Classifications

• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
  • C09D11/00—Inks
  • C09D11/30—Inkjet printing inks
  • C09D11/32—Inkjet printing inks characterised by colouring agents
  • C09D11/322—Pigment inks
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
  • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
  • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
  • B41J2/01—Ink jet
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
  • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
  • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
  • B41J2/01—Ink jet
  • B41J2/21—Ink jet for multi-colour printing
  • B41J2/2107—Ink jet for multi-colour printing characterised by the ink properties
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
  • C09D11/00—Inks
  • C09D11/30—Inkjet printing inks
  • C09D11/32—Inkjet printing inks characterised by colouring agents
  • C09D11/328—Inkjet printing inks characterised by colouring agents characterised by dyes
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
  • C09D11/00—Inks
  • C09D11/30—Inkjet printing inks
  • C09D11/38—Inkjet printing inks characterised by non-macromolecular additives other than solvents, pigments or dyes
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
  • C09D11/00—Inks
  • C09D11/30—Inkjet printing inks
  • C09D11/40—Ink-sets specially adapted for multi-colour inkjet printing
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
  • C09D11/00—Inks
  • C09D11/54—Inks based on two liquids, one liquid being the ink, the other liquid being a reaction solution, a fixer or a treatment solution for the ink

Definitions

• the present invention relates to inkjet inks, ink sets, ink media sets, and printing media.
• a printing method using an inkjet printer which is one of the representative methods among color printing methods, generates small droplets of ink and attaches them to printing media such as paper to record.
• inkjet printing method has been applied to industrial applications, and is required to be compatible with various printing media.
• non-ink-absorbing media represented by films.
• solvent inks using organic solvents as main solvents solvent inks using organic solvents as main solvents
• curable inks containing polymerizable monomers, and the like have been developed.
• these inks have many safety problems against the natural environment and living organisms, and their applications are limited. Therefore, in recent years, water-based inks using water as a main solvent have been actively developed (see Patent Documents 1 to 3, for example).
• Patent Documents 1 to 3 have insufficient wettability to non-ink-absorbing media such as PET (polyethylene terephthalate) films and PP (polypropylene) films.
• the logP value of the water-soluble organic solvent is less than 1.258
• a mixture obtained by mixing 1 part by mass of the organic compound, 9 parts by mass of 1,4-butanediol, and 90 parts by mass of purified water is brought into contact with an OPP (biaxially oriented polypropylene) film; and When the interfacial tension at 25 ° C.
• the interfacial tension of the organic compound against OPP is less than 20.7 mN / m
• the value obtained by (B)/(A) is 0. 01 to 0.50
• the water-soluble organic solvent contains at least one selected from the group consisting of a compound represented by the following formula (1), a compound represented by the following formula (2), a propylene glycol alkyl ether, and a diethylene glycol alkyl ether. , 1) to 3).
• R 1 represents a linear or branched C4-C6 hydrocarbon group.
• R2 represents a hydrogen atom or a methyl group.
• the water-soluble organic solvent is selected from the group consisting of 1,5-pentanediol, 1,4-butanediol, 1,6-hexanediol, propylene glycol monopropyl ether, diethylene glycol alkyl ether, and 3-methoxy-1-butanol.
• the inkjet ink according to 4 which contains at least one selected type.
• the organic compound comprises at least one selected from the group consisting of polyoxyalkylene alkyl ethers, polyoxyalkylene aryl ethers, polyoxyethylene alkyl sulfate esters, and acetylene glycol-based surfactants.
• the organic compound comprises at least one selected from the group consisting of polyoxyalkylene alkyl ethers, polyoxyalkylene aryl ethers, polyoxyethylene alkyl sulfate esters, and acetylene glycol-based surfactants.
• the organic compound contains at least one selected from the group consisting of polyoxyethylene naphthyl ether, polyoxyalkylene-2-ethylhexyl ether, polyoxyethylene lauryl sulfate, and acetylene glycol-based surfactants; The ink jet ink described.
• An ink set comprising the inkjet ink according to any one of 1) to 7) and another inkjet ink different from the inkjet ink.
• An ink media set comprising the inkjet ink according to any one of 1) to 7) or the ink set according to 8) and a printing medium.
• an inkjet ink having good wettability to a non-ink-absorbing medium, an ink set comprising the inkjet ink, an ink media set comprising the inkjet ink or the ink set and a printing medium, and the inkjet
• the print media can be provided with each inkjet ink of the inkjet ink or ink set.
• C.I means "color index.”
• alkylene alkylene
• propylene alkyl
• the inkjet ink according to the present embodiment (hereinafter also simply referred to as "ink”) is an inkjet ink containing a pigment, a water-soluble organic solvent, and an organic compound (excluding the pigment and the water-soluble organic solvent). , wherein the logP value of the water-soluble organic solvent is less than 1.258, and 1 part by mass of the organic compound, 9 parts by mass of 1,4-butanediol, and 90 parts by mass of purified water are mixed.
• the interfacial tension at 25 ° C.
• the OPP interfacial tension of the organic compound the organic
• the organic The compound has an interfacial tension against OPP of less than 20.7 mN/m, and the total mass of the water-soluble organic solvent contained in the ink according to the present embodiment is (A), and the total mass of the organic compound is (B).
• the value obtained by (B)/(A) is 0.01 to 0.50, and the surface tension at 25° C. is less than 33.7 mN/m.
• the surface tension of the ink according to this embodiment at 25°C is preferably 25.0 to 33.7 mN/m, more preferably 28.0 to 32.8 mN/m.
• the ink according to this embodiment preferably does not contain a silicone-based surfactant.
• a silicone-based surfactant refers to a surfactant having a siloxane bond (--Si--O--Si--) in its molecule.
• each component demonstrated below may be used individually by 1 type of them, and may use 2 or more types together.
• Pigments include inorganic pigments, organic pigments, extender pigments, hollow particles, and the like.
• inorganic pigments include carbon black, metal oxides, metal hydroxides, metal sulfides, metal ferrocyanides, and metal chlorides.
• the inorganic pigments contained in the black ink include thermal black, acetylene black, oil furnace black, gas furnace black, lamp black, Carbon blacks such as gas black and channel black are preferred.
• Specific examples of carbon black include, for example, Raven series manufactured by Columbia Carbon; Monarch series, Regal series, and Mogul series manufactured by Cabot Corporation; ColorBlack series, Printex series, and SpecialBlack series manufactured by Orion Engineered Carbons; and Nerox series; Mitsubishi Chemical Corporation MA series, MCF series, No. 25, No. 33, No. 40, No. 47, No. 52, No. 900, and No. 2300;
• the inorganic pigment contained in the white ink includes oxides of metals such as zinc, silicon, aluminum, titanium, strontium, and zirconium. , nitrides, or oxynitrides; inorganic compounds such as glass and silica; Among these, titanium dioxide and zinc oxide are preferred.
• organic pigments examples include various pigments such as azo, disazo, phthalocyanine, quinacridone, isoindolinone, dioxazine, perylene, perinone, thioindigo, anthraquinone, and quinophthalone.
• disazo pigments are preferred.
• organic pigments 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, 155, 180, 185, 193, 199, 202, 213; I. Pigment Red 5, 7, 12, 48, 48: 1, 57, 88, 112, 122, 123, 146, 149, 150, 166, 168, 177, 178, 179, 184, 185, 202, 206, 207, 254, 255, 257, 260, 264, 269, 272; C.I. I.
• Pigment Blue 1 2, 3, 15, 15:1, 15:2, 15:3, 15:4, 15:6, 16, 22, 25, 60, 66, 80, and other blue pigments; I. Pigment Violet 19, 23, 29, 37, 38, 50 and other violet pigments; C.I. I. Pigment Orange 13, 16, 43, 68, 69, 71, 73 and other orange pigments; C.I. I. Pigment Green 7, 36, 54 and other green pigments; C.I. I. Black pigments such as Pigment Black 1; Among these, C.I. I. Pigment Blue 15:4 is preferred.
• extender pigments examples include silica, calcium carbonate, talc, clay, barium sulfate, and white carbon. Extender pigments are often used in combination with other pigments.
• Hollow particles are described in, for example, US Pat. No. 4,880,465, US Pat. No. 3,562,754, US Pat.
• Known hollow particles can be used, and it is particularly preferable to use them as white pigments.
• the average particle size of the pigment is preferably 30-300 nm, more preferably 50-250 nm.
• the average particle size refers to the average particle size of particles measured using a laser light scattering method.
• the pigment content is preferably 1 to 30% by mass, more preferably 1 to 10% by mass, and 2 to 8% by mass with respect to the total mass of the ink according to the present embodiment. is more preferred.
• the water-soluble organic solvent is not particularly limited as long as it has a logP value of less than 1.258.
• the logP value refers to the octanol/water partition coefficient, and higher numbers mean higher hydrophobicity.
• the logP value is obtained, for example, using ChemDraw Professional ver. It can be represented by the numerical value of "ClogP" obtained by calculation using 16.0.
• the logP value of the water-soluble organic solvent is preferably greater than -5.420 and less than 1.258.
• water-soluble organic solvents having a logP value of less than 1.258 include C1-C6 alkanols such as methanol, ethanol, propanol, isopropanol, butanol, isobutanol, sec-butanol, tert-butanol; N,N-dimethyl carboxylic acid amides such as formamide and N,N-dimethylacetamide; lactams such as 2-pyrrolidone, N-methyl-2-pyrrolidone and N-methylpyrrolidin-2-one; 1,3-dimethylimidazolidin-2-one, cyclic ureas such as 1,3-dimethylhexahydropyrimid-2-one; acetone, 2-methyl-2-hydroxypentan-4-one, ketones such as ethylene carbonate, ketoalcohols, or carbonates; tetrahydrofuran, dioxane cyclic ethers such as ethylene glycol, diethylene glycol, 1,
• water-soluble organic solvent compounds represented by the following formula (1), compounds represented by the following formula (2), propylene glycol alkyl ethers, and diethylene glycol alkyl ethers are preferable.
• R 1 represents a linear or branched C4-C6 hydrocarbon group.
• Preferred compounds represented by formula (1) are 1,4-butanediol, 1,5-pentanediol, and 1,6-hexanediol.
• R 2 represents a hydrogen atom or a methyl group.
• 3-methoxy-1-butanol and 3-methoxy-3-methyl-1-butanol are preferred.
• Propylene glycol alkyl ethers include, for example, propylene glycol monoalkyl ethers such as propylene glycol monopropyl ether and propylene glycol monobutyl ether; propylene glycol dialkyl ethers such as propylene glycol diethyl ether; and the like.
• diethylene glycol alkyl ethers examples include diethylene glycol monoalkyl ethers such as diethylene glycol monobutyl ether, diethylene glycol monoethyl ether and diethylene glycol monomethyl ether; diethylene glycol dialkyl ethers such as diethylene glycol dimethyl ether and diethylene glycol butyl methyl ether; and the like.
• water-soluble organic solvents include 1,5-pentanediol, 1,4-butanediol, 1,6-hexanediol, propylene glycol monopropyl ether, diethylene glycol alkyl ether, and 3-methoxy-1-butanol. It preferably contains at least one selected from the group consisting of 1,5-pentanediol, 1,4-butanediol, propylene glycol monopropyl ether, diethylene glycol butyl methyl ether, and 3-methoxy-1-butanol It is preferable to include at least one more selected one.
• These water-soluble organic solvents are compounds with a balance of hydrophilicity and hydrophobicity, and have the property of being soluble in both the water contained in the ink and the above organic compounds. Due to this property, it is possible to stably dissolve the above organic compound even in water-based ink in which water accounts for most of the total mass of the ink, and it is possible to prevent the ink from causing phase separation. it is conceivable that.
• the content of the water-soluble organic solvent is preferably 1 to 20% by mass, more preferably 1 to 15% by mass, and more preferably 1 to 10% by mass with respect to the total mass of the ink according to the present embodiment. is more preferable, and 3 to 7% by mass is particularly preferable.
• interfacial tension against OPP As the organic compound, one having an interfacial tension against OPP of less than 20.7 mN/m is used.
• the interfacial tension of the organic compound against OPP is preferably 19 mN/m or less, more preferably 18 mN/m or less.
• the term "interfacial tension against OPP" as used herein refers to a mixture of an organic compound (1 part by mass), 1,4-butanediol (9 parts by mass) and purified water (90 parts by mass) on an OPP film. It means the interfacial tension at 25° C. between the mixed liquid and the OPP film when they are brought into contact, and can be calculated from the contact angle of the mixed liquid with respect to the OPP film using Young's formula.
• the OPP film for example, Pylen Film-OT (P2102) manufactured by Toyobo Co., Ltd. is used.
• An organic compound having an interfacial tension against OPP of less than 20.7 mN/m has the property of being easily oriented at the interface between the ink and the printing medium after the ink has landed on the printing medium. It is believed that this property lowers the interfacial tension generated at the interface between the ink and the print medium and promotes the wetting and spreading of the ink on the print medium, thereby exhibiting excellent wettability.
• the organic compound preferably contains at least one selected from the group consisting of polyoxyalkylene alkyl ethers, polyoxyalkylene aryl ethers, polyoxyethylene alkyl sulfate esters, and acetylene glycol-based surfactants. More preferably, it contains at least one selected from the group consisting of naphthyl ether, polyoxyalkylene-2-ethylhexyl ether, polyoxyethylene lauryl sulfate, and acetylene glycol surfactant.
• polyoxyalkylene alkyl ethers include polyoxyalkylene-2-ethylhexyl ether, and commercially available products include Tergitol EH3 (manufactured by The Dow Chemical Company).
• Other specific examples of polyoxyalkylene alkyl ethers include polyoxyalkylene C12/C15 alkyl ethers, and commercially available products include GENAPOL EP2544 (manufactured by Clariant Japan Co., Ltd.).
• polyoxyalkylene aryl ether examples include polyoxyethylene ⁇ -naphthyl ether, and commercially available products include Braunon BN-3, BN-10, and BN-25 (manufactured by Aoki Yushi Kogyo Co., Ltd.). be done.
• polyoxyethylene alkyl sulfate examples include polyoxyethylene lauryl ether sulfate ammonium salt, and commercially available products are Hytenol LA-10, LA-12, and LA-16 (manufactured by Daiichi Kogyo Seiyaku Co., Ltd.). etc.
• acetylene glycol-based surfactants include Surfynol 485 (manufactured by Evonik Industries AG).
• Braunon BN-3 polyoxyethylene ⁇ -naphthyl ether
• Tergitol EH3 polyoxyalkylene glycol 2-ethylhexyl ether
• Hytenol LA-10 polyoxyethylene lauryl ether sulfate ammonium salt
• GENAPOL EP2544 poly oxyalkylene C12/C15 alkyl ethers
• acetylene glycol-based surfactants Surfinol 485), and the like are preferred.
• the content of the organic compound is preferably 0.05 to 1.5% by mass with respect to the total mass of the ink according to the present embodiment, from the viewpoint of wettability with respect to non-ink-absorbing media, and 0.10% by mass. It is more preferably 1% by mass, and even more preferably 0.3 to 0.7% by mass.
• the value obtained by (B)/(A) is 0.01 to 0.50, preferably 0.01 to 0.3, more preferably 0.05 to 0.2, and further preferably 0.075 to 0.125 preferable.
• the ink according to this embodiment may contain water.
• water water having a low content of impurities such as metal ions, that is, ion-exchanged water, distilled water, or the like is preferable.
• the content is preferably 50 to 90% by mass, more preferably 60 to 90% by mass, relative to the total mass of the ink according to the present embodiment. is more preferred, and 60 to 80% by mass is even more preferred.
• the ink according to the present embodiment preferably contains a surface tension modifier (excluding the above organic compound).
• a surface tension modifier excluding the above organic compound.
• Examples of surface tension modifiers include Surfynol 420 and 440 (manufactured by Evonik Industries AG), etc. Surfynol 440 is preferred.
• Both Surfynol 420 and 440 are highly hydrophobic compounds, and have the property of being easily oriented on the ink surface (interface between ink and air) after the ink lands on the printing medium. It is believed that this property lowers the surface tension of the ink and promotes the wetting and spreading on the printing media, thereby exhibiting excellent wettability even with water-based inks.
• the content is preferably 0.3 to 10% by mass with respect to the total mass of the ink according to the present embodiment. It is more preferably 2% by mass, and even more preferably 0.3 to 1% by mass.
• the ink according to this embodiment may contain a dispersant.
• Dispersants include, for example, styrene and its derivatives; vinylnaphthalene and its derivatives; ⁇ , ⁇ -ethylenically unsaturated carboxylic acid aliphatic alcohol esters; (meth)acrylic acid and its derivatives; maleic acid and its derivatives; itaconic acid and its derivatives; faric acid and its derivatives; vinyl acetate, vinyl alcohol, vinylpyrrolidone, acrylamide, and derivatives thereof; and hydrophilic monomers).
• Hydrophilic monomers include monomers such as acrylic acid and methacrylic acid, in which a carboxyl group remains after polymerization.
• Such copolymers include, for example, styrene-(meth)acrylic acid copolymer, styrene-(meth)acrylic acid-(meth)acrylic acid ester copolymer, (meth)acrylic acid ester-(meth) Examples include acrylic acid copolymers, polyethylene glycol (meth)acrylate-(meth)acrylic acid copolymers, styrene-maleic acid copolymers, and the like.
• styrene-(meth)acrylic acid copolymer styrene-(meth)acrylic acid-(meth)acrylic acid ester copolymer, (meth)acrylic acid ester-(meth)acrylic acid copolymer, and Polyethylene glycol (meth) acrylate - (meth) acrylic acid copolymer is preferred, styrene - (meth) acrylic acid copolymer, styrene - (meth) acrylic acid - (meth) acrylic acid ester copolymer, and (meth) ) acrylic acid ester-(meth)acrylic acid copolymer is more preferred, (meth)acrylic acid ester-(meth)acrylic acid copolymer is more preferred, and methacrylic acid ester-(meth)acrylic acid copolymer is particularly preferred.
• Types of copolymers include, for example, block copolymers, random copolymers, and graft copo
• (meth)acryl used in this specification includes both “acryl” and “methacryl”. The same applies to “(meth)acrylate” and the like.
• Dispersants can be synthesized or obtained as commercial products.
• Dispersants obtained by synthesis include, for example, AB block polymers disclosed in WO 2013/115071.
• Monomers constituting the A block of the AB block polymer disclosed in WO 2013/115071 are selected from (meth) acrylic acid and linear or branched C4 alkyl (meth) acrylates At least one type of monomer is preferably used, and at least one type of monomer selected from methacrylic acid and n-butyl methacrylate is preferred, and it is more preferred to use these two types of monomers together.
• the monomer constituting the B block of the AB block polymer disclosed in WO 2013/115071 is at least one monomer selected from benzyl methacrylate and benzyl acrylate, preferably benzyl methacrylate.
• Specific examples of AB block polymers include block copolymers disclosed in Synthesis Examples 3-8 of WO 2013/115071.
• dispersants include, for example, Joncyl 62, 67, 68, 678, 687 (styrene-acrylic copolymer manufactured by BASF); acrylic acid); BYKJET 9151, 9152, 9170, 9171 (wetting and dispersing agents manufactured by BYK);
• the mass average molecular weight (MW) of the dispersant is preferably 3,000 to 50,000, more preferably 7,000 to 25,000.
• the mass average molecular weight of the dispersant can be measured by gel permeation chromatography (GPC method). Specifically, HLC-8320GPC (manufactured by Tosoh Corporation) is used as the GPC apparatus, and two columns of TSK gel Super Multipore HZ-H (manufactured by Tosoh Corporation, inner diameter 4.6 mm ⁇ 15 cm) are used for elution. It can be measured using tetrahydrofuran as a liquid and TSK Standard (manufactured by Tosoh Corporation) as a standard sample.
• GPC method gel permeation chromatography
• the acid value of the dispersant is preferably 50-300 mgKOH/g, more preferably 80-275 mgKOH/g, and even more preferably 80-250 mgKOH/g.
• the dispersant can be used in a state of being mixed with the pigment.
• the pigment may be used in a state in which part or all of the surface of the pigment is coated with a dispersant. Alternatively, both of these states may be used together.
• the ratio of the total mass of the dispersant to the total mass of the pigment is preferably 0.01 to 1.0, more preferably 0.05 to 0.6. is more preferable, and 0.1 to 0.5 is even more preferable.
• the ink according to this embodiment may contain a fixing resin.
• the fixing resin at least one selected from polymers and waxes is preferable.
• Polymers are commercially available in the form of emulsions.
• Commercially available polymer emulsions include Superflex 420, 470, 890 (the above are urethane resin emulsions manufactured by Daiichi Kogyo Seiyaku Co., Ltd.); Hydran HW-350, HW-178, HW-163, HW-171, AP-20, AP-30, WLS-201, WLS-210 (the above are urethane resin emulsions manufactured by DIC Corporation); 0569, 0850Z, 2108 (the above are styrene-butadiene resin emulsions manufactured by JSR Corporation) ); AE980, AE981A, AE982, AE986B, AE104 (the above are acrylic resin emulsions manufactured by ETEC Co., Ltd.); NeoCryl A-1105, A-1125, A-1127 (the above are acrylic resin emulsions manufactured by DSM Coating Resin ); and the like.
• wax natural wax and synthetic wax can be used.
• Natural waxes include, for example, petroleum waxes such as paraffin wax and microcrystalline wax; lignite waxes such as montan wax; plant waxes such as carnauba wax and candelia wax; animal and plant waxes such as beeswax and lanolin; mentioned.
• Synthetic waxes include, for example, polyalkylene wax (preferably poly-C2-C4 alkylene wax), polyalkylene oxide wax (preferably poly-C2-C4 alkylene oxide oxide), paraffin wax, and the like.
• polyethylene wax, polypropylene wax, oxidized polyethylene wax, oxidized polypropylene wax, and paraffin wax are preferred.
• the average particle size of the wax is preferably 50 nm to 5 ⁇ m, more preferably 100 nm to 1 ⁇ m, in order to prevent clogging of the inkjet head.
• Waaxes are commercially available in the form of emulsions.
• Commercial wax emulsion products include, for example, CERAFLOUR 925, 929, 950, 991, AQUACER 498, 515, 526, 531, 537, 539, 552, 1547, AQUAMAT 208, 263, 272; Mitsui Hi-Wax NL100, NL200, NL500, 4202E, 1105A, 2203A, NP550, NP055, NP505 (manufactured by Mitsui Chemicals, Inc.); KUE-100, 11 (manufactured by Sanyo Chemical Industries, Ltd.) HYTEC P-5300, E-6500, 9015, 6400 (manufactured by Toho Chemical Industry Co., Ltd.);
• the content is preferably 1 to 20% by mass, more preferably 3 to 15% by mass, relative to the total mass of the ink according to the present embodiment. is more preferable.
• the content of the fixing resin By setting the content of the fixing resin to 1% by mass or more, there is a tendency to exhibit good fixability to print media.
• the content of the fixing resin By setting the content of the fixing resin to 20% by mass or less, the ejection property and storage stability of the ink tend to be improved.
• the ink according to the present embodiment may contain ink preparation agents such as antifungal agents, preservatives, pH adjusters, chelating reagents, antirust agents, antifoaming agents, water-soluble ultraviolet absorbers, and antioxidants, if necessary. may contain.
• the content of each ink preparation agent can be arbitrarily set according to the use of the ink.
• Antifungal agents include, for example, sodium dehydroacetate, sodium benzoate, sodium pyridinethione-1-oxide, ethyl p-hydroxybenzoate, 1,2-benzisothiazolin-3-one and salts thereof.
• antiseptics examples include organic sulfur, organic nitrogen sulfur, organic halogen, haloarylsulfone, iodopropargyl, haloalkylthio, nitrile, pyridine, 8-oxyquinoline, benzothiazole, Isothiazolines, dithiols, pyridine oxides, nitropropanes, organic tins, phenols, quaternary ammonium salts, triazines, thiazines, anilides, adamantanes, dithiocarbamates, brominated indanones, benzyl bromide Acetate-based compounds, inorganic salt-based compounds, and the like can be mentioned.
• organic halogen compounds include sodium pentachlorophenol.
• pyridine oxide compounds include sodium 2-pyridinethiol-1-oxide.
• isothiazoline compounds include 1,2-benzisothiazolin-3-one, 2-n-octyl-4-isothiazolin-3-one, 5-chloro-2-methyl-4-isothiazolin-3- on, 5-chloro-2-methyl-4-isothiazolin-3-one magnesium chloride, 5-chloro-2-methyl-4-isothiazolin-3-one calcium chloride, 2-methyl-4-isothiazolin-3-one calcium chloride and the like.
• antiseptic and antifungal agents include anhydrous sodium acetate, sodium sorbate, sodium benzoate, trade names Proxel GXL (S), Proxel LV, and Proxel XL-2 (S) manufactured by Arch Chemicals. be done.
• pH adjuster examples include alkanolamines such as diethanolamine, triethanolamine and N-methyldiethanolamine; alkali metal hydroxides such as lithium hydroxide, sodium hydroxide and potassium hydroxide; ammonium hydroxide (ammonia water). alkali metal carbonates such as lithium carbonate, sodium carbonate, sodium hydrogencarbonate and potassium carbonate; alkali metal salts of organic acids such as sodium silicate and potassium acetate; inorganic bases such as disodium phosphate;
• Chelating agents include, for example, disodium ethylenediaminetetraacetate, sodium nitrilotriacetate, sodium hydroxyethylethylenediaminetriacetate, sodium diethylenetriaminepentaacetate, sodium uracil diacetate and the like.
• rust preventives include acidic sulfites, sodium thiosulfate, ammonium thioglycolate, diisopropylammonium nitrite, pentaerythritol tetranitrate, and dicyclohexylammonium nitrite.
• antifoaming agent examples include silica mineral oil-based, olefin-based, and acetylene-based antifoaming agents.
• Commercially available antifoaming agents include, for example, Surfynol DF37, DF58, DF110D, DF220, MD-20, Olefin SK-14 and the like manufactured by Shin-Etsu Chemical Co., Ltd.
• Water-soluble UV absorber examples include sulfonated benzophenone-based compounds, benzotriazole-based compounds, salicylic acid-based compounds, cinnamic acid-based compounds, and triazine-based compounds.
• antioxidant for example, various organic and metal complex anti-fading agents can be used.
• organic anti-fading agents include hydroquinones, alkoxyphenols, dialkoxyphenols, phenols, anilines, amines, indanes, chromans, alkoxyanilines, and heterocycles.
• a method for preparing the ink according to the present embodiment is not particularly limited, and a known preparation method can be employed. As an example thereof, for example, a method of preparing an aqueous dispersion containing a pigment and a dispersant, adding and mixing a water-soluble organic solvent, an organic compound, and, if necessary, an ink preparation agent to this dispersion. mentioned.
• Methods for preparing the dispersion include, for example, a phase inversion emulsification method, an acid precipitation method, an interfacial polymerization method, an in-situ polymerization method, an in-liquid curing coating method, a coacervation (phase separation) method, an in-liquid drying method, and a melting method.
• Dispersion cooling method, aerial suspension coating method, spray drying method and the like can be mentioned.
• the phase inversion emulsification method, the acid precipitation method, and the interfacial polymerization method are preferable, and the phase inversion emulsification method is more preferable.
• a dispersant is dissolved in an organic solvent such as 2-butanone, and an aqueous solution of a neutralizer is added to prepare an emulsion.
• a pigment is added to the obtained emulsified liquid to carry out a dispersion treatment.
• the desired dispersion can be obtained by distilling off the organic solvent and part of the water from the thus obtained liquid under reduced pressure.
• Dispersion treatment can be performed using a sand mill (bead mill), roll mill, ball mill, paint shaker, ultrasonic disperser, microfluidizer, or the like.
• a sand mill bead mill
• beads having a particle size of about 0.01 to 1 mm can be used, and the filling rate of the beads can be appropriately set for dispersion treatment.
• the particle diameters of the particles contained in the dispersion liquid can be made uniform. If foaming occurs during preparation of the dispersion, a very small amount of a known silicone-based, acetylene glycol-based, or other antifoaming agent can be added.
• the ink according to the present embodiment preferably has a low content of inorganic impurities such as chlorides of metal cations (eg, sodium chloride) and metal sulfates (eg, sodium sulfate).
• inorganic impurities are often contained in commercially available pigments.
• a guideline for the content of inorganic impurities is approximately 1% by mass or less relative to the total mass of the pigment, and the lower limit is ideally below the detection limit of the analytical instrument, that is, 0% by mass.
• a method for obtaining a pigment with less inorganic impurities includes, for example, a method using a reverse osmosis membrane; A method of drying; a method of exchanging and adsorbing inorganic impurities with an ion exchange resin;
• the ink according to the present embodiment is preferably fine filtered.
• Membrane filters, glass filter paper and the like can be used for precision filtration.
• the pore size of a filter or the like for microfiltration is usually 0.5 to 20 ⁇ m, preferably 0.5 to 10 ⁇ m.
• the ink according to this embodiment is also excellent in storage stability, redispersibility, color development, and saturation. Also, an image recorded using the ink according to the present embodiment is excellent in various fastness properties such as water resistance, light resistance, and heat resistance. In addition, the ink according to the present embodiment has little coating unevenness during image formation, and is excellent in image formability.
• the ink set according to this embodiment includes the ink according to this embodiment described above and another ink different from the ink.
• the other ink is not particularly limited as long as it has a different composition from the ink according to the present embodiment, but preferably has a different hue from the ink according to the present embodiment.
• the ink set according to this embodiment includes the ink or ink set according to this embodiment described above, and printing media.
• print media is not particularly limited, print media that absorb ink poorly or that do not absorb ink are preferable, and print media that do not absorb ink are more preferable.
• ink-poor printing media include plain paper having no ink-receiving layer, media used for gravure printing, offset printing, and the like, art paper, coated paper, matte paper, cast paper, and the like.
• non-ink-absorbing printing media include PET (polyethylene terephthalate) film, PP (polypropylene) film, vinyl chloride sheet, glass, and rubber.
• the inkjet printing method according to the present embodiment is a method of printing by ejecting droplets of the ink according to the present embodiment described above according to a print signal and attaching the droplets to a printing medium.
• the ink nozzles and the like of the inkjet printer for ejecting ink can be appropriately selected according to the purpose.
• the inkjet printing method includes: a method in which a large number of inks with a low pigment content in the ink are ejected in a small volume to improve image quality; A method of improving image quality by using a plurality of different inks; a method of using both a colorless and transparent ink and an ink containing a pigment to improve the fixability of the pigment to the printing medium;
• a known method can be adopted as the inkjet printing method. Examples thereof include a charge control method, a drop-on-demand method (also referred to as a pressure pulse method), an acoustic inkjet method, a thermal inkjet method, and the like.
• the inkjet printing method may be either a multi-pass method or a single-pass method (one-pass printing method).
• single-pass printing using a line head type inkjet printer is also preferably performed for the purpose of increasing the printing speed.
• a container (ink tank) containing ink is loaded in a predetermined position of an inkjet printer, and the print media is printed by the above printing method.
• Full-color printing can also be achieved by loading containers containing inks of respective colors into predetermined positions of an inkjet printer and printing on printing media by the above-described printing method.
• a surface modification treatment When using a printing medium that does not have an ink-receiving layer, it is preferable to apply a surface modification treatment to the printing medium for the purpose of improving the fixability of the coloring material.
• Examples of surface modification treatment include corona discharge treatment, plasma treatment, and flame treatment. It is generally known that the effect of surface modification treatment decreases over time. Therefore, it is preferable to perform the surface modification treatment step and the inkjet printing step continuously, and it is more preferable to perform the surface modification treatment step immediately before the inkjet printing step.
• a combination of preferable items is more preferable, and a combination of more preferable items is even more preferable.
• part means parts by mass and “%” means % by mass, unless otherwise specified.
• the pigment solid content is a conversion value obtained by calculating only the pigment solid content from the total amount of solid content.
• Preparation Example 1 Preparation of Pigment Dispersion Liquid DP1>
• a block copolymer was obtained by repeating Synthesis Example 3 of International Publication No. 2013/115071.
• the resulting block copolymer had an acid value of 105 mgKOH/g and a mass average molecular weight of 25,000.
• the resulting block copolymer (6 parts) was dissolved in 2-butanone (30 parts) to form a homogeneous solution.
• a solution obtained by dissolving a 28% aqueous ammonia solution (0.68 parts) in ion-exchanged water (53 parts) was added to this solution, and the mixture was stirred for 1 hour to obtain an emulsion.
• Pigment Blue 15:4 (manufactured by Dainichiseika Kogyo Co., Ltd., CHROMOFINE BLUE 4851) (20 parts) was added and dispersed in a sand grinder at 1500 rpm for 15 hours. Ion-exchanged water (100 parts) was added dropwise to the obtained liquid, and the dispersion beads were removed by filtration. Then, 2-butanone and part of the water were distilled off under reduced pressure using an evaporator to obtain a pigment having a pigment solid content of 12%. A dispersion was obtained. The obtained pigment dispersion is designated as "DP1".
• Examples 1 to 13 and Comparative Examples 1 to 5 After mixing the components shown in Tables 1 to 3 below, the mixture was filtered through a membrane filter with a pore size of 3 ⁇ m to obtain inks of Examples 1 to 13 and Comparative Examples 1 to 5.
• the numerical value in the column of each component in Tables 1 to 3 represents the amount (parts) of the component used, and "-" means that the component is not used.
• "-" in the surface tension column of Table 3 means that the surface tension measurement was impossible due to the incompatibility of the ink.
• Dp1 Pigment dispersion obtained in Preparation Example 1
• Dp2 Pigment dispersion obtained in Preparation Example 2
• CABOJET CAB-O-JET 400 (self-dispersing black pigment liquid, manufactured by Cabot Corporation, pigment solid content 15.1%)
• Dp3 Pigment dispersion obtained in Preparation Example 3
• 15PD 1,5-pentanediol (manufactured by Tokyo Chemical Industry Co., Ltd., boiling point: 242 ° C., logP value: -0.635, interfacial tension against OPP: 24.3 mN / m)
• 14BD 1,4-butanediol (manufactured by Tokyo Chemical Industry Co., Ltd., boiling point: 230 ° C., logP value: -1.164, interfacial tension against OPP: 30.7 mN / m)
• 3MB 3-methoxy-1-butanol
• the inks of Examples 1 to 13 were superior in wettability to the OPP film compared to the inks of Comparative Examples 1 to 5, and were equal or superior in compatibility. From these results, it can be seen that the inks of Examples 1 to 13 are excellent inks having both wettability and compatibility.

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• 2022
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