CN111487703A - Laminate for organic E L display and circularly polarizing plate used therein - Google Patents

Abstract

The present invention relates to a laminate for an organic EL display and a circular polarizing plate used therefor. An object of the present invention is to provide a laminate for an organic EL display including a circularly polarizing plate capable of protecting an organic EL panel even in a state in which no glass is present on the outermost surface, and also to provide a display An organic EL display device excellent in characteristics, flexibility, and deterioration over time, and a circular polarizing plate used therefor. The present invention provides a laminate for an organic EL display, which is a laminate in which a circularly polarizing plate and a pressure-sensitive adhesive layer are laminated, wherein the thickness of the laminate is 100 μm or less, the circularly polarizing plate includes a polarizing plate and a retardation plate, and a polarizing plate is provided. The plate includes a polarizer and a protective film, and has a protective film only on the opposite side of the polarizer to the surface on which the retardation plate is laminated, and the water vapor transmission rate of the circular polarizer is 100 g/m ² /24 hours or less, In addition, the transmittance at 380 nm of the circularly polarizing plate is 1% or less.

Description

Laminate for organic EL display and circular polarizing plate used therefor

technical field

The present invention relates to a laminate for an organic EL display, and particularly relates to a laminate for an organic EL display including a specific circular polarizing plate.

Background technique

In recent years, along with the spread of thin displays, displays (organic EL display devices) mounted with organic EL panels have become popular. In the organic EL panel, since external light is reflected at the internal metal electrodes, there is a problem that a clear black display cannot be obtained. In view of this problem, external light reflection can be suppressed and prevented by providing a circular polarizer on the viewing surface. That is, the lamination order from the viewer is cover glass→circular polarizing plate→organic EL panel. A circularly polarizing plate can usually be produced by laminating a polarizing plate and a retardation plate. As a polarizing plate, a polarizing plate obtained by laminating a transparent protective film on a polarizer obtained by stretching a polyvinyl alcohol (PVA) film and dyeing it with iodine is generally used. Among them, it is preferable to use a λ/4 plate that exhibits a property that the longer the wavelength is, the greater the birefringence property (inverse wavelength dispersion characteristic) is used. In addition, for the purpose of suppressing a change in reflected hue when viewed from an oblique direction, Patent Document 1 [JP 2015-163935 A] proposes a circularly polarizing plate further comprising a rod-shaped liquid crystal A vertical alignment liquid crystal cured film obtained by polymerizing and curing in a vertically aligned state.

prior art literature

Patent Literature

Patent Document 1: Japanese Patent Laid-Open No. 2015-163935

SUMMARY OF THE INVENTION

The problem to be solved by the invention

In the organic EL display device, application in a flexible form is studied, and glass is not used on the outermost surface of the device. However, it is known that when an organic EL panel is driven in a state where there is no barrier property to water (steam) and oxygen due to glass, deterioration may occur. In addition, it is known that the circular polarizer itself needs to be thinned in order to obtain good flexibility.

Therefore, an object of the present invention is to provide a laminate for an organic EL display including a circularly polarizing plate capable of protecting an organic EL panel even in a state where there is no glass on the outermost surface, and in addition, To provide an organic EL display device excellent in display characteristics, flexibility, and deterioration over time, and a circular polarizing plate used therefor.

means of solving problems

The present invention has the following modes:

[1] A laminate for an organic EL display, which is a laminate in which a circularly polarizing plate and an adhesive layer are laminated,

The thickness of the above-mentioned laminate is 100 μm or less,

The above-mentioned circular polarizing plate includes a polarizing plate and a retardation plate,

The polarizer includes a polarizer and a protective film, and has a protective film only on the opposite side of the polarizer to the surface on which the retardation plate is laminated,

The water vapor transmission rate of the above circularly polarizing plate is 100 g/m ² /24 hours or less, and

The transmittance at 380 nm of the circularly polarizing plate is 1% or less.

[2] The laminate for an organic EL display according to [1], wherein the polarizer is a polarizer formed of a polyvinyl alcohol-based resin film.

[3] The laminate for an organic EL display according to [1] or [2], wherein the circularly polarizing plate has a transmittance at 400 nm of 1% or less.

[4] The laminate for an organic EL display according to any one of [1] to [3], wherein the retardation plate includes only one retardation layer of a polymer containing a polymerizable liquid crystal compound, and the phase difference The difference plate satisfies all of the following formula (1), formula (2), and formula (3).

Re(450)/Re(550)≤1.00 (1)

1.00≤Re(650)/Re(550) (2)

100nm≤Re(550)≤180nm (3)

(In the formula, Re(λ) represents the in-plane retardation value with respect to light of wavelength λnm.)

[5] The laminate for an organic EL display according to [4], wherein the angle formed by the slow axis of the retardation plate and the absorption axis of the polarizing plate is substantially 45 degrees.

[6] The laminate for an organic EL display according to any one of [1] to [3], wherein the retardation plate includes a first retardation layer and a second retardation layer in this order from the polarizing plate side,

Each of the first retardation layer and the second retardation layer is a polymer of a polymerizable liquid crystal compound,

The first retardation layer satisfies the relationship of the following formula (4),

The second retardation layer satisfies the relationship of formula (3),

The retardation plate satisfies the relationship of formula (1) and formula (2).

Re(450)/Re(550)≤1.00 (1)

1.00≤Re(650)/Re(550) (2)

100nm≤Re(550)≤180nm (3)

200nm≤Re(550)≤300nm (4)

(In the formula, Re(λ) represents the in-plane retardation value with respect to light of wavelength λnm.)

[7] The laminate for an organic EL display according to any one of [1] to [6], further comprising an optical compensation plate made of a polymer of a polymerizable liquid crystal compound that satisfies the following formula (5).

-30nm≤Rth(550)≤-100nm (5)

(Rth(550) represents the in-plane retardation in the film thickness direction with respect to light having a wavelength of 550 nm.)

[8] The laminate for an organic EL display according to any one of [1] to [6], wherein the circularly polarizing plate includes an adhesive layer having a transmittance at 400 nm of 10% or less.

[9] The laminate for an organic EL display according to any one of [1] to [7], wherein the protective film is a cycloolefin film.

[10] The laminate for an organic EL display according to any one of [1] to [7], wherein the protective film is a polyimide film or a polyamideimide film.

[11] A circular polarizing plate, wherein at least a polarizing plate, an adhesive layer and a retardation plate are laminated in this order,

The above-mentioned polarizer includes a polarizer and a protective film, and has a protective film only on the opposite side of the polarizer to the surface on which the retardation plate is laminated,

The above retardation plate satisfies the relationship of formula (1) and formula (2),

The water vapor transmission rate of the above circularly polarizing plate is 100 g/m ² /24 hours or less, and

The transmittance at 380 nm of the circularly polarizing plate is 1% or less.

Re(450)/Re(550)≤1.00 (1)

1.00≤Re(650)/Re(550) (2)

[12] The circularly polarizing plate according to [11], wherein the polarizer is a polarizer formed of a polyvinyl alcohol-based resin film.

[13] The circularly polarizing plate according to [11] or [12], wherein the circularly polarizing plate has a transmittance at 400 nm of 1% or less.

[14] The circularly polarizing plate according to any one of [11] to [13], wherein the transmittance at 400 nm of the adhesive layer is 10% or less.

[15] The circularly polarizing plate according to any one of [11] to [14], wherein the protective film is a cycloolefin film.

[16] The circularly polarizing plate according to any one of [11] to [15], wherein the protective film is a polyimide film or a polyamideimide film.

effect of invention

The present invention can provide an organic EL display device and a circular polarizing plate used therefor that are excellent in display characteristics, flexibility, and deterioration over time even when the outermost surface of the organic EL display device has no glass.

Detailed ways

The laminate for an organic EL display of the present invention is a laminate in which a circular polarizer and a pressure-sensitive adhesive layer are laminated. The circular polarizer includes a polarizer and a retardation plate, and the polarizer includes a polarizer and a protective film. The polarizer has a protective film on the opposite side of the polarizer to the surface on which the retardation plate is stacked. The retardation plate can be a retardation plate composed of one retardation layer or a retardation plate composed of two retardation layers. In the case of two layers, it is sometimes referred to as the first retardation layer and the second retardation layer. differentiate. A polarizing plate and a retardation plate are usually joined by an adhesive layer to constitute a circular polarizing plate. The circularly polarizing plate may be combined with the pressure-sensitive adhesive layer to form the laminate for an organic EL display of the present invention, and an optical compensation plate may be further combined. Therefore, the laminate for an organic EL display of the present invention may be a laminate formed of a circularly polarizing plate and a pressure-sensitive adhesive layer, or may be a layered body formed by using another pressure-sensitive adhesive layer between the circularly polarizing plate and the pressure-sensitive adhesive layer. A laminate in which an optical compensation plate is bonded to a circularly polarizing plate.

<Polarizer>

The polarizing plate includes a film (hereinafter, sometimes referred to as a polarizer) having a function of light absorption anisotropy. The polarizer may be a stretched film to which a dichroic dye is adsorbed.

A polarizer that is a stretched film to which a dichroic dye is adsorbed is usually produced through the following steps: a step of uniaxially stretching a polyvinyl alcohol-based resin film; A step of dyeing an alcohol-based resin film to adsorb the dichroic dye; a step of treating the polyvinyl alcohol-based resin film to which the dichroic dye has been adsorbed with an aqueous boric acid solution; and a step of washing with water after the treatment with an aqueous boric acid solution .

The polyvinyl alcohol-based resin can be obtained by saponifying a polyvinyl acetate-based resin. As the polyvinyl acetate-based resin, in addition to polyvinyl acetate which is a homopolymer of vinyl acetate, copolymers of vinyl acetate and other monomers copolymerizable therewith can be used. Examples of other monomers copolymerizable with vinyl acetate include unsaturated carboxylic acid compounds, olefin compounds, vinyl ether compounds, unsaturated sulfonic acid compounds, acrylamide compounds having an ammonium group, and the like.

The degree of saponification of the polyvinyl alcohol-based resin is usually about 85 to 100 mol %, preferably 98 mol % or more. The polyvinyl alcohol-based resin may be modified, and for example, polyvinyl formal and polyvinyl acetal modified with aldehydes may also be used. The degree of polymerization of the polyvinyl alcohol-based resin is usually about 1,000 to 10,000, preferably in the range of 1,500 to 5,000.

A film made of such a polyvinyl alcohol-based resin can be used as a base film (Japanese: haramanibelumi) of a polarizing film. The method of making a polyvinyl alcohol-type resin into a film is not specifically limited, Film formation can be performed by a known method. The film thickness of the polyvinyl alcohol-based base film may be, for example, about 10 to 150 μm.

The uniaxial stretching of the polyvinyl alcohol-based resin film can be performed before, simultaneously with, or after dyeing with a dichroic dye. In the case of performing uniaxial stretching after dyeing, the uniaxial stretching may be performed before the boric acid treatment or during the boric acid treatment. In addition, uniaxial stretching may be performed in a plurality of stages among them. When performing uniaxial stretching, uniaxial stretching may be performed between rolls having different circumferential speeds, or uniaxial stretching may be performed using hot rolls. In addition, the uniaxial stretching may be dry stretching in which stretching is performed in the air, or wet stretching in which stretching is performed in a state where the polyvinyl alcohol-based resin film is swollen with a solvent. The draw ratio is usually about 3 to 8 times.

The dyeing by the dichroic dye of the polyvinyl alcohol-based resin film can be performed by, for example, a method of immersing the polyvinyl alcohol-based resin film in an aqueous solution containing the dichroic dye.

Specifically, as the dichroic dye, iodine and a dichroic organic dye can be used. As a dichroic organic dye, the dichroic direct dye which consists of a disazo compound, such as C.I. Direct Red 39, and the dichroic direct dye which consists of compounds, such as trisazo and tetrazo, etc. are mentioned. The polyvinyl alcohol-based resin film is preferably immersed in water before dyeing.

When iodine is used as a dichroic dye, a method of dipping a polyvinyl alcohol-based resin film in an aqueous solution containing iodine and potassium iodide and dyeing is usually employed.

The content of iodine in the aqueous solution is usually about 0.01 to 1 part by mass with respect to 100 parts by mass of water. Moreover, content of potassium iodide is about 0.5-20 mass parts normally with respect to 100 mass parts of water. The temperature of the aqueous solution used for dyeing is usually about 20 to 40°C. Moreover, the immersion time (dyeing time) immersed in this aqueous solution is about 20-1,800 second normally.

On the other hand, when a dichroic organic dye is used as a dichroic dye, a method of dipping a polyvinyl alcohol-based resin film in an aqueous solution containing a water-soluble dichroic dye and dyeing is usually employed.

The content of the dichroic organic dye in the aqueous solution is usually about 1 × 10 ^-4 to 10 parts by mass, preferably 1 × 10 ^-3 to 1 part by mass, more preferably 1 × 10 with respect to 100 parts by mass of water. ^-3 to 1×10 ^-2 parts by mass. The aqueous solution may contain inorganic salts such as sodium sulfate as dyeing aids. The temperature of the dichroic dye aqueous solution used for dyeing is usually about 20 to 80°C. Moreover, the immersion time (dyeing time) immersed in this aqueous solution is about 10-1,800 second normally.

The boric acid treatment after dyeing with a dichroic dye can usually be performed by a method of immersing the dyed polyvinyl alcohol-based resin film in a boric acid aqueous solution. The content of boric acid in the boric acid aqueous solution is usually about 2 to 15 parts by mass, preferably 5 to 12 parts by mass, with respect to 100 parts by mass of water. When iodine is used as a dichroic dye, the boric acid aqueous solution preferably contains potassium iodide, and the content of potassium iodide in this case is usually about 0.1 to 15 parts by mass, preferably 5 to 12 parts by mass, relative to 100 parts by mass of water. The immersion time for immersion in the boric acid aqueous solution is usually about 60 to 1,200 seconds, preferably 150 to 600 seconds, and more preferably 200 to 400 seconds. The temperature of the boric acid treatment is usually 50°C or higher, preferably 50 to 85°C, and more preferably 60 to 80°C.

Usually, the polyvinyl alcohol-based resin film after boric acid treatment can be subjected to water washing treatment. The water washing treatment can be performed, for example, by a method of immersing the boric acid-treated polyvinyl alcohol-based resin film in water. The temperature of the water in the water washing treatment is usually about 5 to 40°C. In addition, the immersion time is usually about 1 to 120 seconds.

A polarizer can be obtained by performing drying treatment after washing with water. The drying process can be performed using, for example, a hot air dryer or a far-infrared heater. The temperature of the drying treatment is usually about 30 to 100°C, preferably 50 to 80°C. The drying time is usually about 60 to 600 seconds, preferably 120 to 600 seconds. By drying, the moisture content of the polarizer can be reduced to a practical level. The moisture content is usually about 5 to 20% by weight, preferably 8 to 15% by weight. When the moisture content is less than 5% by weight, the flexibility of the polarizer is lost, and the polarizer may be damaged or broken after drying. In addition, when the moisture content is higher than 20% by weight, the thermal stability of the polarizer may be deteriorated.

The thickness of the polarizer obtained by subjecting the polyvinyl alcohol-based resin film to uniaxial stretching, dyeing with a dichroic dye, boric acid treatment, water washing, and drying as described above is preferably 5 to 40 μm, more preferably 5 to 20 μm.

The polarizing plate of this invention is obtained by laminating|stacking a protective film only on one surface of the polarizing plate obtained by the said method etc. via an adhesive bond layer. The protective film is laminated on the opposite side of the polarizer to the surface on which the retardation plate is laminated. The adhesive layer is formed using a known adhesive composition.

<Protective film>

The protective film refers to a base material having transparency through which light (especially visible light) can be transmitted. Transparency refers to a characteristic of transmittance of 80% or more with respect to light in a wavelength range of 380 to 780 nm. Specific protective films include: polyolefins such as polyethylene and polypropylene; cycloolefin-based resins such as norbornene-based polymers; polyvinyl alcohol; polyethylene terephthalate; polymethacrylates ; polyacrylate; cellulose esters such as triacetyl cellulose, diacetyl cellulose, cellulose acetate propionate; polyethylene naphthalate; polycarbonate; polysulfone; polyether sulfone; polyether ketone; poly Phenyl sulfide and polyphenylene ether, etc. From the viewpoints of availability and transparency, polyethylene terephthalate, polymethacrylate, cellulose ester, cycloolefin-based resin, or polycarbonate are preferable. Cellulose ester is obtained by esterifying a part or all of the hydroxyl groups contained in cellulose, and can be easily obtained from the market. Cellulose ester substrates are also readily commercially available.

As a commercially available cellulose ester base material, "FUJITAC film" (Fuji Photo Film Co., Ltd.), "KC8UX2M", "KC8UY", and "KC4UY" (Konica Minolto Opto Co., Ltd.) etc. are mentioned.

The properties required for the protective film vary depending on the configuration of the polarizing plate, but generally, a film with as little retardation as possible is preferable. As a film with as little retardation as possible, the cellulose ester film etc. which do not have retardation, such as ZeroTAC (Konica Minolto Opto Co., Ltd.) and Z-TAC (Fuji Film Co., Ltd.), are mentioned. In addition, an unstretched cyclic olefin-based resin film is also preferable. A polyimide film, a polyamideimide film, etc. are also mentioned as another preferable protective film. The surface of the protective film on which the polarizing plate is not laminated may be subjected to hard coating treatment, antireflection treatment, antistatic treatment, or the like.

In the present invention, the resin forming the protective film may be, for example, a cycloolefin, a polyamide having an amide bond in the molecule, a gelatin compound, a polyimide having an imide bond in the molecule, and a polyamic acid which is a hydrolyzate thereof. , polyvinyl alcohol, alkyl-modified polyvinyl alcohol, polyacrylamide, polyoxazole, polyethyleneimine, polystyrene, polyvinylpyrrolidone, polyacrylic acid and polyacrylate. The transmittance at 400 nm of the protective film is preferably 10% or less. When the transmittance at 400 nm is 10% or less, there is an effect of suppressing deterioration (discoloration) of the organic EL panel.

The thickness of the protective film is usually 10 to 80 μm, preferably 20 to 60 μm, and more preferably 20 to 40 μm, from the viewpoint of improving strength and workability.

<Phase plate>

The retardation plate may be a stretched film that provides a retardation by stretching a polymer, but from the viewpoint of thinning the laminate for an organic EL display of the present invention, it is preferably composed of a polymerizable film having a horizontal orientation or a vertical orientation. A retardation layer composed of a polymer of a liquid crystal compound. When a retardation plate consists of a retardation layer, only a retardation layer may be sufficient as it, and an alignment film and a base material mentioned later may be included.

When the retardation plate includes only one retardation layer containing a polymer of a polymerizable liquid crystal compound, it is preferable to satisfy all of the following formulae (1), (2) and (3):

Re(450)/Re(550)≤1.00 (1)

1.00≤Re(650)/Re(550) (2)

100nm≤Re(550)≤180nm (3)

(In the formula, Re(λ) represents the in-plane retardation value with respect to light of wavelength λnm.)

The retardation plate satisfying the above formula (1) has so-called reverse wavelength dispersion, and exhibits excellent polarization performance. The value of Re(450)/Re(550) is preferably 0.93 or less, more preferably 0.88 or less, still more preferably 0.86 or less, preferably 0.80 or more, and more preferably 0.82 or more. The above formula (3) is preferably 100 nm≦Re(550)≦180 nm, and more preferably 120 nm≦Re(550)≦160 nm.

In addition, Re(550) can be measured by the method described in an Example.

In the circular polarizing plate of the present invention, the angle formed by the slow axis of the retardation plate and the absorption axis of the polarizing plate is preferably substantially 45°. In addition, in the present invention, "substantially 45°" means 45°±5°.

When the retardation plate includes a first retardation layer and a second retardation layer, and each retardation layer is a retardation layer of a polymer which is a polymerizable liquid crystal compound, it is preferable that the first retardation layer satisfies the following The relationship of the formula (4), the second retardation layer satisfies the relationship of the formula (3), and the retardation plate as a whole satisfies the relationship of the formulas (1) and (2).

200nm≤Re(550)≤300nm (4)

(In the formula, Re(λ) represents the in-plane retardation value with respect to light of wavelength λnm.)

The polymerizable liquid crystal compound forming the retardation layer (hereinafter, also referred to as "polymerizable liquid crystal compound (A)") refers to a liquid crystal compound having a polymerizable functional group, especially a photopolymerizable functional group. The photopolymerizable functional group refers to a group that can participate in a polymerization reaction by utilizing an active radical, an acid, or the like generated by a photopolymerization initiator. Examples of the photopolymerizable functional group include vinyl group, vinyloxy group, 1-chlorovinyl group, isopropenyl group, 4-vinylphenyl group, acryloyloxy group, methacryloyloxy group, and epoxyethyl group. , oxetanyl, etc. Among them, an acryloyloxy group, a methacryloyloxy group, a vinyloxy group, an oxiranyl group, and an oxetanyl group are preferable, and an acryloyloxy group is more preferable. The liquid crystallinity may be a thermotropic liquid crystal or a lyotropic liquid crystal, and the phase order structure may be a nematic liquid crystal or a smectic liquid crystal. As the polymerizable liquid crystal compound, only one type may be used, or two or more types may be used in combination.

Examples of the polymerizable liquid crystal compound (A) include compounds satisfying all of the following (I) to (IV) from the viewpoints of ease of film formation and retardation.

(I) is a compound with thermotropic liquid crystallinity;

(II) It has π electrons in the long axis direction (a) of the polymerizable liquid crystal compound.

(III) It has π electrons in a direction intersecting with the major axis direction (a) [intersection direction (b)].

(IV) D(πa) and D(πb) are in the relationship of 0≤[D(πa)/D(πb)]≤1,

[That is, the π electron density in the cross direction (b) is larger than the π electron density in the major axis direction (a)]

The above D(πa) is calculated as follows when the sum of the π electrons existing in the long axis direction (a) is N(πa) and the sum of the molecular weights existing in the long axis direction (a) is N(Aa). The π electron density in the long axis direction (a) of the polymerizable liquid crystal compound defined by the formula (i):

D(πa)=N(πa)/N(Aa)(i),

The above D(πb) is represented by the following formula when the sum of the π electrons existing in the intersecting direction (b) is N(πb) and the sum of the molecular weights existing in the intersecting direction (b) is N(Ab). (ii) The π electron density in the cross direction (b) of the polymerizable liquid crystal compound defined by:

D(πb)=N(πb)/N(Ab) (ii).

In addition, the polymerizable liquid crystal compound (A) satisfying all of the above (I) to (IV) can be applied to an alignment film formed by a rubbing treatment and heated to a phase transition temperature or higher. A nematic phase is formed. The nematic phase formed by aligning the polymerizable liquid crystal compound (A) is usually oriented so that the long axis directions of the polymerizable liquid crystal compound become parallel to each other, and the long axis direction becomes the orientation of the nematic phase. direction.

The polymerizable liquid crystal compound (A) having the above-mentioned properties usually exhibits reverse wavelength dispersion. Specific examples of the compounds satisfying the above-mentioned properties (I) to (IV) include compounds represented by the following formula (I),

The compounds represented by the above formula (I) may be used alone or in combination of two or more.

In formula (I), Ar represents a divalent aromatic group which may have a substituent. The aromatic group herein refers to a group having a planar cyclic structure, and the number of π electrons in the cyclic structure is [4n+2 according to Huckel's rule] ]indivual. Here, n represents an integer. When a ring structure is formed by including heteroatoms such as -N= and -S-, it also includes a case where the non-covalent electron pair on these heteroatoms satisfies the Huckel's rule and is aromatic. The divalent aromatic group preferably contains at least one of a nitrogen atom, an oxygen atom, and a sulfur atom.

G ¹ and G ² each independently represent a divalent aromatic group or a divalent alicyclic hydrocarbon group. Here, the hydrogen atom contained in the divalent aromatic group or the divalent alicyclic hydrocarbon group may be replaced by a halogen atom, an alkyl group having 1 to 4 carbon atoms, a fluoroalkyl group having 1 to 4 carbon atoms, Substituted with an alkoxy group, cyano group or nitro group having 1 to 4 carbon atoms, and the carbon atoms constituting the divalent aromatic group or the divalent alicyclic hydrocarbon group may be substituted with an oxygen atom, a sulfur atom or a nitrogen atom .

L ¹ and L ² are each independently a divalent linking group having an ester structure.

B ¹ and B ² are each independently a single bond or a divalent linking group.

k and 1 each independently represent an integer of 0 to 3, and satisfy the relationship of 1≦k+1. Here, in the case of 2≦k+1, B ¹ and B ² , and G ¹ and G ² may be the same or different from each other.

E ¹ and E ² each independently represent an alkanediyl group having 1 to 17 carbon atoms. Here, the hydrogen atom contained in the alkanediyl group may be substituted with a halogen atom, and -CH ₂ contained in the alkanediyl group may be substituted. -Can be replaced with -O-, -S-, -Si-, -COO-. P ¹ and P ² independently represent a polymerizable group or a hydrogen atom, and at least one of them is a polymerizable group.

G ¹ and G ² are each independently preferably 1,4-phenylenediyl which may be substituted with at least one substituent selected from the group consisting of a halogen atom and an alkyl group having 1 to 4 carbon atoms. 1,4-cyclohexanediyl substituted with at least one substituent selected from the group consisting of a halogen atom and an alkyl group having 1 to 4 carbon atoms, more preferably 1,4-cyclohexanediyl substituted with a methyl group Phenyl, unsubstituted 1,4-phenylene, or unsubstituted 1,4-trans-cyclohexanediyl, especially preferably unsubstituted 1,4-phenylene, or unsubstituted 1 , 4-trans-cyclohexanediyl. In addition, it is preferable that at least one of G ¹ and G ² present in plural is a divalent alicyclic hydrocarbon group, and it is more preferable that G ¹ and G bonded to L ¹ or L ² At least one of ² is a divalent alicyclic hydrocarbon group.

L ¹ and L ² are each independently preferably -R ^a1 COOR ^a2 - (R ^a1 and R ^a2 each independently represent a single bond or an alkylene group having 1 to 4 carbon atoms), more preferably -COOR ^a2-1 - (R ^a2-1 represents any one of a single bond, -CH ₂ -, and -CH ₂ CH ₂ -), more preferably -COO- or -COOCH ₂ CH ₂ -.

B ¹ and B ² are each independently preferably a single bond, an alkylene group having 1 to 4 carbon atoms, -O-, -S-, -R ^a9 OR ^a10 -, -R ^a11 COOR ^a12 -, -R ^a13 OCOR ^a14 -, or -R ^a15 OC=OOR ^a16 -. Here, R ^a9 to R ^a16 each independently represent a single bond or an alkylene group having 1 to 4 carbon atoms. B ¹ and B ² are each independently more preferably a single bond, -OR ^a10-1 -, -CH ₂ -, -CH ₂ CH ₂ -, -COOR ^{a12 -1} -, or -OCOR ^a14-1 -. Here, R ^a10-1 , R ^a12-1 , and R ^a14-1 each independently represent any one of a single bond, -CH ₂ -, and -CH ₂ CH ₂ -. B ¹ and B ² are each independently more preferably a single bond, -O-, -CH ₂ CH ₂ -, -COO-, -COOCH ₂ CH ₂ -, -OCO-, or -OCOCH ₂ CH ₂ -.

From the viewpoint of exhibiting inverse wavelength dispersion, k and l are preferably in the range of 2≤k+l≤6, preferably k+l=4, and more preferably k=2 and l=2. When k=2 and l=2, since a symmetrical structure is obtained, it is more preferable.

E ¹ and E ² are each independently preferably an alkanediyl group having 1 to 17 carbon atoms, and more preferably an alkanediyl group having 4 to 12 carbon atoms.

Examples of the polymerizable group represented by P ¹ or P ² include epoxy group, vinyl group, vinyloxy group, 1-chlorovinyl group, isopropenyl group, 4-vinylphenyl group, and acryloyloxy group. , methacryloyloxy, oxirane, and oxetanyl. Among these, an acryloyloxy group, a methacryloyloxy group, a vinyloxy group, an oxiranyl group, and an oxetanyl group are preferable, and an acryloyloxy group is more preferable.

Ar preferably has at least one selected from the group consisting of an optionally substituted aromatic hydrocarbon ring, an optionally substituted aromatic heterocyclic ring, and an electron withdrawing group. As this aromatic hydrocarbon ring, a benzene ring, a naphthalene ring, an anthracene ring, etc. are mentioned, A benzene ring and a naphthalene ring are preferable. Examples of the aromatic heterocyclic ring include a furan ring, a benzofuran ring, a pyrrole ring, an indole ring, a thiophene ring, a benzothiophene ring, a pyridine ring, a pyrazine ring, a pyrimidine ring, a triazole ring, and a triazine ring. , pyrroline ring, imidazole ring, pyrazole ring, thiazole ring, benzothiazole ring, thienothiazole ring, oxazole ring, benzoxazole ring, and phenanthroline ring, etc. Among these, it is preferable to have a thiazole ring, a benzothiazole ring, or a benzofuran ring, and it is more preferable to have a benzothiazole ring. In addition, when a nitrogen atom is included in Ar, the nitrogen atom preferably has π electrons.

In formula (I), the total number N _π of π electrons contained in the divalent aromatic group represented by Ar is preferably 8 or more, more preferably 10 or more, still more preferably 14 or more, and particularly preferably 16 or more. Moreover, 30 or less are preferable, 26 or less are more preferable, and 24 or less are still more preferable.

As an aromatic group represented by Ar, the group of the following formula (Ar-1) - formula (Ar-23) is mentioned, for example.

In formulas (Ar-1) to (Ar-23), the symbol * represents a linking portion, and Z ⁰ , Z ¹ and Z ² each independently represent a hydrogen atom, a halogen atom, an alkyl group having 1 to 12 carbon atoms, and a cyano group, nitro group, alkylsulfinyl group with 1 to 12 carbon atoms, alkylsulfonyl group with 1 to 12 carbon atoms, carboxyl group, fluoroalkyl group with 1 to 12 carbon atoms, and fluoroalkyl group with 1 to 12 carbon atoms Alkoxy group, alkylthio group with 1 to 12 carbon atoms, N-alkylamino group with 1 to 12 carbon atoms, N,N-di-alkylamino group with 2 to 12 carbon atoms, N-alkylamino group with 2 to 12 carbon atoms 1-12 N-alkylsulfamoyl groups or N,N-dialkylsulfamoyl groups having 2-12 carbon atoms.

Q ¹ and Q ² each independently represent -CR ^{2' R} 3'-, -S-, -NH-, -NR 2'-, -CO- or -O-, and R ^{2 '} and R ^3' each independently Represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms.

J ¹ and J ² each independently represent a carbon atom or a nitrogen atom.

Y ¹ , Y ² and Y ³ each independently represent an aromatic hydrocarbon group or an aromatic heterocyclic group which may be substituted.

W ¹ and W ² each independently represent a hydrogen atom, a cyano group, a methyl group or a halogen atom, and m represents an integer of 0 to 6.

Examples of the aromatic hydrocarbon group in Y ¹ , Y ² and Y ³ include aromatic hydrocarbon groups having 6 to 20 carbon atoms such as phenyl, naphthyl, anthracenyl, phenanthryl, and biphenyl, and preferably phenyl and naphthalene. group, more preferably phenyl group. Examples of the aromatic heterocyclic group include carbon atoms containing at least one hetero atom (nitrogen atom, oxygen atom, sulfur atom, etc.), such as a furyl group, a pyrrolyl group, a thienyl group, a pyridyl group, a thiazolyl group, and a benzothiazolyl group. The aromatic heterocyclic group of numbers 4 to 20 is preferably a furyl group, a thienyl group, a pyridyl group, a thiazolyl group, and a benzothiazolyl group.

Y ¹ and Y ² may each independently be a substituted polycyclic aromatic hydrocarbon group or polycyclic aromatic heterocyclic group. The polycyclic aromatic hydrocarbon group refers to a condensed polycyclic aromatic hydrocarbon group or a group derived from a collection of aromatic rings. The polycyclic aromatic heterocyclic group refers to a condensed polycyclic aromatic heterocyclic group or a group derived from a collection of aromatic rings.

Z ⁰ , Z ¹ and Z ² are each independently preferably a hydrogen atom, a halogen atom, an alkyl group having 1 to 12 carbon atoms, a cyano group, a nitro group, or an alkoxy group having 1 to 12 carbon atoms, and Z ⁰ is more preferably are a hydrogen atom, an alkyl group having 1 to 12 carbon atoms, or a cyano group, and Z ¹ and Z ² are more preferably a hydrogen atom, a fluorine atom, a chlorine atom, a methyl group, or a cyano group.

Q ¹ and Q ² are preferably -NH-, -S-, -NR ^2' -, and -O-, and R ^2' is preferably a hydrogen atom. Among them, -S-, -O-, and -NH- are particularly preferred.

Among the formulae (Ar-1) to (Ar-23), the formula (Ar-6) and the formula (Ar-7) are preferable from the viewpoint of molecular stability.

In the formulae (Ar-17) to (Ar-23), Y ¹ may form an aromatic heterocyclic group together with the nitrogen atom and Z ⁰ to which it is bonded. The aromatic heterocyclic group includes the aromatic heterocyclic group described above as an aromatic heterocyclic ring which Ar may have, for example, a pyrrole ring, an imidazole ring, a pyrroline ring, a pyridine ring, and a pyrazine ring. Ring, pyrimidine ring, indole ring, quinoline ring, isoquinoline ring, purine ring, pyrrolidine ring, etc. The aromatic heterocyclic group may have a substituent. In addition, Y ¹ may form the aforementioned substituted polycyclic aromatic hydrocarbon group or polycyclic aromatic heterocyclic group together with the nitrogen atom and Z ⁰ to which it is bonded. For example, a benzofuran ring, a benzothiazole ring, a benzoxazole ring, etc. are mentioned. In addition, the compound represented by the said formula (Ar-1) - (Ar-23) can be manufactured according to the method described in Unexamined-Japanese-Patent No. 2010-31223, for example.

The content of the polymerizable liquid crystal compound (A) in the polymerizable liquid crystal composition (A) constituting the retardation layer is, for example, 70 to 99.5 parts by mass relative to 100 parts by mass of the solid content of the polymerizable liquid crystal composition (A), Preferably it is 80-99 mass parts, More preferably, it is 90-98 mass parts. When the content is within the above range, the orientation of the retardation plate tends to improve. Here, the solid content refers to the total amount of components obtained by removing volatile components such as a solvent from the polymerizable liquid crystal composition (A).

The polymerizable liquid crystal composition (A) may contain a polymerization initiator for initiating a polymerization reaction of the polymerizable liquid crystal compound (A). Moreover, the polymerizable liquid crystal composition (A) may contain a photosensitizer, a leveling agent, an additive, etc. as needed.

For the retardation layer, for example, a solvent can be added to the polymerizable liquid crystal composition (A) containing the polymerizable liquid crystal compound (A) and, if necessary, a polymerization initiator, an additive, etc., and a combination can be prepared by mixing and stirring. (hereinafter, also referred to as "retardation film-forming composition"), the composition is applied on a substrate or an alignment film, the solvent is removed by drying, and the resulting coating is made by heating and/or active energy rays. The polymerizable liquid crystal compound (A) in the film is cured to obtain it.

The base material is preferably a base material having transparency. The alignment film is obtained by aligning the polymerizable liquid crystal compound contained in the composition for forming a retardation film in an arbitrary direction. The alignment film may be formed of an alignment polymer. In addition, the alignment film may be a photo-alignment film.

Examples of the oriented polymer include polyamides having an amide bond in the molecule, gelatins, polyimides having an imide bond in the molecule, and polyamic acid and polyvinyl alcohol which are hydrolyzates thereof. , Alkyl modified polyvinyl alcohol, polyacrylamide, polyoxazole, polyethyleneimine, polystyrene, polyvinylpyrrolidone, polyacrylic acid and polyacrylate. Among them, polyvinyl alcohol is preferable. The orientation polymer may be used alone or in combination of two or more.

An alignment film containing an alignment polymer is usually obtained by applying a composition obtained by dissolving an alignment polymer in a solvent (hereinafter, sometimes referred to as an "alignment polymer composition"). cloth on the substrate, and remove the solvent; or, apply the oriented polymer composition on the substrate, remove the solvent, and perform rubbing (rubbing method). The solvent may be any one that can dissolve the components constituting the oriented polymer composition. For example, it can be appropriately selected from the following: aliphatic hydrocarbons such as hexane and octane; aromatic hydrocarbons such as toluene and xylene. family hydrocarbons; alcohols such as ethanol, 1-propanol, isopropanol, 1-butanol; ketones such as methyl ethyl ketone, methyl isobutyl ketone; ethyl acetate, butyl acetate, isobutyl acetate and other esters ;Glycol ethers such as ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, diethylene glycol monoethyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether; ethylene glycol monomethyl ether Esterified glycol ethers such as acetate, propylene glycol monomethyl ether acetate, etc.

The concentration of the oriented polymer in the oriented polymer composition should just be in a range in which the oriented polymer material can be completely dissolved in the solvent, and it is preferably 0.1 to 20% in terms of solid content with respect to the solution, and more preferably It is about 0.1 to 10%.

As the alignment polymer composition, a commercially available alignment film material can be used as it is. As a commercially available alignment film material, SUNEVER (registered trademark, manufactured by Nissan Chemical Industries, Ltd.), OPTMER (registered trademark, manufactured by JSR Corporation), and the like are mentioned.

Examples of the method for applying the oriented polymer composition to the substrate include coating methods such as spin coating, extrusion, gravure coating, die coating, bar coating, and coater methods, and offset printing methods. known methods such as printing methods such as method.

As a method of removing the solvent contained in the oriented polymer composition, a natural drying method, a ventilation drying method, a heat drying method, a vacuum drying method, etc. are mentioned.

In order to impart an alignment control force to the alignment film, a rubbing treatment (rubbing method) may be performed as necessary.

As a method of imparting an orientation control force by a rubbing method, there is a method of bringing a film of an oriented polymer into contact with a rubbing roll that is wound with a rubbing cloth and rotated, and the film of an oriented polymer obtained by polymerizing an orientation The composition is coated on a substrate and annealed to form on the surface of the substrate.

A photo-alignment film is usually obtained by applying a composition (hereinafter, also referred to as "photo-alignment film-forming composition") containing a polymer or monomer having a photoreactive group and a solvent on a On the substrate, polarized light (preferably polarized UV light) is irradiated. The photo-alignment film is more preferable in that the direction of the alignment control force can be arbitrarily controlled by selecting the polarization direction of the polarized light to be irradiated.

The photoreactive group refers to a group that generates liquid crystal alignment ability by light irradiation. Specifically, groups that participate in photoreactions such as orientation induction of molecules by light irradiation, isomerization reactions, dimerization reactions, photocrosslinking reactions, or photolysis reactions, which are sources of liquid crystal alignment ability, can be mentioned. . Among them, groups that participate in a dimerization reaction or a photocrosslinking reaction are preferred from the viewpoint of excellent orientation. The photoreactive group is preferably a group having an unsaturated bond, especially a double bond, and particularly preferably a group selected from the group consisting of carbon-carbon double bond (C=C bond), carbon-nitrogen double bond (C=N bond), A group of at least one selected from the group consisting of a nitrogen-nitrogen double bond (N=N bond) and a carbon-oxygen double bond (C=O bond).

Examples of the photoreactive group having a C=C bond include a vinyl group, a polyalkenyl group, a stilbene group, a stilbazole group, a stilbazolium group, a chalcone group, and a cinnamoyl group. Wait. As a photoreactive group which has a C=N bond, the group which has structures, such as an aromatic Schiff base and an aromatic hydrazone, is mentioned. Examples of the photoreactive group having an N=N bond include an azophenyl group, an azonaphthyl group, an aromatic heterocyclic azo group, a disazo group, a formazan group, and an oxyazo group groups of nitrobenzene structures, etc. As a photoreactive group which has a C=O bond, a benzophenone group, a coumarin group, an anthraquinone group, a maleimide group, etc. are mentioned. These groups may have substituents such as an alkyl group, an alkoxy group, an aryl group, an allyloxy group, a cyano group, an alkoxycarbonyl group, a hydroxyl group, a sulfonic acid group, a haloalkyl group, and the like.

Among them, photoreactive groups that participate in the photodimerization reaction are preferred, and cinnamon is preferred because the amount of polarized light irradiation required for photoalignment is small, and it is easy to obtain a photoalignment film excellent in thermal stability and stability over time. Acyl and chalcone groups. As a polymer which has a photoreactive group, the polymer which has a cinnamoyl group in which the terminal part of this polymer side chain becomes a cinnamic acid structure is especially preferable.

A photo-alignment layer can be formed on a base material by apply|coating the composition for photo-alignment film formation on a base material. As the solvent contained in the composition, the same solvent as the solvent exemplified above as the solvent usable in the composition for forming an alignment film can be exemplified, and the solvent may vary depending on the amount of the polymer or monomer having a photoreactive group. Solubility is appropriately selected.

The content of the polymer or monomer having a photoreactive group in the composition for forming a photo-alignment film can be appropriately adjusted according to the type of polymer or monomer and the thickness of the target photo-alignment film. The mass of the composition for forming an alignment film is preferably at least 0.2% by mass, and more preferably in the range of 0.3 to 10% by mass. The composition for forming a photo-alignment film may contain a polymer material such as polyvinyl alcohol and polyimide, and a photosensitizer within a range not significantly impairing the properties of the photo-alignment film.

As a method of apply|coating the composition for photo-alignment film formation to a base material, the method similar to the method of apply|coating an orientation composition to a base material is mentioned. As a method of removing the solvent from the applied composition for forming a photo-alignment film, for example, a natural drying method, a ventilation drying method, a heating drying method, a vacuum drying method, and the like are mentioned.

In order to irradiate polarized light, a form in which polarized UV light is irradiated directly to the product obtained by removing the solvent from the composition for forming a photo-alignment film applied on a substrate may be irradiated with polarized light from the substrate side, so that A form in which polarized light is transmitted and illuminated. In addition, it is particularly preferable that the polarized light is substantially parallel light. The wavelength of the polarized light to be irradiated is preferably a wavelength in a wavelength region in which the photoreactive group of the polymer or monomer having a photoreactive group can absorb light energy. Specifically, UV (ultraviolet rays) having a wavelength in the range of 250 to 400 nm is particularly preferable. Examples of the light source used for the polarized light irradiation include xenon lamps, high-pressure mercury lamps, ultra-high pressure mercury lamps, metal halide lamps, ultraviolet lasers such as KrF and ArF, and the like, and more preferred are high-pressure mercury lamps, ultra-high pressure mercury lamps, and metal halide lamps. Halide lamps. Among these, a high-pressure mercury lamp, an ultra-high pressure mercury lamp, and a metal halide lamp are preferable because the luminous intensity of ultraviolet rays having a wavelength of 313 nm is high. Polarized UV light can be irradiated by irradiating light from the above-mentioned light source through an appropriate polarizer. As the polarizer, polarizing filters, polarizing prisms such as Glan-Thompson and Glan-Taylor, and wire grid polarizers can be used.

In addition, when performing rubbing or polarized light irradiation, when shielding is performed, it is also possible to form a plurality of regions (patterns) in which the directions of liquid crystal alignment are different.

A groove alignment film is a film having a concavo-convex pattern or a plurality of grooves (grooves) on the film surface. When the polymerizable liquid crystal compound is applied to a film having a plurality of linear grooves arranged at equal intervals, the liquid crystal molecules are aligned in the direction along the grooves.

As a method of obtaining a groove alignment film, a method of exposing the surface of the photosensitive polyimide film through an exposure mask having a slit having a pattern shape, and then performing development and rinsing treatment to form a concavo-convex pattern can be mentioned. A method of forming a UV-curable resin layer before curing on a plate-shaped original plate with grooves on the surface, moving the formed resin layer to a base material, and then curing; and, pressing a roll-shaped original plate with a plurality of grooves on the A method of forming a film of UV-curable resin before curing on a substrate to form unevenness and then curing; and the like.

The thickness of the alignment film (the alignment film or the photo-alignment film containing the alignment polymer) is usually in the range of 10 to 10000 nm, preferably in the range of 10 to 1000 nm, more preferably 500 nm or less, still more preferably 10 to 200 nm, particularly preferably 50 to 150 nm range.

As a method of applying the composition for forming a retardation film to a substrate or the like, coating methods such as spin coating, extrusion, gravure coating, die coating, bar coating, and coater methods can be exemplified known methods such as printing methods such as , offset method, etc.

Next, a dry coating film is formed by removing the solvent by drying or the like under the condition that the polymerizable liquid crystal compound contained in the coating film obtained from the composition for forming a retardation film does not polymerize. As a drying method, a natural drying method, a ventilation drying method, a heating drying, a vacuum drying method, etc. are mentioned.

In addition, in order to phase-transform the polymerizable liquid crystal compound into a liquid phase, the temperature is raised to a temperature equal to or higher than the temperature at which the polymerizable liquid crystal compound is phase-transformed into a liquid phase, and then the temperature is lowered to phase-transform the polymerizable liquid crystal compound into a nematic phase. This phase transition may be performed after removing the solvent in the coating film, or may be performed simultaneously with the removal of the solvent.

A retardation layer, which is a cured layer of the polymerizable liquid crystal composition, is formed by polymerizing the polymerizable liquid crystal compound while maintaining the nematic liquid crystal state of the polymerizable liquid crystal compound. As the polymerization method, a photopolymerization method is preferable. In the photopolymerization, the light irradiated to the dry coating film depends on the type of the photopolymerization initiator and the type of the polymerizable liquid crystal compound contained in the dry coating film (especially, the amount of the polymerizable group contained in the polymerizable liquid crystal compound). type) and its amount are appropriately selected. Specific examples thereof include at least one light selected from the group consisting of visible light, ultraviolet light, infrared light, X-rays, α-rays, β-rays, and γ-rays, and active electron beams. Among them, ultraviolet light is preferable from the viewpoint of easy control of the progress of the polymerization reaction and from the viewpoint that an apparatus widely used in this field can be used as the photopolymerization apparatus, and it is preferable to preselect the polymerization so that the photopolymerization can be performed by ultraviolet light. The type of polymerizable liquid crystal compound and photopolymerization initiator contained in the liquid crystal composition. In addition, the polymerization temperature may be controlled by irradiating light while cooling the dried coating film by an appropriate cooling means during the polymerization.

By employing such a cooling means to carry out the polymerization of the polymerizable liquid crystal compound at a lower temperature, a polarizing plate can be suitably formed even if a material with low heat resistance is used for the base material. A patterned retardation plate can also be obtained by performing shielding, development, etc. during photopolymerization.

Examples of the light source for the active energy rays include low-pressure mercury lamps, medium-pressure mercury lamps, high-pressure mercury lamps, ultra-high-pressure mercury lamps, xenon lamps, halogen lamps, carbon arc lamps, tungsten lamps, gallium lamps, excimer lasers, LED light sources, chemical lamps, black light lamps, microwave-excited mercury lamps, metal halide lamps, etc. that emit light in the wavelength range of 380 to 440 nm.

The ultraviolet irradiation intensity is usually 10 to 3,000 mW/cm ² . The ultraviolet irradiation intensity is preferably an intensity in a wavelength region effective for activation of the photopolymerization initiator. The light irradiation time is usually 0.1 second to 10 minutes, preferably 1 second to 5 minutes, more preferably 5 seconds to 3 minutes, and even more preferably 10 seconds to 1 minute. When irradiated one or more times with such ultraviolet irradiation intensity, the cumulative light amount is 10 to 3,000 mJ/cm ² , preferably 50 to 2,000 mJ/cm ² , and more preferably 100 to 1,000 mJ/cm ² .

The thickness of the retardation layer can be appropriately selected according to the display device to which it is applied, but from the viewpoints of thinning and flexibility, it is preferably 0.1 to 10 μm, more preferably 1 to 5 μm, and even more preferably 1 to 3 μm.

<Optical Compensation Plate>

The laminated body for organic EL displays of this invention can further combine an optical compensation plate as needed. The optical compensation plate has an optical function of compensating the viewing angle and color of the liquid crystal display device, and is preferably formed by orienting a liquid crystal material.

The optical compensation plate is more preferably formed of a polymer of a polymerizable liquid crystal compound, and satisfies the following formula (5):

-30nm≤Rth(550)≤-100nm (5)

(Rth(550) represents the in-plane retardation in the film thickness direction when irradiated at a wavelength of 550 nm.)

As a liquid crystal substance preferably used for such an optical compensation plate, a side chain type liquid crystal polymer compound is mentioned. The side chain type liquid crystalline polymer compound is formed by the mesogenic group, which is the core unit that makes the liquid crystal layer appear, to the flexible main chain in the form of a side chain through a flexible chain. For example, polyacrylate, A polymethacrylate, a polysiloxane, etc. as a main chain skeleton, and what has a mesogenic group as a side chain via a spacer formed by a conjugated atomic group etc. as needed, etc. are mentioned. In addition, in order to control the tensile modulus of elasticity of the film, oxygen may be provided at the terminal on the opposite side to the main chain in view of the mesogenic group of the side chain through a spacer formed by a conjugated atomic group or the like if necessary. Heterocyclobutyl group, epoxy group, vinyl ether group, etc. are polymerizable functional groups used for crosslinking.

The thickness of the optical compensation plate is, for example, about 0.1 to 30 μm, preferably about 0.5 to 25 μm, and more preferably about 3 to 20 μm.

<Circular polarizer>

The circular polarizing plate in the present invention includes a polarizing plate and a retardation plate, and the polarizing plate includes a polarizing plate and a protective film. The polarizing plate has a protective film on the opposite side of the retardation plate.

In the above-mentioned circularly polarizing plate, the polarizing plate and the retardation plate may be laminated via an adhesive layer or may be laminated via an adhesive layer, but preferably they are laminated via an adhesive layer. That is, the circularly polarizing plate preferably has a structure in which a polarizing plate, an adhesive layer, and a retardation plate are stacked in this order.

As a pressure-sensitive adhesive layer for laminating a polarizing plate and a retardation plate, a pressure-sensitive adhesive layer having a transmittance of 10% or less at a wavelength of 400 nm (hereinafter, may be referred to as a near-infrared absorbing pressure-sensitive adhesive layer.) is preferable.

It does not specifically limit as a pressure-sensitive adhesive composition which forms the pressure-sensitive adhesive layer which laminated|stacked a polarizing plate and a retardation plate, A known pressure-sensitive adhesive composition can be used.

The pressure-sensitive adhesive composition for forming the near-infrared absorbing pressure-sensitive adhesive layer is not particularly limited. For example, the pressure-sensitive adhesive composition described in JP-A No. 2017-119700 is exemplified. For example, an adhesive composition of a compound of light having a wavelength of 385 nm to 405 nm) is more preferably an adhesive composition containing a light selective absorption compound having a merocyanine structure.

The circularly polarizing plate of the present invention has a water vapor transmittance of 100 g/m ² /24 hours or less, and a transmittance of 380 nm light of 1% or less. Thereby, an organic EL display excellent in display characteristics, flexibility, and deterioration over time can be obtained.

The water vapor transmission rate was measured according to JIS Z 0208 under the conditions of 40° C. and 90% relative humidity, and was calculated as the amount of water passing through the film in 24 hours per 1 m ² of film area. When the water vapor transmission rate exceeds 100 g/m ² /24 hours, the durability of the obtained organic EL display deteriorates. The water vapor transmission rate is preferably 60 g/m ² /24 hours or less, more preferably 30 g/m ² /24 hours or less, still more preferably 10 g/m ² /24 hours or less, and may be a low water vapor below the measurement limit transmittance.

Regarding the transmittance of light, the transmittance at 380 nm was measured using a spectrophotometer (UV-3150; manufactured by Shimadzu Corporation). More preferably, the transmittances of both 380 nm and 400 nm are determined. The transmittance of light at these wavelengths is preferably 0.5% or less, and more preferably 0.3% or less.

Regarding the above-mentioned circularly polarizing plate, the oxygen permeability is preferably 30 cc/atm/m ² /24 hours or less.

The oxygen permeability was measured in accordance with JIS K 7126 using an oxygen permeability measuring device (OX-TRANML, manufactured by MOCON) under the conditions of 23° C. and 50% relative humidity. From the viewpoint of further improving the durability of the organic EL display, the oxygen permeability is more preferably 20 cc/atm/m ² /24 hours or less, and still more preferably 10 cc/atm/m ² /24 hours or less.

<Adhesive layer (1)>

In the present invention, there is no particular one as an adhesive composition for forming an adhesive layer (in this specification, this adhesive layer may be referred to as "adhesive layer (1)") laminated with a circularly polarizing plate. For example, suitable adhesives such as acrylic, silicone, polyester, polyurethane, polyamide, polyether, and rubber can be used. Among them, pressure-sensitive acrylic adhesives are preferred from the viewpoints of optical transparency, adhesive properties, weather resistance, and the like. The pressure-sensitive adhesive layer (1) is usually laminated on a retardation plate of a circularly polarizing plate. Other layers (separators, etc.) may be further laminated on the opposite side of the adhesive layer (1) to the surface on which the circularly polarizing plate is laminated.

It should be noted that the adhesive layer (1) and the adhesive layer used for lamination of the polarizing plate and the retardation plate can be functionalized according to the application, such as dispersing various diffusing agents to impart diffusivity, or mixing various diffusing agents. A conductive substance is used to impart antistatic properties, etc.

From the viewpoints of flexibility and visibility of the display device, the thickness of the laminate in which the circularly polarizing plate and the pressure-sensitive adhesive layer of the present invention are laminated is preferably 100 μm or less, and more preferably 90 μm or less.

<Organic EL Display Device (Organic EL Display)>

The present invention includes a display device including the laminate for an organic EL display of the present invention.

Examples of display devices include liquid crystal display devices, organic electroluminescence (EL) display devices, inorganic electroluminescence (EL) display devices, touch panel display devices, electron emission display devices (field emission display devices (FED, etc.), Surface field emission display (SED)), electronic paper (display using electronic ink and electrophoretic elements), plasma display, projection display (grating light valve (GLV) display, digital Micromirror device (DMD) display device, etc.) and piezoelectric ceramic display, etc. The liquid crystal display device includes any of a transmission type liquid crystal display device, a semi-transmission type liquid crystal display device, a reflection type liquid crystal display device, a direct-view type liquid crystal display device, a projection type liquid crystal display device, and the like. These display devices may be display devices that display two-dimensional images, or may be stereoscopic display devices that display three-dimensional images. In particular, as the display device of the present invention, an organic EL display device and a touch panel display device are preferable, and an organic EL display device is particularly preferable.

Example

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples. Unless otherwise specified, "%" and "parts" in Examples and Comparative Examples are "% by mass" and "parts by mass".

[Example 1]

<Production of polarizing plate>

[Polarizing plate: Manufacture of iodine PVA type polarizing plate]

A polyvinyl alcohol film with a thickness of 30 μm (PVA: average degree of polymerization of about 2400, saponification degree of 99.9 mol% or more) was uniaxially stretched about 5 times by dry stretching, and immersed at 40° C. while maintaining the tightened state. in pure water for 40 seconds. Then, it was immersed for 30 seconds in a dyeing aqueous solution having a mass ratio of iodine/potassium iodide/water of 0.044/5.7/100 at 28° C. to perform dyeing treatment. Next, it was immersed for 120 seconds in a boric acid aqueous solution having a mass ratio of potassium iodide/boric acid/water of 11.0/6.2/100 at 70°C. Next, it was washed with pure water at 8° C. for 15 seconds, then dried at 60° C. for 50 seconds while maintaining a tension of 300 N, and then dried at 75° C. for 20 seconds to obtain adsorption orientation in the polyvinyl alcohol film. A polarizer with a thickness of 12 μm with iodine.

A water-based adhesive was injected between the obtained polarizer and a cycloolefin film (ZF14, manufactured by ZEON Co., Ltd.), and they were bonded together with a nip roll. The obtained bonding product was dried at 60° C. for 2 minutes while maintaining the tension at 430 N/m to obtain a polarizing plate I having a cycloolefin film (COP) as a protective film on one surface. In addition, the said water-based adhesive was added to 100 parts of water by adding 3 parts of carboxyl-modified polyvinyl alcohol (Kuraray Poval KL318; manufactured by Kuraray Co., Ltd.), and a water-soluble polyamide epoxy resin (Sumirez Resin 650; Sumika). Chemtex Co., Ltd. manufactured, the solid content concentration 30% aqueous solution) 1.5 parts was prepared.

<Production of retardation plate>

[Preparation of a composition for forming a photo-alignment film]

5 parts of the following photo-alignment materials described in Japanese Patent Laid-Open No. 2013-033249 and 95 parts of cyclopentanone (solvent) were mixed, and the resulting mixture was stirred at 80° C. for 1 hour to obtain a photo-alignment film formation combination.

(photo-alignment material)

[Preparation of polymerizable liquid crystal composition]

Polymerizable liquid crystal compound A-1 (86.0 parts), polymerizable liquid crystal compound A-2 (14.0 parts), and polyacrylate compound (leveling agent/BYK-361N; manufactured by BYK-Chemie) (0.12 parts) and 2-dimethylamino-2-benzyl-1-(4-morpholinophenyl)-1-butanone (photopolymerization initiator/Irgacure369; manufactured by Ciba Specialty Chemicals) (3.0 parts) , the polymerizable liquid crystal composition (A1) containing the polymerizable liquid crystal compound A-1 and the polymerizable liquid crystal compound A-2 was obtained.

Polymerizable Liquid Crystal Compound A-1:

Polymerizable Liquid Crystal Compound A-2:

[Production of retardation plate]

Using a corona treatment device (AGF-B10; manufactured by Kasuga Electric Co., Ltd.), under the conditions of an output power of 0.3 kW and a treatment speed of 3 m/min, the cycloolefin polymer film (COP; ZF-14; Japan ZEON Co., Ltd. company system) to be processed once. The above-mentioned composition for forming a photo-alignment film was coated on the corona-treated surface with a bar coater, dried at 80° C. for 1 minute, and a polarized UV light irradiation device (SPOT CURE SP-7 with a polarizer unit; Ushio Electric Co., Ltd.), polarized UV light exposure was performed at a cumulative light amount of 100 mJ/cm ² to form an alignment film. The thickness of the obtained alignment film was measured with an ellipsometer M-220 (manufactured by JASCO Corporation) and found to be 100 nm.

Next, the previously prepared polymerizable liquid crystal composition (A1) containing the polymerizable liquid crystal compound was applied to the above-mentioned conditions with the wire of the bar coater set at #30 and the speed at 50 mm/sec. On the alignment film, it was dried at 120° C. for 1 minute. Then, using a high-pressure mercury lamp (Uniicure VB-15201BY-A; manufactured by Ushio Electric Co., Ltd.), ultraviolet rays were irradiated from the surface side coated with the polymerizable liquid crystal composition (A1) (in a nitrogen atmosphere, the cumulative light amount at a wavelength of 313 nm: 500 mJ/cm ² ), thereby forming a laminate of the retardation layer and the cycloolefin polymer film. The thickness of the obtained retardation layer was measured with a laser microscope (LEXT; manufactured by Olympus Corporation) and found to be 2.3 μm.

When the retardation value at the wavelength of 550 nm of the obtained retardation layer was measured, it was Re(550)=140 nm.

In addition, when the retardation values of the obtained retardation layer at wavelengths of 450 nm and 650 nm were measured, Re(450)/Re(550)=0.85 and Re(650)/Re(550)=1.05.

<Production of circular polarizer>

Using an adhesive (Lintec Co., Ltd., acrylic adhesive (colorless, transparent, non-oriented), polarizing plate I and retardation plate B are formed by the absorption axis of polarizing plate I and the slow axis of retardation plate B. The cycloolefin polymer film of the retardation plate was peeled off, and the circularly polarizing plate 1 was produced after bonding so that the angle ((theta)) might become 45 degrees.

<Preparation of laminate for organic EL display>

An acrylic pressure-sensitive adhesive (manufactured by Lintec, 15 μm in film thickness) was laminated on the retardation plate of the obtained circularly polarizing plate to obtain a laminate for an organic EL display.

Table 1 summarizes the layer structure of the obtained laminate for organic EL displays.

<Measurement of water vapor transmission rate>

The obtained circularly polarizing plate was measured under the conditions of 40° C. and 90% relative humidity according to JIS Z 0208, and the amount of water passing through the film in 24 hours per 1 m ² of film area was calculated. The results are shown in Table 2.

<Measurement of oxygen permeability>

The obtained circularly polarizing plate was measured under the conditions of 23° C. and a relative humidity of 50% using an oxygen transmittance measuring apparatus (OX-TRANML, manufactured by MOCON) based on JIS K7126. The results are shown in Table 2.

<Measurement of transmittance>

The transmittance at 380 nm and 400 nm was measured about the obtained circularly polarizing plate using a spectrophotometer (UV-3150; manufactured by Shimadzu Corporation). The results are shown in Table 2.

<Weather resistance test>

The acrylic pressure-sensitive adhesive of the obtained laminate for organic EL displays was bonded to a display device obtained by removing the front glass and the polarizing plate from "Galaxy S5" manufactured by SAMSUNG. Check the reflected hue when the power of the display device is turned OFF (for black display) or turned ON (for white display). The results of the initial appearance and the appearance after a 100-hour accelerated weather resistance test in a sunlight weather meter (100-hour accelerated weather resistance test) are shown in Table 3. It should be noted that the front reflection hue ("white display" and "black display" in Table 3) is the hue obtained by visually observing the sample from the front at a distance of 50 cm to confirm the hue, and the oblique reflection hue (in Table 3, "" "Oblique black display") is the hue when the sample is visually observed from a direction of an elevation angle of 60° and an azimuth angle of 0 to 360° at a distance of 50 cm.

<Flexibility test>

A glass plate with a thickness of 0.7 mm was placed on the coating film surface side of the obtained circularly polarizing plate, the laminate was bent 180 degrees so as to lie down on the glass plate, and then the bending was observed with a magnifying glass of 10 times through the light of a fluorescent lamp. Parts, check for wrinkles and cracks. The case where no wrinkles and cracks were observed was designated as A, the case where wrinkles were slightly observed was designated as B, and the case where wrinkles and cracks were observed was designated as C. The results are shown in Table 3.

[Example 2]

In addition to changing the adhesive between the polarizing plate and the retardation plate in Example 1 to the adhesive (near-ultraviolet PSA) described in Example 2 of Japanese Patent Application Laid-Open Publication No. 2017-120430, the same Example 1 was produced in the same manner.

[Example 3]

[Production of retardation plate]

<Preparation of Oriented Polymer Composition (1)>

Water was added to a commercially available polyvinyl alcohol (polyvinyl alcohol 1000 complete saponification type, manufactured by Wako Pure Chemical Industries, Ltd.), and it was heated at 100° C. for 1 hour to obtain an oriented polymer composition (1). The solid content in the oriented polymer composition (1) was 2 mass %.

<Preparation of Composition (B-1)>

A polymerizable liquid crystal compound represented by the formula (LC242), a polymerization initiator (manufactured by BASF; Irgacure 907), a polyacrylate compound (leveling agent/BYK-361N; manufactured by BYK-Chemie), and a reaction additive (Laromer manufactured by BASF) (registered trademark) LR-900) and propylene glycol 1-monomethyl ether 2-acetate (PGMEA) were mixed to obtain a composition (B-1). In addition, the ratio of each compound in the composition (B-1) is 19.2 mass % of polymerizable liquid crystal compound, 0.5 mass % of polymerization initiator, 0.1 mass % of leveling agent, 1.1 mass % of reaction additive, and PGMEA 79.1 %.

<Production of retardation layer 1>

The oriented polymer composition (1) was coated on the saponified triacetyl cellulose film (hereinafter, sometimes referred to as TAC) and heated and dried to obtain an oriented polymer film having a thickness of 80 nm. A rubbing treatment was performed on the surface of the obtained oriented polymer film. Using a bar coater, the composition (B-1) was coated thereon, dried at 100° C. for 1 minute, and then irradiated with ultraviolet rays with a high-pressure mercury lamp (in a nitrogen atmosphere, cumulative light amount at a wavelength of 365 nm: 1200 mJ/cm ² ), Thus, the retardation layer 1 is formed. When the film thickness of the obtained retardation layer 1 was measured with a laser microscope, the film thickness was 1.94 μm. The retardation value of the obtained retardation layer 1 was measured and found to be Re(550)=269 nm. In addition, when the retardation values at a wavelength of 450 nm and a wavelength of 650 nm were measured, Re(450)/Re(550)=1.08 and Re(650)/Re(550)=0.99.

<Production of retardation layer 2>

The oriented polymer composition (1) was coated on the saponified triacetyl cellulose film (manufactured by Konica Minolto Co., Ltd., KC4UY) and dried by heating to obtain an oriented polymer film having a thickness of 82 nm. The surface of the obtained oriented polymer film was subjected to a rubbing treatment at an angle of 15° to the longitudinal direction of the TAC, the composition (B-1) was applied thereon using a bar coater, and dried at 100° C. for 1 Then, the retardation layer 2 was formed by irradiating ultraviolet rays using a high-pressure mercury lamp (in a nitrogen atmosphere, cumulative light amount at a wavelength of 365 nm: 1200 mJ/cm ² ). When the film thickness of the obtained retardation layer 2 was measured with a laser microscope, the film thickness was 973 nm. The retardation value of the obtained retardation layer 2 was measured and found to be Re(550)=135 nm. In addition, when the retardation values at a wavelength of 450 nm and a wavelength of 650 nm were measured, Re(450)/Re(550)=1.07 and Re(650)/Re(550)=0.98.

<Lamination of retardation layer 1 and retardation layer 2>

The retardation plate 3 was produced by bonding together using a photocurable adhesive so that the angle of the slow axis of the retardation layer 1 and the slow axis of the retardation layer 2 obtained above would be 60°.

<Production of circular polarizer>

Using an adhesive, the angle (θ) formed by the absorption axis of the polarizing plate 1 and the slow axis of the retardation layer 1 is 15°, and the angle formed by the absorption axis of the polarizing plate 1 and the slow axis of the retardation layer 2 ( θ) was 75°, the polarizing plate 1 and the retardation layer 1 side of the retardation plate 3 were bonded together, and then the cycloolefin polymer film of the retardation plate was peeled off to produce a circular polarizing plate.

<Preparation of laminate for organic EL display>

Except having used the retardation plate 3 obtained above, it carried out similarly to Example 1, and produced the laminated body for organic electroluminescent displays.

[Example 4]

[Production of Optical Compensation Plate]

<Preparation of Oriented Polymer Composition (2)>

2-butoxyethanol was added to SUNEVER SE-610 (manufactured by Nissan Chemical Industries, Ltd.), which is a commercially available oriented polymer, to obtain an oriented polymer composition (2). In addition, the solid content of the oriented polymer composition (2) is 1 mass %.

Using a corona treatment device, the surface of the cycloolefin film was treated once under the conditions of an output of 0.3 kW and a treatment speed of 3 m/min. The orientation polymer composition (2) was apply|coated to the surface which performed the corona treatment using a bar coater, and it dried at 90 degreeC for 1 minute, and obtained the orientation film. The thickness of the obtained alignment film was measured with a laser microscope and found to be 34 nm. Next, the composition (B-1) was coated on the alignment film using a bar coater, dried at 90° C. for 1 minute, and then irradiated with ultraviolet rays using a high-pressure mercury lamp (in a nitrogen atmosphere, cumulative light amount at a wavelength of 365 nm: 1000 mJ/ cm ² ), thereby obtaining an optical compensation plate. The film thickness of the obtained optical compensation plate was measured with a laser microscope, and the film thickness was 450 nm. In addition, when the retardation value at the wavelength of 550 nm of the obtained optical compensation plate was measured, it was found that Re(550)=1 nm and Rth(550)=-70 nm. It should be noted that the retardation value of the cycloolefin film itself at a wavelength of 550 nm is about 0.

Using the acrylic pressure-sensitive adhesive described in Example 1, the circularly polarizing plate produced in Example 1 was bonded to the optical compensation plate obtained above to obtain a circularly polarizing plate with an optical compensation plate. On the optical compensation plate of the obtained circularly polarizing plate with an optical compensation plate, an acrylic pressure-sensitive adhesive was further laminated|stacked, and the laminated body for organic electroluminescent displays was obtained.

[Example 5]

By the same method as Example 1 described in International Publication No. WO 2017/014279, a 30 μm polyimide-based film (PI film) was produced.

It produced similarly to Example 2 except having used the said polyimide-type film (PI film) as a protective film instead of a cycloolefin polymer film.

[Example 6]

By the same method as Example 1 described in International Publication No. WO 2017/014279, a 30 μm polyimide-based film (PI film) was produced.

Except having used the said polyimide-type film as a protective film, it carried out similarly to Example 3, and produced it.

[Example 7]

By the same method as Example 1 described in International Publication No. WO 2017/014279, a 30 μm polyimide-based film (PI film) was produced.

As the protective film, the above-mentioned polyimide-based film was used, and the same procedure as in Example 4 was carried out, except that the adhesive used for lamination of the retardation plate and the polarizing plate was the acrylic adhesive described in Example 1. to make.

[Comparative Example 1]

<Production of polarizing plate>

A triacetyl cellulose film (TAC; KC2UA; manufactured by Konica Minolto Co., Ltd.) was placed on both sides of the polarizer, and a water-based adhesive was injected between the layers, followed by bonding with a nip roll. The obtained adhesive was dried at 60° C. for 2 minutes while maintaining the tension at 430 N/m to obtain a polarizing plate having a triacetyl cellulose film as a protective film on both sides. In addition, the said water-based adhesive was added to 100 parts of water by adding 3 parts of carboxyl group-modified polyvinyl alcohol (Kuraray Poval KL318; manufactured by Kuraray Co., Ltd.), and a water-soluble polyamide epoxy resin (Sumirez Resin 650; Sumika). Chemtex Co., Ltd. manufactured, the solid content concentration 30% aqueous solution) 1.5 parts was prepared.

<Production of laminate for organic EL display>

A laminate for an organic EL display was produced in the same manner as in Example 1, except that a polycarbonate-based copolymer resin film (WRS-143; manufactured by Teijin Corporation) was used as a retardation plate.

[Comparative Example 2]

Except having used the retardation plate 2 produced in Example 3, it carried out similarly to the comparative example 1, and produced the laminated body for organic EL displays.

[Comparative Example 3]

Except having used the polarizing plate produced in the comparative example 1, it carried out similarly to Example 1, and produced the laminated body for organic EL displays.

[Table 1]

In addition, "COP" in Table 1 represents cycloolefin film, "PI" represents polyimide, "TAC" represents triacetyl cellulose film, "PVA" represents polyvinyl alcohol, and "PSA" represents acrylic adhesive. In addition, Re represents Re(550), α=Re(450)/Re(550), β=Re(650)/Re(550), and Rth represents the in-plane retardation in the film thickness direction.

[Table 2]

[table 3]

As can be seen from the results of Tables 2 and 3 above, in Examples 1 to 7 that satisfy the requirements of the present invention, the appearance after the 100-hour accelerated weather resistance test was almost unchanged from the initial appearance, and the bendability was also maintained. initial performance. In Comparative Examples 1 to 3, the appearance after the 100-hour accelerated weather resistance test changed from the initial appearance. In particular, in the comparative examples, the water vapor transmission rates were all 700 g/m ² /24 hours, which greatly exceeded the reference value of 100 g/m ² /24 hours, so it can be understood that the weather resistance deteriorated.

Claims (16)

1. A laminate for an organic E L display, which is a laminate comprising a circularly polarizing plate and a pressure-sensitive adhesive layer laminated thereon,

the thickness of the laminate is 100 [ mu ] m or less,

the circular polarizing plate comprises a polarizing plate and a phase difference plate,

the polarizing plate comprises a polarizer and a protective film, and has the protective film only on the side of the polarizer opposite to the side on which the phase difference plate is laminated,

the circular polarizing plate has a water vapor transmission rate of 100g/m²Less than 24 hours, and

the circularly polarizing plate has a transmittance at 380nm of 1% or less.

2. The laminate for organic E L displays according to claim 1, wherein the polarizer is a polarizer formed of a polyvinyl alcohol resin film.

3. The laminate for organic E L displays according to claim 1 or 2, wherein the circularly polarizing plate has a transmittance at 400nm of 1% or less.

4. The laminate for organic E L displays according to any one of claims 1 to 3, wherein the retardation plate comprises only one retardation layer comprising a polymer of a polymerizable liquid crystal compound, and the retardation plate satisfies all of the following formulae (1), (2) and (3),

Re(450)/Re(550)≤1.00 (1)

1.00≤Re(650)/Re(550) (2)

100nm≤Re(550)≤180nm (3)

in the formula, Re (λ) represents an in-plane phase difference value with respect to light having a wavelength λ nm.

5. The laminate for organic E L display of claim 4, wherein an angle formed by the slow axis of the retardation plate and the absorption axis of the polarizing plate is substantially 45 degrees.

6. The laminate for organic E L displays according to any one of claims 1 to 3, wherein the retardation plate comprises a first retardation layer and a second retardation layer in this order from the polarizing plate side,

the first retardation layer and the second retardation layer are each a polymer of a polymerizable liquid crystal compound,

the first retardation layer satisfies the following expression (4),

the second retardation layer satisfies the relationship of formula (3),

the phase difference plate satisfies the relation between the formula (1) and the formula (2),

Re(450)/Re(550)≤1.00 (1)

1.00≤Re(650)/Re(550) (2)

100nm≤Re(550)≤180nm (3)

200nm≤Re(550)≤300nm (4)

in the formula, Re (λ) represents an in-plane phase difference value with respect to light having a wavelength λ nm.

7. The laminate for organic E L displays according to any one of claims 1 to 6, further comprising an optical compensation plate comprising a polymer of a polymerizable liquid crystal compound satisfying the following formula (5),

-30nm≤Rth(550)≤-100nm (5)

rth (550) represents an in-plane retardation in the film thickness direction with respect to light having a wavelength of 550 nm.

8. The laminate for organic E L displays according to any one of claims 1 to 6, wherein the circularly polarizing plate comprises a pressure-sensitive adhesive layer having a transmittance at 400nm of 10% or less.

9. The laminate for organic E L displays according to any one of claims 1 to 7, wherein the protective film is a cycloolefin film.

10. The laminate for organic E L displays according to any one of claims 1 to 7, wherein the protective film is a polyimide film or a polyamideimide film.

11. A circularly polarizing plate in which at least a polarizing plate, an adhesive layer and a phase difference plate are laminated in this order,

the polarizing plate comprises a polarizer and a protective film, and has the protective film only on the side of the polarizer opposite to the side on which the phase difference plate is laminated,

the phase difference plate satisfies the relation of the formula (1) and the formula (2),

the circular polarizing plate has a water vapor transmission rate of 100g/m²Less than 24 hours, and

the transmittance at 380nm of the circularly polarizing plate is 1% or less,

Re(450)/Re(550)≤1.00 (1)

1.00≤Re(650)/Re(550) (2)。

12. the circularly polarizing plate of claim 11, wherein the polarizer is a polarizer formed of a polyvinyl alcohol resin film.

13. The circularly polarizing plate of claim 11 or 12, wherein the transmittance at 400nm of the circularly polarizing plate is 1% or less.

14. The circularly polarizing plate of any one of claims 11 to 13, wherein the adhesive layer has a transmittance at 400nm of 10% or less.

15. The circularly polarizing plate of any one of claims 11 to 14, wherein the protective film is a cycloolefin film.

16. The circularly polarizing plate of any one of claims 11 to 15, wherein the protective film is a polyimide film or a polyamideimide film.