Azoic dyeing of leather

Details Azoic dyeing of leather Azoic dyeing of leather

1973-05-15

1976-01-20

Sebastian, Leland A.

Bleaching and dyeing; fluid treatment and chemical modification

Treatment of hides, skins, feathers and animal tissues

Tanning

8 12, 8 125, 96 13, 96 91R, 428151, 428473, D06P 312, D06P 332, D06P 500, G03C 152

Patent

active

039334236

ABSTRACT:
Dry leather is dyed with azoic dyes without wetting the leather with water by incorporating into the leather the required diazonium component and any required coupling component in a substantially non-aqueous volatile low-viscosity solvent and incorporating into the leather any other materials required for the coupling reaction in such a solvent or as a vapor. The coupling component can be a natural or synthetic phenolic tanning agent employed in tanning the leather. Dye patterns can be applied to the surface of the leather by using a light-sensitive diazonium component and photo-imaging the surface before effecting coupling. Dry leather is dyed by such processes without significant change in properties.

REFERENCES:
patent: 641394 (1900-01-01), Kauschke
patent: 2405165 (1946-08-01), Pepper
patent: 2541178 (1951-02-01), Slifkin
patent: 2616803 (1952-11-01), Ravich
patent: 2913301 (1959-11-01), Streck
patent: 2967751 (1961-01-01), Streck
patent: 3409384 (1968-11-01), Streck
patent: 3414366 (1968-12-01), Nordstrom et al.
patent: 3472605 (1969-10-01), Wicki et al.

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