WO2021215385A1 - 偏光フィルム、積層偏光フィルム、画像表示パネル、および画像表示装置 - Google Patents

偏光フィルム、積層偏光フィルム、画像表示パネル、および画像表示装置 Download PDF

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WO2021215385A1
WO2021215385A1 PCT/JP2021/015834 JP2021015834W WO2021215385A1 WO 2021215385 A1 WO2021215385 A1 WO 2021215385A1 JP 2021015834 W JP2021015834 W JP 2021015834W WO 2021215385 A1 WO2021215385 A1 WO 2021215385A1
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Prior art keywords
polarizing film
image display
layer
film
functional layer
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PCT/JP2021/015834
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English (en)
French (fr)
Japanese (ja)
Inventor
かおる ▲黒▼原
山下　智弘
拓馬 黒田
汐海 八木
勝則 高田
卓哉 湯峯
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日東電工株式会社
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Priority to KR1020227021647A priority Critical patent/KR20230002270A/ko
Priority to CN202180029484.0A priority patent/CN115427850A/zh
Publication of WO2021215385A1 publication Critical patent/WO2021215385A1/ja

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    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80—Constructional details
    • H10K59/8791—Arrangements for improving contrast, e.g. preventing reflection of ambient light
    • 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
    • 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
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00—Electroluminescent light sources
    • H05B33/02—Details

Definitions

  • the present invention relates to a polarizing film, a laminated polarizing film, an image display panel, and an image display device.
  • a polarizing film used in various image display devices such as a liquid crystal display device and an organic EL display device has high transmittance and high polarization degree, and thus has been dyed (such as iodine and dichroic dyes).
  • a polyvinyl alcohol-based film (containing a dichroic substance) is used.
  • the polarizing film is produced by subjecting a polyvinyl alcohol-based film to various treatments such as swelling, dyeing, cross-linking, and stretching in a bath, washing treatment, and then drying. Further, the polarizing film is usually used as a polarizing film (polarizing plate) in which a protective film such as triacetyl cellulose is bonded to one side or both sides thereof using an adhesive.
  • the above-mentioned various image display devices usually include an image display cell such as a liquid crystal cell or an organic EL element, a viewing side polarizing film arranged on the viewing side of the image display cell, and a side opposite to the viewing side of the image display cell.
  • a backside polarizing film arranged on the (backlight side) is provided (Patent Document 1-2). Further, the polarizing film is used as a laminated polarizing film (optical laminate) by laminating other optical layers as needed, and further, the polarizing film or the laminated polarizing film (optical laminate) is described above. It is used as an image display panel attached to an image display cell (Patent Document 3).
  • an object of the present invention is to provide a polarizing film having an excellent effect of suppressing a decrease in simple substance transmittance in a high temperature environment.
  • Another object of the present invention is to provide a laminated polarizing film using the above-mentioned polarizing film, an image display panel, and an image display device.
  • the present invention is a polarizing film constituting an image display device having an image display cell, and the polarizing film has a polarizing film, a functional layer, an adhesive layer, and a first transparent protective film.
  • the functional layer is adjacent to the image display cell side of the polarizing film and contains a water-soluble radical trapping agent, and the first transparent protective film is attached to the functional layer via an adhesive layer.
  • the polarizing film provided.
  • the present invention also relates to a laminated polarizing film in which the polarizing film is bonded to an optical layer.
  • the present invention also relates to an image display cell and an image display panel having the polarizing film or the laminated polarizing film.
  • the present invention also relates to the image display panel and an image display device having a front transparent member.
  • the polarizing film of the present invention is a polarizing film constituting an image display device having an image display cell, and the polarizing film has a polarizing film, a functional layer, an adhesive layer, and a first transparent protective film.
  • the functional layer is adjacent to the image display cell side of the polarizing film and contains a water-soluble radical trapping agent, and the first transparent protective film is attached to the functional layer via an adhesive layer. It is provided.
  • the moisture in the polarizing film is not easily released to the outside of the system during heating, the residual moisture accelerates the deterioration of the polarizing film, so that the polarizing film is transmitted alone.
  • the water-soluble radical scavenger contained in the functional layer adjacent to the cell side of the polarizing film is easily transferred to the water content in the polarizing film, and is generated due to the progress of polyene formation. Since the possible radicals can be captured, the decrease in the single transmittance (polyene formation) from the cell side of the polarizing film can be efficiently suppressed, so that the effect of suppressing the decrease in the single transmittance in a high temperature environment is excellent.
  • FIG. 1 is a schematic cross-sectional view showing a form of the image display device of the present invention.
  • the aspect is shown.
  • FIG. 1 is a schematic cross-sectional view showing a form of the image display device of the present invention.
  • FIG. 1 one of the image display panels in which the image display cell side of the polarizing film of the polarizing film (visualizing side polarizing film) 10 (a) is bonded to the image display cell 90 via the adhesive layer or the adhesive layer 50.
  • the aspect is shown.
  • FIG. 1 shows an aspect of an image display device 100 provided with a front transparent member 80 on the polarizing film (visualizing side polarizing film) 10 (a) side of the image display panel.
  • a backlight unit (not shown) is arranged on the opposite side of the polarizing film (backside polarizing film) 10 (b) from the image display cell side of the polarizing film.
  • FIG. 2 is a schematic cross-sectional view showing a form of the polarizing film (viewing side polarizing film) of the present invention.
  • the functional layer 12 is adjacent to the image display cell side of the polarizing film 11
  • the first transparent protective film 13 is a polarizing film provided on the functional layer 12 via an adhesive layer 20.
  • An aspect of 10 (a) is shown.
  • FIG. 3 is a schematic cross-sectional view showing a form of the polarizing film (viewing side polarizing film) of the present invention.
  • the functional layer 12 is adjacent to the image display cell side of the polarizing film 11, and the first transparent protective film 13 is provided on the functional layer 12 via the adhesive layer 20.
  • FIG. 4 is a schematic cross-sectional view showing one form of the polarizing film (backside polarizing film) of the present invention.
  • the functional layer 12 is adjacent to the image display cell side of the polarizing film 11, and the first transparent protective film 13 is a polarizing film provided on the functional layer 12 via an adhesive layer 20.
  • An aspect of 10 (b) is shown.
  • FIG. 5 is a schematic cross-sectional view showing one form of the polarizing film (backside polarizing film) of the present invention.
  • the functional layer 12 is adjacent to the image display cell side of the polarizing film 11, and the first transparent protective film 13 is provided on the functional layer 12 via the adhesive layer 20.
  • One of the polarizing films 10 (b) provided with a second transparent protective film 14 via an adhesive layer or an adhesive layer 30 on the opposite side (backlight side) of the polarizing film 11 on the image display cell side. The aspect is shown.
  • the polarizing film of the present invention is a polarizing film constituting an image display device having an image display cell, and the polarizing film has a polarizing film, a functional layer, an adhesive layer, and a first transparent protective film.
  • the functional layer is adjacent to the image display cell side of the polarizing film and contains a water-soluble radical trapping agent, and the first transparent protective film is attached to the functional layer via an adhesive layer. It is provided.
  • the polarizing film may be either a viewing-side polarizing film arranged on the viewing side of the image display cell or a back-side polarizing film arranged on the side opposite to the viewing side (backlight side) of the image display cell. good.
  • the viewing side polarizing film and the back side polarizing film may be the same or different.
  • the polarizing film of the present invention is formed by adsorbing and orienting a dichroic substance such as iodine or a dichroic dye on a polyvinyl alcohol-based film. From the viewpoint of the initial polarization performance of the polarizing film, iodine is preferable as the dichroic substance.
  • the polyvinyl alcohol (PVA) -based film has translucency in the visible light region, and can be used without particular limitation if it disperses and adsorbs a dichroic substance such as iodine or a dichroic dye. Further, the PVA-based film usually used as a raw material preferably has a thickness of about 1 to 100 ⁇ m, more preferably about 1 to 50 ⁇ m, and preferably a width of about 100 to 5000 mm.
  • Examples of the material of the polyvinyl alcohol-based film include polyvinyl alcohol or a derivative thereof.
  • the polyvinyl alcohol derivative include polyvinyl formal, polyvinyl acetal; olefins such as ethylene and propylene; unsaturated carboxylic acids such as acrylic acid, methacrylic acid and crotonic acid, and alkyl esters and acrylamides thereof. Can be mentioned.
  • the polyvinyl alcohol preferably has an average degree of polymerization of about 100 to 10,000, more preferably about 1,000 to 10,000, and even more preferably about 1,500 to 4,500. ..
  • the polyvinyl alcohol preferably has a saponification degree of about 80 to 100 mol%, more preferably about 95 mol% to 99.95 mol.
  • the average degree of polymerization and the saponification degree can be determined according to JIS K 6726.
  • the polyvinyl alcohol-based film may contain additives such as a plasticizer and a surfactant.
  • the plasticizer include polyols such as glycerin, diglycerin, triglycerin, ethylene glycol, propylene glycol, and polyethylene glycol, and condensates thereof.
  • the amount of the additive used is not particularly limited, but is preferably about 20% by weight or less in the polyvinyl alcohol-based film, for example.
  • the polarizing film is produced by, for example, dyeing the polyvinyl alcohol-based film by immersing it in an aqueous solution of a dichroic substance such as iodine or a dichroic dye, and stretching the film to 3 to 7 times the original length. Can be done. If necessary, it can be immersed in an aqueous solution such as boric acid or potassium iodide. Further, if necessary, the polyvinyl alcohol-based film may be immersed in water and washed with water before dyeing.
  • a dichroic substance such as iodine or a dichroic dye
  • Stretching may be performed after dyeing with iodine, stretching while dyeing, or stretching and then dyeing with iodine. It can be stretched in an aqueous solution such as boric acid or potassium iodide or in a water bath.
  • the thickness of the polarizing film is preferably 1 ⁇ m or more, more preferably 2 ⁇ m or more, and 15 ⁇ m or less from the viewpoint of preventing warpage of the panel, from the viewpoint of improving the initial degree of polarization of the polarizing film. It is more preferably 10 ⁇ m or less, and even more preferably 8 ⁇ m or less.
  • a laminate containing a polyvinyl alcohol-based resin layer formed on a thermoplastic resin base material is used as the polyvinyl alcohol-based film, and the following thin type is used.
  • a method for producing a polarizing film can be applied.
  • the method for producing a thin polarizing film is to form a polyvinyl alcohol-based resin layer (PVA-based resin layer) containing a polyvinyl alcohol-based resin (PVA-based resin) on one side of a long thermoplastic resin base material to form a laminate.
  • a two-stage stretching method that combines an aerial auxiliary stretching treatment (dry stretching) and an underwater stretching treatment in a boric acid aqueous solution is selected.
  • any suitable method is adopted as the method for producing the laminate.
  • a method of applying a coating liquid containing the PVA-based resin to the surface of the thermoplastic resin base material and drying the laminate can be mentioned. Be done.
  • the thickness of the thermoplastic resin base material is preferably about 20 to 300 ⁇ m, more preferably about 50 to 200 ⁇ m.
  • the thickness of the PVA-based resin layer is preferably about 3 to 40 ⁇ m, more preferably about 3 to 20 ⁇ m.
  • the thermoplastic resin base material preferably has a water absorption rate of about 0.2% or more, preferably 0.3, from the viewpoint of absorbing water, significantly reducing the stretching stress, and being able to stretch at a high magnification. More preferably, it is about% or more.
  • the thermoplastic resin base material has a water absorption rate of 3 from the viewpoint that the dimensional stability of the thermoplastic resin base material is remarkably lowered and problems such as deterioration of the appearance of the obtained polarizing film can be prevented. It is preferably about% or less, and more preferably about 1% or less.
  • the water absorption rate can be adjusted, for example, by introducing a modifying group into the constituent material of the thermoplastic resin base material.
  • the water absorption rate is a value obtained according to JIS K 7209.
  • the thermoplastic resin base material has a glass transition temperature (Tg) of about 120 ° C. or less from the viewpoint of being able to sufficiently secure the stretchability of the laminate while suppressing the crystallization of the PVA-based resin layer. Is preferable. Further, considering the plasticization of the thermoplastic resin base material with water and the good stretching in water, the glass transition temperature (Tg) is more preferably about 100 ° C. or lower, more preferably about 90 ° C. or lower. Is even more preferable. On the other hand, the glass transition temperature of the thermoplastic resin base material is a viewpoint that a good laminate can be produced by preventing problems such as deformation of the thermoplastic resin base material when the coating liquid is applied and dried. Therefore, it is preferably about 60 ° C. or higher. The glass transition temperature can be adjusted, for example, by introducing a modifying group into the constituent material of the thermoplastic resin base material or heating with a crystallization material. The glass transition temperature (Tg) is a value obtained according to JIS K7121.
  • thermoplastic resin can be adopted as the constituent material of the thermoplastic resin base material.
  • the thermoplastic resin include ester resins such as polyethylene terephthalate resins, cycloolefin resins such as norbornene resins, olefin resins such as polypropylene, polyamide resins, polycarbonate resins, and copolymer resins thereof. And so on.
  • norbornene-based resin and amorphous (amorphous) polyethylene terephthalate-based resin are preferable, and further, the thermoplastic resin base material is extremely excellent in stretchability and crystallization during stretching can be suppressed.
  • Amorphous (amorphous) polyethylene terephthalate resin is preferably used.
  • amorphous (amorphous) polyethylene terephthalate resin examples include a copolymer containing isophthalic acid and / or cyclohexanedicarboxylic acid as a dicarboxylic acid, and a copolymer containing cyclohexanedimethanol or diethylene glycol as a glycol.
  • the thermoplastic resin base material may be surface-treated (for example, corona treatment or the like) before forming the PVA-based resin layer, or the easy-adhesion layer may be formed on the thermoplastic resin base material. .. By performing such a treatment, the adhesion between the thermoplastic resin base material and the PVA-based resin layer can be improved. Further, the thermoplastic resin base material may be stretched before forming the PVA-based resin layer.
  • the coating liquid is a solution in which a PVA-based resin is dissolved in a solvent.
  • the solvent include water, dimethyl sulfoxide, dimethylformamide, dimethylacetamide, N-methylpyrrolidone, various glycols, polyhydric alcohols such as trimethylpropane, and amines such as ethylenediamine and diethylenetriamine. preferable. These can be used alone or in combination of two or more.
  • the PVA-based resin concentration of the coating liquid is preferably about 3 to 20 parts by weight with respect to 100 parts by weight of the solvent from the viewpoint of being able to form a uniform coating film in close contact with the thermoplastic resin base material. ..
  • the coating liquid preferably contains a halide from the viewpoint of improving the orientation of polyvinyl alcohol molecules by stretching.
  • a halide any suitable halide can be adopted, and examples thereof include iodide and sodium chloride.
  • the iodide include potassium iodide, sodium iodide, lithium iodide and the like, and potassium iodide is preferable.
  • the concentration of the halide in the coating liquid is preferably about 5 to 20 parts by weight, more preferably about 10 to 15 parts by weight, based on 100 parts by weight of the PVA-based resin.
  • an additive may be added to the coating liquid.
  • the additive include plasticizers such as ethylene glycol and glycerin; and surfactants such as nonionic surfactants.
  • any suitable method can be adopted as the coating method of the coating liquid, and for example, a roll coating method, a spin coating method, a wire bar coating method, a dip coating method, a die coating method, a curtain coating method, and a spray coating method can be adopted. , Knife coat method (comma coat method, etc.) and the like.
  • the drying temperature of the coating liquid is preferably about 50 ° C. or higher.
  • the stretching method of the aerial auxiliary stretching treatment may be fixed-end stretching (for example, a method of stretching using a tenter stretching machine) or free-end stretching (for example, a method of uniaxial stretching through a laminate between rolls having different peripheral speeds). ), But free-end stretching is preferable from the viewpoint of obtaining high optical characteristics.
  • the draw ratio in the aerial auxiliary stretching is preferably about 2 to 3.5 times.
  • the aerial auxiliary stretching may be performed in one step or in multiple steps. When performed in multiple stages, the draw ratio is the product of the draw ratios of each stage.
  • the stretching temperature in the aerial auxiliary stretching can be set to an arbitrary appropriate value depending on the material for forming the thermoplastic resin base material, the stretching method, and the like, and for example, the glass transition temperature (Tg) of the thermoplastic resin base material. ) Or higher, more preferably the glass transition temperature (Tg) + 10 ° C. or higher, and even more preferably the glass transition temperature (Tg) + 15 ° C. or higher.
  • the upper limit of the stretching temperature is from the viewpoint of suppressing the rapid progress of crystallization of the PVA-based resin and suppressing defects due to crystallization (for example, hindering the orientation of the PVA-based resin layer due to stretching). , It is preferably about 170 ° C.
  • an insolubilization treatment may be performed after the aerial auxiliary stretching treatment and before the dyeing treatment or the underwater stretching treatment.
  • the insolubilization treatment is typically performed by immersing a PVA-based resin layer in an aqueous boric acid solution.
  • the concentration of the boric acid aqueous solution is preferably about 1 to 5 parts by weight with respect to 100 parts by weight of water.
  • the liquid temperature of the insolubilizing bath is preferably about 20 to 50 ° C.
  • the dyeing treatment is performed by dyeing the PVA-based resin layer with iodine.
  • the adsorption method include a method of immersing a PVA-based resin layer (laminate) in a dyeing solution containing iodine, a method of applying the dyeing solution to the PVA-based resin layer, and a method of applying the dyeing solution to the PVA-based resin layer.
  • Examples thereof include a method of spraying, and a method of immersing a PVA-based resin layer (laminate) in a dyeing solution containing iodine is preferable.
  • the amount of iodine compounded in the dyeing bath is preferably about 0.05 to 0.5 parts by weight with respect to 100 parts by weight of water.
  • the blending amount of the iodide is preferably about 0.1 to 10 parts by weight, more preferably about 0.3 to 5 parts by weight, based on 100 parts by weight of water.
  • the liquid temperature of the dyeing bath is preferably about 20 to 50 ° C. in order to suppress the dissolution of the PVA-based resin.
  • the immersion time is preferably about 5 seconds to 5 minutes, more preferably about 30 seconds to 90 seconds, from the viewpoint of ensuring the transmittance of the PVA-based resin layer.
  • the ratio of the content of iodine and iodide in the iodine aqueous solution is preferably about 1: 5 to 1:20, preferably about 1: 5 to 1:10. More preferably.
  • a cross-linking treatment may be performed after the dyeing treatment and before the underwater stretching treatment.
  • the cross-linking treatment is typically performed by immersing a PVA-based resin layer in an aqueous boric acid solution.
  • the boric acid concentration of the boric acid aqueous solution is preferably about 1 to 5 parts by weight with respect to 100 parts by weight of water.
  • the elution of iodine adsorbed on the PVA-based resin layer can be suppressed.
  • the blending amount of the iodide is preferably about 1 to 5 parts by weight with respect to 100 parts by weight of water.
  • the liquid temperature of the cross-linked bath is preferably about 20 to 50 ° C.
  • the underwater stretching treatment is performed by immersing the laminate in a stretching bath.
  • the thermoplastic resin base material or the PVA-based resin layer can be stretched at a temperature lower than the glass transition temperature (typically, about 80 ° C.), and the PVA-based resin layer can be crystallized. It can be stretched at a high magnification while suppressing it.
  • the stretching method of the underwater stretching treatment may be fixed-end stretching (for example, a method of stretching using a tenter stretching machine) or free-end stretching (for example, a method of uniaxial stretching through a laminate between rolls having different peripheral speeds).
  • free-end stretching is preferable from the viewpoint of obtaining high optical characteristics.
  • the underwater stretching treatment is preferably carried out by immersing the laminate in a boric acid aqueous solution (boric acid water stretching).
  • a boric acid aqueous solution boric acid water stretching
  • the boric acid concentration of the boric acid aqueous solution is preferably 1 to 10 parts by weight, more preferably 2.5 to 6 parts by weight, based on 100 parts by weight of water.
  • iodide may be blended in the stretching bath (boric acid aqueous solution).
  • the liquid temperature of the stretching bath is preferably about 40 to 85 ° C, more preferably about 60 ° C to 75 ° C.
  • the immersion time of the laminate in the stretching bath is preferably about 15 seconds to 5 minutes.
  • the stretching ratio in the underwater stretching is preferably about 1.5 times or more, and more preferably about 3 times or more.
  • the total draw ratio of the laminated body is preferably about 5 times or more, and more preferably about 5.5 times or more with respect to the original length of the laminated body.
  • the drying shrinkage treatment may be performed by heating the entire zone or by heating the transport roll (using a so-called heating roll), but preferably both are used.
  • a heating roll By drying using a heating roll, it is possible to efficiently suppress the heating curl of the laminate to produce a polarizing film having an excellent appearance, and it is possible to dry the laminate while maintaining it in a flat state. Therefore, not only curl but also wrinkles can be suppressed.
  • the shrinkage rate in the width direction of the laminate by the drying shrinkage treatment is 1 to 10%. It is preferably about 2 to 8%, and more preferably about 2 to 8%.
  • Drying conditions can be controlled by adjusting the heating temperature of the transport roll (temperature of the heating roll), the number of heating rolls, the contact time with the heating roll, and the like.
  • the temperature of the heating roll is preferably about 60 to 120 ° C., more preferably about 65 to 100 ° C., and even more preferably 70 to 80 ° C.
  • the number of transport rolls is usually about 2 to 40, preferably about 4 to 30.
  • the contact time (total contact time) between the laminate and the heating roll is preferably about 1 to 300 seconds, more preferably 1 to 20 seconds, and even more preferably 1 to 10 seconds.
  • the heating roll may be provided in a heating furnace or in a normal production line (in a room temperature environment). Preferably, it is provided in a heating furnace provided with a blowing means.
  • a steep temperature change between the heating rolls can be suppressed, and shrinkage in the width direction can be easily controlled.
  • the temperature of hot air drying is preferably about 30 to 100 ° C.
  • the hot air drying time is preferably about 1 to 300 seconds.
  • the cleaning treatment is typically performed by immersing a PVA-based resin layer in an aqueous potassium iodide solution.
  • each treatment bath in the dyeing treatment step, the underwater stretching treatment step, the insolubilization treatment step, the cross-linking treatment step, and the cleaning treatment step includes zinc salts, pH adjusters, pH buffers, and other salts.
  • Additives may be contained.
  • the zinc salt include zinc halides such as zinc chloride and zinc iodide; and inorganic zinc salts such as zinc sulfate and zinc acetate.
  • the pH adjuster include strong acids such as hydrochloric acid, sulfuric acid and nitric acid, and strong bases such as sodium hydroxide and potassium hydroxide.
  • Examples of the pH buffer include carboxylic acids such as acetic acid, oxalic acid and citric acid and salts thereof, and inorganic weak acids such as phosphoric acid and carbonic acid and salts thereof.
  • Examples of the other salts include chlorides such as sodium chloride, potassium chloride and barium chloride, nitrates such as sodium nitrate and potassium nitrate, sulfates such as sodium sulfate and potassium sulfate, and alkali metals and alkaline earth metals. Examples include salt.
  • the functional layer of the present invention is adjacent to the image display cell side of the polarizing film and contains a water-soluble radical scavenger.
  • the water-soluble radical trapping agent is preferably a compound that can dissolve 1 part by weight or more with respect to 100 parts by weight of water at 25 ° C. from the viewpoint of easily transferring to water in the polarizing film, and 100 parts by weight of water at 25 ° C.
  • a compound that can dissolve 2 parts by weight or more with respect to parts is more preferable, and a compound that can dissolve 5 parts by weight or more with respect to 100 parts by weight of water at 25 ° C. is further preferable.
  • the water-soluble radical scavenger may be used alone or in combination of two or more.
  • the water-soluble radical scavenger can suppress polyene formation of the polarizing film in a high temperature environment.
  • the water-soluble radical scavenger include radical scavengers such as hindered phenol-based, hindered amine-based, phosphorus-based, sulfur-based, benzotriazole-based, benzophenone-based, hydroxylamine-based, salicylate ester-based, and triazine-based compounds. Examples include compounds having a function.
  • the water-soluble radical scavenger is preferably, for example, a nitroxy radical or a compound having a nitroxide group from the viewpoint of the radical species generated in the polarizing film.
  • N-oxyl compound functional group, the C-N (-C) -O ⁇ compounds having (O ⁇ is an oxy radical)
  • known materials can be used.
  • N-oxyl compound include compounds having an organic group having the following structure.
  • R 1 represents an oxy radical
  • R 2 to R 5 independently represent a hydrogen atom or an alkyl group having 1 to 10 carbon atoms
  • n represents 0 or 1.
  • the left side of the dotted line indicates an arbitrary organic group.
  • Examples of the compound having an organic group include compounds represented by the following general formulas (2) to (5).
  • R 1 to R 5 and n are the same as above, and R 6 represents a hydrogen atom or an alkyl group having 1 to 10 carbon atoms, an acyl group, or an aryl group. , N represents 0 or 1.
  • R 1 to R 5 and n are the same as above, and R 7 and R 8 are independently hydrogen atoms or alkyl groups having 1 to 10 carbon atoms.
  • R 1 to R 5 and n are the same as described above, and R 9 to R 11 are independently hydrogen atoms or alkyl groups having 1 to 10 carbon atoms.
  • R 12 is a hydrogen atom or an alkyl group having 1 to 10 carbon atoms, an amino group, an alkoxy group and a hydroxy group. Represents a group or an aryl group.
  • R 2 to R 5 are preferably alkyl groups having 1 to 6 carbon atoms and having 1 to 3 carbon atoms from the viewpoint of availability. It is more preferably an alkyl group.
  • R 6 is preferably a hydrogen atom or an alkyl group having 1 to 10 carbon atoms, and more preferably a hydrogen atom.
  • R 7 and R 8 are preferably hydrogen atoms independently or alkyl groups having 1 to 10 carbon atoms, and are hydrogen atoms. Is more preferable.
  • R 9 to R 11 are preferably hydrogen atoms or alkyl groups having 1 to 10 carbon atoms.
  • R 12 is preferably a hydroxy group, an amino group, or an alkoxy group.
  • n is preferably 1 from the viewpoint of availability.
  • N-oxyl compound examples include N- described in JP-A-2003-64022, JP-A-11-222462, JP-A-2002-284737, and International Publication No. 2016/047655. Oxyl compounds can be mentioned.
  • examples of the compound having a nitroxyl radical or a nitroxide group include the following compounds.
  • R represents a hydrogen atom or an alkyl group having 1 to 10 carbon atoms, an acyl group, or an aryl group.
  • the water-soluble radical scavenger preferably has a molecular weight of 1000 or less, more preferably 500 or less, and more preferably 300 or less, from the viewpoint of suppressing polyene formation of the polarizing film in a high temperature environment. Is even more preferable.
  • the content of the water-soluble radical scavenger in the functional layer is preferably 0.1% by weight or more, preferably 5% by weight or more, in the functional layer from the viewpoint of suppressing polyene formation of the polarizing film. More preferably, it is more preferably 10% by weight or more, and from the viewpoint of the appearance of the functional layer after the drying process, it is preferably 50% by weight or less, and 40% by weight or less. More preferably, it is more preferably 30% by weight or less.
  • the functional layer can be used without limitation as long as the material forming the layer is a binder resin capable of forming a layer such as a coating film, and examples thereof include water-soluble plastic resins such as polyvinyl alcohol-based resin and polyacrylamide. Among these, polyvinyl alcohol-based resins are preferable from the viewpoint of adhesion to the polarizing film and durability.
  • the binder resin may be used alone or in combination of two or more.
  • polyvinyl alcohol-based resin examples include polyvinyl alcohol.
  • Polyvinyl alcohol is obtained by saponifying polyvinyl acetate.
  • examples of the polyvinyl alcohol-based resin include a saponified product of a copolymer of vinyl acetate and a monomer having copolymerizability.
  • the copolymerizable monomer is ethylene
  • an ethylene-vinyl alcohol copolymer can be obtained.
  • the copolymerizable monomer include unsaturated carboxylic acids such as (anhydrous) maleic acid, fumaric acid, crotonic acid, itaconic acid, and (meth) acrylic acid and esters thereof; ethylene and propylene.
  • ⁇ -Olefin (meth) allylsulfonic acid (soda), sodium sulfonic acid (monoalkylmalate), sodium disulfonic acid alkylmalate, N-methylolacrylamide, acrylamidealkylsulfonic acid alkali salt, N-vinylpyrrolidone, etc.
  • examples thereof include N-vinylpyrrolidone derivatives.
  • the polyvinyl alcohol-based resin include a modified polyvinyl alcohol-based resin having a hydrophilic functional group in the side chain of the polyvinyl alcohol or a copolymer thereof.
  • the hydrophilic functional group include an acetoacetyl group and a carbonyl group.
  • a polyvinyl alcohol-based resin may be acetalized, urethanized, etherified, grafted, phosphorylated or the like.
  • the saponification degree of the polyvinyl alcohol-based resin may be, for example, 88% or more, and from the viewpoint of optical durability under high temperature and high humidity, the saponification degree is preferably 90% or more, and is 95%. % Or more is more preferable.
  • the degree of saponification can be determined according to JIS K 6726.
  • the functional layer is formed from a resin composition containing the binder resin as a main component.
  • the proportion of the binder resin in the functional layer is preferably 70% by weight or more, preferably 80% by weight or more. More preferably, it is more preferably 90% by weight or more.
  • the resin composition may be prepared as a solution in which the binder resin is dissolved or dispersed in a solvent.
  • the solvent include water, dimethyl sulfoxide, dimethylformamide, dimethylacetamide N-methylpyrrolidone, glycols, alcohols, amines such as ethylenediamine and diethylenetriamine, and the like.
  • the solvent may be used alone or in combination of two or more.
  • the functional layer may contain additives such as a cross-linking agent, a plasticizer, a surfactant, a coupling agent, a tackifier, a heat-resistant stabilizer, and a hydrolysis-resistant stabilizer.
  • additives such as a cross-linking agent, a plasticizer, a surfactant, a coupling agent, a tackifier, a heat-resistant stabilizer, and a hydrolysis-resistant stabilizer.
  • the functional layer may be formed, for example, by applying the resin composition to the polarizing film and drying it.
  • the coating method is not particularly limited, and examples thereof include a roll coating method, a spin coating method, a wire bar coating method, a dip coating method, a die coating method, a curtain coating method, a spray coating method, and a knife coating method.
  • the functional layer is preferably 0.1 ⁇ m or more, more preferably 0.2 ⁇ m or more, further preferably 0.5 ⁇ m or more, and at a high temperature, from the viewpoint of suppressing polyene formation of the polarizing film. From the viewpoint of optical durability under high humidity, it is preferably 10 ⁇ m or less, more preferably 5 ⁇ m or less, further preferably 2 ⁇ m or less, and even more preferably 1 ⁇ m or less.
  • the polarizing film is provided with a first transparent protective film on the functional layer via an adhesive layer. Further, the polarizing film may be provided with a second transparent protective film on the surface of the polarizing film opposite to the image display cell side.
  • the first and second transparent protective films are not particularly limited, and various transparent protective films used for the polarizing film can be used.
  • a thermoplastic resin having excellent transparency, mechanical strength, thermal stability, moisture blocking property, isotropic property and the like is used.
  • the thermoplastic resin include cell roll ester resins such as triacetyl cellulol, polyester resins such as polyethylene terephthalate and polyethylene naphthalate, polyether sulfone resins, polysulfone resins, polycarbonate resins, nylon and fragrances.
  • Polyamide-based resin such as group polyamide, polyimide-based resin, polyethylene, polypropylene, polyolefin-based resin such as ethylene / propylene copolymer, (meth) acrylic-based resin, cyclic polyolefin-based resin having a cyclo-based or norbornene structure (norbornene-based resin) ), Polyallylate-based resin, polystyrene-based resin, polyvinyl alcohol-based resin, and mixtures thereof.
  • a cured layer formed of a thermosetting resin such as (meth) acrylic, urethane, acrylic urethane, epoxy, silicone or the like or an ultraviolet curable resin can be used.
  • cell roll ester-based resins, polycarbonate-based resins, (meth) acrylic-based resins, cyclic polyolefin-based resins, and polyester-based resins are preferable.
  • the thickness of the first and second transparent protective films can be appropriately determined, but in general, it is preferably about 1 to 500 ⁇ m from the viewpoint of workability such as strength and handleability, thin layer property, and the like. It is more preferably about 1 to 300 ⁇ m, and even more preferably about 5 to 100 ⁇ m.
  • the transparent protective films on both sides may be the same or different.
  • a retardation plate 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 phase difference is usually controlled in the range of 40 to 200 nm
  • the thickness direction phase difference is usually controlled in the range of 80 to 300 nm.
  • the retardation plate also functions as a transparent protective film, so that the thickness can be reduced.
  • the retardation plate examples include a birefringent film formed by uniaxially or biaxially stretching a polymer material, an alignment film of a liquid crystal polymer, and a film in which an alignment layer of a liquid crystal polymer is supported by a film.
  • the thickness of the retardation plate is not particularly limited, but is generally about 20 to 150 ⁇ m.
  • the phase plate may be attached to a transparent protective film having no phase difference.
  • any suitable suitable such as an ultraviolet absorber, an antioxidant, a lubricant, a plasticizer, a mold release agent, an antioxidant, a flame retardant, an antistatic agent, a pigment, and a colorant. Additives may be included.
  • the transparent protective film contains an ultraviolet absorber, the light resistance of the polarizing film can be improved.
  • the first transparent protective film from the viewpoint of production efficiency of the drying process after bonding, permeability is preferably humidity is 300g / (m 2 ⁇ 24h) or less, 200g / (m 2 ⁇ 24h ) or less Is more preferable.
  • the second transparent protective film from the viewpoint of the durability of high temperature and high humidity of the polarizing plate, it is preferable that moisture permeability is 100g / (m 2 ⁇ 24h) or more, 200g / (m 2 ⁇ 24h ) or higher more preferably, and permeability is preferably humidity is 1000g / (m 2 ⁇ 24h) or less, and more preferably 600g / (m 2 ⁇ 24h) or less.
  • the humidity permeability is determined according to the JIS Z0208 moisture permeability test (cup method), and a sample cut to a diameter of 60 mm is set in a moisture permeability cup containing about 15 g of calcium chloride, and the temperature is 40 ° C. and the humidity is 90%.
  • R. H. It can be calculated by measuring the weight increase of calcium chloride before and after being placed in a constant temperature machine and left for 24 hours.
  • a hard coat layer such as an antireflection layer, a sticking prevention layer, a diffusion layer, and an antiglare layer
  • Other layers such as a hard coat layer, an antireflection layer, a sticking prevention layer, a diffusion layer, and an antiglare layer can be provided on the surface of the first and second transparent protective films to which the polarizing films are not bonded.
  • Other layers such as the hard coat layer, the antireflection layer, the sticking prevention layer, the diffusion layer and the antiglare layer can be provided on the protective film itself, and are separately provided separately from the protective film. You can also.
  • the functional layer and the first transparent protective film are bonded to each other via an adhesive layer.
  • the polarizing film and the second transparent protective film, the first and second transparent protective films and the other layer, or the polarizing film and the other layer are usually an adhesive layer or an adhesive layer. It is pasted together via.
  • various pressure-sensitive adhesives used in polarizing films can be applied.
  • examples thereof include alkyl ether adhesives, polyvinyl alcohol adhesives, polyvinyl porolidone adhesives, polyacrylamide adhesives, cellulose adhesives and the like.
  • an acrylic pressure-sensitive adhesive is preferable.
  • the pressure-sensitive adhesive layer for example, a method in which the pressure-sensitive adhesive is applied to a separator or the like that has been peeled off and dried to form a pressure-sensitive adhesive layer and then transferred to a polarizing film or the like, or the pressure-sensitive adhesive is polarized. Examples thereof include a method of applying to a film or the like and drying to form an adhesive layer.
  • the thickness of the pressure-sensitive adhesive layer is not particularly limited, and is, for example, about 1 to 100 ⁇ m, preferably about 2 to 50 ⁇ m.
  • the adhesive for forming the adhesive layer various adhesives used for the polarizing film can be applied.
  • isocyanate-based adhesives polyvinyl alcohol-based adhesives, gelatin-based adhesives, vinyl-based latex-based adhesives, and the like.
  • Water-based polyester and the like can be mentioned.
  • These adhesives are usually used as an adhesive (water-based adhesive) composed of an aqueous solution, and contain 0.5 to 60% by weight of a solid content.
  • a polyvinyl alcohol-based adhesive is preferable, and an acetoacetyl group-containing polyvinyl alcohol-based adhesive is more preferable.
  • a water-based adhesive is preferable from the viewpoint of adhesion between the functional layer and the polarizing film.
  • the water-based adhesive may contain a cross-linking agent.
  • a cross-linking agent a compound having at least two functional groups in one molecule having reactivity with a component such as a polymer constituting the adhesive is usually used, and for example, alkylenediamines; isocyanates; epoxies; Aldehydes: Amino-formaldehyde and the like such as methylol urea and methylol melamine can be mentioned.
  • the blending amount of the cross-linking agent in the adhesive is usually about 10 to 60 parts by weight with respect to 100 parts by weight of the components such as the polymer constituting the adhesive.
  • examples of the adhesive include active energy ray-curable adhesives such as ultraviolet curable adhesives and electron beam-curable adhesives.
  • active energy ray-curable adhesive include (meth) acrylate-based adhesives.
  • examples of the curable component in the (meth) acrylate-based adhesive include a compound having a (meth) acryloyl group and a compound having a vinyl group.
  • examples of the compound having a (meth) acryloyl group include alkyl (meth) acrylates having 1 to 20 carbon atoms, such as chain alkyl (meth) acrylates, alicyclic alkyl (meth) acrylates, and polycyclic alkyl (meth) acrylates.
  • the (meth) acrylate-based adhesives are hydroxyethyl (meth) acrylamide, N-methylol (meth) acrylamide, N-methoxymethyl (meth) acrylamide, N-ethoxymethyl (meth) acrylamide, (meth) acrylamide, and (meth). It may contain a nitrogen-containing monomer such as acrylamide.
  • the (meth) acrylate-based adhesive contains tripropylene glycol diacrylate, 1,9-nonanediol diacrylate, tricyclodecanedimethanol diacrylate, cyclic trimethylolpropane formal acrylate, dioxane glycol diacrylate, and EO as cross-linking components. It may contain a polyfunctional monomer such as modified diglycerin tetraacrylate. Further, a compound having an epoxy group or an oxetanyl group can also be used as the cationic polymerization curable adhesive.
  • the compound having an epoxy group is not particularly limited as long as it has at least two epoxy groups in the molecule, and various generally known curable epoxy compounds can be used.
  • the adhesive may contain an appropriate additive if necessary.
  • the additive include a silane coupling agent, a coupling agent such as a titanium coupling agent, an adhesion promoter such as ethylene oxide, an ultraviolet absorber, a deterioration inhibitor, a dye, a processing aid, an ion trap agent, and an antioxidant.
  • the adhesive may be applied to any of the functional layer side, the first and second transparent protective film side (or the other layer side), and the polarizing film side, or both. ..
  • a drying step is performed to form an adhesive layer composed of a coating and drying layer. After the drying step, ultraviolet rays or electron beams can be irradiated if necessary.
  • the thickness of the adhesive layer is not particularly limited, and when a water-based adhesive or the like is used, it is preferably about 30 to 5000 nm, more preferably about 100 to 1000 nm, and an ultraviolet curable adhesive. When an electron beam curable adhesive or the like is used, it is preferably about 0.1 to 100 ⁇ m, more preferably about 0.5 to 10 ⁇ m.
  • the total thickness of the functional layer and the adhesive layer is 0 from the viewpoint of suppressing polyene formation of the polarizing film. It is preferably 2 ⁇ m or more, more preferably 0.3 ⁇ m or more, further preferably 0.6 ⁇ m or more, and 11 ⁇ m or less from the viewpoint of durability of the polarizing plate under high temperature and high humidity. It is preferably 6 ⁇ m or less, more preferably 4 ⁇ m or less, and even more preferably 2 ⁇ m or less.
  • the polarizing film, the functional layer, the first and second transparent protective films, and the other layers may be surface-modified or easily adhered.
  • Examples of the surface modification treatment include corona treatment, plasma treatment, primer treatment, saponification treatment and the like.
  • Examples of the easy-adhesion treatment include treatment with a forming material containing various resins having a polyester skeleton, a polyether skeleton, a polycarbonate skeleton, a polyurethane skeleton, a silicone type, a polyamide skeleton, a polyimide skeleton, a polyvinyl alcohol skeleton, and the like.
  • the functional layer and the first transparent protective film, the second transparent protective film and the polarizing film, the first and second transparent protective films and the other layer, or the polarizing film and the other layer , A block layer, a refractive index adjusting layer, and other intervening layers may be laminated.
  • the block layer is a layer having a function to prevent impurities such as oligomers and ions eluted from the transparent protective film and the like from migrating (invading) into the polarizing film.
  • the block layer may be a layer having transparency and capable of preventing impurities eluted from the transparent protective film or the like, and examples of the material forming the block layer include urethane prepolymer-based forming materials and cyanoacrylates. Examples include system-forming materials and epoxy-based forming materials.
  • the refractive index adjusting layer is a layer provided to suppress a decrease in transmittance due to reflection between layers having different refractive indexes such as the transparent protective film and a polarizing film.
  • the refractive index adjusting material for forming the refractive index adjusting layer include a forming agent containing various resins having silica-based, acrylic-based, acrylic-styrene-based, melamine-based, and the like, and additives.
  • the polarizing film is bonded to an optical layer.
  • the optical layer is not particularly limited, but for example, a reflecting plate, a transflective plate, a retardation plate (including a wave plate such as 1/2 or 1/4), a liquid crystal display device such as a viewing angle compensation film, or the like is formed.
  • a reflecting plate a transflective plate
  • a retardation plate including a wave plate such as 1/2 or 1/4
  • a liquid crystal display device such as a viewing angle compensation film, or the like is formed.
  • One or two or more optical layers that may be used in the above can be used.
  • the laminated polarizing film is particularly a reflective polarizing film or a semi-transmissive polarizing film in which a reflecting plate or a semi-transmissive reflecting plate is further laminated on the polarizing film, and a retardation plate is further laminated on the polarizing film.
  • Examples thereof include an elliptically polarizing film or a circularly polarizing film, a wide viewing angle polarizing film in which a viewing angle compensating film is further laminated on the polarizing film, and a polarizing film in which a brightness improving film is further laminated on the polarizing film.
  • an image display cell such as a liquid crystal cell or an organic EL element, and another front transparent member such as a front transparent plate or a touch panel on the viewing side are used.
  • An adhesive layer for bonding the members may be attached.
  • an adhesive layer is suitable.
  • the pressure-sensitive adhesive forming the pressure-sensitive adhesive layer is not particularly limited, and for example, those using 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 as a base polymer are used. It can be appropriately selected and used.
  • a pressure-sensitive adhesive containing an acrylic polymer which has excellent optical transparency, exhibits appropriate wettability, cohesiveness, and adhesiveness, and has excellent weather resistance, heat resistance, and the like is preferably used.
  • the pressure-sensitive adhesive layer can be attached to one or both sides of the polarizing film or the laminated polarizing film by an appropriate method.
  • the pressure-sensitive adhesive layer may be attached, for example, by preparing a pressure-sensitive adhesive solution and directly attaching the pressure-sensitive adhesive solution onto the polarizing film or the laminated polarizing film by an appropriate developing method such as a casting method or a coating method, or a separator. Examples thereof include a method in which an adhesive layer is formed on the polarizing film and the adhesive layer is transferred onto the polarizing film or the laminated polarizing film.
  • the thickness of the pressure-sensitive adhesive layer can be appropriately determined according to the purpose of use, adhesive strength, etc., and is generally 1 to 500 ⁇ m, preferably 5 to 200 ⁇ m, and more preferably 10 to 100 ⁇ m.
  • a polarizing film or a laminated polarizing film having an adhesive layer provided on at least one surface thereof is referred to as a polarizing film with an adhesive layer or a laminated polarizing film with an adhesive layer.
  • the exposed surface of the pressure-sensitive adhesive layer is temporarily covered with a separator for the purpose of preventing contamination or the like until it is put into practical use.
  • a separator for example, an appropriate thin leaf such as a plastic film, a rubber sheet, a paper, a cloth, a non-woven fabric, a net, a foam sheet or a metal foil, or a laminate thereof can be used, if necessary, a silicone-based or long-chain alkyl-based separator.
  • Those coated with an appropriate release agent such as fluorine-based or molybdenum sulfide are used.
  • the image display panel of the present invention has an image display cell and the polarizing film or the laminated polarizing film. Further, the image display device of the present invention has the image display panel and a front transparent member.
  • Examples of the image display cell include a liquid crystal cell and an organic EL cell.
  • Examples of the liquid crystal cell include a reflective liquid crystal cell that uses external light, a transmissive liquid crystal cell that uses light from a light source such as a backlight, and a semi-transmissive liquid crystal cell that uses both external light and light from a light source. Any of the semi-reflective liquid crystal cells may be used.
  • a polarizing film is also arranged on the side opposite to the viewing side of the image display cell (liquid crystal cell), and the light source is further arranged. Be placed.
  • the polarizing film on the light source side and the liquid crystal cell are bonded to each other via an appropriate adhesive layer.
  • any type such as VA mode, IPS mode, TN mode, STN mode and bend orientation ( ⁇ type) can be used.
  • organic EL cell for example, a cell in which a transparent electrode, an organic light emitting layer, and a metal electrode are sequentially laminated on a transparent substrate to form a light emitting body (organic electroluminescence light emitting body) is preferably used.
  • the organic light emitting layer is a laminate of various organic thin films, for example, a laminate of a hole injection layer made of a triphenylamine derivative or the like and a light emitting layer made of a fluorescent organic solid such as anthracene, or these.
  • Various layer configurations can be adopted, such as a laminate of an electron-injected layer composed of the light-emitting layer and a perylene derivative, or a laminate of a hole-injected layer, a light-emitting layer, and an electron-injected layer.
  • Examples of the front transparent member arranged on the visual side of the image display cell include a front transparent plate (window layer) and a touch panel.
  • a front transparent plate a transparent plate having appropriate mechanical strength and thickness is used.
  • a transparent plate for example, a transparent resin plate such as an acrylic resin or a polycarbonate resin, a glass plate, or the like is used.
  • the touch panel for example, various touch panels such as a resistive film method, a capacitance method, an optical method, and an ultrasonic method, a glass plate having a touch sensor function, a transparent resin plate, and the like are used.
  • a capacitance type touch panel is used as the front transparent member, it is preferable to provide a front transparent plate made of glass or a transparent resin plate on the visual side of the touch panel.
  • Example 1> ⁇ Preparation of polarizing film> Amorphous isophthalic acid copolymerized polyethylene terephthalate (IPA copolymerized PET) film (thickness: 100 ⁇ m) having a water absorption rate of 0.75% and a Tg of 75 ° C. Alcohol (degree of polymerization 4200, degree of saponification 99.2 mol%) and acetoacetyl-modified PVA (degree of polymerization 1200, degree of acetoacetyl modification 4.6%, degree of saponification 99.0 mol% or more, manufactured by Nippon Synthetic Chemical Industry Co., Ltd.
  • the polarizing plate 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 (dyeing treatment). Then, it was immersed in a cross-linked bath at a liquid temperature of 30 ° C. (an aqueous boric acid solution obtained by blending 3 parts by weight of potassium iodide and 3 parts by weight of boric acid with respect to 100 parts by weight of water) for 30 seconds. (Crossing treatment). Then, the laminate is immersed in an aqueous solution of boric acid having a liquid temperature of 70 ° C.
  • ⁇ Preparation of resin composition forming functional layer> A polyvinyl alcohol resin having a degree of polymerization of 2500 and a degree of saponification of 99.8 mol% (manufactured by Japan Vam & Poval Co., Ltd., trade name: JC-25H) dissolved in pure water and water-soluble represented by the following general formula (9).
  • the thickness of the functional layer is determined by cutting the cross section with a microtome (manufactured by Leica, "EM UC7”) as a pretreatment, subjecting the cut surface to metal ion sputtering, and then SEM (manufactured by JEOL Ltd., "JSM-7100F”). The film thickness was measured using. The results are shown in Table 1.
  • acrylic resin film moisture permeability 100g / (m 2 ⁇ 24h) , Toyo Kohan Co., "RZ30" easy-adhesion treated face in the After bonding with a roll bonding machine so as to be in contact with the functional layer, the film was continuously heated and dried in an oven (temperature: 60 ° C., time: 4 minutes) to prepare a polarizing film.
  • the above-mentioned water-based adhesive is a weight ratio of a polyvinyl alcohol resin containing an acetoacetyl group (average degree of polymerization of 1,200, saponification degree of 98.5 mol%, acetoacetylation degree of 5 mol%) and methylol melamine.
  • An aqueous solution containing 3: 1 was used. Further, the water-based adhesive and the functional layer are deformed by swelling after being laminated, and the interfaces are mixed and it is difficult to separate them. Therefore, the total thickness of the functional layer and the water-based adhesive layer was measured by SEM in the same manner as the functional layer described above. The results are shown in Table 1.
  • the simple substance transmittance is a Y value obtained by correcting the luminosity factor with a 2 degree field of view (C light source) of JlS Z 8701-1982.
  • the measurement wavelength is 380 to 780 nm (every 5 nm).
  • the results of these ⁇ Ts are shown in Table 1.
  • Example 2 A polarizing film and a pseudo image panel were prepared in the same manner as in Example 1 except that the functional layer single film was laminated so as to have a thickness of 0.4 ⁇ m, and used for evaluation. The results are shown in Table 1.
  • Example 3 A polarizing film and a pseudo image panel were prepared in the same manner as in Example 1 except that the functional layer single film was laminated so as to have a thickness of 1.5 ⁇ m, and used for evaluation. The results are shown in Table 1.
  • Example 4 A polarizing film and a pseudo image panel were prepared in the same manner as in Example 1 except that the water-soluble radical scavenger contained in the functional layer was prepared so as to have a solid content ratio of 15% by weight, and used for evaluation. The results are shown in Table 1.

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WO2017169918A1 (ja) * 2016-03-29 2017-10-05 日東電工株式会社 偏光フィルムおよび画像表示装置
JP2020030342A (ja) * 2018-08-23 2020-02-27 日東電工株式会社 偏光子、偏光フィルム、光学フィルム、ならびに画像表示装置

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