TW201837501A - Polarization plate with anti-reflection layer and anti-glare layer and manufacturing method thereof comprising a polarizing plate having a polarizing element and a protective layer, an anti-glare layer, an anti-glare layer substrate, an anti-reflection layer substrate, and an anti-reflection layer directly formed on the anti-reflection layer substrate - Google Patents

Abstract

The present invention provides a polarization plate with anti-reflection layer and anti-glare layer that is capable of suppressing peeling and wrinkling of the anti-glare layer even in a high temperature and high humidity environment and a manufacturing method thereof. The polarization plate with anti-reflection layer and anti-glare layer according to the present invention comprises: a polarizing plate having a polarizing element and a protective layer arranged on one side of the polarizing element, an alignment solidification layer of liquid crystal compounds, which is an anti-glare layer, attached to the protective layer, an anti-glare layer substrate, an anti-reflection layer substrate attached to the anti-glare layer substrate, and an anti-reflection layer directly formed on the anti-reflection layer substrate. In an embodiment of the present invention, the anti-reflection layer substrate has a moisture content that is more than 2.0wt%.

Description

Polarizing plate with anti-reflection layer and anti-glare layer and manufacturing method thereof

The invention relates to a polarizing plate with an anti-reflection layer and an anti-glare layer, and a manufacturing method thereof.

An image display device (for example, a liquid crystal display device, an organic EL display device, or a quantum dot display device) has a polarizing plate disposed on at least one side of a display unit in many cases because of its image forming method. It is known that an anti-reflection layer (an anti-reflection treatment is performed) and / or an anti-glare layer is provided on a viewing side of a polarizing plate arranged on a viewing side of an image display device in order to prevent reflection of external light onto a display screen. The anti-glare layer typically includes a matrix of a resin or an adhesive and fine particles dispersed in the matrix. However, in recent years, with the demand for thinning of image display devices, the industry has also strongly demanded the thinning of polarizing plates. Along with this, the thickness of the anti-glare layer has also been required. As a result, an anti-glare layer as an alignment cured layer of a liquid crystal compound was studied. However, such an anti-glare layer is liable to be peeled off in a high-temperature and high-humidity environment, and wrinkles are liable to occur. [Prior Art Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. 2011-191428

[Problems to be solved by the invention]

The present invention has been made in order to solve the above-mentioned problems, and a main object thereof is to provide a polarizing plate with an anti-reflection layer and an anti-glare layer that suppresses peeling and wrinkling of the anti-glare layer even in a high-temperature and high-humidity environment. [Technical means to solve the problem]

The polarizing plate with an anti-reflection layer and an anti-glare layer of the present invention includes a polarizing plate having a polarizing element and a protective layer provided on one side of the polarizing element, and an alignment curing layer of a liquid crystal compound adhered to the protective layer. Anti-glare layer, base material for anti-glare layer, base material for anti-reflection layer bonded to base material for anti-glare layer, and anti-reflection layer formed directly on base material for anti-reflective layer, the anti-reflection The moisture content of the substrate for the layer is 2.0% by weight or more. In one embodiment, regarding the polarizing plate with the anti-reflection layer and the anti-glare layer, the dimensional change rate of the substrate for the anti-reflection layer after being kept at 65 ° C. and 90% RH for 24 hours did not reach 0.03%. In one embodiment, the in-plane retardation Re (550) of the anti-glare layer is 220 nm to 320 nm. In one embodiment, the polarizing plate with an anti-reflection layer and an anti-glare layer further includes an alignment film between the anti-glare layer and the base material for the anti-glare layer, and the alignment film includes a polyvinyl alcohol resin. According to another aspect of the present invention, a method for manufacturing the above-mentioned polarizing plate with an anti-reflection layer and an anti-glare layer is provided. The manufacturing method includes the following steps: manufacturing a polarizing element laminate including a polarizing element and a protective layer; forming an anti-reflection layer on an anti-reflection layer substrate to produce an anti-reflection laminated body; and forming an anti-glare on the anti-glare layer substrate An anti-glare laminated body is produced; and the polarizing element laminated body, the anti-glare laminated body and the anti-reflection laminated body are bonded together; the moisture content of the base material for the anti-reflection layer is 2.0% by weight or more. In one embodiment, the substrate for the antireflection layer is subjected to a humidification treatment. [Effect of the invention]

According to the present invention, by setting the moisture content of the base material for an anti-reflection layer in a polarizing plate with an anti-reflection layer and an anti-glare layer to 2.0% by weight or more, the anti-glare layer can be suppressed even in a high-temperature and high-humidity environment. Peeling and wrinkling polarizing plate with anti-reflection layer and anti-glare layer.

Hereinafter, embodiments of the present invention will be described, but the present invention is not limited to these embodiments.

A. Overall structure of polarizing plate with anti-reflection layer and anti-glare layer FIG. 1 is a schematic cross-sectional view of a polarizing plate with anti-reflection layer and anti-glare layer according to an embodiment of the present invention. The polarizing plate 100 with an anti-reflection layer and an anti-glare layer is sequentially provided with: a polarizing plate 10 having a polarizing element 11 and a protective layer 12, an anti-glare layer 40, a base material 50 for an anti-glare layer, a base material 20 for an anti-reflective layer,和 Anti-reflective layer 30. The anti-glare layer 40 is typically bonded to the protective layer 12 of the polarizing plate 10 via any appropriate adhesive layer (adhesive layer, adhesive layer: not shown). The subsequent layer is typically an acrylic adhesive layer. The anti-glare layer 40 is an alignment cured layer of a liquid crystal compound. The "alignment-cured layer" in this specification refers to a layer in which a liquid crystal compound is aligned in a specific direction in a layer, and the alignment state is fixed. Furthermore, the "alignment-cured layer" includes the concept of an alignment-hardened layer obtained by curing a liquid crystal monomer. The anti-glare layer 40 is typically coated with a composition containing a liquid crystal compound on the surface of an alignment film (not shown) formed on the substrate 50 for the anti-glare layer, and the coating layer is cured and / or hardened. And formed. The antireflection layer 30 is directly formed on the base material 20 for the antireflection layer. The term "directly" as used in this specification means not interposing the adhesive layer. In one embodiment, the base material 20 for the anti-reflection layer may have a hard coat layer and / or an adhesion layer (neither of which is shown) on the surface of the anti-reflection layer 30 side. This configuration is also included in the form of "the antireflection layer is formed directly on the substrate". An anti-fouling layer (not shown) may be provided on the surface of the anti-reflection layer 30 as needed.

In the embodiment of the present invention, the moisture content of the base material 20 for the antireflection layer is 2.0% by weight or more, preferably 2.4% by weight or more, more preferably 2.7% by weight or more, and further preferably 3.0% by weight or more, particularly It is preferably 3.5% by weight or more. The upper limit of the moisture content of the base material for the antireflection layer is, for example, 5.0% by weight. By making the base material for the anti-reflection layer have such a high moisture content, it is possible to suppress peeling and wrinkling of the anti-glare layer (alignment-cured layer of the liquid crystal compound) under a high temperature and high humidity environment. The “moisture content of the base material for the antireflection layer” in this specification refers to the moisture content of the base material for the antireflection layer when the antireflection laminate is bonded in the manufacturing method described in item I below.

The moisture content of the polarizing plate 10 is preferably 0.5% by weight or more, more preferably 0.6% by weight or more, more preferably 0.8% by weight or more, and even more preferably 1.0% by weight or more. The upper limit of the moisture content of a polarizing plate is 2.0 weight%, for example. By having such a high moisture content of the polarizing plate, it is possible to significantly suppress the hygroscopic expansion of the polarizing plate. As a result, it is possible to significantly suppress the dimensional change of the polarizing plate (especially the dimensional change of the polarizing element in the absorption axis direction) in a high temperature and high humidity environment. With the synergistic effect of this effect and the effect obtained by the moisture content band of the above-mentioned base material for the anti-reflection layer, the polarizing plate with the anti-reflection layer and the anti-glare layer according to the embodiment of the present invention can further suppress high temperature and high Peeling and wrinkling of the anti-glare layer (alignment-cured layer of liquid crystal compound) in a wet environment. Furthermore, by making the polarizing plate have such a high moisture content, the polarizing plate with an anti-reflection layer and an anti-glare layer according to the embodiment of the present invention assumes curling even in a high-temperature and high-humidity environment. Usually the opposite direction. As a result, even if the polarizing plate with an anti-reflection layer according to the embodiment of the present invention is assumed to be curled, the adverse effect on the image display device can be reduced. In this way, through the synergistic effect of the suppression of the dimensional change and the curling direction obtained due to the higher moisture content of the polarizing plate, the polarizing plate with an anti-reflection layer and an anti-glare layer can be significantly applied to an image display device. In order to suppress warpage, peeling, and / or degradation of display characteristics in a high temperature and high humidity environment.

In the example shown in the figure, a protective layer 12 is provided only on one side of the polarizing element 11, but another protective layer may be provided on the opposite side of the protective layer 12 depending on the purpose. In this case, a protective layer may be provided on both sides of the polarizing element, or the protective layer 12 may be omitted and only another protective layer may be provided. When only another protective layer is provided, the base material 50 for an anti-glare layer can function as a visible-side protective layer. Furthermore, any appropriate functional layer may be provided depending on the purpose. Examples of the functional layer include a retardation layer and a conductive layer. The type, number, combination, arrangement position, and characteristics of the functional layer (such as optical characteristics such as refractive index characteristics, in-plane phase difference, thickness direction phase difference, and Nz coefficient) can be appropriately set depending on the purpose. In one embodiment, a first retardation layer (not shown) having a refractive index characteristic of nx> ny> nz may be provided on the opposite side of the polarizer 11 from the protective layer 12. In this case, it is preferable that a second retardation layer having a refractive index characteristic of nz> nx> ny may be further provided on the opposite side of the first retardation layer from the polarizing element. The first retardation layer may also serve as a protective layer on the side opposite to the viewing side of the polarizer. Furthermore, a conductive layer may be provided on the polarizing element 11 on the side opposite to the protective layer 12. By providing a conductive layer at such a position, a polarizing plate with an anti-reflection layer and an anti-glare layer can be suitably used for a built-in touch panel type input display device. In this case, the retardation layer may or may not exist.

Hereinafter, the constituent elements of a polarizing plate with an anti-reflection layer and an anti-glare layer will be described.

B. Polarizing plate B-1. Polarizing element The polarizing element 11 is typically composed of a resin film containing a dichroic material.

As the resin film, any appropriate resin film that can be used as a polarizing element can be used. The resin film is typically a polyvinyl alcohol-based resin (hereinafter referred to as "PVA-based resin") film.

As the PVA-based resin forming the PVA-based resin film, any appropriate resin can be used. Examples include polyvinyl alcohol and ethylene-vinyl alcohol copolymer. Polyvinyl alcohol is obtained by saponifying polyvinyl acetate. The ethylene-vinyl alcohol copolymer is obtained by saponifying an ethylene-vinyl acetate copolymer. The saponification degree of the PVA-based resin is usually 85 mol% to 100 mol%, preferably 95.0 mol% to 99.95 mol%, and further preferably 99.0 mol% to 99.93 mol%. The degree of saponification can be determined in accordance with JIS K 6726-1994. By using such a PVA resin having a degree of saponification, a polarizing element having excellent durability can be obtained. When the degree of saponification is too high, gelation may occur.

The average degree of polymerization of the PVA-based resin is appropriately selected depending on the purpose. The average polymerization degree is usually 1000 to 10,000, preferably 1200 to 4500, and further preferably 1500 to 4,300. The average degree of polymerization can be determined in accordance with JIS K 6726-1994.

Examples of the dichroic substance contained in the resin film include iodine and organic dyes. These may be used alone or in combination of two or more. Preferably, iodine is used. This is because, for example, in the case where a non-polarized portion is formed by decoloring by chemical treatment, the iodine complex contained in the resin film (polarizing element) is appropriately reduced, and is therefore used in, for example, a camera portion In this case, a non-polarized portion having suitable characteristics can be formed.

The resin film may be a single-layer resin film or a laminate of two or more layers.

Specific examples of the polarizing element composed of a single-layer resin film include a film obtained by subjecting a PVA-based resin film to a dyeing treatment and stretching treatment (typically uniaxial stretching) using iodine. The dyeing using iodine is performed, for example, by immersing a PVA-based film in an iodine aqueous solution. The stretching ratio of the uniaxial stretching is preferably 3 to 7 times. Stretching may be performed after the dyeing treatment, or may be performed while dyeing. Alternatively, dyeing may be performed after stretching. If necessary, the PVA-based resin film is subjected to a swelling treatment, a crosslinking treatment, a washing treatment, a drying treatment, and the like. For example, by immersing a PVA-based resin film in water and washing it before dyeing, not only the dirt and anti-blocking agent on the surface of the PVA-based film can be washed, but also the PVA-based resin film can be swelled to prevent uneven dyeing.

Specific examples of the polarizing element obtained by using a laminated body include a laminated body using a resin substrate and a PVA-based resin layer (PVA-based resin film) laminated on the resin substrate, or a resin substrate and coating A polarizing element obtained by laminating a PVA-based resin layer on the resin substrate. A polarizing element obtained by using a laminate of a resin substrate and a PVA-based resin layer formed on the resin substrate can be produced, for example, by applying a PVA-based resin solution to the resin substrate to make it A PVA-based resin layer is formed on the resin substrate by drying to obtain a laminated body of the resin substrate and the PVA-based resin layer; the laminated body is extended and dyed to make the PVA-based resin layer into a polarizing element. In this embodiment, extending | stretching typically includes immersing a laminated body in the boric-acid aqueous solution, and extending. Furthermore, if necessary, the stretching in the boric acid aqueous solution may include stretching the laminate at a high temperature (for example, 95 ° C. or higher) in the air. The obtained resin substrate / polarizing element laminated body can be used directly (that is, the resin substrate can be used as a protective layer of the polarizing element), or the resin substrate can be peeled from the resin substrate / polarizing element laminated body, and Any appropriate protective layer is laminated on the peeling surface according to the purpose. The details of the method of manufacturing such a polarizer are described in, for example, Japanese Patent Laid-Open No. 2012-73580. The entire contents of this publication are incorporated herein by reference.

The thickness of the polarizing element is preferably 15 μm or less, more preferably 1 μm to 12 μm, still more preferably 3 μm to 10 μm, and even more preferably 3 μm to 8 μm. When the thickness of the polarizing element is within this range, curling during heating can be well suppressed, and good appearance durability during heating can be obtained. Furthermore, if the thickness of the polarizing element is within this range, it can contribute to the reduction in thickness of the polarizing plate (resulting in an image display device) with an anti-reflection layer.

The polarizing element preferably exhibits absorption dichroism at any one of the wavelengths of 380 nm to 780 nm. The individual body transmittance of the polarizing element is preferably 43.0% to 46.0%, and more preferably 44.5% to 46.0%. The degree of polarization of the polarizing element is preferably 97.0% or more, more preferably 99.0% or more, and even more preferably 99.9% or more.

B-2. Protective layer As the protective layer 12, any appropriate resin film is used. Examples of the material for forming the resin film include (meth) acrylic resins, cellulose resins such as diacetyl cellulose, triethyl cellulose, cycloolefin resins such as norbornene resins, and olefin resins such as polypropylene. Resins, ester resins such as polyethylene terephthalate resins, polyamide resins, polycarbonate resins, and copolymer resins thereof. The "(meth) acrylic resin" refers to an acrylic resin and / or a methacrylic resin.

In one embodiment, as the (meth) acrylic resin, a (meth) acrylic resin having a glutaridine imine structure is used. A (meth) acrylic resin (hereinafter, also referred to as a glutarimide resin) having a glutarimilide structure is described in, for example, Japanese Patent Laid-Open No. 2006-309033 and Japanese Patent Laid-Open No. 2006-317560. Japanese Patent Laid-Open No. 2006-328329, Japanese Patent Laid-Open No. 2006-328334, Japanese Patent Laid-Open No. 2006-337491, Japanese Patent Laid-Open No. 2006-337492, Japanese Patent Laid-Open No. 2006-337493 Japanese Patent Laid-Open No. 2006-337569, Japanese Patent Laid-Open No. 2007-009182, Japanese Patent Laid-Open No. 2009-161744, and Japanese Patent Laid-Open No. 2010-284840. These records are incorporated herein by reference.

The moisture permeability of the protective layer 12 is preferably 1.0 g / m ² / 24hr or less, more preferably 0.8 g / m ² / 24hr or less, still more preferably 0.6 g / m ² / 24hr or less, and even more preferably 0.4 g / m ² / 24hr or less. If the moisture permeability of the protective layer is within this range, it is possible to further suppress dimensional changes in a high-temperature and high-humidity environment, and as a result, it is possible to further suppress peeling and wrinkles of the anti-glare layer.

The thickness of the protective layer is typically 10 μm to 100 μm, and preferably 20 μm to 40 μm. The protective layer is typically laminated on the polarizing element via an adhesive layer (specifically, an adhesive layer and an adhesive layer). The adhesive layer is typically formed of a PVA-based adhesive and an activated energy ray-curable adhesive. The adhesive layer is typically formed of an acrylic adhesive.

C. Anti-glare layer The anti-glare layer is provided to prevent glare on the face of the user of the image display device, the keyboard of the image display device, external light (for example, fluorescent light), and the like. In the embodiment of the present invention, the anti-glare layer is an alignment cured layer of a liquid crystal compound. It is one of the features of the present invention to suppress the peeling and wrinkling of the anti-glare layer in a high temperature and high humidity environment.

The anti-glare layer is typically an alignment cured layer of a liquid crystal compound. The "alignment-cured layer" in this specification refers to a layer in which a liquid crystal compound is aligned in a specific direction in a layer, and the alignment state is fixed. The term "alignment-cured layer" refers to a concept including an alignment-hardened layer obtained by curing a liquid crystal monomer. The liquid crystal compound may be a rod-shaped liquid crystal compound, a dish-shaped (disk-shaped) liquid crystal compound, or a combination of these.

In one embodiment, the anti-glare layer includes a dish-type liquid crystal compound. More specifically, the anti-glare layer is a layer obtained by fixing a dish-type liquid crystal compound in a state of being aligned in a specific direction. The so-called dish-shaped liquid crystal compound generally refers to a linear alkyl group, an alkoxy group, a substituted benzamyloxy group, and the like. A liquid crystal compound having a disc-shaped molecular structure in which side chains are radially substituted. Typical examples of dish-type liquid crystals include C. Destrade's research report, Mol. Cryst. Liq. Cryst. Vol. 71, p. 111 (1981), benzene derivatives, terphenylene derivatives, Research reports on indene benzene derivatives, phthalocyanine derivatives, B. Kohne, etc., Angew. Chem. 96, page 70 (1984), cyclohexane derivatives, and research reports by JMLehn, etc. , J. Chem. Soc. Chem. Commun., Page 1794 (1985), research report by J. Zhang et al., J. Am. Chem. Soc. Volume 116, page 2655 (1994) Crown ring, phenylacetylene ring. Further specific examples of the dish-type liquid crystal compound include, for example, Japanese Patent Laid-Open No. 2006-133652, Japanese Patent Laid-Open No. 2007-108732, Japanese Patent Laid-Open No. 2010-244038, and Japanese Patent Laid-Open No. 2014- The compound described in Japanese Patent No. 214177. The descriptions of the above-mentioned documents and gazettes are incorporated herein by reference. The anti-glare layer containing a dish-type liquid crystal compound may be a so-called negative A plate having a refractive index characteristic of nx = nz> ny.

In another embodiment, the anti-glare layer includes a rod-like liquid crystal compound. In more detail, the anti-glare layer is aligned (homogeneous alignment) in a state where the rod-like liquid crystal compounds are aligned in a specific direction (typically, the direction of the slow axis). Examples of the rod-shaped liquid crystal compound include a liquid crystal compound whose liquid crystal phase is a nematic phase (nematic liquid crystal). As such a liquid crystal compound, for example, a liquid crystal polymer or a liquid crystal monomer can be used. The liquid crystal properties of a liquid crystal compound can be lyotropic or thermotropic. The liquid crystal polymer and the liquid crystal monomer may be used individually or in combination. As the liquid crystal monomer, any appropriate liquid crystal monomer can be used. For example, the polymerizable liquid crystal primitive compounds described in Japanese Patent Publication No. 2002-533742 (WO00 / 37585), EP358208 (US5211877), EP66137 (US4388453), WO93 / 22397, EP0261712, DE19504224, DE4408171, and GB2280445 can be used. . Specific examples of such a polymerizable liquid crystal priming compound include, for example, the trade name LC242 of BASF, the trade name E7 of Merck, and the trade name LC-Sillicon-CC3767 of Wacker-Chem. The liquid crystal monomer is preferably, for example, a nematic liquid crystal monomer. Specific examples of the liquid crystal compound are described in, for example, Japanese Patent Laid-Open No. 2006-163343. The contents of this publication are incorporated herein by reference. The anti-glare layer containing a rod-like liquid crystal compound may be a so-called positive A plate having a refractive index characteristic of nx> ny = nz.

The anti-glare layer typically functions as a λ / 2 plate. When the anti-glare layer functions as a λ / 2 plate, it is possible to prevent glare well by controlling its alignment angle (or the direction of the late axis). The in-plane retardation Re (550) of such an anti-glare layer is 220 nm to 320 nm, more preferably 240 nm to 300 nm, and even more preferably 250 nm to 280 nm. Here, Re (550) is an in-plane phase difference measured with light having a wavelength of 550 nm at 23 ° C. Re (550) is calculated from Re (550) = (nx-ny) × d when the thickness of the layer (film) is d (nm). nx is the refractive index in the direction where the refractive index in the plane becomes the largest (that is, the direction of the late phase axis), and ny is the refractive index in the plane that is orthogonal to the late phase axis (that is, the direction of the phase axis).

The angle formed by the late phase axis of the anti-glare layer 40 and the absorption axis of the polarizing element 11 is preferably 35 ° to 55 °, more preferably 40 ° to 50 °, and even more preferably about 45 °. By arranging the anti-glare layer functioning as a λ / 2 plate at such an axis angle, it is possible to prevent glare well.

The thickness of the anti-glare layer is preferably 1 μm to 5 μm, and more preferably 1 μm to 3 μm. According to the embodiment of the present invention, even with such a thin anti-glare layer, peeling and wrinkling in a high-temperature and high-humidity environment can be well suppressed.

When an alignment film is used for the alignment of a liquid crystal compound, a polarizing plate with an anti-reflection layer and an anti-glare layer is further provided with an alignment film between the anti-glare layer 40 and the base material 50 for the anti-glare layer. The alignment film generally includes a polymer material as a main component. Typical examples of the polymer material include polyvinyl alcohol, polyimide, and derivatives thereof. In the embodiment of the present invention, modified or unmodified polyvinyl alcohol is preferred. As the alignment film, for example, the modified polyvinyl alcohol described in WO01 / 88574A1, Japanese Patent No. 3907735 can be used. The alignment film is typically subjected to an alignment process. Typical examples of the alignment process include a rubbing process and a photo-alignment process. Since the rubbing treatment is well known in the industry, detailed description is omitted. As the alignment film (photo-alignment film) subjected to the photo-alignment treatment, for example, an alignment film described in WO2005 / 096041, a trade name LPP-JP265CP manufactured by Rolic echnologies, etc. can be used. The thickness of the alignment film is, for example, 0.01 μm to 10 μm, preferably 0.01 μm to 1 μm, and more preferably 0.01 μm to 0.5 μm.

The anti-glare layer can be formed by, for example, the following steps. First, a coating liquid for forming an alignment film is applied to a base material for an anti-glare layer, and dried to form a coating film. This coating film is subjected to a rubbing treatment in a specific direction to form an alignment film on a base material for an anti-glare layer. The specific direction may correspond to the retarded axis direction of the obtained anti-glare layer. Next, a coating liquid for forming an anti-glare layer (for example, a solution containing a liquid crystal compound and optionally a crosslinkable monomer) is applied to the formed alignment film, and then heated. By heating, the solvent of the coating liquid is removed, and the liquid crystal compound is aligned. The heating may be performed in one step, or may be performed in multiple steps by changing the temperature. Then, the crosslinkable (or polymerizable) monomer is crosslinked (or polymerized) by ultraviolet irradiation, and the alignment of the liquid crystal compound is fixed. In this way, an anti-glare layer is formed on the base material for an anti-glare layer (essentially on the alignment film). In addition, a method of aligning a dish-type liquid crystal compound is described in, for example, Japanese Patent Laid-Open No. 2014-214177, and a method of aligning a rod-shaped liquid crystal compound is described in, for example, Japanese Patent Laid-Open No. 2006-163343. The descriptions of these publications are incorporated herein by reference. In addition, the alignment film can be omitted depending on the required alignment state, the type of the liquid crystal compound, and the like.

D. Base material for anti-glare layer The base material 50 for anti-glare layer is used for forming the anti-glare layer 50.

As the base material for the anti-glare layer, any appropriate resin film is used. Examples of the material for forming the resin film include polyester resins such as polyethylene terephthalate (PET), cycloolefin-based resins such as norbornene-based resins, and cycloolefins (for example, norbornene) and α- Cellulose-based resins such as resins (COC) and triethyl cellulose (TAC) obtained by addition polymerization of olefins (for example, ethylene).

The thickness of the base material for the anti-glare layer is appropriately set depending on the purpose. The thickness of the base material for the anti-glare layer is typically 20 μm to 200 μm, and preferably 25 μm to 100 μm.

E. Base material for antireflection layer E-1. Base body for antireflection layer The base material 20 for antireflection layer is used to form the antireflection layer 30. As described below, by forming an anti-reflection layer on the base material for the anti-reflection layer, the laminated body of the base material for the anti-reflection layer / anti-reflection layer is bonded to the polarizing plate, and it becomes unnecessary to provide the polarizing plate for the anti-reflection A layer formation process (typically, sputtering). As a result, since the polarizing plate is not exposed to high temperatures, the moisture content of the polarizing plate can be maintained within the above-mentioned required range.

The material and thickness of the base material for the anti-reflection layer are the same as those of the base material for the anti-glare layer.

As described above, the moisture content of the base material 20 for the antireflection layer is 2.0% by weight or more, preferably 2.4% by weight or more, more preferably 2.7% by weight or more, still more preferably 3.0% by weight or more, and even more preferably 3.5% by weight. %the above. The upper limit of the moisture content is, for example, 5.0% by weight. By making the base material for the antireflection layer have such a high moisture content, it is possible to suppress the expansion and contraction of the base material for the antireflection layer in a high temperature and high humidity environment. Following this, the expansion and contraction of the base material for the anti-glare layer can also be suppressed. As a result, since the anti-glare layer (alignment-cured layer of the liquid crystal compound) can follow the expansion and contraction of the base material for the anti-glare layer even in a high-temperature and high-humidity environment, peeling and wrinkles of the anti-glare layer can be suppressed. Such a high moisture content of the base material for the antireflection layer can be achieved by supplying the base material for the antireflection layer to a humidification treatment. The humidification treatment can be performed by any appropriate method and conditions as long as the base material for the anti-reflection layer can provide the above-mentioned required moisture content. The humidification treatment can be performed, for example, by leaving the base material for the antireflection layer in an environment of 65 ° C. and 90% RH for 24 hours.

The dimensional change rate of the substrate for the antireflection layer after being held at 65 ° C and 90% RH for 24 hours is preferably less than 0.03%, and more preferably -0.03% to 0.0%. This dimensional change rate is typically a dimensional change rate in a direction orthogonal to the conveyance direction. When the dimensional change rate is positive, it indicates expansion, and when it is negative, it indicates contraction.

E-2. Hard coat layer As described above, a hard coat layer may be formed on the surface of the antireflection layer side of the base material for the antireflection layer. By forming a hard coat layer, there is an advantage that pencil hardness is improved. Furthermore, by appropriately adjusting the refractive index difference between the hard coat layer and the antireflection layer, the reflectance can be further reduced.

The hard coating layer preferably has sufficient surface hardness, excellent mechanical strength, and excellent light transmittance. The hard coat layer may be formed of any appropriate resin as long as it has such required characteristics. Specific examples of the resin include a thermosetting resin, a thermoplastic resin, an ultraviolet curing resin, an electron beam curing resin, and a two-liquid mixed resin. An ultraviolet curable resin is preferred. This is because a hard coat layer can be formed with simple operation and high efficiency.

Specific examples of the ultraviolet-curable resin include polyester-based, acrylic-based, urethane-based, ammonium-based, silicone-based, and epoxy-based ultraviolet-curable resins. The ultraviolet-curable resin may include a monomer, oligomer, and polymer of an ultraviolet-curable type. As a preferable ultraviolet curable resin, the resin composition containing the acrylic monomer component or oligomer component which has 2 or more, and more preferably, 3 to 6 ultraviolet polymerizable functional groups is mentioned. Typically, a photopolymerization initiator is blended in the ultraviolet curable resin.

The hard coat layer can be formed by any appropriate method. For example, the hard coat layer can be formed by applying a resin composition for forming a hard coat layer on a base material for an antireflection layer and drying it, and irradiating the dried coating film with ultraviolet rays to harden it.

The thickness of the hard coat layer is, for example, 0.5 μm to 20 μm, and preferably 1 μm to 15 μm.

Details of the hard coat layer and the adhesion structure between the hard coat layer and the antireflection layer are described in, for example, Japanese Patent Laid-Open No. 2016-224443. The contents of this publication are incorporated herein by reference.

F. Anti-reflection layer As the constitution of the anti-reflection layer, any appropriate constitution can be adopted. As a representative structure of the antireflection layer, (1) a single layer of a low refractive index layer having an optical film thickness of 120 nm to 140 nm and a refractive index of about 1.35 to 1.55; (2) a base for the self-reflection layer A laminated body having a middle refractive index layer, a high refractive index layer, and a low refractive index layer in order from the material side; (3) an alternating multilayer laminated body of a high refractive index layer and a low refractive index layer.

Examples of a material capable of forming a low refractive index layer include silicon oxide (SiO ₂ ) and magnesium fluoride (MgF ₂ ). The refractive index of the low refractive index layer is typically about 1.35 to 1.55. Examples of the material capable of forming a high refractive index layer include titanium oxide (TiO ₂ ), niobium oxide (Nb ₂ O ₃ or Nb ₂ O ₅ ), tin-doped indium oxide (ITO), antimony-doped tin oxide (ATO), ZrO ₂ -TiO ₂ . The refractive index of the high refractive index layer is typically about 1.60 to 2.20. Examples of the material capable of forming the middle refractive index layer include titanium oxide (TiO ₂ ), a mixture of a material capable of forming a low refractive index layer and a material capable of forming a high refractive index layer (for example, a mixture of titanium oxide and silicon oxide). The refractive index of the middle refractive index layer is typically about 1.50 to 1.85. The thicknesses of the low-refractive index layer, the middle-refractive index layer, and the high-refractive index layer can be set in such a manner that the layer structure of the anti-reflection layer and the appropriate optical film thickness corresponding to the required anti-reflection performance are set.

The antireflection layer is typically formed by a dry process. Specific examples of the dry process include a PVD (Physical Vapor Deposition) method and a CVD (Chemical Vapor Deposition) method. Examples of the PVD method include a vacuum vapor deposition method, a reactive vapor deposition method, an ion beam assisted method, a sputtering method, and an ion plating method. Examples of the CVD method include a plasma CVD method. A sputtering method is preferable.

The thickness of the anti-reflection layer is, for example, about 20 nm to 300 nm.

The difference between the maximum reflectance and the minimum reflectance of the anti-reflection layer in the wavelength range of 400 nm to 700 nm is preferably 2.0% or less, more preferably 1.9% or less, and still more preferably 1.8% or less. If the difference between the maximum reflectance and the minimum reflectance is within this range, the coloring of the reflected light can be prevented well.

If necessary, an antifouling layer can be provided on the surface of the anti-reflection layer. The antifouling layer contains, for example, a fluorine-containing silane-based compound (for example, an alkoxysilane compound having a perfluoropolyether group) or a fluorine-containing organic compound. The antifouling layer preferably exhibits water resistance with a water contact angle of 110 degrees or more.

G. First retardation layer The first retardation layer may be formed of a retardation film having any suitable optical characteristics and / or mechanical characteristics. In one embodiment, the first retardation layer can function as a λ / 2 plate. By making the first retardation layer function as a λ / 2 plate, the wavelength dispersion characteristics (especially the wavelengths whose retardation deviates from λ / 4) of the second retardation layer functioning as a λ / 4 plate are laminated. Range), the phase difference can be adjusted appropriately. The in-plane retardation Re (550) of such a first retardation layer is preferably 220 nm to 320 nm, more preferably 240 nm to 300 nm, and even more preferably 250 nm to 280 nm.

The thickness of the first retardation layer can be set as a mode in which the λ / 2 plate functions optimally. In other words, the thickness is set in such a way that the required in-plane phase difference can be obtained. Specifically, the thickness is preferably 10 μm to 60 μm, and more preferably 30 μm to 50 μm.

The first retardation layer preferably has a refractive index characteristic showing a relationship of nx> ny> nz. The Nz coefficient of the first retardation layer is preferably 1.1 to 3.0, and more preferably 1.3 to 2.7. The Nz coefficient is obtained by Nz = Rth / Re. Rth is the phase difference in the thickness direction. For example, Rth (550) is the phase difference in the thickness direction measured by light with a wavelength of 550 nm at 23 ° C. Rth (550) is obtained by Rth = (nx-nz) × d. nz is the refractive index in the thickness direction.

The first retardation layer may be arranged such that the retardation axis and the absorption axis of the polarizing element form an angle of preferably 10 ° to 20 °, more preferably 12 ° to 18 °, and even more preferably about 15 °. In addition, when referring to angle in this specification, it includes both clockwise and counterclockwise.

The absolute value of the first retardation layer including the photoelastic coefficient is preferably 2 × 10 ^-11 m ² / N or less, more preferably 2.0 × 10 ^-13 m ² / N to 1.5 × 10 ^-11 m ² / N, and further preferably ^{1.0 × 10 -12 m 2 /N~1.2×10 -11} m 2 / N of the resin. If the absolute value of the photoelastic coefficient is in this range, it is difficult to cause a change in phase difference when a shrinkage stress during heating is generated. Therefore, by using a resin having such an absolute value of the photoelastic coefficient to form the first retardation layer, the polarizing plate with an anti-reflection layer and an anti-glare layer can be used well in an image display device. Prevent heat unevenness.

The first retardation layer can display inverse dispersion wavelength characteristics in which the retardation value becomes larger according to the wavelength of the measurement light, and can also display positive wavelength dispersion characteristics in which the retardation value becomes smaller according to the wavelength of the measurement light, and can also display The retardation value is based on a flat wavelength dispersion characteristic that hardly changes the wavelength of the measurement light. It is preferable to exhibit flat wavelength dispersion characteristics. Specifically, the Re (450) / Re (550) of the first retardation layer is preferably 0.99 to 1.03, and the Re (650) / Re (550) is preferably 0.98 to 1.02. By arranging the λ / 2 plate (the first retardation layer) and the λ / 4 plate (the second retardation layer) having a flat wavelength dispersion characteristic at a specific axis angle, it is possible to obtain the inverse wavelength dispersion characteristic from the ideal As a result, it is possible to achieve very excellent anti-reflection characteristics.

The first retardation layer may be made of any suitable resin film that can satisfy any of the characteristics described above. Representative examples of such resins include cyclic olefin resins, polycarbonate resins, cellulose resins, polyester resins, polyvinyl alcohol resins, polyamide resins, and polyimide resins. , Polyether resin, polystyrene resin, acrylic resin. Among them, a cyclic olefin-based resin can be suitably used. The first retardation layer is obtained, for example, by stretching a film made of the resin. Details of the cyclic olefin-based resin and the extension method of the resin film (the formation method of the retardation film) are described in, for example, Japanese Patent Laid-Open No. 2015-210459 and Japanese Patent Laid-Open No. 2016-105166. The contents of this publication are incorporated herein by reference.

H. Second retardation layer The second retardation layer may be formed of a retardation film having arbitrary suitable optical characteristics and / or mechanical characteristics. When the first retardation layer functions as a λ / 2 plate, the second retardation layer typically functions as a λ / 4 plate. By correcting the wavelength dispersion characteristics of the second retardation layer that functions as a λ / 4 plate by using the optical characteristics of the first retardation layer that functions as the λ / 2 plate, it is possible to exhibit a wide wavelength range. Circular polarizing function. The in-plane retardation Re (550) of such a second retardation layer is preferably 100 nm to 180 nm, more preferably 110 nm to 170 nm, and even more preferably 120 nm to 160 nm.

The thickness of the second retardation layer can be set as a method in which the λ / 4 plate can function optimally. In other words, the thickness can be set in such a manner that the required in-plane phase difference can be obtained. Specifically, the thickness is preferably 10 μm to 50 μm, and most preferably 20 μm to 40 μm.

The second retardation layer preferably has a refractive index characteristic showing a relationship of nz> nx> ny. The Nz coefficient of the second retardation layer is preferably -10 to -0.1, and more preferably -5 to -1.

The second retardation layer may be disposed such that the retardation axis and the absorption axis of the polarizing element form an angle of preferably 70 ° to 80 °, more preferably 72 ° to 78 °, and even more preferably about 75 °.

The second retardation layer may be formed of any appropriate resin film that can satisfy the above-mentioned characteristics. Such a resin may typically be a polymer having a negative intrinsic birefringence. A polymer having a negative intrinsic birefringence refers to a polymer whose refractive index in the alignment direction becomes relatively small when the polymer is aligned by extension or the like. As a polymer having a negative intrinsic birefringence, for example, a polymer having a polar anisotropy such as an aromatic group or a carbonyl group or a functional group is introduced into a side chain of the polymer. Specific examples include modified polyolefin-based resins (for example, modified polyethylene-based resins), acrylic resins, styrene-based resins, maleimide-based resins, and fumarate-based resins. . The second retardation layer can be obtained, for example, by appropriately stretching a film made of the resin.

I. Manufacturing method of polarizing plate with anti-reflection layer and anti-glare layer One embodiment of the present invention is a method for manufacturing a polarizing plate with anti-reflection layer and anti-glare layer, which includes the following steps: producing polarized light including a polarizing element and a protective layer Element laminate; forming an anti-reflection laminate on an anti-reflection layer substrate; forming an anti-reflection laminate on an anti-glare substrate; forming an anti-glare laminate; and forming the polarizing element laminate, The anti-glare laminated body and the anti-reflection laminated body are bonded together.

The polarizing element laminated body can be produced by any appropriate method. When a polarizing element composed of a single-layer resin film is used, the polarizing element and the resin film constituting the protective layer may be bonded together via any appropriate adhesive layer (adhesive layer or adhesive layer). When a laminated body of a resin substrate and a PVA-based resin layer (PVA-based resin film) laminated on the resin substrate is used, the laminated body may be subjected to dyeing and stretching treatment to form a PVA-based resin. As a polarizing element, this laminated body was used as a polarizing element laminated body directly. Alternatively, a resin film constituting a protective layer may be bonded to the surface of the polarizing element of the laminated body and used. In this case, the resin substrate may or may not be peeled. When a polarizing element obtained by using a laminate of a resin substrate and a PVA-based resin layer formed on the resin substrate is used, the operation may be performed as described in the above item B-1 (for example, The operation is performed as described in Japanese Patent Application Laid-Open No. 2012-73580) to produce a resin substrate / polarizing element laminated body, and the laminated body is directly used as a polarizing element laminated body. Alternatively, a resin film constituting a protective layer may be bonded to the surface of the polarizing element of the laminated body and used. In this case, the resin substrate may or may not be peeled.

The antireflection laminated system is produced by forming an antireflection layer on a substrate for an antireflection layer. When the anti-reflection layer is formed, a surface treatment may be performed on the base material for the anti-reflection layer in advance if necessary. Examples of the surface treatment include a low-pressure plasma treatment, an ultraviolet irradiation treatment, a corona treatment, a flame treatment, and an acid or alkali treatment. Alternatively, an adhesion layer made of, for example, SiO _{x may be} formed on the surface of the base material for the antireflection layer. As described above, the anti-reflection layer is typically formed by a dry process (for example, sputtering). For example, when the antireflection layer is an alternate multilayer laminate of a high refractive index layer and a low refractive index layer, a Nb ₂ O ₅ film (high refractive index layer) is sequentially formed on the surface of the base material for the antireflection layer by sputtering, for example. , SiO ₂ film (low refractive index layer), Nb ₂ O ₅ film (high refractive index layer), and SiO ₂ film (low refractive index layer), thereby forming an antireflection layer.

The anti-glare laminated system is produced by forming an anti-glare layer on a substrate for an anti-glare layer. The formation order of the anti-glare layer is as described in the above item C.

Finally, a polarizing plate with an anti-reflection layer and an anti-glare layer can be obtained by bonding the polarizing element laminate, the anti-glare laminate, and the anti-reflection laminate. The anti-reflection laminated body can be laminated on the anti-glare laminated body / polarizing element laminated body, and the anti-reflection laminated body / anti-glare laminated body can also be attached on the polarizing element laminated body. The polarizing plate with the anti-reflection layer and the anti-glare layer can be bonded to the polarizing element laminated body by, for example, any appropriate adhesive layer (for example, an adhesive layer, an adhesive layer). The surface of the protective layer is obtained by bonding the base material for the anti-reflection layer of the anti-reflection laminate to the surface of the base material for the anti-glare layer through any appropriate adhesive layer. In the embodiment of the present invention, as described above, the moisture content of the base material for the antireflection layer at the time of bonding is 2.0% by weight or more. Such a moisture content can be achieved by subjecting the base material for an antireflection layer to a humidification treatment in advance.

J. Image display device The polarizing plate with an anti-reflection layer and an anti-glare layer according to the embodiment of the present invention can be applied to an image display device. Typically, a polarizing plate with an anti-reflection layer and an anti-glare layer can be arranged on the visual side of the image display device in such a manner that the anti-reflective layer becomes the visual side. Typical examples of the image display device include a liquid crystal display device, an organic electroluminescence (EL) display device, and a quantum dot display device. [Example]

Hereinafter, the present invention will be specifically described by examples, but the present invention is not limited by these examples. In addition, the measurement method of each characteristic is as follows.

(1) Moisture content of the base material for the anti-reflection layer The base material for the anti-reflection layer used in the examples and comparative examples was cut into a size of 200 mm × 300 mm so that the conveying direction became short sides, and used as a measurement sample. Measure the initial weight of the measurement sample. Then, this measurement sample was dried at 120 ° C for 24 hours, the dry weight was measured, and the moisture content was determined by the following formula. Moisture content (% by weight) = [(initial weight-dry weight) / initial weight] × 100 (2) Peeling and wrinkling The polarizing plate with the anti-reflection layer and the anti-glare layer obtained in the examples and comparative examples was used Cut out 200 mm × 300 mm so that the direction of the absorption axis of the polarizing element becomes the short side, and attach it to a glass plate as a measurement sample. This measurement sample was subjected to a severe humidification durability test under the following two conditions. In the test, ten measurement samples were used, and the peeling and wrinkling of the four corners of the polarizing plate with the anti-reflection layer and the anti-glare layer in each measurement sample were observed, and the occurrence rate and average length were calculated. Regarding the occurrence rate, the occurrence rate was determined by visually observing the presence or absence of peeling and wrinkles from the number of occurrence sites in 40 places (10 measurement samples × 4 corners). About the average length, the length was measured with a ruler, and the average value was calculated. <Test condition 1> The measurement sample was left in an oven at 85 ° C. and 85% RH for 100 hours. <Test condition 2> Glycerin was coated on the periphery of the polarizing plate with the anti-reflection layer and the anti-glare layer in the measurement sample, and the coated sample was placed in an oven at 65 ° C and 90% RH for 24 hours. hour.

[Example 1] 1. Production of a polarizing plate (layered body of polarizing element) As a resin substrate, a long-shaped amorphous phthalic acid copolymerized polymer having a water absorption of 0.75% and a Tg of 75 ° C was used. Ethylene phthalate (IPA copolymerized PET) film (thickness: 100 μm). Corona treatment was performed on one side of the substrate, and on the corona treated surface, a polyvinyl alcohol (polymerization degree of 4200, saponification degree of 99.2 mol%) was coated at a ratio of 9: 1 at 25 ° C and Acetylacetamyl-modified PVA (Polymerization degree of 1200, Ethylacetamyl modification degree of 4.6%, Saponification degree of 99.0 mol% or more, manufactured by Nippon Synthetic Chemical Industry Co., Ltd., trade name "GOHSEFIMER Z200") The aqueous solution was dried to form a PVA-based resin layer having a thickness of 11 μm, and a laminate was produced. The obtained laminated body was subjected to free-end uniaxial extension (air-assisted extension) to 2.0 times in the longitudinal direction (length direction) between rollers having different peripheral speeds in an oven at 120 ° C. Next, the laminate was immersed in an insolubilization bath (aqueous boric acid solution obtained by mixing 4 parts by weight of boric acid with 100 parts by weight of water) at a liquid temperature of 30 ° C (insolubilization treatment). Then, in a dyeing bath having a liquid temperature of 30 ° C., immersion was performed while adjusting the iodine concentration and immersion time so that the polarizing plate had a specific transmittance. In this example, the aqueous iodine solution obtained by mixing 0.2 parts by weight of iodine and 1.5 parts by weight of potassium iodide with respect to 100 parts by weight of water was immersed for 60 seconds (dyeing treatment). Then, immerse for 30 seconds in a crosslinking bath (aqueous boric acid solution prepared by mixing 3 parts by weight of potassium iodide with 100 parts by weight of water and 3 parts by weight of boric acid) at a liquid temperature of 30 ° C (crosslinking treatment). Thereafter, the laminated body was immersed in a boric acid aqueous solution having a liquid temperature of 70 ° C. (aqueous solution obtained by mixing 4 parts by weight of boric acid with respect to 100 parts by weight of water and 5 parts by weight of potassium iodide) while varying the peripheral speed. The rolls are uniaxially stretched (stretched in water) so that the total stretch ratio becomes 5.5 times in the longitudinal direction (lengthwise direction). Thereafter, the laminated body was immersed in a washing bath (aqueous solution obtained by mixing 4 parts by weight of potassium iodide with 100 parts by weight of water) at a liquid temperature of 30 ° C (washing treatment). Next, apply a PVA-based resin aqueous solution (manufactured by Nippon Synthetic Chemical Industry Co., Ltd. under the trade name "GOHSEFIMER (registered trademark) Z-200", resin concentration: 3% by weight) on the surface of the PVA-based resin layer (polarizing element) of the laminate, A methacrylic resin film (thickness: 25 μm, having a glutaridine imine structure) constituting a protective layer was attached, and it was heated in an oven maintained at 60 ° C. for 5 minutes. After that, the resin substrate was peeled from the PVA-based resin layer. Next, the PVA-based resin layer surface (resin substrate peeling surface) of the laminated body was coated with an aqueous PVA-based resin solution (manufactured by Nippon Synthetic Chemical Industry Co., Ltd., trade name "GOHSEFIMER (registered trademark) Z-200", resin concentration: 3 weight %), And a methacrylic resin film (thickness: 40 μm, having a glutaridine imine structure) constituting a protective layer was pasted, and it was heated in an oven maintained at 60 ° C. for 5 minutes. In this way, a polarizing element laminate (a polarizing plate having a protective layer / polarizing element / protective layer structure) was obtained. Furthermore, the thickness of the polarizing element was 5 μm, and the individual transmittance was 42.3%.

2. Production of anti-reflection laminated body A hard-coated (HC) layer (thickness: 7 μm) was formed by hard coating on one side of a TAC film (product name: KC2UA, thickness: 25 μm) manufactured by Konica Minolta Company. To obtain an HC-TAC film (thickness: 32 μm). This HC-TAC film was used as a base material for an antireflection layer. On the surface of the HC layer of the base material for the anti-reflection layer, an adhesion layer (thickness: 10 nm) made of SiO _{x was} formed by sputtering, and an Nb ₂ O ₅ film (high refraction) was sequentially formed on the adhesion layer. Rate layer), SiO ₂ film (low refractive index layer), Nb ₂ O ₅ film (high refractive index layer), and SiO ₂ film (low refractive index layer) to form an antireflection layer (thickness or optical film thickness: 200) nm). Further, an antifouling layer (thickness: 10 nm) made of an alkoxysilane compound having a perfluoropolyether group was formed on the antireflection layer to prepare an antireflection laminate. This anti-reflection laminated body was subjected to a humidification treatment (placed in an oven at 65 ° C. and 90% RH for 24 hours). The moisture content of the obtained antireflection laminated body (substantially the base material for an antireflection layer) was 3.8% by weight.

3. The single-sided surface of the anti-glare laminated body is a TAC film (product name: KC4UY, thickness: 40 μm) manufactured by Konica Minolta Company as a base material for the anti-glare layer. In the method described in Example 1>, an alignment film and an alignment cured layer (anti-glare layer) of a liquid crystal compound were formed, and an anti-glare laminated body was produced. In addition, the in-plane retardation Re (550) of the anti-glare layer is 270 nm, and is formed so that its late phase axis forms an angle of 45 ° with respect to the absorption axis of the polarizing element.

4. The polarizing plate with anti-reflection layer and anti-glare layer is made on the 40 μm protective layer of the polarizer layered body (polarizing plate), and the anti-glare layered body is bonded with an acrylic adhesive (thickness: 20 μm). The glare layer is laminated on the surface of the obtained base material for the anti-glare layer with an HC-TAC film of an anti-reflection laminate through an acrylic adhesive (thickness: 20 μm) to obtain an anti-reflection layer and an anti-glare layer. Polarizer for glare layer. The obtained polarizing plate with an anti-reflection layer was used for the evaluation of (2) above. The results are shown in Table 1.

[Example 2] The condition for humidifying the antireflection laminate was changed to "40 ° C, 92% RH, and 24 hours", and the moisture content of the substrate for the antireflection layer at the time of bonding was set to 3.1% by weight. Other than that, a polarizing plate with an anti-reflection layer and an anti-glare layer was produced in the same manner as in Example 1. The obtained polarizing plate was subjected to the same evaluation as in Example 1. The results are shown in Table 1.

[Comparative Example 1] An anti-reflection laminated body was not subjected to a humidification treatment, and the moisture content of the base material for the anti-reflection layer at the time of bonding was set to 1.6% by weight. Polarizing plate with reflective layer and anti-glare layer. The obtained polarizing plate was subjected to the same evaluation as in Example 1. The results are shown in Table 1.

[Comparative Example 2] An anti-reflection laminate was vacuum-dried for 72 hours, and the moisture content of the base material for the anti-reflection layer at the time of bonding was set to 0.4% by weight. Polarizing plate with reflective layer and anti-glare layer. The obtained polarizing plate was subjected to the same evaluation as in Example 1. The results are shown in Table 1.

[Table 1]

It is clear from Table 1 that the incidence rate and average length of peeling and wrinkles of the anti-glare layer of the polarizing plate with an anti-reflection layer and an anti-glare layer in the examples of the present invention under a high-temperature and high-humidity environment are significant compared with the comparative examples. Ground to get suppressed. It was found that such excellent characteristics were achieved by adjusting the moisture content of the base material for the antireflection layer. [Industrial availability]

The polarizing plate with an anti-reflection layer and an anti-glare layer of the present invention can be suitably used in an image display device such as a liquid crystal display device, an organic EL display device, and a quantum dot display device.

10‧‧‧ polarizing plate

11‧‧‧ polarizing element

12‧‧‧ protective layer

20‧‧‧ Substrate for anti-reflection layer

30‧‧‧Anti-reflective layer

40‧‧‧Anti-glare layer

50‧‧‧Base material for anti-glare layer

100‧‧‧ polarizing plate with anti-reflection layer and anti-glare layer

FIG. 1 is a schematic cross-sectional view of a polarizing plate with an anti-reflection layer and an anti-glare layer according to an embodiment of the present invention.

Claims (6)

A polarizing plate with an anti-reflection layer and an anti-glare layer includes a polarizing plate having a polarizing element and a protective layer provided on one side of the polarizing element, and an alignment curing layer of a liquid crystal compound adhered to the protective layer. Anti-glare layer, base material for anti-glare layer, base material for anti-reflection layer bonded to base material for anti-glare layer, and anti-reflection layer formed directly on base material for anti-reflective layer, the anti-reflection The moisture content of the substrate for the layer is 2.0% by weight or more. For example, the polarizing plate with an anti-reflection layer and an anti-glare layer in claim 1, wherein the dimensional change rate of the above-mentioned substrate for the anti-reflection layer after being kept at 65 ° C and 90% RH for 24 hours does not reach 0.03%. For example, the polarizing plate with an anti-reflection layer and an anti-glare layer in claim 1, wherein the in-plane retardation Re (550) of the anti-glare layer is 220 nm to 320 nm. For example, the polarizing plate with an anti-reflection layer and an anti-glare layer according to claim 1, further comprising an alignment film between the anti-glare layer and the base material for the anti-glare layer, the alignment film including a polyvinyl alcohol resin. A method for manufacturing a polarizing plate with an anti-reflection layer and an anti-glare layer according to claim 1, comprising the following steps: making a polarizing element laminate including a polarizing element and a protective layer; forming an anti-reflection on a substrate for an anti-reflection layer Forming an anti-reflection laminate on the substrate for the anti-glare layer; forming an anti-glare laminate on the substrate for the anti-glare layer; and bonding the polarizing element laminate, the anti-glare laminate and the anti-reflection laminate; The moisture content of the base material for the antireflection layer is 2.0% by weight or more. The manufacturing method according to claim 5, wherein the substrate for the antireflection layer is subjected to a humidification treatment.