Bisazo compound and method for dyeing or printing fibrous materials using the same

摘要

A bisazo compound represented by the following general formula (I) or its salt is a useful fiber-reactive dye: <IMAGE> (I) <IMAGE> where D is a phenyl or naphthyl group; B is a phenylene group, etc.; U is an aliphatic or aromatic linking group; Z is a vinyl group, etc.; and X and Y are a halogen atom, a pyridinio group, etc.