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) bein£ a sulphogroupcontaining dichloro-diazine selected from compound of formula (I)of formula (II) and mixtures of two or more thereof, wherein R1 signifies hydrogen, methyl, methoxy, benzoyl, naphthoyl,, mono- or di(C1-4-alkyl)-aminocarbonyl, C1-8-alkoxy-carbonyf or oxymono- or ofigo-(C2-3-alkyleneoxy)-carbonyl R2-(SO3M)n signifies a radical of formulaR3 signifies hydrogen, C1-8-alkyl or C1-8alkoxy, m . is 1 or 2, ' h is 1 or 2 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 tanning step.