Patent GB-242393-A (GB)
Title: Improvements relating to the dyeing, printing or stencilling of cellulose acetate
IPC: D06P3/42
Filed: 1924-09-19
Abstract: Insoluble or difficultly-soluble dyestuffs, such as those specified in the parent Specification and in Specifications 224,681, 227,183, and 237,943, are solubilized by treatment as in the parent Specification with sulpho aromatic acids, for example sulpho benzene stearic acid or derivatives thereof, such as sulpho phenol stearic acid, or sulpho naphthalene stearic acid, or salts of such acid. Examples show the heating of a number of dyestuffs with sulpho naphthalene or benzene oleic acid or the sodium salt. Specification 224,925 also is referred to.ALSO:Insoluble or difficulty soluble dyestuffs, such as those specified in the parent Specification and in Specifications 224,681, 227,183 and 237,943, are solubilized by treatment with sulpho-aromatic fatty acids, for example, sulphobenzene stearic acid, or their derivatives such as sulphophenol stearic acid or sulphonaphthalene stearic acid or salts of such acids.  In examples, aqueous pastes of p-nitrobenzeneazo-diphenylamine, p-dimethylaminophenyl-1 : 4-naphthoquinonemonoimide, 1-monomethylamino-4-p-tolylaminoanthraquinone, Malachite Green base, 4-chlor-2-nitrophenyl-41-tolylamine, benzeneazophenylmethylpyrazolone, and aminoazobenzene base are stirred and heated with sulpho benzene or naphthalene oleic acid or their sodium salts.  Specification 224,925 also is referred to. Sulpho-aromatic fatty acids.-In examples of the preparation of the solubilizing agents, naphthalene or benzene is heated to 80 DEG  C. with oleic acid (under a reflux in the case of benzene), the mass cooled and stirred at below 40 DEG  C. with 20 per cent oleum and the temperature then raised to 100 DEG  C. for 3 hours.  The mixture is poured into water, treated with salt, and the oil separated and washed with brine.  The product may be neutralized or made alkaline with caustic soda.  4-Chlor-2-nitrophenyl-41-tolylamine, referred to above, is prepared by condensing p-toluene with 2.5-dichlornitrobenzene.ALSO:In the process of the parent Specification for dyeing, printing or stencilling cellulose acetate goods (yarns, threads, filaments, fabrics, films &c.) by means of insoluble or difficultly-soluble dyes which have been previously solubilized, instead of the solubilizing agents therein described sulpho aromatic fatty acids, such as sulpho benzene stearic acid, or derivatives thereof such as sulpho phenol stearic acid or sulpho naphthalene stearic acid, or salts of these acids are employed.  In addition to the dyestuffs or components (base or developer) described in the parent Specification, those specified in Specifications 224,681, 227,183 and 237,943 or other insoluble or relatively insoluble dyestuffs or compounds may be used.  In examples of the preparation of the solubilizing agents, naphthalene or benzene is heated to 80 DEG  C. with oleic acid (under a reflux in the case of benzene), the mass cooled and stirred at below 40 DEG  C. with 20 per cent oleum and the temperature then raised to 100 DEG  for 3 hours. The mixture is poured into water, treated with salt, and the oil separated and washed with brine.  The product may be neutralized or made alkaline with caustic soda.  In examples of dyeing, an orange is obtained on cellulose acetate yarns by treatment in a bath prepared from the mixture, resulting from stirring and heating the sulpho naphthalene oleic acid with a finely ground aqueous paste of p-nitrobenzene-azo-diphenylamine; reddish-blue on a woven fabric by employing a paste of p-dimethylaminophenyl-1 : 4-naphthoquinonemonoimide and the sodium salt of the sulpho naphthalene oleic acid; a sky-blue on a woven fabric by employing a paste of 1-monomethylamino-4- p - tolylaminoanthraquinone and sulpho benzene oleic acid; a bluish-green on yarns with Malachite Green base and sulpho benzene oleic acid; yellow on the cellulose acetate and blue on the wool of a mixed knitted fabric by treatment in a bath containing Alizarin Delphinol B and the product obtained by stirring and heating a paste of 4-chlor-2-nitrophenyl-41-tolylamine with sulpho naphthalene oleic acid and common salt; and a lemon-yellow on a woven fabric by employing benzeneazo-phenylmethylpyrazolone and sulpho benzene oleic acid, the dye-bath also containing acetic acid. A further example shows the production of a scarlet-red on a fabric by treatment in a bath containing the product from aminoazobenzene p base and sulpho naphthalene oleic acid and acetic acid and subsequent diazotization and development with sodium b -naphtholate.  In an example of printing a woven fabric a p-nitrobenzene-azo-diphenylamine and sulphonaphthalene oleic acid preparation is made up with gum arabic and corn starch to produce a printing paste giving orange shades.  Specification 224,925 also is referred to.