Bleaching and dyeing; fluid treatment and chemical modification – Treatment of hides – skins – feathers and animal tissues – Tanning
Patent
1984-06-07
1985-12-24
Willis, Prince E.
Bleaching and dyeing; fluid treatment and chemical modification
Treatment of hides, skins, feathers and animal tissues
Tanning
8 9424, 8 9425, C14C 500
Patent
active
045603847
ABSTRACT:
A process for tanning hides for soles or insoles with ammonium titanyl sulphate. The hides, subjected to soaking, liming, fleshing, and deliming, are first treated with ammonium sulphate. Successively, ammonium titanyl sulphate as well as citric acid or an alkali metal citrate are gradually added to the bath, while maintaining the temperature of the bath at a value not exceeding 37.degree. C. and a pH at values ranging from 1.7 to 2.5. After each addition, the hides are treated until they have absorbed at least 90% of the soluble Ti (IV). Sodium sulphite and hexamethylenetetramine are then gradually added: this addition is such as to bring the final pH of the bath to 3.8-4.5 and to exhaust the bath in soluble Ti (IV). NaHCO.sub.3 is successively added until a pH value of the bath ranging from 4.0 to 5.0 is reached, such pH being maintained for at least 2 hours. At least one tanning treatment with a tannin, either prior to the treatment with ammonium titanyl sulphate (pretanning), or after the treatment with NaHCO.sub.3 (additional tanning), is carried out, said tanning being accomplished with a synthetic or vegetable tannin in the former case, and with a synthetic tannin in the latter case.
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Roman, A. S. et al. "Stabilization of Solutions of a Titanium Tanning Agent with Organic Acids", Izv. Vyssh. Uchebn. Zaved., Tekhnol. Leck. Prum-Sti, 1974 (5), 31-35.
Derwent Abstract, 27091S-DE., French Patent (2042206-Q), Mar. 26, 1970.
Guidi Loris
Pace Renato C.
Scotti Carlo
Vallini Paolo
Vanni Sergio
Guidi Loris
Sibit S.p.A.
Thompson Willie J.
Willis Prince E.
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