Process for the preparation of water-soluble dyestuffs with a lo

Details Process for the preparation of water-soluble dyestuffs with a lo Process for the preparation of water-soluble dyestuffs with a lo

1981-04-15

1982-07-20

Clingman, A. Lionel

Bleaching and dyeing; fluid treatment and chemical modification

Inorganic additive for dye composition, dye composition...

Ammonium salt

8524, 260208, C09B 6754

Patent

active

043403891

ABSTRACT:
Process for the preparation of water-soluble dyestuffs with a low salt content, characterized in that the water-soluble dyestuffs are salted out from their aqueous solutions and/or dispersions by adding salts which are volatile at temperatures of about 40.degree. C. to about 250.degree. C. under a pressure of about 10 mm Hg to about 760 mm Hg, the dyestuffs are isolated and the volatile salts are volatilized during the drying process.

REFERENCES:
patent: 1889491 (1932-11-01), Philippe
patent: 2590847 (1952-04-01), Dalton et al.
patent: 2814614 (1957-11-01), Zickendraht
patent: 3770371 (1973-11-01), Bossard et al.
patent: 4263197 (1981-04-01), Lienhard

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