WO2018124137A1 - Film optique et plque polarisante - Google Patents

Film optique et plque polarisante Download PDF

Info

Publication number
WO2018124137A1
WO2018124137A1 PCT/JP2017/046794 JP2017046794W WO2018124137A1 WO 2018124137 A1 WO2018124137 A1 WO 2018124137A1 JP 2017046794 W JP2017046794 W JP 2017046794W WO 2018124137 A1 WO2018124137 A1 WO 2018124137A1
Authority
WO
WIPO (PCT)
Prior art keywords
resin
optical film
film
polymer
less
Prior art date
Application number
PCT/JP2017/046794
Other languages
English (en)
Japanese (ja)
Inventor
恭輔 井上
Original Assignee
日本ゼオン株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 日本ゼオン株式会社 filed Critical 日本ゼオン株式会社
Priority to JP2018559548A priority Critical patent/JPWO2018124137A1/ja
Priority to CN201780066644.2A priority patent/CN109923448B/zh
Priority to KR1020197016612A priority patent/KR102638927B1/ko
Publication of WO2018124137A1 publication Critical patent/WO2018124137A1/fr

Links

Images

Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • 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

Definitions

  • the present invention relates to an optical film and a polarizing plate.
  • a polarizing plate includes a polarizer and a polarizer protective film.
  • the polarizer protective film an optical film made of a resin is usually used (see Patent Document 1).
  • the polarizing plate provided in the liquid crystal display device usually includes a polarizer protective film on both sides of the polarizer.
  • the inner polarizer protective film provided on the liquid crystal cell side of the polarizer is required to have a small absolute value of retardation from the viewpoint of realizing good viewing angle characteristics.
  • the applicant has studied an optical film made of a resin that hardly exhibits retardation for use as an inner polarizer protective film.
  • an optical film formed of a resin that hardly develops retardation easily breaks during film transportation, and particularly easily breaks during trimming.
  • an optical film is manufactured as a wide and long film, it is subjected to various treatments while being continuously conveyed in the longitudinal direction.
  • the trimming process for processing the optical film into a desired size is performed as the above process, the film easily breaks in the part subjected to the trimming process. Therefore, in order to use an optical film made of a resin that hardly develops retardation as an inner polarizer protective film, it is possible to improve the transportability and to transport while suppressing the occurrence of breakage. It was sought after.
  • the inner polarizer protective film is less likely to be deformed in a harsh environment.
  • the inner polarizer protective film is a polarizing plate provided with the inner polarizing protective film in a high temperature and high humidity environment. It is required that deformation is difficult to occur to the extent that curling can be suppressed.
  • some of the conventional resins were difficult to develop retardation or could form a film having excellent transportability, but in a high temperature and high humidity environment. None that can curl was found.
  • the present invention was devised in view of the above problems, an optical film having a small retardation, excellent transportability, and capable of suppressing the occurrence of curling in a high-temperature and high-humidity environment; and a polarization comprising the optical film
  • the purpose is to provide a board.
  • the present inventor can solve the above problems by an optical film in which the absolute value of retardation in the thickness direction, impact strength, and water vapor transmission rate are within a predetermined range. And the present invention was completed. That is, the present invention includes the following.
  • the absolute value of retardation in the thickness direction is 3 nm or less, The impact strength is 2 ⁇ 10 ⁇ 2 J or more, and An optical film having a water vapor transmission rate of 10 g / (m 2 ⁇ 24 h) or less.
  • the optical film is formed of a core layer formed of resin C, a first skin layer formed of resin S1 on one side of the core layer, and resin S2 on the other side of the core layer.
  • the absolute value of retardation in the thickness direction at a thickness of 40 ⁇ m of the resin C is 3 nm or less,
  • the impact strength of the resin S1 at a thickness of 40 ⁇ m is 5 ⁇ 10 ⁇ 2 J or more
  • the optical film according to [1] wherein the impact strength of the resin S2 at a thickness of 40 ⁇ m is 5 ⁇ 10 ⁇ 2 J or more.
  • the resin C contains a hydride of a block copolymer,
  • the total ratio of the thickness Ts1 of the first skin layer and the thickness Ts2 of the second skin layer to the thickness Tc of the core layer ((Ts1 + Ts2) / Tc) is 0.05 to 0.4. [2] or [3].
  • a polarizing plate comprising the optical film according to any one of [1] to [5] and a polarizer.
  • an optical film having small retardation, excellent transportability, and capable of suppressing the occurrence of curling in a high temperature and high humidity environment; and a polarizing plate comprising the optical film.
  • FIG. 1 is a cross-sectional view schematically showing an optical film according to an embodiment of the present invention.
  • FIG. 2 is a perspective view schematically showing an apparatus for measuring the impact strength of an optical film used in Examples and Comparative Examples.
  • FIG. 3 is a cross-sectional view schematically showing an apparatus for measuring the impact strength of an optical film used in Examples and Comparative Examples.
  • FIG. 4 is a cross-sectional view schematically showing a cross section of the trimming blade used in Examples and Comparative Examples cut along a plane perpendicular to the film conveyance direction.
  • nx represents a refractive index in a direction (in-plane direction) perpendicular to the thickness direction of the film or layer and giving the maximum refractive index.
  • ny represents the refractive index in the in-plane direction of the film or layer and perpendicular to the nx direction.
  • nz represents the refractive index in the thickness direction of the film or layer.
  • d represents the thickness of the film or layer.
  • the retardation measurement wavelength is 590 nm unless otherwise specified.
  • the “polarizing plate” includes not only a rigid member but also a flexible member such as a resin film.
  • the “long” film means a film having a length of 5 times or more, preferably 10 times or more, and specifically a roll.
  • the upper limit of the length of the long film is not particularly limited, and can be, for example, 100,000 times or less with respect to the width.
  • the inclination direction of a surface means a direction that is neither parallel nor perpendicular to the surface, specifically, a range in which the polar angle of the surface is greater than 0 ° and less than 90 °. Pointing in the direction.
  • the cyclic hydrocarbon group means a hydrocarbon group containing a cyclic structure such as an aromatic ring, cycloalkane, cycloalkene, etc., and a chain hydrocarbon compound Means a hydrocarbon compound that does not contain such a cyclic hydrocarbon group.
  • the optical film of the present invention has (ii) an absolute value of retardation in the thickness direction, (iii) impact strength, and (iv) water vapor transmission rate in a predetermined range.
  • the absolute value of retardation in the thickness direction of the optical film is usually 3 nm or less, preferably 2 nm or less, more preferably 1.5 nm or less, and further preferably 1.0 nm or less.
  • the optical film having a small absolute value of retardation in the thickness direction as described above can improve the viewing angle characteristics of a liquid crystal display device including the polarizing plate when used as an inner polarizer protective film of the polarizing plate. .
  • an optical film is used as an inner polarizer protective film provided on the viewing side of a liquid crystal cell of an IPS (in-plane switching) type liquid crystal display device, a remarkable effect can be obtained.
  • IPS in-plane switching
  • the optical film of the present invention preferably further has (i) an absolute value of in-plane retardation in a predetermined range.
  • the absolute value of the in-plane retardation of the optical film is preferably 6 nm or less, more preferably 3 nm or less, still more preferably 2 nm or less, particularly preferably 1.5 nm or less, particularly preferably 1.0 nm or less. is there.
  • An optical film in which both the absolute value of retardation in the thickness direction and the absolute value of in-plane retardation are small in this way has an effect of improving viewing angle characteristics obtained when used as an inner polarizer protective film of a polarizing plate. It can be exhibited more remarkably.
  • the in-plane retardation and the thickness direction retardation of the film can be measured at a measurement wavelength of 590 nm using “AxoScan” manufactured by AXOMETRICS as a measuring device.
  • the average refractive index of the film is used.
  • the average refractive index means the average value of the refractive index in two directions perpendicular to each other in the in-plane direction of the film and the refractive index in the thickness direction of the film.
  • the average refractive index of the multilayer film is the thickness ratio of the average refractive index of each layer included in the multilayer film.
  • a weighted average based on may be employed.
  • the impact strength of the optical film is usually 2 ⁇ 10 ⁇ 2 J or higher, preferably 4.0 ⁇ 10 ⁇ 2 J or higher, more preferably 6.0 ⁇ 10 ⁇ 2 J or higher.
  • An optical film having such a high impact strength is unlikely to break due to an impact during film conveyance, and is difficult to break during a trimming process, for example. Therefore, since the optical film having such a high impact strength is excellent in transportability, it can be transported smoothly while suppressing the occurrence of breakage.
  • the impact strength of the optical film is preferably as large as possible, but is preferably 30 ⁇ 10 ⁇ 2 J or less, more preferably 25 ⁇ 10 ⁇ 2 J or less, and more preferably from the viewpoint of thinning the optical film and easy production. Is 20 ⁇ 10 ⁇ 2 J or less.
  • Impact strength can be measured by performing an impact test using a predetermined striker on a film fixed with a jig. In consideration of the small thickness of the film, it is preferable to measure the impact strength as described in the column of the evaluation items in the examples without using a commercially available impact tester.
  • the water vapor transmission rate of the optical film is usually 10 g / (m 2 ⁇ 24 h) or less, preferably 8 g / (m 2 ⁇ 24 h) or less, more preferably 6 g / (m 2 ⁇ 24 h) or less.
  • the optical film having a low water vapor transmission rate is less likely to be deformed in a high temperature and high humidity environment.
  • this optical film is used as a polarizer protective film, water can be prevented from entering the polarizer, so that generation of stress in the polarizer due to moisture can be suppressed.
  • the water vapor transmission rate of the optical film is preferably as low as possible, and ideally 0 g / (m 2 ⁇ 24 h).
  • the water vapor transmission rate of the optical film can be measured using a water vapor transmission rate measuring device ("PERMATRAN-W" manufactured by MOCON) under the conditions of a temperature of 40 ° C and a humidity of 90% RH according to JIS K 7129 B method.
  • PERMATRAN-W water vapor transmission rate measuring device
  • the optical film is usually formed as a resin film.
  • the layer structure of this optical film is arbitrary as long as (ii) the absolute value of retardation in the thickness direction, (iii) impact strength, and (iv) water vapor transmission rate are within the predetermined ranges described above.
  • the optical film can be realized, for example, by combining a layer formed of a resin having low retardation and a layer formed of a resin having excellent impact strength.
  • FIG. 1 is a cross-sectional view schematically showing an optical film according to an embodiment of the present invention.
  • an optical film 100 according to an embodiment of the present invention includes a core layer 110 formed of resin C, and a first skin layer 120 formed of resin S1 on one side of the core layer 110.
  • the second skin layer 130 formed of the resin S2 is provided on the other side of the core layer 100.
  • the resin C a resin having a small absolute value of retardation is used.
  • the resin S1 and the resin S2 a resin having excellent impact strength is used.
  • the core layer 110 formed of the resin C having a small absolute value of retardation is provided between the first skin layer 120 and the second skin layer 130 formed of the resins S1 and S2 having excellent impact strength.
  • the optical film 100 may include an arbitrary layer, but it is preferable that the core layer 110 and the first skin layer 120 are in direct contact with each other without any layer interposed therebetween. It is preferable that the layer 110 and the second skin layer 130 are in direct contact with each other without any layer interposed therebetween.
  • the core layer is a layer formed of a resin C having a small retardation absolute value.
  • the absolute value of retardation in the thickness direction at a thickness of 40 ⁇ m of the resin C is usually 3 nm or less, preferably 2 nm or less, more preferably 1.5 nm or less, and particularly preferably 1.0 nm or less.
  • the absolute value of the in-plane retardation of the resin C at a thickness of 40 ⁇ m is preferably 2 nm or less, more preferably 1.5 nm or less, particularly preferably. 1.0 nm or less.
  • the in-plane retardation and the retardation in the thickness direction of the resin C at a thickness of 40 ⁇ m refer to the in-plane retardation and the retardation in the thickness direction of a film of 40 ⁇ m thickness formed from the resin C, respectively.
  • the in-plane retardation and the thickness direction retardation of the resin C at a thickness of 40 ⁇ m are obtained by manufacturing a sample film having a thickness of 40 ⁇ m using the resin C and measuring the in-plane retardation and the thickness direction retardation of the sample film. Is required.
  • the resin C a resin containing a polymer and further containing an optional component as necessary can be used.
  • resin containing the hydride of a block copolymer is preferable.
  • the hydride of this block copolymer includes a block A having a cyclic hydrocarbon group-containing compound hydride unit (a) and a block B having a chain hydrocarbon compound hydride unit (b).
  • Polymers are particularly preferred.
  • such a polymer may be referred to as “polymer X” as appropriate.
  • Cyclic hydrocarbon group-containing compound hydride unit (a) polymerizes a cyclic hydrocarbon group-containing compound, and if the unit obtained by such polymerization has an unsaturated bond, the unsaturated bond is It is a structural unit having a structure obtained by hydrogenation.
  • the cyclic hydrocarbon group-containing compound hydride unit (a) includes units obtained by any production method as long as it has the structure.
  • the cyclic hydrocarbon group-containing compound hydride unit (a) is preferably an aromatic vinyl compound hydride unit (a) having a structure obtained by polymerizing an aromatic vinyl compound and hydrogenating an unsaturated bond thereof. is there.
  • the aromatic vinyl compound hydride unit (a) includes units obtained by any production method as long as it has the structure.
  • a structural unit having a structure obtained by polymerizing styrene and hydrogenating the unsaturated bond may be referred to as a styrene hydride unit.
  • the styrene hydride unit also includes a unit obtained by any production method as long as it has the structure.
  • Examples of the aromatic vinyl compound hydride unit (a) include a structural unit represented by the following structural formula (1).
  • R c represents an alicyclic hydrocarbon group.
  • R c include cyclohexyl groups such as cyclohexyl group; decahydronaphthyl groups and the like.
  • R 1 , R 2 and R 3 are each independently a hydrogen atom, a chain hydrocarbon group, a halogen atom, an alkoxy group, a hydroxyl group, an ester group, a cyano group, an amide group or an imide group.
  • the polar group include a halogen atom, an alkoxy group, a hydroxyl group, an ester group, a cyano group, an amide group, an imide group, and a silyl group.
  • R 1 , R 2 and R 3 are preferably a hydrogen atom and a chain hydrocarbon group having 1 to 6 carbon atoms from the viewpoints of heat resistance, low birefringence and mechanical strength.
  • the chain hydrocarbon group is preferably a saturated hydrocarbon group, and more preferably an alkyl group.
  • aromatic vinyl compound hydride unit (a) include a structural unit represented by the following formula (1-1).
  • the structural unit represented by the formula (1-1) is a styrene hydride unit.
  • cyclic hydrocarbon group-containing compound hydride unit (a) those having stereoisomers can be used. Only one type of cyclic hydrocarbon group-containing compound hydride unit (a) may be used, or two or more types may be used in combination at any ratio.
  • the block A is preferably composed of only the cyclic hydrocarbon group-containing compound hydride unit (a), but may contain any unit other than the cyclic hydrocarbon group-containing compound hydride unit (a).
  • Examples of arbitrary structural units include structural units based on vinyl compounds other than cyclic hydrocarbon group-containing compound hydride units (a).
  • the content of any structural unit in the block A is preferably 10% by weight or less, more preferably 5% by weight or less, and particularly preferably 1% by weight or less.
  • the chain hydrocarbon compound hydride unit (b) is obtained by polymerizing a chain hydrocarbon compound and further hydrogenating the unsaturated bond if the unit obtained by the polymerization has an unsaturated bond. Is a structural unit having the structure However, the chain hydrocarbon compound hydride unit (b) includes units obtained by any production method as long as it has the structure.
  • the chain hydrocarbon compound hydride unit (b) preferably has a structure obtained by polymerizing a diene compound and hydrogenating the unsaturated bond if the resulting polymer has an unsaturated bond. It is a diene compound hydride unit (b).
  • the diene compound hydride unit (b) includes units obtained by any production method as long as it has the structure.
  • a structural unit having a structure obtained by polymerizing isoprene and hydrogenating the unsaturated bond may be referred to as an isoprene hydride unit.
  • the isoprene hydride unit also includes a unit obtained by any production method as long as it has the structure.
  • the diene compound hydride unit (b) preferably has a structure obtained by polymerizing a conjugated diene compound such as a linear conjugated diene compound and hydrogenating the unsaturated bond. Examples thereof include a structural unit represented by the following structural formula (2) and a structural unit represented by the structural formula (3).
  • R 4 to R 9 are each independently a hydrogen atom, a chain hydrocarbon group, a halogen atom, an alkoxy group, a hydroxyl group, an ester group, a cyano group, an amide group, an imide group, or a silyl group.
  • the polar group include a halogen atom, an alkoxy group, a hydroxyl group, an ester group, a cyano group, an amide group, an imide group, and a silyl group.
  • R 4 to R 9 are preferably a hydrogen atom and a chain hydrocarbon group having 1 to 6 carbon atoms from the viewpoints of heat resistance, low birefringence, mechanical strength, and the like.
  • the chain hydrocarbon group is preferably a saturated hydrocarbon group, and more preferably an alkyl group.
  • R 10 to R 15 each independently represent a hydrogen atom, a chain hydrocarbon group, a halogen atom, an alkoxy group, a hydroxyl group, an ester group, a cyano group, an amide group, an imide group, or a silyl group.
  • R 10 to R 15 represents a chain hydrocarbon group substituted with a polar group.
  • the polar group include a halogen atom, an alkoxy group, a hydroxyl group, an ester group, a cyano group, an amide group, an imide group, and a silyl group.
  • R 10 to R 15 are preferably a hydrogen atom and a chain hydrocarbon group having 1 to 6 carbon atoms from the viewpoints of heat resistance, low birefringence, mechanical strength, and the like.
  • the chain hydrocarbon group is preferably a saturated hydrocarbon group, and more preferably an alkyl group.
  • diene compound hydride unit (b) include structural units represented by the following formulas (2-1) to (2-3).
  • the structural units represented by the formulas (2-1) to (2-3) are isoprene hydride units.
  • chain hydrocarbon compound hydride unit (b) having a stereoisomer can be used. Only one type of chain hydrocarbon compound hydride unit (b) may be used, or two or more types may be used in combination at any ratio.
  • the block B is preferably composed of only the chain hydrocarbon compound hydride unit (b), but may contain any unit other than the chain hydrocarbon compound hydride unit (b).
  • Examples of arbitrary structural units include structural units based on vinyl compounds other than the chain hydrocarbon compound hydride unit (b).
  • the content of any structural unit in the block B is preferably 10% by weight or less, more preferably 5% by weight or less, and particularly preferably 1% by weight or less.
  • the polymer X preferably has a triblock molecular structure having one block B per molecule and two blocks A per molecule linked to both ends thereof. That is, the polymer X has one block B per molecule; and one block A1 per molecule having a cyclic hydrocarbon group-containing compound hydride unit (a) connected to one end of the block B; A triblock copolymer containing one block A2 per molecule and having a cyclic hydrocarbon group-containing compound hydride unit (a) connected to the other end of B is preferable. At this time, the block A1 and the block A2 may be the same or different.
  • the weight ratio (A / B) between the block A and the block B is preferably within a specific range.
  • the weight ratio (A / B) is preferably 50/50 or more, more preferably 65/35 or more, particularly preferably 80/20 or more, preferably 99/1 or less, more preferably 95. / 5 or less, particularly preferably 90/10 or less.
  • the polymer X in which the weight ratio (A / B) between the block A and the block B is in the above range has a small photoelastic coefficient and a low retardation. Therefore, a core layer having a small retardation absolute value can be easily obtained.
  • the above-mentioned polymer X usually has a low water vapor absorbency. Therefore, by using the polymer X, it becomes difficult for water vapor to permeate the core layer C, so that an optical film having a low water vapor transmission rate can be easily obtained.
  • the production method of the polymer X is not particularly limited, and any production method can be adopted.
  • the polymer X was obtained, for example, by preparing monomers corresponding to the cyclic hydrocarbon group-containing compound hydride unit (a) and the chain hydrocarbon compound hydride unit (b), and polymerizing them. It can be produced by hydrogenating the polymer.
  • an aromatic vinyl compound can be used as the monomer corresponding to the cyclic hydrocarbon group-containing compound hydride unit (a).
  • examples include styrene, ⁇ -methyl styrene, ⁇ -ethyl styrene, ⁇ -propyl styrene, ⁇ -isopropyl styrene, ⁇ -t-butyl styrene, 2-methyl styrene, 3-methyl styrene, 4-methyl styrene, 2 , 4-diisopropylstyrene, 2,4-dimethylstyrene, 4-t-butylstyrene, 5-t-butyl-2-methylstyrene, monochlorostyrene, dichlorostyrene, monofluorostyrene, and 4-phenylstyrene Vinylcyclohexanes such as vinylcyclohexane and 3-methylisopropenylcyclohe
  • Examples of monomers corresponding to the chain hydrocarbon compound hydride unit (b) include butadiene, isoprene, 2,3-dimethyl-1,3-butadiene, 1,3-pentadiene, and 1,3-hexadiene. And chain conjugated dienes such as These monomers may be used individually by 1 type, and may be used combining two or more types by arbitrary ratios.
  • anionic polymerization can be usually employed.
  • the polymerization may be performed by any of bulk polymerization and solution polymerization. Among these, solution polymerization is preferable in order to continuously perform the polymerization reaction and the hydrogenation reaction.
  • reaction solvents for polymerization include aliphatic hydrocarbon solvents such as n-butane, n-pentane, isopentane, n-hexane, n-heptane, and isooctane; cyclopentane, cyclohexane, methylcyclopentane, methylcyclohexane, and And alicyclic hydrocarbon solvents such as decalin; and aromatic hydrocarbon solvents such as benzene and toluene.
  • an aliphatic hydrocarbon solvent and an alicyclic hydrocarbon solvent are preferable because they can be used as they are as an inert solvent for the hydrogenation reaction.
  • a reaction solvent may be used individually by 1 type, and may be used combining two or more types by arbitrary ratios. The reaction solvent is usually used at a ratio of 200 to 10,000 parts by weight with respect to 100 parts by weight of the total monomers.
  • a polymerization initiator is usually used.
  • polymerization initiators include monoorganolithiums such as n-butyllithium, sec-butyllithium, t-butyllithium, hexyllithium, and phenyllithium; and dilithiomethane, 1,4-diobane, and 1,4-dilithiol Examples thereof include polyfunctional organolithium compounds such as 2-ethylcyclohexane.
  • a polymerization initiator may be used individually by 1 type, and may be used combining two or more types by arbitrary ratios.
  • Examples of the production method in the case of producing a triblock copolymer containing block A1, block A2 and block B as the polymer X include production methods including the following first to third steps.
  • the material called “monomer composition” includes not only a mixture of two or more substances but also a material composed of a single substance.
  • First step A step of polymerizing the monomer composition (a1) containing an aromatic vinyl compound to form the block A.
  • Second step A step of polymerizing the monomer composition (b) containing a diene compound at one end of the block A to form a block B to form a diblock polymer AB.
  • Third step A step of obtaining a triblock copolymer by polymerizing the monomer composition (a2) containing an aromatic vinyl compound at the terminal on the block B side of the diblock polymer.
  • the monomer composition (a1) and the monomer composition (a2) may be the same or different.
  • a polymerization accelerator and a randomizer can be used in order to prevent an excessively long chain of one component in each block.
  • a Lewis base compound can be used as a randomizer.
  • Lewis base compounds include ether compounds such as dimethyl ether, diethyl ether, diisopropyl ether, dibutyl ether, tetrahydrofuran, diphenyl ether, ethylene glycol diethyl ether, and ethylene glycol methyl phenyl ether; tetramethylethylenediamine, trimethylamine, triethylamine, and pyridine.
  • Tertiary amine compounds such as potassium-t-amyl oxide and alkali metal alkoxide compounds such as potassium-t-butyl oxide; and phosphine compounds such as triphenylphosphine.
  • phosphine compounds such as triphenylphosphine.
  • One of these may be used alone, or two or more of these may be used in combination at any ratio.
  • the polymerization temperature is not limited as long as the polymerization proceeds, but is usually 0 ° C. or higher, preferably 20 ° C. or higher, and is usually 200 ° C. or lower, preferably 100 ° C. or lower, more preferably 80 ° C. or lower.
  • the polymer After polymerization, the polymer can be recovered from the reaction mixture by any method if necessary. Examples of the recovery method include a steam stripping method, a direct desolvation method, and an alcohol coagulation method. Further, when a solvent inert to the hydrogenation reaction is used as the reaction solvent during the polymerization, the polymer can be used as it is without recovering the polymer from the polymerization solution.
  • Hydrogenation can be performed, for example, using a suitable hydrogenation catalyst. More specifically, hydrogenation is performed using a hydrogenation catalyst containing at least one metal selected from the group consisting of nickel, cobalt, iron, rhodium, palladium, platinum, ruthenium, and rhenium in an organic solvent. sell.
  • the hydrogenation catalyst may be a heterogeneous catalyst or a homogeneous catalyst.
  • a hydrogenation catalyst may be used individually by 1 type, and may be used combining two or more types by arbitrary ratios.
  • the heterogeneous catalyst may be used as it is as a metal or a metal compound, or may be used by being supported on an appropriate carrier.
  • the carrier include activated carbon, silica, alumina, calcium carbide, titania, magnesia, zirconia, diatomaceous earth, and silicon carbide.
  • the amount of the catalyst supported on the carrier is usually 0.01% by weight or more, preferably 0.05% by weight or more, and usually 80% by weight or less, preferably 60% by weight or less.
  • homogeneous catalysts include catalysts combining nickel, cobalt, or iron compounds with organometallic compounds (eg, organoaluminum compounds, organolithium compounds); and rhodium, palladium, platinum, ruthenium, rhenium, etc.
  • organometallic complex catalyst is mentioned.
  • nickel, cobalt, or iron compounds include acetylacetone salts, naphthenates, cyclopentadienyl compounds, and cyclopentadienyl dichloro compounds of these metals.
  • organoaluminum compounds include alkylaluminums such as triethylaluminum and triisobutylaluminum; aluminum halides such as diethylaluminum chloride and ethylaluminum dichloride; and alkylaluminum hydrides such as diisobutylaluminum hydride.
  • organometallic complex catalyst include metal complexes such as ⁇ -dichloro- ⁇ -benzene complex, dichloro-tris (triphenylphosphine) complex, hydrido-chloro-triphenylphosphine complex of the above metals.
  • the amount of the hydrogenation catalyst used is usually 0.01 parts by weight or more, preferably 0.05 parts by weight or more, more preferably 0.1 parts by weight or more, and usually 100 parts by weight with respect to 100 parts by weight of the polymer. Hereinafter, it is preferably 50 parts by weight or less, more preferably 30 parts by weight or less.
  • the reaction temperature during the hydrogenation reaction is usually 10 ° C. to 250 ° C., but is preferably 50 ° C. or more, more preferably, because the hydrogenation rate can be increased and the polymer chain scission reaction can be reduced. It is 80 degreeC or more, Preferably it is 200 degrees C or less, More preferably, it is 180 degrees C or less.
  • the pressure during the reaction is usually 0.1 MPa to 30 MPa, but in addition to the above reasons, from the viewpoint of operability, it is preferably 1 MPa or more, more preferably 2 MPa or more, preferably 20 MPa or less, more preferably 10 MPa or less.
  • the hydrogenation rate is usually 90% or more, preferably 95% or more, more preferably 97% or more. By increasing the hydrogenation rate, the low birefringence and thermal stability of the polymer X can be increased.
  • the hydrogenation rate can be measured by 1 H-NMR.
  • the weight average molecular weight Mw of the polymer contained in the resin C is preferably 50000 or more, more preferably 55000 or more, particularly preferably 60000 or more, preferably 80000 or less, more preferably 75000 or less, and particularly preferably 70000 or less. is there.
  • the weight average molecular weight Mw is in the above range, an optical film having the above characteristics can be easily obtained.
  • the retardation can be effectively reduced.
  • the molecular weight distribution (weight average molecular weight (Mw) / number average molecular weight (Mn)) of the polymer contained in the resin C is preferably 2.0 or less, more preferably 1.7 or less, and particularly preferably 1.5 or less. Yes, preferably 1.0 or more.
  • Mw weight average molecular weight
  • Mn number average molecular weight
  • the weight average molecular weight Mw and the number average molecular weight Mn of the polymer can be measured as values in terms of polystyrene by gel permeation chromatography using tetrahydrofuran as a solvent.
  • Resin C may contain one type of polymer alone or two or more types in combination at any ratio.
  • the ratio of the polymer in the resin C is preferably 90% by weight or more, more preferably 95% by weight or more, and particularly preferably 97% by weight or more from the viewpoint of easily obtaining a desired optical film.
  • Resin C may contain an optional component in combination with the polymer described above.
  • Optional components include, for example, inorganic fine particles; stabilizers such as antioxidants, heat stabilizers, ultraviolet absorbers, near infrared absorbers; resin modifiers such as lubricants and plasticizers; colorants such as dyes and pigments And antistatic agents.
  • these arbitrary components one type may be used alone, or two or more types may be used in combination at an arbitrary ratio. However, from the viewpoint of remarkably exhibiting the effects of the present invention, it is preferable that the content of any component is small.
  • the total ratio of arbitrary components is preferably 10 parts by weight or less, more preferably 5 parts by weight or less, and still more preferably 3 parts by weight or less with respect to 100 parts by weight of the polymer contained in the resin C.
  • the water vapor transmission rate at a thickness of 40 ⁇ m of the resin C is preferably 100 g / (m 2 ⁇ 24 h) or less, preferably 50 g / (m 2 ⁇ 24 h) or less, more preferably 10 g / (m 2 ⁇ 24 h) or less. .
  • the water vapor transmission rate of the resin C at a thickness of 40 ⁇ m refers to the water vapor transmission rate of a film formed of the resin C and having a thickness of 40 ⁇ m.
  • the water vapor transmission rate at a thickness of 40 ⁇ m of the resin C is obtained by producing a sample film having a thickness of 40 ⁇ m using the resin C and measuring the water vapor transmission rate of the sample film.
  • the absolute value of the retardation of the core layer is usually small.
  • the absolute value of the in-plane retardation of the core layer is preferably 2.0 nm or less, more preferably 1.0 nm or less, and particularly preferably 0.5 nm or less.
  • the absolute value of retardation in the thickness direction of the core layer is preferably 2.0 nm or less, more preferably 1.0 nm or less, and particularly preferably 0.5 nm or less.
  • the in-plane retardation and the thickness direction retardation of the layers contained in the film are R0 and R40 of the film, R0 and R40 of the sample film excluding some layers from the film, and the average refractive index of the layer.
  • R0 represents retardation measured in the normal direction of the main surface of the film
  • R40 represents retardation measured in a direction forming an angle of 40 ° with respect to the normal line of the main surface of the film.
  • These R0 and R40 can be measured at a measurement wavelength of 590 nm using “AxoScan” manufactured by AXOMETRICS as a measuring device.
  • the average refractive index of the layer contained in the film can be obtained by producing a sample film using the resin contained in the layer and measuring the refractive index of the sample film.
  • the thickness of the core layer is preferably 20 ⁇ m or more, more preferably 25 ⁇ m or more, particularly preferably 30 ⁇ m or more, preferably 80 ⁇ m or less, more preferably 60 ⁇ m or less, and particularly preferably 40 ⁇ m or less.
  • the retardation value can be lowered, and when the thickness is not more than the upper limit value of the range, the optical film can be thinned.
  • the ratio of the total thickness Ts1 of the first skin layer and the thickness Ts2 of the second skin layer to the thickness Tc of the core layer ((Ts1 + Ts2) / Tc) is preferably within a predetermined range (see FIG. 1). .
  • the thickness ratio ((Ts1 + Ts2) / Tc) is preferably 0.05 or more, more preferably 0.15 or more, particularly preferably 0.25 or more, and preferably 0.4 or less. , More preferably 0.38 or less, particularly preferably 0.35 or less.
  • the thickness ratio ((Ts1 + Ts2) / Tc) is equal to or higher than the lower limit of the range, the impact resistance of the optical film can be effectively increased, and is equal to or lower than the upper limit of the range.
  • the absolute value of retardation of the optical film can be effectively reduced.
  • the first skin layer is a layer formed on one side of the core layer with a resin S1 having excellent impact strength.
  • the impact strength of the resin S1 at a thickness of 40 ⁇ m is preferably 5 ⁇ 10 ⁇ 2 J or more, more preferably 7 ⁇ 10 ⁇ 2 J or more, and particularly preferably 9 ⁇ 10 ⁇ 2 J or more.
  • the upper limit of the impact strength at a thickness of 40 ⁇ m of the resin S1 is preferably 30 ⁇ 10 ⁇ 2 J or less, more preferably 25 ⁇ 10 ⁇ 2 J or less, and particularly preferably 20 ⁇ from the viewpoint of easy production of an optical film. 10 ⁇ 2 J or less.
  • the impact strength of the resin S1 at a thickness of 40 ⁇ m refers to the impact strength of a 40 ⁇ m-thick film formed of the resin S1.
  • the impact strength of the resin S1 at a thickness of 40 ⁇ m is obtained by manufacturing a sample film having a thickness of 40 ⁇ m using the resin S1 and measuring the impact strength of the sample film.
  • a resin containing a polymer and further containing an optional component as necessary can be used.
  • resin containing the polymer containing an alicyclic structure is preferable.
  • a polymer containing an alicyclic structure may be referred to as an “alicyclic structure-containing polymer” as appropriate. Since the alicyclic structure-containing polymer is excellent in mechanical strength, the impact strength of the optical film can be effectively increased. In addition, since the alicyclic structure-containing polymer has low hygroscopicity, the water vapor transmission rate of the optical film can be effectively reduced. Furthermore, the alicyclic structure-containing polymer is usually excellent in transparency, dimensional stability and lightness.
  • the alicyclic structure-containing polymer is a polymer having an alicyclic structure in a repeating unit, and examples thereof include a polymer obtainable by a polymerization reaction using a cyclic olefin as a monomer or a hydride thereof. It is done.
  • a polymer which contains alicyclic structure in a principal chain and the polymer which contains alicyclic structure in a side chain can be used.
  • the alicyclic structure include a cycloalkane structure and a cycloalkene structure, and a cycloalkane structure is preferable from the viewpoint of thermal stability.
  • the number of carbon atoms contained in one alicyclic structure is preferably 4 or more, more preferably 5 or more, more preferably 6 or more, preferably 30 or less, more preferably 20 or less, Particularly preferred is 15 or less.
  • the number of carbon atoms contained in one alicyclic structure is within the above range, mechanical strength, heat resistance, and moldability are highly balanced.
  • the ratio of the repeating unit having an alicyclic structure in the alicyclic structure-containing polymer is preferably 30% by weight or more, more preferably 50% by weight or more, still more preferably 70% by weight or more, and particularly preferably 90% by weight. That's it. Heat resistance can be improved by increasing the ratio of the repeating unit having an alicyclic structure as described above.
  • the remainder other than the structural unit having an alicyclic structure is not particularly limited and may be appropriately selected according to the purpose of use.
  • the alicyclic structure-containing polymer either a polymer having crystallinity or a polymer having no crystallinity may be used, or both may be used in combination.
  • the polymer having crystallinity refers to a polymer having a melting point Mp.
  • the polymer having the melting point Mp refers to a polymer whose melting point Mp can be observed with a differential scanning calorimeter (DSC).
  • DSC differential scanning calorimeter
  • the impact strength of the optical film can be particularly increased by using the alicyclic structure-containing polymer having crystallinity.
  • the manufacturing cost of an optical film can be lowered
  • Examples of the alicyclic structure-containing polymer having crystallinity include the following polymer ( ⁇ ) to polymer ( ⁇ ). Among these, the polymer ( ⁇ ) is preferable as the alicyclic structure-containing polymer having crystallinity because an optical film excellent in heat resistance is easily obtained.
  • Polymer ( ⁇ ) A hydride of polymer ( ⁇ ) having crystallinity.
  • Polymer ( ⁇ ) An addition polymer of a cyclic olefin monomer having crystallinity.
  • Polymer ( ⁇ ) a hydride of polymer ( ⁇ ), etc., having crystallinity.
  • the alicyclic structure-containing polymer having crystallinity is a ring-opening polymer of dicyclopentadiene having crystallinity, or a hydride of a ring-opening polymer of dicyclopentadiene.
  • those having crystallinity are more preferable, and those which are hydrides of ring-opening polymers of dicyclopentadiene and have crystallinity are particularly preferable.
  • the ring-opening polymer of dicyclopentadiene means that the proportion of structural units derived from dicyclopentadiene relative to all structural units is usually 50% by weight or more, preferably 70% by weight or more, more preferably 90% by weight or more, More preferably, it refers to a polymer of 100% by weight.
  • the alicyclic structure-containing polymer having crystallinity may not be crystallized before the optical film is produced. However, after the optical film is produced, the alicyclic structure-containing polymer having crystallinity contained in the optical film can usually have a high degree of crystallinity by being crystallized.
  • the specific crystallinity range can be appropriately selected according to the desired performance, but is preferably 10% or more, more preferably 15% or more.
  • the melting point Mp of the alicyclic structure-containing polymer having crystallinity is preferably 200 ° C. or higher, more preferably 230 ° C. or higher, and preferably 290 ° C. or lower.
  • the alicyclic structure-containing polymer having crystallinity as described above can be produced, for example, by the method described in International Publication No. 2016/066873.
  • the alicyclic structure-containing polymer having no crystallinity includes, for example, (1) a norbornene polymer, (2) a monocyclic olefin polymer, (3) a cyclic conjugated diene polymer, and (4) vinyl.
  • examples thereof include alicyclic hydrocarbon polymers and hydrides thereof.
  • a norbornene polymer and a hydride thereof are more preferable from the viewpoints of transparency and moldability.
  • Examples of the norbornene polymer include a ring-opening polymer of a norbornene monomer, a ring-opening copolymer of a norbornene monomer and another monomer capable of ring-opening copolymerization, and a hydride thereof; an addition polymer of a norbornene monomer, norbornene Examples thereof include addition copolymers with other monomers copolymerizable with the monomers.
  • a ring-opening polymer hydride of a norbornene monomer is particularly preferable from the viewpoint of transparency.
  • the above alicyclic structure-containing polymer is selected from, for example, polymers disclosed in JP-A No. 2002-321302.
  • a resin containing an alicyclic structure-containing polymer having no crystallinity various products are commercially available. Among them, those having desired characteristics can be appropriately selected and used. Examples of such commercial products are “ZEONOR” (manufactured by ZEON CORPORATION), “ARTON” (manufactured by JSR Corporation), “Apel” (manufactured by Mitsui Chemicals), “TOPAS” (manufactured by Polyplastics Co., Ltd.). ) Product group.
  • the glass transition temperature Tg of the polymer contained in the resin S1 is preferably 80 ° C. or higher, more preferably 85 ° C. or higher, still more preferably 100 ° C. or higher, preferably 250 ° C. or lower, more preferably 170 ° C. or lower. .
  • a polymer having a glass transition temperature in such a range is not easily deformed or stressed when used at high temperatures, and has excellent durability.
  • the weight average molecular weight (Mw) of the polymer contained in the resin S1 is preferably 1,000 or more, more preferably 2,000 or more, still more preferably 10,000 or more, particularly preferably 25,000 or more, preferably Is not more than 1,000,000, more preferably not more than 500,000, still more preferably not more than 100,000, particularly preferably not more than 80,000, particularly preferably not more than 50,000.
  • a polymer having such a weight average molecular weight has an excellent balance between moldability and heat resistance.
  • the molecular weight distribution (Mw / Mn) of the polymer contained in the resin S1 is preferably 1.0 or more, more preferably 1.2 or more, particularly preferably 1.5 or more, preferably 10 or less, more preferably 4.0 or less, more preferably 3.5 or less.
  • Mn represents a number average molecular weight.
  • a polymer having such a molecular weight distribution is excellent in moldability.
  • Resin S1 may contain one type of polymer alone or two or more types in combination at any ratio.
  • the ratio of the polymer in the resin S1 is preferably 50% by weight or more, more preferably 70% by weight or more, further preferably 80% by weight or more, and particularly preferably 90% by weight from the viewpoint of easily obtaining a desired optical film. That's it.
  • Resin S1 may contain an arbitrary component in combination with the polymer described above.
  • the optional component include the same examples as those given as optional components that can be contained in the resin C.
  • arbitrary components may be used individually by 1 type, and may be used combining two or more types by arbitrary ratios. However, from the viewpoint of remarkably exhibiting the effects of the present invention, it is preferable that the content of any component is small.
  • the total ratio of the arbitrary components is preferably 50 parts by weight or less, more preferably 30 parts by weight or less, still more preferably 20 parts by weight or less, with respect to 100 parts by weight of the polymer contained in the resin S1. Part or less is particularly preferable.
  • the water vapor transmission rate of the resin S1 at a thickness of 40 ⁇ m is preferably 100 g / (m 2 ⁇ 24 h) or less, preferably 50 g / (m 2 ⁇ 24 h) or less, more preferably 10 g / (m 2 ⁇ 24 h) or less. .
  • the water vapor transmission rate at a thickness of 40 ⁇ m of the resin S1 refers to the water vapor transmission rate of a film having a thickness of 40 ⁇ m formed of the resin S1.
  • the water vapor transmission rate of the resin S1 at a thickness of 40 ⁇ m is obtained by producing a sample film having a thickness of 40 ⁇ m using the resin S1 and measuring the water vapor transmission rate of the sample film.
  • the absolute value of retardation of the first skin layer is preferably small.
  • the absolute value of the in-plane retardation of the first skin layer is preferably 2.0 nm or less, more preferably 1.5 nm or less, and particularly preferably 1.0 nm or less.
  • the absolute value of retardation in the thickness direction of the first skin layer is preferably 2.0 nm or less, more preferably 1.5 nm or less, and particularly preferably 1.0 nm or less.
  • the thickness of the first skin layer is preferably 1.0 ⁇ m or more, more preferably 2.0 ⁇ m or more, particularly preferably 3.0 ⁇ m or more, preferably 9 ⁇ m or less, more preferably 7 ⁇ m or less, particularly preferably 5 ⁇ m or less. is there.
  • the thickness of the first skin layer is not less than the lower limit of the above range, the impact strength of the optical film can be effectively increased, and when it is not more than the upper limit of the above range, the retardation of the optical film can be increased.
  • the absolute value can be effectively reduced.
  • the second skin layer is a layer formed of the resin S2 having excellent impact strength on the other side of the core layer.
  • the impact strength of the resin S2 at a thickness of 40 ⁇ m is in the same range as the impact strength range of the resin S1 at a thickness of 40 ⁇ m.
  • the impact strength of the resin S2 at a thickness of 40 ⁇ m may be the same as or different from the impact strength of the resin S1 at a thickness of 40 ⁇ m.
  • the second skin layer formed of the resin S2 having excellent impact strength in combination with the first skin layer formed of the resin S1 also having excellent impact strength, the impact strength of the optical film itself can be increased. .
  • the impact strength of the resin S2 at a thickness of 40 ⁇ m refers to the impact strength of a film of 40 ⁇ m thickness formed from the resin S2.
  • the impact strength of the resin S2 at a thickness of 40 ⁇ m can be measured by the same method as the impact strength of the resin S1 at a thickness of 40 ⁇ m.
  • a resin having the range described as the resin S1 can be arbitrarily used. Thereby, the same effect as the effect by a 1st skin layer can be acquired with a 2nd skin layer.
  • the resin S1 contained in the first skin layer and the resin S2 contained in the second skin layer may be different, but are preferably the same from the viewpoint of suppressing the manufacturing cost of the optical film and suppressing curling. .
  • the absolute value of retardation of the second skin layer is preferably small.
  • the absolute value of the specific in-plane retardation of the second skin layer may be in the same range as the range of the absolute value of the in-plane retardation of the first skin layer.
  • the absolute value of the retardation in the thickness direction of the second skin layer may be in the same range as the range of the absolute value of the retardation in the thickness direction of the first skin layer.
  • the thickness of the second skin layer can be in the same range as the thickness range of the first skin layer from the same viewpoint as the first skin layer. Thereby, the same effect as a 1st skin layer can be acquired in a 2nd skin layer.
  • the thickness of the first skin layer and the thickness of the second skin layer may be different, but are preferably the same from the viewpoint of effectively suppressing curling of the optical film.
  • the optical film may be provided with an arbitrary layer in combination with the above-described core layer, first skin layer, and second skin layer as necessary.
  • the optional layer include a hard coat layer that increases the surface hardness, a mat layer that improves the slipperiness of the film, and an antireflection layer.
  • the optical film preferably does not include any layer. Therefore, the optical film particularly preferably includes only the first skin layer, the core layer, and the second skin layer in this order.
  • the optical film is usually a transparent film and transmits visible light.
  • the specific light transmittance can be appropriately selected according to the use of the optical film.
  • the light transmittance at a wavelength of 420 nm to 780 nm is preferably 85% or more, more preferably 88% or more.
  • the thickness of the optical film is preferably 5 ⁇ m or more, more preferably 15 ⁇ m or more, particularly preferably 25 ⁇ m or more, preferably 50 ⁇ m or less, more preferably 45 ⁇ m or less, and particularly preferably 40 ⁇ m or less.
  • the thickness of the optical film is above the lower limit of the above range, the impact strength of the optical film can be effectively increased, and the water vapor transmission rate can be effectively decreased.
  • the absolute value of the retardation of an optical film can be effectively made small because the thickness of an optical film is below the upper limit of the said range.
  • the manufacturing method of an optical film is not specifically limited, Arbitrary manufacturing methods can be employ
  • an optical film can be manufactured by preparing Resin C, Resin S1, and Resin S2 and molding them into a desired shape.
  • the molding method for molding the resin C, the resin S1, and the resin S2 include melt extrusion molding by coextrusion. By performing such melt extrusion molding, an optical film having a desired thickness of each layer can be efficiently produced.
  • the temperature of the resin at the time of melt extrusion molding by co-extrusion is not particularly limited and is a temperature at which each resin can be melted and is suitable for molding.
  • the temperature can be set as appropriate. Specifically, it is preferably Tg + 80 ° C. or higher, more preferably Tg + 100 ° C. or higher, preferably Tg + 180 ° C. or lower, more preferably Tg + 170 ° C. or lower.
  • Tg represents the highest temperature among the glass transition temperatures of the resin C, the resin S1, and the resin S2.
  • the fluidity of the resin can be sufficiently increased to improve the moldability, and by setting the extrusion temperature to be equal to or lower than the upper limit value, deterioration of the resin can be suppressed.
  • the thickness of the layer formed of the resin S1, the layer formed of the resin C, and the layer formed of the resin S2 is increased.
  • a multilayer film with this order in the direction is obtained.
  • This multilayer film is usually obtained as a long film.
  • the multilayer film thus obtained can be used as an optical film as it is. Moreover, you may use arbitrary processing as needed for the said multilayer film, and what was obtained by it may be used as an optical film.
  • optical film described above can be suitably used as a protective film for protecting other layers in a display device such as a liquid crystal display device.
  • the optical film is suitable as a polarizer protective film and particularly suitable as an inner polarizer protective film of a display device.
  • the polarizing plate includes a polarizer and the optical film described above.
  • the optical film can function as a polarizer protective film.
  • the polarizing plate may further include an adhesive layer for adhering them between the optical film and the polarizer.
  • the polarizer is not particularly limited, and any polarizer can be used.
  • the polarizer include those obtained by adsorbing a material such as iodine or a dichroic dye on a polyvinyl alcohol film and then stretching the material.
  • the adhesive constituting the adhesive layer include those using various polymers as a base polymer. Examples of such base polymers include acrylic polymers, silicone polymers, polyesters, polyurethanes, polyethers, and synthetic rubbers.
  • the polarizing plate can usually be provided with one layer of polarizer and two layers of protective films provided on both sides thereof. Of the two protective films, both may be the optical film described above, or only one of the optical films described above.
  • a protective film used at a position closer to the light source side than a polarizer on the display surface side optical It is particularly preferred to provide a film.
  • liquid crystal display devices suitable for providing the polarizing plate include in-plane switching (IPS) mode, vertical alignment (VA) mode, multi-domain vertical alignment (MVA) mode, and continuous spin wheel alignment (CPA).
  • IPS in-plane switching
  • VA vertical alignment
  • MVA multi-domain vertical alignment
  • CPA continuous spin wheel alignment
  • a liquid crystal display device having a liquid crystal cell of a driving method such as a mode, a hybrid alignment nematic (HAN) mode, a twisted nematic (TN) mode, a super twisted nematic (STN) mode, an optically compensated bend (OCB) mode, and the like.
  • a liquid crystal display device including an IPS mode liquid crystal cell is particularly preferable because light leakage at an oblique viewing angle by the optical film and the effect of suppressing color unevenness are remarkable.
  • FIG. 2 is a perspective view schematically showing an apparatus for measuring the impact strength of an optical film used in Examples and Comparative Examples.
  • FIG. 3 is sectional drawing which shows typically the measuring apparatus of the impact strength of the optical film used by the Example and the comparative example.
  • the impact strength of the optical film was measured using the measuring apparatus shown in FIGS.
  • the film 10a as a test piece was horizontally fixed by a jig including an upper clamp ring 201 and a lower clamp ring 202 having a hollow cylindrical shape.
  • the inner diameter (indicated by arrow A3) of the upper clamp ring 201 and the lower clamp ring 202 was 4 cm.
  • a steel ball 211 (pachinko ball, weight 5 g, diameter 11 mm) as a striker from various heights h to a position 15P on the central axis in the jig of the upper surface 10U of the film 10a fixed to the jig, Freely dropped in the direction of arrow A1.
  • the height h represents the distance between the lowest level H1 of the steel ball 211 and the upper surface 10U of the film 10a. This height h is indicated by an arrow A2 in FIG.
  • the height h of the boundary when the film 10a was not torn and when the film 10a was torn was examined.
  • the potential energy of the steel ball 211 at the boundary height h was defined as impact strength.
  • FIG. 4 is a cross-sectional view schematically showing a cross section obtained by cutting the trimming blades 1 and 2 used in Examples and Comparative Examples along a plane perpendicular to the film conveying direction.
  • the optical film was trimmed while being transported horizontally.
  • this trimming is performed by a set of a circular dish-shaped blade 1 disposed above the optical film 3 in the gravity direction and a vertical blade 2 disposed below the optical film 3 in the gravity direction. went. Further, the set of the plate-shaped blade 1 and the scissor blade 2 was disposed so that the outer periphery of the scissor blade 2 was in contact with the optical film 3.
  • two sets of the set of the plate-shaped blade 1 and the scissors-shaped blade 2 were installed at both ends in the width direction of the optical film 3, one in total.
  • continuous trimming of the optical film 3 is achieved at a portion entering between the dish-shaped blade 1 and the saddle-shaped blade 2.
  • trimming of the optical film 3 was continued for 30 minutes.
  • rupture was determined to be "good”, and what the optical film 3 fractured
  • the breakage of the optical film 3 refers to a phenomenon in which the optical film 3 is cut in a direction other than the longitudinal direction that is the transport direction.
  • the refractive index at the wavelength of 590 nm was measured in each of the sample film extrusion direction, the in-plane direction perpendicular to the extrusion direction, and the thickness direction. Then, as the average of the refractive index in the extrusion direction, the in-plane direction perpendicular to the extrusion direction, and the thickness direction, the average refractive index at a wavelength of 590 nm of the sample film is obtained, and this is the average of the layers corresponding to the sample film Refractive index.
  • the average refractive index n total of the optical film was calculated as a weighted average based on the layer thickness ratio of the average refractive index of each layer included in the optical film. Specifically, an average refractive index n total at a measurement wavelength of 590 nm of the optical film was calculated from the following formula (X).
  • n total n s1 ⁇ ⁇ d s1 / (d s1 + d c + d s2) ⁇ + n c ⁇ ⁇ d c / (d s1 + d c + d s2) ⁇ + n s2 ⁇ ⁇ d s2 / (d s1 + d c + d s2) ⁇ (X)
  • n s1 represents an average refractive index at a measurement wavelength of 590nm of the first skin layer
  • d s1 represents the thickness of the first skin layer
  • n c is the core layer measurement wavelength 590nm represents the average refractive index at
  • d c represents the thickness of the core layer
  • n s2 represents the average refractive index at a measurement wavelength of 590nm of the second skin layer
  • d s2 represents the thickness of the second skin layer.
  • R0 and R40 of the optical film were measured at a measurement wavelength of 590 nm using a measuring device (“AxoScan” manufactured by AXOMETRICS).
  • the retardation in the thickness direction of the optical film at a measurement wavelength of 590 nm was calculated from R0 and R40 of the optical film and the average refractive index n total of the optical film.
  • the average refractive index n ave of the sample film was calculated as a weighted average based on the layer thickness ratio of the average refractive index of each layer included in the sample film. Specifically, an average refractive index n ave at a measurement wavelength of 590 nm of the sample film was calculated from the following formula (Y).
  • n ave n c ⁇ ⁇ d c / (d c + d s2 ) ⁇ + n s2 ⁇ ⁇ d s2 / (d c + d s2 ) ⁇ (Y) (In the formula (Y), the symbols have the same meaning as in the formula (X).)
  • R0 and R40 of this sample film were measured at a measurement wavelength of 590 nm using a measuring device (“AxoScan” manufactured by AXOMETRICS).
  • In-plane retardation and retardation in the thickness direction of the sample film at a measurement wavelength of 590 nm were calculated from R0 and R40 of the sample film and the average refractive index n ave of the sample film. Then, by taking the difference between the in-plane retardation of the optical film including the first skin layer and the retardation in the thickness direction, the difference between the in-plane retardation of the sample film not including the first skin layer and the retardation in the thickness direction is obtained. The in-plane retardation and the thickness direction retardation of the skin layer were determined.
  • the second skin layer was removed from the sample film using sandpaper # 100, and the surface was further smoothed with sandpaper # 2000 to obtain a core layer.
  • R0 and R40 of the core layer, and the average refractive index n c of the core layer was calculated retardations plane retardation and the thickness direction of the core layer at a measurement wavelength of 590 nm.
  • the in-plane retardation and thickness direction retardation of the core layer are obtained. The retardation of was calculated
  • the optical film was subjected to corona treatment with a discharge amount of 50 W ⁇ min / m 2 using a corona treatment device (Kasuga Denki Co., Ltd.).
  • the corona-treated surface of the optical film and the polarizer are bonded with an optical film subjected to corona treatment and a polyvinyl alcohol polarizer (thickness: 23 ⁇ m) via an adhesive (“GOHSEIMER Z200” manufactured by Nippon Gosei Kagaku Co., Ltd.).
  • the two layers were stacked with the one surface facing each other and bonded using a roll laminator.
  • a polarizer having a thickness of 40 ⁇ m formed of a resin containing an alicyclic structure-containing polymer subjected to corona treatment under the same conditions as described above (manufactured by Zeon Corporation; glass transition temperature 126 ° C.).
  • the protective film was overlapped with an adhesive solution and bonded using a roll laminator. This obtained the polarizing plate which has a layer structure of (polarizer protective film) / (adhesive layer) / (polarizer) / (adhesive layer) / (optical film).
  • a commercially available television was prepared as an IPS type liquid crystal display device.
  • the polarizing plate on the viewer side of this television (that is, the polarizing plate closer to the display surface) was removed, and instead the polarizing plate produced using the optical film produced in the example or comparative example was attached. Thereafter, the television was displayed in black and the display surface was observed. The observation was performed in the range of the azimuth angle of 0 ° to 180 ° from the direction where the polar angle of the display surface was approximately 40 °. As a result of observation, if the color of the display surface looks bluish, it was determined as “bad”, and if the color could not be confirmed, it was determined as “good”.
  • the polarizing plate produced as described in [Method for evaluating viewing angle characteristics] was observed with the naked eye. As a result of observation, irregularities on the surface of the optical film were not confirmed, and the appearance was good.
  • the polarizing plate was cut into a 100 mm square to obtain a square film piece.
  • the obtained film piece was allowed to stand for 100 hours in a high temperature and humidity chamber adjusted to a temperature of 60 ° C. and a humidity of 90%. Thereafter, the film piece was taken out from the high temperature and humidity chamber and placed on flat glass. At this time, when the end of the film piece was lifted by 2 mm or more due to curling of the film piece, it was determined as “bad”, and when the lift amount was less than 2 mm, it was determined as “good”.
  • This block copolymer had a weight average molecular weight (Mw) of 70,900 and a molecular weight distribution (Mw / Mn) of 1.5.
  • the molten polymer was extruded into a strand form from a die, cooled, and pellets of resin I containing polymer X were produced using a pelletizer.
  • the polymer X contained in the obtained pellet-like resin I had a weight average molecular weight (Mw) of 62,200, a molecular weight distribution (Mw / Mn) of 1.5, and a hydrogenation rate of almost 100%.
  • the number average molecular weight (Mn) and weight average molecular weight (Mw) of the resulting ring-opened polymer of dicyclopentadiene are 8,750 and 28,100, respectively, and the molecular weight distribution (Mw / Mn) determined from these. was 3.21.
  • a filter aid (“Radiolite (registered trademark) # 1500” manufactured by Showa Chemical Industry Co., Ltd.) was added, and a PP pleated cartridge filter (“TCP-HX” manufactured by ADVANTEC Toyo Co., Ltd.) was used. The solution was filtered off.
  • a filter aid (“Radiolite (registered trademark) # 1500” manufactured by Showa Chemical Industry Co., Ltd.) was added, and a PP pleated cartridge filter (“TCP-HX” manufactured by ADVANTEC Toyo Co., Ltd.) was used. The solution was filtered off.
  • a hydride of a ring-opening polymer of dicyclopentadiene having crystallinity is obtained by separating the hydride and the solution contained in the reaction solution using a centrifugal separator and drying under reduced pressure at 60 ° C. for 24 hours. 5 parts were obtained.
  • the hydride had a hydrogenation rate of 99% or more, a glass transition temperature Tg of 95 ° C., a crystallization temperature Tc of 180 ° C., a melting point Mp of 262 ° C., and a ratio of racemo dyad of 89%.
  • This resin II was put into a twin screw extruder (“TEM-37B” manufactured by Toshiba Machine Co., Ltd.) having four die holes with an inner diameter of 3 mm ⁇ .
  • the resin was molded into a strand-shaped molded body by hot melt extrusion molding using the above-described twin-screw extruder.
  • the molded body was chopped with a strand cutter to obtain resin II pellets containing a hydride of a ring-opening polymer of dicyclopentadiene.
  • the operating conditions of the above twin screw extruder are shown below. ⁇ Barrel set temperature: 270 °C ⁇ 280 °C ⁇ Die setting temperature: 250 °C ⁇ Screw speed: 145rpm ⁇ Feeder rotation speed: 50 rpm
  • Example 1 Resin I produced in Production Example 1 was charged into a hopper. Then, the charged resin I was supplied to the multi-manifold die as the resin C for the core layer.
  • the resin II produced in Production Example 2 was put into another hopper.
  • the charged resin II was supplied to the multi-manifold die as a first skin layer resin S1 and a second skin layer resin S2.
  • the resin C for the core layer, the resin S1 for the first skin layer, and the resin S2 for the second skin layer were extruded from the multi-manifold die into a film in a molten state.
  • the extruded resin was cast on a cooling roll and cooled to produce a film having a first skin layer / core layer / second skin layer in this order.
  • the temperature of the melt extrusion was set in the range of TgC + 50 ° C. to TgC + 200 ° C., where TgC is the glass transition temperature of the resin C for the core layer.
  • both ends in the width direction were removed by trimming to obtain a long optical film having a film width of about 600 mm.
  • the obtained optical film was evaluated by the method described above.
  • Example 2 The thicknesses of the core layer, the first skin layer, and the second skin layer were changed as shown in Table 1 by adjusting the extrusion amounts of the resin C, the resin S1, and the resin S2 in the multi-manifold die. Except for the above, the optical film was manufactured and evaluated in the same manner as in Example 1.
  • Example 3 Instead of the resin II produced in Production Example 2 as the resin S1 for the first skin layer and the resin S2 for the second skin layer, a resin III (norbornene) containing an alicyclic structure-containing polymer having no crystallinity is used. Polymer: “ZEONOR” manufactured by Nippon Zeon Co., Ltd .; glass transition temperature 126 ° C.) was used. Further, the thicknesses of the core layer, the first skin layer, and the second skin layer were changed as shown in Table 1 by adjusting the extrusion amounts of the resin C, the resin S1, and the resin S2 in the multi-manifold die. Except for the above, the optical film was manufactured and evaluated in the same manner as in Example 1.
  • Example 4 As resin S1 for the first skin layer and resin S2 for the second skin layer, a resin IV (norbornene polymer; Nippon Zeon Co., Ltd.) containing an alicyclic structure-containing polymer having no crystallinity instead of resin III “ZEONOR” (glass transition temperature: 163 ° C.) was used. Further, the thicknesses of the first skin layer and the second skin layer were changed as shown in Table 1 by adjusting the extrusion amounts of the resin C, the resin S1, and the resin S2 in the multi-manifold die. Except for the above, the optical film was manufactured and evaluated in the same manner as in Example 3.
  • ZEONOR glass transition temperature: 163 ° C.
  • Example 3 The same resin III as used in Example 3 was used as the resin C for the core layer, the resin S1 for the first skin layer, and the resin S2 for the second skin layer. Except for the above items, the same operation as in Example 1 was carried out to produce and evaluate an optical film having a single-layer structure provided with only a layer formed of resin III.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Polarising Elements (AREA)
  • Laminated Bodies (AREA)

Abstract

L'invention concerne un film optique ayant une valeur absolue de retard dans la direction de l'épaisseur de 3 nm ou moins, une résistance aux chocs de 2 × 10-2 J ou plus, et une transmittance de vapeur d'eau de 10 g/(m2·24 h) ou moins.
PCT/JP2017/046794 2016-12-28 2017-12-26 Film optique et plque polarisante WO2018124137A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2018559548A JPWO2018124137A1 (ja) 2016-12-28 2017-12-26 光学フィルム及び偏光板
CN201780066644.2A CN109923448B (zh) 2016-12-28 2017-12-26 光学膜和偏振片
KR1020197016612A KR102638927B1 (ko) 2016-12-28 2017-12-26 광학 필름 및 편광판

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2016-256101 2016-12-28
JP2016256101 2016-12-28

Publications (1)

Publication Number Publication Date
WO2018124137A1 true WO2018124137A1 (fr) 2018-07-05

Family

ID=62709397

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2017/046794 WO2018124137A1 (fr) 2016-12-28 2017-12-26 Film optique et plque polarisante

Country Status (5)

Country Link
JP (1) JPWO2018124137A1 (fr)
KR (1) KR102638927B1 (fr)
CN (1) CN109923448B (fr)
TW (1) TWI742219B (fr)
WO (1) WO2018124137A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022145174A1 (fr) * 2020-12-28 2022-07-07 日本ゼオン株式会社 Film optique et son procédé de fabrication

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003136635A (ja) * 2001-11-01 2003-05-14 Nippon Zeon Co Ltd 積層構造体及び位相差フィルム
JP2009052036A (ja) * 2007-07-30 2009-03-12 Toray Ind Inc アクリル系フィルム、積層フィルムおよび偏光板
JP2009125984A (ja) * 2007-11-20 2009-06-11 Mitsui Chemicals Inc 積層体
JP2011194647A (ja) * 2010-03-18 2011-10-06 Nippon Steel Chem Co Ltd 積層体フィルム
JP2013033237A (ja) * 2011-07-01 2013-02-14 Asahi Kasei Chemicals Corp 光学等方性偏光膜保護フィルム及び偏光板
WO2015037456A1 (fr) * 2013-09-12 2015-03-19 富士フイルム株式会社 Couche optique, couche conductrice transparente, panneau tactile, couche de protection de surface et dispositif d'affichage
JP2016504614A (ja) * 2013-06-18 2016-02-12 エルジー・ケム・リミテッド 多層光学フィルム、その製造方法およびこれを含む偏光板
WO2016024553A1 (fr) * 2014-08-11 2016-02-18 電気化学工業株式会社 Copolymère approprié pour améliorer la résistance à la chaleur d'une résine méthacrylique

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW200420979A (en) * 2003-03-31 2004-10-16 Zeon Corp Protective film for polarizing plate and method for preparation thereof
TWI529428B (zh) * 2004-11-09 2016-04-11 Zeon Corp Polarizing plate and liquid crystal display device
JP2007226109A (ja) * 2006-02-27 2007-09-06 Nippon Zeon Co Ltd 光学フィルム、位相差板、偏光板、液晶表示素子用基板及び液晶表示素子
JP2008274136A (ja) * 2007-04-27 2008-11-13 Fujifilm Corp シクロオレフィン樹脂フィルム、およびこれらを用いた偏光板、光学補償フィルム、反射防止フィルム、液晶表示装置
JP2009214341A (ja) * 2008-03-07 2009-09-24 Nippon Zeon Co Ltd 延伸積層フィルム、偏光板、及び液晶表示装置
JP5487759B2 (ja) * 2009-06-30 2014-05-07 日本ゼオン株式会社 フィルム及びその製造方法
JP5417452B2 (ja) * 2009-11-13 2014-02-12 三井化学株式会社 フィルムおよびその用途
CN104395792A (zh) * 2013-06-18 2015-03-04 Lg化学株式会社 多层光学膜,其制备方法和包括所述多层光学膜的偏光片
KR102179714B1 (ko) * 2013-08-30 2021-03-25 가부시키가이샤 닛폰 쇼쿠바이 (메타)아크릴계 수지

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003136635A (ja) * 2001-11-01 2003-05-14 Nippon Zeon Co Ltd 積層構造体及び位相差フィルム
JP2009052036A (ja) * 2007-07-30 2009-03-12 Toray Ind Inc アクリル系フィルム、積層フィルムおよび偏光板
JP2009125984A (ja) * 2007-11-20 2009-06-11 Mitsui Chemicals Inc 積層体
JP2011194647A (ja) * 2010-03-18 2011-10-06 Nippon Steel Chem Co Ltd 積層体フィルム
JP2013033237A (ja) * 2011-07-01 2013-02-14 Asahi Kasei Chemicals Corp 光学等方性偏光膜保護フィルム及び偏光板
JP2016504614A (ja) * 2013-06-18 2016-02-12 エルジー・ケム・リミテッド 多層光学フィルム、その製造方法およびこれを含む偏光板
WO2015037456A1 (fr) * 2013-09-12 2015-03-19 富士フイルム株式会社 Couche optique, couche conductrice transparente, panneau tactile, couche de protection de surface et dispositif d'affichage
WO2016024553A1 (fr) * 2014-08-11 2016-02-18 電気化学工業株式会社 Copolymère approprié pour améliorer la résistance à la chaleur d'une résine méthacrylique

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022145174A1 (fr) * 2020-12-28 2022-07-07 日本ゼオン株式会社 Film optique et son procédé de fabrication

Also Published As

Publication number Publication date
CN109923448B (zh) 2021-04-23
JPWO2018124137A1 (ja) 2019-10-31
KR20190099400A (ko) 2019-08-27
TWI742219B (zh) 2021-10-11
KR102638927B1 (ko) 2024-02-20
CN109923448A (zh) 2019-06-21
TW201831323A (zh) 2018-09-01

Similar Documents

Publication Publication Date Title
WO2018101204A1 (fr) Plaque polarisante et procédé pour fabriquer une plaque polarisante
JP6911766B2 (ja) 光学フィルム及び偏光板
WO2017115776A1 (fr) Corps optique stratifié, plaque de polarisation et dispositif d'affichage à cristaux liquides
WO2018124137A1 (fr) Film optique et plque polarisante
JP6992759B2 (ja) 光学フィルム及びその製造方法、並びに偏光板
CN108351456B (zh) 光学膜和偏振片
JP6477921B2 (ja) 光学積層体、偏光板及び表示装置の製造方法
JP6891902B2 (ja) 積層フィルム、その製造方法、偏光板、及び表示装置
KR102607190B1 (ko) 광학 필름, 그 제조 방법, 편광판, 및 액정 표시 장치
KR102685094B1 (ko) 광학 필름 및 편광판
WO2018180498A1 (fr) Film optique, plaque de polarisation et procédé de production
JP2018069613A (ja) 積層フィルム、製造方法、偏光板、及び表示装置
JP2018097121A (ja) 複合フィルム、製造方法、偏光板、及び表示装置
JP2018097110A (ja) 複合フィルム、製造方法、偏光板、及び表示装置

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 17888287

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 2018559548

Country of ref document: JP

Kind code of ref document: A

ENP Entry into the national phase

Ref document number: 20197016612

Country of ref document: KR

Kind code of ref document: A

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 17888287

Country of ref document: EP

Kind code of ref document: A1