WO2021060107A1 - 光学フィルム - Google Patents

光学フィルム Download PDF

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Publication number
WO2021060107A1
WO2021060107A1 PCT/JP2020/035082 JP2020035082W WO2021060107A1 WO 2021060107 A1 WO2021060107 A1 WO 2021060107A1 JP 2020035082 W JP2020035082 W JP 2020035082W WO 2021060107 A1 WO2021060107 A1 WO 2021060107A1
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WO
WIPO (PCT)
Prior art keywords
adhesive layer
polarizing plate
film
optical film
thickness
Prior art date
Application number
PCT/JP2020/035082
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English (en)
French (fr)
Japanese (ja)
Inventor
毅 村重
俊樹 大峰
Original Assignee
日東電工株式会社
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Application filed by 日東電工株式会社 filed Critical 日東電工株式会社
Priority to CN202080066844.XA priority Critical patent/CN114514452A/zh
Priority to KR1020227009216A priority patent/KR20220074866A/ko
Publication of WO2021060107A1 publication Critical patent/WO2021060107A1/ja

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
    • G02B5/3041—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/023—Optical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • 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
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3083—Birefringent or phase retarding elements

Definitions

  • the present invention relates to an optical film.
  • liquid crystal display elements and display elements using organic EL have been made lighter and thinner from the viewpoint of storage and design.
  • a cover glass has been used as the outermost surface of a display element, and after the polarizing plate is attached to a liquid crystal cell or the like, the cover glass is provided on the polarizing plate via an interlayer filler.
  • Patent Document 1 discloses that a glass film laminate having excellent strength and flexibility against contact with a protrusion having high hardness such as a pen is used for the outermost layer of a display element or a lighting element.
  • a glass film laminate used for a display element an optical film in which a glass film, an adhesive layer, a protective film, a polarizer, and an adhesive layer are laminated in this order has been proposed.
  • the present inventors make a glass film laminate into a predetermined size by processing such as laser or cutting according to the application such as a notebook computer, attach it to a display element, and perform a durability test in a humid environment or the like. went. As a result, it was found that cracks were generated at the edges of the glass film when processed to a predetermined size, and the cracks were elongated in a humidified environment or the like.
  • the present invention has been made in view of the above points, and provides an optical film capable of suppressing the elongation of cracks in a predetermined temperature and humidity environment even if cracks of a predetermined size are present at the edges of the glass film.
  • the purpose is to do.
  • the present optical film includes a glass film and a polarizing plate, the thickness of the glass film is 50 ⁇ m or more and 150 ⁇ m or less, the edge of the glass film has cracks of 20 ⁇ m or more in length, and the polarized light is used.
  • the plate has a polarizing element and a protective film arranged on at least one surface of the polarizing element, and the polarizing plate has a strain amount in the MD direction in a constant temperature and humidity environment at a temperature of 60 ° C. and a humidity of 90%.
  • the absolute value of the difference between the amount of strain in the TD direction and the amount of strain in the TD direction is 0 or more and 40 ⁇ 10-6 or less.
  • an optical film capable of suppressing the elongation of cracks in a predetermined temperature and humidity environment even if cracks of a predetermined size are present at the edges of the glass film.
  • FIG. 1 is a cross-sectional view illustrating the optical film according to the first embodiment.
  • the optical film 10 includes a glass film 11, an adhesive layer 12, a polarizing plate 13, and an adhesive layer 14 in this order.
  • the pressure-sensitive adhesive layer means a layer that has adhesiveness at room temperature and adheres to an adherend with a light pressure. Therefore, even when the adherend attached to the pressure-sensitive adhesive layer is peeled off, the pressure-sensitive adhesive layer retains a practical adhesive force.
  • the adhesive layer is a layer capable of binding substances by interposing between the substances. Therefore, when the adherend attached to the adhesive layer is peeled off, the adhesive layer does not have a practical adhesive force.
  • the polarizing plate 13 has a polarizer 131 and a protective film 132.
  • the protective film 132 is arranged on at least one side (one side) of the polarizer 131.
  • the protective film 132 is preferably arranged at least on the adhesive layer 12 side of the polarizer 131, but may be arranged on both sides (one surface and the other surface) of the polarizer 131, if necessary.
  • a retardation layer may be arranged on the side of the polarizing plate 13 opposite to the adhesive layer 12.
  • the retardation layer can be laminated on the polarizing plate 13 via any suitable adhesive layer or adhesive layer.
  • a release film may be arranged on the side opposite to the polarizing plate 13 via the pressure-sensitive adhesive layer 14.
  • the glass film 11 is not particularly limited, and an appropriate glass film 11 can be adopted depending on the intended purpose.
  • the glass film 11 includes, for example, soda-lime glass, borosilicate glass, aluminosilicate glass, quartz glass and the like.
  • non-alkali glass and low-alkali glass can be mentioned.
  • the content of the alkali metal component (for example, Na 2 O, K 2 O, Li 2 O) of the glass is preferably 15% by weight or less, and more preferably 10% by weight or less.
  • the thickness of the glass film 11 is preferably 50 ⁇ m to 150 ⁇ m, more preferably 60 ⁇ m to 140 ⁇ m, further preferably 70 ⁇ m to 130 ⁇ m, and particularly preferably 80 ⁇ m to 120 ⁇ m. Within such a range, it is possible to obtain an optical film 10 which is excellent in flexibility, can be processed by a roll-to-roll process, and has excellent productivity because the glass film is not easily cracked.
  • the light transmittance of the glass film 11 at a wavelength of 550 nm is preferably 85% or more.
  • the refractive index of the glass film 11 at a wavelength of 550 nm is preferably 1.4 to 1.65.
  • the density of the glass film 11 is preferably 2.3 g / cm 3 to 3.0 g / cm 3 , and more preferably 2.3 g / cm 3 to 2.7 g / cm 3 . If it is a glass film in the above range, it is possible to provide an optical film 10 that can contribute to weight reduction of an image display device or the like.
  • the molding method of the glass film 11 is not particularly limited, and an appropriate one can be adopted according to the purpose.
  • the glass film 11 is a mixture containing a main raw material such as silica and alumina, a defoaming agent such as sardine and antimony oxide, and a reducing agent such as carbon at a temperature of about 1400 ° C to 1600 ° C. It can be produced by melting, forming into a thin plate, and then cooling.
  • Examples of the molding method of the glass film 11 include a slot down draw method, a fusion method, and a float method.
  • the glass film formed into a plate shape by these methods may be chemically polished with a solvent such as hydrofluoric acid, if necessary, in order to thin the plate or improve the smoothness.
  • the adhesive layer 12 is not particularly limited, and an appropriate adhesive can be adopted depending on the purpose.
  • the adhesive include polyester adhesives, polyurethane adhesives, polyvinyl alcohol adhesives, and epoxy adhesives. Among these, an epoxy-based adhesive that can obtain particularly good adhesion is preferable.
  • the adhesive layer 12 When the adhesive layer 12 is a thermosetting adhesive, it can exhibit peeling resistance by heating and curing (solidifying). Further, when the adhesive layer 12 is a photocurable adhesive such as an ultraviolet curable type, the peeling resistance can be exhibited by irradiating the adhesive layer 12 with light such as ultraviolet rays and curing the adhesive. Further, when the adhesive layer 12 is a moisture-curable adhesive, it can be cured by reacting with moisture in the air or the like, so that it can be cured even if it is left to stand, and peeling resistance can be exhibited.
  • the adhesive layer 12 for example, a commercially available adhesive may be used, or various curable resins may be dissolved or dispersed in a solvent to prepare an adhesive solution (or dispersion).
  • the thickness of the adhesive layer 12 is preferably 10 ⁇ m or less, more preferably 0.1 ⁇ m to 10 ⁇ m, further preferably 0.5 ⁇ m to 8 ⁇ m, and particularly preferably 1 ⁇ m to 6 ⁇ m. Within such a range, an optical film 10 having excellent flexibility and puncture resistance can be obtained.
  • the elastic modulus of the adhesive layer 12 is preferably 0.5 GPa to 15 GPa, more preferably 0.8 GPa to 10 GPa, and further preferably 1 GPa to 5 GPa. Within such a range, an optical film 10 having excellent flexibility and puncture resistance can be obtained. In the present specification, the elastic modulus can be measured under the following conditions using an autograph.
  • the thickness of the polarizing plate 13 is preferably 5 ⁇ m to 300 ⁇ m, more preferably 10 ⁇ m to 250 ⁇ m, further preferably 25 ⁇ m to 200 ⁇ m, and particularly preferably 25 ⁇ m to 100 ⁇ m.
  • the elastic modulus of the polarizing plate 13 is preferably 1 GPa or more, more preferably 1 GPa to 10 GPa, further preferably 2 GPa to 7 GPa, and particularly preferably 2 GPa to 5 GPa. Within such a range, an optical film 10 having excellent puncture resistance can be obtained.
  • the shape of the polarizing plate 13 is not particularly limited, and an appropriate shape can be adopted depending on the purpose. As an example, a square shape having a long side and a short side can be mentioned.
  • the polarizing plate 13 has a rectangular shape, it is preferable that the absorption axis direction of the polarizer 131 of the polarizing plate 13 and the long side or the short side of the polarizing plate 13 are substantially parallel.
  • substantially parallel is a concept including not only the case where it is strictly parallel but also the case where the angle formed by both lines is ⁇ 10 ° (preferably ⁇ 5 °).
  • the thickness of the polarizer 131 is not particularly limited, and an appropriate thickness can be adopted depending on the intended purpose.
  • the thickness of the polarizer 131 is typically about 1 ⁇ m to 80 ⁇ m.
  • a thin polarizer may be used as the polarizer 131.
  • the thickness of the polarizer 131 is preferably 20 ⁇ m or less, more preferably 15 ⁇ m or less, still more preferably 10 ⁇ m or less, and particularly preferably 10 ⁇ m or less. It is 5 ⁇ m or less.
  • the polarizer 131 preferably exhibits absorption dichroism at any wavelength of 380 nm to 780 nm.
  • the simple substance transmittance of the polarizer is preferably 40.0% or more, more preferably 41.0% or more, still more preferably 42.0% or more, and particularly preferably 43.0% or more.
  • the degree of polarization of the polarizer 131 is preferably 99.8% or more, more preferably 99.9% or more, and further preferably 99.95% or more.
  • the polarizer 131 is preferably an iodine-based polarizer. More specifically, the polarizer can be composed of a polyvinyl alcohol-based resin (hereinafter, referred to as "PVA-based resin") film containing iodine.
  • PVA-based resin polyvinyl alcohol-based resin
  • the PVA-based resin that forms the PVA-based resin film is not particularly limited, and an appropriate resin can be used depending on the intended purpose. Examples thereof include polyvinyl alcohol and ethylene-vinyl alcohol copolymers.
  • Polyvinyl alcohol is obtained by saponifying polyvinyl acetate.
  • the ethylene-vinyl alcohol copolymer is obtained by saponifying the ethylene-vinyl acetate copolymer.
  • the degree of saponification of the PVA-based resin is usually 85 mol% to 100 mol%, preferably 95.0 mol% to 99.95 mol%, and more preferably 99.0 mol% to 99.93 mol%. Is.
  • the degree of saponification is determined according to JIS K 6726-1994. By using a PVA-based resin having such a degree of saponification, a polarizer having excellent durability can be obtained. If the degree of saponification is too high, gelation may occur.
  • the average degree of polymerization of the PVA-based resin is not particularly limited and can be appropriately selected according to the purpose.
  • the average degree of polymerization of the PVA-based resin is, for example, 1000 to 10000, preferably 1200 to 5000, and more preferably 1500 to 4500.
  • the average degree of polymerization is determined according to JIS K 6726-1994.
  • Examples of the method for producing the polarizer 131 include a method (I) of stretching and dyeing a single PVA-based resin film, and a method of stretching and dyeing a laminate (i) having a resin base material and a polyvinyl alcohol-based resin layer (i). II) and the like. Since the method (I) is a well-known and commonly used method in the art, detailed description thereof will be omitted.
  • a laminate (i) having a resin base material and a polyvinyl alcohol-based resin layer formed on one side of the resin base material is stretched and dyed, and polarized light is applied onto the resin base material.
  • the laminate (i) can be formed by applying and drying a coating liquid containing a polyvinyl alcohol-based resin on a resin base material. Further, the laminate (i) may be formed by transferring the polyvinyl alcohol-based resin layer onto the resin base material. Details of the production method (II) are described in, for example, Japanese Patent Application Laid-Open No. 2012-73580, and this publication can be incorporated herein by reference.
  • the protective film 132 is not particularly limited, and an appropriate resin film can be used depending on the intended purpose.
  • the material for forming the protective film 132 include polyester resins such as polyethylene terephthalate (PET), cellulose resins such as triacetyl cellulose (TAC), cycloolefin resins such as norbornene resins, and olefins such as polyethylene and polypropylene.
  • polyester resins such as polyethylene terephthalate (PET), cellulose resins such as triacetyl cellulose (TAC), cycloolefin resins such as norbornene resins, and olefins such as polyethylene and polypropylene.
  • polyester resins such as polyethylene terephthalate (PET)
  • TAC triacetyl cellulose
  • cycloolefin resins such as norbornene resins
  • olefins such as polyethylene and polypropylene.
  • the (meth) acrylic resin for example, a (meth) acrylic resin having a glutarimide structure is used.
  • examples of the (meth) acrylic resin having a glutarimide structure include JP-A-2006-309033, JP-A-2006-317560, JP-A-2006-328329, and JP-A. 2006-328334, 2006-337491, 2006-337492, 2006-337493, 2006-337569, 2007-009182, 2009- It is described in Japanese Patent Application Laid-Open No. 161744 and Japanese Patent Application Laid-Open No. 2010-284840. These statements may be incorporated herein by reference.
  • the protective film 132 and the polarizer 131 can be laminated via any suitable adhesive layer.
  • the resin base material used in the production of the polarizer 131 is peeled off before or after the protective film 132 and the polarizer 131 are laminated.
  • the thickness of the protective film 132 is preferably 4 ⁇ m to 250 ⁇ m, more preferably 5 ⁇ m to 150 ⁇ m, further preferably 10 ⁇ m to 100 ⁇ m, and particularly preferably 10 ⁇ m to 50 ⁇ m.
  • the elastic modulus of the protective film 132 is 1 GPa or more, preferably 1 GPa to 10 GPa, more preferably 1.8 GPa to 7 GPa, and further preferably 2 GPa to 5 GPa. Within such a range, an optical film 10 having excellent puncture resistance can be obtained.
  • the retardation layer is not an indispensable configuration, but is provided as needed.
  • the retardation layer is not particularly limited and may have any appropriate optical property and / or mechanical property depending on the purpose.
  • the retardation layer typically has a slow axis.
  • the optical and / or mechanical properties of the retardation layer can be appropriately selected depending on the orientation mode of the liquid crystal cell.
  • the retardation layer may exhibit a reverse dispersion wavelength characteristic in which the retardation value increases according to the wavelength of the measurement light, or may exhibit a positive wavelength dispersion characteristic in which the retardation value decreases according to the wavelength of the measurement light. It is also possible to exhibit a flat wavelength dispersion characteristic in which the phase difference value hardly changes depending on the wavelength of the measurement light.
  • the thickness of the retardation layer is preferably 60 ⁇ m or less, more preferably 30 ⁇ m to 55 ⁇ m, and further preferably 30 ⁇ m or less.
  • the retardation layer can be made of any suitable resin film that can satisfy the above characteristics.
  • suitable resins are cyclic olefin resins, polycarbonate resins, cellulose resins, polyester resins, polyvinyl alcohol resins, polyamide resins, polyimide resins, polyether resins, polystyrene resins, and acrylics. Examples thereof include based resins and polymer liquid crystal resins.
  • the pressure-sensitive adhesive layer 14 can be formed from any suitable pressure-sensitive adhesive.
  • a pressure-sensitive adhesive for example, a pressure-sensitive adhesive based on a polymer such as an acrylic polymer, a silicone-based polymer, a polyester, a polyurethane, a polyamide, a polyether, a fluorine-based polymer, or a rubber-based polymer is used.
  • an acrylic pressure-sensitive adhesive is used. This is because the acrylic pressure-sensitive adhesive is excellent in optical transparency, exhibits appropriate wettability, cohesiveness, and adhesiveness, and can be excellent in weather resistance, heat resistance, and the like.
  • an acrylic pressure-sensitive adhesive made of an acrylic polymer having 4 to 12 carbon atoms is preferable.
  • the thickness of the pressure-sensitive adhesive layer 14 is not particularly limited, and is, for example, about 1 to 400 ⁇ m. Further, the thickness of the pressure-sensitive adhesive layer 14 can be appropriately set in a preferable range depending on the method for producing the (meth) acrylic polymer used for the pressure-sensitive adhesive. For example, when a (meth) acrylic polymer is produced by solution polymerization or the like, the thickness of the pressure-sensitive adhesive layer 14 is preferably 1 to 100 ⁇ m, more preferably 2 to 50 ⁇ m, further preferably 2 to 40 ⁇ m, and 5 to 35 ⁇ m. Is particularly preferable.
  • the thickness of the pressure-sensitive adhesive layer 14 is preferably 50 to 400 ⁇ m, more preferably 75 to 300 ⁇ m, and even more preferably 100 to 200 ⁇ m. Solution polymerization is suitable for producing an acrylic polymer having such a thickness.
  • the elastic modulus of the pressure-sensitive adhesive layer 14 at 23 ° C. is preferably 0.00001 GPa to 10 GPa, more preferably 0.001 GPa to 8 GPa, and further preferably 0.001 GPa to 5 GPa. Within such a range, an optical film 10 having excellent flexibility and puncture resistance can be obtained.
  • the release film is not an essential configuration and is provided as needed.
  • the release film can be formed of, for example, a resin of polyethylene terephthalate (PET).
  • PET polyethylene terephthalate
  • the thickness of the release film is preferably 5 ⁇ m to 200 ⁇ m, more preferably 10 ⁇ m to 100 ⁇ m, and further preferably 30 ⁇ m to 50 ⁇ m.
  • the release film is peeled off at the interface with the pressure-sensitive adhesive layer 14 before the optical film 10 is attached to an optical element such as a liquid crystal cell.
  • the optical film 10 can be used as a viewing side polarizing plate, for example, when forming a liquid crystal panel.
  • the optical film 10 is provided, for example, on the visible side of the liquid crystal cell via an adhesive layer, and functions as a front plate of the liquid crystal panel.
  • the visual side means a side facing the side to be visually recognized when the predetermined member is applied to the image display device.
  • the optical film 10 is preferably used for, for example, an in-cell type liquid crystal element.
  • the in-cell type liquid crystal element is a liquid crystal element including a liquid crystal cell including a substrate in which a touch sensor is incorporated.
  • the inventors set the absolute value of the difference between the strain amount in the MD direction and the strain amount in the TD direction of the polarizing plate 13 under a predetermined temperature and humidity environment:
  • of the polarizing plate 13 in a constant temperature and humidity environment at a temperature of 60 ° C. and a humidity of 90% is 0 or more and 40 ⁇ 10-6 or less.
  • of the polarizing plate 13 under the heating environment test at a temperature of 80 ° C. is 0 or more and 250 ⁇ 10-6 or less.
  • the absolute value of the strain amount of the polarizing plate 13 becomes small, so that the influence of the strain amount of the polarizing plate 13 on the glass film 11 is reduced, and the length of the edge of the glass film 11 is 20 ⁇ m or more. Even if there are cracks in the above, the elongation of the cracks can be suppressed. In particular, when the polarizing plate 13 and the glass film 11 are bonded and integrated via a layer having a high elastic modulus such as an adhesive layer 12, a remarkable effect on crack elongation is exhibited.
  • the MD direction is the direction in which the molten resin flows inside the mold when the resin is melted and molded in the mold.
  • the TD direction is a direction orthogonal to the MD direction.
  • the thickness of the polarizer 131 may be reduced.
  • the second embodiment shows an example of an optical film having a layer structure different from that of the first embodiment.
  • the description of the same components as those in the above-described embodiment may be omitted.
  • FIG. 2 is a cross-sectional view illustrating the optical film according to the second embodiment.
  • the optical film 10A differs from the optical film 10 (see FIG. 1) in that the adhesive layer 12 is replaced with the adhesive layer 15.
  • the material of the pressure-sensitive adhesive layer 15 can be appropriately selected from, for example, illustrated as the material of the pressure-sensitive adhesive layer 14.
  • the thickness of the pressure-sensitive adhesive layer 15 is preferably 20 ⁇ m or more and 500 ⁇ m or less.
  • the elastic modulus of the pressure-sensitive adhesive layer 15 at 25 ° C. is preferably 1.0 ⁇ 10 5 Pa or more and 5.5 ⁇ 10 6 Pa or less, and 1.0 ⁇ 10 5 Pa or more and 1.0 ⁇ 10 6 Pa or less. The following is more preferable.
  • the transmission of the strain of the polarizing plate 13 to the glass film 11 is further relaxed. As a result, even if cracks having a length of 20 ⁇ m or more are present at the end of the glass film 11, the elongation of the cracks can be further suppressed.
  • the adhesive layer 12 having a thickness of about several ⁇ m is used for bonding the glass film 11 and the polarizing plate 13 as in the optical film 10 according to the first embodiment, 25 of the adhesive layer 12
  • the elastic modulus at ° C. is 1.0 ⁇ 10 5 Pa or more and 5.5 ⁇ 10 6 Pa or less
  • the elongation of cracks can be suppressed.
  • the elastic modulus of the adhesive layer 12 at 25 ° C. is 1.0 ⁇ 10 5 Pa or more and 1.0 ⁇ 10 6 Pa or less
  • the elongation of cracks can be further suppressed. Details of suppressing the elongation of cracks in the glass film will be described later in Examples.
  • polarizer having a thickness of 5 ⁇ m.
  • An acrylic resin film having a thickness of 20 ⁇ m and an elastic modulus of 2.5 GPa was bonded to one side of the polarizing element with a polyvinyl alcohol-based adhesive to obtain a polarizing plate A (thickness: 25 ⁇ m).
  • Polarizing Plate C A triacetyl cellulose film (TAC) having a thickness of 28 ⁇ m and having a saponified thickness of 40 ⁇ m and an elasticity of 3.6 GPa is applied to one side of the polarizer.
  • a polarizing plate C (thickness: 98 ⁇ m) was obtained in the same manner as in Production Example 1 except that an acrylic resin film having a thickness of 30 ⁇ m and an elasticity of 2.6 GPa was bonded to each other with a polyvinyl alcohol-based adhesive. ..
  • Polarizing Plate D A triacetyl cellulose film (TAC) having a thickness of 18 ⁇ m and having a saponified thickness of 40 ⁇ m and an elasticity of 3.6 GPa is applied to one side of the polarizer.
  • a polarizing plate D (thickness: 88 ⁇ m) was obtained in the same manner as in Production Example 1 except that an acrylic resin film having a thickness of 30 ⁇ m and an elasticity of 2.6 GPa was bonded to each other with a polyvinyl alcohol-based adhesive. ..
  • Dibenzoyl peroxide (Niper BMT, manufactured by Nippon Polyurethane Industry Co., Ltd.) 0.2 parts by weight as a peroxide in 100 parts by weight of the solid content of the acrylic polymer solution, and diglycidylaminomethylcyclohexane (Mitsubishi) as an epoxy-based cross-linking agent.
  • 0.05 parts by weight of Tetrad C) manufactured by Gas Chemicals 0.1 parts by weight of trimethylolpropane / tolylene diisocyanate adduct (Coronate L, manufactured by Nippon Polyurethane Industry Co., Ltd.) as an isocyanate-based cross-linking agent, and a silane coupling agent.
  • KBM403, manufactured by Shin-Etsu Chemical Industry Co., Ltd. 0.075 parts by weight were uniformly mixed and stirred to prepare an acrylic pressure-sensitive adhesive (solid content 10.9% by weight).
  • Example 1 (Preparation of optical film A) Adhesion of a 297 mm ⁇ 210 mm glass film (manufactured by Nippon Electric Glass Co., Ltd., trade name “OA-10G”, thickness: 100 ⁇ m) and a 287 mm ⁇ 200 mm polarizing plate A produced in Production Example 1 prepared in Production Example 6. They were bonded together via an adhesive layer composed of the agent. At this time, the polarizing plate A was arranged so that the acrylic film was on the glass film side. Next, the adhesive layer was irradiated with ultraviolet rays (500 mJ / cm 2 ) by a high-pressure mercury lamp to cure the adhesive layer. The adhesive layer had a thickness of 2 ⁇ m and an elastic modulus of 1.8 GPa.
  • an adhesive layer (thickness: 30 ⁇ m) composed of the adhesive prepared in Production Example 5 is formed on the surface of the optical film A opposite to the glass film with respect to the polarizing plate A, and the optical film A is formed.
  • the pressure-sensitive adhesive layer was formed as follows. (I) A silicone-treated polyethylene terephthalate film (manufactured by Mitsubishi Chemical Polyester Film Co., Ltd., thickness: 38 ⁇ m) was applied and heated at 155 ° C. for 1 minute to form an adhesive layer having a thickness of 30 ⁇ m after drying. ii) The pressure-sensitive adhesive layer was transferred from a polyethylene terephthalate film to a polarizing plate A to form a pressure-sensitive adhesive layer.
  • Example 2 An optical film B was produced in the same manner as in Example 1 except that the polarizing plate B produced in Production Example 2 was used instead of the polarizing plate A produced in Production Example 1.
  • a glass crack was made at the end of the glass film of the optical film A using a diamond cutter. Then, 350 ⁇ 250 mm ⁇ 1.0 mm thick non-alkali glass (manufactured by Corning Inc., trade name “EG-XG”) was prepared, and the optical film A processed into 100 mm square was placed on the non-alkali glass side with the adhesive layer. It was affixed to non-alkali glass. Then, the glass crack was extended from the end of the polarizing plate of the optical film A to the inside so that the length of the crack was 20 ⁇ m or more.
  • EG-XG non-alkali glass
  • a strain gauge 120 (FLA-3-11-3LJCT, manufactured by Tokyo Sokki Kenkyusho Co., Ltd.) was applied to the evaluation sample A bonded to the non-alkali glass 100, and a cyanoacrylate adhesive was applied. (Aron Alpha, manufactured by Toagosei Co., Ltd.) The strain gauge 120 was attached so that the center of the strain gauge 120 was located 15 mm in the X direction and 15 mm in the Y direction from one corner of the evaluation sample A.
  • the measurement axis of the strain gauge 120 (the long side direction of the gauge) is made parallel to the absorption axis direction of the evaluation sample A so that the amount of strain in the direction orthogonal to the polarizing plate absorption axis direction can also be measured. I made it.
  • the lead wire of the strain gauge 120 was connected to a data logger (TDS-530, manufactured by Tokyo Sokki Kenkyusho Co., Ltd.), the strain amount at room temperature (23 ° C.) was adjusted to 0 ⁇ , and then the strain gauge 120 was attached.
  • the evaluation sample A was put into a constant temperature and humidity test (temperature 60 ° C. and humidity 90%) for 15 minutes. Then, the strain amount during that period was measured every 15 sec, and the strain amount at the time of 200 sec (intermediate point) was read and used as the strain amount of the evaluation sample A. Further, the difference in the amount of strain was calculated by the absolute value of (the amount of strain in the MD direction-the amount of strain in the TD direction). In addition, the crack elongation was visually determined using a magnifying glass.
  • Judgment criteria are: ⁇ : Marked crack ends are not elongated (pass), ⁇ : Marked crack edges are greater than 0 mm and 10 mm or less, and 50% or less of the marked cracks are elongated. (Pass), ⁇ : The elongation of the marked crack end is larger than 0 mm and 10 mm or less, and 50 to 75% of the marked cracks are elongated (Pass), ⁇ : The extension of the marked crack end is 10 mm. Greater (failed).
  • evaluation samples B to D were prepared in the same manner as in the optical film A. Then, in the same manner as in the evaluation sample A, the strain amount was measured, the strain amount difference was calculated, and the crack elongation was visually determined. The evaluation results are shown in FIG. 4 together with the configuration of each evaluation sample.
  • the absolute value of the difference between the strain amount in the MD direction and the strain amount in the TD direction of the polarizing plate in a constant temperature and humidity environment at a temperature of 60 ° C. and a humidity of 90%
  • the polarizing plate preferably has a value of
  • in the polarizing plate in a constant temperature and humidity environment of 60 ° C. and 90% humidity is 0 or more and 10 ⁇ 10-6 or less. If it is within the range, it can be said that the elongation of cracks in the glass film can be further suppressed.
  • Example 3 An optical film E was obtained in the same manner as in Example 1.
  • Example 4 An optical film F was obtained in the same manner as in Example 2.
  • Example 5 An optical film G was produced in the same manner as in Example 1 except that the polarizing plate D produced in Production Example 4 was used instead of the polarizing plate A produced in Production Example 1.
  • the polarizing plate D was arranged so that the triacetyl cellulose film was on the glass film side.
  • Evaluation sample E (Example 3), evaluation sample F (Example 4), evaluation sample G (Example 5), and evaluation having cracks having a length of 20 ⁇ m or more in the same manner as the evaluation sample A.
  • Sample H (Comparative Example 3) was prepared. Then, in the same manner as in Evaluation 1, the strain amount of the evaluation samples E to H was changed, except that the test conditions were changed from the constant temperature and humidity test (temperature 60 ° C. and humidity 90%) to the heating environment test (temperature 80 ° C.). The crack elongation was visually determined by measurement, calculation of the difference in strain amount. The evaluation results are shown in FIG. 5 together with the configuration of each evaluation sample.
  • the polarizing plate preferably has a value of
  • Example 6 An adhesive layer composed of the adhesive prepared in Production Example 6 on the triacetyl cellulose film side of the polarizing plate C by using the polarizing plate C produced in Production Example 3 instead of the polarizing plate A produced in Production Example 1 ( An optical film I was produced in the same manner as in Example 1 except that it was bonded to a glass film via a thickness: 2 ⁇ m and an elastic coefficient: 5.27 GPa).
  • Example 7 A pressure-sensitive adhesive layer composed of the pressure-sensitive adhesive prepared in Production Example 5 on the triacetyl cellulose film side of the polarizing plate C using the polarizing plate C produced in Production Example 3 in place of the polarizing plate A produced in Production Example 1 ( An optical film J was produced in the same manner as in Example 1 except that it was bonded to a glass film via a thickness: 20 ⁇ m and an elastic coefficient: 0.12 GPa).
  • Example 8 A pressure-sensitive adhesive layer composed of the pressure-sensitive adhesive prepared in Production Example 5 on the triacetyl cellulose film side of the polarizing plate C using the polarizing plate C produced in Production Example 3 in place of the polarizing plate A produced in Production Example 1 ( An optical film K was produced in the same manner as in Example 1 except that it was bonded to a glass film via a thickness (thickness: 250 ⁇ m, elastic coefficient: 0.14 GPa).
  • each of the polarizers is 28 ⁇ m. Therefore, referring to the results of FIGS. 4 and 5,
  • the elastic modulus of the pressure-sensitive adhesive layer or the adhesive layer for bonding the glass film and the polarizing plate at 25 ° C. is 1.0 ⁇ 10 5 Pa or more and 5.5 ⁇ 10. If it is 6 Pa or less, it can be said that the elongation of cracks in the glass film can be suppressed. If the elastic modulus of the pressure-sensitive adhesive layer or the adhesive layer that adheres the glass film and the polarizing plate at 25 ° C. is 1.0 ⁇ 10 5 Pa or more and 1.0 ⁇ 10 6 Pa or less, the cracks in the glass film It can be said that the elongation can be further suppressed.
  • the use of more than the thickness 20 ⁇ m of the pressure-sensitive adhesive layer for bonding between the glass film and the polarizing plate may be a value close to the elastic modulus at 25 ° C. to 1.0 ⁇ 10 5 Pa, the cracks of the glass film Elongation can be further suppressed.
  • the thickness of the pressure-sensitive adhesive layer is preferably 500 ⁇ m or less.
  • it is preferable to reduce the thickness of the polarizer and set
  • the characteristics of the pressure-sensitive adhesive layer or the adhesive layer should be selected instead of the measures of reducing the thickness of the polarizer and setting
  • the elastic modulus of the pressure-sensitive adhesive layer or the adhesive layer for bonding the glass film and the polarizer at 25 ° C. is preferably 1.0 ⁇ 10 5 Pa or more and 5.5 ⁇ 10 6 Pa or less. , 1.0 ⁇ 10 5 Pa or more, more preferably 1.0 ⁇ 10 6 Pa or less.
  • the elastic modulus at 25 ° C. can be made extremely low.
  • measures are taken to reduce the thickness of the polarizing element so that

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
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