High light fastness reactive red dyes

摘要

The present invention refers to dyestuffs of the formula (I) wherein R¹ is H or (C₁-C₄)-alkyl; R² is H or (C₁-C₄)-alkyl; each of X¹ and X², independently, is a labile atom or group; and M is H, an alkali metal, an ammonium ion or the equivalent of an alkaline earth metal, wherein compounds wherein R¹ and R² are H are excluded, mixtures of the dyestuffs of the formula (I) with dyestuffs of the formula (II) wherein each of X³ and X⁴, independently, is a labile atom or group; L is an organic linking group; and M is H, an alkali metal, an ammonium ion or the equivalent of an alkaline earth metal, processes for the preparation of said dyestuffs and said dyestuff mixtures and their use for dyeing and printing hydroxy- and/or carboxamido-containing fiber materials.