Chromium free process for the tanning of hides

Details Chromium free process for the tanning of hides Chromium free process for the tanning of hides

1989-03-09

1990-10-02

Lieberman, Paul

Bleaching and dyeing; fluid treatment and chemical modification

Treatment of hides, skins, feathers and animal tissues

Tanning

8 941R, C14C 302, C14C 304

Patent

active

049604295

ABSTRACT:
A process for the tanning of skins applicable to lamb, goat, calf hides, or skins from other origins. The process is based in the previous modification of the collagen of the skin by covalent reaction with polyfunctional polymers with a high quantity of hydroxylic groups. The modification treatment may be carried out after bated skin or pickled skin has been previously depickled. After binding of the polymer, the reactivity of the skin substrate is modified whereby it will show a higher affinity for titanium salts, for example ammonium titanyl double sulphate, titanyl sulphate or any other soluble titanium compound.

REFERENCES:
patent: 3934975 (1976-01-01), Kelly et al.
patent: 4731089 (1988-03-01), Covington

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