WO2013099969A1 - 偏光子保護フィルム - Google Patents
偏光子保護フィルム Download PDFInfo
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- WO2013099969A1 WO2013099969A1 PCT/JP2012/083699 JP2012083699W WO2013099969A1 WO 2013099969 A1 WO2013099969 A1 WO 2013099969A1 JP 2012083699 W JP2012083699 W JP 2012083699W WO 2013099969 A1 WO2013099969 A1 WO 2013099969A1
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- WIPO (PCT)
- Prior art keywords
- protective film
- film
- acid
- polarizer protective
- resin
- Prior art date
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Classifications
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- 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
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
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- 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
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- 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
- B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
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- 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
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
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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
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
- G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
-
- 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
- B32B2250/00—Layers arrangement
- B32B2250/24—All layers being polymeric
-
- 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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/30—Properties of the layers or laminate having particular thermal properties
- B32B2307/308—Heat stability
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- 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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/40—Properties of the layers or laminate having particular optical properties
- B32B2307/412—Transparent
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- 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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/40—Properties of the layers or laminate having particular optical properties
- B32B2307/42—Polarizing, birefringent, filtering
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- 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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/514—Oriented
- B32B2307/516—Oriented mono-axially
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- 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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/706—Anisotropic
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- 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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/714—Inert, i.e. inert to chemical degradation, corrosion
-
- 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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/732—Dimensional properties
- B32B2307/734—Dimensional stability
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- 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
- B32B2457/00—Electrical equipment
- B32B2457/20—Displays, e.g. liquid crystal displays, plasma displays
- B32B2457/202—LCD, i.e. liquid crystal displays
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- G02B1/105—
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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
-
- 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
Definitions
- the present invention is a polypropylene resin having excellent transparency, high brightness, good heat resistance and moisture resistance, and excellent adhesion to hydrophilic adhesives such as polyvinyl alcohol (PVA) adhesives.
- the polarizer protective film which consists of.
- a polarizing plate generally has a protective film laminated on both sides of a polarizing film having a polarizing function via an adhesive layer.
- a typical polarizing film currently known there is a polyvinyl alcohol polarizing film in which iodine or a dichroic dye is dyed on a polyvinyl alcohol film.
- These polarizing films are produced by forming an aqueous solution of polyvinyl alcohol and dyeing it by uniaxial stretching, or uniaxially stretching after dyeing, and then preferably performing a durability treatment with a boron compound.
- cellulose acetate type films such as triacetyl cellulose (TAC) are widely used.
- TAC triacetyl cellulose
- the polyvinyl alcohol-type film and the cellulose acetate-type film are both hydrophilic for bonding of the polyvinyl alcohol-type polarizing film and the protective film, a hydrophilic adhesive is generally used.
- a polarizing plate using a cellulose acetate-based film as a protective film has a disadvantage that it has poor moisture resistance, and has a problem that water absorption increases when placed in a high humidity atmosphere for a long time. As water absorption progresses, the adhesive strength of the hydrophilic adhesive decreases, and peeling occurs between the polarizing film and the protective film. As a result, the polarizing properties decrease, and the dimensional stability decreases. It will be damaged.
- a polarizing plate using a cellulose acetate-based film as a protective film tends to be inferior in heat resistance, and when placed at a high temperature, the brightness is lowered and transparency may be insufficient.
- the polypropylene resin film has characteristics required for a protective film for a polarizing plate (polarizer), such as low birefringence, high transparency, and low moisture permeability.
- the polypropylene-based resin does not have a polar group in the structure, the adhesiveness with a polarizing film made of a polyvinyl alcohol-based resin is not sufficient.
- Patent Document 1 a polypropylene resin synthesized with a metallocene catalyst is bonded to a polarizing film using a PVA adhesive, and in this case, it is considered that the adhesiveness between the polarizing film and the protective film is insufficient. .
- Patent Document 2 the adhesion is improved by subjecting the polypropylene resin to corona treatment.
- a water-soluble polyamide epoxy resin is still added to the PVA-based adhesive, so that it can be completely adhered. Takes a very long time.
- an object of the present invention is to provide a polarizer protective film that has excellent moisture resistance and high transparency of a polypropylene resin film and has high adhesion to a hydrophilic adhesive such as a polyvinyl alcohol-based adhesive. It is in.
- the present invention is as follows. (1) Laminated on at least one surface of a base film composed of a polypropylene-based resin so that an adhesion improving layer composed of an acid-modified resin composition containing a polyolefin resin as a main component and containing a polar group is the outermost surface. A polarizer protective film, wherein the retardation measured at 550 nm is 100 nm or less. (2) The polarizer protective film according to (1), wherein the acid-modified resin composition is mainly composed of an acid-modified polyolefin resin. (3) The polarizer protective film according to (2), wherein the acid-modified polyolefin resin constituting the adhesion improving layer has an acid-modified amount of 0.1% by mass or more.
- a polarizing plate comprising the polarizer protective film according to any one of (1) to (6) and a polarizing film bonded together with a polyvinyl alcohol adhesive.
- the polarizing plate according to (7) or (8), wherein the surface on which the polarizer protective film is bonded is disposed on the light source side.
- the polarizer protective film of the present invention has excellent transparency, small retardation, good heat resistance and moisture resistance, and excellent adhesion to a polyvinyl alcohol-based adhesive. Therefore, it is suitable as a polarizer protective film.
- the polarizer protective film of this invention is a protective film used for polarizers, such as a polarizing plate, it bonds together to the polarizing film which comprises a polarizing plate, and protects a polarizing film.
- the polarizer protective film of the present invention is a laminated film laminated on at least one surface of a base film so that the adhesion improving layer becomes the outermost surface.
- the polarizer protective film of the present invention may have a two-layer structure including a base film and an adhesion improving layer, or may have a multilayer structure of three or more layers.
- other layers are not particularly limited as long as at least two layers are the base film and the adhesion improving layer.
- the stacking order of each layer is not limited except that at least the adhesion improving layer is disposed on the outermost surface.
- the base film in the present invention is composed of a polypropylene resin.
- the polypropylene-based resin is a resin mainly composed of propylene units, and is generally crystalline.
- the polypropylene resin may be a propylene homopolymer or a copolymer of propylene and a comonomer copolymerizable therewith.
- the polypropylene resin is a copolymer, it may be a random copolymer or a block copolymer.
- Examples of the comonomer copolymerizable with propylene include ethylene and ⁇ -olefins having 4 to 20 carbon atoms (preferably 5 to 19 carbon atoms).
- the ⁇ -olefins specifically include 1-butene, 2-methyl-1-propene (above C4); 1-pentene, 2-methyl-1-butene, 3-methyl-1-butene (above C5); 1-hexene, 2-ethyl-1-butene, 2,3-dimethyl-1-butene, 2-methyl-1-pentene, 3-methyl-1-pentene, 4-methyl-1-pentene, 3 , 3-dimethyl-1-butene (above C6); 1-heptene, 2-methyl-1-hexene, 2,3-dimethyl-1-pentene, 2-ethyl-1-pentene, 2-methyl-3-ethyl -1-butene (above C7); 1-octene, 5-methyl-1-heptene, 2-ethyl
- the polypropylene resin is, for example, a solution polymerization method using an inert solvent typified by a hydrocarbon compound such as hexane, heptane, octane, decane, cyclohexane, methylcyclohexane, benzene, toluene, xylene, and a liquid monomer as a solvent. It can be produced by a bulk polymerization method to be used or a gas phase polymerization method in which a gaseous monomer is polymerized as it is. Polymerization by these methods may be carried out batchwise or continuously.
- an inert solvent typified by a hydrocarbon compound such as hexane, heptane, octane, decane, cyclohexane, methylcyclohexane, benzene, toluene, xylene, and a liquid monomer as a solvent. It can be produced by a bulk polymerization
- the stereoregularity of the polypropylene resin may be any of isotactic, syndiotactic, and atactic.
- the polypropylene resin preferably has a melt flow rate (MFR) measured at a temperature of 230 ° C. and a load of 21.18 N in accordance with JIS-K7210 of 0.1 to 200 g / 10 min, more preferably 0.5 to 50 g / 10 min.
- MFR melt flow rate
- the thickness of the base film is not particularly limited, but is preferably 5 to 200 ⁇ m, more preferably 10 to 150 ⁇ m. When the thickness of the base film is within this range, the optical characteristics including retardation can be easily controlled within a predetermined range.
- the base film may be blended with known additives as long as the effects of the present invention are not impaired.
- the additive include an antioxidant, an ultraviolet absorber, an antistatic agent, a lubricant, a nucleating agent, an antifogging agent, and an antiblocking agent.
- an antioxidant for example, a phenol-based antioxidant, a phosphorus-based antioxidant, a sulfur-based antioxidant, a hindered amine-based light stabilizer, and the like can be used, and for example, a unit having a phenol-based antioxidant mechanism It is also possible to use a composite antioxidant having both a phosphorus-based antioxidant mechanism unit in one molecule.
- the UV absorber for example, a UV absorber such as 2-hydroxybenzophenone or hydroxyphenylbenzotriazole, a benzoate UV blocker, or the like can be used.
- the antistatic agent may be polymer type, oligomer type, or monomer type.
- the lubricant for example, higher fatty acid amides such as erucic acid amide and oleic acid amide, higher fatty acids such as stearic acid, and salts thereof can be used.
- the nucleating agent for example, a sorbitol nucleating agent, an organic phosphate nucleating agent, a polymer nucleating agent such as polyvinylcycloalkane, and the like can be used.
- the anti-blocking agent fine particles having a spherical shape or a shape close thereto can be used regardless of inorganic type or organic type. These additives may be used alone or in combination of two or more.
- the adhesion improving layer in the present invention is composed of an acid-modified resin composition containing a polyolefin resin as a main component and a polar group.
- the acid-modified resin composition is preferably composed mainly of an acid-modified polyolefin resin.
- the polyolefin resin has a polar group, but the present invention is not limited to this, for example, other than the polyolefin resin.
- a composition obtained by introducing a polar group into a resin and mixing the other resin with an unmodified polyolefin resin may be used as the acid-modified resin composition.
- the acid-modified polyolefin resin is a polyolefin resin containing at least one kind of polar group, and examples thereof include a chain or cyclic olefin having 2 to 20 carbon atoms as a skeleton.
- the skeleton includes those having ethylene, propylene, butene, hexene, octene, methylpentene, cyclic olefin, and the like.
- the acid-modified polyolefin resin in the present invention is preferably a polypropylene resin containing a propylene monomer as a skeleton from the viewpoint of adhesiveness to the polypropylene resin constituting the base film.
- the acid-modified polyolefin resin may be a homopolymer using one type of the above monomer or a copolymer using two or more types of monomers.
- the polar group possessed by the acid-modified polyolefin resin may be appropriately selected depending on the kind of member to be adhered, the necessary adhesion, and the like, but preferably contains at least a carboxyl group, such as a carboxylic acid group or a carboxylic acid metal base. And acid anhydride groups (such as maleic anhydride groups).
- the polar group may be one kind or two or more kinds.
- the polar group in the acid-modified polyolefin resin may be directly introduced into the polymer chain of the polyolefin resin.
- the acid-modified polyolefin resin in the present invention can be used after being modified by reacting a compound capable of reacting with, for example, a carboxylic acid group or a hydroxyl group introduced into the terminal or inside of the molecular chain. It is.
- the acid modification amount of the acid-modified polyolefin resin constituting the adhesion improving layer is preferably 0.1% by mass or more, more preferably 0.2% by mass or more, and further preferably 0.3% by mass or more. It is.
- the upper limit of the acid modification amount is not particularly limited, but is preferably 1% by mass or less, more preferably 0.7% by mass or less, and still more preferably 0.5% by mass or less.
- the acid modification amount of the acid-modified polyolefin resin can be measured by the method described in Examples when the polyolefin resin is modified with (anhydrous) maleic acid, for example. That is, a thin piece prepared from an acid-modified polyolefin resin is extracted with acetone to remove unreacted (anhydrous) maleic acid and air-dried to obtain a sample for evaluation, and the absorbance of this sample for evaluation is measured with an infrared spectrometer. The calculation may be performed based on the absorption due to the C—O stretching caused by the carbonyl group in the acid anhydride group of maleic acid and the absorption due to the C—O stretching caused by the carbonyl group in the carboxylic acid of maleic acid. In the case of modification with an acid other than (anhydrous) maleic acid, the amount of acid modification can be calculated by utilizing the absorption caused by the specific group of the acid.
- the adhesion improving layer is formed using the acid-modified polyolefin resin as a main component.
- the acid-modified polyolefin resin constituting the adhesion improving layer may be only one type or two or more types.
- the adhesion improving layer may be composed of an acid-modified resin composition containing an acid-unmodified polyolefin resin (for example, polypropylene) that does not contain a polar group and other types of resins.
- an acid-modified resin composition containing a resin other than the acid-modified polyolefin resin the content of the acid-modified polyolefin resin is preferably 10% by mass or more, more preferably 30% by mass or more, and further preferably 50%. It is at least 90% by mass, particularly preferably at least 90% by mass.
- the adhesion improving layer may be a single area layer or may be laminated on both sides of the base film.
- the thickness of the adhesion improving layer is not particularly limited, but the total thickness is preferably 2 to 200 ⁇ m, more preferably 5 to 150 ⁇ m.
- the thickness of one adhesion improving layer is preferably 1 to 100 ⁇ m, more preferably 2.5 to 75 ⁇ m.
- the thickness composition ratio of the base film / adhesion improving layer is preferably 100/1 to 3/1, more preferably 20/1 to 4/1. When the thickness ratio between the two is within this range, it becomes easy to balance the effect of suppressing the decrease in luminance and the effect of improving adhesiveness.
- the adhesion improving layer may be subjected to a surface activation treatment such as a corona discharge treatment, a glow discharge treatment, a flame treatment, an ultraviolet irradiation treatment, an electron beam irradiation treatment and an ozone treatment within a range not impairing the object of the present invention.
- a surface activation treatment such as a corona discharge treatment, a glow discharge treatment, a flame treatment, an ultraviolet irradiation treatment, an electron beam irradiation treatment and an ozone treatment within a range not impairing the object of the present invention.
- the manufacturing method of the polarizer protective film of this invention is not specifically limited.
- the method of melt coextrusion molding 1) is preferable from the viewpoint of economy.
- a known method such as a melt extrusion molding method may be employed, or a commercially available film may be used. it can.
- the melt (co) extrusion method in the case of melt coextrusion molding in the above 1) and the melt film extrusion molding of the base film or the adhesion improving layer in the above methods 2) and 3) is not particularly limited. , T-die method, inflation method and the like can be employed.
- the laminated film (polarizer protective film) formed by the melt coextrusion molding of 1) and the substrate film and the adhesion improving layer formed by the melt coextrusion molding in the methods of 2) and 3) are not yet used.
- the stretched film may be a stretched film or may be stretched. However, in order to keep the retardation small, the (laminated) film formed by the melt (co) extrusion molding is not stretched, that is, unstretched. An as-is film is preferred.
- melt extrusion molding method generally, a resin melted by an extruder is extruded from a die into a sheet shape, and the sheet is cooled and solidified by being brought into close contact with a cooling roll to form a film.
- the method for bringing the extruded sheet into close contact with the cooling roll is not particularly limited, and examples thereof include a pressing method using a pressing roll, a pressing method using gas pressure, a suction method, and an electrostatic adhesion method.
- a pressing method using the gas pressure include a so-called air knife method in which pressing is performed with a gas pressure such as air
- the suction method includes, for example, a vacuum chamber method in which suction is performed with a decompression nozzle to make contact.
- the electrostatic contact method include a method in which the electrostatic contact is used.
- the method of sticking these extruded sheets to the cooling roll may be used alone or in combination with a plurality of methods. However, in order to increase the thickness accuracy of the obtained film, the latter is preferably performed. This is an embodiment.
- the thickness of the polarizer protective film of the present invention is preferably from 5 to 500 ⁇ m, more preferably from 10 to 300 ⁇ m, and even more preferably from 20 to 200 ⁇ m. However, the thickness varies greatly depending on the layer structure and production method.
- the thermal shrinkage rate at 120 ° C. for 30 minutes in the width direction and the longitudinal direction of the polarizer protective film of the present invention is preferably 1.0% or less, more preferably 0.8% or less. If the value of thermal shrinkage exceeds 1.0%, the film will shrink significantly when heat processing is performed in the post-processing step or when it is used at high temperatures for a long time as a member for display applications. This is not preferable because distortion occurs in the optical axis, flatness deterioration, wrinkles, curls, and the like occur.
- the retardation value measured at 550 nm of the polarizer protective film of the present invention is 100 nm or less.
- the retardation value of the film of the present invention is preferably 80 nm or less, more preferably 50 nm or less, and further preferably 45 nm or less.
- the retardation is large, the wavelength dependence of the light transmittance increases, and rainbow spots occur. Therefore, by setting the retardation within the above range, the wavelength dependency is small, and the occurrence of rainbow spots can be suppressed.
- the polarizer protective film of the present invention preferably has a retardation variation of 100 nm / m or less in the film width direction. That is, it is preferable that the difference between the maximum value and the minimum value when the retardation is measured in the film width direction 1 m is 100 nm or less in the polarizer protective film of the present invention. Thereby, even in a wide film corresponding to the enlargement of the screen, the retardation is stable on the plane of the film, and the occurrence of color spots can be suppressed.
- the variation in retardation in the film width direction is more preferably 80 nm / m or less, further preferably 50 nm / m or less, and particularly preferably 20 nm / m or less.
- the maximum strain of the orientation main axis of the polarizer protective film of the present invention is preferably 5 degrees or less, more preferably 3 degrees or less, and further preferably 2 degrees or less. If it is larger than 5 degrees, light leakage occurs during black display, and the contrast is lowered, which is not preferable.
- the maximum strain of the orientation principal axis is the magnitude of variation of the orientation principal axis in the film width direction, and corresponds to the deflection width when the optical axis tilt angle is measured.
- the maximum strain of the orientation main axis can be measured, for example, by the method described in the examples.
- the length in the width direction of the polarizer protective film of the present invention is not particularly limited depending on the specification, but is preferably 1.0 m or more, more preferably 1.5 m or more, still more preferably 2.0 m or more, and even more preferably. Is 3.0 m or more.
- the film width direction is in the above range, it can be suitably applied to a polarizing plate for large screen applications.
- the polarizing plate in the present invention is formed by bonding the above-described polarizer protective film of the present invention and a polarizing film with an adhesive.
- the polarizing film is not particularly limited as long as it is a film or sheet having a polarizing function, and for example, a film obtained by dyeing iodine or a dichroic dye with polyvinyl alcohol (PVA) or the like is preferable.
- the adhesive is not limited as long as it is transparent and has adhesiveness to both the polarizer protective film and the polarizing film.
- crosslinked property by active rays such as a heat
- transparent monomers and oligomers having a high affinity for both the polarizer protective film and the polarizing film and transparent monomers and oligomers having a functional group that causes a crosslinking reaction in the molecule, in addition to a combination of a polymer and a crosslinking agent.
- a polyvinyl alcohol (PVA) adhesive is preferable. Since many polarizing films are mainly composed of a polyvinyl alcohol (PVA) polymer, a PVA adhesive made of a PVA polymer is preferable as the adhesive.
- PVA-based polymers include polyvinyl alcohol obtained by saponifying polyvinyl acetate; derivatives thereof; saponified products of copolymers with vinyl acetate and a copolymerizable monomer; acetalizing polyvinyl alcohol , Modified polyvinyl alcohol obtained by urethanization, etherification, grafting, or phosphoric esterification.
- Examples of the monomer copolymerizable with vinyl acetate include (anhydrous) maleic acid, fumaric acid, crotonic acid, itaconic acid, (meth) acrylic acid and other unsaturated carboxylic acids and esters thereof; ethylene, propylene, etc. ⁇ -olefin, (meth) allylsulfonic acid (soda), sulfonic acid soda (monoalkylmalate), disulfonic acid soda alkylmalate, N-methylolacrylamide, acrylamide alkylsulfonic acid alkali salt, N-vinylpyrrolidone, N -Vinylpyrrolidone derivatives; and the like. These PVA polymers may be used alone or in combination of two or more.
- the saponification degree of the PVA polymer is not limited, but is preferably 60 to 85%.
- the crosslinking agent when a PVA polymer is used is not particularly limited, but water-soluble or water-dispersible ones are preferable.
- it has crosslinkability with a hydroxyl group, and examples thereof include melamine-based, isocyanate-based, carbodiimide-based, oxazoline-based, and epoxy-based compounds.
- melamine-based, isocyanate-based, carbodiimide-based, and oxazoline-based compounds are preferable.
- a melamine compound or an isocyanate compound having a polyvinyl alcohol structure is preferable.
- you may use a catalyst etc. suitably as needed.
- the polarizing plate of the present invention may be one in which the polarizer protective film of the present invention is bonded to one side of the polarizing film, or may be one in which the polarizer protective film of the present invention is bonded to both sides of the polarizing film. Good.
- the polarizer protective film of the present invention is bonded to one surface of the polarizing film, and various protective films conventionally used (for example, a triacetyl cellulose (TAC) film) are bonded to the other surface. Also good.
- TAC triacetyl cellulose
- the polarizing plate of the present invention is preferably used by arranging the surface on which the polarizer protective film is bonded to the light source side.
- Front luminance reduction Measurement was performed using a color luminance measuring device ("RISA-COLOR / ONE-II" manufactured by Highland).
- the polarizer protective film obtained in Examples and Comparative Examples is applied to one surface of a polarizing film made of polyvinyl alcohol (PVA) and iodine so that the absorption axis of the polarizing film and the flow direction of the polarizer protective film are parallel to each other.
- a polarizing plate was prepared by pasting with a polyvinyl alcohol adhesive (“Poval” manufactured by Kuraray Co., Ltd.) and a triacetyl cellulose (TAC) film on the other surface.
- the obtained polarizing plate is placed horizontally on the backlight so that the polarizer protective film is on the light source side, the liquid crystal screen is in a white display state, and the CCD camera is fixed at a position 1 m in the vertical direction from the polarizing plate surface.
- the average luminance of a 50 mm square at the center of this panel was measured, and the obtained luminance was defined as Is.
- a TAC film similar to the above was attached to both surfaces of a polarizing film made of polyvinyl alcohol (PVA) and iodine similar to the above, and a polarizing plate was prepared.
- Luminance reduction rate (%) (Ib ⁇ Is / Ib) ⁇ 100 (%) (1)
- Adhesiveness A polyvinyl alcohol aqueous solution having a saponification degree adjusted to a solid content concentration of 5% by mass and having a saponification degree of 100 mol% is dried on the surface of the adhesion improving layer side of the polarizer protective film obtained in Examples and Comparative Examples.
- the sample for evaluation was produced by apply
- the opposite surface (that is, the base film surface) of the obtained evaluation sample on which the polyvinyl alcohol layer was formed was attached to a double-sided tape attached on a glass plate having a thickness of 5 mm.
- 100 grid-like cuts that penetrated the polyvinyl alcohol layer and reached the base film were made using a cutter guide with a gap interval of 2 mm.
- an adhesive tape (“Cello Tape (registered trademark) CT-24” manufactured by Nichiban Co., Ltd .; 24 mm width) was attached to 100 square cut surfaces.
- the air remaining at the interface was pressed with an eraser to bring it into close contact. Then, the operation
- the number of squares from which the polyvinyl alcohol layer was not peeled was counted to evaluate the adhesion. When the number of cells in which the polyvinyl alcohol layer was not peeled exceeded 70, the adhesion was judged as “good”, and when it was 70 or less, the adhesion was judged as “bad”.
- Retardation, optical axis tilt angle (maximum strain of orientation main axis) Measurement was performed using a retardation film / optical material inspection apparatus ("RETS100" manufactured by Otsuka Electronics Co., Ltd.).
- the size of the polarizer protective film obtained in the examples and comparative examples used as samples was 10 cm ⁇ 10 cm, the polarizer protective film was placed perpendicular to the incident light, measured at 550 nm, and the measurement spot The diameter was 2 mm, and a 100 W halogen lamp was used as the light source.
- As the measurement stage an automatic tilt rotation stage was used, and in the measurement mode, the central portion was measured by one point measurement.
- the retardation and the optical axis tilt angle maximum strain of the orientation main axis
- the retardation at the wavelength of 550 nm and the optical axis tilt angle (the maximum strain of the orientation main axis) were obtained.
- Acid-modified polyolefin resin acid-modified amount The acid-modified polyolefin resin was heated and pressed (230 ° C.) to produce flakes (10 to 17 mg / cm 2 ). The flakes were extracted with acetone over 5 hours, then air-dried, An evaluation sample was obtained. The absorbance of this sample for evaluation was measured with an infrared spectrometer and determined from the following equation.
- Maleic anhydride-modified amount (ppm) (A1790cm -1 /(8.5 ⁇ t)+(A1710cm -1 /(10.0 ⁇ t)) ⁇ 10 6
- A1790 cm ⁇ 1 Absorbance value due to CO stretching caused by a carbonyl group in the anhydride group of maleic acid (absorbance)
- Example 1 Using the first to third melt extruders, a base film made of polypropylene resin and an adhesion improving layer made of polypropylene adhesive resin which is acid-modified polyolefin resin are laminated to form a polarizer protective film Got. That is, as a base film forming material, polypropylene resin (manufactured by Sumitomo Chemical Co., Ltd.) is used as the first extruder ("PCM30 extruder” manufactured by Ikekai Tekko Co., Ltd.) and the second extruder ("PCM45 extruder manufactured by Ikekai Tekko Co., Ltd.)".
- PCM30 extruder manufactured by Ikekai Tekko Co., Ltd.
- the film was adhered to the cooling roll during the cooling by an electrostatic adhesion method.
- the surface temperature of the cooling roll was set to 20 ° C.
- the film was wound up at a speed of 5 m / min.
- Table 1 shows the properties of the obtained polarizer protective film. It turns out that the adhesiveness with respect to a PVA-type polarizing film is favorable.
- Example 2 As an adhesion improving layer forming material to be supplied to the third extruder ("PCM30 extruder” manufactured by Ikekai Tekko Co., Ltd.), a polypropylene-based adhesive resin ("Modic (registered trademark) AP P565" manufactured by Mitsubishi Chemical Corporation); melt flow rate : A polarizer protective film was produced in the same manner as in Example 1 except that 5 g / 10 min (230 ° C., acid modification amount 0.4 mass%) was used. Table 1 shows the properties of the obtained polarizer protective film. It turns out that the adhesiveness with respect to a PVA-type polarizing film is favorable.
- PCM30 extruder manufactured by Ikekai Tekko Co., Ltd.
- a polypropylene-based adhesive resin (“Modic (registered trademark) AP P565" manufactured by Mitsubishi Chemical Corporation)
- melt flow rate A polarizer protective film was produced in the same manner as in Example 1 except that 5 g / 10 min (230 ° C., acid modification amount 0.4
- the polarizer protective film of the present invention When used in, for example, a liquid crystal display device, it can contribute to the reduction in thickness and cost of the LCD, and the industrial applicability is extremely high.
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Abstract
Description
(1)ポリプロピレン系樹脂から構成される基材フィルムの少なくとも片面に、ポリオレフィン樹脂を主成分とし極性基を含有する酸変性樹脂組成物で構成される接着改良層が最表面になるように積層された積層フィルムであり、550nmで測定したリタデーションが100nm以下であることを特徴とする偏光子保護フィルム。
(2)前記酸変性樹脂組成物は、主として酸変性ポリオレフィン樹脂よりなる前記(1)に記載の偏光子保護フィルム。
(3)接着改良層を構成する酸変性ポリオレフィン樹脂の酸変性量が0.1質量%以上である前記(2)に記載の偏光子保護フィルム。
(4)前記酸変性ポリオレフィン樹脂は、極性基を含有したポリプロピレン系樹脂である前記(2)または(3)に記載の偏光子保護フィルム。
(5)フィルムの配向主軸の最大歪みが5度以下である前記(1)~(4)のいずれか一つに記載の偏光子保護フィルム。
(6)未延伸フィルムである前記(1)~(5)のいずれか一つに記載の偏光子保護フィルム。
(7)前記(1)~(6)のいずれか一つに記載の偏光子保護フィルムと偏光フィルムとをポリビニルアルコール系接着剤で貼り合わせてなることを特徴とする偏光板。
(8)接着剤がポリビニルアルコール系接着剤である前記(7)に記載の偏光板。
(9)偏光子保護フィルムが貼り合わされた面を光源側に配して用いられる前記(7)または(8)に記載の偏光板。
本発明の偏光子保護フィルムは、偏光板などの偏光子に用いられる保護フィルムであり、偏光板を構成する偏光フィルムに貼り合わせ、偏光フィルムを保護するものである。
本発明の偏光子保護フィルムは基材フィルムの少なくとも片面に、接着改良層が最表面になるように積層された積層フィルムである。
本発明における基材フィルムは、ポリプロピレン系樹脂から構成される。ここで、ポリプロピレン系樹脂とは、主にプロピレンのユニットからなる樹脂であり、一般に結晶性のものである。ポリプロピレン系樹脂は、プロピレンの単独重合体のほか、プロピレンとそれに共重合可能なコモノマーとの共重合体であってもよい。なおポリプロピレン系樹脂が共重合体である場合、ランダム共重合体であっても良いし、ブロック共重合体であっても良い。
本発明における接着改良層は、ポリオレフィン樹脂を主成分とし極性基を含有する酸変性樹脂組成物で構成される。酸変性樹脂組成物は、主として酸変性ポリオレフィン樹脂よりなるものが好ましい。なお、酸変性樹脂組成物が酸変性ポリオレフィン樹脂を主成分する場合、ポリオレフィン樹脂が極性基を有することになるが、本発明はこれに限定されるものではなく、例えば、ポリオレフィン樹脂以外の他の樹脂に極性基を導入し、該他の樹脂を未変性ポリオレフィン樹脂に混合した組成物を酸変性樹脂組成物としても構わない。
接着改良層の厚みは、特に限定されないが、総厚みが2~200μmであることが好ましく、より好ましくは5~150μmである。また一つの接着改良層の厚みは、1~100μmであることが好ましく、より好ましくは2.5~75μmである。
本発明の偏光子保護フィルムの製造方法は、特に限定されない。例えば、1)基材フィルム形成材料と接着改良層形成材料とを溶融共押し出し成型する方法、2)予め製膜した基材フィルムに接着改良層形成材料を押し出しラミネートする方法、3)予め製膜した基材フィルムと予め製膜した接着改良層とをドライラミネートする方法等を採用することができ、経済性の点では、1)の溶融共押し出し成型する方法が好ましい。2)および3)の方法を採用する場合、基材フィルムおよび接着改良層の製膜方法としては、溶融押し出し成型する方法など公知の方法を採用すればよく、また市販のフィルムを利用することもできる。
本発明の偏光子保護フィルムの厚みは5~500μmが好ましく、10~300μmがより好ましく、20~200μmがさらに好ましいと言えるが、層構成及び製造方法等により大きく変化する。
本発明における偏光板は、上述した本発明の偏光子保護フィルムと偏光フィルムとを接着剤で貼り合わせてなる。
偏光フィルムは、偏光機能を有するフィルムまたはシートであれば特に制限はなく、例えば、ポリビニルアルコール(PVA)などにヨウ素あるいは二色性色素を染着させたもの等が好ましく挙げられる。
PVA系ポリマーとしては、例えば、ポリ酢酸ビニルをけん化して得られたポリビニルアルコール;その誘導体;更に酢酸ビニルと共重合性を有する単量体との共重合体のけん化物;ポリビニルアルコールをアセタール化、ウレタン化、エーテル化、グラフト化、リン酸エステル化等した変性ポリビニルアルコール;などが挙げられる。前記酢酸ビニルと共重合性を有する単量体としては、(無水)マレイン酸、フマール酸、クロトン酸、イタコン酸、(メタ)アクリル酸等の不飽和カルボン酸及びそのエステル類;エチレン、プロピレン等のα-オレフィン、(メタ)アリルスルホン酸(ソーダ)、スルホン酸ソーダ(モノアルキルマレート)、ジスルホン酸ソーダアルキルマレート、N-メチロールアクリルアミド、アクリルアミドアルキルスルホン酸アルカリ塩、N-ビニルピロリドン、N-ビニルピロリドン誘導体;等が挙げられる。これらPVA系ポリマーは1種のみ用いても良いし2種以上を併用しても良い。なおPVA系ポリマーのケン価度は限定されないが60~85%のものが好ましい。
なお、以下の実施例、比較例における物性の評価方法は以下の通りである。
色彩輝度計測装置(ハイランド社製「RISA-COLOR/ONE-II」)を用いて測定を行った。ポリビニルアルコール(PVA)とヨウ素からなる偏光フィルムの一方の面に、実施例、比較例で得られた偏光子保護フィルムを、偏光フィルムの吸収軸と偏光子保護フィルムの流れ方向が平行になるように、ポリビニルアルコール系接着剤(クラレ社製「ポバール」)で貼り付け、他方の面にトリアセチルセルロース(TAC)フィルムを貼り付けて、偏光板を作製した。得られた偏光板を偏光子保護フィルムが光源側になるように、バックライトに水平に設置し、液晶画面は白表示状態とし、CCDカメラを偏光板表面から垂直方向1mの位置に固定して、このパネルの中央部50mm四方の平均輝度を測定して、得られた輝度をIsとした。
他方、上記と同様のポリビニルアルコール(PVA)とヨウ素からなる偏光フィルムの両面に、上記と同様のTACフィルムを上記と同様のポリビニルアルコール系接着剤で貼り付けて、偏光板を作製した。この偏光板を用いて上記と同様の測定を行い、得られた輝度をIbとし、下記(1)式で正面輝度低下率(%)を算出した。
輝度低下率(%)=(Ib-Is/Ib)×100(%) (1)
実施例、比較例で得られた偏光子保護フィルムの接着改良層側の表面に、固形分濃度5質量%に調整したけん化度が100モル%であるポリビニルアルコール水溶液を、乾燥後のポリビニルアルコール層の厚みが2μmになるようにワイヤーバーで塗布し、70℃で5分間乾燥することにより、評価用試料を作製した。ポリビニルアルコール水溶液には、判定が容易となるよう青色染料を加えたものを使用した。得られた評価用試料のポリビニルアルコール層が形成された面の反対面(すなわち、基材フィルム面)を、厚さ5mmのガラス板上に貼り付けた両面テープに貼着させた。次に、ポリビニルアルコール層を貫通して、基材フィルムに達する100個の升目状の切り傷を、隙間間隔2mmのカッターガイドを用いて付けた。次いで、粘着テープ(ニチバン社製「セロテープ(登録商標)CT-24」;24mm幅)を100個の升目状の切り傷面に貼り付けた。貼り付け時には界面に残った空気を消しゴムで押して完全に密着させた。その後、粘着テープを勢いよく垂直に引き剥がす作業を5回実施した。ポリビニルアルコール層が剥がれていない升目の個数を数え、接着性を評価した。ポリビニルアルコール層が剥がれなかった升目の数が70個を超える場合、接着性は「良」と判断し、70個以下の場合、接着性は「不良」と判断した。
ヘーズ測定器(日本電色工業株式会社製「NDH-5000」)を用いて、JIS-K7136に準拠して測定した。
位相差フィルム・光学材料検査装置(大塚電子社製「RETS100」)を用いて測定を行った。試料とする実施例、比較例で得られた偏光子保護フィルムの大きさは10cm×10cmとし、偏光子保護フィルムは入射光に対して垂直になるように設置し、550nmで測定し、測定スポット径は2mmで、光源は100Wハロゲンランプを用いた。測定ステージは自動傾斜回転ステージを用い、測定モードは1ポイント測定で中央部の測定を行った。リタデーションと光学軸傾斜角度(配向主軸の最大歪み)を同時に表示する設定で、波長550nmにおけるリタデーションと、光学軸傾斜角度(配向主軸の最大歪み)の値を得た。
JIS-K7133に準拠して測定した。加熱条件は120℃×30分で行った。
酸変性ポリオレフィン樹脂を加熱プレス(230℃)して薄片(10~17mg/cm2)を作製し、この薄片を5時間かけてアセトン抽出した後、風乾して、評価用試料を得た。この評価用試料の吸光度を赤外分光計により測定し、以下の式から求めた。
A1790cm-1:マレイン酸の酸無水物基におけるカルボニル基に起因するC-O伸縮による吸光度値(absorbance)
A1710cm-1:マレイン酸のカルボン酸におけるカルボニル基に起因するC-O伸縮による吸光度値(absorbance)
t=薄片の厚さ(μg/cm2)
第1~第3の3台の溶融押し出し機を用い、ポリプロピレン樹脂からなる基材フィルムと、酸変性ポリオレフィン樹脂であるポリプロピレン系接着性樹脂からなる接着改良層とを積層して、偏光子保護フィルムを得た。すなわち、基材フィルム形成材料として、第1の押し出し機(池貝鉄工社製「PCM30押し出し機」)と第2の押し出し機(池貝鉄工社製「PCM45押し出し機」)にポリプロピレン樹脂(住友化学社製「住友ノーブレン(登録商標)FLX80E4」;メルトフローレート:7g/10分(230℃))を供給し、冷却ロール側の表層として形成する接着改良層形成材料として、第3の押し出し機(池貝鉄工社製「PCM30押し出し機」)にポリプロピレン系の接着性樹脂(三井化学社製「アドマー(登録商標)QF551」;メルトフローレート:5.7g/10分(230℃)、酸変性量0.36質量%)を供給して、樹脂温度250℃で、Tダイ方式にて溶融共押出し、次いで鏡面の冷却ロールで冷却することにより、偏光子保護フィルムを得た。厚み構成比は、接着改良層/基材フィルム=11μm/69μmであった。上記冷却時の冷却ロールへのフィルムの密着は静電気密着法で行った。冷却ロールの表面温度は20℃に設定した。フィルムは5m/分の速度で巻き取った。
得られた偏光子保護フィルムの特性を表1に示す。PVA系偏光フィルムに対する接着性が良好であることが分かる。
第3の押し出し機(池貝鉄工社製「PCM30押し出し機」)に供給する接着改良層形成材料として、ポリプロピレン系の接着性樹脂(三菱化学社製「モディック(登録商標)AP P565」;メルトフローレート:5g/10分(230℃)、酸変性量0.4質量%)を用いた以外は、実施例1と同様の方法で偏光子保護フィルムを作製した。
得られた偏光子保護フィルムの特性を表1に示す。PVA系偏光フィルムに対する接着性が良好であることが分かる。
ポリプロピレン樹脂(住友化学社製「住友ノーブレン(登録商標)W151」;メルトフローレート:7.0g/10分(230℃))を押し出し機(池貝鉄工社製「PCM45押し出し機」)に供給し、樹脂温度250℃で、Tダイ方式にて溶融共押出し、次いで鏡面の冷却ロールで冷却することにより、厚み30μmの単層偏光子保護フィルムを得た。冷却ロールの表面温度は20℃に設定した。フィルムは5m/分の速度で巻き取った。
得られた偏光子保護フィルムの特性を表1に示す。PVA系偏光フィルムに対する接着性が不十分であることが分かる。
Claims (9)
- ポリプロピレン系樹脂から構成される基材フィルムの少なくとも片面に、ポリオレフィン樹脂を主成分とし極性基を含有する酸変性樹脂組成物で構成される接着改良層が最表面になるように積層された積層フィルムであり、550nmで測定したリタデーションが100nm以下であることを特徴とする偏光子保護フィルム。
- 前記酸変性樹脂組成物は、主として酸変性ポリオレフィン樹脂よりなる請求項1に記載の偏光子保護フィルム。
- 接着改良層を構成する酸変性ポリオレフィン樹脂の酸変性量が0.1質量%以上である請求項2に記載の偏光子保護フィルム。
- 前記酸変性ポリオレフィン樹脂は、極性基を含有したポリプロピレン系樹脂である請求項2または3に記載の偏光子保護フィルム。
- フィルムの配向主軸の最大歪みが5度以下である請求項1~4のいずれか一項に記載の偏光子保護フィルム。
- 未延伸フィルムである請求項1~5のいずれか一項に記載の偏光子保護フィルム。
- 請求項1~6のいずれか一項に記載の偏光子保護フィルムと偏光フィルムとを接着剤で貼り合わせてなることを特徴とする偏光板。
- 接着剤がポリビニルアルコール系接着剤である請求項7に記載の偏光板。
- 偏光子保護フィルムが貼り合わされた面を光源側に配して用いられる請求項7または8に記載の偏光板。
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PCT/JP2012/083699 WO2013099969A1 (ja) | 2011-12-27 | 2012-12-26 | 偏光子保護フィルム |
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JP (1) | JP2013152455A (ja) |
TW (1) | TWI579601B (ja) |
WO (1) | WO2013099969A1 (ja) |
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JPWO2015033829A1 (ja) * | 2013-09-05 | 2017-03-02 | 株式会社サンエー化研 | マスキングフィルム及びそれを用いた偏光式3d映像表示フィルムの検査方法 |
KR102388113B1 (ko) | 2014-02-28 | 2022-04-19 | 도레이 카부시키가이샤 | 2축 배향 폴리프로필렌 필름 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2003196029A (ja) * | 2001-12-25 | 2003-07-11 | Fuji Photo Film Co Ltd | タッチパネル及びタッチパネル付き液晶表示装置 |
JP2007106812A (ja) * | 2005-10-12 | 2007-04-26 | Bespack Kk | 粘着シート |
JP2008146023A (ja) * | 2006-11-17 | 2008-06-26 | Dainippon Printing Co Ltd | 光学フィルム、偏光板及び画像表示装置 |
JP2009210878A (ja) * | 2008-03-05 | 2009-09-17 | Sumitomo Chemical Co Ltd | 粘着剤層付位相差フィルム及びそれを用いた楕円偏光板及び液晶表示装置 |
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US20100062189A1 (en) * | 2006-11-17 | 2010-03-11 | Takatoshi Yosomiya | Optical film, polarizing plate and image display device |
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2012
- 2012-12-26 JP JP2012282820A patent/JP2013152455A/ja active Pending
- 2012-12-26 WO PCT/JP2012/083699 patent/WO2013099969A1/ja active Application Filing
- 2012-12-27 TW TW101150354A patent/TWI579601B/zh not_active IP Right Cessation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003196029A (ja) * | 2001-12-25 | 2003-07-11 | Fuji Photo Film Co Ltd | タッチパネル及びタッチパネル付き液晶表示装置 |
JP2007106812A (ja) * | 2005-10-12 | 2007-04-26 | Bespack Kk | 粘着シート |
JP2008146023A (ja) * | 2006-11-17 | 2008-06-26 | Dainippon Printing Co Ltd | 光学フィルム、偏光板及び画像表示装置 |
JP2009210878A (ja) * | 2008-03-05 | 2009-09-17 | Sumitomo Chemical Co Ltd | 粘着剤層付位相差フィルム及びそれを用いた楕円偏光板及び液晶表示装置 |
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JP2013152455A (ja) | 2013-08-08 |
TWI579601B (zh) | 2017-04-21 |
TW201339662A (zh) | 2013-10-01 |
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