WO2006137427A1 - 偏光板用保護フィルム - Google Patents
偏光板用保護フィルム Download PDFInfo
- Publication number
- WO2006137427A1 WO2006137427A1 PCT/JP2006/312395 JP2006312395W WO2006137427A1 WO 2006137427 A1 WO2006137427 A1 WO 2006137427A1 JP 2006312395 W JP2006312395 W JP 2006312395W WO 2006137427 A1 WO2006137427 A1 WO 2006137427A1
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- WO
- WIPO (PCT)
- Prior art keywords
- polarizing plate
- thermoplastic resin
- refractive index
- resin layer
- protective film
- Prior art date
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
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- 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
- G02F1/133528—Polarisers
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
- G02B1/14—Protective coatings, e.g. hard coatings
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- 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
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2323/00—Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
- C09K2323/03—Viewing layer characterised by chemical composition
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2323/00—Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
- C09K2323/03—Viewing layer characterised by chemical composition
- C09K2323/035—Ester polymer, e.g. polycarbonate, polyacrylate or polyester
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2323/00—Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
- C09K2323/06—Substrate layer characterised by chemical composition
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
- G02B1/11—Anti-reflection coatings
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- 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
- G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
- G02F2201/50—Protective arrangements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24479—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24942—Structurally defined web or sheet [e.g., overall dimension, etc.] including components having same physical characteristic in differing degree
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31507—Of polycarbonate
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
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- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31721—Of polyimide
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
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- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31786—Of polyester [e.g., alkyd, etc.]
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- Y10T428/31855—Of addition polymer from unsaturated monomers
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- Y10T428/3192—Next to vinyl or vinylidene chloride polymer
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y10T428/31909—Next to second addition polymer from unsaturated monomers
- Y10T428/31928—Ester, halide or nitrile of addition polymer
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31855—Of addition polymer from unsaturated monomers
- Y10T428/31938—Polymer of monoethylenically unsaturated hydrocarbon
Definitions
- the present invention relates to a protective film for a polarizing plate, a polarizing plate, and a liquid crystal display device. More specifically, there is no deformation due to peeling or the like even under a high temperature and high humidity environment; light leakage near the edge of the display screen
- the present invention relates to a protective film for a polarizing plate, a polarizing plate, and a liquid crystal display device that are suitable for a liquid crystal display device and the like, which have no visibility defect due to color unevenness, coloring, etc., and have excellent scratch resistance.
- a polarizing plate used in a liquid crystal display device or the like is a laminate comprising a polarizer and a protective film.
- a polarizer constituting this polarizing plate a film obtained by adsorbing iodine or a dichroic dye on a film formed by polybulal alcohol by a solution casting method and stretching in a boric acid solution is usually used. Yes.
- a triacetyl cellulose film is widely used as a protective film constituting the polarizing plate.
- the triacetyl cellulose film has poor moisture resistance and gas barrier properties, the durability, heat resistance, mechanical strength, etc. of the polarizing plate are insufficient.
- Patent Document 1 proposes to use a laminated film composed of a norbornene-based resin layer and a resin layer having a low haze value as a protective film. Then, it is disclosed that a polarizing plate is obtained by attaching this protective film to a polarizer containing polybulal alcohol with the surface of the norbornene-based resin layer facing.
- Patent Document 2 discloses a resin layer having a smaller hygroscopic property than triacetyl cellulose and a positive photoelastic constant, and a resin layer having a smaller hygroscopic property than triacetyl cellulose and a negative photoelastic constant.
- a protective film having a small photoelastic constant, in which layers are laminated, has been proposed.
- a polarizing plate is disclosed in which this protective film is bonded to a polarizer containing polybulal alcohol.
- Patent Document 2 JP 2000-206303 A
- the object of the present invention is to provide excellent scratch resistance and color reproducibility without light leakage, rainbow unevenness, color unevenness, coloring, interference fringes, etc., and peeling even in a high temperature and high humidity environment. It is an object of the present invention to provide a polarizing plate protective film, a polarizing plate, and a liquid crystal display device that are suitable for a liquid crystal display device and the like.
- the present inventor is a film in which k thermoplastic resin layers are laminated (k is an integer of 2 or more), and is the i-th thermoplastic resin.
- a film satisfying a specific relationship with the refractive index n (780) at Onm is stacked on the polarizer.
- thermoplastic resin layer satisfy a specific relationship, and the absolute value of the photoelastic coefficient is 10 X 10— 1
- thermoplastic resin layer is formed of a material having a haze of 0.5% or less and containing an amorphous thermoplastic resin, and in addition, the first thermoplastic resin layer is a polarizer.
- a polarizer obtained by using a protective film satisfying a specific relationship with i + 1 does not peel off the polarizer and the protective film even in a high temperature and high humidity environment.
- the thermoplastic resin layer includes at least one thermoplastic resin layer having a negative photoelastic coefficient and a thermoplastic resin layer having a positive photoelastic coefficient, and is the i-th thermoplastic resin layer.
- Refractive index ⁇ ( ⁇ ) force at a wavelength ⁇ in the range of 380 nm to 780 nm
- refractive index ⁇ ( ⁇ ) at a wavelength ⁇ in the range of 380 nm to 780 nm of the i + th thermoplastic resin layer
- a polarizing plate laminated with a polarizer hardly causes light interference such as rainbow unevenness and coloring.
- the present invention has been completed based on these findings.
- the present invention includes the following.
- thermoplastic resin layers are laminated (k is an integer of 2 or more), and the refractive index n (380) and wavelength 780 ⁇ of the i-th thermoplastic resin layer at a wavelength of 380 nm
- the protective film for polarizing plates which has the relationship of.
- the protective film for a polarizing plate according to (1) which is OX 10 _12 Pa _1 or less.
- thermoplastic resin layer having a negative photoelastic coefficient comprising at least one thermoplastic resin layer having a negative photoelastic coefficient and a thermoplastic resin layer having a positive photoelastic coefficient.
- Protective film comprising at least one thermoplastic resin layer having a negative photoelastic coefficient and a thermoplastic resin layer having a positive photoelastic coefficient.
- thermoplastic resin layer having a negative photoelastic coefficient (4) each comprising at least one thermoplastic resin layer having a negative photoelastic coefficient and a thermoplastic resin layer having a positive photoelastic coefficient;
- thermoplastic resin layers (k is an integer of 2 or more) are laminated, and each of the k thermoplastic resin layers is formed of a material having a haze of 0.5% or less. And contains amorphous thermoplastic resin,
- thermoplastic resin layers are a thermoplastic resin layer having a water absorption of 0.5% or less.
- the protective film for a polarizing plate according to any one of (1) to (7), having a layer.
- the polarizer contains polybulal alcohol
- the protective film for polarizing plate is laminated with the first thermoplastic resin layer facing the polarizer, and the refractive index n (380) of the first thermoplastic resin layer at a wavelength of 380 nm and Refractive index n (780) at a wavelength of 780 nm, and
- the surface of the k-th thermoplastic resin layer of the protective film for polarizing plate has no linear protrusion having a height of 50 ⁇ m or more and a width of 500 nm or less.
- (9) to (12) A polarizing plate according to any one of the above.
- a liquid crystal display device comprising the polarizing plate according to any one of (9) to (13) and a liquid crystal panel.
- the protective film for polarizing plate of the present invention is excellent in color reproducibility in which interference fringes are difficult to occur, and is resistant to friction. Therefore, a polarizing plate that does not cause poor visibility can be obtained by laminating with a polarizer. Furthermore, the protective film for polarizing plate of the present invention is unlikely to change the retardation of the polarizing plate due to heat or stress due to deformation, so even if unpredictable favorable stress is applied, in the vicinity of the edge of the display screen, It is possible to obtain a polarizing plate free from light leakage, uneven color, and coloring.
- the polarizing plate of the present invention has good visibility because it is less likely to cause deformation and scratches due to friction. Further, it is difficult for the polarizer and the protective film to peel off even in a harsh environment. Furthermore, the polarizing plate of the present invention has good visibility because scratches due to friction that hardly interfere with light such as rainbow unevenness and coloring are less likely to occur.
- the polarizing plate of the present invention is particularly suitable for a liquid crystal display device having a large area.
- FIG. 1 is a view showing a refractive index ⁇ ( ⁇ ) of a thermoplastic resin layer used in Examples and Comparative Examples.
- FIG. 2 The absolute value of the difference between the refractive index ⁇ ( ⁇ ) of the polymethylmetatalate resin layer used in this example and the comparative example and the refractive index ⁇ ( ⁇ ) of another thermoplastic resin layer. It is a figure which shows distribution.
- FIG. 3 is a graph showing the distribution of absolute values of the difference between the refractive index ⁇ ( ⁇ ) of polyvinyl alcohol used in the examples and comparative examples and the refractive index ⁇ ( ⁇ ) of the thermoplastic resin layer.
- FIG. 4 is a diagram showing measurement points of the degree of polarization and transmittance performed in this example and a comparative example. Explanation of symbols
- ⁇ polymethylmethacrylate Tari rate ⁇
- COP alicyclic O reflex in the polymer
- TAC tri ⁇ cetyl cellulose
- PC Polycarbonate ⁇
- PET polyethylene terephthalate Ichito ⁇
- R 1 - PMMA Polymethylmetatalylate resin containing elastic particles
- the protective film for polarizing plate of the present invention is formed by stacking k thermoplastic resin layers (k is an integer of 2 or more). That is, the force S is laminated in this order from the first thermoplastic resin layer to the k-th thermoplastic resin layer.
- k is usually 2 to 7, preferably 3 to 5.
- thermoplastic resin constituting the film is, for example, polycarbonate resin, polyether Sulfone resin, polyethylene terephthalate resin, polyimide resin, polymethyl methacrylate resin, polysulfone resin, polyarylate resin, polyethylene resin, polyvinyl chloride resin, diacetyl cellulose, triacetyl cellulose, alicyclic ring It can be selected from the formula olefin polymers.
- the alicyclic olefin polymer is a polymer having an alicyclic structure in the main chain and Z or side chain.
- Specific examples of the alicyclic olefin polymer include cyclic olefin random random copolymers described in JP-A-05-310845, hydrogenation described in JP-A-05-97978.
- Examples thereof include thermoplastic polymers, thermoplastic dicyclopentagen ring-opening polymers described in JP-A-11-124429 (US Pat. No. 6,511,756), and hydrogenated products thereof.
- JP-A-11-124429 US Pat. No. 6,511,756
- hydrogenated products thereof not all of the exemplified thermoplastic resins can be applied to the present invention, but there are some of the same types of thermoplastic resins satisfying the following requirements and satisfying the following requirements. Choose what meets.
- thermoplastic resin used in the present invention is a colorant such as a pigment or dye, a fluorescent brightener, a dispersant, a heat stabilizer, a light stabilizer, an ultraviolet absorber, an antistatic agent, an antioxidant, a lubricant, It may be a combination of compounding agents such as solvents. Of these compounding agents, a lubricant is preferably used.
- Lubricants include inorganic particles such as silicon dioxide, titanium dioxide, magnesium oxide, calcium carbonate, magnesium carbonate, barium sulfate, and strontium sulfate, and polymethyl acrylate, polymethyl methacrylate, polyacrylonitrile, polystyrene And organic particles such as cellulose acetate and cellulose acetate propionate. Among these, organic particles are preferred as the particles constituting the lubricant, and among these, particles made of polymethyl methacrylate are particularly preferred.
- elastic particles having rubbery elastic force can be used.
- the rubber-like elastic body include an acrylate-based rubber-like polymer, a rubber-like polymer containing butadiene as a main component, and an ethylene-vinyl acetate copolymer.
- Acrylic acid ester rubbery polymers include those containing butyl acrylate and 2-ethylhexyl acrylate as the main component. Of these, acrylate polymers based on butyl acrylate and rubbery polymers based on butadiene are preferred.
- There are two types of elastic particles A typical example of the polymer may be a layered structure is a graft elastic rubber elastic component of alkyl acrylate and styrene such as butyl acrylate and polymethyl methacrylate.
- elastic particles having a core-shell structure with a hard resin layer having a copolymer power of Z- and Z- or methyl methacrylate and an alkyl acrylate.
- the elastic particles that can be used in the present invention usually have a number average particle size of 2.0 m or less, preferably 0.1 to 1.0 m, in a state dispersed in a thermoplastic resin. More preferably, it is 0.1 to 0.5 m. Even if the primary particle size of the elastic particles is small, if the number average particle size of secondary particles formed by aggregation or the like is large, the protective film for polarizing plate has a high haze (cloudiness) and a low light transmittance. Therefore, it is not suitable for a display screen. Further, when the number average particle size becomes too small, flexibility tends to decrease.
- the refractive index ⁇ ( ⁇ ) of the elastic particles at a wavelength of 380 nm to 780 nm is
- the relationship of the formula [6] is preferably satisfied between the refractive index ⁇ ( ⁇ ) at a wavelength of 380 nm to 780 nm of the thermoplastic resin used as the matrix.
- the thermoplastic resin used in the present invention preferably has a light transmittance in the visible region of 400 to 700 nm at a thickness of 1 mm of 80% or more, preferably 85% or more, more preferably 90%. The above are more preferable.
- the thermoplastic resin is preferably an amorphous resin from the viewpoint of transparency.
- the glass transition temperature is preferably 60 to 200 ° C, more preferably 100 to 180 ° C. The glass transition temperature can be measured by differential scanning calorimetry (DSC).
- the protective film for polarizing plate of the present invention includes a refractive index n (380) at a wavelength of 380 nm and a refractive index n (780) at a wavelength of 780 nm of the first thermoplastic resin layer, and the i + 1 th Refractive index n (380) and wavelength 780nm at a wavelength of 380nm
- the refractive index n (780) in the formula has the relationship of the formula [1]. II n (380) — n (380)
- n (380) and n (380) are the i-th values at a wavelength of 380 nm.
- n (780) and n (780) are the i-th thermoplastic resin layer at the wavelength 780 nm and the i-th
- thermoplastic resin layer It is the average value of the main refractive index of the + 1st thermoplastic resin layer. Note that the i-th thermoplastic resin layer and the (i + 1) -th thermoplastic resin layer adjacent to each other may be in direct contact with each other or may be in contact with each other through an adhesive layer described later.
- the protective film for polarizing plate of the present invention is 380 ⁇ ! Of the i-th thermoplastic resin layer! ⁇ 7 refractive index ⁇ (e) at wavelength ⁇ in the range of 80 nm, and refractive index ⁇ ( ⁇ ) force at wavelength range of 380 nm to 780 nm of the (i + 1) th thermoplastic resin layer. Relationship
- the absolute value of the photoelastic coefficient is preferably 10 ⁇ 10 _12 Pa _1 or less.
- the phase difference of the polarizing plate changes due to heat or stress due to deformation due to the relationship of the above formula [2] and the photoelastic coefficient being in the above range. Therefore, a polarizing plate free from light leakage, uneven color, coloring, etc. can be obtained near the edge of the display screen even when unpredictable and undesirable stress is applied.
- the photoelastic coefficient is a value indicating the stress dependence of birefringence generated when stress is applied, and the refractive index difference ⁇ is obtained by the product of the stress ⁇ and the photoelastic coefficient C. Have.
- This photoelastic coefficient can be measured using a photoelastic constant measuring device under conditions of a temperature of 20 ° C ⁇ 2 ° C and a humidity of 60 ⁇ 5%.
- the absolute value of the photoelastic coefficient is more preferably 7X 10 _12 Pa _1 or less, particularly preferably 5X 10 _12 Pa _1 below.
- thermoplastic resin layer having a negative photoelastic coefficient is preferred.
- thermoplastic resin layer having a negative photoelastic coefficient is a resin layer in which ⁇ becomes negative when subjected to a positive stress ⁇ .
- a thermoplastic resin layer having a positive photoelastic coefficient is a resin layer having a positive ⁇ when subjected to a positive stress ⁇ .
- the thermoplastic resin constituting each thermoplastic resin layer is not particularly limited as long as it can form a layer having the above coefficient, and may be one type of resin or a combination of two or more types. May be.
- the combination of two or more types includes a thermoplastic resin having a negative photoelastic coefficient and a thermoplastic resin having a positive photoelastic coefficient, which are just combinations of thermoplastic resins having the same sign of photoelastic coefficient. It can be a combination of! /.
- thermoplastic resin having a negative photoelastic coefficient examples include polymethylmetatalylate resin, polystyrene, poly- ⁇ -methylstyrene, and a calocopolymer with ethylene-tetracyclododecene. .
- thermoplastic resins having a positive photoelastic coefficient examples include polycarbonate resins, polysulfone resins, polyarylate resins, polyethersulfone resins, polyethylene terephthalate resins, tetracyclododecene and dicyclopentagen. And ring-opening polymers of norbornene structure-containing monomers such as hydrides thereof, triacetyl cellulose and the like.
- each of the k thermoplastic resin layers is formed of a material having a haze of 0.5% or less, and contains amorphous thermoplastic resin. It is preferable that the humidity expansion coefficient ⁇ of the first thermoplastic resin layer and the humidity expansion coefficient ⁇ of the (i + 1) th thermoplastic resin layer satisfy the relationship of equation [3].
- thermoplastic resin has no haze.
- each of the k thermoplastic resin layers is formed of a material having a haze of 0.1% or less.
- Haze ⁇ O IS Japanese Industrial Standard, the same shall apply hereinafter
- K7105 five flat plates with a thickness of 2 mm produced by a normal injection molding method (using a molding die with no irregularities on the surface) Measured using a turbidimeter, for example, “Durbidity Meter NDH-300A” manufactured by Nippon Denshoku Industries Co., Ltd., and its arithmetic average value is taken as the haze value.
- the amorphous thermoplastic resin is a thermoplastic resin having no melting point, and can be selected from the thermoplastic resins.
- the content of the amorphous thermoplastic resin is preferably 60 to: LOO% by weight in the thermoplastic resin layer. Note that the above equation [3] is expressed as I j8 — j8 I ⁇
- the water absorption of at least one of the k thermoplastic resin layers is preferably 0.5% or less, particularly preferably 0.1% or less. If a film having a low water absorption is used for the protective film for polarizing plate, the durability of the polarizing plate is increased.
- the water absorption rate of the thermoplastic resin layer can be determined according to JIS K7209.
- the protective film for polarizing plate of the present invention has a moisture permeability of preferably 1 to 200 gZ (m 2 -2
- the moisture permeability can be measured at a temperature of 40 ° C and a humidity of 90% using the cup method according to JIS Z0208.
- a preferred protective film for a polarizing plate of the present invention comprises at least one thermoplastic resin layer (hereinafter, referred to as "between the k-th thermoplastic resin layer and the first thermoplastic resin layer”). And “intermediate layer”).
- the intermediate layer may be made of a different type of thermoplastic resin than the thermoplastic resin forming the kth thermoplastic resin layer and the first thermoplastic resin layer, or the same type. It may be composed of thermoplastic resin.
- thermoplastic resin layer is formed to prevent warping, bending, rounding, etc. of the polarizing plate.
- the same type of heat is used for the oil and the thermoplastic resin that forms the first thermoplastic resin layer. It is preferred to choose from plastic rosin.
- the thermoplastic resin forming the kth thermoplastic resin layer is preferably hard! Specifically, a pencil hardness (according to JIS K5600-5-4, except that the test load is 500 g), which is harder than 2H is preferable.
- the thermoplastic resin forming the k-th thermoplastic resin layer the most preferable one is selected from acrylic resins such as polymethylmethalate resin.
- the laminated thermoplastic resin layers may be in direct contact with each other, or may be in contact with each other through an adhesive layer.
- the adhesive layer is a layer that has a material strength with a tensile fracture strength of 40 MPa or less according to JIS K7113.
- the average thickness of the adhesive layer is usually from 0.01 to 30 / ⁇ ⁇ , preferably from 0.1 to 15 m.
- Adhesives constituting the adhesive layer include acrylic adhesives, urethane adhesives, polyester adhesives, polybutyl alcohol adhesives, polyolefin adhesives, modified polyolefin adhesives, polyalkyl alkyl ethers.
- Adhesives Rubber adhesives, Salt-Buhl-Monoacetate Bulle adhesives, SEBS Adhesives, Ethylene-based adhesives such as Ethylene-styrene copolymer, Ethylene methyl acrylate copolymer, Ethylene acrylate acrylate Examples thereof include acrylic acid ester adhesives such as polymers, and methacrylic acid ester adhesives such as ethylene-methyl methacrylate copolymers and ethylene-ethyl methacrylate copolymers.
- the thermoplastic resin layer forming the protective film for polarizing plate of the present invention is not particularly limited by the thickness, but the average thickness of the k-th thermoplastic resin layer is usually 5 m to 100 ⁇ m. m, preferably 10 ⁇ m to 50 ⁇ m.
- the average thickness of the first thermoplastic resin layer is usually 5 ⁇ m to 100 ⁇ m, preferably 10 ⁇ m to 50 ⁇ m.
- the average thickness of the intermediate layer provided as necessary is usually 5 ⁇ m to 100 ⁇ m, preferably 10 ⁇ m to 50 ⁇ m.
- the average thickness of the entire protective film for polarizing plate is usually 20 ⁇ m to 200 ⁇ m, preferably 40 ⁇ m to 100 ⁇ m.
- the average thickness of the kth thermoplastic resin layer and the average thickness of the first thermoplastic resin layer are substantially equal.
- the absolute value of the difference between the average thickness of the kth thermoplastic resin layer and the average thickness of the first thermoplastic resin layer is preferably 20 ⁇ m or less, more preferably 10 ⁇ m. It is as follows.
- the ratio of the average thickness of the intermediate layer to the average thickness of the k-th thermoplastic resin layer or the average thickness of the first thermoplastic resin layer is not particularly limited but is preferably 5: 1 to 1: Five.
- the refractive index of the axis n is the refractive index in the direction perpendicular to the slow axis in the plane, n is the refractive index in the film thickness direction, and d is the average thickness of the polarizing plate protective film).
- the thickness direction letter Rth of the protective film for polarizing plate is ⁇ 10 nm to + Onm at a wavelength of 550 nm ⁇ 5 ⁇ ! ⁇ + 5nm more preferred! / ,.
- the protective film for polarizing plate of the present invention is not particularly limited by its production method.
- the protective film obtained by laminating a single-layer thermoplastic resin film, two or more thermoplastic resins can be used.
- Examples obtained by coextrusion molding and those obtained by casting a thermoplastic resin solution on a thermoplastic resin film include those obtained by coextrusion molding from the viewpoint of productivity. preferable.
- the protective film for polarizing plate of the present invention preferably further has an antireflection layer directly or indirectly on the surface of the kth thermoplastic resin layer.
- the average thickness of the antireflection layer is preferably from ⁇ to 0.01 to 1 ⁇ m, more preferably from ⁇ to 0.02 to 0.5 ⁇ m. You can choose from anti-reflective layer or well-known one.
- a refractive index smaller than that of the k-th thermoplastic resin layer preferably a refractive index of 1.30 to: a low refractive index layer of L 45, a low refractive index layer made of an inorganic compound and an inorganic compound
- refractive index layer of L 45 examples include those obtained by repeatedly laminating a high refractive index layer made of a compound, and those obtained by laminating a low refractive index layer formed of a material having a micro air layer on a high refractive index layer having high surface hardness.
- stacked the low-refractive-index layer formed with the material which has a micro air layer on a refractive index layer is preferable.
- An antireflection layer in which a low refractive index layer formed of a material having a micro air layer on a high refractive index layer having a high surface hardness is described.
- the low refractive index layer preferably used in the present invention is formed of a material having a minute air layer.
- the thickness of the low refractive index layer is usually 10 to: LOOOnm, preferably 30 to 500nm.
- An air mouth gel is mentioned as a material which has a micro air layer.
- the air mouth gel is a transparent porous body in which minute bubbles are dispersed in a matrix.
- the bubble size is mostly 200 nm or less, and the bubble content is usually 10 to 60% by volume, preferably 20 to 40% by volume.
- the air mouth gel includes a silica air mouth gel and a porous material in which hollow fine particles are dispersed in a matrix.
- Silica air lip gels are disclosed in US Pat. No. 4,402,927, US Pat. No. 4,432,956, US Pat. No. 4,610,863, etc.
- the gel-like compound having a silica skeleton obtained by the hydrolytic polymerization reaction of xysilane is wetted with a solvent (dispersion medium) such as alcohol or diacid-carbon, and the solvent is removed by supercritical drying.
- a solvent such as alcohol or diacid-carbon
- Silica air mouth gel is produced in the same manner as described above using sodium silicate as a raw material as disclosed in US Pat. No. 5,137,279, US Pat. No. 5,124,364, etc. be able to.
- JP-A-5-279011 and JP-A-7-138375 are identical to JP-A-5-279011 and JP-A-7-138375.
- a porous material in which hollow fine particles are dispersed in a matrix is disclosed in JP-A-2001-233611. And a porous material as disclosed in JP-A-2003-149642.
- the porous body in which the hollow fine particles are dispersed in the matrix is not included in the thermoplastic resin layer.
- the material used for the matrix is selected so as to meet the conditions such as the dispersibility of the hollow fine particles, the transparency of the porous body, and the strength of the porous body.
- hydrolyzable organosilicon compounds such as silane and hydrolysates thereof.
- dispersibility of hollow fine particles, strength of porous material, acrylic resin, epoxy resin, urethane resin, silicone resin, hydrolyzable organic silicon compound and hydrolyzate thereof are preferable.
- the hollow fine particles are not particularly limited, but inorganic hollow fine particles are preferred, and silica-based hollow fine particles are particularly preferred.
- examples of inorganic compounds constituting the inorganic hollow fine particles include SiO and Al 2 O 3
- the outer shell of the hollow fine particle may be a porous one having pores or may be one in which the pores are closed and the cavity is sealed against the outside of the outer shell.
- the outer shell preferably has a multi-layered structure with inner and outer layers, which also has power.
- a fluorine-containing organosilicon compound is used to form the outer layer, the refractive index of the hollow fine particles is lowered, the dispersibility in Matritus is improved, and the antifouling property is imparted to the low refractive index layer. Arise.
- fluorine-containing organosilicon compound examples include 3,3,3-trifluoropropyltrimethoxysilane, methyl 3,3,3-trifluoropropyldimethoxysilane, heptadecafluoro-decylmethyldimethoxysilane, heptadecaflurane.
- examples include olodecyltrichlorosilane, heptadecafluorodecyltrimethoxysilane, and tridecafluorooctyltrimethoxysilane.
- the thickness of the outer shell is usually 1 to 50 nm, preferably 5 to 20 nm.
- the thickness of the outer shell is preferably in the range of 1Z50 to 1Z5, which is the average particle diameter of the inorganic hollow fine particles.
- the cavity may contain the solvent used when preparing the hollow microparticles and Z or a gas that penetrates during drying, and the precursor material for forming the cavity remains in the cavity. It may be.
- the average particle size of the hollow fine particles is not particularly limited, but is preferably in the range of 5 to 2, OOOnm, more preferably 20 to: LOOnm.
- the average particle diameter is a number average particle diameter by observation with a transmission electron microscope.
- the protective film for polarizing plate on which the antireflection layer is laminated has an incident angle of 5 °.
- the reflectance power at 430 to 700 nm is preferably 2.0% or less, and the reflectance at 550 nm is preferably 1.0% or less.
- the high refractive index layer having a high surface hardness can be used as the kth thermoplastic resin layer, and the surface of the kth thermoplastic resin layer can be used.
- the thermoplastic resin layer may be provided as a layer different from the thermoplastic resin layer (the layer provided separately may be referred to as “no coat layer”).
- the thickness of the high refractive index layer is preferably 0.5 to 30 m, more preferably 3 to 15 m.
- the refractive index of the high refractive index layer is preferably 1.6 or more.
- the high-refractive index layer (node coat layer) has a test load of 500 g. IS K5600-5
- hard coat layer materials organic hard coat materials such as organic silicone, melamine, epoxy, acrylic, and urethane acrylate, and inorganic hard coat materials such as silicon dioxide; Etc. Of these, urethane acrylate and polyfunctional acrylate hard coat materials are preferably used from the viewpoint of good adhesive strength and excellent productivity.
- the high refractive index layer has a refractive index n force and a refractive index n of the low refractive index layer laminated thereon.
- the high refractive index layer As desired, various adjustments may be made for the purpose of adjusting the refractive index, improving the flexural modulus, stabilizing the volume shrinkage, improving heat resistance, antistatic properties, antiglare properties, etc.
- a filler may be included.
- various additives such as an antioxidant, an ultraviolet absorber, a light stabilizer, an antistatic agent, a leveling agent, and an antifoaming agent can be blended.
- Examples of the filter for adjusting the refractive index and antistatic property of the high refractive index layer include acid titanium, acid zirconium, zinc oxide, tin oxide, acid cerium, and pentaacid.
- Antimony pentoxide, ITO, IZO, ATO, and FTO are preferred because they can maintain transparency.
- the primary particle size of these fillers is usually from 1 nm to 10 nm, preferably from 1 nm to 30 nm.
- filler for imparting anti-glare properties those having an average particle size of 0.5 to 10 ⁇ m are preferred 1 to 7 / ⁇ ⁇ are more preferred 1 to 4 / More preferably, ⁇ ⁇ .
- Specific examples of fillers that impart antiglare properties include polymethylmethallate resin, vinylidene fluoride resin and other fluorine resins, silicone resins, epoxy resins, nylon resins, polystyrene resins.
- Phenol resin polyurethane resin, cross-linked acrylic resin, cross-linked polystyrene resin, melamine resin, benzoguanamine resin and other organic resin fillers; or acid titanium, acid aluminum, indium oxide
- fillers include inorganic compounds such as zinc oxide, antimony oxide, tin oxide, acid silicate, iTO, magnesium fluoride, and oxygen.
- an anti-glare means may be provided on the surface thereof.
- the protective film for polarizing plate of the present invention after forming the anti-glare means preferably has a haze of 5 to 60. %, More preferably 10 to 50%.
- the haze can be measured according to JIS K7105 using a commercially available turbidimeter such as an NDH-300mm haze meter manufactured by Nippon Denshoku Industries Co., Ltd.
- the transmitted image definition of the protective film for polarizing plate of the present invention after the anti-glare means is formed is about 50 to 100%, preferably 60 to about LOO%. is there.
- the transmitted image definition is in the above range, the transmitted light is less blurred, so that even in a high-definition display device, it is possible to prevent the outline of the pixel from being blurred, and as a result, character blur can be prevented.
- the transmission image definition is a scale for quantifying blurring and distortion of light transmitted through a film.
- the transmitted image sharpness is measured through an optical comb that moves the transmitted light of the film force.
- the value is calculated from the amount of light in the bright and dark areas. In other words, when the film blurs the transmitted light, the slit image formed on the optical comb becomes thick, so the amount of light at the transmissive part is 100% or less, while the light leaks at the non-transmissive part. % Or more.
- the transmitted image clarity value C is defined by the following equation from the maximum transmitted light value M of the transparent part of the optical comb and the minimum transmitted light value m of the opaque part.
- the measuring device for measuring the transmitted image definition a commercially available image clarity measuring device, for example, image clarity measuring device ICM-1 manufactured by Suga Test Instruments Co., Ltd. can be used.
- image clarity measuring device ICM-1 manufactured by Suga Test Instruments Co., Ltd.
- optical comb an optical comb having a width of 0.125 to 2 mm can be used.
- both the transmitted image definition and the haze after formation of the anti-glare means are in the above ranges.
- the method for forming the anti-glare means is not particularly limited, and an appropriate anti-glare means can be adopted.
- Examples thereof include a method for imparting fine irregularities to the protective film for polarizing plates and a method for imparting an antiglare function by internal scattering by forming a film layer including a region having a discontinuous refractive index.
- the method for providing fine irregularities is not particularly limited, and an appropriate method can be adopted.
- a method of roughening the surface by a method such as sandblasting, embossing roll, chemical etching, etc.
- a method of dispersing inorganic and Z or organic fine particles in the resin constituting the protective film for polarizing plate, and a transparent containing inorganic and Z or organic fine particles on the protective film for polarizing plate examples thereof include a method of forming an antiglare layer having a resin material strength, and two or more of the above methods may be used in combination.
- Two or more kinds of the fine particles may be used.
- fine particles that exhibit a diffusion effect due to a difference in refractive index with the transparent resin material and fine particles that exhibit a diffusion effect by forming irregularities on the surface of the resin layer can be used in combination.
- the fine particles in the resin or transparent resin material constituting the protective film for polarizing plate may exist in a uniformly dispersed form or may be unevenly distributed in the film thickness direction.
- the fine particles may exist in a form in which the surface force protrudes, but from the viewpoint of improving the clarity of the transmitted image, the fine particles protrude from the surface of the antiglare layer to 0.5 m or less. I like it.
- compositions having different refractive indexes are used, for example, by ultraviolet irradiation.
- examples thereof include a method of forming a film layer having a phase separation structure and a method of forming a film layer containing fine particles having a refractive index different from that of the transparent resin material and the transparent resin material.
- the antifouling layer is a layer that can impart water repellency, oil repellency, sweat resistance, antifouling properties, etc. to the surface of the protective film for polarizing plate.
- a fluorine-containing organic compound is suitable. Examples of the fluorine-containing organic compound include fluorocarbon, perfluorosilane, or a polymer compound thereof.
- the average thickness of the antifouling layer is preferably 1 to 50 nm, more preferably 3 to 35 nm.
- the protective film for polarizing plate of the present invention may be provided with other layers such as a gas nolia layer, a transparent antistatic layer, a primer layer, an electromagnetic shielding layer, and an undercoat layer.
- the polarizing plate of the present invention can be formed by laminating the polarizing plate protective film of the present invention with a polarizer.
- the protective film for polarizing plate of the present invention can be laminated on the other surface of the polarizer, and a conventional protective film is laminated.
- the conventional protective film is not particularly limited by its moisture permeability, but is preferably 0.3 to 40 gZ (m 2 '24hr), more preferably 0.6 to 20 gZ (m 2 ' 24hr), and particularly preferably. 1. 0 ⁇ 10g / - are those of (m 2 24hr).
- the moisture permeability can be measured at a temperature of 40 ° C and a humidity of 90% using the cup method according to JIS Z0208.
- the polarizer used in the present invention is a known polarizer used in a liquid crystal display device or the like!
- a film obtained by adsorbing iodine or a dichroic dye on a polyvinyl alcohol film and then uniaxially stretching in a hydrofluoric acid bath or a film obtained by adsorbing iodine or a dichroic dye on a polybulu alcohol film.
- polybularco in the molecular chain and those obtained by modifying a part of the polyol unit to a polyvinylene unit.
- Other examples include a polarizer having a function of separating polarized light into reflected light and transmitted light, such as a grid polarizer, a multilayer polarizer, and a cholesteric liquid crystal polarizer. Of these, polarizers containing polybutyl alcohol are preferred.
- the degree of polarization of the polarizer used in the present invention is not particularly limited, but is preferably 98% or more, and more preferably 99% or more.
- the average thickness of the polarizer is preferably 5 to 80 ⁇ m.
- the protective film for polarizing plate is laminated with the first thermoplastic resin layer facing the polarizer side, and the first thermoplastic resin layer
- the difference between the refractive index of the first thermoplastic resin layer at the wavelength near the upper limit of the visible light region and the refractive index of polyvinyl alcohol contained in the polarizer is the difference in the wavelength near the lower limit, That is not so different.
- n (380) and n (380) are the average values of the principal refractive indices at the respective wavelengths.
- n (780) is the refractive index of non-oriented polyvinyl alcohol.
- thermoplastic resin forming the first thermoplastic resin layer is preferably selected from acrylic resin, cycloaliphatic olefin polymer, and polycarbonate resin, especially, such as methylmethacrylate resin. Those selected from acrylic resin are preferred.
- the polarizer contains polyvinyl alcohol
- the first thermoplastic resin layer of the protective film for polarizing plate is 380 ⁇ !
- n ( ⁇ ) is the average value of the main refractive index at the wavelength ⁇ .
- ⁇ ( ⁇ ) is a non-oriented poly
- the protective film for polarizing plate has a linear recess having a depth of 50 nm or more and a width of 500 nm or less on the surface of the k-th thermoplastic resin layer. Preferably, it does not have a linear recess having a depth of 30 nm or more and a width of 700 nm or less.
- the protective film constituting the preferred polarizing plate of the present invention does not have a linear protrusion having a height of 50 nm or more and a width of 500 nm or less on the surface of the k-th thermoplastic resin layer, preferably a high film.
- linear protrusions with a width of 30 nm or more and a width of 700 nm or less.
- a linear convex portion having a height of 50 nm or more and a width of 500 nm or less as described above or a linear concave portion having a depth of 50 nm or more and a width of 500 nm or less is formed on the surface of the first thermoplastic resin layer. It is preferable not to have By not having such a linear recess or linear protrusion, light leakage, light interference, etc. can be prevented.
- the surface does not have a linear recess having a depth of 50 nm or more and a width of 500 nm or less means that the surface is flat, or even if there is a linear recess, the depth is less than 50 nm, or the width force. Say that it is over OOnm.
- the fact that the surface does not have a linear convex part with a height of 50 nm or more and a width of 500 nm or less means that the surface is flat, or even if there is a linear convex part, the height is less than 50 nm, or Says that the width is over 500nm.
- the depth of the linear concave portion, the height of the linear convex portion, and the width thereof are determined by the following method.
- the film is irradiated with light, the transmitted light is projected onto the screen, and the portion of the light that appears on the screen has bright or dark stripes (this portion has a large depth of the linear recess and a height of the linear projection) Cut out a 30mm square.
- the surface of the cut film piece is observed using a three-dimensional surface structure analysis microscope (field region 5 mm X 7 mm), converted into a three-dimensional image, and a cross-sectional profile in the MD direction is obtained from this three-dimensional image.
- the cross-sectional profile is obtained at lmm intervals in the field of view.
- An average line is drawn on this cross-sectional profile, and the length from the average line to the bottom of the linear concave portion is the depth of the linear concave portion, or the average linear force
- the length to the top of the linear convex portion is the height of the linear convex portion. It becomes.
- the distance between the intersection of the average line and the profile is the width.
- thermoplastic resin layer having no linear convex part and linear concave part having such a size can be obtained by the following means.
- the surface roughness of the lip portion of the die is reduced, the tip of the lip is coated with chromium, nickel, titanium, etc., ceramic is sprayed on the lip tip, The temperature distribution around the melted resin immediately after being extruded from the die, forming a film such as TiN, TiAlN, TiC, CrN, DLC (diamond-like carbon) by PVD (Phisical Vapor Deposition) method on the inner surface, It can be obtained by performing means such as uniformly adjusting the air flow or selecting a resin having the same melt flow rate value as the resin forming the thermoplastic resin layer.
- a cast support film with a small surface roughness is used, the surface roughness of the coating machine is reduced, and the temperature distribution, drying temperature, and drying time of the coating layer are adjusted.
- the polarizer and the polarizing plate protective film may be in direct contact with each other or may be in contact with each other via an adhesive layer.
- Adhesives constituting this adhesive layer include talyl-based adhesives, urethane-based adhesives, polyester-based adhesives, polybutyl alcohol-based adhesives, polyolefin-based adhesives, modified polyolefin-based adhesives, polyalkylene alkyls. For example, one-tel adhesive, rubber adhesive, and salt vinyl chloride acule adhesive.
- the liquid crystal display device of the present invention comprises at least the polarizing plate of the present invention and a liquid crystal panel.
- the liquid crystal panel is not particularly limited as long as it is used in a liquid crystal display device.
- TN Transmission Nematic
- STN Super Twisted Nematic
- HAN Hybrid Alignment Nematic
- IPS In Plane Switching
- VA Vertical Alignment
- MVA Multiple Vertical Alignment type liquid crystal panel
- OCB Optical Compensated Bend
- a preferable liquid crystal display device of the present invention is one in which the polarizing plate is provided on the viewing side of the liquid crystal panel.
- a liquid crystal display device is usually provided with two polarizing plates sandwiching a liquid crystal panel.
- the viewing side of the liquid crystal panel is the side on which the viewer can see the display screen. Since the polarizing plate of the present invention, in particular the polarizing plate obtained by laminating the polarizing plate protective film on the viewing side, has excellent visibility, it is preferably disposed on the viewing side of the liquid crystal panel.
- thermoplastic resin layer has four or more layers. It also includes the case of 2 layers. Parts and% are based on weight unless otherwise specified.
- a high refractive index layer-forming composition H was prepared by mixing at a ratio of 50% by weight of the solid content.
- Silicone having a weight average molecular weight of 850, 21 parts of tetramethoxysilane, 36 parts of methanol, 2 parts of water, and 2 parts of 0.1N aqueous hydrochloric acid were mixed and stirred in a high-temperature bath at 25 ° C for 2 hours.
- a resin was obtained.
- hollow silica fine particles Z-silicone resin (condensation compound equivalent) is prepared by carving hollow silica fine particle isopropanol dispersion sol (solid content 20%, average primary particle diameter approx. 35 nm, outer shell thickness approx. 8 nm) on the silicone resin. ) was 8: 2 by weight ratio based on solid content.
- the composition L for forming a low refractive index layer was prepared by diluting with methanol so that the total solid content was 1%.
- Thickness with a refractive index of 1.545 at a wavelength of 380 nm and a refractive index of 1.521 at a wavelength of 780 nm A 75 / zm polybulal alcohol (PVA) film was uniaxially stretched 2.5 times, immersed in an aqueous solution at 30 ° C containing 0.2 gZL of iodine and 60 gZL of potassium iodide for 240 seconds. It was immersed in an aqueous solution containing 70 g ZL of acid and 30 g ZL of potassium oxalate and simultaneously uniaxially stretched 6.0 times and held for 5 minutes. Finally, it was dried at room temperature for 24 hours to obtain a polarizer P having an average thickness of 30 / zm and a polarization degree of 99.95%.
- Polymethylmetatalate rosin (water absorption 0.3%, photoelastic coefficient is 6.0 X Haze 0.08%, Humidity expansion coefficient 28ppmZ% RH, Tensile modulus 3.3 GPa, abbreviated as “PMMA”. ) was introduced into a double flight type single screw extruder equipped with a polymer filter in the shape of a leaf disk with a mesh size of 10 ⁇ m. Supplied to one of the multi-hold dies, which is 0.1 m.
- cycloaliphatic olefin polymers (norbornene-based ring-opening polymer hydrogenated carotenates, water absorption of less than 0.01%, photoelastic coefficient 6.3 X Haze 0.02%, humidity expansion coefficient l PP Less than mZ% RH, tensile modulus 2.4 GPa, abbreviated as “COP”. ) was introduced into a double flight type single screw extruder equipped with a leaf disk-shaped polymer filter with a mesh opening of 10 / zm. Supplied to the other of the multi-hold die which is 0.1 ⁇ m.
- each of melted polymethylmetatalyl resin, alicyclic olefin polymer, and ethylene acetate butyl copolymer as an adhesive was discharged from a multi-hold die at 260 ° C, and 130 Cast into a chill roll adjusted to 50 ° C and then passed through a chill roll adjusted to 50 ° C to polymethylmetatalylate resin layer (20 m) —adhesive layer (4 m) alicyclic ring Protective film 1A for polarizing plate with a width of 600 mm and a thickness of 80 ⁇ m consisting of a three-layer structure consisting of an epoxy resin layer (32 m), an adhesive layer (4 m), and a polymethylmethacrylate resin layer (20 ⁇ m).
- the protective film for polarizing plate 1A has a moisture permeability of 3.5 g / (m 2 '24h), a photoelastic coefficient of l X 10 _12 Pa _ 1 , and a humidity expansion coefficient difference between adjacent layers of 27 ppmZ% RH, its surface was a flat surface with no linear concave portions or linear convex portions.
- the refractive index ⁇ ( ⁇ ) has the distribution shown in Fig. 1.
- the alicyclic polyolefin polymer layer had a refractive index ⁇ ( ⁇ ) having the distribution shown in FIG.
- Both sides of the polymethylmetatalylate resin layer have a refractive index of 1.512 at a wavelength of 380 nm and a refractive index of 1.488 at a wavelength of 780 nm, and the alicyclic olefin polymer layer has a refractive index of 380 ⁇ m.
- the refractive index was 1.555 and the refractive power of 529 at a wavelength of 780 nm.
- the value of the formula [1] was 0.002.
- Fig. 2 shows the distribution of absolute values of the difference between the refractive index ⁇ ( ⁇ ) of the polymethylmethacrylate resin layer and the refractive index ⁇ ( ⁇ ) of the alicyclic polyolefin polymer layer.
- the polymethyl metatalylate resin layer and the alicyclic olefin polymer layer satisfied the relationship of the formula [2].
- Fig. 3 shows the distribution of absolute values of the difference between the refractive index ⁇ ( ⁇ ) of polybulal alcohol contained in the polarizer and the refractive index ⁇ ( ⁇ ) of the polymethylmetatalylate resin layer. .
- the polyvinyl alcohol and polymethylmethacrylate resin layer contained in the polarizer had a value of Formula [4] of 0 and satisfied the relationship of Formula [5].
- the obtained polarizing plate is attached to the liquid crystal display device so that the film 1 is on the side of the liquid crystal panel.
- One side of a 80 / zm thick triacetylcellulose film was coated with 25 mL Zm 2 of a 1.5 molar ZL isopropyl alcohol solution of potassium hydroxide and dried at 25 ° C. for 5 seconds. Next, the film was washed with running water for 10 seconds, and finally, the surface of the film was dried by blowing air at 25 ° C. to obtain a film 2B in which only one surface of the triacetyl cellulose film was saponified.
- Laminate 1A, polarizer P, and film 2B were stacked and bonded with the adhesive by a roll-to-roll method to obtain polarizing plate 2.
- the evaluation results are shown in Tables 1 and 2.
- the obtained polarizing plate is attached to the liquid crystal display device with the film 1 A facing away from the liquid crystal panel.
- Both surfaces of this surface-treated triacetyl cellulose film had a water absorption of 0.3% and a photoelastic coefficient of 6.0 X
- Protective film for polarizing plate by laminating a single layer film of polymethylmetatalylate resin having a haze of 0.08%, humidity expansion coefficient of 28ppmZ% RH, tensile modulus of 3.3 GPa, and a thickness of 30 m. 2A was obtained.
- the protective film 2A for polarizing plate has a moisture permeability of 61 g, (m 2 '24h), a photoelastic coefficient of 3 X 10 _12 Pa _1 , and a difference in humidity expansion coefficient between adjacent layers of 37 ppm Z% RH.
- the triacetyl cellulose layer has a refractive index n (e) having the distribution shown in FIG. 1, and the polymethylmetatalate resin layer has a refractive index ⁇ ( ⁇ ) having the distribution shown in FIG. / Both sides of the methyl methacrylate resin layer had a refractive index of 1.512 at a wavelength of 380 nm and a refractive index of 1.488 at a wavelength of 780 nm.
- the value of the formula [1] was 0.002.
- FIG. 2 shows the distribution of absolute values of the difference between the refractive index ⁇ ( ⁇ ) of the polymethylmethacrylate resin layer and the refractive index ⁇ ( ⁇ ) of the triacetylcellulose layer.
- the polymethyl metatalylate resin layer and the triacetyl cellulose layer satisfied the relationship of the formula [2].
- Fig. 3 shows the refractive index ⁇ ( ⁇ ) of the polybutyl alcohol contained in the polarizer and the refractive index ⁇ of the polymethylmetatalylate resin layer.
- the distribution of the absolute value of the difference from ( ⁇ ) is shown.
- the polybutyl alcohol and polymethyl methacrylate resin layer contained in the polarizer had a value of formula [4] of 0 and satisfied the relation of formula [5].
- the evaluation results are shown in Tables 1 and 2.
- the obtained polarizing plate is attached to the liquid crystal display device so that the film 2 ⁇ is on the side far from the liquid crystal panel force.
- a corona discharge treatment was performed on both sides of the polarizing plate protective film 1 using a high frequency transmitter, and a polarizing plate protective film 1C having a surface tension of 0.055 NZm was obtained.
- the composition H for forming a high refractive index layer is applied to one side of the polarizing plate protective film 1A using a die coater, and dried in an oven at 80 ° C. for 5 minutes to obtain a film. It was. Furthermore, ultraviolet rays were applied (accumulated dose 300 mjZcm 2 ) to form a high refractive index layer having a thickness of 5 ⁇ m, and a laminated film 1D was obtained.
- the refractive index of the high refractive index layer was 1.62, and the pencil hardness was 4H.
- the low refractive index layer-forming composition L is applied using a wire bar coater, left to stand for 1 hour and dried, and the resulting coating is 120 ° C.
- Heat treatment was performed in an oxygen atmosphere for 0 minutes to form a low refractive index layer (refractive index 1.36) having a thickness of lOOnm, and a polarizing plate protective film 1E with an antireflection layer was obtained.
- Acrylic adhesive is applied to both sides of the polarizer P, and the antireflection layer of the polarizing plate protective film 1E is formed.
- the surface and the corona discharge treatment surface of the film 1B are overlapped with the polarizer P,
- a laminated polarizing plate 4 was obtained by a roll-to-roll method.
- the evaluation results are shown in Tables 1 and 2.
- the obtained polarizing plate is attached to the liquid crystal display device so that the film 1E (antireflection layer) is on the side far from the liquid crystal panel force.
- Polymethylmetatalate rosin (water absorption 0.3%, photoelastic coefficient is 6.0 X Double flight type uniaxial extrusion with a leaf disk-shaped polymer filter with a mesh size of 10 ⁇ m and a 0.08% haze, a coefficient of humidity expansion of 28 ppmZ% RH, a tensile modulus of 3.3 GPa and abbreviated as “PMMA”)
- PMMA tensile modulus
- polymethylmetatalylate resin tensile
- elastic modulus 2.8 GPa Elastic modulus 2.8 GPa
- an ultraviolet absorber LA31; manufactured by Asahi Denka Kogyo Co., Ltd.
- Coefficient 4.0 X 10 — 12 Pa — 1 haze 0.1%
- humidity expansion coefficient 30 ppmZ% RH abbreviated as “1 ⁇ —PMMA”.
- polymethylmetatalate resin not containing molten elastic particles, and polymethylmetatalate resin containing ultraviolet absorbers and elastic particles were each 260 ° C from the multi-hold die.
- the PMMAfi ⁇ O / zn ⁇ Zl ⁇ PMM A layer (40 ⁇ m) is discharged into the chilled roll adjusted to 130 ° C and then passed through the chilled roll adjusted to 50 ° C.
- a protective film 3A for polarizing plate having a width of 600 mm and a thickness of 80 ⁇ m composed of a three-layer structure of ZPMMA layers (20 ⁇ m) was obtained by coextrusion molding.
- the protective film for polarizing plate 3A has a moisture permeability of 51 g / (m 2 '24h), a photoelastic coefficient of -5 X 10 _12 Pa _1 , and a difference in humidity expansion coefficient between adjacent layers of 2 ppmZ% RH.
- the flat surface had no linear recesses or linear protrusions.
- Each of the polymethylmetatalate resin layers has a refractive index ⁇ ( ⁇ ) as shown in FIG. 1, and the polymethylmetatalate resin layer containing elastic particles and an ultraviolet absorber has a refractive index ⁇ ) Has the distribution shown in Fig. 1.
- Both sides of the polymethylmethacrylate resin layer have a refractive index of 1.512 at a wavelength of 380 nm and a refractive index of 1.488 at a wavelength of 780 nm, and include polymethylmetataliate containing elastic particles and an ultraviolet absorber.
- the rate resin layer had a refractive index of 1.507 at a wavelength of 380 nm and a refractive index of 1.489 at a wavelength of 780 nm.
- the value of equation [1] was 0.004.
- Fig. 2 shows the difference between the refractive index ⁇ ( ⁇ ) of the polymethyl metatalylate resin layer and the refractive index ⁇ ( ⁇ ) of the polymethyl metatalylate resin layer containing elastic particles and an ultraviolet absorber. The distribution of absolute values is shown. The polymethylmethalate resin layer and the polymethylmethacrylate resin layer containing elastic particles and an ultraviolet absorber satisfied the relationship of the formula [2]. In FIG. 2, the refractive index ⁇ ( ⁇ ) of the polymethylmethacrylate resin layer and the polymethylmethacrylate containing elastic particles and an ultraviolet absorber are shown.
- FIG. 3 shows the distribution of the absolute value of the difference between the refractive index ⁇ ( ⁇ ) of the polybutyl alcohol contained in the polarizer and the refractive index ⁇ ( ⁇ ) of the polymethylmetatalylate resin layer.
- the value of Formula [4] was 0, and the relationship of Formula [5] was satisfied.
- the obtained polarizing plate is attached to the liquid crystal display device so that the film 3 mm is on the side farther from the liquid crystal panel.
- the rate 2. 8 GPa, abbreviated as “R 2 — PMMA”) is fed into a double-flight single screw extruder equipped with a 10-m-diameter leaf disk-shaped polymer filter, and the extruder outlet temperature is 260 ° C.
- the molten resin was fed to one of the multi-hold dies having a die slip surface roughness Ra of 0.1 ⁇ m.
- Example 5 In Example 5, except that R 2 —PMMA is used instead of PMMA, R 2 —PMMA layer (10 ⁇ m) ZR 1 —PMMA layer (20 ⁇ m) ZR 2 —PMMA A protective film for polarizing plate (3 mm) having a width of 600 mm and a thickness of 40 ⁇ m consisting of three layers (1 O ⁇ m) was obtained by coextrusion molding.
- the protective film for polarizing plate 3B has a moisture permeability of 105 g / (m 2 '2 4h) and a photoelastic coefficient of ⁇ 4.5 X
- the difference in humidity expansion coefficient between adjacent layers was 2 ppm Z% RH, and the surface was a flat surface without linear recesses or linear protrusions.
- R 2 — PMMA and R 1 — PMMA have almost the same distribution of ⁇ ( ⁇ ) and satisfy Equation [2].
- the R 2 —PMMA layer has a refractive index of 1.507 at a wavelength of 380 nm and a refractive index of 1.489 at a wavelength of 780 nm
- the R 1 —PMMA layer has a refractive power of 507 at a wavelength of 380 nm and a refractive index of 1 at a wavelength of 780 nm. 489.
- the value of the formula [1] was 0.
- a 1.5 mol ZL isopropyl alcohol solution of potassium hydroxide in 25 mLZm 2 was applied to one side of an 80 ⁇ m-thick triacetylcellulose film and dried at 25 ° C for 5 seconds. Next, the film was washed with running water for 10 seconds, and finally the surface of the film was dried by blowing air at 25 ° C. to obtain a film 4A in which only one surface of the triacetyl cellulose film was saponified.
- Example 1 instead of alicyclic olefin polymer, polycarbonate resin (water absorption 0.2%, photoelastic coefficient 70 X 10 _12 Pa _1 , haze 0.08 %, humidity expansion coefficient 32ppm Z% RH
- a protective film 5A for a polarizing plate having a three-layer structure was prepared in the same manner as in Example 1 except that the tensile elastic modulus 2.5 GPa, abbreviated as “PC”.
- the polarizing plate protective film 5A has a moisture permeability of 22 g / (m 2 '24h), a photoelastic coefficient of 27 X 10 _12 Pa _1 , and a difference in humidity expansion coefficient between adjacent layers of 13 ppmZ% RH.
- the surface was a flat surface with no linear recesses or linear protrusions.
- Each of the polymethylmethacrylate layers had the distribution of refractive index ⁇ ( ⁇ ) shown in FIG. 1, and the polycarbonate resin layer had a distribution of refractive index ⁇ ( ⁇ ) shown in FIG.
- a polarizing plate 7 was obtained in the same manner as in Example 1 except that 5 mm of this film was used instead of 1 mm of film.
- Fig. 2 shows the absolute value distribution of the difference between the refractive index ⁇ ( ⁇ ) of the polymethylmethacrylate resin layer and the refractive index ⁇ ( ⁇ ) of the polycarbonate resin layer.
- the polymethylmetatalate resin layer and the polycarbonate resin layer did not satisfy the relationship of the formula [2].
- Figure 3 shows the distribution of the absolute value of the difference between the refractive index ⁇ ( ⁇ ) of the polybutyl alcohol contained in the polarizer and the refractive index ⁇ ( ⁇ ) of the polymethylmetatalylate resin layer. It was.
- the polycarbonate resin layer has a refractive index of 1.608 at a wavelength of 380 ⁇ m and a refractive index of 1.556 at a wavelength of 780 nm, and both the polymethylmetatalate resin layers on both sides have a refractive index of 1 at a wavelength of 380 nm. .512, wavelength 7
- the refractive index at 80 nm was 1.488.
- the value of the formula [1] was 0.028, and the value of the formula [4] was 0.
- the evaluation results are shown in Tables 1 and 2.
- the obtained polarizing plate is attached to the liquid crystal display device so that the film 5A is on the far side of the liquid crystal panel.
- Example 3 a polyethylene terephthalate film having a refractive index of 1.715 at a wavelength of 380 nm and a refractive index of 1.631 at a wavelength of 780 nm (water absorption 0.5%, photoelastic coefficient) instead of a triacetyl cellulose film.
- PET tensile modulus 5GPa
- Polarizing plate protection film 6A the moisture permeability 54gZ (m 2 '24h), photoelastic coefficient of 50 X 10 _ 12 Pa _1, humidity expansion coefficient difference between adjacent layers was 16ppmZ% RH.
- the surface of the protective film 6A for polarizing plate was a surface on which a linear recess having a depth of the linear recess of 20 nm to 50 nm and a width of 500 nm to less than 800 nm was formed.
- the polymethyl methacrylate layer has a refractive index ⁇ ( ⁇ ) having the distribution shown in FIG. 1, and the polyethylene terephthalate resin layer has the refractive index ⁇ ( ⁇ ) shown in FIG. It was.
- FIG. 2 shows the distribution of the absolute value of the difference between the refractive index ⁇ ( ⁇ ) of the polymethylmethacrylate resin layer and the refractive index ⁇ ( ⁇ ) of the polyethylene terephthalate resin layer.
- the polymethylmethalate resin layer and the polyethylene terephthalate resin layer did not satisfy the relationship of the formula [2].
- the value of Equation [1] was 0.060, and the value of Equation [4] was 0.
- the evaluation results are shown in Tables 1 and 2.
- the obtained polarizing plate is attached to the liquid crystal display device so that the film 6 mm faces the liquid crystal panel.
- Example 1 instead of the protective film for polarizing plate 1A, a film formed by single-layer extrusion molding with a thickness of 80 ⁇ m, which is a polymethylmetatalate resin (denoted as ⁇ in the table and the drawings), is used.
- a polarizing plate 9 was obtained in the same manner as in Example 1 except that 7A was used.
- the protective film for polarizing plate 7A has a moisture permeability of 0 gZ (m 2 '24h), a photoelastic coefficient of -6 X 10 _12 Pa _ 1 , and the surface has a depth of linear recesses of 20 nm to 50 nm.
- FIG. 1 shows the refractive index ⁇ ( ⁇ ) of the single-layer film layer of polymethylmethacrylate.
- the evaluation results are shown in Tables 1 and 2.
- the obtained polarizing plate is attached to the liquid crystal display device so that the film 7 mm is on the far side of the liquid crystal panel.
- thermoplastic resin is molded into a single layer to obtain a film with a thickness of 100 ⁇ m, which is cut into a size of lcm x 25cm and used as a test piece.
- This is a tensile tester (Tensilon UTM— 10T-PL, manufactured by Toyo Baldwin Co., Ltd.), and the tensile speed was 25 mmZmin. Repeat the same measurement 5 times, and use the arithmetic average value as the representative value of tensile modulus.
- thermoplastic resin A single layer of thermoplastic resin is formed to obtain a film with a thickness of 100 ⁇ m, which is cut into lcm x 25 cm to form a test piece, and an arbitrary point at the center of this test piece is connected to a prism coupler (Metricon Using model 2010), the refractive index values at wavelengths of 633 nm, 407 nm, and 532 nm under the conditions of temperature 20 ° C ⁇ 2 ° C and humidity 60 ⁇ 5% Calculate the refractive index of 380 nm and 780 nm.
- Humidity expansion coefficient (L L) / (L ⁇ ⁇ )
- Table 1 shows the difference between the humidity expansion coefficient of the intermediate layer and the humidity expansion coefficient of the layers on both sides.
- the depth of the linear concave portion, the height of the linear convex portion, and the width thereof were measured.
- the width of the concave portion and the width of the linear convex portion were defined as the depth of the linear concave portion of the film, the height of the linear convex portion, and the width thereof, and the following criteria were used for evaluation.
- A Depth of linear recess or height of linear protrusion is less than 20 nm and width is 800 nm or more
- ⁇ Depth of linear concave portion or height of linear convex portion is 20 nm or more and 50 nm or less, and width force is OO nm or more and less than 800 nm
- the depth of the linear concave portion or the height of the linear convex portion exceeds 50 nm and the width is less than 500 nm.
- An arbitrary point in the center of the film is measured using an automatic birefringence meter (Oji Scientific Instruments, KOBRA21-ADH) at a temperature of 20 ° C ⁇ 2 ° C and humidity of 60 ⁇ 5%. is there.
- the surface of the protective film for polarizing plate (viewing side) is about 5mm with a pencil tilted at an angle of 45 degrees and with an upper force of 500g. It was caught and the degree of damage was confirmed.
- Black vinyl tape No. 21 (manufactured by Nitto Denko Corporation) is attached to one side of the polarizing plate protective film (the side to be attached to the polarizer), and a spectrophotometer (manufactured by JASCO Corporation: “UV-Visible NIR Spectroscopy Using a photometer V-570 ”), the reflection spectrum at an incident angle of 5 ° on the other surface (viewing side surface) of the polarizing plate protective film was measured to obtain the reflectance (%) at a wavelength of 550 nm.
- a spectrophotometer manufactured by JASCO Corporation: “UV-Visible NIR Spectroscopy Using a photometer V-570 ”
- ⁇ ⁇ represents the light transmittance at the measurement point ( ⁇ ), and (1), (2), (3), (4), (6), (7), (8), and (9)
- the measurement point was 10 mm from the edge.
- the diagonal intersection of the test polarizing plate was used as the measurement point.
- the fluctuation range of the polarization degree is 0.5 or less
- X Polarization degree fluctuation range is greater than 0.5
- the polarizing plate was punched out to lcm ⁇ 5cm to obtain a film piece.
- This piece of film was wrapped around a 3mm ⁇ steel rod and tested for the ability of the wound piece to break at the rod. The test was conducted 10 times in total, and the flexibility was expressed by the following index according to the number of times of bending force.
- the reassembled LCD TV was installed in an environment with an ambient brightness of 500 lux, and when the screen display was black, the display screen was visually observed and evaluated according to the following criteria.
- Y Display screen color is black
- the obtained polarizing plate is bonded to the liquid crystal cell so that the protective film for polarizing plate ⁇ ⁇ ⁇ is on the viewing side, and the liquid crystal television is reassembled.
- the rank was evaluated according to the following criteria.
- ⁇ The worker does not feel uncomfortable even if it is used for a long time (for example, about 1 to 2 hours).
- thermoplastic resin layer constituting the protective film having the relationship of the above formula [1] is excellent in all of color reproducibility, interference fringes, visibility and the like.
- the color reproducibility, interference fringes, and visibility are not good for those not having the relationship of the formula [1].
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Abstract
Description
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Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
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US11/922,561 US7998563B2 (en) | 2005-06-21 | 2006-06-21 | Protective film for polarizing plate |
KR1020077029756A KR101293328B1 (ko) | 2005-06-21 | 2006-06-21 | 편광판용 보호필름 |
CN200680022410XA CN101203778B (zh) | 2005-06-21 | 2006-06-21 | 用于偏振片的保护膜 |
JP2007522309A JPWO2006137427A1 (ja) | 2005-06-21 | 2006-06-21 | 偏光板用保護フィルム |
EP20060767054 EP1898240B1 (en) | 2005-06-21 | 2006-06-21 | Protective film for polarizing plate |
US13/179,969 US8202610B2 (en) | 2005-06-21 | 2011-07-11 | Protective film for polarizing plate |
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JP2005-181267 | 2005-06-21 | ||
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JP2005-181266 | 2005-06-21 | ||
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US11/922,561 A-371-Of-International US7998563B2 (en) | 2005-06-21 | 2006-06-21 | Protective film for polarizing plate |
US13/179,969 Division US8202610B2 (en) | 2005-06-21 | 2011-07-11 | Protective film for polarizing plate |
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EP (2) | EP2343580B1 (ja) |
JP (2) | JPWO2006137427A1 (ja) |
KR (1) | KR101293328B1 (ja) |
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Also Published As
Publication number | Publication date |
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CN101203778A (zh) | 2008-06-18 |
JP5447612B2 (ja) | 2014-03-19 |
US7998563B2 (en) | 2011-08-16 |
EP2343580B1 (en) | 2012-12-05 |
US20090086320A1 (en) | 2009-04-02 |
US8202610B2 (en) | 2012-06-19 |
TW200710453A (en) | 2007-03-16 |
EP1898240A4 (en) | 2009-10-21 |
KR101293328B1 (ko) | 2013-08-06 |
EP1898240B1 (en) | 2013-05-01 |
KR20080037622A (ko) | 2008-04-30 |
TWI402541B (zh) | 2013-07-21 |
JPWO2006137427A1 (ja) | 2009-01-22 |
US20110261298A1 (en) | 2011-10-27 |
EP1898240A1 (en) | 2008-03-12 |
EP2343580A1 (en) | 2011-07-13 |
CN101203778B (zh) | 2010-05-19 |
JP2013015841A (ja) | 2013-01-24 |
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