公开(公告)号：US20220098412A1

公开(公告)日：2022-03-31

申请号：US17427403

申请日：2020-01-17

Applicant: BASF SE

Inventor： Leonhard FEILER ,  Thomas RUCH ,  Frank BACHMANN ,  Marie-Pascale PERRITAZ ,  Gerardus DE KEYZER

IPC: C09B31/053 ,  C09B31/043 ,  C09B31/30 ,  C09B31/26 ,  C09K19/60

Abstract: 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.