Disazo compound, reactive dye composition, and method of dyeing cellulose or cellulose-containing fibers

摘要

The present invention provides a disazo compound which in a free acid form is represented by the formula (1) and which has high ability to dye cellulosic fibers and attains efficient dyeing with satisfactory reproducibility; and a method of dyeing cellulosic fibers with the compound. Also provided are: a reactive dye composition comprising a compound represented by the formula (1) and a specific red reactive dye and/or a specific blue reactive dye; and a method of dyeing cellulosic fibers with the composition. In the formula, R₁ and R₃ each represents hydrogen atom or methoxy group; R₂ and R₄ each represents hydrogen atom, methyl group, acetylamino group, ureido group, etc.; and m is 2 or 3.