Patent ID: 6326474
Filing Date: 2001-12-04
Classification: C09B

Abstract:
A method for preparing a reactive black dye of formula 1, which comprises the steps of:(a) diazotizing an aminophenyl-.beta.-acetoxyethylsulfone compound of formula 2;(b) neutralizing a 1-naphtol-8-amino-3,6-disulfonic acid compound with acid; and(c) mixing two reaction solutions prepared in the manners as defined in steps (a) and (b) at a temperature ranging from 0 to 5.degree. C. and stirring the mixture with adjusting the pH below 7 through adding acid;wherein said aminophenyl-.beta.-acetoxyethylsulfone compound of formula 2 is chosen from ##STR9##wherein said reactive black dye of formula 1 chosen from ##STR10##wherein M is an alkali metal atom.