Patent GB-773913-A (GB)
Title: New polyazo dyestuffs and their manufacture
IPC: C09B35/46
Filed: 1955-05-04
Abstract: The invention comprises dyestuffs of formula <FORM:0773913/IV(b)/1> where A is a benzene or naphthalene residue, D is a residue of an aromatic diamine containing one or two benzene nuclei, n is 1 or 2, one X is H and the other OH or NH2, R is H, alkyl, aralkyl, cycloalkyl or phenyl and the benzene nucleus may contain other substituents.  They may be made by coupling a tetrazo compound of the di amine corresponding to D in an acidic medium with one mol of a 1, 8 - naphthylamine sulphonic acid, then in an alkaline medium with one mol of any appropriate diazo compound corresponding to A and combining the disazo-diazo compound thus formed with the required 1, 2 - or 1, 4 - diamino - or amino - hydroxy compound.  Specified tetrazo components are benzidine, o- and mtolidine and dianisidine and their sulphonic acids, 4, 41 - diaminostilbene - disulphonic acid and p - phenylene diamine.  Specified middle components are 1 - amino - 8 - naphthol - 3, 6-, -4, 6 - and -3, 5- di and - 4 - mono - sulphonic acids. The component A may contain substituents such as halogen atoms or nitro, amino, alkyl-, aryl- and acyl - amino, alkyl, alkoxy, carboxy and sulpho groups.  The dyestuffs dye textiles made of animal, vegetable or synthetic fibres and are particularly suited to the dyeing of leather to which they impart bluish black shades The dyestuffs enhance the penetration of leather dyestuffs which have insufficient penetration and therefore may be used in admixture with the latter type of dyestuff.  Dyestuff mixtures may also be made by combining one of the above disabo-diazo compounds with a mixture of an end component such as m-phenylene or toluylene diamines and m-aminophenyl or a nuclear or N - substituted derivative thereof, and a suitable 1, 2 - or 1, 4 - diamino- or - amino - hydroxy compound. Examples are provided illustrating the preparation of the dyestuffs and their use in dyeing processes, middle components are selected from those specified above, end components corresponding to A are aniline, its 4-sulphonic acid and the amide thereof, 2-chloroaniline and its 4 - and 5 - sulphonic acids, 4 - chloroaniline and its 2- and 3 - sulphonic acids, 2 - aminotoluene - 4 - and 5 - 3 - aminotoluene - 4 - and - 6 - and 4 - aminotoluene - 2 - and - 3 - sulphonic acids, 2 - aminotoluene - 2 - sulphonamides, 4 - and 5 - acetylamino - 2 - aminobenzene - 1 - sulphonic acids, 4 - aminophenylaminoethane sulphonic acid, 2 - , 3 - and 4 - aminobenzoic acids, 2 - amino - 1 - methoxybenzene - 4 - sulphonic acid, 4 - amino - 1 - methoxybenzene - 2-and 3 - sulphonic acids, 4 - amino - 1 - methoxybenzene - 2 - sulphonamide, 2 - nitroaniline - 4 - and 4 - nitroaniline - 2 - sulphonic acids, cresidine-, xylidine- and chlorotoluidine - sulphonic acids, 1 - naphthylamino - 4 -, - 5 -, - 6 - and - 7 - mono - and 5, 7 -, - 4, 8 -, - 3, 6 - and 3, 8 - di-sulphonic acids, the end components used containing R being 1, 2 - and 1, 4 - diamino - benzene, 4 - chloro - 1, 2 - diaminobenzene, 2 - aminodiphenylamine, N - ethyl -, - diethyl - and - dimethyl - amino - 4 - aminobenzenes, N - methyl -, - isopropyl -, - cyclohexyl- and -benzyl - amino - 2 - and - 4 - aminobenzenes, 1 - amino - 2 - and - 4 - phenols, 4 - methyl - 2 amino - and 4 - N - methylamino - 1 - phenols and mixtures of 1 - amino - 3 - phenol or 1, 3 - diaminobenzene with 1, 2 - diaminobenzene.