Blue dye with particularly high purity and positive...

Details Blue dye with particularly high purity and positive... Blue dye with particularly high purity and positive...

2003-10-21

2009-11-24

Douyon, Lorna M (Department: 1796)

Bleaching and dyeing; fluid treatment and chemical modification

Dye or potential dye composition, additive, treatment,...

Oxidation dye, e.g., aniline, nitroaniline, etc.

C008S506000, C008S513000, C430S105000, C430S107100, C106S031270, C106S031280

Reexamination Certificate

active

07621967

ABSTRACT:
A dye base sulfate and method of making are described. The dye base sulphate of formula (I) is produced with a residual amine content of less than 2000 ppm, as determined by HPLC, by precipitation of the dye base, made by Friedel-Crafts alkylation, substitution and hydrolysis, as the dye base sulphate is a) taken up in water and subjected to a first steam distillation then filtered and optionally dried at 50 to 180° C., b) the pressed cake is treated with water or the optionally dried dye base sulphate is moistened with water, c) subjected to a further steam distillation and filtration and d) dried at 50 to 180° C.

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