Patent GB-297003-A (GB)
Title: Manufacture of dyestuffs containing metal
IPC: C09B45/01
Filed: 1928-09-10
Abstract: 297,003. Soc. of Chemical Industry in Basle. Sept. 10, 1927, [Convention date]. Azo dyes, soluble metal compounds of.- Disazo and polyazo dyestuffs containing metals and suitable for dyeing cotton or silk or for colouring varnishes are obtained (1) by treating an azo dyestuff with an agent yielding one or more metals and thereafter either coupling the dyestuff containing metal with a diazo compound or subjecting it to diazotization and coupling with a component, the product in either case being treated, if desired, with an agent yielding one or more metals, or (2) by treating a disazo or polyazo dyestuff with an agent yielding more than one metal or successively with agents yielding different metals. The use of agents yielding magnesium is excluded. In some cases the coupling of the dyestuff component is effected in presence of the agent yielding a metal or metals. The following examples are specified. (1) The monoazo dyestuff 4-chlor-2-aminophenol # 5 : 5<1> - dioxy - 2 : 2<1>-dinaphthylamine-7 : 7<1>-disulphonic acid is heated with a solution of copper sulphate, and the separated monoazo dyestuff containing copper is coupled with diazotized 4- chlor-2-aminophenol and again heated with a solution of copper sulphate: the product dyes cotton violet from an alkaline or neutral bath. (2) The monoazo dyestuff containing copper in example 1 is coupled with diazotized 4-chlor-2- aminophenol and boiled under reflux with a solution of chromium fluoride; the product dyes cotton a fast blue-violet from a Glauber's salt bath. (3) The tetrakisazo dyestuff o, o<1>-dichlorobenzidine # (acid) 2 : 5 : 7-acid (2 mols.) # 4-chlor-2-aminophenol (2 mols.) is boiled under refiux with a solution containing copper sulphate and chromium fluoride. (4) The primary disazo dyestuff 4-chlor-2-aminophenol (2 mols.) # 5 : 5<1>-dioxy-2 : 2<1>-dinaphthylamine- 7 : 7<1>-disulphonic acid is heated under reflux with a solution of chromium fluoride, and is thereafter further heated with addition of copper sulphate ; the product dyes cotton fast blue from a neutral or alkaline Glauber's salt bath. (5) The primary disazo dyestuff of example (4) is boiled with a solution of copper sulphate, and is thereafter further heated under reflux with a solution of chromium fluoride; the product dyes cotton fast reddish blue from a neutral or alkaline Glauber's salt bath. (6) A suspension of 2 : 5 : 7-acid in acetic acid, mixed with copper sulphate, is coupled with a solution of diazotized 2-aminophenol-4 : 6-disulphonic acid, the separate monoazo dyestuff containing copper is coupled in alkaline solution with diazotized 4-chlor-2- aminophenol and. boiled under reflux with a solution of chromium fluoride ; the product dyes silk violet from an acetic acid bath. (7) A paste containing the sodium salt of the dyestuff 6-nitro-2- aminophenol-4-sulphonic acid # #-naphthol is heated with a mixture of sodium sulphide, chromium hydroxide, and sulphite cellulose liquor, and the resulting dyestuff is diazotized and coupled with salicylic acid; the product, which dyes silk black-violet, is heated under reflux with a solution containing sodium acetate, acetic acid. and ferric chloride, and the resulting dyestuff dyes silk black-violet from an acetic acid bath. An example of the dyeing process is also given. Specifications 15456/15, 16803/15, 126,460, and 272,949 are referred to. The Specification, as open to inspection under Sect. 91 (3) (a) comprises also the manufacture of certain monoazo dyestuffs containing metal and includes further examples in which (1) the dyestuff 5-nitro-2-aminophenol # phenyl-(or 4<1>- tolvl)-2 : 5 : 7-acid is boiled with a solution containing copper sulphate and nickel sulphate, a solution of chromium fluoride is then added and the boiling is continued: the product dyes cotton pure blue from a neutral or alkaline Glauber's salt bath, (2) similar products are obtained, omitting the nickel sulphate and using different proportions of copper and chromium. It includes also a reference to Specification 16803/15. This subject-matter does not appear in the Specification as accepted.