Cellulose acylate film, phase-difference film, polarizing plate, and liquid-crystal display device

A technology of cellulose acylate and acylate film, which is applied in the direction of polarizing elements, instruments, optical elements, etc., can solve the problems of film performance changes, achieve low water content, prevent polarizer deterioration, and exhibit good optical properties. Effect

Active Publication Date: 2012-07-25
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] On the other hand, cellulose acylate films tend to absorb water more than any other synthetic polymer films, so there is a problem in that film properties often change with changes in ambient humidity

Method used

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  • Cellulose acylate film, phase-difference film, polarizing plate, and liquid-crystal display device
  • Cellulose acylate film, phase-difference film, polarizing plate, and liquid-crystal display device
  • Cellulose acylate film, phase-difference film, polarizing plate, and liquid-crystal display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1~8

[0319] [Examples 1 to 8, Comparative Examples 2 to 13]

[0320] [Production of cellulose acylate film]

[0321] The cellulose acylate films of Examples 1 to 8 and Comparative Examples 2 to 13 were produced in the same manner as Comparative Example 1, except for the degree of substitution of cellulose acetate, the type and amount of carbohydrate derivatives, and The stretching temperature, the stretching ratio during stretching, and the film thickness were changed in Table 5 below.

[0322] In Table 5 below, the amount of carbohydrate derivatives is based on parts by mass relative to 100 parts by mass of cellulose acylate resin.

[0323] [Saponification treatment of cellulose acylate film and manufacture of polarizing plate]

[0324] In the same manner as in Comparative Example 1, the cellulose acylate films of Examples 1 to 8 and Comparative Examples 2 to 13 were respectively subjected to saponification treatment and used in the manufacture of polarizing plates, thereby making the pola...

Embodiment 9~12

[0366] [Production of cellulose acylate film]

[0367] The cellulose acylate films of Examples 9 to 12 were produced in the same manner as Comparative Example 14, except that the type and amount of carbohydrate derivatives in Comparative Example 14 were changed in Table 6 below. In Table 6 below, the amount of carbohydrate derivatives is based on the ratio (mass %) relative to cellulose acylate.

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Abstract

Provided is a cellulose acylate film that contains a cellulose acylate and a carbohydrate derivative in which a hydroxyl group is substituted with at least two species of substituent, at least one of which has at least one aromatic ring. Said carbohydrate derivative has a C log P between 0.5 and 5 and a maximum molar absorptivity for wavelengths between 230 nm and 700 nm of at most 50*103. The provided cellulose acylate film is characterized by containing 1 to 30 parts by mass of the aforementioned carbohydrate derivative per 100 parts by mass of the cellulose acylate. The cellulose acylate film has low moisture content, expresses optical properties well, has low haze, and when attached to a polarizing plate, reduces the degradation of polarizers that occurs over time in high-temperature high-humidity environments.

Description

Technical field [0001] The present invention relates to a cellulose acylate film, a retardation film, and a polarizing plate and liquid crystal display device using the cellulose acylate film. Background technique [0002] The use of liquid crystal display devices as energy-saving and space-saving image display devices is expanding year by year. In the past, a serious defect of liquid crystal display devices was that the viewing angle of the displayed image of the device was very dependent. However, in recent years, wide viewing angle liquid crystal display modes such as the VA-mode have been put into practical use, and therefore, even in the market for televisions and the like requiring high-quality images, the demand for liquid crystal display devices is rapidly expanding. [0003] The basic structure of a liquid crystal display device includes a liquid crystal cell and polarizing plates arranged on both sides of the liquid crystal cell. The role of the polarizer is to transmit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L1/10C08J5/18C08K5/1545G02B5/30G02F1/1335G02F1/13363
CPCC08J5/18C08K5/151C08L1/14G02B5/3033G02B5/3083C08J2301/10C08L1/10
Inventor 深川伸隆大野贵广西川尚之镰田利洋
Owner FUJIFILM CORP
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