Dry leuco sulphur dyes in particulate form

Details Dry leuco sulphur dyes in particulate form Dry leuco sulphur dyes in particulate form

1993-11-22

1997-03-18

Einsmann, Margaret

Bleaching and dyeing; fluid treatment and chemical modification

Dry dye composition other than mere mixture of two or more...

8526, 8607, 8611, 8608, 8650, 8651, 8652, C09B 6702, C09B 4900

Patent

active

056118180

ABSTRACT:
By reducing a sulphur dye (S) in aqueous medium with a reducing carbonyl compound in the presence of alkali metal hydroxide and optionally alkali metal (bi)sulphite at temperatures above 60.degree. C. and drying the reaction mixture, there are obtained very stable leuco sulphur dyes (L), which are practically free of sulphides and polysulphides, are readily and completely soluble in water and are usable for the dyeing of substrates dyeable with sulphur dyes, by which a disturbing development of H.sub.2 S or a disturbing inorganic sulphide occurrance in the waste water can be efficiently avoided; by spray-drying in a drying time <4 minutes as described there are obtained sulphide-free, stable leuco sulphur dyes (L) readily soluble in water and particularly suitable for sulphide-free dyeing, in particular for the dyeing of polyamidic fibrous substrates, especially of wool.

REFERENCES:
patent: 1095237 (1914-05-01), Schmidt et al.
patent: 1141148 (1915-06-01), Schmidt et al.
patent: 2122113 (1938-06-01), Ratti
patent: 2228465 (1941-01-01), Laughlin
patent: 3993437 (1976-11-01), Dickmanns et al.
patent: 4213900 (1980-07-01), Daubach et al.
patent: 4252533 (1981-02-01), Heid et al.
patent: 4425134 (1984-01-01), Bruttel et al.
patent: 4917706 (1990-04-01), Meszaros
patent: 4950306 (1990-08-01), Meszaros
patent: 4992078 (1991-02-01), Meszaros
patent: 5030244 (1991-07-01), Neumann et al.
patent: 5030248 (1991-07-01), Meszaros
patent: 5053078 (1991-10-01), Koike et al.
Trotman, Dyeing and Chemical Technology of Textile Fibers, 1984, p. 404 No month available.

Affiliated with

Also associated with

Rating

Dry leuco sulphur dyes in particulate form does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Dry leuco sulphur dyes in particulate form, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dry leuco sulphur dyes in particulate form will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1702496