Patent GB-730106-A (GB)
Title: Improvements in and relating to the production of oxidation dyestuffs on fibres
Inventor: LANTZ ROBERT LAZARE
IPC: D06P1/32
Filed: 1952-11-27
Abstract: Oxidation dyes are formed on fibres of natural or regenerated cellulose, cellulose acetate, superpolyamides, wool and silk and also on furs, feathers, horsehair, bristles and human hair by applying, as by dyeing, padding or printing methods, a salt of a mono- or di-sulphamic acid derived from a benzene diamine (i.e. an N-sulphonic acid derivative of a benzene diamine), each amino group of which may be substituted, at most, by one alkyl, arylalkyl or cycloalkyl group, and the benzene nucleus of which may be substituted by one or more halogen atoms or alkyl, alkoxy or nitro groups, and then effecting oxidation on the fibre.  For effecting the oxidation, an oxidizing agent, e.g. a chlorate, chromate, bichromate, nitrite or peroxide, may be applied with or after the sulphamate, if desired in the presence of an oxidation catalyst, e.g. a derivative of cerium, osmium, vanadium or copper or a ferrocyanide.  Development of the dyestuff may be effected by the application of an acid, as an aqueous solution or as a mixture with steam or air or in the form of a substance, e.g. a salt of a volatile base such as ammonia, an amide, an organic ester or a mineral sulphonate, which will liberate an acid by treatment with, for example, moist air or neutral or acid steam. Partial or complete removal of the sulphonic acid groups of the sulphamate on the fibre may be effected, prior to oxidation, by treatment with an acid.  The sulphamates may be mixed with other materials capable of forming oxidation dyes and, in printing, they may be mixed with or printed side-by-side with vat dyes or azo-dye components, the two types of dyestuffs being preferably developed together.  White or coloured discharges may be effected by printing, e.g. with vat dyes, on fabrics previously padded with the sulphamates.  Specified sulphamates are 1 : 4-, 1 : 3- and 1 : 2-diaminobenzene - N - sodium sulphonate, 2 : 4 - diamino - 1 p  - methyl - benzene - N2 - sodium sulphonate, 1 : 4 - diaminobenzene - N1 : N4-sodium disulphonate, 1 - methyl - 3 : 4 - diaminobenzene - N4 - sodium sulphonate, 1-methyl - 2 : 5 - diaminobenzene - N2 - sodium sulphonate, 4 - chloro - 1 : 2 - diamino - benzene-N1 - sodium sulphonate, 3 - chloro - 1 : 4 - diaminobenzene - N4 - sodium sulphonate, 2 : 4-diamino - 1 - methoxy - benzene - N2 - sodium sulphonate, 2 : 5 - diamino - 1 - methoxybenzene - N2 - sodium sulphonate, N1 - methyl-1 : 4 - diaminobenzene - N1 - sodium sulphonate, N2 - ethyl - 2 : 5 - diamino - 1 - methyl - benzene-N2 - sodium sulphonate, 4 - chloro - 2 : 5 - diamino - 1 - methoxy - benzene - N5 - sodium sulphonate, 2 : 4 - diamino - 1 : 3 - dimethylbenzene - N4 - sodium sulphonate, 5 - methyl-2 : 4 - diamino - 1 - methoxybenzene - N2-sodium sulphonate, 2 : 6 - dichloro - 1 : 4 - diaminobenzene - N4 - sodium sulphonate, 3 : 4-diamino - I - methoxybenzene - N4 - sodium sulphonate, 2 : 5 - dichloro - 1 : 4 - diaminobenzene - N1 - sodium sulphonate, 2 : 5 : 6 - trichloro - 1 : 4 - diaminobenzene - N4 - sodium sulphonate, 3 - nitro - 1 : 4 - diaminobenzene-N1 - sodium sulphonate and N1 - methyl - 1 : 4-diaminobenzene - N4 - sodium sulphonate. Numerous examples describe the printing of cotton, cellulose acetate, chlorinated wool, silk and regenerated cellulose fabrics, the padding of cotton fabrics and the dyeing of rabbit fur. Specification 498,755 is referred to.ALSO:Reference is made to the preparation of the following salts of mono- or di-sulphamic acids derived from a benzene diamine: (a) 1-methyl-3 : 4 - diaminobenzene - N4 - sodium sulphonate, 1 - methyl - 2 : 5 - diaminobenzene - N2 - sodium sulphonate, 4 - chloro - 1 : 2 - diaminobenzene - N1 - sodium sulphonate, 3 - chloro - 1 : 4 - diaminobenzene - N4 - sodium sulphonate, 2 : 4 - diamino - 1 - methoxybenzene - N2 - sodium sulphonate, 2 : 5-diamino-1-methoxybenzene-N2-sodium sulphonate, N1-methyl-1 : 4-diaminobenzene-N1-sodium sulphonate, N2-ethyl-2 : 5-diamino-1-methylbenzene-N2-sodium sulphonate, 4 - chloro - 2 : 5 - diamino - 1 - methoxybenzene - N5 - sodium sulphonate, 2 : 4 - diamino - 1 : 3 - dimethylbenzene - N4 - sodium sulphonate, 5 - methyl - 2 : 4 - diamino - 1 - methoxybenzene - N2 - sodium sulphonate, 2 : 6-dichloro - 1 : 4 - diaminobenzene - N4 - sodium sulphonate and 3 : 4 - diamino - 1 - methoxybenzene - N4 - sodium sulphonate, all of which may be prepared by sulphonating the appropriate nitro derivatives of aniline or its substitution products followed by reduction; (b) 2 : 5-dichloro - 1 : 4 - diaminobenzene - N1 - sodium sulphonate, prepared by sulphonating 4-acetylamino - 2 : 5 - dichloro - 1 - aminobenzene followed by deacetylation; (c) 2 : 5 : 6 - trichloro - 1 : 4 - diaminobenzene - N4 - sodium sulphonate, prepared by the partial sulphonation of 2 : 5 : 6-trichloro-1 : 4-diaminobenzene; (d) N1 - methyl - 1 : 4 - diaminobenzene - N4 - sodium sulphonate, prepared by the action of sodium bisulphite on the acetylated derivative of 4-nitro-methyl-aminobenzene, followed by saponification of the acetyl group.