WO2021192720A1 - インクジェット記録用インク、及び、画像記録方法 - Google Patents
インクジェット記録用インク、及び、画像記録方法 Download PDFInfo
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- WO2021192720A1 WO2021192720A1 PCT/JP2021/005489 JP2021005489W WO2021192720A1 WO 2021192720 A1 WO2021192720 A1 WO 2021192720A1 JP 2021005489 W JP2021005489 W JP 2021005489W WO 2021192720 A1 WO2021192720 A1 WO 2021192720A1
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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
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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
- C09D11/02—Printing inks
- C09D11/10—Printing inks based on artificial resins
- C09D11/106—Printing inks based on artificial resins containing macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
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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
- C09D11/36—Inkjet printing inks based on non-aqueous solvents
-
- 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 jet recording ink and an image recording method.
- an image recording method for recording an image on a recording medium such as paper based on an image data signal there are recording methods such as an electrophotographic method, a thermal transfer method, and an inkjet recording method.
- Image recording by the inkjet recording method does not require a printing plate, and ink is ejected only to the image recording unit to record the image directly on the recording medium, so that the ink can be used efficiently and the running cost is low. Further, the inkjet recording device is relatively low in cost as compared with other image recording devices, can be miniaturized, and has less noise. As described above, the inkjet recording method has various advantages over other image recording methods.
- Japanese Unexamined Patent Publication No. 2018-204012 describes A-, which is a water-based ink for inkjet containing a pigment, a fixing resin, an organic solvent, and water, wherein the fixing resin comprises a specific A block and a specific B block. It is a B block polymer, and the content of the structural units contained in the A block is 5 to 25 mol% with respect to the total molar amount of the structural units contained in the AB block polymer, and is contained in the A block.
- the content of the structural unit having an anionic functional group is 85 mol% or more based on the total molar amount of the structural unit having an anionic functional group contained in the AB block polymer, and the AB block polymer
- a water-based ink for inkjet having an acid value of 5 to 80 mgKOH / g is described.
- Japanese Patent Application Laid-Open No. 2017-186494 describes an ink composition for inkjet recording, which contains at least a coloring material, a resin, and a specific solvent, and the content of impurities derived from the solvent is a solvent. Ink compositions that are less than 1.0% by weight of the total amount are described.
- Ink used for image recording by the inkjet recording method may be required to have both image quality and ejection performance.
- compatibility between image quality and ejection property is not examined.
- the problem to be solved by the embodiment of the present invention is an ink jet recording ink having excellent graininess and excellent ejection properties, and an image recording method using the inkjet recording ink. Is to provide.
- the present disclosure includes the following aspects.
- Ink for inkjet recording including.
- R 1 independently represents a hydrogen atom or a methyl group
- R 2 independently represents a linear or branched hydrocarbon group having 4 to 9 carbon atoms, or a carbon number of carbon atoms.
- R 3 represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms
- X 1 represents a divalent linking group
- Y 1 represents an anionic group, and among X 1 and Y 1.
- the atom farthest from the main chain is 4 to 27 atoms away from the main chain.
- ⁇ 4> The inkjet according to any one of ⁇ 1> to ⁇ 3>, wherein the content of the silicone-based surfactant is 0.03% by mass to 0.8% by mass with respect to the total mass of the ink.
- the resin further contains 5% by mass to 90% by mass of a structural unit derived from an ethylenically unsaturated compound having an aromatic ring structure or an alicyclic structure with respect to the total mass of the resin.
- An image recording method including a step of applying the inkjet recording ink according to any one of ⁇ 1> to ⁇ 5> onto a recording medium using an inkjet recording method to record an image.
- an inkjet recording ink capable of obtaining an image having excellent graininess and having excellent ejection properties, and an image recording method using the inkjet recording ink are provided.
- the numerical range represented by using “-" means a range including the numerical values before and after "-" as the lower limit value and the upper limit value.
- the amount of each component in the composition means the total amount of the plurality of substances present in the composition when a plurality of substances corresponding to each component are present in the composition, unless otherwise specified. do.
- the upper limit value or the lower limit value described in a certain numerical range may be replaced with the upper limit value or the lower limit value of another numerical range described stepwise. Alternatively, it may be replaced with the value shown in the examples.
- the term "process” is included in this term not only as an independent process but also as long as the intended purpose of the process is achieved even when it cannot be clearly distinguished from other processes.
- the combination of preferred embodiments is a more preferred embodiment.
- "(meth) acrylic” is a concept that includes both acrylic and methacrylic
- “(meth) acrylate” is a concept that includes both acrylate and methacrylate.
- the inkjet recording ink (hereinafter, also simply referred to as “ink”) according to the present disclosure is selected from the group consisting of a pigment, a dispersant, a compound represented by the following formula 1 and a compound represented by the formula 2. 1 mass% to 20 mass% of the organic solvent having a Clog P value of 1.0 to 3.5 and the structural unit represented by the following formula 3 with respect to the total mass of the resin. It contains resin particles containing the contained resin, a silicone-based surfactant, and water.
- R 1 independently represents a hydrogen atom or a methyl group
- R 2 independently represents a linear or branched hydrocarbon group having 4 to 9 carbon atoms, or a carbon number of carbon atoms. It represents 6 to 10 aryl groups, where n represents an integer of 1 to 3.
- R 3 represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms
- X 1 represents a divalent linking group
- Y 1 represents an anionic group, and among X 1 and Y 1.
- the atom farthest from the main chain is 4 to 27 atoms away from the main chain.
- the ink according to the present disclosure contains a silicone-based surfactant, it is difficult for the ink to adhere to the nozzle from which the ink is ejected. Therefore, the ink of the present disclosure is considered to be excellent in ejection property.
- the organic solvent is at least one selected from the group consisting of the compound represented by the following formula 1 and the compound represented by the formula 2, and the ClogP value is 1.0 to 1.
- Landing interference is a phenomenon in which the ink droplets that landed first and the ink droplets that landed later are united. When landing interference occurs, the image density becomes uneven, giving the impression that the image is grainy. The graininess of an image is also called "graininess”. When the ink of the present disclosure is used, landing interference is suppressed, so that an image having excellent graininess can be obtained.
- the ink according to the present disclosure contains a resin in which the resin particles contain 1% by mass to 20% by mass of the structural unit represented by the formula 3 with respect to the total mass of the resin.
- the structural unit represented by the formula 3 is a structural unit derived from a monomer containing an anionic group, and has a relatively long side chain, and thus has high hydrophobicity.
- the hydrophobicity of the structural unit derived from the anionic group-containing monomer is high, the hydrophobicity of the resin particles as a whole becomes high.
- the resin particles contained in the ink droplets are easily fixed on the recording medium, and the impact interference is suppressed.
- the ink of the present disclosure since the resin particles as a whole are highly hydrophobic, the resin particles are less likely to swell, and the ink according to the present disclosure is considered to be excellent in ejection property.
- the ink according to the present disclosure contains a pigment.
- the type of pigment is not particularly limited, and may be either an organic pigment or an inorganic pigment.
- pigments include Seishiro Ito's "Encyclopedia of Pigments” (2000), W.A. Herbst, K. et al.
- examples thereof include pigments described in Hunger “Industrial Organic Pigments", JP-A-2002-12607, JP-A-2002-188025, JP-A-2003-26978 and JP-A-2003-342503.
- the pigment content is preferably 0.5% by mass to 15% by mass, and more preferably 1% by mass to 10% by mass with respect to the total mass of the ink.
- the ink according to the present disclosure contains water.
- the water content is preferably 10% by mass to 99% by mass, more preferably 30% by mass to 80% by mass, and 50% by mass to 70% by mass with respect to the total mass of the ink. Is more preferable.
- the ink according to the present disclosure contains an organic solvent.
- the organic solvent used in the present disclosure is at least one selected from the group consisting of the compound represented by the following formula 1 and the compound represented by the formula 2.
- R 1 independently represents a hydrogen atom or a methyl group
- R 2 independently represents a linear or branched hydrocarbon group having 4 to 9 carbon atoms, or a carbon number of carbon atoms. It represents 6 to 10 aryl groups, where n represents an integer of 1 to 3.
- R 1 is preferably a hydrogen atom from the viewpoint of reducing the surface tension of the ink.
- n is preferably 1 or 2 from the viewpoint of reducing the surface tension of the ink.
- Formula 1 and Formula 2 as a straight-chain or branched hydrocarbon group of 4 to 9 carbon atoms represented by R 2, for example, n- butyl group, t- butyl group, n- pentyl group, Examples thereof include an n-hexyl group and a 2-ethylhexyl group.
- the aryl group having 6 to 10 carbon atoms represented by R 2 for example, a phenyl group, p- tolyl group, m- toluyl group, 2,6-dimethylphenyl group, 4-t Examples thereof include a butylphenyl group, a 4-methoxyphenyl group, a 4-butoxyphenyl group, a 2-chlorophenyl group and a naphthyl group.
- R 2 is preferably a linear or branched hydrocarbon group having 4 to 9 carbon atoms, and is directly formed by 6 to 8 carbon atoms. It is more preferably a chain or branched hydrocarbon group, and even more preferably an n-hexyl group or a 2-ethylhexyl group.
- the ClogP value of the organic solvent used in the present disclosure is 1.0 to 3.5, and is preferably 1.5 to 3.0 from the viewpoint of further improving the graininess of the obtained image. It is more preferably 8 to 2.9.
- the ClogP value of the organic solvent is 1.0 or more, it can be said that the hydrophobicity is high.
- the surface tension of the ink is low because the ClogP value of the organic solvent is 1.0 or more. Therefore, when the ink droplets land on the recording medium, they easily spread and the impact interference is suppressed. When the ink of the present disclosure is used, landing interference is suppressed, so that an image having excellent graininess can be obtained. Further, when the ClogP value of the organic solvent is 3.5 or less, the hydrophobicity is not too high and the discharge property is excellent.
- the ClogP value of the organic solvent is calculated using the fragment method.
- Examples of the calculation software using the fragment method include ChemDraw Professional 16.
- the content of the organic solvent is preferably 2.5% by mass or more with respect to the total mass of the ink from the viewpoint of reducing the surface tension of the ink.
- the upper limit of the content of the organic solvent is not particularly limited, but is preferably 30% by mass from the viewpoint of ink drying property.
- Examples of the organic solvent represented by the formula 1 or the formula 2 and having a ClogP value of 1.0 to 3.5 include ethylene glycol monopentyl ether, ethylene glycol monohexyl ether, ethylene glycol monoheptyl ether, and ethylene glycol monooctyl.
- Ethylene glycol monoalkyl ethers such as ethers, ethylene glycol monononyl ethers, ethylene glycol mono-2-ethylhexyl ethers; Diethylene glycol monoalkyl ethers such as diethylene glycol monopentyl ether, diethylene glycol monohexyl ether, diethylene glycol monoheptyl ether, diethylene glycol monooctyl ether, diethylene glycol monononyl ether, diethylene glycol mono-2-ethylhexyl ether; Triethylene glycol mono such as triethylene glycol monopentyl ether, triethylene glycol monohexyl ether, triethylene glycol monoheptyl ether, triethylene glycol monooctyl ether, triethylene glycol monononyl ether, triethylene glycol mono-2-ethylhexyl ether, etc.
- Propylene glycol monoalkyl ethers such as propylene glycol monobutyl ether, propylene glycol monopentyl ether, propylene glycol monohexyl ether, propylene glycol monoheptyl ether, propylene glycol monooctyl ether, propylene glycol mono-2-ethylhexyl ether; Dipropylene glycol monobutyl ether, dipropylene glycol monopentyl ether, dipropylene glycol monohexyl ether, dipropylene glycol monoheptyl ether, dipropylene glycol monooctyl ether, dipropylene glycol mono-2-ethylhexyl ether and the like.
- Tripropylene glycol monobutyl ether such as tripropylene glycol monobutyl ether, tripropylene glycol monopentyl ether, tripropylene glycol monohexyl ether, tripropylene glycol monoheptyl ether, tripropylene glycol monooctyl ether, tripropylene glycol mono-2-ethylhexyl ether, etc.
- Ethers and alkanediols such as 1,2-heptanediol, 1,2-octanediol, 1,2-nonanediol, 1,2-decanediol and the like.
- the organic solvent used in the present disclosure is preferably ethylene glycol monoalkyl ether, diethylene glycol monoalkyl ether or alkanediol, and is preferably ethylene glycol monohexyl ether, diethylene glycol monohexyl ether (hexyl diglycol), or diethylene glycol mono-2. -Ethylhexyl ether or 1,2-octanediol is more preferable.
- the ink according to the present disclosure contains resin particles.
- the resin particles used in the present disclosure include a resin containing a structural unit represented by the following formula 3 (hereinafter referred to as structural unit c1) in an amount of 1% by mass to 20% by mass with respect to the total mass of the resin.
- the resin particles may contain a resin and may contain a core agent or the like other than the resin, but the resin particles are preferably made of only the resin.
- R 3 represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms
- X 1 represents a divalent linking group
- Y 1 represents an anionic group, and among X 1 and Y 1.
- the atom farthest from the main chain is 4 to 27 atoms away from the main chain.
- the hydrophobicity of the structural unit c1 becomes high, and the hydrophobicity of the resin particles as a whole becomes high.
- the resin particles as a whole are highly hydrophobic, the resin particles are less likely to swell, and the ink according to the present disclosure is considered to be excellent in ejection property.
- the distance between the atoms farthest from the main chain is 27 atoms or less from the main chain, it is considered that the resin particles as a whole are not too hydrophobic and have excellent ejection properties.
- the distance of the atom farthest from the main chain among X1 and Y1 is preferably 27 atoms or less from the main chain.
- R 3 is preferably a hydrogen atom or a methyl group.
- R 4 represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, and is preferably a hydrogen atom or a methyl group, and more preferably a hydrogen atom.
- the main chain of 10 atoms to 23 atoms It is preferably separated, and more preferably 12 to 20 atoms away from the main chain.
- the structural unit c1 is preferably a structural unit represented by the following formula 4 or 5, and more preferably a structural unit represented by the formula 4.
- R 3 independently represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms
- L 1 independently represents a divalent linking group having 6 to 22 carbon atoms
- Y 1 represents an anionic group, and among L 1 and Y 1 , the atom farthest from the main chain is 4 to 27 atoms away from the main chain.
- R 3 has the same meaning as R 3 in the formula 3, preferred embodiment is also the same.
- a 1 is preferably a single bond.
- R 4 is preferably a hydrogen atom or a methyl group, and more preferably a hydrogen atom.
- L 1 preferably represents an alkylene group having 6 to 22 carbon atoms.
- the alkylene group may be linear or branched, but is preferably linear from the viewpoint of ink ejection property.
- L 1 is preferably an alkylene group having 8 to 22 carbon atoms, more preferably an alkylene group having 8 to 16 carbon atoms, and even more preferably an alkylene group having 10 to 12 carbon atoms.
- L 1 is preferably a divalent linking group having 6 to 20 carbon atoms.
- R 4 represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, and is preferably a hydrogen atom or a methyl group, and more preferably a hydrogen atom.
- n represents an integer of 5 to 18, with 7 to 15 being more preferable, and 10 to 12 being even more preferable.
- M represents a hydrogen atom, an alkali metal or a quaternary ammonium. M may be bound or dissociated. M is preferably an alkali metal from the viewpoint of dispersion stability of the resin particles in the ink. Examples of the alkali metal include sodium and potassium.
- the main chain of 10 atoms It is preferably separated by about 23 atoms, and more preferably 12 to 20 atoms away from the main chain.
- n represents the number of repetitions
- R represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms.
- the content of the structural unit c1 is 1% by mass to 20% by mass with respect to the total mass of the resin, and is preferably 1.5% by mass to 18% by mass, preferably 2% by mass, from the viewpoint of ink ejection property. More preferably, it is% to 12% by mass.
- the resin may contain only one type of structural unit c1 or may contain two or more types of resin.
- the above content means the total content of two or more types of structural unit c1.
- the structural unit c1 is a structural unit derived from a monomer containing an anionic group, and has a relatively long side chain, so that it is highly hydrophobic.
- the hydrophobicity of the structural unit derived from the anionic group-containing monomer is high, the hydrophobicity of the resin particles as a whole becomes high.
- the resin particles contained in the ink droplets are quickly fixed, and the impact interference is suppressed. Therefore, it is considered that an image having excellent graininess can be obtained by using the ink of the present disclosure.
- the resin particles as a whole are highly hydrophobic, the resin particles are less likely to swell, and the ink according to the present disclosure is considered to be excellent in ejection property.
- the content of the structural unit c1 is 1% by mass to 20% by mass with respect to the total mass of the resin, but the type of the structural unit other than the structural unit c1 is not particularly limited. Generally, it is considered that the physical properties of the entire resin change depending on the type of each structural unit constituting the resin. However, the present inventor obtains an image in which the ink ejection property is improved and the graininess is excellent as described above because the structural unit derived from the monomer containing an anionic group is the structural unit c1. I found that it was possible.
- the resin further contains a structural unit c2 derived from an ethylenically unsaturated compound having an aromatic ring structure or an alicyclic structure (hereinafter, also simply referred to as “structural unit c2”) as a structural unit other than the structural unit c1. Is preferable.
- Examples of the ring contained in the structural unit c2 include a benzene ring, a naphthalene ring, an anthracene ring, and an aliphatic hydrocarbon ring having 5 to 20 carbon atoms.
- the ring contained in the structural unit c2 is preferably a benzene ring and an aliphatic hydrocarbon ring having 6 to 10 carbon atoms. These rings may have substituents on the rings.
- the ethylenically unsaturated compound having an aromatic ring structure or an alicyclic structure is preferably an ethylenically unsaturated compound having an ethylenically unsaturated group at the end of the compound, and is preferably styrene, styrene having a substituent, or (meth) acrylate. It is more preferably a compound or a (meth) acrylamide compound, and even more preferably a styrene, a styrene having a substituent, or a (meth) acrylate compound.
- the structural unit c2 is preferably at least one selected from the group consisting of the structural units represented by the following formulas A to F from the viewpoint of improving the scratch resistance of the obtained image. Further, the structural unit c2 more preferably includes a structural unit represented by the following formula A from the viewpoint of further improving the ink ejection property.
- R 11 and R 12 each independently represent a hydrogen atom or a methyl group.
- Each of R 13 independently represents a linear or branched-chain alkyl group having 1 to 10 carbon atoms.
- n is an integer of 0 to 5 independently of each other.
- R 11 is preferably a hydrogen atom.
- R 12 is preferably a methyl group.
- R 13 is preferably a linear or branched alkyl group having 1 to 4 carbon atoms, and more preferably a methyl group or an ethyl group.
- n is preferably an integer of 0 to 2, more preferably 0 or 1, and even more preferably 0.
- L 2 is preferably a divalent linking group containing at least -O- or -NH- at the bonding site with the carbon atom bonded to the carbonyl group described in formula B, and is preferably the above-mentioned carbonyl group.
- the bonding site with the bonded carbon atom contains at least -O- or -NH- and contains a linear or branched alkylene group having 1 to 18 carbon atoms and which may have a ring structure.
- a divalent linking group is more preferred, -OCH 2- or -NHCH 2- is even more preferred, -OCH 2 -is particularly preferred in formulas C-E, L 2 is described in formulas C-F.
- a divalent linking group containing at least -O- or -NH- at the bonding site with the carbon atom bonded to the carbonyl group is preferable, -O- or -NH- is more preferable, and -O- is further preferable.
- the content of the structural unit c2 is preferably 5% by mass to 90% by mass, and more preferably 10% by mass to 50% by mass, based on the total mass of the resin, from the viewpoint of improving the ejectability of the ink. preferable.
- the resin may contain only one type of structural unit c2, or may contain two or more types.
- the above content means the total content of two or more types of structural unit c2.
- the resin may contain other structural unit c3 (hereinafter, also simply referred to as “structural unit c3”) other than the structural unit c1 and the structural unit c2.
- the structural unit c3 is not particularly limited, but is preferably a structural unit derived from a (meth) acrylamide compound or a (meth) acrylate compound, and more preferably a structural unit derived from a (meth) acrylate compound. Further, the structural unit c3 preferably does not contain an anionic group.
- the structural unit c3 is preferably a structural unit derived from an alkyl (meth) acrylate compound having an alkyl group having 1 to 10 carbon atoms.
- the alkyl group may be linear or branched, and may have a cyclic structure.
- the resin may or may not contain the structural unit c3.
- the content of the structural unit c3 is preferably 10% by mass to 90% by mass, preferably 30% by mass, based on the total mass of the resin from the viewpoint of improving the ink ejection property. It is more preferably% to 85% by mass, and further preferably 50% by mass to 80% by mass.
- the resin may contain only one type of structural unit c3, or may contain two or more types.
- the above content means the total content of two or more types of structural unit c3.
- the content of the anionic group with respect to the total mass of the resin in the resin contained in the resin particles is preferably 0.05 mmol / g to 0.7 mmol / g, preferably 0.1 mmol / g. More preferably, it is g to 0.4 mmol / g.
- the weight average molecular weight (Mw) of the resin is preferably 10,000 to 1,000,000, and more preferably 20,000 to 500,000.
- the weight average molecular weight means a value measured by gel permeation chromatography (GPC) unless otherwise specified.
- GPC gel permeation chromatography
- HLC registered trademark
- -8020 GPC manufactured by Tosoh Corporation
- TSKgel registered trademark
- Super Multipore HZ-H 4.6 mm ID ⁇ 15 cm
- THF tetrahydrofuran
- the measurement is performed using an RI detector with a sample concentration of 0.45% by mass, a flow rate of 0.35 ml / min, a sample injection amount of 10 ⁇ l, and a measurement temperature of 40 ° C.
- the calibration curve is "Standard sample TSK standard, polystyrene” manufactured by Tosoh Co., Ltd .: “F-40", “F-20”, “F-4", “F-1”, "A-5000", "A-” It is made from 8 samples of "2500", "A-1000", and "n-propylbenzene".
- the glass transition temperature (Tg) of the resin is preferably 30 ° C. to 120 ° C., more preferably 50 ° C. to 100 ° C., still more preferably 70 ° C. to 100 ° C. from the viewpoint of improving the scratch resistance of the image.
- the measured Tg obtained by actual measurement is applied.
- the measurement Tg is measured under normal measurement conditions using a differential scanning calorimeter, for example, a differential scanning calorimeter (product name "EXSTAR6220") manufactured by SII Nanotechnology.
- EXSTAR6220 differential scanning calorimeter
- Tgi the value of the homopolymer glass transition temperature of each monomer
- the volume average particle size of the resin particles is preferably 1 nm to 200 nm, more preferably 5 nm to 100 nm, and most preferably 10 nm to 50 nm from the viewpoint of ink ejection property.
- the volume average particle size is measured by a particle size distribution measuring device using light scattering, for example, a particle size distribution measuring device manufactured by Nikkiso Co., Ltd. (product name "Microtrack UPA (registered trademark) EX150").
- the method for producing the resin particles is not particularly limited, but it is preferably prepared by an emulsion polymerization method.
- the emulsion polymerization method is a method of polymerizing an emulsion prepared by adding a monomer, a polymerization initiator, an emulsifier, and if necessary, an additive such as a chain transfer agent to an aqueous medium (for example, water).
- an aqueous medium for example, water.
- the polymerization initiator used in the method for producing resin particles is not particularly limited, and is, for example, an inorganic persulfate (for example, potassium persulfate, sodium persulfate, ammonium persulfate, etc.), an azo-based initiator (for example, 2,2'-. Azobis (2-amidinopropane) dihydrochloride, 2,2'-azobis [2-methyl-N- (2-hydroxyethyl) -propionamide], etc.), organic peroxides (eg, peroxypivalic acid-t) -Butyl, t-butyl hydroperoxide, etc.), and salts thereof. Only one type of polymerization initiator may be used, or two or more types may be used in combination. Above all, the polymerization initiator is preferably an azo-based initiator or an organic peroxide.
- an inorganic persulfate for example, potassium persulfate, sodium persulfate, ammonium persul
- the amount of the polymerization initiator used is preferably 0.01% by mass to 2% by mass, more preferably 0.2% by mass to 1% by mass, based on the total mass of the monomer.
- the chain transfer agent used in the method for producing resin particles.
- the chain transfer agent is preferably a dimer of styrenes or mercaptans described in JP-A-5-17510.
- the resin particles are preferably dispersed in the ink. Further, the resin particles are preferably self-dispersing resin particles. When the self-dispersible resin particles are in a dispersed state by a phase inversion emulsification method in the absence of a surfactant, they can be in a dispersed state in an aqueous medium due to the functional groups (for example, anionic groups) of the resin itself. Resin particles made of water-insoluble resin.
- the dispersed state is both an emulsified state (emulsion) in which a water-insoluble resin is dispersed in a liquid state in an aqueous medium and a dispersed state (suspension) in which a water-insoluble resin is dispersed in a solid state in an aqueous medium. Is included.
- water insoluble means that the amount dissolved in 100 parts by mass of water at 25 ° C. is 5.0 parts by mass or less.
- the resin particles used in the present disclosure do not function as a dispersant for pigments. Further, the resin particles used in the present disclosure exist in the form of particles in the ink. Therefore, it is distinguished from the dispersants used in the present disclosure.
- the content of the resin particles is preferably 0.5% by mass to 20% by mass, preferably 1% by mass or more, based on the total mass of the ink, from the viewpoint of storage stability of the ink and scratch resistance of the obtained image. It is more preferably 10% by mass, and even more preferably 1.5% by mass to 8% by mass.
- n represents the number of repetitions, and the description of% by mass means the content of each structural unit.
- the resin particles used in the present disclosure are preferably resin particles made of the resins shown in the following specific examples. Further, in all of the following specific examples, the anionic group is described in the state of an acid, but a part or all of the acid may be a salt.
- the ink according to the present disclosure contains at least one dispersant.
- the dispersant has a function of dispersing the pigment.
- the dispersant is adsorbed on the surface of the pigment and covers at least a part of the surface of the pigment so that the pigment can be dispersed in water.
- the dispersant is preferably a polymer from the viewpoint of ink dispersion stability.
- the structure of the dispersant is not particularly limited and may be any of a random polymer, a block polymer, and a graft polymer. Further, the dispersant may be a polymer having a crosslinked structure. Above all, from the viewpoint of improving the ejection property of the ink, the dispersant preferably has a crosslinked structure, and more preferably a polymer having a crosslinked structure (hereinafter, also referred to as “crosslinked polymer”).
- the dispersant is adsorbed on the surface of the pigment, and a part of the dispersant is desorbed from the surface of the pigment and exists in the ink.
- the dispersant has a crosslinked structure, it is considered that the dispersant is hard to be detached from the surface of the pigment, so that the ink ejection property is improved.
- Whether or not the dispersant is crosslinked can be determined by, for example, the following method.
- the precipitated pigment dispersion is extracted with a highly polar organic solvent, and the components are analyzed by spectroscopic method or nuclear magnetic resonance (NMR) method to obtain a dispersant.
- the structure of the above and the content ratio of the constituent monomers are specified.
- the highly polar organic solvent used here is appropriately selected according to the type of polymer intended for extraction.
- the crosslinked polymer is formed, for example, by crosslinking an uncrosslinked polymer with a crosslinking agent.
- the uncrosslinked polymer is preferably a water-soluble polymer.
- the "water-soluble” in the “water-soluble polymer” means the property of being dissolved in distilled water at 25 ° C. in an amount of 2% by mass or more.
- the water-soluble resin is preferably dissolved in distilled water at 25 ° C. in an amount of 5% by mass or more, and more preferably 10% by mass or more.
- uncrosslinked polymer examples include polyvinyl, polyurethane and polyester. Above all, the uncrosslinked polymer is preferably polyvinyl.
- the uncrosslinked polymer is preferably a polymer having a functional group that can be crosslinked by a crosslinking agent.
- the crosslinkable functional group include a carboxy group or a salt thereof, an isocyanate group, and an epoxy group.
- the crosslinkable functional group is preferably a carboxy group or a salt thereof, and a carboxy group is particularly preferable.
- the polymer having a carboxy group is preferably a copolymer containing a structural unit derived from a monomer containing a carboxy group (hereinafter, referred to as "carboxy group-containing monomer").
- the structural unit derived from the carboxy group-containing monomer contained in the copolymer may be only one kind or two or more kinds.
- the copolymer may be a random copolymer or a block copolymer.
- carboxy group-containing monomer examples include (meth) acrylic acid, ⁇ -carboxyethyl acrylate, fumaric acid, itaconic acid, maleic acid and crotonic acid.
- the carboxy group-containing monomer is preferably (meth) acrylic acid or ⁇ -carboxyethyl acrylate, and more preferably (meth) acrylic acid, from the viewpoint of crosslinkability and dispersibility.
- the copolymer preferably contains a structural unit derived from a hydrophobic monomer in addition to a structural unit derived from a carboxy group-containing monomer.
- the structural unit derived from the hydrophobic monomer contained in the copolymer may be only one kind or two or more kinds.
- hydrophobic monomer examples include (meth) acrylate having an alkyl group having 1 to 20 carbon atoms and (meth) acrylate having an aromatic ring.
- the polymer having a carboxy group has a structural unit derived from a carboxy group-containing monomer, a structural unit derived from a (meth) acrylate having an alkyl group having 1 to 20 carbon atoms, and a structure derived from a (meth) acrylate having an aromatic ring. It is preferably a copolymer containing at least one selected from the group consisting of units, and a structural unit derived from (meth) acrylic acid and a structural unit derived from (meth) acrylate having an aromatic ring. , And a structural unit derived from (meth) acrylic acid and a structural unit derived from benzyl (meth) acrylate are particularly preferable.
- the acid value of the uncrosslinked polymer is preferably 67 mgKOH / g to 200 mgKOH / g, more preferably 67 mgKOH / g to 150 mgKOH / g, from the viewpoint of pigment dispersibility.
- the acid value of the crosslinked polymer is preferably 55 mgKOH / g to 100 mgKOH / g from the viewpoint of pigment dispersibility.
- the weight average molecular weight (Mw) of the uncrosslinked polymer is not particularly limited, but is preferably 3,000 to 100,000, preferably 5,000 to 80,000 from the viewpoint of pigment dispersibility. More preferably, 10,000 to 60,000 is even more preferable.
- the preferable range of the weight average molecular weight of the crosslinked polymer is the same as the preferable range of the weight average molecular weight of the uncrosslinked polymer.
- the cross-linking agent used when cross-linking the uncross-linked polymer is preferably a compound having two or more reaction sites with the uncross-linked polymer (for example, a polymer having a carboxy group). Only one type of cross-linking agent may be used, or two or more types may be used.
- a preferable combination of the cross-linking agent and the uncross-linked polymer is a combination of a compound having two or more epoxy groups (that is, a bifunctional or higher functional epoxy compound) and a polymer having a carboxy group.
- a crosslinked structure is formed by the reaction of the epoxy group and the carboxy group. This forms a crosslinked polymer.
- the formation of the crosslinked structure by the crosslinking agent is preferably carried out after the pigment is dispersed by the uncrosslinked polymer.
- Examples of the bifunctional or higher functional epoxy compound include ethylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, 1,6-hexanediol diglycidyl ether, diethylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, and dipropylene glycol diglycidyl.
- Examples include ethers, polypropylene glycol diglycidyl ethers and trimethylolpropan triglycidyl ethers.
- polyethylene glycol diglycidyl ether polyethylene glycol diglycidyl ether, diethylene glycol diglycidyl ether, or trimethylolpropane triglycidyl ether is preferable.
- the cross-linking agent may be a commercially available product.
- commercially available products include Denacol EX-321, EX-821, EX-830, EX-850 and EX-851 (manufactured by Nagase ChemteX Corporation).
- the molar ratio of the reaction site (eg, epoxy group) in the cross-linking agent to the reaction site (eg, carboxy group) in the uncrosslinked polymer is 1: 1 from the viewpoint of the cross-linking reaction rate and the dispersion stability after cross-linking. .1 to 1:10 is preferable, 1: 1.1 to 1: 5 is more preferable, and 1: 1.1 to 1: 3 is even more preferable.
- the mixing ratio of the pigment and the dispersant is preferably 1: 0.06 to 1: 3, more preferably 1: 0.125 to 1: 2, and 1: 0.125 to 1: 1.5 on a mass basis. Is even more preferable.
- the ink according to the present disclosure contains at least one type of silicone-based surfactant.
- the silicone-based surfactant is preferably a compound having a polysiloxane structure in the molecule.
- the ejection property of the ink is improved. It is considered that this is because when the silicone-based surfactant is contained, the ink is unlikely to adhere to the nozzle from which the ink is ejected.
- silicone-based surfactant examples include compounds in which an organic group is introduced into a part of dimethylpolysiloxane.
- Organic groups are introduced into the side chain, one end, both ends, or both side chains and ends of dimethylpolysiloxane.
- the dimethylpolysiloxane introduced with an organic group examples include modified silicone compounds such as amine-modified silicone, alcohol-modified silicone, polyether-modified silicone, and long-chain alkyl-modified silicone.
- the silicone-based surfactant is preferably a polyether-modified silicone.
- the silicone-based surfactant is preferably a compound having a molecular weight of 200 to 2000 and having a structure represented by the following formula 4.
- R 4 represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, and x, y and z each independently represent an integer of 1 or more. * Represents the binding position with other structures in the molecule.
- R 4 is preferably a hydrogen atom or a methyl group.
- the molecular weight of the silicone-based surfactant is 200 to 2000, preferably 400 to 1800. Silicone-based surfactants having a molecular weight of 200 to 2000 tend to be oriented at the interface, so that the ejection property is improved.
- the content of the silicone-based surfactant is preferably 0.03% by mass to 0.8% by mass, more preferably 0.04% by mass to 0.5% by mass, based on the total mass of the ink. It is preferably 0.05% by mass to 0.3% by mass, and more preferably 0.05% by mass to 0.3% by mass.
- the inks according to the present disclosure include ultraviolet absorbers, anti-fading agents, fungicides, pH adjusters, rust inhibitors, antioxidants, emulsion stabilizers, preservatives, defoamers, viscosity regulators, dispersion stabilizers, etc.
- Known additives such as a chelating agent and a solid wetting agent may be further contained.
- the preservative refers to an agent having a function of preventing the growth and growth of microorganisms, particularly bacteria and fungi (molds).
- the preservative may be either an inorganic preservative or an organic preservative.
- the inorganic preservative include compounds containing heavy metal ions, silver ions and the like.
- organic preservatives include quaternary ammonium salts (eg, tetrabutylammonium chloride, cetylpyridinium chloride, benzyltrimethylammonium chloride, etc.), phenol derivatives (eg, phenol, cresol, butylphenol, xylenol, bisphenol, etc.), phenoxy.
- Ether derivatives eg, phenoxyethanol, etc.
- heterocyclic compounds eg, benzotriazole, proxel, PROXEL, 1,2-benzoisothiazolin-3-one, etc.
- alkanediols eg, pentylene glycol (1,2-).
- Pentandiol isopentyldiol (eg, 3-methyl-1,3-butanediol), hexanediol (eg, 1,2-hexanediol, etc.), caprylyl glycol (eg, 1,2-octanediol), etc.
- Acid amides carbamates, carbamates, amidin guanidines, pyridines (eg, sodium pyridinethion-1-oxide, etc.), diazins, triazines, pyrrole imidazoles, oxazole oxazines, thiazole.
- the preservative is preferably at least one selected from the group consisting of heterocyclic compounds, phenol derivatives, phenoxy ether derivatives, and alkanediols.
- examples of preservatives include those described in the Antibacterial and Microfungal Handbook (Gihodo: 1986), the Antibacterial and Antifungal Agent Dictionary (edited by the Japanese Society of Antibacterial and Antifungal Encyclopedia Editorial Committee), and the like.
- the preservative is preferably a water-soluble compound.
- the ink according to the present disclosure may contain only one type of preservative, or may contain two or more types of preservatives.
- the two or more kinds of preservatives When combining two or more kinds of preservatives, it is preferable that the two or more kinds of preservatives have skeletons having different chemical structures from each other.
- at least one kind of preservative is preferably a heterocyclic compound, a phenol derivative, a phenoxyether derivative, or an alkanediol, and is a heterocyclic compound. Is more preferable.
- a combination of the heterocyclic compound and the phenoxy ether derivative, a combination of the heterocyclic compound and the phenol derivative, and a combination of the heterocyclic compound and the alkanediols are preferable.
- the heterocyclic compound is preferably a thiazole-based compound or a benzotriazole-based compound.
- the thiazole-based compound functions as a fungicide, among other preservatives.
- Examples of thiazole compounds include methylisothiazolinone, benzisothiazolinone, isothiazolinone, 1,2-benzisothiazolin-3-one, 5-chloro-2-methyl-4-isothiazolin-3-one, 2- (thiocyanomethylthio).
- Benzthiazole, 2-mercaptobenzithiazole and 3-allyloxy-1,2-benzisothiazolin-1,1-oxide can be mentioned.
- Proxel TM series (BDN, BD20, GXL, LV, XL2), KORDEKMLX, Roshima 553, Roshima 552, Permakem SK-50H, Topside 240, Topside, manufactured by Arch Chemicals, Inc. 1000 and Ultra 10 can also be used.
- Benzotriazole compounds function as rust preventives, among other preservatives. For example, it is possible to suppress the generation of rust due to contact between a metal material constituting an inkjet head (particularly, a 42 alloy (a nickel-iron alloy containing 42% by mass of nickel)) and an ink.
- a metal material constituting an inkjet head particularly, a 42 alloy (a nickel-iron alloy containing 42% by mass of nickel)
- examples of the benzotriazole-based compound include 1H-benzotriazole, 4-methyl-1H-benzotriazole, 5-methyl-1H-benzotriazole, and sodium or potassium salts thereof.
- the content ratio when two or more kinds of preservatives are combined is not particularly limited, but the content of each preservative is preferably 1% by mass or more of the total content of the preservatives, and is preferably 10% by mass or more. More preferably, it is more preferably 20% by mass or more.
- the content of each preservative is preferably 99% by mass or less, more preferably 90% by mass or less, and further preferably 80% by mass or less of the total content of the preservative.
- the content of the preservative (when two or more kinds of preservatives are contained, the total content thereof) is preferably 0.001% by mass to 10% by mass, and 0.005% by mass, based on the total mass of the ink. It is more preferably mass% to 2.0% by mass, and further preferably 0.01 to 0.5% by mass. Within the above range, the effect of the preservative can be obtained more efficiently, and the generation of precipitates can be suppressed.
- the ink according to the present disclosure preferably has a dynamic surface tension of 35 mN / m or less at 10 milliseconds.
- the lower limit of the dynamic surface tension at 10 milliseconds is not particularly limited, but is preferably 15 mN / m from the viewpoint of ink storage stability.
- the dynamic surface tension at 10 milliseconds is measured by the maximum foam pressure method in an environment of a temperature of 23 ° C. and a relative humidity of 55%.
- the dynamic surface tension at 10 milliseconds is measured using, for example, a bubble pressure type dynamic surface tension meter (product name “BP100”, manufactured by KRUSS).
- the dynamic surface tension at 10 ms is the maximum bubble pressure from the time when bubbles are continuously ejected from the probe capillary tube inserted in the ink and a new interface is formed in the tip of the probe capillary tube (0 ms). It refers to the surface tension calculated from the maximum foam pressure when the time until it becomes 10 milliseconds.
- the dynamic surface tension of the ink ejected from the nozzle begins to decrease from the moment it is ejected, decreases even after landing on the recording medium, and finally converges to the value of the static surface tension of the ink.
- the rate of decrease in dynamic surface tension is greatest immediately after ejection, and gradually decreases as time elapses after ejection. Therefore, when a certain ink drop A lands on the recording medium and then the next ink drop B lands on the recording medium, the dynamic surface tension of the ink drop A becomes the ink drop B at the time when the ink drop B lands. It is lower than the dynamic surface tension of.
- the ink droplet A having a relatively low dynamic surface tension is attracted to the ink droplet B having a relatively high dynamic surface tension, resulting in uneven image density.
- the layer density becomes uneven the image becomes rough. That is, the graininess of the image is inferior.
- the dynamic surface tension at 10 milliseconds is the value closest to the dynamic surface tension at the moment when the ink droplets land on the recording medium.
- the dynamic surface tension at 10 milliseconds is 35 mN / m or less, ink droplets spread on the recording medium and landing interference can be suppressed. Unevenness in image density is unlikely to occur, and an image with better graininess can be obtained.
- the viscosity of the ink according to the present disclosure is preferably 1.2 mPa ⁇ s to 15.0 mPa ⁇ s, more preferably 2.0 mPa ⁇ s to 13.0 mPa ⁇ s or less, and 2.5 mPa ⁇ s. It is more preferably ⁇ 10.0 mPa ⁇ s or less.
- the viscosity of the ink is measured at a temperature of 30 ° C. using a rotary viscometer, for example, the product name "VISCOMETER TV-22" manufactured by Toki Sangyo Co., Ltd.
- the pH of the ink according to the present disclosure is preferably 6.0 to 11.0, more preferably 7.0 to 10.0, and 7.0 to 9 from the viewpoint of storage stability of the ink. It is more preferably 0.0.
- the pH of the ink is measured at a temperature of 25 ° C. using a pH meter, for example, the product name "WM-50EG" manufactured by Toa DDK.
- the image recording method according to the present disclosure includes a step of applying the ink according to the present disclosure on a recording medium using an inkjet recording method to record an image (hereinafter, also referred to as an “ink application step”).
- the image recording method includes, if necessary, a step of drying water and an organic solvent contained in the ink applied on the recording medium (hereinafter, also referred to as “ink drying step”), and ink. It may have other steps such as a step of melting and fixing the resin particles (hereinafter, also referred to as “heat fixing step”).
- the image recording method according to the present disclosure is preferably a method in which the ink according to the present disclosure is directly applied onto a recording medium to record an image. That is, the image recording method according to the present disclosure is preferably a so-called one-component system.
- the ink applying step is a step of applying the ink according to the present disclosure onto a recording medium using an inkjet recording method to record an image.
- the recording medium is not particularly limited, and examples thereof include coated paper used for general offset printing and the like.
- the coated paper is obtained by applying a coating material to the surface of high-quality paper, acid-free paper, etc., which is mainly composed of cellulose and is not generally surface-treated, to provide a coating layer.
- Coated paper is available as a commercial product.
- Coated papers include, for example, Oji Paper's "OK Top Coat +", Nippon Paper Industries' “Aurora Coat”, “Eurite” and other coated papers (A2, B2), and Mitsubishi Paper Mills' “OK Top Coat +”.
- Art papers (A1) such as "Tokuryo Art” can be mentioned.
- a known method can be used, for example, a charge control method for ejecting ink by using an electrostatic attraction force, and a drop-on-demand method (pressure pulse method) using the vibration pressure of a piezo element.
- An acoustic inkjet method that converts an electric signal into an acoustic beam and irradiates the ink to eject the ink using radiation pressure, and a thermal inkjet method that heats the ink to form bubbles and utilizes the generated pressure. ..
- the image recording method using an inkjet recording device includes a shuttle scan method (also referred to as a "serial head method") in which an image is recorded using a short serial head, and a recording element corresponding to the entire width direction of the recording medium.
- a single-pass method also referred to as a "line head method” in which an image is recorded using a line head in which is arranged.
- the shuttle scan method an image is recorded while scanning the serial head in the width direction of the recording medium.
- the single-pass method the image can be recorded on the entire surface of the recording medium by scanning the recording medium in the direction orthogonal to the arrangement direction of the recording elements.
- the single-pass method does not require a transport system such as a carriage that scans the serial head. Further, in the single-pass method, complicated scanning control between the movement of the carriage and the recording medium becomes unnecessary, and only the recording medium moves, so that the recording speed can be increased as compared with the shuttle scan method.
- the amount of ink ejected from the inkjet head is preferably 1 pL (picolitre) to 10 pL, and more preferably 1.5 pL to 6 pL, from the viewpoint of ensuring image quality.
- the amount of droplets dropped means the volume of ink ejected from one nozzle at one time by the inkjet recording method.
- the inkjet head When the inkjet head has a nozzle surface on which a nozzle for ejecting ink is arranged, the inkjet head may have a moisturizing cap that covers the nozzle surface and forms a moisturizing space with the nozzle surface.
- a moisturizing liquid can be stored in the moisturizing cap to increase the humidity of the moisturizing space.
- the moisturizer preferably contains at least an acetylene glycol-based surfactant, water, and a preservative.
- the moisturizer may further contain other components such as a basic compound and an antifoaming agent, if necessary.
- the moisturizer is not a liquid for recording an image, and the content of a colorant such as a pigment is preferably less than 0.1% by mass, and more preferably no colorant is contained.
- the moisturizer preferably contains at least one of the acetylene glycol-based surfactants represented by the following formula 6.
- the acetylene glycol-based surfactant represented by the formula 6 is contained, the ejection property of the ink immediately after the ink is supplied to the inkjet head is improved.
- R 52 , R 53 , R 54 , and R 55 each independently represent a hydrogen atom or a linear, branched, or cyclic alkyl group having 1 to 8 carbon atoms.
- Y 2 and Y 3 each independently represent an alkylene group having 2 to 6 carbon atoms.
- x and y represent the average number of moles added and satisfy 1 ⁇ x + y ⁇ 85.
- Examples of the linear, branched, or cyclic alkyl group having 1 to 8 carbon atoms represented by R 52 and R 54 include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, and an n-butyl group. Examples thereof include a group, an isobutyl group, a 2-butyl group, a t-butyl group, a hexyl group, a cyclohexyl group and an octyl group.
- R 52 and R 54 represent a cyclic alkyl group
- the alkyl group preferably has 3 to 8 carbon atoms.
- R 52 and R 54 are preferably alkyl groups having 1 to 3 carbon atoms, and most preferably methyl groups.
- Examples of the linear, branched, or cyclic alkyl group having 1 to 8 carbon atoms represented by R 53 and R 55 include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, and an n-butyl group. Examples thereof include a group, an isobutyl group, a 2-butyl group, a t-butyl group, a hexyl group, a cyclohexyl group and an octyl group.
- R 53 and R 55 represent a cyclic alkyl group, the alkyl group preferably has 3 to 8 carbon atoms.
- R 53 and R 55 are preferably linear, branched, or cyclic alkyl groups having 3 to 8 carbon atoms, and isobutyl groups are particularly preferable.
- the sum of x and y is 1 to 85 (1 ⁇ x + y ⁇ 85), preferably 3 to 50, more preferably 3 to 30, and even more preferably 5 to 30.
- the sum of x and y is 3 or more, the solubility is further improved and the cloud point is higher. As a result, separation, precipitation, etc. when the moisturizer is heated to 30 ° C. or higher are further suppressed.
- the sum of x and y is 30 or less, the effect of lowering the surface tension and improving the wettability appears more effectively. As a result, when the filled ink is ejected after the moisturizer is filled, the ejection property of the ejected ink is further improved.
- Y 2 and Y 3 are each independently preferably an alkylene group having 2 to 4 carbon atoms, more preferably an alkylene group having 2 or 3 carbon atoms, and particularly preferably an alkylene group having 2 carbon atoms (ethylene group). That is, among the compounds represented by the formula 6, the acetylene glycol-based surfactant represented by the following formula 7 is more preferable.
- R 52, R 53, R 54, R 55, x, and y are R 52 in formula 6, R 53, R 54, R 55, x, and y respectively synonymous preferred ranges thereof Is the same.
- Examples of the acetylene glycol-based surfactant represented by the formula 6 include 2,4,7,9-tetramethyl-5-decyne-4,7-diol and 3,6-dimethyl-4-octyne-3,6-. Glycols, alkylene oxide adducts such as 2,5,8,11-tetramethyl-6-dodecin-5,8-diols, 2,5-dimethyl-3-hexyne-2,5-diols (preferably ethylene oxide adducts) ).
- the acetylene glycol-based surfactant represented by the formula 6 is an ethylene oxide adduct of 2,4,7,9-tetramethyl-5-decyne-4,7-diol (3 ⁇ x + y ⁇ 30, preferably 5). ⁇ x + y ⁇ 30) is preferable.
- the acetylene glycol-based surfactant represented by the formula 6 may be used alone or mixed with various additives.
- the acetylene glycol-based surfactant represented by the formula 6 may be a commercially available product on the market.
- Commercially available products include the Surfinol series (eg, Surfinol 420, Surfinol 440, Surfinol 465 and Surfinol 485) manufactured by Air Products & Chemicals or Nissin Chemicals, and the Orfin series (eg Orfin E1010 and Orfin). E1020), the Dynol series (for example, Dynol 604), and acetylenol manufactured by Kawaken Fine Chemicals Co., Ltd. can be mentioned. Further, commercially available products are also provided by Dow Chemical Co., Ltd., General Aniline Co., Ltd. and the like.
- the content of the acetylene glycol-based surfactant in the moisturizing liquid is preferably 0.01% by mass to 5% by mass, more preferably 0.1% by mass to 2% by mass, based on the total mass of the moisturizing liquid. It is preferably%.
- the content of the acetylene glycol-based surfactant is within the above range, the ejection property of the ink immediately after the ink is supplied to the inkjet head is improved, and the generation of bubbles in the ink is suppressed.
- the moisturizer contains two or more kinds of acetylene glycol-based surfactants, it is preferable that the total amount satisfies the above range.
- the surface tension of the moisturizer can be reduced.
- the moisturizer with low surface tension enhances the wettability of the inner wall surface of the inkjet head, thereby improving the ink ejection property.
- An acetylene glycol-based surfactant having a higher cloud point is preferable from the viewpoint of further suppressing precipitation caused by heating the moisturizer to 30 ° C. to 90 ° C.
- the acetylene glycol-based surfactant is an ethylene oxide adduct of 2,4,7,9-tetramethyl-5-decyne-4,7-diol (3 ⁇ x + y ⁇ 30, more preferably 5 ⁇ ).
- x + y ⁇ 30 is the most preferable.
- the moisturizer preferably contains water. That is, the moisturizer is an aqueous liquid.
- the content of water in the moisturizer is not particularly limited, but is preferably 60% by mass or more, more preferably 70% by mass or more, and particularly preferably 80% by mass or more, based on the total mass of the moisturizer.
- the upper limit of the water content is not particularly limited, and is, for example, 99.8% by mass, preferably 99.5% by mass.
- the moisturizer may contain other components such as a basic compound, an organic solvent, and a preservative in addition to the acetylene glycol-based surfactant and water.
- the moisturizer may contain at least one of the basic compounds.
- the basic compound is preferably a compound having a pKa value of 6.0 to 8.5 in that it exhibits a pH buffering ability in the pH range of the moisturizer.
- the basic compound may be either an inorganic compound or an organic compound.
- the basic compound is preferably a basic organic compound because it is easy to obtain a desired pKa value and the solubility is good.
- the pKa value of the basic organic compound is the pKa value of the conjugate acid.
- Examples of the basic compound include cacodylic acid (pKa: 6.2), 2,2-bis (hydroxymethyl) -2,2', 2 "-nitrilotriethanol (pKa: 6.5), piperazine-N, N'-bis- (2-ethanesulfuric acid) (pKa: 6.8), phosphoric acid (pKa2: 6.86), imidazole (pKa: 7.0), N'-2-hydroxyethylpiperazine-N', 2-ethanesulfate (pKa: 7.6), N-methylmorpholine (pKa: 7.8), triethanolamine (pKa: 7.8), hydrazine (pKa: 8.11) and trishydroxymethylaminomethane (pKa: 8.11) pKa: 8.3) can be mentioned.
- cacodylic acid pKa: 6.2
- 2,2-bis (hydroxymethyl) -2,2', 2 "-nitrilotriethanol pKa: 6.5
- the content of the basic compound in the moisturizing liquid is preferably 0.0001% by mass to 0.1% by mass, preferably 0.001% by mass, based on the total mass of the moisturizing liquid. ⁇ 0. 01% by mass is more preferable.
- the pH of the moisturizer at 25 ° C. is not particularly limited, but 6.5 to 10 is set from the viewpoint of preventing aggregation with the ink component when mixed with the ink and enhancing the liquid contact resistance of the members inside the inkjet head. Preferably, 7-9 is more preferable.
- the pH of the moisturizing solution can be adjusted by adding an acid such as nitric acid, sulfuric acid, hydrochloric acid, phosphoric acid, or succinic acid after adding the basic compound.
- the acid used for adjustment is preferably nitric acid from the viewpoint of metal corrosion resistance.
- the moisturizer may contain at least one kind of preservative.
- the preservative contained in the moisturizer include the same preservatives contained in the ink.
- the preservative contained in the moisturizer is preferably a thiazole-based compound or a benzotriazole-based compound.
- thiazole compounds include methylisothiazolinone, benzisothiazolinone, isothiazolinone, 1,2-benzisothiazolin-3-one, 5-chloro-2-methyl-4-isothiazolin-3-one, 2- (thiocyanomethylthio).
- Benzthiazole, 2-mercaptobenzithiazole and 3-allyloxy-1,2-benzisothiazolin-1,1-oxide can be mentioned.
- Proxel TM series (BDN, BD20, GXL, LV, XL2), KORDEKMLX, Roshima 553, Roshima 552, Permakem SK-50H, Topside 240, Topside, manufactured by Arch Chemicals, Inc. 1000 and Ultra 10 can also be used.
- the content of the preservative (when two or more kinds of preservatives are contained, the total content thereof) is preferably 0.001% by mass to 10% by mass, based on the total mass of the moisturizing solution. It is more preferably 005% by mass to 2.0% by mass, and further preferably 0.01 to 0.5% by mass. Within the above range, the effect of the preservative can be obtained more efficiently, and the generation of precipitates can be suppressed.
- the image recording method may include an ink drying step, if necessary.
- the ink drying step is a step of drying the water and the organic solvent contained in the ink applied on the recording medium.
- the heating means is not particularly limited as long as the water and the organic solvent contained in the ink can be dried, and examples thereof include a heat drum, warm air, an infrared lamp, a heat oven, and a heat plate. The heating temperature and heating time are appropriately adjusted according to the contents of water and the organic solvent contained in the ink.
- the image recording method according to the present disclosure may include a heat fixing step after the ink applying step, if necessary.
- the heat fixing step is a step of melting and fixing the resin particles contained in the ink.
- the heat fixing step fixes the image on the recording medium, and the scratch resistance of the image can be improved.
- the heat fixing step for example, the heat fixing step described in paragraphs 0112 to 0120 of JP2010-221415A can be adopted.
- Part is based on mass.
- the volume average particle size was measured using a particle size distribution measuring device (product name "Microtrack UPA (registered trademark) EX150”) manufactured by Nikkiso Co., Ltd.
- HLC (registered trademark) -8020 GPC (manufactured by Tosoh Corporation) was used as a measuring device, and TSKgel (registered trademark) Super Multipore HZ-H (4.6 mm ID ⁇ 15 cm, manufactured by Tosoh Corporation) was used as a column.
- THF tetrahydrofuran
- the measurement was carried out using an RI detector with a sample concentration of 0.45% by mass, a flow rate of 0.35 mL / min, a sample injection amount of 10 ⁇ L, and a measurement temperature of 40 ° C.
- the calibration curve is "Standard sample TSK standard, polystyrene” manufactured by Tosoh Co., Ltd .: "F-40", “F-20”, “F-4”, “F-1”, “A-5000”, “A-” It was prepared from 8 samples of "2500”, “A-1000", and "n-propylbenzene".
- the glass transition temperature was measured using a differential scanning calorimeter (product name "EXSTAR6220") manufactured by SII Nanotechnology.
- the dynamic surface tension at 10 milliseconds was measured using a bubble pressure type dynamic surface tension meter (product name "BP100", manufactured by KRUSS).
- a mixed solution consisting of 08 g) and water (9 g) was added, and the mixture was stirred for 10 minutes.
- a monomer solution composed of styrene (30 g) and methyl methacrylate (63 g) was added dropwise to the three-necked flask at a constant velocity so that the addition was completed in 3 hours.
- a mixed solution consisting of V-501 (0.06 g), potassium hydrogen carbonate (0.04 g) and water (6 g) was added to the mixed solution immediately after the start of dropping the monomer solution and 1.5 hours after the start of dropping the monomer solution. Added in batches. After the dropping of the above monomer solution was completed, the mixture was stirred for 1 hour.
- a mixed solution consisting of V-501 (0.06 g), potassium hydrogen carbonate (0.04 g) and water (6 g) was added to the obtained reaction mixture, and the mixture was further stirred for 3 hours.
- the obtained reaction mixture was filtered through a mesh having a mesh of 50 ⁇ m to obtain an aqueous dispersion of resin particles C-1.
- the obtained aqueous dispersion of the resin particles C-1 had a pH of 8.5, a solid content concentration of 25% by mass, a volume average particle size of 30 nm, a weight average molecular weight (Mw) of 250,000, and a Tg of 96 ° C.
- resin particles C-2, C-6, C-10, C-11, C-21 to C-30 and resin particles D to F were prepared by the same method as the resin particles C-1, except that the type and amount of the monomers used were changed to the types and amounts described below.
- -6, C-10, C-11, C-21 to C-30 and resin particles D to F were prepared.
- the resin particles D are resin particles that do not contain a structural unit having an anionic group represented by the formula 3.
- a monomer feed composition was prepared by mixing methacrylic acid (172 parts), benzyl methacrylate (828 parts), and isopropanol (375 parts).
- an initiator feed composition was prepared by mixing 2,2-azobis (2-methylbutyronitrile) (22.05 parts) and isopropanol (187.5 parts).
- isopropanol (187.5 parts) was heated to 80 ° C. under a nitrogen atmosphere, and a mixture of the monomer feed composition and the initiator feed composition was added dropwise thereto over 2 hours. After completion of the dropping, the obtained solution was kept at 80 ° C. for another 4 hours and then cooled to 25 ° C.
- a bead mill (bead diameter 0.1 mm ⁇ , zirconia beads) is prepared by mixing an uncrosslinked polymer Q2 aqueous solution (124 parts), a magenta pigment (48 parts), water (75 parts), and dipropylene glycol (30 parts). The mixture was subjected to dispersion treatment until the desired volume average particle size was obtained, to obtain a magenta pigment dispersion liquid P1 having a pigment concentration of 15% by mass.
- the magenta pigment dispersion liquid P1 is a pigment dispersion liquid in which magenta pigments are dispersed by the uncrosslinked polymer Q2.
- the uncrosslinked polymer Q2 is a dispersant having no crosslinked structure.
- Trimethylolpropane polyglycidyl ether product name "Denacol EX-321", manufactured by Nagase ChemteX Corporation
- an aqueous boric acid solution (boric acid)
- Acid concentration: 4% by mass) (14.3 parts) was added, and the mixture was reacted at 50 ° C. for 6 and a half hours and then cooled to 25 ° C. to obtain a mixture.
- the uncrosslinked polymer Q2 in the magenta pigment dispersion was crosslinked.
- the crosslinked body of the uncrosslinked polymer Q2 is hereinafter referred to as “crosslinked polymer Q3”.
- the mixture was purified so that the concentration of dipropylene glycol in the mixture was 0.1% by mass or less, and then concentrated to a pigment concentration of 15% by mass to obtain a pigment dispersion liquid P2.
- the pigment dispersion liquid P2 is a pigment dispersion liquid in which magenta pigments are dispersed by the crosslinked polymer Q3.
- the crosslinked polymer Q3 is a dispersant having a crosslinked structure.
- a pigment dispersion P1 in which the magenta pigment was dispersed by the uncrosslinked polymer Q2 and a pigment dispersion P2 in which the magenta pigment was dispersed by the crosslinked polymer Q3 were obtained.
- Example 1 Each component was mixed so as to have the following composition. Coarse particles were removed from the mixture using a 1 ⁇ m filter to prepare an ink.
- composition Magenta pigment dispersion P2: Amount at which the pigment concentration is 5% by mass
- Organic solvent Ethylene glycol monohexyl ether (ClogP value: 1.8896): 3% by mass
- Silicone surfactant 0.1% by mass
- Water Remaining (mass%) totaling 100% by mass
- Examples 2 to 28, Comparative Examples 1 to 8 The types of dispersants, the types and contents of organic solvents (% by mass), the types of resin particles, and the types and contents of silicone-based surfactants (% by mass) have been changed as shown in Tables 1 and 2.
- the ink was prepared in the same manner as in Example 1 except that the ink was prepared.
- (Dispersant) -Dispersant having a crosslinked structure The crosslinked polymer Q3 -Dispersant having no crosslinked structure: The above-mentioned uncrosslinked polymer Q2
- inks were prepared using the magenta pigment dispersion liquid P2. Further, in Example 28, an ink was prepared using the magenta pigment dispersion liquid P1. Tables 1 and 2 show whether or not the dispersant has a crosslinked structure.
- EGmHE Organic solvent-Ethethylene glycol monohexyl ether
- DEGmHE Diethylene glycol monohexyl ether
- R 1 is Hydrogen atom
- compound in which R 2 is n-hexyl group and n is 2, 1,2-octanediol: in formula 2, compound in which R 2 is n-hexyl group, diethylene glycol mono-2-ethylhexyl ether (DEGmEHE) :
- DEGmEHE diethylene glycol mono-2-ethylhexyl ether
- R 1 is a hydrogen atom
- R 2 is a 2-ethylhexyl group
- n is 2.
- 1,2-butanediol In formula 2 , a compound in which R 2 is an ethyl group.
- ⁇ Image recording> As a recording medium, coated paper (trade name "OK Top Coat +", manufactured by Oji Paper Co., Ltd.) was used, and the inks of Examples and Comparative Examples were ejected by a single-pass method under the following conditions, and an image was recorded.
- ⁇ Head: 1,200 dpi (dot per inch, 1 inch 2.54 cm) / 20 inch width piezo full line head
- the graininess and ejection properties were evaluated using the inks of Examples and Comparative Examples.
- the evaluation results are shown in Tables 1 and 2.
- the evaluation method is as follows.
- the graininess of the image was evaluated by recording one image having a recording duty of 80% and visually observing the image of the obtained image recording material.
- the evaluation criteria are as follows. A rating of 3 or higher is within the practically acceptable range. 5: There is no graininess. 4: A slight graininess is observed. 3: A slight graininess is observed. 2: A grainy feeling is observed. 1: A remarkable graininess is observed.
- the recording duty of 100% is defined as an image recorded under the condition that one drop of about 2.6 pL of ink is applied to a unit area (1 pixel) of 1/1200 inch ⁇ 1/1200 inch with a resolution of 1200 dpi ⁇ 1200 dpi. do. 5: No ejection failure nozzle 4: There are one or two ejection failure nozzles. 3: There are 3 to 5 ejection failure nozzles. 2: There are 6 to 10 ejection failure nozzles. 1: There are 11 or more ejection failure nozzles.
- the group consists of a pigment, a dispersant having a crosslinked structure, a compound represented by the following formula 1 and a compound represented by the formula 2.
- An organic solvent which is at least one selected and has a ClogP value of 1.0 to 3.5 and a structural unit represented by the formula 3 are added in an amount of 1% by mass to 20% by mass based on the total mass of the resin. It was found that the obtained image was excellent in graininess and ink ejection property because it contained resin particles containing% of the resin, a silicone-based surfactant, and water.
- Example 1 the dynamic surface tension of the ink after 10 milliseconds was 35 mN / m or less, and it was found that the graininess of the obtained image was excellent as compared with Example 25.
- Example 1 the content of the organic solvent represented by the formula 1 or the formula 2 and having a ClogP value of 1.0 to 3.5 is 2.5% by mass or more with respect to the total mass of the ink. It was found that the graininess of the obtained image was excellent as compared with Example 25.
- Example 1 the content of the silicone-based surfactant was 0.03% by mass or more with respect to the total mass of the ink, and it was found that the ink ejection property was excellent as compared with Example 26.
- Example 1 the content of the silicone-based surfactant was 0.8% by mass or less with respect to the total mass of the ink, and it was found that the graininess of the obtained image was excellent as compared with Example 27.
- Examples 1 and 6 to 18 are examples in which resin particles having various structural units are used. All of these resin particles are resin particles containing a resin containing the structural unit represented by the formula 3 in an amount of 1% by mass to 20% by mass with respect to the total mass of the resin. From Examples 1 and 6 to 18, it was found that the obtained images were excellent in graininess and ink ejection property.
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Abstract
Description
式1又は式2中、R1はそれぞれ独立に、水素原子又はメチル基を表し、R2はそれぞれ独立に、炭素数4~9の直鎖状若しくは分岐鎖状の炭化水素基、又は炭素数6~10のアリール基を表し、nは1~3の整数を表す。
式3中、R3は水素原子又は炭素数1~4のアルキル基を表し、X1は、2価の連結基を表し、Y1は、アニオン性基を表し、X1及びY1のうち、主鎖から最も離れた原子は、主鎖から4原子~27原子離れている。
<2>10ミリ秒時の動的表面張力が35mN/m以下である、<1>に記載のインクジェット記録用インク。
<3>有機溶剤の含有量は、インクの全質量に対して2.5質量%以上である、<1>又は<2>に記載のインクジェット記録用インク。
<4>シリコーン系界面活性剤の含有量は、インクの全質量に対して0.03質量%~0.8質量%である、<1>~<3>のいずれか1つに記載のインクジェット記録用インク。
<5>樹脂は、さらに、芳香環構造又は脂環式構造を有するエチレン性不飽和化合物由来の構造単位を、樹脂の全質量に対して5質量%~90質量%含有する、<1>~<5>のいずれか1つに記載のインクジェット記録用インク。
<6><1>~<5>のいずれか1つに記載のインクジェット記録用インクを、インクジェット記録方式を用いて記録媒体上に付与して画像を記録する工程を含む画像記録方法。
本開示において、組成物中の各成分の量は、組成物中に各成分に該当する物質が複数存在する場合、特に断らない限り、組成物中に存在する上記複数の物質の合計量を意味する。
本開示中に段階的に記載されている数値範囲において、ある数値範囲で記載された上限値又は下限値は、他の段階的な記載の数値範囲の上限値又は下限値に置き換えてもよく、また、実施例に示されている値に置き換えてもよい。
本開示において、「工程」との語は、独立した工程だけでなく、他の工程と明確に区別できない場合であっても工程の所期の目的が達成されれば、本用語に含まれる。
本開示において、好ましい態様の組み合わせは、より好ましい態様である。
本開示において、「(メタ)アクリル」は、アクリル及びメタクリルの両方を包含する概念であり、「(メタ)アクリレート」は、アクリレート及びメタクリレートの両方を包含する概念である。
本開示に係るインクジェット記録用インク(以下、単に「インク」ともいう。)は、顔料と、分散剤と、下記式1で表される化合物及び式2で表される化合物からなる群より選択される少なくとも1種であり、かつ、ClogP値が1.0~3.5である有機溶剤と、下記式3で表される構造単位を、樹脂の全質量に対して1質量%~20質量%含有する樹脂を含む樹脂粒子と、シリコーン系界面活性剤と、水と、を含む。
式1又は式2中、R1はそれぞれ独立に、水素原子又はメチル基を表し、R2はそれぞれ独立に、炭素数4~9の直鎖状若しくは分岐鎖状の炭化水素基、又は炭素数6~10のアリール基を表し、nは1~3の整数を表す。
本開示に係るインクは、顔料を含有する。顔料の種類は特に限定されず、有機顔料及び無機顔料のいずれであってもよい。顔料としては、例えば、伊藤征司郎編「顔料の事典」(2000年刊)、W.Herbst,K.Hunger「Industrial Organic Pigments」、特開2002-12607号公報、特開2002-188025号公報、特開2003-26978号公報及び特開2003-342503号公報に記載の顔料が挙げられる。
本開示に係るインクは、水を含有する。
本開示に係るインクは、有機溶剤を含有する。本開示で用いられる有機溶剤は、下記式1で表される化合物及び式2で表される化合物からなる群より選択される少なくとも1種である。
ジエチレングリコールモノペンチルエーテル、ジエチレングリコールモノヘキシルエーテル、ジエチレングリコールモノヘプチルエーテル、ジエチレングリコールモノオクチルエーテル、ジエチレングリコールモノノニルエーテル、ジエチレングリコールモノ-2-エチルヘキシルエーテル等のジエチレングリコールモノアルキルエーテル;
トリエチレングリコールモノペンチルエーテル、トリエチレングリコールモノヘキシルエーテル、トリエチレングリコールモノヘプチルエーテル、トリエチレングリコールモノオクチルエーテル、トリエチレングリコールモノノニルエーテル、トリエチレングリコールモノ-2-エチルヘキシルエーテル等のトリエチレングリコールモノアルキルエーテル;
プロピレングリコールモノブチルエーテル、プロピレングリコールモノペンチルエーテル、プロピレングリコールモノヘキシルエーテル、プロピレングリコールモノヘプチルエーテル、プロピレングリコールモノオクチルエーテル、プロピレングリコールモノ-2-エチルヘキシルエーテル等のプロピレングリコールモノアルキルエーテル;
ジプロピレングリコールモノブチルエーテル、ジプロピレングリコールモノペンチルエーテル、ジプロピレングリコールモノヘキシルエーテル、ジプロピレングリコールモノヘプチルエーテル、ジプロピレングリコールモノオクチルエーテル、ジプロピレングリコールモノ-2-エチルヘキシルエーテル等のジプロピレングリコールモノアルキルエーテル;
トリプロピレングリコールモノブチルエーテル、トリプロピレングリコールモノペンチルエーテル、トリプロピレングリコールモノヘキシルエーテル、トリプロピレングリコールモノヘプチルエーテル、トリプロピレングリコールモノオクチルエーテル、トリプロピレングリコールモノ-2-エチルヘキシルエーテル等のトリプロピレングリコールモノアルキルエーテル;及び
1,2-ヘプタンジオール、1,2-オクタンジオール、1,2-ノナンジオール、1,2-デカンジオール等のアルカンジオールが挙げられる。
本開示に係るインクは、樹脂粒子を含有する。
本開示で用いられる樹脂粒子は、下記式3で表される構造単位(以下、構造単位c1」という。)を、樹脂の全質量に対して1質量%~20質量%含有する樹脂を含む。
一方、主鎖から最も離れた原子の距離が主鎖から27原子以下であると、樹脂粒子全体として疎水性が高すぎず、吐出性に優れると考えられる。また、原料の入手しやすさ及び製造適性の観点からも、X1及びY1のうち、主鎖から最も離れた原子の距離は主鎖から27原子以下であることが好ましい。
樹脂は、構造単位c1以外の構造単位として、芳香環構造又は脂環式構造を有するエチレン性不飽和化合物由来の構造単位c2(以下、単に「構造単位c2」ともいう。)をさらに含有することが好ましい。
式B~式F中、R12はメチル基であることが好ましい。
式A~式C中、R13はそれぞれ独立に、直鎖状又は分岐鎖状の炭素数1~4のアルキル基であることが好ましく、メチル基又はエチル基であることがより好ましい。
式A~式C中、nは0~2の整数であることが好ましく、0又は1であることがより好ましく、0であることがさらに好ましい。
式B中、L2は、式B中に記載されたカルボニル基と結合した炭素原子との結合部位に、少なくとも-O-又は-NH-を含む2価の連結基が好ましく、上記カルボニル基と結合した炭素原子との結合部位に、少なくとも-O-又は-NH-を含み、かつ、炭素数1~18の、環構造を有してもよい直鎖状又は分岐鎖状のアルキレン基を含む2価の連結基がより好ましく、-OCH2-又は-NHCH2-がさらに好ましく、-OCH2-が特に好ましい
式C~式E中、L2は、式C~式F中に記載されたカルボニル基と結合した炭素原子との結合部位に、少なくとも-O-又は-NH-を含む2価の連結基が好ましく、-O-又は-NH-がより好ましく、-O-がさらに好ましい
樹脂は、構造単位c1及び構造単位c2以外の、その他の構造単位c3(以下、単に「構造単位c3」ともいう。)を含有していてもよい。
樹脂粒子の分散性の観点から、樹脂粒子に含まれる樹脂において、樹脂の全質量に対するアニオン性基の含有量は、0.05mmol/g~0.7mmol/gであることが好ましく0.1mmol/g~0.4mmol/gであることがより好ましい。
1/Tg=Σ(Xi/Tgi) …(1)
ここで、計算対象となるポリマーはi=1からnまでのn種のモノマー成分が共重合しているとする。Xiはi番目のモノマーの質量分率(ΣXi=1)、Tgiはi番目のモノマーの単独重合体のガラス転移温度(絶対温度)である。ただし、Σはi=1からnまでの和をとる。なお、各モノマーの単独重合体ガラス転移温度の値(Tgi)は、Polymer Handbook (3rd Edition) (J.Brandrup, E.H.Immergut著(Wiley-Interscience、1989))の値を採用する。
樹脂粒子の製造方法は、特に限定されないが、乳化重合法により調製されることが好ましい。乳化重合法は、水性媒体(例えば水)中にモノマー、重合開始剤、乳化剤、及び、必要に応じて連鎖移動剤等の添加剤を加えて調製した乳化物を重合させる方法である。乳化重合法を樹脂粒子の調製に適用する場合において、上記の構造単位c1を形成するモノマーは、乳化剤としても機能する。したがって、構造単位c1を形成するモノマー以外に乳化剤を別途添加する必要はないが、インクの吐出性及び画質を低下させない範囲であれば、既知の乳化剤を別途添加してもよい。
また、樹脂粒子は、自己分散性樹脂粒子であることが好ましい。自己分散性樹脂粒子とは、界面活性剤の不存在下、転相乳化法により分散状態とした場合、樹脂自身が有する官能基(例えば、アニオン性基)によって、水性媒体中で分散状態となり得る水不溶性樹脂からなる樹脂粒子をいう。
本開示に係るインクは、分散剤を少なくとも1種含む。本開示において、分散剤とは、顔料を分散させる機能を有する。顔料の表面に分散剤が吸着し、顔料の表面の少なくとも一部を被覆することにより、顔料が水中で分散することができる。
市販品としては、例えば、Denacol EX-321、EX-821、EX-830、EX-850及びEX-851(ナガセケムテックス社製)が挙げられる。
本開示に係るインクは、シリコーン系界面活性剤を少なくとも1種含む。シリコーン系界面活性剤は、分子中にポリシロキサン構造を有する化合物であることが好ましい。インク中にシリコーン系界面活性剤が含有されていると、インクの吐出性が向上する。これは、シリコーン系界面活性剤が含有されていると、インクが吐出されるノズルに、インクが付着しにくいためであると考えられる。
本開示に係るインクは、紫外線吸収剤、褪色防止剤、防黴剤、pH調整剤、防錆剤、酸化防止剤、乳化安定剤、防腐剤、消泡剤、粘度調整剤、分散安定剤、キレート剤、固体湿潤剤等の公知の添加剤をさらに含有してもよい。
本開示において、防腐剤とは、微生物、特に細菌・真菌(カビ)の発生、発育を防止する機能を有するものをいう。
〔動的表面張力〕
本開示に係るインクは、10ミリ秒時の動的表面張力が35mN/m以下であることが好ましい。10ミリ秒時の動的表面張力の下限値は特に限定されないが、インクの保存安定性の観点から、15mN/mであることが好ましい。
本開示に係るインクの粘度は、1.2mPa・s~15.0mPa・sであることが好ましく、2.0mPa・s~13.0mPa・s以下であることがより好ましく、2.5mPa・s~10.0mPa・s以下であることがさらに好ましい。
本開示に係るインクのpHは、インクの保存安定性の観点から、6.0~11.0であることが好ましく、7.0~10.0であることがより好ましく、7.0~9.0であることがさらに好ましい。
本開示に係る画像記録方法は、本開示に係るインクをインクジェット記録方式を用いて記録媒体上に付与して画像を記録する工程(以下、「インク付与工程」ともいう)を含む。
インク付与工程は、本開示に係るインクをインクジェット記録方式を用いて記録媒体上に付与して画像を記録する工程である。
本開示に係る画像記録方法では、必要に応じて、インク乾燥工程を含んでもよい。インク乾燥工程は、記録媒体上に付与されたインク中に含まれる水及び有機溶剤を乾燥させる工程である。加熱手段は、インク中に含まれる水及び有機溶剤を乾燥させることができれば特に限定されず、例えば、ヒートドラム、温風、赤外線ランプ、熱オーブン及びヒート版が挙げられる。加熱温度及び加熱時間は、インクに含まれる水及び有機溶剤の含有量に応じて適宜調整される。
本開示に係る画像記録方法では、必要に応じて、インク付与工程後、熱定着工程を含んでもよい。熱定着工程は、インクに含まれる樹脂粒子を溶融し、定着させる工程である。熱定着工程により、記録媒体上の画像の定着が行われ、画像の耐擦過性を向上させることができる。熱定着工程として、例えば、特開2010-221415号公報の段落0112~0120に記載の熱定着工程を採用することができる。
<樹脂粒子C-1の調製>
撹拌機、温度計、還流冷却管、及び窒素ガス導入管を備えた三口フラスコに、水(250g)、12-メタクリルアミドドデカン酸(7.0g)、炭酸水素カリウム(0.17g)及びイソプロパノール(20g)を仕込んで、窒素気流下で85℃まで昇温した。ここに4,4’-アゾビス(4-シアノ吉草酸)(ラジカル重合開始剤、製品名「V-501」、富士フイルム和光純薬工業社製)(0.11g)、炭酸水素カリウム(0.08g)及び水(9g)からなる混合溶液を加え、10分間撹拌した。次いで、上記三口フラスコに、スチレン(30g)とメタクリル酸メチル(63g)からなるモノマー溶液を3時間で滴下が完了するように等速で滴下した。さらに、V-501(0.06g)、炭酸水素カリウム(0.04g)及び水(6g)からなる混合溶液を、上記モノマー溶液の滴下開始直後とモノマー溶液の滴下開始1.5時間後の2回に分けて加えた。上記モノマー溶液の滴下完了後、1時間撹拌した。続いて、得られた反応混合物にV-501(0.06g)、炭酸水素カリウム(0.04g)及び水(6g)からなる混合溶液を加え、さらに3時間撹拌した。得られた反応混合物を網目50μmのメッシュでろ過し、樹脂粒子C-1の水性分散液を得た。得られた樹脂粒子C-1の水性分散液はpH8.5、固形分濃度25質量%、体積平均粒径30nm、重量平均分子量(Mw)25万、Tg96℃であった。
樹脂粒子C-1の調製において、使用するモノマーの種類及び量を、以下に記載の種類及び量に変更したこと以外は、樹脂粒子C-1と同様の方法により、樹脂粒子C-2、C-6、C-10、C-11、C-21~C-30及び樹脂粒子D~Fを調製した。樹脂粒子Dは、式3で表されるアニオン性基を有する構造単位を含まない樹脂粒子である。
-分散剤の合成-
メタクリル酸(172部)と、ベンジルメタクリレート(828部)と、イソプロパノール(375部)とを混合することにより、モノマー供給組成物を調製した。また、2,2-アゾビス(2-メチルブチロニトリル)(22.05部)と、イソプロパノール(187.5部)とを混合することにより、開始剤供給組成物を調製した。次に、イソプロパノール(187.5部)を窒素雰囲気下、80℃に加温し、そこに、モノマー供給組成物及び開始剤供給組成物の混合物を2時間かけて滴下した。滴下終了後、得られた溶液をさらに4時間、80℃に保った後、25℃まで冷却した。冷却後、溶媒を減圧除去することにより、重量平均分子量(Mw)約30,000、酸価112mgKOH/gの未架橋ポリマーQ1(メタクリル酸/ベンジルメタクリレート共重合体)を得た。
得られた未架橋ポリマーQ1(150部)中のメタクリル酸量の0.8当量を、水酸化カリウム水溶液を用いて中和し、未架橋ポリマーQ2(メタクリル酸/ベンジルメタクリレート共重合体のカリウム塩)を得た。未架橋ポリマーQ2の濃度が25質量%となるようにイオン交換水を加え、未架橋ポリマーQ2水溶液を得た。
下記組成となるように各成分を混合した。1μmフィルターを用いて、混合液から粗大粒子を除去し、インクを調製した。
マゼンタ顔料分散液P2:顔料濃度が5質量%となる量
有機溶剤:エチレングリコールモノヘキシルエーテル(ClogP値:1.8986): 3質量%
樹脂粒子C-1の水分散液:樹脂粒子C-1の濃度が6質量%となる量
シリコーン系界面活性剤:0.1質量%
水:合計が100質量%となる残部(質量%)
分散剤の種類、有機溶剤の種類及び含有量(質量%)、樹脂粒子の種類、並びに、シリコーン系界面活性剤の種類及び含有量(質量%)を、表1及び表2に示すように変更した以外は、実施例1と同様の方法でインクを調製した。
・マゼンタ顔料(ピグメントレッド122)
・架橋構造を有する分散剤・・・上記架橋ポリマーQ3
・架橋構造を有しない分散剤・・・上記未架橋ポリマーQ2
なお、実施例1~実施例27、比較例1~比較例8では、上記マゼンタ顔料分散液P2を用いてインクを調製した。また、実施例28では、上記マゼンタ顔料分散液P1を用いてインクを調製した。表1及び表2では、分散剤が架橋構造を有するか否かを記載した。
・エチレングリコールモノヘキシルエーテル(EGmHE):式1中、R1が水素原子、R2がn-ヘキシル基、nが1である化合物
・ジエチレングリコールモノヘキシルエーテル(DEGmHE):式1中、R1が水素原子、R2がn-ヘキシル基、nが2である化合物
・1,2-オクタンジオール:式2中、R2がn-ヘキシル基である化合物
・ジエチレングリコールモノ-2-エチルヘキシルエーテル(DEGmEHE):式1中、R1が水素原子、R2が2-エチルヘキシル基、nが2である化合物
・1,2-ブタンジオール:式2中、R2がエチル基である化合物
・ジエチレングリコールジブチルエーテル(DEGDBE):式1又は式2で表される化合物に該当しない化合物
上記のとおり調製した樹脂粒子C-2、C-6、C-10、C-11、C-21~C-30及び樹脂粒子D~Fを用いた。
-シリコーン系界面活性剤-
・BYK-347:ポリエーテル変性シリコーン(BYK社製)
・BYK-348:ポリエーテル変性シリコーン(BYK社製)
・BYK-349:ポリエーテル変性シリコーン(BYK社製)
・BYK-3450:ポリエーテル変性シリコーン(BYK社製)
・BYK-3451:ポリエーテル変性シリコーン(BYK社製)
・BYK-375:ポリエーテルエステル変性水酸基含有ポリジメチルシロキサン(BYK社製)
・BYK-024:破泡性ポリシロキサン、疎水性粒子、及びポリグリコールの混合物(BYK社製)
-フッ素系界面活性剤-
・Capstone FS-3100:DuPont社製
記録媒体として、コート紙(商品名「OKトップコート+」、王子製紙社製)を用い、実施例及び比較例のインクを、シングルパス方式により下記条件で吐出し、画像を記録した。
・ヘッド:1,200dpi(dot per inch、1inch = 2.54cm)/20inch幅ピエゾフルラインヘッド
・吐出量:2.6pL
・駆動周波数:30kHz(基材搬送速度635mm/sec)
記録デューティ80%の画像を1枚記録し、得られた画像記録物の画像を目視で観察することにより、画像の粒状性を評価した。評価基準は以下のとおりである。評価3以上は、実用上の許容範囲内である。
5:粒状感がない。
4:僅かに粒状感が認められる。
3:若干の粒状感が認められる。
2:粒状感が認められる。
1:顕著な粒状感が認められる。
記録デューティ100%のベタ画像を1枚記録した後、インクジェット記録装置を停止させた。25℃、相対湿度50%の条件下で10分間、インクジェットヘッドを大気に暴露させた。10分後、インクジェット記録装置のノズルチェックパターンを1枚記録した。記録したノズルチェックパターンを目視で観察し、不吐ノズル数(単位:本)に基づいてインクの吐出性を評価した。評価基準は以下のとおりである。評価3以上は、実用上の許容範囲内である。
なお、記録デューティ100%とは、解像度1200dpi×1200dpiで1/1200インチ×1/1200インチの単位領域(1画素)に約2.6pLのインクを1滴付与する条件で記録された画像と定義する。
5:不吐ノズルがない
4:不吐ノズルが1~2本である。
3:不吐ノズルが3~5本である。
2:不吐ノズルが6~10本である。
1:不吐ノズルが11本以上である。
Claims (6)
- 顔料と、
分散剤と、
下記式1で表される化合物及び式2で表される化合物からなる群より選択される少なくとも1種であり、かつ、ClogP値が1.0~3.5である有機溶剤と、
下記式3で表される構造単位を、樹脂の全質量に対して1質量%~20質量%含有する樹脂を含む樹脂粒子と、
シリコーン系界面活性剤と、
水と、を含むインクジェット記録用インク。
式1又は式2中、R1はそれぞれ独立に、水素原子又はメチル基を表し、R2はそれぞれ独立に、炭素数4~9の直鎖状若しくは分岐鎖状の炭化水素基、又は炭素数6~10のアリール基を表し、nは1~3の整数を表す。
式3中、R3は水素原子又は炭素数1~4のアルキル基を表し、X1は、2価の連結基を表し、Y1は、アニオン性基を表し、X1及びY1のうち、主鎖から最も離れた原子は、主鎖から4原子~27原子離れている。 - 10ミリ秒時の動的表面張力が35mN/m以下である、請求項1に記載のインクジェット記録用インク。
- 前記有機溶剤の含有量は、インクの全質量に対して2.5質量%以上である、請求項1又は請求項2に記載のインクジェット記録用インク。
- 前記シリコーン系界面活性剤の含有量は、インクの全質量に対して0.03質量%~0.8質量%である、請求項1~請求項3のいずれか1項に記載のインクジェット記録用インク。
- 前記樹脂は、さらに、芳香環構造又は脂環式構造を有するエチレン性不飽和化合物由来の構造単位を、樹脂の全質量に対して5質量%~90質量%含有する、請求項1~請求項4のいずれか1項に記載のインクジェット記録用インク。
- 請求項1~請求項5のいずれか1項に記載のインクジェット記録用インクを、インクジェット記録方式を用いて記録媒体上に付与して画像を記録する工程を含む画像記録方法。
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US20230057093A1 (en) | 2023-02-23 |
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