GB307705A - Manufacture of dyestuffs - Google Patents

Abstract

307,705. Soc. of Chemical industry in Basle. March 10, 1928. [Convention date]. Trisazo dyes and solitble, metal compounds thereof. - Trisazo dyes of the type R1 - N = N - R2 - N = N - R3, in which R1 and R3 are residues of o-oxydiazo compounds and R2 is the residue of the monoazo dyestuff 2-amino-5-Daphthol-7-sulphonic acid # (acid) 2-amino-5-naphthol-7-sulphonic acid are treated in the course of their production, in substance, in the dyebath, or on the fibre with agents yielding chromium, or with an agent or agents yieldmore than one metal, e.g. agents yielding copper- and chromium. The following examples are specified : (1) 1 mol. of the dyestuff 2: 5: 7-acid. - 7- (acid) 2: 5: 7-acid is coupled in alkaline solution with 2 mols. of diazotized 4-chlor-2- aminophenol and the trisazo dyestuff is boiled under reflux with an aqueous solution of chromium fluoride; the product gives level fast' grey dyeings on cotton or viscose from a neutral or feebly alkaline Glauber's salt bath; by boiling the trisazo dyestuff under reflux successively with aqueous solutions of suitable amounts of chromium fluoride and copper sulphate a product containing copper and chromium is obtained which gives level fast reddish-grey dyeings on cotton or viscose. (2) 1 mol. ot the dyestuff 2 : 1<1>-azonaphthalene-5: 5<1>-dioxy-2<1>-amino-7 : 71 - disulphonic acid is coupled in alkaline solution with 2 mols. of diazotized picramic acid and the trisazo dyestuff is boiled under reflux witit all aqueous solution of chromium fluoride ; the products gives uniform fastgreen-grey dyeings on cotton or viscose; the corresponding dyestuff containing copper and chromium gives blue-grey dyeings-. (3) 1 Mol. of the, dyestutf 2 : 1<1>-azonaphthalene 5:5<1>-dioxy-2<1>-amino-7:7<1>-disulphonic acid is coupled in alkaline solution with 2 mois. of diazotized 5-nitro-2-aminophenol and an aqueous solution of the trisazo dyestuff is mixed successively at the boiling point with copper sulphate and chromium fluoride; the product gives level bluegrey dyeings on cotton from an alkaline Glaubers' salt bath. (4) 1 Mol. of the dyestuff 2: 1<1>-azonaphthalene-5 : 5<1>-dioxy-2<1>-amino - -7:7<1>- disulphonic acid is coupled in alkaline solution with 1 mol. of diazotized 4-chlor-2-aminophenol and 1 mol. of diazotized picramic acid and the trisazo dyestuff is boiled under reflux with an aqueous solution of chromium fluoride; the product gives uniform jast grey dyeings on cotton or artificial silk of the regenerated cellulose type, such as viscose or cuprammonium silk; the corresponding dyestuff containing copper and chromium gives similar grey dyeings. (6) Cotton is dyed by entering the wetted goods into an aqueous soli-ttion of the dyestuff at 30-40‹ C., and boiling, with addition of sodium sulphate, or the dyebath may be made feebly alkaline with sodium carbonate or soap or feebly acid with acetic acid. (6) Viscose is dyed by entering the goods into a solution of the dyestuff at 20‹ C., and heating to 75-80‹ C. with addition of sodium sulphate. (7) Ordinary or loaded silk is dyed by entering the goods into an aqueous solution containing acetic acid of the dyestuff of Example (2) at 50-60<0> C. and heating to 80‹ C. The Specification as open to inspection under Sect. 91 (3) (a) comprises also the manufacture and use of the corresponding dyestuffs in which R.2 is one of the monoazo products 2-amino-5- naphthol-7-sulphonic acid # (acid) 2-amino-8- naphthol-6-sulphomc acid or 2-amino-8-naphthol- 6-sulphonic acid (acid) 2-amino-5-naphthol- 7-sulphonic acid, and refers to the use of agents yielding metals " of the first series of the third period of the periodic system." This subjectmatter does not appear in the Specification as accepted. Specification 26460/12 is referred to. Reference has been directed by the Comptroller to Specifications 16803/15 and 271,897 (as open to inspection under Sect. 91 of the Acts),