Azo Compound, Dye-Based Polarizing Film Containing Same, And Polarizing Plate

Patent metadata

Field	Value
Publication number	US-2017210902-A1
Application number	US-201515129236-A
Country	US
Kind code	A1
Filing date	Mar 27, 2015
Priority date	Mar 31, 2014
Publication date	Jul 27, 2017
Grant date	—

Abstract

The present invention relates to an azo compound that is useful as a dichroic pigment used in a polarizing plate having excellent polarizing performance and durability and having little color leakage in a visible light region, and used in a neutral gray polarizing plate for vehicle mounting that uses the aforementioned polarizing plate. More specifically, the invention relates to an azo compound that is represented by formula (1) [In the formula, R 1 -R 4 each independently represent a hydrogen atom, a C1-5 alkyl group, a C1-5 alkoxy group, a sulfo group, or a C1-5 alkoxy group having a sulfo group, X represents an amino group having a substituent, a benzoylamino group having a substituent, a phenylamino group having a substituent, a phenylazo group having a substituent, or a naphthotriazole group having a substituent, m represents 3 or 4, n represents 1 or 2, and p represents 1, 2, or 3.], or to a salt of said compound.

First claim

1 . An azo compound represented by the following formula (1):

wherein R 1 to R 4 each independently represent a hydrogen atom, an alkyl group having 1 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, a sulfo group or an alkoxy group having 1 to 5 carbon atoms and a sulfo group; X represents an amino group having a substituent, a benzoylamino group having a substituent, a phenylamino group having a substituent, a phenylazo group having a substituent or a naphthotriazole group having a substituent; m represents 3 or 4; n represents 1 or 2; and p represents 1, 2 or 3,
or a salt thereof.

2 . The azo compound according to claim 1 , wherein X is a phenylamino group represented by the following formula (2):

wherein R 5 and R 6 each independently represent a hydrogen atom, a methyl group, a methoxy group, a sulfo group, an amino group or a substituted amino group, or a salt thereof.

3 . The azo compound according to claim 1 , wherein X is a benzoylamino group represented by the following formula (3):

wherein R 7 represents a hydrogen atom, a hydroxy group, an amino group or a substituted amino group; or a salt thereof.

4 . The azo compound according to claim 1 , wherein X is a naphthotriazole group represented by the following formula (4):

wherein o represents 1 or 2; or a salt thereof.

5 . The azo compound according to claim 1 , wherein X is a phenylazo group represented by the following formula (5):

wherein R 8 to R 10 each independently represent a hydrogen atom, a hydroxy group, an alkyl group having 1 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, an amino group or a substituted amino group, or a salt thereof.

6 . The azo compound according to claim 1 , wherein R 1 and R 2 are hydrogen atoms, or a salt thereof.

7 . The azo compound according to claim 1 , wherein R 3 to R 6 each independently represent a hydrogen atom, a methyl group, a methoxy group or an alkoxy group having 1 to 5 carbon atoms and a sulfo group, or a salt thereof.

8 . The azo compound according to claim 1 , represented by the following formula (6):

wherein R 1 to R 4 , X, m, n and p are the same as defined in formula (1), or a salt thereof.

9 . A dye polarizing film containing a polarizing-film base containing the azo compound according to claim 1 or a salt thereof.

10 . A dye polarizing film containing a polarizing-film base containing the azo compound according to claim 1 or a salt thereof and at least one other organic dye.

11 . A dye polarizing film containing a polarizing-film base containing at least two azo compounds according to claim 1 or salts thereof and at least one other organic dye.

12 . The dye polarizing film according to claim 9 , wherein the polarizing-film base is a film formed of a polyvinyl alcohol resin or a derivative thereof.

13 . A dye polarizing plate obtained by attaching a transparent protecting layer onto at least one surface of the dye polarizing film according to claim 9 .

14 . A polarizing plate for a liquid crystal display using the dye polarizing film or dye polarizing plate according to claim 9 .

15 . An in-car neutral gray polarizing plate using the dye polarizing film or dye polarizing plate according to claim 9 .

16 . A liquid crystal display device using the dye polarizing plate according to any one of claims 13 to 15 .

Assignees

• Nippon Kayaku Kk
• Polatechno Co Ltd

Inventors

• Higeta Takahiro
• Nishiguchi Takuto
• Nakamura Mitsunori

Classifications

• C09B31/08 Primary

  from a coupling component "C" containing directive hydroxyl and amino groups · CPC title

• C09B31/20

  from a coupling component"D" containing a directive hydroxyl group · CPC title

• C09B31/22

  from a coupling component "D" containing directive hydroxyl and amino groups · CPC title

• G02B5/3025

  Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state (G02B5/3008, G02B5/3016 take precedence) · CPC title

• C09B31/30 Primary

  Other polyazo dyes · CPC title