TW201001027A - Retardation film, elliptical polarizer, liquid crystal display device, and method of fabricating elliptical polarizer - Google Patents

Abstract

Provided is a retardation film which is made of a polypropylene resin, has an in-plane retardation value R0 of 70 nm to 200 nm, an Nz coefficient of 1.1 to 2 where nx represents a refractive index of the film in the in-plane delayed-phase axial direction, ny represents a refractive index in the in-plane advanced-phase axial direction, and nz represents a refractive index in the thicknesswise direction, and has a standard deviation of a delayed-phase axial angle of 0.6 DEG or less measured at an interval of 1 mm or less. The retardation film is thin and has flat wavelength dispersion of retardation. The retardation film, when combined with a 1/2 wavelength plate, forms a wide band 1/4 wavelength plate, which demonstrates an excellent light shielding performance, avoids bonding irregularity and white spots at the time of bonding, and has a wide view angle characteristic. The retardation film is favorably used as a biaxial 1/4 wavelength plate. In addition, an elliptical polarizer using such a retardation film, a method of fabricating the elliptical polarizer, and a liquid crystal display device using such a retardation film are also provided.

Description

[Technical Field] The present invention relates to a retardation film made of a polypropylene resin and an elliptically polarizing plate using the same. The present invention also relates to a liquid crystal display device using the elliptically polarizing plate of the present invention. The present invention is also related to a method of manufacturing an elliptically polarizing plate in which a phase difference film as described above is used as a 1/4 wave plate carrier and laminated with a linear polarizing plate. [Prior Art] In recent years, low power consumption and low voltage operation, lightweight and thin LCD display system as a mobile phone, personal digital assistant (P ers ο η a 1 Digital Assistant), computer screen The information display device (device) such as a television is rapidly spreading. With the development of liquid crystal technology, various types of liquid crystal displays or optical members have been disclosed, and the reaction time, contrast, viewing angle, and wide frequency region have been gradually improved. In a reflective or transflective liquid crystal display device used in a small liquid crystal display device such as a conventional mobile phone, a phase difference film which operates as a 1⁄4 wave plate, or a combination of a 1/4 wave plate and 1 / is used. The two-wave plate is a phase difference film which operates as a 1/4 wave plate in a wide frequency region, and is attached to an elliptically polarizing plate of a linear polarizing plate at a predetermined angle. The elliptically polarizing plate, particularly a circular polarizing plate, has an anti-reflection function, and in various applications, it is possible to sufficiently suppress the internal reflection of all incident light in the visible light region visible to the human eye to obtain good light-shielding performance. For example, in Japanese Laid-Open Patent Publication No. Hei No. Hei-5-101 (Patent Document 1), a group of 1/4 wave plates and 1/2 wave plates formed of a polycarbonate film is disclosed. However, since the wide-band 1/4 wave plate of polycarbonate is used as a complete 1-wave plate in all wavelengths, it is difficult to adequately control the internal reflection, and good light-shielding performance cannot be obtained. In addition, the polycarbonate film has a large photoelastic coefficient of about 2 7 X 1 (Γ 13 c m2 / dyne ', so there is uneven adhesion when it is attached to a linear polarizing plate, or temperature change due to use' even if In the black display, the light of the backlight is still penetrated, and the problem of the white spot phenomenon is generated. In the following, it is disclosed in Japanese Patent Publication No. Hei 1 1 - 1 4 9 0 1 5 (Patent Document 2), when the wavelength is 40 Onm. The difference between the maximum refractive index and the minimum refractive index in the in-plane (birefringence) Δ n4QC), and the ratio of the difference between the maximum refractive index and the minimum refractive index in the in-plane (birefringence) Δ n5〇D at a wavelength of 500 nm ( Δ n4 0 0 / Δ 11500) is a 1/2 wave plate and a 1/4 wave plate of less than 1.0. 'As an example', it is disclosed that a 1/4 wave of a combination of a cyclic polyalkene resin film is formed. Film and W2 wave plate. The cyclic polyalkene resin film has a small photoelastic coefficient of about 4 X 1 (Γ 13 c m 2 /dyne, and also effectively suppresses unevenness or white spots. However, the conformal lamination is usually uniaxially aligned. When the film is a quarter-wave plate or a 1/2-wave plate polarizing plate in the VA mode liquid crystal cell, in the front direction, the black light shows a small amount of light and drain, which can achieve 1 〇〇〇: 1 degree. The front side contrasts, but the light leakage from the oblique direction occurs, and there is a problem that the contrast from the oblique direction decreases. In order to reduce the light leakage due to the oblique direction, for example, the special publication 2006-1 7 1 7 1 3 (patent Document 3) discloses a circular polarizing plate using a norbornene-based resin and a biaxial 1/4 wave plate made of -6-201001027. However, the discovery rate of the phase difference of the norbornene-based resin is low, and In the case of the first embodiment of the patent document 3, the thickness of the λ /4 wave plate film is as large as that of the first embodiment, and it is difficult to follow the thickness reduction of the small and medium-sized applications. (Patent Document 4) discloses a single axis formed from a norbornene-based resin The 1/4 wave plate forms a cholesterol 'alignment layer and becomes a technique of biaxial 1/4 wave plate. However, this method has a problem that the steps become complicated. The prior art document patent document patent document 1: special opening Japanese Patent Laid-Open Publication No. Hei No. Hei No. Hei No. 1 1 - 1 4 9 0 1 5 Patent Document 3: Special Opening 2 0 0 6 - 1 7 1 7 1 3 Patent Document 4: Special Opening 2 0 OBJECT OF THE INVENTION PROBLEM TO BE SOLVED BY THE INVENTION The present invention has been made to solve the above problems, and as a purpose of providing a wavelength which is thin and has a phase difference, Uniform, when combined with a 1 /2 wave plate into a W4 wave plate in a wide frequency region, it exhibits good light-shielding performance and disjoints or white spots when the bonding is released. In addition, it has a wide viewing angle characteristic and can be applied as a double axis. The phase difference film of the chord 1 and the elliptically polarizing plate and the liquid crystal display device using the same. The present invention is excellent in the precision of the slow axis angle by performing the 201001027 biaxial stretching or the lateral extension. Biaxial film and wideband It is also an object of the present invention to provide a retardation film which is excellent in front-facing and excellent in efficiency, and an elliptically polarizing plate and a liquid crystal display device using the same. The present invention provides an elliptically polarizing plate which can efficiently produce the above-mentioned elliptically polarizing plate. Solution to the Invention The retardation film of the present invention is formed of a polypropylene resin, and the in-plane retardation 値R〇 is in the range of 70 to 200 nm, and the refractive index of the in-plane retardation axis direction of the film is nx, in-plane. When the refractive index in the direction of the phase axis is ny and the refractive index in the thickness direction is nz, the Nz coefficient defined by the following formula (1) is in the range of 1 · 1 to 2 'the retardation measured at intervals of 1 mm or less The standard deviation of the shaft angle is below 0.6°.

Nz = (nx-nz)/(nx-ny) ( 1 ). The polypropylene resin in the retardation film of the present invention is preferably a copolymer of propylene and ethylene containing 10% by weight or less of ethylene. Further, the retardation film of the present invention is preferably operated by a 1/4 wave plate. The present invention further provides an elliptically polarizing plate obtained by laminating the above-described retardation film of the present invention which operates as a 1/4 wave plate on a linear polarizing plate. Further, the present invention also provides an elliptically polarizing plate in which a phase difference film which operates as a 1 /2 wave plate is disposed between the retardation film of the present invention which operates as a 1/4 wave plate and a linear polarizing plate. The present invention also provides a liquid crystal display device in which the elliptically polarizing plate -8-201001027 of the present invention is laminated on at least one side of a liquid crystal cell. Further, the present invention also provides a method of manufacturing an elliptically polarizing plate obtained by laminating the above-described retardation film of the present invention which operates as a 1/4 wave plate on a linear polarizing plate. In this case, the manufacturing method of the elliptically polarizing plate of the present invention has a linear polarizing plate in which the absorption axis is parallel or perpendicular to the longitudinal direction of the film, and is cut in the direction of the longitudinal direction of the film, and sequentially cut to obtain a parallelogram. The step of cutting out the body and the polypropylene resin, the phase difference 値R〇 in the range of 70~20 0nm, the Nz coefficient defined by the following formula (1) is 1. 1~2 The standard deviation of the retardation axis angle measured at intervals of 1 mm or less is 0.6° or less, and the retardation axis is parallel or perpendicular to the longitudinal direction of the film, and the 1/4 wave plate is fed from the roller to the bonding device. a step of: forming the cut body and the W4 wave plate such that two sides of the cut body are cut in parallel and parallel to both side edges along the longitudinal direction of the 1/4 wave plate are performed by the bonding device The step of fitting. Further, a method of manufacturing an elliptically polarizing plate in which a retardation film which operates as a 1/2-wave plate is disposed between a 1/4 wave plate and a linear polarizing plate which is formed by the above-described retardation film of the present invention is also provided. In this case, the manufacturing method of the elliptically polarizing plate of the present invention has a linear polarizing plate in which the absorption axis is parallel or perpendicular to the longitudinal direction of the film, and is cut in the direction of the longitudinal direction of the film, and sequentially cut to obtain a parallelogram. The step of cutting out the body and the step of forming the 1/2 wave plate which is parallel or perpendicular to the longitudinal direction of the film from the thermoplastic resin, and the step of feeding the roller from the first bonding device' and cutting the foregoing The body and the 1/2 wave plate are arranged such that the two sides of the cut body are cut in parallel and are parallel to the both side edges along the longitudinal direction of the 1/2 wave plate. The first fit is -9-201001027 The apparatus performs a bonding step, and the bonding body of the cut body and the W2 wave plate is cut in a direction in which the longitudinal direction of the film is set at an angle, thereby obtaining a parallelogram cut body, and a polypropylene The in-plane phase difference 値R〇 is in the range of 70 to 200 nm, and the Nz coefficient defined by the above formula (1) is in the range of 1.1 to 2, and is determined by the interval of 1 mm or less. The standard deviation of the phase axis angle is 〇_6 ° or less, and the slow phase axis is opposite to the film. a quarter-wave plate in which the longitudinal direction is parallel or perpendicular, the step of feeding the roller from the second bonding device, and the cutting body and the quarter-wave plate, so that the cutting body is cut in parallel by the two sides The step of bonding to the second bonding means along the side edges along the longitudinal direction of the 1/4 wave plate is set at an angle. According to the present invention, the 1 / 4 wave plate can be made to have a wide viewing angle characteristic as a biaxial property, and the standard deviation of the slow phase axis angle measured at intervals of 1 mm or less is 0.6 or less, thereby achieving high contrast. A phase difference film. In addition, since a polypropylene resin is used as the base film, the expansion ratio can be increased, and the phase difference film can be made wider, and the effect of providing a biaxial 1/4 wave plate excellent in utilization efficiency can be obtained. Thereby, the thickness is thin and the wavelength of the phase difference is uniformly dispersed, and the 1 / 4 wave plate and the 1 / 2 wave plate are combined, and when the broadband region is 1 / 4 wave plate, the light shielding performance is good and the bonding is simultaneously released. In the case of a misalignment or a white spot, a phase difference film including a biaxial one-wave plate having a wide viewing angle characteristic, and an elliptically polarizing plate or a liquid crystal display device using the same are provided. Further, according to the present invention, an elliptically polarizing plate in which the retardation film and the linear polarizing plate are laminated can be efficiently produced. 10-201001027 The best form for implementing the invention &lt;Retardation film&gt; In the present invention, the polypropylene resin is sequentially biaxially stretched or transversely formed into a retardation film. Since the polypropylene resin film is excellent in the crystal phase difference, the rate of discovery is extremely high. Therefore, a film having a thin film thickness and having a desired retardation film can be obtained. In addition, because the polypropylene resin has a wavelength of 400 nm, the difference between the maximum refractive index and the minimum refractive index (birefringence) Δ n4 〇〇, the difference between the maximum refractive index and the minimum refractive index in the in-plane Δ n5〇 The ratio of 〇(Δη4〇()/Δη5()()) is less than 1_〇5, so the 1/4-wave plate and 1/2-wave plate composed of acryl-based resin can be used to distinguish the wide-band area of the light-shielding property. 1 / 4 wave plate. In the present specification, the above η50〇 is defined as the wavelength dispersion of the phase difference. Disseminate this abbreviation." In addition, since the polypropylene resin has a photoelastic coefficient of 22xl (about T13cm2/dyne), when the 1/2 wave plate is bonded in time, or when it is bonded to a linear polarizing plate, it is possible to suppress the unevenness or the adhesion because of the polypropylene system. Since the resin can be extended at a high magnification, the axial extension or the lateral extension increases the precision of the retardation axis angle and achieves widening. It is known that the Nz coefficient is obtained as a reference for the biaxiality, and the film is formed in the plane. The refractive index in the direction of the slow axis is nx extended film property, so the phase of the large phase 値 is combined with the wavelength 丨 (birefringence) to form a good Δ η 4 ο 〇 / Δ "wavelength is small, It is about W4 wave plate white spot. It is double and can be mourned at the same time. In-plane -11 - 201001027 The direction of the phase axis (in the direction perpendicular to the axis of the late phase) is ny, thickness direction The refractive index is nz. Then, when the thickness is d, the Nz coefficient, the in-plane phase difference 値R〇, and the phase difference 値Rth in the thickness direction are defined by the following formulas (1) to (3). Nz = ( Nx-nz)/(nx-ny) (1) R〇= (nx-ny)xd (2) Rth = [(nx+ ny)/2-nz]xd (3) Further, from the above formulas (1) to (3), the relationship between the Nz coefficient and the phase difference 値R〇 in the in-plane and the phase difference 値Rth in the thickness direction is It can be represented by the following formula (4): Nz-Rth/ R〇+ 0.5 (4) In the retardation film of the present invention, the in-plane phase difference 値R〇 is in the range of 70 to 200 nm, and is 100. The range of ~170 nm is preferably. The Nz coefficient is in the range of 1.1 to 2, preferably in the range of 1.4 to 1.8. Therefore, the viewing angle characteristics required for the liquid crystal display device to be applied can be appropriately selected. Next, the reason why the standard deviation of the optical axis such as the slow phase axis measured at intervals of 1 mm or less is specified. Conventionally, the retardation axis of the retardation film is generally measured by using a polarizing microscope. Because even if the magnification is maximized and the field of view of the microscope is about 1.5 mm, the optical axis obtained by this method is averaged in the region of 1 mm or more. On the other hand, the axis precision measured by this method is the same. And, -12 - 201001027 even if the phase difference in the plane is R〇 or thickness The phase difference 値Ru, the internal enthalpy, etc. are the same, and the enthalpy of the frontal contrast is still different. The inventors of the present invention have found that the influence of the interval of the micrometer unit of 1 mm or less is determined as a factor affecting the positive contrast. Axis precision is important. Considering the precision of the shaft measured by this method, the difference in frontal contrast can be explained. For such a micro-unit axis precision, for example, a small area automatic birefringence meter KOBRA-CCD/XY (Prince) can be used. Measurement machine (unit) system) measurement. The measurement interval is preferably 1 mm or less, preferably 0.8 mm or less, more preferably 0.5 mm or less, and the standard deviation of the axis precision is 0.6 or less, preferably 5 5 8 ° or less, and 0.5 5 ° or less. Especially good. &lt;Polypropylene-based resin&gt; The polypropylene-based resin used in the retardation film of the present invention can be obtained by separately polymerizing propylene using a known polymerization catalyst, and propylene and other copolymerizable copolymers. The comonomer is produced by a method of copolymerization or the like. As a known catalyst for polymerization, for example, (a) a Ti-Mg-based catalyst in which a solid catalyst component containing magnesium 'titanium and a halogen is an essential component, and (b) magnesium, titanium, and a halogen are essential components. Among the solid catalyst components, a combination of an organoaluminum compound, a catalytic component of a third component such as an electron-donating compound, and a (c) metallocene-based catalyst. Among these catalyst systems, a polypropylene resin used in the production of the retardation film of the present invention, (b) a solid catalyst component containing magnesium, titanium and halogen as essential components, a combination of an organoaluminum compound and an electron supply property Compounds can be used most often. More specifically, an organoaluminum compound is preferred, and a mixture of tris-l-201001027 ethylaluminum, triisobutylaluminum, triethylaluminum and diethylaluminum chloride, tetraethyldialumoxane can be cited. And as an electron-donating compound, for example, cyclohexylethyldimethoxydecane, tert-butylpropyldimethoxydecane, tert-butylethyldimethoxydecane, dicyclopentyldi Methoxydecane, etc. On the other hand, as a solid catalyst component containing magnesium, titanium, and a halogen as an essential component, for example, JP-A-61-1-2866, JP-A-6-287904, and JP-A-7 In the case of the catalyst system described in the above-mentioned Japanese Patent Publication No. 216 017, the metallocene-based catalyst is exemplified by, for example, Japanese Patent No. 2,857,269, No. 2,627,669, and No. 266 8 73 2 Recorded catalyst system. The polypropylene resin can be, for example, a solution polymerization method using an inert solvent represented by a hydrocarbon compound such as hexane, heptane, octane, decane, cyclohexane, methylcyclohexane, benzene, toluene or xylene. It is produced by a bulk polymerization method using a liquid monomer as a solvent, a gas phase polymerization method in which a gas monomer is polymerized in an original state, or the like. The polymerization by such methods can be carried out batchwise or continuously. The stereoregularity of the polypropylene resin may be any of isotactic, syndiotactic, and atactic. In the present invention, from the viewpoint of heat resistance, it is suitably used in a polypropylene resin which is in a row or in the same row. The polypropylene-based resin used in the retardation film of the present invention may be composed of propylene alone or in a ratio of, for example, 20% by weight or less to 10% by weight or less. The copolymerized copolymer monomer is copolymerized. When used as a copolymer, the amount of the copolymer -14-201001027 monomer is 1 weight%. The above is a viewpoint of improving the transparency or workability of the retardation film. It is preferable to form a random copolymer with any unsaturated hydrocarbon based on propylene. Among them, a copolymer with ethylene is preferred. In the case of a copolymer, an unsaturated hydrocarbon other than propylene (preferably ethylene) is preferable because the copolymerization ratio is 10% by weight or less, and particularly preferably 7% by weight or less. Further, the copolymerization ratio of the unsaturated hydrocarbons other than propylene (preferably ethylene) is preferably 1% by weight or more, more preferably 3% by weight or more. When the amount of the unsaturated hydrocarbon other than propylene is 1% by weight or more, there is a tendency to improve the workability or transparency. On the other hand, when the ratio exceeds 1% by weight, the melting point of the resin is lowered, and the heat resistance tends to be deteriorated. Further, when a copolymer of two or more kinds of copolymer monomers and propylene is used, the total content of the units of all the copolymer monomers contained in the copolymer is preferably in the above range. Further, the polypropylene-based resin used in the retardation film of the present invention may be a copolymer of α-olefin having a carbon number of 4 to 2 as a copolymer monomer, which is mainly composed of propylene. In this case, as the α-chain diluted hydrocarbon, specifically, 1-butene, 2-methyl·ι-propylene (above c4); 丨-pentene, 2-methyl-1-butene, 3-A Base-1-butadiene (above CO; 1-hexyl, 2-ethyl-1-butene, 2,3-methyl-1-butene, 2-methyl-1-pentene, 3· Methyl-1-pentene, 4-methyl-1-pentene, 3,3-dimethyl-1-butene (above c6); 1-heptacene, 2-methyl-p-hexene, 2 , 3-dimethyl-1-pentyl, 2-ethyl-1-hexyl, 2-methyl-3-ethyl-1-butene (above c7); 1-xincan, 5-methyl -heptene, 2-ethyl-1-hexene, 3,3-dimethyl-1-hexene, 2-methyl-3-ethyl-1-pentene, 2,3,4-tri Methyl-1-pentene, 2-propyl-indole-pentane, 2,3_di-15- 201001027 ethyl-1-pentene (above Cs); h-decene (above c9); i-癸Alkene (above C10); 1-undecene (above Ch); 1-dodecene (above c12); 1-tridecene (above Cu); 1-tetradecene (above Cl4); 1-pentadecene (above ci 5); 1-hexadecene (above c! 6); 1-hexadecene (above C17); 1-octadecene (above c18); 1-ten Nine carbonene (above Ci9), etc. The above is a carbon number of 4 to 12 alpha- The alkene is preferably used, and as the α-olefin having 4 to 12 carbon atoms, specific examples thereof include butene and 2-methyl-1-propene; 1-pentene, 2-methyl-1-butene, and 3 -methyl-1-butene; 1-hexene, 2-ethyl-1-butene, 2,3-dimethyl-butene, 2-methyl-1-pentene, 3-methyl 1-pentene, 4·methyl-1-pentene, 3,3-dimethyl-1-butene; 1-heptene, 2-methyl-1-hexene, 2,3-dimethyl 1-pentene, 2-ethyl-1-hexene, 2-methyl-3-ethyl-butene; octene, 5-methyl-1-heptene, 2-ethyl-1 -hexene, 3,3-dimethylhexene, 2-methyl-3-ethyl-1-pentene, 2,3,4-trimethyl-1-pentene, 2-propyl-oxime _pentene, 2,3-diethyl-1-butene: 1-decene: 1-decene; 1-undecene: 1-dodecene, etc. From the viewpoint of copolymerization, 1-butene, 1-pentene, 1-hexene and 1-octene are preferred, and 1-butene and 1-hexene are preferred. The copolymer may be a random copolymer or a block. Copolymer. As a suitable copolymer, a propylene/ethylene copolymer or a propylene/1-butene copolymer may be cited. The content of ethylene units in the propylene/ethylene copolymer or the propylene/1-butene copolymer. The content of the 1 -butene unit can be determined by infrared (IR) spectrometry according to the method described in the "Polymer Analysis Manual" (published by Kiyoshiya Shoten, 995). The polypropylene resin used in the retardation film of the present invention is based on -16-201001027 JIS K72 10 at a temperature of 23 ° C and a load of 21.18 N. The melt flow rate (MFR) is based on 〇·ι 2 〇 The range of 〇g/l〇 minutes is particularly preferably in the range of 0.5 to 50 g/10 minutes. By using a polypropylene resin as a whole, a uniform film can be obtained and the burden is large. The polypropylene resin may also be used in combination with known additives without hindering the present invention. As the additive, for example, an external absorbent, an antistatic agent, a lubricant, a nucleating agent, an antifogging agent and the like can be mentioned. The antioxidant is, for example, a phenolic antioxidant, a sulfur-based antioxidant, a hindered amine-based light stabilizer, or the like, and a composite antioxidant having a ruthenium-based antioxidant mechanism and a phosphorus-based unit in one molecule. Examples of the ultraviolet absorbing agent include a 2-hydroxybenzophenone-based or hydroxyphenylbenzotriazole-based agent, and a benzoate-based ultraviolet blocking agent. Any of an antistatic agent type, an oligomer type, and a monomer type. As a slip agent, a higher fatty acid such as guanamine or oleic acid amide, guanamine, stearic acid, or a salt thereof. The nucleating agent may, for example, be a nucleating agent such as a sorbent, an organic phosphate nucleating agent or a polyvinylcycloalkane. As the anti-blocking agent, a spherical shape or an approximation thereof can be used, regardless of whether it is an inorganic or organic system. These added species. &lt; Raw material film of polyacrylic resin> The polypropylene resin can be formed into a film by any method, and the film of the original material is transparent and substantially free of in-plane retardation. The melt measured in the example is suitable, and the MFR does not cause the range of the extruded fruit. The oxidizing agent, the purple agent, and the anti-adhesion phosphorus are also antioxidant, and the anti-oxidation mechanism can also be used, for example, ultraviolet absorption can be used. Examples of the polymer include a high-density sugar-based nucleating polymer-based microparticle-based multi-material film. For example, a polypropylene resin which can obtain an in-plane retardation by a melt-molding method of auto-dissolving -17-201001027, a resin plate which is dissolved in an organic solvent, and a solvent casting method for removing a solvent Raw material film. As a method of manufacturing a raw material film, a film forming method for closing molding will be described in detail. The polypropylene resin is melted and kneaded in an extruder, and is extruded into a sheet shape from the T die table. The temperature of the melted solution is 180 to 300 °C. At this time, if the temperature of the melted sheet is insufficient, the ductility may be insufficient, and the resulting film may have an uneven thickness and an uneven film. In addition, if the temperature exceeds 300 ° C, the grease deteriorates or decomposes, bubbles may occur in the sheet, or the carbide-containing extruder may be a single-axis extruder or a twin-shaft extruded single-axis extruder. The screw length L and the diameter DI 24 to 36 can be used, and the ratio of the space volume of the thread groove in the space measuring portion of the thread groove in the resin supply portion (the former/the latter) is 1.5 to 4 degrees, and has full thread (Full Flight). A screw that resists the style of the Maddock-type kneading part. In the case of deterioration or decomposition of the resin, the L/D of the uniformly melted kneading is about 28 to 36, and the compression ratio is 2.5 to 3.5. Further, in order to suppress deterioration of the polypropylene resin as much as possible, it is preferred to use a nitrogen atmosphere or a vacuum in the press. Further, in order to remove volatile gases which are degraded or decomposed by the resin, it is also suitable to provide an outlet having a diameter of 1 to 5 mm at the end to increase the pressure of the resin. The so-called extrusion end pressure of the outlet means increasing the back pressure of the tip, thereby increasing the pressure of the extruded fat to be flat to substantially no melted sheet by the rotation of the extrusion screw: less than 18 0 °C becomes a phase difference and easily causes a tree press. For example, the ratio of the volume of the spoon to the L/D is the ratio of the volume to the compression ratio of the resin, and then the polypropylene system is used to separate or decompose the separator by using a split screw, and the leading end portion of the extruder is extruded. Resin stability. It is advisable to use -18-201001027 for the diameter of the outlet to be 2~4mm. The T-die used for extrusion is preferably one in which the surface of the channel of the resin is not slightly damaged or damaged. In addition, the edge portion is plated or coated with a material having a small coefficient of friction with the molten polypropylene resin. It is advisable to honing the apex of the rim to a sharp edge shape with a diameter of 0 · 3 mm or less. Examples of the material having a small coefficient of friction include tungsten carbide (Tungsten Carbide) or fluorine-based special plating. By using such a T-die, the resin deposition can be suppressed and the mold line can be suppressed, so that a resin film excellent in appearance uniformity can be obtained. This die table has a multi-manifold (m a n i f 〇 1 d) as an outer coat hanger shape' and satisfies the following condition (A) or (B), and further satisfies the condition (C) or (D). • Condition (A): When the edge width of the T die table is less than 1500 mm, the thickness of the T die table is >180 mm, • Condition (B): When the edge width of the T die table is l5〇Omm or more, T Length in the thickness direction of the die table &gt; 22 0mm, • Condition (C): When the edge width of the T die table is less than 1500 mm, the height of the T die table is >250 mm, • Condition (D): T die table When the width of the rim is 1 500 mm or more, the length of the T-die table is 280 mm. By making the T die table that satisfies such conditions 'because the flow of the molten polypropylene resin inside the T-mold-19-201001027 can be adjusted', and the thickness can be suppressed from being pressed at the edge portion, A raw material film having more excellent thickness precision and a more uniform phase difference can be obtained. Further, from the viewpoint of suppressing the change in the extrusion of the polypropylene resin, it is preferred to mount the piston pump between the extruder and the τ die table by means of an adapter. Further, in order to remove foreign matter in the polypropylene resin, it is preferred to install a leaf disk filter. A molten sheet metal-derived cooling roll (also referred to as a cooling roll or a casting roll) extruded from a T-die, and a contact roll containing an elastic body that is pressed and rotated in the circumferential direction of the metal cooling roll It is cooled and hardened by crimping to obtain a desired film. In this case, the contact roller may be directly formed into the surface by an elastic body such as rubber, or may be formed by a metal sleeve to cover the surface of the elastomer roller. When the contact roll covered with the outer tube by the metal sleeve is used, the molten sheet of the polypropylene resin is usually sandwiched between the metal cooling roll and the contact roll to be cooled. On the other hand, when a contact roll having an elastomer surface is used, it may be sandwiched between the melted sheet of the polypropylene resin and the contact roll via a biaxially stretched film of the thermoplastic resin. Regarding the above-described molten sheet in which the polypropylene resin is sandwiched between the cooling roll and the contact roll, the cooling-hardening-cooling roll and the contact roll are both required to lower the surface temperature in advance to rapidly cool the molten sheet. For example, the surface temperature of the two rolls is preferably adjusted to a range of 0 to 30 °C. When the surface temperature exceeds 3 〇 °C, the cooling of the molten sheet takes time, so that the crystal component in the polypropylene resin grows, and the obtained film is -20-201001027. The surface temperature of the roll is preferably 3 Torr or less, and is preferably 25 ° C or less. On the other hand, when the surface temperature of the roll is lower than 〇 ° C, the surface of the metal chill roll is dew condensation, and water droplets adhere to each other, which tends to deteriorate the appearance of the film. When the metal chill roll is used, the surface state is transferred to the surface of the polypropylene resin film, and when the surface has irregularities, there is a possibility that the thickness precision of the obtained polypropylene resin film is lowered. Therefore, the surface of the metal cooling roll is preferably in a mirror state. Specifically, the thickness of the surface of the metal cooling roll is expressed by a standard series of maximum heights, preferably 〇 3 s or less, and more preferably 0.1 to 0.2 s. Forming a metal chill roll and a contact roller of the nip portion, the surface hardness of the elastomer is measured by a spring-type hardness test (type A) specified in JIS K 6 3 0 1 to 65 to 8 (TC is Preferably, it is preferably 70 to 80 ° C. By using such a rubber roller having a surface hardness, it is easy to uniformly maintain the linear pressure applied to the molten sheet, and between the metal cooling roll and the contact roll, It is easy to form a film without forming a bump of a molten sheet (resin deposition). The pressure (linear pressure) at the time of pinching a molten sheet is determined by pressing a pressure of a contact roll against a metal cooling roll. It is preferably 50 to 3 OON/cm, and more preferably 10 0 to 2 5 ON/cm. By pressing the wire within the above range, no bump is formed, and it is easy to manufacture while maintaining a constant line pressure. A polypropylene film is a resin film. When a molten film of a polypropylene resin and a biaxially stretched film of a thermoplastic resin are sandwiched between a metal cooling roll and a contact roll, the heat of the 2-axis extended film is formed. Plastic resin system as long as it does not adhere to polypropylene The resin to be melted may be exemplified by polyacetic acid, polychlorinated silicon, polyethyl alcohol, ethyl b-ethyl alcohol copolymer, etc. In this case, the dimensional change is small due to humidity or heat. At this time, the thickness of the biaxially stretched film is usually 5 to 50 μm, which is preferable. In this method, the distance between the edge of the die table and the metal cooling light (air gap (airga ρ )) is 200 mm or less is preferably 1 60 mm or less. The interval from the molten rim to the roll extruded from the T die table is prolonged, and the alignment is likely to occur. If the air gap is short, a film having a small alignment can be obtained. The gap is determined by the diameter of the metal cooling roll to be used and the shape of the tip end of the diameter of the contact roll, and is usually 50 mm or more. The processing speed at the time of producing the polypropylene resin film by this method is required to cool the solidified molten sheet. When the diameter of the cooling roll is increased, the molten sheet and the cooling roll become longer and can be manufactured at a higher speed. Specifically, when a metal cooling roll of 60 mm is used, the processing speed will be high. The maximum is 5 degrees. Metal The cooling is lightly cooled and solidified by contact with the melted sheet roll which is pressed by the light contact. Then, if necessary, the end portion is taken up and wound up on a coiler to form a film. At this time, the film is used to protect the surface. The surface protective film formed of other resin may be wound on the one side or both sides. The polypropylene resin is preferably the amine or the polyacrylonitrile ester. 1 〇~3 0 μ m Preferably, the film is from the lower limit of the above-mentioned shrinkage, and the degree of use is from the metal used for the contact diameter of ~20 m / min by the formation of cracks, the thermal plasticity Resin -22- 201001027 The molten sheet is simultaneously bonded to the biaxially stretched film formed of thermoplastic resin. When the metal chill roll and the contact roll are sandwiched, the biaxially stretched film can also be used as the surface protection of one side. film. &lt;Manufacturing method of retardation film&gt; The raw material sheet is stretched to exhibit a phase difference as a retardation film. The present invention is characterized in that it exhibits biaxiality by biaxial stretching or lateral stretching, and becomes a retardation film. In the case of transverse stretching, the retardation axis is expressed in the transverse direction of the film. On the other hand, the successive phase axes can be expressed in the transverse direction of the film or on the longitudinal surface. (1) Manufacturing method of sequential biaxial stretching The retardation film of the present invention can be produced by sequential biaxial stretching. The successive biaxial stretching is usually carried out by longitudinal stretching and then horizontally extending, but it is also possible to perform longitudinal stretching after lateral stretching. (Longitudinal Extension) As a longitudinal stretching method, a method of stretching a raw material film by a difference in rotation speed of two or more rolls or a long-span (1 〇 n g s p a η) stretching method may be mentioned. The long span method is a method in which a pair of nip rolls and a longitudinal stretching machine with an oven are used to heat the raw material film in the oven and extend by the difference in rotational speed between the two pairs of pinch wheels. In order to obtain a phase difference film having high optical uniformity, a long span method is preferred. In particular, it is advisable to use an air-floating oven. In the air floating oven, when the raw material film is introduced into the oven, hot air can be blown from the upper nozzle and the lower nozzle on both sides of the raw material film. A plurality of upper nozzles and lower nozzles are alternately disposed in the film transport direction. In the oven, the raw material film is extended without contacting any of the above-mentioned upper -23-201001027 square nozzle and the lower nozzle. The elongation temperature at this time (i.e., the ambient temperature in the oven) is 90 ° C or more, and the melting point of the polypropylene resin is preferably below. When the oven is divided into 2 or more areas, the temperature setting of each zone may be the same or different. The longitudinal stretching ratio is not particularly limited, but is usually 1 to 3 times, and is preferably 1.0 to 5 times to obtain a retardation film excellent in optical uniformity of the present invention. (Horizontal extension) Horizontal extension usually has the following three steps. (A) Preheating step: a step of preheating the raw material film at a preheating temperature near the melting point of the polypropylene resin' (B) Extension step: the preheated film is lower than the aforementioned preheating temperature The step of extending the temperature for lateral extension '(C) Thermal fixing step: a step of thermally fixing the laterally stretched film'. As a representative method of lateral stretching, a Tenter Process can be cited. The flat film method will fix the raw material film at both ends of the width direction of the film with a chuck, and enlarge the gap between the chucks in the oven _ for the extension of the / / 方 方 方 方 方 ' : : : : : : : : : : : : : : : The film stretching machine generally has a mechanism for independently adjusting the respective temperatures in the step of performing the preheating step 1 and the step of introducing the heat setting step. When the transverse stretching is performed by using such a flat film stretching machine, the difference in the precision of the shaft can be obtained, and the preheating step of the phase difference of the uniform phase difference is set before the step of stretching the film in the width direction. The step of stretching the film to heat the film to a sufficient temperature. Pre-24-201001027 The preheating temperature of the thermal step refers to the ambient temperature in the preheating step zone of the oven. The temperature near the melting point of the stretched polypropylene resin film is used. The residence time of the stretched film in the preheating step is preferably from 3 Torr to 120 seconds. If the residence time of the preheating step is less than 30 seconds, the applied stress will be uneven when the stretching step is extended, which may adversely affect the axial precision or the phase difference uniformity of the retardation film. In addition, if the residence time exceeds 12 seconds, the acceptance of more than the required heat, the film partially melts, and there is a possibility of drawdown (lower down). The residence time of the preheating step is preferably from 30 to 60 seconds. The step of extending the transverse extension is the step of stretching the film in the width direction. The extension temperature of this extension step is usually carried out at a temperature lower than the preheating temperature. The extension temperature of the extension step refers to the ambient temperature of the extended step zone of the oven. By extending the preheated film at a temperature lower than the preheating step, the film can be uniformly stretched. This result is a retardation film having a retardation axis and excellent phase difference uniformity. The extension temperature is preferably 5 to 20 ° C lower than the preheating temperature in the preheating step, and preferably lower at 7 to 15 ° C. The stretching ratio at this time is preferably in the range of 1.1 to 10 times the direction in which the slow phase axis is expressed, and may be appropriately selected in accordance with the required phase difference 値' to be in the range of 1.1 to 8 times. By setting the stretching ratio at this time to 1/3 or more, the aforementioned Nz coefficient can be in the range of 1.1 to 1.9. On the other hand, if the stretching ratio is too large, there is a possibility that the uniformity of the phase difference 损害 is impaired, so it is preferable to stop it at a level of 1 〇. The laterally extending heat setting step is a step of maintaining the film width at the end of the stretching step to pass the film through a prescribed temperature zone in the oven. For the effective -25-201001027 to enhance the phase difference of the film or the stability of the optical characteristics such as the slow phase axis 'The heat-fixed temperature is lower than the extension temperature in the extension step by 5 至 to a temperature 30 ° C higher than the extension temperature. The inside is appropriate. The step of lateral extension may have a thermal mitigation step. This heat relaxation step is usually carried out in the flat film method between the stretching step and the heat fixing step. The heat relaxation zone is independent of the other zones, and the settable temperature is a general rule. Specifically, the 'heat relaxation step is after the extension step is extended to the width of the ruler'. To remove the unnecessary skew, only the gap between the chucks is reduced by a few %, which is usually smaller than the interval at the end of the extension 〇 5 to 7%. . (2) Manufacturing method by lateral stretching When the retardation film of the present invention is produced by lateral stretching, the same method as that of the above-described sequential biaxial stretching as the lateral extension can be employed as the method. &lt;Optical characteristics when used as a 1/4 wave plate&gt; The phase difference film of the present invention is preferably used as a 1/4 wave plate having biaxial properties. Here, the 1/4 wave plate system having biaxiality has an elliptically polarized light which is converted by linearly polarized light into an elliptically polarized light including circularly polarized light. In addition, light conversion by elliptically polarized light including circularly polarized light is incident. The function of linearly polarized light, which is separately converted and emitted, has the function of compensating for the viewing angle of the liquid crystal in the unit cell. At this time, the in-plane phase difference 値R〇 of the retardation film of the present invention is in the range of 70 to 200 nm, and the ellipticity and the long-axis azimuth of the elliptically polarized light are obtained. Within the range of 17 〇 nm is appropriate. Further, the N z coefficient of the retardation film of the present invention is in the range of 1 · 1 to 2, and it is preferable that it is within the range of 1.4 to 1. 8 -26 to 201001027. The in-plane retardation 値R 〇 and N z coefficients of the retardation film of the present invention are appropriately selected from the above range to match the viewing angle characteristics required for the liquid crystal display device to be used. Further, the standard deviation of the retardation axis angle of the retardation film of the present invention which is suitable for use as a biaxial 1/4 wave plate is below </ ̄> 58 ° or less, especially 0.55 ° or less, and is positively contrasted. The point of view is suitable. &lt;Elliptical Polarizing Plate&gt; By using the retardation film of the present invention as a 1/4 wave plate, laminating with a linear polarizing plate at a predetermined axial angle, or simultaneously with a 1 /2 wave plate The axial angle is laminated with a linear polarizing plate to obtain an elliptically polarizing plate. The present invention provides an elliptically polarizing plate obtained by laminating the above-described retardation film of the present invention on a linear polarizing plate. Here, Fig. 1(a) schematically shows a cross-sectional view of an elliptically polarizing plate 1 which is a suitable example of the present invention, and Fig. 1(b) is a view for explaining the axial angle of the elliptically polarizing plate 1 shown in Fig. 1(a). Diagram of the relationship. An elliptically polarizing plate 1 as an example of the present invention has a structure in which a quarter-plate 2 made of the retardation film of the present invention described above is laminated on a linear polarizing plate 3, as shown in Fig. 1(a). At this time, as shown in Fig. 1(b), with respect to the absorption axis 7 of the linear polarizing plate 3, the rotation direction in the counterclockwise direction is positive, and the angle 0 of the slow phase axis 6 disposed in the plane of the 1M wave plate 2 becomes 40~ 50. (Approx. 4 5°), operating as a near-circular polarizer. Or, based on the absorption axis 7 of the linear polarizing plate 3, the rotation direction in the counterclockwise direction is positive, and the angle 0 of the slow phase axis 6 disposed in the plane of the 丨/4 wave plate 2 becomes 130 to 140. (Approx. 1 3 5 °)) Still operating as a near-circular polarizer. The latter relationship (the angle from the absorption axis of the linear polarizer to the in-plane slow axis of the 1/4 wave plate becomes -27-201001027 130~140°) is equivalent to the reference symbol 7 in Figure 1(b). Read as the state of the "transmission axis of the linear polarizer". Regarding the linear polarizing plate, the absorption axis and the transmission axis are perpendicular to each other in the plane. Hereinafter, when the angle is expressed, the counterclockwise rotation is positive for the reference axis as in the description herein. Further, the present invention also provides an elliptically polarizing plate in which a retardation film which operates as a 1/2-wave plate is disposed between the retardation film of the present invention which operates as a quarter-wave plate and the linear polarizing plate. Here, Fig. 2(a) schematically shows the cross-sectional circle of the elliptically polarizing plate 11 of another example suitable for the present invention, and Fig. 2(b) is for explaining the axis of the elliptically polarizing plate 11 shown in Fig. 2(a). Angle diagram. Another example of the elliptically polarizing plate 1 1 suitable for the present invention is a structure in which the 1/4 wave plate 12 is laminated on the linear polarizing plate 3, as shown in Fig. 2(a). In such a structure, the laminate of the 1 /2 wave plate 1 2 and the 1/4 wave plate 2 can operate in a wide wavelength range in the visible light region, that is, as a 1 / 4 wave plate in the wide frequency region, and the laminated linear polarizing plate The elliptically polarizing plate 11 shown in Fig. 2(a) on the side of the 1 / 2 wave plate 12 is capable of converting linear polarization into circularly polarized light in a wide frequency region, and converting circularly polarized light into linearly polarized light. Further, by such a configuration, the angle dependency of the antireflection effect can be reduced. At this time, as shown in Fig. 2(b), the angle φ of the 1/2 wave plate 12 to the in-plane retardation axis 13 is 10 to 20° based on the absorption axis 7 of the linear polarizing plate 3 (at about 15°). Preferably, the angle Ψ of the in-plane retardation axis 6 of the in-plane slow-phase axis 13 to 1/4 wave plate 2 of the in-plane of the 1/2 wave plate 12 is 55 to 65° (preferably about 60°). Operates as a near-circular polarizer. Or based on the absorption axis 7 of the linear polarizing plate 3, the angle φ -28- 201001027 of the 1 /2 wave plate 1 2 to the in-plane retardation axis 1 3 is 100 to 1 10° (about 105°). The angle ψ of the in-plane slow phase axis 6 of the in-plane slow-phase axis 13 to 1/4 wave plate 2 from the 1/2 wave plate 12 is 55 to 65° (suitable at about 60°). The circular polarizer operates. The latter relationship (from the absorption axis of the linear polarizer to the angle of the slow phase axis of the 1 / 2 wave plate becomes 100 to 110 °) is equivalent to the reference symbol 7 in Fig. 2 (b) is also read as "linear The state of the transmission axis of the polarizing plate. Regarding the linear polarizing plate, the absorption axis and the transmission axis are perpendicular to each other in the plane. Further, as the 1 / 2 wave plate used in the elliptically polarizing plate n of the present invention shown in Fig. 2 (a), for example, carbonate, polyvinyl alcohol, polystyrene, polymethyl ketone are used. A film of a thermoplastic resin such as a polyacrylate such as a acrylate or a polypropylene, a norbornene, a polyarylate, or a polyamidomine is stretched. Among them, in terms of comparison, polypropylene is preferred. Such a 1 /2 wave plate is manufactured by a suitable method such as uniaxial stretching or biaxial stretching, and the in-plane phase difference 値R 〇 is preferably in the range of 240 to 400 nm, and further preferably 260 to 330 nm. The range is especially good. When any of the transparent protective layers used in the linear polarizing plate 3 is shown in any of Figs. 1(a) and 2(a), for example, triethyl cellulose (TAC) which is conventionally used as a protective layer for a polarizing film can be used. Or a film of a phthalocyanine resin such as diethyl phthalocyanine, or a film of a cyclic polyolefin resin such as a norbornene resin, a film of a polypropylene resin, or a polyphenylene terephthalate. A film of a formic acid glycol resin, a film of poly(methyl) methacrylate, or the like. For the production of elliptically polarizing plates, the bonding wave plate and the polarizing plate can be used as an example -29- 201001027 such as a pressure sensitive adhesive (also an adhesive). As the pressure-sensitive adhesive, it is particularly preferable to use an acrylic polymer which is excellent in transparency and durability. The thickness of the pressure-sensitive adhesive is usually in the range of 5 to 50 μm. The elliptically polarizing plate having the above configuration is attached to the retardation film side of the present invention used as a biaxial 1/4 wave plate, and a pressure-sensitive adhesive (adhesive) is disposed so as to be adhered to the liquid crystal cell. This elliptically polarizing plate is laminated on at least one side of the liquid crystal cell to constitute a liquid crystal display device. The elliptical polarizing plate may also be disposed on both sides of the liquid crystal cell, and the elliptically polarizing plate may be disposed on one side of the liquid crystal cell, and the other side may be provided with other polarizing plates. The 1/4 wave plate of the biaxiality is attached to the liquid crystal cell, and is attached to the liquid crystal cell to make each other. &lt;Liquid Crystal Display Device&gt; The present invention further provides a liquid crystal display device in which the elliptically polarizing plate of the present invention is laminated on at least one side of a liquid crystal cell. Here, FIG. 3 is a cross-sectional view showing a liquid crystal display device 3 in which the elliptically polarizing plate 1 of the example shown in FIG. 1(a) is disposed on both sides of the liquid crystal cell 3, and FIG. 4 schematically shows a layout view. 2(a) is a cross-sectional view showing a liquid crystal display device 41 of an example in which the elliptically polarizing plate 11 is exemplified on both sides of the liquid crystal cell 32. 3 is a view showing an elliptically polarizing plate 1 in which a laminate of a 1/4 wave plate 2 and a linear polarizing plate 3 shown in FIG. 1(a) is passed through a pressure sensitive adhesive 33 and laminated under a liquid crystal cell 3 2 . On the side, and similarly, the pressure-sensitive adhesive 3 3 is also laminated on the upper side of the liquid crystal cell 3 2 . Further, at this time, the elliptically polarizing plate 1 is disposed on the side of the liquid crystal cell 3 2 on the side of the 1/4 wave plate 2, respectively. Further, each of the elliptically polarizing plates 1 is disposed so as to be perpendicular to the absorption axis of the linear polarizing plate 3 by -30 to 201001027. When the liquid crystal display device shown in FIG. 3 having such a configuration is used as the transmissive type semi-transmissive reflection type, it is disposed outside the elliptically polarizing plate on one side (the lower side of the elliptically polarizing plate disposed on the lower side of the example shown in FIG. 3). The backlight 34° is further shown in Fig. 4, and the elliptically polarizing plate 1 1 showing the laminate of the 1/4 wave plate 2 and the 1/2 wave plate 12 and the linear polarizing plate 3 is shown in Fig. 2(a). The adhesive 3 3 is laminated on the lower side of the liquid crystal cell 32, and similarly passes through the pressure-sensitive adhesive 33 to be laminated on the upper side of the liquid crystal cell 32. Further, at this time, the elliptically polarizing plate 11 is disposed on the side of the liquid crystal cell 3 2 on the side of the 1/4 wave plate 2, respectively. Each of the elliptically polarizing plates 11 is disposed perpendicular to the absorption axis of the linear polarizing plate 3. When the liquid crystal display device is used as the transmissive semi-transmissive reflection type, the backlight 34 is also disposed on the outer side (the lower side in the figure) of the elliptically polarizing plate on one side. &lt;Manufacturing Method of Elliptical Polarizing Plate&gt; The present invention further provides a suitable manufacturing method of the elliptically polarizing plate shown in Fig. 1, and a suitable manufacturing method of the elliptically polarizing plate in Fig. 2 . The method of manufacturing the elliptically polarizing plate 1 in which the linear polarizing plate 3 and the 1/4 wave plate 2 are laminated as shown in Fig. 1 has the following steps. • A linear polarizing plate in which the absorption axis is parallel or perpendicular to the longitudinal direction of the film, and the direction in which the longitudinal direction of the film is set at an angle is sequentially cut to obtain a parallelogram-cutting step (polarizing plate cutting step), • Made of a polypropylene resin, the in-plane phase difference 値R〇 is in the range of 70 to 20 〇 nm, and the Nz coefficient defined by the above formula (1) is in the range of 1.1 to 2, and is less than 1 mm. The standard deviation of the retardation axis angle measured by the interval is -31 - 201001027 and the difference is 0.6. Hereinafter, the retardation axis is a parallel or vertical 1/4 wave plate in the longitudinal direction of the film, and is fed from the roller to the bonding device (1/4 wave plate sending step), and the cut body and the aforementioned 1 are /4 wave plate 'The two sides of the cut body are cut in parallel and are parallel to the both side edges along the longitudinal direction of the 1/4 wave plate'. The step of bonding by the above-mentioned bonding device (sticking step) On the other hand, the method of manufacturing the elliptically polarizing plate 11 of the structure in which the linear polarizing plate 3 and the 1/2 wave plate 1 2 and the 1/4 wave plate 2 are laminated in this order as shown in FIG. 2 has the following step. • A linear polarizing plate in which the absorption axis is parallel or perpendicular to the longitudinal direction of the film, and the direction of the longitudinal direction of the film is set to an angle, and the step of obtaining a parallelogram cut-out body (polarizing plate cutting step) is sequentially cut. • A step of sending a 1 /2 wave plate of the retardation axis parallel or perpendicular to the longitudinal direction of the film from the roll to the first bonding device (1/2 wave plate sending step) by the thermoplastic resin. The cut body and the 1/2 wave plate are arranged such that two sides of the cut body are cut in parallel and are parallel to both side edges along the longitudinal direction of the 1 / 2 wave plate. Performing the bonding step (1 /2 wave plate bonding step)' • The direction in which the tangent body and the 1/2 wave plate are bonded to each other in the direction of the longitudinal direction of the film is sequentially cut off to obtain a parallel Step of cutting out the quadrilateral (adhesive cutting step), • made of polypropylene resin, the in-plane phase difference 値R() is in the range of 7 〇 to 200 nm, Nz defined by the above formula (1) The coefficient is in the range of 1 · 1 to 2, and the standard deviation of the retardation axis angle measured at intervals of 1 mm or less - 32 - 201001027 The difference is 0.6. Hereinafter, the step of the second phase of the film in which the retardation axis is parallel or perpendicular to the longitudinal direction of the film is sent from the roller to the second bonding device (1/4 wave plate feeding step), and the above-mentioned bonding body is cut. The body and the 1/4 wave plate 'the two sides of the cut body of the bonded body are cut in parallel and at a set angle along both side edges of the longitudinal direction of the 1/4 wave plate, and the second bonding device The step of bonding (1 / 4 wave plate bonding step). The elliptically polarizing plate 1 having the structure in which the linear polarizing plate 3 and the 1/4 wave plate 2 are laminated as shown in FIG. 1 may be cut at a predetermined angle by, for example, a 1/4 wave plate 2 supplied in a roll shape. This is bonded to the linear polarizing plate 3 which is also supplied in a roll shape, and the angle between the absorption axis 7 of the linear polarizing plate and the retardation axis 6 of the quarter-wave plate is set to the above range. However, the biaxially oriented retardation film made of a polypropylene-based resin of the present invention used as a quarter-wave plate can be formed by cutting a phase difference film having such a small thickness by forming an extremely thin 20 μm. When it is a predetermined size, the hardness is weak, and the operation when it is attached to a linear polarizing plate is not good. Therefore, in such a case, when the linear polarizing plate is cut at a predetermined axial angle, it is effective to bond it to a 1/4 wave plate supplied in a thin roll shape. The elliptically polarizing plate 11 having the structure of laminating the linear polarizing plate 3 and the 1 /2 wave plate 12 and the 1/4 wave plate 2 in this order as shown in FIG. 2 can also similarly apply the linear polarizing plate 3, 1 /2 wave plate. Any one of the 1 2 and 1 / 4 wave plate 2 is cut at a predetermined angle. 'It is attached to one of the remaining two materials, and after being cut again, it is attached to the roller at a predetermined angle. Made by another method of material. However, if the invention can be used to cut the 1/4 wave plate made of polypropylene resin, the hardness is weak, 1 /2 wave plate, or 1 /2 wave plate. The operation of the sheet side of the linear polarizing plate was not good. Therefore, the state in which the relevant 1/4 wave plate is supplied is effective in the method of laminating the pre-cut linear 1 / 2 wave plate laminate. In the above method for manufacturing an elliptically polarizing plate according to the present invention, the absorption axis is cut in the direction of the longitudinal direction of the linear polarizing film parallel or perpendicular to the longitudinal direction of the film, and is sequentially cut to obtain the edge-cut body. The polarizing plate is cut out. Here, Fig. 5 is a view showing a linear polarizing plate in the method of manufacturing the elliptically polarizing plate of the present invention. First, referring to Fig. 5, the polarizing plate cutting step will be described. As shown in Fig. 5, in the polarizing plate cutting step, the linear polarizing plate 3 whose absorption axis is parallel or perpendicular to the thin direction is usually supplied with a long side. Specifically, the long-side linear polarizing plate 3 is fed from the roller 52 in the direction 53 and sent to the cutter 50 which is cut at a set angle 54 in the longitudinal direction. The linear polarizing plate 3 sequentially obtains the parallelogram cut-out body 5 5 by the cutter 50. When the elliptically polarizing plate 1 having the structure in which the wire plate 3 and the 1/4 wave plate 2 are laminated as shown in FIG. 1 is manufactured, the description shows that the setting angle 54 is 40 to 50° (at about 45°; on the other hand, As shown in FIG. 2, the elliptically polarizing plate 1 of the structure in which the linear polarizing plate 3 and the 1/2 wave household 1 Μ wave plate 2 are laminated in this order is as shown in the above description, and the setting angle 54 is 10 to 20° (about It is preferable to manufacture a linear polarizing plate 3 and a 1/4 wave plate 2 as shown in Fig. 1 to be bonded to a 1/2 wave system, and to have a plate with a roller plate and a pair of plates, which are shown in parallel with the step of the film. Cut in the direction, sexually polarized, as appropriate. * At 12 o'clock, when the elliptically polarizing plate 1 of the structure of -34 - 201001027 is still laminated, the polarizing plate cutting step is followed by the 1/4 wave plate sending step and the bonding step described above. Here, Fig. 6 is a view schematically showing a 1/4 wave plate feeding step and a bonding step in the method of manufacturing the elliptically polarizing plate of the present invention. As shown in Fig. 6, the 1/4 wave plate 2 made of the retardation film of the present invention in which the retardation axis is parallel or perpendicular to the longitudinal direction of the film is usually supplied in the form of a long-side roll. Specifically, the roller 6 2 is sent out of the feeding direction 63 and sent to the bonding device 60. The cut-out body 55 obtained by the polarizing plate cutting step is formed such that the two sides 55a which are cut in parallel are parallel to the rain side edge along the longitudinal direction of the quarter-wave plate 2, and are sent out in the sending direction 6 4 and sent to Bonding device 60. Next, in the bonding apparatus 60, the quarter-wave plate 2 and the cut-out body 55 of the long side are bonded together to form the elliptically polarizing plate 1. The bonding device 60 can be generally constructed of two rolls. Here, the cut-off body 5 5 and the 1/4 wave plate 2 are bonded together, and usually an adhesive layer is provided in advance on the surface of the linear polarizing plate which becomes the cut-off body 5 (the bonding surface to the 1 / 4 wave plate 2) ), carried out in the adhesive layer. The adhesive layer is usually applied to the surface of the release film which is temporarily attached to the surface until adhesion, and the release film is peeled off from the adhesive layer before the cut body 55 is sent to the bonding apparatus 60. The elliptically polarizing plate 1 thus obtained is obtained by cutting a quarter-wave plate which is outside the cut-out body 55 of the linear polarizing plate, and cuts it into a predetermined shape (usually a rectangular shape) to supply a product bonded to the liquid crystal cell. Here, Fig. 7 is a view showing a concrete example of the case where the elliptically polarizing plate 1 having the structure in which the linear polarizing plate 3 and the quarter-wave plate 2 shown in Fig. 1 are laminated is formed. In the example shown in Fig. 7, first, as shown in Fig. 7(a), regarding the absorption -35-201001027, the axis 7 is parallel to the longitudinal direction of the film, and the linear polarizing plate (roller 5 2) is disposed at an angle of 54 in the longitudinal direction of the film. At 45, it was cut in order, and a parallelogram cut-out body 55 was obtained. Then, as shown in Fig. 7(b), the cut body 55 is rotated by 4 5°, and the state is as shown in Fig. 7(c), and the retardation axis 6 is perpendicular to the longitudinal direction of the film by 1/4 wave plate. (Roll 6 2 ), bonded by a bonding device. In this way, it is suitable to manufacture, for example, the absorption axis 7 of the linear polarizing plate 3 as shown in FIG. 1(b), and the rotation direction in the counterclockwise direction is positive, and the retardation axis 6 is disposed in the in-plane of the 1/4 wave plate 2. The angle Θ becomes 45° as an elliptically polarizing plate in which a near-circular polarizing plate operates. On the other hand, when the elliptically polarizing plate 1 having the structure in which the linear polarizing plate 3 and the 丨/2 wave plate 1 2 and the 1/4 wave plate 2 are sequentially laminated as shown in FIG. 2 is manufactured, it is explained with reference to FIG. The polarizing plate cutting step passes through the above-mentioned 1 / 2 wave plate feeding step '1 /2 wave plate bonding step, the bonded body cutting step, the 1 / 4 wave plate feeding step, and the 1 / 4 wave plate bonding step. Here, Fig. 8 is a view schematically showing a 1/2 wave plate feeding step and a W2 wave plate bonding step in the method of manufacturing the elliptically polarizing plate of the present invention. Fig. 8 is a 1 / 2 wave plate 12 made of a thermoplastic resin in which the retardation axis is parallel or perpendicular to the longitudinal direction of the film, and is supplied in a long-side roll shape from the roll 7 2 to the delivery direction 73, and is sent Go to the first bonding device 7〇. On the other hand, the cut body 55 obtained by the polarizing plate cutting step described with reference to Fig. 5 is the two sides 55a which are cut in parallel and the 1/2 wave plate 12 which is the long side which is sent along the above-mentioned roll 72. Both side edges in the longitudinal direction are sent to the first bonding apparatus 70 in parallel 'send in the delivery direction 74'. Then, in the first bonding apparatus 70, the 1⁄2 wave plate 1 2 and the cut body 5 5 ' to which the long side is bonded are bonded to the laminated body of the linear polarizing plate and the -36-201001027 1/2 wave plate. The first bonding device 70 can also be constructed by two rolls. The bonding body 55 and the 1/2 wave plate 12 are bonded together, and usually an adhesive layer is provided in advance on the surface of the linear polarizing plate which is the cut body 55 (the bonding surface to the 1 / 2 wave plate 12). The adhesive layer is carried out. The adhesive layer is usually applied to the surface of the release-protected release film until it is adhered, and the release film is peeled off from the adhesive layer before the cut-off body 55 is sent to the bonding apparatus 60. The bonded body 75 thus obtained is cut in the direction in which the longitudinal direction of the film is set to an angle, and is supplied to the bonded body cutting step of obtaining the parallelogram cut-out body. Although the drawing is omitted, the 1 /2 wave plate which is beyond the cut-out body 5 5 of the linear polarizing plate is cut away and cut into a parallelogram which is the same shape as the cut-out body 55. The cut-off body 76 of the bonded body 75 of the 1 / 2 wave plate is cut in the bonded body cutting step, and then supplied to the quarter-wave plate bonding step. Here, Fig. 9 is a view schematically showing a 1/4 wave plate feeding step and a quarter wave plate bonding step in the method of manufacturing the elliptically polarizing plate of the present invention. Fig. 9 is a 1/4 wave plate feeding step and a quarter wave plate bonding step. In the figure, the 1/4 wave plate 2 made of the polypropylene resin of the present invention in which the retardation axis is parallel or perpendicular to the longitudinal direction of the film is supplied in the form of a long edge, and is fed from the roller 62 to the delivery direction 63. The sample is sent to the second bonding device 80. On the other hand, the cut-off body 76 of the bonded body 75 of the linear polarizing plate and the 1 / 2 wave plate cut in the bonding body cutting step is oriented such that the W2 wave plate side faces the quarter-wave plate 2, and the cutting is prescribed. The side 86 is set at an angle 87 with the side edge -37-201001027 along the longitudinal direction of the quarter-wave plate, and is sent to the second bonding apparatus 80 in the delivery direction 84'. When the elliptically polarizing plate of the shaft arrangement shown in Fig. 2(b) is produced, the setting angle 87 is 10 to 20° (preferably about 15°). Next, in the second bonding apparatus 80, the cut-off body 76 of the bonded body of the linear polarizing plate and the 1/2 wave plate is bonded to the quarter-wave plate 2 of the long side to form the elliptically polarizing plate 11 . The second bonding device 80 can also be constructed by two rolls. Here, the cut-off body 76 of the bonded body 7 5 to which the linear polarizing plate and the 1 / 2 wave plate are bonded is in the 1/4 wave plate 2, and the adhesive layer is usually provided in advance to the cut-out body 76 of the bonded body 75. The 1/2 wave plate side surface (the bonding surface to the 1/4 wave plate 2) is bonded to the W4 wave plate 2 via the adhesive layer. The adhesive layer is usually applied to the surface of the adhesive film to be adhered to the second bonding device 80, and the release film is peeled off from the adhesive layer. . The elliptically polarizing plate 11 obtained in this manner is obtained by cutting a quarter-wave plate around the cut-off body 76 of the bonded body 75 of the linear polarizing plate and the 1 / 2 wave plate, and cutting it into a predetermined shape (usually a rectangular shape) to supply For bonding to a liquid crystal cell. Here, FIG. 1 shows the stage of manufacturing the elliptically polarizing plate 1 having the structure in which the linear polarizing plate 3 and the 1/2 wave plate 12 and the 1/4 wave plate 2 are laminated in this order. A specific example of the figure. In the example shown in Fig. 1, first, as shown in Fig. 10(a), with respect to the linear polarizing plate (roller 5 2) in which the absorption axis 7 is parallel to the longitudinal direction of the film, the setting angle 5 4 of the longitudinal direction of the film is 1 5 . °, cut in order, to obtain a parallelogram cut out body 5 5 . Next, as shown in Fig. 10(b), the cut body 55 is rotated by 75°, and in this state, as shown by -38-201001027, Fig. 10(c) shows that the retardation axis 13 is perpendicular to the longitudinal direction of the film. 2 Wave plates (rollers 72) were attached by a first bonding device. The obtained bonded body 75 was directly cut out from the cut-out body 5 5 to obtain a cut-out body 76 of the bonded body 75, which was rotated by 60° as shown in Fig. 10 (d). In this state, as shown in Fig. 10(e), the W4 wave plate (roller 62) having the retardation axis 6 perpendicular to the longitudinal direction of the film is bonded by the second bonding apparatus. In this way, for example, it is suitable to manufacture the absorption axis 7 of the linear polarizing plate 3 as shown in FIG. 2(b), and the angle Θ of the in-plane slow axis 13 disposed in the in-plane of the 1/2 wave plate 12 is 15°. The in-plane slow-phase axis of the 1/2 wave plate 12 is 13 to 1/4. The angle Ψ of the retardation axis 6 in the in-plane of the wave plate 2 becomes 60° as an elliptically polarizing plate in which the near-circular polarizing plate operates. [Embodiment] Hereinafter, the present invention will be described more specifically by way of examples, but the invention is not limited thereto. For example, % indicating the content is a weight basis unless otherwise specified. Further, the optical axis of the film was measured as follows. That is, using a small area automatic birefringence meter KOBRA-CCD/XY (manufactured by Oji Scientific Instruments Co., Ltd.), the direction of the slow phase axis is measured at intervals of 0.5 mm with respect to the portion of the 6 mm φ circle of the film surface. This measurement was performed at 1 薄膜 of the film, and the average slow axis direction was obtained, and the standard deviation was obtained. Further, the contrast ratio when the liquid crystal display device is used is the ratio of the brightness at the time of white display to the brightness at the time of black display. -39- 201001027 &lt;Example 1&gt; (a) Preparation of a 1/4-wave plate A propylene/ethylene random copolymer (manufactured by Sumitomo Chemical Co., Ltd.) containing about 5% of ethylene units was formed into a film to obtain a thickness of 10 Raw material film of 0 μm. This raw material film was longitudinally extended by a longitudinal stretching machine. The extension was first adjusted at a line speed of 3 m/min by preheating temperature 1 20 °C zone' followed by a temperature adjustment of 1 24 艽 zone extension. The extension is adjusted at a peripheral speed to double. Thereafter, the machine is horizontally extended by a flat film transverse stretching machine. The transverse extension was carried out at a line speed of 5 m / min by first adjusting the temperature to a preheating zone of 1 3 1 ° C and then adjusting the temperature to a temperature of 1 2 1 t to make the final stretching ratio 3.7 times. The obtained stretched film (retardation film) had an in-plane retardation 値R〇 of I40 nm, a phase difference Rth in the thickness direction of 150 nm, an Nz coefficient of 1.6, a wavelength dispersion of 1.00, and a film thickness of 16.8 μm. 1/4 wave film operator. Further, in the method described, the average enthalpy of the slow phase axis measured in micrometers is 0. 横, and the standard deviation of the slow phase axis is 0.52°. (b) Preparation of an elliptically polarizing plate, a structure in which a polarizing film of iodine mixed with iodine is adsorbed by two sheets of triacetyl cellulose film, and a linear polarizing plate having an acrylic pressure-sensitive adhesive layer is provided on the sheet surface ( SR-W062 sold by Sumitomo Chemical Co., Ltd.) On the other hand, the quarter-wave plate produced in (a) above is cut off from the 45-axis direction of the slow phase axis, and the integrated radiation amount is 1 68 0J on the single side. The condition is subjected to an electric discharge treatment, and within 30 seconds after the corona discharge treatment, the corona discharge treatment surface is bonded to the linear polarizing plate, and the acrylic pressure-sensitive adhesive is used as a rate. The thin layer is u. 刖延乙粘〇 0 halo layer -40- 201001027 side. At this time, the absorption axis of the linear polarizer and the slow phase axis of the 1/4 wave plate are arranged so as to intersect at an angle of 45 °. Thus, a W4 wave plate made of a propylene resin was laminated on an elliptically polarizing plate. (c) Measurement of the ellipticity of the elliptically polarizing plate The ellipticity of the elliptically polarizing plate produced in the above (b) was measured using a phase difference measuring device KOBRA-21ADH (manufactured by Oji Scientific Instruments Co., Ltd.). Here, the ellipticity is the ratio of the minor axis length to the long axis length of the elliptically polarized light emitted from the 1/4 wave plate side when light is incident from the linear polarizing plate side of the elliptically polarizing plate. The elliptical polarizing plate obtained in this example had an ellipticity of 0.93. (d) Evaluation of elliptically polarizing plate A commercially available mobile phone equipped with a liquid crystal display device of a semi-transmissive ASV (Advanced Super View) was taken out, and the liquid crystal display device was taken out to peel off the polarizing plate above and below the liquid crystal cell. Instead of the peeled polarizing plate, the elliptical polarizing plates obtained as described above were interposed between the pressure-sensitive adhesive and the polypropylene-based retardation film side. After the liquid crystal display device was assembled again, the backlight was lit, and the front side contrast was measured with a liquid crystal viewing angle measuring device EZ Contrast 1 60R (manufactured by ELDIM Co., Ltd.). The result is a positive comparison of 1 0 6 0. &lt;Example 2&gt; The same propylene/ethylene random copolymer (Sumitomo N〇brene W151, manufactured by Sumitomo Chemical Co., Ltd.) was used as the film to obtain a raw material film having a thickness of 100 μm. . This raw material film was longitudinally stretched by a longitudinal stretching machine. The longitudinal extension was first adjusted to a zone of 120 °C by a preheating temperature at a line speed of 3 m/min, and then extended to a zone of 124 °C at a temperature. Extension -41 - 201001027 The magnification is adjusted at the peripheral speed to double. Thereafter, the film was horizontally stretched with a flat film transverse stretcher. The transverse extension was first passed through a preheating zone where the temperature was adjusted to 133 °C at a line speed of 10 m/min, and then the temperature was adjusted to a temperature of 1 21 °C, and the final stretching ratio was 4 times. The obtained stretched film (retardation film) had an in-plane retardation 値R〇 of I44 nm, a phase difference 値Rth of 136 nm in the thickness direction, an Nz coefficient of 1.4, a wavelength dispersion of a phase difference of 1·00, and a film thickness of 14.5 μm. As a quarter wave carrier. &lt;Example 3&gt; The same propylene/ethylene random copolymer (manufactured by Sumitomo Chemical Co., Ltd.) was used to prepare a film of a raw material having a thickness of 80 μm. This raw material film was longitudinally extended by a longitudinal stretching machine. The longitudinal extension was first adjusted to a temperature of 120 °C by a preheating temperature at a line speed of 6 m/min, and then adjusted to a temperature of 1 24 at a temperature. (: zone extension. The extension ratio is adjusted by the peripheral speed to double. After that, the transverse extension is carried out by a flat film transverse stretcher. The transverse extension is first adjusted to a temperature of 1 3 5 by the line speed of 20 m/min. The preheating zone of °C is then adjusted to a temperature of 丨25t, and the final stretching ratio is three times. The obtained retardation film (phase difference film) has an in-plane phase difference 1 of 137 nm and a thickness direction. The phase difference 値Rth was 175 nm, the Nz coefficient was 1.8, the wavelength dispersion of the phase difference was 1.01, and the film thickness was 18.8 μm, which was used as a 1/4 wave plate carrier. &lt;Comparative Example 1 &gt; In-plane phase difference 値RQ, thickness was measured in the same manner as in Example 1 in the case of the phase of the 1/4 wave plate in which the norborne sheet-like resin was biaxially stretched-42-201001027. The phase difference of the directions 値 Rth, Nz coefficient, wavelength dispersion of the phase difference, and film thickness are shown in Table 1. Further, in the above method, the average enthalpy of the slow phase axis measured in units of micrometers is 〇. 1° in the lateral direction, and the standard deviation of the slow phase axis is 0.63°. An elliptical polarizing plate was produced in the same manner as in Example 1 except that this retardation film was used, and the ellipticity was measured in the same manner as in Example 1 for the elliptically polarizing plate. The ellipticity of the elliptically polarizing plate is 0.93. Further, a liquid crystal display device was assembled in the same manner as in Example 1 and evaluated. The result is a positive comparison of 1 022. The physical properties of the retardation film (1/4 wave plate) obtained in the above Examples 1 to 3 and the retardation film (1/4 wave plate) used in Comparative Example 1 are shown in Table 1. Further, the evaluation results of the elliptically polarizing plates produced in Example 1 and Comparative Example 1 are shown in Table 2. [Table 1] \ Phase difference film material extension morphology phase difference film physical properties R 〇 Rth Nz wavelength dispersion thickness standard deviation of the phase axis Example 1 polypropylene biaxial 140 nm 150 nm 1.6 1.00 16.8 μ m 0.52 ° Example 2 Polypropylene biaxial 144 nm 136 nm 1.4 1.00 14.5 μm Example 3 Polypropylene biaxial 137 nm 175 nm 1.8 1.01 18.8 μm _ Comparative Example 1 Norbornene biaxial 140 nm 154 nm 1.6 1.00 28.0 μ m 0.63° [Table 2] Phase difference film material extension ellipse fi light plate morphology ellipticity front contrast example 1 polypropylene double shaft 0.93 1060 Comparative example 1 ί 水 片 片 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 0.9 &lt;Example 4&gt; Since the roll of the long-side linear polarizing plate of the coating layer on the one side used in Example 1 (b) was temporarily protected by the peeling film, propylene was made upward and long. The edge-shaped linear polarizing plate is sent to the 45° cutting. Again, only 800 mm is sent, and the cut-out of the parallelogram is obtained. Next, 1/4 of the production of Example 1 (a) was continuously sent to the film bonding apparatus. At the same time, the two sides of the delivery body that are cut in parallel are paralleled to the long side, and the release film of the adhesive layer of the linear polarizing plate cut-off body is peeled off, and the device is attached to the device at a level of 1 〇 to 30 mm, and continuously obtained. The linear polarizing plate and the bonded body are fed from the cutting edge of the same cut-off body and cut away from the remaining 1/4 wave plate around the long-side body of the 1/4 wave plate to obtain a elliptically polarizing plate. The embodiments and examples disclosed herein are not intended to be limiting. The scope of the present invention is set forth in the foregoing description, and is intended to cover all modifications. [Simple description of the drawings] The surface of the acrylic pressure-sensitive adhesive layer is provided with an acid-based pressure-sensitive adhesive layer cutting machine, which is cut in the same manner as the long side, and the wave plate is repeatedly fed from the long side roller. The linear polarizing plate cuts out the interval between the acrylic pressure-sensitive adhesive layers formed on both sides of the 1/4 wave plate, and continuously feeds the laminated body to the 1/4 wave plate. When the linear polarizing film is cut along the linear polarizing film, the examples of the same performance of the first embodiment of the embodiment 1 should be considered as being within the meaning and scope of the application range - 44 - 201001027 [Fig. 1] Fig. 1(a) is a cross-sectional view schematically showing an elliptical polarizing plate 1 which is a suitable example of the present invention, and Fig. 1(b) is a view for explaining the relationship between the axial angles of the elliptically polarizing plate 1 shown in Fig. i(a). . 2(a) is a cross-sectional view schematically showing another example of an elliptically polarizing plate 11 suitable for the present invention, and FIG. 2(b) is for explaining an elliptically polarizing plate 11 shown in FIG. 2(a). A diagram of the relationship between the axes. FIG. 3 is a cross-sectional view schematically showing a liquid crystal display device 3 1 in which the elliptically polarizing plate 1 of the example shown in FIG. 1(a) is disposed on both surfaces of the liquid crystal cell 3 2 . Fig. 4 is a cross-sectional view schematically showing a liquid crystal display device 4 1 in which the elliptically polarizing plate η of the example shown in Fig. 2(a) is disposed on both surfaces of the liquid crystal cell 3 2 . Fig. 5 is a view schematically showing a step of cutting a linear polarizing plate in the method of manufacturing an elliptically polarizing plate of the present invention. Fig. 6 is a view schematically showing a 1/4 wave plate feeding step and a bonding step in the method of manufacturing an elliptically polarizing plate of the present invention. Fig. 7 is a view showing a concrete example of the case where the elliptically polarizing plate 1 having the structure in which the linear polarizing plate 3 and the 1/4 wave plate 2 are laminated as shown in Fig. 1 is produced. Fig. 8 is a view schematically showing a 1 / 2 wave plate feeding step and a 1 / 2 wave plate bonding step in the method of manufacturing an elliptically polarizing plate of the present invention. Fig. 9 is a view schematically showing a 1/4 wave plate feeding step and a 1/4 wave plate bonding step in the method of manufacturing an elliptically polarizing plate of the present invention. [Fig. 10] A specific example of a case where the elliptically polarizing plate 11 having the structure in which the linear polarizing plate 3 and the 1/2 wave plate 12 and the 1/4 wave plate 2 are sequentially laminated as shown in Fig. 2 is formed. . -45- 201001027 [Description of main component symbols] 1,11: Elliptical polarizer 2 : 1 / 4 wave plate 3 : Linear polarizing plate 6 : Delay axis of 1/4 wave plate 7 : Absorption axis of linear polarizing plate 1 2 : 1 / 2 wave plate 1 3 : 1 / 2 wave plate slow phase axis 3 1,41 : liquid crystal display device 3 2 : liquid crystal cell 3 3 : pressure sensitive adhesive 3 4 : backlight 5 0 : cutting machine 5 2: Roller of linear polarizing plate 5 3 : Feeding direction of long-side linear polarizing plate 5 4 : Angle of formation of long-side direction of linear polarizing plate and cutting direction (set angle) 5 5 : Cut-out body of linear polarizing plate 6 0 : bonding device 62 : 1/4 wave plate roller 6 3 : long edge 1/4 wave plate feeding direction 64, 74 : linear polarizing plate cutting body sending direction 70 : first bonding device - 46- 201001027 72 : 1/2 wave plate roller 73: long edge 1/2 wave plate feeding direction 7 5 : linear polarizing plate and 1 /2 wave plate bonding body 76: bonded body cutting body 8 0 : 2nd bonding apparatus 84: the feeding direction of the bonding body 8 6 : The cutting edge of the bonding body 8 7 : The angle of formation of the cutting edge of the bonding body and the side edge along the longitudinal direction of the 1 / 4 wave plate ( Set angle) -47-

Claims (1)

201001027 VII. Patent application scope 1 · A retardation film characterized by a polypropylene resin, the in-plane phase difference 値R〇 is in the range of 70~200 nm, and the in-plane retardation axis direction of the film is set. When the refractive index is nx, the refractive index in the in-plane axis direction is ny, and the refractive index in the thickness direction is nz, the Nz coefficient defined by the following formula (1) is in the range of 1.1 to 2, The standard deviation of the retardation axis angle measured at intervals of 1 mm or less is 0.6° or less Nz = (nx-nz) / (nx-ny) (1). 2. The retardation film of claim 1, wherein the polypropylene resin contains 10% by weight. /. The following ethylene units are formed from a copolymer of propylene and ethylene. 3. For the phase difference film of claim 1 of the patent scope, it operates as a 1/4 wave plate. 4. An elliptically polarizing plate characterized by laminating a phase difference film which is a 1/4 wave plate operation of the third aspect of the patent application to a linear polarizing plate. A liquid crystal display device is characterized in that it is formed by laminating an elliptically polarizing plate of the fourth aspect of the patent application to at least one side of a liquid crystal cell (Uiquid crystal cell). A method for producing an elliptically polarizing plate, which is a method for producing an elliptically polarizing plate according to item 4 of the patent application, characterized in that it has a linear polarizing plate which has an absorption axis parallel or perpendicular to a longitudinal direction of the film, and a film. The direction in which the long-side direction is set to the angle of the 'cutting step sequentially' to obtain the parallelogram-cutting body' and -48-201001027 The phase difference 値Rq of the polypropylene resin is in the range of 200 nm. It is assumed that the refractive index in the direction of the in-plane direction of the retardation axis in the plane of the film is ny, and in the case of refraction in the thickness direction, the following formula (1) NZ = (nx-nz) / (nx-ny) (1) The defined N z coefficient is in the range of 1.1 to 2, and the standard deviation of the retardation axis angle measured by 丨 mm is 〇·6. Hereinafter, a step of feeding a quarter-wave plate in which the longitudinal direction of the film is parallel or perpendicular, a step from the roll feeding device, and the above-mentioned cut-off body and the aforementioned quarter-wave plate are used to make the cut body flat. The step of bonding is carried out in a manner that the flattening device is flat with both side edges along the longitudinal direction of the 1/4 wave plate. 7·—The column-shaped polarizing plate' is characterized by a phase difference film and a linear polarizing plate which are operated as a 1/4 wave plate in the patent application, and are configured as a phase difference film which operates as a 1/2 wave plate. 8 - A liquid crystal display device is characterized in that the elliptically polarizing plate of the patent application is laminated on at least one side of the liquid crystal cell. 9. A method for manufacturing an elliptically polarizing plate, which is the seventh item of the manufacturing scope The method of the elliptically polarizing plate is characterized in that the absorption axis is parallel or perpendicular to the longitudinal direction of the film, and the direction of the longitudinal direction of the film is set to an angle, and the parallelogram cut body is sequentially cut. And a thermoplastic resin made of a retardation axis to the long side of the film or a vertical 1/2 wave plate 'from the roll to the first bonding device 70 to η χ, the ratio η: The late phase axis exits to the affixing cut line to enclose the third, and the seventh 〇 专利 专利 patented polarized light, the step of obtaining the flattening, -49- 201001027 and the aforementioned cut body and the aforementioned 1|/2 wave plate 'The two sides of the cut body which are cut 1 by the flat line are parallel to the both side edges along the longitudinal direction of the W2 wave plate, the bonding step is performed by the first bonding means, and the cut body is cut out a bonding body with the 1/2 wave plate, and a set angle to the longitudinal direction of the film The direction of 'cutting sequentially' to obtain a parallelogram cut-out body, and the phase difference 値RQ formed by the polypropylene resin is in the range of 70 to 200 nm, and the in-plane retardation axis of the film is set. When the refractive index of the direction is nx, and the refractive index of the in-plane axis direction is ny', the refractive index of the thickness direction is ιι2, the following formula (1) Nz = (nx-nz) / (nx-ny) (1) The defined Nz coefficient is in the range of 1.1 to 2, and the standard deviation of the retardation axis angle measured at intervals of 1 mm or less is 0.6 or less, and the retardation axis is parallel or perpendicular to the longitudinal direction of the film. /4 wave plate, the step of feeding from the roller to the second bonding device, and the cutting body of the bonding body and the 1/4 wave plate, so that the cut body of the bonding body is cut in parallel by the two sides and the edge The two sides of the longitudinal direction of the quarter-wave plate are set at an angle, and the second bonding device is attached to the step-50-