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Method for producing polarizing film

A manufacturing method and technology of polarizing film, which are applied in the directions of optics, polarizing elements, optical elements, etc., can solve the problem of insufficient polarizing performance of polarizing film, and achieve the effect of high polarizing performance.

Active Publication Date: 2011-11-23
KURARAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, the degree of polymerization of PVA used in the above invention is preferably in the range of 3500 to 5000. As shown in the following comparative examples, even if this production method is directly applied to PVA with a high degree of polymerization, it is found that the polarizing performance of the obtained polarizing film is not good. full

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  • Method for producing polarizing film

Examples

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Effect test

Embodiment 1

[0074] A 5.5% by mass PVA aqueous solution containing 100 parts by mass of PVA with a degree of polymerization of 5800 and a degree of saponification of 99.8 mol% and 12 parts by mass of glycerin as a plasticizer was cast on a metal roll at 60°C and dried for 60 minutes. A PVA film with a thickness of 40 μm was obtained. This film was fixed to a metal frame, and it heat-processed at 120 degreeC for 3 minutes. The degree of swelling A of the film material after heat treatment was measured by the method described in (2) above, and it was 230%.

[0075] Next, cut the above-mentioned film blank into a size of 11 cm in the flow direction × 10 cm in the width direction, take the flow direction as the stretching direction, install it on a stretching jig with a chuck distance of 4 cm, and immerse it in pure water at 30 ° C. After 1 minute, it was immersed in a dyeing solution (temperature 30° C.) containing 0.03 mass % iodine and 3 mass % potassium iodide, and stretched to 2.6 times ...

Embodiment 2

[0078] A 5.5% by mass PVA aqueous solution containing 100 parts by mass of PVA with a degree of polymerization of 5800 and a degree of saponification of 99.8 mol% and 12 parts by mass of glycerin as a plasticizer was cast on a metal roll at 60°C and dried for 60 minutes. A PVA film with a thickness of 40 μm was obtained. This film was fixed to a metal frame, and heat-processed at 115 degreeC for 3 minutes. The swelling degree A of the film material after heat treatment was measured by the method described in (2) above, and it was 240%.

[0079] Next, in the same manner as in Example 1, iodine was adsorbed while stretching the above-mentioned film raw material. The degree of swelling B of the obtained stretched film was measured by the method described in the above (3), and it was 260%.

[0080] Next, in the same manner as in Example 1, a polarizing film was obtained. The transmittance and polarization degree of the polarizing film were measured by the methods described in (...

Embodiment 3

[0082] A 5.5% by mass PVA aqueous solution containing 100 parts by mass of PVA with a degree of polymerization of 9100 and a degree of saponification of 99.8 mol% and 12 parts by mass of glycerin as a plasticizer was cast on a metal roll at 60°C and dried for 60 minutes. A PVA film with a thickness of 20 μm was obtained. This film was fixed to a metal frame, and it heat-processed at 110 degreeC for 3 minutes. The degree of swelling A of the film material after heat treatment was measured by the method described in (2) above, and it was 230%.

[0083] Next, iodine was adsorb|sucked, stretching the said film raw material similarly to Example 1 except having made stretching ratio into 2.5 times. The degree of swelling B of the obtained stretched film was measured by the method described in the above (3), and it was 255%.

[0084] Next, in the same manner as in Example 1, a polarizing film was obtained. The transmittance and polarization degree of the polarizing film were measu...

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Abstract

Disclosed is a method for producing a polarizing film, wherein a film composed of a polyvinyl alcohol having a high polymerization degree can be processed into a polarizing film having high polarization performance. The method for producing a polarizing film comprises a step wherein a material film, which has a swelling degree of A (%) and is formed from a polyvinyl alcohol having a polymerization degree of not less than 5,000, is wet stretched 2.0-2.9 times, thereby obtaining a stretched film having a swelling degree of B (%). In this connection, the values A and B satisfy a specific relation. The method for producing a polarizing film preferably comprises, after the wet stretching step, a step wherein the thus-obtained stretched film is further stretched three or less times in an aqueous boric acid solution.

Description

technical field [0001] The present invention relates to a method for producing a polarizing film that can be used as a member of a polarizing plate constituting a liquid crystal display device. Background technique [0002] Liquid crystal display (LCD) was used in small devices such as desktop computers and watches in the early stages of its development, but in recent years, it has begun to be used in notebook computers, liquid crystal monitors, liquid crystal color projectors, liquid crystal TVs, and automotive A wide range of navigation systems, mobile phones, measuring instruments that can be used indoors and outdoors, etc. On the other hand, especially in applications such as liquid crystal televisions, improvement of display quality, such as improvement of contrast, is increasingly required, and improvement of polarizing performance is strongly required even for polarizing plates, which are one of LCD components. [0003] Polarizing plates commonly used at present have...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30B29C55/02C08J5/18G02F1/1335
CPCC08J5/18B29K2995/0034B29C55/065B29K2029/04G02B5/3033C08J2329/04
Inventor 中居寿夫矶﨑孝德
Owner KURARAY CO LTD
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