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

Abstract

A process for the production of 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 formula (I),wherein R signifies a radical of formulawherein Hal signifies fluorine or chlorine, X signifies N or CR1, Y signifies an aliphatic, araliphatic or aromatic hydrocarbonic bridge which may optionally be interrupted by a heteroatom or heteroatomic group, Z signifies vinyl, B. -chloroethyl, B-phOsphatoethyl or B-sulphatoethyl R1 signifies hydrogen or Cl,In a tanning bath, the tanning bath having a pH of from 6 to 10 at the beginning of tanning step.