WO2022186029A1 - 偏光膜、偏光フィルム、画像表示パネル、及び画像表示装置 - Google Patents
偏光膜、偏光フィルム、画像表示パネル、及び画像表示装置 Download PDFInfo
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- WO2022186029A1 WO2022186029A1 PCT/JP2022/007520 JP2022007520W WO2022186029A1 WO 2022186029 A1 WO2022186029 A1 WO 2022186029A1 JP 2022007520 W JP2022007520 W JP 2022007520W WO 2022186029 A1 WO2022186029 A1 WO 2022186029A1
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- WIPO (PCT)
- Prior art keywords
- polarizing film
- film
- image display
- boric acid
- weight
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Links
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- C—CHEMISTRY; METALLURGY
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L85/00—Compositions of macromolecular compounds obtained by reactions forming a linkage in the main chain of the macromolecule containing atoms other than silicon, sulfur, nitrogen, oxygen and carbon; Compositions of derivatives of such polymers
- C08L85/04—Compositions of macromolecular compounds obtained by reactions forming a linkage in the main chain of the macromolecule containing atoms other than silicon, sulfur, nitrogen, oxygen and carbon; Compositions of derivatives of such polymers containing boron
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- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
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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
- 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
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/02—Details
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/80—Constructional details
- H10K59/8793—Arrangements for polarized light emission
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/80—Constructional details
- H10K59/8791—Arrangements for improving contrast, e.g. preventing reflection of ambient light
Definitions
- the present invention relates to a polarizing film, a polarizing film, an image display panel, and an image display device.
- polarizing films used in various image display devices such as liquid crystal display devices and organic EL display devices have both high transmittance and high degree of polarization.
- Polyvinyl alcohol-based films containing dichroic substances such as sexual dyes are used.
- the polarizing film is produced by subjecting a polyvinyl alcohol-based film to various treatments such as swelling, dyeing, cross-linking and stretching in a bath, followed by washing and drying.
- the polarizing film is used as a polarizing film by being laminated via a transparent protective film adhesive layer. Further, the polarizing film is optionally laminated with other optical layers to form a laminated polarizing film (optical laminate).
- the polarizing film or laminated polarizing film (optical laminate) is used as an image display panel bonded to an image display cell such as a liquid crystal cell or an organic EL element. Furthermore, the image display panel is bonded to a front transparent plate (window layer) on the viewing side or a front transparent member such as a touch panel via an adhesive layer or an adhesive layer, and used as the above various image display devices.
- Patent Document 2 describes that increasing the boron content in the polarizing film is effective in improving the durability of the optical properties of the polarizing film in a high-temperature environment.
- Patent Document 3 if the boric acid content of the polarizing film is simply increased, The polarizing film may easily absorb water contained in the water-based adhesive layer, resulting in re-swelling. Such re-swelling of the polarizing film causes defects (pattern traces) in the appearance of the rugged pattern that can be confirmed by reflection of light from a fluorescent lamp, resulting in a problem of poor appearance of the polarizing film.
- the polarizing film in which a transparent protective film with low moisture permeability and a polarizing film are laminated via a water-based adhesive layer, as in Patent Document 3, is also required to have durability under high temperature and high humidity.
- an object of the present invention is to provide a polarizing film capable of forming a polarizing film that has excellent durability in a high-temperature, high-humidity environment and that can prevent the occurrence of traces of patterns.
- the present invention provides a polarizing film in which a dichroic substance is adsorbed and oriented on a polyvinyl alcohol-based film and the orientation is fixed by boric acid cross-linking, and (A) the boric acid index calculated by the ATR method in FT-IR and (B) a polarizing film having a boric acid content (% by weight) ratio ((A)/(B)) calculated by a neutralization titration method of less than 0.13.
- the present invention also relates to a polarizing film in which a first transparent protective film and the polarizing film are laminated via a water-based adhesive layer.
- the present invention also relates to an image display panel in which the polarizing film is attached to an image display cell. Furthermore, the present invention relates to an image display device having the image display panel and a front transparent member.
- the polarizing film of the present invention is a polarizing film in which a dichroic substance is adsorbed and oriented on a polyvinyl alcohol-based film and the orientation is fixed by cross-linking with boric acid.
- the ratio ((A)/(B)) of the index and (B) the boric acid content (% by weight) calculated by the neutralization titration method is less than 0.13.
- the (A) boric acid index calculated by the ATR method in FT-IR indicates the amount of boric acid on the surface of the polarizing film (surface boric acid amount), and the (B) boric acid index calculated by the neutralization titration method.
- the acid content indicates the boric acid concentration (bulk boric acid concentration) of the entire polarizing film.
- the ratio of (A) to (B) ((A)/(B)) is less than 0.13, reswelling of the polarizing film due to moisture in the water-based adhesive layer is prevented. Since this hardly occurs, it is possible to form a polarizing film that is excellent in durability in a high-temperature and high-humidity environment and that can prevent the occurrence of pattern traces.
- a dichroic substance is adsorbed and oriented on a polyvinyl alcohol-based film, and the orientation is fixed by boric acid cross-linking, (A) the boric acid index calculated by the ATR method in FT-IR, The boric acid content (% by weight) ratio ((A)/(B)) calculated by the neutralization titration method is less than 0.13.
- the polarizing film is formed by adsorbing and aligning a dichroic substance such as iodine or a dichroic dye on a polyvinyl alcohol film.
- Dichroic dyes include acridine dyes, oxazine dyes, cyanine dyes, naphthalene dyes, azo dyes and anthraquinone dyes. From the viewpoint of the initial polarizing performance of the polarizing film, an iodine-based polarizing film containing iodine as the dichroic substance is preferable.
- the polyvinyl alcohol (PVA)-based film has translucency in the visible light region, and can be used without particular limitation if it disperses and adsorbs dichroic substances such as iodine and dichroic dyes.
- the material for the polyvinyl alcohol-based film include polyvinyl alcohol and its derivatives.
- Derivatives of polyvinyl alcohol include, for example, polyvinyl formal and polyvinyl acetal; olefins such as ethylene and propylene; unsaturated carboxylic acids such as acrylic acid, methacrylic acid and crotonic acid, and those modified with alkyl esters thereof, acrylamide and the like; is mentioned.
- the polyvinyl alcohol preferably has an average degree of polymerization of about 100 to 10,000, more preferably about 1,000 to 10,000, even more preferably about 1,500 to 4,500. .
- the polyvinyl alcohol preferably has a degree of saponification of about 80 to 100 mol %, more preferably about 95 mol % to 99.95 mol.
- the average degree of polymerization and the degree of saponification can be determined according to JIS K 6726.
- the polarizing film has a ratio ((A)/( B)) is less than 0.13.
- the boric acid index calculated by the ATR method in FT-IR is calculated by attenuated total reflection spectroscopy (ATR) measurement using a Fourier transform infrared spectrophotometer (FT-IR), and the polarizing film surface boric acid content (surface boric acid content).
- ATR attenuated total reflection spectroscopy
- FT-IR Fourier transform infrared spectrophotometer
- surface boric acid content surface boric acid content
- International Publication No. 2017/145607 serves as a reference for such a method for measuring the amount of boric acid on the surface of the polarizing film.
- the boric acid index calculated by the ATR method in FT-IR is preferably 2.00 or more, more preferably 2.22 or more, from the viewpoint of improving durability. It is more preferably 91 or more, and preferably 3.46 or less from the viewpoint of preventing the occurrence of pattern traces.
- the boric acid content (% by weight) calculated by the (B) neutralization titration method indicates the boric acid concentration (bulk boric acid concentration) of the entire polarizing film.
- the boric acid content (% by weight) calculated by the (B) neutralization titration method is preferably 20% by weight or more, more preferably 22% by weight or more, from the viewpoint of improving durability. , more preferably 24% by weight or more, and from the viewpoint of the dimensional change rate (shrinkage rate), it is preferably 35% by weight or less, more preferably 32% by weight or less, and 30% by weight or less. is more preferable.
- the polarizing film has a ratio ((A)/( B)) is preferably 0.06 or more, more preferably 0.074 or more, from the viewpoint of improving transportability (preventing folding in the bath), and generating traces of patterns. From the viewpoint of preventing this, it is preferably 0.122 or less.
- the polarizing film is obtained by subjecting the polyvinyl alcohol-based film to a dyeing step, a cross-linking step, and a stretching step, and optionally at least one treatment step of a swelling step, a washing step, and a drying step. obtained by The content of boron contained in the polarizing film is the amount of boron contained in any one of the treatment baths in the swelling step, dyeing step, cross-linking step, stretching step, and washing step. It can be controlled by the concentration of the boron component-donating substance such as a compound, and the treatment temperature and treatment time in each of the above treatment baths.
- the cross-linking step and the stretching step it is easy to adjust the boron content within a desired range by adjusting the processing conditions such as the concentration of the boron component-donating substance.
- the processing conditions such as the boron component-donating substance used in the dyeing step, the crosslinking step, or the stretching step, the boron can be eluted from the polyvinyl alcohol film. content can be easily adjusted to the desired range.
- the swelling step is a treatment step in which the polyvinyl alcohol film is immersed in a swelling bath, which can remove stains, blocking agents, etc. on the surface of the polyvinyl alcohol film, and can be dyed by swelling the polyvinyl alcohol film. Unevenness can be suppressed.
- a medium containing water as a main component such as water, distilled water, or pure water, is usually used. Surfactants, alcohols and the like may be appropriately added to the swelling bath according to conventional methods. Potassium iodide may also be used in the swelling bath. In this case, the concentration of potassium iodide in the swelling bath is preferably 1.5% by weight or less, preferably 1.0% by weight or less. more preferably 0.5% by weight or less.
- the temperature of the swelling bath is preferably about 10 to 60°C, more preferably about 15 to 45°C, even more preferably about 18 to 30°C.
- the immersion time in the swelling bath cannot be unconditionally determined because the degree of swelling of the polyvinyl alcohol film is affected by the temperature of the swelling bath, but it is preferably about 5 to 300 seconds, more preferably 10 to 200 seconds. About 20 to 100 seconds is more preferable.
- the swelling step may be performed only once, or may be performed multiple times as necessary.
- the dyeing step is a treatment step in which the polyvinyl alcohol film is immersed in a dyeing bath (iodine solution), and the polyvinyl alcohol film can be adsorbed and oriented with a dichroic substance such as iodine or a dichroic dye.
- iodine solution is usually preferably an aqueous iodine solution containing iodine and iodide as a dissolution aid.
- iodides examples include potassium iodide, lithium iodide, sodium iodide, zinc iodide, aluminum iodide, lead iodide, copper iodide, barium iodide, calcium iodide, tin iodide, and iodide. Titanium etc. are mentioned.
- the concentration of iodine in the dye bath is preferably about 0.01 to 1% by weight, more preferably about 0.02 to 0.5% by weight.
- the concentration of the iodide in the dyeing bath is preferably about 0.01 to 10% by weight, more preferably about 0.05 to 5% by weight, and about 0.1 to 3% by weight. It is even more preferable to have
- the temperature of the dyeing bath is preferably about 10 to 50°C, more preferably about 15 to 45°C, even more preferably about 18 to 30°C.
- the immersion time in the dyeing bath cannot be determined unconditionally because the degree of dyeing of the polyvinyl alcohol film is affected by the temperature of the dyeing bath, but it is preferably about 10 to 300 seconds, and 20 to 240 seconds. It is more preferable to be a degree.
- the dyeing step may be performed only once, or may be performed multiple times as necessary.
- the cross-linking step is a treatment step of immersing the polyvinyl alcohol-based film dyed in the dyeing step in a treatment bath (cross-linking bath) containing a boron compound, and the polyvinyl alcohol-based film is cross-linked by the boron compound, Iodine molecules or dye molecules can be adsorbed on the crosslinked structure.
- a treatment bath cross-linking bath
- the boron compound include boric acid, borates, and borax.
- the cross-linking bath is generally an aqueous solution, but may be, for example, a mixed solution of an organic solvent miscible with water and water.
- the cross-linking bath preferably contains potassium iodide.
- the concentration of the boron compound in the crosslinking bath is preferably about 1 to 15% by weight, more preferably about 1.5 to 10% by weight, more preferably about 2 to 5% by weight. preferable. Further, when potassium iodide is used in the cross-linking bath, the concentration of potassium iodide in the cross-linking bath is preferably about 1 to 15% by weight, more preferably about 1.5 to 10% by weight. More preferably, it is about 2 to 5% by weight.
- the temperature of the cross-linking bath is preferably about 20-70°C, more preferably about 30-60°C.
- the immersion time in the cross-linking bath cannot be unconditionally determined because the degree of cross-linking of the polyvinyl alcohol film is affected by the temperature of the cross-linking bath, but it is preferably about 5 to 300 seconds, more preferably 10 to 200 seconds. It is more preferable to be a degree.
- the cross-linking step may be performed only once, or may be performed multiple times as necessary.
- the stretching step is a treatment step of stretching the polyvinyl alcohol film in at least one direction to a predetermined magnification.
- a polyvinyl alcohol film is uniaxially stretched in the transport direction (longitudinal direction).
- the stretching method is not particularly limited, and either a wet stretching method or a dry stretching method can be employed.
- the stretching step may be performed only once, or may be performed multiple times as necessary.
- the stretching step may be performed at any stage in the production of the polarizing film.
- the treatment bath (stretching bath) in the wet stretching method can usually use a solvent such as water or a mixed solution of an organic solvent miscible with water and water.
- the drawing bath preferably contains potassium iodide.
- the concentration of potassium iodide in the drawing bath is preferably about 1 to 15% by weight, more preferably about 2 to 10% by weight. More preferably, it is about 6% by weight.
- the treatment bath (stretching bath) may contain the boron compound from the viewpoint of suppressing film breakage during stretching. In this case, the concentration of the boron compound in the stretching bath is 1 to 15. It is preferably about weight %, more preferably about 1.5 to 10 weight %, and more preferably about 2 to 5 weight %.
- the temperature of the stretching bath is preferably about 25 to 80°C, more preferably about 40 to 75°C, even more preferably about 50 to 70°C.
- the immersion time in the stretching bath cannot be unconditionally determined because the degree of stretching of the polyvinyl alcohol film is affected by the temperature of the stretching bath, but it is preferably about 10 to 800 seconds, more preferably 30 to 500 seconds. It is more preferable to be a degree.
- the stretching treatment in the wet stretching method may be performed together with any one or more of the swelling step, the dyeing step, the cross-linking step, and the washing step.
- Examples of the dry drawing method include a roll-to-roll drawing method, a heating roll drawing method, a compression drawing method, and the like.
- the dry stretching method may be applied together with the drying step.
- the total draw ratio (cumulative draw ratio) applied to the polyvinyl alcohol film can be appropriately set according to the purpose, but it is preferably about 2 to 7 times, and about 3 to 6.8 times. More preferably, it is even more preferably about 3.5 to 6.5 times.
- the washing process is a treatment process in which the polyvinyl alcohol film is immersed in a washing bath, and foreign matter remaining on the surface of the polyvinyl alcohol film can be removed.
- a medium containing water as a main component such as water, distilled water, or pure water, is usually used.
- potassium iodide in the cleaning bath.
- the concentration of potassium iodide in the cleaning bath is preferably about 1 to 10% by weight, preferably 1.5 to 4% by weight. About 1.8 to 3.8% by weight is more preferable.
- the temperature of the cleaning bath is preferably about 5 to 50°C, more preferably about 10 to 40°C, even more preferably about 20 to 36°C.
- the immersion time in the cleaning bath cannot be unconditionally determined because the degree of cleaning of the polyvinyl alcohol film is affected by the temperature of the cleaning bath, but it is preferably about 1 to 100 seconds, more preferably 2 to 50 seconds. About 3 to 20 seconds is more preferable.
- the swelling step may be performed only once, or may be performed multiple times as necessary.
- the cleaning step is not particularly limited as long as foreign matter remaining on the surface of the polyvinyl alcohol film can be removed, and for example, the above medium may be applied (coated) for cleaning.
- coating (coating) methods include roll coating, spin coating, wire bar coating, dip coating, die coating, curtain coating, spray coating, knife coating (comma coating, etc.), and the like. coating method and the like.
- the washing step may be performed only once, or may be performed multiple times as necessary.
- the drying step is a step of drying the polyvinyl alcohol-based film washed in the washing step to obtain a polarizing film, and a polarizing film having a desired moisture content is obtained by drying.
- the drying is performed by any appropriate method, and examples thereof include natural drying, air drying, and heat drying.
- the polarizing film preferably has a moisture content of about 8 to 25% by weight, more preferably about 12 to 20% by weight.
- the drying temperature is preferably about 20 to 150°C, more preferably about 25 to 100°C.
- the drying time cannot be unconditionally determined because the degree of drying of the polarizing film is affected by the drying temperature, but it is preferably about 30 to 600 seconds, more preferably about 60 to 300 seconds. preferable.
- the drying step may be performed only once, or may be performed multiple times as necessary.
- the thickness of the polarizing film is preferably 1 ⁇ m or more, more preferably 2 ⁇ m or more, from the viewpoint of improving the initial degree of polarization of the polarizing film, and 20 ⁇ m or less from the viewpoint of preventing panel warpage. is preferably In particular, in order to obtain a polarizing film having a thickness of about 8 ⁇ m or less, a laminate containing a polyvinyl alcohol-based resin layer formed on a thermoplastic resin substrate is used as the polyvinyl alcohol-based film, and the following thin film is used. A method for manufacturing a polarizing film can be applied.
- a polarizing film is obtained by a conventional method for manufacturing a polarizing film.
- the content of the boron contained in the thin polarizing film is the boric acid contained in any one of the treatment baths in the insolubilization treatment step, the cross-linking treatment step, the washing treatment step, the dyeing treatment step, and the underwater stretching treatment step. It can be controlled by the concentration of a boron component-providing substance such as a boron compound such as borate and borax, and the treatment temperature and treatment time in each of the above treatment baths.
- the first transparent protective film and the polarizing film are laminated via a water-based adhesive layer.
- the first transparent protective film is not particularly limited as long as it is a transparent protective film used in a polarizing film, but when the first transparent protective film side of the polarizing film is laminated to the image display cell, From the viewpoint of production efficiency in the subsequent drying step, the moisture permeability is preferably 50 g/(m 2 ⁇ 24 h) or less, more preferably 30 g/(m 2 ⁇ 24 h) or less, and 15 g/ (m 2 ⁇ 24h) or less is more preferable. Also, a second transparent protective film may be attached to the opposite side of the first transparent protective film of the polarizing film.
- the moisture permeability is preferably 1000 g/(m 2 ⁇ 24 h) or less, more preferably 800 g/(m 2 ⁇ 24 h) or less, and 600 g/(m 2 ⁇ 24 h) or less. is more preferred.
- Moisture permeability was measured according to the moisture permeability test (cup method) of JIS Z0208, a sample cut to 60 mm in diameter was placed in a moisture permeable cup containing about 15 g of calcium chloride, and subjected to a temperature of 40°C and a humidity of 90% RH. H. It can be calculated by measuring the weight increase of calcium chloride before and after it is placed in a constant temperature machine and left for 24 hours.
- Materials for the first and second transparent protective films are not particularly limited, and for example, organic substrates such as transparent protective films and retardation films used in polarizing films can be used.
- Examples of materials constituting the first and second transparent protective films include cellulose ester-based resins, polycarbonate-based resins, (meth)acrylic-based resins, cyclic polyolefin-based resins, and polyester-based resins.
- Examples of the retardation film include a birefringent film obtained by uniaxially or biaxially stretching a polymer material, an oriented film of a liquid crystal polymer, and a film in which an oriented layer of a liquid crystal polymer is supported.
- polarizing film other layers such as a hard coat layer, an anti-sticking layer, a diffusion layer or an anti-glare layer can be provided on the surfaces of the first and second transparent protective films to which the polarizing films are not attached.
- the above other layer can be provided on the protective film itself, or can be provided separately from the protective film.
- the thickness of the first and second transparent protective films can be determined as appropriate, but in general, it is preferably about 1 to 500 ⁇ m from the viewpoint of strength, workability such as handleability, and thinness. , about 1 to 300 ⁇ m, more preferably about 5 to 100 ⁇ m.
- the first and second transparent protective films may contain any suitable agents such as ultraviolet absorbers, antioxidants, lubricants, plasticizers, release agents, anti-coloring agents, flame retardants, antistatic agents, pigments, colorants, and the like. may contain additives.
- Water-based adhesive layer As the adhesive that forms the water-based adhesive layer, various water-based adhesives used in polarizing films can be applied. and water-based polyesters. Among these, polyvinyl alcohol-based adhesives are preferable, and acetoacetyl group-containing polyvinyl alcohol-based adhesives are more preferable.
- the water-based adhesive may contain a cross-linking agent.
- a cross-linking agent a compound having at least two functional groups in one molecule that are reactive with components such as polymers constituting the adhesive is usually used. Examples include alkylenediamines; isocyanates; epoxies; Aldehydes: amino-formaldehydes such as methylol urea and methylol melamine.
- the amount of the cross-linking agent compounded in the adhesive is usually about 10 to 60 parts by weight per 100 parts by weight of the component such as the polymer constituting the adhesive.
- an adhesive When bonding the second transparent protective film to the polarizing film, an adhesive is usually used.
- the adhesive include the water-based adhesive described above, an ultraviolet curable adhesive, an electron beam curable adhesive, and the like. Also, the adhesive may contain a metallic compound filler or the like.
- the adhesive such as the water-based adhesive may be applied to either the first and second transparent protective films or the polarizing film, or both. After lamination, a drying process is performed to form an adhesive layer consisting of a coated dry layer. The bonding of the polarizing film and the transparent protective film can be performed using a roll laminator or the like. After the drying step, ultraviolet rays or electron beams can be applied, if necessary.
- the thickness of the adhesive layer is not particularly limited, it is preferably about 30 to 5000 nm, more preferably about 100 to 1000 nm.
- the first and second transparent protective films and the polarizing film may be laminated via an intervening layer such as a surface modification treatment layer, an easy adhesive layer, a blocking layer, or a refractive index adjusting layer.
- an intervening layer such as a surface modification treatment layer, an easy adhesive layer, a blocking layer, or a refractive index adjusting layer.
- Examples of the surface modification treatment for forming the surface modification layer include corona treatment, plasma treatment, primer treatment, and saponification treatment.
- Examples of the easy-adhesive agent that forms the easy-adhesion layer include forming materials containing various resins having a polyester skeleton, a polyether skeleton, a polycarbonate skeleton, a polyurethane skeleton, a silicone system, a polyamide skeleton, a polyimide skeleton, a polyvinyl alcohol skeleton, and the like. mentioned.
- the easy-adhesion layer is usually provided in advance on a protective film, and the easy-adhesion layer side of the protective film and the polarizing film are laminated by the pressure-sensitive adhesive layer or the adhesive layer.
- the blocking layer is a layer that functions to prevent impurities such as oligomers and ions eluted from transparent protective films and the like from migrating (intruding) into the polarizing film.
- the block layer may be any layer as long as it has transparency and can prevent impurities eluted from a transparent protective film or the like. Examples of materials for forming the block layer include urethane prepolymer-based forming materials and cyanoacrylate. Examples include system-forming materials, epoxy-based forming materials, and the like.
- the refractive index adjusting layer is a layer provided to suppress a decrease in transmittance due to reflection between layers having different refractive indices such as the transparent protective film and the polarizing film.
- the refractive index adjusting material for forming the refractive index adjusting layer include forming agents containing various resins such as silica-based, acrylic-based, acrylic-styrene-based, and melamine-based resins and additives.
- the polarizing film may be a laminated polarizing film (optical laminate) in which the polarizing film is bonded to an optical layer.
- the optical layer is not particularly limited, for example, formation of a liquid crystal display such as a reflector, a semi-transmissive plate, a retardation plate (including a 1/2 or 1/4 wavelength plate), a viewing angle compensation film, etc.
- One or two or more optical layers may be used.
- the laminated polarizing film in particular, a reflective polarizing film or a semi-transmissive polarizing film obtained by laminating a reflector or a semi-transmitting reflector on the polarizing film, and a retardation plate further laminated on the polarizing film.
- an image display cell such as a liquid crystal cell or an organic EL element
- a front transparent member such as a front transparent plate or a touch panel on the viewing side.
- An adhesive layer may be added for bonding the members together.
- a pressure-sensitive adhesive layer is suitable as the adhesive layer.
- the pressure-sensitive adhesive that forms the pressure-sensitive adhesive layer is not particularly limited. They can be appropriately selected and used. In particular, a pressure-sensitive adhesive containing an acrylic polymer, which is excellent in optical transparency, exhibits appropriate wettability, cohesiveness and adhesiveness, and is excellent in weather resistance, heat resistance, etc., is preferably used.
- An appropriate method can be used to attach an adhesive layer to one side or both sides of the polarizing film or the laminated polarizing film.
- a method of preparing an adhesive solution and directly attaching it on the polarizing film or the laminated polarizing film by an appropriate development method such as a casting method or a coating method, or a separator Examples include a method of forming an adhesive layer thereon and transferring it onto the polarizing film or the laminated polarizing film.
- the thickness of the pressure-sensitive adhesive layer can be appropriately determined according to the purpose of use, adhesive strength, etc., and is generally 1 to 500 ⁇ m, preferably 5 to 200 ⁇ m, more preferably 10 to 100 ⁇ m.
- Such a polarizing film or laminated polarizing film provided with an adhesive layer on at least one surface is referred to as a polarizing film with an adhesive layer or a laminated polarizing film with an adhesive layer.
- the exposed surface of the pressure-sensitive adhesive layer is preferably temporarily covered with a separator for the purpose of preventing contamination, etc., until it is put into practical use.
- a separator for the purpose of preventing contamination, etc., until it is put into practical use.
- contamination of the pressure-sensitive adhesive layer, etc. can be prevented under normal handling conditions.
- the separator include suitable thin sheets such as plastic films, rubber sheets, paper, cloth, nonwoven fabric, nets, foam sheets, metal foils, and laminates thereof.
- a film coated with an appropriate release agent such as fluorine-based or molybdenum sulfide is used.
- the first transparent protective film side of the polarizing film is attached to the image display cell.
- the image display cell include a liquid crystal cell and an organic EL cell.
- the liquid crystal cell include a reflective liquid crystal cell that uses external light, a transmissive liquid crystal cell that uses light from a light source such as a backlight, and a semi-transmissive liquid crystal cell that uses both external light and light from a light source. Any semi-reflective liquid crystal cell may be used.
- the image display device liquid crystal display device
- the image display device has a polarizing film disposed on the opposite side of the image display cell (liquid crystal cell) from the viewing side, and the light source is placed.
- the polarizing film on the light source side and the liquid crystal cell are preferably bonded together via an appropriate adhesive layer.
- any type such as VA mode, IPS mode, TN mode, STN mode, or bend orientation ( ⁇ type) can be used.
- a light-emitting body organic electroluminescence light-emitting body formed by laminating a transparent electrode, an organic light-emitting layer and a metal electrode on a transparent substrate in this order is preferably used.
- the organic light-emitting layer is a laminate of various organic thin films. and a laminate of an electron injection layer made of a perylene derivative or the like, or a laminate of a hole injection layer, a light emitting layer, and an electron injection layer.
- An image display device of the present invention has the image display panel and a front transparent member.
- the image display panel usually includes a front transparent member on the second transparent protective film side of the image display panel.
- Examples of the front transparent member arranged on the viewing side of the image display cell include a front transparent plate (window layer) and a touch panel.
- a transparent plate having appropriate mechanical strength and thickness is used as the front transparent plate.
- a transparent plate for example, a transparent resin plate such as acrylic resin or polycarbonate resin, or a glass plate is used.
- the touch panel for example, various types of touch panels such as resistive type, capacitive type, optical type, ultrasonic type, etc., and glass plates and transparent resin plates having a touch sensor function are used.
- a capacitive touch panel is used as the front transparent member, it is preferable that a front transparent plate made of glass or a transparent resin plate is provided on the viewing side of the touch panel.
- the polarizing film of the present invention is excellent in durability in a high-temperature and high-humidity environment. Therefore, it can be used not only for flat panel display applications and mobile applications, but also for in-vehicle display applications and outdoor use such as signage. It can be preferably used in the intended display application.
- Example 1> ⁇ Preparation of polarizing film> A polyvinyl alcohol film having an average degree of polymerization of 2,400, a degree of saponification of 99.9 mol % and a thickness of 45 ⁇ m was prepared. A polyvinyl alcohol film is immersed in a swelling bath (water bath) at 30° C. for 30 seconds between rolls having different peripheral speed ratios, and stretched by 2.2 times in the conveying direction while swelling (swelling step).
- a swelling bath water bath
- the polarizing film was adjusted to a predetermined transmittance. It was immersed for 30 seconds while adjusting the iodine concentration and stretched 3.3 times in the transport direction based on the original polyvinyl alcohol film (polyvinyl alcohol film not stretched at all in the transport direction) while dyeing (dyeing process). . Then, the dyed polyvinyl alcohol film is placed in a 40° C.
- crosslinking bath an aqueous solution with a boric acid concentration of 3.5% by weight, a potassium iodide concentration of 3.0% by weight, and a zinc sulfate concentration of 3.6% by weight.
- crosslinking step for 28 seconds and stretched up to 3.6 times in the conveying direction with respect to the original polyvinyl alcohol film (crosslinking step).
- the obtained polyvinyl alcohol film was placed in a drawing bath (an aqueous solution having a boric acid concentration of 4.8% by weight, a potassium iodide concentration of 5.0% by weight, and a zinc sulfate concentration of 5.0% by weight) at 64°C.
- ⁇ Preparation of polarizing film> polyvinyl alcohol resin containing an acetoacetyl group (average degree of polymerization: 1,200, degree of saponification: 98.5 mol%, degree of acetoacetylation: 5 mol%) and methylol melamine at a weight ratio of 3: The aqueous solution contained in 1 was used.
- a cycloolefin film (having a moisture permeability of 10 g/(m 2 24 h ), manufactured by Nippon Shokubai Co., Ltd., trade name "ZT film”) (hereinafter, this film is referred to as "transparent film A”), and as a second transparent protective film, triacetyl cellulose is added to the other side (viewing side).
- a 48 ⁇ m-thick transparent protective film water vapor transmission rate: 300 g/(m 2 24 h) called “transparent film B”) formed by forming HC on a film (manufactured by Fujifilm, product name “TJ40UL”) was pasted with a roll bonding machine. After combining, they were subsequently dried by heating in an oven (temperature: 90°C, time: 10 minutes) to prepare a polarizing film in which transparent protective films were laminated on both sides of the polarizing film.
- Level classification was carried out by visual appearance inspection (relative evaluation using level sample, sensory evaluation). If it is level 1 or 2, it can be practically used, and level 1 is more preferable.
- Level 1 Unevenness is not visually recognized in the polarizing film state.
- Level 2 Unevenness is visually recognized in the polarizing film state, but not visually recognized in the pseudo panel (glass) bonded state.
- Level 3 Concavities and convexities are visually recognized in a pseudo panel (glass) bonded state.
- an acrylic polymer solution having a weight average molecular weight (Mw) of 1,800,000.
- Mw weight average molecular weight
- 0.02 parts of an isocyanate cross-linking agent manufactured by Tosoh Corporation, trade name "Takenate D110N", trimethylolpropane/xylylene diisocyanate adduct
- silane 0.2 parts of a coupling agent manufactured by Shin-Etsu Chemical Co., Ltd., trade name “X-41-1056” was added to prepare a solution of an acrylic pressure-sensitive adhesive composition.
- ⁇ Preparation of polarizing film with adhesive> The solution of the acrylic pressure-sensitive adhesive composition obtained above was applied to one side of a polyethylene terephthalate film (Mitsubishi Chemical Polyester Film Co., Ltd., product name "MRF38", separator film) treated with a silicone release agent.
- the adhesive layer was applied to a thickness of 20 ⁇ m and dried at 90° C. for 1 minute to form an adhesive layer on the surface of the separator film.
- the pressure-sensitive adhesive layer formed on the separator film was transferred to the protective film surface on the image display cell side of the polarizing film prepared above to prepare a polarizing film with a pressure-sensitive adhesive layer.
- the polarizing film with the pressure-sensitive adhesive layer obtained above was cut into a size of 40 ⁇ 40 mm so that the absorption axis of the polarizing film was parallel to the long side, and the pressure-sensitive adhesive layer was interposed on a glass plate (50 ⁇ 45 mm, 1.1 mm thick), and autoclaved at 50° C. and 0.5 MPa for 15 minutes to prepare a pseudo image display panel (laminate having a polarizing film with a single-sided pressure-sensitive adhesive layer).
- the pseudo image display panel obtained above was subjected to an endurance test at a temperature of 85° C. and a relative humidity of 85% for 240 hours.
- the degree of polarization ( ⁇ P) was measured before and after the addition (humidification).
- the degree of polarization was measured using a spectrophotometer (LPF-200, manufactured by Otsuka Electronics Co., Ltd.).
- the degree of polarization ( ⁇ P) is preferably ⁇ 0.01 to ⁇ 0.03, more preferably 0 to ⁇ 0.01.
- the measurement wavelength is 380 to 780 nm (every 5 nm). Table 1 shows the results.
- Examples 2-7, 9> A pseudo image display panel was produced in the same manner as in Example 1, except that the concentration of boric acid in the stretching bath and the temperature of the washing bath were changed as shown in Table 1 in the preparation of the polarizing film.
- Example 8> In the preparation of the polarizing film, a second washing step was added between the washing bath step and the drying step of the polarizer, in which the polarizer was brought into contact with the gravure roll supplied with warm water of about 40°C. , and the temperature of the cleaning bath were changed as shown in Table 1, a pseudo image display panel was produced by the same operation as in Example 1.
- Example 1-2 A pseudo image display panel was produced in the same manner as in Example 1, except that the concentration of boric acid in the stretching bath and the temperature of the washing bath were changed as shown in Table 1 in the preparation of the polarizing film.
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Abstract
Description
本発明の偏光膜は、ポリビニルアルコール系フィルムに二色性物質が吸着配向し、ホウ酸架橋により配向固定され、(A)FT-IRにおけるATR法で算出されるホウ酸指数と、(B)中和滴定法により算出されるホウ酸含有量(重量%)の比((A)/(B))が、0.13未満である。
前記偏光膜は、前記ポリビニルアルコール系フィルムに、染色工程、架橋工程、および延伸工程が施され、また、任意の工程として、膨潤工程、洗浄工程、および乾燥工程の少なくとも1つの処理工程が施されることにより得られる。前記偏光膜中に含まれる前記ホウ素の含有量は、膨潤工程、染色工程、架橋工程、延伸工程および洗浄工程における各処理浴のいずれかに含まれるホウ酸、ホウ酸塩、ホウ砂等のホウ素化合物等のホウ素成分供与物質の濃度、上記の各処理浴による処理温度および処理時間によって制御できる。とくに、架橋工程および延伸工程は、ホウ素成分供与物質の濃度等の処理条件により、前記ホウ素の含有量の含有量を所望の範囲に調整し易い。また、洗浄工程は、染色工程、架橋工程、または延伸工程等で使用したホウ素成分供与物質等の処理条件を考慮したうえで、ホウ素をポリビニルアルコール系フィルムから溶出させることができる観点から、前記ホウ素の含有量を所望の範囲に調整し易い。
本発明の偏光フィルムは、第1の透明保護フィルムと前記偏光膜が、水系接着剤層を介して貼り合わされている。
前記第1の透明保護フィルムは、偏光フィルムに用いられている透明保護フィルムであれば特に制限ないが、前記偏光フィルムの第1の透明保護フィルム側を画像表示セルに貼り合わせる場合、貼り合わせた後の乾燥工程の生産効率の観点から、透湿度が50g/(m2・24h)以下であることが好ましく、透湿度が30g/(m2・24h)以下であることがより好ましく、15g/(m2・24h)以下であることがさらに好ましい。また、前記偏光フィルムの第1の透明保護フィルムの反対面に第2の透明保護フィルムを貼り合わせてもよく、この場合、第2の透明保護フィルムは、前偏光膜の高温高湿下の耐久性の観点から、透湿度が1000g/(m2・24h)以下であることが好ましく、800g/(m2・24h)以下であることがより好ましく、600g/(m2・24h)以下であることがさらに好ましい。透湿度は、JIS Z0208の透湿度試験(カップ法)に準じ、直径60mmに切断したサンプルを約15gの塩化カルシウムを入れた透湿カップにセットし、温度40℃、湿度90%R.H.の恒温機に入れ、24時間放置した前後の塩化カルシウムの重量増加を測定することで算出できる。
前記水系接着剤層を形成する接着剤としては、偏光フィルムに用いられている各種の水系接着剤を適用でき、例えば、イソシアネート系接着剤、ポリビニルアルコール系接着剤、ゼラチン系接着剤、ビニル系ラテックス系、水系ポリエステル等が挙げられる。これらの中でも、ポリビニルアルコール系接着剤が好ましく、アセトアセチル基含有ポリビニルアルコール系接着剤がより好ましい。
本発明の画像表示パネルは、画像表示セルに、前記偏光フィルムの第1の透明保護フィルム側が貼り合わされている。前記画像表示セルとしては、例えば、液晶セルや有機ELセル等が挙げられる。前記液晶セルとしては、例えば、外光を利用する反射型液晶セル、バックライト等の光源からの光を利用する透過型液晶セル、外部からの光と光源からの光の両者を利用する半透過半反射型液晶セルのいずれを用いてもよい。前記液晶セルが光源からの光を利用するものである場合、画像表示装置(液晶表示装置)は、画像表示セル(液晶セル)の視認側と反対側にも偏光フィルムが配置され、さらに光源が配置される。当該光源側の偏光フィルムと液晶セルとは、適宜の接着剤層を介して貼り合せられていることが好ましい。前記液晶セルの駆動方式としては、例えば、VAモード、IPSモード、TNモード、STNモードやベンド配向(π型)等の任意なタイプのものを用いうる。
本発明の画像表示装置は、前記画像表示パネルと、前面透明部材を有する。前記画像表示パネルは、通常、前記画像表示パネルの前記第2の透明保護フィルム側に、前面透明部材を備える。
<偏光膜の作製>
平均重合度が2,400、ケン化度が99.9モル%、厚みが45μmであるポリビニルアルコールフィルムを用意した。ポリビニルアルコールフィルムを、周速比の異なるロール間で、30℃の膨潤浴(水浴)中に30秒間浸漬して膨潤しながら搬送方向に2.2倍に延伸し(膨潤工程)、続いて、30℃の染色浴(水100重量部に対して、ヨウ素とヨウ化カリウムを1:7の重量比で配合して得られたヨウ素水溶液)中で、偏光膜が所定の透過率になるようにヨウ素濃度を調整しながら30秒間浸漬して染色しながら元のポリビニルアルコールフィルム(搬送方向に全く延伸していないポリビニルアルコールフィルム)を基準にして搬送方向に3.3倍に延伸した(染色工程)。次いで、染色したポリビニルアルコールフィルムを、40℃の架橋浴(ホウ酸濃度が3.5重量%、ヨウ化カリウム濃度が3.0重量%、硫酸亜鉛濃度が3.6重量%である水溶液)中で28秒間浸漬して元のポリビニルアルコールフィルムを基準にして搬送方向に3.6倍まで延伸した(架橋工程)。さらに、得られたポリビニルアルコールフィルムを、64℃の延伸浴(ホウ酸濃度が4.8重量%、ヨウ化カリウム濃度が5.0重量%、硫酸亜鉛濃度5.0重量%である水溶液)中で60秒間浸漬して元のポリビニルアルコールフィルムを基準にして搬送方向に6.0倍まで延伸した(延伸工程)後、29℃の洗浄浴(ヨウ化カリウム濃度が2.3重量%)中で10秒間浸漬した(洗浄工程)。洗浄したポリビニルアルコールフィルムを、40℃で30秒間乾燥して偏光膜を作製した。以下の測定方法にて求めた、(A)FT-IRにおけるATR法で算出されるホウ酸指数は3.20、(B)中和滴定法により算出されるホウ酸含有量(重量%)は27.5重量%であった。また、偏光膜の厚みは18μmであった。
上記で得られた偏光膜を用い、フーリエ変換赤外分光光度計(FT-IR)(Perkin Elmer社製、商品名「SPECTRUM2000」)にて、全反射減衰分光(ATR)測定によりホウ酸ピーク(665cm-1)の強度および参照ピーク(2940cm-1)の強度を測定した。得られたホウ酸ピーク強度および参照ピーク強度からホウ酸指数を下記式により算出した。
(ホウ酸指数)=(ホウ酸ピーク665cm-1の強度)/(参照ピーク2940cm-1の強度)
120℃で2時間乾燥させた偏光膜(約0.2g)を水に溶かし、マンニトールおよびBTB溶液を少量滴下した水溶液に、0.1mol/LのNaOH水溶液をビュレットを用いて中和滴定し、偏光膜のホウ素含有率を下記式に基づき算出した。
偏光膜のホウ素含有量(重量%)=C×V×Mw/M×100
C:NaOH水溶液の濃度(mol/L)
V:NaOH水溶液の滴下量(L)
Mw:ホウ素の分子量(g/mol)
M:120℃、2時間乾燥後の偏光膜重量(g)
接着剤として、アセトアセチル基を含有するポリビニルアルコール樹脂(平均重合度が1,200、ケン化度が98.5モル%、アセトアセチル化度が5モル%)とメチロールメラミンとを重量比3:1で含有する水溶液を用いた。この接着剤を用いて、第1の透明保護フィルムとして、上記で得られた偏光膜の一方の面(画像表示セル側表面)に、シクロオレフィン系フィルム(透湿度が10g/(m2・24h)、日本触媒製、商品名「ZTフィルム」)(以下、このフィルムを「透明フィルムA」と称する)、また、第2の透明保護フィルムとして、他方の面(視認側)に、トリアセチルセルロースフィルム(富士フィルム製、商品名「TJ40UL」)にHCを形成した厚み48μmの透明保護フィルム(透湿度は300g/(m2・24h)「透明フィルムB」と称する)をロール貼合機で貼り合わせた後、引き続きオーブン内で加熱乾燥(温度が90℃、時間が10分間)させて、偏光膜の両面に透明保護フィルムが貼り合わせられた偏光フィルムを作製した。
目視の外観検査(レベル見本サンプルを用いた相対評価、官能評価)にてレベル分けした。レベル1または2であれば、実用上使用でき、レベル1がより好ましい。
レベル1:偏光フィルム状態で凹凸は視認されない。
レベル2:疑似パネル(ガラス)貼合状態では視認されず、偏光フィルム状態で凹凸が視認される。
レベル3:疑似パネル(ガラス)貼合状態で凹凸が視認される。
攪拌羽根、温度計、窒素ガス導入管、冷却器を備えた4つ口フラスコに、ブチルアクリレート99部、4-ヒドロキシブチルアクリレート1部を含有するモノマー混合物を仕込んだ。さらに、前記モノマー混合物(固形分)100部に対して、重合開始剤として2,2’-アゾビスイソブチロニトリル0.1部を酢酸エチル100部と共に仕込み、緩やかに攪拌しながら窒素ガスを導入して窒素置換した後、フラスコ内の液温を55℃付近に保って8時間重合反応を行って、重量平均分子量(Mw)180万のアクリル系ポリマーの溶液を調製した。その後、得られたアクリル系ポリマーの溶液の固形分100部に対して、イソシアネート架橋剤(東ソー社製、商品名「タケネートD110N」、トリメチロールプロパン/キシリレンジイソシアネート付加物)0.02部、シランカップリング剤(信越化学工業社製、商品名「X-41-1056」)0.2部を配合して、アクリル系粘着剤組成物の溶液を調製した。
上記で得られたアクリル系粘着剤組成物の溶液を、シリコーン系剥離剤で処理されたポリエチレンテレフタレートフィルム(三菱化学ポリエステルフィルム製、商品名「MRF38」、セパレータフィルム)の片面に、乾燥後の粘着剤層の厚さが20μmになるように塗布し、90℃で1分間乾燥を行い、セパレータフィルムの表面に粘着剤層を形成した。次いで、上記で作製した偏光フィルムの画像表示セル側の保護フィルム面に、セパレータフィルム上に形成した粘着剤層を転写して、粘着剤層付き偏光フィルムを作製した。
上記で得られた粘着剤層付き偏光フィルムを、偏光膜の吸収軸が長辺と平行になるように40×40mmのサイズに切断し、粘着剤層を介して、ガラス板(50×45mm、厚さ1.1mm)を貼り合わせ、50℃、0.5MPaで15分間オートクレーブ処理して、疑似画像表示パネル(片面粘着剤層付き偏光フィルムを有する積層体)を作製した。
上記で得られた疑似画像表示パネルを、温度85℃および相対湿度85%で240時間の耐久試験に供した。投入(加湿)前後の偏光度(ΔP)を測定した。偏光度は、分光光度計(大塚電子社製、LPF-200)を用いて測定した。偏光度(ΔP)は、-0.01~-0.03であることが好ましく、0~-0.01であることがより好ましい。なお、測定波長は、380~780nm(5nm毎)である。結果を表1に示す。
偏光膜の作製において、延伸浴のホウ酸濃度、及び洗浄浴の温度を、表1に記載のように変更したこと以外は、実施例1と同様の操作により、疑似画像表示パネルを作製した。
偏光膜の作成において、洗浄浴工程と偏光子の乾燥工程の間に約40℃の温水を供給したグラビアロールと偏光子を接触させる第2の洗浄工程を追加したこと、延伸浴のホウ酸濃度、及び洗浄浴の温度を、表1に記載のように変更したこと以外は、実施例1と同様の操作により、疑似画像表示パネルを作製した。
偏光膜の作製において、延伸浴のホウ酸濃度、及び洗浄浴の温度を、表1に記載のように変更したこと以外は、実施例1と同様の操作により、疑似画像表示パネルを作製した。
Claims (9)
- ポリビニルアルコール系フィルムに二色性物質が吸着配向し、ホウ酸架橋により配向固定された偏光膜であって、(A)FT-IRにおけるATR法で算出されるホウ酸指数と、(B)中和滴定法により算出されるホウ酸含有量(重量%)の比((A)/(B))が、0.13未満であることを特徴とする偏光膜。
- 前記(A)FT-IRにおけるATR法で算出されるホウ酸指数と、前記(B)中和滴定法により算出されるホウ酸含有量(重量%)の比((A)/(B))が、0.06以上であることを特徴とする請求項1に記載の偏光膜。
- 前記(A)FT-IRにおけるATR法で算出されるホウ酸指数が、3.46以下であることを特徴とする請求項1又は2に記載の偏光膜。
- 前記(B)中和滴定法により算出されるホウ酸含有量(重量%)が、20重量%以上であることを特徴とする請求項1~3のいずれかに記載の偏光膜。
- 前記偏光膜は、ヨウ素が吸着配向してなるヨウ素系偏光膜であることを特徴とする請求項1~4のいずれかに記載の偏光膜。
- 第1の透明保護フィルムと請求項1~5のいずれかに記載の偏光膜が、水系接着剤層を介して貼り合わされていることを特徴とする偏光フィルム。
- 前記第1の透明保護フィルムは、透湿度が50g/(m2・24h)以下であることを特徴とする請求項6に記載の偏光フィルム。
- 画像表示セルに、請求項7に記載の偏光フィルムの第1の透明保護フィルム側が貼り合わされていることを特徴とする画像表示パネル。
- 請求項8に記載の画像表示パネルと、前面透明部材を有することを特徴とする画像表示装置。
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