Monoazo dyes

Abstract: A monoazo dye of the following formula (I): wherein R is phenyl, phenoxy or benzyl, and D is a group of the formula (D1), (D2), (D3) or (D4): wherein each of X 1 , X 2 and X 3 , which are independent of one another, is hydrogen or chlorine, X 4 is hydrogen, chlorine, methyl or -NHCOR 1 , wherein R 1 is C 1-4 alkyl or phenyl; wherein X 4 is as defined above, Y 1 is hydrogen, chlorine or C 1-4 alkoxy; wherein X 5 is hydrogen, halogen, methyl or -NHZ, wherein Z is C 1-4 alkylsurfonyl, C 1-4 alkylcarbonyl, phenylsulfonyl, phenylcarbonyl, C 1-2 alkoxy C 1-2 alkylcarbonyl or aminocarbonyl, Y 2 is hydrogen, methyl or C 1-2 alkoxy, and Q 1 is cyano or C 1-4 alkylcarbonyl; wherein P is formyl, nitro or cyano, Q 2 is cyano or nitro, T is halogen, methyl, phenyl or methylsulfonyl, X 5 is as defined above, and Y 3 is hydrogen or C 1-2 alkoxy.

Description: The present invention relates to water-insoluble monoazo dyes, particularly monoazo dyes suitable for dyeing polyester fibers. More particularly, it relates to red, blue or reddish purple monoazo dyes suitable for dyeing fine denier polyester fibers. Recently polyester fibers have remarkably advanced toward finer fibers to provide textiles of high added values having comfortable touch or high quality, and various fine denier fibers of less than 0.3 d, so-called ultramicro fibers, have been developed and extensively used. However, when ultramicro fibers having small diameters are dyed with conventional dyes, there is a problem that the wet color fastness such as color fastness to washing substantially decreases. Chemical Abstracts 100: 8493s describes dyestuffs for dyeing polyester fibers in blue to greenish blue shades, which, however, are of no industrial value, because their color fastness to light and their pH dependency are only poor. Derwent abstract access number: 85-003939 (1) describes dyestuffs which dye, according to the author, hydrophobic textiles into clear blue to green colour with high dyeability and fastness. However, their pH dependency is remarkably poor. GB-A- 1 465 941 deals with dyestuffs which bear a carboxylic group and which have therefore only very poor dyeing properties to polyester fibers. The object of the present invention is to provide a red, blue or reddish purple disperse dye capable of giving dyed products having not only good color fastness to washing but also excellent color fastnesses to perspiration (alkali). The present invention provides a monoazo dye of the following formula (I): wherein R is phenyl, phenoxy or benzyl, and D is a group of the formula (D1), (D2), (D3) or (D4): wherein each of X 1 , X 2 and X 3 , which are independent of one another, is hydrogen or chlorine, X 4 is hydrogen, chlorine, methyl or -NHCOR 1 , wherein R 1 is C 1-4 alkyl or phenyl; wherein X 4 is as defined above, Y 1 is hydrogen, chlorine or C 1-4 alkoxy; wherein X 5 is hydrogen, halogen, methyl or -NHZ, wherein Z is C 1-4 alkylsulfonyl, C 1-4 alkylcarbonyl, phenylsulfonyl, phenylcarbonyl, C 1-2 alkoxy C 1-2 alkylcarbonyl or aminocarbonyl, Y 2 is hydrogen, methyl or C 1-2 alkoxy, and Q 1 is cyano or C 1-4 alkylcarbonyl; wherein P is formyl, nitro or cyano, Q 2 is cyano or nitro, T is halogen, methyl, phenyl or methylsulfonyl, X 5 is as defined above, and Y 3 is hydrogen or C 1-2 alkoxy. Now, the present invention will be described in detail. The monoazo dye of the above formula (I) covers the following four types of monoazo dyes represented by the formulae (I-1), (I-2), (I-3) and (I-4): wherein X 1 , X 2 , X 3 , X 4 and R are as defined above; wherein X 4 , Y 1 and R are as defined above; wherein X 5 , Y 2 , Q 1 and R are as defined above; wherein P, Q 2 , T, X 5 , Y 3 and R are as defined above. In the formulae (I-1) and (I-2), when X 4 is -NHCOR 1 , C 1-4 alkyl for R 1 is linear or branched C 1-4 alkyl such as methyl, ethyl, n-propyl, i-propyl or n-butyl. In the formulae (I-3) and (I-4), halogen for T or X 5 is chlorine or bromine, preferably chlorine. When X 5 is -NHZ, C 1-4 alkylsulfonyl for Z is linear or branched alkylsulfonyl such as methylsulfonyl, ethylsulfonyl, n-propylsulfonyl, i-propylsulfonyl, n-butylsulfonyl or sec-butylsulfonyl. As C 1-4 alkylcarbonyl, C 1-4 linear or branched alkylcarbonyl such as methylcarbonyl, ethylcarbonyl, n-propylcarbonyl, i-propylcarbonyl, n-butylcarbonyl or i-butylcarbonyl may be mentioned. Among them, C 1-2 alkylsulfonyl and C 1-2 alkylcarbonyl are particularly preferred. As C 1-2 alkoxy C 1-2 alkylcarbonyl for Z, methoxymethylcarbonyl, ethoxymethylcarbonyl, methoxyethylcarbonyl or ethoxyethylcarbonyl may be mentioned. Particularly preferred is methoxymethylcarbonyl. As C 1-2 alkoxy for Y 2 or Y 3 , methoxy or ethoxy may be mentioned. In the formula (I-3), as C 1-4 alkylcarbonyl for Q 1 , methylcarbonyl, ethylcarbonyl, n-propylcarbonyl or n-butylcarbonyl may be mentioned. Particularly preferred is C 1-2 alkylcarbonyl. Among the dyes of the present invention represented by the formula (I), the following dyes (1) to (5) are preferred: (1) a dye of the formula (I-1), wherein X 1 is hydrogen, at least one of X 2 and X 3 is chlorine, -NHCOR 1 is acetylamino or benzoylamino, and R is phenyl, which is represented by the following formula (I-1-1): wherein one of X 2-1 and X 3-1 is chlorine, the other is hydrogen, and X 4-1 is acetylamino or benzoylamino; (2) a dye of the formula (I-1), wherein X 1 is chlorine, X 2 and X 3 are hydrogen, -NHCOR 1 is acetylamino, and R is phenyl, which is represented by the following formula (I-1-2); (3) a dye of the formula (I-2) wherein X 4 is hydrogen, methyl or C 1-2 alkylcarbonylamino, Y 1 is hydrogen, and R is phenyl, especially a dye of the formula (I-2) wherein X 4 and Y 1 are hydrogen, and R is phenyl, which is represented by the following formula (I-2-1); (4) a dye of the formula (I-3) wherein X 5 is C 1-2 alkylcarbonylamino or methoxymethylcarbonylamino, Y 2 is hydrogen, Q 1 is cyano or methylcarbonyl, and R is phenyl; (5) a dye of the formula (I-4) wherein X 5 is C 1-2 alkylcarbonylamino or methoxymethylcarbonylamino, Y 3 is hydrogen, R is phenyl, P is formyl, Q 2 is cyano, and T is halogen. The monoazo dye of the formula (I-1) is prepared, for example, by diazotizing an amine of the following formula (II): wherein X 1 , X 2 and X 3 are as defined above, by a conventional method, followed by coupling with an aniline of the following formula (III): wherein X 4 and R are as defined above. The monoazo dye of the formula (I-2) is prepared, for example, by diazotizing 2-amino-6-nitrobenzothiazole by a conventional method, followed by coupling with an aniline of the following formula (IV): wherein X 4 , Y 1 and R are as defined above. The monoazo dye of the formula (I-3) is prepared, for example, by diazotizing an amine of the following formula (V): wherein Q 1 is as defined above, by a conventional method, followed by coupling with an aniline of the following formula (VI): wherein X 5 , Y 2 and R are as defined above. The monoazo dye of the formula (I-4) is prepared, for example, by diazotizing an amine of the following formula (VII): wherein P, Q 2 and T are as defined above, by a conventional method, followed by coupling with an aniline of the following formula (VIII): wherein X 5 , Y 3 and R are as defined above. Textile materials to which the monoazo dye of the present invention is applicable, include polyester fibers made of polyethylene terephthalate, polybutylene terephthalate or a polycondensate of terephthalic acid and 1,4-bis-(hydroxymethyl)cyclohexane, polyamide fibers made of nylon and the like, and fiber blend products such as blended yarn fabrics and union cloths comprising natural fibers such as cotton, silk and wool fibers and the above mentioned polyester fibers. Particularly, among polyester fibers, not only ordinary polyester fibers (regular denier fibers) but also microfibers (fine denier fibers, which are less than 1 d) and ultramicro fibers (which are less than 0.3 d) may be mentioned as fibers which can successfully be dyed with the monoazo dye of the present invention. When the monoazo dye of the present invention is used in dyeing, the monoazo dye of the formula (I) is dispersed in an aqueous medium by means of a dispersing agent in the usual way to prepare a dye bath for dyeing or a printing paste for textile printing. For example, in the case of dyeing, polyester fibers and fiber mixture products such as blended yarn fabrics of union cloth product comprising polyester fibers can be dyed with good color fastness by common dyeing methods, such as a high temperature dyeing method, a carrier dyeing method and a thermosol dyeing method. In some cases, the addition of an acidic substance to the dyeing bath may result in more successful dyeing. Dyed products obtained by dyeing or textile printing with the monoazo dye of the present invention are excellent in not only color fastness to washing but also various color fastnesses such as color fastnesses to perspiration (alkali), to sublimation and to water. Further, even if the dyed products are further processed, no substantial decrease in the wet color fastness occurs. The monoazo dye of the present invention may be used in combination with similar or other types of dyes. Now, the present invention will be described in further detail with reference to Examples. However, it should be understood that the present invention is by no means restricted by such specific Examples. EXAMPLE 1 0.025 g of a 1:1 monoazo dye mixture of the monoazo dyes of the following formulae (I-1-3) and (I-1-4): which are covered by the formula (I-1) wherein X 4 is -NHCOCH 3 and R is phenoxy, was dispersed in 200 ml of water containing 0.025 g of a naphthalenesulfonic acid-formaldehyde condensate and 0.025 g of a sulfuric acid ester of a higher alcohol to prepare a dye bath. In the dye bath, 10 g of a union cloth comprising polyester fibers of 2d and 0.01 d was immersed for dyeing at 135°C for 30 minutes. After the dyeing, the cloth was subjected to soaping, washed with water and dried, whereby a brilliant red well-dyed cloth was obtained with the different denier polyester fibers dyed with the same color and the same color strength. The color fastness to washing of the union cloth dyed with the dye mixture was as excellent as 4-5 grade. The color fastness to washing was measured in accordance with the AATCC 2A method and evaluated by the degree of staining on a nylon cloth. The dye mixture used in this Example was prepared as follows. 4.4 g of a 1:1 mixture of 5,6-dichloroaminobenzothiazole 6,7-dichloroaminobenzothiazole and was dissolved in 80 g of a 50% sulfuric acid aqueous solution at 80°C and then cooled to 0°C. Then, 6.5 g of a 43% nitrosylsulfuric acid was added to the solution at 0°C, and the solution was stirred for 2 hours to obtain a diazo liquid. After 9.0 g of N,N-diphenoxycarbonyloxyethyl-m-acetylaminoaniline was dissolved in 200 ml of methanol, the diazo liquid was dropwise added thereto at 0 to 5°C followed by stirring for 2 hours. The product was collected by filtration, washed with water and dried to obtain the desired dye mixture. The wavelength at the maximum absorption of the dye mixture (λ max : in acetone) was 530 nm. COMPARATIVE EXAMPLE 1 The compound having the same basic chemical structure as represented by the formula (I-1) wherein X 4 is - NHCOCH 3 and R is ethoxy (dye used in Example 1 in Japanese Unexamined Patent Publication No.255601/1993), was synthesized in accordance with the method in Example 1, and an ultramicro fiber union cloth was dyed therewith. The dyed cloth was evaluated in the same manner as in Example 1. The color fastness to washing of the dyed cloth was as poor as 3 grade. EXAMPLES 2 TO 25 The dyes shown in Tables 1 and 2 were synthesized, and ultramicro fiber union cloths were dyed therewith. The color fastnesses to washing of the dyed cloths were measured in the same manner as in Example 1. The results are shown in Tables 1 and 2. EXAMPLE 26 0.025 g of the monoazo dye of the following formula (I-2-1) which corresponds to the formula (I-2) wherein X 4 and Y 1 are hydrogen, and R is phenyl: was dispersed in 200 ml of water containing 0.025 g of a naphthalenesulfonic acid-formaldehyde condensate and 0.025 g of a sulfuric acid ester of a higher alcohol to prepare a dye bath. 10 g of a union cloth comprising polyester fibers of 2 d and 0.01 d was immersed in the dye bath at 135°C for 30 minutes for dyeing, and then the cloth was subjected to soaping, washed with water and dried, whereby a brilliant red well-dyed cloth was obtained with the different denier fibers dyed with the same color and the same color strength. The color fastness to washing of the union cloth dyed with the dye was as a excellent as 4 to 5 grade. The color fastness to washing was measured in accordance with the AATCC 2A method and evaluated by the degree of staining on a nylon cloth. The dye used in this Example was prepared as follows. 10.0 g of 2-amino-6-nitrobenzothiazole was added to a liquid mixture of 45 g of 75% phosphoric acid, 16 g of acetic acid and 8.5 g of sulfuric acid, and 16 g of 43% nitrosylsulfuric acid was dropwise added thereto at -2°C followed by stirring for 2 hours to obtain a diazo liquid. After 19.0 g of N,N-dlphenylcarbonyloxyethylaniline was dissolved in 800 ml of methanol, the diazo liquid was dropwise added thereto at 0 to 5°C. The mixture was stirred for 2 hours. The product was collected by filtration, washed with water and dried to obtain the desired dye. The wavelength at the maximum absorption of the dye (λ max : in acetone) was 530 nm. COMPARATIVE EXAMPLE 2 The compound of the formula (I-2) wherein each of X 4 and Y 1 is hydrogen and R is methyl (as disclosed in Japanese Examined Patent Publication No. 16039/1961) was synthesized in accordance with the method in Example 26, and an ultramicro fiber union cloth was dyed therewith and the dyed cloth was evaluated in the same manner as in Example 26. The color fastness to washing of the dyed cloth was as poor as 3 grade. EXAMPLES 27 TO 41 The dyes shown in Table 3 were synthesized in the same manner as in Example 26. Ultramicro fiber union cloths were dyed therewith, and the color fastness to washing was measured in the same manner as in Example 26. The results are shown in Table 3. EXAMPLE 42 0.025 g of the monoazo dye of the above formula was dispersed in 200 ml of water containing 0.025 g of a naphthalenesulfonic acid-formaldehyde condensate and 0.025 g of a sulfuric acid ester of a higher alcohol to prepare a dye bath. 10 g of a union cloth comprising polyester fibers of 2 d and 0.01 d was immersed for dyeing at 135°C for 30 minutes, and then the cloth was subjected to soaping, washed with water and dried, whereby a brilliant blue well-dyed cloth with the different denier fibers dyed in the same color and with the same color strength was obtained. The color fastness to washing of the union cloth dyed with the dye was as excellent as 4 + grade. The color fastness to washing was measured by the AATCC 2A method and evaluated by the degree of staining on a nylon cloth. The monoazo dye used in this Example was prepared as follows. 0.76 g of sodium nitrite was added to 5 g of sulfuric acid, and the resulting mixture was heated to 70°C and then cooled to 5°C. A mixture of 1.4 g of propionic acid and 8.6 g of acetic acid was gradually added thereto, and the temperature was elevated to 15°C and maintained at this level. After the solution was cooled to 0°C, 1.7 g of 2-amino-3-cyano-5-nitrothiophene and then 1.4 g of propionic acid and 8.6 g of acetic acid were added to the solution, and the resulting mixture was stirred at 5°C for 75 minutes. To the mixture, the same amounts of propionic and acetic acid were added, and the mixture was further stirred at 5°C for one hour. Urea was added to the mixture to decompose the remaining nitrous acid, and the resulting diazonium salt solution was dropwise added to a solution of 4.5 g of N,N-dibenzoyloxyethylamino-m-acetoanilide in 200 ml of methanol at 0 to 5°C, and the solution was stirred for 2 hours. The desired dye was separated from the solution by filtration, washed with water and dried. The wavelength at the maximum absorption of the dye (λ max : in acetone) was 606 nm. COMPARATIVE EXAMPLE 3 The dye of the following formula: as disclosed in Example 80 in Japanese Examined Patent Publication No. 47214/1982, was evaluated in the same manner as in Example 42, and the color fastness to washing was as poor as 2 to 3 grade. EXAMPLES 43 TO 74 The dyes shown in Table 4 were synthesized in accordance with the method in Example 42, and ultramicro fiber union cloths were dyed in the same manner as in Example 42. The color fastness to washing of all the dyes were at least 4 + grade. EXAMPLE 75 0.025 g of the monoazo dye of the above formula was dispersed in 200 ml of water containing 0.025 g of a naphthalenesulfonic acid-formaldehyde condensate and 0.025 g of a sulfuric acid ester of a higher alcohol to prepare a dye bath. 10 g of a union cloth comprising polyester fibers of 2 d and 0.01 d was immersed for dyeing at 135°C for 30 minutes, and then the cloth was subjected to soaping, washed with water and dried, whereby a brilliant blue well-dyed cloth with the different denier fibers dyed in the same color and with the same color strength was obtained. The color fastness to washing of the union cloth dyed with the dye was as excellent as 4 + grade. The color fastness to washing was measured by the AATCC 2A method and evaluated by the degree of staining on a nylon cloth. The monoazo dye used in this Example was prepared as follows. To a mixture of 15 g of glacial acetic acid/propionic acid (3:1) and 5.0 g of 85% sulfuric acid, 1.9 g of 2-amino-3-cyano-4-chloro-5-formylthiophene was added and then 3.2 g of nitrosylsulfuric acid (43%) was dropwise added at 0 to 5°C. The resulting solution was stirred at 0 to 5°C for 4 hours. Urea was added to the solution to decompose the residual nitrous acid, and the resulting solution was dropwise added to a solution of 4.5 g of N,N-dibenzoyloxyethylamino-m-acetoanilide in 200 ml of methanol at 0 to 5°C. The solution was stirred for 2 hours and filtered to collect the desired dye, and it was washed with water and dried. The wavelength at the maximum absorption of the dye (λ max : in acetone) was 590 nm. COMPARATIVE EXAMPLE 4 The dye disclosed in Example 6 in Japanese Unexamined Patent Publication No. 266466/1986 of the following formula: was evaluated in accordance with Example 75. As a result, the color fastness to washing was as poor as 2 to 3 grade. EXAMPLES 76 TO 95 The dyes shown in Table 5 were synthesized in accordance with the method in Example 75, and ultramicro fiber union cloths were dyed in the same manner as in Example 75. The color fastnesses to washing were at least 4 + . The present invention provides dyes capable of dyeing polyester fibers with excellent color fastnesses to perspiration (alkali), to sublimation and to water. The present invention provides- disperse dyes capable of dyeing polyester ultramicro fibers which are difficult to dye, with red, blue or reddish violet with excellent color fastness.

Claims: A monoazo dye of the following formula (I): wherein R is phenyl, phenoxy or benzyl, and D is a group of the formula (D1), (D2), (D3) or (D4): wherein each of X 1 , X 2 and X 3 , which are independent of one another, is hydrogen or chlorine, X 4 is hydrogen, chlorine, methyl or -NHCOR 1 , wherein R 1 is C 1-4 alkyl or phenyl; wherein X 4 is as defined above, Y 1 is hydrogen, chlorine or C 1-4 alkoxy; wherein X 5 is hydrogen, halogen, methyl or -NHZ, wherein Z is C 1-4 alkylsulfonyl, C 1-4 alkylcarbonyl, phenylsulfonyl, phenylcarbonyl, C 1-2 alkoxy C 1-2 alkylcarbonyl or aminocarbonyl, Y 2 is hydrogen, methyl or C 1-2 alkoxy, and Q 1 is cyano or C 1-4 alkylcarbonyl; wherein P is formyl, nitro or cyano, Q 2 is cyano or nitro, T is halogen, methyl, phenyl or methylsulfonyl, X 5 is as defined above, and Y 3 is hydrogen or C 1-2 alkoxy. The monoazo dye according to Claim 1, which is represented by the following formula (I-1): wherein X 1 , X 2 , X 3 , X 4 and R are as defined above. The monoazo dye according to Claim 2, which is represented by the following formula (I-1-1): wherein one of X 2-1 and X 3-1 is chlorine, the other is hydrogen, and X 4-1 is acetylamino or benzoylamino. The monoazo dye according to Claim 2, which is represented by the following formula (I-1-2). The monoazo dye according to Claim 1, which is represented by the following formula (I-2): wherein X 4 , Y 1 and R are as defined above. The monoazo dye according to Claim 5, wherein X 4 is hydrogen, methyl or C 1-2 alkylcarbonylamino, Y 1 is hydrogen, and R is phenyl. The monoazo dye according to Claim 5, which is represented by the formula (I-2-1): The monoazo dye according to Claim 1, which is represented by the following formula (I-3): wherein X 5 , Y 2 , Q 1 and R are as defined above. The monoazo dye according to Claim 8, wherein X 5 is C 1-2 alkylcarbonylamino or methoxymethylcarbonylamino, Y 2 is hydrogen, Q 1 is cyano or methylcarbonyl, and R is phenyl. The monoazo dye according to Claim 1, which is represented by the following formula (I-4): wherein P, Q 2 , T, X 5 , Y 3 and R are as defined above. The monoazo dye according to Claim 10, wherein X 5 is C 1-2 alkylcarbonylamino or methoxymethylcarbonylamino, Y 3 is hydrogen, R is phenyl, P is formyl, Q 2 is cyano, and T is halogen. A method for dyeing polyester ultramicro fibers with a dye, wherein the dye is the monoazo dye as defined in Claim 1. Polyester ultramicro fibers dyed with the monoazo dye as defined in Claim 1.

Inventors: HIHARA TOSHIO, HIMENO KIYOSHI, SEKIOKA RYOUICHI, HIHARA, TOSHIO, HIMENO, KIYOSHI, SEKIOKA, RYOUICHI, HIHARA, TOSHIO, HOECHST MITSUBISHI KASEI CO. LTD, HIMENO, KIYOSHI, HOECHST MITSUBISHI KASEI CO. LTD, SEKIOKA, RYOUICHI, HOECHST MITSUBISHI KASEI CO LTD
Applicants: DYSTAR TEXTILFARBEN GMBH & CO, DYSTAR TEXTILFARBEN GMBH & CO. DEUTSCHLAND KG
Application year: 1995
Main classification: C09B29
IPC codes: C09B29, D06P3