KR20210079374A - Laminate and image display device - Google Patents

Abstract

The present invention relates to a bendable laminate comprising a front plate and a circularly polarizing plate having an adhesive layer on both sides, and even after a long period of time in a bent state in a high temperature and high humidity environment with the front plate side inside, in the bent portion, the front surface It aims at providing the laminated body excellent in visibility with small wrinkles which arise on the surface of a board|board side, and the image display apparatus provided with the same. The present invention is provided with a front plate and a circularly polarizing plate having a double-sided adhesive layer, the thickness of the front plate being a [μm], the thickness of the circular polarizing plate having a double-sided adhesive layer being b [μm], the front plate When the heat-and-moisture elastic modulus at a temperature of 60° C. and a relative humidity of 90% RH is c [MPa], a laminate satisfying [(b/a)×c] ≥ 2200 is provided.

Description

Laminate and image display device

The present invention relates to a laminate and an image display device including the same.

In patent document 1, in the image display apparatus which has an image display panel, an adhesive layer, and a flexible film in this order, it is proposed that an adhesive layer is spaced apart and arrange|positioned from an image display panel in a bending area|region.

Patent Document 1: Korean Patent Publication No. 10-2016-0069560

A laminate having a front plate and a circularly polarizing plate having pressure-sensitive adhesive layers on both surfaces thereof is placed in a bent state under a high-temperature, high-humidity environment, and then released from the bent state, in some cases, wrinkles may occur in the bent portion. These wrinkles may reduce the smoothness of the surface. When the smoothness of the surface decreases, for example, a reflected image is distorted and visibility is reduced. It is an object of the present invention, in a bendable laminate comprising a front plate and a circularly polarizing plate having an adhesive layer on both sides, with the front plate side inside and in a bent state under a high temperature and high humidity environment for a long time, even after being bent at the bent portion , to provide a laminate having small wrinkles on the surface of the front plate and excellent visibility, and an image display device including the same.

MEANS TO SOLVE THE PROBLEM This invention provides the following laminated body and an image display apparatus.

[1] A front plate and a circularly polarizing plate having a double-sided adhesive layer, wherein the thickness of the front plate is a [μm], the thickness of the circularly polarizing plate having the double-sided adhesive layer is b [μm], and A laminate that satisfies the following formula (1) when the tensile modulus of elasticity at a temperature of 60°C and a relative humidity of 90%RH of the front plate is c [MPa].

[(b/a)×c]≥2200 (1)

[2] The laminate according to [1], wherein the a and c satisfy the following formula (2).

a/c≤0.03 (2)

[3] The laminate according to [1] or [2], wherein the front plate has a hard coat layer.

[4] The laminate according to any one of [1] to [3], wherein the circularly polarizing plate having the double-sided adhesive layer has a first adhesive layer, a linear polarizing plate, a retardation layer, and a second adhesive layer in this order.

[5] The laminate according to [4], wherein the linearly polarizing plate includes a thermoplastic resin film having a hard coat layer on at least one surface thereof.

[6] An image display device comprising the laminate according to any one of [1] to [5].

According to the present invention, in a bendable laminate comprising a front plate and a circularly polarizing plate having an adhesive layer on both sides, even after a long period of time in a bent state in a high temperature and high humidity environment with the front plate side inside, in the bent portion, It is possible to provide a laminate having small wrinkles on the surface of the front plate and excellent visibility, and an image display device provided with the same.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic sectional drawing which shows the laminated body which concerns on one aspect of this invention.
It is a schematic sectional drawing which shows the laminated body which concerns on one aspect of this invention.

EMBODIMENT OF THE INVENTION Hereinafter, although embodiment of this invention is described, referring drawings, this invention is not limited to the following embodiment. In all the drawings below, scales are appropriately adjusted for easy understanding of each component, and the scale of each component shown in the drawings does not necessarily coincide with the scale of the actual component.

<Laminate>

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic sectional drawing of the laminated body by one Embodiment of this invention. The laminated body 100 shown in FIG. 1 is equipped with the front plate 10 and the circularly polarizing plate 20 which has a double-sided adhesive layer.

The laminate 100 can bend at least the front plate 10 inward in one direction. Being able to bend means that the front plate 10 can be bent in one direction without cracking.

The thickness of the front plate 10 is a [μm], the thickness of the circularly polarizing plate 20 having a double-sided pressure-sensitive adhesive layer is b [μm], and the tensile modulus of elasticity of the front plate 10 is at a temperature of 60 ° C. and a relative humidity of 90% RH. (Hereinafter, it abbreviate|omits and it may be called "tensile modulus".) When c [MPa], the laminated body 100 satisfy|fills following formula (1). In the present specification, unless otherwise specified, the tensile modulus refers to a value measured in an environment of a temperature of 60°C and a relative humidity of 90%RH.

[(b/a)×c]≥2200 (1)

Since the laminate 100 satisfies the formula (1), even after a long period of time in a bent state in a high temperature and high humidity environment with the front plate 10 turned inside out, in the bent portion, it occurs on the surface of the front plate 10 side. Wrinkles are suppressed and uniform visibility can be ensured. The front plate 10 and the circularly polarizing plate 20 having the double-sided adhesive layer are selected so as to satisfy the above formula (1). From the viewpoint of improving surface wrinkles, the laminate 100 preferably satisfies the following formula (1a), and more preferably satisfies the following formula (1b).

[(b/a)×c]≥3000 (1a)

[(b/a)×c]≥4000 (1b)

Moreover, it is preferable that the laminated body 100 satisfy|fills following formula (1c).

[(b/a)×c] ≤ 10000 (1c)

By the present inventor, a laminate comprising a front plate and a circularly polarizing plate having a double-sided pressure-sensitive adhesive layer is placed for a long time in a bent state in a high-temperature, high-humidity environment with the front plate inside, and then on the surface of the bent portion on the front plate side. It turned out that wrinkles generate|occur|produced and uniform visibility could not be ensured in some cases. As a result of the study, the thickness of the front plate, the thickness of the circular polarizing plate having the double-sided adhesive layer, and the tensile modulus of elasticity of the front plate were adjusted so that the laminate including the front plate and the circularly polarizing plate having the double-sided adhesive layer satisfies Equation (1) By doing this, it discovered that the said wrinkle could be suppressed.

In this specification, the tensile modulus of elasticity is measured according to the method described in the column of Examples to be described later.

As for the laminated body 100, Preferably a and c satisfy|fill the following formula (2) from a viewpoint of wrinkle suppression.

a/c≤0.03 (2)

The laminated body 100 more preferably satisfies the following formula (2a) from the viewpoint of suppressing wrinkles.

a/c≤0.02 (2a)

The laminated body 100 preferably satisfies the following formula (2b) from the viewpoint of suppressing wrinkles.

a/c≥0.009 (2b)

The shape of the laminate 100 in the plane direction may be, for example, a rectangular shape, preferably a rectangular shape having a long side and a short side, and more preferably a rectangle. When the shape of the laminate 100 in the plane direction is a rectangle, the length of the long side may be, for example, 10 mm or more and 1400 mm or less, and preferably 50 mm or more and 600 mm or less. The length of the short side is, for example, 5 mm or more and 800 mm or less, preferably 30 mm or more and 500 mm or less, and more preferably 50 mm or more and 300 mm or less. Each of the layers constituting the laminate 100 may be subjected to R processing at the corners, notches at the ends, or by punching.

The thickness of the laminate 100 is not particularly limited because it varies depending on the function required for the laminate and the use of the laminate, but is, for example, 20 µm or more and 500 µm or less, preferably 30 µm or more and 400 µm or less, More preferably, they are 50 micrometers or more and 300 micrometers or less.

The laminate 100 can be used, for example, in a display device or the like. The display device is not particularly limited, and examples thereof include an organic electroluminescent (organic EL) display device, an inorganic electroluminescent (inorganic EL) display device, a liquid crystal display device, and an electroluminescent display device. Since the wrinkle after bending is suppressed, the laminated body 100 is optimal for a flexible display.

[Front panel]

The front plate 10 may be a plate-like body capable of transmitting light. The front plate 10 may be comprised by only one layer, and may be comprised by two or more layers. Examples thereof include a resin plate-like body (eg, a resin plate, a resin sheet, a resin film, etc.), a glass-made plate-like body (eg, a glass plate, a glass film, etc.). The front plate may be a layer constituting the outermost surface of the display device.

The thickness a [μm] of the front plate 10 may be, for example, 10 μm or more and 100 μm or less, preferably 20 μm or more and 85 μm or less, from the viewpoint of suppressing wrinkles after bending and reducing the thickness of the laminate. Preferably, it is 30 micrometers or more and 70 micrometers or less. In the present invention, the thickness of each layer can be measured according to the thickness measurement method described in the column of Examples to be described later.

The tensile modulus c [MPa] of the front plate 10 at a temperature of 60°C and a relative humidity of 90% RH may be, for example, 1500 MPa or more, and from the viewpoint of suppressing wrinkles after bending, preferably 2000 MPa or more and 20000 MPa or less , More preferably, they are 2000 MPa or more and 10000 MPa or less. The tensile modulus of elasticity depends on, for example, selection of the material and thickness of the plate-like body constituting the front plate, the composition of the composition for forming a hard coat layer forming the hard coat layer described later, selection of the thickness of the cured product, and combinations thereof. may be adjusted within the above-mentioned range.

When the front plate 10 is a plate-shaped body made of resin, the plate-shaped body made of resin may be, for example, a resin film that can transmit light. Examples of the thermoplastic resin constituting the resin plate-shaped body such as a resin film include a chain polyolefin-based resin (polyethylene-based resin, polypropylene-based resin, polymethylpentene-based resin, etc.), a cyclic polyolefin-based resin (norbor polyolefin-based resins such as nene-based resins); Cellulose resins, such as a triacetyl cellulose; polyester-based resins such as polyethylene terephthalate, polyethylene naphthalate, and polybutylene terephthalate; polycarbonate-based resins; ethylene-vinyl acetate-based resin; polystyrene-based resin; polyamide-based resin; polyetherimide-based resins; (meth)acrylic resins, such as polymethyl (meth)acrylate resin; polyimide-based resin; polyether sulfone-based resin; polysulfone-based resin; polyvinyl chloride-based resin; polyvinylidene chloride-based resin; polyvinyl alcohol-based resin; polyvinyl acetal resin; polyether ketone-based resin; polyether ether ketone resin; polyether sulfone-based resin; Polyamideimide-type resin etc. are mentioned. A thermoplastic resin can be used individually or in mixture of 2 or more types.

Among them, the thermoplastic resin constituting the front plate is preferably a cyclic polyolefin-based resin, a polyimide-based resin, a polyamide-based resin, or a polyamideimide-based resin, more preferably from the viewpoint of flexibility, strength and transparency. is a polyamideimide-based resin. Specific examples of the polyamideimide-based resin include the polyamideimide film described in Japanese Patent Application Laid-Open No. 2018-119141.

The front plate 10 may be a film in which a hard coat layer is provided on at least one surface of the base film. As the base film, a film made of the above resin may be used. The hard-coat layer may be formed in one surface of a base film, and may be formed in both surfaces. By providing a hard-coat layer, it can be set as the resin film which improved hardness and scratch property.

A hard-coat layer can be formed from the hardened|cured material of the composition for hard-coat layer formation (henceforth, it is also mentioned the composition for HC layer formation) containing active-energy-ray-curable resin. Examples of the ultraviolet curable resin include an acrylic resin, a silicone resin, a polyester resin, a urethane resin, an amide resin, and an epoxy resin. The hard-coat layer may contain the additive in order to improve intensity|strength. The additive is not limited, and examples thereof include inorganic fine particles, organic fine particles, or mixtures thereof. The composition for HC layer formation can be prepared according to the method described in Korean Patent Laid-Open No. 10-2018-0127050 etc., for example.

When the front plate 10 is a glass plate, the tempered glass for a display is used preferably as a glass plate. By using the glass plate, the front plate 10 having excellent mechanical strength and surface hardness can be configured.

When the laminate 100 is used in a display device, the front plate 10 not only has a function (function as a window film) to protect the front surface (screen) of the display device, but is also detected by the touch sensor panel 30 . What may have a function as an operation surface which performs the touch used may also have a thing, and what has a blue light cut function, a viewing angle adjustment function, etc. may be sufficient.

[Circular polarizing plate having double-sided adhesive layer]

It is preferable that the circularly polarizing plate 20 which has a double-sided adhesive layer contains a 1st adhesive layer, a linear polarizing plate, retardation layer, and a 2nd adhesive layer in this order. In this embodiment, the thickness of the circularly polarizing plate 20 having a double-sided adhesive layer is from the surface on the opposite side to the linear polarizing plate side in the first adhesive layer to the surface on the opposite side to the linear polarizing plate side in the second adhesive layer can be the distance of The circular polarizing plate in which the linear polarizing layer and the retardation layer are arranged so that the absorption axis of the linear polarizing plate and the slow axis of the retardation layer are at a predetermined angle can exhibit an antireflection function. When the retardation layer includes the λ/4 plate, an angle between the absorption axis of the linear polarizing plate and the slow axis of the λ/4 plate may be 45°±10°. The linearly polarizing plate and the retardation layer may be bonded together by the bonding layer mentioned later. Hereinafter, a 1st adhesive layer and a 2nd adhesive layer may be generically called and also called an adhesive layer.

The thickness b of the circularly polarizing plate 20 which has a double-sided adhesive layer may be 10 micrometers or more and 200 micrometers or less, for example, Preferably they are 15 micrometers or more and 150 micrometers or less, More preferably, they are 20 micrometers or more and 100 micrometers or less.

(linear polarizer)

Examples of the linear polarizing plate include a film containing, as a polarizer, a stretched film or stretched layer to which a dichroic dye is adsorbed, or a film obtained by coating and curing a composition containing a dichroic dye and a polymerizable compound. Specifically, as the dichroic dye, iodine or a dichroic organic dye is used. The dichroic organic dye includes a dichroic direct dye composed of a disazo compound such as C. I. DIRECTRED 39, and a dichroic direct dye composed of a compound such as tris azo and tetrakis azo.

As a film obtained by coating and curing a composition containing a dichroic dye and a polymerizable compound used as a polarizer, a composition containing a dichroic dye having liquid crystallinity or a composition containing a dichroic dye and a polymerizable liquid crystal is applied and a film containing a cured product of a polymerizable liquid crystal compound such as a layer obtained by curing it. A film obtained by coating and curing a composition containing a dichroic dye and a polymerizable compound is preferable because there is no limitation in the bending direction compared to a stretched film or a stretched layer to which a dichroic dye is adsorbed.

A linear polarizing plate may be comprised only with a polarizer, and may further contain the protective layer mentioned later, a thermoplastic resin film, a base material, an orientation film, and a protective layer other than a polarizer. The thickness of the linear polarizing plate is, for example, 2 µm or more and 100 µm or less, and preferably 10 µm or more and 60 µm or less.

(1) A linear polarizing plate having a stretched film or a stretched layer as a polarizer

First, the linear polarizing plate provided with the stretched film which adsorbed the dichroic dye as a polarizer is demonstrated. A polarizer, a stretched film to which a dichroic dye is adsorbed, is usually a step of uniaxially stretching a polyvinyl alcohol-based resin film, a step of adsorbing the dichroic dye by dyeing the polyvinyl alcohol-based resin film with a dichroic dye, and a step of treating the polyvinyl alcohol-based resin film to which the dichroic dye is adsorbed with an aqueous boric acid solution, and a step of washing with water after treatment with an aqueous boric acid solution. Such a polarizer may be used as a linear polarizing plate as it is, and what bonded together the thermoplastic resin film mentioned later on the one side or both surfaces may be used as a linear polarizing plate. The thickness of the polarizer is preferably 2 µm or more and 40 µm or less.

Polyvinyl alcohol-type resin is obtained by saponifying polyvinyl acetate-type resin. As polyvinyl acetate-type resin, the copolymer of vinyl acetate and other monomer copolymerizable to this other than polyvinyl acetate which is a homopolymer of vinyl acetate is used. Examples of the other monomer copolymerizable with vinyl acetate include unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic acids, and (meth)acrylamides having an ammonium group.

The saponification degree of polyvinyl alcohol-type resin is 85-100 mol% normally, Preferably it is 98 mol% or more. The polyvinyl alcohol-type resin may be modified|denatured, for example, polyvinyl formal and polyvinyl acetal modified|denatured with aldehydes can also be used. The polymerization degree of polyvinyl alcohol-type resin is 1000 or more and 10000 or less normally, Preferably they are 1500 or more and 5000 or less.

Next, the linear polarizing plate provided with the stretched layer to which the dichroic dye was adsorbed as a polarizer is demonstrated. The stretched layer to which the dichroic dye, which is a polarizer, is adsorbed is usually a process of applying a coating liquid containing the polyvinyl alcohol-based resin on a base film, a process of uniaxially stretching the obtained laminated film, a uniaxially stretched laminated film By dyeing the polyvinyl alcohol-based resin layer with a dichroic dye, the dichroic dye is adsorbed to form a polarizer, the film to which the dichroic dye is adsorbed is treated with an aqueous boric acid solution, and washed with water after treatment with an aqueous boric acid solution It can be manufactured through a process.

You may peel and remove a base film from a polarizer as needed. The material and thickness of a base film may be the same as that of the thermoplastic resin film mentioned later and thickness.

The polarizer which is a stretched film or a stretched layer may be contained in the laminated body in the form by which the thermoplastic resin film is pasted together on the single side|surface or both surfaces. This thermoplastic resin film can function as a protective film for polarizers or retardation film. A thermoplastic resin film, For example, Polyolefin resins, such as chain|strand polyolefin resin (polypropylene resin etc.) and cyclic polyolefin resin (norbornene type resin etc.); Cellulose resins, such as a triacetyl cellulose; polyester-based resins such as polyethylene terephthalate, polyethylene naphthalate, and polybutylene terephthalate; polycarbonate-based resins; (meth)acrylic resin; Or it may be a film made of a mixture thereof.

The thickness of the thermoplastic resin film is usually 300 µm or less, preferably 200 µm or less, more preferably 100 µm or less, still more preferably 80 µm or less, and still more preferably 60 µm from the viewpoint of reducing the thickness of the thermoplastic resin film. or less, and is usually 5 µm or more, and preferably 20 µm or more. The thermoplastic resin film may or may not have retardation. A thermoplastic resin film can be bonded to a polarizer using an adhesive bond layer, for example.

(2) A linear polarizing plate comprising a film obtained by coating and curing a composition containing a dichroic dye and a polymerizable compound as a polarizer

A linear polarizing plate provided with a film obtained by coating and curing a composition containing a dichroic dye and a polymerizable compound as a polarizer will be described. A film obtained by coating and curing a composition containing a dichroic dye and a polymerizable compound used as a polarizer is prepared by applying a composition containing a dichroic dye having liquid crystallinity or a composition containing a dichroic dye and a liquid crystal compound to a substrate. The film obtained by apply|coating and hardening, etc. are mentioned. The film may be used as a linear polarizing plate by peeling off the substrate or together with the substrate, or may be used as a linear polarizing plate by having a thermoplastic resin film on one or both surfaces thereof.

The substrate may be a thermoplastic resin film. The example and thickness of a base material may be the same as what was illustrated by description of the above-mentioned thermoplastic resin film. The substrate may be a hard coat layer, an antireflection layer, or a thermoplastic resin film having an antistatic layer on at least one surface thereof. A hard-coat layer, an antireflection layer, an antistatic layer, etc. may be formed in the surface of a base material on the side where a polarizer is not formed. As for the base material, a hard coat layer, an antireflection layer, an antistatic layer, etc. may be formed only on the surface of the side where the polarizer is formed. The example of a hard-coat layer is the same as the example of the composition for HC layer formation in description of the above-mentioned front plate.

As a thermoplastic resin film, the thing similar to the linear polarizing plate provided with the said stretched film or a stretched layer as a polarizer is mentioned. A thermoplastic resin film can be bonded to a polarizer using an adhesive bond layer, for example.

It is preferable that the film which apply|coated and cured the composition containing a dichroic dye and a polymeric compound is thin, but when it is too thin, intensity|strength will fall and there exists a tendency for workability to be inferior. The thickness of the said film is 20 micrometers or less normally, Preferably they are 5 micrometers or less, More preferably, they are 0.5 micrometer or more and 3 micrometers or less.

As a film which apply|coated and hardened the composition containing a dichroic dye and a polymeric compound, the thing of Unexamined-Japanese-Patent No. 2013-37353, Unexamined-Japanese-Patent No. 2013-33249, etc. are mentioned specifically,.

(Orientation film)

The alignment layer may be disposed between the substrate and a layer of a cured product of a composition including a dichroic dye having liquid crystallinity or a composition including a dichroic dye and a liquid crystal compound. The alignment film has an alignment regulating force that aligns the liquid crystal layer formed thereon in a desired direction with a liquid crystal. Examples of the alignment film include an alignment polymer layer formed of an alignment polymer, a photo alignment polymer layer formed of a photo alignment polymer, and a groove alignment film having a concave-convex pattern or a plurality of grooves on the surface of the layer. The thickness of the alignment film may be, for example, 10 nm or more and 500 nm or less, and preferably 10 nm or more and 200 nm or less.

An orientation polymer layer can be formed by apply|coating the composition which melt|dissolved the orientation polymer in the solvent to a base material, removing a solvent, and rubbing process as needed. In this case, the orientation regulating force can be arbitrarily adjusted according to the surface state and rubbing conditions of the orientation polymer in the orientation polymer layer formed from the orientation polymer.

The photo-alignable polymer layer can be formed by applying a composition containing a polymer having a photoreactive group or a monomer and a solvent to a base layer and irradiating polarized light. In this case, the orientation regulating force can be arbitrarily adjusted according to the polarization|polarized-light irradiation conditions etc. with respect to a photo-alignment polymer in a photo-alignment polymer layer.

The groove alignment film is, for example, a method of forming a concave-convex pattern by performing exposure and development through an exposure mask having a pattern-shaped slit on the surface of the photoactive polyimide film, and an active energy ray on a plate-shaped disk having a groove on the surface. A method of forming an uncured layer of a curable resin and transferring this layer to a substrate for curing, forming an uncured layer of an active energy ray-curable resin on a substrate, and forming a roll-shaped disk having irregularities on this layer It can be formed by, for example, a method of forming and hardening irregularities by pressing or the like.

(protective layer)

A protective layer can be used in order to protect the surface of a polarizer. When the linear polarizing plate includes a thermoplastic resin film, the protective layer may be disposed on the opposite side to the thermoplastic resin film of the polarizer. As a protective layer, it may be formed from the resin film illustrated as a material of said thermoplastic resin film, and a coating-type protective layer may be sufficient. The coating-type protective layer may be formed by applying and curing a cation-curable composition such as an epoxy resin or a radical-curable composition such as (meth)acrylate, for example, an aqueous solution such as a polyvinyl alcohol-based resin is applied, , may be dried, and if necessary, a plasticizer, an ultraviolet absorber, an infrared absorber, a colorant such as a pigment or dye, a fluorescent whitening agent, a dispersing agent, a heat stabilizer, a light stabilizer, an antistatic agent, an antioxidant, a lubricant, etc. good.

The thickness of the protective layer may be, for example, 200 µm or less, and preferably 0.1 µm or more and 100 µm or less.

(retardation layer)

The retardation layer may include one or two or more retardation layers. The retardation layer may be a positive A layer such as a λ/4 layer or a λ/2 layer, and a positive C layer. The retardation layer may be formed of a resin film exemplified as a material for the above-mentioned thermoplastic resin film, or may be formed of a layer in which a polymerizable liquid crystal compound is cured. The retardation layer may further contain an orientation film and a base material. The thickness of the retardation layer may be, for example, 1 µm or more and 50 µm or less.

(Adhesive layer)

A 1st adhesive layer is an adhesive layer which the circularly polarizing plate 20 which has a double-sided adhesive layer has. A 1st adhesive layer is arrange|positioned in order to bond the circularly polarizing plate 20 and the front plate 10 which have a double-sided adhesive layer together. A 2nd adhesive layer is an adhesive layer which the circularly polarizing plate 20 which has a double-sided adhesive layer has. A 2nd adhesive layer is arrange|positioned in order to bond the circularly polarizing plate 20 which has a double-sided adhesive layer, and the back plate mentioned later. An adhesive layer can be formed using an adhesive composition. Although a single layer structure or a multilayer structure may be sufficient as an adhesive layer, Preferably it is a single layer structure. Each of the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer may be constituted by an adhesive layer of the same kind, or may be constituted by an adhesive layer of a different kind.

The pressure-sensitive adhesive composition may be a pressure-sensitive adhesive composition mainly containing a resin such as (meth)acrylic, rubber, urethane, ester, silicone, or polyvinyl ether. Especially, the adhesive composition which uses as a base polymer (meth)acrylic-type resin excellent in transparency, weather resistance, heat resistance, etc. is optimal. The pressure-sensitive adhesive composition may be an active energy ray curing type or a thermosetting type.

Examples of the (meth)acrylic resin (base polymer) used in the pressure-sensitive adhesive composition include butyl (meth)acrylate, methyl (meth)acrylate, ethyl (meth)acrylate, hexyl (meth)acrylate, octyl (meth)acrylate, ( One or two or more of (meth)acrylic acid esters such as lauryl meth)acrylate, isooctyl (meth)acrylate, isodecyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, and isobornyl (meth)acrylate Polymers or copolymers having as monomers are optimally used.

It is preferable to copolymerize a polar monomer with a base polymer. As the polar monomer, for example, (meth)acrylic acid, (meth)acrylic acid 2-hydroxypropyl, (meth)acrylic acid hydroxyethyl, (meth)acrylamide, N,N-dimethylaminoethyl (meth)acrylate and monomers having a carboxyl group, a hydroxyl group, an amide group, an amino group, an epoxy group, and the like, such as glycidyl (meth)acrylate.

Although the adhesive composition may contain only the said base polymer, normally, it further contains a crosslinking agent. As a crosslinking agent, it is a metal ion more than bivalence, and forms a carboxylate metal salt between a carboxyl group; it is a polyamine compound and forms an amide bond between a carboxyl group; What is a polyepoxy compound or a polyol, and forms an ester bond between a carboxyl group; It is a polyisocyanate compound, and what forms an amide bond between a carboxyl group is illustrated. Especially, a polyisocyanate compound is preferable.

The active energy ray-curable pressure-sensitive adhesive composition has a property of curing by irradiation with active energy rays such as ultraviolet rays or electron beams, has adhesiveness even before irradiation with active energy rays, and can adhere to an adherend such as a film, and is cured by irradiation with active energy rays It is a pressure-sensitive adhesive composition having a property that can adjust adhesive strength and the like.

The active energy ray-curable pressure-sensitive adhesive composition is preferably an ultraviolet curable type. The active energy ray-curable pressure-sensitive adhesive composition further contains an active energy ray-polymerizable compound in addition to the base polymer and the crosslinking agent. Moreover, you may make it contain a photoinitiator, a photosensitizer, etc. as needed.

As an active-energy-ray-polymerizable compound, For example, the (meth)acrylate monomer which has at least 1 piece(s) acryloyloxy group in a molecule|numerator; (meth)acrylic compounds such as (meth)acryloyloxy group-containing compounds such as (meth)acrylate oligomers obtained by reacting two or more functional group-containing compounds and having at least two (meth)acryloyloxy groups in the molecule can be heard

The pressure-sensitive adhesive composition includes fine particles for imparting light scattering properties, beads (resin beads, glass beads, etc.), glass fibers, resins other than the base polymer, tackifiers, fillers (metal powders or other inorganic powders, etc.), antioxidants, It may contain additives such as ultraviolet absorbers, antistatic agents, dyes, pigments, colorants, defoamers, corrosion inhibitors, and photopolymerization initiators.

The pressure-sensitive adhesive layer can be formed by applying, for example, an organic solvent diluent of the pressure-sensitive adhesive composition on a substrate and drying it. When an active energy ray hardening-type adhesive composition is used, it can be set as the hardened|cured material which has a desired degree of hardening by irradiating an active energy ray to the formed adhesive layer.

The thickness of the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer is, for example, 0.5 µm or more and 100 µm or less, preferably 0.7 µm or more and 50 µm or less, and more preferably 1 µm or more and 30 µm or less.

It is preferable that they are 0.01 MPa - 1.0 MPa, and, as for the storage elastic modulus in 25 degreeC of an adhesive layer, it is more preferable that they are 0.02 MPa - 0.1 MPa. The storage modulus is measured, for example, under the following conditions. A plurality of pressure-sensitive adhesive layers are laminated to a thickness of 0.6 mm. From the obtained pressure-sensitive adhesive layer, a cylindrical body (height 0.6 mm) having a diameter of 8 mm is pierced, and this is used as a sample for measurement of the storage elastic modulus. According to JISK7244-6, it can measure according to the torsional shearing method using a viscoelasticity measuring apparatus. The frequency can be 1 Hz.

[Other components]

As for the laminated body 100, the back plate may be bonded together through the 2nd adhesive layer. As a back plate, display elements, such as a touch sensor panel and an organic electroluminescent display element, or these combinations, etc. are mentioned.

2 : shows the schematic sectional drawing of the laminated body 200 which concerns on another aspect. The laminate 200 includes a front plate 10 and a circularly polarizing plate 20 having a double-sided pressure-sensitive adhesive layer. The circularly polarizing plate 20 having a double-sided adhesive layer includes the first adhesive layer 30, the linear polarizing plate 40, the bonding layer 50, the retardation layer 60, and the second adhesive layer 70 in this order. and the linear polarizing plate 40 has a base material 41, an alignment film 42, a polarizer 43, and a protective layer 44 in this order, and the retardation layer 60 is a λ/4 layer 61 , the bonding layer 62 , and the positive C layer 63 in this order.

(bonding layer)

The bonding layers 50 and 62 are an adhesive layer or an adhesive bond layer, and can be formed using an adhesive composition or an adhesive composition. Although the bonding layer may have a single layer structure or a multilayer structure, Preferably it is a single layer structure. As an adhesive composition, it may be the same as what was illustrated by description of the above-mentioned adhesive layer.

As the adhesive composition, a known adhesive composition may be used, and examples thereof include aqueous adhesive compositions such as polyvinyl alcohol-based resin aqueous solution and aqueous two-component urethane-based emulsion adhesive; The active energy ray-curable adhesive composition etc. which harden|cure by irradiating active energy rays, such as an ultraviolet-ray, are mentioned.

The thickness of the bonding layers 50 and 62 is 0.5 micrometer or more and 100 micrometers or less, for example, Preferably they are 0.7 micrometer or more and 50 micrometers or less, More preferably, they are 1 micrometer or more and 30 micrometers or less.

The laminated body 200 can be manufactured according to the method including the process of bonding together the layers which comprise a laminated body via an adhesive layer or an adhesive bond layer. When bonding layers together through an adhesive layer or an adhesive bond layer, in order to improve adhesiveness, it is preferable to perform surface activation treatment, such as a corona treatment, with respect to one or both of bonding surfaces, for example.

The polarizer 43 can be formed on the base material 41 with the alignment film 42 interposed therebetween. The polarizer 43 can be formed by apply|coating and hardening the composition for polarizer formation containing a dichroic dye and a polymerizable liquid crystal compound. The composition for forming a polarizer, in addition to the above-described dichroic dye and polymerizable liquid crystal compound, preferably further includes a polymerization initiator, a leveling agent, a solvent, and may further include a photosensitizer, a polymerization inhibitor, and the like.

The retardation layer 60 can be prepared by coating a composition for forming a retardation layer containing a polymerizable liquid crystal compound on a substrate and, if present, an alignment film, and polymerizing the polymerizable liquid crystal compound.

The composition for forming a retardation layer further includes a solvent and a polymerization initiator, and may further include a photosensitizer, a polymerization inhibitor, a leveling agent, and the like. The base material and the alignment film may be included in the retardation layer, or may not be separated from the retardation layer to become a component of the laminate.

Coating and drying of the composition for forming a polarizer and the composition for forming a retardation layer, and polymerization of the polymerizable liquid crystal compound can be performed according to a conventionally known coating method, drying method, and polymerization method.

The pressure-sensitive adhesive layers 30 and 70 can be prepared as pressure-sensitive adhesive sheets. The pressure-sensitive adhesive sheet is, for example, by dissolving or dispersing the pressure-sensitive adhesive composition in an organic solvent such as toluene or ethyl acetate to prepare a pressure-sensitive adhesive solution, and forming a layer consisting of the pressure-sensitive adhesive on the release film subjected to the release treatment in the form of a sheet, It can be produced by the method of bonding another peeling film together on the adhesive layer, etc. Each layer can be bonded together according to the method of bonding the adhesive sheet which peeled one peeling film to one layer, then peeling the other peeling film, and bonding the other layer together. The laminated body 200 may be manufactured by bonding the circularly polarizing plate and the front plate 10 in which the adhesive layer 30 and the adhesive layer 70 were formed, and the front plate 10 in which the adhesive layer 30 was formed, and the adhesive layer. It may be manufactured by bonding the circularly polarizing plate in which 70 was formed, and may be manufactured by bonding the front plate 10 in which the adhesive layer 30 was formed, and a circularly polarizing plate, and then forming the adhesive layer 70.

<Image display device>

It does not restrict|limit especially as an image display apparatus, For example, an organic electroluminescent (organic EL) display apparatus, an inorganic electroluminescent (inorganic EL) display apparatus, a liquid crystal display apparatus, a touch panel display apparatus, an electroluminescent display apparatus and the like. Since the image display apparatus of this embodiment has a bendable laminated body, it can utilize optimally for a flexible display, and can utilize it optimally especially for an organic electroluminescent display apparatus.

Example

Hereinafter, the present invention will be described in more detail by way of Examples. In Examples, "%" and "part" are mass % and parts by mass, unless otherwise specified.

[thickness of layer]

It measured using the contact type film thickness measuring apparatus ("MS-5C" manufactured by Nikon Corporation). However, the polarizer, the retardation layer, and the alignment film were measured using a laser microscope (LEXT, manufactured by Olympus Corporation).

[Method for measuring tensile modulus]

The tensile modulus of elasticity was measured using UTM (Universal Testing Machine, Autograph AG-X, Shimadzu Corporation) based on JISK7161. The stretching conditions were a speed of 4 mm/min, a width of 10 mm, and a gage distance of 50 mm in a moist and heat resistant environment (temperature of 60° C., 90% RH).

[Wrinkle evaluation]

The polyethylene terephthalate (PET) film was bonded to the laminated body obtained by each Example and the comparative example through the adhesive layer with which a laminated body was equipped, and the test piece was obtained. The PET film imitated an image display element, and the thickness was 100 micrometers. The test piece was laser-cut and subjected to a heat-and-moisture bending test under the following conditions, and then wrinkles in the bent portion were measured using an interference microscope. Wrinkles are installed in an interference microscope so that the front plate of the laminate is upward, and among the irregularities observed on the front plate side surface of the bent part of the laminate by the interference microscope, the average value of the difference in height between the highest and lowest positions (n = 6) ) was obtained as

(Moisture and heat bending test)

The laminate was left to stand for 10 days under an atmosphere of a temperature of 60°C and a relative humidity of 90%RH in a state in which the laminate was bent to a curvature radius of 1 mm (1R) with the front plate side inside.

[Visibility]

The laminated body after wrinkle evaluation was opened in the bent state, and it was made into the flat state. This laminate was installed under a fluorescent lamp so that the front plate side was upward, and the image of the fluorescent lamp reflected on the surface of the laminate was observed. The case where distortion was not visually recognized on the image of a fluorescent lamp was made into (circle) in the bent part, and the case where distortion was visually recognized on the image of a fluorescent lamp was made into x.

[Front panel 1]

(Polyamideimide Film)

In a nitrogen gas atmosphere, in a 1 L separable flask equipped with a stirring blade, 14.67 g (45.8 mmol) of 2,2'-bis(trifluoromethyl)benzidine (TFMB) and a water content of 200 ppm were prepared N,N- 233.3 g of dimethylacetoamide (DMAc) was added, and TFMB was dissolved in DMAc with stirring at room temperature. Then, 4.283 g (13.8 mmol) of 4,4'-oxydiphthalic dianhydride (OPDA) was added to the flask, followed by stirring at room temperature for 16.5 hours. Then, 1.359 g (4.61 mmol) of 4,4'-oxybis(benzoyl chloride) (OBBC) and 5.609 g (27.6 mmol) of terephthaloyl chloride (TPC) were added to the flask, followed by stirring at room temperature for 1 hour. Then, 4.937 g (48.35 mmol) of acetic anhydride and 1.501 g (16.12 mmol) of 4-picoline were added to the flask, and after stirring at room temperature for 30 minutes, the temperature was raised to 70° C. using an oil bath, followed by stirring for 3 hours to react got the liquid.

After cooling the obtained reaction liquid to room temperature, 360 g of methanol and 170 g of ion-exchanged water were added, and the polyamideimide precipitation was obtained. This was immersed in methanol for 12 hours, and it collect|recovered by filtration and wash|cleaned with methanol. Subsequently, the precipitate was dried under reduced pressure at 100°C to obtain a polyamideimide (PAI) resin having a thickness of 50 µm.

(Composition 1 for HC layer formation)

Composition 1 for HC layer formation contains 30 parts by mass of polyfunctional acrylate (Miramer M340, manufactured by Miwon Specialty Chemical), 50 parts by mass of propylene glycol monomethyl ether dispersion (12 nm, solid content 40%) of nano silica sol, 50 parts by mass, ethyl acetate 17 parts by mass, 2.7 parts by mass of a photoinitiator (Irgacure-184, manufactured by Ciba Corporation), and 0.3 parts by mass of a fluorine-based additive (KY1203, manufactured by Shin-Etsu Chemical Co., Ltd.) are included.

(Production of front panel 1)

The composition for forming the HC layer is coated on one side of the polyamideimide film, and the resulting coating film is dried at a temperature of 80° C. for 5 minutes, using a UV irradiation device (SPOT CURE SP-7, manufactured by USHIO INC.), An HC layer 1 was formed by irradiating UV light with an exposure dose of 500 mJ/cm 2 (based on 365 nm). It coated so that the thickness after hardening might be set to 10.0 micrometers. As described above, a front plate 1 having a structure of a polyamideimide film having an HC layer of 1/50 µm was obtained.

[Front panel 2]

In the preparation of the polyamideimide film of the front panel 1, instead of 4.283 g of OPDA, 6.140 g of 4,4'-(hexafluoroisopropylidene)diphthalic dianhydride (6 FDA) was used instead of 14.67 g (45.8 mmol) of TFMB. Except for using 8.809 g (27.5 mmol) of TFMB and 3.889 g (18.3 mmol) of 2,2'-dimethyl benzidine (MB), in the same manner as in the preparation of the polyamideimide film of Front Panel 1, polyamide having a thickness of 40 μm was Mid resin was obtained.

[Front panel 3]

A cycloolefin (COP) film (40 µm thick, manufactured by ZEON Corporation) was prepared.

[Front panel 4]

A triacetyl cellulose (TAC) film (thickness of 40 µm) was prepared.

[Preparation of the composition for polarizer formation]

(Polymerizable liquid crystal compound)

The polymerizable liquid crystal compound is a polymerizable liquid crystal compound represented by formula (1-6) [hereinafter also referred to as compound (1-6)] and a polymerizable liquid crystal compound represented by formula (1-7) [hereinafter referred to as compound (1-6)] 7) was also used.

[Tue 1]

[Tue 2]

Compound (1-6) and compound (1-7) are described in Lube et al. Recl. Trav. Chim. It was synthesized according to the method described by Pays-Bas, 115, 321-328 (1996).

(dichroic pigment)

As a dichroic dye, the azo dye described in the Example of Unexamined-Japanese-Patent No. 2013-101328 shown by following formula (2-1a), (2-1b), (2-3a) was used.

[Tue 3]

[Tuesday 4]

[Tue 5]

(Preparation of the composition for polarizer formation)

The composition for polarizer formation is 75 mass parts of compounds (1-6), 25 mass parts of compounds (1-7), and said formula (2-1a), (2-1b), (2-3a) as said dichroic dye 2.5 parts by mass of each of the azo dyes shown, 6 parts by mass of 2-dimethylamino-2-benzyl-1-(4-morpholinophenyl)butan-1-one (Irgacure369, manufactured by BASF Japan) as a polymerization initiator, and a leveling agent 1.2 mass parts of polyacrylate compounds (BYK-361N, BYK-Chemie company make) were mixed with 400 mass parts of toluene of a solvent, and it prepared by stirring the obtained mixture at 80 degreeC for 1 hour.

[Adhesive layer 1]

The adhesive composition which forms the adhesive layer 1 by the ratio of each component shown in following Table 1 was prepared. This adhesive composition was apply|coated so that the thickness after drying might be set to 25 micrometers using the applicator on the release-treated surface of the release-treated polyethylene terephthalate film (thickness 38 micrometers). The application layer was dried at 100 degreeC for 1 minute, and the film provided with the adhesive layer 1 was obtained. Then, on the adhesive layer 1, the other polyethylene terephthalate film (38 micrometers in thickness) by which the mold release process was carried out was pasted together. After that, it was cured for 7 days under conditions of a temperature of 23°C and a relative humidity of 50%RH.

The symbol in the column of the monomer in Table 1 shows the following meaning.

BA: butyl acrylate

MMA: methyl acrylate

EHA: Acrylic acid 2-ethylhexyl

AA: acrylic acid

The following crosslinking agents and silane coupling agents in Table 1 were used.

Crosslinking agent: Coronate L (manufactured by TOSOH CORPORATION)

Silane coupling agent: KBM-403 (manufactured by Shin-Etsu Chemical Co., Ltd.)

[Adhesive layer 2]

The film provided with the adhesive layer 2 was obtained like the adhesive layer 1 except having made the thickness after drying to be set to 5 micrometers.

[Adhesive layer 3]

The adhesive composition which forms the adhesive layer 3 by the ratio of each component shown in following Table 1 was prepared. This adhesive composition was apply|coated so that the thickness after drying might be set to 5 micrometers using the applicator on the release-treated surface of the release-treated polyethylene terephthalate film (thickness 38 micrometers).

The application layer was dried at 100 degreeC for 1 minute, and the film provided with the adhesive layer 3 was obtained. Then, on the adhesive layer, the other polyethylene terephthalate film (38 micrometers in thickness) by which the release process was carried out was pasted together. After that, it was cured for 7 days under conditions of a temperature of 23°C and a relative humidity of 50%RH.

[Reference 1]

A triacetyl cellulose (TAC) film (thickness of 25 µm) was prepared.

[Reference 2]

(Composition 2 for HC layer formation)

2.0 parts by mass of a dendrimer acrylate (Miramer SP1106, Miwon Specialty Chemical) having an 18-functional acryloyloxy group (sometimes referred to as an acryl group), a urethane acrylate (Miramer PU-620D, Miwon Specialty Chemical Co.) 10.0 parts by mass, acrylate monomer having a trifunctional acrylic group (M340, Miwon Specialty Chemical Co., Ltd.) 8 parts by mass, photopolymerization initiator (IRGACURE (registered trademark) 184, BASF Co., Ltd.) 2 parts by mass, and leveling (BYK-UV3530, byk-chemie japan kk) 0.1 mass parts was melt|dissolved in 70 mass parts of methyl ethyl ketone (MEK), it stirred and mixed, and the composition 2 for hard-coat layer formation was obtained.

(Production of base material 2)

The composition 2 for forming the HC layer was coated on one side of a cycloolefin (COP) film (thickness 13 μm), and the obtained coating film was dried at a temperature of 80° C. for 5 minutes, and a UV irradiation device (SPOT CURE SP-7, USHIO) INC.) was used, and UV light at an exposure dose of 500 mJ/cm 2 (based on 365 nm) was irradiated to form an HC layer 2 . It coated so that the thickness after hardening might be set to 2 micrometers. As described above, the base material 2 was obtained.

[λ/4F]

5 parts (weight average molecular weight: 30,000) of the photo-alignment material of the following structure and 95 parts of cyclopentanone were mixed, and the composition for horizontal alignment film formation was obtained by stirring the obtained mixture at 80 degreeC for 1 hour.

[Tue 6]

With respect to 100 parts of a mixture obtained by mixing the polymerizable liquid crystal compound A and the polymerizable liquid crystal compound B shown below in a mass ratio of 90:10, 1.0 part of a leveling agent (F-556; manufactured by DIC Corporation), and 2 which is a polymerization initiator -Dimethylamino-2-benzyl-1-(4-morpholinophenyl)butan-1-one ("IRGACURE 369 (Irg369)", manufactured by BASF Japan Co., Ltd.) was added in 6 parts.

Furthermore, N-methyl-2-pyrrolidone (NMP) was added so that solid content concentration might be 13 %, and the composition (1) for retardation layer formation was obtained by stirring at 80 degreeC for 1 hour.

The polymerizable liquid crystal compound A was prepared by the method described in Japanese Patent Laid-Open No. 2010-31223. In addition, the polymerizable liquid crystal compound B was manufactured according to the method described in Unexamined-Japanese-Patent No. 2009-173893. Each molecular structure is shown below.

(Polymerizable liquid crystal compound A)

[Tue 7]

(Polymerizable liquid crystal compound B)

[Tue 8]

A base film composed of a cycloolefin polymer (COP) film (manufactured by ZEON Corporation, ZF-14, thickness 23 µm) was subjected to a corona treatment apparatus (AGF-B10, manufactured by KASUGA DENKI, Inc.) at an output of 0.3 kW and a processing speed Corona treatment was performed once at a condition of 3 m/min. The composition for forming a horizontal alignment film was applied to the surface of the substrate subjected to corona treatment with a bar coater. The coating film was dried at 80° C. for 1 minute, and polarized UV exposure was performed using a polarized UV irradiation device (SPOT CURE SP-7; manufactured by USHIO INC.) at an accumulated light amount of 100 mJ/cm 2 . The thickness of the obtained horizontal alignment film was measured with a laser microscope (LEXT, manufactured by Olympus Corporation), and was 100 nm.

Subsequently, the composition (1) for forming a retardation layer was passed through a PTFE membrane filter having a pore diameter of 0.2 µm (manufactured by Advantec Toyo Kaisha, Ltd., part number; T300A025A) under an environment of room temperature 25° C. and humidity 30% RH, and 25° C. It was applied using a bar coater on a base film having an alignment film kept warm with a bar coater. After drying the coating film at 120° C. for 1 minute, using a high-pressure mercury lamp (Unicure VB-15201BY-A, manufactured by USHIO INC.), ultraviolet rays are irradiated (under nitrogen atmosphere, wavelength: 365 nm, accumulated light quantity at wavelength 365 nm) : 1000 mJ/cm 2 ) to create an optical film. The thickness of the obtained coating film was measured with a laser microscope (LEXT, manufactured by Olympus Corporation), and was 2 µm.

In this way, a laminate (retardation layer 1) in which a layer (λ/4 layer) in which the polymerizable liquid crystal compound was cured, a horizontal alignment film, and a base film were laminated in this order was obtained. The retardation layer 1 exhibited reverse wavelength dispersion.

[Positive C layer]

As a composition for forming a vertical alignment layer, 2-phenoxyethyl acrylate, tetrahydrofurfuryl acrylate, dipentaerythritol triacrylate, and bis(2-vinyloxyethyl) ether were mixed in a ratio of 1:1:4:5, , A mixture was used in which LUCIRIN TPO was added at a ratio of 4% as a polymerization initiator.

The composition (2) for forming a retardation layer was prepared by preparing a photopolymerizable nematic liquid crystal compound (manufactured by Merck, RMM28B) and a solvent so that the solid content was 1 to 1.5 g. As the solvent, a mixed solvent obtained by mixing methyl ethyl ketone (MEK), methyl isobutyl ketone (MIBK), and cyclohexanone (CHN) in a mass ratio (MEK:MIBK:CHN) of 35:30:35 is used. did.

A polyethylene terephthalate (PET) film having a thickness of 38 µm was prepared as a base film. A composition for forming a vertical alignment film was applied to one surface of the base film to a film thickness of 3 µm, and ultraviolet rays of 200 mJ/cm 2 were irradiated to prepare a vertical alignment film.

On the vertical alignment layer, the composition (2) for forming a retardation layer was coated by die coating.

The coating amount was 4 to 5 g (wet). The coating film was dried with a drying temperature of 75° C. and a drying time of 120 seconds. Thereafter, the coating film was irradiated with ultraviolet (UV) light to polymerize the polymerizable liquid crystal compound. The thickness of the obtained coating film was measured with a laser microscope (LEXT, manufactured by Olympus Corporation), and was found to be 1 µm.

In this way, a laminate (retardation layer 2) in which a layer in which a polymerizable liquid crystal compound was cured (positive C layer), a vertical alignment film, and a base film were laminated in this order was obtained. In the retardation layer 2, the total thickness of the layer in which the polymerizable liquid crystal compound was cured and the alignment film was 4 µm.

[Retardation layer]

The above-mentioned retardation layer 1 and retardation layer 2 are bonded together through the adhesive layer 3 so that the surface on the opposite side to the surface on the side of a base film may become a bonding surface, and base film/horizontal orientation film/(λ/4 layer)/adhesive layer A retardation layer having the configuration of 3/positive C layer/vertical alignment film/base film was obtained.

<Example 1>

First, the base material 1 was prepared. On the substrate 1, the composition for forming an alignment layer was applied according to a bar coater method. The coating film was dried at 80°C for 1 minute. Then, using the UV irradiation device and the wire grid, polarized UV was irradiated to the coating film, and the orientation ability was imparted to the coating film. The exposure dose was 100 mJ/cm 2 (based on 365 nm). The wire grid used UIS-27132## (manufactured by USHIO INC.). In this way, an alignment film was formed. The thickness of the alignment film was 100 nm.

On the formed alignment layer, the composition for forming a polarizer was applied according to a bar coater method. The coating film was dried by heating at 100°C for 2 minutes, and then cooled to room temperature. A polarizer was formed by irradiating the coating film with ultraviolet rays at a cumulative light amount of 1200 mJ/cm 2 (based on 365 nm) using the above UV irradiation device. The thickness of the obtained polarizer was 3 micrometers. On the polarizer, the composition containing polyvinyl alcohol and water was coated so that the thickness after drying might be set to 0.5 micrometer, and it dried at the temperature of 80 degreeC for 3 minutes, and formed the protective layer. In this way, a linear polarizing plate having the structure of the base material 1/alignment film/polarizer/protective layer was produced.

After corona-treating the surface of the adhesive layer 1 which peeled and exposed the polyethylene terephthalate film of one side of the film provided with the surface on the opposite side to the HC layer 1 of the front plate 1, and the adhesive layer 1, both were bonded together.

Then, after corona-treating the surface of the adhesive layer 1 which peeled and exposed the other polyethylene terephthalate film from the adhesive layer 1, and the surface by the side of the base material 1 of a linear polarizing plate, both were bonded together. Then, after corona-treating the surface of the adhesive layer 3 which peeled and exposed the one polyethylene terephthalate film of the film provided with the surface by the side of the protective layer of a linear polarizing plate, and the adhesive layer 3, both were bonded together. Next, the other polyethylene terephthalate film was peeled off from the adhesive layer 3, and the adhesive layer 3 was exposed. Thus, the laminated body which has the structure of front plate 1/adhesive layer 1/base material 1/orientation film/polarizer/protective layer/adhesive layer 3 was obtained.

The base film used for formation of the retardation layer 1 was peeled from the retardation layer mentioned above. The exposed λ/4 layer and the pressure-sensitive adhesive layer 3 were bonded together. The angle between the absorption axis of the polarizer and the slow axis of the λ/4 layer was 45°. Next, the base film used for formation of the retardation layer 2 was peeled, and the positive C layer was exposed. Then, the film provided with the other adhesive layer 1 was prepared, one polyethylene terephthalate film was peeled, and the surface of the adhesive layer 1 was exposed. After corona-treating the surface of the exposed positive C layer, and the surface of the adhesive layer 1, both were bonded together. Then, the other polyethylene terephthalate film was peeled off from the adhesive layer 1. In this way, the embodiment having the configuration of front plate 1 / adhesive layer 1 / base material 1 / alignment film / polarizer / protective layer / adhesive layer 3 / (λ / 4 layer) / adhesive layer 3 / positive C layer / adhesive layer 1 1 was obtained. A result is shown in Table 2. In Example 1, the circularly polarizing plate having a double-sided pressure-sensitive adhesive layer is adhesive layer 1 / base material 1 / orientation film / polarizer / protective layer / adhesive layer 3 / (λ / 4 layers) / adhesive layer 3 / positive C layer / pressure sensitive adhesive layer 1 is made of

<Example 2>

A laminate of Example 2 was obtained in the same manner as in Example 1 except that the front plate 2 was used instead of the front plate 1 in Example 1. A result is shown in Table 2.

<Example 3>

A laminate of Example 3 was obtained in the same manner as in Example 1 except that the front plate 3 was used instead of the front plate 1 in Example 1. A result is shown in Table 2.

<Example 4>

In Example 1, in place of preparing the base material 1 and applying the composition for forming an alignment film on the base 1, preparing the base 2, applying the composition for forming an alignment film on the HC layer 2 of the base 2, and an adhesive Except having used the film provided with the adhesive layer 2 instead of having used the film provided with the layer 1, it carried out similarly to Example 1, and obtained the laminated body of Example 4. A result is shown in Table 2.

<Comparative Example 1>

In Example 4, a laminate of Comparative Example 1 was produced in the same manner as in Example 4, except that the front plate 4 was used instead of the front plate 1. A result is shown in Table 2.

10 front panel,
20 A circularly polarizing plate having a double-sided adhesive layer,
30 first adhesive layer,
40 linear polarizer,
41 description,
42 alignment film,
43 polarizer,
44 protective layer,
50 laminated layers,
60 retardation layer,
61 λ/4 floor,
62 bonding layer;
63 positive C layer,
70 second adhesive layer,
100, 200 laminates.

Claims (6)

A front plate and a circularly polarizing plate having a double-sided adhesive layer, wherein the thickness of the front plate is a [μm], the thickness of the circularly polarizing plate having the double-sided adhesive layer is b [μm], and the thickness of the front plate is When the tensile modulus at a temperature of 60°C and a relative humidity of 90%RH is c [MPa], the following formula (1) is satisfied.
[(b/a)×c]≥2200 (1) According to claim 1,
Said a and said c satisfy|fill following formula (2), The laminated body.
a/c≤0.03 (2) 3. The method of claim 1 or 2,
wherein the front plate has a hard coat layer. 4. The method according to any one of claims 1 to 3,
The circularly polarizing plate having the double-sided pressure-sensitive adhesive layer is a laminate comprising a first pressure-sensitive adhesive layer, a linearly polarizing plate, a retardation layer, and a second pressure-sensitive adhesive layer in this order. 5. The method of claim 4,
The said linear polarizing plate is a laminated body containing the thermoplastic resin film which has a hard-coat layer on at least one surface. The image display apparatus provided with the laminated body in any one of Claims 1-5.

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