WO2014002929A1 - 偏光板および有機elパネル - Google Patents
偏光板および有機elパネル Download PDFInfo
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- WO2014002929A1 WO2014002929A1 PCT/JP2013/067192 JP2013067192W WO2014002929A1 WO 2014002929 A1 WO2014002929 A1 WO 2014002929A1 JP 2013067192 W JP2013067192 W JP 2013067192W WO 2014002929 A1 WO2014002929 A1 WO 2014002929A1
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- film
- retardation film
- polarizing plate
- polarizer
- organic
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- NUUPJBRGQCEZSI-UHFFFAOYSA-N cyclopentane-1,3-diol Chemical compound OC1CCC(O)C1 NUUPJBRGQCEZSI-UHFFFAOYSA-N 0.000 description 1
- 150000001991 dicarboxylic acids Chemical class 0.000 description 1
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 description 1
- FHESUNXRPBHDQM-UHFFFAOYSA-N diphenyl benzene-1,3-dicarboxylate Chemical compound C=1C=CC(C(=O)OC=2C=CC=CC=2)=CC=1C(=O)OC1=CC=CC=C1 FHESUNXRPBHDQM-UHFFFAOYSA-N 0.000 description 1
- HPGJOUYGWKFYQW-UHFFFAOYSA-N diphenyl benzene-1,4-dicarboxylate Chemical compound C=1C=C(C(=O)OC=2C=CC=CC=2)C=CC=1C(=O)OC1=CC=CC=C1 HPGJOUYGWKFYQW-UHFFFAOYSA-N 0.000 description 1
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical class [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 description 1
- ODCCJTMPMUFERV-UHFFFAOYSA-N ditert-butyl carbonate Chemical compound CC(C)(C)OC(=O)OC(C)(C)C ODCCJTMPMUFERV-UHFFFAOYSA-N 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- IPZIVCLZBFDXTA-UHFFFAOYSA-N ethyl n-prop-2-enoylcarbamate Chemical compound CCOC(=O)NC(=O)C=C IPZIVCLZBFDXTA-UHFFFAOYSA-N 0.000 description 1
- 235000012438 extruded product Nutrition 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229920001477 hydrophilic polymer Polymers 0.000 description 1
- 125000005462 imide group Chemical group 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000003402 intramolecular cyclocondensation reaction Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 125000005395 methacrylic acid group Chemical group 0.000 description 1
- HTEAGOMAXMOFFS-UHFFFAOYSA-N methyl 2-methylprop-2-enoate;prop-2-enoic acid Chemical compound OC(=O)C=C.COC(=O)C(C)=C HTEAGOMAXMOFFS-UHFFFAOYSA-N 0.000 description 1
- 125000001570 methylene group Chemical group [H]C([H])([*:1])[*:2] 0.000 description 1
- SEEYREPSKCQBBF-UHFFFAOYSA-N n-methylmaleimide Chemical compound CN1C(=O)C=CC1=O SEEYREPSKCQBBF-UHFFFAOYSA-N 0.000 description 1
- 125000002560 nitrile group Chemical group 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- JFNLZVQOOSMTJK-KNVOCYPGSA-N norbornene Chemical compound C1[C@@H]2CC[C@H]1C=C2 JFNLZVQOOSMTJK-KNVOCYPGSA-N 0.000 description 1
- 229920000636 poly(norbornene) polymer Polymers 0.000 description 1
- 229920002492 poly(sulfone) Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 150000004291 polyenes Chemical class 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 229920006393 polyether sulfone Polymers 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 239000004926 polymethyl methacrylate Substances 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920006324 polyoxymethylene Polymers 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 229920005749 polyurethane resin Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000000600 sorbitol Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 125000000547 substituted alkyl group Chemical group 0.000 description 1
- 125000005156 substituted alkylene group Chemical group 0.000 description 1
- 125000005717 substituted cycloalkylene group Chemical group 0.000 description 1
- 239000002335 surface treatment layer Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- ZIBGPFATKBEMQZ-UHFFFAOYSA-N triethylene glycol Chemical compound OCCOCCOCCO ZIBGPFATKBEMQZ-UHFFFAOYSA-N 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
Images
Classifications
-
- 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
- H10K59/50—OLEDs integrated with light modulating elements, e.g. with electrochromic elements, photochromic elements or liquid crystal elements
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
- G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
- G02B5/3041—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks
-
- 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
-
- 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
- G02B5/3083—Birefringent or phase retarding elements
-
- 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
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/86—Arrangements for improving contrast, e.g. preventing reflection of ambient light
-
- 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 plate and an organic EL panel.
- the present invention has been made to solve the above-described conventional problems, and a main object thereof is to provide a polarizing plate that achieves an excellent reflection hue.
- the inventors have found that the problem of the reflected hue is the uniformity of the retardation of the retardation film (typically, a stretched film). It has been found that the above object can be achieved by adjusting the optical axis angle between the polarizer and the retardation film, and the present invention has been completed.
- the polarizing plate of the present invention is used in an organic EL panel and includes a polarizer and a retardation film, and the in-plane retardation of the retardation film satisfies a relationship of Re (450) ⁇ Re (550),
- the angle ⁇ formed between the absorption axis of the polarizer and the slow axis of the retardation film satisfies the relationship of 38 ° ⁇ ⁇ ⁇ 44 ° or 46 ° ⁇ ⁇ ⁇ 52 °.
- an optically anisotropic layer is not included between the polarizer and the retardation film.
- the retardation film has an in-plane retardation Re (550) of 130 nm to 160 nm.
- the retardation film has an Nz coefficient of 1.05 to 1.3.
- an organic EL panel is provided. This organic EL panel includes the polarizing plate.
- the angle ⁇ between the polarizer and the retardation film satisfying the relationship of Re (450) ⁇ Re (550) between the absorption axis of the polarizer and the slow axis of the retardation film is 38 ° ⁇
- (A) is a schematic sectional drawing of the polarizing plate by preferable embodiment of this invention
- (b) is a schematic sectional drawing of the polarizing plate by another preferable embodiment of this invention. It is a chromaticity diagram which shows the viewing angle characteristic of the reflective hue of the organic electroluminescent panel of each Example and a comparative example.
- Refractive index (nx, ny, nz) “Nx” is the refractive index in the direction in which the in-plane refractive index is maximum (ie, the slow axis direction), and “ny” is the direction orthogonal to the slow axis in the plane (ie, the fast axis direction). “Nz” is the refractive index in the thickness direction.
- Refractive index (nx, ny, nz) “Nx” is the refractive index in the direction in which the in-plane refractive index is maximum (ie, the slow axis direction), and “ny” is the direction orthogonal to the slow axis in the plane (ie, the fast axis direction). “Nz” is the refractive index in the thickness direction.
- In-plane retardation (Re) “Re (550)” is the in-plane retardation of the film measured with light having a wavelength of 550 nm at 23 ° C.
- Re (450) is the in-plane retardation of the film measured with light having a wavelength of 450 nm at 23 ° C.
- Thickness direction retardation (Rth) is a retardation in the thickness direction of the film measured with light having a wavelength of 550 nm at 23 ° C.
- Rth (450) is a retardation in the thickness direction of the film measured with light having a wavelength of 450 nm at 23 ° C.
- the polarizing plate of the present invention includes a polarizer and a retardation film, and the retardation film is laminated on one side of the polarizer.
- the polarizing plate does not include an optically anisotropic layer (for example, a liquid crystal layer or another retardation film) between the polarizer and the retardation film.
- an optically anisotropic layer for example, a liquid crystal layer or another retardation film
- FIG. 1A is a schematic cross-sectional view of a polarizing plate according to a preferred embodiment of the present invention.
- the polarizing plate 100 of this embodiment includes a polarizer 10, a protective film 20 disposed on one side of the polarizer 10, and a retardation film 30 disposed on the other side of the polarizer 10.
- the retardation film 30 can also function as a protective layer of the polarizer 10. Further, since the polarizer and the retardation film are directly bonded in this manner, a more excellent reflection hue (particularly, viewing angle characteristics) can be achieved.
- FIG. 1B is a schematic cross-sectional view of a polarizing plate according to another preferred embodiment of the present invention.
- the polarizing plate 100 ′ includes a polarizer 10, a first protective film 21 disposed on one side of the polarizer 10, a retardation film 30 disposed on the other side of the polarizer 10, and the retardation of the polarizer 10. And a second protective film 22 disposed between the film 30 and the film 30.
- the second protective film 22 is optically isotropic. When the second protective film is optically isotropic, a more excellent reflection hue (particularly, viewing angle characteristics) can be achieved.
- the retardation film 30 has a relationship of refractive index nx> ny and has a slow axis.
- the polarizer 10 and the retardation film 30 are laminated so that the absorption axis of the polarizer 10 and the slow axis of the retardation film 30 form a predetermined angle.
- the angle ⁇ formed by the absorption axis of the polarizer 10 and the slow axis of the retardation film 30 satisfies the relationship of 38 ° ⁇ ⁇ ⁇ 44 ° or 46 ° ⁇ ⁇ ⁇ 52 °.
- the relationship of 39 ° ⁇ ⁇ ⁇ 43 ° or 47 ° ⁇ ⁇ ⁇ 51 ° is satisfied.
- the thickness of the entire polarizing plate of the present invention varies depending on the configuration, but is typically about 50 ⁇ m to 250 ⁇ m.
- each layer which comprises the polarizing plate of this invention is demonstrated.
- Polarizer Any appropriate polarizer may be adopted as the polarizer.
- Specific examples include hydrophilic polymer films such as polyvinyl alcohol films, partially formalized polyvinyl alcohol films, and ethylene / vinyl acetate copolymer partially saponified films, and dichroic substances such as iodine and dichroic dyes.
- examples thereof include polyene-based oriented films such as those subjected to the dyeing treatment and stretching treatment according to the above, polyvinyl alcohol dehydrated products and polyvinyl chloride dehydrochlorinated products.
- a polarizer obtained by dyeing a polyvinyl alcohol film with iodine and uniaxially stretching is used because of excellent optical properties.
- the dyeing with iodine is performed, for example, by immersing a polyvinyl alcohol film in an aqueous iodine solution.
- the stretching ratio of the uniaxial stretching is preferably 3 to 7 times.
- the stretching may be performed after the dyeing treatment or may be performed while dyeing. Moreover, you may dye
- the polyvinyl alcohol film is subjected to swelling treatment, crosslinking treatment, washing treatment, drying treatment and the like. For example, by immersing a polyvinyl alcohol film in water and washing it before dyeing, not only can the surface of the polyvinyl alcohol film be cleaned and anti-blocking agents can be washed, but the polyvinyl alcohol film can be swollen and dyed. Unevenness can be prevented.
- the thickness of the polarizer is typically about 1 ⁇ m to 80 ⁇ m.
- the retardation film has a refractive index characteristic of nx> ny.
- the in-plane retardation Re (550) of the retardation film is preferably 130 nm to 160 nm, more preferably 135 nm to 155 nm.
- the retardation film shows the wavelength dependency of so-called reverse dispersion.
- the in-plane retardation satisfies the relationship Re (450) ⁇ Re (550).
- Re (450) / Re (550) is preferably 0.94 or less, more preferably 0.92 or less.
- the retardation film shows any appropriate refractive index ellipsoid as long as it has a relationship of nx> ny.
- the refractive index ellipsoid of the retardation film exhibits a relationship of nx> ny ⁇ nz.
- the Nz coefficient of the retardation film is preferably 1.05 to 1.3. By satisfying such a relationship, a more excellent reflection hue (particularly viewing angle characteristics) can be achieved.
- the retardation film is formed of any appropriate resin that can satisfy the optical characteristics.
- the resin forming the retardation film include polycarbonate resin, polyester resin, polyester carbonate resin, polyurethane resin, cellulose resin, polyvinyl acetal resin, acrylic resin, and the like.
- a polycarbonate resin is used.
- the polycarbonate resin can be produced, for example, by a melt polymerization method in which a dihydroxy compound and a carbonic acid diester are reacted.
- the carbonic acid diester include dialkyl carbonates such as diaryl carbonate, dimethyl carbonate, diethyl carbonate, and di-t-butyl carbonate which may have a substituent such as diphenyl carbonate and ditolyl carbonate.
- diaryl carbonate which may have a substituent such as diphenyl carbonate and ditolyl carbonate is preferably used, and diphenyl carbonate is particularly preferably used.
- These carbonic acid diesters may be used alone or in combination of two or more. Carbonic acid diesters may contain impurities such as chloride ions, which may hinder the polymerization reaction or worsen the hue of the resulting polycarbonate resin. It is preferable to use what was done.
- a part of the carbonic acid diester may be substituted with dicarboxylic acid or an ester thereof in an amount of 50 mol% or less, preferably 30 mol% or less.
- dicarboxylic acids or esters thereof include terephthalic acid, isophthalic acid, diphenyl terephthalate, and diphenyl isophthalate.
- the polycarbonate resin may be referred to as a polyester carbonate resin.
- the polycarbonate resin of the present embodiment can be produced by, for example, a melt polymerization method in which a dihydroxy compound and a carbonic acid diester are reacted.
- a polycarbonate resin can be usually produced. Any compound can be used, but at least one of the dihydroxy compounds is preferably a dihydroxy compound having an etheric oxygen atom in at least one ⁇ -position or ⁇ -position of the carbon atom bonded to the hydroxy group.
- the “etheric oxygen atom” in the dihydroxy compound of the present embodiment means that the oxygen atom is single-bonded with two carbons, and is distinguished from the oxygen atom constituting the hydroxyl group or carbonyl group.
- the ⁇ -position and ⁇ -position are the carbon atoms bonded to the hydroxy group in the dihydroxy compound.
- the position of the adjacent carbon atom is ⁇ -position
- the adjacent carbon atom is ⁇ -position
- the adjacent carbon atom is ⁇ -position.
- the carbon atom corresponding to the ⁇ -position is an etheric oxygen atom based on the carbon atom bonded to the hydroxy group
- the ⁇ -position of the carbon atom bonded to the hydroxy group is Corresponds to “aliphatic dihydroxy compound having an etheric oxygen atom”.
- the etheric oxygen atom is preferably a part of the structure represented by the following formula (1), specifically, at least bonded to a methylene group.
- the dihydroxy compound having an etheric oxygen atom is preferably a dihydroxy compound represented by the following formula (2).
- R 1 to R 4 are each independently a hydrogen atom, an optionally substituted alkyl group having 1 to 20 carbon atoms, or an optionally substituted carbon. It represents a cycloalkyl group having 6 to 20 carbon atoms or an aryl group having 6 to 20 carbon atoms which may have a substituent.
- a plurality of R 1 to R 4 may be present independently for each ring.
- X 1 and X 2 are each an optionally substituted alkylene group having 2 to 10 carbon atoms, an optionally substituted cycloalkylene group having 6 to 20 carbon atoms, or Represents an arylene group having 6 to 20 carbon atoms which may have a substituent.
- the dihydroxy compound having an etheric oxygen atom is preferably a dihydroxy compound represented by the following formula (3).
- R 7 represents a substituted or unsubstituted alkylene group having 2 to 10 carbon atoms, and p is an integer of 2 to 100.
- Examples of other dihydroxy compounds having an etheric oxygen atom include compounds having a cyclic ether structure.
- the compound preferably has a plurality of etheric oxygen atoms, and preferably has a plurality of cyclic structures.
- a compound having a plurality of cyclic ether structures is more preferable. More specifically, compounds having a cyclic ether structure as represented by the following formulas (4) and (5) are exemplified.
- dihydroxy compound represented by the above formula (4) examples include isosorbide, isomannide, and isoide which have a stereoisomeric relationship.
- isosorbide obtained by dehydrating condensation of sorbitol produced from various starches that are abundant as resources and are readily available is easy to obtain and manufacture, optical properties, moldability From the viewpoint of
- ⁇ Dihydroxy compound represented by the formula (2)> As the dihydroxy compound represented by the general formula (2), more specifically, 9,9-bis (4- (2-hydroxyethoxy) phenyl) fluorene, 9,9-bis (4- (2-hydroxy) Ethoxy) -3-methylphenyl) fluorene, 9,9-bis (4- (2-hydroxyethoxy) -3-isopropylphenyl) fluorene, 9,9-bis (4- (2-hydroxyethoxy) -3-isobutyl Phenyl) fluorene, 9,9-bis (4- (2-hydroxyethoxy) -3-tert-butylphenyl) fluorene, 9,9-bis (4- (2-hydroxyethoxy) -3-cyclohexylphenyl) fluorene, 9,9-bis (4- (2-hydroxyethoxy) -3-phenylphenyl) fluorene, 9,9-bis (4- (2-hydroxy Toxi) -3,5-dimethylphenyl) fluor
- dihydroxy compound represented by Formula (3) Specific examples of the dihydroxy compound represented by the formula (3) include oxyalkylene glycols such as diethylene glycol, triethylene glycol, tetraethylene glycol, and polyethylene glycol (molecular weight 150 to 2000). Of these, diethylene glycol or polyethylene glycol is preferred.
- the dihydroxy compound having an etheric oxygen atom may be used alone or in combination of two or more depending on the required performance of the obtained polycarbonate resin.
- the polycarbonate resin is a structural unit derived from a dihydroxy compound represented by formula (2), a structural unit derived from a dihydroxy compound represented by formula (3), and a formula (4). It is preferable that the structural unit derived from the dihydroxy compound represented is included.
- ⁇ Dihydroxy compounds other than dihydroxy compounds having an etheric oxygen atom ⁇ Dihydroxy compounds other than dihydroxy compounds having an etheric oxygen atom>
- the polycarbonate resin of this embodiment is produced by a melt polymerization method in which a dihydroxy compound and a carbonic acid diester are reacted, for example, in order to increase the toughness of a film produced from the obtained resin, the dihydroxy having the etheric oxygen atom is used. It is preferable to use a dihydroxy compound other than the compound in combination.
- the dihydroxy compound other than the dihydroxy compound having an etheric oxygen atom is selected from the group consisting of a dihydroxy compound represented by the following formula (6) and a dihydroxy compound represented by the following formula (7).
- a dihydroxy compound represented by the following formula (6) represents a substituted or unsubstituted monocyclic cycloalkylene group having 4 to 20 carbon atoms.
- R 6 represents a substituted or unsubstituted monocyclic cycloalkylene group having 4 to 20 carbon atoms.
- Examples of the dihydroxy compound represented by the general formula (6) include a compound containing a monocyclic cycloalkylene group (an alicyclic dihydroxy compound). By setting it as a monocyclic structure, the toughness when the polycarbonate resin obtained is used as a film can be improved.
- Representative examples of the alicyclic dihydroxy compound include compounds having a 5-membered ring structure or a 6-membered ring structure. By being a 5-membered ring structure or a 6-membered ring structure, the heat resistance of the obtained polycarbonate resin can be increased.
- the six-membered ring structure may be fixed in a chair shape or a boat shape by a covalent bond.
- the dihydroxy compound represented by the general formula (6) may be used alone or in combination of two or more.
- ⁇ Dihydroxy compound represented by the general formula (7) examples include a compound containing a monocyclic cycloalkylene group (an alicyclic dihydroxy compound). By setting it as a monocyclic structure, the toughness when the polycarbonate resin obtained is used as a film can be improved.
- R 6 in the general formula (7) is represented by the following general formula (Ia) (wherein R 7 is a hydrogen atom or a substituted or unsubstituted carbon number of 1 to carbon atoms). Represents an alkyl group of 12)).
- Such isomers include 1,2-cyclohexanedimethanol, 1,3-cyclohexanedimethanol, 1,4-cyclohexanedimethanol and the like. These are easily available and excellent in handleability.
- the dihydroxy compound represented by the general formula (7) may be used alone or in combination of two or more.
- the compound illustrated above regarding the dihydroxy compound represented by general formula (6) and (7) is an example of the alicyclic dihydroxy compound which can be used, and is not limited to these at all.
- the polycarbonate resin of this embodiment may further contain a structural unit derived from another dihydroxy compound.
- dihydroxy compounds include 9,9-bis (4-hydroxyphenyl) fluorene, 9,9-bis (4-hydroxy-3-methylphenyl) fluorene, and 9,9-bis (4-hydroxy-3).
- bisphenols etc. are mentioned, for example.
- the structural unit derived from the dihydroxy compound having an etheric oxygen atom is 18 mol% or more, preferably 20 mol% or more, and more preferably 25 mol% or more. If the structural unit is too small, the wavelength dependence of reverse dispersion may not be obtained.
- the dihydroxy compound represented by the general formula (3), the dihydroxy compound represented by the general formula (4), the dihydroxy compound represented by the general formula (5), and the dihydroxy represented by the general formula (6) The structural unit derived from one or more dihydroxy compounds selected from the group consisting of compounds is preferably 25 mol% or more, more preferably 30 mol% or more, and still more preferably 35 mol% or more in the polycarbonate resin. It is. If the number of structural units is too small, the toughness of the film may be poor.
- the glass transition temperature of the polycarbonate resin is preferably 110 ° C. or higher and 150 ° C. or lower, more preferably 120 ° C. or higher and 140 ° C. or lower. If the glass transition temperature is excessively low, the heat resistance tends to deteriorate, there is a possibility of causing a dimensional change after film formation, and the image quality of the resulting organic EL panel may be lowered. If the glass transition temperature is excessively high, the molding stability at the time of film molding may deteriorate, and the transparency of the film may be impaired.
- the glass transition temperature is determined according to JIS K 7121 (1987).
- the molecular weight of the polycarbonate resin can be represented by a reduced viscosity.
- the reduced viscosity is measured using a Ubbelohde viscometer at a temperature of 20.0 ° C. ⁇ 0.1 ° C., using methylene chloride as a solvent, precisely adjusting the polycarbonate concentration to 0.6 g / dL.
- the lower limit of the reduced viscosity is usually preferably 0.30 dL / g, more preferably 0.35 dL / g or more.
- the upper limit of the reduced viscosity is usually preferably 1.20 dL / g, more preferably 1.00 dL / g, still more preferably 0.80 dL / g.
- the reduced viscosity is less than the lower limit, there may be a problem that the mechanical strength of the molded product is reduced.
- the reduced viscosity is larger than the upper limit, the fluidity at the time of molding is lowered, and there may be a problem that productivity and moldability are lowered.
- the retardation film is typically produced by stretching a resin film in at least one direction.
- any appropriate method can be adopted as a method for forming the resin film.
- a melt extrusion method for example, a T-die molding method
- a cast coating method for example, a casting method
- a calendar molding method for example, a hot press method, a co-extrusion method, a co-melting method, a multilayer extrusion method, an inflation molding method, etc. It is done.
- a T-die molding method, a casting method, and an inflation molding method are used.
- the thickness of the resin film can be set to any appropriate value depending on desired optical characteristics, stretching conditions described later, and the like.
- the thickness is preferably 50 ⁇ m to 300 ⁇ m.
- Any appropriate stretching method and stretching conditions may be employed for the stretching.
- various stretching methods such as free end stretching, fixed end stretching, free end contraction, and fixed end contraction can be used singly or simultaneously or sequentially.
- the stretching direction can also be performed in various directions and dimensions such as a horizontal direction, a vertical direction, a thickness direction, and a diagonal direction.
- the stretching temperature is preferably Tg-30 ° C. to Tg + 60 ° C., more preferably Tg-10 ° C. to Tg + 50 ° C. with respect to the glass transition temperature (Tg) of the resin film.
- a retardation film having the desired optical properties (for example, refractive index ellipsoid, in-plane retardation, Nz coefficient) can be obtained by appropriately selecting the stretching method and stretching conditions.
- the retardation film is produced by uniaxially stretching a resin film or uniaxially stretching a fixed end.
- the fixed end uniaxial stretching there is a method of stretching in the width direction (lateral direction) while running the resin film in the longitudinal direction.
- the draw ratio is preferably 110% to 350%.
- the retardation film is produced by continuously stretching a long resin film obliquely in the direction of the angle ⁇ with respect to the long direction.
- a long stretched film having an orientation angle of an angle ⁇ with respect to the longitudinal direction of the film can be obtained.
- roll-to-roll is possible when laminating with a polarizer, and the manufacturing process Can be simplified.
- Examples of the stretching machine used for the oblique stretching include a tenter type stretching machine capable of adding feed forces, pulling forces, or pulling forces at different speeds in the lateral and / or longitudinal directions.
- the tenter type stretching machine includes a horizontal uniaxial stretching machine, a simultaneous biaxial stretching machine, and the like, but any suitable stretching machine can be used as long as a long resin film can be continuously stretched obliquely.
- the thickness of the retardation film is preferably 20 ⁇ m to 100 ⁇ m, more preferably 30 ⁇ m to 80 ⁇ m, and still more preferably 30 ⁇ m to 65 ⁇ m.
- the said protective film is formed with arbitrary appropriate films which can be used as a protective layer of a polarizer.
- the material as the main component of the film include cellulose resins such as triacetyl cellulose (TAC), polyester-based, polyvinyl alcohol-based, polycarbonate-based, polyamide-based, polyimide-based, polyethersulfone-based, and polysulfone-based materials.
- transparent resins such as polystyrene, polynorbornene, polyolefin, (meth) acryl, and acetate.
- thermosetting resins such as (meth) acrylic, urethane-based, (meth) acrylurethane-based, epoxy-based, and silicone-based or ultraviolet curable resins are also included.
- a glassy polymer such as a siloxane polymer is also included.
- a polymer film described in JP-A-2001-343529 (WO01 / 37007) can also be used.
- a resin composition containing a thermoplastic resin having a substituted or unsubstituted imide group in the side chain and a thermoplastic resin having a substituted or unsubstituted phenyl group and nitrile group in the side chain for example, a resin composition having an alternating copolymer of isobutene and N-methylmaleimide and an acrylonitrile / styrene copolymer can be mentioned.
- the polymer film can be, for example, an extruded product of the resin composition.
- Tg glass transition temperature
- Tg glass transition temperature
- the upper limit of Tg of the said (meth) acrylic-type resin is not specifically limited, From viewpoints of a moldability etc., Preferably it is 170 degrees C or less.
- poly (meth) acrylate such as polymethyl methacrylate, methyl methacrylate- (meth) acrylic acid copolymer, methyl methacrylate- (meth) acrylic acid ester copolymer, methyl methacrylate-acrylic acid ester -(Meth) acrylic acid copolymer, (meth) acrylic acid methyl-styrene copolymer (MS resin, etc.), polymer having alicyclic hydrocarbon group (for example, methyl methacrylate-cyclohexyl methacrylate copolymer) And methyl methacrylate- (meth) acrylate norbornyl copolymer).
- poly (meth) acrylate such as polymethyl methacrylate, methyl methacrylate- (meth) acrylic acid copolymer, methyl methacrylate- (meth) acrylic acid ester copolymer, methyl methacrylate-acrylic acid ester -(Meth) acrylic acid copolymer, (meth) acrylic acid
- poly (meth) acrylate C 1-6 alkyl such as poly (meth) acrylate methyl is used. More preferred is a methyl methacrylate resin containing methyl methacrylate as a main component (50 to 100% by weight, preferably 70 to 100% by weight).
- the (meth) acrylic resin examples include, for example, Acrypet VH and Acrypet VRL20A manufactured by Mitsubishi Rayon Co., Ltd. and a (meth) acrylic resin having a ring structure in the molecule described in JP-A-2004-70296.
- the resin examples include high Tg (meth) acrylic resins obtained by intramolecular crosslinking or intramolecular cyclization reaction.
- a (meth) acrylic resin having a lactone ring structure is particularly preferable in that it has high heat resistance, high transparency, and high mechanical strength.
- Examples of the (meth) acrylic resin having the lactone ring structure include JP 2000-230016, JP 2001-151814, JP 2002-120326, JP 2002-254544, and JP 2005. Examples thereof include (meth) acrylic resins having a lactone ring structure described in JP-A-146084.
- the (meth) acrylic resin having a lactone ring structure has a mass average molecular weight (sometimes referred to as a weight average molecular weight), preferably 1,000 to 2,000,000, more preferably 5,000 to 1,000,000, still more preferably 10,000 to 500,000. Preferably it is 50,000 to 500,000.
- the (meth) acrylic resin having a lactone ring structure has a Tg (glass transition temperature) of preferably 115 ° C. or higher, more preferably 125 ° C. or higher, still more preferably 130 ° C. or higher, particularly preferably 135 ° C., most preferably. Is 140 ° C. or higher. It is because it can be excellent in durability.
- the upper limit of Tg of the (meth) acrylic resin having the lactone ring structure is not particularly limited, but is preferably 170 ° C. or less from the viewpoint of moldability and the like.
- (meth) acrylic refers to acrylic and / or methacrylic.
- the protective film 20 (first protective film 21) disposed on the opposite side of the retardation film with respect to the polarizer has a surface such as a hard coat treatment, an antireflection treatment, an antisticking treatment, and an antiglare treatment as necessary. Processing may be performed.
- the thickness of the protective film (first protective film) is typically 5 mm or less, preferably 1 mm or less, more preferably 1 ⁇ m to 500 ⁇ m, and even more preferably 5 ⁇ m to 150 ⁇ m.
- the thickness of the second protective film is preferably 5 ⁇ m to 200 ⁇ m, more preferably 10 ⁇ m to 100 ⁇ m, and still more preferably 15 ⁇ m to 95 ⁇ m.
- the pressure-sensitive adhesive layer is typically formed of an acrylic pressure-sensitive adhesive.
- the adhesive layer is typically formed of a polyvinyl alcohol-based adhesive.
- an adhesive layer may be provided on the retardation film 30 side of the polarizing plates 100 and 100 '.
- the pressure-sensitive adhesive layer By providing the pressure-sensitive adhesive layer in advance, it can be easily bonded to another optical member (for example, an organic EL panel).
- the peeling film is bonded together on the surface of this adhesive layer until it uses.
- the organic EL panel of the present invention includes the polarizing plate on the viewing side.
- the polarizing plate is laminated so that the retardation film is on the organic EL panel side (so that the polarizer is on the viewing side).
- the present invention will be specifically described by way of examples, but the present invention is not limited to these examples.
- the measuring method of each characteristic is as follows.
- Thickness The thickness was measured using a dial gauge (manufactured by PEACOCK, product name “DG-205”, dial gauge stand (product name “pds-2”)).
- Phase difference It measured using Axoscan made from Axometrics. The measurement wavelength was 450 nm, 550 nm, and the measurement temperature was 23 ° C.
- the film piece of 50 mm x 50 mm was cut out from the retardation film, and it was set as the measurement sample.
- Orientation angle The measurement sample was placed in parallel on an Axoscan measuring table manufactured by Axometrics, and the orientation angle of the retardation film was measured.
- the film piece of 50 mm x 50 mm was cut out from the phase difference film, and it was set as the measurement sample. In that case, it cut out so that one side of a film piece might become parallel to the elongate direction of a elongate phase difference film.
- Reflected hue and reflectance A black image was displayed on the obtained organic EL panel, and the reflected hue and reflectance were measured using a spectrocolorimeter “CM-2600d” manufactured by Konica Minolta.
- Example 1 (Production of polycarbonate resin film) Isosorbide (ISB) 26.2 parts by mass, 9,9- [4- (2-hydroxyethoxy) phenyl] fluorene (BHEPF) 100.5 parts by mass, 1,4-cyclohexanedimethanol (1,4-CHDM) 10 7 parts by mass, 105.1 parts by mass of diphenyl carbonate (DPC), and 0.591 parts by mass of cesium carbonate (0.2% by mass aqueous solution) as a catalyst were each put into a reaction vessel and reacted in a nitrogen atmosphere.
- the heating medium temperature in the reaction vessel was set to 150 ° C., and the raw materials were dissolved while stirring as necessary (about 15 minutes).
- the pressure in the reaction vessel was changed from normal pressure to 13.3 kPa, and the generated phenol was extracted out of the reaction vessel while the temperature of the heat medium in the reaction vessel was increased to 190 ° C. over 1 hour.
- the pressure in the reaction vessel is set to 6.67 kPa, and the heat medium temperature of the reaction vessel is increased to 230 ° C. in 15 minutes.
- the generated phenol was extracted out of the reaction vessel. Since the stirring torque of the stirrer increased, the temperature was raised to 250 ° C. in 8 minutes, and the pressure in the reaction vessel was reduced to 0.200 kPa or less in order to remove the generated phenol.
- the obtained polycarbonate resin A had a glass transition temperature of 136.6 ° C. and a reduced viscosity of 0.395 dL / g.
- the obtained polycarbonate resin A was vacuum-dried at 80 ° C. for 5 hours, and then a single-screw extruder (manufactured by Isuzu Chemical Industries, screw diameter 25 mm, cylinder setting temperature: 220 ° C.), T die (width 200 mm, setting temperature: A polycarbonate resin film having a thickness of 120 ⁇ m was prepared using a film forming apparatus equipped with a chill roll (set temperature: 120 to 130 ° C.) and a winder.
- the obtained polycarbonate resin film was horizontally stretched using a tenter stretching machine to obtain a retardation film having a thickness of 50 ⁇ m. At that time, the draw ratio was 250%, and the draw temperature was 137 to 139 ° C.
- Re (550) of the obtained retardation film is 137 to 147 nm, Re (450) / Re (550) is 0.89, Nz coefficient is 1.21, and the orientation angle is in the longitudinal direction. The angle was 90 °.
- Polarizing film having a configuration of the obtained retardation film and a protective film with a surface treatment layer (thickness 45 ⁇ m) / polarizer / protective film (thickness 20 ⁇ m, Re (550): 0 nm, Rth (550): 0 nm)
- An acrylic pressure-sensitive adhesive was applied to one side of a product name “CVS1775SDUHC” manufactured by Nitto Denko Corporation.
- the retardation film was cut into a size of 100 mm ⁇ 50 mm with the adhesive surface facing up. When cutting, adjustment was made so that the direction of 41 ° counterclockwise with respect to the long side direction was the slow axis direction. Similarly, the polarizing film was cut out so that the long side direction was the absorption axis direction.
- a retardation film was bonded to the adhesive surface of the cut out polarizing film to obtain a 100 mm ⁇ 50 mm polarizing plate.
- the organic EL panel is taken out from the organic EL display (product name “15EL9500” manufactured by LG), the polarizing film attached to the organic EL panel is peeled off, and the obtained polarizing plate is bonded to the organic EL display instead. An EL panel was obtained.
- the results of the front hue and front reflectance of this organic EL panel are shown in Table 1, and the viewing angle characteristics of the reflected hue (change in hue in the front direction and polar angle 45 °, azimuth angle 45 ° to 135 ° direction) are shown in FIG. Show.
- Example 2 In the production of the polarizing plate, in the same manner as in Example 1 except that when the retardation film was cut out, the direction of 43 ° counterclockwise with respect to the long side direction was adjusted to be the slow axis direction. An organic EL panel was produced. The results of the front hue and front reflectance of this organic EL panel are shown in Table 1, and the viewing angle characteristics of the reflected hue (change in hue in the front direction and polar angle 45 °, azimuth angle 45 ° to 135 ° direction) are shown in FIG. Show.
- Example 3 In the production of the polarizing plate, in the same manner as in Example 1 except that when the retardation film was cut out, the direction of 38 ° counterclockwise with respect to the long side direction was adjusted to be the slow axis direction. An organic EL panel was produced. The results of the front hue and front reflectance of this organic EL panel are shown in Table 1, and the viewing angle characteristics of the reflected hue (change in hue in the front direction and polar angle 45 °, azimuth angle 45 ° to 135 ° direction) are shown in FIG. Show.
- Example 1 In the production of the polarizing plate, when the retardation film was cut out, the same procedure as in Example 1 was performed except that the direction of 45 ° counterclockwise with respect to the long side direction was adjusted to the slow axis direction. An organic EL panel was produced. The results of the front hue and front reflectance of this organic EL panel are shown in Table 1, and the viewing angle characteristics of the reflected hue (change in hue in the front direction and polar angle 45 °, azimuth angle 45 ° to 135 ° direction) are shown in FIG. Show.
- Example 3 An organic EL panel was produced in the same manner as in Example 2 except that the following film was used as the retardation film.
- the results of the front hue and front reflectance of this organic EL panel are shown in Table 1, and the viewing angle characteristics of the reflected hue (change in hue in the front direction and polar angle 45 °, azimuth angle 45 ° to 135 ° direction) are shown in FIG. Show.
- each example had a smaller change in reflected hue due to a viewing angle than each comparative example, and was excellent in viewing angle characteristics.
- the polarizing plate of the present invention is suitably used for an organic EL device.
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Abstract
Description
好ましい実施形態においては、上記偏光子と上記位相差フィルムとの間に光学異方性層を含まない。
好ましい実施形態においては、上記位相差フィルムの面内位相差Re(550)が130nm~160nmである。
好ましい実施形態においては、上記位相差フィルムのNz係数が1.05~1.3である。
本発明の別の局面によれば、有機ELパネルが提供される。この有機ELパネルは、上記偏光板を備える。
本明細書における用語および記号の定義は下記の通りである。
(1)屈折率(nx、ny、nz)
「nx」は面内の屈折率が最大になる方向(すなわち、遅相軸方向)の屈折率であり、「ny」は面内で遅相軸と直交する方向(すなわち、進相軸方向)の屈折率であり、「nz」は厚み方向の屈折率である。
(2)面内位相差(Re)
「Re(550)」は、23℃における波長550nmの光で測定したフィルムの面内位相差である。Re(550)は、フィルムの厚みをd(nm)としたとき、式:Re=(nx-ny)×dによって求められる。なお、「Re(450)」は、23℃における波長450nmの光で測定したフィルムの面内位相差である。
(3)厚み方向の位相差(Rth)
「Rth(550)」は、23℃における波長550nmの光で測定したフィルムの厚み方向の位相差である。Rth(550)は、フィルムの厚みをd(nm)としたとき、式:Rth=(nx-nz)×dによって求められる。なお、「Rth(450)」は、23℃における波長450nmの光で測定したフィルムの厚み方向の位相差である。
(4)Nz係数
Nz係数は、Nz=Rth/Reによって求められる。
本発明の偏光板は、偏光子と位相差フィルムとを備え、偏光子の片側に位相差フィルムが積層されている。好ましくは、偏光板は、偏光子と位相差フィルムとの間には光学異方性層(例えば、液晶層や別の位相差フィルム)を含まない。以下、具体例について説明する。
上記偏光子としては、任意の適切な偏光子が採用され得る。具体例としては、ポリビニルアルコール系フィルム、部分ホルマール化ポリビニルアルコール系フィルム、エチレン・酢酸ビニル共重合体系部分ケン化フィルム等の親水性高分子フィルムに、ヨウ素や二色性染料等の二色性物質による染色処理および延伸処理が施されたもの、ポリビニルアルコールの脱水処理物やポリ塩化ビニルの脱塩酸処理物等ポリエン系配向フィルム等が挙げられる。好ましくは、光学特性に優れることから、ポリビニルアルコール系フィルムをヨウ素で染色し一軸延伸して得られた偏光子が用いられる。
上記位相差フィルムは、上述のとおり、屈折率特性がnx>nyの関係を示す。位相差フィルムの面内位相差Re(550)は、好ましくは130nm~160nm、より好ましくは135nm~155nmである。
前記一般式(2)で表されるジヒドロキシ化合物として、より具体的には、9,9-ビス(4-(2-ヒドロキシエトキシ)フェニル)フルオレン、9,9-ビス(4-(2-ヒドロキシエトキシ)-3-メチルフェニル)フルオレン、9,9-ビス(4-(2-ヒドロキシエトキシ)-3-イソプロピルフェニル)フルオレン、9,9-ビス(4-(2-ヒドロキシエトキシ)-3-イソブチルフェニル)フルオレン、9,9-ビス(4-(2-ヒドロキシエトキシ)-3-tert-ブチルフェニル)フルオレン、9,9-ビス(4-(2-ヒドロキシエトキシ)-3-シクロヘキシルフェニル)フルオレン、9,9-ビス(4-(2-ヒドロキシエトキシ)-3-フェニルフェニル)フルオレン、9,9-ビス(4-(2-ヒドロキシエトキシ)-3,5-ジメチルフェニル)フルオレン、9,9-ビス(4-(2-ヒドロキシエトキシ)-3-tert-ブチル-6-メチルフェニル)フルオレン、9,9-ビス(4-(3-ヒドロキシ-2,2-ジメチルプロポキシ)フェニル)フルオレン等の式(2)で代表される、芳香族基に結合したエーテル性酸素原子を有する化合物が挙げられる。
前記式(3)で表されるジヒドロキシ化合物としては、具体的には、ジエチレングルコール、トリエチレングリコール、テトラエチレングリコール、ポリエチレングリコール(分子量150~2000)などのオキシアルキレングリコール類が挙げられ、その中でもジエチレングリコール又はポリエチレングリコールが好ましい。
本実施形態のポリカーボネート樹脂を、ジヒドロキシ化合物と炭酸ジエステルとを反応させる溶融重合法により製造する際には、例えば得られる樹脂から作製されるフィルムの靭性を高めるため、前記エーテル性酸素原子を有するジヒドロキシ化合物以外のジヒドロキシ化合物を併用することが好ましい。
前記一般式(6)で表されるジヒドロキシ化合物としては、単環構造のシクロアルキレン基を含む化合物(脂環式ジヒドロキシ化合物)が挙げられる。単環構造とすることにより、得られるポリカーボネート樹脂をフィルムとしたときの靭性を改良することが出来る。脂環式ジヒドロキシ化合物の代表例としては、5員環構造又は6員環構造を含む化合物が挙げられる。5員環構造又は6員環構造であることにより、得られるポリカーボネート樹脂の耐熱性を高くすることができる。6員環構造は共有結合によって椅子形もしくは舟形に固定されていてもよい。具体的には、1,2-シクロペンタンジオール、1,3-シクロペンタンジオール、1,2-シクロヘキサンジオール、1,3-シクロヘキサンジオール、1,4-シクロヘキサンジオール、2-メチル-1,4-シクロヘキサンジオール等が挙げられる。一般式(6)で表されるジヒドロキシ化合物は、単独で用いてもよく、2種以上を組み合わせて用いてもよい。
前記一般式(7)で表されるジヒドロキシ化合物としては、単環構造のシクロアルキレン基を含む化合物(脂環式ジヒドロキシ化合物)が挙げられる。単環構造とすることにより、得られるポリカーボネート樹脂をフィルムとしたときの靭性を改良することが出来る。脂環式ジヒドロキシ化合物の代表例としては、前記一般式(7)におけるR6が下記一般式(Ia)(式中、R7は水素原子、又は、置換若しくは無置換の炭素数1~炭素数12のアルキル基を表す。)で示される種々の異性体が挙げられる。このような異性体の好ましい具体例としては、1,2-シクロヘキサンジメタノール、1,3-シクロヘキサンジメタノール、1,4-シクロヘキサンジメタノール等が挙げられる。これらは、入手が容易で、かつ、取扱い性に優れる。一般式(7)で表されるジヒドロキシ化合物は、単独で用いてもよく、2種以上を組み合わせて用いてもよい。
また、例えば、ビスフェノール類等も挙げられる。ビスフェノール類としては、例えば、2,2-ビス(4-ヒドロキシフェニル)プロパン[=ビスフェノールA]、2,2-ビス(4-ヒドロキシ-3,5-ジメチルフェニル)プロパン、2,2-ビス(4-ヒドロキシ-3,5-ジエチルフェニル)プロパン、2,2-ビス(4-ヒドロキシ-(3,5-ジフェニル)フェニル)プロパン、2,2-ビス(4-ヒドロキシ-3,5-ジブロモフェニル)プロパン、2,2-ビス(4-ヒドロキシフェニル)ペンタン、2,4’-ジヒドロキシ-ジフェニルメタン、ビス(4-ヒドロキシフェニル)メタン、ビス(4-ヒドロキシ-5-ニトロフェニル)メタン、1,1-ビス(4-ヒドロキシフェニル)エタン、3,3-ビス(4-ヒドロキシフェニル)ペンタン、1,1-ビス(4-ヒドロキシフェニル)シクロヘキサン、ビス(4-ヒドロキシフェニル)スルホン、2,4’-ジヒドロキシジフェニルスルホン、ビス(4-ヒドロキシフェニル)スルフィド、4,4’-ジヒドロキシジフェニルエーテル、4,4’-ジヒドロキシ-3,3’-ジクロロジフェニルエーテル、4,4’-ジヒドロキシ-2,5-ジエトキシジフェニルエーテル等が挙げられる。
上記保護フィルムは、偏光子の保護層として使用できる任意の適切なフィルムで形成される。当該フィルムの主成分となる材料の具体例としては、トリアセチルセルロース(TAC)等のセルロース系樹脂や、ポリエステル系、ポリビニルアルコール系、ポリカーボネート系、ポリアミド系、ポリイミド系、ポリエーテルスルホン系、ポリスルホン系、ポリスチレン系、ポリノルボルネン系、ポリオレフィン系、(メタ)アクリル系、アセテート系等の透明樹脂等が挙げられる。また、(メタ)アクリル系、ウレタン系、(メタ)アクリルウレタン系、エポキシ系、シリコーン系等の熱硬化型樹脂または紫外線硬化型樹脂等も挙げられる。この他にも、例えば、シロキサン系ポリマー等のガラス質系ポリマーも挙げられる。また、特開2001-343529号公報(WO01/37007)に記載のポリマーフィルムも使用できる。このフィルムの材料としては、例えば、側鎖に置換または非置換のイミド基を有する熱可塑性樹脂と、側鎖に置換または非置換のフェニル基ならびにニトリル基を有する熱可塑性樹脂を含有する樹脂組成物が使用でき、例えば、イソブテンとN-メチルマレイミドからなる交互共重合体と、アクリロニトリル・スチレン共重合体とを有する樹脂組成物が挙げられる。当該ポリマーフィルムは、例えば、上記樹脂組成物の押出成形物であり得る。
本発明の偏光板を構成する各層の積層には、任意の適切な粘着剤層または接着剤層が用いられる。粘着剤層は、代表的にはアクリル系粘着剤で形成される。接着剤層は、代表的にはポリビニルアルコール系接着剤で形成される。
本発明の有機ELパネルは、その視認側に上記偏光板を備える。偏光板は、位相差フィルムが有機ELパネル側となるように(偏光子が視認側となるように)積層されている。
ダイヤルゲージ(PEACOCK社製、製品名「DG-205」、ダイヤルゲージスタンド(製品名「pds-2」))を用いて測定した。
(2)位相差
Axometrics社製のAxoscanを用いて測定した。測定波長は450nm、550nm、測定温度は23℃であった。なお、位相差フィルムから50mm×50mmのフィルム片を切り出して、測定サンプルとした。
(3)配向角
Axometrics社製のAxoscanの測定台に測定サンプルを平行に置き、位相差フィルムの配向角を測定した。なお、位相差フィルムから50mm×50mmのフィルム片を切り出して、測定サンプルとした。その際、フィルム片の一辺が、長尺状の位相差フィルムの長尺方向と平行となるように切り出した。
(4)反射色相および反射率
得られた有機ELパネルに黒画像を表示させ、コニカミノルタ社製の分光測色計「CM-2600d」を用いて反射色相および反射率を測定した。なお、正面色相の変化Δxyは、位相差フィルムの面内位相差Reを137~147nmの範囲で変化させたときの色度図上での移動距離を示し、ニュートラル色相からの距離は、色度図上、(x,y)=(0.33,0.329)からの距離を示す。
(ポリカーボネート樹脂フィルムの作製)
イソソルビド(ISB)26.2質量部、9,9-[4-(2-ヒドロキシエトキシ)フェニル]フルオレン(BHEPF)100.5質量部、1,4-シクロヘキサンジメタノール(1,4-CHDM)10.7質量部、ジフェニルカーボネート(DPC)105.1質量部、および、触媒として炭酸セシウム(0.2質量%水溶液)0.591質量部をそれぞれ反応容器に投入し、窒素雰囲気下にて、反応の第1段目の工程として、反応容器の熱媒温度を150℃にし、必要に応じて攪拌しながら、原料を溶解させた(約15分)。
反応容器内温度を190℃で15分保持した後、第2段目の工程として、反応容器内の圧力を6.67kPaとし、反応容器の熱媒温度を230℃まで、15分で上昇させ、発生するフェノールを反応容器外へ抜き出した。攪拌機の攪拌トルクが上昇してくるので、8分で250℃まで昇温し、さらに発生するフェノールを取り除くため、反応容器内の圧力を0.200kPa以下に減圧した。所定の攪拌トルクに到達後、反応を終了し、生成した反応物を水中に押し出した後に、ペレット化を行い、BHEPF/ISB/1,4-CHDM=47.4モル%/37.1モル%/15.5モル%のポリカーボネート樹脂Aを得た。
得られたポリカーボネート樹脂Aのガラス転移温度は136.6℃であり、還元粘度は0.395dL/gであった。
テンター延伸機を用いて、得られたポリカーボネート樹脂フィルムを横延伸し、厚み50μmの位相差フィルムを得た。その際、延伸倍率は250%であり、延伸温度を137~139℃とした。
得られた位相差フィルムのRe(550)は137~147nmであり、Re(450)/Re(550)は0.89であり、Nz係数は1.21であり、配向角は長尺方向に対し90°であった。
得られた位相差フィルム、および、表面処理層付保護フィルム(厚み45μm)/偏光子/保護フィルム(厚み20μm、Re(550):0nm、Rth(550):0nm)の構成を有する偏光フィルム(日東電工株式会社製、製品名「CVS1775SDUHC」)の片側に、アクリル系粘着剤を塗工した。
粘着面を上にした状態で位相差フィルムを100mm×50mmの大きさに切り出した。切り出す際、長辺方向に対し、反時計回りに41°の方向が遅相軸方向となるように調整した。同様にして、偏光フィルムも長辺方向が吸収軸方向となるように切り出した。
切り出した偏光フィルムの粘着面に、位相差フィルムを貼り合わせ、100mm×50mmの偏光板を得た。
有機ELディスプレイ(LG社製、製品名「15EL9500」)から有機ELパネルを取り出し、この有機ELパネルに貼り付けられている偏光フィルムを剥がし取り、かわりに、得られた偏光板を貼り合わせて有機ELパネルを得た。
この有機ELパネルの正面色相および正面反射率の結果を表1に示し、反射色相の視野角特性(正面方向および極角45°、方位角45°~135°方向における色相変化)を図2に示す。
偏光板の作製において、位相差フィルムの切り出しの際、長辺方向に対し、反時計回りに43°の方向が遅相軸方向となるように調整したこと以外は、実施例1と同様にして有機ELパネルを作製した。
この有機ELパネルの正面色相および正面反射率の結果を表1に示し、反射色相の視野角特性(正面方向および極角45°、方位角45°~135°方向における色相変化)を図2に示す。
偏光板の作製において、位相差フィルムの切り出しの際、長辺方向に対し、反時計回りに38°の方向が遅相軸方向となるように調整したこと以外は、実施例1と同様にして有機ELパネルを作製した。
この有機ELパネルの正面色相および正面反射率の結果を表1に示し、反射色相の視野角特性(正面方向および極角45°、方位角45°~135°方向における色相変化)を図2に示す。
偏光板の作製において、位相差フィルムの切り出しの際、長辺方向に対し、反時計回りに45°の方向が遅相軸方向となるように調整したこと以外は、実施例1と同様にして有機ELパネルを作製した。
この有機ELパネルの正面色相および正面反射率の結果を表1に示し、反射色相の視野角特性(正面方向および極角45°、方位角45°~135°方向における色相変化)を図2に示す。
偏光板の作製において、位相差フィルムの切り出しの際、長辺方向に対し、反時計回りに37°の方向が遅相軸方向となるように調整したこと以外は、実施例1と同様にして有機ELパネルを作製した。
この有機ELパネルの正面色相および正面反射率の結果を表1に示し、反射色相の視野角特性(正面方向および極角45°、方位角45°~135°方向における色相変化)を図2に示す。
位相差フィルムとして、以下のフィルムを用いたこと以外は、実施例2と同様にして有機ELパネルを作製した。
この有機ELパネルの正面色相および正面反射率の結果を表1に示し、反射色相の視野角特性(正面方向および極角45°、方位角45°~135°方向における色相変化)を図2に示す。
ゾーン延伸機を用いて、厚み130μmのノルボルネン系樹脂フィルム(JSR社製、製品名「ARTON7」、ガラス転移温度:132℃)を縦延伸した。その際、延伸倍率は130%であり、延伸温度を138℃とした。その後、テンター延伸機を用いて、横延伸を行い、厚み46~48μmの位相差フィルムを得た。その際、延伸倍率は240~260%であり、延伸温度を145~147℃とした。
得られた位相差フィルムのRe(550)は137~147nmであり、Re(450)/Re(550)は1であり、Nz係数は1.60であり、配向角は長尺方向に対し90°であった。
偏光板の作製において、位相差フィルムの切り出しの際、長辺方向に対し、反時計回りに45°の方向が遅相軸方向となるように調整したこと以外は、比較例3と同様にして有機ELパネルを作製した。
この有機ELパネルの正面色相および正面反射率の結果を表1に示し、反射色相の視野角特性(正面方向および極角45°、方位角45°~135°方向における色相変化)を図2に示す。
20 保護フィルム
21 第1の保護フィルム
22 第2の保護フィルム
30 位相差フィルム
100 偏光板
100’ 偏光板
Claims (5)
- 偏光子と位相差フィルムとを備え、
該位相差フィルムの面内位相差が、Re(450)<Re(550)の関係を満たし、
該偏光子の吸収軸と該位相差フィルムの遅相軸とのなす角度θが、38°≦θ≦44°または46°≦θ≦52°の関係を満たし、
有機ELパネルに用いられる、
偏光板:
ここで、Re(450)およびRe(550)は、それぞれ、23℃における波長450nmおよび550nmの光で測定した面内位相差を表す。 - 前記偏光子と前記位相差フィルムとの間に光学異方性層を含まない、請求項1に記載の偏光板。
- 前記位相差フィルムの面内位相差Re(550)が130nm~160nmである、請求項1または2に記載の偏光板。
- 前記位相差フィルムのNz係数が1.05~1.3である、請求項1から3のいずれかに記載の偏光板。
- 請求項1から4のいずれかに記載の偏光板を備える、有機ELパネル。
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KR1020147036579A KR20150027139A (ko) | 2012-06-29 | 2013-06-24 | 편광판 및 유기 el 패널 |
CN201380034759.5A CN104428700B (zh) | 2012-06-29 | 2013-06-24 | 偏振板及有机el面板 |
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US20150116826A1 (en) | 2015-04-30 |
TWI596386B (zh) | 2017-08-21 |
KR20150027139A (ko) | 2015-03-11 |
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JP2014010300A (ja) | 2014-01-20 |
CN104428700B (zh) | 2017-03-01 |
EP2869098A4 (en) | 2016-02-17 |
US9459389B2 (en) | 2016-10-04 |
CN104428700A (zh) | 2015-03-18 |
EP2869098A1 (en) | 2015-05-06 |
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