Polarizing film

A polarizing film and visible light technology, applied in polarizing elements, optics, instruments, etc., can solve problems such as low dichroic ratio

Inactive Publication Date: 2013-06-05
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, its dichroic ratio is still low in the present case

Method used

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Embodiment

[0039] The 6-amino-1,3-naphthalenedisulfonic acid is converted into a diazonium salt by using sodium nitrite and hydrochloric acid, and the diazonium salt and 5-amino-2-naphthalenesulfonic acid are reacted in an acidic cold-temperature aqueous solution. Coupling reaction to obtain monoazo compound. Next, the coupling reaction of the monoazo compound and 4-cyanobenzoyl chloride is performed in N-methylpyrrolidone to convert the sulfonate salt into a lithium salt, thereby obtaining a coupling reaction represented by the following formula (3) Nitrogen compound (a lyotropic liquid crystal showing a nematic liquid crystal phase in an aqueous solution).

[0040]

[0041] The above-mentioned azo compound was dissolved in ion-exchanged water, and its concentration was adjusted to 5% by weight to prepare a coating liquid. The coating liquid was applied to a rubbing-treated and corona-treated cycloolefin polymer film (manufactured by Zeon Corporation, trade name: "ZEONOR", thickness: 50 μ...

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Abstract

The present invention provides a polarizing film containing an azo compound represented by the following formula (1): in which X is a hydrogen atom, a halogen atom, a nitro group, a cyano group, an alkyl group having 1 to 3 carbon atoms or an alkoxy group having 1 to 4 carbon atoms, and M is a counter ion.

Description

Technical field [0001] The present invention relates to a polarizing film that shows a high dichroic ratio on the short wavelength side of visible light. Background technique [0002] As described in JP-A-2008-133421, azo compounds (dichroic dyes) that exhibit absorption dichroism in the short wavelength region (380 to 500 nm) of visible light have been known so far. For example, by mixing such azo compounds with dyes that exhibit absorption dichroism in the long wavelength region of visible light (greater than 500 nm to 780 nm), such azo compounds are used to prepare neutral gray polarizing films (between 380 and 780 nm). A polarizing film with an average transmittance and an average degree of polarization in a wide visible light region of 780 nm). [0003] However, although the azo compound described in the above-mentioned JP-A-2008-133421 shows a relatively high dichroic ratio on the short wavelength side (380 to 500 nm) of visible light, its dichroic ratio is at most about 30 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/30
CPCC09K19/601G02B5/223G02B5/3025C09K2323/031C09K2323/03C08J5/18G02B5/30C09B29/095
Inventor 尾之内久成中西贞裕
Owner NITTO DENKO CORP
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