GB383064A - Manufacture of azo-dyestuffs on the fibre - Google Patents

Abstract

Azo dyes are made on the fibre by coupling an arylide of the general formula <PICT:0383064/IV/1> (in which the benzene nucleus is substituted in at least one of the positions x by an alkyl or alkyloxy group and may be further substituted) with a diazotized 2-amino-1 : 1<1>-diphenylether of the formula NH<2>-R-O-R<1>, in which R may contain, in addition to the NH<2> group, one or more further substituents and R<1> contains at least one substituent, such as halogen, alkyl or alkoxy. Vivid scarlet to blue-red tints are produced fast to light, kier-boiling and chlorine. In examples (1) cotton is impregnated with the o-anisidide or 4-chlor-2-anisidide of 2 : 3-oxynaphthoic acid and developed with diazotized 4 : 4<1>- or 4 : 2<1>-dichloro-2-aminodiphenylether. (2) The material is padded with 2<1> : 3<1>-oxynaphthoyl - 2 - aminohydroquinonedimethylether and printed with a paste containing diazotized 4-chloro-2-amino-4<1>-methyl-1 : 1<1>-diphenylether. In a table the shades produced from the following components are given : diazo components:--4 : 4<1> - dichloroamino diphenylether, 4-chloro-4<1>-methoxy or 4<1>-ethoxy-2 - aminodiphenylether, 4 - chloro - 4<1>-methyl-2-aminodiphenylether; the p-phenetidide, p- and o-toluidide, p-anisidide and 2 : 4-dimethoxyanilide of 2 : 3-oxynaphthoic acid. Specifications 6379/12, [Class 2 (iii), Dyes &c.], 17279/13, 195,600, 202,984 and 310,758, [all in Class 15 (ii), Dyeing, Processes &c. for] are referred to. 2-Amino-1 : 1<1>-diphenylethers above referred to are made by reducing the condensation products from compounds such as 2-nitro-1 : 4-dichlorobenzene, 1-nitro-2 : 4-dichlorobenzene, 1 : 2 - dinitro-5 - chlorobenzene, 2 - nitro - 1 : 4-dibromobenzene and 1 : 2 - dichloro - 4 : 5 - dinitrobenzene with substituted phenols, e.g. o-m, m- or p-cresol, xylenols, o-, m-, or p-chloro-or bromophenol, chlorocresols, dichlorophenols, hydroquinone-monoalkylethers, guaiacol and 1-oxy-3-chloro-6-methoxybenzene. p The Specification as open to inspection under Sect. 91 (3) (a) comprises also the preparation of the above dyestuffs in substance and on a substratum and specifies the dyestuff 4-chloro-2-amino-4<1>-methyl-1 : 1<1>-diphenylether --> 2 : 3-oxynaphthoic acid-o-toluidide. This subject-matter does not appear in the Specification as accepted. Reference has been directed by the Comptroller to Specification 202,984.