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US 7,252,687 B2Granted
Process for making wet-pink leather
AssigneeCouncil of Scientific and Industrial Research
InventorsMurugan Chandrabose, Nishtar Nishad Fathima, Kalarical Janardhanan Sreeram, Jonnalagadda Raghava Rao, Balachandran Unni 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 a shrinkage temperature of more than 100° C., and other properties comparable to those of conventionally processed leathers.
Claims9
A process for making wet-pink leather, said process comprising the steps of:
- i) treating pickled skins and/or hides in a bath comprising 0.5-3% w/w of one or more Tetrakis hydroxymethyl phosphonium salts and a 20-100% w/v aqueous solution of common salt at a pH in the range of 2.5 to 3.0 for 0.5 to 3 hours, and
- ii) further treating the skins and/or hides, as obtained in step(i), by adding 5-10% w/w of zirconium salt and 1-3% w/w of organic ligand to the bath, and treating said skins for a period of not less than 1 hour, followed by adjusting the pH of the bath to 4.8 to 5 to produce wet pink leather.
Dependencies are inferred from the claim text.