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WO2018180498A1 - Film optique, plaque de polarisation et procédé de production - Google Patents

Film optique, plaque de polarisation et procédé de production Download PDF

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Publication number
WO2018180498A1
WO2018180498A1 PCT/JP2018/009997 JP2018009997W WO2018180498A1 WO 2018180498 A1 WO2018180498 A1 WO 2018180498A1 JP 2018009997 W JP2018009997 W JP 2018009997W WO 2018180498 A1 WO2018180498 A1 WO 2018180498A1
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WO
WIPO (PCT)
Prior art keywords
optical film
film
block
rth
polarizing plate
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2018/009997
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English (en)
Japanese (ja)
Inventor
宏晃 周
恭輔 井上
泰秀 藤野
浩成 摺出寺
斗馬 辻野
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zeon Corp
Original Assignee
Zeon Corp
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Filing date
Publication date
Application filed by Zeon Corp filed Critical Zeon Corp
Priority to CN201880018399.2A priority Critical patent/CN110418987A/zh
Priority to JP2019509226A priority patent/JPWO2018180498A1/ja
Priority to KR1020197027642A priority patent/KR20190127748A/ko
Publication of WO2018180498A1 publication Critical patent/WO2018180498A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
    • B29C55/04—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique
    • B29C55/08—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique transverse to the direction of feed
    • 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
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • 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
    • 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
    • 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

Definitions

  • the present invention relates to an optical film, a polarizing plate, and a production method thereof.
  • optical films having a small retardation are known as examples of such optical films (for example, Patent Documents 1 to 3).
  • Such a low retardation optical film can be used as a protective film for protecting a polarizer in a polarizing plate.
  • a display device having good viewing angle characteristics can be configured by using a low retardation optical film as a polarizer protective film.
  • JP 2010-286841 A (corresponding publication: US Patent Application Publication No. 2008/309860) JP 2011-13378 A JP-T-2011-523668 (corresponding publication: US Patent Application Publication No. 2011/038045)
  • the low retardation optical film is required to be capable of manufacturing and processing the film with high efficiency and high durability of the film in addition to the small retardation. For example, it is required that the film can be easily produced as a long film having a large area by stretching, and that the film can be easily cut and conveyed without causing defects. Moreover, it is calculated
  • an object of the present invention is an optical film having a small phase difference, can be easily produced as a long film having a large area by stretching, can be easily cut and conveyed, and has high durability, and a method for producing the same. Is to provide.
  • a further object of the present invention is to provide a polarizing plate that can realize a display device with good viewing angle characteristics, can be easily manufactured, and has high durability.
  • the present invention is as follows.
  • An optical film made of a stretched resin which satisfies the following formulas (1) to (4): 0 nm ⁇ Re (590) ⁇ 3 nm (1)
  • Re (400) is an in-plane retardation at a wavelength of 400 nm of the optical film
  • Re (590) is an in-plane retardation at a wavelength of 590 nm of the optical film
  • Re (800) is the in-plane retardation at a wavelength of 800 nm of the optical film
  • Rth (400) is the thickness direction retardation of the optical film at a wavelength of 400 nm
  • Rth (590) is a retardation in the thickness direction at a wavelength of 590 nm of the optical film
  • Rth (800) is a thickness direction retardation of the optical film at
  • the tensile modulus is 1500 MPa or more, An optical film having a tear strength of 0.6 N / mm or more.
  • the polymer is One block B per molecule having the diene compound hydride unit (b); One block A1 per molecule connected to one end of the block B and having the aromatic vinyl compound hydride unit (a);
  • the optical film according to [2] which is a triblock copolymer that is connected to the other end of the block B and includes one block A2 per molecule having the aromatic vinyl compound hydride unit (a). .
  • the ratio (A1 + A2) / B of the total weight of the block A1 and the block A2 to the weight of the block B is 80/20 or more and 88/12 or less.
  • the aromatic vinyl compound hydride unit (a) is a structural unit having a structure obtained by polymerizing styrene and hydrogenating, The optical film according to any one of [2] to [4], wherein the diene compound hydride unit (b) is a structural unit having a structure obtained by polymerizing and hydrogenating isoprene.
  • a polarizing plate comprising a polarizer and the optical film described in any one of [1] to [5].
  • the glass transition temperature of the resin is Tg,
  • the manufacturing method including extending
  • an optical film that has a small retardation can be easily manufactured as a long film with a large area by stretching, can be easily cut and conveyed, and has high durability, and a manufacturing method thereof are provided. can do.
  • FIG. 1 is a rear view of the trimming apparatus used for trimming in the embodiment as viewed from the downstream side in the conveyance direction of the optical film.
  • a chain hydrocarbon compound is a hydrocarbon compound that does not contain a cyclic structure such as an aromatic ring, cycloalkane, or cycloalkene.
  • nx represents a refractive index in a direction (in-plane direction) perpendicular to the thickness direction of the film and giving the maximum refractive index.
  • ny represents the refractive index in the in-plane direction of the film and perpendicular to the nx direction.
  • nz represents the refractive index in the thickness direction of the film.
  • d represents the thickness of the film.
  • 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 optical film of the present invention is made of a stretched resin.
  • a film made of a stretched resin is a film obtained by stretching a resin by forming it into a film shape and further subjecting it to a stretching process.
  • a film before being subjected to such a stretching process may be referred to as a “film before stretching”.
  • the resin constituting the optical film may be a resin containing a block copolymer having an aromatic vinyl compound hydride unit (a) and a diene compound hydride unit (b).
  • a copolymer may be simply referred to as a block copolymer.
  • a resin containing a block copolymer may be simply referred to as a block copolymer resin.
  • the block copolymer has one diene compound hydride unit (b), one block B per molecule, and one molecule connected to one end of the block B and having an aromatic vinyl compound hydride unit (a).
  • a triblock copolymer comprising one block A1 and one block A2 connected to the other end of the block B and having an aromatic vinyl compound hydride unit (a) may be used.
  • the aromatic vinyl compound hydride unit (a) is a repeating unit having the same structure as a repeating unit obtained by polymerizing an aromatic vinyl compound and then hydrogenating an unsaturated bond thereof.
  • the aromatic vinyl compound hydride unit (a) is not limited depending on the production method. In the following examples of units, those having stereoisomers can use any of the stereoisomers.
  • Blocks A1, A2 and B may include a plurality of different types of units. Further, the block copolymer may be a mixture of plural kinds of polymers including plural kinds of different blocks. The structure of the block copolymer, the hydrogenation rate, etc. can be confirmed by NMR method.
  • 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.
  • 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.
  • the molecular weight of each of the blocks A1 and A2 is preferably 1000 or more, more preferably 2000 or more, even more preferably 3000 or more, preferably 100,000 or less, more preferably 90000 or less, and even more preferably 80000 or less.
  • the molecular weight of block A1 and the molecular weight of block A2 may be the same or different.
  • the aromatic vinyl compound hydride unit (a) is a structural unit having a structure obtained by polymerizing styrene and hydrogenating it. More specifically, a preferred example of the aromatic vinyl compound hydride unit (a) includes a unit represented by the following structural formula (1-1).
  • the diene compound hydride unit (b) has the same structure as the repeating unit obtained by polymerizing the diene compound and then hydrogenating the unsaturated bond if the resulting polymer has an unsaturated bond. It is a repeating unit having.
  • the diene compound hydride unit (b) is preferably a repeating unit having the same structure as the repeating unit obtained by polymerizing the conjugated diene compound and then hydrogenating the unsaturated bond.
  • Examples of the diene compound hydride unit (b) include a unit represented by the following structural formula (2) and a unit represented by the structural formula (3). However, the diene compound hydride unit (b) is not limited depending on its production method.
  • 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. Or a chain hydrocarbon group substituted with a polar group (halogen atom, alkoxy group, hydroxyl group, ester group, cyano group, amide group, imide group, or 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. Or a chain hydrocarbon group substituted with a polar group (halogen atom, alkoxy group, hydroxyl group, ester group, cyano group, amide group, imide group, or 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 viewpoint 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.
  • the molecular weight of the block B is preferably 500 or more, more preferably 1000 or more, still more preferably 2000 or more, preferably 50000 or less, more preferably 30000 or less, and even more preferably 20000 or less.
  • the diene compound hydride unit (b) is a structural unit having a structure obtained by polymerizing isoprene and hydrogenating it. More specifically, units represented by the following structural formulas (2-1) to (2-3) can be given.
  • the ratio (A1 + A2) / B of the total weight of the block A1 and the block A2 to the weight of the block B is preferably 80/20 or more, more preferably 82/18 or more, preferably Is 88/12 or less, more preferably 86/14 or less.
  • the triblock copolymer may have any block other than the blocks A1, A2 and B as long as the effects of the present invention are not significantly impaired.
  • the triblock copolymer may also contain any unit other than the aromatic vinyl compound hydride unit (a) and the diene compound hydride unit (b) as long as the effects of the present invention are not significantly impaired.
  • the number of the arbitrary blocks and the arbitrary units is preferably small.
  • the weight ratio of the arbitrary block in the triblock copolymer is not uniform depending on the use of the film, but is preferably 10% by weight or less, more preferably 5% by weight or less, and even more preferably 3% by weight or less. It is particularly preferred that any block is not included.
  • the weight ratio of the arbitrary unit in the triblock copolymer is not uniform depending on the use of the film, but is preferably 10% by weight or less, more preferably 5% by weight or less, and even more preferably 3% by weight or less. It is particularly preferred that any unit is not included.
  • the weight average molecular weight Mw of the triblock copolymer is preferably 50,000 or more, more preferably 55,000 or more, still more preferably 60,000 or more, preferably 100,000 or less, more preferably 90, 000 or less, and more preferably 80,000 or less.
  • the weight average molecular weight Mw is equal to or higher than the lower limit, the impact resistance of the film can be improved, and when the weight average molecular weight Mw is equal to or lower than the upper limit, the viscosity of the polymer can be lowered and the moldability can be improved.
  • the molecular weight distribution (weight average molecular weight (Mw) / number average molecular weight (Mn)) of the triblock copolymer is preferably 2 or less, more preferably 1.7 or less, and even more preferably 1.5 or less. When Mw / Mn is within such a range, the polymer viscosity can be lowered to improve the moldability.
  • the glass transition temperature Tg A of the triblock copolymer is preferably 110 ° C. or higher, more preferably 115 ° C. or higher, even more preferably 120 ° C. or higher, preferably 150 ° C. or lower, more preferably 148 ° C. or lower, More preferably, it is 145 degrees C or less.
  • the glass transition temperature of the triblock copolymer is at least the above lower limit, the advantage that the heat resistance of the film is improved is obtained, and when it is not more than the upper limit, the advantage is obtained that the processing temperature is lowered and the moldability is increased.
  • As the glass transition temperature Tg A of the triblock copolymer a higher numerical value can be adopted when a plurality of glass transition temperatures are observed.
  • the block copolymer is prepared by preparing monomers corresponding to each of the aromatic vinyl compound hydride block and the diene compound hydride block, and performing block polymerization to obtain a polymer, and then hydrogenating the obtained polymer. It can manufacture by performing.
  • Examples of monomers corresponding to aromatic vinyl compound hydride blocks include styrene, ⁇ -methyl styrene, ⁇ -ethyl styrene, ⁇ -propyl styrene, ⁇ -isopropyl styrene, ⁇ -t-butyl styrene, 2-methyl.
  • Styrene 3-methylstyrene, 4-methylstyrene, 2,4-diisopropylstyrene, 2,4-dimethylstyrene, 4-t-butylstyrene, 5-t-butyl-2-methylstyrene, monochlorostyrene, dichlorostyrene, Styrenes such as monofluorostyrene and 4-phenylstyrene; vinylcyclohexanes such as vinylcyclohexane and 3-methylisopropenylcyclohexane; 4-vinylcyclohexene, 4-isopropenylcyclohexene, 1-methyl-4-vinylcyclohexene, 1- Methyl-4-isop And vinylcyclohexenes such as lopenylcyclohexene, 2-methyl-4-vinylcyclohexene, 2-methyl-4-isopropenylcyclohexene; and combinations thereof.
  • Examples of monomers corresponding to diene compound hydride blocks include chain conjugated dienes such as butadiene, isoprene, 2,3-dimethyl-1,3-butadiene, 1,3-pentadiene, and 1,3-hexadiene. Class; these combinations are listed alongside.
  • Polymerization and hydrogenation can be carried out, for example, by the method described in JP2011-13378.
  • the resin constituting the optical film may contain an optional component other than the block copolymer.
  • optional components include ultraviolet absorbers; inorganic fine particles; stabilizers such as antioxidants, heat stabilizers and near infrared absorbers; resin modifiers such as lubricants and plasticizers; colorants such as dyes and pigments; Antistatic agents; and combinations thereof.
  • the amount of the optional component is preferably small.
  • the specific amount of the optional component depends on the use and thickness of the film of the present invention, but is preferably 10 parts by weight or less, more preferably 5 parts by weight or less, for example, with respect to 100 parts by weight of the block copolymer. More preferred are parts by weight or less. Among these, it is particularly preferable that other components are not included.
  • the optical film of the present invention satisfies the following formulas (1) to (4). 0 nm ⁇ Re (590) ⁇ 3 nm (1)
  • Re (400) is an in-plane direction retardation of the optical film at a wavelength of 400 nm
  • Re (590) is an in-plane direction retardation of the optical film at a wavelength of 590 nm
  • Re (800) is Rth (400) is the thickness direction retardation of the optical film at a wavelength of 400 nm
  • Rth (590) is the thickness of the optical film at a wavelength of 590 nm.
  • Rth (800) is the thickness direction retardation of the optical film at a wavelength of 800 nm.
  • Re (590) is 3 nm or less, preferably 2 nm or less.
  • the lower limit of Re (590) is ideally 0 nm.
  • is 3 nm or less, preferably 1 nm or less.
  • the lower limit of Rth (590) is ideally 0 nm.
  • is 1 nm or less, preferably 0.8 nm or less.
  • is ideally 0 nm.
  • is 1 nm or less, preferably 0.8 nm or less.
  • is ideally 0 nm.
  • the optical film of the present invention can be preferably used in applications such as a polarizer protective film as a low retardation optical film by satisfying the formulas (1) to (4).
  • the optical film of the present invention has a tensile modulus and tear strength within a specific range.
  • the tensile elastic modulus is 1500 MPa or more, preferably 1600 MPa or more, and the tear strength is 0.6 N / mm or more, preferably 0.8 N / mm or more.
  • the upper limit of a tensile elasticity modulus is not specifically limited, For example, it can be 4000 MPa or less.
  • the upper limit of the tear strength is not particularly limited, but may be, for example, 2.0 N / mm or less.
  • optical film having the optical properties and mechanical properties described above can be easily selected by appropriately selecting the resin constituting the film from those described above and appropriately selecting the manufacturing conditions from those described below. Can be manufactured.
  • the optical film of the present invention has a total light transmittance of preferably 80% or more, more preferably 90% or more, from the viewpoint of stably exhibiting the function as an optical member.
  • the optical film of the present invention can be produced as a long film and further cut into a desired dimension when used.
  • the dimension in the width direction can be set to, for example, 1000 mm to 3000 mm.
  • the thickness of the optical film of the present invention is preferably 10 ⁇ m or more, more preferably 15 ⁇ m or more, still more preferably 20 ⁇ m or more, preferably 200 ⁇ m or less, more preferably 100 ⁇ m or less, and even more preferably 50 ⁇ m or less.
  • a polarizing plate protective film by making the thickness of the optical film above the lower limit, there is an advantage that handling properties such as prevention of damage to the polarizing plate are improved, and by making the thickness below the upper limit, the polarizing plate is made thin. There is an advantage that can be.
  • the optical film of the present invention is usually a transparent layer and transmits visible light well.
  • the specific light transmittance is not uniform depending on the use of the film of the present invention, the light transmittance at a wavelength of 420 to 780 nm is preferably 85% or more, more preferably 88% or more. Since the optical film has such a high light transmittance at a wavelength of 420 to 780 nm, when the optical film is mounted on a display device such as a liquid crystal display device, it is possible to suppress a decrease in luminance particularly during long-term use.
  • the optical film of the present invention can be produced by a production method in which a pre-stretch film is prepared using the above-described resin as a material and the pre-stretch film is stretched. Preparation and stretching of the pre-stretched film can be performed, for example, by the method described in JP2011-13378A. By stretching, the optical film can be easily produced as a long film having a large area.
  • the optical film of the present invention can be preferably manufactured by a manufacturing method in which a pre-stretch film is stretched at a specific stretch ratio at a specific temperature range.
  • the stretching temperature can be defined as a relative value with respect to the glass transition temperature Tg of the resin constituting the film before stretching.
  • the stretching temperature is preferably (Tg + 10) ° C. or higher, more preferably (Tg + 15) ° C. or higher, preferably (Tg + 45) ° C. or lower, more preferably (Tg + 40) ° C. or lower.
  • the draw ratio is preferably 1.1 times or more, more preferably 1.15 times or more, preferably 3.0 times or less, more preferably 2.75 times or less.
  • the optical film can be made into a long film having a large area by stretching, and the retardation of the optical film can be reduced.
  • the block copolymer resin described above as the resin constituting the optical film, and by setting the stretching temperature and magnification within the specific range described above, the phase difference is small, An optical film that can be easily transported and has high durability can be easily manufactured as a long film having a large area.
  • optical film of the present invention 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 of this invention is suitable as a polarizer protective film, and is especially suitable as an inner side polarizer protective film of a display apparatus.
  • the polarizing plate of the present invention includes a polarizer and the optical film of the present invention.
  • the optical film can function as a polarizer protective film.
  • the polarizing plate of the present invention may further include an adhesive layer for bonding 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 of the present invention can realize a display device having good viewing angle characteristics based on the low phase difference. Since the optical film of the present invention can be easily manufactured and has high durability, the polarizing plate of the present invention can also be easily manufactured and can be a highly polarizing plate.
  • the polarizing plate of the present invention can usually comprise one layer of polarizer and two layers of protective films provided on both sides thereof. Of these two protective films, both may be the optical film of the present invention, and only one of them may be the optical film of the present invention.
  • the optical film of the present invention is used as a protective film used at a position closer to the liquid crystal cell than the polarizer. It is particularly preferred to provide a film.
  • a known protective film can be appropriately selected as the optional protective film.
  • a film made of a resin containing an alicyclic structure-containing polymer can be used. More specifically, a film made of a resin such as “ZEONOR” (manufactured by Nippon Zeon Co., Ltd.) can be used.
  • the liquid crystal display device is not particularly limited, and may be a liquid crystal display device of any type.
  • a liquid crystal display device including an IPS mode liquid crystal cell is particularly preferable because the optical film of the present invention has a remarkable effect of suppressing light leakage at an oblique viewing angle and suppressing color unevenness.
  • Re and Rth of the optical film were measured by using “AxoScan” manufactured by AXOMETRICS at wavelengths of 400, 590, and 800 nm, R 0 (retardation observed from 0 ° polar angle), R 40 (polar angle 40 ° direction).
  • the retardation Re in the in-plane direction and the retardation Rth in the thickness direction were calculated from the retardation observed from 1) and the average refractive index.
  • the tensile elastic modulus of the optical film was measured according to JIS K7162. However, the test piece was prepared according to JIS K7127-1B. The tensile speed was measured as 5 mm / min. Both the measurement by the tension along the longitudinal direction of the long optical film and the measurement by the tension along the width direction were performed, and the average value thereof was taken as the measurement value.
  • the tear strength of the optical film was measured according to the trouser tear method (JIS K7128-1). Both the measurement by tearing along the longitudinal direction of the long optical film and the measurement by tearing along the width direction were performed, and the average value thereof was taken as the measurement value.
  • FIG. 1 is a rear view of the trimming apparatus used for trimming as viewed from the downstream side in the optical film transport direction.
  • the lower blade 122 in FIG. 1 is shown by a longitudinal sectional view taken along a plane passing through the rotation shaft 122C.
  • the trimming device 120 is a pair of devices aligned in the TD direction (direction parallel to the width direction of the film being conveyed).
  • the long optical film is transported in the horizontal direction, and the dish-shaped upper blade 121 disposed on the upper side of the optical film transport path is rotated around the rotation shaft 121C, so that A part of the outer periphery is rotated by rotating a bowl-shaped lower blade 122 with a part thereof in contact with the upper surface of the optical film and arranged on the lower side of the conveyance path of the optical film about the rotation shaft 122C.
  • the rotating shaft 121C of the upper blade 121 and the rotating shaft 122C of the lower blade 122 are both arranged in a direction parallel to the TD direction.
  • the upper blade 121 and the lower blade 122 were overlapped so as to shear the optical film, and the saddle-shaped lower blade 122 was arranged so that the edge protruded to the side surface side of the upper blade 121.
  • a commercially available television receiver was prepared as an IPS type liquid crystal display device.
  • the polarizing plate on the viewing side of this television receiver (that is, the polarizing plate closer to the display surface) was removed, and the polarizing plate produced in the example or comparative example was attached instead.
  • the orientation of the polarizing plate was adjusted so that the optical film was on the light source side and the absorption axis of the polarizer was the same as the orientation of the polarizer in the polarizing plate originally provided in the television receiver.
  • the television receiver was set in a black display state (a state in which a black color was displayed on the entire display surface), 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 with respect to the display surface is about 40 °. As a result of observation, when a color such as a bluish color was confirmed on the display surface, it was determined to be bad, and when the color was not confirmed, it was determined to be good.
  • the polarizing plate produced in the example or the comparative example was cut to obtain a square film piece of 100 mm ⁇ 100 mm.
  • the surface on the optical film side of the obtained film piece was subjected to corona treatment.
  • the corona treatment was performed under the same conditions as those performed in the production of the polarizing plate.
  • the corona-treated surface of the polarizing plate was bonded to an optical glass (Corning EagleXG thickness 0.7 mm) through a layer of an adhesive (CS9621T manufactured by Nitto Denko Corporation) to obtain a bonded product.
  • the paste was subjected to a thermal shock test.
  • the thermal shock test was performed using a thermal shock tester (manufactured by Espec). The conditions of the thermal shock test were 70 ° C. for 30 minutes followed by ⁇ 40 ° C. for 30 minutes, and 100 cycles were repeated. After completion of the thermal shock test, the bonded product was taken out. When the end of the polarizing plate was lifted by 2 mm or more due to the curling of the polarizing plate, it was determined to be defective, and when the lifting amount was less than 2 mm, it was determined to be good.
  • Example 1 (1-1. First stage reaction: elongation of aromatic vinyl compound hydride block A1) A stainless steel reactor equipped with a stirrer and thoroughly dried and purged with nitrogen was charged with 320 parts of dehydrated cyclohexane, 75 parts of styrene and 0.38 part of dibutyl ether, and stirred at 60 ° C. to give an n-butyllithium solution. (15 wt% hexane solution) 0.41 part was added to initiate the polymerization reaction, and the first stage polymerization reaction was carried out for 1 hour. At 1 hour after the start of the reaction, a sample was sampled from the reaction mixture and analyzed by gas chromatography (GC). As a result, the polymerization conversion was 99.5%.
  • GC gas chromatography
  • a mixture containing a copolymer having a triblock molecular structure of styrene-isoprene-styrene was obtained.
  • the mixture containing the block copolymer obtained in the step (1-3) is transferred to a pressure-resistant reactor equipped with a stirrer, and a diatomaceous earth-supported nickel catalyst (manufactured by JGC Catalysts & Chemicals, Inc.) is used as a hydrogenation catalyst.
  • E22U nickel loading 60%
  • 8.0 parts and dehydrated cyclohexane 100 parts were added and mixed.
  • the inside of the reactor was replaced with hydrogen gas, and hydrogen was supplied while stirring the solution.
  • a hydrogenation reaction was performed at a temperature of 190 ° C. and a pressure of 4.5 MPa for 6 hours.
  • a reaction solution containing a block copolymer in which the copolymer was hydrogenated by a hydrogenation reaction was obtained. After completion of the hydrogenation reaction, the reaction solution was filtered to remove the hydrogenation catalyst, and then the phenolic antioxidant pentaerythrityl tetrakis [3- (3,5-di-t-butyl-4-hydroxyphenyl) ) Propionate] ("Songnox 1010" manufactured by Matsubara Sangyo Co., Ltd.) 2.0 parts of xylene solution in which 0.1 part was dissolved was added and dissolved. Next, the above solution is mixed with cyclohexane, xylene and other volatile components as solvents from a solution at a temperature of 260 ° C.
  • the block copolymer contained in the obtained pellets had a weight average molecular weight (Mw) of 65,000, a molecular weight distribution (Mw / Mn) of 1.25, and a hydrogenation rate of almost 100%.
  • Optical film The pellets obtained in the step (1-4) were heated and melted and molded by extrusion to obtain a long original film.
  • the thickness of the raw film was 48 ⁇ m.
  • the raw film was stretched in the width direction by a tenter stretching machine. The stretching temperature was 160 ° C. and the stretching ratio was 1.2 times. By such stretching, an optical film having a thickness of 40 ⁇ m was obtained.
  • Re (590), Rth (590), Re (400) -Re (800), Rth (400) -Rth (800), tensile elastic modulus and tear strength were measured, and the transportability was measured. evaluated.
  • polarizer protective film a film made of a resin containing an alicyclic structure-containing polymer (trade name “Zeonor Film ZF14”, manufactured by Nippon Zeon Co., Ltd., glass transition temperature 136 ° C., thickness 40 ⁇ m) was used.
  • a corona treatment device manufactured by Kasuga Denki Co., Ltd. was used for the corona treatment.
  • the condition of the corona treatment was a discharge amount of 50 W ⁇ min / m 2 .
  • a polarizer a polyvinyl alcohol polarizer (thickness: 23 ⁇ m) was used. Bonding is an arrangement in which the polarizer and the corona-treated surface of the optical film and the polarizer protective film face each other, and these are overlapped through a layer of adhesive (Toyochem Dynaleo CRB series), and a roll laminator is used. This was done by pressure bonding.
  • the resulting multilayer film was irradiated with UV.
  • UV irradiation is performed by using a UV irradiation apparatus (manufactured by Fusion) equipped with a high-pressure mercury light source under the conditions of a peak illuminance of 350 mW / cm 2 and an integrated light quantity of 500 mJ / cm 2 from the light source to the surface on the optical film side. Performed by irradiation.
  • the adhesive was cured to obtain a polarizing plate having a layer structure of (polarizer protective film) / (adhesive layer) / (polarizer) / (adhesive layer) / (optical film).
  • the obtained polarizing plate was evaluated for viewing angle characteristics and curl.
  • Example 2 The optical film and the polarizing plate were obtained and evaluated by the same operation as in Example 1 except for the following changes.
  • step (1-5) the extrusion conditions were changed, and the thickness of the raw film was set to 60 ⁇ m.
  • step (1-5) the draw ratio was changed to 1.5 times.
  • the thickness of the obtained optical film was 40 ⁇ m.
  • Example 3 The optical film and the polarizing plate were obtained and evaluated by the same operation as in Example 1 except for the following changes.
  • step (1-5) the extrusion molding conditions were changed, and the thickness of the raw film was 120 ⁇ m.
  • step (1-5) the draw ratio was changed to 3.0 times.
  • the thickness of the obtained optical film was 40 ⁇ m.
  • Example 4 The optical film and the polarizing plate were obtained and evaluated by the same operation as in Example 1 except for the following changes.
  • the amount of styrene used in step (1-1) was changed to 60 parts
  • the amount of isoprene used in step (1-2) was changed to 20 parts
  • the amount of styrene used in step (1-3) was changed to 20 parts. Changed to the department.
  • the block copolymer contained in the obtained pellet had a weight average molecular weight (Mw) of 65,000, a molecular weight distribution (Mw / Mn) of 1.24, and a hydrogenation rate of almost 100%.
  • Mw weight average molecular weight
  • Mw / Mn molecular weight distribution
  • hydrogenation rate a hydrogenation rate of almost 100%.
  • the extrusion molding conditions were changed, and the thickness of the raw film was set to 100 ⁇ m.
  • the draw ratio was changed to 2.5 times.
  • the thickness of the obtained optical film was 40 ⁇ m.
  • Example 5 The optical film and the polarizing plate were obtained and evaluated by the same operation as in Example 1 except for the following changes. -The amount of styrene used in step (1-1) was changed to 78 parts, the amount of isoprene used in step (1-2) was changed to 12 parts, and the amount of styrene used in step (1-3) was 10 parts. Changed to the department.
  • the block copolymer contained in the obtained pellet had a weight average molecular weight (Mw) of 64,000, a molecular weight distribution (Mw / Mn) of 1.33, and a hydrogenation rate of almost 100%.
  • Mw weight average molecular weight
  • Mw / Mn molecular weight distribution
  • hydrogenation rate hydrogenation rate
  • Step (1-5) The optical film and the polarizing plate were obtained and evaluated by the same operation as in Example 1 except for the following changes.
  • step (1-5) the extrusion molding conditions were changed, and the thickness of the raw film was 40 ⁇ m.
  • Step (1-5) the original film was directly obtained as an optical film without stretching.
  • Example 2 The optical film and the polarizing plate were obtained and evaluated by the same operation as in Example 1 except for the following changes. -The amount of styrene used in step (1-1) was changed to 60 parts, the amount of isoprene used in step (1-2) was changed to 30 parts, and the amount of styrene used in step (1-3) was 10 parts. Changed to the department.
  • the block copolymer contained in the obtained pellet had a weight average molecular weight (Mw) of 65,000, a molecular weight distribution (Mw / Mn) of 1.44, and a hydrogenation rate of almost 100%.
  • Mw weight average molecular weight
  • Mw / Mn molecular weight distribution
  • hydrogenation rate a hydrogenation rate of almost 100%.
  • the extrusion conditions were changed, and the thickness of the raw film was set to 60 ⁇ m.
  • the draw ratio was changed to 1.5 times.
  • the thickness of the obtained optical film was 40 ⁇ m.
  • Example 3 The optical film and the polarizing plate were obtained and evaluated by the same operation as in Example 1 except for the following changes. -The amount of styrene used in step (1-1) was changed to 80 parts, the amount of isoprene used in step (1-2) was changed to 10 parts, and the amount of styrene used in step (1-3) was changed to 10 parts. Changed to the department.
  • the block copolymer contained in the obtained pellet had a weight average molecular weight (Mw) of 64000, a molecular weight distribution (Mw / Mn) of 1.44, and a hydrogenation rate of almost 100%.
  • Mw weight average molecular weight
  • Mw / Mn molecular weight distribution
  • hydrogenation rate a hydrogenation rate of almost 100%.
  • the extrusion conditions were changed, and the thickness of the raw film was set to 60 ⁇ m.
  • the draw ratio was changed to 1.5 times.
  • the thickness of the obtained optical film was 40 ⁇ m.
  • Tables 1 and 2 show the results of Examples and Comparative Examples.
  • St / IP / St The type of polymer constituting the optical film.
  • styrene-isoprene-styrene triblock copolymer the block weight ratio.
  • COP cycloolefin polymer
  • TAC triacetyl cellulose.
  • the optical film and the polarizing plate of the present invention are excellent in curling suppression and trimming properties and can constitute a liquid crystal display device having good viewing angle characteristics.
  • Cut optical film 12 End film 120: Trimming device 121: Upper blade 121C: Rotating shaft 122: Lower blade 122C: Rotating shaft

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  • Physics & Mathematics (AREA)
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  • Engineering & Computer Science (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Manufacturing & Machinery (AREA)
  • Health & Medical Sciences (AREA)
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  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
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  • Mathematical Physics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Polarising Elements (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
  • Graft Or Block Polymers (AREA)

Abstract

La présente invention concerne un film optique qui est formé à partir d'une résine étirée et a Re(590), |Rth(590)|, |Re(400) - Re(800)| et |Rth(400) - Rth(800)| dans des plages spécifiques, tout en ayant un module d'élasticité en traction de 1 500 MPa ou plus et une résistance à la déchirure de 0,6 N/mm ou plus ; une plaque de polarisation qui est pourvue de ce film optique ; et un procédé de production de ce film optique. La résine contient de préférence un polymère qui a une unité d'hydrure de composé vinylique aromatique (a) et une unité d'hydrure de composé diénique (b).
PCT/JP2018/009997 2017-03-31 2018-03-14 Film optique, plaque de polarisation et procédé de production Ceased WO2018180498A1 (fr)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005105140A (ja) * 2003-09-30 2005-04-21 Fuji Photo Film Co Ltd 透明高分子フィルム及びそれを用いた偏光板、液晶表示装置
JP2006195242A (ja) * 2005-01-14 2006-07-27 Fuji Photo Film Co Ltd 光学補償シート、光学補償偏光板、及び液晶表示装置
JP2006293255A (ja) * 2004-05-18 2006-10-26 Fuji Photo Film Co Ltd 光学フィルム、光学補償フィルム、偏光板、液晶表示装置、および自発光型表示装置
JP2006291186A (ja) * 2005-03-14 2006-10-26 Fuji Photo Film Co Ltd セルロースアシレートフィルム及びその製造方法、光学補償フィルム、偏光板および液晶表示装置
JP2011013378A (ja) * 2009-06-30 2011-01-20 Nippon Zeon Co Ltd フィルム
WO2016139927A1 (fr) * 2015-03-02 2016-09-09 株式会社カネカ Composition de résine acrylique, produit moulé et film obtenu à partir de cellei-ci

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI353461B (en) 2004-05-18 2011-12-01 Fujifilm Corp Optical film, optical compensation film, polarizin
EP2276780A1 (fr) 2008-05-07 2011-01-26 Dow Global Technologies Inc. Film de retard optique proche de zéro

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005105140A (ja) * 2003-09-30 2005-04-21 Fuji Photo Film Co Ltd 透明高分子フィルム及びそれを用いた偏光板、液晶表示装置
JP2006293255A (ja) * 2004-05-18 2006-10-26 Fuji Photo Film Co Ltd 光学フィルム、光学補償フィルム、偏光板、液晶表示装置、および自発光型表示装置
JP2006195242A (ja) * 2005-01-14 2006-07-27 Fuji Photo Film Co Ltd 光学補償シート、光学補償偏光板、及び液晶表示装置
JP2006291186A (ja) * 2005-03-14 2006-10-26 Fuji Photo Film Co Ltd セルロースアシレートフィルム及びその製造方法、光学補償フィルム、偏光板および液晶表示装置
JP2011013378A (ja) * 2009-06-30 2011-01-20 Nippon Zeon Co Ltd フィルム
WO2016139927A1 (fr) * 2015-03-02 2016-09-09 株式会社カネカ Composition de résine acrylique, produit moulé et film obtenu à partir de cellei-ci

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