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

Patent metadata

Field	Value
Publication number	US-2022010139-A1
Application number	US-201917414571-A
Country	US
Kind code	A1
Filing date	Dec 17, 2019
Priority date	Dec 27, 2018
Publication date	Jan 13, 2022
Grant date	—

Abstract

An azo compound represented by the following formula (1) or a salt thereof, Wherein
A 1 represents a naphthyl group which may have a substituent; A 2 , A 3 , and A 4 each independently represent a phenyl group which may have a substituent or a naphthyl group which may have a substituent; R 1 represents a hydrogen atom, a hydroxy group, a C1-4 alkoxy group, or a substituted or unsubstituted amino group; m represents an integer of 0 to 5; M represents a hydrogen atom or ion, a metal ion, or an ammonium ion; n represents 1 or 2; k represents 0 or 1; and each hydrogen atom on ring a and ring b may be substituted with the substituent R 1 or substituent SO 3 M.

First claim

1 . An azo compound represented by the following formula (1) or a salt thereof:

wherein
A 1 represents a naphthyl group which may have a substituent;
A 2 , A 3 and A 4 each independently represent a phenyl group which may have a substituent or a naphthyl group which may have a substituent;
R 1 represents a hydrogen atom, a hydroxy group, a C1-4 alkoxy group or a substituted or unsubstituted amino group;
m represents an integer of 0 to 5;
M represents a hydrogen atom or ion, a metal ion, or an ammonium ion;
n represents 1 or 2;
k represents 0 or 1; and
each hydrogen atom on ring a and ring b may be substituted with the substituent R 1 or substituent SO 3 M.

2 . The azo compound or a salt thereof according to claim 1 , wherein A 1 in the above formula (1) represents a naphthyl group having one or more substituents selected from the group consisting of a hydroxy group, a C1-4 alkoxy group having a sulfo group, and a sulfo group.

3 . The azo compound or a salt thereof according to claim 1 , wherein A 2 , A 3 and A 4 in the above formula (1) are each independently represented by the following formula (2) or formula (3), and at least one of A 2 , A 3 and A 4 is represented by the formula (2):

wherein
R 2 represents a hydrogen atom, a hydroxy group, a C1-4 aliphatic hydrocarbon group, a C1-4 alkoxy group, a substituted or unsubstituted amino group, or a C1-4 alkoxy group having a sulfo group;
m 2 represents an integer of 0 to 6;
M represents a hydrogen atom or ion, a metal ion or an ammonium ion; and
n 3 represents an integer of 0 to 2, and

wherein
R 3 and R 4 each independently represent a hydrogen atom, a C1-4 aliphatic hydrocarbon group, a C1-4 alkoxy group, a C1-4 alkoxy group having a hydroxy group, or a C1-4 alkoxy group having a sulfo group.

4 . The azo compound or a salt thereof according to claim 1 , wherein A 1 in the above formula (1) is represented by the following formula (4):

wherein n 4 represents 1 or 2.

5 . The azo compound or a salt thereof according to claim 1 , wherein the above formula (1) is represented by the following formula (5):

wherein
A 1 , A 2 , A 3 , A 4 , M, n and k are each the same as those in the above formula (1); and
each hydrogen atom on ring a and ring b may be substituted with a substituent SO 3 M.

6 . The azo compound or a salt thereof according to claim 1 , wherein the above formula (1) is represented by the following formula (6):

wherein
R 5 , R 6 and R 7 each independently represent a hydrogen atom, a hydroxy group, a C1-4 alkoxy group or a substituted or unsubstituted amino group;
m 3 to m 5 each independently represent an integer of 0 to 5;
M represents a hydrogen atom or ion, a metal ion or an ammonium ion;
n 5 and n 6 each independently represent 1 or 2; and
k 1 represents 0 or 1.

7 . A polarizing film, comprising at least one azo compound or a salt thereof according to claim 1 .

8 . The polarizing film according to claim 7 , wherein at least one of wavelengths at which an absorbance ratio Rd (=A H /A L ) of an absorbance (A H ) on an axis giving the lowest transmittance of polarized light to an absorbance (A L ) on an axis giving the highest transmittance of the polarized light indicates a value of 5 or higher is in 700 to 1,500 nm.

9 . The polarizing film according to claim 7 , further comprising one or more organic dyes other than the azo compound or the salt thereof.

10 . The polarizing film according to claim 7 , wherein the polarizing film exhibits neutral gray.

11 . The polarizing film according to claim 7 , using a film comprising a polyvinyl alcohol resin or a derivative thereof as a base material.

12 . A polarizing plate, comprising a transparent protection layer on at least one surface of the polarizing film according to claim 7 .

13 . A display, comprising a polarizing film according to claim 7 .

14 . The display according to claim 13 , wherein the display is used for vehicular usage or outdoor display usage.

15 . A display, comprising a polarizing plate according to claim 12 .

Assignees

• Nippon Kayaku Kk

Inventors

• Hattori yu
• Morita Ryoutarou
• Mochizuki Noriaki

Classifications

• G02B5/3033 Primary

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

• G02B1/08

  made of polarising materials · CPC title

• C09B31/22

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

• C09B31/20 Primary

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

• C09B31/18

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