Interaction of oxidative-bleach containing detergents with dyes.Part 3: preparation and resistance of mixed azo/hydrazo dyes derived from l-aminonaphthalene-8-hydroxynaphthalene-3,6-disulp onic acid (H-acid) to oxidative-bleach containing detergents

摘要

The world's largest selling reactive dye,CI Reactive Black 5,provides a universally recognized economic route to heavy navy and black shades in the dyeing of cellulosic substrates with reactive dyes.However,the introduction of ever more powerful domestic detergents has highlighted the instability of this,and many other dyes,to modern activated-bleach containing detergents: these cause a loss of colour on dyed textile substrates by chemical destruction of the chromphore.In this communication we describe approaches to the design,synthesis and evaluation of analogues of CI Reactive Black 5 with superior resistance to oxidative-bleach fading.