WO2013077220A1 - 有機エレクトロルミネッセンス表示装置及び円偏光板 - Google Patents
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Images
Classifications
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3083—Birefringent or phase retarding elements
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/85—Arrangements for extracting light from the devices
- H10K50/858—Arrangements for extracting light from the devices comprising refractive means, e.g. lenses
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/86—Arrangements for improving contrast, e.g. preventing reflection of ambient light
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B2207/00—Coding scheme for general features or characteristics of optical elements and systems of subclass G02B, but not including elements and systems which would be classified in G02B6/00 and subgroups
- G02B2207/113—Fluorescence
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K2101/00—Properties of the organic materials covered by group H10K85/00
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/84—Passivation; Containers; Encapsulations
- H10K50/844—Encapsulations
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/80—Constructional details
- H10K59/875—Arrangements for extracting light from the devices
- H10K59/879—Arrangements for extracting light from the devices comprising refractive means, e.g. lenses
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/80—Constructional details
- H10K59/8791—Arrangements for improving contrast, e.g. preventing reflection of ambient light
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
- H10K71/70—Testing, e.g. accelerated lifetime tests
Definitions
- the present invention relates to a circularly polarizing plate having a ⁇ / 4 retardation film, and an organic electroluminescence display device comprising the circularly polarizing plate and an organic electroluminescence element.
- organic electroluminescence element (hereinafter abbreviated as an organic EL element) that emits light when a light emitting layer is provided between electrodes and a voltage is applied thereto is a flat illumination, a light source for an optical fiber, a backlight for a liquid crystal display, a liquid crystal Research and development are actively conducted as various light sources such as projector backlights and display devices.
- the organic EL element is a light emitting element that has attracted much attention in recent years because it exhibits excellent characteristics in terms of light emission efficiency, low voltage driving, light weight, and low cost.
- the organic EL element injects electrons from the cathode and holes from the anode and recombines them in the light emitting layer, thereby generating visible light emission corresponding to the light emitting characteristics of the light emitting layer.
- the anode is mainly composed of indium tin oxide (hereinafter abbreviated as ITO) because it has the highest electrical conductivity among transparent conductive materials, a relatively large work function, and high hole injection efficiency. ) Is used.
- ITO indium tin oxide
- a metal electrode is usually used for the cathode, but considering the electron injection efficiency, from the viewpoint of work function, materials such as Mg, Mg / Ag, Mg / In, Al, Li / Al are mainly used. Is used.
- These metal materials have high light reflectivity, and in addition to the function as an electrode (cathode), they also have a function of reflecting light emitted from the light emitting layer and increasing the amount of emitted light (light emission luminance). That is, the light emitted in the cathode direction is mirror-reflected on the surface of the metal material that is the cathode, and is extracted as emitted light from the transparent ITO electrode (anode).
- the cathode since the cathode has a mirror surface with high light reflectivity, external light reflection is noticeable in a state where no light is emitted.
- the reflection of indoor lighting is intense, and black color cannot be expressed in a bright place, and there is a problem that the bright room contrast is extremely low when used as a light source for a display device.
- JP-A-8-321381 discloses a method of using a circularly polarizing element (also referred to as a circularly polarizing plate).
- This circularly polarizing plate is generally composed of a protective film, a polarizer, and a ⁇ / 4 retardation film from the viewing side.
- the ⁇ / 4 retardation film used in the circularly polarizing plate is a thin film and has a ⁇ / 4 difference because it exhibits a high retardation.
- stretching at a high magnification is required.
- the ⁇ / 4 retardation film produced by such high-stretching is easily affected by the temperature and humidity conditions of the environment to be stored, organic solvents, etc. For example, it has been found that the dimensional change becomes large when stored in a high temperature and high humidity environment.
- the organic electroluminescence display device since only one circularly polarizing plate is used on the viewing side, the curling characteristics of the circularly polarizing plate itself greatly affects the warpage of the organic electroluminescence display device. In particular, it has been found that when it is repeatedly used under conditions where the environmental changes of humidity and temperature are large, the organic electroluminescence display device is greatly deteriorated.
- an elliptically polarizing element having a laminated structure in which a polarization separation film and a quarter wavelength plate are bonded via an adhesive layer having excellent stress relaxation properties is disclosed (for example, see Patent Documents 1 and 2).
- the pressure-sensitive adhesive layer disclosed here is a layer mainly composed of an acrylic polymer and having a relaxation elastic modulus in the range of 0.2 to 10 MPa, and an internal stress generated inside the laminate by heat. The object is to reduce light reflection loss and increase the light use efficiency by preventing photoelastic deformation due to relaxation.
- a linear polarizing plate, a first adhesive layer, a retardation plate, a second adhesive layer, an optical compensation plate (liquid crystal layer), and a third adhesive layer are laminated in this order, and the storage elasticity of the second adhesive layer
- An elliptically polarizing plate having a modulus larger than the storage elastic modulus of the third adhesive layer is disclosed (for example, see Patent Document 3). According to the method disclosed in Patent Document 3, it is possible to provide an elliptically polarizing plate that is a thin film, in which the generation of cracks in a thermal shock test is suppressed, and the generation of wrinkles due to the shrinkage of the linear polarizing plate is suppressed.
- organic electroluminescence elements have the property of being easily deteriorated by being affected by ultraviolet rays, and high ultraviolet absorption is achieved at any position between the protective film constituting the circularly polarizing plate and the surface of the organic electroluminescence elements. It is desirable to give performance.
- the amount of the ultraviolet absorber added to the protective film is increased in order to impart a high ultraviolet absorbing ability, the haze increases and causes problems such as bleeding out.
- the surface treatment layer is applied on the protective film, there is a concern that the ultraviolet absorber present in excess in the protective film may be eluted.
- a ⁇ / 4 retardation film produced by high-stretching is used, and in particular, color tone stability when stored for a long time in a high-temperature and high-humidity environment, dimensional stability, Development of a circularly polarizing plate excellent in warpage resistance and external light reflection suppression performance and an organic electroluminescence display device incorporating the same is desired.
- the present invention has been made in view of the above-mentioned problems, and the problem is visibility, durability (image unevenness resistance) and panel deterioration resistance (flatness) when stored for a long time in a high temperature and high humidity environment.
- An object is to provide an excellent circularly polarizing plate and an organic electroluminescence display device using the same.
- the electroluminescence display device is an organic electroluminescence display device having a protective film, a polarizer, a ⁇ / 4 retardation film and an organic electroluminescence element in this order from the viewing side, and at least the ⁇ / 4 retardation film.
- One surface could be realized by an organic electroluminescence display device characterized by having a layer A having a storage elastic modulus in the range of 100 to 500 MPa.
- An organic electroluminescence display device having a protective film, a polarizer, a ⁇ / 4 retardation film and an organic electroluminescence element in this order from the viewing side, wherein at least one surface of the ⁇ / 4 retardation film has storage elasticity
- An organic electroluminescence display device comprising a layer A having a rate in the range of 100 to 500 MPa.
- the dimensional change rate difference C (%) defined by the following formula (1) between the protective film and the ⁇ / 4 retardation film having the layer A is in the range of 0.1 to 10.0%.
- the layer A has between the polarizer and the ⁇ / 4 retardation film, and has a layer B between the protective film and the polarizer, and the storage elastic modulus of the layer A is stored elastic.
- the organic electro according to the first or second aspect wherein the relationship of storage elastic modulus A> storage elastic modulus B is satisfied, where the modulus is A and the storage elastic modulus of the layer B is the storage elastic modulus B.
- Item 4 The organic electroluminescence display device according to any one of Items 1 to 3, wherein the layer A has an absorption maximum in a wavelength region of 200 to 400 nm.
- a circularly polarizing plate having at least a protective film, a polarizer and a ⁇ / 4 retardation film in this order, wherein at least one surface of the ⁇ / 4 retardation film has a storage elastic modulus in the range of 100 to 500 MPa.
- a circularly polarizing plate having a layer A.
- the dimensional change rate difference C (%) defined by the following formula (1) between the protective film and the ⁇ / 4 retardation film having the layer A is in the range of 0.1 to 10.0%.
- Item 7 The circularly polarizing plate according to item 6, wherein
- the layer A has between the polarizer and the ⁇ / 4 retardation film, and has a layer B between the protective film and the polarizer, and the storage elastic modulus of the layer A is stored elastic.
- Item 9 The circularly polarizing plate according to any one of Items 6 to 8, wherein the layer A has an absorption maximum in a wavelength region of 200 to 400 nm.
- Item 10 The circularly polarizing plate according to any one of Items 6 to 9, wherein the layer A includes an ultraviolet curable resin.
- Circularly polarized light having a ⁇ / 4 retardation film excellent in visibility, durability (image unevenness resistance) and panel deterioration resistance (flatness) when stored for a long time in a high temperature and high humidity environment according to the present invention A plate and an organic electroluminescence display device using the plate can be provided.
- FIG. 3A Schematic diagram illustrating an example of the stretching direction in the oblique stretching tenter shown in FIG. 3A
- the organic electroluminescence display device of the present invention is an organic electroluminescence display device having a protective film, a polarizer, a ⁇ / 4 phase difference film, and an organic electroluminescence element in this order from the viewing side, and the ⁇ / 4 phase difference.
- a layer A having a storage elastic modulus in a range of 100 to 500 MPa is provided on at least one surface of the film.
- the circularly polarizing plate of the present invention is a circularly polarizing plate having at least a protective film, a polarizer, and a ⁇ / 4 retardation film in this order, and at least one surface of the ⁇ / 4 retardation film has storage elasticity. It has a layer A whose rate is in the range of 100 to 500 MPa. This feature is a technical feature common to the inventions according to claims 6 to 10.
- the organic electroluminescence display device of the present invention according to claim 1 (hereinafter also referred to as an organic EL display device) or the circularly polarizing plate according to claim 6 comprises a protective film, a polarizer, a ⁇ / 4 retardation, from the viewing side.
- the present invention provides a circularly polarizing plate provided with a four retardation film and an organic electroluminescence display device using the circularly polarizing plate.
- an organic electroluminescence display device having a protective film, a polarizer, a ⁇ / 4 retardation film and an organic electroluminescence element in this order, and at least one surface of the ⁇ / 4 retardation film has storage elasticity.
- the layer A having a rate in the range of 100 to 500 MPa, it is possible to suppress the size of the ⁇ / 4 retardation film, which varies depending on the environmental conditions, and the amount of change in the retardation. Even when stored for a long period of time in the environment, the color variation of the circularly polarizing plate is kept low, the panel warpage is suppressed, and the display device visibility (external light reflection suppression) and UV resistance are excellent.
- a circularly polarizing plate provided with a retardation film and an organic electroluminescence display device using the same can be obtained.
- the difference C (%) in dimensional change (%) between the protective film and the ⁇ / 4 retardation film having the layer A is 0.1 to 10.0%. It is in the range.
- the layer A is provided between the polarizer and the ⁇ / 4 retardation film, and the layer A is further provided between the protective film and the polarizer.
- the storage elastic modulus A is the storage elastic modulus A
- the storage elastic modulus B of the layer B is the storage elastic modulus B
- the relationship of storage elastic modulus A> storage elastic modulus B is satisfied.
- the inventions according to claims 4 and 9 are characterized in that the layer A has an absorption maximum value in the ultraviolet region in the wavelength range of 200 to 400 nm.
- the inventions according to claims 5 and 10 are characterized in that at least one of the resins constituting the layer A is an ultraviolet curable resin.
- a layer having a desired storage elastic modulus can be formed.
- FIG. 1 is a schematic sectional view showing an example of the configuration of the organic electroluminescence display device of the present invention.
- An organic EL display device A is configured by providing a circularly polarizing plate C in which a polarizer 109 is sandwiched between a ⁇ / 4 retardation film 108 and a protective film 110 (also referred to as a polarizing plate protective film) on an organic EL element B having To do. Furthermore, the protective film 110 may have a surface antireflection layer 111 thereon.
- the thickness of the organic EL element B is about 1 ⁇ m excluding the substrate 101.
- a layer A (112) having a storage elastic modulus in the range of 100 to 500 MPa is provided on at least one surface side of the ⁇ / 4 retardation film 108. As shown in FIG. 1, it is particularly preferable to provide between the polarizer 109 and the ⁇ / 4 retardation film 108. Furthermore, the layer A (112) according to the present invention preferably has a characteristic of having ⁇ max in the ultraviolet region with a wavelength of 200 to 400 nm.
- a layer B is further provided between the protective film 110 and the polarizer 109.
- FIG. 2 shows an example of another configuration of the organic electroluminescence display device of the present invention, showing a configuration in which a layer B (113) is provided together with the layer A (112) according to the present invention.
- a layer A (112) is provided between the polarizer 109 and the ⁇ / 4 retardation film 108, and a layer B (113) is further provided between the protective film 110 and the polarizer 109. It is shown.
- the storage elastic modulus of the layer A (112) is the storage elastic modulus A
- the storage elastic modulus of the layer B (113) is the storage elastic modulus B
- the relationship of the storage elastic modulus of each layer is storage. It is preferable that the elastic modulus A> the storage elastic modulus B is satisfied from the viewpoint of efficiently relaxing the stress received by each layer.
- the organic light emitting layer is a laminate of various organic thin films, for example, a laminate of a hole injection layer made of a triphenylamine derivative and the like and a light emitting layer made of a fluorescent organic solid such as anthracene, Alternatively, a structure having various combinations such as a laminate of such a light-emitting layer and an electron injection layer made of a perylene derivative, or a stack of these hole injection layer, light-emitting layer, and electron injection layer is known. It has been. In addition, the detail of each structural requirement of an organic EL element is mentioned later.
- holes and electrons are injected into the organic light-emitting layer by applying a voltage to the transparent electrode and the metal electrode, and the energy generated by recombination of these holes and electrons excites the phosphor material. Then, light is emitted on the principle that the excited fluorescent material emits light when returning to the ground state.
- the mechanism of recombination in the middle is the same as that of a general diode, and as can be predicted from this, the current and the emission intensity show strong nonlinearity with rectification with respect to the applied voltage.
- an organic EL display device in order to extract light emitted from the organic light emitting layer, at least one of the electrodes must be transparent, and a transparent electrode usually formed of a transparent conductor such as indium tin oxide (ITO) is used as an anode. It is used as.
- ITO indium tin oxide
- metal electrodes such as Mg—Ag and Al—Li are used.
- the organic light emitting layer is formed of a very thin film having a thickness of about 10 nm. For this reason, the organic light emitting layer transmits light almost completely like the transparent electrode. As a result, light that is incident from the surface of the transparent substrate at the time of non-light emission, passes through the transparent electrode and the organic light emitting layer, and is reflected by the metal electrode is again emitted to the surface side of the transparent substrate.
- the display surface of the organic EL display device looks like a mirror surface.
- an organic EL display device including an organic EL element having a transparent electrode on the surface side of an organic light emitting layer that emits light when a voltage is applied and a metal electrode on the back surface side of the organic light emitting layer, the surface side of the transparent electrode (visible)
- a polarizing plate can be provided on the side), and a retardation plate can be provided between the transparent electrode and the polarizing plate.
- the retardation plate and the polarizing plate have a function of polarizing light incident from the outside and reflected by the metal electrode, there is an effect that the mirror surface of the metal electrode is not visually recognized by the polarization action.
- the retardation plate is composed of a ⁇ / 4 retardation film and the angle formed by the polarization direction of the polarizing plate and the retardation plate is adjusted to ⁇ / 4, the metal electrode The mirror surface can be completely shielded.
- the external light incident on the organic EL display device is transmitted only by the linearly polarized light component by the polarizing plate, and this linearly polarized light is generally elliptically polarized light by the phase difference plate.
- the plate is a ⁇ / 4 retardation film and the angle between the polarization directions of the polarizing plate and the retardation plate is ⁇ / 4, circular polarization is obtained.
- This circularly polarized light is transmitted through the transparent substrate, the transparent electrode, and the organic thin film, reflected by the metal electrode, is again transmitted through the organic thin film, the transparent electrode, and the transparent substrate, and becomes linearly polarized light again on the retardation plate. And since this linearly polarized light is orthogonal to the polarization direction of a polarizing plate, it cannot permeate
- the circularly polarizing plate of the present invention comprises at least a protective film, a polarizer and a ⁇ / 4 retardation film in this order, and a storage elastic modulus in the range of 100 to 500 MPa on at least one surface of the ⁇ / 4 retardation film. It has the layer A which exists in.
- the slow axis angle (that is, the orientation angle ⁇ ) was set to “substantially 45 °” with respect to the longitudinal direction by oblique stretching, and the elongated polarizing film was elongated.
- the circularly polarizing plate of the present invention preferably has an ultraviolet absorption function in order to prevent deterioration due to ultraviolet rays.
- the protective film on the viewing side has an ultraviolet absorption function, both the polarizer and the organic EL element can be protected from ultraviolet rays, but it is more preferable that the layer A according to the present invention has an ultraviolet absorption function. This is preferable from the viewpoint of suppressing deterioration of the organic EL element.
- the circularly polarizing plate of the present invention uses a stretched polyvinyl alcohol doped with iodine or a dichroic dye as a polarizer, and is bonded in a configuration of ( ⁇ / 4 retardation film) / polarizer / protective film. Can be manufactured.
- the circularly polarizing plate of the present invention can be constituted by further bonding a protective film on one surface of the circularly polarizing plate and a separate film on the opposite surface.
- the protective film and the separate film are used for the purpose of protecting the circularly polarizing plate at the time of shipping the polarizing plate and at the time of product inspection.
- the dimensional change rate difference C (%) defined by the following formula (1) between the protective film described later and the ⁇ / 4 retardation film having the layer A is 0.1-10. It is preferable to be within the range of 0.0%.
- Lp (20 degreeC) is a reference
- Lp (80 degreeC) represents the dimension in 80 degreeC of this Lp (20 degreeC) of a protective film single layer.
- Lq (20 ° C.) is a reference dimension at 20 ° C. of the ⁇ / 4 retardation film having the layer A
- Lq (80 ° C.) is 80 of the Lq (20 ° C.) of the ⁇ / 4 retardation film having the layer A. Denotes dimensions in ° C.
- the protective film single layer was conditioned for 24 hours in an environment conditioned at a temperature of 20 ° C. and a relative humidity of 55%, and then marked with a cutter at an interval of about 10 cm in width and length, and the distance Lp (20 ° C) was measured accurately.
- the distance Lp (80 ° C.) marked with a cutter at an interval of about 10 cm on each of the width and the length is accurate.
- the dimensional change rate (absolute value) A of the protective film was measured by the following formula (2).
- the dimensional change rate difference C between the protective film constituting the circularly polarizing plate of the present invention and the ⁇ / 4 retardation film having the layer A is set within a range of 0.1 to 10.0%, that is, a high temperature
- the dimensional change rate difference C between the protective film defined in the present invention and the ⁇ / 4 retardation film having the layer A within the range of 0.1 to 10.0%.
- the selection of the material constituting the ⁇ / 4 retardation film, and the dimensional change rate of each film This can be achieved by optimizing the storage elastic modulus of the layer A formed on the retardation film.
- Examples of the material constituting the protective film (110 shown in FIG. 1) according to the present invention include cellulose ester-based materials such as triacetyl cellulose film, cellulose acetate propionate film, cellulose diacetate film, and cellulose acetate butyrate film.
- Polyester film such as polyethylene terephthalate, Polyethylene naphthalate, Polycarbonate film, Polyarylate film, Polysulfone (including polyethersulfone) film, Polyethylene film, Polypropylene film, Cellophane, Polyvinylidene chloride film, Polyvinyl alcohol film , Ethylene vinyl alcohol film, syndiotactic polystyrene film, norbornene resin film Polymethyl pentene film, polyether ketone film, polyether ketone imide film, a polyamide film, a fluororesin film, a nylon film, cycloolefin polymer films, and polymethyl methacrylate film, or an acrylic film.
- Polyester film such as polyethylene terephthalate, Polyethylene naphthalate, Polycarbonate film, Polyarylate film, Polysulfone (including polyethersulfone) film, Polyethylene film, Polypropylene film, Cellophane, Polyvinylidene chloride film, Polyvinyl alcohol film
- cellulose ester films for example, Konica Minoltac KC8UX, KC4UX, KC5UX, KC8UCR3, KC8UCR4, KC8UCR5, KC8UY, KC4UY, KC4UE, KC4UA, KC6UA, and KC12UR (above, Konica Layer)
- a polycarbonate film, a cycloolefin polymer film, and a polyester film are preferable.
- a cellulose ester film is preferable from the viewpoints of optical properties, productivity, and cost.
- the arrangement of ⁇ / 4 retardation films on both sides of a polarizer can exert an effect on improving the quality of a display image. Therefore, it is also preferable to use the ⁇ / 4 retardation film according to the present invention as the protective film.
- the direction in which the maximum elastic modulus in the plane of the protective film is preferably in the direction of 35 ° to 55 ° with respect to the longitudinal direction of the screen of the image display device, and By making it parallel to the direction of the maximum elastic modulus, there is no panel deflection, and a high-quality organic electroluminescence display device for 3D image display can be obtained.
- any appropriate polarizer can be adopted depending on the purpose.
- a dichroic substance such as iodine or a dichroic dye is adsorbed on a hydrophilic polymer film such as a polyvinyl alcohol film, a partially formalized polyvinyl alcohol film or an ethylene / vinyl acetate copolymer partially saponified film.
- a hydrophilic polymer film such as a polyvinyl alcohol film, a partially formalized polyvinyl alcohol film or an ethylene / vinyl acetate copolymer partially saponified film.
- examples include uniaxially stretched films, polyene-based oriented films such as polyvinyl alcohol dehydrated products and polyvinyl chloride dehydrochlorinated products.
- a polarizer obtained by adsorbing a dichroic substance such as iodine on a polyvinyl alcohol film and uniaxially stretching is particularly preferable because of its high polarization dichroic ratio.
- the thickness of these polarizers is not particularly limited, but is generally about 1 to 80 ⁇ m.
- a polarizer uniaxially stretched by adsorbing iodine to a polyvinyl alcohol film can be produced, for example, by dyeing polyvinyl alcohol in an aqueous iodine solution and stretching it 3 to 7 times the original length. . If necessary, it may contain boric acid, zinc sulfate, zinc chloride, or the like, or may be immersed in an aqueous solution such as potassium iodide. Further, the polyvinyl alcohol film may be immersed in water and washed before dyeing.
- Stretching may be performed after dyeing with iodine, may be performed while dyeing, or may be dyed with iodine after stretching.
- the film can be stretched in an aqueous solution of boric acid or potassium iodide or in a water bath.
- ⁇ / 4 retardation film means a film having a function of converting linearly polarized light having a specific wavelength into circularly polarized light (or circularly polarized light into linearly polarized light).
- the ⁇ / 4 retardation film is designed so that the in-plane retardation value Ro of the layer is about 1 ⁇ 4 of the predetermined wavelength of light (usually in the visible light region).
- the ⁇ / 4 retardation film according to the present invention has an in-plane retardation Ro (450) in the range of 100 to 130 nm measured with light having a wavelength of 450 nm under an environment of 23 ° C. and 55% RH.
- In-plane retardation Ro (550) measured with 550 nm light is in the range of 130 to 160 nm
- in-plane retardation Ro (650) measured with light of wavelength 650 nm is in the range of 155 to 175 nm. It is preferable to be within.
- the ⁇ / 4 retardation film according to the present invention gives a phase difference of 1 ⁇ 4 wavelength to all the light in the visible light region, that is, reverse wavelength dispersion (Ro (450) ⁇ Ro (550) ⁇ A ⁇ / 4 retardation film having Ro (650)) is preferable.
- Lamination of ⁇ / 4 retardation film and ⁇ / 2 plate can achieve ⁇ / 4 even in the case of positive wavelength dispersion.
- the retardation (Rt) increases in the thickness direction. Visibility decreases due to misalignment and axis misalignment.
- the wavelength dispersion of the ⁇ / 4 retardation film is such that the ratio of Ro (450) / Ro (650) is less than 1.00, preferably 0.97 or less, more preferably 0.95 or less.
- ⁇ / 4 is preferable for green to red with high visual sensitivity, and in particular, the ratio of Ro (550) / Ro (650) is preferably in the range of 0.80 to 0.90.
- the retardation Ro (550) referred to in the present invention is a retardation value represented by the following formula (i).
- n x is a refractive index in the slow axis x direction in the film plane
- n y is a refractive index in the y direction perpendicular to the x direction in the film plane
- d is the thickness of film (nm) To express.
- Each refractive index is measured at a measurement wavelength of 550 nm in an environment of 23 ° C. and 55% RH.
- retardation Ro (650) is a retardation value represented by the above formula (i) measured at a wavelength of 650 nm.
- Ro defined in the present invention can be measured using an automatic birefringence meter.
- an automatic birefringence meter KOBRA-21ADH manufactured by Oji Scientific Instruments
- a circularly polarizing plate is obtained by laminating so that the angle between the slow axis of the ⁇ / 4 retardation film and the transmission axis of the polarizer is substantially 45 °. That is, both the ⁇ / 4 retardation film and the polarizer are in the form of a long film, and the angle of the slow axis with respect to the longitudinal direction of the base film of the ⁇ / 4 retardation film (that is, the orientation angle ⁇ ) is When it is “substantially 45 °”, the longitudinal direction is aligned and laminated with a polarizer having a transmission axis or an absorption axis in a direction parallel to the longitudinal direction of the polarizing film, so that it is long with good productivity.
- a circularly polarizing film can be formed.
- the orientation angle ⁇ with respect to the longitudinal direction of the base film is preferably “substantially 45 °”.
- “substantially 45 °” is preferably in the range of 35 to 55 ° with the longitudinal direction as a base point.
- the orientation angle ⁇ of the ⁇ / 4 retardation film according to the present invention is preferably in the range of 40 to 50 °, more preferably in the range of 42 to 48 °, and 43 to 47 °. Is more preferable, and the range of 44 to 46 ° is most preferable.
- the ⁇ / 4 retardation film according to the present invention has a high retardation development property, and even when it is a retardation film having a high retardation, it can be thinned to exhibit a high retardation. Even when the film is stretched at a high magnification, it has excellent visibility and durability when stored for a long period of time in a high temperature and high humidity environment, and excellent saponification properties.
- the resin material that can be used for the production of the ⁇ / 4 retardation film according to the present invention is not particularly limited, but is a cellulose resin (for example, cellulose acetate, cellulose acylate, etc.), a polycarbonate resin, a cycloolefin resin. Resins are preferred.
- the cellulose resins applicable to the present invention is cellulose acetate.
- the cellulose acetate preferably has an average degree of acetyl group substitution of 2.00 or more, more preferably in the range of 2.00 to 2.95, and further in the range of 2.20 to 2.90. preferable.
- the average acetyl group average substitution degree here means the average number of esterified (acetylated) hydroxy groups (hydroxyl groups) among the three hydroxy groups (hydroxyl groups) of each anhydroglucose constituting cellulose. Value, indicating a value in the range of 0 to 3.0.
- the portion not substituted with an acetyl group usually exists as a hydroxy group (hydroxyl group).
- the degree of substitution of the acetyl group was determined by the method prescribed in ASTM-D817-96 (test method for cellulose acetate etc.).
- the number average molecular weight (Mn) of the cellulose acetate according to the present invention is preferably in the range of 30,000 to 300,000 from the viewpoint of obtaining a film having high mechanical strength. Furthermore, the thing of the range of 50,000-200,000 is preferable.
- the value of the ratio Mw / Mn of the weight average molecular weight (Mw) and the number average molecular weight (Mn) of the cellulose acetate is preferably in the range of 1.4 to 3.0.
- the weight average molecular weight Mw and number average molecular weight Mn of cellulose acetate can be determined by measurement using gel permeation chromatography (GPC).
- the cellulose that is a raw material of cellulose acetate is not particularly limited, and examples thereof include cotton linter, wood pulp, and kenaf. Moreover, the cellulose ester obtained from them can be mixed and used in arbitrary ratios, respectively.
- the cellulose acetate according to the present invention can be produced by a known method.
- cellulose is mixed with raw material cellulose, a predetermined organic acid (such as acetic acid), acid anhydride (such as acetic anhydride), and a catalyst (such as sulfuric acid) to esterify (acetylate) cellulose, The reaction proceeds until ester (acetylation) is formed.
- ester acetylation
- triester acetylation
- the three hydroxy groups (hydroxyl groups) of the glucose unit are substituted with acetyl groups of organic acids.
- cellulose acetate having a desired degree of acetyl group substitution is synthesized by hydrolyzing the cellulose triester. Thereafter, cellulose acetate can be obtained through steps such as filtration, precipitation, washing with water, dehydration, and drying.
- the retardation development property is high, and even when the retardation film has a high retardation, it can be thinned and a high retardation is exhibited.
- cellulose acylate can also be applied, and the average value of the total acyl group substitution degree of the cellulose acylate is One preferred embodiment is to use a film having a range of 1.00 to 3.00.
- the average value of the degree of substitution of acyl groups having 3 or more carbon atoms is preferably in the range of 0.90 to 2.50.
- the method for measuring the degree of acyl group substitution defined in the present invention can be carried out in accordance with ASTM D-817-91.
- the average value of the total acyl group substitution degree is preferably in the range of 1.00 to 3.00, more preferably in the range of 2.00 to 2.90, and particularly preferably 2.40. Within the range of ⁇ 2.75.
- the average value of the degree of substitution of acyl groups having 3 or more carbon atoms is preferably in the range of 0.50 to 2.50, more preferably in the range of 0.80 to 2.00. Particularly preferably, it is in the range of 1.00 to 1.70.
- the film is not damaged by the alkali saponification treatment at the time of producing the circularly polarizing plate, and can sufficiently function as a protective film.
- the upper limit of the total acyl group substitution degree of cellulose acylate is 3.00 in terms of structure.
- acyl group substitution degree of 3 or more carbon atoms of cellulose acylate is 0.90 or more, hydrophobicity can be imparted to the ⁇ / 4 plate, and the effect of improving the durability of the organic EL device according to the present invention can be achieved. If it can be obtained and it is 2.50 or less, sufficient adhesiveness with a polarizer can be obtained, and preparation of a polarizing plate becomes easy.
- the acyl group having 3 or more carbon atoms is preferably a propionyl group.
- the number average molecular weight (Mn) of the cellulose acylate is preferably in the range of 30,000 to 300,000 because the mechanical strength of the resulting film is strong. Furthermore, it is preferably in the range of 50,000 to 200,000.
- the ratio Mw / Mn of the weight average molecular weight (Mw) and the number average molecular weight (Mn) of the cellulose acylate is preferably in the range of 1.4 to 3.0.
- the number average molecular weight (Mn) and weight average molecular weight (Mw) of cellulose acetate can be measured using the above-mentioned gel permeation chromatography (GPC).
- the cellulose acylate according to the present invention can be obtained by acylating the aforementioned cellulose raw material.
- the acylating agent is an acid anhydride (for example, acetic anhydride, propionic anhydride, butyric anhydride, etc.)
- an organic acid such as acetic acid or an organic solvent such as methylene chloride
- a proton such as sulfuric acid is used.
- the synthesis is performed using a sex catalyst.
- the acylating agent is acid chloride (for example, CH 3 COCl, C 2 H 5 COCl, C 3 H 7 COCl, etc.)
- the reaction is carried out using a basic compound such as amine as a catalyst. Is called.
- the cellulose acylate applicable to the present invention can be produced by a known method. Specifically, it can be synthesized with reference to the method described in JP-A-10-45804.
- the cellulose ester applicable to the ⁇ / 4 retardation film according to the present invention is a carboxylic acid ester having about 2 to 22 carbon atoms or an aromatic carboxylic acid ester, and particularly a lower fatty acid ester having 6 or less carbon atoms. It is preferable that
- the acyl group bonded to the hydroxy group may be linear or branched or may form a ring. Furthermore, another substituent may be substituted. In the case of the same degree of substitution, birefringence decreases when the number of carbon atoms is large. Therefore, the number of carbon atoms is preferably selected from acyl groups having 2 to 6 carbon atoms.
- the cellulose ester preferably has 2 to 4 carbon atoms, more preferably 2 to 3 carbon atoms.
- Specific cellulose esters include cellulose acetate propionate, cellulose acetate butyrate, cellulose acetate propionate group, butyrate group or phthalyl group in addition to acetyl groups such as cellulose acetate propionate butyrate or cellulose acetate phthalate.
- the mixed fatty acid ester can be used.
- the butyryl group forming butyrate may be linear or branched.
- cellulose ester preferably used in the present invention, cellulose acetate, cellulose acetate butyrate, and cellulose acetate propionate are particularly preferably used. Of these, cellulose acetate propionate is most preferred.
- the cellulose ester preferably satisfies the following formulas (1) and (2) and has a total acyl group substitution degree of 2.0 to 2.9.
- Formula (1) 2.0 ⁇ X + Y ⁇ 2.9 Formula (2) 0 ⁇ Y ⁇ 1.5
- X is the degree of substitution of the acetyl group
- Y is the degree of substitution of the propionyl group or butyryl group, or a mixture thereof.
- the degree of substitution of the acetyl group and the degree of substitution of other acyl groups can be determined by the method prescribed in ASTM-D817-96.
- resins having different degrees of substitution may be mixed and used.
- the mixing ratio is preferably in the range of 10:90 to 90:10 (mass ratio).
- cellulose acetate propionate is particularly preferably used.
- cellulose acetate propionate 1.0 ⁇ X ⁇ 2.5, and preferably 0.1 ⁇ Y ⁇ 2.0 and 2.0 ⁇ X + Y ⁇ 2.9.
- the number average molecular weight of the cellulose ester used in the present invention is preferably in the range of 60,000 to 300,000, and the resulting film is preferably strong in mechanical strength. Furthermore, 70,000-200000 are preferably used.
- the weight average molecular weight Mw and the number average molecular weight Mn of the cellulose ester can be measured using the above-mentioned gel permeation chromatography (GPC).
- the cellulose ester can be produced by a known method. Specifically, it can be synthesized with reference to the method described in JP-A-10-45804.
- the polycarbonate resin that can be used for the production of the ⁇ / 4 retardation film according to the present invention is preferably an aromatic polycarbonate obtained by a reaction between an aromatic dihydric phenol and a carbonate precursor.
- the aromatic polycarbonate used in the present invention is not particularly limited as long as it is an aromatic polycarbonate capable of obtaining desired properties of the film.
- a polymer material collectively referred to as polycarbonate is a generic term for a polymer material in which a polycondensation reaction is used in its synthesis method and the main chain is linked by a carbonic acid bond. , Phosgene, diphenyl carbonate and the like obtained by polycondensation.
- an aromatic polycarbonate represented by a repeating unit having 2,2-bis (4-hydroxyphenyl) propane called bisphenol-A as a bisphenol component is preferably selected.
- bisphenol derivatives should be selected as appropriate.
- an aromatic polycarbonate copolymer can be constituted.
- such copolymer components include bis (4-hydroxyphenyl) methane, 1,1-bis (4-hydroxyphenyl) cyclohexane, 9,9-bis (4-hydroxyphenyl) fluorene, 1, 1-bis (4-hydroxyphenyl) -3,3,5-trimethylcyclohexane, 2,2-bis (4-hydroxy-3-methylphenyl) propane, 2,2-bis (4-hydroxyphenyl) -2- Phenylethane, 2,2-bis (4-hydroxyphenyl) -1,1,1,3,3,3-hexafluoropropane, bis (4-hydroxyphenyl) diphenylmethane, bis (4-hydroxyphenyl) sulfide, bis (4-hydroxyphenyl) sulfone, 1,1-bis (4-hydroxyphenyl) -3,3,5- It can be mentioned trimethyl cyclohexane.
- the viscosity average molecular weight of the aromatic polycarbonate used here is preferably used if it is within the range of 10,000 to 200,000.
- the viscosity average molecular weight is particularly preferably in the range of 20000 to 120,000.
- a resin having a viscosity average molecular weight of 10,000 or more By using a resin having a viscosity average molecular weight of 10,000 or more, a film having sufficient mechanical strength can be obtained. If the average molecular weight is 200,000 or less, the viscosity of the dope to be prepared does not become too large. , Easy to handle.
- the viscosity average molecular weight can be measured by commercially available high performance liquid chromatography or the like.
- JP-A-2006-131660, JP-A-2006-143732, JP-A-2006-232728, JP-A-2008-163107, JP-A-2008-222965, JP-A-2008-285638, Polycarbonate resins described in JP-A 2010-134232, JP-A 2010-241883, JP-A 2010-261008, JP-A 2011-148842, JP-A 2011-168742, etc. are appropriately selected. Can be used.
- Polypropylene resin that can be used for producing the ⁇ / 4 retardation film according to the present invention is preferably polypropylene or polyethylene resin, but is not limited thereto. Two or more compatible resins may be used as these resins. Specific examples include compounds described in JP-A-2007-316603.
- a cycloolefin resin among the polyolefin resins is preferable to use.
- the cycloolefin resin applicable to the present invention is a polymer resin containing an alicyclic structure.
- a preferred cycloolefin resin is a resin obtained by polymerizing or copolymerizing a cyclic olefin.
- cyclic olefin examples include norbornene, dicyclopentadiene, tetracyclododecene, ethyltetracyclododecene, ethylidenetetracyclododecene, tetracyclo [7.4.0.110, 13.02,7] trideca-2, Polycyclic unsaturated hydrocarbons such as 4,6,11-tetraene and derivatives thereof; cyclobutene, cyclopentene, cyclohexene, 3,4-dimethylcyclopentene, 3-methylcyclohexene, 2- (2-methylbutyl) -1-cyclohexene Monocyclic unsaturated hydrocarbons such as cyclooctene, 3a, 5,6,7a-tetrahydro-4,7-methano-1H-indene, cycloheptene, cyclopentadiene, cyclohexadiene, and derivatives thereof.
- cyclic olefins may have a polar group as a substituent.
- the polar group include a hydroxy group, a carboxy group, an alkoxyl group, an epoxy group, a glycidyl group, an oxycarbonyl group, a carbonyl group, an amino group, an ester group, and a carboxylic acid anhydride group.
- a carboxy group or a carboxylic anhydride group is preferred.
- Preferred cycloolefin resins may be those obtained by addition copolymerization of monomers other than cyclic olefins.
- the addition copolymerizable monomer include ethylene or ⁇ -olefin such as ethylene, propylene, 1-butene and 1-pentene; 1,4-hexadiene, 4-methyl-1,4-hexadiene, 5- And dienes such as methyl-1,4-hexadiene and 1,7-octadiene.
- the cyclic olefin can be obtained by an addition polymerization reaction or a metathesis ring-opening polymerization reaction.
- the polymerization reaction is usually performed in the presence of a catalyst.
- addition polymerization catalyst examples include a polymerization catalyst composed of a vanadium compound and an organoaluminum compound.
- a polymerization catalyst comprising a metal halide such as ruthenium, rhodium, palladium, osmium, iridium, platinum, nitrate or acetylacetone compound, and a reducing agent; or titanium, vanadium, zirconium, tungsten, molybdenum
- a polymerization catalyst composed of a metal halide such as acetylacetone compound and an organoaluminum compound.
- the polymerization temperature, pressure and the like are not particularly limited, but the polymerization is usually carried out at a polymerization temperature of ⁇ 50 to 100 ° C. and a polymerization pressure of 0 to 490 N / cm 2 .
- the cycloolefin-based resin is preferably a resin obtained by polymerizing or copolymerizing a cyclic olefin, followed by a hydrogenation reaction to convert unsaturated bonds in the molecule into saturated bonds.
- the hydrogenation reaction is performed by blowing hydrogen in the presence of a known hydrogenation catalyst.
- hydrogenation catalysts examples include cobalt acetate / triethylaluminum, nickel acetylacetonate / triisobutylaluminum, transition metal compounds such as titanocene dichloride / n-butyllithium, zirconocene dichloride / sec-butyllithium, tetrabutoxytitanate / dimethylmagnesium / alkyl.
- Homogeneous catalyst consisting of a combination of metal compounds; heterogeneous metal catalyst such as nickel, palladium, platinum; nickel / silica, nickel / diatomaceous earth, nickel / alumina, palladium / carbon, palladium / silica, palladium / diatomaceous earth And a heterogeneous solid-supported catalyst in which a metal catalyst such as palladium / alumina is supported on a carrier.
- the norbornene-based resin preferably has a norbornene skeleton as a repeating unit. Specific examples thereof include, for example, JP-A-62-252406, JP-A-62-2252407, and JP-A-2-133413. JP, 63-145324, JP 63-264626, JP 1-2240517, JP 57-8815, JP 5-2108, JP 5-39403.
- ZEONEX manufactured by ZEON Corporation, ZEONOR (trade name), Arton (trade name) manufactured by JSR Corporation, APPEL manufactured by Mitsui Chemicals, Inc. (trade name, APL8008T, APL6509T, APL6013T, APL5014DP, APL6015T) and the like are preferably used.
- the molecular weight of the cycloolefin resin is appropriately selected according to the purpose of use, but polyisoprene or polystyrene measured by gel permeation chromatography method of cyclohexane solution (toluene solution when the polymer resin is not dissolved).
- the converted weight average molecular weight is usually in the range of 5000 to 500,000, preferably in the range of 8000 to 200,000, more preferably in the range of 10,000 to 100,000, the mechanical strength and molding processability of the molded product. Are highly balanced and suitable.
- plasticizers can be used in combination for the purpose of improving the fluidity and flexibility of the composition.
- plasticizers applicable to the present invention include phthalate ester plasticizers, fatty acid ester plasticizers, trimellitic acid ester plasticizers, phosphate ester plasticizers, polyester plasticizers, and sugar ester plasticizers. Agents, epoxy plasticizers, polyhydric alcohol ester plasticizers, and the like. It can be applied to a wide range of uses by selecting or using these plasticizers according to the use.
- the additive used in the present invention is not particularly limited, but for example, aromatic terminal ester compounds and compounds having a triazine ring are preferred.
- the aromatic terminal ester-based compound may be either an oligoester or a polyester, and the molecular weight is preferably in the range of 100 to 10,000, but is preferably in the range of 350 to 3000.
- the acid value is 1.5 mgKOH / g or less, the hydroxy group value is 25 mgKOH / g or less, more preferably the acid value is 0.5 mgKOH / g or less, and the hydroxy group value is 15 mgKOH / g or less.
- the aromatic compound having at least three aromatic rings is preferably added in the range of 0.5 to 30 parts by mass with respect to 100 parts by mass of the ⁇ / 4 retardation film.
- a range of 0 to 15 parts by mass is more preferable.
- the polyhydric alcohol ester preferably used in the present invention is composed of an ester of a dihydric or higher aliphatic polyhydric alcohol and a monocarboxylic acid, and preferably has an aromatic ring or a cycloalkyl ring in the molecule.
- the polyhydric alcohol that can be used in the present invention is represented by the following general formula (a).
- R 1 represents an n-valent organic group, and n represents a positive integer of 2 or more.
- the OH group represents an alcoholic or phenolic hydroxy group (hydroxyl group).
- Examples of preferable polyhydric alcohols include the following.
- triethylene glycol triethylene glycol
- tetraethylene glycol dipropylene glycol
- tripropylene glycol tripropylene glycol
- sorbitol trimethylolpropane
- xylitol trimethylolpropane
- monocarboxylic acid used for polyhydric alcohol ester there is no restriction
- ⁇ / 4 retardation film it is preferable to use an alicyclic monocarboxylic acid or an aromatic monocarboxylic acid in terms of improving moisture permeability and retention.
- preferred monocarboxylic acids include the following, but the present invention is not limited thereto.
- aliphatic monocarboxylic acid a fatty acid having a straight chain or a side chain having 1 to 32 carbon atoms can be preferably used.
- the number of carbon atoms is more preferably 1-20, and particularly preferably 1-10.
- Use of acetic acid is preferred because of increased compatibility with cellulose acylate, and it is also preferred to use a mixture of acetic acid and another monocarboxylic acid.
- Preferred aliphatic monocarboxylic acids include, for example, acetic acid, propionic acid, butyric acid, valeric acid, caproic acid, enanthic acid, caprylic acid, pelargonic acid, capric acid, 2-ethyl-hexanecarboxylic acid, undecylic acid, lauric acid, Tridecyl acid, myristic acid, pentadecylic acid, palmitic acid, heptadecylic acid, stearic acid, nonadecanoic acid, arachidic acid, behenic acid, lignoceric acid, serotic acid, heptacosanoic acid, montanic acid, mellicic acid, laccellic acid, undecylen
- unsaturated fatty acids such as acid, oleic acid, sorbic acid, linoleic acid, linolenic acid, and arachidonic acid.
- Examples of preferred alicyclic monocarboxylic acids include cyclopentane carboxylic acid, cyclohexane carboxylic acid, cyclooctane carboxylic acid, and derivatives thereof.
- aromatic monocarboxylic acids examples include those in which an alkyl group is introduced into the benzene ring of benzoic acid such as benzoic acid and toluic acid, and two or more benzene rings such as biphenyl carboxylic acid, naphthalene carboxylic acid, and tetralin carboxylic acid.
- benzoic acid which has, or derivatives thereof can be mentioned.
- benzoic acid is preferred.
- the molecular weight of the polyhydric alcohol ester is not particularly limited, but is preferably in the range of 300 to 1500, more preferably in the range of 350 to 750.
- a higher molecular weight is preferable because it is less likely to evaporate, and a lower one is preferable in terms of moisture permeability and compatibility with cellulose acetate.
- the carboxylic acid used for the polyhydric alcohol ester may be one kind or a mixture of two or more kinds. Moreover, all the OH groups in the polyhydric alcohol may be esterified, or a part of the OH groups may be left as they are.
- the compound having a triazine ring preferable in the present invention is preferably a discotic compound from the viewpoint of expressing the retardation of the ⁇ / 4 retardation film and reducing water content.
- the molecular weight is preferably in the range of 300 to 2,000.
- the boiling point of the discotic compound is preferably 260 ° C. or higher. The boiling point can be measured using a commercially available measuring device (for example, TG / DTA100, manufactured by Seiko Electronics Industry Co., Ltd.).
- the ⁇ / 4 retardation film according to the present invention or the protective film described later preferably contains an ultraviolet absorber.
- the ultraviolet absorber used include benzotriazole ultraviolet absorbers and 2-hydroxybenzophenone ultraviolet rays. Examples thereof include an absorbent or a salicylic acid phenyl ester ultraviolet absorber.
- 2- (5-methyl-2-hydroxyphenyl) benzotriazole 2- [2-hydroxy-3,5-bis ( ⁇ , ⁇ -dimethylbenzyl) phenyl] -2H-benzotriazole
- 2- (3 Triazoles such as 5-di-t-butyl-2-hydroxyphenyl) benzotriazole, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-octoxybenzophenone, 2,2'-dihydroxy-4-methoxybenzophenone And benzophenones.
- UV absorbers having a molecular weight of 400 or more are difficult to volatilize at a high boiling point and are difficult to disperse even during high temperature molding, so that the desired weather resistance can be effectively achieved with a relatively small amount of addition. Obtainable.
- Examples of the ultraviolet absorber having a molecular weight of 400 or more include 2- [2-hydroxy-3,5-bis ( ⁇ , ⁇ -dimethylbenzyl) phenyl] -2-benzotriazole, 2,2-methylenebis [4- ( Benzotriazoles such as 1,1,3,3-tetrabutyl) -6- (2H-benzotriazol-2-yl) phenol], bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate, Hindered amines such as bis (1,2,2,6,6-pentamethyl-4-piperidyl) sebacate and further 2- (3,5-di-t-butyl-4-hydroxybenzyl) -2-n-butyl Bis (1,2,2,6,6-pentamethyl-4-piperidyl) malonate, 1- [2- [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionyloxy Cis] ethyl] -4- [3- (3
- 2- [2-hydroxy-3,5-bis ( ⁇ , ⁇ -dimethylbenzyl) phenyl] -2-benzotriazole and 2,2-methylenebis [4- (1,1,3,3- Tetrabutyl) -6- (2H-benzotriazol-2-yl) phenol] is particularly preferred.
- TINUVIN such as TINUVIN 109, TINUVIN 171, TINUVIN 234, TINUVIN 326, TINUVIN 327, TINUVIN 328, and TINUVIN 928 (trade name) manufactured by BASF Japan Ltd. are preferable.
- TINUVIN such as TINUVIN 109, TINUVIN 171, TINUVIN 234, TINUVIN 326, TINUVIN 327, TINUVIN 328, and TINUVIN 928 (trade name) manufactured by BASF Japan Ltd. are preferable.
- BASF Japan Ltd. TINUVIN 928
- antioxidants can be added to the ⁇ / 4 retardation film in order to improve the thermal decomposability and thermal colorability during molding. It is also possible to add an antistatic agent to impart antistatic performance to the ⁇ / 4 retardation film.
- a flame retardant acrylic resin composition containing a phosphorus flame retardant may be used.
- Phosphorus flame retardants used here include red phosphorus, triaryl phosphate ester, diaryl phosphate ester, monoaryl phosphate ester, aryl phosphonate compound, aryl phosphine oxide compound, condensed aryl phosphate ester, halogenated alkyl phosphorus. Examples thereof include one or a mixture of two or more selected from acid esters, halogen-containing condensed phosphates, halogen-containing condensed phosphonates, halogen-containing phosphites, and the like.
- triphenyl phosphate 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, phenylphosphonic acid, tris ( ⁇ -chloroethyl) phosphate, tris (dichloropropyl) Examples thereof include phosphate and tris (tribromoneopentyl) phosphate.
- the ⁇ / 4 retardation film according to the present invention has, for example, silicon dioxide, titanium dioxide, aluminum oxide, zirconium oxide, calcium carbonate, kaolin, talc, calcined calcium silicate, hydration to improve handling. It is preferable to include a matting agent such as inorganic fine particles such as calcium silicate, aluminum silicate, magnesium silicate, and calcium phosphate, and a crosslinked polymer. Among these, silicon dioxide is preferably used because it can reduce the haze of the film.
- the primary average particle diameter of the fine particles is preferably 20 nm or less, more preferably in the range of 5 to 16 nm, and particularly preferably in the range of 5 to 12 nm.
- the ⁇ / 4 retardation film according to the present invention is required to withstand use in a higher temperature environment, and the tension softening point of the ⁇ / 4 retardation film is in the range of 105 to 145 ° C. It is preferable for exhibiting sufficient heat resistance, and a range of 110 to 130 ° C. is particularly preferable.
- a sample film is cut out at 120 mm (length) ⁇ 10 mm (width) and pulled with a tension of 10 N.
- the temperature can be continuously increased at a temperature increase rate of 30 ° C./min, and the temperature at 9 N can be measured three times, and the average value can be obtained.
- the glass transition temperature referred to here is an intermediate value determined according to JIS K7121 (1987) using a differential scanning calorimeter (DSC-7 model manufactured by Perkin Elmer) at a heating rate of 20 ° C./min. Point glass transition temperature (Tmg).
- the dimensional change rate (%) of the ⁇ / 4 retardation film is preferably less than 0.5%, and more preferably less than 0.3%.
- the ⁇ / 4 retardation film according to the present invention preferably has few defects in the film, and the defect here refers to that in the film generated due to rapid evaporation of the solvent in the drying step of solution casting. It refers to foreign matter (foreign matter defect) in the film due to voids (foaming defects), foreign matters in the film-forming stock solution, and foreign matters mixed into the film.
- the number of defects having a diameter of 5 ⁇ m or more in the film plane is 1/10 cm square or less. More preferably, it is in the range of 0.5 piece / 10 cm square or less, particularly preferably 0.1 piece / 10 cm square or less.
- the diameter of the above defect indicates the diameter when the defect is circular, and when the defect is not circular, the range of the defect is determined by observing with a microscope according to the following method, and the maximum diameter (diameter of circumscribed circle) is determined.
- the range of the defect is the size of the shadow when the defect is observed with the transmitted light of the differential interference microscope when the defect is a bubble or a foreign object. If the defect is a change in surface shape, such as transfer of a roller flaw or an abrasion, the size of the defect is confirmed by observing the defect with reflected light from a differential interference microscope.
- the film When the number of defects is more than 1/10 cm square, for example, when a tension is applied to the film during processing in a later process, the film may be broken with the defect as a starting point and productivity may be reduced. Moreover, when the diameter of a defect becomes 5 micrometers or more, it can confirm visually by polarizing plate observation etc., and when used as an optical member, a bright spot may arise.
- the ⁇ / 4 retardation film according to the present invention preferably has a breaking elongation in at least one direction of 10% or more, more preferably 20% or more in the measurement based on JIS-K7127-1999. is there.
- the upper limit of the elongation at break is not particularly limited, but is practically about 250%. In order to increase the elongation at break, it is effective to suppress defects in the film caused by foreign matter and foaming.
- the ⁇ / 4 retardation film according to the present invention preferably has a total light transmittance of 90% or more, more preferably 93% or more. Moreover, as a realistic upper limit, it is about 99%. In order to achieve excellent transparency expressed by such total light transmittance, it is necessary not to introduce additives and copolymerization components that absorb visible light, or to remove foreign substances in the polymer by high-precision filtration. It is effective to reduce the diffusion and absorption of light inside the film. Also, reduce the surface roughness of the film surface by reducing the surface roughness of the film contact area (cooling roller, calender roller, drum, belt, coating substrate in solution casting, transport roller, etc.) during film formation. Therefore, it is effective to reduce the diffusion and reflection of light on the film surface.
- a production method such as an inflation method, a T-die method, a calendar method, a cutting method, a casting method, an emulsion method, or a hot press method can be used. .
- the solution casting method or the melt casting method may be used as a method for forming the ⁇ / 4 retardation film according to the present invention.
- the solution casting method is preferable from the viewpoint of suppressing coloring of the film, suppressing defects of foreign matters, and suppressing optical defects such as die lines. Further, from the viewpoint of suppressing the residual of the solvent used for dissolving the resin, a method of producing by melt casting is also preferable. Methods formed by melt casting can be classified into melt extrusion molding methods, press molding methods, inflation methods, injection molding methods, blow molding methods, stretch molding methods, and the like. Among these, the melt extrusion method is preferable from the viewpoint of obtaining a film having excellent mechanical strength and surface accuracy.
- the ⁇ / 4 retardation film according to the present invention can be produced by a solution casting method.
- a resin and additives are dissolved in an organic solvent to prepare a dope, a dope is cast on a belt-shaped or drum-shaped metal support, and the cast dope is dried as a web. It is performed by a step, a step of peeling from the metal support, a step of stretching or maintaining the width, a step of further drying, and a step of winding up the finished film.
- an organic solvent useful for forming a dope is one that simultaneously dissolves a polycarbonate-based resin, cellulose acylate, and other additives. If there is, it can be used without limitation.
- methylene chloride as a non-chlorinated organic solvent, methyl acetate, ethyl acetate, amyl acetate, acetone, tetrahydrofuran, 1,3-dioxolane, 1,4-dioxane, cyclohexanone, ethyl formate, 2,2,2-trifluoroethanol, 2,2,3,3-hexafluoro-1-propanol, 1,3-difluoro-2-propanol, 1,1,1,3,3,3-hexafluoro- 2-methyl-2-propanol, 1,1,1,3,3,3-hexafluoro-2-propanol, 2,2,3,3,3-pentafluoro-1-propanol, nitroethane, etc.
- Methylene chloride, methyl acetate, ethyl acetate and acetone can be preferably used.
- the dope preferably contains a linear or branched aliphatic alcohol having 1 to 4 carbon atoms in the range of 1 to 40% by mass in addition to the organic solvent.
- a linear or branched aliphatic alcohol having 1 to 4 carbon atoms in the range of 1 to 40% by mass in addition to the organic solvent.
- An example is a dope composition dissolved in a mass% range.
- linear or branched aliphatic alcohol having 1 to 4 carbon atoms examples include methanol, ethanol, n-propanol, iso-propanol, n-butanol, sec-butanol, and tert-butanol. it can. Of these, ethanol is preferred because it improves the stability of the dope, has a relatively low boiling point, and has good drying properties.
- the concentration of cellulose acylate in the dope is preferably higher because the drying load after casting on a metal support can be reduced. However, if the concentration of cellulose acetate is too high, the load during filtration increases and filtration is performed. The accuracy becomes worse.
- the concentration for achieving both of these is preferably in the range of 10 to 35% by mass, and more preferably in the range of 15 to 25% by mass.
- the metal support in the casting (casting) step preferably has a mirror-finished surface, and a stainless steel belt or a drum whose surface is plated with a casting is preferably used as the metal support.
- the cast width can be 1 ⁇ 4m.
- the surface temperature of the metal support in the casting step is set to ⁇ 50 ° C. to a temperature at which the organic solvent boils and does not foam. A higher temperature is preferable because the web can be dried faster, but if it is too high, the web may foam and flatness may deteriorate.
- the preferable temperature of the metal support is appropriately determined in the range of 0 to 100 ° C, and more preferably in the range of 5 to 30 ° C.
- the method for controlling the temperature of the metal support is not particularly limited, and there are a method of blowing warm air or cold air, and a method of bringing hot water into contact with the back side of the metal support. It is preferable to use warm water because heat transfer is performed efficiently, so that the time until the temperature of the metal support becomes constant is short.
- the amount of residual solvent when peeling the web from the metal support is preferably in the range of 10 to 150% by mass, more preferably 20%. It is in the range of ⁇ 40 mass% or 60 to 130 mass%, particularly preferably in the range of 20 to 30 mass% or 70 to 120 mass%.
- the residual solvent amount in the present invention is defined by the following formula.
- Residual solvent amount (% by mass) ⁇ (MN) / N ⁇ ⁇ 100
- M is the mass of the sample when the web or film is collected at any time during or after production.
- N is the mass after heating M at 115 ° C. for 1 hour.
- the web is peeled off from the metal support, and further dried, so that the residual solvent amount is preferably 1% by mass or less, more preferably 0.1% by mass or less. Particularly preferably, it is in the range of 0 to 0.01% by mass.
- a roller drying method (a method in which webs are alternately passed through a plurality of rollers arranged above and below) and a method in which the web is dried while being conveyed by a tenter method are employed.
- the ⁇ / 4 retardation film according to the present invention preferably has an in-plane retardation Ro (550) measured at a wavelength of 550 nm in the range of 100 to 180 nm.
- the retardation Ro (550) is preferably imparted by film stretching.
- the stretching method For example, a method in which a circumferential speed difference is applied to a plurality of rollers, and the roller is stretched in the longitudinal direction using the circumferential speed difference between the rollers. Both ends of the web are fixed with clips and pins, and the interval between the clips and pins is widened in the traveling direction. And a method of stretching in the vertical direction, a method of stretching in the horizontal direction and stretching in the horizontal direction, a method of stretching in the vertical and horizontal directions and stretching in both the vertical and horizontal directions, and the like. Of course, you may use combining these methods suitably. That is, the film may be stretched in the transverse direction, longitudinally, or in both directions with respect to the film forming direction.
- the circumferential speed difference of the film transport roller is used in the transport direction, or both ends of the web are clipped in the direction perpendicular to the transport direction (also referred to as the width direction or the TD direction).
- a tenter system that grips the web with a right and left gripping means, and it is also preferable to use a tenter that can independently control the web gripping length (distance from the start of gripping to the end of gripping) with the left and right gripping means.
- the ⁇ / 4 retardation film according to the present invention is stretched in the stretching process in a 45 ° direction with respect to the film transport direction.
- a roll-shaped polarizing film having a transmission axis in a direction parallel to the longitudinal direction and a ⁇ / 4 retardation film having an orientation angle of substantially 45 ° are combined in the longitudinal direction to roll-to-roll.
- a roll-shaped and long circularly polarizing plate can be easily produced, which is advantageous in production with less film cut loss.
- an obliquely stretched tenter in order to impart an oblique orientation to a long film raw material to be stretched.
- the oblique stretch tenter can change the orientation angle of the film by changing the rail pattern in various ways, and can further orient the orientation axis of the film across the film width direction evenly with high precision,
- it is a film stretching method that can control the film thickness and retardation with high accuracy.
- FIGS. 3A and 3B are schematic views of a tenter that can be stretched obliquely and can be used in the production of a ⁇ / 4 retardation film according to the present invention.
- this is an example, and the present invention is not limited to this.
- the raw film 4 whose direction is controlled by the guide roller 12-1 on the tenter inlet side has an outer film holding start point 8-1 and an inner film holding point. It is carried by a gripping tool (also referred to as a clip gripping portion) at the position of the starting point 8-2, and is indicated by the locus 7-1 of the outer film holding means and the locus 7-2 of the inner film holding means by the oblique stretching tenter 6.
- a gripping tool also referred to as a clip gripping portion
- the film is conveyed and stretched in an oblique direction, the grip is released by the outer film holding end point 9-1 and the inner film holding end point 9-2, and the conveyance is controlled by the guide roller 12-2 on the tenter outlet side, and the diagonal stretching is performed.
- a film 5 is formed.
- the long film original is obliquely stretched at an angle (feeding angle ⁇ i) in the film stretching direction 14-2 with respect to the film feeding direction 14-1.
- FIG. 3B shows another tenter structure 2 that can be obliquely stretched, and stretching can be performed in the same manner as the tenter structure 1 capable of oblique stretching shown in FIG. 3A.
- the stretching in the production process of the ⁇ / 4 retardation film according to the present invention is performed using the tenter capable of oblique stretching.
- This tenter is an apparatus that widens a long film original fabric in an oblique direction with respect to its traveling direction (moving direction of the middle point in the film width direction) in an environment heated by an oven.
- the tenter includes an oven, a pair of rails on the left and right on which a gripping tool for transporting the film travels, and a number of gripping tools that travel on the rails.
- Both ends of the film fed out from the film roll and sequentially supplied to the entrance portion of the tenter are gripped by a gripping tool, the film is guided into the oven, and the film is released from the gripping tool at the exit portion of the tenter.
- the film released from the gripping tool is wound around the core.
- Each of the pair of rails has an endless continuous track, and the gripping tool which has released the grip of the film at the exit portion of the tenter travels outside and is sequentially returned to the entrance portion.
- the rail shape of the tenter is asymmetrical on the left and right, depending on the orientation angle ⁇ , the draw ratio, etc. given to the long stretched film to be manufactured. It can be fine-tuned automatically.
- a long ⁇ / 4 retardation film is stretched, and the orientation angle ⁇ can be set to an arbitrary angle within the range of 10 ° to 80 ° with respect to the winding direction after stretching. It has become.
- the traveling speed of the gripping tool can be selected as appropriate, but is usually in the range of 1 to 100 m / min.
- the difference in travel speed between the pair of left and right grippers is usually 1% or less, preferably 0.5% or less, more preferably 0.1% or less of the travel speed. This is because if there is a difference in the traveling speed between the left and right sides of the film at the exit of the stretching process, wrinkles and shifts will occur at the exit of the stretching process, so the speed difference between the right and left gripping tools is required to be substantially the same speed. Because. In general tenter devices, etc., there are speed irregularities that occur in the order of seconds or less depending on the period of the sprocket teeth driving the chain, the frequency of the drive motor, etc. It does not fall under the difference.
- the positions of the rail portions and the rail connecting portions can be freely set. Therefore, the oblique stretching tenter can be set to a stretching ratio according to an arbitrary entrance width and exit width. (In the figure, the part indicated by “ ⁇ ” is a connecting part).
- the rail that regulates the locus of the gripping tool often requires a large bending rate.
- the traveling direction 14-1 at the tenter entrance of the long film original is different from the traveling direction 14-2 at the tenter exit side of the stretched film.
- the feeding angle ⁇ i is an angle formed by the traveling direction 14-1 at the tenter entrance and the traveling direction 14-2 on the tenter exit side of the stretched film.
- the traveling direction 14-1 at the tenter entrance of the long film is changed to a direction different from the traveling direction at the entrance of the tenter at the feeding angle ⁇ i. Is done. Thereafter, the transport direction is further changed, and finally the locus is taken so as to coincide with the traveling direction of the stretched film on the tenter exit side.
- the feeding angle ⁇ i is 10 ° ⁇ i ⁇ 60 °, preferably 15 ° ⁇ i ⁇ 50 °. Set by. By setting the feeding angle ⁇ i in the above range, the variation in the optical characteristics in the width direction of the obtained film becomes good (smaller).
- the gripping tool of the tenter is configured to travel at a constant speed with a certain distance from the front and rear gripping tools.
- 4A and 4B are schematic diagrams showing the stretching direction in the oblique stretching tenter shown in FIGS. 3A and 3B described above.
- the both ends of the transport film are gripped for the first time by the gripping tool, that is, from the grip start points A1 and A1 and pulled substantially perpendicular to the center line of the transport film on the introduction side.
- the gripping tool that is, from the grip start points A1 and A1 and pulled substantially perpendicular to the center line of the transport film on the introduction side.
- the straight line crosses the trajectory of the gripping means on the opposite side and starts at two points B1 (that is, the film grip start point on the opposite side) and the gripping tools at both ends are conveyed at a substantially constant speed
- the stretching end point An moves from A1 to A2 and A3, and B1 similarly travels from B1 to B2 and B3 to the stretching end point Bn.
- the gripping portion An is gradually delayed with respect to Bn, so that the stretching direction is gradually inclined from the width direction.
- the actual grip end point (the point at which the gripped transport film is released from the gripper that was gripped) is the point at which either or both ends of the transport film are released from the gripper, that is, the grip end A point Bx and a straight line drawn substantially perpendicularly to the center line of the transport film sent from Bx to the next process are defined by two points Ay that intersect with the trajectory of the gripping means on the opposite side.
- substantially vertical means within 90 ⁇ 1 °.
- the final angle of the film stretching direction is determined by the distance W between the grip end points (the distance between Bx and Ay) and the ratio of Ax and Ay.
- LA is the travel distance from the grip start point to the grip end point on the tenter rail on the large turn side
- LB is the grip end from the grip start point on the small turn side tenter rail locus. Is the distance traveled to the point, and
- Wo represents the linear distance from grip start point A1 to B1 where the transport film is gripped for the first time by the gripping tool in the oblique stretching tenter, and both gripping tools are all stretching zones in the oblique stretching tenter.
- the draw ratio R at this time is preferably in the range of 1.3 to 3.0, and more preferably in the range of 1.5 to 2.5. If the draw ratio is in this range, thickness unevenness in the width direction is reduced, which is preferable. In the stretching zone of the oblique stretching tenter, if the stretching temperature is made different in the width direction, the thickness unevenness in the width direction can be further improved.
- the long film original is sequentially held at both ends (both sides) by the right and left gripping tools at the tenter entrance (position a). Traveled as the gripping tool travels.
- the left and right gripping tools facing the direction substantially perpendicular to the film traveling direction (14-1) run on a rail that is asymmetrical in the left-right direction, preheating zone, and lateral stretching. It passes through an oven having a zone, an oblique stretching zone, a holding zone, and a cooling zone.
- Preheating zone / oblique stretching zone / holding zone / cooling zone 2 Preheating zone / lateral stretching zone / oblique stretching zone / holding zone / cooling zone 3) Preheating zone / oblique stretching zone / lateral stretching zone / holding zone / cooling zone 4) Preheating zone / transverse stretching zone 1 / oblique stretching zone / transverse stretching zone 2 / holding zone / cooling zone 5) Preheating zone / transverse stretching zone 1 / oblique stretching zone 1 / transverse stretching zone 2 / oblique stretching zone 2 / holding Zone / Cooling Zone
- the preheating zone refers to a section where the distance between the gripping tools gripping both ends of the film is kept constant at the oven entrance.
- the transverse stretching zone refers to a section where the gap between the gripping tools that grip both ends of the film starts to reach a predetermined interval.
- the opening angle of the rail on which the gripping tools at both ends run may be opened at the same angle for both rails, or may be opened at different angles.
- the diagonally stretched zone refers to a gripping tool that grips both ends of the film, while the gripping tool spacing is kept constant or spreads, and then both gripping tools travel on the straight rail again after starting to run on the bending rail. Refers to the section until the beginning.
- the holding zone refers to a section in which the gripping tools at both ends travel while being parallel to each other during a period in which the interval between the gripping tools after the transverse stretching zone or the oblique stretching zone becomes constant again.
- the cooling zone refers to a section where the temperature in the zone is set to the glass transition temperature Tg ° C. or lower of the thermoplastic resin constituting the film in the section after the holding zone.
- a rail pattern that narrows the gap between the opposing grippers in advance may be used.
- the temperature of each zone is in the range of Tg to Tg + 30 ° C in the preheating zone, Tg to Tg + 30 ° C in the stretching zone, and Tg-30 to Tg ° C in the cooling zone with respect to the glass transition temperature Tg of the thermoplastic resin. It is preferable to set to.
- a temperature difference in the width direction may be applied in the stretching zone.
- a method of imparting a temperature difference in the width direction in the stretching zone include, for example, a method of adjusting the opening degree of the nozzle that sends warm air into the temperature-controlled room so as to make a difference in the width direction, and heating by arranging heaters in the width direction.
- a known method such as control can be used.
- the film is maintained while supporting the film at the time of stretching, stretched in the state where the volatile content is 5% by volume or more, and then volatilized while shrinking.
- the method etc. which reduce a fraction can be mentioned.
- Maintaining the supportability of the film as used in the present invention means holding both side edges without impairing the film properties of the film.
- the state of 5% by volume or more may always be maintained in the stretching operation process, and the state of the volatile content is maintained at 5% by volume or more only in a part of the stretching operation process. May be.
- the inlet position is a starting point and that the section of 50% or more of the entire stretching section and the volatile content rate are 12% by volume or more.
- the volatile content is 12% by volume or more before stretching.
- the volatile fraction (unit: volume%) represents the volume of the volatile component contained per unit volume of the film, and is a value obtained by dividing the volatile component volume by the film volume.
- the guide roller closest to the entrance of the tenter is a driven roller that guides the running of the film, and is rotatably supported via bearings.
- a driven roller that guides the running of the film, and is rotatably supported via bearings.
- known materials can be used, but those having a method for reducing the weight, such as a method of applying a ceramic coat to prevent the film from being damaged, a method of applying chrome plating to a light metal such as aluminum, etc. Is preferred.
- This roller is provided to stabilize the track when the film travels.
- one of the rollers on the upstream side of the roller nips the film to be conveyed by pressing the rubber roller.
- a pair of bearing portions at both ends (left and right) of the guide roller closest to the entrance of the tenter are provided with a first tension detecting device and a second film tension detecting device for detecting the tension generated in the film in the roller.
- a first tension detecting device for example, a load cell can be used.
- a load cell a known tensile or compression type can be used.
- a load cell is a device that detects a load acting on an applied point by converting it into an electrical signal using a strain gauge attached to the strain generating body.
- the load film exerts the force exerted on the roller, that is, the tension in the film traveling direction that is generated near both side edges of the film. It is detected independently on the left and right.
- a method may be used in which a strain gauge is directly attached to a support constituting the roller bearing portion, and a load, that is, a film tension is detected based on the strain generated in the support. The relationship between the generated strain and the film tension is measured in advance and is known.
- the film tension detection device as described above is provided so that the tension in the vicinity of both side edges of the film in the guide roller closest to the entrance of the oblique stretching tenter is detected because the position and direction of the film is the same as that of the film stretching device.
- the position and direction of the entrance depending on the amount of deviation, there will be a difference in the tension near the side edges of the film in the guide roller closest to the entrance of the obliquely stretched tenter. This is because the degree of deviation is determined by detecting this tension difference.
- the load acting on the rollers will be approximately equal on the left and right, and if the positions are shifted, the left and right films There is a difference in tension.
- the guide roller closest to the entrance of the oblique stretching tenter is gripped by the gripping tool at the entrance of the film stretching apparatus by appropriately adjusting the position and angle of the film so that the difference in film tension between the left and right sides is equal. Is stable, and it is possible to prevent the occurrence of troubles such as removal of the gripping tool. Furthermore, the physical property in the width direction can be stabilized in the film after oblique stretching by the film stretching apparatus.
- a method for changing the film transport direction is required.
- a device for changing the film conveyance direction a known method such as an air flow roller can be used. It is preferable that a device (winding device, accumulator device, drive device, etc.) after the obliquely extending tenter exit is slidable in the lateral direction.
- FIG. 5A to FIG. 5C are schematic views showing an example in which the film is drawn from a long film original roll and then obliquely stretched as an example of the manufacturing method according to the embodiment of the present invention.
- FIG. 6A and FIG. 6B are schematic diagrams illustrating an example of continuous oblique stretching without winding up a long film original as another example of the manufacturing method according to the embodiment of the present invention.
- FIGS. 5A to 5C show an example of a manufacturing method in which each of the long film originals once wound into a roll is drawn out and obliquely stretched.
- FIGS. 6A and 6B each of the long film originals is shown.
- An example of the manufacturing method which performs a diagonal stretch process continuously, without winding up is shown.
- 16 is a film feeding device
- 17 is a conveying direction changing device
- 18 is a winding device
- 19 is a film forming device
- 12-1 is a guide roller on the tenter inlet side
- 12-2 is a tenter outlet side. Each guide roller is shown.
- the film feeding device 16 is slidable and turnable so that the film can be fed at a predetermined angle with respect to the entrance of the oblique stretching tenter, or the film feeding device 16 is slidable. It is preferable that the film can be sent out to the entrance of the obliquely stretched tenter.
- the film feeding device 16 and the conveyance direction changing device 17 By configuring the film feeding device 16 and the conveyance direction changing device 17 in such a configuration, the width of the entire manufacturing apparatus can be further reduced, and the film feeding position and angle can be finely controlled. This makes it possible to obtain a stretched film having small variations in film thickness and optical value.
- the film feeding device 16 and the conveyance direction changing device 17 it is possible to effectively prevent the left and right clips from being caught in the film.
- the take-up tension T (N / m) of the stretched film needs to be adjusted between 100 N / m ⁇ T ⁇ 300 N / m, preferably 150 N / m ⁇ T ⁇ 250 N / m.
- the take-up tension T of the film after stretching exceeds 100 N / m, the occurrence of sagging and wrinkles of the film can be suppressed, and the retardation and the profile in the width direction of the orientation axis can be controlled to appropriate conditions. Moreover, if the take-up tension T of the film after stretching is less than 300 N / m, the variation in the orientation angle in the width direction can be suppressed, and a good width yield (taking efficiency in the width direction) can be obtained. .
- the fluctuation of the take-up tension T it is preferable to control the fluctuation of the take-up tension T with an accuracy of less than ⁇ 5%, preferably less than ⁇ 3%. If the fluctuation of the take-up tension T is less than ⁇ 5%, it is preferable because variations in optical characteristics in the width direction and the flow direction can be suppressed.
- general PID control is performed so that the load applied to the first roller at the tenter outlet, that is, the film tension is measured and the value is kept constant. It is preferable to apply a method of controlling the rotation speed of the take-up roller by a method (P (proportional control), I (integral control), D (differential control)).
- Examples of the method for measuring the load include a method in which a load cell is attached to a bearing portion of a roller and a load applied to the roller, that is, a film tension is measured.
- a load cell a known tensile type or compression type can be used.
- the stretched film is released from the tenter outlet after being gripped by the gripping tool, and after being gripped at both ends (both sides) of the film, the film is wound around a winding roller in order to be a roll-shaped stretched film. It can be made into a laminated body.
- a masking film may be overlapped and wound up at the same time, or at least one of the stretched film, preferably tape or the like at both ends. You may wind up while bonding.
- the masking film is not particularly limited as long as it can protect the film, and examples thereof include a polyethylene terephthalate film, a polyethylene film, and a polypropylene film.
- the stretched film obtained by the production method described above has an in-plane litter in the width direction at an orientation angle ⁇ inclined in the range of, for example, 10 ° to 80 ° with respect to the winding direction, and at least 1300 mm wide. It is preferable that the variation in the foundation Ro is 4 nm or less and the variation in the orientation angle ⁇ is 1.0 ° or less.
- the variation of the in-plane retardation Ro of the stretched film is 4 nm or less, preferably 3 nm or less, in at least 1300 mm in the width direction.
- the variation in the orientation angle ⁇ of the stretched film is 1.0 ° or less, preferably 0.80 ° or less, in at least 1300 mm in the width direction.
- a circularly polarizing plate is produced by laminating a stretched film having a variation in the orientation angle ⁇ of 1.0 ° or less with a polarizer, and this is installed in an organic electroluminescence display device, it has excellent light leakage resistance and good contrast. Obtainable.
- the optimum value of the in-plane retardation Ro of the stretched film is selected depending on the design of the display device used.
- the average thickness of the stretched film is preferably 20 to 80 ⁇ m, more preferably 30 to 60 ⁇ m, and particularly preferably 30 to 40 ⁇ m from the viewpoint of mechanical strength and the like.
- the thickness unevenness in the width direction affects whether or not winding is possible, and is preferably 3 ⁇ m or less, and more preferably 2 ⁇ m or less.
- the ⁇ / 4 retardation film according to the present invention can also be formed by a melt film forming method.
- the melt film forming method means that a composition containing an additive such as a resin and a plasticizer is heated and melted to a temperature showing fluidity, and then a melt containing fluid cellulose acetate is cast.
- the molding method for heating and melting can be further classified into a melt extrusion molding method, a press molding method, an inflation method, an injection molding method, a blow molding method, a stretch molding method, and the like.
- the melt extrusion method is preferable from the viewpoint of mechanical strength and surface accuracy. It is preferable that a plurality of raw materials used for melt extrusion are usually kneaded in advance and pelletized.
- Pelletization may be performed by a known method. For example, dry cellulose resin, plasticizer, and other additives are supplied to an extruder using a feeder, kneaded using a single or twin screw extruder, and then from a die to a strand. Extruded into a shape, water-cooled or air-cooled and cut.
- Additives may be mixed before being supplied to the extruder, or may be supplied by individual feeders.
- a small amount of additives such as particles and antioxidants are preferably mixed in advance in order to mix uniformly.
- the extruder is preferably processed at as low a temperature as possible so that it can be pelletized so as to suppress the shearing force and prevent the resin from deteriorating (molecular weight reduction, coloring, gel formation, etc.).
- a twin screw extruder it is preferable to rotate in the same direction using a deep groove type screw. From the uniformity of kneading, the meshing type is preferable.
- Film formation is performed using the pellets obtained as described above.
- the raw material powder can be directly fed to the extruder by a feeder without being pelletized to form a film as it is.
- the melting temperature is set to about 200 to 300 ° C., filtered through a leaf disk type filter or the like to remove foreign matters, and then formed into a film from a T die.
- the film is nipped between the cooling roller and the elastic touch roller, and solidified on the cooling roller.
- the extrusion flow rate is preferably carried out stably by introducing a gear pump.
- a stainless fiber sintered filter is preferably used as a filter used for removing foreign substances.
- Stainless steel fiber sintered filter is a product that compresses the stainless steel fiber body in a complicatedly intertwined state, and sinters and integrates the contact points. The density is changed according to the thickness of the fiber and the compression amount, Filtration accuracy can be adjusted.
- Additives such as plasticizers and particles may be mixed with the resin in advance, or may be kneaded in the middle of the extruder. In order to add uniformly, it is preferable to use a mixing apparatus such as a static mixer.
- the film temperature on the touch roller side is preferably Tg or more and Tg + 110 ° C. or less of the film.
- a known roller can be used as the roller having an elastic surface used for such a purpose.
- the elastic touch roller is also called a pinching rotator.
- a commercially available elastic touch roller can also be used.
- the film obtained by the melt casting method as described above is stretched by the stretching operation after passing through the step of contacting the cooling roller.
- the stretching method a known roller stretching machine or tenter can be preferably used.
- the stretching temperature is usually preferably in the temperature range of Tg to Tg + 60 ° C. of the resin constituting the film.
- the end Before winding, the end may be slit and trimmed to the product width, and knurled (embossed) may be applied to both ends to prevent sticking and scratching during winding.
- the knurling method can process a metal ring having an uneven pattern on its side surface by heating or pressing.
- the film is deform
- the film thickness of the ⁇ / 4 retardation film according to the present invention is not particularly limited, but is used in the range of 10 to 250 ⁇ m. Furthermore, the film thickness is preferably in the range of 10 to 100 ⁇ m, particularly preferably 30 to 60 ⁇ m.
- the ⁇ / 4 retardation film according to the present invention has a width of 1 to 4 m. Further, those having a width of 1.4 to 4 m are preferably used, and particularly preferably in the range of 1.6 to 3 m. If it exceeds 4 m, conveyance becomes difficult.
- the arithmetic average roughness Ra of the surface of the ⁇ / 4 retardation film according to the present invention is preferably 2.0 to 4.0 nm, more preferably 2.5 to 3.5 nm.
- the layer A according to the present invention is formed on at least one surface of a ⁇ / 4 retardation film and has a storage elastic modulus in the range of 100 to 500 MPa, and comprises a polarizer, a ⁇ / 4 retardation film, It is preferable to be formed between.
- the material for forming the layer A according to the present invention is not particularly limited, but is preferably an ultraviolet curable resin.
- the ultraviolet curable resin applicable to the present invention is more preferably a cationic polymerizable compound.
- the cationic polymerizable compound also referred to as a cationic polymerizable monomer
- various known cationic polymerizable monomers can be used, and among them, an epoxy compound and a compound having an oxetane ring are preferably used. Furthermore, it is preferable to contain a vinyl ether compound in addition to them.
- Examples of monofunctional epoxides used in the present invention include, for example, phenyl glycidyl ether, p-tert-butylphenyl glycidyl ether, butyl glycidyl ether, 2-ethylhexyl glycidyl ether, allyl glycidyl ether, 1,2-butylene oxide, 1 , 3-butadiene monooxide, 1,2-epoxydodecane, epichlorohydrin, 1,2-epoxydecane, styrene oxide, cyclohexene oxide, 3-methacryloyloxymethylcyclohexene oxide, 3-acryloyloxymethylcyclohexene oxide, 3- Examples include vinylcyclohexene oxide.
- polyfunctional epoxides include, for example, bisphenol A diglycidyl ether, bisphenol F diglycidyl ether, bisphenol S diglycidyl ether, brominated bisphenol A diglycidyl ether, brominated bisphenol F diglycidyl ether, brominated bisphenol S diglycidyl.
- Ether epoxy novolac resin, hydrogenated bisphenol A diglycidyl ether, hydrogenated bisphenol F diglycidyl ether, hydrogenated bisphenol S diglycidyl ether, 3,4-epoxycyclohexylmethyl-3 ', 4'-epoxycyclohexanecarboxylate, 2 -(3,4-epoxycyclohexyl-5,5-spiro-3,4-epoxy) cyclohexane-meta-dioxane, bis (3,4-epoxycyclohexyl) Methyl) adipate, vinylcyclohexene oxide, 4-vinylepoxycyclohexane, bis (3,4-epoxy-6-methylcyclohexylmethyl) adipate, 3,4-epoxy-6-methylcyclohexyl-3 ', 4'-epoxy-6 '-Methylcyclohexanecarboxylate, methylenebis (3,4-e
- any known oxetane compound as introduced in JP-A Nos. 2001-220526 and 2001-310937 can be used in combination.
- Examples of monofunctional oxetane compounds used in the present invention include, for example, 3-ethyl-3-hydroxymethyloxetane, 3- (meth) allyloxymethyl-3-ethyloxetane, (3-ethyl- 3-oxetanylmethoxy) methylbenzene, 4-fluoro- [1- (3-ethyl-3-oxetanylmethoxy) methyl] benzene, 4-methoxy- [1- (3-ethyl-3-oxetanylmethoxy) methyl] benzene, [1- (3-ethyl-3-oxetanylmethoxy) ethyl] phenyl ether, isobutoxymethyl (3-ethyl-3-oxetanylmethyl) ether, isobornyloxyethyl (3-ethyl-3-oxetanylmethyl) ether, Isobornyl (3-ethyl-3-ox
- polyfunctional oxetane compound examples include 3,7-bis (3-oxetanyl) -5-oxa-nonane, 3,3 ′-(1,3- (2-methylenyl) propanediylbis (oxymethylene).
- Vinyl ether compound Any known vinyl ether compound can be used in combination as the compound having a vinyl ether group.
- Examples of the monofunctional vinyl ether compound used in the present invention include methyl vinyl ether, ethyl vinyl ether, propyl vinyl ether, n-butyl vinyl ether, t-butyl vinyl ether, 2-ethylhexyl vinyl ether, n-nonyl vinyl ether, lauryl vinyl ether, cyclohexyl vinyl ether, cyclohexyl.
- polyfunctional vinyl ether compound examples include ethylene glycol divinyl ether, diethylene glycol divinyl ether, polyethylene glycol divinyl ether, propylene glycol divinyl ether, butylene glycol divinyl ether, hexanediol divinyl ether, bisphenol A alkylene oxide divinyl ether, and bisphenol F alkylene.
- Divinyl ethers such as oxide divinyl ether; trimethylolethane trivinyl ether, trimethylolpropane trivinyl ether, ditrimethylolpropane tetravinyl ether, glycerin trivinyl ether, pentaerythritol tetravinyl ether, dipentaerythritol pentavinyl ether, dipentaerythritol Hexavinyl ether, ethylene oxide-added trimethylolpropane trivinyl ether, propylene oxide-added trimethylolpropane trivinyl ether, ethylene oxide-added ditrimethylolpropane tetravinyl ether, propylene oxide-added ditrimethylolpropane tetravinyl ether, ethylene oxide-added pentaerythritol tetravinyl ether, propylene Examples thereof include polyfunctional vinyl ether
- a photopolymerization initiator is used together with the cationic polymerizable compound.
- the photopolymerization initiator any known photopolymerization initiators published in “Application and Market of UV / EB Curing Technology” (CMC Publishing Co., Ltd., edited by Yoneho Tabata / edited by Radtech Research Association) may be used. it can.
- a photoacid generator as a photopolymerization initiator.
- a photoacid generator for example, a chemically amplified photoresist or a compound used for photocationic polymerization is used (edited by Organic Electronics Materials Research Group, “Organic Materials for Imaging”, Bunshin Publishing (1993), 187. See page 192). Examples of compounds suitable for the present invention are listed below.
- B (C 6 F 5 ) 4 ⁇ , PF 6 ⁇ , AsF 6 ⁇ , SbF 6 ⁇ , and CF 3 SO 3 — salts of aromatic onium compounds such as diazonium, ammonium, iodonium, sulfonium, and phosphonium are listed. be able to.
- the onium salt is preferably a sulfonium salt or an iodonium salt.
- sulfonated products that generate sulfonic acid can be mentioned.
- a halide that generates hydrogen halide can also be used.
- an iron allene complex can be mentioned.
- the photoacid generator is preferably a compound containing a triarylsulfonium salt.
- additives can be used for the layer A according to the present invention as long as the storage elastic modulus is not affected.
- the same plasticizer as described in the explanation of the ⁇ / 4 retardation film It is preferable to use polyhydric alcohol esters, ultraviolet absorbers, discotic compounds, phosphorus flame retardants, matting agents, and the like.
- a low-boiling organic solvent such as alcohols, ketones, and polyhydric alcohols
- these low-boiling organic solvents are applied to the ⁇ / 4 retardation film after coating. Diffusion may cause the ⁇ / 4 retardation film to swell, shrink, or expand and cause the flatness of the ⁇ / 4 retardation film to deteriorate.
- a wet coating method As a coating method used to form layer A with a coating liquid for forming layer A on a ⁇ / 4 retardation film, a wet coating method is preferable.
- spin coating, dip coating, extrusion coating, roller Examples thereof include coat coating spray coating, gravure coating, wire bar coating, and air knife coating.
- the layer A formed on the ⁇ / 4 retardation film by the wet coating method as described above is then irradiated with ultraviolet rays on the coated film surface for film curing.
- the irradiation means used for ultraviolet irradiation includes an ultraviolet lamp that emits ultraviolet light of a specific wavelength region with stable exposure energy and a filter that transmits ultraviolet light of a specific wavelength.
- an ultraviolet lamp a mercury lamp, a metal halide lamp, an electrodeless lamp, an excimer laser, an ultraviolet laser, a cold cathode tube, a hot cathode tube, a black light, an LED (light emitting diode), and the like are applicable.
- the layer A according to the present invention is characterized in that the storage elastic modulus is in the range of 100 to 500 MPa, preferably in the range of 130 to 400 MPa, and more preferably in the range of 150 to 300 MPa.
- the storage elastic modulus referred to in the present invention is a value obtained by dynamic viscoelasticity measurement, specifically, a value measured according to the following storage elastic modulus measurement method.
- coating is performed on a polyethylene terephthalate film (PET) support using a layer A forming coating solution.
- PET polyethylene terephthalate film
- the formed thin film was peeled off from the PET support, and this layer A was heated using a dynamic viscoelasticity measuring device (“ARES” manufactured by Rheometric Co., Ltd.) in a heating mode (heating rate 5 ° C./min, frequency 10 Hz). )
- TOS dynamic viscoelasticity measuring device
- the kind of the cationic polymerizable compound (particularly, the selection of a monofunctional compound to a polyfunctional compound) ), Types of cationic polymerization initiators, types and amounts of additives, types of irradiation light source used for curing, irradiation intensity, and the like, and by combining these various means optimally, the desired layer A Storage modulus can be achieved.
- the compound having a large number of functional groups is selected as the cationic polymerizable compound, the additive amount is decreased, the curing conditions (irradiation intensity, irradiation time) are increased, and the storage elastic modulus of the layer A is increased. Can be set high.
- the wavelength has a maximum absorption wavelength ( ⁇ max) in the ultraviolet region in the range of 200 to 400 nm.
- the layer A By imparting such ultraviolet absorption characteristics to the layer A, it is possible to suppress the amount of ultraviolet light incident from the viewing side to reach the organic electroluminescence element and to obtain excellent light resistance (ultraviolet light resistance).
- the coating liquid for forming layer A is applied onto a polyethylene terephthalate film support.
- the formed thin film was peeled off from the PET support, and this layer A was measured for spectral transmittance at a wavelength of 200 nm to 800 nm using a spectrophotometer U-4000 type manufactured by Hitachi, Ltd., and an ultraviolet having a wavelength of 200 to 400 nm was measured. It is confirmed that the maximum value ( ⁇ max) of the absorption wavelength exists in the region.
- the ultraviolet curable resin used for the formation of the layer A more specifically, the types of the cationic polymerizable compound and the cationic polymerization initiator are used. Desired ultraviolet absorption characteristics can be obtained by adding the ultraviolet absorber as required or selected.
- the layer B according to the present invention is preferably disposed between the protective film and the polarizer, and the storage elastic modulus is preferably less than the storage elastic modulus of the layer A according to the present invention described above.
- the storage elastic modulus of the layer B is preferably about less than 500 MPa, although it is related to the storage elastic modulus of the layer A.
- the material constituting the layer B according to the present invention is not particularly limited, but for example, by appropriately selecting the same constituent material as that used for the layer A so as to obtain a desired storage elastic modulus. Can be used.
- additives can be used as long as the object effects of the present invention are not impaired.
- the same plasticizer as described in the explanation of the ⁇ / 4 retardation film It is preferable to use polyhydric alcohol esters, ultraviolet absorbers, discotic compounds, phosphorus flame retardants, matting agents, and the like.
- the layer B according to the present invention is formed using a layer B forming coating solution.
- a coating method that can be used for forming the layer B a wet coating method is preferable, for example, spin coating coating, dip coating, extrusion coating, roller coating coating spray coating, gravure coating, wire bar coating, air knife coating, etc. Can be mentioned.
- the protective film for the circularly polarizing plate is preferably provided with an antireflection function for external light by coating a surface antireflection layer (11 shown in FIG. 1) directly or via another layer.
- the surface antireflection layer is preferably laminated by appropriately designing the refractive index, film thickness, number of layers, layer order, etc. so that the reflectance is reduced by optical interference.
- the surface antireflection layer is preferably composed of a single low refractive index layer having a refractive index lower than that of the support, or a combination of a high refractive index layer having a refractive index higher than that of the support and a low refractive index layer.
- the surface antireflection layer is composed of three or more refractive index layers, and three layers having different refractive indexes from the support side are divided into medium refractive index layers (having a higher refractive index than the support and having a high refractive index.
- the layer is preferably laminated in the order of a layer having a lower refractive index than the layer) / a high refractive index layer / a low refractive index layer.
- a surface antireflection layer having a layer structure of four or more layers in which two or more high refractive index layers and two or more low refractive index layers are alternately laminated is also preferably used. Examples of the configuration of the surface antireflection layer include the following configurations, but are not limited thereto.
- a low refractive index layer is an essential constituent, and it is preferable to contain silica-based fine particles, and the refractive index is lower than the refractive index of the substrate film as a support,
- the wavelength is preferably in the range of 1.30 to 1.45 when measured at a wavelength of 550 nm.
- the film thickness of the low refractive index layer is preferably in the range of 5 to 500 nm, more preferably in the range of 10 to 300 nm, and most preferably in the range of 30 to 200 nm.
- the silica-based fine particles contain at least one kind of particles having an outer shell layer and porous or hollow inside.
- the particles having the outer shell layer and having a porous or hollow interior are hollow silica-based fine particles.
- composition for forming a low refractive index layer preferably contains an organosilicon compound represented by the following general formula (OSi-1), a hydrolyzate thereof, or a polycondensate thereof.
- OSi-1 organosilicon compound represented by the following general formula (OSi-1)
- hydrolyzate thereof a hydrolyzate thereof
- polycondensate thereof a polycondensate thereof.
- R represents an alkyl group having 1 to 4 carbon atoms.
- specific organic silicon compounds tetramethoxysilane, tetraethoxysilane, tetraisopropoxysilane and the like are preferably used.
- an organic solvent and if necessary, a silane coupling agent, a curing agent, a surfactant and the like may be added.
- the refractive index of the high refractive index layer is preferably adjusted to a refractive index in the range of 1.4 to 2.2 as measured under conditions of 23 ° C. and wavelength of 550 nm.
- the thickness of the high refractive index layer is preferably 5 nm to 1 ⁇ m, more preferably 10 to 200 nm, and most preferably 30 to 100 nm. Adjustment to a desired refractive index can be achieved by adding metal oxide fine particles and the like.
- the metal oxide fine particles to be used preferably have a refractive index in the range of 1.80 to 2.60, more preferably 1.85 to 2.50.
- the metal oxide fine particles applicable to the formation of the high refractive index layer are not particularly limited, and Ti, Zr, Sn, Sb, Cu, Fe, Mn, Pb, Cd, As, Cr, Hg, Zn , Al, Mg, Si, P and S can be used metal oxides having at least one metal element selected from the group consisting of Al, In, Sn, Sb, A small amount of atoms such as Nb, halogen element, and Ta may be doped. A mixture of these may also be used.
- At least one metal oxide fine particle selected from among zirconium oxide, antimony oxide, tin oxide, zinc oxide, indium tin oxide (ITO), antimony doped tin oxide (ATO), and zinc antimonate is used. It is preferable to use it as a main component. Among them, it is particularly preferable to contain zinc antimonate particles.
- the average particle diameter of primary particles of these metal oxide fine particles is in the range of 10 to 200 nm, and more preferably in the range of 10 to 150 nm.
- the average particle diameter of the metal oxide fine particles can be measured from an electron micrograph taken with a scanning electron microscope (SEM) or the like. Further, it may be measured by a particle size distribution meter using a dynamic light scattering method or a static light scattering method. When the average particle size is 10 nm or more, aggregation is difficult and good dispersibility can be obtained. Moreover, if an average particle diameter is 200 nm or less, the raise of a haze can be suppressed.
- the shape of the metal oxide fine particles is preferably an ellipse, a sphere, a cube, a spindle, a needle or an indefinite shape.
- the surface of the metal oxide fine particles may be treated with an organic compound.
- an organic compound By modifying the surface of the metal oxide fine particles with an organic compound, the dispersion stability in an organic solvent is improved, the dispersion particle size can be easily controlled, and aggregation and sedimentation over time can be suppressed. .
- the amount of surface modification with a preferable organic compound is in the range of 0.1 to 5% by mass, and more preferably in the range of 0.5 to 3% by mass with respect to the metal oxide particles.
- organic compounds used for the surface treatment include polyols, alkanolamines, stearic acid, silane coupling agents and titanate coupling agents. Among these, a silane coupling agent is preferable. Two or more kinds of surface treatments may be combined.
- the high refractive index layer may contain a ⁇ -conjugated conductive polymer.
- a ⁇ -conjugated conductive polymer any organic polymer whose main chain is composed of a ⁇ -conjugated system can be used. Examples thereof include polythiophenes, polypyrroles, polyanilines, polyphenylenes, polyacetylenes, polyphenylene vinylenes, polyacenes, polythiophene vinylenes, and copolymers thereof. From the viewpoint of ease of polymerization and stability, polythiophenes, polyanilines, and polyacetylenes are preferable.
- the ⁇ -conjugated conductive polymer can provide sufficient conductivity and solubility in a binder resin even if it is not substituted, but in order to further improve conductivity and solubility, an alkyl group, a carboxy group, a sulfo group, an alkoxy group.
- a functional group such as a group, a hydroxy group, or a cyano group may be introduced.
- you may contain an ionic compound.
- the ionic compound examples include imidazolium-based, pyridium-based, alicyclic amine-based, aliphatic amine-based, aliphatic phosphonium-based cations and inorganic ion-based compounds such as BF 4 ⁇ and PF 6 ⁇ , CF 3 SO 2 ⁇ , and the like. , (CF 3 SO 2 ) 2 N ⁇ , CF 3 CO 2 —, etc.
- the ratio of the polymer to the binder is preferably 10 to 400 parts by mass with respect to 100 parts by mass of the polymer, and particularly preferably 100 to 200 parts by mass with respect to 100 parts by mass of the polymer.
- the organic EL element B includes, for example, a metal electrode 102, an organic light emitting layer 103, a transparent electrode (ITO, etc.) in this order on a substrate 101 using glass, polyimide, or the like. 104, an insulating layer 105, a sealing layer 106, and a film 107 (optional).
- the organic light emitting layer 104 includes, for example, a hole injection layer, a hole transport layer, a light emitting layer, And an electron transport layer.
- the substrate 101 that can be used in the organic EL display device shown in FIGS. 1 and 2 is not particularly limited in the type of glass, plastic, and the like, and may be transparent or opaque.
- the substrate 1 is preferably transparent.
- the transparent substrate preferably used include glass, quartz, and a transparent resin film.
- polyesters such as polyethylene terephthalate (PET) and polyethylene naphthalate (PEN), polyethylene, polypropylene, cellophane, cellulose diacetate (DAC), cellulose triacetate (TAC), cellulose acetate butyrate, cellulose acetate pro Cellulose esters such as pionate (CAP), cellulose acetate phthalate, cellulose nitrate or derivatives thereof, polyvinylidene chloride, polyvinyl alcohol, polyethylene vinyl alcohol, syndiotactic polystyrene, polycarbonate, norbornene resin, polymethylpentene, polyether Ketone, polyimide, polyethersulfone (PES), polyphenylene sulfide, police Hong, polyether imide, polyether ketone imide, polyamide, fluororesin, nylon, polymethyl methacrylate, acrylic or polyarylates, Arton (trade name, manufactured by JSR) or Appel (trade name, manufactured by
- An inorganic or organic barrier film or a hybrid barrier film of both may be formed on the surface of the resin film, and the water vapor permeability (temperature: 25 ⁇ ) measured by a method according to JIS K 7129-1992. It is preferable that the barrier film is 0.5 g, (relative humidity: 90 ⁇ 2% RH) is 0.01 g / (m 2 ⁇ 24 h ⁇ atm) or less, and further, a method according to JIS K 7126-1987 High barrier with an oxygen permeability measured at 1 ⁇ 10 ⁇ 3 ml / (m 2 ⁇ 24 h ⁇ atm) or less and a water vapor permeability of 1 ⁇ 10 ⁇ 5 g / (m 2 ⁇ 24 h ⁇ atm) or less It is preferable that it is an adhesive film.
- the material for forming the barrier film may be any material that has a function of suppressing intrusion of elements that cause deterioration of elements such as moisture and oxygen.
- silicon oxide, silicon dioxide, silicon nitride, or the like can be used.
- the method for forming the barrier film is not particularly limited.
- the vacuum deposition method, sputtering method, reactive sputtering method, molecular beam epitaxy method, cluster ion beam method, ion plating method, plasma polymerization method, atmospheric pressure plasma A polymerization method, a plasma CVD method, a laser CVD method, a thermal CVD method, a coating method, or the like can be used.
- An atmospheric pressure plasma polymerization method as described in JP-A-2004-68143 is a particularly precise thin film. From the viewpoint that can be formed.
- the opaque substrate examples include a metal plate such as aluminum and stainless steel, an opaque film, an opaque resin substrate, and a ceramic substrate.
- the substrate is preferably a glass plate from the viewpoint of preventing warpage of the organic electroluminescence display device.
- the thickness of the glass plate is preferably in the range of 0.1 to 10 mm. If it is 0.1 mm or more, the durability is good, it is not cracked by a weak impact during transportation or use, and it is not warped even when heated, and the visibility is not deteriorated by cracking. Moreover, if it is 10 mm or less, an organic electroluminescent display apparatus can be designed lightly and manufacturing cost can also be held down.
- a metal electrode (also referred to as an anode) has a high work function from the vacuum level of the electrode material in order to inject holes efficiently, such as aluminum (Al), chromium (Cr), molybdenum (Mo), Tungsten (W), copper (Cu), silver (Ag), gold (Au) metals and alloys thereof, oxides of these metals and alloys, or tin oxide (SnO 2 ) and antimony (Sb) Alloy, ITO (indium tin oxide), InZnO (indium zinc oxide), alloy of zinc oxide (ZnO) and aluminum (Al), and oxides of these metals and alloys alone or mixed Used in
- the anode may have a laminated structure of a first layer excellent in light reflectivity and a second layer having a light transmittance and a large work function provided thereon.
- the first layer is made of an alloy mainly composed of aluminum.
- the subcomponent may include at least one element having a work function relatively smaller than that of aluminum as a main component.
- a lanthanoid series element is preferable.
- the work function of the lanthanoid series elements is not large, the inclusion of these elements improves the stability of the anode and also satisfies the hole injection property of the anode.
- elements such as silicon (Si) and copper (Cu) may be included as subcomponents.
- the content of subcomponents in the aluminum alloy layer constituting the first layer is preferably about 10% by mass or less in total for Nd, Ni, Ti, or the like that stabilizes aluminum.
- the second layer examples include a layer made of at least one of an aluminum alloy oxide, a molybdenum oxide, a zirconium oxide, a chromium oxide, and a tantalum oxide.
- the oxide of the lanthanoid element has a high transmittance, so that this is included.
- the transmittance of the second layer is improved. For this reason, it is possible to maintain a high reflectance on the surface of the first layer.
- the second layer is made of ITO (Indium Tin A transparent conductive layer such as Oxide) or IZO (Indium Zinc Oxide) may be used. These conductive layers can improve the electron injection characteristics of the anode.
- the anode may be provided with a conductive layer for improving the adhesion between the anode and the transparent substrate on the side in contact with the substrate.
- a conductive layer include transparent conductive layers such as ITO and IZO.
- the hole injection layer and the hole transport layer are for increasing the efficiency of hole injection into the light emitting layer.
- the material for the hole injection layer or the hole transport layer include benzine, styrylamine, triphenylamine, porphyrin, triphenylene, azatriphenylene, tetracyanoquinodimethane, triazole, imidazole, oxadiazole, poly Heterocyclic conjugated monomers such as arylalkanes, phenylenediamines, arylamines, oxazoles, anthracenes, fluorenones, hydrazones, stilbenes or their derivatives, or polysilane compounds, vinylcarbazole compounds, thiophene compounds or aniline compounds An oligomer or a polymer can be used.
- the light emitting layer is a region where emitted light is generated by recombination of holes injected from the anode side and electrons injected from the transparent electrode (cathode side).
- a light emitting layer may be an organic thin film formed of an organic material composed only of carbon and hydrogen, and is configured using a material having a tertiary amine having a hole transporting property in a molecular structure. It may be a layer.
- the light emitting layer may be a mixed organic thin film containing a trace amount of an organic substance such as a berylene derivative, a coumarin derivative, a pyran dye, or a triphenylamine derivative as a dopant.
- the light emitting layer is formed by co-evaporation of the host material (main material) constituting the light emitting layer and the material to be the dopant.
- a material having a tertiary amine having a hole transporting property in the molecular structure has a characteristic that the intermolecular interaction is small and the concentration quenching is difficult, so that high concentration doping is possible and optimum. Functions as one of the dopants.
- the material constituting the light emitting layer as described above can be selected according to a desired color.
- a desired color For example, when it is desired to obtain blue light emission, oxadiazole derivatives, cyclopentadiene derivatives, pyrazoloquinoline derivatives, distyrylarylene derivatives, oligothiophene derivatives, and the like are used.
- a layer obtained by doping a blue light-emitting layer with a known green pigment such as a coumarin derivative such as coumarin 6 or a quinacridone derivative is used.
- red dyes such as pyran derivatives such as DCJT ⁇ 4- (dicyanomethylene) -2-t-butyl-6- (julolidylstyryl) -pyran ⁇ , squarylium derivatives, porphyrin derivatives, chlorin derivatives, eurodiline derivatives Layer is used.
- the light emitting layer may be a white light emitting layer in which a red light emitting layer, a green light emitting layer, and a blue light emitting layer are laminated, or may have a tandem structure in which a plurality of light emitting layers are laminated through a connection layer. good. Further, the light emitting layer can be an electron transporting light emitting layer that also serves as an electron transporting layer, and may be a hole transporting light emitting layer.
- the electron transport layer is for transporting electrons injected from the transparent electrode 104 (also referred to as a cathode) to the light emitting layer.
- the material for the electron transport layer include quinoline, perylene, phenanthroline, bisstyryl, pyrazine, triazole, oxazole, oxadiazole, fluorenone, and derivatives or metal complexes thereof.
- the light-emitting layer is not limited to such a layer structure, and it is sufficient that at least the light-emitting layer and the electron transport layer are provided in contact with the light-emitting layer. Can do.
- the light emitting layer may be provided in the organic EL element B as a hole transporting light emitting layer, an electron transporting light emitting layer, or a charge transporting light emitting layer.
- each layer constituting the organic light emitting layer 103 for example, a hole injection layer, a hole transport layer, a light emitting layer, and an electron transport layer may have a laminated structure including a plurality of layers.
- a transparent electrode 104 (also referred to as a cathode) is provided on the organic light emitting layer 103 having such a configuration.
- the transparent electrode 104 (also referred to as a cathode) is formed using a material having a small work function and good light transmittance.
- a material having a small work function and good light transmittance examples include lithium oxide (Li 2 O) which is an oxide of lithium (Li), cesium carbonate (Cs 2 CO 3 ) which is a composite oxide of cesium (Cs), and further Mixtures of oxides and composite oxides can be used.
- the transparent electrode 104 (also referred to as a cathode) is not limited to such a material, and examples thereof include alkaline earth metals such as calcium (Ca) and barium (Ba), alkali metals such as lithium and cesium, Furthermore, metals having a small work function such as indium (In) and magnesium (Mg), and oxides and composite oxides and fluorides of these metals alone or these metals and oxides and composite oxides. Alternatively, it may be used as a fluoride mixture or alloy with increased stability.
- a ⁇ / 4 retardation film 3 was produced according to the following method.
- a mixed solution of 300 g of acetic acid and 100 g of water was added dropwise over 20 minutes to hydrolyze excess anhydride. While maintaining the temperature of the reaction solution at 40 ° C., 900 g of acetic acid and 300 g of water were added and stirred for 1 hour. Next, the mixture was added to an aqueous solution containing 20 g of magnesium acetate, stirred for a while, filtered and dried to obtain cellulose acylate.
- the obtained cellulose acylate had a total acyl group substitution degree of 2.6, a propionyl group (carbon number 3) substitution degree of 0.7, an acetyl group substitution degree of 1.9, and a weight average molecular weight of 220,000.
- the total acyl group substitution degree and the substitution degree of propionyl group (3 carbon atoms) were measured in accordance with ASTM D-817-91.
- HPLC-MS measurement conditions are as follows.
- Fine particle additive solution 1 The fine particle dispersion 1 prepared above was slowly added to the dissolution tank containing methylene chloride with sufficient stirring. Further, the particles were dispersed by an attritor so that the secondary particles had a predetermined particle size. This was filtered through Finemet NF manufactured by Nippon Seisen Co., Ltd. to prepare a fine particle additive solution 1.
- methylene chloride and ethanol were added to the pressure dissolution tank as solvents.
- the prepared cellulose acylate was charged into a pressure dissolution tank containing a solvent while stirring. This was completely dissolved while heating and stirring.
- Azumi Filter Paper No. The main dope was prepared by filtration using 244.
- the solvent was evaporated until the amount of residual solvent in the cast (cast) film reached 75% by mass, and then peeled off from the stainless steel belt support.
- the peeled cellulose ester film was stretched in the width direction using a tenter while applying heat. Next, drying was completed while transporting the drying zone with a large number of rollers, and the ends sandwiched between tenter clips were slit and wound with a laser cutter. Subsequently, the obtained film was diagonally stretched to a stretch ratio of 2.0 times under the condition of 185 ° C. to obtain a ⁇ / 4 retardation film 3.
- the in-plane retardation Ro (550) of the obtained ⁇ / 4 retardation film 3 was 138 nm.
- the KC4UA film was immersed in a 2 mol / L sodium hydroxide solution at 60 ° C. for 90 seconds, then washed with water and dried to saponify the side to be bonded to the polarizer.
- the surface of the prepared ⁇ / 4 retardation film 1 was subjected to corona discharge treatment.
- the prepared coating liquid for forming the layer A1 is applied to the corona discharge-treated surface of the ⁇ / 4 retardation film 1 with a bar coater so that the film thickness after curing is about 3.0 ⁇ m. Formed.
- the integrated light quantity is 750 mJ using an ultraviolet irradiation device with a belt conveyor (the lamp uses a D bulb manufactured by Fusion UV Systems).
- the layer A1 was cured by irradiating ultraviolet rays so as to be / cm 2, and the circularly polarizing plate 1 was obtained.
- Circularly polarizing plates 2 to 15 were produced in the same manner except that the storage elastic modulus shown in Table 1 was changed.
- Circular Polarizing Plate 16 In the production of the circularly polarizing plate 10, a circularly polarizing plate 16 was produced in the same manner except that the layer B1 was formed between the protective film and the polarizer.
- the coating liquid for forming the layer A3 is barized so that the film thickness after curing is about 3 ⁇ m in the same manner as the circular polarizing plate 10. Coating was performed with a coater, and then the layer A3 was formed by irradiating and curing ultraviolet rays so that the integrated light amount was 1200 mJ / cm 2 . The obtained layer A3 was bonded to the polarizer side of the produced polarizing plate to produce a polarizing plate.
- the above-prepared coating solution for forming the layer B1 is applied to the corona discharge treated surface of KC4UA with a bar coater so that the film thickness after curing is about 3 ⁇ m, so that the integrated light amount becomes 1200 mJ / cm 2.
- the layer B1 was formed by irradiating and curing ultraviolet rays.
- a circularly polarizing plate 16 was produced by pasting the obtained layer B1 on the polarizer side of the produced polarizing plate.
- ⁇ Composition of coating liquid for forming layer B2> 3,4-Epoxycyclohexylmethyl 3,4-epoxycyclohexanecarboxylate 60 parts by mass Epolide GT-301 (Daicel Chemical Industries alicyclic epoxy resin) 25 parts by mass 1,4-butanediol diglycidyl ether 15 parts by mass Triarylsulfonium hexafluorophosphate 2.70 parts by mass 9,10-dibutoxyanthracene 0.1 parts by mass 1,4-diethoxynaphthalene 2.0 parts by mass
- ⁇ Ultraviolet irradiation conditions> Using an ultraviolet irradiation device with a belt conveyor (the lamp uses a D bulb manufactured by Fusion UV Systems, Inc.), the layer was irradiated with ultraviolet rays so as to have an integrated light amount of 900 mJ / cm 2 and cured to form layer B2.
- ⁇ Composition of coating solution for forming layer B3> 3,4-Epoxycyclohexylmethyl 3,4-Epoxycyclohexanecarboxylate 63 parts by mass Epolide GT-301 (Daicel Chemical Industries alicyclic epoxy resin) 22 parts by mass 1,4-butanediol diglycidyl ether 15 parts by mass Triarylsulfonium hexafluorophosphate 2.40 parts by mass 9,10-dibutoxyanthracene 0.1 parts by mass 1,4-diethoxynaphthalene 2.0 parts by mass ⁇ Ultraviolet irradiation conditions> Using an ultraviolet irradiation device with a belt conveyor (the lamp uses a D bulb manufactured by Fusion UV Systems, Inc.), the layer B3 was formed by irradiating it with ultraviolet rays so that the integrated light amount became 800 mJ / cm 2 .
- each of the produced single films was cut into a size of 3 cm ⁇ 1 cm, and the obtained layer A or layer B was obtained using a dynamic viscoelasticity measuring device DVA-220 manufactured by IT Measurement Control Co., Ltd.
- the single film was gripped at an interval of 2 cm between the left and right grips so that the long side was in the pulling direction, and the storage elastic modulus at 25 ° C. was determined.
- a protective film having a single layer or a protective layer B is conditioned at a temperature of 20 ° C. and a relative humidity of 55% for 24 hours.
- the distance Lp (20 ° C.) was accurately measured.
- the distance Lp (80 ° C.) marked with a cutter at an interval of about 10 cm on each of the width and the length is accurate.
- the dimensional change rate (absolute value) A of the protective film was measured by the following formula (2).
- the spectral absorption characteristics of the layer A single layer were measured according to the following method.
- the layer A1 forming coating solution to the layer A6 forming coating solution used for the production of the circularly polarizing plates 1 to 3 and 7 to 20 were used as release films, respectively, as a release film made of polyethylene terephthalate having a thickness of 38 ⁇ m (manufactured by Lintec Corporation)
- a release film made of polyethylene terephthalate having a thickness of 38 ⁇ m manufactured by Lintec Corporation
- coating was performed with a bar coater so that the film thickness after curing was about 3 ⁇ m, and then ultraviolet rays were irradiated and cured so that the integrated light amount was 1200 mJ / cm 2. Formed.
- the formed layer A was peeled from the polyethylene terephthalate release film to obtain a single layer A film.
- the spectral transmittance at a wavelength of 200 nm to 800 nm was measured using a spectrophotometer U-4000 type manufactured by Hitachi, Ltd., and the maximum absorption wavelength (in the ultraviolet region of 200 to 400 nm) ( As a result of confirming the presence or absence of ( ⁇ max), it was confirmed that all layers A had a maximum absorption wavelength in the wavelength region of 200 to 400 nm.
- a reflective electrode made of chromium is formed on a transparent glass substrate 1a
- ITO is formed as a metal electrode 2a (anode) on the reflective electrode
- poly (3,4) is formed as a hole transport layer on the anode.
- -Ethylenedioxythiophene) -polystyrene sulfonate (PEDOT: PSS) was formed by sputtering to a thickness of 80 nm, and then a shadow mask was used on the hole transport layer, and as shown in FIG. 3aG and 3aB were formed with a film thickness of 100 nm.
- red light emitting layer 3aR tris (8-hydroxyquinolinate) aluminum (Alq 3 ) as a host and a light emitting compound [4- (dicyanomethylene) -2-methyl-6 (p-dimethylaminostyryl) -4H-pyran] ( DCM) were co-evaporated (mass ratio 99: 1) to form a thickness of 100 nm.
- the green light emitting layer 3aG was formed to a thickness of 100 nm by co-evaporating Alq 3 as a host and the light emitting compound coumarin 6 (mass ratio 99: 1).
- the blue light emitting layer 3aB was formed with a thickness of 100 nm by co-evaporating BAlq and a light emitting compound Perylene as a host (mass ratio 90:10).
- calcium is deposited to a thickness of 4 nm by vacuum deposition as a first cathode having a low work function so that electrons can be efficiently injected onto the light emitting layer, and as a second cathode on the first cathode.
- Aluminum was formed with a thickness of 2 nm.
- the aluminum used as the second cathode has a role to prevent calcium as the first cathode from being chemically altered when the transparent electrode 4a formed thereon is formed by sputtering. .
- an organic light emitting layer was obtained.
- a transparent conductive film was formed to a thickness of 80 nm on the cathode by sputtering.
- ITO was used as the transparent conductive film.
- 200 nm of silicon nitride was deposited on the transparent conductive film by the CVD method to form the insulating film 5a.
- the light emitting area of the produced organic EL element was 1296 mm ⁇ 784 mm. Further, the front luminance when a DC voltage of 6 V was applied to the organic EL element was 1200 cd / m 2 .
- the front luminance is measured using a spectral radiance meter CS-1000 manufactured by Konica Minolta Sensing Co., Ltd. with the front luminance at 2 ° C. and the optical axis of the spectral radiance meter aligned with the normal from the light emitting surface.
- the visible light wavelength range of 430 to 480 nm was measured, and the integrated intensity was taken.
- the visibility evaluation is performed by 10 persons, and the visibility in the condition A (storage at normal temperature and humidity) and the visibility in the condition B after storage at high temperature and high humidity are compared. If it is equivalent to the visibility in Condition A (stored at normal temperature and normal humidity), it is “3 points”, and if it is judged that the visibility is slightly lowered, “2 points”, the visibility is slightly lowered. “1 point” when it was determined, and “0 point” when it was determined that the visibility was clearly lowered. The total score of 10 evaluation scores was obtained, and the visibility in a high temperature and high humidity environment was determined according to the following evaluation rank.
- ⁇ Total score is 27 or more ⁇ : Total score is 24 or more and 26 or less ⁇ : Total score is 18 or more and 23 or less ⁇ : Total score is 17 or less [Durability (Evaluation of property: forced deterioration test)
- Each of the produced organic EL display devices was stored at 20 ° C. for 10 minutes in a dry environment (relative humidity of 20% or less) using a temperature impact tester, and then stored at 50 ° C. for 10 minutes (this is 1 After the forced deterioration test for 1000 cycles), the image display unevenness when taken out from the temperature impact tester and displayed in white is compared with the white display image before the forced deterioration test, and the following is observed.
- Durability was evaluated according to the criteria of
- A The organic EL display device subjected to the forced deterioration treatment has extremely good flatness and no warping is observed.
- ⁇ The organic EL display device subjected to the forced deterioration treatment has excellent flatness and has no warpage. O: Almost no occurrence
- ⁇ The organic EL display device subjected to the forced deterioration treatment is somewhat acceptable in quality although the occurrence of slight warping is recognized.
- ⁇ In the organic EL display device subjected to the forced deterioration treatment The occurrence of a strong warp is recognized, but the quality is a problem in practical use. Table 1 shows the results obtained as described above.
- the organic EL display device using the circularly polarizing plate having the configuration defined in the present invention has a higher visibility and durability (in a high-temperature and high-humidity environment) than the comparative example. It can be seen that it has excellent effects on stability and panel deterioration resistance (flatness).
- the organic electroluminescence display device of the present invention is excellent in visibility, durability (image unevenness resistance) and panel deterioration resistance (flatness) when stored for a long period of time in a high-temperature and high-humidity environment. It can be suitably used for various light sources such as a light source, a backlight for a liquid crystal display, a backlight for a liquid crystal projector, and a display device.
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Abstract
Description
寸法変化率差C=|{(Lp(80℃)-Lp(20℃))/Lp(20℃)}×100|-|{(Lq(80℃)-Lq(20℃))/Lq(20℃)}×100|(%)
(式中、Lp(20℃)は保護フィルム単層の20℃における基準寸法であり、Lp(80℃)は保護フィルム単層の該Lp(20℃)の80℃における寸法を表す。Lq(20℃)は層Aを有するλ/4位相差フィルムの20℃における基準寸法であり、Lq(80℃)は層Aを有するλ/4位相差フィルムの該Lq(20℃)の80℃における寸法を表す。)
3.前記層Aが前記偏光子と前記λ/4位相差フィルムとの間に有し、かつ前記保護フィルムと前記偏光子との間に層Bを有し、該層Aの貯蔵弾性率を貯蔵弾性率Aとし、該層Bの貯蔵弾性率を貯蔵弾性率Bとしたとき、貯蔵弾性率A>貯蔵弾性率Bの関係を満たすことを特徴とする第1項又は第2項に記載の有機エレクトロルミネッセンス表示装置。
寸法変化率差C=|{(Lp(80℃)-Lp(20℃))/Lp(20℃)}×100|-|{(Lq(80℃)-Lq(20℃))/Lq(20℃)}×100|(%)
(式中、Lp(20℃)は保護フィルム単層の20℃における基準寸法であり、Lp(80℃)は保護フィルム単層の該Lp(20℃)の80℃における寸法を表す。Lq(20℃)は層Aを有するλ/4位相差フィルム単層の20℃における基準寸法であり、Lq(80℃)は層Aを有するλ/4位相差フィルム単層の該Lq(20℃)の80℃における寸法を表す。)
8.前記層Aが前記偏光子と前記λ/4位相差フィルムとの間に有し、かつ前記保護フィルムと前記偏光子との間に層Bを有し、該層Aの貯蔵弾性率を貯蔵弾性率Aとし、該層Bの貯蔵弾性率を貯蔵弾性率Bとしたとき、貯蔵弾性率A>貯蔵弾性率Bの関係を満たすことを特徴とする第6項又は第7項に記載の円偏光板。
はじめに、本発明の有機エレクトロルミネッセンス表示装置を構成の概要について説明する。
以下に、本発明の円偏光板の各構成要素の詳細について説明する。
本発明の円偏光板は、少なくとも保護フィルム、偏光子及びλ/4位相差フィルムがこの順で構成され、λ/4位相差フィルムの少なくとも一方の面に、貯蔵弾性率が100~500MPaの範囲にある層Aを有することを特徴とする。このような構成からなる円偏光板を、有機EL表示装置に使用することにより、有機EL発光体の金属電極の鏡面反射を遮蔽することができる。
本発明の円偏光板においては、後述する保護フィルムと、層Aを有するλ/4位相差フィルムとの下記式(1)で規定する寸法変化率差C(%)が、0.1~10.0%の範囲内であることが好ましい。
寸法変化率差C=|{(Lp(80℃)-Lp(20℃))/Lp(20℃)}×100|-|{(Lq(80℃)-Lq(20℃))/Lq(20℃)}×100|(%)
上記式(1)において、Lp(20℃)は保護フィルム単層の20℃における基準寸法であり、Lp(80℃)は保護フィルム単層の該Lp(20℃)の80℃における寸法を表す。Lq(20℃)は層Aを有するλ/4位相差フィルムの20℃における基準寸法であり、Lq(80℃)は層Aを有するλ/4位相差フィルムの該Lq(20℃)の80℃における寸法を表す。
保護フィルムの寸法変化率A=|{(Lp(80℃)-Lp(20℃))/Lp(20℃)}×100|(%)
次いで、λ/4位相差フィルム上に層Aを形成した試料についても、上記と同様の方法で、温度20℃、相対湿度55%に調湿された環境下で24時間調湿した後の基準寸法であるLq(20℃)と、温度80℃、相対湿度55%に調湿された環境下で24時間保管した後の距離Lq(80℃)を正確に測定し、下式(3)により、層Aを有するλ/4位相差フィルムの寸法変化率(絶対値)Bを測定した。
層Aを有するλ/4位相差フィルムの寸法変化率B=|{(Lq80℃)-Lq(20℃))/Lq(20℃)}×100|(%)
上記測定した保護フィルムの寸法変化率Aと層Aを有するλ/4位相差フィルムの寸法変化率Bとの寸法変化率差を前記式(1)に従って求め、これを寸法変化率差C(%)とした。
本発明に係る保護フィルム(図1に記載の110)を構成する材料としては、例えば、トリアセチルセルロースフィルム、セルロースアセテートプロピオネートフィルム、セルロースジアセテートフィルム、セルロースアセテートブチレートフィルム等のセルロースエステル系フィルム、ポリエチレンテレフタレート、ポリエチレンナフタレート等のポリエステル系フィルム、ポリカーボネート系フィルム、ポリアリレート系フィルム、ポリスルホン(ポリエーテルスルホンも含む)系フィルム、ポリエチレンフィルム、ポリプロピレンフィルム、セロファン、ポリ塩化ビニリデンフィルム、ポリビニルアルコールフィルム、エチレンビニルアルコールフィルム、シンジオタクティックポリスチレン系フィルム、ノルボルネン樹脂系フィルム、ポリメチルペンテンフィルム、ポリエーテルケトンフィルム、ポリエーテルケトンイミドフィルム、ポリアミドフィルム、フッ素樹脂フィルム、ナイロンフィルム、シクロオレフィンポリマーフィルム、ポリメチルメタクリレートフィルム又はアクリルフィルム等を挙げることができる。
図1に示した本発明の有機EL表示装置を構成する偏光子109としては、目的に応じて任意の適切な偏光子が採用され得る。例えば、ポリビニルアルコール系フィルム、部分ホルマール化ポリビニルアルコール系フィルム、エチレン・酢酸ビニル共重合体系部分ケン化フィルム等の親水性ポリマーフィルムに、ヨウ素や二色性染料等の二色性物質を吸着させて一軸延伸したもの、ポリビニルアルコールの脱水処理物やポリ塩化ビニルの脱塩酸処理物等ポリエン系配向フィルム等が挙げられる。これらのなかでも、ポリビニルアルコール系フィルムにヨウ素などの二色性物質を吸着させて一軸延伸した偏光子が、偏光二色比が高く特に好ましい。これら偏光子の厚さは、特に制限されないが、一般的に、1~80μm程度である。
本発明の円偏光板に用いるλ/4位相差フィルムについて、その詳細を説明する。
Ro=(nx-ny)×d
式(i)において、nxはフィルム面内における遅相軸x方向における屈折率、nyはフィルム面内におけるx方向に直交するy方向における屈折率、dはフィルムの膜厚(nm)を表す。各屈折率は、23℃、55%RHの環境下において、測定波長550nmで測定する。
本発明に係るλ/4位相差フィルムは、リターデーション発現性が高く、高いリターデーションを有する位相差フィルムとする場合であっても、薄膜化が可能であり、高いリターデーションを発現させることができ、高倍延伸を行っても、高温高湿環境下で長期間にわたり保存した際の視認性及び耐久性と、鹸化適性に優れている特性を有している。
本発明に適用可能なセルロース系樹脂のひとつとして、セルロースアセテートを挙げることができる。セルロースアセテートとしては、平均アセチル基置換度が2.00以上であることが好ましく、より好ましくは2.00~2.95の範囲であり、2.20~2.90の範囲であることが更に好ましい。ここでいう平均アセチル基平均置換度とは、セルロースを構成する各無水グルコースの有する3個のヒドロキシ基(水酸基)のうち、エステル化(アセチル化)されているヒドロキシ基(水酸基)の数の平均値を示し、0~3.0の範囲内の値を示す。
カラム:Shodex K806、K805、K803G(昭和電工(株)製を3本接続して使用した)
カラム温度:25℃
試料濃度:0.1質量%
検出器:RI Model 504(GLサイエンス社製)
ポンプ:L6000(日立製作所(株)製)
流量:1.0ml/min
校正曲線:標準ポリスチレンSTK standard ポリスチレン(東ソー(株)製)Mw=1000000~500の13サンプルによる校正曲線を使用した。13サンプルは、ほぼ等間隔に用いる。
2.0≦X+Y≦2.9
式(2)
0≦Y≦1.5
式中、Xはアセチル基の置換度、Yはプロピオニル基又はブチリル基、もしくはその混合物の置換度である。なお、アセチル基の置換度と他のアシル基の置換度は、ASTM-D817-96に規定の方法により求めることができる。
本発明に係るλ/4位相差フィルムの作製に用いることのできるポリカーボネート樹脂は、芳香族2価フェノールとカーボネート前駆体との反応によって得た芳香族ポリカーボネートが好ましい。
本発明に係るλ/4位相差フィルムの作製に用いることのできるポリオレフィン系樹脂としては、ポリプロピレンやポリエチレン樹脂が好適に用いられるが、これらに限定されるものではない。また、これらの樹脂には、相溶性のある2種類以上の樹脂が用いられてもよい。具体例として、特開2007-316603号公報等に記載の化合物を挙げることができる。
本発明に係るλ/4位相差フィルムには、添加剤として、組成物の流動性や柔軟性を向上する目的で、各種可塑剤を併用することもできる。本発明に適用可能な可塑剤としては、例えば、フタル酸エステル系可塑剤、脂肪酸エステル系可塑剤、トリメリット酸エステル系可塑剤、リン酸エステル系可塑剤、ポリエステル系可塑剤、糖エステル系可塑剤、エポキシ系可塑剤、多価アルコールエステル系可塑剤等が挙げられる。用途に応じてこれらの可塑剤を選択、あるいは併用することによって、広範囲の用途に適用できる。
R1-(OH)n
上記一般式(a)において、R1はn価の有機基を表し、nは2以上の正の整数を表す。OH基はアルコール性又はフェノール性ヒドロキシ基(水酸基)を表す。
次に、本発明に係るλ/4位相差フィルムの製膜方法の一例を説明するが、ここで説明する方法に限定されるものではない。
本発明に係るλ/4位相差フィルムは、溶液流延法によって製造することができる。溶液流延法では、樹脂及び添加剤を有機溶媒に溶解させてドープを調製する工程、ドープをベルト状もしくはドラム状の金属支持体上に流延する工程、流延したドープをウェブとして乾燥する工程、金属支持体から剥離する工程、延伸又は幅保持する工程、更に乾燥する工程、仕上がったフィルムを巻き取る工程により行われる。
なお、Mは、ウェブ又はフィルムを製造中又は製造後の任意の時点で採取した時の試料の質量である。Nは、Mを115℃で1時間の加熱した後の質量である。
本発明に係るλ/4位相差フィルムは、波長550nmで測定した面内方向のリターデーションRo(550)が100~180nmの範囲であることが好ましい。該リターデーションRo(550)は、フィルム延伸によって付与することが好ましい。
tanθf=W/(Ay-Ax)
即ち、
tanθf=W/|LA-LB|
を満たす角度となる。
R=L/Wo
で定義される。
2)予熱ゾーン/横延伸ゾーン/斜め延伸ゾーン/保持ゾーン/冷却ゾーン
3)予熱ゾーン/斜め延伸ゾーン/横延伸ゾーン/保持ゾーン/冷却ゾーン
4)予熱ゾーン/横延伸ゾーン1/斜め延伸ゾーン/横延伸ゾーン2/保持ゾーン/冷却ゾーン
5)予熱ゾーン/横延伸ゾーン1/斜め延伸ゾーン1/横延伸ゾーン2/斜め延伸ゾーン2/保持ゾーン/冷却ゾーン
予熱ゾーンとは、オーブン入口部において、フィルムの両端を把持した把持具の間隔が一定の間隔を保ったまま走行する区間をさす。
本発明に係るλ/4位相差フィルムは、溶融製膜法によって製膜することもできる。溶融製膜法は、樹脂及び可塑剤などの添加剤を含む組成物を、流動性を示す温度まで加熱溶融し、その後、流動性のセルロースアセテートを含む溶融物を流延することをいう。
本発明に係るλ/4位相差フィルムの膜厚は、特に限定はされないが、10~250μmの範囲で用いられる。更には、膜厚が10~100μmの範囲であることが好ましく、特には30~60μmであることが好ましい。
本発明に係る層Aは、λ/4位相差フィルムの少なくとも一方の面に形成され、貯蔵弾性率が100~500MPaの範囲内であることを特徴とし、偏光子とλ/4位相差フィルムとの間に形成されることが好ましい。
本発明に係る層Aを形成する材料としては、特に制限はないが、紫外線硬化性樹脂であることが好ましい。
本発明に適用可能な紫外線硬化性樹脂としては、より好ましくは、カチオン重合性化合物である。
本発明で用いられる単官能エポキシドの例としては、例えば、フェニルグリシジルエーテル、p-tert-ブチルフェニルグリシジルエーテル、ブチルグリシジルエーテル、2-エチルヘキシルグリシジルエーテル、アリルグリシジルエーテル、1,2-ブチレンオキサイド、1,3-ブタジエンモノオキサイド、1,2-エポキシドデカン、エピクロロヒドリン、1,2-エポキシデカン、スチレンオキサイド、シクロヘキセンオキサイド、3-メタクリロイルオキシメチルシクロヘキセンオキサイド、3-アクリロイルオキシメチルシクロヘキセンオキサイド、3-ビニルシクロヘキセンオキサイド等が挙げられる。
オキセタン環を有する化合物としては、特開2001-220526号、同2001-310937号に紹介されているような公知のあらゆるオキセタン化合物を併用することができる。
ビニルエーテル基を有する化合物としては、あらゆる公知のビニルエーテル化合物を併用することができる。
本発明に係る層Aの形成において、カチオン重合性化合物と共に、光重合開始剤を用いる。光重合開始剤としては、「UV・EB硬化技術の応用と市場」(シーエムシー出版、田畑米穂監修/ラドテック研究会編集)などに掲載されているあらゆる公知の光重合開始剤を用いることができる。
本発明に係る層Aには、貯蔵弾性率の達成に影響を及ぼさない範囲で、各種添加剤を用いることができ、例えば、λ/4位相差フィルムの説明で記載したのと同様な可塑剤、多価アルコールエステル、紫外線吸収剤、円盤状化合物、リン系難燃剤、マット剤等を用いることが好ましい。
λ/4位相差フィルム上に、層A形成用塗工液により層Aを形成するのに用いる塗布方式としては、湿式塗布方法が好ましく、例えば、スピンコート塗布、ディップ塗布、エクストルージョン塗布、ローラコート塗布スプレー塗布、グラビア塗布、ワイヤーバー塗布、エアナイフ塗布等を挙げることができる。
〈貯蔵弾性率〉
本発明に係る層Aは、貯蔵弾性率が100~500MPaの範囲内であることを特徴とし、好ましくは、130~400MPaの範囲内であり、更に好ましくは、150~300MPaの範囲内である。
本発明に係る層Aの分光吸収特性として、波長として200~400nmの範囲の紫外領域に、吸収波長の最大値(λmax)を有していることが好ましい。
本発明に係る層Bは、保護フィルムと偏光子との間に配置され、貯蔵弾性率が、上記説明した本発明に係る層Aの貯蔵弾性率未満であることが好ましい。層Bの貯蔵弾性率としては、層Aの貯蔵弾性率にも関係するが、概ね500MPa未満であることが好ましい。
本発明に係る層Bを構成する材料としては、特に制限は無いが、例えば、所望の貯蔵弾性率となるように、上記層Aの構成に用いたのと同様の構成材料を適宜選択して用いることができる。
また、本発明に係る層Bについては、本発明の目的効果を損なわない範囲で、各種添加剤を用いることができ、例えば、λ/4位相差フィルムの説明で記載したのと同様な可塑剤、多価アルコールエステル、紫外線吸収剤、円盤状化合物、リン系難燃剤、マット剤等を用いることが好ましい。
本発明に係る層Bは、層B形成用塗工液を用いて形成する。層Bの形成に用いることのできる塗布方式としては、湿式塗布方法が好ましく、例えば、スピンコート塗布、ディップ塗布、エクストルージョン塗布、ローラコート塗布スプレー塗布、グラビア塗布、ワイヤーバー塗布、エアナイフ塗布等を挙げることができる。
(表面反射防止層)
上記円偏光板の保護フィルムには、直接又は他の層を介して表面反射防止層(図1に記載の11)を塗設して、外光反射防止機能を付与させることが好ましい。
保護フィルム/中屈折率層/低屈折率層
保護フィルム/中屈折率層/高屈折率層/低屈折率層
保護フィルム/高屈折率層(導電性層)/低屈折率層
〈低屈折率層〉
表面反射防止層においては、低屈折率層が必須の構成要件であり、シリカ系微粒子を含有することが好ましく、その屈折率は、支持体である基材フィルムの屈折率より低く、23℃、波長550nm測定で、1.30~1.45の範囲であることが好ましい。
Si(OR)4
上記一般式(OSi-1)で表される有機珪素化合物において、Rは炭素数1~4のアルキル基を表す。具体的な有機珪素化合物としては、テトラメトキシシラン、テトラエトキシシラン、テトライソプロポキシシラン等が好ましく用いられる。
高屈折率層の屈折率は、23℃、波長550nmの条件での測定で、屈折率として1.4~2.2の範囲に調整することが好ましい。また、高屈折率層の厚さは5nm~1μmが好ましく、10~200nmの範囲であることが更に好ましく、30~100nmの範囲であることが最も好ましい。所望の屈折率への調整は、金属酸化物微粒子等を添加することにより達成できる。また、用いる金属酸化物微粒子としては、屈折率が1.80~2.60の範囲内にあるものが好ましく、1.85~2.50であるものが更に好ましい。
次いで、本発明の有機EL表示装置を構成する有機EL素子の各構成要素について説明する。
図1及び図2に示した有機EL表示装置に用いることのできる基板101としては、ガラス、プラスチック等の種類には特に限定はなく、透明であっても不透明であってもよい。基板1側から光を取り出す場合には、基板1は透明であることが好ましい。好ましく用いられる透明な基板としては、ガラス、石英、透明樹脂フィルムを挙げることができる。
樹脂フィルムとしては、例えば、ポリエチレンテレフタレート(PET)、ポリエチレンナフタレート(PEN)等のポリエステル、ポリエチレン、ポリプロピレン、セロファン、セルロースジアセテート(DAC)、セルローストリアセテート(TAC)、セルロースアセテートブチレート、セルロースアセテートプロピオネート(CAP)、セルロースアセテートフタレート、セルロースナイトレート等のセルロースエステル類又はそれらの誘導体、ポリ塩化ビニリデン、ポリビニルアルコール、ポリエチレンビニルアルコール、シンジオタクティックポリスチレン、ポリカーボネート、ノルボルネン樹脂、ポリメチルペンテン、ポリエーテルケトン、ポリイミド、ポリエーテルスルホン(PES)、ポリフェニレンスルフィド、ポリスルホン類、ポリエーテルイミド、ポリエーテルケトンイミド、ポリアミド、フッ素樹脂、ナイロン、ポリメチルメタクリレート、アクリルあるいはポリアリレート類、アートン(商品名、JSR社製)あるいはアペル(商品名、三井化学社製)といったシクロオレフィン系樹脂等を挙げられる。
前記基板は、有機エレクトロルミネッセンス表示装置の反りを防止する観点から、ガラス板が好ましい。該ガラス板の厚みは、0.1~10mmの範囲内が好ましい。0.1mm以上であれば、耐久性が良く、搬送時あるいは使用時の微弱な衝撃で割れることが無く、また熱をかけた際でも反りを生じず、割れによる視認性の劣化が無い。また、10mm以下であれば、有機エレクトロルミネッセンス表示装置を軽く設計することができ、製造コストも抑えることができる。
金属電極(陽極ともいう)には、効率良く正孔を注入するために電極材料の真空準位からの仕事関数が大きいもの、例えば、アルミニウム(Al)、クロム(Cr)、モリブテン(Mo)、タングステン(W)、銅(Cu)、銀(Ag)、金(Au)の金属及びその合金更にはこれらの金属や合金の酸化物等、又は、酸化スズ(SnO2)とアンチモン(Sb)との合金、ITO(インジウムチンオキシド)、InZnO(インジウ亜鉛オキシド)、酸化亜鉛(ZnO)とアルミニウム(Al)との合金、更にはこれらの金属や合金の酸化物等が、単独又は混在させた状態で用いられる。
Oxide)やIZO(Indium Zinc Oxide)などの透明導電層であっても良い。これらの導電層は、陽極の電子注入特性を改善することができる。
(正孔注入層/正孔輸送層)
正孔注入層及び正孔輸送層は、それぞれ発光層への正孔注入効率を高めるためのものである。このような正孔注入層もしくは正孔輸送層の材料としては、例えば、ベンジン、スチリルアミン、トリフェニルアミン、ポルフィリン、トリフェニレン、アザトリフェニレン、テトラシアノキノジメタン、トリアゾール、イミダゾール、オキサジアゾール、ポリアリールアルカン、フェニレンジアミン、アリールアミン、オキザゾール、アントラセン、フルオレノン、ヒドラゾン、スチルベンあるいはこれらの誘導体、又は、ポリシラン系化合物、ビニルカルバゾール系化合物、チオフェン系化合物あるいはアニリン系化合物等の複素環式共役系のモノマー、オリゴマーあるいはポリマーを用いることができる。
発光層は、陽極側から注入された正孔と、透明電極(陰極側)から注入された電子とが再結合して発光光を発生する領域である。このような発光層は、炭素及び水素のみから構成される有機材料で形成された有機薄膜であっても良く、正孔輸送性を示す三級アミンを分子構造中に有する材料を用いて構成された層であっても良い。加えて、発光層は、ドーパントとして、ベリレン誘導体、クマリン誘導体、ピラン系色素、トリフェニルアミン誘導体等の有機物質を微量含む混合有機薄膜であっても良い。この場合には発光層を構成するホスト材料(主材料)と、ドーパントとなる材料との共蒸着によって、発光層が形成される。また特に、正孔輸送性を示す三級アミンを分子構造中に有する材料のうち、分子間相互作用が小さく濃度消光しにくい特徴を有するものであれば、高濃度のドーピングが可能になり、最適なドーパントの1つとして機能する。
電子輸送層は、透明電極104(陰極ともいう)から注入される電子を発光層に輸送するためのものである。電子輸送層の材料としては、例えば、キノリン、ペリレン、フェナントロリン、ビススチリル、ピラジン、トリアゾール、オキサゾール、オキサジアゾール、フルオレノン、又はこれらの誘導体や金属錯体が挙げられる。具体的には、トリス(8-ヒドロキシキノリン)アルミニウム(略称;Alq3)、アントラセン、ナフタレン、フェナントレン、ピレン、アントラセン、ペリレン、ブタジエン、クマリン、アクリジン、スチルベン、1,10-フェナントロリン又はこれらの誘導体や金属錯体が挙げられる。
次に、このような構成の有機発光層103上に透明電極104(陰極ともいう)が設けられている。
〔λ/4位相差フィルム1〕
帝人社製のWRSを用い、550nmにおける位相差Ro(550)が138nmとなるよう、緩和及び延伸処理を施し、これをλ/4位相差フィルム1とした。
積水化学社製のエスシーナを用い、550nmにおける位相差Ro(550)が138nmとなるよう、緩和及び延伸処理を施し、これをλ/4位相差フィルム1とした。
下記の方法に従って、λ/4位相差フィルム3を作製した。
〈セルロースアシレートの合成〉
セルロース(日本製紙(株)製溶解パルプ)280gに、酢酸1100g、プロピオン酸250gを加え、54℃で40分間撹拌した。次いで、混合物を冷却した後、氷浴中で冷却した無水酢酸300g、無水プロピオン酸600gと、硫酸の12gを加えてエステル化を行った。なお、エステル化においては、液温が40℃を超えないように調節しながら、200分間の攪拌を行った。反応終了後、酢酸300gと水100gの混合液を20分かけて滴下して、過剰の無水物を加水分解した。反応液の温度を40℃に保持しながら、酢酸900gと水300gを加えて1時間撹拌した。次いで、酢酸マグネシウム20gを含有した水溶液中に上記混合物を添加し、しばらく撹拌した後、ろ過、乾燥し、セルロースアシレートを得た。得られたセルロースアシレートは、総アシル基置換度は2.6、プロピオニル基(炭素数3)置換度は0.7、アセチル基置換度は1.9、重量平均分子量は220000であった。なお、総アシル基置換度及びプロピオニル基(炭素数3)の置換度の測定方法は、ASTMのD-817-91に準じて行った。
下記の方法に従って、糖エステル化合物Aを合成した。
装置:日本分光(株)製カラムオーブン(JASCO CO-965)、ディテクター(JASCO UV-970-240nm)、ポンプ(JASCO PU-980)、デガッサ-(JASCO DG-980-50)
カラム:Inertsil ODS-3 粒子径5μm 4.6×250mm(ジーエルサイエンス(株)製)
カラム温度:40℃
流速:1ml/min
移動相:テトラヒドロフラン(1%酢酸):H2O(50:50)
注入量:3μl
2)MS部
装置:LCQ DECA(Thermo Quest(株)製)
イオン化法:エレクトロスプレーイオン化(ESI)法
Spray Voltage:5kV
Capillary温度:180℃
Vaporizer温度:450℃
(微粒子添加液の調製)
〈微粒子分散液1の調製〉
微粒子(アエロジル R972V 日本アエロジル(株)製)11質量部
エタノール 89質量部
以上をディゾルバーで50分間攪拌混合した後、マントンゴーリンで分散を行った。
メチレンクロライドを入れた溶解タンクに十分攪拌しながら、上記調製した微粒子分散液1をゆっくりと添加した。更に、二次粒子の粒径が所定の大きさとなるようにアトライターにて分散を行った。これを日本精線(株)製のファインメットNFで濾過し、微粒子添加液1を調製した。
微粒子分散液1 5質量部
(主ドープ)
下記組成の主ドープを調製した。
メチレンクロライド 340質量部
エタノール 64質量部
セルロースアシレート(総アシル基置換度:2.6、プロピオニル基置換度:0.7、アセチル基置換度1.9、重量平均分子量:220000)
100質量部
糖エステル化合物A 5.0質量部
微粒子添加液1 1.0質量部
(フィルム製膜)
上記調製した主ドープを、無端ベルト流延装置を用い、ステンレスベルト支持体上に均一に流延した。
〔円偏光板1作製〕
(偏光子の作製)
厚さ70μmのポリビニルアルコールフィルムを、35℃の水で膨潤させた。得られたフィルムを、ヨウ素0.075g、ヨウ化カリウム5g及び水100gからなる水溶液に60秒間浸漬し、更に、ヨウ化カリウム3g、ホウ酸7.5g及び水100gからなる45℃の水溶液に浸漬した。そして、得られたフィルムを、延伸温度55℃、延伸倍率5倍の条件で一軸延伸した。この一軸延伸フィルムを、水洗した後、乾燥させて、厚さ20μmの偏光子を得た。
以下の各成分を混合した後、脱泡して、層A1形成用塗布液を調製した。なお、トリアリールスルホニウムヘキサフルオロホスフェートは、50%プロピレンカーボネート溶液として配合し、下記にはトリアリールスルホニウムヘキサフルオロホスフェートの固形分量を表示した。
3,4-エポキシシクロヘキシルメチル3,4-エポキシシクロヘキサンカルボキシレート 65質量部
エポリードGT-301(ダイセル化学社製脂環式エポキシ樹脂)
20質量部
1,4-ブタンジオールジグリシジルエーテル 15質量部
トリアリールスルホニウムヘキサフルオロホスフェート 2.25質量部
9,10-ジブトキシアントラセン 0.1質量部
1,4-ジエトキシナフタレン 2.0質量部
(偏光板の作製)
KC4UA(コニカミノルタアドバンストレイヤー(株)製)フィルム(保護フィルム)を準備し、下記のようにして偏光板を作製した。
前記準備したλ/4位相差フィルム1の表面にコロナ放電処理を施した。次いで、λ/4位相差フィルム1のコロナ放電処理面に、前記調製した層A1形成用塗布液を、硬化後の膜厚が約3.0μmとなるようにバーコーターで塗工して層A1を形成した。得られた層A1に、上記作製した偏光板の偏光子側に貼合した後、ベルトコンベア付き紫外線照射装置(ランプは、フュージョンUVシステムズ社製 Dバルブを使用)を用いて、積算光量が750mJ/cm2となるように紫外線を照射し、層A1を硬化させ、円偏光板1を得た。
上記円偏光板1の作製において、λ/4位相差フィルムの種類、層Aの有無、層Aの塗布液の種類(下記参照)及び硬化条件(紫外線照射量、下記参照)を調整して、表1に記載の貯蔵弾性率に変更した以外は同様にして、円偏光板2~15を作製した。
上記円偏光板1の作製に用いた層A1の形成方法において、層A形成用塗布液の液組成及び層Aを硬化する際の紫外線の積算光量を下記の条件に変更した以外は同様にして、層A2を形成した。
3,4-エポキシシクロヘキシルメチル3,4-エポキシシクロヘキサンカルボキシレート 63質量部
エポリードGT-301(ダイセル化学社製脂環式エポキシ樹脂)
22質量部
1,4-ブタンジオールジグリシジルエーテル 15質量部
トリアリールスルホニウムヘキサフルオロホスフェート 2.40質量部
9,10-ジブトキシアントラセン 0.1質量部
1,4-ジエトキシナフタレン 2.0質量部
〈紫外線の照射条件〉
ベルトコンベア付き紫外線照射装置(ランプは、フュージョンUVシステムズ社製 Dバルブを使用)を用いて、積算光量が800mJ/cm2となるように紫外線を照射して硬化させ、層A2を形成した。
上記円偏光板1の作製に用いた層A1の形成方法において、層A形成用塗布液の液組成及び層Aを硬化する際の紫外線の積算光量を下記の条件に変更した以外は同様にして、層A3を形成した。
3,4-エポキシシクロヘキシルメチル3,4-エポキシシクロヘキサンカルボキシレート 57質量部
エポリードGT-301(ダイセル化学社製脂環式エポキシ樹脂)
28質量部
1,4-ブタンジオールジグリシジルエーテル 15質量部
トリアリールスルホニウムヘキサフルオロホスフェート 3.30質量部
9,10-ジブトキシアントラセン 0.1質量部
1,4-ジエトキシナフタレン 2.0質量部
〈紫外線の照射条件〉
ベルトコンベア付き紫外線照射装置(ランプは、フュージョンUVシステムズ社製 Dバルブを使用)を用いて、積算光量が1100mJ/cm2となるように紫外線を照射して硬化させ、層A3を形成した。
上記円偏光板1の作製に用いた層A1の形成方法において、層A形成用塗布液の液組成及び層Aを硬化する際の紫外線の積算光量を下記の条件に変更した以外は同様にして、層A4を形成した。
3,4-エポキシシクロヘキシルメチル3,4-エポキシシクロヘキサンカルボキシレート 50質量部
エポリードGT-301(ダイセル化学社製脂環式エポキシ樹脂)
35質量部
1,4-ブタンジオールジグリシジルエーテル 15質量部
トリアリールスルホニウムヘキサフルオロホスフェート 3.50質量部
9,10-ジブトキシアントラセン 0.1質量部
1,4-ジエトキシナフタレン 2.0質量部
〈紫外線の照射条件〉
ベルトコンベア付き紫外線照射装置(ランプは、フュージョンUVシステムズ社製 Dバルブを使用)を用いて、積算光量が1400mJ/cm2となるように紫外線を照射して硬化させ、層A4を形成した。
上記円偏光板1の作製に用いた層A1の形成方法において、層A形成用塗布液の液組成及び層Aを硬化する際の紫外線の積算光量を下記の条件に変更した以外は同様にして、層A5を形成した。
3,4-エポキシシクロヘキシルメチル3,4-エポキシシクロヘキサンカルボキシレート 25質量部
エポリードGT-301(ダイセル化学社製脂環式エポキシ樹脂)
60質量部
1,4-ブタンジオールジグリシジルエーテル 15質量部
トリアリールスルホニウムヘキサフルオロホスフェート 4.00質量部
9,10-ジブトキシアントラセン 0.1質量部
1,4-ジエトキシナフタレン 2.0質量部
〈紫外線の照射条件〉
ベルトコンベア付き紫外線照射装置(ランプは、フュージョンUVシステムズ社製 Dバルブを使用)を用いて、積算光量が1800mJ/cm2となるように紫外線を照射して硬化させ、層A5を形成した。
(層A6の形成条件:貯蔵弾性率=550MPa)
上記円偏光板1の作製に用いた層A1の形成方法において、層A形成用塗布液の液組成及び層Aを硬化する際の紫外線の積算光量を下記の条件に変更した以外は同様にして、層A6を形成した。
3,4-エポキシシクロヘキシルメチル3,4-エポキシシクロヘキサンカルボキシレート 18質量部
エポリードGT-301(ダイセル化学社製脂環式エポキシ樹脂)
67質量部
1,4-ブタンジオールジグリシジルエーテル 15質量部
トリアリールスルホニウムヘキサフルオロホスフェート 4.20質量部
9,10-ジブトキシアントラセン 0.1質量部
1,4-ジエトキシナフタレン 2.0質量部
〈紫外線の照射条件〉
ベルトコンベア付き紫外線照射装置(ランプは、フュージョンUVシステムズ社製 Dバルブを使用)を用いて、積算光量が1900mJ/cm2となるように紫外線を照射して硬化させ、層A6を形成した。
上記円偏光板10の作製において、保護フィルムと偏光子の間に層B1を形成した以外は同様にして、円偏光板16を作製した。
以下の各成分を混合した後、脱泡して、層B1形成用塗布液を調製した。なお、トリアリールスルホニウムヘキサフルオロホスフェートは、50%プロピレンカーボネート溶液として配合し、下記にはトリアリールスルホニウムヘキサフルオロホスフェートの固形分量を表示した。
3,4-エポキシシクロヘキシルメチル3,4-エポキシシクロヘキサンカルボキシレート 55質量部
エポリードGT-301(ダイセル化学社製脂環式エポキシ樹脂)
30質量部
1,4-ブタンジオールジグリシジルエーテル 15質量部
トリアリールスルホニウムヘキサフルオロホスフェート 3.50質量部
9,10-ジブトキシアントラセン 0.1質量部
1,4-ジエトキシナフタレン 2.0質量部
(円偏光板の作製)
λ/4位相差フィルム1及びKC4UA(コニカミノルタアドバンストレイヤー(株)製)の表面にコロナ放電処理を施した。次いで、λ/4位相差フィルム1のコロナ放電処理面に、前記円偏光板10の作製と同様にして、硬化後の膜厚が約3μmとなるように、前記層A3形成用塗布液をバーコーターで塗工し、次いで積算光量が1200mJ/cm2となるように紫外線を照射、硬化して層A3を形成した。得られた層A3に、上記作製した偏光板の偏光子側に貼合して、偏光板を作製した。また、KC4UAのコロナ放電処理面に、上記調製した層B1形成用塗布液を、硬化後の膜厚が約3μmとなるようにバーコーターで塗工し、積算光量が1200mJ/cm2となるように紫外線を照射、硬化して層B1を形成した。得られた層B1に、上記作製した偏光板の偏光子側に貼合して、円偏光板16を作製した。
上記円偏光板16の作製において、λ/4位相差フィルムの種類、層B形成用塗布液の種類及び硬化条件(下記参照)を調整して、表1に記載の貯蔵弾性率に変更した以外は同様にして、円偏光板17~20を作製した。
上記円偏光板16の作製に用いた層B1の形成方法において、層B形成用塗布液の液組成及び層Bを硬化する際の紫外線の積算光量を下記の条件に変更した以外は同様にして、層B2を形成した。
3,4-エポキシシクロヘキシルメチル3,4-エポキシシクロヘキサンカルボキシレート 60質量部
エポリードGT-301(ダイセル化学社製脂環式エポキシ樹脂)
25質量部
1,4-ブタンジオールジグリシジルエーテル 15質量部
トリアリールスルホニウムヘキサフルオロホスフェート 2.70質量部
9,10-ジブトキシアントラセン 0.1質量部
1,4-ジエトキシナフタレン 2.0質量部
〈紫外線の照射条件〉
ベルトコンベア付き紫外線照射装置(ランプは、フュージョンUVシステムズ社製 Dバルブを使用)を用いて、積算光量が900mJ/cm2となるように紫外線を照射して硬化させ、層B2を形成した。
上記円偏光板16の作製に用いた層B1の形成方法において、層B形成用塗布液の液組成及び層Bを硬化する際の紫外線の積算光量を下記の条件に変更した以外は同様にして、層B3を形成した。
3,4-エポキシシクロヘキシルメチル3,4-エポキシシクロヘキサンカルボキシレート 63質量部
エポリードGT-301(ダイセル化学社製脂環式エポキシ樹脂)
22質量部
1,4-ブタンジオールジグリシジルエーテル 15質量部
トリアリールスルホニウムヘキサフルオロホスフェート 2.40質量部
9,10-ジブトキシアントラセン 0.1質量部
1,4-ジエトキシナフタレン 2.0質量部
〈紫外線の照射条件〉
ベルトコンベア付き紫外線照射装置(ランプは、フュージョンUVシステムズ社製 Dバルブを使用)を用いて、積算光量が800mJ/cm2となるように紫外線を照射して硬化させ、層B3を形成した。
〔層A及び層Bの貯蔵弾性率の測定〕
上記各円偏光板の作製に用いた層A1~層A6、層B1~層B3のと同様の各塗布液を調製し、剥離フィルムとして、厚さ38μmのポリエチレンテレフタレート製剥離フィルム(リンテック社製 SP-PET3811)の剥離層上に、上記各円偏光板の作製と同一条件で塗布、乾燥及び紫外線照射を行った後、剥離フィルムより剥離して、各単膜を得た。
上記各層Aを有するλ/4位相差フィルム及び、保護フィルム又は層Bを有する保護フィルムについて下記の方法に従って、それぞれの寸法変化率を測定した。
保護フィルムの寸法変化率A=|{(Lp(80℃)-Lp(20℃))/Lp(20℃)}×100|(%)
次いで、λ/4位相差フィルム上に層Aを形成した試料についても、上記と同様の方法で、温度20℃、相対湿度55%に調湿された環境下で24時間調湿した後の基準寸法であるLq(20℃)と、温度80℃、相対湿度55%に調湿された環境下で24時間保管した後の距離Lq(80℃)を正確に測定し、下式(3)により、層Aを有するλ/4位相差フィルムの寸法変化率(絶対値)Bを測定した。
層Aを有するλ/4位相差フィルムの寸法変化率B=|{(Lq80℃)-Lq(20℃))/Lq(20℃)}×100|(%)
上記測定した保護フィルムの寸法変化率Aと、層Aを有するλ/4位相差フィルムの寸法変化率Bとの寸法変化率差を式(1)に従って求め、これを寸法変化率差C(%)とした。
得られた結果を、表1に示す。
上記円偏光板1~3、7~20の作製に用いた層A1形成用塗布液~層A6形成用塗布液を、それぞれ、剥離フィルムとして、厚さ38μmのポリエチレンテレフタレート製剥離フィルム(リンテック社製 SP-PET3811)の剥離層上に、硬化後の膜厚が約3μmとなるようにバーコーターで塗工し、次いで積算光量が1200mJ/cm2となるように紫外線を照射、硬化して各層Aを形成した。次いで、形成した層Aをポリエチレンテレフタレート製剥離フィルムより剥離して層Aの単膜を得た。
次いで、図7に示す構成からなる有機エレクトロルミネッセンス表示装置1~20を作製した。
図7に示すように、ガラスの透明基板1a上にクロムからなる反射電極、反射電極上に金属電極2a(陽極)としてITOを成膜し、陽極上に正孔輸送層としてポリ(3,4-エチレンジオキシチオフェン)-ポリスチレンスルホネート(PEDOT:PSS)をスパッタリング法で厚さ80nmで形成し、次いで正孔輸送層上にシャドーマスクを用いて、図7に示すようにRGBそれぞれの発光層3aR、3aG、3aBを100nmの膜厚で形成した。赤色発光層3aRとしては、ホストとしてトリス(8-ヒドロキシキノリナート)アルミニウム(Alq3)と発光性化合物[4-(dicyanomethylene)-2-methyl-6(p-dimethylaminostyryl)-4H-pyran](DCM)とを共蒸着(質量比99:1)して100nmの厚さで形成した。緑色発光層3aGとしては、ホストとしてAlq3と、発光性化合物クマリン6とを共蒸着(質量比99:1)して100nmの厚さで形成した。青色発光層3aBとしては、ホストとしてBAlqと発光性化合物Peryleneとを共蒸着(質量比90:10)して厚さ100nmで形成した。
上記作製した有機EL表示素子に、前記作製した偏光子及びλ/4位相差フィルムを搭載した各円偏光板1~20を、図7に記載の構成となるように、対向して接着層6aを介して固定化することにより、有機EL表示装置1~20を作製した。
〔視認性の評価〕
上記作製した各有機EL表示装置について、1)23℃、相対湿度55%の環境下で48時間保管した後、電圧を印加せず、発光させない状態で、有機EL表示装置の最表面から5cm高い位置での照度が1000Lxとなる条件Aと、2)40℃、相対湿度80%の環境下で48時間保管した後、電圧を印加せず、発光させない状態で、有機EL表示装置の最表面から5cm高い位置での照度が、1000Lxとなる条件Bとで、有機EL表示装置の画面の法線に対し40°の角度から視認性を目視確認し、下記の基準に従って、高温高湿環境下での視認性を評価した。
○:合計点数が24点以上、26点以下である
△:合計点数が18点以上、23点以下である
×:合計点数が17点以下である
〔耐久性の評価:強制劣化テスト〕
上記作製した各有機EL表示装置を、温度衝撃試験機を用い、乾燥環境下(相対湿度20%以下)で、20℃で10分間保管した後、50℃で10分間保管する操作(これを1サイクルとする)を1000サイクル行う強制劣化テストを行った後、温度衝撃試験機より取り出し、白色表示させた際の画像表示ムラを、強制劣化テストを施す前の白色表示画像と比較観察し、下記の基準に従って、耐久性を評価した。
○:強制劣化テスト後で、わずかに画像表示ムラが観察される
△:強制劣化テスト後で、やや画像表示ムラが観察される
×:強制劣化テスト後で、明らかな画像表示ムラが観察され、一部で発光しない画素の発生が認められる
〔パネル劣化耐性の評価〕
上記各有機EL表示装置1~20について、上記耐久性の評価と同様にして1000サイクルの強制劣化処理を施した。次いで、強制劣化処理を行っていない各有機EL表示装置に対する平面性(反り有無)を目視観察し、下記の基準に従って、パネル劣化耐性の評価を行った。
○:強制劣化処理を施した有機EL表示装置は、平面性に優れ、反りの発生はほぼ認められない
△:強制劣化処理を施した有機EL表示装置は、やや反りの発生は認められるが、実用上許容される品質である
×:強制劣化処理を施した有機EL表示装置では、強い反りの発生は認めら、実用上問題となる品質である
以上により得られた結果を、表1に示す。
5 長尺延伸フィルム
6 斜め延伸テンター
7-1 外側のフィルム把持手段の軌跡
7-2 内側のフィルム把持手段の軌跡
8-1 外側のフィルム把持開始点
8-2 内側のフィルム把持開始点
9-1 外側のフィルム把持終了点
9-2 内側のフィルム把持終了点
10-1 外側斜め延伸開始点
10-2 内側斜め延伸開始点
11-1 外側斜め延伸終了点
11-2 内側斜め延伸終了点
12-1 テンター入口側のガイドローラ
12-2 テンター出口側のガイドローラ
13 フィルムの延伸方向
14-1 斜め延伸前のフィルムの搬送方向
14-2 斜め延伸後のフィルムの搬送方向
16 フィルム繰り出し装置
17 搬送方向変更装置
18 巻き取り装置
19 製膜装置
Wo 斜め延伸前のフィルム幅手長さ
W 斜め延伸後のフィルム幅手長さ
101、1a 基板、透明基板
102、2a 金属電極
103 有機発光層
3aR 赤色発色層
3aG 緑色発色層
3aB 青色発色層
104、4a 透明電極
105、5a 絶縁層
106 封止層
6a 接着層
107 フィルム
108、7a λ/4位相差フィルム
109、8a 偏光子
110、9a 偏光板保護層
111 表面反射防止層
112 層A
113 層B
A 有機EL表示装置
10a、C 円偏光板
11a、B 有機EL表示素子
Claims (10)
- 視認側から、保護フィルム、偏光子、λ/4位相差フィルム及び有機エレクトロルミネッセンス素子をこの順に有する有機エレクトロルミネッセンス表示装置であって、該λ/4位相差フィルムの少なくとも一方の面が、貯蔵弾性率が100~500MPaの範囲内である層Aを有することを特徴とする有機エレクトロルミネッセンス表示装置。
- 前記保護フィルムと、前記層Aを有するλ/4位相差フィルムとの下記式(1)で規定する寸法変化率差C(%)が、0.1~10.0%の範囲内であることを特徴とする請求項1に記載の有機エレクトロルミネッセンス表示装置。
式(1)
寸法変化率差C=|{(Lp(80℃)-Lp(20℃))/Lp(20℃)}×100|-|{(Lq(80℃)-Lq(20℃))/Lq(20℃)}×100|(%)
(式中、Lp(20℃)は保護フィルム単層の20℃における基準寸法であり、Lp(80℃)は保護フィルム単層の該Lp(20℃)の80℃における寸法を表す。Lq(20℃)は層Aを有するλ/4位相差フィルムの20℃における基準寸法であり、Lq(80℃)は層Aを有するλ/4位相差フィルムの該Lq(20℃)の80℃における寸法を表す。) - 前記層Aが前記偏光子と前記λ/4位相差フィルムとの間に有し、かつ前記保護フィルムと前記偏光子との間に層Bを有し、該層Aの貯蔵弾性率を貯蔵弾性率Aとし、該層Bの貯蔵弾性率を貯蔵弾性率Bとしたとき、貯蔵弾性率A>貯蔵弾性率Bの関係を満たすことを特徴とする請求項1又は2に記載の有機エレクトロルミネッセンス表示装置。
- 前記層Aが、波長200~400nmの領域で、吸収極大値を有することを特徴とする請求項1から請求項3までのいずれか一項に記載の有機エレクトロルミネッセンス表示装置。
- 前記層Aが、紫外線硬化性樹脂を含有することを特徴とする請求項1から請求項4までのいずれか一項に記載の有機エレクトロルミネッセンス表示装置。
- 少なくとも保護フィルム、偏光子及びλ/4位相差フィルムをこの順に有する円偏光板であって、該λ/4位相差フィルムの少なくとも一方の面が、貯蔵弾性率が100~500MPaの範囲内である層Aを有することを特徴とする円偏光板。
- 前記保護フィルムと、前記層Aを有するλ/4位相差フィルムとの下記式(1)で規定する寸法変化率差C(%)が、0.1~10.0%の範囲内であることを特徴とする請求項6に記載の円偏光板。
式(1)
寸法変化率差C=|{(Lp(80℃)-Lp(20℃))/Lp(20℃)}×100|-|{(Lq(80℃)-Lq(20℃))/Lq(20℃)}×100|(%)
(式中、Lp(20℃)は保護フィルム単層の20℃における基準寸法であり、Lp(80℃)は保護フィルム単層の該Lp(20℃)の80℃における寸法を表す。Lq(20℃)は層Aを有するλ/4位相差フィルム単層の20℃における基準寸法であり、Lq(80℃)は層Aを有するλ/4位相差フィルム単層の該Lq(20℃)の80℃における寸法を表す。) - 前記層Aが前記偏光子と前記λ/4位相差フィルムとの間に有し、かつ前記保護フィルムと前記偏光子との間に層Bを有し、該層Aの貯蔵弾性率を貯蔵弾性率Aとし、該層Bの貯蔵弾性率を貯蔵弾性率Bとしたとき、貯蔵弾性率A>貯蔵弾性率Bの関係を満たすことを特徴とする請求項6又は請求項7に記載の円偏光板。
- 前記層Aが、波長200~400nmの領域で、吸収極大値を有することを特徴とする請求項6から請求項8までのいずれか一項に記載の円偏光板。
- 前記層Aが、紫外線硬化性樹脂を有することを特徴とする請求項6から請求項9までのいずれか一項に記載の円偏光板。
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Also Published As
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KR20140092361A (ko) | 2014-07-23 |
JPWO2013077220A1 (ja) | 2015-04-27 |
JP6256003B2 (ja) | 2018-01-10 |
US20140332786A1 (en) | 2014-11-13 |
US9064826B2 (en) | 2015-06-23 |
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