A METHOD OF DYEING A SUBSTRATE WITH A REACTIVE DYESTUFF IN SUPERCRITICAL OR NEAR SUPERCRITICAL CARBON DIOXIDE

摘要

The present invention relates to a method of dyeing a substrate selected from the group consisting of cellulose fibres, modified cellulose fibres, protein fibres, synthetic fibres and combinations thereof, wherein the method comprises contacting the substrate with supercritical or near supercritical carbon dioxide containing a reactive dyestuff of the formula (I): wherein Ch represents a chromophoric residue of an aromatic diazo substance or of an anthraquinone substance; Y represents O or NR, in which R represents hydrogen or a C₁-C₈ alkyl, which is optionally substituted by hydroxy, cyano, chloro, bromo, C₁-C₅ alkoxy, phenoxy, phenyl or phenoxy C₁-C₄-alkoxy; X₁ represents fluorine; X₂ represents fluorine, chlorine, OR₁ or N(R₂)R₃; R₁ represents hydrogen, or a C₁-C₄ alkyl, which is optionally substituted by hydroxy, cyano, fluorine, chlorine or bromine; R₂ and R₃ independent ly represent hydrogen, P(O)(OH)R₄ or a C₁-C₃ alkyl which is optionally subst ituted by hydroxy, cyano, fluorine, chlorine or bromine; and R₄ represents hydroxy, fluorine, chlorine or bromine.