POLY-AZO COMPOUND, AND POLARIZATION FILM HAVING SAID COMPOUND

摘要

Poly-azo compound selected from the group consisting compounds of the formula (I) and compounds of the formula (II), (wherein, Me represents copper, nickel, zinc or iron, A represents a naphthyl group having 1 to 3 sulfonic groups and further optionally having an alkyl group or alkoxy group, R¹ and R² represent each independently a hydrogen atom, alkyl group or alkoxy group, and R³ represents an amino group or hydroxyl group.).