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US 12,252,752 B2Granted
Process for tanning leathers, pre-tanning products and use thereof
AssigneeSilvateam S.P.A.
InventorsEric Poles, Lorenzo Tribuzio, Samuele Giovando
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AssigneeSilvateam S.P.A.
InventorsEric Poles, Lorenzo Tribuzio, Samuele Giovando
Estimating the term…
A process for tanning leathers including a pre-tanning step and a tanning step is provided. In the pre-tanning step leathers are treated with a cationic active agent including a quaternized ester of a fatty acid and triethanolamine, or mixtures thereof and, subsequently, with an anionic active agent including tannins vegetable extracts and a natural or synthetic dispersant selected from the group consisting of lignosulfonates, distillation stillages, sulfonated disulfonic polymers, sulfonated naphthalene polymers or mixtures thereof, to obtain leathers with a shrinkage temperature of at least 65° C. The pre-tanning and tanning steps do not include treatment with aldehydes or aldehyde donor compounds and/or with metal salts.
A process for tanning leathers, the process comprising a pre-tanning step and a tanning step, wherein in the pre-tanning step the leathers are treated with a cationic active agent comprising a quaternized ester of a fatty acid and of triethanolamine, or mixtures thereof and, subsequently, with an anionic active agent comprising tannins vegetable extracts and a natural or synthetic dispersant selected from the group consisting of lignosulfonates, distillation stillages, sulfonated disulfonic polymers, sulfonated naphthalene polymers or mixtures thereof, to obtain leathers with a shrinkage temperature of at least 65° C., and wherein said pre-tanning and tanning steps do not include a treatment with aldehydes or aldehyde donor compounds and/or with metal salts.
Dependencies are inferred from the claim text.