A process for the production of tanned leather, skins or pelts by non-metal tanning

Abstract

Tanned leather, skin or pelt is produced by non-metal tanning, comprising the step oftanning 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, C1-8-alkyl, C1-4-alkylcarbonyl, C1-4-alkyl-su|phpnyl or a radical of formula (la), of (lb) -(-C2-3aikylene-O-)q*H (lb) R signifies hydrogen or chlorine, q is 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.