GB842933A - Process for stabilisation of compounds containing dihalogeno-ú¾-triazine groups, andthe compositions so obtained - Google Patents

Abstract

The invention comprises compositions of compounds containing at least one 4:6-dihalo-s-triazine group and a buffer mixture of the free acid and a metal salt of an arylamine sulphonic acid, each amino group in the acid being of formula: <FORM:0842933/IV(b)/1> wherein the R groups may be the same or different and each stands for an alkyl, cyloalkyl or aralkyl group, which may be substituted, containing at least two carbon atoms, which buffer mixture maintains in aqueous solution a pH of 3 to 7. Specified compounds include 2-(m-sulphoanilino)-4:6-dichloro-s-triazine and the reaction products of cyanuric halides with alkylamines, alkanolamines, arylamines, arylamine sulphonic acids, aminonaphthol sulphonic acids, alkanols, phenols and mercaptans. Specified arylamine sulphonic acids include N:N-di-n-hexylaniline-m-sulphonic, 2-N:N-diethylamino-naphthalene-6-sulphonic, 2-(N-ethyl-N-benzylamino)-toluene-4-sulphonic, 2-(N-ethyl -N-phenylamino)-ethane sulphonic, p N-ethyl-N-cyclohexylaniline-sulphonic and 4:4-bis(diethylamino)diphenyl-2:2-disulphonic acids. Preferred acids are N:N-diethyl-metanilic or -sulphanilic. The compositions are less affected by hydrolysis with loss of halogen than the unbuffered compounds. N-ethyl - N - phenylbenzylamine monosulphonic acid is prepared by sulphonating N-ethyl-N-phenylbenzylamine. Potassium 2-N:N-diethylaminonaphthalene-6-sulphonates is prepared by treating 2-naphthylamine-6-sulphonate with diethyl sulphate.ALSO:The invention comprises dyestuff compositions wherein one or more dyestuffs containing at least one 4 : 6 -dihalo-s-triazine group are mixed with a buffer mixture of the free acid and a metal salt of an arylamine sulphonic acid, each amino group in the acid being of formula: <FORM:0842933/IV (c)/1> wherein the R groups may be the same or different and each stands for an alkyl, aralkyl or cycloalkyl group, which may be substituted, containing at least two carbon atoms, which buffer mixture maintains in aqueous solution a pH of 3 to 7. Specified dyestuffs are azo, metallized azo, anthraquinone, phthalocyanine and nitro dyestuffs containing 4 : 6-dihalo-s-triazine groups. Specified arylamine sulphonic acids include N : N-di-n-hexylaniline-m-sulphonic acid, 2-N : N-diethyl-aminonaphthalene -6- sulphonic acid, 2-(N-ethyl -N- benzylamino)-toluene -4-sulphonic acid, 2-(N-ethyl -N- phenylamino) ethane-sulphonic acid, N-ethyl -N- cyclohexylaniline-sulphonic acid and 4 : 41-bis (diethylamino) diphenyl -2 : 21- disulphonic acid. Preferred acids are N : N-diethyl-metanilic or -sulphanilic. The dyestuff compositions are less affected by hydrolysis with loss of halogen than the unbuffered dyestuffs. Specifications 209,723, 298,494, 467,815, 624,054, 781,930, 785,120, 805,562, 838,338 and 838,340 are referred to.