WO2022202019A1 - Film retardateur, plaque de polarisation circulaire utilisant ledit film retardateur, et dispositif d'affichage d'images - Google Patents

Film retardateur, plaque de polarisation circulaire utilisant ledit film retardateur, et dispositif d'affichage d'images Download PDF

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WO2022202019A1
WO2022202019A1 PCT/JP2022/006695 JP2022006695W WO2022202019A1 WO 2022202019 A1 WO2022202019 A1 WO 2022202019A1 JP 2022006695 W JP2022006695 W JP 2022006695W WO 2022202019 A1 WO2022202019 A1 WO 2022202019A1
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group
retardation film
resin
mass
substituted
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PCT/JP2022/006695
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English (en)
Japanese (ja)
Inventor
貞裕 中西
寛教 柳沼
歩夢 中原
慎悟 並木
佳史 中村
Original Assignee
日東電工株式会社
三菱ケミカル株式会社
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Priority claimed from JP2021153183A external-priority patent/JP2022151514A/ja
Application filed by 日東電工株式会社, 三菱ケミカル株式会社 filed Critical 日東電工株式会社
Priority to CN202280022949.4A priority Critical patent/CN117120890A/zh
Priority to KR1020237031298A priority patent/KR20230161958A/ko
Publication of WO2022202019A1 publication Critical patent/WO2022202019A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
    • C08G63/02—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds
    • C08G63/12—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from polycarboxylic acids and polyhydroxy compounds
    • C08G63/16—Dicarboxylic acids and dihydroxy compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
    • C08G63/64—Polyesters containing both carboxylic ester groups and carbonate groups
    • 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
    • C08K5/01—Hydrocarbons
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
    • C08L33/04—Homopolymers or copolymers of esters
    • C08L33/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical
    • C08L33/10—Homopolymers or copolymers of methacrylic acid esters
    • C08L33/12—Homopolymers or copolymers of methyl methacrylate
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L69/00—Compositions of polycarbonates; Compositions of derivatives of polycarbonates
    • C08L69/005—Polyester-carbonates
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • 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
    • 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
    • G02F1/13363—Birefringent elements, e.g. for optical compensation
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2369/00—Characterised by the use of polycarbonates; Derivatives of polycarbonates
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2433/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
    • C08J2433/04—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers esters
    • C08J2433/06—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers esters of esters containing only carbon, hydrogen, and oxygen, the oxygen atom being present only as part of the carboxyl radical
    • C08J2433/10—Homopolymers or copolymers of methacrylic acid esters
    • C08J2433/12—Homopolymers or copolymers of methyl methacrylate
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2203/00—Applications
    • C08L2203/16—Applications used for films
    • 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 retardation film, a circularly polarizing plate and an image display device using the retardation film.
  • an organic electroluminescence (EL) display device which has been put into practical use in recent years, has a highly reflective metal layer, and thus tends to cause problems such as external light reflection and background reflection. Therefore, it is known to prevent these problems by providing a circularly polarizing plate having a retardation film (typically a ⁇ /4 plate) on the viewing side as an antireflection film.
  • a retardation film typically a ⁇ /4 plate
  • reverse (sometimes referred to as a dispersion retardation film)
  • reverse dispersion retardation film a retardation film exhibiting so-called reverse dispersion wavelength dependence
  • continuous studies are being conducted for further property improvement.
  • a main object of the present invention is to provide a reverse dispersion retardation film with excellent durability in a high-temperature and high-humidity environment.
  • the retardation film of the present invention is represented by at least one bonding group selected from the group consisting of carbonate bonds and ester bonds, and a structural unit represented by the following general formula (1) and the following general formula (2).
  • Re (550) is 100 nm to 200 nm
  • Re (450) / Re (550) is greater than 0.5 and less than 1.0.
  • R 1 to R 3 are each independently a direct bond, a substituted or unsubstituted alkylene group having 1 to 4 carbon atoms
  • R 4 to R 9 are each independently In, a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms, a substituted or unsubstituted aryl group having 4 to 10 carbon atoms, a substituted or unsubstituted acyl group having 1 to 10 carbon atoms, a substituted or unsubstituted substituted or unsubstituted alkoxy group having 1 to 10 carbon atoms, substituted or unsubstituted aryloxy group having 1 to 10 carbon atoms, substituted or unsubstituted amino group, substituted or unsubstituted vinyl group having 1 to 10 carbon atoms, substituted or an unsubstituted ethynyl group having 1 to 10 carbon atoms, a substituted sulfur
  • the resin having positive refractive index anisotropy is selected from the group consisting of structural units represented by the general formula (1) and structural units represented by the general formula (2). contains 1% to 40% by mass of at least one structural unit.
  • the resin having positive refractive index anisotropy further includes a structural unit represented by the following general formula (3).
  • the resin having positive refractive index anisotropy further includes a structural unit represented by the following general formula (4).
  • the retardation film further includes an acrylic resin, and the content of the acrylic resin is 0.5% by mass or more and 2.0% by mass or less. In one embodiment, the content of the compound (A) is 1.0% by mass or more and 3.0% by mass or less. In one embodiment, the compound (A) is characterized by having a partial structure represented by the following formula (5).
  • a circularly polarizing plate is provided. This circularly polarizing plate has a polarizer and the retardation film, and the angle between the absorption axis of the polarizer and the slow axis of the retardation film is 40° to 50° or 130° to 140°. be.
  • an image display device is provided. This image display device has the above circularly polarizing plate on the viewing side, and the polarizer of the circularly polarizing plate is arranged on the viewing side.
  • a resin having a specific positive refractive index anisotropy (typically, a polycarbonate-based resin, a polyester-based resin, or a polyester carbonate-based resin) is blended with a specific compound. , it is possible to obtain a reverse dispersion retardation film excellent in durability in a high-temperature and high-humidity environment.
  • FIG. 1 is a schematic cross-sectional view of a circular polarizer according to one embodiment of the invention.
  • refractive index (nx, ny, nz) is the refractive index in the direction in which the in-plane refractive index is maximum (i.e., slow axis direction), and "ny” is the in-plane direction orthogonal to the slow axis (i.e., fast axis direction) and "nz” is the refractive index in the thickness direction.
  • In-plane retardation (Re) “Re( ⁇ )” is the in-plane retardation of the film measured at 23° C. with light of wavelength ⁇ nm.
  • Re(450) is the in-plane retardation of a film measured with light having a wavelength of 450 nm at 23°C.
  • Thickness direction retardation (Rth) is the retardation in the thickness direction of the film measured at 23° C. with light having a wavelength of ⁇ nm.
  • Rth(450) is the retardation in the thickness direction of the film measured at 23°C with light having a wavelength of 450 nm.
  • the retardation film of the present invention includes at least one bonding group selected from the group consisting of a carbonate bond and an ester bond, and a structural unit represented by the following general formula (1) and the following general formula (2) At least one structural unit selected from the group consisting of the structural units represented, and a resin having positive refractive index anisotropy; a compound (hereinafter sometimes referred to as compound (A)); is 100 nm to 200 nm, and Re(450)/Re(550) is more than 0.5 and less than 1.0.
  • compound (A) a compound having positive refractive index anisotropy
  • Re(450)/Re(550) is more than 0.5 and less than 1.0.
  • a retardation film according to an embodiment of the present invention contains a resin containing at least one bonding group selected from the group consisting of carbonate bonds and ester bonds.
  • the retardation film contains a polycarbonate-based resin, a polyester-based resin, or a polyester carbonate-based resin (hereinafter these may be collectively referred to as a polycarbonate-based resin or the like).
  • the polycarbonate-based resin or the like contains at least one structural unit selected from the group consisting of structural units represented by the general formula (1) and/or structural units represented by the general formula (2). These structural units are structural units derived from divalent oligofluorene, and are hereinafter sometimes referred to as oligofluorene structural units.
  • Such a polycarbonate-based resin or the like has a positive refractive index anisotropy.
  • a retardation film according to an embodiment of the present invention further contains a modifier.
  • the modifier is a compound (A) containing an aromatic structure and having a molecular weight of 500 or more and 2000 or less.
  • the content of compound (A) is more than 0.5% by mass and 4.0% by mass or less as described above.
  • the percentage or part in the unit of "mass” is synonymous with the percentage or part in the unit of "weight”.
  • the retardation film may further contain an acrylic resin.
  • the content of the acrylic resin is 0.5% by mass to 1.5% by mass as described above.
  • the oligofluorene structural unit is represented by general formula (1) or (2) above.
  • R 1 to R 3 are each independently a direct bond, a substituted or unsubstituted alkylene group having 1 to 4 carbon atoms
  • R 4 to R 9 are each independently In, a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms, a substituted or unsubstituted aryl group having 4 to 10 carbon atoms, a substituted or unsubstituted acyl group having 1 to 10 carbon atoms, a substituted or unsubstituted substituted or unsubstituted alkoxy group having 1 to 10 carbon atoms, substituted or unsubstituted aryloxy group having 1 to 10 carbon atoms, substituted or unsubstituted amino group, substituted or unsubstituted vinyl
  • R 1 and R 2 for example, the following alkylene groups can be employed: linear alkylene groups such as methylene group, ethylene group, n-propylene group and n-butylene group; methylmethylene group, dimethyl methylene group, ethylmethylene group, propylmethylene group, (1-methylethyl)methylene group, 1-methylethylene group, 2-methylethylene group, 1-ethylethylene group, 2-ethylethylene group, 1-methylpropylene group, Alkylene groups having a branched chain such as 2-methylpropylene group, 1,1-dimethylethylene group, 2,2-dimethylpropylene group and 3-methylpropylene group.
  • the position of the branched chain in R 1 and R 2 is indicated by the number assigned so that the carbon on the fluorene ring side is at the 1st position.
  • R1 and R2 can be related to the development of inverse dispersion wavelength dependence.
  • Polycarbonate-based resins and the like exhibit the strongest reverse dispersion wavelength dependence when the fluorene rings are oriented perpendicular to the main chain direction (stretching direction).
  • R 1 and R 2 having 2 to 3 carbon atoms on the main chain of the alkylene group. is preferred.
  • the number of carbon atoms is 1, there are cases where, unexpectedly, reverse dispersion wavelength dependence is not exhibited.
  • the orientation of the fluorene ring is fixed in a direction that is not perpendicular to the main chain direction due to steric hindrance of the carbonate group and/or ester group, which are the linking groups of the oligofluorene structural units. Conceivable.
  • the fixation of the orientation of the fluorene ring is weakened, which may result in insufficient reverse dispersion wavelength dependence. Furthermore, the heat resistance of polycarbonate-based resins and the like may be lowered.
  • alkylene groups can be employed: linear alkylene groups such as methylene group, ethylene group, n-propylene group and n-butylene group; methylmethylene group, dimethylmethylene group, ethylmethylene group, propylmethylene group, (1-methylethyl)methylene group, 1-methylethylene group, 2-methylethylene group, 1-ethylethylene group, 2-ethylethylene group, 1-methylpropylene group, 2-methyl an alkylene group having a branched chain such as a propylene group, 1,1-dimethylethylene group, 2,2-dimethylpropylene group and 3-methylpropylene group; R 3 preferably has 1 to 2 carbon atoms on the main chain of the alkylene group, more preferably 1 carbon atom.
  • the fixation of the fluorene ring is weakened as in the case of R1 and R2 , resulting in a decrease in reverse dispersion wavelength dependence, an increase in the photoelastic coefficient, a decrease in heat resistance, etc. may invite.
  • the smaller the number of carbon atoms on the main chain the better the optical properties and heat resistance.
  • Substituents for R 1 to R 3 include, for example, a halogen atom (fluorine atom, chlorine atom, bromine atom or iodine atom); an alkoxy group having 1 to 10 carbon atoms such as a methoxy group and an ethoxy group; an acetyl group and a benzoyl group.
  • a halogen atom fluorine atom, chlorine atom, bromine atom or iodine atom
  • an alkoxy group having 1 to 10 carbon atoms such as a methoxy group and an ethoxy group
  • an acetyl group and a benzoyl group an alkoxy group having 1 to 10 carbon atoms
  • acyl groups having 1 to 10 carbon atoms such as; acylamino groups having 1 to 10 carbon atoms such as an acetamide group and a benzoylamide group; a nitro group; a cyano group; An aryl group having 6 to 10 carbon atoms, such as a phenyl group and a naphthyl group, in which 1 to 3 hydrogen atoms may be substituted with the above nitro group, the above cyano group and the like.
  • substituted or unsubstituted alkyl groups for R 4 to R 9 include the following alkyl groups: methyl group, ethyl group, n-propyl group, n-butyl group, n-pentyl group, linear alkyl groups such as n-hexyl and n-decyl; branched alkyl groups such as isopropyl, 2-methylpropyl, 2,2-dimethylpropyl and 2-ethylhexyl; cyclopropyl, cyclic alkyl groups such as a cyclopentyl group, a cyclohexyl group and a cyclooctyl group;
  • the number of carbon atoms in the alkyl group is preferably 4 or less, more preferably 2 or less.
  • Substituents for the alkyl group include the substituents described above for R 1 to R 3 .
  • substituted or unsubstituted aryl groups for R 4 to R 9 include the following aryl groups: aryl groups such as phenyl, 1-naphthyl, and 2-naphthyl; 2-pyridyl. , 2-thienyl group, and 2-furyl group.
  • the number of carbon atoms in the aryl group is preferably 8 or less, more preferably 7 or less. When the number of carbon atoms is within this range, steric hindrance between fluorene rings is less likely to occur, and desired optical properties derived from the fluorene rings are likely to be obtained.
  • Substituents for the aryl group include the substituents described above for R 1 to R 3 .
  • acyl groups for example, the following acyl groups can be employed: formyl group, acetyl group, propionyl group, 2-methylpropionyl group, 2,2-dimethylpropionyl. 2-ethylhexanoyl group and other aliphatic acyl groups; benzoyl group, 1-naphthylcarbonyl group, 2-naphthylcarbonyl group, 2-furylcarbonyl group and other aromatic acyl groups.
  • the number of carbon atoms in the acyl group is preferably 4 or less, more preferably 2 or less.
  • Substituents for the acyl group include the substituents described above for R 1 to R 3 .
  • substituted or unsubstituted alkoxy group or aryloxy group for R 4 to R 9 for example, the following can be adopted: methoxy group, ethoxy group, isopropoxy group, tert-butoxy group, trifluoromethoxy group, phenoxy group.
  • the number of carbon atoms in the alkoxy group or aryloxy group is preferably 4 or less, more preferably 2 or less. When the number of carbon atoms is within this range, steric hindrance between fluorene rings is less likely to occur, and desired optical properties derived from the fluorene rings are likely to be obtained.
  • Substituents for the alkoxy group or aryloxy group include the substituents described above for R 1 to R 3 .
  • amino groups can be employed: amino group; N-methylamino group, N,N-dimethylamino group, N-ethylamino group, N,N-diethylamino group, N,N-methylethylamino group, N-propylamino group, N,N-dipropylamino group, N-isopropylamino group, N,N-diisopropylamino group and other aliphatic groups amino group; aromatic amino group such as N-phenylamino group and N,N-diphenylamino group; acylamino group such as formamide group, acetamide group, decanoylamide group, benzoylamide group and chloroacetamide group; benzyloxycarbonylamino an alkoxycarbonylamino group such as a group, a tert-butyloxycarbonylamino group;
  • Examples of substituted or unsubstituted vinyl or ethynyl groups for R 4 to R 9 include vinyl, 2-methylvinyl, 2,2-dimethylvinyl, and 2-phenylvinyl.
  • the number of carbon atoms in the vinyl group or ethynyl group is preferably 4 or less.
  • the following sulfur-containing groups can be employed: sulfo group; alkyl such as methylsulfonyl group, ethylsulfonyl group, propylsulfonyl group and isopropylsulfonyl group sulfonyl group; arylsulfonyl group such as phenylsulfonyl group and p-tolylsulfonyl group; alkylsulfinyl group such as methylsulfinyl group, ethylsulfinyl group, propylsulfinyl group and isopropylsulfinyl group; Arylsulfinyl group; Alkylthio group such as methylthio group and ethylthio group; Arylthio group such as phenylthio group and p-tolylthio group; Alkoxysulfinyl group; alkylthio group such as methylthi
  • a methylsulfinyl group, an ethylsulfinyl group, or a phenylsulfinyl group is preferred, and a methylsulfinyl group is more preferred. They do not have highly acidic protons, have low molecular weights, and can have high fluorene proportions.
  • Silicon atoms having substituents for R 4 to R 9 include, for example, the following silyl groups: trialkylsilyl groups such as trimethylsilyl group and triethylsilyl group; trimethoxysilyl group and triethoxysilyl group. trialkoxysilyl groups such as Trialkylsilyl groups are preferred. This is because it is excellent in stability and handleability.
  • the content of the oligofluorene structural unit in the polycarbonate resin or the like is preferably 1% by mass to 40% by mass, more preferably 10% by mass to 35% by mass, and still more preferably 15% by mass, based on the total resin. % to 30% by mass, particularly preferably 18% to 25% by mass. If the content of the oligofluorene structural unit is too large, problems such as an excessively large photoelastic coefficient, insufficient reliability, and insufficient retardation development may occur. Furthermore, since the proportion of the oligofluorene structural unit in the resin increases, the range of molecular design is narrowed, and it may be difficult to improve the resin when it is required to modify it.
  • Methods for adjusting the ratio of oligofluorene structural units in the resin include, for example, a method of copolymerizing a monomer having an oligofluorene structural unit and another monomer, and a method of copolymerizing a resin containing an oligofluorene structural unit with another resin.
  • a method of blending is mentioned.
  • the content of oligofluorene structural units can be precisely controlled, high transparency can be obtained, and uniform properties can be obtained over the entire surface of the film. method is preferred.
  • Polycarbonate-based resins and the like may typically contain other structural units in addition to oligofluorene structural units.
  • other structural units may preferably be derived from dihydroxy or diester compounds.
  • the monomer of is a dihydroxy compound or a diester compound that serves as a starting material for a structural unit having positive birefringence.
  • copolymerizable monomers examples include compounds into which structural units containing aromatic rings can be introduced, and compounds into which structural units containing aromatic rings are not introduced, that is, compounds composed of aliphatic structures. Specific examples of the compound composed of the aliphatic structure are given below.
  • Ethylene glycol 1,3-propanediol, 1,2-propanediol, 1,4-butanediol, 1,3-butanediol, 1,2-butanediol, 1,5-heptanediol, 1,6-hexane
  • Dihydroxy compounds of linear aliphatic hydrocarbons such as diols, 1,9-nonanediol, 1,10-decanediol and 1,12-dodecanediol
  • dihydroxy compounds of branched aliphatic hydrocarbons such as neopentyl glycol and hexylene glycol Compound; exemplified by 1,2-cyclohexanediol, 1,4-cyclohexanediol, 1,3-adamantanediol, hydrogenated bisphenol A, 2,2,4,4-tetramethyl-1,3-cyclobutanediol, etc.
  • alicyclic hydrocarbon secondary alcohols and dihydroxy compounds that are tertiary alcohols; 1,2-cyclohexanedimethanol, 1,3-cyclohexanedimethanol, 1,4-cyclohexanedimethanol, tricyclodecanedimethanol, pentacyclopentadecanedimethanol, 2,6-decalindimethanol, 1,5-decalindimethanol, 2,3-decalindimethanol, 2,3-norbornanedimethanol, 2,5-norbornanedimethanol, 1,3- Dihydroxy compounds that are primary alcohols of alicyclic hydrocarbons, exemplified by dihydroxy compounds derived from terpene compounds such as adamantane dimethanol and limonene; diethylene glycol, triethylene glycol, tetraethylene glycol, polyethylene glycol, polypropylene oxyalkylene glycols such as glycol; dihydroxy compounds having a cyclic ether structure such as isosorbide; dihydroxy compounds having
  • Aromatic bisphenol compounds 2,2-bis(4-(2-hydroxyethoxy)phenyl)propane, 2,2-bis(4-(2-hydroxypropoxy)phenyl)propane, 1,3-bis(2-hydroxy ethoxy)benzene, 4,4'-bis(2-hydroxyethoxy)biphenyl, bis(4-(2-hydroxyethoxy)phenyl) dihydroxy compounds having an ether group bonded to an aromatic group such as sulfone; terephthalic acid, phthalate acid, isophthalic acid, 4,4'-diphenyldicarboxylic acid, 4,4'-diphenyletherdicarboxylic acid aromatic dicarboxylic acids such as acids, 4,4'-benzophenonedicarboxylic acid, 4,4'-diphenoxyethanedicarboxylic acid, 4,4'-diphenylsulfonedicarboxylic acid and 2,6-naphthalenedicarboxylic acid;
  • 9,9-bis(4-(2-hydroxyethoxy)phenyl)fluorene 9,9-bis(4- Dihydroxy compounds having a fluorene ring such as hydroxyphenyl)fluorene and 9,9-bis(4-hydroxy-3-methylphenyl)fluorene
  • dicarboxylic acid compounds having a fluorene ring can also be used in combination with oligofluorene compounds.
  • the resin used in the present invention preferably contains no aromatic component as a structural unit other than the oligofluorene structural unit. That is, it is preferable to use a compound having an aliphatic structure as a copolymerizable monomer.
  • the main chain of the polymer contains an aromatic component
  • the reverse wavelength dispersion exhibited by the oligofluorene structural unit is offset, so the content of the oligofluorene structural unit must be increased, thereby increasing the light intensity.
  • the elastic modulus and mechanical properties will deteriorate.
  • the other structural unit containing no aromatic component incorporation of the aromatic component into the main chain due to the structural unit can be prevented.
  • compounds having an aliphatic structure compounds having an alicyclic structure, which are excellent in mechanical properties and heat resistance, are more preferable.
  • the content of structural units containing aromatic groups (excluding oligofluorene structural units) in the resin is preferably 5% by mass or less.
  • the resin used in the present invention preferably contains a structural unit represented by the following formula (3) as a copolymerization component among the structural units that can be introduced by the compound having an alicyclic structure.
  • Spiroglycol can be used as the dihydroxy compound into which the structural unit of formula (3) can be introduced.
  • the resin used in the present invention preferably contains the structural unit represented by the formula (3) in an amount of 5% by mass or more and 90% by mass or less.
  • the upper limit is more preferably 70% by mass or less, particularly preferably 50% by mass or less.
  • the lower limit is more preferably 10% by mass or more, more preferably 20% by mass or more, and particularly preferably 25% by mass or more.
  • the content of the structural unit represented by formula (3) is at least the lower limit, sufficient mechanical properties, heat resistance, and a low photoelastic coefficient can be obtained.
  • the compatibility with the acrylic resin is improved, and the transparency of the obtained resin composition can be further improved.
  • since spiroglycol has a relatively slow rate of polymerization reaction, it becomes easier to control the polymerization reaction by suppressing the content to the above upper limit or less.
  • the resin used in the present invention preferably further contains a structural unit represented by the following formula (4) as a copolymer component.
  • dihydroxy compounds into which the structural unit represented by formula (4) can be introduced include isosorbide (ISB), isomannide, and isoidet, which are related to stereoisomers. These may be used individually by 1 type, and may be used in combination of 2 or more type.
  • the structural unit represented by the formula (4) is contained in an amount of 5% by mass or more and 90% by mass or less.
  • the upper limit is more preferably 70% by mass or less, particularly preferably 50% by mass or less.
  • the lower limit is more preferably 10% by mass or more, particularly preferably 15% by mass or more.
  • the structural unit represented by the formula (4) has a property of high water absorption, if the content of the structural unit represented by the formula (4) is equal to or less than the above upper limit, the molded body due to water absorption Dimensional change can be suppressed within the allowable range.
  • the resin used in the present invention may further contain another structural unit.
  • Such structural units are sometimes referred to as "other structural units”.
  • 1,4-cyclohexanedimethanol, tricyclodecanedimethanol, and 1,4-cyclohexanedicarboxylic acid (and derivatives thereof) are more preferably employed.
  • Methanol and tricyclodecanedimethanol are particularly preferred.
  • Resins containing structural units derived from these monomers have an excellent balance of optical properties, heat resistance, mechanical properties, and the like.
  • diester compounds other than diester compounds containing oligofluorene structural units from the viewpoint of increasing reaction efficiency.
  • the dihydroxy compound and diester compound for introducing other structural units may be used alone or in combination of two or more according to the required performance of the resulting resin.
  • the content of other structural units in the resin is preferably 1% by mass or more and 50% by mass or less, more preferably 5% by mass or more and 40% by mass or less, and particularly preferably 10% by mass or more and 30% by mass or less.
  • Other structural units play a role in adjusting the heat resistance of the resin and imparting flexibility and toughness. , the heat resistance and optical properties may deteriorate.
  • the molecular weight of a polycarbonate-based resin can be represented, for example, by reduced viscosity.
  • the reduced viscosity is measured using methylene chloride as a solvent, precisely adjusting the concentration of the polycarbonate resin to 0.6 g/dL, and using an Ubbelohde viscosity tube at a temperature of 20.0°C ⁇ 0.1°C.
  • the lower limit of the reduced viscosity is usually preferably 0.30 dL/g or more, more preferably 0.35 dL/g or more, and particularly preferably 0.40 dL/g or more.
  • the upper limit of the reduced viscosity is generally preferably 1.00 dL/g or less, more preferably 0.80 dL/g or less, and particularly preferably 0.60 dL/g or less. If the reduced viscosity is less than the lower limit, the resulting film may have insufficient mechanical strength. On the other hand, if the reduced viscosity is higher than the upper limit, moldability, handleability and productivity may become insufficient.
  • the melt viscosity of the polycarbonate-based resin is preferably 700 Pa ⁇ s or more and 5000 Pa ⁇ s or less under measurement conditions of a temperature of 240° C. and a shear rate of 91.2 sec ⁇ 1 .
  • the upper limit is more preferably 4000 Pa ⁇ s or less, more preferably 3500 Pa ⁇ s or less, and particularly preferably 3000 Pa ⁇ s or less.
  • the lower limit is more preferably 1000 Pa ⁇ s or more, more preferably 1500 Pa ⁇ s or more, and particularly preferably 2000 Pa ⁇ s or more.
  • the melt viscosity is measured using a capillary rheometer (manufactured by Toyo Seiki Co., Ltd.).
  • the glass transition temperature (Tg) of the resin used in the present invention is preferably 110°C or higher and 160°C or lower.
  • the upper limit is more preferably 155°C or lower, more preferably 150°C or lower, and particularly preferably 145°C or lower.
  • the lower limit is more preferably 120°C or higher, particularly preferably 130°C or higher. If the glass transition temperature is outside the above range, the heat resistance tends to be poor, which may cause dimensional changes after film formation, or deteriorate the reliability of the quality under the conditions of use of the retardation film. On the other hand, if the glass transition temperature is excessively high, unevenness in film thickness may occur during film formation, the film may become brittle, the stretchability may deteriorate, and the transparency of the film may be impaired.
  • composition and manufacturing method of polycarbonate-based resins are described, for example, in International Publication No. 2015/159928 pamphlet. This description is incorporated herein by reference.
  • the retardation film in the embodiment of the present invention contains a modifier.
  • a compound (A) containing an aromatic structure and having a molecular weight of 500 or more and 2000 or less is used as the modifier.
  • the content of compound (A) is more than 0.5% by mass and not more than 4.0% by mass.
  • the lower limit of the content is more preferably 1.0% by mass or more, and particularly preferably 1.5% by mass or more.
  • the upper limit of content 3.5 mass % or less is more preferable.
  • the molecular weight of the compound (A) is 500 or more and 2000 or less as described above. Within the above range, the compound (A) is compatible with the resin, the glass transition temperature (Tg) of the resin is less lowered, and a high durability improvement effect can be obtained. In addition, during melt extrusion kneading and melt extrusion film formation, the compound (A) volatilizes or bleeds out, which can reduce the occurrence of defects such as contamination of vacuum vents and film forming rolls. . From the same viewpoint, the lower limit is more preferably 600 or more, more preferably 700 or more, and particularly preferably 800 or more. The upper limit of the molecular weight is more preferably 1800 or less, particularly preferably 1500 or less.
  • the compound (A) preferably has a partial structure represented by the following formula (5).
  • the compound containing the partial structure has better compatibility with the polycarbonate resin used in the present invention, and its bulky structure is expected to further enhance the effect of suppressing the mobility of polymer molecules. guessed.
  • Preferred compounds for the compound (A) include, for example, compounds known as antioxidants and ultraviolet absorbers having a hindered phenol structure, and pentaerythritol-tetrakis[3-(3,5- Di-tert-butyl-4-hydroxyphenyl)propionate]: trade name “Irganox 1010” (manufactured by BASF), 1,3,5-trimethyl-2,4,6-tris(3,5-di-tert-butyl -4-hydroxybenzyl)benzene: trade name "Irganox1330" (manufactured by BASF), tris(3,5-di-tert-butyl-4-hydroxybenzyl) isocyanurate: trade name "Irganox3114" (manufactured by BASF), 3-(3,5-di-tert-butyl-4-hydroxyphenyl)stearyl propionate: trade name “Irganox 1076” (manufactured by BASF),
  • the product name "Irganox 1010" (manufactured by BASF), the trade name “Irganox 1330” (manufactured by BASF), the trade name “Irganox 3114" (manufactured by BASF), the product The name "ADEKA STAB LA-31” (manufactured by ADEKA) and the trade name “ADEKA STAB LA-F70” (manufactured by ADEKA) can be preferably used.
  • pentaerythritol-tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] or 2,2′-methylenebis[6-(2H-benzotriazol-2-yl)-4-( 1,1,3,3-Tetramethylbutyl)phenol is preferred and pentaerythritol-tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] is most preferred.
  • the retardation film in the embodiment of the present invention may contain an acrylic resin.
  • an acrylic resin By containing an acrylic resin, it is possible to improve the breaking strength and critical draw ratio during film stretching, and to develop higher orientation. Moreover, the yield of the drawing process can be improved by reducing the frequency of breakage.
  • acrylic resin an acrylic resin as a thermoplastic resin is used.
  • monomers that become structural units of acrylic resins include the following compounds: methyl methacrylate, methacrylic acid, methyl acrylate, acrylic acid, benzyl (meth) acrylate, n-butyl (meth) acrylate.
  • two or more monomers may be used alone or in combination of two or more.
  • Forms in which two or more monomers are used in combination include copolymerization of two or more monomers, blends of two or more homopolymers of one monomer, and combinations thereof.
  • other monomers copolymerizable with these acrylic monomers for example, olefinic monomers and vinylic monomers may be used in combination.
  • the acrylic resin preferably contains structural units derived from methyl methacrylate.
  • the content of structural units derived from methyl methacrylate in the acrylic resin is preferably 70% by mass or more and 100% by mass or less.
  • the lower limit is more preferably 80% by mass or more, still more preferably 90% by mass or more, and particularly preferably 95% by mass or more. Within this range, excellent compatibility with the polycarbonate resin of the present invention can be obtained.
  • structural units other than methyl methacrylate it is preferable to use methyl acrylate, phenyl (meth) acrylate, benzyl (meth) acrylate, and styrene. Thermal stability can be improved by copolymerizing methyl acrylate.
  • phenyl (meth) acrylate, benzyl (meth) acrylate, and styrene it is possible to adjust the refractive index of the acrylic resin. can improve sexuality.
  • the weight average molecular weight Mw of the acrylic resin is preferably 10,000 or more and 200,000 or less.
  • the lower limit is preferably 30,000 or more, particularly preferably 50,000 or more.
  • the upper limit is preferably 180,000 or less, particularly preferably 150,000 or less. If the molecular weight is in such a range, compatibility with the polycarbonate resin of the present invention can be obtained, so that the transparency of the final retardation film can be improved, and the extensibility during stretching can be improved. A sufficient improvement effect is obtained.
  • the above weight average molecular weight is a polystyrene-equivalent molecular weight measured by GPC. Details of the measurement method will be described later. From the viewpoint of compatibility, it is preferable that the acrylic resin does not substantially contain a branched structure. The absence of a branched structure can be confirmed by the fact that the GPC curve of the acrylic resin is unimodal.
  • the content of the acrylic resin in the resin composition (resulting in the retardation film) is preferably 0% by mass or more and 2.0% by mass or less.
  • the upper limit is preferably 1.5% by mass or less, more preferably 1.0% by mass or less, even more preferably 0.9% by mass or less, and particularly preferably 0.8% by mass or less.
  • Resin Composition A polycarbonate-based resin or the like is blended with the above-mentioned modifier or acrylic resin, and the resulting resin composition is subjected to a method for producing a retardation film (the production method will be described later in Section A-3).
  • the polycarbonate resin or the like and the modifier or the acrylic resin can preferably be blended in a molten state.
  • Melt-kneading using an extruder is typically used as a method of blending in a molten state.
  • the kneading temperature is preferably 200°C to 280°C, more preferably 220°C to 270°C, still more preferably 230°C to 260°C.
  • pellets of the resin composition in which the modifier and the acrylic resin are uniformly blended can be obtained while suppressing thermal decomposition.
  • the molten resin temperature in the extruder exceeds 280°C, the resin may be colored and/or thermally decomposed.
  • the molten resin temperature in the extruder is lower than 200° C., the viscosity of the resin becomes too high, which may impose an excessive load on the extruder or result in insufficient melting of the resin.
  • Any appropriate configuration can be adopted as the configuration of the extruder, the configuration of the screw, and the like.
  • twin-screw extruder it is preferable to use a twin-screw extruder in order to obtain transparency and uniform dispersibility of the resin that can withstand use in optical films. Furthermore, residual low-molecular-weight components in the resin and low-molecular-weight thermally decomposed components during extrusion kneading may contaminate cooling rolls and transport rolls in the film forming process and stretching process. It is preferred to use an extruder with a vacuum vent.
  • the resin composition includes aromatic polycarbonates, aliphatic polycarbonates, aromatic polyesters, aliphatic polyesters, polyamides, polystyrenes, polyolefins, acrylics, amorphous polyolefins, Synthetic resins such as ABS, AS, polylactic acid, polybutylene succinate, rubbers, and combinations thereof may also be blended.
  • the resin composition may further contain additives.
  • additives include heat stabilizers, antioxidants, catalyst deactivators, ultraviolet absorbers, light stabilizers, release agents, dyes and pigments, impact modifiers, antistatic agents, lubricants, lubricants, plasticizers, agents, compatibilizers, nucleating agents, flame retardants, inorganic fillers, and blowing agents.
  • the type, number, combination, content, etc. of additives contained in the resin composition can be appropriately set according to the purpose.
  • the in-plane retardation Re (550) of the retardation film is 100 nm to 200 nm, preferably 110 nm to 180 nm, more preferably 120 nm to 160 nm, and more preferably 130 nm to 150 nm. That is, the retardation film can function as a so-called ⁇ /4 plate.
  • a retardation film typically satisfies the relationship Re(450) ⁇ Re(550) ⁇ Re(650). That is, the retardation film exhibits wavelength dependence of reverse dispersion in which the retardation value increases according to the wavelength of the measurement light.
  • Re (450) / Re (550) of the retardation film is more than 0.5 and less than 1.0 as described above, preferably 0.7 to 0.95, more preferably 0.75 to 0.92, more preferably 0.8 to 0.9.
  • Re(650)/Re(550) is preferably 1.0 or more and less than 1.15, more preferably 1.03 to 1.1.
  • the retardation film Since the retardation film has an in-plane retardation as described above, it has a relationship of nx>ny.
  • the retardation film exhibits any suitable refractive index ellipsoid as long as it has the relationship nx>ny.
  • a refractive index ellipsoid of a retardation film typically exhibits a relationship of nx>ny ⁇ nz.
  • the Nz coefficient of the retardation film is preferably 0.9 to 2.0, more preferably 0.9 to 1.5, still more preferably 0.9 to 1.2. By satisfying such a relationship, a very excellent reflection hue can be achieved when a circularly polarizing plate containing a retardation film is used in an image display device.
  • the thickness of the retardation film can be set so that it can function most appropriately as a ⁇ /4 plate.
  • the thickness can be set to obtain the desired in-plane retardation.
  • the thickness is preferably 15 ⁇ m to 60 ⁇ m, more preferably 20 ⁇ m to 55 ⁇ m, and most preferably 20 ⁇ m to 50 ⁇ m.
  • the thickness of the retardation film can be made thinner than that of a normal ⁇ /4 plate.
  • the haze value of the retardation film is preferably 1.5% or less, more preferably 1.0% or less, and even more preferably 0.5% or less. According to the embodiment of the present invention, a reverse dispersion retardation film excellent in both retardation expression and haze value can be realized. The smaller the haze value, the better. The lower limit of haze value can be, for example, 0.1%.
  • the birefringence ⁇ n of the retardation film is preferably 0.0025 or more, more preferably 0.0030 or more, still more preferably 0.0035 or more, and particularly preferably 0.0040 or more.
  • the upper limit of birefringence ⁇ n can be, for example, 0.0070.
  • the birefringence can be determined by dividing the in-plane retardation Re of the film at the highest draw ratio without breaking by the film thickness d.
  • the absolute value of the photoelastic coefficient of the retardation film is preferably 20 ⁇ 10 ⁇ 12 (m 2 /N) or less, more preferably 1.0 ⁇ 10 ⁇ 12 (m 2 /N) to 15 ⁇ 10 ⁇ 12 (m 2 /N), more preferably 2.0 ⁇ 10 ⁇ 12 (m 2 /N) to 12 ⁇ 10 ⁇ 12 (m 2 /N). If the absolute value of the photoelastic coefficient is within such a range, display unevenness can be suppressed when the retardation film is applied to an image display device.
  • A-3 Method for producing a retardation film
  • the retardation film described in items A-1 and A-2 is obtained by forming a film from the resin composition described in item A-1 and further stretching the film.
  • Any appropriate molding method can be employed as a method for forming a film from the resin composition. Specific examples include compression molding method, transfer molding method, injection molding method, extrusion molding method, blow molding method, powder molding method, FRP molding method, cast coating method (e.g., casting method), calendar molding method, and heat press. law, etc.
  • an extrusion molding method or a cast coating method is preferable because it can improve the smoothness of the obtained film and obtain good optical uniformity.
  • the extrusion method especially the melt extrusion method using a T-die, is particularly preferable from the viewpoint of film productivity and ease of subsequent stretching processing.
  • Molding conditions can be appropriately set according to the composition and type of the resin used, properties desired for the retardation film, and the like. In this way, a resin film containing a polycarbonate-based resin or the like can be obtained.
  • the thickness of the resin film can be set to any appropriate value depending on the desired thickness of the obtained retardation film, desired optical properties, stretching conditions described later, and the like. It is preferably 50 ⁇ m to 300 ⁇ m.
  • any suitable drawing method and drawing conditions eg, drawing temperature, draw ratio, drawing direction
  • various drawing methods such as free-end drawing, fixed-end drawing, free-end contraction, and fixed-end contraction can be used singly or simultaneously or sequentially.
  • the stretching direction the stretching can be performed in various directions and dimensions such as the length direction, the width direction, the thickness direction, the oblique direction, and the like.
  • a retardation film having the desired optical properties for example, refractive index properties, in-plane retardation, Nz coefficient
  • the retardation film is produced by uniaxially stretching or fixed-end uniaxially stretching a resin film.
  • uniaxial stretching there is a method of stretching in the running direction (longitudinal direction) while running the resin film in the longitudinal direction.
  • a specific example of the fixed-end uniaxial stretching is a method of stretching in the width direction (horizontal direction) while running the resin film in the longitudinal direction.
  • the draw ratio is preferably 1.1 times to 3.5 times.
  • the retardation film can be produced by continuously obliquely stretching a long resin film in a direction at a predetermined angle with respect to the longitudinal direction.
  • a long stretched film having a predetermined orientation angle (slow axis in the direction of the predetermined angle) with respect to the longitudinal direction of the film can be obtained.
  • Roll-to-roll can be performed during lamination, and the manufacturing process can be simplified.
  • the predetermined angle may be the angle formed by the absorption axis of the polarizer and the slow axis of the retardation film in the circularly polarizing plate (described later).
  • the angle is preferably 40° to 50°, more preferably 42° to 48°, even more preferably 44° to 46°, particularly preferably about 45°, as described below; or , preferably 130° to 140°, more preferably 132° to 138°, still more preferably 134° to 136°, particularly preferably about 135°.
  • a stretching machine used for diagonal stretching includes, for example, a tenter-type stretching machine capable of applying a feeding force, a pulling force, or a taking-up force at different speeds in the horizontal and/or vertical direction.
  • 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 it can continuously obliquely stretch a long resin film.
  • a retardation film having the desired in-plane retardation and a slow axis in the desired direction (substantially, a long retardation film) can be obtained.
  • JP-A-50-83482, JP-A-2-113920, JP-A-3-182701, JP-A-2000-9912, JP-A-2002-86554, A method described in JP-A-2002-22944 and the like can be mentioned.
  • the stretching temperature of the film is a temperature below the glass transition temperature (Tg) of the polycarbonate resin or the like.
  • Tg glass transition temperature
  • the film is in a glass state at temperatures below Tg, so stretching is substantially impossible.
  • an acrylic resin typically, polymethyl methacrylate
  • stretching at Tg or less can be performed without substantially changing the Tg of a polycarbonate resin or the like. It becomes possible.
  • an inverse dispersion retardation film that is excellent in stretchability and retardation expression and has a small haze.
  • the stretching temperature is preferably Tg to Tg-10°C, more preferably Tg to Tg-8°C, still more preferably Tg to Tg-5°C.
  • the film can be stretched appropriately even at a temperature higher than Tg, for example, up to about Tg+5°C or up to, for example, about Tg+2°C.
  • FIG. 1 is a schematic cross-sectional view of a circular polarizer according to one embodiment of the invention.
  • the illustrated circularly polarizing plate 100 has a polarizing plate 10 and a retardation film 20 .
  • the retardation film 20 is the retardation film according to the embodiment of the present invention described in Section A above.
  • the polarizing plate 10 includes a polarizer 11, a first protective layer 12 arranged on one side of the polarizer 11, and a second protective layer 13 arranged on the other side of the polarizer 11. .
  • the retardation film 20 may also function as a protective layer for the polarizer 11, so the second protective layer 13 may be omitted.
  • the angle between the slow axis of the retardation film 20 and the absorption axis of the polarizer 11 is preferably 40° to 50°, more preferably 42° to 48°, still more preferably 44° to 46°. is particularly preferably about 45°; alternatively preferably 130° to 140°, more preferably 132° to 138°, even more preferably 134° to 136°, particularly preferably about 135°.
  • another retardation layer and/or a conductive layer or an isotropic substrate with a conductive layer may be provided (not shown).
  • Another retardation layer and a conductive layer or an isotropic substrate with a conductive layer are typically provided outside the retardation film 20 (on the side opposite to the polarizing plate 10).
  • Another retardation layer and a conductive layer or an isotropic substrate with a conductive layer are typically provided in this order from the retardation film 20 side.
  • the circularly polarizing plate is a so-called inner touch panel type input in which a touch sensor is incorporated between the image display cell (e.g., organic EL cell) and the polarizing plate. It can be applied to display devices.
  • the circularly polarizing plate may have an additional retardation layer.
  • the additional retardation layer may be provided in combination with another retardation layer, or may be provided alone (that is, without providing another retardation layer).
  • the optical properties for example, refractive index properties, in-plane retardation, Nz coefficient, photoelastic coefficient), thickness, arrangement position, etc. of the additional retardation layer can be appropriately set according to the purpose.
  • the circularly polarizing plate may be sheet-shaped or elongated.
  • the term "long shape” means an elongated shape whose length is sufficiently long relative to its width, for example, an elongated shape whose length is 10 times or more, preferably 20 times or more, its width.
  • a long circularly polarizing plate can be wound into a roll.
  • the polarizing plate and the retardation film are also elongated.
  • the polarizer preferably has an absorption axis in the longitudinal direction.
  • the retardation film is preferably an obliquely stretched film having a slow axis in a direction forming an angle of 40° to 50° or 130° to 140° with respect to the longitudinal direction. If the polarizer and the retardation film have such configurations, the circularly polarizing plate can be produced by roll-to-roll.
  • an adhesive layer (not shown) is provided on the opposite side of the retardation film to the polarizing plate, and the circularly polarizing plate can be attached to the image display cell. Furthermore, it is preferable that a release film is temporarily attached to the surface of the pressure-sensitive adhesive layer until the circularly polarizing plate is used. Temporarily attaching the release film protects the pressure-sensitive adhesive layer and enables roll formation of the circularly polarizing plate.
  • the resin film forming the polarizer may be a single-layer resin film or a laminate of two or more layers.
  • the polarizer composed of a single-layer resin film include hydrophilic polymer films such as polyvinyl alcohol (PVA) films, partially formalized PVA films, and partially saponified ethylene/vinyl acetate copolymer films.
  • hydrophilic polymer films such as polyvinyl alcohol (PVA) films, partially formalized PVA films, and partially saponified ethylene/vinyl acetate copolymer films.
  • oriented polyene films such as those dyed with dichroic substances such as iodine and dichroic dyes and stretched, and dehydrated PVA and dehydrochlorinated polyvinyl chloride films.
  • a polarizer obtained by dyeing a PVA-based film with iodine and uniaxially stretching the film is preferably used because of its excellent optical properties.
  • the dyeing with iodine is performed, for example, by immersing the PVA-based film in an aqueous iodine solution.
  • the draw ratio of the uniaxial drawing is preferably 3 to 7 times. Stretching may be performed after the dyeing treatment, or may be performed while dyeing. Moreover, you may dye after extending
  • the PVA-based film is subjected to swelling treatment, cross-linking treatment, washing treatment, drying treatment, and the like. For example, by immersing the PVA-based film in water and washing it with water before dyeing, not only can dirt and anti-blocking agents on the surface of the PVA-based film be washed away, but also the PVA-based film can be swollen to remove uneven dyeing. can be prevented.
  • the polarizer obtained using a laminate include a laminate of a resin substrate and a PVA-based resin layer (PVA-based resin film) laminated on the resin substrate, or a resin substrate and the resin
  • a polarizer obtained by using a laminate with a PVA-based resin layer formed by coating on a substrate can be mentioned.
  • a polarizer obtained by using a laminate of a resin base material and a PVA-based resin layer formed by coating on the resin base material is obtained, for example, by applying a PVA-based resin solution to the resin base material and drying the resin base material.
  • stretching typically includes immersing the laminate in an aqueous boric acid solution and stretching. Furthermore, stretching may further include stretching the laminate in air at a high temperature (eg, 95° C. or higher) before stretching in an aqueous boric acid solution, if necessary.
  • the obtained resin substrate/polarizer laminate may be used as it is (that is, the resin substrate may be used as a protective layer for the polarizer), or the resin substrate may be peeled off from the resin substrate/polarizer laminate.
  • any appropriate protective layer may be laminated on the release surface according to the purpose. Details of such a polarizer manufacturing method are described in, for example, Japanese Patent Application Laid-Open No. 2012-73580 (Patent No. 5414738) and Japanese Patent No. 6470455. The descriptions of these patent documents are incorporated herein by reference.
  • the thickness of the polarizer is preferably 15 ⁇ m or less, more preferably 1 ⁇ m to 12 ⁇ m, still more preferably 3 ⁇ m to 10 ⁇ m, particularly preferably 3 ⁇ m to 8 ⁇ m. If the thickness of the polarizer is within such a range, it is possible to satisfactorily suppress curling during heating, and obtain excellent durability in appearance during heating. Furthermore, if the thickness of the polarizer is within such a range, it can contribute to thinning of the circularly polarizing plate (and, as a result, the organic EL display device).
  • the polarizer preferably exhibits absorption dichroism at any wavelength of 380 nm to 780 nm.
  • the single transmittance of the polarizer is preferably 43.0% to 46.0%, more preferably 44.5% to 46.0%.
  • the degree of polarization of the polarizer is preferably 97.0% or higher, more preferably 99.0% or higher, still more preferably 99.9% or higher.
  • First protective layer 12 and second protective layer 13 are each formed of any suitable film that can be used as a protective layer for a polarizer.
  • the material that is the main component of the film include cellulose-based resins such as triacetyl cellulose (TAC), polyester-based, polyvinyl alcohol-based, polycarbonate-based, polyamide-based, polyimide-based, polyethersulfone-based, and polysulfone-based resins. , polystyrene-based, polynorbornene-based, polyolefin-based, (meth)acrylic-based, and acetate-based transparent resins.
  • TAC triacetyl cellulose
  • polyester-based polyvinyl alcohol-based
  • polycarbonate-based polyamide-based
  • polyimide-based polyimide-based
  • polyethersulfone-based polysulfone-based resins.
  • polystyrene-based polynorbornene-based
  • polyolefin-based poly
  • Thermosetting resins such as (meth)acrylic, urethane, (meth)acrylic urethane, epoxy, and silicone, or ultraviolet curable resins may also be used.
  • a glassy polymer such as a siloxane-based polymer can also be used.
  • polymer films described in JP-A-2001-343529 can also be used. Materials for this film include, for example, a resin composition containing a thermoplastic resin having a substituted or unsubstituted imide group in a side chain and a thermoplastic resin having a substituted or unsubstituted phenyl group and nitrile group in a side chain.
  • the polymer film can be, for example, an extrudate of the resin composition.
  • the circularly polarizing plate is typically arranged on the viewing side of the image display device, and the first protective layer 12 is typically arranged on the viewing side. Therefore, the first protective layer 12 may be subjected to surface treatment such as hard coat treatment, anti-reflection treatment, anti-sticking treatment, and anti-glare treatment, if necessary. Further/or, the first protective layer 12 may optionally be treated to improve visibility when viewed through polarized sunglasses (typically, imparting (elliptical) polarizing function, imparting an ultra-high retardation) may be applied. By performing such processing, excellent visibility can be achieved even when the display screen is viewed through polarized lenses such as polarized sunglasses. Therefore, the circularly polarizing plate can be suitably applied to an image display device that can be used outdoors.
  • polarized sunglasses typically, imparting (elliptical) polarizing function, imparting an ultra-high retardation
  • the thickness of the first protective layer is typically 300 ⁇ m or less, preferably 100 ⁇ m or less, more preferably 5 ⁇ m to 80 ⁇ m, still more preferably 10 ⁇ m to 60 ⁇ m.
  • the thickness of the outer protective layer is the thickness including the thickness of the surface treatment layer.
  • the second protective layer 13 is preferably optically isotropic in one embodiment.
  • “optically isotropic” means that the in-plane retardation Re (550) is 0 nm to 10 nm and the thickness direction retardation Rth (550) is ⁇ 10 nm to +10 nm.
  • image Display Device The circularly polarizing plate described in the above section B can be applied to an image display device. Accordingly, embodiments of the present invention also include image display devices using such circularly polarizing plates. Typical examples of image display devices include liquid crystal display devices and organic EL display devices.
  • An image display device according to an embodiment of the present invention includes the circularly polarizing plate described in the above item B on the viewing side thereof. The circularly polarizing plate is arranged so that the polarizer is on the viewing side.
  • the content of the modifier is obtained by the following formula.
  • the coefficient ⁇ was determined from the measurement results of samples with known contents.
  • Modifier content [% by mass] ⁇ x Y / (X + Y) x 100
  • the equipment and conditions used are as follows.
  • Isosorbide manufactured by Rocket Fleuret
  • SPG Spiroglycol [manufactured by Mitsubishi Gas Chemical Company, Inc.]
  • DPC diphenyl carbonate [manufactured by Mitsubishi Chemical Corporation]
  • PHL Phenol [manufactured by Mitsubishi Chemical Corporation]
  • Irganox 1010 pentaerythritol-tetrakis [3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] [manufactured by BASF] ...
  • molecular weight 1178 ⁇ Irganox 1330 1,3,5-trimethyl-2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene [manufactured by BASF] ... molecular weight 775 ⁇ Irganox 3114: tris (3,5-di-tert-butyl-4-hydroxybenzyl) isocyanurate [manufactured by BASF] ... molecular weight 784 ⁇ LA-31: 2,2′-methylenebis[6-(2H-benzotriazol-2-yl)-4-(1,1,3,3,-tetramethylbutyl)phenol [manufactured by ADEKA] ...
  • molecular weight 659 ⁇ LA-F70 6,6′,6′′-(1,3,5-triazine-2,4,6-triyl)tris(3-hexyloxy-2-methylphenol) [manufactured by ADEKA] ...
  • molecular weight 700 ⁇ TPP triphenyl phosphate [manufactured by Tokyo Chemical Industry Co., Ltd.] ...
  • molecular weight 326 ⁇ DMT dimethyl terephthalate [manufactured by Tokyo Chemical Industry Co., Ltd.] ...
  • a polyester carbonate resin was polymerized using a continuous polymerization facility consisting of three vertical stirring reactors, one horizontal stirring reactor, and a twin-screw extruder.
  • ISB, SPG and PHL, and BPFM and DPC were melted in each dissolving tank (PHL is used as a solvent for dissolving SPG).
  • PHL is used as a solvent for dissolving SPG.
  • the weight ratio of SPG and PHL was 55.0/45.0
  • the weight ratio of BPFM and DPC was 30.3/69.7.
  • the internal temperature, internal pressure, and residence time of each reactor are as follows: 1st vertical stirring reactor: 195°C, 27 kPa, 90 minutes, 2nd vertical stirring reactor: 205°C, 20 kPa, 70 minutes, 3rd vertical Type stirring reactor: 220° C., 10 kPa, 60 minutes, fourth horizontal stirring reactor: 235° C., 0.1 to 1.0 kPa, 150 minutes. The operation was performed while finely adjusting the vacuum pressure of the fourth horizontal stirring reactor so that the reduced viscosity of the finally obtained resin was 0.45 to 0.47 dL/g.
  • the resin extracted from the fourth horizontal stirring reactor was supplied in a molten state to a vented twin-screw extruder [manufactured by Japan Steel Works, Ltd.].
  • the extruder has two vacuum vent ports, where residual low molecular weight components in the resin are devolatilized and removed, and phosphonic acid as a catalyst deactivator is added to the polyester carbonate resin before the first vent. was added at 3.7 ppm by weight. After the second vent, Irganox 1010 and PEP36 as heat stabilizers were added to the polyester carbonate resin at 1000 mass ppm and 100 mass ppm, respectively.
  • Irganox 1010 and PEP36 added here are compounds corresponding to the compound (A) in the present invention, and shall be included in the content of the modifier.
  • the polycarbonate resin still in a molten state, was passed through an Ultipleated Candle Filter [manufactured by PALL Co.] having an opening of 10 ⁇ m to filter out foreign matter.
  • the molten resin was extruded through a die in the form of a strand, cooled with water, solidified, and then pelletized by cutting with a rotary cutter.
  • Example 1 Using the polyester carbonate resin obtained in Production Example 1, extrusion kneading was carried out. Pellets of polyester carbonate resin and 2.0% by mass of Irganox 1010 as a modifier were mixed and fed into a twin-screw extruder TEX30HSS [manufactured by Japan Steel Works, Ltd.] using a constant feeder. The extruder cylinder temperature was set to 240° C., and extrusion was performed at a throughput of 12 kg/hr and a screw rotation speed of 120 rpm. Further, the extruder was equipped with a vacuum vent, and the molten resin was extruded while devolatilizing under reduced pressure.
  • the molten resin was extruded through a die in the form of a strand, cooled with water, solidified, and then cut with a rotary cutter to form pellets.
  • the pellets of the resin composition thus obtained were vacuum-dried at 100° C. for 6 hours or longer, and then a single-screw extruder (manufactured by Technobel, screw diameter 30 mm, cylinder set temperature: 235° C., with vacuum vent ), a T-die (width 400 mm, set temperature: 245 ° C.), a chill roll (set temperature: 125 to 135 ° C.), and a film forming apparatus equipped with a winder. A long unstretched film was produced.
  • the obtained film had a glass transition temperature (Tg) of 137° C. and a water absorption of 1.6%.
  • Tg glass transition temperature
  • TD direction perpendicular to the transport direction
  • This sample is fixed-end uniaxially stretched in the TD direction by changing the stretching ratio, using a laboratory stretcher "Bluckner KARO IV", setting the stretching temperature to "Tg + 4 ° C.” of the resin sample, and in-plane retardation Re ( A retardation film was produced by adjusting the measurement wavelength (590 nm) to 145 nm. Table 1 shows the results.
  • Example 2 A retardation film was produced in the same manner as in Example 1, except that 1% by mass of Irganox 1330 was blended as a modifier. A small amount of deposit was confirmed on the chill roll surface. The film had a Tg of 140° C. and a water absorption of 1.7%. The obtained retardation film was subjected to the same evaluation as in Example 1. Table 1 shows the results.
  • Example 3 A retardation film was produced in the same manner as in Example 1, except that 2% by mass of Irganox 1330 was blended as a modifier. A small amount of deposit was confirmed on the chill roll surface. The film had a Tg of 139° C. and a water absorption of 1.6%. The obtained retardation film was subjected to the same evaluation as in Example 1. Table 1 shows the results.
  • Example 4 A retardation film was produced in the same manner as in Example 1, except that 2% by mass of Irganox 3114 was blended as a modifier. A small amount of deposit was confirmed on the chill roll surface. The film had a Tg of 139° C. and a water absorption of 1.7%. The obtained retardation film was subjected to the same evaluation as in Example 1. Table 1 shows the results.
  • Example 5 A retardation film was produced in the same manner as in Example 1, except that 2% by mass of LA-31 was blended as a modifier. No dirt on the chill roll surface was observed. The film had a Tg of 138° C. and a water absorption of 1.7%. The obtained retardation film was subjected to the same evaluation as in Example 1. Table 1 shows the results.
  • Example 6 A retardation film was produced in the same manner as in Example 1, except that 2% by mass of Irganox 1010 as a modifier and 0.7% by mass of BR80 as an acrylic resin were blended. No dirt on the chill roll surface was observed. The Tg of the film was 137°C and the water absorption was 1.6%. Furthermore, a retardation film was obtained in the same manner as in Example 1, except that the stretching temperature was set to "Tg-2°C" of the resin sample. Table 1 shows the results.
  • Example 7 A retardation film was produced in the same manner as in Example 1 except that 1.5% by mass of Irganox 1010 as a modifier, 0.3% by mass of LA-F70, and 0.7% by mass of BR80 as an acrylic resin were blended. . No dirt on the chill roll surface was observed. The Tg of the film was 137°C and the water absorption was 1.7%. The obtained retardation film was subjected to the same evaluation as in Example 1. Table 1 shows the results.
  • Example 1 A retardation film was produced in the same manner as in Example 1, except that 0.2% by mass of Irganox 1010 was blended as a modifier. No dirt on the chill roll surface was observed. The film had a Tg of 140° C. and a water absorption of 1.8%. The obtained retardation film was subjected to the same evaluation as in Example 1. Table 1 shows the results.
  • Example 2 Extrusion kneading was carried out in the same manner as in Example 1 except that 5% by mass of Irganox 1010 was blended as a modifier, but the state of molten resin discharge was not stable, and a pellet-like sample could not be obtained.
  • Example 3 A retardation film was produced in the same manner as in Example 1, except that 2% by mass of TPP was blended as a modifier. No dirt on the chill roll surface was observed. The film had a Tg of 134° C. and a water absorption of 1.5%. The obtained retardation film was subjected to the same evaluation as in Example 1. Table 1 shows the results.
  • Example 4 A retardation film was produced in the same manner as in Example 1, except that 2% by mass of DMT was blended as a modifier. A small amount of deposit was confirmed on the chill roll surface. The film had a Tg of 131° C. and a water absorption of 1.5%. The obtained retardation film was subjected to the same evaluation as in Example 1. Table 1 shows the results.
  • the retardation film of the present invention can be suitably used for a circularly polarizing plate, and the circularly polarizing plate can be suitably used for an image display device (typically, a liquid crystal display device, an organic EL display device).
  • an image display device typically, a liquid crystal display device, an organic EL display device.

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  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
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  • Polyesters Or Polycarbonates (AREA)
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Abstract

L'invention concerne un film retardateur à dispersion inverse présentant une excellente durabilité dans des environnements caractérisés par une température élevée et une humidité élevée. Le film retardateur d'après la présente invention comprend : une résine qui comprend au moins un groupe de liaison choisi dans le groupe constitué par une liaison carbonate et une liaison ester, et au moins un motif structural choisi dans le groupe constitué par des motifs structuraux représentés par la formule générale (1) et des motifs structuraux représentés par la formule générale (2), et qui a une anisotropie d'indice de réfraction positive ; et un composé (A) qui comprend une structure aromatique et qui a un poids moléculaire de 500 à 2000. La quantité contenue du composé (A) est supérieure à 0,5 % en masse mais inférieure ou égale à 4,0 % en masse. Re(550) est de 100 à 200 nm et Re(450)/Re(550) est supérieur à 0,5 mais inférieur à 1,0.
PCT/JP2022/006695 2021-03-26 2022-02-18 Film retardateur, plaque de polarisation circulaire utilisant ledit film retardateur, et dispositif d'affichage d'images WO2022202019A1 (fr)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015178607A (ja) * 2014-02-27 2015-10-08 三菱化学株式会社 トリフルオレンジエステル、オリゴフルオレンジエステル組成物、樹脂組成物、延伸フィルム、円偏光板及び画像表示装置
JP2017075255A (ja) * 2015-10-15 2017-04-20 三菱化学株式会社 熱可塑性樹脂、及びそれよりなる光学成形体
JP2020076968A (ja) * 2018-10-15 2020-05-21 日東電工株式会社 位相差層付偏光板およびそれを用いた画像表示装置
JP2021001328A (ja) * 2019-06-24 2021-01-07 三菱ケミカル株式会社 熱可塑性樹脂、それよりなる光学フィルム、ジオール化合物、ジエステル化合物

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EP1457792A1 (fr) 1998-10-30 2004-09-15 Teijin Limited Film à différence de phase et dispositif optique dans lequel il est utilisé

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015178607A (ja) * 2014-02-27 2015-10-08 三菱化学株式会社 トリフルオレンジエステル、オリゴフルオレンジエステル組成物、樹脂組成物、延伸フィルム、円偏光板及び画像表示装置
JP2017075255A (ja) * 2015-10-15 2017-04-20 三菱化学株式会社 熱可塑性樹脂、及びそれよりなる光学成形体
JP2020076968A (ja) * 2018-10-15 2020-05-21 日東電工株式会社 位相差層付偏光板およびそれを用いた画像表示装置
JP2021001328A (ja) * 2019-06-24 2021-01-07 三菱ケミカル株式会社 熱可塑性樹脂、それよりなる光学フィルム、ジオール化合物、ジエステル化合物

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