WO2023276931A1 - Film polarisant, et dispositif d'affichage d'image - Google Patents

Film polarisant, et dispositif d'affichage d'image Download PDF

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Publication number
WO2023276931A1
WO2023276931A1 PCT/JP2022/025523 JP2022025523W WO2023276931A1 WO 2023276931 A1 WO2023276931 A1 WO 2023276931A1 JP 2022025523 W JP2022025523 W JP 2022025523W WO 2023276931 A1 WO2023276931 A1 WO 2023276931A1
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Prior art keywords
meth
acrylate
polarizing
polarizer
film
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PCT/JP2022/025523
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English (en)
Japanese (ja)
Inventor
優人 座間
達也 山崎
裕宗 春田
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 JP2023531922A priority Critical patent/JPWO2023276931A1/ja
Priority to CN202280032363.6A priority patent/CN117280256A/zh
Priority to KR1020237031770A priority patent/KR20240023016A/ko
Publication of WO2023276931A1 publication Critical patent/WO2023276931A1/fr

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    • 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
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J201/00—Adhesives based on unspecified macromolecular compounds
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G02B1/14—Protective coatings, e.g. hard coatings
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G—PHYSICS
    • 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
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80—Constructional details
    • H10K59/8793—Arrangements for polarized light emission

Definitions

  • the present invention relates to a polarizing film in which a transparent protective film is laminated on at least one surface of a polarizer via an adhesive layer.
  • the polarizing film can form an image display device such as a mobile phone, a car navigation device, a monitor for a personal computer, or a television as an optical film laminated with the polarizing film alone.
  • the non-polarizing portion of the polarizer is structurally more likely to be recessed than the other portion (polarizing portion) of the polarizer, so the polarizing film was produced using the polarizer having the non-polarizing portion. In this case, air bubbles may remain in the vicinity of the concave portion of the non-polarizing portion.
  • An object of the present invention is to provide a display device.
  • the present invention is a polarizing film in which a transparent protective film is laminated on at least one surface of a polarizer via an adhesive layer, wherein the polarizer has a non-polarizing portion having a concave portion formed on one surface thereof.
  • the hardness of the non-polarizing portion is H1 (GPa)
  • the thickness of the thinnest portion is d1 ( ⁇ m)
  • the hardness of the portion of the adhesive layer in contact with the recess is H2 (GPa)
  • the thickest portion When the thickness of is d2 ( ⁇ m), H2 ⁇ (d2/d1) ⁇ 0.01
  • a polarizing film (1) characterized by:
  • polarizing film (2) when the stress relaxation rate of the portion of the adhesive layer in contact with the recess is O2, O2 ⁇ 70% A polarizing film (2) is preferred.
  • the polarizing film (3) satisfying H1 ⁇ d1>1.3 is preferable.
  • any one of the polarizing films (1) to (3) above when the hardness of the transparent protective film laminated on the recess side of the polarizer is H3 (GPa) and the thickness is d3 ( ⁇ m), H3 ⁇ d3>4 A polarizing film (4) is preferred.
  • the polarizing film (6) has an adhesive layer thickness of 2 ⁇ m or less between a portion of the polarizer other than the non-polarizing portion and the transparent protective film. preferable.
  • the present invention comprises the polarizing film according to any one of the above (1) to (6), wherein the non-polarizing portion of the polarizing film is arranged at a position corresponding to the sensor portion. It relates to a display device.
  • the polarizing film according to the present invention has excellent visibility even under high temperature and high humidity conditions, in spite of having a polarizer having a non-polarizing portion. The reason why such an effect is obtained can be presumed as follows.
  • the polarizing portion of the polarizer provided in the polarizing film shrinks, while the non-polarizing portion stretches. tend to be
  • the bubbles expand as the non-polarizing portion is stretched. Since the bubbles have a refractive index difference from that of the non-polarized portion, when the bubbles near the non-polarized portion in the polarizing film expand, visibility in the non-polarized portion tends to deteriorate.
  • the hardness of the non-polarizing portion of the polarizer is H1 (GPa)
  • the thickness of the thinnest portion of the non-polarizing portion of the polarizer is d1 ( ⁇ m)
  • the polarizer and the transparent protective film are bonded.
  • H2 (GPa) is the hardness of the portion of the adhesive layer that contacts the concave portion of the non-polarizing portion of the polarizer, and the portion of the adhesive layer that contacts the concave portion of the non-polarizing portion of the polarizer.
  • d2 ( ⁇ m) is the thickness of the thickest portion
  • the reason why the above effect is obtained in the present invention is that the relational expression H2 ⁇ (d2/d1) ⁇ 0.01 is satisfied.
  • d1 is relatively thinner than d2, that is, when (d2/d1) is large, the thickness of the adhesive layer is sufficiently secured, so even if the polarizing film is placed under high temperature and high humidity, , deformation of the polarizing portion and the non-polarizing portion of the polarizer due to heat can be suppressed, so expansion of the bubbles can be suppressed. Therefore, even if H2 is relatively small, the above relational expression is satisfied. As a result, the visibility of the polarizing film is excellent even under high temperature and high humidity.
  • FIG. 1 shows an example of a cross-sectional schematic diagram of a polarizing film according to one embodiment of the present invention.
  • a polarizing film 10 of this embodiment is obtained by laminating a transparent protective film 3 on one side of a polarizer 1 with an adhesive layer 2 interposed therebetween.
  • a transparent protective film may be laminated on both sides of the polarizer via an adhesive layer.
  • a polarizer 1 is formed with a polarizing portion 1A having a concave portion 1h on one side.
  • a method for forming the non-polarizing portion of the polarizer will be described later.
  • the concave portion 1h is provided only on the upper side of the drawing, and no concave portion is provided on the lower side of the drawing.
  • the polarizer face may be somewhat concave.
  • the side with the larger depth of the recess (usually, the recess on the side of the surface processed to form the non-polarizing portion in the polarizer) is defined as the recess 1h.
  • the polarizing film 10 shown in FIG. of the adhesive layer 2 adhering to the transparent protective film 3 the hardness of the portion in contact with the concave portion 1h of the non-polarizing portion 1A of the polarizer 1 is H2 (GPa). It is designed so that H2 ⁇ (d2/d1) ⁇ 0.01, where d2 ( ⁇ m) is the thickness of the thickest portion of the portion in contact with the concave portion 1h of the non-polarizing portion 1A.
  • the thickness and/or hardness of the adhesive layer are sufficiently ensured, and the polarizing portion and the non-polarizing portion of the polarizer are formed. Since deformation due to heat can be suppressed, it is possible to suppress the expansion of air bubbles under high temperature and high humidity, and the visibility of the polarizing film 10 can be improved. From the viewpoint of improving the visibility of the polarizing film, H2 ⁇ (d2/d1) ⁇ 0.03 is preferable, and H2 ⁇ (d2/d1) ⁇ 0.07 is more preferable.
  • the polarizing film is required not to curl (good curling property), but if the above "H2 ⁇ (d2/d1)" is too high, the curling property may deteriorate. Therefore, 0.35 ⁇ H2 ⁇ (d2/d1) is preferable, and 0.23 ⁇ H2 ⁇ (d2/d1) is more preferable.
  • a portion of the adhesive layer 2 that adheres the polarizer 1 and the transparent protective film 3, which is in contact with the concave portion 1h of the non-polarizing portion 1A of the polarizer 1 It means the entire portion overlapping with the concave portion 1h. Methods for measuring the hardnesses H1 and H2 and the thicknesses d1 and d2 will be described later.
  • the stress relaxation rate of the portion of the adhesive layer 2 that bonds the polarizer 1 and the transparent protective film 3, which is in contact with the concave portion 1h of the non-polarizing portion 1A of the polarizer 1, is O2.
  • O2 ⁇ 70% even if bubbles remain in the vicinity of the concave portion 1h of the non-polarizing portion 1A of the polarizing film 10, the expansion of the bubbles under high temperature and high humidity is more effectively prevented. It is preferable because it can be suppressed. Further, it is more preferable that O2 ⁇ 65%. Also, it is preferable that 10% ⁇ O2. A method for measuring the stress relaxation rate O2 will be described later.
  • the thickness and/or hardness of the non-polarizing portion 1A when the thickness and/or hardness of the non-polarizing portion 1A is sufficiently ensured, specifically when H1 ⁇ d1>1.3, the deformation of the non-polarizing portion 1A is suppressed. Therefore, even if bubbles remain in the vicinity of the concave portion 1h of the non-polarizing portion 1A of the polarizing film 10, the expansion of the bubbles under high temperature and high humidity conditions can be more effectively suppressed, which is preferable. . Moreover, it is preferable that 1.35>H1 ⁇ d1.
  • the hardness of the transparent protective film 3 laminated on the concave portion 1h side of the non-polarizing portion 1A of the polarizer 1 is H3 (GPa) and the thickness is d3 ( ⁇ m)
  • H3xd3>4 it becomes difficult to deform
  • the portion of the adhesive layer 2 that is in contact with the concave portion 1h of the non-polarizing portion 1A of the polarizer 1 is less likely to deform.
  • H3 ⁇ d3>7 is preferable, H3 ⁇ d3>10 is more preferable, and H3 ⁇ d3>13 is particularly preferable. .
  • H3 ⁇ d3>13 is particularly preferable.
  • the non-polarizing portion of the polarizing film 10 Even if bubbles remain in the vicinity of the concave portion 1h of 1A, expansion of the bubbles under high temperature and high humidity can be suppressed more effectively, which is preferable. A method for measuring the depth dh will be described later.
  • the polarizing film 10 shown in FIG. 1 when the thickness of the adhesive layer between the portion other than the non-polarizing portion 1A of the polarizer 1 (hereinafter also referred to as "polarizing portion") and the transparent protective film 3 is 2 ⁇ m or less, It is preferable because expansion of air bubbles under high temperature and high humidity can be suppressed while maintaining the wet heat durability of the polarizing film.
  • the transparent protective film 3 is laminated on one side of the polarizer 1 via the adhesive layer 2, but in the polarizing film according to the present invention, for example, the polarizer 1, the same or different transparent protective film, retardation film, or retardation layer may be further provided on the surface opposite to the surface on which the transparent protective film 3 is laminated via an adhesive layer.
  • the transparent protective film, retardation film, and retardation layer will be described later.
  • a polarizer included in the polarizing film is composed of a resin film containing a dichroic substance.
  • a non-polarizing portion is formed in the polarizer.
  • the non-polarizing portion is typically a portion (low-concentration portion) in which the content of the dichroic substance is lower than that of the portion other than the non-polarizing portion of the polarizer.
  • the non-polarizing portion in the present invention may be a layer from which the dichroic material is removed from the polarizer, or may be another layer containing no dichroic material, and is not limited to these.
  • cracks and delamination can be reduced mechanically (for example, by a method of mechanically removing using an engraving blade punch, plotter, water jet, etc.) compared to the case where through holes are formed. Quality problems such as delamination (delamination) and glue extrusion are avoided.
  • a method of introducing a non-polarizing portion into a polarizer a method of extracting a dichroic substance from the polarizer by chemical treatment and decolorizing it to form a non-polarizing portion in the polarizer (hereinafter referred to as "chemical treatment method”
  • chemical treatment method a method of forming a non-polarized portion by decomposing a dichroic substance with laser light or the like (hereinafter also referred to as a “laser method”).
  • the chemical treatment method can adjust the content of the dichroic substance itself in the non-polarized portion to be low, and maintains the transparency of the non-polarized portion better than the laser method. preferable.
  • the number, arrangement, shape, size, etc. of the non-polarizing portions can be appropriately designed. For example, it is designed according to the position, shape, size, etc. of the sensor section of the image display device to be mounted. Specifically, it is designed so that the non-polarizing portion does not correspond to the portion other than the sensor of the image display device (for example, the image display portion).
  • the transmittance of the non-polarized portion (for example, transmittance measured with light having a wavelength of 550 nm at 23° C.) is preferably 50% or more, more preferably 60% or more, still more preferably 75% or more, and particularly preferably 90% or more. is. With such a transmittance, desired transparency can be ensured. For example, when the non-polarizing portion corresponds to the sensor portion of the image display device, it is possible to prevent adverse effects on the imaging performance of the sensor.
  • the polarizer preferably exhibits absorption dichroism in the wavelength range of 380 nm to 780 nm.
  • Single transmittance (Ts) of the polarizing portion of the polarizer is preferably 39% or more, more preferably 39.5% or more, still more preferably 40% or more, and particularly preferably 40.5% or more.
  • the theoretical upper limit of single transmittance is 50%, and the practical upper limit is 46%.
  • the single transmittance (Ts) is the Y value measured with a JIS Z8701 2-degree field of view (C light source) and corrected for visibility. name: V7100).
  • the degree of polarization of the polarizing portion of the polarizer is preferably 99.8% or higher, more preferably 99.9% or higher, and even more preferably 99.95% or higher.
  • the thickness of the polarizer can be set to any appropriate value.
  • the thickness of the polarizer is typically 0.5 ⁇ m to 80 ⁇ m.
  • the thickness is preferably 30 ⁇ m or less, more preferably 25 ⁇ m or less, even more preferably 18 ⁇ m or less, particularly preferably 12 ⁇ m or less, and even more preferably less than 8 ⁇ m.
  • the thickness is preferably 1 ⁇ m or more. As the thickness of the resin film to be the polarizer is thinner, the content of the dichroic substance can be reduced in a shorter period of time in the step of contacting with the basic solution, which will be described later.
  • dichroic substance examples include iodine and organic dyes. These may be used alone or in combination of two or more. Iodine is preferably used. This is because a non-polarized portion can be favorably formed by contact with a basic solution, which will be described later.
  • the content of the dichroic substance in the non-polarizing portion is preferably 1.0% by mass or less, more preferably 0.5% by mass or less, and even more preferably 0.2% by mass or less. If the content of the dichroic substance in the non-polarizing portion is within this range, the desired transparency can be sufficiently imparted to the non-polarizing portion. Therefore, for example, when the non-polarizing portion is made to correspond to the sensor portion of the image display device, extremely excellent shooting performance can be achieved in terms of both brightness and color. On the other hand, the lower limit of the content of the dichroic substance in the non-polarized portion is usually below the detection limit.
  • the iodine content can be obtained from, for example, a calibration curve prepared in advance using standard samples from X-ray intensities measured by fluorescent X-ray analysis.
  • the difference between the content of the dichroic substance in other parts and the content of the dichroic substance in the non-polarized portion is preferably 0.5% by mass or more, more preferably 1% by mass or more.
  • PVA-based resin a polyvinyl alcohol-based resin
  • PVA-based resins include polyvinyl alcohol and ethylene-vinyl alcohol copolymers.
  • Polyvinyl alcohol is obtained by saponifying polyvinyl acetate.
  • An ethylene-vinyl alcohol copolymer is obtained by saponifying an ethylene-vinyl acetate copolymer.
  • the saponification degree of the PVA-based resin is usually 85 mol% or more and less than 100 mol%, preferably 95.0 mol% to 99.95 mol%, more preferably 99.0 mol% to 99.93 mol%. be.
  • the degree of saponification can be determined according to JIS K 6726-1994. By using a PVA-based resin having such a degree of saponification, a polarizer with 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 can be appropriately selected depending on the purpose.
  • the average degree of polymerization is usually 1,000 to 10,000, preferably 1,200 to 4,500, more preferably 1,500 to 4,300.
  • the average degree of polymerization can be determined according to JIS K 6726-1994.
  • a polarizer having a non-polarizing portion can be produced by a chemical treatment method in which a resin film containing a dichroic substance is brought into contact with a treatment liquid, such as a basic solution.
  • a treatment liquid such as a basic solution.
  • the iodine content of the contact portion can be easily reduced (decolorized) by contacting the desired portion of the resin film with a basic solution.
  • the contact may allow the basic solution to penetrate into the interior of the resin film.
  • the iodine complex contained in the resin film is reduced by the base contained in the basic solution to become iodine ions. By reducing the iodine complex to iodine ions, the transmittance of the contact portion can be improved.
  • the iodine converted into iodine ions moves from the resin film into the solvent of the basic solution.
  • the non-polarized portion thus obtained can maintain its transparency satisfactorily.
  • the iodine complex is destroyed to improve the transmittance, the iodine remaining in the resin film forms an iodine complex again with the use of the polarizer, which may reduce the transmittance. Such problems are prevented when the content is reduced.
  • Any appropriate method can be adopted as a method for contacting the basic solution. Examples thereof include a method of dropping, coating, or spraying a basic solution onto a resin film, and a method of immersing a resin film in a basic solution.
  • the resin film may be protected with any suitable protective material so that the basic solution does not come into contact with any part other than the desired part (so that the content of the dichroic substance does not decrease) when the basic solution comes into contact.
  • protective materials for resin films include protective films and surface protective films.
  • the protective film can be used as it is as a protective film for the polarizer.
  • a surface protective film is used temporarily during the production of a polarizer. Since the surface protection film is removed from the resin film at any appropriate timing, it is typically attached to the resin film via an adhesive layer.
  • Another specific example of the protective material is photoresist.
  • any appropriate basic compound can be used as the basic compound.
  • Examples of basic compounds include alkali metal hydroxides such as sodium hydroxide, potassium hydroxide and lithium hydroxide, alkaline earth metal hydroxides such as calcium hydroxide, and inorganic alkali metal salts such as sodium carbonate. , organic alkali metal salts such as sodium acetate, aqueous ammonia, and the like.
  • alkali metal and/or alkaline earth metal hydroxides are preferably used, and sodium hydroxide, potassium hydroxide and lithium hydroxide are more preferably used. This is because the dichroic substance can be efficiently ionized, and the non-polarization portion can be formed more easily.
  • These basic compounds may be used alone or in combination of two or more.
  • any appropriate solvent can be used as the solvent for the basic solution.
  • Specific examples include water, alcohols such as ethanol and methanol, ethers, benzene, chloroform, and mixed solvents thereof.
  • water and alcohol are preferably used because the ionized dichroic substance can be transferred well to the solvent.
  • the concentration of the basic solution is, for example, 0.01N to 5N, preferably 0.05N to 3N, more preferably 0.1N to 2.5N. If the concentration is within such a range, the desired non-polarized portion can be formed satisfactorily.
  • the liquid temperature of the basic solution is, for example, 20°C to 50°C.
  • the contact time of the basic solution is set according to, for example, the thickness of the resin film and the type and concentration of the basic compound contained in the basic solution.
  • the contact time is, for example, 5 seconds to 30 minutes, preferably 5 seconds to 5 minutes.
  • the surface of the resin film is covered with a surface protective film so that at least a portion thereof is exposed when it comes into contact with a basic solution.
  • a surface protective film is produced by bonding a polarizer (resin film) with a surface protective film having small circular through holes, and contacting this with a basic solution.
  • the other side of the resin film is also protected.
  • the resin film may be elongated.
  • roll-to-roll refers to stacking while aligning the longitudinal directions of roll-shaped films while conveying them.
  • Through-holes are formed in the elongated surface protective film at predetermined intervals in the longitudinal direction and/or the width direction thereof, for example.
  • the method for producing a polarizer using the long resin film and the surface protective film used for producing the long resin film are disclosed in JP-A-2016-027135 and JP-A-2016-027136. , JP-A-2016-027137, JP-A-2016-027138, and JP-A-2016-027139, which are incorporated herein by reference.
  • the resin film be in a state where it can be used as a polarizer when it is brought into contact with the basic solution.
  • various treatments such as swelling treatment, stretching treatment, dyeing treatment with the dichroic substance, cross-linking treatment, washing treatment, and drying treatment are preferably performed.
  • the resin film may be a resin layer formed on a substrate.
  • a laminate of a base material and a resin layer can be obtained, for example, by a method of applying a coating liquid containing the resin film-forming material to the base material, a method of laminating a resin film on the base material, or the like.
  • the above dyeing treatment is typically performed by adsorbing a dichroic substance.
  • the adsorption method include a method of immersing the resin film in a dyeing solution containing a dichroic substance, a method of coating the resin film with the dyeing solution, and a method of spraying the resin film with the dyeing solution.
  • a preferred method is to immerse the resin film in a dyeing solution. This is because the dichroic substance can be well adsorbed.
  • an iodine aqueous solution is preferably used as the staining solution.
  • the amount of iodine compounded is preferably 0.04 parts by mass to 5.0 parts by mass with respect to 100 parts by mass of water.
  • an iodide is preferably used as the iodide.
  • the amount of iodide compounded is preferably 0.3 parts by mass to 15 parts by mass with respect to 100 parts by mass of water.
  • the resin film is typically uniaxially stretched 3 to 7 times.
  • the stretching direction can correspond to the absorption axis direction of the resulting polarizer.
  • the contact surface (non-polarized portion) of the basic solution is recessed compared to the other polarized portion, thereby forming a recess in the non-polarized portion. be done.
  • the maximum depth of the concave portion varies depending on the thickness of the polarizer and the contact conditions (temperature, time, etc.) with the basic solution, but is 0.1 to 2.0 ( ⁇ m), particularly 0.1 to 1.0 ⁇ m. When it is 0 ( ⁇ m), visibility of the polarizing film can be easily improved under high temperature and high humidity, which is preferable.
  • the thickness and hardness of the non-polarizing portion depend on the manufacturing conditions of the non-polarizing portion (e.g., polarizing in a 1 mol/L (1N) sodium hydroxide aqueous solution).
  • film immersion time (seconds) "polarizing film immersion time in 1 mol/L (1N) hydrochloric acid (seconds)”
  • drying temperature after NaOH treatment and HCl treatment (°C) etc. It can be changed by making appropriate adjustments.
  • any appropriate step may be further included as necessary when manufacturing the polarizer used in the present invention. Examples include a step of reducing alkali metals and/or alkaline earth metals, and removing the basic solution. These steps are performed at any appropriate stage of the manufacturing method described above.
  • hydroxides of alkali metals and/or alkaline earth metals can remain in the contact area.
  • metal salts of alkali metals and/or alkaline earth metals can be generated at the contact portion. These can generate hydroxide ions, and the generated hydroxide ions act (decompose/reduce) dichroic substances (e.g., iodine complexes) present around the contact area, resulting in non-polarized regions (low concentration range) can be widened.
  • Specific examples of the method for removing the basic solution and/or the post-crosslinking solution include washing, wiping removal with a waste cloth, suction removal, natural drying, heat drying, air drying, and reduced pressure drying.
  • Cleaning liquids used for cleaning include, for example, water (pure water), alcohols such as methanol and ethanol, and mixtures thereof. Water is preferably used.
  • the number of washings is not particularly limited, and washing may be performed multiple times.
  • the drying temperature is, for example, 20°C to 100°C.
  • a transparent protective film is laminated on at least one surface of a polarizer via an adhesive layer.
  • the same or different transparent protective film may be further provided via an adhesive layer on the surface of the polarizer opposite to the surface on which the transparent protective film is laminated. .
  • thermoplastic resins which are excellent in transparency, mechanical strength, thermal stability, water barrier properties, isotropy, etc., are used as materials for the transparent protective film.
  • thermoplastic resins include cellulose resins such as triacetyl cellulose, polyester resins, polyethersulfone resins, polysulfone resins, polycarbonate resins, polyamide resins, polyimide resins, polyolefin resins, (meth)acrylic resins, cyclic Polyolefin resins (norbornene-based resins), polyarylate resins, polystyrene resins, polyvinyl alcohol resins, and mixtures thereof.
  • cellulose resins such as triacetyl cellulose, polyester resins, polyethersulfone resins, polysulfone resins, polycarbonate resins, polyamide resins, polyimide resins, polyolefin resins, (meth)acrylic resins, cyclic Polyolefin resins (norbornene-based resins
  • additives include ultraviolet absorbers, antioxidants, lubricants, plasticizers, release agents, anti-coloring agents, flame retardants, nucleating agents, antistatic agents, pigments, and colorants.
  • the content of the thermoplastic resin in the transparent protective film is preferably 50 to 100% by mass, more preferably 50 to 99% by mass, still more preferably 60 to 98% by mass, and particularly preferably 70 to 97% by mass. . If the content of the thermoplastic resin in the transparent protective film is 50% by mass or less, there is a possibility that the high transparency inherent in the thermoplastic resin cannot be sufficiently exhibited.
  • the material for forming the transparent protective film a material having excellent transparency, mechanical strength, thermal stability, moisture barrier properties, isotropy, etc. is preferable, and in particular, a material having a moisture permeability of 150 g/m 2 /24h or less. is more preferred, 140 g/m 2 /24h or less is particularly preferred, and 120 g/m 2 /24h or less is even more preferred.
  • a functional layer such as a hard coat layer, an antireflection layer, an antisticking layer, a diffusion layer or an antiglare layer can be provided on the surface of the transparent protective film to which the polarizer is not adhered.
  • Functional layers such as the hard coat layer, antireflection layer, anti-sticking layer, diffusion layer, and antiglare layer can be provided on the transparent protective film itself, or can be provided separately from the transparent protective film. can also
  • the thickness of the transparent protective film can be determined as appropriate, but is generally about 1 to 500 ⁇ m, preferably 1 to 300 ⁇ m, more preferably 5 to 200 ⁇ m, from the viewpoint of strength, workability such as handleability, and thinness. preferable. Further, it is preferably 10 to 200 ⁇ m, more preferably 20 to 80 ⁇ m.
  • a retardation film having a front retardation of 40 nm or more and/or a thickness direction retardation of 80 nm or more can be used as the transparent protective film.
  • the front retardation is usually controlled in the range of 40-200 nm
  • the thickness direction retardation is usually controlled in the range of 80-300 nm.
  • a retardation film may be further provided via an adhesive layer on the surface of the polarizer opposite to the surface on which the transparent protective film is laminated.
  • the retardation film examples include a birefringent film obtained by uniaxially or biaxially stretching a polymer material, an oriented film of a liquid crystal polymer, and a film in which an oriented layer of a liquid crystal polymer is supported.
  • the thickness of the retardation film is not particularly limited, it is generally about 20 to 150 ⁇ m.
  • Re [450] and Re [550] are the in-plane retardation values of the retardation film measured with light having wavelengths of 450 nm and 550 nm, respectively, at 23 ° C.
  • ⁇ n is the slow phase of the retardation film
  • In-plane birefringence that is nx-ny when the refractive indices in the axial direction and the fast axis direction are nx and ny, respectively
  • NZ is the refractive index in the thickness direction of the retardation film, (ratio of nx-nz, which is birefringence in the thickness direction, to nx-ny, which is in-plane birefringence) may be used.
  • a retardation layer may be provided in the polarizing film according to the present invention.
  • the retardation layer may be a single layer or multiple layers, and the retardation layer may also serve as a protective layer for the polarizer.
  • a retardation layer may be provided via an adhesive layer on the surface of the polarizer opposite to the surface on which the transparent protective film is laminated. The type, number, combination, arrangement position, and characteristics of the retardation layer can be appropriately set according to the purpose.
  • a liquid crystalline compound is preferably used for forming the retardation layer.
  • a solvent containing the liquid crystalline compound can be applied using, for example, a wire bar, gap coater, comma coater, gravure coater, slot die, or the like.
  • the applied liquid crystalline solution may be dried naturally or dried by heating.
  • the liquid crystalline solution is preferably applied at a concentration lower than the isotropic phase-liquid crystal phase transition concentration, that is, in an isotropic phase state. In this case, the orientation can be stably achieved by a method such as rubbing treatment or photo-orientation.
  • a transparent protective film is laminated on at least one surface of a polarizer via an adhesive layer.
  • an adhesive layer can be formed of, for example, a cured product layer of a curable resin composition.
  • the hardness of the non-polarizing portion formed in the polarizer is H1 (GPa)
  • the thickness of the thinnest portion is d1 ( ⁇ m)
  • the hardness of the portion in contact with the recess of the adhesive layer is H2 (GPa).
  • the design is such that H2.times.(d2/d1).gtoreq.0.01.
  • the material constituting the adhesive layer so as to satisfy H2 ⁇ (d2/d1) ⁇ 0.01 may be only the curable resin composition described later, or the curable resin composition may be used in combination with an easily adhesive composition. You may
  • the thickness of the adhesive layer between the polarizing portion of the polarizer 1 and the transparent protective film 3 is preferably 2 ⁇ m or less, more preferably 1.8 ⁇ m or less.
  • the lower limit of the thickness of the adhesive layer is preferably 0.5 ⁇ m in order to ensure adhesiveness.
  • the curable resin composition can be classified into a radically polymerizable curable resin composition and a cationically polymerizable curable resin composition.
  • active energy rays with a wavelength range of 10 nm to less than 380 nm are expressed as ultraviolet rays
  • active energy rays with a wavelength range of 380 nm to 800 nm are expressed as visible rays.
  • Examples of monomer components constituting the radically polymerizable curable resin composition include compounds having radically polymerizable functional groups of carbon-carbon double bonds such as (meth)acryloyl groups and vinyl groups. These monomer components can be either monofunctional radically polymerizable compounds or multifunctional radically polymerizable compounds having two or more polymerizable functional groups. Moreover, these radical polymerizable compounds can be used individually by 1 type or in combination of 2 or more types. As these radically polymerizable compounds, for example, compounds having a (meth)acryloyl group are suitable. In the present invention, (meth)acryloyl means an acryloyl group and/or a methacryloyl group, and "(meth)" has the same meaning below.
  • Examples of monofunctional radically polymerizable compounds include (meth)acrylamide derivatives having a (meth)acrylamide group.
  • a (meth)acrylamide derivative is preferable in terms of ensuring adhesiveness to a polarizer and various transparent protective films, and in terms of high polymerization rate and excellent productivity.
  • (meth)acrylamide derivatives include N-methyl(meth)acrylamide, N,N-dimethyl(meth)acrylamide, N,N-diethyl(meth)acrylamide, N-isopropyl(meth)acrylamide, N - N-alkyl group-containing (meth)acrylamide derivatives such as butyl (meth)acrylamide and N-hexyl (meth)acrylamide; N-methylol (meth)acrylamide, N-hydroxyethyl (meth)acrylamide, N-methylol-N- N-hydroxyalkyl group-containing (meth)acrylamide derivatives such as propane (meth)acrylamide; N-aminoalkyl group-containing (meth)acrylamide derivatives such as aminomethyl (meth)acrylamide and aminoethyl (meth)acrylamide; N-methoxymethyl N-alkoxy group-containing (meth)acrylamide derivatives such as acrylamide and N-ethoxymethylacrylamide; N-mercaptoal
  • heterocycle-containing (meth)acrylamide derivative in which the nitrogen atom of the (meth)acrylamide group forms a heterocycle includes, for example, N-acryloylmorpholine, N-acryloylpiperidine, N-methacryloylpiperidine, N-acryloylpyrrolidine etc.
  • N-hydroxyalkyl group-containing (meth)acrylamide derivatives are preferred from the viewpoint of adhesion to polarizers and various transparent protective films.
  • various (meth)acrylic acid derivatives having a (meth)acryloyloxy group are preferred from the viewpoint of adhesion to polarizers and various transparent protective films.
  • Examples of the (meth)acrylic acid derivative include cycloalkyl (meth)acrylates such as cyclohexyl (meth)acrylate and cyclopentyl (meth)acrylate; aralkyl (meth)acrylates such as benzyl (meth)acrylate; 2-isobornyl (meth) acrylate, 2-norbornylmethyl (meth) acrylate, 5-norbornen-2-yl-methyl (meth) acrylate, 3-methyl-2-norbornylmethyl (meth) acrylate, dicyclopentenyl (meth) )
  • Polycyclic (meth)acrylates such as acrylate, dicyclopentenyloxyethyl (meth)acrylate, dicyclopentanyl (meth)acrylate; 2-methoxyethyl (meth)acrylate, 2-ethoxy Ethyl (meth) acrylate, 2-methoxymethoxyethyl (meth) acrylate, 3-
  • the (meth)acrylic acid derivatives include 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, 2-hydroxybutyl (meth)acrylate, 4- Hydroxyalkyl (meth)acrylates such as hydroxybutyl (meth)acrylate, 6-hydroxyhexyl (meth)acrylate, 8-hydroxyoctyl (meth)acrylate, 10-hydroxydecyl (meth)acrylate and 12-hydroxylauryl (meth)acrylate and hydroxyl group-containing (meth)acrylates such as [4-(hydroxymethyl)cyclohexyl]methylacrylate, cyclohexanedimethanol mono(meth)acrylate, 2-hydroxy-3-phenoxypropyl (meth)acrylate; glycidyl (meth)acrylate, Epoxy group-containing (meth)acrylates such as 4-hydroxybutyl (meth)acrylate glycidyl ether; 2,2,
  • alkylaminoalkyl (meth)acrylates such as dimethylaminoethyl (meth)acrylate; 3-oxetanylmethyl (meth)acrylate, 3-methyl-oxetanylmethyl (meth)acrylate, 3-ethyl-oxetanylmethyl (meth)acrylate , 3-Butyl-oxetanylmethyl (meth)acrylate, 3-hexyloxetanylmethyl (meth)acrylate, and other oxetane group-containing (meth)acrylates; Tetrahydrofurfuryl (meth)acrylate, butyrolactone (meth)acrylate, and other heterocycles and (meth) acrylates, hydroxypivalic acid neopentyl glycol (meth) acrylic acid adducts, p-phenylphenol (meth) acrylate and the like.
  • examples of monofunctional radically polymerizable compounds include carboxyl group-containing monomers such as (meth)acrylic acid, carboxyethyl acrylate, carboxypentyl acrylate, itaconic acid, maleic acid, fumaric acid, crotonic acid, and isocrotonic acid.
  • Examples of monofunctional radically polymerizable compounds include lactam vinyl monomers such as N-vinylpyrrolidone, N-vinyl- ⁇ -caprolactam, and methylvinylpyrrolidone; vinylpyridine, vinylpiperidone, vinylpyrimidine, vinylpiperazine, vinylpyrazine, Vinyl-based monomers having a nitrogen-containing heterocyclic ring such as vinylpyrrole, vinylimidazole, vinyloxazole, and vinylmorpholine are included.
  • lactam vinyl monomers such as N-vinylpyrrolidone, N-vinyl- ⁇ -caprolactam, and methylvinylpyrrolidone
  • vinylpyridine vinylpiperidone
  • vinylpyrimidine vinylpiperazine
  • vinylpyrazine vinylpyrazine
  • Vinyl-based monomers having a nitrogen-containing heterocyclic ring such as vinylpyrrole, vinylimidazole, vinyloxazole, and vinylmorpholine are included.
  • a radically polymerizable compound having an active methylene group can be used as the monofunctional radically polymerizable compound.
  • a radically polymerizable compound having an active methylene group is a compound having an active double bond group such as a (meth)acrylic group at the end or in the molecule and an active methylene group.
  • Active methylene groups include, for example, an acetoacetyl group, an alkoxymalonyl group, a cyanoacetyl group, and the like.
  • the active methylene group is an acetoacetyl group.
  • radically polymerizable compounds having an active methylene group include 2-acetoacetoxyethyl (meth)acrylate, 2-acetoacetoxypropyl (meth)acrylate, 2-acetoacetoxy-1-methylethyl (meth)acrylate, and the like.
  • the radically polymerizable compound having an active methylene group is preferably acetoacetoxyalkyl (meth)acrylate.
  • polyfunctional radically polymerizable compounds having two or more polymerizable functional groups include tripropylene glycol di(meth)acrylate, tetraethylene glycol di(meth)acrylate, and 1,6-hexanediol di(meth)acrylate.
  • Aronix M-220 manufactured by Toagosei Co., Ltd.
  • light acrylate 1,9ND-A manufactured by Kyoeisha Chemical Co., Ltd.
  • light acrylate DGE-4A manufactured by Kyoeisha Chemical Co., Ltd.
  • light acrylate DCP-A manufactured by Sartomer
  • SR-531 manufactured by Sartomer
  • CD-536 manufactured by Sartomer
  • epoxy (meth)acrylates, urethane (meth)acrylates, polyester (meth)acrylates, various (meth)acrylate monomers, and the like can also be used as necessary.
  • the curable resin composition may contain an acrylic oligomer obtained by polymerizing a (meth)acrylic monomer in addition to the radically polymerizable compound.
  • an acrylic oligomer obtained by polymerizing a (meth)acrylic monomer in addition to the radically polymerizable compound.
  • an acrylic oligomer obtained by polymerizing a (meth)acrylic monomer should also have a low viscosity.
  • the acrylic oligomer which has a low viscosity and can prevent curing shrinkage of the adhesive layer preferably has a weight-average molecular weight (Mw) of 15,000 or less, more preferably 10,000 or less, and particularly 5,000 or less. preferable.
  • Mw weight-average molecular weight
  • the weight average molecular weight (Mw) of the acrylic oligomer is preferably 500 or more, more preferably 1000 or more.
  • the (meth)acrylic monomer constituting the acrylic oligomer include methyl (meth)acrylate, ethyl (meth)acrylate, n-propyl (meth)acrylate, isopropyl (meth)acrylate, 2-methyl- 2-nitropropyl (meth)acrylate, n-butyl (meth)acrylate, isobutyl (meth)acrylate, S-butyl (meth)acrylate, t-butyl (meth)acrylate, n-pentyl (meth)acrylate, t-pentyl (meth) acrylate, 3-pentyl (meth) acrylate, 2,2-dimethylbutyl (meth) acrylate, n-hexyl (meth) acrylate, cetyl (meth) acrylate, n-octyl (meth) acrylate, 2-ethylhexyl ( (Meth)acryl
  • acrylic oligomer (E) examples include "ARUFON” manufactured by Toagosei Co., Ltd., “ACT FLOW” manufactured by Soken Chemical Co., Ltd., and "JONCRYL” manufactured by BASF Japan.
  • the amount of the acrylic oligomer compounded is usually preferably 15 parts by mass or less with respect to 100 parts by mass of the total amount of the monomer components in the curable resin composition. If the content of the acrylic oligomer in the composition is too high, the reaction rate when the composition is irradiated with an active energy ray will decrease significantly, resulting in poor curing in some cases. On the other hand, in order to sufficiently suppress curing shrinkage of the adhesive layer, the composition preferably contains 3 parts by mass or more of an acrylic oligomer.
  • the curable resin composition preferably contains a photopolymerization initiator.
  • a photopolymerization initiator is appropriately selected depending on the active energy ray. When curing with ultraviolet light or visible light, a photopolymerization initiator that is cleaved with ultraviolet light or visible light is used.
  • photopolymerization initiator examples include benzophenone compounds such as benzyl, benzophenone, benzoylbenzoic acid, and 3,3′-dimethyl-4-methoxybenzophenone; 4-(2-hydroxyethoxy)phenyl(2-hydroxy-2 -propyl)ketone, ⁇ -hydroxy- ⁇ , ⁇ '-dimethylacetophenone, 2-methyl-2-hydroxypropiophenone, ⁇ -hydroxycyclohexylphenylketone and other aromatic ketone compounds; methoxyacetophenone, 2,2-dimethoxy- Acetophenone compounds such as 2-phenylacetophenone, 2,2-diethoxyacetophenone, 2-methyl-1-[4-(methylthio)-phenyl]-2-morpholinopropane-1; benzoin methyl ether, Benzoin ether compounds such as benzoin ethyl ether, benzoin isopropyl ether, benzoin butyl ether, and anisoin methyl ether
  • the blending amount of the photopolymerization initiator is 20 parts by mass or less with respect to 100 parts by mass of the total amount of the polymerizable compound A.
  • the blending amount of the photopolymerization initiator is preferably 0.01 to 20 parts by mass, more preferably 0.05 to 10 parts by mass, further preferably 0.1 to 5 parts by mass.
  • the curable resin composition when used as a visible light-curable type, it is preferable to use a photopolymerization initiator that is particularly sensitive to light of 380 nm or more.
  • a photopolymerization initiator highly sensitive to light of 380 nm or more will be described later.
  • the photopolymerization initiator a compound represented by the following general formula (1); (wherein R 1 and R 2 represent —H, —CH 2 CH 3 , —iPr or Cl, and R 1 and R 2 may be the same or different), or the general formula ( It is preferable to use the compound represented by 1) together with a photopolymerization initiator highly sensitive to light of 380 nm or longer, which will be described later.
  • the adhesiveness is superior to that when a photopolymerization initiator highly sensitive to light of 380 nm or more is used alone.
  • diethylthioxanthone in which R 1 and R 2 are —CH 2 CH 3 is particularly preferred.
  • the composition ratio of the compound represented by the general formula (1) in the curable resin composition is preferably 0.1 to 5% by mass, based on the total amount of the curable resin composition, and 0.5 to It is more preferably 4% by mass, and even more preferably 0.9 to 3% by mass.
  • polymerization initiation aids include triethylamine, diethylamine, N-methyldiethanolamine, ethanolamine, 4-dimethylaminobenzoic acid, methyl 4-dimethylaminobenzoate, ethyl 4-dimethylaminobenzoate, and isoamyl 4-dimethylaminobenzoate. and ethyl 4-dimethylaminobenzoate is particularly preferred.
  • the amount added is usually 0 to 5% by mass, preferably 0 to 4% by mass, most preferably 0 to 3% by mass, relative to the total amount of the curable resin composition. .
  • a known photopolymerization initiator can be used together as needed. Since the transparent protective film having UV absorbability does not transmit light of 380 nm or less, it is preferable to use a photopolymerization initiator that is highly sensitive to light of 380 nm or more.
  • 2-methyl-1-(4-methylthiophenyl)-2-morpholinopropan-1-one 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl)-butanone-1 , 2-(dimethylamino)-2-[(4-methylphenyl)methyl]-1-[4-(4-morpholinyl)phenyl]-1-butanone, 2,4,6-trimethylbenzoyl-diphenyl-phosphine oxide, bis(2,4,6-trimethylbenzoyl)-phenylphosphine oxide, bis( ⁇ 5-2,4-cyclopentadien-1-yl)-bis(2,6-difluoro-3-(1H-pyrrole- 1-yl)-phenyl) titanium and the like.
  • the curable resin composition preferably contains a silane coupling agent.
  • the silane coupling agent include vinyltrichlorosilane, vinyltrimethoxysilane, vinyltriethoxysilane, 2-(3,4 epoxycyclohexyl)ethyltrimethoxysilane, and 3-glycide as active energy ray-curable compounds.
  • xypropyltrimethoxysilane 3-glycidoxypropylmethyldiethoxysilane, 3-glycidoxypropyltriethoxysilane, p-styryltrimethoxysilane, 3-methacryloxypropylmethyldimethoxysilane, 3-methacryloxypropyltrimethoxysilane silane, 3-methacryloxypropylmethyldiethoxysilane, 3-methacryloxypropyltriethoxysilane, 3-acryloxypropyltrimethoxysilane, and the like.
  • the amount of the silane coupling agent is preferably in the range of 0.01 to 20% by mass, preferably 0.05 to 15% by mass, and 0.1 to 10% by mass with respect to the total amount of the adhesive composition. % is more preferred. This is because if the amount exceeds 20% by mass, the storage stability of the adhesive composition deteriorates, and if the amount is less than 0.1% by mass, the effect of adhesive water resistance is not sufficiently exhibited.
  • non-active energy ray-curable silane coupling agents other than the above include 3-ureidopropyltriethoxysilane, 3-chloropropyltrimethoxysilane, 3-mercaptopropylmethyldimethoxysilane, and 3-mercaptopropyltrimethoxysilane.
  • the curable resin composition if necessary, further contains a compound according to the following general formula (3);
  • R 6 and R 7 are each independently a hydrogen atom, an optionally substituted aliphatic hydrocarbon group, an aryl group, or a heterocyclic group represents), preferably a compound according to the general formula (3′);
  • the adhesive composition can be incorporated into the adhesive composition.
  • the adhesiveness to the polarizer and the transparent protective film may be improved, which is preferable.
  • the content of the compound represented by the general formula (3) in the curable water-dispersible composition is 0.001 to 50% by mass. preferably 0.1 to 30% by mass, most preferably 1 to 10% by mass.
  • the aliphatic hydrocarbon group is a linear or branched alkyl group which may have a substituent having 1 to 20 carbon atoms, and a substituent having 3 to 20 carbon atoms.
  • cyclic alkyl groups which may be substituted, and alkenyl groups having 2 to 20 carbon atoms. optionally substituted naphthyl groups and the like, and examples of heterocyclic groups include 5- or 6-membered ring groups containing at least one heteroatom and optionally having substituents. These may be linked together to form a ring.
  • R 6 and R 7 are preferably a hydrogen atom or a linear or branched alkyl group having 1 to 3 carbon atoms, most preferably a hydrogen atom.
  • X possessed by the compound represented by the general formula (3) is a functional group containing a reactive group, which is a functional group capable of reacting with the curable component constituting the adhesive layer, and the reactive group contained in X is is, for example, hydroxyl group, amino group, aldehyde group, carboxyl group, vinyl group, (meth)acryl group, styryl group, (meth)acrylamide group, vinyl ether group, epoxy group, oxetane group, ⁇ , ⁇ -unsaturated carbonyl groups, mercapto groups, halogen groups, and the like.
  • the reactive group contained in X is a vinyl group, a (meth)acryl group, a styryl group, a (meth)acrylamide group, a vinyl ether group, X is preferably at least one reactive group selected from the group consisting of an epoxy group, an oxetane group and a mercapto group, especially when the adhesive composition constituting the adhesive layer is radically polymerizable.
  • the reactive group is preferably at least one reactive group selected from the group consisting of a (meth)acryl group, a styryl group and a (meth)acrylamide group, and the compound represented by the general formula (1) is
  • the reactivity is high and the copolymerization rate with the active energy ray-curable resin composition is increased, which is more preferable.
  • the (meth)acrylamide group has a high polarity and is excellent in adhesiveness, so that the effect of the present invention can be efficiently obtained.
  • the reactive group contained in X is a hydroxyl group, an amino group, an aldehyde, a carboxyl group, a vinyl ether group, an epoxy group, an oxetane group, or a mercapto group. It is preferable to have at least one selected functional group, especially when it has an epoxy group, it is preferable for excellent adhesion between the resulting curable resin layer and the adherend, and when it has a vinyl ether group, the curable resin composition is preferred because of its excellent curability.
  • the compound represented by the general formula (3) may be one in which the reactive group and the boron atom are directly bonded.
  • the compound represented by is preferably one in which a reactive group and a boron atom are bonded via an organic group, that is, a compound represented by general formula (3′).
  • a compound represented by general formula (3) when the compound represented by the general formula (3) is bonded to a reactive group via an oxygen atom bonded to a boron atom, the adhesive water resistance of the polarizing film tends to deteriorate.
  • the compound represented by the general formula (3) does not have a boron-oxygen bond, but has a boron-carbon bond and contains a reactive group by bonding a boron atom and an organic group.
  • the organic group specifically means an organic group having 1 to 20 carbon atoms which may have a substituent, and more specifically, for example, having a substituent having 1 to 20 carbon atoms.
  • a naphthylene group which may have 20 substituents may be mentioned.
  • esters of hydroxyethylacrylamide and boric acid in addition to the compounds exemplified above, esters of hydroxyethylacrylamide and boric acid, esters of methylolacrylamide and boric acid, esters of hydroxyethyl acrylate and boric acid, and hydroxybutyl Esters of (meth)acrylates and boric acid can be exemplified, such as esters of acrylate and boric acid.
  • the cationically polymerizable compound used in the cationically polymerizable curable resin composition includes a monofunctional cationically polymerizable compound having one cationically polymerizable functional group in the molecule and two or more cationically polymerizable functional groups in the molecule. It is classified into polyfunctional cationic polymerizable compounds with Since the monofunctional cationically polymerizable compound has a relatively low liquid viscosity, the liquid viscosity can be reduced by including it in the cationically polymerizable curable resin composition. In addition, the monofunctional cationically polymerizable compound often has a functional group that exhibits various functions. Various functions can be expressed in the cured product of the curable resin composition.
  • the polyfunctional cationically polymerizable compound can three-dimensionally crosslink the cured product of the cationically polymerizable curable resin composition, it is preferably contained in the cationically polymerizable curable resin composition.
  • the ratio of the monofunctional cationically polymerizable compound to the polyfunctional cationically polymerizable compound is to mix 10 parts by mass to 1000 parts by mass of the polyfunctional cationically polymerizable compound with respect to 100 parts by mass of the monofunctional cationically polymerizable compound. is preferred.
  • Examples of cationic polymerizable functional groups include epoxy groups, oxetanyl groups, and vinyl ether groups.
  • Compounds having an epoxy group include aliphatic epoxy compounds, alicyclic epoxy compounds, and aromatic epoxy compounds. It is particularly preferred to contain an alicyclic epoxy compound.
  • Alicyclic epoxy compounds include 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexanecarboxylate, caprolactone-modified products of 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexanecarboxylate, and trimethylcaprolactone-modified products.
  • Compounds having an oxetanyl group improve the curability of the cationic polymerizable adhesive composition
  • Compounds having an oxetanyl group include 3-ethyl-3-hydroxymethyloxetane, 1,4-bis[(3-ethyl-3-oxetanyl ) methoxymethyl]benzene, 3-ethyl-3-(phenoxymethyl)oxetane, di[(3-ethyl-3-oxetanyl)methyl]ether, 3-ethyl-3-(2-ethylhexyloxymethyl)oxetane, phenol Aron oxetane OXT-101, Aron oxetane OXT-121, Aron oxetane OXT-211, Aron oxetane OXT-221, Aron oxetane OXT-212 (manufactured by Toagosei Co., Ltd.) and
  • a compound having a vinyl ether group has the effect of improving the curability of the cationic polymerizable adhesive composition and lowering the liquid viscosity of the composition, and is therefore preferably contained.
  • 2-hydroxyethyl vinyl ether diethylene glycol monovinyl ether, 4-hydroxybutyl vinyl ether, diethylene glycol monovinyl ether, triethylene glycol divinyl ether, cyclohexanedimethanol divinyl ether, cyclohexanedimethanol monovinyl ether, tricyclodecane vinyl ether, cyclohexyl vinyl ether, methoxyethyl vinyl ether , ethoxyethyl vinyl ether, pentaerythritol type tetravinyl ether, and the like.
  • the cationically polymerizable curable resin composition contains at least one compound selected from the epoxy group-containing compound, the oxetanyl group-containing compound, and the vinyl ether group-containing compound described above as a curable component.
  • a photo cationic polymerization initiator is blended because it is cured by This cationic photopolymerization initiator generates cationic species or Lewis acid upon irradiation with active energy rays such as visible light, ultraviolet rays, X-rays and electron beams, and initiates the polymerization reaction of epoxy groups and oxetanyl groups.
  • active energy rays such as visible light, ultraviolet rays, X-rays and electron beams
  • a photoacid generator described later is preferably used as the photocationic polymerization initiator.
  • a cationic photopolymerization initiator that is particularly sensitive to light of 380 nm or more. Since it is a compound that exhibits maximum absorption in a wavelength region near or shorter than 300 nm, by blending a photosensitizer that exhibits maximum absorption in a wavelength region longer than that, specifically, light with a wavelength longer than 380 nm, this It can respond to light of a wavelength in the vicinity and promote the generation of cationic species or acid from the photocationic polymerization initiator.
  • photosensitizers include anthracene compounds, pyrene compounds, carbonyl compounds, organic sulfur compounds, persulfides, redox compounds, azo and diazo compounds, halogen compounds, photoreducible dyes, and the like. You may use it in mixture of 2 or more types.
  • Anthracene compounds are particularly preferable because of their excellent photosensitizing effect, and specific examples thereof include Anthracure UVS-1331 and Anthracure UVS-1221 (manufactured by Kawasaki Kasei Co., Ltd.).
  • the content of the photosensitizer is preferably 0.1% by mass to 5% by mass, more preferably 0.5% by mass to 3% by mass.
  • the polarizing film according to the present invention is produced by, for example, the following production method; A polarizer manufacturing step of manufacturing a polarizer in which a non-polarizing portion having a concave portion on one side is formed by treating a predetermined position on one surface of the polarizer with a treatment liquid, and the polarizer has the concave portion.
  • It can be manufactured by a method for manufacturing a polarizing film.
  • the polarizer manufacturing process includes a first step of temporarily attaching a surface protective film having through holes to one surface of the polarizer to form a polarizing film laminate, and through the through holes of the surface protective film.
  • the method of applying the curable resin composition to the surface of the polarizer having recesses is appropriately selected depending on the viscosity of the composition and the desired thickness. Therefore, it is preferable to use the post-metering coating method.
  • Specific examples of the post-metering coating method include gravure roll coating, forward roll coating, air knife coating, and rod/bar coating. Among these, the gravure roll coating method is particularly preferable from the viewpoint of the removal of foreign substances on the surface of the transparent protective film and the coatability.
  • an easy-adhesive composition may be coated on the adhesive composition-coated surface of the polarizer.
  • a method for applying the easy-adhesive composition to the bonding surface of the polarizer it is preferable to use a post-metering coating method because the same effects as in the coating step are obtained.
  • the easy-adhesion composition contains the compound represented by the general formula (3), the adhesive strength between the polarizer and the transparent protective film is increased, which is preferable.
  • the pattern formed on the surface of the gravure roll is preferably a honeycomb mesh pattern.
  • the cell volume is preferably 1 to 5 cm 3 /m 2 , more preferably 2 to 3 cm 3 /m 2 in order to increase the surface precision of the coated surface after the easy-adhesion composition is applied. is preferred.
  • the number of cell lines per inch of the roll is preferably 200 to 3000 lines/inch in order to improve the surface precision of the coated surface after coating with the easy-adhesive composition. Further, it is preferable that the rotation speed ratio of the gravure roll to the traveling speed of the polarizer is 100 to 300%.
  • the polarizer and the transparent protective film are bonded together via the curable resin composition coated as described above.
  • the bonding of the polarizer and the transparent protective film can be performed using a roll laminator or the like.
  • the polarizer and the transparent protective film After bonding the polarizer and the transparent protective film together, they are irradiated with active energy rays (electron beams, ultraviolet rays, visible rays, etc.) to cure the curable resin composition and form an adhesive layer.
  • active energy rays electron beams, ultraviolet rays, visible rays, etc.
  • the irradiation direction of the active energy rays can be any suitable direction.
  • irradiation is performed from the transparent protective film side.
  • the polarizer may be deteriorated by active energy rays (electron beams, ultraviolet rays, visible rays, etc.).
  • electron beam irradiation preferably has an acceleration voltage of 5 kV to 300 kV, more preferably 10 kV to 250 kV. If the acceleration voltage is less than 5 kV, the electron beam may not reach the adhesive, resulting in insufficient curing. may give The irradiation dose is 5 to 100 kGy, more preferably 10 to 75 kGy.
  • the adhesive will be insufficiently cured, and if it exceeds 100 kGy, the transparent protective film and polarizer will be damaged, the mechanical strength will decrease and yellowing will occur, and the desired optical properties will not be obtained.
  • Electron beam irradiation is usually carried out in an inert gas, but if necessary, it may be carried out in the air or with a small amount of oxygen introduced. Although it depends on the material of the transparent protective film, by appropriately introducing oxygen, the surface of the transparent protective film that is exposed to the electron beam first is intentionally inhibited by oxygen, and damage to the transparent protective film can be prevented. Efficient electron beam irradiation can be achieved.
  • an active energy ray containing visible light with a wavelength range of 380 nm to 450 nm particularly an active energy ray with the highest irradiation amount of visible light with a wavelength range of 380 nm to 450 nm.
  • ultraviolet rays and visible rays when using a transparent protective film imparted with ultraviolet absorption ability (ultraviolet-impermeable transparent protective film), it absorbs light with a wavelength shorter than about 380 nm. Light of that wavelength does not reach the adhesive composition and does not contribute to its polymerization reaction.
  • the transparent protective film Furthermore, light with a wavelength shorter than 380 nm absorbed by the transparent protective film is converted into heat, and the transparent protective film itself generates heat, causing defects such as curling and wrinkling of the polarizing film. Therefore, when ultraviolet light and visible light are used in the present invention, it is preferable to use a device that does not emit light with a wavelength shorter than 380 nm as an active energy ray generator, and more specifically, an integrated wavelength range of 380 to 440 nm.
  • the ratio of illuminance to integrated illuminance in the wavelength range of 250 to 370 nm is preferably 100:0 to 100:50, more preferably 100:0 to 100:40.
  • a gallium-encapsulated metal halide lamp and an LED light source emitting light in a wavelength range of 380 to 440 nm are preferable as active energy rays.
  • a light source containing visible light can be used, and a band-pass filter can be used to cut off ultraviolet light with a wavelength shorter than 380 nm.
  • a gallium-filled metal halide lamp is used, and light with a wavelength shorter than 380 nm can be blocked. It is preferable to use an active energy ray obtained through a bandpass filter or an active energy ray with a wavelength of 405 nm obtained using an LED light source.
  • the temperature is preferably 40°C or higher, more preferably 50°C or higher.
  • the active energy ray-curable adhesive composition after irradiation with ultraviolet light or visible light (post-irradiation heating). Warming is more preferred.
  • the polarizing film of the present invention can be used as an optical film laminated with other optical layers in practical use.
  • the optical layer is not particularly limited.
  • One or more optical layers may be used.
  • a reflective polarizing film or a semi-transmissive polarizing film obtained by further laminating a reflector or a semi-transmitting reflector on the polarizing film of the present invention an elliptical polarizing film or circularly polarized light obtained by further laminating a retardation plate on the polarizing film A film, a wide viewing angle polarizing film obtained by further laminating a viewing angle compensation film on a polarizing film, or a polarizing film obtained by further laminating a brightness enhancement film on a polarizing film are preferable.
  • the optical film obtained by laminating the above optical layer on the polarizing film can be formed by a method of sequentially and separately laminating in the manufacturing process of an image display device or the like. It is excellent in stability and assembly work, and has the advantage of being able to improve the manufacturing process of image display devices and the like.
  • Appropriate adhesive means such as an adhesive layer can be used for lamination.
  • the above-mentioned polarizing film and optical film laminated with at least one layer of polarizing film can also be provided with an adhesive layer for adhering to other members such as liquid crystal cells.
  • the pressure-sensitive adhesive that forms the pressure-sensitive adhesive layer is not particularly limited, but for example, an acrylic polymer, silicone-based polymer, polyester, polyurethane, polyamide, polyether, fluorine-based polymer, rubber-based polymer, or the like is appropriately selected. can be used as In particular, those having excellent optical transparency, suitable wettability, cohesiveness, and adhesive properties such as acrylic pressure-sensitive adhesives, and excellent weather resistance and heat resistance can be preferably used.
  • the adhesive layer can also be provided on one or both sides of the polarizing film or optical film as a superimposed layer of different compositions or types. Further, when the adhesive layer is provided on both sides, the front and back surfaces of the polarizing film or the optical film may have adhesive layers with different compositions, types, thicknesses, and the like.
  • the thickness of the adhesive layer can be appropriately determined according to the purpose of use, adhesive strength, etc., and is generally 1 to 100 ⁇ m, preferably 5 to 30 ⁇ m, particularly preferably 10 to 20 ⁇ m.
  • the exposed surface of the adhesive layer is temporarily covered with a separator for the purpose of preventing contamination until it is put into practical use. This prevents contact with the adhesive layer during normal handling conditions.
  • a separator excluding the above thickness conditions, suitable thin sheets such as plastic films, rubber sheets, paper, cloth, non-woven fabrics, nets, foam sheets, metal foils, and laminates thereof may be used.
  • An appropriate release agent according to the prior art such as one coated with an appropriate release agent such as chain alkyl, fluorine, or molybdenum sulfide, can be used.
  • the polarizing film of the present invention can be preferably used for forming various devices such as image display devices. Formation of the image display device can be carried out according to the conventional method. That is, an image display device is generally formed by appropriately assembling components such as a liquid crystal cell, a polarizing film or an optical film, and an illumination system as necessary, and incorporating a driving circuit. There is no particular limitation except that the polarizing film or optical film according to the invention is used, and conventional methods can be applied. As for the liquid crystal cell, any type such as TN type, STN type, or ⁇ type can be used.
  • Appropriate image display devices can be formed, such as an image display device in which a polarizing film or an optical film is arranged on one or both sides of a liquid crystal cell, or a device using a backlight or a reflector in an illumination system.
  • the polarizing film or optical film according to the present invention can be placed on one side or both sides of the liquid crystal cell.
  • polarizing films or optical films are provided on both sides, they may be the same or different.
  • appropriate parts such as a diffusion plate, an anti-glare layer, an antireflection film, a protection plate, a prism array, a lens array sheet, a light diffusion plate, a backlight, etc. Two or more layers can be arranged.
  • examples of the image display device of the present invention include an organic EL (electroluminescence) display device, a PDP (plasma display panel), an electronic paper, and the like. be done.
  • the application of the image display device it can be preferably applied to the application that requires a member that is required to have durability characteristics in a high humidity and heat environment, such as a foldable display device and a vehicle display device.
  • the polarizing film according to the present invention has a non-polarizing portion formed on the polarizer, it can be suitably used particularly for an image display device having a sensor function. placed in corresponding positions.
  • IPA-copolymerized PET polyethylene terephthalate
  • Tg Tg of 75° C.
  • One side of the substrate was subjected to corona treatment, and the corona-treated side was coated with polyvinyl alcohol (degree of polymerization: 4,200, degree of saponification: 99.2 mol%) and acetoacetyl-modified PVA (degree of polymerization: 1,200, degree of acetoacetyl modification: 4.6).
  • a PVA-based resin layer was formed to produce a laminate.
  • the resulting laminate was uniaxially stretched 2.4 times at the free end in the machine direction (longitudinal direction) between rolls with different peripheral speeds in an oven at 120°C (in-air auxiliary stretching).
  • the laminate was immersed in an insolubilizing bath (an aqueous boric acid solution obtained by blending 4 parts by mass of boric acid with 100 parts by mass of water) at a liquid temperature of 30° C. for 30 seconds (insolubilizing treatment).
  • insolubilizing treatment an aqueous boric acid solution obtained by blending 4 parts by mass of boric acid with 100 parts by mass of water
  • it was immersed in a dyeing bath at a liquid temperature of 30° C. while adjusting the iodine concentration and the immersion time so that the polarizing plate had a predetermined transmittance.
  • iodine 0.2 parts by mass of iodine was blended with 100 parts by mass of water, and 1.5 parts by mass of potassium iodide was blended and immersed for 60 seconds in an aqueous iodine solution (dyeing treatment). .
  • it was immersed for 30 seconds in a cross-linking bath at a liquid temperature of 30°C (an aqueous solution of boric acid obtained by blending 3 parts by mass of potassium iodide and 3 parts by mass of boric acid with respect to 100 parts by mass of water). (crosslinking treatment).
  • the laminate is immersed in an aqueous solution of boric acid at a liquid temperature of 70° C.
  • a radically polymerizable curable resin composition is applied to the second transparent protective film, the PVA-based resin layer surface of the laminate obtained above and the second transparent protective film are bonded together, and the second transparent protective film is The adhesive was cured by irradiating the following ultraviolet rays from the film side.
  • the substrate was peeled off from the PVA-based resin layer to obtain a long polarizing film (polarizer/second transparent protective film) having a width of about 1300 mm.
  • the polarizer had a thickness of 5 ⁇ m and a single transmittance of 40.8%.
  • ultraviolet rays As an active energy ray, ultraviolet rays (gallium-filled metal halide lamp, irradiation device: Light HAMMER10 manufactured by Fusion UV Systems, Inc., bulb: V bulb, peak illuminance: 1600 mW/cm 2 , cumulative irradiation amount 1000/mJ/cm 2 (wavelength 380-440 nm)) was used. The UV illuminance was measured using a Sola-Check system manufactured by Solatell.
  • An adhesive (acrylic adhesive) was applied to one side of an ester resin film (thickness: 38 ⁇ m) with a width of about 1,300 mm so that the thickness would be 5 ⁇ m.
  • Through-holes having a diameter of 2.8 mm were formed in this adhesive-attached ester resin film at intervals of 250 mm in the longitudinal direction and at intervals of 400 mm in the width direction using a Pycnal blade.
  • the adhesive-attached ester resin film was laminated by roll-to-roll.
  • a polarizing film having a polarizer in which a non-polarizing portion having different thickness and hardness is formed is obtained. manufactured.
  • NaOH treatment time is the time (seconds) during which the polarizing film was immersed in a 1 mol/L (1N) sodium hydroxide aqueous solution
  • HCl treatment time is 1 mol/ The time (seconds) during which the polarizing film was immersed in L (1N) hydrochloric acid
  • drying temperature means the drying temperature (°C) after NaOH treatment and HCl treatment.
  • the ester-based resin film was peeled off from the laminate obtained above. Subsequently, in Examples 5 and 7 to 8, before bonding the release surface of the ester resin film of the laminate to the first transparent protective film, a gravure roll coating method equipped with a gravure roll was used. Easy adhesion composition 1 (70% by weight of ACMO, 27.8% by weight of pure water, 2% by weight of VBPA, 0.2% by weight of EXP42000) was applied to the release surface (coating thickness: 1 ⁇ m) and air-dried at 25° C. for 1 minute. (Thickness after drying: 0.7 ⁇ m).
  • Example 1-8 adhesive compositions 1 to 6 were applied to the bonding surface of an acrylic resin film (thickness 40 ⁇ m) as the first transparent protective film, and UV rays were irradiated in the same manner as above. to cure the adhesive.
  • Table 2 shows the thickness of the adhesive layer after curing.
  • the configurations of adhesive compositions 1 to 6 are shown in Table 1.
  • an adhesive composition 7 (Nippon Gosei Kagaku Kogyo Co., Ltd., product name "Gosefimer Z-200", PVA-based resin aqueous solution with a resin concentration of 5% by weight and a water content of 95% by weight) is applied, and bonded to the release surface of the ester-based resin film. Heated in an oven maintained at °C for 5 minutes. The viscosity of the adhesive composition before curing was 10 mPa ⁇ s.
  • ACMO acryloylmorpholine
  • ACMO acryloylmorpholine
  • ACMO 1,9-NDA (1,9-nonanediol diacrylate) manufactured by KJ Chemicals
  • Light acrylate 1,9ND-A P2H manufactured by Kyoeisha Chemical Co., Ltd.
  • -A phenoxydiethylene glycol acrylate
  • P2H-A Kyoeisha Chemical Co., Ltd.
  • HEAA hydroxyethyl acrylamide
  • HEAA BYK UV3505 (UV curable surface conditioner) manufactured by Kojin Co., Ltd.
  • BYK UV3505" manufactured by BYK Chemie Japan Omn907 (2-methyl-1-[4-(methylthio)phenyl]-2-morpholinopropan-1-one
  • Omnirad 907 manufactured by IGMresins Omn819 (bis (2,4,6-trimethylbenzoyl) phenylphosphine oxide
  • trade name "Omnirad 819 manufactured by IGM resins DETX (diethylthioxanthone); trade name "KAYACURE DETX-S", manufactured by Nippon Kayaku Co., Ltd.
  • UP-1190 (acrylic oligomer obtained by polymerizing (meth)acrylic monomer); trade name “ARUFON UP1190”, Toagosei Co., Ltd. VPBA (4-vinylphenylboronic acid); trade name “4-vinylphenylboronic acid” , HPAA (hydroxypivalic acid didiacrylate) manufactured by Tokyo Chemical Industry Co., Ltd.; trade name "Light Acrylate HPPA", Kyoeisha Chemical Co., Ltd. M5700 (2-hydroxy-3-phenoxypropyl acrylate); trade name "Aronix M5700", Toagosei Co., Ltd.
  • DEAA diethylacrylamide
  • DEAA diethylacrylamide
  • DEA solvent-free fatty acid hydroxyalkyl ester-modified ⁇ -caprolactone (monomer component having a hydroxyl group)
  • PVAXEL FA1DDM Daicel 9EGA (PEG400# diacrylate)
  • EXP4200 leveling agent
  • trade name “Olfine EXP.4200 Nissin Chemical Industry Co., Ltd.
  • a polarizing film having a configuration of the first transparent protective film/polarizer was produced as described above.
  • the first transparent protective film corresponds to the transparent protective film 3 constituting the polarizing film 10 shown in FIG. 1
  • the polarizer corresponds to the polarizer 1 constituting the polarizing film 10 shown in FIG.
  • the adhesive layer that adheres the protective film and the polarizer corresponds to the adhesive layer 2 that constitutes the polarizing film 10 shown in FIG.
  • the second transparent protective film was used in this example, a retardation film may be used instead.
  • Table 2 shows the thickness of the obtained polarizing film and the measurement results of each physical property.
  • the thickness d1 ( ⁇ m) of the non-polarizing portion of the polarizer and the thickness d2 ( ⁇ m) of the portion in contact with the concave portion of the adhesive layer were measured using a scanning electron microscope (manufactured by ZYGO, product name "New View 7300 ”).
  • the thickness d3 ( ⁇ m) of the first transparent protective film was measured using a digital micrometer (manufactured by Anritsu Co., Ltd., product name "KC-351C").
  • the stress relaxation rate (%) was calculated by measuring the load 40 seconds after indenting the indenter by 50 nm into each part of the polarizing film to be measured, and comparing it with the load at the initial stage of indentation.
  • the irradiation conditions for the CO 2 laser are as follows. (Irradiation conditions) Wavelength: 10.6 ⁇ m Laser output: 30W Oscillation mode: Pulse oscillation Diameter of laser beam: 70 ⁇ m Laser irradiation surface: Protective film side
  • ⁇ Curl evaluation of polarizing film> A sample of 100 mm ⁇ 150 mm was cut out so that the long side of the polarizing film was in the stretching direction. The sample was placed on a horizontal plane with the convex surface facing down, and the distances from the horizontal plane to four ends of the sample were measured. At this time, when the average value of the four locations is less than 20 mm, the polarizing film is sufficiently suppressed from curling ( ⁇ ), and when the average value of the four locations is 20 mm to 30 mm, the polarizing film is at a practical level ( ⁇ ). .

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Nonlinear Science (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Mathematical Physics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Polarising Elements (AREA)

Abstract

L'invention concerne un film polarisant dans lequel un film de protection transparent est stratifié sur au moins une des faces d'un polariseur avec une couche d'adhésif pour intermédiaire. Une partie non polarisante possédant une partie en creux est formée sur une des faces du polariseur. Lorsque la dureté de la partie non polarisante est représentée par Ｈ１（ＧＰａ）et l'épaisseur de sa portion la plus fine est représentée par ｄ１（μｍ）, et que la dureté de la portion de la couche d'adhésif en contact avec ladite partie en creux est représentée par Ｈ２（ＧＰａ）et l'épaisseur de sa portion la plus épaisse est représentée par ｄ２（μｍ）, alors le polariseur est conçu de sorte que Ｈ２×（ｄ２／ｄ１）≧０,０１.
PCT/JP2022/025523 2021-06-30 2022-06-27 Film polarisant, et dispositif d'affichage d'image WO2023276931A1 (fr)

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JP2017194568A (ja) * 2016-04-20 2017-10-26 日東電工株式会社 偏光板およびその製造方法、ならびに該偏光板を用いた画像表示装置
JP2018028563A (ja) * 2016-08-15 2018-02-22 日東電工株式会社 偏光板およびその製造方法、ならびに該偏光板を用いた画像表示装置
JP2018031954A (ja) * 2016-08-26 2018-03-01 日東電工株式会社 偏光板およびその製造方法、ならびに該偏光板を用いた画像表示装置
JP2018072545A (ja) * 2016-10-28 2018-05-10 日東電工株式会社 偏光子およびその製造方法
JP2018156010A (ja) * 2017-03-21 2018-10-04 日東電工株式会社 偏光子の製造方法

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KR20150086159A (ko) 2014-01-17 2015-07-27 주식회사 엘지화학 국지적으로 편광 해소 영역을 갖는 편광자 제조 방법, 이를 이용하여 제조된 편광자 및 편광판
JP6214594B2 (ja) 2014-04-25 2017-10-18 日東電工株式会社 偏光子、偏光板および画像表示装置

Patent Citations (5)

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Publication number Priority date Publication date Assignee Title
JP2017194568A (ja) * 2016-04-20 2017-10-26 日東電工株式会社 偏光板およびその製造方法、ならびに該偏光板を用いた画像表示装置
JP2018028563A (ja) * 2016-08-15 2018-02-22 日東電工株式会社 偏光板およびその製造方法、ならびに該偏光板を用いた画像表示装置
JP2018031954A (ja) * 2016-08-26 2018-03-01 日東電工株式会社 偏光板およびその製造方法、ならびに該偏光板を用いた画像表示装置
JP2018072545A (ja) * 2016-10-28 2018-05-10 日東電工株式会社 偏光子およびその製造方法
JP2018156010A (ja) * 2017-03-21 2018-10-04 日東電工株式会社 偏光子の製造方法

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