JP2018039859A - Ink and inkjet recording method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ink that quickly dries even when recorded on recording media having no ink receiving layer, and produces the recorded image with excellent scratch resistance, an inkjet recording method using the ink, and recording media having the ink attached thereto.SOLUTION: An ink contains polyoxyalkylene diglyceryl ether of a specific structure, a colorant, and at least one wax selected from a polyethylene wax and a polypropylene wax, or a wax mixture of them and a paraffin wax. The ink preferably contains a silicon surfactant.SELECTED DRAWING: None

Description

  The present invention relates to an ink, an ink jet recording method using the ink, and a recording medium to which the ink is attached.

  A recording method using an ink jet printer (ink jet recording method) is one of typical methods among various color recording methods. In this method, ink droplets are generated and recorded on various recording media (paper, film, fabric, etc.) for recording. Until now, silver salt photographs and offset printing have been used for recording high-definition images. However, with the advancement of ink jet technology, the ink jet recording method has come to be used for recording high-definition images. In recent years, inkjet recording is being used for industrial purposes. In this application, an increase in recording speed is strongly demanded for ink jet recording.

In the ink jet recording method, various recording media are used. As one of them, there is an ink jet dedicated paper (glossy paper) having an ink receiving layer.
Further, plain paper and non-hardly absorbable recording media with low ink absorption capacity are often used. Since these recording media do not have an ink receiving layer, there is a problem that when used for ink jet recording, the ink is difficult to dry. For example, when double-sided recording is performed by inkjet recording, a situation occurs in which the ink recorded on the front surface does not dry before the recording on the back surface starts. In this case, the undried ink contaminates the parts of the ink jet printer and the back surface of the recording medium, which is a very big problem.
Even in single-sided recording, when the recording media that have already been recorded are stacked, if the drying of the ink is slow, the undried ink is transferred to other recording media, and the recording media is contaminated.
Furthermore, when recording is performed on a recording medium that does not have an ink receiving layer, the fixability of the recorded image becomes a serious problem. For example, there is no color transfer from the recorded image to the finger to the extent that the recorded image is rubbed with a finger. However, even for the same recorded image, when pressure is applied to another non-recording material, color transfer may occur in another non-recording material. Since the recording media after recording are often overlaid, if color transfer occurs between a plurality of recording media in such a case, the recorded image is contaminated. In order to prevent such contamination, it is necessary to improve the fixability of the recorded image on the recording medium.
For this reason, there is an urgent need for an ink that dries ink quickly and has excellent fixability of a recorded image even when a non-hardly absorbable recording medium is used.

Patent Documents 1 to 3 disclose inks containing a compound represented by the following formula (1) described in this specification.
Patent Document 2 discloses a method for producing an aqueous pigment dispersion containing a specific pigment, a styrene-acrylic copolymer, a basic compound, and a polyoxyalkylene adduct of glycerin.
Patent Document 4 discloses an ink comprising at least a colorant, water, a polyorganosiloxane surfactant, and 1,2-alkanediol.
Patent Document 5 discloses an ink composition containing a wax.

JP 2010-59344 A JP 2009-570502 A JP 2002-47438 A Japanese Patent No. 4711172 International Publication No. 2015/147192 No. Gazette

  An object of the present invention is to provide an ink that dries ink quickly and has excellent fixability of a recorded image even when recorded on a recording medium having no ink receiving layer, an ink jet recording method using the ink, and a recording medium to which the ink is attached. To do.

  As a result of intensive studies to solve the above problems, the present inventors have found that the above problems can be solved by an ink containing a compound represented by the following formula (1), a colorant, and a wax. The present invention has been completed.

That is, the present invention relates to the following 1) to 6).
1)
An ink containing a compound represented by the following formula (1), a colorant, and a wax, wherein the wax is at least one wax selected from polyethylene wax and polypropylene wax, or these and paraffin wax An ink that is a mixed wax.

[In the above formula (1),
EO represents an ethyleneoxy group, PO represents a propyleneoxy group, BO represents a butyleneoxy group,
The order in which EO, PO and BO are combined is arbitrary,
m1, m2, m3, m4, n1, n2, n3, n4, q1, q2, q3 and q4 each represents 0 or an integer of 1 or more, but all of them are not 0, and m1 to m4, The sum total of n1 to n4 and q1 to q4 is an average value of more than 0 and 30 or less. ]
2)
The ink according to 1), wherein the wax is polyethylene wax or a mixed wax of polyethylene wax and paraffin wax.
3)
Furthermore, the ink according to 1) or 2) above, which contains a silicon surfactant.
4)
An ink jet recording method for performing recording by ejecting the ink droplet according to any one of 1) to 3) according to a recording signal and attaching the ink droplet to a recording medium.
5)
A recording medium to which the ink according to any one of 1) to 3) is attached.
6)
An inkjet printer comprising a container containing the ink according to any one of 1) to 3).

  According to the present invention, an ink that dries ink quickly and has excellent fixability of a recorded image even when recorded on a recording medium having no ink receiving layer, an ink jet recording method using the ink, and a recording medium to which the ink is attached. I was able to provide it.

  In this specification, “CI” means “color index”. In the present specification, “%” and “parts” including examples and the like are described on a mass basis unless otherwise specified.

[Compound represented by Formula (1)]
The compound represented by the formula (1) can be used as one kind or a mixture of two or more kinds. Hereinafter, unless otherwise specified, the “compound represented by the formula (1)” refers to one compound represented by the formula (1) and two or more compounds represented by the formula (1). Both mixtures are meant.
In formula (1), EO, PO, and BO are all oxygen atoms in “CH ₂ O” or “H—CO” shown on the left side of the parentheses in formula (1), and EO, PO, and BO are Bond with the carbon atom that has it. Similarly, a hydrogen atom represented by “—H” on the right side of the parenthesis is bonded to an oxygen atom of EO, PO, and BO.
The order in which EO, PO, and BO are combined is arbitrary, and can be combined in any arrangement order. That is, an arbitrary combination selected from EO, PO, and BO is randomly combined; one of EO, PO, and BO is combined; and a combination of a plurality of EO is combined with PO And / or a combination of a plurality of BOs combined in a block form;
In formula (1), the sum of m1 to m4, n1 to n4, and q1 to q4 is an average value and is usually greater than 0 and 30 or less, preferably 0.5 to 30, more preferably 5 to 25, and even more preferably 7 -20, particularly preferably 9-14.
The compound represented by the formula (1) is generally known as polyoxyalkylene diglyceryl ether or the like. This compound can be synthesized or obtained as a commercial product.
Examples of commercially available products include SY-DP9 and SY-DP14 manufactured by Sakamoto Pharmaceutical Co., Ltd .; Uniloop DGP-700 and DGP-950 manufactured by NOF Corporation, and the like.
Among the above, in SY-DP9 and DGP-700, m1 to m4 and q1 to q4 in formula (1) are 0, and the sum of n1 to n4 is 9 on average; SY-DP14 and DBP-950 are Similarly, m1 to m4 and q1 to q4 are 0, and the sum of n1 to n4 is an average value of 14;
The content of the compound represented by the formula (1) in the total mass of the ink composition is usually 0.1 to 30%, preferably 0.1 to 20%, more preferably 0.2 to 20%. .

[Colorant]
The colorant contained in the ink is not particularly limited, and a colorant selected from a water-soluble colorant and a water-insoluble colorant can be used. Moreover, these can also be used together as needed.
In the present specification, “water-insoluble” means that the solubility of the colorant in water at 25 ° C. is usually 3 g / liter or less, preferably 2 g / liter or less, more preferably 1 g / liter or less.
Examples of the water-insoluble colorant include pigments, disperse dyes, and solvent dyes. Typical examples of these colorants are C.I. I. Pigment, C.I. I. Disperse and C.I. I. Colorants selected from Solvent are mentioned.

  Examples of the water-soluble colorant include direct dyes, acid dyes, food dyes, basic dyes, reactive dyes, vat dyes, and soluble vat dyes. Representative examples of these dyes are C.I. I. Direct, C.I. I. Acid, C.I. I. Food, C.I. I. Basic, C.I. I. Reactive, C.I. I. Vat, C.I. I. Mention may be made of dyes selected from Solubilized Vat.

  As a colorant other than those described above, a resin containing a colorant in which the above colorant is contained in a transparent and water-insoluble resin can also be cited as a water-insoluble colorant.

Examples of the pigment include inorganic pigments, organic pigments and extender pigments.
Examples of the inorganic pigment include carbon black; metal oxide, hydroxide, sulfide; ferrocyanide; and metal chloride.

  Examples of carbon black include thermal black, acetylene black, oil furnace black, gas furnace black, lamp black, gas black, and channel black. Of these, furnace black, lamp black, acetylene black, channel black and the like are preferable. Various types of carbon black can be easily obtained from, for example, Columbian Carbon, Cabot, Degussa, Mitsubishi Chemical, and the like.

  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 and quinophthalones. Pigments.

  Specific examples of the organic pigment include C.I. I. Pigment Yellow 1, 2, 3, 12, 13, 14, 16, 17, 24, 55, 73, 74, 75, 83, 93, 94, 95, 97, 98, 108, 114, 128, 129, 138, 139, 150, 151, 154, 180, 185, 193, 199, 202; 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, 255, 257, 260, 264, 272; I. Pigment Blue 1, 2, 3, 15, 15: 1, 15: 2, 15: 3, 15: 4, 15: 6, 16, 22, 25, 60, 66, 80; C.I. I. Pigment Violet 19, 23, 29, 37, 38, 50; C.I. I. Pigment Orange 13, 16, 68, 69, 71, 73; C.I. I. Pigment Green 7, 36, 54; C.I. I. Pigment Black 1; and the like.

  Examples of extender pigments include silica, calcium carbonate, talc, clay, barium sulfate, and white carbon. These extender pigments are not used alone. Usually, it is used in combination with an inorganic pigment or an organic pigment for the purpose of improving the fluidity of the powder.

  In addition, a self-dispersing pigment imparted with a self-dispersibility by chemical treatment on the surface of the pigment particles can also be used.

  Examples of disperse dyes include C.I. I. Dispers Yellow 9, 23, 33, 42, 49, 54, 58, 60, 64, 66, 71, 76, 79, 83, 86, 90, 93, 99, 114, 116, 119, 122, 126, 149, 160, 163, 165, 180, 183, 186, 198, 200, 211, 224, 226, 227, 231, 237; I. Dispers Red 60, 73, 88, 91, 92, 111, 127, 131, 143, 145, 146, 152, 153, 154, 167, 179, 191, 192, 206, 221, 258, 283; I. Dispers Orange 9, 25, 29, 30, 31, 32, 37, 38, 42, 44, 45, 53, 54, 55, 56, 61, 71, 73, 76, 80, 96, 97; C.I. I. Dispers Violet 25, 27, 28, 54, 57, 60, 73, 77, 79, 79: 1; I. Dispers Blue 27, 56, 60, 79: 1, 87, 143, 165, 165: 1, 165: 2, 181, 185, 197, 202, 225, 257, 266, 267, 281, 341, 353, 354, 358, 364, 365, 368;

  A single colorant can be used as the colorant. Two or more types can be used in combination for the purpose of fine adjustment of hue.

  The content of the colorant in the total mass of the ink is usually 1 to 30%, preferably 1 to 15%, more preferably 2 to 10%.

When the ink contains a water-insoluble colorant, it is preferable to further contain a dispersant. Dispersants 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 At least two monomers selected from the group consisting of: vinyl acetate, vinyl alcohol, vinyl pyrrolidone, acrylamide, and derivatives thereof; and the like (preferably at least one of these); A copolymer composed of one hydrophilic monomer).
As a kind of copolymer, a block copolymer, a random copolymer, a graft copolymer, and / or their salts etc. are mentioned, for example.
The dispersant can be synthesized or obtained as a commercial product. Specific examples of commercially available products include, for example, styrene-acrylic resins such as Jonkrill 62, 67, 68, 678, and 687 manufactured by Johnson Polymer Co., Ltd .; Vinyl S-100A (modified vinyl acetate manufactured by Hoechst Chemical Co., Ltd.) Resin); Jurimer AT-210 (polyacrylic acid ester copolymer manufactured by Nippon Pure Chemicals Co., Ltd.);
When the dispersant is synthesized, a dispersant disclosed in International Publication No. 2013/115071 gazette is preferably exemplified.
One type of dispersant can be used, or two or more types can be used in combination.

  The weight average molecular weight (MW) of the dispersant is not particularly limited, but is usually 3000 to 50000, preferably 7000 to 25000. Moreover, as an acid value, it is 50-300 KOHmg / g normally, Preferably it is 80-275 KOHmg / g, More preferably, it is about 80-250 KOHmg / g.

  The dispersant can be used in a state mixed with a colorant. Further, the surface of the colorant can be coated with a dispersant and used as a so-called microencapsulated pigment. Moreover, both of these can also be used together.

  When a water-insoluble colorant is used, the average particle size is usually 300 nm or less, preferably 50 nm to 200 nm, more preferably 60 nm to 120 nm. The average particle size can be measured using laser light scattering.

When the ink contains a water-insoluble colorant, it is preferable to prepare a dispersion containing a colorant and a dispersant and then mix with other components to prepare the ink. A known method can be used as a method for preparing the dispersion.
As an example, a phase inversion emulsification method can be used when the dispersant does not dissolve in water. That is, the first polymer is dissolved in an organic solvent such as 2-butanone, and an aqueous solution of a neutralizing agent is added to prepare an emulsion. A colorant is added to the obtained emulsion to perform a dispersion treatment. An organic solvent and a part of water are distilled off under reduced pressure from the liquid thus obtained, whereby a target colorant dispersion can be obtained.
Examples of the dispersion treatment include a method in which a colorant and a polymer are placed in a sand mill (bead mill), a roll mill, a ball mill, a paint shaker, an ultrasonic disperser, a microfluidizer, and the like to perform dispersion. As an example, when a sand mill is used, beads having a particle diameter of about 0.01 mm to 1 mm can be used, and a dispersion treatment can be performed by appropriately setting the filling rate of the beads.
Operations such as filtration and / or centrifugation can be performed on the dispersion obtained as described above. By this operation, the particle diameters of the particles contained in the dispersion can be made uniform.

[wax]
The wax is preferably a wax emulsion, and more preferably an aqueous wax emulsion. Natural wax and chemically synthesized wax can be used as the wax.
Natural waxes include petroleum waxes such as paraffin wax and microcrystalline wax, lignite waxes such as montan wax, plant waxes such as carnauba wax and canderia wax, beeswax and lanolin as animal and plant waxes, etc. And an emulsion in which is dispersed in an aqueous medium.
Chemically synthesized waxes include homopolymer waxes such as polyethylene, polypropylene, and Fischer-Trop, and emulsions in which copolymer waxes such as ethylene vinyl acetate and ethylene acrylic acid are dispersed in an aqueous medium.
These waxes can be used alone or in combination.
Among the above, the wax emulsion is preferably at least one wax selected from polyethylene wax and polypropylene wax, or a mixed wax of these and paraffin wax; more preferably polyethylene wax or polyethylene wax and paraffin wax And an emulsion in which a mixed wax is dispersed in an aqueous medium.
The particle size of the wax emulsion is preferably 5 μm or less, and more preferably 1 μm or less in order to prevent clogging of the inkjet head. The lower limit is about 20 nm.
The product marketed as a wax emulsion, for example, BYK Co. CERAFLOUR925, CERAFLOUR929, CERAFLOUR950, CERAFLOUR991, AQUACER498, AQUACER507, AQUACER515, AQUACER526, AQUACER531, AQUACER537, AQUACER539, AQUACER552, AQUACER1547, AQUAMAT208, AQUAMAT263, AQUAMAT272, MINERPOL221 Mitsui High Wax NL100, Mitsui High Wax NL200, Mitsui High Wax NL500, Mitsui High Wax 4202E, Mitsui High Wax 1105A, Mitsui High Wax 2203A, Mitsui High Box NP055, Mitsui Hi-wax NP505, and the like; manufactured by Sanyo Chemical Industries, Ltd. of KUE-100, KUE-11 and the like.
Of these wax agents, AQUACER 531, AQUACER 537, AQUACER 593 and AQUACER 1547 are preferable, and AQUACER 531 and AQUACER 1547 are more preferable.
The total wax content in the total mass of the ink composition is usually 0.1% to 10%, preferably 0.3% to 8%, more preferably 0.5% to 6%, and even more preferably 1%. ~ 6%.

[Silicon surfactant]
Examples of the silicon surfactant include polyether-modified siloxane and polyether-modified polydimethylsiloxane. Among them, polyether-modified polydimethylsiloxane represented by the following formula (2) is preferable.
Examples of commercially available silicon surfactants include DYNOL 960, DYNOL 980 (manufactured by Air Products), Silface SAG001, Silface SAG002, Silface SAG003, Silface SAG005, Silface SAG503A, Silface SAG008, and Silface. Examples include SAG009, Silface SAG010 (manufactured by Nissin Chemical Co., Ltd.), BYK-345, BYK-347, BYK-348, BYK-349, BYK-3455 (manufactured by BYK Chemie).
The content of the silicon surfactant in the total mass of the ink composition is usually 0.01 to 3%, preferably 0.01 to 2.5%, more preferably 0.02 to 2.0%.

  In said Formula (2), a is an integer of 0-5, b is an integer of 1-5, c is an integer of 3-30, d is an integer of 0-20.

  The ink may contain an ink preparation agent as necessary. Examples of the ink preparation agent include water-soluble organic solvents, preservatives, antifungal agents, pH adjusters, chelating reagents, rust preventives, water-soluble ultraviolet absorbers, antioxidants, and surfactants.

  Examples of the water-soluble organic solvent include C1- such as methanol, ethanol, propanol, isopropanol, butanol, isobutanol, sec-butanol or tert-butanol, 1,2-hexanediol, 1,6-hexanediol, trimethylolpropane, and the like. C6 alkanol; carboxylic acid amides such as N, N-dimethylformamide or N, N-dimethylacetamide; lactams such as 2-pyrrolidone, N-methyl-2-pyrrolidone or N-methylpyrrolidin-2-one; Cyclic ureas such as dimethylimidazolidin-2-one or 1,3-dimethylhexahydropyrimido-2-one; ketones such as acetone, 2-methyl-2-hydroxypentan-4-one, ethylene carbonate; Ketoalcohol; tetrahydrofuran, dioxane Cyclic ethers of ethylene glycol, diethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, 1,2-butylene glycol, 1,4-butylene glycol, 1,6-hexylene glycol, diethylene glycol, triethylene glycol , Tetraethylene glycol, dipropylene glycol, mono-, oligo- or polyalkylene glycol or thio having C2-C6 alkylene units such as polyethylene glycol having a molecular weight of 400, 800, 1540 or higher, polypropylene glycol, thiodiglycol or dithiodiglycol Glycol; polyol (triol) such as glycerin, diglycerin, hexane-1,2,6-triol; ethylene glycol monomethyl ether, ethylene glycol Cole monoethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether (butyl carbitol), triethylene glycol monomethyl ether, triethylene glycol monoethyl ether, ethylene glycol monoallyl ether, ethylene glycol monoisopropyl ether, diethylene glycol monomethyl ether, propylene glycol C1-C4 alkyl ethers of polyhydric alcohols such as monopropyl ether and triethylene glycol monobutyl ether; γ-butyrolactone or dimethyl sulfoxide;

Examples of preservatives include, for example, organic sulfur, organic nitrogen sulfur, organic halogen, haloaryl sulfone, iodopropargyl, haloalkylthio, nitrile, pyridine, 8-oxyquinoline, benzothiazole , Isothiazoline, dithiol, pyridine oxide, nitropropane, organotin, phenol, quaternary ammonium salt, triazine, thiazine, anilide, adamantane, dithiocarbamate, brominated indanone, benzyl Examples thereof include bromoacetate-based or inorganic salt-based compounds.
Specific examples of commercially available preservatives include trade names Proxel GXL (S) and Proxel XL-2 (S) manufactured by Arch Chemical Co., Ltd.

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

  As the pH adjuster, any substance can be used as long as it can control the pH within the above range without adversely affecting the prepared ink composition. 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 or sodium uracil diacetate.

  Specific examples of the rust inhibitor include acidic sulfite, sodium thiosulfate, ammonium thioglycolate, diisopropylammonium nitrite, pentaerythritol tetranitrate or dicyclohexylammonium nitrite.

  Examples of water-soluble ultraviolet absorbers include sulfonated benzophenone compounds, benzotriazole compounds, salicylic acid compounds, cinnamic acid compounds, and triazine compounds.

  As examples of the antioxidant, for example, various organic and metal complex anti-fading agents can be used. Examples of the organic anti-fading agent include hydroquinones, alkoxyphenols, dialkoxyphenols, phenols, anilines, amines, indanes, chromans, alkoxyanilines or heterocyclic rings. .

  Examples of the surfactant include known surfactants such as anion, cation, nonion, amphoteric, and fluorine.

  Examples of 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, 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 sulfone Acid salts, diethylsulfosuccinate, diethylhexylsulfosuccinate, dioctylsulfosuccinate and the like. Specific examples of commercially available products include, for example, Haitenol LA-10, LA-1 , LA-16, neo-Hitenol ECL-30S, ECL-45 (or more, Dai-ichi Kogyo Seiyaku Co., Ltd.).

  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 Acetylene glycol (alcohol) type such as lu-1-hexyn-3-ol; trade name Surfynol 104, 105PG50, 82, 420, 440, 465, 485, Olphine STG; SIGMA-ALDRICH TergItol15-S-7 etc.);

  Examples of amphoteric surfactants include lauryldimethylaminoacetic acid betaine, 2-alkyl-N-carboxymethyl-N-hydroxyethylimidazolinium betaine, coconut oil fatty acid amidopropyldimethylaminoacetic acid betaine, polyoctylpolyaminoethylglycine, and imidazoline derivatives. Can be mentioned.

  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. Examples include Zonyl TBS, FSP, FSA, FSN-100, FSN, FSO-100, FSO, FS-300, Capstone FS-30, FS-31 manufactured by DuPont; PF-151N, PF manufactured by Omninova -154N; F-114, F-410, F-444, EXP. TF-2066, EXP. TF-2148, EXP. TF-2149, F-430, F-477, F-552, F-553, F-554, F-555, F-556, F-557, F-558, F-559, F-561, F- 562, R-40, R-41, RS-72-K, RS-75, RS-76-E, RS-76-NS, RS-77, EXP. TF-1540, EXP. TF-1760; BYK-3440, BYK-3441, etc. manufactured by Big Chemie.

The pH of the ink is usually 5 to 11, preferably 7 to 10 for the purpose of improving storage stability.
The surface tension of the ink is usually 10 to 50 mN / m, preferably 20 to 40 mN / m.
The viscosity of the ink is usually 30 mPa · s or less, preferably 20 mPa · s or less. The lower limit is 0.1 or more.
The pH and surface tension of the ink can be appropriately adjusted by using an ink preparation agent such as a pH adjuster or a surfactant.

When the ink is used for inkjet recording, it is preferable to remove inorganic impurities in the ink. Examples of inorganic impurities include metal cation chloride (for example, sodium chloride) and sulfate (for example, sodium sulfate). The content of inorganic impurities is preferably 1% or less with respect to the total mass of the colorant contained in the ink. The lower limit can be made below the detection limit of the analytical instrument.
As a method for removing inorganic impurities, for example, a method using a reverse osmosis membrane; a method in which a coloring agent is suspended and purified in a mixed solvent of a water-soluble organic solvent and water; and a method in which inorganic impurities are adsorbed with an ion exchange resin And the like.

  The ink and the dispersion liquid can remove impurities and the like by performing microfiltration using a membrane filter, glass filter paper, or the like as necessary. When microfiltration is performed, the pore size of the filter or the like is usually about 0.5 μm to 20 μm, preferably about 0.5 μm to 10 μm.

  In all of the above-described components, contents, etc., a preferable combination is more preferable, and a more preferable combination is more preferable. The same applies to combinations of preferable and more preferable ones.

Examples of the ink jet recording method include an ink jet recording method in which recording is performed by ejecting the ink droplets according to a recording signal and attaching them to a recording medium.
The ink is injected into containers called “ink tanks”, “ink cartridges” and the like and supplied to an ink jet printer.

Examples of the ink jet method include a charge control method; a drop-on-demand method (pressure pulse method) using vibration pressure of a piezo element; an acoustic ink jet method; a thermal ink jet method;
The ink can be used in any of these methods.

  The recording medium means a substance to which the ink can adhere. The material is not limited as long as the ink can be attached. Among such recording media, for example, coated paper such as fine coated paper, art paper, coated paper, matte paper, cast paper; plain paper, gravure printing, offset printing, etc. that do not have an ink receiving layer Media used: Ink-jet exclusive paper, ink-jet exclusive film, glossy paper, gloss film or the like having an ink receiving layer; fiber or cloth (cellulose, nylon, wool, etc.); leather; substrate for color filter; A recording medium to which the ink is attached is also included in the scope of the present invention.

The ink of the present invention has high color developability even when recorded on paper having no ink receiving layer. Further, even when recording is performed on a recording medium having low ink absorption ability and non-absorptive absorbability, the ink dries quickly and the fixability of the ink is good.
Further, when recording on various recording media, it is possible to obtain a high-quality recorded image with high color development and no mottling regardless of the presence or absence of the ink receiving layer.
In addition, the ink of the present invention has excellent storage stability and good ejection properties. Further, since the inkjet head is not clogged, the maintainability is also good.

Hereinafter, the present invention will be described in more detail with reference to examples. However, the present invention is not limited by the following examples.
For measurement of the average particle size, a dynamic light scattering particle size distribution measuring device LB-500 manufactured by Horiba, Ltd. was used. The solid content in the aqueous solution was measured by dry weight method using MS-70 manufactured by A & D Corporation.

[Preparation Example 1]: Preparation of dispersion 1.
A block copolymer described in Synthesis Example 3 of International Publication No. 2013/115071 was prepared. 7.5 parts of the obtained polymer dispersant was dissolved in 20 parts of 2-butanone to obtain a uniform solution. A solution prepared by dissolving 0.6 part of sodium hydroxide in 46 parts of ion exchange water was added to this solution, and stirred for 1 hour to prepare an emulsified solution. In this emulsified solution, beads for dispersion and C.I. I. Pigment Blue 15: 3 (25 parts) was added, and dispersion was performed with a sand grinder. Dispersion was performed at 1500 rpm for 15 hours. To the obtained liquid, 150 parts of ion-exchanged water was dropped and filtered to separate the beads for dispersion. From the obtained filtrate, 2-butanone and a part of water were distilled off under reduced pressure by an evaporator to obtain a dispersion having a pigment solid content of 12.0% and an average particle size of 106 nm. This is designated as “Dispersion 1”.

[Example 1 and Example 2]: Preparation of ink.
Each component described in Table 2 below was added and mixed by stirring to obtain a liquid. The obtained liquid was filtered through a membrane filter having a pore size of 3 μm to obtain each ink of Example 1 and Example 2.
In Table 1, the numerical value of each component means the number of copies. The “remainder” means that the total amount of ink is adjusted to 100 parts by adding ion exchange water.

[Comparative Example 1]: Preparation of comparative ink.
A comparative ink of Comparative Example 1 was obtained in the same manner as in Example 1 except that each component used in Example 1 was replaced with the component of Comparative Example 1 shown in Table 2 below.
The viscosity of the inks of Examples and Comparative Examples was adjusted to be 5.3 to 6 mPa · s suitable for inkjet recording.

Abbreviations in Table 1 below have the following meanings. The symbol “-” means that the component is not contained. The numerical values in Table 1 are “parts”.
DGP7: NOF Corporation make, DGP-700 (polyglycol glycol ether adduct of diglycerin).
PG: Propylene glycol.
1,2HD: 1,2-hexanediol.
AQ531: Product name AQUACER531 (solid content: 45%) manufactured by Big Chemie.
AQ515: Product name AUACER515 (solid content: 35%) manufactured by Big Chemie.
BYK-349: Product name BYK-349, manufactured by Big Chemie.
GXL (S): manufactured by Arch Chemical Co., Ltd., trade name Proxel GXL (S).

[Inkjet recording]
Using each ink composition obtained in Examples and Comparative Examples, an image of 100% Duty was inkjet recorded on the following recording medium using an inkjet printer (trade name PX-205, manufactured by EPSON Corporation). The recording media to which the obtained inks were attached were used as test pieces, and the following quick drying test and fixability test were performed.
Coated paper 1: Aurora coat (Nippon Paper Industries Co., Ltd .: 85 g / m ² ).
Coated paper 2: Finess Gloss (manufactured by UPM: 80 g / m ² ).

[Quick drying test]
In [Inkjet recording], the test piece was rubbed with a cotton swab every 5 seconds immediately after the coated paper 1 test piece was obtained, and the time until ink no longer adhered to the swab was measured. The evaluation results are shown in Table 2 below.

[Fixability test]
The test piece of coated paper 2 obtained in the above [Inkjet recording] was dried at 90 ° C. for 5 minutes. The dried recording surface of the coated paper 2 and the white surface of the new coated paper 2 were overlapped to obtain a two-layered coated paper 2. A load of 200 g was reciprocated 10 times with respect to the obtained two-layered coated paper 2, and then the new coated paper 2 was peeled off. The state of the obtained new coated paper 2 and the test piece was visually observed and evaluated according to the following evaluation criteria. The evaluation results are shown in Table 2 below.
In the following evaluation criteria, “white paper surface” means the white paper surface of the new coated paper 2, and “recording surface” means the recording surface of the coated paper 2.
[Evaluation criteria]
A: Color transfer to the white paper surface and / or slight damage to the image on the recording surface is observed.
B: Color transfer to the white paper surface and / or scratches on the image on the recording surface are observed.
C: Color transfer to the white paper surface and scratches on the image on the recording surface are very large.

  As is apparent from the results in Table 2, it was confirmed that the ink compositions of the examples were quickly dried and recorded images having good fixability even when recorded on a recording medium having a low ink absorption capability. .

  The ink of the present invention has high color developability even when recorded on general-purpose plain paper having no ink-receiving layer, and also dries quickly and does not cause mottling even when recorded on a recording medium having a low ink absorption capability. Since a high-quality recorded image can be obtained, it is extremely useful as an inkjet recording ink.

Claims (6)

An ink containing a compound represented by the following formula (1), a colorant, and a wax, wherein the wax is at least one wax selected from polyethylene wax and polypropylene wax, or these and paraffin wax An ink that is a mixed wax.

[In the above formula (1),
EO represents an ethyleneoxy group, PO represents a propyleneoxy group, BO represents a butyleneoxy group,
The order in which EO, PO and BO are combined is arbitrary,
m1, m2, m3, m4, n1, n2, n3, n4, q1, q2, q3 and q4 each represents 0 or an integer of 1 or more, but all of them are not 0, and m1 to m4, The sum total of n1 to n4 and q1 to q4 is an average value of more than 0 and 30 or less. ]   The ink according to claim 1, wherein the wax is polyethylene wax or a mixed wax of polyethylene wax and paraffin wax.   The ink according to claim 1, further comprising a silicon surfactant.   An ink jet recording method for performing recording by ejecting the ink droplets according to any one of claims 1 to 3 in accordance with a recording signal and attaching the ink droplets to a recording medium.   A recording medium to which the ink according to claim 1 is attached.   An inkjet printer provided with the container containing the ink as described in any one of Claims 1-3.