WO2013103054A1 - ヨウ素系偏光子、偏光板、光学フィルムおよび画像表示装置 - Google Patents
ヨウ素系偏光子、偏光板、光学フィルムおよび画像表示装置 Download PDFInfo
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- WO2013103054A1 WO2013103054A1 PCT/JP2012/079815 JP2012079815W WO2013103054A1 WO 2013103054 A1 WO2013103054 A1 WO 2013103054A1 JP 2012079815 W JP2012079815 W JP 2012079815W WO 2013103054 A1 WO2013103054 A1 WO 2013103054A1
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- iodine
- polarizer
- polarizing plate
- reducing agent
- film
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Classifications
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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
- 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
- G02B5/3041—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 comprising multiple thin layers, e.g. multilayer stacks
- G02B5/305—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 comprising multiple thin layers, e.g. multilayer stacks including organic materials, e.g. polymeric layers
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/08—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of polarising materials
-
- 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
Definitions
- the present invention relates to an iodine-based polarizer.
- the present invention also relates to a polarizing plate and an optical film using the iodine-based polarizer.
- the present invention relates to an image display device such as a liquid crystal display device, an organic EL display device, and a PDP using the iodine-based polarizer, polarizing plate, and optical film.
- Liquid crystal display devices are used in personal computers, TVs, monitors, mobile phones, PDAs and the like.
- a polarizer used for a liquid crystal display device or the like a dyed polyvinyl alcohol film has been used because it has both high transmittance and high degree of polarization.
- the polarizer is produced by subjecting a polyvinyl alcohol film to various treatments such as swelling, dyeing, cross-linking, and stretching in a bath, followed by washing treatment and drying.
- the said polarizer is normally used as a polarizing plate by which protective films, such as a triacetyl cellulose, were bonded to the single side
- liquid crystal display devices have been improved in performance, and liquid crystal panels are required to have improved contrast in order to obtain high visibility. That is, it is desired that black is black and white is whiter and brighter, and accordingly, further improvement in the polarization performance of the polarizer is required. Therefore, it is very important for the polarization performance to have a high transmittance while having a high degree of polarization.
- a polarizer As a method for producing a polarizer, after an unoriented polyvinyl alcohol film is swollen in a swelling bath, iodine is adsorbed in an iodine dyeing bath, and further, treatment such as crosslinking and stretching is performed in an aqueous solution containing boric acid.
- Patent Document 1 It has also been proposed to swell a polyvinyl alcohol-based film, then heat and humidify it, then perform iodine dyeing treatment, and perform strong stretching after weak stretching (Reference 2).
- An object of the present invention is to provide an iodine polarizer that satisfies the optical characteristics of high transmittance and high degree of polarization and can suppress light leakage on the short wavelength side.
- Another object of the present invention is to provide a polarizing plate and an optical film using the iodine polarizer. Furthermore, this invention aims at providing the image display apparatus using the said iodine polarizer, a polarizing plate, and an optical film.
- the present invention is an iodine polarizer in which iodine is adsorbed and oriented on a polyvinyl alcohol film,
- the iodine polarizer has been treated with a treatment bath containing at least one reducing agent, and the iodine polarizer contains an oxidant of the reducing agent, and the total of the reducing agent and its oxidant.
- the present invention relates to an iodine-based polarizer characterized by having a content of 0.06 ⁇ 10 ⁇ 6 to 1.6 ⁇ 10 ⁇ 6 mol / g.
- Examples of the reducing agent include at least one of ascorbic acid, erythorbic acid, thiosulfuric acid, sulfurous acid, and salts thereof.
- the present invention also relates to a polarizing plate having a transparent protective film on at least one side of the iodine-based polarizer.
- the present invention also relates to an optical film comprising the iodine polarizer or the polarizing plate.
- the present invention also relates to an image display device comprising the iodine polarizer, a polarizing plate or an optical film.
- the iodine based polarizer iodine on a polyvinyl alcohol film is adsorbed and oriented, iodine complex which formed during the polarizer (I 3 - iodine complex and I 5 - iodine complex) light of a visible wavelength region By absorbing the light, polarization characteristics are exhibited. From this point of view, in order to suppress light leakage of the polarizer, it is desirable to arrange the iodine complexes in the polarizer in a highly oriented manner. When an iodine complex having low orientation is present in the polarizer, the optical properties of the polarizer are degraded.
- a low-orientation iodine complex present in the polarizer can be preferentially reduced and removed by containing a predetermined amount of a reducing agent.
- a highly oriented iodine complex can be selectively present in the polarizer, and the characteristics of the polarizer can be improved.
- the iodine type polarizer of the present invention it is possible to satisfy the optical characteristics of high transmittance and high degree of polarization.
- I 3 orientation of the polyvinyl alcohol film in a reducing agent - iodine complex is reduced preferentially, since it is removed, I 3 present in the polarizer - When enhanced orientation of iodine complex thought It is done. I 3 - Since iodine complex is involved in the absorbance of short wavelength range of the polarizer, is considered possible to improve light leakage of a short wavelength region in the cross state of the polarizer (blue leak).
- a film having translucency in the visible light region and capable of dispersing and adsorbing iodine can be used without particular limitation.
- a polyvinyl alcohol film having a thickness of about 10 to 300 ⁇ m is used. The thickness is preferably 20 to 100 ⁇ m.
- polyvinyl alcohol film for example, a polyvinyl alcohol film conventionally used for a polarizer is preferably used.
- the material for the polyvinyl alcohol film include polyvinyl alcohol and derivatives thereof.
- Derivatives of polyvinyl alcohol include polyvinyl formal, polyvinyl acetal and the like, olefins such as ethylene and propylene, unsaturated carboxylic acids such as acrylic acid, methacrylic acid and crotonic acid and alkyl esters thereof, acrylamide and the like. Can be given.
- the degree of polymerization of polyvinyl alcohol is preferably about 100 to 10,000, and more preferably 1,000 to 10,000. A saponification degree of about 80 to 100 mol% is generally used.
- polyvinyl alcohol films include hydrophilic polymer films such as partially saponified ethylene / vinyl acetate copolymers, polyene-based oriented films such as dehydrated polyvinyl alcohol and dehydrochlorinated polyvinyl chloride. Etc.
- the polyvinyl alcohol film may contain additives such as a plasticizer and a surfactant.
- a plasticizer include polyols and condensates thereof, and examples thereof include glycerin, diglycerin, triglycerin, ethylene glycol, propylene glycol, and polyethylene glycol.
- the amount of the plasticizer used is not particularly limited, but is preferably 20% by weight or less in the polyvinyl alcohol film.
- the iodine-based polarizer of the present invention is one in which iodine is adsorbed and oriented on a polyvinyl alcohol-based film.
- Such an iodine polarizer can be obtained, for example, by subjecting a polyvinyl alcohol film to at least a dyeing process, a crosslinking process and a stretching process.
- a dyeing process, the crosslinking process, and the stretching process treatment baths such as a dyeing bath, a crosslinking bath, and a stretching bath are used, respectively, and each of these treatment baths uses a treatment liquid (such as an aqueous solution) according to each process.
- the dyeing process is performed by adsorbing and orienting iodine on the polyvinyl alcohol film.
- the dyeing process can be performed together with the stretching process.
- Dyeing is generally performed by immersing the film in an iodine solution.
- an iodine aqueous solution used as the iodine solution an aqueous solution containing iodine ions with iodine and an iodide compound which is a dissolution aid is used.
- Examples of the iodide compound include potassium iodide, lithium iodide, sodium iodide, zinc iodide, aluminum iodide, lead iodide, copper iodide, barium iodide, calcium iodide, tin iodide, and titanium iodide. Etc. are used.
- potassium iodide is preferred.
- the iodide compound used in the present invention is the same as described above when used in other steps.
- the iodine concentration in the iodine solution is about 0.01 to 10% by weight, preferably 0.02 to 5% by weight, and more preferably 0.02 to 0.5% by weight.
- the iodide compound concentration is preferably about 0.1 to 10% by weight, more preferably 0.2 to 8% by weight.
- the temperature of the iodine solution is usually about 20 to 50 ° C., preferably 25 to 40 ° C.
- the immersion time is usually about 10 to 300 seconds, preferably 20 to 240 seconds.
- the crosslinking step is performed using a boron compound as a crosslinking agent.
- the order of the crosslinking steps is not particularly limited.
- the crosslinking step can be performed together with the dyeing step and the stretching step.
- the crosslinking step can be performed multiple times.
- Examples of the boron compound include boric acid and borax.
- the boron compound is generally used in the form of an aqueous solution or a water-organic solvent mixed solution. Usually, an aqueous boric acid solution is used.
- the boric acid concentration in the boric acid aqueous solution is about 1 to 10% by weight, preferably 2 to 7% by weight. In order to impart heat resistance depending on the degree of crosslinking, the boric acid concentration is preferably used.
- the boric acid aqueous solution or the like can contain an iodide compound such as potassium iodide.
- an iodide compound such as potassium iodide.
- the iodide compound concentration is preferably about 0.1 to 10% by weight, more preferably 0.5 to 8% by weight.
- the crosslinking step can be performed by immersing the polyvinyl alcohol film in a boric acid aqueous solution or the like.
- the treatment temperature in the crosslinking step is usually 25 ° C. or higher, preferably 30 to 85 ° C., more preferably 30 to 60 ° C.
- the treatment time is usually about 5 to 800 seconds, preferably about 8 to 500 seconds.
- the stretching step is usually performed by uniaxial stretching.
- This stretching method can be applied together with the dyeing process and the crosslinking process.
- wet stretching is used as the stretching method.
- stretching is generally performed after the dyeing step.
- stretching can be performed together with the crosslinking step.
- the stretching process can be performed in multiple stages.
- An iodide compound such as potassium iodide can be contained in the treatment liquid used in the wet stretching method.
- the iodide compound concentration is preferably about 0.1 to 10% by weight, more preferably 0.2 to 5% by weight.
- the treatment temperature in the wet stretching method is usually 25 ° C. or higher, preferably 30 to 85 ° C., more preferably 50 to 70 ° C.
- the immersion time is usually about 10 to 800 seconds, preferably about 30 to 500 seconds.
- the total stretching ratio is 3 to 10 times the total stretching ratio with respect to the original length of the polyvinyl alcohol film. Preferably it is 4 to 8 times, more preferably 5 to 7 times. That is, the total draw ratio refers to a cumulative draw ratio including stretching in those steps when stretching is involved in a swelling process described later other than the stretching process.
- the total draw ratio is appropriately determined in consideration of the draw ratio in the swelling process and the like. When the total draw ratio is low, the orientation is insufficient and it is difficult to obtain a polarizer having high optical properties (polarization degree). On the other hand, if the total draw ratio is too high, stretch breakage is likely to occur, and the polarizer becomes too thin, which may reduce the workability in the subsequent process.
- the dyeing step, the crosslinking step, and the stretching step are performed, but a swelling step can be performed before the steps are performed.
- a swelling step can be performed before the steps are performed.
- the treatment liquid used in the swelling process water, distilled water, or pure water is usually used. If the main component is water, the treatment liquid may contain a small amount of an iodide compound such as potassium iodide, an additive such as a surfactant, alcohol and the like. Further, when an iodide compound is contained in the treatment liquid, the iodide compound concentration is preferably about 0.1 to 10% by weight, more preferably 0.2 to 5% by weight.
- the treatment temperature in the swelling step is usually preferably adjusted to about 20 to 45 ° C. Further, it is preferably 25 to 40 ° C. In addition, if there is swelling unevenness, the portion becomes uneven coloring in the dyeing process, so that swelling unevenness is not generated.
- the immersion time is usually about 10 to 300 seconds, preferably 20 to 240 seconds.
- the draw ratio is usually 6.5 times or less with respect to the original length of the polyvinyl alcohol film.
- the draw ratio is preferably 1.2 to 6.5 times, more preferably 2 to 4 times, and even more preferably 2 to 3 times.
- the dyeing step In the production of the iodine-based polarizer of the present invention, at least the dyeing step, the crosslinking step and the stretching step are performed.
- metal ion treatment can be performed.
- the metal ion treatment is performed by immersing a polyvinyl alcohol film in an aqueous solution containing a metal salt.
- Various metal ions can be contained in the polyvinyl alcohol film by the metal ion treatment.
- metal ions of transition metals such as cobalt, nickel, zinc, chromium, aluminum, copper, manganese, and iron are particularly preferably used from the viewpoint of color tone adjustment and durability.
- metal ions zinc ions are preferable from the viewpoints of color tone adjustment and heat resistance.
- the zinc salt include zinc halides such as zinc chloride and zinc iodide, zinc sulfate, and zinc acetate.
- the washing step can be performed after the dyeing step, the crosslinking step and the stretching step.
- the washing step can be performed with an iodine compound solution such as potassium iodide.
- the iodine compound concentration in the iodine compound solution is usually in the range of about 0.5 to 10% by weight, more preferably 0.5 to 8% by weight, and further 1 to 6% by weight.
- the treatment temperature is usually about 15 to 60 ° C., preferably 25 to 40 ° C.
- the immersion time is usually in the range of about 1 to 120 seconds, preferably 3 to 90 seconds.
- the stage of the washing process with the iodine compound solution is not particularly limited as long as it is before the drying process.
- a water washing process can be performed as a washing process.
- the water washing step is usually performed by immersing a polyvinyl alcohol film in pure water such as ion exchange water or distilled water.
- the water washing temperature is usually in the range of 5 to 50 ° C, preferably 10 to 45 ° C, more preferably 15 to 40 ° C.
- the immersion time is usually about 5 to 300 seconds, preferably about 10 to 240 seconds.
- the water washing step may be a combination of a washing step with an iodine compound solution and a water washing step, and a solution appropriately mixed with a liquid alcohol such as methanol, ethanol, isopropyl alcohol, butanol, or propanol can also be used.
- a liquid alcohol such as methanol, ethanol, isopropyl alcohol, butanol, or propanol
- a drying step is performed to manufacture a polarizer.
- a drying time and a drying temperature are appropriately set according to the moisture content required for the obtained polarizer (film).
- the drying temperature is usually controlled in the range of 20 to 150 ° C, preferably 40 to 100 ° C. If the drying temperature is too low, the drying time becomes longer, which is not preferable because efficient production cannot be performed. When the drying temperature is too high, the obtained polarizer is deteriorated and deteriorates in terms of optical properties and hue.
- the heat drying time is usually about 1 to 5 minutes.
- the iodine-based polarizer of the present invention is treated with a treatment bath containing at least one reducing agent and contains an oxidant of the reducing agent.
- the reducing agent include ascorbic acid (vitamin C), erythorbic acid, thiosulfuric acid, sulfurous acid, chlorogenic acid, citric acid, rosmarinic acid, and salts thereof.
- the salt include alkali metal salts such as sodium salt and potassium salt. Among these, ascorbic acid, erythorbate, thiosulfate, and sulfite are preferable. These reducing agents can be used alone or in combination of two or more.
- the oxidant contained in the iodine polarizer of the present invention is derived from the reducing agent contained in the polarizer.
- ascorbic acid when ascorbic acid is contained in the polarizer, ascorbic acid becomes dehydroascorbic acid which is an oxidized form of ascorbic acid after reducing the iodine complex.
- the reducing agent may be contained in at least one of the baths used in the step in the production of an iodine-based polarizer, or may be separately subjected to a treatment step using a treatment liquid containing the reducing agent. And can be contained in an iodine-based polarizer.
- the step of containing the reducing agent is preferably performed in a step after adding iodine to the polyville alcohol-based film by a dyeing step.
- the processing order of the dyeing step, the crosslinking step, and the stretching step is not particularly limited, but the case where the crosslinking step and the stretching step are performed after the dyeing step is suitably applied.
- a swelling process is first performed.
- a dyeing process is performed, at least one of these processes in the crosslinking process, the stretching process, the metal ion treatment process, the washing process, or the separate reducing agent treatment process.
- a reducing agent can be contained.
- crosslinking process, and an extending process can be performed by the collective process which performs a some process simultaneously.
- a reducing agent can be contained in the bath used in the batch process.
- a reducing agent can be contained in at least 1 process of the said multistage process.
- the total content of the reducing agent and its oxidant in the iodine-based polarizer of the present invention is 0.06 ⁇ 10 ⁇ 6 to 1.6 ⁇ 10 ⁇ 6 mol / g.
- the total content of the reducing agent and its oxidant is preferably 0.11 ⁇ 10 ⁇ 6 to 1.4 ⁇ 10 ⁇ 6 mol / g, more preferably 0.16 ⁇ 10 ⁇ 6 to 1.2 ⁇ . 10 ⁇ 6 mol / g is preferred.
- the content of the reducing agent and its oxidant is less than 0.06 ⁇ 10 ⁇ 6 mol / g, the polarization characteristics cannot be sufficiently improved, and light leakage on the short wavelength side cannot be sufficiently suppressed. .
- the concentration of the reducing agent in the aqueous solution of each bath containing the reducing agent is preferably 0.001 to 0.015% by weight, and more preferably 0.002 to 0.012% by weight.
- concentration is less than 0.001% by weight, the ratio of the reducing agent in the mixed aqueous solution decreases, and light leakage on the short wavelength side of the obtained iodine-based polarizer cannot be sufficiently suppressed.
- concentration exceeds 0.015% by weight, the ratio of the reducing agent in the bath increases, so that it becomes difficult to adjust the transmittance of the polarizer, and the productivity is remarkably deteriorated.
- the obtained iodine polarizer can be made into a polarizing plate provided with a transparent protective film on at least one side according to a conventional method.
- a transparent protective film for example, a thermoplastic resin excellent in transparency, mechanical strength, thermal stability, moisture barrier property, isotropy and the like is used.
- thermoplastic resins include cellulose resins such as triacetyl cellulose, polyester resins, polyethersulfone resins, polysulfone resins, polycarbonate resins, polyamide resins, polyimide resins, polyolefin resins, (meth) acrylic resins, Examples thereof include cyclic polyolefin resins (norbornene resins), polyarylate resins, polystyrene resins, polyvinyl alcohol resins, and mixtures thereof.
- a transparent protective film is bonded to one side of the polarizer by an adhesive layer. On the other side, as a transparent protective film, (meth) acrylic, urethane-based, acrylurethane-based, epoxy-based, silicone
- a thermosetting resin such as a system or an ultraviolet curable resin can be used.
- the thickness of the transparent protective film can be appropriately determined, but is generally about 1 to 500 ⁇ m from the viewpoints of workability such as strength and handleability, and thin layer properties. 1 to 300 ⁇ m is particularly preferable, and 5 to 200 ⁇ m is more preferable. The transparent protective film is particularly suitable when the thickness is from 5 to 150 ⁇ m.
- the protective film which consists of the same polymer material may be used by the front and back, and the protective film which consists of a different polymer material etc. may be used.
- a retardation plate having a retardation with a front retardation of 40 nm or more and / or a thickness direction retardation of 80 nm or more can be used as the transparent protective film.
- the front phase difference is usually controlled in the range of 40 to 200 nm
- the thickness direction phase difference is usually controlled in the range of 80 to 300 nm.
- the retardation plate functions also as a transparent protective film, so that the thickness can be reduced.
- the retardation plate examples include a birefringent film obtained by uniaxially or biaxially stretching a polymer material, a liquid crystal polymer alignment film, and a liquid crystal polymer alignment layer supported by a film.
- the thickness of the retardation plate is not particularly limited, but is generally about 20 to 150 ⁇ m.
- the film having the retardation can be separately attached to a transparent protective film having no retardation to give the above function.
- the transparent protective film may be subjected to a surface modification treatment before applying the adhesive.
- a surface modification treatment include corona treatment, plasma treatment, primer treatment, and saponification treatment.
- the surface of the transparent protective film to which the polarizer is not bonded may be subjected to a hard coat treatment, an antireflection treatment, an antisticking treatment, or a treatment for diffusion or antiglare.
- An adhesive is used for the adhesion treatment between the polarizer and the transparent protective film.
- the adhesive include isocyanate adhesives, polyvinyl alcohol adhesives, gelatin adhesives, vinyl latexes, and water-based polyesters.
- the adhesive is usually used as an adhesive made of an aqueous solution, and usually contains 0.5 to 60% by weight of a solid content.
- examples of the adhesive between the polarizer and the transparent protective film include an ultraviolet curable adhesive and an electron beam curable adhesive.
- the electron beam curable polarizing plate adhesive exhibits suitable adhesion to the various transparent protective films. In particular, it exhibits good adhesion even with respect to acrylic resins for which it was difficult to satisfy the adhesion.
- the adhesive used by this invention can be made to contain a metal compound filler.
- the polarizing plate of the present invention is produced by bonding the transparent protective film and the polarizer using the adhesive.
- the adhesive may be applied to either the transparent protective film or the polarizer, or to both. After the bonding, a drying process is performed to form an adhesive layer composed of a coating dry layer. Bonding of a polarizer and a transparent protective film can be performed with a roll laminator or the like.
- the thickness of the adhesive layer is not particularly limited, but is usually about 30 to 1000 nm.
- the polarizing plate of the present invention can be used as an optical film laminated with another optical layer in practical use.
- the optical layer is not particularly limited.
- a liquid crystal display device such as a reflection plate, a semi-transmission plate, a retardation plate (including wavelength plates such as 1/2 and 1/4), and a viewing angle compensation film.
- One or more optical layers that may be used can be used.
- a reflective polarizing plate or a semi-transmissive polarizing plate in which a polarizing plate or a semi-transmissive reflecting plate is further laminated on the polarizing plate of the present invention an elliptical polarizing plate or a circularly polarizing plate in which a retardation plate is further laminated on the polarizing plate.
- a wide viewing angle polarizing plate obtained by further laminating a viewing angle compensation film on a plate or a polarizing plate, or a polarizing plate obtained by further laminating a brightness enhancement film on the polarizing plate is preferable.
- An optical film in which the optical layer is laminated on a polarizing plate can be formed by a method of sequentially laminating separately in the manufacturing process of a liquid crystal display device or the like.
- an appropriate adhesive means such as an adhesive layer can be used for the lamination.
- their optical axes can be set at an appropriate arrangement angle in accordance with the target retardation characteristics.
- An adhesive layer for adhering to other members such as a liquid crystal cell may be provided on the polarizing plate described above or an optical film in which at least one polarizing plate is laminated.
- 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 appropriately selected.
- those having excellent optical transparency such as an acrylic pressure-sensitive adhesive, exhibiting appropriate wettability, cohesiveness, and adhesive pressure-sensitive adhesive properties, and being excellent in weather resistance, heat resistance and the like can be preferably used.
- Attaching an adhesive layer to one or both sides of a polarizing plate or an optical film can be performed by an appropriate method.
- a pressure-sensitive 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 an appropriate solvent alone or a mixture such as toluene and ethyl acetate is prepared.
- the method of moving up is mentioned.
- the pressure-sensitive adhesive layer can also be provided on one or both sides of a polarizing plate or an optical film as an overlapping layer of different compositions or types. Moreover, when providing in both surfaces, it can also be set as the adhesion layers of a different composition, a kind, thickness, etc. in the front and back of a polarizing plate or an optical film.
- the thickness of the pressure-sensitive adhesive layer can be appropriately determined according to the purpose of use and adhesive force, and is generally 1 to 500 ⁇ m, preferably 5 to 200 ⁇ m, and particularly preferably 10 to 100 ⁇ m.
- the exposed surface of the adhesive layer is temporarily covered with a separator for the purpose of preventing contamination until it is put to practical use. Thereby, it can prevent contacting an adhesion layer in the usual handling state.
- a separator for example, a suitable thin leaf body such as a plastic film, rubber sheet, paper, cloth, nonwoven fabric, net, foamed sheet or metal foil, or a laminate thereof, silicone type or Appropriate conventional ones such as those coated with an appropriate release agent such as long-chain alkyl, fluorine-based, or molybdenum sulfide can be used.
- the polarizer, the transparent protective film, the optical film, and the like that form the polarizing plate described above, and each layer such as the adhesive layer include, for example, salicylic acid ester compounds, benzophenol compounds, benzotriazole compounds, and cyanoacrylates. It may be one having a UV absorbing ability by a method such as a method of treating with an ultraviolet absorber such as a nickel compound or a nickel complex salt compound.
- the polarizing plate or optical film of the present invention can be preferably used for forming various devices such as a liquid crystal display device.
- the liquid crystal display device can be formed according to the conventional method.
- a liquid crystal display device is generally formed by appropriately assembling components such as a liquid crystal cell, a polarizing plate or an optical film, and an illumination system as necessary, and incorporating a drive circuit.
- a liquid crystal display device is generally formed by appropriately assembling components such as a liquid crystal cell, a polarizing plate or an optical film, and an illumination system as necessary, and incorporating a drive circuit.
- the liquid crystal cell any type such as a TN type, an STN type, or a ⁇ type can be used.
- liquid crystal display devices such as a liquid crystal display device in which a polarizing plate or an optical film is disposed on one side or both sides of a liquid crystal cell, or a backlight or a reflector used in an illumination system can be formed.
- the polarizing plate or optical film by this invention can be installed in the one side or both sides of a liquid crystal cell.
- a polarizing plate or an optical film on both sides they may be the same or different.
- a single layer or a suitable part such as a diffusion plate, an antiglare layer, an antireflection film, a protective plate, a prism array, a lens array sheet, a light diffusion plate, a backlight, Two or more layers can be arranged.
- Example 1 A polyvinyl alcohol film (VF-PS7500 manufactured by Kuraray Co., Ltd.) having an average degree of polymerization of 2400 and a thickness of 75 ⁇ m was used as the raw film. The following steps were performed on the polyvinyl alcohol film in the following order.
- VF-PS7500 manufactured by Kuraray Co., Ltd.
- the polyvinyl alcohol film subjected to the swelling treatment was conveyed to a dyeing bath and immersed in the iodine dyeing solution adjusted to 30 ° C. for 30 seconds, while being stretched uniaxially to a draw ratio of 3.3 times with respect to the original length, Stained.
- Crosslinking process As a treatment solution for the crosslinking bath, a mixed aqueous solution containing 3% by weight of boric acid and 3% by weight of potassium iodide was used. The treated polyvinyl alcohol film was conveyed to a crosslinking bath and uniaxially stretched to a total stretching ratio of 3.6 times the original length while being immersed in the mixed aqueous solution adjusted to 30 ° C. for 30 seconds.
- Example 2 the iodine polarizer was produced under the same conditions as in Example 1 except that the type of reducing agent, the bath relating to each step to which the reducing agent was added, and the concentration in the bath were changed as shown in Table 1. did.
- Comparative Example 1 a reducing agent is not blended in any bath.
- Ts single transmittance
- P polarization degree
- Polarization degree P (%) ⁇ (Tp ⁇ Tc) / (Tp + Tc) ⁇ 1/2 ⁇ 100
- Each transmittance is represented by a Y value obtained by correcting visibility with a two-degree field of view (C light source) of JIS Z8701, with 100% of the completely polarized light obtained through the Granteller prism polarizer.
- the measurement wavelength was 550 nm.
- the dichroic ratio was calculated by substituting the single transmittance (Ts (Y)) and the degree of polarization (P) into the following formula.
- the contrast at a wavelength of 410 nm was obtained by the following formula using the parallel transmittance at a wavelength of 410 nm (Tp 410 nm ) and the orthogonal transmittance at a wavelength of 410 nm (Tc 410 nm ).
- Contrast (Cr 410 nm ) parallel transmittance (Tp 410 nm ) / orthogonal transmittance (Tc 410 nm ) Note that these transmittances are Y values obtained by correcting the visibility with a J1SZ 8701 2 degree visual field (C light source).
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Abstract
Description
前記ヨウ素系偏光子は、少なくとも一つの還元剤を含有する処理浴による処理が施されており、且つ前記ヨウ素系偏光子は還元剤の酸化体を含有し、かつ還元剤およびその酸化体の合計含有量が0.06×10-6~1.6×10-6mol/gであることを特徴するヨウ素系偏光子、に関する。
原反フィルムとして、平均重合度2400、厚さ75μmのポリビニルアルコールフィルム((株)クラレ製のVF-PS7500)を用いた。当該ポリビニルアルコールフィルムに、下記の順番にて、下記各工程を施した。
膨潤浴の処理液としては、純水を用いた。上記ポリビニルアルコールフィルムを膨潤浴に搬送し、30℃に調整した純水中に1分間浸漬しながら2.2倍に延伸し、膨潤させた。
染色浴の処理液としては、ヨウ素濃度が0.045重量%で、ヨウ素とヨウ化カリウムをヨウ素:ヨウ化カリウム(重量比=1:7)のヨウ素染色溶液を用いた。上記膨潤処理されたポリビニルアルコールフィルムを染色浴に搬送し、30℃に調整した前記ヨウ素染色溶液に、30秒間浸漬しながら、元長に対して延伸倍率3.3倍まで、一軸延伸しながら、染色した。
架橋浴の処理液としては、ホウ酸を3重量%、ヨウ化カリウムを3重量%含有する混合水溶液を用いた。上記処理されたポリビニルアルコールフィルムを架橋浴に搬送し、30℃に調整した前記混合水溶液に、30秒間浸漬しながら、元長に対して総延伸倍率3.6倍まで、一軸延伸した。
延伸浴の処理液としては、ホウ酸を4重量%、ヨウ化カリウムを5重量%、還元剤としてアスコルビン酸を0.00125重量%含有する水溶液を用いた。上記処理されたポリビニルアルコールフィルムを延伸浴に搬送し、60℃に調整した水溶液に、60秒間浸漬しながら、元長に対して総延伸倍率6倍まで、一軸延伸した。
洗浄浴の処理液としては、ヨウ化カリウムを3重量%含有する水溶液を用いた。上記処理されたポリビニルアルコールフィルムを洗浄浴に搬送し、30℃に調整した当該水溶液に、10秒間浸漬した。
次いで、上記処理されたポリビニルアルコール系フィルムを、60℃のオーブンで4分間乾燥して、ヨウ素系偏光子を得た。
実施例1において、還元剤の種類、還元剤を添加した各工程に係る浴およびその浴における濃度を表1に示すように変えたこと以外は、実施例1と同条件でヨウ素偏光子を作製した。比較例1では、還元剤をいずれの浴にも配合していない。
実施例および比較例で得られたヨウ素系偏光子の光学特性を以下の方法により測定した。結果を表1に示す。
GPC(ゲル浸透クロマトグラフィ)(TOSOH,HLC-8120GPC)を用いて、偏光子1g中に存在する還元剤およびその酸化体の合計量(μg/g)の測定を行った。得られた測定結果を還元剤およびその酸化体の分子量で割った値を含有量(mol/g)とした。
偏光子の単体透過率(Ts)、偏光度(P)は、積分球付き分光光度計(日本分光(株)製のV7100)にて測定した。
なお、偏光度は、2枚の同じ偏光子を両者の透過軸が平行となるように重ね合わせた場合の透過率(平行透過率:Tp)および、両者の透過軸が直交するように重ね合わせた場合の透過率(直交透過率:Tc)を以下の式に適用することにより求められるものである。
偏光度P(%)={(Tp-Tc)/(Tp+Tc)}1/2×100
各透過率は、グランテラープリズム偏光子を通して得られた完全偏光を100%として、JIS Z8701の2度視野(C光源)により視感度補整したY値で示したものである。測定波長は、波長550nmであった。
波長410nmのコントラスト(Cr410nm)は、波長410nmの平行透過率(Tp410nm)と波長410nmの直交透過率(Tc410nm)を用いて、下記式の計算式によって求めた。
コントラスト(Cr410nm)=平行透過率(Tp410nm)/直交透過率(Tc410nm)
なお、これらの透過率は、JlSZ 8701の2度視野(C光源)により、視感度補正を行ったY値である。
Claims (5)
- ポリビニルアルコール系フィルムにヨウ素が吸着配向されているヨウ素系偏光子であって、
前記ヨウ素系偏光子は、少なくとも一つの還元剤を含有する処理浴による処理が施されており、且つ前記ヨウ素系偏光子は還元剤の酸化体を含有し、かつ還元剤およびその酸化体の合計含有量が0.06×10-6~1.6×10-6mol/gであることを特徴するヨウ素系偏光子。 - 前記還元剤が、アスコルビン酸、エリソルビン酸、チオ硫酸、亜硫酸およびこれらの塩のいずれか少なくとも1種類を含むことを特徴する請求項1記載のヨウ素系偏光子。
- 請求項1または2記載のヨウ素偏光子の少なくとも片面に、透明保護フィルムを有することを特徴とする偏光板。
- 請求項1もしくは2記載のヨウ素偏光子または請求項3記載の偏光板を有すことを特徴とする光学フィルム。
- 請求項1もしくは2記載のヨウ素偏光子、請求項3記載の偏光板または請求項4記載の光学フィルムを有することを特徴とする画像表示装置。
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US14/366,869 US10025014B2 (en) | 2012-01-05 | 2012-11-16 | Iodine-based polarizer, polarizing plate, optical film, and image display device |
CN201280066331.4A CN104040386B (zh) | 2012-01-05 | 2012-11-16 | 碘系偏振片、偏振板、光学膜及图像显示装置 |
KR1020147014237A KR101940849B1 (ko) | 2012-01-05 | 2012-11-16 | 요오드계 편광자, 편광판, 광학 필름 및 화상 표시 장치 |
US15/986,240 US10620353B2 (en) | 2012-01-05 | 2018-05-22 | Iodine-based polarizer, polarizing plate, optical film, and image display device |
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US15/986,240 Division US10620353B2 (en) | 2012-01-05 | 2018-05-22 | Iodine-based polarizer, polarizing plate, optical film, and image display device |
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JP2015180921A (ja) * | 2014-03-05 | 2015-10-15 | 富士フイルム株式会社 | 偏光板、および、これを含む液晶表示装置 |
JP6610020B2 (ja) * | 2014-06-23 | 2019-11-27 | 三菱ケミカル株式会社 | 偏光フィルムの製造方法及び偏光板の製造方法 |
WO2016056600A1 (ja) * | 2014-10-08 | 2016-04-14 | 株式会社クラレ | 偏光フィルム |
KR20160080335A (ko) | 2014-12-29 | 2016-07-08 | 동우 화인켐 주식회사 | 편광자의 제조방법 |
KR20160096385A (ko) | 2015-02-05 | 2016-08-16 | 동우 화인켐 주식회사 | 편광자의 제조방법 |
EP3339008A1 (en) * | 2016-12-21 | 2018-06-27 | Carl Zeiss Vision International GmbH | Method for producing a polarizer and an optical lens |
KR101992004B1 (ko) * | 2016-12-21 | 2019-06-21 | 삼성에스디아이 주식회사 | 편광자, 이의 제조방법, 이를 포함하는 편광판 및 이를 포함하는 디스플레이 장치 |
WO2018186244A1 (ja) * | 2017-04-03 | 2018-10-11 | 日東電工株式会社 | 偏光子および偏光板 |
WO2018186243A1 (ja) * | 2017-04-03 | 2018-10-11 | 日東電工株式会社 | 偏光子の製造方法 |
TWI640555B (zh) * | 2017-08-16 | 2018-11-11 | 住友化學股份有限公司 | 用於製造偏光膜的方法和系統 |
JP7058230B2 (ja) * | 2018-04-09 | 2022-04-21 | 日東電工株式会社 | 偏光子の製造方法 |
JP7058231B2 (ja) * | 2018-04-09 | 2022-04-21 | 日東電工株式会社 | 偏光子の製造方法 |
KR20210070276A (ko) * | 2018-09-28 | 2021-06-14 | 닛토덴코 가부시키가이샤 | 편광자의 제조 방법 |
CN115244440A (zh) | 2020-03-13 | 2022-10-25 | 株式会社可乐丽 | 偏振膜和其制造方法 |
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US10620353B2 (en) | 2020-04-14 |
CN104040386B (zh) | 2017-03-29 |
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JP2013156621A (ja) | 2013-08-15 |
CN104040386A (zh) | 2014-09-10 |
US10025014B2 (en) | 2018-07-17 |
KR101940849B1 (ko) | 2019-01-21 |
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