Process and preparation for dyeing cellulosic materials

摘要

The following two dyestuffs are prepared by condensing the sulphochloride of 2-phenyl-4 : 6-dichloro-1 : 3 : 5-triazine with 2 mols. of the appropriate amino-anthraquinones: The following are typical of the dyestuffs prepared by condensing the appropriate amino compound with the appropriate carboxylic acid-sulphochloride: ALSO:Cellulose materials are coloured with vattable, polycyclic quinones in a process wherein at least one stage is carried out in the presence of a reducing agent and wherein the said quinone contains no "reactive" groups but does contain at least one acylamino group, at least 5 condensed rings or at least 2 anthraquinone residues and at least one sulphonic acid group which may be functionally converted and which, in that case, is capable of being hydrolysed in the vat and remains bound to the chromophore through its sulphur atom. Such functionally converted sulphonic acid groups may be sulphonic acid chloride, fluoride or bromide groups. The dyestuffs may belong to a large number of specified vat dyestuff series and as well as the sulphonic acid and acylamino groups may be further substituted with halogen atoms, alkoxy and alkylamino groups and, in certain cases, further hydrophilic, e.g. sulphate, groups. Especially suitable are a -acylamino, particularly a -aroylamino derivatives which contain the sulphonic acid group or the aroyl group. The dyestuffs may be applied to regenerated cellulose or cotton in a printing paste or padding liquor (the pad-roll process being suitable for cotton) or advantageously by the exhaustion method in a bath at about 50 DEG C. which preferably contains neutral salt and an alkali. The reducing agent which may be introduced at any stage of the process may be an alkali metal hydrosulphite, thiourea dioxide or preferably an alkali metal sulphide or hydrosulphide or glucose. Instead of preparing a dyebath the vattable compound, reducing agent and, if desired, neutral salt may be made up into a stiff paste or dry preparation. In the examples a large variety of dyeing, printing and padding processes are described employing a large number of dyestuffs.