Masking product for a chromium-sulphate-based tanning agent,...

Details Masking product for a chromium-sulphate-based tanning agent,... Masking product for a chromium-sulphate-based tanning agent,...

C - Chemistry, Metallurgy

14

C

C14C 3/06 (2006.01)

Patent

CA 2193368

Masking product for a chromium sulphate-based tanning agent ensuring the delayed association of chromium ions in solution to promote their absorption into the materials to be tanned. Said product comprises a mixture of alkaline formate and alkaline sulphite reacting synergically to ensure that the chromium sets almost completely and irreversibly on the skins. The invention is characterized by almost complete burnup of the tanning baths and a subsequent low salting out rate.

L'invention concerne un produit de masquage pour agent de tannage à base de sulfate de chrome, destiné à retarder la combinaison des ions chrome en solution en vue de favoriser leur pénétration dans des matières à tanner. Ce produit comprend un mélange de formiate alcalin et de sulfite alcalin qui réagissent en synergie pour assurer une fixation quasi-totale et irréversible du chrome sur les peaux. On constate un épuisement quasi-total des bains de tannage et un relargage très faible lors des opérations ultérieures.

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