| 摘要 |
The purpose of the present invention is to provide azo compounds that are useful as dichroic pigments for use in a polarizer plate that has excellent polarization properties and durability while also exhibiting minimal color leakage in the visible light spectrum, and for use in a neutral-gray polarizer plate that is for use in a vehicle and includes the polarizer plate. Specifically provided are azo compounds represented by formula (1) (therein, A is either A1, a substituted phenyl group, or A2, a naphthyl group having a hydrogen atom, a hydroxy group, a sulfo group and/or a C1-4 alkoxy group that has a sulfo group, and R1-R4 each independently represent a hydrogen atom, a C1-4 alkyl group or a C1-4 alkoxy group) and salts thereof. |
