| abstract |
The wet fastness properties of direct or reactive dyeings on cellulosic substrates are improved by aftertreatment with an agent comprising (A) a linear or crosslinked polymer comprising repeating units containing at least two quaternary nitrogen atoms linked by bridging groups connected to the quaternary nitrogen atoms by alkylene or arylene groups; optionally (B) an N-methylol derivative of a urea, melamine, guanamine, triazinone, urone, carbamate or acid amide; and, as an essential component, (C) a catalyst for the cross-linking of N-methylol compounds of the type (B) above, and subsequently carrying out a heat-curing step. Certain of the quaternary polymers (A), containing melamine groups, are novel. |