example, 60 ⁇ m to 90 ⁇ m.
  • dents can be satisfactorily suppressed while appropriately suppressing peeling defects.
  • any appropriate configuration can be adopted as long as the desired bending load can be realized.
  • Specific examples include acrylic adhesives, rubber adhesives, silicone adhesives, polyester adhesives, urethane adhesives, epoxy adhesives, and polyether adhesives.
  • the base resin of the pressure-sensitive adhesive may be used alone or in combination of two or more.
  • the base resin is preferably an acrylic resin (that is, the PF pressure-sensitive adhesive layer is preferably composed of an acrylic pressure-sensitive adhesive).
  • the pressure-sensitive adhesive constituting the PF pressure-sensitive adhesive layer is characterized in that the base resin contains a polymer having an active hydrogen-containing functional group (for example, a hydroxyl group). With such a base resin, a PF pressure-sensitive adhesive layer having a desired storage elastic modulus can be obtained. Details of the pressure-sensitive adhesive constituting the PF pressure-sensitive adhesive layer are described in, for example, Japanese Patent Application Laid-Open No. 2018-123281, and the description of the publication is incorporated herein by reference.
  • the thickness of the PF pressure-sensitive adhesive layer 22 is, for example, 5 ⁇ m to 50 ⁇ m, for example, 10 ⁇ m to 40 ⁇ m, and for example, 10 ⁇ m to 30 ⁇ m. When the thickness of the PF pressure-sensitive adhesive layer is within such a range, it may be easy to realize the desired bending load.
  • the storage elastic modulus G'of the PF pressure-sensitive adhesive layer 22 at 25 ° C. can be, for example, 0.5 ⁇ 10 6 (Pa) to 3.0 ⁇ 10 6 (Pa). If the storage elastic modulus is in such a range, it may be easy to realize the desired bending load. Further, it is possible to obtain an adhesive layer (as a result, a surface protective film) having an excellent balance between adhesiveness and peelability.
  • the storage elastic modulus can be obtained from, for example, dynamic viscoelasticity measurement.
  • the thickness of the surface protective film 20 is, for example, 100 ⁇ m or less, for example, 30 ⁇ m to 90 ⁇ m, for example, 40 ⁇ m to 80 ⁇ m, and for example, 45 ⁇ m to 70 ⁇ m. When the thickness of the surface protective film is within such a range, it may be easy to realize the desired bending load. In addition, poor peeling when peeling the surface protective film can be prevented extremely well.
  • the thickness of the surface protective film may be, for example, 70 ⁇ m to 100 ⁇ m. When the thickness of the surface protective film is within such a range, dents can be satisfactorily suppressed while appropriately suppressing peeling defects.
  • the thickness of the surface protective film means the total thickness of the base material and the PF pressure-sensitive adhesive layer.
  • Adhesive Layer As the adhesive layer 30, any suitable configuration can be adopted. Specific examples of the adhesives constituting the adhesive layer include acrylic adhesives, rubber adhesives, silicone adhesives, polyester adhesives, urethane adhesives, epoxy adhesives, and polyether adhesives. Can be mentioned. By adjusting the type, number, combination and blending ratio of the monomers forming the base resin of the pressure-sensitive adhesive, the blending amount of the cross-linking agent, the reaction temperature, the reaction time, etc., the pressure-sensitive adhesive having desired characteristics according to the purpose. Can be prepared. The base resin of the pressure-sensitive adhesive may be used alone or in combination of two or more. Acrylic adhesives are preferred from the viewpoint of transparency, processability, durability and the like.
  • the thickness of the pressure-sensitive adhesive layer 30 can be, for example, 10 ⁇ m to 100 ⁇ m.
  • the storage elastic modulus G'of the pressure-sensitive adhesive layer 30 at 25 ° C. can be, for example, 1.0 ⁇ 10 4 (Pa) to 1.0 ⁇ 10 6 (Pa).
  • any suitable separator may be adopted.
  • Specific examples include plastic films, non-woven fabrics or paper surface-coated with a release agent.
  • Specific examples of the release agent include a silicone-based release agent, a fluorine-based release agent, and a long-chain alkyl acrylate-based release agent.
  • Specific examples of the plastic film include polyethylene terephthalate (PET) film, polyethylene film, and polypropylene film.
  • PET polyethylene terephthalate
  • the thickness of the separator can be, for example, 10 ⁇ m to 100 ⁇ m.
  • the optical laminate (substantially an optical film) according to the embodiment of the present invention can be suitably applied to an image display device. Therefore, an image display device including an optical laminate (substantially an optical film) is also included in the embodiment of the present invention.
  • the image display device typically includes an image display cell and an optical film bonded to the image display cell via an adhesive layer. Examples of the image display device include a liquid crystal display device, an organic electroluminescence (EL) display device, and a quantum dot display device.
  • Adhesive Composition PSA1 > 5 parts of an isocyanate-based cross-linking agent (manufactured by Tosoh Corporation, trade name “Coronate HX", isocyanurate of hexamethylene diisocyanate) and reaction with 100 parts of the solid content of the solution of the acrylic polymer A1 obtained in Production Example 1.
  • a solution of the acrylic pressure-sensitive adhesive composition PSA1 was prepared by blending 0.3 part of a sex surfactant (manufactured by Daiichi Kogyo Seiyaku Co., Ltd., trade name "Aqualon HS-10").
  • a surface protective film SPV6 was produced in the same manner as in Production Example 6 except that a pressure-sensitive adhesive layer having a thickness of 15 ⁇ m was formed by using the pressure-sensitive adhesive composition PSA2 instead of the pressure-sensitive adhesive composition PSA1.
  • the bending load of SPV6 was 0.027 g.
  • ⁇ Manufacturing Example 12 Fabrication of Surface Protective Film SPV7>
  • the surface protective film is the same as in Production Example 6 except that the thickness of the PET film is 125 ⁇ m and the pressure-sensitive adhesive layer having a thickness of 20 ⁇ m is formed by using the pressure-sensitive adhesive composition PSA3 instead of the pressure-sensitive adhesive composition PSA1.
  • SPV7 was produced.
  • the bending load of SPV7 was 3.092 g.
  • Example 1 Preparation of TAC film with HC
  • a hardcourt layer forming material was prepared by adding cyclopentanone and propylene glycol monomethyl ether to the solution at a ratio of 45:55 so that the solid content concentration in the solution was 36%.
  • This hard coat layer forming material was applied onto a TAC film (thickness: 25 ⁇ m) so that the thickness of the hard coat layer after curing was 7 ⁇ m to form a coating film.
  • the coating film was dried at 90 ° C. for 1 minute, and further irradiated with ultraviolet rays having an integrated light intensity of 300 mJ / cm 2 with a high-pressure mercury lamp to cure the coating film to form a hard coat layer to prepare a TAC film with HC.
  • the obtained TAC film with HC was saponified.
  • a polarizing element having a thickness of 12 ⁇ m.
  • a TAC film with HC obtained above is placed on one side of the polarizing element, and a cycloolefin resin (COP) film (manufactured by Nippon Zeon Corporation, trade name "ZF14") is placed on the other side with a polyvinyl alcohol-based adhesive.
  • COP cycloolefin resin
  • ZF14 cycloolefin resin
  • optical laminate was punched into a rectangle having a size of 150 mm ⁇ 150 mm, and the four corners thereof were chamfered (deformed) into an R shape.
  • the irregular shape processing was performed by laser light irradiation. Specifically, the laser beam was irradiated from the separator side under the following conditions. The radius of curvature of the chamfered portion (R shape) was 5 mm.
  • the surface protective film in the obtained optical laminate has an upper end extending outward from the lower end, and the extending length is 35. It was .1 ⁇ m.
  • the obtained optical laminate was subjected to the evaluation of (3) above. The results are shown in Table 1.
  • Examples 2 to 3> A deformed optical laminate was obtained in the same manner as in Example 1 except that the radius of curvature of the chamfered portion (R shape) was changed as shown in Table 1. The upper end of the surface protective film in the obtained optical laminate extended outward from the lower end. The extension length is shown in Table 1. Further, the obtained optical laminate was subjected to the same evaluation as in Example 1. The results are shown in Table 1.
  • Example 4 An optical laminate was obtained in the same manner as in Example 1.
  • the obtained optical laminate was punched into a rectangle having a size of 150 mm ⁇ 150 mm, and the four corners thereof were chamfered (deformed) into an R shape. Deformation was performed by cutting the end mill. More specifically, a bundle of optical laminates stacked to a height of 50 mm with the surface protective film facing up was fixed with a clamp, and cut using an end mill having a blade diameter of 5.0 mm and a helix angle of 45 °. The rotation speed of the blade during cutting was 38000 rpm, and the feed rate was 1250 mm / min. The radius of curvature of the chamfered portion (R shape) was 6.5 mm.
  • the surface protective film in the obtained optical laminate had an upper end extending outward from the lower end, and the extending length was 7.2 ⁇ m.
  • the obtained optical laminate was subjected to the same evaluation as in Example 1. The results are shown in Table 1.
  • Example 1 except that the surface protective film shown in Table 1 was used and the chamfered portion (R shape) shown in Table 1 was deformed with the radius of curvature, and the processing power of the laser was changed as shown in Table 1.
  • a deformed optical laminate was obtained.
  • the upper end of the surface protective film in the obtained optical laminate extended outward from the lower end.
  • the extension length is shown in Table 1.
  • the obtained optical laminate was subjected to the same evaluation as in Example 1. The results are shown in Table 1.
  • Table 1 The abbreviations in Table 1 are as follows. The blending amount of each component in Table 1 is the number of copies per 100 parts of the polymer. Further, the "defective peeling" in Table 1 means that when the surface protective film was to be peeled off via the pickup tape, the surface protective film was not peeled off and only the pickup tape was peeled off and could not be peeled off. Means that.
  • the bending load of the surface protective film is set to 2.5 g or less, so that the surface from the deformed portion to the surface is formed. Poor peeling when peeling the protective film can be remarkably suppressed. Further, as is clear from Comparative Examples 4 to 6, it can be seen that good peelability of the surface protective film can be realized by extending the upper end of the surface protective film to the outside from the lower end.
  • the optical laminate of the present invention is suitably used for an image display device, and particularly preferably used for an image display device having a deformed portion represented by an instrument panel of an automobile, a smartphone, a tablet PC or a smart watch. Can be.

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