申请人:Nippon Kayaku Kabushiki Kaisha
公开号:EP2206748A1
公开(公告)日:2010-07-14
Disclosed is an azo compound represented by the formula (1) or (2) or a salt thereof. The azo compound or the salt thereof has an excellent light-polarizing property, and is extremely useful as a dichroic dye for use in a polarizing plate that shows less color leakage in a visible light range or a polarizing plate for a liquid crystal projector comprising the aforementioned polarizing plate. (1) (2) wherein represents a hydrogen atom, a lower alkyl group, a lower alkoxy group, a hydroxyl group, a sulfonate group or a carboxyl group; R2 to R5 independently represent a hydrogen atom, a lower alkyl group, a lower alkoxy group or an acetylamino group; X represents a benzoylamino group which may have a substituent, a phenylamino group which may have a substituent, a phenylazo group which may have a substituent, or a naphthotriazole group which may have a substituent; m represents a numeral number of 1 or 2; and n represents a numeral number of 0 or 1.
本发明公开了一种由式(1)或(2)表示的偶氮化合物或其盐。该偶氮化合物或其盐具有极佳的光偏振特性,作为二向色染料用于在可见光范围内显示较少漏色的偏光板或用于包括上述偏光板的液晶投影仪的偏光板,非常有用。(1) (2) 其中代表氢原子、低级烷基、低级烷氧基、羟基、磺酸基或羧基;R2 至 R5 独立地代表氢原子、低级烷基、低级烷氧基或乙酰氨基;X 代表可能具有取代基的苯甲酰氨基基团、可能具有取代基的苯基氨基基团、可能具有取代基的苯基偶氮基团或可能具有取代基的萘三唑基团;m 代表 1 或 2 的数字;n 代表 0 或 1 的数字。