| abstract |
By non-metal tanning, the softened hide, skin or felt is tanned with a tanning agent (A) which is at least one compound of formula (I) in a tanning bath having a pH of 6 to 10 at the beginning of the tanning step, Tanned leather, skins or felts are produced. Formula I In the formula (I) R is a radical of the formula (la), (lb), (lc), (Id) or (Ie). Ia (Ib) Ic Formula Id Ie In Formulas Ia to Ie, Hal is fluorine or chlorine, X is N or CR1, Y is an aliphatic, cycloaliphatic or aromatic hydrocarbon bridge, where heteroatoms or heteroatomic groups may be optionally inserted, Z is vinyl, β-chloroethyl, β-phosphatoethyl or β-sulfatoethyl, R 1 is hydrogen or Cl. |