GB642329A - Azo dyes - Google Patents

Abstract

The Specification as open to inspection under Sect. 91 describes diazoamino compounds from diazotized 5-chloro-2 : 4-dialkoxyanilines, e.g. from diazotized 5-chloro-2 : 4-dimethoxyaniline and sarcosine or 2-amino-5-sulphobenzoic acid. This subject-matter does not appear in the Specification as accepted.ALSO:Water-insoluble azo dyes are manufactured by coupling a diazotized 5-chloro-2 : 4-dialkoxyaniline, in which the alkoxy groups are methoxy or ethoxy, with a coupling component containing at least one active methylene group, or an arylide of an o-hydroxycarboxylic acid having more than two fused rings of which one is aromatic or heterocyclic and the others aromatic, or an aromatic compound containing an azo group and capable of further coupling. Suitable coupling components are: ketoacid arylides of the formul (Y-CO-CH2CO-NH)n-R and Ar(CO-CH2CO-NHR)2 (wherein Y is alkyl, such as methyl, ethyl, propyl or butyl, aryl, such as phenyl, tolyl or naphthyl, or a heterocyclic radical, such as furyl or piperidyl, R is aryl, such as phenyl, diphenyl or naphthyl, n is 1 or 2, and Ar is an aromatic radical, such as phenylene, diphenylene or naphthylene), e.g. 2 : 4-dimethyl-acetoacetanilide, di-(acetacetyl)-o-tolidine and terephthaloyl - a : a 1 - bis - aceto - (4 - chloro - 5 - methyl-2-methoxy)-anilide; 1-alkyl- and 1-aryl-5-pyrazolones and their 3-alkyl derivatives, e.g. 1 : 3-dimethyl-5-pyrazolone; 2-hydroxy-11-benzo(a )carbazole - 3 - carboxy - p - anisidide, 2 - hydroxycarbazole - 3 - carboxy - p - chloranilide and 3 - hydroxyanthracene - 2 - carboxy - o - toluidide; aromatic azo compounds which may contain, in addition to the groups directing coupling, other substituents such as alkyl, alkoxy, nitro or halogen, e.g. 4-(o-nitrobenzene-azo)-1-amino-7-naphthol and 4-(51-chloro-21-methoxybenzeneazo)-resorcinol. The products may be converted in substance or on the fibre into metal (e.g. chromium, copper or cobalt) complexes. Examples describe the coupling of certain of the coupling components specified above with diazotized 2 : 4-dimethoxy- and 2-ethoxy-4-methoxy-5-chloroaniline. The Specification as open to inspection under Sect. 91 comprises also printing pastes containing an amine condensation product of a diazo derivative of a 5-chloro-2 : 4-dialkoxyaniline, a basic reacting material, a thickener and a coupling component, preferably of one of the types defined above, and the printing of textiles by applying such a paste and developing by heat treatment in the presence of an organic acid. In additional examples, cotton and rayon piece goods are printed with pastes containing ethylene glycol monoethyl ether, aqueous caustic soda, gum tragacanth, the diazoamino compound from diazotized 5-chloro-2 : 4-dimethoxyaniline and sarcosine or 2-amino-5-sulphobenzoic acid, and certain of the coupling components specified above, and developed by treatment in an ager with live steam containing the vapours of acetic acid. This subject-matter does not appear in the Specification as accepted.