Patent GB-189807659-A (GB)
Title: Manufacture of New Trisazo-colouring Matters capable of Dyeing Unmordanted Cotton and of Yielding Blue Shades by Development on the Fibre.
Inventor: IMRAY OLIVER
Filed: 1898-03-30
Granted: 1898-06-25
Abstract: 7659. Imray, O., [Soc. of Chemical Industry in Basle]. March 30. Dyes, artificial.-Relates to azo dyes of the class described in Specification No. 4460, A.D. 1894, and consists in the production of new trisazo dyes of the general formulawhere A stands for the residue of 2 :8 : 6-amidonaphthol sulphonic acid or 2 : 8 : 3 : 6-amidonaphthol disulphonic acid ; P stands for the residue of a paradiamine, such as benzidine, tolidine, ethoxybenzidine, a diamidodiphenol ether, diamidodiphenylamine, or p-amido-acetanilide, -toluidide, - cresidide, or -naphthalide, or 1 : 4 : 7- or 1 : 4 : 2- amido-acetonaphthalide sulphonic acid ; X stands for primary aromatic amines not substituted in the p-position, such as p-cresidine, p-xylidine, amidop-chlorotoluene, 1 : 2-a-naphthylamine sulphonic acid, o-toluidine, alpha-naphthylamine-#- sulphonic acid, or a 1 : 2-amidonaphthol sulphonic acid ; and Y stands for a naphthol, or a derivative thereof not containing a diazotizable amido group, such as alpha- or #-naphthol, 1 : 4-, 1 : 5-, 2 : 6-, or 2 : 7-naphthol sulphonic acid, #-naphthol disulphonic acid, 1 : 8-chloronaphthol disulphonic acid, 1 : 8-alkyloxynaphthol mono- or disulphonic acid, 1 : 8-dioxynaphthalene mono- or di-sulphonic acid, alkylated amidonaphthol disulphonic acid-H, alkylated amido - naphthol sulphonic acid-gamma, #-oxynaphthoic acid, or sulphonated alpha- or #-dioxynaphthoic acids. These dyes yield directly upon unmordanted cotton blackish-violet, grey, and black shades of no technical value, but they are capable of diazotization upon the fibre and of subsequent development with #-naphthol, whereby they are changed into violet blue, marine blue, and indigo blue dyes of greater intensity and greater fastness to light and washing. They are produced by the following processes, viz.:-(1) The tetrazotized p-diamine is combined with a molecular proportion of a monazo dye derived from diazotized 2 : 8 : 6- or 2 : 8 : 3 : 6- amidonaphthol sulphonic acid and one of the aromatic amines X above, and with a molecular proportion of a naphthol compound of the type Y above. (2) A mixed disazo dye prepared from equal molecular proportions of a tetrazotized p-diamine, a 2 : 8 : 6- or 2 : 8 : 3 : 6-amidonaphthol sulphonic acid, and a naphthol compound of the type Y, is again diazotized and combined with an amine of the type X. (3) A mono-azo dye, prepared from the diazo compound of an acetylated p-diamine of the type P and a naphthol of the type Y, is saponified, and the amido-azo product is diazotized and combined with a molecular proportion of a mono-azo dye obtained from 2 : 8 : 6- or 2 : 8 : 3 : 6-amidonaphthol sulphonic acid and an amine of the type X. (4) A mono-azo dye obtained from an acetylated p-diamine and 2 : 8 : 6- or 2: 8 : 3 : 6-amidonaphthol sulphonic acid is saponified, tetrazotized, and combined first with an amine of the type X and then with a napbthol of the type Y, or vice versÔ, or with two identical or different molecules of certain of the amines of the type X and naphthols of the type Y. (5) A mono-azo dye produced from an acetylated pdiamine of the type P and a naphthol compound of the type Y is saponified, diazotized, combined with 2: 8 : 6- or 2:8:3:6-amidonaphthol sulphonic acid, again diazotized, and combined with an amine of the type X.