C - Chemistry – Metallurgy – 14 – C
Patent
C - Chemistry, Metallurgy
14
C
8/67
C14C 3/04 (2006.01) C14C 3/28 (2006.01)
Patent
CA 1232708
ABSTRACT OF THE DISCLOSURE This invention provides 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°C and its 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 grad- ually 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). NaHCO3 is successivley added till reaching a pH value of the bath ranging from 4.0 to 5.0, 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 NaHCO3 (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.
456002
Guidi Loris
Pace Renato C.
Scotti Carlo
Vallini Paolo
Vanni Sergio
Guidi Loris
Marks & Clerk
Sibit S.p.a.
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