Methods for tanning animal skins with dialdehydes
AssigneeDb Patents Ltd.
InventorRamon Colomer Duran
Life of this patent
Estimating the term…
Abstract
A method for tanning an animal skin may include: (a) putting the skin in contact with a first tanning bath including at least one dialdehyde of general formula O═CH—(CH2)n—HC═O, wherein n is 0 or an integer number greater than or equal to 1 and less than or equal to 8, and wherein the first tanning bath has a pH greater than or equal to 1 and less than or equal to 5; (b) bringing the pH of the first tanning bath to a pH greater than 5 and less than 8; and/or (c) repeating one or more times the steps (a) and (b) on the skin coming from the step (b) using a second or further tanning bath. In the first, second, and further tanning baths, surfactants may be present in a total quantity less than 0.05% by weight relative to a pelt weight of the skin.
Claims20
A method for tanning an animal skin, the method comprising:
- (a) putting the animal skin in contact with a first tanning bath, wherein prior to contact with the animal skin, the first tanning bath comprises at least one dialdehyde of general formula (I)
- O═CH—(CH2)n—HC═O (I),
- wherein n is 0 or an integer number greater than or equal to 1 and less than or equal to 8, and
- wherein the first tanning bath has a pH greater than or equal to 1 and less than or equal to 5;
- (b) bringing the pH of the first tanning bath to a pH greater than 5 and less than 8;
- (c) removing the animal skin in its entirety from contact with the first tanning bath;
- (d) putting the animal skin in contact with a second tanning bath, wherein prior to contact with the animal skin, the second tanning bath comprises the at least one dialdehyde of the general formula (I)
- O═CH—(CH2)n—HC—O (I),
- wherein n is 0 or an integer number greater than or equal to 1 and less than or equal to 8, and
- wherein the second tanning bath has a pH greater than or equal to 1 and less than or equal to 5;
- (e) bringing the pH of the second tanning bath to a pH greater than 5 and less than 8;
- and
- (f) removing the animal skin in its entirety from contact with the second tanning bath;
- wherein in the first and second tanning baths, surfactants are present in a total quantity less than 0.05% by weight relative to a pelt weight of the animal skin, and
- wherein the first tanning bath is different from the second tanning bath.
A method for tanning an animal skin, the method comprising:
- (a) putting the animal skin in contact with a first tanning bath, wherein prior to contact with the animal skin, the first tanning bath consists essentially of at least one dialdehyde of general formula (I)
- O═CH—(CH2)n—HC═O (I),
- wherein n is 0 or an integer number greater than or equal to 1 and less than or equal to 8, and
- wherein the first tanning bath has a pH greater than or equal to 1 and less than or equal to 5;
- (b) bringing the pH of the first tanning bath to a pH greater than 5 and less than 8;
- (c) removing the animal skin in its entirety from contact with the first tanning bath;
- (d) putting the animal skin in contact with a second tanning bath, wherein prior to contact with the animal skin, the second tanning bath consists essentially of the at least one dialdehyde of the general formula (I)
- O═CH—(CH2)n—HC═O (I),
- wherein n is 0 or an integer number greater than or equal to 1 and less than or equal to 8, and
- wherein the second tanning bath has a pH greater than or equal to 1 and less than or equal to 5;
- (e) bringing the pH of the second tanning bath to a pH greater than 5 and less than 8;
- and
- (f) removing the animal skin in its entirety from contact with the second tanning bath;
- wherein in the first and second tanning baths, surfactants are present in a total quantity less than 0.05% by weight relative to a pelt weight of the animal skin, and
- wherein the first tanning bath is different from the second tanning bath.
Dependencies are inferred from the claim text.