TWI744308B - 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 - Google Patents

Abstract

The present invention is an optical film for an organic EL display device, which is characterized by having a retardation film functioning as a λ/4 plate and an adhesive layer, and the moisture permeability of the adhesive layer at 40°C and 92%RH Less than 50g/(m ² ･day). The optical film for an organic EL display device of the present invention does not need to form a barrier layer made of an inorganic substance formed by vapor deposition or the like, that is, it has better low moisture permeability.

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 organic EL display devices. Furthermore, the present invention relates to a polarizing film for an organic EL display device containing a polarizer and the aforementioned optical film for an organic EL display device, and an adhesive layer for an organic EL display device in which the polarizing film for an organic EL display device is further provided with an adhesive layer. Polarizing film for adhesive layer. In addition, the present invention relates to an organic EL display device using the aforementioned polarizing film for an organic EL display device or a 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 gradually been widely used in various applications such as mobile phones, car navigation devices, personal computer monitors, and televisions. Generally, 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 polarizing plate 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 circularly polarizing plate generally uses a laminate of a polarizing plate and a λ/4 plate, for example, it is known that a polarizer and a two-layer retardation layer with specific refractive index characteristics are laminated (for example, refer to Patent Document 1).

The organic EL element mounted on the aforementioned organic EL display device is very inferior to the moisture and oxygen in the atmosphere. Therefore, a barrier layer or an optical film with barrier function is usually provided on the surface of the organic EL panel. In addition, low moisture permeability is also important. Moisture, etc. will not penetrate the optical films constituting the organic EL display device or the adhesive layer used for bonding them.

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

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 that can suppress changes in viewing angle characteristics and display characteristics. However, there is no discussion on imparting low moisture permeability to optical films such as retardation films.

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

In view of this, the 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 vapor deposition or the like and has better low moisture permeability. In addition, the object of the present invention is also to provide a polarizing film for an organic EL display device containing a polarizer and the aforementioned optical film for an organic EL display device, and an organic EL display device having the aforementioned polarizing film for an organic EL display device and an adhesive layer Polarizing film with adhesive layer. In addition, the present invention also aims to provide an organic EL display device using the aforementioned polarizing film for an organic EL display device or a polarizing film with an adhesive layer for an organic EL display device. Means to solve the problem

The inventors of the present invention have found the following optical film for organic EL display devices as a result of intensive research in order to solve the aforementioned problems, and even 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 functioning as a λ/4 plate and an adhesive layer, and the adhesive layer is at 40°C and 92%RH. The moisture permeability is below 50g/(m ² ･day).

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

In addition, the present invention relates to a polarizing film for an organic EL display device, which is characterized by containing a polarizer and the aforementioned optical film for an organic EL display device.

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

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

In addition, the present invention relates to an adhesive layer-attached polarizing film for organic EL display devices, which is characterized in that it further has an adhesive layer on the polarizer side of the aforementioned polarizing film for organic EL display devices.

In addition, the present invention relates to an organic EL display device characterized by having the aforementioned polarizing film for the organic EL display device or the aforementioned polarizing film with an adhesive layer for the organic EL display device. Invention effect

The optical film for the organic EL display device of the present invention has a retardation film and an adhesive layer with a specific moisture permeability, without forming a barrier layer made of inorganic substances formed by evaporation or the like, and can exhibit excellent low permeability Wetness. The optical film for an organic EL display device of the present invention can be combined with a polarizer to form an anti-reflection film for an organic EL display device (polarizing film for an organic EL display device). In addition, the optical film for an organic EL display device of the present invention is also quite advantageous in terms of cost.

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

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

Mode 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 functioning as a λ/4 plate and an adhesive layer, and the adhesive The moisture permeability of the agent layer at 40°C and 92%RH is below 50g/(m ² ･day).

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 3a that functions as a λ/4 plate. Fig. 1 shows a form in which the adhesive layer 2 is provided on only 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 depicts the state in which the constituent elements are layered together, but the present invention is not limited to this state, and other layers may be contained between the aforementioned layers. The same applies to Figures 2~4.

In addition, 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 in addition to a retardation film 3a (sometimes referred to as a first retardation film) that functions as a λ/4 plate. 2 retardation film 3b. Specifically, it is composed of (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 optical film for the aforementioned organic EL display device is preferably 50g/(m ² ･day) or less, ^{preferably 30g/(m 2} ･day) or less, more preferably 20g/(m ² ･day) or less, 15g/( m ² ･day) or less is particularly preferred. In addition, the lower limit of the water vapor 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 optical film for an organic EL display device is within the aforementioned range, when the optical film for an organic EL display device is applied to an organic EL element, the entry of moisture into the organic EL element can be suppressed, so that the organic EL element can be prevented from being caused by moisture. Deterioration, etc., so it is suitable. The aforementioned method for measuring the moisture permeability can be measured by the method described in the examples.

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

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

In addition, 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 direction of the maximum refractive index in the plane (that is, the slow axis direction), ny is the refractive index in the direction orthogonal to the slow axis (that is, the fast axis direction) in the plane, and nz is the refractive index in the thickness direction. . In addition, in this specification, ny=nz includes not only the case of exact equality, but also the case of substantial equality.

The Nz coefficient of the retardation film 3a is preferably 0.9~2, preferably 1~1.5, and more preferably 1~1.3. Here, the Nz coefficient can be obtained by Nz=Rth/Re. The aforementioned Rth is the retardation 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 that can obtain the 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 the inverse dispersion wavelength characteristics that the retardation value increases with the wavelength of the measurement light, and it can also exhibit the positive wavelength dispersion characteristics that the retardation value decreases with the wavelength of the measurement light, and it can also exhibit the retardation value almost not changing. Measure the flat wavelength dispersion characteristics of the wavelength change of light, and should show flat wavelength dispersion characteristics. By using a λ/4 plate with flat wavelength dispersion characteristics, excellent anti-reflection characteristics and reflection hue in oblique directions can be achieved. Re(450)/Re(550) of retardation film 3a should be 0.85~1.03, and Re(650)/Re(550) should be 0.98~1.02. Here, Re(λ) is the in-plane phase difference measured with light of wavelength λnm at 23°C. For example, Re(450) represents the in-plane phase difference measured at 23°C with light of wavelength 450nm.

The above-mentioned retardation film 3a may be composed of an arbitrary and appropriate resin film that can satisfy the above-mentioned optical characteristics. Any and appropriate resins can be used for the resin forming the above resin film, and specific examples include cycloolefin resins such as polynorbornene, polycarbonate resins, cellulose resins, polyvinyl alcohol resins, and polyvinyl resins. And other resins. Among these, polynorbornene and polycarbonate resins are preferred.

The above-mentioned polynorbornene means a (co)polymer that can be prepared by partially or entirely using a norbornene-based monomer having a norbornene ring in part or all of the starting materials (monomers).

The above-mentioned polynorbornene has been sold in various products on the market. For specific examples, Japanese ZEON (stock) product names "ZEONEX" and "ZEONOR", JSR (stock) product names "Arton", TICONA company product names "TOPAS", and Mitsui Chemicals Produced the product name "APEL".

The aforementioned polycarbonate resin contains at least a structural unit derived from a dihydroxy compound having a bond structure represented by the following structural formula (1), and may have at least one bond structure in the molecule in the presence of a polymerization catalyst "-CH ₂ -O-" The dihydroxy compound of the dihydroxy compound is prepared by reacting with a carbonic acid diester.

[Chemical formula 1]

The dihydroxy compound having the bond structure shown in the above structural formula (1), as long as it has a structure with two alcoholic hydroxyl groups and a linking group "-CH ₂ -O-" in the molecule, and can interact with the polymer in the presence of a polymerization catalyst Carbonic acid diesters react to produce polycarbonate compounds. Compounds of any structure can be used, or multiple types can be used in combination. In addition, as for the dihydroxy compound used for the polycarbonate resin, a dihydroxy compound that does not have a bond structure represented by the structural formula (1) can also be used in combination. Hereinafter, the dihydroxy compound having the bond structure shown in structural formula (1) is sometimes referred to as dihydroxy compound (A), and the dihydroxy compound without the bond structure shown in structural formula (1) is sometimes referred to as dihydroxy compound ( B).

(Dihydroxy compound (A)) The linking group "-CH ₂ -O-" of the dihydroxy compound (A) means a structure in which atoms other than hydrogen atoms are bonded to each other to form a molecule. Among the linking groups, carbon atoms are most preferred as far as atoms to which an oxygen atom can be bonded or atoms to which a carbon atom and an oxygen atom can be bonded simultaneously. The number of the linking group "-CH ₂ -O-" in the dihydroxy compound (A) is 1 or more, and preferably 2~4.

More specifically, the dihydroxy compound (A) can be exemplified by 9,9-bis(4-(2-hydroxyethoxy)phenyl)pyridium, 9,9-bis(4-(2-hydroxyethoxy) -2-Methyl)phenyl)pyridium, 9,9-bis(4-(2-hydroxyethoxy)-3-methylphenyl)pyridium, 9,9-bis(4-(2-hydroxyethyl) Oxy)-3-isopropylphenyl)sulfuron, 9,9-bis(4-(2-hydroxyethoxy)-3-isobutylphenyl)sulfuron, 9,9-bis(4-( 2-Hydroxyethoxy)-3-tertiary butylphenyl) sulphur, 9,9-bis(4-(2-hydroxyethoxy)-3-cyclohexylphenyl) sulphur, 9,9-bis (4-(2-hydroxyethoxy)-3-phenylphenyl)pyridium, 9,9-bis(4-(2-hydroxyethoxy)-3,5-dimethylphenyl)pyridium, 9,9-bis(4-(2-hydroxyethoxy)-3-tert-butyl-6-methylphenyl)sulfuron, 9,9-bis(4-(3-hydroxy-2,2- Dimethylpropoxy) phenyl) a compound having an aromatic group in the side chain and an ether group bonded to the aromatic group in the main chain; bis[4-(2-hydroxyethoxy)phenyl]methane , 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)phenyl]propane, 1,1-bis [4-(2-hydroxyethoxy)phenyl]-3,3,5-trimethylcyclohexane, 1,1-bis[4-(2-hydroxyethoxy)phenyl]cyclohexane , 1,4-bis[4-(2-hydroxyethoxy)phenyl]cyclohexane, 1,3-bis[4-(2-hydroxyethoxy)phenyl]cyclohexane, 2,2 -Bis[4-(2-hydroxyethoxy)-3-phenylphenyl]propane, 2,2-bis[(2-hydroxyethoxy)-3-isopropylphenyl]propane, 2, 2-bis[3-tertiarybutyl-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[ Bis(hydroxyalkoxyaryl)alkanes such as 3-cyclohexyl-4-(2-hydroxyethoxy)phenyl]propane; 1,1-bis[4-(2-hydroxyethoxy)phenyl ]Cyclohexane, 1,1-bis[3-cyclohexyl-4-(2-hydroxyethoxy)phenyl]cyclohexane, 1,1-bis[4-(2-hydroxyethoxy)benzene Cyclopentane and other bis(hydroxyalkoxyaryl) cycloalkanes; 4,4'-bis(2-hydroxyethoxy)diphenyl ether, 4,4'-bis(2-hydroxyethoxy) Group) -3,3'-dimethyldiphenyl ether, 4,4'-dihydroxy-2, Dihydroxy alkoxy diaryl ethers such as 5-diethoxy diphenyl ether; 4,4'-bis(2-hydroxyethoxyphenyl) sulfide, 4,4'-bis[4- (2-Dihydroxyethoxy)-3-methylphenyl]sulfide and other bishydroxyalkoxy aryl sulfides; 4,4'-bis(2-hydroxyethoxyphenyl) sulfene, 4,4'-bis[4-(2-dihydroxyethoxy)-3-methylphenyl] sulfene and other bishydroxyalkoxy aryl sulfenes; 4,4'-bis(2-hydroxyl Ethoxyphenyl) chrysene, 4,4'-bis[4-(2-dihydroxyethoxy)-3-methylphenyl] chrysene and other bishydroxyalkoxy aryl clumps; 1,4- Bishydroxyethoxybenzene, 1,3-bishydroxyethoxybenzene, 1,2-bishydroxyethoxybenzene, 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, sugar alcohol anhydrides representing the dihydroxy compound represented by the following formula (2) and the following general Compounds having a cyclic ether structure such as spiroglycerin represented by the formula (3) can be used alone or in combination of two or more kinds.

[Chemical formula 2]

[Chemical formula 3]

The dihydroxy compound represented by the aforementioned formula (2) can be, for example, isosorbide, anhydrous mannitol, and isoiditol, which are related to stereoisomers. These can be used alone or in combination. Use the above in combination.

Furthermore, for example, oxyalkylene glycols and glycols having a cyclic ether structure are also very suitable for use as the dihydroxy compound (A).

烷二醇類。Examples of the aforementioned oxyalkylene glycols include diethylene glycol, triethylene glycol, tetraethylene glycol, and polyethylene glycol. The aforementioned glycols with a cyclic ether structure can be exemplified by spiroglycerols, two

Alkanediols.

Among these dihydroxy compounds (A), it can be obtained by dehydrating and condensing sorbitol, which can be produced from various starches that are rich in resources and easy to obtain, from the perspectives of availability, ease of manufacture, optical properties, and moldability. Isosorbide is suitable. In addition, 9,9-bis[4-(2-hydroxyethoxy)phenyl]sulfonate or polyethylene glycol is also preferable.

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

(Dihydroxy compound (B)) For the dihydroxy compound (B), for example, an alicyclic dihydroxy compound, an aliphatic dihydroxy compound, an aromatic dihydroxy compound, and the like can be mentioned.

The aforementioned 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-membered ring structure can be fixed into a chair or boat shape by covalent bonds. The alicyclic dihydroxy compound has a 5-membered ring or 6-membered ring structure, which can improve the heat resistance of the obtained polycarbonate, so it is suitable. The number of carbon atoms contained in the alicyclic dihydroxy compound is usually 70 or less, preferably 50 or less, and preferably 30 or less. The larger the value, the higher the heat resistance, but it will become 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 easier it is to start.

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

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

[Chemical formula 4]

As the alicyclic dihydroxy compound represented by the above general formula (I), tricyclodecane dimethanol and pentacyclopentadecane dimethanol include general formula (I) R ^{1 and} the following general formula (Ib) (wherein, n represents various isomers represented by 0 or 1).

[Chemical formula 5]

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

[Chemical formula 6]

In addition, norbornane dimethanol, which is an alicyclic dihydroxy compound represented by the above general formula (I), includes ^{various isomers in which R 1} in the general formula (I) is represented by the following general formula (Id). Specific examples of such isomers include 2,3-norbornane dimethanol, 2,5-norbornane dimethanol, and the like.

[Chemical formula 7]

Adamantane dimethanol, which is an 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 and the like.

[Chemical formula 8]

In addition, the cyclohexanediol of the alicyclic dihydroxy compound represented by the above general formula (II) includes R ² in the general formula (II) in the following general formula (IIa) (where R ³ represents a carbon number of 1-12 Alkyl group or hydrogen atom) represents various isomers. Specific examples of such isomers include 1,2-cyclohexanediol, 1,3-cyclohexanediol, 1,4-cyclohexanediol, 2-methyl-1,4-cyclohexanediol, etc. .

[Chemical formula 9]

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

[Chemical formula 10]

Decahydronaphthalenediol or tricyclotetradecanediol, which is an alicyclic dihydroxy compound represented by the above general formula (II), includes R ² in the general formula (II) to the following general formula (IIc) (wherein, m represents various isomers represented by 0 or 1). Specifically, 2,6-decahydronaphthalenediol, 1,5-decahydronaphthalenediol, 2,3-decahydronaphthalenediol, etc. can be used as such isomers.

[Chemical formula 11]

Norbornanediol, which is an alicyclic dihydroxy compound represented by the above general formula (II), includes ^{various isomers in which R 2} in the general formula (II) is represented by the following general formula (IId). Specifically, 2,3-norbornanediol, 2,5-norbornanediol, etc. can be used for such isomers.

[Chemical formula 12]

Adamantanediol, which is an alicyclic dihydroxy compound represented by the above general formula (II), includes ^{various isomers in which R 2} in the general formula (II) is represented by the following general formula (IIe). Specifically, 1,3-adamantanediol and the like can be used for such isomers.

[Chemical formula 13]

Among the specific examples of the aforementioned alicyclic dihydroxy compounds, cyclohexane dimethanol, tricyclodecane dimethanol, adamantane diols, and pentacyclopentadecane dimethanol are particularly preferred. From the viewpoint of good operation, 1,4-cyclohexanedimethanol, 1,3-cyclohexanedimethanol, 1,2-cyclohexanedimethanol, and tricyclodecanedimethanol are preferred.

The aforementioned aliphatic dihydroxy compound may be exemplified by ethylene glycol, 1,3-propanediol, 1,2-propanediol, 1,4-butanediol, 1,3-butanediol, 1,2-butanediol, 1 ,5-Heptanediol, 1,6-hexanediol, etc.

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-hydroxyphenyl) 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) sulfide, 2,4'-dihydroxydiphenyl sulfide, bis(4-hydroxyphenyl) sulfide, 4, 4'-dihydroxydiphenyl ether, 4,4'-dihydroxy-3,3'-dichlorodiphenyl ether, 9,9-bis(4-hydroxyphenyl) pyrene, 9,9-bis( 4-hydroxy-2-methylphenyl) 茀 and so on.

In addition, 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 to these. 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 along the application can be obtained.

The ratio of the dihydroxy compound (A) to the total dihydroxy compound constituting the polycarbonate resin is not particularly specific, but is preferably 10 mol% or more, preferably 40 mol% or more, and more preferably 60 mol% or more. In addition, the upper limit is preferably 100 mol% or less. If the content ratio of the structural unit derived from the dihydroxy compound (B) is too large, performance such as optical characteristics may be lowered.

In addition, when an alicyclic dihydroxy compound, aliphatic dihydroxy compound, or aromatic dihydroxy compound is used, the total dihydroxy compound (A) of the all dihydroxy compound constituting the polycarbonate and the total of these dihydroxy compounds The ratio is not particularly limited, and the ratio can be selected. In addition, the content ratio of the structural unit derived from the dihydroxy compound (A) to the structural unit derived from each of these dihydroxy compounds is also not particularly limited, and the ratio can be optionally selected.

(Carbon acid diester) Carbonic acid 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 xylenyl carbonate. Diethyl and di-tertiary butyl carbonate, among which diphenyl carbonate and substituted diphenyl carbonate are particularly preferred. These carbonic acid diesters may be used individually by 1 type, and 2 or more types may be mixed and used for it.

Compared with the all-dihydroxy compound used in the reaction, the carbonic acid diester is preferably used in 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, and the thermal stability of the polymer may deteriorate, and the desired high molecular weight body cannot be obtained. In addition, if the molar ratio is greater than 1.10, not only the speed of the transesterification reaction under the same conditions may be slowed down, and it becomes difficult to produce polycarbonate with the desired molecular weight, and the resulting polycarbonate copolymer will have residual carbonic acid diester. The amount may also increase, and the remaining carbonic acid diester is the source of odor during molding or molded products.

As a film application, flexibility is usually required, so the glass transition temperature (Tg) of the polycarbonate resin is preferably 45°C or higher, preferably 45~130°C.

The polycarbonate 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. As for the type of polymerization catalyst and the amount of addition thereof, a known known substance and amount of addition can be appropriately adopted, and a known known method can also be appropriately adopted for the solution polymerization method.

The retardation film 3a can be produced by, for example, stretching a film formed of the above-mentioned resin. The method of forming a thin film from the above-mentioned resin can adopt any suitable forming method. Specific examples include compression molding method, transfer 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), calender molding method , Hot pressing method, etc. Among these methods, the extrusion molding method or the casting coating method is suitable 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. In addition, the above-mentioned resins have been sold in a variety of film products on the market, and the commercially available films can also be directly used for stretching.

The stretching ratio of the above-mentioned 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 ratio is preferably about 1.75 times to 3.00 times, preferably about 1.80 times to 2.80 times, and more preferably about 1.85 times to 2.60 times.

The stretching temperature of the above-mentioned film can be appropriately set according to the required in-plane retardation value and thickness of 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, preferably about 130°C to 140°C.

Any and appropriate stretching method can be used for the stretching method of the above-mentioned film. Specifically, various extension methods such as free end extension, fixed end extension, free end contraction, and fixed end contraction can be used alone or simultaneously or sequentially. Regarding the extension direction, it can also be carried out in various directions and dimensions such as the horizontal direction, the vertical direction, the thickness direction, and the diagonal direction.

In one embodiment, the retardation film 3a can be formed by uniaxially stretching a resin film at the free end or uniaxially stretching the fixed end. A specific example of uniaxial stretching of the free end may be a method of moving the resin film along the longitudinal direction while stretching between rollers with different peripheral speeds. A specific example of uniaxial stretching of the fixed end may be a method in which the resin film is moved in the longitudinal direction and stretched in the width direction (lateral direction) at the same time.

In another embodiment, the retardation film 3a is produced by continuously extending a long resin film obliquely along a direction at a predetermined angle with respect to the longitudinal direction. By adopting oblique stretching, a long stretched film with a predetermined angle of alignment (the direction along the predetermined angle is the slow axis) relative to the longitudinal direction of the film can be obtained. For example, when laminated with a polarizer, a roll can be used The rollers can simplify the manufacturing steps. In addition, roll-to-roll refers to a method in which the film is transported by rolls, and the longitudinal direction is aligned and laminated.

The stretching machine used for oblique stretching can be exemplified by a tenter stretching machine, which can apply a pushing force, a stretching force or a traction force at different speeds in the lateral direction and/or longitudinal direction. Tenter stretching machines include horizontal uniaxial stretching machines, simultaneous biaxial stretching machines, etc. Any and appropriate stretching machines can be used as long as the long resin film can be continuously stretched diagonally.

The optical film for an organic EL display device of the present invention does not have a barrier layer containing an inorganic thin film, so the aforementioned retardation film 3a does not have a barrier layer containing an inorganic thin film. Such inorganic thin films can usually be formed by sputtering, etc., but heat is generated during the formation process. If such an inorganic film is provided on the aforementioned 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. The aforementioned inorganic thin film may, for example, contain at least one inorganic compound selected from the group consisting of oxides, nitrides, hydrides, and composite compounds thereof. An example of the inorganic compound forming the inorganic thin film can be diamond-like carbon (DLC), silicon nitride (SiNx), silicon oxide (SiOy), aluminum oxide (AlOz), aluminum nitride, and the like.

(1-2) Second retardation film The aforementioned second retardation film 3b preferably exhibits the relationship of nz>nx≧ny in refractive index characteristics. By having the second retardation film having such refractive index characteristics, the angular dependence of the effect of absorbing reflected light can be reduced, and the reflected light reflected at various angles can be prevented from exiting, so it is suitable.

The thickness direction retardation Rth(550) of the aforementioned second retardation film 3b is preferably -260nm~-10nm, preferably -230nm~-15nm, and more preferably -215nm~-20nm. Within the above range, the above effect can be clearly exhibited, so it is suitable.

In one embodiment, the above-mentioned second retardation film 3b shows a relationship in which the refractive index thereof 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 shows the relationship of the refractive index of 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 aforementioned second retardation film 3b can be formed of any and appropriate material, and is not particularly limited, but it is preferably fixed to a liquid crystal layer in a vertical orientation. The liquid crystal material (liquid crystal compound) that can adopt homeotropic alignment can be a liquid crystal monomer or a liquid crystal polymer. Specific examples of the liquid crystal compound and the method of forming the liquid crystal layer include the liquid crystal compound and the method of forming described in paragraphs [0020] to [0042] in Japanese Patent Application Laid-Open No. 2002-333642. At this time, the thickness is preferably 0.1 μm to 5 μm, preferably 0.2 μm to 3 μm.

Regarding other suitable specific examples, the second retardation film 3b may be a retardation film formed of a fumarate diester-based resin described in JP 2012-32784 A. At this time, the thickness is preferably 5 μm to 50 μm, preferably 10 μm to 35 μm.

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

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

In addition, the aforementioned first retardation film 3a and second retardation film 3b can pass through any adhesive layer or adhesive layer 4 laminated. Adhesive layer or adhesive layer 4 is suitable for using the materials described in this specification. For example, acrylic adhesives with (meth)acrylic polymer as the base polymer have good optical transparency and exhibit moderate wettability and cohesiveness. It is suitable because of its adhesive properties and excellent weather resistance and heat resistance. Moreover, any well-known adhesive layer or adhesive layer can also be used.

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

The moisture permeability of the aforementioned adhesive layer is below 50g/(m ² ･day), preferably below 30g/(m ² ･day), preferably below 20g/(m ² ･day), 15g/(m ² ･day) ) The following is better. In addition, the lower limit of the water vapor 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 (retardation film) containing the adhesive layer is applied to an organic EL device, the entry of moisture into the organic EL device can be suppressed, and the organic EL device can be suppressed It is suitable because of deterioration due to moisture. The aforementioned moisture permeability is the water vapor permeability (moisture permeability) of the adhesive layer with a thickness of 50 μm under the conditions of 40° C. and 92% RH. The measurement method can be measured by the method described in the examples.

(2-1) Adhesive layer The moisture permeability of the adhesive layer at 40°C and 92%RH should be 50g/(m ² ･day) or less. The composition is not particularly limited, and any and appropriate adhesive can be used. The layer formed by the agent. 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-based hot melt adhesives. , Epoxy resin adhesive, vinyl chloride resin solvent adhesive, chloroprene rubber adhesive, cyanoacrylate adhesive, silicone adhesive, styrene-butadiene rubber solvent adhesive Adhesives, nitrile rubber adhesives, nitrocellulose adhesives, reactive hot melt adhesives, phenol resin adhesives, modified silicone adhesives, polyester hot melt adhesives, polyamide resin heat Melting agent, polyimide-based adhesive, polyurethane resin hot-melt adhesive, polyolefin resin hot-melt adhesive, polyvinyl acetate resin solvent-based adhesive, polystyrene resin solvent-based adhesive, Polyvinyl alcohol adhesive, polyvinylpyrrolidone resin adhesive, polyvinyl butyral adhesive, polybenzimidazole adhesive, polymethacrylate resin solvent adhesive, melamine resin adhesive , Urea resin-based adhesives, resorcinol-based adhesives, etc. These adhesives can be used individually by 1 type or in mixture of 2 or more types.

If classified according to the bonding form, the adhesive can be, for example, a thermosetting adhesive, a hot melt adhesive, and the like. These adhesives may be one type or two or more types.

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

The hot-melt adhesive is melted or softened by heating to heat-melt on the adherend, and then solidified by cooling and then adhered to the adherend. Examples of hot melt adhesives include rubber hot melt adhesives, polyester hot melt adhesives, polyolefin hot melt adhesives, ethylene-vinyl acetate resin hot melt adhesives, and polyamide resin hot melt adhesives. , Polyurethane resin hot melt adhesive, etc. The softening temperature (ring and ball method) of the hot melt adhesive is, for example, 100~200°C. In addition, the melt viscosity of the hot melt adhesive is 180°C, for example, 100~30000mPa･s.

The thickness of the adhesive layer is not particularly limited. For example, it is preferably about 0.01 to 10 μm, preferably about 0.05 to 8 μm.

(2-2) Adhesive layer The moisture permeability of the adhesive layer at 40°C and 92%RH should be 50g/(m ² ･day) or less. The composition is not particularly limited, and any and appropriate adhesive can be used. The layer formed by the agent composition. The adhesive composition may include: rubber adhesives, acrylic adhesives, silicone adhesives, urethane adhesives, vinyl alkyl ether adhesives, polyvinyl alcohol adhesives, poly Vinylpyrrolidone-based adhesives, polyacrylamide-based adhesives, cellulose-based adhesives, etc., from the viewpoint of moisture permeability, rubber-based adhesive compositions are preferred among them.

The rubber-based adhesive composition may contain 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 region around room temperature. Specifically, styrene-based thermoplastic elastomers, isobutylene-based polymers, and the like can be cited, but in the present invention, it is preferable to use polyisobutylene (PIB) which is an isobutylene homopolymer from the viewpoint of weather resistance. This is because polyisobutylene does not contain double bonds in the main chain, so it has excellent light resistance.

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

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

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

In addition, the rubber-based adhesive composition used in the present invention may contain polymers or elastomers other than the aforementioned polyisobutylene. Specific examples include copolymers of isobutylene and n-butylene, copolymers of isobutylene and isoprene (such as standard butyl rubber, chlorinated butyl rubber, bromobutyl rubber, partially cross-linked butyl rubber, etc.) Base rubbers), these vulcanized products and modified products (such as those modified with functional groups such as hydroxyl, carboxyl, amine, epoxy) and other isobutylene polymers; styrene-ethylene-butene-styrene Block copolymer (SEBS), styrene-isoprene-styrene block copolymer (SIS), styrene-butadiene-styrene block copolymer (SBS), styrene-ethylene-propylene- Styrene block copolymer (hydrogenated product of SEPS and SIS), styrene-ethylene-propylene block copolymer (hydrogenated product of SEP, styrene-isoprene block copolymer), 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 rubber, polyurethane Thermoplastic elastomer; polyester-based thermoplastic elastomer; hybrid thermoplastic elastomer such as a polymer blend of polypropylene and EPT (ternary ethylene-propylene rubber), etc. 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 relative to 100 parts by weight of the aforementioned polyisobutylene, and it is better not to contain them from the viewpoint of durability.

In addition, the rubber-based adhesive composition used in the present invention particularly preferably contains the aforementioned polyisobutylene and a hydrogen abstraction type photopolymerization initiator.

The aforementioned hydrogen abstraction-type photopolymerization initiator means that the initiator itself can be irradiated with active energy rays, that is, hydrogen can be abstracted from the aforementioned polyisobutene to form a reaction point in the polyisobutene without cracking. By forming this reaction point, a cross-linking reaction of polyisobutylene can be initiated.

In addition to the hydrogen abstraction type photopolymerization initiator used in the present invention, the photopolymerization initiator is also known as a cleavage type photopolymerization initiator, which cracks and decomposes the photopolymerization initiator itself by irradiating active energy rays to generate free radicals. However, if a cleavage type photopolymerization initiator is used for the polyisobutylene used in the present invention, the main chain of the polyisobutylene will be cut by the photopolymerization initiator that generates free radicals, and crosslinking cannot be performed. In the present invention, by using a hydrogen abstraction type photopolymerization initiator, polyisobutylene can be crosslinked as described above.

、2,4-二甲基9-氧硫𠮿

、2,4-二乙基9-氧硫𠮿

、2,4-二氯9-氧硫𠮿

等9-氧硫𠮿

系化合物；4,4’-雙(二甲基胺基)二苯基酮、4,4’-二乙基胺基二苯基酮等胺基二苯基酮系化合物；10-丁基-2-氯吖啶酮、2-乙基蒽醌、9,10-菲醌、樟腦醌等；萘乙酮、1-羥環己基苯基酮等芳香族酮化合物；對苯二甲醛等芳香族醛類、甲基蒽醌等醌系芳香族化合物。該等可單獨使用1種或可將2種以上混合使用。從反應性觀點來看，該等中又以二苯基酮系化合物為宜，二苯基酮較佳。Hydrogen abstraction type photopolymerization initiators include acetophenone, diphenyl ketone, phthalic acid methyl-4-phenyl diphenyl ketone, 4,4'-dichloro diphenyl ketone, hydroxyl Diphenyl ketone, 4,4'-dimethoxybenzophenone, 4,4'-dichlorodiphenyl ketone, 4,4'-dimethyldiphenyl ketone, 4-benzyl ketone -4'-Methyl-diphenyl sulfide, acrylated diphenyl ketone, 3,3',4,4'-tetra(tertiary butylperoxycarbonyl) diphenyl ketone, 3,3' -Dimethyl-4-methoxydiphenyl ketone and other diphenyl ketone compounds; 2-isopropyl 9-oxysulfur 𠮿

, 2,4-Dimethyl 9-oxysulfur 𠮿

, 2,4-Diethyl 9-oxysulfur 𠮿

, 2,4-Dichloro 9-oxysulfur 𠮿

Wait 9-oxysulfur 𠮿

Series compounds; 4,4'-bis(dimethylamino) benzophenone, 4,4'-diethylamino benzophenone and other amino benzophenone compounds; 10-butyl- 2-chloroacridone, 2-ethylanthraquinone, 9,10-phenanthrenequinone, camphorquinone, etc.; naphthophenone, 1-hydroxycyclohexyl phenyl ketone and other aromatic ketone compounds; terephthalaldehyde and other aromatic compounds Quinone-based 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, among these, benzophenone-based compounds are preferred, and benzophenone is preferred.

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

Furthermore, in the present invention, a cleavage-type photopolymerization initiator can be used together with the aforementioned hydrogen-abstraction-type photopolymerization initiator within a range that does not impair the effects of the present invention. However, for the aforementioned reasons, it is not preferable to use it.

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

烷二醇二(甲基)丙烯酸酯、三羥甲丙烷三(甲基)丙烯酸酯、新戊四醇三(甲基)丙烯酸酯、新戊四醇四(甲基)丙烯酸酯、二新戊四醇五(甲基)丙烯酸酯、二新戊四醇六(甲基)丙烯酸酯、EO改質二丙三醇四(甲基)丙烯酸酯等(甲基)丙烯酸與多元醇之酯化物、9,9-雙[4-(2-(甲基)丙烯醯氧基乙氧基)苯基]茀等。該等可單獨使用1種或可作成2種以上之混合物來使用。該等中，若從相對於聚異丁烯之相溶性觀點來看，以(甲基)丙烯酸與多元醇之酯化物為宜，具有2個(甲基)丙烯醯基之2官能(甲基)丙烯酸酯、具有3個以上(甲基)丙烯醯基之3官能(甲基)丙烯酸酯較佳，三環癸烷二甲醇二(甲基)丙烯酸酯、三羥甲丙烷三(甲基)丙烯酸酯尤佳。The aforementioned polyfunctional radical polymerizable compound is a compound having at least two radical polymerizable functional groups having an unsaturated double bond such as a (meth)acryloyl 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 diepoxide Propyl ether di(meth)acrylate, neopentyl glycol di(meth)acrylate, tricyclodecane dimethanol di(meth)acrylate, di

Alkyl glycol di(meth)acrylate, trimethylolpropane tri(meth)acrylate, neopentyl erythritol tri(meth)acrylate, neopentyl erythritol tetra(meth)acrylate, dineopentyl Esterification products of (meth)acrylic acid and polyhydric alcohols such as tetraol penta(meth)acrylate, dineopentaerythritol hexa(meth)acrylate, EO modified diglycerol tetra(meth)acrylate, etc. 9,9-Bis[4-(2-(meth)propenyloxyethoxy)phenyl]茀 and so on. These can be used individually by 1 type or as a mixture of 2 or more types. Among them, from the viewpoint of compatibility with polyisobutylene, the esterified product of (meth)acrylic acid and polyol is preferable, and a bifunctional (meth)acrylic acid having two (meth)acrylic groups Esters, trifunctional (meth)acrylates with 3 or more (meth)acrylic groups are preferred, tricyclodecane dimethanol di(meth)acrylate, trimethylolpropane tri(meth)acrylate Especially good.

The content of the polyfunctional radical polymerizable compound is preferably 20 parts by weight or less, preferably 15 parts by weight or less, and more preferably 10 parts by weight or less relative to 100 parts by weight of the polyisobutylene. In addition, the lower limit of the content of the polyfunctional radical polymerizable compound is not particularly limited. However, for example, relative to 100 parts by weight of the aforementioned polyisobutylene, it is preferably 0.1 part by weight or more, preferably 0.5 part by weight or more, and more preferably 1 part by weight or more. . From the viewpoint of durability of the resulting rubber-based adhesive layer, it is preferable that the content of the polyfunctional radical polymerizable compound is within the aforementioned range.

The molecular weight of the polyfunctional radical polymerizable compound is not particularly limited, but for example, it is preferably about 1,000 or less, and 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 tackifier containing a terpene skeleton, a tackifier containing a rosin skeleton, and these hydrides. . If the rubber-based adhesive composition contains a tackifier, it has a high degree of adhesion to various adherends, and it can form a highly durable rubber-based adhesive layer even in a high temperature environment, so it is suitable .

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

The aforementioned binder containing rosin skeleton can include rosin resin, polymerized rosin resin, hydrogenated rosin resin, rosin ester resin, hydrogenated rosin ester resin, rosin phenol resin, etc. Specifically, rosin gum, wood rosin, tall oil rosin can be used Unmodified rosin (raw rosin) or modified rosin that has been hydrogenated, heterogenized, polymerized, or otherwise chemically modified, and its derivatives.

As the aforementioned tackifier, for example, commercially available products such as CLEARON series, POLYSTER series manufactured by Yasuhara Chemical Co., Ltd., SUPER ESTER series manufactured by Arakawa Chemical Industry Co., Ltd., PENSEL series, and PINECRYSTAL series can be used.

When the aforementioned tackifier is a hydrogenated product, the hydrogenation may be a partially hydrogenated product formed by partial hydrogenation, or a completely hydrogenated product formed by hydrogenating all double bonds in the compound. In the present invention, from the viewpoints of adhesive properties, weather resistance, and hue, a completely hydrogenated product is preferable.

From the standpoint of adhesive properties, the aforementioned tackifier preferably contains a cyclohexanol skeleton. The detailed principle is not clear, but we speculate that the compatibility of the cyclohexanol skeleton and the polyisobutylene of the base polymer can be more balanced than the phenol skeleton. The tackifier containing a cyclohexanol skeleton is, for example, a hydrogenated product of terpene phenol resin, rosin phenol resin, etc., and a fully 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. For example, it is preferably about 80°C or higher, and preferably about 100°C or higher. If the softening point of the tackifier is above 80°C, even at high temperatures, the tackifier will not soften but can maintain the adhesive properties, so it is suitable. The upper limit of the softening point of the tackifier is not particularly limited, but if the softening point is too high, it may cause problems such as higher molecular weight, deterioration of compatibility, and whitening. It is preferably about below °C. In addition, the softening point of the tackifying resin mentioned here is defined as the value measured according to the 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 it is preferably 50,000 or less, and 30,000 or less, 10,000 or less, 10,000 or less, more preferably 8,000 or less, and 5,000 or less. In addition, although the lower limit of the weight average molecular weight of the aforementioned tackifier is not particularly limited, it is preferably 500 or more, preferably 1,000 or more, and more preferably 2,000 or more. If the weight average molecular weight of the aforementioned tackifier is within the aforementioned range, the compatibility with polyisobutylene is good, and it will not cause undesirable conditions such as whitening, so it is suitable.

With respect to 100 parts by weight of the aforementioned polyisobutylene, the addition 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. In addition, the lower limit of the amount of tackifier added 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. Keeping the usage amount of the tackifier within the aforementioned range can improve the adhesive properties, so it is suitable. In addition, if the amount of the tackifier used exceeds the aforementioned range, the cohesive force of the tackifier tends to decrease, which is not suitable.

In addition, the rubber-based adhesive composition that can be used in the present invention contains a tackifier other than the terpene skeleton-containing tackifier and the rosin skeleton-containing tackifier. Examples of the tackifier include petroleum resin-based tackifiers. The aforementioned petroleum-based tackifiers include aromatic petroleum resins, aliphatic petroleum resins, alicyclic petroleum resins (aliphatic cyclic petroleum resins), aliphatic and aromatic petroleum resins, and aliphatic and alicyclic petroleum resins. Family petroleum resin, hydrogenated petroleum resin, benzofuran resin, benzofuran-indene resin, etc.

The aforementioned 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 relative to 100 parts by weight of the aforementioned polyisobutylene.

It is also possible to add an organic solvent as a diluent to the aforementioned rubber-based adhesive composition. The diluent is not particularly limited, and examples thereof include toluene, xylene, n-heptane, dimethyl ether, etc., and these may be used alone or in combination of two or more. Among these, toluene is suitable.

The addition amount of the diluent is not particularly limited. For example, it is suitable to add about 50 to 95% by weight to the rubber-based adhesive composition, preferably about 70 to 90% by weight. From the viewpoint of coatability to the support etc., it is quite suitable to make the addition amount of the diluent within the aforementioned range.

It is also possible to add additives other than the foregoing to the rubber-based adhesive composition used in the present invention within a range that does not impair the effects of the present invention. Specific examples of additives include softeners, crosslinking agents (for example, polyisocyanates, epoxy compounds, alkyl etherified melamine compounds, etc.), fillers, anti-aging agents, ultraviolet absorbers, and the like. The type, combination, and amount of additives that can be added to the rubber-based adhesive composition can be appropriately set according to the purpose. The content (total amount) of the aforementioned additives in the rubber adhesive composition is preferably 30% by weight or less, 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 its manufacturing method is not particularly limited. For example, the adhesive composition can be coated on various supports, etc., and then heated and dried or irradiated with active energy rays. Form an adhesive layer.

When the rubber adhesive composition contains polyisobutylene, it is preferable to irradiate the adhesive composition with active energy rays to crosslink the polyisobutylene. The active energy ray is usually irradiated by applying the aforementioned rubber-based adhesive composition to various supports and the like, and then irradiating the obtained coating layer. In addition, the above-mentioned active energy ray irradiation may directly irradiate the coating layer (other members are not bonded), or may be irradiated after bonding the coating layer to various members such as optical films such as separators or glass. When irradiating after bonding to the aforementioned optical film or various members, 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 irradiated from the peeled surface.

Various methods can be adopted for the coating method of the aforementioned adhesive composition. Specifically, examples include roll coating, kiss-roll coating, gravure coating, reverse coating, roll brushing, spray coating, dip roll coating, bar coating, and knife coating. Cloth method, pneumatic knife coating method, curtain coating method, lip coating method, extrusion coating method using die coater, etc.

When heating and drying the coating layer of the aforementioned adhesive composition, the heating and drying temperature is preferably about 30°C to 200°C, preferably 40°C to 180°C, more preferably 80°C to 150°C. By setting the heating temperature within the above range, an adhesive layer with excellent adhesive properties can be obtained. The drying time can be suitably used for a suitable time. The above-mentioned 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 of irradiating active energy rays to the coating layer of the adhesive composition, when the adhesive or adhesive composition contains an organic solvent as a diluent, it is still suitable after coating or before the active energy ray irradiation 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 excess solvent, it is preferably about 30°C to 90°C, preferably about 60°C to 80°C. The drying time can be suitably used for a suitable time. The above-mentioned 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 rays, ultraviolet rays, and electron rays, among which ultraviolet rays are suitable.

The UV irradiation conditions are not particularly limited, and the composition of the rubber-based adhesive to be cross-linked can be set to arbitrary and appropriate conditions. For example, the cumulative amount of irradiation light is preferably 100mJ/cm ² ~2000mJ/cm ² .

As the aforementioned support, for example, a peel-off treated sheet (separator) or the aforementioned retardation film can be used.

The constituent materials of the aforementioned separator include plastic films such as polyethylene, polypropylene, polyethylene terephthalate, polyester film, porous materials such as paper, cloth, and non-woven fabrics, nets, foamed sheets, Suitable sheets, such as metal foils and laminates, etc., are suitable to use plastic films from the viewpoint of excellent surface smoothness.

The aforementioned plastic film can include, for example, polyethylene film, polypropylene film, polybutene film, polybutadiene film, polymethylpentene film, polyvinyl chloride film, vinyl chloride copolymer film, polyethylene terephthalate Ester film, polybutylene terephthalate film, polyurethane film, ethylene-vinyl acetate copolymer film, etc.

The thickness of the aforementioned separator is usually 5 to 200 μm, and ideally about 5 to 100 μm. The aforementioned separating parts can also be demoulded and antifouling treated with silicone, fluorine, long-chain alkyl or fatty acid amide based mold release agents and silica powder, or coated Antistatic treatment such as type, kneading type, vapor deposition type, etc. In particular, by appropriately performing peeling treatments such as silicone treatment, long-chain alkyl treatment, and fluorine treatment on the surface of the separator, the peelability from the adhesive layer can be further improved.

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

The thickness of the aforementioned adhesive layer is not particularly limited, and can be appropriately set according to its application, and is preferably 250 μm or less, preferably 100 μm or less, and more preferably 55 μm or less. In addition, the lower limit 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%, preferably about 25 to 98%, and more preferably about 45 to 90%. If the gel fraction is in the aforementioned range, durability and adhesion can be balanced, so it is suitable. In addition, the method for measuring the gel fraction can be measured by the method described in the examples.

(3) The other layer functions as a retardation film of a λ/4 plate and an ^{adhesive layer with a moisture permeability below 50g/(m 2} ･day) at 40°C and 92%RH constitutes the organic EL display of the present invention Optical films for devices, these can be laminated together, or have other layers in between.

The aforementioned other layer may be an adhesive layer or an adhesive layer other than the aforementioned adhesive layer (ie, an adhesive layer or an adhesive layer with a moisture permeability of more than 50g/(m ² ･day) at 40° C. and 92% RH Intermediate layers such as layer) and 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 aforementioned adhesive layer is not particularly limited as long as it is optically transparent. As the adhesive, various types of adhesives such as water-based, solvent-based, hot-melt-based, and active energy ray hardening type can be used, and water-based adhesives or active energy ray hardening type Adhesive is suitable.

In addition, when laminating the aforementioned retardation film and the adhesive layer, an easy-to-adhesion layer can be provided in between. The easy bonding layer can be formed by having, for example, a polyester skeleton, a polyether skeleton, a polycarbonate skeleton, a polyurethane skeleton, a polysiloxane, a polyamide skeleton, a polyimide skeleton, a polyvinyl alcohol skeleton, etc. Various resins to form. These polymer resins may be used individually by 1 type or in combination of 2 or more types. In addition, other additives may be added when the easy-to-adhesive layer is formed. Specifically, stabilizers such as tackifiers, ultraviolet absorbers, antioxidants, and heat-resistant stabilizers 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-reflection film of an organic EL display device (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 containing 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, it may include the aforementioned polarizer, retardation film 3a, and adhesive layer in this order. 2. The composition, or the composition including the aforementioned polarizer, adhesive layer 2 and retardation film 3a in this order.

In addition, the aforementioned polarizer 5a can be used as a single-sided protective polarizing film with a protective film on only one side of the polarizer 5a or a double-sided protective polarizing film with a protective film on both sides of the polarizer 5a.

The aforementioned structure 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 with polarizer 5a, it can be made of protective film 5b/polarizer 5a/adhesive layer or adhesive layer 4/retardation film 3a/adhesive as shown in Figure 3(a) Adhesive layer 2 constitutes a polarizing film. In addition, when used as a double-sided protective polarizing film 5B containing a polarizer 5a, it can be made into a protective film 5b/polarizer 5a/protective film 5b/adhesive layer or adhesive layer 4/ as shown in FIG. 3(b) Polarizing film composed of retardation film 3a/adhesive layer 2.

In the foregoing configuration (only 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°~55°, preferably 38°~52°, 40° ~50° is better, 42°~48° is better, 44°~46° is especially good. If the angle is within this range, the required circular polarization function can be achieved, so it is suitable. In addition, when referring to an angle in this specification, unless otherwise noted, the angle includes both clockwise and counterclockwise angles.

In the aforementioned configuration, the retardation film series exemplified the case where only the first retardation film 3a was used, but as described above, the second retardation film 3b may also be used. At that time, the above-mentioned components will be 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 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 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°~85°, preferably 72°~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°-20°, preferably 13°-17°, and more preferably 14°-16°. Arranging the two-phase retardation film at the above-mentioned axis angle can obtain a circular polarizing plate having very excellent circular polarization characteristics (and as a result, very excellent anti-reflection characteristics) in a wide frequency range, so it is suitable.

Hereinafter, each component used in the polarizing film for the organic EL display device of the present invention will be described.

(Optical film for organic EL display device) The optical film for organic EL display device may be as described above.

(Polarizer) The polarizer is not particularly limited, and various materials can be used. Polarizers can be exemplified by hydrophilic polymer films such as polyvinyl alcohol-based films, partially formalized polyvinyl alcohol-based films, ethylene-vinyl acetate copolymer-based partially saponified films, etc., which absorb iodine or dichroic dyes. Substances that are uniaxially stretched, and polyene-based alignment films such as dehydrated polyvinyl alcohol or dehydrochloric acid treated polyvinyl chloride. Among these, a polarizer made of a dichroic substance such as a polyvinyl alcohol-based film and iodine is suitable. The thickness of the polarizers is not particularly limited, and is generally about 5 to 80 μm.

The polarizing member in which a polyvinyl alcohol-based film is dyed with iodine and uniaxially stretched can be produced, for example, by immersing polyvinyl alcohol in an iodine aqueous solution to be dyed and stretched to 3 to 7 times the original length. It can be immersed in an aqueous solution such as potassium iodide, which may contain boric acid, zinc sulfate, zinc chloride, etc. according to needs. It is also possible to immerse the polyvinyl alcohol-based film in water for washing before dyeing. By washing the polyvinyl alcohol-based film with water, dirt and anti-blocking agents on the surface of the polyvinyl alcohol-based film can be washed away. In addition, it also has the effect of swelling the polyvinyl alcohol-based film to prevent unevenness such as staining. The extension may be performed after dyeing with iodine, the extension may be performed while dyeing, or it may be dyed with iodine after extension. Stretching can also be carried out in aqueous solutions such as boric acid or potassium iodide or in a water bath.

Also, from the viewpoint of thinning, a thin polarizer with a thickness of 15 μm or less is preferably used, and a thin polarizer with a thickness of 10 μm or less is more preferable. From the viewpoint of thinning, the thickness is preferably 1 to 7 μm. This kind of thin polarizer has less uneven thickness, good visibility and little dimensional change, so it has good durability. Moreover, the thickness of the polarizing film can be expected to be thinner. This is quite suitable.

Representative examples of thin polarizers include Japanese Patent Application Publication No. 51-069644, Japanese Patent Application Publication No. 2000-338329, International Publication No. 2010/100917, or Japanese Patent Application Publication No. 2014-59328 and Japanese Patent Application Publication 2012- The thin polarizing film described in the 73563 Bulletin. These thin polarizing films can be produced by a manufacturing method including a step of stretching a polyvinyl alcohol-based resin (hereinafter also referred to as a PVA-based 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 thin, it can be extended with the support of the resin base material for stretching, and it will not be broken due to stretching.

In the manufacturing method including the stretching step and the dyeing step in the state of the laminate, the high-magnification stretching and the improvement of the polarization performance are still possible in the manufacturing method. 2014-059328 and Japanese Patent Laid-Open No. 2012-073563 are described in that it is preferably obtained by a manufacturing method that includes a step of extending in an aqueous boric acid solution; in particular, such as Japanese Patent Laid-Open No. 2014-059328 and Japanese Patent Laid-Open It is described in the 2012-073563 Bulletin that it is preferable to use a manufacturing method that includes a step of auxiliary air extension before extension in an aqueous solution of boric acid.

(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, and isotropy. Examples include polyester-based polymers such as polyethylene terephthalate and polyethylene naphthalate, cellulosic polymers such as diacetyl cellulose and triacetyl cellulose, polymethylmethacrylate Acrylic polymers such as esters, styrene polymers such as polystyrene and acrylonitrile/styrene copolymer (AS resin), polycarbonate polymers, etc. In addition, examples of polymers forming the aforementioned protective film include polyethylene, polypropylene, cyclic or norbornene-based polyolefins, polyolefin-based polymers of ethylene-propylene copolymers, and vinyl chloride-based polymers. , Nylon or aromatic polyamides and other amide-based polymers, imine-based polymers, tungsten-based polymers, polyether ether-based polymers, polyetheretherketone-based polymers, polyphenylene sulfide-based polymers, Vinyl alcohol polymer, vinylidene chloride polymer, vinyl butyral polymer, arylate polymer, polyoxymethylene polymer, epoxy polymer, or a mixture of the foregoing polymers, etc. . The protective film can also be formed as a cured layer of thermosetting and ultraviolet curing resins such as acrylic, urethane, acrylic urethane, epoxy, and silicone. When a protective film is 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 also be used.

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

The aforementioned polarizer and the protective film are usually adhered to each other through a water-based adhesive or the like. Examples of water-based adhesives include isocyanate-based adhesives, polyvinyl alcohol-based adhesives, gelatin-based adhesives, vinyl-based latex systems, water-based polyurethanes, water-based polyesters, and the like. In addition to the above, the adhesive between the polarizer and the protective film may also include an ultraviolet curable adhesive, an electron beam curable adhesive, and the like. The adhesive for electron beam curable polarizing films can exhibit good adhesiveness to the various protective films mentioned above. In addition, 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, hard coating or anti-reflection treatment or treatment for the purpose of anti-adhesion, diffusion and anti-glare can be applied.

(Adhesive layer or adhesive layer) The adhesive layer or adhesive layer 4 used to bond the polarizing film 5 and the retardation film 3a or the retardation film 3a and the retardation film 3b is not particularly limited, and this specification can be used appropriately Those recorded in. Specifically, as for the adhesion of the retardation film 3a and the retardation film 3b, for example, an acrylic adhesive with a (meth)acrylic polymer as the base polymer has good optical transparency and exhibits moderate wettability and cohesiveness. It is suitable because of its adhesive properties and excellent weather resistance and heat resistance. The adhesion between the polarizing film 5 and the retardation film 3a can be, for example, the aforementioned water-based adhesive used to bond the polarizer and the 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 contain an adhesive layer, an adhesive layer, a primer layer, or other intermediary layers or easy-to-bond layers other than the above. The interposer layer or easy-adhesive layer can be exemplified by the foregoing.

In addition, a functional layer can be provided on the polarizing film for the organic EL display device of the present invention. By providing a functional layer, the generation of defects such as penetrating cracks and nano-slits that may occur in the polarizer can be suppressed, so it is suitable. The functional layer can be formed of various forming materials. The functional layer can be formed, for example, by coating a resin material on a polarizing member.

Examples of resin materials forming the aforementioned functional layer include polyester resins, polyether resins, polycarbonate resins, polyurethane resins, silicone resins, polyamide resins, and polyimide resins. Series resins, PVA-based resins, acrylic resins, etc. These resin materials can be used singly or in combination of two or more, among which one is selected from the group consisting of polyurethane-based resins and polyvinyl alcohol (PVA)-based resins. More than one species are preferable, and PVA-based resins are preferable. In addition, the form of the aforementioned resin may be water-based or solvent-based. The form of the aforementioned resin is preferably water-based resin, and preferably PVA-based resin. In addition, as the water-based resin, an acrylic resin aqueous solution or a urethane resin aqueous solution can be used.

If the aforementioned functional layer is too thick, the optical reliability and water resistance will be reduced. Therefore, the thickness of the functional layer is preferably 15 μm or less, preferably 10 μm or less, more preferably 8 μm or less, more preferably 6 μm or less, more preferably 5 μm or less, and particularly preferably 3 μm or less. On the other hand, the thickness of the functional layer is preferably 0.2 μm or more, preferably 0.5 μm or more, and more preferably 0.7 μm or more. The functional layer of this thickness can suppress the occurrence of cracks, so it is suitable.

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

The polarizing film for an organic EL display device of the present invention uses the aforementioned optical film for an organic EL display device, so it has excellent low moisture permeability. Since the polarizing film for an organic EL display device of the present invention is bonded to the organic EL element through the adhesive layer 2, the 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 by having 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 one having 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 organic EL display devices include the aforementioned ones.

The said adhesive layer 7 is not specifically limited, A well-known thing can be used. Moreover, the aforementioned adhesive layer with low moisture permeability can also be used for the aforementioned adhesive layer. The adhesive layer can be selected and used appropriately, such as (meth)acrylic polymer, silicone polymer, polyester, polyurethane, polyamide, polyether, fluorine-based or rubber-based Such polymers as the base polymer. Among them, acrylic adhesives that use (meth)acrylic polymers as the base polymer have good optical transparency, exhibit moderate wettability, cohesiveness and adhesion characteristics, and have weather resistance and heat resistance. It is suitable because it is excellent.

The aforementioned (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 with 4 to 24 carbon atoms at the end of the ester group. In addition, alkyl (meth)acrylate means alkyl acrylate and/or alkyl methacrylate, and the meaning of (meth) in the present invention is the same.

(Meth) acrylic acid alkyl esters may be linear or branched alkyl groups having 4 to 24 carbon atoms. From the viewpoint of easy balance of adhesive properties, linear or branched alkyl esters The alkyl (meth)acrylate of an alkyl group having 4 to 9 carbon atoms is suitable. These alkyl (meth)acrylates may be used individually by 1 type or in combination of 2 or more types.

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

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

For the production of this (meth)acrylic polymer, various known production methods such as radiation polymerization such as solution polymerization and ultraviolet polymerization, bulk polymerization, and emulsion polymerization, etc. can be appropriately selected. In addition, the obtained (meth)acrylic polymer may be any of random copolymers, block copolymers, graft copolymers, and the like.

The polymerization initiator, chain transfer agent, emulsifier, etc. that can be used for radical polymerization are not particularly limited, and known materials generally used in this field can be appropriately selected and used. In addition, the weight average molecular weight of the (meth)acrylic polymer can be controlled by the usage amount of the polymerization initiator and the chain transfer agent, and the reaction conditions, and the usage amount 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. The weight average molecular weight is greater than 400,000, which can meet the durability of the adhesive layer, or can prevent the cohesive force of the adhesive layer from shrinking and resulting in residual glue. On the other hand, once the weight average molecular weight exceeds 4 million, the adhesion tends to decrease. In addition, the viscosity of the adhesive in the solution system may become too high and difficult to apply. In addition, the weight average molecular weight means 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 the molecular weight.

唑啉系交聯劑、吖環丙烷系交聯劑、矽烷系交聯劑、烷基醚化三聚氰胺系交聯劑、金屬螯合物系交聯劑、過氧化物等交聯劑，該等可單獨使用1種或可將2種以上組合使用。前述交聯劑適宜使用異氰酸酯系交聯劑、環氧系交聯劑。The adhesive composition used in the present invention may contain a crosslinking agent. The cross-linking agent can include isocyanate-based cross-linking agents, epoxy-based cross-linking agents, polysiloxane-based cross-linking agents,

Oxazoline-based cross-linking agents, acridine-based cross-linking agents, silane-based cross-linking agents, alkyl etherified melamine-based cross-linking agents, metal chelate-based cross-linking agents, peroxides and other cross-linking agents, etc. One type may be used alone or two or more types may be used in combination. As the aforementioned crosslinking agent, an isocyanate-based crosslinking agent and an epoxy-based crosslinking agent are suitably used.

The above-mentioned crosslinking agent can be used alone or in combination of two or more, but the total content is preferably in the range of 0.01-10 parts by weight relative to 100 parts by weight of the aforementioned (meth)acrylic polymer The aforementioned crosslinking agent.

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

Furthermore, the adhesive composition used in the present invention may contain other well-known additives. For example, polyether compounds of polyalkylene glycols such as polypropylene glycol, powders such as colorants and pigments, dyes, etc. may be appropriately added according to the intended use. Surfactants, plasticizers, tackifiers, surface lubricants, leveling agents, softeners, antioxidants, anti-aging agents, light stabilizers, ultraviolet absorbers, polymerization inhibitors, inorganic or organic fillers, metal powders, Granules, foils, etc. In addition, a redox system with a reducing agent can also 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 the organic EL display device of the present invention or the polarizing plate with an adhesive layer, which can be bonded to the organic EL device through the adhesive layer 2. Other configurations of the organic EL display device of the present invention can be the same as those of the conventional organic EL display device.

The organic EL display device of the present invention contains the aforementioned polarizing plate for the organic EL display device or the aforementioned polarizing plate with an adhesive layer, so it has high optical reliability. Example

Hereinafter, the present invention will be specifically described with examples, but the present invention is not limited by these examples. As for the parts and symbol% in each example, they are all based on weight.

Production Example 1 (Preparation of the first retardation film) 37.5 parts by mass of isosorbide (ISB), 91.5 parts by mass of 9,9-bis[4-(2-hydroxyethoxy)phenyl] fluoride (BHEPF), and 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 the reaction vessel, respectively, in a nitrogen environment Set the heat medium temperature of the reaction vessel to 150°C and stir as needed to melt the raw materials as the first step of the reaction (approximately 15 minutes).

Then, the pressure in the reaction vessel was changed from normal pressure to 13.3 kPa, and the temperature of the heat medium in the reaction vessel was raised to 190° C. in 1 hour, and the generated phenol was discharged out of the reaction vessel. After keeping the temperature in the reaction vessel at 190°C for 15 minutes, change the pressure in the reaction vessel to 6.67kPa, increase the temperature of the heat medium in the reaction vessel to 230°C in 15 minutes, and let the generated phenol discharge to the reaction vessel In addition, as the second stage step. The stirring torque of the stirrer will increase, so in order to increase the temperature to 250°C in 8 minutes to further eliminate the generated phenol, the pressure in the reaction vessel is reduced to 0.200kPa or less. After reaching the predetermined stirring torque, the reaction is terminated, the resulting reactant is squeezed into water, and then granulated to obtain a BHEPF/ISB/PEG=42.9 mol%/52.8 mol%/4.3 mol% The ratio contains polycarbonate resin A derived from a structural unit of a dihydroxy compound. The obtained polycarbonate resin A had a glass transition temperature of 126°C and a reduced viscosity of 0.372 dL/g. After vacuum-drying the obtained polycarbonate resin A at 80°C for 5 hours, it was equipped with a uniaxial extruder (screw diameter: 25mm, roller set temperature: 220°C, manufactured by Isuzu Chemical Industries Co., 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 120μm. The water absorption rate of the obtained polycarbonate resin film was 1.2%.

After cutting the obtained polycarbonate resin film to a length of 300 mm and a width of 300 mm, it was longitudinally stretched at a temperature of 136° C. at a temperature of 136° C. at a double magnification using Lab-Stretcher KARO IV (manufactured by Bruckner) to obtain a retardation film. The Re (550) of the obtained retardation film is 141 nm, and the Rth (550) is 141 nm (nx: 1.5969, ny: 1.5942, nz: 1.5942), and exhibits 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 variation caused by the environmental test was 5 nm).

Production Example 2 (Preparation of the second retardation layer (second retardation film)) The following chemical formula (I) (the numbers 65 and 35 in the formula represent the molar% of the monomer unit, which is convenient for displaying as a block polymer) Weight-average molecular weight: 5000) 20 parts by weight of side chain liquid crystal polymer, 80 parts by weight of polymerizable liquid crystal in nematic liquid crystal phase (trade name: Paliocolor LC242, manufactured by BASF), and 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, the coating solution was applied to the base film (norcamphene-based resin film, trade name: ZEONEX, manufactured by ZEON Co., Ltd.) with a bar coater, and then heated and dried at 80°C for 4 minutes to make The liquid crystal is used for alignment. 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) of the second retardation layer on the substrate. The Re (550) of this layer is 0 nm, and the 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 (Preparation of Retardation Film A) After the first retardation film obtained in Production Example 1 was laminated through an acrylic adhesive and the second retardation layer (cured liquid crystal layer) obtained in Production Example 2 was removed, the base film was removed. A laminate (retardation film A) in which a liquid crystal cured layer was transferred onto the first retardation film. The obtained retardation film A is composed of the first retardation film/acrylic adhesive layer/second retardation layer. The Re (550) of the obtained retardation film A was 141 nm, and the Rth (550) was 70 nm.

Production Example 4 (Preparation of Retardation Film B) A long norbornene-based resin film (trade name: ZEONOR, thickness: 50μm, manufactured by ZEON Corporation) was stretched 1.52 times to obtain Re(550) with a retardation of 140nm Film B (thickness: 35 μm).

Production Example 5 (Preparation of retardation film C) Using retardation film A as a substrate, a _{sputtering target containing Al, SiO 2} and ZnO was used on the first retardation film of the aforementioned substrate by DC magnetron sputtering A first oxide layer (thickness: 30 nm) is 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 layer laminate. In this way, a retardation film C having a configuration of the second retardation layer/acrylic adhesive layer/first retardation film/first oxide layer (AZO)/second oxide layer (SiO ₂ ) was produced.

Production Example 6 (Preparation of an optical film laminate) A laminate with a 9μm thick polyvinyl alcohol (PVA) layer was formed on an amorphous polyethylene terephthalate (PET) substrate, and the elongation temperature was 130°C. Use the air-assisted extension to generate an extended layered body. Next, the stretched laminate is dyed to produce a colored laminate, and then the colored laminate is stretched with boric acid in water at a stretching temperature of 65°C to produce a total stretch magnification of 5.94 times. It is stretched together with the amorphous PET substrate. An optical film laminate with a 5μm thick PVA layer. With this two-stage extension, the PVA molecules that can form a PVA layer formed on an amorphous PET substrate are in high-dimensional alignment, and the iodine adsorbed by dyeing is high in the same direction in the form of polyiodide ion complexes. A high-performance polarizing film (polarizer) with three-dimensional alignment, and an optical thin film laminate containing a PVA layer with a thickness of 5 μm is produced.

Production Example 7 (Preparation of a rubber-based adhesive composition) 100 parts by weight of polyisobutylene (trade name: OPPANOL B80, Mw: about 750,000, manufactured by BASF), as a polyfunctional radical polymerizable compound, tricyclodecane Methanol diacrylate (trade name: NK Ester A-DCP, bifunctional acrylate, molecular weight: 304, manufactured by Shinnakamura Chemical Industry Co., Ltd.) 5 parts by weight, hydrogen abstraction type photopolymerization initiator diphenyl ketone (and A toluene solution (adhesive solution) prepared by blending 0.5 part and 10 parts by weight of fully hydrogenated terpene phenol (manufactured by Ko Pure Chemical Industries, Ltd.) was adjusted to a solid content of 15% by weight to prepare a rubber-based adhesive composition (solution ).

Production Example 8 (Preparation of a rubber-based adhesive composition) 100 parts by weight of polyisobutylene (trade name: OPPANOL B80, Mw: about 750,000, manufactured by BASF), as a polyfunctional radical polymerizable compound, tricyclodecane Methanol diacrylate (trade name: NK Ester A-DCP, bifunctional acrylate, molecular weight: 304, manufactured by Shinnakamura Chemical Industry Co., Ltd.) 10 parts by weight, hydrogen abstraction type photopolymerization initiator diphenyl ketone (and A toluene solution (adhesive solution) prepared by blending 0.5 part and 10 parts by weight of fully hydrogenated terpene phenol (manufactured by Ko Pure Chemical Industries, Ltd.) was adjusted to a solid content of 15% by weight to prepare a rubber-based adhesive composition (solution ).

Production Example 9 (Preparation of Acrylic Adhesive Composition) In a separate flask equipped with a thermometer, a stirrer, a reflow cooling tube, and a nitrogen introduction tube, 99 parts by weight of butyl acrylate (BA) and 4-hydroxybutyl acrylate were charged as the monomer component After 1 part by weight of ester (4HBA), 0.2 part by weight of azobisisobutyronitrile as a polymerization initiator, and ethyl acetate as a polymerization solvent with a solid content of 20%, pour in nitrogen and stir for about 1 hour The nitrogen is substituted. After that, 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 above-mentioned acrylic polymer solution (100 parts by weight of solid content), 0.8 parts by weight of trimethylolpropane methylene diisocyanate (trade name: Corona L, manufactured by Nippon Polyurethane Industry Co., Ltd.) as an isocyanate-based crosslinking agent was added 1. 0.1 parts by weight of 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 is applied to a 38μm thick polyester film (trade name: DIAFOIL MRF, manufactured by Mitsubishi Plastics Co., Ltd.) that has been peeled off with silicone on one side. ) Is peeled off the treated surface to form a coating layer. Next, the coating layer was dried at 120° C. for 3 minutes to form an adhesive layer to produce an adhesive sheet with an adhesive layer thickness of 50 μm. In addition, a 38 μm thick polyester film (trade name: DIAFOIL MRF, manufactured by Mitsubishi Resin Co., Ltd.), which had been peeled off on one side with silicone, was pasted so that the peeled surface was in contact with the adhesive layer. It is bonded to the adhesive surface of the adhesive sheet to obtain an acrylic 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) The rubber-based adhesive composition (solution) obtained in Production Example 7 was coated on a polyester film with a thickness of 38 μm (trade name: DIAFOIL MRF, Mitsubishi Resin (made by stock) is peeled off the surface to form a coating layer. Next, the coating layer was dried at 80° C. for 3 minutes to form an adhesive layer to produce an adhesive sheet with an adhesive layer thickness of 50 μm. In addition, a 38 μm thick polyester film (trade name: DIAFOIL MRF, manufactured by Mitsubishi Resin Co., Ltd.), which had been peeled off on one side with silicone, was pasted so that the peeled surface was in contact with the adhesive layer. 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).

The other separating piece is peeled off, and ultraviolet rays are irradiated from the side of the separated piece at room temperature to obtain an adhesive sheet composed of a rubber-based adhesive layer/separating piece. The aforementioned ultraviolet radiation is 1000 mJ/cm ² in the UVA region.

(Preparation of retardation film with adhesive layer) The second retardation layer of retardation film A obtained in Production Example 3 was bonded to the rubber-based adhesive sheet obtained above to obtain a retardation film A/rubber-based adhesive layer/ The separated parts constitute a laminate.

(Method for making polarizing film) On the surface of the polarizing film (polarizer, thickness: 5μm) 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 0.1μm. After combining a protective film (triacetyl cellulose (TAC) film (trade name: KC4UYW, thickness: 40 μm, manufactured by Konica Minolta)), it was dried at 50°C for 5 minutes. Then the amorphous PET substrate was peeled off to produce A single-sided protective polarizing film using a thin polarizer. The retardation film A of the aforementioned laminate is bonded to the polarizing film side of the obtained single-sided protective polarizing film through a polyvinyl alcohol-based adhesive. Here, a synthetic retardation film is pasted The slow axis of A is 45° counterclockwise with respect to the absorption axis of the polarizer. The resulting polarizing film is composed of TAC film/adhesive layer/polarizer/adhesive layer/phase difference film A/rubber-based adhesive layer/separator The structure of the composition.

Example 2 (Preparation of a retardation film with an 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 Manufacturing Example 4 was used as the retardation film /Layered body composed of separate parts.

(Method for producing polarizing film) A polarizing film was produced in the same manner as in Example 1, except that the laminate obtained above was used. The obtained polarizing film has a structure composed of TAC film/adhesive layer/polarizer/adhesive layer/phase difference film B/rubber-based adhesive layer/separator.

Comparative Example 1 (Preparation of a retardation film with an adhesive layer) A retardation film A/acrylic film was prepared in the same manner as in Example 1, except that the acrylic adhesive layer obtained in Manufacturing Example 9 was used instead of the rubber-based adhesive layer A laminate composed of adhesive layers/separators.

(Method for producing polarizing film) A polarizing film was produced in the same manner as in Example 1, except that the laminate obtained above was used. The obtained polarizing film has a structure composed of TAC film/adhesive layer/polarizer/adhesive layer/retardation film A/acrylic adhesive layer/separator.

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

<Measuring the moisture permeability of the adhesive layer> A triacetyl cellulose film (TAC film, thickness: 25μm, manufactured by Konica Minolta Co., Ltd.) was bonded to the adhesive sheet obtained in the Examples and Comparative Examples (the thickness of the adhesive layer: 50μm) ) The adhesive surface. Then, the release liner of the adhesive sheet was peeled off to obtain a sample for measurement. Next, using this sample for measurement, the moisture permeability (water vapor transmission rate) was measured by the moisture permeability test method (cup method, in accordance with 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 measurement.

<Measurement of the moisture permeability of the retardation film with the adhesive layer> The layered body obtained in Examples and Comparative Example 1 was peeled off the separator, and the adhesive surface was exposed, and it was used as a sample for measurement. Next, using this sample for measurement, the moisture permeability (water vapor transmission rate) was measured by the moisture permeability test method (cup method, in accordance with 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 measurement.

<Durability> After peeling off the separator of the polarizing film with the adhesive layer obtained in the Examples and Comparative Examples and bonding the test piece to the glass plate, put it in an environment of 85°C for 300 hours and then use the naked eye or magnifying glass (20 Times) observe its state. Use the following evaluation criteria for evaluation. ◎: Confirm with a magnifying glass that no defects (foaming, peeling, etc.) still occur. ○: No defects were observed with the naked eye, but some defects were confirmed under the magnifying glass to the extent that they were not problematic in use. ×: Defects can be observed with the naked eye.

<Viewing angle characteristics> The polarizing films obtained in 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 off, and the cut polarizing film was attached instead to obtain the organic EL panel. The measurement results of the reflection hue of the organic EL panel are listed in the table. In addition, the "viewing angle characteristic" represents the distance Δxy between the two points of the reflection hue in the front direction and the reflection hue in the oblique direction (the maximum or minimum polar angle of 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 viewing angle measurement and evaluation device made by Auoronic-MERCHERS, a conoscope. ○: 0.07 or less, good reflection characteristics, and can be used as an organic EL device. ×: Less than 0.07, poor reflection characteristics, and cannot be used as an organic EL device.

[Table 1]

The tables 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 <Multifunctional radical polymerizable compound> A-DCP : Tricyclodecane dimethanol diacrylate (trade name: NK Ester A-DCP, bifunctional acrylate, molecular weight: 304, manufactured by Shinnakamura Chemical Industry Co., Ltd.) <Photoinitiator> Diphenyl ketone: Hydrogen type photopolymerization initiator <tackifier> Completely hydrogenated terpene phenol: Completely hydrogenated terpene phenol 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-side protective polarizing film 5B‧‧‧Double-sided protective polarizing film 5a‧‧‧Polarizer 5b‧‧‧Protection 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 the optical film for an organic EL display device of the present invention. Fig. 2 is a cross-sectional view schematically showing an embodiment of the optical film for an organic EL display device of the present invention. Fig. 3(a) is a cross-sectional view schematically showing an embodiment of the polarizing film for an organic EL display device of the present invention. (b) is a cross-sectional view schematically showing an embodiment of the polarizing film for an organic EL display device of the present invention. 4 is a cross-sectional view schematically showing one embodiment of the 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 that functions as a λ/4 plate and an adhesive layer; the adhesive layer has a moisture permeability of 50g/at 40°C and 92%RH (m ² .day) or less, and the adhesive layer is an adhesive layer formed of a rubber-based adhesive composition containing polyisobutylene and a hydrogen-abstracting photopolymerization initiator; the retardation film can be used as λ/ A 4-plate functional film, and its in-plane retardation Re(550) measured at 23°C with light with a wavelength of 550nm is 100~180nm, and the in-plane retardation Re is Re=(nx-ny)× d (d: film thickness (nm)). The optical film for an organic EL display device according to claim 1, wherein the rubber-based adhesive composition further contains a polyfunctional radical polymerizable compound. A polarizing film for an organic EL display device, which is characterized by containing a polarizer and the optical film for an organic EL display device as claimed in claim 1 or 2. The polarizing film for an organic EL display device according to claim 3, wherein the thickness of the aforementioned polarizing member is 15 μm or less. For example, the polarizing film for organic EL display device of claim 3 or 4, which in turn has: the aforementioned polarizer, a retardation film functioning as a λ/4 plate, and a moisture permeability of 50g/at 40°C and 92%RH (m ² .day) or less adhesive layer. For example, the polarizing film for organic EL display device of claim 3 or 4, which in turn includes: the aforementioned polarizer, an adhesive layer with a ^{moisture permeability of 50g/(m 2 .day) or less at 40°C and 92%RH,} And a retardation film that functions as a λ/4 plate. An adhesive layer-attached polarizing film for an organic EL display device, 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 characterized by having 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.

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