Azo compound and polarizing film and polarizing plate each...

C - Chemistry – Metallurgy – 09 – B

Patent

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C09B 31/22 (2006.01) G02B 5/30 (2006.01)

Patent

CA 2553415

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): [Chemical formula 1] (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.

Film polarisant ou plaque polarisante contenant, en tant que colorant dichroïque, un composé azoïque dont la forme d'acide libre est représentée par la formule suivante (1): [Formule chimique 1] (1) (dans laquelle R1 et R2 représentent chacun indépendamment un sulfo, un carboxy, un alkyle inférieur ou un alcoxy inférieur ; R3 représente un alkyle inférieur, un alcoxy inférieur ou un acétylamino ; R4 à R6 représentent chacun indépendamment un hydrogène, un alkyle inférieur, un alcoxy inférieur ou un acétylamino; et R7 représente un hydrogène, un amino, ou un hydroxy). Le film polarisant et la plaque polarisante sont excellents en terme de performance de polarisation et de durabilité et présentent une fuite de couleurs extrêmement réduite dans la région de la lumière visible.

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