Non-metal tanning process

摘要

Tanned leather, skin or pelt is produced 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 a formula (I),;
wherein X signifies fluorine or chlorine, and/or (+NR3)0-1, wherein R is a substituted or unsubstituted C1 to C6 alkyl group, a substituted or unsubstituted C6 to C10 aryl or a C5 to C6 heteroaryl group, R1 signifies hydrogen, C1-8-alkyl or an alkyleneoxy radical of a formula (Ia), —(—C2-3 alkylene-O—)q—H (Ia), R2 signifies hydrogen, hydroxyl, C1-4-alkyl or C1-4-alkoxy, m, signifies 1 or 2, n signifies 0 to 2, q is of from 1 to 10, 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 tanning step, wherein the bated hide or skin or pelt is subjected to tanning with (A) without previous pickling.

主权项

1. A process for the production of tanned leather, skin or pelt 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
X is fluorine or chlorine (+NR3)0-1 or a combination thereof, wherein R is a substituted C1 to C6 alkyl group, an unsubstituted C1 to C6 alkyl group, an unsubstituted C6 to C10 aryl group, a substituted C6 to C10 aryl group or a C5 to C6 heteroaryl group. R1 is hydrogen, C1-8-alkyl or an alkyleneoxy radical of formula (Ia),
—(—C2-3alkylene-O—)q—H  (Ia) R2 is hydrogen, hydroxy, C1-4-alkyl or C1-4-alkoxy, m is 1 or 2, n is 0 to 2, q is of from 1 to 10, M is hydrogen, 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 tanning step, wherein the bated hide or skin or pelt is subjected to tanning with (A) without previous pickling.