Dichroic azo-azomethine dyes of formula (A) or (B), wherein Ar1 to Ar10 are specific (hetero)aromatic moieties and L is a linking group, as defined in the present claims, a dichroic dye mixture comprising said azo-azomethine dyes and a process for preparing the dyes are provided. The dyes are well suited for combination with liquid crystal material for use, inter alia, in a light absorption anisotropic element, for example,in a switchable optical device or an optically anisotropic film.
二色性偶氮偶亚甲基
染料的
化学式(A)或(B),其中Ar1至Ar10是特定的(杂)芳香基团,L是一个连接基团,如本申请中所定义的,提供了一种包括所述偶氮偶亚甲基
染料的二色性
染料混合物以及制备这些
染料的方法。这些
染料非常适合与液晶材料结合使用,例如,在光吸收各向异性元件中,例如,在可切换的光学器件或光学各向异性薄膜中。