# US 8,771,378 B2 · Azo compound and salt thereof, and dye-containing polarizing film comprising the compound or salt

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- Number: US 8,771,378 B2
- Document ID: US8771378B2
- Status: Granted
- Kind: B2
- Application number: 12/948,404
- Filed: 2010-11-17
- Published: 2011-03-10
- Granted: 2014-07-08
- Earliest claimed: 2006-06-01
- Assignees: Nippon Kayaku Kabushiki Kaisha; Polatechno Co., Ltd.
- Applicants: Yuichi Sadamitsu; Takuto Nishiguchi; Hiroaki Ohno
- Inventors: Yuichi Sadamitsu; Takuto Nishiguchi; Hiroaki Ohno
- Web page: https://patentgrep.com/patent/US8771378B2

## CPC

- G02B 5/305: {including organic materials, e.g. polymeric layers}
- C09B 56/04: Stilbene-azo dyes {(disazo dyes from diaminostilbene, C09B35/215)}
- C09K 2323/031: Polarizer or dye
- G02B 5/30: Polarising elements (light-modulating devices with active elements G02F1/00)
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- C09B: ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES {, e.g. PIGMENTS}; MORDANTS; LAKES (fermentation or enzyme using processes to synthesise a desired chemical compound C12P)
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE

## Abstract

Disclosed is an azo compound represented by the general formula (1) or a salt thereof: wherein R1 and R2 independently represent a hydrogen atom, a lower alkyl group or a lower alkoxy group; and n represents 1 or 2. Also disclosed are a dye-containing polarizing film and a dye-containing polarizing plate, each of which comprises a polarizing film base material and the azo compound contained in the base material.

## Claims

### Claim 1

An azo compound represented by the following formula (1) and a salt thereof:
wherein R1 and R2 each independently represent a hydrogen atom, a lower alkyl group, and a lower alkoxy group; n is 2.

### Claim 2 (depends on 1)

The azo compound and a salt thereof according to claim 1, wherein R1 and R2 are each independently one of a hydrogen atom, a methyl group, and a methoxy group.

### Claim 3 (depends on 1)

The azo compound and a salt thereof according to claim 1, wherein R1 and R2 are a hydrogen atom.