Method for improving the fastness of dyeings with basic dyes on cellulosic substrates

摘要

The fastness properties of basic dyeings on cellulosic substrates are improved by treating the substrate with a fixing agent comprising a precondensate or mixture ofPP(A) the reaction product of an amine with cyanamide, dicyandiamide, guanidine or biguanidine, or, PP(B) a quaternary polyalkylene polyamine withP P(C) formaldehyde and/or,P P(D) an N-methylol compound optionally together withPP (E) a catalyst, e.g. MgCl.sub.2. PPThe fixing agents are normally applied as an aftertreatment, with a subsequent heat-curing step.