Modification of cotton to improve its dyeability. Part 3 – polyamide–epichlorohydrin resins and their ethylenediamine reaction products

The effect of pretreating cotton with a polyamide–epichlorohydrin resin and ethylenediamine is described. The treated substrate has enhanced substantivity for reactive dyes, which may be applied without electrolyte simply by setting the dyebath to pH 5 and raising the temperature to the boil. Dyed samples exhibit good brightness and very high wash fastness, but in many cases the light fastness is impaired.