Azo dvestuffs This invention relates to novel azo dyes of the formula (I) where R, and R2 are independently H or-SO3H, X is a halogen atom, especially F or Cl, Y is an alkali-detachable group, especially-OS03H, Cl, Br,-OP03H2, -SSO3H,-OCOCH3,-OCOC6H5 or-OS02CH3 R3 is-NR4R5, where R4 and R5 are independently hydrogen, a linear or branched Cj. io-alkyi group which may additionally be interrupted by one or more identical or different heteroatoms or functional groups, especially by -O- and/or -SO2-, and which may optionally be substituted ; a phenyl group, which may optionally be substituted by one or more identical or different radicals, especially by C, 4-alkyl, preferably-CH3, -SO3H or -SO2-CH2CH2-Y, where Y is as defined above, or R4 and R5 may combine with the nitrogen to which they are bonded to form a C3-C8 ring which may additionally contain one or more identical or different heteroatoms, especially 0, S or N, preferably additionally an N or an 0, subject to the proviso that when R4 or R5 is an-SO2CH2CH2OS03H-substituted phenyl group, R is always-S03H, or R3 has the formula (Ia) where X, Y, R, and R2 are each as defined in the formula (I), R6 and R6'are independently H or a linear or branched Cz 6-alkyl group, preferably a linear C, 4- alkyl group, and B is a phenylene group or a linear or branched Cl lo-alkylene group, which may optionally be substituted, subject to the proviso that the position of the-NH-group on the naphthyl ring and the position of the-SO2 (CH2) 2-Y group on the phenyl ring are identical to those of the formula (I), and also mixtures thereof and their salts.

Useful cations for salt formation include in particular alkali metal or alkaline earth metal cations.

In preferred compounds of the formula (I), R3 is-NR4R5, where R4 and R5 are independently H, unsubstituted or HO-, HOOC-, H03S-, H03SO-or halogen-substituted-CH3 and-CH2CH3, linear C4 6-alkyl groups which are interrupted by-O-and/or S02-and which are additionally substituted by Y having the abovementioned meanings, preferably Cl or-OS03H ; or monosubstituted phenyl groups, substituted in particular by-CH3,-S03H or-S02CH2CH2Y, where Y is as defined above, preferably-OS03H, although in the latter case the abovementioned proviso again applies that R, is always-S03H.

In likewise preferred compounds of the formula (I), R3 has the formula (Ia) where R6 and R6'are independently H,-CH3 or-CH2CH3, B is a linear or branched C2-6-alkylene group or a phenylene group and X is F.

In particularly preferred compounds of the formula (I), R3 is-NR4R5, where NR4R5 is -NHCH3,-NHCH2CH3,-N (CH3) 2,-N (CH2CH3) 2,-NHCH2COOH,-NHCH2CH20H, -NHCH2CH2S03H,-NHCH2CH2OS03H,-N (CH3) CH2CH20H, -NHCH2CH2SO2CH2CH20S03H,-NHCH2CH2CH2SO2CH2CH2OS03H,<BR> ; -NHCH2CH20CH2CH2SO2CH2CH2C1, and Y is-OS03H.

In particularly preferred compounds of the formula I, R3 has the formula (Ia) where R6 and R6' are hydrogen, B is-CH2CH2-,-CH (CH3) CH2-,-CH2CH (CH3) CH2-,-CH2CH (CH3) CH2CH2CH2-, and Y is-OS03H.

In a likewise particularly preferred compound of the formula (I), R3 has the formula (Ia) where R6 is-CH3 and R6'is H, while B is-CH2CH2-and Y is-OS03H.

A likewise particularly preferred compound has the formula (Ib) where R5 is H or a substituted or unsubstituted C)-4-alkyt group and X is Cl or F.

A further aspect of the present invention is the synthesis of the compounds according to the invention, which comprises coupling a compound of the formula (II) with the diazo compound of an amine of the formula (III) where the substituents in the formula (II) and the substituents in the formula (III) are each as defined above, under generally known conditions.

This coupling takes place at a pH of 5-8, preferably 6-7. The reaction temperature is between 0 and 40°C, preferably between 10 and 30°C, particularly preferably between 20 and 30°C. The compounds according to the invention are isolated and aftertreated according to known methods.

The compounds of the formula (I) and mixtures thereof and their salts are reactive dyes ; they are useful for dyeing or printing hydroxyl-containing or nitrogenous organic substrates.

Another aspect of the invention is accordingly a process for dyeing or printing hydroxyl- containing or nitrogenous organic substrates, which comprises dyeing or printing with the above- defined compounds, their salts or mixtures.

Preferred substrates are leather and fiber materials comprising natural or synthetic polyamides and especially natural or regenerated cellulose, such as cotton, filament viscose or staple viscose.

The most preferred substrate is textile material comprising cotton.

Another aspect of the present invention is the use of the above-defined compounds, their salts or mixtures for dyeing or printing the above-described substrates.

The compounds of the formula (I) can be used in dyeing liquors or in print pastes according to all dyeing or printing methods customary for reactive dyes. Preferably they are dyed up by the exhaust method in the temperature range of 40 to 100°C.

The compounds of the invention can be used as individual dyes or else, because of their excellent compatibility, as combination elements with other reactive dyes of the same class possessing comparable dyeing properties, for example their general fastnesses, their exhaustion and fixation value, etc. The combination dyeings obtained have similar fastnesses to the dyeings with the individual dye.

The compounds of the formula (I) provide good exhaustion and fixation values. The unfixed dye portion is readily washed off. The dyeings and prints obtained possess good lightfastness. They also have good wetfastness properties.

The present invention also provides a hydroxyl-containing or nitrogenous organic substrate, especially cellulose, polyamides and animal fibers, preferably cotton or cotton-containing substrates, dyed or printed by the above-described dyeing or printing processes.

Also claimed is the use of the compound of the formula (I) or mixtures thereof or their salts as a component in an inkjet printing ink.

The examples hereinbelow serve to illustrate the invention.

Percentages and parts are by weight, unless otherwise stated. Temperatures are reported in degrees Celsius.

Example 1 23. 9 parts of 2-amino-8-hydroxynaphthalene-6-sulphonic acid are dissolved at 25°C in 400 parts of water under neutral conditions and the solution is cooled with 300 parts of ice to 0-5°C. At this temperature 13. 5 parts of 2, 4, 6-trifluorotriazine are added dropwise while the pH is maintained at 4. 0-4. 5 by metered addition of a 15% sodium carbonate solution. After subsequent stirring for about 5 min. 8. 7 parts of morpholine are added, while the pH is maintained at 7. 5-8. 0 by metered addition of 15% sodium carbonate solution. Stirring is then continued at 10°C until the reaction has ended. This provides a suspension of the reaction product of the formula (IV) This suspension is admixed with a diazonium salt solution prepared in conventional manner from 28. 1 parts of 4-aminophenyl 2'-sulphatoethyl sulphone and 25 parts by volume of 4 N sodium nitrite solution at 0-5°C while the pH is maintained at 6. 5-7. 0 by metered addition of 15% sodium carbonate solution. After the coupling has ended, the resulting dye of the formula (V) is salted out with sodium chloride, filtered off and dried at 50°C under reduced pressure. On cellulose material and especially on cotton it provides red dyeings having very good fastness properties and good stability to oxidative effects.

Examples 2-43 Tables 1 and 2 comprise dyes preparable from appropriate starting materials by the method described in Example 1. On cotton these dyes provide red or orange dyeings and prints having very good light-and wetfastnesses and are stable to oxidative effects.

Table 1/Examples 2 to 34 Ex. Pos. Pos. X R, R2 R3 Hue -SO2CH2--NH- CH2OSO3H 2 3 2 F H H-N red 3 4 3 F H H ditto orange 4 3 3 F H H dito orange 5 2 F H H-N HCH2CH20 H red 6 4 2 F H H-NHCH3 red 7 4 2 F H H-NHCH2CH3 red 8 4 2 F H H-N (CH3) 2 red 9 4 2 F H H-N (CH2CH3) 2 red 1042"F"HH-NHCHCOOHred ll 2 F H H-N HCH2CH2SO3H red 12 4 2 F H H-NHCH2CH20SO, H red 13 2 F H H-NHCH2CH2SO2CH2CH20SO3H red 14 4 2 F H H-NHCH2CH2CH2SO2CH2CH, OS03H red 15 2 F H H-N HCH2CH20CH2CH2SO2CH2CH2CI red 16 4 2 F H H-N (CH3) CH2CH20H red 17 so3H 4 2 F H H red N"'Cr H 18 4 3 Cl-S03H-S03H oso3H orange I \ Sv0 N H Ex. Pos. Pos. X R, R2 R3 Hue -SOZCHZ _ _ -S02CH2--NH- CHU H3c : o 19 4 2 F H H red Hic Ho H po 20 4 3 F-S03H-S03H X o-S03H red cCH3 /cl3 fez 21 4 3 C1-S03H-S03H, N, s orange o. so-SO, H 22 4 3 F H H-NHCH2CH2SO2CHCH2OSO3H orange 23 3 F H H-N HCH2CH2CH2S02CH2CH20S03H orange 24 4 3 F H H-N HCH2CH20CH2CH2S02CH2CH2CI orange 25 3 F H H-N HCH2CH2S03H orange 26 4 2 F-S03H H-N 0 red 27 4 2 Cl H H-N HCH2CH2S02CH2CH20S03H red 0 s 28 4 3 Cl-S03H-S03H I orange /p-SO3H N CH3 29 3 Cl-S03H-S03H dito orange 30 3 3 Cl-S03H-S03H ditto orange 31 4 3 Cl-S03H-S03H H \\"0 orange N su oNongS 32 3 3 Cl-S03H-S03H ditto orange 33 F H-S03H N HCH2CH2C H2S02CH2CH20S03H orange 34 2 Cl H-S03H dito red Table 2/Examples 35-43 Ex. Pos. Pos. Rl Hue -SO2CH2 CH2OS03H-NH- 35 4 2 H-NHCH2CH2NH-red 36 4 2-S03H ditto red 37 3 3 H-NHC (CH3) CH2NH-orange 38 2 H ditto red 39 4 3 H-NHCH2C (CH3) CH2 orange CH2CH2NH- 40 4 3 H-N (CH3) CH2CH2NH-orange 41 4 3 H HN NH orange 42 3 2 H ditto red HN NH 43 4 3 H orange Application Example A 0. 3 part of the dye of the formula (V) of Example 1 is dissolved in 100 parts of demineralized water and 8 parts of Glauber salt (calcined) are added. The dyebath is heated to 50°C and 10 parts of woven cotton fabric (bleached) are added. The temperature is maintained at 50°C during the addition of sodium carbonate. The dyebath is then heated to 60°C and the dyeing is continued at 60°C for one hour. The dyed fabric is then rinsed for 3 minutes with running cold water and then for 3 minutes with running hot water. The dyed fabric is then washed in boiling hot demineralized water for 15 minutes in the presence of 0. 25 part of Marseilles soap. After another 3 minute rinse with running hot water and a subsequent centrifugation, the dyed fabric is dried at 70°C in a drying cabinet. The result is a red dyeing having very good light-and wetfastnesses, which is stable to oxidative effects.

Application Example B The dyebath, which contains 100 parts of demineralized water and 5 parts of Glauber salt, is entered with 10 parts of woven cotton fabric (bleached).

The bath is heated to 50°C over 10 minutes and then 0. 5 part of the dye of the formula (V) of Example 1 is added. After a further 30 minutes at 50°C 1 part of sodium carbonate (calcined) is added. The dyebath is then heated to 60°C and the dyeing is continued at 60°C for a further 45 minutes.

The dyed fabric is rinsed first with running cold water and then with hot water and then washed as in Application Example A.

The result is a red dyeing having very good light-and wetfastnesses, which is stable to oxidative effects.

The method of Application Examples A and B may also be applied to the other examples of Tables 1 and 2 or mixtures thereof and/or their salts. The result in each case is a red or orange dyeing having very good light-and wetfastnesses, which is stable to oxidative influences.

Application Example C A print paste consisting of 40 parts of the dye of formula (V) of Example 1 100 parts of urea 350 parts of water 500 parts of 4% sodium alginate thickener and 10 parts of sodium carbonate 1000 parts in total is applied to woven cotton fabric by known methods. The printed fabric is dried and fixed in steam at 102-104°C for 4-8 minutes.

It is then rinsed first with cold water then with hot water. It is subsequently washed in boiling water as described in Application Example A and then dried. The result is a red dyeing having very good light-and wetfastnesses, which is stable to oxidative effects.

The method of Application Example C may also be applied to the other examples of Tables 1 and 2 or mixtures thereof and/or their salts. The result in each case is a red or orange dyeing having very good light-and wetfastnesses, which is stable to oxidative influences.

Application Example D 2. 5 parts of the dye of Example 1 of the formula (V) are stirred at 25°C into a mixture of 20 parts of diethylene glycol and 77. 5 parts of water. The result is a printing ink which is suitable for the inkjet printing process.

The method of Application Example D may also be applied to the other examples of Tables 1 and 2 or mixtures thereof and/or their salts.