GB532261A - Manufacture of azo-dyestuffs - Google Patents

Abstract

532,261. Dyes ; dyeing. SOC. OF CHEMICAL INDUSTRY IN BASLE. July 20, 1939, Nos. 21081 and 21082. Convention dates, July 22, 1938 and July 1, 1939. Sample furnished. [Classes 2 (iii) and 15 (ii)] Trisazo dyes are made by combining a dihydroxy compound of the aryl series which is capable of coupling twice, on the one hand with a diazotized amine of the general formula where V is a lake-forming group, e.g. a hydroxyl, carboxyl or alkoxy group, X is hydrogen or a non-solubilizing group, and Y, Z, may be hydrogen or any substituents, and on the other hand with a diazoazo compound obtained by coupling a tetrazotized diaminodiphenyl on one side only with an o-hydroxybenzoic acid. Specified substituents X are nitro or sulphonamide groups and halogen atoms, while Y and Z may be sulphonic, carboxyl, nitro or alkyl groups or halogen atoms. The products dye fibres containing cellulose or regenerated cellulose chiefly in brown shades. The dyeings or prints may be treated with copper compounds, in the dye bath or on the fibre, or the dyestuffs may be partially metallized, and the resulting dyeings treated with metallizing agents, especially agents yielding copper, as described in Specification 516,076. In examples, dyestuffs are made from (1) benzidine, salicylic acid or o-cresotinic acid, resorcinol, and 1-hydroxy-2- amino-4-chloro-sulphamido-, or nitro-benzene or 4 - nitro - 2 - aminophenol - 6 - sulphonic acid, and (2)3:3'-dimethyl (or dimethoxy)-4:4<SP>1</SP>-diaminodiphenyl, salicylic acid or o-cresotinic acid, resorcinol, and 4-nitro-2-aminophenol or its 6-sulphonic acid or 4-sulphamido-2-aminophenol. In an example of the dyeing process, cotton is dyed with one of the dyestuffs of example (1) in a bath containing sodium carbonate, to which glauber's salt is added, and later on copper sulphate and tartaric acid. Specifications 12932/15, 101601, [both in Class 2 (iii)] and 455,274 also are referred to A sample has been furnished under Sect. 2 (5) of a dyestuff made from benzidine, salicylic acid, resorcinol and 4-chloro-2-aminophenoxyacetic acid. The Specification as open to inspection under Sect. 91 comprises also the conversion of the dyestuffs into completely metallized products by treating them in substance with agents yielding metals, e.g. with chromium, iron, cobalt, nickel, and copper compounds. The products are, as a rule, sparingly soluble or insoluble, and may be dyed by the process of Specification 458,501. This subject-matter does not appear in the Specification as accepted.