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Optical film, optical compensation sheet, polarizing plate and liquid crystal display device

An optical thin film and thin film technology, applied in optics, polarizing elements, nonlinear optics, etc., can solve problems such as difficult to obtain optical properties, difficult to increase orientation ratio, and difficult to obtain orientation ratio stably

Inactive Publication Date: 2009-03-18
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above method has a problem in that, if a high retardation value is intended to be obtained, the variation of the retardation and the slow axis increases within the surface of the film, so it is necessary to improve this problem
[0015] Cellulose triacetate is a raw material that is difficult to orient, so it is generally difficult to increase the orientation ratio
It is practically difficult to achieve this orientation ratio stably in the case of cellulose triacetate film resistance to orientation
[0019] And, regarding the addition amount, it is difficult to obtain the desired optical performance by increasing the addition amount as much as possible

Method used

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  • Optical film, optical compensation sheet, polarizing plate and liquid crystal display device
  • Optical film, optical compensation sheet, polarizing plate and liquid crystal display device
  • Optical film, optical compensation sheet, polarizing plate and liquid crystal display device

Examples

Experimental program
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example

[0397] Examples include 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, 2-(2'-hydroxy-3',5'-di-tert-butylphenyl)benzotriazole, 2-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)benzotriazole, 2-(2'-hydroxy-3',5'-di-tert-butylphenyl) -5-Chlorobenzotriazole, 2-(2'-Hydroxy-3'-(3", 4", 5", 6"-tetrahydrophthalimidomethyl)-5'-methane phenyl) benzotriazole, 2,2-methylene-bis(4-(1,1,3,3-tetramethylbutyl)-6-(2H-benzotriazol-2-yl ) phenol), 2-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole, 2,4-dihydroxybenzophenone, 2,2 '-Dihydroxy-4-methoxybenzophenone, 2-hydroxy-4-methoxy-5-sulfobenzophenone, bis(2-methoxy-4-hydroxy-5-benzophenone Acyltoluene), (2,4-bis-(n-octylthio)-6-(4-hydroxy-3,5-di-tert-butylanilino)-1,3,5-triazine, 2(2 '-Hydroxy-3',5'-di-tert-butylphenyl)-5-chlorobenzotriazole, (2(2'-hydroxy-3',5'-di-tert-amylphenyl)- 5-Chlorobenzotriazole, 2,6-di-tert-butyl-p-cresol, pentaerythritol-tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate ], triethylene glycol-bis...

Embodiment 1-1

[0783] (Preparation of Cellulose Acylate Film A1)

[0784] The following components of the cellulose acetate solution composition were poured into a mixing tank and the resultant was stirred under heating, thereby dissolving these components into each other. Thus, a cellulose acetate solution was prepared.

[0785] (Composition of cellulose acetate solution)

[0786]Cellulose acetate (degree of acetylation: 60.9%) 100 parts by mass

[0787] Triphenyl phosphate (plasticizer) 7.8 parts by mass

[0788] 3.9 parts by mass of biphenyl diphenyl phosphate (plasticizer)

[0789] Dichloromethane (first solvent) 318 parts by mass

[0790] Methanol (the second solvent) 47 parts by mass

[0791] Silica (particle size: 0.2 μm) 0.1 parts by mass

[0792] Another mixing tank was equipped with 10 parts by mass of retardation control agent A shown below, 10 parts by mass of retardation control agent B shown below, 87 parts by mass of dichloromethane and 13 parts by mass of methanol, and ...

Embodiment 1-2

[0800] (Preparation of Cellulose Acylate Film A2)

[0801] A cellulose acetate film (thickness: 90 μm, width: 1,450 mm) was prepared in the same manner as in Example 1-1 except that the orientation ratio was changed to 30%. Using KOBRA 21ADH (trade name, manufactured by Oji Scientific Instruments), the Re retardation value and Rth retardation value at a wavelength of 590 nm of the prepared cellulose acetate film were measured. Furthermore, the wavelength dispersion shape, moisture dependence of optical properties at 25° C., moisture permeability, and dimensional change ratio were measured. The results are shown in Table 1.

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Abstract

An optical film, which contains a cellulose acylate, at least one compound of formula (I) in an amount of 0.01 to 20 mass parts, and at least one cyclic compound having at least three substituents in an amount of 0.01 to 20 mass parts, to 100 mass parts of the cellulose acylate: Formula (I) wherein R<1> to R<7>, R<9> and R<10> each independently is a hydrogen atom or a substituent; at least one of R<1> to R<5> is an electron-donating group; R<8> is a hydrogen atom, an alkyl group, an alkenyl group, an alkinyl group, an aryl group, an alkoxy group, an aryloxy group, an alkoxycarbonyl group, an acylamino group, an alkylcarbonyloxy group, a cyano group, or a halogen atom; and an optical compensation sheet, a polarizing plate, and a liquid crystal display device, each of which uses the optical film.

Description

technical field [0001] The present invention relates to an optical film, an optical compensation sheet, a polarizing plate, and a liquid crystal display device; in particular, to an optical compensation sheet made of only a cellulose acylate film, and using the optical compensation sheet. Compensation sheets for polarizers and liquid crystal display devices. Background technique [0002] Cellulose acylate films have moderate moisture permeability and are easy to process. Among cellulose films, cellulose acylate films have higher optical isotropy (lower retardation value) than other polymer films. Therefore, cellulose acylate films are generally used in applications requiring optical isotropy, such as polarizing plates. On the other hand, an optical compensation sheet (retardation film (or phase contrast film or phase difference film)), for example used in a liquid crystal display device, is required to conversely have optical anisotropy (high retardation value). Therefore...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/30C08K5/105C08K5/3492C08L1/10G02F1/13G02F1/1335G02F1/13363
Inventor 大轻郁子深川伸隆柳辉一川本博之
Owner FUJIFILM CORP