AZO COMPOUND OR ITS SALT AND POLARIZING FILM CONTAINING THE COMPOUND OR ITS SALT

摘要

PROBLEM TO BE SOLVED: To provide a polarizing film while having durability under a high temperature and a high humidity condition and a high light fastness against a long time exposure, which are general characteristics of a dye-based polarizing film, also having a high polarization performance equal to that of an iodine-based film, and also a polarizing material of a dyestuff suitable for the polarizing film. SOLUTION: This azo compound expressed by formula (I) [wherein, A is phenyl having 1-2 sulfonyl and/or carboxyl or naphthyl having 1-3 sulfonyl; R1to R6are each the same or different and are each H, a 1-4C alkyl or 1-4C alkoxy; X is N=N or NHCO; Y is H, a 1-4C alkyl, 1-4C alkoxy, amino, hydroxy, carboxyl or sulfonyl; and Z is carboxyl or sulfonyl] or its salt, and the polarizing film containing the compound or its salt are provided. COPYRIGHT: (C)2006,JPO&NCIPI