Fibre-reactive azo dyes containing a monofluororotriazine group

Abstract

A fibre-reactive azo dyestuff of the formula ##STR1## in which X is alkyl or alkoxy with 1 to 4 carbon atoms, carboxyl or halogen, n is 1, 2 or 3, m is 0 or 1, p is 0 or 1 and q is 0 or 1 and the benzene or naphthalene rings A, B and B' can contain further substituents in addition to SO.sub.3 H groups. The dyestuffs of the invention are suitable inter alia, for dyeing and printing silk, leather, wool, high molecular weight polyamide fibres and high molecular weight polyurethanes, but especially cellulose-containing materials having a fibrous structure.

Description

The present invention relates to fibre-reactive azo dyestuffs of the formula ##STR2## in which X is alkyl or alkoxy with 1 to 4 carbon atoms, carboxyl or halogen, n is 1, 2 or 3, m is 0 or 1, p is 0 or 1 and q is 0 or 1 and the benzene or naphthalene rings A, B and B' can contain further substituents in addition to SO.sub.3 H groups.

Possible radicals for X, as alkyl with 1 to 4 carbon atoms, are: methyl, ethyl, propyl, isopropyl, butyl, isobutyl, sec.-butyl and tert.-butyl, and as alkoxy with 1 to 4 carbon atoms are: methoxy, ethoxy, propoxy, isopropoxy, butoxy, isobutoxy, sec.-butoxy and tert.-butoxy, and as halogen are: fluorine, chlorine and bromine.

In addition to SO.sub.3 H groups, the benzene or naphthalene rings, A, B and B' contain, as further substituents, for example those which follow: alkyl groups with 1 to 4 carbon atoms, such as methyl, ethyl and propyl, alkoxy groups with 1 to 4 carbon atoms, such as methoxy, ethoxy, propoxy and isopropoxy, acylamino groups with 1 to 6 carbon atoms, such as acetylamino, propionylamino and benzoylamino, amino groups such as --NH.sub.2, methylamino and ethylamino, the ureido group, the hydroxyl group and the carboxyl group and halogen, such as fluorine, chlorine and bromine.

Fibre-reactive azo dyestuffs of the formula (1) in which n, m, p, q, A, B and B' have the indicated meanings and X is methyl, methoxy, carboxyl or chlorine are preferred.

Important sub-groups of the fibre-reactive azo dyestuffs of the formula (1) are characterised as follows: (a) A is a naphth-2-yl radical, B is a benzene radical, n is 2 or 3, m is 0 and p is 0, (b) A is a benzene radical, B is a benzene radical, n is 1 or 2, m is 0 and p is 0, (c) A is a naphth-2-yl radical, B is a naphthalene radical, n is 2 or 3, m is 1 and p is 0, (d) A is a benzene radical, B is a benzene radical, B' is a naphthalene radical, n is 1 or 2, m is 0, p is 1 and q is 1, (e) A is a benzene radical, B is a naphthalene radical, B' is a naphthalene radical, n is 1 or 2, m is 1, p is 1 and q is 1 and (f) A is a naphthalene radical, B is a benzene radical, B' is a naphthalene radical, n is 2 or 3, m is 0, p is 1 and q is 1, and in all of the above cases (a) to (f) X is methyl, methoxy, carboxyl or chlorine.

Valuable fibre-reactive azo dyestuffs of the formula (1), sub-group (a), are fibre-reactive azo dyestuffs of the formula ##STR3## in which X is methyl, methoxy, carboxyl or chlorine.

The fibre-reactive azo dyestuff of the formula (2) in which X is methyl is of particular interest.

The dyestuffs of the formula (1) are fibre-reactive since they contain, in the s-triazine radical, a fluorine atom which can be split off.

Fibre-reactive compounds are to be understood as those which are able to react with the hydroxyl groups in cellulose or with the amino groups in natural or synthetic polyamides with the formation of covalent chemical bonds.

The manufacture of the fibre-reactive azo dyestuffs of the formula (1) is characterised in that an azo compound of the formula ##STR4## is subjected to a condensation reaction with 2,4,6-trifluoro-1,3,5-triazine of the formula ##STR5## and the resulting primary condensation product is subjected to a condensation reaction with an aminobenzene of the formula ##STR6## to give a fibre-reactive azo dyestuff of the formula (1).

An aminobenzene of the formula (5) in which X is methyl, methoxy, carboxyl or chlorine is preferably used as the starting material.

In preferred embodiments of the process described above, azo compounds of the formula (3), in which (a) A is a naphth-2-yl radical, B is a benzene radical, n is 2 or 3, m is 0 and p is 0, (b) A is a benzene radical, B is a benzene radical, n is 1 or 2, m is 0 and p is 0, (c) A is a naphth-2-yl radical, B is a naphthalene radical, n is 2 or 3, m is 1 and p is 0, (d) A is a benzene radical, B is a benzene radical, B' is a naphthalene radical, N is 1 or 2, m is 0, p is 1 and q is 1, (e) A is a benzene radical, B is a naphthalene radical, B' is a naphthalene radical, n is 1 or 2, m is 1, p is 1 and q is 1, or (f) A is a naphthalene radical, B is a benzene radical, B' is a naphthalene radical, n is 2 or 3, m is 0, p is 1 and q is 1, and aminobenzenes of the formula (5), in which X is methyl, methoxy, carboxyl or chlorine are used as the starting materials.

The valuable fibre-reactive azo dyestuffs of the formula (2) are obtained by subjecting an azo compound of the formula ##STR7## to a condensation reaction with 2,4,6-trifluoro-1,3,5-triazine of the formula (4) and subjecting the resulting primary condensation product to a condensation reaction with an aminobenzene of the formula (5) in which X is methyl, methoxy, carboxyl or chlorine to give a fibre-reactive azo dyestuff of the formula (2).

In particular, an aminobenzene of the formula (5) in which X is methyl is used as the starting material.

The azo compounds of the formula (3) which are used as starting materials for the manufacture of the fibre-reactive azo dyestuffs of the formula (1) are obtained by diazotising aminobenzenesulphonic acids or aminonaphthalenesulphonic acids and coupling the diazo compound with corresponding coupling components of the benzene or naphthalene series which contain a --NH.sub.2 group and optionally diazotising the resulting aminoazo compound and again coupling the diazo compound with a second coupling component of the benzene or naphthalene series which contains a --NH.sub.2 group.

As a rule, the diazotisation is effected by the action of nitrous acid in aqueous-mineral acid solution at a low temperature and coupling is effected at weakly acid or neutral to weakly alkaline pH values.

The following may be mentioned as diazo components and coupling components which can be used to manufacture the azo compounds of the formula (3):

Diazo components:

1-aminobenzene-2-, -3- and -4-sulphonic acid, 1-aminobenzene-2,4- and -2,5-disulphonic acid, 1-amino-4-methylbenzene-2-sulphonic acid, 1-amino-3-methylbenzene-6-sulphonic acid, 1-amino-6-methylbenzene-3- or -4-sulphonic acid, 1-amino-2,4-dimethylbenzene-6-sulphonic acid, 1-amino-4- or -5-chlorobenzene-2-sulphonic acid, 1-amino-6-chlorobenzene-3- or -4-sulphonic acid, 1-amino-3,4-dichlorobenzene-6-sulphonic acid, 1-amino-2,5-dichlorobenzene-4-sulphonic acid, 1-amino-4-methyl-5-chlorobenzene-2-sulphonic acid 1-amino-5-methyl-4-chlorobenzene-2-sulphonic acid, 1-amino-4- or -5-methoxybenzene-2-sulphonic acid, 1-amino-6-methoxybenzene-3- or -4-sulphonic acid, 1-amino-6-ethoxybenzene-3- or -4-sulphonic acid, 1-amino-2,4-dimethoxybenzene-6-sulphonic acid, 1-amino-2,5-dimethoxybenzene-4-sulphonic acid, 1-amino-3-acetylaminobenzene-6-sulphonic acid, 1-amino-4-acetylaminobenzene-2-sulphonic acid, 1-amino-3-acetylamino-4-methylbenzene-6-sulphonic acid, 1-aminonaphthalene-2-, -4-, -5-, -6-, -7- or -8 -sulphonic acid, 2-aminonaphthalene-1-, -5- or -6-sulphonic acid, 1-aminonaphthalene-3,6- or -5,7-disulphonic acid, 2-aminonaphthalene-1,5-, -1,7-, -3,6-, -5,7-, -4,8- or -6,8-disulphonic acid, 1-aminonaphthalene-2,5,7-trisulphonic acid and 2-aminonaphthalene-1,5,7-, -3,6,8- or -4,6,8-trisulphonic acid.

Coupling components:

Aminobenzene, N-methyl-, -ethyl- or -butyl-aminobenzene, 1-amino-2- or -3-methylbenzene, 1-methylamino-3-methylbenzene, 1-ethylamino-3-methylbenzene, 1-amino-2,5-dimethylbenzene, 1-amino-2,5-diethylbenzene, 1-amino-2- or -3-methoxybenzene, 1-amino-2- or -3-ethoxybenzene, 1-amino-2,5-dimethoxybenzene, 1-amino-2,5-diethoxybenzene, 1-amino-3-acetylaminobenzene, 1-amino-3-ureidobenzene, 1-amino-3-hydroxyacetylaminobenzene, 1-amino-3-sulphoacetylaminobenzene, 1-amino-3-methyl-6-methoxybenzene, 1-amino-3-acetylamino-6-methylbenzene, 1-amino-3-acetylamino-6-methoxybenzene, 1-amino-3-ureido-6-methylbenzene, 1-amino-2-methoxy-5-methylbenzene, 1-aminonaphthalene, 1-aminonaphthalene-6-, -7- or -8-sulphonic acid and 1-amino-2-methoxynaphthalene-6-sulphonic acid.

Further compounds which may be mentioned as starting materials for the manufacture of the fibre-reactive azo dyestuffs of the formula (1) are: 2,4,6-trifluoro-1,3,5-triazine (cyanuric fluoride) of the formula (4) and aminobenzenes of the formula (5), such as 1-amino-2-methyl-, -ethyl- or -propylbenzene, 1-amino-2-methoxy- or -ethoxy-benzene, 1-amino-2-carboxybenzene, 1-amino-2-chlorobenzene, 1-amino-2-bromobenzene and 1-amino-2-fluorobenzene.

The condensation reactions of 2,4,6-trifluoro-1,3,5-triazine with the azo compounds of the formula (3) and the aminobenzenes of the formula (5) are preferably carried out in aqueous solution or suspension, at a low temperature and at a weakly acid or neutral to weakly alkaline pH value. Advantageously, the hydrogen fluoride liberated during the condensation reaction is continuously neutralized by adding aqueous alkali metal hydroxides, alkali metal carbonates or alkali metal bicarbonates.

The fibre-reactive azo dyestuffs of the formula (1) are distinguished by a high reactivity and a high degree of fixation.

They are suitable for dyeing and printing very diverse materials, such as silk, leather, wool, high molecular weight polyamide fibres and high molecular weight polyurethanes, but especially cellulose-containing materials having a fibrous structure, such as linen, cellulose, regenerated cellulose and, above all, cotton. They are suitable both for the exhaustion process and for dyeing by the pad dyeing process, according to which the goods are impregnated with aqueous and, optionally, also salt-containing dyestuff solutions and the dyestuffs are fixed after an alkali treatment, or in the presence of alkali, optionally with the action of heat.

They are also suitable for printing, especially on cotton, but likewise also for printing nitrogen-containing fibres such as, for example, wool, silk or mixed fabrics containing wool.

It is advisable to subject the dyeings and prints to thorough rinsing with cold and hot water, optionally with the addition of an agent which has a dispersing action and promotes diffusion of amounts which have not been fixed.

In the examples which follow, the parts denote parts by weight and the temperatures are given in degrees centigrade.

EXAMPLE

61.1 parts of the aminoazo dyestuff of the formula ##STR8## are dissolved in 500 parts of water. 14 parts of 2,4,6-trifluoro-1,3,5-triazine are added dropwise in the course of 15 minutes at a temperature of 0.degree., a pH value of about 6 being maintained by adding 2N sodium hydroxide solution at the same time. 10.7 parts of 1-amino-2-methylbenzene are added all at once to the resulting solution, in which no further starting material can be detected, and the temperature is allowed to rise to 20.degree.. The acid liberated during the condensation reaction is neutralised by continuously adding sodium hydroxide solution at such a rate that a pH value of 7 to 8 is maintained. After the reaction hs ended, the dyestuff of the formula ##STR9## is precipitated by sprinkling in sodium chloride, filtered off and, after the addition of a phosphate buffer, dried. After grinding, this gives an orange dyestuff powder with which cotton is dyed from an aqueous bath in fast reddish-tinged yellow shades.

The dyestuff can also be isolated by evaporating or spray-drying the entire reaction mixture.

If equivalent amounts of 1-amino-2-chlorobenzene, 1-amino-2-methoxybenzene or 1-amino-2-carboxybenzene are used in place of 1-amino-2-methylbenzene, dyestuffs with similar dyeing properties are obtained.

If equivalent amounts of the aminoazo dyestuffs listed in the table which follows are used in place of the indicated aminoazo dyestuff, further valuable dyestuffs, which on cotton give dyeings of the indicated shade, are obtained in accordance with the instructions in the example.

__________________________________________________________________________Aminoazo dyestuff obtained from Colour shadeNo. Diazo component Coupling component on cotton__________________________________________________________________________1 1-aminobenzene-2,5- 1-amino-3-acetyl- yellow disulphonic acid aminobenzene2 2-aminonaphthalene-4,8- 1-amino-3-methylbenzene yellow disulphonic acid3 2-aminonaphthalene-5,7- 1-amino-3-ureidobenzene reddish-tinged disulphonic acid yellow4 2-aminonaphthalene-5,7- 1-amino-3-acetylamino- reddish-tinged disulphonic acid benzene yellow5 2-aminonaphthalene-4,8- 1-amino-3-acetylamino- reddish-tinged disulphonic acid benzene yellow6 2-aminonaphthalene-4,6,8- 1-amino-3-acetylamino- reddish-tinged trisulphonic acid benzene yellow7 2-aminonaphthalene-4,6,8- 1-amino-2-methoxy-5- reddish-tinged trisulphonic acid methylbenzene yellow8 2-aminonaphthalene-4,6,8- 1-amino-2,5-dimethyl- yellow trisulphonic acid benzene9 2-aminonaphthalene-4,6,8- 1-aminonaphthalene-6- reddish-tinged trisulphonic acid sulphonic acid yellow10 2-aminonaphthalene- 1-amino-3-ureido-6- reddish-tinged 3,6,8-trisulphonic acid methylbenzene yellow11 2-aminonaphthalene- 1-amino-3-ureidobenzene reddish-tinged 6,8-disulphonic acid yellow12 2-aminonaphthalene- 1-aminobenzene yellow 4,6,8-trisulphonic acid13 1-amino-2,5-dimethyl-4- 1-aminonaphthalene-8- orange (2',5'-disulphophenylazo)- sulphonic acid benzene14 1-amino-4-(2',5'-disulpho- 1-aminonaphthalene-7- orange phenylazo)-naphthalene-6- sulphonic acid sulphonic acid15 1-amino-2,5-dimethyl-4- 1-aminonaphthalene-6- brown (2',5',7'-trisulphonaphth- sulphonic acid 1'-ylazo)-benzene16 1-amino-2,5-dimethyl-4- 1-aminonaphthalene- brown (2',5',7'-trisulphonaphth- 7-sulphonic acid 1'-ylazo)-benzene17 1-amino-2,5-dimethoxy-4- 1-aminonaphthalene- brown (2',5'7'-trisulphonaphth- 6-sulphonic acid 1'-ylazo)-benzene18 1-amino-3-methyl-4-(4',8'- 1-amino-3-methylbenzene brownish-tinged disulphonaphth-2'-ylazo)- orange benzene19 1-amino-4-(4',6',8'-tri- aminobenzene orange sulphonaphth-2'-ylazo)- benzene20 1-amino-4-(2',5'-disulpho- 1-aminonaphthalene-8- brown phenylazo)-naphthalene-6- sulphonic acid sulphonic acid21 1-amino-4-(2',5'-disulpho- 1-aminonaphthalene-8- brown phenylazo)-naphthalene- sulphonic acid 6/7-sulphonic acid (mixture)22 4-aminoazobenzene-3,4'- 1-aminonaphthalene-6- brown disulphonic acid sulphonic acid__________________________________________________________________________

If 2,4,6-trifluoro-1,3,5-triazine is subjected to a condensation reaction, analogously to the instructions in the example, with the aminoazo compounds and aminobenzenes listed in the table which follows, further fibre-reactive azo dyestuffs of the formula (1), which dye cotton in yellow to brown shades, are obtained.

__________________________________________________________________________Aminoazo compound obtained fromDiazo component Coupling component Aminobenzene__________________________________________________________________________2-aminonaphthalene-4,8- 1-amino-2-methoxy-5-methylbenzene 1-amino-2-methylbenzenedisulphonic acid2-aminonaphthalene-4,8- " 1-amino-2-carboxybenzenedisulphonic acid1-aminonaphthalene-3,6- 1-amino-3-methylbenzene 1-amino-2-methylbenzenedisulphonic acid1-aminonaphthalene-3,6- " 1-amino-2-chlorobenzenedisulphonic acid2-aminonaphthalene-5,7- " 1-amino-2-methylbenzenedisulphonic acid2-aminonaphthalene-5,7- " 1-amino-2-ethylbenzenedisulphonic acid2-aminonaphthalene-6,8- " 1-amino-2-methylbenzenedisulphonic acid2-aminonaphthalene-6,8- " 1-amino-2-methoxybenzenedisulphonic acid4-aminoazobenzene-3,4'- " 1-amino-2-bromobenzenedisulphonic acid1-aminobenzene-4-sulphonic " 1-amino-2-methylbenzeneacid .fwdarw. 1-amino-naphthalene-6-sulphonic acid2-aminonaphthalene-4,8- 1-amino-3-methoxybenzene "disulphonic acid2-aminonaphthalene-4,8- 1-amino-3-acetylaminobenzene 1-amino-2-chlorobenzenedisulphonic acid2-aminonaphthalene-4,8- aminobenzene "disulphonic acid2-aminonaphthalene-1,5- 1-amino-3-methyl-6-methoxybenzene 1-amino-2-methylbenzenedisulphonic acid2-aminonaphthalene-1,5- 1-amino-3-methylbenzene "disulphonic acid2-aminonaphthalene-1,5- 1-aminonaphthalene-6-sulphonic acid 1-amino-2-chlorobenzenedisulphonic acid2-aminonaphthalene-1,5- 1-amino-3-acetylaminobenzene 1-amino-2-methoxybenzenedisulphonic acid2-aminonaphthalene-1,5- 3-aminophenylurea "disulphonic acid2-aminonaphthalene-1,5- 1-amino-3-hydroxyacetylaminobenzene "disulphonic acid2-aminonaphthalene-5,7- 1-amino-3-methyl-6-methoxybenzene 1-amino-2-chlorobenzenedisulphonic acid2-aminonaphthalene-5,7- 1-aminonaphthalene-7-sulphonic acid "disulphonic acid2-aminonaphthalene-5,7- 1-amino-3-acetylaminobenzene "disulphonic acid2-aminonaphthalene-5,7- 3-aminophenylurea "disulphonic acid2-aminonaphthalene-5,7- 1-amino-3-hydroxyacetylaminobenzene 1-amino-2-chlorobenzenedisulphonic acid1-aminonaphthalene-3,7- 1-amino-3-methyl-6-methoxybenzene 1-amino-2-methylbenzenedisulphonic acid1-aminonaphthalene-3,7- 1-amino-3-methylbenzene "disulphonic acid1-aminonaphthalene-3,7- 1-aminonaphthalene-6-sulphonic acid "disulphonic acid2-aminonaphthalene-3,6- 1-amino-3-methylbenzene "disulphonic acid2-aminonaphthalene-3,6- 1-amino-3-methyl-6-methoxybenzene "disulphonic acid2-aminonaphthalene-3,6- 1-amino-3-acetylaminobenzene 1-amino-2-methylbenzenedisulphonic acid2-aminonaphthalene-3,6- 3-aminophenylurea "disulphonic acid2-aminonaphthalene-3,6- 1-amino-3-hydroxyacetylaminobenzene "disulphonic acid2-aminonaphthalene-3,6- 1-aminonaphthalene-6-sulphonic acid "disulphonic acid2-aminonaphthalene-6,8- 1-amino-3-acetylaminobenzene "disulphonic acid2-aminonaphthalene-6,8- 1-amino-2-methoxynaphthalene-6- 1-amino-2-methylbenzenedisulphonic acid sulphonic acid2-aminonaphthalene-6,8- 1-aminonaphthalene-6-sulphonic acid "disulphonic acid2-aminonaphthalene-4,8- " "disulphonic acid2-aminonaphthalene-4,8- 1-aminonaphthalene-7-sulphonic acid "disulphonic acid2-aminonaphthalene-4,8- 1-amino-2-methoxynaphthalene-6- "disulphonic acid sulphonic acid2-aminonaphthalene-4,8- aminobenzene "disulphonic acid2-aminonaphthalene-4,8- 1-amino-3-ethylbenzene "disulphonic acid2-aminonaphthalene-4,8- aminobenzene 1-amino-2-carboxybenzenedisulphonic acid2-aminonaphthalene-4,8- 1-amino-2,5-dimethylbenzene 1-amino-2-bromobenzenedisulphonic acid2-aminonaphthalene-4,8- 1-amino-3-sulphoacetylaminobenzene 1-amino-2-fluorobenzenedisulphonic acid2-aminonaphthalene-4,8- 1-methylamino-3-methylbenzene 1-amino-2-ethylbenzenedisulphonic acid2-aminonaphthalene-3,6,8- aminobenzene 1-amino-2-methylbenzenetrisulphonic acid2-aminonaphthalene-3,6,8- 1-amino-3-methylbenzene 1-amino-2-methylbenzenetrisulphonic acid2-aminonaphthalene-3,6,8- 3-aminophenylurea 1-amino-2-methoxybenzenetrisulphonic acid2-aminonaphthalene-3,6,8- 1-amino-3-hydroxyacetylamino- "trisulphonic acid benzene2-aminonaphthalene-3,6,8- 1-amino-3-acetylamino-6-methoxy- 1-amino-2-methylbenzenetrisulphonic acid benzene2-aminonaphthalene-3,6,8- 1-amino-3-acetylamino-6-methyl- "trisulphonic acid benzene2-aminonaphthalene-3,6,8- 1-amino-3-methanesulphonylamino- 1-amino-2-propylbenzenetrisulphonic acid benzene2-aminonaphthalene-3,6,8- 1-amino-2,5-dimethoxybenzene 1-amino-2-methylbenzenetrisulphonic acid2-aminonaphthalene-3,6,8- 1-amino-3-methyl-6-methoxybenzene "trisulphonic acid2-aminonaphthalene-3,6,8- aminobenzene 1-amino-2-chlorobenzenetrisulphonic acid2-aminonaphthalene-3,6,8- " 1-amino-2-bromobenzenetrisulphonic acid2-aminonaphthalene-3,6,8- N--ethylaniline 1-amino-2-methoxybenzenetrisulphonic acid2-aminonaphthalene-3,6,8- 1-amino-3-acetylamino-6-methyl- 1-amino-2-fluorobenzenetrisulphonic acid benzene2-aminonaphthalene-3,6,8- 1-ethylamino-3-methylbenzene 1-amino-2-butylbenzenetrisulphonic acid2-aminonaphthalene-3,6,8- 1-amino-2-methylbenzene 1-amino-2-methylbenzenetrisulphonic acid2-aminonaphthalene-3,6,8- 1-amino-2,5-dimethylbenzene "trisulphonic acid2-aminonaphthalene-3,6,8- 1-amino-2-methoxybenzene "trisulphonic acid2-aminonaphthalene-3,6,8- 1-amino-3-methoxybenzene "trisulphonic acid2-aminonaphthalene-3,6,8- 1-amino-3-methoxybenzene 1-amino-2-methoxybenzenetrisulphonic acid2-aminonaphthalene-3,6,8- 1-aminonaphthalene-6-sulphonic 1-amino-2-methylbenzenetrisulphonic acid acid2-aminonaphthalene-3,6,8- 1-aminonaphthalene-7-sulphonic "trisulphonic acid acid2-aminonaphthalene-4,6,8- 1-amino-3-methylbenzene "trisulphonic acid2-aminonaphthalene-4,6,8- aminobenzene 1-amino-2-chlorobenzenetrisulphonic acid2-aminonaphthalene-4,6,8- " 1-amino-2-methoxybenzenetrisulphonic acid2-aminonaphthalene-4,6,8- 1-amino-3-acetylaminobenzene "trisulphonic acid1-aminonaphthalene-2,5,7- 1-amino-3-methylbenzene 1-amino-2-methylbenzenetrisulphonic acid1-aminonaphthalene-2,5,7- 1-aminonaphthalene-6-sulphonic acid "trisulphonic acid1-aminonaphthalene-2,5,7- 1-amino-3-acetylaminobenzene "trisulphonic acid1-aminonaphthalene-2,5,7- 3-aminophenylurea "trisulphonic acid1-aminonaphthalene-2,5,7- 1-amino-3-hydroxyacetylaminobenzene 1-amino-2-carboxybenzenetrisulphonic acid1-aminonaphthalene-2,5,7- aminobenzene 1-amino-2-methylbenzenetrisulphonic acid1-aminonaphthalene-2,5,7- " 1-amino-2-ethoxybenzenetrisulphonic acid1-aminonaphthalene-2,5,7- " 1-amino-2-propoxybenzenetrisulphonic acid1-aminonaphthalene-2,5,7- " 1-amino-2-carboxybenzenetrisulphonic acid1-aminonaphthalene-2,5,7- 1-amino-3-methylbenzene 1-amino-2-chlorobenzenetrisulphonic acidaniline-2,5-disulphonic 1-aminonaphthalene-6-sulphonic 1-amino-2-methylbenzeneacid acidaniline-2,5-disulphonic 1-aminonaphthalene-7-sulphonic "acid acidaniline-2,5-disulphonic 1-amino-3-methylbenzene 1-amino-2-methylbenzeneacidaniline-2,5-disulphonic 1-amino-3-acetylaminobenzene 1-amino-2-methoxybenzeneacidaniline-2,5-disulphonic 1-amino-2-methoxy-5-methylbenzene 1-amino-2-chlorobenzeneacidaniline-2,5-disulphonic 1-amino-2,5-dimethoxybenzene "acidaniline-2,4-disulphonic 1-amino-2-methoxy-5-methylbenzene 1-amino-2-methylbenzeneacid__________________________________________________________________________

Dyeing Instructions I

2 parts of the dyestuff obtained according to the example are dissolved in 100 parts of water with the addition of 0.5 part of sodium m-nitrobenzene sulphonate. A cotton fabric is impregnated with the resulting solution so that its weight increases by 75% and is then dried.

The fabric is then impregnated with a solution which is at 20.degree. and contains 5 grams of sodium hydroxide and 300 grams of sodium chloride per liter and squeezed off to an increase in weight of 75% and the dyeing is steamed for 30 seconds at 100.degree. to 101.degree., rinsed, soaped for a quarter of an hour in a 0.3% strength boiling solution of a non-ionic washing agent, rinsed and dried.

Dyeing Instructions II

2 parts of the dyestuff obtainable according to the example are dissolved in 100 parts of water.

The solution is added to 1,900 parts of cold water, 60 parts of sodium chloride are added and 100 parts of a cotton fabric are introduced into this dyebath.

The temperature is raised to 40.degree. and after 30 minutes 40 parts of calcined sodium carbonate and a further 60 parts of sodium chloride are added. The temperature is kept at 40.degree. for 30 minutes, the fabric is rinsed and the dyeing is then soaped for 15 minutes in a 0.3% strength boiling solution of a non-ionic washing agent, rinsed and dried.

Claims

1. A fibre-reactive azo dyestuff of the formula ##STR10## in which n is 2 or 3, and the benzene ring B is unsubstituted or substituted by alkyl of 1 to 4 carbon atoms, alkoxy of 1 to 4 carbon atoms, alkanoylamino of up to 6 carbon atoms, benzoylamino,

NH.sub.2, methylamino, ethylamino, ureido, hydroxy, carboxy or halogen and

X is methyl, methoxy, carboxyl or chlorine.

2. A fibre-reactive azo dyestuff according to claim 1 of the formula ##STR11## wherein X is methyl, methoxy, carboxyl or chlorine.

3. A fibre-reactive azo dyestuff according to claim 1, of the formula ##STR12## in which X is methyl, methoxy, carboxyl or chlorine.

4. The fibre-reactive azo dyestuff according to claim 3, in which X is methyl.