TW202035116A - Laminate for organic EL display and circular polarizing plate used therefor wherein the organic EL display is excellent in display characteristics, flexibility and excellent deterioration over the years - Google Patents

Abstract

The present invention provides a laminate for an organic EL display, which includes a circular polarizing plate capable of protecting the organic EL panel even when there is no glass on the outermost surface. Based on this, the object of the present invention is to provide the organic EL display which is excellent in display characteristics, flexibility and excellent deterioration over the years and the circular polarizing plate used for it. The present invention provides a laminate for an organic EL display, which is a laminate formed by laminating a circular polarizing plate and an adhesive layer, and the thickness of the laminate is 100 [mu]m or less. The circular polarizing plate includes a polarizing plate and a phase differential plate. The polarizing plate includes a polarizing element and a protective film, and the protective film is only provided on the side opposite to the surface of the polarizing element on which the phase difference plate is laminated. The water vapor transmission rate of the circular polarizing plate is 100 g/m2/24 hrs or less, and the 380 nm transmittance of the above circular polarizing plate is 1% or less.

Description

Laminated body for organic EL display and circular polarizing plate used therefor

The present invention relates to a laminate for organic EL (Electroluminescence) displays, and more particularly to a laminate for organic EL displays with a specific circular polarizing plate.

In recent years, with the popularization of thin displays, displays equipped with organic EL panels (organic EL display devices) have become popular. The organic EL panel has the following problem: Because the internal metal electrodes reflect external light, it is impossible to obtain a clear black display. To solve this problem, by installing the circular polarizing plate on the viewing surface, it is possible to suppress the reflection of external light. That is, the order of the layers from the viewer is protective glass→circular polarizing plate→organic EL panel. Circular polarizers can usually be produced by stacking polarizers and phase difference plates. As a polarizing plate, it is usually used to stretch a polyvinyl alcohol (PVA) film and layer a transparent protective film on a polarizing element dyed with iodine, but as a retardation plate, use a stretched film or λ aligned by liquid crystal molecules /4 plate, etc., among them, it is suitable to use a λ/4 plate with the property that the longer the display wavelength, the greater the birefringence (inverse wavelength dispersion characteristics). In addition, in order to suppress the change of the reflected hue when viewed from an oblique direction, it is proposed in Patent Document 1 [Japanese Patent Laid-Open No. 2015-163935] to further include a vertical polymer hardened rod-shaped liquid crystal in a state where the rod-shaped liquid crystal is vertically aligned. Circular polarizer for aligning liquid crystal hardened film. [Prior Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. 2015-163935

[The problem to be solved by the invention]

Regarding the organic EL display device, research has been conducted on its application in a soft form, and the use of no glass on the outermost surface of the device has been studied. However, it is known that the organic EL panel may be degraded when the glass is driven in a state where the glass has no barrier properties to water (water vapor) or oxygen. In addition, it can be seen that in order to obtain good flexibility, the circular polarizer itself needs to be thinned.

Therefore, the object of the present invention is to provide a laminate for an organic EL display, which can protect the circular polarizing plate of the organic EL panel even when there is no glass on the outermost surface, and based on this, provide a display characteristic, flexibility and Organic EL display device with excellent deterioration over the years and its circular polarizing plate. [Technical means to solve the problem]

The present invention has the following aspects: [1] A laminate for an organic EL display, which is a laminate formed by laminating a circular polarizing plate and an adhesive, and the thickness of the laminate is 100 μm or less, the circular polarizing plate Including a polarizing plate and a retardation plate. The polarizing plate includes a polarizing element and a protective film, and the protective film is only provided on the opposite side of the side where the polarizing element is laminated with the retardation plate. The water vapor transmission rate of the circular polarizing plate is 100 g/ m ² /24 hrs or less, and the 380 nm transmittance of the circular polarizer is less than 1%. [2] The laminate for an organic EL display according to [1], wherein the polarizing element is formed of a polyvinyl alcohol-based resin film. [3] The laminate for an organic EL display according to [1] or [2], wherein the circular polarizing plate has a transmittance of 1% or less at 400 nm. [4] The laminate for an organic EL display according to any one of [1] to [3], wherein the above-mentioned retardation plate includes only one retardation layer of a polymer containing a polymerizable liquid crystal compound, and satisfies the following All of formula (1), formula (2) and formula (3). Re(450)/Re(550)≦1.00 (1) 1.00≦Re(650)/Re(550) (2) 100 nm≦Re(550)≦180 nm (3) (where, Re(λ) means In-plane retardation value for light of wavelength λ nm) [5] The laminated body for organic EL displays as in [4], wherein the angle formed by the retardation axis of the retardation plate and the absorption axis of the polarizer is substantially 45 degree. [6] The laminate for an organic EL display according to any one of [1] to [3], wherein the phase difference plate includes a first phase difference layer and a second phase difference layer in order from the polarizing plate side, and the first phase difference layer The retardation layer and the second retardation layer are polymers of polymerizable liquid crystal compounds. The first retardation layer satisfies the relationship of the following formula (4), and the second retardation layer satisfies the relationship of the formula (3). Satisfy the relationship between formula (1) and formula (2). Re(450)/Re(550)≦1.00 (1) 1.00≦Re(650)/Re(550) (2) 100 nm≦Re(550)≦180 nm (3) 200 nm≦Re(550)≦300 nm (4) (In the formula, Re(λ) represents the in-plane retardation value to light of wavelength λ nm) [7] As in any one of [1] to [6], the laminate for organic EL displays, which Furthermore, it has an optical compensation plate of a polymer containing a polymerizable liquid crystal compound satisfying the following formula (5). -30 nm≦Rth(550)≦-100 nm (5) (Rth(550) represents the in-plane retardation in the thickness direction of the light with a wavelength of 550 nm) [8] As in any of [1] to [6] A laminate for an organic EL display, wherein the circular polarizing plate includes an adhesive layer with a transmittance of 10% or less at 400 nm. [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 polyimide film. [11] A circular polarizing plate, which is formed by laminating at least a polarizing plate, an adhesive layer, and a retardation plate in this order, and the polarizing plate includes a polarizing element and a protective film, and only has a phase in the laminated layer of the polarizing element The opposite side of the difference plate has a protective film, the above-mentioned retardation plate satisfies the relationship of formula (1) and formula (2), the water vapor transmission rate of the above-mentioned circular polarizing plate is 100 g/m ² /24 hrs or less, and the above The 380 nm transmittance of the circular polarizer is less than 1%. Re(450)/Re(550)≦1.00 (1) 1.00≦Re(650)/Re(550) (2) [12] The circular polarizer as in [11], wherein the above-mentioned polarizing element is made of polyvinyl alcohol The resin film is formed. [13] The circular polarizing plate of [11] or [12], wherein the transmittance of the circular polarizing plate at 400 nm is less than 1%. [14] The circular polarizing plate of any one of [11] to [13], wherein the 400 nm transmittance of the adhesive layer is less than 10%. [15] The circularly polarizing plate of any one of [11] to [14], wherein the protective film is a cycloolefin film. [16] The circular polarizing plate according to any one of [11] to [15], wherein the protective film is a polyimide film or a polyimide film. [Effects of Invention]

The present invention can provide an organic EL display device with excellent display characteristics, flexibility, and deterioration over the years, and a circular polarizing plate used for the organic EL display device even when there is no glass on the outermost surface of the organic EL display device.

The organic EL display of the present invention is formed by laminating a circular polarizing plate and an adhesive with a laminated system, and the circular polarizing plate includes a polarizing plate and a phase difference plate, and the polarizing plate includes a polarizing element and a protective film. The polarizing plate has a protective film on the surface of the polarizing element on the opposite side of the laminated phase difference plate. The phase difference plate may include one phase difference layer or two phase difference layers. In the case of two layers, it is sometimes called a first phase difference layer and a second phase difference layer to distinguish it. The polarizing plate and the phase difference plate are usually joined by an adhesive layer to form a circular polarizing plate. The circular polarizing plate can be combined with the adhesive layer to form the laminate for the organic EL display of the present invention, but it can also be combined with an optical compensation plate. Therefore, the laminate for the organic EL display of the present invention may include a circular polarizing plate and an adhesive layer; and the optical compensation plate is attached to the circular polarizing plate by another adhesive layer between the circular polarizing plate and the adhesive layer Become.

＜Polarizing plate＞ The polarizing plate includes a film having a function of light absorption anisotropy (hereinafter, sometimes referred to as a polarizing element). The polarizing element can be a stretched film with dichroic pigment adsorbed.

The stretched film that adsorbs the dichroic pigment, that is, the polarizing element is usually manufactured through the following steps: the step of uniaxially stretching the polyvinyl alcohol-based resin film; by dyeing the polyvinyl alcohol-based resin film with the dichroic pigment, The step of adsorbing the dichroic pigment; the step of treating the polyvinyl alcohol resin film with the dichroic pigment adsorbed by the boric acid aqueous solution; and the step of washing with water after the treatment with the boric acid aqueous solution.

The polyvinyl alcohol-based resin is 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, a copolymer of vinyl acetate and other monomers that can be copolymerized with it can also be used. Examples of other monomers that can be copolymerized with vinyl acetate include unsaturated carboxylic acid compounds, olefin compounds, vinyl ether compounds, unsaturated sulfonic acid compounds, and acrylamide compounds having an ammonium group.

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 resin may be modified, for example, polyvinyl formal or 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.

The film obtained by forming such polyvinyl alcohol resin can be used as a blank film of a polarizing film. The method of forming a polyvinyl alcohol-based resin into a film is not particularly limited, and the film can be formed by a known method. The film thickness of the polyvinyl alcohol-based green film can be, for example, about 10 to 150 μm.

The uniaxial stretching of the polyvinyl alcohol-based resin film may be performed before dyeing with dichroic pigments, or simultaneously with dyeing, or after dyeing. In the case of uniaxial stretching after dyeing, the uniaxial stretching may be performed before the boric acid treatment, or may be performed during the boric acid treatment. Moreover, it is also possible to perform uniaxial extension in these plural stages. In uniaxial stretching, it can be uniaxially stretched between rollers with different peripheral speeds, or it can be stretched uniaxially using heated rollers. In addition, the uniaxial stretching may be dry stretching in the atmosphere, or wet stretching in a state where the polyvinyl alcohol-based resin film is swelled using a solvent. The stretching ratio is usually about 3 to 8 times.

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

As the dichroic dye, specifically, iodine or a dichroic organic dye can be used. Examples of dichroic organic dyes include dichroic direct dyes containing bisazo compounds such as C. I. DIRECT RED 39, and dichroic direct dyes containing compounds such as trisazo and tetrasazo. The polyvinyl alcohol-based resin film is preferably subjected to an immersion treatment in water before the dyeing treatment.

When iodine is used as a dichroic dye, a method of immersing a polyvinyl alcohol-based resin film in an aqueous solution containing iodine and potassium iodide for dyeing is usually adopted. The content of iodine in the aqueous solution is usually about 0.01 to 1 part by mass per 100 parts by mass of water. In addition, the content of potassium iodide is usually about 0.5 to 20 parts by mass per 100 parts by mass of water. The temperature of the aqueous solution used for dyeing is usually about 20-40°C. In addition, the immersion time (dyeing time) in the aqueous solution is usually about 20 to 1,800 seconds.

On the other hand, when a dichroic organic dye is used as a dichroic dye, a method of immersing a polyvinyl alcohol-based resin film in an aqueous solution containing a water-soluble dichroic dye for dyeing is usually adopted. Regarding the content of the dichroic organic dye in the aqueous solution, per 100 parts by mass of water, it is usually about 1×10 ^-4 to 10 parts by mass, preferably 1×10 ^-3 to 1 part by mass, and more preferably 1×10 ^-3 ～1×10 ^-2 parts by mass. The aqueous solution may also contain inorganic salts such as sodium sulfate as a dyeing auxiliary. The temperature of the dichroic dye aqueous solution used for dyeing is usually about 20 to 80°C. In addition, the immersion time (dyeing time) in the aqueous solution is usually about 10 to 1,800 seconds.

The boric acid treatment after dyeing with a dichroic dye can usually be performed by immersing the dyed polyvinyl alcohol 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 per 100 parts by mass of water, preferably 5 to 12 parts by mass. In the case of using iodine as a dichroic pigment, it is preferable that the boric acid aqueous solution contains potassium iodide. Regarding the content of potassium iodide in this case, it is usually about 0.1-15 parts by mass per 100 parts by mass of water, preferably about 5 ~12 parts by mass. The 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.

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

After washing with water, a drying process was performed to obtain a polarizing element. The drying treatment 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 treatment time is usually about 60 to 600 seconds, preferably 120 to 600 seconds. Through the drying process, the moisture content of the polarizing element is reduced to a practical level. The moisture content is usually about 5 to 20% by weight, preferably 8 to 15% by weight. If the moisture content is less than 5% by weight, the flexibility of the polarizing element may be lost, and the polarizing element may be damaged or broken after drying. In addition, if the moisture content is higher than 20% by weight, the thermal stability of the polarizing element may deteriorate.

The thickness of the polarizing element obtained by uniaxially stretching the polyvinyl alcohol-based resin film, dyeing with a dichroic dye, boric acid treatment, water washing and drying is preferably 5-40 μm, more preferably 5-20 μm.

The polarizing plate of the present invention is obtained by laminating a protective film through an adhesive layer on only one side of the polarizing element obtained by the above-mentioned method or the like. The protective film is laminated on the opposite side of the polarizing element to the side on which the retardation plate is laminated. The adhesive layer is formed using a known adhesive composition.

＜Protective film＞ The protective film means a substrate with transparency that can transmit light (especially visible light). Transparency refers to the characteristic that the transmittance of light covering a wavelength of 380 to 780 nm is above 80%. Specific protective films include: polyolefins such as polyethylene and polypropylene; cycloolefin resins such as norene-based polymers; polyvinyl alcohol; polyethylene terephthalate; polymethacrylate; Acrylic esters; cellulose esters such as triacetyl cellulose, diacetyl cellulose, cellulose acetate propionate; polyethylene naphthalate; polycarbonate; polysulfide; polyether sulfonate; polyether ketone; polyphenylene Sulfide and polyphenylene ether, etc. From the viewpoint of availability or transparency, polyethylene terephthalate, polymethacrylate, cellulose ester, cycloolefin resin, or polycarbonate is preferred. One part or all of the hydroxyl groups contained in the cellulose ester-based cellulose are esterified and can be easily obtained from the market. Cellulose ester substrates can also be easily obtained from the market. Examples of commercially available cellulose ester substrates include "Fuji-TAC Film" (Fuji Photo Film (stock)); "KC8UX2M", "KC8UY", and "KC4UY" (KONICA MINOLTA OPTO (stock)).

The required characteristics of the protective film vary depending on the composition of the polarizing plate, but it is generally preferable to use a film with as little retardation as possible. As a film having as small a retardation as possible, cellulose ester films that do not have retardation such as Zero TAC (KONICA MINOLTA OPTO Co., Ltd.) and Z-TAC (Fuji Film Co., Ltd.) can be cited. Moreover, an unstretched cyclic olefin resin film is also preferable. As other preferable protective films, polyimide films, polyimide films, etc. can also be cited. Hard coating, anti-reflection, anti-static treatment, etc. can also be applied to the protective film surface of the unlaminated polarizer.

In the present invention, the resin forming the protective film may be, for example, cycloolefin, polyamide or gelatin compound with amide bond in the molecule, polyimide with amide bond in the molecule, and polyimide as its hydrolysate. Amino acid, polyvinyl alcohol, alkyl modified polyvinyl alcohol, polyacrylamide, polyazole, polyethyleneimine, polystyrene, polyvinylpyrrolidone, polyacrylic acid and polyacrylate. The protective film preferably has a transmittance of 10% or less at 400 nm. If the transmittance of 400 nm is 10% or less, it has the effect of suppressing the deterioration (discoloration) of the organic EL panel.

In terms of improving the strength or processability, the thickness of the protective film is usually 10 to 80 μm, preferably 20 to 60 μm, and more preferably 20 to 40 μm.

＜Phase difference plate＞ The retardation plate may be a stretched film that imparts a retardation by stretching a polymer, but from the viewpoint of thinning the laminate for the organic EL display of the present invention, it preferably contains a horizontal or vertical alignment The phase difference layer of the polymer of the polymerizable liquid crystal compound. When the retardation plate includes a retardation layer, it may be only the retardation layer, or may include the following alignment film or substrate.

When the phase difference plate only includes a phase difference layer of a polymer containing a polymerizable liquid crystal compound, it is preferable to satisfy all of the following formulas (1), (2) and (3): Re(450)/Re(550)≦1.00 (1) 1.00≦Re(650)/Re(550) (2) 100 nm≦Re(550)≦180 nm (3) (In the formula, Re(λ) represents the in-plane retardation value for light of wavelength λ nm) The retardation plate that satisfies the above formula (1) has so-called inverse 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, and preferably 0.80 or more, 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. Furthermore, Re(550) can be measured by the method described in the examples.

In the circular polarizer of the present invention, the angle formed by the slow axis of the retarder and the absorption axis of the polarizer is preferably substantially 45°. Furthermore, in the present invention, "essentially 45°" means 45°±5°.

The retardation plate includes a first retardation layer and a second retardation layer. When each retardation layer is a polymer retardation layer of a polymerizable liquid crystal compound, the first retardation layer preferably satisfies the following formula In relation to (4), the second retardation layer satisfies the relationship of the above formula (3), and the phase difference plate as a whole satisfies the relationship of the above formula (1) and (2). 200 nm≦Re(550)≦300 nm (4) (In the formula, Re(λ) represents the in-plane retardation value for light of wavelength λ nm)

The polymerizable liquid crystal compound (hereinafter, also referred to as "polymerizable liquid crystal compound (A)") that forms the retardation layer means 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 active radicals or acids generated from a photopolymerization initiator. Examples of photopolymerizable functional groups include vinyl groups, vinyloxy groups, 1-chlorovinyl groups, isopropenyl groups, 4-vinylphenyl groups, acryloxy groups, methacryloxy groups, and ethylene oxide. Group, oxetanyl, etc. Among them, propyleneoxy group, methacryloxy group, ethyleneoxy group, oxirane group and oxetanyl group are preferred, and propyleneoxy group is more preferred. The liquid crystallinity may be a thermotropic liquid crystal or a liquid crystal. As a phase order structure, it 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.

As the polymerizable liquid crystal compound (A), from the viewpoints of the ease of film formation and the imparting of retardation, compounds satisfying all of the following (1) to (4) can be cited.

(1) Compounds with thermotropic liquid crystallinity; (2) The polymerizable liquid crystal compound has π electrons in the major axis direction (a). (3) There are π electrons in the direction crossing the major axis direction (a) [crossing direction (b)]. (4) Let the total of π electrons existing in the long axis direction (a) be N(πa), and let the total of the molecular weights existing in the long axis direction (a) be N(Aa) and defined by the following formula (i) Π electron density in the long axis direction (a) of the polymerizable liquid crystal compound: D(πa)=N(πa)/N(Aa) (i) A polymerizable liquid crystal compound defined by the following formula (ii) with the total of π electrons present in the cross direction (b) as N(πb) and the total of the molecular weights present in the cross direction (b) as N(Ab) Π electron density in the cross direction (b): D(πb)=N(πb)/N(Ab) (ii) for 0≦[D(πa)/D(πb)]≦1 The relationship [that is, the π electron density in the cross direction (b) is greater than the π electron density in the long axis direction (a)]. Furthermore, the polymerizable liquid crystal compound (A) satisfying all of the above (1) to (4) can form a nematic phase by coating on an alignment film formed by rubbing treatment and heating to a phase transition temperature or higher. The nematic phase formed by the alignment of the polymerizable liquid crystal compound (A) is usually aligned such that the long axis directions of the polymerizable liquid crystal compound become parallel to each other, and the long axis direction becomes the alignment direction of the nematic phase.

所表示之化合物。上述式(I)所表示之化合物可單獨使用，或組合2種以上使用。The polymerizable liquid crystal compound (A) having the above-mentioned characteristics is usually one that exhibits reverse wavelength dispersion. As a compound satisfying the above-mentioned (1) to (4) characteristics, specifically, for example, the following formula (I) can be cited:

The compound represented. The compound represented by the above formula (I) can be used alone or in combination of two or more kinds.

In formula (I), Ar represents a divalent aromatic group which may have a substituent. The aromatic group here 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 law. Here, n represents an integer. When a ring structure is formed by including heteroatoms such as -N= or -S-, the non-covalent bond electron pairs on these heteroatoms satisfy Huckel's law, which also includes the aromaticity . In the divalent aromatic group, it is preferable to contain 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 substituted with a halogen atom, an alkyl group having 1 to 4 carbons, a fluoroalkyl group having 1 to 4 carbons, and The alkoxy group, cyano group or nitro group of 1 to 4, and the carbon atom 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 bivalent linking group.

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

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 the alkanediyl group contains -CH _2- It can be substituted 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 independent of each other, and preferably are 1,4-phenylene diyl groups which may be substituted with at least one substituent selected from the group consisting of halogen atoms and alkyl groups with 1 to 4 carbon atoms, 1,4-cyclohexanediyl substituted with at least one substituent selected from the group consisting of halogen atoms and alkyl groups with 1 to 4 carbon atoms, more preferably 1,4-cyclohexanediyl substituted with methyl Phenyldiyl, unsubstituted 1,4-phenylene diyl, or unsubstituted 1,4-trans-cyclohexanediyl, especially unsubstituted 1,4-phenylene Base or unsubstituted 1,4-trans-cyclohexanediyl. Also, it is preferable that at least one of the plural G ¹ and G ² is a divalent alicyclic hydrocarbon group, and it is more preferable that at least 1 of G ¹ and G ² bonded to L ¹ or L ² Those are divalent alicyclic hydrocarbon groups.

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 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 -), and more preferably -COO- or -COOCH ₂ CH ₂ -.

B ¹ and B ² are independent, preferably a single bond, alkylene 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, ^Ra9 to ^Ra16 each independently represent a single bond or an alkylene group having 1 to 4 carbon atoms. B ¹ and B ² are independent of each other, 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 and 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 expressing inverse wavelength dispersion, k and l are preferably in the range of 2≦k+1≦6, preferably k+1=4, and more preferably k=2 and l=2. If k=2 and l=2, it becomes a symmetrical structure, so it is more preferable.

E ¹ and E ² are independent of each other, and are preferably alkanediyl groups having 1 to 17 carbon atoms, more preferably alkanediyl groups 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, propyleneoxy group, Methacryloxy, oxirane, oxetanyl, etc. Among these, propyleneoxy group, methacryloxy group, ethyleneoxy group, oxirane group and oxetanyl group are preferred, and propyleneoxy group is more preferred.

Ar preferably has at least one selected from an aromatic hydrocarbon ring which may have a substituent, an aromatic heterocyclic ring which may have a substituent, and an electron withdrawing group. Examples of the aromatic hydrocarbon ring include a benzene ring, a naphthalene ring, and an anthracene ring, and a benzene ring and a naphthalene ring are preferred. Examples of the aromatic heterocyclic ring include furan ring, benzofuran ring, pyrrole ring, indole ring, thiophene ring, benzothiophene ring, pyridine ring, pyridine ring, pyrimidine ring, triazole ring, and triazole ring. , Pyrroline ring, imidazole ring, pyrazole ring, thiazole ring, benzothiazole ring, thienothiazole ring, azole ring, benzoazole ring and phenanthroline ring. 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. Furthermore, when Ar contains a nitrogen atom, 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, further preferably 14 or more, and particularly preferably 16 or more. Moreover, it is preferably 30 or less, more preferably 26 or less, and still more preferably 24 or less.

Examples of the aromatic group represented by Ar include groups of the following formulas (Ar-1) to (Ar-23).

In formulas (Ar-1) to (Ar-23), the * symbol represents the connecting portion, and Z ⁰ , Z ¹ and Z ² each independently represent a hydrogen atom, a halogen atom, an alkyl group with 1 to 12 carbon atoms, and a cyano group , Nitro, C1-C12 alkylsulfinyl group, C1-C12 alkylsulfinyl group, carboxyl group, C1-C12 fluoroalkyl group, C1-C6 alkoxy group , Alkylthio with 1-12 carbons, N-alkylamino with 1-12 carbons, N,N-dialkylamino with 2-12 carbons, N-alkyl with 1-12 carbons Sulfamoyl or N,N-dialkyl sulfamoyl with 2-12 carbon atoms.

Q ¹ and Q ² each independently represent ^{-CR 2 'R 3' -,} - S -, - NH -, - NR 2 '-, - CO- , or O-, R ^2' and R ^{3 'each} independently represent a hydrogen Atom or C1-C4 alkyl group.

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 a substituted aromatic hydrocarbon group or aromatic heterocyclic group.

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 0-6.

Examples of the aromatic hydrocarbon groups in Y ¹ , Y ² and Y ³ include aromatic hydrocarbon groups having 6 to 20 carbon atoms such as phenyl, naphthyl, anthryl, phenanthryl, and biphenyl. Preferred is phenyl, Naphthyl is more preferably phenyl. Examples of the aromatic heterocyclic group include furyl, pyrrolyl, thienyl, pyridyl, thiazolyl, benzothiazolyl, etc., containing at least one nitrogen atom, oxygen atom, sulfur atom, and other heteroatoms with 4 to 20 carbon atoms. The aromatic heterocyclic group is preferably furyl, thienyl, pyridyl, thiazolyl, and benzothiazolyl.

Y ¹ and Y ² may each independently be a substituted polycyclic aromatic hydrocarbon group or a polycyclic aromatic heterocyclic group. The polycyclic aromatic hydrocarbon group refers to a condensed polycyclic aromatic hydrocarbon group or a group derived from a group of aromatic rings. The polycyclic aromatic heterocyclic group refers to a condensed polycyclic aromatic heterocyclic group or a group derived from a group 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 carbons, a cyano group, a nitro group, an alkoxy group having 1 to 12 carbons, and Z ^{0 is more} preferably They are a hydrogen atom, an alkyl group having 1 to 12 carbon atoms, and 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 is preferably -NH -, - S -, - NR 2 '-, - O-, R 2' is preferably a hydrogen atom. Among them, -S-, -O-, and -NH- are particularly preferred.

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

In formulas (Ar-17) to (Ar-23), Y ¹ can form an aromatic heterocyclic group together with the nitrogen atom to which it is bonded and Z ⁰ . As the aromatic heterocyclic group, the aromatic heterocyclic ring that Ar may have can be mentioned above, but for example, a pyrrole ring, an imidazole ring, a pyrroline ring, a pyridine ring, a pyridine ring, a pyrimidine ring, and an indole ring are mentioned. , Quinoline ring, isoquinoline ring, purine ring, pyrrolidine ring, etc. The aromatic heterocyclic group may have a substituent. In addition, Y ¹ may form the above-mentioned substitutable polycyclic aromatic hydrocarbon group or polycyclic aromatic heterocyclic group together with the nitrogen atom to which it is bonded and Z ⁰ . For example, a benzofuran ring, a benzothiazole ring, a benzoxazole ring, etc. are mentioned. In addition, the compounds represented by the above formulas (Ar-1) to (Ar-23) can be produced, for example, according to the method described in JP 2010-31223 A.

The content of the polymerizable liquid crystal compound (A) in the polymerizable liquid crystal composition (A) constituting the retardation layer is, for example, 70-99.5 mass parts relative to 100 parts by mass of the solid content of the polymerizable liquid crystal composition (A) Parts, preferably 80 to 99 parts by mass, more preferably 90 to 98 parts by mass. If the content is within the above range, the orientation of the retardation plate tends to increase. Here, the solid content refers to the total amount of the components from the polymerizable liquid crystal composition (A) after removing the solvent and other volatile components.

The polymerizable liquid crystal composition (A) may also contain a polymerization initiator for starting the 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 composition (hereinafter, also referred to as a "composition for forming a retardation film") may be applied to a substrate or an alignment film, the solvent may be removed by drying, and heating and/or active energy rays may be used to make The polymerizable liquid crystal compound (A) in the obtained coating film is cured by curing the polymerizable liquid crystal compound (A) and optionally a polymerization initiator, additives, etc. (A) It is prepared by adding a solvent, mixing and stirring.

The substrate is preferably a substrate having transparency. The alignment film is one that aligns the polymerizable liquid crystal compound contained in the composition for forming a retardation film in any direction. The alignment film may be formed of an alignment polymer. In addition, the alignment film may also be an optical alignment film.

Examples of the alignment polymer include: polyamides or gelatins having amide bonds in the molecule, polyimines having amide bonds in the molecule, and polyamides and polyvinyl alcohols as hydrolysates thereof , Alkyl-modified polyvinyl alcohol, polyacrylamide, polyazole, polyethyleneimine, polystyrene, polyvinylpyrrolidone, polyacrylic acid and polyacrylate. Among them, polyvinyl alcohol is preferred. The aligning polymer can be used alone or in combination of two or more kinds.

The alignment film containing the alignment polymer is usually obtained by applying a composition obtained by dissolving the alignment polymer in a solvent (hereinafter, sometimes referred to as "aligning polymer composition") on a substrate and removing the solvent. Obtained; or obtained by coating the aligning polymer composition on the substrate, removing the solvent and rubbing (rubbing method). The solvent may be any solvent that can dissolve the components constituting the aligning polymer composition, for example, aliphatic hydrocarbons such as hexane and octane; aromatic hydrocarbons such as toluene and xylene; ethanol, 1-propanol, isopropanol, etc. Alcohols such as propanol and 1-butanol; ketones such as methyl ethyl ketone and methyl isobutyl ketone; esters such as ethyl acetate, butyl acetate and isobutyl acetate; ethylene glycol monomethyl ether, ethylene glycol Monoethyl ether, diethylene glycol monoethyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether and other glycol ethers; ethylene glycol monomethyl ether acetate, propylene glycol monomethyl ether acetate and other esterified glycol ethers are suitable Choose to use.

Regarding the concentration of the aligning polymer in the aligning polymer composition, as long as the aligning polymer material can be completely dissolved in the solvent, it is preferably 0.1-20% in terms of solid content relative to the solution. , More preferably about 0.1 to 10%.

As the alignment polymer composition, commercially available alignment film materials can also be used directly. Examples of commercially available alignment film materials include Sunever (registered trademark, manufactured by Nissan Chemical Industry Co., Ltd.), Optomer (registered trademark, manufactured by JSR (Stock)), and the like.

As a method of applying the aligning polymer composition to the substrate, examples include spin coating method, extrusion method, gravure coating method, die nozzle coating method, bar coating method, and dressing method. Method; or known methods such as printing method such as soft plate method.

As a method of removing the solvent contained in the aligning polymer composition, a natural drying method, a ventilation drying method, a heat drying method, a reduced pressure drying method, etc. can be cited.

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

As a method of imparting the alignment restriction force by the rubbing method, the following methods can be cited: winding a rubbing cloth, rotating a rubbing roller, and forming an alignment polymer composition on the substrate and annealing to form the substrate The alignment polymer film on the surface is in contact.

The photo-alignment film is usually formed by applying a composition containing a polymer or monomer having a photoreactive group and a solvent (hereinafter, also referred to as "the composition for forming a photo-alignment film") on a substrate and irradiating polarized light (more It is preferably obtained by polarizing UV (Ultraviolet). The optical alignment film can arbitrarily control the direction of the alignment restriction force by selecting the polarization direction of the irradiated polarization, which is better in this respect.

The photoreactive group refers to a group that generates liquid crystal alignment ability by light irradiation. Specifically, the groups involved in the alignment induction or isomerization reaction, dimerization reaction, photocrosslinking reaction, or photolysis reaction of molecules generated by light irradiation can be cited as the origin of the photoreaction of the liquid crystal alignment ability. Among them, the group participating in the dimerization reaction or the photocrosslinking reaction is preferable in terms of excellent alignment. The photoreactive group is preferably a group having an unsaturated bond, especially a double bond, and particularly preferably a group having a carbon-carbon double bond (C=C bond) and a carbon-nitrogen double bond (C=N bond) , Nitrogen-nitrogen double bond (N=N bond) and carbon-oxygen double bond (C=O bond) group consisting of at least one group.

Examples of the photoreactive group having a C=C bond include vinyl, polyalkenyl, stilbene, styrylpyridyl, styrylpyridinium, chalcone, and cinnamyl, etc. . Examples of the photoreactive group having a C=N bond include groups having structures such as aromatic Schiff bases and aromatic hydrazones. Examples of photoreactive groups having N=N bonds include: azophenyl, azonaphthyl, aromatic heterocyclic azo, bisazo, formazan, and those having an oxyazobenzene structure Base etc. Examples of the photoreactive group having a C=O bond include a benzophenone group, a coumarin group, an anthraquinone group, a maleimide group, and the like. These groups may also 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, and a halogenated alkyl group.

Among them, the photoreactive group that participates in the photodimerization reaction is preferred, and it is preferred in terms of relatively small amount of polarized light irradiation required for photoalignment and easy to obtain a photoalignment film excellent in thermal stability or stability over time It is cinnamon base and chalcone base. As a polymer having a photoreactive group, it is particularly preferable that the terminal portion of the side chain of the polymer has a cinnamyl group as a cinnamic acid structure.

By coating the composition for forming a photo-alignment film on a substrate, a photo-alignment layer can be formed on the substrate. Examples of the solvent contained in the composition include the same solvents exemplified above as the solvents that can be used in the composition for forming an alignment film. The solubility of the polymer or monomer having a photoreactive group can be seen And choose appropriately.

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 or the thickness of the target photo-alignment film. The mass of the composition is preferably set to at least 0.2% by mass, more preferably in the range of 0.3-10% by mass. The composition for forming the photo-alignment film may also contain polymer materials such as polyvinyl alcohol or polyimide, or a photosensitizer within the range that does not significantly impair the characteristics of the photo-alignment film.

As a method of applying the composition for forming a photo-alignment film to the substrate, the same method as the method of applying the aligning composition to the substrate can be cited. As a method of removing the solvent from the applied photo-alignment film-forming composition, for example, a natural drying method, an air drying method, a heat drying method, and a reduced-pressure drying method can be cited.

When irradiating the polarized light, the solvent may be removed from the composition for forming a photo-alignment film coated on the substrate, and then the polarized UV may be directly irradiated, or the polarized light may be irradiated from the substrate side to transmit the polarized light. Furthermore, it is particularly preferable if the polarized light is substantially parallel light. The wavelength of the irradiated polarized light may be in the wavelength region where the photoreactive group of the polymer or monomer having the photoreactive group can absorb light energy. Specifically, UV (ultraviolet rays) with a wavelength of 250 to 400 nm is particularly preferred. As the light source used for the polarized light irradiation, include: xenon lamp, high pressure mercury lamp, ultra-high pressure mercury lamp, metal halide lamp, KrF, ArF and other ultraviolet lasers, etc., more preferably high pressure mercury lamp, ultra high pressure mercury lamp and metal halide light. Among them, high-pressure mercury lamps, ultra-high-pressure mercury lamps, and metal halide lamps are preferable because of the higher luminous intensity of ultraviolet light with a wavelength of 313 nm. The light from the above-mentioned light source is irradiated through an appropriate polarizing element, thereby irradiating polarized UV. As the above-mentioned polarizing element, a polarizing filter or a polarizing element such as Gülen-Thompson or Gülen-Taylor or a wire grid type polarizing element can be used.

Furthermore, when rubbing or polarized light irradiation is performed, if shielding is performed, a plurality of regions (patterns) with different directions of liquid crystal alignment can also be formed.

The groove alignment film is a film having a concave-convex pattern or a plurality of 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 forming a concave-convex pattern after exposure through an exposure mask having a pattern-shaped slit on the surface of the photosensitive polyimide film, followed by development and washing treatment; A method of forming a layer of UV-curing resin before curing on a plate-shaped master with grooves on the surface, and moving the formed resin layer to the base material and hardening; and pressing the roller-shaped master with a plurality of grooves to form The UV hardening resin film before the hardening of the base material forms unevenness, and then hardening method.

The thickness of the alignment film (alignment film or photo-alignment film including an 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, and more preferably 10 to 200 nm, particularly preferably in the range of 50 to 150 nm.

As a method of applying the retardation film forming composition to a substrate, etc., spin coating method, extrusion method, gravure coating method, die nozzle coating method, bar coating method, dressing method, etc. can be cited Known methods such as printing methods such as coating method and soft plate method.

Next, 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, the solvent is removed by drying or the like to form a dry coating film. As the drying method, a natural drying method, a ventilation drying method, a heat drying method, and a reduced-pressure drying method, etc. may be mentioned.

Furthermore, in order to phase transition the polymerizable liquid crystal compound into the liquid phase, the temperature is raised to a temperature higher than the temperature at which the polymerizable liquid crystal compound phase transitions into the liquid phase, and then the temperature is lowered, so that the polymerizable liquid crystal compound phase transitions into the nematic phase. The above-mentioned phase transfer can be carried out after removing the solvent in the above-mentioned coating film, or can be carried out simultaneously with the removal of the solvent.

By polymerizing the polymerizable liquid crystal compound while maintaining the nematic liquid crystal state of the polymerizable liquid crystal compound, a retardation layer which is a hardened layer of the polymerizable liquid crystal composition is formed. As the polymerization method, a photopolymerization method is preferred. In photopolymerization, the light irradiated to the dry coating film depends on the type of photopolymerization initiator contained in the dry coating film and the type of polymerizable liquid crystal compound (especially the polymerizable liquid crystal compound possessed by the polymerizable liquid crystal compound). The type of base) and its amount are appropriately selected. As a specific example, one or more types of light or active electron beams selected from the group consisting of visible light, ultraviolet light, infrared light, X-ray, α-ray, β-ray, and γ-ray can be cited. Among them, in terms of easily controlling the progress of the polymerization reaction, or in terms of being used as a photopolymerization device for a wide range of users in the field, ultraviolet light is preferred, and the polymerizable liquid crystal composition is preferably selected in advance. The type of polymerizable liquid crystal compound or photopolymerization initiator can be photopolymerized by ultraviolet light. In addition, during polymerization, the dried coating film may be cooled by an appropriate cooling method, and the polymerization temperature may be controlled by light irradiation. If polymerization of the polymerizable liquid crystal compound is carried out at a lower temperature by adopting such a cooling method, even if a substrate having relatively low heat resistance is used, a polarizing plate can be appropriately formed. During photopolymerization, a patterned phase difference plate can also be obtained by masking or developing.

Examples of the light source of the above-mentioned active energy rays include: low pressure mercury lamp, medium pressure mercury lamp, high pressure mercury lamp, ultra high pressure mercury lamp, xenon lamp, halogen lamp, carbon arc lamp, tungsten filament lamp, gallium lamp, excimer laser, emission wavelength LED (Luminescent Diode, light-emitting diode) light source, chemical lamp, black light lamp, microwave excited mercury lamp, metal halide lamp with light ranging from 380 to 440 nm.

The intensity of ultraviolet radiation is usually 10 to 3,000 mW/cm ² . The intensity of ultraviolet irradiation is preferably the intensity of a wavelength region effective for activation of the photopolymerization initiator. The time for irradiating light is usually 0.1 second to 10 minutes, preferably 1 second to 5 minutes, more preferably 5 seconds to 3 minutes, and still more preferably 10 seconds to 1 minute. If irradiated with such ultraviolet irradiation intensity once or multiple times, the cumulative light intensity 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 depending on the display device to be 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 ~3 μm.

＜Optical compensation plate＞ The laminated body for the organic EL display of the present invention can be further combined with an optical compensation plate if necessary. The optical compensation plate has an optical function of compensating the viewing angle or color of the liquid crystal display device, and is preferably formed by aligning liquid crystal materials. The optical compensation plate is more preferably a polymer containing a polymerizable liquid crystal compound, and satisfies the following formula (5): -30 nm≦Rth(550)≦-100 nm (5) (Rth(550) represents the in-plane retardation in the film thickness direction when the irradiation wavelength is 550 nm) As a liquid crystal substance preferably used for such an optical compensation plate, a side chain type liquid crystal polymer compound can be cited. The side chain type liquid crystalline polymer compound is formed by allowing the liquid crystal layer to appear as the core unit, that is, the mesogen group as a side chain, which is bonded to the soft main chain via a soft chain, for example, polyacrylate or polymethacrylate , Polysiloxane, etc. as the main chain skeleton, if necessary, having a mesogen group as a side chain via a spacer containing a conjugated atomic group or the like. In addition, in order to control the tensile elastic modulus of the film, it is also possible to observe the end on the opposite side of the main chain from the mesogen group of the side chain, and optionally have oxetane through a spacer containing conjugated atomic groups. Polymeric functional groups such as epoxy groups, epoxy groups and vinyl ether groups 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 Polarizing Plate＞ The circular polarizing plate in the present invention includes a polarizing plate and a phase difference plate, and the polarizing plate includes a polarizing element and a protective film. The polarizing plate has a protective film on the side opposite to the retardation plate.

In the above-mentioned circular polarizing plate, the polarizing plate and the retardation plate may be laminated through an adhesive layer, or may be laminated through an adhesive layer, preferably through an adhesive layer. That is, the above-mentioned circular polarizing plate preferably has a structure in which a polarizing plate, an adhesive layer, and a phase difference plate are laminated in this order.

As the adhesive layer for laminating the polarizing plate and the retardation plate, an adhesive layer having a transmittance of 10% or less at a wavelength of 400 nm (hereinafter, sometimes referred to as a near-infrared absorbing adhesive layer) is preferred.

The adhesive composition for forming the adhesive layer in which the polarizing plate and the retardation plate are laminated is not particularly limited, and a known adhesive composition can be used.

The adhesive composition for forming the near-infrared absorbing adhesive layer is not particularly limited. For example, the adhesive composition described in Japanese Patent Laid-Open No. 2017-119700 can be cited, and preferably contains a selective absorption wavelength around 400 nm ( For example, the adhesive composition of the compound of light with 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 water vapor transmission rate of the circular polarizing plate in the present invention is 100 g/m ² /24 hrs or less and the light transmission rate of 380 nm is 1% or less. Thereby, an organic EL display with excellent display characteristics, flexibility, and deterioration over the years is obtained.

The water vapor transmission rate is measured in accordance with JIS Z 0208 under the conditions of 40°C and 90% relative humidity, and calculated as the amount of water that passes through the membrane within 24 hours per 1 m ² of the membrane area. If the water vapor transmission rate exceeds 100 g/m ² /24 hrs, the durability of the obtained organic EL display will deteriorate. The water vapor transmission rate is preferably 60 g/m ² /24 hrs or less, more preferably 30 g/m ² /24 hrs or less, still more preferably 10 g/m ² /24 hrs or less, and can also be less than the measurement limit The lower water vapor transmission rate.

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

In the above circular polarizing plate, the oxygen transmittance is preferably 30 cc/atm/m ² /24 hrs or less. The oxygen permeability is based on JIS K 7126 and is measured with an oxygen permeability measuring device (OX-TRANML, manufactured by MOCON) at 23° C. and a relative humidity of 50%. In terms of further improving the durability of the organic EL display, the oxygen permeability is more preferably 20 cc/atm/m ² /24 hrs or less, and more preferably 10 cc/atm/m ² /24 hrs or less.

＜Adhesive layer (1)＞ In the present invention, as the adhesive composition for forming the adhesive layer laminated with the circular polarizing plate (in this specification, the adhesive layer is sometimes referred to as "adhesive layer (1)"), it is not particularly limited For example, suitable adhesives such as acrylic or silicone, polyester, polyurethane, polyamide, polyether, and rubber can be used. Among them, in terms of optical transparency, adhesive properties, and weather resistance, pressure-sensitive acrylic adhesives are preferred. The adhesive layer (1) is usually laminated on the phase difference plate of the circular polarizer. The adhesive layer (1) can be laminated on the opposite side of the circularly polarizing plate, and another layer (separation film, etc.) can be laminated.

Furthermore, for the adhesive layer (1) and the adhesive layer used for the laminate of the polarizing plate and the retardation plate, various diffusing agents can be dispersed to impart diffusibility, or various conductive materials can be mixed to impart antistatic properties, etc., Make it functional depending on the purpose.

From the viewpoint of flexibility or visibility of the display device, the thickness of the laminate formed by laminating the circular polarizing plate and the adhesive in the present invention 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 device (SED)), electronic paper (display device using electronic ink or electrophoresis element), plasma display device, projection display device (grid light valve imaging system (GLV) display device, with digital micro Mirror device (DMD) display device, etc.) and piezoelectric ceramic display, etc. The liquid crystal display device also includes any of a transmissive liquid crystal display device, a semi-transmissive liquid crystal display device, a reflective liquid crystal display device, a direct-view liquid crystal display device, and a projection liquid crystal display device. The display devices can be display devices that display two-dimensional images, or 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 further detail with examples and comparative examples. The "%" and "parts" in the examples and comparative examples mean "mass %" and "parts by mass" unless otherwise stated.

[Example 1] ＜Production of polarizing plate＞ [Polarizer: Manufacture of iodine PVA type polarizer] A polyvinyl alcohol film with a thickness of 30 μm (PVA: average degree of polymerization is about 2400, saponification degree of 99.9 mol% or more) is uniaxially stretched to about 5 times by dry stretching, and then immersed in 40% while maintaining the stretched state. 40 seconds in pure water at ℃. After that, it was immersed in a dyeing aqueous solution with a mass ratio of iodine/potassium iodide/water of 0.044/5.7/100 at 28°C for 30 seconds to perform dyeing treatment. Next, immerse in a boric acid aqueous solution with a mass ratio of potassium iodide/boric acid/water of 11.0/6.2/100 at 70°C for 120 seconds. Then, it was washed with pure water at 8°C for 15 seconds, and dried at 60°C for 50 seconds under a tension of 300 N, followed by drying at 75°C for 20 seconds to obtain the iodine adsorption orientation on polyethylene Polarizing element with an alcohol film thickness of 12 μm.

A water-based adhesive was injected between the obtained polarizing element and the cycloolefin film (ZF14 manufactured by Nippon Zeon Co., Ltd.), and bonded by a nip roller. While maintaining the tension of the obtained laminate at 430 N/m, it was dried at 60°C for 2 minutes to obtain a polarizing plate I having a cycloolefin film (COP) on one side as a protective film. Furthermore, the above-mentioned water-based adhesive is to add 3 parts of carboxyl modified polyvinyl alcohol (KURARAY-POVAL KL318; manufactured by Kuraray Co., Ltd.) and 1.5 parts of water-soluble polyamide epoxy resin (Sumirez Resin650) to 100 parts of water. ; Sumika Chemtex Co., Ltd., a solid content concentration of 30% aqueous solution).

<Production of retardation plate> [Preparation of composition for forming photo-alignment film] 5 parts of the following photo-alignment material described in JP 2013-033249 A and 95 parts of cyclopentanone (solvent) were added The mixture was mixed, and the obtained mixture was stirred at 80° C. for 1 hour, thereby obtaining a composition for forming a photo-alignment film. (Optical Alignment Material)

[Preparation of polymerizable liquid crystal composition] The polymerizable liquid crystal compound A-1 (86.0 parts), the polymerizable liquid crystal compound A-2 (14.0 parts), and the polyacrylate compound (leveling agent/BYK-361N; manufactured by BYK-Chemie) (0.12 Parts) and 2-dimethylamino-2-benzyl-1-(4-𠰌olinylphenyl)butan-1-one (photopolymerization initiator/Irgacure369; manufactured by Ciba Specialty Chemicals) (3.0 parts ) Is mixed to obtain a polymerizable liquid crystal composition (A1) containing a polymerizable liquid crystal compound A-1 and a polymerizable liquid crystal compound A-2.

Polymeric liquid crystal compound A-1:

Polymeric liquid crystal compound A-2:

[Production of retardation plate] Using a corona treatment device (AGF-B10; manufactured by Kasuga Electric Co., Ltd.), the cycloolefin polymer film (COP; ZF-14) was used at an output of 0.3 kW and a processing speed of 3 m/min. ; Nippon Zeon Co., Ltd.) treated once. The above-mentioned photo-alignment film forming composition was bar-coated on the corona-treated surface, dried at 80°C for 1 minute, and polarized UV irradiation device (SPOT CURE SP-7 with polarizing element unit; Ushio Co., Ltd. (Manufactured by the company) with a cumulative light quantity of 100 mJ/cm ^{2 to} perform polarization UV exposure to form an alignment film. The thickness of the obtained alignment film was measured by Ellipsometer M-220 (manufactured by JASCO Corporation), and the result was 100 nm.

Then, the wire of the bar coater was set to #30, and the previously prepared polymerizable liquid crystal composition (A1) containing polymerizable liquid crystal compound was coated on the alignment film at a speed of 50 mm/sec. Dry at ℃ for 1 minute. Thereafter, a high-pressure mercury lamp (UNICURE VB-15201BY-A; manufactured by Ushio Co., Ltd.) was used to irradiate the polymerizable liquid crystal composition (A1) from the side of the surface coated with the polymerizable liquid crystal composition (A1) (in a nitrogen atmosphere, the cumulative light intensity at a wavelength of 313 nm: 500 mJ/cm ² ) ultraviolet rays to form 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 Co., Ltd.) and the result was 2.3 μm. The retardation value at the wavelength of 550 nm of the obtained retardation layer was measured, and the result was Re(550)=140 nm. In addition, the retardation value at a wavelength of 450 nm and a wavelength of 650 nm of the obtained retardation layer was measured, and the result was Re(450)/Re(550)=0.85 and Re(650)/Re(550)=1.05.

＜Production of circular polarizing plate＞ Use an adhesive (manufactured by LINTEC Co., Ltd., acrylic adhesive) so that the angle (θ) formed by the absorption axis of the polarizer I and the retardation axis of the retardation plate B becomes 45° After bonding with the agent (colorless and transparent, no alignment), the cycloolefin polymer film of the retardation plate was peeled off, and the circular polarizing plate 1 was produced.

＜Production of laminated body for organic EL display＞ An acrylic adhesive (manufactured by LINTEC Co., Ltd., film thickness 15 μm) was laminated on the phase difference plate of the obtained circular polarizing plate to obtain a laminate for organic EL displays. Table 1 summarizes the layer structure of the obtained laminate for organic EL displays.

<Measurement of water vapor transmission rate> For the obtained circular polarizing plate, it was measured in accordance with JIS Z 0208 at 40°C and a relative humidity of 90%, and the film was passed through the film within 24 hours per 1 m ² area Calculated in the form of the amount of water. The results are shown in Table 2.

＜Measurement of oxygen permeability＞ With respect to the obtained circular polarizing plate, it was measured based on JIS K7126 using an oxygen transmission rate measuring device (OX-TRANML, manufactured by MOCON) under conditions of 23° C. and relative humidity of 50%. The results are shown in Table 2.

＜Determination of transmittance＞ With respect to the obtained circular polarizing plate, the transmittance of 380 nm and 400 nm was measured using a spectrophotometer (UV-3150; manufactured by Shimadzu Corporation). The results are shown in Table 2.

＜Weather resistance test＞ The obtained acrylic adhesive of the laminate for organic EL displays was bonded to the display device obtained by removing the front glass and polarizing plate of the "Galaxy S5" manufactured by SAMSUNG. Check the reflection hue when the power of the display device is set to OFF (during black display) and ON (during white display). Table 3 shows the results of the initial appearance and the appearance after a 100-hour accelerated weather resistance test (100-hour accelerated weather resistance test) using a daylight weathering machine. Furthermore, the front reflection hue ("white display" and "black display" in Table 3) is the hue obtained by visually observing the sample at a distance of 50 cm from the front, and oblique reflection hue (in Table 3 is "oblique black Display") is the hue when observed visually at a distance of 50 cm from an elevation angle of 60° and an azimuth angle of 0 to 360°.

＜Flexibility test＞ Place a glass plate with a thickness of 0.7 mm on the coating side of the obtained circular polarizer and attach it to the glass plate. After bending the laminate by 180 degrees, use a 10x magnifying glass to transmit the light of the fluorescent lamp and observe Check the flexible part for wrinkles or cracks. Let A where no wrinkles or cracks are observed, B where a wrinkle is slightly confirmed, and C where wrinkles and cracks are observed. The results are shown in Table 3.

[Example 2] The adhesive of the polarizing plate and the retardation plate in Example 1 was changed to the adhesive described in Example 2 of Japanese Patent Application Publication Gazette and Japanese Patent Laid-Open No. 2017-120430 (near ultraviolet PSA (Polymer sustained alignment, polymer sustained alignment) Stable alignment)). Except for this, it was produced in the same manner as in Example 1.

[Example 3] [Production of phase difference plate] <Preparation of aligning polymer composition (1)> Water was added to commercially available polyvinyl alcohol (polyvinyl alcohol 1000 fully saponified type, manufactured by Wako Pure Chemical Industries Co., Ltd.), and heated at 100°C for 1 hour to obtain an aligning polymer composition (1). The solid content in the alignment polymer composition (1) was 2% by mass.

<Preparation of composition (B-1)> The polymerizable liquid crystal compound represented by the formula (LC242), polymerization initiator (manufactured by BASF; Irgacure907), and polyacrylate compound (leveling agent/BYK-361N; BYK) -Chemie), reaction additives (Laromer (registered trademark) LR-900 manufactured by BASF), and propylene glycol 1-monomethyl ether 2-acetate (PGMEA) were mixed to obtain a composition (B-1). Furthermore, the ratio of each compound in the composition (B-1) is 19.2% by mass of polymerizable liquid crystal compound, 0.5% by mass of polymerization initiator, 0.1% by mass of leveling agent, 1.1% by mass of reaction additive, and 79.1% of PGMEA.

<Preparation of Retardation Layer 1> The oriented polymer composition (1) is applied to a saponified triacetyl cellulose film (hereinafter, sometimes referred to as TAC), and then heated and dried to obtain an orientation with a thickness of 80 nm性polymer film. Rubbing treatment is performed on the surface of the obtained alignment polymer film. Then, the composition (B-1) was applied using a bar coater, dried at 100°C for 1 minute, and then irradiated using a high-pressure mercury lamp (under nitrogen atmosphere, cumulative light intensity at a wavelength of 365 nm: 1200 mJ/cm ² ) Ultraviolet rays, thereby forming the retardation layer 1. The film thickness of the obtained retardation layer 1 was measured with a laser microscope, and the film thickness was 1.94 μm. The retardation value of the obtained retardation layer 1 was measured, and the result was Re(550)=269 nm. In addition, the retardation value of the wavelength 450 nm and the wavelength 650 nm was measured, and the result was Re(450)/Re(550)=1.08 and Re(650)/Re(550)=0.99.

<Production of Retardation Layer 2> The oriented polymer composition (1) is coated on a saponified triacetyl cellulose film (KC4UY manufactured by Konica Minolta Co., Ltd.) and heated and dried to obtain a thickness of 82 nm Alignment polymer film. The surface of the oriented polymer film obtained was rubbed at an angle of 15° to the longitudinal direction of the TAC, and then the composition (B-1) was coated with a bar coater and dried at 100°C for 1 Minutes later, a high-pressure mercury lamp was used to irradiate (accumulated light intensity at 365 nm in a nitrogen atmosphere: 1200 mJ/cm ² ) ultraviolet light to form the retardation layer 2. The film thickness of the obtained retardation layer 2 was measured by a laser microscope. As a result, the film thickness was 973 nm. The retardation value of the obtained retardation layer 2 was measured, and the result was Re(550)=135 nm. In addition, the retardation value of the wavelength 450 nm and the wavelength 650 nm was measured, and the result was Re(450)/Re(550)=1.07 and Re(650)/Re(550)=0.98.

<Lamination of retardation layer 1 and retardation layer 2> The retardation layer 1 obtained above and the retardation axis of the retardation layer 2 are bonded together using a photocurable adhesive so that the angle of the retardation axis of the retardation layer 2 becomes 60° to produce the retardation plate 3.

＜Production of circular polarizing plate＞ The angle (θ) between the retardation layer 1 side of the retardation plate 3 and the polarizing plate I with the absorption axis of the polarizing plate I and the retardation axis of the retardation layer 1 is 15°, and the absorption axis and the phase of the polarizing plate I After bonding with an adhesive so that the angle (θ) formed by the late axis of the retardation plate 2 becomes 75°, the cycloolefin polymer film of the retardation plate is peeled off to produce a circular polarizing plate.

＜Production of laminated body for organic EL display＞ Except having used the phase difference 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 aligning polymer composition (2)> 2-Butoxyethanol was added to a commercially available alignment polymer, namely Sunever SE-610 (manufactured by Nissan Chemical Industry Co., Ltd.), to obtain an alignment polymer composition (2). Furthermore, the solid content of the aligning polymer composition (2) was 1% by mass.

Use a corona treatment device to treat the surface of the cycloolefin film once at an output of 0.3 kW and a processing speed of 3 m/min. Using a bar coater, the alignment polymer composition (2) was coated on the corona-treated surface, and dried at 90° C. for 1 minute to obtain an alignment film. The film thickness of the obtained alignment film was measured by a laser microscope, and the result was 34 nm. Then, use a bar coater to coat the composition (B-1) on the alignment film, dry at 90°C for 1 minute, and irradiate it with a high-pressure mercury lamp (under nitrogen atmosphere, cumulative light intensity at a wavelength of 365 nm: 1000 mJ/cm ² ) ultraviolet rays, 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, the phase difference value at a wavelength of 550 nm of the obtained optical compensation plate was measured, and the result was Re(550)=1 nm and Rth(550)=-70 nm. Furthermore, the retardation value of the cycloolefin film alone at a wavelength of 550 nm is approximately zero.

The circular polarizing plate produced in Example 1 and the optical compensation plate obtained above were bonded together using the acrylic adhesive described in Example 1 to obtain a circular polarizing plate with an optical compensation plate. An acrylic adhesive was further laminated on the optical compensation plate of the obtained circular polarizing plate with optical compensation plate to obtain a laminate for organic EL displays.

[Example 5] A 30 μm polyimide film (PI film) was produced by the same method as in Example 1 described in International Publication No. 2017/014279. Except having used the above-mentioned polyimide-based film (PI film) instead of the cycloolefin polymer film as the protective film, it was produced in the same manner as in Example 2.

[Example 6] A 30 μm polyimide film (PI film) was produced by the same method as in Example 1 described in International Publication No. 2017/014279. Except having used the above-mentioned polyimide-based film as a protective film, it was produced in the same manner as in Example 3.

[Example 7] A 30 μm polyimide film (PI film) was produced by the same method as in Example 1 described in International Publication No. 2017/014279. The above-mentioned polyimide-based film was used as a protective film, and the adhesive used for the laminate of the retardation plate and the polarizing plate was set to the acrylic adhesive described in Example 1. The procedure was carried out in the same manner as in Example 4, except that Make.

[Comparative Example 1] ＜Production of polarizing plate＞ Arrange triacetyl cellulose films (TAC; KC2UA; manufactured by Konica Minolta Co., Ltd.) on both sides of the polarizing element, inject water-based adhesives between the layers, and bond them with nip rollers. While maintaining the tension of the obtained laminate at 430 N/m, while drying at 60°C for 2 minutes, a polarizing plate with triacetyl cellulose films as protective films on both sides was obtained. Furthermore, the above-mentioned water-based adhesive is to add 3 parts of carboxyl modified polyvinyl alcohol (KURARAY-POVAL KL318; manufactured by Kuraray Co., Ltd.) and 1.5 parts of water-soluble polyamide epoxy resin (Sumirez Resin650) to 100 parts of water. ; Sumika Chemtex Co., Ltd., a solid content concentration of 30% aqueous solution).

＜Production of laminated body for organic EL display＞ Except having used a polycarbonate copolymer resin film (WRS-143; manufactured by Teijin Corporation) as a phase difference plate, it carried out similarly to Example 1, and produced the laminated body for organic electroluminescent displays.

[Comparative Example 2] Except having used the phase difference plate 2 produced in Example 3, it carried out similarly to the comparative example 1, and produced the laminated body for organic electroluminescent 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 electroluminescent displays.

[Table 1] constitute Polarizer Adhesive Phase difference plate Adhesive Optical compensation plate Adhesive thickness Protective film 1 Polarizing element Protective film 2 Retardation layer 1 Retardation layer 2 Re(550) α β Re(550) α β Rth(550) Comparative example 1 TAC (25 μm) PVA (12 μm) TAC (25 μm) PSA 15 μm 140 nm 0.92 1.02 - - - PSA 15 μm - - 142 μm Comparative example 2 TAC (25 μm) PVA (12 μm) TAC (25 μm) PSA 15 μm 135 nm 1.08 0.99 - - - PSA 15 μm - - 93 μm Comparative example 3 TAC (25 μm) PVA (12 μm) TAC (25 μm) PSA 15 μm 140 nm 0.85 1.05 - - - PSA 15 μm - - 94 μm Example 1 COP (25 μm) PVA (12 μm) - PSA 15 μm 140 nm 0.85 1.05 - - - PSA 15 μm - - 69 μm Example 2 COP (25 μm) PVA (12 μm) - Near UV PSA 15 μm 140 nm 0.85 1.05 - - - PSA 15 μm - - 69 μm Example 3 COP (25 μm) PVA (12 μm) - Near UV PSA 15 μm 269 nm 1.08 0.99 135 nm 1.07 0.98 PSA 15 μm - - 72 μm Example 4 COP (25 μm) PVA (12 μm) - Near UV PSA 15 μm 140 nm 0.85 1.05 - - - PSA 15 μm -70 nm PSA 15 μm 85 μm Example 5 PI film (30 μm) PVA (12 μm) - PSA 15 μm 140 nm 0.85 1.05 - - - PSA 15 μm - - 74 μm Example 6 PI film (30 μm) PVA (12 μm) - PSA 15 μm 269 nm 1.08 0.99 135 nm 1.07 0.98 PSA 15 μm - - 77 μm Example 7 PI film (30 μm) PVA (12 μm) - PSA 15 μm 140 nm 0.85 1.05 - - - PSA 15 μm -70 nm PSA 15 μm 90 μm In addition, "COP" in Table 1 means cyclic olefin film, "PI" means polyimide, "TAC" means triacetyl cellulose film, "PVA" means polyvinyl alcohol, and "PSA" means acrylic adhesive Agent. 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] constitute Oxygen permeability Water vapor transmission rate 380 nm transmittance 400 nm transmittance Comparative example 1 5 or less 700 g/m ² /24 hrs 3% 32% Comparative example 2 5 or less 700 g/m ² /24 hrs 18% 38% Comparative example 3 5 or less 700 g/m ² /24 hrs ＜0.1% twenty three% Example 1 5 or less 3 g/m ² /24 hrs ＜0.1% twenty three% Example 2 5 or less 3 g/m ² /24 hrs ＜0.1% ＜0.1% Example 3 5 or less 3 g/m ² /24 hrs ＜0.1% ＜0.1% Example 4 5 or less 3 g/m ² /24 hrs ＜0.1% ＜0.1% Example 5 5 or less 60 g/m ² /24 hrs ＜0.1% ＜0.1% Example 6 5 or less 60 g/m ² /24 hrs ＜0.1% ＜0.1% Example 7 5 or less 60 g/m ² /24 hrs ＜0.1% ＜0.1%

[table 3] constitute Initial appearance Appearance after 100 hours of accelerated weather resistance test Flexibility test White display Black display Oblique black display White display Black display Comparative example 1 white black Black red ~ black blue Red (large change) black C Comparative example 2 white purple Blue to red Red (large change) purple B Comparative example 3 white black Black red ~ black blue Peach (variation) black B Example 1 white black Black red ~ black blue Light peach color (slightly changed) black A Example 2 white black Black red ~ black White (no change) black A Example 3 white black Black red ~ black green White (no change) black A Example 4 white black black White (no change) black A Example 5 white black Black red ~ black White (no change) black A Example 6 white black Black red ~ black green White (no change) black A Example 7 white black black White (no change) black B

From the results in Table 2 and Table 3 above, it can be seen that in Examples 1 to 7 meeting the necessary conditions of the present invention, the appearance after the 100-hour accelerated weather resistance test hardly changed from the initial appearance, and the flexibility was maintained at the original level. performance. In Comparative Examples 1 to 3, the appearance after the 100-hour accelerated weather resistance test changed from the initial appearance. In particular, the water vapor transmission rate in the comparative example is 700 g/m ² /24 hrs, which greatly deviates from the reference value of 100 g/m ² /24 hrs, so it is understood that the weather resistance is deteriorated.

Claims (16)

A laminate for an organic EL display, which is a laminate formed by laminating a circular polarizing plate and an adhesive, and the thickness of the laminate is 100 μm or less. The circular polarizing plate includes a polarizing plate and a phase difference plate, and the polarizing plate includes The polarizing element and the protective film, and the protective film is provided only on the opposite side of the surface where the polarizing element is laminated with the phase difference plate, the water vapor transmission rate of the circular polarizing plate is 100 g/m ² /24 hrs or less, and the circular polarizing light The 380 nm transmittance of the plate is below 1%. The laminate for an organic EL display according to claim 1, wherein the polarizing element is formed of a polyvinyl alcohol-based resin film. The laminated body for organic EL display of claim 1 or 2, wherein the 400 nm transmittance of the circular polarizing plate is 1% or less. The laminate for organic EL displays according to any one of claims 1 to 3, wherein the phase difference plate includes only one phase difference layer of a polymer containing a polymerizable liquid crystal compound, and satisfies the following formula (1), All of formula (2) and formula (3); Re(450)/Re(550)≦1.00 (1) 1.00≦Re(650)/Re(550) (2) 100 nm≦Re(550)≦180 nm (3) (In the formula, Re(λ) represents the in-plane retardation value for light of wavelength λ nm). The organic EL display laminate of claim 4, wherein the angle formed by the slow axis of the retardation plate and the absorption axis of the polarizer is substantially 45 degrees. The laminate for an organic EL display according to any one of claims 1 to 3, wherein the phase difference plate includes a first phase difference layer and a second phase difference layer in order from the polarizing plate side, and The first retardation layer and the second retardation layer are polymers of polymerizable liquid crystal compounds, respectively, The first retardation layer satisfies the relationship of the following formula (4), The second retardation layer satisfies the relationship of formula (3), The phase difference plate satisfies the relationship between formula (1) and formula (2); Re(450)/Re(550)≦1.00 (1) 1.00≦Re(650)/Re(550) (2) 100 nm≦Re(550)≦180 nm (3) 200 nm≦Re(550)≦300 nm (4) (In the formula, Re(λ) represents the in-plane retardation value for light of wavelength λ nm). The laminate for organic EL displays according to any one of claims 1 to 6, which further has an optical compensation plate of a polymer containing a polymerizable liquid crystal compound satisfying the following formula (5); -30 nm≦Rth(550)≦-100 nm (5) (Rth(550) represents the in-plane phase difference in the thickness direction of the light with a wavelength of 550 nm). The laminate for organic EL displays according to any one of claims 1 to 6, wherein the circular polarizing plate includes an adhesive layer with a transmittance of 10% or less at 400 nm. The laminate for organic EL displays according to any one of claims 1 to 7, wherein the protective film is a cycloolefin film. The laminate for organic EL displays according to any one of claims 1 to 7, wherein the protective film is a polyimide film or a polyimide imide film. A circular polarizing plate, which is formed by laminating at least a polarizing plate, an adhesive layer and a retardation plate in this order, and the polarizing plate includes a polarizing element and a protective film, and only the polarizing element is laminated with a retardation plate There is a protective film on the opposite side of the surface, the retardation plate satisfies the relationship of formula (1) and formula (2), the water vapor transmission rate of the circular polarizing plate is 100 g/m ² /24 hrs or less, and the circular polarizing plate The 380 nm transmittance is less than 1%; Re(450)/Re(550)≦1.00 (1) 1.00≦Re(650)/Re(550) (2). The circular polarizing plate of claim 11, wherein the polarizing element is formed of a polyvinyl alcohol-based resin film. Such as the circular polarizing plate of claim 11 or 12, wherein the 400 nm transmittance of the circular polarizing plate is less than 1%. The circular polarizing plate of any one of claims 11 to 13, wherein the 400 nm transmittance of the adhesive layer is 10% or less. The circular polarizing plate according to any one of claims 11 to 14, wherein the protective film is a cycloolefin film. The circular polarizing plate according to any one of claims 11 to 15, wherein the protective film is a polyimide film or a polyimide film.