| 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: <IMAGE> (1) 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): <IMAGE> (a) wherein R2 is a hydrogen atom, a methyl group, a methoxyl group or an ethoxyl group and R3 is a methyl, methoxyl or ethoxyl group, R1 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 R2s are hydrogen atoms and both R3s are methoxyl groups, Y and Z may be the same.
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