Patent GB-142448-A (GB)
Title: Manufacture of substantive ortho-oxy-azo-dyestuffs, and their application in dyeing
IPC: C09B45/18
Filed: 1920-03-26
Abstract: Monoazo and primary disazo dyes are obtained by coupling one or two molecular parts of a diazotized o-aminooxyarylsulphonamide of the formula (OH) (NH2) R-SO2NHX (R=aryl or substituted aryl, X=hydrogen or aryl), or one molecular part of such a diazo compound and one molecular part of a aromatic o-oxydiazo compound, with one molecular part of the following derivatives of 2 : 5 : 7-aminonaphthol sulphonic acid:-phenyl-2 : 5 : 7-acid, benzoyl-2 : 5 : 7-acid, m-aminobenzoyl-2 : 5 : 7-acid, the urea of 2 : 5 : 7-acid, 5 : 51-dioxy-2 : 21-dinaphthylamine-7 : 71 - disulphonic acid, or the urea of m-aminobenzoyl-2 : 5 : 7-acid.  The products are substantive cotton dyes.  Copper compounds may be produced on the fibre by after treatment with copper salts of the direct dyeings or prints of the dyes; the copper compounds give bordeaux to violet shades.  Examples are given of the preparation of:-(1) a monoazo dye from 6-nitro-2-amino-1-oxybenzene-4-sulphonamide and phenyl-2 : 5 : 7-acid; a disazo dye from two molecular parts of 2-amino -1-oxybenzene-4-sulphonamide and 5 : 51-dioxy-2 : 21-dinaphthylamine-7 : 71-disulphonic acid; a disazo dye from two molecular parts of 2-amino-1-oxybenzene-4-sulphonamide and the urea of 2 : 5 : 7-acid; a disazo dye from two molecular parts of 2-amino-1-oxybenzene-4-sulphonanilide and the urea of 2 : 5 : 7-acid; a disazo dye from 2-amino-1-oxybenzene-4-sulphonamide, 2-amino-1-oxybenzene-4-sulphonic acid, and 5 : 51-dioxy-2 : 21-dinaphthylamine-7 : 71-disulphonic acid.  An example is also given of the after-treatment of the dyeings with copper sulphate. Specifications 12250/15, 12932/15, and 126,460 are referred to.  The Specification as open to inspection under Sect. 91 (3) (a) is not confined to the above-specified derivatives of 2 : 5 : 7-aminonaphthol sulphonic acid, and describes also the production of copper compounds of the dyes in substance by treating solutions of the dyes with copper or copper compounds or by coupling the dye components in the presence of copper or a copper compound, and also the production of copper compounds on the fibre by the addition of a soluble copper compound to the dye-bath or printing-colour.  This subject-matter does not appear in the Specification as accepted. 2-Amino-6-nitro-1-oxybenzene-4-sulphonamide is prepared by converting 1-chlor-2 : 6-dinitrobenzene-4-sulphonic acid into its amide, replacing the chlorine by the hydroxy group by means of caustic soda lye, and partly reducing the product.ALSO:Substantive cotton dyes are obtained by coupling one or two molecular parts of a diazotized o - aminooxyarylsulphonamide of the formula (OH) (NH2) R-SO2NHX (R=aryl or substituted aryl, X=hydrogen or aryl), or one molecular part of such a diazo compound and one molecular part of any aromatic o - oxydiazo compound, with one molecular part of the following derivatives of 2 : 5 : 7-aminonaphthol sulphonic acid:-phenyl-2 : 5 : 7-acid, benzoyl-2 : 5 : 7-acid, m-aminobenzoyl-2 : 5 : 7-acid, the urea of 2 : 5 : 7-acid, 5 : 51 - dioxy - 2 : 21-dinaphthylamine-7 : 71-disulphonic acid, or the urea of m-aminobenzoyl-2 : 5 : 7-acid. Copper compounds may be produced on the fibre by after-treatment with copper salts of the direct dyeings or prints of the dyes; the copper compounds give bordeaux to violet shades.  An example is given of the after-treatment of the dyeings with copper sulphate. Specifications 12250/15, 12932/15, and 126,460 are referred to.  The Specification as open to inspection under Sect. 91 (3) (a) is not confined to the above-specified derivatives of 2 : 5 : 7-aminonaphthol sulphonic acid, and describes also the production of copper compounds of the dyes in substance, and their production on the fibre by adding a soluble copper compound to the dye-bath or printing-colour.  This subject-matter does not appear in the Specification as accepted.