WO2009084426A1 - 光学フィルム及び光学シート - Google Patents
光学フィルム及び光学シート Download PDFInfo
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- WO2009084426A1 WO2009084426A1 PCT/JP2008/072850 JP2008072850W WO2009084426A1 WO 2009084426 A1 WO2009084426 A1 WO 2009084426A1 JP 2008072850 W JP2008072850 W JP 2008072850W WO 2009084426 A1 WO2009084426 A1 WO 2009084426A1
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- Prior art keywords
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- carbon atoms
- resin
- optical
- optical film
- Prior art date
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- BRPPERAIDCJZCW-UHFFFAOYSA-N CCOC(CCOc(c(C)c1O)ccc1-c1nc(-c(ccc(OCCC(OCC)=O)c2C)c2O)nc(-c(ccc(OCCC(OCC)=O)c2C)c2O)n1)=O Chemical compound CCOC(CCOc(c(C)c1O)ccc1-c1nc(-c(ccc(OCCC(OCC)=O)c2C)c2O)nc(-c(ccc(OCCC(OCC)=O)c2C)c2O)n1)=O BRPPERAIDCJZCW-UHFFFAOYSA-N 0.000 description 1
- WRZKNVONNUINHK-UHFFFAOYSA-N Cc(c(O)c(cc1)-c2nc(-c(ccc(OCCCC(OC)=O)c3C)c3O)nc(-c(c(O)c3C)ccc3OCCCC(OC)=O)n2)c1OCCCC(OC)=O Chemical compound Cc(c(O)c(cc1)-c2nc(-c(ccc(OCCCC(OC)=O)c3C)c3O)nc(-c(c(O)c3C)ccc3OCCCC(OC)=O)n2)c1OCCCC(OC)=O WRZKNVONNUINHK-UHFFFAOYSA-N 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/34—Heterocyclic compounds having nitrogen in the ring
- C08K5/3467—Heterocyclic compounds having nitrogen in the ring having more than two nitrogen atoms in the ring
- C08K5/3477—Six-membered rings
- C08K5/3492—Triazines
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2323/00—Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
- C09K2323/03—Viewing layer characterised by chemical composition
- C09K2323/031—Polarizer or dye
-
- 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
Definitions
- the present invention relates to an optical film and an optical sheet made of a resin containing a specific triazine compound, which is excellent in sustaining the polarizing ability of a polarizing plate, and in particular, protection for a polarizing plate used in a liquid crystal display device and the like.
- the present invention relates to an optical film and an optical sheet that can be used for various functional films such as an antireflection film used for substrates and plasma displays, and various functional films used for organic EL displays and the like.
- Optical film and optical sheet are those that absorb light regardless of whether or not the wavelength is selected, those that have a light emitting function such as fluorescence or phosphorescence, those that can switch between transmission and blocking by voltage, etc., and those that have a polarizing function And those having various optical functions such as those having an antiglare function.
- various optical films and optical sheets such as a light diffusing film, a light diffusing sheet, a protective film for a polarizing plate, and a protective sheet are laminated and used in product development such as a plasma display and an organic EL. It plays an important function in asserting its superiority over other flat panel displays.
- a polarizing plate indispensable for a liquid crystal display device is a polarizing film (polarizer) in which a polymer such as polyvinyl alcohol is dyed with iodine or a dichroic dye and oriented by stretching, and a protective film such as triacetyl cellulose as necessary. Or it is manufactured by sticking the protective sheet from both sides, but the polarizing ability is lowered and the contrast is lowered by using for a long time.
- a polarizing plate using iodine is less expensive than a dichroic dye, but has a problem of lacking stability.
- polyvinyl alcohol has a disadvantage that it is colored yellow when exposed to ultraviolet rays.
- Patent Document 2 proposes to use a specific benzotriazole UV absorber. None of them are excellent in the adhesion between the polarizing plate and the protective film for the polarizing plate, or show the effect of improving the light resistance of the polymer used in the film, but are not necessarily satisfactory in maintaining the polarizing ability of the polarizing plate. It was.
- An object of the present invention is to provide an optical film and an optical sheet excellent in sustaining the polarizing ability of a polarizing plate using iodine as a pigment.
- the present invention is an optical film or an optical sheet used in a polarizing plate using iodine as a pigment or a liquid crystal display device using the polarizing plate, and contains a triazine compound represented by the following general formula (1).
- the above object is achieved by providing an optical film or an optical sheet formed from a resin.
- R 1 is a linear or branched alkyl group having 1 to 12 carbon atoms, a cycloalkyl group having 3 to 8 carbon atoms, an alkenyl group having 3 to 8 carbon atoms, or 6 to 18 carbon atoms.
- the group may be substituted with a hydroxy group, a halogen atom, an alkyl group having 1 to 12 carbon atoms or an alkoxy group, and is interrupted with an oxygen atom, a sulfur atom, a carbonyl group, an ester group, an amide group or an imino group.
- R 2 represents an alkyl group having 1 to 8 carbon atoms or an alkenyl group having 3 to 8 carbon atoms.
- R 1 in the general formula (1) is a linear or branched alkyl group having 1 to 12 carbon atoms (provided that these alkyl groups are a hydroxy group, a halogen atom or an alkoxy group). And may be interrupted by an oxygen atom, a sulfur atom, a carbonyl group, an ester group, an amide group or an imino group), and R 2 is an alkyl group having 1 to 8 carbon atoms.
- An optical film and an optical sheet containing a triazine compound are preferable because they are excellent in maintaining the polarization ability, which is an object of the present invention.
- the triazine compound is added to a film or sheet between a polarizing film (polarizer) and external light such as a protective film or a protective sheet for a polarizing plate, such as a backlight, sunlight, or illumination.
- polarizing film polarizer
- external light such as a protective film or a protective sheet for a polarizing plate, such as a backlight, sunlight, or illumination.
- Polarized light can be maintained for a long time.
- the optical film and the optical sheet in which the resin is an acrylic ester resin, polycarbonate resin, polyethylene terephthalate resin, polyethylene naphthalate resin, polystyrene resin, cellulose ester resin, or norbornene resin are transparent. It is preferable because of its excellent polarization characteristics and electrical insulation.
- the polarizing film (polarizer) used for the polarizing plate is not particularly limited as long as it is obtained by dyeing a base polymer such as polyvinyl alcohol with a dye and performing orientation treatment such as stretching, and using iodine as the dye.
- a base polymer such as polyvinyl alcohol
- orientation treatment such as stretching
- iodine is considered to exhibit polarizing ability for a wide range of wavelengths by becoming a polyiodine ion, for example, iodine atoms that are associated by impregnating a base polymer into aqueous solutions having different mixing ratios of iodine and potassium iodide.
- a polarizing plate containing polyiodine ions having different numbers is obtained.
- the iodine concentration in the aqueous solution is usually 0.01 to 0.5% by mass, preferably 0.02 to 0.4% by mass, and the potassium iodide concentration is usually 0.01 to 10% by mass, preferably 0.02%. ⁇ 8% by mass.
- the polarizing plate may be further subjected to boric acid treatment, iodine ion treatment and the like.
- the triazine compound used in the present invention is represented by the following general formula (1).
- R 1 is a linear or branched alkyl group having 1 to 12 carbon atoms, a cycloalkyl group having 3 to 8 carbon atoms, an alkenyl group having 3 to 8 carbon atoms, or 6 to 18 carbon atoms.
- the group may be substituted with a hydroxy group, a halogen atom, an alkyl group having 1 to 12 carbon atoms, an alkoxy group, or interrupted by an oxygen atom, a sulfur atom, a carbonyl group, an ester group, an amide group, or an imino group.
- R 2 represents an alkyl group having 1 to 8 carbon atoms or an alkenyl group having 3 to 8 carbon atoms.
- examples of the linear or branched alkyl group having 1 to 12 carbon atoms represented by R 1 include methyl, ethyl, propyl, isopropyl, butyl, isobutyl, sec-butyl, tert-butyl, and amyl.
- linear or branched alkyl groups such as tertiary amyl, hexyl, octyl, secondary octyl, tertiary octyl, 2-ethylhexyl, decyl, undecyl, dodecyl and the like.
- Examples of the cycloalkyl group having 3 to 8 carbon atoms include cyclopropyl, cyclopentyl, cyclohexyl, cycloheptyl and the like. Among them, the hexyl group is preferable because it is excellent in maintaining the polarization ability, which is the object of the present invention.
- Examples of the alkyl group having 1 to 8 carbon atoms represented by R 2 include methyl, ethyl, propyl, isopropyl, butyl, sec-butyl, tert-butyl, isobutyl, amyl, tert-amyl, octyl, and tert-butyl.
- Octyl and the like can be mentioned, and among them, the methyl group is preferable because it is excellent in maintaining the polarization ability which is the object of the present invention.
- Examples of the alkenyl group having 3 to 8 carbon atoms represented by R 1 and R 2 include linear and branched propenyl, butenyl, pentenyl, hexenyl, heptenyl and octenyl regardless of the position of the unsaturated bond.
- Examples of the aryl group having 6 to 18 carbon atoms represented by R 1 include phenyl, naphthyl, biphenyl and the like.
- Examples of the alkylaryl group having 7 to 18 carbon atoms include methylphenyl and dimethylphenyl. , Ethylphenyl, octylphenyl, etc.
- Examples of the arylalkyl group having 7 to 18 carbon atoms include benzyl, 2-phenylethyl, 1-methyl-1-phenylethyl and the like.
- aryl group having a substituent or interruption examples include 4-methylphenyl, 3-chlorophenyl, 4-benzyloxyphenyl, 4-cyanophenyl, 4-phenoxyphenyl, 4-glycidyloxyphenyl, 4-isocyanurate phenyl, etc. Is mentioned.
- Examples of the substituent represented by R 1 and the optionally substituted alkyl group and cycloalkyl group include 2-hydroxypropyl, 2-methoxyethyl, 3-sulfonyl-2-hydroxypropyl, 4-methylcyclohexyl, etc. Is mentioned.
- Examples of the triazine compound represented by the general formula (1) used in the optical film and the optical sheet of the present invention include the following compound No. 1-No. And the like.
- the amount of the triazine compound used in the present invention is preferably 0.001 to 10 parts by mass, more preferably 0.05 to 5 parts by mass with respect to 100 parts by mass of the resin. If the use amount of the triazine compound is less than 0.001 part by mass, the polarization ability cannot be sufficiently maintained, and if the use amount of the triazine compound is more than 10 parts by mass, the polarization ability is reduced due to a decrease in resin physical properties or bleeding. Cause problems such as damage.
- any synthetic resin excellent in visible light transmittance can be used.
- polycarbonate resin polyethylene terephthalate resin, polyethylene naphthalate resin, cellulose triacetate, cellulose acetate butyrate, etc.
- Cellulose ester resins, acrylic ester resins such as polymethyl acrylate and polymethyl methacrylate, cycloolefin resins, polystyrene resins and norbornene resins are excellent in transparency, durability, polarization characteristics, and electrical insulation. Therefore, it is preferable.
- the method for forming the optical film and optical sheet of the present invention may be a cast method or a melt extrusion method, and can be formed by a conventional method, and the thickness thereof is not particularly limited.
- the thickness is preferably 5 to 300 ⁇ m, more preferably 5 to 150 ⁇ m, and preferably 200 ⁇ m to 10 mm, more preferably 300 ⁇ m to 5 mm. Since the triazine compound used in the present invention is excellent in volatilization resistance, it is also suitable for production under high-temperature conditions (200 to 350 ° C.) with high productivity as processing conditions for the casting method and the melt extrusion method.
- the optical film and optical sheet of the present invention may be directly bonded to the polarizing plate, may be bonded via an adhesive layer, may be laminated with another functional film interposed therebetween, and other functionalities.
- the triazine compound used in the present invention may be blended to produce a multifunctional film.
- the surface of the optical film and optical sheet to which the polarizing plate is not adhered may be subjected to a treatment for the purpose of hard coat layer, antireflection treatment, antisticking, diffusion or antiglare.
- the liquid crystal display device using the optical film and the optical sheet of the present invention is excellent in sustaining polarization ability, and the applied liquid crystal display device is not particularly limited, and has a driving system such as TN, STN, TFT, and a backlight.
- a driving system such as TN, STN, TFT, and a backlight.
- functions as a display device such as the type of light source such as a fluorescent lamp or LED, whether or not to use external light such as sunlight as a light source such as a reflection type or a transmission type, and the presence or absence of a touch panel function It can be suitably used regardless of the presence or absence and degree of these measures.
- the triazine compound used in the present invention has excellent solubility in acrylic ester resin, polycarbonate resin, polyethylene terephthalate resin, polyethylene naphthalate resin, polystyrene resin, cellulose ester resin, norbornene resin, etc. In addition to preventing iodine from losing its polarizing ability with light, it has effects such as excellent adhesion to the polarizing plate, stable film properties, and no contamination of other members. I can expect.
- optical film and optical sheet of the present invention are blended with additives such as antioxidants (phenolic, phosphorus or thioether type), plasticizers and processing aids that are usually used depending on the type of resin used. Is preferred.
- additives such as antioxidants (phenolic, phosphorus or thioether type), plasticizers and processing aids that are usually used depending on the type of resin used. Is preferred.
- phenolic antioxidant examples include 2,6-ditert-butyl-p-cresol, 2,6-diphenyl-4-octadecyloxyphenol, distearyl (3,5-ditert-butyl-4). -Hydroxybenzyl) phosphonate, 1,6-hexamethylenebis [(3,5-ditert-butyl-4-hydroxyphenyl) propionic acid amide], 4,4'-thiobis (6-tert-butyl-m-cresol ), 2,2′-methylenebis (4-methyl-6-tert-butylphenol), 2,2′-methylenebis (4-ethyl-6-tert-butylphenol), 4,4′-butylidenebis (6-tert-butyl) -M-cresol), 2,2′-ethylidenebis (4,6-ditert-butylphenol), 2,2′-ethylidenebis (4-secondarybutyl-6-tert-butylphenol)
- Examples of the phosphorus antioxidant include trisnonylphenyl phosphite, tris [2-tert-butyl-4- (3-tert-butyl-4-hydroxy-5-methylphenylthio) -5-methylphenyl].
- Phosphite tridecyl phosphite, octyl diphenyl phosphite, di (decyl) monophenyl phosphite, di (tridecyl) pentaerythritol diphosphite, di (nonylphenyl) pentaerythritol diphosphite, bis (2,4-di Tert-butylphenyl) pentaerythritol diphosphite, bis (2,6-ditert-butyl-4-methylphenyl) pentaerythritol diphosphite, bis (2,4,6-tritert-butylphenyl) pentaerythritol diphosphite Phosphite, bis (2,4-dicumylphenyl) pen Erythritol diphosphite, tetra (tridecyl) isopropylidene diphenol diphosphit
- thioether-based antioxidants examples include dialkylthiodipropionates such as dilauryl thiodipropionate, dimyristyl thiodipropionate, distearyl thiodipropionate, and pentaerythritol tetra ( ⁇ -dodecyl mercaptopropionate). And ⁇ -alkyl mercaptopropionic esters of polyols.
- the triazine-based ultraviolet absorber used in the present invention is particularly excellent in stabilizing iodine used as a polarizer of a polarizing plate, but a liquid crystal display device includes a protective film and a protective sheet for a polarizing plate, and a light diffusion film.
- a UV absorber used in the optical film and the optical sheet of the present invention it has many elements that should give stability to light, such as a resin used in a light diffusion sheet and a brightness enhancement film, and a liquid crystal compound itself. It is preferable to use other ultraviolet absorbers together. Examples of other ultraviolet absorbers include benzotriazole ultraviolet absorbers, other triazine ultraviolet absorbers, and benzophenone ultraviolet absorbers.
- benzotriazole ultraviolet absorber examples include 2- (2′-hydroxy-5′-methylphenyl) benzotriazole, 2- (2′-hydroxy-3 ′, 5′-ditert-butylphenyl) -5- Chlorobenzotriazole, 2- (2′-hydroxy-3′-tert-butyl-5′-methylphenyl) -5-chlorobenzotriazole, 2- (2′-hydroxy-5′-tert-octylphenyl) benzotriazole 2- (2′-hydroxy-3 ′, 5′-dicumylphenyl) benzotriazole, 2- (2′-hydroxy-3′-tert-butyl-5′-carboxyphenyl) benzotriazole, 2,2 ′ And 2- (2′-hydroxyphenyl) benzotriazoles such as methylenebis (4-tert-octyl-6-benzotriazolyl) phenol.
- triazine ultraviolet absorber examples include 2- (2-hydroxy-4-octoxyphenyl) -4,6-bis (2,4-dimethylphenyl) -s-triazine, 2- (2-hydroxy-4-) Hexyloxyphenyl) -4,6-diphenyl-s-triazine, 2- (2-hydroxy-4-propoxy-5-methylphenyl) -4,6-bis (2,4-dimethylphenyl) -s-triazine, 2- (2-hydroxy-4-hexyloxyphenyl) -4,6-dibiphenyl-s-triazine, 2,4-bis (2-hydroxy-4-octoxyphenyl) -6- (2,4-dimethyl)
- triaryltriazines such as phenyl) -s-triazine and 2,4,6-tris (2-hydroxy-4-octoxyphenyl) -s-triazine.
- benzophenone ultraviolet absorber examples include 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-octoxybenzophenone, and 5,5′-methylenebis (2-hydroxy-4-methoxybenzophenone). And 2-hydroxybenzophenones.
- a structure excellent in solubility in the base resin is preferable, and also during processing and use It has a high molecular weight structure that is difficult to volatilize by heat, has a molecular weight of 500 or more, more preferably a molecular weight of 700 or more, and may have a high molecular weight by introducing a polymerizable group or a reactive group, or may be incorporated into a resin. Good.
- the amount of these other ultraviolet absorbers used is preferably 0.01 to 10 parts by mass, more preferably 0.05 to 5 parts by mass with respect to 100 parts by mass of the resin.
- the plasticizer is not particularly limited, and examples thereof include phosphate ester plasticizers and polyester plasticizers, and these can be used alone or in combination of two or more.
- phosphate ester plasticizer examples include triphenyl phosphate, tricresyl phosphate, cresyl diphenyl phosphate, octyl diphenyl phosphate, diphenyl biphenyl phosphate, trioctyl phosphate, tributyl phosphate, and the like.
- polyester plasticizer examples include linear polyesters composed of aliphatic dibasic acids, aromatic dibasic acids and diol compounds, and linear polyesters of hydroxycarboxylic acids.
- aliphatic dibasic acid examples include oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, azelaic acid, sebacic acid, fumaric acid, 2,2-dimethylglutaric acid, suberic acid, 1,3 -Cyclopentane dicarboxylic acid, 1,4-cyclohexane dicarboxylic acid, 1,3-cyclohexane dicarboxylic acid, diglycolic acid, itaconic acid, maleic acid, 2,5-norbornene dicarboxylic acid and the like.
- aromatic dibasic acid examples include phthalic acid, 1,5-naphthalenedicarboxylic acid, 2,6-naphthalenedicarboxylic acid, biphenyl dicarboxylic acid, anthracene dicarboxylic acid, and terphenyl dicarboxylic acid.
- diol compound examples include ethylene glycol, propylene glycol, 1,3-propanediol, 1,2-butanediol, 1,3-butanediol, 1,4-butanediol, 2-methylpropanediol, 1,3-butanediol, Dimethylpropanediol, 1,5-pentanediol, 2,2-dimethyl-1,3-propanediol, 1,6-hexanediol, 3-methyl-1,5-pentanediol, 1,9-nonanediol, 2 , 2,4-trimethyl-1,6-hexanediol, 2-ethyl-2-butylpropanediol, diethylene glycol, triethylene glycol, tetraethylene glycol, dipropylene glycol, tripropylene glycol, tetrapropylene glycol, thiodiethylene glycol, 1 , 3-shi
- hydroxycarboxylic acid examples include 4-hydroxymethylcyclohexanecarboxylic acid, hydroxytrimethylacetic acid, 6-hydroxycaproic acid, glycolic acid, and lactic acid.
- polyester plasticizers include trivalent or higher polyols and polyesters of monocarboxylic acid compounds.
- examples of the trivalent or higher polyols include glycerin, trimethylolpropane, pentaerythritol, sorbitol, and their condensates such as dipentaerythritol and tripentaerythritol.
- polyether polyols obtained by adding alkylene oxides such as ethylene oxide to these polyols may be used.
- Examples of the monocarboxylic acid include benzoic acid, p-methylbenzoic acid, m-methylbenzoic acid, dimethylbenzoic acid, p-tert-butylbenzoic acid, p-methoxybenzoic acid, p-chlorobenzoic acid, naphthylic acid, biphenyl.
- Examples thereof include aromatic carboxylic acids such as carboxylic acids; alicyclic carboxylic acids such as cyclohexanecarboxylic acid; and aliphatic acids such as acetic acid, propionic acid, and 2-ethylhexanoic acid.
- Monocarboxylic acids may be used alone or in combination.
- plasticizers are preferably used in an amount of 0 to 20% by mass in the resin from the viewpoint of film performance and processability.
- the content is more preferably 1 to 15% by mass, particularly preferably 2 to 10% by mass from the viewpoint of dimensional stability, and polyester plasticizers are preferable in terms of hydrolysis.
- the optical film and the optical sheet of the present invention are not limited to use as the above-mentioned various blends and liquid crystal display devices, and conventionally known JP-A-2003-84269, JP-A-2002-47357, JP-A-2007.
- the liquid crystal display device and the optical film and optical sheet used in the liquid crystal display device described in JP-A-108775, JP-A No. 2007-17555 and the like are suitably used in known compounding agents and structures.
- the protective film test piece obtained by the above production method was laminated with a polarizing plate whose dye is iodine (product name: Balilite LL-81-18, thickness: 100 ⁇ m, manufactured by Sanlitz Co., Ltd.), and a sunshine weatherometer (83 ° C.). , No rain, light source carbon arc) after 240 hours, the light absorption was measured at wavelengths of 400 nm, 550 nm, and 700 nm.
- the absorbance retention is 100% compared to the absorbance before light irradiation with the sunshine weatherometer, it functions normally as a polarizer, and if the absorbance decreases, the polarizing ability is lost, In order to show that it stopped functioning, the performance as a protective film in a polarizing plate using iodine was evaluated by the absorbance retention. The results are shown in Table 1. Moreover, the polarizing plate was previously overlapped in a crossed Nicol state, a protective film test piece was pasted thereon, and the result of measuring the total light transmittance (%) and the absorbance at a wavelength of 650 nm after 240 hours with a sunshine weatherometer is shown. Also refer to 1.
- Examples 2-1 to 2-7 and Comparative Examples 2-1 to 2-4 ⁇ Manufacture of film test piece and its light resistance evaluation> Except for blending UV absorbers listed in Table 2 or Table 3 in 100 wt parts of triacetyl cellulose resin (manufactured by Daicel Chemical Industries, Ltd., product name LT-35) in the blending amounts shown in the same table. A film test piece was produced by the same production method as that for the protective film in Example 1.
- the film specimen obtained by the above production method was subjected to a retention rate (%) of total light transmittance (%) after 240, 360 and 480 hours with a sunshine weatherometer (83 ° C., no rain, light source carbon arc). ) And light resistance was evaluated.
- the results are shown in Tables 4 and 5.
- the abbreviations of the resins used in the table are as follows.
- TAC triacetyl cellulose resin: manufactured by Daicel Chemical Industries, Ltd., product name LT-35
- PC Polycarbonate resin: Product name E-2000, manufactured by Mitsubishi Engineering Plastics Co., Ltd.
- PMMA Methacrylic resin: manufactured by Mitsubishi Rayon Co., Ltd., product name Acrypet VH000 NBE: Norbornene resin: manufactured by JSR Corporation, product name ARTON F5023 PET: Polyethylene terephthalate resin: Teijin Chemicals, product name TR-8550 PS: polystyrene resin: polystyrene manufactured by Scientific Polymer Products, weight average molecular weight (Mw) of about 200,000
- the specific triazine compound according to the present invention is slightly inferior to the benzotriazole compound and other triazine compounds at a short wavelength. It exhibits a retention rate of 90% or more, and is excellent in a retention rate in a long wavelength region. In particular, the retention rate is particularly excellent at 97% at 550 nm where other compounds exhibit a retention rate of only about 87%. Further, from the results at the time of crossed Nicols, the triazine compound according to the present invention shows a particularly remarkable effect with respect to the retention rate.
- the triazine compound according to the present invention exhibits an excellent effect as compared with the conventional ultraviolet absorber, and is equal to or more than half the blend amount of the conventional ultraviolet absorber. It turns out that the effect is shown.
- the triazine compound according to the present invention exhibits a high absorbance retention at all wavelengths necessary for maintaining the function as a polarizing plate, and particularly exhibits a remarkable effect on the retention in the long wavelength region and crossed Nicols. To do.
- the same or better effect can be achieved with half the compounding amount of the conventional compounds, and good effects can be exhibited even with various types of resins. Therefore, the specific triazine compound according to the present invention can supply an optical film and an optical sheet excellent in performance such as sustainability of polarization in a polarizing plate using iodine as a pigment.
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Abstract
Description
偏光板に用いられる偏光フィルム(偏光子)としては、ポリビニルアルコール等の基材ポリマーを色素で染色して延伸等の配向処理したものであって、色素としてヨウ素を用いたものであれば特に制限されない。ヨウ素はポリヨウ素イオンとなることで幅広い波長に対して偏光能を示すと考えられ、例えば、ヨウ素とヨウ化カリウムの配合比が異なる水溶液に基材ポリマーを含浸させることで会合しているヨウ素原子の数が異なるポリヨウ素イオンを含有する偏光板が得られる。水溶液中のヨウ素濃度は通常0.01~0.5質量%、好ましくは0.02~0.4質量%であり、ヨウ化カリウム濃度は通常0.01~10質量%、好ましくは0.02~8質量%である。偏光板は、さらにホウ酸処理、ヨウ素イオン処理等を行ってもよい。
本発明の光学フィルム及び光学シートの成形方法は、キャスト法でも溶融押出し法でもよく、従来と同様の方法によって成形することができ、その厚さも特に限定されるものではないが、例えばフィルムに成形する場合には、好ましくは5~300μmであり、より好ましくは5~150μmであり、シートに成形する場合には、好ましくは200μm~10mmであり、より好ましくは300μm~5mmである。
本発明に用いるトリアジン化合物は耐揮散性にも優れるのでキャスト法、溶融押出し法の加工条件として生産性の高い高温条件(200~350℃)での製造にも適している。
<保護フィルムの製造及びその評価>
ノルボルネン樹脂(JSR(株)製、製品名ARTON F5023)3g及び表1~3記載の紫外線吸収剤30mgを溶媒(トルエン/シクロヘキサン=9/1)7gに溶解し、キャスト法により厚さ40μmのフィルムを作製し、1辺2cmの正方形の保護フィルム試験片を得た。
<フィルム試験片の製造及びその耐光性評価>
トリアセチルセルロース樹脂(ダイセル化学工業(株)製、製品名LT-35)100質量部に対して表2又は表3記載の紫外線吸収剤を同表に記載の配合量で配合する以外は、上記実施例1における保護フィルムの製造方法と同様の製造方法にてフィルム試験片を作製した。
<フィルム試験片の製造及びその耐光性評価>
下記表4又は5に記載の樹脂100質量部に対して、同表に記載の紫外線吸収剤を0.2質量部配合する以外は、上記実施例1における保護フィルムの製造方法と同様の製造方法にてフィルム試験片を作製した。
尚、表中の使用樹脂の略号はそれぞれ以下の通りである。
TAC:トリアセチルセルロース樹脂:ダイセル化学工業(株)製、製品名LT-35
PC:ポリカーボネート樹脂:三菱エンジニアリングプラスチックス(株)製、製品名E-2000
PMMA:メタクリル樹脂:三菱レイヨン(株)製、製品名アクリペットVH000
NBE:ノルボルネン樹脂:JSR(株)製、製品名ARTON F5023
PET:ポリエチレンテレフタレート樹脂:帝人化成(株)製、製品名TR-8550
PS:ポリスチレン樹脂:サイエンティフィック・ポリマー・プロダクツ(Scientific Polymer Products)製ポリスチレン、重量平均分子量(Mw)約20万
紫外線吸収剤を配合せずに下記表6に記載の樹脂を用いる以外は、上記実施例1における保護フィルムの製造方法と同様の製造方法にてフィルム試験片を作製し、更に同様の評価方法によって240、360及び480時間後の全光線透過率(%)の保持率(%)を測定した。結果を表6に併せて記す。
ここで、偏光板としての機能保持には全ての波長で高い保持率を示す必要があるところ、本発明に係る特定のトリアジン化合物は、短波長ではベンゾトリアゾール化合物や他のトリアジン化合物に若干劣るものの90%以上の保持率を示し、長波長域での保持率に優れ、特に他の化合物では87%程度の保持率しか示さない550nmにおいて97%と特異的に優れた保持率を示している。
また、クロスニコル時での結果から、本発明に係るトリアジン化合物は、保時率に関し、特に顕著な効果を示している。
ことが可能となる。
Claims (5)
- 色素としてヨウ素を用いた偏光板若しくは該偏光板を用いた液晶表示装置に用いられる光学フィルム又は光学シートであって、下記一般式(1)で表されるトリアジン化合物を含有する樹脂から形成された光学フィルム又は光学シート。
(式中、R1は炭素原子数1~12の直鎖又は分岐のアルキル基、炭素原子数3~8のシクロアルキル基、炭素原子数3~8のアルケニル基、炭素原子数6~18のアリール基、炭素原子数7~18のアルキルアリール基又は炭素原子数7~18のアリールアルキル基を表す。但し、これらのアルキル基、シクロアルキル基、アルケニル基、アリール基、アルキルアリール基又はアリールアルキル基は、ヒドロキシ基、ハロゲン原子、炭素原子数1~12のアルキル基又はアルコキシ基で置換されていてもよく、酸素原子、硫黄原子、カルボニル基、エステル基、アミド基又はイミノ基で中断されていてもよい。また、上記の置換及び中断は組み合わされてもよい。R2は炭素原子数1~8のアルキル基又は炭素原子数3~8のアルケニル基を表す。) - 上記一般式(1)におけるR1が炭素原子数1~12の直鎖又は分岐のアルキル基(但し、これらのアルキル基はヒドロキシ基、ハロゲン原子又はアルコキシ基で置換されていてもよく、酸素原子、硫黄原子、カルボニル基、エステル基、アミド基又はイミノ基で中断されていてもよい。)であり、R2が炭素原子数1~8のアルキル基である請求の範囲第1項に記載の光学フィルム又は光学シート。
- 上記樹脂が、アクリル酸エステル系樹脂、ポリカーボネート系樹脂、ポリエチレンテレフタレート系樹脂、ポリエチレンナフタレート系樹脂、ポリスチレン系樹脂、セルロースエステル系樹脂、シクロオレフィン系樹脂又はノルボルネン系樹脂である請求の範囲第1又は2項に記載の光学フィルム又は光学シート。
- 上記光学フィルム又は光学シートが、液晶表示素子に接している偏光板の外表面側に設置される光学フィルム若しくは光学シート、又は該偏光板用の保護フィルム若しくは保護シートである請求の範囲第1~3項の何れかに記載の光学フィルム又は光学シート。
- 上記光学フィルム又は光学シートが、偏光板用の保護フィルム又は保護シートである請求の範囲第1~4項の何れかに記載の光学フィルム又は光学シート。
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| EP08866466.9A EP2226658B1 (en) | 2007-12-27 | 2008-12-16 | Optical film and optical sheet |
| PL08866466T PL2226658T3 (pl) | 2007-12-27 | 2008-12-16 | Folia optyczna oraz arkusz optyczny |
| CN2008801185347A CN101883996A (zh) | 2007-12-27 | 2008-12-16 | 光学薄膜和光学片材 |
| US12/743,303 US20100247811A1 (en) | 2007-12-27 | 2008-12-16 | Optical film and optical sheet |
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| JP2008-318772 | 2008-12-15 |
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| US (1) | US20100247811A1 (ja) |
| EP (1) | EP2226658B1 (ja) |
| JP (1) | JP2009098701A (ja) |
| KR (1) | KR20100108327A (ja) |
| CN (1) | CN101883996A (ja) |
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| WO2012133880A1 (ja) * | 2011-03-31 | 2012-10-04 | 住友化学株式会社 | 偏光板 |
| JP2012201768A (ja) * | 2011-03-24 | 2012-10-22 | Adeka Corp | 蛍光部材被覆用樹脂組成物及びこれを塗布してなる蛍光部材 |
| WO2014046225A1 (ja) * | 2012-09-24 | 2014-03-27 | 帝人株式会社 | 1軸延伸多層積層フィルム、それからなる偏光板、液晶表示装置用光学部材及び液晶表示装置 |
| WO2016147956A1 (ja) * | 2015-03-16 | 2016-09-22 | 住友化学株式会社 | 偏光板及び円偏光板 |
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| KR101228997B1 (ko) * | 2008-07-10 | 2013-02-04 | 가부시키가이샤 아데카 | 광학 필름 |
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| WO2017043416A1 (ja) * | 2015-09-09 | 2017-03-16 | 株式会社カネカ | 2,4,6-トリス(2-ヒドロキシ-3-メチル-4-アルコキシフェニル)-1,3,5-トリアジン化合物、及び2,4,6-トリス(2,4-ジヒドロキシ-3-メチルフェニル)-1,3,5-トリアジンの製造方法 |
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| TWI828818B (zh) * | 2018-12-12 | 2024-01-11 | 日商帝人股份有限公司 | 透鏡用熱塑性樹脂及包含其之透鏡 |
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- 2008-12-16 KR KR1020107012450A patent/KR20100108327A/ko not_active Ceased
- 2008-12-16 PL PL08866466T patent/PL2226658T3/pl unknown
- 2008-12-16 CN CN2008801185347A patent/CN101883996A/zh active Pending
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| JP2012201768A (ja) * | 2011-03-24 | 2012-10-22 | Adeka Corp | 蛍光部材被覆用樹脂組成物及びこれを塗布してなる蛍光部材 |
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| JP2016170369A (ja) * | 2015-03-16 | 2016-09-23 | 住友化学株式会社 | 偏光板及び円偏光板 |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2009098701A (ja) | 2009-05-07 |
| PL2226658T3 (pl) | 2018-01-31 |
| TW200949315A (en) | 2009-12-01 |
| KR20100108327A (ko) | 2010-10-06 |
| EP2226658A4 (en) | 2010-12-08 |
| US20100247811A1 (en) | 2010-09-30 |
| TWI592703B (zh) | 2017-07-21 |
| EP2226658A1 (en) | 2010-09-08 |
| CN101883996A (zh) | 2010-11-10 |
| EP2226658B1 (en) | 2017-08-23 |
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