JP4979733B2 - Black dye composition - Google Patents

Description

  The present invention relates to an aqueous black dye composition used for ink for writing instruments such as ballpoint pens and sign pens or ink for ink jet recording.

  C. I. Direct black 19 is a synthetic dye and is widely used as a black dye. This dye is generally a tetrakisazo compound (see Color Index Structure No. 35255). However, commercially available C.I. I. In addition to the tetrakisazo compound, the direct black 19 contains a polyazo compound of tetrakis or higher, and a lower azo compound such as a trisazo, disazo, or monoazo compound. In commercial products, by-products are intentionally included in order to adjust the physical properties and hue of the dye.

  For example, JP-A-57-115468 (Patent Document 1) describes an aqueous black ink composition containing 20 to 60% of a tetrakisazo compound and 80 to 40% of a trisazo compound as a by-product. . JP-A-2002-3740 (Patent Document 2) describes a black dye composition containing a tetrakisazo compound and a disazo compound, and a black dye composition further containing a trisazo compound. JP-A-56-22370 (Patent Document 3) discloses C.I. I. The direct black 19 type direct dye is described for a dye whose peak ratio is measured by liquid chromatography and the measured value of the peak ratio is 1.0 or less.

  C. I. The direct black 19 is generally manufactured by the following method. First, p-nitroaniline is diazotized, and H acid is coupled thereto to form the formula

The nitroazo compound represented by this is obtained. This nitroazo compound is reduced to give the formula

The disazo compound represented by this is obtained. The terminal amino group of the disazo compound is diazotized using nitrite. The phenylenediamine is then coupled to the diazotized disazo compound to give the formula

The tetrakisazo compound represented by these is obtained.

  In Patent Documents 1 and 2, as shown in Scheme 1 below, the nitroazo compound (Compound 1) is incompletely reduced to leave an unreacted nitro group, thereby finally disazo compound (Compound 2). ) And trisazo compound (compound 3).

スキーム１

Scheme 1

  However, it is difficult to control the progress of such a reduction reaction, and even if the amount of reducing agent, reaction time, and temperature are controlled, partial reduction of the nitro group cannot be performed with good reproducibility. As a result, since the composition of the mixture after reduction is not constant, the composition of the final product is not constant, and the physical properties and hue of the black dye composition vary.

  In addition, a yellow component is easily generated in the conventional manufacturing method, which not only affects the solubility and dissolution stability of the dye, but also yellows the resin portion of writing instruments and recording devices, and a liquid stopper used for ballpoint pens and the like. It is also regarded as a problem from the viewpoint of appearance, such as coloring yellow. In particular, when used for ink jet recording, the yellow component accumulates on the head portion, so that the flight path and landing point of the ink droplet change gradually, resulting in a problem that the recording accuracy deteriorates.

JP 57-115468 A JP 2002-3740 A JP 56-22370 A

  The present invention solves the above-mentioned conventional problems, and the object thereof is a black dye which has no variation in physical properties, hue, etc., has a small yellow component content, and is excellent in solubility and stability over time. It is providing the composition and its manufacturing method.

  The present invention has the formula

10-30% tetrakisazo compound represented by the formula

And formula

A trisazo compound represented by the formula:

A black dye composition containing 2 to 15% of a disazo compound represented by the formula (1) is provided, whereby the above object is achieved.

  The black dye composition of the present invention contains substantially no nitroazo compound.

  In the present specification, the ratio represented simply as “%” means the area% calculated from the peak area of the high performance liquid chromatography analysis result. The high performance liquid chromatography analysis may be performed according to the conditions described in the examples. A nitroazo compound is an azo compound having a nitro group as a substituent on an aromatic ring.

  Compared to conventional dye compositions, the black dye composition of the present invention has a low content of tetrakisazo compounds relative to trisazo compounds and disazo compounds, and further contains substantially no nitroazo compounds, so that it has high solubility in aqueous media. And has excellent dissolution stability.

  Further, by using the production method of the present invention, the diazotization rate of the disazo compound (IV) can be controlled, and a dye composition having stable physical properties and hue can be obtained with good reproducibility.

  In the black dye composition of the present invention, the tetrakisazo compound (I) is contained in an amount of 10 to 30%, preferably 13 to 25%. If the amount of the tetrakisazo compound (I) is less than 10%, the water resistance of the dyed matter or recorded matter may be lowered, and if it exceeds 30%, the solubility and stability in water may be lowered.

  The trisazo compound (II) is contained in an amount of 40 to 60%, preferably 45 to 55%. When the amount of the trisazo compound (II) is less than 40%, the amount of the tetrakisazo compound is often 30% or more, which may reduce the solubility and stability in water. Further, when the trisazo form exceeds 60%, the formation of tetrakisazo form and disazo form is reduced, and the desired performance may not be obtained.

  The disazo compound (III) is usually contained in an amount of 2 to 15%, preferably 4 to 12%. When the amount of the disazo compound (III) exceeds 15%, the hue is biased to reddish, which causes a deviation from the hue expected for the direct black 19. Further, the water resistance of the recorded matter is lowered.

  Further, the black dye composition of the present invention does not substantially contain a nitroazo compound or is not detected in instrumental analysis such as high performance liquid chromatography.

  The black dye composition of the present invention is prepared, for example, by a method including the following steps.

Step 1): Reaction formula of p-nitroaniline and H acid

P-nitroaniline represented by the formula:

H acid represented by the formula

The nitroazo compound represented by this is obtained.

  In this reaction, the production purity of the nitroazo compound (V) becomes the best by charging p-nitroaniline in an amount of 2.0 to 2.3 moles of H acid. The diazotized p-nitroaniline is preferably added to the H acid solution for 20 to 60 minutes, preferably 30 to 45 minutes. The purity of the produced nitroazo compound (V) is lowered even if the time required for charging is longer or shorter than this.

Step 2): Reduction Reaction This nitroazo compound (V) is completely reduced to give the formula

Is obtained.

In the reduction of the nitroazo compound (V), an amount required to completely reduce the charged p-nitroaniline, for example, 1.2 to 1.8 times the molar amount of reducing agent in the case of sodium sulfide is used. To react. As the reducing agent, for example, a sulfide such as sodium sulfide, sodium hydrogen sulfide, and sodium polysulfide, preferably sodium sulfide (Na ₂ S) is used. The reaction temperature and reaction time are controlled so that all nitro groups are reduced and no excessive reaction occurs.

  That is, at this point, the nitroazo compound (V) and the formula

The azo compound which has an unreacted nitro group like the nitroazo compound represented by these does not exist in a reaction liquid. Therefore, in the subsequent reaction step, for example, the formula

A nitroazo compound represented by the formula does not form. Therefore, the black dye composition of the present invention contains substantially no nitroazo compound.

Step 3): Diazotization Reaction A part of the terminal amino group of the disazo compound (IV) is diazotized. Therefore, the amount of nitrite (for example, sodium nitrite) used for diazotization is 0.8 to 1.4 times mol, preferably 1.0 to 1.2 times mol for the H acid used in Step 1. And As a result, the reaction solution contains an azo isomer represented by the following (Xa) to (Xc) and an unreacted disazo isomer (IV).

  When the amount of nitrite used for diazotization is 1.4 times mol or more with respect to the molar amount of H acid used (at the time of charging), the amount of tetrazo compound (Xa) produced increases, and as a result, the next step After the coupling reaction with m-phenylenediamine, the amount of tetrakisazo dye (I) produced often exceeds 30% by weight, and the solubility and stability of the resulting dye composition in water are reduced. . In addition, when the amount of nitrite used is 0.8 mol or less, the amount of tetrazokisazo dye (I) produced is reduced, the water resistance of printing when water-based ink is used, and the hue becomes blue, as a black dye. It is not preferable.

Step 4): pH adjustment of the reaction solution The pH of the reaction solution obtained is adjusted to 1 to 4 using a basic aqueous solution (for example, an aqueous sodium hydroxide solution or an aqueous sodium carbonate solution). As a result, m-phenylenediamine (second coupling component) to be added for coupling thereafter is prevented from being diazotized in the tetrazo liquid, and self-coupling between m-phenylenediamines is suppressed. Can do.

  In addition, when m-phenylenediamine self-couples, a monoazo compound will produce | generate. Such a monoazo compound is considered to be a generation source of a yellow component which has been a problem in the past.

  The reason why the pH of the reaction solution is less than 1 is that phenylenediamine is diazotized by the nitrite remaining in the reaction solution in a trace amount, and this couples with other phenylenediamines to produce a monoazo component as an impurity. It becomes. On the other hand, if it exceeds 4, the diazonium salt is decomposed, which causes the purity of the product to decrease.

Step 5): Coupling type

Is coupled to a diazotized disazo compound. That is, 1.0 to 1.3 times moles of phenylenediamine of the nitrite charged in step 3) is reacted with the reaction solution adjusted in pH. As a result, the black dye composition of the present invention containing a predetermined amount of tetrakisazo compound (I), trisazo compounds (II) and (III), and disazo compound (IV) is obtained. Even if the amount of phenylenediamine is large or small, it causes the purity of the produced dye to decrease.

Step 6) Liquidation including activated carbon treatment After that, the reaction solution may be brought into contact with activated carbon to further reduce the yellow component content. For example, when adjusting the aqueous solution of the dye, 1.0 to 10.0% (w / v) of activated carbon is added to the total amount of the aqueous solution, and heat treatment is performed to almost remove the yellow component in the dye mixture. can do.

  The obtained dye composition is mixed with an aqueous medium (for example, water, ion exchange water, ion exchange water containing a preservative, ion exchange water containing an alcohol-based solvent, etc.) in an amount of 15 to 30% by weight. Thus, a concentrated solution having good dissolution stability and stability over time can be obtained.

  In addition, the dye composition may be an aqueous medium (for example, water, ion exchange water, ion exchange water containing a preservative, ion exchange water containing an alcohol solvent or a surfactant, etc.) in an amount of 1 to 15% by weight. )) To make ink for writing instruments such as ballpoint pens and sign pens.

  In addition, the dye composition may be used in an amount of 1 to 10% by weight of an aqueous medium (for example, water, ion-exchanged water, ion-exchanged water containing a preservative, ion-exchanged water containing an alcohol solvent or a surfactant, etc. Inkjet recording ink.

  The present invention will be specifically described by the following examples, but the present invention is not limited thereto. In the following description, “parts” means “parts by weight”.

Example 1
Step 1) Synthesis of Nitroazo Compound (V) 22.0 parts of sodium carbonate was dissolved in 1000 parts of water, and 117.0 parts of H acid (1-amino-8-naphthol-3,6-disulfonic acid) was added. . After heating to 60 ° C. and confirming that the H acid was dissolved, the solution was cooled to 0 ° C. or lower. At this time, the pH of the reaction mixture was 6.8. On the other hand, 290 parts of concentrated hydrochloric acid (35%) was added to 300 parts of water, and 107.6 parts of p-nitroaniline was added thereto and heated to 60 ° C. to dissolve. After confirming complete dissolution, the mixture was cooled to 50 ° C. or lower, and further 40 parts of concentrated hydrochloric acid was added. The mixture was allowed to cool or ice was added to cool to −5 ° C. To this was added 153.2 parts of a 36% aqueous sodium nitrite solution at once, and the mixture was stirred for 20 minutes while maintaining the liquid temperature at 0 to 5 ° C. to diazotize. After adding 5 parts of sulfamic acid to remove nitrous acid, this diazo solution was added dropwise to the previously prepared H acid solution over 40 minutes, and after adding all the diazo solutions, the mixture was further maintained for 90 minutes while maintaining 0-5 ° C. Stir. After gradually adding 470 parts of 20% aqueous sodium hydroxide solution to pH 9.1, the mixture was stirred at 10 ° C. for 3 hours and further stirred overnight at room temperature.

  When this reaction solution was analyzed by HPLC (high performance liquid chromatography), the HPLC purity of the nitroazo compound (V) was 75.5% in terms of the peak area (FIG. 1).

  The measurement of HPLC (high performance liquid chromatography) was performed under the following analysis conditions. As a high performance liquid chromatograph analyzer, a product name LaChrom7000 series HPLC manufactured by Hitachi, Ltd. was used.

Analysis conditions <br/> Column (stationary phase)
Filler: ODS-L column Size: 4.6 x 250 mm
Eluent (mobile phase)
Eluent A: acetonitrile: THF: H ₂ O = 31: 13: 56, Pic A reagent was added at 15 ml / L.
Measurement conditions Flow rate: 1 ml / min Temperature: 45 ° C
Detection wavelength: 313 nm
This measurement was performed without applying a gradient.

Step 2) The reduction reaction mixture of the nitroazo compound (V) was adjusted to 15 ° C., and 141.9 parts of sodium sulfide hydrate (Na ₂ S · nH ₂ O, content as Na ₂ S 60%) was vigorously stirred. The mixture was gradually added and stirred at 30 ° C. or lower for 1 hour. After confirming that the reaction solution was completely dissolved, 320 parts of concentrated hydrochloric acid was added dropwise over 15 minutes, heated to 60 ° C., and further stirred for 30 minutes. The precipitate was filtered while hot, washed with dilute hydrochloric acid (0.4%) on Nutsche until the color of the filtrate changed to purple, and then pressed to obtain a press cake A of disazo body (IV).

  When this cake A was subjected to HPLC analysis, the HPLC purity of the disazo compound (IV) was 79.0% in terms of the peak area (FIG. 2).

Steps 3) to 5) diazotization reaction, pH adjustment and coupling: diazotization of disazo compound (IV) and coupling with phenylenediamine 300 parts of water containing the above press cake A of disazo compound (IV) is added to 20%. After adding 90 parts of an aqueous sodium hydroxide solution, water was further added to bring the total amount to 1200 parts, followed by stirring at 50-60 ° C. for 1 hour. Further, an aqueous sodium hydroxide solution was added to adjust the pH of the solution to 9.5, and the mixture was stirred at the same temperature for 1 hour and filtered with a filter paper to obtain a reaction mixture containing the disazo compound (IV).

  After gradually adding 220 parts of concentrated hydrochloric acid to the reaction mixture, ice was added to bring the liquid temperature to 5 ° C. After dropwise addition of 78.0 parts of 36% aqueous sodium nitrite solution over 30 minutes, the mixture was stirred at 5 ° C. or lower for 3 hours. Sulfamic acid was added to remove excess nitrous acid. To this, 596 parts of a 20% aqueous sodium carbonate solution was added dropwise over 30 minutes, and the pH of the reaction mixture was adjusted to 3.0.

  On the other hand, 52 parts of m-phenylenediamine was added to 600 parts of water and heated to 40 ° C. to completely dissolve, and then ice was added to reach 20 ° C. This was added to the reaction mixture, ice was added as appropriate to adjust the temperature to 5 ° C. or lower, and the reaction was carried out overnight at 13 ° C. while adjusting the pH to 8.5 to 9.5 by adding a 20% aqueous sodium hydroxide solution. I let you. A solution prepared by diluting concentrated sulfuric acid into ice was prepared and added dropwise to the reaction mixture to make it pH acidic. After heating to 60 ° C., it was filtered while hot, washed with water on Nutsche until the color of the filtrate changed to blue, and then pressed to obtain press cake B of the desired mixture.

Step 6) 600 parts Liquid of water containing activated carbon treatment is heated to 55 ° C., this was put presscake B total amount, was added and stirred for 60 parts of 20% sodium hydroxide solution for 30 minutes at 50-60 ° C. . An aqueous sodium hydroxide solution was added to completely dissolve the pH to 10.3, 30 parts of activated carbon was added, and the mixture was stirred at the same temperature for 1 hour. After adding 15 parts of diatomaceous earth and stirring for a while, it was cooled to 40 ° C. or lower and allowed to stand overnight. After confirming that the pH was 10.3, the solid content was removed using filter paper, and the dye concentration of the filtrate was adjusted to 20% to obtain the target dye aqueous solution (concentrated solution). The yield of the concentrated solution was 1430 parts.

  When the obtained aqueous solution was analyzed by HPLC, the peak area ratio of each component in the dye composition was as follows: trisazo compound 52.6%, tetrakisazo compound (CI Direct Black 19) 15.3%, disazo compound It was 10.9% (FIG. 3).

  Moreover, when a visible absorption spectrum was measured, it was (lambda) max = 652nm (water) (FIG. 4).

Example 2
The synthesis of the nitroazo compound (V) in step 1) and the reduction of the nitroazo compound (V) in step 2) were carried out in the same manner as in Example 1.

Steps 3) to 5) Diazotization reaction, pH adjustment and coupling: diazotization of disazo compound (IV) and coupling with phenylenediamine When adding an aqueous sodium hydroxide solution to dissolve the disazo compound, activated carbon 12 The composition was synthesized in substantially the same manner as in Example 1 except that 1 part was added and stirred at the same temperature for 1 hour.

  When the yellow component confirmation test described below was conducted, it was confirmed that the yellow component was extremely small.

  Step 6) Liquidation including activated carbon treatment was performed in the same manner as in Example 1.

  When the obtained aqueous solution was analyzed by HPLC, the ratio of the peak area of each component in the dye composition was as follows: trisazo compound 52.4%, tetrakisazo compound (CI direct black 19) 14.4%, disazo compound It was 6.3% (FIG. 5).

Example 3
The synthesis of the nitroazo compound (V) in the first coupling step and the reduction of the nitroazo compound in the reduction step were performed in the same manner as in Example 1.

Steps 3) to 5) Diazotization reaction, pH adjustment and coupling: diazotization of disazo compound (IV) and coupling with phenylenediamine In diazotization of disazo compound, 10% water instead of 20% aqueous sodium carbonate solution The compound was synthesized in the same manner as in Example 1 except that 584 parts of an aqueous sodium oxide solution was added dropwise to adjust the pH to 3.0.

  Step 6) Liquidation including activated carbon treatment was performed in the same manner as in Example 1.

  When the obtained aqueous solution was analyzed by HPLC, the ratio of the peak area of each component in the dye composition was as follows: Trisazo compound 52.3%, Tetrakisazo compound (CI Direct Black 19) 15.9%, Disazo compound It was 4.9% (FIG. 6).

Example 4
The synthesis of the nitroazo compound (V) in step 1) and the reduction of the nitroazo compound (V) in step 2) were carried out in substantially the same manner as in Example 1.

Steps 3) to 5) Diazotization reaction, pH adjustment and coupling: diazotization of disazo compound (IV) and coupling with phenylenediamine In diazotization of disazo compound (IV), 85 parts of 36% sodium nitrite aqueous solution was added. The compound was synthesized in the same manner as in Example 1 except that it was used.

  Step 6) Liquidation including activated carbon treatment was performed in the same manner as in Example 1.

  When the obtained aqueous solution was analyzed by HPLC, the ratio of the peak area of each component in the dye composition was as follows: trisazo compound 43.5%, tetrakisazo compound (CI Direct Black 19) 26.9%, disazo compound It was 2.55% (FIG. 7).

Comparative Example 1
Synthesis of tetrakisazo-rich direct black 19

  The synthesis of the nitroazo compound (V) in step 1) and the reduction of the nitroazo compound in step 2) were carried out in the same manner as in Example 1.

Diazotization reaction, coupling with phenylenediamine Into 300 parts of water, put the disazo presscake A obtained in the reduction step, add 90 parts of a 20% aqueous sodium hydroxide solution, and then add water to make the total amount. Was 1200 parts and stirred at 50-60 ° C. for 1 hour. Further, an aqueous sodium hydroxide solution was added to adjust the pH of the solution to 9.5, and the mixture was stirred at the same temperature for 1 hour and filtered with a filter paper to obtain a disazo aqueous solution. Ice was added to this aqueous solution to bring the liquid temperature to 0 ° C. or lower, 140.4 parts of 36% aqueous sodium nitrite solution was added, 345 parts of concentrated hydrochloric acid was added at once, and the mixture was stirred at 10 ° C. or lower for 3 hours. Sulfamic acid was added to remove nitrous acid.

  On the other hand, 75.0 parts of m-phenylenediamine was added to 600 parts of water, heated to 40 ° C. and completely dissolved, and then ice was added to reach 20 ° C. This was added to the tetrazo solution, and ice was added as appropriate to adjust the temperature to 5 ° C. or lower, followed by stirring at the same temperature for about 1 hour. A 20% aqueous sodium hydroxide solution was added to adjust the pH to 8.5 to 9.5, and the mixture was reacted at 13 ° C. overnight.

  A solution prepared by diluting 36 parts of concentrated sulfuric acid into ice was prepared and added dropwise to the tetrakisazo solution to make the pH of the solution acidic (pH 3.0). After heating to 60 ° C., it was filtered while hot, washed with water on Nutsche until the color of the filtrate changed to blue, and then pressed to obtain press cake B of the desired mixture.

  As a result of HPLC analysis of the obtained press cake B, the ratio of the peak area of each component in the dye composition was 7.3% trisazo compound, 56.1% tetrakisazo compound (CI Direct Black 19), The disazo form was 2.4% (FIG. 8).

Comparative Example 2
The synthesis of the nitroazo compound (V) in step 1) and the reduction of the nitroazo compound (V) in step 2) were carried out in substantially the same manner as in Example 1.

Steps 3) to 5) Diazotization reaction, pH adjustment and coupling: diazotization of disazo compound (IV) and coupling with phenylenediamine In diazotization of disazo compound (IV), 90 parts of 36% sodium nitrite aqueous solution was added. The compound was synthesized in the same manner as in Example 1 except that it was used.

  About the process 6), except having not performed an activated carbon process and a diatomaceous earth process, it processed substantially like Example 1, and liquid-ized.

  When the obtained aqueous solution was analyzed by HPLC, the ratio of the peak area of each component in the dye composition was as follows: trisazo compound 44.8%, tetrakisazo compound (CI Direct Black 19) 31.7%, disazo compound It was 2.9% (FIG. 9).

Comparative Example 3
Preparation of dye composition by the method described in JP-A-2002-3740, Example 1 According to a conventional method, 22.1 g (0.16 mol) of p-nitroaniline is diazotized with hydrochloric acid and neutralized with sodium hydroxide. The solution was mixed with an aqueous solution containing 31.9 g (0.1 mol) of the prepared H acid, and was first acid-coupled. Next, an aqueous solution of 14 g of anhydrous sodium carbonate was added to allow alkaline coupling. The HPLC spectrum of the preparation thus obtained is shown in FIG.

  HPLC spectrum in FIG. 10: A peak of a mononitro compound (formula A) was observed at a retention time of 4.88 minutes, and a nitroazo compound (formula B, which is the same as the nitroazo compound represented by formula V above) at 11.04 minutes. ) Was observed. In addition, as for the area ratio in HPLC, A component was 44.4% and B component was 49.7%.

（式Ａ）

(Formula A)

（式Ｂ）

(Formula B)

  Thereafter, 34.4 g (0.61 mol) of sodium hydrosulfide was added for reduction, and the resulting dye intermediate was salted out and acidified, and then filtered out. The HPLC spectrum of the obtained filtrate is shown in FIG.

  The HPLC spectrum of FIG. 11: a peak of the reduced product (formula C) of the mononitro compound (A) was observed at a retention time of 3.47 minutes, and the reduced product of the nitroazo compound (B) (formula D, which was The same peak as that of the disazo compound of the present invention represented by the above formula IV was observed. As for the area ratio in HPLC, C component was 44.7% and D component was 53.9%.

（式Ｃ）

(Formula C)

（式Ｄ）

(Formula D)

  This filter cake is neutral, dissolved in water, diazotized, added with an aqueous solution containing 16.8 g (0.16 mol) of m-phenylenediamine, coupled, and the dye component is crystallized by salt / acid precipitation. , Filtered out. The HPLC spectrum of the taken out filtrate is shown in FIG.

  HPLC spectrum of FIG. 12: A peak of a disazo isomer represented by (formula E) is observed at a retention time of 4.96 minutes, and a peak of a tetrakisazo isomer represented by (formula F) is observed at 9.48 minutes. It was. In addition, the tetrakisazo body of the formula F is the same as the tetrakisazo body of the present invention represented by the above formula I. As for the area ratio in HPLC, F component was 40.1% and E component was 42.1%.

（式Ｅ）

(Formula E)

（式Ｆ）

(Formula F)

Evaluation methods

1. Initial solubility test The evaluation method is to prepare a 20% by weight dye aqueous solution of a dye composition (sodium salt) at room temperature,
Completely dissolved: ○
Insoluble matter: x
It was.

2. Re-dissolution test First, the filtration time in a 100 μm 1 μm membrane filter (cellulose nitrate) of the obtained 20% by weight dye aqueous solution was measured. On the other hand, a 20% by weight dye aqueous solution was frozen overnight in a freezer, and was left at room temperature the next morning and thawed for 1 day. The thawed product was lightly shaken and then 100 ml was taken, and the filtration rate was similarly measured using a 1 μm membrane filter.

Evaluation method is F = (filtering time of aqueous dye solution before thawing) / (filtering time of aqueous dye solution after thawing)
The measurement value F is 0.7 or more as A, 0.7 to 0.5 as B, 0.5 to 0.35 as C, and 0.35 or less as D. . In addition, in the filtration test after freezing and thawing, no residue was confirmed when a residue was found on the filter paper.

  Evaluation about what was synthesize | combined in Examples 1-4 was A in all, and the filtration residue was not confirmed on the filter. On the other hand, the evaluation of Comparative Examples 1 and 3 was impossible, and the evaluation of Comparative Example 2 was B.

3. Confirmation of Yellow Component The obtained 10% by weight aqueous dye solution was adjusted to 25 ° C., and multifiber cloth (manufactured by Color Dyeing Co., Ltd.) cut into an appropriate size was immersed for 60 seconds. After 60 seconds, the dyed cloth was washed with a large amount of water, and then exposed to water for 5 minutes to wash out excess dye, and then the cloth was naturally dried, and the degree of coloring of the acetate fabric portion was visually determined. .

Coloration is hardly confirmed: ○
Coloration is confirmed: ×

  About Examples 1-4, the coloring of the yellow component was hardly confirmed. On the other hand, the coloring of the yellow component was confirmed about Comparative Examples 1-3.

  Table 1 summarizes the results of Examples and Comparative Examples.

^＊比較例３のジスアゾ体の欄に記載される面積割合(４２．１)％は、上記比較例３中の式Ｅで示される化合物の面積割合である。この式Ｅで示される化合物は上記式Ｅに示すとおり、上記式IVで表わされる本発明のジスアゾ体とは異なる化合物である。

^{* The} area ratio (42.1)% described in the column of the disazo isomer of Comparative Example 3 is the area ratio of the compound represented by Formula E in Comparative Example 3 above. The compound represented by the formula E is a compound different from the disazo compound of the present invention represented by the above formula IV as represented by the above formula E.

The HPLC spectrum of a nitroazo compound (V) is shown. The HPLC spectrum of a disazo body (IV) is shown. The HPLC spectrum of the dye aqueous solution of Example 1 is shown. The visible absorption spectrum of the dye aqueous solution of Example 1 is shown. The HPLC spectrum of the dye aqueous solution of Example 2 is shown. The HPLC spectrum of the dye aqueous solution of Example 3 is shown. The HPLC spectrum of the dye aqueous solution of Example 4 is shown. The HPLC spectrum of the dye aqueous solution of the comparative example 1 is shown. The HPLC spectrum of the aqueous dye solution of Comparative Example 2 is shown. 2 shows the HPLC spectrum of the preparation of Comparative Example 3. The HPLC spectrum of the filtrate of the comparative example 3 is shown. The HPLC spectrum of the filtrate of the comparative example 3 is shown.

Claims (4)

formula

Tetrakisazo compound represented by the formula

And formula

Trisazo compound represented by the formula

The tetrakisazo compound is contained in an amount of 10 to 30%, the trisazo compound is contained in a ratio of 1.62 to 3.64 with respect to the tetrakisazo compound 1, The disazo body is contained in a ratio of 0.09 to 0.71 with respect to the tetrakisazo body 1 (where% represents an area% calculated from the peak area of the analysis result of high performance liquid chromatography, Calculated as a ratio from area%)
A black dye composition not containing a nitroazo compound represented by the following formulas (V) to (IX).

  A concentrated solution containing 15 to 30% by weight of the black dye composition according to claim 1 in an aqueous medium.   An aqueous ink composition containing 0.5 to 15% by weight of the black dye composition according to claim 1 in an aqueous medium.   A water-based ink composition for inkjet recording, comprising 1 to 10% by weight of the black dye composition according to claim 1 in an aqueous medium.

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