Method for producing cellulose acylate film, polarizing plate and liquid crystal display
A technology of cellulose acylate and liquid crystal display, applied in polarizing elements, instruments, optics, etc., can solve the problem that the generation of color shift has not been improved
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[0055] According to an exemplary embodiment of the present invention, such an optical characteristic is given to the cellulose acylate film, wherein, when the incident light is in the normal direction and when the incident light is in the oblique direction inclined to the normal direction, for example When the polar angle is 60°, the wavelength dispersion of the retardation is different, and this optical characteristic is actively used for optical compensation. The scope of the present invention is not limited to the display mode of the liquid crystal layer (i.e., liquid crystal element), and the present invention can be applied to a liquid crystal display having a liquid crystal layer of any display mode, such as VA mode, IPS mode, ECB mode, TN mode, and OCB mode and more.
[0056] Hereinafter, exemplary specific embodiments of the present invention will be described.
[0057] (preparation method of the present invention)
[0058] As a result of painstaking studies, the inv...
Embodiment 1-4
[0523] (embodiment 1-4, comparative example 1-2, and embodiment 1'-4')
[0524] Preparation of Cellulose Acylate Film
[0525] (1) Cellulose acylate
[0526] Sulfur is added to the cellulose as a catalyst, and carboxylic acid anhydride is added as a source of acyl functional groups to initiate the acylation reaction. Then, it is neutralized and aging can be performed. Here, the type of acyl group, degree of substitution, high specific gravity, polymerization Various cellulose acylates with different degrees. In addition, low molecular weight cellulose acylate was removed with acetone.
[0527] Using the cellulose acylate prepared above, and the cellulose acylate having an acetyl substitution degree of 2.79 and DS6 / (DS2+D3+DS6)=0.322, the following dope was prepared.
[0528] (2) Dope preparation
[0529] Cellulose acylate solution
[0530] The following composition was put into a mixing tank, stirred to dissolve, then heated at 90° C. for about 10 min and filtered with...
Embodiment 9-14、 comparative example 3、 Embodiment 5
[0590] (embodiment 9-14, comparative example 3, embodiment 5'-6')
[0591]
[0592] Attaching polarizing plates using the cellulose acylate films prepared in Examples 3-8, Comparative Example 1, and Examples 1'-2' to the upper polarizing plate (observer side) of a liquid crystal display using a homeotropic alignment liquid crystal cell And on the lower polarizing plate (backlight side), so that the cellulose acylate film is on the liquid crystal side. They were arranged crosswise so that the transmission axis of the upper polarizing plate was oriented in the up-down direction and the lower polarizing plate was oriented in the left-right direction.
[0593] A 55 Hz pulse voltage was applied to this liquid crystal element. Black mode is typically used where white is displayed at 5V and black is displayed at 0V. Measure the black display transmittance (%) of the black display with a viewing angle of 45° azimuth and 60° polar, and the color between 45° azimuth and 60° polar, a...
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