Chrome-tanning

Details Chrome-tanning Chrome-tanning

1978-08-23

1980-07-08

Griffin, Ronald W.

Bleaching and dyeing; fluid treatment and chemical modification

Treatment of hides, skins, feathers and animal tissues

Tanning

8 9427, 252 857, C14C 306, C14C 900

Patent

active

042115299

ABSTRACT:
In the chrome-tanning of animal skins and hides by pretanning the pickled pelts with chromium (III) salts, followed by full tanning with chromium (III) salts and acid-binding agents, the improvement which comprises effecting full tanning with the reaction of product at least one of formic acid and a formate with a basic chromium (III) sulphate, at least 2 moles of formate plus formic acid being used per mole of Cr.sub.2 O.sub.3 in the chrome-tanning agent used for full tanning, the total input of chromium oxide being from about 1.0 to 1.8%, based on the weight of the pelts, and tanning being carried out with a liquor volume of at most 100%, based on the weight of the pelts, up to a final pH-value of at least 4.0.

REFERENCES:
patent: 3174817 (1965-03-01), Spahrkas et al.
patent: 3346323 (1967-10-01), Spahrkas et al.
patent: 3656881 (1972-04-01), Hemwall
patent: 4042321 (1977-08-01), Backer et al.
patent: 4101271 (1978-07-01), Bockelman et al.
patent: 4126413 (1978-11-01), Traubel et al.

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