Azo compound, dye-based polarizing film and polarizing plate

Patent metadata

Field	Value
Publication number	US-9341746-B2
Application number	US-201514813163-A
Country	US
Kind code	B2
Filing date	Jul 30, 2015
Priority date	Feb 7, 2011
Publication date	May 17, 2016
Grant date	May 17, 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, at least one kind of an azo compound and/or a salt thereof, which is represented by the following formula (7):

wherein, A represents a phenyl group which may have at least one 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, or an alkoxy group having a sulfo group and a carbon atom number of 1 to 5, X represents a benzoylamino group represented by the following formula (3):

wherein R 9 represents a hydrogen atom or an unsubstituted amino group; and/or a salt thereof.

2. The dye-based polarizing film according to claim 1 , wherein at least one of the substituents of A is a sulfo group or a carboxy group, and a substituent other than that is not present or is a sulfo 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 alkoxy group having a sulfo group and a carbon atom number of 1 to 5, a carboxy group, a nitro group, an amino group or a substituted amino group.

3. The dye-based polarizing film according to claim 1 , wherein A is 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.

4. The dye-based polarizing film 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.

5. The dye-based polarizing film according to claim 1 , wherein A is a disulfo-substituted phenyl group, 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 benzoylamino group substituted with an unsubstituted amino group.

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 one kind of other organic dyes in the polarizing raw film.

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

8. The dye-based polarizing film according to claim 1 wherein the film is a color dye-based polarizing film.

9. 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.

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

11. 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 .

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

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

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

Assignees

• 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

• G02B1/08 Primary

  made of polarising materials · CPC title

• B32B2457/202

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

• C09B31/30 Primary

  Other polyazo dyes · CPC title