GB707897A - New azoic coupling components and new azoic colouring process for textiles - Google Patents

Abstract

The invention comprises azoic coupling components of the formula <FORM:0707897/IV (b)/1> where R1, R2 and R3 are hydrogen or alkyl groups of 1-3 carbon atoms. These are made by condensing 2 : 3-oxynaphthoic acid with the appropriate amino-indazole in the presence of a condensing agent such as phosphorus trichloride, preferably in an organic medium such as toluene. Examples show the production of arylides from 6-amino-indazole, 6-amino-3-methylindazole, 6-amino-5-methylindazole and 6-amino-7-methylindazole. According to the Provisional Specification, R1 may be a lower alkyl or alkoxy group or an aryl group of the benzene series and R2 and R3 may be lower alkyl or alkoxy groups. p ALSO:Azo dyes are made on the fibre by coupling a diazotized amine of the benzene series with an arylide of the formula <FORM:0707897/IV(c)/1> where R1, R2 and R3 are hydrogen or alkyl groups of 1-3 carbon atoms. The diazotized amine may be used in stabilized form. The components are especially suitable for processes in which the dye liquor is circulated through the material to be dyed. In the examples cotton yarn or piece goods are impregnated with an alkaline solution of 6-(2\sv : 3\sv-oxynaphthoylamino)-indazole and developed with the diazonium salt of (1) 2 : 5-dichloraniline, (2) 4-chloro-o-anisidine and (3) 5-nitro-o-anisidine. Red shades are produced. The corresponding arylides from 3-methylindazole, 5-methylindazole and 7-methylindazole may also be used. Other specified diazo components are m-chloraniline, 4-nitro-o-toluidine, 4-chloro-o-toluidine, 4-benzylsulphonyl-o-anisidine, 4-ethylsulphonyl-o-anisidine, 4-nitro-o-anisidine, 4 : 4\sv-dichloro-2-amino-diphenylether, 2 : 5-dimethoxy-4-cyanoaniline and o-aminoazotoluene. If desired the materials may be dried before development with the diazo component. According to the Provisional Specification R1 may be a lower alkyl or alkoxy group or an aryl group of the benzene series and R2 and R3 may be lower alkyl or alkoxy groups.