WO2023189796A1 - Empilement de films polarisants et dispositif d'affichage d'images - Google Patents

Empilement de films polarisants et dispositif d'affichage d'images Download PDF

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Publication number
WO2023189796A1
WO2023189796A1 PCT/JP2023/010807 JP2023010807W WO2023189796A1 WO 2023189796 A1 WO2023189796 A1 WO 2023189796A1 JP 2023010807 W JP2023010807 W JP 2023010807W WO 2023189796 A1 WO2023189796 A1 WO 2023189796A1
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Prior art keywords
film
polarizing film
resin film
polarizing
resin
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PCT/JP2023/010807
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English (en)
Japanese (ja)
Inventor
慎太朗 三木
勝則 高田
亮 菅野
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日東電工株式会社
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Publication of WO2023189796A1 publication Critical patent/WO2023189796A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements

Definitions

  • the present invention relates to a polarizing film laminate and an image display device.
  • polarizing films used in various image display devices such as liquid crystal display devices and organic EL display devices have been dyed (using iodine, dichroic dyes, etc.) because they have both high transmittance and high degree of polarization.
  • a polyvinyl alcohol film (containing a dichroic substance) is used.
  • the polarizing film is manufactured by subjecting a polyvinyl alcohol film to various treatments such as swelling, dyeing, crosslinking, and stretching in a bath, followed by washing and drying.
  • the polarizing film is usually used as a polarizing film (polarizing plate) in which a transparent protective film such as triacetyl cellulose is bonded to one or both sides of the polarizing film using an adhesive.
  • the polarizing film is used as a polarizing film laminate (optical film) by laminating other resin films such as an optical layer, if necessary. Furthermore, as the above-mentioned polarizing film (polarizing plate), there is also known a polarizing film in which a polarizing film and a transparent protective film are directly laminated without using an adhesive layer or a pressure-sensitive adhesive layer (Patent Document 1-4).
  • an object of the present invention is to provide a polarizing film laminate that has excellent crack resistance and adhesion against repeated bending.
  • Another object of the present invention is to provide an image display device having the above polarizing film laminate.
  • the present invention provides a polarizing film laminate in which a polarizing film, a first resin film, and a second resin film are provided in this order, wherein the polarizing film has a thickness of 20 ⁇ m or less, and the polarizing film has a thickness of 20 ⁇ m or less, and
  • the present invention relates to a polarizing film laminate in which the resin film and the second resin film are directly bonded.
  • the present invention also relates to an image display device having the polarizing film laminate.
  • polarizing film laminate of the present invention a polarizing film, a first resin film, and a second resin film are provided in this order, and the polarizing film has a thickness of 20 ⁇ m or less, and the first resin film Since the resin film and the second resin film are directly bonded, the stress and strain at the interface between the resin films are small, resulting in excellent crack resistance and adhesion against repeated bending.
  • the polarizing film laminate of the present invention is provided with a polarizing film, a first resin film, and a second resin film in this order, and the polarizing film has a thickness of 20 ⁇ m or less, The first resin film and the second resin film are directly joined.
  • the polarizing film is formed by adsorbing and aligning a dichroic substance such as iodine or a dichroic dye onto a polyvinyl alcohol film.
  • the polarizing film is preferably an iodine-based polarizing film containing iodine as the dichroic substance from the viewpoint of initial polarization performance of the polarizing film.
  • the polyvinyl alcohol (PVA)-based film can be used without any particular restriction, as long as it has transparency in the visible light region and disperses and adsorbs dichroic substances such as iodine and dichroic dyes.
  • the material for the polyvinyl alcohol film include polyvinyl alcohol or derivatives thereof.
  • the polyvinyl alcohol derivatives include polyvinyl formal, polyvinyl acetal; olefins such as ethylene and propylene; unsaturated carboxylic acids such as acrylic acid, methacrylic acid, and crotonic acid, and those modified with their alkyl esters, acrylamide, etc. can be mentioned.
  • the average degree of polymerization of the polyvinyl alcohol is preferably about 100 to 10,000, more preferably about 1,000 to 10,000, and even more preferably about 1,500 to 4,500.
  • the saponification degree of the polyvinyl alcohol is preferably about 80 to 100 mol%, more preferably about 95 mol% to 99.95 mol%. Note that the average degree of polymerization and the degree of saponification can be determined according to JIS K 6726.
  • the polarizing film is obtained by a conventional polarizing film manufacturing method, for example, by subjecting the polyvinyl alcohol film to an optional swelling process and washing process, and at least a dyeing process, a crosslinking process, and a stretching process. .
  • the thickness of the polarizing film is preferably 1 ⁇ m or more, more preferably 2 ⁇ m or more, from the viewpoint of improving the initial polarization degree of the polarizing film, and 15 ⁇ m or less from the viewpoint of preventing panel warpage.
  • the thickness is preferably 10 ⁇ m or less, more preferably 8 ⁇ m or less.
  • the following thin film is used, in which a laminate including a polyvinyl alcohol resin layer formed on a thermoplastic resin base material is used as the polyvinyl alcohol film. A method for manufacturing a polarizing film can be applied.
  • the polarizing film is obtained by a conventional polarizing film manufacturing method.
  • the first resin film and the second resin film are not particularly limited as long as they are made of different materials, and for example, transparent protective films used in polarizing film laminates (optical films), An organic base material such as a retardation film can be used.
  • the thickness of the first resin film and the second resin film can be determined as appropriate, but generally from the viewpoint of workability such as strength and handleability, the thickness is preferably 0.5 ⁇ m or more. Preferably, it is 1 ⁇ m or more, more preferably 2 ⁇ m or more, and from the viewpoint of thin layer properties, it is preferably 500 ⁇ m or less, more preferably 300 ⁇ m or less, and 100 ⁇ m or less. It is even more preferable that there be.
  • Examples of the material constituting the transparent protective film include cellulose ester resin, polycarbonate resin, (meth)acrylic resin, cyclic polyolefin resin, polyester resin, and the like.
  • Examples of the retardation film include a birefringent film formed by uniaxially or biaxially stretching a polymer material, an oriented film of a liquid crystal polymer, and a film in which an oriented layer of a liquid crystal polymer is supported by a film.
  • the transparent protective film and the retardation film include other layers such as a hard coat layer, an antireflection layer, an antisticking layer, a diffusion layer or an antiglare layer; a reflection plate, a semi-transparent plate, a retardation plate (1/
  • One or more optical layers used for forming an image display device such as a viewing angle compensation film (including a wavelength plate of 2 or 1/4 wave plate), a viewing angle compensation film, etc. may be provided.
  • the other layers and optical layers mentioned above are usually bonded together via a pressure-sensitive adhesive layer or an adhesive layer, which will be described later.
  • the resin films on both sides may be the same or different.
  • the first resin film and/or the second resin film contains an ultraviolet absorber, an antioxidant, a lubricant, a plasticizer, a mold release agent, an anti-coloring agent, a flame retardant, an antistatic agent, a pigment, and a colorant. It may also contain any suitable additives such as.
  • the first resin film and the second resin film can be directly bonded without using an adhesive layer or a pressure-sensitive adhesive layer, including a pressure bonding method, irradiation with energy rays such as ultraviolet rays and electron beams.
  • surface treatment may be performed by irradiating the bonding surface of either or both of the first resin film and the second resin film with ultraviolet light. After that, it is preferable to bond them together via a volatile medium, and then dry the volatile medium.
  • the presence of the volatile medium allows for close adhesion to the bonding surfaces without air bubbles, etc., and furthermore, drying the volatile medium significantly increases the adhesive strength of the bonding surfaces (interfaces).
  • the wavelength of the ultraviolet light is preferably 250-100 nm, more preferably 200-100 nm, and among them, a wavelength of 172 nm using a xenon excimer lamp (excimer UV) is preferred from the viewpoint of mass productivity. Particularly preferred.
  • the illumination intensity of the ultraviolet light is preferably 1 mW/cm 2 or more, more preferably 50 mW/cm 2 or more from the viewpoint of processing capacity.
  • the cumulative light amount is preferably 1 mJ/cm 2 or more from the viewpoint of adhesiveness, more preferably 50 mJ/cm 2 or more, and 5000 mJ/cm 2 or less from the viewpoint of damage to the film. It is preferable that it is, and it is more preferable that it is 2000 mJ/cm 2 or less.
  • the temperature at the time of ultraviolet light irradiation is not particularly limited, and from the viewpoint of stabilizing surface modification, it is preferably about 0 to 50 degrees Celsius, more preferably about 10 to 40 degrees Celsius, and the polarizing film For production purposes, it is convenient to use room temperature. Further, the atmosphere during ultraviolet light irradiation only needs to have an oxygen concentration of 21% or less, and from the viewpoint of processing efficiency, the oxygen concentration is preferably 7.0% or less.
  • the volatile medium is not particularly limited, and from the viewpoint of drying efficiency, solvents such as water, ethanol, toluene, cyclohexane, acetone, etc. are preferred, and from the viewpoint of the environment, water is more preferred.
  • the heating temperature may be sufficient as long as it can appropriately dry the volatile medium; for example, when the volatile medium is water, it is preferably about 40 to 80°C, more preferably about 50 to 70°C. .
  • the drying time cannot be absolutely determined because it is affected by the temperature of the polarizing film, it is preferably about 1 minute to 60 minutes, more preferably about 3 minutes to 15 minutes.
  • the drying step may be performed only once, or may be performed multiple times as necessary.
  • the above lamination can be performed using a roll laminator or the like.
  • the bonding interface between the first resin film and the second resin film may include a modified layer or a high elastic layer resulting from the treatment during lamination.
  • the adhesive force (peel strength) between the first resin film and the second resin film is preferably 0.5 N/15 mm or more, and preferably 1.0 N/15 mm or more. More preferably, it is 1.5 N/15 mm or more.
  • the polarizing film and the first resin film are usually bonded together via a pressure-sensitive adhesive layer or an adhesive layer.
  • various adhesives used in polarizing films can be used, such as rubber adhesives, acrylic adhesives, silicone adhesives, urethane adhesives, vinyl adhesives, etc.
  • Examples include alkyl ether adhesives, polyvinyl alcohol adhesives, polyvinylporolidone adhesives, polyacrylamide adhesives, cellulose adhesives, and the like.
  • acrylic adhesives are preferred.
  • various adhesives used for polarizing films can be used, such as isocyanate adhesive, polyvinyl alcohol adhesive, gelatin adhesive, vinyl latex, etc. and water-based polyester. These adhesives are usually used as adhesives made of an aqueous solution (aqueous adhesives), and contain a solid content of 0.5 to 60% by weight.
  • aqueous adhesives aqueous adhesives
  • examples of the adhesive include active energy ray curable adhesives such as ultraviolet ray curable adhesives and electron beam curable adhesives.
  • active energy ray-curable adhesive include (meth)acrylate adhesives.
  • Examples of the curable component in the (meth)acrylate adhesive include a compound having a (meth)acryloyl group and a compound having a vinyl group.
  • Examples of compounds having a (meth)acryloyl group include alkyl (meth)acrylates having 1 to 20 carbon atoms, alicyclic alkyl (meth)acrylates, and polycyclic alkyl (meth)acrylates. ) acrylate; hydroxyl group-containing (meth)acrylate; epoxy group-containing (meth)acrylate such as glycidyl (meth)acrylate; and the like.
  • (Meth)acrylate adhesives include hydroxyethyl (meth)acrylamide, N-methylol (meth)acrylamide, N-methoxymethyl (meth)acrylamide, N-ethoxymethyl (meth)acrylamide, (meth)acrylamide, and (meth)acrylate. It may also contain nitrogen-containing monomers such as acryloylmorpholine.
  • the (meth)acrylate adhesive contains tripropylene glycol diacrylate, 1,9-nonanediol diacrylate, tricyclodecane dimethanol diacrylate, cyclic trimethylolpropane formal acrylate, dioxane glycol diacrylate, EO as a crosslinking component.
  • a compound having an epoxy group or an oxetanyl group can also be used as a 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 commonly known curable epoxy compounds can be used.
  • a compound having an epoxy group or an oxetanyl group can also be used as a cationic polymerization-curable adhesive.
  • active energy ray-curable adhesives such as (meth)acrylate adhesives are preferred.
  • the adhesive may be applied to either the resin film side or the polarizing film side, or both.
  • a drying step is performed as necessary to form an adhesive layer consisting of a coated and dried 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. When using an electron beam curing adhesive or the like, the thickness is preferably about 0.1 to 100 ⁇ m, more preferably about 0.5 to 10 ⁇ m.
  • the polarizing film laminate may be applied to an image display device.
  • image display devices include liquid crystal display devices and organic electroluminescence (EL) display devices. Since the image display device employs a configuration well known in the industry, detailed explanation will be omitted.
  • Example 1> ⁇ Preparation of polarizing film> A laminate in which a 9 ⁇ m thick PVA layer was formed on an amorphous PET base material was subjected to auxiliary stretching in the air at a stretching temperature of 130°C to produce a stretched laminate, and then the stretched laminate was dyed to produce a colored laminate. Then, the colored laminate was stretched in boric acid water at a stretching temperature of 65 degrees to obtain an optical film containing a 5 ⁇ m thick polarizing film, which was stretched together with the amorphous PET base material so that the total stretching ratio was 5.94 times. A laminate was produced.
  • the PVA molecules of the PVA layer formed on the amorphous PET base material are highly oriented, and the iodine adsorbed by dyeing is oriented in one direction as a polyiodine ion complex.
  • An optical film laminate containing a polarizing film with a thickness of 5 ⁇ m was obtained.
  • a 25 ⁇ m thick triacetyl cellulose resin film 1 (Konica Minolta Tac KC2UA, manufactured by Konica Minolta) and a 3 ⁇ m thick cycloolefin resin film 2 (2,4- 10 g of cycloolefin polymer (COP) film (trade name "Zeonor Film ZF14”) was added to 90 g of a 2:3 mixed solvent of trichlorobenzene and toluene to prepare a COP solution, and then coated using bar coater #13.
  • COP cycloolefin polymer
  • the release liner was peeled off to obtain an optical laminate in which resin film 1 and resin film 2 were directly bonded.
  • the following active energy ray-curable adhesive was barred onto the cycloolefin resin film surface of the optical laminate in which the triacetyl cellulose resin film 1 and the cycloolefin resin film 2 obtained above were directly bonded. It was coated with a coater and bonded to the polarizing film surface of the optical film laminate containing the 5 ⁇ m thick polarizing film obtained in Example 1 using a laminator.
  • active energy ray curable adhesive 16.5 parts by weight of 2-hydroxyethyl acrylamide (manufactured by KJ Chemicals, trade name: HEAA), 1 part by weight of 4-vinylphenylboronic acid (manufactured by Tokyo Chemical Industry Co., Ltd.), 2-hydroxy-3-phenoxypropyl acrylate (manufactured by Toa) 30.5 parts by weight of 1,9-nonanediol diacrylate (manufactured by Kyoeisha Chemical Co., Ltd., trade name: Aronix M-5700), 25 parts by weight of 1,9-nonanediol diacrylate (manufactured by Kyoeisha Chemical Co., Ltd., trade name: Light Acrylate 1,9ND-A),
  • FIG. 1 shows a schematic diagram of a 180° bending durability tester (manufactured by Imoto Seisakusho Co., Ltd.). This device has a mechanism in which a chuck on one side with a mandrel in between repeatedly bends 180 degrees in a constant temperature bath, and the bending radius can be changed depending on the diameter of the mandrel. The mechanism is such that the test stops when the film breaks.
  • the evaluation sample (5 cm x 15 cm) of the optical laminate manufactured above was set in the device so that the polarizing film was located on the outside (TAC on the mandrel side), the bending angle was 180°, the bending radius was 3 mm, The bending was performed at a bending speed of 1 second/time and a weight of 100 g.
  • the evaluation criteria are as follows. [Adhesion] Good: Even after the number of bending reaches 200,000 times, there is no peeling between the first resin film and the second resin film. ⁇ : Even after the number of bending reaches 200,000 times, there is slight peeling between the first resin film and the second resin film only in the bending region (practical level).
  • Double-sided tape No. 500, manufactured by Nitto Denko Corporation was bonded to two sides of the resin film of the optical laminate consisting of the above resin film 1 and resin film 2. Further, it was cut into a size of 200 mm x 15 mm, and after making a cut with a cutter knife between resin film 1 and resin film 2, the release film of the double-sided tape was peeled off, and the adhesive side was bonded to a glass plate.
  • the polarizing film and the transparent protective film were peeled in a 90 degree direction at a peeling speed of 1000 mm/min using a flexible angle adhesive/film peeling analyzer (VPA-2, manufactured by Kyowa Interface Science Co., Ltd.), and the peel strength (N/15 mm) was measured. ) was measured.
  • VPN-2 flexible angle adhesive/film peeling analyzer
  • ⁇ Comparative example 1> As a resin film, the above active energy ray-curable adhesive was applied to a 25 ⁇ m thick triacetyl cellulose resin film 1 (Konica Minolta Tack KC2UA, manufactured by Konica Minolta) using a bar coater, and then a 3 ⁇ m thick film was coated using a laminator. Cycloolefin resin film 2 (10 g of cycloolefin polymer (COP) film (trade name "Zeonor Film ZF14”) was added to 90 g of a 2:3 mixed solvent of 2,4-trichlorobenzene and toluene to form a COP solution.
  • COP cycloolefin polymer
  • the release liner of the resin film 2 of the optical laminate was peeled off, the active energy ray-curable adhesive was applied to the surface of the resin film 2 using a bar coater, and the adhesive obtained in Example 1 was applied using a laminator.
  • the film was bonded to the polarizing film surface of an optical film laminate containing a polarizing film with a thickness of 5 ⁇ m.
  • active energy rays were irradiated from the resin film side to cure the adhesive, thereby obtaining a polarizing film laminate in which the resin film was bonded to the polarizing film via the adhesive.
  • ⁇ Comparative example 2> A cycloolefin resin film with a thickness of 50 ⁇ m and a cycloolefin resin film with a thickness of 15 ⁇ m are laminated by pressure bonding using a roll laminator at a temperature of 145°C, and each cycloolefin resin film is directly bonded. A laminate was obtained. Subsequently, the 15 ⁇ m thick cycloolefin resin film side of the obtained optical laminate and the 30 ⁇ m thick polarizing film were pressed together under the same conditions as above, thereby producing a polarizing film in which the optical laminate and the polarizing film were directly bonded. I got it.
  • Example 1 The same evaluation as in Example 1 was performed using the polarizing films obtained in each of the above Examples and Comparative Examples. The results are shown in Table 1.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Laminated Bodies (AREA)
  • Polarising Elements (AREA)

Abstract

L'invention concerne un empilement de films polarisants qui est pourvu d'un film polarisant, d'un premier film de résine et d'un second film de résine dans cet ordre, le film polarisant ayant une épaisseur de 20 µm ou moins, et le premier film de résine et le second film de résine étant directement liés l'un à l'autre. L'empilement de films polarisants présente une excellente résistance à la fissuration et une excellente propriété d'adhérence vis-à-vis d'une flexion répétée.
PCT/JP2023/010807 2022-03-30 2023-03-20 Empilement de films polarisants et dispositif d'affichage d'images WO2023189796A1 (fr)

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JP2022055703 2022-03-30
JP2022-055703 2022-03-30

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005085918A1 (fr) * 2004-03-09 2005-09-15 Kuraray Co., Ltd. Dispositif optique
WO2009099049A1 (fr) * 2008-02-04 2009-08-13 Sumitomo Chemical Company, Limited Plaque polarisante, élément optique et dispositif d'affichage à cristaux liquides
JP2017107756A (ja) * 2015-12-10 2017-06-15 エルジー ディスプレイ カンパニー リミテッド フレキシブル有機ｅｌ表示装置及びその製造方法
WO2017188212A1 (fr) * 2016-04-28 2017-11-02 ウシオ電機株式会社 Procédé de fabrication de structure liée et appareil de fabrication de structure liée
WO2019163461A1 (fr) * 2018-02-26 2019-08-29 日東電工株式会社 Plaque de polarisation dotée d'une couche antireflet et son procédé de production

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005085918A1 (fr) * 2004-03-09 2005-09-15 Kuraray Co., Ltd. Dispositif optique
WO2009099049A1 (fr) * 2008-02-04 2009-08-13 Sumitomo Chemical Company, Limited Plaque polarisante, élément optique et dispositif d'affichage à cristaux liquides
JP2017107756A (ja) * 2015-12-10 2017-06-15 エルジー ディスプレイ カンパニー リミテッド フレキシブル有機ｅｌ表示装置及びその製造方法
WO2017188212A1 (fr) * 2016-04-28 2017-11-02 ウシオ電機株式会社 Procédé de fabrication de structure liée et appareil de fabrication de structure liée
WO2019163461A1 (fr) * 2018-02-26 2019-08-29 日東電工株式会社 Plaque de polarisation dotée d'une couche antireflet et son procédé de production

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