WO2013054692A1 - 有機エレクトロルミネッセンス画像表示装置 - Google Patents
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- WO2013054692A1 WO2013054692A1 PCT/JP2012/075483 JP2012075483W WO2013054692A1 WO 2013054692 A1 WO2013054692 A1 WO 2013054692A1 JP 2012075483 W JP2012075483 W JP 2012075483W WO 2013054692 A1 WO2013054692 A1 WO 2013054692A1
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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
- H10K59/80—Constructional details
- H10K59/8791—Arrangements for improving contrast, e.g. preventing reflection of ambient light
-
- 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
-
- 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
- H10K59/8793—Arrangements for polarized light emission
Definitions
- the present invention relates to an organic electroluminescence image display device, and more particularly to an organic electroluminescence image display device comprising a circularly polarizing plate having a ⁇ / 4 retardation film and an organic electroluminescence element.
- liquid crystal image display devices have a transparent substrate such as glass on both sides of the liquid crystal layer for the purpose of containing liquid crystal, and further retardation plates on both sides of the liquid crystal layer to compensate for light leakage.
- a polarizing plate having The polarizing plate has a problem that when the moisture is retained in the polarizer, the polarizer is deteriorated with time, and the displayed image looks reddish. This problem has been solved by using a cellulose acylate film having good water leakage, that is, high moisture permeability as a polarizing plate protective film.
- the durability of the display device was not a problem as long as the durability of the polarizer was rate-limiting and the polarizer was protected with the cellulose acylate film.
- An organic electroluminescence image display device forms a light emitting element (organic electroluminescence element) by laminating a metal electrode, an organic light emitting layer and a transparent electrode on a transparent substrate such as glass and polyimide.
- a configuration is adopted in which a circularly polarizing plate is used on the front surface of the element.
- the durability of the light-emitting element (organic electroluminescence element) is limited.
- a cellulose acylate film is used for the circularly polarizing plate of the organic electroluminescence image display device, the high moisture permeability property is adversely affected and the aging of the light emitter is caused.
- the current mobile uses a front plate and sealing glass, but there is a growing demand for thinner panels and cost reduction, especially for large screens where there is a desire to eliminate the front plate and sealing glass. In this case, the phosphor element is further deteriorated.
- Patent Document 1 and Patent Document 2 disclose a circularly polarizing plate using a ⁇ / 4 retardation film containing cellulose acylate, and also describe an organic electroluminescence image display device. However, none of them solves the deterioration problem of the light emitting element.
- the present invention has been made in view of the above problems, and the problem is that an organic electroluminescence image display in which reddish discoloration of a display image is improved and deterioration of a light emitting element is improved even in long-term use. Is to provide a device.
- an organic electroluminescence image display device including a circularly polarizing plate having at least a ⁇ / 4 retardation film and an organic electroluminescence element, provides the ⁇ / 4 retardation.
- Organic electroluminescence image display device in which the average value of the octanol / water partition coefficient (log P value) of the materials constituting the film is set within a specific range improves the reddish discoloration of the displayed image even over a long period of use.
- the present inventors have found that an organic electroluminescence image display device in which deterioration of a light emitting element is improved can be realized.
- an organic electroluminescence image display device comprising a circularly polarizing plate having at least a ⁇ / 4 retardation film and an organic electroluminescence element, an octanol / water partition coefficient (log P value) of a material constituting the ⁇ / 4 retardation film
- log P value octanol / water partition coefficient
- the ⁇ / 4 retardation film contains 70% by mass or more of cellulose acylate, the average value of the total acyl group substitution degree of the cellulose acylate is in the range of 1.00 to 3.00, and the number of carbon atoms 2.
- the ⁇ / 4 retardation film contains 70% by mass or more of cellulose acylate, the average value of the total acyl group substitution degree of the cellulose acylate is in the range of 1.00 to 3.00, and the number of carbon atoms 2.
- the ⁇ / 4 retardation film is 1) cellulose acylate A having a total acyl group substitution degree of 2.60 or less and a carbon number of 3 or more and an acyl group substitution degree of 1.00 or less, and 2) carbon number.
- the organic electroluminescence image display device according to any one of 1 to 3 above, further comprising cellulose acylate B having an acyl group substitution degree of 3 or more and an acyl group substitution degree of 1.50 or more.
- the ⁇ / 4 retardation film contains an aromatic compound having at least three aromatic rings in a range of 2.0 to 15.0% by mass with respect to the total mass of the cellulose acylate. 5.
- the organic electroluminescence image display device according to any one of 2 to 4.
- an organic electroluminescence image display device in which the reddish discoloration of the display image over time is improved and the deterioration of the light emitting element is improved.
- the cause of the deterioration of the phosphor with time was found not to be the moisture permeability of the cellulose acylate film itself used in the circularly polarizing plate, but to be derived from the fact that the protective film on the illuminant side retained moisture, and that was derived.
- the problem of the present invention can be solved by a method capable of maintaining the good water leakage of the film and suppressing the deterioration of the phosphor with the passage of time. .
- the moisture content of the cellulose acylate film is reduced while the moisture content of the film itself is reduced, and the durability of the polarizer is increased. It has been found that the deterioration of the light emitting element can be suppressed while keeping it.
- FIG. 2A Schematic diagram illustrating an example of the stretching direction in the oblique stretching tenter shown in FIG. 2A
- the organic electroluminescence image display device of the present invention is an organic electroluminescence image display device including a circularly polarizing plate having at least a ⁇ / 4 retardation film and an organic electroluminescence element, and constitutes the ⁇ / 4 retardation film.
- the average value of the octanol / water partition coefficient (log P value) of the material is in the range of ⁇ 3.00 to 4.00, and the luminous body without deteriorating the durability of the polarizer by such a configuration
- the present invention provides an organic EL image display device that eliminates deterioration of elements. This feature is a technical feature common to the inventions according to claims 1 to 6.
- the average value of the octanol / water partition coefficient (log P value) of the constituent material of the ⁇ / 4 retardation film is set within a predetermined range from the viewpoint that the effect of the present invention can be further expressed.
- the cellulose acylate contains at least 70% by mass, the average acyl substitution degree of the cellulose acylate is in the range of 1.00 to 3.00, and the acyl has 3 or more carbon atoms. It is a preferred embodiment that the average value of the degree of substitution of groups is in the range of 0.65 to 2.50.
- the cellulose acylate is contained in an amount of 70% by mass or more.
- the average value of the total acyl group substitution degree is in the range of 1.00 to 3.00, and the average value of the substitution degree of the acyl group having 3 or more carbon atoms is in the range of 0.90 to 2.50. Is a preferred embodiment.
- a ⁇ / 4 retardation film containing cellulose acylate having a specific acyl group substitution degree can be used to produce a ⁇ / 4 retardation film having an increased retardation.
- the ⁇ / 4 retardation film is 1) cellulose acylate A having a total acyl group substitution degree of 2.60 or less and an acyl group substitution degree of 3 or more carbon atoms of 1.00 or less. And 2) Cellulose acylate B having a carbon number of 3 or more and an acyl group substitution degree of 1.50 or more is preferable.
- the ⁇ / 4 retardation film contains an aromatic compound having at least three aromatic rings in a range of 2.0 to 15.0% by mass with respect to the total mass of the cellulose acylate. It is.
- hydrophobicity can be imparted without impairing the moisture permeability of the cellulose acylate film.
- the organic electroluminescence image display device it is preferable that there is no front plate and that the glass plate is composed of one or less because an organic EL image display device with a thin panel and low cost can be provided. .
- ⁇ is used to mean that the numerical values described before and after it are included as the lower limit value and the upper limit value.
- FIG. 1 is a schematic diagram showing an example of the configuration of an organic electroluminescence image display device (hereinafter also referred to as an organic EL image display device) of the present invention.
- a circularly polarizing plate C in which a polarizer 109 is sandwiched between a ⁇ / 4 retardation film 108 and a polarizing plate protective layer 110 is provided on an organic EL element B having a structure, and an organic EL image display device A is configured.
- the polarizing plate protective layer 110 may have a surface antireflection layer 111.
- the thickness of the organic EL element B is about 1 ⁇ m except for the transparent substrate 1.
- 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 or the like and a light emitting layer made of a fluorescent organic solid such as anthracene, Or 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 laminate of these hole injection layer, light-emitting layer, and electron injection layer.
- a laminate of various organic thin films for example, a laminate of a hole injection layer made of a triphenylamine derivative or the like and a light emitting layer made of a fluorescent organic solid such as anthracene, Or 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 laminate of these hole injection layer, light-emitting layer, and electron injection layer.
- 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 is reduced by the phosphor material. It emits light on the principle that it is excited and emits light when the excited fluorescent material returns 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.
- the organic EL image display device in order to extract light emitted from the organic light emitting layer, at least one of the electrodes must be transparent, and is usually a transparent electrode formed of a transparent conductor such as indium tin oxide (ITO). Is used as the anode.
- ITO indium tin oxide
- metal electrodes such as Mg—Ag and Al—Li are used.
- each layer constituting the organic light emitting layer is formed of an extremely thin film having a thickness in the range of 10 to 100 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 image display device looks like a mirror surface.
- the organic EL image display device of the present invention which includes an organic EL element having a transparent electrode on the front surface side of the 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
- a configuration is adopted in which a polarizing plate is provided on the surface side (viewing side) of the transparent electrode and a retardation plate is 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 mirror surface of the metal electrode can be completely shielded. it can.
- the external light incident on the organic EL image display device transmits only 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 phase difference plate is ⁇ / 4.
- the angle formed by the polarization direction of the polarizing plate and the retardation plate is ⁇ / 4, it is circularly polarized light.
- This circularly polarized light is transmitted through the transparent substrate, the transparent electrode, and the organic light emitting layer, is reflected by the metal electrode, is again transmitted through the organic light emitting layer, 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 ⁇ / 4 retardation film according to the present invention 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 preferably has an in-plane retardation value Ro (550) in the range of 100 to 180 nm measured at a wavelength of 550 nm under an environment of 23 ° C. and 55% RH. .
- the ⁇ / 4 retardation film referred to in the present invention gives a quarter wavelength retardation 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.
- reverse wavelength dispersion Ro (450) ⁇ Ro (550) ⁇
- a ⁇ / 4 retardation film having Ro (650) is preferable.
- Even in the case of positive wavelength dispersion it is possible to achieve ⁇ / 4 by laminating a ⁇ / 4 retardation film and a ⁇ / 2 plate, but in the case of adopting a laminated structure, the retardation in the thickness direction (Rth) increases. Visibility decreases due to misalignment and axis misalignment.
- the wavelength dispersion of the ⁇ / 4 retardation film has a ratio of Ro (450) / Ro (650) of less than 1.00, preferably 0.97 or less, more preferably 0.95 or less.
- ⁇ / 4 from green to red with high visual sensitivity
- the value of the ratio of Ro (550) / Ro (650) is preferably 0.98 or less, more preferably 0.96 or less, and further Preferred is 0.94 or less.
- the retardation value Ro (550) referred to in the present invention is a retardation value represented by the following formula (i).
- n x represents a refractive index in the slow axis direction x in the film plane.
- n y represents a refractive index in the y direction perpendicular to the x direction in the film plane.
- d represents the film thickness (nm) of the film.
- Each refractive index is a value measured at a measurement wavelength of 550 nm in an environment of 23 ° C. and 55% RH.
- the retardation value Ro (550) defined in the present invention can be measured using an automatic birefringence meter.
- an automatic birefringence meter KOBRA-21ADH manufactured by Oji Scientific Instruments
- the retardation value Ro (550) is obtained by measuring the birefringence at 550 nm in an environment of 23 ° C. and 55% RH. Can be calculated.
- 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 °”, a long circle with good productivity can be obtained by laminating and laminating a polarizer having a transmission axis or an absorption axis in a direction parallel to the longitudinal direction of the polarizing film. A polarizing film can be formed.
- the orientation angle ⁇ with respect to the longitudinal direction of the base film is preferably “substantially 45 °”.
- “substantially 45 °” means within a range of 35 to 55 ° from the longitudinal direction.
- 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 More preferably within the range of 47 °, most preferably within the range of 44 to 46 °.
- the circularly polarizing plate according to the present invention is composed of at least a polarizer and a ⁇ / 4 retardation film, and is used in an organic EL image display device to shield the specular reflection of a metal electrode constituting the organic EL element. Can do.
- the circularly polarizing plate according to the present invention is obliquely stretched so that the angle of the slow axis (that is, the orientation angle ⁇ ) is “substantially 45 °” with respect to the longitudinal direction, and is elongated obliquely. It is preferable that it is the elongate circularly-polarizing plate which bonded the (lambda) / 4 retardation film with the roll to roll.
- the circularly polarizing plate according to 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 contains an ultraviolet absorbing function, so that both the polarizer and the organic EL element can be protected from ultraviolet rays.
- the ⁇ / 4 retardation film on the light emitter side also has an ultraviolet absorbing function. If it is, it is preferable from a viewpoint which can suppress deterioration of an organic EL element more.
- the circularly polarizing plate according to the present invention uses a stretched polyvinyl alcohol doped with iodine or a dichroic dye as a polarizer, and is stuck in a configuration of ( ⁇ / 4 retardation film) / polarizer / protective film. Can be manufactured together. Details of the polarizer will be described later.
- the circularly polarizing plate according to 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 average value of the octanol / water partition coefficient (log P value) of the material constituting the ⁇ / 4 retardation film according to the present invention is in the range of ⁇ 3.00 to 4.00.
- the partition coefficient referred to in the present invention refers to an octanol / water partition coefficient (log P value), for example, Crippen's fragmentation method (J. Chem. Inf. Comput. Sci., 27, 21 (1987)). It can ask for.
- ⁇ / 4 retardation film according to the present invention needs to reduce water content while maintaining water leakage, that is, high moisture permeability. For that purpose, it is important to control the average logP value of the ⁇ / 4 retardation film according to the present invention within the range defined by the present invention. If the log P value is ⁇ 3.00 or more, a water content reducing effect can be exhibited, and if the log P value is 4.00 or less, the adhesiveness to the polarizer is improved and the polarizing plate can be easily produced. It becomes.
- the average logP value of the material constituting the ⁇ / 4 retardation film according to the present invention is in the range of ⁇ 3.00 to 4.00, preferably ⁇ 0.50 to 3.00. Within the range, more preferably within the range of 0.10 to 2.00.
- the octanol / water partition coefficient (log P value) can be measured by the flask immersion method described in JIS (Japanese Industrial Standards) Z 7260-107 (2000). Further, the octanol / water partition coefficient (log P value) can be estimated by a computational chemical method or an empirical method instead of the above-described actual measurement method.
- the above-mentioned Crippen's fragmentation method J. Chem. Inf. Comput. Sci., 27, 21 (1987)
- Viswanadhan's fragmentation method J. Chem. Inf. Comput. Sci.,). 29, 163 (1989).
- Broto's fragmentation method Eur. J. Med. Chem.-Chim. Theor., 19, 71 (1984).
- the Crippen's fragmentation method J. Chem. Inf. Comput. Sci., 27, 21 (1987).
- the log P value of the target compound differs depending on the measurement method or calculation method, it is preferable to determine whether or not the compound is within the scope of the present invention by the Crippen's fragmentation method, which is a calculation method.
- 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 and has a high retardation.
- the cellulose acylate is contained in an amount of 70% by mass or more, and the average value of the total acyl group substitution degree of the cellulose acylate is from the viewpoint that the stretching ratio can be kept low and failures such as breakage can be avoided. It is preferable to use a film having a range of 1.00 to 3.00.
- the average value of the substitution degree of acyl groups having 3 or more carbon atoms is 0. It is preferably within the range of 90 to 2.50.
- the total acyl group substitution degree is 2.60 or less, and the acyl group substitution degree having 3 or more carbon atoms is 1;
- the film preferably contains 0.000 or less of cellulose acylate A and 2) cellulose acylate B having 3 or more carbon atoms and an acyl group substitution degree of 1.50 or more.
- the method for measuring the degree of acyl group substitution defined in the present invention can be performed 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 0.65 to 2.50, more preferably in the range of 0.90 to 2.50, Preferably it is in the range of 1.00 to 2.00, particularly preferably in the range of 1.30 to 1.70.
- the film is hardly damaged by the alkali saponification treatment at the time of producing the circularly polarizing plate, and can function as a protective film.
- the upper limit of the total acyl group substitution degree of cellulose acylate is theoretically 3.0.
- the acyl group substitution degree of 3 or more carbon atoms of cellulose acylate is 0.65 or more
- the ⁇ / 4 retardation film can be provided with sufficient hydrophobicity, and the organic electroluminescence according to the present invention.
- An improvement effect on the durability of the element can be obtained.
- the substitution degree of the acyl group having 3 or more carbon atoms is 0.90 or more, the improvement effect becomes more remarkable.
- the degree of substitution with an acyl group having 3 or more carbon atoms is 2.50 or less, good adhesion with a polarizer can be maintained, and the production of a polarizing plate is facilitated.
- the acyl group having 3 or more carbon atoms is preferably a propionyl group.
- the number average molecular weight (Mn) of cellulose acylate is preferably in the range of 30000 to 300000 from the viewpoint of enhancing the mechanical strength of the resulting film. Furthermore, the range of 50,000 to 200,000 is preferable.
- the ratio of the weight average molecular weight (Mw) to the number average molecular weight (Mn) (Mw / Mn) of the cellulose acylate is preferably in the range of 1.4 to 3.0.
- the number average molecular weight (Mn) and the weight average molecular weight (Mw) of cellulose acetate can both be determined by measurement using gel permeation chromatography (GPC).
- the cellulose acylate according to the present invention can be obtained by acylating cellulose as a 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 performed using a basic compound such as an amine as the catalyst. (Acylation) is performed.
- the cellulose that is a raw material of cellulose acylate is not particularly limited, and examples thereof include cotton linter, wood pulp (for example, derived from coniferous trees, derived from broadleaf trees), kenaf and the like. Moreover, the cellulose acylate obtained from them can be mixed and used in arbitrary ratios, respectively.
- 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.
- 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 ⁇ / 4 retardation film according to the present invention is an aromatic compound having at least three aromatic rings as another means for adjusting the octanol / water partition coefficient (log P value) defined in the present invention to a desired value. Is contained within the range of 2.0 to 15.0% by mass with respect to the total mass of the cellulose acylate, the water content of the ⁇ / 4 retardation film can be reduced without impairing the moisture permeability of the cellulose acylate. It is preferable from the viewpoint that it can be reduced.
- 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 type or a polyester type, and the molecular weight is preferably in the range of 100 to 10,000, more 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.
- an aromatic compound having at least three aromatic rings in a range of 0.5 to 30 parts by mass with respect to 100 parts by mass of the ⁇ / 4 retardation film. It is more preferably within the range of 0 to 15 parts by mass.
- aromatic terminal ester compounds that can be applied to the present invention will be given below, but the present invention is not limited thereto.
- the polyhydric alcohol ester preferably used in the present invention is preferably composed of a divalent or higher aliphatic polyhydric alcohol and an ester of a monocarboxylic acid, and has a structure having 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.
- 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
- an alicyclic monocarboxylic acid or an aromatic monocarboxylic acid for the ⁇ / 4 retardation film according to the present invention 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 within the range of 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 particularly preferable.
- the molecular weight of the polyhydric alcohol ester is not particularly limited, but the molecular weight is preferably in the range of 300 to 1500, and more preferably in the range of 350 to 750.
- a larger molecular weight is preferable because it is less volatile, and a smaller one is preferable in terms of moisture permeability and compatibility with cellulose acetate.
- the carboxylic acid used in 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.
- polyhydric alcohol ester examples include, for example, paragraph numbers (0084) to (0087) of JP2011-008296A and paragraph numbers (0076) to (0080) of JP2011-013699A. And Exemplified compounds 1 to 35 described in paragraph numbers (0096) to (0099) of JP2011-053645A.
- the compound having a triazine ring that is preferable in the present invention is preferably a discotic compound because the retardation of the ⁇ / 4 retardation film can be expressed and the water content can be reduced.
- the molecular weight of the discotic compound 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.).
- Specific examples of the compound having a triazine ring that can be suitably used in the present invention include, for example, exemplified compounds TA1-1 to TA1 described in paragraph numbers (0089) to (0101) of JP2010-262209A.
- -50 Exemplified Compounds TA2-1 to TA2-9, Exemplified Compounds TA3-1 to TA3-12, Exemplified Compounds TA4-1 to TA4-10, or Paragraph Nos. (0157) to Exemplified compounds (1) to (445) described in (0179) and Exemplified compounds (MP-1) to (MP200) described in paragraph numbers (0186) to (0193) of the publication can be exemplified.
- the ⁇ / 4 retardation film according to the present invention or the protective film described later preferably contains an ultraviolet absorber.
- ultraviolet absorbers include benzotriazole ultraviolet absorbers and 2-hydroxybenzophenone series.
- ultraviolet absorbers and salicylic acid phenyl ester ultraviolet absorbers include benzotriazole ultraviolet absorbers and 2-hydroxybenzophenone series.
- 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 with a molecular weight of 400 or more are difficult to volatilize at high boiling points and are difficult to disperse even during high temperature molding, so that the weather resistance can be effectively improved with a relatively small amount of addition. Can do.
- 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, 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 manufactured by BASF Japan Ltd.
- BASF Japan Ltd. a product that uses TINUVIN to absorb a UV absorber.
- TINUVIN such as TINUVIN 109, TINUVIN 171, TINUVIN 234, TINUVIN 326, TINUVIN 327, TINUVIN 328, and TINUVIN 928 manufactured by BASF Japan Ltd.
- antioxidants can also be added to the ⁇ / 4 retardation film from the viewpoint of suppressing thermal decomposition and thermal coloring during molding. It is also possible to impart an antistatic function to the ⁇ / 4 retardation film using an antistatic agent.
- 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 includes, for example, silicon dioxide, titanium dioxide, aluminum oxide, zirconium oxide, calcium carbonate, kaolin, talc, calcined calcium silicate, water from the viewpoint of improving handling properties. It is preferable to contain matting agents such as inorganic fine particles such as Japanese calcium silicate, aluminum silicate, magnesium silicate, and calcium phosphate, and crosslinked polymer particles. Of these, silicon dioxide is preferably used in that the haze of the film can be kept low.
- the primary average particle diameter of these 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. From such a viewpoint, the tension softening point of the ⁇ / 4 retardation film is 105.
- the temperature is preferably in the range of ⁇ 145 ° C. in order to exhibit sufficient heat resistance, and is particularly preferably in the range of 110 ° C. to 130 ° C.
- a sample film was cut into a size of 120 mm (length) ⁇ 10 mm (width) using a Tensilon tester (ORIENTEC, RTC-1225A). After that, while sandwiching both ends, the temperature was increased at a rate of 30 ° C./min while pulling with a tension of 10 N, and the temperature when the tension reached 9 N was measured three times, and the average value was taken as the tension softening point. Can be sought.
- the dimensional change rate (%) of the ⁇ / 4 retardation film is preferably less than 0.5%, and more preferably less than 0.3%.
- ⁇ / 4 retardation film according to the present invention preferably has few defects in the film.
- the defect here refers to a void in the film (foaming defect) generated due to rapid evaporation of the solvent in the drying process of the solution casting, a foreign substance (insoluble matter) in the film forming stock solution, or film formation. This refers to foreign matter (foreign matter defect) in the film caused by dust, dust, etc. mixed in from outside air.
- a defect having a diameter of 5 ⁇ m or more is 1 piece / 10 cm square or less in the film film plane. More preferably, it is 0.5 piece / 10 cm square or less, and particularly preferably 0.1 piece / 10 cm square or less.
- the diameter of the 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 is the maximum diameter (diameter of circumscribed circle).
- the range of defects is determined by the size of the shadow when the defects are observed with the transmitted light of a differential interference microscope when the defects are bubbles or foreign objects. If the defect is a change in surface shape, such as transfer of a roller scratch or an abrasion, the size of the defect is confirmed by observing the defect with reflected light from a differential interference microscope.
- the polymer solution is filtered with high precision immediately before casting, or the degree of cleanness around the casting machine is increased. In addition, it is effective to set drying conditions after casting stepwise, and to dry efficiently while suppressing foaming.
- the number of defects is 1/10 cm square or less, for example, even when tension is applied to the film during processing in the subsequent process, the probability that the film breaks based on the defects is reduced and stable. Productivity can be obtained. Moreover, if the diameter of a fault is 5 micrometers or less, it will not be visually confirmed by polarizing plate observation etc., but when it uses as an optical member, generation
- 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%.
- it is necessary not to introduce an additive or a copolymer component that absorbs visible light, or to remove foreign matters (insoluble matter) in the polymer. It is effective to remove by high-precision filtration to reduce the diffusion and absorption of light inside the film.
- reduce the surface roughness of the film contact area during film formation for example, cooling roller, calendar roller, drum, belt, coating substrate in solution film formation, transport roller, etc.
- Examples of the film forming method of the ⁇ / 4 retardation film according to the present invention include conventionally known film forming methods such as an inflation method, a T-die method, a calendar method, a cutting method, a casting method, an emulsion method, and a hot press method. The 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.
- melt casting from the viewpoint of suppressing the residual solvent used for dissolving cellulose acylate, a method of producing by melt casting is also preferable.
- the 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.
- the melt extrusion method is preferable from the viewpoint of obtaining a film having excellent mechanical strength and surface accuracy.
- the solution casting method is a step of preparing a dope by dissolving a resin or an additive in an organic solvent, a step of casting the dope on a belt-shaped or drum-shaped metal support, and drying the cast dope as a web. It is performed by the process of carrying out, the process of peeling a web from a metal support body, the process of extending
- Organic solvent useful for preparing the dope by dissolving the various constituent materials by the solution casting method of the ⁇ / 4 retardation film according to the present invention is one that simultaneously dissolves cellulose acylate and other additives. If there is, it can be used without any particular limitation.
- chlorinated organic solvent examples include methylene chloride.
- non-chlorinated organic solvent examples include 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 Among them, among them, methylene chloride, methyl acetate, ethyl acetate or 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.
- a non-chlorine organic solvent system is used. It also has a role of promoting dissolution of cellulose acylate.
- a dope composition dissolved in a mass% range is preferred.
- 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 preferable from the viewpoint of improving the stability of the dope, having a relatively low boiling point, and 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 that achieves 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 as the metal support, a stainless steel belt or a drum made of a casting and having its surface plated is preferably used.
- the cast width can be in the range of 1-4m.
- the surface temperature of the metal support in the casting step is appropriately set within a range from ⁇ 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, a method of bringing hot water into contact with the back side of the metal support, and the like.
- the method using hot water is preferable because the heat transfer is performed efficiently, and the time until the temperature of the metal support becomes constant is short.
- warm air considering the temperature drop of the web due to the latent heat of vaporization of the organic solvent, use warm air that is higher than the boiling point of the organic solvent, while preventing foaming and blowing air at a temperature higher than the desired temperature. May be used.
- a method of efficiently drying by changing the temperature of the support and the temperature of the drying air during the period from casting to peeling is preferable.
- 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%. Within the range of ⁇ 40% by mass or within the range of 60 to 130% by mass, particularly preferably within the range of 20 to 30% by mass or within the range of 70 to 120% by mass.
- the amount of residual solvent as used in the present invention is defined by the following equation.
- Residual solvent amount (% by mass) ⁇ (MN) / N ⁇ ⁇ 100
- M represents the mass of a sample collected during or after the production of the web or film
- N represents heating after removing the solvent in the film by heating M at 115 ° C. for 1 hour. Represents the mass of.
- the web is peeled off from the metal support and further dried to make the residual solvent amount 1.0% by mass or less, more preferably 0.1% by mass. % Or less, and particularly preferably 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 upper and lower rollers) or a tenter method for drying while transporting the web is employed.
- the ⁇ / 4 retardation film according to the present invention preferably has an in-plane retardation value Ro (550) in the range of 100 to 180 nm when measured at a wavelength of 550 nm.
- the retardation value Ro is preferably given by a film stretching process.
- the stretching method for example, a method in which a circumferential speed difference is given to a plurality of rollers, a method of stretching in the longitudinal direction using the roller circumferential speed difference therebetween, and both ends of the web are fixed with clips or pins, Examples include a method of extending the distance between the clips and pins in the traveling direction and extending in the vertical direction, a method of expanding the same in the horizontal direction and extending in the horizontal direction, and a method of extending both the vertical and horizontal directions and extending in both the vertical and horizontal directions. 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.
- stretching is performed in the transport direction (also referred to as MD direction) using a difference in peripheral speed of the film transport roller, or a direction orthogonal to the transport direction (width direction or TD direction).
- MD direction transport direction
- TD direction width direction
- the web is stretched by a tenter system in which both ends of the web are gripped with clips or the like, and the web gripping length (distance from the start of gripping to the end of gripping) can be independently controlled by the left and right grip means. It is also preferable to stretch using.
- stretching in the direction of 45 ° with respect to the film conveying direction can efficiently produce the ⁇ / 4 retardation film. preferable.
- a roll-shaped polarizing film having a transmission axis in a direction parallel to the longitudinal direction of the slow axis and a ⁇ / 4 retardation film having an orientation angle of substantially 45 ° are aligned in the longitudinal direction.
- an obliquely stretched tenter as a method of imparting an oblique orientation to a long film original film subjected to stretching.
- 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, And it is a film stretching apparatus which can control film thickness and retardation value with high precision.
- FIGS. 2A and 2B 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 long film original 4 whose direction is controlled by the guide roller 12-1 on the tenter entrance side has an outer film grip start point 8-1 and an inner film grip start. It is carried by a gripping tool (also referred to as a clip gripping portion) at the point 8-2, and is indicated by a locus 7-1 of the outer film holding means and a locus 7-2 of the inner film holding means by the obliquely stretched 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 gripping end point 9-1 and the inner film gripping end point 9-2, and the transport 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. 2B shows another tenter structure capable of oblique stretching, and the stretching can be performed in the same manner as the tenter structure capable of oblique stretching shown in FIG. 2A.
- 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 a device 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 a heating environment such as 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.
- the two ends of the film 4 fed out from the film roll and sequentially supplied at the film grip start points 8-1 and 8-2 at the entrance of the tenter are gripped by grippers, the film is guided into the oven, and the exit of the tenter
- the film is released from the gripping tool at the film gripping end points 9-1 and 9-2.
- the film 5 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 an asymmetric shape on the left and right, depending on the orientation angle ⁇ , the stretch ratio, etc. given to the long stretched film to be manufactured. It can be fine-tuned automatically.
- a long 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.
- 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 1.0% or less of the travel speed, preferably 0.5% or less, more preferably 0.1% or less. This is because if there is a difference in the traveling speed on the left and right of the film at the exit of the stretching process, wrinkles and shifts at the exit of the stretching process occur, so the speed difference between the left and right 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.
- 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 inlet of the long film is changed to a direction different from the traveling direction at the feeding angle ⁇ i in the tenter and conveyed. 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. It is set in the range of ⁇ 50 °.
- 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.
- 3A and 3B are schematic diagrams showing the stretching direction in the oblique stretching tenter shown in FIGS. 2A and 2B described above.
- both ends of the transport film are gripped by the gripping tool for the first time, that is, from the grip start points A1 and A1 to be drawn 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 a travel distance from the grip start point A1 to the grip end point Ay on the large-turn side tenter rail
- LB is a grip start point on the small-turn side tenter rail locus.
- is the difference in the distance that the left and right grippers travel on the tenter rail at the grip end point.
- Wo is the linear distance from the 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 the 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, more preferably in the range of 1.5 to 2.5.
- the draw ratio is within this range, thickness unevenness in the width direction is reduced, which is preferable.
- 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 gripped 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 in which the distance between the gripping tools gripping both ends of the film is maintained at a constant interval at the oven inlet.
- the transverse stretching zone refers to a section from when the gap between the gripping tools that grips 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. This refers to the interval until the beginning.
- the holding zone refers to a section in which the gripping tools at both ends run parallel to each other in 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 cellulose acylate 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.
- each zone is the glass transition temperature Tg of cellulose acylate
- the temperature of the preheating zone is in the range of Tg to Tg + 30 ° C.
- the temperature of the stretching zone is in the range of Tg to Tg + 30 ° C.
- the temperature of the cooling zone is Tg ⁇ It is preferably set within the range of 30 to Tg ° C.
- the glass transition temperature here is a midpoint glass measured according to JIS K7121 (1987) using a differential scanning calorimeter (DSC-7, manufactured by Perkin Elmer) at a heating rate of 20 ° C./min. Transition temperature (Tmg).
- 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 by 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.
- Known materials can be used for the roller.
- it is preferable to reduce the weight such as a method of applying a ceramic coating or a method of applying a chrome plating to a light metal surface such as aluminum. It is.
- This roller is provided to stabilize the track when the film travels.
- one of the rollers on the upstream side of these rollers is nipped by pressing a rubber roller against the film surface.
- a nip roller By setting it as such a nip roller, it becomes possible to suppress the fluctuation
- a pair of bearings 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. It has been.
- a film tension detection device for example, a load cell can be used.
- the 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 cell is installed on the left and right bearings of the guide roller closest to the entrance of the obliquely stretched tenter, so that the force of the running film on the roller, that is, the tension in the film traveling direction that is generated near both side edges of the film Are detected independently on the left and right.
- a strain gauge may be directly attached to the support that constitutes the roller bearing portion, and the load, that is, the film tension may be 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, and the tension near the both side edges of the film is detected by the guide roller closest to the entrance of the oblique stretching tenter.
- the tension near the side edges of the film in the guide roller closest to the entrance of the obliquely stretched tenter is detected by the guide roller closest to the entrance of the oblique stretching tenter.
- the degree of deviation is determined by detecting this tension difference. If the relationship between the position and direction of the film and the position and direction of the inlet of the film stretching apparatus is appropriate, the load acting on the rollers will be approximately equal on the left and right, and if the positions are misaligned, There is a difference in film tension.
- the film transport direction is changed in order to guide the formed film to the oblique stretching tenter inlet, or the film exiting from the oblique stretching tenter outlet is returned to the winding device direction.
- a method of changing the 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. 4A, FIG. 4B and FIG. 4C are examples of the manufacturing method according to the embodiment of the present invention, and are schematic diagrams illustrating an example in which an oblique stretching process is performed after being fed out from a long film original fabric roll.
- FIG. 5A and FIG. 5B are an example of the manufacturing method which concerns on embodiment of this invention, and after forming a film with a film forming apparatus, without winding up a long film original fabric, it is an example which performs an oblique stretch process continuously FIG.
- FIGS. 5A and 5B each show a long film original.
- reflective is shown.
- 16 is a film feeding device
- 17 is a transport direction changing device
- 18 is a winding device
- 19 is a film forming device.
- the film feeding device 16 is slidable and pivotable so that the film can be fed at a predetermined angle with respect to the obliquely stretched tenter inlet, or the film feeding device 16 is slidable.
- the transport direction changing device 17 can feed the film to the entrance of the obliquely stretched tenter.
- FIGS. 5A and 5B are the same as in FIGS. 4A and 4C described above, except that the film forming apparatus 19 is used instead of the film feeding apparatus 16 provided with the long film raw roll, and the film forming apparatus 19 continuously forms the film.
- the pattern which performs diagonally extending process is shown.
- 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 is 100 N / m or less, sagging and wrinkles of the film are easily generated, and the retardation and the profile in the width direction of the orientation axis are also deteriorated.
- the take-up tension is 300 N / m or more, the variation in the orientation angle in the width direction is deteriorated, and the width yield (taking efficiency in the width direction) is deteriorated.
- the fluctuation of the take-up tension T it is necessary to control the fluctuation of the take-up tension T with an accuracy of less than ⁇ 5.0%, preferably less than ⁇ 3.0%. If the fluctuation of the take-up tension T is ⁇ 5.0% or less, variations in the 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. Examples include 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 held by the gripper, and is sequentially wound on a winding core (winding roller) to form a rolled laminate of stretched films.
- both ends of the film held by the tenter holding tool may be trimmed before being wound on the winding roller.
- the masking film before winding, for the purpose of preventing blocking between the films, the masking film may be overlapped and wound up at the same time, or at least one of the stretched films, preferably wound up with tape or the like attached to both ends. Also good.
- 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 orientation angle ⁇ of the ⁇ / 4 retardation film obtained by the above production method is inclined in the range of, for example, 10 to 80 ° with respect to the winding direction, and in the width direction of at least 1300 mm,
- the variation in the in-plane retardation value Ro is preferably 4 nm or less, and the variation in the orientation angle ⁇ is preferably 1.0 ° or less.
- the variation in the in-plane retardation value Ro of the ⁇ / 4 retardation film is 4 nm or less, preferably 3 nm or less, at least 1300 mm in the width direction.
- the variation in the orientation angle ⁇ of the ⁇ / 4 retardation film is 1.0 ° or less, preferably 0.80 ° or less, in at least 1300 mm in the width direction. If the variation in the orientation angle ⁇ is 1.0 ° or less, a stretched film is bonded to a polarizer to produce a circularly polarizing plate, and even if it is installed in a liquid crystal display device, no light leakage occurs and the contrast is reduced. A decrease can also be prevented.
- the optimum value of the in-plane retardation value Ro of the ⁇ / 4 retardation film according to the present invention is selected depending on the design of the display device used.
- the in-plane retardation value Ro is the difference between the refractive index nx in the in-plane slow axis direction and the refractive index ny in the direction perpendicular to the slow axis in the plane, as described above.
- the multiplied value (Ro (nx ⁇ ny) ⁇ d).
- the average thickness of the ⁇ / 4 retardation film according to the present invention is preferably in the range of 20 to 80 ⁇ m, more preferably in the range of 30 to 60 ⁇ m, and particularly preferably 30 from the viewpoint of mechanical strength and the like. Within the range of ⁇ 40 ⁇ m.
- the thickness unevenness in the width direction affects whether or not winding is possible, and is preferably 3.0 ⁇ m or less, and more preferably 2.0 ⁇ m or less.
- the ⁇ / 4 retardation film according to the present invention may be formed by a melt film forming method.
- a composition also referred to as a dope
- an additive such as a resin and a plasticizer
- a melt containing fluid cellulose acylate is cast. It is a method to do.
- 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.
- the plurality of raw materials used for melt extrusion are usually preferably kneaded and pelletized in advance.
- Pelletization may be performed by a known method. For example, dry cellulose acylate, plasticizer, and other additives are fed to an extruder using a feeder and kneaded using a single or twin screw extruder, and then formed into a strand from a die. Can be extruded, water-cooled or air-cooled, and then 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 fine 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 that the shearing force is suppressed and the resin does not deteriorate (for example, molecular weight reduction, coloring, gel formation, etc.).
- a method of rotating in the same direction using a deep groove type screw is preferable. From the kneading uniformity, the meshing type is preferable.
- Film formation is performed using the pellets obtained as described above.
- the raw material powder can be supplied as it is to the extruder with a feeder and formed into a film without being pelletized.
- the melting temperature when extruding the above pellets using a single-screw or twin-screw type extruder is in the range of 200 to 300 ° C.
- T The film is cast from a die into a film, and the film is nipped between a cooling roller and an 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.
- the stainless steel fiber sintered filter is a united stainless steel fiber body that is intricately intertwined and compressed, and the contact points are sintered and integrated. The density of the fiber is changed depending on the thickness of the fiber and the amount of compression, and the filtration accuracy is improved. Can be adjusted.
- additives such as plasticizers and fine 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 when the film is nipped between the cooling roller and the elastic touch roller is preferably in the range of Tg to Tg + 110 ° C. of the film.
- Tg the film temperature on the touch roller side when the film is nipped between the cooling roller and the elastic touch roller.
- a well-known roller can be used.
- the elastic touch roller is also called a pinching rotary body.
- a commercially available elastic touch roller can also be used.
- the film obtained as described above passes through the step of contacting the cooling roller, and is then stretched by the stretching operation similar to the solution casting method.
- the knurling method can process a metal ring having an uneven pattern on its side surface by heating or pressing. Note that the gripping portions of the clips at both ends of the film are usually cut out and reused after collection because the film is deformed and cannot be used as a product.
- the film thickness of the ⁇ / 4 retardation film according to the present invention is not particularly limited, but is used within a range of 10 to 250 ⁇ m. Further, the film thickness is preferably in the range of 10 to 100 ⁇ m, particularly preferably in the range of 30 to 60 ⁇ m.
- the ⁇ / 4 retardation film according to the present invention has a width in the range of 1.0 to 4.0 m. Further, those having a width in the range of 1.4 to 4.0 m are preferably used, and particularly preferably in the range of 1.6 to 3.0 m. If the width is 4.0 m or less, stable conveyance can be performed.
- the arithmetic average roughness Ra of the surface of the ⁇ / 4 retardation film according to the present invention is preferably in the range of 2.0 to 4.0 nm, more preferably in the range of 2.5 to 3.5 nm. is there.
- the polarizing plate protective layer (10 described in FIG. 1) is preferably a protective film, and examples of the constituent material include a triacetyl cellulose film, a cellulose acetate propionate film, a cellulose diacetate film, Cellulose ester films such as cellulose acetate butyrate film, polyester films such as polyethylene terephthalate and polyethylene naphthalate, polycarbonate films, polyarylate films, polysulfone (including polyethersulfone) films, polyethylene films, polypropylene films, Cellophane, polyvinylidene chloride film, polyvinyl alcohol film, ethylene vinyl alcohol film, syndiotactic polystyrene film , Norbornene resin film, polymethylpentene film, polyetherketone film, polyetherketoneimide film, polyamide film, fluororesin film, nylon film, cycloolefin polymer film, polymethylmethacrylate film, acrylic film, etc
- cellulose ester films for example, Konica Minolta TK KC8UX, KC4UX, KC5UX, KC8UCR3, KC8UCR4, KC8UCR5, KC8UY, KC4UE, KC4UE, and KC12UR (above, manufactured by Konica Minolta Advanced Layer Co., Ltd.)
- a cycloolefin polymer film and a polyester film are preferable, and in the present invention, 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 the polarizer has an effect on improving the quality of the display image. It is also preferable to use the ⁇ / 4 retardation film according to the present invention as the film.
- the direction of 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 in the plane of the ⁇ / 4 retardation film.
- the protective film for the circularly polarizing plate is coated with a surface antireflection layer (11 shown in FIG. 1, hereinafter also referred to as an antireflection layer) directly or through another layer, and has an external light antireflection function. Giving is also a preferred embodiment.
- the antireflection layer is preferably laminated in consideration of the refractive index, the film thickness, the number of constituent layers, the layer order, and the like so that the reflectance is reduced by optical interference.
- the antireflection layer is preferably composed of a 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. Particularly preferably, it is an antireflection layer 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 (high refractive index layers having a higher refractive index than the support).
- an antireflection layer unit composed 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.
- the configuration of the antireflection layer the following configuration is conceivable, but is not limited thereto.
- the low refractive index layer is an essential constituent and preferably contains silica-based fine particles, and the refractive index is lower than the refractive index of the base film as a support, 23 ° C., 55%. It is preferably in the range of 1.30 to 1.45 when measured at a wavelength of 550 nm under an RH environment.
- 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 composition for forming a low refractive index layer preferably contains at least one kind of particles having an outer shell layer and porous or hollow inside as silica-based fine particles.
- the particles having the outer shell layer and having a porous or hollow inside are preferably hollow silica-based fine particles.
- composition for forming a low refractive index layer may contain an organosilicon compound represented by the following general formula (OSi), a hydrolyzate thereof, or a polycondensate thereof.
- OSi organosilicon compound represented by the following general formula (OSi)
- hydrolyzate thereof a hydrolyzate thereof
- polycondensate thereof a polycondensate thereof.
- organosilicon compound represented by the general formula (OSi) R represents an alkyl group having 1 to 4 carbon atoms.
- organosilicon compound represented by the general formula (OSi) 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 to the composition for forming a low refractive index layer.
- the refractive index of the high refractive index layer is preferably adjusted to the range of 1.4 to 2.2 when measured under conditions of a wavelength of 550 nm in an environment of 23 ° C. and 55% RH.
- the thickness of the high refractive index layer is preferably in the range of 5 nm to 1 ⁇ m, more preferably in the range of 10 to 200 nm, and most preferably in the range of 30 to 100 nm.
- the means for adjusting the refractive index can be achieved by adding metal oxide fine particles and the like.
- the metal oxide fine particles used preferably have a refractive index in the range of 1.80 to 2.60, more preferably in the range of 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
- a metal oxide having at least one metal element selected from Al, Mg, Si, P and S can be used. These metal oxide fine particles have a particle surface of Al, In, Sn, Sb. , Nb, halogen elements, Ta and the like may be doped, or a mixture thereof.
- the average particle diameter of the 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. Moreover, you may measure by the particle size distribution measuring apparatus etc. which utilize a dynamic light scattering method, a static light scattering method, etc. When the average particle size is 10 nm or more, aggregation is difficult and dispersion stability is improved. 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 metal oxide fine particles may be subjected to a surface treatment 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 the aggregation and sedimentation of particles over time are suppressed. You can also.
- the surface modification amount by a preferable organic compound is in the range of 0.1 to 5.0% by mass, more preferably in the range of 0.5 to 3.0% by mass with respect to the metal oxide fine particles. .
- organic compound used for the surface treatment examples include polyols, alkanolamines, stearic acid, silane coupling agents, and titanate coupling agents. Among these, a silane coupling agent is preferable. Two or more surface treatment agents 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 preferred.
- a ⁇ -conjugated conductive polymer can provide sufficient conductivity and solubility in a binder resin even when it is not substituted.
- an alkyl group, a carboxy group, a sulfo group for example, an alkyl group, a carboxy group, a sulfo group.
- a functional group such as a group, an alkoxy group, a hydroxy group, or a cyano group may be introduced.
- 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, and the like.
- examples thereof include compounds composed of fluorine-based anions such as 2 ⁇ , (CF 3 SO 2 ) 2 N ⁇ , and CF 3 CO 2 — .
- the ratio of the polymer to the binder is preferably in the range of 10 to 400 parts by weight of the binder with respect to 100 parts by weight of the polymer, and particularly preferably in the range of 100 to 200 parts by weight of the binder with respect to 100 parts by weight of the polymer. Is within.
- 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 1.0 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, if necessary, the polyvinyl alcohol film may be immersed in water and washed before dyeing.
- Stretching may be performed after dyeing with iodine, or may be performed while dyeing. Further, it 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.
- the organic EL element B includes, for example, a metal electrode 102, an organic light emitting layer 103, and a transparent electrode (ITO) 104 on a substrate 101 made of glass, polyimide, or the like.
- the organic light emitting layer 103 includes, for example, a hole injection layer, a hole transport layer, a light emitting layer, and The electron transport layer is laminated.
- the substrate 101 that can be used in the organic EL image display apparatus A shown in FIG. 1 is not particularly limited in type, such as glass and plastic, and may be transparent or opaque. When light is extracted from the substrate 101 side, the substrate 101 is preferably transparent. Examples of the transparent substrate preferably used include glass, quartz, and a transparent resin film.
- resin film When a resin film is used as the substrate 101, examples of applicable resin films include polyesters such as polyethylene terephthalate (PET) and polyethylene naphthalate (PEN), polyethylene, polypropylene, cellophane, cellulose diacetate, and cellulose triacetate (TAC).
- PET polyethylene terephthalate
- PEN polyethylene naphthalate
- TAC cellulose triacetate
- cellulose esters such as cellulose acetate phthalate, cellulose nitrate, or derivatives thereof, polyvinylidene chloride, polyvinyl alcohol, polyethylene vinyl alcohol, syndiotactic polystyrene, polycarbonate , Norbornene resin, polymethylpentene, polyetherketone, polyimide, polyethersulfone PES), polyphenylene sulfide, polysulfones, polyether imide, polyether ketone imide, polyamide, fluororesin, nylon, polymethyl methacrylate, acrylic or polyarylate, Arton (trade name, manufactured by JSR) or Apel (trade name, Mitsui Chemicals) And cycloolefin-based resins.
- CAP Cellulose acetate butyrate
- cellulose esters such as cellulose acetate phthalate, cellulose nitrate, or derivatives thereof, polyvinylidene chloride, polyvinyl alcohol, poly
- Water vapor permeability 25 ⁇ 0.5 ° C., measured by a method according to JIS K 7129-1992
- Relative humidity (90 ⁇ 2)% RH) is preferably a barrier film of 0.01 g / (m 2 ⁇ 24 h ⁇ atm) or less, and further measured by a method according to JIS K 7126-1987.
- the material for forming the barrier film may be any material that has a function of suppressing the intrusion of water or oxygen that causes deterioration of the organic EL element.
- silicon oxide, silicon dioxide, silicon nitride, or the like can be used.
- the method for forming the barrier film is not particularly limited.
- a polymerization method, a plasma CVD method, a laser CVD method, a thermal CVD method, a coating method, or the like can be used, but it is described in JP-A-2004-68143 from the viewpoint that a precise barrier film can be stably formed. It is particularly preferable to use an atmospheric pressure plasma polymerization method as described above.
- the opaque substrate examples include a metal plate such as aluminum and stainless steel, an opaque resin substrate, and a ceramic substrate.
- a glass plate As the substrate 101, a glass plate is preferably used from the viewpoint of preventing warpage of the organic electroluminescence display device.
- the thickness of the glass plate applicable to the present invention is preferably in the range of 0.1 to 10 mm. If it is 0.1 mm or more, it is excellent in durability, does not break due to a weak impact during transportation or use, does not warp even when heated, and does not deteriorate visibility due to cracking. Moreover, if it is 10 mm or less, an organic electroluminescent display apparatus can be reduced in weight and manufacturing cost can also be suppressed.
- the metal electrode (also referred to as an anode) 102 has a high work function from a vacuum level as an electrode material for efficiently injecting holes, 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) alloys, ITO (indium tin oxide), InZnO (indium zinc oxide), alloys of zinc oxide (ZnO) and aluminum (Al), and oxides of these metals and alloys alone or It can be used in a mixed state.
- holes 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
- 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 improves 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.
- examples of the second layer include a layer made of at least one of an oxide of an aluminum alloy, an oxide of molybdenum, an oxide of zirconium, an oxide of chromium, and an oxide of tantalum.
- 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 may be a transparent conductive layer such as ITO (Indium Tin Oxide) or IZO (Indium Zinc Oxide). These transparent 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.
- a constituent material of such a hole injection layer or a hole transport layer for example, benzine, styrylamine, triphenylamine, porphyrin, triphenylene, azatriphenylene, tetracyanoquinodimethane, triazole, imidazole, oxadiazole, Polyarylalkanes, phenylenediamines, arylamines, oxazoles, anthracenes, fluorenones, hydrazones, stilbenes or derivatives thereof, or heterocyclic conjugated systems such as polysilane compounds, vinylcarbazole compounds, thiophene compounds or aniline compounds Monomers, oligomers or polymers can be used.
- the light emitting layer is a region that emits light 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.
- the host material main material
- the material to be the dopant high concentration doping is possible if a material having a tertiary amine having a hole transport property in the molecular structure has a characteristic that the intermolecular interaction is small and the concentration is not easily quenched. And function as one of the optimal dopants.
- the material constituting the light emitting layer as described above can be selected according to a desired light emission color.
- a desired light emission 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 stacked, and has a tandem structure in which a plurality of light-emitting layers are stacked through a connection layer. Also 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 forming the electron transport layer include quinoline, perylene, phenanthroline, bisstyryl, pyrazine, triazole, oxazole, oxadiazole, fluorenone, and derivatives or metal complexes thereof.
- tris (8-hydroxyquinoline) aluminum abbreviated as Alq 3
- anthracene naphthalene
- phenanthrene pyrene
- anthracene perylene
- butadiene coumarin
- acridine stilbene
- 1,10-phenanthroline or a derivative or metal thereof A complex.
- 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 is formed using a material having a small work function and good light transmittance.
- materials 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.
- Preparation of cellulose acylate [Preparation of Cellulose Acylate 1] 25 g of acetic acid was added to 30 g of cellulose (manufactured by Nippon Paper Industries Co., Ltd.) and stirred at 54 ° C. for 30 minutes. After cooling this mixture, 130 g of acetic anhydride cooled in an ice bath and 1.2 g of sulfuric acid were added for esterification. In the esterification, stirring was performed for 150 minutes while adjusting the liquid temperature so as not to exceed 40 ° C. After completion of the reaction, a mixed solution of 30 g of acetic acid and 10 g of water was added dropwise over 20 minutes to hydrolyze excess anhydride.
- cellulose acylate 1 had an acetyl substitution degree of 2.40, a weight average molecular weight of 220,000, and an octanol / water partition coefficient (log P value) of ⁇ 3.72.
- logP value is a product made by Cambridge Soft, Chem Draw Ultra ver. Crippen's fragmentation by J.C. Chem. Inf. Comput. Sci. 27, 21 (1987). Calculated based on the above.
- the weight average molecular weights Mw of the cellulose acylates 1 to 16 prepared in Table 1 described above were measured using gel permeation chromatography (GPC) according to the above method.
- Fine particle additive solution 1 While sufficiently stirring the inside of the dissolution tank containing 5 parts by mass of methylene chloride, 5 parts by mass of the fine particle dispersion prepared above was slowly added. 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.
- a main dope 1 having the following composition was prepared. First, methylene chloride and ethanol were added to the pressure dissolution tank. Cellulose acylate 1 having an acetyl group substitution degree of 2.40 and compound C were charged into a pressure dissolution tank containing an organic solvent while stirring. This was completely dissolved with heating and stirring. Next, Azumi Filter Paper No. The main dope 1 was prepared by filtration using 244.
- the prepared main dope 1 was uniformly cast (cast) on a stainless steel belt support at a temperature of 33 ° C. and a width of 2000 mm using an endless belt casting apparatus. Next, after the solvent was evaporated until the amount of residual solvent in the formed film became 75%, the film was peeled off from the stainless steel belt support with a peeling tension of 130 N / m.
- the film was stretched 1.0% in the width direction using a tenter.
- the residual solvent at the start of stretching was 15%.
- drying was terminated while the drying zone was conveyed by a number of rollers.
- the drying temperature was 130 ° C. and the transport tension was 100 N / m.
- the raw film was unwound from the film unwinding step, and obliquely stretched using an oblique stretching tenter as shown in FIG. 2A.
- the film lamination roll wound up by the front process it was set as the form drawn out from the tail (outside winding).
- a preheating zone As a zone combination at this time, a preheating zone, a transverse stretching zone, an oblique stretching zone, a holding zone, and a cooling zone are used.
- the main shaft of the guide roller closest to the entrance of the oblique stretching tenter and the gripping tool for the oblique stretching tenter was 80 cm.
- a clip having a length of 5.08 cm (2 inches) as the guide roller was used, and a clip having a diameter of 10 cm was used.
- the temperature of the preheating zone is 193 ° C.
- the temperature of the transverse stretching zone is 190 ° C.
- the temperature of the oblique stretching zone is 190 ° C.
- the temperature of the holding zone is 190 ° C.
- the temperature of the cooling zone is 110 ° C.
- the take-up tension at the tenter outlet was 200 N / m.
- the film was stretched under the condition of 1.6 times as the draw ratio at this time. As a breakdown of the stretching ratio, the film was stretched so as to be 1.18 times in the transverse stretching zone and 1.36 times in the oblique stretching zone. At this time, the film was stretched in an oblique direction so that the orientation angle ⁇ was 45 °. When the rail bent 45 °, it contracted 0.71 times in the direction perpendicular to the extension.
- the stretched film was controlled such that the fluctuation in the take-up tension was less than 3% by performing feedback control in which the change in the tension measured with the first roller on the oblique stretch tenter outlet side was reflected in the take-up motor rotation speed.
- both ends of the film are trimmed, the conveyance direction is changed by a conveyance direction changing device composed of an air flow roller, the film is wound by a slidable winding device, and is a 2000 mm wide roll-like long ⁇ / 4 phase difference film. 1 was obtained.
- the in-plane retardation value Ro is in the range of 120 to 160 nm, and the retardation in the film thickness direction
- the foundation value Rt was in the range of 80 to 110, and the orientation angle ⁇ was in the range of 45 ° ⁇ 1 ° with respect to the film longitudinal direction.
- Preparation of protective film 1 251 g of 1,2-propylene glycol, 278 g of phthalic anhydride, 91 g of adipic acid, 610 g of benzoic acid, 0.191 g of tetraisopropyl titanate as an esterification catalyst, 2 L equipped with a thermometer, stirrer and slow cooling tube The temperature was gradually raised while stirring until it reached 230 ° C. in a nitrogen stream. The ester compound 1 was obtained by carrying out dehydration condensation reaction for 15 hours, and distilling off unreacted 1,2-propylene glycol under reduced pressure at 200 ° C. after completion of the reaction. The acid value was 0.10 mg KOH / g, and the number average molecular weight was 450.
- the main dope 2 was uniformly cast on the stainless steel band support using a belt casting apparatus.
- the solvent was evaporated until the residual solvent amount reached 100%, and the stainless steel band support was peeled off.
- the cellulose ester film web was evaporated at 35 ° C., slit to 1.65 m width, stretched 30% in the TD direction (film width direction) with a tenter while applying heat at 160 ° C., and MD direction (longitudinal) Direction).
- the residual solvent amount at the start of stretching was 20%. Then, after drying for 15 minutes while transporting the inside of a drying device at 120 ° C.
- the protective film 1 was obtained.
- the residual solvent amount of the protective film 1 was 0.2%, the film thickness was 40 ⁇ m, and the number of turns was 3900 m.
- the orientation angle ⁇ of the protective film 1 was measured using KOBRA-21ADH manufactured by Oji Scientific Instruments, and as a result, it was in the range of 90 ° ⁇ 1 ° with respect to the film longitudinal direction.
- Step 1 The ⁇ / 4 retardation film 1 and the stretched protective film 1 are immersed in a 2 mol / L sodium hydroxide solution at 60 ° C. for 90 seconds, then washed and dried, and the side to be bonded to the polarizer is attached. Saponified.
- Step 2 The polarizer was immersed in a polyvinyl alcohol adhesive tank having a solid content of 2% by mass for 1 to 2 seconds.
- Step 3 Excess adhesive adhered to the polarizer in Step 2 was lightly wiped off, and this was placed on the ⁇ / 4 retardation film 1 processed in Step 1.
- Step 4 The ⁇ / 4 retardation film 1, the polarizer, and the protective film 1 laminated in Step 3 were bonded within a pressure range of 20 to 30 N / cm 2 and a conveyance speed of about 2 m / min.
- Step 5 A sample obtained by bonding the polarizer prepared in Step 4, the ⁇ / 4 retardation film 1 and the protective film 1 in a drier at 80 ° C. was dried for 2 minutes to prepare a circularly polarizing plate 1.
- circularly polarizing plates 2 to 23 In the production of the circularly polarizing plate 1, circularly polarizing plates 2 to 23 were produced in the same manner except that the ⁇ / 4 retardation films 2 to 23 were used in place of the ⁇ / 4 retardation film 1, respectively.
- the produced ⁇ / 4 retardation film 5 was dissolved in the film surface in step 1, and obvious damage was observed.
- the ⁇ / 4 retardation film 20 was peeled off from the polarizer in Step 5, and the polarizing plate was not produced.
- Table 2 shows the configuration of each of the ⁇ / 4 retardation films produced above.
- a reflective electrode made of chromium is formed on a glass transparent substrate 1a, ITO is formed on the reflective electrode as a metal electrode 2a (anode), and poly (3,3 is formed on the anode as a hole transport layer.
- PDOT: PSS 4-Ethylenedioxythiophene) -polystyrene sulfonate
- PEDOT: PSS 4-Ethylenedioxythiophene) -polystyrene sulfonate
- the light emitting layers 3aR, 3aG, and 3aB of G and B were formed with a film thickness of 100 nm.
- red light emitting layer 3aR tris (8-hydroxyquinolinate) aluminum (Alq 3 ) as a host, and [4- (dicyanomethylene) -2-methyl-6 (p-dimethylaminostyryl) -4H-pyran as a luminescent compound. (DCM) were co-evaporated (mass ratio 99: 1) to form a thickness of 100 nm.
- the green light emitting layer 3aG was formed by co-evaporating Alq 3 as a host and coumarin 6 as a light emitting compound (mass ratio 99: 1) to a thickness of 100 nm.
- the blue light-emitting layer 3aB was formed with a thickness of 100 nm by co-evaporating BAlq as a host and Perylene as a light-emitting compound (mass ratio 90:10).
- first cathode having a low work function so that electrons can be efficiently injected onto the light emitting layer calcium is deposited to a thickness of 4 nm by vacuum deposition, and a second cathode is formed on the first cathode.
- aluminum was formed to a thickness of 2 nm.
- the aluminum used as the second cathode has a role of preventing calcium as the first cathode from being chemically altered when the transparent electrode 4a formed thereon is formed by sputtering. is there.
- 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 by using a spectral radiance meter CS-1000 manufactured by Konica Minolta Optics, Inc. so that the front luminance at 2 ° C. and the optical axis of the spectral radiance meter coincides 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.
- A The reflection color is exactly the same as that of the organic EL image display device that has not been subjected to the forced deterioration process.
- Organic EL image display device screen that has not been subjected to forced deterioration processing is reddish, but is acceptable in practice.
- Organic EL that has not been subjected to forced deterioration processing It is a quality that is a practical problem at a level where redness is extremely worrisome for the image display device screen [Evaluation of deterioration resistance of phosphors] The circularly polarizing plate was peeled off from the panel of each organic EL image display device that had been subjected to a forced deterioration treatment for 48 hours in an environment of 80 ° C.
- the organic EL image display device provided with the ⁇ / 4 retardation film having the configuration defined in the present invention is resistant to polarizer deterioration (redness change resistance) with respect to the comparative example. ) And the deterioration resistance of the phosphor.
- the organic electroluminescence image display device of the present invention has characteristics excellent in resistance to deterioration of a polarizer and deterioration of a light emitter, and is a flat illumination, a light source for an optical fiber, a backlight for a liquid crystal display, a backlight for a liquid crystal projector, and a display It can be suitably used as various light sources such as devices.
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Abstract
Description
図1は、本発明の有機エレクトロルミネッセンス画像表示装置(以下、有機EL画像表示装置ともいう)の構成の一例を示す概略図である。
本発明に係る円偏光板に用いる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、フィルム面内の遅相軸x方向における屈折率を表す。nyは、フィルム面内のx方向に直交するy方向における屈折率を表す。dは、フィルムの膜厚(nm)を表す。各屈折率は、23℃、55%RHの環境下で、測定波長550nmで測定した値である。
本発明に係る円偏光板は、少なくとも偏光子とλ/4位相差フィルムとで構成され、有機EL画像表示装置に使用することにより、有機EL素子を構成する金属電極の鏡面反射を遮蔽することができる。
本発明においては、本発明に係るλ/4位相差フィルムを構成する材料のオクタノール・水分配係数(logP値)の平均値を、-3.00~4.00の範囲内とすることを特徴とする。
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、薄膜化が可能であること、高いリターデーションを発現させても延伸倍率を低く抑えることができ、破断等の故障を回避することができるなどの観点から、セルロースアシレーを70質量%以上含有し、該セルロースアシレートの総アシル基置換度の平均値が1.00~3.00の範囲内であるフィルムを用いることが好ましい。
カラム: Shodex K806、K805、K803G(昭和電工(株)製を3本接続して使用する)
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する。13サンプルは、ほぼ等間隔に用いる。
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のヒドロキシ基を表す。
次に、本発明に係るλ/4位相差フィルムの製膜方法の例を説明するが、これに限定されるものではない。
本発明に係るλ/4位相差フィルムの製造方法の一つとして、溶液流延法によって製造することができる。溶液流延法は、樹脂や添加剤等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、金属支持体からウェブを剥離する工程、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。
本発明に係るλ/4位相差フィルムを溶液流延法で、各種構成材料を溶解してドープを調製するのに有用な有機溶媒は、セルロースアシレート、その他の添加剤を同時に溶解するものであれば、特に制限なく用いることができる。
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試料の質量を表し、NはMを115℃で1時間の加熱を行って、フィルム中の溶媒を除去した後の質量を表す。
本発明に係るλ/4位相差フィルムは、波長550nmで測定したときの面内方向のリターデーション値Ro(550)が100~180nmの範囲内であることが好ましい。該リターデーション値Roは、フィルムの延伸処理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いう。
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しても良い。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(ドープともいう)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シレートを含む溶融物を流延する方法である。
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の範囲内で用いられる。更には、膜厚が10~100μmの範囲内であることが好ましく、特には30~60μmの範囲内であることが好ましい。
本発明に係る偏光板保護層(図1に記載の10)は、保護フィルムであることが好ましく、構成材料としては、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。
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、以下、反射防止層ともいう)を塗設して、外光反射防止機能を付与することも好ましい態様である。
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)
反射防止層において、低屈折率層は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℃、55%RHの環境下で、波長550nmの測定で、1.30~1.45の範囲内であることが好ましい。
Si(OR)4
上記一般式(OSi)で表される有機珪素化合物において、Rは炭素数が1~4のアルキル基を表す。一般式(OSi)で表される有機珪素化合物の具体例としては、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としては、23℃、55%RHの環境下で、波長550nmの条件で測定したとき、屈折率を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の範囲内が好ましく、10~200nmの範囲内であることが更に好ましく、30~100nmの範囲内であることが最も好ましい。屈折率を調整する手段は、金属酸化物微粒子等を添加することで達成できる。用いる金属酸化物微粒子の屈折率は、1.80~2.60の範囲内であるものが好ましく、1.85~2.50の範囲内であるものが更に好ましい。
図1に示した本発明の有機EL画像表示装置A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。
次いで、本発明の有機EL画像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に示した有機EL画像表示装置Aで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、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101側から光を取り出す場合には、基板101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。
基板101として樹脂フィルムを用いる場合、適用可能な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、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。
基板101として、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、ガラス板を用いることが好ましい。本発明に適用可能なガラス板の厚みとしては、0.1~10mmの範囲内が好ましい。0.1mm以上であれば、耐久性に優れ、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、また熱をかけた場合でも反りを生じず、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量化することができ、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)102には、効率良く正孔を注入するための電極材料として、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)の金属及びこれらの合金、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を、単独又は混在させた状態で用いることができる。
〈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構成材料としては、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を呈する領域である。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、濃度が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。電子輸送層を形成する材料としては、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。
〔セルロースアシレート1の調製〕
セルロース(日本製紙(株)製溶解パルプ)の30gに酢酸を25g加え、54℃で30分撹拌した。この混合物を冷却した後、氷浴中で冷却した無水酢酸の130gと、硫酸の1.2g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、150分の攪拌を行った。反応終了後、酢酸30gと水10g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90gと水30gを加えて1時間撹拌した。次いで、酢酸マグネシウムを2g含有した水溶液中に混合物を添加し、しばらく撹拌した後にろ過、乾燥し、セルロースアシレート1を得た。得られたセルロースアシレート1は、アセチル置換度2.40、重量平均分子量は220000、オクタノール・水分配係数(logP値)は-3.72であった。なお、logP値は、Cambridge Soft社製、Chem Draw Ultra ver.0.1のCS ChemPropによりCrippen’s fragmentation:J.Chem.Inf.Comput.Sci.,27,21(1987).にもとづいて計算を行って求めた。
上記セルロースアシレート1の調製において、酢酸、無水酢酸の他に、更にプロピオン酸、無水プロピオン酸、酪酸、無水酪酸を適宜使用して、酸の量を調整した以外は同様にしてセルロースのエステル化操作を行い、表1に記載の総置換度、アセチル基置換度、プロピオニル基置換度、logP値を有するセルロースアシレート2~16を調製した。
〔λ/4位相差フィルム1の作製〕
(微粒子分散液の調製)
微粒子(アエロジル R812 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、圧力型分散機であるマントンゴーリン分散機を用いて分散を行った。
メチレンクロライド5質量部を入れた溶解タンク内を十分に攪拌しながら、上記調製した微粒子分散液5質量部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で分散を行った。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。
下記の組成からなる主ドープ1を調製した。はじめに、加圧溶解タンクにメチレンクロライドとエタノールを添加した。有機溶媒の入った加圧溶解タンクにアセチル基置換度2.40のセルロースアシレート1及び化合物Cを攪拌しながら投入した。これを加熱し、攪拌しながら、完全に溶解した。次いで、安積濾紙(株)製の安積濾紙No.244を使用して濾過し、主ドープ1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1(アセチル基置換度:2.40、重量平均分子量:22万) 100質量部
化合物C(芳香環数:3個、logP値:7.00) 7.2質量部
微粒子添加液1 2.0質量部
(λ/4位相差フィルムの製膜)
上記調製した主ドープ1を、無端ベルト流延装置を用いて、温度33℃、幅2000mmでステンレスベルト支持体上に均一に流延(キャスト)した。次いで、製膜したフィルム中の残留溶媒量が75%になるまで溶媒を蒸発させた後、剥離張力130N/mで、ステンレスベルト支持体上から剥離した。
上記λ/4位相差フィルム1の作製において、セルロースアシレートの種類及び構成比率、添加剤の種類及び添加量を、表2に記載の組み合わせに変更した以外は同様にして、λ/4位相差フィルム2~23を作製した。
化合物B:芳香環数=3個以上、logP値=6.47
化合物C:芳香環数=3個、logP値=7.00
EPEG:芳香環数=1個、logP値=2.34
(エステル化合物1の調製)
1,2-プロピレングリコールを251g、無水フタル酸を278g、アジピン酸を91g、安息香酸を610g、エステル化触媒としてテトライソプロピルチタネートを0.191g、温度計、撹拌器、緩急冷却管を備えた2Lの四つ口フラスコに仕込み、窒素気流中230℃になるまで、撹拌しながら徐々に昇温した。15時間脱水縮合反応させ、反応終了後、200℃で未反応の1,2-プロピレングリコールを減圧留去することにより、エステル化合物1を得た。酸価は0.10mgKOH/g、数平均分子量は450であった。
セルロースアセテート(アセチル基置換度:2.88、重量平均分子量:約27万) 90質量部
エステル化合物1 10質量部
チヌビン928(BASFジャパン(株)製) 2.5質量部
微粒子添加液(前出) 4質量部
メチレンクロライド 432質量部
エタノール 38質量部
以上を密閉容器に投入し、加熱し、撹拌しながら、完全に溶解し、安積濾紙(株)製の安積濾紙No.24を使用して濾過し、主ドープ2を調製した。
次に、ベルト流延装置を用い、主ドープ2をステンレスバンド支持体上に均一に流延した。ステンレスバンド支持体で、残留溶媒量が100%になるまで溶媒を蒸発させ、ステンレスバンド支持体上から剥離した。セルロースエステルフィルムのウェブを35℃で溶媒を蒸発させ、1.65m幅にスリットし、160℃の熱をかけながらテンターでTD方向(フィルムの幅手方向)に30%延伸し、MD方向(長手方向)に1%延伸した。延伸を始めたときの残留溶媒量は20%であった。その後、120℃の乾燥装置内を多数のローラで搬送させながら15分間乾燥させた後、1.49m幅にスリットし、フィルム両端に幅15mm、高さ10μmのナーリング加工を施し、巻芯に巻き取り、保護フィルム1を得た。保護フィルム1の残留溶媒量は0.2%であり、膜厚は40μm、巻数は3900mであった。
〔偏光子の作製〕
厚さ、120μmのポリビニルアルコールフィルムを、一軸延伸(温度110℃、延伸倍率5倍)した。これをヨウ素0.075g、ヨウ化カリウム5g、水100gからなる水溶液に60秒間浸漬し、次いでヨウ化カリウム6g、ホウ酸7.5g、水100gからなる68℃の水溶液に浸漬した。これを水洗、乾燥して、偏光子を得た。
次いで、下記工程1~5に従って偏光子とλ/4位相差フィルム1と、裏面側(視認側)には保護フィルム1を長手方向で合わせるようにロール・トゥ・ロール(表中RtoRと記載)で貼り合わせて円偏光板1を作製した。
上記円偏光板1の作製において、λ/4位相差フィルム1に代えて、それぞれλ/4位相差フィルム2~23を用いた以外は同様にして、円偏光板2~23を作製した。
図6に示す構成からなる有機エレクトロルミネッセンス画像表示装置1~23を作製した。
図6に示すように、ガラス製の透明基板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6に示すように、R、G、B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、発光性化合物として[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、発光性化合物としてクマリン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、発光性化合物として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を、図6に記載の構成となるように、対向して接着層6aを用いて固定化することで、有機EL画像表示装置1~23を作製した。
〔偏光子の劣化耐性の評価:赤味変色耐性の評価〕
上記作製した各有機EL画像表示装置を、80℃、90%RHの環境下で48時間の強制劣化処理を施した後、電圧を印加せず、発光していない状態にして、照度約100lxの照明下で、上記強制劣化試験を行っていない同じ有機EL画像表示装置と並べて配置し、反射色の赤味レベルを視感評価し、下記の基準に従って偏光子の劣化耐性の評価を行った。
○:強制劣化処理を行っていない有機EL画像表示装置画面に対し、僅かに赤味が見られるが、全く気にならない品質である
△:強制劣化処理を行っていない有機EL画像表示装置画面に対し、赤味が見られるが、実用上は許容される品質である
×:強制劣化処理を行っていない有機EL画像表示装置画面に対し、赤味が極めて気になるレベルで、実用上問題となる品質である
〔発光子の劣化耐性の評価〕
80℃、90%RHの環境下で48時間の強制劣化処理を施した各有機EL画像表示装置のパネルから円偏光板を剥離し、単離した各有機EL素子に6Vの直流電圧を印加した際の輝度Aを測定した。強制劣化処理を行っていない有機EL画像表示装置から分離した各有機EL素子の輝度B(1200cd/m2)に対する劣化比率{(輝度B-輝度A/輝度B)×100(%)}を求め、これを発光子の劣化耐性の尺度とした。
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
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
A 有機EL画像表示装置
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、9a λ/4位相差フィルム
109、8a 偏光子
110 偏光板保護層
111 表面反射防止層
10a、C 円偏光板
11a、B 有機EL表示素子
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
Claims (6)
- 少なくともλ/4位相差フィルムを有する円偏光板と有機エレクトロルミネッセンス素子とを備えた有機エレクトロルミネッセンス画像表示装置において、該λ/4位相差フィルムを構成する材料のオクタノール・水分配係数(logP値)の平均値が、-3.00~4.00の範囲内であることを特徴とする有機エレクトロルミネッセンス画像表示装置。
- 前記λ/4位相差フィルムが、セルロースアシレーを70質量%以上含有し、該セルロースアシレートの総アシル基置換度の平均値が1.00~3.00の範囲内であり、かつ炭素数が3以上のアシル基の置換度の平均値が0.65~2.50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画像表示装置。
- 前記λ/4位相差フィルムが、セルロースアシレーを70質量%以上含有し、該セルロースアシレートの総アシル基置換度の平均値が1.00~3.00の範囲内であり、かつ炭素数が3以上のアシル基の置換度の平均値が0.90~2.50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画像表示装置。
- 前記λ/4位相差フィルムが、1)総アシル基置換度が2.60以下で、かつ炭素数が3以上のアシル基置換度が1.00以下のセルロースアシレートAと、2)炭素数が3以上のアシル基置換度が1.50以上のセルロースアシレートBとを含有することを特徴とする請求項1から3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画像表示装置。
- 前記λ/4位相差フィルムが、少なくとも3個の芳香環を有する芳香族化合物を、前記セルロースアシレート全質量に対し2.0~15.0質量%の範囲内で含有することを特徴とする請求項2から4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画像表示装置。
- 有機エレクトロルミネッセンス画像表示装置は、前面板が無く、かつ構成するガラス板が1枚以下であることを特徴とする請求項1から5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画像表示装置。
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JP2016105166A (ja) * | 2014-11-20 | 2016-06-09 | 日東電工株式会社 | 有機el表示装置用円偏光板および有機el表示装置 |
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