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Method for producing phase difference 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, flat products, instruments, etc., can solve the problems of reduced retardation value, achieve the effects of reduced performance changes, reduced changes in orientation state, and high contrast

Active Publication Date: 2015-01-07
KONICA MINOLTA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, after the retardation film is produced, the retardation value will decrease due to various environmental changes

Method used

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  • Method for producing phase difference film, polarizing plate, and liquid crystal display device
  • Method for producing phase difference film, polarizing plate, and liquid crystal display device
  • Method for producing phase difference film, polarizing plate, and liquid crystal display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0305]

[0306] 〔Mix preparation process〕

[0307]

[0308] Particles (manufactured by AEROSIL R812V Japan Aerosil Co., Ltd.) 11 parts by mass

[0309] 89 parts by mass of ethanol

[0310] The above substances were stirred and mixed with a dissolver for 50 minutes, and then dispersed with a Manton-Gaulin.

[0311]

[0312] The microparticle dispersion 1 was slowly added to a dissolution tank filled with dichloromethane while stirring well. Furthermore, dispersion is performed with an attritor so that the particle size of the secondary particles becomes a predetermined size. This was filtered through Finemet NF manufactured by Nippon Seisen Co., Ltd. to prepare fine particle addition solution 1.

[0313] Dichloromethane 99 parts by mass

[0314] Particle dispersion 15 parts by mass

[0315] A cement of the following composition was prepared. First add dichloromethane and ethanol to the pressurized dissolution tank. Add cellulose acetate to a pressurized dissolving ...

Embodiment 2

[0355]

[0356] In preparation of the retardation film 101, except having changed the dope into the following composition, the cellulose acetate film F was produced similarly.

[0357] (composition of mucilage)

[0358]

[0359] (Formation of hard coat layer)

[0360] The following hard coat coating composition was filtered through a polypropylene filter with a pore size of 0.4 μm to prepare a hard coat coating solution, which was coated on the cellulose acetate membrane F prepared above using a micro gravure coater, After drying at 80°C, use a UV lamp so that the illuminance of the irradiated part is 80mW / cm 2 , the irradiation dose is 80mJ / cm 2 , the coating layer was cured to form a hard coat layer 1 with a dry film thickness of 9 μm, and wound up to produce a roll-shaped hard coat film 1 .

[0361] (Hard coat coating composition)

[0362] The following materials were stirred and mixed to form a hard coat coating composition.

[0363]

[0364]

[0365]

[...

Embodiment 3

[0400]

[0401] The polarizing plate of the liquid crystal panel of the 40-type display KDL-40V5 manufactured by SONY was peeled off, and the above-prepared polarizing plate 201, which was the polarizing plate on the visible side, was bonded to the adhesive layer and the liquid crystal cell so that the hard coat layer was on the visible side. The visible side glass of the car is connected and bonded. In addition, on the backlight side, the polarizing plate 223 is bonded together with an adhesive and a liquid crystal cell glass to manufacture the liquid crystal panel 301 . Next, the liquid crystal panel 301 is mounted on a liquid crystal television to fabricate a liquid crystal display device 401 .

[0402]

[0403] In the production of the liquid crystal display device 401, as shown in Table 5, except that the viewing side polarizing plate 201 was changed to 202 to 222, and the backlight side polarizing plate 223 was changed to 224 to 244, the liquid crystal display was pr...

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Abstract

The problem to be solved by the present invention is to provide: a method for producing a phase difference film having an excellent phase difference development property and good moisture resistance; a polarizing plate equipped with the phase difference film; and a liquid crystal display device which is equipped with the phase difference film, has a reduced color shift, and has high contrast. The method for producing a phase difference film according to the present invention is a method for producing a phase difference film that contains cellulose acetate having an average acetyl group substitution degree of 2.0 to 2.5 and has a water content of 1.0 mass% or less, said method being characterized in that the phase difference film contains a compound having a van der Waals volume of 450 to 1000 Ǻ3 and the phase difference film is produced through at least five specific steps.

Description

technical field [0001] The present invention relates to a method for producing a retardation film, and a polarizing plate and a liquid crystal display device provided with the retardation film produced by the production method. Background technique [0002] Currently, in liquid crystal display devices such as televisions and computer monitors, in order to improve the angular dependence of hue and front contrast, retardation films and combinations thereof having specific retardation values ​​(hereinafter also referred to as R values) are used. [0003] It is known that retardation films are produced from synthetic polymers, cellulose esters, and the like. Among them, a film made of cellulose ester has the advantage that it can be directly bonded to a polarizer mainly composed of polyvinyl alcohol by saponifying and hydrophilizing the surface by immersing the surface in an aqueous alkali solution. Therefore, a film made of cellulose ester is widely used as a film with a retar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30B29C41/28B29C55/02C08J5/18G02F1/1335G02F1/13363B29K1/00B29L7/00B29L11/00
CPCB29K2995/0034C08J5/18C08J7/04C08J2301/12B29C55/02B29C55/08G02B5/3083B29D11/00644B29C41/28B29C55/12B29K2001/08B29D11/00788C08K5/13C08K5/132C08K5/3492C08K5/45G02F1/13363B29K2001/12G02B5/3033
Inventor 高木隆裕
Owner KONICA MINOLTA INC
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