WO2020079875A1 - Stratifié optique doté d'un verre de protection et dispositif d'affichage d'images doté d'un verre de protection - Google Patents

Stratifié optique doté d'un verre de protection et dispositif d'affichage d'images doté d'un verre de protection 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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WIPO (PCT)
Prior art keywords
cover glass
adhesive layer
optical
sensitive adhesive
pressure
Prior art date
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PCT/JP2019/019570
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English (en)
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/ja
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/ko
Priority to CN201980067678.2A priority patent/CN112868057B/zh
Publication of WO2020079875A1 publication Critical patent/WO2020079875A1/fr

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Classifications

    • 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.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Nonlinear Science (AREA)
  • Optics & Photonics (AREA)
  • Mathematical Physics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Theoretical Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Laminated Bodies (AREA)
  • Adhesives Or Adhesive Processes (AREA)

Abstract

La présente invention concerne un stratifié optique doté d'un verre de protection qui est moins susceptible de se fissurer ; et un dispositif d'affichage d'images doté d'un verre de protection et qui comprend ledit stratifié optique doté d'un verre de protection. Ce stratifié optique doté d'un verre de protection a un verre de protection, une première couche adhésive, un film optique et une seconde couche adhésive dans cet ordre, le rapport G1'/G2' d'un module d'élasticité de stockage G1' de la première couche adhésive à -40 °C par comparaison à un module d'élasticité de stockage G2' de la seconde couche adhésive à -40 °C étant de 1 ou plus. Ce dispositif d'affichage d'images doté d'un verre de protection comporte : une cellule d'affichage ; et un stratifié optique de la présente invention, le stratifié optique étant doté d'un verre de protection et disposé sur un côté visible de la cellule d'affichage.
PCT/JP2019/019570 2018-10-18 2019-05-16 Stratifié optique doté d'un verre de protection et dispositif d'affichage d'images doté d'un verre de protection WO2020079875A1 (fr)

Priority Applications (2)

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KR1020217008694A KR102390821B1 (ko) 2018-10-18 2019-05-16 커버 유리 부착 광학 적층체 및 커버 유리 부착 화상 표시 장치
CN201980067678.2A CN112868057B (zh) 2018-10-18 2019-05-16 带保护玻璃的光学层叠体及带保护玻璃的图像显示装置

Applications Claiming Priority (4)

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JP2018196342 2018-10-18
JP2018-196342 2018-10-18
JP2019084162A JP6795651B2 (ja) 2018-10-18 2019-04-25 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
JP2019-084162 2019-04-25

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WO2020079875A1 true WO2020079875A1 (fr) 2020-04-23

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WO2017175674A1 (fr) * 2016-04-07 2017-10-12 大日本印刷株式会社 Film protecteur, film optique, stratifié, plaque polarisante, dispositif d'affichage d'image, et procédé de production de ladite plaque polarisante
WO2018030207A1 (fr) * 2016-08-08 2018-02-15 シャープ株式会社 Dispositif d'affichage
WO2018181014A1 (fr) * 2017-03-29 2018-10-04 日東電工株式会社 Film polarisant protege par un seul côté avec couche adhésive sensible à la pression, dispositif d'affichage d'image et procédé de production continu à cet effet

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JP6452483B2 (ja) * 2015-02-16 2019-01-16 日東電工株式会社 粘着剤付き光学フィルムおよび画像表示装置
JP6899721B2 (ja) 2016-07-22 2021-07-07 日東電工株式会社 偏光板の製造方法およびその製造装置
JP7042020B2 (ja) * 2016-08-15 2022-03-25 日東電工株式会社 フレキシブル画像表示装置用積層体、及び、フレキシブル画像表示装置
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009057394A (ja) * 2006-08-30 2009-03-19 Dic Corp 再剥離用粘着シート
JP2013087225A (ja) * 2011-10-19 2013-05-13 Oji Holdings Corp 光学フィルム用粘着剤、光学フィルム用粘着シート、光学フィルムの粘着方法、粘着剤層つき光学フィルムおよび表示装置
JP2013146806A (ja) * 2012-01-18 2013-08-01 Mitsubishi Rayon Co Ltd 導光板の製造方法
JP2015003516A (ja) * 2013-05-24 2015-01-08 デクセリアルズ株式会社 保護コート層付フィルム
US20160111040A1 (en) * 2014-10-16 2016-04-21 Lg Display Co., Ltd. Panel array for display device with narrow bezel
JP2017024177A (ja) * 2015-07-15 2017-02-02 日東電工株式会社 光学積層体
JP2017109911A (ja) * 2015-12-18 2017-06-22 旭硝子株式会社 車載表示装置用カバーガラス
WO2017175674A1 (fr) * 2016-04-07 2017-10-12 大日本印刷株式会社 Film protecteur, film optique, stratifié, plaque polarisante, dispositif d'affichage d'image, et procédé de production de ladite plaque polarisante
WO2018030207A1 (fr) * 2016-08-08 2018-02-15 シャープ株式会社 Dispositif d'affichage
WO2018181014A1 (fr) * 2017-03-29 2018-10-04 日東電工株式会社 Film polarisant protege par un seul côté avec couche adhésive sensible à la pression, dispositif d'affichage d'image et procédé de production continu à cet effet

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CN112868057B (zh) 2022-05-10
KR20210038693A (ko) 2021-04-07
KR102390821B1 (ko) 2022-04-27

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