Economy chrome tanning process with aldehyde-acids and keto-acid

Details Economy chrome tanning process with aldehyde-acids and keto-acid Economy chrome tanning process with aldehyde-acids and keto-acid

1986-05-08

1987-12-29

Lieberman, Paul

Bleaching and dyeing; fluid treatment and chemical modification

Treatment of hides, skins, feathers and animal tissues

Treatment of untanned skins or hides

8 9415, C14C 100

Patent

active

047158611

ABSTRACT:
Economy chrome tanning process wherein the pelts are pretreated before the tanning with 0.1 to 2% of an aldehyde- or keto-acid, preferably with glyoxylic acid or pyruvic acid, and are then tanned by customary methods. In this pretreatment, which is preferably carried out in the pickle, the tanning requires a chromium supply of only 1.25 to 1.5% of Cr.sub.2 O.sub.3 on weight of pelt. Despite this reduced amount of chrome tannin the results obtained are boil-resistant leathers with uniform chromium distribution, excellent color levelness and very good physical properties.

REFERENCES:
Fuchs, K., Haller, S., Lotz, W., AQEIC Bol Tec, 37(6), 195-205.

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