WATER-SOLUBLE DISAZO COLORANTS

Abstract: A water-soluble disazo colorants represented, in the form of the free acid, by the formula (I) wherein, X represents a halogen atom; Y represents a chlorine atom or a group represented by -OR¹, -SR¹, -O-R²-OR³ or -S-R²-OR³ (wherein R¹ represents an alkyl group which may be substituted by a hydroxyl group, a cyano group or a halogen atom, or an alkenyl group; R² represents an alkylene group and R³ represents an alkyl group which may be substituted by a hydroxyl group); and Z represents -CH=CH₂, -CH₂CH₂Cl, or -CH₂CH₂OSO₃H.

Description: This invention relates to navy blue-series water-soluble disazo colorants having a novel structure. More particularly, the invention relates to water-soluble disazo colorants which have a vinylsulfone type reactive group and a mono- or di-halogenotriazine type reactive group in the structure and, in particular, in the case of using as dyestuff for cellulose or nitrogen-containing fibers, are excellent in various color fastnesses and level dyeing and also can give densely dyed products. In the case of dyeing cellulose fibers or nitrogen-containing fibers, water-soluble reactive dyestuffs are usually used and the reactive dyestuffs are required to have excellent properties in level dyeing, and capable of providing densely dyed products having good properties in various color fastnesses. The characteristics of such reactive dyestuffs are delicately varied according to the fundamental skeleton, the kinds of substituents, the kinds of reactive groups, and a combination thereof and dyestuffs having various structures have hitherto been proposed. As the results thereof, dyestuffs having a considerably satisfactory level have been practically used at present. JP-A-57/57754 describes reactive disazo dyes represented by the general formula (B) used to dye natural and artificial fibres, especially cellulose fibres in navy blue to black colors. DE-A-31 13 473 comprises reactive disazo compounds of the general formula (C) which are used to dye or to print cellulose fibers. However, in the case of reactive dyestuff having a navy blue tone, dyestuffs having excellent characteristics in various points have never been found. For example, JP-A-118459/86 discloses navy blue series reactive dyestuffs shown by formula (A) but this dyestuff is not always satisfactory in color fastness to chlorine and perspiration under sunlight. That is, conventional dyestuffs of navy blue tone are frequently insufficient in various color fastnesses in the case that they show good level dyeing properties or on the contrary, they are frequently inferior in level dyeing properties in the case that they are excellent in color fastnesses. Also, these reactive dyestuffs are not sufficient in build-up properties. The object of this invention is, therefore, to provide reactive colorants of navy blue series tone excellent in level dyeing properties, densely dyeing properties, build-up properties and various fastnesses to sunlight, chlorine, perspiration under sunlight, etc. That is, according to this invention, there are provided water-soluble disazo colorants, represented in the form of the free acid, by the following formula (I) wherein, X represents a chlorine or fluorine atom; Y represents a chlorine atom or -OR¹ wherein R¹ represents an alkyl group or -CH₂CH=CH₂, and Z represents -CH=CH₂, -CH₂CH₂Cl, or -CH₂CH₂OSO₃H with the proviso that when X is a chlorine atom and the residue is attached to the meta position of the benzene ring with respect to the azo group, Y does not represent a methoxy or ethoxy group. The present invention is explained in detail below. Y represents a chlorine atom or -OR¹ , and examples of the alkyl group shown by R¹ are a straight chain or branched alkyl group having 1 to 8 carbon atoms, such as a methyl group, an ethyl group, a propyl group, a hexyl group, an octyl group or are, preferably a straight chain or branched alkyl group having 1 to 4 carbon atoms, such as an ethyl group or a propyl group. The bonding position of the halogenotriazine group which is a reactive group may be any optional position of the benzene ring except the bonding position of the sulfo group which corresponds to the 2-position with respect to the azo group, but is usually at the 4- or 5-position, and preferably the 5-position with respect to the bonding position of the azo group with the proviso that when X is a chlorine atom and the residue is not attached to the meta position of the benzene ring with respect to the azo group, Y does not represent a methoxy or ethoxy group. Preferred are water-soluble disazo colorants wherein the colorantes are represented, in the form of the free acid, by the formula (I-i) wherein X' is a chlorine or fluorine atom, Y' is a chlorine atom or -OR 1' wherein R 1' is an alkyl group having 1 to 8 carbon atoms, or -CH₂CH=CH₂ ; and Z' is -CH=CH₂, -CH₂CH₂Cl or -CH₂CH₂OSO₃H; with the proviso that when X' is a chlorine atom, Y' does not represent a methoxy or ethoxy group. Furthermore the water-soluble disazo colorants of this invention are preferably represented, in the form of free acid, by the formula (I-ii) wherein X" represents a chlorine atom or a fluorine atom; Y" represents -OR 1" wherein R 1" represents an alkyl group having 1 to 4 carbon atoms and Z" represents -CH=CH₂, -CH₂CH₂ Cl, or -CH₂CH₂OSO₃H; with the proviso that when X" is a chlorine atom, Y" does not represent a methoxy or ethoxy group. Most prefered are water-soluble disazo colorants in the form of the free acid by the formula (I-a) wherein Y¹ represents a chlorine atom, -OCH₃ or -OC₂H₅ group, or formula (I-b) wherein Y² represents a chlorine atom , or -OCH₂CH=CH₂ group. The disazo colorants of this invention are present in the form or the free acid or the form of a salt thereof. As salts are usually alkali metal salts and alkaline earth metal salts and of these salts, lithium salts, sodium salts, and potassium salts are particularly preferred. The disazo colorants of this invention shown by formula (I) described above can be produced by the following methods. For example, by condensing 1 mole of 2,4-diaminobenzenesulfonic acid and 1 mole of a triazine compound represented by formula (II) wherein X and Y have the same significance as defined in formula (I) in an aqueous medium. A compound represented by formula (III) is obtained, wherein X and Y have the same significance as defined in formula (I)). Then, after diazotizing the compound of formula (III) thus obtained, the diazotized compound is coupled with 1 mole of a monoazo compound represented by formula (IV) wherein Z has the same significance a s defined in formula (I)), in an alkaline condition to provide the desired disazo colorant. For obtaining the disazo colorant from a reaction mixture, a salting out method is usually used but the reaction mixture may be spray-dried as it is. The disazo colorants of this invention can be widely utilized as dyestuffs for dyeing fibers or cloths colorants for coloring papers or synthetic resins, and colorants for ink-jet printing ink but are excellent in adaptability as dyestuffs for dyeing fibers or cloths. In the case of using the disazo colorants of this invention for dyeing fibers, examples of fibers being dyed are cellulose series fibers such as cotton, viscose rayon, cupraammonium rayon, hemp, and nitrogen-containing fibers such as polyamide fibers, wool and silk, but cellulose fibers are particularly preferred. Also, these fibers may be used as mixed fibers with polyester, triacetate or polyacrylonitrile fibers. Furthermore, mixed fibers of cellulose fibers and nitrogen-containing fibers can be used in this invention. For dyeing cellulose fibers or nitrogen-containing fibers using the disazo colorants of this invention, the fibers can be dyed according to an ordinary method in the presence of an acid composed of an inorganic alkali such as sodium hydrogencarbonate or sodium carbonate, or an organic base such as triethylamine. As a dyeing method in this invention, a dip dyeing is particularly suitable and in this case, the dyeing temperature is suitable from about 40°C to 80°C. Furthermore, the disazo colorants of this invention can be used for other dyeing methods which can be applied in the case of using vinylsulfone type reactive dyes, such as a cold pad batch method, pad steam method and discharge printing method. The disazo colorants of this invention are water-soluble navy blue series colorants having both a vinylsulfone type reactive group and a mono- or di-halogenotriazine type reactive group in the structure. The disazo colorants of this invention can dye cellulose fiber or nitrogen-containing fibers densely and with good level dyeing properties, are excellent in build-up properties, and further excellent in color fastnesses to light, chlorine and perspiration under sunlight. The present invention is hereinafter described in greater detail with reference to examples, which are not to be construed as limiting the scope thereof. COMPARATIVE EXAMPLE 1 Preparation of a colorant After diazotizing 1 mole of an amino compound shown by the following structure in an ordinary manner, the diazotized compound was coupled with 1 mole of a monoazo compound shown by the following formula in an aqueous medium at temperature of from 0°C to 5°C and at pH of from 7 to 8. After the coupling reaction was finished, the reaction mixture obtained was salted out with a potassium chloride, filtered, and dried to provide a disazo colorant having the following formula (shown by the form of free acid) and the maximum absorption wavelength of 598 nm (water). Dyeing Test 0.2 g of the disazo colorant obtained as described above was dissolved in 200 ml of water and after adding thereto 10 g of Glauber's salt and dissolving therein, 10 g of an unmercerized knitted cotton was immersed in the dyeing bath thus prepared followed by raising the temperature thereof to 60°C over a period of 30 minutes. Thereafter, 3.0 g of sodium carbonate was added thereto and after performing dyeing for one hour at 60°C, the dyed product was washed with water, soaped, washed with water, and dried to provide a product dyed in navy blue color. The dyed product thus obtained was uniformly and densely dyed, and was excellent in light fastness (JIS L-0842) as grade 4 to 5, was very excellent in chlorine fastness (effective chlorine of 20 ppm according to JIS L-0884) as grade 4 to 5, and was excellent in perspiration fastness under sunlight (by alkali method of JIS L-0888A) as Grade 3. EXAMPLE 1 When the disazo colorants of this invention shown in Table 1 described below (shown in the forms of free acids) were prepared according to the same method as shown in comparative Example 1 and cotton cloths were dyed using the colorants by the same manner as in comparative Example 1, uniformly and densely dyed products were obtained. These dyed products obtained were excellent in light fastness (JIS-L0842) as grade 4 to 5, in chlorine fastness (effective chlorine of 20 ppm according to JIS L-0884) as grade 4 to 5, and in perspiration fastness under sunlight (an alkali method of JIS-L-0888A) as grade 3. EXAMPLE 2 The disazo colorants of this invention shown in Table 2 (shown in the forms of free acids) were prepared according to the same method as shown in comparative Example 1 and cotton cloths were dyed with the colorant by the methods as in comparative Example 1. Thus, uniformly and densely dyed products were obtained. Also, these dyed products were excellent in light fastness (JIS L-0842) as grade 4 to 5⁻, chlorine fastness (effective chlorine of 20 ppm according to JIS L-0884) as grade 4 to 5, and perspiration fastness under sunlight (alkali method of JIS L-0888A) as grade 3.

Claims: Water-soluble disazo colorants represented, in the form of the free acid, by formula (I) wherein, X represents a chlorine or fluorine atom; Y represents a chlorine atom or -OR¹, wherein R¹ represents an alkyl group or -CH₂CH=CH₂ and Z represents -CH=CH₂, -CH₂CH₂Cl, or -CH₂CH₂OSO₃H with the proviso that when X is a chlorine atom and the residue is attached to the meta position of the benzene ring with respect to the azo group, Y does not represent a methoxy or ethoxy group. The water-soluble disazo colorants as in claim 1, wherein Y is a chlorine atom or -OR¹ wherein R¹ is an alkyl group having 1 to 8 carbon atoms or -CH₂CH=CH₂. The water-soluble disazo colorants as in claim 1, wherein Y is a chlorine atom or -OR¹ wherein R¹ is an alkyl group having 1 to 4 carbon atoms, or -CH₂CH=CH₂. The water-soluble disazo colorants as in claim 1, wherein the colorants are represented, in the form of the free acid, by the formula (I-i) wherein X' is a chlorine or fluorine atom, Y' is a chlorine atom or -OR 1' wherein R 1' is an alkyl group having 1 to 8 carbon atoms, or -CH₂CH=CH₂ ; and Z' is -CH=CH₂, -CH₂CH₂Cl or -CH₂CH₂OSO₃H; with the proviso that when X' is a chlorine atom, Y'does not represent a methoxy or ethoxy group. The water-soluble disazo colorants as in claim 1, wherein the colorants are represented, in the form of the free acid, by the formula (I-ii) wherein X" represents a chlorine or fluorine atom, Y" represents -OR 1" wherein R 1" represents an alkyl group having 1 to 4 carbon atoms and Z" represents -CH=CH₂, -CH₂CH₂Cl, or -CH₂CH₂OSO₂H; with the proviso that when X" is a chlorine atom, Y" does not represent a methoxy or ethoxy group. The water-soluble disazo colorants as in claim 1, in the form of a free acid by the formula (I-a) wherein y¹ represents a chlorine atom, -OCH₃ or -OC₂H₅ group, or formula (I-b) wherein Y² represents a chlorine atom, or -OCH₂CH=CH₂ group. The use of the disazo colorants of formula (I) according to Claim 1 for dyeing cellulose and nitrogen containing fibers.

Inventors: HIHARA, TOSHIO, HIMENO, KIYOSHI, SHIMIZU, YUKIHARU
Applicants: MITSUBISHI KASEI CORPORATION
Application year: 1987
Main classification: C09B62
IPC codes: C09B62