Retardation film, method for producing retardation film, polarizing plate, and liquid crystal display device

A technology of retardation film and manufacturing method, which is applied in the direction of polarizing elements, chemical instruments and methods, instruments, etc., can solve the problems such as the limitation of the amount of addition, and achieve the effect of high contrast and excellent roll stability

Active Publication Date: 2014-09-10
KONICA MINOLTA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as with the technology disclosed in Patent Document 1, for the qualities required for cellulose ester films, such as transparency and contrast, merely increasing the amount of the matting agent is the main reason for deteriorating the qualities, such as transparency, and the like. The amount of addition is naturally limited

Method used

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  • Retardation film, method for producing retardation film, polarizing plate, and liquid crystal display device
  • Retardation film, method for producing retardation film, polarizing plate, and liquid crystal display device
  • Retardation film, method for producing retardation film, polarizing plate, and liquid crystal display device

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Experimental program
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Embodiment approach

[0143] As mentioned above, the definition and preferred embodiment of the r value of the present invention have been described, but as a preferred embodiment based on other viewpoints of the retardation film of the present invention, it can be mentioned that the Tg reducing agent has a concentration gradient along the thickness direction of the film. Such implementations exist. For example, as the simplest example, the following embodiment can be preferably mentioned: when the phase difference film of the present invention is cut into two equal parts on a plane perpendicular to its thickness direction (a plane parallel to the plane direction of the film), there is The amount of the Tg lowering agent present in the segment including the bonding surface with the polarizer is larger than the amount of the Tg lowering agent present in the other segment (the segment including the other surface). If this is generalized, an embodiment in which the cellulose acylate film of the presen...

Embodiment 1

[0420] "Manufacturing of Retardation Film"

[0421] [Production of Retardation Film 101]

[0422] (Preparation of microparticle additive solution)

[0423]

[0424] Particles (Aerosil R812 manufactured by Aerosil Japan Co., Ltd.) 11 parts by mass

[0425] 89 parts by mass of ethanol

[0426] The above components were stirred and mixed with a dissolver for 50 minutes, and then dispersed with a homogenizer (Manton-Gaulin) to prepare a fine particle dispersion 1.

[0427]

[0428] The above fine particle dispersion 1 was slowly added while fully stirring in a dissolving tank filled with methylene chloride. The qualities of dichloromethane and microparticle dispersion are as follows. Furthermore, dispersion is carried out with an attritor so that the particle size of the secondary particles becomes a predetermined size. This was filtered through Fine Met NF manufactured by Nippon Seisen Co., Ltd. to prepare a microparticle-added liquid 1.

[0429] Dichloromethane 99 part...

Embodiment 2

[0521] "Making of Polarizers"

[0522] A polyvinyl alcohol film having a thickness of 120 μm was uniaxially stretched (at a temperature of 110° C. and a stretching ratio of 5 times). Immerse it in an aqueous solution consisting of 0.075 g of iodine, 5 g of potassium iodide, and 100 g of water for 60 seconds, then dip it in an aqueous solution of 68°C consisting of 6 g of potassium iodide, 7.5 g of boric acid, and 100 g of water, then wash it with water, and dry it , to obtain a polarizer.

[0523] Next, the polarizer and the retardation films 101 to 125 produced in Example 1 were bonded according to the following steps 1 to 5, and Konica Minolta TAC KC4UY (cellulose ester film manufactured by Konica Minolta Opto Co., Ltd.) was bonded on the back side. , making polarizers 101-125.

[0524] Step 1: Each retardation film and Konica Minolta KC4UY were immersed in a 60° C. 2 mol / L sodium hydroxide solution for 90 seconds, then washed with water and dried to saponify the polarizer...

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Abstract

The present invention addresses the problem of providing: a retardation film which has high contrast and exhibits excellent wound state stability during the production of a long laminated roll; a method for producing the retardation film; and a polarizing plate and a liquid crystal display device, each of which is provided with the retardation film. A retardation film of the present invention contains a cellulose acylate that has a degree of substitution of acetyl groups within the range of 2.0-2.5, and is characterized in that if one surface of the retardation film is referred to as surface A and the other surface of the retardation film is referred to as surface B, the Martens hardness of surface A and the Martens hardness of surface B are both within the range of 190-210 N/mm2, and the arithmetic mean roughness (Ra) of surface A and the arithmetic mean roughness (Ra) of the surface B are both within the range of 0.5-2.0 nm.

Description

technical field [0001] The present invention relates to a retardation film excellent in productivity and production stability, a method for producing the retardation film, a polarizing plate and a liquid crystal display device including the retardation film. Background technique [0002] Nowadays, liquid crystal display devices (hereinafter, also referred to as LCDs) are in increasing demand due to the spread of liquid crystal displays mounted on automobiles, displays of large liquid crystal televisions, mobile phones, notebook computers, and the like. Various optical films such as polarizing films and retardation films are used in such LCDs. [0003] A cellulose acylate film can be used widely as a retardation film for polarizing plates of a liquid crystal display device (LCD). As a conventional method for producing a cellulose acylate film, for example, in the case of using a solution casting film-forming method, a cellulose ester solution (hereinafter, also referred to a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30C08J5/18G02F1/1335G02F1/13363
CPCG02B5/3083C08J2301/12B32B27/08C08J3/2053C08J5/18
Inventor 佐藤英幸
Owner KONICA MINOLTA INC
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