TW201807128A - Optical film for organic el display devices, polarizing film for organic el display devices, polarizing film with adhesive layer for organic el display devices, and organic el display device - Google Patents

Abstract

The present invention is an optical film for organic EL display devices, which is characterized by comprising: a retardation film that functions as a [lambda]/4 plate; and an adhesive layer that has a water vapor permeability of 50 g/(m2.day) or less at 40 DEG C at 92% RH. This optical film for organic EL display devices according to the present invention has more excellently low water vapor permeability without forming a barrier layer which is composed of an inorganic material and is formed by vapor deposition or the like.

Description

Optical film for organic EL display device, polarizing film for organic EL display device, polarizing film with adhesive layer for organic EL display device, and organic EL display device

FIELD OF THE INVENTION The present invention relates to an optical film for an organic EL display device. The present invention also relates to a polarizing film for an organic EL display device including a polarizer and the optical film for an organic EL display device, and an attachment for an organic EL display device further including an adhesive layer on the polarizing film for an organic EL display device. Polarizing film of adhesive layer. The present invention also relates to an organic EL display device using the polarizing film for an organic EL display device or the polarizing film with an adhesive layer for an organic EL display device.

BACKGROUND OF THE INVENTION In recent years, organic EL display devices (OLEDs) equipped with organic EL (Electro Luminescence) panels have been widely used in various applications such as mobile phones, car navigation devices, monitors for personal computers, and televisions. In general, in order to prevent external light from being reflected by a metal electrode (cathode), the organic EL display device looks like a mirror surface, and a circular polarizer is arranged on the viewing side surface of the organic EL panel. The constituent members of the organic EL display device such as the circular polarizing plate are usually laminated with a bonding material such as an adhesive layer or an adhesive layer.

The aforementioned circular polarizing plate generally uses a laminated body of a polarizing plate and a λ / 4 plate. For example, a polarizer and a two-layer retardation layer having specific refractive index characteristics are known (see Patent Document 1).

The organic EL element mounted on the aforementioned organic EL display device is very inferior to moisture and oxygen in the atmosphere. Therefore, a barrier layer or an optical film having a barrier function is usually provided on the surface of the organic EL panel, and low moisture permeability is also required, that is, Moisture and the like do not penetrate through the optical film constituting the organic EL display device or the adhesive layer used to adhere to them.

In particular, among the flexible display devices in recent years, flexible organic EL display devices have attracted much attention. In a flexible organic EL display device, a thin film is used instead of glass. However, as mentioned above, organic EL elements are very inferior to moisture and oxygen in the atmosphere. If the outermost layer is changed from glass with excellent low moisture permeability to a thin film, the organic EL element is suspected of being damaged. The optical film and the adhesive layer of the EL display device further strive for a high degree of low moisture permeability. Prior Art Literature Patent Literature

Patent Document 1: Japanese Patent No. 5528606

SUMMARY OF THE INVENTION Problems to be Solved by the Invention Patent Document 1 provides a polarizing plate with a retardation layer capable of suppressing changes in viewing angle characteristics and display characteristics. However, there is no discussion on providing low moisture permeability to optical films such as retardation films.

As a method for imparting low moisture permeability to an optical film, for example, a barrier layer can be deposited on a retardation film (λ / 4 plate) constituting a circular polarizing plate (anti-reflective film) used in an organic EL display device. However, from the viewpoint of cost, the method of vapor-depositing the barrier film on the retardation film is not perfect, and when the barrier film is vapor-deposited on the retardation film, the retardation film is heated, which may cause the retardation film to break or change the phase. The difference is not enough.

Therefore, an object of the present invention is to provide an optical film for an organic EL display device that does not need to form a barrier layer made of an inorganic substance formed by evaporation or the like and has a low moisture permeability. Another object of the present invention is to provide a polarizing film for an organic EL display device including a polarizer and the optical film for an organic EL display device, and an organic EL display device having the polarizing film and an adhesive layer for the organic EL display device. Polarizing film with adhesive layer. Another object of the present invention is to provide an organic EL display device using the polarizing film for an organic EL display device or the polarizing film with an adhesive layer for an organic EL display device. Means to solve the problem

As a result of intensive studies conducted by the present inventors in order to solve the aforementioned problems, they have found that the following optical films for organic EL display devices have completed the present invention.

That is, the present invention relates to an optical film for an organic EL display device, which is characterized by having a retardation film and an adhesive layer functioning as a λ / 4 plate, and the adhesive layer is at 40 ° C and 92% RH. The moisture permeability is 50g / (m ² ･ day) or less.

The adhesive layer is preferably an adhesive layer formed of a rubber-based adhesive composition containing polyisobutylene and a hydrogen-abstracting photopolymerization initiator.

The present invention also relates to a polarizing film for an organic EL display device, which includes a polarizer and the optical film for an organic EL display device.

The thickness of the polarizer is preferably 15 μm or less.

The polarizing film for an organic EL display device of the present invention may sequentially include the aforementioned polarizer, a retardation film functioning as a λ / 4 plate, and an adhesive layer, and the adhesive layer is at 40 ° C and 92% RH The moisture permeability below is 50g / (m ² ･ day) or less; the polarizer, the adhesive layer, and the retardation film functioning as a λ / 4 plate can be provided in this order, and the adhesive layer is at 40 ° C. The moisture permeability at 92% RH is less than 50g / (m ² ･ day).

In addition, the present invention relates to a polarizing film with an adhesive layer for an organic EL display device, which further includes an adhesive layer on a polarizer side of the polarizing film for an organic EL display device.

The present invention also relates to an organic EL display device comprising the polarizing film for an organic EL display device or the polarizing film with an adhesive layer for an organic EL display device. Invention effect

The optical film for an organic EL display device of the present invention has an retardation film and an adhesive layer having a specific moisture permeability, and does not need to form a barrier layer composed of an inorganic substance formed by evaporation or the like, and can exhibit excellent low permeability. Wet. The optical film for an organic EL display device of the present invention can constitute an anti-reflection film (a polarizing film for an organic EL display device) together with a polarizer. In addition, the optical film for an organic EL display device of the present invention is quite advantageous in terms of cost.

In addition, the present invention can provide a polarizing film for an organic EL display device having excellent low moisture permeability and a polarizing film with an adhesive layer for an organic EL display device.

Furthermore, the present invention can provide an organic EL display device with excellent optical reliability by using the polarizing film for an organic EL display device or the polarizing film with an adhesive layer for an organic EL display device further containing an adhesive layer.

Form for implementing the invention 1. Optical film for organic EL display device The optical film for organic EL display device of the present invention is characterized by having a retardation film and an adhesive layer functioning as a λ / 4 plate, and the adhesive The moisture permeability of the agent layer at 40 ° C and 92% RH is 50 g / (m ² ･ day) or less.

As shown in FIG. 1, the optical film 1 for an organic EL display device of the present invention has an adhesive layer 2 on at least one side of a retardation film 3 a functioning as a λ / 4 plate. FIG. 1 shows a configuration in which the adhesive layer 2 is provided only on one side of the retardation film 3a, but the adhesive layer 2 may be provided on both sides of the retardation film 3a. In addition, FIG. 1 illustrates a state in which the constituent elements are connected to each other, but the present invention is not limited to this aspect, and other layers may be included between the aforementioned layers. Figures 2 to 4 are also the same.

As shown in FIG. 2, the optical film 1 for an organic EL display device of the present invention may contain a first retardation film 3 a (also sometimes referred to as a first retardation film) that functions as a λ / 4 plate. 2 retardation film 3b. Specifically, it consists of (the retardation film 3a functioning as a λ / 4 plate) / adhesive layer or adhesive layer 4 / second retardation film 3b / adhesive layer 2.

The moisture permeability of the foregoing optical film for an organic EL display device is preferably 50 g / (m ² ･ day) or less, more preferably 30 g / (m ² ･ day) or less, more preferably 20 g / (m ² ･ day) or less, 15 g / ( m ² ･ day) is particularly preferred. In addition, the lower limit value of the moisture permeability is not particularly limited, and ideally, water vapor cannot penetrate at all (that is, 0 g / (m ² ･ day)). If the water vapor transmission rate of the optical film for an organic EL display device is within the foregoing range, when the optical film for an organic EL display device is applied to an organic EL element, moisture can be prevented from entering the organic EL element. Deterioration and the like are suitable. The aforementioned method for measuring the moisture permeability can be measured by the method described in the examples.

Hereinafter, each constituent element constituting the optical film 1 for an organic EL display device of the present invention will be described.

(1) Phase difference film (1-1) Phase difference film functioning as a λ / 4 plate The phase difference film 3a used in the present invention is a film capable of functioning as a λ / 4 plate. The in-plane retardation Re (550) measured by the retardation film 3a at 23 ° C. with light having a wavelength of 550 nm is preferably 100 to 180 nm, more preferably 110 to 170 nm, more preferably 120 to 160 nm, and particularly preferably 135 to 155 nm. The in-plane phase difference Re can be obtained by Re = (nx-ny) × d (d: film thickness (nm)).

The retardation film 3a represents an ellipsoid having a refractive index of nx> ny = nz or nx> ny> nz. Here, nx is the refractive index in the plane with the largest refractive index direction (that is, the slow axis direction), ny is the refractive index in the plane that is orthogonal to the slow axis (that is, the fast axis direction), and nz is the refractive index in the thickness direction . In this specification, ny = nz includes not only the case of exact equality, but also the case of substantially equal.

The Nz coefficient of the retardation film 3a is, for example, preferably 0.9 to 2, 1 to 1.5 is more preferable, and 1 to 1.3 is more preferable. Here, the Nz coefficient can be obtained by Nz = Rth / Re. The Rth is a phase difference in the thickness direction, and can be obtained by Rth = (nx-nz) × d (d: film thickness (nm)).

The thickness of the aforementioned retardation film 3a can be appropriately set in a manner capable of obtaining a desired in-plane retardation, and is not particularly limited, for example, it is preferably 10 to 80 μm, preferably 10 to 60 μm, and more preferably 30 to 55 μm.

The retardation film 3a can exhibit a reverse dispersion wavelength characteristic in which the retardation value increases with the wavelength of the measurement light, and can exhibit a positive wavelength dispersion characteristic in which the retardation value decreases with the wavelength of the measurement light, and can exhibit a retardation value that hardly varies with The flat-wavelength dispersion characteristic of the wavelength change of light is measured, and the flat-wavelength dispersion characteristic should be exhibited. By using a λ / 4 plate with flat wavelength dispersion characteristics, excellent anti-reflection characteristics and reflection hue in the oblique direction can be realized. Re (450) / Re (550) of the retardation film 3a should preferably be 0.85 to 1.03, and Re (650) / Re (550) should be 0.98 to 1.02. Here, Re (λ) is an in-plane phase difference measured at 23 ° C with light having a wavelength of λnm. For example, Re (450) represents an in-plane phase difference measured at 23 ° C with light having a wavelength of 450nm.

The retardation film 3a may be formed of an arbitrary and appropriate resin film that satisfies the above-mentioned optical characteristics. Any appropriate resin may be used as the resin for forming the resin film, and specifically, cycloolefin resins such as polynorbornene, polycarbonate resins, cellulose resins, polyvinyl alcohol resins, and polyfluorene resins And other resins. Of these, polynorbornene and polycarbonate-based resins are preferred.

The above-mentioned polynorbornene means a (co) polymer which can be obtained by using a norbornene-based monomer having a norbornene ring in part or all of a starting material (monomer).

Various products of the aforementioned polynorbornene have been sold on the market. Specific examples include the Japanese trade name "ZEONEX", "ZEONOR", the JSR trade name "Arton", the TICONA trade name "TOPAS", and Mitsui Chemicals (Japan). Make the product name "APEL".

The polycarbonate-based resin contains at least a constituent unit derived from a dihydroxy compound having a bond structure represented by the following structural formula (1), and can contain at least one bond structure "-CH in the molecule at least in the presence of a polymerization catalyst" _{A 2} -hydroxy-dihydroxy compound is prepared by reacting a dihydroxy compound with a carbonic acid diester.

[Chemical Formula 1]

As long as the dihydroxy compound having the bond structure represented by the above structural formula (1) has a structure having two alcoholic hydroxyl groups and a linking group "-CH ₂ -O-" in the molecule, it can be contacted with a polymerization catalyst in the presence of a polymerization catalyst. A compound of a carbonic acid diester to form a polycarbonate may be a compound of any structure, and a plurality of compounds may be used in combination. In addition, as the dihydroxy compound used in the polycarbonate resin, a dihydroxy compound having no bond structure represented by the structural formula (1) may be used in combination. Hereinafter, a dihydroxy compound having a bond structure represented by the structural formula (1) may be simply referred to as a dihydroxy compound (A), and a dihydroxy compound having no bond structure represented by the structural formula (1) may be simply referred to as a dihydroxy compound ( B).

(Dihydroxy compound (A)) The linking group "-CH ₂ -O-" of the dihydroxy compound (A) means a structure of a structural element that mutually bonds with an atom other than a hydrogen atom. Among the linking groups, carbon atoms are preferred in terms of at least an oxygen atom-bondable atom or a carbon atom and an oxygen atom-bondable atom at the same time. The number of the "-CH ₂ -O-" linking group in the dihydroxy compound (A) is 1 or more, and preferably 2 to 4.

More specifically, the dihydroxy compound (A) may be, for example, 9,9-bis (4- (2-hydroxyethoxy) phenyl) fluorene, 9,9-bis (4- (2-hydroxyethoxy) 2-methyl) phenyl) fluorene, 9,9-bis (4- (2-hydroxyethoxy) -3-methylphenyl) fluorene, 9,9-bis (4- (2-hydroxyethyl) (Oxy) -3-isopropylphenyl) fluorene, 9,9-bis (4- (2-hydroxyethoxy) -3-isobutylphenyl) fluorene, 9,9-bis (4- ( 2-hydroxyethoxy) -3-tert-butylphenyl) fluorene, 9,9-bis (4- (2-hydroxyethoxy) -3-cyclohexylphenyl) fluorene, 9,9-bis (4- (2-hydroxyethoxy) -3-phenylphenyl) fluorene, 9,9-bis (4- (2-hydroxyethoxy) -3,5-dimethylphenyl) fluorene, 9,9-bis (4- (2-hydroxyethoxy) -3-tert-butyl-6-methylphenyl) fluorene, 9,9-bis (4- (3-hydroxy-2,2- Compounds having an aromatic group in the side chain and an ether group bonded to the aromatic group in the main chain; dimethyl [4- (2-hydroxyethoxy) phenyl] methane, etc. , Bis [4- (2-hydroxyethoxy) phenyl] diphenylmethane, 1,1-bis [4- (2-hydroxyethoxy) phenyl] ethane, 1,1-bis [4- (2-hydroxyethoxy) phenyl] -1-phenylethane, 2,2-bis [4- (2-hydroxyethoxy) phenyl] propane, 2,2-bis [4- (2 -Hydroxyethoxy) -3-methylphenyl] propane, 2,2-bis [3,5-dimethyl-4- (2-hydroxyethoxy) Yl] propane, 1,1-bis [4- (2-hydroxyethoxy) phenyl] -3,3,5-trimethylcyclohexane, 1,1-bis [4- (2-hydroxyethyl) (Oxy) phenyl] cyclohexane, 1,4-bis [4- (2-hydroxyethoxy) phenyl] cyclohexane, 1,3-bis [4- (2-hydroxyethoxy) benzene Yl] cyclohexane, 2,2-bis [4- (2-hydroxyethoxy) -3-phenylphenyl] propane, 2,2-bis [(2-hydroxyethoxy) -3-iso Propylphenyl] propane, 2,2-bis [3-tert-butyl-4- (2-hydroxyethoxy) phenyl] propane, 2,2-bis [4- (2-hydroxyethoxy ) Phenyl] butane, 2,2-bis [4- (2-hydroxyethoxy) phenyl] -4-methylpentane, 2,2-bis [4- (2-hydroxyethoxy) Phenyl] octane, 1,1-bis [4- (2-hydroxyethoxy) phenyl] decane, 2,2-bis [3-bromo-4- (2-hydroxyethoxy) phenyl ] Propane, 2,2-bis [3-cyclohexyl-4- (2-hydroxyethoxy) phenyl] propane and other bis (hydroxyalkoxyaryl) alkanes; 1,1-bis [4- ( 2-hydroxyethoxy) phenyl] cyclohexane, 1,1-bis [3-cyclohexyl-4- (2-hydroxyethoxy) phenyl] cyclohexane, 1,1-bis [4- (2-hydroxyethoxy) phenyl] cyclopentane and other bis (hydroxyalkoxyaryl) cycloalkanes; 4,4'-bis (2-hydroxyethoxy) diphenyl ether, 4,4 '-Bis (2-hydroxyethoxy) -3,3'-dimethyldiphenyl ether, 4,4'-dihydroxy-2,5-diethoxydiphenyl ether Dihydroxyalkoxydiaryl ethers; 4,4'-bis (2-hydroxyethoxyphenyl) sulfide, 4,4'-bis [4- (2-dihydroxyethoxy)- Dimethylalkoxyaryl sulfides such as 3-methylphenyl] sulfide; 4,4'-bis (2-hydroxyethoxyphenyl) sulfene, 4,4'-bis [4- ( 2-Dihydroxyethoxy) -3-methylphenyl] fluorene and other dihydroxyalkoxyaryl fluorenes; 4,4'-bis (2-hydroxyethoxyphenyl) fluorene, 4, 4'-bis [4- (2-Dihydroxyethoxy) -3-methylphenyl] fluorene and other bishydroxyalkoxyarylfluorenes; 1,4-bishydroxyethoxybenzene, 1,3 -Dihydroxyethoxybenzene, 1,2-dihydroxyethoxybenzene, 1,3-bis [2- [4- (2-hydroxyethoxy) phenyl] propyl] benzene, 1,4- Bis [2- [4- (2-hydroxyethoxy) phenyl] propyl] benzene, 4,4'-bis (2-hydroxyethoxy) biphenyl, 1,3-bis [4- (2 -Hydroxyethoxy) phenyl] -5,7-dimethyladamantane, a sugar alcohol anhydride representing a dihydroxy compound represented by the following formula (2), and spiroglycerol represented by the following general formula (3) These compounds having a cyclic ether structure may be used alone or in combination of two or more.

[Chemical Formula 2]

[Chemical Formula 3]

Examples of the dihydroxy compound represented by the aforementioned formula (2) include isosorbide, mannitol, and isoiditol which have a relationship of stereoisomers. These may be used alone or in combination of two. Use in combination.

In addition, for example, oxyalkylene glycols and glycols having a cyclic ether structure are also suitably used as the dihydroxy compound (A).

Examples of the aforementioned oxyalkylene glycols include diethylene glycol, triethylene glycol, tetraethylene glycol, and polyethylene glycol. Examples of the aforementioned diols having a cyclic ether structure include spiroglycerols, Alkanediols.

Among these dihydroxy compounds (A), they can be obtained by dehydrating and condensing sorbitol made from various starches that are abundant in resources and easy to obtain from the viewpoints of starting and manufacturing ease, optical characteristics, and moldability. Isosorbide is preferred. Further, 9,9-bis [4- (2-hydroxyethoxy) phenyl] fluorene or polyethylene glycol is also preferred.

In addition, when the dihydroxy compound (A) is subjected to a reaction with a carbonic acid diester described later, its form is not particularly limited, and it may be in a powder form, a sheet form, or a liquid state such as a molten state or an aqueous solution.

(Dihydroxy compound (B)) Examples of the dihydroxy compound (B) include alicyclic dihydroxy compounds, aliphatic dihydroxy compounds, and aromatic dihydroxy compounds.

The alicyclic dihydroxy compound is not particularly limited, and a compound containing a 5-membered ring structure or a 6-membered ring structure is preferred. In addition, the 6-member ring structure can be fixed into a chair shape or a boat shape by a covalent bond. The alicyclic dihydroxy compound is suitable because it has a 5-membered ring or 6-membered ring structure and can improve the heat resistance of the obtained polycarbonate. The number of carbon atoms contained in the alicyclic dihydroxy compound is usually 70 or less, preferably 50 or less, and more preferably 30 or less. The larger the value is, the higher the heat resistance is, but it becomes difficult to synthesize, difficult to refine, or increase the cost. The smaller the number of carbon atoms, the easier it is to refine and the better to start with.

Specific examples of the alicyclic dihydroxy compound having a 5-membered ring structure or a 6-membered ring structure include alicyclic dihydroxy compounds represented by the following general formula (I) or (II). HOCH ₂ -R ¹ -CH ₂ OH ... (I) HO-R ² -OH ... (II) (In the formulae (I) and (II), R ¹ and R ² each represent a cycloalkane having 4 to 20 carbon atoms. base.)

Cyclohexanedimethanol, which is an alicyclic dihydroxy compound represented by the general formula (I), includes R ¹ in the general formula (I) and the following general formula (Ia) (where R ³ represents a carbon number of 1 to 12). Alkyl or hydrogen atom). Specific examples include 1,2-cyclohexanedimethanol, 1,3-cyclohexanedimethanol, 1,4-cyclohexanedimethanol, and the like.

[Chemical Formula 4]

Tricyclodecane dimethanol and pentacyclopentadecane dimethanol, which are alicyclic dihydroxy compounds represented by the general formula (I), include the general formula (I) and R ^{1 is} represented by the following general formula (Ib) (wherein, n represents various isomers represented by 0 or 1).

[Chemical Formula 5]

Decalin or tricyclotetradecane dimethanol, which is an alicyclic dihydroxy compound represented by the general formula (I), contains R ¹ in the general formula (I) in the following general formula (Ic) (wherein, m represents various isomers represented by 0 or 1). Specific examples of such isomers include 2,6-decahydronaphthalenedimethanol, 1,5-decahydronaphthalenedimethanol, and 2,3-decahydronaphthalenedimethanol.

[Chemical Formula 6]

The norbornane dimethanol as the alicyclic dihydroxy compound represented by the general formula (I) includes various isomers of which R ¹ in the general formula (I) is represented by the following general formula (Id). Specific examples of such isomers include 2,3-norbornanedimethanol and 2,5-norbornanedimethanol.

[Chemical Formula 7]

The adamantane dimethanol as the alicyclic dihydroxy compound represented by the general formula (I) includes various isomers in which R ¹ in the general formula (I) is represented by the following general formula (Ie). Specific examples of such isomers include 1,3-adamantane dimethanol.

[Chemical Formula 8]

The cyclohexanediol of the alicyclic dihydroxy compound represented by the general formula (II) includes R ² in the general formula (II) and the following general formula (IIa) (wherein R ³ represents a carbon number of 1 to 12). Alkyl or hydrogen atom). Specific examples of such isomers include 1,2-cyclohexanediol, 1,3-cyclohexanediol, 1,4-cyclohexanediol, 2-methyl-1,4-cyclohexanediol, and the like .

[Chemical Formula 9]

Tricyclodecanediol and pentacyclopentadecanediol, which are alicyclic dihydroxy compounds represented by the general formula (II), include R ² in the general formula (II) in the following general formula (IIb) (wherein, n represents various isomers represented by 0 or 1).

[Chemical Formula 10]

Decalin or tricyclotetradecanediol, which is an alicyclic dihydroxy compound represented by the general formula (II), contains R ² in the general formula (II) in the following general formula (IIc) (wherein, m represents various isomers represented by 0 or 1). Specific examples of such isomers include 2,6-decahydronaphthalene glycol, 1,5-decahydronaphthalene glycol, 2,3-decahydronaphthalene glycol, and the like.

[Chemical Formula 11]

As the norbornanediol of the alicyclic dihydroxy compound represented by the general formula (II), various isomers of R ² in the general formula (II) represented by the following general formula (IId) are included. Specific examples of such isomers include 2,3-norbornanediol, 2,5-norbornanediol, and the like.

[Chemical Formula 12]

The adamantanediol as the alicyclic dihydroxy compound represented by the general formula (II) includes various isomers in which R ² in the general formula (II) is represented by the following general formula (IIe). Specific examples of such isomers include 1,3-adamantanediol and the like.

[Chemical Formula 13]

Among the specific examples of the alicyclic dihydroxy compound, cyclohexanedimethanols, tricyclodecanedimethanols, adamantanediols, and pentacyclopentadecanedimethanols are particularly suitable. From the viewpoint of good operation and the like, 1,4-cyclohexanedimethanol, 1,3-cyclohexanedimethanol, 1,2-cyclohexanedimethanol, and tricyclodecanedimethanol are preferred.

Examples of the aliphatic dihydroxy compound include ethylene glycol, 1,3-propanediol, 1,2-propanediol, 1,4-butanediol, 1,3-butanediol, 1,2-butanediol, and 1 , 5-heptanediol, 1,6-hexanediol and the like.

Examples of the aforementioned aromatic dihydroxy compound include 2,2-bis (4-hydroxyphenyl) propane [= bisphenol A], 2,2-bis (4-hydroxy-3,5-dimethylphenyl) propane , 2,2-bis (4-hydroxy-3,5-diethylphenyl) propane, 2,2-bis (4-hydroxy- (3,5-diphenyl) phenyl) propane, 2,2 -Bis (4-hydroxy-3,5-dibromophenyl) propane, 2,2-bis (4-hydroxyphenyl) pentane, 2,4'-dihydroxy-diphenylmethane, bis (4-hydroxy Phenyl) methane, bis (4-hydroxy-5-nitrophenyl) methane, 1,1-bis (4-hydroxyphenyl) ethane, 3,3-bis (4-hydroxyphenyl) pentane, 1 , 1-bis (4-hydroxyphenyl) cyclohexane, bis (4-hydroxyphenyl) fluorene, 2,4'-dihydroxydiphenylfluorene, bis (4-hydroxyphenyl) sulfide, 4, 4'-dihydroxydiphenyl ether, 4,4'-dihydroxy-3,3'-dichlorodiphenyl ether, 9,9-bis (4-hydroxyphenyl) fluorene, 9,9-bis ( 4-hydroxy-2-methylphenyl) fluorene and the like.

The compounds shown above are only examples of alicyclic dihydroxy compounds, aliphatic dihydroxy compounds, and aromatic dihydroxy compounds that can be used in the present invention, and are not limited thereto. These compounds can be used individually by 1 type or in mixture of 2 or more types.

By using these dihydroxy compounds (B), effects such as improvement in flexibility, heat resistance, and moldability according to the application can be obtained.

The ratio of the dihydroxy compound (A) to the all-dihydroxy compound constituting the polycarbonate resin is not particularly limited, and it is preferably 10 mol% or more, more preferably 40 mol% or more, and more preferably 60 mol% or more. The upper limit is preferably 100 mol% or less. If the content ratio of the constituent unit derived from the dihydroxy compound (B) is too large, performance such as optical characteristics may be reduced.

In addition, when an alicyclic dihydroxy compound, an aliphatic dihydroxy compound, or an aromatic dihydroxy compound is used, the total of the dihydroxy compound (A) and the respective dihydroxy compounds relative to the total dihydroxy compound constituting the polycarbonate is used. The ratio is not particularly limited, and a ratio may be selected. The content ratio of the constitutional unit derived from the dihydroxy compound (A) and the constitutional unit derived from each of these dihydroxy compounds is not particularly limited, and may be an optional ratio.

(Carbonate diester) Carbonate diesters that can be used in the production method of polycarbonate resins include substituted diphenyl carbonate, dimethyl carbonate, and carbonic acid represented by diphenyl carbonate and xylyl carbonate. Diethyl ester and di-tert-butyl carbonate, etc. Among these, diphenyl carbonate and substituted diphenyl carbonate are particularly preferred. These carbonic acid diesters may be used individually by 1 type, and may mix and use 2 or more types.

Relative to the total dihydroxy compound used in the reaction, the carbonic acid diester is preferably used at a molar ratio of 0.90 to 1.10, and a molar ratio of 0.96 to 1.04 is preferred. If the molar ratio is less than 0.90, the terminal OH groups of the polycarbonate produced may increase, so that the thermal stability of the polymer is deteriorated, and a desired high molecular weight body cannot be obtained. In addition, if the molar ratio is greater than 1.10, not only may the transesterification reaction speed be slowed under the same conditions, making it difficult to produce a polycarbonate having a desired molecular weight, and remaining carbonate diesters in the polycarbonate copolymer produced. The amount may also increase, and the residual carbonic acid diester is a source of odor during molding or molding.

For film applications, flexibility is usually required. Therefore, the glass transition temperature (Tg) of the polycarbonate resin is preferably 45 ° C or higher, and preferably 45 to 130 ° C.

The polycarbonate-based resin can be produced by a melt polymerization method in which a dihydroxy compound containing the dihydroxy compound (A) is reacted with a carbonic acid diester in the presence of a polymerization catalyst. The type and addition amount of the polymerization catalyst can be suitably selected from known publicly known substances and addition amounts, and the solution polymerization method can also be appropriately adopted from known publicly known methods.

The retardation film 3a can be produced by, for example, extending a film made of the resin described above. As a method for forming a thin film from the resin, an arbitrary and appropriate forming method can be adopted. Specific examples include compression molding method, injection molding method, injection molding method, extrusion molding method, blow molding method, powder molding method, FRP molding method, casting coating method (such as flow casting method), and calendering method. , Hot pressing and so on. Among these methods, an extrusion molding method or a casting coating method is preferable, because the smoothness of the obtained film can be improved, and good optical uniformity can be obtained. The molding conditions can be appropriately set according to the resin composition, type, and characteristics required for the retardation film to be used. In addition, the above-mentioned resins have been sold on the market in a variety of film products, and the commercially available films can also be directly processed for stretching.

The stretching ratio of the film can be appropriately set according to the in-plane retardation value and thickness required for the retardation film 3a, the type of resin used, the thickness of the film used, and the stretching temperature. Specifically, the extension magnification should be about 1.75 to 3.00 times, preferably 1.80 to 2.80 times, and more preferably 1.85 to 2.60 times.

The stretching temperature of the film can be appropriately set in accordance with the in-plane retardation value and thickness required for the retardation film 3a, the type of resin used, the thickness of the film used, and the stretching ratio. Specifically, the extension temperature is preferably about 125 ° C to 150 ° C, and preferably about 130 ° C to 140 ° C.

The film may be stretched by any appropriate method. Specifically, various extension methods such as free-end extension, fixed-end extension, free-end contraction, and fixed-end contraction can be used individually or simultaneously or successively. The extending direction may be performed in various directions and dimensions such as a horizontal direction, a vertical direction, a thickness direction, and a diagonal direction.

In one embodiment, the retardation film 3a can be formed by uniaxially extending the free end of the resin film or uniaxially extending the fixed end. A specific example of the uniaxial extension of the free end may be a method in which the resin film is moved in the long-side direction, and at the same time, it is extended between rollers having different peripheral speeds. A specific example of the uniaxial extension of the fixed end may be a method in which the resin film is moved in the longitudinal direction while extending in the width direction (lateral direction).

In another embodiment, the retardation film 3a is produced by continuously extending an oblong resin film obliquely in a direction at a predetermined angle with respect to the longitudinal direction. By adopting oblique stretching, a long stretched film having an alignment angle (slow axis along the direction of the predetermined angle) with a predetermined angle with respect to the long side direction of the film can be obtained. For example, when laminated with a polarizer, a roll Pair the rolls so that the manufacturing steps can be simplified. In addition, the roll-to-roll means a method of laminating layers while aligning the strip direction while conveying a film with a roll.

The stretching machine used for the oblique extension can be a tenter type stretching machine, which can apply pushing force, stretching force or traction force at different speeds of left and right in the lateral and / or longitudinal directions. The tenter-type stretching machine includes a horizontal uniaxial stretching machine and a simultaneous biaxial stretching machine. As long as the long resin film can be continuously stretched diagonally, any appropriate stretching machine can be used.

Since the optical film for an organic EL display device of the present invention does not have a barrier layer containing an inorganic film, the retardation film 3a does not have a barrier layer containing an inorganic film. Such inorganic thin films can usually be formed by sputtering or the like, but generate heat during the formation process. If such an inorganic film is provided on the retardation film 3a, the retardation value of the retardation film 3a may be changed due to heat or the retardation film 3a may be broken, which is not ideal. Examples of the inorganic thin film include at least one inorganic compound selected from the group consisting of an oxide, a nitride, a hydride, and a composite compound thereof. Examples of the inorganic compound forming the inorganic thin film include diamond-like carbon (DLC), silicon nitride (SiNx), silicon oxide (SiOy), aluminum oxide (AlOz), aluminum nitride, and the like.

(1-2) Second retardation film The second retardation film 3b is preferably one having a relationship between nz> nx ≧ ny and exhibiting a refractive index characteristic. The second retardation film having such a refractive index characteristic is suitable because it can reduce the angular dependence of the effect of absorbing reflected light and prevent the reflected light reflected at various angles from being emitted.

The retardation Rth (550) in the thickness direction of the second retardation film 3b is preferably -260 nm to -10 nm, more preferably -230 nm to -15 nm, and even more preferably -215 nm to -20 nm. When it is set to the said range, the said effect will be exhibited remarkably, and it is suitable.

In one embodiment, the second retardation film 3b has a relationship in which the refractive index is nx = ny. Here, "nx = ny" includes not only the case where nx and ny are exactly equal, but also the case where nx and ny are substantially equal. Specifically, it means that Re (550) is less than 10 nm. In another embodiment, the second retardation film 3b has a relationship of refractive index nx> ny. At this time, the in-plane retardation Re (550) of the second retardation film 3b is preferably 10 nm to 150 nm, and more preferably 10 nm to 80 nm.

The second retardation film 3b can be formed of any appropriate material, and is not particularly limited, but it is preferably fixed to a liquid crystal layer with a vertical alignment. The liquid crystal material (liquid crystal compound) capable of adopting vertical alignment may be a liquid crystal monomer or a liquid crystal polymer. Specific examples of the liquid crystal compound and the method for forming the liquid crystal layer include the liquid crystal compounds and formation methods described in paragraphs [0020] to [0042] in JP 2002-333642. At this time, the thickness is preferably 0.1 μm to 5 μm, and more preferably 0.2 μm to 3 μm.

As another suitable specific example, the second retardation film 3b may be a retardation film formed of a fumaric acid diester resin described in Japanese Patent Application Laid-Open No. 2012-32784. At this time, the thickness is preferably 5 μm to 50 μm, and preferably 10 μm to 35 μm.

The in-plane retardation (550) Re of the multilayer retardation film composed of the first retardation film 3a and the second retardation film 3b is preferably 120 nm to 160 nm, more preferably 130 nm to 150 nm, and more preferably 135 nm to 145 nm.

The thickness retardation Rth (550) of the multilayer retardation film composed of the first retardation film 3a and the second retardation film 3b is preferably 40 nm to 100 nm, preferably 50 nm to 90 nm, and more preferably 60 nm to 80 nm.

The first retardation film 3 a and the second retardation film 3 b can be laminated through any adhesive layer or adhesive layer 4. The adhesive layer or the adhesive layer 4 is suitable for using the materials described in this specification. For example, an acrylic adhesive using a (meth) acrylic polymer as a base polymer has good optical transparency and exhibits moderate wettability and cohesiveness. It is suitable because it has excellent adhesive properties and excellent weather resistance and heat resistance. In addition, any known adhesive layer or adhesive layer may be used.

(2) Adhesive agent layer The moisture permeability of the adhesive agent layer used in the present invention at 40 ° C and 92% RH is only required to be 50 g / (m ² 2day) or less, and its composition is not particularly limited. Here, the "adhesive layer" means an adhesive layer or an adhesive layer.

The moisture permeability of the aforementioned adhesive layer is 50 g / (m ² ･ day) or less, preferably 30 g / (m ² ･ day) or less, preferably 20 g / (m ² ･ day) or less, 15 g / (m ² ･ day) ) The following is better. In addition, the lower limit value of the moisture permeability is not particularly limited, and ideally, water vapor cannot penetrate at all (that is, 0 g / (m ² ･ day)). If the moisture permeability of the adhesive layer is within the aforementioned range, when an optical film (phase retardation film) containing the adhesive layer is applied to an organic EL element, moisture can be prevented from entering the organic EL element, and thus the organic EL element can be suppressed. Deterioration due to moisture and the like are suitable. The water vapor transmission rate (water vapor transmission rate) of the water vapor transmission adhesive layer having a thickness of 50 μm under the conditions of 40 ° C. and 92% RH can be measured by a method described in Examples.

(2-1) Adhesive layer The adhesive layer may have a water vapor transmission rate of 50 g / (m ²以下 day) or less at 40 ° C and 92% RH, and its composition is not particularly limited, and an arbitrary and appropriate adhesive layer may be used. Agent-formed layer. Examples of such adhesives include natural rubber adhesives, α-olefin-based adhesives, urethane resin-based adhesives, ethylene-vinyl acetate resin latex adhesives, and ethylene-vinyl acetate resin hot-melt adhesives. , Epoxy resin adhesive, vinyl chloride resin solvent adhesive, chloroprene rubber adhesive, cyanoacrylate adhesive, polysiloxane adhesive, styrene-butadiene rubber solvent adhesive Agent, nitrile rubber-based adhesive, nitrocellulose-based adhesive, reactive hot-melt adhesive, phenol resin-based adhesive, modified silicone adhesive, polyester-based hot-melt adhesive, polyamide resin Adhesives, Polyimide-based adhesives, Polyurethane resin hot-melt adhesives, Polyolefin resin hot-melt adhesives, Polyvinyl acetate resin solvent-based adhesives, Polystyrene resin solvent-based adhesives, Polyvinyl alcohol based adhesive, polyvinylpyrrolidone resin based adhesive, polyvinyl butyral based adhesive, polybenzimidazole based adhesive, polymethacrylate resin solvent based adhesive, melamine resin based adhesive , Resin-based adhesive, resorcinol-based adhesive agent. These adhesives can be used individually by 1 type or in mixture of 2 or more types.

If classified according to the bonding form, examples of the bonding agent include a thermosetting adhesive, a hot-melt adhesive, and the like. These adhesives may be used alone or in combination of two or more.

The thermosetting adhesive agent is thermally cured and cured by heating to develop an adhesive force. Examples of the thermosetting adhesive include epoxy-based thermosetting adhesives, urethane-based thermosetting adhesives, and acrylic-based thermosetting adhesives. The curing temperature of the thermosetting adhesive is, for example, 100 to 200 ° C.

The hot-melt adhesive is hot-melted to the adherend by melting or softening by heating, and then solidifies by cooling, and then adheres to the adherend. Examples of the hot-melt adhesive include a rubber-based hot-melt adhesive, a polyester-based hot-melt adhesive, a polyolefin-based hot-melt adhesive, an ethylene-vinyl acetate resin-based hot-melt adhesive, and a polyamide resin hot-melt adhesive. , Polyurethane resin hot-melt adhesives and so on. The softening temperature (ring and ball method) of the hot-melt adhesive is, for example, 100 to 200 ° C. The melt viscosity of the hot melt adhesive is 180 ° C, for example, 100 to 30,000 mPa ･ s.

The thickness of the adhesive layer is not particularly limited, but is preferably about 0.01 to 10 μm, and more preferably about 0.05 to 8 μm.

(2-2) Adhesive layer The moisture permeability of the adhesive layer at 40 ° C and 92% RH may be 50 g / (m ² ･ day) or less. The composition is not particularly limited, and arbitrary and appropriate adhesion may be used. A layer formed by the agent composition. Examples of the adhesive composition include: rubber-based adhesives, acrylic-based adhesives, polysiloxane-based adhesives, urethane-based adhesives, vinyl alkyl ether-based adhesives, polyvinyl alcohol-based adhesives, polymer Vinyl pyrrolidone-based adhesives, polypropylene amidamine-based adhesives, cellulose-based adhesives, and the like are preferably rubber-based adhesive compositions from the viewpoint of moisture permeability.

The rubber-based adhesive composition may include a rubber-based polymer, and its composition is not particularly limited.

The rubber-based polymer used in the present invention is a polymer that can exhibit rubber elasticity in a temperature range near room temperature. Specific examples include styrene-based thermoplastic elastomers, isobutylene-based polymers, and the like. In the present invention, polyisobutylene (PIB), which is an isobutylene homopolymer, is preferably used from the viewpoint of weather resistance. This is because polyisobutylene does not contain a double bond in the main chain, so it has excellent light resistance.

As the polyisobutylene, commercially available products such as OPPANOL manufactured by BASF can be used.

The weight average molecular weight (Mw) of the aforementioned polyisobutylene is preferably 100,000 or more, more preferably 300,000 or more, more preferably 600,000 or more, and even more preferably 700,000 or more. The upper limit of the weight average molecular weight is not particularly limited, but it is preferably 5 million or less, more preferably 3 million or less, and more preferably 2 million or less. By setting the weight-average molecular weight of the polyisobutylene to 100,000 or more, a rubber-based adhesive composition having good durability during high-temperature storage can be produced.

The content of the aforementioned polyisobutylene is not particularly limited, but it is preferably 50% by weight or more, 60% by weight or more, 70% by weight or more, 80% by weight or more in the total solid content of the rubber-based adhesive composition It is more preferably 85% by weight or more, and more preferably 90% by weight or more. The upper limit of the content of the polyisobutylene is not particularly limited, but is preferably 99% by weight or less, and more preferably 98% by weight or less. Containing polyisobutylene in the above range is preferable because it has low moisture permeability.

The rubber-based adhesive composition used in the present invention may contain a polymer or an elastomer other than the aforementioned polyisobutylene. Specific examples include copolymers of isobutylene and n-butene, copolymers of isobutylene and isoprene (such as standard butyl rubber, chlorinated butyl rubber, brominated butyl rubber, partially cross-linked butyl rubber, etc. Based rubbers), such sulfur compounds and modified products (such as those modified by functional groups such as hydroxyl, carboxyl, amine, epoxy, etc.) isobutylene polymers; styrene-ethylene-butene-styrene Block copolymer (SEBS), styrene-isoprene-styrene block copolymer (SIS), styrene-butadiene-styrene block copolymer (SBS), styrene-ethylene-propylene- Styrenic block copolymer (SEPS, SIS hydride), styrene-ethylene-propylene block copolymer (SEP, styrene-isoprene block copolymer hydride), styrene-isobutylene-benzene Styrene-based thermoplastic elastomers such as styrene-based block copolymers such as ethylene block copolymer (SIBS) and styrene-butadiene rubber (SBR); butyl rubber (IIR), butadiene rubber (BR ), Acrylonitrile-butadiene rubber (NBR), EPR (binary ethylene-propylene rubber), EPT (ternary ethylene-propylene rubber), acrylic rubber, urethane Ester rubber, polyurethane based thermoplastic elastomers; polyester based thermoplastic elastomers; mixed thermoplastic elastomers such as polypropylene and EPT (ternary ethylene-propylene rubber) polymer blends. These can be added within a range that does not impair the effect of the present invention, and it is preferably about 10 parts by weight or less with respect to 100 parts by weight of the aforementioned polyisobutylene, and it is preferable not to contain them from the viewpoint of durability.

The rubber-based adhesive composition used in the present invention preferably contains the aforementioned polyisobutylene and a hydrogen-abstracting photopolymerization initiator.

The aforementioned hydrogen-abstracting type photopolymerization initiator means that the initiator itself can irradiate hydrogen from the aforementioned polyisobutylene without cracking by irradiating active energy rays to form a reaction point in the polyisobutylene. By forming this reaction point, a polyisobutylene cross-linking reaction can be initiated.

Photopolymerization initiators In addition to the hydrogen-abstracting photopolymerization initiators used in the present invention, cracking photopolymerization initiators are also known. The photopolymerization initiator cracks and decomposes the photopolymerization initiator itself through irradiation of active energy rays to generate free radicals. However, if a cracking-type photopolymerization initiator is used for the polyisobutylene used in the present invention, the main chain of the polyisobutylene will be cut off by a photopolymerization initiator that generates radicals, so that crosslinking cannot be performed. In the present invention, polyisobutylene can be crosslinked as described above by using a hydrogen abstraction type photopolymerization initiator.

Examples of hydrogen abstraction type photopolymerization initiators include acetophenone, diphenyl ketone, o-benzoylbenzoic acid methyl-4-phenyldiphenyl ketone, 4,4'-dichlorodiphenyl ketone, and hydroxy Diphenyl ketone, 4,4'-dimethoxydiphenyl ketone, 4,4'-dichlorodiphenyl ketone, 4,4'-dimethyldiphenyl ketone, 4-benzylidene -4'-methyl-diphenyl sulfide, acrylated diphenyl ketone, 3,3 ', 4,4'-tetrakis (tributylbutyloxycarbonyl) diphenyl ketone, 3,3' -Diphenyl ketone compounds such as dimethyl-4-methoxydiphenyl ketone; 2-isopropyl 9-oxosulfide 2,4-dimethyl 9-oxosulfur , 2,4-diethyl 9-oxysulfur , 2,4-dichloro 9-oxysulfur 9-oxysulfur Compounds; 4,4'-bis (dimethylamino) diphenyl ketone, 4,4'-diethylamino diphenyl ketone and other amino diphenyl ketone compounds; 10-butyl- 2-chloroacridone, 2-ethylanthraquinone, 9,10-phenanthrenequinone, camphorquinone, etc .; aromatic ketone compounds such as naphthyl ethyl ketone, 1-hydroxycyclohexylphenyl ketone; aromatics such as terephthalaldehyde Quinone aromatic compounds such as aldehydes and methylanthraquinone. These can be used individually by 1 type or in mixture of 2 or more types. From the viewpoint of reactivity, diphenyl ketone compounds are preferable among these, and diphenyl ketone is preferable.

The content of the hydrogen abstraction type photopolymerization initiator is preferably 0.001 to 10 parts by weight, more preferably 0.005 to 10 parts by weight, and still more preferably 0.01 to 10 parts by weight relative to 100 parts by weight of the aforementioned polyisobutylene. A hydrogen abstraction-type photopolymerization initiator containing the aforementioned range is suitable because the crosslinking reaction can be advanced to a desired density.

Further, in the present invention, a cracking type photopolymerization initiator may be used together with the hydrogen abstraction type photopolymerization initiator as long as the effect of the present invention is not impaired, but it is not necessary for the foregoing reasons.

The rubber-based adhesive composition used in the present invention may further contain a polyfunctional radical polymerizable compound. In the present invention, the polyfunctional radically polymerizable compound is one which functions as a crosslinking agent for polyisobutylene.

The polyfunctional radical polymerizable compound is a compound having at least two radical polymerizable functional groups having an unsaturated double bond such as a (meth) acrylfluorenyl group or a vinyl group. Specific examples of the polyfunctional radical polymerizable compound include tripropylene glycol di (meth) acrylate, tetraethylene glycol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, 1,9-nonanediol di (meth) acrylate, 1,10-decanediol di (meth) acrylate, 2-ethyl-2-butylpropanediol di (meth) acrylate, bisphenol A di (meth) acrylate, bisphenol A ethylene oxide adduct di (meth) acrylate, bisphenol A propylene oxide adduct di (meth) acrylate, bisphenol A diepoxy Propyl ether di (meth) acrylate, neopentyl glycol di (meth) acrylate, tricyclodecane dimethanol di (meth) acrylate, di Alkanediol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, neopentaerythritol tri (meth) acrylate, neopentaerythritol tetra (meth) acrylate, dineopent Esters of (meth) acrylic acid and polyhydric alcohols such as tetraol penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate, EO modified diglycerol tetra (meth) acrylate, 9,9-bis [4- (2- (meth) propenyloxyethoxy) phenyl] fluorene and the like. These can be used individually by 1 type or in mixture of 2 or more types. Among these, from the viewpoint of compatibility with polyisobutylene, an esterified product of (meth) acrylic acid and a polyhydric alcohol is preferable, and a bifunctional (meth) acrylic acid having two (meth) acrylfluorenyl groups Esters, trifunctional (meth) acrylates having three or more (meth) acrylfluorenyl groups are preferred, tricyclodecanedimethanol di (meth) acrylate, trimethylolpropane tri (meth) acrylate It's better.

The content of the polyfunctional radical polymerizable compound is preferably 20 parts by weight or less, more preferably 15 parts by weight or less, and more preferably 10 parts by weight or less with respect to 100 parts by weight of the polyisobutylene. The lower limit of the content of the polyfunctional radically polymerizable compound is not particularly limited. For example, it is preferably 0.1 part by weight or more, more preferably 0.5 part by weight or more, and more preferably 1 part by weight or more with respect to 100 parts by weight of the aforementioned polyisobutylene. . From the viewpoint of durability of the obtained rubber-based adhesive layer, the content of the polyfunctional radical polymerizable compound is preferably within the aforementioned range.

The molecular weight of the polyfunctional radical polymerizable compound is not particularly limited, but is preferably about 1,000 or less, and more preferably about 500 or less.

The rubber-based adhesive composition used in the present invention may contain at least one tackifier selected from the group consisting of a terpene-containing tackifier, a rosin-based tackifier, and a hydride thereof. . If a rubber-based adhesive composition contains a tackifier, it is highly adhesive to various adherends, and a rubber-based adhesive layer having high durability can be formed even in a high-temperature environment, so it is suitable. .

The aforementioned terpene-containing tackifier may be a terpene polymer such as α-pinene polymer, β-pinene polymer, dipentene polymer, or the aforementioned terpene polymer may be modified (phenol modification, Modified terpene resins such as styrene modification, aromatic modification, hydrogenation modification, hydrocarbon modification, etc.). Examples of the modified terpene resin include a terpene phenol resin, a styrene modified terpene resin, an aromatic modified terpene resin, a hydrogenated terpene resin (hydrogenated terpene resin), and the like. Examples of the hydrogenated terpene resins mentioned herein include hydrides of terpene polymers and other modified terpene resins and hydrogenated products of terpene phenol resins. From the viewpoint of compatibility and adhesive properties with respect to the rubber-based adhesive composition, a hydrogenated product of a terpene phenol resin is preferable among these.

Examples of the aforementioned rosin skeleton-containing tackifier include rosin resin, polymerized rosin resin, hydrogenated rosin resin, rosin ester resin, hydrogenated rosin ester resin, and rosin phenol resin. Specifically, rosin gum, wood rosin, and tall oil rosin can be used. Such as unmodified rosin (raw rosin) or hydrogenated, heterogenized, polymerized, other chemically modified modified rosin and derivatives thereof.

As the aforementioned tackifier, for example, commercially available products such as CLEARON series, POLYSTER series, Arakawa Chemical Industry Co., Ltd., Super Ester series, PENSEL series, and PINCRYSTAL series manufactured by YASUHARA CHEMICAL CO., LTD. Can be used.

When the aforementioned tackifier is a hydrogenated substance, the hydrogenation may be a partially hydrogenated substance obtained by partial hydrogenation, or a completely hydrogenated substance obtained by hydrogenation of all double bonds in the compound. In the present invention, from the standpoint of adhesion characteristics, weather resistance, and hue, a completely hydrogenated substance is preferred.

From the viewpoint of adhesion characteristics, the aforementioned tackifier preferably contains a cyclohexanol skeleton. The detailed principle is unknown, but we speculate that the compatibility between the cyclohexanol skeleton and the polyisobutylene of the base polymer is more balanced than the phenol skeleton. The cyclohexanol skeleton-containing tackifier is, for example, a hydrogenated product of terpene phenol resin, rosin phenol resin, etc., and a completely hydrogenated product of terpene phenol resin, rosin phenol resin, etc. is preferred.

The softening point (softening temperature) of the aforementioned tackifier is not particularly limited, and is preferably about 80 ° C. or higher, and more preferably about 100 ° C. or higher. If the softening point of the tackifier is above 80 ° C, it is suitable because the tackifier does not soften and maintains the adhesive properties even at high temperatures. The upper limit of the softening point of the tackifier is not particularly limited, but if the softening point is too high, defects such as higher molecular weight, poor compatibility, and whitening may occur, so it is preferably about 200 ° C or lower, 180 It is preferably about below ℃. The softening point of the tackifying resin referred to herein is defined as a value measured in accordance with a softening point test method (ring and ball method) specified in any one of JIS K5902 and JIS K2207.

The weight average molecular weight (Mw) of the aforementioned tackifier is not particularly limited, but is preferably 50,000 or less, and preferably 30,000 or less, more preferably 10,000 or less, more preferably 8,000 or less, and even more preferably 5,000 or less. The lower limit of the weight average molecular weight of the aforementioned tackifier is not particularly limited, but it is preferably 500 or more, more preferably 1,000 or more, and more preferably 2000 or more. If the weight average molecular weight of the said tackifier is in the said range, it will be compatible with polyisobutylene, and it will not cause bad conditions, such as whitening, and it is suitable.

Relative to 100 parts by weight of the aforementioned polyisobutylene, the added amount of the aforementioned tackifier is preferably 40 parts by weight or less, preferably 30 parts by weight or less, and more preferably 20 parts by weight or less. The lower limit of the amount of the tackifier is not particularly limited, but it is preferably 0.1 part by weight or more, preferably 1 part by weight or more, and more preferably 5 parts by weight or more. It is suitable to make the use amount of the tackifier within the aforementioned range to improve the adhesion characteristics. In addition, if the used amount of the tackifier is more than the above range, the cohesive force of the tackifier tends to decrease, which is not suitable.

Moreover, you may add the tackifier other than the said terpene skeleton containing tackifier and the rosin skeleton containing tackifier to the rubber-type adhesive composition used for this invention. Examples of the tackifier include petroleum resin-based tackifiers. Examples of the petroleum-based tackifier include aromatic petroleum resins, aliphatic petroleum resins, alicyclic petroleum resins (aliphatic cyclic petroleum resins), aliphatic fluorene aromatic petroleum resins, and aliphatic fluorene alicyclic resins. Family petroleum resins, hydrogenated petroleum resins, benzylfuran-based resins, benzylfuran-indene resins, and the like.

The petroleum resin-based tackifier can be used within a range that does not impair the effects of the present invention. For example, it is preferable to use about 30 parts by weight or less with respect to 100 parts by weight of the polyisobutylene.

An organic solvent may be added to the rubber-based adhesive composition as a diluent. The diluent is not particularly limited, and examples thereof include toluene, xylene, n-heptane, and dimethyl ether. These may be used alone or in combination of two or more. Among these, toluene is preferred.

The amount of the diluent to be added is not particularly limited. For example, it is suitable to add about 50 to 95% by weight to the rubber-based adhesive composition, and it is preferable to add about 70 to 90% by weight. From the viewpoint of the applicability to a support and the like, it is quite appropriate to set the amount of the diluent to fall within the aforementioned range.

To the extent that the effects of the present invention are not impaired, additives other than those described above may be added to the rubber-based adhesive composition used in the present invention. Specific examples of the additives include softeners, cross-linking agents (such as polyisocyanate, epoxy compounds, alkyl etherified melamine compounds, etc.), fillers, anti-aging agents, and ultraviolet absorbers. The types, combinations, and amounts of additives that can be added to the rubber-based adhesive composition can be appropriately set depending on the purpose. The content (total amount) of the aforementioned additives in the rubber-based adhesive composition is preferably 30% by weight or less, more preferably 20% by weight or less, and more preferably 10% by weight or less.

The adhesive layer used in the present invention can be formed from the aforementioned adhesive composition, and the manufacturing method is not particularly limited. For example, the adhesive composition can be coated on various supports, and then dried by heating or irradiating active energy rays. Form an adhesive layer.

When the rubber-based adhesive composition contains polyisobutylene, it is preferable to irradiate the adhesive composition with active energy rays to crosslink the polyisobutylene. The irradiation of the active energy ray is generally performed by applying the rubber-based adhesive composition to various supports or the like, and then irradiating the obtained coating layer. In addition, the above-mentioned active energy ray may be directly irradiated on the coating layer (without bonding other members, etc.), or may be irradiated after the coating layer is bonded with various members such as optical films such as separators or glass. When the optical film or various members are bonded and then irradiated, active energy rays may be irradiated through the optical film or various members, or the optical film or various members may be peeled off and then the active energy rays may be irradiated from the peeling surface.

Various methods can be used for the coating method of the said adhesive composition. Specifically, for example, a roll coating method, a kiss-roll coating method, a gravure coating method, a reverse coating method, a roll brush method, a spray method, a dip roll coating method, a bar coating method, and a doctor blade coating method may be mentioned. Cloth method, pneumatic blade coating method, curtain coating method, lip coating method, extrusion coating method using a die coater, and the like.

When the coating layer of the aforementioned adhesive composition is heated and dried, the heating and drying temperature is preferably about 30 ° C to 200 ° C, preferably 40 ° C to 180 ° C, and more preferably 80 ° C to 150 ° C. By setting the heating temperature within the above range, an adhesive layer having excellent adhesive properties can be obtained. The drying time can be appropriately adopted. The above drying time is preferably about 5 seconds to 20 minutes, preferably 30 seconds to 10 minutes, and more preferably 1 minute to 8 minutes.

In addition, even in the case where the coating layer of the adhesive composition is irradiated with active energy rays, when the adhesive or the adhesive composition contains an organic solvent as a diluent, it is still suitable after coating or before irradiation with active energy rays. The solvent and the like are removed by heating and drying.

The heating and drying temperature is not particularly limited, but from the viewpoint of reducing the remaining solvent, it is preferably about 30 ° C to 90 ° C, and more preferably about 60 ° C to 80 ° C. The drying time can be appropriately adopted. The above drying time is preferably about 5 seconds to 20 minutes, preferably 30 seconds to 10 minutes, and more preferably 1 minute to 8 minutes.

Examples of the aforementioned active energy rays include visible light, ultraviolet rays, and electron rays. Among these, ultraviolet rays are preferred.

The irradiation conditions of the ultraviolet rays are not particularly limited, and the composition of the rubber-based adhesive composition to be crosslinked may be set to arbitrary and appropriate conditions. For example, the cumulative amount of light to be irradiated is preferably 100 mJ / cm ² to 2000 mJ / cm ² .

The support can be, for example, a peeled sheet (separator) or the retardation film.

Examples of the constituent materials of the separator include plastic films such as polyethylene, polypropylene, polyethylene terephthalate, and polyester film; porous materials such as paper, cloth, and non-woven cloth; meshes, foamed sheets, From the viewpoint of excellent surface smoothness, suitable foils and the like such as metal foils and laminates thereof are suitably used as plastic films.

Examples of the plastic film include polyethylene film, polypropylene film, polybutene film, polybutadiene film, polymethylpentene film, polyvinyl chloride film, vinyl chloride copolymer film, and polyethylene terephthalate. Ester film, polybutylene terephthalate film, polyurethane film, ethylene-vinyl acetate copolymer film, etc.

The thickness of the separator is usually 5 to 200 μm, and preferably about 5 to 100 μm. The above-mentioned separators can also be subjected to mold release and antifouling treatment with silicone, fluorine-based, long-chain alkyl-based or fatty acid ammonium-based release agents and silicon dioxide powder, etc. as required, or they can also be coated. Type, kneading type, evaporation type and other antistatic treatment. In particular, by appropriately applying a peeling treatment such as a silicone treatment, a long-chain alkyl treatment, or a fluorine treatment to the surface of the separator, the peelability from the adhesive layer can be further improved.

When the aforementioned adhesive layer is formed on the peeled sheet (separator), the adhesive layer can also be transferred to a retardation film to form the optical film with an adhesive layer of the present invention. At this time, the peeled sheet used to make the aforementioned optical film with an adhesive layer can be directly used as a separator of the optical film with a rubber-based adhesive layer, and the process surface can be simplified.

The thickness of the aforementioned adhesive layer is not particularly limited, and can be appropriately set according to its use, and is preferably 250 μm or less, preferably 100 μm or less, and more preferably 55 μm or less. The lower limit value of the thickness of the adhesive layer is not particularly limited, but from the viewpoint of durability, it is preferably 1 μm or more, and more preferably 5 μm or more.

In addition, the gel fraction of the adhesive layer used in the present invention is not particularly limited, and is preferably about 10 to 98%, more preferably about 25 to 98%, and even more preferably about 45 to 90%. If the gel fraction is in the above range, durability and adhesion can be taken into consideration, so it is suitable. The method for measuring the gel fraction can be measured by the method described in the examples.

(3) The retardation film that functions as a λ / 4 plate with other layers and an adhesive layer with a moisture permeability of 50 g / (m ² ･ day) or less at 40 ° C and 92% RH constitute the organic EL display of the present invention. Optical films for devices, which can be laminated next to each other, and also have other layers between them.

The other layer may be an adhesive layer or an adhesive layer other than the aforementioned adhesive layer (that is, an adhesive layer or an adhesive having a water vapor transmission rate of more than 50 g / (m ²下 day) at 40 ° C and 92% RH) Layers) and interlayers such as a primer layer.

The aforementioned adhesive layer may be formed of an adhesive. The type of the adhesive is not particularly limited, and various substances can be used. The adhesive layer is not particularly limited as long as it is optically transparent. Adhesives in various forms such as water-based, solvent-based, hot-melt, and active energy ray hardening types can be used. Water-based adhesives or active energy ray hardening types can be used as the adhesive. Adhesive is suitable.

In addition, when the retardation film and the adhesive layer are laminated, an easy-adhesion layer may be provided therebetween. The easy-adhesion layer can be formed by, for example, a polyester skeleton, a polyether skeleton, a polycarbonate skeleton, a polyurethane skeleton, a polysiloxane, a polyimide skeleton, a polyimide skeleton, a polyvinyl alcohol skeleton, or the like. Various resins are formed. These polymer resins may be used singly or in combination of two or more kinds. Moreover, you may add another additive when forming an easy adhesion layer. Specifically, stabilizers such as a tackifier, an ultraviolet absorber, an antioxidant, and a heat-resistant stabilizer can be further used.

The optical film of the present invention can be used for an organic EL display device, and can form an anti-reflective film of an organic EL display device (a polarizing film for an organic EL display device) together with a polarizer described later.

2. Polarizing film for organic EL display device The polarizing film for organic EL display device of the present invention is characterized by including a polarizer and the aforementioned optical film for organic EL display device.

The polarizing film for an organic EL display device of the present invention is not particularly limited as long as it contains a polarizer and the aforementioned optical film for an organic EL display device. For example, the polarizing film, the retardation film 3a, and the adhesive layer may be sequentially provided. 2 or a structure including the polarizer, the adhesive layer 2 and the retardation film 3a in this order.

The polarizer 5a can be used as a single-sided protective polarizing film having a protective film on only one side of the polarizer 5a or a double-sided protective polarizing film having a protective film on both sides of the polarizer 5a.

The foregoing configuration of the polarizing film for an organic EL display device of the present invention will be described in further detail with reference to FIG. 3.

When used as a single-sided protective polarizing film 5A containing a polarizer 5a, as shown in FIG. 3 (a), it can be made of a protective film 5b / polarizer 5a / adhesive layer or adhesive layer 4 / phase difference film 3a / adhesive A polarizing film composed of the adhesive layer 2. When used as a double-sided protective polarizing film 5B containing a polarizer 5a, as shown in FIG. 3 (b), the protective film 5b / polarizer 5a / protective film 5b / adhesive layer or adhesive layer 4 / A polarizing film composed of a retardation film 3a / adhesive layer 2.

In the foregoing configuration (only when the retardation film 3a is used), the angle formed by the absorption axis of the polarizer 5a and the slow axis of the retardation film 3a is preferably 35 ° to 55 °, preferably 38 ° to 52 °, and 40 ° ~ 50 ° is better, 42 ° ~ 48 ° is better, and 44 ° ~ 46 ° is even better. If the angle is within this range, the required circular polarizing function can be realized, so it is suitable. In addition, when an angle is mentioned in the present specification, it is mentioned before being specifically noted, and the angle includes an angle in both a clockwise direction and a counterclockwise direction.

In the aforementioned configuration, the case of using the first retardation film 3a only in the series of retardation films, however, as described above, the second retardation film 3b may be used. By then, each of the above components is the protective film 5b / polarizer 5a / adhesive layer or adhesive layer 4 / phase difference film 3a / adhesive layer or adhesive layer 4 / phase difference film 3b / adhesive layer 2, or It is the protective film 5b / polarizer 5a / protective film 5b / adhesive layer or adhesive layer 4 / phase difference film 3a / adhesive layer or adhesive layer 4 / phase difference film 3b / adhesive layer 2.

In the aforementioned configuration (in the case of using the retardation films 3a and 3b), the angle formed by the absorption axis of the polarizer 5a and the slow axis of the first retardation film 3a is preferably 65 ° to 85 °, and preferably 72 ° to 78 ° , 74 ° ~ 76 ° is better. In addition, the angle formed by the absorption axis of the polarizer 5a and the slow axis of the second retardation film 3b is preferably 10 ° to 20 °, 13 ° to 17 ° is more preferable, and 14 ° to 16 ° is more preferable. Arranging the two retardation films at the above-mentioned axial angle is suitable for obtaining a circularly polarizing plate having a very excellent circularly polarizing characteristic (a very excellent anti-reflection characteristic as a result) in a wide frequency range.

Each constituent element used in the polarizing film for an organic EL display device of the present invention will be described below.

(Optical Film for Organic EL Display Device) The optical film for an organic EL display device may be as described above.

(Polarizer) The polarizer is not particularly limited, and various materials can be used. Examples of polarizers include hydrophilic polymer films such as polyvinyl alcohol-based films, partially formalized polyvinyl alcohol-based films, and ethylene / vinyl acetate copolymer-based saponified films that adsorb dichroism of iodine or dichroic dyes. Substances that are uniaxially stretched, and polyene-based alignment films such as dehydrated polyvinyl alcohol or dehydrochlorinated polyvinyl chloride. Among these, a polarizer made of a polyvinyl alcohol-based film and a dichroic material such as iodine is preferable. The thickness of these polarizers is not particularly limited, and is generally about 5 to 80 μm.

A uniaxially-stretched polarizer that dyes a polyvinyl alcohol-based film with iodine can be produced by, for example, immersing polyvinyl alcohol in an iodine aqueous solution to dye and extend it to 3 to 7 times its original length. If necessary, it can be immersed in an aqueous solution such as potassium iodide, which can contain boric acid, zinc sulfate, zinc chloride, and the like. If necessary, the polyvinyl alcohol film can be immersed in water and washed with water before dyeing. By washing the polyvinyl alcohol-based film with water, dirt and an anti-adhesive agent on the surface of the polyvinyl alcohol-based film can be cleaned. In addition, the polyvinyl alcohol-based film can swell to prevent unevenness such as staining. The stretching may be performed after dyeing with iodine, and may be performed while dyeing, or may be performed after dyeing with iodine. Extension can also be performed in an aqueous solution such as boric acid or potassium iodide or in a water bath.

From the viewpoint of thin film formation, it is preferable to use a thin polarizer having a thickness of 15 μm or less, and it is preferable to use a thin polarizer having a thickness of 10 μm or less. From the viewpoint of thinning, the thickness is preferably 1 to 7 μm. This type of thin polarizer has little uneven thickness, good visibility, and little dimensional change, so it has good durability. Furthermore, the thickness as a polarizing film can be expected to be thinner, which is quite suitable.

Representatives of thin polarizers include Japanese Patent Laid-Open No. 51-069644, Japanese Patent Laid-Open No. 2000-338329, International Publication No. 2010/100917, Japanese Patent Laid-Open No. 2014-59328, and Japanese Patent Laid-Open No. 2012- A thin polarizing film described in Japanese Patent No. 73563. These thin polarizing films can be produced by a method including a step of stretching a polyvinyl alcohol resin (hereinafter also referred to as a PVA resin) layer and a resin substrate for stretching in the state of a laminate and a dyeing step. In this manufacturing method, even if the PVA-based resin layer is very thin, it can be stretched by the support of the stretching resin base material, and does not cause problems such as breakage due to stretching.

From the viewpoint of still being able to stretch at high magnification and improve polarizing performance in a manufacturing method including a step of stretching in the state of a laminated body and a dyeing step, the aforementioned thin polarizing film is, for example, International Publication No. 2010/100917, or Japanese Patent Application Laid-Open It is described in Japanese Unexamined Patent Publication No. 2014-059328 and Japanese Unexamined Patent Publication No. 2012-073563 that it is suitable to be prepared by a method that includes a step of stretching in a boric acid aqueous solution; especially, Japanese Unexamined Patent Publication No. 2014-059328 and Japanese Unexamined Patent Application No. It is described in the 2012-073563 publication that it is suitable to be produced by a production method including a step of auxiliaryly extending in the air before extending in an aqueous boric acid solution.

(Protective film) The material used to form the protective film provided on one or both sides of the aforementioned polarizer should preferably have excellent transparency, mechanical strength, thermal stability, moisture barrier properties, isotropic properties, and the like. Examples include polyester polymers such as polyethylene terephthalate and polyethylene naphthalate, cellulose polymers such as diethyl cellulose and triethyl cellulose, and polymethyl methacrylate. Acrylic polymers such as esters, styrene polymers such as polystyrene and acrylonitrile-styrene copolymer (AS resin), polycarbonate polymers, etc. In addition, examples of the polymer forming the aforementioned protective film include polyethylene, polypropylene, a polyolefin having a ring system or a norbornene structure, a polyolefin polymer of an ethylene / propylene copolymer, and a vinyl chloride polymer. Fluorene-based polymers such as nylon, aromatic polyfluorene, fluorene-based polymers, fluorene-based polymers, polyether fluorene-based polymers, polyetheretherketone-based polymers, polyphenylene sulfide-based polymers, Vinyl alcohol polymers, vinylidene chloride polymers, vinyl butyral polymers, aryl ester polymers, polyoxymethylene polymers, epoxy polymers, or mixtures of the aforementioned polymers, etc. . The protective film can also be formed as a hardened layer of a thermosetting and ultraviolet curing resin such as acrylic, urethane, urethane, epoxy, or silicone. When protective films are provided on both sides of the polarizer, a protective film made of the same polymer material can be used on the front and back sides, or a protective film made of different polymer materials can be used.

The thickness of the protective film can be appropriately determined. Generally, it is about 1 to 500 μm from the viewpoints of workability such as strength, handling, and film properties.

The polarizer and the protective film are usually adhered to each other through a water-based adhesive or the like. Examples of the water-based adhesive include an isocyanate-based adhesive, a polyvinyl alcohol-based adhesive, a gelatin-based adhesive, a vinyl-based latex, an aqueous polyurethane, and an aqueous polyester. In addition to the above, examples of the adhesive for the polarizer and the protective film include an ultraviolet curing adhesive, an electron beam curing adhesive, and the like. The adhesive for electron beam-curable polarizing films can exhibit good adhesion to the above various protective films. The adhesive used in the present invention may contain a metal compound filler.

For the surface of the protective film that is not attached to the polarizer, a hard coating or anti-reflection treatment may be performed or a treatment for the purpose of anti-adhesion, diffusion and anti-glare.

(Adhesive layer or adhesive layer) The adhesive layer or adhesive layer 4 for adhering the polarizing film 5 and the retardation film 3a or adhering the retardation film 3a and the retardation film 3b is not particularly limited, and this specification can be appropriately used Recorded in. Specifically, the retardation film 3a and the retardation film 3b are followed. For example, an acrylic adhesive using a (meth) acrylic polymer as a base polymer has good optical transparency, and exhibits moderate wettability and cohesiveness. It is suitable because it has excellent adhesive properties and excellent weather resistance and heat resistance. The polarizing film 5 and the retardation film 3 a can be exemplified by the aforementioned water-based adhesive for adhering a polarizer and a protective film, and specifically, a polyvinyl alcohol-based adhesive is preferable.

(Other layers) The polarizing film for an organic EL display device of the present invention may include an interposer layer or an easy-adhesion layer such as an adhesive layer, an adhesive layer, or a primer layer other than the foregoing. Examples of the interposer or the easy-adhesive layer are as described above.

A functional layer can be provided on the polarizing film for an organic EL display device of the present invention. The provision of the functional layer is suitable because it can suppress the generation of defects such as penetrating cracks and nano slits in polarizers. The functional layer may be formed of various forming materials. The functional layer can be formed, for example, by applying a resin material to a polarizer.

Examples of the resin material forming the functional layer include polyester resins, polyether resins, polycarbonate resins, polyurethane resins, silicone resins, polyamide resins, and polyimines. Resin, PVA resin, acrylic resin, etc. These resin materials may be used singly or in combination of two or more kinds. Among them, one is selected from the group consisting of a polyurethane resin and a polyvinyl alcohol (PVA) resin. More than one species is preferred, and PVA-based resins are preferred. The form of the resin may be either water-based or solvent-based. The form of the resin is preferably a water-based resin, and preferably a PVA-based resin. As the aqueous resin, an acrylic resin aqueous solution or a urethane resin aqueous solution can be used.

The aforementioned functional layer is too thick, and the optical reliability and water resistance will decrease. Therefore, the thickness of the functional layer should be 15 μm or less, 10 μm or less, 8 μm or less, 6 μm or less, 5 μm or less, and 3 μm or less. On the other hand, the thickness of the functional layer is preferably 0.2 μm or more, more preferably 0.5 μm or more, and more preferably 0.7 μm or more. The use of the functional layer having such a thickness is suitable because cracks can be suppressed.

From the viewpoint of thinning, the total thickness of the aforementioned polarizing film (including an interposer and a functional layer in addition to the polarizer and the transparent protective film) is preferably 3 to 115 μm, preferably 43 to 60 μm, and more preferably 14 to 48 μm.

The polarizing film for an organic EL display device of the present invention uses the aforementioned optical film for an organic EL display device, and therefore has excellent low moisture permeability. Since the polarizing film for an organic EL display device of the present invention is bonded to an organic EL element through the aforementioned adhesive layer 2, the aforementioned adhesive layer 2 is arranged near the organic EL element, which can sufficiently prevent moisture and the like from entering the organic EL element. .

3. Polarizing film with adhesive layer for organic EL display device The polarizing film with adhesive layer of the present invention is characterized in that it has an adhesive layer on the polarizer side of the aforementioned polarizing film for organic EL display device.

As shown in FIG. 4, the polarizing film 8 with an adhesive layer for an organic EL display device of the present invention is an adhesive layer 7 on the polarizing film 5 side of the polarizing film 6 for an organic EL display device of the present invention.

Examples of the polarizing film for an organic EL display device include the foregoing.

The said adhesive layer 7 is not specifically limited, A well-known thing can be used. Moreover, the said adhesive layer can also use the said low moisture-permeable adhesive layer. Specifically, such an adhesive layer can be appropriately selected and used, for example, a (meth) acrylic polymer, a silicone polymer, a polyester, a polyurethane, a polyamide, a polyether, a fluorine-based polymer, or a rubber-based polymer. Other polymers as the base polymer. Among these, the acrylic adhesive with (meth) acrylic polymer as the base polymer has good optical transparency, exhibits moderate wettability, cohesiveness, and adhesive properties, and has weather resistance and heat resistance. It is suitable because it is excellent.

The (meth) acrylic polymer is not particularly limited, and examples thereof include those obtained by polymerizing a monomer component containing an alkyl (meth) acrylate having an alkyl group having 4 to 24 carbon atoms at the end of the ester group. The term “alkyl (meth) acrylate” refers to an alkyl acrylate and / or an alkyl methacrylate. The meaning of the term “(meth)” in the present invention is the same.

Examples of the (meth) acrylic acid alkyl ester include a linear or branched alkyl group having 4 to 24 carbon atoms. From the viewpoint of easy balance of the adhesive properties, a linear or branched An alkyl (meth) acrylate having an alkyl group having 4 to 9 carbon atoms is preferred. These alkyl (meth) acrylates may be used individually by 1 type, and may use 2 or more types together.

The monomer component forming the (meth) acrylic polymer may contain a comonomer other than the aforementioned (meth) acrylic acid alkyl ester as a monofunctional monomer component. Examples of such a comonomer include a cyclic nitrogen-containing monomer, a hydroxyl-containing monomer, a carboxyl-containing monomer, and a monomer having a cyclic ether group.

In addition, in order to adjust the cohesive force of the adhesive, the monomer component forming the (meth) acrylic polymer may contain a polyfunctional monomer in addition to the monofunctional monomer as required. The polyfunctional monomer is a monomer having at least two polymerizable functional groups having an unsaturated double bond such as a (meth) acrylfluorene group or a vinyl group, and examples thereof include dipentaerythritol hexa (meth) acrylic acid. Ester, 1,6-hexanediol di (meth) acrylate, trimethylolpropane tri (meth) acrylate. A polyfunctional monomer may be used individually by 1 type, and may be used in combination of 2 or more type.

The production of such a (meth) acrylic polymer can be appropriately selected from known production methods such as radiation polymerization such as solution polymerization and ultraviolet polymerization, block polymerization, and emulsion polymerization. The obtained (meth) acrylic polymer may be any of a random copolymer, a block copolymer, a graft copolymer, and the like.

A polymerization initiator, a chain transfer agent, an emulsifier, and the like that can be used for radical polymerization are not particularly limited, and known substances generally used in the art can be appropriately selected and used. The weight-average molecular weight of the (meth) acrylic polymer can be controlled by the amount of polymerization initiator, chain transfer agent used, and reaction conditions, and the amount used can be appropriately adjusted according to these types.

The weight average molecular weight of the (meth) acrylic polymer used in the present invention is preferably 400,000 to 4 million. When the weight average molecular weight is more than 400,000, the durability of the adhesive layer can be satisfied, or the cohesive force of the adhesive layer can be reduced to reduce the occurrence of adhesive residue. On the other hand, when the weight average molecular weight is more than 4 million, the adhesiveness tends to decrease. In addition, the viscosity of the adhesive in the solution system may become too high to be difficult to apply. The weight average molecular weight refers to a value measured by GPC (gel permeation chromatography) and calculated in terms of polystyrene. As for the (meth) acrylic polymer obtained by radiation polymerization, it is difficult to measure molecular weight.

The adhesive composition used in the present invention may contain a crosslinking agent. Examples of the crosslinking agent include isocyanate-based crosslinking agents, epoxy-based crosslinking agents, polysiloxane-based crosslinking agents, Crosslinking agents such as oxazoline-based crosslinking agents, acrylpropane-based crosslinking agents, silane-based crosslinking agents, alkyl etherified melamine-based crosslinking agents, metal chelate-based crosslinking agents, peroxides, etc. They can be used singly or in combination of two or more kinds. As said crosslinking agent, an isocyanate-type crosslinking agent and an epoxy-type crosslinking agent are used suitably.

The above-mentioned crosslinking agents may be used singly or in combination of two or more kinds, but in terms of the overall content, it is preferably contained in the range of 0.01 to 10 parts by weight relative to 100 parts by weight of the aforementioned (meth) acrylic polymer. The aforementioned crosslinking agent.

In order to improve adhesion, the adhesive composition used in the present invention may contain a (meth) acrylic oligomer. In addition, when the adhesive layer is applied to a hydrophilic adherend such as glass, in order to improve the water resistance of the interface, the adhesive composition used in the present invention may contain a silane coupling agent.

In addition, the adhesive composition used in the present invention may contain other known additives, for example, polyether compounds such as polyalkylene glycol such as polypropylene glycol, powders such as colorants, pigments, dyes, Surfactants, plasticizers, tackifiers, surface lubricants, leveling agents, softeners, antioxidants, anti-aging agents, light stabilizers, UV absorbers, polymerization inhibitors, inorganic or organic fillers, metal powders, Granules, foils, etc. In addition, a redox system with a reducing agent can be used within a controllable range.

The formation method of the adhesive layer 7 can be performed by a well-known method.

4. Organic EL display device The organic EL display device of the present invention is characterized by having the aforementioned polarizing plate for an organic EL display device or the aforementioned polarizing plate with an adhesive layer.

The organic EL display device of the present invention includes the polarizing plate for an organic EL display device of the present invention or a polarizing plate with an adhesive layer, and can be bonded to an organic EL element through the aforementioned adhesive layer 2. Other structures of the organic EL display device of the present invention may be the same as those of the conventional organic EL display device.

Since the organic EL display device of the present invention includes the polarizing plate for an organic EL display device or the polarizing plate with an adhesive layer, the organic EL display device has high optical reliability. Examples

Hereinafter, the present invention will be specifically described with examples, but the present invention is not limited by these examples. In addition, the parts and symbols in each example are based on weight.

Production Example 1 (Production of first retardation film) 37.5 parts by mass of isosorbide (ISB), 91.5 parts by mass of 9,9-bis [4- (2-hydroxyethoxy) phenyl] fluorene (BHEPF), average 8.4 parts by mass of polyethylene glycol (PEG) with a molecular weight of 400, 105.7 parts by mass of diphenyl carbonate (DPC), and 0.594 parts by mass of cesium carbonate (0.2% by mass aqueous solution) as a catalyst were put into a reaction vessel, respectively, under a nitrogen atmosphere Set the temperature of the heating medium in the reaction vessel to 150 ° C and stir as needed to melt the raw materials, as the first step of the reaction (about 15 minutes).

Then, the pressure in the reaction vessel was changed from normal pressure to 13.3 kPa, and the temperature of the heating medium in the reaction vessel was raised to 190 ° C. in one hour, so that the generated phenol was discharged out of the reaction vessel. After the temperature in the reaction vessel was maintained at 190 ° C for 15 minutes, the pressure in the reaction vessel was changed to 6.67 kPa, and the temperature of the heating medium in the reaction vessel was raised to 230 ° C in 15 minutes, and the generated phenol was discharged to the reaction vessel. Also, as a second stage step. The stirring torque of the stirrer will increase, so in order to raise the temperature to 250 ° C in 8 minutes to further eliminate the generated phenol, the pressure in the reaction vessel is reduced to less than 0.200 kPa. When the predetermined stirring torque is reached, the reaction is ended, the resulting reactant is squeezed into water, and granulated to obtain BHEPF / ISB / PEG = 42.9 mole% / 52.8 mole% / 4.3 mole% The polycarbonate resin A contains a structural unit derived from a dihydroxy compound. The obtained polycarbonate resin A had a glass transition temperature of 126 ° C and a reduction viscosity of 0.372 dL / g. After the polycarbonate resin A obtained was vacuum-dried at 80 ° C for 5 hours, it was equipped with a uniaxial extruder (screw diameter: 25mm, drum set temperature: 220 ° C, manufactured by Isuzu Chemical Industries, Ltd.), and a T-die. (Width: 300mm, set temperature: 220 ° C), chill roll (set temperature: 120 ~ 130 ° C), and film forming device of the coiler to produce a polycarbonate resin film with a length of 3m, a width of 300mm, and a thickness of 120 μm. The obtained polycarbonate resin film had a water absorption of 1.2%.

The obtained polycarbonate resin film was cut to a length of 300 mm and a width of 300 mm, and was then longitudinally stretched at a temperature of 136 ° C at a magnification of 2 times using Lab-Stretcher KARO IV (manufactured by Bruckner) to obtain a retardation film. Re (550) of the obtained retardation film was 141 nm, and Rth (550) was 141 nm (nx: 1.5969, ny: 1.5942, nz: 1.5942), and exhibited a refractive index characteristic of nx> ny = nz. In addition, the Re (450) / Re (550) of the obtained retardation film was 0.89 (in addition, the retardation change due to environmental tests was 5 nm).

Production Example 2 (Production of the second retardation layer (second retardation film)) The following chemical formula (I) (the numbers 65 and 35 in the formula represents the mole% of the monomer unit, which is conveniently displayed as a block polymer body (Weight average molecular weight: 5000), 20 parts by weight of a side chain liquid crystal polymer, 80 parts by weight of a polymerizable liquid crystal (trade name: Paliocolor LC242, manufactured by BASF) and a photopolymerization initiator (trade name) : IRGACURE 907, manufactured by Ciba Specialty Chemicals) 5 parts by weight was dissolved in 200 parts by weight of cyclopentanone to prepare a liquid crystal coating liquid. Then, this coating liquid was applied to a substrate film (norbornene-based resin film, trade name: ZEONEX, manufactured by Japan Zeon Co., Ltd.) with a bar coater, and then dried by heating at 80 ° C for 4 minutes to The liquid crystal is aligned. The liquid crystal layer was irradiated with ultraviolet rays to harden the liquid crystal layer to form a liquid crystal cured layer (thickness: 0.58 μm) as a second retardation layer on the substrate. Re (550) of this layer is 0 nm, Rth (550) is -71 nm (nx: 1.5326, ny: 1.5326, nz: 1.6550), and exhibits a refractive index characteristic of nz> nx = ny.

[Chemical Formula 14]

Production Example 3 (Production of retardation film A) The first retardation film obtained in Production Example 1 was bonded to the second retardation layer (liquid crystal cured layer) obtained in Production Example 2 through an acrylic adhesive, and then the substrate film was removed to obtain A laminated body (a retardation film A) of a liquid crystal cured layer is transferred onto the first retardation film. The obtained retardation film A is composed of a first retardation film / acrylic adhesive layer / second retardation layer. Re (550) of the obtained retardation film A was 141 nm, and Rth (550) was 70 nm.

Manufacturing Example 4 (Production of retardation film B) A long norbornene-based resin film (trade name: ZEONOR, thickness: 50 μm, manufactured by Japan Zeon Corporation) was extended by 1.52 times to obtain a phase difference of Re (550) of 140 nm Film B (thickness: 35 μm).

Manufacturing Example 5 (Production of retardation film C) Using retardation film A as a substrate, a sputtering target containing Al, SiO ₂ and ZnO was used on a first retardation film of the aforementioned substrate by DC magnetron sputtering. A first oxide layer (thickness: 30 nm) was formed. Next, using a Si target, a second oxide layer (thickness: 50 nm) was formed on the first oxide layer of the substrate / first oxide laminate. In this manner, a retardation film C having a configuration of a second retardation layer / acrylic adhesive layer / a first retardation film / a first oxide layer (AZO) / a second oxide layer (SiO ₂ ) was produced.

Manufacturing Example 6 (Production of optical film laminate) A laminate having a 9 μm-thick polyvinyl alcohol (PVA) layer was formed on an amorphous polyethylene terephthalate (PET) substrate at an elongation temperature of 130 ° C. Use air-assisted extension to generate extended laminates. After dyeing the extension laminated body to generate a colored laminated body, the colored laminated body is extended at a stretching temperature of 65 ° C. using boric acid water to generate a total extension ratio of 5.94 times, which includes an integral extension with the amorphous PET substrate. An optical film laminate with a PVA layer having a thickness of 5 μm. By using this two-stage extension, the PVA molecules forming a PVA layer formed on an amorphous PET substrate have a high-dimensional orientation, and the iodine adsorbed by dyeing is high in the form of a polyiodide ion complex. The high-performance polarizing film (polarizing member) aligned in two dimensions is used to form an optical film laminate including a PVA layer with a thickness of 5 μm.

Production Example 7 (Preparation of Rubber-Based Adhesive Composition) 100 parts by weight of polyisobutylene (trade names: OPPANOL B80, Mw: approximately 750,000, manufactured by BASF), and tricyclodecanedi as a polyfunctional radical polymerizable compound 5 parts by weight of methanol diacrylate (trade name: NK Ester A-DCP, bifunctional acrylate, molecular weight: 304, manufactured by Shin Nakamura Chemical Industry Co., Ltd.), a diphenyl ketone (and A toluene solution (adhesive solution) obtained by blending 0.5 parts of Kopure Pharmaceutical Co., Ltd. and 10 parts by weight of completely hydrogenated terpene was adjusted to a solid content of 15% by weight, and a rubber-based adhesive composition (solution ).

Production Example 8 (Production of rubber-based adhesive composition) 100 parts by weight of polyisobutylene (trade names: OPPANOL B80, Mw: about 750,000, manufactured by BASF), and tricyclodecanedi as a polyfunctional radical polymerizable compound 10 parts by weight of methanol diacrylate (trade name: NK Ester A-DCP, bifunctional acrylate, molecular weight: 304, manufactured by Shin Nakamura Chemical Industry Co., Ltd.), diphenyl ketone (and A toluene solution (adhesive solution) obtained by blending 0.5 parts of Kopure Pharmaceutical Co., Ltd. and 10 parts by weight of completely hydrogenated terpene was adjusted to a solid content of 15% by weight, and a rubber-based adhesive composition (solution ).

Production Example 9 (Preparation of acrylic adhesive composition) In a separate flask provided with a thermometer, a stirrer, a reflow cooling tube, and a nitrogen introduction tube, 99 parts by weight of butyl acrylate (BA) as a monomer component, and 4-hydroxybutyl acrylate were charged. After 1 part by weight of ester (4HBA), 0.2 parts by weight of azobisisobutyronitrile as a polymerization initiator, and ethyl acetate as a polymerization solvent with a solid content of 20%, pour nitrogen into it and stir for about 1 hour. Nitrogen substitution. Thereafter, the flask was heated to 60 ° C. and reacted for 7 hours to obtain an acrylic polymer having a weight average molecular weight (Mw) of 1.1 million. To the acrylic polymer solution (100 parts by weight of solid content), 0.8 part by weight of trimethylolpropane methylphenyl diisocyanate (trade name: Coronate L, manufactured by Nippon Polyurethane Industry (stock)) as an isocyanate-based crosslinking agent was added. 0.1 parts by weight of a silane coupling agent (trade name: KBM-403, manufactured by Shin-Etsu Chemical Co., Ltd.) to prepare an acrylic adhesive composition.

(Preparation of acrylic adhesive layer) The acrylic adhesive composition obtained above was applied to a 38 μm thick polyester film (trade name: DIAFOIL MRF, manufactured by Mitsubishi Resins Co., Ltd.) which had been peeled off with polysiloxane on one side. ) To form a coating layer. Next, the coating layer was dried at 120 ° C. for 3 minutes to form an adhesive layer to prepare an adhesive sheet having an adhesive layer thickness of 50 μm. In addition, a 38 μm thick polyester film (trade name: DIAFOIL MRF, manufactured by Mitsubishi Resins Co., Ltd.) that had been peeled with polysiloxane on one side was pasted so that the peeled surface was in contact with the adhesive layer. The acrylic adhesive sheet was obtained by bonding to the adhesive surface of the adhesive sheet. The polyester film coated on both sides of the adhesive layer can be used as a release liner (separator).

Example 1 (Preparation of Adhesive Sheet) A 38 μm-thick polyester film (trade name: DIAFOIL MRF, Mitsubishi) coated with the rubber-based adhesive composition (solution) obtained in Production Example 7 was peeled off with polysiloxane on one side. Resin (made from a resin)) to form a coating layer. Next, the coating layer was dried at 80 ° C. for 3 minutes to form an adhesive layer to prepare an adhesive sheet having an adhesive layer thickness of 50 μm. In addition, a 38 μm thick polyester film (trade name: DIAFOIL MRF, manufactured by Mitsubishi Resins Co., Ltd.) that had been peeled with polysiloxane on one side was pasted so that the peeled surface was in contact with the adhesive layer. Close to the adhesive side of the adhesive sheet. The polyester film coated on both sides of the adhesive layer can be used as a release liner (separator).

The other separator was peeled, and ultraviolet rays were irradiated from the side of the peeled separator at room temperature to obtain an adhesive sheet composed of a rubber-based adhesive layer / separator. The aforementioned ultraviolet irradiation has a light amount of 1000 mJ / cm ² in the UVA region.

(Production of a retardation film with an adhesive layer) The second retardation layer of the retardation film A obtained in Manufacturing Example 3 was bonded to the rubber-based adhesive sheet obtained above to obtain a retardation film A / rubber-based adhesive layer / Laminated body composed of separated pieces.

(Production method of polarizing film) On the surface of the polarizing film (polarizing element, thickness: 5 μm) of the optical film laminate obtained in Production Example 6, a polyvinyl alcohol-based adhesive was applied so that the thickness of the adhesive layer was 0.1 μm, and pasted A protective film (triethylammonium cellulose (TAC) film (trade name: KC4UYW, thickness: 40 μm, manufactured by Konica Minolta)) was dried at 50 ° C. for 5 minutes. Then, the amorphous PET substrate was peeled to produce A single-sided protective polarizing film using a thin polarizer. The phase difference film A of the aforementioned laminated body is bonded to the polarizing film side of the obtained single-sided protective polarizing film through a polyvinyl alcohol-based adhesive. A synthetic retardation film is attached here The slow axis of A is 45 ° counterclockwise with respect to the absorption axis of the polarizer. The obtained polarizing film has a TAC film / adhesive layer / polarizer / adhesive layer / phase retardation film A / rubber-based adhesive layer / separator The structure of the composition.

Example 2 (Production of retardation film with adhesive layer) A retardation film B / rubber-based adhesive layer was prepared in the same manner as in Example 1 except that the retardation film B obtained in Production Example 4 was used as the retardation film. / Laminated body composed of separate parts.

(Production method of polarizing film) A polarizing film was produced in the same manner as in Example 1 except that the laminated body obtained above was used. The obtained polarizing film has a structure consisting of a TAC film / adhesive layer / polarizer / adhesive layer / phase difference film B / rubber-based adhesive layer / separator.

Comparative Example 1 (Producing a retardation film with an adhesive layer) A retardation film A / acrylic was produced in the same manner as in Example 1 except that the acrylic adhesive layer obtained in Production Example 9 was used instead of the rubber-based adhesive layer. Laminated body consisting of an adhesive layer / separator.

(Production method of polarizing film) A polarizing film was produced in the same manner as in Example 1 except that the laminated body obtained above was used. The obtained polarizing film has a structure composed of a TAC film / adhesive layer / polarizer / adhesive layer / phase difference film A / acrylic adhesive layer / separator.

The following measurements were performed using the adhesive composition, the laminate, or the polarizing film obtained in the examples and comparative examples. The evaluation results are shown in Table 1.

<Measurement of the moisture permeability of the adhesive layer> A triethyl cellulose film (TAC film, thickness: 25 μm, made by Konica Minolta) was bonded to the adhesive sheet obtained in Examples and Comparative Examples (adhesive layer thickness: 50 μm). ) 'S adhesive surface. Then, the release liner of the adhesive sheet was peeled, and the measurement sample was obtained. Next, using this sample for measurement, the water vapor transmission rate (water vapor transmission rate) was measured by the water vapor transmission test method (cup method according to JIS Z 0208) under the following conditions. Measurement temperature: 40 ° C Relative humidity: 92% Measurement time: 24 hours A constant temperature and humidity bath was used for the measurement.

<Measurement of the moisture permeability of the retardation film with an adhesive layer> A separator was peeled from the laminated body obtained in the Example and the comparative example 1, the adhesive surface was exposed, and it was set as the sample for a measurement. Next, using this sample for measurement, the water vapor transmission rate (water vapor transmission rate) was measured by the water vapor transmission test method (cup method according to JIS Z 0208) under the following conditions. Measurement temperature: 40 ° C Relative humidity: 92% Measurement time: 24 hours A constant temperature and humidity bath was used for the measurement.

<Durability> After peeling off the separator of the polarizing film with an adhesive layer obtained in Examples and Comparative Examples, bonding the test piece to a glass plate, and putting it in an environment of 85 ° C for 300 hours, the naked eye or a magnifying glass (20 Times) to observe its state. Evaluation was performed by the following evaluation criteria. ：: It was confirmed with a magnifying glass that no adverse conditions (foaming, peeling, etc.) occurred. ○: No adverse condition was observed with the naked eye, but it was confirmed under the magnifying glass that there was an adverse condition to such an extent that it was not a problem in use. ×: An unfavorable condition was observed with the naked eye.

<Viewing Angle Characteristics> The polarizing films obtained in the examples and comparative examples were cut into a size of 50 mm × 50 mm. The organic EL panel was taken out from the organic EL display (product name: 15EL9500, manufactured by LG), the polarizing film attached to the organic EL panel was peeled, and the cut polarizing film was attached instead to obtain an organic EL panel. The measurement results of the reflection hue of the organic EL panel are shown in the table. In addition, the "viewing angle characteristic" indicates the distance Δxy between two points of the reflection hue in the front direction and the reflection hue in the oblique direction (the maximum or minimum value of the polar angle 45 °) on the xy chromaticity diagram of the CIE standard color system. A black image was displayed on the obtained organic EL panel, and the reflection hue was measured using a cone lens for a viewing angle measurement and evaluation device made by Auoronic-MERCHERS. (Circle): 0.07 or less, reflection characteristics are favorable, and it can be used as an organic EL device. ×: Below 0.07, the reflection characteristics are not good, and it cannot be used as an organic EL device.

[Table 1]

The entries in Table 1 are as follows. <Rubber-based polymer> OPPANOL B80: Polyisobutylene (Mw: about 750,000, manufactured by BASF) <Acrylic polymer> Acrylic adhesive composition obtained in Production Example 9 <Polyfunctional radical polymerizable compound> A-DCP : Tricyclodecane dimethanol diacrylate (trade name: NK Ester A-DCP, bifunctional acrylate, molecular weight: 304, manufactured by Shin Nakamura Chemical Industry Co., Ltd.) <photopolymerization initiator> diphenyl ketone: Hydrogen-type photopolymerization initiator <viscous agent> Fully hydrogenated terpene: Fully hydrogenated terpene with a softening point of 160 ° C and a hydroxyl value of 60

1‧‧‧Optical film for organic EL display device
2‧‧‧ Adhesive layer
3a‧‧‧ retardation film functioning as a λ / 4 plate (first retardation film)
3b‧‧‧ retardation film functioning as a λ / 2 plate (second retardation film)
4‧‧‧ Adhesive layer or adhesive layer
5A‧‧‧Single-sided protective polarizing film
5B‧‧‧ Double-sided protective polarizing film
5a‧‧‧Polarizer
5b‧‧‧protective film
6‧‧‧Polarizing film for organic EL display device
7‧‧‧ Adhesive layer
8‧‧‧ Polarizing film with adhesive layer for organic EL display device

FIG. 1 is a cross-sectional view schematically showing an embodiment of an optical film for an organic EL display device of the present invention. FIG. 2 is a cross-sectional view schematically showing an embodiment of an optical film for an organic EL display device of the present invention. 3 (a) is a cross-sectional view schematically showing an embodiment of a polarizing film for an organic EL display device of the present invention. (b) is a sectional view schematically showing an embodiment of a polarizing film for an organic EL display device of the present invention. 4 is a cross-sectional view schematically showing an embodiment of a polarizing film with an adhesive layer for an organic EL display device of the present invention.

1‧‧‧Optical film for organic EL display device

2‧‧‧ Adhesive layer

3a‧‧‧ retardation film functioning as a λ / 4 plate (first retardation film)

Claims (8)

An optical film for an organic EL display device, which is characterized by having a retardation film and an adhesive layer functioning as a λ / 4 plate, and the moisture permeability of the adhesive layer at 40 ° C and 92% RH is 50 g / (m ² ･ day) or less. The optical film for an organic EL display device according to claim 1, wherein the adhesive layer is an adhesive layer formed of a rubber-based adhesive composition containing polyisobutylene and a hydrogen-abstracting photopolymerization initiator. A polarizing film for an organic EL display device, comprising a polarizer and an optical film for an organic EL display device according to claim 1 or 2. The polarizing film for an organic EL display device according to claim 3, wherein the thickness of the polarizer is 15 μm or less. For example, a polarizing film for an organic EL display device according to claim 3 or 4 includes the aforementioned polarizer, a retardation film functioning as a λ / 4 plate, and an adhesive layer in this order, and the adhesive layer is at 40 ° C, The moisture permeability at 92% RH is less than 50g / (m ² ･ day). For example, the polarizing film for an organic EL display device according to claim 3 or 4 includes the aforementioned polarizer, an adhesive layer, and a retardation film functioning as a λ / 4 plate in this order, and the adhesive layer is at 40 ° C, The moisture permeability at 92% RH is less than 50g / (m ² ･ day). A polarizing film with an adhesive layer for an organic EL display device is characterized in that it further has an adhesive layer on the polarizer side of the polarizing film for an organic EL display device according to any one of claims 3 to 6. An organic EL display device comprising a polarizing film for an organic EL display device according to any one of claims 3 to 6 or a polarizing film with an adhesive layer for an organic EL display device according to claim 7.