Azo compound, dye-based polarizing film and polarizing plate

Patent metadata

Field	Value
Publication number	US-9244198-B2
Application number	US-201213980184-A
Country	US
Kind code	B2
Filing date	Feb 6, 2012
Priority date	Feb 7, 2011
Publication date	Jan 26, 2016
Grant date	Jan 26, 2016

Abstract

The present invention relates to an azo compound represented by the following formula (1), [wherein, A represents a phenyl group which may have a substituent, R 1 to R 6 each independently represent a hydrogen atom, an alkyl group having a carbon atom number of 1 to 5, an alkoxy group having a carbon atom number of 1 to 5, a sulfo group, or an alkoxy group having a sulfo group and a carbon atom number of 1 to 5, and X represents an amino group which may have a substituent, a benzoylamino group which may have a substituent, a phenylamino group which may have a substituent, a phenylazo group which may have a substituent, or a naphthotriazole group which may have a substituent] or/and a salt thereof and to a polarizing film and a polarizing plate which contain it.

First claim

The invention claimed is:

1. A dye-based polarizing film containing in a polarizing raw film, an azo compound and/or a salt thereof, which is represented by the following formula (7):

wherein, A represents a phenyl group, R 1 to R 6 each independently represent a hydrogen atom, an alkyl group having a carbon atom number of 1 to 5, an alkoxy group having a carbon atom number of 1 to 5, or an alkoxy group having a sulfo group and a carbon atom number of 1 to 5,
X represents a phenylamino group, a phenylazo group, or a naphthotriazole group,
wherein A is a phenyl group represented by the following formula (6):

wherein, one of R 13 and R 14 is a sulfo group and the other represents a hydrogen atom, a sulfo group, an alkyl group having a carbon atom number of 1 to 5, or an alkoxy group having a carbon atom number of 1 to 5;
wherein the phenylamino group is represented by the following formula (2):

wherein, R 7 and R 8 each independently represent a hydrogen atom, a methyl group, a methoxy group, a sulfo group, an amino group or a substituted amino group;
wherein the phenylazo group is represented by the following formula (5):

wherein, R 10 to R 12 each independently represent a hydrogen atom, a hydroxy group, an alkyl group having a carbon atom number of 1 to 5, an alkoxy group having a carbon atom number of 1 to 5, an amino group or a substituted amino group; and
wherein the naphthotriazole group is represented by the following formula (4):

wherein, m represents 1 or 2.

2. The dye-based polarizing film containing the azo compound and/or a salt thereof according to claim 1 , wherein R 1 to R 6 are each independently a hydrogen atom, a methyl group, a methoxy group, a sulfo group, an alkoxy group having a sulfo group and a carbon atom number of 1 to 5.

3. The dye-based polarizing film containing the azo compound and/or a salt thereof according to claim 1 , wherein A is a disulfo-substituted phenyl group (R 13 and R 14 are sulfo groups), R 2 , R 4 and R 6 are each independently a methyl group or a methoxy group, R 1 and R 3 are each independently a hydrogen atom, a methyl group, a methoxy group or a sulfopropoxy group, R 5 is a methyl group or a methoxy group, and X is a unsubstituted phenylamino group (R 7 and R 8 are hydrogen atoms), a phenylamino group having at least one of R 7 and R 8 selected from the group consisting of a methoxy group, a sulfo group and an amino group as a substituent, or a disulfo-substituted naphthotriazole (m=2).

4. The dye-based polarizing film containing the azo compound and/or a salt thereof according to claim 3 , wherein R 2 and R 4 are methyl groups, R 6 is a methyl group or a methoxy group, and X is an unsubstituted phenylamino group (R 7 and R 8 are hydrogen atoms) or a methoxy-substituted phenylamino group (one of R 7 and R 8 is a hydrogen atom and the other is a methoxy group).

5. The dye-based polarizing film containing at least one kind of the azo compound and/or a salt thereof according to claim 1 and at least one kind of other organic dye.

6. The dye-based polarizing film containing at least one kind of the azo compound and/or a salt thereof according to claim 1 and at least two kinds of other organic dyes.

7. The dye-based polarizing film containing at least one kind of the azo compound and/or a salt thereof according to claim 1 is a color dye-based polarizing film.

8. The dye-based polarizing film according to claim 1 , wherein the polarizing raw film is a film comprising a polyvinyl alcohol resin, a vinyl alcohol copolymer resin or a modified polyvinyl alcohol resin.

9. The dye-based polarizing film according to claim 8 , wherein the polarizing raw film is a polyvinyl alcohol resin film.

10. A dye-based polarizing plate with a transparent protective film being attached on at least one surface of the dye-based polarizing film according to claim 1 .

11. A liquid crystal display equipped with the dye-based polarizing plate according to claim 10 .

12. A liquid crystal display comprising the dye-based polarizing film according to claim 1 .

13. A liquid crystal projector comprising the dye-based polarizing film according to claim 1 .

Assignees

• Higeta Takahiro
• Nishiguchi Takuto
• Nippon Kayaku Kk
• Polatechno Co Ltd

Inventors

• Higeta Takahiro
• Nishiguchi Takuto

Classifications

• C08L29/04

  Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids · CPC title

• G02B5/3033

  in the form of a thin sheet or foil, e.g. Polaroid · CPC title

• B32B2457/202

  LCD, i.e. liquid crystal displays · CPC title

• Y10T428/1041

  Cross-Sectional Technologies · mapped topic

• G02B1/04

  made of organic materials, e.g. plastics (G02B1/08 takes precedence) · CPC title