Process for preparing fast dyeings and prints on cellulose fiber materials and their mixtures with synthetic fibers
AssigneeHoechst Aktiengesellschaft
InventorFriedrich Reinhardt
Life of this patent
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Abstract
Fast colorations can be obtained on cellulose materials with disperse dyestuffs containing ester groups when heat-fixation occurs in the presence of aliphatic alcohols, amines or aminoalcohols. Probably a transesterification and/or amide formation leading to significantly higher molecular weight of the dyestuffs are responsible for the good fastness properties of the colorations.
Claims18
A process for producing fast colorations on a cellulose material which comprises contacting said materials with an aqueous preparation of a disperse dyestuff containing one or more esterified carboxylic acid groups and fixing the coloration by steaming and/or dry heat in the presence of a compound containing more than one hydroxy and/or amino groups linked to aliphatic carbon atoms to cause said compound to transesterify and/or transamidate at least partially the ester group or groups of said dyestuff.
Dependencies are inferred from the claim text.