WO2020079875A1 - Optical laminate with cover glass and image display device with cover glass - Google Patents

Optical laminate with cover glass and image display device with cover glass Download PDF

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Publication number
WO2020079875A1
WO2020079875A1 PCT/JP2019/019570 JP2019019570W WO2020079875A1 WO 2020079875 A1 WO2020079875 A1 WO 2020079875A1 JP 2019019570 W JP2019019570 W JP 2019019570W WO 2020079875 A1 WO2020079875 A1 WO 2020079875A1
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WO
WIPO (PCT)
Prior art keywords
cover glass
adhesive layer
optical
sensitive adhesive
pressure
Prior art date
Application number
PCT/JP2019/019570
Other languages
French (fr)
Japanese (ja)
Inventor
史枝 片山
哲郎 竹田
裕太 高瀬
章典 伊▲崎▼
Original Assignee
日東電工株式会社
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
Priority claimed from JP2019084162A external-priority patent/JP6795651B2/en
Application filed by 日東電工株式会社 filed Critical 日東電工株式会社
Priority to KR1020217008694A priority Critical patent/KR102390821B1/en
Priority to CN201980067678.2A priority patent/CN112868057B/en
Publication of WO2020079875A1 publication Critical patent/WO2020079875A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C3/00—Milling particular work; Special milling operations; Machines therefor
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
    • C03C17/34—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions
    • 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
    • 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
    • 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

Definitions

  • the present invention relates to an optical laminate with a cover glass and an image display device with a cover glass.
  • 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 layered product may be cut into a predetermined shape and then subjected to finishing by cutting. Furthermore, in recent years, it may be desired to process (deform) the optical laminated body to a shape other than a rectangle. In such cutting, cutting with an end mill may be performed. However, cracks may occur in the optical layered body cut by the end mill. Further, the optical laminated body may be provided in a state where cover glasses are laminated (optical laminated body with cover glass), but cracks may occur also in the optical laminated body with cover glass.
  • the present invention has been made to solve the above conventional problems, and its main purpose is to provide an optical laminate with a cover glass in which cracks are suppressed and an image with a cover glass including such an optical laminate with a cover glass. It is to provide a display device.
  • the optical laminate with a cover glass of the present invention has a cover glass, a first pressure-sensitive adhesive layer, an optical film and a second pressure-sensitive adhesive layer in this order, and the first pressure-sensitive adhesive layer is stored at -40 ° C.
  • the ratio G 1 ′ / G 2 ′ between the elastic modulus G 1 ′ and the storage elastic modulus G 2 ′ at ⁇ 40 ° C. of the second adhesive layer is 1 or more.
  • the storage modulus G 1 ′ of the first pressure-sensitive adhesive layer at ⁇ 40 ° C. is 5.0 ⁇ 10 6 (Pa) or more.
  • at least the optical film and the second pressure-sensitive adhesive layer of the optical laminate with a cover glass include a cut end surface having a cut mark.
  • the machined portion includes a recess when seen in a plan view.
  • the optical film comprises a polarizer.
  • the optical film further has a protective film on the first pressure-sensitive adhesive layer side of the polarizer.
  • a hard coat layer is formed on the protective film.
  • the elongation at break at 25 ° C of the protective film is 2 mm or more.
  • an image display device with a cover glass is provided. This image display device with a cover glass has a display cell and the optical laminated body with a cover glass arranged on the viewing side of the display cell.
  • the storage elastic modulus of the adhesive layer for laminating the cover glass and the optical film the storage elastic modulus of the adhesive layer for laminating the optical laminated body to the display cell.
  • FIG. 5 (a) is a schematic cross-sectional view seen from the axial direction for explaining another example of the cutting means used for cutting in the method for manufacturing an optical laminated body with a cover glass of the present invention
  • FIG. 5B is a schematic perspective view of the cutting means of FIG.
  • FIG. 1 is a schematic sectional view illustrating an optical laminate with a cover glass according to one embodiment of the present invention.
  • the optical laminated body 100 with a cover glass of the illustrated example has a cover glass 110, a first adhesive layer 120, an optical film 130, and a second adhesive layer 140 in this order.
  • the separator 150 is detachably temporarily attached to the surface of the second pressure-sensitive adhesive layer 140.
  • the optical laminated body with a cover glass of the present invention can be suitably applied to an image display device with a cover glass.
  • the optical laminated body with the cover glass is typically cut, and therefore includes a cutting end surface and may have cutting marks.
  • the optical laminated body with a cover glass may be entirely cut, or a part of the constituent elements may be cut.
  • a part of the constituent elements is cut, for example, a laminate of the optical film 130 and the second pressure-sensitive adhesive layer 140 (practically the separator 150) is cut, and the cut laminate is formed.
  • the body can be attached to the cover glass 110 via the first adhesive layer 120.
  • the optical laminated body with a cover glass has a recessed portion 160 when the machined portion is viewed in plan as shown in FIG. 2. Where cracks occur remarkably in such recesses, according to the embodiment of the present invention, cracks can be satisfactorily suppressed even in such recesses.
  • the optical film 130 may be any suitable optical film that can be used for applications that require cutting.
  • the optical film may be a film composed of a single layer or a laminate.
  • Specific examples of the optical film include a polarizer, a retardation film, a polarizing plate (typically, a laminate of a polarizer and a protective film), a conductive film for a touch panel, a surface-treated film, and for these purposes.
  • a laminate for example, a circularly polarizing plate for antireflection, a polarizing plate with a conductive layer for a touch panel
  • cracks can be remarkably suppressed particularly in an optical laminate with a cover glass including an optical film that easily shrinks, such as a polarizer.
  • the polarizing plate may have a protective film only on the first pressure-sensitive adhesive layer 120 side of the polarizer, and only on the second pressure-sensitive adhesive layer 140 side of the polarizer. May have a protective film, or may have protective films on both sides. According to the embodiment of the present invention, the effect of preventing cracks in the protective film provided on the first pressure-sensitive adhesive layer side is particularly remarkable.
  • the protective film provided on the first pressure-sensitive adhesive layer side may be subjected to surface treatment such as hard coat treatment, antireflection treatment, antisticking treatment, and antiglare treatment, if necessary.
  • the structure in which the hard coat treatment is applied to the protective film provided on the first pressure-sensitive adhesive layer side tends to be relatively prone to cracks. According to the embodiment of the present invention, cracks are generated even in such a structure. Can be satisfactorily prevented.
  • the protective film provided on the second pressure-sensitive adhesive layer side is preferably optically isotropic.
  • “optically isotropic” means that the in-plane retardation Re (550) is 0 nm to 10 nm and the thickness direction retardation Rth (550) is ⁇ 10 nm to +10 nm.
  • the protective film may also serve as a retardation layer.
  • the protective film may be a ⁇ / 2 plate, a ⁇ / 4 plate, or a laminate of these.
  • the ⁇ / 2 plate and the ⁇ / 4 plate typically have a refractive index characteristic of nx> ny ⁇ nz.
  • the ⁇ / 2 plate preferably has an in-plane retardation Re (550) of 180 nm to 320 nm, and the ⁇ / 4 plate preferably has an in-plane retardation Re (550) of 100 nm to 200 nm.
  • Re ( ⁇ ) is an in-plane retardation measured with light having a wavelength of ⁇ nm at 23 ° C.
  • Re (550) is an in-plane retardation measured with light having a wavelength of 550 nm at 23 ° C.
  • Rth ( ⁇ ) is a phase difference in the thickness direction measured with light having a wavelength of ⁇ nm at 23 ° C.
  • Rth (550) is the phase difference in the thickness direction measured with light having a wavelength of 550 nm at 23 ° C.
  • Nx is the refractive index in the direction in which the in-plane refractive index is maximum (that is, the slow axis direction)
  • ny is the direction in the plane that is orthogonal to the slow axis (that is, the fast axis direction).
  • nz is the refractive index in the thickness direction.
  • the protective film is formed of any appropriate film that can be used as a protective film for the polarizer.
  • the material serving as the main component of the film include cellulose resins such as triacetyl cellulose (TAC), polyester resins, polyvinyl alcohol resins, polycarbonate resins, polyamide resins, polyimide resins, polyether sulfone resins, and polysulfone resins.
  • TAC triacetyl cellulose
  • polyester resins polyvinyl alcohol resins
  • polycarbonate resins polyamide resins
  • polyimide resins polyether sulfone resins
  • polysulfone resins polysulfone resins.
  • thermosetting resin such as a (meth) acrylic resin, a urethane resin, a (meth) acrylic urethane resin, an epoxy resin, a silicone resin, or an ultraviolet curable resin
  • a glassy polymer such as a siloxane polymer may be used.
  • the polymer film described in JP 2001-343529 A (WO 01/37007) can also be used. Examples of the material of this film include a resin composition containing a thermoplastic resin having a substituted or unsubstituted imide group in the side chain and a thermoplastic resin having a substituted or unsubstituted phenyl group and a nitrile group in the side chain.
  • the polymer film can be, for example, an extruded product of the resin composition.
  • the protective film provided on the first pressure-sensitive adhesive layer side has a breaking elongation at 25 ° C of preferably 2 mm or more, and more preferably 50 mm or more.
  • the elongation at break can be, for example, 70 mm or less. If the breaking elongation of the protective film provided on the first pressure-sensitive adhesive layer side is in such a range, the effect of optimizing the relationship between the storage elastic moduli of the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer Due to the synergistic effect, cracking of the protective film is significantly prevented.
  • the elongation at break can be measured according to JIS K7113.
  • the first adhesive layer 120 is typically used to bond the cover glass and the optical film together.
  • the first pressure-sensitive adhesive layer 120 may be composed of any suitable pressure-sensitive adhesive as long as the storage elastic modulus G 1 ′ at ⁇ 40 ° C. falls within the desired range described below.
  • the first pressure-sensitive adhesive layer 120 can be typically composed of a rubber-based pressure-sensitive adhesive (rubber-based pressure-sensitive adhesive composition).
  • the rubber-based pressure-sensitive adhesive composition can typically include a butadiene polymer and / or a polyisoprene polymer (or a modified product thereof) and a photopolymerization initiator.
  • the rubber-based pressure-sensitive adhesive composition includes polystyrene, polyurethane (for example, one using isophorone diisocyanate as a raw material), polyurethane acrylate, polyisoprene-based acrylate or an esterified product thereof, terpene-based hydrogenated resin, reactive acrylic-based monomer (for example, 2 -Hydroxybutyl methacrylate, 4-hydroxyethyl acrylate, 2-ethylhexyl acrylate, dodecyl acrylate, isobornyl acrylate), a reactive methacrylic monomer (eg, dicyclopentenyloxyethyl methacrylate) and the like may be further contained.
  • polystyrene polyurethane (for example, one using isophorone diisocyanate as a raw material)
  • polyurethane acrylate for example, one using isophorone diisocyanate as a raw material
  • polyurethane acrylate poly
  • the rubber-based pressure-sensitive adhesive composition may preferably further include a silane coupling agent.
  • the silane coupling agent include epoxy group-containing silane coupling agents.
  • the rubber-based pressure-sensitive adhesive composition preferably does not contain a hydrocarbon component (for example, heptane).
  • the thickness of the first pressure-sensitive adhesive layer can be, for example, 10 ⁇ m to 50 ⁇ m.
  • the second adhesive layer 140 is typically used to bond the finally obtained optical laminate with a cover glass to a display cell.
  • the second pressure-sensitive adhesive layer 140 may typically be composed of an acrylic pressure-sensitive adhesive (acrylic pressure-sensitive adhesive composition).
  • the acrylic pressure-sensitive adhesive composition typically contains a (meth) acrylic polymer as a main component.
  • the (meth) acrylic polymer may be contained in the pressure-sensitive adhesive composition in a proportion of, for example, 50% by weight or more, preferably 70% by weight or more, more preferably 90% by weight or more, in the solid content of the adhesive composition.
  • the (meth) acrylic polymer contains an alkyl (meth) acrylate as a main component as a monomer unit.
  • (meth) acrylate refers to acrylate and / or methacrylate.
  • alkyl group of the alkyl (meth) acrylate include a linear or branched alkyl group having 1 to 18 carbon atoms. The average carbon number of the alkyl group is preferably 3 to 9.
  • the monomer constituting the (meth) acrylic polymer include a carboxyl group-containing monomer, a hydroxyl group-containing monomer, an amide group-containing monomer, and an aromatic ring-containing (meth) acrylate, in addition to the alkyl (meth) acrylate.
  • the acrylic pressure-sensitive adhesive composition may preferably contain a silane coupling agent and / or a crosslinking agent.
  • Examples of the silane coupling agent include epoxy group-containing silane coupling agents.
  • Examples of the cross-linking agent include isocyanate-based cross-linking agents and peroxide-based cross-linking agents.
  • the thickness of the second pressure-sensitive adhesive layer can be, for example, 10 ⁇ m to 50 ⁇ m. Details of the second pressure-sensitive adhesive layer or the acrylic pressure-sensitive adhesive composition are described in, for example, JP-A-2016-190996, and the description of the publication is incorporated herein by reference.
  • the ratio G 1 between the first storage modulus at -40 °C of the adhesive layer 120 G 1 'and the storage modulus G 2 at -40 °C second adhesive layer 140' “/ G 2 ” is 1 or more, preferably 3 or more, and more preferably 20 or more.
  • the ratio G 1 '/ G 2 ' is 1 or more, cracks in the polarizing plate with the cover glass (substantially, cracks in the optical film: especially cracks after the heat cycle test) can be suppressed well.
  • the ratio G 1 ′ / G 2 ′ can be, for example, 300 or less. The details are as follows.
  • the storage elastic modulus of the first adhesive layer When the storage elastic modulus of the first adhesive layer is low (soft), the movement of contraction of the polarizer cannot be suppressed, and thus the protective film on the first adhesive layer side (the protective film on the visible side of the polarizer). ) May be cracked (the storage elastic modulus of the first pressure-sensitive adhesive layer will be described later).
  • the storage elastic modulus of the first pressure-sensitive adhesive layer by increasing the storage elastic modulus of the first pressure-sensitive adhesive layer (making it harder, as a result, G 1 ′ / G 2 ′> 1), the dimensional change of the polarizer is suppressed.
  • the ratio G 1 ′ / G 2 ′ may be as high as 1-2.
  • the storage modulus G 1 ′ of the first pressure-sensitive adhesive layer at ⁇ 40 ° C. is preferably 5.0 ⁇ 10 6 (Pa) or more, more preferably 1.0 ⁇ 10 7 (Pa) or more, It is more preferably 1.0 ⁇ 10 8 (Pa) or more, and particularly preferably 1.5 ⁇ 10 8 (Pa) or more.
  • the storage elastic modulus G 1 ′ can be, for example, 5.0 ⁇ 10 9 (Pa) or less. In the polarizing plate with a cover glass, the storage elastic modulus G 1 ′ is so large (the first pressure-sensitive adhesive layer is hard) and the ratio G 1 ′ / G 2 ′ satisfies the above relationship. Cracks can be suppressed even better.
  • the storage modulus G 2 ′ of the second pressure-sensitive adhesive layer at ⁇ 40 ° C. is preferably 1.0 ⁇ 10 5 (Pa) or more, more preferably 1.0 ⁇ 10 7 (Pa) or more, It is more preferably 1.0 ⁇ 10 8 (Pa) or more, and particularly preferably 1.0 ⁇ 10 8 (Pa) or more.
  • the storage elastic modulus G 2 ′ can be, for example, 1.0 ⁇ 10 9 (Pa) or less. When the storage elastic modulus G 2 ′ is in such a range, it is easy to set the ratio G 1 ′ / G 2 ′ to a desired value.
  • cover glass 110 may have a configuration well known in the industry, a detailed description thereof will be omitted.
  • each step in the manufacturing method of the optical laminate with a cover glass having a planar shape as shown in FIG. 2 will be described as an example.
  • an embodiment in which a laminate of an optical film and a second pressure-sensitive adhesive layer (practically a separator) (hereinafter referred to as an optical laminate) is subjected to cutting processing will be described.
  • FIG. 3 is a schematic perspective view for explaining the cutting process, and the workpiece 1 is shown in this figure.
  • a work 1 is formed by stacking a plurality of optical laminates.
  • the optical laminate is typically cut into any appropriate shape when forming a work.
  • the optical layered product may be cut into a rectangular shape, may be cut into a shape similar to the rectangular shape, or may be cut into an appropriate shape (for example, a circle) according to the purpose. Good.
  • the optical laminated body is cut into a rectangular shape, and the work 1 has outer peripheral surfaces (cutting surfaces) 1a and 1b facing each other and outer peripheral surfaces (cutting surfaces) 1c and 1d orthogonal to them. There is.
  • the work 1 is preferably clamped from above and below by a clamp means (not shown).
  • the total thickness of the work is preferably 8 mm to 20 mm, more preferably 9 mm to 15 mm, and further preferably about 10 mm. With such a thickness, it is possible to prevent damage due to the pressing by the clamp means or the impact during cutting.
  • the optical laminates are stacked so that the works have such a total thickness.
  • the number of optical laminates constituting the work may be, for example, 10 to 50.
  • the clamp means eg, jig
  • the clamp means may be made of a soft material or a hard material. When it is made of a soft material, its hardness (JIS A) is preferably 60 ° to 80 °. If the hardness is too high, the pressing trace by the clamp means may remain. If the hardness is too low, the jig may be deformed to cause positional deviation, resulting in insufficient cutting accuracy.
  • the outer peripheral surface of the work 1 is cut by the cutting means 20.
  • the cutting is performed by bringing the cutting blade of the cutting means into contact with the outer peripheral surface of the work 1.
  • the cutting may be performed over the entire circumference of the outer peripheral surface of the work, or may be performed only at a predetermined position.
  • cutting is typically performed over the entire circumference of the outer peripheral surface of the work.
  • the cutting for forming the concave portion may be further performed.
  • Cutting is typically so-called end milling, as shown in FIGS. 3 to 5. That is, the outer peripheral surface of the work 1 is cut using the side surface of the cutting means (end mill) 20.
  • a straight end mill can be typically used as the cutting means (end mill) 20.
  • the end mill 20 includes a rotary shaft 21 extending in the stacking direction (vertical direction) of the works 1, and a cutting blade 22 configured as an outermost diameter of a main body rotating about the rotary shaft 21.
  • the cutting blade 22 may be configured as an outermost diameter twisted along the rotating shaft 21 as shown in FIG. 4 (may have a predetermined helix angle), and as shown in FIG. It may be configured to extend in a direction substantially parallel to 21 (the twist angle may be 0 °). It should be noted that “0 °” means substantially 0 °, and also includes a case where a slight angle twist is caused by a processing error or the like.
  • the helix angle is preferably 70 ° or less, more preferably 65 ° or less, and further preferably 45 ° or less.
  • the cutting blade 22 includes a cutting edge 22a, a rake surface 22b, and a relief surface 22c.
  • the number of blades of the cutting blade 22 can be appropriately set as long as a desired number of contacts described later can be obtained. Although the number of blades in FIG. 4 is three and the number of blades in FIG. 5 is two, the number of blades may be one, four, or five or more. Preferably, the number of blades is two. With such a configuration, the rigidity of the blade is ensured and the pocket is secured, so that the scraps can be satisfactorily discharged.
  • the HV hardness of the cutting blade 22 is typically 1500 or higher, preferably 1700 or higher, and more preferably 2000 or higher.
  • the upper limit of HV hardness may be, for example, 2350.
  • the cutting blade is typically made of cemented carbide.
  • Cemented carbide is typically obtained by sintering metal carbide powder.
  • Specific examples of the cemented carbide include WC-Co based alloys, WC-TiC-Co based alloys, WC-TaC-Co based alloys and WC-TiC-TaC-Co based alloys.
  • the HV hardness is also called Vickers hardness and can be measured according to JIS Z 2244.
  • the HV hardness of the cutting blade 22 is typically 7,000 or more, preferably 8,000 or more, more preferably 9000 or more, and further preferably 10,000 or more.
  • the upper limit of HV hardness may be, for example, 15,000.
  • the cutting blade typically comprises sintered diamond. More specifically, the cutting blade has a sintered diamond layer formed on a base portion made of cemented carbide.
  • Sintered diamond is a polycrystalline diamond in which small diamond particles are hardened at high temperature and high pressure together with metal and / or ceramic powder.
  • the cutting conditions can be set appropriately according to the purpose. For example, by appropriately adjusting the feed speed, the number of rotations, the number of blades, etc. of the end mill, it is possible to satisfactorily cut even an optical laminate including an adhesive layer.
  • the "feed rate" means the relative speed between the cutting means (end mill) and the work. Therefore, in the cutting process, only the end mill may be moved, only the work may be moved, or both the end mill and the work may be moved.
  • the number of cuts can be one cut, two cuts, three cuts or more.
  • the diameter of the end mill 20 is preferably 3 mm to 20 mm.
  • the cut optical laminate (substantially the optical film and the pressure-sensitive adhesive layer) may typically have cutting marks.
  • An optical laminated body with a cover glass can be obtained by bonding the obtained optical laminated body to a cover glass via the first adhesive layer.
  • the optical laminated body with the cover glass may be subjected to cutting processing.
  • the optical laminate with a cover glass according to the embodiment of the present invention (for example, the optical laminate with a cover glass according to the above items A to B) is used as an image display with a cover glass as described above. It can be suitably applied. Therefore, an image display device with a cover glass is also included in the embodiments of the present invention.
  • the image display device with a cover glass includes a display cell and an optical laminate with a cover glass according to the embodiment of the present invention, which is arranged on the viewing side of the display cell.
  • Examples of the image display device include a liquid crystal display device, an organic electroluminescence (EL) display device, and a quantum dot display device.
  • EL organic electroluminescence
  • the number of cracks in the three samples was defined as the crack occurrence frequency (F / 3 pcs). Furthermore, the size of the crack was measured by transmission observation at a magnification of 50 times using an optical microscope, and the size of the largest crack was defined as the crack size ( ⁇ m).
  • Example 1 By a conventional method, the surface protective film (48 ⁇ m) / hard coat layer (5 ⁇ m) / cycloolefin-based protective film (47 ⁇ m) / polarizer (5 ⁇ m) / cycloolefin-based protective film (24 ⁇ m) / second adhesive, in order from the viewer side.
  • a pressure-sensitive adhesive layer-attached polarizing plate having a composition of an agent layer (20 ⁇ m) / separator was produced.
  • the second pressure-sensitive adhesive layer was produced according to [0121] and [0124] of JP-A-2016-190996.
  • the storage elastic modulus G 2 ′ of the second pressure-sensitive adhesive layer at ⁇ 40 ° C.
  • the obtained polarizing plate with an adhesive layer was punched into a shape similar to that shown in FIG. 2 (a rectangular shape having an approximate size of 142.0 mm ⁇ 66.8 mm, a shape having no recess), and a plurality of the polarizing plates with an adhesive layer were punched out.
  • the sheets were stacked to form a work (total thickness of about 10 mm).
  • the peripheral portion was cut by end milling and recesses were formed, and a polarizing plate with a pressure-sensitive adhesive layer was obtained as shown in FIG.
  • the cutting blade of the end mill was made of sintered diamond and had an HV hardness of 10,000.
  • the number of blades of the end mill was 2, and the twist angle was 0 °. Further, the feed rate of the end mill (the feed rate when cutting a straight line portion) is 1000 mm / min, the rotation speed is 25000 rpm, and the number of times of cutting is 2 times (first cutting of 0.1 mm, second cutting of 0.2 mm). The margin was 0.3 mm).
  • the surface protective film of the polarizing plate with the pressure-sensitive adhesive layer was peeled off, and the first pressure-sensitive adhesive layer was formed on the peeled surface.
  • the first pressure-sensitive adhesive layer was produced according to [0053] in JP-A-2016-103030.
  • the storage elastic modulus G 1 ′ of the first pressure-sensitive adhesive layer at ⁇ 40 ° C. was 1.7 ⁇ 10 8 (Pa).
  • the polarizing plate with an adhesive layer was attached to a cover glass manufactured by Matsunami Glass Industry through the formed first adhesive layer to obtain a polarizing plate with a cover glass (optical laminate with a cover glass). Further, the separator temporarily attached to the second pressure-sensitive adhesive layer was peeled off, a glass plate was attached to the second pressure-sensitive adhesive layer, and the cracks were evaluated. The results are shown in Table 1.
  • Examples 2 to 8 and Comparative Examples 1 to 5 The formulation of the pressure-sensitive adhesive composition constituting the first pressure-sensitive adhesive layer was changed so that the storage elastic modulus G 1 ′ at ⁇ 40 ° C. was as shown in Table 1, and the pressure-sensitive adhesive constituting the second pressure-sensitive adhesive layer. The formulation of the composition was changed so that the storage modulus G 2 'at -40 ° C was as shown in Table 1, and for Examples 7 to 8 and Comparative Examples 2 to 5, the helix angle of the cutting edge of the end mill was changed. A polarizing plate with a cover glass which was cut as shown in FIG. 2 was obtained in the same manner as in Example 1 except that the angle was 30 °.
  • Example 2 [0100] and [0110] of JP2011-175247A
  • Example 3 (E) of [0085] of JP-A-2017-075998
  • Example 4 [0103] of JP-A-2014-156552
  • Example 5 [0121] and [0124] of JP-A-2016-190996.
  • Example 6 [0065] of JP-A-2016-060674.
  • Example 7 Same as Example 1
  • Example 8 Same as Example 5
  • Comparative Example 1 Table 1 (Example 1) of [0048] in JP 2012-046658 A.
  • Comparative Example 2 [0149], [0150] and [0153] of Japanese Patent No. 5038224 (Example 1).
  • Comparative Example 3 Same as Example 1
  • Comparative Example 4 Same as Comparative Example 1
  • Comparative Example 5 Same as Comparative Example 1
  • the second pressure-sensitive adhesive layer in each Example and Comparative Example was prepared according to the description in the following publication. .
  • Example 2 Same as Example 1
  • Example 3 Same as Example 1
  • Example 4 Same as Example 1
  • Example 5 Same as Example 1
  • Example 6 Same as Example 1
  • Example 7 Example Same as Example 1
  • Example 8 [0149], [0150] and [0153] of Patent No. 5038224 (Example 1)
  • Comparative Example 1 Same as Example 1 Comparative Example 2: Same as Example 1 Comparative Example 3: [0135] and [0136] of Patent No. 4820443 (Example 1).
  • Comparative Example 4 Same as Example 8 Comparative Example 5: Same as Example 1.
  • the optical laminated body with a cover glass of the present invention is preferably used when a cover glass is provided on the image display section, and in particular, a rectangular image display section represented by a personal computer (PC) or a tablet terminal, and / or It can be suitably used for an odd-shaped image display section represented by an automobile instrument panel or a smart watch.
  • a cover glass represented by a personal computer (PC) or a tablet terminal
  • PC personal computer
  • a tablet terminal / or It can be suitably used for an odd-shaped image display section represented by an automobile instrument panel or a smart watch.

Abstract

Provided are: an optical laminate with a cover glass which is less susceptible to cracking; and an image display device which is provided with a cover glass and comprises said optical laminate with a cover glass. This optical laminate with a cover glass has a cover glass, a first adhesive layer, an optical film, and a second adhesive layer in this order, wherein the ratio G1'/G2' of a storage elastic modulus G1' of the first adhesive layer at -40 °C to a storage elastic modulus G2' of the second adhesive layer at -40 °C is 1 or more. This image display device with a cover glass has: a display cell; and an optical laminate of the present invention, the optical laminate being provided with a cover glass and disposed on a visible side of the display cell.

Description

カバーガラス付光学積層体およびカバーガラス付画像表示装置Optical laminated body with cover glass and image display device with cover glass
　本発明は、カバーガラス付光学積層体およびカバーガラス付画像表示装置に関する。 The present invention relates to an optical laminate with a cover glass and an image display device with a cover glass.
　携帯電話、ノート型パーソナルコンピューター等の画像表示装置には、画像表示を実現し、および／または当該画像表示の性能を高めるために、種々の光学積層体（例えば、偏光板）が使用されている。光学積層体は、所定形状に切断された後、切断面を切削による仕上げ加工に供する場合がある。さらに、近年、光学積層体を矩形以外に加工（異形加工）することが望まれる場合がある。このような切削加工においては、エンドミルによる切削が行われる場合がある。しかし、エンドミルにより切削加工された光学積層体は、クラックが発生する場合がある。さらに、光学積層体はカバーガラスを積層した状態（カバーガラス付光学積層体）で提供される場合があるところ、カバーガラス付光学積層体においてもクラックが発生する場合がある。 Various optical laminates (for example, polarizing plates) are used in 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 layered product may be cut into a predetermined shape and then subjected to finishing by cutting. Furthermore, in recent years, it may be desired to process (deform) the optical laminated body to a shape other than a rectangle. In such cutting, cutting with an end mill may be performed. However, cracks may occur in the optical layered body cut by the end mill. Further, the optical laminated body may be provided in a state where cover glasses are laminated (optical laminated body with cover glass), but cracks may occur also in the optical laminated body with cover glass.
特開２００７－１８７７８１号公報JP-A-2007-187781 特開２０１８－０２２１４０号公報Japanese Patent Laid-Open No. 2018-022140
　本発明は上記従来の課題を解決するためになされたものであり、その主たる目的は、クラックの抑制されたカバーガラス付光学積層体およびこのようなカバーガラス付光学積層体を含むカバーガラス付画像表示装置を提供することにある。 The present invention has been made to solve the above conventional problems, and its main purpose is to provide an optical laminate with a cover glass in which cracks are suppressed and an image with a cover glass including such an optical laminate with a cover glass. It is to provide a display device.
　本発明のカバーガラス付光学積層体は、カバーガラスと第１の粘着剤層と光学フィルムと第２の粘着剤層とをこの順に有し、該第１の粘着剤層の－４０℃における貯蔵弾性率Ｇ１’と該第２の粘着剤層の－４０℃における貯蔵弾性率Ｇ２’との比Ｇ１’／Ｇ２’が１以上である。
　１つの実施形態においては、上記第１の粘着剤層の－４０℃における貯蔵弾性率Ｇ１’は５．０×１０６（Ｐａ）以上である。
　１つの実施形態においては、上記カバーガラス付光学積層体は、少なくとも上記光学フィルムおよび上記第２の粘着剤層が切削痕を有する切削端面を含む。
　１つの実施形態においては、上記切削加工された部分は、平面視した場合に凹部を含む。
　１つの実施形態においては、上記光学フィルムは偏光子を含む。１つの実施形態においては、上記光学フィルムは、上記偏光子の上記第１の粘着剤層側に保護フィルムをさらに有する。
　１つの実施形態においては、上記保護フィルムにはハードコート層が形成されている。
　１つの実施形態においては、上記保護フィルムの２５℃における破断伸びは２ｍｍ以上である。
　本発明の別の局面によれば、カバーガラス付画像表示装置が提供される。このカバーガラス付画像表示装置は、表示セルと、該表示セルの視認側に配置された上記のカバーガラス付光学積層体と、を有する。 The optical laminate with a cover glass of the present invention has a cover glass, a first pressure-sensitive adhesive layer, an optical film and a second pressure-sensitive adhesive layer in this order, and the first pressure-sensitive adhesive layer is stored at -40 ° C. The ratio G 1 ′ / G 2 ′ between the elastic modulus G 1 ′ and the storage elastic modulus G 2 ′ at −40 ° C. of the second adhesive layer is 1 or more.
In one embodiment, the storage modulus G 1 ′ of the first pressure-sensitive adhesive layer at −40 ° C. is 5.0 × 10 6 (Pa) or more.
In one embodiment, at least the optical film and the second pressure-sensitive adhesive layer of the optical laminate with a cover glass include a cut end surface having a cut mark.
In one embodiment, the machined portion includes a recess when seen in a plan view.
In one embodiment, the optical film comprises a polarizer. In one embodiment, the optical film further has a protective film on the first pressure-sensitive adhesive layer side of the polarizer.
In one embodiment, a hard coat layer is formed on the protective film.
In one embodiment, the elongation at break at 25 ° C of the protective film is 2 mm or more.
According to another aspect of the present invention, an image display device with a cover glass is provided. This image display device with a cover glass has a display cell and the optical laminated body with a cover glass arranged on the viewing side of the display cell.
　本発明の実施形態によれば、カバーガラス付光学積層体において、カバーガラスと光学フィルムとを貼り合わせる粘着剤層の貯蔵弾性率を、光学積層体を表示セルに貼り合わせる粘着剤層の貯蔵弾性率以上とすることにより、クラック（実質的には、光学フィルムのクラック：特に、ヒートサイクル試験後のクラック）を抑制することができる。 According to the embodiment of the present invention, in the optical laminated body with the cover glass, the storage elastic modulus of the adhesive layer for laminating the cover glass and the optical film, the storage elastic modulus of the adhesive layer for laminating the optical laminated body to the display cell. By setting the ratio to be equal to or higher than the above rate, cracks (substantially, cracks in the optical film: especially cracks after the heat cycle test) can be suppressed.
本発明の１つの実施形態によるカバーガラス付光学積層体を説明する概略断面図である。It is a schematic sectional drawing explaining the optical laminated body with a cover glass by one Embodiment of this invention. 本発明の切削加工されたカバーガラス付光学積層体の形状の一例を示す概略平面図である。It is a schematic plan view which shows an example of the shape of the optical laminated body with the cover glass by which the cutting process of this invention was carried out. 本発明のカバーガラス付光学積層体の切削加工の一例を説明するための概略斜視図である。It is a schematic perspective view for demonstrating an example of the cutting process of the optical laminated body with a cover glass of this invention. 本発明のカバーガラス付光学積層体の製造方法における切削加工に用いられる切削手段の一例を説明するための概略斜視図である。It is a schematic perspective view for explaining an example of a cutting means used for cutting in the manufacturing method of the optical laminated body with a cover glass of the present invention. 図５（ａ）は、本発明のカバーガラス付光学積層体の製造方法における切削加工に用いられる切削手段の別の例を説明するための軸方向から見た概略断面図であり；図５（ｂ）は、図５（ａ）の切削手段の概略斜視図である。FIG. 5 (a) is a schematic cross-sectional view seen from the axial direction for explaining another example of the cutting means used for cutting in the method for manufacturing an optical laminated body with a cover glass of the present invention; FIG. 5B is a schematic perspective view of the cutting means of FIG.
　以下、図面を参照して本発明の具体的な実施形態について説明するが、本発明はこれらの実施形態には限定されない。なお、見やすくするために図面は模式的に表されており、さらに、図面における長さ、幅、厚み等の比率、ならびに角度等は、実際とは異なっている。 Hereinafter, specific embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited to these embodiments. It should be noted that the drawings are schematically shown for easy understanding, and the ratios of lengths, widths, thicknesses, and the like, angles, and the like in the drawings are different from actual ones.
Ａ．光学積層体
　図１は、本発明の１つの実施形態によるカバーガラス付光学積層体を説明する概略断面図である。図示例のカバーガラス付光学積層体１００は、カバーガラス１１０と第１の粘着剤層１２０と光学フィルム１３０と第２の粘着剤層１４０とをこの順に有する。実用的には、第２の粘着剤層１４０の表面にはセパレーター１５０が剥離可能に仮着されている。本発明のカバーガラス付光学積層体は、カバーガラス付画像表示装置に好適に適用され得る。 A. Optical Laminate FIG. 1 is a schematic sectional view illustrating an optical laminate with a cover glass according to one embodiment of the present invention. The optical laminated body 100 with a cover glass of the illustrated example has a cover glass 110, a first adhesive layer 120, an optical film 130, and a second adhesive layer 140 in this order. Practically, the separator 150 is detachably temporarily attached to the surface of the second pressure-sensitive adhesive layer 140. The optical laminated body with a cover glass of the present invention can be suitably applied to an image display device with a cover glass.
　本発明の実施形態によるカバーガラス付光学積層体は、代表的には切削加工されており、したがって切削端面を含み、切削痕を有し得る。カバーガラス付光学積層体は、全体が切削加工されていてもよく、構成要素の一部が切削加工されていてもよい。構成要素の一部が切削加工されている場合、例えば、光学フィルム１３０と第２の粘着剤層１４０と（実用的にはセパレーター１５０と）の積層体が切削加工され、当該切削加工された積層体が、第１の粘着剤層１２０を介してカバーガラス１１０に貼り合わせられ得る。１つの実施形態においては、カバーガラス付光学積層体は、図２に示すように、切削加工された部分が平面視した場合に凹部１６０を有する。このような凹部においてクラックの発生が顕著であるところ、本発明の実施形態によれば、このような凹部においてもクラックを良好に抑制することができる。 The optical laminated body with the cover glass according to the embodiment of the present invention is typically cut, and therefore includes a cutting end surface and may have cutting marks. The optical laminated body with a cover glass may be entirely cut, or a part of the constituent elements may be cut. When a part of the constituent elements is cut, for example, a laminate of the optical film 130 and the second pressure-sensitive adhesive layer 140 (practically the separator 150) is cut, and the cut laminate is formed. The body can be attached to the cover glass 110 via the first adhesive layer 120. In one embodiment, the optical laminated body with a cover glass has a recessed portion 160 when the machined portion is viewed in plan as shown in FIG. 2. Where cracks occur remarkably in such recesses, according to the embodiment of the present invention, cracks can be satisfactorily suppressed even in such recesses.
　光学フィルム１３０としては、切削加工が必要とされる用途に用いられ得る任意の適切な光学フィルムが挙げられる。光学フィルムは、単一層で構成されるフィルムであってもよく、積層体であってもよい。光学フィルムの具体例としては、偏光子、位相差フィルム、偏光板（代表的には、偏光子と保護フィルムとの積層体）、タッチパネル用導電性フィルム、表面処理フィルム、ならびに、これらを目的に応じて適切に積層した積層体（例えば、反射防止用円偏光板、タッチパネル用導電層付偏光板）が挙げられる。本発明の実施形態によれば、特に、偏光子のような収縮しやすい光学フィルムを含むカバーガラス付光学積層体においてクラックを顕著に抑制することができる。 The optical film 130 may be any suitable optical film that can be used for applications that require cutting. The optical film may be a film composed of a single layer or a laminate. Specific examples of the optical film include a polarizer, a retardation film, a polarizing plate (typically, a laminate of a polarizer and a protective film), a conductive film for a touch panel, a surface-treated film, and for these purposes. A laminate (for example, a circularly polarizing plate for antireflection, a polarizing plate with a conductive layer for a touch panel) appropriately laminated may be used. According to the embodiments of the present invention, cracks can be remarkably suppressed particularly in an optical laminate with a cover glass including an optical film that easily shrinks, such as a polarizer.
　例えば光学フィルム１３０が偏光板である場合、当該偏光板は偏光子の第１の粘着剤層１２０側のみに保護フィルムを有していてもよく、偏光子の第２の粘着剤層１４０側のみに保護フィルムを有していてもよく、両側に保護フィルムを有していてもよい。本発明の実施形態によれば、特に、第１の粘着剤層側に設けられる保護フィルムのクラックの防止効果が顕著である。第１の粘着剤層側に設けられる保護フィルムには、必要に応じて、ハードコート処理、反射防止処理、スティッキング防止処理、アンチグレア処理等の表面処理が施されていてもよい。特に、第１の粘着剤層側に設けられる保護フィルムにハードコート処理を施した構成は比較的クラックが入り易い傾向にあるところ、本発明の実施形態によれば、このような構成においてもクラックを良好に防止することができる。第２の粘着剤層側に設けられる保護フィルムは、１つの実施形態においては、光学的に等方性であることが好ましい。本明細書において「光学的に等方性である」とは、面内位相差Ｒｅ（５５０）が０ｎｍ～１０ｎｍであり、厚み方向の位相差Ｒｔｈ（５５０）が－１０ｎｍ～＋１０ｎｍであることをいう。当該保護フィルムは、別の実施形態においては、位相差層を兼ねてもよい。位相差層としての保護フィルムの構成は、目的に応じて任意の適切な構成が採用され得る。例えば、保護フィルムは、λ／２板であってもよく、λ／４板であってもよく、これらの積層体であってもよい。λ／２板およびλ／４板は、代表的にはｎｘ＞ｎｙ≧ｎｚの屈折率特性を有する。λ／２板は、面内位相差Ｒｅ（５５０）が好ましくは１８０ｎｍ～３２０ｎｍであり、λ／４板は、面内位相差Ｒｅ（５５０）が好ましくは１００ｎｍ～２００ｎｍである。また例えば、保護フィルムは、ネガティブＢプレート（ｎｘ＞ｎｙ＞ｎｚ）とポジティブＣプレート（ｎｚ＞ｎｘ＝ｎｙ）との積層体であってもよい。なお、本明細書において「Ｒｅ（λ）」は、２３℃における波長λｎｍの光で測定した面内位相差である。例えば、「Ｒｅ（５５０）」は、２３℃における波長５５０ｎｍの光で測定した面内位相差である。Ｒｅ（λ）は、層（フィルム）の厚みをｄ（ｎｍ）としたとき、式：Ｒｅ（λ）＝（ｎｘ－ｎｙ）×ｄによって求められる。「Ｒｔｈ（λ）」は、２３℃における波長λｎｍの光で測定した厚み方向の位相差である。例えば、「Ｒｔｈ（５５０）」は、２３℃における波長５５０ｎｍの光で測定した厚み方向の位相差である。Ｒｔｈ（λ）は、層（フィルム）の厚みをｄ（ｎｍ）としたとき、式：Ｒｔｈ（λ）＝（ｎｘ－ｎｚ）×ｄによって求められる。「ｎｘ」は面内の屈折率が最大になる方向（すなわち、遅相軸方向）の屈折率であり、「ｎｙ」は面内で遅相軸と直交する方向（すなわち、進相軸方向）の屈折率であり、「ｎｚ」は厚み方向の屈折率である。 For example, when the optical film 130 is a polarizing plate, the polarizing plate may have a protective film only on the first pressure-sensitive adhesive layer 120 side of the polarizer, and only on the second pressure-sensitive adhesive layer 140 side of the polarizer. May have a protective film, or may have protective films on both sides. According to the embodiment of the present invention, the effect of preventing cracks in the protective film provided on the first pressure-sensitive adhesive layer side is particularly remarkable. The protective film provided on the first pressure-sensitive adhesive layer side may be subjected to surface treatment such as hard coat treatment, antireflection treatment, antisticking treatment, and antiglare treatment, if necessary. In particular, the structure in which the hard coat treatment is applied to the protective film provided on the first pressure-sensitive adhesive layer side tends to be relatively prone to cracks. According to the embodiment of the present invention, cracks are generated even in such a structure. Can be satisfactorily prevented. In one embodiment, the protective film provided on the second pressure-sensitive adhesive layer side is preferably optically isotropic. In the present specification, “optically isotropic” means that the in-plane retardation Re (550) is 0 nm to 10 nm and the thickness direction retardation Rth (550) is −10 nm to +10 nm. Say. In another embodiment, the protective film may also serve as a retardation layer. As the constitution of the protective film as the retardation layer, any suitable constitution can be adopted depending on the purpose. For example, the protective film may be a λ / 2 plate, a λ / 4 plate, or a laminate of these. The λ / 2 plate and the λ / 4 plate typically have a refractive index characteristic of nx> ny ≧ nz. The λ / 2 plate preferably has an in-plane retardation Re (550) of 180 nm to 320 nm, and the λ / 4 plate preferably has an in-plane retardation Re (550) of 100 nm to 200 nm. Further, for example, the protective film may be a laminate of a negative B plate (nx> ny> nz) and a positive C plate (nz> nx = ny). In the present specification, “Re (λ)” is an in-plane retardation measured with light having a wavelength of λ nm at 23 ° C. For example, “Re (550)” is an in-plane retardation measured with light having a wavelength of 550 nm at 23 ° C. Re (λ) is calculated by the formula: Re (λ) = (nx−ny) × d, where d (nm) is the thickness of the layer (film). “Rth (λ)” is a phase difference in the thickness direction measured with light having a wavelength of λ nm at 23 ° C. For example, “Rth (550)” is the phase difference in the thickness direction measured with light having a wavelength of 550 nm at 23 ° C. Rth (λ) is calculated by the formula: Rth (λ) = (nx−nz) × d when the thickness of the layer (film) is d (nm). “Nx” is the refractive index in the direction in which the in-plane refractive index is maximum (that is, the slow axis direction), and “ny” is the direction in the plane that is orthogonal to the slow axis (that is, the fast axis direction). , And “nz” is the refractive index in the thickness direction.
　保護フィルムは、偏光子の保護フィルムとして使用できる任意の適切なフィルムで形成される。当該フィルムの主成分となる材料の具体例としては、トリアセチルセルロース（ＴＡＣ）等のセルロース系樹脂や、ポリエステル系、ポリビニルアルコール系、ポリカーボネート系、ポリアミド系、ポリイミド系、ポリエーテルスルホン系、ポリスルホン系、ポリスチレン系、ポリノルボルネン系、ポリオレフィン系、（メタ）アクリル系、アセテート系等の透明樹脂等が挙げられる。また、（メタ）アクリル系、ウレタン系、（メタ）アクリルウレタン系、エポキシ系、シリコーン系等の熱硬化型樹脂または紫外線硬化型樹脂等も挙げられる。この他にも、例えば、シロキサン系ポリマー等のガラス質系ポリマーも挙げられる。また、特開２００１－３４３５２９号公報（ＷＯ０１／３７００７）に記載のポリマーフィルムも使用できる。このフィルムの材料としては、例えば、側鎖に置換または非置換のイミド基を有する熱可塑性樹脂と、側鎖に置換または非置換のフェニル基ならびにニトリル基を有する熱可塑性樹脂を含有する樹脂組成物が使用でき、例えば、イソブテンとＮ－メチルマレイミドからなる交互共重合体と、アクリロニトリル・スチレン共重合体とを有する樹脂組成物が挙げられる。当該ポリマーフィルムは、例えば、上記樹脂組成物の押出成形物であり得る。 The protective film is formed of any appropriate film that can be used as a protective film for the polarizer. Specific examples of the material serving as the main component of the film include cellulose resins such as triacetyl cellulose (TAC), polyester resins, polyvinyl alcohol resins, polycarbonate resins, polyamide resins, polyimide resins, polyether sulfone resins, and polysulfone resins. , Polystyrene-based, polynorbornene-based, polyolefin-based, (meth) acrylic-based, acetate-based transparent resins and the like. Further, a thermosetting resin such as a (meth) acrylic resin, a urethane resin, a (meth) acrylic urethane resin, an epoxy resin, a silicone resin, or an ultraviolet curable resin can also be used. In addition to these, for example, a glassy polymer such as a siloxane polymer may be used. Further, the polymer film described in JP 2001-343529 A (WO 01/37007) can also be used. Examples of the material of this film include a resin composition containing a thermoplastic resin having a substituted or unsubstituted imide group in the side chain and a thermoplastic resin having a substituted or unsubstituted phenyl group and a nitrile group in the side chain. Can be used, and examples thereof include a resin composition having an alternating copolymer of isobutene and N-methylmaleimide and an acrylonitrile / styrene copolymer. The polymer film can be, for example, an extruded product of the resin composition.
　１つの実施形態においては、第１の粘着剤層側に設けられる保護フィルムは、２５℃における破断伸びが好ましくは２ｍｍ以上であり、より好ましくは５０ｍｍ以上である。当該破断伸びは、例えば７０ｍｍ以下であり得る。第１の粘着剤層側に設けられる保護フィルムの破断伸びがこのような範囲であれば、第１の粘着剤層と第２の粘着剤層の貯蔵弾性率の関係を最適化する効果との相乗的な効果により、当該保護フィルムのクラックが顕著に防止される。なお、破断伸びは、ＪＩＳ　Ｋ７１１３に準じて測定され得る。 In one embodiment, the protective film provided on the first pressure-sensitive adhesive layer side has a breaking elongation at 25 ° C of preferably 2 mm or more, and more preferably 50 mm or more. The elongation at break can be, for example, 70 mm or less. If the breaking elongation of the protective film provided on the first pressure-sensitive adhesive layer side is in such a range, the effect of optimizing the relationship between the storage elastic moduli of the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer Due to the synergistic effect, cracking of the protective film is significantly prevented. The elongation at break can be measured according to JIS K7113.
　第１の粘着剤層１２０は、代表的には、カバーガラスと光学フィルムとを貼り合わせるために用いられる。第１の粘着剤層１２０は、－４０℃における貯蔵弾性率Ｇ１’が後述の所望の範囲となる限りにおいて、任意の適切な粘着剤で構成され得る。第１の粘着剤層１２０は、代表的にはゴム系粘着剤（ゴム系粘着剤組成物）で構成され得る。ゴム系粘着剤組成物は、代表的には、ブタジエン重合体および／またはポリイソプレン重合体（またはその変性物）と光重合開始剤とを含み得る。ゴム系粘着剤組成物は、ポリスチレン、ポリウレタン（例えば、イソホロンジイソシアネートを原料とするもの）、ポリウレタンアクリレート、ポリイソプレン系アクリレートまたはそのエステル化物、テルペン系水素添加樹脂、反応性アクリル系モノマー（例えば、２－ヒドロキシブチルメタクリレート、４－ヒドロキシエチルアクリレート、２－エチルヘキシルアクリレート、ドデシルアクリレート、イソボルニルアクリレート）、反応性メタクリル系モノマー（例えば、ジシクロペンテニルオキシエチルメタクリレート）等をさらに含んでいてもよい。ゴム系粘着剤組成物は、好ましくは、シランカップリング剤をさらに含み得る。シランカップリング剤としては、例えばエポキシ基含有シランカップリング剤が挙げられる。また、ゴム系粘着剤組成物は、好ましくは、炭化水素成分（例えば、ヘプタン）を含まない。第１の粘着剤層の厚みは、例えば１０μｍ～５０μｍであり得る。 The first adhesive layer 120 is typically used to bond the cover glass and the optical film together. The first pressure-sensitive adhesive layer 120 may be composed of any suitable pressure-sensitive adhesive as long as the storage elastic modulus G 1 ′ at −40 ° C. falls within the desired range described below. The first pressure-sensitive adhesive layer 120 can be typically composed of a rubber-based pressure-sensitive adhesive (rubber-based pressure-sensitive adhesive composition). The rubber-based pressure-sensitive adhesive composition can typically include a butadiene polymer and / or a polyisoprene polymer (or a modified product thereof) and a photopolymerization initiator. The rubber-based pressure-sensitive adhesive composition includes polystyrene, polyurethane (for example, one using isophorone diisocyanate as a raw material), polyurethane acrylate, polyisoprene-based acrylate or an esterified product thereof, terpene-based hydrogenated resin, reactive acrylic-based monomer (for example, 2 -Hydroxybutyl methacrylate, 4-hydroxyethyl acrylate, 2-ethylhexyl acrylate, dodecyl acrylate, isobornyl acrylate), a reactive methacrylic monomer (eg, dicyclopentenyloxyethyl methacrylate) and the like may be further contained. The rubber-based pressure-sensitive adhesive composition may preferably further include a silane coupling agent. Examples of the silane coupling agent include epoxy group-containing silane coupling agents. Moreover, the rubber-based pressure-sensitive adhesive composition preferably does not contain a hydrocarbon component (for example, heptane). The thickness of the first pressure-sensitive adhesive layer can be, for example, 10 μm to 50 μm.
　第２の粘着剤層１４０は、代表的には、最終的に得られるカバーガラス付光学積層体を表示セルに貼り合わせるために用いられる。第２の粘着剤層１４０は、代表的にはアクリル系粘着剤（アクリル系粘着剤組成物）で構成され得る。アクリル系粘着剤組成物は、代表的には、（メタ）アクリル系ポリマーを主成分として含む。（メタ）アクリル系ポリマーは、粘着剤組成物の固形分中、例えば５０重量％以上、好ましくは７０重量％以上、より好ましくは９０重量％以上の割合で粘着剤組成物に含有され得る。（メタ）アクリル系ポリマーは、モノマー単位としてアルキル（メタ）アクリレートを主成分として含有する。なお、（メタ）アクリレートはアクリレートおよび／またはメタクリレートをいう。アルキル（メタ）アクリレートのアルキル基としては、例えば、１個～１８個の炭素原子を有する直鎖状または分岐鎖状のアルキル基が挙げられる。当該アルキル基の平均炭素数は、好ましくは３個～９個である。（メタ）アクリル系ポリマーを構成するモノマーとしては、アルキル（メタ）アクリレート以外に、カルボキシル基含有モノマー、ヒドロキシル基含有モノマー、アミド基含有モノマー、芳香環含有（メタ）アクリレート等が挙げられる。アクリル系粘着剤組成物は、好ましくは、シランカップリング剤および／または架橋剤を含有し得る。シランカップリング剤としては、例えばエポキシ基含有シランカップリング剤が挙げられる。架橋剤としては、例えば、イソシアネート系架橋剤、過酸化物系架橋剤が挙げられる。第２の粘着剤層の厚みは、例えば１０μｍ～５０μｍであり得る。第２の粘着剤層またはアクリル系粘着剤組成物の詳細は、例えば特開２０１６－１９０９９６号公報に記載されており、当該公報の記載は本明細書に参考として援用される。 The second adhesive layer 140 is typically used to bond the finally obtained optical laminate with a cover glass to a display cell. The second pressure-sensitive adhesive layer 140 may typically be composed of an acrylic pressure-sensitive adhesive (acrylic pressure-sensitive adhesive composition). The acrylic pressure-sensitive adhesive composition typically contains a (meth) acrylic polymer as a main component. The (meth) acrylic polymer may be contained in the pressure-sensitive adhesive composition in a proportion of, for example, 50% by weight or more, preferably 70% by weight or more, more preferably 90% by weight or more, in the solid content of the adhesive composition. The (meth) acrylic polymer contains an alkyl (meth) acrylate as a main component as a monomer unit. Note that (meth) acrylate refers to acrylate and / or methacrylate. Examples of the alkyl group of the alkyl (meth) acrylate include a linear or branched alkyl group having 1 to 18 carbon atoms. The average carbon number of the alkyl group is preferably 3 to 9. Examples of the monomer constituting the (meth) acrylic polymer include a carboxyl group-containing monomer, a hydroxyl group-containing monomer, an amide group-containing monomer, and an aromatic ring-containing (meth) acrylate, in addition to the alkyl (meth) acrylate. The acrylic pressure-sensitive adhesive composition may preferably contain a silane coupling agent and / or a crosslinking agent. Examples of the silane coupling agent include epoxy group-containing silane coupling agents. Examples of the cross-linking agent include isocyanate-based cross-linking agents and peroxide-based cross-linking agents. The thickness of the second pressure-sensitive adhesive layer can be, for example, 10 μm to 50 μm. Details of the second pressure-sensitive adhesive layer or the acrylic pressure-sensitive adhesive composition are described in, for example, JP-A-2016-190996, and the description of the publication is incorporated herein by reference.
　本発明の実施形態においては、第１の粘着剤層１２０の－４０℃における貯蔵弾性率Ｇ１’と第２の粘着剤層１４０の－４０℃における貯蔵弾性率Ｇ２’との比Ｇ１’／Ｇ２’は１以上であり、好ましくは３以上であり、より好ましくは２０以上である。比Ｇ１’／Ｇ２’が１以上であれば、カバーガラス付偏光板におけるクラック（実質的には、光学フィルムのクラック：特に、ヒートサイクル試験後のクラック）を良好に抑制することができる。一方、比Ｇ１’／Ｇ２’は、例えば３００以下であり得る。より詳細には以下のとおりである。第１の粘着剤層の貯蔵弾性率が低い（柔らかい）と、偏光子の収縮の動きを抑制することができず、第１の粘着剤層側の保護フィルム（偏光子の視認側の保護フィルム）にクラックが生じる場合がある（第１の粘着剤層の貯蔵弾性率については後述する）。本発明の実施形態によれば、第１の粘着剤層の貯蔵弾性率を高くする（硬くする、結果としてＧ１’／Ｇ２’＞１とする）ことにより、偏光子の寸法変化を抑制し、第１の粘着剤層側の保護フィルムにクラックが生じることを抑制できる。別の実施形態においては、比Ｇ１’／Ｇ２’は１～２程度であってもよい。第１の粘着剤層および第２の粘着剤層の貯蔵弾性率の差を小さくすることにより、偏光子の収縮に対して上下で同じ動きをして歪みの発生を抑制することができる。 In embodiments of the present invention, the ratio G 1 between the first storage modulus at -40 ℃ of the adhesive layer 120 G 1 'and the storage modulus G 2 at -40 ℃ second adhesive layer 140' “/ G 2 ” is 1 or more, preferably 3 or more, and more preferably 20 or more. When the ratio G 1 '/ G 2 ' is 1 or more, cracks in the polarizing plate with the cover glass (substantially, cracks in the optical film: especially cracks after the heat cycle test) can be suppressed well. . On the other hand, the ratio G 1 ′ / G 2 ′ can be, for example, 300 or less. The details are as follows. When the storage elastic modulus of the first adhesive layer is low (soft), the movement of contraction of the polarizer cannot be suppressed, and thus the protective film on the first adhesive layer side (the protective film on the visible side of the polarizer). ) May be cracked (the storage elastic modulus of the first pressure-sensitive adhesive layer will be described later). According to the embodiment of the present invention, by increasing the storage elastic modulus of the first pressure-sensitive adhesive layer (making it harder, as a result, G 1 ′ / G 2 ′> 1), the dimensional change of the polarizer is suppressed. However, it is possible to suppress the occurrence of cracks in the protective film on the first pressure-sensitive adhesive layer side. In another embodiment, the ratio G 1 ′ / G 2 ′ may be as high as 1-2. By reducing the difference between the storage elastic moduli of the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer, it is possible to suppress the occurrence of distortion by making the same movement up and down with respect to the contraction of the polarizer.
　第１の粘着剤層の－４０℃における貯蔵弾性率Ｇ１’は、好ましくは５．０×１０６（Ｐａ）以上であり、より好ましくは１．０×１０７（Ｐａ）以上であり、さらに好ましくは１．０×１０８（Ｐａ）以上であり、特に好ましくは１．５×１０８（Ｐａ）以上である。貯蔵弾性率Ｇ１’は、例えば５．０×１０９（Ｐａ）以下であり得る。貯蔵弾性率Ｇ１’がこのように大きく（第１の粘着剤層が硬く）、かつ、比Ｇ１’／Ｇ２’が上記のような関係を満足することにより、カバーガラス付偏光板におけるクラックをさらに良好に抑制することができる。 The storage modulus G 1 ′ of the first pressure-sensitive adhesive layer at −40 ° C. is preferably 5.0 × 10 6 (Pa) or more, more preferably 1.0 × 10 7 (Pa) or more, It is more preferably 1.0 × 10 8 (Pa) or more, and particularly preferably 1.5 × 10 8 (Pa) or more. The storage elastic modulus G 1 ′ can be, for example, 5.0 × 10 9 (Pa) or less. In the polarizing plate with a cover glass, the storage elastic modulus G 1 ′ is so large (the first pressure-sensitive adhesive layer is hard) and the ratio G 1 ′ / G 2 ′ satisfies the above relationship. Cracks can be suppressed even better.
　第２の粘着剤層の－４０℃における貯蔵弾性率Ｇ２’は、好ましくは１．０×１０５（Ｐａ）以上であり、より好ましくは１．０×１０７（Ｐａ）以上であり、さらに好ましくは１．０×１０８（Ｐａ）以上であり、特に好ましくは１．０×１０８（Ｐａ）以上である。貯蔵弾性率Ｇ２’は、例えば１．０×１０９（Ｐａ）以下であり得る。貯蔵弾性率Ｇ２’がこのような範囲であれば、比Ｇ１’／Ｇ２’を所望の値とすることが容易である。 The storage modulus G 2 ′ of the second pressure-sensitive adhesive layer at −40 ° C. is preferably 1.0 × 10 5 (Pa) or more, more preferably 1.0 × 10 7 (Pa) or more, It is more preferably 1.0 × 10 8 (Pa) or more, and particularly preferably 1.0 × 10 8 (Pa) or more. The storage elastic modulus G 2 ′ can be, for example, 1.0 × 10 9 (Pa) or less. When the storage elastic modulus G 2 ′ is in such a range, it is easy to set the ratio G 1 ′ / G 2 ′ to a desired value.
　カバーガラス１１０については業界で周知の構成が採用され得るので、詳細な説明は省略する。 Since the cover glass 110 may have a configuration well known in the industry, a detailed description thereof will be omitted.
Ｂ．カバーガラス付光学積層体の製造方法
　以下、一例として図２に示すような平面形状のカバーガラス付光学積層体の製造方法における各工程を説明する。図示例では、光学フィルムと第２の粘着剤層と（実用的にはセパレーターと）の積層体（以下、光学積層体と称する）を切削加工に供する実施形態について説明する。 B. Manufacturing Method of Optical Laminate with Cover Glass Hereinafter, each step in the manufacturing method of the optical laminate with a cover glass having a planar shape as shown in FIG. 2 will be described as an example. In the illustrated example, an embodiment in which a laminate of an optical film and a second pressure-sensitive adhesive layer (practically a separator) (hereinafter referred to as an optical laminate) is subjected to cutting processing will be described.
Ｂ－１．ワークの形成
　図３は、切削加工を説明するための概略斜視図であり、本図にワーク１が示されている。図３に示すように、光学積層体を複数枚重ねたワーク１が形成される。光学積層体は、ワーク形成に際し、代表的には任意の適切な形状に切断されている。具体的には、光学積層体は矩形形状に切断されていてもよく、矩形形状に類似する形状に切断されていてもよく、目的に応じた適切な形状（例えば、円形）に切断されていてもよい。図示例では、光学積層体は矩形形状に切断されており、ワーク１は、互いに対向する外周面（切削面）１ａ、１ｂおよびそれらと直交する外周面（切削面）１ｃ、１ｄを有している。ワーク１は、好ましくは、クランプ手段（図示せず）により上下からクランプされている。ワークの総厚みは、好ましくは８ｍｍ～２０ｍｍであり、より好ましくは９ｍｍ～１５ｍｍであり、さらに好ましくは約１０ｍｍである。このような厚みであれば、クランプ手段による押圧または切削加工時の衝撃による損傷を防止し得る。光学積層体は、ワークがこのような総厚みとなるように重ねられる。ワークを構成する光学積層体の枚数は、例えば１０枚～５０枚であり得る。クランプ手段（例えば、治具）は、軟質材料で構成されてもよく硬質材料で構成されてもよい。軟質材料で構成される場合、その硬度（ＪＩＳ  Ａ）は、好ましくは６０°～８０°である。硬度が高すぎると、クランプ手段による押し跡が残る場合がある。硬度が低すぎると、治具の変形により位置ずれが生じ、切削精度が不十分となる場合がある。 B-1. Formation of Workpiece FIG. 3 is a schematic perspective view for explaining the cutting process, and the workpiece 1 is shown in this figure. As shown in FIG. 3, a work 1 is formed by stacking a plurality of optical laminates. The optical laminate is typically cut into any appropriate shape when forming a work. Specifically, the optical layered product may be cut into a rectangular shape, may be cut into a shape similar to the rectangular shape, or may be cut into an appropriate shape (for example, a circle) according to the purpose. Good. In the illustrated example, the optical laminated body is cut into a rectangular shape, and the work 1 has outer peripheral surfaces (cutting surfaces) 1a and 1b facing each other and outer peripheral surfaces (cutting surfaces) 1c and 1d orthogonal to them. There is. The work 1 is preferably clamped from above and below by a clamp means (not shown). The total thickness of the work is preferably 8 mm to 20 mm, more preferably 9 mm to 15 mm, and further preferably about 10 mm. With such a thickness, it is possible to prevent damage due to the pressing by the clamp means or the impact during cutting. The optical laminates are stacked so that the works have such a total thickness. The number of optical laminates constituting the work may be, for example, 10 to 50. The clamp means (eg, jig) may be made of a soft material or a hard material. When it is made of a soft material, its hardness (JIS A) is preferably 60 ° to 80 °. If the hardness is too high, the pressing trace by the clamp means may remain. If the hardness is too low, the jig may be deformed to cause positional deviation, resulting in insufficient cutting accuracy.
Ｂ－２．切削加工
　次に、ワーク１の外周面を、切削手段２０により切削する。切削は、切削手段の切削刃をワーク１の外周面に当接させることにより行われる。切削は、ワークの外周面の全周にわたって行ってもよく、所定の位置のみに行ってもよい。図２に示すような平面形状の光学積層体を作製する場合、切削は、代表的にはワークの外周面の全周にわたって行われる。例えば、ワークの外周面の全周にわたって切削が行われた後、凹部を形成するための切削がさらに行われ得る。切削加工は、代表的には図３～図５に示すように、いわゆるエンドミル加工である。すなわち、切削手段（エンドミル）２０の側面を用いて、ワーク１の外周面を切削する。切削手段（エンドミル）２０としては、代表的にはストレートエンドミルが用いられ得る。 B-2. Cutting Next, the outer peripheral surface of the work 1 is cut by the cutting means 20. The cutting is performed by bringing the cutting blade of the cutting means into contact with the outer peripheral surface of the work 1. The cutting may be performed over the entire circumference of the outer peripheral surface of the work, or may be performed only at a predetermined position. When producing a planar optical laminate as shown in FIG. 2, cutting is typically performed over the entire circumference of the outer peripheral surface of the work. For example, after cutting the entire circumference of the outer peripheral surface of the work, the cutting for forming the concave portion may be further performed. Cutting is typically so-called end milling, as shown in FIGS. 3 to 5. That is, the outer peripheral surface of the work 1 is cut using the side surface of the cutting means (end mill) 20. A straight end mill can be typically used as the cutting means (end mill) 20.
　エンドミル２０は、図４および図５に示すように、ワーク１の積層方向（鉛直方向）に延びる回転軸２１と、回転軸２１を中心として回転する本体の最外径として構成される切削刃２２と、を有する。切削刃２２は、図４に示すように回転軸２１に沿ってねじれた最外径として構成されてもよく（所定のねじれ角を有していてもよく）、図５に示すように回転軸２１に実質的に平行な方向に延びるよう構成されていてもよい（ねじれ角が０°であってもよい）。なお、「０°」は実質的に０°であるという意味であり、加工誤差等によりわずかな角度ねじれている場合も包含する。切削刃が所定のねじれ角を有する場合、ねじれ角は好ましくは７０°以下であり、より好ましくは６５°以下であり、さらに好ましくは４５°以下である。切削刃２２は、刃先２２ａと、すくい面２２ｂと、逃がし面２２ｃと、を含む。切削刃２２の刃数は、後述の所望の接触回数が得られる限りにおいて適切に設定され得る。図４における刃数は３枚であり図５における刃数は２枚であるが、刃数は１枚であってもよく、４枚であってもよく、５枚以上であってもよい。好ましくは、刃数は２枚である。このような構成であれば、刃の剛性が確保され、かつ、ポケットが確保されて削りカスを良好に排出することができる。 As shown in FIGS. 4 and 5, the end mill 20 includes a rotary shaft 21 extending in the stacking direction (vertical direction) of the works 1, and a cutting blade 22 configured as an outermost diameter of a main body rotating about the rotary shaft 21. And. The cutting blade 22 may be configured as an outermost diameter twisted along the rotating shaft 21 as shown in FIG. 4 (may have a predetermined helix angle), and as shown in FIG. It may be configured to extend in a direction substantially parallel to 21 (the twist angle may be 0 °). It should be noted that “0 °” means substantially 0 °, and also includes a case where a slight angle twist is caused by a processing error or the like. When the cutting blade has a predetermined helix angle, the helix angle is preferably 70 ° or less, more preferably 65 ° or less, and further preferably 45 ° or less. The cutting blade 22 includes a cutting edge 22a, a rake surface 22b, and a relief surface 22c. The number of blades of the cutting blade 22 can be appropriately set as long as a desired number of contacts described later can be obtained. Although the number of blades in FIG. 4 is three and the number of blades in FIG. 5 is two, the number of blades may be one, four, or five or more. Preferably, the number of blades is two. With such a configuration, the rigidity of the blade is ensured and the pocket is secured, so that the scraps can be satisfactorily discharged.
　１つの実施形態においては、切削刃２２のＨＶ硬度は、代表的には１５００以上であり、好ましくは１７００以上であり、より好ましくは２０００以上である。ＨＶ硬度の上限は、例えば２３５０であり得る。この場合、切削刃は、代表的には超硬合金で構成される。超硬合金は、代表的には、金属炭化物の粉末を焼結して得られる。超硬合金の具体例としては、ＷＣ－Ｃｏ系合金、ＷＣ－ＴｉＣ－Ｃｏ系合金、ＷＣ－ＴａＣ－Ｃｏ系合金、ＷＣ－ＴｉＣ－ＴａＣ－Ｃｏ系合金が挙げられる。なお、ＨＶ硬度はビッカーズ硬さとも称され、ＪＩＳ　Ｚ　２２４４に準じて測定され得る。 In one embodiment, the HV hardness of the cutting blade 22 is typically 1500 or higher, preferably 1700 or higher, and more preferably 2000 or higher. The upper limit of HV hardness may be, for example, 2350. In this case, the cutting blade is typically made of cemented carbide. Cemented carbide is typically obtained by sintering metal carbide powder. Specific examples of the cemented carbide include WC-Co based alloys, WC-TiC-Co based alloys, WC-TaC-Co based alloys and WC-TiC-TaC-Co based alloys. The HV hardness is also called Vickers hardness and can be measured according to JIS Z 2244.
　別の実施形態においては、切削刃２２のＨＶ硬度は、代表的には７０００以上であり、好ましくは８０００以上であり、より好ましくは９０００以上であり、さらに好ましくは１００００以上である。ＨＶ硬度の上限は、例えば１５０００であり得る。この場合、切削刃は、代表的には焼結ダイヤモンドを含む。より詳細には、切削刃は、超硬合金で構成された基部に焼結ダイヤモンド層が形成されている。焼結ダイヤモンド（ＰＣＤ：Ｐｏｌｙｃｒｙｓｔａｌｌｉｎｅ　ｄｉａｍｏｎｄ）は、ダイヤモンドの小さな粒を金属および／またはセラミックスの粉と一緒に高温・高圧で焼き固めた多結晶ダイヤモンドをいう。 In another embodiment, the HV hardness of the cutting blade 22 is typically 7,000 or more, preferably 8,000 or more, more preferably 9000 or more, and further preferably 10,000 or more. The upper limit of HV hardness may be, for example, 15,000. In this case, the cutting blade typically comprises sintered diamond. More specifically, the cutting blade has a sintered diamond layer formed on a base portion made of cemented carbide. Sintered diamond (PCD) is a polycrystalline diamond in which small diamond particles are hardened at high temperature and high pressure together with metal and / or ceramic powder.
　切削加工の条件は、目的に応じて適切に設定され得る。例えば、エンドミルの送り速度、回転数、刃数等を適切に調整することにより、粘着剤層を含む光学積層体であっても良好に切削することができる。本明細書において「送り速度」は、切削手段（エンドミル）とワークとの相対速度を意味する。したがって、切削加工においては、エンドミルのみを移動させてもよく、ワークのみを移動させてもよく、エンドミルおよびワークの両方を移動させてもよい。切削回数は、１回削り、２回削り、３回削りまたはそれ以上であり得る。１つの実施形態においては、エンドミル２０の直径は、好ましくは３ｍｍ～２０ｍｍである。 The cutting conditions can be set appropriately according to the purpose. For example, by appropriately adjusting the feed speed, the number of rotations, the number of blades, etc. of the end mill, it is possible to satisfactorily cut even an optical laminate including an adhesive layer. In the present specification, the "feed rate" means the relative speed between the cutting means (end mill) and the work. Therefore, in the cutting process, only the end mill may be moved, only the work may be moved, or both the end mill and the work may be moved. The number of cuts can be one cut, two cuts, three cuts or more. In one embodiment, the diameter of the end mill 20 is preferably 3 mm to 20 mm.
　以上のようにして、切削加工された光学積層体が得られ得る。なお、切削加工された光学積層体（実質的には、光学フィルムおよび粘着剤層）は、代表的には、切削痕を有し得る。 As described above, a cut optical laminate can be obtained. The cut optical laminate (substantially the optical film and the pressure-sensitive adhesive layer) may typically have cutting marks.
　得られた光学積層体を、第１の粘着剤層を介してカバーガラスに貼り合わせることにより、カバーガラス付光学積層体が得られ得る。 An optical laminated body with a cover glass can be obtained by bonding the obtained optical laminated body to a cover glass via the first adhesive layer.
　図示例では光学積層体を切削加工に供する実施形態について説明したが、カバーガラス付光学積層体を切削加工に供してもよいことは言うまでもない。 In the illustrated example, the embodiment in which the optical laminated body is subjected to cutting processing has been described, but it goes without saying that the optical laminated body with the cover glass may be subjected to cutting processing.
Ｃ．カバーガラス付画像表示装置
　本発明の実施形態によるカバーガラス付光学積層体（例えば、上記Ａ項～Ｂ項に記載のカバーガラス付光学積層体）は、上記のとおり、カバーガラス付画像表示装置に好適に適用され得る。したがって、カバーガラス付画像表示装置もまた、本発明の実施形態に包含される。カバーガラス付画像表示装置は、表示セルと、表示セルの視認側に配置された本発明の実施形態によるカバーガラス付光学積層体と、を有する。 C. Image Display with Cover Glass The optical laminate with a cover glass according to the embodiment of the present invention (for example, the optical laminate with a cover glass according to the above items A to B) is used as an image display with a cover glass as described above. It can be suitably applied. Therefore, an image display device with a cover glass is also included in the embodiments of the present invention. The image display device with a cover glass includes a display cell and an optical laminate with a cover glass according to the embodiment of the present invention, which is arranged on the viewing side of the display cell.
　画像表示装置としては、例えば、液晶表示装置、有機エレクトロルミネセンス（ＥＬ）表示装置、量子ドット表示装置が挙げられる。 Examples of the image display device include a liquid crystal display device, an organic electroluminescence (EL) display device, and a quantum dot display device.
　以下、実施例により本発明を具体的に説明するが、本発明はこれらの実施例には限定されない。実施例における評価項目は以下のとおりである。 Hereinafter, the present invention will be specifically described by way of examples, but the present invention is not limited to these examples. The evaluation items in the examples are as follows.
（１）クラック
　実施例および比較例で得られたカバーガラス付偏光板について、－４０℃～８５℃で２００サイクルのヒートサイクル（ヒートショック）試験を行った。試験後のクラックの発生状況について、偏光フィルターを上記偏光板の偏光子の吸収軸とクロスニコルになるように配置した状態で透過光検査を行い、以下の基準で評価した。
　　　　あり：光漏れを視認できる
　　　　なし：光漏れを視認できない
　上記評価を、実施例および比較例で得られたカバーガラス付偏光板毎に３試料ずつ行った。３試料のうちクラックが発生した試料の数を、クラックの発生頻度（Ｆ／３ｐｃｓ）とした。さらに、光学顕微鏡を用いて、倍率５０倍の透過観察でクラックの大きさを測定し、一番大きなクラックの大きさを、クラックサイズ（μｍ）とした。 (1) Cracks The polarizing plate with a cover glass obtained in Examples and Comparative Examples was subjected to a 200-cycle heat cycle (heat shock) test at −40 ° C. to 85 ° C. Regarding the state of generation of cracks after the test, a transmitted light inspection was carried out in a state where the polarizing filter was arranged so as to be in a crossed Nicols with the absorption axis of the polarizer of the above-mentioned polarizing plate, and the following criteria were evaluated.
Yes: Light leakage can be visually observed No: Light leakage cannot be visually observed The above evaluation was carried out for three samples for each polarizing plate with a cover glass obtained in Examples and Comparative Examples. The number of cracks in the three samples was defined as the crack occurrence frequency (F / 3 pcs). Furthermore, the size of the crack was measured by transmission observation at a magnification of 50 times using an optical microscope, and the size of the largest crack was defined as the crack size (μm).
＜実施例１＞
　常法により、視認側から順に表面保護フィルム（４８μｍ）／ハードコート層（５μｍ）／シクロオレフィン系保護フィルム（４７μｍ）／偏光子（５μｍ）／シクロオレフィン系保護フィルム（２４μｍ）／第２の粘着剤層（２０μｍ）／セパレーターの構成を有する粘着剤層付偏光板を作製した。第２の粘着剤層は、特開２０１６－１９０９９６号公報の［０１２１］および［０１２４］に準じて作製した。第２の粘着剤層の－４０℃における貯蔵弾性率Ｇ２’は５．０×１０６（Ｐａ）であった。得られた粘着剤層付偏光板を図２に類似した形状（概略サイズ１４２．０ｍｍ×６６．８ｍｍの矩形形状、凹部を有さない形状）に打ち抜き、打ち抜いた粘着剤層付偏光板を複数枚重ねてワーク（総厚み約１０ｍｍ）とした。得られたワークをクランプ（治具）で挟んだ状態で、エンドミル加工により周縁部を切削するとともに凹部を形成し、図２に示すような切削加工された粘着剤層付偏光板を得た。エンドミルの切削刃は焼結ダイヤモンドを用いたものであり、ＨＶ硬度は１００００であった。また、エンドミルの刃数は２枚、ねじれ角は０°であった。また、エンドミルの送り速度（直線部を切削する際の送り速度）は１０００ｍｍ／分であり、回転数は２５０００ｒｐｍであり、切削回数は２回（１回目０．１ｍｍ、２回目０．２ｍｍの切削しろ０．３ｍｍ）であった。 <Example 1>
By a conventional method, the surface protective film (48 μm) / hard coat layer (5 μm) / cycloolefin-based protective film (47 μm) / polarizer (5 μm) / cycloolefin-based protective film (24 μm) / second adhesive, in order from the viewer side. A pressure-sensitive adhesive layer-attached polarizing plate having a composition of an agent layer (20 μm) / separator was produced. The second pressure-sensitive adhesive layer was produced according to [0121] and [0124] of JP-A-2016-190996. The storage elastic modulus G 2 ′ of the second pressure-sensitive adhesive layer at −40 ° C. was 5.0 × 10 6 (Pa). The obtained polarizing plate with an adhesive layer was punched into a shape similar to that shown in FIG. 2 (a rectangular shape having an approximate size of 142.0 mm × 66.8 mm, a shape having no recess), and a plurality of the polarizing plates with an adhesive layer were punched out. The sheets were stacked to form a work (total thickness of about 10 mm). With the obtained work sandwiched by clamps (jigs), the peripheral portion was cut by end milling and recesses were formed, and a polarizing plate with a pressure-sensitive adhesive layer was obtained as shown in FIG. The cutting blade of the end mill was made of sintered diamond and had an HV hardness of 10,000. The number of blades of the end mill was 2, and the twist angle was 0 °. Further, the feed rate of the end mill (the feed rate when cutting a straight line portion) is 1000 mm / min, the rotation speed is 25000 rpm, and the number of times of cutting is 2 times (first cutting of 0.1 mm, second cutting of 0.2 mm). The margin was 0.3 mm).
　上記の粘着剤層付偏光板の表面保護フィルムを剥離し、剥離面に第１の粘着剤層を形成した。第１の粘着剤層は、特開２０１６－１０３０３０号公報の［００５３］に準じて作製した。第１の粘着剤層の－４０℃における貯蔵弾性率Ｇ１’は１．７×１０８（Ｐａ）であった。形成された第１の粘着剤層を介して、粘着剤層付偏光板を松浪硝子工業製カバーガラスに貼り合わせ、カバーガラス付偏光板（カバーガラス付光学積層体）を得た。さらに、第２の粘着剤層に仮着されていたセパレーターを剥離し、第２の粘着剤層にガラス板を貼り合わせ、上記のクラックの評価に供した。結果を表１に示す。 The surface protective film of the polarizing plate with the pressure-sensitive adhesive layer was peeled off, and the first pressure-sensitive adhesive layer was formed on the peeled surface. The first pressure-sensitive adhesive layer was produced according to [0053] in JP-A-2016-103030. The storage elastic modulus G 1 ′ of the first pressure-sensitive adhesive layer at −40 ° C. was 1.7 × 10 8 (Pa). The polarizing plate with an adhesive layer was attached to a cover glass manufactured by Matsunami Glass Industry through the formed first adhesive layer to obtain a polarizing plate with a cover glass (optical laminate with a cover glass). Further, the separator temporarily attached to the second pressure-sensitive adhesive layer was peeled off, a glass plate was attached to the second pressure-sensitive adhesive layer, and the cracks were evaluated. The results are shown in Table 1.
＜実施例２～８および比較例１～５＞
　第１の粘着剤層を構成する粘着剤組成物の処方を変更して－４０℃における貯蔵弾性率Ｇ１’を表１に示すようにしたこと、第２の粘着剤層を構成する粘着剤組成物の処方を変更して－４０℃における貯蔵弾性率Ｇ２’を表１に示すようにしたこと、ならびに実施例７～８および比較例２～５についてはエンドミルの切削刃のねじれ角を３０°としたこと以外は実施例１と同様にして、図２に示すような切削加工されたカバーガラス付偏光板を得た。得られた切削加工されたカバーガラス付偏光板について、実施例１と同様にしてクラックの評価を行った。結果を表１に示す。なお、各実施例および比較例における第１の粘着剤層は下記公報の記載に準じて作製した。
　　　実施例２：特開２０１１－１７５２４７号公報の［０１００］および［０１１０］
　　　実施例３：特開２０１７－０７５９９８号公報の［００８５］の（Ｅ）
　　　実施例４：特開２０１４－１５６５５２号公報の［０１０３］
　　　実施例５：特開２０１６－１９０９９６号公報の［０１２１］および［０１２４］
　　　実施例６：特開２０１６－０６６０７４号公報の［００６５］
　　　実施例７：実施例１と同じ
　　　実施例８：実施例５と同じ
　　　比較例１：特開２０１２－０４６６５８号公報の［００４８］の表１（実施例１）
　　　比較例２：特許第５０３８２２４号の［０１４９］、［０１５０］および［０１５３］（実施例１）
　　　比較例３：実施例１と同じ
　　　比較例４：比較例１と同じ
　　　比較例５：比較例１と同じ
　各実施例および比較例における第２の粘着剤層は下記公報の記載に準じて作製した。
　　　実施例２：実施例１と同じ
　　　実施例３：実施例１と同じ
　　　実施例４：実施例１と同じ
　　　実施例５：実施例１と同じ
　　　実施例６：実施例１と同じ
　　　実施例７：実施例１と同じ
　　　実施例８：特許第５０３８２２４号の［０１４９］、［０１５０］および［０１５３］（実施例１）
　　　比較例１：実施例１と同じ
　　　比較例２：実施例１と同じ
　　　比較例３：特許第４８２０４４３号の［０１３５］および［０１３６］（実施例１）
　　　比較例４：実施例８と同じ
　　　比較例５：実施例１と同じ <Examples 2 to 8 and Comparative Examples 1 to 5>
The formulation of the pressure-sensitive adhesive composition constituting the first pressure-sensitive adhesive layer was changed so that the storage elastic modulus G 1 ′ at −40 ° C. was as shown in Table 1, and the pressure-sensitive adhesive constituting the second pressure-sensitive adhesive layer. The formulation of the composition was changed so that the storage modulus G 2 'at -40 ° C was as shown in Table 1, and for Examples 7 to 8 and Comparative Examples 2 to 5, the helix angle of the cutting edge of the end mill was changed. A polarizing plate with a cover glass which was cut as shown in FIG. 2 was obtained in the same manner as in Example 1 except that the angle was 30 °. The cracks were evaluated in the same manner as in Example 1 with respect to the obtained polarizing plate with a cover glass which was cut. The results are shown in Table 1. The first pressure-sensitive adhesive layer in each example and comparative example was produced according to the description in the following publication.
Example 2: [0100] and [0110] of JP2011-175247A
Example 3: (E) of [0085] of JP-A-2017-075998
Example 4: [0103] of JP-A-2014-156552
Example 5: [0121] and [0124] of JP-A-2016-190996.
Example 6: [0065] of JP-A-2016-060674.
Example 7: Same as Example 1 Example 8: Same as Example 5 Comparative Example 1: Table 1 (Example 1) of [0048] in JP 2012-046658 A.
Comparative Example 2: [0149], [0150] and [0153] of Japanese Patent No. 5038224 (Example 1).
Comparative Example 3: Same as Example 1 Comparative Example 4: Same as Comparative Example 1 Comparative Example 5: Same as Comparative Example 1 The second pressure-sensitive adhesive layer in each Example and Comparative Example was prepared according to the description in the following publication. .
Example 2: Same as Example 1 Example 3: Same as Example 1 Example 4: Same as Example 1 Example 5: Same as Example 1 Example 6: Same as Example 1 Example 7: Example Same as Example 1 Example 8: [0149], [0150] and [0153] of Patent No. 5038224 (Example 1)
Comparative Example 1: Same as Example 1 Comparative Example 2: Same as Example 1 Comparative Example 3: [0135] and [0136] of Patent No. 4820443 (Example 1).
Comparative Example 4: Same as Example 8 Comparative Example 5: Same as Example 1.
Figure JPOXMLDOC01-appb-T000001
  
Figure JPOXMLDOC01-appb-T000001
  
　本発明のカバーガラス付光学積層体は、画像表示部にカバーガラスを設ける場合に好適に用いられ、特に、パーソナルコンピューター（ＰＣ）やタブレット端末に代表される矩形の画像表示部、および／または、自動車のインストゥルメントパネルやスマートウォッチに代表される異形の画像表示部に好適に用いられ得る。 The optical laminated body with a cover glass of the present invention is preferably used when a cover glass is provided on the image display section, and in particular, a rectangular image display section represented by a personal computer (PC) or a tablet terminal, and / or It can be suitably used for an odd-shaped image display section represented by an automobile instrument panel or a smart watch.
　　１　　　ワーク
　２０　　　切削手段
１００　　　カバーガラス付光学積層体
１１０　　　カバーガラス
１２０　　　第１の粘着剤層
１３０　　　光学フィルム
１４０　　　第２の粘着剤層
１５０　　　セパレーター
１６０　　　凹部 1 Work 20 Cutting Means 100 Optical Laminate with Cover Glass 110 Cover Glass 120 First Adhesive Layer 130 Optical Film 140 Second Adhesive Layer 150 Separator 160 Recess

Claims (9)

  1. 　カバーガラスと第１の粘着剤層と光学フィルムと第２の粘着剤層とをこの順に有し、
    　該第１の粘着剤層の－４０℃における貯蔵弾性率Ｇ１’と該第２の粘着剤層の－４０℃における貯蔵弾性率Ｇ２’との比Ｇ１’／Ｇ２’が１以上である、
    　カバーガラス付光学積層体。     A cover glass, a first pressure-sensitive adhesive layer, an optical film, and a second pressure-sensitive adhesive layer in this order,
    The ratio G 1 ′ / G 2 ′ of the storage elastic modulus G 1 ′ at −40 ° C. of the first adhesive layer and the storage elastic modulus G 2 ′ at −40 ° C. of the second adhesive layer is 1 or more. Is,
    Optical laminated body with cover glass.
  2. 　前記第１の粘着剤層の－４０℃における貯蔵弾性率Ｇ１’が５．０×１０６（Ｐａ）以上である、請求項１に記載のカバーガラス付光学積層体。 The optical laminated body with a cover glass according to claim 1, wherein a storage elastic modulus G 1 ′ of the first pressure-sensitive adhesive layer at −40 ° C. is 5.0 × 10 6 (Pa) or more.
  3. 　少なくとも前記光学フィルムおよび前記第２の粘着剤層が切削痕を有する切削端面を含む、請求項１または２に記載のカバーガラス付光学積層体。 The optical laminated body with a cover glass according to claim 1 or 2, wherein at least the optical film and the second pressure-sensitive adhesive layer include a cutting end surface having a cutting mark.
  4. 　前記切削加工された部分が、平面視した場合に凹部を含む、請求項３に記載のカバーガラス付光学積層体。 The optical laminated body with a cover glass according to claim 3, wherein the machined portion includes a concave portion when seen in a plan view.
  5. 　前記光学フィルムが偏光子を含む、請求項１から４のいずれかに記載のカバーガラス付光学積層体。 The optical laminated body with a cover glass according to any one of claims 1 to 4, wherein the optical film contains a polarizer.
  6. 　前記光学フィルムが、前記偏光子の前記第１の粘着剤層側に保護フィルムをさらに有する、請求項５に記載のカバーガラス付光学積層体。 The optical laminated body with a cover glass according to claim 5, wherein the optical film further has a protective film on the first adhesive layer side of the polarizer.
  7. 　前記保護フィルムにハードコート層が形成されている、請求項６に記載のカバーガラス付光学積層体。 The optical laminated body with a cover glass according to claim 6, wherein a hard coat layer is formed on the protective film.
  8. 　前記保護フィルムの２５℃における破断伸びが２ｍｍ以上である、請求項６または７に記載のカバーガラス付光学積層体。 The optical laminate with a cover glass according to claim 6 or 7, wherein the protective film has a breaking elongation at 25 ° C of 2 mm or more.
  9. 　表示セルと、該表示セルの視認側に配置された請求項１から８のいずれかに記載のカバーガラス付光学積層体と、を有する、カバーガラス付画像表示装置。
          An image display device with a cover glass, comprising: a display cell; and the optical laminated body with a cover glass according to any one of claims 1 to 8, which is arranged on a viewing side of the display cell.
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