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Process for producing a polarizing film

A manufacturing method and polarizing film technology, applied in optics, optical elements, polarizing elements, etc., can solve problems such as foreign matter defects, and may not be able to fully suppress wrinkles, foreign matter defects, scratches, etc.

Active Publication Date: 2010-10-06
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the above-mentioned production method, there are problems in that the appearance is deteriorated in the cleaning treatment: wrinkling occurs on the film, or foreign matter defects occur due to the precipitation of the boric acid compound on the film surface due to the boric acid treatment, and the resulting polarized light Color deviation, foreign matter defects, scratches, etc. occur on the film
[0008] However, in P2003-240947-A and JPH08-327823-A, there is no specific description of the film width before and after cleaning treatment. The current situation is that even if the method described in P2003-240947-A and JPH08-327823-A is used, It is not necessarily possible to sufficiently suppress the occurrence of wrinkles and foreign matter defects, but it is desired to develop a production method of a polarizing film with a better appearance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] Dip a polyvinyl alcohol film with a width of 450 mm and a thickness of 75 μm (Cola Li Vinylon VF-PS#7500, a degree of polymerization of 2400, a degree of saponification of 99.9 mol % or more) in pure water at 30°C in a tensioned state so that the film does not relax. 100 seconds to fully swell the membrane.

[0081] Then, uniaxial stretching was carried out while dipping in an aqueous solution of iodine / potassium iodide / water in a weight ratio of 0.02 / 1.5 / 100. Then, immerse in an aqueous solution of potassium iodide / boric acid / water at a weight ratio of 12 / 4.4 / 100 at 55° C., perform boric acid treatment (water resistance treatment), and perform uniaxial stretching until the cumulative stretching ratio relative to the raw material is 5.5 times, after that, dip in an aqueous solution at 40°C with a weight ratio of potassium iodide / boric acid / water of 9 / 2.9 / 100.

[0082] Then, it was dipped and washed in pure water at 5° C. for 8 seconds. After this washing process, it d...

Embodiment 2

[0084] Set up 2 cleaning tanks. In the first stage, immerse and wash for 8 seconds in an aqueous solution at 15°C with a weight ratio of potassium iodide / boric acid / water of 0.3 / 0.15 / 100; in the second stage, immerse in pure water at 15°C Except washing for 3 seconds, it carried out similarly to the said Example 1, and obtained the polarizing film with a thickness of 28 micrometers.

[0085] At this time, the content of the boron compound in the film before the cleaning treatment in the first stage was 4.25% by weight, and the content of the boron compound in the film after the cleaning treatment was 4.03% by weight. Furthermore, the content of the boron compound in the film before the cleaning treatment in the second stage was 4.03% by weight, and the content of the boron compound in the film after the cleaning treatment was 3.95% by weight. In addition, the residual ratio in the first stage was 0.95, and the residual ratio in the second stage was 0.98, and no wrinkling was f...

Embodiment 3

[0088] A polarizing film with a thickness of 28 μm was obtained in the same manner as in Example 1, except that the potassium iodide / boric acid / water weight ratio was 0.6 / 0.3 / 100 in an aqueous solution at 25° C. and washed for 48 seconds. The content of the boron compound in the film before the cleaning treatment at this time was 4.25% by weight, and the content of the boron compound in the film after the cleaning treatment was 3.40% by weight. In addition, the residual ratio was 0.80, and no wrinkles were observed in the film during the cleaning treatment. Moreover, no foreign matter defect was found to occur, and the obtained polarizing film had good appearance such as no color deviation, no foreign matter defect, and no scratches.

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Abstract

The invention provides a process for producing a polarizing film, performing swelling treatment, dyeing treatment, boric acid treatment washing treatment for polyvinyl alcohol films and performing single axle stretching before treatment and / or in treatment, wherein when the boron compound content in the film before washing is Y and the boron compound content in the film after washing is X, the residual rate of the boron compound content before and after washing treatment at one time is 0.7-0.98; or when the film width before washing treatment is A and the film width after washing treatment is B, A / B before and after washing treatment at one time is 0.97-1.03. The invention provides the process for producing the polarizing film having a good appearance without color deviation, foreign matter defects nor dints.

Description

technical field [0001] The invention relates to a method for manufacturing a polarizing film with good appearance. Background technique [0002] Conventionally, a film in which a dichroic dye is adsorbed and oriented on a polyvinyl alcohol-based film has been used as a polarizing film. That is, iodine-based polarizing films using iodine as a dichroic dye, dye-based polarizing films using a dichroic dye as a dichroic dye, and the like are known. Usually, protective films such as triacetyl cellulose are bonded to at least one side, preferably both sides of these polarizing films with an adhesive composed of an aqueous solution of polyvinyl alcohol-based resin or the like to form a polarizing plate. [0003] As a method for producing a polarizing film, a method is known in which a polyvinyl alcohol-based film is dyed with the above-mentioned dichroic dye and stretched using nip rolls or guide rolls, and then the polyvinyl alcohol film is dyed to fix iodine on the film. The al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30G02B1/10
CPCC08J5/18G02B1/14G02B5/3033G02F1/133528
Inventor 纲谷圭二难波明生
Owner SUMITOMO CHEM CO LTD
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