WO2020070962A1 - 偏光板 - Google Patents

偏光板

Info

Publication number
WO2020070962A1
WO2020070962A1 PCT/JP2019/030356 JP2019030356W WO2020070962A1 WO 2020070962 A1 WO2020070962 A1 WO 2020070962A1 JP 2019030356 W JP2019030356 W JP 2019030356W WO 2020070962 A1 WO2020070962 A1 WO 2020070962A1
Authority
WO
WIPO (PCT)
Prior art keywords
polarizer
weight
polarizing plate
sensitive adhesive
pressure
Prior art date
Application number
PCT/JP2019/030356
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
聡司 三田
Original Assignee
日東電工株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 日東電工株式会社 filed Critical 日東電工株式会社
Priority to JP2020549988A priority Critical patent/JPWO2020070962A1/ja
Priority to KR1020217007826A priority patent/KR20210071956A/ko
Priority to CN201980064681.9A priority patent/CN112867947A/zh
Publication of WO2020070962A1 publication Critical patent/WO2020070962A1/ja

Links

Images

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
    • 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
    • C09J123/00—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers
    • C09J123/02—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers not modified by chemical after-treatment
    • C09J123/18—Homopolymers or copolymers of hydrocarbons having four or more carbon atoms
    • C09J123/20—Homopolymers or copolymers of hydrocarbons having four or more carbon atoms having four to nine carbon atoms
    • C09J123/22—Copolymers of isobutene; Butyl rubber ; Homo- or copolymers of other iso-olefines
    • 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
    • G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
    • 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

Definitions

  • the present invention relates to a polarizing plate.
  • a polarizer is used in an image display device such as a liquid crystal display device.
  • the polarizer is typically manufactured by dyeing a polyvinyl alcohol (PVA) -based resin film with a dichroic substance such as iodine (for example, Patent Documents 1 and 2).
  • PVA polyvinyl alcohol
  • iodine for example, Patent Documents 1 and 2.
  • the polarizer is also required to be thinner.
  • the amount of iodine taken into the PVA-based resin film in the dyeing step is limited, if the polarizer is simply made thinner, the ratio of iodine to PVA does not change, and the PVA-based resin film becomes thinner. The content of iodine also decreases.
  • a polarizer having a higher iodine content than before has been demanded.
  • a polarizer having a higher iodine content has a problem of durability in which the optical properties are significantly reduced in a high-temperature and high-humidity environment. More specifically, the polarizer loses its polarization performance at the end in a high-temperature and high-humidity environment, and may cause a phenomenon called color loss at the end.
  • the present invention has been made in order to solve the above problems, the main object of which is to include a polarizer having a high iodine content, and noticeable change in transmittance and edge color omission in a high-temperature and high-humidity environment.
  • An object of the present invention is to provide a suppressed polarizing plate.
  • the polarizing plate of the present invention has a polarizer, a protective film, and a pressure-sensitive adhesive layer.
  • the polarizer is composed of a polyvinyl alcohol-based resin film containing iodine, has a thickness of 5 ⁇ m or less, and has an iodine content of 12.5% by weight or more.
  • Adhesive layer is disposed adjacent to the polarizer, the moisture permeability is not more than 300g / m 2 / 24hr.
  • the polarizing plate has a transmittance change of less than 2.5% after being held for 500 hours in a 60 ° C. and 90% RH environment, and an edge color loss of 800 ⁇ m or less. It is.
  • the pressure-sensitive adhesive layer is composed of an active energy ray-crosslinkable rubber-based pressure-sensitive adhesive composition containing polyisobutylene.
  • the iodine content is significantly higher than the conventional polarizer (typically, iodine content Is 12.5% by weight or more), it is possible to obtain a polarizing plate in which the change in transmittance and the color loss at the end are significantly suppressed in a high-temperature and high-humidity environment.
  • the conventional polarizer typically, iodine content Is 12.5% by weight or more
  • FIG. 1 is a schematic sectional view of a polarizing plate according to one embodiment of the present invention.
  • FIG. 9 is a schematic diagram for explaining calculation of an edge color missing amount.
  • FIG. 1 is a schematic cross-sectional view of a polarizing plate according to one embodiment of the present invention.
  • the illustrated polarizing plate 100 includes a polarizer 10, a protective film 20 disposed on at least one side of the polarizer 10, and an adhesive layer 30 disposed on the opposite side of the polarizer 10 from the protective film 20.
  • the barrier function of the pressure-sensitive adhesive layer deformed in a high-temperature and high-humidity environment is improved by arranging the polarizer and the pressure-sensitive adhesive layer adjacent to each other (without interposing any other layer or film) as in the illustrated example. Can be demonstrated.
  • the barrier function of the pressure-sensitive adhesive layer will be described later.
  • the polarizer is formed of a PVA-based resin film containing iodine, has a thickness of 5 ⁇ m or less, and has an iodine content of 12.5% by weight or more.
  • the moisture permeability of the adhesive layer is not more than 300g / m 2 / 24hr. That is, the pressure-sensitive adhesive layer has a barrier function.
  • “having a barrier function” means that the amount of oxygen and / or water vapor that permeates the polarizer is controlled and the polarizer is substantially blocked therefrom.
  • the polarizer contains a high concentration of iodine and has a very small thickness
  • the stability of iodine is apt to be significantly reduced due to the intrusion of water in a high-temperature and high-humidity environment. Therefore, using a pressure-sensitive adhesive layer having a specific moisture permeability as described above, and by arranging adjacent to the polarizer, to obtain a polarizing plate that can maintain excellent optical properties even in a high temperature and high humidity environment Can be. More specifically, it is possible to obtain a polarizing plate in which the change in transmittance and the color loss at the end are significantly suppressed.
  • the polarizing plate according to the embodiment of the present invention preferably has a transmittance change amount after holding at 60 ° C. and 90% RH environment for 500 hours of less than 2.5%, more preferably less than 2.0%. , More preferably less than 1.7%.
  • the lower limit of the transmittance change is preferably zero, and in one embodiment is 0.1%.
  • the amount of color loss at the edge after holding at 60 ° C. and 90% RH for 500 hours is preferably 800 ⁇ m or less, more preferably 700 ⁇ m or less, and still more preferably. Is 500 ⁇ m or less, particularly preferably 400 ⁇ m or less, and most preferably 300 ⁇ m or less.
  • the lower limit of the amount of edge color loss is preferably zero, and in one embodiment, 10 ⁇ m.
  • the amount of color loss at the end can be calculated as follows: From the polarizing plate, a test piece of a predetermined size having two sides facing each other in the direction of the absorption axis and the direction perpendicular to the absorption axis is cut out.
  • the absorption axis direction typically corresponds to the stretching direction in the production of a polarizer.
  • the stretching direction may correspond to, for example, the long direction (transport direction (MD direction)) or the width direction (TD direction) of the polarizing plate.
  • MD direction transport direction
  • TD direction width direction
  • the test piece after heating and humidification is arranged in a crossed Nicols state with a standard polarizing plate, the state of color loss at the end of the test piece after heating and humidification is examined with a microscope. Specifically, the size of the color loss from the end of the test piece (polarizing plate or polarizer) (color loss amount: ⁇ m) is measured. As shown in FIG. 2, the length of the area where the color was missing from the corner of the test piece is defined as the amount of color loss at the end. The region where the color is missing has extremely low polarization characteristics and does not substantially function as a polarizing plate. Therefore, the smaller the amount of color loss, the better.
  • the transmittance (typically, the single transmittance) and the color loss at the end are substantially characteristics of the polarizer, but the components of the polarizing plate other than the polarizer are transmittance and color loss at the edge. Since it does not substantially affect the amount, the transmittance of the polarizer and the amount of color loss at the end are substantially equal to the transmittance of the polarizer and the amount of color loss at the end.
  • the polarizing plate according to the embodiment of the present invention has a small amount of edge color loss under a high temperature and high humidity environment. A description will be given of the suppression of such edge color omission.
  • the polarizer in the present invention has an iodine content of 12.5% by weight or more.
  • iodine content means the amount of all iodine contained in a polarizer (PVA-based resin film). More specifically, iodine can be present in the polarizer in the form of I ⁇ , I 2 , I 3 ⁇ , I 5 ⁇ and the like.
  • the iodine content in the present specification means the iodine content including all of these forms.
  • the iodine content can be measured by the method described in Examples. Specifically, it can be calculated by the following equation from the fluorescent X-ray intensity (kcps) obtained by the fluorescent X-ray analysis and the thickness ( ⁇ m) of the film (polarizer).
  • (Iodine content) 18.2 ⁇ (X-ray fluorescence intensity) / (Film thickness)
  • the fluorescent X-ray intensity per unit thickness of the polarizer is, for example, 0.50 kcps / ⁇ m or more, and preferably 0.65 kcps / ⁇ m or more.
  • the fluorescent X-ray intensity per unit thickness is in the above range, even if the polarizer is a thin polarizer of 5 ⁇ m or less, it will contain sufficient iodine to function as a polarizer.
  • the high iodine content in the polarizer implies that even a slight intrusion of water vapor reduces the stability of iodine, and particularly destroys iodine present in the form of I 2 , I 3 ⁇ , I 5 ⁇ and the like. is, typically I - meaning that becomes the state of. I - iodine of states, polarization function for the visible light region no absorption of light is impaired. When this situation affects the entire polarizing plate, the transmittance of the polarizing plate changes.
  • the thickness of the polarizer in the present invention is 5 ⁇ m or less as described above. Since the polarizer of the present invention is very thin as compared with the conventional polarizer obtained by stretching the PVA film, there is less penetration of moisture which causes iodine destruction at high temperature and high humidity from the end of the polarizer. . As a result, in a thin polarizer of 5 ⁇ m or less, invasion of moisture from the adhesive adjacent to the polarizer becomes dominant, and iodine in the polarizer is destroyed.
  • the polarizer has a thickness equal to or less than a predetermined value (the thickness of the polarizer is thin).
  • the pressure-sensitive adhesive layer can be formed without providing a barrier layer separately.
  • the end faces of the polarizer can be protected from oxygen and / or water vapor.
  • the end face of the polarizer can be covered more favorably.
  • the polarizing plate according to the embodiment of the present invention may be arranged on the viewing side of the display panel, or may be arranged on the opposite side to the viewing side, and a pair of polarizing plates according to the embodiment of the present invention are arranged on both sides. Is also good.
  • the polarizer 10 is composed of a PVA-based resin film containing iodine, as described above.
  • the polarizer may include an iron element, a sulfur element, a zinc element, a boron element, a potassium element, and the like. These elements can be included in the polarizer due to the method for manufacturing a polarizer described below. These elements may be contained alone or in combination of two or more.
  • PVAs the PVA-based resin forming the PVA-based resin film any appropriate resin can be adopted.
  • polyvinyl alcohol and ethylene-vinyl alcohol copolymer can be mentioned.
  • Polyvinyl alcohol is obtained by saponifying polyvinyl acetate.
  • the ethylene-vinyl alcohol copolymer is obtained by saponifying the ethylene-vinyl acetate copolymer.
  • the degree of saponification of the PVA-based resin is usually from 85 mol% to 100 mol%, preferably from 95.0 mol% to 99.95 mol%, more preferably from 99.0 mol% to 99.93 mol%. .
  • 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 having excellent durability can be obtained. If the degree of saponification is too high, gelation may occur.
  • the average polymerization degree of the PVA-based resin can be appropriately selected depending on the purpose.
  • the average degree of polymerization is usually from 1,000 to 10,000, preferably from 1,200 to 5,000, more preferably from 1,500 to 4,500.
  • the average degree of polymerization can be determined according to JIS @ K-6726-1994.
  • the polarizer contains iodine.
  • the polarizer is substantially a PVA-based resin film on which iodine is adsorbed and oriented.
  • the iodine content of the polarizer is 12.5% by weight or more, preferably 14% by weight or more, more preferably 16% by weight or more, and further preferably 20% by weight or more.
  • the iodine content is, for example, 60% by weight or less.
  • the iodine content can be, for example, from 12.5% to 30.0% by weight.
  • the boric acid content of the polarizer is, for example, 5.0% by weight to 25% by weight.
  • the polarizer may contain an iron element.
  • the polarizer contains the iron element, the humidification durability of the polarizer can be improved.
  • a polarizer having a high iodine content for example, humidification durability in a high-temperature humid environment such as 65 ° C. and 90% RH may become a problem. Therefore, a polarizer having a high iodine content further contains an iron element. Is preferred.
  • the iron content of the polarizer is preferably 500 ppm or more, more preferably 750 ppm or more. When the iron content of the polarizer is in the above range, the humidification durability of the polarizer can be improved.
  • the iron content of the polarizer can be, for example, 10,000 ppm or less. In the case of a polarizer having a thickness of 5 ⁇ m or less, by obtaining an iron content of the polarizer within the above range, a polarizer excellent in transmittance and degree of polarization and excellent in humidification durability can be obtained. Can be.
  • the iron content of the polarizer can be measured by ICP-MS.
  • the thickness of the PVA-based resin film (polarizer) is 5 ⁇ m or less as described above, preferably 2.5 ⁇ m or less, more preferably 2 ⁇ m or less, and still more preferably 1.5 ⁇ m or less.
  • the thickness of the PVA-based resin film is preferably 0.6 ⁇ m or more, more preferably 1.0 ⁇ m or more.
  • the polarizer preferably exhibits absorption dichroism at any wavelength of 380 nm to 780 nm.
  • the single transmittance of the polarizer is preferably 35.0% to 46.0%, and more preferably 38.0% to 43.0%.
  • the degree of polarization of the polarizer is preferably at least 99.0%, more preferably at least 99.9%. According to the present invention, such excellent optical properties (excellent balance between single transmittance and degree of polarization) and excellent durability (such excellent optical properties can be maintained even in a high-temperature and high-humidity environment). ) Can be compatible.
  • a polarizer can be produced, for example, by subjecting a PVA-based resin film to a swelling step, a dyeing step, a crosslinking step, a stretching step, a washing step, and a drying step.
  • the PVA-based resin film may be a PVA-based resin layer formed on a substrate.
  • the laminate of the substrate and the resin layer can be obtained by, for example, a method of applying the coating solution containing the PVA-based resin to the substrate, a method of laminating a PVA-based resin film on the substrate, or the like.
  • the substrate any appropriate resin substrate can be used, and for example, a thermoplastic resin substrate can be used.
  • Each step is performed at any appropriate timing. Further, if necessary, any steps other than the dyeing step may be omitted, a plurality of steps may be performed simultaneously, or each step may be performed a plurality of times. Hereinafter, each step will be described.
  • the swelling step is usually performed before the dyeing step.
  • the swelling step may be performed together with the dyeing step in the same immersion bath.
  • the swelling step is performed, for example, by immersing the PVA-based resin film in a swelling bath.
  • any appropriate liquid can be used, and for example, water such as distilled water or pure water is used.
  • the swelling bath may include any suitable other components other than water. Other components include solvents such as alcohols, additives such as surfactants, and iodides.
  • iodides examples include potassium iodide, lithium iodide, sodium iodide, zinc iodide, aluminum iodide, lead iodide, copper iodide, barium iodide, calcium iodide, tin iodide, and titanium iodide. And the like.
  • potassium iodide is used.
  • the temperature of the swelling bath is, for example, 20 ° C to 45 ° C.
  • the immersion time is, for example, 10 seconds to 300 seconds.
  • the PVA-based resin film is stretched at any appropriate stretching ratio depending on desired performance and thickness.
  • the stretching method may be uniaxial stretching or biaxial stretching. Typically, a PVA-based resin film is uniaxially stretched 3 to 7 times the original length.
  • the stretching direction may be the longitudinal direction of the film (MD direction) or the width direction of the film (TD direction).
  • the stretching method may be dry stretching, wet stretching, or a combination thereof.
  • the PVA-based resin film may be stretched when performing a crosslinking step, a swelling step, a dyeing step, or the like. Note that the stretching direction may correspond to the absorption axis direction of the obtained polarizer.
  • the PVA-based resin film is dyed using a dye solution containing a dichroic substance.
  • the dichroic substance is typically iodine.
  • the staining solution comprises polyiodide ions, iodide and an oxidizing agent for iodide ions.
  • an ionic compound composed of a cation and an anion is used.
  • an ionic compound in which the standard electrode potential of either an anion or a cation is higher than the standard electrode potential of iodine ion is preferably used.
  • the content of iodide contained in the dyeing solution is preferably 1 to 40 parts by weight, more preferably 3 to 20 parts by weight, based on 100 parts by weight of the solvent.
  • the iodide those exemplified in the swelling step can be used.
  • it is potassium iodide.
  • the standard electrode potential of the anion or cation is preferably higher than the standard electrode potential (0.536 V) of iodine ion.
  • the standard electrode potential of the anion or cation is preferably 0.55 V or more, more preferably 0.60 V or more. This is because it can suitably function as an oxidizing agent.
  • the standard electrode potential of the anion or cation is, for example, 2.00 V or less.
  • anion or cation examples include Fe 3+ (0.771 V), Ag + (0.7991 V), Ag 2+ (1.980 V), Au + (1.83 V), Au 3+ (1.52 V), and Co. Cations such as 3+ (1.92 V), Cu 2+ (0.559 V), Mn 3+ (1.5 V), Pt 2+ (1.188 V), Br 3 ⁇ (1.0503 V), ClO 3 ⁇ (0.622 V) ), ClO 2 ⁇ (0.681 V), ClO ⁇ (0.890 V), Cr 2 O 7 2 ⁇ (1.36 V), NO 3 ⁇ (0.835 V, 0.94 V, 0.9557 V), MnO 4 - (0.56 V) and the like.
  • the standard electrode potential refers to a value in an aqueous solution at a standard pressure of 1 atm and 25 ° C.
  • the standard electrode potential in an aqueous solution at a standard pressure of 1 atm and 25 ° C. is described in, for example, Maruzen Publishing Co., Ltd., published by Electrochemical Handbook, 6th edition, edited by The Electrochemical Society. In this specification, the values described in the above-mentioned electrochemical handbook are used.
  • the oxidizing agent is not particularly limited as long as it is an ionic compound in which an electrode reaction attaining a desired standard electrode potential occurs in a staining solution, and any appropriate compound can be used.
  • compounds containing Fe 3+ as a cation such as ferric sulfate, ferric chloride, and ferric nitrate; compounds containing MnO 4 ⁇ as an anion such as potassium permanganate; Cu 2+ such as copper chloride and copper sulfate; And the like as a cation. Since it contains Fe 3+ , it is preferable to use at least one compound selected from the group consisting of ferric sulfate, ferric chloride, and ferric nitrate.
  • the oxidizing agent may be used alone or in combination of two or more.
  • the content of the oxidizing agent in the dyeing solution is preferably 0.1 to 10 parts by weight, more preferably 0.5 to 4 parts by weight, based on 100 parts by weight of the solvent.
  • the content of the oxidizing agent in the staining solution can be determined according to the content of iodide contained in the staining solution.
  • the molar ratio between iodide and the oxidizing agent can be set to any appropriate value, for example, 2/1 to 50/1, and preferably 10/1 to 50/1.
  • the oxidizing agent can sufficiently function as an oxidizing agent for iodine ions.
  • any appropriate solvent can be used, and usually, water is used.
  • the dyeing solution may contain any other appropriate compound in addition to the iodide and the oxidizing agent.
  • the staining solution may further include iodine.
  • the iodine content in the staining solution is, for example, 1 part by weight or less based on 100 parts by weight of the solvent.
  • the dyeing solution contains no oxidizing agent, the iodine content is, for example, 1 part by weight to 10 parts by weight based on 100 parts by weight of the solvent.
  • Examples of the dyeing method include a method of dipping a PVA-based resin film in the dyeing solution, a method of coating the PVA-based resin film with the dyeing solution, and a method of spraying the dyeing solution on the PVA-based resin film.
  • the method is preferably a method in which a PVA-based resin film is immersed in a dyeing solution because it can be dyed well.
  • the temperature of the dyeing solution at the time of dyeing can be set to any appropriate value, for example, 20 ° C to 50 ° C.
  • the immersion time is, for example, 1 second to 1 minute.
  • a boron compound is usually used as a crosslinking agent.
  • the boron compound include boric acid and borax. Preferably, it is boric acid.
  • the boron compound is usually used in the form of an aqueous solution.
  • the concentration of boric acid in the aqueous boric acid solution is, for example, 0.5% by weight to 15% by weight, and preferably 1% by weight to 5% by weight.
  • the boric acid aqueous solution may further contain an iodide such as potassium iodide and a zinc compound such as zinc sulfate and zinc chloride.
  • the crosslinking step can be performed by any appropriate method.
  • a method of immersing a PVA-based resin film in an aqueous solution containing a boron compound a method of applying an aqueous solution containing a boron compound to a PVA-based resin film, or a method of spraying an aqueous solution containing a boron compound onto a PVA-based resin film are mentioned.
  • the temperature of the solution used for crosslinking is, for example, 25 ° C or higher, preferably 30 ° C to 85 ° C, more preferably 40 ° C to 70 ° C.
  • the immersion time is, for example, 5 seconds to 800 seconds, preferably 8 seconds to 500 seconds.
  • washing step is performed using water or an aqueous solution containing the above iodide. Typically, this is performed by immersing a PVA-based resin film in an aqueous potassium iodide solution.
  • the temperature of the aqueous solution in the washing step is, for example, 5 ° C. to 50 ° C.
  • the immersion time is, for example, 1 second to 300 seconds.
  • the drying step can be performed by any appropriate method. For example, natural drying, blast drying, drying under reduced pressure, heating drying and the like can be mentioned, and heating drying is preferably used.
  • the heating temperature is, for example, 30 ° C. to 100 ° C.
  • the drying time is, for example, 10 seconds to 10 minutes.
  • the protective film 20 is composed of any appropriate film that can be used as a protective film for a polarizer.
  • the material that is a main component of the film include a cellulosic resin such as triacetyl cellulose (TAC), polyester, polyvinyl alcohol, polycarbonate, polyamide, polyimide, polyethersulfone, and polysulfone.
  • a transparent resin such as polystyrene, polynorbornene, polyolefin, (meth) acrylic, and acetate.
  • a thermosetting resin such as (meth) acrylic, urethane, (meth) acrylic urethane, epoxy, silicone and the like, or an ultraviolet curable resin may also be used.
  • a glassy polymer such as a siloxane-based polymer may also be used.
  • a polymer film described in JP-A-2001-343529 (WO 01/37007) can also be used.
  • a resin composition containing a thermoplastic resin having a substituted or unsubstituted imide group in a side chain and a thermoplastic resin having a substituted or unsubstituted phenyl group and a nitrile group in a side chain for example, a resin composition having an alternating copolymer of isobutene and N-methylmaleimide and an acrylonitrile / styrene copolymer.
  • the polymer film may be, for example, an extruded product of the resin composition.
  • a resin substrate used in the production of a polarizing plate may be used as it is as a protective film.
  • the protective film may be subjected to a surface treatment such as a hard coat treatment, an anti-reflection treatment, an anti-sticking treatment, and an anti-glare treatment as necessary. Further, a brightness enhancement film such as a reflective polarizer may be used as the protective film.
  • the thickness of the protective film any appropriate thickness can be adopted as long as the effects of the present invention can be obtained.
  • the thickness of the protective film is, for example, 20 ⁇ m to 60 ⁇ m.
  • the thickness of the protective film is a thickness including the thickness of the surface treatment layer.
  • the lower limit of the moisture permeability for example, 0.01g / m 2 / 24hr, and preferably below the detection limit.
  • the polarizer can be well protected from moisture and oxygen in the air by disposing the pressure-sensitive adhesive layer preferably adjacent to the polarizer.
  • the optical characteristics of the polarizing plate can be maintained even in a high temperature and high humidity environment, and the durability of the polarizing plate can be improved. More specifically, it is possible to obtain a polarizing plate in which color loss in the absorption axis direction is significantly suppressed in a high-temperature and high-humidity environment.
  • the moisture permeability can be measured according to JIS Z0208.
  • the gel fraction of the pressure-sensitive adhesive layer is preferably 10% to 98%, more preferably 25% to 98%, still more preferably 45% to 90%, and particularly preferably 60% to 85%. is there. When the gel fraction is within such a range, both durability and adhesive strength can be achieved.
  • the thickness of the pressure-sensitive adhesive layer is, for example, 10 ⁇ m to 100 ⁇ m, preferably 15 ⁇ m to 70 ⁇ m, and more preferably 20 ⁇ m to 55 ⁇ m. With such a thickness, desired moisture permeability can be achieved.
  • the pressure-sensitive adhesive layer can be made of any appropriate material as long as the above-mentioned properties can be satisfied.
  • the constituent material is typically a rubber-based pressure-sensitive adhesive composition, and more specifically, may be an active energy ray-crosslinkable rubber-based pressure-sensitive adhesive composition containing polyisobutylene.
  • the components of the rubber-based pressure-sensitive adhesive composition will be described.
  • Polyisobutylene and other polymer components Polyisobutylene is a homopolymer of isobutylene, and a commercially available product such as OPPANOL manufactured by BASF can be used. In the embodiment of the present invention, since polyisobutylene containing no double bond in the main chain is used, a pressure-sensitive adhesive layer having excellent weather resistance can be formed.
  • the weight average molecular weight (Mw) of polyisobutylene is preferably 100,000 or more, more preferably 300,000 or more, further preferably 600,000 or more, and particularly preferably 700,000 or more. On the other hand, the weight average molecular weight is preferably 5,000,000 or less, more preferably 3,000,000 or less, and further preferably 2,000,000 or less.
  • the content of polyisobutylene in the rubber-based pressure-sensitive adhesive composition is preferably 50% by weight or more, more preferably 60% by weight or more, and further preferably 70% by weight, based on the total solid content of the rubber-based pressure-sensitive adhesive composition. %, Particularly preferably at least 80% by weight, particularly preferably at least 85% by weight, most preferably at least 90% by weight.
  • the content of polyisobutylene is preferably 99% by weight or less, more preferably 98% by weight or less.
  • the rubber-based pressure-sensitive adhesive composition may contain a polymer component (typically, a polymer or an elastomer) other than polyisobutylene, depending on the purpose and desired characteristics.
  • a polymer component typically, a polymer or an elastomer
  • Specific examples include copolymers of isobutylene and normal butylene, copolymers of isobutylene and isoprene (for example, butyl rubbers such as regular butyl rubber, chlorinated butyl rubber, brominated butyl rubber, and partially cross-linked butyl rubber), and vulcanization thereof.
  • modified products eg, those modified with a functional group such as a hydroxyl group, a carboxyl group, an amino group, or an epoxy group
  • SEBS styrene-ethylene-butylene-styrene block copolymer
  • SIS styrene-isoprene -Styrene block copolymer
  • SBS styrene-butadiene-styrene block copolymer
  • SEPS styrene-ethylene-propylene-styrene block copolymer
  • SEP styrene Hydrogenated isoprene block copolymer
  • styrene-based thermoplastic elastomers such as styrene-based block copolymers such as styrene-isobutylene-styrene block copolymer (SIBS) and
  • Hydrogen abstraction type photopolymerization initiator The hydrogen abstraction type photopolymerization initiator, by irradiating with active energy rays, generates a reaction point by extracting hydrogen from polyisobutylene without cleavage itself, and the reaction point To initiate a crosslinking reaction of polyisobutylene.
  • hydrogen abstraction type photopolymerization initiator examples include, for example, acetophenone, benzophenone, methyl-4-phenylbenzophenone o-benzoylbenzoate, 4,4′-dichlorobenzophenone, hydroxybenzophenone, 4,4′-dimethoxybenzophenone, 4,4 '-Dichlorobenzophenone, 4,4'-dimethylbenzophenone, 4-benzoyl-4'-methyl-diphenylsulfide, acrylated benzophenone, 3,3', 4,4'-tetra (t-butylperoxycarbonyl) benzophenone, Benzophenone-based compounds such as 3,3'-dimethyl-4-methoxybenzophenone; thioxane such as 2-isopropylthioxanthone, 2,4-dimethylthioxanthone, 2,4-diethylthioxanthone and 2,4-dichlorothioxanthone Amin
  • the content of the hydrogen abstraction type photopolymerization initiator is preferably 0.001 to 10 parts by weight, more preferably 0.005 to 10 parts by weight, based on 100 parts by weight of polyisobutylene. More preferably, it is 0.01 to 10 parts by weight.
  • the content of the hydrogen abstraction type photopolymerization initiator is in such a range, the crosslinking reaction can proceed to a target density.
  • the rubber-based pressure-sensitive adhesive composition may further contain a polyfunctional radical polymerizable compound.
  • the polyfunctional radically polymerizable compound can function as a crosslinking agent for polyisobutylene.
  • the polyfunctional radical polymerizable compound is a compound having at least two radical polymerizable functional groups having an unsaturated double bond such as a (meth) acryloyl group or a vinyl group.
  • Specific examples of the polyfunctional radical polymerizable compound include, for example, tripropylene glycol di (meth) acrylate, tetraethylene glycol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, 1,9-nonanediol Di (meth) acrylate, 1,10-decanediol di (meth) acrylate, 2-ethyl-2-butylpropanediol di (meth) acrylate, bisphenol A di (meth) acrylate, bisphenol A ethylene oxide adduct ) Acrylate, bisphenol A propylene oxide adduct di (meth) acrylate, bisphenol A diglycidyl ether di (meth) acrylate,
  • the content of the polyfunctional radical polymerizable compound is preferably 20 parts by weight or less, more preferably 15 parts by weight or less, and still more preferably 10 parts by weight or less based on 100 parts by weight of polyisobutylene.
  • the content of the polyfunctional radically polymerizable compound is preferably at least 0.1 part by weight, more preferably at least 0.5 part by weight, further preferably at least 1 part by weight, based on 100 parts by weight of polyisobutylene. Parts or more.
  • the molecular weight of the polyfunctional radically polymerizable compound is, for example, 1000 or less, and preferably 500 or less.
  • the rubber-based pressure-sensitive adhesive composition may further include a tackifier.
  • a tackifier By including a tackifier, it is possible to form a pressure-sensitive adhesive layer having high adhesion to an adherend (for example, a polarizer or a protective film) and having high durability even in a high-temperature environment. it can.
  • Specific examples of the tackifier include a tackifier having a terpene skeleton, a tackifier having a rosin skeleton, and hydrogenated products thereof.
  • tackifier containing a terpene skeleton examples include terpene polymers such as ⁇ -pinene polymer, ⁇ -pinene polymer, and dipentene polymer, and modified terpene polymers (phenol-modified, styrene-modified, and aromatic-modified). , Hydrogenation modification, hydrocarbon modification, etc.).
  • modified terpene resin examples include a terpene phenol resin, a styrene-modified terpene resin, an aromatic-modified terpene resin, and a hydrogenated terpene resin (hydrogenated terpene resin).
  • the hydrogenated terpene resin includes hydrides of terpene polymers and other modified terpene resins and hydrogenated terpene phenol resins.
  • hydrogenated terpene phenol resins are preferable from the viewpoint of compatibility with the rubber-based pressure-sensitive adhesive composition and pressure-sensitive adhesive properties.
  • Examples of the tackifier having a rosin skeleton include a rosin resin, a polymerized rosin resin, a hydrogenated rosin resin, a rosin ester resin, a hydrogenated rosin ester resin, and a rosin phenol resin.
  • unmodified rosins such as gum rosin, wood rosin, tall oil rosin, hydrogenated, disproportionated, polymerized, and other chemically modified rosins, and derivatives thereof. Can be used.
  • the tackifier When the tackifier is a hydrogenated product, it may be a partially hydrogenated partially hydrogenated product or a completely hydrogenated product in which all double bonds in the compound are hydrogenated. You may. From the viewpoints of adhesive properties, weather resistance, and hue, completely hydrogenated products are preferred.
  • the tackifier preferably contains a cyclohexanol skeleton from the viewpoint of the adhesive property. Although the detailed principle is unknown, it is considered that the cyclohexanol skeleton can balance the compatibility with the base polymer polyisobutylene more than the phenol skeleton.
  • a hydrogenated product such as a terpene phenol resin or a rosin phenol resin is preferable, and a completely hydrogenated product such as a terpene phenol resin or a rosin phenol resin is more preferable.
  • the softening point (softening temperature) of the tackifier is preferably 80 ° C or higher, more preferably 100 ° C or higher.
  • the softening point of the tackifier is preferably 200 ° C. or lower, more preferably 180 ° C. or lower.
  • the softening point of the tackifier resin is defined as a value measured by a softening point test method (ring and ball method) specified in either JIS K5902 or JIS K2207.
  • the weight average molecular weight (Mw) of the tackifier is preferably 50,000 or less, more preferably 30,000 or less, further preferably 10,000 or less, particularly preferably 8,000 or less, and particularly preferably 5,000 or less. It is as follows. On the other hand, the weight average molecular weight of the tackifier is preferably 500 or more, more preferably 1000 or more, and still more preferably 2000 or more. When the weight-average molecular weight of the tackifier is in such a range, the compatibility with polyisobutylene is good, and problems such as whitening can be suppressed.
  • the amount of the tackifier is preferably 40 parts by weight or less, more preferably 30 parts by weight or less, and further preferably 20 parts by weight or less based on 100 parts by weight of polyisobutylene.
  • the addition amount of the tackifier is preferably at least 0.1 part by weight, more preferably at least 1 part by weight, further preferably at least 5 parts by weight. When the content of the tackifier is in such a range, desired adhesive properties can be achieved.
  • the rubber-based pressure-sensitive adhesive composition may contain a tackifier other than the above-mentioned tackifier.
  • the tackifier include petroleum resin-based tackifiers.
  • petroleum tackifiers include aromatic petroleum resins, aliphatic petroleum resins, alicyclic petroleum resins (aliphatic cyclic petroleum resins), aliphatic / aromatic petroleum resins, and aliphatic / alicyclic rings Group petroleum resins, hydrogenated petroleum resins, cumarone resins, and cumarone indene resins.
  • the petroleum resin-based tackifier can be used in a proportion of, for example, 30 parts by weight or less based on 100 parts by weight of polyisobutylene.
  • the rubber-based pressure-sensitive adhesive composition may contain any appropriate additive other than the above.
  • additives include diluents (eg, organic solvents such as toluene, xylene, n-heptane, and dimethyl ether), softeners, cross-linking agents (eg, polyisocyanates, epoxy compounds, alkyl etherified melamine compounds), and fillers.
  • the type, combination, addition amount, and the like of the additives added to the rubber-based pressure-sensitive adhesive composition can be appropriately set according to the purpose.
  • the content (total amount) of additives in the rubber-based pressure-sensitive adhesive composition is preferably 30% by weight or less, more preferably 20% by weight or less, and even more preferably 10% by weight or less.
  • the pressure-sensitive adhesive layer can be formed by irradiating the rubber-based pressure-sensitive adhesive composition with active energy rays to crosslink polyisobutylene. The specific procedure is as follows.
  • the pressure-sensitive adhesive layer can be formed directly on the polarizer or the protective film surface.
  • a rubber-based pressure-sensitive adhesive composition is applied to the polarizer surface of the protective film 20 / polarizer 10 laminate.
  • Any appropriate method can be adopted as the application method. Specific examples include roll coat, kiss roll coat, gravure coat, reverse coat, roll brush, spray coat, dip roll coat, bar coat, knife coat, air knife coat, curtain coat, lip coat, extrusion coat with a die coater, etc. Law.
  • the coating layer is dried if necessary.
  • volatile components for example, diluent
  • the drying temperature can be set appropriately according to the purpose and the drying time.
  • the drying temperature is, for example, 30 ° C to 90 ° C, preferably 60 ° C to 80 ° C.
  • the drying time can be appropriately set according to the purpose and the drying temperature.
  • the drying time is, for example, 5 seconds to 20 minutes, preferably 30 seconds to 10 minutes, and more preferably 1 minute to 8 minutes.
  • the dried coating layer is irradiated with active energy rays as needed.
  • active energy ray examples include visible light, ultraviolet light, and electron beam. Ultraviolet light is preferred.
  • the irradiation conditions of the ultraviolet ray can be set to any appropriate conditions depending on the composition of the rubber-based pressure-sensitive adhesive composition, desired characteristics of the pressure-sensitive adhesive layer, and the like.
  • the integrated amount of irradiation of ultraviolet rays is preferably 100 mJ / cm 2 to 2000 mJ / cm 2 .
  • the pressure-sensitive adhesive layer may be transferred to a polarizer surface after being formed on any appropriate support.
  • a typical example of the support is a separator. The procedure for forming the pressure-sensitive adhesive on the support is as described above.
  • the pressure-sensitive adhesive layer can be formed.
  • the polarizing plate according to the embodiment of the present invention is suitably used for an image display device.
  • the image display device include a liquid crystal display device, an organic electroluminescence (EL) display device, and a quantum dot display device.
  • EL organic electroluminescence
  • the thickness of the polarizer was measured using a spectral thickness meter (trade name “MCPD-3000” manufactured by Otsuka Electronics Co., Ltd.). The thickness of the components other than the polarizer in the polarizing plate was measured using a digital micrometer (KC-351C manufactured by Anritsu Corporation).
  • KC-351C manufactured by Anritsu Corporation.
  • One of the release liners of the pressure-sensitive adhesive sheet is peeled off to expose the pressure-sensitive adhesive surface, and the pressure-sensitive adhesive sheet is bonded to a triacetyl cellulose film (TAC film, thickness: 25 ⁇ m, manufactured by Konica Minolta Co., Ltd.) through the pressure-sensitive adhesive surface, and 10 cm ⁇ Was cut out in a circle.
  • TAC film triacetyl cellulose film
  • 10 cm ⁇ was cut out in a circle.
  • the other release liner was peeled off to obtain a sample for measurement.
  • the moisture permeability (water vapor permeability) of the obtained measurement sample was measured by a moisture permeability test method (cup method, according to JIS Z 0208).
  • the measurement conditions were as follows. A constant temperature and humidity chamber was used for the measurement.
  • Ts 0 the single transmittance before heating and humidification
  • Ts 500 the single transmittance after heating and humidification.
  • the obtained rubber-based pressure-sensitive adhesive composition (solution) is applied to a release-treated surface of a separator (a 38 ⁇ m-thick polyester film having one surface peeled with silicone, trade name “Diafoil MRF”, manufactured by Mitsubishi Plastics, Inc.). Thus, a coating layer was formed. Next, the coating layer was dried at 80 ° C. for 3 minutes to form a rubber-based pressure-sensitive adhesive layer having a thickness of 25 ⁇ m. Next, ultraviolet light was irradiated from the pressure-sensitive adhesive layer side at room temperature to crosslink the polyisobutylene. Ultraviolet irradiation was performed at a light quantity of 1,000 mJ / cm 2 in the UVA region. Thus, a pressure-sensitive adhesive sheet having a separator / pressure-sensitive adhesive layer (thickness: 25 ⁇ m) was obtained. Moisture permeability of the adhesive layer was 24g / m 2 / 24hr.
  • Example 1 An amorphous isophthalic acid copolymerized polyethylene terephthalate (IPA copolymerized PET) film (thickness: 100 ⁇ m) having a water absorption of 0.75% and a Tg of 75 ° C. was used as a thermoplastic resin substrate.
  • One surface of the substrate is subjected to a corona treatment, and the corona-treated surface is treated with polyvinyl 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).
  • a degree of saponification of 99.0 mol% or more, and an aqueous solution containing 9: 1 ratio of trade name “Gosefimer Z200” manufactured by Nippon Synthetic Chemical Industry Co., Ltd.) is applied and dried at 25 ° C.
  • a PVA-based resin layer was formed to produce a laminate.
  • the obtained laminate was stretched 4.5 times in the air at 140 ° C. in a direction orthogonal to the longitudinal direction of the laminate using a tenter stretching machine (stretching treatment).
  • the laminate was immersed in an insolubilizing bath at a liquid temperature of 30 ° C. (a boric acid aqueous solution obtained by mixing 4 parts by weight of boric acid with 100 parts by weight of water) for 30 seconds.
  • the laminate was added to a dyeing solution at 30 ° C. (an aqueous solution obtained by adding 6.0 parts by weight of potassium iodide and 0.8 parts by weight of ferric sulfate n-hydrate to 100 parts by weight of water) for 30 seconds. Dipped and stained. Next, it was immersed in a crosslinking bath at a liquid temperature of 60 ° C. (a boric acid aqueous solution obtained by mixing 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 35 seconds. . Thereafter, the laminate was immersed in a washing bath at a liquid temperature of 25 ° C.
  • Example 2 A 7 ⁇ m-thick PVA-based resin layer was formed to form a laminate, and the dyeing solution was prepared by mixing 15.0 parts by weight of potassium iodide and 2.0 parts by weight of ferric sulfate n-hydrate with respect to 100 parts by weight of water.
  • the dyeing solution was prepared by mixing 15.0 parts by weight of potassium iodide and 2.0 parts by weight of ferric sulfate n-hydrate with respect to 100 parts by weight of water.
  • the aqueous solution to which was added was obtained a polarizing plate of Example 2 having a PVA-based resin layer (polarizer) having a thickness of 1.5 ⁇ m.
  • the obtained polarizing plate was subjected to the same evaluation as in the examples. Table 1 shows the results.
  • Example 3 The procedure of Example 2 was repeated except that the dyeing solution was an aqueous solution obtained by adding 3.8 parts by weight of potassium iodide and 0.5 parts by weight of ferric sulfate n-hydrate to 100 parts by weight of water.
  • Example 4 A 6 ⁇ m-thick PVA-based resin layer was formed to form a laminate, and a dyeing solution was prepared by adding 12.0 parts by weight of potassium iodide and 1.0 part by weight of solid iodine to 100 parts by weight of water.
  • a polarizing plate of Example 4 having a PVA-based resin layer (polarizer) having a thickness of 1.2 ⁇ m was obtained in the same manner as in Example 1 except for performing the above. The obtained polarizing plate was subjected to the same evaluation as in the examples. Table 1 shows the results.
  • Example 5 In the same manner as in Example 1, a 11 ⁇ m-thick PVA-based resin layer was formed on a thermoplastic resin base material to produce a laminate. The obtained laminate was uniaxially stretched 2.0 times in the longitudinal direction between rolls having different peripheral speeds in an oven at 115 ° C. Next, the laminate was immersed in an insolubilizing bath at a liquid temperature of 30 ° C. (a boric acid aqueous solution obtained by mixing 3 parts by weight of boric acid with 100 parts by weight of water) for 30 seconds. Next, the laminate was added to a dyeing solution at 30 ° C.
  • the laminate was immersed in a boric acid aqueous solution (aqueous solution obtained by blending 4 parts by weight of boric acid and 5 parts by weight of potassium iodide with respect to 100 parts by weight of water) at a liquid temperature of 70 ° C. Uniaxial stretching was performed 2.7 times in the longitudinal direction between rolls having different speeds. Thereafter, the laminate is immersed in a washing bath at a liquid temperature of 30 ° C. (an aqueous solution obtained by blending 4 parts by weight of potassium iodide with respect to 100 parts by weight of water) for 10 seconds, and then immersed in hot air at 60 ° C. for 60 seconds. Dried for seconds.
  • a boric acid aqueous solution aqueous solution obtained by blending 4 parts by weight of boric acid and 5 parts by weight of potassium iodide with respect to 100 parts by weight of water
  • a laminate 5 having a 5 ⁇ m-thick PVA-based resin layer (polarizer) on the resin substrate was obtained.
  • the pressure-sensitive adhesive layer was transferred from the pressure-sensitive adhesive sheet of Production Example 1 to the polarizer surface to obtain a polarizing plate of Example 5.
  • the obtained polarizing plate was subjected to the same evaluation as in the examples. Table 1 shows the results.
  • Comparative Example 1 Ordinary acrylic pressure-sensitive adhesive except for forming an adhesive layer by using a (thickness 25 [mu] m, moisture permeability 1400g / m 2 / 24hr) in the same manner as in Example 1 to obtain a polarizing plate of Comparative Example 1. The obtained polarizing plate was subjected to the same evaluation as in the examples. Table 1 shows the results.
  • the polarizing plate of the present invention is suitably used for an image display device.
  • the image display device include a liquid crystal display device, an organic electroluminescence (EL) display device, and a quantum dot display device.
  • EL organic electroluminescence
  • Such an image display device is suitably used for a television, a mobile phone, a portable information terminal, a digital camera, a video camera, a portable game machine, a car navigation, a copier, a printer, a facsimile, a clock, a microwave oven, and the like.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Polarising Elements (AREA)
PCT/JP2019/030356 2018-10-02 2019-08-01 偏光板 WO2020070962A1 (ja)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2020549988A JPWO2020070962A1 (ja) 2018-10-02 2019-08-01 偏光板
KR1020217007826A KR20210071956A (ko) 2018-10-02 2019-08-01 편광판
CN201980064681.9A CN112867947A (zh) 2018-10-02 2019-08-01 偏光板

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2018187237 2018-10-02
JP2018-187237 2018-10-02

Publications (1)

Publication Number Publication Date
WO2020070962A1 true WO2020070962A1 (ja) 2020-04-09

Family

ID=70055490

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2019/030356 WO2020070962A1 (ja) 2018-10-02 2019-08-01 偏光板

Country Status (5)

Country Link
JP (1) JPWO2020070962A1 (ko)
KR (1) KR20210071956A (ko)
CN (1) CN112867947A (ko)
TW (1) TW202027990A (ko)
WO (1) WO2020070962A1 (ko)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022004137A1 (ja) * 2020-07-03 2022-01-06 住友化学株式会社 粘着剤層付き偏光板
WO2022004138A1 (ja) * 2020-07-03 2022-01-06 住友化学株式会社 粘着剤層付き偏光板
WO2023112533A1 (ja) * 2021-12-17 2023-06-22 三菱瓦斯化学株式会社 偏光シート

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006201401A (ja) * 2005-01-19 2006-08-03 Sharp Corp 液晶表示装置
JP2013011837A (ja) * 2010-09-03 2013-01-17 Nitto Denko Corp 薄型偏光膜、薄型偏光膜を有する光学積層体、および薄型偏光膜の製造方法
JP2015052765A (ja) * 2013-09-09 2015-03-19 日東電工株式会社 透明導電膜用粘着剤層付偏光フィルム、積層体、及び、画像表示装置
JP2016035579A (ja) * 2014-08-04 2016-03-17 日東電工株式会社 偏光板
JP2017058519A (ja) * 2015-09-16 2017-03-23 日東電工株式会社 粘着剤層付偏光フィルム、光学部材、及び画像表示装置
JP2017119847A (ja) * 2015-12-25 2017-07-06 日東電工株式会社 ゴム系粘着剤組成物、ゴム系粘着剤層、ゴム系粘着剤層付光学フィルム、光学部材、画像表示装置、及びゴム系粘着剤層の製造方法
JP2018039863A (ja) * 2016-09-05 2018-03-15 日東電工株式会社 ゴム系粘着剤組成物、ゴム系粘着剤層、粘着フィルム、ゴム系粘着剤層付光学フィルム、光学部材、及び画像表示装置

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4691615B2 (ja) * 2009-02-17 2011-06-01 シャープ株式会社 液晶表示装置
JP5048120B2 (ja) 2010-03-31 2012-10-17 住友化学株式会社 偏光性積層フィルムの製造方法、および偏光板の製造方法
JP4975186B1 (ja) * 2010-12-16 2012-07-11 日東電工株式会社 偏光膜の製造方法
JP2013156391A (ja) 2012-01-30 2013-08-15 Konica Minolta Inc ロール状円偏光板の製造方法、有機エレクトロルミネッセンス表示装置及び横電界型スイッチングモード型液晶表示装置
JP5860449B2 (ja) * 2013-11-14 2016-02-16 日東電工株式会社 偏光膜および偏光膜の製造方法
JP6684043B2 (ja) * 2014-12-24 2020-04-22 日東電工株式会社 コーティング層付偏光フィルム、粘着剤層付偏光フィルム、及び画像表示装置
JP5943444B2 (ja) * 2015-05-21 2016-07-05 日東電工株式会社 偏光膜および偏光膜の製造方法
JP2018072712A (ja) * 2016-11-02 2018-05-10 日東電工株式会社 偏光板

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006201401A (ja) * 2005-01-19 2006-08-03 Sharp Corp 液晶表示装置
JP2013011837A (ja) * 2010-09-03 2013-01-17 Nitto Denko Corp 薄型偏光膜、薄型偏光膜を有する光学積層体、および薄型偏光膜の製造方法
JP2015052765A (ja) * 2013-09-09 2015-03-19 日東電工株式会社 透明導電膜用粘着剤層付偏光フィルム、積層体、及び、画像表示装置
JP2016035579A (ja) * 2014-08-04 2016-03-17 日東電工株式会社 偏光板
JP2017058519A (ja) * 2015-09-16 2017-03-23 日東電工株式会社 粘着剤層付偏光フィルム、光学部材、及び画像表示装置
JP2017119847A (ja) * 2015-12-25 2017-07-06 日東電工株式会社 ゴム系粘着剤組成物、ゴム系粘着剤層、ゴム系粘着剤層付光学フィルム、光学部材、画像表示装置、及びゴム系粘着剤層の製造方法
JP2018039863A (ja) * 2016-09-05 2018-03-15 日東電工株式会社 ゴム系粘着剤組成物、ゴム系粘着剤層、粘着フィルム、ゴム系粘着剤層付光学フィルム、光学部材、及び画像表示装置

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022004137A1 (ja) * 2020-07-03 2022-01-06 住友化学株式会社 粘着剤層付き偏光板
WO2022004138A1 (ja) * 2020-07-03 2022-01-06 住友化学株式会社 粘着剤層付き偏光板
WO2023112533A1 (ja) * 2021-12-17 2023-06-22 三菱瓦斯化学株式会社 偏光シート

Also Published As

Publication number Publication date
TW202027990A (zh) 2020-08-01
CN112867947A (zh) 2021-05-28
KR20210071956A (ko) 2021-06-16
JPWO2020070962A1 (ja) 2021-09-02

Similar Documents

Publication Publication Date Title
JP6860666B2 (ja) 偏光板
JP6940930B2 (ja) 有機ｅｌ表示装置用光学フィルム、有機ｅｌ表示装置用偏光フィルム、有機ｅｌ表示装置用粘着剤層付き偏光フィルム、及び有機ｅｌ表示装置
KR102339532B1 (ko) 고무계 점착제 조성물, 고무계 점착제층, 점착 필름, 고무계 점착제층을 구비한 광학 필름, 광학 부재 및 화상 표시 장치
WO2020070962A1 (ja) 偏光板
JP2021101249A (ja) 粘着剤層付偏光フィルム、光学部材、及び画像表示装置
JP2009008860A (ja) 偏光板の製造方法、偏光板、光学フィルムおよび画像表示装置
JP4726145B2 (ja) 偏光板用接着剤、偏光板、その製造方法、光学フィルムおよび画像表示装置
JP7348986B2 (ja) 偏光子保護用樹脂組成物および該組成物から形成された保護層を備える偏光板
JP6873682B2 (ja) ゴム系粘着剤組成物、ゴム系粘着剤層、ゴム系粘着剤層付光学フィルム、光学部材、画像表示装置、及びゴム系粘着剤層の製造方法
TW201939078A (zh) 偏光板及使用該偏光板的圖像顯示裝置
WO2017110913A1 (ja) ゴム系粘着剤組成物、ゴム系粘着剤層、ゴム系粘着剤層付光学フィルム、光学部材、画像表示装置、及びゴム系粘着剤層の製造方法
WO2019176719A1 (ja) 積層体、複合偏光板および画像表示装置
KR20200129150A (ko) 적층체, 복합 편광판 및 화상 표시 장치
JP7369777B2 (ja) 偏光子保護用樹脂組成物および該組成物から形成された保護層を備える偏光板
JP7297642B2 (ja) 偏光子保護用樹脂組成物および該組成物から形成された保護層を備える偏光板
WO2020213494A1 (ja) 光学積層体及び画像表示装置
CN115735143A (zh) 带粘合剂层的偏振板
WO2019176718A1 (ja) 偏光板およびそれを用いた画像表示装置
JP2008129211A (ja) 光学フィルム、偏光板及び画像表示装置

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 19868613

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 2020549988

Country of ref document: JP

Kind code of ref document: A

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 19868613

Country of ref document: EP

Kind code of ref document: A1