TRISAZO COMPOUND FOR BLACK COLOR, DYE COMPOSITION CONTAINING THE SAME, AND USAGE FOR THE SAME

摘要

PROBLEM TO BE SOLVED: To provide an excellent azo dye compound for a black color which can be produced without using dianisidine of a first category of a specified chemical substance, has adequate dyeing properties and light resistance and is used for paper and pulp.SOLUTION: There is provided a trisazo compound represented by a formula (1) or a salt thereof. The trisazo compound is obtained by azocoupling a monoazo compound synthesized from 1-amino-8-(4-methylphenylsulfonyloxy)naphthalene-3,6-disulfonic acid with a monoazo compound synthesized from 4-amino-5-hydroxynaphthalene-1,7-disulfonic acid. In the formula (1), A represents 7-sulfoxynaphthaleneazo-1-yl or 4-carboxybenzeneazenyl substituent.SELECTED DRAWING: None