Leather dyeing agents and their preparation: membrame separation

Details Leather dyeing agents and their preparation: membrame separation Leather dyeing agents and their preparation: membrame separation

1981-09-21

1983-09-06

Clingman, A. Lionel

Bleaching and dyeing; fluid treatment and chemical modification

Dyeing involving animal-derived natural fiber material ,...

Leather dyeing

8437, 8440, 8543, 8661, 8676, 8680, 8687, C09B 6754, D06P 332

Patent

active

044027010

ABSTRACT:
Leather dyeing agents, which can be obtained by concentrating, by means of a membrane separation process, the mother liquors, which are produced in the salting-out process in the preparation of organic dyestuffs which are water-soluble or which contain groups imparting water-solubility, the mother liquors having an extinction in the absorption maximum which is .gtoreq.500, with a layer thickness of 10 cm, and by drying the concentrate, if appropriate.

REFERENCES:
patent: 3989452 (1976-11-01), Hugelshofer
patent: 4179267 (1979-12-01), Lacroix et al.
patent: 4328220 (1982-05-01), Abel et al.

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