Reactive dyes containing a 2,6-difluoro-3,5-dichloropyridine-4-ylamino group

Abstract: A water-soluble dye which contains a group of Formula (1):

Description: This invention relates to dyes which contain a 2,6-difluoro-3,5-dichloropyridin-4-ylamino reactive group of Formula (1) (hereinafter a DFDC group), to a process for their manufacture, to a process for the coloration of materials using the dyes and to materials when coloured by the dyes. The fiber reactive 2,6-difluoro-3,5-dichloropyridin group is mentioned inter alia in the reference FR-A-2392088 which refers to reactive dyes of the halopyridine type. According to the present invention there is provided a water-soluble dye which contains a group of the Formula (1): which group of the formula (1) is attached to a monohalotriazinylamino substituent on the dye via the group -N(R 2 )-B- wherein B is an optionally substituted alkylene, phenylene or naphthylene group; and R 2 is H or C 1-4 alkyl. The triazinylamino reactive group is preferably a 2,4,6- s -triazinylamino group carrying a labile atom or group at the 3-position and, at the 5-position, a labile atom or group, an alkoxy group, especially C 1-4 alkoxy or an optionally substituted alkyl group, especially optionally substituted phenylamino or optionally substituted alkylamino. Preferred optional substituents are selected from sulpho and DFDC. The preferred optionally substituted alkylamino group is an optionally substituted C 1-4 alkylamino group, for example CH 3 -NH-and CH 3 CH 2 -NH-. As later mentioned, a compound of Formula (11), later defined, may be condensed with a dye having a dihalotriazinyl substituent, so as to provide a dye according to the invention. A further preferred dye according to the invention contains a group of the Formula (2): wherein: each of R 1 and R 2 independently is H or C 1-4 -alkyl; T is a labile atom or group; and B is an optionally substituted alkylene, phenylene or naphthylene group. The optional substituent which may be present on B is preferably hydroxy, amino or especially sulpho. A preferred optionally substituted alkylene group represented by B is a C 2-4 -alkylene group, especially -CH 2 CH 2 -. When B is optionally substituted phenylene or naphthylene it preferably carries a sulpho group. A preferred phenylene group is a phen-1,3-ylene group, especially sulphophen-1,3-ylene. By a labile atom or group, it is meant an atom or group which is bound by a chemical bond to the triazine nucleus, which atom or group is displaceable by a hydroxyl group of cellulose under mildly alkaline aqueous conditions to form a covalent bond between the triazine nucleus and cellulose. As examples of such atoms or groups, there may be mentioned halogen atoms such as F and Cl; sulphonic acid groups; thiocyano groups; quaternary ammonium groups such as trialkylammonium groups; and optionally substituted pyridinium groups such as nicotinyl and iso-nicotinyl groups. It is preferred that T is halo, especially fluoro or chloro; or 3- or 4-carboxypyridinium. The water-soluble dye according to the invention is preferably a water-soluble azo, anthraquinone, phthalocyanine, triphenodioxazine or formazan dye. Thus preferred dyes of the present invention are of the formula D-(Z) n wherein Z is of Formula (1) or (2) as hereinbefore defined, n is 1, 2 or 3 and D is the residue of an azo, anthraquinone, phthalocyanine, triphenodioxazine or formazan chromophore. Examples of groups represented by D are given in the following pages in Formulae (3) to (10) wherein D is the portion of the illustrated molecules other than group Z. Preferred water-soluble azo dyes are monoazo and disazo dyes. Preferred monoazo dyes are formula L-N=N-L 1 -Z wherein L is an aryl or heteroaryl radical, L 1 is an arylene radical and Z is of Formula (1) or (2) as hereinbefore defined. It is preferred that each aryl or arylene radical independently is a mono- or di-cyclic aryl or arylene radical. Preferred aryl radicals are optionally substituted phenyl and naphthyl, and preferred arylene radicals are phenylene and naphthylene. Preferred heteroaryl radicals are pyridonyl and pyrazolonyl. A first preferred monoazo dye is of the Formula (3) or salt thereof: wherein: L, X and Z are as hereinbefore defined. L is preferably optionally substituted phenyl or naphthyl, especially a phenyl or naphthyl group having at least one sulpho substituent. Further optional substituents which may be present on L include a halogen atom, especially chlorine; an alkyl radical, especially C 1-4 -alkyl, more especially methyl; an acylamino radical, especially acetylamino, benzamido or sulphonated benzamido; amino; hydroxy; and an alkoxy radical, especially C 1-4 -alkoxy, more especially methoxy. As examples of phenyl groups having at least one sulpho substituent there may be mentioned 2-, 3- or 4-sulphophenyl; 2-sulpho-4-nitrophenyl; 2-sulpho-5-nitrophenyl; 4-sulpho-2-methylphenyl; 5-sulpho-2-methylphenyl; 2-sulpho-4-methylphenyl; 5-sulpho-2-methoxy phenyl; 2-sulpho-4-methoxyphenyl; 4-sulpho-2-chlorophenyl; 5-sulpho-2-carboxyphenyl; 2,4-disulphophenyl; 2,5-disulphophenyl; and 3,5-disulphophenyl. As examples of naphthyl groups having at least one sulpho substituent there may be mentioned 1-sulphonaphth-2-yl; 1,5,7-trisulphonaphth- 2-yl; 3,6,8-trisulphonaphth-2-yl; 5,7-disulphonaphth-2-yl; 6-sulphonaphth-2-yl; 4-, 5-, 6- or 7-sulphonaphth-1-yl; 4,8-disulphonaphth-1-yl; 3,8-disulphonaphth-1-yl; 2,5,7-trisulphonaphth-1-yl; and 3,5,7-trisulphonaphth-1-yl. Preferred optional substituents which may be present on L 1 are those mentioned above for L. In dyes of Formula (3) Z is preferably at the 6-, 7- or 8-position, especially the 6- or 8- position. When Z is at the 8-position it is preferred that X is a sulpho group and is at the 5- or 6-position. A second preferred monoazo dye is of the Formula (4) or a salt thereof: wherein: R 3 is H or C 1-4 -alkyl; R 4 is H, C 1-4 -alkyl; C 1-4 -alkanoyl; optionally substituted benzoyl, especially benzoyl or sulphobenzoyl, acetyl, propanoyl, n -butanoyl or iso-butanoyl; and Z and each X is as hereinbefore defined. A third preferred monoazo dye is of the Formula (5) or salt thereof: wherein: Ph is an optionally substituted phenyl group, especially sulphophenyl; R 5 is CN, CH 3 or carboxy; and X and Z are as hereinbefore defined. A preferred disazo dye is of Formula (6) or salt thereof: L-N=N-A-N=N-B-Z wherein: A and B are each independently optionally substituted phenylene or naphthylene; and L and Z are as hereinbefore defined. It is preferred that B is optionally substituted phenylene and A is optionally substituted naphthylene. The optional substituents which may be present on A or B are preferably independently selected from halo, especially chloro; alkoxy, especially C 1-4 -alkoxy; alkyl, especially methyl; sulpho; carboxy; hydroxy; amino; acylamino such as acetamido, benzamido and sulphonated benzamido; hydroxy; and a pyrimidinylamino or triazinylamino cellulose-reactive group or a group of Formula (1) or (2) as hereinbefore defined. As Examples of groups represented by A and B there may be mentioned phenylene, sulphophenylene, ureidophenylene, 5-sulpho-1,4-naphthylene, 6-sulpho-1,4-naphthylene and 8-sulpho-1,4-naphthylene. A preferred anthraquinone dye is of the Formula (7) or a salt thereof: wherein the anthraquinone nucleus optionally contains a sulphonic acid group in the 5-, 6-, 7- or 8-position and V is a divalent organic linking group, preferably of the benzene series. V is preferably phenylene, diphenylene, or 4,4'-divalent stilbene or azobenzene radicals which are optionally sulphonated. It is preferred that V contains one sulphonic acid group for each benzene ring present. A preferred phthalocyanine dye is of the Formula (8) or a salt thereof: wherein Pc is a metallo-phthalocyanine nucleus, preferably copper or nickel phthalocyanine; R 1 is as hereinbefore defined; each W independently is a hydroxy or a substituted or unsubstituted amino group, V 1 is a divalent organic linking group, preferably a C 1-4 -alkylene or phenylene linking group; and a and b are each independently 1, 2 or 3 provided that a + b is not greater than 4. A preferred triphenodioxazine dye is of the Formula (9) or a salt thereof: wherein: each Y independently is a covalent bond, C 2-4 -alkylene, phenylene or sulphophenylene; U is H or SO 3 H; T 1 and T 2 are halo, especially chloro, C 1-4 -alkyl, or C 1-4 -alkoxy; and each Z independently is as hereinbefore defined. Each Y is preferably -C 2 H 4 - or -C 3 H 6 -, U is preferably SO 3 H, and T 1 and T 2 are preferably Cl or methyl. It is preferred that both groups represented by Z in Formula (9) are identical to each other. A preferred formazan dye is of the Formula (10) or a salt thereof: wherein: X 1 is H, SO 3 H or Cl; m and p each independently have a value of 0, 1 or 2; and Z is as hereinbefore defined; provided that the formazan group has at least one, and preferably at least two, sulpho groups. It is preferred that m and p each have a value of 1. In dyes of Formula (3) to (10) it is preferred that Z is of Formula (1) or (2). According to a further aspect of the present invention there is provided a compound of the Formula (11) and use thereof for the preparation of a dye: wherein: R 2 and B are as hereinbefore defined. In a compound of Formula (11) B is preferably C 2-4 -alkylene, optionally substituted phenylene, more preferably optionally substituted phen-1,3-ylene, wherein the optional substituents are as hereinbefore described for B. A compound of Formula (11) wherein R 2 is H or C 1-4 alkyl may be used to prepare a dye containing a group of Formula (2) by condensation with a dye of the invention having a dihalotriazinylamino substituent. Condensation is preferably performed in an aqueous solvent, more preferably at 20-90°C. It is preferred that the condensation is performed in the presence of an acid binding agent. A compound of Formula (11) wherein R 2 is H and B is an optionally substituted phenylene or naphthylene group is also useful as a diazotisable amine which may be coupled with a coupling component to give an azo dye. Diazotisation may be achieved by treating a solution of the compound of Formula (11) with sodium nitrite and hydrochloric acid at below 5°C. A compound of Formula (11) may be prepared by condensing 2,4,6-trifluoro-3,5-dichloropyridine with diamine of formula HN(R 2 )-B-NH 2 , preferably in dimethylsulphoxide at 20-90°C, wherein R 2 and B are as hereinbefore defined. Although dye formulae have been shown in the form of their free acid in this specification, the invention also relates to the dyes in the salt form, particularly their salts with alkali metals such as the sodium, lithium or mixed sodium/lithium salt. A further feature of the present invention provides a composition comprising an inert carrier and a water-soluble reactive dye according to the invention, preferably in a weight ratio of 1:99 to 99:1, more preferably 50:1 to 1:50, especially 20:1 to 1:20. The inert carrier preferably comprises inorganic salts and optionally a de-dusting agent. Examples of inorganic salts include alkali and alkali earth metal halides, carbonates, bicarbonates, nitrates and mixtures thereof. Dodecylbenzene may be used as a de-dusting agent. The present invention also provides a process for the coloration of a substrate comprising applying thereto a dye according to the present invention, preferably in aqueous solution. The reactive dyes of the present invention are suitable for colouring natural and artificial textile materials containing amino or hydroxyl groups, for example textile materials such as wool, silk, polyamides and modified polyacrylonitrile fibres, and more especially cotton, viscose rayon and other regenerated cellulosic materials. For this purpose the dyes can be applied to the textile materials by exhaust dyeing, or by padding or by printing using printing pastes containing the conventional thickening agents or oil-in-water emulsions, whereby the textile materials are coloured bright shades and possess good fastness to light and to wet treatments such as washing and also possess good wash off. The new dyes are particularly valuable for colouring cellulosic textile materials. For this purpose the dyes are preferably applied to the cellulosic textile material in conjunction with a treatment with an acid-binding agent, for example, sodium bicarbonate, sodium carbonate, sodium metasilicate, trisodium phosphate or sodium hydroxide, which may be applied to the cellulose textile material before, during or after the application of the dye. The new dyes can be applied to textile materials containing amino groups, such as wool and polyamide textile materials, from a mildly alkaline, neutral or acid dyebath. The dyeing process can be carried out at a constant or substantially constant pH, that is to say the pH of the dyebath remains constant or substantially constant during the dyeing process, or if desired the pH of the dyebath can be altered at any stage of the dyeing process by the addition of acids or acid salts or alkalis or alkaline salts. In a preferred aspect of the present invention the new dyes are applied to a textile material by printing, for example including ink jet printing. The invention is illustrated but not limited by the following Examples in which all parts and percentages are by weight unless stated otherwise. Example 1 Preparation of a dye of Formula (12) wherein D 2 is 1-hydroxy-2-(1-sulpho naphth-2-ylazo)-3,6-disulphonaphth-8-yl 2-Amino-4-(2,6-difluoro-3,5-dichloropyridin-4-yl)aminobenzene sulphonic acid (5.13g, 0.011M) was added at 35°C and pH 6.5 to a solution of 1-hydroxy-2-(1-sulphonaphth-2-ylazo)-8-(4,6-dichloro- s -triazin-2-yl) aminonaphthalene-3,6-disulphonic acid (0.01M). After 3 hours the reaction was essentially complete, as judged by thin layer chromatography, and brine (30g, 15% w/v) was added. The title product precipitated as a solid and was collected and dried. Yield 14.8g, M.I. 1703, 87%, lambda max 547nm. The product was applied to cotton by printing and exhaust dyeing. In both cases excellent fixation was achieved resulting in heavy bluish-red shades with good fastness properties. Example 2 Preparation of a dye of Formula (12) wherein D 2 is 1-hydroxy-2-(2-sulphophenylazo)-3,6-disulphonaphth-8-yl 2-Amino-4-(2,6-difluoro-3,5-dichloropyrid-4-ylamino)benzene sulphonic acid (0.0375M) was added to a solution of 1-hydroxy-2-(2-sulphophenylazo)-8-(4,6-dichloro- s -triazin-2-ylamino)naphthalene-3,6- disulphonic acid (0.034M) in water (400ml). The solution was stirred at pH 6.5 at 20°C for 2 hours, a trace of insoluble material was filtered off and salt (56g, 14% w/v) was added carefully, with stirring, to the filtrate. The resultant precipitated was collected. Yield 35g, M.I. 1420 72%. Mass spectrum. Isotopic cluster (3Cl, 4S) at m/z 982 corresponding to (M-H) - together with sodium salts at m/z 1004 and 1026. Example 3 Preparation of a dye of Formula (12) wherein D 2 is 3-ureido-4-(3,6,8-trisulphonaphth-2-ylazo)phenyl A neutral aqueous solution of the sodium salt of 3-ureido-4-(3,6,8-trisulphonaphth-2-ylazo)aniline (0.02M) was added slowly, at 0°C to 5°C, to a stirred finely divided suspension of cyanuric chloride (9.1g) in acetone, ice and water. After 2 hours a small amount of insoluble material was filtered off and 2-amino-5-(2,6-difluoro-3,5-dichloropyridin-2-ylamino)benzene sulphonic acid was added to the solution. This was heated to 60°C for 4 hours. On cooling salt was added (10% w/v) and the precipitated product collected and dried. Yield 14g, M.I. 1298. Mass spectrum. Isotopic cluster (3Cl, 4S) at 1024, corresponding to (M-H) - together with its Na salts at 1046 and 1068 were detected, consistent with the title structure. Example 4 Preparation of Cyanuric chloride (5g) dissolved in acetone (50ml) was added to a stirred mixture of 2-amino-4-(2,6-difluoro-3,5-dichloropyridin-4-yl) aminobenzene sulphonic acid (0.025M) in water and ice. The mixture was maintained at pH 6.5 by adding 2N sodium carbonate solution until the reaction was complete as judged by thin layer chromatography. After filtering off a small quantity of insoluble material the cold solution was added to a solution of 1-hydroxy-2-(1,5-disulphonaphth-2-ylazo)-6-methylaminonaphthalene-3-sulphonic acid (0.02M) and the resultant mixture heated at 55°C and pH 6.5 for 2 hours. When the reaction was complete the mixture was allowed to cool to room temperature and the product precipitated by the addition of methylated spirits. Yield 18g, M.I. 1255. Mass spectrum. Isotopic cluster (3Cl, 4S) at m/z 1046 (M-H) - together with Na salts at m/z 1068, 1090 and 1112. Example 5 Preparation of Cyanuric chloride (4.1g) in acetone (40ml) was added to a stirred mixture of ice/water (250ml) and Calsolene oil (5 drops). To the resultant finely divided suspension a solution of 1-amino-2-(2,5-disulphophenylazo)-7-(2-sulpho-5-aminophenylazo)-8-hydroxynaphthalene-3,6-disulphonic acid was added slowly keeping the pH between 6 and 7 and the temperature below 5°C. After 30 minutes the mixture was passed through filter paper, the filtrate collected and 2-amino-5-(2,6-difluoro-3,5-dichloropyridin-4-ylamino)benzene sulphonic acid (0.022M) was added. The mixture was heated at 60°C for 4 hours, cooled to 20°C, a small amount of insoluble material was filtered off and the filtrate evaporated to small volume under reduced pressure. Acetone was added to and resultant solid collected, washed and dried. Yield 40g, M.I. 2964. Mass spectrum. Ions at m/z 1261 (M-H) - , 3Cl, 6S together with Na salts at m/z 1283, 1305 and 1327.

Claims: A water-soluble dye which contains a group of Formula (1): which group of the formula (1) is attached to a monohalotriazinylamino substituent on the dye via the group -N(R 2 )-B- wherein B is an optionally substituted alkylene, phenylene or naphthylene group and R 2 is H or C 1-4 alkyl. A water-soluble dye which contains a group of Formula (2): wherein: each of R 1 and R 2 independently is H or C 1-4 -alkyl; T is a labile atom or group; and B is an optionally substituted alkylene, phenylene or naphthylene group. A dye according to Claim 2, wherein T is a halogen atom, a quaternary ammonium group or an optionally substituted pyridinium group. A water-soluble azo, anthraquinone, phthalocyanine, triphenodioxazine or formazan dye which contains a group of Formula (1) or (2), as defined respectively in Claims 1 and 2. A water-soluble dye of the formula D-(Z) n wherein Z is of Formula (1) or (2) as defined respectively in Claims 1 and 2, n is 1, 2 or 3 and D is the residue of an azo, anthraquinone, phthalocyanine, triphenodioxazine or formazan chromophore. A process for the preparation of a dye according to Claim 1 comprising condensation of a compound of the Formula (11): wherein each of R and R 2 is as defined in claim 1, with a dye having a dihalotriazinylamino substituent. A compound of the Formula (11): wherein: R 2 is H or C 1-4 -alkyl; and B is an optionally substituted alkylene, phenylene or naphthylene group. Use of a compound according to Claim 9 for the preparation of a dye. A process for the coloration of a substrate comprising applying thereto a dye according to any one of Claims 1 to 5.

Inventors: TAYLOR JOHN ANTHONY, TAYLOR, JOHN ANTHONY
Applicants: BASF AG, BASF AKTIENGESELLSCHAFT
Application year: 1993
Main classification: C09B62
IPC codes: C09B62, D06P3, C07D401, C07D213, C07D498