Sulphur dyestuffs, a process for their manufacture and their use

Details Sulphur dyestuffs, a process for their manufacture and their use Sulphur dyestuffs, a process for their manufacture and their use

1982-02-18

1983-09-13

Clingman, A. Lionel

Bleaching and dyeing; fluid treatment and chemical modification

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

Sulfur dye or vat dye

8918, 8924, 260134, 544 35, 544 36, C09B 4910, D06P 130

Patent

active

044039956

ABSTRACT:
New sulphur dyestuffs are prepared by reacting sulphur with a 4-hydroxydiphenylamine of the formula ##STR1## wherein R and R.sup.1 denote hydrogen or alkyl having 1 to 4 carbon atoms and the nucleus A has at least one free ortho-position in relation to the imino group, in a first stage at an elevated temperature to form a thiazine compound which is then sulphurized in a second stage in a water-soluble solvent at an elevated temperature to produce the sulphur dyestuff, and wherein a molar ratio of first stage reactants of 1:(2 to 2.4) between the 4-hydroxydiphenylamine compound and sulphur is maintained.

REFERENCES:
patent: 2130416 (1938-09-01), Buchanan
patent: 2415363 (1947-02-01), Mitchell et al.
patent: 2657112 (1953-10-01), Robinson et al.
patent: 2887482 (1959-05-01), Vierlins
patent: 3956332 (1976-05-01), Krusche et al.
Venkataraman's "The Chemistry of Synthetic Dyes", vol. VII, (Academic Press, 1974), pp. 24-25.

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