Process for the production of a fiber material and process for the dyeing of the modified fiber material with anionic textile dyes

A process for the modification of a fiber material containing hydroxy or carboxamido groups, or hydroxy and carboxamido groups which comprises exposing the fiber material to a composition consisting essentially of a compound of the formula (1) ##STR24## in which R.sup.A is hydrogen or alkyl of 1 to 3 carbon atoms, unsubstituted or substituted by hydroxy or a group of the formula (2) or (3)

• in which
• R.sup.1 is hydrogen, methyl or ethyl,
• R.sup.2 is hydrogen, methyl or ethyl, and
• R.sup.3 is hydrogen, methyl or ethyl, or
• R.sup.1 and R.sup.2 together with the nitrogen atom are a saturated heterocyclic radical formed by an alkylene of 5 to 8 carbon atoms or by two alkylenes of 1 to 4 carbon atoms and an oxygen or an amino of the formula --NH--, and
• Z.sup.(-) is an anion;
• R.sup.B has one of the meanings given for R.sup.A ;
• W is a direct bond or a group of the formula --CHR.sup.C -- in which R.sup.C has one of the meanings given for R.sup.A ;
• X is a group --O-- or --NH--;
• containing at least one primary, secondary or tertiary amine group or quaternary ammonium group as a substituent to the cyclus or forming a part of said ring, or being both, in an aqueous, alkaline solution at a pH of between 10 and 14 and then fixing the compound of the formula (1) onto said fiber material at a temperature of between 100.degree. and 230.degree. C.