NON METAL TANNING

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 formula (I), R-NH-Y-SO2-Z, wherein R signifies a radical of formula (Ia), (Ib) (Ic), (Id), or (Ie), wherein 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, ß-chloroethyl, ß-phosphatoethyl or ß-sulphatoethyl R1 signifies hydrogen or CI, in a tanning bath, the tanning bath having a pH of from 6 to 10 at the beginning of tanning step.