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

• US 10,007,142 B2
• Filed: 11/16/2017
• Issued: 06/26/2018
• Est. Priority Date: 05/20/2015
• Status: Active Grant

• Current Assignee: Nippon Kayaku Company Limited, Polatechno Co.,Ltd.
• Original Assignee: Nippon Kayaku Company Limited, Polatechno Co.,Ltd.
• Inventors: Mochizuki, Noriaki, Higeta, Takahiro
• Primary Examiner(s): Hon, Sophie
• Application Number:
  US15/814,802
• Publication Number:
  US 20180074371A1
• Time in Patent Office: 222 Days
• CPC Class Codes: C09B 31/30 Other polyazo dyes
• CPC Class Codes: C09B 43/124 with monocarboxylic acids, carbamic esters or halides, mono- isocyanates, or haloformic acid esters
• CPC Class Codes: C09B 43/32 by reacting carboxylic or sulfonic groups, or derivatives thereof, with amines; by reacting keto-groups with amines
• CPC Class Codes: C09B 67/0046 Mixtures of two or more azo dyes
• CPC Class Codes: C09K 2323/031 Polarizer or dye
• CPC Class Codes: G02B 5/30 Polarising elements light-modulating devices with active elements G02F1/00
• CPC Class Codes: G02B 5/3025 Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state G02B5/3008, G02B5/3016 take precedence
• CPC Class Codes: G02F 1/1335 Structural association of cells with optical devices, e.g. polarisers or reflectors
• CPC Class Codes: G02F 1/133528 Polarisers

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).

Claims

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;

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

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.