Disperse azo dyestuffs

Abstract

The present invention claims dyestuffs of formula (I), wherein D, R1 to R7 and n are defined as given in claim 1, a process for their preparation and their use.

Description

The present invention relates to the field of disperse dyes.

Disperse dyestuffs containing cyanomethyl ester groups are known from literature and are described for example in GB 909,843, DE-A 2130992, GB 1,457,532, GB 1,536,429, FR-A 1,531,147, U.S. Pat. No. 3,776,898, JP 55161857, GB 2,104,088, EP 0 685 531 A1 and WO 95/20014.

The inventor of the present invention has surprisingly found that dyeings on polyester with very good wet fastness properties can be obtained if selected dyestuffs containing one cyanomethylester group as defined below are used.

The present invention claims dyestuffs of the formula I wherein D is a group of the formula (IIa)

• • wherein
  • T¹, T² and T³ are, independently, hydrogen, halogen or nitro;
  • T⁴ is hydrogen, halogen, cyano or nitro;
  • wherein at least one of T¹, T², T³ and T⁴ is not hydrogen; or a group of the formula (IIb)
  • wherein
  • T⁵ is hydrogen or halogen; and
  • T⁶ is hydrogen —SO₂CH₃, —SCN or nitro;
  • wherein at least one of T⁵ and T⁶ is not hydrogen; or a group of the formula (IIc) or a group of the formula (IId)
  • wherein
  • T⁷ is nitro, —CHO or a group of the formula wherein T¹⁰ is —H, halogen, nitro and cyano;
  • T⁸ is hydrogen or halogen; and
  • T⁹ is nitro, cyano, —COCH₃ or —COOT¹⁰, wherein T¹⁰ is (C₁-C₄)-alkyl; or a group of the formula (IIe) R¹ is hydrogen, (C₁-C₄)-alkyl or —NCOR⁶, where R⁶ is (C₁-C₄)-alkyl or phenyl; R² is unsubstituted (C₁-C₆)-alkyl, substituted (C₁-C₆)-alkyl, benzyl or phenylethyl; R³ is hydrogen or methyl; R⁴ is hydrogen or methyl; R⁵ is hydrogen, methyl or phenyl; R⁷ is hydrogen, chloro, methoxy or ethoxy; n is 0, 1 or 2; s is 0 or 1; with the proviso that in the case R¹, R³, R⁴, R⁵ and R⁷ are hydrogen and n=0 D is a group of the formula (IIc), (IId), (IIe) or (IIa) wherein T¹ is not nitro
  • if T², T³ and T⁴ are hydrogen,
  • if T² and T³ are hydrogen and T⁴ is chlorine or cyano and
  • if T² and T⁴ are hydrogen and T³ is chlorine; and with the further proviso that R² is unsubstituted (C₁-C₆)-alkyl if R¹ is methyl, R³, R⁴, R⁵ and R⁷ are hydrogen and n=0.

Alkyl groups standing for R¹, R⁸ or T¹⁰ may be straight-chain or branched and are preferably methyl, ethyl, n-propyl, i-propyl or n-butyl. The same applies to alkyl groups standing for R², which can in addition be pentyl or hexyl. Substituted alkyl groups standing for R² are preferably substituted by hydroxyl, (C₁-C₄)-alkoxy or halogen.

Halogen standing for T¹, T², T³, T⁴, T⁵ or T⁸ are preferably chlorine or bromine.

Preferred examples for D derive from the following amines:

2-nitroaniline, 3-nitroaniline, 4-nitroaniline, 2-chloro-4-nitroaniline, 4-chloro-2-nitroaniline, 2-bromo-4-nitroaniline, 2,6-dichloro-4-nitroaniline, 2,6-dibromo-4-nitroaniline, 2-chloro-6-bromo-4-nitroaniline, 2,5-dichloro-4-nitroaniline, 2-cyano-4-nitroaniline, 2-cyano-6-bromo-4-nitroaniline, 2-cyano-6-chloro-4-nitroaniline, 2,4-dinitroaniline, 2-chloro-4,6-dinitroaniline, 2-bromo-4,6-dinitroaniline, 2,6-dicyano-4-nitroaniline, 2-cyano-4,6-dinitroaniline, 2-amino-5-nitrothiazole, 2-amino-3,5-dinitrothiophene, 2-amino-3-ethoxycarbonyl-5-nitrothiophene, 2-amino-3-acetyl-5-nitrothiophene, 2-amino-3-cyano-5-nitrothiophene, 2-amino-3-cyano-4-chloro-5-formylthiophene, 7-amino-5-nitrobenzoisothiazole, 2-amino-6-nitrobenzothiazole, 2-amino-6-methylsulphonylbenzothiazole; 2-amino-6-thiocyanatobenzothiazole, 2-amino-5,6-dichlorobenzothiazole and 2-amino-6,7-dichlorobenzothiazole (mixture).

Preferred disperse dyestuffs according to the present invention are of the general formula (Ia) wherein D is a group of the formulae (IIa), (IIb), (IIc), (IId) or (IIe); R¹ is (C₁-C₄)-alkyl; R² is unsubstituted (C₁-C₆)-alkyl, benzyl or phenylethyl; and n is 0, 1 or 2.

In especially preferred dyestuffs of formula (Ia) R¹ is methyl, R² is ethyl and n is 0.

Other preferred disperse dyestuffs according to the present invention are of the general formula (Ib) wherein T³ is bromo or chloro; and R² is unsubstituted (C₁-C₈)-alkyl, substituted (C₁-C₆)-alkyl, benzyl or phenylethyl;

In especially preferred dyestuffs of formula (Ib) R² is ethyl, benzyl or phenethyl.

Still other preferred disperse dyestuffs according to the present invention are of the general formula (Ic) wherein D is a group of the formulae (IIa), (IIb), (IIc), (IId) or (IIe); R¹ is hydrogen, (C₁-C₄)-alkyl or —NCOR⁶, where R⁶ is (C₁-C₄)-alkyl or phenyl; R² is unsubstituted (C₁-C₈)-alkyl, substituted (C₁-C₈)-alkyl, benzyl or phenylethyl; and R³ is hydrogen and R⁴ is methyl or R³ is methyl and R⁴ is hydrogen.

Still other preferred disperse dyestuffs according to the present invention are of the general formula (Id) wherein D is a group of the formulae (IIa), (IIb), (IIc), (IId) or (IIe); R¹ is hydrogen, (C₁-C₄)-alkyl or —NCOR⁶, where R⁶ is (C₁-C₄)-alkyl or phenyl; R² is unsubstituted (C₁-C₆)-alkyl, substituted (C₁-C₆)-alkyl, benzyl or phenylethyl; and R⁵ is methyl or phenyl;

Still other preferred disperse dyestuffs according to the present invention are of the general formula (Ie) wherein D is a group of the formulae (IIa), (IIb), (IIc), (IId) or (IIe); R² is unsubstituted (C₁-C₆)-alkyl, substituted (C₁-C₆)-alkyl, benzyl or phenylethyl; R⁶ is (C₁-C₄)-alkyl or phenyl; R⁷ is chloro, methoxy or ethoxy; and n is 0, 1 or 2.

Still other preferred disperse dyestuffs according to the present invention are of the general formula (If) wherein R² is unsubstituted (C₁-C₆)-alkyl, substituted (C₁-C₆)-alkyl, benzyl or phenylethyl; R⁸ is nitro; and n is 0, 1 or 2;

Still other preferred disperse dyestuffs according to the present invention are of the general formula (Ig) wherein D is a group of the formulae (IIa), (IIb), (IIc), (IId) or (IIe); R¹ is hydrogen, (C₁-C₄)-alkyl or —NCOR⁶, where R⁶ is (C₁-C₄)-allyl or phenyl; R² is unsubstituted (C₁-C₆)-alkyl, substituted (C₁-C₆)-alkyl, benzyl or phenylethyl; and R³ is hydrogen or methyl.

The compounds of the formula I may be obtained by usual methods for the preparation of azo compounds such as by diazotisation of an amine of the formula III D—NH₂  (III) wherein D is defined as given above, and coupling onto a compound of the formula IV wherein R¹, R², R³, R⁴, R⁵ and R⁷ are defined as given above.

Typically the amine of the formula (III) may be diazotised in an acidic medium, such as acetic, propionic or hydrochloric acid using a nitrosating agent such as nitrosylsulphuric acid, sodium nitrite or methylnitrite at a temperature from −10° C. to 10° C. Coupling onto the compound of the formula (IV) may be achieved by adding the diazotised amine to the compound of the formula (IV) under conditions described in literature and known to the skilled persons. After coupling the compound of the formula (I) may be recovered from the reaction mixture by any convenient means such as filtration. The compounds of the formulae (III) and (IV) are known and can be obtained by methods described in literature or known to the skilled person.

The compounds of the formula (I) are useful for dyeing and printing of synthetic textile material particularly polyester textile materials and fibre blends thereof with for example cellulosic materials like cotton, to which they impart colours which have excellent wet fastness properties.

Dyeing of the fibre goods mentioned with the dyestuffs of the formula (I) can be carried out in a manner known per se, preferably from aqueous dispersions, if appropriate in the presence of carriers, at between 80 and 110° C., by the exhaust process or by the HT process in a dyeing autoclave at 110 to 140° C., and by the so-called thermofixing process, in which the goods are padded with the dye liquor and then fixed at about 180 to 230° C.

The fibre goods mentioned can as well be printed in a manner known per se by a procedure in which the dyestuffs of the formula (I) are incorporated into a printing paste and the goods printed with the paste are treated, if appropriate in the presence of a carrier, with HT steam, pressurized steam or dry heat at temperatures between 180 and 230° C. to fix the dyestuff.

The dyestuffs of the formula (I) should be present in the finest possible dispersion in the dye liquors and printing pastes employed in the above applications.

The fine dispersion of the dyestuffs is effected in a manner known per se by a procedure in which the dyestuff obtained during preparation is suspended in a liquid medium, preferably in water, together with dispersing agents and the mixture is exposed to the action of shearing forces, the particles originally present being comminuted mechanically to the extent that an optimum specific surface area is achieved and sedimentation of the dyestuff is as low as possible. The particle size of the dyestuffs is in general between 0.5 and 5 m, preferably about 1 m.

The dispersing agents used can be nonionic or anionic. Nononic dispersing agents are, for example, reaction products of alkylene oxides, such as, for example, ethylene oxide or propylene oxide, with alkylatable compounds, such as for example fatty alcohols, fatty amines, fatty acids, phenols, alkylphenols and carboxylic acid amines. Anionic dispersing agnets are, for example, lignin-sulphonates, alkyl- or alkylarylsulphonates or alkylaryl polyglycol ethersulphates. For most methods of use, the dyestuff formulations thus obtained should be pourable. The dyestuff and dispersing agent content is therefore limited in these cases. In general, the dispersions are brought to a dyestuff content of up to 50 percent by weight and a dispersing agent content of up to 25 percent by weight. For economic reasons, the dyestuff contents usually do not fall below 15 percent by weight.

The dispersions can also comprise other auxiliaries, for example those which act as oxidizing agents or fungicidal agents. Such agents are well known in the art. The dyestuff dispersion thus obtained can be used very advantageously for the preparation of printing pastes and dye liquors.

For certain fields of use, powder formulations are preferred. These powders comprise the dyestuff, dispersing agents and other auxiliaries, such as, for example, wetting agents, oxidizing agents, preservatives and dust removal agents.

A preferred preparation process for pulverulent dyestuff formulations comprises removing the liquid from the liquid dyestuff dispersions described above, for example by vacuum drying, freeze drying, by drying on roller dryers, but preferably by spray drying.

EXAMPLE 1

4-(4-nitrophenylazo)-3-methyl-N-ethyl-N-(2-cyanomethoxy-carbonylethyl) aniline

4-nitroaniline (4.1 parts) was set stirring at 5° C. with a mixture of acetic acid and propionic acid, 86:14 (50 parts). Nitrosyl sulphuric acid 40% (11.4 parts) was added below 5° C. and the mixture was stirred for 30 minutes.

The diazo solution obtained was added gradually to a stirred coupling mixture of N-ethyl, N-(2-cyanomethoxycarbonylethyl)-m-toluidine (7.3 parts), methanol (50 parts), water (200 parts) and sulphamic acid (1 part). After two hours the product was isolated by filtration, washed with cold water and dried to yield, 4-(4-nitrophenylazo)-3-methyl-N-ethyl-N-(2-cyanomethoxycarbonylethyl) aniline (6.5 parts) λmax=486 nm (acetone)

When applied to polyester materials from aqueous dispersion, red shades with excellent wet and light fastness properties were seen.

The following examples of dyes of formula (Iaa):

were prepared by the procedure of Example 1 (see Table 1)

TABLE 1
						λmax
Example	T11	T12	T13	T14	R8	(nm)
2	—H	—H	—NO2	—H	—C2H5	479
3	—H	—NO2	—H	—H	—C2H5	468
4	—NO2	—H	—Cl	—H	—C2H5	508
5	—Cl	—H	—NO2	—H	—C2H5	501
6	—NO2	—H	—Br	—H	—C2H5	507
7	—NO2	—H	—Cl	—Cl	—C2H5	450
8	—NO2	—H	—Br	—Br	—C2H5	449
9	—NO2	—H	—Cl	—Br	—C2H5	449
10	—NO2	—Cl	—H	—Cl	—C2H5	518
11	—NO2	—H	—CN	—H	—C2H5	534
12	—NO2	—H	—CN	—Br	—C2H5	544
13	—NO2	—H	—CN	—Cl	—C2H5	545
14	—NO2	—H	—NO2	—H	—C2H5	535
15	—NO2	—H	—Br	—NO2	—C2H5	542
16	—NO2	—H	—Cl	—NO2	—C2H5	544
17	—NO2	—H	—CN	—CN	—C2H5	582
18	—NO2	—H	—CN	—NO2	—C2H5	590
19	—NO2	—H	—H	—H	—C4H9	490
20	—NO2	—H	—Cl	—H	—C4H9	513
21	—NO2	—H	—Cl	—Cl	—C4H9	453
22	—NO2	—H	—Cl	—Br	—C4H9	453
23	—NO2	—H	—Br	—Br	—C4H9	452
24	—NO2	—H	—CN	—H	—C4H9	539
25	—NO2	—H	—NO2	—H	—C4H9	540
26	—NO2	—H	—CN	—Br	—C4H9	549
27	—NO2	—H	—CN	—Cl	—C4H9	548
28	—NO2	—H	—Br	—NO2	—C4H9	548
29	—NO2	—H	—Cl	—NO2	—C4H9	549
30	—H	—H	—NO2	—H	—C4H9	483
31	—NO2	—H	—CN	—CN	—C4H9	586
32	—NO2	—H	—H	—H	—CH2[C6H5]	479
33	—NO2	—H	—NO2	—H	—CH2[C6H5]	530
34	—H	—H	—NO2	—H	—CH2[C6H5]	470
35	—H	—NO2	—H	—H	—CH2[C6H5]	460
36	—NO2	—H	—Cl	—H	—CH2[C6H5]	498
37	—NO2	—H	—Cl	—Cl	—CH2[C6H5]	446
38	—NO2	—H	—Br	—Br	—CH2[C6H5]	445
39	—NO2	—H	—Br	—Cl	—CH2[C6H5]	444
40	—NO2	—H	—CN	—H	—CH2[C6H5]	528
41	—NO2	—H	—CN	—Br	—CH2[C6H5]	539
42	—NO2	—H	—CN	—Cl	—CH2[C6H5]	539
43	—NO2	—H	—Br	—NO2	—CH2[C6H5]	538
44	—NO2	—H	—Cl	—NO2	—CH2[C6H5]	537
45	—NO2	—H	—CN	—NO2	—CH2[C6H5]	580
46	—NO2	—H	—CN	—CN	—CH2[C6H5]	577
47	—NO2	—H	—H	—H	—C3H7	487
48	—NO2	—H	—Cl	—H	—C3H7	509
49	—NO2	—H	—Cl	—Cl	—C3H7	452
50	—NO2	—H	—Cl	—Br	—C3H7	451
51	—NO2	—H	—Br	—Br	—C3H7	452
52	—NO2	—H	—CN	—H	—C3H7	536
53	—NO2	—H	—NO2	—H	—C3H7	537
54	—NO2	—H	—CN	—Br	—C3H7	546
55	—NO2	—H	—CN	—Cl	—C3H7	548
56	—NO2	—H	—Br	—NO2	—C3H7	544
57	—NO2	—H	—Cl	—NO2	—C3H7	545
58	—H	—H	—NO2	—H	—C3H7	480
59	—NO2	—H	—CN	—CN	—C3H7	584
60	—NO2	—H	—Cl	—H	—CH3	504
61	—NO2	—H	—CN	—H	—CH3	529
62	—NO2	—H	—Cl	—CN	—CH3	543
63	—NO2	—H	—Br	—CN	—CH3	542
64	—NO2	—H	—Br	—NO2	—CH3	539

EXAMPLE 65

4-(2,6-dichloro-4-nitrophenylazo)-N-ethyl-N-(2-cyanomethoxy-carbonylethyl) aniline

2,6-dichloro-4-nitroaniline (6.2 parts) was set stirring at 5° C. with a mixture of acetic acid and propionic acid, 86:14 (40 parts). Nitrosyl sulphuric acid 40% (11.4 parts) was added below 5° C. and the mixture was stirred for 30 minutes. The diazo solution was added gradually to a stirred coupling mixture of N-ethyl, N-2(cyanomethoxycarbonylethyl)-aniline (8.3 parts), methanol (50 parts), water (300 parts) and sulphamic acid (1 part). After one hour the product was isolated by filtration, washed with cold water and dried to yield, 4-(2,6-dichloro-4-nitrophenylazo)-N-ethyl-N-(2-cyanomethoxycarbonylethyl) aniline (9.5 parts) λmax=432 nm (acetone)

When applied to polyester materials from aqueous dispersion, yellow brown shades with excellent wet and light fastness properties were seen.

The following examples of dyes of Formula (Iba)

were prepared by the procedure of Example 65 (see Table 2)

TABLE 2
				λmax
Example	T15	T16	R9	(nm)
66	—Cl	—Cl	—C3H7	433
67	—Cl	—Cl	—C4H9	434
68	—Cl	—Cl	—CH2[C6H5]	420
69	—Cl	—Cl	—CH3	425
70	—Cl	—Br	—C2H5	430
71	—Cl	—Br	—C3H7	431
72	—Cl	—Br	—C4H9	433
73	—Cl	—Br	—CH2[C6H5]	420
74	—Cl	—Br	—CH3	424
75	—Br	—Br	—C2H5	430
76	—Br	—Br	—C3H7	432
77	—Br	—Br	—C4H9	431
78	—Br	—Br	—CH2[C6H5]	421
79	—Br	—Br	—CH3	424

EXAMPLE 80

4-(6-nitrobenzothiazol-yl-azo)-3-methyl-N-ethyl-N-(2-cyanomethoxycarbonylethyl) aniline

2-amino-6-nitrobenzothiazole (3.9 parts) was set stirring at 5° C. with a mixture of acetic acid and propionic acid, 86:14 (40 parts). Nitrosyl sulphuric acid 40% (7.6 parts) was added below 5° C. and the mixture was stirred for 1 hour. The diazo solution was added gradually to a stirred coupling mixture of N-ethyl, N-(2-cyanomethoxycarbonylethyl)-m-toluidine (5.9 parts), methanol (25 parts), water (200 parts) and sulphamic acid (0.5 parts). After one hour the product was isolated by filtration, washed with cold water and dried to yield, 4-(6-nitrobenzothiazol-yl-azo)-3-methyl-N-ethyl-N-(2-cyanomethoxycarbonyl ethyl) aniline (2.4 parts) λmax=545 nm (acetone)

When applied to polyester materials from aqueous dispersion, rubine shades with excellent wet and light fastness properties were seen.

The following examples of dyes of Formula (Iab):

were prepared by the procedure of Example 80 (see Table 3)

TABLE 3
Example	T17	T18	R10	R11	λmax nm
81	—SO2CH3	—H	—CH3	—CH3	527
82	—NO2	—H	—CH3	—CH3	543
83	—NO2	—H	—CH3	—C3H7	545
84	—NO2	—H	—CH3	—C4H9	548
85	—NO2	—H	—CH3	—CH2[C6H5]	538
86	—Cl	—Cl	—CH3	—C2H5	526
87	—Cl	—Cl	—CH3	—CH3	522
88	—Cl	—Cl	—CH3	—C3H7	528
89	—Cl	—Cl	—CH3	—C4H9	530
90	—Cl	—Cl	—CH3	—CH2[C6H5]	521
91	—SO2CH3	—H	—CH3	—C3H7	531
92	—SO2CH3	—H	—CH3	—C4H9	533
93	—SO2CH3	—H	—CH3	—CH2[C6H5]	525
94	—SCN	—H	—CH3	—C2H5	534
95	—SCN	—H	—CH3	—CH3	530
96	—SCN	—H	—CH3	—C3H7	535
97	—SCN	—H	—CH3	—C4H9	537
98	—SCN	—H	—CH3	—CH2[C6H5]	529
99	—NO2	—H	—H	—C4H9	535
100	—NO2	—H	—H	—CH2[C6H5]	525
101	—SCN	—H	—H	—C4H9	523
102	—SCN	—H	—H	—CH2[C6H5]	516
103	—Cl	—Cl	—H	—C4H9	519
104	—Cl	—Cl	—H	—CH2[C6H5]	509
105	—SO2CH3	—H	—H	—C4H9	521
106	—SO2CH3	—H	—H	—CH2[C6H5]	512

EXAMPLE 107

4-(3,5-dinitrothiophen-yl-azo)-3-methyl-N-ethyl-N-(2-cyanomethoxycarbonylethyl)

2-amino-3,5-dinitrothiophene (3.1 parts) was set stirring at 5° C. with a mixture of acetic acid and propionic acid, 86:14 (50 parts) Nitrosyl sulphuric acid 40% (5.7 parts) was added below 5° C. and the mixture was stirred for 30 mins. The diazo solution was added gradually to a stirred coupling mixture of N-ethyl, N-(2-cyanomethoxycarbonyethyl)-m-toluidine (4.0 parts), acetone (50 parts), water (300 parts) and sulphamic acid (0.5 parts). After one hour the product was isolated by filtration, washed with cold water and dried to yield, 4-(3,5-dinitrothiophen-yl-azo)-3-methyl-N-ethyl-N-(2-cyanomethoxycarbonyl-ethyl) aniline (3.0 parts) λmax=640 nm (acetone)

When applied to polyester materials from aqueous dispersion, blue shades with excellent wet and light fastness properties were seen.

The following examples of dyes of Formula (Iac):

were prepared by the procedure of Example 107 (see Table 4)

TABLE 4
Ex-						λmax
ample	T19	T20	T21	R12	R13	(nm)
108	—NO2	—NO2	—H	—H	—C2H5	620
109	—NO2	—NO2	—H	—H	—C4H9	625
110	—NO2	—NO2	—H	—H	—C3H7	622
111	—NO2	—NO2	—H	—H	—CH2[C6H5]	611
112	—NO2	—NO2	—H	—CH3	—C4H9	645
113	—NO2	—NO2	—H	—CH3	—C3H7	640
114	—NO2	—NO2	—H	—CH3	—CH2[C6H5]	632
115	—COOC2H5	—NO2	—H	—CH3	—C2H5	595
116	—COOC2H5	—NO2	—H	—H	—C4H9	583
117	—COCH3	—NO2	—H	—CH3	—C2H5	599
118	—COCH3	—NO2	—H	—CH3	—C4H9	603
119	—COCH3	—NO2	—H	—H	—C4H9	585
120	—CN	—NO2	—H	—CH3	—C2H5	604
121	—CN	—NO2	—H	—CH3	—CH2[C6H5]	595
122	—CN	—CHO	—Cl	—CH3	—C2H5	585
123	—CN	—CHO	—Cl	—CH3	—C4H9	591
124	—CN	—CHO	—Cl	—H	—C4H9	579
125	—COOC2H5	—NO2	—H	—H	—CH2[C6H5]	565
126	—COOC2H5	—NO2	—H	—CH3	—C4H9	601

EXAMPLE 127

4-(5-nitrobenzisothiazol-yl-azo)-3-methyl-N-ethyl-N-(2-cyanomethoxycarbonylethyl) aniline

7-amino-5-nitrobenzoisothiazole (2.9 parts) was added to a mixture of sulphuric acid 98% (15 parts) and phosphoric acid (4 parts) stirring at room temperature. The mixture was heated to 55° C. and was stirred at that temperature for 30 mins. Nitrosyl sulphuric acid 40% (6.1 parts) was added below 5° C. and the mixture was stirred for 2 hrs.

The diazo solution was added gradually to a stirred coupling mixture of N-ethyl, N-(2-cyanomethoxycarbonylethyl)-m-toluidine (4.8 parts), acetone (50 parts), water (100 parts) and sulphamic acid (0.5 parts). Sodium acetate was added to increase the pH to 4.0 and the mixture was stirred for 1 hour. The product was isolated by filtration, washed with cold water and dried to yield, 4-(5-nitrobenzisothiazol-yl-azo)-3-methyl-N-ethyl-N-(2-cyanomethoxycarbonylethyl) aniline (2.4 parts) λmax=601 nm (acetone)

When applied to polyester materials from aqueous dispersion, blue shades with excellent wet and light fastness properties were seen.

The following examples of dyes of Formula (Iad)

were prepared by the procedure of Example 127 (see Table 5)

TABLE 5
			λmax
Example	R14	R15	(nm)
128	—H	—C2H5	588
129	—H	—CH2[C6H5]	578
130	—H	—C4H9	589
131	—CH3	—C3H7	603
132	—CH3	—CH2[C6H5]	593
133	—CH3	—C4H9	608

EXAMPLE 134

4-(5-nitrothiazol-yl-azo)-N-butyl-N-(2-cyanomethoxy- carbonylethyl) aniline

2-amino-5-nitrothiazole (2.9 parts) was set stirring at 5° C. with a mixture of acetic acid, 86:14 (50 parts). Nitrosyl sulphuric acid 40% (7.0 parts) was added below 5° C. and the mixture was stirred for 30 mins. The diazo solution was added gradually to a stirred coupling mixture of N-butyl, N-2(cyanomethoxycarbonylethyl)-aniline (5.2 parts), acetone (50 parts), water (200 parts) and sulphamic acid (0.5 parts). After one hour the product was isolated by filtration, washed with cold water and dried to yield, 4-(5-nitrothiazol-yl-azo)-N-butyl-N-(2-cyanomethoxycarbonylethyl) aniline (2.9 parts) λmax=571 nm (acetone)

When applied to polyester materials from aqueous dispersion, blue shades with excellent wet and light fastness properties were seen.

The following examples of dyes of Formula (Iae)

were prepared by the procedure of Example 134 (see Table 6)

TABLE 6
			λmax
Example	R16	R17	(nm)
135	—H	—CH2[C6H5]	557
136	—CH3	—C2H5	575
137	—CH3	—C4H9	582
138	—CH3	—CH2[C6H5]	569

EXAMPLE 139

4(2-chloro-4-nitrophenylazo)-3-acetylamino-N-ethyl-N-(2-cyanomethoxycarbonylethyl)-aniline

2-chloro-4-nitroaniline (3.5 parts) was set stirring at 5° C. with a mixture of acetic acid and propionic acid, 86:14 (40 parts). Nitrosyl sulphuric acid 40% (7.0 parts) was added below 5° C. and the mixture was stirred for 30 minutes. The diazo solution was added gradually to a stirred coupling mixture of 3(N-ethyl, N-cyanomethoxycarbonylethyl)-amino-acetanilide (6.3 parts), methanol (40 parts), water (200 parts) and sulphamic acid (1 part). After two hours the product was isolated by filtration, washed with cold water and dried to yield, 4-(2-chloro-4-nitrophenylazo)-3-acetylamino-N-ethyl-N-(2-cyanomethoxy-carbonylethyl)-aniline (4.1 parts) λmax=525 nm (acetone)

When applied to polyester materials from aqueous dispersion, rubine shades with excellent wet and light fastness properties were seen.

The following examples of dyes of formula (Iea):

were prepared by the procedure of Example 139 (see Table 7)

TABLE 7
					λmax
Example	D′	R18	R19	R20	(nm)
140		—CH3	—H	—C2H5	550
141			—H	—C2H5	553
142		—CH3	—H	—C4H9	552
143		—C2H5	—H	—C2H5	550
144		—CH3	—OCH3	—C2H5	596
145		—CH3	—OCH3	—C4H9	603
146			—OCH3	—H	600
147		—C2H5	—OCH3	—C2H5	596
148		—CH3	—H	—C4H9	551
149		—CH3	—H	—C2H5	574
150		—C2H5	—H	—C2H5	550
151		—CH3	—H	—C4H9	525
152		—CH3	—OCH3	—C2H5	628 check
153		—CH3	—H	—C2H5	539
154		—CH3	—OCH3	—C2H5	574
155		—CH3	—H	—C2H5	634
156		—CH3	—OCH3	—C2H5	660

EXAMPLE 157

4-(2-cyano-4-nitrophenylazo)-3-methyl-N-ethyl-N-(4-cyanomethoxycarbonylbutyl)-aniline

2-cyano-4-nitroaniline (3.2 parts) was set stirring at 5° C. with a mixture of acetic acid and propionic acid, 86:14 (50 parts). Nitrosyl sulphuric acid 40% (7.6 parts) was added below 5° C. and the mixture was stirred for 30 minutes.

The diazo solution was added gradually to a stirred coupling mixture of N-ethyl, N-(4-cyanomethoxycarbonylbutyl)-m-toluidine (6.0 parts), methanol (50 parts), water (200 parts) and sulphamic acid (1 part). After two hours the product was isolated by filtration, washed with cold water and dried to yield, 4-(2-cyano-4-nitrophenylazo)-3-methyl-N-ethyl-N-(4-cyanomethoxycarbonyl butyl)-aniline.

(5.3 parts) λmax=548 nm (acetone)

When applied to polyester materials from aqueous dispersion, rubine shades with excellent wet and light fastness properties were seen.

The following examples of dyes of Formula (Iaf)

were prepared by the procedure of Example 157 (see Table 8)

TABLE 8
Ex-					λmax
ample	D″	R21	R22	n	(nm)
158		—H	—C2H5	4	491
159		—H	—C2H5	3	486
160		—CH3	—C2H5	4	649
161		—CH3	—C2H5	3	642
162		—CH3	—C2H5	4	561
163		—CH3	—C2H5	3	556
164		—CH3	—C3H7	3	558
165		—CH3	—C2H5	4	535
166		—CH3	—C2H5	4	548
167		—CH3	—C2H5	3	536
168		—H	—C2H5	4	529

EXAMPLE 169

4-nitrophenylazo)-3-methyl-N-ethyl-N-(2-(1-cyanoethoxy) carbonylethyl)-aniline

2-cyano-4-nitroaniline (2.1 parts) was set stirring at 5° C. with a mixture of acetic acid and propionic acid, 86:14 (40 parts). Nitrosyl sulphuric acid 40% (4.9 parts) was added below 5° C. and the mixture was stirred for 30 minutes.

The diazo solution was added gradually to a stirred coupling mixture of N-ethyl, N-(2-(1-cyanoethoxy)carbonylethyl)-m-toluidine (3.7 parts), acetone (50 parts), water (300 parts) and sulphamic acid (1 part). After two hours the product was isolated by filtration, washed with cold water and dried to yield, 4-(2-cyano-4-nitrophenylazo)-3-methyl-N-ethyl-N-(2-(1-cyanoethoxy) carbonylethyl)-aniline (3.5 parts) λmax=534 nm (acetone)

When applied to polyester materials from aqueous dispersion, rubine shades with excellent wet and light fastness properties were seen.

The following examples of dyes of Formula (Ida)

were prepared by the procedure of Example 169 (see Table 9)

TABLE 9
					λmax
Example	D′′′	R23	R24	R25	(nm)
170		—CH3	—C2H5		533
171		—CH3	—C2H5		544
172		—CH3	—C2H5		507
173		—CH3	—C2H5		446
174		—CH3	—C2H5		580
175		—H	—C2H5		523
176		—H	—C2H5		494
177		—H	—C2H5	—CH3	522
178		—H	—C2H5	—CH3	473
179		—H	—C4H9	—CH3	480
180		—H	—C2H5	—CH3	494
181		—H	—C2H5	—CH3	439
182		—H	—C4H9	—CH3	441
183		—H	—C2H5	—CH3	521
184		—H	—C2H5	—CH3	533
185		—H	—C2H5	—CH3	590
186		—CH3	—C2H5	—CH3	449
187		—CH3	—C2H5	—CH3	544
188		—CH3	—C2H5	—CH3	581
189		—CH3	—C2H5	—CH3	544
190		—CH3	—C2H5	—CH3	533
191		—CH3	—C2H5	—CH3	601
192		—CH3	—C2H5	—CH3	506
193		—H	—C2H5	—CH3	640

EXAMPLE 194

4-(2-chloro-4-nitrophenylazo)-N-ethyl-N-(2-cyanomethoxy carbonylpropyl)-aniline

2-chloro-4-nitroaniline (parts) was set stirring at 5° C. with a mixture of acetic acid and propionic acid, 86:14 (40 parts). Nitrosyl sulphuric acid 40% (4.9 parts) was added below 5° C. and the mixture The diazo solution was stirred for 30 minutes.

The diazo solution was added gradually to a stirred coupling mixture of N-ethyl, N-2-(cyanomethoxycarbonylpropyl)-aniline (parts), acetone (50 parts), water (300 parts) and sulphamic acid (1 part). After two hours the product was isolated by filtration, washed with cold water and dried to yield, 4-(2-chloro-4-nitrophenylazo)-N-ethyl-N-(2-cyanomethoxycarbonylpropyl)-aniline (3.5 parts) λmax=534 nm (acetone)

When applied to polyester materials from aqueous dispersion, red shades with excellent wet and light fastness properties were seen.

The following examples of dyes of Formula (Ica)

were prepared by the procedure of Example 194 (see Table 10)

TABLE 10
					λmax
Example	D′′′′	R26	R27	R28	(nm)
195		—H	—H	—CH3	521
196		—H	—H	—CH3	473
197		—H	—H	—CH3	440
198		—H	—H	—CH3	521
199		—H	—H	—CH3	569
200		—CH3	—H	—CH3	505
201		—CH3	—H	—CH3	448
202		—CH3	—H	—CH3	532
203		—CH3	—H	—CH3	541
204		—CH3	—H	—CH3	579
205		—CH3	—H	—CH3	525
206		—CH3	—H	—CH3	541
207		—CH3	—H	—CH3	599
208		—H	—H	—CH3	588
209		—CH3	—CH3	—H	535
210		—CH3	—CH3	—H	544
211		—CH3	—CH3	—H	594
212		—CH3	—CH3	—H	549

EXAMPLE 213

4-(4-nitrophenylazo)-N-ethyl-N-(2-(1-cyanoethoxy) carbonylpropyl)-aniline

4-nitroaniline (2.0 parts) was set stirring at 5° C. with a mixture of acetic acid and propionic acid, 86:14 (50 parts). Nitrosyl sulphuric acid 40% (5.7 parts) was added below 5° C. and the mixture was stirred for 30 minutes.

The diazo solution was added gradually to a stirred coupling mixture of N-ethyl, N-(2-(1-cyanoethoxy)carbonylpropyl)-aniline (4.7 parts), acetone (50 parts), water (200 parts) and sulphamic acid (1 part). After two hours the product was isolated by filtration, washed with cold water and dried to yield, 4-(4-nitrophenylazo)-N-ethyl-N-(2-(1-cyanoethoxy)carbonylpropyl)-aniline

(2.9 parts) λmax=473 nm (acetone)

When applied to polyester materials from aqueous dispersion, scarlet shades with excellent wet and light fastness properties were seen.

The following examples of dyes of Formula (Ih):

were prepared by the procedure of Example 213 (see Table 11)

TABLE 11
Ex-					λmax
ample	D′′′′′	R29	R30	R31	(nm)
214		—H	—CH3	—CH3	519
215		—CH3	—CH3	—CH3	504
216		—CH3	—CH3	—CH3	531
217		—CH3	—CH3	—CH3	537
218		—CH3	—CH3	—CH3	597
219		—H	—CH3	—CH3	517
220		—H	—CH3	—CH3	428
221		—H	—CH3	—CH3	428
222		—CH3	—CH3	—CH3	449
223		—CH3	—CH3	—CH3	539
224		—CH3	—CH3	—CH3	524

EXAMPLE 225

4-(2-cyano-4-nitrophenylazo)-N-ethyl-N-(1-cyanomethoxy carbonylethyl)-m-toluidine

2-cyano-4-nitroaniline (3.1 parts) was set stirring at 5° C. with a mixture of acetic acid and propionic acid, 86:14 (40 parts). Nitrosyl sulphuric acid 40% (6.6 parts) was added below 5° C. and the mixture was stirred for 30 minutes.

The diazo solution was added gradually to a stirred coupling mixture of N-ethyl, N-(1-cyanomethoxycarbonylethyl)-m-toluidine (4.1 parts), methanol (40 parts), water (200 parts) and sulphamic acid (1 part). After two hours the product was isolated by filtration, washed with cold water and dried to yield, 4-(2-cyano-4-nitrophenylazo)-N-ethyl-N-(1-cyanomethoxycarbonylethyl)-m-toluidine (3.9 parts) λmax=510 nm (acetone)

When applied to polyester materials from aqueous dispersion, red shades with excellent wet and light fastness properties were seen.

Claims

1. Dyestuff of the formula I

2. Dyestuff according to claim 1 of the formula (Ia)

3. Dyestuff according to claim 1 of the formula (Ib)

4. Dyestuff according to claim 1 of the formula (Ic)

5. Dyestuff according to claim 1 of the formula (Id)

6. Dyestuff according to claim 1 of the formula (Ie)

7. Dyestuff according to claim 1 of the formula (If)

8. Dyestuff according to claim 1 of the formula (Ig)

9. Process for the preparation of a dyestuff as claimed in claim 1, which comprises diazotizing an amine of the formula III

10. (canceled)

11. A process for dyeing and printing of synthetic textile material and fibre blends thereof which comprises contacting the dyestuff as claimed in claim 1 with the material.