Patent GB-642947-A (GB)
Title: Sulfonated 1,3-di(nitrophenyl) triazenes
IPC: C06B25/00
Filed: 1947-04-16
Abstract: Sulphonated triazenes of the formula <FORM:0642947/IV (b)/1> where one X is sulphonic acid and the other is hydrogen or sulphonic acid are prepared by diazotizing p-nitroaniline or 4-nitroaniline-2-sulphonic acid and treating the product with 4-nitroaniline-2-sulphonic acid or in the latter case with p-nitroaniline.  The amine is diazotized with sodium nitrite and hydrochloric acid in the usual way, the diazonium salt precipitated with salt or left in solution, and an equimolecular or slightly greater proportion of the amine added at a temperature not exceeding about 30-45 DEG  C.  The reaction mixture is filtered and the paste dried in air or vacuo.  In the Specification as open to inspection under Sect. 91, the groups NO2 and X are not limited as to their position in the nuclei, and each nucleus may be substituted once by an alkyl or alkoxy radical, e.g. methyl, ethyl, propyl, isopropyl, n-butyl, isobutyl, sec.-butyl, tert.-butyl, methoxy, ethoxy, propoxy or butoxy, or by a halogen atom such as chlorine or bromine.  The compounds are prepared by the method given above.  Specified starting materials are 2-chlor-4-nitroaniline, 6-nitro-3-amino-toluene, 6-nitro-3-amino-anisole, 2- and 3-nitroaniline-4-sulphonic acids, 3-nitroaniline-6 - sulphonic acid, 4 - nitroaniline - 3 - sulphonic acid, 5 - chlor - 2 - nitroaniline - 4 - sulphonic acid and 6-nitro-2-amino-toluene-4-sulphonic acid.  This subject-matter does not appear in the Specification as accepted.ALSO:Sulphonated triazenes of the formula <FORM:0642947/IV (c)/1> where one X is sulphonic acid and the other is hydrogen or sulphonic acid are prepared by diazotising p-nitroaniline or 4-nitroaniline-2-sulphonic acid and treating the product with 4-nitroaniline-2-sulphonic acid or in the latter case with p-nitroaniline.  They are used for dyeing synthetic fibres such as nylon and cellulose acetate.  In the Specification as open to inspection under Sect. 91, the groups NO2 and X are not limited as to their position in the nuclei, and each nucleus may be substituted once by an alkyl or alkoxy group or by a halogen atom.  Suitable starting materials for the preparation of such compounds are mentioned.  This subject-matter does not appear in the Specification as accepted.ALSO:Sulphonated triazenes of the formula <FORM:0642947/III/1> where one X is sulphonic acid and the other is hydrogen or sulphonic acid are used as pyrotechnics alone or with other materials capable of supporting combustion or with inert fillers, e.g. talc, fuller's earth or salts.  The sponge-like elastic mass resulting from the combustion has a large surface area and its use is suggested as an adsorptive body in gas masks or other adsorption equipment or as a carrier for catalysts in vapour phase reactions.  In the Specification as open to inspection under Sect. 91 the groups NO2 and X are not limited as to their position in the nuclei, and each nucleus may be substituted once by an alkyl or alkoxy group or by a halogen atom.  Suitable starting materials for the preparation of such compounds are mentioned.  This subject-matter does not appear in the Specification as accepted.