Wasserlösliche Azofarbstoffe und diese Farbstoffe enthaltende polarisierende Filme

摘要

Dyes having the specific structural formula (1) set out below, their copper salt dyes, water-soluble azo dyes containing the dyes or the copper salt dyes, and polarizing films containing the water-soluble azo dyes: wherein A means a benzene or naphthalene ring having a sulfone group or a base thereof, Y and Z individually denote a group of the following formula (a): wherein R<2> is a hydrogen atom, a methyl group, a methoxyl group or an ethoxyl group and R<3> is a methyl, methoxyl or ethoxyl group, R<1> represents an amino, C1-4 alkylamino, C2-4 alkylcarboxyamino, benzoylamino or phenylamino group bonded to the 6 or 7 position of the naphthalene ring, and X denotes a hydrogen, sodium, potassium or lithium atom, with the proviso that Y and Z are different but, when both R<2>s are hydrogen atoms and both R<3>s are methoxyl groups, Y and Z may be the same.