Water soluble monoazo dyes for nylon

Abstract

Water-soluble monoazo dyes for nylon having the formula: ##STR1## wherein ring A may optionally be substituted by halogen, trifluoromethyl, alkoxy, acylamino or alkyl having from 1 to 4 carbon atoms, R represents hydrogen or unbranched alkyl having from 1 to 4 carbon atoms, R.sup.1 represents hydrogen, alkyl or hydroxyalkyl, X represents unbranched alkyl having from 1 to 6 carbon atoms, cycloalkyl, halogen, nitro, trifluoromethyl, sulpho, vinylsulphonyl, hydroxyethylsulphonyl, sulphatoethylsulphonyl, --SO.sub.2 NHR.sup.2, wherein R.sup.2 represents hydrogen or alkyl having from 1 to 4 carbon atoms, or --COOR.sup.3 wherein R.sup.3 represents hydrogen, alkyl having from 1 to 7 carbon atoms, cycloalkyl or aryl, and n represents an integer of from 0 to 3. The dyes are suitable for application to polyamide textile materials. They give a high degree of thermal stability and fastness to wet treatments and to light.

Dependencies are inferred from the claim text.