WO2007145081A1 - Film de protection de polariseur, plaque de polarisation et affichage d'image - Google Patents

Film de protection de polariseur, plaque de polarisation et affichage d'image Download PDF

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Publication number
WO2007145081A1
WO2007145081A1 PCT/JP2007/061067 JP2007061067W WO2007145081A1 WO 2007145081 A1 WO2007145081 A1 WO 2007145081A1 JP 2007061067 W JP2007061067 W JP 2007061067W WO 2007145081 A1 WO2007145081 A1 WO 2007145081A1
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WIPO (PCT)
Prior art keywords
polarizing plate
polarizer
weight
layer
film
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PCT/JP2007/061067
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English (en)
Japanese (ja)
Inventor
Mie Nakata
Yuuki Nakano
Original Assignee
Nitto Denko Corporation
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.)
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Publication of WO2007145081A1 publication Critical patent/WO2007145081A1/fr

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Classifications

    • 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
    • G02F1/133528—Polarisers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L1/00—Compositions of cellulose, modified cellulose or cellulose derivatives
    • C08L1/02—Cellulose; Modified cellulose
    • 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
    • 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
    • G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
    • G02F2201/50—Protective arrangements

Definitions

  • Polarizer protective film polarizing plate, and image display device
  • the present invention relates to a polarizer protective film, a polarizing plate, and an image display device such as a liquid crystal display device, an organic EL display device, and a PDP, including at least the sentence.
  • a polarizing plate used in an image display device is typically a triacetyl cellulose in a polarizer obtained by dyeing polybutyl alcohol (PVA) film with dichroic iodine or a dichroic dye. Manufactured by attaching a polarizer protective film such as (TAC) film.
  • PVA polybutyl alcohol
  • TAC polarizer protective film
  • the polarizer protective film is likely to curl. For this reason, curling is likely to occur even in a polarizing plate obtained by laminating a polarizer protective film on both sides of the polarizer.
  • Curling in the polarizing plate causes various problems. For example, there is a problem that the liquid crystal cell cannot be smoothly bonded, a problem that the liquid crystal cell is easily peeled even if it is bonded, and a problem that the appearance is deteriorated.
  • the various problems described above become more prominent as the polarizing plate becomes larger. Therefore, several technical capabilities S have been proposed for obtaining a polarizing plate that suppresses curling as much as possible.
  • a polarizing plate provided with an adhesive layer and a separator is provided with a polarizing plate by strictly controlling the moisture content of the polarizing plate before and after the lamination of the adhesive layer and the separator.
  • a technique for suppressing the occurrence of curling in a plate has been proposed (see Patent Document 2).
  • Patent Document 1 Japanese Patent Application Laid-Open No. 2004-184809
  • Patent Document 2 JP 2005-326531 A
  • the present invention has been made to solve the above-described conventional problems.
  • the purpose of the present invention is to (1) simply provide a polarizer protective film in which the occurrence of curling is suppressed at a high level.
  • (3) Using such a polarizing plate The object is to provide a high-quality image display device.
  • the polarizer protective film of the present invention has a cellulose resin as a main component and a moisture content of 3
  • the cellulosic resin is triacetyl cellulose.
  • a polarizing plate is provided.
  • the polarizing plate of the present invention is a polarizing plate having protective layers on both sides of the polarizer, and at least one of the protective layers is a cellulose resin layer, and the cellulose resin layer is the polarizer of the present invention. It is formed using a protective film.
  • the cellulose resin layer is a triacetyl cellulose layer.
  • the cellulose resin layer is provided only on one surface side of the polarizer.
  • the polarizer has a layer containing a (meth) acrylic resin as a main component on the side opposite to the side having the cellulose-based resin layer.
  • At least one of the protective layers on both sides of the polarizer is laminated with the polarizer via an adhesive layer formed from a polyvinyl alcohol-based adhesive.
  • both protective layers on both sides of the polarizer are It is laminated with the polarizer through an adhesive layer formed from a livinyl alcohol adhesive.
  • the polyvinyl alcohol-based adhesive contains a polyvinyl alcohol-based resin and a crosslinking agent.
  • the polybulualcohol-based adhesive contains a polybulualcohol-based resin, a crosslinking agent, and a metal compound colloid having an average particle size of:! To lOOnm.
  • the metal compound colloid is blended at a ratio of 200 parts by weight or less with respect to 100 parts by weight of the polybulal alcohol resin.
  • an adhesive layer is further provided as at least one of the outermost layers.
  • an image display device is provided.
  • the image display device of the present invention includes at least one polarizing plate of the present invention.
  • a polarizer protective film in which curling is suppressed at a high level without requiring a complicated manufacturing procedure.
  • a polarizing plate that is suppressed from being curled at a high level and has an excellent appearance that does not easily peel off even when bonded to a liquid crystal cell. It is possible to provide a high-quality image display device using such a polarizing plate.
  • FIG. 1 is a cross-sectional view showing an example of a polarizing plate of the present invention.
  • FIG. 2 is a cross-sectional view showing an example of a polarizing plate of the present invention.
  • FIG. 3 is a schematic cross-sectional view of a liquid crystal display device according to a preferred embodiment of the present invention.
  • the polarizer protective film of the present invention contains a cellulose resin as a main component.
  • the cellulose resin include diacetyl cellulose and triacetyl cellulose, and triacetyl cellulose is preferable in terms of transparency and adhesiveness.
  • the polarizer protective film of the present invention may contain any appropriate other component as long as the effects of the present invention are not impaired.
  • the polarizer protective film of the present invention preferably contains 90% by weight or more of a cellulose resin, more preferably 95% by weight or more, still more preferably 98% by weight or more, and particularly preferably 100% by weight.
  • the thickness of the polarizer protective film of the present invention is preferably 20 ⁇ ! ⁇ 100 zm, more preferably 30 ⁇ m to 80 ⁇ m.
  • the thickness of the polarizer protective film is 20 ⁇ m or more, it has appropriate strength and rigidity, and handling properties are good at the time of secondary care such as laminating and printing.
  • the phase difference generated by the stress at the time of cutting the bow can be easily controlled, and the film can be manufactured stably and easily. If the thickness of the polarizer protective film is 100 ⁇ or less, In addition to easy rumming, line speed, productivity, and control become easier.
  • the polarizer protective film of the present invention has a water content of 3.1 wt% to 4.0 wt%.
  • an effect that the occurrence of curling can be remarkably suppressed can be exhibited by a technical means of adjusting the water content of a film mainly composed of a cellulose-based resin within such a specific range.
  • the water content of the polarizer protective film of the present invention is preferably 3.2 wt% to 3.9 wt%, more preferably 3.3 wt% to 3.8 wt%.
  • any appropriate means can be adopted as means for adjusting the water content within the above specific range.
  • the polarizer protective film is immersed in water under appropriate conditions and then dried under appropriate conditions so that the water content is adjusted to be within the specific range described above.
  • the polarizer protective film of the present invention is preferably transparent and uncolored.
  • the thickness direction retardation value Rth is preferably 90 nm to +90 nm, more preferably 80 nm to +80 nm, and particularly preferably 70 nm to +70 nm.
  • the polarizer protective film of the present invention contains a cellulose-based resin as a main component and adjusts the water content within a specific range of 3.1 wt% to 4.0 wt%.
  • a polarizer protective film in which the occurrence of curling is suppressed at a high level is obtained.
  • a polybulal alcohol-based resin film dyed with a dichroic substance typically iodine or a dichroic dye
  • the degree of polymerization of the polybulal alcohol-based resin constituting the polybulal alcohol-based resin film is preferably 100 to 5000, and more preferably 1400 to 4000.
  • the polyvinyl alcohol-based resin film constituting the polarizer can be formed by any appropriate method (for example, a casting method in which a solution in which a resin is dissolved in water or an organic solvent is cast, a casting method, an extrusion method). .
  • the thickness of the polarizer can be appropriately set according to the purpose and application of the LCD in which the polarizing plate is used, but is typically 5 to 80 ⁇ m.
  • any appropriate method may be employed depending on the purpose, materials used, conditions, and the like.
  • a method is employed in which the polyvinyl alcohol-based resin film is subjected to a series of manufacturing steps including swelling, dyeing, crosslinking, stretching, washing, and drying steps. In each of the treatment steps except the drying step, the treatment is performed by immersing the polybulal alcohol-based resin film in a bath containing the solution used in each step.
  • the order, number of times, and presence / absence of each treatment of swelling, dyeing, crosslinking, stretching, washing with water, and drying can be appropriately set according to the purpose, materials used, conditions and the like.
  • a specific process that allows several processes to be performed simultaneously in one process may be omitted.
  • the stretching process may be performed after the dyeing process or before the dyeing process, or may be performed simultaneously with the swelling process, the dyeing process, and the crosslinking process.
  • it can be suitably employed to perform the crosslinking treatment before and after the stretching treatment.
  • the water washing process may be performed only after a specific process that may be performed after all the processes.
  • the swelling step is typically carried out by immersing the polybulal alcohol-based resin film in a treatment bath (swelling bath) filled with water.
  • a treatment bath shallowing bath
  • dirt on the surface of the polyvinyl alcohol resin film and an anti-blocking agent can be washed, and unevenness such as uneven dyeing can be prevented by swelling the polyvinyl alcohol resin film.
  • Glycerin, potassium iodide, or the like can be appropriately added to the swelling bath.
  • the temperature of the swelling bath is typically about 20 to 60 ° C, and the immersion time in the swelling bath is typically about 0.:! To 10 minutes.
  • the dyeing step is typically performed by immersing the polybulal alcohol-based resin film in a treatment bath (dye bath) containing a dichroic substance such as iodine.
  • a dichroic substance such as iodine.
  • water is generally used, but an appropriate amount of an organic solvent compatible with water may be added.
  • the dichroic substance is typically used at a ratio of 0.1 to 1.0 part by weight with respect to 100 parts by weight of the solvent.
  • the dye bath solution preferably further contains an auxiliary agent such as iodide. This is because the dyeing efficiency is improved.
  • the auxiliary agent is preferably used in a ratio of 0.02 to 20 parts by weight, more preferably 2 to 10 parts by weight with respect to 100 parts by weight of the solvent.
  • iodide include potassium iodide, lithium iodide, sodium iodide, zinc iodide, aluminum iodide , Lead iodide, copper iodide, barium iodide, calcium iodide, yowi tin and titanium iodide.
  • the temperature of the dyeing bath is typically about 20 to 70 ° C, and the immersion time in the dyeing bath is typically about:! To about 20 minutes.
  • the crosslinking step is typically performed by immersing the dyed polybulal alcohol resin film in a treatment bath (crosslinking bath) containing a crosslinking agent.
  • a crosslinking agent can be adopted as the crosslinking agent.
  • Specific examples of the crosslinking agent include boron compounds such as boric acid and borax, darioxal, dartalaldehyde and the like. These can be used alone or in combination.
  • a solvent used for the solution of the crosslinking bath water is generally used, but an appropriate amount of an organic solvent having compatibility with water may be added.
  • the crosslinking agent is typically used at a ratio of:! To 10 parts by weight with respect to 100 parts by weight of the solvent.
  • the solution of the crosslinking bath preferably further contains an auxiliary agent such as iodide. This is because uniform characteristics are easily obtained in the surface.
  • the concentration of the auxiliaries is preferably 0.05 to 15% by weight, more preferably 0.5 to 8% by weight. Specific examples of iodide are the same as those in the dyeing process.
  • the temperature of the crosslinking bath is typically about 20 to 70 ° C, preferably 40 to 60 ° C.
  • the immersion time in the crosslinking bath is typically about 1 second to 15 minutes, preferably 5 seconds to 10 minutes.
  • the stretching step may be performed at any stage as described above. Specifically, it may be carried out after the crosslinking treatment, which may be carried out after the dyeing treatment or before the dyeing treatment, or may be carried out simultaneously with the swelling treatment, the dyeing treatment and the crosslinking treatment.
  • the cumulative draw ratio of the polybulualcohol-based resin film needs to be 5 times or more, preferably 5 to 7 times, and more preferably 5 to 6.5 times. If the cumulative draw ratio is less than 5 times, it may be difficult to obtain a polarizing plate with a high degree of polarization. When the cumulative draw ratio exceeds 7 times, the polybulualcohol-based resin film (polarizer) may be easily broken.
  • Arbitrary appropriate methods may be employ
  • the drawing bath solution may be water or an organic solvent (e.g. A solution in which various metal salts, iodine, boron or zinc compounds are added to a solvent such as ethanol) is preferably used.
  • the water washing step is typically performed by immersing the polybutyl alcohol-based resin film subjected to the above-described various treatments in a treatment bath (water washing bath). Unnecessary residues of the polybutyl alcohol resin film can be washed away by the water washing process.
  • the washing bath may be an aqueous solution of iodide (eg, potassium iodide or sodium iodide) which may be pure water.
  • the concentration of the aqueous iodide solution is preferably 0.:! To 10% by mass.
  • An auxiliary agent such as zinc sulfate or zinc chloride may be added to the iodide aqueous solution.
  • the temperature of the washing bath is preferably 10 to 60 ° C, more preferably 30 to 40 ° C.
  • the immersion time is typically 1 second to 1 minute.
  • the water washing process can be performed only once or multiple times as necessary. In the case of carrying out a plurality of times, the kind and concentration of the additive contained in the washing bath used for each treatment can be appropriately adjusted.
  • the water washing step includes a step of immersing the polymer film in a potassium iodide aqueous solution (0 ⁇ :! to 10% by mass, 10 to 60 ° C.) for 1 second to 1 minute, and a step of rinsing with pure water. .
  • any appropriate drying method for example, natural drying, air drying, heat drying
  • the drying temperature is typically 20 to 80 ° C.
  • the drying time is typically:! To 10 minutes.
  • a polarizer is obtained.
  • the polarizing plate of the present invention has protective layers on both sides of the polarizer, and at least one of the protective layers is a cellulose resin layer. That is, a cellulose resin layer may be provided on both sides of the polarizer, or a cellulose resin layer may be provided only on one side. In the case where the cellulose resin layer is provided only on one surface side, other protective layers other than the cellulose resin layer are provided on the other surface side.
  • One of the preferred embodiments of the polarizing plate of the present invention is such that a cellulose resin layer 33 is laminated on one surface of a polarizer 31 with an adhesive layer 32 interposed therebetween, as shown in FIG.
  • the cellulose resin layer 33 ′ is laminated on the other surface of the polarizer 31 via the adhesive layer 32 ′.
  • Another preferred embodiment of the polarizing plate of the present invention is as shown in FIG.
  • the cellulose resin layer 33 is laminated on one surface of the polarizer 31 via the adhesive layer 32, and the other surface of the polarizer 31 via the adhesive layer 34 and the easy adhesion layer 35.
  • the other protective layer 36 is laminated.
  • the cellulose-based resin layer is formed using the polarizer protective film of the present invention.
  • the cellulose-based resin layer is a resin layer containing a cellulose-based resin as a main component, and examples thereof include a resin layer mainly composed of diacetyl cellulose or triacetyl cellulose, and triacetyl cellulose is transparent and adhesive. Preferable in terms of sex.
  • the cellulose-based resin layer may contain any appropriate other component as long as the effects of the present invention are not impaired.
  • the cellulose resin layer preferably contains 90% by weight or more of the cellulose resin, more preferably 95% by weight or more, further preferably 98% by weight or more, and particularly preferably 100% by weight. It is particularly preferable that the cellulose resin layer is a triacetyl cell mouth layer.
  • the cellulose resin layer has a thickness of preferably 20 ⁇ m to 100 ⁇ m, more preferably 30 ⁇ m to 80 ⁇ m.
  • the polarizing plate of the present invention has protective layers on both sides of the polarizer, and at least one of the protective layers is a cellulose resin layer.
  • the cellulose resin layer is formed using the polarizer protective film of the present invention having a water content of 3.1 wt% to 4.0 wt%. That is, the polarizing plate of the present invention is formed by bonding the polarizer protective film of the present invention to at least one of the polarizers.
  • the occurrence of curling in the polarizing plate is remarkable due to the technical means of adjusting the moisture content of the polarizer protective film to be bonded to the polarizer within such a specific range. The effect of being able to be suppressed is manifested.
  • the water content is less than 3.1% by weight or more than 4.0% by weight, curling may occur significantly in the polarizing plate.
  • any appropriate protective layer can be adopted as long as the effects of the present invention are not impaired.
  • the material which is the main component of such a protective layer include polyester-based, polyvinyl alcohol-based, polycarbonate-based, polyamide-based, polyimide-based, polyether sulfone.
  • transparent resins such as polyethylene, polysulfone, polystyrene, polynorbornene, polyolefin, talyl, and acetate.
  • thermosetting resins such as acrylic, urethane, acrylurethane, epoxy, and silicone, and ultraviolet curable resins.
  • a glassy polymer such as a siloxane-based polymer is also included.
  • polymer films described in JP-A-2001-343529 can also be used.
  • the material of the film include a resin containing a thermoplastic resin having a substituted or unsubstituted imide group in the side chain, and a thermoplastic resin having a substituted or unsubstituted phenyl group and a nitrile group in the side chain.
  • the composition can be used, for example, a resin composition having an alternating copolymer composed of isobutene and N-methylmaleimide and an acrylonitrile / styrene copolymer.
  • the polymer film can be, for example, an extruded product of the resin composition.
  • the other protective layers are preferably transparent and have no color.
  • the retardation value in the thickness direction is preferably from 1 to 90 nm, more preferably from 1 to 80 nm, and most preferably from 70 to +70 nm.
  • the other protective layer is a layer containing a (meth) acrylic resin as a main component.
  • Each of the (meth) acrylic resins may be composed of one kind of resin, or may be composed of two or more kinds of resins.
  • the (meth) acrylic resin preferably has a Tg (glass transition temperature) of 115 ° C or higher, more preferably 120 ° C or higher, still more preferably 125 ° C or higher, and particularly preferably 130 ° C. ° C or higher.
  • Tg glass transition temperature
  • the upper limit of Tg of the (meth) acrylic resin is not particularly limited, but is preferably 170 ° C or less from the viewpoint of moldability and the like.
  • the (meth) acrylic resin is not particularly limited, and examples thereof include poly (meth) acrylic acid esters such as polymethyl methacrylate, methyl methacrylate- (meth) acrylic acid copolymer, and methyl methacrylate.
  • poly (meth) acrylic acid C alkyl such as poly (meth) acrylic acid methyl ester as a main component (50 to: 100% by weight, preferably 7
  • Another example is a methyl methacrylate-based resin containing methyl methacrylate as a main component (50 to 100% by weight, preferably 70 to 100% by weight).
  • (meth) acrylic resin examples include, for example, a ring structure in a molecule described in Ataripet VH and Ataripet VRL20A manufactured by Mitsubishi Rayon Co., Ltd., and JP-A-2004-70296.
  • (meth) acrylic resin a rataton ring structure described in JP-A-2000-230016, JP-A-2001-151814, JP-A-2005-146084, etc.
  • a (meth) acrylic resin having a structure or a (meth) acrylic resin having a dartaric anhydride structure described in JP-A-2005-314534 may be used.
  • the layer containing the (meth) acrylic resin as a main component the content of the (meth) acrylic resin is preferably 50 to 99 weight 0/0, more preferably 60 to 98 weight 0/0, More preferably, it is 70 to 97% by weight. If the content of the (meth) acrylic resin is less than 50% by weight, the high heat resistance and high transparency inherent in the (meth) acrylic resin may not be sufficiently reflected. If it exceeds%, the mechanical strength may be inferior.
  • the other protective layer may contain any appropriate other component.
  • an ultraviolet absorber for example, an ultraviolet absorber, a general compounding agent, such as a stabilizer, a lubricant, an additive, a plasticizer, an impact assistant, a retardation reducing agent, an antibacterial agent, an antibacterial agent, an antibacterial agent.
  • a general compounding agent such as a stabilizer, a lubricant, an additive, a plasticizer, an impact assistant, a retardation reducing agent, an antibacterial agent, an antibacterial agent, an antibacterial agent.
  • a general compounding agent such as a stabilizer, a lubricant, an additive, a plasticizer, an impact assistant, a retardation reducing agent, an antibacterial agent, an antibacterial agent, an antibacterial agent.
  • a general compounding agent such as a stabilizer, a lubricant, an additive, a plasticizer, an impact assistant, a retardation reducing agent, an antibacterial agent, an antibacterial agent, an antibacterial agent.
  • examples include mold.
  • the other protective layer contains a retardation reducing agent.
  • the phase difference reducing agent include acrylonitrile-styrene copolymer.
  • styrene-containing polymers are preferred.
  • the addition amount of the retardation reducing agent is preferably 30% by weight or less, more preferably 25% by weight or less, and still more preferably 20% by weight or less, with respect to the total amount of resin in the other resin layers. is there. If added beyond this range, visible light is scattered or the transparency is impaired, so the properties of the polarizer as a protective layer may be lacking.
  • the thickness of the other protective layer any appropriate thickness can be adopted as long as the above preferred thickness direction retardation can be obtained.
  • the thickness of the other protective layer is preferably 20 to 200 ⁇ , more preferably 25 to 180 zm, and further preferably 30 to 140 ⁇ m.
  • the thickness of the other protective layer is 20 ⁇ m or more, it has appropriate strength and rigidity, and handling properties are good in the secondary care such as laminating and printing.
  • the phase difference generated by the stress at the time of take-up can be easily controlled, and the finoleum can be manufactured stably and easily. If the thickness of the other protective layer is 200 zm or less, film removal is facilitated, and line speed, productivity, and controllability are also facilitated.
  • the other protective layer may be a film stretched by longitudinal stretching and / or lateral stretching. By being stretched by longitudinal stretching and / or lateral stretching, it becomes possible to impart excellent optical properties, and it is also excellent in mechanical strength, and productivity and reworkability can be improved. .
  • the stretching may be stretching by only longitudinal stretching (free-end uniaxial stretching) or stretching by only lateral stretching (fixed-end uniaxial stretching), but the longitudinal stretching ratio is 1.:! To 3.0. It is preferable to perform sequential stretching or simultaneous biaxial stretching with a magnification of 1.times.
  • stretching by only longitudinal stretching (free end uniaxial stretching) and stretching by only transverse stretching (fixed end uniaxial stretching) the film strength increases only in the stretching direction, and the strength does not increase in the direction perpendicular to the stretching direction.
  • the film as a whole may not have sufficient film strength.
  • the longitudinal draw ratio is more preferably 1.2 to 2.5 times, and still more preferably 1.3 to 2.0 times.
  • the transverse stretching ratio is more preferably 1.2 to 2.5 times, and still more preferably 1.4 to 2.5 times.
  • the draw ratio may be too low and there may be little effect of stretching. If the longitudinal draw ratio and transverse draw ratio exceed 3.0, Due to the problem of the smoothness of the end face of the rumm, the stretch breakage is likely to occur.
  • the stretching temperature is preferably Tg to (Tg + 30 ° C) of the film to be stretched. If the stretching temperature is lower than Tg, the film may be broken. If the stretching temperature exceeds (Tg + 30 ° C), the film may start to melt, making it difficult to pass the paper.
  • the other protective layer may be produced by any appropriate method.
  • a film obtained by melt extrusion may be used as the other protective layer.
  • a method of forming a film by melt extrusion specifically, a resin composition as a raw material is supplied to an extruder connected to a T-die, and after melt-kneading, it is extruded, cooled by water, and taken out.
  • a method of forming can be exemplified.
  • the screw type of the extruder may be uniaxial or biaxial, and additives such as plasticizers or antioxidants may be added.
  • the temperature of melt extrusion can be set as appropriate, but when the glass transition temperature of the resin composition as the raw material is Tg (° C), (Tg + 80) ° C to (Tg + 180) ° C is preferred (Tg + 100) ° C to (Tg + 150) ° C is more preferred. If the extrusion molding temperature is too low, there is a possibility that molding cannot be performed due to the poor fluidity of the resin. If the extrusion molding temperature is too high, the resin viscosity will be low, and there may be a problem in production stability such as uneven thickness of the molded product.
  • the other protective layer has a YI force at a thickness of 80 ⁇ , preferably 1 ⁇ 3 or less, more preferably 1.27 or less, more preferably 1.25 or less, more preferably 1.23 or less, particularly Preferably it is 1. 20 or less. If the YI at a thickness of 80 / im exceeds 1.3, excellent optical transparency may not be exhibited.
  • YI uses, for example, a high-speed integrating sphere type spectral transmittance measuring device (trade name: DOT-3C: manufactured by Murakami Color Research Laboratory), and tristimulus values of colors obtained by measurement ( ⁇ , ⁇ , ⁇ ) From the following equation.
  • the other protective layer has a b value (hue scale according to Hunter's color system) at a thickness of 80 xm, preferably less than 1.5, and more preferably 1.0 or less. When the b value is 1.5 or more, excellent optical transparency may not be exhibited due to coloring of the film.
  • the b value can be measured, for example, by cutting the sample into 3cm squares and using a high-speed integrating sphere type spectral transmittance measuring machine (trade name DOT-3C: manufactured by Murakami Color Research Laboratory). . In addition, the hue can be evaluated by b value according to Hunter's color system.
  • the other protective layer has an in-plane retardation And of preferably 3. Onm or less, more preferably 1. Onm or less. If the in-plane retardation And exceeds 3. Onm, excellent optical characteristics may not be exhibited.
  • the other protective layer has a thickness direction retardation Rth force of preferably 5. Onm or less, and more preferably 3. Onm or less. When the thickness direction retardation Rth exceeds 5. Onm, excellent optical characteristics may not be exhibited.
  • moisture permeability preferably 100 g / m 2 '24hr or less, more preferably 60gZm 2' is 24hr or less. If the moisture permeability exceeds 100 g / m 2 '24 hr, the moisture resistance may be poor.
  • the other protective layer preferably also has excellent mechanical strength.
  • Tensile strength, in the MD direction preferably 65NZmm 2 or more, more preferably 70N / mm 2 or more, preferably in the al 75N / mm 2 or more, particularly preferably 80 N / mm 2 or more, Oite in TD , preferably 45N / mm 2 or more, more preferably 50 N / mm 2 or more, more preferably 55N / mm 2 or more, and particularly preferably 60N / mm 2 or more.
  • the tensile elongation is preferably 6.5% or more, more preferably 7.0% or more, further preferably 7.5% or more, particularly preferably 8.0% or more in the MD direction, and in the TD direction.
  • It is preferably 5.0% or more, more preferably 5.5% or more, still more preferably 6.0% or more, and particularly preferably 6.5% or more. If the tensile strength or tensile elongation is outside the above range, there is a risk that excellent mechanical strength will not be exhibited.
  • the other protective layer has a lower haze that represents optical transparency, and is preferably as low as possible. Preferably it is 5% or less, more preferably 3% or less, even more preferably 1.5% or less, and particularly preferably. Is less than 1%.
  • the haze is 5% or less, a good tally feeling can be visually given to the film, and when the haze is 1.5% or less, the visibility and the daylighting property can be obtained even when used as a daylighting member such as a window. Both can be obtained, and even when used as a front plate of a display device, the display contents can be visually recognized well, so the industrial utility value is high.
  • the polarizer protective film of the present invention and the above-mentioned other protective layers are used for, for example, building lighting members such as windows and carport roofing materials, vehicle lighting members such as windows, etc.
  • Agricultural daylighting materials such as greenhouses, lighting members, front filter etc. It can be used in layers, and has been traditionally covered with (meth) acrylic resin films.
  • Household appliance casings, vehicle interior parts, interior building materials, wallpaper, decorative boards, entrance doors, window frames, widths It can also be used by being laminated on wood or the like.
  • the polarizing plate of the present invention at least one of the protective layers on both sides of the polarizer is laminated with the polarizer via an adhesive layer formed from a polyvinyl alcohol-based adhesive. It is preferable. More preferably, both of the protective layers on both sides of the polarizer are laminated with the polarizer via an adhesive layer formed from a polybulal alcohol adhesive.
  • the polarizing plate of this invention it is preferable to have an adhesive layer between the said polarizer and the said cellulose resin layer. Moreover, when using the said other protective layer, it is preferable to have an adhesive bond layer between the said polarizer and said other protective layer.
  • the adhesive layer is a layer formed from a polybulal alcohol-based adhesive.
  • the polyvinyl alcohol-based adhesive contains a polyvinyl alcohol-based resin and a crosslinking agent.
  • the polyvinyl alcohol-based resin is not particularly limited.
  • the polyvinyl alcohol resin obtained by saponifying polyvinyl acetate; a derivative thereof; and a monomer co-polymerizable with butyl acetate. And saponified products of copolymers; modified polyvinyl alcohols obtained by polyacetalization, polyacetalization, urethane conversion, etherification, grafting, phosphate esterification, and the like.
  • Examples of the monomer include unsaturated carboxylic acids such as (anhydrous) maleic acid, fumaric acid, crotonic acid, itaconic acid, and (meth) acrylic acid and esters thereof; ⁇ -olefins such as ethylene and propylene, ( (Meth) aryl sulfonic acid (soda), sulfonic acid soda (monoanorequinolemaleate), disnolephonic acid soda anorequinolemaleate, ⁇ -methylo-noraretalinoreamide, acrylamidoalkyl sulfonic acid alkali salt, ⁇ ⁇ -Bulpyrrolidone, ⁇ _ Examples include bulurpyrrolidone derivatives. These polybulal alcohol resins can be used only for one type, or can be used in combination with two or more types.
  • the above polybulal alcohol resin preferably has an average degree of polymerization of 100 to 3000, more preferably 500 to 3000, and an average degree of polymerization of preferably 85 to 100 monolayer. 0/0, more preferably f or 90: 100 Monore 0/0.
  • a polyvinyl alcohol-based resin having a acetoacetyl group can be used as the polyvinyl alcohol-based resin.
  • a polyvinyl alcohol-based resin having a acetoacetyl group is a polyvinyl alcohol-based adhesive having a highly reactive functional group, which is preferable in terms of improving the durability of the polarizing plate.
  • a polybulualcohol-based resin containing a acetoacetyl group is obtained by reacting a polybulualcohol-based resin with diketene by a known method.
  • a polybutyl alcohol resin is dispersed in a solvent such as acetic acid and diketene is added thereto, and the polybutyl alcohol resin is dissolved in a solvent such as dimethylformamide or dioxane in advance. And a method of adding diketene to this.
  • the method of making polyketol alcohol contact diketene gas or liquid diketene directly is mentioned.
  • the degree of modification of the acetoacetyl group of the polybutyl alcohol resin having a acetoacetyl group is not particularly limited as long as it is 0.1 mol% or more. If it is less than 1 mol%, the adhesive layer has insufficient water resistance, which is inappropriate.
  • Asetasechiru group modification degree is preferably 0.1:! ⁇ 40 mol 0/0, more preferably 1 to 20 mol 0/0.
  • Asetasechiru group modification degree decreases the number of reaction sites with a crosslinking agent exceeds 40 mole 0/0, a small effect of improving the water resistance.
  • the degree of modification of the acetoacetyl group is a value measured by NMR.
  • crosslinking agent those used for polyvinyl alcohol adhesives can be used without particular limitation.
  • a compound having at least two functional groups having reactivity with the polybulal alcohol resin can be used.
  • ethylene diamine, triethylene diamine, hexamethylene diamine, etc., ananolylene diamine having two amino groups and an amino group hexamethylene diamine is particularly preferred
  • ethylene glycol diglycidyl ether polyethylene glycol diglycidyl ether, glycerin di or triglycidyl ether, 1,6-hexanediol diglycidyl ether, tri Chi trimethylolpropane triglycidyl ether, Jigurish
  • the blending amount of the crosslinking agent is preferably 0.:! To 35 parts by weight, and more preferably 10 to 25 parts by weight with respect to 100 parts by weight of the polybulal alcohol resin.
  • a crosslinking agent can be blended in a range of more than 30 parts by weight and not more than 46 parts by weight with respect to 100 parts by weight of the polybutyl alcohol resin.
  • the polyvinyl alcohol-based adhesive preferably further contains a metal compound colloid.
  • the metal compound colloid is one in which fine particles are dispersed in a dispersion basket, and is electrostatically stabilized due to mutual repulsion of the same kind of charge of the fine particles, and has permanent stability.
  • the average particle diameter of the metal compound colloid is 1 to:! OOnm, preferably 1 to 50nm. If the average particle diameter of the metal compound colloid is in the above range, the metal compound can be dispersed substantially uniformly in the adhesive layer, the adhesion between the polarizer and the protective layer can be ensured, and the resulting polarizing plate can be obtained. Can reduce nick defects. The range of the average particle diameter does not adversely affect the polarization characteristics even if transmitted light is scattered by the metal compound in the adhesive layer formed to be considerably smaller than the visible wavelength range.
  • any appropriate colloid may be used as the metal compound colloid.
  • metal compound colloid aluminum Colloids of metal oxides such as sodium, silica, zirconia, titania; colloids of metal salts such as aluminum silicate, magnesium silicate, calcium carbonate, zinc carbonate, barium carbonate, calcium phosphate; celite, talc, clay, kaolin, etc. Mineral colloids; and the like.
  • the metal compound colloid is present in the state of a colloidal solution dispersed in a dispersion medium.
  • a dispersion medium water is preferable.
  • other dispersers such as alcohols can be used.
  • any appropriate concentration can be adopted as long as the object of the present invention can be achieved. For example::! To 50% by weight is preferred, and:! To 30% by weight is more preferred.
  • a stabilizer containing an acid such as nitric acid, hydrochloric acid, or acetic acid can be used.
  • the metal compound colloid is electrostatically stabilized and can be classified into those having a positive charge and those having a negative charge.
  • the metal compound colloid is a non-conductive material. Positive charge and negative charge are distinguished by the charge state of the colloidal surface charge in the solution after the preparation of the adhesive.
  • the charge of the metal compound colloid can be confirmed, for example, by measuring the zeta potential with a zeta potential measuring machine.
  • the surface charge of a metal compound colloid generally varies with pH. Therefore, the surface charge of the metal compound colloid in the present invention is influenced by the pH of the prepared adhesive solution.
  • the pH of the adhesive solution is preferably in the range of 2 to 6, more preferably 2.5 to 5, more preferably 3 to 5, particularly preferably 3.5 to 4.5.
  • a metal compound colloid having a positive charge has a greater effect of suppressing the occurrence of nicks than a metal compound colloid having a negative charge.
  • positively charged metal compound colloids include alumina colloids and titania colloids. Among these, alumina colloid is particularly preferable.
  • the metal compound colloid is preferably blended at a ratio of 200 parts by weight or less (converted value of solid content) with respect to 100 parts by weight of the polybutyl alcohol resin.
  • the compounding ratio of the metal compound colloid is 10 to 200 parts by weight is more preferred with respect to 100 parts by weight of the alcoholic resin. 20 to 175 parts by weight is more preferred. 30 to 150 parts by weight is particularly preferred.
  • the mixing ratio of the metal compound colloid is preferably set to the lower limit of the above range.
  • the adhesive that can be used in the present invention is, for example, a resin solution containing a polybulal alcohol-based resin, and is usually used as an aqueous solution. Any appropriate concentration can be adopted as the solid content concentration in the resin solution. In consideration of coating property and storage stability, the content is preferably 0.1 to 15% by weight, more preferably 0.5 to 10% by weight. Any appropriate viscosity can be adopted as the viscosity of the resin solution. For example: the range of:! ⁇ 50mPa's is preferred. The nick generated during the production of the polarizing plate tends to increase as the viscosity of the resin solution decreases.
  • the adhesive containing the polyvinyl alcohol-based resin the cross-linking agent, and the metal compound colloid. Therefore, even at a low viscosity in the range of 1 to 20 mPa's, the occurrence of nicks can be suppressed, and the occurrence of nicks can be suppressed regardless of the viscosity of the resin solution.
  • Polyvinyl alcohol-based resins containing a acetoacetyl group cannot increase the degree of polymerization compared to general polybutyl alcohol-based resins, and have been used with the low viscosity as described above. By containing the slag, the occurrence of nicks caused by the low viscosity of the resin solution can be suppressed.
  • any appropriate method can be adopted as a method of preparing the resin solution.
  • the metal compound colloid is usually mixed with a polybutyl alcohol resin and the crosslinking agent, and the concentration is appropriately adjusted. Is added to prepare a resin solution.
  • a polyvinyl alcohol resin containing an acetoacetyl group is used as the polyvinyl alcohol resin, or if the amount of the crosslinking agent is large, the polybut alcohol alcohol resin is considered in view of the stability of the solution.
  • the metal compound colloid can be mixed, and then the cross-linking agent can be mixed in consideration of the timing of use of the resulting resin solution. Tree that is adhesive
  • the concentration of the fat solution can be appropriately adjusted after preparing the resin solution.
  • the polyvinyl alcohol-based adhesive further includes coupling agents such as silane coupling agents and titanium coupling agents, various tackifiers, UV absorbers, antioxidants, heat stabilizers, and water resistance. Stabilizers such as decomposition stabilizers can also be blended.
  • the polarizer protective film of the present invention is provided on the side where the polarizer is provided, or on the side provided with the polarizer of the protective layer when the other protective layer is used, in order to improve adhesion.
  • Adhesive treatment can be applied.
  • Examples of the easy adhesion treatment include surface treatment such as corona treatment, plasma treatment, low-pressure UV treatment, and saponification treatment.
  • An easy-adhesion layer is preferably formed between the protective layer and the adhesive layer in order to improve adhesion.
  • Examples of the easy-adhesion layer include a silicone layer having a reactive functional group.
  • the material of the silicone layer having a reactive functional group is not particularly limited.
  • a titanium-based catalyst or tin-based catalyst for efficiently reacting the above silanol it is possible to strengthen the adhesive force.
  • other additives may be added to the silicone having the reactive functional group. Specifically, terpene resins, phenol resins, terpene-phenol resins, rosin resins, xylene resins and other tackifiers, UV absorbers, antioxidants, heat stabilizers and other stabilizers may be used.
  • the silicone layer having a reactive functional group is formed by coating and drying by a known technique.
  • the thickness of the silicone layer is preferably 1 to 100 nm, more preferably 10 to 80 nm after drying.
  • silicone with reactive functional groups may be diluted with a solvent.
  • the dilution solvent is not particularly limited, and examples thereof include alcohols. Dilution concentration is special The amount is preferably, but not limited to: !! to 5% by weight, more preferably 1 to 3% by weight.
  • the adhesive layer is preferably formed by applying the adhesive.
  • the adhesive may be applied to either the polarizer protective film or the polarizer.
  • the adhesive may be applied to either the polarizer protective film or the polarizer. In doing so, it may go to either one of the other protective layers and the polarizer or to both.
  • a drying step is performed to form an adhesive layer composed of a coated and dried layer. This can also be bonded after forming the adhesive layer.
  • the polarizer and the polarizer protective film can be bonded together using a roll laminator or the like. The heat drying temperature and drying time are appropriately determined according to the type of adhesive.
  • the thickness of the adhesive layer is preferably 0.01 to 10 zm, more preferably 0.03 to 5xm.
  • the thickness of the adhesive layer is designed to be larger than the average particle size of the metal compound colloid.
  • the polarizing plate of the present invention may have an adhesive layer as at least one of the outermost layers (such a polarizing plate may be referred to as an adhesive polarizing plate).
  • an adhesive polarizing plate may be referred to as an adhesive polarizing plate.
  • other side of the polarizer protective film of the present invention where the polarizer is not bonded, or when the other protective layer is used, on the side where the polarizer of the protective layer is not bonded An adhesive layer for adhering to other members such as an optical film and a liquid crystal cell can be provided.
  • the pressure-sensitive adhesive forming the pressure-sensitive adhesive layer is not particularly limited.
  • an acrylic polymer, silicone-based polymer, polyester, polyurethane, polyamide, polyether, fluorine-based or rubber-based polymer is used as a base polymer.
  • those having excellent optical transparency such as an acrylic pressure-sensitive adhesive, exhibiting appropriate wettability, cohesiveness, and adhesive pressure-sensitive adhesive properties, and having excellent weather resistance, heat resistance and the like can be preferably used.
  • an acrylic adhesive made of an acrylic polymer having 4 to 12 carbon atoms is preferred.
  • the pressure-sensitive adhesive layer includes, for example, natural and synthetic resins, in particular, tackifier resins, fillers and pigments made of glass fibers, glass beads, metal powders, other inorganic powders, and coloring.
  • An additive to be added to the pressure-sensitive adhesive layer such as an agent and an antioxidant may be contained.
  • An adhesive layer containing fine particles and exhibiting light diffusibility may also be used.
  • the pressure-sensitive adhesive layer can be attached by an appropriate method.
  • an adhesive solution of about 10 to 40% by weight in which a base polymer or a composition thereof is dissolved or dispersed in a solvent composed of a single solvent or a mixture of appropriate solvents such as toluene and ethyl acetate is prepared.
  • the pressure-sensitive adhesive layer may be provided on one side or both sides of the polarizing plate as a superimposed layer of different compositions or types. Moreover, when providing in both surfaces, it can also be set as adhesive layers with a different composition, a kind, thickness, etc. in the front and back of a polarizing plate.
  • the thickness of the pressure-sensitive adhesive layer can be appropriately determined according to the purpose of use and adhesive force, and is preferably 1 to 40 ⁇ m, more preferably 5 to 30 ⁇ m, and particularly preferably 10 ⁇ 25 ⁇ m. If it is thinner than 1 / m, the durability will be poor, and if it is thicker than 40 ⁇ , it will be liable to float or peel off due to foaming, resulting in poor appearance.
  • an anchor layer may be provided between the layers.
  • the anchor layer is preferably an anchor layer selected from polyurethane, polyester, and polymers containing amino groups in the molecule, particularly preferably polymers containing amino groups in the molecule. Is done. Polymers containing amino groups in the molecule are good because they exhibit interactions such as amino group strength in the molecule, carboxyl groups in the adhesive, polar groups in the conductive polymer, and ionic interactions. Secure adhesion.
  • polymers containing an amino group in the molecule include polyethyleneimine, polyallylamine, polybulamine, polybulurpyridine, polybulurpyrrolidine, and dimethylaminoethyl represented by a copolymerization monomer of the aforementioned acrylic adhesive. Contains amino groups such as attalylate Examples thereof include a monomer polymer.
  • an antistatic agent may be added.
  • Antistatic agents for imparting antistatic properties include ionic surfactants, conductive polymer systems such as polyaniline, polythiophene, polypyrrole, and polyquinoxaline, and metal oxide systems such as tin oxide, antimony oxide, and indium oxide.
  • a conductive polymer system is preferably used.
  • water-soluble conductive polymers such as polyaniline and polythiophene or water-dispersible conductive polymers are particularly preferably used. This is because when a water-soluble conductive polymer or a water-dispersible conductive polymer is used as a material for forming the antistatic layer, it is possible to suppress deterioration of the optical film substrate due to the organic solvent during the coating process.
  • the polarizer, polarizer protective film, and the like forming the polarizing plate described above, and the pressure-sensitive adhesive layer each include a salicylic acid ester compound, a benzophenol compound, and a benzotriazole compound.
  • the compound may be one having UV absorbing ability by a method such as a method of treating with a UV absorber such as a cyanoacrylate compound or a nickel complex compound.
  • a cellulose resin layer is provided on at least one surface side of a polarizer, and the water content of the cellulose resin layer is 3.1 wt% to 4.0 wt%.
  • the polarizing plate of the present invention is not limited to be provided on either the viewing side or the backlight side of the liquid crystal cell, or on both sides.
  • the image display device of the present invention includes at least one polarizing plate of the present invention.
  • a liquid crystal display device will be described as an example, but it goes without saying that the present invention can be applied to any display device that requires a polarizing plate.
  • a self-luminous display device such as ED (Field Emission Display) can be mentioned.
  • FIG. 3 is a schematic cross-sectional view of a liquid crystal display device according to a preferred embodiment of the present invention.
  • a transmissive liquid crystal display device will be described, but it goes without saying that the present invention is also applied to a reflective liquid crystal display device and the like.
  • the liquid crystal display device 100 includes a liquid crystal cell 10, a retardation film 20 and 20 'disposed with the liquid crystal cell 10 interposed therebetween, and a polarizing plate 30 disposed on the outside of the retardation films 20 and 20'. 30 ', a light guide plate 40, a light source 50, and a reflector 60.
  • the polarizing plates 30 and 30 ′ are arranged so that their polarization axes are orthogonal to each other.
  • the liquid crystal cell 10 includes a pair of glass substrates 11 and 11 ′ and a liquid crystal layer 12 as a display medium disposed between the substrates.
  • One substrate 11 is provided with a switching element (typically a TFT) for controlling the electro-optical characteristics of the liquid crystal, and a scanning line for supplying a gate signal to the switching element and a signal line for supplying a source signal. (Both not shown).
  • the other glass substrate 11 ′ is provided with a color layer constituting a color filter and a light shielding layer (black matrix layer) (both not shown).
  • a space (cell gap) between the substrates 11 and 11 ′ is controlled by a spacer 13.
  • the polarizing plate of the present invention described above is employed as at least one of the polarizing plates 30 and 30 ′.
  • such a liquid crystal display device 100 arranges IJ in such a state that the liquid crystal molecules of the liquid crystal layer 12 shift the polarization axis by 90 degrees when no voltage is applied. In such a state, incident light that is transmitted through only one direction of light by the polarizing plate is twisted 90 degrees by the liquid crystal molecule. As described above, since the polarizing plates are arranged so that their polarization axes are orthogonal to each other, the light (polarized light) reaching the other polarizing plate is transmitted through the polarizing plate. Therefore, when no voltage is applied, the liquid crystal display device 100 performs white display (normally white method).
  • the moisture content of the film was determined by loss on drying. That is, the weight of the film (10 cm ⁇ 10 cm) obtained in the example and the comparative example was measured, and then the weight after drying for 2 hours in an oven at 120 ° C. was measured. Rate.
  • the obtained polarizing plate was cut into a size of lOcm ⁇ 10 cm, placed on the plane so that the convex side was on the lower side, and the distance of the portion farthest from the plane of the polarizing plate was defined as the curl amount.
  • a polarizing plate was cut out so as to have a size of 1000 mm ⁇ 1000 mm, and a sampnore was produced. Under a fluorescent lamp, another polarizing plate (confirmed that there is no defect) was provided on the black light, and the above-mentioned Sampnore polarizing plate was placed thereon. The two polarizing plates were installed so that their absorption axes were orthogonal to each other, and in this state, the number of locations where light escaped (knic defects) was counted visually.
  • a mixture of methyl methacrylate (2 parts by weight), methacrylic acid (9 parts by weight) and potassium persulfate (0.005 parts by weight) was continuously added at 70 ° C. over 90 minutes, and maintained for another 90 minutes.
  • the shell layer was polymerized.
  • the polymer latex was coagulated with sulfuric acid, neutralized with caustic soda, washed, filtered, and dried to obtain core-shell type acrylic elastic particles (B).
  • the average particle diameter of the rubber polymer part of the Atalinole elastic particles measured with an electron microscope was 140 nm.
  • the obtained acrylic resin composition (C) was vacuum-dried at 80 ° C for 8 hours, then dissolved in methyl ethyl ketone to a solid content concentration of 30% by weight, and filtered using a 1 xm cut filter. I went over.
  • This solution is cast on a PE T film through a T die with a lip gap of 0.5 mm using a gear pump, and heat-treated for 30 minutes in each of three stages of 60 ° C, 120 ° C, and 170 ° C in a hot air oven. And a (meth) acrylic resin film having a thickness of 100 / im was obtained.
  • Polybutyl alcohol-based adhesive solution prepared by adjusting an aqueous solution containing 20 parts by weight of methylol melamine to 100 parts by weight of a poly (butyl alcohol resin) modified with acetoacetyl group (degree of acetylation 13%) to a concentration of 0.5% by weight (A) was prepared.
  • Asetasechiru group-modified poly Bulle alcohol resin 100 parts by weight (average polymerization degree: 12 00, saponification degree: 98.5 Monore 0/0, Asetasechiru degree: 5 mol 0/0) with respect Mechirorumera Min 50 parts by weight was dissolved in pure water under a temperature condition of 30 ° C. to prepare an aqueous solution adjusted to a solid content concentration of 3.7% by weight.
  • An aqueous adhesive solution (B) was prepared by adding 18 parts by weight of an aqueous colloidal alumina solution (average particle size: 15 nm, solid content concentration: 10% by weight, positive charge) to 100 parts by weight of the aqueous solution.
  • the viscosity of the aqueous adhesive solution (B) was 9.6 mPa's.
  • the pH of the aqueous adhesive solution (B) was in the range of 4 to 4.5.
  • an aqueous adhesive solution (C) was prepared in the same manner as in Production Example 4 except that the alumina colloid aqueous solution was not used.
  • a saponified 40 ⁇ m-thick triacetyl cellulose film (manufactured by Konica Minoltabuto Co., Ltd., trade name: KC4UY) was prepared and immersed in a 60 ° C. water bath for 30 seconds and washed with water. Thereafter, drying was carried out at a drying temperature of 30 ° C. for 10 seconds to obtain a triacetyl cellulose film (1) having a moisture content of 3.3% by weight.
  • a triacetylcellulose film (2) having a water content of 3.8% by weight was obtained in the same manner as in Example 1 except that air drying was performed for 30 seconds.
  • Example 2 The same procedure as in Example 1 was performed except that drying was performed at a drying temperature of 30 ° C for 30 seconds. A triacetylcellulose film (CI) having a content of 3.0% by weight was obtained.
  • CI triacetylcellulose film
  • a triacetyl cellulose film (C2) having a water content of 2.8% by weight was obtained by performing the same procedure as in Example 1 except that drying was performed at a drying temperature of 40 ° C. for 10 seconds.
  • a triacetylcellulose film (C3) having a water content of 2.4% by weight was obtained in the same manner as in Example 1 except that drying was performed at a drying temperature of 40 ° C. for 30 seconds.
  • a triacetyl cellulose film (C4) having a water content of 1.9% by weight was obtained in the same manner as in Example 1 except that drying was performed at a drying temperature of 60 ° C. for 10 seconds.
  • a triacetylcellulose film (C5) having a water content of 1.5% by weight was obtained in the same manner as in Example 1 except that drying was performed at a drying temperature of 60 ° C. for 30 seconds.
  • a triacetylcellulose film (C6) having a water content of 1.3% by weight was obtained in the same manner as in Example 1 except that drying was performed at a drying temperature of 80 ° C. for 10 seconds.
  • a triacetylcellulose film (C7) having a water content of 1.4% by weight was obtained in the same manner as in Example 1 except that drying was performed at a drying temperature of 80 ° C. for 30 seconds.
  • a triacetyl cellulose film (C8) having a water content of 4.5% by weight was obtained by carrying out in the same manner as in Example 1 except that drying was not performed.
  • Triacetyl cellulose film (1) Z polarizer A polarizing plate (1A) comprising a Z (meth) acrylic resin film was prepared. Specifically, the triacetyl cellulose film (1) was obtained on one side of the polarizer obtained in Production Example 1 and the (meth) acrylic resin film was obtained on the other side of the polarizer in Production Example 3. The resulting polybulualcohol-based adhesive aqueous solution (A) was attached to obtain a polarizing plate (1A). Polyvinyl alcohol adhesive water-soluble Liquid (A) was applied to triacetyl cellulose film (1) and (meth) acrylic resin film, respectively, and dried at 70 ° C. for 10 minutes to obtain polarizing plate (1A). The curl amount of the obtained polarizing plate (1A) was measured and found to be 1 mm. The results are shown in Table 1.
  • a polarizing plate (2A) was produced in the same manner as in Example 3 except that the triacetylcellulose film (2) was used instead of the triacetyl cellulose film (1).
  • the curl amount of the obtained polarizing plate (2A) was measured and found to be 3 mm. The results are shown in Table 1.
  • An array and a polarizing plate (C1A) were prepared in the same manner as in Example 3 except that the triacetylcellulose film (C1) was used instead of the triacetylcellulose film (1).
  • the curling amount of the obtained polarizing plate (C1A) was measured to be _8 mm. The results are shown in Table 1.
  • a polarizing plate (C2A) was produced in the same manner as in Example 3 except that the triacetylcellulose film (C2) was used instead of the triacetyl cellulose film (1).
  • the curl amount of the obtained polarizing plate (C2A) was measured and found to be 10 mm. The results are shown in Table 1.
  • a polarizing plate (C3A) was produced in the same manner as in Example 3 except that a triacetylcellulose film (C3) was used instead of the triacetylcellulose film (1).
  • the curl amount of the obtained polarizing plate (C3A) was measured and found to be 18 mm. The results are shown in Table 1.
  • An array and a polarizing plate (C4A) were prepared in the same manner as in Example 3 except that the triacetylcellulose film (C4) was used instead of the triacetyl cellulose film (1).
  • the curl amount of the obtained polarizing plate (C4A) was measured to be _15 mm. The results are shown in Table 1.
  • An array and a polarizing plate (C5A) were prepared in the same manner as in Example 3 except that the triacetylcellulose film (C5) was used instead of the triacetyl cellulose film (1).
  • the curl amount of the obtained polarizing plate (C5A) was measured to be _15 mm. The results are shown in Table 1.
  • a polarizing plate (C6A) was produced in the same manner as in Example 3 except that a triacetylcellulose film (C6) was used instead of the triacetylcellulose film (1).
  • the curl amount of the obtained polarizing plate (C6A) was measured and found to be 16 mm. The results are shown in Table 1.
  • An array and a polarizing plate (C7A) were produced in the same manner as in Example 3 except that the triacetylcellulose film (C7) was used instead of the triacetyl cellulose film (1).
  • the curl amount of the obtained polarizing plate (C7A) was measured to be _14 mm. The results are shown in Table 1.
  • An array and a polarizing plate (C8A) were prepared in the same manner as in Example 3 except that the triacetylcellulose film (C8) was used instead of the triacetyl cellulose film (1).
  • the curl amount of the obtained polarizing plate (C8A) was measured and found to be 10 mm. The results are shown in Table 1.
  • the occurrence of curling can be remarkably suppressed.
  • the water content of the triacetyl cellulose film is less than 3.1% by weight or more than 4.0% by weight (Comparative Examples 9 to 16)
  • a polarizing plate (1A) having a composition of triacetyl cellulose film (1) / polarizer / (meth) acrylic resin film was produced. Specifically, the triacetyl cellulose film (1) was obtained on one side of the polarizer obtained in Production Example 1, and the (meth) acrylic resin film was obtained on the other side of the polarizer in Production Example 4. The resulting polybulualcohol-based adhesive aqueous solution (B) was bonded to obtain a polarizing plate (1B). Polyvinyl alcohol adhesive aqueous solution (B) was applied to triacetyl cellulose film (1) and (meth) acrylic resin film, respectively, and dried at 70 ° C for 10 minutes to obtain polarizing plate (1B). It was. The curl amount of the obtained polarizing plate (1B) was measured to be _lmm. When the number of knick defects in the obtained polarizing plate (1B) was measured, it was 0. The results are shown in Table 2.
  • An array and a polarizing plate (2B) were prepared in the same manner as in Example 5 except that the triacetyl cellulose film (2) was used instead of the triacetyl cellulose film (1).
  • the curl amount of the obtained polarizing plate (2B) was measured and found to be 3 mm.
  • the number of knick defects in the obtained polarizing plate (2B) was measured and found to be 0. The results are shown in Table 2.
  • Example 5 the polyvinyl alcohol-based adhesive aqueous solution (C) obtained in Production Example 5 was used in place of the polybulualcohol-based adhesive aqueous solution (B) obtained in Production Example 4. Was carried out in the same manner as in Example 5 to produce a polarizing plate (3B).
  • the curl amount of the obtained polarizing plate (3B) was measured and found to be 3 mm.
  • the number of knick defects in the obtained polarizing plate (3B) was measured and found to be 32.
  • Table 2 The results are shown in Table 2.
  • Example 6 except that the polyvinyl alcohol-based adhesive aqueous solution (C) obtained in Production Example 5 was used in place of the polyvinyl alcohol-based adhesive aqueous solution (B) obtained in Production Example 4. Was carried out in the same manner as in Example 6 to produce a polarizing plate (4B).
  • the curl amount of the obtained polarizing plate (4B) was measured and found to be Omm.
  • the number of knick defects in the obtained polarizing plate (4B) was measured and found to be 29. The results are shown in Table 2.
  • Triacetyl cellulose film (C1) instead of triacetyl cellulose film (1)
  • a polarizing plate (C1B) was produced in the same manner as in Example 5 except that was used.
  • the curl amount of the obtained polarizing plate (C1B) was measured and found to be 8 mm.
  • the number of knack defects of the obtained polarizing plate (C1B) was measured and found to be 0.
  • the results are shown in Table 2.
  • An array and a polarizing plate (C2B) were prepared in the same manner as in Example 5 except that the triacetylcellulose film (C2) was used instead of the triacetyl cellulose film (1).
  • the curl amount of the obtained polarizing plate (C2B) was measured to be _10 mm.
  • the number of knack defects of the obtained polarizing plate (C2B) was measured and found to be 0. The results are shown in Table 2.
  • An array and a polarizing plate (C3B) were prepared in the same manner as in Example 5 except that the triacetylcellulose film (C3) was used instead of the triacetyl cellulose film (1).
  • the curling amount of the obtained polarizing plate (C3B) was measured to be _18 mm.
  • the number of knack defects of the obtained polarizing plate (C3B) was measured and found to be 0. The results are shown in Table 2.
  • a triacetyl cellulose film (C4) was used in place of the triacetyl cellulose film (1), and the polyvinyl alcohol adhesive solution (C) obtained in Production Example 5 was used instead of the polybutyl alcohol adhesive solution (B).
  • a polarizer and a polarizing plate (C4B) were produced in the same manner as in Example 5 except that the above was used.
  • the curl amount of the obtained polarizing plate (C4B) was measured and found to be -15 mm.
  • the number of knick defects in the obtained polarizing plate (C4B) was measured and found to be 28. The results are shown in Table 2.
  • An array and a polarizing plate (C5B) were prepared in the same manner as in Example 5 except that the triacetylcellulose film (C5) was used instead of the triacetyl cellulose film (1).
  • the curl amount of the obtained polarizing plate (C5B) was measured to be _15 mm.
  • the number of knack defects of the obtained polarizing plate (C5B) was measured and found to be 0. The results are shown in Table 2.
  • An array and a polarizing plate (C6B) were prepared in the same manner as in Example 5 except that the triacetylcellulose film (C6) was used instead of the triacetyl cellulose film (1). Obtained polarizing plate The curl amount of (C6B) was measured and found to be 16 mm. The number of knack defects of the obtained polarizing plate (C6B) was measured to be 2. The results are shown in Table 2.
  • An array and a polarizing plate (C7B) were prepared in the same manner as in Example 5 except that the triacetylcellulose film (C7) was used instead of the triacetyl cellulose film (1).
  • the curl amount of the obtained polarizing plate (C7B) was measured to be _14 mm.
  • the number of knack defects of the obtained polarizing plate (C7B) was measured, it was 1.
  • the results are shown in Table 2.
  • An array and a polarizing plate (C8B) were prepared in the same manner as in Example 5 except that the triacetylcellulose film (C8) was used instead of the triacetyl cellulose film (1).
  • the curl amount of the obtained polarizing plate (C8B) was measured and found to be 10 mm.
  • the number of knack defects of the obtained polarizing plate (C8B) was measured and found to be 1. The results are shown in Table 2.
  • Comparative Example 20 except that the polyvinyl alcohol-based adhesive aqueous solution (B) obtained in Production Example 4 was used in place of the polybutyl alcohol-based adhesive aqueous solution (C) obtained in Production Example 5.
  • a polarizing plate (C9B) was produced.
  • the curl amount of the obtained polarizing plate (C9B) was measured and found to be 15 mm.
  • the number of knick defects in the obtained polarizing plate (C9B) was measured and found to be 0.
  • Table 2 The results are shown in Table 2.
  • the polarizer protective film and polarizing plate of the present invention can be suitably used for various image display devices (liquid crystal display devices, organic EL display devices, PDPs, etc.).

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  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Nonlinear Science (AREA)
  • Optics & Photonics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Polarising Elements (AREA)

Abstract

Cette invention concerne simplement un film de protection de polariseur, qui est en mesure de supprimer l'apparition de recroquevillement à un niveau élevé, fournit simplement une plaque de polarisation, qui est en mesure de supprimer l'apparition de recroquevillement à un niveau élevé, est moins susceptible de causer une séparation dans l'état dans lequel il est stratifié sur une cellule à cristaux liquides et présente une excellente apparence, et elle concerne un dispositif d'affichage d'image à haute définition utilisant la plaque de polarisation. Le film de protection de polariseur est composé principalement d'une résine cellulosique et a un contenu en eau de 3,1 % en poids à 4,0 % en poids. La plaque de polarisation comprend une couche protectrice prévue sur les deux côtés d'un polariseur. Au moins une des couches protectrices est une couche de résine cellulosique, et cette même couche de résine cellulosique est formée en utilisant le film de protection de polariseur.
PCT/JP2007/061067 2006-06-14 2007-05-31 Film de protection de polariseur, plaque de polarisation et affichage d'image WO2007145081A1 (fr)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009054375A1 (fr) * 2007-10-22 2009-04-30 Nitto Denko Corporation Plaque de polarisation, son procédé de fabrication, film optique et dispositif d'affichage d'image
WO2009054376A1 (fr) * 2007-10-24 2009-04-30 Nitto Denko Corporation Plaque polarisante, film optique et dispositif d'affichage d'image
JP2009139662A (ja) * 2007-12-06 2009-06-25 Nitto Denko Corp 偏光板、光学フィルムおよび画像表示装置
JP2009139660A (ja) * 2007-12-06 2009-06-25 Nitto Denko Corp 偏光板、その製造方法、光学フィルムおよび画像表示装置
JP2009139753A (ja) * 2007-12-07 2009-06-25 Nitto Denko Corp 偏光板、光学フィルムおよび画像表示装置
JP2009139658A (ja) * 2007-12-06 2009-06-25 Nitto Denko Corp 積層光学フィルム
JP2009139661A (ja) * 2007-12-06 2009-06-25 Nitto Denko Corp 偏光板、光学フィルムおよび画像表示装置
JP2011107686A (ja) * 2009-10-22 2011-06-02 Sumitomo Chemical Co Ltd 光学積層体及びその製造方法
US9507202B2 (en) 2012-05-24 2016-11-29 Fujifilm Corporation Polarization plate and liquid crystal display

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JP5010994B2 (ja) * 2006-06-28 2012-08-29 日東電工株式会社 粘着型光学フィルムおよび画像表示装置
CN108700700B (zh) * 2016-02-26 2021-01-05 日东电工株式会社 起偏镜、单侧保护偏振膜、带粘合剂层的偏振膜、以及图像显示装置及其连续制造方法

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JP2002322558A (ja) * 2001-04-25 2002-11-08 Konica Corp 薄膜形成方法、光学フィルム、偏光板及び画像表示装置
JP2003307623A (ja) * 2002-04-18 2003-10-31 Kuraray Co Ltd 偏光板
JP2005070097A (ja) * 2003-08-25 2005-03-17 Nitto Denko Corp 積層光学フィルム、楕円偏光板および画像表示装置

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Publication number Priority date Publication date Assignee Title
JPH07198945A (ja) * 1993-12-27 1995-08-01 Nippon Synthetic Chem Ind Co Ltd:The 偏光板
JP2002322558A (ja) * 2001-04-25 2002-11-08 Konica Corp 薄膜形成方法、光学フィルム、偏光板及び画像表示装置
JP2003307623A (ja) * 2002-04-18 2003-10-31 Kuraray Co Ltd 偏光板
JP2005070097A (ja) * 2003-08-25 2005-03-17 Nitto Denko Corp 積層光学フィルム、楕円偏光板および画像表示装置

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009054375A1 (fr) * 2007-10-22 2009-04-30 Nitto Denko Corporation Plaque de polarisation, son procédé de fabrication, film optique et dispositif d'affichage d'image
US8331025B2 (en) 2007-10-22 2012-12-11 Nitto Denko Corporation Polarizing plate, manufacturing method thereof, optical film and image display
WO2009054376A1 (fr) * 2007-10-24 2009-04-30 Nitto Denko Corporation Plaque polarisante, film optique et dispositif d'affichage d'image
US8824047B2 (en) 2007-10-24 2014-09-02 Nitto Denko Corporation Polarizing plate, optical film and image display
JP2009139662A (ja) * 2007-12-06 2009-06-25 Nitto Denko Corp 偏光板、光学フィルムおよび画像表示装置
JP2009139660A (ja) * 2007-12-06 2009-06-25 Nitto Denko Corp 偏光板、その製造方法、光学フィルムおよび画像表示装置
JP2009139658A (ja) * 2007-12-06 2009-06-25 Nitto Denko Corp 積層光学フィルム
JP2009139661A (ja) * 2007-12-06 2009-06-25 Nitto Denko Corp 偏光板、光学フィルムおよび画像表示装置
JP2009139753A (ja) * 2007-12-07 2009-06-25 Nitto Denko Corp 偏光板、光学フィルムおよび画像表示装置
JP2011107686A (ja) * 2009-10-22 2011-06-02 Sumitomo Chemical Co Ltd 光学積層体及びその製造方法
US9507202B2 (en) 2012-05-24 2016-11-29 Fujifilm Corporation Polarization plate and liquid crystal display

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