Patent GB-325208-A (GB)
Title: Improvements in the manufacture and production of ª¤-hydroxyazo dyestuffs and of metal compounds therefrom
IPC: C09B45/14
Filed: 1928-08-07
Abstract: 325,208. Johnson, J. Y., (I. G. Farbenindustrie Akt.-Ges.). Aug. 7, 1928. Azo dyes and metal compounds thereof; lakes. -o-Oxyazo dyestuffs capable of conversion into complex metal compounds are obtained by coupling diazotized sulphonated o-aminophenols or oaminonaphthols, or their derivatives which are free from carboxylic groups, with unsulphonated p-substituted phenols which are free from carboxylic and amino groups and do not contain more than two rings. The products have good strength and equalizing properties, and their dyeings on wool are very fast when after-treated with salts of chromium or copper; the complex metal compounds dye wool in fast yellow-brown to violet shades and have good equalizing properties; they are also applicable for dyeing leather, printing on cotton, and production of colour lakes. The following examples are specified.-(1) The dyestuff 4-nitro-2-aminophenol- 6-sulphonic acid # as -m-xylene gives on wool pale yellow-brown dyeings which turn a deeper brown with a yellowish sheen on chroming; if the diazo component is replaced by 6-nitro-2-aminophenol-4-sulphonic acid, the dyeings on wool are red-brown changing to black-brown on chroming. (2) The dyestuff 4-chloro-2-aminophenol-6-sulphonic acid # pseudocumenol gives on wool brown-red dyeing which become fast dark brown on chroming; if the diazo component is replaced by 4-nitro-2-aminophenol-6-sulphonic acid, the dyeings on wool are red-brown changing to very even olive-brown on chroming. (3) The dyestuff 4-nitro-2-aminophenol-6-sulphonic acid # 4- chlor-3-methylphenol gives on wool dyeings which are fast yellow-brown on chroming. (4) The dyestuff 4-nitro-2-aminophenol-6-sulphonic acid # 4-oxydiphenylmethane gives on wool dyeings which are fast brown on chroming; similar products are obtained when the coupling component is replaced by 4-oxydiphenylether, 4-oxydiphenylamine, or 4-oxydiphenyl. (5) The chromium compound of the dyestuff 4-nitro-2-aminophenol- 6-sulphonic acid # p-cresol gives on leather or wool even brown dyeings fast to light; if the diazo component is replaced by the nitrated diazo compoung of 1 : 2-aminonaphthol-4-sulphonic acid the dyeings are brown-violet; other metal, e.g. copper, compounds of these dyestuffs may be used similarly. (6) The chromium compound of the dyestuff 4-nitro-2-aminophenol-6-sulphonic acid # 1-methyl-3-oxy-6-chlorobenzene gives on leather fast yellow-brown dyeings. (7) The chro. mium compound of the dyestuff 4-nitro-2-aminophenol-6-sulphonic acid # as-m-xylenol gives on wool even deep brown dyeings fast to washing, fulling, and light; if the diazo component is replaced by 6-nitro-2-aminophenol-4-sulphonic acid, redder dyeings are obtained. (8) The chromium compound of the dyestuff 4-nitro-2-aminophenol- 6-sulphonic acid # pseudooumenol gives on wool fast even olive brown dyeings; if the diazo component is replaced by 4-chlor-2-aminophenol- 6-sulphonic acid the dyeings are brown. (9) The copper compounds of the dyestuff 4-nitro-2-aminophenol-6-sulphonic acid # 4-chlorophenol gives on leather fast red-brown dyeings; the corresponding chromium compound gives on wool fast yellow-brown dyeings. Reference has been directed by the Comptroller to Specifications 104,743 and 269,934.