Method of Dyeing or Printing Cellulosic Fibre Materials With Vattable Dyes

Abstract

A method of dyeing or printing cellulosic fibre materials wherein the fibre material is brought into contact with at least one vattable dye and at least one quinoid compound in an aqueous composition at a pH of less than 12 (electrochemical methods being excluded) yields level and tinctorially strong dyeings.

1 . A method of dyeing or printing cellulosic fibre materials, wherein the fibre material is brought into contact with at least one vattable dye and at least one quinoid compound in an aqueous composition at a pH of less than 12, electrochemical methods being excluded.  
     
     
         2 . A method according to  claim 1 , wherein an anthraquinone containing sulfonic acid groups is used as quinoid compound.  
     
     
         3 . A method according to  claim 1 , wherein anthraquinone-1-sulfonic acid, anthraquinone-2-sulfonic acid, anthraquinone-1,5-disulfonic acid or anthraquinone-2,6-disulfonic acid is used as quinoid compound.  
     
     
         4 . A method according to  claim 1 , wherein cellulosic fibre materials are dyed in an aqueous liquor.  
     
     
         5 . A method according to  claim 4 , wherein the pH is from 11.2 to 11.8.  
     
     
         6 . A method according to  claim 5 , wherein sodium carbonate is used as alkali.  
     
     
         7 . A method according to  claim 6 , wherein sodium carbonate is used in an amount of from 10 to 20 g/l, based on the liquor.  
     
     
         8 . A method according to  claim 1 , wherein the dye is applied by the pad-dyeing method.  
     
     
         9 . A method according to  claim 1 , wherein the dyeing process is carried out continuously in a plurality of passes.  
     
     
         10 . A method according to  claim 1 , wherein the dyeing process is carried out on a hank dyeing machine or an open-width dyeing machine.