Azo dye, composition containing the same for anisotropic dye film, anisotropic dye film, and polarizing element

Abstract

To provide a dye capable of forming an anisotropic dye film showing high dichroism and having a high degree of molecular orientation, a composition containing the dye, an anisotropic dye film using the dye and a polarizing element. A trisazo dye, of which the free acid form is represented by the following formula (1), wherein at least one of B1 and D1 has at least one substituent as defined by the following Q1, a dye composition for an anisotropic dye film containing the dye, an anisotropic dye film and a polarizing element using the anisotropic dye film: Q1: an alkyl group or alkoxy group substituted by a hydrogen bond-forming group: wherein A1 is a phenyl group or a naphthyl group, each of B1 and D1 is a phenylene group or a naphthylene group, X1 is an amino group which may be substituted or a hydroxyl group, and m is 0 or 1.

Dependencies are inferred from the claim text.