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US 11,873,536 B2Granted
Environmentally friendly process for tanning hides
AssigneeBeken Italia S.R.L.
InventorMirko Negretto
Life of this patent
Estimating the term…
Abstract
The present invention relates to a process for the tanning of animal hides characterised, compared to currently adopted processes, by the non-adoption of the step known in the industry as “pickling”. The invention also concerned hides tanned by said process.
Claims14
A process for the tanning of hides which includes the steps of soaking, liming, deliming, maceration, preparation for tanning, and tanning, characterized in that in the step of preparation for the tanning the hides are treated with a liquid mixture consisting of
- water in an amount between 40 and 60% by weight with respect to the weight of the hide;
- between 0.5 and 2.5% by weight with respect to the weight of the hide of an emulsion containing between 45 and 60% by weight of water and between 40 and 55% by weight of an oil consisting of sulphonates of general formula R—SO3H, wherein R is a C4-C20 alkyl radical;
- between 0.2 and 1.5% by weight with respect to the weight of the hide of a mixture of C4-C6 dicarboxylic acids containing between 10 and 30% by weight of succinic acid, between 40 and 60% by weight of glutaric acid and between 15 and 35% by weight of adipic acid;
- a salt selected from sodium acetate and sodium formate in an amount between 1 and 2% by weight with respect to the weight of the hide:
- and optionally an antibacterial component.
2 more elements
Dependencies are inferred from the claim text.