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US 2006/0137101 A1Published application
Process for making wet-pink leather
AssigneeCouncil of Scientific and Industrial Research
InventorsMurugan Chandrabose, Nishtar Fathima, Kalarical Sreeram, Jonnalagadda Rao, Balachandran Nair, Thirumalachari Ramasami
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Abstract
A process of combination tannage is disclosed whereby Zirconium salt is complexed with THP salt to produce wet pink leather without using any conventional dye. The resulting leathers exhibit shrinkage temperature of more than 100° C. properties and other comparable to those of conventionally processed leathers.
Claims11
A process for making wet-pink leather, said process comprising steps of:
- i) providing pickled skins/hides treated with 0.5-3% w/w of Tetrakis hydroxymethyl phosphonium salts (THP Salt) in the presence of an 20-100% w/v of aqueous solution of common salt at a predetermined pH for a predetermined time-period, and
- ii) treating the skins/hides, as obtained in step(i), with 5-10% w/w of zirconium salt and 1-3% w/w of organic ligand under dynamic condition for a period of not less than 1 hr followed by adjusting pH at a predetermined value by conventional method to produce wet pink leather.
Dependencies are inferred from the claim text.