Dye-based polarizer as well as polarizing plate and liquid crystal display device using the polarizer

Patent metadata

Field	Value
Publication number	US-10007142-B2
Application number	US-201715814802-A
Country	US
Kind code	B2
Filing date	Nov 16, 2017
Priority date	May 20, 2015
Publication date	Jun 26, 2018
Grant date	Jun 26, 2018

Abstract

A polarizer contains, in a base thereof, at least one of an azo compound represented by Formula (1) or a salt thereof (as compound A), and at least one of an azo compound represented by Formula (2-I), (2-II), (3), (4-I), (4-II), (5-I) or (5-II), or a salt thereof (as compound B).

First claim

What is claimed is:

1. A polarizer containing: in a base thereof,
at least one of an azo compound represented by the following Formula (1) or a salt thereof (as compound A); and
at least one of an azo compound represented by the following Formula (2-I), (2-II), (3), (4-I), (4-II), (5-I) or (5-II), or a salt thereof (as compound B):
the compound A:

wherein Ar 1 represents a phenyl group or a naphthyl group having at least one substituent of a sulfo group or a carboxy group; and
Rr 1 to Rr 4 each independently represent a hydrogen atom, a lower alkyl group, a lower alkoxy group or a lower alkoxy group having a sulfo group,
the compound B:

wherein Ab 1 represents a phenyl group or a naphthyl group having at least one substituent of a sulfo group or a carboxy group;
Rb 1 to Rb 5 each independently represent a hydrogen atom, a lower alkyl group, a lower alkoxy group or a lower alkoxy group having a sulfo group; and
Xb 1 represents an amino group, a phenylamino group, a phenylazo group, a naphthotriazole group or a benzoylamino group optionally having at least one substituent selected from the group consisting of a lower alkyl group, a lower alkoxy group, a sulfo group, an amino group, a lower alkylamino group, a hydroxyl group, a carboxy group and a carboxyethyl amino group,

wherein Ab 2 represents a phenyl group or a naphthyl group having at least one substituent of a sulfo group or a carboxy group; and
Xb 2 represents a phenylamino group, a phenylazo group, a naphthotriazole group or a benzoylamino group optionally having at least one substituent selected from the group consisting of a lower alkyl, a lower alkoxy group, a hydroxyl group, a carboxy group, a sulfo group, an amino group and a substituted amino group,

wherein Ab 3 represents a phenyl group or a naphthyl group having at least one substituent of a sulfo group or a carboxy group;
Rb 6 to Rb 8 each independently represent a hydrogen atom, a lower alkyl group, a lower alkoxy group or a lower alkoxyl group having a sulfo group; and
Xb 3 represents an amino group, a phenylamino group, a phenylazo group, a benzoyl group, a benzoylamino group or a naphthotriazole group optionally having at least one substituent selected from the group consisting of a lower alkyl, a lower alkoxy group, a hydroxyl group, a carboxy group, a sulfo group, an amino group, a substituted amino group and an aminonaphthyl group, and

wherein Ag 1 represents a nitro group or an amino group,
Xg 1 represents: an amino group optionally having at least one substituent selected from the group consisting of a lower alkyl group, a lower alkoxy group and a sulfo group;
a benzoyl group or a benzoylamino group optionally having at least one substituent selected from the group consisting of a lower alkyl group, a lower alkoxy group, a sulfo group, an amino group and a substituted amino group;
a phenylamino group optionally having at least one substituent selected from the group consisting of a lower alkyl group, a lower alkoxy group, a sulfo group, an amino group and a substituted amino group;
a phenylazo group optionally having at least one substituent selected from the group consisting of a lower alkyl group, a lower alkoxy group, a sulfo group, a hydroxyl group, an amino group and a substituted amino group; or
a naphthotriazole group optionally having at least one substituent selected from the group consisting of a lower alkyl group, a lower alkoxy group, a sulfo group, an amino group and a substituted amino group,
Rg 1 and Rg 2 of Formula (5-I) each independently represent a hydrogen atom, a hydroxyl group, a lower alkyl group, a lower alkoxy group or a lower alkoxy group having a sulfo group, and
Rg 2 of Formula (5-II) represents a hydrogen atom, a hydroxyl group, a lower alkyl group, a lower alkoxy group or a lower alkoxy group having a sulfo group.

2. The polarizer according to claim 1 , wherein the compound represented by Formula (1) is represented by the following Formula (1′):

wherein Ar 1 and Rr 1 to Rr 4 are the same as defined in claim 1 .

3. The polarizer according to claim 1 , further containing, in the base, at least one of an azo compound represented by the following Formula (6) or a salt thereof (as compound C):

wherein Ay 1 and Ay 2 each independently represent a sulfo group, a carboxy group, a hydroxyl group, a lower alkyl group or a lower alkoxyl group;
Ry 1 to Ry 8 each independently represent a hydrogen atom, a sulfo group, a lower alkyl group or a lower alkoxyl group; and
p represents an integer of 1 to 3.

4. The polarizer according to claim 1 , wherein the base is a film made of a polyvinyl alcohal-based resin.

5. A polarizing plate comprising a transparent protection layer on at least one surface of the polarizer according to claim 1 .

6. A liquid crystal display device comprising the polarizer according to claim 1 .

7. A liquid crystal display device comprising the polarizing plate according to claim 5 .

Assignees

• Nippon Kayaku Kk
• Polatechno Co Ltd

Inventors

• Mochizuki Noriaki
• Higeta Takahiro

Classifications

• C09B43/124

  with monocarboxylic acids, carbamic esters or halides, mono- isocyanates, or haloformic acid esters · CPC title

• C09B31/30 Primary

  Other polyazo dyes · CPC title

• C09B67/0046

  Mixtures of two or more azo dyes · CPC title

• C09B43/32

  by reacting carboxylic or sulfonic groups, or derivatives thereof, with amines; by reacting keto-groups with amines · CPC title

• G02F1/133528 Primary

  Polarisers · CPC title