JP5678496B2 - Ink jet recording ink, ink cartridge, ink jet recording apparatus, ink jet recording method, and ink recorded matter - Google Patents

Description

  The present invention provides an ink jet recording ink which can obtain a high image density, is excellent in image sharpness, is improved in clogging of an ink jet head, is excellent in ink ejection stability, and is excellent in storage stability, and the ink jet The present invention relates to an ink cartridge, an ink jet recording apparatus, an ink jet recording method, and an ink recorded matter using a recording ink.

  The inkjet recording method is easy to make full color because the process is simpler than other recording methods, and there is an advantage that a high-resolution image can be obtained even with an apparatus having a simple configuration.

  Ink jet recording inks used in such an ink jet recording system include dye-based inks and pigment-based inks. Dye-based inks are excellent in color tone sharpness but have the disadvantage of poor light resistance. On the other hand, pigment-based inks are superior in light resistance compared to dye-based inks. Therefore, pigment-based inks are actively researched. However, pigment-based inks have a problem that nozzles are more likely to be clogged than dye-based inks.

Pigment-based inks include water-based inks in which pigments are dispersed in water. In such water-based inks, surfactants and water-soluble resins are used to disperse hydrophobic pigments. Although it is general, there is a problem that the sharpness of the obtained image is extremely poor.
In order to improve the sharpness of the image, a technique for adding resin-forming resin fine particles to the ink has been proposed. However, a plurality of fine particles including the resin fine particles have a problem of low dispersion stability. Further, when the dispersion stability is poor, there are problems that a high image density cannot be obtained and storage stability is deteriorated.

As a technique for solving these problems, a method of incorporating a water-insoluble coloring material and a chargeable resin pseudo fine particle smaller than the coloring material in the ink (Patent Document 1), a self-dispersing pigment in which the DBP oil absorption amount of the pigment is limited A water-based carbon black dispersion (Patent Document 3) containing a surface-modified carbon black and a nonionic surfactant having an HLB value of 7 to 18 and having an acetylene skeleton, A water-based ink using an acetylene glycol surfactant (Patent Document 4) has been proposed.
In addition, a method of dispersing a water-dispersible resin having a carboxyl group and a nonionic hydrophilic group in the molecule in water (Patent Document 5), a method of making the water-soluble polymer and surfactant the same polarity, or adding nonions (patent) Document 6), a method of making the hydrophilic group polarities of the colored ionic polyester resin and the colorant the same in the aqueous recording liquid (Patent Document 7), and a method of making the dispersion polarity of the pigment and the resin fine particles the same (Patent Document 8). A printing ink using a Gemini surfactant as a dispersant (Patent Document 9) has been proposed.
Also, an aqueous ink containing a pigment dispersion containing pigment particles having a specific particle size distribution (Patent Document 10), a recording liquid containing an aqueous medium containing a pigment, a polymer dispersant, and a nonionic surfactant (Patent Document 10) 11), pigment dispersants comprising AB or BAB block copolymers (Patent Documents 12 and 13), aqueous pigments containing specific pigments, water-soluble resins and solvents (Patent Document 14), volume average particles of dispersed particles A recording liquid having a diameter of 30 nm to 200 nm (Patent Document 15) has been proposed.
Further, as a pigment dispersion method without using a dispersant, a method of introducing a substituent containing a water-solubilizing group into carbon black (Patent Document 16), a method of polymerizing a water-soluble monomer or the like on the surface of carbon black (Patent Document 17). , A method of oxidizing carbon black (Patent Document 18), an ink containing an oxidized carbon black and a terpolymer composed of acrylic acid, styrene, and α-methylstyrene (Patent Document 19). Yes.
However, the above-described conventional ink can obtain a certain high image density with respect to the color pigment ink, but is not sufficient with respect to the black pigment ink.

In addition, for the purpose of improving dispersion stability by devising a manufacturing method, a technique using beads having a bead diameter of about 0.05 mm to 1.0 mm used for dispersing the bead mill at the time of dispersion has been proposed (patent) Literature 20, Patent Literature 21, Patent Literature 22). However, none of these proposed techniques are satisfactory in terms of dispersion stability.
An ink containing an anionic surfactant having a molecular weight of 1,000 to 30,000 has been proposed (Patent Document 23). However, this proposed technique has a problem that the dispersion stability is not sufficient, and in particular, a pigment type that is weak against a strong impact at the time of dispersion deteriorates the ejection stability with ink.
Further, inks using a diisobutylene-maleic acid copolymer have been proposed (Patent Documents 24 and 25). However, these proposed techniques are not satisfactory in terms of dispersion stability, and are not satisfactory in terms of image density.
In addition, an ink containing a hydrophilic polymer compound into which a carboxyl group has been introduced has been proposed (Patent Document 26). However, this proposed technique is not satisfactory in terms of image density and image sharpness.
In addition, for the purpose of improving storage stability and ejection stability, the addition of a specific fluorine-based surfactant and the addition of a silicone-based antifoaming agent followed by a specific filtration method improve the defoaming property. A method to do this has been proposed (Patent Document 27). However, this proposed technique improves the foaming problem, but the silicone-based antifoaming agent used is incompatible with the water-based ink, so that it remains in the liquid flow path of the ink jet recording apparatus. As a result, the discharge stability may deteriorate.

  In any of the above-described techniques, an ink for ink-jet recording that provides high image density, excellent image sharpness, improved clogging of the ink-jet head, excellent ink ejection stability, and excellent storage stability is obtained. Not obtained.

  Therefore, a high image density is obtained, the image sharpness is excellent, the clogging of the inkjet head is improved, the ink ejection stability is excellent, and the storage stability is excellent, and the inkjet recording ink At present, there is a demand for providing an ink cartridge, an ink jet recording apparatus, an ink jet recording method, and an ink record using a recording ink.

  An object of the present invention is to solve the above-described problems and achieve the following objects. That is, the present invention provides a high image density, excellent image sharpness, improved clogging of an inkjet head, improved ink ejection stability, and further excellent storage stability, and an inkjet recording ink, and An object of the present invention is to provide an ink cartridge, an ink jet recording apparatus, an ink jet recording method, and an ink recorded matter using the ink for ink jet recording.

Means for solving the problems are as follows. That is,
<1> An ink for inkjet recording comprising a colorant, a dispersant, a fluorine compound, water, and a wetting agent,
The dispersant is a copolymer containing at least styrene and acrylamide as structural units,
An ink for ink jet recording, wherein the fluorine compound is at least one of a fluorine compound represented by the following general formula (1) and a fluorine compound represented by the following general formula (2).
However, the general formula (1), Rf are each _{independently, CF 3, C 2 F 5} , C 3 F 7, and represent any one of _C 4 _{F 9.} M represents any of H, Li, K, Na, and NH ₄ .
However, the in general formula (2), M represents H, Li, K, Na, and one of NH _4.
<2> The ink for inkjet recording according to <1>, wherein the content of the fluorine compound is 0.1% by mass to 10% by mass.
<3> The inkjet recording ink according to any one of <1> to <2>, wherein the wetting agent is at least one selected from diethylene glycol, glycerin, 2-pyrrolidone, and diethylene glycol monobutyl ether.
<4> Further, any of <1> to <3>, further containing at least one of 2-ethyl-1,3-hexanediol and 2,2-dimethyl-1,3-propanediol as a penetrant An ink for ink-jet recording as described above.
<5> The ink for inkjet recording according to any one of <1> to <4>, wherein the dispersant is a copolymer containing styrene, acrylamide, and maleic acid as structural units.
<6> An ink cartridge comprising the ink-jet recording ink according to any one of <1> to <5>, contained in a container.
<7> Inkjet recording comprising at least ink flying means for recording an image by applying a stimulus to the inkjet recording ink according to any one of <1> to <5> and causing the ink to fly. Device.
<8> Inkjet recording comprising at least an ink flying step of recording an image by applying a stimulus to the inkjet recording ink according to any one of <1> to <5> and causing the ink to fly. Is the method.
<9> An ink recorded matter comprising an image formed on the recording medium using the ink for ink jet recording according to any one of <1> to <5>.

  According to the present invention, the conventional problems can be solved, a high image density is obtained, the image sharpness is excellent, the clogging of the ink jet head is improved, the ink ejection stability is excellent, and the storage is further performed. Ink jet recording ink having excellent stability, and an ink cartridge, an ink jet recording apparatus, an ink jet recording method, and an ink recorded matter using the ink for ink jet recording can be provided.

FIG. 1 is a perspective view showing an example of the ink jet recording apparatus of the present invention.

(Inkjet recording ink)
The ink for inkjet recording of the present invention contains at least a colorant, a dispersant, a fluorine compound, water, and a wetting agent, preferably contains a penetrating agent, and further contains other components as necessary. contains.

<Colorant>
There is no restriction | limiting in particular as said coloring agent, According to the objective, it can select suitably, For example, an inorganic pigment, an organic pigment, etc. are mentioned.

  Examples of the inorganic pigment include titanium oxide, iron oxide, calcium carbonate, barium sulfate, aluminum hydroxide, barium yellow, cadmium red, chrome yellow, and carbon black. Among these, carbon black is preferable. In addition, as said carbon black, what was manufactured by well-known methods, such as a contact method, a furnace method, and a thermal method, is mentioned, for example.

There is no restriction | limiting in particular as a color of the said coloring agent, According to the objective, it can select suitably, For example, the thing for black, the thing for color, etc. are mentioned. These may be used individually by 1 type and may use 2 or more types together.

Examples of the black color include carbon blacks such as furnace black, lamp black, acetylene black, and channel black (CI Pigment Black 7).
), Copper, iron (CI Pigment Black 11), metals such as titanium oxide, organic pigments such as aniline black (CI Pigment Black 1), and the like.

  Specific examples of carbon black include, for example, # 10B, # 20B, # 30, # 33, # 40, # 44, # 45, # 45L, # 50, # 55, # 95, # 260 manufactured by Mitsubishi Chemical Corporation. # 900, # 1000, # 2200B, # 2300, # 2350, # 2400B, # 2650, # 2700, # 4000B, CF9, MA8, MA11, MA77, MA100, MA220, MA230, MA600, MCF88; manufactured by Cabot Corporation Monarch 120, Monarch 700, Monarch 800, Monarch 880, Monarch 1000, Monarch 1100, Monarch 1300, Monarch 1400, Mogal L, Legal 99R, Legal 250R, Legal 300R, Legal 330R, Legal 400R, Legal 500R, Legal 660R; Made Printex A, Printex G, Printex U, Printex V, Printex 55, Printex 140U, Printex 140V, Special Black 4, Special Black 4A, Special Black 5, Special Black 6, Special Black 100, Special Black 250, color black FW1, color black FW2, color black FW2V, color black FW18, color black FW200, color black S150, color black S160, color black S170, and the like.

As for the color, for yellow, for example, C.I. I. Pigment Yellow 1 (Fast Yellow G), 3, 12 (Disazo Yellow AAA), 13, 14, 17, 23, 24, 34, 35, 37, 42 (Yellow Iron Oxide), 53, 55, 74, 81, 83 (Disazo Yellow HR), 95, 97, 98, 100, 101, 104, 108, 109, 110, 117, 120, 128, 138, 150, 153 and the like.
For magenta, for example, C.I. I. Pigment Red 1, 2, 3, 5, 17, 22 (Brilliant First Scarlet), 23, 31, 38, 48: 2 (Permanent Red 2B (Ba)), 48: 2 (Permanent Red 2B (Ca)), 48 : 3 (Permanent Red 2B (Sr)), 48: 4 (Permanent Red 2B (Mn)), 49: 1, 52: 2, 53: 1, 57: 1 (Brilliant Carmine 6B), 60: 1, 63: 1, 63: 2, 64: 1, 81 (Rhodamine 6G Lake), 83, 88, 92, 101 (Bengara), 104, 105, 106, 108 (Cadmium Red), 112, 114, 122 (Dimethylquinacridone), 123, 146, 149, 166, 168, 170, 172, 177, 178, 179, 185, 190, 193, 209, 2 9 and the like.
For cyan, for example, C.I. I. Pigment Blue 1, 2, 15 (copper phthalocyanine blue R), 15: 1, 15: 2, 15: 3 (copper phthalocyanine blue G), 15: 4, 15: 6 (phthalocyanine blue E), 16, 17: 1 , 56, 60, 63 and the like.
Intermediate colors include red, green and blue, C.I. I. Pigment red 177, 194, 224, C.I. I. Pigment orange 43, C.I. I. Pigment violet 3, 19, 23, 37, C.I. I. Pigment green 7, 36, and the like.

  There is no restriction | limiting in particular as content of the said colorant, According to the objective, it can select suitably, It is preferable that it is 3 mass%-20 mass% with respect to the said ink for inkjet recording, and 5 mass%. More preferably, it is -15 mass%. When the content is less than 3% by mass, the image density may be lowered, and when it exceeds 20% by mass, the ink viscosity is high and the cohesiveness of the colorant may be increased, resulting in unstable ejection.

<Dispersant>
The dispersant is a copolymer (hereinafter sometimes referred to as “copolymer”) containing at least styrene and acrylamide as structural units. The copolymer preferably contains a carboxyl group-containing vinyl monomer as a structural unit. The copolymer further contains other structural units as necessary.

  The proportion of the styrene and the proportion of the acrylamide as the structural unit in the copolymer is not particularly limited and can be appropriately selected depending on the purpose, but with respect to all the structural units of the copolymer, Styrene / acrylamide = 20% by mass to 80% by mass / 20% by mass to 80% by mass is preferable, 20% by mass to 60% by mass / 20% by mass to 60% by mass is more preferable, and 30% by mass to 50% by mass / 30. A mass% to 50 mass% is particularly preferred. It is advantageous in terms of image density, ejection stability, and storage stability that the proportion of styrene and the proportion of acrylamide are within the preferred ranges. The said effect becomes remarkable as it is the said especially preferable range.

-Carboxyl group-containing vinyl monomers-
Examples of the carboxyl group-containing vinyl monomers include a vinyl monomer having one carboxyl group and a vinyl monomer having two carboxyl groups. Examples of the vinyl monomer having one carboxyl group include acrylic acid and methacrylic acid. Examples of the vinyl monomer having two carboxyl groups include maleic acid, citraconic acid, itaconic acid, alkenyl succinic acid, fumaric acid, and mesaconic acid. Among these, a vinyl monomer having two carboxyl groups is preferable, itaconic acid, maleic acid, and fumaric acid are more preferable, and maleic acid is particularly preferable. The preferred embodiment is advantageous in terms of image density and storage stability. In the particularly preferred embodiment, the effect becomes remarkable.

  The proportion of the styrene as a constituent unit in the copolymer, the proportion of the acrylamide, and the proportion of the carboxyl group-containing vinyl monomers are not particularly limited and may be appropriately selected depending on the purpose. The styrene / acrylamide / carboxyl group-containing vinyl monomers = 10% by mass to 80% by mass / 10% by mass to 80% by mass / 10% by mass to 80% by mass with respect to all the structural units of the copolymer. Preferably, 20% by mass to 60% by mass / 20% by mass to 60% by mass / 20% by mass to 60% by mass are more preferable, and 25% by mass to 50% by mass / 25% by mass to 50% by mass / 25% by mass to 50% by mass. Mass% is particularly preferred. When the ratio of the styrene, the ratio of the acrylamide, and the ratio of the carboxyl group-containing vinyl monomers are within the preferable ranges, it is advantageous in terms of image density, ejection stability, and storage stability. The said effect becomes remarkable as it is the said especially preferable range.

-Other structural units-
Examples of the other structural units include (meth) acrylic acid esters, aromatic vinyl monomers, (meth) acrylamides, unsaturated group-containing polyalkylene oxides, and the like.

  Examples of the (meth) acrylic acid esters include methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, cyclohexyl (meth) acrylate, and the like. (Meth) acrylate alkyls, hydroxyethyl (meth) acrylate, hydroxypropyl (meth) acrylate, and the like.

  Examples of the aromatic vinyl monomers include α-methylstyrene and p-methylstyrene.

  Examples of the (meth) acrylamides include methacrylamide and N-methylol (meth) acrylamide.

  Examples of the unsaturated group-containing polyalkylene oxides include (meth) acrylate-terminated polyethylene glycols and (meth) acrylates in which one end of the polyalkylene oxide is an alkyl group and the other is an ethylenically unsaturated group-containing compound. Terminal polypropylene glycol, vinyl phenyl terminated polyethylene oxide, vinyl phenyl terminated polypropylene oxide, vinyl benzyl terminated polyethylene oxide, vinyl benzyl terminated polypropylene oxide, isopropenyl phenyl terminated polyethylene oxide, isopropenyl phenyl terminated polypropylene oxide, isopropenyl benzyl terminated polyethylene oxide, iso Propenylbenzyl terminated polypropylene oxide, vinyl terminated polyethylene oxide, vinyl terminated polypropylene Kishido, allyl-terminated polyethylene oxide, and the like allyl-terminated polypropylene oxide.

  As said copolymer, what was synthesize | combined suitably may be used and a commercial item may be used. Examples of the commercially available products include iodosol GH952 (manufactured by Akzo Nobel), accusol OP303P (manufactured by Rohm and Haas), and the like.

There is no restriction | limiting in particular as a synthesis method of the said copolymer, According to the objective, it can select suitably. For example, a polymerization method using a radical polymerization initiator in a solvent is preferable because the polymerization operation and the molecular weight can be easily adjusted.
Examples of the radical polymerization initiator include inorganic polymerization initiators such as ammonium persulfate, alkali metal persulfate, and hydrogen peroxide, cumene hydroperoxide, benzoyl peroxide, t-butyl peroxide, Examples thereof include organic polymerization initiators such as benzoyl oxide, azobisisobutyronitrile, and azobiscyano anodic acid. Moreover, you may use together reducing agents for redox formation, such as a transition metal salt, sulfite, and an amine compound.
Examples of the solvent include alcohol solvents such as methyl alcohol, ethyl alcohol, isopropanol, butanol, ketone solvents such as acetone and methyl ethyl ketone, cellosolv solvents such as methyl cellosolve, ethyl cellosolve, butyl cellosolve, and propylene glycol monomethyl ether, water , Etc.
In order to adjust the molecular weight of the copolymer, a suitable amount of chain transfer agent such as mercaptoacetic acid, mercaptopropionic acid, 2-propanethiol, 2-mercaptoethanol, thiophenol, dodecyl mercaptan, thioglycerol is added to the polymerization system. May be.

There is no restriction | limiting in particular as superposition | polymerization temperature in the said superposition | polymerization, According to the objective, it can select suitably, For example, 50 to 130 degreeC is mentioned.
There is no restriction | limiting in particular as superposition | polymerization time in the said superposition | polymerization, According to the objective, it can select suitably, For example, 1 hour-100 hours are mentioned.

  There is no restriction | limiting in particular as a weight average molecular weight of the said copolymer, Although it can select suitably according to the objective, 1,000-700,000 are preferable and 1,000-500,000 are more preferable.

  There is no restriction | limiting in particular as content of the said dispersing agent, According to the objective, it can select suitably, It is preferable that it is 0.02 mass%-10 mass% with respect to the said ink for inkjet recording, 0 It is more preferable that it is 0.05 mass%-5 mass%. When the content is less than 0.02% by mass, the dispersibility may be unstable and the storage stability may deteriorate, and when it exceeds 5% by mass, the viscosity may increase and the dispersibility may deteriorate. is there.

<Fluorine compound>
The fluorine compound is at least one of a fluorine compound represented by the following general formula (1) and a fluorine compound represented by the following general formula (2).
However, the general formula (1), Rf are each _{independently, CF 3, C 2 F 5} , C 3 F 7, and represent any one of _C 4 _{F 9.} M represents any of H, Li, K, Na, and NH ₄ .
However, the in general formula (2), M represents H, Li, K, Na, and one of NH _4.
In the general formula (1) and the general formula (2), the bond between N and M is a covalent bond when M is H, and M is any of Li, K, Na, and NH ₄ . In such a case, it is an ionic bond.

The C ₃ F ₇ and C ₄ F ₉ in the general formula (1) may be linear or branched.

As M in the general formula (1) and the general formula (2), Li, K, Na, and NH ₄ are preferable from the viewpoint of excellent image sharpness and storage stability.

  As the fluorine compound represented by the general formula (1) and the fluorine compound represented by the general formula (2), those appropriately synthesized may be used, or commercially available products may be used.

As a commercial item of the fluorine compound represented by the said General formula (1), EF-N301, EF-N442, EF-N443, EF-N444, EF-N445 (made by Mitsubishi Materials Electronics Chemical Co., Ltd.) etc. are mentioned, for example. It is done.
As a commercial item of the fluorine compound represented by the said General formula (2), EF-N302, EF-N303, EF-N304, EF-N305 (made by Mitsubishi Materials Electronics Chemical Co., Ltd.) etc. are mentioned, for example.

  There is no restriction | limiting in particular as content in the said inkjet recording ink of the said fluorine compound, Although it can select suitably according to the objective, 0.1 mass%-10 mass% are preferable, 0.2 mass%- 5 mass% is more preferable and 0.3 mass%-3 mass% is especially preferable. When the content is less than 0.1% by mass, the image density may be lowered and image unevenness may occur. When the content exceeds 10% by mass, the image is blurred and the storage stability is deteriorated. Sometimes. The particularly preferred range is advantageous in terms of image density, image sharpness, and storage stability.

<Water>
There is no restriction | limiting in particular as said water, According to the objective, it can select suitably, For example, pure water, such as ion-exchange water, ultrafiltration water, reverse osmosis water, distilled water, ultrapure water, etc. are mentioned. .

<Wetting agent>
The wetting agent is not particularly limited as long as it has a viscosity higher than that of water alone and decreases in the presence of moisture, and can be appropriately selected according to the purpose.
Examples of the wetting agent include ethylene glycol, diethylene glycol, 1,3-butyl glycol, 3-methyl-1,3-butyl glycol, triethylene glycol, polyethylene glycol, polypropylene glycol, 1,5-pentanediol, , 6-hexanediol, glycerin, 1,2,6-hexanetriol, polyhydric alcohols such as ethyl-1,2,4-butanetriol, 1,2,3-butanetriol, ethylene glycol monoethyl ether , Ethylene glycol monobutyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, tetraethylene glycol monomethyl ether, propylene glycol monoethyl ether Polyhydric alcohol alkyl ethers such as ethylene glycol monophenyl ether, polyhydric alcohol aryl ethers such as ethylene glycol monobenzyl ether, 2-pyrrolidone, N-methyl-2-pyrrolidone, N-hydroxyethyl-2-pyrrolidone , Nitrogen-containing heterocyclic compounds such as 1,3-dimethylimidazolidinone, ε-caprolactam, γ-butyrolactone, amides such as formamide, N-methylformamide, N, N-dimethylformamide, monoethanolamine, diethanolamine, tri Examples include amines such as ethanolamine, monoethylamine, diethylamine, and triethylamine, sulfur-containing compounds such as dimethylsulfoxide, sulfolane, and thiodiethanol, propylene carbonate, and ethylene carbonate. These may be used individually by 1 type and may use 2 or more types together.
Among these, diethylene glycol, glycerin, 2-pyrrolidone, and diethylene glycol monobutyl ether have excellent effects in terms of clogging due to drying of the ink, that is, prevention of poor jetting characteristics due to water evaporation, and improving the saturation of the formed image. Therefore, it is preferable.

  There is no restriction | limiting in particular as content of the said wetting agent, Although it can select suitably according to the objective, 10 mass%-50 mass% are preferable with respect to the said ink for inkjet recording, 5 mass%-40 mass. % Is more preferable, and 25% by mass to 35% by mass is particularly preferable. If the content is low, the storage stability and ejection stability of the ink may be deteriorated, and the nozzle may be clogged easily. If the content is too large, the drying property is deteriorated, and bleeding of characters and color boundaries may occur. May occur and image quality may deteriorate.

<Penetration agent>
The penetrant adjusts the surface tension of the ink, improves the wettability with respect to the ink jet head member and the recording device, improves the filling property, and makes it difficult for recording defects due to bubbles to occur.
The penetrant is not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include 2-ethyl-1,3-hexanediol, 2,2,4-trimethyl-1,3-pentanediol, Examples include 2,2-dimethyl-1,3-propanediol.
Among these, 2-ethyl-1,3-hexanediol and 2,2-dimethyl-1,3-propanediol are preferable. By using 2-ethyl-1,3-hexanediol and 2,2-dimethyl-1,3-propanediol, the ink penetration is increased and at the same time, the colorant is kept on the surface to eliminate bleeding, and the image density. It is possible to obtain a printed image with a high image quality and a small amount of show-through.
There is no restriction | limiting in particular as content of the said penetrant, Although it can select suitably according to the objective, 0.1 mass%-10 mass% are preferable, and 0.5 mass%-5 mass% are more preferable. . When the content is less than 0.1% by mass, the permeability is insufficient, and when it exceeds 10% by mass, the particle formation characteristics may be adversely affected.

<Other ingredients>
There is no restriction | limiting in particular as said other component, It can select suitably as needed, For example, a solvent, pH adjuster, antiseptic / antifungal agent, rust preventive agent, antioxidant, ultraviolet absorber, oxygen absorption Agents, light stabilizers and the like.

-Solvent-
There is no restriction | limiting in particular as said solvent, According to the objective, it can select suitably, For example, alcohol, such as methanol, ethanol, 1-propanol, 2-propanol, is mentioned.

-PH adjuster-
The pH adjuster is not particularly limited as long as it can adjust the pH without adversely affecting the ink jet recording ink to be prepared, and can be appropriately selected according to the purpose. And alkali metal hydroxides, ammonium hydroxides, phosphonium hydroxides, alkali metal carbonates and the like.

-Antiseptic and fungicide-
Examples of the antiseptic / antifungal agent include sodium dehydroacetate, sodium sorbate, 2-pyridinethiol-1-oxide sodium, sodium benzoate, sodium pentachlorophenol and the like.

-Antirust agent-
Examples of the rust inhibitor include acidic sulfite, sodium thiosulfate, ammonium thiodiglycolate, diisopropylammonium nitrite, pentaerythritol tetranitrate, dicyclohexylammonium nitrite, and benzotriazole.

-Antioxidant-
Examples of the antioxidant include phenol-based antioxidants (including hindered phenol-based antioxidants), amine-based antioxidants, sulfur-based antioxidants, and phosphorus-based antioxidants.

There is no restriction | limiting in particular as an average particle diameter of the said ink for inkjet recording, Although it can select suitably according to the objective, It is preferable that it is 0.02 micrometer-0.18 micrometer, 0.05 micrometer-0.15 micrometer. More preferably.
The viscosity of the inkjet recording ink is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 3 mPa · s to 20 mPa · s at 25 ° C., more preferably 5 mPa · s to 12 mPa · s. preferable.
There is no restriction | limiting in particular as static surface tension of the said ink for inkjet recording, Although it can select suitably according to the objective, 30 mN / m or less is preferable at 25 degreeC, and 25 mN / m or less is more preferable.

  The method for producing the ink for inkjet recording of the present invention is not particularly limited and can be produced by a known method. For example, after preparing a pigment dispersion containing a pigment (colorant) and a dispersant, The pigment dispersion, water, fluorine compound, wetting agent, etc. are stirred and mixed, vacuum filtration using a metal filter, membrane filter, etc., pressure filtration, centrifugal filtration using a centrifuge, coarse particles, foreign matter (dust) , Dust) and the like, and deaeration as necessary.

The preparation of the pigment dispersion is not particularly limited and may be appropriately selected depending on the purpose. For example, a colorant, a dispersant, water, and various additives as necessary may be added to a bead mill (for example, dyno mill KDL type). (Shinmaru Enterprises Co., Ltd.), agitator mill LMZ (Ashizawa Finetech Co., Ltd.), SC mill (Mitsui Mining Co., Ltd.), etc., and further dispersion in the bead mill followed by a beadless mill (for example, high-speed shearing) Force type CLEAR SS5 (manufactured by M Technique), Cavitron CD1010 (manufactured by Eurotech), module DR2000 (manufactured by Shinmaru Enterprises), thin-film swivel type TK Philmix (manufactured by Special Machine Industries) ), Ultra High Pressure Collision Type Althemizer (manufactured by Sugino Machine), Nanomizer (Yoshida Kikai Kogyo Co., Ltd.) Etc.), etc.).
In addition, pretreatment of coarse particles with a homogenizer or the like before dispersion with the bead mill is preferable in that the particle size distribution can be made sharper and the image density, ejection stability and the like are improved.
There is no restriction | limiting in particular as a bead used for the said bead mill, According to the objective, it can select suitably, For example, a ceramic bead is mentioned. Examples of the ceramic beads include zirconia beads. There is no restriction | limiting in particular as a bead diameter of the said ceramic bead, Although it can select suitably according to the objective, 0.05 mm or less in diameter is preferable and 0.03 mm or less in diameter is more preferable.

  The stirring and mixing method is not particularly limited and may be appropriately selected depending on the intended purpose. For example, the stirring and mixing method may be performed with a stirrer using a normal stirring blade, a magnetic stirrer, a high-speed disperser, or the like.

  The ink for ink jet recording of the present invention can be suitably used for an ink cartridge that contains the ink as described later. In addition, as described later, the ink for ink jet recording of the present invention can form an image by an ink jet recording apparatus ejected onto a recording medium such as paper.

(ink cartridge)
The ink cartridge of the present invention comprises the ink jet recording ink contained in a container.
The shape, structure, size, and material of the container are not particularly limited and can be appropriately selected depending on the purpose.For example, the container having at least an ink bag formed of an aluminum laminate film, a resin film, A plastic case is preferable.

  The ink cartridge contains the ink for ink jet recording and can be used by being detachably attached to various ink jet recording apparatuses. Further, it is preferably used by being detachably mounted on the ink jet recording apparatus of the present invention described later.

(Inkjet recording apparatus and inkjet recording method)
The ink jet recording apparatus of the present invention has at least ink ejecting means for recording an image by applying a stimulus to the ink for ink jet recording and causing the ink to eject, and further includes other means as necessary.
The ink jet recording method of the present invention includes at least an ink flying step of applying an stimulus to the ink jet recording ink of the present invention and causing the ink to fly to record an image, and further includes other steps as necessary. .
In the ink jet recording method of the present invention, the ink flying step can be performed by the ink flying means.

<Ink flying means and ink flying process>
The ink flying means is means for applying a stimulus to the ink jet recording ink and causing the recording ink to fly to form an image.
The ink flying step is a step of forming an image by applying a stimulus to the ink jet recording ink and causing the recording ink to fly.

Examples of the ink flying means include a continuous ejection type and an on-demand type. Examples of the on-demand type include a piezo method, a thermal method, and an electrostatic method. Among these, the piezo method and the thermal method are preferable.
In the piezo method, a piezoelectric element is used as a pressure generating means for pressurizing ink in the ink flow path, and a diaphragm that forms the wall surface of the ink flow path is deformed to change the volume in the ink flow path to eject ink droplets. (See Japanese Patent Application Laid-Open No. 2-51734).
In the thermal method, a heating resistor is used to heat ink in an ink flow path to generate bubbles and eject ink droplets (see JP-A-61-59911).
In the electrostatic method, the diaphragm and the electrode that form the wall surface of the ink flow path are arranged opposite to each other, and the diaphragm is deformed by an electrostatic force generated between the diaphragm and the electrode, whereby the ink flow path volume is increased. Ink droplets are ejected by changing (see Japanese Patent Laid-Open No. 6-71882).

  The stimulus can be generated by, for example, a stimulus generating means, and the stimulus is not particularly limited and can be appropriately selected according to the purpose, such as heat (temperature), pressure, vibration, light, etc. Is mentioned. These may be used individually by 1 type and may use 2 or more types together. Among these, heat and pressure are preferable.

  Examples of the stimulus generating means include a heating device, a pressurizing device, a piezoelectric element, a vibration generating device, an ultrasonic oscillator, a light, and the like. Specifically, a piezoelectric actuator such as a piezoelectric element, a thermal actuator that uses a phase change caused by film boiling of a liquid using an electrothermal transducer such as a heating resistor, a shape memory alloy actuator that uses a metal phase change caused by a temperature change, For example, an electrostatic actuator using an electrostatic force may be used.

  There is no particular limitation on the manner of flying the ink jet recording ink, and it varies depending on the type of the stimulus. For example, when the stimulus is “heat”, recording is performed on the ink jet recording ink in the recording head. Thermal energy corresponding to the signal is applied using, for example, a thermal head, bubbles are generated in the inkjet recording ink by the thermal energy, and the inkjet recording ink is generated from the nozzle holes of the recording head by the pressure of the bubbles. And the like. Further, when the stimulus is “pressure”, for example, by applying a voltage to a piezoelectric element bonded to a position called a pressure chamber in an ink flow path in the recording head, the piezoelectric element bends and the volume of the pressure chamber is increased. And a method of ejecting and ejecting the ink jet recording ink as droplets from the nozzle holes of the recording head.

  When an image is recorded on a recording medium using the ink jet recording apparatus containing the ink for ink jet recording, an ink recorded matter is obtained on the recording medium on demand. Further, the replenishment of ink for ink jet recording can be replaced in units of ink cartridges.

Here, the ink cartridge and the ink jet recording apparatus of the present invention will be described with reference to FIG.
In FIG. 1, the ink cartridge 20 in which the ink jet recording ink of the present invention is accommodated is accommodated in a carriage 18. Here, a plurality of ink cartridges 20 are provided for convenience, but it is not necessary to have a plurality. In such a state, the ink for ink jet recording is supplied from the ink cartridge 20 to the droplet discharge head 18 a mounted on the carriage 18. In FIG. 1, the discharge nozzle surface is in an invisible state because it faces downward, but ink jet recording ink is discharged from this discharge nozzle.
The droplet discharge head 18 a mounted on the carriage 18 moves while being guided by guide shafts 21 and 22 by a timing belt 23 driven by a main scanning motor 24. On the other hand, a specific coated paper (image support) is placed at a position facing the droplet discharge head 18 a by the platen 19. In FIG. 1, 1 is an ink jet recording apparatus, 2 is a main body housing, 16 is a gear mechanism, 17 is a sub-scanning motor, 25 and 27 are gear mechanisms, and 26 is a main scanning motor.

(Ink record)
The ink recorded matter of the present invention has an image formed on a recording medium using the ink for ink jet recording.

The recording medium is not particularly limited and may be appropriately selected depending on the intended purpose. For example, the recording medium may be any one that has an absorptivity with respect to ink such as paper or a substantially non-absorbent with respect to ink. However, it is preferably used.
Examples of the recording medium include plastic sheets based on polyethylene terephthalate, polycarbonate, polypropylene, polyethylene, polysulfone, ABS resin, polyvinyl chloride, and the like; metal surfaces such as brass, iron, aluminum, SUS, copper, or nonmetals Recording media that have been subjected to metal coating treatment by a technique such as vapor deposition on a base material; recording media that have been subjected to water-repellent treatment using paper as a base material; recording media that are made of a so-called ceramic material obtained by firing an inorganic material at a high temperature, etc. Can be mentioned. Among these, paper is particularly preferable from the viewpoint of economy and the naturalness of images.

Examples of the present invention will be described below, but the present invention is not limited to the following examples.

(Preparation Example 1)
<Preparation of pigment dispersion A>
After premixing a mixture having the following composition, using a bead mill disperser (manufactured by Kotobuki Industries Co., Ltd., UAM-015), zirconia beads having a diameter of 0.03 mm (density 6.03 × 10 ⁻⁶ g / m ³ ) and a peripheral speed of 10 m / S, after dispersion at a liquid temperature of 30 ° C. for 15 minutes, the coarse particles were centrifuged with a centrifuge (Model 3600, manufactured by Kubota Corporation), and the average particle size of the carbon black dispersion was 129.6 nm. A pigment dispersion A having a standard deviation of 45.8 nm was prepared.
The average particle size and standard deviation were measured with Microtrac UPA150 (manufactured by Nikkiso Co., Ltd.).
-Composition-
Carbon black (NIPEX150-IQ, manufactured by Degussa, gas black) 15 parts by mass Styrene-acrylamide copolymer aqueous solution (manufactured by Akzo Nobel, Yodosol GH952, solid concentration 40% by mass) 2 parts by mass NaOH aqueous solution (NaOH concentration 20% by mass): 0.8 parts by mass Distilled water: 82.2 parts by mass

(Preparation Example 2)
<Preparation of pigment dispersion B>
In Preparation Example 1, the amount of the styrene-acrylamide copolymer aqueous solution (manufactured by Akzo Nobel, Yodosol GH952, solid concentration 40% by mass) was changed to 18 parts by mass, and the amount of distilled water was changed to 66.2 parts by mass. Except for the above, pigment dispersion B was prepared in the same manner as in Preparation Example 1.

(Preparation Example 3)
<Preparation of pigment dispersion C>
In Preparation Example 1, the amount of styrene-acrylamide copolymer aqueous solution (Akzo Nobel, Yodosol GH952, solid concentration 40% by mass) was changed to 37 parts by mass, and the amount of distilled water was changed to 47.2 parts by mass. Except for the above, a pigment dispersion C was prepared in the same manner as in Preparation Example 1.

(Preparation Example 4)
<Preparation of pigment dispersion D>
In Preparation Example 1, carbon black was changed to C.I. I. Pigment dispersion D was prepared in the same manner as in Preparation Example 1, except that it was replaced with Pigment Yellow 138 (Toyo Ink Manufacturing Co., Ltd., LIONOGEN YELLOW 1010).

(Preparation Example 5)
<Preparation of pigment dispersion E>
In Preparation Example 1, carbon black was changed to C.I. I. Pigment dispersion E was prepared in the same manner as Preparation Example 1, except that it was replaced with CI Pigment Red 122 (manufactured by Clariant, Toner Magenta E02).

(Preparation Example 6)
<Preparation of pigment dispersion F>
In Preparation Example 1, carbon black was changed to C.I. I. Pigment dispersion liquid F was prepared in the same manner as in Preparation Example 1, except that it was changed to CI Pigment Blue 15: 3 (manufactured by Toyo Ink Manufacturing Co., Ltd., LIONOL BLUE FG-7351).

(Preparation Example 7)
<Preparation of pigment dispersion G>
In Preparation Example 1, an aqueous solution of styrene-acrylamide copolymer (manufactured by Akzo Nobel, Yodosol GH952, solid concentration 40% by mass) was replaced with an aqueous solution of styrene-maleic acid-acrylamide sodium (solid concentration 40% by mass) prepared by the following method. A pigment dispersion G was prepared in the same manner as in Preparation Example 1, except that
-Preparation of aqueous solution of styrene-maleic acid-sodium acrylamide-
A four-necked flask equipped with a thermometer, stirrer, and reflux condenser and charged with 500 g of water and 15 g of aninium persulfate containing 100 g of styrene and a carboxyl group as an aromatic monomer under heating conditions of 80 ° C. to 90 ° C. 130 g of maleic acid as a vinyl monomer and 140 g of a 50% acrylamide aqueous solution are slowly added dropwise with stirring, followed by reaction for 4 hours, followed by cooling and neutralization using NaOH as a neutralizing alkali, distilled water Was added to adjust the solid content to 40% by mass to obtain an aqueous styrene-maleic acid-sodium acrylamide solution.

(Preparation Example 8)
<Preparation of pigment dispersion H>
Preparation Example 2 except that the aqueous styrene-acrylamide copolymer solution (manufactured by Akzo Nobel, Yodosol GH952, solid concentration 40% by mass) was replaced with the aqueous styrene-maleic acid-sodium acrylamide solution (solid content 40% by mass). In the same manner as in Example 2, a pigment dispersion H was prepared.

(Preparation Example 9)
<Preparation of pigment dispersion I>
Preparation Example 3 except that the aqueous solution of styrene-acrylamide copolymer (manufactured by Akzo Nobel, Yodosol GH952, solid concentration 40% by mass) was replaced with an aqueous solution of styrene-maleic acid-sodium acrylamide (solid content 40% by mass). In the same manner as in Example 3, pigment dispersion I was prepared.

(Preparation Example 10)
<Preparation of pigment dispersion J>
Preparation Example 1 except that the aqueous styrene-acrylamide copolymer solution (Akzo Nobel, Yodosol GH952, solid concentration 40% by mass) was replaced with dilauroylglutamate lysine Na (Asahi Kasei Chemicals, Perisea L-30). In the same manner as in Example 1, a pigment dispersion J was prepared.

(Preparation Example 11)
<Preparation of pigment dispersion K>
In Preparation Example 1, a styrene-acrylamide copolymer aqueous solution (manufactured by Akzo Nobel, Yodosol GH952, solid concentration 40% by mass) was mixed with an anionic surfactant (Takemoto Yushi Co., Ltd., Pionine A-45-PN, naphthalenesulfonate formalin condensate). A pigment dispersion K was prepared in the same manner as in Preparation Example 1, except that it was replaced with Na salt.

(Preparation Example 12)
<Preparation of pigment dispersion L>
In Preparation Example 1, a styrene-acrylamide copolymer aqueous solution (manufactured by Akzo Nobel, Yodosol GH952, solid concentration 40% by mass) was added to polyvinylpyrrolidone (weight average molecular weight 45,000, manufactured by Daiichi Kogyo Seiyaku Co., Ltd., Vitzkor K30). A pigment dispersion L was prepared in the same manner as in Preparation Example 1, except that it was replaced.

(Preparation Example 13)
<Preparation of pigment dispersion M>
In Preparation Example 1, an aqueous styrene-acrylamide copolymer solution (Akzo Nobel, Yodosol GH952, solid concentration 40% by mass) is replaced with polyoxyethylene alkyl ether phosphate ester (Daiichi Kogyo Seiyaku Co., Ltd., Prisurf A219B). A pigment dispersion M was prepared in the same manner as in Preparation Example 1, except that

(Preparation Example 14)
<Preparation of pigment dispersion N>
In Preparation Example 1, a styrene-acrylamide copolymer aqueous solution (manufactured by Akzo Nobel, Yodosol GH952, solid concentration 40% by mass) was mixed with an anionic surfactant (Daiichi Kogyo Seiyaku Co., Ltd., Hytenol 18E, polyoxyethylene alkyl ether). A pigment dispersion N was prepared in the same manner as in Preparation Example 1, except that the sulfate was replaced.

(Preparation Example 15)
<Preparation of pigment dispersion O>
In Preparation Example 4, except that the styrene-acrylamide copolymer aqueous solution (manufactured by Akzo Nobel, Yodosol GH952, solid concentration 40% by mass) was replaced with polyoxyethylene naphthyl ether (manufactured by Takemoto Yushi Co., Ltd., Pionin D-7240), In the same manner as in Preparation Example 4, a pigment dispersion O was prepared.

(Preparation Example 16)
<Preparation of pigment dispersion P>
In Preparation Example 5, except that the styrene-acrylamide copolymer aqueous solution (manufactured by Akzo Nobel, Yodosol GH952, solid concentration 40% by mass) was replaced with polyoxyethylene naphthyl ether (manufactured by Takemoto Yushi Co., Ltd., Pionin D-7240), In the same manner as in Preparation Example 5, a pigment dispersion P was prepared.

(Preparation Example 17)
<Preparation of pigment dispersion Q>
In Preparation Example 6, except that the styrene-acrylamide copolymer aqueous solution (manufactured by Akzo Nobel, Yodosol GH952, solid concentration 40% by mass) was replaced with polyoxyethylene naphthyl ether (manufactured by Takemoto Yushi Co., Ltd., Pionine D-7240), In the same manner as in Preparation Example 6, pigment dispersion Q was prepared.

Example 1
<Preparation of ink 1>
The following ink formulation was stirred for 30 minutes, then filtered through a membrane filter having a pore size of 0.8 μm, and vacuum degassed to produce ink 1.
-Ink formula-
Pigment dispersion A (pigment concentration: 15% by mass): 40.0 parts by mass Glycerin: 15.0 parts by mass Diethylene glycol: 15.0 parts by mass Fluorine compound represented by the following structural formula A-1: 0.5 parts by mass-2-ethyl-1,3-hexanediol ... 3.0 parts by mass-2-pyrrolidone ... 3.0 parts by mass-Polyoxyethylene (3) alkyl (C13) Sodium ether acetate (manufactured by Nikko Chemical Co., ECTD-3NEX) 0.45 parts by mass Distilled water 23.05 parts by mass
Here, in the above structural formulas, all Rf are C ₄ F ₉ . In addition, EF-N442 (made by Mitsubishi Materials Electronics Chemical Co., Ltd.) was used as the fluorine compound A-1.

<Evaluation>
About the produced ink, it printed on the PPC paper 4024 made from Xerox Co., Ltd. using the gel jet printer IPSiO GX5000 made from Ricoh, and image density, image sharpness, and discharge stability were evaluated as follows. The results are shown in Table 1-1.
Further, the storage stability of the produced ink was evaluated as follows. The results are shown in Table 1-1.

-Image density-
The image density was evaluated by measuring the color measurement of a solid image of an image sample prepared with ink with an Xrite densitometer 938 and using the following criteria.
〔Evaluation criteria〕
A: 1.31-1.40
○: 1.21 to 1.30
Δ: 1.11 to 1.20
X: 1.01-1.10

-Image sharpness-
The image sharpness was evaluated based on the following criteria by visually observing the sharpness of the printed character portion.
〔Evaluation criteria〕
◎: Extremely good ○: Good △: Normal ×: Poor The sharp character portion means that there is no blurring of the character and the edge of the character portion is sharp.

−Discharge stability−
With respect to ejection stability, after printing a printed matter with ink, the printer was left in a 40 ° C. environment for one month with the printer head capped. Whether or not the discharge state of the printer after being left is restored to the initial discharge state was evaluated based on the following evaluation criteria for the number of cleaning operations.
〔Evaluation criteria〕
○: Recovered by one operation.
Δ: Recovered by 2 to 3 operations.
X: No recovery was observed even after three or more operations.

-Storage stability-
After the ink was sealed in a polyethylene container and stored at 70 ° C. for 3 weeks, the average particle diameter of the ink, the surface tension of the ink, and the viscosity of the ink were measured, and evaluated according to the following criteria based on the rate of change from the initial physical properties. .
The average particle size of the ink is Microtrack EX150 manufactured by Nikkiso Co., Ltd., the surface tension of the ink is a fully automatic surface tension meter CBVP-Z manufactured by Kyowa Interface Science Co., Ltd., and the viscosity of the ink is 25 ° C. manufactured by Toki Sangyo Co., Ltd. Each was measured with a RE500L viscometer.
〔Evaluation criteria〕
A: Less than 5% (all items of average particle diameter, surface tension, and viscosity of ink)
○: Less than 10% (all items of average particle diameter, surface tension, and viscosity of ink)
Δ: Less than 30% (all items of average particle diameter, surface tension and viscosity of ink)
X: 30% or more (at least one item of average particle diameter, surface tension, and viscosity of ink)

(Examples 2-34, 37-40, and Comparative Examples 1-34)
In Example 1, the type of pigment dispersion and the type and blending amount of the fluorine compound were replaced with the types of pigment dispersion and the type and blending amount of the fluorine compound described in Table 1-1 and Table 1-2. Except for the above, inks of Examples 2-34, 37-40, and Comparative Examples 1-34 were prepared in the same manner as Example 1.
The structures of fluorine compounds A-2 to A-9 and fluorine compound B are as follows.
Each manufactured ink was evaluated in the same manner as in Example 1. The evaluation results are shown in Table 1-1 and Table 1-2.
Here, in the above structural formulas, all Rf are C ₄ F ₉ . In addition, EF-N443 (made by Mitsubishi Materials Electronics Kasei Co., Ltd.) was used as the fluorine compound A-2.
Here, in the above structural formulas, all Rf are C ₄ F ₉ . Note that EF-N445 (manufactured by Mitsubishi Materials Electronics Chemical Co., Ltd.) was used as the fluorine compound A-3.
Here, in the above structural formulas, all Rf are C ₄ F ₉ . In addition, EF-N444 (Mitsubishi Materials Electronics Kasei Co., Ltd.) was used as the fluorine compound A-4.
In addition, as fluorine compound A-5, EF-N302 (made by Mitsubishi Materials Electronics Chemical Co., Ltd.) was used.
In addition, EF-N303 (Mitsubishi Materials Electronics Kasei Co., Ltd.) was used as the fluorine compound A-6.
In addition, EF-N305 (Mitsubishi Materials Electronics Kasei Co., Ltd.) was used as the fluorine compound A-7.
In addition, EF-N304 (Mitsubishi Materials Electronics Kasei Co., Ltd.) was used as the fluorine compound A-8.
Here, in the above structural formulas, all Rf are C ₄ F ₉ . In addition, EF-N301 (Mitsubishi Materials Electronics Kasei Co., Ltd.) was used as the fluorine compound A-9.

Fluorine compound B: fluorinated surfactant represented by the following general formula (3) (manufactured by DuPont, FS-300)
However, in the general formula (3), m = 6 to 8, and n = 26 or more.

(Example 35)
Ink of Example 35 was produced in the same manner as in Example 1 except that diethylene glycol was replaced with diethylene glycol monobutyl ether in Example 1.
The produced ink was evaluated in the same manner as in Example 1. The evaluation results are shown in Table 1-1.

(Example 36)
Ink of Example 36 was prepared in the same manner as in Example 1 except that 2-ethyl-1,3-hexanediol was replaced with 2,2-dimethyl-1,3-propanediol in Example 1. .
The produced ink was evaluated in the same manner as in Example 1. The evaluation results are shown in Table 1-1.

  The ink for ink jet recording of the present invention can be applied to various recordings by an ink jet recording method, and can be suitably applied to, for example, an ink jet printer, a facsimile machine, a copying machine, and the like.

DESCRIPTION OF SYMBOLS 1 Inkjet recording device 2 Main body housing | casing 16 Gear mechanism 17 Subscanning motor 18 Carriage 18a Droplet discharge head 19 Platen 20 Ink cartridge 21 Guide shaft 22 Guide shaft 23 Timing belt 24 Main scanning motor 25 Gear mechanism 26 Main scanning motor 27 Gear mechanism

Japanese Patent Laid-Open No. 2006-8858 Japanese Patent Laid-Open No. 2002-3767 JP 2006-219484 A JP 2004-123904 A JP-A-5-239392 JP-A-8-283633 JP 2000-63727 A JP 2001-81366 A Special table 2003-509571 gazette JP-A-08-333531 Japanese Patent Laid-Open No. 56-147871 US Pat. No. 5,085,698 US Pat. No. 5,221,334 US Pat. No. 5,172,133 JP 2000-144028 A US Pat. No. 5,571,311 JP-A-8-81646 JP-A-8-3498 JP-A-9-194775 Japanese Patent Application Laid-Open No. 2005-281691 JP 2005-314528 A JP 2006-188626 A Japanese Patent No. 3625595 Japanese Patent Publication No. 01-15542 Japanese Patent Application Laid-Open No. 08-41394 JP 2009-241586 A JP 2009-1741 A

Claims (9)

An inkjet recording ink comprising a colorant, a dispersant, a fluorine compound, water, and a wetting agent,
The dispersant is a copolymer containing at least styrene and acrylamide as structural units,
The fluorine compound-jet recording ink, characterized in that at least one be a fluorine compound represented by the fluorine compound and the following general formula represented by the following general formula (1) (2).
However, the general formula (1), Rf are each _{independently, C 2 F 5, C 3} F 7, and represent any one of _C 4 _{F 9.} M represents any of H, Li, K, Na, and NH ₄ .
However, the in general formula (2), M represents H, Li, K, Na, and one of NH _4.   The ink for inkjet recording according to claim 1, wherein the content of the fluorine compound is 0.1 mass% to 10 mass%.   The ink for inkjet recording according to any one of claims 1 to 2, wherein the wetting agent is at least one selected from diethylene glycol, glycerin, 2-pyrrolidone, and diethylene glycol monobutyl ether. Furthermore, the ink jet according to any one of claims 1 to 3 containing either 2-ethyl-1,3-hexanediol as a penetrant, and 2,2-dimethyl-1,3-also less propanediol Recording ink.   The ink for inkjet recording according to any one of claims 1 to 4, wherein the dispersant is a copolymer containing styrene, acrylamide and maleic acid as structural units.   An ink cartridge comprising the ink jet recording ink according to claim 1 contained in a container.   An ink jet recording apparatus comprising at least ink flying means for recording an image by applying a stimulus to the ink for ink jet recording according to claim 1 and causing the ink to fly.   6. An ink jet recording method comprising at least an ink flying step of recording an image by applying a stimulus to the ink for ink jet recording according to claim 1 and causing the ink to fly.   An ink recorded matter comprising an image formed using the ink for ink jet recording according to any one of claims 1 to 5 on a recording medium.