WO2014122945A1 - Ink composition, ink set, ink jet recording method, and colored item - Google Patents

Abstract

Provided are a yellow ink composition having excellent water resistance of images recorded on various recording materials while maintaining performance equal to or greater than that of conventional compositions in terms of light resistance and chromogenicity, an ink set using this ink composition as a yellow ink composition, an ink jet recording method using this ink composition or ink set, and a colored item obtained by this ink composition or ink set. This ink composition for ink jet recording contains at least two types of first and second colorant, water-soluble organic solvent, and water; the first colorant is C.I. pigment yellow 213 or 120, and the second colorant is one or more pigments selected from the group consisting of C.I. pigment yellow 74 and 151.

Description

Ink composition, ink set, ink jet recording method, and colored body

The present invention relates to an ink composition used for an ink jet recording method, an ink set provided with the ink composition, an ink jet recording method, and a colored body.

Two types of colorants, dyes and pigments, are generally known as colorants used in inkjet inks. Among these, a recorded image using a dye as a colorant is excellent in image quality such as sharpness, and a recorded image using a pigment as a colorant is excellent in various fastness properties to light, ozone, water, and the like. Has been. From these various advantages of excellent fastness, the use of ink-jet ink (pigment ink for ink-jet) containing a pigment as a colorant is spreading.

With the use of pigment ink, the recorded image is required to improve image quality more than ever, and one of them is improved water resistance. Until now, the water resistance of recorded images obtained with pigments was generally considered excellent. However, as the type of recording material on which an image is formed has been expanded, it has been found that depending on the type of recording material, good water resistance is not always exhibited, and for example, “bleeding” occurs in the image due to contact with water. Since image bleeding is observed as a significant deterioration in image quality, there is a strong demand for the development of pigments (particularly yellow pigments) that can form images without bleeding, and ink-jet inks containing them.

When forming a color image by an ink jet recording method, it is common to use at least three colors of ink, cyan ink, magenta ink, and yellow ink, as an ink set.
In general, cyan pigments and magenta pigments are known to be excellent in both color developability and light fastness, but yellow pigments having such properties are not well known. Conventionally, yellow pigments include C.I. I. Pigment Yellow 74 is widely used. However, although this pigment is excellent in color developability, it is said to have low light resistance.

From the above situation, many proposals have been made regarding yellow pigments that give recorded images with excellent color development and light fastness. Examples of such include Patent Documents 1 to 5 and the like.

JP 2008-266568 A JP 2008-291103 A JP 2009-173853 A JP 2010-248287 A JP 2012-188866 A

The present invention relates to a yellow ink composition excellent in water resistance of images recorded on various recording materials while maintaining performance equal to or better than conventional ones in light resistance and color development, and the ink composition It is an object of the present invention to provide an ink set using a yellow ink composition, an ink jet recording method using the ink composition or ink set, and a colored body obtained by using the ink composition or ink set.

As a result of intensive studies to solve the above-mentioned problems, the present inventors have found that the ink composition for ink jet recording contains at least two specific first and second colorants, a water-soluble organic solvent, and water. Thus, the inventors have found that the above problems can be solved and completed the present invention. That is, the present invention relates to the following [1] to [18].

[1]
An ink composition for ink jet recording containing at least the first and second colorants, a water-soluble organic solvent, and water,
The first colorant is C.I. I. Pigment Yellow 213 or 120, and the second colorant is C.I. I. An ink composition for inkjet recording, which is one or more pigments selected from the group consisting of CI Pigment Yellow 74 and 151.
[2]
The ink composition for ink jet recording according to the above [1], wherein the total content of the colorant is 0.5 to 7% by mass.
[3]
The ink composition for ink jet recording according to the above [1] or [2], wherein the content of the first colorant in the total mass of the colorant is 20 to 80% by mass.
[4]
The ink composition for ink jet recording according to any one of [1] to [3], wherein the content of the first colorant in the total mass of the colorant is 40 to 60% by mass.
[5]
The ink composition for ink jet recording according to any one of [1] to [4], wherein the water-soluble organic solvent is at least one water-soluble organic solvent selected from the group consisting of glycol ethers and alkanediols. object.
[6]
The inkjet recording ink according to [5], wherein the glycol ether is at least one selected from the group consisting of ethylene glycol monoallyl ether, ethylene glycol monoisopropyl ether, diethylene glycol monomethyl ether, and propylene glycol monopropyl ether. Composition.
[7]
The alkanediol is 1,2-pentanediol, 1,2-hexanediol, 2-methyl-2,4-pentanediol, 2-ethyl-1,3-hexanediol, and 2,4-diethyl-1, The ink composition for ink jet recording according to the above [5] or [6], which is at least one selected from the group consisting of 5-pentanediol.
[8]
An ink set for inkjet recording comprising at least each of the ink compositions of a yellow ink composition, a cyan ink composition, a magenta ink composition, and a black ink composition,
An ink set for ink jet recording using the ink composition for ink jet recording according to any one of [1] to [7] as the yellow ink composition.
[9]
Recording is performed by using the ink composition for ink jet recording according to any one of the above [1] to [7] as an ink, and ejecting ink droplets according to a recording signal to adhere to the recording material. An ink jet recording method.
[10]
Using each ink composition of the ink set for ink jet recording described in [8] above as an ink, droplets of each ink of the ink set are ejected according to respective recording signals and adhered to the recording material. An ink jet recording method for recording by the above method.
[11]
The inkjet recording method according to [9] or [10], wherein the recording material is an information transmission sheet.
[12]
The inkjet recording method according to [11], wherein the information transmission sheet is a sheet having an ink receiving layer containing a porous white inorganic substance.
[13]
The inkjet recording method according to [11], wherein the information transmission sheet is cast-coated paper.
[14]
The inkjet recording method according to [11], wherein the information transmission sheet is coated paper or art paper.
[15]
The inkjet recording method according to [13] or [14], wherein the information transmission sheet is a sheet that has been subjected to at least one surface modification treatment selected from corona discharge treatment, plasma treatment, and frame treatment. .
[16]
A colored body colored with the ink composition for inkjet recording according to any one of [1] to [7].
[17]
A colored body colored with the ink set for ink jet recording described in [8] above.
[18]
An ink jet printer loaded with a container containing at least the ink composition for ink jet recording according to any one of [1] to [7].

According to the present invention, a yellow ink composition excellent in water resistance of images recorded on various recording materials while maintaining performance equal to or better than conventional ones in light resistance and color developability, and the ink composition Can be provided as a yellow ink composition, an ink jet recording method using the ink composition or the ink set, and a colored product obtained by the ink composition or the ink set.

Hereinafter, the present invention will be described in detail.
In this specification, “CI” is an abbreviation for color index. Further, in the present specification, “%” and “part” numbers are described on a mass basis unless otherwise specified.

The first colorant contained in the ink composition is C.I. I. Pigment yellow 213 or 120, and the former is preferable.
The second colorant is C.I. I. One or more pigments selected from the group consisting of CI Pigment Yellow 74 and 151. Both of the second colorants may be blended, but each is preferably used alone, and more preferably the former is used alone.

The total content of the colorant contained in the ink composition is usually 0.5 to 7%, preferably 1 to 7%, more preferably 2 to 7%, and further preferably 3 to 7%.
When it is 0.5% or more, the color density of the recorded image is good, and when it is 7% or less, the discharge property is good.

The content of the first colorant in the total mass of the colorant contained in the ink composition is usually 10 to 90%, preferably 20 to 80%, more preferably 25 to 75%, and further It is preferably 30 to 70%, particularly preferably 40 to 60%. By setting it as this range, it becomes easy to improve water resistance, maintaining light resistance and coloring property.

The content of the second colorant in the total mass of the colorant contained in the ink composition is usually 10 to 90%, preferably 20 to 80%, more preferably 25 to 75%, and further It is preferably 30 to 70%, particularly preferably 40 to 60%. By setting it as this range, it becomes easy to improve water resistance, maintaining light resistance and coloring property.

Specific examples of the water-soluble organic solvent contained in the ink composition include, for example, C1-C6 alkanols such as methanol, ethanol, propanol, isopropanol, butanol, isobutanol, sec-butanol, and tert-butanol; N, N— Carboxylic acid amides such as dimethylformamide and N, N-dimethylacetamide; Lactams such as 2-pyrrolidone, N-methyl-2-pyrrolidone and N-methylpyrrolidin-2-one; 1,3-dimethylimidazolidin-2-one Cyclic ureas such as 1,3-dimethylhexahydropyrimido-2-one; ketones or ketoalcohols such as acetone, 2-methyl-2-hydroxypentan-4-one, ethylene carbonate; tetrahydrofuran, dioxane, etc. Cyclic ether; ethylene glycol, diethylene Recall, 1,2-propylene glycol, 1,3-propylene glycol, 1,2-butylene glycol, 1,4-butylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, dipropylene glycol, polyethylene glycol (preferably molecular weight 400, 800, 1540 or more), mono-, oligo-, or polyalkylene glycols or thioglycols having C2-C6 alkylene units such as polypropylene glycol, thiodiglycol, dithiodiglycol, etc .; glycerin, diglycerin, hexane -C3-C9 polyols (triols) such as 1,2,6-triol and trimethylolpropane; ethylene glycol monomethyl ether, ethylene glycol monoethyl ether Ter, ethylene glycol monoallyl ether, ethylene glycol monoisopropyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether (butyl carbitol), triethylene glycol monomethyl ether, triethylene glycol monoethyl ether, triethylene glycol monobutyl ether Glycol ethers such as propylene glycol monopropyl ether, prolene glycol monobutyl ether, dipropylene glycol monomethyl ether (preferably C3-C10 mono-, di- or triethylene glycol ether and C4-C13 mono-, di- or tri- Glyco selected from the group consisting of propylene glycol ethers 1, 2-pentanediol, 1,5-pentanediol, 1,2-hexanediol, 1,6-hexanediol, 2-methyl-2,4-pentanediol, 2-ethyl-1,3- C5-C9 alkanediols such as hexanediol and 2,4-diethyl-1,5-pentanediol; γ-butyrolactone, dimethylsulfoxide; and the like. These water-soluble organic solvents may be used alone or in combination of two or more.

Among the above, as the water-soluble organic solvent, it is preferable to use at least one water-soluble organic solvent selected from the group consisting of glycol ether and alkanediol.
Among these, the glycol ether is more preferably at least one selected from the group consisting of ethylene glycol monoallyl ether, ethylene glycol monoisopropyl ether, diethylene glycol monomethyl ether, and propylene glycol monopropyl ether.
Examples of the alkanediol include 1,2-pentanediol, 1,2-hexanediol, 2-methyl-2,4-pentanediol, 2-ethyl-1,3-hexanediol, and 2,4-diethyl- More preferably, it is at least one selected from the group consisting of 1,5-pentanediol.

The ink composition preferably further contains a dispersant in order to stabilize the dispersion state of the contained pigment.

Examples of the dispersant include styrene and derivatives thereof; vinyl naphthalene and derivatives thereof; aliphatic alcohol esters of α, β-ethylenically unsaturated carboxylic acids; acrylic acid and derivatives thereof; maleic acid and derivatives thereof; itaconic acid and derivatives thereof; Fumaric acid and derivatives thereof; vinyl acetate, vinyl alcohol, vinyl pyrrolidone, acrylamide, and derivatives thereof; at least two monomers selected from the group consisting of monomers (preferably at least one of which is hydrophilic) A copolymer (a block copolymer, a random copolymer, a graft copolymer), and / or a salt thereof. The above various copolymers and / or salts thereof may be used alone or in combination of two or more.
The weight average molecular weight of the dispersant is about 1000 to 30000, preferably about 1250 to 25000, more preferably about 1500 to 20000. The acid value is about 80 to 300, preferably 90 to 275, more preferably about 100 to 250.
The dispersant can also be obtained as a commercial product, and specific examples thereof include Jonkrill ^TM 61J, 67, 68, 450, 55, 555, 586, 678, 680, 682, all manufactured by BASF. 683, 690, B-36;
In the present specification, the superscript “TM” means a trademark.

The amount of the dispersant used is usually 0.1 to 20%, preferably 0.5 to 16%, based on the total mass of the pigment, as a mass ratio in terms of solid content when preparing the dispersion. Preferably, it is 1 to 14%.

Instead of the combination of the pigment and the dispersant, a so-called surface-treated pigment (self-dispersed pigment) in which a dispersibility-imparting group is chemically introduced directly onto the pigment particle surface can be used. Further, a so-called microcapsule pigment in which a pigment is coated with the above-described dispersant or the like may be used.

The ink composition may contain a penetrant for the purpose of increasing the wettability of the ink composition with respect to the recording medium and enhancing the penetrability.
Examples of the penetrant include various surfactants described later.
The water-soluble organic solvents include those that can be expected to have an effect of adjusting the permeability. Examples of such water-soluble organic solvents include C1-C6 alkanol, glycol ether, and C5-C9 alkanediol. Of these, glycol ether and C5-C9 alkanediol are preferred.

When preparing the dispersion and the ink composition, if foaming is severe due to stirring or the like, an antifoaming agent may be contained.

Examples of the antifoaming agent include silicone-based, silica mineral oil-based, olefin-based, and acetylene-based. Examples of commercially available antifoaming agents include Surfinol ^TM DF37, DF58, DF110D, DF220, MD-20, and Olphin ^TM SK-14, all manufactured by Shin-Etsu Chemical Co., Ltd. These antifoaming agents may be used alone or in combination of two or more.

The addition amount of the antifoaming agent is preferably 0.01 to 5%, more preferably 0.03 to 3%, and further preferably 0.05 to 1%. The effect as an antifoamer becomes favorable by setting it as 0.01% or more, and dispersion stability becomes favorable by setting it as 5% or less.

Although the ink composition may be used alone, it is used as a yellow ink composition for the purpose of obtaining a full-color recorded image, for example, for inkjet recording comprising a cyan ink composition, a magenta ink composition, and a black ink composition. It may be used as an ink set. At this time, the colorant contained in each of the cyan, magenta, and black ink compositions is not particularly limited, and a known pigment can be arbitrarily used. In addition to the four-color ink set, for the purpose of obtaining a recorded image having a higher-definition hue, for example, a violet, orange-brown, green, or other ink composition is optionally added. It is good.

Hereinafter, the pigments contained in the ink compositions of the respective colors other than the ink composition used as the yellow ink composition will be described.
The pigment mainly includes inorganic pigments, organic pigments, extender pigments, etc., and any pigment can be used. These pigments can also be combined. For example, an organic pigment and an extender pigment may be blended.

Specific examples of organic pigments contained in the ink compositions of cyan, magenta, black, violet, orange to brown, and green include C.I. I. Pigment Blue 1, 2, 3, 15, 15: 1, 15: 2, 15: 3, 15: 4, 15: 6, 16, 22, 25, 60, 66, 80, etc. cyan (blue) pigments C. I. Pigment Red 5, 7, 12, 48, 48: 1, 57, 88, 112, 122, 123, 146, 149, 166, 168, 177, 178, 179, 184, 185, 202, 206, 207, 254, Magenta (red) pigments such as 255, 257, 260, 264, 272; I. Pigment Black 1 and other black pigments; C.I. I. Pigment Violet 19, 23, 29, 37, 38, 50 and the like violet pigments; C.I. I. Pigment Orange 13, 16, 68, 69, 71, 73, etc. Orange to brown pigments; C.I. I. Pigment Green 7, 36, 54, etc. Green pigments;

Examples of inorganic pigments include carbon black, metal oxide, metal hydroxide, metal sulfide, metal ferrocyanide, and metal chloride. In particular, carbon black is preferred as the pigment contained in the black ink composition. Examples of carbon black include thermal black and acetylene black obtained by a pyrolysis method; oil furnace black, gas furnace black, lamp black, gas black, and channel black obtained by an incomplete combustion method. One kind of these carbon blacks may be used, or a plurality of carbon blacks may be used in combination. Of these, gas furnace black, lamp black, acetylene black, and channel black are preferable.

The carbon black is easily available as a commercial product. Specific examples thereof, Raven760ULTRA, Raven780ULTRA, Raven790ULTRA, Raven1060ULTRA, Raven1080ULTRA, Raven1170, Raven1190ULTRA II, Raven1200, Raven1250, Raven1255, Raven1500, Raven2000, Raven2500ULTRA, Raven3500, Raven5000ULTRA II, Raven5250, Raven5750, Raven7000 (Columbia Carbon Co. Manufactured); Monarch 700, Monarch 800, Monarch 880, Monarch 900, Monarch 1000, Monarch 1100, Monarch 1300, Mo arch1400, Regal1330R, Regal1400R, Regal1660R, Mogul L (manufactured by Cabot Corporation); Color Black FW1, Color Black FW2, Color Black FW18, Color Black FW200, Color5PrP , SpecIal Black 4, SpecIal Black 4A, SpecIal Black 5, Special Black 6, Nerox 305, Nerox 505, Nerox 510, Nerox 605, Nerox engineer car 600 Made Inc.); MA7, MA8, MA100, MA600, MCF-88, No. 25, no. 33, no. 40, no. 47, no. 52, no. 900, no. 2300 (manufactured by Mitsubishi Chemical Corporation);

Examples of organic pigments include soluble azo pigments, insoluble azo pigments, insoluble diazo pigments, condensed azo pigments, phthalocyanine pigments, quinacridone pigments, isoindolinone pigments, dioxazine pigments, perylene pigments, perinone pigments, thioindigo pigments, anthraquinone pigments, quinophthalone. And pigments. One kind of these organic pigments may be used, or a plurality of organic pigments may be used in combination. In addition, the above inorganic pigments can also be used, and extender pigments and the like can also be used for improving fluidity.

Examples of extender pigments include silica, calcium carbonate, talc, clay, barium sulfate, and white carbon. These extender pigments are not used alone and are usually used in combination with an inorganic pigment or an organic pigment.

Each of the above pigments may be used alone, or two or more of an inorganic pigment and / or an organic pigment may be used in combination for adjusting the hue of the image. The main purpose of the hue adjustment here is to darken the recorded image; to widen the color gamut; In addition, when a plurality of pigments are used in combination, the storage stability of the ink composition as the dispersion may be improved, and this may be aimed at.

The pigment content in the total mass of the cyan, magenta, and black ink compositions is usually 1 to 30%, preferably 1 to 10%, more preferably 2 to 7%.

Unless otherwise specified, matters common to all ink compositions including the ink compositions of the respective colors constituting the ink set are described below.
The pH of the ink composition is preferably pH 5 to 11 and more preferably pH 7 to 10 for the purpose of improving storage stability.
Similarly, the surface tension of the ink composition is preferably 10 to 50 mN / m, more preferably 20 to 40 mN / m.
Similarly, the viscosity of the ink composition is preferably 30 mPa · s or less, and more preferably 20 mPa · s or less.

When the ink composition is used for ink jet recording, the content of inorganic impurities such as metal cation chloride (for example, sodium chloride); sulfate (for example, sodium sulfate) in the ink composition is small. preferable. Inorganic impurities are often mixed in the pigment bulk powder that is a colorant, and it is also preferable to purify the pigment bulk powder as necessary. As a standard of the content of inorganic impurities, it is about 1% or less with respect to the total mass of the pigment, and the lower limit may be below the detection limit of the analytical instrument, that is, 0%. As a method for removing inorganic impurities from the pigment, for example, a dried pigment product or a wet cake is prepared by using a suitable water-soluble organic solvent (for example, C1-C4 alcohol such as methanol), and if necessary, a water-soluble organic solvent and water. And desalting by a method of filtering and separating the precipitate and drying; a method of exchanging and adsorbing inorganic impurities with an ion exchange resin; and the like.

Examples of the ink preparation agent used as appropriate in the preparation of the ink composition include antiseptic / antifungal agents, pH adjusters, chelating reagents, rust inhibitors, water-soluble ultraviolet absorbers, water-soluble polymer compounds, antioxidants, Surfactant, water dispersible resin, etc. are mentioned.

Specific examples of the antifungal agent include sodium dehydroacetate, sodium benzoate, sodium pyridinethione-1-oxide, ethyl p-hydroxybenzoate, 1,2-benzisothiazolin-3-one and salts thereof. .

Specific examples of the preservative include, for example, organic sulfur, organic nitrogen sulfur, organic halogen, haloaryl sulfone, iodopropargyl, haloalkylthio, nitrile, pyridine, 8-oxyquinoline, benzo Thiazole, isothiazoline, dithiol, pyridine oxide, nitropropane, organotin, phenol, quaternary ammonium salt, triazine, thiazine, anilide, adamantane, dithiocarbamate, brominated indanone , Benzyl bromacetate compounds, inorganic salt compounds and the like. Specific examples of organic halogen compounds include sodium pentachlorophenol, and specific examples of pyridine oxide compounds include, for example, sodium 2-pyridinethiol-1-oxide. Specific examples of isothiazoline compounds Are, for example, 1,2-benzisothiazolin-3-one, 2-n-octyl-4-isothiazolin-3-one, 5-chloro-2-methyl-4-isothiazolin-3-one, 5-chloro-2 -Methyl-4-isothiazolin-3-one magnesium chloride, 5-chloro-2-methyl-4-isothiazolin-3-one calcium chloride, 2-methyl-4-isothiazolin-3-one calcium chloride and the like. Specific examples of the other antiseptic / antifungal agents include anhydrous sodium acetate, sodium sorbate, sodium benzoate, trade name, Proxel ^TM GXL (S), Proxel ^TM XL-2 (S), and the like.

As the pH adjuster, any substance can be used as long as it can control the pH of the ink within a predetermined range without adversely affecting the prepared ink. Specific examples thereof include, for example, alkanolamines such as diethanolamine, triethanolamine and N-methyldiethanolamine; hydroxides of alkali metals such as lithium hydroxide, sodium hydroxide and potassium hydroxide; ammonium hydroxide (ammonia water) Alkaline metal carbonates such as lithium carbonate, sodium carbonate, sodium hydrogen carbonate and potassium carbonate; alkali metal salts of organic acids such as sodium silicate and potassium acetate; inorganic bases such as disodium phosphate;

Specific examples of the chelating reagent include, for example, disodium ethylenediaminetetraacetate, sodium nitrilotriacetate, sodium hydroxyethylethylenediaminetriacetate, sodium diethylenetriaminepentaacetate, sodium uracil diacetate and the like.

Specific examples of the rust preventive include, for example, acidic sulfite, sodium thiosulfate, ammonium thioglycolate, diisopropylammonium nitrite, pentaerythritol tetranitrate, dicyclohexylammonium nitrite and the like.

Specific examples of the water-soluble ultraviolet absorber include sulfonated benzophenone compounds, benzotriazole compounds, salicylic acid compounds, cinnamic acid compounds, and triazine compounds.

Specific examples of the water-soluble polymer compound include polyethylene glycol, polyvinyl alcohol, cellulose derivatives, polyamine, polyimine, and the like.

The water-dispersible resin has a function of fixing the colorant in the ink composition to the recording material by forming a film at room temperature. The resin used for the water dispersible resin is not particularly limited, and examples thereof include urethane resins, polyester resins, acrylic resins, vinyl acetate resins, vinyl chloride resins, acrylic styrene resins, acrylic silicone resins, and the like. Can be mentioned.
The water-dispersible resin is used, for example, in the state of a resin emulsion dispersed in water as a continuous phase.
Some resin emulsions are commercially available. Specific examples thereof include, for example, Superflex ^™ 126, 150, 170, 210, 420, 470, 820, 830, 890 (urethane resin emulsion, manufactured by Daiichi Kogyo Seiyaku); Hydran ^™ HW-350, HW- 178, HW-163, HW-171, AP-20, AP-30, WLS-201, WLS-210 (urethane resin emulsion, manufactured by DIC); 0569, 0850Z, 2108 (styrene-butadiene resin emulsion, JSR) AE980, AE981A, AE982, AE986B, AE104 (acrylic resin emulsion, manufactured by Etec);
When the water-dispersible resin is used, the content of the water-dispersible resin in the total mass of the ink composition is usually 0.5 to 20%, preferably 1 to 15% in terms of solid content. By setting it to 0.5% or more, it becomes easy to obtain sufficient fixability to the recording material, and by setting it to 20% or less, there is no possibility of hindering normal ejection of ink droplets in ink jet recording. .

As specific examples of the antioxidant, for example, various organic and metal complex anti-fading agents can be used. Specific examples of organic anti-fading agents include hydroquinones, alkoxyphenols, dialkoxyphenols, phenols, anilines, amines, indanes, chromans, alkoxyanilines, heterocycles, and the like. .

Specific examples of the surfactant include known surfactants such as an anionic surfactant, a cationic surfactant, a nonionic surfactant, an amphoteric surfactant, a silicone surfactant, and a fluorine surfactant. Is mentioned.

Anionic surfactants include alkyl sulfocarboxylates, α-olefin sulfonates, polyoxyethylene alkyl ether acetates, polyoxyethylene alkyl ether sulfates, N-acyl amino acids or salts thereof, N-acyl methyl taurate salts , Alkyl sulfate polyoxyalkyl ether sulfate, alkyl sulfate polyoxyethylene alkyl ether phosphate, rosin acid soap, castor oil sulfate ester, lauryl alcohol sulfate ester, alkylphenol type phosphate ester, alkyl type phosphate ester, alkylaryl Examples of those that can be obtained as commercially available products include sulfonates, diethylsulfosuccinates, diethylhexylsulfosuccinates, dioctylsulfosuccinates, and the like. Nord ^{TM LA-10, LA-12} , LA-16, neo HITENOL ^TM ECL-30S, ECL-45 and the like.

Examples of the cationic surfactant include 2-vinylpyridine derivatives and poly-4-vinylpyridine derivatives.

Nonionic surfactants include ethers such as polyoxyethylene nonylphenyl ether, polyoxyethylene octylphenyl ether, polyoxyethylene dodecylphenyl ether, polyoxyethylene oleyl ether, polyoxyethylene lauryl ether, polyoxyethylene alkyl ether; Ester systems such as polyoxyethylene oleate, polyoxyethylene distearate, sorbitan laurate, sorbitan monostearate, sorbitan monooleate, sorbitan sesquioleate, polyoxyethylene monooleate, polyoxyethylene stearate; 2,4,7,9-tetramethyl-5-decyne-4,7-diol, 3,6-dimethyl-4-octyne-3,6-diol, 3,5-dimethyl -1-hexyne-3-acetylene glycol (alcohol) -based ol; both manufactured by Nissin Chemical Industry Co., Ltd. Surfynol ^TM 104,104PG50,105PG50,82,420,440,465,485; Olfine ^TM STG; poly glycol ether (e.g. SIGMA-ALDRICH Corp. TergItol ^TM 15-S-7 and the like); and the like.

Amphoteric surfactants include lauryldimethylaminoacetic acid betaine, 2-alkyl-N-carboxymethyl-N-hydroxyethylimidazolinium betaine, coconut oil fatty acid amidopropyldimethylaminoacetic acid betaine, polyoctylpolyaminoethylglycine, imidazoline derivatives, etc. Is mentioned.

Examples of silicone surfactants include polyether-modified siloxane and polyether-modified polydimethylsiloxane. Specific examples of commercially available products include BYK-347 (polyether-modified siloxane); BYK-345 and BYK-348 (polyether-modified polydimethylsiloxane), all manufactured by BYK Chemie. .

Examples of the fluorosurfactant include a perfluoroalkyl sulfonic acid compound, a perfluoroalkyl carboxylic acid compound, a perfluoroalkyl phosphate ester compound, a perfluoroalkyl ethylene oxide adduct, and a perfluoroalkyl ether group as a side chain. And polyoxyalkylene ether polymer compounds. Specific examples of commercially available products include, for example, Zonyl TBS, FSP, FSA, FSN-100, FSN, FSO-100, FSO, FS-300, Capstone FS-30, FS-31 (manufactured by DuPont); PF-151N, PF-154N (Omnova);

Of the above, anionic, nonionic, silicone-based, and fluorine-based surfactants are preferred. These surfactants may be used alone or in combination of two or more.
When the ink composition contains a surfactant, the total content of the surfactant is usually 0.1% to 3%, preferably 0.3% to 1% with respect to the total mass of the ink composition. is there. When the content is 0.1% or more, the effect as a surfactant is good, and when the content is 3% or less, the dispersion stability of the pigment is good.

Examples of methods for preparing the ink composition include known methods such as stirring and mixing the above pigments using a sand mill (bead mill), roll mill, ball mill, paint shaker, ultrasonic disperser, microfluidizer, etc. A water-based dispersion liquid prepared by using a water-soluble organic solvent, water and, if necessary, an ink preparation agent and the like may be added and mixed by a known method using stirring, a homogenizer, or the like. The order in which the components of the ink composition are mixed is not particularly limited.

When the ink composition is used for ink jet recording, it is preferable to remove solid impurities other than components necessary for the ink composition, for example, by filtration and separation. A known method can be appropriately used as the filtration separation method. For example, there is a method of suction filtration using filter paper such as glass filter paper GC-50 (retained particle diameter 0.5 μm, manufactured by Advantech), glass filter paper GA-100 (retained particle diameter 1.0 μm, manufactured by Advantech), and the like. . These glass filter papers may be used alone. In addition, two or more filter papers may be used in piles for the purpose of increasing the efficiency of filtration.

The ink composition can be used in various recordings. For example, it is suitable for writing instruments, aqueous printing, information recording, textile printing, etc., and particularly preferably used for ink jet recording.

In the ink jet recording method, recording is performed by using the ink composition or each ink composition of the ink set as ink, and ejecting droplets of the ink in accordance with a recording signal to adhere to the recording material. Is the method. The ink nozzles used for recording are not particularly limited and can be appropriately selected according to the purpose.

The recording method may be any known method, for example, a charge control method for ejecting ink using electrostatic attraction; a drop-on-demand method (pressure pulse method) using vibration pressure of a piezo element ); Acoustic ink jet system that converts electrical signal into acoustic beam and irradiates ink using its radiation pressure; ejects ink using its radiation pressure; thermal ink jet that heats ink to form bubbles and uses generated pressure, ie bubble Jet (registered trademark) system;
In the above ink jet recording method, a method called a photo ink, in which a large number of inks having a low colorant concentration (colorant content) in the ink are ejected in a small volume; Examples include a method of improving image quality using a plurality of inks having different colorant concentrations; a method of improving the fixability of a colorant by using a colorless and transparent ink; and the like.

The colored body means a material colored by the ink composition or an ink set containing the ink composition, and preferably includes a recording material colored by an ink jet recording method using an ink jet printer. The recording material is not particularly limited, and examples thereof include information transmission sheets such as paper and film, fibers and cloth (cellulose, nylon, wool, etc.), leather, and color filter base materials. Among these, an information transmission sheet is preferable.
Information transmission sheets can be broadly classified into those having an ink receiving layer and those having no ink receiving layer.
As what has an ink receiving layer, the thing which used paper, a synthetic paper, a film, etc. as a base material and provided the ink receiving layer in these is mentioned, for example. The ink receiving layer is formed by, for example, impregnating or coating the base material with a cationic polymer; inorganic fine particles capable of absorbing pigments in inks such as porous silica, alumina sol, and special ceramics, such as polyvinyl alcohol and polyvinyl pyrrolidone. A method of coating the surface of the substrate together with the hydrophilic polymer;
An information transmission sheet having an ink-receiving layer is usually called inkjet paper, inkjet film, glossy paper, or the like. Typical examples of commercially available products are manufactured by Canon Inc. Product name: Professional Photo Paper, Super Photo Paper, Glossy Gold and Matt Photo Paper; Seiko Epson Corporation Product Name: Photo Paper Crispia (High Gloss) Photographic paper (gloss), photo matte paper; manufactured by Nippon Hewlett-Packard Co., Ltd., trade name: advanced photo paper (gloss); manufactured by Fuji Film Co., Ltd., trade name: painting finish photo Pro;

Examples of the information transmission sheet that does not have an ink receiving layer include various types of paper such as gravure printing and offset printing, various types of paper such as art paper, and cast coated paper used for label printing. .

When an information transmission sheet having no ink receiving layer is used as a recording material, it is also preferable to subject the recording material to a surface modification treatment for the purpose of improving the fixing property of the colorant.

As the surface modification treatment, it is preferable to perform at least one treatment selected from a corona discharge treatment, a plasma treatment, and a flame treatment. For these processes, any known method may be used. In addition, it is generally known that the effects of these treatments decrease with time. For this reason, when surface modification processing is performed on the information transmission sheet, it is preferable to continuously perform ink jet recording without taking time.

As the corona discharge treatment, there is a method of generating a corona discharge by applying a high voltage of several thousand volts between a grounded metal roll and a wire-like electrode placed at intervals of several mm. . By disposing and processing the information transmission sheet between the electrode and the roll during the corona discharge, the surface of the sheet is hydrophilized.

In the plasma treatment, an information transmission sheet is placed in a container containing argon, neon, helium, nitrogen, nitrogen dioxide, oxygen, air, etc., and exposed to plasma generated by glow discharge, whereby oxygen, nitrogen is applied to the surface of the sheet. And a method of introducing a functional group containing, and the like. When an inert gas such as argon or neon is present at a low pressure, it is considered that radicals are generated on the surface of the sheet by the generated plasma. Then, it is considered that the radical is combined with oxygen by being exposed to air, and a carboxylic acid group, a carbonyl group, an amino group, or the like is introduced into the surface of the information transmission sheet.

The flame treatment is also referred to as flame treatment. For example, there is a method of improving hydrophilicity by spraying a gas oxidation flame or the like sprayed from a burner or the like on the surface of the information transmission sheet to oxidize the surface of the sheet.

The surface modification treatment can be performed by appropriately adjusting the number of treatments; treatment time; applied voltage; etc. so as to obtain a desired effect.

When recording on a recording material by the ink jet recording method, a container containing at least the ink composition used as a yellow ink composition is loaded in a predetermined position of the ink jet printer, and the recording material is recorded by the above recording method. Record it.
Further, when performing ink jet recording using the ink set, each container containing the ink composition of each color may be loaded in a predetermined position of the ink jet printer and recorded on the recording material by the above recording method. .

According to the present invention, it is possible to provide an ink-jet yellow ink that comprehensively improves various fastnesses such as light resistance, water resistance, and oil resistance, color developability, and storage stability. In addition, the ink set, ink jet recording method, and colored body using the ink composition of the present invention as a yellow ink composition are excellent in fading balance with other color ink compositions other than the yellow ink composition, and are due to secular change. Image deterioration can be improved.

EXAMPLES Hereinafter, although an Example demonstrates this invention further more concretely, this invention is not limited at all by the following example.
Unless otherwise specified, when filtration / separation was performed, suction filtration was performed using glass filter paper GC-50 and glass filter paper GA-100 as filter paper, either alone or in combination as appropriate.
When measuring the content of the colorant in the total mass of the dispersion, it was determined by dry weight method using MS-70 manufactured by A & D Corporation.
For measurement of the average particle size, LB-500 (manufactured by Horiba, Ltd.) was used.
For measuring the viscosity, a RE215L viscometer (manufactured by Toki Sangyo Co., Ltd.) was used.

(A) Preparation of aqueous dispersant solution [Preparation Example 1]
Joncrill 68 (25 parts), triethanolamine (13.3 parts), and ion-exchanged water (61.7 parts) were added to a three-necked flask equipped with a condenser, and the temperature was raised to 90 ° C. while stirring at 150 rpm. An aqueous solution containing 25% of Joncryl 68 was obtained by heating.
“Johncrill 68” in the following Table 1 means an aqueous solution containing 25% of Johncrill 68.

(B) Preparation of aqueous dispersion [Preparation Example 2]
As the first colorant, C.I. I. Each component described in Table 1 below was mixed using Pigment Yellow 213 (Inkjet Yellow H5G11 manufactured by Clariant), and dispersion treatment was performed for 15 hours using a sand grinder at 1500 rpm. The obtained liquid was diluted with ion exchange water, and the dispersion beads were separated by filtration to prepare a yellow dispersion liquid. This dispersion is referred to as “Dispersion 1”.
The content of the colorant in the total mass of the dispersion 1 was 12%. Further, the pH of the dispersion 1 was 7.7, the average particle diameter of the colorant was 77 nm, and the viscosity was 5.4 mPa · s.
In Tables 1 and 2 below, the numerical values indicating the amounts of the components are all “parts”, and “-” indicates that the component is not included. In addition, “water” used ion-exchanged water. Further, “Olfin SK-14” is an antifoaming agent and is removed by filtration, so it is not contained in the ink compositions of the examples and comparative examples.

[Preparation Example 3]
C. used in Preparation Example 2 I. Instead of CI Pigment Yellow 213, C.I. I. A yellow dispersion was obtained in the same manner as in Preparation Example 2 except that CI Pigment Yellow 74 (HANSA Yellow 5GX01 manufactured by Clariant) was used. This dispersion is referred to as “Dispersion 2”.
The content of the colorant in the total mass of the dispersion 2 was 19%. Further, the pH of the dispersion 2 was 7.4, the average particle diameter of the colorant was 48 nm, and the viscosity was 3.4 mPa · s.

(C) Preparation of ink [Examples 1 to 3]
Using the dispersions 1 and 2 obtained in Preparation Examples 2 and 3 above, mixing the components shown in Table 2 below, and then filtering out impurities with a 3 μm membrane filter, the ink composition of each Example I got a thing. All ink compositions were adjusted so that the total content of the colorant was 5%.

[Comparative Examples 1 and 2]
In the same manner as in Examples 1 to 3, each component shown in Table 2 below was mixed, and then impurities were separated by filtration with a membrane filter to obtain ink compositions of each comparative example. These ink compositions were also adjusted so that the total colorant content was 5%.

Abbreviations in Table 2 below have the following meanings.
IPG: isopropyl glycol (ethylene glycol monoisopropyl ether)
LA-16: Haitenol LA-16
1,2-HD: 1,2-hexanediol TEA: Triethanolamine GXL (S): Proxel GXL (S)
PY213: C.I. I. Pigment Yellow 213
PY74: C.I. I. Pigment Yellow 74
Water: Ion exchange water

(D) Water resistance test Ink jet recording was performed on the following four types of recording materials using a commercially available ink jet printer (PX-101 manufactured by Epson Corporation) using the ink compositions of Examples and Comparative Examples as inks. . During inkjet recording, a check pattern (a pattern in which 1.5 mm squares having a density of 100% and 0% were alternately combined) was created to obtain a yellow / white colored body with high contrast. The white portion is a portion of the paper background that is not colored with ink. The obtained colored body was used as a test piece. Immediately after ink jet recording, 0.2 ml of ion-exchanged water was dropped on the recorded image portion, and ink bleeding was visually evaluated according to the following four evaluation criteria. The results are shown in Table 3 below.
[Evaluation criteria]
A: No bleeding is observed B: Slight bleeding is observed C: Obvious bleeding is observed D: Vigorous bleeding is recognized as the check pattern is broken [Recorded material]
Cast coated paper: Oji Paper Co., Ltd. N mirror gloss paper: Oji Paper Co., Ltd. foam gloss plain paper 1: Nippon Paper Industries Co., Ltd. Npi55
Plain paper 2: Mitsubishi Paper Industries PD-W70

In each of the examples and comparative examples, the plain paper showed extremely good water resistance, while the cast coated paper and the gloss paper showed a great difference. In contrast to each of the comparative examples containing the first and second colorants independently, in each of the examples containing both, the water resistance improvement effect was observed synergistically. This synergistic effect was observed when the content ratio of the first and second colorants was approximately 80:20, clearly observed at 70:30 and prominently observed at 60:40.

(E) Light resistance test The ink compositions of each Example and Comparative Example were used in the above-mentioned "(D) Water resistance test" using a commercially available inkjet printer (PX-101 manufactured by Epson Corporation). A yellow colored product was obtained by solid printing on the recording material. The obtained colored product was used as a test piece, and exposed to light at a temperature of 24 ° C., a humidity of 60%, and an illuminance of 100 kLux for 2 weeks using a light resistance tester (Xenon Weather Meter manufactured by Suga Test Instruments Co., Ltd.). The color was measured using (SpectroEye manufactured by X-Rite), and the remaining ratio of the colorant was evaluated according to the following three evaluation criteria. The results are shown in Table 4 below.
[Evaluation criteria]
A: Residual rate 70% or more B: Residual rate 50% or more and less than 70% C: Residual rate less than 50%

Also in the light resistance test, each example containing both the first and second colorants has a synergistic effect in gloss paper, and each comparative example contains the first and second colorants independently. It showed extremely good light resistance equivalent to or better than.

(F) Evaluation of color development The ink compositions of the above Examples and Comparative Examples were each used in the above “(D) Water resistance test” using a commercially available inkjet printer (PX-101 manufactured by Epson Corporation). A yellow colored body was obtained by solid printing on four types of recording materials. The obtained colored product was used as a test piece, and the color developability (print density) was evaluated by a colorimeter (SpectroEye manufactured by X-Rite) according to the following three evaluation criteria. The results are shown in Table 5.
[Evaluation criteria]
A: 1.2 or more B: 0.9 or more and less than 1.2 C: Less than 0.9

Each example also showed good results with respect to color developability.

(G) Preparation of aqueous dispersion [Preparation Example 4]
A block copolymer described in Synthesis Example 3 of International Publication No. 2013/115071 was prepared, and the obtained polymer dispersant was dissolved in 9 parts and 20 parts of 2-butanone to obtain a uniform solution. To this was added a solution prepared by dissolving 0.68 parts of sodium hydroxide in 49.6 parts of ion exchange water, and stirred for 1 hour to prepare an emulsified solution in which the polymer dispersant was dissolved. At this time, no crystals were precipitated. As the first colorant, C.I. I. 20 parts of Pigment Yellow 213 (Inkjet Yellow H5G11 manufactured by Clariant) was mixed and dispersed with a sand grinder at 1500 rpm for 15 hours. To the obtained liquid, 100 parts of ion-exchanged water was dropped, and the dispersing beads were separated by filtration. Then, 2-butanone and water were distilled off under reduced pressure using an evaporator to prepare a yellow dispersion liquid. This dispersion is designated as “Dispersion 3”.
The content of the colorant in the total mass of the dispersion 3 was 12%. The pH of dispersion 3 was 8.9, the average particle diameter of the colorant was 114 nm, and the viscosity was 8.0 mPa · s.

[Preparation Example 5]
C. used in Preparation Example 4 I. Instead of CI Pigment Yellow 213, C.I. I. A yellow dispersion liquid was obtained in the same manner as in Preparation Example 4 except that CI Pigment Yellow 74 (HANSA Yellow 5GX01 manufactured by Clariant) was used. This dispersion is referred to as “Dispersion 4”.
The content of the colorant in the total mass of the dispersion 4 was 11%. Further, the pH of the dispersion 4 was 7.4, the average particle diameter of the colorant was 135 nm, and the viscosity was 2.1 mPa · s.

(H) Preparation of ink [Examples 4 to 6]
Using the aqueous dispersions obtained in Preparation Examples 4 and 5 above, the respective components described in Table 6 below were mixed, and then the impurities were filtered off with a 3 μm membrane filter, whereby the ink composition of each Example was obtained. Obtained. All ink compositions were adjusted so that the total content of the colorant was 5%.
The abbreviations in Table 6 below have the same meaning as the abbreviations in Table 2 above.

(I) Water resistance test A test piece was prepared in the same manner as in the above “(D) Water resistance test” except that the ink compositions of Examples 4 to 6 were used instead of the ink compositions of Examples 1 to 3. , And evaluated with the same evaluation criteria.
As a result, all of the test pieces obtained from the ink compositions of Examples 4 to 6 were evaluated as “A” and exhibited extremely good water resistance.

(J) Light resistance test A test piece was prepared in the same manner as in the above "(E) Light resistance test" except that the ink compositions of Examples 4 to 6 were used instead of the ink compositions of Examples 1 to 3. , And evaluated with the same evaluation criteria.
As a result, all the test pieces obtained from the ink compositions of Examples 4 to 6 were evaluated as “A”, and the test piece had good light resistance.

(K) Evaluation of color developability Two types of plain paper used in the above “D” water resistance test using the ink compositions of Examples 4 to 6 with a commercially available inkjet printer (PX-105 manufactured by Epson Corporation). A yellow colored product was obtained by solid printing. The obtained colored product was used as a test piece, and the color developability (print density) was evaluated using a colorimeter (SpectroEye manufactured by X-Rite) according to the same evaluation criteria as the above “(F) Color developability evaluation”. The results are shown in Table 7.

The test pieces obtained from the ink compositions of Examples 4 to 6 showed good results equivalent to those of Examples 1 to 3 in terms of color developability.

(L) Preparation of aqueous dispersion [Preparation Example 6]
A block copolymer described in Synthesis Example 3 of International Publication No. 2013/115071 was prepared, and the obtained polymer dispersant was dissolved in 8.1 parts and 20 parts of 2-butanone to obtain a uniform solution. A solution obtained by dissolving 0.61 part of sodium hydroxide in 47.6 parts of ion-exchanged water was added to this and stirred for 1 hour to prepare an emulsified solution in which the polymer dispersant was dissolved. At this time, no crystals were precipitated. As the first colorant, C.I. I. 23 parts of Pigment Yellow 120 (Inkjet Yellow H2G manufactured by Clariant) was mixed and dispersed with a sand grinder at 1500 rpm for 15 hours. To the obtained liquid, 100 parts of ion-exchanged water was dropped, and the dispersing beads were separated by filtration. Then, 2-butanone and water were distilled off under reduced pressure using an evaporator to prepare a yellow dispersion liquid. This dispersion is referred to as “Dispersion 5”.
The content of the colorant in the total mass of the dispersion 5 was 12.3%. The pH of dispersion 5 was 8.9, the average particle diameter of the colorant was 109 nm, and the viscosity was 9.5 mPa · s.

(M) Preparation of ink [Comparative Example 3 and Examples 7 to 9]
Using the aqueous dispersions obtained in Preparation Examples 5 and 6 above, the components described in Table 8 below were mixed, and then the contaminants were separated by filtration with a 3 μm membrane filter, whereby Comparative Example 3 and each Example. An ink composition was obtained. All ink compositions were adjusted so that the total content of the colorant was 5%.
The abbreviations in Table 8 below have the same meaning as the abbreviations in Table 2 above.

(N) Water resistance test A test piece was prepared in the same manner as in “(D) Water resistance test” except that the ink compositions of Examples 7 to 9 were used instead of the ink compositions of Examples 1 to 3. , And evaluated with the same evaluation criteria.
As a result, all the test pieces obtained from the ink compositions of Examples 7 to 9 were evaluated as “A” and exhibited extremely good water resistance.

(O) Lightfastness test Each of the ink compositions of Examples and Comparative Examples was printed in a solid color on the following four types of recording materials using a commercially available inkjet printer (PX-101 manufactured by Epson Corporation), thereby producing a yellow color. A colored product was obtained. The obtained colored product was used as a test piece, and exposed to light at a temperature of 24 ° C., a humidity of 60%, and an illuminance of 100 kLux for 2 weeks using a light resistance tester (Xenon Weather Meter manufactured by Suga Test Instruments Co., Ltd.). The color was measured using (SpectroEye manufactured by X-Rite), and the remaining ratio of the colorant was evaluated according to the following three evaluation criteria. The results are shown in Table 9 below.
[Recording material]
Cast coated paper: Oji Paper Co., Ltd. N mirror gloss paper: Oji Paper Co., Ltd. foam gloss plain paper 1: Nippon Paper Industries Co., Ltd. Npi55
Plain paper 2: Mitsubishi Paper Industries PD-W70
[Evaluation criteria]
A: Residual rate 70% or more B: Residual rate 50% or more and less than 70% C: Residual rate less than 50%

All the test pieces obtained from the ink compositions of Examples 7 to 9 showed good results with respect to light resistance.

(P) Color developability evaluation The ink compositions of Examples 7 to 9 and Comparative Example 3 were used in the “(O) Light Resistance Test”, respectively, using a commercially available inkjet printer (PX-105 manufactured by Epson Corporation). A yellow colored product was obtained by solid printing on two types of plain paper and cast coated paper. The obtained colored product was used as a test piece, and the color developability (printing density) was evaluated with a colorimeter (SpectroEye manufactured by X-Rite) according to the following four evaluation criteria. The results are shown in Table 10.
[Evaluation criteria]
A: 1.0 or more B: 0.8 or more and less than 1.0 C: 0.7 or more and less than 0.8 D: Less than 0.7

Each of the test pieces obtained from the ink compositions of Examples 7 to 9 showed good results for color developability.

The ink composition of the present invention is extremely useful as an ink for ink jet recording because it is excellent in various fastness properties, in particular, water resistance, light resistance and color developability.

Claims (18)

1. An ink for inkjet recording containing at least first and second colorants, a water-soluble organic solvent, and water,
   The first colorant is C.I. I. Pigment yellow 213 or 120, and the second colorant is C.I. I. An ink composition for inkjet recording, which is one or more pigments selected from the group consisting of CI Pigment Yellow 74 and 151.
2. 2. The ink composition for ink jet recording according to claim 1, wherein the total content of the colorant is 0.5 to 7% by mass.
3. The ink composition for ink jet recording according to claim 1 or 2, wherein the content of the first colorant in the total mass of the colorant is 20 to 80% by mass.
4. The ink composition for ink jet recording according to claim 1 or 2, wherein the content of the first colorant in the total mass of the colorant is 40 to 60% by mass.
5. The ink composition for inkjet recording according to any one of claims 1 to 4, wherein the water-soluble organic solvent is at least one water-soluble organic solvent selected from the group consisting of glycol ethers and alkanediols.
6. The ink composition for inkjet recording according to claim 5, wherein the glycol ether is at least one selected from the group consisting of ethylene glycol monoallyl ether, ethylene glycol monoisopropyl ether, diethylene glycol monomethyl ether, and propylene glycol monopropyl ether. object.
7. The alkanediol is 1,2-pentanediol, 1,2-hexanediol, 2-methyl-2,4-pentanediol, 2-ethyl-1,3-hexanediol, and 2,4-diethyl-1, The ink composition for ink jet recording according to claim 5 or 6, wherein the ink composition is at least one selected from the group consisting of 5-pentanediol.
8. An ink set for inkjet recording comprising at least each of the ink compositions of a yellow ink composition, a cyan ink composition, a magenta ink composition, and a black ink composition,
   An ink set for ink jet recording using the ink composition for ink jet recording according to any one of claims 1 to 7 as the yellow ink composition.
9. An ink jet recording using the ink composition for ink jet recording according to any one of claims 1 to 7 as an ink, and discharging the ink droplets in accordance with a recording signal to adhere to the recording material. Recording method.
10. By using each ink composition of the ink set for ink jet recording according to claim 8 as an ink, droplets of each ink of the ink set are ejected according to respective recording signals and adhered to a recording material. An ink jet recording method for performing recording.
11. 11. The ink jet recording method according to claim 9, wherein the recording material is an information transmission sheet.
12. 12. The ink jet recording method according to claim 11, wherein the information transmission sheet is a sheet having an ink receiving layer containing a porous white inorganic substance.
13. 12. The ink jet recording method according to claim 11, wherein the information transmission sheet is cast coated paper.
14. 12. The ink jet recording method according to claim 11, wherein the information transmission sheet is coated paper or art paper.
15. 15. The ink jet recording method according to claim 13, wherein the information transmission sheet is a sheet that has been subjected to at least one surface modification treatment selected from corona discharge treatment, plasma treatment, and frame treatment.
16. A colored body colored with the ink composition for inkjet recording according to any one of claims 1 to 7.
17. A colored body colored with the ink set for ink jet recording according to claim 8.
18. An ink jet printer loaded with a container containing at least the ink composition for ink jet recording according to any one of claims 1 to 7.