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US 7,063,728 B2Granted
Process for making chrome tanned leathers
AssigneeCouncil of Scientific and Industrial Research
InventorsVictor John Sundar, Chellapp Muralidharan
Life of this patent
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Abstract
The present invention provides an improved pickling and bating free process suitable for both hides and skins for making chrome tanned leathers by using a mixture of conventional chrome tanning salt and alkali metal salt is used at a pH in the range of 5–5.5.
Claims5
A tanning process for making chrome tanned leathers, said process comprising the steps of:
- a) conditioning delimed hides or skins to a pH in the range of 5–5.5,
- b) treating the delimed hides or skins with 6–8% w/w, of a mixture of basic chromium sulfate of basicity ranging 30–45% and alkali metal salt of organic acid up to three carbon chain, for a period of at least 2 Hrs, without addition of water,
- c) adjusting pH of the contents of step (b) in the range of 4–4.2 by alkalinizing agent, and
- d) washing the tanned leather with water to obtain chrome tanned leather;
- wherein the process does not include pickling or bating the delimed hides or skins.
2 more elements
Dependencies are inferred from the claim text.