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Process for producing polarizing film

A manufacturing method and technology for polarizing films, which are applied in optics, optical elements, polarizing elements, etc., can solve the problems of film wrinkle appearance, uneven film thickness, deterioration, etc., and achieve excellent appearance, inhibition of uneven swelling, and inhibition of wrinkles. Effect

Active Publication Date: 2015-11-25
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, there is a problem that if only the bath temperature of the swelling treatment tank at the front end is increased as described in Patent Document 1, the film will rapidly swell due to the high treatment te

Method used

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  • Process for producing polarizing film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075]Prepare a long polyvinyl alcohol film with a thickness of 60 μm [trade name "Kuraray PovalFilm VF-PE #6000" manufactured by Kuraray, degree of polymerization 2400, degree of saponification 99.9 mol% or more], as a swelling treatment, add 37 ° C In the first swelling treatment tank of pure water, the film was immersed for 40 seconds while maintaining the tense state so that the film did not loosen. Thereafter, the membrane was immersed for 20 seconds in a second swelling treatment tank filled with pure water at 30°C. At this time, the film was transported using a tenter roll in the first swelling treatment tank. Next, as a dyeing treatment, immerse in a dyeing treatment tank containing an aqueous solution of 30° C. containing iodine and potassium iodide for 60 seconds, while performing uniaxial stretching at 2.2 times, after adding potassium iodide / boric acid / water by weight ratio Water-resistant treatment was performed by immersing in a boric acid treatment tank of 55° ...

Embodiment 2

[0083] Using a long polyvinyl alcohol film with a thickness of 50 μm [trade name "Kuraray PovalFilm VF-PE#5000" manufactured by Kuraray, degree of polymerization 2400, degree of saponification 99.9 mol% or more] as the original film, put the film in the first swelling treatment tank A polarizing film was produced in the same manner as in Example 1 except that the swelling treatment was changed to immersion in 35° C. pure water for 30 seconds. No wrinkles were observed during the swelling treatment, nor was there any breakage of the film.

[0084] (A) Saturation expansion ratio in the first swelling treatment tank

[0085] From the polyvinyl alcohol film "KurarayPovalFilmVF-PE#5000" used in Example 2, the film fragments were cut out, and the temperature of the pure water in the water tank was changed to 35°C, except that it was obtained in the same manner as in Example 1 (A). Obtain the saturation expansion ratio in the first swelling treatment tank. After dipping, the length...

Embodiment 3

[0091] A long polyvinyl alcohol film with a thickness of 60 μm [trade name "Kuraray PovalFilm VF-PE#6000" manufactured by Kuraray Co., Ltd., a degree of polymerization of 2400, a degree of saponification of 99.9 mol% or more] was used as the original film, and as a swelling treatment, after adding The film was immersed in a swelling treatment tank of pure water at 37° C. for 40 seconds while maintaining a tensioned state so that the film would not sag. At this time, in the swelling treatment tank, the film was conveyed using a tenter roll. Next, as a dyeing treatment, immerse in a dyeing treatment tank containing an aqueous solution of 30° C. containing iodine and potassium iodide for 60 seconds, while performing uniaxial stretching until stretched to 2.2 times. After adding potassium iodide / boric acid / water to Water-resistant treatment was performed by immersing in a boric acid treatment tank at 55° C. in a weight ratio of 12 / 4.4 / 100, and uniaxially stretched until the cumula...

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Abstract

In this process for producing a polarizing film, in cases when the swelling is conducted with a plurality of swelling tanks, the treatment temperatures in a first swelling tank and a subsequent second swelling tank and the treatment times over which the film passes through the treatment tanks are controlled so that the film in the first swelling tank has a degree of width-direction swelling which is 90% or less of the degree of saturation swelling in the treating liquid having the same temperature and composition and that the difference between the degree of swelling of the film in the first swelling tank and the degree of width-direction swelling of the film in the second swelling tank is within 2 points in terms of absolute value. In cases when the swelling is conducted with one swelling tank, the treatment temperatures in the swelling tank and a subsequent dyeing tank and the times over which the film passes through the treatment tanks are controlled so that the film in the swelling tank has a degree of width-direction swelling which is 90% or less of the degree of saturation swelling in the treating liquid having the same temperature and composition and that the difference between the degree of swelling of the film in the swelling tank and the degree of width-direction swelling of the film in the dyeing tank is within 2 points in terms of absolute value.

Description

technical field [0001] The present invention relates to a method of manufacturing a polarizing film used in a liquid crystal display device. Background technique [0002] Conventionally, polarizing films obtained by adsorbing and aligning a dichroic dye on a polyvinyl alcohol-based resin film have been used. That is, an iodine-based polarizing film using iodine as a dichroic dye, a dye-based polarizing film using a dichroic dye as a dichroic dye, and the like are known. These polarizing films are usually made into polarizers by laminating a protective film such as cellulose triacetate on at least one side, preferably both sides, via an adhesive formed from an aqueous solution of a polyvinyl alcohol-based resin, and are used for LCD TVs and personal computers. Liquid crystal display devices such as monitors and mobile phones. [0003] The polarizing film is produced by subjecting a polyvinyl alcohol-based resin film to swelling treatment, dyeing treatment, stretching treatm...

Claims

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Application Information

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IPC IPC(8): G02B5/30C08J7/02C08L29/04
CPCC08J7/02G02B5/3033G02B5/3025
Inventor 纲谷圭二
Owner SUMITOMO CHEM CO LTD