TW201432328A - Long polarizing plate and method for producing the same - Google Patents

Abstract

The propose of the present invention provides a polarizing plate which the blurriness of the axis angle is small, the polarizing plate performance (especially, the axis shift angel and the optical leakage) were improved, and also offer an excellent liquid crystal display device which comprises the optical leakage or tone change would not be carried out even the change of the environment such as the temperature and humidity occurs. The solution of the present invention is a polarizing plate and a liquid crystal display device using the said polarizing plate. The said polarizing plate is made by laminating a long polarizer with parallel absorption axis in the long direction, and a long transparent film which has vertical or parallel slow axis in the long direction and the in-plane retardation value Re, the retardation value Rth in the thick direction of the thickness satisfy the formulae (i) and (ii). At this time, the axis shift angel of the perpendicular and the parallel of the absorption axis and the slow axis is less than 10 degree preferably. (i) 0 ≤ Re(630) ≤ 20 (ii) |Rth(630)| ≤ 25.

Description

Long strip polarizing plate and manufacturing method thereof

The present invention relates to a polarizing plate produced by laminating a long strip-shaped polarizer and a long strip-shaped transparent film having a small optical anisotropy, a method for producing the same, and a liquid crystal display device using the polarizing plate.

A liquid crystal display device (LCD) is composed of a liquid crystal cell and a polarizing plate. The polarizing plate has a protective film and a polarizer. For example, a polarizer composed of a polyvinyl alcohol film can be dyed and stretched by using iodine, and a protective film can be laminated on both surfaces thereof. In the transmissive liquid crystal display device, the polarizing plate is attached to both sides of the liquid crystal cell, and one or more optical compensation films are further disposed. The reflective liquid crystal display device is formed by arranging a reflector, a liquid crystal cell, one or more optical compensation films, and a polarizing plate in this order. The liquid crystal cell system is composed of a liquid crystal molecule, two substrates for enclosing the liquid crystal molecules, and an electrode layer for applying a voltage to the liquid crystal molecules. The liquid crystal cell system can be applied to any of the types of ON and OFF, and both the penetrating and reflective types by the alignment state of the liquid crystal molecules. Proposals have revealed, for example, TN (Twisted Nematic), IPS (In-Plane Switching), OCB (Optically Compensatory Bend), VA (Vertically Aligned) Display mode such as ECB (Electrically Controlled Birefringenece).

Among such LCDs, there is a need for high display quality. A 90-degree twisted nematic liquid crystal display (hereinafter, referred to as a TN mode) driven by a thin film transistor is mainly used as a nematic liquid crystal molecule having a positive dielectric constant. However, although the TN mode has excellent display characteristics when viewed from the front, when viewed in the oblique direction, there is a gray scale inversion due to a decrease in contrast and a sharpness of the gray scale display, resulting in deterioration of so-called display characteristics. The viewing angle characteristics are strongly required to improve this situation.

In order to solve such problems, there are proposals to reveal a vertical match. In the (VA) mode, a horizontal electric field is applied to the liquid crystal, and the liquid crystal display device by the in-plane switching (IPS) mode or the liquid crystal having a negative dielectric constant with a vertical alignment is formed in the panel. The protrusion or the slit electrode is used for the alignment division, and is being put into practical use. In recent years, these panels have not only been used for monitors, but have also been developed for use as TVs, with a dramatic improvement in the brightness of the screen. Therefore, these operation modes have not been a problem in the past, and light leakage in the oblique incident direction at the diagonal position at the time of black display has gradually become a cause of deterioration in display quality.

One of the methods for improving the viewing angle of the hue or black display, In the IPS mode, an optical compensation material having birefringence characteristics is also disposed between the liquid crystal layer and the polarizing plate. For example, it is disclosed that the birefringent medium is disposed between the substrate and the polarizing plate, and the optical axes of the birefringent medium are orthogonal to each other, and the effect of increasing or decreasing the hysteresis value of the liquid crystal layer when the tilt is compensated can improve the white display from the oblique direction. Or the color of the mid-tone display (see Patent Document 1). Further, there has been proposed a method of using an optical compensation film composed of a styrene polymer having a negative intrinsic birefringence or a discotic liquid crystal compound (see Patent Documents 2, 3, and 4). However, since most of the proposed methods are to eliminate the birefringence anisotropy of the liquid crystal in the liquid crystal cell to improve the viewing angle, there is a cross angle of the polarizing axis when the crossed Nicols are viewed from an oblique direction. The problem of light leakage caused by orthogonal offset is not fully solved. Moreover, even if it is considered that the light leakage can be compensated, it is very difficult to compensate the liquid crystal cell without any problem. The reason is that even at a certain wavelength, the light leakage can be completely compensated, and it is not always compensated at other wavelengths. For example, even if the wavelength of green light having the highest visibility can compensate for light leakage, there is a problem that light leakage occurs at a blue wavelength of a smaller wavelength or a red light of a larger wavelength. In order to solve this problem, Non-Patent Document 1 proposes to laminate two sheets of biaxial film. However, in this method, since two biaxial films are used, the axial shift of the biaxial film is liable to occur, and there is a problem that screen unevenness is likely to occur. Further, conventionally, a triacetyl cellulose film as a polarizing plate protective film is used between the liquid crystal cell and the polarizer, and the in-plane retardation value Re is about 5 nm, and the hysteresis value Rth in the film thickness direction is about 50 nm. Both become the cause of light leakage during black display. Therefore, it is desired to develop a transparent film having an in-plane hysteresis value Re and a hysteresis value Rth in the film thickness direction as a protective film for a polarizing plate. Further, it is also desired to laminate the transparent film to a polarizing plate in which the polarizer is attached in a state where the axial shift is small.

Moreover, in recent years, in terms of liquid crystal display devices, internal back The light plate has a temperature rise and is used in a high temperature and high humidity environment. The triacetyl cellulose film of the polarizing plate protective film is caused by temperature and humidity. The Re and Rth are changed, and there is a problem that the optical compensation capability is changed, the light is leaked during black display, or the image is uneven. In particular, in this case, when the longitudinal and lateral lengths of the display device are different and the members originally have different physical properties in the vertical and horizontal directions, when the display is originally black, it is a problem that a light leakage phenomenon or a change in color tone occurs from the periphery of the frame of the display device. . Therefore, it is desired to develop a thin film, and it is possible to obtain a liquid crystal display device having a small change in optical compensation function caused by such an environment.

[Patent Document 1] JP-A-9-80424

[Patent Document 2] Japanese Patent Publication No. Hei 10-54982

[Patent Document 3] Japanese Patent Publication No. 11-202323

[Patent Document 4] JP-A-9-292522

[Non-Patent Document 1] Jpn. J. Appl. Phys. 41. (2002) 4553

A first aspect of the present invention provides a polarizing plate in which an in-plane hysteresis value Re of a protective film of a long polarizing plate and a hysteresis value Rth in a film thickness direction are reduced to about zero, and the polarizing plate is subjected to The polarizing plate performance during processing is good. Here, the term "long" means that the length in the longitudinal direction is not particularly limited, and it is preferably 100 meters or more in the process, and more preferably 1000 meters or more and 10,000 meters in the process. The following is better.

A second object of the present invention is to provide an excellent wet crystal display device which does not cause light leakage or color tone change even if the temperature or humidity changes.

(1) A long-length polarizing plate which is a long-length polarizer having parallel absorption axes in the longitudinal direction, and a hysteresis value Re having a vertical or parallel slow axis in the longitudinal direction and in the film plane The hysteresis value Rth of the film in the film thickness direction is formed by laminating the long strip-shaped transparent film of the formula (i) (ii).

(i)0≦Re ₍₆₃₀₎ ≦20

(ii)|Rth ₍₆₃₀₎ |≦25

[In the formula, Re(λ) is the hysteresis value (unit: nanometer) and Rth(λ) in the plane of the wavelength λ nm in the film thickness direction of the wavelength λ nm (unit: nanometer)]

(2) The strip-shaped polarizing plate of (1), wherein an axis of the polarizer absorption axis orthogonal to or parallel to the slow axis of the transparent film is within 10 degrees.

(3) The long-length polarizing plate of (1) or (2), which contains deuterated cellulose as a polymer raw material for forming the transparent film.

(4) The long-length polarizing plate according to any one of (1) to (3), wherein the plate penetration rate TT, parallel penetration rate PT, positive at 400 to 700 nm of 60% RH at 25 ° C The cross transmittance CT and the degree of polarization P are at least one of the following formulas (a) to (d).

(a) 40.0≦TT≦45.0

(b) 30.0≦PT≦40.0

(c) CT≦2.0

(d) 95.0≦P

(5) The elongated polarizing plate according to any one of (1) to (4), wherein when the orthogonal transmittance at the wavelength λ is T (λ), T ₍₃₈₀₎ , T ₍₄₁₀₎ , T ₍₇₀₀₎ is at least one of the following (e) to (g).

(e)T ₍₃₈₀₎ ≦2.0

(f)T ₍₄₁₀₎ ≦1.0

(g)T ₍₇₀₀₎ ≦0.5

(6) The long-length polarizing plate according to any one of (1) to (5), wherein in the case of standing at 500 ° C for 95 hours under conditions of 60 ° C and 95% RH, orthogonality at 400 to 700 nm The amount of change ΔCT of the transmittance and the amount of change ΔP of the degree of polarization are at least one of the following formulas (h) and (i).

(h)-6.0≦△CT≦6.0

(i)-10.0≦△P≦0.0

(The change amount is the value obtained by subtracting the measured value before the test from the measured value after the test)

(7) The long-length polarizing plate according to any one of (1) to (6), wherein, in the case of standing at 500 ° C for 90 hours under conditions of 60 ° C for 90 hours, orthogonality of 400 to 700 nm The amount of change ΔCT of the transmittance and the amount of change ΔP of the degree of polarization are at least one of the following formulas (j) and (k).

(j)-3.0≦△CT≦3.0

(k)-5.0≦△P≦0.0

(8) The elongated polarizing plate according to any one of (1) to (7), wherein, in the case of standing at 80 ° C for 500 hours, the orthogonal transmittance at 400 to 700 nm The amount of change ΔCT and the amount of change in the degree of polarization ΔP are at least one of the following formulas (1) and (m).

(l)-3.0≦△CT≦3.0

(m)-2.0≦△P≦0.0

(9) A long-length polarizing plate provided on the transparent film of the elongated polarizing plate according to any one of (1) to (8), wherein an optical anisotropic layer conforming to the following formula (iii) is provided It is an integral type of optical compensation film.

(iii) Re ₍₆₃₀₎ =0~200 (nano), and |Rth ₍₆₃₀₎ |=0~400 (nano)

(10) The elongated polarizing plate of (9), wherein the optically anisotropic layer is formed using a discotic liquid crystalline compound.

(11) The elongated polarizing plate of (10), wherein the optically anisotropic layer is formed using a rod-like liquid crystalline compound.

(12) The elongated polarizing plate according to any one of (9) to (11) wherein the optically anisotropic layer is composed of a polymer film having birefringence.

(13) The elongated polarizing plate of (12), wherein the polymer film forming the optically anisotropic layer contains at least one selected from the group consisting of polyamine, polyimine, polyester, and polyether ketone. A polymeric material consisting of a group of polyamidoximine polyester quinone imines and polyaryl ether ketones.

(14) The elongated polarizing plate according to any one of (1) to (13), wherein at least one of a hard coat layer, an antiglare layer, and an antireflection layer is provided on the surface.

(15) A polarizing plate obtained by cutting the long polarizing plate of any one of (1) to (14).

(16) A liquid crystal display using the polarizing plate of (15).

(17) A liquid crystal display which is of the VA or IPS type in the liquid crystal display of (16).

(18) A method for producing a long-length polarizing plate, which is characterized in that a strip-shaped polarizer, a hysteresis value Re in a film surface, and a hysteresis value in a film thickness direction are bonded by a roll to roll Rth conforms to the long strip transparent film of formula (i) (ii).

(i)0≦Re ₍₆₃₀₎ ≦20

(ii)|Rth ₍₆₃₀₎ |≦25

[In the formula, Re(λ) is the hysteresis value (unit: nanometer) and Rth(λ) in the plane of the wavelength λ nm in the film thickness direction of the wavelength λ nm (unit: nanometer)]

According to a first aspect of the present invention, there is provided a polarizing plate which reduces the in-plane hysteresis value Re of the protective film of the polarizing plate and the hysteresis value Rth in the film thickness direction to about zero, and the roll is used to fit the long roll. The polarizing plate has a small deviation of the axial angle of the polarizing plate, and can improve the performance of the polarizing plate (especially the shaft angle and the light leakage). A second effect of the present invention provides an optical compensation film and a polarizing plate using the above transparent film, and provides an excellent liquid crystal display device which does not cause light leakage or color tone change even if the temperature or humidity environment changes.

[Best Mode for Carrying Out the Invention]

The polarizing plate is composed of a polarizer and a transparent film that protects both sides thereof.

Hereinafter, the transparent film used in the polarizing plate of the present invention (hereinafter, "the transparent film of the present invention") will be described in detail.

[Method of Manufacturing Transparent Film]

The method for producing the transparent film of the present invention will be described below.

[Method of Producing Film Using Solvent Casting Method]

In the transparent film of the present invention, it is preferred to continuously form a long film by a solvent casting method. The solvent casting method is to dissolve a polymer of a film raw material into a suitable organic solvent to form a solution (glue), and the paste is cast on a suitable support, preferably a metal support, and then The solvent is dried, and the film is peeled off from the support to further dry the solvent of the film.

[Amount of residual solvent at the time of stripping]

When a film is produced by a solvent casting method, the film is placed on a metal support to dry the solvent, and the film is peeled off when the film is gelated. In order to strip the film, the amount of residual solvent in the film is preferably from 60 to 150%. The amount of residual solvent is represented by the following formula. Further, the residual volatile weight was a value obtained by heating the film at 120 ° C for 2 hours, and then subtracting the weight of the film after the heat treatment from the weight of the film before the heat treatment.

Residual solvent amount = residual volatile weight / film weight after heat treatment × 100 (%)

[The tension required for film handling]

After the drying step from the metal support, the film is usually shrunk in the width direction (direction perpendicular to the machine direction) by evaporation of the solvent. The transparent film of the present invention must be controlled to extend without any force, either in the machine direction or in the direction perpendicular thereto. Specifically, the tensile strength required from the film transporting roller to the mechanical direction of the film during transport in the machine direction is preferably 10 to 50 kgf/m. On the other hand, the tensile strength required in the direction perpendicular to the machine direction is preferably the same. At this time, the film is held in the vertical direction, and in order to adjust the tension, the tenter method using the tension clamp can also be suitably used. For example, Japanese patents In the drying step or a part of the steps, a method of using a clip to maintain the width of both ends of the width of the film in the width direction and drying it (the tenter direction) can be suitably used.

[Physical properties of transparent film]

Hereinafter, the physical properties of the transparent film of the present invention will be described.

[Film Modulus of Film]

The transparent film of the present invention, the tensile modulus of elasticity in the machine direction of 240 ~ 500kgf / mm ^2, a tensile modulus of elasticity of the direction perpendicular to the machine direction of 230 ~ 480kgf / mm ^2, and a machine direction tensile modulus The ratio of the number/tensile modulus to the direction perpendicular to the machine direction is preferably 0.80 to 1.36.

Preferably, the tensile elastic modulus in the machine direction is 250 to 480 kgf/mm ² , the tensile elastic modulus in the direction perpendicular to the machine direction is 240 to 470 kgf/mm ² , and the tensile elastic modulus in the mechanical direction/ The ratio of the tensile elastic modulus in the direction perpendicular to the machine direction is preferably from 0.85 to 1.30. More preferably, the tensile elastic modulus in the machine direction is 260 to 460 kgf/mm ² , the tensile elastic modulus in the direction perpendicular to the machine direction is 250 to 450 kgf/mm ² , and the tensile elastic modulus in the mechanical direction/ The ratio of the tensile elastic modulus in the direction perpendicular to the machine direction is preferably 0.88 to 1.25. The specific measurement method is to use the TOYO BOLDWIN universal tensile testing machine STM T50BP to measure the stress at 0.5% elongation at a tensile speed of 10%/min in an environment of ‧70% at 23 ° C. number.

[Storage Elastic Modulus of Film]

The storage elastic modulus of the transparent film of the present invention in the mechanical direction and the storage elastic modulus in the direction perpendicular to the mechanical direction are both 15,000 to 80,000 kgf/mm ² , and the storage tensile elastic modulus / mechanical direction in the mechanical direction The ratio of the storage tensile modulus in the vertical direction is preferably 0.80 to 1.20.

Preferably, the storage tensile elastic modulus in the machine direction and the vertical direction is 18000 to 75000 kgf/cm ² , and the ratio of the storage tensile elastic modulus in the mechanical direction to the storage elastic modulus in the direction perpendicular to the mechanical direction is 0.82. ~1.18. More preferably, the storage elastic modulus in the machine direction and the vertical direction is 20,000 to 70,000 kgf/cm ² , and the ratio of the storage tensile elastic modulus in the mechanical direction to the storage tensile elastic modulus in the direction perpendicular to the mechanical direction is 0.84. ~1.16.

Specifically, the measurement method is to determine the dynamic viscoelasticity by changing the temperature, and to obtain the storage elastic modulus.

[Photoelastic modulus of film]

The photo-elastic modulus of the transparent film of the present invention in the machine direction and the photoelastic modulus in the direction perpendicular to the machine direction are both 50 × 10 ^-13 cm ² /dyne or less, and the photoelastic modulus of the mechanical direction / The ratio of the photoelastic modulus in the direction perpendicular to the mechanical direction is preferably 0.80 to 1.20.

Preferably, the photoelastic modulus in the mechanical direction and the photoelastic modulus in the direction perpendicular to the mechanical direction are both 40 × 10 ^-13 cm ² /dyne or less, and the photoelastic modulus in the mechanical direction / perpendicular to the mechanical direction The ratio of the photoelastic modulus of the direction is 0.82 to 1.18.

More preferably, the photoelastic modulus in the machine direction and the photoelastic modulus in the direction perpendicular to the machine direction are both 30 × 10 ^-13 cm ² /dyne or less, and the photoelastic modulus in the mechanical direction / perpendicular to the machine direction The ratio of the photoelastic modulus of the direction is 0.84 to 1.16.

The specific measurement method is the sample of the transparent film of the present invention. Tensile stress was applied in the long axis direction of m × 120 mm, and the hysteresis value at this time was measured using a polarization ellipsometer (M150, Japan Spectrophotometer), and the photoelastic modulus was calculated from the amount of change in the hysteresis value of the stress. .

[Dimensional change of film]

The dimensional change rate of the transparent film of the present invention after 24 hours at 60 ° C and 90% RH and the dimensional change rate after drying at 90 ° C for 24 hours are ±0.5% or less in the machine direction and in the direction perpendicular to the machine direction. In any case, the ratio of the dimensional change rate in the mechanical direction / the dimensional change rate perpendicular to the mechanical direction is preferably 0.3 to 2.5.

Preferably, the dimensional change rate after 24 hours at 60 ° C and 90% RH and the dimensional change rate after drying at 90 ° C for 24 hours are ±0.4% or less in the machine direction and in the direction perpendicular to the machine direction. In either case (the dimensional change rate in the machine direction) / (the dimensional change rate perpendicular to the machine direction) is 0.4 to 2.2.

Specifically, the measurement method is to prepare two sheets of the transparent film of the present invention, 30 mm × 120 mm, and humidity-controlled at 25 ° C, 60% RH for 24 hours, by means of a pin gauge (Xindong Science) )), a hole of 6 mm Φ is separated by 100 mm at both ends as the original size (L0) of the perforation interval. After one piece of the sample was treated at 60 ° C, 90% RH for 24 hours, the size (L1) of the perforation interval was measured, and after another piece of the sample was treated at 90 ° C, 5% RH for 24 hours, the size of the perforation interval was measured (L2). ). All intervals were measured to a minimum of 1/1000 mm. 60°C, 90% RH dimensional change rate={(L0-L1)/L0}×100, 90°C, 5%RH dimensional change rate={(L0-L2)/L0}×100, and the dimensional change is obtained. rate.

[The coefficient of hygroscopic expansion of the film]

The hygroscopic expansion coefficient of the transparent film of the present invention is preferably 30 × 10 ^-5 /% RH or less. The coefficient of hygroscopic expansion is preferably 15 × 10 ^-5 /% RH or less, more preferably 10 × 10 ^-5 /% RH or less. Further, although the coefficient of hygroscopic expansion is preferably small, the value is usually 1.0 × 10 ^-5 /% RH or more. Further, it is preferable that the coefficient of hygroscopic expansion in the machine direction and the vertical direction is about the same. The coefficient of hygroscopic expansion indicates the amount of change in the length of the sample when the relative humidity is changed below a certain temperature. By adjusting the hygroscopic expansion coefficient and using the transparent film as the optical compensation film support, while maintaining the optical compensation function of the optical compensation film, it is possible to prevent light leakage due to an increase in the frame-shaped transmittance, that is, deformation.

Since the protection against polarizers can be improved, the present invention The thickness of the transparent film is preferably thicker, but when the film thickness is too thick, the optical properties of the polarizing plate are lowered, and curling, handling, and the like may occur, preferably 20 to 200 μm, and 40 to 180 μm. More preferably, it is characterized by 40 to 100 microns.

[Transparency of film]

The moisture permeability of the transparent film of the present invention is measured under conditions of a temperature of 60 ° C and a humidity of 95% RH based on JIS standard JIS Z0208, and is converted into a film thickness of 80 μm to 400 to 2000 g/m ² . 24h is better. Take 500~1800g/m ² . 24h is better, with 600~1600g/m ² . 24h is especially good. More than 2000g/m ² . At 24 hours, the absolute value of the humidity dependence of the Re value and the Rth value of the film is stronger than that of 0.5 nm/% RH. Further, when the optically exclusive layer of the cellulose-deposited film of the present invention is laminated as an optical compensation film, the absolute value of the humidity dependence of the Re value and the Rth value is also higher than the tendency of 0.5 nm/% RH. Not good. When an optical compensation film or a polarizing plate is assembled in a liquid crystal display device, a change in color tone or a decrease in viewing angle occurs. Further, the vaporized film of the deuterated cellulose film has a moisture permeability of less than 400 g/m ² . At 24 hours, when the polarizing plate is attached to both sides of the polarizer, the cellulose-deposited film prevents the adhesive from drying and causes adhesion failure.

The measurement of the moisture permeability can be applied to the "physical properties of polymers II" (Multimedia Experiment Lecture 4, Keli publication), pp. 285-294: Determination of vapor penetration (mass method, thermometer method, vapor pressure method, adsorption amount) According to the method described in the method, the sample of the deuterated cellulose film of the present invention is adjusted to 70 mm Φ at 25 ° C, 90% RH, and 60 ° C, 95% RH for 24 hours, and a moisture permeability test device (KK-709007) is used. , Toyo Seiki Co., Ltd., calculated the moisture content per unit area (g/m ² ) according to JIS Z-0208, and the moisture permeability = the weight after humidity adjustment - the weight before humidity adjustment, and the moisture permeability was obtained.

[Evaluation of Optical Properties of Transparent Films]

In the present specification, Re(λ) and Rth(λ) each indicate an in-plane hysteresis value at the wavelength λ and a hysteresis value in the thickness direction. Re(λ) is measured by KOBRA 21ADH (manufactured by Oji Scientific Instruments Co., Ltd.), and incident light of a wavelength of λ nm in the normal direction of the film. Rth(λ) is the oblique axis (rotation axis) by the aforementioned Re(λ), the in-plane slow phase axis (determined using KOBRA 21ADH), and the wavelength λ is incident in a direction inclined to the film normal direction by +40 degrees. The hysteresis value measured by the light of the nanometer and the light of the wavelength λ nm incident in the direction in which the in-plane slow phase axis is the tilt axis (rotation axis) and inclined in the normal direction of the film by -40 degrees. The hysteresis value is calculated based on the hysteresis value measured in the three directions in total, and is calculated by KOBRA 21ADH. Here, the assumed value of the average refractive index can be a value of a product guide (JOHN WILEY & SONS, INC), a catalogue of various optical films. Average refraction If the value of the coefficient is not known, it can be measured using an Abbe refractometer. The values of the average refractive index of the main optical film are exemplified as follows: deuterated cellulose (1.48), cycloolefin polymer (1.52), polycarbonate (1.59), polymethyl methacrylate (1.49), polystyrene ( 1.59). Nx, ny, and nz were calculated from KOBRA 21ADH by inputting the assumed values of the average refractive index and the film thickness. Nz=(nx-nz)/(nx-ny) can be further calculated by nx, ny, and nz calculated by this.

(in-plane hysteresis value Re)

The transparent film of the present invention preferably has an in-plane hysteresis value of 0 ≦ Re ₍₆₃₀₎ ≦ 20, preferably 0 ≦ Re ₍₆₃₀₎ ≦ 15 and more preferably 0 ≦ Re ₍₆₃₀₎ ≦ 10.

(hysteresis value Rth in the film thickness direction)

The transparent film of the present invention has an in-plane hysteresis value of preferably |Rth ₍₆₃₀₎ | ≦25, preferably |Rth ₍₆₃₀₎ | ≦23, and more preferably |Rth ₍₆₃₀₎ | ≦20.

(temperature change of polarizing plate, light leakage on the board of temperature change, color tone change)

The transparent film of the present invention can be suitably used as a transparent protective film which is a polarizer of a liquid crystal display device. When it is assembled on a liquid crystal display device, it is assumed that the temperature rises due to the backlight inside the device, and when it is used in a high-temperature and high-humidity environment, especially when the black display is supposed to be black, the whole screen should be black. When the transparent protective film of the polarizing plate to be used is compared, it is possible to reduce unevenness or hue change failure caused by light leakage from the periphery of the frame of the display device, and it is more preferable to make the above-described failure zero.

[Material of transparent film]

The material for forming the transparent film of the present invention is preferably a polymer excellent in optical performance transparency, mechanical strength, thermal stability, moisture shielding property, isotropism, etc., and the above Re and Rth may satisfy the above (i) (ii). Any material can be used. For example, a polyester polymer such as a polycarbonate polymer, polyethylene terephthalate or polyethylene naphthalate, or an acrylic polymer such as polymethyl methacrylate may be mentioned. A styrene polymer such as polystyrene or acrylonitrile or a styrene copolymer (AS resin). Further, examples thereof include a polyolefin such as polyethylene or polypropylene, a polyolefin polymer of an ethylene-propylene copolymer, a vinyl chloride polymer, a polyamide or an aromatic polyamide. , quinone imine polymer, fluorene polymer, polyether fluorene polymer, polyether ether ketone polymer, polyphenylene sulfide polymer, vinylidene chloride polymer, vinyl alcohol polymer, ethylene An alcoholic butyral polymer, an arylate polymer, a polyoxymethylene polymer, an epoxy polymer, or a polymer obtained by mixing the above polymers. Further, the transparent film of the present invention may be formed of a cured layer of an ultraviolet curable or thermosetting resin such as an acrylic, urethane, urethane, epoxy or polyoxyn. form.

Further, as a material for forming the transparent film of the present invention, a thermoplastic drop can be used. Alkene resin. Thermoplastic drop Examples of the olefinic resin include ZEONEX manufactured by Japan ZEON Co., Ltd., ZEONOA, ARTON manufactured by JSR Co., Ltd., and the like.

Further, the material for forming the transparent film of the present invention has been conventionally used. Triacetyl cellulose which is a transparent protective film of a polarizing plate can be represented, and a cellulose-based polymer (hereinafter referred to as deuterated cellulose) can be suitably used. . Deuterated cellulose is described in detail below.

[醯化cellulose raw cotton]

As the cellulose of the deuterated cellulose raw material used for the transparent film of the present invention, there are cotton linters or wood pulp (broad wood pulp, coniferous wood pulp), etc., and deuteration obtained from any available raw material cellulose can also be used. Cellulose can also be mixed according to the situation. For details of such raw material cellulose, for example, "Plastic Materials Lecture (17) Cellulose Resin" (Maruzawa, Uda, Nikkan Kogyo Shimbun, 1970) or Invention Association Public Technical Report No. 2001-1745 The cellulose described in the No. (pages 7 to 8) is not particularly limited to the cellulose film.

[Deuterated cellulose substitution degree]

Next, deuterated cellulose prepared by using the above cellulose as a raw material will be described. Since deuterated cellulose is obtained by deuterating a hydroxy group of cellulose, a substituent fluorenyl group having 2 carbon atoms to 2 carbon atoms can be used. The degree of substitution of the hydroxyl group of the cellulose of the deuterated cellulose is not particularly limited, and the degree of substitution of the acetic acid substituted with the hydroxyl group of the cellulose and/or the fatty acid having 3 to 22 carbon atoms can be measured. The measurement method can be carried out in accordance with ASTM D-817-91.

As described above, the hydroxyl group of cellulose of deuterated cellulose is taken The degree of substitution is not particularly limited, and the degree of substitution of the hydroxy group of the hydroxyl group of the cellulose is preferably 2.50 to 3.00, the degree of substitution is preferably 2.75 to 3.00, and the degree of substitution is preferably 2.85 to 3.00.

Substituting the hydroxyl group of cellulose for acetic acid and/or carbon number 3~ Among the fatty acids of 22, the fluorenyl group having 2 to 22 carbon atoms may be an aliphatic group or an aryl group, and is not particularly limited, and may be either single or two. Mixture on it. These may be, for example, an alkyl carbamate of an cellulose, an alkenyl carboester or an aromatic carboester, an aromatic alkyl carbamate, or the like, and may each have a substituent. Preferred sulfhydryl groups of these may be ethenyl, propyl, butyl, decyl, decyl, octyl, decyl, decyl, thirteenth, tetradecyl , hexadecanyl, octadecyl, isobutyl sulfhydryl, tributyl decyl, cyclohexane carbhydryl, anthracenyl, benzamyl, naphthylcarbenyl, cinnamyl, and the like. Among them, acetyl, propyl, butyl, decyl, octadecyl, tert-butyl, sulfhydryl, benzhydryl, naphthylcarbenyl, and cinnamyl are preferred, Mercapto, propyl sulfonyl, and butyl sulfhydryl are preferred.

The inventor of the present invention has learned from the results of the intensive review The thiol substituent of the hydroxyl group of the above cellulose is substantially at least two kinds selected from the group consisting of an ethyl fluorenyl group, a propyl fluorenyl group and a butyl fluorenyl group, and the total degree of substitution is 2.50 to 3.00, which can reduce the optical properties of the fluorinated cellulose film. Different direction. The thiol substitution degree is preferably 2.60 to 3.00, more preferably 2.65 to 3.00.

[degree of polymerization of deuterated cellulose]

The degree of polymerization of the deuterated cellulose suitable for use in the present invention has an average degree of polymerization of 180 to 700, preferably 180 to 550 for deuterated cellulose, more preferably 180 to 400, and particularly preferably 180 to 350. . When the degree of polymerization is too high, the viscosity of the cemented solution of deuterated cellulose becomes high, and it becomes difficult to produce a film by casting. When the degree of polymerization is too low, the strength of the film produced is low. The average degree of polymerization can be measured according to the limit viscosity method of Uda et al. (Uda Kazuo, Saito Hideo, Fiber Society, Vol. 18, No. 1, 105-120, 1962). It is described in detail in Japanese Laid-Open Patent Publication No. Hei 9-95538.

In particular, the thiol substituent is used essentially only of the thiol group. When the average degree of polymerization is from 180 to 550 deuterated cellulose to produce the transparent film of the present invention, the optical anisotropy can be further reduced.

Further, the molecular weight of the deuterated cellulose suitable for use in the present invention The distribution, which is evaluated by gel permeation chromatography, has a polydispersity index Mw/Mn (Mw is a mass average molecular weight, Mn is a number average molecular weight), and a molecular weight distribution is preferably narrow. The specific Mw/Mn value is preferably 1.0 to 3.0, more preferably 1.0 to 2.0, and most preferably 1.0 to 1.6.

When the low molecular component is removed, although the average molecular weight (polymerization) Degree) becomes high, but it is useful because the viscosity becomes lower than that of normal deuterated cellulose. The deuterated cellulose having a low molecular component can be obtained by removing the low molecular component of the deuterated cellulose synthesized by a usual method. Removal of the low molecular component can be carried out by washing the cellulose with a suitable organic solvent. Further, in the case of producing deuterated cellulose having a low molecular weight component, it is preferred to adjust the amount of the sulfuric acid catalyst in the acetamidine reaction to 0.5 to 25 parts by mass per 100 parts by mass of the cellulose. When the amount of the sulfuric acid catalyst is in the above range, the molecular weight distribution is also preferable, and the deuterated cellulose having a uniform molecular weight distribution can be synthesized. When the sulfuric acid catalyst is used for the production of deuterated cellulose, the water content thereof is preferably 2% by mass or less, more preferably 1% by mass or less, and particularly preferably 0.7% by mass or less. It is known that the normal deuterated cellulose has a water content of 2.5 to 5% by mass. In order to satisfy the moisture content of the deuterated cellulose, it is necessary to dry it, and if the purpose can be attained, the method is not particularly limited. The raw material cotton or the synthesis method of such deuterated cellulose is described in detail on pages 7 to 12 of the Invention Association Open Technical Bulletin No. 2001-1745 (issued March 15, 2001, Invention Association).

Deuterated cellulose, if substituent, degree of substitution, degree of polymerization, fraction When the sub-quantity distribution or the like is in the above range, it may be used alone or in combination of two or more kinds of deuterated cellulose.

[Additive for transparent film]

The transparent film of the present invention may be obtained by thermally melting a thermoplastic polymer resin to form a film, or by forming a film from a solution (solvent casting method) and using a solution obtained by uniformly dissolving a polymer. At the time of hot melt film formation, various additives (for example, a compound which reduces optical anisotropy, a wavelength dispersion adjuster, an ultraviolet ray preventive agent, a plasticizer, an anti-deterioration agent, fine particles, an optical property adjuster, etc.) can be added at the time of heat-melting. On the other hand, when the transparent film is adjusted from a solution, a polymer solution (hereinafter referred to as a dope) may be added with various additives depending on the application in each preparation step (for example, a compound which lowers optical anisotropy, a wavelength dispersion adjuster, and ultraviolet rays) Preventing agents, plasticizers, anti-deterioration agents, fine particles, optical property modifiers, etc., which will be described below. Further, the addition period may be added at any step of the dope manufacturing step, or the addition step of the additive addition may be added in the dope preparation step.

[Structural characteristics of a compound which reduces the optical anisotropy of a transparent film]

First, the compound for reducing the optical anisotropy of the transparent film of the present invention will be described. As a result of intensive review, the inventors of the present invention have found that the use of a compound which inhibits the alignment of the polymer in the film in the in-plane direction and the film thickness direction can sufficiently reduce the optical anisotropy and make Re and Rth close to zero. Therefore, it is advantageous that the compound which reduces the optical anisotropy is sufficiently compatible with the polymer, and the compound itself does not have a rod-like structure or a planar structure. Specifically, when a planar utero-energy group having a complex number such as an aromatic group is used It is advantageous that the functional groups are not in the same plane, making them non-planar.

[Amount of addition of a compound which reduces the optical anisotropy of a transparent film]

The optical anisotropy of the deuterated cellulose of the present invention is particularly preferably a compound containing at least one hysteresis value Rth which lowers the film thickness direction of the film in a range conforming to the following formulas (iv) and (v).

(iv) (Rth(A)-Rth(0))/A≦-1.0

(v) 0.01≦A≦30

The above formula (ii), (iii) is (iv) (Rth(A)-Rth(0))/A≦-2.0

(v) 0.05≦A≦25

Preferably (iv) (Rth(A)-Rth(0))/A≦-3.0

(v) 0.1≦A≦20

For better.

Hereinafter, specific examples of the compound which is suitable for reducing the optical anisotropy of the transparent film, that is, Re and Rth, which are suitable for use in the present invention are shown in the following formulas (1) to (4), but the present invention is not limited to such a compound. Hereinafter, this will be described in detail.

First, the compounds of the formulae (1) and (2) will be explained.

In the above formula (1), R ^1a represents an alkyl group or an aryl group, and R ^2a and R ^3a each independently represent a hydrogen atom, an alkyl group or an aryl group. Further, the sum of the number of carbon atoms of R ^1a , R ^2a and R ^3a is particularly preferably 10 or more. Further, in the formula (2), R ^4a and R ^5a each independently represent an alkyl group or an aryl group. Further, the total number of carbon atoms of R ^4a and R ^5a is 10 or more, an alkyl group and aryl group each may have a substituent. The substituent is preferably a fluorine atom, an alkyl group, an aryl group, an alkoxy group, a sulfonic acid group or a sulfonamide group. It is characterized by an alkyl group, an aryl group, an alkoxy group, a sulfonic acid group, and a sulfonamide group. Further, the alkyl group may be linear, branched or cyclic, preferably having 1 to 25 carbon atoms, more preferably 6 to 25, and 6 to 20 (for example, methyl or ethyl). Base, propyl, isopropyl, butyl, isobutyl, tert-butyl, pentyl, isopentyl, tert-pentyl, hexyl, cyclohexyl, heptyl, octyl, bicyclooctyl, decyl , adamantyl, fluorenyl, tertiary octyl, undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecane The base, nonadecyl group, and dinonyl group are particularly preferred. The aryl group is preferably 6 to 30 carbon atoms and 6 to 24 carbon atoms (for example, phenyl group, biphenyl group, triphenylene group, naphthyl group, binaphthyl group, or triphenylphenyl group). Preferred examples of the compound represented by the formula (1) are as follows, but the present invention is not limited by the specific examples.

Next, the compounds of the general formulae (3) and (4) will be described.

^Wherein R ^1d represents an alkyl group or an aryl group, and R ^2d and R ^3d represent an independently hydrogen atom, an alkyl group or an aryl group. Further, the alkyl group or the aryl group may have a substituent.

The compound of the formula (3) is preferably a compound represented by the following formula (4).

In the above formula (4), R ^4d , R ^5d and R ^6d each independently represent an alkyl group or an aryl group. Here, the alkyl group may be linear or branched or cyclic, and the number of carbon atoms is preferably from 1 to 20, more preferably from 1 to 15, and most preferably from 1 to 12. The cyclic alkyl group is particularly preferably a cyclohexyl group. The aryl group preferably has 6 to 36 carbon atoms and more preferably 6 to 24 carbon atoms.

The above alkyl group and aryl group may have a substituent, a substituent a halogen atom (for example, chlorine, bromine, fluorine, and iodine), an alkyl group, an aryl group, an alkoxy group, an aryloxy group, a decyl group, an alkoxycarbonyl group, an aryloxycarbonyl group, a decyloxy group, a sulfonylamino group, A hydroxyl group, a cyano group, an amine group and a decylamino group are preferred, and a halogen atom, an alkyl group, an aryl group, an alkoxy group, an aryloxy group, a sulfonylamino group and a decylamino group are more preferred, and an alkyl group or an aryl group is preferred. Sulfhydrylamino and guanamine groups are particularly preferred.

Hereinafter, preferred examples of the compound represented by the formula (3) or (4) The sub-system is as follows, but the present invention is not limited to these specific examples.

[Wavelength dispersion adjuster]

The transparent film of the present invention is characterized in that Re and Rth are small, and it is preferable that the dependence of wavelengths of Re and Rth on the wavelength, that is, the wavelength dispersion is small. In the method of reducing the wavelength dispersion, the present invention is effective in adding a compound having a wavelength-dispersed dispersion (hereinafter also referred to as a wavelength dispersion adjusting agent) to a transparent film, and such compounds will be described below. In order to improve the wavelength dispersion of Rth of the transparent film of the present invention, it is preferred to contain at least one wavelength dispersion ΔRth=| of Rth reduced by the following formula (vi) in the range satisfying the following formulas (vii) and (viii); Rth ₍₄₀₀₎ -Rth ₍₇₀₀₎ | Compound.

(vi) ΔRth=|Rth ₍₄₀₀₎ -Rth ₍₇₀₀₎ |

(vii)(△Rth(B)-△Rth(0))/B≦-2.0

(viii) 0.01≦B≦30

Here, Rth ₍₄₀₀₎ : Rth (nm) at 400 nm

Rth ₍₇₀₀₎ : Rth (nm) at 700 nm

ΔRth(B): ΔRth (nm) of a film containing a compound having a B% decrease of ΔRth

Rth(0): ΔRth(nm) of a film which does not contain a compound which lowers ΔRth

B: weight (%) of the compound relative to the weight of the film raw material of 100

The above formulas (vii) and (viii) are (vii)(ΔRth(B)-ΔRth(0))/B≦-3.0

(viii) 0.05≦B≦25

Preferably, (vii)(ΔRth(B)-ΔRth(0))/B≦-4.0

(viii) 0.1≦B≦20

For better.

The above-described wavelength dispersion adjusting agent having an absorption in the ultraviolet region of 200 to 400 nm, with a solid content with respect to the transparent film, and containing 0.01 to 30 wt% of at least one reducing film _{| Re (400) -Re (700} ) |and|Rth ₍₄₀₀₎ -Rth ₍₇₀₀₎ | A compound that adjusts the wavelength dispersion of Re and Rth of a transparent film.

The value of Re and Rth of the transparent film, usually the dispersion characteristic is a long wave The long side is larger than the short wavelength side. Therefore, it is required to smooth the wavelength dispersion by increasing Re and Rth on the relatively small short-wavelength side. On the other hand, the wavelength dispersion characteristic of the compound having absorption in the ultraviolet region of 200 to 400 nm is that the absorbance on the long wavelength side is larger than the absorbance on the short wavelength side. When the compound itself is equiaxed in the transparent film, it is presumed that the birefringence of the compound itself, and further, the wavelength dispersion of Re and Rth is larger on the short wavelength side than the wavelength dispersion of the absorbance.

Therefore, as described above, by using at 200 to 400 nm The ultraviolet region has absorption, and the wavelength dispersion of Re and Rth of the compound itself is large on the short-wavelength side, and the wavelengths of Re and Rth of the transparent film can be modulated. Therefore, it is required to adjust the wavelength-dispersed compound to be sufficiently and uniformly compatible with the solid component of the polymer.

Further, in recent years, liquid crystal display devices such as televisions, notebook personal computers, and portable portable terminals have required an optical member used in a liquid crystal display device to have excellent transmittance in order to increase brightness with less power. At this point, when the transparent film is added to the compound in the ultraviolet region of 200 to 400 nm, which can absorb the film |Re ₍₄₀₀₎ -Re ₍₇₀₀₎ | and |Rth ₍₄₀₀₎ -Rth ₍₇₀₀₎ | Excellent spectral transmittance can be obtained. The transparent film of the present invention preferably has a light transmittance of 45% or more and 95% or less at a wavelength of 380 nm and a light transmittance of 10% or more at a wavelength of 350 nm.

As described above, the present invention is suitable for use from the viewpoint of volatility The molecular weight of the wavelength dispersion adjusting agent is preferably 250 to 1000, preferably 260 to 800, more preferably 270 to 800, and most preferably 300 to 800. In the range of these molecular weights, a specific monomer structure may also be used, and the monomer unit may be an oligomer structure or a polymer structure in which a plurality of monomers are combined.

Wavelength dispersion modifier for slurry flow in the manufacture of transparent membranes The process of stretching and drying does not volatilize.

(compound addition amount)

The amount of the wavelength dispersion adjusting agent to be used in the above-described invention is preferably from 0.01 to 30% by weight, more preferably from 0.1 to 20% by weight, still more preferably from 0.2 to 10% by weight, based on the transparent film.

(Method of compound addition)

Further, these wavelength dispersion adjusting agents may be used singly or in combination of two or more kinds of compounds in any ratio.

Further, the period of adding the wavelength dispersing agent may be added at any step of the dope manufacturing step or at the end of the dope modulating step.

Specific examples of wavelength dispersion adjusting agents suitable for use in the present invention Examples thereof include a benzotriazole-based compound, a diphenyl ketone-based compound, a cyano-containing compound, a hydroxydiphenyl ketone-based compound, a salicylate-based compound, and a nickel-salted salt-based compound. The invention is not limited to such compounds.

a benzotriazole-based compound, in the present invention, a formula (101) The object shown can be suitably used as a wavelength dispersion adjusting agent.

General formula (101) Q ¹ -Q ² -OH

(wherein Q ¹ represents a nitrogen-containing aromatic heterocyclic ring, and Q ² represents an aromatic ring)

Q ¹ represents a nitrogen-containing aromatic heterocyclic ring, preferably a nitrogen-containing aromatic heterocyclic ring of 5 to 7 members, preferably a 5- to 6-membered nitrogen-containing aromatic heterocyclic ring, and examples thereof include imidazole and pyrazole. , triazole, tetrazole, thiazole, Oxazole, carbazole, benzotriazole, benzothiazole, benzo Oxazole, benzoxazole, thiadiazole, Diazole, naphthylthiazole, naphthacene Azole, azabenzimidazole, anthracene, pyridine, pyridyl Pyrimidine ,three , triazepine, tetraazaindene, etc., more preferably a nitrogen-containing aromatic heterocyclic ring of 5 members, specifically imidazole, pyrazole, triazole, tetrazole, thiazole, Oxazole, benzotriazole, benzothiazole, benzo Oxazole, thiadiazole, The oxadiazole is preferred, and the benzotriazole is particularly preferred.

The nitrogen-containing aromatic heterocyclic ring represented by Q ¹ may have a more substituent, and the substituent T to be described later may be applied. Further, when the substituents are plural, they may each undergo ring-retraction to form a ring.

The aromatic ring represented by Q ² may be an aromatic hydrocarbon ring or an aromatic hetero ring. Moreover, these may be single rings or may form a fused ring with other rings.

The aromatic hydroxy ring is preferably a monocyclic or bicyclic aromatic hydroxy ring having 6 to 30 carbon atoms (for example, a benzene ring, a naphthalene ring, etc., preferably an aromatic hydroxy group having 6 to 20 carbon atoms). More preferably, it is an aromatic hydroxy group having a carbon number of 6 to 12, and more preferably a benzene ring.

The aromatic heterocyclic ring is preferably an aromatic heterocyclic ring containing a nitrogen atom or a sulfur atom. Specific examples of the heterocyclic ring include thiophene, imidazole, pyrazole, pyridine, and pyridyl ,despair Triazole, three , hydrazine, carbazole, hydrazine, thiazoline, thiazole, thiadiazole, Diazole, Oxazole, quinoline, isoquinoline, anthracene Naphthyridine, quinine Porphyrin, quinazoline, Porphyrin, acridine, acridine, morphine, brown , tetrazole, benzimidazole, benzene well Oxazole, benzothiazole, benzotriazole, tetraazaindene, and the like. Aromatic heterocyclic ring with pyridine, three Quinoline is preferred.

The aromatic ring represented by Q ² is preferably an aromatic hydroxy ring, more preferably a naphthalene ring or a benzene ring, and particularly preferably a benzene ring. Q ² may have a more substituent, and a substituent T to be described later is preferred.

Examples of the substituent T include an alkyl group (preferably having 1 to 20 carbon atoms, more preferably 1 to 12 carbon atoms, and particularly preferably 1 to 8 carbon atoms, and examples thereof include a methyl group and an ethyl group. Isopropyl, tert-butyl, n-octyl, n-decyl, n-hexadecyl, cyclopropyl, cyclopentyl, cyclohexyl, etc.), alkenyl (preferably having a carbon number of 2 to 20, carbon) The number 2 to 12 is more preferable, and the carbon number is 2 to 8 is particularly preferable, and examples thereof include a vinyl group, an allyl group, a 2-butenyl group, a 3-pentenyl group, etc., and an alkynyl group (carbon). The number is preferably from 2 to 20, more preferably from 2 to 12 carbon atoms, and particularly preferably from 2 to 8 carbon atoms, such as propargyl, 3-pentynyl, etc., and aryl (carbon) The number is preferably from 6 to 30, more preferably from 6 to 20 carbon atoms, and particularly preferably from 6 to 12 carbon atoms, such as phenyl, p-methylphenyl, naphthyl, etc., substituted or not. a substituted amine group (preferably having a carbon number of 0 to 20, more preferably a carbon number of 0 to 10, and particularly preferably having a carbon number of 0 to 6, and examples thereof include an amine group, a methylamino group, and a dimethylamine. Base, diethylamine, dibenzylamine, etc., alkoxy (preferably having a carbon number of 1 to 20, more preferably 1 to 12 carbon atoms, and particularly preferably having a carbon number of 1 to 8) Such as methoxy, ethoxy a base, a butoxy group, or the like, an aryloxy group (preferably having a carbon number of 6 to 20, more preferably a carbon number of 6 to 16 or more preferably a carbon number of 6 to 12, and examples thereof include a phenoxy group. , 2-naphthyloxy group, etc., fluorenyl group (preferably having a carbon number of 1 to 20, more preferably 1 to 16 carbon atoms, and particularly preferably having a carbon number of 1 to 12, and examples thereof include an ethyl fluorenyl group. , benzamidine, methionyl, trimethylethenyl, etc.), alkoxycarbonyl (preferably having a carbon number of 2 to 20, preferably having a carbon number of 2 to 16 and having a carbon number of 2 to 12) Particularly preferred are, for example, a methoxycarbonyl group or an ethoxycarbonyl group, and an aryloxycarbonyl group (preferably having a carbon number of 7 to 20, more preferably a carbon number of 7 to 16 and a carbon number of 7 to 6). 10 is particularly preferable, for example, a phenoxycarbonyl group or the like, and a decyloxy group (preferably having a carbon number of 2 to 20, preferably a carbon number of 2 to 16 and a carbon number of 2 to 10). Examples include, for example, an anthraceneoxy group, a benzamidineoxy group, and the like, and a mercaptoamine group (preferably having a carbon number of 2 to 20, preferably a carbon number of 2 to 16 and a carbon number of 2 to 10). Preferably, for example, an acetamino group, a benzylamino group, or an alkoxycarbonylamino group (preferably having a carbon number of 2 to 20, more preferably having a carbon number of 2 to 16 and having a carbon number) 2~12 is especially good, you can cite For example, methoxycarbonylamino group, etc., aryloxycarbonylamino group (preferably having a carbon number of 7 to 20, more preferably 7 to 16 carbon atoms, and particularly preferably having a carbon number of 7 to 12). Examples thereof include a phenoxycarbonylamino group and the like, and a sulfonylamino group (preferably having a carbon number of 1 to 20, more preferably 1 to 16 carbon atoms, and particularly preferably a carbon number of 1 to 12). For example, methanesulfonamide, benzenesulfonylamine, etc., and aminesulfonyl (preferably having a carbon number of 0 to 20, preferably having a carbon number of 0 to 16, preferably having a carbon number of 0 to 12). For example, there may be mentioned, for example, an amine sulfonyl group, a methylamine sulfonyl group, a dimethylamine sulfonyl group, a phenylamine sulfonyl group, or the like, and an aminomethyl fluorenyl group (a carbon number of 1 to 20 is preferred). It is more preferably a carbon number of 1 to 16, and particularly preferably a carbon number of 1 to 12, and examples thereof include an aminomethyl fluorenyl group, a methylaminomethyl fluorenyl group, and a diethylaminomethyl fluorenyl group. Phenylaminocarbinyl group, etc., alkylthio group (preferably having a carbon number of 1 to 20, more preferably 1 to 16 carbon atoms, and particularly preferably having a carbon number of 1 to 12, and for example, Sulfur-based, ethylthio-based, etc., arylthio group (preferably having a carbon number of 6 to 20, more preferably having a carbon number of 6 to 16 and a carbon number of 6 to 12, and examples thereof include benzene sulfur Base, etc.) Sulfhydryl group (preferably having a carbon number of 1 to 20, preferably a carbon number of 1 to 16 and a carbon number of 1 to 12, and examples thereof include a methylsulfonyl group and a p-toluenesulfonyl group) Sulfhydryl group (preferably having a carbon number of 1 to 20, preferably having a carbon number of 1 to 16 and a carbon number of 1 to 12, and examples thereof include methane sulfinyl group and benzene sulfinic acid; Mercapto group, etc., urea group (preferably having a carbon number of 1 to 20, more preferably 1 to 16 carbon atoms, and particularly preferably having a carbon number of 1 to 12, and examples thereof include a urea group and a methyl urea group. , phenylurea group, etc.), amine phosphate group (preferably having a carbon number of 1 to 20, more preferably 1 to 16 carbon atoms, and particularly preferably having a carbon number of 1 to 12, and examples thereof include diethyl Amino phosphate, phenylphosphoric acid, etc.), hydroxyl group, hydrogenthio group, halogen atom (for example, fluorine atom, chlorine atom, bromine atom, iodine atom), cyano group, sulfonic acid group, carboxyl group, nitro group, hydroxamic acid a group, a sulfinyl group, a fluorenyl group, an imido group, a heterocyclic group (preferably having a carbon number of 1 to 30, more preferably a carbon number of 1 to 12, and a hetero atom such as a nitrogen atom, an oxygen atom or a sulfur atom, specifically There may be mentioned, for example, imidazolyl, pyrazolyl, quinolyl, furyl, piperidinyl, Porphyrin, benzo Oxazolyl, benzimidazolyl, benzothiazolyl, etc., decane (preferably having a carbon number of 3 to 40, more preferably 3 to 30 carbon atoms, and particularly preferably having a carbon number of 3 to 24). There are, for example, trimethyldecylalkyl, triphenylsulfonylalkyl and the like. These substituents may also be further substituted. Further, when there are two or more substituents, they may be the same or different. Also, if possible, they may be joined to each other to form a loop.

The compound of the formula (101) is preferably a compound represented by the following formula (101-A).

General formula (101-A)

(wherein R ¹ , R ² , R ³ , R ⁴ , R ⁵ , R ⁶ , R ⁷ and R ⁸ each independently represent a hydrogen atom or a substituent.)

R ¹ , R ² , R ³ , R ⁴ , R ⁵ , R ⁶ , R ⁷ and R ⁸ each independently represent a hydrogen atom or a substituent, and the substituent T may be used as the substituent. Further, these substituents may be further substituted by other substituents, and the substituents may also be condensed to form a ring structure.

R ¹ and R ³ are preferably a hydrogen atom, an alkyl group, an alkenyl group, an alkynyl group, an aryl group, a substituted or unsubstituted amino group, an alkoxy group, an aryloxy group, a hydroxyl group or a halogen atom, and a hydrogen atom, An alkyl group, an aryl group, an alkoxy group, an aryloxy group or a halogen atom is preferred, and a hydrogen atom and an alkyl group having 1 to 12 carbon atoms are more preferred, and an alkyl group having 1 to 12 carbon atoms is preferred (preferably carbon). The number 4~12) is especially good.

R ² and R ⁴ are preferably a hydrogen atom, an alkyl group, an alkenyl group, an alkynyl group, an aryl group, a substituted or unsubstituted amino group, an alkoxy group, an aryloxy group, a hydroxyl group or a halogen atom, and a hydrogen atom, An alkyl group, an aryl group, an alkoxy group, an aryloxy group or a halogen atom is preferred, and a hydrogen atom and an alkyl group having 1 to 12 carbon atoms are more preferred, and a hydrogen atom and a methyl group are particularly preferred, and a hydrogen atom is used. optimal.

R ⁵ and R ⁸ are preferably a hydrogen atom, an alkyl group, an alkenyl group, an alkynyl group, an aryl group, a substituted or unsubstituted amino group, an alkoxy group, an aryloxy group, a hydroxyl group or a halogen atom, and a hydrogen atom, An alkyl group, an aryl group, an alkoxy group, an aryloxy group or a halogen atom is preferred, and a hydrogen atom and an alkyl group having 1 to 12 carbon atoms are more preferred, and a hydrogen atom and a methyl group are particularly preferred, and a hydrogen atom is used. optimal.

R ⁶ and R ⁷ are preferably a hydrogen atom, an alkyl group, an alkenyl group, an alkynyl group, an aryl group, a substituted or unsubstituted amino group, an alkoxy group, an aryloxy group, a hydroxyl group or a halogen atom, and a hydrogen atom, An alkyl group, an aryl group, an alkoxy group, an aryloxy group or a halogen atom is preferred, and a hydrogen atom or a halogen atom is more preferred, and a hydrogen atom or a chlorine atom is particularly preferred.

The formula (101) is represented by the following formula (101-B) Things are better.

General formula (101-B)

(wherein R ¹ , R ³ , R ⁶ and R ⁷ are the same as each of the formula (101-A), and the preferred range is also the same)

The benzotriazole compound as an example is given above. In the case where the transparent film of the present invention is produced without containing a molecular weight of 320 or less, it is confirmed to be advantageous in terms of retention.

Further, the diphenylketone compound is a wave used in the present invention. One of the long dispersion adjustments, the diphenyl ketone compound is preferably a compound represented by the formula (102).

General formula (102)

(wherein Q ¹ and Q ² represent independent aromatic rings. X represents NR (R represents a hydrogen atom or a substituent), an oxygen atom or a sulfur atom)

The aromatic ring represented by Q ¹ and Q ² may be an aromatic hydroxy ring or an aromatic hetero ring. Again, these may be single rings or may form a fused ring with other rings.

The aromatic hydroxy ring represented by Q ¹ and Q ² is preferably a monocyclic or bicyclic aromatic hydroxy ring having 6 to 30 carbon atoms (for example, a benzene ring or a naphthalene ring) Preferably, the aromatic hydroxy ring having 6 to 20 carbon atoms is preferred, and the aromatic hydroxy ring having 6 to 12 carbon atoms is more preferred, and more preferably a benzene ring.

The aromatic heterocyclic ring represented by Q ¹ and Q ² is preferably an aromatic heterocyclic ring containing at least one of an oxygen atom, a nitrogen atom or a sulfur atom. Specific examples of the heterocyclic ring include, for example, furan, pyrrole, thiophene, imidazole, pyrazole, pyridine, and pyridyl. ,despair Triazole, three , hydrazine, carbazole, hydrazine, thiazoline, thiazole, thiadiazole, Oxazoline, Azole, Diazole, quinoline, isoquinoline, anthracene Naphthyridine, quinine Porphyrin, quinazoline, Porphyrin, acridine, acridine, morphine, brown , tetrazole, benzimidazole, benzo Oxazole, benzothiazole, benzotriazole, tetraazaindene, and the like. Aromatic heterocyclic ring with pyridine, three Quinoline is preferred.

The aromatic ring represented by Q ¹ and Q ² is preferably an aromatic hydroxy ring, preferably an aromatic hydroxy ring having 6 to 10 carbon atoms, more preferably a substituted or unsubstituted benzene ring.

Q ¹ and Q ² may have a more substituent, and a substituent T to be described later is preferred, and the substituent does not contain a carboxylic acid, a sulfonic acid or a quaternary ammonium salt. Further, when possible, the substituents may be linked to each other to form a ring structure.

X-based NR (R represents a hydrogen atom or a substituent. A substituent The substituent T), an oxygen atom or a sulfur atom described later may be used, and X is preferably NR (R is preferably a fluorenyl group, a sulfonyl group, or may be a substituent or further substituted), or O, It is especially good for O.

Examples of the substituent T include an alkyl group (preferably having 1 to 20 carbon atoms, more preferably 1 to 12 carbon atoms, and particularly preferably 1 to 8 carbon atoms, and examples thereof include a methyl group and an ethyl group. Isopropyl, tert-butyl, n-octyl, n-decyl, n-hexadecyl, cyclopropyl, cyclopentyl, cyclohexyl, etc.), alkenyl (preferably having a carbon number of 2 to 20, carbon) The number 2 to 12 is more preferable, and the carbon number is 2 to 8 is particularly preferable, and examples thereof include a vinyl group, an allyl group, a 2-butenyl group, a 3-pentenyl group, etc., and an alkynyl group (carbon). The number is preferably from 2 to 20, more preferably from 2 to 12 carbon atoms, and particularly preferably from 2 to 8 carbon atoms, such as propargyl, 3-pentynyl, etc., and aryl (carbon) The number is preferably from 6 to 30, more preferably from 6 to 20 carbon atoms, and particularly preferably from 6 to 12 carbon atoms, such as phenyl, p-methylphenyl, naphthyl, etc., substituted or not. a substituted amine group (preferably having a carbon number of 0 to 20, more preferably a carbon number of 0 to 10, and particularly preferably having a carbon number of 0 to 6, and examples thereof include an amine group, a methylamino group, and a dimethylamine. Base, diethylamine, dibenzylamine, etc., alkoxy (preferably having a carbon number of 1 to 20, more preferably 1 to 12 carbon atoms, and particularly preferably having a carbon number of 1 to 8) Such as methoxy, ethoxy a base, a butoxy group, or the like, an aryloxy group (preferably having a carbon number of 6 to 20, more preferably a carbon number of 6 to 16, and a carbon number of 6 to 12, particularly preferably a phenoxy group. , 2-naphthyloxy group, etc., fluorenyl group (preferably having a carbon number of 1 to 20, more preferably 1 to 16 carbon atoms, and particularly preferably having a carbon number of 1 to 12, and examples thereof include an ethyl fluorenyl group. , benzylidene, methionyl, trimethylethenyl, etc., aryloxycarbonyl (preferably having a carbon number of 7 to 20, preferably having a carbon number of 7 to 16 and having a carbon number of 7 to 10) Particularly preferred are, for example, phenoxycarbonyl groups, and decyloxy groups (preferably having a carbon number of 2 to 20, more preferably 2 to 16 carbon atoms, and particularly preferably having a carbon number of 2 to 10). Examples thereof include a decyloxy group, a benzamidineoxy group, and the like, and a guanamine group (preferably having 2 to 20 carbon atoms, more preferably 2 to 16 carbon atoms, and particularly preferably 2 to 10 carbon atoms). For example, there may be mentioned, for example, an acetamino group or a benzylamino group, and an alkoxycarbonylamino group (preferably having a carbon number of 2 to 20, more preferably 2 to 16 carbon atoms, and a carbon number of 2 to 2). 12 is particularly preferable, for example, a methoxycarbonylamino group, etc., an aryloxycarbonylamino group (preferably having a carbon number of 7 to 20, and a carbon number of 7 to 16 is more preferably a carbon number of 7). ~12 is especially good, can be cited For example, a phenoxycarbonylamino group or the like, or a sulfonamide group (preferably having a carbon number of 1 to 20, more preferably 1 to 16 carbon atoms, and particularly preferably having a carbon number of 1 to 12, and examples thereof include, for example, Methanesulfonamide, benzenesulfonylamine, etc., and aminesulfonyl (preferably having a carbon number of 0 to 20, more preferably a carbon number of 0 to 16, and a carbon number of 0 to 12 is particularly preferable. Either, for example, an amine sulfonyl group, a methylamine sulfonyl group, a dimethylamine sulfonyl group, a phenylamine sulfonyl group, or the like, an aminomethyl fluorenyl group (preferably having a carbon number of 1 to 20, and carbon) The number 1 to 16 is more preferable, and the carbon number is preferably 1 to 12, and examples thereof include an aminomethyl fluorenyl group, a methylaminomethyl fluorenyl group, a diethylaminomethyl fluorenyl group, and a phenylamine group. a mercapto group or the like, an alkylthio group (preferably having a carbon number of 1 to 20, more preferably a carbon number of 1 to 16, and particularly preferably having a carbon number of 1 to 12, and examples thereof include a methylthio group, Ethylthio group, etc., arylthio group (preferably having a carbon number of 6 to 20, more preferably a carbon number of 6 to 16 and a carbon number of 6 to 12, and examples thereof include a phenylthio group, etc.) Sulfhydryl group (preferably having a carbon number of 1 to 20, preferably a carbon number of 1 to 16 and a carbon number of 1 to 12, and examples thereof include a methylsulfonyl group and a p-toluenesulfonyl group. Etc.), sulfin The base is preferably a carbon number of 1 to 20, preferably a carbon number of 1 to 16, and a carbon number of 1 to 12, and examples thereof include a methanesulfinyl group and a sulfinyl group. Urea group (preferably having a carbon number of 1 to 20, more preferably 1 to 16 carbon atoms, and particularly preferably having a carbon number of 1 to 12, and examples thereof include a urea group, a methyl urea group, and a phenyl urea group. Base or the like, and an amine phosphate group (preferably having a carbon number of 1 to 20, more preferably 1 to 16 carbon atoms, and particularly preferably having a carbon number of 1 to 12, and examples thereof include diethylphosphoric acid amine group, Phenylphosphoric acid group, etc.), hydroxy group, thiol group, halogen atom (for example, fluorine atom, chlorine atom, bromine atom, iodine atom), cyano group, sulfonic acid group, carboxyl group, nitro group, hydroxamic acid group, sulfinic acid a group, a mercapto group, an imido group, a heterocyclic group (preferably having a carbon number of 1 to 30, more preferably a carbon number of 1 to 12, and a hetero atom such as a nitrogen atom, an oxygen atom or a sulfur atom, specifically, For example, imidazolyl, pyrazolyl, quinolyl, furyl, piperidinyl, Porphyrin, benzo Oxazolyl, benzimidazolyl, benzothiazolyl, etc., decane (preferably having a carbon number of 3 to 40, more preferably 3 to 30 carbon atoms, and particularly preferably having a carbon number of 3 to 24). There are, for example, trimethyldecylalkyl, triphenylsulfonylalkyl and the like. These substituents may also be further substituted. Further, when there are two or more substituents, they may be the same or different. Also, if possible, they may be joined to each other to form a loop.

The compound of the formula (102) is preferably a compound represented by the following formula (102-A).

General formula (102-A)

(wherein R ¹ , R ² , R ³ , R ⁴ , R ⁵ , R ⁶ , R ⁷ , R ⁸ and R ⁹ each independently represent a hydrogen atom or a substituent)

R ¹ , R ² , R ³ , R ⁴ , R ⁵ , R ⁶ , R ⁷ , R ⁸ and R ⁹ each independently represent a hydrogen atom or a substituent, and the substituent T may be used as the substituent. Further, these substituents may be further substituted by other substituents, and the substituents may also be condensed to form a ring structure.

R ¹ , R ³ , R ⁴ , R ⁵ , R ⁶ , R ⁸ and R ⁹ are a hydrogen atom, an alkyl group, an alkenyl group, an alkynyl group, an aryl group, a substituted or unsubstituted amino group, an alkoxy group. An aryloxy group, a hydroxyl group or a halogen atom is preferred, and a hydrogen atom, an alkyl group, an aryl group, an alkoxy group, an aryloxy group or a halogen atom is preferred, and a hydrogen atom or an alkyl group having 1 to 12 carbon atoms is more preferred. Preferably, the hydrogen atom and the methyl group are particularly preferred, and the hydrogen atom is preferred.

R ^{2 is} preferably a hydrogen atom, an alkyl group, an alkenyl group, an alkynyl group, an aryl group, a substituted or unsubstituted amino group, an alkoxy group, an aryloxy group, a hydroxyl group, a halogen atom, preferably a hydrogen atom, a carbon number of 1. An alkyl group of ~20, an amine group of 0 to 20 carbon atoms, an alkoxy group having 1 to 12 carbon atoms, an aryloxy group having 6 to 12 carbon atoms, a hydroxyl group, more preferably an alkoxy group having 1 to 20 carbon atoms. Particularly preferred is an alkoxy group having 1 to 12 carbon atoms.

R ^{7 is} preferably a hydrogen atom, an alkyl group, an alkenyl group, an alkynyl group, an aryl group, a substituted or unsubstituted amino group, an alkoxy group, an aryloxy group, a hydroxyl group, a halogen atom, preferably a hydrogen atom, a carbon number of 1. ~20 alkyl group, carbon number 0-20 amino group, carbon number 1-12 alkoxy group, carbon number 6-12 aryloxy group, hydroxyl group, more preferably hydrogen atom, carbon number 1-20 alkyl group The base (preferably having a carbon number of 1 to 12, preferably having a carbon number of 1 to 8 and preferably a methyl group) is preferably a methyl group or a hydrogen atom.

The formula (102) is represented by the following formula (102-B) Things are better.

General formula (102-B)

(wherein R ¹⁰ represents a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted alkynyl group, a substituted or unsubstituted aryl group)

R ¹⁰ represents a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted alkynyl group, a substituted or unsubstituted aryl group, and the substituent T may be used as the substituent.

The substituent of R ¹⁰ is preferably a substituted or unsubstituted alkyl group, preferably a substituted or unsubstituted alkyl group having 5 to 20 carbon atoms, and a substituted or unsubstituted alkyl group having 5 to 12 carbon atoms. More preferably (exemplified by n-hexyl, 2-ethylhexyl, n-octyl, n-decyl, n-dodecyl, benzyl, etc.), substituted or unsubstituted alkyl group having 6 to 12 carbon atoms (2-ethylhexyl, n-octyl, n-decyl, n-dodecyl, benzyl) is particularly preferred.

The compound represented by the formula (102) can be used by a Japanese It is synthesized by a well-known method described in Japanese Patent Publication No. Hei 11-12219.

The compound represented by the formula (102) is exemplified below, but the present invention is not limited by these.

Further, the cyano group-containing compound is a wavelength dispersion used in the present invention. One of the regulators is preferably a cyano compound represented by the formula (103).

General formula (103)

(wherein Q ¹ and Q ² represent independent aromatic rings. X ¹ and X ² represent a hydrogen atom or a substituent, and at least one of them represents a cyano group, a carbonyl group, a sulfonyl group, or an aromatic group. The aromatic ring represented by the ring) Q ¹ and Q ² may be an aromatic hydroxy ring or an aromatic hetero ring. Moreover, these may also be single rings or may form a fused ring with other rings.

The aromatic hydroxy ring is preferably (preferably a single ring having a carbon number of 6 to 30) Or a bicyclic aromatic hydroxy ring (for example, a benzene ring, a naphthalene ring, etc.), preferably an aromatic hydroxy group having 6 to 20 carbon atoms, more preferably an aromatic hydroxy group having 6 to 12 carbon atoms) More preferably, it is a benzene ring.

The aromatic heterocyclic ring is preferably an aromatic heterocyclic ring containing a nitrogen atom or a sulfur atom. Specific examples of the heterocyclic ring include thiophene, imidazole, pyrazole, pyridine, and pyridyl ,despair Triazole, three , hydrazine, carbazole, hydrazine, thiazoline, thiazole, thiadiazole, Diazole, Oxazole, quinoline, isoquinoline, anthracene Naphthyridine, quinine Porphyrin, quinazoline, Porphyrin, acridine, acridine, morphine, brown , tetrazole, benzimidazole, benzene well Oxazole, benzothiazole, benzotriazole, tetraazaindene, and the like. Aromatic heterocyclic ring with pyridine, three Quinoline is preferred.

The aromatic ring represented by Q ¹ and Q ² is preferably an aromatic hydroxy ring, and more preferably a benzene ring.

Further, Q ¹ and Q ² may have a substituent, and a substituent T to be described later is preferred. Examples of the substituent T include an alkyl group (preferably having 1 to 20 carbon atoms, more preferably 1 to 12 carbon atoms, and particularly preferably 1 to 8 carbon atoms, and examples thereof include a methyl group and an ethyl group. Isopropyl, tert-butyl, n-octyl, n-decyl, n-hexadecyl, cyclopropyl, cyclopentyl, cyclohexyl, etc.), alkenyl (preferably having a carbon number of 2 to 20, carbon) The number 2 to 12 is more preferable, and the carbon number is 2 to 8 is particularly preferable, and examples thereof include a vinyl group, an allyl group, a 2-butenyl group, a 3-pentenyl group, etc., and an alkynyl group (carbon). The number is preferably from 2 to 20, more preferably from 2 to 12 carbon atoms, and particularly preferably from 2 to 8 carbon atoms, such as propargyl, 3-pentynyl, etc., and aryl (carbon) The number is preferably from 6 to 30, more preferably from 6 to 20 carbon atoms, and particularly preferably from 6 to 12 carbon atoms, such as phenyl, p-methylphenyl, naphthyl, etc., substituted or not. a substituted amine group (preferably having a carbon number of 0 to 20, more preferably a carbon number of 0 to 10, and particularly preferably having a carbon number of 0 to 6, and examples thereof include an amine group, a methylamino group, and a dimethylamine. Base, diethylamine, dibenzylamine, etc., alkoxy (preferably having a carbon number of 1 to 20, more preferably 1 to 12 carbon atoms, and particularly preferably having a carbon number of 1 to 8) Such as methoxy, ethoxy a base, a butoxy group, or the like, an aryloxy group (preferably having a carbon number of 6 to 20, more preferably a carbon number of 6 to 16 or more preferably a carbon number of 6 to 12, and examples thereof include a phenoxy group. , 2-naphthyloxy group, etc., fluorenyl group (preferably having a carbon number of 1 to 20, more preferably 1 to 16 carbon atoms, and particularly preferably having a carbon number of 1 to 12, and examples thereof include an ethyl fluorenyl group. , benzylidene, methionyl, trimethylethenyl, etc., aryloxycarbonyl (preferably having a carbon number of 7 to 20, preferably having a carbon number of 7 to 16 and having a carbon number of 7 to 10) Particularly preferred are, for example, phenoxycarbonyl groups, and decyloxy groups (preferably having a carbon number of 2 to 20, more preferably 2 to 16 carbon atoms, and particularly preferably having a carbon number of 2 to 10). Examples thereof include a decyloxy group, a benzamidineoxy group, and the like, and a guanamine group (preferably having 2 to 20 carbon atoms, more preferably 2 to 16 carbon atoms, and particularly preferably 2 to 10 carbon atoms). Examples thereof include an acetamino group, a benzylamino group, etc., and an alkoxycarbonylamino group (preferably having a carbon number of 2 to 20, more preferably a carbon number of 2 to 16, and having a carbon number of 2). ~12 is particularly preferable, for example, a methoxycarbonylamino group, etc.), an aryloxycarbonylamino group (preferably having a carbon number of 7 to 20, and a carbon number of 7 to 16 is more preferably a carbon number). 7~12 is especially good, can be cited For example, phenoxycarbonylamino group, etc., sulfonamide group (preferably having a carbon number of 1 to 20, more preferably 1 to 16 carbon atoms, and particularly preferably having a carbon number of 1 to 12). For example, methanesulfonamide, benzenesulfonylamine, etc., and aminesulfonyl (preferably having a carbon number of 0 to 20, more preferably a carbon number of 0 to 16, and a carbon number of 0 to 12 is particularly preferable. Examples thereof include an amine sulfonyl group, a methylamine sulfonyl group, a dimethylamine sulfonyl group, a phenylamine sulfonyl group, and the like, and an aminomethyl fluorenyl group (preferably having a carbon number of 1 to 20, The carbon number is preferably from 1 to 16, and particularly preferably from 1 to 12 carbon atoms, and examples thereof include an aminomethyl fluorenyl group, a methylaminomethyl fluorenyl group, a diethylaminomethyl fluorenyl group, and a phenyl group. Aminomethylthiol or the like, an alkylthio group (preferably having a carbon number of 1 to 20, more preferably a carbon number of 1 to 16, and particularly preferably a carbon number of 1 to 12, and examples thereof include a methylthio group. , ethylthio group, etc., arylthio group (preferably having a carbon number of 6 to 20, more preferably having a carbon number of 6 to 16 and a carbon number of 6 to 12, and examples thereof include a phenylthio group, etc. ), sulfonyl group (preferably having a carbon number of 1 to 20, preferably having a carbon number of 1 to 16 and a carbon number of 1 to 12, and examples thereof include a methylsulfonyl group and a p-toluenesulfonate. Base, etc.) Sulfhydryl group (preferably having a carbon number of 1 to 20, preferably having a carbon number of 1 to 16 and a carbon number of 1 to 12, and examples thereof include a methane sulfinyl group, a sulfinyl group, etc. ), a urea group (preferably having a carbon number of 1 to 20, preferably a carbon number of 1 to 16 and a carbon number of 1 to 12, and examples thereof include a urea group, a methyl urea group, and a phenyl group). Urea group, etc., and amine phosphate group (preferably having a carbon number of 1 to 20, more preferably 1 to 16 carbon atoms, and particularly preferably having a carbon number of 1 to 12, and examples thereof include diethylphosphoric acid amine group. , phenylphosphoric acid group, etc.), hydroxyl group, hydrogenthio group, halogen atom (for example, fluorine atom, chlorine atom, bromine atom, iodine atom), cyano group, sulfonic acid group, carboxyl group, nitro group, hydroxamic acid group, sub a sulfo group, a mercapto group, an imido group or a heterocyclic group (preferably having a carbon number of 1 to 30, more preferably a carbon number of 1 to 12, and a hetero atom such as a nitrogen atom, an oxygen atom or a sulfur atom, specifically For example, imidazolyl, pyrazolyl, quinolyl, furyl, piperidinyl, Porphyrin, benzo Oxazolyl, benzimidazolyl, benzothiazolyl, etc., decane (preferably having a carbon number of 3 to 40, more preferably 3 to 30 carbon atoms, and particularly preferably having a carbon number of 3 to 24). There are, for example, trimethyldecylalkyl, triphenylsulfonylalkyl and the like. These substituents may also be further substituted. Further, when there are two or more substituents, they may be the same or different. Also, if possible, they may be joined to each other to form a loop.

X ¹ and X ^{2 each} represent a hydrogen atom or a substituent, and at least one of them is a cyano group, a carbonyl group, a sulfonyl group, or an aromatic hetero ring. The substituent T represented by the above may be applied to the substituent represented by X ¹ and X ² . Further, the substituent represented by X ¹ and X ² may be further substituted by another substituent, and the substituent may be condensed to form a ring structure.

X ¹ and X ^{2 are} preferably a hydrogen atom, an alkyl group, an aryl group, a cyano group, a nitro group, a carbonyl group, a sulfonyl group or an aromatic hetero ring, preferably a cyano group, a carbonyl group, a sulfonyl group or an aromatic heterocyclic ring. More preferably, it is a cyano group or a carbonyl group, and particularly preferably a cyano group or an alkoxycarbonyl group (-C(=O)OR (R system: an alkyl group having 1 to 20 carbon atoms, an aryl group having 6 to 12 carbon atoms, and a combination thereof) These things are made)).

The formula (103) is represented by the following formula (103-A) Things are better.

General formula (103-A)

(wherein R ¹ , R ² , R ³ , R ⁴ , R ⁵ , R ⁶ , R ⁷ , R ⁸ , R ⁹ and R ¹⁰ represent each independently a hydrogen atom or a substituent. X ¹ and X ^{2 is} equivalent to the general formula (20), and the preferred range is also the same)

R ¹ , R ² , R ³ , R ⁴ , R ⁵ , R ⁶ , R ⁷ , R ⁸ , R ⁹ and R ¹⁰ each independently represent a hydrogen atom or a substituent, and the substituent may be applied to the above substituent. T. Further, these substituents may be further substituted by other substituents, and the substituents may also be condensed to form a ring structure.

R ¹ , R ² , R ⁴ , R ⁵ , R ⁶ , R ⁷ , R ⁹ and R ¹⁰ are a hydrogen atom, an alkyl group, an alkenyl group, an alkynyl group, an aryl group, a substituted or unsubstituted amino group, The alkoxy group, the aryloxy group, the hydroxyl group, and the halogen atom are preferred, and a hydrogen atom, an alkyl group, an aryl group, an alkoxy group, an aryloxy group or a halogen atom is preferred, and a hydrogen atom and an alkyl group having 1 to 12 carbon atoms are preferred. The base is more preferably a hydrogen atom or a methyl group, and a hydrogen atom is preferred.

R ³ and R ^{8 are} preferably a hydrogen atom, an alkyl group, an alkenyl group, an alkynyl group, an aryl group, a substituted or unsubstituted amino group, an alkoxy group, an aryloxy group, a hydroxyl group, a halogen atom, preferably a hydrogen atom, An alkyl group having 1 to 20 carbon atoms, an amine group having 0 to 20 carbon atoms, an alkoxy group having 1 to 12 carbon atoms, an aryloxy group having 6 to 12 carbon atoms, and a hydroxyl group, more preferably a hydrogen atom or a carbon number of 1~ The alkyl group of 12 and the alkoxy group having 1 to 12 carbon atoms are particularly preferably a hydrogen atom.

The compound of the formula (103) represented by the following formula (103-B) is preferred.

General formula (103-B)

(wherein R ³ and R ₈ are the same as the formula (103-A), and the preferred range is also the same. X ₃ means a hydrogen atom or a substituent)

X ₃ represents a hydrogen atom or a substituent, and the substituent T described above can be used as the substituent. Further, if possible, such substituents may be substituted by other substituents. X _{3 is} preferably a hydrogen atom, an alkyl group, an aryl group, a cyano group, a nitro group, a carbonyl group, a sulfonyl group or an aromatic heterocyclic ring, and preferably a cyano group, a carbonyl group, a sulfonyl group or an aromatic heterocyclic ring. More preferably, a cyano group or a carbonyl group is a cyano group or an alkoxycarbonyl group (-C(=O)OR (R system: an alkyl group having 1 to 20 carbon atoms, an aryl group having 6 to 12 carbon atoms, and the like) It is a good thing.)

The compound of the formula (103) is preferably a compound represented by the following formula (103-C).

General formula (103-C)

(wherein R ³ and R ₈ are equivalent to the formula (103-A), and the preferred range is also the same. R ²¹ is an alkyl group having 1 to 20 carbon atoms)

R ²¹ lines when R ³ and R ₈ are both hydrogen, to an alkyl group having 2 to 12 carbon atoms, preferably of the order of 12 ~ 4 alkyl group is preferred, to carbon atoms of an alkyl group is more preferably 6 to 12 The n-octyl group, the third octyl group, the 2-ethylhexyl group, the n-decyl group and the n-dodecyl group are particularly preferred, and the 2-ethylhexyl group is most preferred.

In the case of R ²¹ and R ³ and R ₈ , the alkyl group having a molecular weight of 300 or more and having a carbon number of 20 or less is preferably an alkyl group having a molecular weight of 300 or more and a compound of the formula (103-C).

The compound of the formula (103) of the present invention can be synthesized according to the method described in Jounal of American Chemical Society, Vol. 63, page 3452 (1941).

Specific examples of the compound represented by the formula (103) are given below, but the present invention is not limited thereto.

(release agent)

Further, in order to reduce the load at the time of peeling, it is preferred to add a release agent.

The surfactant is effective as a surfactant, and is not particularly limited as long as it is a phosphate system, a sulfonic acid system, a carbonic acid system, a nonionic system or a cationic system. For example, it is described in Japanese Laid-Open Patent Publication No. SHO 61-243837, No. 2000-99847. The amount of addition is preferably 0.1% by mass or less relative to the deuterated cellulose.

Further, in the description of the release agent, JP-A-2003-055501 discloses a deuterated cellulose solvent, and in order to prevent white turbidity of the deuterated cellulose solution, the peeling property and the film surface shape in the production of a film are improved, and the non-chlorine system is used. The deuterated cellulose obtained by dissolving a solvent contains an additive selected from the group consisting of a partial hydrochloric acid partial acid ester having an acid dissociation index pK _A of 1.93 to 4.5, an alkali metal salt, and a salt metal salt.

Also, regarding the additive, JP-A-2003-128838 discloses A deuterated cellulose solution containing 0.1 to 10% by mass of a crosslinking agent having at least one type and at least one kind of a crosslinking agent in order to improve the stripping property, the surface shape, and the film strength. The base of the active hydrogen reaction.

Further, in Japanese Laid-Open Patent Publication No. 2003-165868, the proposal discloses a The film is added with additives, has good moisture permeability, and has dimensional stability.

[surface treatment]

The transparent film of the present invention can be adhered to the surface of each of the functional layers (for example, the primer layer and the back layer) by surface treatment. For example, a light-emitting discharge, an ultraviolet irradiation treatment, a corona treatment, a flame treatment, an acid or an alkali treatment can be used. In this luminescent discharge treatment, low-temperature plasma can be produced under a low-pressure gas of 10 ^-3 to 20 Torr, and plasma treatment can also be performed under atmospheric pressure. The plasma-excited gas system refers to a plasma excitation gas under the above conditions, and examples thereof include argon, helium, neon, krypton, xenon, nitrogen, carbon dioxide, chlorofluorocarbons such as tetrafluoromethane, and the like. mixture. These are described in detail in the Inventor's Association Technical Bulletin No. 2001-1745 (issued March 15, 2001, and the Invention Association) on pages 30 to 32, and can be suitably used in the present invention.

[Contact angle of film surface by alkali alkalization treatment]

When the transparent film of the present invention is subjected to polarizing plate processing, one of the effective methods for surface treatment may be alkalized alkali treatment. At this time, the water contact angle of the surface of the film after alkali alkalization treatment is preferably 55 degrees or less. It is preferably 50 degrees or less, and more preferably 45 degrees or less. In the evaluation method of the contact angle, the water-repellent property can be evaluated by a method in which a water droplet having a diameter of 3 mm is dropped on the surface of the film after alkali alkalization treatment, and the angle between the surface of the film and the water droplet is determined.

[function layer]

The transparent film of the present invention can be used for optical applications. In particular, the optical use is preferably a liquid crystal display device, and more preferably, the liquid crystal display device is formed by: a liquid crystal cell holding a liquid crystal between the two electrode substrates; and a polarizing element disposed on both sides of the liquid crystal cell; An optical compensation sheet is disposed between the liquid crystal cell and the polarizing element. These liquid crystal display devices are preferably TN, IPS, FLC, AFLC, OCB, STN, ECB, VA, and HAN.

In this case, when a transparent film is used for the optical use described above, various functional layers can be imparted. These include, for example, an antistatic layer, a cured resin layer (transparent hard coat layer), an antireflection layer, an easy adhesion layer, an antiglare layer, an optical compensation layer, an alignment layer, a liquid crystal layer, and the like. These functional layers of transparent film and materials thereof can be used, and surfactants, slip agents, matting agents, antistatic layers, hard coat layers, and the like can be cited, and the Invention Association published Technical Bulletin No. 2001-1745 (2001). It is described in detail on pages 32 to 45 of the publication of the March 15th, the Invention Association, and can be suitably used in the present invention.

[Polarizer]

The method for producing a polarizing plate of the present invention, in particular, can be made into strips In the case of a shape, it is not particularly limited and can be produced by a usual method. There is a method in which a transparent film obtained by treating a base is adhered to both surfaces of a polarizer prepared by immersing a polyvinyl alcohol film in an iodine solution using a completely saponified polyvinyl alcohol aqueous solution. For example, JP-A-6-94915 and JP-A-6-118232 may be used to perform an easy-adhesion process instead of an alkali treatment.

Examples of the adhesive used for the protective film-treated surface and the polarizer include a polyvinyl alcohol-based adhesive such as polyvinyl alcohol or polyvinyl butyral, and a vinyl latex such as butyl acrylate.

The polarizing plate is composed of a polarizer and a protective film that protects both surfaces thereof. The protective film is bonded to the surface of the polarizing plate, and the separator is bonded to the opposite surface. The purpose of the protective film and the separation film is to protect the polarizing plate when the polarizing plate is shipped, the product is inspected, and the like. At this time, the purpose of the protective film is to protect the surface of the polarizing plate and to bond it, and to use it on the opposite side of the surface of the polarizing plate to which the liquid crystal panel is bonded. Moreover, the use of the separator is for covering the adhesive layer of the liquid crystal panel, and it is used on the surface side of the polarizing plate to which the liquid crystal panel is bonded.

The method for bonding a transparent film of the present invention to a polarizer is used The method of roll-to-roll to fit a long film is preferable because the productivity is high and the variation of the characteristics of the polarizing plate (especially the shaft angle and the light leakage) is extremely small. Further, the absorption axis of the elongated polarizer is parallel to the longitudinal direction, and the retardation axis of the elongated transparent film is orthogonal or parallel to the longitudinal direction.

Further, a polarizing plate made of a polarizing plate under crossed Nicols is used when the retardation axis of the transparent film of the present invention and the axis of the absorption axis of the polarizer or the axis of the transmission axis are more than 10 degrees. , polarized plates in crossed Nicols The lower polarization performance is reduced to cause light leakage, and when combined with the liquid crystal cell, sufficient black level or contrast cannot be obtained. Therefore, the slow axis direction of the transparent film of the present invention and the absorption axis or the direction of the transmission axis of the polarizing plate The axis offset angle is within 10 degrees, preferably within 5 degrees, and preferably within 1 degree.

The measurement of the axial offset angle was performed by peeling off the transparent film and the polarizer on the prepared polarizing plate, and performing the following measurement.

Determination of the axial angle of the polarizer: Using a polarizer (A) of a known axis, the photon (B) to be measured is superimposed on the polarizer (A) to determine the position at which the transmitted light becomes the smallest, and the direction coincides with the absorption axis of the polarizer (A). As the transmission axis of the polarizer (B), the straight direction is taken as the absorption axis.

Determination of the retardation axis of the transparent film: The shaft angle of the transparent film was measured by KOBRA 21DH (Oji Scientific Instruments Co., Ltd.), and the angle of the slow phase axis in the longitudinal direction was measured.

The polarizing plate of the present invention is 400 to 700 at 60 ° RH at 25 ° C The sheet penetration rate TT, the parallel penetration ratio PT, the orthogonal transmittance CT, and the degree of polarization P of the nano are preferably at least one of the following formulas (a) to (d). (Also, "400~700 nm" means the average value of the range of scanning from 400 to 700 nm. The following is the same)

The veneer penetration rate refers to the transmittance of one piece of the polarizing plate, and the parallel transmittance refers to the transmittance measured by the two polarizing plates being combined in parallel, and the orthogonal transmittance refers to two pieces. The transmittance measured under the condition that the transmission axis of the polarizing plate is orthogonal.

(a) 40.0≦TT≦45.0

(b) 30.0≦PT≦40.0

(c) CT≦2.0

(d) 95.0≦P

The veneer penetration rate TT, the parallel penetration rate PT, and the orthogonal transmittance CT are preferably 40.5 ≦ TT ≦ 45.0, 32.0 ≦ PT ≦ 40.0, CT ≦ 1.5, and more preferably 41.0 ≦ TT ≦ 45.0. 34.0≦PT≦40.0, CT≦1.3. The degree of polarization P is preferably 95.0% or more, more preferably 96.0% or more, and still more preferably 97.0% or more.

In the polarizing plate of the present invention, when the orthogonal transmittance of the wavelength λ is T(λ), T( ₃₈₀ ), T( ₄₁₀ ), and T( ₇₀₀ ) satisfy the following formulas (e) to (g). At least one or more are preferred.

(e)T( ₃₈₀ )≦2.0

(f)T( ₄₁₀ )≦1.0

(g) T ( ₇₀₀ ) ≦ 0.5

Preferably, T( ₃₈₀ )≦1.95, T( ₄₁₀ )≦0.9, T( ₇₀₀ )≦0.49, more preferably T( ₃₈₀ )≦1.90, T( ₄₁₀ )≦0.8, T( ₇₀₀ )≦0.48.

In the polarizing plate of the present invention, the amount of change in the orthogonal transmittance of ΔCT and the change in the degree of polarization ΔP of 400 to 700 nm in the case of standing at 500 ° C for 95 hours under conditions of 60 ° C and 95% RH is satisfied. At least one of the above formulas (h) to (i) is preferred.

(h)-6.0≦△CT≦6.0

(i)-10.0≦△P≦0.0

(Where, the amount of change indicates the value after the test is subtracted from the value before the test)

Preferably, it is -5.8 ≦ ΔCT ≦ 5.8, -9.5 ≦ ΔP ≦ 0.0, more preferably -5.6 ≦ △ CT ≦ 5.6, -9.0 ≦ ΔP ≦ 0.0.

In the polarizing plate of the present invention, under the condition of 60° C. and 90% RH, the change of the orthogonal transmittance of ΔCT and the degree of change of polarization ΔP of 400 to 700 nm in the case of standing for 500 hours is satisfied. At least one of the above formulas (i) to (k) is preferred.

(j)-3.0≦△CT≦3.0

(k)-5.0≦△P≦0.0

(Where, the amount of change indicates the value after the test is subtracted from the value before the test)

Preferably, it is -2.0 ≦ ΔCT ≦ 2.0, -0.5 ≦ ΔP ≦ 0.0, more preferably -0.2 ≦ ΔCT ≦ 0.2, -2.0 ≦ ΔP ≦ 0.0.

In the case where the polarizing plate of the present invention is left at 500 ° C for 500 hours, the amount of change in the orthogonal transmittance of ΔCT of 400 to 700 nm and the amount of change in polarization degree ΔP are in accordance with the following formula. At least one of (l) to (m) is preferred.

(l)-3.0≦△CT≦3.0

(m)-2.0≦△P≦0.0

(Where, the amount of change indicates the value after the test is subtracted from the value before the test)

Preferably, it is -2.0 ≦ ΔCT ≦ 2.0, -0.5 ≦ ΔP ≦ 0.0, more preferably -0.2 ≦ ΔCT ≦ 0.2, -0.2 ≦ ΔP ≦ 0.0.

The plate penetration rate TT, the parallel penetration rate PT, and the orthogonal transmittance CT of the polarizing plate were measured using UV3100PC (manufactured by Shimadzu Corporation) in the range of 380 nm to 780 nm, TT, PT, and CT. Both are average values of 10 measurements (average of 400 nm to 700 nm). Polarized plate durable The test was carried out in the following two states: (1) only the polarizing plate, and (2) the adhesive was placed between the polarizing plates and the glass. Only the measurement of the polarizing plate was carried out by combining and arranging the transparent film of the present invention between the two polarizers, and two pieces of the same material were prepared and measured. The object attached to the glass was attached to a glass with a polarizing plate attached to the glass side of the transparent film of the present invention to prepare two pieces of a sample (about 5 cm × 5 cm). The veneer transmittance measurement was performed by setting the film measurement of the swatch toward the light source. Each of the two pieces was measured, and the average value thereof was used as the veneer penetration rate.

The liquid crystal display device is usually disposed between two polarizing plates. A substrate having a liquid crystal, but the polarizing plate protective film to which the optical film of the present invention is applied can be excellently displayed in any portion. In particular, since the polarizing plate protective film on the display surface of the liquid crystal display device is provided with a transparent hard coat layer, an antiglare layer, an antireflection layer, and the like, it is particularly preferable to use the polarizing plate protective film in this portion.

[Use (optical compensation film)]

The polarizing plate of the present invention can be used in a wide variety of applications, and is particularly effective for use with an optical compensation film of a liquid crystal display device. Further, the optical compensation film is generally used in a liquid crystal display device, and is an optical material that compensates for a phase difference, and is equivalent to a phase difference plate or an optical compensation sheet. The optical compensation film has birefringence and is used for the purpose of eliminating the coloration of the display screen of the liquid crystal display device, improving the viewing angle characteristics, and the like.

When the polarizing plate of the present invention is used as the polarizing plate-integrated optical compensation film of the liquid crystal display device, Re and Rth of the optical anisotropic layer provided together are Re ₍₆₃₀₎ =0 to 200 nm, and |Rth _{(630) )} = 0~400 nm is preferred, and any optically directional layer can be used in this range. The optical performance or driving manner of the liquid crystal cell of the liquid crystal display device using the polarizing plate of the present invention is not limited, and any optical anisotropic layer required for the optical compensation film may be provided together. The optically anisotropic layer provided together may be formed of a liquid crystal compound-containing composition or a polymer film having birefringence.

The liquid crystal compound is preferably a discotic liquid crystalline compound or a rod-like liquid crystalline compound.

(disc liquid crystal compound)

Examples of the discotic liquid crystalline compound which can be used in the present invention include various documents (C. Destrade et al., Mol. Crysr. Cryst., vol. 71, p. 111 (1981); edited by the Chemical Society of Japan, Quarterly Chemistry, No. 22, Liquid Crystal Chemistry, Chapter 5, Chapter 10, Section 2 (1994); B. Kohn et al., Angew. Chem. Soc. Chem. Comm., p. 1794 (1985); The compound described in J. Zhang et al., J. Am Chem. Soc., vol. 116, p. 2655 (1994).

The dish-like liquid crystal compound is capable of having a polymerizable group It is preferable to fix by polymerization. For example, a disc-shaped center of a discotic liquid crystalline compound may be combined with a polymerizable group as a substituent. However, when the disc-shaped center is directly bonded to a polymerizable group, the alignment system is preserved at the time of polymerization reaction. Have difficulty. Therefore, it is preferred to have a linking group between the center of the disk and the polymerizable group. In other words, the discotic liquid crystalline compound having a polymerizable group is preferably a compound represented by the following formula.

D(-LP) _n

In the formula, D is a disc-shaped center, L is a bivalent linking group, and P is polycondensed. A suitable group, n is an integer from 4 to 12. In a preferred embodiment of each of the disc-shaped center (D), the divalent linking group (L), and the polymerizable group (P) in the above formula, (D1) to (J1) The contents described in the publications of D15) and (L1) to (L25) and (P1) to (P18) can be suitably used.

(rod-like liquid crystalline compound)

Examples of the rod-like liquid crystal compound usable in the present invention include a methylimine, an azogen group, a cyanobiphenyl, a cyanophenyl ester, a benzoate, a cyclohexanecarboxylic acid phenol ester. Class, cyanophenylcyclohexane, cyano substituted phenyl pyrimidine, alkoxy substituted phenyl pyrimidine, phenyl Alkane, diphenylacetylene, and alkenylcyclohexylbenzonitrile. Not only the above low molecular liquid crystalline compound but also a polymer liquid crystalline compound can be used.

In the optically anisotropic layer, rod-like liquid crystalline molecules are aligned The state is fixed to be good and is fixed by polymerization. Examples of the polymerizable rod-like liquid crystalline compound which can be used in the present invention are contained in Makromol. Chem., Vol. 190, p. 2255 (1989), Advanced Materials Vol. 5, p. 107 (1993), U.S. Patent No. 4683327 No. 5622648, the same as No. 5770107, International Publication No. 95/22586, the same as No. 95/24455, the same as 97/00600, the same as 98/23580, the same as 98/52905 The compounds described in each of the publications of the Japanese Patent Publication No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei.

(optical anisotropic layer composed of polymer film)

The optically anisotropic layer can also be formed from a polymer layer. The polymer film is formed of a polymer capable of exhibiting optical anisotropy. Examples of such polymers include polyamines, polyimines, polyesters, polyether ketones, polyamidiamine polyester phthalimides, and polyaryl ether ketones, polyolefins (eg, polyethylene, poly Propylene Ethylene-based polymers), polycarbonates, polyallyl esters, polyfluorenes, polyvinyl alcohols, polymethacrylates, polyacrylates, and cellulose esters (eg, cellulose acetate, cellulose diacetate). Further, a copolymer of these polymers or a polymer mixture can also be used.

The optical anisotropy of the polymer film is obtained by extension It is better. The extension is preferably a uniaxial extension or a biaxial extension. Specifically, it is preferable to use a longitudinal uniaxial extension using a circumferential speed difference of two or more rollers, or a tenter extending to extend in the width direction on both sides of the polymer film, and to combine such biaxial stretching. Further, two or more polymer films may be used, and the optical properties of the entire two or more films may satisfy the above conditions. In order to reduce the unevenness of birefringence, the polymer film is preferably produced by a solvent casting method. The thickness of the polymer film is preferably from 20 to 500 μm, and most preferably from 40 to 100 μm.

Also, an optically anisotropic layer is formed which will dissolve in the solvent A method in which a solution of a polymer material is applied to a substrate, and a solvent is dried and thinned can also be suitably used. In this case, the method of using the extended polymer film and the substrate to exhibit optical anisotropy as an optically anisotropic layer may be suitably used, and the transparent film of the present invention may be suitably used as the substrate. Further, the polymer film is produced on another substrate, and after peeling off the polymer film from the substrate, it is preferably bonded to the transparent film of the present invention and used together as an optically oriented layer. This method can be thinned The thickness of the polymer film, the thickness of the polymer film is preferably 50 μm or less, preferably 0.5 to 20 μm, more preferably 0.5 to 10 μm.

(Common composition of liquid crystal display)

The liquid crystal display is composed of: a liquid crystal cell, which holds liquid crystal between two electrode substrates; a polarizing element disposed on both sides of the liquid crystal cell; and at least one optical compensation sheet disposed in the liquid crystal cell and the polarizing element Between the two.

The liquid crystal layer of the liquid crystal cell is usually formed by encapsulating a liquid crystal in a space formed by sandwiching a spacer between the two substrates. The transparent electrode layer forms a transparent film containing a conductive substance on the substrate. The liquid crystal cell may further be provided with a gas barrier layer, a hard coat layer, or (for a transparent electrode layer) to adhere to an undercoat. These layers are typically disposed on a substrate. The substrate of the liquid crystal cell typically has a thickness of 50 microns to 2 mm.

(Type of liquid crystal display device)

The transparent film of the present invention can use a wide variety of liquid crystal cells in a display mode. Proposals such as TN (Twisted Nematic), IPS (In-Plane Switching), FLC (Ferroelectric Liquid Crystal), AFLC (Anti-ferroelectric Liquid Crystal) , OCB (Optically Compensatory Bend), STN (Super Twisted Nematic), VA (Vertically Aligned), ECB (Electrically Controlled Birefringence), and HAN (Mixed Alignment) Various display modes such as Nebid Aligned Nematic). The transparent film of the present invention can be effectively used in a liquid crystal display device of any one display mode. also, It is effective for any type of liquid crystal display device of the transmissive type, the reflective type, and the semi-transmissive type.

(TN type liquid crystal display device)

The transparent film of the present invention can be used as a support for an optical compensation sheet for a TN liquid crystal display device having a liquid crystal cell of a TN mode. Liquid crystal cells and TN type liquid crystal display devices in the TN mode have long been known. An optical compensation sheet for use in a TN type liquid crystal display device is described in each of Japanese Laid-Open Patent Publication No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. Also, it is described in the paper by Mori et al. (Jpn. J. Appl. Phys. Vol. 36 (1997) p. 143, Jpn. J. Appl. Phys. Vol. 36 (1997), p. 1068. .

(STN type liquid crystal display device)

The transparent film of the present invention can be used as a support for an optical compensation sheet for an STN liquid crystal display device having a liquid crystal cell of an STN mode. In general, the rod-like liquid crystal molecules in the liquid crystal cell of the STN type liquid crystal display device are distorted in the range of 90 to 360 degrees, and the refractive index of the rod-like liquid crystal molecules is different in the directivity (Δn) and the gap between the liquid crystal cells (d The product (Δnd) is in the range of 300 to 1500 nm. An optical compensation sheet used in an STN type liquid crystal display device is described in Japanese Laid-Open Patent Publication No. 2000-105316.

(VA type liquid crystal display device)

The transparent film of the present invention can be used as a support for an optical compensation sheet, and is particularly advantageous for use in a VA type liquid crystal display device having a liquid crystal cell of a VA mode. For the optical compensation sheet of the VA type liquid crystal display device, the Re hysteresis value is 0 to 150 nm, the Rth hysteresis value is preferably 70 to 400 nm, and the Re hysteresis value is preferably 20 to 70 nm. In VA type liquid crystal display When two optically anisotropic polymer films are used, the Rth hysteresis value in the film is preferably from 70 to 250 nm. When an optically anisotropic polymer film is used for a VA type liquid crystal display device, the Rth hysteresis value in the film is preferably 150 to 400 nm. The VA type liquid crystal display device may be, for example, an alignment division method described in Japanese Laid-Open Patent Publication No. Hei 10-123576.

(IPS type liquid crystal display device and ECB type liquid crystal display device)

The transparent film of the present invention can be used as a support for an optical compensation sheet, and can be used for an IPS type liquid crystal display device having an IPS and ECB mode, an ECB type liquid crystal display device, or a protective film as a polarizing plate. In these modes, when the black display is performed, the liquid crystal material is in a substantially parallel alignment state, and liquid crystal molecules are aligned in parallel with the substrate surface and black is displayed when no voltage is applied. In these states, the polarizing plate using the transparent film of the present invention contributes to the enlargement of the viewing angle and the improvement of the contrast. In these states, the hysteresis value of the protective film of the polarizing plate and the optically anisotropic layer disposed between the protective film and the liquid crystal cell is preferably set to be twice or less the value of the Δn‧d of the liquid crystal layer. Further, the absolute value of the Rth value |Rth| is set to 25 nm or less, preferably 20 nm or less, and more preferably 15 nm or less. Therefore, it is advantageous to use the transparent film of the present invention.

(OCB type liquid crystal display device and HAN type liquid crystal display device)

The transparent film of the present invention can be used as a support for an optical compensation sheet, and is advantageous for use in an OCB type liquid crystal display device having an OCB mode liquid crystal cell or a HAN type liquid crystal display device having a HAN mode liquid crystal cell. For the optical compensation sheet of the OCB type liquid crystal display device and the HAN type liquid crystal display device, the absolute value of the hysteresis value is the smallest in the direction without the optical complement It is better that the film is not in the normal direction. The optical properties of the optical compensation sheet used in the OCB type liquid crystal display device and the HAN type liquid crystal display device also depend on the optical properties of the optical anisotropic layer, the optical properties of the support, and the configuration of the optical anisotropic layer and the support. . An optical compensation sheet for use in an OCB type liquid crystal display device or a HAN type liquid crystal display device is described in Japanese Laid-Open Patent Publication No. Hei 9-197397. Also, it is described in the paper by Mori et al. (Jpn. J. Appl. Phys. Vol. 38 (1999) p. 2837).

(Reflective liquid crystal display device)

The transparent film of the present invention can be used as a support for an optical compensation sheet, and is useful for a reflective liquid crystal display device of a TN type, an STN type, or a HAN type GH (Guest-Host) guest type. These display modes have long been known. The TN-type reflective liquid crystal display device is described in Japanese Laid-Open Patent Publication No. Hei 10-123478, No. 98/48320, and No. 3022477. An optical compensation sheet used for a reflective liquid crystal display device is described in International Publication No. 00/65384.

(Other liquid crystal display devices)

The transparent film of the present invention can be used as a support for an optical compensation sheet, and is preferably used in a liquid crystal display device of an ASM (Axially Symmetric Aligned Microcell) mode. The liquid crystal cell of the ASM mode has a feature that the thickness of the liquid crystal cell can be maintained by the resin spacer which can be adjusted in position. Other properties are the same as those of the TN mode. The liquid crystal cell and the ASM type liquid crystal display device of the ASM mode are described in the paper by Kume et al. (Kume et al., SID 98 Digest 1089 (1998).

(hard coating film, anti-glare film, anti-reflection film)

The transparent film of the present invention is suitably applied to a hard coat film, an antiglare film, and an antireflection film. In order to improve the visibility of the flat panel display device of LCD, PDP, CRT, EL, etc., the transparent side or both sides of the present invention may be provided with any or all of a hard coat layer, an anti-glare layer and an anti-reflection layer. . Such a hard coating film, an anti-glare film, and an anti-reflection film are preferably in a state in which they are described in detail in the Inventor's Association Publication No. 2001-1745 (issued on March 15, 2001, and the Invention Association) on pages 54 to 57. The transparent film of the invention can be suitably used.

[Examples]

The invention will be specifically described below by way of examples. The reagents, ratios, and operations can be appropriately changed without departing from the spirit of the invention. Therefore, the scope of the present invention is not limited to the specific examples below.

[Example 1] (Manufacture of transparent film)

The material of the transparent film of the present invention uses deuterated cellulose.

(Manufacture of deuterated cellulose sample 101)

As the deuterated cellulose, two types of Ce-1 (Ac: OH = 2.94: 0.06) and Ce-2 (Ac: Pro: OH: 1.7: 1.0: 0.3) having different degrees of deuteration were used. Here, the Ac line in the parentheses represents an acetamyl substituent, a Pro-based propyl group substituent, and an OH-based unsubstituted hydroxy group, and the ratio is the ratio of the degree of enthalpy.

(combination of deuterated cellulose solution)

The deuterated cellulose (Ce) used, the compound (KI) which reduces optical anisotropy, and the wavelength dispersion adjusting agent (HB) are shown in Table 1.

The above deuterated cellulose solution was cast using a tape casting machine. will A film having a residual solvent amount of 30% was peeled off from the tape and dried at 130 ° C for 40 minutes to obtain a cellulose oxide film. The residual cellulose film of the finished cellulose film had a residual solvent amount of 0.1% and a film thickness of 80 μm.

(Manufacture of deuterated cellulose samples 102~104)

The same as Sample 101 except that the deuterated cellulose sample (Ce) to be used, the compound (KI) for reducing the optical anisotropy, the wavelength dispersion adjusting agent (HB), and the addition amount were changed as shown in Table 1. Made in the field. Further, the prepared sample was measured by the above-described method at a measurement wavelength of 630 nm.

The measurement results of the production conditions and optical characteristics of the sample of the present invention produced in the above examples are shown in Table 1.

(Manufacture of polarizing plate (H101~105))

The long transparent film sample of the present invention was continuously immersed at 1.5 ° C for 2 minutes through a sodium hydroxide aqueous solution having a predetermined concentration of 1.5. It was washed in a water bath at room temperature, and neutralized at 30 ° C using a predetermined concentration of sulfuric acid. Again, it was washed in a water bath at room temperature, and dried at a temperature of 100 °C. This was carried out to saponify the surface of the transparent film.

Next, a polyvinyl alcohol film having a thickness of 80 μm was continuously stretched five times in an aqueous iodine solution, and dried to obtain a polarizer having a thickness of 20 μm. A 3% aqueous solution of polyethylene (PVA-117H manufactured by Kuraray) was used as an adhesive to prepare a saponified transparent film sample and a commercially available cellulose film (FUJITEC TD80UF, Fuji Photo Film Co., Ltd., film thickness). 80 micron, Re value is 3 nm, Rth value is 50 nm), the polarizer is placed in the middle, and the package is bonded in and out, and the film length is 500 meters, the absorption axis is the length direction, and the retardation axis is A polarizing plate protected by a film on both sides in a direction orthogonal to the longitudinal direction.

(Manufacture of polarizing plate (H106, H107))

H106 and H107 were obtained by batch stretching to obtain a polarizing plate. The manufacturing system was obtained from the above-mentioned transparent film and commercially available deuterated cellulose film (FUJITEC TD80UF, Fuji Photo Film Co., Ltd., film thickness: 80 μm, Re value: 3 nm, Rth value: 50 nm), and cut out A4. The size is formed by sandwiching the extended photon of the A4 size. The saponification conditions and the adhesive were the same as those used in the production of the polarizing plate H101.

The performance of the polarizing plate is shown in Table 2 and Table 3. Use the volume to fit When it was out, the axial shift was small and the characteristics were good, and the polarizing plate characteristics of the present embodiment were found to be good. However, it is also known that if the film thickness of the sample is thin, Poor durability.

(Package panel evaluation)

The polarizing plate of the present invention was packaged in a liquid crystal display device and evaluated.

[IPS mode] <IPS liquid crystal cell polarizing plate>

An ARTON film (manufactured by JSR Corporation) was used to form an optical compensation film of Re=270 nm and Rth=0 nm. On the transparent film side of the polarizing plate of the present invention, the retardation axis of the optical compensation film was The polarizing plate has an absorption axis in which the absorption axes are uniform, and a polarizing plate-integrated optical compensation film is obtained.

<Manufacture of IPS liquid crystal cells>

On one of the glass substrates, an electrode was placed so as to have a distance between adjacent electrodes of 20 μm, and a polyimide film was provided as an alignment film on the glass substrate, and rubbing treatment was performed. A polyimide film was provided on one surface of a separately prepared glass substrate, and rubbing treatment was performed as an alignment film. The alignment films of the two glass substrates were opposed to each other, and the interval (gap; d) of the substrates was 3.9 μm, and the rubbing directions of the two glass substrates were overlapped and bonded, and then the refractive index was oriented in an off-axis ( Δn) is a nematic liquid crystal composition having a dielectric constant (Δε) of 0.0769 and a positive dielectric constant (Δε) of 4.5. d. of the liquid crystal layer The Δn value is 300 nm.

The light source side of the liquid crystal cell is bonded to the transparent film side of the polarizing plate of the present invention on the side of the transparent film of the present invention so that the slow axis of the liquid crystal cell coincides with the absorption axis of the polarizing plate. The optical compensation film side of the plate-integrated optical compensation film was bonded to the liquid crystal cell side by an adhesive, and the absorption axis was bonded to the opposite polarizing plate on the opposite side of the liquid crystal cell to form an IPS liquid crystal display device.

[VA mode] (Optical compensation film for VA)

Using the transparent film sample of the present invention, an optical compensation film sample was produced in accordance with the method described in Example 1 of JP-A-2003-315541. Will be composed of 2,2'-bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride (6FDA), and 2,2'-bis(trifluoromethyl)-4,4'-ethylaminobiphenyl (TFMB) Synthesized polyethylenimine having a weight average molecular weight (Mw) of 70,000 and Δn of about 0.04, using cyclohexanone as a solvent to prepare a 25 wt% solution, and coating the solution in the examples or comparing The transparent film samples 101 to 104 and 001 to 004 produced in the examples were used. Next, after heat-treating at 100 ° C for 10 minutes, an optical compensation film obtained by coating a polyimide film having a degree of 6 μm on the transparent film of the present invention was obtained by stretching at 160 ° C and 15% in the longitudinal direction. The optical compensation film has optical characteristics of Re=72 nm, Rth=220 nm, an offset angle of the alignment axis of ±0.3 degrees, and an optical compensation film having a birefringent layer of nx>ny>nz.

(Package evaluation of VA type liquid crystal display)

The optical compensation film obtained in the above examples was coated on the polyimide side, and the alkali-alkali-treated polyvinyl alcohol-based adhesive was adhered to the polarizer to directly adhere to the polarizer. At this time, the n× direction of the optical compensation film is bonded to the absorption axis of the polarizing plate so as to be orthogonal to each other. The optical compensation film is bonded to the VA liquid crystal panel using an adhesive on the liquid crystal cell side. Further, on the opposite side of the liquid crystal cell, the adhesive is interposed so that the absorption axis of the polarizing plate is orthogonal to each other, and only the polarizing plate is bonded to the VA liquid crystal.

[Panel evaluation]

<Evaluation of retardation film and light leakage measurement of the liquid crystal display device produced Set>

The viewing angle dependence of the transmittance of the produced liquid crystal display device was measured. The angle of suppression is from 10 to 80 degrees from the front to the oblique direction, and the azimuth is measured every 10 to 360 degrees in the horizontal right direction (0 degrees). It is known that the luminance at the time of black display increases as the angle of depression increases from the front direction, and the light leakage transmittance also increases, reaching a maximum value in the vicinity of the suppression angle of 70 degrees. Further, it is also known that as the black display transmittance increases, the contrast deteriorates. Therefore, the viewing angle characteristics are evaluated by the front black display transmittance and the maximum value of the light leakage transmittance of 60 degrees.

Further, in the durability test, the display unevenness of the contrast, the color tone, and the like after the treatment at 90 ° C, 90%, 60 ° C, 95%, and 80 ° C for 500 hours was observed. The results obtained are shown in Table 4.

In the polarizing plates H101 to 105 of the present invention, since the axial shift is small and the durability is high, it is known that not only the viewing angle characteristics but also the occurrence of unevenness is slight, which is good.

Display characteristic evaluation

(viewing angle characteristics)

◎: The difference in viewing angle characteristics is very slight and good

○: The difference in viewing angle characteristics is small

×: The difference in viewing angle characteristics is large

(uneven)

◎: unevenness is very slight and good

○: unevenly small

△: a little more uneven

×: unevenly large

Claims (27)

A long strip-shaped polarizing plate characterized by having long strip-shaped polarizers having an absorption axis slightly parallel to the longitudinal direction; and containing deuterated cellulose as a polymer material, having a slight vertical or slightly parallel to the length direction The retardation value Re of the phase axis and the film surface and the hysteresis value Rth of the film thickness direction of the film satisfy the long transparent film of the formula (i) (ii) having a thickness of 20 to 200 μm, and the absorption axis of the polarizer The axis offset angle of the retardation axis of the transparent film is laminated within 10 degrees, (i) 0 ≦ Re ₍₆₃₀₎ ≦ 10 (ii) | Rth ₍₆₃₀₎ | ≦ 20 [where, Re _(λ) The hysteresis value (unit: nm) at the front side of the wavelength _λ nm, Rth _(λ) is a hysteresis value (unit: nm) in the film thickness direction of the wavelength _λ nm]. The elongated polarizing plate of claim 1, wherein an absorption axis of the polarizer and an axis of the slow axis of the transparent film are within an angle of 7 degrees. The strip-shaped polarizing plate of claim 2, wherein the axis offset angle is within 5 degrees. The strip-shaped polarizing plate of claim 3, wherein the axis offset angle is within 1 degree. A long strip polarizer as claimed in claim 1, wherein |Rth ₍₆₃₀₎ |≦15. For example, the strip-shaped polarizing plate of claim 5, wherein -15 ≦ Rth ₍₆₃₀₎ ≦-2.1. The strip-shaped polarizing plate of claim 1 or 2, which contains a compound which reduces optical anisotropy in the transparent film. The strip-shaped polarizing plate of claim 7, wherein the compound which reduces optical anisotropy is a compound represented by any one of the formulae (1) to (3), and the formula (1) In the formula (1), R ^1a represents an alkyl group or an aryl group, and R ^2a and R ^3a each independently represent a hydrogen atom, an alkyl group or an aryl group, and further, the number of carbon atoms of R ^1a , R ^2a and R ^3a The sum of them is 10 or more, and the alkyl group and the aryl group may have a substituent] (2) In the formula (2), R ^4a and R ^5a each independently represent an alkyl group or an aryl group, and the total number of carbon atoms of R ^4a and R ^5a is 10 or more, and the alkyl group and the aryl group may have a substituent] General formula (3) In the formula (3), R ^1d represents an alkyl group or an aryl group, and R ^2d and R ^3d each independently represent a hydrogen atom, an alkyl group or an aryl group, and the alkyl group and the aryl group may have a substituent]. The strip-shaped polarizing plate of claim 7, wherein the transparent film contains the compound which reduces optical anisotropy in a range satisfying the following formulas (iv) and (v), (iv) (Rth(A)-Rth(0))/A≦-1.0 (v) 0.01≦A≦30 wherein Rth(A): Rth of a film containing A% of a compound which reduces optical anisotropy (nm) Rth (0): Rth (nm) A of a film which does not contain a compound which reduces optical anisotropy: mass (%) of the compound when the mass of the film base polymer is 100. The strip-shaped polarizing plate of claim 1 or 2, wherein the transparent film contains a wavelength dispersion adjusting agent that scatters the wavelength of Rth _by ΔRth = |Rth _{(400) -} Rth ₍₇₀₀₎ . The long-length polarizing plate of claim 10, wherein the wavelength dispersion adjusting agent is a benzotriazole-based compound represented by the formula (101), and a diphenylketone-based compound represented by the formula (102). Or a compound containing a cyano group represented by the formula (103), a formula (101) Q ¹ -Q ² -OH (wherein Q ¹ represents a nitrogen-containing aromatic heterocyclic ring, and Q ² represents an aromatic ring) ) General formula (102) (wherein Q ¹ and Q ² each independently represent an aromatic ring, and X represents NR (R represents a hydrogen atom or a substituent), an oxygen atom or a sulfur atom) (103) (wherein Q ¹ and Q ² each independently represent an aromatic ring, and X ¹ and X ² represent a hydrogen atom or a substituent, and at least one of them represents a cyano group, a carbonyl group, a sulfonyl group, or an aromatic hetero ring. ). The strip-shaped polarizing plate of claim 10, wherein the transparent film contains at least one of the wavelength dispersion adjusting agents in a range satisfying the following formulas (vii) and (viii), (vii) (ΔRth(B)-ΔRth (0)) / B ≦ - 2.0 (viii) 0.01 ≦ B ≦ 30 wherein ΔRth (B): ΔRth (nm) ΔRth (0) of the film containing B% of the wavelength dispersion adjusting agent: no wavelength ΔRth (nm) B of the film of the dispersion adjusting agent: the weight (%) of the compound when the weight of the film base polymer was 100. A strip-shaped polarizing plate according to claim 1 or 2, which is used for a VA or IPS type liquid crystal display device. The long polarizing plate of claim 1 or 2, wherein the single plate penetration rate TT, parallel penetration rate PT, orthogonal wear of 400 to 700 nm at 25 ° C 60% RH The permeability CT and the degree of polarization P satisfy the following formulas (a) to (d), (a) 40.0 ≦ TT ≦ 45.0 (b) 30.0 ≦ PT ≦ 40.0 (c) CT ≦ 2.0 (d) 95.0 ≦ P. The elongated polarizing plate of claim 14, wherein when the orthogonal transmittance of the wavelength λ is T (λ), T ₍₃₈₀₎ , T ₍₄₁₀₎ , and T ₍₇₀₀₎ satisfy the following formula ( e)~(g), (e)T ₍₃₈₀₎ ≦2.0 (f)T ₍₄₁₀₎ ≦1.0 (g)T ₍₇₀₀₎ ≦0.5. The long polarizing plate of claim 14, wherein the amount of change in the orthogonal transmittance at 400 to 700 nm is ΔCT and the degree of change in polarization under the condition of standing at 500 ° C and 95% RH for 500 hours. ΔP system satisfies the following formula (h), (i), (h)-6.0≦ΔCT≦6.0 (i)-10.0≦ΔP≦0.0 (wherein the amount of change indicates that the test value is subtracted from the test value after the test) The value after the previous measurement). In the case of the long-length polarizing plate of claim 14, wherein the amount of change in the orthogonal transmittance at 400 to 700 nm is ΔCT and the degree of change in polarization under the condition of standing at 60 ° C and 90% RH for 500 hours. ΔP system satisfies the following formula (j), (k), (j) - 3.0 ≦ ΔCT ≦ 3.0 (k) - 5.0 ≦ ΔP ≦ 0.0. In the case of the long-length polarizing plate of claim 14, wherein the amount of change in the orthogonal transmittance at 400 to 700 nm is ΔCT and the amount of change in polarization degree ΔP in the case where it has been left to stand for 500 hours at 80 ° C The following formulas (1), (m), (l) - 3.0 ≦ ΔCT ≦ 3.0 (m) - 2.0 ≦ ΔP ≦ 0.0 are satisfied. A long strip-shaped polarizing plate characterized in that an optically anisotropic layer satisfying the following formula (iii) is provided on a transparent film of a polarizing plate of claim 1 or 2, and an optical compensation film integrated type is formed, (iii) ) Re ₍₆₃₀₎ = 0 to 200 (nm) and |Rth ₍₆₃₀₎ | = 0 to 400 (nm). The elongated polarizing plate of claim 19, wherein the optically anisotropic layer is formed using a discotic liquid crystalline compound. The elongated polarizing plate of claim 19, wherein the optically anisotropic layer is formed using a rod-like liquid crystalline compound. The elongated polarizing plate of claim 19, wherein the optically anisotropic layer comprises a polymer film having birefringence. The strip-shaped polarizing plate of claim 22, wherein the polymer film forming the optically anisotropic layer contains at least one member selected from the group consisting of polyamine, polyimine, polyester, polyether ketone, polyamine A polymeric material in the group of quinone imine polyester quinone imines and polyaryl ether ketones. The strip-shaped polarizing plate of claim 1 or 2, which is provided with at least one of a hard coat layer, an anti-glare layer and an anti-reflection layer on the surface. A polarizing plate for a liquid crystal display device, which is capable of cutting the long polarizing plate of any one of claims 1 to 24. The polarizing plate of claim 25 is used for an IPS type liquid crystal display device. A method for producing a long strip-shaped polarizing plate, characterized in that a strip-shaped polarizer is attached by roll to roll, and a cellulose-containing material is contained as a polymer material and is in a film surface. The hysteresis value Re and the hysteresis value Rth of the film thickness direction of the film satisfy the long transparent film of the formula (i) (ii) having a thickness of 20 to 200 μm, (i) 0≦Re ₍₆₃₀₎ ≦ 10 (ii)| Rth ₍₆₃₀₎ | ≦ 20 [wherein, Re _(λ) is the front hysteresis value (unit: nm) at the wavelength _λ nm, and Rth _(λ) is the hysteresis value (unit: nm) in the film thickness direction of the wavelength _λ nm] .