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1. WO2012062411 - NON METAL TANNING

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

[ EN ]

Patent Claims

1. A process for the production of tanned leather, skins or pelts by non-metal tanning, comprising the step of tanning a bated hide, skin or pelt with a tanning agent (A), the tanning agent (A) being at least one compound of formula (I),


wherein

Hal signifies chlorine or fluorine,

X signifies N or CR

Y signifies hydrogen, Ci-8-alkyl, C -4-alkyl-carbonyl, C1-4-alkyl-sulphonyl or a radical of formula (la),


or (lb)

- (- C2-3 alkylene - O -)q - H (lb)

R signifies hydrogen or chlorine,

q is 1 to 10

and

M signifies hydrogen or an alkali metal cation or an ammonium cation, the ammonium cation being a protonated tertiary amine or a quaternary ammonium cation,

in a tanning bath, the tanning bath having a pH of from 6 to 10 at the beginning of the tanning step.

2. A tanning process according to Claim 1 , wherein the bated hide or skin or pelt is subjected to tanning with (A) without previous pickling.

3. A process according to Claim 1 , wherein a bated and pickled hide, skin or pelt is depickled to a pH in the range of 6 to 10 before tanning with (A).

4. A process according to any one of Claims 1 to 3, wherein the tanning agent (A) is employed in the form of an aqueous composition (T) free of metal compounds of tanning activity.

5. A process according to Claim 4, wherein the composition (T) is a

composition (T1 ), the composition (T1 ) further comprising a surfactant (B) and/or a buffer (Ci) to keep an acidic to neutral pH.

6. A process according to Claim 5, wherein the composition (T1 ) further comprises an agent (D) to protect against the damaging action of microorganisms and/or a polysaccharide-based thickener (E).

7. A process according to Claim 6, wherein aqueous composition (T-i) comprises (E).

8. A process according to any one of Claims 1 to 7, wherein the tanning bath comprises a buffer (C2) to achieve a nearly neutral to basic pH at the beginning of the tanning step.

9. A process according to any one of Claims 1 to 8 for the production of non-metal tanned leather, skin or pelt, wherein the tanning step with the tanning agent (A) is a pre-tanning, a main tanning or a full tanning or a pretanning and a main tanning.

10. A process according to Claim 9, wherein a non-mineral tanning agent (F), which is different from the tanning agent (A) as defined in claim 1 , is used before, after or together with tanning agent (A) in pre-tanning, in main tanning or in full tanning, or in combination with tanning agent (A) in full tanning.

11. A process according to Claim-10 wherein the non-mineral tanning agent (F) is selected from the group consisting of

(F1 ) a vegetable tanning agent,

(F2) a syntan,

(F3) a synthetic, semisynthetic or natural resin or polymer,

(F4) a tanning natural oil or modified oil,

(F5) a 4,6-dichloro-1 ,3,5-triazin-2-yl-aminobenzene-mono- or di-sulphonic acid salt.

(F6) a tanning oxazolidine,

12. A process according to Claim 9, wherein the substrates are tanned with tanning agent (A) in a main or full tanning and then are subjected to a

complementary tanning with a non-mineral tanning agent (F) as defined in claim 10 or 1.

13. A process according to claims 10, 1 , or 12 wherein the non-mineral tanning agent (F) is employed in a smaller amount compared with the amount of the tanning agent (A).

14. Use of the tanning composition (T1) as defined in claims 5, 6 or 7 as tanning agent (A) in a tanning process as defined in any one of Claims 1 to 13.

15. Use of the tanned leather, skins or pelts produced according to a process as defined in anyone of Claims 1 to 13 for further processing by at least one further treatment selected from the group consisting of

(a) retanning with a non-mineral tanning agent (F) as defined in claims 10 or 11 , which is different from the tanning agent (A) as defined in claim 1 ,

(b) fat-liquoring,

(c) dyeing, and

(d) finishing.

16. Use of the tanned leather, skins or pelts produced according to a process as defined in anyone of Claims 1 to 13 for further processing by a further treatment comprising retanning with a non-mineral tanning agent (F) as defined in claims 10 or 11.

17. Use of the tanned leather, skins or pelts produced according to a process as defined in anyone of Claims 1 to 13 for further processing by a further treatment comprising retanning with non-mineral tanning agent (F) as defined in claims 10 or 11 , fat-liquoring and optionally dyeing and/or finishing.

18. Tanned leather, skins or pelts obtainable by a process according to any one of Claims 1 to 13.