WO2022201667A1 - 洗浄液、インクセット、及び洗浄方法 - Google Patents
洗浄液、インクセット、及び洗浄方法 Download PDFInfo
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- WO2022201667A1 WO2022201667A1 PCT/JP2021/045935 JP2021045935W WO2022201667A1 WO 2022201667 A1 WO2022201667 A1 WO 2022201667A1 JP 2021045935 W JP2021045935 W JP 2021045935W WO 2022201667 A1 WO2022201667 A1 WO 2022201667A1
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- mass
- water
- cleaning liquid
- compound
- alkali
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Classifications
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- 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
-
- 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
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
- C11D1/66—Non-ionic compounds
- C11D1/72—Ethers of polyoxyalkylene glycols
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/0005—Other compounding ingredients characterised by their effect
- C11D3/0047—Other compounding ingredients characterised by their effect pH regulated compositions
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/16—Organic compounds
- C11D3/26—Organic compounds containing nitrogen
- C11D3/28—Heterocyclic compounds containing nitrogen in the ring
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/48—Medical, disinfecting agents, disinfecting, antibacterial, germicidal or antimicrobial compositions
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- 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
- B41J2/135—Nozzles
- B41J2/165—Prevention or detection of nozzle clogging, e.g. cleaning, capping or moistening for nozzles
- B41J2/16517—Cleaning of print head nozzles
- B41J2/16552—Cleaning of print head nozzles using cleaning fluids
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- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D2111/00—Cleaning compositions characterised by the objects to be cleaned; Cleaning compositions characterised by non-standard cleaning or washing processes
- C11D2111/10—Objects to be cleaned
- C11D2111/14—Hard surfaces
- C11D2111/20—Industrial or commercial equipment, e.g. reactors, tubes or engines
Definitions
- the present invention relates to a cleaning liquid, an ink set, and a cleaning method.
- Patent Documents 1 to 6 In an inkjet printer that ejects water-based inkjet ink containing a pigment and an alkali-soluble resin, there is known a cleaning liquid for cleaning a portion to which the ejected water-based inkjet ink adheres (Patent Documents 1 to 6).
- the cleaning liquid contains preservatives (Patent Documents 1-2) to prevent the growth of mold and the like, and sorbitol, 1,3-bis(2- Hydroxyethyl)-5,5-dimethyl-2,4-imidazolidinedione and other deliquescent agents are known (Patent Documents 3 to 6).
- a nozzle plate having a plurality of ejection openings for ejecting ink is usually provided at the site for ejecting the water-based inkjet ink (Patent Document 7).
- the nozzle plate of the inkjet printer as described above usually has a metal oxide or nitride on the surface to prevent erosion by the ink.
- the cleaning liquid containing a large amount of deliquescence agent such as 1,3-bis(2-hydroxyethyl)-5,5-dimethyl-2,4-imidazolidinedione is not used as the cleaning liquid. Therefore, there is a problem that the water repellency of the plate is lowered and the storage stability of the cleaning solution is lowered.
- the present invention relates to an inkjet printer that ejects an aqueous inkjet ink containing a pigment and an alkali-soluble resin. and water, the surfactant is a compound having a polyoxyalkylene skeleton and an HLB of 9 to 20, the antiseptic agent comprises a compound having a hydantoin skeleton, and has the hydantoin skeleton.
- the proportion of the compound relates to the cleaning liquid being 0.05-0.3% by weight in the cleaning liquid.
- the present invention also relates to an ink set having an aqueous inkjet ink containing the cleaning liquid, a pigment, and an alkali-soluble resin.
- the present invention also relates to a cleaning method for supplying the cleaning liquid to a portion to which the ejected aqueous inkjet ink adheres, in an inkjet printer that ejects aqueous inkjet ink containing a pigment and an alkali-soluble resin.
- the cleaning liquid of the present invention contains a surfactant, an antiseptic, and water, the surfactant is a compound having a polyoxyalkylene skeleton and an HLB of 9 to 20, and the antiseptic is A compound having a hydantoin skeleton is included, and the ratio of the compound having the hydantoin skeleton is 0.05 to 0.3% by mass in the cleaning liquid. Since the above compound having a polyoxyalkylene skeleton and an HLB of 9 to 20 is excellent in water solubility, the cleaning liquid of the present invention has good storage stability.
- the cleaning liquid of the present invention is a cleaning liquid for cleaning the site to which the ejected aqueous inkjet ink adheres in an inkjet printer that ejects an aqueous inkjet ink containing a pigment and an alkali-soluble resin, and includes a surfactant and an antiseptic. and water, the surfactant contains a compound having a polyoxyalkylene skeleton and an HLB of 9 to 20, the preservative contains a compound having a hydantoin skeleton, and has the hydantoin skeleton. The proportion of the compound is 0.05-0.3% by mass in the cleaning liquid.
- the proportion of the surfactant is preferably 0.05% by mass or more, more preferably 0.1% by mass or more, from the viewpoint of ensuring cleaning performance for inks of various compositions in the cleaning liquid. is more preferable, and from the viewpoint of ensuring the stability of the cleaning liquid over time, it is preferably 1% by mass or less, and more preferably 0.8% by mass or less.
- the antiseptic agent contains a compound having a hydantoin skeleton.
- the compound having a hydantoin skeleton can be used without particular limitation as long as it has antiseptic properties, and is preferably water-soluble from the viewpoint of dissolving in a cleaning liquid.
- Examples of the compound having a hydantoin skeleton include 1,3-bis(2-hydroxyethyl)-5,5-dimethyl-2,4-imidazolidinedione, 1,3-dibromo-5,5-dimethylhydantoin, 1,3-dichloro-5,5-dimethylhydantoin, bromochloro-5,5-dimethylhydantoin and the like.
- the preservatives may be used alone or in combination of two or more.
- said "water-soluble" is a compound which can dissolve 5 mass parts or more with respect to 100 mass parts of water of 25 degreeC.
- the ratio of the compound having the hydantoin skeleton is 0.05 to 0.3% by mass in the cleaning liquid.
- the ratio of the compound having a hydantoin skeleton is preferably 0.08% by mass or more, more preferably 0.1% by mass or more, from the viewpoint of ensuring good detergency in the cleaning solution, and From the viewpoint of ensuring the stability of the cleaning liquid over time, the content is preferably 0.25% by mass or less, more preferably 0.2% by mass or less.
- the antiseptic agent may further contain an antiseptic agent other than the compound having a hydantoin skeleton, from the viewpoint of enhancing the antiseptic effect.
- antiseptics include carbamates such as propynyl iodide butylcarbamate; isothiazolines such as 1,2-benzisothiazolin-3-one; pyrithiones such as sodium pyrithione; benzimidazoles such as thiabendazole; is mentioned.
- the proportion of the water-soluble antiseptic in the cleaning liquid is preferably 0.001% by mass or more, more preferably 0.005% by mass or more, from the viewpoint of ensuring good detergency. From the viewpoint of ensuring the stability over time, the content is preferably 0.1% by mass or less, more preferably 0.05% by mass or less.
- the ratio of the antiseptic (the total of the compound having a hydantoin skeleton and the antiseptic other than the compound) is preferably 0.05% by mass or more in the cleaning liquid from the viewpoint of ensuring good cleaning performance. It is more preferably 1% by mass or more, and from the viewpoint of ensuring the stability of the cleaning liquid over time, it is preferably 0.3% by mass or less, more preferably 0.25% by mass or less, and 0 0.2% by mass or less is more preferable.
- the proportion of water in the cleaning liquid is preferably 60% by mass or more, more preferably 70% by mass or more, from the viewpoint of making the cleaning liquid have a low viscosity. From the viewpoint, it is preferably 99.9% by mass or less, more preferably 99.5% by mass or less.
- the cleaning liquid may contain a moisturizing agent from the viewpoint of suppressing evaporation of water in the cleaning liquid.
- a moisturizing agent examples include media that are one or more selected from the group consisting of polyalkylene glycol, alkylene glycol, and glycerin.
- the moisturizing agents may be used alone or in combination of two or more.
- polyalkylene glycol examples include polyethylene glycol and polypropylene glycol.
- alkylene glycol examples include ethylene glycol, propylene glycol, butylene glycol, diethylene glycol, dipropylene glycol, triethylene glycol, tripropylene glycol, 1,2,6-hexanetriol, thiodiglycol, and 1,3-butanediol. , 1,5-pentanediol and the like.
- propylene glycol, diethylene glycol, and glycerin are preferable because the humectant exhibits an effect of being excellent in suppressing moisture evaporation.
- the ratio of the moisturizing agent in the cleaning liquid is preferably 5% by mass or more, more preferably 10% by mass or more, from the viewpoint of ensuring moisturizing properties. From the viewpoint of ensuring the stability over time, the content is preferably 40% by mass or less, more preferably 30% by mass or less.
- the cleaning liquid preferably has a pH of 5 or more, more preferably 6 or more, from the viewpoint of preventing rust on printer members, and has a pH of 12 from the viewpoint of preventing corrosion of adhered parts of the printer. is preferably 9 or less, more preferably 9 or less.
- the cleaning liquid may contain an organic solvent, an antifoaming agent, etc., if necessary.
- the amount of the organic solvent, which may damage the components of the water-based inkjet printer be limited so as not to damage the components, and more preferably not be added.
- the method for preparing the cleaning liquid is not particularly limited, and all of the above components may be mixed to form a single agent. , may be doubled.
- the viscosity of the washing liquid at 25°C should be 5 cps or less, preferably in the range of 1 to 3 cps.
- the viscosity can be measured, for example, with an E-type viscometer (trade name “RE100L type viscometer”, manufactured by Toki Sangyo Co., Ltd.).
- the ink set of the present invention has a water-based inkjet ink containing the washing liquid, a pigment, and an alkali-soluble resin.
- organic pigments and inorganic pigments used in water-based inkjet inks can be used without particular limitation.
- the organic pigment include dye lake pigments, azo pigments, benzimidazolone pigments, phthalocyanine pigments, quinacridone pigments, anthraquinone pigments, dioxazine pigments, indigo pigments, thioindico pigments, perylene pigments, Perinone pigments, diketopyrrolopyrrole pigments, isoindolinone pigments, nitro pigments, nitroso pigments, lavanthrone pigments, quinophthalone pigments, pyranthrone pigments, indanthrone pigments, and the like.
- the inorganic pigments include carbon black, titanium oxide, zinc white, red iron oxide, graphite, iron black, chromium oxide green, and aluminum hydroxide.
- the pigment may be surface-treated with a known surface-treating agent.
- the pigments may be used alone or in combination of two or more.
- the alkali-soluble resin preferably further has a hydrophobic portion in its molecule, mainly for improving adsorption to pigments.
- Hydrophobic moieties to be introduced into the molecule include, for example, hydrophobic groups such as long-chain alkyl groups, alicyclic and aromatic cyclic hydrocarbon groups.
- the acid value of the alkali-soluble resin is preferably 40 mgKOH/g or more, more preferably 70 mgKOH/g or more, from the viewpoint of increasing the solubility in an aqueous medium. Moreover, the acid value of the alkali-soluble resin is preferably 300 mgKOH/g or less, more preferably 250 mgKOH/g or less, from the viewpoint of improving the water resistance of printed matter.
- the acid value was obtained by arithmetically determining the number of mg of potassium hydroxide theoretically required to neutralize 1 g of the alkali-soluble resin, based on the composition of the monomers used for synthesizing the alkali-soluble resin. Theoretical acid number.
- the glass transition temperature of the alkali-soluble resin is preferably 0°C or higher, more preferably 10°C or higher, from the viewpoint of improving the blocking resistance of the printed matter.
- the glass transition temperature of the alkali-soluble resin is preferably 100° C. or lower, more preferably 80° C. or lower, from the viewpoint of improving the bending resistance of printed matter.
- the glass transition temperature of the alkali-soluble resin is the theoretical glass transition temperature obtained by thermal analysis when the alkali-soluble resin is other than an acrylic copolymer resin.
- a method of thermal analysis according to JIS K7121 (method for measuring the transition temperature of plastics), as an example, using a Pyris1 DSC manufactured by PerkinElmer, a temperature increase rate of 20 ° C./min and a nitrogen gas flow rate of 20 ml/min.
- the glass transition temperature can be measured at
- the weight-average molecular weight of the alkali-soluble resin is preferably 5,000 or more, more preferably 10,000 or more, from the viewpoint of improving the water resistance of printed matter.
- the weight-average molecular weight of the alkali-soluble resin is preferably 100,000 or less, more preferably 50,000 or less, from the viewpoint of enhancing solubility in aqueous media.
- the weight average molecular weight can be measured by a gel permeation chromatography (GPC) method.
- GPC gel permeation chromatography
- Water 2690 manufactured by Waters
- PLgel 5 ⁇
- MIXED-D manufactured by Polymer Laboratories
- tetrahydrofuran as a developing solvent
- column temperature 25 ° C. flow rate 1 ml / min
- RI Chromatography is performed under the conditions of a detector, a sample injection concentration of 10 mg/ml, and an injection amount of 100 microliters, and the polystyrene equivalent weight average molecular weight can be obtained.
- alkali-soluble resin examples include acrylic copolymer resins, maleic acid copolymer resins, polyester resins obtained by polycondensation reaction, and polyurethane resins. Materials for synthesizing such alkali-soluble resins are disclosed, for example, in Japanese Unexamined Patent Application Publication No. 2000-94825. Maleic acid-based copolymer resins, polyester-based resins, polyurethane-based resins, and the like can be used. Furthermore, resins obtained using materials other than these can also be used. The said alkali-soluble resin can be used individually or in combination of 2 or more types.
- acrylic copolymer resin for example, a mixture of an anionic group-containing monomer and another copolymerizable monomer may be mixed with a usual radical generator (for example, benzoyl peroxide, tertiary butyl peroxybenzoate, Azobisisobutyronitrile, etc.) can be used that is obtained by polymerization in a solvent.
- a radical generator for example, benzoyl peroxide, tertiary butyl peroxybenzoate, Azobisisobutyronitrile, etc.
- anionic group-containing monomer examples include monomers having at least one anionic group selected from the group consisting of a carboxyl group, a sulfonic acid group, and a phosphonic acid group.
- Group-bearing monomers are particularly preferred.
- Examples of the monomer having a carboxyl group include acrylic acid, methacrylic acid, crotonic acid, itaconic acid, maleic acid, fumaric acid, 2-carboxyethyl (meth)acrylate, 2-carboxypropyl (meth)acrylate, anhydrous Maleic acid, fumaric anhydride, maleic acid half ester and the like can be mentioned.
- Examples of the monomer having a sulfonic acid group include sulfoethyl methacrylate.
- Examples of the monomer having a phosphonic acid group include phosphonoethyl methacrylate.
- the other monomer copolymerizable with the anionic group-containing monomer preferably contains a hydrophobic group-containing monomer from the viewpoint of improving the adsorptivity with the pigment.
- hydrophobic group-containing monomers examples include, for example, monomers having a long-chain alkyl group, alkyl esters having 8 or more carbon atoms of a radically polymerizable unsaturated carboxylic acid such as (meth)acrylic acid (e.g.
- monomers having an aromatic hydrocarbon group include styrene-based monomers such as benzyl (meth)acrylate, styrene, ⁇ -methylstyrene and vinyltoluene.
- the hydrophobic group-containing monomers may be used alone or in combination of two or more.
- Other monomers copolymerizable with the anionic group-containing monomer may include hydrophilic group-containing monomers from the viewpoint of suppressing aggregation of the alkali-soluble resin in the aqueous medium.
- hydrophilic group-containing monomer examples include monomers having a (poly)oxyalkylene chain, such as methoxypolyethylene glycol, methoxypolyethylenepolypropyleneglycol, ethoxypolyethyleneglycol, ethoxypolyethylenepolypropyleneglycol, propoxypolyethyleneglycol, and propoxypolyethylene.
- monomers having a (poly)oxyalkylene chain such as methoxypolyethylene glycol, methoxypolyethylenepolypropyleneglycol, ethoxypolyethyleneglycol, ethoxypolyethylenepolypropyleneglycol, propoxypolyethyleneglycol, and propoxypolyethylene.
- Esterification products of single-terminal alkyl-blocked (poly)alkylene glycols such as polypropylene glycol and radically polymerizable unsaturated carboxylic acids such as (meth)acrylic acid, and radically polymerizable unsaturated carboxylic acids such as (meth)acrylic acid ethylene oxide adducts and/or propylene oxide adducts; basic group-containing monomers such as vinylpyrrolidones such as 1-vinyl-2-pyrrolidone and 1-vinyl-3-pyrrolidone; 2-vinylpyridine; -Vinylpyridines such as vinylpyridine, 5-methyl-2-vinylpyridine, 5-ethyl-2-vinylpyridine, vinylimidazoles such as 1-vinylimidazole, 1-vinyl-2-methylimidazole, 3-vinylpiperidine , vinyl biperidines such as N-methyl-3-vinylpiperidine, dimethylaminoethyl (me
- a monomer having a hydroxyl group for example, hydroxyethyl (meth)acrylate, hydroxyalkyl esters of (meth)acrylic acid such as hydroxypropyl (meth)acrylate;
- a monomer having an epoxy group for example, glycidyl (Meth)acrylate and the like.
- the hydrophilic group-containing monomers may be used alone or in combination of two or more.
- copolymerizable monomers other than the hydrophobic group-containing monomer and the hydrophilic group-containing monomer include, for example, methyl (meth)acrylate, ethyl (meth)acrylate, (meth) Examples include alkyl esters of (meth)acrylic acid having less than 8 carbon atoms, such as propyl acrylate, isopropyl (meth)acrylate, butyl (meth)acrylate, and hexyl (meth)acrylate.
- the hydrophobic group-containing monomer and other copolymerizable monomers other than the hydrophilic group-containing monomer can be used alone or in combination of two or more.
- the water-based inkjet ink may use a surfactant.
- a surfactant used in water-based inkjet ink can be used, and examples thereof include nonionic surfactants, cationic surfactants, anionic surfactants, and betaine surfactants.
- Specific examples of the surfactant include silicone-based surfactants, fluorine-based surfactants, acetylene-based surfactants, and the like. The said surfactant can be used individually or in combination of 2 or more types.
- the water-based inkjet ink may use a water-soluble solvent.
- a water-soluble solvent known water-soluble solvents used in water-based inkjet inks can be used. Examples include lower alcohols such as ethanol and propanol; polyhydric alcohols such as glycerin; (poly)ethylene glycol, (poly) Examples thereof include (poly)alkylene glycol such as propylene glycol and alkyl ethers thereof.
- the water-soluble solvents can be used alone or in combination of two or more.
- the proportion of the pigment in the water-based inkjet ink of the present invention is preferably 1% by mass or more, more preferably 2% by mass or more, from the viewpoint of improving the print density of the printed matter, and is effective in improving ejection stability. is preferably 10% by mass or less, more preferably 8% by mass or less, from the viewpoint of improving the However, when the pigment is a white pigment, the proportion of the white pigment in the water-based inkjet ink of the present invention is preferably 4% by mass or more, more preferably 8% by mass or more, and 30% by mass or more. It is preferably 20% by mass or less, more preferably 20% by mass or less.
- the content of the alkali-soluble resin is preferably 5 parts by mass or more, more preferably 15 parts by mass or more, relative to 100 parts by mass of the pigment.
- the content of the alkali-soluble resin is preferably 100 parts by mass or less, more preferably 80 parts by mass or less, relative to 100 parts by mass of the pigment. It is preferably 60 parts by mass or less, and more preferably 60 parts by mass or less.
- the proportion of the surfactant in the water-based inkjet ink is 0.1% by mass or more from the viewpoint of improving dot spreadability and solid uniformity of printed matter. It is preferably 0.5% by mass or more, more preferably 0.5% by mass or more, and from the viewpoint of improving storage stability, it is preferably 3% by mass or less, more preferably 2% by mass or less.
- the proportion of the water-soluble solvent in the water-based inkjet ink is preferably 15% by mass or more, more preferably 20% by mass, from the viewpoint of improving ejection stability.
- the content is preferably 60% by mass or less, and more preferably 50% by mass or less.
- the proportion of water in the water-based inkjet ink is preferably 40% by mass or more, more preferably 50% by mass or more, from the viewpoint of improving the drying property of the coating film, and also improves the ejection stability. From the viewpoint, it is preferably 70% by mass or less, more preferably 60% by mass or less.
- the water-based inkjet ink preferably contains a basic compound.
- the basic compound include inorganic basic compounds such as sodium hydroxide and potassium hydroxide; ammonia, methylamine, ethylamine, monoethanolamine, N,N-dimethylethanolamine, N,N-diethylethanolamine, organic basic compounds such as N,N-dibutylethanolamine, diethanolamine, N-methyldiethanolamine, triethanolamine, morpholine, N-methylmorpholine, N-ethylmorpholine;
- the said basic compound can be used individually or in combination of 2 or more types.
- the proportion of the basic compound in the water-based inkjet ink may be an amount that dissolves the alkali-soluble resin in the medium, but is usually 0.05% by mass from the viewpoint of enhancing the dispersion stability of the alkali-soluble resin. It is preferably 0.1% by mass or more, more preferably 0.1% by mass or more, and from the viewpoint of increasing the water resistance of printed matter, it is preferably 1% by mass or less, and 0.5% by mass or less. is more preferred.
- the water-based inkjet ink may further contain known resins, resin emulsions, wax emulsions, pigment dispersants, anti-mold agents, anti-corrosion agents, thickeners, antioxidants, UV absorbers, and preservative agents, depending on the purpose. Additives such as agents, antifoaming agents, and pH adjusters can be added.
- the method for preparing (manufacturing) the water-based inkjet ink is not particularly limited, and the above components may be added in order or at the same time and mixed.
- the above components may be added in order or at the same time and mixed.
- the pigment is dispersed using various dispersing machines such as ball mills, attritors, roll mills, sand mills, agitator mills, etc.
- the aqueous inkjet ink has an initial viscosity after production of 2.0 to 15.0 mPa ⁇ s, preferably 3.0 to 12.0 mPa ⁇ s at 25°C.
- the viscosity can be measured, for example, with an E-type viscometer (trade name “RE100L type viscometer”, manufactured by Toki Sangyo Co., Ltd.).
- the cleaning method of the present invention is a method of supplying the cleaning liquid to a portion to which the ejected aqueous inkjet ink adheres in an inkjet printer that ejects aqueous inkjet ink containing a pigment and an alkali-soluble resin.
- the supply of the cleaning liquid to the site where the water-based inkjet ink adheres may be separately supplied to the deposition site, or may be supplied to the deposition site in a pre-mixed state.
- a nozzle plate having a plurality of ejection openings for ejecting ink is usually provided in the inkjet printer where the inkjet ink is ejected, but the cleaning liquid of the present invention does not damage the silicon nozzle plate. Therefore, it is suitable for inkjet printers having such silicon nozzle plates.
- Alkali-soluble resin acrylic acid/n-butyl acrylate/benzyl methacrylate/styrene copolymer
- weight average molecular weight 30,000 acid value 185 mgKOH/g, glass transition temperature 40° C.
- Examples 1 to 13 Comparative Examples 1 to 11> ⁇ Preparation of washing solution>
- each raw material was charged in a beaker and stirred and mixed with a stirrer to prepare cleaning solutions for each example and each comparative example.
- the cleaning solutions of Examples had a pH of 6.5 to 8.5 and a viscosity of about 1.0 to 1.8 cps at 25°C.
- ⁇ Storage stability> Each of the washing liquids obtained above was placed in a glass bottle, and the viscosity (mPa ⁇ s) at 25° C. was measured using a viscometer (“RE100L type” manufactured by Toki Sangyo Co., Ltd.). Then, it was sealed and stored at 60°C for 1 month, and the viscosity (25°C) after storage was measured with a viscometer. Storage stability was evaluated by viscosity change rate (60° C., (viscosity after 1 month ⁇ viscosity before storage)/viscosity before storage). [Evaluation criteria] ⁇ : Viscosity change rate is less than 5%. ⁇ : Viscosity change rate is 5% or more and less than 10%. x: The additive is separated and non-uniform.
- Inkjet printer PX-105 (manufactured by Seiko Epson) is filled with the above water-based inkjet ink, and solid printing is performed on 10 sheets of A4 size paper continuously. After confirming that the ink is filled, the ink is recorded. The head was left in an oven at 50° C. for 3 months. After leaving the printer unattended, a nozzle check print was performed, and multiple nozzles that failed to eject ink were found (pins missing). This recording head was filled with the cleaning liquid obtained above in the initial filling mode, and the cleaning performance with respect to the water-based inkjet ink was evaluated.
- Emulgen 1150S-60 is polyoxyethylene alkyl ether (manufactured by Kao, HLB19); Rhodol TW-L120 is: Polyoxyethylene sorbitan monolaurate (manufactured by Kao, HLB17); Nymeen S-220 is polyoxyethylene stearylamine (manufactured by NOF, HLB15); Surfynol 465 is a polyoxyethylene acetylenic glycol ether (manufactured by EVONIK, HLB13); KF-355A is a polyether-modified silicone (manufactured by Shin-Etsu Chemical Co., Ltd., HLB12); DOWSI FZ-2104 Fluid is a polyether modified silicone (manufactured by DOW, HLB9); Surfynol 440 is a polyoxyethylene acetylenic glycol ether (manufactured by EVONIK, HLB8); Unisafe 10P-8 is polyoxyethylene alkyl
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- Chemical Kinetics & Catalysis (AREA)
- Oil, Petroleum & Natural Gas (AREA)
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Abstract
Description
前記界面活性剤は、ポリオキシアルキレン骨格を有し、かつHLBが9~20である化合物である。ここで、HLB値とは、グリフィン法によって算出される界面活性剤の親水性と親油性の程度を表す指標であり、HLB値が小さいほど親油性が高く、HLB値が大きいほど親水性が高いことを示す。前記界面活性剤は単独で、又は2種以上を組み合わせて使用することができる。
前記防腐剤は、ヒダントイン骨格を有する化合物を含む。前記ヒダントイン骨格を有する化合物は、防腐性能があれば特に制限なく使用でき、洗浄液に溶解する観点から、水溶性であることが好ましい。前記ヒダントイン骨格を有する化合物としては、例えば、1,3-ビス(2-ヒドロキシエチル)-5,5-ジメチル-2,4-イミダゾリジンジオン、1,3-ジブロモ-5,5-ジメチルヒダントイン、1,3-ジクロロ-5,5-ジメチルヒダントイン、ブロモクロロ-5,5-ジメチルヒダントイン等が挙げられる。前記防腐剤は単独で、又は2種以上を組み合わせて使用することができる。なお、上記の「水溶性」とは、25℃の水100質量部に対して5質量部以上溶解できる化合物である。
前記水としては、例えば、イオン交換水、純水、蒸留水、工業用水等が挙げられる。前記水は単独で、又は2種以上を組み合わせて使用することができる。
本発明のインクセットは、前記洗浄液、及び顔料とアルカリ可溶性樹脂を含む水性インクジェットインクを有する。
前記顔料は、水性インクジェットインクに使用される有機顔料や無機顔料を特に制限なく使用することができる。前記有機顔料としては、例えば、染料レーキ顔料、アゾ系顔料、ベンズイミダゾロン系顔料、フタロシアニン系顔料、キナクリドン系顔料、アントラキノン系顔料、ジオキサジン系顔料、インジゴ系顔料、チオインジコ系顔料、ペリレン系顔料、ペリノン系顔料、ジケトピロロピロール系顔料、イソインドリノン系顔料、ニトロ系顔料、ニトロソ系顔料、ラバンスロン系顔料、キノフタロン系顔料、ピランスロン系顔料、インダンスロン系顔料等が挙げられる。また、前記無機顔料としては、例えば、カーボンブラック、酸化チタン、亜鉛華、ベンガラ、黒鉛、鉄黒、酸化クロムグリーン、水酸化アルミニウム等が挙げられる。前記顔料は、公知の表面処理剤により表面処理されたものであってもよい。前記顔料は単独で、又は2種以上を組み合わせて使用することができる。
前記アルカリ可溶性樹脂は、通常のインクや塗料の顔料分散用やバインダーとして利用できるアルカリ可溶性樹脂であって、塩基性化合物の存在下で水性媒体中に溶解できるものであれば特に制限はないが、カルボキシル基、スルホン酸基、ホスホン酸基(-P(=O)(OH2))等のアニオン性基の1種又は2種以上を含有する樹脂が好ましい。
Woodの式:1/Tg=W1/Tg1+W2/Tg2+W3/Tg3+・・・・・+Wx/Tgx
[式中、Tg1~Tgxはアルカリ可溶性樹脂を構成する単量体1、2、3・・・xのそれぞれの単独重合体のガラス転移温度、W1~Wxは単量体1、2、3・・・xのそれぞれの重合分率、Tgは理論ガラス転移温度を表す。ただし、woodの式におけるガラス転移温度は絶対温度である。]
前記水性インクジェットインクは、界面活性剤を使用することができる。前記界面活性剤は、水性インクジェットインクに使用される公知の界面活性剤を使用でき、例えば、ノニオン界面活性剤、カチオン界面活性剤、アニオン界面活性剤、ベタイン界面活性剤が挙げられる。前記界面活性剤の具体例としては、例えば、シリコーン系界面活性剤、フッ素系界面活性剤、アセチレン系界面活性剤等が挙げられる。前記界面活性剤は単独で、または2種以上を組み合わせて使用することができる。
前記水性インクジェットインクは、水溶性溶剤を使用することができる。前記水溶性溶剤は、水性インクジェットインクに使用される公知の水溶性溶剤を使用でき、例えば、エタノール、プロパノール等の低級アルコール類;グリセリン等の多価アルコール類;(ポリ)エチレングリコール、(ポリ)プロピレングリコール等の(ポリ)アルキレングリコールとそのアルキルエーテル類等が挙げられる。前記水溶性溶剤は、単独で、または2種以上を組み合わせて使用することができる。
前記水性インクジェットインクには、アルカリ可溶性樹脂を溶解させる観点から、塩基性化合物を含むことが好ましい。前記塩基性化合物としては、例えば、水酸化ナトリウム、水酸化カリウム等の無機塩基性化合物;アンモニア、メチルアミン、エチルアミン、モノエタノールアミン、N、N-ジメチルエタノールアミン、N、N-ジエチルエタノールアミン、N、N-ジブチルエタノールアミン、ジエタノールアミン、N-メチルジエタノールアミン、トリエタノールアミン、モルホリン、N-メチルモルホリン、N-エチルモルホリン等の有機塩基性化合物等が挙げられる。前記塩基性化合物は単独で、又は2種以上を組み合わせて使用することができる。
前記水性インクジェットインクを調製(製造)する方法としては、特に限定されず、上記の成分を順番に、あるいは同時に添加して、混合すればよいが、例えば、(1)前記塩基性化合物の存在下にアルカリ可溶性樹脂を水に溶解した水性樹脂ワニス、顔料、必要に応じて顔料分散剤等を混合した後、各種分散機、例えばボールミル、アトライター、ロールミル、サンドミル、アジテーターミル等を利用して顔料分散液(インクベース)を調製し、さらに残りの材料を添加して、水性インクジェットインクを調製する方法や、(2)上記の方法で顔料を分散した後、酸析法や再公表特許WO2005/116147号公報に記載のイオン交換手段等により、顔料表面にアルカリ可溶性樹脂を析出させた樹脂被覆顔料を得、次いで得られた樹脂被覆顔料を塩基性化合物で中和し、各種分散機(高速攪拌装置等)を用いて水に再分散し、さらに残りの材料を添加して、水性インクジェットインクを調製する方法等が挙げられる。
本発明の洗浄方法は、顔料とアルカリ可溶性樹脂を含む水性インクジェットインクを吐出するインクジェットプリンターにおいて、吐出される前記水性インクジェットインクが付着する部位に、前記洗浄液を供給する方法である。水性インクジェットインクが付着する部位への洗浄液の供給は、付着部位に別々に供給されてもよく、予め混合された状態で付着部位に供給されてもよい。
<顔料分散液(ブラックインクベース)の製造>
アルカリ可溶性樹脂(アクリル酸/n-ブチルアクリレート/ベンジルメタクリレート/スチレン共重合体)、重量平均分子量30,000、酸価185mgKOH/g、ガラス転移温度40℃)20質量部を、水酸化カリウム2.5質量部と水77.5質量部との混合溶液に溶解させて、アルカリ可溶性樹脂の固形分が20質量%の水性樹脂ワニスを得た。次に、上記水性樹脂ワニス23.7質量部に水64.3質量部を加え混合し、顔料分散用樹脂ワニスを調製した。この顔料分散用樹脂ワニスに、更に顔料としてカーボンブラック(商品名「プリンテックス90」、デグサ社製)12質量部を加え、攪拌混合後、湿式サーキュレーションミルで練肉を行い、ブラック顔料分散液(ブラックインクベース)を製造した。
上記ブラック顔料分散液34質量部に、水30質量部、プロピレングリコール35質量部、及びアセチレン系界面活性剤(商品名「サーフィノール465」)を1質量部加え撹拌混合し、水性インクジェットインクを調製した。
<洗浄液の調製>
各実施例及び各比較例において、表1及び2に示される配合に従い、各原料をビーカーに仕込み、攪拌装置で攪拌混合して、各実施例及び各比較例の洗浄液を調製した。実施例の洗浄液のpHは、6.5~8.5であり、25℃での粘度が1.0~1.8cps程度であった。
上記で得られた洗浄液をそれぞれガラス瓶にとり、25℃の粘度(mPa・s)を、粘度計(東機産業社製、「RE100L型」)を用いて測定した。その後、密栓し60℃、1ヵ月保存し、保存後の粘度(25℃)を粘度計により測定した。保存安定性は、粘度変化率(60℃、(1ヵ月後の粘度-保存前の粘度)/保存前の粘度)で評価した。
[評価基準]
○:粘度変化率が5%未満である。
△:粘度変化率が5%以上、10%未満である。
×:添加剤が分離し不均一になっている。
細菌評価:普通寒天培地を使用して培養した細菌培養液を0.6g接種して、上記で得られた洗浄液30gとシャーレ内で混合し、30℃で7日間培養した。
カビ・酵母評価:ポテトデキストロース寒天培地を使用して培養したカビ・酵母懸濁液を0.6g接種して、上記で得られた洗浄液30gとシャーレ内で混合し、28℃で7日間培養した。
その後、各シャーレ内の微生物の残存状態を評価した。
[評価基準]
〇:いずれのシャーレ内でも微生物の増殖がみられない。
△:いずれのシャーレ内でもコロニー数が10個未満である。
×:少なくとも1シャーレ内のコロニー数が10個以上である。
インクジェットプリンタPX-105(セイコーエプソン社製)に、上記水性インクジェットインクを充填し、A4サイズの紙に10枚連続でベタ印字を行ってインクが充填されていることを確認した後、インクが記録ヘッドに充填された状態で50℃のオーブンに3ヶ月間放置した。放置後、ノズルチェック印字を行うと、インクの吐出不良が起こるノズルが複数確認された(ピン抜け)。この記録ヘッドに初期充填モードで、上記で得られた洗浄液を充填し、水性インクジェットインクに対する洗浄性について評価した。
[評価基準]
〇:初期充填シーケンスのみで全ノズルが回復し、吐出不良が改善する。
△:クリーニング操作1~3回で全ノズルが回復し、吐出不良が改善する。
×:クリーニング操作を3回以上行ってもピン抜けが起こり、吐出不良が改善されない。
上記で得られた洗浄液に2cm×2cmのシリコン製ノズルプレートを浸漬、60℃、1ヵ月間保存し、保存後のノズルプレートの撥液性を水の接触角にて評価した。
[評価基準]
〇:水の接触角が90°以上である。
△:水の接触角が80°以上、90°未満である。
×:水の接触角が80°未満である。
レオドールTW-L120は、:ポリオキシエチレンソルビタンモノラウレート(花王製、HLB17);
ナイミーンS-220は、ポリオキシエチレンステアリルアミン(日油製、HLB15);
サーフィノール465は、ポリオキシエチレンアセチレニック・グリコールエーテル(EVONIK製、HLB13);
KF-355Aは、ポリエーテル変性シリコン(信越化学工業製、HLB12);
DOWSI FZ-2104 Fluidは、ポリエーテル変性シリコン(DOW製、HLB9);
サーフィノール440は、ポリオキシエチレンアセチレニック・グリコールエーテル、(EVONIK製、HLB8);
ユニセーフ10P-8は、ポリオキシエチレンポリオキシプロピレンセチルエーテル(日油製、HLB8);
KF-352Aは、ポリエーテル変性シリコン(信越化学工業製、HLB7);
DMDMHは、1,3-ビス(2-ヒドロキシエチル)-5,5-ジメチル-2,4-イミダゾリジンジオン;
PROXEL GXLは、1,2-ベンズイソチアゾリン-3-オンを20質量%含む組成物(Lonza社製);を示す。
Claims (7)
- 顔料とアルカリ可溶性樹脂を含む水性インクジェットインクを吐出するインクジェットプリンターにおいて、吐出される前記水性インクジェットインクが付着する部位を洗浄するための洗浄液であり、
界面活性剤と、防腐剤と、水を含み、
前記界面活性剤は、ポリオキシアルキレン骨格を有し、かつHLBが9~20である化合物であり、
前記防腐剤は、ヒダントイン骨格を有する化合物を含み、
前記ヒダントイン骨格を有する化合物の割合は、洗浄液中、0.05~0.3質量%であることを特徴とする洗浄液。 - ポリアルキレングリコール、アルキレングリコール、及びグリセリンからなる群より選ばれる1種以上である保湿剤を含むことを特徴とする請求項1に記載の洗浄液。
- pH調整剤を含むことを特徴とする請求項1又は2に記載の洗浄液。
- 前記ヒダントイン骨格を有する化合物が、1,3-ビス(2-ヒドロキシエチル)-5,5-ジメチル-2,4-イミダゾリジンジオンであることを特徴とする請求項1~3のいずれかに記載の洗浄液。
- 前記防腐剤として、さらに、前記ヒダントイン骨格を有する化合物以外の防腐剤を含むことを特徴とする請求項1~4のいずれかに記載の洗浄液。
- 請求項1~5のいずれかに記載の洗浄液、及び顔料とアルカリ可溶性樹脂を含む水性インクジェットインクを有することを特徴とするインクセット。
- 顔料とアルカリ可溶性樹脂を含む水性インクジェットインクを吐出するインクジェットプリンターにおいて、吐出される前記水性インクジェットインクが付着する部位に、請求項1~5のいずれかに記載の洗浄液を供給することを特徴とする洗浄方法。
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| US18/261,030 US12304209B2 (en) | 2021-03-23 | 2021-12-14 | Cleaning fluid, ink set, and cleaning method |
| CN202180089973.5A CN116723939B (zh) | 2021-03-23 | 2021-12-14 | 清洗液、墨水组、及清洗方法 |
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| JP6952208B1 (ja) * | 2020-09-28 | 2021-10-20 | サカタインクス株式会社 | 水性インクジェット用インク組成物、印刷物、及びインクジェット印刷方法 |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN116723939B (zh) | 2025-09-02 |
| EP4257363C0 (en) | 2025-07-02 |
| JP2022147062A (ja) | 2022-10-06 |
| CA3204939A1 (en) | 2022-09-29 |
| EP4257363A1 (en) | 2023-10-11 |
| EP4257363A4 (en) | 2024-05-29 |
| JP6918263B1 (ja) | 2021-08-11 |
| EP4257363B1 (en) | 2025-07-02 |
| US12304209B2 (en) | 2025-05-20 |
| CN116723939A (zh) | 2023-09-08 |
| US20240059067A1 (en) | 2024-02-22 |
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