WO2013154139A1 - 偏光素子及び偏光板 - Google Patents
偏光素子及び偏光板 Download PDFInfo
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- WO2013154139A1 WO2013154139A1 PCT/JP2013/060862 JP2013060862W WO2013154139A1 WO 2013154139 A1 WO2013154139 A1 WO 2013154139A1 JP 2013060862 W JP2013060862 W JP 2013060862W WO 2013154139 A1 WO2013154139 A1 WO 2013154139A1
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- Prior art keywords
- polarizing element
- group
- polarizing plate
- polarizing
- weight
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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
- G02B5/3083—Birefringent or phase retarding elements
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2073—Polarisers in the lamp house
Definitions
- the present invention relates to a polarizing element, a polarizing plate using the polarizing element, and a manufacturing method thereof.
- a polarizing element is generally produced by adsorbing and orienting a dichroic dye on a polyvinyl alcohol resin film.
- the dichroic dye iodine or a dichroic dye is used. At least one surface of the polarizing element is bonded with a protective film made of triacetyl cellulose through an adhesive layer to form a polarizing plate.
- a polarizing plate using iodine as a dichroic dye is called an iodine polarizing plate, while a polarizing plate using a dichroic dye such as an azo compound is called a dye polarizing plate.
- the dye-based polarizing plate has a problem that the transmittance is low compared with the iodine-based polarizing plate having the same degree of polarization, that is, the contrast is low, but it has high heat resistance and high humidity heat durability. Because of its characteristics, it is used in color liquid crystal projectors. In the case of a color liquid crystal projector, a polarizing plate is used for the liquid crystal image forming portion. However, light is greatly absorbed by the polarizing plate, and an image that is projected from several tens of inches to hundreds of tens of inches is reduced to 0.5. In order to collect light on a polarizing plate having a small area of ⁇ 6 inches, deterioration due to light and the influence of heat upon irradiation with light are inevitable due to the size of the light density.
- Patent Documents 1 to 5 disclose the techniques of these patents.
- the techniques of these patents are not limited to the improvement in durability in the case of a dye-type polarizing plate using a dichroic dye when the dichroic dye is iodine.
- Patent Document 6 discloses a method of treating with a weakly alkaline solution having a pH of 7.5 to 9.5. This is a method in which the dichroic dye is iodine and the film to be laminated is adhered.
- a process of suppressing reddening phenomenon under high-temperature heating conditions of a polarizing plate formed by an active energy ray-curable adhesive containing a curable component at the time, and thus polyeneization of a polyvinyl alcohol resin film As described in [0028] of the same document, it is a process for suppressing a decrease in pH when active energy irradiation is performed.
- the pH of the polarizing element after active energy irradiation is normal The purpose is to keep the state unchanged from the state of the polarizing element, and the pH of the polarizing element itself is not substantially controllable.
- the technology for improving the durability of the polarizing element It was not disclosed.
- JP 2001-083329 A JP-A-6-254958 JP-A-2005-62458 JP 2006-276236 A JP2009-230131A JP2009-282137
- the present invention relates to a dye-based polarizing plate in which a dichroic dye is adsorbed on a polyvinyl alcohol resin film, and not only enables easy wavelength adjustment but also excellent polarization performance and excellent durability such as light resistance. It is to provide a high-performance polarizing element or polarizing plate having a property and a method for producing the same. A further object is to provide a high-performance polarizing plate corresponding to the three primary colors of a color liquid crystal projector and having good brightness, polarization performance, durability and light resistance.
- the present invention relates to “(1) a polarizing element comprising a polyvinyl alcohol resin film formed by adsorbing and stretching a dichroic dye, and 0.65 parts by weight of the polarizing element is heated with hot water (90 to 100).
- a polarizing element wherein the aqueous solution exhibits a pH of 5.9 to 9.0 when it is dissolved in 100 parts by weight and then cooled to 25 ° C.
- azo compound is a dichroic dye represented by the formula (1) or a salt thereof as a free acid.
- A represents a phenyl group or naphthyl group having a substituent
- R 1 to R 6 are each independently a lower alkoxy group having a hydrogen atom, a lower alkyl group, a lower alkoxy group, a sulfo group, or a sulfo group.
- X represents an amino group which may have a substituent, a benzoylamino group which may have a substituent, a phenylamino group which may have a substituent, a phenylazo group which may have a substituent M and n each independently represents 0 or 1.
- X is represented by Formula (2).
- R 7 and R 8 each independently represent a hydrogen atom, a methyl group, a methoxy group, a sulfo group, an amino group or a substituted amino group.
- A is a phenyl group having a carbonyl group.
- a polarizing plate comprising a support film provided on at least one surface of the polarizing element according to any one of (1) to (7).
- a polarizing plate with an inorganic substrate wherein the polarizing element according to (1) or the polarizing plate according to (8) is laminated on an inorganic substrate.
- the polarizing element of the present invention and a polarizing plate using the same can easily adjust the wavelength, and can improve durability while having a high degree of polarization.
- the polyvinyl alcohol resin film that can achieve the present invention will be described.
- the manufacturing method of the polyvinyl alcohol resin film which comprises a polarizing element is not specifically limited, It can manufacture by a well-known method.
- As a manufacturing method of a polyvinyl alcohol resin film it can obtain by saponifying a polyvinyl acetate type resin, for example.
- Examples of the polyvinyl acetate-based resin include polyvinyl acetate, which is a homopolymer of vinyl acetate, and copolymers of vinyl acetate and other monomers copolymerizable therewith.
- Examples of other monomers copolymerized with vinyl acetate include unsaturated carboxylic acids, olefins, vinyl ethers, and unsaturated sulfonic acids.
- the saponification degree of the polyvinyl alcohol resin is usually preferably from 85 to 100 mol%, more preferably 95 mol% or more.
- This polyvinyl alcohol resin may be further modified, for example, polyvinyl formal or polyvinyl acetal modified with aldehydes may be used.
- the degree of polymerization of the polyvinyl alcohol resin is usually preferably from 1,000 to 10,000, and more preferably from 1,500 to 5,000.
- a film formed from such a polyvinyl alcohol resin is used as a raw film.
- the method for forming the polyvinyl alcohol resin film is not particularly limited, and can be formed by a known method.
- the polyvinyl alcohol resin can contain glycerin, ethylene glycol, propylene glycol, low molecular weight polyethylene glycol or the like as a plasticizer.
- the amount of plasticizer is preferably 5 to 20% by weight, more preferably 8 to 15% by weight.
- the thickness of the raw film made of polyvinyl alcohol resin is not particularly limited, but is preferably 5 to 150 ⁇ m, and more preferably 10 to 100 ⁇ m.
- the polyvinyl alcohol resin film is first subjected to a swelling process.
- the swelling step is performed by immersing the polyvinyl alcohol resin film in a solution at 20 to 50 ° C. for 30 seconds to 10 minutes.
- the solution is preferably water.
- the dyeing process is performed after the swelling process.
- the dichroic dye represented by Formula (1) can be made to adsorb
- the dyeing process is not particularly limited as long as the dye is adsorbed on the polyvinyl alcohol resin film.
- the dyeing process is performed by immersing the polyvinyl alcohol resin film in a solution containing a dichroic dye.
- the solution temperature in this step is preferably 5 to 60 ° C, more preferably 20 to 50 ° C, and particularly preferably 35 to 50 ° C.
- the time for dipping in the solution can be adjusted moderately, but is preferably adjusted from 30 seconds to 20 minutes, more preferably from 1 to 10 minutes.
- the dyeing method is preferably immersed in the solution, but can also be performed by applying the solution to a polyvinyl alcohol resin film.
- the solution containing the dichroic dye can contain sodium chloride, sodium sulfate, anhydrous sodium sulfate, sodium tripolyphosphate and the like as a dyeing assistant.
- Their content can be adjusted at any concentration depending on the time and temperature depending on the dyeability of the dye, but the respective content is preferably 0 to 5% by weight, more preferably 0.1 to 2% by weight.
- Non-Patent Document 1 a compound as shown in Non-Patent Document 1, in particular, an azo compound can be preferably used.
- those having high dichroism are preferable.
- Examples of such a high dichroic dye include C.I. Ai. direct. Yellow 12, sea. Ai. direct. Yellow 28, Sea. Ai. direct. Yellow 44, Sea. Ai. direct. Orange 26, Sea. Ai. direct. Orange 39, sea. Ai. Moldant. Yellow 26, Sea. Ai. direct. Orange 107, sea. Ai. direct. Red 2, sea. Ai. direct. Red 31, sea. Ai. direct. Red 79, Sea. Ai. direct. Red 81, Sea. Ai. direct. Red 247, Sea. Ai. direct. Green 80, Sea.
- the azo dye is not limited to these, and a known dichroic dye can be used.
- the azo dichroic dye is preferably a dichroic dye represented by the formula (1) or a salt thereof as a free acid, and as such a dye, Japanese Patent Laid-Open No. 63-189803.
- the dyes described in Japanese Patent Publication No. 4825135, International Publication No. WO2007 / 148757, International Publication No. WO2009 / 154055, Japanese Patent Application No. 2011-023747, and Japanese Patent Application No. 2011-023748 are more preferable dyes.
- other organic dyes can be used in combination as required.
- the blending ratio is not particularly limited, and the blending amount can be arbitrarily set according to demands such as a light source and a hue.
- A represents a phenyl group or naphthyl group having a substituent
- R 1 to R 6 are each independently a lower alkoxy group having a hydrogen atom, a lower alkyl group, a lower alkoxy group, a sulfo group, or a sulfo group.
- X represents an amino group which may have a substituent, a benzoylamino group which may have a substituent, a phenylamino group which may have a substituent, a phenylazo group which may have a substituent M and n each independently represents 0 or 1.
- Particularly preferred dyes are exemplified by Formula (2) and Formula (3) of Japanese Patent Publication No. 4825135, Example 1 of Japanese Patent Application No. 2011-023747, Formula (2) to Formula (18) of International Publication No. WO2007 / 148757, and the like.
- X in the formula (1) of the present application is represented by the formula (3), particularly when R 9 in the formula (3) is a hydrogen atom, a methyl group or a methoxy group. preferable.
- Other preferable dyes are dyes exemplified in Formula (6) of Japanese Patent Publication No. 4825135, Formula (24) and Formula (25) of International Publication No. WO2009 / 154055, and the like in Formula (1) of the present application.
- X is represented by the formula (4).
- Other preferred dyes are the dyes exemplified in WO 2007/138980, compound examples (1) to (6), and JP-A 63-189803, examples (1) to (19). Particularly preferred are dyes wherein is a phenyl group having a carbonyl group, A is a phenyl group having a hydroxyl group, or A is both a carbonyl group and a hydroxyl group.
- R 9 represents a hydrogen atom, a methyl group, a methoxy group, a sulfo group, an amino group or a substituted amino group.
- R 10 and R 11 each independently represent a sulfo group or an amino group.
- organic dyes can be used in combination as required.
- the types of organic dyes to be blended differ.
- the blending ratio is not particularly limited, and the blending amount can be arbitrarily set according to demands such as a light source and a hue.
- the dichroic dye can be present in the form of the free acid or in the form of its salt.
- the salt include alkali metal salts, alkaline earth metal salts, alkylamine salts, alkanolamine salts, and ammonium salts.
- dyeing staining to the base material for polarizing films, it is preferable that it is a salt of sodium, potassium, or ammonium.
- the salt of the salified compound can be isolated in the form of a free acid by addition of a mineral acid after the coupling reaction, and the inorganic salt can be removed therefrom by washing with water or acidified water.
- the acid type dye having a low salt content thus obtained can then be neutralized with a desired inorganic or organic base in an aqueous medium to form a corresponding salt solution.
- a sodium chloride can be used to form a sodium salt
- potassium chloride can be used to form a potassium salt, and thus a desired salt can be obtained. it can.
- it can also process with copper sulfate etc. to make a copper complex salt compound.
- the washing step 1 is a step of washing the dye solvent adhering to the surface of the polyvinyl alcohol resin film in the dyeing step. By performing the washing step 1, it is possible to suppress the migration of the dye into the liquid to be processed next.
- water is generally used.
- the washing method is preferably immersed in the solution, but can also be washed by applying the solution to a polyvinyl alcohol resin film.
- the washing time is not particularly limited, but is preferably 1 to 300 seconds, more preferably 1 to 60 seconds.
- the temperature of the solvent in the washing step 1 needs to be a temperature at which the hydrophilic polymer does not dissolve. Generally, it is washed at 5 to 40 ° C.
- a step of adding a crosslinking agent and / or a water resistance agent can be performed.
- the crosslinking agent include boron compounds such as boric acid, borax or ammonium borate, polyvalent aldehydes such as glyoxal or glutaraldehyde, polyisocyanate compounds such as biuret type, isocyanurate type or block type, titanium oxy Titanium compounds such as sulfate can be used, but ethylene glycol glycidyl ether, polyamide epichlorohydrin, and the like can also be used.
- water-resistant agent examples include succinic peroxide, ammonium persulfate, calcium perchlorate, benzoin ethyl ether, ethylene glycol diglycidyl ether, glycerin diglycidyl ether, ammonium chloride or magnesium chloride, preferably boric acid.
- succinic peroxide ammonium persulfate
- calcium perchlorate benzoin ethyl ether
- ethylene glycol diglycidyl ether glycerin diglycidyl ether
- ammonium chloride or magnesium chloride preferably boric acid.
- the step of containing a crosslinking agent and / or a water-resistant agent is performed using at least one kind of crosslinking agent and / or a water-resistant agent shown above.
- water is preferable, but it is not limited.
- the concentration of the cross-linking agent and / or the water-proofing agent in the solvent in the step of adding the cross-linking agent and / or the water-proofing agent is 0.1 to 6.0 when boric acid is used as an example. % By weight is preferable, and 1.0 to 4.0% by weight is more preferable.
- the solvent temperature in this step is preferably 5 to 70 ° C, more preferably 5 to 50 ° C. Although it is preferable to immerse the polyvinyl alcohol resin film in a solution containing a crosslinking agent and / or a waterproofing agent, the solution may be applied to or coated on the polyvinyl alcohol resin film.
- the treatment time in this step is preferably 30 seconds to 6 minutes, more preferably 1 to 5 minutes. However, it is not essential to contain a crosslinking agent and / or a water-resistant agent, and this treatment step may be omitted when it is desired to shorten the time or when the crosslinking treatment or the water-resistant treatment is unnecessary.
- the stretching step is a step of stretching the polyvinyl alcohol resin film uniaxially.
- the stretching method may be either a wet stretching method or a dry stretching method.
- the temperature of the air medium is preferably stretched at a room temperature to 180 ° C.
- the treatment is preferably performed in an atmosphere of 20 to 95% RH.
- the heating method include an inter-roll zone stretching method, a roll heating stretching method, a pressure stretching method, an infrared heating stretching method, and the like, but the stretching method is not limited.
- the stretching step can be performed in one step, but can also be performed by two or more multi-step stretching.
- stretching is performed in water, a water-soluble organic solvent, or a mixed solution thereof. It is preferable to perform the stretching treatment while being immersed in a solution containing a crosslinking agent and / or a water resistance agent.
- a crosslinking agent include boron compounds such as boric acid, borax or ammonium borate, polyvalent aldehydes such as glyoxal or glutaraldehyde, polyisocyanate compounds such as biuret type, isocyanurate type or block type, titanium oxy Titanium compounds such as sulfate can be used, but ethylene glycol glycidyl ether, polyamide epichlorohydrin, and the like can also be used.
- water-proofing agents examples include succinic peroxide, ammonium persulfate, calcium perchlorate, benzoin ethyl ether, ethylene glycol diglycidyl ether, glycerin diglycidyl ether, ammonium chloride, and magnesium chloride.
- Stretching is performed in a solution containing at least one or more crosslinking agents and / or waterproofing agents as described above.
- the crosslinking agent is preferably boric acid.
- the concentration of the crosslinking agent and / or waterproofing agent in the stretching step is preferably, for example, 0.5 to 15% by weight, more preferably 2.0 to 8.0% by weight.
- the draw ratio is preferably 2 to 8 times, more preferably 5 to 7 times.
- the stretching temperature is preferably 40 to 60 ° C, more preferably 45 to 58 ° C.
- the stretching time is usually from 30 seconds to 20 minutes, more preferably from 2 to 5 minutes.
- the wet stretching step can be performed in one step, but can also be performed by two or more steps.
- the film surface may be subjected to a cleaning process (hereinafter referred to as a cleaning process 2) because the cross-linking agent and / or waterproofing agent may be deposited or foreign matter may adhere to the film surface.
- the washing time is preferably 1 second to 5 minutes, more preferably 5 seconds to 60 seconds, and more preferably 10 seconds to 30 seconds.
- the washing method is preferably immersed in a washing solution, but the solution can be washed on the polyvinyl alcohol resin film by coating or coating.
- the cleaning process can be performed in one stage, and the multi-stage process of two or more stages can be performed.
- the solution temperature in the washing step is not particularly limited, but is usually 5 to 50 ° C., preferably 10 to 40 ° C.
- the pH of the aqueous solution when the polarizing element is dissolved is 5.9 or more. Is needed. Preferably, it is 5.9 or more, 9.0, more preferably 5.9 to 8.5, and even more preferably 6.0 to 7.0.
- the pH of the aqueous solution when the polarizing element is dissolved is that 0.65 parts by weight of the polarizing element is immersed in pure water at 90 ° C. to 100 ° C. for 30 to 60 minutes with stirring, and the polarizing element is dissolved. If the polarizing element does not dissolve, the pH of the aqueous solution when the aqueous solution that is highly overswelled is 25 ° C. is shown. The pH can be measured using a commercially available pH meter.
- Such a polarizing element can be obtained by treating a polyvinyl alcohol resin film containing a dichroic dye with a basic aqueous solution in a dyeing step or a washing step after washing treatment (washing step 2).
- the pH of the basic aqueous solution during the treatment is preferably 7.5 to 12, more preferably 7.5 to 11.5, and still more preferably 8.0 to 10.5.
- the pH to be processed is lower than 7.5, the durability is not improved, or deterioration may be accelerated depending on the durability test, which is not preferable.
- the basic substance for adjusting the pH to 7.5 to 12 is not particularly limited, and any substance can be used as long as it can exhibit basicity in an aqueous solution or in a solution state.
- the basic substances may be used one by one, or two or more kinds may be mixed and used. Examples of such basic substances include, but are not limited to, sodium acetate, sodium carbonate, sodium bicarbonate, ammonia, sodium hydroxide, lithium hydroxide, potassium hydroxide, and sodium tripolyphosphate. Any material that can be adjusted to basicity can be used.
- the solvent used in the treatment steps so far, for example, water, dimethyl sulfoxide, N-methylpyrrolidone, methanol, ethanol, propanol, isopropyl alcohol, glycerin, ethylene glycol, propylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol or triethylene glycol
- the solvent include, but are not limited to, alcohols such as methylolpropane, and amines such as ethylenediamine or diethylenetriamine. A mixture of one or more of these solvents can also be used.
- the most preferred solvent is water.
- a film drying process is performed.
- the drying process can be performed by natural drying, but in order to further improve the drying efficiency, the surface can be removed by compression with a roll, an air knife, a water absorption roll, etc., and / or blow drying is performed. You can also.
- the drying treatment temperature is preferably 20 to 100 ° C., more preferably 50 to 90 ° C.
- a drying treatment time of 30 seconds to 20 minutes can be applied, but 5 to 10 minutes is preferable.
- the boric acid content of the polarizing element of the present invention is preferably in the range of 5 to 28% by weight with respect to the weight of the polarizing element.
- the range is preferably 12 to 24% by weight, and more preferably 15 to 22% by weight.
- the boric acid content is less than 5%, the polarization property is lowered and the durability is also lowered.
- the boric acid concentration is higher than 28% by weight, it is not preferable because the treatment may be insufficient, boric acid may precipitate, or treatment unevenness may occur when immersed in a basic aqueous solution. .
- the calculation formula for obtaining the boric acid content is obtained by the formula (i).
- F represents the factor of the aqueous sodium hydroxide solution.
- the polarizing element comprising the polyvinyl alcohol resin film formed by adsorbing and stretching the dichroic dye by the above method
- 0.65 parts by weight of the polarizing element is added to 100 parts by weight of hot water (90 to 100 ° C.).
- the polarizing element is characterized in that when cooled to 25 ° C., the pH of the aqueous solution is 5.9 to 9.0.
- the obtained polarizing element is made into a polarizing plate by providing a transparent protective layer on one side or both sides thereof.
- the transparent protective layer can be provided as a polymer coating layer or as a film laminate layer.
- the transparent polymer or film forming the transparent protective layer is preferably a transparent polymer or film having high mechanical strength and good thermal stability.
- substances used as the transparent protective layer include cellulose acetate resins such as triacetyl cellulose and diacetyl cellulose or films thereof, acrylic resins or films thereof, polyvinyl chloride resins or films thereof, polyester resins or films thereof, polyarylate resins or The film, a cyclic polyolefin resin having a cyclic olefin such as norbornene or the film thereof, polyethylene, polypropylene, a polyolefin having a cyclo or norbornene skeleton or a copolymer thereof, and the main chain or side chain of which is imide and / or amide
- cellulose acetate resins such as triacetyl cellulose and diacetyl cellulose or films thereof, acrylic resins or films thereof, polyvinyl chloride resins or films thereof, polyester resins or films thereof, polyarylate resins or The film, a cyclic polyolefin resin having a cyclic olefin such as norbornene or
- a resin having liquid crystallinity or a film thereof can be provided as the transparent protective layer.
- the thickness of the protective film is, for example, about 0.5 to 200 ⁇ m.
- a polarizing plate is produced by providing one or more layers of the same or different types of resins or films on one side or both sides.
- An adhesive is required to bond the transparent protective layer to the polarizing element.
- a polyvinyl alcohol-type adhesive agent is preferable.
- the polyvinyl alcohol-based adhesive include, but are not limited to, Gohsenol NH-26 (manufactured by Nihon Gosei Co., Ltd.), EXEVAL RS-2117 (manufactured by Kuraray Co., Ltd.), and the like.
- a cross-linking agent and / or a waterproofing agent can be added to the adhesive.
- a maleic anhydride-isobutylene copolymer is used, but if necessary, an adhesive mixed with a crosslinking agent can be used.
- maleic anhydride-isobutylene copolymers for example, isoban # 18 (manufactured by Kuraray), isoban # 04 (manufactured by Kuraray), ammonia-modified isoban # 104 (manufactured by Kuraray), ammonia-modified isoban # 110 (manufactured by Kuraray) ), Imidized isoban # 304 (manufactured by Kuraray), imidized isoban # 310 (manufactured by Kuraray), and the like.
- a water-soluble polyvalent epoxy compound can be used as the crosslinking agent at that time.
- water-soluble polyvalent epoxy compound examples include Denacol EX-521 (manufactured by Nagase Chemtech) and Tetrat-C (manufactured by Mitsui Gas Chemical Co., Ltd.).
- adhesives other than polyvinyl alcohol-type resin well-known adhesives, such as urethane type, an acrylic type, and an epoxy type, can also be used.
- additives such as zinc compounds, chlorides, iodides and the like can be simultaneously contained at a concentration of about 0.1 to 10% by weight. The additive is not limited. After laminating the transparent protective layer with an adhesive, the polarizing plate is obtained by drying or heat treatment at a suitable temperature.
- the obtained polarizing plate is bonded to a display device such as liquid crystal or organic electroluminescence, various functional layers and luminance for improving the viewing angle and / or contrast on the surface of the protective layer or film that will be the non-exposed surface later.
- a display device such as liquid crystal or organic electroluminescence
- various functional layers and luminance for improving the viewing angle and / or contrast on the surface of the protective layer or film that will be the non-exposed surface later.
- An improving layer or film can also be provided.
- the polarizing plate may have various known functional layers such as an antireflection layer, an antiglare layer, and a hard coat layer on the other surface, that is, the exposed surface of the protective layer or film.
- a coating method is preferable for producing the layer having various functions, but a film having the function can be bonded through an adhesive or a pressure-sensitive adhesive.
- the various functional layers can be a layer or a film for controlling the phase difference.
- the polarizing plate for a liquid crystal projector which is one form of use of the polarizing plate of the present invention, is usually used as a polarizing plate with a support.
- the support preferably has a flat portion, and since it is used for optical purposes, a glass molded product is preferable.
- the glass molded product include a glass plate, a lens, and a prism (for example, a triangular prism and a cubic prism).
- a lens attached with a polarizing plate can be used as a condenser lens with a polarizing plate in a liquid crystal projector.
- a prism with a polarizing plate attached thereto can be used as a polarizing beam splitter with a polarizing plate or a dichroic prism with a polarizing plate in a liquid crystal projector.
- the material of the glass include inorganic glass such as soda glass, borosilicate glass, inorganic substrate made of crystal, inorganic substrate made of sapphire, and organic plastic plate such as acrylic and polycarbonate, but inorganic glass. Is preferred.
- the glass plate may have a desired thickness and size. In order to further improve the single plate light transmittance, it is preferable to provide an AR layer on one or both of the glass surface and the polarizing plate surface of the polarizing plate with glass.
- a polarizing plate with a support for a liquid crystal projector is produced by a method known per se.
- a transparent adhesive (adhesive) agent is applied to a flat surface of a support, and then the polarizing plate of the present invention is applied to the coated surface.
- a transparent adhesive (adhesive) agent may be applied to the polarizing plate, and then a support may be attached to the coated surface.
- the adhesive (adhesive) agent used here is preferably, for example, an acrylic ester-based one.
- the polarizing element comprising the polyvinyl alcohol resin film formed by adsorbing and stretching the dichroic dye by the above method
- 0.65 parts by weight of the polarizing element is added to 100 parts by weight of hot water (90 to 100 ° C.).
- a polarizing plate characterized in that the pH of the aqueous solution exhibits 5.9 to 9.0 can be produced.
- the polarizing plate thus obtained and its production method are effective as a production method capable of easily adjusting the wavelength and having high durability while having a high degree of polarization.
- a polarizing plate having high contrast, durability against light and / or heat, high-temperature and high-humidity conditions, in particular, little deterioration of polarization characteristics, and little color change with respect to an image display device using a liquid crystal cell. Can provide.
- a display using the polarizing element or polarizing plate of the present invention is highly reliable, has a long-term high contrast, and has a high color reproducibility.
- the liquid crystal projector When the polarizing plate of the present invention thus obtained is used for, for example, a liquid crystal projector, the liquid crystal projector has improved luminance, high contrast, and high durability.
- the present invention is very effective for improving the high polarization characteristics, durability, and color reproducibility.
- the transmittance after the visibility correction based on JIS-Z8701 (C light source 2 ° field of view) is provided on the light exit side.
- An iodine polarizing plate (SKN-18043P manufactured by Polatechno Co., Ltd.) having a polarization degree of 99.99% at 43% was installed so that absolute polarized light could be incident on the measurement sample.
- the protective layer of the iodine-based polarizing plate is triacetyl cellulose having no ultraviolet absorbing ability.
- PH was measured with pH Meter (D-51) manufactured by HORIBA.
- Example 1 A 75 ⁇ m thick polyvinyl alcohol resin film (VF series manufactured by Kuraray Co., Ltd.) having a saponification degree of 99% or more was immersed in warm water at 40 ° C. for 3 minutes for swelling treatment. 45.
- the film subjected to swelling treatment contained 0.02% by weight of the trisazo dye of the formula (2) shown in Example 1 of Japanese Patent No. 4825135, 0.1% by weight of sodium tripolyphosphate, and 45% by weight of sodium sulfate.
- the dye was adsorbed by dipping in an aqueous solution at 0 ° C.
- the film on which the dye was adsorbed was washed with water. After washing, the film was treated with boric acid for 1 minute with a 40 ° C.
- aqueous solution containing 2% by weight of boric acid aqueous solution containing 2% by weight of boric acid.
- the film obtained by the boric acid treatment was treated for 5 minutes in an aqueous solution at 55 ° C. containing 3.0% by weight of boric acid while stretching 5.0 times. While maintaining the tension of the film obtained by the boric acid treatment, the film was treated with an aqueous solution containing 0.8% by weight of sodium acetate and having a pH of 8.01 for 15 seconds.
- the film obtained by the treatment was immediately dried at 60 ° C. for 5 minutes to obtain a polarizing element having a thickness of 28 ⁇ m.
- the polarizing element After 0.65 parts by weight of the polarizing element was dissolved in 100 parts by weight of hot water (90-100 ° C.), the aqueous solution had a pH of 6.30 and a boric acid concentration of 16.4 wt. %Met.
- the obtained polarizing element was alkali-treated with a triacetyl cellulose film having a film thickness of 80 ⁇ m (TD-80U manufactured by Fuji Photo Film Co., Ltd., hereinafter abbreviated as TAC) and a polyvinyl alcohol-based adhesive, and polarizing element / adhesive layer / A TAC structure was laminated and laminated to obtain a polarizing plate, which was used as a measurement sample.
- Example 2 A polarizing element and a polarizing plate were obtained in the same manner except that the concentration of sodium acetate used in Example 1 was changed to 2.4% by weight and the pH of the aqueous solution was changed to 8.26. did. After 0.65 parts by weight of the polarizing element is dissolved in 100 parts by weight of hot water (90-100 ° C.), the aqueous solution has a pH of 6.59 and a boric acid concentration of 17.2 wt. %Met.
- Example 3 A polarizing element and a polarizing plate were obtained in the same manner except that the dye used in Example 2 was changed to the dye shown in Example 7 of International Publication No. WO2007 / 148757, and used as a measurement sample. After 0.65 parts by weight of the polarizing element is dissolved in 100 parts by weight of hot water (90-100 ° C.), the aqueous solution has a pH of 6.66 and a boric acid concentration of 16.8 wt. %Met.
- Example 4 A polarizing element and a polarizing plate were obtained in the same manner except that the dye used in Example 2 was changed to the dye shown in Example 1 of Patent Application No. 2011-023747, and used as a measurement sample. After 0.65 parts by weight of the polarizing element is dissolved in 100 parts by weight of hot water (90-100 ° C.), the aqueous solution has a pH of 6.56 and a boric acid concentration of 16.5% when cooled to 25 ° C. %Met.
- Example 5 In Example 3, a polarizing element and a polarizing plate were obtained in the same manner except that sodium acetate was changed to sodium carbonate and the pH of the aqueous solution to be treated was changed to 8.2. After 0.65 parts by weight of the polarizing element was dissolved in 100 parts by weight of hot water (90-100 ° C.), the aqueous solution had a pH of 6.74 and a boric acid concentration of 15.7 wt. %Met.
- Example 6 In Example 3, a polarizing element and a polarizing plate were obtained in the same manner except that sodium acetate was changed to ammonia and the pH of the aqueous solution to be treated was changed to 8.2, and used as a measurement sample. After dissolving 0.65 parts by weight of the polarizing element in 100 parts by weight of hot water (90-100 ° C.), the pH of the aqueous solution when cooled to 25 ° C. is 6.38, and the boric acid concentration is 16.1% by weight. %Met.
- Example 7 In Example 3, a polarizing element and a polarizing plate were obtained in the same manner except that sodium acetate was changed to sodium hydroxide and the pH of the aqueous solution to be treated was changed to 8.2. After 0.65 parts by weight of the polarizing element was dissolved in 100 parts by weight of hot water (90-100 ° C.), the aqueous solution had a pH of 6.77 and a boric acid concentration of 16.7 wt. %Met.
- Example 8 The dye used in Example 1 is changed to the dye described in Example 16 of Japanese Patent Publication No. 63-189803, and sodium acetate contained in the aqueous solution to be treated after stretching is changed to sodium carbonate.
- a polarizing element and a polarizing plate were obtained in the same manner except that the pH was changed to 10.5, and used as a measurement sample. After 0.65 parts by weight of the polarizing element was dissolved in 100 parts by weight of hot water (90-100 ° C.), the aqueous solution had a pH of 7.24 and a boric acid concentration of 17.7 wt. %Met.
- Example 9 The dye used in Example 1 was changed to the dye shown in Example 1 of International Publication No. WO2009 / 154055, and sodium acetate contained in the aqueous solution to be treated after stretching was changed to sodium carbonate, and the pH of the aqueous solution was adjusted.
- a polarizing element and a polarizing plate were obtained in the same manner except for changing to 10.5, and used as a measurement sample. After dissolving 0.65 parts by weight of the polarizing element in 100 parts by weight of hot water (90 to 100 ° C.), the pH of the aqueous solution when cooled to 25 ° C. is 7.43, and the boric acid concentration is 17.1 wt. %Met.
- Example 10 In Example 7, a polarizing element and a polarizing plate were obtained in the same manner except that the pH of the aqueous solution to be treated was changed to 11.2, and used as a measurement sample. After 0.65 parts by weight of the polarizing element was dissolved in 100 parts by weight of hot water (90-100 ° C.), the aqueous solution had a pH of 8.08 and a boric acid concentration of 16.3 wt. %Met.
- Example 8 a polarizing element and a polarizing plate were obtained in the same manner except that sodium carbonate contained in the aqueous solution to be treated after stretching was changed to oxalic acid and the pH of the aqueous solution was changed to 3.0. A measurement sample was obtained. After 0.65 parts by weight of the polarizing element was dissolved in 100 parts by weight of hot water (90-100 ° C.), the aqueous solution had a pH of 4.77 and a boric acid concentration of 16.7% when cooled to 25 ° C. %Met.
- Example 9 a polarizing element and a polarizing plate were obtained in the same manner except that sodium carbonate contained in the aqueous solution to be treated after stretching was oxalic acid and the pH of the aqueous solution was changed to 3.0. A measurement sample was obtained. After dissolving 0.65 parts by weight of the polarizing element in 100 parts by weight of hot water (90 to 100 ° C.), the pH of the aqueous solution when cooled to 25 ° C. is 4.91, and the boric acid concentration is 18.1 wt. %Met.
- Comparative Example 8 An iodine polarizing plate (SKN-18243P manufactured by Poracteno Co., Ltd.) was immersed in dichloromethane to dissolve TAC to obtain a polarizing element containing an iodine dichroic dye. The obtained polarizing element was treated for 15 seconds with an aqueous solution containing 0.8% by weight of sodium acetate used in Example 1 and having a pH of 8.01. The film obtained by the treatment was immediately dried at 60 ° C. for 5 minutes to obtain a polarizing element having a thickness of 29 ⁇ m.
- the aqueous solution had a pH of 5.52 and a boric acid concentration of 16.5 wt. %Met.
- TAC 80 ⁇ m-thick triacetyl cellulose film
- polyvinyl alcohol-based adhesive which are alkali-treated with the polarizing element.
- the polarizing element was treated at pH 7.5 to 12 and dissolved in hot water (90 to 100 ° C.), and then cooled to 25 ° C.
- the polarizing plates of Examples 1 to 10 using the polarizing element of the present invention in which the pH of the aqueous solution at that time is 5.9 to 9.0 show little decrease in the degree of polarization after light irradiation, and further, there is no color change. From this, it can be seen that the light resistance is improved.
- the polarizing plates of Comparative Examples 1 to 7 have a large decrease in the degree of polarization after light irradiation, are also yellowed with respect to color change, and are significantly inferior in light resistance. Further, in the polarizing plate having a different treatment process from that of the present application and treated only with pH 8.01, like the iodine polarizing plate of Comparative Example 8, the Ky and the degree of polarization are greatly reduced, and the color change is greatly reduced. It turns out that it is remarkably inferior in terms of light resistance. From these facts, it is understood that a polarizing plate having high durability and little discoloration can be obtained by using the polarizing plate using the polarizing element of the present invention.
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Abstract
Description
(2)二色性染料がアゾ系化合物であることを特徴とする(1)に記載の偏光素子。
(3)ホウ酸含有量が、5乃至28重量%であることを特徴とする(1)または(2)に記載の偏光素子。
(4)アゾ系化合物が、遊離酸として、式(1)で表される二色性染料、もしくはその塩であることを特徴とする(2)又は(3)に記載の偏光素子。
(式中、Aは置換基を有するフェニル基またはナフチル基を示し、R1乃至R6は各々独立に、水素原子、低級アルキル基、低級アルコキシ基、スルホ基、又はスルホ基を有する低級アルコキシ基を示し、Xは置換基を有してもよいアミノ基、置換基を有してもよいベンゾイルアミノ基、置換基を有してもよいフェニルアミノ基、置換基を有してもよいフェニルアゾ基を示し、m、nはそれぞれ独立に0または1を示す。)
(5)Xが式(2)で表されることを特徴とする(4)に記載の偏光素子。
(式中、R7及びR8は各々独立に水素原子、メチル基、メトキシ基、スルホ基、アミノ基又は置換アミノ基を示す。)
(6)Aがカルボニル基を有するフェニル基であることを特徴とする(4)又は(5)に記載の偏光素子。
(7)Aがヒドロキシル基を有するフェニル基であることを特徴とする(4)又は(5)に記載の偏光素子。
(8)(1)乃至(7)のいずれか1項に記載の偏光素子の少なくとも片面に支持体フィルムを設けてなる偏光板。
(9)無機基板に(1)に記載の偏光素子または(8)に記載の偏光板が積層されたことを特徴とする無機基板付偏光板。
(10)液晶プロジェクターに用いられる(1)乃至(7)のいずれか1項に記載の偏光素子または(8)~(9)のいずれかに記載の偏光板。
(11)(1)乃至(7)、(10)のいずれか1項に記載の偏光素子が搭載されたプロジェクター。
(12)(8)乃至(10)のいずれか1項に記載の偏光板が搭載されたプロジェクター。
(13)アゾ系化合物である二色性染料が吸着されて延伸されてなるポリビニルアルコール樹脂フィルムよりなる偏光素子の製造方法であって、pHが7.5乃至12である水溶液で処理されてなる該製造方法。
(14)アゾ系化合物である二色性染料が吸着されて延伸されてなるポリビニルアルコール樹脂フィルムよりなる偏光素子の製造方法であって、延伸処理を行なった後、pHが7.5乃至12である水溶液へ浸漬させ、直ちに乾燥処理を行うことを特徴とする該製造方法。」に、関する。
本発明を達成しうるポリビニルアルコール樹脂フィルムについて説明する。偏光素子を構成するポリビニルアルコール樹脂フィルムの製造方法は、特に限定されるものではなく、公知の方法で製造することができる。ポリビニルアルコール樹脂フィルムの製造方法としては、例えば、ポリ酢酸ビニル系樹脂をケン化することにより得ることができる。ポリ酢酸ビニル系樹脂としては、酢酸ビニルの単独重合体であるポリ酢酸ビニルのほか、酢酸ビニル及びこれと共重合可能な他の単量体の共重合体などが挙げられる。酢酸ビニルと共重合する他の単量体としては、例えば、不飽和カルボン酸類、オレフィン類、ビニルエーテル類又は不飽和スルホン酸類などが挙げられる。ポリビニルアルコール樹脂のケン化度は、通常85~100モル%が好ましく、95モル%以上がより好ましい。このポリビニルアルコール樹脂は、さらに変性されていてもよく、例えば、アルデヒド類で変性したポリビニルホルマールやポリビニルアセタールなども使用できる。またポリビニルアルコール樹脂の重合度は、通常1,000~10,000が好ましく、1,500~5,000がより好ましい。
(式中、Aは置換基を有するフェニル基またはナフチル基を示し、R1乃至R6は各々独立に、水素原子、低級アルキル基、低級アルコキシ基、スルホ基、又はスルホ基を有する低級アルコキシ基を示し、Xは置換基を有してもよいアミノ基、置換基を有してもよいベンゾイルアミノ基、置換基を有してもよいフェニルアミノ基、置換基を有してもよいフェニルアゾ基を示し、m, nはそれぞれ独立に0または1を示す。)
この時のBは水だけで水酸化ナトリウムを滴下した時、pH=8.4になる滴下量(ml)を示す。
Fは水酸化ナトリウム水溶液のファクターを示す。
ケン化度が99%以上の膜厚75μmのポリビニルアルコール樹脂フィルム(クラレ社製 VFシリーズ)を40℃の温水に3分浸漬し膨潤処理をした。膨潤処理したフィルムを、特許第4825135号の実施例1で示される式(2)のトリスアゾ染料を0.02重量%、トリポリ燐酸ナトリウム0.1重量%、芒硝0.1重量%を含有した45℃の水溶液に浸漬し、染料の吸着を行った。染料が吸着されたフィルムを水にて洗浄し、洗浄の後、2重量%のホウ酸を含有した40℃の水溶液で1分間ホウ酸処理を行った。ホウ酸処理して得られたフィルムを、5.0倍に延伸しながらホウ酸3.0重量%を含有した55℃の水溶液中で5分間処理を行った。そのホウ酸処理して得られたフィルムの緊張状態を保ちつつ、酢酸ナトリウム 0.8重量%を含有したpHが8.01である水溶液で15秒間処理を行った。処理して得られたフィルムを直ちに60℃で5分間乾燥処理を行い膜厚28μmの偏光素子を得た。0.65重量部の偏光素子を熱水(90~100℃)100重量部に対して溶解した後、25℃に冷却した時の水溶液のpHは6.30、ホウ酸濃度は16.4重量%であった。得られた偏光素子を、アルカリ処理した膜厚80μmのトリアセチルセルロースフィルム(富士写真フィルム社製 TD-80U、以下TACと省略)と、ポリビニルアルコール系接着剤を用いて、偏光素子/接着層/TACという構成で積層し、ラミネートして偏光板を得て測定試料とした。
実施例1で用いられた酢酸ナトリウムの濃度を2.4重量%に変えて、水溶液のpHを8.26に変えた以外は同様にして偏光素子、ならびに、偏光板を得て、測定試料とした。0.65重量部の偏光素子を熱水(90~100℃)100重量部に対して溶解した後、25℃に冷却した時の水溶液のpHは6.59、ホウ酸濃度は17.2重量%であった。
実施例2で用いられた染料を国際公開特許番号 WO2007/148757の実施例7に示される染料に変えた以外は同様にして偏光素子、ならびに、偏光板を得て、測定試料とした。0.65重量部の偏光素子を熱水(90~100℃)100重量部に対して溶解した後、25℃に冷却した時の水溶液のpHは6.66、ホウ酸濃度は16.8重量%であった。
実施例2で用いられた染料を特許出願番号 2011-023747の実施例1に示される染料に変えた以外は同様にして偏光素子、ならびに、偏光板を得て、測定試料とした。0.65重量部の偏光素子を熱水(90~100℃)100重量部に対して溶解した後、25℃に冷却した時の水溶液のpHは6.56、ホウ酸濃度は16.5重量%であった。
実施例3において、酢酸ナトリウムを炭酸ナトリウムに変えて、処理する水溶液のpHを8.2に変えた以外は同様にして偏光素子、ならびに、偏光板を得て、測定試料とした。0.65重量部の偏光素子を熱水(90~100℃)100重量部に対して溶解した後、25℃に冷却した時の水溶液のpHは6.74、ホウ酸濃度は15.7重量%であった。
実施例3において、酢酸ナトリウムをアンモニアに変えて、処理する水溶液のpHを8.2に変えた以外は同様にして偏光素子、ならびに、偏光板を得て、測定試料とした。0.65重量部の偏光素子を熱水(90~100℃)100重量部に対して溶解した後、25℃に冷却した時の水溶液のpHは6.38、ホウ酸濃度は16.1重量%であった。
実施例3において、酢酸ナトリウムを水酸化ナトリウムに変えて、処理する水溶液のpHを8.2に変えた以外は同様にして偏光素子、ならびに、偏光板を得て、測定試料とした。0.65重量部の偏光素子を熱水(90~100℃)100重量部に対して溶解した後、25℃に冷却した時の水溶液のpHは6.77、ホウ酸濃度は16.7重量%であった。
実施例1で用いられた染料を公開特許公報 昭63-189803号の実施例16に記載されている染料に変えて、延伸後に処理する水溶液に含まれていた酢酸ナトリウムを炭酸ナトリウムにし、該水溶液のpHを10.5に変えた以外は同様にして偏光素子、ならびに、偏光板を得て、測定試料とした。0.65重量部の偏光素子を熱水(90~100℃)100重量部に対して溶解した後、25℃に冷却した時の水溶液のpHは7.24、ホウ酸濃度は17.7重量%であった。
実施例1で用いられた染料を国際公開特許番号WO2009/154055の実施例1で示される染料に変えて、延伸後に処理する水溶液に含まれていた酢酸ナトリウムを炭酸ナトリウムにし、該水溶液のpHを10.5に変えた以外は同様にして偏光素子、ならびに、偏光板を得て、測定試料とした。0.65重量部の偏光素子を熱水(90~100℃)100重量部に対して溶解した後、25℃に冷却した時の水溶液のpHは7.43、ホウ酸濃度は17.1重量%であった。
実施例7において、処理する水溶液のpHを11.2に変えた以外は同様にして偏光素子、ならびに、偏光板を得て、測定試料とした。0.65重量部の偏光素子を熱水(90~100℃)100重量部に対して溶解した後、25℃に冷却した時の水溶液のpHは8.08、ホウ酸濃度は16.3重量%であった。
実施例1において、酢酸ナトリウムを用いずにpH=6.84の水で15秒間処理を行った以外は同様にして偏光素子、ならびに、偏光板を得て、測定試料とした。0.65重量部の偏光素子を熱水(90~100℃)100重量部に対して溶解した後、25℃に冷却した時の水溶液のpHは5.68、ホウ酸濃度は15.9重量%であった。
実施例3において、酢酸ナトリウムを用いずにpH=6.84の水で15秒間処理を行った以外は同様にして偏光素子、ならびに、偏光板を得て、測定試料とした。0.65重量部の偏光素子を熱水(90~100℃)100重量部に対して溶解した後、25℃に冷却した時の水溶液のpHは5.65、ホウ酸濃度は16.9重量%であった。
実施例4において、酢酸ナトリウムを用いずにpH=6.84の水で15秒間処理を行った以外は同様にして偏光素子、ならびに、偏光板を得て、測定試料とした。0.65重量部の偏光素子を熱水(90~100℃)100重量部に対して溶解した後、25℃に冷却した時の水溶液のpHは5.59、ホウ酸濃度は16.7重量%であった。
実施例8において、酢酸ナトリウムを用いずにpH=6.84の水で15秒間処理を行った以外は同様にして偏光素子、ならびに、偏光板を得て、測定試料とした。0.65重量部の偏光素子を熱水(90~100℃)100重量部に対して溶解した後、25℃に冷却した時の水溶液のpHは5.55、ホウ酸濃度は16.0重量%であった。
実施例9において、酢酸ナトリウムを用いずにpH=6.84の水で15秒間処理を行った以外は同様にして偏光素子、ならびに、偏光板を得て、測定試料とした。0.65重量部の偏光素子を熱水(90~100℃)100重量部に対して溶解した後、25℃に冷却した時の水溶液のpHは5.62、ホウ酸濃度は16.9重量%であった。
実施例8において、延伸後に処理する水溶液に含まれていた炭酸ナトリウムをシュウ酸にして、該水溶液のpHを3.0に変えた以外は同様にして偏光素子、ならびに、偏光板を得て、測定試料とした。0.65重量部の偏光素子を熱水(90~100℃)100重量部に対して溶解した後、25℃に冷却した時の水溶液のpHは4.77、ホウ酸濃度は16.7重量%であった。
実施例9において、延伸後に処理する水溶液に含まれていた炭酸ナトリウムをシュウ酸にして、該水溶液のpHを3.0に変えた以外は同様にして偏光素子、ならびに、偏光板を得て、測定試料とした。0.65重量部の偏光素子を熱水(90~100℃)100重量部に対して溶解した後、25℃に冷却した時の水溶液のpHは4.91、ホウ酸濃度は18.1重量%であった。
ヨウ素系偏光板(ポラクテノ社製 SKN-18243P)を、ジクロロメタンに浸漬してTACを溶解し、ヨウ素系の二色性染料を含有する偏光素子を得た。得られた偏光素子を実施例1で用いた酢酸ナトリウム 0.8重量%を含有したpHが8.01である水溶液で15秒間処理を行った。処理して得られたフィルムを直ちに60℃で5分間乾燥処理を行い膜厚29μmの偏光素子を得た。0.65重量部の偏光素子を熱水(90~100℃)100重量部に対して溶解した後、25℃に冷却した時の水溶液のpHは5.52、ホウ酸濃度は16.5重量%であった。その偏光素子を用いてアルカリ処理した膜厚80μmのトリアセチルセルロースフィルム(富士写真フィルム社製 TD-80U、以下TACと省略)と、ポリビニルアルコール系接着剤を用いて、偏光素子/接着層/TACという構成で積層し、ラミネートして偏光板を得て測定試料とした。
Claims (14)
- 二色性染料が吸着されて延伸されてなるポリビニルアルコール樹脂フィルムよりなる偏光素子であって、0.65重量部の該偏光素子を熱水(90乃至100℃)100重量部に対して溶解した後、25℃に冷却した時、該水溶液のpHが5.9乃至9.0を示すことを特徴とする偏光素子。
- 二色性染料がアゾ系化合物であることを特徴とする請求項1に記載の偏光素子
- ホウ酸含有量が、5乃至28重量%であることを特徴とする請求項1または2に記載の偏光素子。
- Aがカルボニル基を有するフェニル基であることを特徴とする請求項4乃又は5に記載の偏光素子
- Aがヒドロキシル基を有するフェニル基であることを特徴とする請求項4又は5に記載の偏光素子
- 請求項1乃至7のいずれか1項に記載の偏光素子の少なくとも片面に支持体フィルムを設けてなる偏光板。
- 無機基板に請求項1に記載の偏光素子または請求項8に記載の偏光板が積層されたことを特徴とする無機基板付偏光板。
- 液晶プロジェクターに用いられる請求項1乃至7のいずれか1項に記載の偏光素子または請求項8~9のいずれかに記載に偏光板。
- 請求項1乃至7、10に記載の偏光素子が搭載されたプロジェクター。
- 請求項8乃至10のいずれか1項に記載の偏光板が搭載されたプロジェクター。
- アゾ系化合物である二色性染料が吸着されて延伸されてなるポリビニルアルコール樹脂フィルムよりなる偏光素子の製造方法であって、pHが7.5乃至12である水溶液で処理されてなる該製造方法
- アゾ系化合物である二色性染料が吸着されて延伸されてなるポリビニルアルコール樹脂フィルムよりなる偏光素子の製造方法であって、延伸処理を行なった後、pHが7.5乃至12である水溶液へ浸漬させ、直ちに乾燥処理を行うことを特徴とする該製造方法
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JP2014510188A JP6345114B2 (ja) | 2012-04-13 | 2013-04-10 | 偏光素子及び偏光板 |
CN201380018822.6A CN104335084B (zh) | 2012-04-13 | 2013-04-10 | 偏振元件及偏振片 |
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2019103003A1 (ja) * | 2017-11-24 | 2019-05-31 | 日東電工株式会社 | 偏光子の製造方法 |
WO2019103002A1 (ja) * | 2017-11-24 | 2019-05-31 | 日東電工株式会社 | 偏光子および偏光板 |
JP2021192091A (ja) * | 2020-02-07 | 2021-12-16 | 住友化学株式会社 | 偏光フィルムの製造方法 |
WO2022172755A1 (ja) | 2021-02-09 | 2022-08-18 | 大倉工業株式会社 | 偏光板 |
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JP6662739B2 (ja) * | 2015-10-06 | 2020-03-11 | 日本化薬株式会社 | 無彩色な偏光素子、並びにこれを用いた無彩色偏光板および液晶表示装置 |
JP6734745B2 (ja) * | 2015-10-14 | 2020-08-05 | 日東電工株式会社 | 偏光子およびその製造方法 |
JP6853010B2 (ja) * | 2015-11-06 | 2021-03-31 | 日本化薬株式会社 | 無彩色な偏光素子、並びにこれを用いた無彩色偏光板および液晶表示装置 |
CN109863432A (zh) * | 2016-11-14 | 2019-06-07 | 日本化药株式会社 | 用于红外线波长区域的染料系偏光板 |
CN114425850A (zh) * | 2021-12-31 | 2022-05-03 | 莆田三利谱光电科技有限公司 | 一种对紫外光具有高偏振度的pva膜及包括其的偏光片 |
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JPH07104126A (ja) * | 1993-10-05 | 1995-04-21 | Kuraray Co Ltd | 偏光フィルムの製造方法 |
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WO2019103003A1 (ja) * | 2017-11-24 | 2019-05-31 | 日東電工株式会社 | 偏光子の製造方法 |
WO2019103002A1 (ja) * | 2017-11-24 | 2019-05-31 | 日東電工株式会社 | 偏光子および偏光板 |
JPWO2019103003A1 (ja) * | 2017-11-24 | 2020-10-01 | 日東電工株式会社 | 偏光子の製造方法 |
JPWO2019103002A1 (ja) * | 2017-11-24 | 2020-10-01 | 日東電工株式会社 | 偏光子および偏光板 |
JP2021192091A (ja) * | 2020-02-07 | 2021-12-16 | 住友化学株式会社 | 偏光フィルムの製造方法 |
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WO2022172755A1 (ja) | 2021-02-09 | 2022-08-18 | 大倉工業株式会社 | 偏光板 |
KR20230131283A (ko) | 2021-02-09 | 2023-09-12 | 오꾸라 고교 가부시키가이샤 | 편광판 |
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TW201348763A (zh) | 2013-12-01 |
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HK1205268A1 (en) | 2015-12-11 |
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