GB255900A - Manufacture of azo-dyestuffs - Google Patents

Abstract

255,900. I.G. Farbenindustrie Akt.- Ges., (Assignees of Farbwerke vorm. Meister, Lucius, & Br³ning). July 25, 1925, [Convention date]. Addition to 231,529. Monoazo dyes; lakes.-Azo dyes are produced in substance, on a substratum, or on the fibre by coupling with 2 : 3-oxynaphthoic arylides the diazo compounds derived from bases of the general formula where R1 is an alkyl, aralkyl or aryl group, R2 an aryl group, and R3 an alkyl or aralkyl group; the products give redder hues than those obtained from the dvestuffs described in the parent Specification. In examples, 4-benzenesulphomethy]- amino-2-amino-1-anisol is diazotized and coupled with 2 : 3-oxynaphthoic-5-chlor-2-toluidide to produce the dyestuff in substance, or cotton is prepared with the component and dyed by treating with the diazo solution; bright claret-red tints are obtained. Similar dyestuffs are obtained by using other bodies of the above general formula e.g. the 4-mono- or dichlor-benzenesulphomethylamino-2-aminoanisols as diazo components, or by coupling with other 2 : 3-oxynaphthoric arylides. Specification 248,766 is referred to. The Specification as open to inspection under Sect. 91 (3) (a), comprises also a table showing the shades obtained from the dyestuffs from the following components :-4-benzenesulphomethyl. amino-2-amino-1-anisol and 2 : 3-oxynaphthoic-otoluidide; 4-chlorbenzenesulphoamino-2-amino-1- anisol and the o-toluidide or a-naphthylamide; 4- naphthalene - #- sulphomethylamino-2-amino-1- anisol and the 5-chlor-2-toluidide, 4-chlor-2-anisidide, and a- and #-naphthylamide ; 4-naphthalene - asulphomethylammo-2 - amino-1- anisol and the 4-chlor-2-anisidide and #-naphthylamide; 4- toluene - sulphomethylamino - 2 - amino - 1 - anisol and the o-toluidide, 4-chlor-2-anisidide, and alpha- and #-naphthylamide; and 4-toluene-sulphobenzylamino-2-amino-1-anisol and the 5-chlor-2- toluidide and #-naphthylamide. This subjectmatter does not appear in the Specification as accepted. 2-Amino-4-arylsulpho-alkyl (or aralkyl) amino- I-alkyl (aralkyl, or aryl) oxybenzences are obtained by causing an arylsulphochloride or a substitution product thereof to act on a 4-amino-2-nitro-1-alkyl (arlkyl, or aryl) -oxybenzene, alkylating or benzylating the product and reducing.