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Cellulose acylate film, polarizing plate and liquid crystal display

A technology of cellulose acylate and polarizer, applied in polarizing components, instruments, thin material processing, etc., can solve problems such as difficult to achieve retardation value, optical compensation function changes, etc.

Active Publication Date: 2007-04-11
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in recent years, much higher retardation values ​​are required, and therefore, it is necessary to increase the amount of the retardation generating agent or increase the draw ratio
However, it is difficult to achieve the desired retardation value due to exudation of additives or breakage upon stretching
Also, liquid crystal displays come into use under various conditions in many cases, and the cellulose ester film obtained by the above technique involves a problem that its optical compensation function changes under these conditions

Method used

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  • Cellulose acylate film, polarizing plate and liquid crystal display
  • Cellulose acylate film, polarizing plate and liquid crystal display
  • Cellulose acylate film, polarizing plate and liquid crystal display

Examples

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preparation example Construction

[0107] Various additives such as plasticizers, UV preventers (UV absorbers), deterioration preventers, retardation (optical anisotropy) control agents, fine particles, peeling Accelerator and infrared absorber) are added to the cellulose acylate solution of the present invention. These additives can be in solid or oily state. That is, there is no particular limitation on their melting point or boiling point. For example, an ultraviolet absorber having a melting point of 20°C or lower may be mixed with an ultraviolet absorber having a melting point of 20°C or higher, and a plasticizer may be mixed in a similar manner. These contents are described in JP-A-2001-151901, for example. Ethyl citrate is mentioned as a delamination accelerator. In addition, examples of infrared absorbers are described in, for example, JP-A-2001-194522. As for the stage of adding these additives, they may be added in any stage of the dope preparation step. It is also possible to additionally provid...

Embodiment 1

[0447] 1. Preparation of Cellulose Acylate Film

[0448] (1) Cellulose acylate

[0449] Cellulose acylates having different degrees of substitution with acyl groups described in Table 1 were prepared. The acylation reaction was carried out at 40° C. by adding sulfuric acid (7.8 parts by weight / 100 parts by weight of cellulose) and by adding carboxylic acid. Subsequently, the total degree of substitution and the degree of substitution at the 6-position were adjusted by adjusting the amount of sulfuric acid catalyst, the amount of water, and the aging time. Ripening was performed at 40°C. In addition, low molecular weight components of cellulose acylate were removed by washing with acetone.

[0450] (2) Preparation of dope

[0451] At a solid content of 19% by weight, cellulose acylate, a plasticizer (a 2:1 mixture of triphenyl phosphate and biphenyl diphenyl phosphate) described in Table 1, and a retardation generating agent of the following structure were charged into a m...

Embodiment 2

[0465]

[0466] (Preparation of Polarizer-1)

[0467] Polarizers were prepared by adsorbing iodine onto stretched polyvinyl alcohol films.

[0468] Each of the cellulose acylate films (F1-F17; corresponding to TAC1 in FIGS. 1 and 2, TAC1-1 or TAC1-2 in FIG. 3) prepared in Example 1 was laminated using a polyethylene-based adhesive. placed on one side of the polarizer. In addition, saponification treatment was performed under the following conditions.

[0469] Prepare 1. SN sodium hydroxide aqueous solution and keep it at 55°C. Prepare a 0.01N dilute sulfuric acid aqueous solution and keep it at 35°C. Each of the prepared cellulose acylate films was immersed in an aqueous sodium hydroxide solution for 2 minutes, and then immersed in water to sufficiently wash off the aqueous sodium hydroxide solution. Subsequently, the film was immersed in a dilute sulfuric acid aqueous solution for 1 minute, and then immersed in water to sufficiently wash away the dilute sulfuric acid aq...

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Abstract

The invention provides a cellulose acylate film which exhibits excellent retardation values both in the film plane and along the direction perpendicular to the film plane, and undergoes less change in the retardation values by environmental humidity, and a polarizing plate using this film, a polarizing plate using the film, and a liquid crystal display undergoing less change in viewing angle characteristics, the cellulose acylate film satisfies formulae (I), (II), (V) and (VI), wherein Re(630) and Rth(630) is defined in the specification: (I) 2.00 <= DS2 + DS3 + DS6 <= 3.00. (II) DS6 / (DS2 + DS3 + DS6) >= 0.315. (V) 46 <= Re(630) <= 200 (VI). 70 <= Rth(630) <= 350.

Description

technical field [0001] The present invention relates to a cellulose acylate film, a polarizing plate and a liquid crystal display using the film. Background technique [0002] Liquid crystal displays are widely used in personal computers, monitors of mobile devices, and televisions due to many advantages such as they can be driven at low voltage and low consumed electric power and they allow thickness reduction. As for the mode of such a liquid crystal display, many modes in which the arrangement state of liquid crystals in a liquid crystal cell differs have been proposed. Hitherto, the TN mode in which liquid crystal molecules are aligned in an approximately 90-degree twisted state from the lower substrate of the liquid crystal cell to its upper substrate has been the main mode. [0003] Generally, a liquid crystal display is composed of a liquid crystal element, an optical compensation sheet, and a polarizer. The optical compensation sheet is used to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18G02B5/30G02F1/1335G02F1/13363C08L1/10
CPCC08J2301/12G02F1/13363G02B5/305Y10T428/1041C08J5/18G02F1/133528C08K5/3492C09K2323/031G02B5/30C08L1/10
Inventor 大谷纯生川西弘之西浦阳介
Owner FUJIFILM CORP
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