Agent blue dye, with a particularly high purity and a positive triboelectric effect regulation

摘要

Process for the preparation of a compound of formula (1), by an alkylation Friedel-Crafts p-clorobenzotricloruro with chlorobenzene, unasustitución combined chlorine on the aromatic radical by aniline and m-toluidine, hydrolysis alkaline encondiciones to provide dyebase and precipitation in form of labase sulfate dye of formula (1), characterized in that the sulfate based dye) is taken up in water and subjected to a first distillation with steam, to then sefiltra and optionally dried at 50 to 180 ° c, b) the press cake is mixed with water or respectively sulfate based dye, optional drying is slurried with water, c) is subjected to further distillation with steam and another filtration, d) and subjected to drying at 50 to 180 ° C.