Patent GB-270883-A (GB)
Title: Process for dyeing artificial silk
IPC: C09B33/10
Filed: 1926-04-16
Abstract: 270,883. British Dyestuffs Corporation, Ltd., Baddiley, J., Chorley, P., and Brightman, R. April 16, 1926. Azo dyes. - Regenerated cellulose materials, such as viscose silk, are dyed in level shades by means of the azo dyestuffs made by coupling diazo compounds of aniline, its homologues and substitution products, and naphthylamines and their sulphonic acids with compounds of the general formula where R represents -CO-, -CS-, or a straight chain made up of two or more-CH2- or -CO- groups, e.g. -CO-GO-. -CH2-CH2-, -CH2- CO-, or -CH2-CO-CH2-. The dyestuffs are made by combining one or two mols. of the same or different diazo compounds with one mol. of the component; the monoazo dyestuffs may be developed on the fibre with diazo compounds. In an example of the dyeing process, regenerated cellulose silk is dyed an even bright red shade in a warm bath made up with Glauber's salt, soap and the dyestuff from diazotized o-toluidine (2 mols.) and 8 : 8<1>-dioxy-2 : 2<1>-dinaphthylurea-6 : 6<1>-disulphonic acid; the dyestuff made from p-anisidine, naphthionic acid and 8 : 8<1>-dioxy-2 : 2'-dinaphthyl - alpha-#-ethylenediamine-6: 6<1>-disulphonic acid gives a red-brown shade. The shades produced on viscose silk from the following dyestuffs are tabulated :-(1) the monoazo dyestuffs from m-xylidine or p-nitraniline and the dinaphthylurea; these may be developed on the fibre with diazotized p-nitraniline, (2) the symmetrical disazo dyestuffs from the dinaphthylurea and aniline, m-xylidine, o-anisidine, p-chloraniline, and p-aminoacetanilide. the acetyl groups being removed after coupling: the dyestuff may be diazotized on the fibre and developed with #-naphthol. m-toluylenediamine, or #-oxynaphthoic acid, (3) the mixed disazo dyestuffs from the dinaphtbylurea and aniline and p-aminoacetanilide. maminobenzoic acid. sulphanilic acid. naphthionic acid, or m-xylidine (4) the symmetrical disazo dyestuffs from the dinaphthylthiourea and aniline, m-aminobenzoic acid, and p-aminoacetanilide (the acetyl groups being removed after coupling; the dyestuff may be diazotized on the fibre and developed with #-naphthol or m-toluylenediamine), (5) the symmetrical disazo dyestuffs from the dinaphthylethylenediamine and p-chloraniline, oanisidine, or p-aminoacetanilide (the acetyl groups being removed after coupling), (6) the symmetrical disazo dyestuffs from p-chloraniline ur sulphanilic acid and N : N<1>-8 : 8<1>-dioxy-2 : 2<1>-dinaphthylglycinamide-6 : 6<1>-disulphonic acid, pchloraniline and 8 : 8<1>-dioxy-2 : 2<1>-dinaphthyloxamide-6 : 6<1>-disulphonic acid, and p-chloraniline or 4-chlor-2-anisidine aud N : N<1>-8 : 8<1>-dioxy- 2 : 2<1> - dinaphthyl-alpha-gamma-diaminoacetone-6 : 6<1>-disulphonic acid. One of the Provisional Specifications gives a further example of the dyeing process, in which the mixed disazo dyestuff made by coupling the dinaphthylethylenediamine with p-anisidine and naphthionic acid is used. 8:8<1>- Dioxy-2 2<1>-dinaphthyloxamide-6: 6<1>-disulphonic acid is made from oxalyl chloride and the sodium salt of 2 : 8 : 6-aminonaphtholsulphonic acid. N: N<1>8 : 8<1>-dioxy-2: 2<1>-dinaphthil-alpha-gamma-diaminoacetone-6: 6<1>-disulplionic acid is made from 2: 8: 6 acid and a-y-diclMoracetone.