GB838728A - New disazo triazine dyestuffs - Google Patents

Abstract

The invention comprises dyes of formula <FORM:0838728/IV(c)/1> where A is an aryl radicle, B are the atoms required to form the residue of a p-coupling amine of the benzene or naphthalene series, Q is an imino, alkylimino or m- or p-iminobenzoylamino radicle, Y is Hlg and n is 1 or 2. A preferred class of the dyes contains a metallizable group in residue B o to the azo group (2). Copper complexes of the metallizable dyes are especially preferred. The dyes may be made by reacting equimolar quantities of appropriate naphthol sulphonic acids, aminoazo compounds and cyanuric halides. The reactants may be reacted in any required order of succession and intermediates may be isolated if desired. When coupling is effected as a second stage a pH of 6-8 is preferred. The reaction with cyanuric halides is preferably effected in an aqueous medium at 0-5 DEG C. in the presence of an acidbinding agent. The dyes are preferably isolated from the reaction medium at pH about 6.5. Indicative of specified naphthols are 1-amino-8-naphthol-6- and 1-ethyl- and p-amino-benzoylamino-8-naphthol-3,6-di-sulphonic acids. Y is specified as Br or Cl. The aminoazo compounds are derived from diazotized amines, which preferably have at least one SO3H group, and the desired p-coupling amino-benzene or -naphthalene. Examples of specified amines are 4-sulphamyl aniline, metanilic acid, 4-nitraniline- and -methoxyaniline-2-sulphonic acids, 6-chloro-4-methyl-aniline-3-sulphonic acid and 2-naphthylamine-6- and 1,5-di-sulphonic acids. Examples of p-coupling amines are aniline, 2-methoxy-5-methyl-aniline, o-anisidine, anthranilic acid, m-aminoacetanilide and 1-naphthylamine-6-sulphonic acid. Metallizable groups specified are OH, MeO, COOH and OCH2COOH. The metal complexes are preferably made by reacting an appropriate metal complex with a cyanuric halide, preferably under conditions indicated above. The dyes, in the form of alkali-metal salts, colour cellulosic textile materials in conjunction with a treatment of an acid-binding agent, see Specification 797,946, to give blue to violet shades. Examples are provided of the preparation of the dyes and their use in dyeing processes. 4 - Nitro - 41 - aminostilbene - 2,21 - disulphonic acid is listed in the examples as a component corresponding to A.