GB697136A - Manufacture of disazo- and polyazo-dyestuffs - Google Patents

Abstract

The invention comprises the disazo and polyazo dyestuffs which are obtainable by coupling diazotized <FORM:0697136/IV (c)/1> (which may be substituted in the quinoline ring) (1) in an alkaline medium with a 1-naphthol-3-sulphonic acid containing a substituted amino group (e.g. arylamino or acylamino) in the 6- or 7-position; or (2) in an alkaline medium with a compound containing two residues of the type of (1) linked by a common amino group or by a bridge such as a urea or cyanuric residue, the second coupling position being occupied by the same or a different azo residue; or (3) in an acid medium with J acid, the product being coupled alkaline with a further diazo component. The aminoazo compounds of the above formula are made by coupling diazotized 5-amino-2-nitrobenzoic acid or 5-amino-2-acylaminobenzoic acid with the appropriate quinolinol and converting the 2-substituent into an amino group. The further diazo component in (3) may be a diazotized aniline-azo-salicylic acid. The disazo and polyazo dyestuffs may be used on animal p fibres such as wool, silk and leather. Those derived from J acid and its derivatives are suitable for dyeing and printing cotton, linen and regenerated cellulose. The dyestuffs may be metallized in the dyebath or on the fibre, e.g. by the methods of Specifications 455,274 and 619,969. In the examples the following dyestuffs are prepared: (1) 8 - quinolinol \sM 5 - amino - 2 - nitro - benzoic acid (reduced) --> N - phenyl - J acid, N - p - anisyl - J acid, N - (p - acetylamino - benzoyl) - J acid or N - phenyl - g - acid; 5 - amino - 2 - acetylaminobenzoic acid may also be used as diazo component, the acetylamino group being hydrolysed; (2) the monoazo intermediate of (1)-->(acid) J acid (alkaline)\sM cresidine\sM5-aminosalicylic acid; (3) the monoazo intermediate of (1)-->5 : 51-dihydroxy - 2 : 21 - dinaphthylamine - 7 : 71 - di - sulphonic acid\sMcresidine\sM5 - amino - salicylic acid; 8 : 81 - dihydroxy - 2 : 2 - di - naphthylamine-6 : 61-disulphonic acid or J acid urea may be used instead. In a further example cotton is dyed reddish blue with the product of (1) from N-phenyl-J acid, coppered in the dyebath or on the fibre. 8-Quinolinol-7-sulphonic acid and N-benzoyl-g -acid are also specified as components.