Tanning process and tanning composition

Abstract

Tanned leather, skin or pelt is produced by non-metal tanning, comprising the step of tanning with a tanning agent (A) of formula (I), wherein Hal signifies fluorine or chlorine, R1 signifies hydrogen, C1-8-alkyl or an alkyleneoxy radical of formula (la), R2 signifies C1-4-alkyl or C1-4-alkoxY, m signifies 1 or 2, n signifies 0 or 1, q is of from 1 to 10, M signifies hydrogen or an alkali metal cation or an ammonium cation, in a tanning bath, the tanning bath having a pH of from 6 to 10 at the beginning of tanning step, the invention relates to the defined tanning process, particular tanning agent compositions, the use of the tanned leather, skins or pelts for further processing and the produced tanned and optionally further processed leather, skins or pelts.