GB343502A - Manufacture of new dyestuffs and the application thereof - Google Patents

Abstract

Azo dyes; cellulose esters and ethers, dyeing.-Azo dyes are made in substance or on the fibre by coupling diazotized amines of the benzene and naphthalene series with unsulphonated a -naphthylamine coupling components substituted in an a - amino group by one or more aliphatic residues containing a hydroxyl group or groups. The dyestuffs derived from unsulphonated or monosulphonated diazo components are useful for dyeing cellulose esters and ethers and are readily dischargeable. Those derived from p-nitroamines of the benzene series give exceptionally strong blue to violet shades. They may be applied in aqueous solutions, suspensions or dispersions. Dispersions of insoluble dyestuffs may be prepared in the usual manner or may be prepared by the methods of Specifications 219,349, 224,925, 242,393, 242,711, 269,960, 273,819, 273,820, 322,737 and 323,788, [all in Class 15 (ii), Dyeing, Processes &c. for]. The dispersions may be made for direct use or in the form of preparations. In examples the following dyestuffs are described: (1) p-nitraniline --> g - chlor - b - oxypropyl - a - naphthylamine (reddish violet on cellulose acetate); (2) 5-nitro-2-aminoanisole or 5-nitro-2-aminophenetole --> g -chlor-b - oxypropyl - a - naphthylamine (violet); (3) p-amino-p1-dimethylaminoazobenzene --> g -chlor-b -oxypropyl - a - naphthylamine (bluished red); (4) benzeneazo - a - naphthylamine --> g - chlor - b - oxypropyl - a - naphthylamine (violet grey); (5) p-nitroaniline-o-sulphonic acid --> o -oxyethyl-a - naphthylamine (red); (6) m-nitraniline --> o -oxyethyl - a - naphthylamine (orange); (7) 5-nitro-2-aminoanisole --> o -oxyethyl - a - naphthylamine (red violet). Other diazo components tabulated are: o-nitraniline, p-chlor-o-nitraniline, o-anisidine, p-chloraniline and p-aminodiphenylamine. Specifications 319,308, 319,390, 323,792 and 324,650, [all in Class 2 (iii), Dyes &c.], also are referred to.