Dyeing and printing of fibres, films and like shaped articles of linear polyamides

摘要

Linear polyamide fibres, films and other shaped articles are dyed or printed with a dyestuff containing the anion of the formula: in which R represents an alkyl radical (branched or unbranched) containing 7-12 carbon atoms. The dyestuff cation may be a hydrogen, sodium, potassium or ammonium ion or that of an aliphatic, cycloaliphatic, aromatic or heterocyclic amine or that of a quaternary ammonium compound derived from such an amine. The dyestuff is applied from aqueous solutions or dispersions containing, if desired, anionic and non-ionic dispersing agents and thickeners. Dyeing may be effected at temperatures of 60 DEG -120 DEG C., from a bath of pH 3-10, advantageously an initially alkaline bath rendered acid during the final phase of dyeing, or alternatively the dye liquor may be padded on the fibres which are subsequently steamed. The printing pastes may contain the usual auxiliaries, several of which are specified. Examples of dyeing and printing are given. The dyestuffs are prepared by reacting primary alkylamines containing 7-12 carbon atoms with 1-amino-4-haloanthraquinone- 2-sulphonic acids, or with 1-amino- 2:4-dihaloanthraquinones in which latter case the halogen in the 2-position of the product is converted into a sulphonic acid group by reaction with sulphurous acid or a sulphite.