ES264911A1 - New disazo-dyestuffs and their manufacture and use - Google Patents

Abstract

The invention comprises disazo dyes of formula <FORM:0959314/C3/1> wherein X is a hydrogen atom or sulphonic acid group and D and D1 are diazo component residues at least one of which contains bound through a carboxylic acid or sulphonic acid alkylamide or arylamide group an acylamino substituent which is known to be capable of entering into chemical combination with the hydroxyl groups of cellulose. The dyes may be prepared by coupling 2 mols. of one or two suitably substituted diazonium compounds with 1 mol. of 1-amino-8-naphthol-3 : 6- or -4 : 6-disulphonic acid or 1-amino-8-naphthol-4-sulphonic acid, or by reacting a disazo dye of the above formula, but wherein at least one of D1 and D contains an acylatable amino group linked through a sulphonic acid or carboxylic acid alkylamide or arylamide group, with an acylating agent such as p-chloro- or bromo - propionyl chloride, a : b - dichloropropionyl chloride, acrylyl chloride, a -chloroacrylyl chloride, propiolyl chloride, a - or b -chloro-maleyl chloride, sulphochloroacetyl chloride, tri - and tetra - halopyrimidines, 2,4-dichloropyrimidine-5-sulphonic acid, 5-nitro- or -cyano - 2,4,6 - trichloropyrimidine, cyanuric halides and their primary condensation products with ammonia or amino-, hydroxy- or mercapto-compounds. The dyes may be used to dye cellulose fibres in the presence of an acid-binding agent in blue shades. In examples: (1) 1-amino-8-naphthol-3,6-disulphonic acid is coupled successively in acid and alkaline medium with 1 mol. of diazotized 1-(31-aminobenzenesulphonylamino) - 5 - acetylaminobenzene-2-sulphonic acid to yield a disazo dye which is hydrolysed in acid medium and the diamino-disazo dye condensed with cyanuric chloride and finally treated with ammonia to replace a second chlorine atom (7) the disazo dye 1 - (31 - aminobenzenesulphonylamino) - 5 - (b - chloropropionylamino) - benzene - 2 - sulphonic acid \sQ 1 - amino - 8 - naphthol-4 : 6-disulphonic acid is prepared. Further examples and alternative reactants are specified. Specifications 797,946, 822,047, 831,371, 847,635, 848,742, 858,183, 875,946, 885,814, 885,815, 886,379 and 888,582 are referred to.