Cellulose acylate film, phase difference film, optical compensation film, polaroid and image display device

A cellulose acylate, film technology, applied in optics, optical elements, polarizing elements, etc., can solve the problem of not being able to obtain optical compensation optical properties and optical properties, and achieve the effect of small absolute value and large absolute value.

Active Publication Date: 2009-03-25
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these films cannot obtain optical properties that can contribute to optical compensation of IPS liquid crystal display devices, etc., and optical performance such that the absolute value of Re is large and the absolute value of Rth is small, about 0.

Method used

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  • Cellulose acylate film, phase difference film, optical compensation film, polaroid and image display device
  • Cellulose acylate film, phase difference film, optical compensation film, polaroid and image display device

Examples

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Embodiment

[0157]The following examples are given to further describe the present invention in detail. Materials, reagents, amounts of substances, ratios thereof, operations, and the like shown in the following examples can be appropriately changed without departing from the gist of the present invention. Therefore, the scope of the present invention is not limited by the following specific examples.

Synthetic example 1

[0158] (Synthesis Example 1: Synthesis of Exemplary Compound A-1)

[0159] Measure 200 g of acetylcellulose with a degree of substitution of 2.15, 2 L of acetone, and 132 mL of pyridine in a 5 L three-necked flask equipped with a mechanical stirrer, a thermometer, a cooling tube, and a dropping funnel, and stir at room temperature. 190 mL of benzoyl chloride was slowly added dropwise thereto, followed by further stirring at 60° C. for 5 hours after the dropwise addition. After the reaction, it was left to cool until it returned to room temperature, and the reaction solution was poured into 10 L of methanol while vigorously stirring, and a white solid was precipitated. The white solid was filtered off by suction and washed 3 times with plenty of methanol. The obtained white solid was dried at 60° C. overnight, and then vacuum-dried at 90° C. for 6 hours to obtain 230 g of the target exemplary compound A-1 as a white powder. The average degree of polymerization was 270.

Synthetic example 2

[0160] (Synthesis Example 2: Synthesis of Exemplary Compound A-2)

[0161] In the previous production of Exemplary Compound A-1, except that 132 mL of pyridine was changed to 146 mL and 190 mL of benzoyl chloride was changed to 210 mL, 250 g of the target Exemplified Compound A-2 was obtained as a white powder in the same manner. The average degree of polymerization was 275.

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Abstract

A novel cellulose acylate film is disclosed, which has large absolute value of Re and small absolute value of Rth. The cellulose acylate film is characterized by comprising at least at least one cellulose acylate having an aromatic group-containing acyl group (Substituent A), in which a substitution degree of the substituent A satisfies following relational expressions (I) and (II): -0.25 <= DSA2 + DSA3 - DSA6 <= 0.20 (I), 0.35 <= DSA2 + DSA3 + DSA6 (II), wherein DSA2, DSA3 and DSA6 each indicate a substitution degree with Substituent A at the 2-, 3- and 6-bit of the cellulose acylate.

Description

technical field [0001] The present invention relates to a cellulose acylate film, a retardation film, an optical compensation film, and a polarizing plate useful as various members of an image display device, and an image display device using the same. Background technique [0002] In recent years, with the popularization of liquid crystal display devices, the requirements for display performance and durability have become higher, and the response speed has been improved, and the contrast and color balance of the displayed image when viewed from an oblique direction have wider viewing angles. Compensation within the scope has become a topic. In order to solve these problems, various liquid crystal modes have been developed, and with the aim of compensating the viewing angle in accordance with each mode, it is urgent to develop retardation films as optical compensation films. [0003] For example, in the so-called in-plane switching (IPS) mode in which a transverse electric ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L1/10C08J5/18G02B5/30G02F1/1335G02B1/11
CPCG02B1/11C08J5/18C08J2301/12C08L1/10C08L1/12G02B5/3033C08J2301/10C08L1/08G02C7/12
Inventor 桑原知子渥美匡广
Owner FUJIFILM CORP
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