KR20200104297A - Polarizing plate laminate, polarizing plate, display device, and manufacturing method of polarizing plate - Google Patents

Abstract

A laminate comprising an unstretched polyvinyl alcohol resin film and a base film, wherein the polyvinyl alcohol resin film has a retardation Re1 of 50 nm or less in an in-plane direction, and a thickness T of 45 μm or less, and the base film is a resin The resin has a melt flow rate of 1 g/10 min or more measured under specific conditions, and a tensile modulus E of 50 MPa or more and 1200 MPa or less, and the in-plane direction of the stretched product of the base film A laminate for a polarizing plate in which the retardation Re2 is 0 nm or more and 20 nm or less.

Description

Polarizing plate laminate, polarizing plate, display device, and manufacturing method of polarizing plate

The present invention relates to a laminate for polarizing plates, a polarizing plate, a display device, and a method of manufacturing a polarizing plate.

BACKGROUND ART As a display device such as a liquid crystal display device and an organic electroluminescent (EL) display device, conventionally, a display device having a large display area, a light weight, and a thin thickness has been demanded. Therefore, the panel constituting the display device has conventionally been required to be thin.

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 construct a thin display device, a thinner polarizing plate is also required. In particular, since the polarizer may shrink in the use environment of the display device, in a display device having a thin and large area, warping due to such shrinkage may be a problem. Therefore, by employing a thin polarizer having a thickness of 10 μm or less, in addition to a reduction in the thickness of the display device due to the reduction in the thickness of the polarizer itself, a reduction in the occurrence of warpage as described above can be expected.

By the way, when a polarizer of such a thin polyvinyl alcohol is to be manufactured by a conventional manufacturing method, melting of the polarizer is frequent. As a method of preventing the melting of the polarizer and manufacturing a polarizing plate including a thin polarizer, several methods have been proposed.

For example, in Patent Document 1, a polyvinyl alcohol-based resin layer is formed by applying an aqueous solution containing a polyvinyl alcohol-based resin to an amorphous ester-based thermoplastic resin substrate to form a laminate, and the laminate is stretched. , A method of obtaining an optical film by aligning a dichroic substance to obtain a colored laminate, and stretching the colored laminate to obtain an optical film is proposed.

Japanese Patent No. 491205 (corresponding publication: US patent No. 8314987 specification)

In the case of manufacturing a thin polarizing plate by the method described in Patent Document 1, a phase difference may occur in the base film after the stretching treatment due to stretching the laminate at a high stretching ratio. In such a case, it is difficult to use the base film as it is as a polarizing plate protective film, and since it is peeled and discarded, a waste material is generated. In addition, a protective film for protecting the polarizing plate may be separately prepared and affixed to the polarizing plate may occur.

Accordingly, in the present invention, the base film can be used also as a protective film, and a laminate for a polarizing plate that can be efficiently produced even if the thickness is thin, a polarizing plate and a display device provided with the laminate, and a method for producing the polarizing plate It aims to provide.

As a result of examining in order to solve the above problems, the present inventors have used a base film made of a polyvinyl alcohol resin film having an in-plane retardation and a thickness within a predetermined range, and a flexible resin capable of stretching at a low temperature to a high magnification, Having found that the above problems can be solved, the present invention was completed.

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

[1] As a laminate for a polarizing plate comprising an unstretched polyvinyl alcohol resin film and a base film,

The polyvinyl alcohol resin film has a retardation Re1 of 50 nm or less in the in-plane direction, and a thickness T of 45 μm or less,

The base film is a film made of a resin,

The resin has a melt flow rate of 1 g/10 min or more, and the melt flow rate is a value measured at 190°C and a load of 2.16 kg,

The resin has a tensile modulus E of 50 MPa or more and 1200 MPa or less,

The retardation Re2 in the in-plane direction of the stretched material of the base film is 0 nm or more and 20 nm or less, and the retardation Re2 is the free end uniaxial stretching of the laminate for polarizing plate at 6.0 times under a temperature condition of 50°C to 120°C, and the base material A laminate for a polarizing plate which is a retardation of the stretched product when the film is used as the stretched product.

[2] The resin is a cycloolefin resin,

The cycloolefin-based resin contains a cycloolefin-based polymer,

The cycloolefin polymer is a polymer block [A] containing as a main component a repeating unit [I] derived from an aromatic vinyl compound,

A polymer block [B] containing as main components a repeating unit [I] derived from an aromatic vinyl compound and a repeating unit [II] derived from a chain conjugated diene compound, or a repeating unit [II] derived from a chain conjugated diene compound as a main component Polymer block [C]

A block copolymer [D] consisting of

The laminate for polarizing plates according to [1], which is a hydrogenated block copolymer hydride.

[3] A laminate for polarizing plates comprising an unstretched polyvinyl alcohol resin film and a base film,

The polyvinyl alcohol resin film has a retardation Re1 of 50 nm or less in the in-plane direction, and a thickness T of 45 μm or less,

The base film is a film made of a resin,

The resin is a cycloolefin resin,

The cycloolefin-based resin contains a cycloolefin-based polymer,

The cycloolefin polymer is a polymer block [A] containing as a main component a repeating unit [I] derived from an aromatic vinyl compound,

A polymer block [B] containing as main components a repeating unit [I] derived from an aromatic vinyl compound and a repeating unit [II] derived from a chain conjugated diene compound, or a repeating unit [II] derived from a chain conjugated diene compound as a main component Polymer block [C]

A block copolymer [D] consisting of

It is a hydrogenated block copolymer hydride,

The retardation Re2 in the in-plane direction of the stretched material of the base film is 0 nm or more and 20 nm or less, and the retardation Re2 is the free end uniaxial stretching of the laminate for polarizing plate at 6.0 times under a temperature condition of 50°C to 120°C, and the base material A laminate for a polarizing plate which is a retardation of the stretched product when the film is used as the stretched product.

[4] The laminate for polarizing plates according to [2] or [3], in which the cycloolefin-based resin contains a plasticizer, a softener, or both.

[5] The laminate for polarizing plates according to [4], wherein the plasticizer, the softener, or both are at least one selected from an ester plasticizer and an aliphatic hydrocarbon polymer.

[6] The laminate for polarizing plates according to any one of [1] to [5], in which 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 laminated on the polyvinyl alcohol resin film through an adhesive layer.

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

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

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

[11] two substrates, a liquid crystal layer interposed therebetween,

A display device comprising the polarizing plate according to any one of [8] to [10], which is disposed outside at least one of the two substrates.

[12] two substrates, and a light-emitting layer positioned between them,

A display device having the polarizing plate according to any one of [8] to [10], which is disposed outside one of the two substrates.

[13] The display device according to [11], in which 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], in which 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 including a step of uniaxially stretching the laminate for polarizing plates according to any one of [1] to [7].

According to the present invention, a base film can also be used as a protective film, and a laminate for a polarizing plate that can be efficiently produced even if the thickness is thin, a polarizing plate and a display device using the laminate, and a method for producing a polarizing plate using the laminate Can provide.

1 is a cross-sectional view schematically showing a laminate for polarizing plates according to Embodiment 1 of the present invention.
2 is a diagram schematically showing an example of an apparatus for manufacturing a laminate for polarizing plates according to the first embodiment.
3 is a cross-sectional view schematically showing a polarizing plate manufactured using the laminate for polarizing plates according to Embodiment 1 of the present invention.
4 is a view schematically showing an example of a manufacturing apparatus for manufacturing a polarizing plate using the laminate for polarizing plates according to the first embodiment.
5 is a cross-sectional view schematically showing a polarizing plate of Modified Example 1 manufactured using the laminate for polarizing plates according to Embodiment 1 of the present invention.
6 is a cross-sectional view schematically showing a polarizing plate of Modified Example 2 manufactured using the laminate for polarizing plates according to Embodiment 1 of the present invention.
7 is a cross-sectional view schematically showing a laminate for a polarizing plate according to Embodiment 2 of the present invention.
Fig. 8 is a cross-sectional view schematically showing a polarizing plate manufactured using the laminate for polarizing plates according to the second embodiment of the present invention.
9 is a cross-sectional view schematically showing a polarizing plate of Modified Example 3 manufactured using the laminate for a polarizing plate according to Embodiment 2 of the present invention.
10 is a cross-sectional view schematically showing a polarizing plate of Modified Example 4 manufactured using the laminate for polarizing plates according to Embodiment 2 of the present invention.
11 is a cross-sectional view schematically showing a display device according to a third embodiment of the present invention.
12 is a cross-sectional view schematically showing a display device according to a fourth embodiment of the present invention.
13 is a cross-sectional view schematically showing a display device according to a fifth embodiment of the present invention.
14 is a cross-sectional view schematically showing a display device according to a sixth embodiment of the present invention.
15 is a cross-sectional view schematically showing a display device according to Embodiment 7 of the present invention.
16 is a cross-sectional view schematically showing a display device according to an eighth embodiment of the present invention.

Hereinafter, the present invention is described in detail by showing embodiments and examples. However, the present invention is not limited to the embodiments and examples described below, and may be carried out with arbitrary changes within the scope not departing from the claims of the present invention and their equivalent ranges.

In the present application, the term "long picture" refers to a film having a length of 5 times or more with respect to the width of the film, and preferably has a length of 10 times or more, and specifically, the degree to which it is wound in rolls and stored or transported. It refers to having a length of. The upper limit of the ratio of the length to the width of the film is not particularly limited, but may be, for example, 100,000 times or less.

In the present application, the retardation Re in the in-plane direction of the film and the retardation Rth in the thickness direction are, according to the formula Re = (nx-ny) × d, and Rth = [{(nx + ny)/2}-nz] × d Calculate. In addition, the Nz coefficient of the film is a value represented by [(nx-nz)/(nx-ny)], and can also be represented by [(Rth/Re) + 0.5]. Here, nx is the refractive index of the film in the in-plane slow axis direction (maximum refractive index in the plane), ny is the refractive index in the in-plane direction perpendicular to the in-plane slow axis of the film, and nz is the refractive index in the thickness direction of the film , d is the thickness (nm) of the film. Unless otherwise noted, the measurement wavelength is set to 550 nm, which is a typical wavelength in the visible region.

[Embodiment 1: Laminate for polarizing plate and polarizing plate]

Hereinafter, the laminated body for a polarizing plate of Embodiment 1 which is an embodiment of the present invention, a polarizing plate manufactured using the laminated body, and a manufacturing method thereof will be described with reference to FIGS. 1 to 4.

[One. Laminate for polarizing plate]

The laminated body for polarizing plates of the present invention (hereinafter, also simply referred to as "laminated body") includes an unstretched polyvinyl alcohol resin film and a base film. 1 is an example of a cross-sectional view schematically showing a layered product 10 of Embodiment 1 according to the present invention. As shown in FIG. 1, the laminated body 10 of this embodiment includes the unstretched polyvinyl alcohol resin film 11 and the base film 12 provided 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 to each other. The laminate 10 of the present invention is a material for manufacturing a polarizer (polarizing plate).

[Polyvinyl alcohol resin film]

In the present invention, the polyvinyl alcohol resin film is a film having a retardation Re1 of 50 nm or less in the in-plane direction and a thickness T of 45 μm or less. The polyvinyl alcohol resin film is an unstretched film made of a polyvinyl alcohol resin (hereinafter, "polyvinyl alcohol" is sometimes abbreviated as "PVA"). In this application, the "unstretched film" refers to a thing not provided for an extending|stretching process.

In the present invention, the PVA resin film (polyvinyl alcohol resin film) is not necessarily limited, but it is preferable to use one produced by saponifying polyvinyl acetate obtained by polymerizing vinyl acetate from the viewpoint of availability. The PVA contained in the PVA resin is preferably in the range of 500 to 8000, and the degree of saponification is preferably 90 mol% or more from the viewpoint of excellent stretchability and polarization performance of the obtained polarizer. Here, the degree of polymerization is an average degree of polymerization measured according to the description of JIS K6726-1994, and the degree of saponification is a value measured according to the description of JIS K6726-1994. A more preferable range of the degree of polymerization is 1000 to 6000, and still more preferably 1500 to 4000. A more preferable range of the degree of saponification is 95 mol% or more, and still more preferably 99 mol% or more. PVA may be a copolymer of vinyl acetate and another monomer copolymerizable or may be a graft polymer.

In the present invention, the production method of the PVA resin film is not particularly limited, and can be produced by any method such as a known method. Examples of the production method include a cast film-forming method, a wet film-forming method (discharge into a poor solvent), a gel film-forming method (a PVA aqueous solution is once cooled and gelled) using a PVA solution in which PVA is dissolved in a solvent as a film-forming stock solution. Thereafter, the method by extracting and removing the solvent to obtain a PVA resin film) and a combination thereof are mentioned. As a further example of the manufacturing method, a melt-extrusion film-forming method in which PVA containing a solvent is melted as a film-forming stock solution is mentioned. Among these, the casting film forming method and the melt extrusion film forming method are preferable from the viewpoint of obtaining a PVA resin film having high transparency and little coloring, and a melt extrusion film forming method is more preferable.

In the present invention, the PVA resin film preferably contains a plasticizer such as polyhydric alcohol such as glycerin in an amount of 0.01 to 30% by weight based on PVA in order to improve mechanical properties and process passability during secondary processing. In addition, in order to improve handling properties and film appearance, it is preferable to contain surfactants such as anionic surfactants and nonionic surfactants in an amount of 0.01 to 1% by weight based on PVA.

If necessary, the PVA resin film may further contain optional components such as antioxidants, ultraviolet absorbers, lubricants, pH adjusters, inorganic fine particles, colorants, preservatives, flame retardants, polymer compounds other than the above components, and moisture. . The PVA resin film may include one or two or more of the above optional 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, still more preferably 20 μm or less, preferably 5 μm or more, more preferably 10 μm or more, even more preferably It is more than 15 μm. When the thickness of the PVA resin film is equal to or less than the upper limit of the above range, the shrinking force of the polarizing plate can be effectively lowered, and when the thickness is equal to or greater than the lower limit of the above range, a polarizing plate having sufficiently high polarization 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, still more preferably 20 nm or less, preferably 0 nm or more, and more preferably 3 nm or more. When the retardation Re1 in the in-plane direction of the PVA resin film is equal to or less than the upper limit of the above range, the laminate can be stretched at a sufficient magnification, and a polarizing plate having high polarization performance can be obtained.

The shape and dimensions of the PVA resin film can be suitably adjusted to those according to the intended use. In terms of production efficiency, it is preferable that the PVA resin film is a long film.

[Substrate film]

The base film is a layer different from the PVA resin film and is a film made of a resin. In the present invention, the resin for forming the base film is a resin having flexibility capable of stretching at a low temperature (eg, 50 to 120°C) with a high draw ratio (eg, 6.0 times). In the present invention, the resin forming the base film is a resin (resin A) having 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 a predetermined cycloolefin It is a cycloolefin resin (resin B) containing a system polymer.

[Resin A]

In the present invention, the melt flow rate of the resin A forming the base film is 1 g/10 min or more, preferably 3 g/10 min or more, more preferably 5 g/10 min or more, and preferably It is 300 g/10 min or less, more preferably 100 g/10 min or less. The melt flow rate here is a value measured at 190°C and a load of 2.16 kg. Hereinafter, “melt flow rate measured at 190° C. and load of 2.16 kg” is also simply referred to as “MFR”. When the MFR of the resin A is set to be equal to or greater than the lower limit, the phase difference can be suppressed to be small when the polarizing plate is used, and the heat resistance can be improved by setting the MFR to be equal to or less than the upper limit.

The MFR of resin A is based on JIS-K-7210, and can be measured under the conditions of a temperature of 190°C and a load of 2.16 kg using a melt indexer.

In the present invention, the tensile modulus E of the resin A forming the base film is 50 MPa or more, preferably 100 MPa or more, more preferably 200 MPa or more, 1200 MPa or less, preferably 1000 MPa or less, more It is preferably 800 MPa or less. By making the tensile elastic modulus E of the resin A equal to or higher than the lower limit, the retardation of the base film is reduced when the laminate is stretched to form a polarizing plate, and it is set to be equal to or less than the upper limit, thereby preventing the occurrence of fracture of the base film when stretching the laminate. have.

Resin A forming the base film is not particularly limited as long as it has an MFR of 1 g/10 min or more and a tensile modulus E of 50 MPa or more and 1200 MPa or less, but such resins have transparency and water vapor barrier properties. Cycloolefin-based resins containing a cycloolefin-based polymer are preferred from the viewpoint of excellent.

As the cycloolefin-based polymer, a polymer block [A] containing as a main component a repeating unit [I] derived from an aromatic vinyl compound, a repeating unit [I] derived from an aromatic vinyl compound, and a repeating unit derived from a chain conjugated diene compound [ Hydrogenated block copolymer [D] consisting of a polymer block [B] containing II] as a main component or a polymer block [C] containing repeating units [II] derived from a chain conjugated diene compound as a main component This is desirable. As such block copolymer hydrides, WO2000/32646, WO2001/081957, Japanese Patent Application Publication No. 2002-105151, Japanese Patent Application Publication No. 2006-195242, Japanese Patent Application Publication No. 2011-13378, and WO2015/002020 No. The polymers described in the etc. are mentioned.

[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 polymer block [A] containing as a main component a repeating unit [I] derived from an aromatic vinyl compound, a repeating unit [I] derived from an aromatic vinyl compound, and a chain-type conjugated diene compound. A block copolymer obtained by hydrogenation of a block copolymer [D] consisting of a polymer block [B] containing a repeating unit [II] as a main component, or a polymer block [C] containing a repeating unit [II] derived from a chain conjugated diene compound as a main component. It is a combined hydride. As such a block copolymer hydride, the same thing as the above-described block copolymer hydride used suitably as 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, it is preferable that the resin (resin A and resin B) forming the base film contains a plasticizer and/or a softener (either or both of a plasticizer and a softener). By containing a plasticizer and/or a softener, the phase difference generated in the base film can be made small when the laminate is stretched to obtain a polarizing plate.

As plasticizers and softeners, those that can be uniformly dissolved or dispersed in a resin forming a base film may be used. As specific examples of the plasticizer and the softener, an ester plasticizer composed of a polyhydric alcohol and a monovalent carboxylic acid (hereinafter referred to as "polyhydric alcohol ester plasticizer"), and an ester-based plasticizer composed of a polyhydric carboxylic acid and a monohydric alcohol. Ester plasticizers such as plasticizers (hereinafter referred to as "polyvalent carboxylic acid ester plasticizers"), and phosphate ester plasticizers, carbohydrate ester plasticizers, and other polymer softeners.

Although it does not specifically limit as an example of the polyhydric alcohol which is a raw material of the ester plasticizer preferably used in the present invention, ethylene glycol, glycerin, and trimethylolpropane are preferable.

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

Examples of the polyhydric carboxylic acid ester plasticizer include dicarboxylic acid ester plasticizers and other polyhydric carboxylic acid ester plasticizers.

Specific examples of the phosphate ester plasticizer include phosphate alkyl esters such as triacetyl phosphate and tributyl phosphate; Phosphate cycloalkyl esters such as tricyclopentyl phosphate and cyclohexyl phosphate; And phosphate aryl esters such as triphenyl phosphate and tricresyl phosphate.

As a carbohydrate ester plasticizer, specifically, glucose pentaacetate, glucose pentapropionate, glucose pentabutyrate, saccharose octaacetate, saccharose octaacetate, saccharose octabenzoate, and the like are preferably exemplified. .

As the polymer softener, specifically, an aliphatic hydrocarbon polymer, an alicyclic hydrocarbon polymer, ethyl polyacrylate, polymethyl methacrylate, a copolymer of methyl methacrylate and 2-hydroxyethyl methacrylate, and methacrylic acid Acrylic polymers such as a copolymer of methyl, methyl acrylate, and 2-hydroxyethyl methacrylate; Vinyl polymers such as polyvinyl isobutyl ether and polyN-vinylpyrrolidone; Styrene polymers such as polystyrene and poly4-hydroxystyrene; Polyesters such as polybutylene succinate, polyethylene terephthalate, and polyethylene naphthalate; Polyethers such as polyethylene oxide and polypropylene oxide; Polyamide, polyurethane, polyurea, and the like.

Specific examples of the aliphatic hydrocarbon polymer include low molecular weight substances such as polyisobutylene, polybutene, poly-4-methylpentene, poly-1-octene, and ethylene/α-olefin copolymer, and hydrides thereof; And low molecular weight substances such as polyisoprene and polyisoprene-butadiene copolymer, and hydrides thereof. From the viewpoint of being easily dissolved or dispersed uniformly in the cycloolefin resin, the aliphatic hydrocarbon-based polymer preferably has a number average molecular weight of 300 to 5,000.

These polymer softeners may be a homopolymer composed of one type of repeating unit, or may be a copolymer having a plurality of repeating structures. Moreover, you may use in combination of 2 or more types of said polymers.

In the present invention, the plasticizer and/or softener is preferably at least one selected from ester plasticizers and aliphatic hydrocarbon polymers from the viewpoint of particularly excellent compatibility with the resin forming the base film.

The ratio 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, more preferably 0.5 parts by weight, based on 100 parts by weight of the resin forming the base film. It is above, even more preferably 1.0 part by weight or more, on the other hand, it is preferably 50 parts by weight or less, and more preferably 40 parts by weight or less. By making the ratio of a plasticizer etc. into the said range, even if the base film passes through the manufacturing process of a polarizing plate including an extending|stretching process, the expression property of a retardation can be made low enough.

[Organic metal compounds]

In the present invention, it is preferable that the base film contains an organometallic compound. By including the organometallic compound, the occurrence of peeling of the base film can be more effectively suppressed when the laminate is stretched at a high draw ratio (for example, wet stretch at a draw 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. As an organometallic compound, an organosilicon compound, an organotitanium compound, an organoaluminum compound, an organozirconium compound, etc. are mentioned. Among these, an organosilicon compound, an organotitanium compound, and an organozirconium compound are preferable, and an organosilicon compound is more preferable from the viewpoint of excellent reactivity with polyvinyl alcohol. The organometallic compounds may be used singly or in combination of two or more.

As the organometallic compound, an organosilicon compound represented by the following formula (1) may be exemplified, but is not limited thereto.

R ¹ _a Si(OR ² ) _3-a (1)

(In formula (1), R ¹ and R ² are each independently a hydrogen atom, a halogen atom, a hydrocarbon group having 1 to 10 carbon atoms, an epoxy group, an amino group, a thiol group, an isocyanate group, and a carbon atom number 1 Represents a group selected from the group consisting of organic groups of to 10, and a represents an integer of 0 to 3.)

In formula (1), preferred examples of R ¹ include an epoxy group, an amino group, a thiol group, an isocyanate group, a vinyl group, an aryl group, an acrylic group, an alkyl group having 1 to 8 carbon atoms, -CH ₂ OC _n H _{2n +1} (n represents the integer of 1-4.), etc. are mentioned.

In addition, in the formula (1), for example preferred as R ² , a hydrogen atom, a vinyl group, an aryl group, an acrylic group, an alkyl group having 1 to 8 carbon atoms, -CH ₂ OC _n H _2n+1 (n is The integer of 1-4 is shown.), etc. are mentioned.

Examples of organosilicon compounds include epoxy-based organosilicon compounds such as 3-glycidoxypropyltrimethoxysilane, 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, and 3-aminopropyltrimethoxysilane. , Amino-based organosilicon compounds such as N-2-(aminoethyl)-3-aminopropyltrimethoxysilane, isocyanurate-based organosilicon compounds such as tris-(trimethoxysilylpropyl)isocyanurate, And mercapto-based organosilicon compounds such as 3-mercaptopropyl trimethoxysilane, and isocyanate-based organosilicon compounds such as 3-isocyanatopropyl triethoxysilane.

Examples of the organic titanium compound include titanium alkoxides such as tetraisopropyl titanate, titanium chelates such as titanium acetylacetonate, and titanium acylates such as titanium isostearate.

Examples of the organic zirconium compound include zirconium alkoxides such as normal propyl zirconate, zirconium chelates such as zirconium tetraacetylacetonate, and zirconium acylates such as zirconium stearate.

Examples of the organic aluminum compound include aluminum alkoxides such as aluminum secondary butoxide, and aluminum chelates such as aluminum trisacetylacetonate.

The proportion of the organometallic compound in the base film is preferably 0.005 parts by weight or more, more preferably 0.01 parts by weight or more, even more preferably 0.03 parts by weight or more, based on 100 parts by weight of the resin forming the base film. On the other hand, it is preferably 1.0 part by weight or less, more preferably 0.5 part by weight or less. By setting the ratio of the organometallic compound within the above range, it is possible to more effectively suppress the occurrence of peeling of the base film in the case of wet stretching the laminate at a high magnification (for example, a draw ratio of 6.0).

[Optional ingredient]

The base film may contain an optional component in addition to a resin, a plasticizer, an organometallic compound, and the like. Examples of the optional components include stabilizers such as antioxidants, ultraviolet absorbers, and light stabilizers; Resin modifiers such as lubricants; Coloring agents such as dyes and pigments; And an antistatic agent. These blending agents can be used alone or in combination of two or more, and the blending amount is appropriately selected within a range not impairing the object of the present invention.

[Method of manufacturing base film]

The base film is prepared by forming a composition (hereinafter, also referred to as ``resin composition'') containing a component (resin and components added as needed) for forming a base film into a film shape by an arbitrary molding method. I can.

As an example of a method of forming a resin composition into a film, a cast molding method, an extrusion molding method, an inflation molding method, etc. are mentioned, for example.

The thickness of the base film is preferably 1 μm or more, more preferably 3 μm or more, preferably 50 μm or less, and more preferably 20 μm or less. When the thickness of the base film is greater than or equal to the lower limit of the above range, the melting of the polarizer in the polarizing plate forming process can be effectively prevented, and when the thickness of the base film is less than or equal to the upper limit of the range, it occurs in the base film when the laminate is stretched to obtain a polarizing plate. The resulting phase difference can be made small.

[Method of manufacturing laminate]

2 is a schematic diagram schematically showing an example of the apparatus 200 for manufacturing a laminate according to the present embodiment. The manufacturing device 200 includes unwinding devices 201 and 202, a bonding device 205, and a take-up device 203.

As shown in FIG. 2, the PVA resin film 11 unwound from the unwinding device 201 is conveyed to the bonding device 205, an adhesive is applied by the bonding device 205, and unwound from the unwinding device 202 The laminated body 10 is obtained by bonding with the base film 12. The manufactured laminated body 10 is wound up by the take-up device 203, and can be made into the shape of a roll, and can be provided to an additional process.

The adhesive 13 for bonding the PVA resin film 11 and the base film 12 is not particularly limited, and for example, acrylic adhesive, urethane adhesive, polyester adhesive, polyvinyl alcohol adhesive, polyolefin adhesive , Modified polyolefin adhesive, polyvinyl alkyl ether adhesive, rubber adhesive, vinyl chloride-vinyl acetate adhesive, SEBS (styrene-ethylene-butylene-styrene copolymer) adhesive, and ethylene adhesive such as ethylene-styrene copolymer , Acrylic acid ester adhesives such as ethylene-(meth) acrylate copolymer and ethylene-(meth) acrylate copolymer may be used. Since the occurrence of peeling of the PVA resin film 11 and the base film 12 in the case of wet stretching the laminate at a high magnification (for example, a draw ratio of 6.0) can be more effectively suppressed, the adhesive It is preferable to use.

The surface of the base film 12 adhered to the PVA resin film or the surface of the PVA resin film adhered to the base film 12 is easily adhered such as corona treatment, saponification treatment, primer treatment, anchor coating treatment, etc.接着) treatment may be performed.

[Laminate]

In the present invention, Re2 is 0 nm or more and 20 nm or less. Re2 is preferably 0 nm or more, preferably 10 nm or less, and more preferably 5 nm or less. When Re2 is equal to or less than the upper limit, when the layered product 10 is stretched to form a polarizing plate, the retardation expressed in the base film can be reduced.

Re2, when the laminate 10 is uniaxially stretched at a free end by 6.0 times under a temperature condition of 50°C to 120°C, and the base film in the laminate is used as a stretched product, the stretched product of the base film has, It is the phase difference in the in-plane direction. That is, Re2 is not the retardation of the base film itself in the laminate, but is a retardation that occurs in the stretched product of the base film after applying a specific stretching treatment to the laminate.

The stretching temperature for obtaining such a stretched product may be any temperature within the range of 50°C to 120°C. Accordingly, a plurality of operating conditions for stretching to obtain a stretched product can be considered. When the stretched product exhibits a phase difference of 0 nm or more and 20 nm or less under any one of such a plurality of operating conditions, the layered product satisfies the above requirements.

However, it is preferable that the stretched product exhibits a phase difference of 0 nm or more and 20 nm or less depending on all of the plurality of operation conditions that can be taken. In that case, in the manufacture of a polarizing plate by the laminated body for polarizing plates of this invention, a high degree of freedom in setting the stretching conditions can be obtained.

In general, in the temperature range, when the stretching temperature is lower, a larger phase difference is expressed. Therefore, if both of the retardation of the stretched object by stretching at 50° C. and the retardation of the stretched object by stretching at 120° C. are within the range of 0 nm or more and 20 nm or less, the stretched material is 0 nm or more and 20 nm or less according to all of the above plurality of operating conditions. It can be judged that a phase difference is expressed.

The laminate 10 of the present invention is a material for manufacturing a polarizing plate. The laminated body becomes a polarizing plate after performing predetermined treatments such as stretching treatment and dyeing treatment. Hereinafter, the polarizing plate of the present invention manufactured using the laminate 10 of the present embodiment will be described.

[2. Polarizer]

The polarizing plate 100 of the present invention is obtained by uniaxially stretching the laminate 10 of the present embodiment. 3 is a cross-sectional view schematically illustrating a polarizing plate 100 manufactured using the laminate 10 according to the present embodiment.

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

[Polarizing plate manufacturing method]

A method of manufacturing a polarizing plate using the laminate according to Embodiment 1 of the present invention will be described. 4 is a diagram schematically showing an example of a manufacturing apparatus 300 for manufacturing a polarizing plate 100 using the laminate 10 according to the present embodiment.

As shown in FIG. 4, the manufacturing apparatus 300 includes unwinding apparatuses 301 and 307, processing apparatuses 302-305, drying apparatuses 306 and 309, bonding apparatuses 308, and winding apparatuses 310. It is equipped with.

The manufacturing method of the polarizing plate of the present invention includes a step of uniaxially stretching the laminate of the present invention (stretching treatment step). The manufacturing method of the polarizing plate of the present invention may include a dyeing treatment step of dyeing a laminate and/or a drying step of drying the laminate. In this embodiment, the layered product 10 unwound from the unwinding device 301 is conveyed to the processing devices 302-305 to dye the PVA resin film of the layered product (dyeing treatment step), lamination A stretching treatment (stretching treatment step) of uniaxially stretching the sieve, and a predetermined treatment are performed. The polarizing plate 100 is obtained by performing a treatment (drying step) of drying the laminate after performing these treatments in the drying device 306. Hereinafter, each process will be described in detail.

[Stretching treatment process]

In the present embodiment, the stretching treatment step is a step of uniaxially stretching the laminate. Although it does not specifically limit as a method of extending|stretching a laminated body, Wet stretching is preferable. The stretching process may be performed once or may be performed twice or more.

The draw ratio of the laminate is preferably 5.0 or more, more preferably 5.5 or more, preferably 7.0 or less, and more preferably 6.5 or less. When the draw ratio of the laminate is less than or equal to the upper limit of the above range, the expression of the retardation of the base film can still be lowered and the occurrence of breakage of the polarizing plate can be prevented, even after the manufacturing process of the polarizing plate including the stretching treatment. When is equal to or more than the lower limit of the above range, a polarizing plate having sufficient polarization performance can be obtained. In the case where stretching of the laminate is performed two or more times, it is preferable that the total stretching ratio represented by the product of the stretching ratios of each time is within the above range.

The stretching temperature of the laminate is not particularly limited, but is preferably 30°C or higher, more preferably 40°C or higher, particularly preferably 50°C or higher, preferably 140°C or lower, and more preferably 90°C or lower. , Particularly preferably 70°C or less. When the extending|stretching temperature is more than the lower limit of the said range, extending|stretching can be performed smoothly, and when it is below the upper limit of the said range, effective orientation can be performed by extending|stretching. The range of the stretching temperature is preferably any of dry stretching and wet stretching, but particularly preferably in the case of wet stretching.

The stretching treatment of the laminate may be any of a longitudinal stretching treatment in which stretching is performed in the film longitudinal direction, a transverse stretching treatment in which stretching is performed in the width direction of the film, and an oblique stretching treatment in which stretching is performed in an oblique direction that is neither parallel nor perpendicular to the film width direction. You may do it. In the stretching treatment of the laminate, free uniaxial stretching is preferred, and free uniaxial stretching in the longitudinal direction is more preferred.

[Dyeing treatment process]

The dyeing treatment process is a process of dyeing the PVA resin film of the laminate. In the present embodiment, the manufacturing method of the polarizing plate includes the dyeing treatment (step) for 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 step may be performed before the stretching treatment. In addition, dyeing of the PVA resin film may be performed with respect to the PVA resin film before forming the laminate.

A dichroic substance is mentioned as a substance for dyeing a PVA resin film in a dyeing process, and iodine, an organic dye, etc. are mentioned as a dichroic substance. The dyeing method using these dichroic substances is arbitrary. For example, dyeing may be performed by immersing a layer of a PVA resin film in a dyeing solution containing a dichroic substance. In addition, when iodine is used as the dichroic substance, the dyeing solution may contain iodide such as potassium iodide from the viewpoint of increasing dyeing efficiency. There is no particular limitation on the dichroic material, but when the polarizing plate is used in a vehicle-mounted display device, an organic dye is preferable as the dichroic material.

[Drying process]

The drying step is a step of drying the laminate that has undergone treatment steps such as a dyeing treatment step and a stretching treatment step. In the drying step, it is preferable to dry the laminate after the treatment step in a dryer at a temperature of 50°C to 100°C for 0.5 to 10 minutes. The drying temperature of the laminate is more preferably 60°C or higher, and more preferably 90°C or lower. By making the drying temperature more than the lower limit, the drying time is shortened, and the crack of the PVA resin film can be prevented by making the drying temperature less than or equal to the upper limit. The drying time of the laminate is more preferably 1 minute or more, and more preferably 5 minutes or less. By making the drying time more than the lower limit, drying of the said laminated body is made sufficient, and cracking of the PVA resin film in a laminated body can be prevented by making it less than an upper limit.

In the conventional thin film polarizer made of only PVA resin, cracks may occur after the drying step, but the polarizing plate of this embodiment is manufactured using a laminate including a base film together with a PVA resin film, so drying Even after passing through the process, the occurrence of cracks in the polarizer can be suppressed.

[Characteristics of each layer in a polarizing plate]

The thickness of the PVA resin film in the polarizing plate is preferably 20 μm or less, more preferably 10 μm or less, preferably 3 μm or more, and more preferably 5 μm or more. When the thickness is equal to or less than the upper limit, the thickness of the polarizing plate can be reduced, and when the thickness is equal to or greater than the lower limit, a polarizing plate having sufficiently high polarization performance can be obtained.

The retardation in the in-plane direction of the base film in the polarizing plate is preferably 20 nm or less, more preferably 15 nm or less, further preferably 10 nm or less, and preferably 0 nm or more. When the retardation in the in-plane direction of the base film in the polarizing plate is within the above range, it is possible to suppress a black color shift when the polarizing plate is mounted on a liquid crystal display device.

[3. Action and effect of this embodiment]

In this embodiment, a polarizing plate is produced by stretching a laminate comprising a PVA resin film having a small in-plane retardation Re1 and a thin thickness, and a base film made of a flexible resin capable of stretching at low temperature with high magnification, Even when the laminate is stretched at a low temperature and at a high magnification, the occurrence of melting of the PVA resin film can be suppressed, and further, the expression of the phase difference in the base film after stretching can be suppressed. As a result, according to the present embodiment, the base film can be used as a protective film on one side of the PVA resin film as it is without peeling off, and since waste materials can be reduced, the base film can also be used as a protective film, Even if the thickness is thin, it is possible to provide a method of manufacturing a polarizing plate that can be efficiently manufactured.

[Modified Example 1]

Hereinafter, a polarizing plate 120 of Modification Example 1 manufactured using the laminate 10 according to the first embodiment of the present invention will be described with reference to FIGS. 4 and 5.

5 is a cross-sectional view schematically showing a polarizing plate 120 of Modification Example 1 manufactured using the laminate 10 according to the first embodiment of the present invention. In this polarizing plate 120, as shown in FIG. 5, the base film 112 is laminated on one side (the upper side of the illustration) of the PVA resin film 111, and the other side of the PVA resin film 111 A protective film 115 is laminated on the side (lower side of the figure). In Fig. 5, 113 and 114 are adhesive layers. As the adhesive for bonding the protective film 115 to the PVA resin film, the same adhesive as for bonding the base film to the PVA resin film can be used.

The manufacturing method of the polarizing plate 120 according to this example includes a step of bonding 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 the first embodiment is conveyed to the bonding device 308, and on the side of the PVA resin film 111 on the side where the base film 112 is not laminated. The polarizing plate 120 provided with the protective film 115 is obtained by applying the adhesive 114 and bonding it with the protective film 115 unwound from the unwinding apparatus 307. The manufactured polarizing plate 120 is wound up by the take-up device 310 to form a roll shape, and can be provided to an additional process.

In this example, as the protective film 115, a film made of at least one resin selected from cycloolefin resin, acrylic resin, polyethylene terephthalate resin, and triacetylcellulose resin can be used.

Like the polarizing plate of Embodiment 1, the polarizing plate of this example also has a laminate comprising a PVA resin film having a small in-plane retardation Re1 and a thin thickness, and a base film made of a flexible resin capable of stretching at a high magnification at low temperatures. Since a polarizing plate is produced by stretching, it has the same effect as in the first embodiment.

In addition, according to this example, since the protective film 115 is provided on the side of the PVA resin film 111 on the side where the base film 112 is not laminated, scratches, etc., are generated on the surface of the PVA resin film 111. It also exerts the effect of preventing it.

[Modified Example 2]

Hereinafter, a polarizing plate 130 of Modification Example 2 manufactured using the laminate 10 according to the first embodiment of the present invention will be described with reference to FIG. 6.

6 is a cross-sectional view schematically showing a polarizing plate 130 of Modification Example 2 manufactured using the laminate 10 according to the first embodiment of the present invention.

6 is a cross-sectional view schematically showing the polarizing plate 130 of this example. In this polarizing plate 130, as shown in FIG. 6, a base film 112 is laminated on one side (upper side of the illustration) of the PVA resin film 111, and the other side of the PVA resin film 111 The pressure-sensitive adhesive layer 116 is laminated on the side (lower side of the figure).

The manufacturing method of the polarizing plate 130 according to this example includes a step of forming the pressure-sensitive adhesive layer 116 on the PVA resin film 111 of the polarizing plate 100 obtained in the first embodiment.

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

The polarizing plate 130 of this example has a commercially available pressure-sensitive adhesive layer, for example, on the side of the polarizing plate 100 of the first embodiment on the side where the base film 112 of the PVA resin film 111 is not laminated. It is obtained by transferring an adhesive layer from a film (for example, "Mask series" manufactured by Fujimori Industries) to form an adhesive layer.

Like the polarizing plate of Embodiment 1, the polarizing plate 130 of this example also includes a PVA resin film having a small in-plane retardation Re1 and a thin thickness, and a base film made of a flexible resin capable of high magnification stretching at low temperatures. Since a polarizing plate is manufactured by extending|stretching a laminated body, it has the same function and effect as Embodiment 1.

In addition, according to this example, since the pressure-sensitive adhesive layer 116 is provided on the side of the PVA resin film 111 on the side on which the base film 112 is not laminated, scratches or the like occur on the surface of the PVA resin film 111 It also exerts the effect of preventing it.

[Embodiment 2: Laminate for polarizing plate and polarizing plate]

Hereinafter, a laminate 15 (a laminate for a polarizing plate) according to an embodiment 2, which is an embodiment of the present invention, and a polarizing plate 150 manufactured using the laminate 15, and a method of manufacturing the same, This will be described with reference to FIG. 8. The same reference numerals are assigned to the same configurations and aspects as those of the first embodiment, and duplicate descriptions are omitted.

7 is a cross-sectional view schematically showing a laminate 15 according to Embodiment 2 of the present invention, and FIG. 8 is a schematic view of a polarizing plate 150 manufactured using the laminate 15 according to the present embodiment. It is a sectional view shown.

[Laminate]

The laminated body 15 of the present embodiment is different from the laminated body of the first embodiment in that the base film 12 is directly laminated on the PVA resin film 11.

As a method of directly laminating the base film 12 on the PVA resin film 11, methods such as thermal fusion, ultrasonic fusion, and laser fusion are exemplified. In the present application, the base film "directly laminated" on the surface of the PVA resin film includes a case where a PVA resin film and a base film are separately prepared and bonded so as to directly contact them without interposing other layers.

The laminated body 15 of this embodiment can also be made into a material for manufacturing a polarizing plate similarly to the laminated body 10 of Embodiment 1.

[Polarizer]

Hereinafter, the polarizing plate 150 of the present invention manufactured using the laminate 15 of the present embodiment will be described. The polarizing plate 150 is obtained by uniaxially stretching the laminate 10 of the present embodiment.

As shown in FIG. 8, in the polarizing plate 150, the base film 112 is directly laminated on one side (the upper side of the illustration) 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.

[Effect of this embodiment]

In this embodiment, as in the polarizing plate of the first embodiment, a laminate comprising a PVA resin film having a small in-plane retardation Re1 and a thin thickness, and a base film comprising a flexible resin capable of stretching at a high magnification at low temperatures Since the polarizing plate 150 is manufactured by extending|stretching, it has the same effect as Example 1.

In addition, according to the present embodiment, since a laminate in which the base film 12 is directly laminated on the PVA resin film 11 is used, the rupture suppression effect is excellent, and environmental pollution caused by other substances in the production environment is prevented. It also has the effect of preventing or preventing conformation to the product (incorporating foreign substances).

[Modified Example 3]

Hereinafter, a polarizing plate 160 of Modified Example 3 manufactured using the laminate 15 according to the second embodiment of the present invention will be described with reference to FIG. 9. 9 is a cross-sectional view schematically showing a polarizing plate 160 of Modification Example 3 manufactured using the laminate according to the second embodiment of the present invention.

In the polarizing plate 160, as shown in FIG. 9, the base film 112 is laminated on one side (the upper side of the illustration) of the PVA resin film 111, and the other side of the PVA resin film 111 The protective film 115 is laminated on the (lower side of the figure) through the adhesive layer 114. As the adhesive 114 for attaching the protective film 115 to the PVA resin film 111, the same adhesive as the adhesive for attaching the base film to the PVA resin film described in the first embodiment can be used.

The manufacturing method of the polarizing plate 160 according to this example includes a step of bonding the protective film 115 to the PVA resin film 111 of the polarizing plate 150 obtained in Embodiment 2 via an adhesive. The method of bonding the protective film 115 and the protective film is the same as in Modification Example 1.

Like the polarizing plate of Embodiment 1, the polarizing plate 160 of this example also includes a PVA resin film having a small in-plane retardation Re1 and a thin thickness, and a base film made of a flexible resin capable of high magnification stretching at low temperatures. Since a polarizing plate is manufactured by extending|stretching a laminated body, it has the same function and effect as Embodiment 1.

In addition, according to this example, since the laminate 15 in which the base film 12 is directly laminated on the PVA resin film 11 is used, the rupture suppression effect is excellent, and the environment caused by other substances in the production environment It also has the effect of preventing contamination and preventing contamination to products (incorporating foreign substances).

In addition, according to this example, since the protective film 115 is provided on the side of the PVA resin film 111 on the side where the base film 112 is not laminated, scratches, etc., are generated on the surface of the PVA resin film 111. It also exerts the effect of preventing it.

[Modified Example 4]

Hereinafter, a polarizing plate 170 of Modification Example 4 manufactured using the laminate 15 according to the second embodiment of the present invention will be described with reference to FIG. 10. 10 is a cross-sectional view schematically showing a polarizing plate 170 of Modification Example 4 manufactured using the laminate according to the second embodiment of the present invention.

In the polarizing plate 170, as shown in FIG. 10, the base film 112 is laminated on one side (the upper side of the illustration) of the PVA resin film 111, and the other side of the PVA resin film 111 The pressure-sensitive adhesive layer 116 is laminated on the (lower side of the figure).

The manufacturing method of the polarizing plate 170 according to this example includes a step of forming the pressure-sensitive adhesive layer 116 on the PVA resin film 111 of the polarizing plate 150 obtained in the second embodiment.

The method of forming the pressure-sensitive adhesive layer 116 and the pressure-sensitive adhesive used for forming the pressure-sensitive adhesive layer 116 are the same as those of the second modification.

Like the polarizing plate of Embodiment 1, the polarizing plate 170 of this example also includes a PVA resin film having a small in-plane retardation Re1 and a thin thickness, and a base film made of a flexible resin capable of high-magnification stretching at low temperatures. Since a polarizing plate is manufactured by extending|stretching a laminated body, it has the same function and effect as Embodiment 1.

In addition, according to this example, since the laminate 15 in which the base film 12 is directly laminated on the PVA resin film 11 is used, the rupture suppression effect is excellent, and the environment caused by other substances in the production environment It also has the effect of preventing contamination and preventing contamination to products (incorporating foreign substances).

In addition, according to this example, since the pressure-sensitive adhesive layer 116 is provided on the side of the PVA resin film 111 on the side on which the base film 112 is not laminated, scratches or the like occur on the surface of the PVA resin film 111 It also exerts the effect of preventing it.

[Embodiment 3: Display device]

A polarizing plate manufactured by using the laminate for a polarizing plate of the present invention can be a material for a liquid crystal display device.

Usually, a liquid crystal display device includes a light source, a light source-side polarizing plate, a liquid crystal cell, and a viewing-side polarizing plate in this order, but the polarizing plate obtained by the present invention may be used in any of the light-source-side polarizing plate and the viewing-side polarizing plate.

As a driving method of the liquid crystal cell, for example, in-plane switching (IPS) mode, vertical alignment (VA) mode, multi-domain vertical alignment (MVA) mode, continuous pinwheel alignment (CPA) mode, hybrid alignment nematic ( HAN) mode, twisted nematic (TN) mode, super twisted nematic (STN) mode, optical compensated bend (OCB) mode, and the like.

Hereinafter, a display device 400 according to Embodiment 3 including a polarizing plate 100 manufactured using the laminate 10 of the present invention will be described with reference to FIG. 11. The display device 400 of this embodiment is manufactured by laminating the polarizing plate 100 of the first embodiment as a light source-side polarizing plate and a viewing-side polarizing plate on a liquid crystal panel, respectively.

11 is a cross-sectional view schematically showing a display device 400 according to a third embodiment of the present invention. As shown in FIG. 11, the display device 400 is disposed outside the two substrates 410 and 420, the liquid crystal layer 430 positioned therebetween, and the two substrates 410 and 420, respectively. It has a polarizing plate (100, 100). The two polarizing plates 100 are polarizing plates 100 manufactured using the laminated body 10 of the first embodiment. As shown in FIG. 11, two polarizing plates 100 are laminated so that the base film 112 of a polarizing plate may be arrange|positioned between the PVA resin film 111 of a polarizing plate, and the liquid crystal layer 430, respectively.

According to this embodiment, the base film can be used also as a protective film, and a display device provided with a polarizing plate that can be efficiently manufactured even if the thickness is thin can be provided.

[Embodiment 4: Display device]

A display device 450 according to a fourth embodiment including a polarizing plate of the present invention will be described with reference to FIG. 12. 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 laminating the polarizing plate on a liquid crystal panel.

12 is a cross-sectional view schematically showing a display device 450 according to a fourth embodiment of the present invention. As shown in FIG. 12, the display device 450 includes two substrates 410 and 420, a liquid crystal layer 430 positioned therebetween, and an outer surface of the lower substrate 410 (lower side shown). It has a polarizing plate 120 disposed on. The polarizing plate 120 is a polarizing plate of Modification Example 1. As shown in FIG. 12, the polarizing plate 120 is laminated so that the base film 112 of a polarizing plate may be arrange|positioned between the PVA resin film 111 of a polarizing plate, and the liquid crystal layer 430.

According to this embodiment, the base film can be used also as a protective film, and the manufacturing method of the display device provided with the polarizing plate of this invention which can manufacture efficiently even if it is thin can be provided.

[Embodiment 5: Display device]

The display device 460 according to the fifth embodiment including the polarizing plate 160 of the present invention will be described with reference to FIG. 13. 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 laminating the polarizing plate on a liquid crystal panel.

13 is a cross-sectional view schematically showing a display device 460 according to a fifth embodiment of the present invention. As shown in FIG. 13, the display device 460 includes two substrates 410 and 420, a liquid crystal layer 430 positioned therebetween, and an outer surface of the lower substrate 410 (lower side shown). It has a polarizing plate 160 disposed on. The polarizing plate 160 is a polarizing plate of Modification Example 3. As shown in FIG. 13, the polarizing plate 160 is laminated so that the base film 112 of a polarizing plate may be arrange|positioned between the PVA resin film 111 of a polarizing plate, and the liquid crystal layer 430.

According to this embodiment, the base film can be used also as a protective film, and the manufacturing method of the display device provided with the polarizing plate of this invention which can manufacture efficiently even if it is thin can be provided.

[Embodiment 6: Display device]

The polarizing plate produced by using the laminate for polarizing plates of the present invention can be a material for an EL display device.

Usually, an organic EL display device is provided with a substrate, a transparent electrode, a light emitting layer, and a metal electrode layer in order from the light emitting side, and the polarizing plate obtained by the manufacturing method of the present invention is disposed on the light emitting side of the substrate.

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

Hereinafter, a display device 500 according to Embodiment 6 including a polarizing plate manufactured using the laminate 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 laminating the polarizing plate 100 of the present invention on an organic EL panel.

14 is a cross-sectional view schematically showing a display device 500 according to a sixth embodiment of the present invention. The display device 500 includes two substrates 510 and 520, a light emitting layer 530 positioned therebetween, and a polarizing plate 100 disposed on an outer surface (lower side of the illustration) of the lower substrate 510 Has. The polarizing plate 100 is a polarizing plate according to the first embodiment. As shown in FIG. 14, the polarizing plate 100 is laminated so 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, a base film can be used also as a protective film, and a display device provided with the polarizing plate of the present invention can be provided which can be efficiently produced even if the thickness is small.

[Embodiment 7: Display device]

A display device 550 according to Embodiment 7 including a polarizing plate manufactured using the laminate of the present invention will be described with reference to FIG. 15. The display device 550 of this embodiment is manufactured by laminating the polarizing plate 120 of the present invention on an organic EL panel.

15 is a cross-sectional view schematically showing a display device 550 according to Embodiment 7 of the present invention. The display device 550 includes two substrates 510 and 520, a light emitting layer 530 positioned therebetween, and a polarizing plate 120 disposed on an outer surface (lower side of the illustration) of the lower substrate 510 Has. The polarizing plate 120 is a polarizing plate of Modification Example 1. As shown in FIG. 15, the polarizing plate 120 is laminated so that the base film 112 of the polarizing plate 120 is disposed between the PVA resin film 111 of the polarizing plate 120 and the light emitting layer 530.

According to this embodiment, a base film can be used also as a protective film, and a display device provided with the polarizing plate of the present invention can be provided which can be efficiently produced even if the thickness is small.

[Embodiment 8: Display device]

A display device 560 according to Embodiment 8 including a polarizing plate manufactured using the laminate of the present invention will be described with reference to FIG. 16. The display device 560 of this embodiment is manufactured by laminating the polarizing plate 160 of the present invention on an organic EL panel.

16 is a cross-sectional view schematically showing a display device 560 according to Embodiment 8 of the present invention. The display device 560 includes two substrates 510 and 520, a light emitting layer 530 positioned therebetween, and a polarizing plate 160 disposed outside the lower substrate 510 (shown below). The polarizing plate 160 is a polarizing plate of Modification Example 3. As shown in FIG. 16, the polarizing plate 160 is laminated so that the base film 112 of the polarizing plate 160 is disposed between the PVA resin film 111 of the polarizing plate 160 and the light emitting layer 530.

According to this embodiment, a base film can be used also as a protective film, and a display device provided with the polarizing plate of the present invention can be provided which can be efficiently produced even if the thickness is small.

[Other embodiments]

(1) In Embodiment 3, it was shown that the polarizing plate of Embodiment 1 was used for each of the light source-side polarizing plate and the viewer-side polarizing plate, but either polarizing plate may be constituted by another polarizing plate, and the polarizing plate of Embodiment 2 or Modified Example 1 You may use two polarizing plates of ~4.

(2) In Embodiments 4 and 5, the polarizing plate of Modified Example 1 and the polarizing plate of Modified Example 3 are used for one of the light source side polarizing plate and the viewer side polarizing plate, respectively, but Embodiment 1, Embodiment 2 and Modified Example 2 Alternatively, the polarizing plate of Modification Example 4 may be used.

(3) In the sixth to eighth embodiments, examples in which the polarizing plate of the first embodiment, the polarizing plate of the modified example 1, and the polarizing plate of the modified example 3 were respectively used for the organic EL display device, but are not limited thereto. For example, the polarizing plate of Embodiment 2, the polarizing plate of Modified Example 2, or the polarizing plate of Modified Example 4 may be used, or the polarizing plate of the present invention may be used for an inorganic EL display device.

Example

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited to the following Examples. In the following, "parts" and "%" related to the amount ratio of components represent parts by weight unless otherwise stated.

[Assessment Methods]

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

The molecular weights of the block copolymer and the block copolymer hydride were measured at 38°C as standard polystyrene conversion values by GPC using THF as an eluent. As a measuring device, HLC8020GPC manufactured by Tosoh Corporation was used.

[Hydrogenation rate]

The hydrogenation rate of the block copolymer hydride was calculated by ¹ H-NMR spectrum or GPC analysis. A region with a hydrogenation rate of 99% or less was calculated by measuring a ¹ H-NMR spectrum, and a region exceeding 99% was calculated from the ratio of the peak area by the UV detector and the RI detector by GPC analysis.

[Measurement of MFR (melt flow rate measured at 190℃, load 2.16kg)]

The melt flow rate is based on JIS K7210, using an extrusion-type plastometer (manufactured by Tateyama Scientific Industries, Ltd., brand name "melt indexer (L240)") as a measuring device, under conditions of a temperature of 190°C and a load of 2.16 kg. Measured.

[Measurement of tensile modulus]

The tensile modulus of elasticity was measured by the following method using a tensile tester (manufactured by Instron Japan Company Limited, brand name "electromechanical universal testing machine (5564)") based on JIS K7127.

The base film was punched in the shape of a test piece type 1B based on JIS K7127, and the stress when the test piece was pulled in the long side direction and deformed was measured. The stress measurement conditions were 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 the stress was performed 5 times. From the measured stress and the measurement data of the strain corresponding to the stress, 4 points of measurement data per 0.2% (i.e., the strain is 0.6%, 0.8%, 1.0%, and the strain of the test piece is 0.6% to 1.2%) Measurement data at the time of 1.2%) was selected, and the tensile modulus was calculated using the least squares method from 4 points of measurement data (20 points in total) of 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 stretched material of the base film, and the retardation in the in-plane direction of the base film in the polarizing plate are determined by a retardation meter (manufactured by Opto Science Co., Ltd., brand name ``Muller Matrix -Measured using a polar limiter (Axo Scan)"). During measurement, the measurement wavelength was set to 550 nm.

The phase difference in the in-plane direction of the base film that occurs when the laminate is uniaxially stretched at the free end by 6.0 times under the temperature condition of 50°C, and the base material generated when the free end is uniaxially stretched by 6.0 times under the temperature condition of 120°C. If both of the retardation in the in-plane direction of the film are in the range of 0 nm to 20 nm, the retardation in the in-plane direction of the base film occurs when the laminate is uniaxially stretched at a free end of 6.0 under a temperature condition of 50°C to 120°C. It was determined that Re2 was 0 nm or more and 20 nm or less.

[Measurement method of thickness]

The thickness of each film (polyvinyl alcohol resin film and base film) included in the laminate and the thickness of each film included in the polarizing plate are measured by a thickness meter (manufactured by Mitsutoyo Corporation, brand name ``ABS Digimatic Thickness Gauge (547-)). 401)") was used to measure 5 times, and the average value was taken as the thickness of each film.

[Evaluation of adhesion]

In the process up to the second stretching treatment in the manufacture of the polarizing plate of each example, A was taken as the one that did not occur between the polyvinyl alcohol resin film and the base film, B was seen as peeling on a part, and C was completely peeled off. .

[Evaluation of drying fairness]

In the drying process at 70°C for 5 minutes in the manufacture of the polarizing plate of each example, the one where no crack was generated in the polarizer was set as A, and the one with occurrence of the crack was set as C.

[Black color shift]

The liquid crystal display panel was removed from the liquid crystal display device (manufactured by LG Electronics Japan, brand name ``IPS panel monitor (23MP47)''), the polarizing plate disposed on the viewer side was peeled off, and the polarizing plates produced in Examples and Comparative Examples were removed. , The base film was bonded to be the panel side. Further, a single polarizer without a protective film was attached to the side of the polarizing plate produced in Examples and Comparative Examples to reassemble the liquid crystal display device. The absorption axes of the polarizing plate produced in Examples and Comparative Examples and the polarizer alone without a protective film were bonded to be in the same direction as the absorption axis of the polarizing plate before peeling.

When the direction of the absorption axis of the polarizing plate arranged on the viewer side is 0° in azimuth and 0° in the vertical direction of the panel, the panel is displayed in black (ie, black is displayed on the entire display screen of the panel). Thus, visually viewed from an azimuth of 45° and an azimuth of 45°, it was determined that A was the same as that of a polarizer without a protective film, B was a slight color change, and C was a large change.

[Example 1]

(1-1) Preparation of polymer X

Referring to the preparation example described in Japanese Patent Application Laid-Open No. 2002-105151, after polymerizing 25 parts of styrene monomer in the first step, 30 parts of styrene monomer and 25 parts of isoprene monomer are polymerized in the second step, and then in the third step. After polymerizing 20 parts of a styrene monomer to obtain a block copolymer [D1], the block copolymer was hydrogenated to synthesize a block copolymer hydride [E1]. Mw of the block copolymer hydride [E1] was 84,500, Mw/Mn was 1.20, and the hydrogenation rate of the main chain and the aromatic ring was approximately 100%.

To 100 parts of block copolymer hydride [E1], pentaerythrityl tetrakis[3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate] (Matsubara Industrial Co., Ltd.) as an antioxidant Production, product name "Songnox1010") 0.1 part was melt-kneaded and blended, and then it was made into pellets to obtain a polymer X for molding.

(1-2) Preparation of base film

After dissolving the polymer X prepared in (1-1) in cyclohexane, 40 parts by weight of polyisobutene (``Nisseki Polybutene HV-300'' manufactured by JX Nikko-Niseki Energy Co., Ltd.), based on 100 parts by weight of the polymer X An average molecular weight of 1,400) and 0.1 parts by weight of an organosilicon compound (3-aminopropyltriethoxysilane, KBM903, manufactured by Shin-Etsu Chemical Co., Ltd.) were added to prepare a coating liquid for cast film formation.

The obtained coating liquid for film formation was applied and dried on a separator film (manufactured by Mitsubishi Chemical Corporation, "MRV38") using a die coater. Thereby, a long base film containing polymer X having 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 min, and the tensile modulus was 600 MPa.

(1-3) Preparation of laminate

100 parts by weight of water, 3 parts by weight of a polyvinyl alcohol adhesive ("Z-200" manufactured by Nippon Synthetic Chemical Co., Ltd.), and 0.3 parts by weight of a crosslinking agent ("SPM-01" manufactured by Nippon Synthetic Chemical Co., Ltd.) were mixed to obtain an adhesive. This adhesive was applied to one side of the base film prepared in (1-2), and an unstretched polyvinyl alcohol resin film (average polymerization degree of about 2400, saponification degree of 99.9 mol%, width of 650 mm, thickness of 20 μm, or less) Also referred to as "PVA20") was bonded. In this state, the adhesive was heated and dried at 70° C. for 5 minutes to obtain a laminate.

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

(1-4) Preparation of polarizing plate

The following operation was performed while continuously conveying the laminated body manufactured in (1-3) in the longitudinal direction through a guide roll.

The above-described laminate was subjected to a swelling treatment by immersing in water, a dyeing treatment by immersing in a dyeing solution containing iodine and potassium iodide, and a first stretching treatment of stretching the laminate after the dyeing treatment. Next, a second stretching treatment was performed in which the laminate after the first stretching treatment was stretched in a bath containing boric acid and potassium iodide. The total draw ratio represented by the product of the draw ratio in the first stretching treatment and the draw ratio in the second stretching treatment was set to be 6.0. The laminate after the second stretching treatment was dried in a dryer at 70° C. for 5 minutes (drying step) to obtain a polarizing plate.

In the steps up to the second stretching treatment, adhesion was evaluated, in the drying step, drying fairness was evaluated, and the obtained polarizing plate was evaluated for black color shift. Table 1 shows the evaluation results.

Further, the thickness and retardation of the base film in the obtained polarizing plate, and the thickness of the polyvinyl alcohol resin film were measured. Table 1 shows the measurement results.

[Example 2]

In (1-2) of Example 1, instead of 0.1 parts by weight of an organosilicon compound, 0.1 parts by weight of an organic titanium compound (tetraisopropyl titanate, Orgatics TA-8, manufactured by Matsumoto Fine Chemicals) was obtained. Except having used the base film, it carried out similarly to Example 1, the laminated body and the polarizing plate were produced, and evaluation was performed in the same manner as in Example 1. Table 1 shows the results.

[Example 3]

In (1-2) of Example 1, instead of 0.1 parts by weight of an organosilicon compound, 0.1 parts by weight of an organic zirconium compound (normal propyl zirconate, Orgatics ZA-45, manufactured by Matsumoto Fine Chemicals) was obtained. Except having used the base film, it carried out similarly to Example 1, the laminated body and the polarizing plate were produced, and evaluation was performed in the same manner as in Example 1. Table 1 shows the results.

[Example 4]

In Example 1 (1-2), when performing the operation of applying and drying the film-forming coating liquid to the separator film using a die coater, the coating amount and the like were adjusted, and a long base film having a thickness of 5 μm ( The width and length were the same as in Example 1), except for producing a laminated body and a polarizing plate in the same manner as in Example 1, and evaluated in the same manner as in Example 1. Table 1 shows the results.

[Example 5]

In Example 1 (1-2), except not using polyisobutene, a laminate and a polarizing plate were produced in the same manner as in Example 1, and evaluation was performed in the same manner as in Example 1. The results are shown in Table 2. The MFR of the base film used in Example 5 was 3 g/10 min, and the tensile modulus was 800 MPa.

[Example 6]

In Example 1 (1-2), when performing the operation of applying and drying the one without using the organosilicon compound and the film-forming coating liquid on the separator film using a die coater, the amount of coating, etc., was adjusted. , In the same manner as in Example 1, except that a long base film having a thickness of 5 μm (width and length were the same as in Example 1), a laminate and a polarizing plate were prepared, and evaluation was performed in the same manner as in Example 1. Done. The results are shown in Table 2.

[Comparative Example 1]

As a result of performing the same operation as in (1-4) in (1-4) of Example 1, using only the unstretched polyvinyl alcohol resin film (PVA20) instead of the laminate produced in (1-3) , In the first stretching treatment and the second stretching treatment, the fusing occurred frequently, and in the drying step, the fusing occurred frequently, and the adhesion and the black color shift could not be evaluated.

[Comparative Example 2]

In (1-3) of Example 1, instead of the base film produced in (1-2), a cycloolefin-based resin film having an elastic modulus of 2300 MPa (Zeonoa film, manufactured by Nippon Xeon, thickness 13 μm, temperature 190°C, A laminate was produced in the same manner as in Example 1, except that MFR at a load of 2.16 kg was not measured). As a result of performing the same operation as in Example 1 (1-4) using the laminate, fracture occurred in the first stretching treatment, and a polarizing plate could not be produced.

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

In the table, "COP" means a cycloolefin resin.

In the table, "Re2 (50°C)" refers to the phase difference in the in-plane direction of the base film that occurs when the laminate is uniaxially stretched at a free end of 6.0 times under a temperature condition of 50°C, and "Re2 (120°C)" Means a phase difference in the in-plane direction of the base film generated when the laminate is uniaxially stretched at a free end of 6.0 times under a temperature condition of 120°C.

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

From the results of Tables 1 and 2, according to the present invention, it is possible to reduce the retardation expressed in the base film after the step of stretching the laminate, and to obtain a polarizing plate excellent in adhesion, drying processability and optical properties. Able to know. Thereby, it was found that the base film can also be used as a protective film, and a laminate for a polarizing plate that can be efficiently produced even if the thickness is thin, a polarizing plate and a display device using the laminate, and a method for producing a polarizing plate can be provided. have.

10, 15... Laminate (Laminate for Polarizing Plates)
11... Polyvinyl alcohol resin film (PVA resin film)
12... Base film
13... Adhesive layer
100, 120, 130, 150, 160, 170... Polarizer
111... Polyvinyl alcohol resin film (PVA resin film)
112... Base film
113, 114... Adhesive layer
115... Protective film
116... Adhesive layer
200… Manufacturing device
201, 202... Unwinding device
203... Winding device
205... Bonding device
300… Manufacturing device
301, 307... Unwinding device
302 to 305... Processing unit
306, 309... Drying device
308... Bonding device
310... Winding device
400, 450, 460... Display device (liquid crystal display device)
410, 420... Board
430... Liquid crystal layer
500, 550, 560... Display device (organic EL display device)
510, 520... Board
530... Emitting layer

Claims (15)

As a laminate for a polarizing plate comprising an unstretched polyvinyl alcohol resin film and a base film,
The polyvinyl alcohol resin film has a retardation Re1 of 50 nm or less in the in-plane direction, and a thickness T of 45 μm or less,
The base film is a film made of a resin,
The resin has a melt flow rate of 1 g/10 min or more, and the melt flow rate is a value measured at 190°C and a load of 2.16 kg,
The resin has a tensile modulus E of 50 MPa or more and 1200 MPa or less,
The retardation Re2 in the in-plane direction of the stretched material of the base film is 0 nm or more and 20 nm or less, and the retardation Re2 is the free end uniaxial stretching of the laminate for polarizing plate at 6.0 times under a temperature condition of 50°C to 120°C, and the base material A laminate for a polarizing plate which is a retardation of the stretched product when the film is used as the stretched product. The method of claim 1,
The resin is a cycloolefin resin,
The cycloolefin-based resin contains a cycloolefin-based polymer,
The cycloolefin polymer is a polymer block [A] containing as a main component a repeating unit [I] derived from an aromatic vinyl compound,
A polymer block [B] containing as main components a repeating unit [I] derived from an aromatic vinyl compound and a repeating unit [II] derived from a chain conjugated diene compound, or a repeating unit [II] derived from a chain conjugated diene compound as a main component Polymer block [C]
A block copolymer [D] consisting of
A laminate for a polarizing plate, which is a hydrogenated block copolymer hydride. As a laminate for a polarizing plate comprising an unstretched polyvinyl alcohol resin film and a base film,
The polyvinyl alcohol resin film has a retardation Re1 of 50 nm or less in the in-plane direction, and a thickness T of 45 μm or less,
The base film is a film made of a resin,
The resin is a cycloolefin resin,
The cycloolefin-based resin contains a cycloolefin-based polymer,
The cycloolefin polymer is a polymer block [A] containing as a main component a repeating unit [I] derived from an aromatic vinyl compound,
A polymer block [B] containing as main components a repeating unit [I] derived from an aromatic vinyl compound and a repeating unit [II] derived from a chain conjugated diene compound, or a repeating unit [II] derived from a chain conjugated diene compound as a main component Polymer block [C]
A block copolymer [D] consisting of
It is a hydrogenated block copolymer hydride,
The retardation Re2 in the in-plane direction of the stretched material of the base film is 0 nm or more and 20 nm or less, and the retardation Re2 is the free end uniaxial stretching of the laminate for polarizing plate at 6.0 times under a temperature condition of 50°C to 120°C, and the base material A laminate for a polarizing plate which is a retardation of the stretched product when the film is used as the stretched product. The method according to claim 2 or 3,
A laminate for a polarizing plate, wherein the cycloolefin resin contains a plasticizer, a softener, or both. The method of claim 4,
A laminate for a polarizing plate, wherein the plasticizer, the softener, or both are at least one selected from an ester plasticizer and an aliphatic hydrocarbon polymer. The method according to any one of claims 1 to 5,
The laminated body for polarizing plates in which the said resin contains an organometallic compound. The method according to any one of claims 1 to 6,
The said base film is laminated|stacked on the said polyvinyl alcohol resin film through an adhesive layer, and the laminated body for polarizing plates. A polarizing plate obtained by uniaxially stretching the laminate for polarizing plates according to any one of claims 1 to 7. The method of claim 8,
A polarizing plate having a protective film or a pressure-sensitive adhesive on the surface of the polyvinyl alcohol resin film of the polarizing plate on which the base film is not laminated. The method of claim 9,
The polarizing plate, wherein the protective film is made of at least one resin selected from a cycloolefin resin, an acrylic resin, a polyethylene terephthalate resin, and a triacetylcellulose resin. Two substrates, a liquid crystal layer positioned between them,
A display device comprising the polarizing plate according to any one of claims 8 to 10, which is disposed outside at least one of the two substrates. Two substrates, a light-emitting layer positioned therebetween,
A display device comprising the polarizing plate according to any one of claims 8 to 10, which is disposed outside one of the two substrates. The method of claim 11,
A display device in which 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 method of claim 12,
A display device in which 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 for producing a polarizing plate, including the step of uniaxially stretching the laminate for polarizing plates according to any one of claims 1 to 7.

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