Azo compound and polarizing film and polarizing plate each containing the same
AssigneesNippon Kayaku Kabushiki Kaisha, Polatechno Co., Ltd.
InventorYuichi Sadamitsu
Life of this patent
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Abstract
A polarizing film or polarizing plate containing, as a dichroic dye, an azo compound whose free acid form is represented by the following formula (1): wherein R1 and R2 each independently represents sulfo, carboxy, lower alkyl, or lower alkoxy; R3 represents lower alkyl, lower alkoxy, or acetylamino; R4 to R6 each independently represents hydrogen, lower alkyl, lower alkoxy, or acetylamino; and R7 represents hydrogen, amino, or hydroxy. The polarizing film and plate are excellent in polarizing performance and durability and are highly reduced in color leakage in the visible light region.
Claims10
An azo compound represented by the following formula (1) or a salt thereof, or a copper complex compound of the azo compound or the salt thereof:
- wherein R1 and R2 each independently represents a sulfo group, a carboxyl group, a lower alkyl group or a lower alkoxyl group, R3 represents a lower alkyl group, a lower alkoxyl group or an acetylamino group, R4-R6 each independently represents a hydrogen atom, a lower alkyl group, a lower alkoxyl group or an acetylamino group, and R7 represents a hydrogen atom, an amino group or a hydroxyl group.
An azo compound represented by the following formula (18) or a salt thereof, or a copper complex compound of the azo compound or the salt thereof:
- wherein R11 represents an alkyl group or an alkoxyl group, R12 represents a sulfo group or a carboxyl group, R13 and R14 represent an alkyl group, an alkoxyl group or an acetylamino group, R15 and R16 represent an alkyl group or an alkoxyl group, and R17 represents a hydrogen atom or an amino group.
Dependencies are inferred from the claim text.