Polarized film, and method for manufacturing polarizer

A manufacturing method and polarizing film technology, applied to polarizing elements, chemical instruments and methods, and flat products, can solve problems such as film breakage, poor water removal, and poor appearance of polarizing films, and achieve fewer defects, excellent production efficiency, and high quality. Good results

Active Publication Date: 2015-08-05
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If you want to use a thin raw roll film to perform dyeing treatment, stretching treatment, crosslinking treatment, and washing treatment to obtain a thin polarizing film in a water-wet state, and blow air to the thin polarizing film with an air knife to remove water. , there is a problem that the film is broken, or the appearance of the polarizing film is poor due to poor water removal or foreign matter remaining on the film surface.

Method used

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  • Polarized film, and method for manufacturing polarizer
  • Polarized film, and method for manufacturing polarizer
  • Polarized film, and method for manufacturing polarizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0132] A polyvinyl alcohol film with a thickness of 60 μm (trade name "kuraray Vinylon VF-PE#6000" manufactured by Kuraray Co., Ltd., a degree of polymerization of 2400, and a degree of saponification of 99.9 mol% or more) was kept in a tense state in a 30- ℃ pure water in a swelling tank for 100 seconds to fully swell the membrane. Then, after dipping in a 30° C. dyeing tank with iodine / potassium iodide / water in a weight ratio of 0.02 / 1.5 / 100 for 90 seconds and simultaneously performing uniaxial stretching, the potassium iodide / boric acid / water in a weight ratio of 12 / 4.4 / 100 in a cross-linking bath at 55°C for 60 seconds, and then uniaxially stretched while performing water-resistant treatment until the cumulative stretching ratio from the original roll reached 5.5 times. Next, after immersing for 10 seconds in a 40° C. boric acid aqueous solution having a weight ratio of boric acid / potassium iodide / water of 9.0 / 2.9 / 100, it was immersed for 2 seconds in a washing tank fille...

Embodiment 2

[0134] Using a polyvinyl alcohol film with a thickness of 50 μm (trade name "kuraray Vinylon VF-PE#5000" manufactured by Kuraray Co., Ltd., degree of polymerization 2400, degree of saponification 99.9 mol%), the tension applied to the film in the water removal treatment was changed. Except having been 500 N / m, it carried out similarly to Example 1, and produced the polarizing film. Transmission inspection of the obtained polarizing film revealed that the number of defects larger than 100 μm was 0.05 pieces / m 2 .

Embodiment 3

[0136] Using a polyvinyl alcohol film with a thickness of 30 μm (trade name "kuraray Vinylon VF-PE#3000" manufactured by Kuraray Co., Ltd., degree of polymerization 2400, degree of saponification 99.9 mol%), the tension applied to the film in the water removal treatment was changed Except having been 450 N / m, it carried out similarly to Example 1, and produced the polarizing film. Transmission inspection of the obtained polarizing film revealed that the number of defects larger than 100 μm was 0.10 pieces / m 2 .

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Abstract

According to the present invention, after a cleaning process, a drying process is performed in which, while tension of 200-1500 N / m is maintained on a polarized film and while the film is wound on a first roll provided on one side of the film, air is blown on the film surface on the opposite side from the first roll to perform drying, and then, while the surface on which air was blown is wound onto a second roll, air is blown on the film surface on the opposite side from the second roll to perform drying, and the water removed by the air is recovered using a first exhaust container and a second exhaust container provided near the corresponding air-blowing positions.

Description

technical field [0001] This invention relates to the method of manufacturing a polarizing film, and the method of bonding a protective film to the polarizing film obtained by this, and manufacturing a polarizing plate. Background technique [0002] Conventionally, polarizing films in which dichroic dyes such as iodine are adsorbed and aligned on a polyvinyl alcohol-based resin film have been used. The polarizing film is usually made of a polarizing plate by attaching a protective film such as triacetyl cellulose to at least one side, usually both sides with an adhesive, and is used in liquid crystal display devices such as liquid crystal televisions, personal computer monitors, and mobile phones. . [0003] A polarizing film is produced by subjecting a polyvinyl alcohol-based resin film to swelling treatment, dyeing treatment, stretching treatment, crosslinking treatment (boric acid treatment), washing treatment, and finally drying. In such a manufacturing process, when a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30B29C55/06B32B7/02B32B27/30B29K29/00B29L7/00
CPCB29C55/06B29K2995/0034G02B5/3033B29K2029/04B29D11/00644B32B27/30B29C55/026B32B7/02
Inventor 网谷圭二
Owner SUMITOMO CHEM CO LTD
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