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Iodine-containing polarizing film, process for producing the same, and polarizer comprising the same

A manufacturing method and technology of polarizing film, which is applied in the field of iodine-based polarizing plates, can solve the problems of increasing polarization degree, decolorization transmittance, and low transmittance, and achieve the effect of less change in transmittance and ensure display stability

Inactive Publication Date: 2008-03-05
NIPPON KAYAKU CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although the iodine-based polarizing plate is worse than the dye-based polarizing plate in terms of optical characteristics, it is not as good as the dye-based polarizing plate in terms of optical durability. Problems such as excessive rate increase and low polarization
In addition, in terms of dry heat durability, the degree of polarization decreases when exposed to high temperatures

Method used

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  • Iodine-containing polarizing film, process for producing the same, and polarizer comprising the same
  • Iodine-containing polarizing film, process for producing the same, and polarizer comprising the same
  • Iodine-containing polarizing film, process for producing the same, and polarizer comprising the same

Examples

Experimental program
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Effect test

Embodiment 1

[0086] A polyvinyl alcohol film with a degree of saponification of 99% or more and an average degree of polymerization of 2400 (trade name: VF-XS manufactured by KURARAY Co., Ltd.) was immersed in warm water at 40° C. for 2 minutes, stretched 1.30 times after swelling treatment was completed. The resulting film was mixed with boric acid (manufactured by Societa Chimica Larderellos.p.a.) 28.6 g / l, iodine (manufactured by Junsei Chemical Co., Ltd.) 0.25 g / l, potassium iodide (manufactured by Junsei Chemical Co., Ltd.) 17.7 g / l and ammonium iodide (manufactured by Junsei Chemical Co., Ltd.) (manufactured by Chemical Co., Ltd.) was immersed in an aqueous solution of 1.0 g / l at 30° C. for 2 minutes to perform dyeing treatment with iodine and iodide. The film obtained after the dyeing treatment was treated in an aqueous solution at 50° C. containing 30.0 g / l of boric acid for 5 minutes while being uniaxially stretched 5.0 times. The film obtained by the boric acid treatment was main...

Embodiment 2

[0091] In Example 1, the addition amount of aluminum sulfate 14-18 hydrate was changed to 0.2 g / l, the pH value was changed to 3.4, other same samples were made, and the durability of the dry heat test and the wet heat test were compared. The pH at the time of dissolving the polarizing film after the drying treatment was 5.3.

Embodiment 3

[0093] Change aluminum sulfate 14~18 hydrates in embodiment 1 to citric acid (anhydrous) (manufactured by Junzheng Chemical Co., Ltd.), the addition amount is 0.05g / l, and the pH value is changed to 4.8, make other identical samples, and The durability of the dry heat test and the damp heat test were compared.

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Abstract

A polarizing film obtained by stretching a polyvinyl alcohol resin film containing iodine, an iodide, and a crosslinking agent and / or water resistance imparter and then treating the film with a solution which contains either an inorganic acid other than boric acid or a salt thereof and / or an organic acid in an amount of 0.0001-5.0 wt.% and which has a pH of desirably 2-5, preferably 2.2-5. The polarizing film is excellent in wet heat durability and is less apt to decrease in polarizing properties in a wet heat durability test. The polarizing film obtained according to the preferred embodiment is excellent also in dry heat durability.

Description

technical field [0001] The present invention relates to an iodine-based polarizing film, a manufacturing method thereof, and an iodine-based polarizing plate using the iodine-based polarizing film. Background technique [0002] Polarizing plate is usually on the polarizing film formed by adsorption and orientation of dichroic pigment iodine or dichroic dye on polyvinyl alcohol-based resin film, and a protective film such as cellulose triacetate is pasted on one or both sides through an adhesive layer. formed, which can be used in liquid crystal display devices and the like. A polarizing plate formed of a polarizing film using dichroic dye iodine is called an iodine-based polarizing plate, while a polarizing plate formed of a polarizing film using a dichroic dye such as a dichroic dye is called a dye-based polarizing plate. Compared with dye-based polarizers, iodine-based polarizers have high transmittance and high polarization, that is, high contrast, and are widely used in...

Claims

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Application Information

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IPC IPC(8): G02B5/30G02F1/1335
Inventor 望月典明吉冈乾一郎田中兴一松下义昭
Owner NIPPON KAYAKU CO LTD
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