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Polarization membrane and manufacturing method thereof, polarizer and optical laminate

A manufacturing method and polarizing film technology, applied in optics, optical elements, polarizing elements, etc., can solve problems such as polarizing film wrinkles and achieve the effect of less white spots

Active Publication Date: 2005-03-23
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the method described in Patent Document 3, there is a problem that wrinkles are generated on the polarizing film obtained.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] A polyvinyl alcohol film (Kurarevinylon VF-PS#7500, polymerization degree 2400, saponification degree 99.9 mol% or more) with a thickness of 75 μm was placed in pure water at 30°C so that the film was kept in a tense state without loosening, and immersed for about 130 seconds to fully swell the membrane.

[0063] Next, the film was uniaxially stretched while being dipped in an aqueous solution having a weight ratio of iodine / potassium iodide / water of 0.02 / 1.5 / 100 for dyeing treatment. Then, while immersing the film in an aqueous solution at 60° C. with a weight ratio of potassium iodide / boric acid / water of 10 / 5 / 100 to perform boric acid treatment, it was uniaxially stretched until the cumulative stretching ratio from the original back was 5.9 times.

[0064] Next, the film was immersed in an aqueous solution having a weight ratio of potassium iodide / boric acid / water of 10 / 3 / 100 at 40°C for about 30 seconds to perform the second boric acid treatment, while the stretchin...

Embodiment 2

[0068] Except not carrying out the boric acid treatment for the second time, the stretching of the film is relaxed about 3% along the stretching direction during washing (therefore, the final stretching ratio is 5.9×0.97=5.72 times), and the same operation as in Example 1, An iodine-based polarizing film was prepared. In any process, no wrinkles were generated.

[0069] In the same manner as in Example 1, protective films were laminated on both surfaces of the polarizing film to form a polarizer. This polarizer was observed for light leakage (white spots) in the same manner as in Example 1, and the result was the same as in Example 1.

Embodiment 3

[0071] In addition to performing the second boric acid treatment while immersing the film in an aqueous solution at 60°C with a weight ratio of potassium iodide / boric acid / water of 10 / 5 / 100 for about 30 seconds, the stretching of the film is relaxed by about 1% in the stretching direction , and further while washing with water, the stretching of the film was relaxed about 2% along the stretching direction (therefore, the final stretching ratio was 5.9×0.99×0.98=5.72 times), and the iodine-based Polarizing film. In any process, no wrinkles were generated.

[0072] In the same manner as in Example 1, protective films were laminated on both surfaces of the polarizing film to form a polarizer. In the same manner as in Example 1, this polarizer was observed for light leakage (white spots), and the result was the same as in Example 1.

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Abstract

Provided is a polarizing film which has few voids and is free of wrinkles and a method for manufacturing the same, and to provide a polarizing plate and an optical laminate. The polarizing film is obtained by treating a polyvinyl alcohol film in order of swelling treatment, dyeing treatment, boric acid treatment and rinse treatment, subjecting the film to uniaxial stretching in a boric acid treatment step and / or a step before the same and further alleviating the stretching of the film by 1 to 5% in the stretching direction in the at least one step after the stretching treatment. The polarizing plate is obtained by pasting a protective film to the at least one surface of the polarizing film. The optical laminate is obtained by pasting at least one kind selected from a retardation plate, a viewing angle improving film and a translucent reflection plate to the polarizing plate pasted with the protective film on the at least one surface.

Description

【Technical field】 [0001] The present invention relates to a polarizing film with less light leakage (white spots (ヌケ)) and no wrinkles, a method for producing the same, a polarizer having a protective film laminated on at least one side of the polarizing film, further laminating a retardation film, and enhancing brightness An optical laminate composed of any one or more of a sheet, a viewing angle improving film, and a semi-transmissive reflective film. 【Background technique】 [0002] Conventionally, as a polarizing film, a polyvinyl alcohol-based film in which an alignment dichroic dye is adsorbed is 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 generally formed into polarizers by laminating a protective film such as triacetyl cellulose on one or both sides of the polarizing film with an adhesive composed of an aqueous solu...

Claims

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Application Information

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IPC IPC(8): G02B5/30B29C55/04B29D11/00B29K29/00C08J5/18G02F1/1335
CPCB29C55/04B29D11/00644C08J5/18G02B5/3041G02F1/133528G02F1/133753
Inventor 松元浩二网谷圭二山根尚德藤本清二
Owner SUMITOMO CHEM CO LTD
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