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Optically-compensatory sheet, polarizing plate and liquid crystal display device

An optical compensation sheet, optical anisotropy technology, applied in the field of optical compensation sheet

Inactive Publication Date: 2008-04-30
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the ring-opened polymer-based polyolefin film is not suitable for viewing angle improvement of TN liquid crystal display devices or OCB liquid crystal display devices.

Method used

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  • Optically-compensatory sheet, polarizing plate and liquid crystal display device
  • Optically-compensatory sheet, polarizing plate and liquid crystal display device
  • Optically-compensatory sheet, polarizing plate and liquid crystal display device

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0204] The above production method may further involve peeling off the cyclic olefin-based addition polymer from the cooling roll after the above-mentioned step of cooling the cyclic olefin-based addition polymer film thus cooled at a rate of 0.2 to 20° C. / sec A step of.

[0205] The cyclic olefin-based addition polymer film thus peeled off may be conveyed on a plurality of rollers arranged at intervals of 0.2-10 m, preferably 0.3-8 m, more preferably 0.4-6 m. By conveying the film over such a long span under cooling in this way, unevenness in conveying tension due to friction with the conveying roller can be suppressed. During cooling, the conveying tension is unbalanced due to unbalanced shrinkage from left to right. To moderate unbalanced conveying tensions, a roller gap wide enough to allow free movement and buffering of the film is required. When the gap between the conveying rollers is 0.2-10 m, the cyclic olefin-based addition polymer film experiences no friction with...

Embodiment 1

[0381] [Formation of basement membrane]

[0382] (Formation of Cyclic Olefin-Based Addition Polymer Base Film F-11)

[0383] APL5014 (Tg: 135° C.) (manufactured by Mitsui Chemicals Co., Ltd.) was melted in a single-screw extruder having an inner diameter of 50 mm and an L / D of 28 under preheating to 90° C. The temperature of the extruder was 200°C at its inlet side and 140°C at its outlet side. Then, the molten film material was extruded through a T-die by means of a sintered filter to a gear pump at the exit of the extruder.

[0384] Three cooling rolls are used in the cooling step. These cooling rolls were arranged at intervals of 3 cm. The temperature of the first chill roll closest to the die was 130°C. The value obtained by subtracting the temperature of the first cooling roll from the temperature of the second cooling roll was 3°C. The value obtained by subtracting the temperature of the third cooling roll from the temperature of the second cooling roll was 13°C.

...

Embodiment 2

[0426] (Surface treatment of base film based on cyclic olefin addition polymer)

[0427] Base films F-11, F-21, F-31, F-41, F-51, and F-61 based on cyclic olefin addition polymers were placed between upper and lower brass electrodes (in an argon atmosphere). atmosphere) received glow discharge treatment (applying a high-frequency voltage of 4,200V at a frequency of 3,000Hz through the upper and lower electrodes for 20 seconds) to prepare films F-12, F-22, F-32, F-42, F- 52 and F-62. The surface of the protective film thus subjected to the glow discharge treatment exhibited a contact angle from 36° to 41° with respect to pure water. For the measurement of the contact angle, a CA-X type contact angle meter (manufactured by Kyowa Interface Science Co., Ltd.) was used.

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Abstract

An optical compensation sheet small in an optical character change with respect to an environment temperature / humidity changes, and high in freedom of design of in-plane retardation Re and film-thickness-direction retardation Rth. A polarizing plate and a liquid crystal display unit having such an excellent optical compensation sheet. An optical compensation sheet characterized by laminating an optical anisotropic layer on a substrate film containing a cycloolefin addition polymer. An polarizing plate consisting of a polarizer and two protection films disposed on the opposite sides of it, characterized in that at least one of the protection films is the optical compensation sheet. A liquid crystal display unit characterized by using at least one polarizing plate.

Description

technical field [0001] The invention relates to an optical compensation sheet, a polarizing sheet and a liquid crystal display device. More specifically, the present invention relates to an optical compensation sheet comprising a cyclic olefin-based addition polymer as a base film. Background technique [0002] A polarizing plate is typically prepared by adhering a film mainly formed of cellulose triacetate as a protective film on both sides of a polarizing film formed of iodine or dichroic dye oriented and adsorbed onto polyvinyl alcohol. Cellulose triacetate has characteristics of being high in rigidity, flame retardancy, and optical isotropy (low retardation value), and is widely used for the above-mentioned polarizer protective film. A liquid crystal display device is formed of a polarizing plate and a liquid crystal element. Today, TN-mode TFT liquid crystal display devices, which are the mainstream of liquid crystal display devices, realize high display visibility by...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30C08F232/00C08J7/04G02F1/1335G02F1/13363C08L45/00
Inventor 大谷纯生大轻郁子
Owner FUJIFILM CORP
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