WO2007125696A1 - 偏光膜の製造方法、及び液晶表示装置 - Google Patents
偏光膜の製造方法、及び液晶表示装置 Download PDFInfo
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- WO2007125696A1 WO2007125696A1 PCT/JP2007/055607 JP2007055607W WO2007125696A1 WO 2007125696 A1 WO2007125696 A1 WO 2007125696A1 JP 2007055607 W JP2007055607 W JP 2007055607W WO 2007125696 A1 WO2007125696 A1 WO 2007125696A1
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- polarizing film
- treatment
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Classifications
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- 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
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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
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
-
- 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
-
- 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
Definitions
- the present invention relates to a method for manufacturing a polarizing film having a high dichroic ratio, and a liquid crystal display device including the polarizing film.
- a polarizing film used for a liquid crystal display device or the like a film obtained by stretching a polymer film mainly composed of polybulal alcohol resin dyed with iodine is used.
- the above polarizing film is produced by a stretching method, it is easy to tear in the stretching direction.
- a large dimensional change occurs in the polarizing film with changes in temperature and humidity, thereby causing various adverse effects such as a reduction in contrast ratio and display unevenness.
- Patent Document 1 Japanese Patent Laid-Open No. 2005-154746
- An object of the present invention is to provide a method for producing a polarizing film having a high dichroic ratio.
- the objective of this invention is providing a liquid crystal display device provided with the polarizing film obtained by this manufacturing method.
- the method for producing a polarizing film of the present invention includes the following steps (1) to (3):
- the embodiment includes the step (1) force of reducing sulfate ions from the solution solution.
- the dichroic dye is an organic compound containing a sulfone group, a carboxyl group, or an amino group, or a salt thereof.
- the solvent is water.
- the electrical conductivity of the water is 20 ⁇ SZcm or less.
- the concentration of the solution is 5 wt% to 40 wt%.
- the hydrophilization treatment is a treatment for reducing the contact angle of water at 23 ° C of the substrate by 10% or more compared to before the treatment.
- the hydrophilization treatment is a treatment in which the contact angle of water at 23 ° C of the substrate is 5 ° to 60 °.
- the hydrophilization treatment is a corona treatment, a plasma treatment, an alkali treatment, or an anchor coat treatment.
- the base material is a glass substrate or a polymer film.
- the polymer film contains a cellulosic resin.
- the liquid crystal display device of the present invention is characterized by including a polarizing film obtained by any one of the above manufacturing methods.
- the method for producing a polarizing film of the present invention can obtain a polarizing film having a remarkably high dichroic ratio as compared with a conventional method for producing a polarizing film, due to a synergistic action by a combination of steps.
- the manufacturing method of the polarizing film of the present invention includes the following steps (1) to (3).
- a polarizing film that can be obtained by such a manufacturing method can provide excellent polarizing characteristics with a dichroic ratio that is remarkably higher than that of a polarizing film produced by a conventional manufacturing method.
- the dichroic ratio of the polarizing film at a wavelength of 600 nm is preferably 25 or more, more preferably 28 or more, and particularly preferably 30 or more.
- a polarizing film having a dichroic ratio in the above range can provide a high contrast ratio when used in, for example, a liquid crystal display device. Furthermore, since it is not necessary to use a stretching operation during the manufacturing process, it is difficult to cause a dimensional change in the polarizing film. As a result, it is difficult to cause a decrease in contrast ratio or display unevenness, and a liquid crystal display device can be obtained.
- Step (1) of the present invention is a step of preparing a solution exhibiting lyotropic liquid crystallinity having an electric conductivity of 50 / z SZcm or less (in terms of 0.05% by weight) and containing a dichroic dye and a solvent. is there.
- Nio Te and the "electrical conductivity" represent through ease of substances electrical means the conductivity of the material lying between the cross-sectional area 1 cm 2, the distance lcm opposing electrode . The smaller this value, the less likely the liquid will conduct electricity.
- “0.05% by weight conversion” means the electric conductivity when the concentration of the solution used in the present invention is 0.05% by weight.
- the electric conductivity in terms of 0.05% by weight is, for example, the value of 1Z20 of the electric conductivity of the liquid having a concentration of 1% by weight, and the value of 1Z10 of the electric conductivity of the solution being 0.5% by weight. It is.
- the electrical conductivity (in terms of 0.05% by weight) of the solution used in the present invention is SZcm or less, preferably 40 ⁇ SZcm or less, particularly preferably 30 ⁇ SZcm or less, most preferably 20 SZcm or less.
- the lower limit of the electrical conductivity is 0.1 SZcm as a feasible value.
- the reverse osmosis membrane separates a stock solution (solution) into a concentrated solution containing a dichroic dye and a permeate containing monovalent or divalent ions.
- the average pore diameter of the reverse osmosis membrane is preferably 2 ⁇ 10 _8 cm to 20 ⁇ 10 _8 cm, more preferably 5 ⁇ 10 _8 cm to: LO X 10 _8 cm.
- Examples of the material for forming the reverse osmosis membrane include a polyamide-based resin, a polyesteramide-based resin, a polypiperazineamide-based resin, and a cross-linked water-soluble vinyl polymer.
- the structure of the reverse osmosis membrane includes, for example, an asymmetric membrane having a dense layer on at least one side of the membrane, and having fine pores with gradually increasing pore diameters from the dense layer toward the inside of the membrane or the other side.
- a composite membrane having a thin separation functional layer formed of another material on the dense layer of the asymmetric membrane can be used.
- the reverse osmosis membrane can be used in any form such as a hollow fiber membrane form or a flat membrane form.
- the step (1) preferably includes a treatment for reducing sulfate ions from the solution.
- the treatment for reducing sulfate ions from the solution is preferably performed using a reverse osmosis membrane.
- an aqueous solution with reduced sulfate ions can be obtained by allowing an aqueous solution containing sulfate ions to pass through the reverse osmosis membrane at a pressure equal to or higher than the osmotic pressure.
- the solution used in the present invention contains a dichroic dye and a solvent, and exhibits lyotropic liquid crystallinity.
- “lyotropic liquid crystallinity” means a property of causing a phase transition of an isotropic liquid crystal phase by changing a temperature or a concentration of a dichroic dye (solute).
- the liquid crystal phase include a nematic liquid crystal phase, a smectic liquid crystal phase, and a cholesteric liquid crystal phase that are not particularly limited. These liquid crystal phases can be confirmed and identified by the optical pattern of the liquid crystal phase observed with a polarizing microscope.
- the solution can orient the dichroic dye by exhibiting lyotropic liquid crystallinity.
- the dichroic dye used in the present invention has a wavelength of 400 ⁇ ! ⁇ 780nm! Is an organic compound that absorbs light of any wavelength.
- the term “dichroic dye” refers to a dye having a large transition moment in the major axis direction of the dye molecule or a larger transition moment in the minor axis direction than in the major axis direction.
- the dichroic dye may be selected from any appropriate one depending on the purpose, but is preferably a lyotropic liquid crystal in a solution state. It is an organic compound exhibiting properties (ie, lyotropic liquid crystal).
- the above dichroic dye is particularly preferable because it exhibits a nematic liquid crystal phase in a solution state at room temperature and is excellent in force orientation.
- the dichroic dye is classified according to chemical structure, for example, an azo dye, an anthraquinone dye, a perylene dye, an indanthrone dye, an imidazolone dye, an indigoid dye, Oxazine dyes, phthalocyanine dyes, tri-phenolate dyes, pyrazolone dyes, stilbene dyes, diphenylmethane dyes, naphthoquinone dyes, methocyanine dyes, quinophthalone dyes, xanthene dyes, alizarin dyes, atalidine Dyes, quinone imine dyes, thiazole dyes, methine dyes, nitro dyes, nitroso dyes, and the like.
- chemical structure for example, an azo dye, an anthraquinone dye, a perylene dye, an indanthrone dye, an imidazolone dye, an indigoid dye, Oxazine dyes, phthalocyanine dye
- azo dyes anthraquinone dyes, perylene dyes, indanthrone dyes, and imidazole dyes are preferable.
- dichroic dyes can be used alone or in admixture of two or more.
- the dichroic dye is preferably a sulfone group (one SO H), a carboxyl group (one COO
- any of the salts (wherein R represents an optional substituent), particularly preferably an organic compound containing a sulfone group, or a salt thereof.
- Introduction of a sulfone group into a dichroic dye is effective for improving the solubility in water.
- the solubility in water increases as the number of sulfone groups introduced into the dichroic dye increases.
- the number of the sulfone groups is appropriately selected so that the solubility in the solvent and the water resistance after forming the polarizing film are compatible.
- dichroic dye it is preferable to use, for example, a lyotropic liquid crystalline dichroic dye represented by the following general formula (1).
- hydrogen ions As M in formula (1), hydrogen ions, ions of group 1 metals such as Li, Na, K, and Cs, and ammonia ions are preferred.
- chromogen sites include azo derivative units, anthraquinone derivative units, perylene. Preferred are those containing thiophene derivative units, indanthrone derivative units, and z or imidazole derivative units.
- the dichroic dye represented by the general formula (1) has a chromogen such as an azo compound or a polycyclic compound structure as a hydrophobic site in a solution, and sulfonic acid and its salt. Becomes a hydrophilic part, and the hydrophobic part and the hydrophilic part gather together by the balance between them, and the lyotropic liquid crystal phase is expressed as a whole.
- dichroic dye represented by the general formula (1) include compounds represented by the following general formulas (2) to (8).
- R 1 is hydrogen or chlorine
- R 2 is hydrogen, an alkyl group, ArNH or ArCON H.
- alkyl group a methyl group or an ethyl group is more preferable among alkyl groups having 1 to 4 carbon atoms.
- aryl group (Ar) a substituted or unsubstituted phenyl group is preferred, but a phenyl group substituted with chlorine at the 4-position is more preferred.
- M is the same as in the general formula (1).
- A is represented by the formula (A) or (B), and n is 2 or 3.
- R 3 in A represents hydrogen, an alkyl group, a halogen or an alkoxy group
- Ar represents a substituted or unsubstituted aryl group.
- an alkyl group having 1 to 4 carbon atoms is preferable, and a methyl group or an ethyl group is more preferable.
- the halogen is preferably bromine or chlorine.
- the alkoxy group is more preferably a methoxy group, among which an alkoxy group having 1 or 2 carbon atoms is preferred.
- the aryl group is preferably a substituted or unsubstituted phenyl group which is unsubstituted or substituted at the 4-position with a methoxy group, ethoxy group, chlorine or butyl group, or at the 3-position with a methyl group. Is preferred.
- M is the same as in the general formula (1).
- n 3 to 5
- M is the same as the general formula (1).
- M is the same as the general formula (1).
- M is the same as the general formula (1).
- the method for introducing a sulfone group into the organic compound is, for example, a method in which sulfuric acid, chlorosulfonic acid, or fuming sulfuric acid is allowed to act on the organic compound to replace nuclear hydrogen with the sulfone group.
- the salt of the organic compound is obtained by replacing a hydrogen atom capable of dissociating an acid with a monovalent cation such as lithium ion, sodium ion, potassium ion, cesium ion or ammonium ion.
- dichroic dyes described above are disclosed in, for example, JP-A-2006-047966, JP-A-2005-255846, JP-A-2005-154746, JP-A-2002-090526. , Compounds described in JP-T 8-511109, JP-T 2004-528603, etc. Can be used.
- a commercially available dichroic dye can also be used.
- Commercially available dichroic dyes include CI DirectB67, DSCG (INTAL), RU31.156, Metyl orange ⁇ AH 6556, Sirius Supra Brown RLL, Benzopurpurin, Copper-tetracarboxy phthalocyanine ⁇ Acid Red 266, Cyanine Dye, Violet 20, Examples include Perylenebiscarboximides, Benzopurpurin 4B, Methyleneblue (Basic Blue 9), Brillant Yellow, Acid Red 18, and Acid Red 27.
- the solvent used in the present invention is used for dissolving the dichroic dye to develop lyotropic liquid crystallinity.
- Any appropriate solvent can be selected.
- the solvent may be, for example, an inorganic solvent such as water, alcohols, ketones, ethers, esters, aliphatic and aromatic hydrocarbons, halogenated hydrocarbons, imides, Organic solvents such as cellosolves may be used.
- Examples of the solvent include n-butanol, 2-butanol, cyclohexanol, isopropyl alcohol, tert-butyl alcohol, glycerin, ethylene glycol, acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, cyclopenta Non, 2-pentanone, 2-hexanone, jetyl ether, tetrahydrofuran, dioxane, azole, ethyl acetate, butyl acetate, methyl lactate, n-hexane, benzene, toluene, xylene, black-form, di Examples include chloromethane, dichloroethane, dimethylformamide, dimethylacetamide, methyl cellosolve, and ethyl acetate solve. These solvents can be used alone or in admixture of two or more.
- the solvent is water.
- the electric conductivity of the water is preferably 20 ⁇ S / cm or less, more preferably 0.001 ⁇ S / cm lO S / cm, particularly preferably 0.001 SZcm to 5 ⁇ SZcm. is there.
- the lower limit of the electrical conductivity of the water is 0 ⁇ SZcm.
- the concentration of the solution can be appropriately adjusted within the range showing lyotropic liquid crystallinity depending on the type of dichroic dye used.
- the concentration of the dichroic dye in the solution is preferably 5% by weight to 40% by weight, more preferably 5% by weight to 35% by weight, and particularly preferably 5% by weight. % By weight to 30% by weight.
- the solution may further contain any appropriate additive.
- the additives include surfactants, plasticizers, heat stabilizers, light stabilizers, lubricants, antioxidants, ultraviolet absorbers, flame retardants, colorants, antistatic agents, compatibilizers, and crosslinking agents. , And thickeners.
- the amount of the additive is preferably more than 0 and 10 parts by weight or less with respect to 100 parts by weight of the solution.
- the solution may further contain a surfactant.
- the surfactant is used to improve the wettability and coating property of the dichroic dye to the substrate surface.
- the above surfactant is preferably a nonionic surfactant.
- the amount of the surfactant added is preferably more than 0 and 5 parts by weight or less with respect to 100 parts by weight of the solution.
- Step (2) of the present invention is a step of preparing a base material on which at least one surface has been subjected to a hydrophilic treatment.
- hydrophilic treatment refers to a treatment for reducing the water contact angle of a substrate. The hydrophilization treatment is used to improve the wettability and coating property of the substrate surface on which the dichroic dye is applied.
- the hydrophilization treatment is a treatment in which the contact angle of water at 23 ° C of the substrate is preferably reduced by 10% or more, more preferably 15% to 80%, compared to before the treatment. Particularly preferred is a treatment for reducing by 20% to 70%.
- the ratio (%) to be reduced is obtained by the equation: ⁇ (contact angle before treatment ⁇ contact angle after treatment) Z contact angle before treatment ⁇ X100.
- the hydrophilization treatment is a treatment to reduce the contact angle of water at 23 ° C of the substrate, preferably 5 ° or more, more preferably 10 ° to 65 ° compared to before treatment.
- This is a treatment for lowering, particularly preferably a treatment for lowering by 20 ° to 60 °.
- the hydrophilization treatment is a treatment in which the contact angle of water at 23 ° C of the substrate is preferably 5 ° to 60 °, and more preferably 5 ° to 50 °. Particularly preferred is a treatment of 5 ° to 45 °.
- a polarizing film having a high dichroic ratio and a small thickness variation can be obtained.
- Any appropriate method may be adopted for the hydrophilic treatment.
- the hydrophilization treatment may be, for example, a dry treatment or a wet treatment.
- Examples of the dry treatment include discharge treatment such as corona treatment, plasma treatment, and glow discharge treatment, flame treatment, ozone treatment, UV ozone treatment, ionizing active ray treatment such as ultraviolet ray treatment and electron beam treatment.
- Examples of the wet treatment include ultrasonic treatment using a solvent such as water and acetone, alkali treatment, anchor coat treatment, and the like. These treatments may be used alone or in combination of two or more.
- the hydrophilic treatment is a corona treatment, a plasma treatment, an alkali treatment, or an anchor coat treatment.
- a polarizing film having a high dichroic ratio and a small thickness variation can be obtained.
- the conditions for the hydrophilization treatment such as the treatment time and strength, can be appropriately adjusted as appropriate so that the water contact angle of the substrate falls within the above range.
- the corona treatment is typically a treatment for modifying the substrate surface by passing the substrate through corona discharge.
- the corona discharge is generated by applying high frequency and high voltage between a grounded dielectric roll and an insulated electrode, whereby the air between the electrodes breaks down and is ionized.
- the plasma treatment is typically a treatment for modifying the substrate surface by passing the substrate through low-temperature plasma.
- an inorganic gas such as a low-pressure inert gas, oxygen, or halogen gas
- the low-temperature plasma is generated by ionizing part of gas molecules.
- the ultrasonic cleaning treatment is typically a treatment that improves the wettability of the substrate by removing the contaminants on the surface of the substrate by immersing the substrate in water or an organic solvent and applying ultrasonic waves. It is.
- the alkali treatment is typically a treatment for modifying the surface of the substrate by immersing the substrate in an alkali treatment solution in which a basic substance is dissolved in water or an organic solvent.
- the anchor coating treatment is typically a treatment for applying an anchor coating agent to the substrate surface.
- the substrate used in the present invention is used for uniformly coating a solution containing the dichroic dye and the solvent.
- Any appropriate substrate can be selected.
- the substrate include glass substrates, quartz substrates, polymer films, plastics substrates, metal plates such as aluminum and iron, ceramic substrates, and silicon wafers. the above The substrate is preferably a glass substrate or a polymer film.
- the glass substrate is preferably used for a liquid crystal cell, and is, for example, soda lime (blue plate) glass containing an alkali component or low alkali borosilicate glass.
- a commercially available glass substrate may be used as it is. Examples of commercially available glass substrates include glass cords manufactured by Kojung Co., Ltd .: 1737, glass codes manufactured by Asahi Glass Co., Ltd .: AN635, glass codes manufactured by NH Techno Glass Co., Ltd .: NA-35, and the like.
- Any appropriate resin can be selected as the resin forming the polymer film.
- the polymer film contains a thermoplastic resin.
- the thermoplastic resin include polyolefin resin, cycloolefin resin, polysalt-vinyl resin, cell mouth resin, styrene resin, polymethyl methacrylate, polyacetic acid Vinyl, polysalt-vinylidene resin, polyamide resin, polyacetal resin, polycarbonate resin, polybutylene terephthalate resin, polyethylene terephthalate resin, polysenophone resin, polyethersulfone
- a system resin a polyether ether ketone system resin, a polyarylate system resin, a polyamideimide system resin, and a polyimide system resin.
- thermoplastic resin can be used alone or in combination of two or more.
- thermoplastic resin can also be used with any suitable polymer modification.
- examples of the polymer modification include modifications such as copolymerization, crosslinking, molecular terminals, and stereoregularity.
- a polymer film When a polymer film is used as the substrate, it is preferable to use a polymer film having excellent visible light transmittance and excellent transparency.
- the polymer film has a light transmittance in visible light of preferably 80% or more, more preferably 90% or more.
- the light transmittance is the Y value obtained by correcting the visibility based on the spectral data measured with a spectrophotometer (product name: U-4100, manufactured by Hitachi, Ltd.) with a film thickness of 100 m.
- the haze value of the polymer film is preferably 3% or less, more preferably 1% or less.
- the haze value is a value measured according to JIS-K7105.
- the substrate can be used as a protective film for the polarizing film after forming the polarizing film.
- the base material used in the present invention is preferably a polymer film containing cellulosic resin. This is because a polarizing film having excellent dichroic dye wettability, high dichroic ratio, and small thickness variation can be obtained.
- the cellulose-based resin preferably has a part or all of hydroxyl groups of cellulose having a acetyl group or propio group.
- cellulose organic acid ester or cellulose mixed organic acid ester substituted with zul group and z or butyl group.
- the cellulose organic acid ester include cenorelose acetate, cenorelose propionate, cenorelose butyrate, and the like.
- the cellulose mixed organic acid ester include cellulose acetate propionate and cellulose acetate butyrate.
- the cellulose-based resin can be obtained, for example, by the method described in JP-A-2001-188128 [0040] to [0041].
- a commercially available polymer film can be used as it is.
- a commercially available polymer film that has been subjected to secondary processing such as stretching and Z or shrinkage treatment
- Examples of commercially available polymer films containing cellulosic resin include, for example, Fuji Photo Film Co., Ltd. Fujitac Series (trade name: ZR F80S, TD80UF, TDY-80UL), Co-Force Minoltopto Co., Ltd. Names include “KC8UX 2M”.
- the thickness of the substrate is preferably 20 ⁇ m to 100 ⁇ m. By making the thickness of the base material within the above range, the handling and coating properties of the base material are excellent.
- step (1) and the step (2) are performed is not particularly limited, and the step (2) may be performed after the step (1) is performed first. After performing (2) first, step (1) may be performed, or step (1) and step (2) may be performed in parallel.
- the solution prepared in the above step (1) is applied to the surface of the base material prepared in the above step (2) at a coating speed of lOOmmZ seconds or more, It is a process of drying.
- the coating speed is lOOmmZ seconds or more, more preferably 500 mmZ seconds to 8000 mmZ seconds, and particularly preferably 800 mmZ seconds to 6000 mmZ seconds. Also preferably, lOOOmmZ seconds to 4000 mmZ seconds.
- the coating speed for improving the uniformity of the coating film is low.
- a polarizing film having a high dichroic ratio and a small thickness variation can be obtained by using the coating speed defined in the present invention. According to the estimation of the present inventors, a polarizing film having a high dichroic ratio and a small thickness variation is obtained because of a shear force suitable for orienting the dichroic dye in the solution. It is thought to save.
- a coating method using an appropriate coater may be employed as appropriate.
- the coater include, for example, a reverse roll coater, a forward rotation roll coater, a gravure coater, a knife coater, a rod coater, a slot die coater, a slot orifice coater, a curtain coater, a fountain coater, an air doctor coater, a kiss coater, a dip coater, a bead coater, and a blade coater.
- the coater is preferably a reno-slow roll coater, a forward rotary roll coater, a gravure coater, a rod coater, a slot die coater, a slot orifice coater, a cardeno coater, and a fountain coater.
- a polarizing film having a small thickness variation can be obtained.
- the drying method may be, for example, a drying means such as an air circulation type constant temperature oven in which hot or cold air circulates, a heater using microwaves or far infrared rays, a roll heated for temperature control, a heat pipe roll or a metal belt. Can be mentioned.
- a drying means such as an air circulation type constant temperature oven in which hot or cold air circulates, a heater using microwaves or far infrared rays, a roll heated for temperature control, a heat pipe roll or a metal belt.
- the temperature at which the solution is dried is equal to or lower than the isotropic phase transition temperature of the solution, and it is preferable that the temperature is gradually raised from a low temperature to a high temperature to be dried.
- the drying temperature is preferably 10 ° C to 80 ° C, more preferably 20 ° C to 60 ° C. A polarizing film having a small thickness variation can be obtained within the above temperature range.
- the time for drying the solution can be appropriately selected depending on the drying temperature and the type of the solvent, but is preferably 1 to 60 minutes, for example, in order to obtain a polarizing film with small thickness variation. Is 5 to 40 minutes. [0066] [E. Other steps]
- the method for producing a polarizing film of the present invention preferably further includes a step (4) after the above steps (1) to (3):
- the film obtained in the above step (3) is selected from the group consisting of aluminum salt, barium salt, lead salt, chromium salt, strontium salt, and a compound salt having two or more amino groups in the molecule. Contacting with a solution comprising at least one selected compound salt.
- the step (4) is used for making the obtained polarizing film insoluble or hardly soluble in water.
- the compound salt include, for example, salt-aluminum, salt-barium, lead chloride, salt-chromium, strontium chloride, 4,4,1-tetramethyldiaminodiphenylmethane hydrochloride, 2,2'-dipyridyl hydrochloride, 4,4'-dipyridyl hydrochloride, melamine hydrochloride, tetraaminopyrimidine hydrochloride and the like. With such a compound salt, a polarizing film having excellent water resistance can be obtained.
- the concentration of the compound salt in the solution containing the above compound salt is preferably 3% by weight to 40% by weight, and particularly preferably 5% by weight to 30% by weight.
- Examples of the method of bringing the film obtained in the step (3) into contact with the solution containing the compound salt include, for example, a method of applying a solution containing the compound salt to the surface of the film, Any method such as a method of immersing in a solution containing the above compound salt may be employed. When these methods are employed, the obtained film is preferably washed with water or an arbitrary solvent, and further dried to obtain a polarizing element having excellent adhesion at the interface between the substrate and the polarizing film. Can be obtained.
- the polarizing film obtained by the production method of the present invention can be used for any appropriate application.
- the application of the polarizing film is incorporated as an optical member of a liquid crystal display device.
- the polarizing film can be used in any form.
- the form of the polarizing film may be, for example, a single polarizing film or a laminate including a base material and a polarizing film.
- the polarizing film may be sandwiched between two base materials via an arbitrary adhesive layer.
- a retardation film is stacked on a polarizing film or a laminate of a substrate and a polarizing film. It may be in the form of a layered polarizing plate.
- the polarizing film may include an adhesive layer on at least one side.
- the “adhesive layer” refers to a layer that joins surfaces of adjacent objects and integrates them with practically sufficient adhesive force and adhesion time.
- the material for forming the adhesive layer include an adhesive and an anchor coat agent.
- the adhesive layer may have a multilayer structure in which an anchor coat layer is formed on the surface of the adherend and an adhesive layer is formed thereon. Further, it may be a thin layer (also called a hairline) that cannot be recognized by the naked eye.
- an appropriate adhesive or anchor coating agent can be appropriately selected according to the type and purpose of the adherend.
- Specific examples of adhesives include solvent type adhesives, emulsion emulsion type adhesives, pressure sensitive adhesives, rewet adhesives, polycondensation type adhesives, solventless adhesives, and film adhesives according to the classification by shape. Agents and hot melt adhesives. Classification by chemical structure includes synthetic resin adhesives, rubber adhesives, and natural product adhesives.
- the adhesive includes a viscoelastic substance (also called an adhesive) that exhibits an adhesive force that can be sensed by pressure contact at room temperature.
- Applications of the liquid crystal display device including the polarizing film of the present invention include, for example, OA equipment such as a personal computer monitor, a notebook personal computer, a copy machine, a mobile phone, a clock, a digital camera, a personal digital assistant (PDA), and a mobile game.
- Display devices such as portable devices such as video cameras, household electrical devices such as video cameras, televisions, and microwave ovens, knock monitors, monitors for car navigation systems, in-car devices such as car audio, and information monitors for commercial stores
- Security equipment such as monitoring monitors, nursing care medical equipment such as nursing monitors and medical monitors.
- the transmittance for each linearly polarized light is defined as 100% of the completely polarized light obtained through the Dalant Thompson prism polarizer; k and k were determined.
- K represents the transmittance of linearly polarized light in the maximum transmittance direction
- k is orthogonal to the maximum transmittance direction
- the dispersion of the single transmittance can be measured by using a birefringence phase difference measuring device [Product name “RE TS-1200RF” manufactured by Otsuka Electronics Co., Ltd.] at any 10 locations in the sample (size: 5cm X 5cm). Was measured, and the standard deviation of single transmittance (Ts) was determined.
- K represents the transmittance of linearly polarized light in the direction orthogonal to the maximum transmittance direction.
- the dichroic dye containing a lyotropic liquid crystal (organic compound) containing a sulfone group (trade name “LC Volalyzer I N015” manufactured by OPTIVA) and pure water (electric conductivity: 1. SZcm)
- An aqueous solution adjusted to a concentration of 0.25% by weight was reversed by Nitto Denko Corporation.
- an aqueous solution containing the dichroic dye of the lyotropic liquid crystal was adjusted using a rotary evaporator so that the concentration of the dichroic dye was 12.2% by weight.
- the aqueous solution obtained here was observed with a polarizing microscope, it showed a nematic liquid crystal phase at 23 ° C.
- a polymer film mainly composed of 80 ⁇ m thick triacetyl cellulose [trade name “ZRF80S” manufactured by Fuji Photo Film Co., Ltd.] was immersed in an aqueous solution in which sodium hydroxide was dissolved, The surface was subjected to an alkali treatment (also referred to as an acid treatment). The water contact angle of the polymer film at 23 ° C was 64.6 ° before treatment and 42.2 ° after treatment.
- an aqueous solution containing the above-mentioned lyotropic liquid crystal dichroic dye was applied to the surface of the polymer film treated with alkali at a coating speed of 1600 mmZ sec (wet thickness; 1 m) using a bar coater. And dried naturally to prepare a laminate A of a polarizing film having a single transmittance of 42.12% and a polymer film.
- Table 1 The evaluation results of the obtained laminate A are shown in Table 1.
- Example 2 In the same manner as in Example 1, it contains a dichroic dye of lyotropic liquid crystal, has an electric conductivity of 20 0.1 ⁇ S / cmCO.05% by weight), and the concentration of the dichroic dye is 12.
- An aqueous solution of 5% by weight was prepared.
- the surface of a 0.7 m-thick glass substrate [Glass Cord “1737” manufactured by Corning Co., Ltd.] was cleaned by ultrasonic treatment with acetone for 3 minutes and ion-exchanged water for 5 minutes. At this point, the water contact angle of the glass substrate at 23 ° C was 43.9 ° before treatment and 30.1 ° after treatment.
- the surface of the glass substrate subjected to ultrasonic treatment was further subjected to corona treatment (strength: 0.14 kW).
- the water contact angle of the glass substrate at 23 ° C was 30.1 ° before treatment and 14.2 ° after treatment.
- the corona-treated surface of the glass substrate is coated with an aqueous solution containing the dichroic dye of the lyotropic liquid crystal using a bar coater at a coating speed of 600 mmZ seconds (wet thickness; lwm). It was naturally dried to produce a laminate B of a polarizing film having a single transmittance of 50.20% and a glass substrate. Table 1 shows the evaluation results of the resulting laminate B.
- Example 3 In the same manner as in Example 1, it contains a dichroic dye of lyotropic liquid crystal, has an electric conductivity of 20 0.1 ⁇ S / cmCO. 05% by weight), and the concentration of the dichroic dye is 13. An aqueous solution of 0% by weight was prepared. Next, a polymer film (trade name “ZRF80S” manufactured by Fuji Photo Film Co., Ltd.) mainly composed of triacetylcellulose with a thickness of 80 / zm was subjected to alkali treatment in the same manner as in Example 1. did.
- a polymer film (trade name “ZRF80S” manufactured by Fuji Photo Film Co., Ltd.) mainly composed of triacetylcellulose with a thickness of 80 / zm was subjected to alkali treatment in the same manner as in Example 1. did.
- an aqueous solution containing the above-mentioned lyotropic liquid crystal dichroic dye is applied onto the surface of the polymer film treated with alkali at a coating speed of 1200 mmZ seconds using a bar coater (wet thickness; 1 m) and air-dried to produce a laminate C of a polarizing film having a single transmittance of 41.95% and a polymer film.
- Table 1 shows the evaluation results of the obtained layered product C.
- Example 1 Except that the aqueous solution containing the dichroic dye of the lyotropic liquid crystal was not purified and prepared so that the concentration of the dichroic dye was 13.0% by weight, the same method as in Example 1, A laminate H was produced. The electrical conductivity of the aqueous solution was 159.2 ⁇ 8 / ⁇ (converted to 0.05% by weight). Table 1 shows the evaluation results of the obtained laminate.
- a laminate I was produced in the same manner as in Example 1 except that the polymer film containing triacetyl cellulose as a main component was not subjected to alkali treatment.
- the water contact angle of the polymer film was 64.6 °. Table 1 shows the evaluation results of the obtained laminate I.
- a laminate J was produced in the same manner as in Example 1 except that the coating speed was 50 mmZ seconds. Table 1 shows the evaluation results of the obtained laminate J.
- Table 1 shows the dichroic ratio and thickness variation of the laminates including the polarizing films obtained in Examples 1 to 3 and Comparative Examples 1 to 3.
- the laminate including the polarizing films obtained in Examples 1 to 3 had a high dichroic ratio and a small standard deviation of the single transmittance.
- the standard deviation of the single transmittance has a correlation with the thickness variation, and the smaller the value, the smaller the thickness variation of the polarizing film.
- the laminate containing the polarizing film obtained in Comparative Examples 1 and 2 had a small dichroic ratio.
- the polarizing film obtained in Comparative Example 3 had a small dichroic ratio and a large standard deviation of single transmittance.
- a polarizing film having a high dichroic ratio can be manufactured, which is extremely useful for improving display characteristics of a liquid crystal display device, for example.
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mathematical Physics (AREA)
- Polarising Elements (AREA)
- Liquid Crystal (AREA)
Abstract
Description
Claims
Priority Applications (4)
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CN2007800001214A CN101310201B (zh) | 2006-04-27 | 2007-03-20 | 偏振片的制造方法以及液晶显示装置 |
EP07739050A EP1881351A4 (en) | 2006-04-27 | 2007-03-20 | PROCESS FOR PRODUCING POLARIZER FILM AND LIQUID CRYSTAL DISPLAY ELEMENT |
US11/913,826 US20090027597A1 (en) | 2006-04-27 | 2007-03-20 | Method for producing polarizing film, and liquid crystal display device |
US13/926,549 US20130280438A1 (en) | 2006-04-27 | 2013-06-25 | Method for producing polarizing film, and liquid crystal display device |
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JP2006-124244 | 2006-04-27 | ||
JP2006124244 | 2006-04-27 |
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US13/926,549 Division US20130280438A1 (en) | 2006-04-27 | 2013-06-25 | Method for producing polarizing film, and liquid crystal display device |
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WO2007125696A1 true WO2007125696A1 (ja) | 2007-11-08 |
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US (2) | US20090027597A1 (ja) |
EP (1) | EP1881351A4 (ja) |
KR (1) | KR100840049B1 (ja) |
CN (1) | CN101310201B (ja) |
TW (1) | TW200741265A (ja) |
WO (1) | WO2007125696A1 (ja) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2009066520A1 (ja) * | 2007-11-19 | 2009-05-28 | Nitto Denko Corporation | 偏光膜生成用コーティング液及び偏光膜 |
WO2009147872A1 (ja) * | 2008-06-06 | 2009-12-10 | 日東電工株式会社 | 耐水性有機薄膜の製造方法 |
JP2012027107A (ja) * | 2010-07-21 | 2012-02-09 | Hitachi Displays Ltd | 表示装置 |
US8821989B2 (en) | 2008-02-13 | 2014-09-02 | Nitto Denko Corporation | Method for manufacturing optical laminated body |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
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JP5153436B2 (ja) | 2008-02-13 | 2013-02-27 | 日東電工株式会社 | 耐水性偏光膜の製造方法 |
JP5320010B2 (ja) * | 2008-10-07 | 2013-10-23 | 三菱重工業株式会社 | 管寄せ管台の溶接構造 |
JP6347917B2 (ja) * | 2013-05-27 | 2018-06-27 | 株式会社ジャパンディスプレイ | 液晶表示装置およびその製造方法 |
JP6211488B2 (ja) * | 2014-08-25 | 2017-10-11 | 富士フイルム株式会社 | 液晶表示装置、および偏光板の製造方法 |
CN107463029B (zh) * | 2017-08-25 | 2020-11-24 | 深圳市华星光电技术有限公司 | 自取向液晶显示面板及其制作方法 |
JP2019070766A (ja) * | 2017-10-11 | 2019-05-09 | シャープ株式会社 | 液晶パネルの製造方法 |
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FR2606418B1 (fr) * | 1986-11-07 | 1994-02-11 | Commissariat A Energie Atomique | Dispositifs optiques a cristal liquide lyotrope commandables thermiquement, electriquement ou magnetiquement |
RU2047643C1 (ru) * | 1993-05-21 | 1995-11-10 | Хан Ир Гвон | Материал для поляризующих покрытий |
US6049428A (en) * | 1994-11-18 | 2000-04-11 | Optiva, Inc. | Dichroic light polarizers |
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WO1999031535A1 (fr) * | 1997-12-16 | 1999-06-24 | Gosudarstvenny Nauchny Tsentr Rossiiskoi Federatsii 'niopik' (Gnts Rf 'niopik') | Polariseur et element d'affichage a cristaux liquides |
US20020039628A1 (en) * | 1999-01-26 | 2002-04-04 | Kazufumi Ogawa | Liquid crystal alignment film, method of producing the same, liquid crystal display made by using the film, and method of producing the same |
RU2226285C2 (ru) * | 2000-07-11 | 2004-03-27 | ОПТИВА, Инк. | Устройство формирования поляризатора, устройство локального удаления материала пленки поляризатора и технологическая линия формирования поляризаторов |
US6488866B1 (en) * | 2000-11-08 | 2002-12-03 | 3M Innovative Properties Company | Liquid crystal materials and alignment structures and optical devices containing same |
JP2002215489A (ja) * | 2001-01-15 | 2002-08-02 | Toshi Koei Kk | インターネットの簡単接続・簡単終了システム |
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2007
- 2007-03-20 WO PCT/JP2007/055607 patent/WO2007125696A1/ja active Application Filing
- 2007-03-20 US US11/913,826 patent/US20090027597A1/en not_active Abandoned
- 2007-03-20 CN CN2007800001214A patent/CN101310201B/zh not_active Expired - Fee Related
- 2007-03-20 KR KR1020077017193A patent/KR100840049B1/ko active IP Right Grant
- 2007-03-20 EP EP07739050A patent/EP1881351A4/en not_active Withdrawn
- 2007-03-28 TW TW096110784A patent/TW200741265A/zh not_active IP Right Cessation
-
2013
- 2013-06-25 US US13/926,549 patent/US20130280438A1/en not_active Abandoned
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JP2001215489A (ja) * | 2000-01-31 | 2001-08-10 | Nitto Denko Corp | 多軸偏光子及び液晶表示装置 |
JP2002180052A (ja) * | 2000-12-14 | 2002-06-26 | Fuji Photo Film Co Ltd | 水溶性二色性色素、光学フイルム、偏光素子、二色性色素のミセルを配向させる方法および光学フイルムの製造方法 |
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Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009066520A1 (ja) * | 2007-11-19 | 2009-05-28 | Nitto Denko Corporation | 偏光膜生成用コーティング液及び偏光膜 |
KR101153767B1 (ko) * | 2007-11-19 | 2012-06-13 | 닛토덴코 가부시키가이샤 | 편광막 생성용 코팅액 및 편광막 |
US8257802B2 (en) | 2007-11-19 | 2012-09-04 | Nitto Denko Corporation | Coating liquid for forming polarizing film and polarizing film |
TWI384267B (zh) * | 2007-11-19 | 2013-02-01 | Nitto Denko Corp | And a polarizing film for forming a polarizing film |
US8821989B2 (en) | 2008-02-13 | 2014-09-02 | Nitto Denko Corporation | Method for manufacturing optical laminated body |
WO2009147872A1 (ja) * | 2008-06-06 | 2009-12-10 | 日東電工株式会社 | 耐水性有機薄膜の製造方法 |
JP2009292074A (ja) * | 2008-06-06 | 2009-12-17 | Nitto Denko Corp | 耐水性有機薄膜の製造方法 |
CN101932449A (zh) * | 2008-06-06 | 2010-12-29 | 日东电工株式会社 | 耐水性有机薄膜的制造方法 |
US20110070363A1 (en) * | 2008-06-06 | 2011-03-24 | Nitto Denko Corporation | Process for production of water-resistant organic thin film |
JP2012027107A (ja) * | 2010-07-21 | 2012-02-09 | Hitachi Displays Ltd | 表示装置 |
Also Published As
Publication number | Publication date |
---|---|
CN101310201B (zh) | 2013-05-29 |
TW200741265A (en) | 2007-11-01 |
EP1881351A4 (en) | 2012-04-11 |
US20130280438A1 (en) | 2013-10-24 |
CN101310201A (zh) | 2008-11-19 |
KR20080023671A (ko) | 2008-03-14 |
KR100840049B1 (ko) | 2008-06-19 |
TWI345644B (ja) | 2011-07-21 |
US20090027597A1 (en) | 2009-01-29 |
EP1881351A1 (en) | 2008-01-23 |
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