KR20210129030A - Polarizing film, optical laminate, and image display device - Google Patents

Abstract

A polarizing film is equipped with a polarizer, the 1st decorating layer and 1st adhesion layer by the side of one main surface of a polarizer, and the 2nd decorating layer and 2nd adhesion layer by the side of the other main surface, or a protective film. The first decorative layer is directly adhered to the periphery of one main surface without an adhesive layer interposed therebetween, the first adhesive layer is the surface opposite to the polarizer of the first decorative layer and the first decorative layer on one main surface is adhered, cover the non-existent area. The second decorative layer is directly adhered to the peripheral portion of the other main surface without an adhesive layer interposed therebetween. Cover the non-bonded area. The protective film is directly adhered to the other main surface without interposing an adhesive layer, or is adhered through an adhesive layer. Each of the first decorative layer, the second decorative layer, and the protective film has a water vapor transmission rate of 1500 g/m ² ·24 h or less when the thickness is 25 μm.

Description

Polarizing film, optical laminate, and image display device

The present invention relates to a polarizing film, an optical laminate, and an image display device.

DESCRIPTION OF RELATED ART The image display apparatus which displays images, such as a still image or a moving picture, is equipped with the panel member which includes, for example, a window member, an optical film, and a display panel. The image display device may also include a touch sensor. Moreover, the optical laminated body of the state which hold|maintained the laminated structure except the panel member of an image display apparatus by a separator may be provided for assembly of an image display apparatus. For example, when the separator of an optical laminated body is peeled and bonded with a panel member, an image display apparatus can be formed.

The optical film used in an image display apparatus is equipped with the polarizing film normally. A general polarizing film is provided with the protective film arrange|positioned so that each of the main surfaces of both a polarizer may be sandwiched between a film-form polarizer and a polarizer. An adhesive layer may interpose between a polarizer and each protective film.

In addition, in the image display apparatus, the request|requirement of thickness reduction and cost reduction is increasing gradually.

Patent Document 1 discloses a polarization base layer; a polarizing coating layer coated on a lower surface of the polarizing base layer; an adhesive layer disposed on the polarizing base layer; and a light blocking member printed on a surface of the polarizing base layer or the polarizing coating layer to form a single film. In Patent Document 1, it is described that the thickness of the display panel is reduced by replacing the polarizing plate disposed on the top of the display panel with a polarizing coating layer disposed under the cover glass, thereby reducing the manufacturing cost.

Korean Patent Application Laid-Open No. 10-2019-0020925 (Claim 1, [0006])

In a general polarizing film, a protective film is arrange|positioned on both main surfaces of a polarizer. It is advantageous when a polarizing film is formed without using at least one of such a protective film from a viewpoint of thickness reduction and low cost. By the way, in the polarizing film by which the at least one main surface side of a polarizer is not protected with a protective film, when exposed to a high-temperature, high-humidity environment, it became clear that the subject that discoloration becomes remarkable at the edge part of a polarizer may arise.

In addition, in this specification, the polarizing film which does not have a protective film on the side of at least one main surface among both main surfaces of a polarizer may be called a protection-less polarizing film.

A first aspect of the present invention, a polarizer,

A first decorative layer and a first adhesive layer adhered to one main surface of the polarizer;

A second decorative layer and a second adhesive layer, or a protective film adhered to the main surface of the other side of the polarizer,

The first decorative layer is directly adhered to the periphery of the one main surface without interposing an adhesive layer,

The first adhesive layer is formed so as to cover a surface of the first decorative layer opposite to the polarizer and a region on the one main surface of the first decorative layer to which the first decorative layer is not adhered,

The second decorative layer is directly adhered to the periphery of the other main surface without interposing an adhesive layer,

The second adhesive layer is formed so as to cover a surface of the second decorative layer opposite to the polarizer and an area on the other main surface of the second decorative layer to which the second decorative layer is not adhered,

The protective film is directly adhered to the main surface of the other side without interposing an adhesive layer, or is adhered through an adhesive layer,

Each of the said 1st decorating layer, the said 2nd decorating layer, and the said protective film relates to the polarizing film whose water ^{vapor transmission rate when thickness is 25 micrometers is 1500 g/m<2>*24h or less.}

A second aspect of the present invention includes at least one of the polarizing film, a window member, and a retardation film,

The polarizing film has a first main surface on the side of the viewer and a second main surface opposite to the first main surface,

The window member is disposed on the first main surface side of the polarizing film,

The retardation film relates to an optical laminate disposed on the second main surface side of the polarizing film.

A third aspect of the present invention is provided with the polarizing film and a panel member,

The polarizing film has a first main surface on the side of the viewer and a second main surface opposite to the first main surface,

The said panel member relates to the image display apparatus arrange|positioned on the said 2nd main surface side.

A fourth aspect of the present invention relates to an image display device comprising the optical laminate and a panel member disposed on a side opposite to the visual recognition side of the optical laminate.

It is possible to reduce discoloration of the polarizer when the non-protective polarizing film is exposed to a high-temperature, high-humidity environment.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic sectional drawing of the image display apparatus provided with the polarizing film of one Embodiment of this invention.
It is a schematic sectional drawing of the image display apparatus provided with the polarizing film of another embodiment of this invention.
It is a schematic sectional drawing of the laminated body (sample for evaluation) containing the polarizing film produced in Example 1. FIG.
4 is a Raman spectrum at four measurement points of the polarizer after putting the evaluation sample of Example 1 to fade for a long time in a high-temperature, high-humidity environment.
5 is a Raman spectrum at four measurement points of the polarizer after exposing the evaluation sample of Comparative Example 1 to a high-temperature, high-humidity environment for a long time.

The non-protective polarizing film is excellent in terms of thickness reduction and cost reduction. However, when the non-protective polarizing film is exposed to a high-temperature, high-humidity environment, it has been found that there are cases in which a new subject in which discoloration becomes remarkable in the polarizer (especially at the end of the polarizer) arises. Such discoloration of the polarizer is caused by the penetration of moisture through the interface between the polarizer and the layer adjacent to the polarizer under a high-temperature and high-humidity environment, or the moisture absorbed by the layer adjacent to the polarizer from entering the polarizer in the thickness direction from this layer. It is thought to be caused by

In a general polarizing film, since both main surfaces of a polarizer are covered with the protective film, the amount of water|moisture content which penetrates into a polarizer through a protective film is relatively small. In addition, the protective film is directly adhere|attached to the main surface of a polarizer, or is adhere|attaching through an adhesive layer. The adhesive layer is a layer of the cured product of the adhesive. Therefore, when the adhesiveness in the interface of a polarizer and a protective film or an adhesive layer is high, penetration of the water|moisture content from this interface is suppressed. Moreover, penetration of moisture through the adhesive layer which is a hardened|cured material is also suppressed. Therefore, in the general polarizing film in which both main surfaces of a polarizer are covered with the protective film, the discoloration in the edge part of a polarizer hardly becomes a problem.

On the other hand, in a polarizing film, an adhesion layer may be arrange|positioned adjacent to a polarizer. The adhesive layer is a layer composed of a non-curable adhesive and has fluidity. Since the hardening process is unnecessary for formation of an adhesive layer, there exists an advantage that lamination|stacking with another member is easy and rework is possible. Moreover, in the polarizing film used for a flexible image display apparatus, if an adhesion layer is provided, the stress at the time of bending a flexible image display apparatus repeatedly with an adhesion layer can be relieve|moderated. In such an adhesive layer, the constituent material itself often has a functional group involved in adhesiveness, and since it has a higher hydrophilicity than the cured product constituting the adhesive layer, moisture easily penetrates into the layer compared to the adhesive layer. In addition to the hydrophilicity of the material itself, due to the fluidity of the adhesive layer, moisture easily penetrates through the interface between the polarizer and the adhesive layer. Therefore, it became clear that the subject of the discoloration at the edge part of a polarizer at the time of exposing especially to a high-temperature, high-humidity environment becomes remarkable in the non-protection polarizing film provided with an adhesion layer. Moreover, in recent years, the display range of an image is in the direction of a widening (for example, full-screen display), and it is easy to become a problem also with slight discoloration of the edge part of a polarizer.

In view of the above, the polarizing film of the first aspect of the present invention includes a polarizer, a first decorative layer and a first adhesive layer adhered to one main surface of the polarizer, and a second decorative layer adhered to the other main surface of the polarizer. and a second adhesive layer or a protective film. The first decorative layer is directly adhered to the peripheral portion of one main surface of the polarizer without an adhesive layer interposed therebetween. The first adhesive layer is formed so as to cover a surface of the first decorative layer on the opposite side to the polarizer and a region on one main surface of the polarizer to which the first decorative layer is not adhered. The second decorative layer is directly adhered to the peripheral portion of the main surface of the other side of the polarizer without interposing an adhesive layer. The second adhesive layer is formed so as to cover a surface of the second decorative layer opposite to the polarizer and a region on the other main surface of the second decorative layer to which the second decorative layer is not adhered. The protective film is adhered directly to the main surface of the other side of the polarizer without interposing an adhesive layer, or is adhered via an adhesive layer. Each of the first decorative layer, the second decorative layer, and the protective film has a water vapor transmission rate of 1500 g/m ² ·24 h or less when the thickness is 25 μm.

With such a configuration, although the polarizing film of the present invention is a non-protective polarizing film, it is possible to reduce discoloration of the polarizer when the polarizing film is exposed to a high-temperature, high-humidity environment. This is thought to be due to the following reasons.

First, since the decorative layer is disposed in a state in which it is directly adhered to the peripheral portion of the main surface of the polarizer, it is suppressed from entering the inside of the decorative layer through the interface between the decorative layer and the polarizer under a high temperature and high humidity environment. In addition, since the moisture permeability of the decorative layer disposed on the peripheral portion of the main surface of the polarizer is low, the penetration of moisture into the interior of the decorative layer from the cross section of the decorative layer is reduced. Therefore, although the adhesive layer which tends to become high in water vapor transmission rate is arrange|positioned adjacent to a polarizer, penetration of moisture into the polarizer through an adhesive layer is reduced. In addition, when a protective film with low moisture permeability is directly attached to the main surface of the other side of the polarizer without interposing an adhesive layer, or is attached through an adhesive layer, the interface between the polarizer and the protective film or adhesive layer, an adhesive layer, an adhesive layer and penetration of moisture into the interior through the protective film is suppressed. Thus, it is thought that the discoloration of the polarizer by the action|action of water|moisture content is reduced by the penetration|invasion of moisture into a polarizer being reduced.

In an image display device, a lead wire of a driving element or a touch sensor is present on the outer periphery of a display unit on which an image is displayed. Therefore, in the optical laminated body used for an image display apparatus or an image display apparatus, the decorating layer is provided so that a lead wiring may not generally be seen from the outside. As described above, since the decorative layer is a member originally disposed in an image display device or an optical laminate, there is no need to newly use another member to reduce discoloration of the polarizer, and the original purpose of thinning and cost reduction using a non-protective polarizing film This is not damaged.

Moisture permeability can be measured based on JIS Z 0208:1976 "Testing method for moisture permeability of moisture-proof packaging material (cup method)". The test is conducted at a humidity of 40±0.5° C. and a relative humidity of 90%±2%. The value of the water vapor transmission rate is inversely proportional to the thickness of the sample to be measured. Therefore, the water vapor transmission rate when the thickness is 25 µm is obtained by multiplying the measured water vapor transmission rate value by the thickness (µm) of the sample and dividing by 25 µm. In addition, since the decorative layer is usually an extremely thin layer, the water vapor transmission rate (J _t ) of the laminate of the decorative layer and the substrate is measured, and from this water vapor transmission rate (J _t ) and the water vapor transmission rate of the substrate (J _sub ), the following formula Based on this, the moisture permeability (J) of the edible layer is obtained. Then, the moisture permeability (J) of the decorative layer is converted to the moisture permeability in the case of a thickness of 25 µm as described above.

1/J _t =1/J+1/J _sub

The moisture permeability (J _t ) of the laminate is measured in a state in which the substrate of the laminate is arranged so that the inside of the measuring cup and the decorative layer face the outside. A 25-micrometer-thick triacetyl cellulose film is used as a base material. The laminate is obtained by applying a coating agent containing the constituent components of the decorative layer to one main surface of the substrate in the order described later, or depositing the constituent components by a vapor phase method to form the decorative layer.

When the area of one main surface of the decorative layer is 25 cm ² or more, the moisture permeability of the decorative layer can be obtained from the laminate as described above. When the moisture permeability is obtained from the decorative layer in the actual polarizing film, the components of the decorative layer and the content ratio of each component are analyzed, and a laminate of the decorative layer and the substrate having the same composition is produced as described above, , the moisture permeability of the decorative layer can be obtained from this laminate. When the area of the main surface of one side of the decorative layer is ^{less than 25 cm 2} , the components of the decorative layer and the content ratio of each component are analyzed from the decorative layer in the actual polarizing film, and compared with the decorative layer whose moisture permeability is already known. , the moisture permeability can be inferred. The analysis of the constituent components of the edible layer and the content thereof is performed using, for example, at least one selected from the group consisting of nuclear magnetic resonance, mass spectrometry, gas chromatography, and liquid chromatography.

As mentioned above, in the polarizing film of this invention, discoloration in the polarizer at the time of exposure to a high-temperature, high-humidity environment can be reduced. For example, after the polarizing film is maintained at 60° C.±1° C. and 90%±2% relative humidity for 175 hours, the discoloration does not include a discolored part at the end of the polarizer, or even if it includes a discolored part, this discoloration The formed portion is formed as a region in which the distance from the cross section of the polarizer is less than 100 µm (preferably 80 µm or less). When the polarizing film is disposed on the main surface of the viewing side of the polarizer, even if a discolored portion is formed at the end of the polarizer, it is formed very close to the cross section, so that the discolored portion by the decorative layer can be hidden. have.

The shape of the polarizer is usually in the form of a film. Therefore, a polarizer is provided with a pair of main surfaces which occupy most of the area of the surface of a polarizer, and the cross section continuous with each main surface at the periphery of each main surface. A pair of main surfaces corresponds to said one main surface, and said other main surface located on the opposite side of this one main surface. The edge part of a polarizer shall say the cross section of a polarizer, and the part of its vicinity.

In this invention, the image display apparatus provided with the optical laminated body provided with the said polarizing film, the image display apparatus provided with this optical laminated body, and the said polarizing film are also contained. A polarizing film is provided with a pair of main surfaces which occupy most of the surface of a polarizing film. The main surface on the side of the visual recognition of a polarizing film is called a 1st main surface, and the main surface on the side opposite to a 1st main surface is called a 2nd main surface.

An optical laminated body is equipped with the said polarizing film, and at least one of a window member and retardation film. The window member is arranged on the side of the first main surface of the polarizing film, and the retardation film is arranged on the side of the second main surface of the polarizing film.

A display device is equipped with the said polarizing film or the said optical laminated body, and a panel member. A panel member is arrange|positioned about the 2nd main surface side about a polarizing film. A panel member is arrange|positioned about the optical laminated body on the side opposite to the visual recognition side.

In addition, in the lamination|stacking direction (in other words, the average thickness direction of each layer or each member) of each member which comprises each layer which comprises a polarizing film, an optical laminated body, or an image display device in this specification, each layer and each The relative positional relationship of the member (or the layer constituting each member) is sometimes shown using the expression "viewing side" or "opposite to the viewing side" of a polarizing film, an image display device, or an optical laminated body.

In this specification, the thickness of the member or layer which comprises a polarizing film, an optical laminated body, or an image display apparatus is a polarizing film, an optical laminated body, or an image display apparatus except the case of the thickness of 25 micrometers regarding the regulation of water vapor transmission rate. A cross section is cut out, and the average thickness measured based on the image by the scanning electron microscope (SEM) of the said cross section shall be meant. The average thickness is calculated|required by measuring and averaging the thickness at arbitrary plural places (for example, five places) in the image of the said cross section.

Below, the structure of a polarizing film, an optical laminated body, and an image display apparatus is demonstrated more concretely.

(polarizing film)

The polarizing film includes (i) a polarizer, a first decorative layer and a first adhesive layer adhered to one main surface of the polarizer, and a second decorative layer and a second adhesive layer adhered to the other main surface of the polarizer. The case and (ii) the case of providing a polarizer, the 1st decorating layer and 1st adhesive layer adhere|attached to one main surface of a polarizer, and the protective film adhered to the other main surface of a polarizer are included. The polarizing film may further be equipped with the 1st separator arrange|positioned on the opposite side to the polarizer of a 1st adhesion layer. When a polarizing film is equipped with a 2nd adhesion layer, the polarizing film may further be equipped with the 2nd separator arrange|positioned on the opposite side to the polarizer of a 2nd adhesion layer. When each separator is peeled and each adhesion layer is affixed to another member, a polarizing film can be laminated|stacked on another member.

(polarizer)

It does not restrict|limit especially as a polarizer, What is used for the image display apparatus field|area etc. can be used. Examples of the polarizer include a film obtained by adsorbing a dichroic substance to a hydrophilic polymer film and uniaxially stretching, and a polyene-based oriented film. Examples of the hydrophilic polymer constituting the hydrophilic polymer film include polyvinyl alcohol-based resins (including partially formalized polyvinyl alcohol-based resins) and partially saponified products of an ethylene-vinyl acetate copolymer. Examples of the dichroic substance include iodine and dichroic dye. As a material which comprises a polyene-type oriented film, the dehydration-processed material of polyvinyl alcohol-type resin, and the dehydrochloric acid-treated material of polyvinyl chloride-type resin are mentioned, for example.

The thickness of the polarizer may be, for example, 1 µm or more and 30 µm or less, and may be 2 µm or more and 15 µm or less or 3 µm or more and 10 µm or less.

(1st edible layer and 2nd edible layer)

The first decorative layer is directly adhered to the peripheral portion of one main surface of the polarizer without an adhesive layer interposed therebetween. The second decorative layer is directly adhered to the periphery of the main surface of the other side of the polarizer without interposing an adhesive layer. Thereby, while suppressing the penetration of moisture inside through the adhesive layer, penetration of moisture inside through the interface between the polarizer and the decorative layer is reduced. Therefore, although the adhesive layer, which tends to have a high water vapor transmission rate, is disposed adjacent to the polarizer, it is possible to effectively reduce the penetration of moisture into the polarizer through the adhesive layer.

Each decoration layer is provided on the outer periphery of the display part on which an image is displayed so that the lead-out wiring of a drive element or a touch sensor may not be visually recognized from the outside. Therefore, each decorative layer should just have a shape which can hide the lead-out wiring etc., and may be formed in at least a part of the peripheral part of the main surface of a polarizer. From the viewpoint of further enhancing the effect of suppressing the ingress of moisture into the polarizing film, it is preferable to form in a frame-like pattern so as to surround the inner region in the main surface in the entire periphery. In addition, from the viewpoint of increasing the effect of suppressing discoloration in the polarizer, it is preferable that the cross section of the polarizer is located on the same plane as the end surface of each decorative layer, or located inside the end surface of each decorative layer.

When the moisture permeability of the thickness of the decorative layer is 25㎛, 1500g / m ² · 24h or less, and if, a 1300g / m ² · 24h or less than 1200g / m ² · 24h or less is more preferable. The moisture permeability lower limit value when the thickness of the decorative layer 25㎛ is not particularly limited, for example, not less than 500g / m ² · 24h, or may be 1000g / m ² · 24h or more. These upper and lower limits can be combined arbitrarily.

The thickness of the decorative layer is, for example, 3 µm or more. From the viewpoint of further enhancing the effect of suppressing the penetration of moisture in the thickness direction of the edible layer, the edible layer is preferably 5 µm or more, and may be 6 µm or more. The thickness of the decorative layer is, for example, 20 µm or less, and may be 15 µm or less. From the viewpoint of easily eliminating the level difference along the decorative layer by the adhesive layer, the thickness of the decorative layer is preferably 10 µm or less, and may be 8 µm or less. Moreover, when the thickness of a decorating layer is such a range, it is easy to ensure the high bending resistance of an image display apparatus and an optical laminated body. These lower limits and upper limits can be combined arbitrarily.

The width of each decorative layer is, for example, 0.1 mm or more. From the viewpoint of increasing the effect of suppressing the penetration of moisture through the decorative layer and the interface between the decorative layer and the polarizer, the width of each decorative layer is preferably 0.5 mm or more, and may be 1 mm or more. The upper limit of the width of each decorative layer may be selected within a range that can ensure the visibility and concealment of the wiring or the like. For example, 30 mm or less may be sufficient, and 20 mm or less may be sufficient as it. These lower limits and upper limits can be combined arbitrarily.

The width of the decorative layer is a polarizing film, and the width of the decorative layer when viewed from a direction perpendicular to the main surface of the polarizer is measured at 30 arbitrary places, and 10 values from the smaller one are averaged. You may calculate|require the width|variety of a decorating layer with respect to the polarizing film which peeled and took out another member with an optical laminated body or an image display apparatus.

In addition to not reflecting light from the viewing side, the decorative layer is required to shield light from the side opposite to the viewing side. Examples of the decorative layer include an ink layer, a metal thin film, and a metal fine particle-containing layer (thin film). A single layer structure may be sufficient as a decoration layer, and a laminated structure may be sufficient as it. The decorative layer of the laminated structure may be, for example, a laminate of at least two layers selected from the group consisting of an ink layer, a metal thin film, and a layer containing fine metal particles. Such a laminate includes not only a laminate including at least two layers selected from the group consisting of an ink layer, a metal thin film and a layer containing fine metal particles, but also a laminate of two or more ink layers having different compositions, and two layers with different compositions. Also included are a laminate of the above metal thin films, a laminate of two or more layers containing fine metal particles having different compositions, and the like. The metal fine particle-containing layer contains, for example, metal fine particles and a binder resin. In a laminate, it is preferable that adjacent layers or thin films are directly adhered without an adhesive layer interposed therebetween.

Among the decorative layers, the ink layer or the metal fine particle-containing layer is formed by, for example, applying a coating agent (including ink) containing the constituent components of the decorative layer to the main surface of the polarizer and solidifying the coating film of the coating agent. The coating film can be solidified by at least one selected from drying, heating and exposure. The coating agent includes, for example, fine particles exhibiting hiding properties, a resin binder, and, if necessary, a liquid medium. A coating agent may contain an additive as needed.

As microparticles|fine-particles which exhibit hiding property, a pigment and inorganic microparticles|fine-particles are mentioned, for example. As a pigment, an inorganic pigment (carbon black etc.), a dispersion type organic pigment, and a dissolution type fluorescent pigment are mentioned, for example. Examples of the inorganic fine particles include fine particles of inorganic components other than pigments. Examples of the inorganic component include metals, alloys, metal compounds (oxides, nitrides, etc.), carbonaceous materials (graphitized carbon, etc.). The microparticles|fine-particles which exhibit hiding property may be used individually by 1 type, and may be used in combination of 2 or more type.

As a resin binder, a thermoplastic resin, curable resin (thermosetting resin, photocurable resin, etc.), etc. are mentioned. A thermoplastic resin, especially, a cyclic olefin resin and an acrylic resin are preferable from a viewpoint of being easy to obtain a lower water vapor transmission rate and ensuring high dispersion stability in a coating agent. A resin binder may be used individually by 1 type, and may be used in combination of 2 or more type.

As the liquid medium, depending on the components of the coating agent, for example, an organic liquid medium, water, and mixtures thereof are used. It is preferable to use an organic liquid medium (ethanol, isopropanol, glycol ether, etc.) as a liquid medium. A liquid medium may be used individually by 1 type, and may be used in combination of 2 or more type.

A well-known thing can be used as an additive, For example, a dispersing agent, surfactant, and a coupling agent are mentioned. However, the additive is not limited thereto.

The decorative layer may be formed by a vapor phase method. More specifically, the metal thin film in the decorative layer may be formed by, for example, depositing constituent components on the main surface of the polarizer by a vapor phase method. As the vapor phase method, a sputtering method, a vacuum deposition method, a chemical vapor deposition (CVD: Chemical Vapor Deposition) method, an electron beam deposition method, and the like can be given.

(first adhesive layer and second adhesive layer)

The first adhesive layer is formed so as to cover a surface of the first decorative layer on the opposite side to the polarizer and a region on one main surface of the polarizer to which the first decorative layer is not adhered. The second adhesive layer is formed so as to cover a surface of the second decorative layer on the opposite side to the polarizer and a region on the other main surface of the polarizer to which the second decorative layer is not adhered.

The storage elastic modulus in 25 degreeC of each adhesion layer may be 10 MPa or less normally, 3 MPa or less may be sufficient, 1 MPa or less may be sufficient, and 0.2 MPa or less or 0.1 MPa or less may be sufficient as it. When the storage elastic modulus of an adhesive layer is such a range, while high adhesiveness can be ensured, unlike the case of the hardened adhesive layer, it is easy to relieve the stress by pressurization. 0.001 MPa or more may be sufficient as the storage elastic modulus in 25 degreeC of each adhesion layer, and 0.005 MPa or more may be sufficient as it. These upper and lower limits can be combined arbitrarily.

On the other hand, the storage elastic modulus at 25 degreeC of an adhesive layer is larger than 10 MPa, and may be 100 MPa or more, and is usually about 1 GPa. In this specification, an adhesive layer shall mean what has such a storage elastic modulus.

As such, the adhesive layer is distinguished from the adhesive layer by the storage modulus.

The storage elastic modulus of an adhesive layer can be measured based on JISK7244-1:1998. Specifically, first, a molded article having a thickness of about 1.5 mm is produced using the pressure-sensitive adhesive layer or the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer. This molded product was punched into a disk shape having a diameter of 7.9 mm to prepare a test piece. This test piece is sandwiched in a parallel plate, and the viscoelasticity is measured under the following conditions using a dynamic viscoelasticity measuring device (for example, "Advanced Rheometric Expansion System (ARES)" manufactured by Rheometric Scientific), and the storage modulus at 25°C is measured. save In addition, the storage elastic modulus of an adhesive layer is also calculated|required according to the case of an adhesive layer.

(Measuring conditions)

Deformation mode: torsion

Measuring frequency: 1Hz

Measuring temperature: -40℃~+150℃

Temperature rising temperature: 5°C/min

From a viewpoint of ensuring high visibility of a panel member when it uses for an image display apparatus, 85 % or more is preferable and, as for the total light transmittance of each adhesion layer, 90 % or more is more preferable.

The total light transmittance of an adhesion layer can be measured based on JISK7136K:2000. The test piece which arrange|positioned the adhesive which comprises an adhesive layer or an adhesive layer until it becomes a thickness of about 1.5 mm is used for measurement in alkali-free glass (thickness 0.8-1.0 mm, total light transmittance 92%).

Each adhesive layer is comprised by an adhesive. The type of the pressure-sensitive adhesive is not particularly limited, and for example, an acrylic pressure-sensitive adhesive, a rubber-based pressure-sensitive adhesive, a silicone-based pressure-sensitive adhesive, a urethane-based pressure-sensitive adhesive, a vinyl alkyl ether-based pressure-sensitive adhesive, a polyvinylpyrrolidone-based pressure-sensitive adhesive, a polyacrylamide-based pressure-sensitive adhesive, and a cellulose-based pressure-sensitive adhesive. . The pressure-sensitive adhesive includes, for example, a base polymer, a crosslinking agent, an additive (such as a tackifier, a coupling agent, a polymerization inhibitor, a crosslinking retarder, a catalyst, a plasticizer, a softener, a filler, a colorant, a metal powder, an ultraviolet absorber, a light stabilizer, an antioxidant, deterioration Anti-oxidants, surfactants, antistatic agents, surface lubricants, leveling agents, corrosion inhibitors, particles of inorganic or organic materials (metal compound particles (metal oxide particles, etc.), resin particles, etc.) may be included. The constituent components of the pressure-sensitive adhesive are not limited thereto.

The adhesive constituting each of the first adhesive layer and the second adhesive layer may be the same or different.

The thickness of each adhesive layer may be 50 micrometers or less, 40 micrometers or less, or 30 micrometers or less may be sufficient as it. From a viewpoint of easy ensuring the high flexibility of an image display apparatus or an optical laminated body, 5 micrometers or more are preferable, respectively, and 7 micrometers or more may be sufficient as the thickness of each adhesive layer, respectively. The thickness of each adhesive layer is preferably 10 µm or more from the viewpoint of easily absorbing the level difference of the decorative layer.

From the viewpoint of absorbing the level difference due to the decorative layer, the thickness of each adhesive layer may be 1.5 times or more, 2.5 times or more, or 3 times or more of the thickness of the decorative layer to be adhered.

The upper limit and lower limit of the thickness of the adhesive layer described above can be arbitrarily combined.

Each adhesive layer is, for example, in a state where the decorative layer is adhered to the periphery of the main surface of the polarizer, to cover the surface of the decorative layer on the opposite side to the polarizer and the area to which the decorative layer of the polarizer is not adhered. It can form by apply|coating an adhesive or transferring the adhesive shape|molded in sheet shape. When transferring the pressure-sensitive adhesive, the pressure-sensitive adhesive formed into a sheet on the surface of the first separator or the second separator may be transferred together with the separator.

(first separator and second separator)

As each separator, the release sheet provided with the release agent arrange|positioned on at least one main surface of a base material sheet and a base material sheet is used, for example. Each separator is disposed in a state in which the release agent is in contact with the first adhesive layer or the second adhesive layer (more specifically, the surface on the opposite side to the polarizer of each adhesive layer).

What is necessary is just to have moderate intensity|strength and softness|flexibility as a base material sheet, and to which the layer of a release agent can be formed easily. As the base sheet, a resin film, paper, or a laminate thereof is used. The material of the base sheet is determined depending on the type of the release agent, other configurations of the polarizing film, and the like. As the resin film, for example, a polyester film (such as a polyethylene terephthalate film) or a polyolefin film (such as a polypropylene film) may be used. The thickness in particular of a base material sheet is not restrict|limited, either, It can select in consideration of desired peelability. As a release agent, a well-known thing can be used and it is preferable to select the thing with little residual amount to the separator of an adhesion layer. For example, a silicone-based release agent and a fluorine-based release agent may be used.

(protective film)

A protective film is directly adhere|attached to the other main surface of a polarizer without interposing an adhesive layer, or is adhere|attached through an adhesive layer. A protective film is arrange|positioned so that the whole main surface of the other side of a polarizer may be covered.

Water vapor transmission rate at which the thickness of the protective film 25㎛ days 1500g / m ² · 24h or less, and if, 1000g / m ² · 24h or less, and preferably, 700g / m ² · 24h or less than that, or 500g / m ² · 24h or less desirable. The moisture permeability lower limit value when the thickness of the protective film 25㎛ is not particularly limited, for example, more than 50g / m ² · 24h, or may be 100g / m ² · 24h or more. These upper and lower limits can be combined arbitrarily.

As the protective film, a polymer film excellent in transparency, mechanical strength, thermal stability, moisture barrier properties, and optical isotropy while exhibiting the low moisture permeability as described above is used. As a polymeric material which has such a property, it is preferable that a protective film contains at least 1 sort(s) chosen from the group which consists of an acrylic resin and a cyclic polyolefin resin. The protective film containing these resins has a low water vapor transmission rate and can further heighten the effect of reducing the discoloration of a polarizer.

As an acrylic resin, the homopolymer or copolymer containing the unit of at least 1 sort(s) of monomer chosen from the group which consists of an alkylacrylate and an alkylmethacrylate is mentioned. 1-4 are preferable and, as for carbon number of the alkyl part of an alkylacrylate and an alkylmethacrylate, 1 or 2 may be sufficient as it. From a viewpoint of being excellent in transparency, heat resistance and moisture resistance, it is preferable to use the acrylic resin (namely, a methacrylic resin) containing at least a methyl methacrylate unit as an acrylic resin.

The acrylic resin may have a ring structure in the main chain. As such a ring structure, an imide ring structure is preferable from a viewpoint of being excellent in heat resistance and moisture resistance. Examples of the imide ring structure include a glutarimide structure and an N-substituted maleimide structure (eg, a cyclohexylmaleimide structure, a methylmaleimide structure, a phenylmaleimide structure, and a benzylmaleimide structure). It is preferable that an acrylic resin contains the methacryl resin which has an imide ring structure in a principal chain.

As cyclic polyolefin resin, the homopolymer or copolymer which used cyclic olefins, such as norbornene and dicyclopentadiene, as a monomer, is mentioned, for example. Cyclic olefins also include those having a substituent (eg, 1-methylnorbornene, 4-methylnorbornene, and 4-phenylnorbornene). The cyclic polyolefin resin using norbornene may be obtained by ring-opening polymerization of norbornene, or may be obtained by addition polymerization.

In addition to the said resin, a protective film may contain other resin. Although it does not restrict|limit especially as another resin, For example, Cellulose-type resin, polyolefin resin other than cyclic polyolefin, imide-type resin (including phenylmaleimide-type resin), polyamide-type resin, polycarbonate-type resin, polyester-type resin (including polyarylate-based resins (polyethylene terephthalate resin, etc.)), acetate-based resins, sulfone-based resins (including polyethersulfone-based resins), polyvinyl chloride-based resins, polyvinylidene chloride-based resins, polystyrene-based resins and resins, polyvinyl alcohol-based resins, sulfide-based resins (eg, polyphenylene sulfide-based resins), polyetheretherketone-based resins, epoxy-based resins, and urethane-based resins. The ratio of the other resins is adjusted so that the moisture permeability of the protective film is within the above range.

The thickness of the protective film is, for example, 20 µm or more. From a viewpoint that the moisture permeability of the whole protective film is reduced and the effect which suppresses the penetration|invasion of the water|moisture content in thickness direction becomes still higher, 35 micrometers or more are preferable and, as for the thickness of a protective film, 40 micrometers or more are more preferable. Although the upper limit in particular of the thickness of a protective film is not restrict|limited, 100 micrometers or less may be sufficient and 60 micrometers or less may be sufficient. These lower limits and upper limits can be combined arbitrarily.

(Adhesive layer)

The adhesive layer is a layer of a cured product of the adhesive. As an adhesive agent, the hardening-type adhesive agent used for a polarizing film can be used. Examples of such adhesives include active energy ray-curable adhesives (UV-curable adhesives, electron beam-curable adhesives, etc.) and thermosetting adhesives. Examples of such adhesives include, but are not limited to, acrylic adhesives, epoxy adhesives, and urethane adhesives.

The storage modulus at 25°C of the adhesive layer is in the above-mentioned range. Although the upper limit in particular of the storage elastic modulus in 25 degreeC of an adhesive bond layer is not restrict|limited, For example, it is 15 GPa or less, and 10 GPa or less may be sufficient. These upper limits and the lower limit of the storage elastic modulus at 25 degreeC of the above-mentioned adhesive layer can be combined arbitrarily.

The thickness of the adhesive layer is, for example, 5 µm or less. From a viewpoint of further reducing penetration of moisture through an adhesive layer, 3 micrometers or less are preferable and, as for the thickness of an adhesive layer, 2 micrometers or less or 1.5 micrometers or less are more preferable. From a viewpoint of further reducing moisture penetration through the interface between a polarizer and a protective film, 0.5 micrometer or more is preferable and, as for the thickness of an adhesive layer, 0.8 micrometer or more, or 1 micrometer or more is more preferable. These upper and lower limits can be combined arbitrarily.

A polarizing film is, for example, laminating a polarizer directly on one main surface of the protective film without interposing an adhesive layer, or laminating a polarizer through an adhesive layer, and a first decorative layer on the main surface opposite to the protective film of the polarizer It can be formed and formed by transferring the separately formed first adhesive layer (and, if necessary, the first separator) so as to cover the region to which the first decorative layer and the first decorative layer of the polarizer are not adhered. Further, the polarizing film, for example, forms a first decorative layer on one main surface of the polarizer in the same manner as above, and transfers the first adhesive layer (and, if necessary, the first separator) to the other main surface of the polarizer. , You may form a protective film by laminating|stacking directly through lamination|stacking or a contact bonding layer without interposing an adhesion layer. The polarizing film is, for example, on one main surface of the polarizer in the same manner as described above to form a first decorative layer and transfer the first adhesive layer (and, if necessary, a first separator), as in the case of the first decorative layer. Similarly, a second decorative layer is formed on the main surface of the other side of the polarizer, and as in the case of the first adhesive layer (and the first separator), by transferring the second adhesive layer (and, if necessary, the second separator) may be formed.

(Optical laminate and image display device)

The optical laminate may be equipped with the said polarizing film, and at least one of a window member and retardation film. An image display apparatus is equipped with the said polarizing film or an optical laminated body, and a panel member. The optical laminate or the image display device may further include a touch sensor. Or you may use a panel member with a touch sensor as a panel member. An optical laminated body or an image display apparatus may be equipped with the adhesion layer or adhesive layer which adhere|attaches between adjacent members (or layers). When a polarizing film contains at least one of a 1st separator and a 2nd separator, an image display apparatus contains the polarizing film of the state which peeled the 1st separator and the 2nd separator. The optical laminated body may contain the polarizing film in the state which a polarizing film peeled at least one of a 1st separator and a 2nd separator.

In the optical laminate or image display device, the window member is disposed on the first major surface side of the viewing side of the polarizing film, and the retardation film is disposed on the second major surface side opposite to the viewing side of the polarizing film. The panel member is disposed on the second main surface side of the polarizing film. In addition, when the 1st main surface of a polarizing film is one main surface side of a polarizer, a 2nd main surface is the other main surface side of a polarizer. Moreover, when the 1st main surface of a polarizing film is the other main surface side of a polarizer, a 2nd main surface is one main surface side of a polarizer. When the polarizing film includes a protective film, the protective film may be located on one of the first main surface side and the second main surface side, but from the viewpoint of protecting the surface on the viewer side, it is preferable to position the protective film on the first main surface side It is advantageous.

(No window)

The window member is disposed on the outermost surface of the image display device or the optical layered body on the visual recognition side to prevent damage to other members constituting the optical laminate such as a polarizing film or the image display device.

The window member typically includes at least one layer selected from the group consisting of a window film and a window glass. High transparency (high total light transmittance, low haze, etc.) and high hardness are requested|required of an optical laminated body or an image display apparatus. Moreover, in addition to these physical properties, the flexible image display apparatus is calculated|required still higher flexibility (high commutability, etc.). The material of the window film or the window glass is not particularly limited as long as it satisfies these physical properties.

As window glass, a thin glass substrate is mentioned, for example.

The thickness of the window glass may be, for example, 5 µm or more and 40 µm or less, and may be 10 µm or more and 35 µm or less.

As a window film, a transparent resin film is mentioned, for example. Examples of the resin constituting the transparent resin film include acrylic resins, cyclic polyolefin resins, and other resins (e.g., polyester-based resins such as imide-based resins and polyethylene terephthalate resins) exemplified as materials for protective films contained in polarizing films. At least 1 sort(s) selected from the group which consists of resin) is mentioned. However, the resin constituting the transparent resin film is not limited thereto.

The thickness of the window film may be, for example, 20 µm or more and 500 µm or less, and may be 30 µm or more and 200 µm or less.

In this specification, with respect to the member (molded object) which comprises a polarizing film, an optical laminated body, and an image display apparatus, or its material, a transparent thing means that the total light transmittance of a test piece is 80 % or more. For the measurement of the total light transmittance, a test piece made of a transparent material or member and having a thickness of about 1.5 mm is used. The total light transmittance can be measured according to the case of the adhesive layer.

The window member may be provided with a hard-coat layer. The hard coat layer is typically laminated with the window film. It is preferable that the hard-coat layer is provided in the surface of the visual recognition side of a window film at least from a viewpoint in which the high damage prevention effect of a window film is easy to be acquired.

The thickness of the hard-coat layer may be, for example, 1 µm or more and 100 µm or less, and may be 1 µm or more and 50 µm or less. When a window member is provided with a some hard-coat layer, what is necessary is just to make the thickness of each hard-coat layer into such a range.

The hard coat layer is formed by, for example, applying a curable coating agent to the surface of a layer serving as a base (eg, a window film) and curing it.

As a coating agent, the thing for an optical film use can be used, for example. Examples of the coating agent include, but are not limited to, an acrylic coating agent, a melamine coating agent, a urethane coating agent, an epoxy coating agent, a silicone coating agent, and an inorganic coating agent.

The coating agent may contain an additive. Examples of additives include silane coupling agents, colorants, dyes, powders or particles (pigments, inorganic or organic fillers, particles of inorganic or organic materials, etc.), surfactants, plasticizers, antistatic agents, surface lubricants, leveling agents, antioxidants , a light stabilizer, an ultraviolet absorber, a polymerization inhibitor, an antifouling agent, and the like, but is not limited thereto.

The window member may be provided with another layer (henceforth a layer A) as needed. Examples of the layer A include an antireflection layer, an antiglare layer, an antifouling layer, an antistick layer, a color adjustment layer, an antistatic layer, an easily adhesive layer, a precipitation prevention layer such as ions or oligomers, an impact absorbing layer, and a scattering prevention layer. The window member may contain one layer of the layer A, and may contain multiple layers. Layer A is, for example, one layer constituting the window member (eg, a window film or window glass) or a laminate of two or more layers (eg, a laminate of a window film and a hard coat layer) on the visual side surface side Alternatively, it is provided on the surface opposite to the viewer side. The layer A may be directly formed by coating or the like on the layer constituting the window member, or may be laminated through an adhesive layer or an adhesive layer.

The thickness of the window member may be, for example, 0.02 mm or more and 0.6 mm or less, and may be 0.03 mm or more and 0.3 mm or less.

(retardation film)

As retardation film, the retardation film used for an optical laminated body, an image display apparatus, etc. is mentioned, for example. Examples of the retardation film include a uniaxial or biaxial retardation film, a liquid crystal film having a liquid crystal twist orientation or a liquid crystal oblique orientation, a 1/2 wave plate, and a 1/4 wave plate. The optical laminate may contain the retardation film of one layer, and may contain the laminated body of the retardation film of two or more layers.

The thickness of the retardation film is, for example, 10 µm or more and 100 µm or less, and may be 15 µm or more and 60 µm or less.

The retardation film may be laminated|stacked directly on the protective film using a coating etc., and may be laminated|stacked through an adhesive layer. Moreover, the retardation film may be affixed on the 1st adhesive layer or the 2nd adhesive layer.

A laminated body provided with a polarizing film and retardation film may be generally called an optical film. The optical film may further be equipped with layers (layer B) other than a polarizing film and retardation film as needed.

(Layer B)

As layer B, optically anisotropic films other than a polarizer and retardation film, and a base material layer (or protective layer) are mentioned, for example.

Examples of the optically anisotropic film other than the polarizer and the retardation film include, but are not limited to, a viewing angle magnifying film, a viewing angle limiting (anti-peeping) film, a brightness enhancing film, and an optical compensation film. The optical laminate or the image display device may contain one layer of these optically anisotropic films, and may contain two or more layers.

Another optically anisotropic film may be laminated|stacked directly on the adjacent layer (for example, retardation film) using coating etc., and may be laminated|stacked on the adjacent layer through an adhesive layer or an adhesive layer.

As the base layer, a thin glass substrate, a polymer film, or the like is used. As a polymeric material which comprises a polymeric film, at least 1 sort(s) chosen from the group which consists of an acrylic resin illustrated as a material of the protective film contained in a polarizing film, a cyclic polyolefin resin, and other resin is mentioned. From the viewpoint of thinning, it is preferable that the optical film does not include such a base layer.

The thickness in particular of the layer B is not restrict|limited, For example, it is 0.1 micrometer or more and 100 micrometers or less.

(touch sensor)

As a touch sensor, what is used for the field|area of an image display apparatus etc. is used, for example. The touch sensor may be, for example, a resistive film type, a capacitive type, an optical type, or an ultrasonic type, but is not limited thereto. When a capacitive touch sensor is used, high sensitivity is easily obtained.

Capacitive touch sensors typically include a transparent conductive layer. As such a touch sensor, the laminated body of a transparent conductive layer and a transparent base material is mentioned, for example. As a transparent base material, a transparent film is mentioned, for example.

Although it does not restrict|limit especially for a transparent conductive layer, A conductive metal oxide, a metal nanowire, etc. are used. Examples of the metal oxide include indium oxide (ITO: Indium Tin Oxide) containing tin oxide and tin oxide containing antimony. The transparent conductive layer may be a conductive pattern composed of a metal oxide or a metal. Examples of the shape of the conductive pattern include, but are not limited to, stripe shape, square shape, lattice shape, and the like.

The surface resistance value of the transparent conductive layer may be, for example, 0.1 Ω/□ or more and 1000 Ω/□ or less, and may be 0.5 Ω/□ or more and 500 Ω/□ or less.

The thickness of the transparent conductive layer may be, for example, 0.005 µm or more and 10 µm or less, and may be 0.01 µm or more and 3 µm or less.

As the transparent film, for example, a transparent resin film is used. As resin which comprises a transparent resin film, at least 1 sort(s) chosen from the group which consists of the acrylic resin illustrated as a material of the protective film contained in a polarizing film, cyclic polyolefin resin, and other resin is mentioned. Among them, polyester-based resins, polyimide-based resins and polyethersulfone-based resins are preferable. However, the resin constituting the transparent resin film is not limited to these resins.

From a viewpoint of improving the adhesiveness of a transparent conductive layer and a transparent base material, you may use what was surface-treated as a transparent base material. A well-known thing can be employ|adopted as surface treatment. If necessary, prior to lamination of the transparent conductive layer, the transparent substrate may be subjected to, for example, vibration damping or cleaning treatment (such as cleaning treatment using a solvent or ultrasonic wave).

The touch sensor may include other layers other than the transparent conductive layer and the transparent base material (hereinafter referred to as layer C) as needed. For example, an undercoat layer or an oligomer precipitation preventing layer may be provided as the layer C between the transparent conductive layer and the transparent substrate. Moreover, you may laminate|stack the layer C on the surface of at least one of a transparent conductive layer and a transparent base material. However, the layer C is not limited to these layers. If necessary, the layer C may be laminated on the transparent conductive layer or the transparent substrate via an adhesive layer or an adhesive layer.

The thickness of the whole touch sensor may be, for example, 0.005 mm or more and 0.25 mm or less, and may be 0.01 mm or more and 0.2 mm or less.

(Adhesive layer and separator)

The optical laminate may be provided with the adhesion layer for affixing and laminating|stacking on other members which comprise image display apparatuses, such as a panel member. The optical laminated body may further be equipped with the separator (3rd separator) which covers such an adhesion layer. The configuration of the adhesive layer may refer to the description of the first adhesive layer and the second adhesive layer. For the configuration of the third separator, the description of the first separator and the second separator may be referred to. According to the laminated constitution of the optical laminate, the adhesive layer may be disposed on one of the main surface side on the visual side of the optical laminate and the main surface side on the opposite side to the visual side, or may be arranged on both main surface sides. The optical laminated body provided with a 3rd separator is used for the image display apparatus in the state which peeled the 3rd separator.

When an optical laminated body contains a polarizing film in the state provided with at least one of a 1st separator and a 2nd separator, it is used for an image display apparatus in the state which peeled each separator.

(Panel member)

The panel member included in the image display device includes, for example, at least an image display panel. A sealing member (thin film sealing layer, etc.) may be arrange|positioned on the visual recognition side of an image display panel. The sealing member is normally arrange|positioned directly on the main surface of the visual recognition side of an image display panel.

A well-known thing is used as an image display panel. As an image display panel, an organic electroluminescence (EL:Electro Luminescence) panel is mentioned, for example.

(no protection)

The image display apparatus may contain the laminated body of a panel member and a protection member. As a protective member, the sheet|seat or film (or board|substrate) which hold|maintains or protects a panel member is mentioned, for example. The protection member should just have moderate flexibility which does not impair the moderate intensity|strength for protecting a panel member, and the flexibility of a flexible image display apparatus while holding a panel member. As the protective member, a resin sheet or the like is used. The material in particular of the resin sheet is not restrict|limited, For example, it can select suitably according to the kind of image display panel.

(Panel member with touch sensor)

The image display device may include a panel member with a touch sensor. The panel member with a touch sensor integrates a touch sensor and a panel member. When the image display apparatus is provided with a panel member with a touch sensor, another touch sensor as described above is unnecessary.

Such a panel member with a touch sensor includes, for example, a structure in which a metal mesh electrode antistatic capacitive touch sensor is formed on a thin film encapsulation layer of an organic light emitting diode (OLED). As a touch sensor, you may refer to the description above. However, the panel member with a touch sensor shall not contain an adhesion layer.

About the panel member which comprises the panel member with a touch sensor, the description of the said panel member can be referred.

The panel member with a touch sensor may be equipped with the protection member. As the protective member, reference may be made to the above description.

The thickness of the whole panel member with a touch sensor may be 0.005 mm or more and 0.1 mm or less, and 0.01 mm or more and 0.05 mm or less may be sufficient, for example.

(etc)

The optical laminate or the image display device may include decorative layers other than the first decorative layer and the second decorative layer (third decorative layer) as needed. An optical laminate or an image display device may contain one-layer 3rd decorating layer, and may also contain the 3rd decorating layer of two or more layers. The 3rd decorating layer is arrange|positioned in the state in contact with an adhesive layer on the visual recognition side rather than a touch sensor or a panel member with a touch sensor, for example. The 3rd decorating layer may be contained in members other than a polarizing film. Although the 3rd decorating layer may be contained in a polarizing film, it is not adhere|attached to a polarizer.

The third decorative layer may be an ink layer, a metal thin film, a metal fine particle-containing layer, a laminate, or the like, as described for the first decorative layer and the second decorative layer.

The thickness of the third decorative layer is, for example, 20 µm or less, and may be 15 µm or less. From the viewpoint of ensuring a higher hiding effect of the lead wiring, the thickness of the third decorative layer may be 10 nm or more, 30 nm or more, or 50 nm or more. These upper and lower limits can be combined arbitrarily.

When the third decorative layer is formed using a coating agent, a primer layer may be disposed on the surface of the member or layer (excluding the adhesive layer) to which the coating agent is applied prior to application. The primer layer contains, for example, at least one selected from the group consisting of a metal compound (metal oxide, metal nitride, metal carbide, metal sulfide, etc.) and a resin material. The primer layer is preferably transparent.

The thickness of the primer layer is, for example, 500 nm or less, and may be 100 nm or less or 30 nm or less.

The optical laminate and the image display device can each be formed, for example, by laminating constituent members. The order of lamination is not particularly limited, and may be determined in consideration of workability and the like. Lamination may be performed while disposing an adhesive layer or an adhesive layer between the members (or layers) to be laminated.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic sectional drawing of the flexible image display apparatus of one Embodiment of this invention. The flexible image display device 1 includes a window member 13 , an optical film 10 including a polarizing film 11 , and a laminate of a touch sensor 14 and a panel member 15 . The touch sensor 14 and the panel member 15 constitute a panel member with a touch sensor as described above. The optical film 10 and the window member 13 are laminated with the adhesive layer 22 interposed therebetween. An adhesive layer 23 is interposed between the touch sensor 14 and the optical film 10 . In FIG. 1, for example, the laminated body of the structure except the touch sensor 14 and the panel member 15, and a 3rd separator (not shown) corresponds to an optical laminated body.

The window member 13 is adhered to the first main surface of the polarizing film 11 with an adhesive layer 22 interposed therebetween. The window member 13 includes, for example, a window film 131 and a hard coat layer 132 laminated on the window film 131 . The hard coat layer 132 is provided on the side opposite to the optical film 10 side of the window member 13 .

The optical film 10 includes a polarizing film 11 and a retardation film 12 adhered to the second main surface of the polarizing film 11 . The polarizing film 11 is a polarizer 111, a first decorative layer 112a and a first adhesive layer 113a adhered to one main surface of the polarizer 111, and the other main surface of the polarizer 111. A protective film 114 is provided with an adhesive layer 115 interposed therebetween. The first decorative layer 112a is directly adhered to the peripheral portion of one main surface of the polarizer 111 without an adhesive layer interposed therebetween. The first adhesive layer 113a is formed to cover the main surface of the first decorative layer 112a opposite to the polarizer 111 and a region to which the first decorative layer 112a of the polarizer 111 is not adhered. . The main surface of the protective film 114 on the opposite side to the polarizer 111 corresponds to the first main surface of the polarizing film 11 , and the main surface of the first adhesive layer 113a on the opposite side to the polarizer 111 is polarized light. It corresponds to the 2nd main surface of the film 11.

Each of the 1st decorating layer 112a and the protective film 114 has a water vapor transmission rate of 1500 g/m<^2> *24h or less when thickness is 25 micrometers. As described above, in the polarizing film 11 , the first decorative layer 112a having a low water vapor transmission rate is directly bonded to the peripheral portion of one main surface of the polarizer 111 without an adhesive layer interposed therebetween, and the low water vapor transmission rate protective film 114 . ) is adhered to the other main surface of the polarizer 111 via an adhesive layer. Thereby, penetration of the water|moisture content into the polarizing film 11 from the side surface of the polarizing film 11 is reduced. Therefore, discoloration in the polarizer 111 can be reduced.

In FIG. 1 , the protective film 114 is disposed on the first main surface side, and the first decorative layer 112a and the first adhesive layer 113a are disposed on the second main surface side, but the protective film 114 is removed. It may be arrange|positioned on two main surface side surfaces, and you may arrange|position the 1st decorating layer 112a and the 1st adhesive layer 113a on the 1st main surface side.

Fig. 2 is a schematic cross-sectional view of a flexible image display device according to another embodiment of the present invention. As for the flexible image display apparatus 101 of FIG. 2, only the structure of the polarizing film 11 differs from FIG. 1, the structure other than that is the same as that of FIG. 1, and description of FIG. 1 can be referred.

The polarizing film 11 of the image display apparatus 101 is replaced with the protective film 114 and the adhesive layer 115, except that it is provided with the 2nd decorating layer 112b and the 2nd adhesive layer 113b of FIG. It is the same as the polarizing film 11 . The second decorating layer 112b is directly adhered to the peripheral portion of the main surface of the other side of the polarizer 111 without an adhesive layer interposed therebetween. The second adhesive layer 113b is formed so as to cover the main surface of the second decorative layer 112b opposite to the polarizer 111 and a region to which the second decorative layer 112b of the polarizer 111 is not adhered. .

Each of the first decorating layer 112a and the second decorating layer 112b has a water vapor transmission rate of 1500 g/m ² ·24h or less when the thickness is 25 µm. In this way, in the polarizing film 11, the first decorative layer 112a and the second decorative layer 112b of low moisture permeability are directly attached to each peripheral portion of each main surface of the polarizer 111 without an adhesive layer interposed therebetween. . Thereby, penetration of the water|moisture content into the polarizing film 11 from the side surface of the polarizing film 11 is reduced. Therefore, discoloration in the polarizer 111 can be reduced.

Example

Hereinafter, although this invention is demonstrated concretely based on an Example and a comparative example, this invention is not limited to the following example.

《Example 1》

(1) Preparation of samples for evaluation

The sample for evaluation of the laminated body containing the polarizing film 11 as shown in FIG. 3 was produced in the following procedure.

(a) Preparation of polarizer 111

As a base material made of a thermoplastic resin, an amorphous polyethylene terephthalate film (thickness 100 μm) containing 7 mol% of isophthalic acid units was prepared, and corona discharge treatment was performed on the ^{surface at an output discharge amount of 58 W/m 2 ·min.} .

Polyvinyl alcohol containing 1% by mass of acetoacetyl-modified polyvinyl alcohol (manufactured by Kosei Chemical Industry Co., Ltd., trade name: Gosei Reimer Z200 (average degree of polymerization 1200, saponification degree 98.5 mol%, acetoacetylation degree 5 mol%) Polymerization degree 4200, saponification degree 99.2%) was prepared, and the aqueous coating liquid containing 5.5 mass % of polyvinyl alcohol (PVA)-type resin was prepared.

The coating solution is applied to the surface of the substrate so that the film thickness after drying is 12 μm, and then dried for 10 minutes by hot air drying in an atmosphere of 60° C. to prepare a laminate in which a layer of PVA-based resin is provided on the substrate. did.

A stretched laminate was produced by first stretching the obtained laminate at a free end at 130°C in air at 1.8 times (air-assisted stretching). Next, the step of insolubilizing the PVA layer in which the PVA molecules contained in the stretched laminate were oriented by macerating the stretched laminate in an aqueous boric acid insolubilization solution having a liquid temperature of 30°C for 30 seconds was performed. The boric acid insolubilization aqueous solution of this process is boric acid aqueous solution whose boric acid content is 3 mass parts with respect to 100 mass parts of water. The colored laminate was produced by dyeing the obtained stretched laminate. The colored laminate is stretched by immersing the stretched laminate in a dye solution containing iodine and potassium iodide at a liquid temperature of 30° C. for a predetermined time so that the single transmittance of the PVA layer constituting the finally produced polarizer becomes 40 to 44%. The PVA layer contained in the laminate was dyed with iodine. In this step, the dyeing solution is an aqueous solution containing iodine and potassium iodide (iodine concentration: 0.1 to 0.4 mass%, potassium iodide concentration: 0.7 to 2.8 mass%, ratio of iodine to potassium iodide concentration: 1 to 7). Next, the process of crosslinking-processing the PVA molecules of the PVA layer to which iodine was adsorbed was performed by macerating a colored laminated body for 60 second in 30 degreeC boric-acid crosslinking aqueous solution. The boric acid crosslinking aqueous solution of this process is an aqueous solution (boric acid content: 3 mass parts with respect to 100 mass parts of water, potassium iodide content: 3 mass parts with respect to 100 mass parts of water) containing boric acid and potassium iodide.

By stretching the obtained colored laminate in a boric acid aqueous solution at a stretching temperature of 70° C. in the same direction as stretching in the air described above by 3.05 times (stretching in boric acid water), a laminate having a final draw ratio of 5.50 was obtained. The obtained layered product was taken out from the aqueous boric acid solution, and the boric acid adhering to the surface of the PVA layer was washed with an aqueous potassium iodide solution (potassium iodide content: 4 parts by mass with respect to 100 parts by mass of water). The wash|cleaned laminated body was dried by the drying process by 60 degreeC warm air. The thickness of the polarizer 111 included in the dried laminate was 5 μm.

(b) Preparation of the protective film 114

As the protective film 114, after shape|molding the methacryl resin pellet which has a glutarimide ring unit into a film shape by extrusion molding, the extended|stretched acrylic film was used. The thickness of the protective film 114 was 40 µm. The protective film 114 and the polarizer 111 of the laminate obtained in (a) were bonded together using an adhesive (active energy ray curing adhesive), and the adhesive was cured by irradiating ultraviolet rays under the following conditions. Next, by removing the base material, a laminate (polarizing film) of the protective film 114 and the polarizer 111 adhered via the adhesive layer 115 was produced.

Gallium-encapsulated metal halide lamps: Fusion UV Systems. Inc., brand name "Light HAMMER10"

Valve: V valve

Peak Illuminance: 1600 mW/cm ²

Integrated dose: 1000mJ/cm ² (wavelength 380-440 nm)

The water vapor transmission rate at the time of 25 micrometers in thickness of the protective film 114 calculated|required by the procedure mentioned above was 295 g/m<^2> *24h.

The adhesive was prepared by mixing the following components in the ratio in which content in 100 mass % of adhesive agents becomes the following value, and stirring at 50 degreeC for 1 hour.

Hydroxyethylacrylamide … 11.4% by mass

Tripropylene glycol diacrylate … 57.1% by mass

Acryloylmorpholine … 11.4% by mass

2-acetoacetoxyethyl methacrylate … 4.6% by mass

Acrylic polymer (ARUFON UP-1190, manufactured by Toagosei Co., Ltd.) ... 11.4% by mass

2-methyl-1-(4-methylthiophenyl)-2-morpholinopropan-1-one . 2.8% by mass

Diethylthioxanthone … 1.3% by mass

(c) Preparation of the retardation film 12

(c1) Preparation of the first retardation layer

Polymerization was carried out using a batch polymerization apparatus including two vertical reactors equipped with stirring blades and a reflux condenser controlled at 100°C. Bis[9-(2-phenoxycarbonylethyl)fluoren-9-yl]methane (BPFM) 29.60 parts by mass (0.046 mol), isosorbide (ISB) 29.21 parts by mass (0.200 mol), spiroglycol in a reactor (SPG) 42.28 parts by mass (0.139 mol), 63.77 parts by mass (0.298 mol) of diphenyl carbonate (DPC), and 1.19×10 ^-2 parts by mass (6.78×10 ^-5 mol) of calcium acetate monohydrate as a catalyst were introduced. .

After replacing the inside of the reactor with reduced pressure nitrogen, it was heated with a heating medium, and stirring was started when the temperature in the reactor reached 100°C. 40 minutes after the start of the temperature increase, the temperature in the reactor reached 220° C., and it was controlled to maintain this temperature. When the temperature in the reactor reached 220°C, the pressure reduction was started, and the pressure after 90 minutes was set to 13.3 kPa.

The phenol vapor produced by the polymerization reaction was guided to a reflux condenser at 100° C., the monomer component contained in a small amount in the phenol vapor was returned to the reactor, and the uncondensed phenol vapor was recovered by inducing it to a condenser at 45° C. After nitrogen was introduced into the first reactor and the pressure was returned to atmospheric pressure, the oligomerized reaction solution in the first reactor was transferred to the second reactor. Next, the temperature increase and pressure reduction in the 2nd reactor were started, and the temperature in the 1st reactor was 240 degreeC in 50 minutes, and the pressure was 0.2 kPa. Thereafter, polymerization was allowed to proceed until the stirring power reached a predetermined value. When the stirring power reached a predetermined value, nitrogen was introduced into the reactor and the pressure was restored, the resulting polyester carbonate was extruded into water, and the strands were cut to obtain pellets.

99.5 mass parts of the obtained polyester carbonate and 0.5 mass parts of polymethyl methacrylate (PMMA) were melt-kneaded using the extruder, and the pellet of the resin composition (PMMA content: 0.5 mass %) was obtained. After vacuum-drying this resin composition (pellet) at 80 degreeC for 5 hours, a single screw extruder (Isuzu Chemical Co., Ltd. make, screw diameter: 25 mm, cylinder set temperature: 220 degreeC), T-die (width: 300 mm, set temperature) : 220 ° C.), a cooling roll (set temperature: 120 to 130 ° C.), and using a film film forming apparatus equipped with a winder, a long unstretched film of 3 m in length, 200 mm in width, and 100 μm in thickness was produced. The obtained elongate unstretched film was stretched 2.7 times in the width direction (transverse direction) by a fixed-end uniaxial stretching method to prepare a first retardation layer having a thickness of 37 µm.

(c2) Preparation of laminated film containing second retardation layer

20 parts by mass of a side-chain liquid crystal polymer represented by the following formula (I) (numbers 65 and 35 in the formula represent mole % of monomer units and are conveniently represented as block polymers: weight average molecular weight 5000), representing a nematic liquid crystal phase 80 parts by mass of a polymerizable liquid crystal (manufactured by BASF, trade name PaliocolorLC242) and 5 parts by mass of a photopolymerization initiator (manufactured by Chiba Specialty Chemicals, trade name Irgacure 907) were dissolved in 200 parts by mass of cyclopentanone to prepare a liquid crystal coating solution.

The obtained liquid crystal coating solution was applied to a base film (Norbornene-based resin film: manufactured by Nippon Zeon Co., Ltd., trade name "Zeonex") using a bar coater, and then the liquid crystal was oriented by heating and drying at 80° C. for 4 minutes. . By irradiating an ultraviolet-ray to this liquid-crystal layer and hardening a liquid-crystal layer, the liquid-crystal solidified layer (thickness: 0.58 micrometer) used as a 2nd retardation layer was formed on the base film. This layer exhibited a refractive index characteristic of nz>nx=ny. Here, nx is the refractive index in the direction in which the in-plane refractive index of the liquid crystal solidified layer becomes maximum (that is, the slow axis direction). ny is the refractive index of the direction orthogonal to the slow axis in the plane of the liquid crystal solidified layer (that is, the fast axis direction). "nz" is the refractive index of the thickness direction of a liquid crystal solidified layer.

(c3) Preparation of a laminate of the first retardation layer and the second retardation layer

The liquid crystal solidified layer (2nd retardation layer) of laminated|multilayer film was affixed on one main surface of the 1st retardation layer via an acrylic adhesive. Then, the base film contained in the laminated|multilayer film was removed. In this way, the laminate in which the 1st retardation layer and the 2nd retardation layer corresponded to the liquid crystal solidified layer were laminated|stacked was produced.

(d) preparation of adhesive

In the following procedure, the acrylic adhesive (acrylic adhesive composition) was prepared.

(d1) Preparation of acrylic oligomer

60 parts by mass of dicyclofentanyl methacrylate and 40 parts by mass of methyl methacrylate as a monomer component, 3.5 parts by mass of α-thioglycerol as a chain transfer agent, and 100 parts by mass of toluene as a polymerization solvent are mixed, and 1 at 70° C. in a nitrogen atmosphere. time was stirred. Next, 0.2 mass parts of 2,2'-azobisisobutyronitrile was added as a thermal polymerization initiator, and after making it react at 70 degreeC for 2 hours, it heated up to 80 degreeC and made it react for 2 hours. Then, the reaction liquid was heated to 130 degreeC, toluene, a chain transfer agent, and an unreacted monomer were dried off, and the solid acrylic oligomer was obtained. The weight average molecular weight of the acrylic oligomer was 5100, and the glass transition temperature (Tg) was 130°C.

(d2) preparation of prepolymer composition

43 parts by mass of lauryl acrylate, 44 parts by mass of 2-ethylhexyl acrylate, 6 parts by mass of 4-hydroxybutyl acrylate, and 7 parts by mass of N-vinyl-2-pyrrolidone, and a photopolymerization initiator manufactured by BASF. A prepolymer composition (polymerization rate: about 10%) was obtained by mixing 0.015 parts by mass of Irgacure 184" and superposing|polymerizing by irradiating an ultraviolet-ray.

(d3) Preparation of acrylic pressure-sensitive adhesive

To 100 parts by mass of the prepolymer composition, 0.07 parts by mass of 1,6-hexanediol diacrylate, 1 part by mass of the acrylic oligomer and 0.3 parts by mass of a silane coupling agent (“KBM403J” manufactured by Shin-Etsu Chemical) are added and mixed uniformly. Thereby, the acrylic adhesive was prepared.

(e) Formation of the first edible layer 112a

On the main surface on the opposite side to the protective film 114 of the polarizer 111 of the polarizing film obtained in (b) above, as a first decorative layer 112a, a frame-like ink layer (width 15 mm, thickness 6) by screen printing μm) was prepared. The moisture permeability when the thickness of the first decorative layer 112a obtained in the above-described order was 25 μm was 1135 g/m ² ·24h.

The ink constituting the first edible layer 112a includes a soluble fluorescent pigment (manufactured by Imperial Ink Corporation, MIX-HF screen ink), a curing agent (manufactured by Imperial Ink Corporation, 210 curing agent), and a solvent (manufactured by Imperial Ink Corporation). Co., Ltd. make, C-002 solvent) was prepared by mixing. The concentrations of the soluble fluorescent pigment and the curing agent in the ink were 85% by mass and 3% by mass, respectively. In the ink, the soluble fluorescent pigment and the curing agent were uniformly dispersed. The ink was in a uniform state with no precipitation or aggregation observed even after being left overnight at 5°C.

(f) production of the optical film (10)

A laminate (retardation film 12) of the polarizing film in which the first decorative layer 112a is formed on the main surface of the polarizer 111 obtained in (e) and the retardation layer obtained in (c) (retardation film 12) obtained in (d) It was continuously bonded together by a roll-to-roll system using an acrylic adhesive. At this time, the retardation film 12 was bonded together so that a 1st retardation layer might be located at the polarizer side. The layers were laminated so that the axial angle between the slow axis and the absorption axis was 45°. In this way, the optical film 10 was produced. The thickness of the pressure-sensitive adhesive layer (the first pressure-sensitive adhesive layer 113a) composed of the acrylic pressure-sensitive adhesive was 25 µm. Water vapor transmission rate when the thickness 25㎛ the first adhesive layer (113a) which is obtained by the above-described procedure is 4678g / m ² · 24h was. Moreover, when the storage elastic modulus of the adhesive layer comprised by the acrylic adhesive was calculated|required in the above-mentioned order, it was 0.03 MPa.

(g) Pasting of glass plate S

The acrylic pressure-sensitive adhesive obtained in (d) is applied to the main surface (main surface of the second retardation layer side) opposite to the polarizer 111 of the retardation film 12 of the optical film 10 obtained in (f) above, and this pressure-sensitive adhesive Glass plate S (manufactured by Matsunami Glass Industries, S200423 MICRO SLIDE GLASS, thickness 1.2 mm) was bonded to the optical film 10 through the . In this way, the sample of the layer structure shown in FIG. 3 was produced.

(2) evaluation

The sample prepared in (1) above was maintained in a high-temperature and high-humidity environment (60° C.±1° C. and 90%±2% relative humidity) for 175 hours. Next, the following procedure evaluated the discoloration in the polarizer 111 in a sample.

The following conditions evaluated the discoloration of the polarizer 111 by Raman spectroscopy. More specifically, the sample is fixed so that the polarizer 111 can be analyzed from the protective film 114 side, and a region of 550 μm in length and 50 μm in width is focused inward from the cross section of the polarizer 111 . , mapping analysis was performed on the protective film 114 side (viewer side in the display device). The Raman spectrum was measured for a total of four points with a distance from the cross section of the polarizer 111 of 50 µm, 100 µm, 250 µm, and 500 µm.

Measuring device: SNOM/AFM/Raman multifunction device (alpha300RSA manufactured by WITec)

Excitation wavelength: 532 nm

Measurement wavelength range: 125 cm ^-1 to 3800 cm ^-1

Objective Lens: 10x

Measuring pitch: 2㎛

Detector: EMCCD

<Comparative Example 1>

In Example 1, the first decorative layer 112a was not formed on the main surface of the polarizer 111 , but was formed in a state of being adhered to the peripheral portion of the main surface of the retardation film 112 on the side of the first retardation layer. Other than that, it carried out similarly to the case of Example 1, produced the optical film 10, and evaluated the sample by affixing the glass plate S.

<Comparative Example 2>

In Example 1, as the protective film 114, a triacetyl cellulose film (thickness of 40 µm) was used instead of the acrylic film. Other than that, it carried out similarly to Example 1, produced the optical film 10, and evaluated the sample by affixing the glass plate S. In this case, the water vapor transmission rate at the time of 25 micrometers in thickness of the protective film 114 calculated|required by the above-mentioned procedure was 2151 g/m<^2> *24h.

The Raman spectra of Example 1 and Comparative Example 1 are shown in FIGS. 4 and 5, respectively. In each of these figures, the Raman spectrum at each measurement point was shown from the top to the bottom, and the distance of the measurement point was shown in order of closest from the cross section of the polarizer 111. In the Raman spectrum of a polarizer containing iodine Raman shift is in each position of the 106cm ^-1 and 156cm ^-1, I ₅ - and I ₃ - La manseon based on observed. As shown in FIG. 5 , in Comparative Example 1, at the innermost measurement point of the polarizer 111, even after exposing the sample to a high-temperature, high-humidity environment for a long time, Raman rays based on _{I 5} − and I _{3 − are observed,} At other measurement points, _{Raman rays based on I 5} − and I ₃ − are not observed. In contrast, in Example 1, as shown in FIG. 4, even after exposing the sample to a high-temperature, high-humidity environment for a long time, Raman rays based _{on I 5} − and I _{3 − were observed at all measurement points.} At the measurement point closest to the cross section, the _{intensity of the Raman rays based on I 5} − and I ₃ − is smaller than the intensity at the innermost measurement point, and slight discoloration is observed. However, compared to Comparative Example 1, it can be said that the discoloration in the polarizer 111 is significantly reduced.

Also, for Comparative Example 2, similar results to those of Comparative Example 1 were obtained.

While the present invention has been described in terms of presently preferred embodiments, such disclosure should not be construed as limiting. Various modifications and alterations will become apparent to those skilled in the art to which the present invention pertains upon reading the above disclosure. Accordingly, the appended claims should be construed to cover all modifications and variations without departing from the true spirit and scope of the present invention.

Industrial Applicability

The polarizing film or optical laminated body of this invention can be used for image display apparatuses, such as a flexible image display apparatus.

1, 101: flexible image display device
10: optical film
11: Polarizing film
111: polarizer
112a: first edible layer
112b: second edible layer
113a: first adhesive layer
113b: second adhesive layer
114: protective film
115: adhesive layer
12: retardation film
13: no window
131: window film
132: hard coat layer
14: touch sensor
15: panel member
22, 23: adhesive layer

Claims (10)

polarizer and
A first decorative layer and a first adhesive layer adhered to one main surface of the polarizer;
A second decorative layer and a second adhesive layer, or a protective film adhered to the main surface of the other side of the polarizer,
The first decorative layer is directly adhered to the periphery of the one main surface without interposing an adhesive layer,
The first adhesive layer is formed so as to cover a surface of the first decorative layer opposite to the polarizer and a region on the one main surface of the first decorative layer to which the first decorative layer is not adhered,
The second decorative layer is directly adhered to the periphery of the other main surface without interposing an adhesive layer,
The second adhesive layer is formed so as to cover a surface of the second decorative layer opposite to the polarizer and an area on the other main surface of the second decorative layer to which the second decorative layer is not adhered,
The protective film is directly adhered to the main surface of the other side without interposing an adhesive layer, or is adhered through an adhesive layer,
Each of the first decorative layer, the second decorative layer, and the protective film has a water vapor transmission rate of 1500 g/m ² ·24h or less when the thickness is 25 μm. According to claim 1,
After the polarizing film is maintained at 60° C.±1° C. and 90%±2% relative humidity for 175 hours for 175 hours, in the polarizer, the cross section of the polarizer and its vicinity do not include a bleached part, or a bleached part including,
When the polarizing film includes the decolorized portion, the decolored portion is formed in a region having a distance from the cross section of less than 100 μm. 3. The method of claim 1 or 2,
Each width of the first decorative layer and the second decorative layer is 0.1 mm or more, a polarizing film. 4. The method according to any one of claims 1 to 3,
The thickness of each of the first decorative layer and the second decorative layer is 5 μm or more, the polarizing film. 5. The method according to any one of claims 1 to 4,
Each of the first decorative layer and the second decorative layer includes an acrylic resin. 6. The method according to any one of claims 1 to 5,
The said protective film is a polarizing film containing at least 1 sort(s) chosen from the group which consists of an acrylic resin and a cyclic olefin resin. 7. The method according to any one of claims 1 to 6,
The thickness of the protective film is 40 μm or more, a polarizing film. A polarizing film according to any one of claims 1 to 7, and at least one of a window member and a retardation film,
The polarizing film has a first main surface on the viewer side and a second main surface opposite to the first main surface,
The window member is disposed on the first main surface side of the polarizing film,
The retardation film is disposed on the second main surface side of the polarizing film, the optical laminate. A polarizing film according to any one of claims 1 to 7 and a panel member are provided;
The polarizing film has a first main surface on the side of the viewer and a second main surface opposite to the first main surface,
The said panel member is arrange|positioned at the said 2nd main surface side. The image display apparatus provided with the optical laminated body of Claim 8, and the panel member arrange|positioned on the side opposite to the visual recognition side of the said optical laminated body.

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