Process for the reoxidation of dyeings made with sulfur dyestuff

Details Process for the reoxidation of dyeings made with sulfur dyestuff Process for the reoxidation of dyeings made with sulfur dyestuff

1984-03-29

1984-12-18

Clingman, A. Lionel

Bleaching and dyeing; fluid treatment and chemical modification

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

Sulfur dye or vat dye

8593, 8918, C09B 4900, D06P 506, D06P 130

Patent

active

044888805

ABSTRACT:
The reoxidation of sulfur dyestuffs in an acid medium is associated with disadvantages, such as pollution of the environment, the risk of corrosion on equipment etc. Admittedly oxidation in an alkaline medium does not have these disadvantages, but it is, in turn, more difficult to control (dependence on pH and constancy of color shade).
These difficulties are eliminated in accordance with the invention if the textile material containing cellulose fibers which has the sulfur dyestuffs in the reduced form applied and fixed thereto is subjected to the oxidative action of sodium benzenesulfochloroamide or p-toluenesulfochloroamide under alkaline conditions in order to develop the dyestuff. This can be carried out either continuously or discontinuously.

REFERENCES:
patent: 3716325 (1973-02-01), Aspland
patent: 3944382 (1976-03-01), Doerr
patent: 4011042 (1977-03-01), Stitzel
patent: 4012192 (1977-03-01), Doerr
patent: 4036586 (1977-07-01), Rowe
patent: 4131423 (1978-12-01), Kato
patent: 4310332 (1982-01-01), Curzons
patent: 4321054 (1982-03-01), Davis et al.
patent: 4371373 (1983-02-01), Balland
patent: 4394129 (1983-07-01), Springer
patent: 4397649 (1983-08-01), Springer

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