GB485920A - Process for dyeing cellulose - Google Patents

Abstract

Acid wool dyes, dyeing with; regenerated celluloses, dyeing.-A compound of chromium, iron, cobalt, nickel, molybdenum, vanadium, tungsten or copper is incorporated in and fixed upon cellulosic fibres by an animalizing agent, other than an albuminous substance, and, thereafter, the fibres are dyed with an acid wool dyestuff other than a chrome dyestuff. The use of the animalizing agents described in Specifications 461,666 and 466,099 with copper artificial silk, when the residual copper from the artificial silk solution is relied upon to provide the metal compound, is disclaimed. Specified animalizing agents are polymerized ethyleneimines, urea and guanidine derivatives, basic condensation products of phenol and formaldehyde with aliphatic amines, reaction products of various halogenated compounds with ammonia or amines, and high-molecular ammonium, phosphonium and sulphonium compounds. The fibre may be treated successively with solutions or emulsions of the animalizing agent and the metal compound in either order or with animalizing agent and metal compound in the same bath or with a complex compound of the metal compound with the animalizing agent, such as the compounds of chromium chloride with ethylenediamine or with aminosalicylic acid and pyridine. In the treatment of artificial cellulosic fibres, the animalizing agent and/or the metal compound may be incorporated therewith during their production, e.g. by addition to the spinning solution. In examples: (1) copper artificial silk is treated for 1/2 hour with a solution at 60 DEG C. of a condensation product obtainable by treating polyepichlorhydrin (cf. Specification 477,843) with a solution, at 150 DEG C. and under pressure, of ammonia in methyl alcohol, squeezed, dried at 80 DEG C., treated for 20 minutes with a solution at 50-80 DEG C. containing potassium bichromate and ammonium sulphate and dyed, together with an equal quantity of wool, in a boiling solution of Palatine fast blue GR to obtain the same shade on both fibres; (2) the potassium bichromate is replaced by compounds of the other specified metals; (3) a condensation product from trichloro hard paraffin and polyethylenediamine (cf. Specification 359,001) is added to a copper artificial silk spinning solution which is then spun and dyed with acid wool dyestuffs; (4) the condensation product used in (1) is incorporated with viscose during spinning and the fibre is treated with potassium bichromate and dyed in admixture with wool as in (1); (5) staple fibre from viscose or cuprammonium cellulose is treated with an aqueous solution of a copper complex compound, obtainable by treating polymerized ethyleneimine with a copper salt, and dyed with acid wool dyestuffs. Specification 414,381 also is referred to. Samples have been furnished under Sect. 2 (5) of viscose artificial silk spun from a solution containing the condensation product of example (3) above, treated for 15 minutes with an aqueous solution at 85 DEG C. containing potassium bichromate and ammonium sulphate and dyed with (1) Supranol brilliant red B, (2) Anthralan blue G.