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US 12,454,730 B2Granted
Tannery product for oxidative hair removal treatment of animal hides and skins and relative method
AssigneeLeder Chimica SRL
InventorEnrico Zanconato
Life of this patent
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Abstract
A tannery product designed to be introduced into a bath for oxidative hair removal treatment of animal hides and skins includes a perhydrate compound, an alkalizing agent and an activating agent. The treatment bath can be used in a method for oxidative hair removal of animal hides and skins. The method includes introducing the activating agent into the bath in a proportion to the weight of the hide and skin to be treated between 0.0001 and 0.01.
Claims12
A method for the oxidative hair removal of animal hides and skins, the method comprising the following steps in succession:
- (a) providing the hide and skin to be treated;
- (b) providing water in proportion to the weight of the hide and skin to be treated varying between 0.8 and 4 to create a treatment bath containing said hide and skin to be treated, said bath being maintained at a temperature of between 15° C. and 40° C.;
- (c) introducing into said treatment bath a perhydrate compound and at least one alkalizing agent, wherein said perhydrate compound and said at least one alkalizing agent are in a proportion to the weight of the hide and skin to be treated, the proportion varying between 0.0001 and 0.2, wherein a pH of said bath reaches between 9 and 14;
- (c1) mixing said treatment bath for a time up until 30 minutes;
- (c2) introducing in said treatment bath at least one activator in proportion to the weight of the hide and skin to be treated, wherein the proportion is between 0.0001 and 0.01;
- and
- (c3) introducing 30% sodium hydroxide (NaOH) in a proportion to the weight of the hide and skin to be treated, wherein the proportion is between 0 and 0.2;
- and
- (d) mixing said treatment bath containing said hide and skin to be treated for a period up until 48 hours.
6 more elements
Dependencies are inferred from the claim text.