TWI794382B - Stacked body for polarizing plate, polarizing plate, display device, and manufacturing method of polarizing plate - Google Patents

Abstract

A stacked body for polarizing plates, which is a stacked body comprising an unstretched polyvinyl alcohol resin film and a base film, wherein the retardation Re1 in the in-plane direction of the aforementioned polyvinyl alcohol resin film is 50 nm or less, and the thickness T is 45 Below μm, the above-mentioned base film is a film made of resin, the melt flow rate of the above-mentioned resin measured under specific measurement conditions is 1 g/10 minutes or more, and the tensile elastic modulus E is 50 MPa or more And 1200 MPa or less, the retardation Re2 in the in-plane direction of the extension of the said base film is 0 nm or more and 20 nm or less.

Description

Stacked body for polarizing plate, polarizing plate, display device, and manufacturing method of polarizing plate

The present invention relates to a stacked body for polarizing plates, a polarizing plate, a display device, and a method for manufacturing the polarizing plate.

Display devices such as liquid crystal display devices and organic electroluminescent (EL) display devices have conventionally been required to have a large display area, light weight, and thin thickness. Therefore, panels constituting display devices have also been required to be thinner in the past.

In a display device, a polarizing plate provided with a polarizer and a protective film for protecting the polarizer is generally used. In order to form a thin display device, the polarizing plate is also required to be thinner. In particular, since the polarizer sometimes shrinks in the use environment of the display device, in a thin and large-area display device, bending caused by such shrinkage may become a problem. Therefore, by using a thin polarizer with a thickness of 10 μm or less, in addition to the reduction in the thickness of the display device due to the reduction in the thickness of the polarizer itself, the reduction in the occurrence of warping as described above can also be expected.

However, when such a thin polyvinyl alcohol polarizer is to be manufactured by the conventional manufacturing method, melting of the polarizer frequently occurs. Several methods have been proposed as a method of manufacturing such a polarizing plate that "prevents melting of the polarizer and includes a thin polarizer".

For example, in Patent Document 1, it has been proposed to apply an aqueous solution containing a polyvinyl alcohol-based resin to an amorphous ester-based thermoplastic resin substrate, thereby manufacturing a polyvinyl alcohol-based resin layer to form a stack, and then After the body is stretched, the dichroic material is oriented to make a colored stack, and then the colored stack is stretched to obtain an optical film.

"Patent Documents" "Patent Document 1": Japanese Patent No. 4691205 (corresponding publication: US Patent No. 8314987 specification)

In the case of manufacturing a thin polarizing plate by the method described in Patent Document 1, retardation may occur in the base film after the stretching process due to stretching the stacked body at a high stretching ratio. In such a case, since it is difficult to use the base film as it is as a polarizing plate protective film, it must be peeled off and discarded, resulting in wasteful material. Furthermore, the work of additionally preparing a protective film for protecting the polarizing plate and affixing it to the polarizing plate may be added.

Therefore, an object of the present invention is to provide a stacked body for polarizing plates that "can be used even if the base film is used as a protective film, and can be efficiently produced even if it is thin", a polarizing plate and a display device including the stacked body, and The manufacturing method of the aforementioned polarizing plate.

As a result of studies conducted to solve the above-mentioned problems, the present inventors have found that by using a polyvinyl alcohol resin film having an in-plane phase difference and a thickness within a specified range, and having flexibility capable of stretching at a low temperature at a high magnification The substrate film made of resin must solve the above-mentioned problems, and further complete the present invention.

Therefore, according to the present invention, the following [1] to [15] can be provided.

[1] A stacked body for polarizing plates, which is a stacked body for polarizing plates comprising an unstretched polyvinyl alcohol resin film and a base film, wherein The retardation Re1 in the in-plane direction of the above-mentioned polyvinyl alcohol resin film is 50 nm or less, and the thickness T is 45 μm or less, The aforementioned base film is a film made of resin, The melt flow rate of the aforementioned resin is above 1 g/10 minutes, and the aforementioned melt flow rate is a value measured at 190°C under a load of 2.16 kg, The tensile modulus E of the aforementioned resin is 50 MPa or more and 1200 MPa or less, The retardation Re2 in the in-plane direction of the extension of the base film is not less than 0 nm and not more than 20 nm, and the retardation Re2 is obtained by placing the free end of the polarizing plate stack at a temperature of 50°C to 120°C. When the axis is extended to 6.0 times, and the above-mentioned base film is made into the above-mentioned extension, the retardation of the above-mentioned extension has.

[2] The stacked body for polarizing plates according to [1], wherein The aforementioned resin is a cycloolefin resin, The aforementioned cycloolefin-based resin includes a cycloolefin-based polymer, The aforementioned cycloolefin-based polymer is a hydrogenated block copolymer obtained by hydrogenating the block copolymer [D], and the block copolymer [D] is composed of: A polymer block [A] mainly composed of a repeating unit [I] derived from an aromatic vinyl compound, and Polymer block [B] mainly composed of repeating unit [I] derived from aromatic vinyl compound and repeating unit [II] derived from chain conjugated diene compound, or polymer block [B] derived from chain conjugated diene compound The repeating unit [II] of an alkene compound is formed as a polymer block [C] of the main component.

[3] A stacked body for polarizing plates, which is a stacked body for polarizing plates comprising an unstretched polyvinyl alcohol resin film and a base film, wherein The retardation Re1 in the in-plane direction of the above-mentioned polyvinyl alcohol resin film is 50 nm or less, and the thickness T is 45 μm or less, The aforementioned base film is a film made of resin, The aforementioned resin is a cycloolefin resin, The aforementioned cycloolefin-based resin includes a cycloolefin-based polymer, The aforementioned cycloolefin-based polymer is a hydrogenated block copolymer obtained by hydrogenating the block copolymer [D], and the block copolymer [D] is composed of: A polymer block [A] mainly composed of a repeating unit [I] derived from an aromatic vinyl compound, and Polymer block [B] mainly composed of repeating unit [I] derived from aromatic vinyl compound and repeating unit [II] derived from chain conjugated diene compound, or polymer block [B] derived from chain conjugated diene compound The repeating unit [II] of the olefinic compound is used as the polymer block [C] of the main component, The retardation Re2 in the in-plane direction of the extension of the base film is not less than 0 nm and not more than 20 nm, and the retardation Re2 is obtained by placing the free end of the polarizing plate stack at a temperature of 50°C to 120°C. When the axis is extended to 6.0 times, and the above-mentioned base film is made into the above-mentioned extension, the retardation of the above-mentioned extension has.

[4] The polarizing plate stack according to [2] or [3], wherein the cycloolefin-based resin contains a plasticizer, a softener, or both.

[5] The stacked body for polarizing plates according to [4], wherein the plasticizer, the softener, or both are one or more selected from ester-based plasticizers and aliphatic hydrocarbon polymers.

[6] The laminate for polarizing plates according to any one of [1] to [5], wherein the resin contains an organometallic compound.

[7] The laminate for polarizing plates according to any one of [1] to [6], wherein the base film is stacked on the polyvinyl alcohol resin film through an adhesive layer.

[8] A polarizing plate obtained by uniaxially stretching the stacked body for polarizing plates according to any one of [1] to [7].

[9] The polarizing plate according to [8], wherein a protective film or an adhesive is provided on a surface of the polyvinyl alcohol resin film of the polarizing plate on which the base film is not stacked.

[10] The polarizing plate according to [9], wherein the protective film is made of one or more resins selected from cycloolefin resins, acrylic resins, polyethylene terephthalate resins, and triacetylcellulose resins.

[11] A display device having two substrates, a liquid crystal layer located therebetween, and The polarizing plate according to any one of [8] to [10], wherein the polarizing plate is disposed outside at least one of the two substrates.

[12] A display device having two substrates, a light emitting layer therebetween, and The polarizing plate according to any one of [8] to [10], wherein the polarizing plate is disposed outside one of the two substrates.

[13] The display device according to [11], wherein a base film of the polarizing plate is provided between the polyvinyl alcohol resin film of the polarizing plate and the liquid crystal layer.

[14] The display device according to [12], wherein a base film of the polarizing plate is provided between the polyvinyl alcohol resin film of the polarizing plate and the light-emitting layer.

[15] A method for producing a polarizing plate, comprising the step of uniaxially stretching the stacked body for polarizing plates according to any one of [1] to [7].

According to the present invention, it is possible to provide a stacked body for polarizing plates that "can be used even if the base film is used as a protective film, and can be efficiently manufactured even if it is thin", a polarizing plate and a display device using the stacked body, and a polarizing plate using the aforementioned stacked body. The manufacturing method of the polarizing plate of the stacked body.

Embodiments and examples are disclosed below to describe the present invention in detail. However, the present invention is not limited by the implementation forms and examples described below, and can be implemented with arbitrary changes without departing from the patent scope of the present invention and its equivalent scope.

In this application, the so-called "strip-shaped" film refers to a film with a length of 5 times or more, preferably 10 times or more, with respect to the width of the film. Rolled into rolls with a length sufficient for storage or transportation. The upper limit of the ratio of the length to the width of the film is not particularly limited, but may be set at, for example, 100,000 times or less.

In this application, the retardation Re in the in-plane direction of the film and the retardation Rth in the thickness direction follow the formula Re=(nx-ny)×d and Rth={[(nx+ny)/2]-nz}×d And figured out. And the Nz coefficient of the thin film is a value represented by [(nx-nz)/(nx-ny)], which can also be expressed as [(Rth/Re)+0.5]. Here, nx is the refractive index in the direction of the slow axis in the plane of the film (the maximum refractive index in the plane), ny is the refractive index in the direction perpendicular to the slow axis in the plane of the film, and nz is the thickness direction of the film The refractive index, the thickness (nm) of the d-series film. The measurement wavelength, unless otherwise noted, is set to be a representative wavelength of 550 nm in the visible light region.

[Example 1: Stacked body for polarizing plates and polarizing plates]

The stacked body for polarizing plates according to Embodiment 1 which is one embodiment of the present invention, the polarizing plate manufactured using the stacked body, and its manufacturing method will be described below with reference to FIGS. 1 to 4 .

[1. Stacked body for polarizing plates]

The stacked body for polarizing plates of the present invention (hereinafter also simply referred to as "stacked body") includes an unstretched polyvinyl alcohol resin film and a base film. FIG. 1 is an example of a schematic cross-sectional view of a stacked body 10 according to Embodiment 1 of the present invention. As shown in FIG. 1 , the stacked body 10 of this embodiment includes an unstretched polyvinyl alcohol resin film 11 and a base film 12 disposed on the polyvinyl alcohol resin film 11 . In FIG. 1 , 13 is an adhesive for bonding the polyvinyl alcohol resin film 11 and the base film 12 . The stacked body 10 of the present invention is a material used to manufacture polarizers (polarizers).

[Polyvinyl alcohol resin film]

In the present invention, the polyvinyl alcohol resin film is a film having a retardation Re1 in the in-plane direction of 50 nm or less and a thickness T of 45 μm or less. Polyvinyl alcohol resin film is an unstretched film made of polyvinyl alcohol resin (hereinafter, "polyvinyl alcohol" is sometimes abbreviated as "PVA"). In this application, the so-called "unstretched film" refers to one that has not been subjected to stretching treatment.

In the present invention, the PVA resin film (polyvinyl alcohol resin film) is not necessarily limited, but in terms of availability, etc., it can be produced by using polyvinyl acetate obtained by polymerizing vinyl acetate to saponify better. The PVA contained in the PVA resin preferably has a degree of polymerization in the range of 500 to 8000, and a degree of saponification of 90 mol% or more, from the viewpoint of excellent extensibility and the polarizing performance of an obtainable polarizer. Here, the degree of polymerization is an average degree of polymerization measured in accordance with the description of JIS K6726-1994, and the degree of saponification is a value measured in accordance with the description of JIS K6726-1994. The preferred range of the degree of polymerization is 1000-6000, more preferably 1500-4000. The preferred range of saponification degree is above 95 mole%, more preferably above 99 mole%. PVA can also be a copolymer or graft polymer of vinyl acetate and other copolymerizable monomers.

In this invention, the manufacturing method of a PVA resin film is not specifically limited, It can manufacture by arbitrary methods, such as a well-known method. Examples of production methods include: cast film production using a PVA solution in which PVA is dissolved in a solvent as a film production stock solution, wet film production (draining into a poor solvent), dry and wet film production , Gel film-making method (first cooling the PVA aqueous solution to gel, then extracting and removing the solvent to obtain a PVA resin film) and a combination of these methods. As another example of the production method, there may be mentioned a melt-extrusion film-forming method in which a melted PVA containing a solvent is used as a film-forming stock solution. Among them, the cast film-forming method and the melt-extrusion film-forming method are preferable, and the melt-extrusion film-forming method is more preferable because a resin film of PVA having high transparency and little coloring can be obtained.

In the present invention, the PVA resin film preferably contains 0.01 to 30% by weight of plasticizers such as glycerin and other polyols relative to the PVA in order to improve mechanical physical properties or smooth operation during secondary processing, and in order to improve handling It is preferable to contain 0.01 to 1% by weight of surfactants, such as anionic surfactants and nonionic surfactants, relative to PVA, in terms of properties or film appearance.

The PVA resin film may further contain optional components such as antioxidants, ultraviolet absorbers, slip agents, pH adjusters, inorganic fine particles, colorants, preservatives, fungicides, other polymers other than the above-mentioned components, and water. The PVA resin film may contain one or two or more of the aforementioned arbitrary components.

The thickness T of the PVA resin film is 45 μm or less, preferably 35 μm or less, more preferably 25 μm or less, more preferably 20 μm or less, and preferably 5 μm or more, preferably 10 μm or more, More than 15 μm is more preferable. When the thickness of the PVA resin film is not more than the upper limit of the above-mentioned range, the shrinkage force of the polarizing plate can be effectively reduced, and by being more than the lower limit of the above-mentioned range, a polarizing plate having sufficiently high polarizing performance can be obtained.

The retardation Re1 in the in-plane direction of the PVA resin film is 50 nm or less, preferably 40 nm or less, more preferably 30 nm or less, more preferably 20 nm or less, and preferably 0 nm or more, and 3 nm or less The above is preferred. When the retardation Re1 in the in-plane direction of the PVA resin film is not more than the upper limit of the above-mentioned range, the stacked body can be stretched at a sufficient magnification, and a polarizing plate with high polarizing performance can be obtained.

The shape and size of the PVA resin film may be appropriately adjusted to correspond to the intended use. In terms of manufacturing efficiency, the PVA resin film is preferably a strip-shaped film.

[Substrate film]

The substrate film is a layer body different from the PVA resin film, and is a film made of resin. In the present invention, the resin forming the base film is a flexible resin that can be stretched at a high stretch ratio (eg, 6.0 times) at a low temperature (eg, 50 to 120° C.). In the present invention, the resin (resin A) that forms the base film has a melt flow rate of 1 g/10 min or more and a tensile modulus E of 50 MPa or more and 1200 MPa or less, or contains specified A cycloolefin-based resin (resin B) of a cycloolefin-based polymer.

[Resin A]

In the present invention, the melt flow rate of the resin A forming the base film is 1 g/10 minutes or more, preferably 3 g/10 minutes or more, preferably 5 g/10 minutes or more, and 300 g/10 minutes or more. It is better to be less than 10 minutes, and it is better to be less than 100 g/10 minutes. The melt flow rate mentioned here is the value measured at 190°C under a load of 2.16 kg. Hereinafter, only the "melt flow rate measured at 190°C under a load of 2.16 kg" is referred to as "MFR". By making MFR of resin A more than the lower limit, retardation can be suppressed at the time of making a polarizing plate, and heat resistance can be improved by making MFR below the upper limit.

The MFR of resin A must be measured in accordance with JIS-K-7210 using a melt flow indexer (MELT INDEXER) at a temperature of 190°C and a load of 2.16 kg.

In the present invention, the tensile elastic modulus E of the resin A forming the base film is 50 MPa or more, preferably 100 MPa or more, preferably 200 MPa or more, and is 1200 MPa or less, and 1000 MPa or less. Better, preferably below 800 MPa. By making the tensile modulus E of resin A equal to or greater than the lower limit, the retardation of the base film can be reduced when stretching the stacked body to form a polarizing plate, and by making it equal to or less than the upper limit, it is possible to The occurrence of breakage of the substrate film is prevented when the stack is stretched.

The resin A forming the base film is not particularly limited as long as it is a resin with an MFR of 1 g/10 min or more and a tensile modulus E of 50 MPa or more and 1200 MPa or less. Such a resin is transparent From the point of view of excellent performance and water vapor barrier properties, cycloolefin-based resins containing cycloolefin-based polymers are preferable.

As the aforementioned cycloolefin-based polymer, a hydrogenated block copolymer obtained by hydrogenating a block copolymer [D] composed of a repeating compound derived from an aromatic vinyl compound is preferable. The polymer block [A] mainly composed of the unit [I], and the repeating unit [I] derived from an aromatic vinyl compound and the repeating unit [II] derived from a chain conjugated diene compound. The polymer block [B] or the polymer block [C] mainly consists of a repeating unit [II] derived from a chain-like conjugated diene compound. Examples of such hydrogenated block copolymers include: WO2000/32646, WO2001/081957, Japanese Patent Laid-Open No. 2002-105151, Japanese Patent Laid-Open No. 2006-195242, Japanese Patent Laid-Open No. 2011- Polymers described in Publication No. 13378, WO2015/002020, etc.

[resin B]

In the present invention, the resin B forming the base film is a cycloolefin-based resin containing a cycloolefin-based polymer. The cycloolefin-based polymer contained in the resin B is a hydrogenated block copolymer obtained by hydrogenating a block copolymer [D] composed of repeating compounds derived from aromatic vinyl compounds. The polymer block [A] mainly composed of the unit [I], and the repeating unit [I] derived from an aromatic vinyl compound and the repeating unit [II] derived from a chain conjugated diene compound. The polymer block [B] or the polymer block [C] mainly consists of a repeating unit [II] derived from a chain-like conjugated diene compound. As such a hydrogenated block copolymer, the same thing as "the hydrogenated block copolymer disclosed above can be suitably used as the resin A" can be used.

The resin B forming the base film may be a resin having an MFR of 1 g/10 min or more and a tensile modulus E of 50 MPa or more and 1200 MPa or less.

[Plasticizer and softener]

In the present invention, the resin (resin A and resin B) forming the base film preferably contains a plasticizer and/or a softener (either or both of the plasticizer and the softener). By containing a plasticizer and/or a softener, it is possible to reduce the retardation generated in the base film when stretching a stacked body to obtain a polarizing plate.

As plasticizers and softeners, resins that can be uniformly dissolved or even dispersed to form a base film can be used. Specific examples of plasticizers and softeners include ester-based plasticizers composed of polyhydric alcohols and monocarboxylic acids (hereinafter referred to as "polyol ester-based plasticizers"), and ester-based plasticizers composed of polyhydric carboxylic acids and monocarboxylic acids. Ester-based plasticizers made of monohydric alcohols (hereinafter referred to as "polycarboxylic acid ester-based plasticizers") and other ester-based plasticizers, as well as phosphate-based plasticizers, sugar-ester-based plasticizers, and other polymeric material softener.

Examples of the polyhydric alcohol that is a raw material of the ester-based plasticizer favorably used in the present invention are not particularly limited, but ethylene glycol, glycerin, and trimethylolpropane are preferable.

Examples of polyol ester plasticizers include ethylene glycol ester plasticizers, glycerin ester plasticizers, and other polyol ester plasticizers.

As an example of a polybasic carboxylate plasticizer, a dicarboxylate plasticizer and other polybasic carboxylate plasticizers are mentioned.

Examples of phosphate-based plasticizers include: alkyl phosphates such as triacetyl phosphate and tributyl phosphate; cycloalkyl phosphates such as tricyclopentyl phosphate and cyclohexyl phosphate; triphenyl phosphate Phosphate esters, tricresyl phosphate and other aryl phosphate esters.

As the sugar ester-based plasticizer, specifically, glucose pentaacetate, glucose pentapropionate, glucose pentabutyrate, sucrose octaacetate, sucrose octabenzoate, etc. are preferred, among which Sucrose octaacetate is preferred.

Specific examples of polymer softeners include aliphatic hydrocarbon polymers, alicyclic hydrocarbon polymers, polyethyl acrylate, polymethyl methacrylate, methyl methacrylate, and 2-hydroxymethacrylate. Acrylic polymers such as copolymers of ethyl esters, copolymers of methyl methacrylate and methyl acrylate with 2-hydroxyethyl methacrylate; polyvinyl isobutyl ether, poly-N-vinylhydropyrrolidone Ethylene-based polymers such as polystyrene, poly-4-hydroxystyrene and other styrene-based polymers; polybutylene succinate, polyethylene terephthalate, polyethylene naphthalate and other polyesters ; Polyethylene oxide, polypropylene oxide and other polyethers; polyamide, polyurethane, polyurea, etc.

Specific examples of aliphatic hydrocarbon polymers include low molecular weight products such as polyisobutene, polybutene, poly-4-methylpentene, poly-1-octene, ethylene-α-olefin copolymers, and their Hydrides; low molecular weight substances of polyisoprene, polyisoprene-butadiene copolymer, etc., and their hydrogenates, etc. From the viewpoint of easy uniform dissolution and even dispersion in the cycloolefin resin, the number average molecular weight of the aliphatic hydrocarbon polymer is preferably 300-5,000.

These polymer softeners may be homopolymers consisting of one type of repeating unit, or copolymers having multiple repeating structures. In addition, the above-mentioned polymers may be used in combination of two or more.

In the present invention, as the plasticizer and/or softener, one or more selected from ester plasticizers and aliphatic hydrocarbon polymers are selected from the viewpoint of excellent compatibility with the resin forming the substrate film. good.

The proportion of the plasticizer and/or softener (hereinafter also referred to as "plasticizer, etc.") in the base film is preferably 0.2 parts by weight or more, with respect to 100 parts by weight of the resin forming the base film, and at least It is preferably at least 0.5 parts by weight, more preferably at least 1.0 parts by weight, on the other hand, it is preferably at most 50 parts by weight, and more preferably at most 40 parts by weight. By setting the ratio of the plasticizer and the like within the above-mentioned range, the base film can be made to have sufficiently low phase difference development even through the production process of the polarizing plate including stretching.

[Organometallic compound]

In the present invention, the base film preferably contains an organometallic compound. By including the organometallic compound, it is possible to more effectively suppress the occurrence of peeling of the base film in the case of stretching the stack at a high stretching ratio (for example, wet stretching at a stretching ratio of 6.0).

The organometallic compound is a compound containing at least one of a chemical bond between a metal and carbon and a chemical bond between a metal and oxygen, and is a metal compound having an organic group. Examples of organometallic compounds include organosilicon compounds, organotitanium compounds, organoaluminum compounds, and organozirconium compounds. Among them, organosilicon compounds, organotitanium compounds, and organozirconium compounds are preferable, and organosilicon compounds are more preferable because of excellent reactivity with polyvinyl alcohol. Organometallic compounds can also be used alone or in combination of two or more.

Examples of organometallic compounds include organosilicon compounds represented by the following formula (1), but are not limited thereto. R ¹ _a Si(OR ² ) _3−a (1) (In formula (1), R ¹ and R ² are independently selected from hydrogen atom, halogen atom, hydrocarbon group with 1 to 10 carbon atoms, epoxy group, amino group, mercapto group, isocyanate group and organic group with 1 to 10 carbon atoms, a represents an integer of 0 to 3.)

In formula (1), if R ¹ is to be cited as a preferable example, epoxy group, amine group, mercapto group, isocyanate group, vinyl group, aryl group, acryl group, carbon number 1 to 8 Alkyl group, -CH ₂ OC _n H _{2n + 1} (n represents an integer from 1 to 4.), etc.

In addition, in the formula (1), as R ² , preferable examples include: a hydrogen atom, a vinyl group, an aryl group, an acryl group, an alkyl group having 1 to 8 carbon atoms, and -CH ₂ OC _n H _{2n + 1} (n represents an integer from 1 to 4.) etc.

Examples of organosilicon compounds include epoxy-based organosilicon compounds such as 3-glycidoxypropyltrimethoxysilane and 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, 3-Aminopropyltrimethoxysilane, N-2-(Aminoethyl)-3-Aminopropyltrimethoxysilane and other amine organosilicon compounds, isocyanuric acid (trimethoxysilyl Isocyanate-based organosilicon compounds such as propyl) ester, mercapto-based organosilicon compounds such as 3-mercaptopropyltrimethoxysilane, and isocyanate-based organosilicon compounds such as 3-isocyanatopropyltriethoxysilane.

Examples of organic titanium compounds include titanium alkoxides such as tetraisopropyl titanate, titanium chelate compounds such as titanium acetylacetonate, and titanium acyl oxides such as titanium isostearate.

Examples of organic zirconium compounds include zirconium alkoxides such as n-propyl zirconate, zirconium chelates such as zirconium tetraacetylacetonate, and zirconyl acyl oxides such as zirconium stearate.

Examples of the organoaluminum compound include aluminum alkoxides such as secondary butylalumina and aluminum chelates such as aluminum triacetylacetonate.

The ratio of the organometallic compound in the substrate film is preferably at least 0.005 parts by weight, preferably at least 0.01 parts by weight, and more preferably at least 0.03 parts by weight, relative to 100 parts by weight of the resin forming the substrate film. , On the other hand, it is preferably 1.0 parts by weight or less, more preferably 0.5 parts by weight or less. By setting the ratio of the organometallic compound within the aforementioned range, it is possible to more effectively suppress the occurrence of peeling of the base film in the case of wet stretching of the stacked body at a high magnification (for example, a stretching magnification of 6.0).

[optional ingredient]

The base film must contain other optional components in addition to resins, plasticizers, organometallic compounds, and the like. Examples of optional components include stabilizers such as antioxidants, ultraviolet absorbers, and light stabilizers; resin modifiers such as slip agents; colorants such as dyes and pigments; and antistatic agents. These admixtures can be used alone or in combination of two or more, and the blending amount can be appropriately selected within the range that does not impair the object of the present invention.

[Manufacturing method of substrate film]

The base film can be produced by forming a composition (hereinafter also referred to as "resin composition") containing the components (resin and optional components) used to form the base film into a film form by any molding method .

Examples of the method of molding the resin composition into a film include casting molding, extrusion molding, inflation molding, and the like.

The thickness of the substrate film is preferably not less than 1 μm, more preferably not less than 3 μm, and preferably not more than 50 μm, more preferably not more than 20 μm. By making the thickness of the base film more than the lower limit of the aforementioned range, it is possible to effectively prevent the melting of the polarizer in the polarizing process, and by being less than the upper limit of the aforementioned range, it is possible to reduce the thickness of the stretched stack. And the phase difference produced in the substrate film when obtaining the polarizing plate.

[Manufacturing method of stacked body]

FIG. 2 is a schematic diagram showing an example of a manufacturing device 200 for a stacked body related to this embodiment. The manufacturing apparatus 200 includes unwinding devices 201 & 202 , a bonding device 205 , and a winding device 203 .

As shown in Figure 2, the PVA resin film 11 unwound from the unwinding device 201 is transported to the bonding device 205, and the bonding agent is coated on the laminating device 205, and then combined with the base film 12 unwound from the unwinding device 202 bonded, whereby the stacked body 10 can be obtained. The manufactured stack 10 can be wound into a roll shape by the winding device 203 for further processing.

The adhesive 13 for laminating the PVA resin film 11 and the base film 12 is not particularly limited, for example: acrylic adhesives, urethane adhesives, polyester adhesives, polyvinyl alcohol adhesives, etc. Adhesives, polyolefin-based adhesives, modified polyolefin-based adhesives, polyvinyl alkyl ether-based adhesives, rubber-based adhesives, vinyl chloride-vinyl acetate-based adhesives, SEBS (styrene-ethylene-butylene ethylene-styrene copolymer) adhesives, ethylene-styrene copolymers and other vinyl adhesives, ethylene-(meth)acrylate copolymers, ethylene-(meth)acrylate copolymers, etc. Acrylic adhesive, etc. It is preferable to use an adhesive to more effectively suppress the occurrence of peeling between the PVA resin film 11 and the base film 12 when the laminate is wet-stretched at a high magnification (for example, a stretching magnification of 6.0).

Corona treatment, saponification treatment, primer treatment, anchor type Easy joining treatment such as coating treatment.

[stack]

In the present invention, Re2 is not less than 0 nm and not more than 20 nm. Re2 is preferably above 0 nm, preferably below 10 nm, and preferably below 5 nm. When Re2 is below an upper limit, the retardation which appears in a base film when stretching the laminated body 10 and making it into a polarizing plate can be made small.

Re2 means that the free end of the stack 10 is uniaxially extended to 6.0 times at a temperature of 50°C to 120°C, and when the base film in the stack is made into an extension, the extension of the base film has The phase difference in the in-plane direction. In other words, Re2 is not the phase difference of the base film itself in the stack, but the phase difference generated in the extension of the base film after a specific stretching process is applied to the stack.

The extension temperature used to obtain such an extension can be any temperature within the range of 50°C to 120°C. Thus, a number of operating conditions for obtaining extension of the extension can be envisioned. In the case where the extension exhibits a phase difference of not less than 0 nm and not more than 20 nm due to any one of such a plurality of operating conditions, the stacked body satisfies the aforementioned requirements.

However, it is preferable that "the extension will show a phase difference of more than 0 nm and less than 20 nm due to all the above-mentioned multiple operating conditions obtained." In this case, in the manufacture of the polarizing plate through the stacked body for polarizing plates of the present invention, a high degree of freedom in setting stretching conditions can be obtained.

Generally speaking, in this temperature range, a larger phase difference will appear when the stretching temperature is lower. Therefore, as long as both the "retardation of the stretched product made by stretching at 50°C" and "the retardation of the stretched product made by stretching at 120°C" are within the range of 0 nm or more and 20 nm or less, that is It is judged that the extension will exhibit a phase difference of not less than 0 nm and not more than 20 nm due to all the aforementioned multiple operating conditions.

The stacked body 10 of the present invention is a material used to manufacture polarizers. The stacked body is made into a polarizing plate after being subjected to specified treatments such as stretching treatment and dyeing treatment. The polarizing plate of the present invention manufactured using the stacked body 10 of the present embodiment will be described below.

[2. Polarizing plate]

The polarizing plate 100 of the present invention is obtained by uniaxially stretching the stacked body 10 of this embodiment. FIG. 3 is a schematic cross-sectional view of a polarizer 100 manufactured by using the stacked body 10 related to this embodiment.

As shown in FIG. 3 , in the polarizing plate 100 , a base film 112 is stacked on one side (upper side as shown) of the PVA resin film 111 . In FIG. 3, 113 is an adhesive layer.

[Manufacturing method of polarizing plate]

A method of manufacturing a polarizing plate using the stacked plates according to Embodiment 1 of the present invention will now be described. FIG. 4 is a schematic diagram showing an example of a manufacturing device 300 for manufacturing a polarizing plate 100 using the stacked body 10 related to this embodiment.

As shown in FIG. 4 , the manufacturing apparatus 300 includes unwinding apparatuses 301 & 307 , processing apparatuses 302 to 305 , drying apparatuses 306 & 309 , bonding apparatus 308 , and winding apparatus 310 .

The manufacturing method of the polarizing plate of this invention includes the process (stretch process process) of uniaxially stretching the stacked body of this invention. The manufacturing method of the polarizing plate of this invention may also include the dyeing process of dyeing a stacked body, and/or the drying process of drying a stacked body. In this embodiment, the stacked body 10 unwound from the unwinding device 301 is conveyed to the processing devices 302 to 305, and the dyeing process (dyeing treatment process) of dyeing the PVA resin film of the stacked body is carried out, and the stacked body is uniaxially Extended extended processing (extended processing process), and specified processing. The polarizing plate 100 can be obtained by performing the treatment (drying process) of “drying the stacked body after these treatments in the drying device 306 ”. Each step will be described in detail below.

[Extended processing process]

In this embodiment, the stretching treatment step is a step of uniaxially stretching the stacked body. The method for stretching the stack is not particularly limited, but wet stretching is preferable. The stretching step may be performed once or twice or more.

The elongation ratio of the stacked body is preferably above 5.0, more preferably above 5.5, preferably below 7.0, preferably below 6.5. If the stretching ratio of the stacked body is set below the upper limit of the aforementioned range, even after the production process of the polarizing plate including stretching treatment, the appearance of the retardation of the base film can be reduced, and the occurrence of cracking of the polarizing plate can be prevented. A polarizing plate having sufficient polarizing performance can be obtained if the elongation ratio is set to be more than the lower limit of the aforementioned range. When stretching the stacked body two or more times, it is preferable that the total stretching ratio represented by the product of the stretching ratios of the respective times falls within the aforementioned range as much as possible.

The stretching temperature of the stack is not particularly limited, but it is preferably above 30°C, preferably above 40°C, especially above 50°C, preferably below 140°C, and preferably below 90°C. Best, preferably below 70°C. Stretching can be smoothly performed by the stretching temperature being not less than the lower limit value of the aforementioned range, and effective orientation by stretching can be performed by being not more than the upper limit value of the aforementioned range. The range of the above-mentioned stretching temperature is suitable for any method of dry stretching or wet stretching, but is especially preferable for wet stretching.

The stretching treatment of the stack may be any of the following: longitudinal stretching treatment for stretching along the long side direction of the film, transverse stretching treatment for stretching along the width direction of the film, stretching treatment along the direction neither parallel nor perpendicular to the film width Diagonal stretch processing that stretches diagonally. The stretching process of the stack is preferably uniaxially stretched at the free end, and more preferably uniaxially stretched at the free end in the longitudinal direction.

[Dyeing treatment process]

The dyeing treatment step is a step of dyeing the PVA resin film of the laminate. In this embodiment, the manufacturing method of the polarizing plate includes a dyeing treatment (step) of dyeing the PVA resin film of the laminate, but in the present invention, the dyeing treatment is optional and may not be included. The dyeing treatment process can also be performed before the stretching treatment. In addition, the dyeing of the PVA resin film can also be performed on the PVA resin film before forming the laminated body.

Examples of the substance that dyes the PVA resin film in the dyeing treatment step include dichroic substances, and examples of the dichroic substance include iodine, organic dyes, and the like. The dyeing method using these dichroic substances is arbitrary. For example, dyeing can also be performed by dipping a layer body of a PVA resin film with a dyeing solution containing a dichroic substance. Furthermore, when using iodine as a dichroic substance, the dyeing solution may contain iodides, such as potassium iodide, from a viewpoint of improving dyeing efficiency. The dichroic substance is not particularly limited, but when the polarizing plate is used in a vehicle-mounted display device, an organic dye is preferable as the dichroic substance.

[Drying process]

The drying step is a step of drying the stacked body that has undergone treatment steps such as the dyeing treatment step and the stretching treatment step. In the drying step, it is preferable to dry the stack after the treatment step in a dryer at a temperature of 50° C. to 100° C. for 0.5 minutes to 10 minutes. The drying temperature of the aforementioned stacked body is preferably above 60°C, and preferably below 90°C. The drying time can be shortened by setting the drying temperature above the lower limit, and the breakage of the PVA resin film can be prevented by setting the drying temperature below the upper limit. The drying time of the stacked body is preferably more than 1 minute, and more preferably less than 5 minutes. By setting the drying time to be more than the lower limit, the above-mentioned stack can be sufficiently dried, and by setting the drying time to be below the upper limit, it is possible to prevent the cracking of the PVA resin film in the stack.

In conventional polarizers made of only PVA resin films, cracks may occur after the drying process. However, the polarizers of this embodiment are produced using a stack of PVA resin films and substrate films. , so cracking of the polarizer can be suppressed even after the drying process.

[Characteristics of each layer in the polarizing plate]

The thickness of the PVA resin film in the polarizing plate is preferably below 20 μm, preferably below 10 μm, preferably above 3 μm, preferably above 5 μm. When the thickness is not more than the upper limit, the thickness of the polarizing plate can be reduced, and when the thickness is not less than the lower limit, a polarizing plate having sufficiently high polarization performance can be obtained.

The retardation in the in-plane direction of the substrate film in the polarizing plate is preferably 20 nm or less, more preferably 15 nm or less, more preferably 10 nm or less, and preferably 0 nm or more. When the phase difference in the in-plane direction of the base film in the polarizing plate is within the above-mentioned range, black shift can be suppressed when the polarizing plate is mounted on a liquid crystal display device.

[3. Functions and effects of this form of implementation]

In this embodiment, since it is based on the combination of "a PVA resin film with a small retardation Re1 in the in-plane direction and a small thickness" and "a resin with flexibility that can be stretched at a low temperature at a high magnification" "PVA resin film" stack is stretched to produce a polarizing plate, so even when the stack is stretched at a high magnification at a low temperature, the occurrence of melting of the PVA resin film can be suppressed, and the phase in the stretched base film can be suppressed Poor appearance. As a result, according to this embodiment, it can be directly used as a protective film on one side of the PVA resin film without peeling off the base film, and wasteful materials can be reduced, so it is possible to provide "even if the base film is used as a protective film A method of manufacturing a polarizing plate that can still be used and can be efficiently manufactured even if it is thin.

[Modification 1]

Referring to FIG. 4 and FIG. 5 , the polarizing plate 120 of Modification 1 manufactured by using the stacked body 10 related to Embodiment 1 of the present invention will be described simultaneously.

FIG. 5 is a schematic cross-sectional view of a polarizing plate 120 of Modification 1 manufactured by using the stacked body 10 related to the embodiment of the present invention. In this polarizing plate 120, as shown in FIG. 5 , a substrate film 112 is stacked on one side (upper side as shown) of the PVA resin film 111, and a substrate film 112 is stacked on the other side of the PVA resin film 111 (the upper side as shown). The lower side) is stacked with a protective film 115 . In FIG. 5 , 113 and 114 are adhesive layers. The adhesive for bonding the protective film 115 to the PVA resin film may be the same as the adhesive for bonding the base film to the PVA resin film.

The manufacturing method of the polarizing plate 120 related to this example includes the process of attaching the protective film 115 directly or through an adhesive to the PVA resin film 111 of the polarizing plate 100 obtained in Embodiment 1.

Specifically, as shown in FIG. 4, the polarizing plate 100 of Embodiment 1 is transported to the bonding device 308, and then the adhesive 114 is applied to the surface of the PVA resin film 111 on the side where the base film 112 is not stacked, and the self-rolling The protective film 115 unwound by the delivery device 307 is bonded together, thereby obtaining the polarizing plate 120 provided with the protective film 115 . The manufactured polarizing plate 120 can be wound up by the winding device 310 into a roll shape for further processing.

In this example, as the protective film 115, a film made of one or more resins selected from cycloolefin resins, acrylic resins, polyethylene terephthalate resins, and triacetyl cellulose resins can be used.

The polarizing plate of this example is the same as the polarizing plate of Embodiment 1 by including "a PVA resin film with a small retardation Re1 in the in-plane direction and a small thickness" and "a soft film capable of high-magnification stretching at low temperature." The stacked body of the "base film" made of a permanent resin is stretched to manufacture a polarizing plate, so it has the same function and effect as that of Embodiment 1.

Moreover, according to this example, the surface of the PVA resin film 111 on the side where the base film 112 is not stacked has the protective film 115, so it also has the effect of preventing scratches and the like from being left on the surface of the PVA resin film 111.

[Modification 2]

Hereinafter, referring to FIG. 6 , a polarizing plate 130 of Modification 2 manufactured by using the stacked body 10 related to Embodiment 1 of the present invention will be described.

FIG. 6 is a schematic cross-sectional view showing a polarizing plate of Modification 2 manufactured by using the stacked body 10 related to Embodiment 1 of the present invention.

FIG. 6 is a schematic cross-sectional view of the polarizer 130 of this example. In this polarizing plate 130, as shown in FIG. 6, a substrate film 112 is stacked on one side (upper side as shown) of the PVA resin film 111, and a substrate film 112 is stacked on the other side of the PVA resin film 111 (the upper side as shown). The lower side) is stacked with an adhesive layer 116 .

The manufacturing method of the polarizing plate 130 related to this example includes the step of providing the adhesive layer 116 on the PVA resin film 111 of the polarizing plate 100 obtained in the first embodiment.

As the adhesive for forming the adhesive layer 116 , various commercially available adhesives can be used, for example, an adhesive containing acrylic polymer as a main component of a polymer.

The polarizing plate 130 of this example, for example, can be obtained by transferring the adhesive layer from a commercially available film with an adhesive layer (for example, "MASTACK series" manufactured by Fujimori Industries) to the PVA of the polarizing plate 100 of Embodiment 1. The surface of the resin film 111 on which the base film 112 is not stacked is obtained by forming an adhesive layer.

The polarizing plate 130 of this example is also the same as the polarizing plate of Embodiment 1, by combining "a PVA resin film with a small retardation Re1 in the in-plane direction and a small thickness" and "a film made of a film capable of high-magnification stretching at low temperature." The stacked body of the flexible resin "base film" is stretched to produce a polarizing plate, so it has the same function and effect as that of Embodiment 1.

Furthermore, according to this example, the adhesive layer 116 is provided on the surface of the PVA resin film 111 on the side where the base film 112 is not stacked, so it also has the effect of preventing scratches and the like on the surface of the PVA resin film 111 .

[Example 2: Stacked body for polarizing plates and polarizing plates]

Referring to FIG. 7 and FIG. 8, a stacked body 15 (stacked body for polarizing plates) of Embodiment 2 of an embodiment of the present invention, and a polarizing plate 150 manufactured using the stacked body 15 and its manufacturing method will be described simultaneously. . The same symbols are attached to the same structures and aspects as those of Embodiment 1, and repeated explanations are omitted.

7 is a schematic cross-sectional view of a stack 15 related to Embodiment 2 of the present invention, and FIG. 8 is a schematic cross-sectional view of a polarizer 150 manufactured using the stack 15 related to this embodiment.

[stack]

The stacked body 15 of this embodiment is different from the stacked body of Embodiment 1 in that the base film 12 is directly stacked on the PVA resin film 11 .

As a method of directly stacking the base film 12 on the PVA resin film 11, methods such as thermal fusion, ultrasonic fusion, and laser fusion can be mentioned, for example. In this application, the so-called "direct stacking" of the base film on the surface of the PVA resin film includes the case where the PVA resin film and the base film are prepared separately and bonded in direct contact without intervening other layers. .

The stacked body 15 of this embodiment is also the same as the stacked body 10 of Embodiment 1, and can be used as a material for manufacturing polarizing plates.

[Polarizer]

The polarizing plate 150 of the present invention manufactured using the stacked body 15 of this embodiment will be described below. The polarizer 150 can be obtained by uniaxially stretching the stacked body 10 of this embodiment.

As shown in FIG. 8 , in the polarizing plate 150 , a base film 112 is directly stacked on one side (upper side as shown) of the PVA resin film 111 . The polarizing plate 150 of this embodiment can also be manufactured by the same method as the polarizing plate 100 of the first embodiment.

[Effects of this form of implementation]

In this embodiment, it is also the same as the polarizing plate of Embodiment 1, by including "a PVA resin film with a small retardation Re1 in the in-plane direction and a small thickness" and "a PVA resin film capable of high-magnification stretching at low temperature." The polarizing plate 150 is produced by stretching the stacked body of the "base film" made of flexible resin, so it has the same function and effect as that of Embodiment 1.

And, according to this embodiment mode, since the stacked body of the base film 12 is directly stacked on the PVA resin film 11 is used, the fracture suppression effect is excellent, and it also prevents environmental pollution caused by other substances in the production environment, or Prevents the effect of blemishes (incorporation of foreign matter) on the product.

[Modification 3]

Referring to FIG. 9 , a polarizing plate 160 according to Modification 3 manufactured by using the stacked body 15 related to Embodiment 2 of the present invention will be described below. FIG. 9 is a schematic cross-sectional view of a polarizing plate 160 of Modification 3 manufactured by using the stacked body related to Embodiment 2 of the present invention.

In the polarizing plate 160, as shown in FIG. 9 , a base film 112 is stacked on one side (the upper side of the figure) of the PVA resin film 111, and a substrate film 112 is stacked on the other side of the PVA resin film 111 (the lower side of the figure). side) with the adhesive layer 114 interposed and the protective film 115 stacked. As the adhesive 114 for bonding the protective film 115 to the PVA resin film 111, the same adhesive as the bonding agent for bonding the PVA resin film to the base film described in Embodiment 1 can be used.

The manufacturing method of the polarizing plate 160 related to this example includes the process of bonding the protective film 115 to the PVA resin film 111 of the polarizing plate 150 obtained in Embodiment 2 through an adhesive. The protective film 115 and the method of attaching the protective film are the same as those of Modification 1.

The polarizing plate 160 of this example is also the same as the polarizing plate of Embodiment 1, by combining "a PVA resin film with a small retardation Re1 in the in-plane direction and a small thickness" and "a PVA resin film capable of high-magnification stretching at low temperature." The stacked body of the flexible resin "base film" is stretched to produce a polarizing plate, so it has the same function and effect as that of Embodiment 1.

And, according to this example, since the base film 12 is directly stacked to the stacked body 15 of the PVA resin film 11, the fracture suppression effect is excellent, and it also prevents environmental pollution caused by other substances in the production environment, or prevents The effect on the blemish (contamination of foreign matter) of the product.

Moreover, according to this example, the surface of the PVA resin film 111 on the side where the base film 112 is not stacked has the protective film 115, so it also has the effect of preventing scratches etc. from being left on the surface of the PVA resin film 111.

[Modification 4]

Referring to FIG. 10 , a polarizing plate 170 according to Modification 4 manufactured by using the stacked body 15 related to Embodiment 2 of the present invention will be described. FIG. 10 is a schematic cross-sectional view of a polarizing plate 170 of Modification 4 manufactured by using the stacked body related to Embodiment 2 of the present invention.

In the polarizing plate 170, as shown in FIG. 10 , a substrate film 112 is stacked on one side (upper side of the figure) of the PVA resin film 111, and a substrate film 112 is stacked on the other side (lower side of the figure) of the PVA resin film 111. side) is stacked with an adhesive layer 116 .

The manufacturing method of the polarizing plate 170 related to this example includes the step of providing the adhesive layer 116 on the PVA resin film 111 of the polarizing plate 150 obtained in the second embodiment.

The method of forming the adhesive layer 116 and the adhesive used for forming the adhesive layer 116 are the same as those of Modification 2.

The polarizing plate 170 of this example is also the same as the polarizing plate of Embodiment 1. It is made by combining "a PVA resin film with a small retardation Re1 in the in-plane direction and a small thickness" and "a PVA resin film capable of high-magnification stretching at low temperature." The stacked body of the flexible resin "base film" is stretched to produce a polarizing plate, so it has the same function and effect as that of Embodiment 1.

And, according to this example, since the base film 12 is directly stacked to the stacked body 15 of the PVA resin film 11, the fracture suppression effect is excellent, and it also prevents environmental pollution caused by other substances in the production environment, or prevents The effect of contamination (mixing of foreign matter) on the product.

Furthermore, according to this example, the adhesive layer 116 is provided on the side of the PVA resin film 111 on which the base film 112 is not stacked, so it also has the effect of preventing scratches on the surface of the PVA resin film 111 .

[Implementation type 3: Display device]

The polarizing plate manufactured using the stacked body for polarizing plates of the present invention can be used as a material for a liquid crystal display device.

Usually, a liquid crystal display device sequentially includes a light source, a light source-side polarizing plate, a liquid crystal cell, and a viewing-side polarizing plate, but the polarizing plate obtained through the present invention can be used for either the light source-side polarizing plate or the viewing-side polarizing plate. .

Examples of driving methods for liquid crystal cells include in-plane switching (IPS) mode, vertical alignment (VA) mode, multi-area vertical alignment (MVA) mode, continuous pyrotechnic alignment (CPA) mode, and hybrid alignment nematic (HAN) mode. mode, twisted nematic (TN) mode, super twisted nematic (STN) mode, optically compensated birefringence (OCB) mode, etc.

A display device 400 related to Embodiment 3 including "the polarizing plate 100 manufactured using the stacked body 10 of the present invention" will be described below with reference to FIG. 11 . The display device 400 of the present embodiment is manufactured by using the polarizing plate 100 of the first embodiment as the light source side polarizing plate and the viewing side polarizing plate, and stacking them on the liquid crystal panel respectively.

FIG. 11 is a schematic cross-sectional view of a display device 400 related to Embodiment 3 of the present invention. As shown in FIG. 11 , the display device 400 has two substrates 410 & 420 , a liquid crystal layer 430 located therebetween, and polarizers 100 & 100 arranged outside the two substrates 410 & 420 respectively. The two polarizers 100 are stacked using Embodiment 1 The polarizer 100 manufactured by the body 10. As shown in FIG. 11 , two polarizers 100 are stacked in such a way that the base film 112 of the polarizer is arranged between the PVA resin film 111 of the polarizer and the liquid crystal layer 430 .

According to this embodiment, it is possible to provide a display device including "a polarizing plate that can be used even if the base film is used as a protective film, and that can be efficiently manufactured even if it is thin".

[Implementation type 4: Display device]

Referring now to FIG. 12 , a display device 450 related to Embodiment 4 including a polarizing plate of the present invention will be described. The display device 450 of this embodiment is manufactured by using the polarizing plate of the present invention as one of the light source side polarizing plate and the viewing side polarizing plate, and stacking the polarizing plate on the liquid crystal panel.

FIG. 12 is a schematic cross-sectional view of a display device 450 related to Embodiment 4 of the present invention. As shown in FIG. 12 , the display device 450 has two substrates 410 & 420 , a liquid crystal layer 430 located therebetween, and a polarizer 120 arranged on the "outer surface of the lower substrate 410 (lower side in the figure)". The polarizing plate 120 is the polarizing plate of Modification 1. As shown in FIG. 12 , the polarizing plate 120 is stacked in such a way that the base film 112 of the polarizing plate is arranged between the PVA resin film 111 of the polarizing plate and the liquid crystal layer 430 .

According to this embodiment, it is possible to provide a method of manufacturing a display device including "the polarizing plate of the present invention that can be used even if the base film is used as a protective film, and can be efficiently manufactured even if it is thin".

[Implementation Type 5: Display Device]

Referring now to FIG. 13 , a display device 460 related to Embodiment 5 including a polarizing plate 160 of the present invention will be described. The display device 460 of this embodiment is manufactured by using the polarizing plate of the present invention as one of the light source side polarizing plate and the viewing side polarizing plate, and stacking the polarizing plate on the liquid crystal panel.

FIG. 13 is a schematic cross-sectional view of a display device 460 related to Embodiment 5 of the present invention. As shown in FIG. 13 , the display device 460 has two substrates 410 & 420 , a liquid crystal layer 430 located therebetween, and a polarizer 160 arranged on the "outer surface of the lower substrate 410 (lower side in the figure)". The polarizing plate 160 is the polarizing plate of the third modification. As shown in FIG. 13 , the polarizer 160 is stacked in such a way that the base film 112 of the polarizer is arranged between the PVA resin film 111 of the polarizer and the liquid crystal layer 430 .

According to this embodiment, it is possible to provide a method of manufacturing a display device including "the polarizing plate of the present invention that can be used even if the base film is used as a protective film, and can be efficiently manufactured even if it is thin".

[Implementation Type 6: Display Device]

A polarizing plate manufactured using the polarizing plate stack of the present invention can be used as a material for an EL display device.

Generally, an organic EL display device includes a substrate, a transparent electrode, a light-emitting layer, and a metal electrode layer sequentially from the light exit side, but the polarizer obtained by the manufacturing method of the present invention can be arranged on the light exit side of the substrate.

The EL display device has two substrates, a light-emitting layer located therebetween, and a polarizing plate disposed outside one of the two substrates. The display device can be manufactured by stacking the polarizing plate of the present invention on an organic EL panel or an inorganic EL panel.

Hereinafter, a display device 500 related to Embodiment 6 including "a polarizing plate manufactured using the stacked body for polarizing plates of the present invention" will be described with reference to FIG. 14 . The display device 500 of this embodiment is manufactured by stacking the polarizing plate 100 of the present invention on an organic EL panel.

FIG. 14 is a schematic cross-sectional view of a display device 500 related to Embodiment 6 of the present invention. The display device 500 has two substrates 510 & 520 , a light-emitting layer 530 located therebetween, and a polarizing plate 100 arranged on the "outer surface of the lower substrate 510 (lower side in the figure)". The polarizing plate 100 is the polarizing plate of the first embodiment. As shown in FIG. 14 , the polarizing plate 100 is stacked in such a way that the base film 112 of the polarizing plate 100 is disposed between the PVA resin film 111 of the polarizing plate 100 and the light emitting layer 530 .

According to this embodiment, it is possible to provide a display device including "the polarizing plate of the present invention which can be used even if the base film is used as a protective film, and which can be efficiently manufactured even if it is thin".

[Implementation Type 7: Display Device]

Referring now to FIG. 15 , a display device 550 related to Embodiment 7 equipped with "a polarizing plate manufactured using the stacked body of the present invention" will be described. The display device 550 of this embodiment is manufactured by stacking the polarizing plate 120 of the present invention on an organic EL panel.

FIG. 15 is a schematic cross-sectional view of a display device 550 related to Embodiment 7 of the present invention. The display device 550 has two substrates 510 & 520 , a light-emitting layer 530 located therebetween, and a polarizing plate 120 arranged on the "outer surface of the lower substrate 510 (lower side in the figure)". The polarizing plate 120 is the polarizing plate of Modification 1. As shown in FIG. 15 , the polarizer 120 is stacked in such a way that the base film 112 of the polarizer 120 is disposed between the PVA resin film 111 of the polarizer 120 and the light emitting layer 530 .

According to this embodiment, it is possible to provide a display device including "the polarizing plate of the present invention which can be used even if the base film is used as a protective film, and which can be efficiently manufactured even if it is thin".

[Implementation Type 8: Display Device]

Referring now to FIG. 16 , a display device 560 related to Embodiment 8 equipped with "a polarizing plate manufactured using the stacked body of the present invention" will be described. The display device 560 of this embodiment is manufactured by stacking the polarizing plate 160 of the present invention on an organic EL panel.

FIG. 16 is a schematic cross-sectional view of a display device 560 related to Embodiment 8 of the present invention. The display device 560 has two substrates 510 & 520 , a light-emitting layer 530 located therebetween, and a polarizing plate 160 arranged on the "outer surface of the lower substrate 510 (lower side in the figure)". The polarizing plate 160 is the polarizing plate of the third modification. As shown in FIG. 16 , the polarizer 160 is stacked in such a way that the base film 112 of the polarizer 160 is disposed between the PVA resin film 111 of the polarizer 160 and the light emitting layer 530 .

According to this embodiment, it is possible to provide a display device including "the polarizing plate of the present invention which can be used even if the base film is used as a protective film, and which can be efficiently manufactured even if it is thin".

[Other Implementation Types]

(1) Although Embodiment 3 discloses that the polarizing plate of Embodiment 1 is used for the light source side polarizing plate and the viewing side polarizing plate respectively, other polarizing plates can be used to form any one of them, and it is also possible to use Two polarizing plates of Embodiment 2 or polarizing plates of Modifications 1 to 4.

(2) Although the polarizing plate of Modification 1 and the polarizing plate of Modification 3 are used in either of the light source side polarizing plate and the viewing side polarizing plate in Embodiments 4 and 5, Embodiment 1 can also be used . The polarizing plate of Embodiment 2, Modification 2 or Modification 4.

(3) Embodiments 6 to 8 disclose examples in which the polarizing plate of Embodiment 1, the polarizing plate of Modification 1, and the polarizing plate of Modification 3 are respectively used in organic EL display devices, but they are not limited to this . For example, the polarizing plate of Embodiment 2, the polarizing plate of Modification 2, or the polarizing plate of Modification 4 can be used, and the polarizing plate of the present invention can also be used in an inorganic EL display device.

"Example"

The present invention will be described in further detail below with reference to examples and comparative examples, but the present invention is not limited by the following examples. The following "parts" and "%" in the quantitative ratio of ingredients represent parts by weight unless otherwise noted.

[Evaluation method]

[Weight average molecular weight (Mw) and molecular weight distribution (Mw/Mn)]

The molecular weights of block copolymers and block copolymer hydrogenated products are measured at 38° C. as standard polystyrene conversion values of GPC using THF as an eluent. HLC8020GPC manufactured by TOSOH was used as a measuring device.

[Hydrogenation rate]

The hydrogenation rate of the hydrogenated block copolymer was calculated by ¹ H-NMR spectrum or GPC analysis. The area where the hydrogenation rate is less than 99% is calculated by measuring ¹ H-NMR spectrum, and the area where the hydrogenation rate exceeds 99% is calculated from the ratio of the peak areas of the UV detector and the RI detector by GPC analysis.

[Measurement of MFR (melt flow rate measured at 190°C under a load of 2.16 kg)]

The melt flow rate is in accordance with JIS K7210, using an extrusion-type plastic meter (manufactured by Tateyama Scientific Industry Co., Ltd., trade name "MELT INDEXER (L240)") as a measuring device, measured under the conditions of a temperature of 190°C and a load of 2.16 kg Measurement.

[Measurement of tensile modulus of elasticity]

The tensile elastic modulus was measured in accordance with JIS K7127 using a tensile testing machine (manufactured by Instron Japan Company, Ltd., trade name "Electric Universal Testing Machine (5564)") by the following method.

The base film was punched into the shape of the test piece type 1B described in JIS K7127, and the stress when the test piece was stretched in the longitudinal direction and deformed was measured. The stress measurement conditions were set at a temperature of 23°C, a humidity of 60±5%RH, a chuck distance of 115 mm, and a tensile speed of 50 mm/min. The measurement of stress was carried out 5 times. From the measured stress and the measured data of the strain corresponding to this stress, select 4 items of measured data with an interval of 0.2% within the range of the strain of the test piece from 0.6% to 1.2% (that is, the strain is 0.6 %, 0.8%, 1.0% and 1.2% of the measurement data), and use the least square method to calculate the tensile elastic modulus from the 4 measurement data (20 items in total) of the 5 measurements.

[Measurement method of phase difference]

The retardation Re1 in the in-plane direction of the polyvinyl alcohol resin film, the retardation Re2 in the in-plane direction of the extension of the substrate film, and the retardation in the in-plane direction of the substrate film in the polarizing plate are measured using a retardation meter (manufactured by OPTO SCIENCE Co., Ltd., trade name "Mueller matrix polarimeter (Axo Scan)") measurement. When measuring, the measurement wavelength is set at 550 nm.

As long as "the phase difference in the in-plane direction of the substrate film produced when the free end of the stack is uniaxially stretched to 6.0 times at a temperature of 50°C" and "the free end of the stack is monoaxially stretched at a temperature of 120°C The retardation in the in-plane direction of the base film produced when the axis is extended to 6.0 times" is in the range of 0 nm or more and 20 nm or less, then it is judged that "the stacked body is stacked under the temperature condition of 50°C to 120°C When the free end is uniaxially stretched to 6.0 times, the retardation Re2" of the substrate film in the in-plane direction is not less than 0 nm and not more than 20 nm.

[measurement method of thickness]

The thickness of each film (polyvinyl alcohol resin film and base film) contained in the stack and the thickness of each film contained in the polarizing plate were obtained by using a thickness gauge (manufactured by Mitutoyo Corporation, trade name "ABS Digital Thickness Gauge ( 547-401)") Measure 5 times, and take the average value as the thickness of each film.

[evaluation of adhesiveness]

In the steps from the production of the polarizing plate of each example to the second stretching treatment, the case where no peeling occurred between the polyvinyl alcohol resin film and the base film was designated as A, and the case where a part of peeling was observed was designated as B, And the person who completely peeled off was designated as C.

[Evaluation of Drying Processability]

In the drying process at 70°C for 5 minutes in the production of the polarizing plate of each example, the case where no cracks occurred in the polarizer was rated as A, and the case where cracks occurred was rated as C.

[Black offset]

The liquid crystal display panel was removed from the liquid crystal display device (manufactured by LG Electronics Japan, Inc., trade name "IPS panel display (23MP47)"), the polarizing plate placed on the viewing side was peeled off, and the base film was placed on the panel side The polarizing plates produced in Examples and Comparative Examples were bonded together. In addition, a single polarizer without a protective film was pasted next to the polarizers produced in Examples and Comparative Examples to reassemble the liquid crystal display device. The absorption axis of "the polarizing plates produced in Examples and Comparative Examples, and a single polarizer without a protective film" was bonded in the same direction as the absorption axis of the polarizing plate before peeling off.

When the direction of the absorption axis of the polarizing plate arranged on the viewing side is set as the azimuth angle of 0°, and the vertical direction of the panel is set as the polar angle of 0°, the panel is set to a black display state (that is, the entire surface of the panel The state where the display screen shows black), and visually inspected from the azimuth angle of 45° and the polar angle of 45°, the case where the color tone change is the same as that of the polarizer without protective film is judged as A, and the case with a slight color change is judged as B, judge the one with the largest change as C.

[Example 1]

(1-1) Production of Polymer X

Referring to the production example described in Japanese Patent Publication No. 2002-105151, after polymerizing 25 parts of styrene monomer in the first stage, 30 parts of styrene monomer and 25 parts of isoprene monomer were polymerized in the second stage After polymerization, 20 parts of styrene monomers were polymerized in the third step to obtain a block copolymer [D1], and the block copolymer was hydrogenated to synthesize a hydrogenated block copolymer [E1]. The hydrogenated block copolymer [E1] has a Mw of 84,500, a Mw/Mn of 1.20, and a hydrogenation rate of the main chain and aromatic ring of almost 100%.

In 100 parts of hydrogenated block copolymer [E1], melt-knead 4{3-[3,5-bis(tertiary butyl)-4-hydroxyphenyl]propionic acid} neopentylthritol ester (Matsubara Sangyo Co., Ltd., product name "Songnox 1010") 0.1 part was blended as an antioxidant, and pelletized to obtain Polymer X for molding.

(1-2) Manufacture of base film

After dissolving the polymer X produced in (1-1) in cyclohexane, 40 parts by weight of polyisobutylene (manufactured by JX Nippon Oil & Energy Co., Ltd. ene HV-300", number average molecular weight 1,400) and 0.1 parts by weight of an organosilicon compound (3-aminopropyltriethoxysilane, KBM903, manufactured by Shin-Etsu Chemical Co., Ltd.) to prepare a coating solution for casting and film formation.

The obtained coating liquid for film formation was applied to a separator (manufactured by Mitsubishi Chemical Corporation, "MRV38") using a die coater, and dried. Thereby, a strip substrate film comprising polymer X with a width of 650 mm, a length of 500 m, and a thickness of 10 μm was obtained. The MFR of the base film was 10 g/10 minutes, and the tensile elastic modulus was 600 MPa.

(1-3) Manufacture of stacked body

Mix 100 parts by weight of water, 3 parts by weight of a polyvinyl alcohol-based adhesive ("Z-200" manufactured by Nippon Synthetic Chemicals Co., Ltd.), and 0.3 parts by weight of a crosslinking agent ("SPM-01" manufactured by Nippon Synthetic Chemicals Co., Ltd.) to obtain a joint. agent. Apply this adhesive to one side of the substrate film produced in (1-2), and the unstretched polyvinyl alcohol resin film (average degree of polymerization is about 2400, degree of saponification 99.9 mole%, width 650 mm, 20 μm thick, hereinafter also referred to as "PVA20") bonding. In this state, the bonding agent was heated and dried at 70° C. for 5 minutes to obtain a stacked body.

The thickness of the base film, the thickness of the polyvinyl alcohol resin film, and the phase difference Re1 in the in-plane direction and the phase difference Re2 in the obtained stack were measured. The results are shown in Table 1. The temperature conditions for the aforementioned free-end uniaxial stretching were set at 50°C and 120°C.

(1-4) Manufacture of polarizing plate

The following operations were carried out while continuously conveying the guide roller in the stack produced in (1-3) in the longitudinal direction.

Swelling treatment of immersing in water, dyeing treatment of immersing in a dyeing solution containing iodine and potassium iodide, and first stretching treatment of extending the dyed stack are performed on the aforementioned stack. Subsequently, the stack after the first stretching process was subjected to a second stretching process of stretching in a bath containing boric acid and potassium iodide. The total stretching ratio represented by the product of the stretching ratio in the first stretching treatment and the stretching ratio in the second stretching treatment was set so that it was 6.0. The stack after the second stretching treatment was dried in a dryer at 70° C. for 5 minutes (drying process) to obtain a polarizing plate.

The evaluation of adhesiveness was performed in the process up to the 2nd stretching process, the evaluation of drying processability was performed in a drying process, and the evaluation of black shift was performed about the obtained polarizing plate. The evaluation results are disclosed in Table 1.

And, the thickness and retardation of the base film in the obtained polarizing plate, and the thickness of the polyvinyl alcohol resin film were measured. The measurement results are disclosed in Table 1.

[Example 2]

Except that 0.1 parts by weight of organotitanium compound (tetraisopropyl titanate, ORGATIX TA-8, manufactured by Matsumoto Fine Chemical Co., Ltd.) was added in Example 1 (1-2) to replace 0.1 parts by weight of In addition to the substrate film obtained by using an organosilicon compound, a stacked body and a polarizing plate were produced by referring to Example 1, and evaluated by referring to Example 1. The results are disclosed in Table 1.

[Example 3]

Except that 0.1 parts by weight of organic zirconium compound (n-propyl zirconate, ORGATIX ZA-45, manufactured by Matsumoto Fine Chemical Co., Ltd.) was added in Example 1 (1-2) to replace 0.1 parts by weight of organic In addition to the base film obtained by using a silicon compound, a stacked body and a polarizing plate were produced and evaluated in accordance with Example 1. The results are disclosed in Table 1.

[Example 4]

Except in (1-2) of Example 1, when performing the operation of applying the coating liquid for film formation to the separator using a die coater and drying it, adjusting the coating amount and the like to manufacture a long strip with a thickness of 5 μm Except for the material film (the width and length are the same as in Example 1), a stacked body and a polarizing plate were produced in comparison with Example 1, and evaluated in comparison with Example 1. The results are disclosed in Table 1.

[Example 5]

Except that in (1-2) of Example 1, polyisobutylene was not used, a stacked body and a polarizing plate were manufactured in accordance with Example 1, and evaluated in comparison with Example 1. The results are disclosed in Table 2. The base film used in Example 5 had an MFR of 3 g/10 minutes and a tensile modulus of 800 MPa.

[Example 6]

Except in (1-2) of Example 1, no organosilicon compound was used, and when the film-forming coating liquid was applied to the separator using a die coater and dried, the coating amount was adjusted to produce a thickness of Except for the base film having a length of 5 μm (the width and length are the same as in Example 1), a stacked body and a polarizing plate were produced in accordance with Example 1, and evaluated in comparison with Example 1. The results are disclosed in Table 2.

[Comparative example 1]

In (1-4) of Example 1, only the unstretched polyvinyl alcohol resin film (PVA20) was used instead of the stack produced in (1-3), and the same operation as (1-4) was performed As a result, melting occurred many times in the first stretching process and the second stretching process, and fractures occurred many times in the drying process, and the adhesiveness and black shift could not be evaluated.

[Comparative example 2]

Except that in Example 1 (1-3), a cycloolefin-based resin film with an elastic modulus of 2300 MPa (Zeonor Film, manufactured by Zeon, Japan, with a thickness of 13 μm cannot be measured at a temperature of 190°C and a load of 2.16 kg. MFR) to replace the base film produced in (1-2), a stacked body was produced in accordance with Example 1. As a result of performing the same operation as (1-4) of Example 1 using this stacked body, fracture occurred in the first stretching process and a polarizing plate could not be produced.

The evaluation results of Examples and Comparative Examples are shown in Table 1 and Table 2.

In the table, "COP" means cycloolefin resin.

In the table, "Re2 (50°C)" means the retardation in the in-plane direction of the base film produced when the free end of the stack is uniaxially stretched to 6.0 times at a temperature of 50°C. Re2 (120°C)" means the retardation in the in-plane direction of the base film produced when the free end of the stack is uniaxially stretched to 6.0 times at a temperature of 120°C.

In the table, "Re1" means the retardation in the in-plane direction of the polyvinyl alcohol resin film in the stack.

"Table 1"

"Table 2"

From the results in Table 1 and Table 2, it can be seen that according to the present invention, the phase difference exhibited by the substrate film after the process of stretching the stack can be reduced, and polarized light with excellent adhesion, drying processability, and optical physical properties can be obtained. plate. From this, it can be seen that it is possible to provide a stacked body for polarizing plates that "can be used even if the base film is used as a protective film, and can be efficiently manufactured even if it is thin", a polarizing plate and a display device using the stacked body, and a polarizing plate manufacturing method.

10. 15‧‧‧Stacks (stacks for polarizing plates) 11‧‧‧Polyvinyl alcohol resin film (PVA resin film) 12‧‧‧Substrate film 13‧‧‧Adhesive layer 100, 120, 130, 150, 160, 170‧‧‧polarizer 111‧‧‧Polyvinyl alcohol resin film (PVA resin film) 112‧‧‧Substrate film 113, 114‧‧‧adhesive layer 115‧‧‧Protective film 116‧‧‧Adhesive layer 200‧‧‧Manufacturing device 201, 202‧‧‧rolling out device 203‧‧‧Rewinding device 205‧‧‧Laminating device 300‧‧‧Manufacturing device 301, 307‧‧‧rolling out device 302～305‧‧‧processing device 306, 309‧‧‧drying device 308‧‧‧Laminating device 310‧‧‧Rewinding device 400, 450, 460‧‧‧display device (liquid crystal display device) 410, 420‧‧‧substrate 430‧‧‧LCD layer 500, 550, 560‧‧‧display device (organic EL display device) 510, 520‧‧‧substrate 530‧‧‧luminescent layer

<FIG. 1> FIG. 1 is a schematic cross-sectional view of a stacked body for polarizing plates related to Embodiment 1 of the present invention.

<FIG. 2> FIG. 2 is a schematic diagram showing an example of a manufacturing apparatus for a stacked body for polarizing plates related to Embodiment 1.

<FIG. 3> FIG. 3 is a schematic cross-sectional view of a polarizing plate manufactured using the stacked body for polarizing plates related to Embodiment 1 of the present invention.

<FIG. 4> FIG. 4 is a schematic view showing an example of a manufacturing apparatus for manufacturing a polarizing plate using the polarizing plate stack according to Embodiment 1.

<FIG. 5> FIG. 5 is a schematic cross-sectional view showing a polarizing plate according to Modification 1 manufactured using the stacked body for polarizing plates according to Embodiment 1 of the present invention.

<FIG. 6> FIG. 6 is a schematic cross-sectional view showing a polarizing plate according to Modification 2 manufactured using the stacked body for polarizing plates according to Embodiment 1 of the present invention.

<FIG. 7> FIG. 7 is a schematic cross-sectional view of a stacked body for polarizing plates related to Embodiment 2 of the present invention.

<FIG. 8> FIG. 8 is a schematic cross-sectional view of a polarizing plate manufactured using the stacked body for polarizing plates related to Embodiment 2 of the present invention.

<FIG. 9> FIG. 9 is a schematic cross-sectional view showing a polarizing plate according to Modification 3 manufactured using the stacked body for polarizing plates according to Embodiment 2 of the present invention.

<FIG. 10> FIG. 10 is a schematic cross-sectional view showing a polarizing plate according to Modification 4 manufactured using the stacked body for polarizing plates related to Embodiment 2 of the present invention.

<FIG. 11> FIG. 11 is a schematic cross-sectional view of a display device related to Embodiment 3 of the present invention.

<FIG. 12> FIG. 12 is a schematic cross-sectional view of a display device related to Embodiment 4 of the present invention.

<FIG. 13> FIG. 13 is a schematic cross-sectional view of a display device related to Embodiment 5 of the present invention.

<FIG. 14> FIG. 14 is a schematic cross-sectional view of a display device related to Embodiment 6 of the present invention.

<FIG. 15> FIG. 15 is a schematic cross-sectional view of a display device related to Embodiment 7 of the present invention.

<FIG. 16> FIG. 16 is a schematic cross-sectional view of a display device related to Embodiment 8 of the present invention.

10‧‧‧Stack (stack for polarizer)

11‧‧‧Polyvinyl alcohol resin film (PVA resin film)

12‧‧‧Substrate film

13‧‧‧Adhesive layer

Claims (12)

A stacked body for polarizing plates, which is a stacked body for polarizing plates comprising an unstretched polyvinyl alcohol resin film and a base film, wherein the retardation Re1 in the in-plane direction of the polyvinyl alcohol resin film is 50 nm or less, and the thickness T is less than 45 μm, the substrate film is a film made of resin, the melt flow rate of the resin is above 1g/10 minutes, and the melt flow rate is measured at 190°C under a load of 2.16kg. The tensile elastic modulus E of the resin is not less than 50 MPa and not more than 1200 MPa, the resin contains an organometallic compound, and the ratio of the organometallic compound is not less than 0.005 parts by weight and not more than 1.0 parts by weight relative to 100 parts by weight of the resin, and the base film The phase difference Re2 in the in-plane direction of the extension is 0 nm to 20 nm, and the phase difference Re2 is uniaxially extended to 6.0 times at the free end of the polarizing plate stack under the temperature condition of 50 ° C ~ 120 ° C, When the base film is made into the extension, the extension has a phase difference, the resin is a cycloolefin resin, and the cycloolefin resin includes a cycloolefin polymer, and the cycloolefin polymer is A hydrogenated block copolymer [D] after hydrogenation, the block copolymer [D] is composed of: a polymer block mainly composed of a repeating unit [I] derived from an aromatic vinyl compound [A], with Polymer block [B] mainly composed of repeating unit [I] derived from aromatic vinyl compound and repeating unit [II] derived from chain conjugated diene compound, or polymer block [B] derived from chain conjugated diene compound The repeating unit [II] of the vinyl compound is formed as the polymer block [C] of the main component. The stacked body for polarizing plates according to claim 1, wherein the cycloolefin-based resin contains a plasticizer, a softener, or both. The stacked body for polarizing plates according to claim 2, wherein the plasticizer, the softener or both are one or more selected from ester plasticizers and aliphatic hydrocarbon polymers. The stacked body for polarizing plates according to claim 1, wherein the base film is stacked on the polyvinyl alcohol resin film through an adhesive layer. A polarizing plate, which is uniaxially stretching the stacked body for polarizing plates according to any one of Claims 1 to 4. The polarizing plate according to claim 5, wherein a protective film or an adhesive is provided on a surface of the polarizing plate on which the polyvinyl alcohol resin film is not stacked with the base film. The polarizing plate according to claim 6, wherein the protective film is made of one or more resins selected from cycloolefin resins, acrylic resins, polyethylene terephthalate resins, and triacetyl cellulose resins. A display device, which has two substrates, a liquid crystal layer located therebetween, and the polarizing plate according to any one of claims 5 to 7, the polarizing plate is arranged on the outside of at least one of the two substrates . A display device, which has two substrates, a light-emitting layer located therebetween, and the polarizing plate according to any one of claims 5 to 7, the polarizing plate is arranged on the outside of one of the two substrates. The display device according to claim 8, wherein a base film of the polarizing plate is provided between the polyvinyl alcohol resin film of the polarizing plate and the liquid crystal layer. The display device according to claim 9, wherein a base film of the polarizing plate is provided between the polyvinyl alcohol resin film of the polarizing plate and the light-emitting layer. A method of manufacturing a polarizing plate, comprising the step of uniaxially stretching the stacked body for polarizing plates according to any one of Claims 1 to 4.

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