WO2020162270A1 - Encre, procédé d'impression à jet d'encre, et appareil d'impression - Google Patents

Encre, procédé d'impression à jet d'encre, et appareil d'impression Download PDF

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Publication number
WO2020162270A1
WO2020162270A1 PCT/JP2020/003047 JP2020003047W WO2020162270A1 WO 2020162270 A1 WO2020162270 A1 WO 2020162270A1 JP 2020003047 W JP2020003047 W JP 2020003047W WO 2020162270 A1 WO2020162270 A1 WO 2020162270A1
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WIPO (PCT)
Prior art keywords
ink
examples
carbon black
water
resin
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PCT/JP2020/003047
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English (en)
Japanese (ja)
Inventor
径明 武田
阿衣子 松村
麻衣子 岩見
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日本化薬株式会社
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Priority to JP2020571117A priority Critical patent/JP7408585B2/ja
Publication of WO2020162270A1 publication Critical patent/WO2020162270A1/fr

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Classifications

    • 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
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • 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
    • C09D11/324—Inkjet printing inks characterised by colouring agents containing carbon black
    • 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

Definitions

  • the present invention relates to an ink containing carbon black, an ink jet recording method using the ink, a recording medium to which the ink is attached, an ink tank containing the ink, and an ink jet printer including the ink tank.
  • a recording method using an inkjet printer is a method in which small droplets of ink are generated and attached to various recording media (paper, film, cloth, etc.) for recording.
  • various recording media paper, film, cloth, etc.
  • Black ink is the ink most often used for printing recorded images containing characters. Further, a high print density is required for the recorded image.
  • the colorant contained in the inkjet ink is roughly classified into a water-soluble dye and a water-insoluble dye or pigment.
  • the latter aqueous ink containing a colorant is a dispersion ink in which the colorant is dispersed without being dissolved in the ink.
  • Carbon black is widely used as a water-insoluble colorant contained in black ink.
  • recording media such as coated paper that does not have an ink receiving layer, such as art paper and coated paper, are usually used.
  • the recording medium having no ink receiving layer can absorb less ink than the recording medium having an ink receiving layer. Therefore, it is difficult to improve the print density in a recording medium having no ink receiving layer, which is a serious problem.
  • the print density can be improved to some extent by increasing the content of the colorant in the ink.
  • a dispersion ink containing a water-insoluble colorant if the content of the colorant that is a solid content is increased, the dispersion stability of the ink is reduced. Therefore, there is a strong demand for a dispersed ink containing a water-insoluble colorant and capable of obtaining a higher print density.
  • Patent Documents 1 to 3 disclose inks containing carbon black.
  • the present invention provides an aqueous ink containing carbon black as a water-insoluble colorant and having a high black print density, particularly a high black print density when recorded on a recording medium having no ink receiving layer. It is an issue.
  • the present inventors have completed the present invention described in 1) to 7) below as a result of intensive studies to solve the above problems.
  • An ink jet recording method for performing recording by ejecting an ink droplet of the ink according to any one of the above 1) to 3) from an ink jet printer and adhering it to a recording medium.
  • An inkjet printer comprising the ink tank according to 6) above.
  • the ink according to the present embodiment contains carbon black, a dispersant, an organic solvent, a resin, and water, and the BET specific surface area of the carbon black is 80 m 2 /g or more, and the water-octanol partition coefficient of the organic solvent. Is ⁇ 0.05 or more and less than 3.50, the resin is a compound different from the dispersant, and the acid value is greater than 0 mgKOH/g and less than 100 mgKOH/g.
  • the carbon black contained in the ink according to the present embodiment has a BET specific surface area of 80 m 2 /g or more, preferably 85 m 2 /g or more, more preferably 90 m 2 /g or more.
  • a high print density can be obtained.
  • Carbon black tends to have a higher print density as the BET specific surface area increases. Therefore, the upper limit of the BET specific surface area is not particularly limited. However, even if the BET specific surface area is continuously increased, the print density reaches a peak in the middle, and the print density does not permanently increase.
  • the BET specific surface area when the printing density reaches a peak is usually 300 m 2 /g or less, preferably 250 m 2 /g or less, and more preferably 200 m 2 /g or less. Therefore, the upper limit of the optimum BET specific surface area of carbon black is sufficient.
  • the type of carbon black is not particularly limited, and may be any of thermal black, acetylene black, oil furnace black, gas furnace black, lamp black, gas black, channel black and the like.
  • the carbon black include, for example, PRINTEX 60, 85, 75, 50L, alpha, P, 55, FP, F alpha, L, HIBLACK 30, 30L, 40L, 45LB manufactured by Orion Engineered Carbons. , NEROX 505, 510, 600, 605, SPECIAL BLACK 550, 4, 4A; MA77, MA7, MA8, MA100, MA100R, MA100S, MCF88, MA600, #1000, 1000N, 750B, 650B, 52 manufactured by Mitsubishi Chemical Corporation.
  • the above carbon black does not include chemically modified carbon black, that is, self-dispersing carbon black.
  • the total content of the above carbon black is usually 1% to 20%, preferably 2% to 10%, more preferably 3% to 8%.
  • a known dispersant can be used as the dispersant contained in the ink according to the present embodiment.
  • the dispersant is used for the purpose of dispersing carbon black in the ink.
  • a dispersant having a functional group that exhibits acidity in a free form such as a carboxy group, a sulfo group, or a phosphoric acid group, is preferable.
  • monomers selected from styrene, (meth)acrylate, and (meth)acrylic acid preferably 2 or more types of monomers, more preferably 2 to 6 types of monomers, and further preferably 2 to 4 types of monomers). Polymers composed of monomers, particularly preferably 2 to 3 types of monomers) are preferred.
  • (meth)acrylate is used to mean both acrylate and methacrylate, and (meth)acrylic acid and the like are also the same.
  • the (meth)acrylate a monomer selected from alkyl(meth)acrylate and arylalkyl(meth)acrylate is preferable, and a monomer selected from alkylmethacrylate and arylalkylmethacrylate is more preferable.
  • the alkyl(meth)acrylate is preferably C1-C4 alkyl(meth)acrylate, more preferably C1-C4 alkyl methacrylate, further preferably alkyl(meth)acrylate selected from methyl methacrylate and butyl methacrylate, and n-butyl methacrylate. Is particularly preferable.
  • the arylalkyl(meth)acrylate is preferably C6-C10 aryl C1-C4 alkyl(meth)acrylate, more preferably C6-C10 aryl C1-C4 alkyl methacrylate, further preferably phenyl C1-C4 alkyl methacrylate, and benzyl methacrylate. Particularly preferred.
  • Examples of the above polymer include a polymer composed of at least one monomer selected from alkyl (meth)acrylate, arylalkyl (meth)acrylate, and (meth)acrylic acid; and a styrene-(meth)acrylic-based polymer. Coalescence is preferred.
  • the polymer composed of at least one selected from alkyl(meth)acrylate, arylalkyl(meth)acrylate, and (meth)acrylic acid is a block A and a block B.
  • -B block polymers are preferred.
  • the A block is preferably composed of arylalkyl (meth)acrylate and can include (meth)acrylic acid.
  • the content of (meth)acrylic acid at this time is usually 0 mol% to 5 mol%, preferably 0 mol% to 3 mol%, and more preferably 0 mol% to 1 with respect to the arylalkyl (meth)acrylate. Mol%, and more preferably 0 mol% to 0.1 mol%.
  • the B block is preferably a copolymer composed of alkyl (meth)acrylate and (meth)acrylic acid.
  • a water-insoluble polymer is preferable as the AB block polymer.
  • the “water-insoluble polymer” means that the solubility in 1 liter of water at 25° C. is usually 5 g or less, preferably 3 g or less, more preferably 1 g or less, still more preferably 0.5 g or less.
  • the lower limit of solubility includes 0 g.
  • Examples of the AB block polymer include AB block polymers obtained by the living radical polymerization method disclosed in WO 2013/115071.
  • Preferred and international publications include WO 2013/115071. It may be similar to the issue.
  • the Joncryl series manufactured by BASF is preferable.
  • the acid value of the dispersant is usually 80 mgKOH/g to 140 mgKOH/g, preferably 90 mgKOH/g to 130 mgKOH/g, and more preferably 100 mgKOH/g to 120 mgKOH/g. By setting the acid value within these ranges, dispersibility and storage stability tend to be good.
  • the above dispersant can be used in a state of being mixed with carbon black. Further, the surface of carbon black can be used in a state of being coated with a dispersant. Also, both of them can be used together. In the present specification, “coating” means both a state in which the entire surface of carbon black is covered with a dispersant, and a state in which a part of the surface of carbon black is covered with a dispersant.
  • the average particle diameter (D50) of the particles in the dispersion is usually 50 nm to 250 nm, preferably 60 nm to 150 nm. When the particle size is within such a range, the dispersion stability and the ejection stability are improved, and the print density of a recorded image tends to be high.
  • the “average particle diameter” means the average particle diameter of particles in a liquid, which is measured using a laser light scattering method.
  • the ratio of the total mass of the dispersant to the total mass of carbon black is usually 0.1 to 1.0, preferably 0.1 to 0.6, more preferably 0.2 to 0.5.
  • the organic solvent contained in the ink according to the present embodiment has a water-octanol distribution coefficient of ⁇ 0.05 or more and less than 3.50, preferably ⁇ 0.02 or more and less than 3.50, and more preferably ⁇ 0. It is 01 or more and less than 3.50, and more preferably 0.00 or more and 3.49 or less.
  • the “water-octanol partition coefficient” is a value obtained by calculation. Specifically, ChemDraw Professional ver. manufactured by Perkin Elmer. It means the numerical value of "ClogP" calculated using 16.0. The numbers calculated in this way do not have a fixed number of decimal places. Therefore, in this specification, the third digit after the decimal point is rounded off and the second digit after the decimal point is described. If the calculated value is up to the second digit after the decimal point, enter the numerical value as it is.
  • organic solvent examples include tripropylene glycol monomethyl ether, ethylene glycol monoallyl ether, isopropyl glycol, 3-methoxy-3-methyl-1-butanol, butyl triglycol, diethylene glycol monoisobutyl ether, propyl propylene glycol (propylene glycol).
  • a mono-, di-, or tri-C2-C3 alkylene glycol mono-C1-C6 alkyl ether which can have as a substituent; a straight chain such as 1,2-pentanediol, 1,2-hexanediol, or 1,2-octanediol Alkanediol, preferably linear 1,2-alkanediol, more preferably linear 1,2-(C5-C8)alkanediol; 2,2-diethyl-1,3-propanediol, 2-methyl-2, Branched chain alkanes such as 4-pentanediol, 2,2,4-trimethyl-1,3-pentanediol, 2-ethyl-1,3-hexanediol, 2-butyl-4-ethyl-1,6-hexanediol
  • a diol preferably a branched chain alkanediol having a total carbon number of C6-C
  • Dicarboxylic acid diesters such as adipate [bis(2-(2-butoxyethoxy)ethyl)adipate], preferably C6 dicarboxylic acid diesters, more preferably C6 dicarboxylic acid di(alkoxyalkoxyalkyl)esters, and further preferably C6 dicarboxylic acid diesters.
  • C4 alkoxy C2 alkoxy C2 alkyl) ester C8 alkane diol mono C1-C4 acylate, preferably C8 alkane diol mono C4 acylate, more preferably Is a branched chain C8 alkanediol mono-C4 acylate, more preferably branched chain C8 alkanediol monoisobutyrate, and particularly preferably texanol (2,2,4-trimethyl-1,3-pentanediol-1-isobutyrate and 2,2). , 4-trimethyl-1,3-pentanediol-3-isobutyrate, preferably a mixture thereof); and the like.
  • preferable examples include, for example, tripropylene glycol monomethyl ether (-0.03), 2-methyl-2,4-pentanediol (-0.02), 1,2-pentanediol (0. 00), ethylene glycol monoallyl ether (0.03), isopropyl alcohol (0.07), isopropyl glycol (0.09), diethylene glycol ethyl methyl ether (0.13), dipropylene glycol dimethyl ether (0.36), 3-methoxy-3-methyl-1-butanol (0.42), butyltriglycol (0.49), diethylene glycol diethyl ether (0.52), 1,2-hexanediol (0.53), diethylene glycol monoisobutyl Ether (0.54), propyl propylene glycol (0.62), butyl diglycol (0.67), dipropylene glycol-n-propyl ether (0.75), 2,2-diethyl-1,3-propane
  • the total content of the above organic solvents is usually 1% to 12%, preferably 1.5% to 11%, more preferably 2% to 10%.
  • the resin contained in the ink according to this embodiment is a compound different from the dispersant.
  • the "compound different from the dispersant” means, for example, when the dispersant is an AB block polymer composed of a specific monomer, a random copolymer composed of the same monomer, an ABA block polymer, etc. Since it is a compound different from the agent, it means that it can be used as a resin. Further, when the dispersant is an AB block polymer composed of a specific monomer, even if the resin is also an AB block polymer, polymers having different types of monomers, polymers having different ratios of monomers, etc. It is a compound different from the dispersant and can be used as a resin. That is, even the compounds described above as the dispersant, compounds other than the compound used as the dispersant can be used as the resin.
  • the above resin has an acid value.
  • the acid value of the resin is more than 0 mgKOH/g and less than 100 mgKOH/g, preferably 1 mgKOH/g to 90 mgKOH/g, more preferably 3 mgKOH/g to 80 mgKOH/g, further preferably 6 mgKOH/g to 70 mgKOH/g, Particularly preferred is 10 mgKOH/g to 70 mgKOH/g, and most preferred is 13 mgKOH/g to 65 mgKOH/g.
  • the acid value of the above resin can be measured by a known method such as a titration method. Further, when the acid value is described in the manufacturer's catalog, the numerical value can be adopted.
  • the resin include, for example, (meth)acrylic copolymer, styrene/(meth)acrylic copolymer, polystyrene resin, (meth)acrylamide copolymer, styrene/maleic anhydride copolymer, polyurethane resin.
  • Resins selected from polyethylene resins, vinyl acetate/ethylene copolymers, vinyl chloride/ethylene copolymers, polybutadiene resins, epoxy resins, silicone resins, and the like.
  • the above resin can be obtained as a commercially available product or by synthesizing by a known method.
  • examples thereof include (meth)acrylic acid, (meth)acrylic acid ester, acrylonitrile, cyanoacrylate, acrylamide, olefin, styrene, vinyl acetate, vinyl chloride, vinyl alcohol, vinyl ether, vinylpyrrolidone, vinylpyridine, vinylcarbazole. , Vinyl imidazole, vinylidene chloride, and the like may be used.
  • the resin is a copolymer, it may be in any form of a random copolymer, a block copolymer, an alternating copolymer and a graft copolymer.
  • the above resin can be used as an aqueous solution or an aqueous emulsion. Among these, it is preferable to use as an aqueous resin emulsion.
  • those obtained by synthesis include, for example, the resin emulsions disclosed as Preparation Examples 3 to 5 in WO 2015/147192.
  • the total content of the above resin is usually 0.1% to 15%, preferably 0.5% to 10%, and more preferably 2% to 8% as solid content.
  • water As water contained in the ink according to the present embodiment, it is preferable to use water containing few impurities such as metal ions and inorganic salts. Examples of such water include ion-exchanged water and distilled water.
  • Water is the balance excluding the above components, the viscosity modifier, the surfactant, and the ink preparation agent, which will be described later, and the content thereof is usually 30% to 80%, preferably 40% to 75%. It is preferably about 50% to 70%.
  • the ink according to this embodiment may further contain a viscosity modifier.
  • the viscosity range of ink that can be ejected is usually determined based on the specifications of a printer head (head that ejects ink) to be mounted. Therefore, it is possible to add a viscosity modifier to the ink and adjust the viscosity within an appropriate range.
  • the viscosity modifier is not particularly limited as long as it is a substance that can adjust the viscosity of the ink, and known substances can be used. Specific examples thereof include water-soluble organic solvents (excluding the above organic solvents), sugars and the like. Among these, water-soluble organic solvents having a Clog P value of usually less than ⁇ 0.05, preferably ⁇ 0.06 or less, more preferably ⁇ 0.07 or less, and further preferably ⁇ 0.08 or less are mentioned. ..
  • the lower limit of the value of Clog P of the water-soluble organic solvent is not particularly limited, but is usually ⁇ 4.00 or more, preferably ⁇ 3.00 or more, more preferably ⁇ 2.00 or more, further preferably ⁇ 1.50 or more. is there.
  • water-soluble organic solvents examples include isopropyl diglycol (-0.08), dipropylene glycol monomethyl ether (-0.16), ethanol (-0.24), 3-methyl-1,5- Pentanediol (-0.24), diethylene glycol dimethyl ether (-0.26), propylene glycol monomethyl ether (-0.30), 3-methyl-1,3-butanediol (-0.33), trimethylolpropane ( -0.39), N-methyl-2-pyrrolidone (-0.40), 1,2-butanediol (-0.53), 3-ethyl-3-hydroxymethyloxetane (-0.58), 1 ,5-Pentanediol (-0.64), 2-methyl-1,3-propanediol (-0.64), dipropylene glycol (-0.69), 1,3-butanediol (-0.73) ), methyldiglycol (-0.78), methyltriglycol (-0.96),
  • the total content of the water-soluble organic solvent is usually 0% to 55%, preferably 5% to 40%, more preferably 10% to 30%.
  • the ink according to this embodiment may further contain a surfactant.
  • the printing speed of industrial inkjet printers is usually variable. Therefore, it is preferable to properly adjust the surface tension of the ink based on the printing speed.
  • the surface tension of the ink can be adjusted by adding a surfactant to the ink.
  • surfactant examples include anionic, cationic, amphoteric, nonionic, silicone-based, and fluorine-based surfactants, and one or more of these can be selected and used.
  • surfactants selected from nonionic and silicone type are preferable, and it is more preferable to select one or more kinds of surfactants from nonionic and silicone type, and one or more kinds selected from silicone type. It is further preferred to select a surfactant.
  • anionic surfactant examples include alkyl sulfocarboxylate, ⁇ -olefin sulfonate, polyoxyethylene alkyl ether acetate, N-acyl amino acid and its salt, N-acyl methyl taurine salt, alkyl sulfate polyoxy.
  • cationic surfactants examples include 2-vinylpyridine derivatives and poly-4-vinylpyridine derivatives.
  • amphoteric surfactant examples include lauryldimethylaminoacetic acid betaine, 2-alkyl-N-carboxymethyl-N-hydroxyethylimidazolinium betaine, coconut oil fatty acid amidopropyldimethylaminoacetic acid betaine, polyoctylpolyaminoethylglycine, and imidazoline. Examples thereof include derivatives.
  • nonionic surfactants include ethers such as polyoxyethylene nonylphenyl ether, polyoxyethylene octyl phenyl ether, polyoxyethylene dodecyl phenyl ether, polyoxyethylene oleyl ether, polyoxyethylene lauryl ether, and polyoxyethylene alkyl ether.
  • System Polyoxyethylene oleate, polyoxyethylene distearate, sorbitan laurate, sorbitan monostearate, sorbitan monooleate, sorbitan sesquioleate, polyoxyethylene monooleate, polyoxyethylene stearate, etc.
  • silicone-based surfactant examples include polyether-modified siloxane and polyether-modified polydimethylsiloxane. Examples thereof include BYK-345, BYK-348 (manufactured by BYK Chemie, polyether-modified polydimethylsiloxane); BYK-347 (polyether-modified siloxane), BYK-349, and BYK-3455.
  • fluorine-based surfactant for example, a perfluoroalkyl sulfonic acid compound, a perfluoroalkyl carboxylic acid compound, a perfluoroalkyl phosphoric acid ester compound, a perfluoroalkyl ethylene oxide adduct, a perfluoroalkyl ether group in the side chain.
  • a perfluoroalkyl sulfonic acid compound for example, a perfluoroalkyl carboxylic acid compound, a perfluoroalkyl phosphoric acid ester compound, a perfluoroalkyl ethylene oxide adduct, a perfluoroalkyl ether group in the side chain.
  • examples thereof include polyoxyalkylene ether polymer compounds. Examples include Dupont's Zonyl TBS, FSP, FSA, FSN-100, FSN, FSO-100, FSO, FS-300, Capstone FS-30, FS-31; OMNOVA's
  • the ink according to the present embodiment may further contain a component other than the above as an ink preparation agent, if necessary.
  • the ink preparation agent include antifungal agents, preservatives, pH adjusters, chelating agents, rust preventives, water-soluble ultraviolet absorbers, water-soluble polymer compounds, antioxidants and the like.
  • the total content of the ink preparation agent is usually 0% to 30%, preferably 0% to 10%, more preferably 0% to 5%.
  • mildew-proofing agent examples include sodium dehydroacetate, sodium benzoate, sodium pyridinethione-1-oxide, p-hydroxybenzoic acid ethyl ester, 1,2-benzisothiazolin-3-one and salts thereof.
  • preservatives include organic sulfur-based, organic nitrogen-sulfur-based, organic halogen-based, haloaryl sulfone-based, iodopropargyl-based, haloalkylthio-based, nitrile-based, pyridine-based, 8-oxyquinoline-based, benzothiazole-based, Isothiazoline, dithiol, pyridine oxide, nitropropane, organotin, phenol, quaternary ammonium salt, triazine, thiazine, anilide, adamantane, dithiocarbamate, brominated indanone, benzyl Examples thereof include bromine acetate-based compounds and inorganic salt-based compounds.
  • organic halogen-based compound examples include sodium pentachlorophenol.
  • pyridine oxide compound examples include 2-pyridinethiol-1-oxide sodium.
  • isothiazoline compound examples include, for example, 1,2-benzisothiazolin-3-one, 2-n-octyl-4-isothiazolin-3-one, and 5-chloro-2-methyl-4-isothiazolin-3-one.
  • Specific examples of the other antiseptic/antifungal agents include anhydrous sodium acetate, sodium sorbate, sodium benzoate, Proxel GXL(S) and Proxel XL-2(S) manufactured by Arch Chemical.
  • any substance can be used as long as it can control the pH of the ink within the range of, for example, 5 to 11 without adversely affecting the prepared ink.
  • alkanolamines such as diethanolamine, triethanolamine and N-methyldiethanolamine
  • hydroxides of alkali metals such as lithium hydroxide, sodium hydroxide and potassium hydroxide
  • ammonium hydroxide ammonia water
  • alkali metal carbonates such as lithium carbonate, sodium carbonate, sodium hydrogen carbonate and potassium carbonate
  • alkali metal salts of organic acids such as sodium silicate and potassium acetate
  • inorganic bases such as disodium phosphate.
  • chelating agent examples include disodium ethylenediaminetetraacetate, sodium nitrilotriacetate, sodium hydroxyethylethylenediaminetriacetate, sodium diethylenetriaminepentaacetate, sodium uracildiacetate, and the like.
  • rust preventives include acidic sulfite, sodium thiosulfate, ammonium thioglycolate, diisopropylammonium nitrite, pentaerythritol tetranitrate, dicyclohexylammonium nitrite and the like.
  • water-soluble ultraviolet absorbers examples include sulfonated benzophenone compounds, benzotriazole compounds, salicylic acid compounds, cinnamic acid compounds, and triazine compounds.
  • water-soluble polymer compounds examples include polyethylene glycol, polyvinyl alcohol, cellulose derivatives, polyamines and polyimines.
  • organic type and metal complex type anti-fading agents can be used.
  • organic anti-fading agent include, for example, hydroquinones, alkoxyphenols, dialkoxyphenols, phenols, anilines, amines, indanes, chromanes, alkoxyanilines, heterocycles and the like. Can be mentioned.
  • the ink according to this embodiment can be prepared by a known method.
  • An example thereof is a method in which a dispersion liquid of carbon black is prepared, and an organic solvent and, if necessary, various ink preparation agents are added to the dispersion liquid and mixed.
  • the dispersant When preparing a dispersion, for example, the dispersant is dissolved in an organic solvent such as 2-butanone, and an aqueous solution of a neutralizing agent is added to prepare an emulsion. Next, carbon black is added to the obtained emulsion to carry out dispersion treatment to obtain a liquid. By distilling off the organic solvent and a part of water from the liquid thus obtained under reduced pressure, a dispersion liquid containing carbon black can be obtained.
  • an organic solvent such as 2-butanone
  • the dispersion treatment can be performed, for example, by stirring a solution or emulsion of a dispersant and carbon black with a sand mill (beads mill), a roll mill, a ball mill, a paint shaker, an ultrasonic disperser, a microfluidizer, or the like.
  • a sand mill beads mill
  • beads having a particle diameter of about 0.01 mm to 3 mm can be used.
  • the efficiency of the dispersion treatment can be adjusted by adjusting the filling rate of beads, the dispersion time, the amount of carbon black added, and the like.
  • the particle size of the contained particles can be made uniform within a certain range.
  • the ink according to this embodiment is used for ink jet recording, it is preferable to use a material having a low content of inorganic impurities such as metal cation chloride (for example, sodium chloride) and sulfate (for example, sodium sulfate). ..
  • the standard of the content of inorganic impurities is about 1% or less with respect to the total mass of carbon black, and the lower limit can be set to the detection limit of the analytical instrument, that is, 0%.
  • an ink having a small amount of inorganic impurities for example, a method of purifying the ink with a reverse osmosis membrane; a method of suspending and purifying carbon black in a mixed solvent of C1-C4 alcohol such as methanol and water; And a method of exchanging and adsorbing inorganic impurities in the ink.
  • the pH of the ink according to this embodiment is usually pH 5 to pH 11, preferably pH 7 to pH 10, for the purpose of improving storage stability.
  • the surface tension of the ink according to this embodiment is usually about 10 mN/m to 50 mN/m, preferably about 20 mN/m to 40 mN/m.
  • the viscosity of the ink according to this embodiment is usually 30 mPa ⁇ s or less, preferably 20 mPa ⁇ s or less, and the lower limit is about 0.1 mPa ⁇ s.
  • the ink according to this embodiment can be used in various fields. Examples thereof include aqueous inks for writing, aqueous printing inks, information recording inks, textile printing, and the like. In the field where inkjet recording is possible, it is preferably used as an inkjet ink.
  • the inkjet recording method according to the present embodiment performs recording by ejecting the ink droplets from an inkjet printer and adhering them to a recording medium.
  • the ink nozzles used for recording there is no particular limitation on the ink nozzles used for recording, and it can be selected according to the purpose.
  • the recording method is not particularly limited, and a known method can be used. Examples thereof include a charge control method, a drop-on-demand method (pressure pulse method), an acoustic inkjet method, a thermal inkjet method, and the like.
  • the recording medium is not particularly limited as long as it is a substance that can be colored with ink. Examples thereof include paper, films, fibers or cloths (cellulose, nylon, wool, etc.), leather, substrates for color filters, and the like.
  • the recording medium is roughly classified into a recording medium having an ink receiving layer and a recording medium having no ink receiving layer.
  • Examples thereof include fibers; paper having an ink receiving layer; ink-absorptive or non-ink-absorbing recording media having no ink receiving layer; and the like.
  • the paper having the ink receiving layer a paper for exclusive use of ink jet is mentioned.
  • Examples of the recording medium having poor ink absorbability include plain paper; recording media used for gravure printing, offset printing, etc.; coated paper such as lightly coated paper, art paper, coated paper, matte paper, cast paper, etc. Are listed.
  • Examples of non-ink absorbing recording media include vinyl chloride sheets, polymer sheets, glass and rubber. Among these, a recording medium which does not have an ink receiving layer and is hardly absorbable to ink is preferable.
  • the ink receiving layer is formed, for example, by a method of impregnating or coating a recording medium with a cationic polymer; inorganic fine particles such as porous silica, alumina sol, and special ceramics that can absorb dyes in the ink, polyvinyl alcohol, polyvinyl pyrrolidone, It can be provided by a method of coating the surface of the substrate together with the hydrophilic polymer.
  • the fiber When the recording medium is a fiber, the fiber includes a fiber selected from the group consisting of polyester, cellulose, polyamide, and a natural fiber, and a mixed fiber containing these fibers. These fibers can have an ink receiving layer.
  • the ink receiving layer can be provided on the fiber by a known method. Fibers having an ink receiving layer are commercially available, for example, in the form of cloth. Examples of polyester fibers include polyethylene terephthalate fibers. Examples of the cellulose fibers include fibers of cotton, cotton, rayon, triacetate, diacetate and the like. Examples of polyamide fibers include nylon fibers. Examples of natural fibers include silk and wool.
  • an ink tank containing the above ink is loaded in a predetermined position of an inkjet printer and recording is performed by the above recording method.
  • An ink tank containing the above ink and an inkjet printer provided with the ink tank are also included in the scope of the present invention.
  • full color recording is performed by using together with an ink containing a colorant selected from pigments or dyes such as yellow, blue, red, green, violet and orange.
  • a colorant selected from pigments or dyes such as yellow, blue, red, green, violet and orange.
  • industrial inkjet printers are preferably line-head inkjet printers, and single-pass printing is also preferably performed.
  • ink it is possible to obtain a print image having a high black print density, particularly a high black print density when recorded on a recording medium having no ink receiving layer, even under such printing conditions.
  • the preferable combination of the preferable ones is more preferable, and the preferable combination of the preferable ones is further preferable.
  • the ink is capable of forming minute droplets and has good ejection properties. Further, the redispersibility is good even when the ink is dried, and the wettability with respect to the recording medium is also good. Further, the above ink has good storage stability, and the dispersion state of the carbon black fine particles in the dispersion is also good. Further, the image recorded with the above ink does not cause a mottling phenomenon, and solid filling is good. Further, the image recorded with the above ink has no bleeding and is excellent in scratch resistance.
  • the present invention will be specifically described with reference to Examples, but the present invention is not limited to the following Examples.
  • all the synthetic reactions and operations such as crystallization were carried out under stirring.
  • the pigment solid content in the examples is a conversion value obtained by calculating the content of only the pigment solid content from the measured value obtained by the dry weight method.
  • Example 1 Preparation of ink
  • the dispersant (6 parts) obtained in Synthesis Example 1 was dissolved in 2-butanone (15 parts) to obtain a liquid.
  • a liquid prepared by dissolving 0.45 part of sodium hydroxide in ion-exchanged water (60 parts) was added to this liquid, and the mixture was stirred for 1 hour to prepare an emulsion.
  • This emulsion and NEROX 605 (20 parts) were placed in a sand grinder and dispersed for 10 hours at 1500 rpm to obtain a liquid.
  • Ion-exchanged water (100 parts) was added dropwise to the obtained solution, followed by filtration with a glass fiber filter (GA-100 manufactured by ADVANTEC) to obtain a filtrate.
  • the obtained filtrate was put in an evaporator, 2-butanone and a part of water were distilled off under reduced pressure, and ion-exchanged water was added so that the pigment concentration became 12% to obtain a dispersion liquid.
  • 1,2-hexanediol (5 parts), Resin 1 (3 parts) obtained in Synthesis Example 2, propylene glycol (20 parts), BYK-349 (0.5 parts), and triethanolamine were added to the resulting dispersion. (0.5 parts), Proxel GXL(s) and water to make a total amount of 100 parts were stirred for about 1 hour, and then filtered with a membrane filter having a pore size of 3 ⁇ m to obtain the ink of Example 1. It was The ink was prepared so that the carbon black content in the ink was 5%.
  • Example 2 to 10 and Comparative Examples 1 to 3 Preparation of Ink
  • Inks of Examples 2 to 10 and Comparative Examples 1 to 3 were prepared in the same manner as in Example 1 except that the compositions shown in Tables 1 and 2 below were used. The content of carbon black in each ink was adjusted to 5%, which is the same as in Example 1.

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Inks, Pencil-Leads, Or Crayons (AREA)
  • Ink Jet Recording Methods And Recording Media Thereof (AREA)
  • Ink Jet (AREA)

Abstract

L'invention concerne une encre qui contient du noir de carbone, un agent de dispersion, un solvant organique, une résine et de l'eau. La surface spécifique BET du noir de carbone est de 80 m2/g ou plus. Le coefficient de partage eau/octanol du solvant organique n'est pas inférieur à -0,05 et est inférieur à 3,50. La résine est un composé qui est différent de l'agent de dispersion et qui a une valeur acide supérieure à 0 mg KOH/g et inférieure à 100 mg KOH/g. L'invention concerne également : un procédé d'impression à jet d'encre qui utilise l'encre ; des supports d'impression sur lesquels l'encre est collée ; un réservoir d'encre qui contient l'encre ; et une imprimante à jet d'encre pourvue du réservoir d'encre.
PCT/JP2020/003047 2019-02-06 2020-01-28 Encre, procédé d'impression à jet d'encre, et appareil d'impression WO2020162270A1 (fr)

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WO2023112816A1 (fr) * 2021-12-13 2023-06-22 日本化薬株式会社 Composition d'encre et procédé d'enregistrement au jet d'encre
WO2023176899A1 (fr) * 2022-03-18 2023-09-21 三菱ケミカル株式会社 Composition de résine photosensible, dispersion de pigment, produit durci, matrice noire et dispositif d'affichage d'image
JP7408585B2 (ja) 2019-02-06 2024-01-05 日本化薬株式会社 インク、インクジェット記録方法及び記録メディア

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JP2016145336A (ja) 2015-01-29 2016-08-12 キヤノン株式会社 インクセット及びインクジェット記録方法
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WO2020162270A1 (fr) 2019-02-06 2020-08-13 日本化薬株式会社 Encre, procédé d'impression à jet d'encre, et appareil d'impression

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JP2010285476A (ja) * 2009-06-09 2010-12-24 Canon Inc インクジェット記録用顔料インクの製造方法及びインクジェット記録用顔料インク
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JP7408585B2 (ja) 2019-02-06 2024-01-05 日本化薬株式会社 インク、インクジェット記録方法及び記録メディア
WO2023112816A1 (fr) * 2021-12-13 2023-06-22 日本化薬株式会社 Composition d'encre et procédé d'enregistrement au jet d'encre
WO2023176899A1 (fr) * 2022-03-18 2023-09-21 三菱ケミカル株式会社 Composition de résine photosensible, dispersion de pigment, produit durci, matrice noire et dispositif d'affichage d'image

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