JPH11140365A - Aqueous ink composition for ink jet recording - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an aq. ink compsn. for ink jet recording which does not clog an ink delivery nozzle, exhibits good delivery stability and delivery response, provides high-quality prints, and is excellent in long-storage stabilty by using a specific alkylenebismelamine deriv. as a white pigment. SOLUTION: An alkylenebismelamine deriv. of the formula [wherein R<1> , R<2> , R<3> , R<4> , R<7> , R<8> R<9> and R<10> are each independently H or 1-4C alkyl provided R<1> may combine with R<2> to form, together with a nitrogen atom, a heterocyclic group and so may R<3> with R<4> , R<7> with R<8> , and R<9> with R<10> ; R<5> and R<6> are each independently H, 1-4C alkyl, or an alicyclic group; and A is 2-3C alkylene] is used as an org. white pigment. Pref., the content of the deriv. in the aq. ink compsn. is 15-35 wt.% (based on the total amt. of the compsn.) and the average particle size of the deriv. is 0.2-0.4 μm. An ammonium salt of a water- soluble resin is used as a resin for dispersing the pigment.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aqueous ink composition for ink jet recording, and more particularly to an aqueous ink composition for ink jet recording containing an organic white pigment as a colorant.

[0002]

2. Description of the Related Art Conventionally, aqueous dye inks have been mainly used as recording liquids for writing instruments and ink jet recording.
2. Description of the Related Art In recent years, aqueous pigment inks using pigments have attracted attention in order to impart light resistance and water resistance to recorded images.

[0003] In inks for ink jet recording, most of white pigments are inorganic pigments. For example, Japanese Unexamined Patent Publication
JP-A-287492 and JP-A-6-322306 describe aqueous pigment inks containing water, a water-soluble organic solvent, titanium dioxide fine particles or alumina fine particles. Japanese Patent Application Laid-Open No. 9-40895 discloses that a self-water dispersible resin dyed with a colored resin particle containing a white pigment selected from titanium white, silica, zinc oxide and alumina is dispersed in an aqueous liquid medium. A microcapsule ink composition for inkjet recording is described. JP-A-6-220375 describes an aqueous ink composition for inkjet recording containing a pigment such as titanium oxide, an aqueous liquid medium, and a mono- or sesquiterpene-based compound. JP-A-6-145570 discloses a pigment such as titanium oxide, a polymer dispersant, water, and a water-insoluble resin emulsion, and the ratio of the total amount of the pigment and the solid content of the resin emulsion to the polymer dispersant is determined. An ink composition for inkjet recording in a ratio of 3: 1 to 200: 1 is described.

However, in an ink composition using inorganic white pigments such as titanium oxide, fine silica powder, calcium carbonate, white carbon, and talc clay, the specific gravity of these white inorganic pigments is extremely large, so that the inks settle in a low-viscosity liquid. It is easy to generate solid matter at the bottom of the container, and clogging is likely to occur at the ink discharge nozzle.

As an exception, JP-A-57-96066 describes a white ink composition for jet printing comprising water, a water-soluble solvent, a water-soluble resin and a colorant, wherein the colorant is a plastic pigment. However, this ink composition has insufficient concealing properties and is not practical for inkjet recording.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems in the prior art,
The purpose is to print without clogging with the ink discharge nozzle, show good discharge stability and discharge responsiveness, high print density, high quality printing without blurring and no print unevenness. An object of the present invention is to provide a white pigment-containing water-based ink composition for inkjet recording, which has high quality and excellent stability over time during long-term storage.

[0007]

SUMMARY OF THE INVENTION The present invention provides

[0008]

Embedded image

Wherein R ¹ , R ² , R ³ , R ⁴ , R ⁷ , R ⁸ ,
R ⁹ and R ¹⁰ each independently represent a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, provided that R ¹ and R ² , R ³ and R ⁴ , R ⁷ and R ⁸ , and R ⁹ R ¹⁰ may form a heterocyclic ring with a nitrogen atom, R ⁵ and R ⁶ each independently represent a hydrogen atom, an alkyl group having 1 to 4 carbon atoms or an alicyclic group, and A has 2 carbon atoms. Represents alkylene groups of 1 to 3. The present invention provides an aqueous ink composition for inkjet recording, comprising an alkylenebismelamine derivative having the structure represented by the formula (1) as an organic white pigment and a fluorescent organic white pigment.

The inventor of the present invention prepares an aqueous ink composition for ink jet recording containing an organic white pigment, whereby the dispersibility of the white pigment is good, the viscosity of the ink is appropriately adjusted, and the ejection stability and ejection are improved. It has been found out that the aqueous ink composition of the present invention is excellent in responsiveness, has good stability over time during long-term storage, and does not cause clogging.

[0011]

DETAILED DESCRIPTION OF THE INVENTION The aqueous ink composition of the present invention contains at least one organic white pigment as an essential component. The organic white pigment has the same concealing property as a titanium oxide-based white pigment, and the pigment itself is an organic substance. Therefore, the specific gravity of the pigment particles is an inorganic white pigment (for example, titanium oxide about 3.
It is remarkably small as compared with 8) and is stably dispersed in the aqueous ink for inkjet recording for a long period of time. That is, titanium oxide-based white pigments generally used as a white colorant,
Since the specific gravity is higher than other components in the water-based ink, even if it is dispersed at first, it gradually sinks and easily forms a hard cake or the like. The organic white pigment used in the present invention has a smaller specific gravity difference than other components in the ink, and the initial dispersion state that is stable for a long period of time is preserved. The specific gravity of the organic white pigment is preferably 2 or less, more preferably 1.2 to 1.8.

The organic white pigment used in the present invention is more uniformly dispersed with the chromatic organic pigment when the aqueous white ink is prepared by mixing with other chromatic organic pigments and preparing a dispersed aqueous ink. Can be mixed. In addition, when printing is performed by an ink jet apparatus, color separation due to separation of a white pigment and other chromatic organic pigments hardly occurs, and printing with higher image quality can be obtained.

Further, the ink composition using the organic white pigment of the present invention has excellent dispersion stability, and therefore, compared to the ink composition using the conventional titanium oxide-based white pigment, a dispersant or a conventionally used dispersant is used. It is most suitable for ink jet recording inks in which the type or amount of the dispersion stabilizer can be reduced and it is difficult to add a large amount of additives.

For example, after a dispersant adheres to an orifice or the like, it is not re-dissolved or re-dispersed, and clogging and non-discharge of liquid droplets are likely to occur. When continuous ejection over a long period of time and high-speed printing are performed, resistance is caused in the path to the nozzle tip, and it is possible to prevent the ejection from becoming unstable and making smooth recording difficult. Further, the burden on the dispersion stabilizing device and the ejection stabilizing device of the ink jet head in the ink jet device can be reduced.

When the organic white pigment according to the present invention is used as a white ink, it is generally used in an amount of 10 to 10% based on the total amount of the ink.
The content is 40% by weight, preferably 15 to 35% by weight, more preferably 20 to 35% by weight. When the content of the organic white pigment is less than 10% by weight, the printing or writing density becomes insufficient, and when it exceeds 40% by weight, the organic white pigment is easily aggregated and sedimented, and the orifice of the recording head of the ink jet printer is sufficiently stable. This is because a proper ejection cannot be obtained.

When used in combination with other coloring agents for the purpose of enhancing visibility, it is generally contained in an amount of 1 to 30% by weight, preferably 2 to 20% by weight, based on the total amount of the ink. It is desirable. If the amount is less than 1% by weight, a sufficient effect cannot be exerted in many cases.

Organic white pigments and fluorescent organic white pigments composed of an alkylenebismelamine derivative exhibit the same concealing properties as titanium oxide-based white pigments, and have high whiteness (titanium oxide has little absorption in the yellow part). And water resistance is also good. Also, unlike inorganic pigments, the hardness is low,
Even when the ink for ink jet recording is repeatedly discharged for a long period of time, parts such as the head of the ink jet apparatus have little wear and are suitable for ink for ink jet recording.

The alkylenebismelamine derivative represented by the above formula (I) has a negative AMES test, and is particularly preferable for use in an aqueous ink composition for ink jet recording which requires safety.

Specific product names of the organic white pigment include Shigenox OWP and Shigenox OWP.
L, ShigenoxFWP, ShigenoxFW
G, ShigenoxUL, ShigenoxU (all of which are manufactured by Hakkor Chemical Co., Ltd., all of which are trade names).

The pigment used in such an aqueous pigment ink generally does not exhibit hydrophilicity, and therefore is not easily dispersed alone in water or an aqueous liquid medium. If the pigment is not sufficiently dispersed in the medium, the pigment will settle and agglomerate, resulting in a lack of storage stability or clogging of a fine nozzle. In order to prevent this, it is necessary to disperse and stabilize the pigment in the aqueous liquid medium using a disperser in the presence of a so-called pigment dispersant such as various water-soluble synthetic polymers and surfactants. .

Examples of the pigment dispersant used in the present invention include acrylic acid such as styrene acrylate resin, styrene acrylate resin, maleic acid-modified styrene acrylate resin, styrene methacrylate resin, and styrene methacrylate acrylate resin. Resins such as styrene maleate resin, acrylate maleate resin, styrene acrylate maleate resin, rosin-modified maleic resin; ammonia (water), amines such as maleated alkyd resin (Eg, aliphatic amines, aliphatic alkanolamines and the like), and salts formed with a base compound and water-solubilized. Among the above resins, styrene acrylate resin, styrene maleate resin, maleic acid-modified styrene acrylate resin, and maleated alkyd resin are preferable in consideration of solubility in an aqueous liquid medium and dispersion stability of the pigment.

The ammonium salts of the above resins are particularly preferred as pigment dispersants. When used for inkjet recording,
The above resin has good solubility in water or an aqueous liquid medium, does not adhere to an orifice or the like and solidifies, and does not cause clogging and non-discharge of droplets. Since the pH of the entire ink is adjusted to be slightly alkaline, there is no corrosion of the head. In addition, the use of a pigment dispersant obtained by ammonium chloride improves the water resistance of a printed image. A water-soluble resin such as polyvinylpyrrolidone, polyvinyl alcohol and the like may be partially contained.

Particularly preferred pigment dispersants for use in the present invention are the above resins having a weight average molecular weight of 1,000 to 50,000, preferably 3,000 to 15,000, and an acid value of 50 to 500, preferably 100 to 250, neutralized with an ammonium salt. It is a water-soluble resin obtained by

The pigment dispersant may be used alone or in combination of two or more. The amount used is generally from 1 to 30% by weight, preferably from 5 to 20% by weight, more preferably from 5 to 15% by weight, based on the total amount of the ink.

In order to obtain a high-quality recorded matter having a high recording density, no bleeding and good fastness, the organic white pigment (a) and the pigment dispersant (b) in the aqueous ink composition are used.
Has a weight ratio (a: b) of 100: 25 to 100: 50, preferably 100: 30 to 100: 45.

The aqueous liquid medium used in the aqueous ink composition of the present invention contains water as a main component, but may also contain an organic solvent compatible with water. (Water, a water-miscible organic solvent or a mixture thereof is referred to as an aqueous liquid medium in the present specification.) Examples of suitable organic solvents having compatibility with water include alcohols, polyhydric alcohols, and cellosolves. And carbitols.

Examples of the water-miscible organic solvent include alkyl alcohols having 1 to 4 carbon atoms such as methyl alcohol, ethyl alcohol, n-propyl alcohol, isopropyl alcohol, n-butyl alcohol, sec-butyl alcohol and isobutyl alcohol. Ketones or ketone alcohols such as acetone and diacetone alcohol; ethers such as tetrahydrofuran (THF) and dioxane; alkylene glycols such as ethylene glycol, propylene glycol, diethylene glycol and triethylene glycol; Polyalkylene glycol; ethylene glycol monoethyl ether, propylene glycol monomethyl ether,
Lower alkyl ethers of polyhydric alcohols such as propylene glycol monoethyl ether, diethylene glycol monomethyl ether, dipropylene glycol monomethyl ether and triethylene glycol monoethyl ether; lower alkyl ethers such as polyethylene glycol monomethyl ether acetate and polypropylene glycol monomethyl ether acetate Acetate; glycerin; and pyrrolidones such as 2-pyrrolidone, 2-methylpyrrolidone and N-methyl-2-pyrrolidone.

The water-soluble liquid medium used in the present invention is added for the purpose of dispersing and compatibilizing the colorant, dissolving the resin, adjusting the viscosity of the ink, and the like. The water-soluble liquid medium may be one or a mixture of two or more of the above-mentioned water or water-soluble organic solvents, and the content of the water-soluble liquid medium is 30 to 80% by weight based on the whole ink. The degree is preferred.

In the ink composition of the present invention, besides the above-mentioned organic white pigment, a conventional inorganic pigment, organic pigment or organic dye is appropriately selected as a colorant as long as the object of the present invention is not impaired. The required amount can be included.

Examples of the inorganic pigment include carbon black, cobalt blue and the like.

Examples of organic pigments include phthalocyanine pigments such as cyanine black and phthalocyanine; perinone pigments such as indanthrene blue and indanthrene brilliant orange; Victoria blue lake, methyl violet lake, malachite green, alizarin lake, Lake pigments such as Permanent Red F5R and Lake Red C; azo pigments such as naphthol red, permanent carmine FBB, permanent red FGR, pyrazolone red, condensed azo yellow, condensed azo brown and nickel azo yellow; quinacridone pigments; diketopyrrolopyrroles Pigments; anthraquinone-based pigments such as anthraquinone red and anthraquinone maroon; and isoindolinone-based pigments, dioxazine pigments, thioindigo pigments, and quino And polycyclic pigments such as phthalone pigments.

Examples of the organic dye include water-soluble dyes such as azo dyes, azo metal-containing dyes, azomethine dyes, triphenylmethane dyes, oxazine dyes, indigo dyes, anthraquinone dyes, and phthalocyanine dyes. Is mentioned.

Further, the ink composition of the present invention may contain, if necessary, known materials used in aqueous inks as additives within a range in which the intended object of the present invention can be achieved and the effects can be exhibited. , Can be appropriately selected and used in an appropriate amount. Such additives include, for example, dispersants (surfactants), anti-settling aids, surface tension adjusters, wetting agents, viscosity adjusters, pH adjusters, slow drying agents, preservatives, fungicides And an antifoaming agent.

As the dispersant, any of anionic, cationic, nonionic and amphoteric dispersants can be used. As anionic dispersants, sodium oleate, carboxylate, sulfate, sulfonate, phosphate, alkylbenzene sulfonate, etc., and as cationic dispersant, oleylamine acetate, aminopropylamine dioleate, Examples of nonionic dispersants include tetraalkylammonium salts and the like, and polyethylene glycol derivatives, polyhydric alcohol derivatives, and polyethyleneimine derivatives.

In producing the aqueous ink composition of the present invention, in the step of dispersing the colorant, various methods can be employed using a mill medium and a dispersing (pulverizing) apparatus. Ball mill, attritor,
Examples include an impeller mill, a colloidal mill, a sand mill, a roll mill, a bead mill, and a homomixer. In addition, as a mill medium, glass beads, zirconia beads, magnetic beads, stainless steel beads, and the like are used. The average particle size of the organic white pigment of the present invention obtained in the above step is 1
μm or less, more preferably 0.2 to 0.4 μm
m.

The aqueous ink composition of the present invention comprises an aqueous liquid medium,
A colorant, a pigment dispersant and an appropriate additive are appropriately blended, and the resulting mixture is easily mixed and dispersed by a disperser. It can also be prepared by first preparing a concentrated dispersion of a colorant and then diluting the concentrated dispersion with an aqueous liquid medium or the like. According to the inkjet printer to be used, the aqueous ink composition is filtered and purified with a filter having a pore size of 1/10 or less of the nozzle diameter to remove coarse particles, aggregates, and the like. Is preferred for preventing clogging.

The surface tension of the aqueous ink composition is preferably from 20 to 70 dyn / cm, more preferably from 20 to 50 dyn / cm.
yn / cm. The viscosity of the ink composition is preferably 1 to 15 cps, more preferably 2 to 7 cps.
It is. Further, in order to remove inorganic salts and impurities of the aqueous ink composition, various purification and desalting methods can be selected.

[0038]

The aqueous ink composition using the organic white pigment of the present invention has excellent dispersibility of the pigment. Therefore, when used as a white ink, the aqueous ink composition has excellent concealing properties. Also shows good stability over time during long-term storage, and is excellent in the effect of preventing inconveniences such as aggregation and sedimentation. Also, when used in combination with other organic pigments, compared to the conventional titanium oxide-based white pigment, the organic white pigment used in the present invention and other organic pigments are uniformly mixed, and only the white pigment separates and precipitates. Nothing.

The aqueous ink composition of the present invention does not impair the ejection stability and ejection responsiveness of an ink jet printer, has good recording characteristics, can perform high-speed printing without printing unevenness, and is stable over time during long-term storage. With excellent properties,
Printing with high visibility is possible for a material with low brightness. Furthermore, the recorded characters and figures are excellent in fastness (light fastness and water resistance), the colorant does not flow out even if immersed in water again, and the water resistance is good, and even when exposed to sunlight, the dye ink Excellent light fastness without discoloration.

[0040]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to Examples, but it should be understood that the present invention is by no means limited to these. In the following description, “parts by weight” is replaced by “parts”.
Abbreviated.

Examples 1 to 5 and Comparative Examples 1 to 3 illustrate the white ink composition for ink jet recording of the present invention.

Example 1

[Table 1] Components Compounding amount (part) Organic white pigment (manufactured by Hakkol Chemical Co., Ltd., trade name: Shigenox OWP) Ammonium salt of rosin-modified maleic acid resin 10 Ethanol 5 Ethylene glycol 5 Ion-exchanged water 55

The above ingredients were mixed, dispersed for 8 hours using a bead mill, and then filtered and purified through a filter having a pore size of 5 μm to obtain a white ink composition for ink jet recording.

Embodiment 2

Table 2 Components Compounding amount (parts) Organic white pigment (manufactured by Hakkor Chemical Co., Ltd., trade name: 25 Shigenox OWP) Ammonium salt of styrene maleic acid resin 10 Isopropyl alcohol 5 Ethylene glycol 5 Ion exchange water 55

The above ingredients were mixed and dispersed for 8 hours using a bead mill, followed by filtration and purification with a filter having a pore size of 5 μm to obtain a white ink composition for ink jet recording.

Embodiment 3

Table 3 Components Compounding amount (part) Organic white pigment (manufactured by Hakkol Chemical Co., Ltd., trade name: 25 Shigenox OWP) Ammonium salt of styrene acrylic acid resin 10 Ethanol 5 Ethylene glycol 5 Ion exchange water 55

The above ingredients were mixed and dispersed for 8 hours using a bead mill, followed by filtration and purification through a filter having a pore size of 5 μm to obtain a white ink composition for inkjet recording.

Embodiment 4

Table 4 Components Compounding amount (part) Organic white pigment (manufactured by Hakkol Chemical Co., Ltd., trade name: Shigenox OWP) Ammonium salt of styrene maleic acid resin 12 isopropyl alcohol 5 ethylene glycol 5 Surface tension modifier (trade name, manufactured by Asahi Glass Co., Ltd.) : Surflon S112) 0.1 ion exchange water 47.9

The above ingredients were mixed, dispersed for 8 hours using a bead mill, and then filtered and purified through a filter having a pore size of 5 μm to obtain a white ink composition for ink jet recording.

Embodiment 5

Table 5 Components Compounding amount (part) Organic white pigment (manufactured by Hakkol Chemical Co., Ltd., trade name: Shigenox OWP) Ammonium salt of styrene acrylic resin 14 ethanol 7 ethylene glycol 5 Fungicide (manufactured by Zeneca Corp .: Proxel) 1 XL-2) Ion exchange water 38

The above ingredients were mixed, dispersed for 8 hours using a bead mill, and then filtered and purified through a filter having a pore size of 5 μm to obtain a white ink composition for ink jet recording.

Comparative Example 1 A white ink composition was prepared by mixing the same amount of titanium oxide (trade name: R-900, manufactured by DuPont) in place of the organic white pigment in Example 1, and treating in the same manner as in Example 1. Was prepared.

Comparative Example 2 A white ink composition was prepared by mixing the same amount of titanium oxide (trade name: R-900, manufactured by DuPont) in place of the organic white pigment in Example 2, and treating in the same manner as in Example 2. Was prepared.

Comparative Example 3 The same procedure as in Example 3 was repeated, except that the same amount of titanium oxide (trade name: R-900, manufactured by DuPont) was mixed in place of the organic white pigment in Example 3, and treated in the same manner as in Example 3. Was prepared.

The ink compositions for ink jet recording obtained in Examples 1 to 5 and Comparative Examples 1 to 3 were jetted using a charge modulation type ink jet printer, each ink was jetted, the ink droplets were formed, and Tables 6 and 7 show the results of printing tests of the charged state and the deflected state of the droplet particles, and examination of the ejection characteristics.

Each of the inks was stored at room temperature for 3 months, and the stability of the inks with time was examined. The ejection characteristics of the inks after storage were also examined. Further, black coated paper was used as a material having a low lightness, and white visibility and non-absorbing surface adhesion to the material were examined. The results are shown in the table below.

[0057]

[Table 6]

[0058]

[Table 7]

Examination of Test Results It is clear from the above test results that the white ink composition for ink jet recording of the present invention has a jetting property immediately after production, a stability with time at room temperature for 3 months, and an ink jet after storage at room temperature for 3 months. The properties, white visibility and adhesion to black coated paper were all very good.

On the other hand, when the ink composition of the comparative example using titanium oxide was stored at room temperature for 3 months, the upper layer of the ink became transparent, and the pigment became a hard sediment which could not be redispersed at the bottom of the container. The ink composition was unsuitable for practical use due to clogging of a filter installed in front of the nozzle at the time of jetting.

In Examples 6 and 7, a colored ink composition for ink-jet recording using other organic pigments together with the organic white pigment of the present invention will be described.

Embodiment 6

Table 8 Components Compounding amount (parts) Organic white pigment (manufactured by Hakkol Chemical Co., Ltd., trade name: Shigenox OWP) Organic red pigment (diketopyrrolopyrrole-based pigment, 15 Ciba Specialty Chemical Co., trade name: Irgazin DPR Red BO) Ammonium salt of rosin-modified maleic resin 10 Ethanol 5 Ethylene glycol 5 Ion-exchanged water 55

The above ingredients were mixed, dispersed for 8 hours using a bead mill, and then filtered and purified with a filter having a pore size of 5 μm to obtain a pink ink composition for ink jet recording.

Embodiment 7

Table 9 Components Compounding amount (parts) Organic white pigment (manufactured by Hakkol Chemical Co., Ltd., trade name: 20 Shigenox OWP) Organic yellow pigment (isoindolinone-based pigment, Chi 10ba Specialty Chemical Co., trade name: Cromophthal Yellow 3RT) Ammonium salt of styrene maleic acid resin 10 Isopropyl alcohol 5 Ethylene glycol 5 Ion exchange water 50

The above ingredients were mixed, dispersed for 8 hours using a bead mill, filtered and purified through a filter having a pore size of 5 μm to obtain a yellow ink composition for ink jet recording.

The ink compositions for ink-jet recording obtained in Examples 6 and 7 were charged by using a charge-modulation type ink-jet printer, by the ejection state of each ink, the state of formation of ink droplet particles, the charged state of ink droplet particles, and the deflection. As a result of the printing test of the ejection characteristics such as the state, the ejection characteristics of both inks immediately after production, the stability over time at room temperature for 3 months, the ejection characteristics of the ink after storage at room temperature for 3 months are good, the ink ejection is stable,
Printing was smooth. The printed image was a high-quality image without color separation due to separation of the organic pigment.

Claims (8)

[Claims] (1) Formula (1) Wherein R ¹ , R ² , R ³ , R ⁴ , R ⁷ , R ⁸ , R ⁹ and R ¹⁰
Each independently represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, provided that R ¹ and R ² , R ³ and R ⁴ , R ⁷ and R ⁸ , and R ⁹ and R ¹⁰ are nitrogen atoms And R ⁵ and R ⁶ each independently represent a hydrogen atom, an alkyl group having 1 to 4 carbon atoms or an alicyclic group, and A represents an alkylene group having 2 to 3 carbon atoms. Is shown. ] A water-based ink composition for ink-jet recording comprising, as an organic white pigment, an alkylenebismelamine derivative having a structure represented by the following formula: 2. The aqueous ink composition for ink jet recording according to claim 1, wherein the average particle size of the alkylenebismelamine derivative is 0.2 to 0.4 μm. 3. The aqueous ink composition for ink-jet recording according to claim 1, wherein the content of the alkylenebismelamine derivative is 15 to 35% by weight based on the total amount of the aqueous ink composition. 4. The aqueous ink composition for ink jet recording according to claim 1, wherein the surface tension is 20 to 50 dyn / cm. 5. The aqueous ink composition for inkjet recording according to claim 1, which has a viscosity of 2 to 7 cps. 6. The aqueous ink composition for ink-jet recording according to claim 1, further comprising an ammonium salt of a water-soluble resin as a pigment dispersing resin. 7. The ammonium of at least one resin selected from the group consisting of a styrene acrylic resin, a styrene maleic resin, a maleic acid-modified styrene acrylic resin, a maleated alkyd resin, and a rosin-modified maleic resin. The aqueous ink composition for inkjet recording according to claim 6, which is a salt. 8. The weight ratio (a: b) of the organic white pigment (a) to the pigment dispersing resin (b) is 100: 25 to 1
The aqueous ink composition for inkjet recording according to claim 6, wherein the ratio is 00:50.