WO2023163063A1 - Composition d'encre, jeu d'encres, produit enregistré présentant une composition d'encre appliquée sur un matériau de base, procédé d'enregistrement, procédé de fabrication d'un produit enregistré et dispositif d'enregistrement à jet d'encre équipé d'un récipient de stockage rempli de la composition d'encre - Google Patents

Composition d'encre, jeu d'encres, produit enregistré présentant une composition d'encre appliquée sur un matériau de base, procédé d'enregistrement, procédé de fabrication d'un produit enregistré et dispositif d'enregistrement à jet d'encre équipé d'un récipient de stockage rempli de la composition d'encre Download PDF

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Publication number
WO2023163063A1
WO2023163063A1 PCT/JP2023/006538 JP2023006538W WO2023163063A1 WO 2023163063 A1 WO2023163063 A1 WO 2023163063A1 JP 2023006538 W JP2023006538 W JP 2023006538W WO 2023163063 A1 WO2023163063 A1 WO 2023163063A1
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Prior art keywords
ink composition
ink
composition according
resin
resins
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PCT/JP2023/006538
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English (en)
Japanese (ja)
Inventor
保真 齋藤
祐二 牧本
充功 田村
Original Assignee
株式会社Ｄｎｐファインケミカル
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Publication of WO2023163063A1 publication Critical patent/WO2023163063A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D11/00—Inks
    • C09D11/30—Inkjet printing inks

Definitions

  • the present invention provides an ink composition, an ink set, a recorded matter obtained by applying the ink composition onto a substrate, a recording method, a method for producing a recorded matter, and an ink jet recording method equipped with a container filled with the ink composition. Regarding the device.
  • the inkjet recording method is a recording method in which droplets of an ink composition are directly ejected from very fine nozzles onto a base material such as paper and applied to obtain letters and images.
  • This recording method is easy to reduce size, increase speed, reduce noise, save power, and colorize. , and the range of application has expanded to include commercial printing applications.
  • Aqueous ink compositions in which various coloring materials are dissolved or dispersed in water or a mixture of water and a water-soluble organic solvent are widely used as ink compositions used in inkjet recording systems.
  • Such water-based ink compositions have less impact on the environment than non-aqueous ink compositions containing organic solvents used in the same inkjet recording system, and are non-flammable. Safe for people.
  • the aqueous ink composition requires a larger amount of heat for drying, so in terms of productivity, it was necessary to set the drying temperature higher than extending the drying time. As a result, the power consumption of the device increases, so the need for a 200V power supply limits the installation location and makes it difficult to comply with safety standards. giving.
  • Patent Document 1 describes a technique relating to an inkjet recording method including a step of ejecting an aqueous ink composition containing 2-pyrrolidone and water-insoluble thermoplastic resin particles containing a urethane resin.
  • Japanese Patent Laid-Open No. 2002-100001 describes that this inkjet recording method can obtain an image with little ink bleeding, high image quality, and excellent abrasion resistance.
  • An object of the present invention is to provide an ink composition with high drying properties and high productivity of the resulting recorded matter.
  • the present inventors found that the above problems can be solved with an ink composition containing an amide-based solvent having a predetermined boiling point or less. Arrived. Specifically, the present invention provides the following.
  • the amide solvent includes N-ethyl-N-methylformamide, N-methyl-N-propylformamide, N,N-diethylformamide, N-ethyl-N-propylformamide, N,N-dimethylacetamide, selected from the group consisting of N-ethyl-N-methylacetamide, N-methyl-N-propylacetamide, N,N-diethylacetamide, N,N-dimethylpropanamide, and N-ethyl-N-methylpropanamide
  • the ink composition according to (1) or (2).
  • the content of the leveling agent is in the range of 0.1 parts by mass or more and 50 parts by mass or less with respect to 100 parts by mass of the amide solvent contained in the ink composition ( The ink composition according to any one of 1) to (9).
  • the dispersible resin includes acrylic resin, polyurethane resin, polyester resin, vinyl chloride resin, vinyl acetate resin, polyether resin, vinyl chloride vinyl acetate copolymer resin, polyethylene resin, and acrylamide resin.
  • the ink composition according to any one of (11) to (13), containing one or more resins or copolymer resins selected from the group consisting of resins, epoxy resins, polycarbonate resins, silicone resins, and polystyrene resins. thing.
  • the ink composition according to any one of (11) to (15) is applied onto a substrate by an ink jet method, and then the substrate is coated at a temperature lower than the Tg of the resin contained in the ink composition.
  • (21) A method for producing recorded matter, comprising applying the ink composition according to any one of (1) to (16) or the ink composition contained in the ink set according to (17) onto a substrate by an inkjet method. .
  • the ink composition of the present invention has high drying properties, and the productivity of the resulting recorded matter is high.
  • the ink composition according to the present embodiment is an ink composition for inkjet and contains a water-soluble organic solvent.
  • the water-soluble organic solvent is characterized by containing an amide-based solvent having a boiling point of 230°C or less.
  • An ink composition containing such an amide-based solvent having a boiling point of 230° C. or less has high drying properties and high productivity of the resulting recorded matter.
  • an amide-based solvent with a boiling point of 230° C. or less acts as a film-forming aid when the ink composition contains a resin.
  • a temperature equal to or higher than a predetermined temperature (minimum film-forming temperature) during film formation of the ink composition, the resin contained in the ink composition can be fused to form a scratch-resistant coating film.
  • a predetermined temperature minimum film-forming temperature
  • This minimum film-forming temperature is generally near the Tg of the resin, but it is possible to lower the minimum film-forming temperature by using an amide-based solvent with a boiling point of 230° C. or less contained in the ink composition. Even at a low drying temperature such as a temperature below the Tg of , the resin can be fused on the substrate, and a coating film having sufficient scratch resistance can be formed.
  • the ink composition according to the present embodiment may be a colored ink containing a coloring material.
  • coloring material includes dyes and pigments, such as yellow, magenta, cyan, black, and dyes contained in colored inks that form images such as intermediate colors and light colors thereof, or The concept includes pigments, white dyes or white pigments contained in white ink, and bright pigments contained in metallic ink.
  • the colored inks may be yellow, magenta, cyan, black, and colored inks that form images such as intermediate colors and light colors thereof. Further, the colored ink may be white ink containing a white colorant, metallic ink containing a bright pigment, or the like.
  • the ink composition according to the present embodiment may be a receiving solution containing a cationic compound that is applied to the substrate prior to applying the colored ink to the substrate.
  • it may be a clear ink containing no coloring material, or an overcoat ink for forming an overcoat layer on the surface of a printed matter.
  • the ink composition according to this embodiment contains a water-soluble organic solvent.
  • the water-soluble organic solvent is 5 parts by mass or more, preferably 20 parts by mass or more, more preferably 50 parts by mass or more, and still more preferably 70 parts by mass in 100 parts by mass of water at 25°C under 1 atmosphere. Parts or more, more preferably 90 parts by mass or more can be dissolved.
  • this water-soluble organic solvent contains an amide-based solvent with a boiling point of 230°C or less.
  • the amide-based solvent having a boiling point of 230° C. or less will be described below.
  • An amide-based solvent having a boiling point of 230° C. or lower is an organic solvent having a boiling point of 230° C. or lower and having a —C( ⁇ O)—N— group (amide bond).
  • Examples of amide-based solvents having a boiling point of 230° C. or lower include alkoxyalkylamide-based solvents having an alkoxyalkyl group (C n H 2n+1 —O—C m H 2m —) and alkyl groups having an alkyl group (C n H 2n+1 —).
  • Examples include amide-based solvents and cyclic amide-based solvents having a cyclic structure and a —C( ⁇ O)—N— group in the cyclic structure.
  • the amide-based solvent having a boiling point of 230°C or lower is preferably an alkylamide-based solvent, an alkoxyalkylamide-based solvent, or a cyclic amide-based solvent, and more preferably an alkylamide-based solvent.
  • an alkylamide-based solvent, an alkoxyalkylamide-based solvent, or a cyclic amide-based solvent By containing an alkylamide-based solvent, an alkoxyalkylamide-based solvent, or a cyclic amide-based solvent, the ink composition exhibits the effects of the present invention.
  • amide-based solvents with a high water/1-octanol partition coefficient are preferred.
  • the partition coefficient is an index of the hydrophobicity of an organic solvent, and a higher organic solvent with a higher partition coefficient (LogP) in water/1-octanol means that the organic solvent has relatively higher hydrophobicity. is.
  • An ink composition containing an amide-based solvent having a boiling point of 230°C or less has high drying properties and high productivity of the resulting recorded matter.
  • the drying property is high and the solvent penetration into the substrate is high, so bleeding is especially prevented on absorbent substrates and vinyl chloride resin substrates. is suppressed, making it possible to produce clear recorded matter.
  • the organic solvent contained in the ink composition remains in the coating film formed by the ink composition.
  • Containing an amide-based solvent with a high water/1-octanol partition coefficient (LogP) that is, an amide-based solvent with relatively high hydrophobicity
  • the ink composition can form a coating film having high water friction resistance.
  • the amide solvent having a boiling point of 230° C. or less preferably has a water/1-octanol partition coefficient (LogP) of ⁇ 0.6 or more, more preferably ⁇ 0.4 or more. It is preferably ⁇ 0.3 or more, and more preferably ⁇ 0.3 or more.
  • the amide-based solvent having a boiling point of 230° C. or less preferably has a water/1-octanol distribution coefficient (LogP) of 1.5 or less, more preferably 1.0 or less, and 0.5 or less. It is even more preferable to have By containing an amide-based solvent having a water/1-octanol partition coefficient (LogP) of 1.5 or less, the compatibility with other organic solvents is increased, and the storage stability of the ink composition is improved. Become.
  • the boiling point of the amide-based solvent having a boiling point of 230°C or lower is preferably 220°C or lower, more preferably 210°C or lower. As a result, an ink composition having higher drying properties can be obtained.
  • the boiling point of the amide-based solvent having a boiling point of 230° C. or lower is preferably 130° C. or higher, more preferably 140° C. or higher, and even more preferably 150° C. or higher. When the boiling point of the amide-based solvent is 130° C. or higher, it is possible to suppress deterioration in ejection stability due to increased drying properties on the nozzle surface.
  • alkylamide-based solvent an alkoxyalkylamide-based solvent, and a cyclic amide-based solvent will be described below as suitable examples of amide-based solvents having a boiling point of 230°C or lower.
  • alkylamide-based solvent for example, an alkylamide-based solvent having an alkylamide-based structure represented by formula (1) can be preferably used.
  • R 1 is hydrogen or an alkyl group having 1 to 4 carbon atoms, and R 2 and R 3 are functional groups which may be independent.
  • R 2 and R 3 are not particularly limited as long as they are functional groups.
  • R 2 and R 3 are preferably hydrogen, an alkyl group, an alkoxy group, a hydroxyalkyl group or a hydroxyl group. more preferably hydrogen or an alkyl group having 1 to 4 carbon atoms.
  • alkylamide-based solvents in which R 1 to R 3 in formula (1) are hydrogen or alkyl groups include formamide, acetamide, propanamide, butanamide, isobutylamide, pentanamide, and N-methylformamide.
  • R 2 and R 3 in formula (1) are alkoxy groups, hydroxyl groups, and hydroxyalkyl groups
  • R 2 and R 3 in formula (1) are alkoxy groups, hydroxyl groups, and hydroxyalkyl groups
  • examples of those in which R 2 and R 3 in formula (1) are alkoxy groups, hydroxyl groups, and hydroxyalkyl groups include N-ethyl-N-(2-methoxyethyl)formamide and N-methoxymethylformamide. , N-hydroxymethyl-N-methylacetamide, N-(2-hydroxyethyl)-N-methylacetamide, N-methoxymethyl-N-methylformamide, or those having a different carbon number or a branched carbon chain structure etc.
  • Alkylamide solvents selected from the group are particularly preferred.
  • alkoxyalkylamide-based solvent for example, among alkylamide-based solvents having an alkylamide-based structure represented by formula (2), those having a boiling point of 230° C. or lower can be preferably used.
  • R 12 is each independently an alkyl group having 1 to 4 carbon atoms
  • R 13 is an alkylene group having 1 to 4 carbon atoms
  • R 10 and R 11 are each independently It is a functional group that may be independent.
  • R 12 is preferably an alkyl group having 1 or more and 2 or less carbon atoms, more preferably an alkyl group having 1 or more and 2 or less carbon atoms.
  • R 13 is preferably an alkylene group having 1 to 3 carbon atoms, more preferably an alkylene group having 1 to 2 carbon atoms.
  • R 10 and R 11 are not particularly limited as long as they are functional groups.
  • R 10 and R 11 are preferably hydrogen, an alkyl group, an alkoxy group, a hydroxyalkyl group, or a hydroxyl group. is more preferred, hydrogen or an alkyl group having 1 to 4 carbon atoms is more preferred, and hydrogen or an alkyl group having 1 to 2 carbon atoms is even more preferred.
  • alkoxyalkylamide-based solvent 3-methoxy-N,N-dimethylpropanamide, 3-propoxy-N,N-dimethylpropanamide, or the difference in the number of carbon atoms in the alkoxy group or alkyl group or the branched structure of the carbon chain. of those having a boiling point of 230° C. or lower are preferred. Among these, 3-methoxy-N,N-dimethylpropanamide is particularly preferable from the viewpoint of exhibiting the effects of the present invention.
  • the cyclic amide-based solvent for example, among the cyclic amide-based solvents represented by formulas (3) to (5), those having a boiling point of 230° C. or less can be preferably used.
  • R 4 is an optionally branched alkylene group having 3 to 5 carbon atoms
  • R 5 is hydrogen, an alkyl group having 1 to 4 carbon atoms, or an unsaturated hydrocarbon group. represent.
  • R 4 is preferably an alkylene group having 3 or more and 4 or less carbon atoms.
  • R5 is preferably hydrogen, an alkyl group having 1 to 2 carbon atoms, or an unsaturated hydrocarbon group.
  • R 14 is hydrogen, an optionally branched alkyl group having 1 to 4 carbon atoms, or an unsaturated hydrocarbon group, and R 15 represents an alkylene group having 1 to 4 carbon atoms.
  • R 16 and R 17 are each independently hydrogen, an optionally branched alkyl group having 1 to 4 carbon atoms, or an unsaturated hydrocarbon group, and R 18 is 1 to 4 carbon atoms. represents the following optionally branched alkylene group.
  • Cyclic amide solvents include N-vinylmethyloxazolidinone, 1,3-dimethyl-2-pyrrolidone, N-methyl-2-pyrrolidone, N-ethyl-2-pyrrolidone, ⁇ -lactam, 4-methoxy-1-methyl -2-pyrrolidinone, N-propyl-2-pyrrolidone, N-methyl-2-piperidinone, or those having a branched carbon chain structure or differences in the number of carbon atoms in their alkoxy or alkyl groups, those having a boiling point of 230°C or less is preferred.
  • N-methyl-2-pyrrolidone is particularly preferable from the viewpoint of exhibiting the effects of the present invention.
  • the content of the amide-based solvent having a boiling point of 230° C. or lower is not particularly limited, but is preferably in the range of 2% by mass or more, and preferably in the range of 5% by mass or more, based on the total amount of the ink composition. More preferably, it is 10% by mass or more. As a result, the ink composition has a higher drying property.
  • the content of the amide-based solvent having a boiling point of 230° C. or less is preferably 40% by mass or less, more preferably 35% by mass or less, and even more preferably 30% by mass or less in the total amount of the ink composition. .
  • an ink composition having good compatibility with other components and good ink storage stability can be obtained.
  • the amide-based solvent having a boiling point of 230°C or lower preferably contains at least two or more amide-based solvents.
  • the amide-based solvent having a boiling point of 230°C or lower preferably contains at least two or more amide-based solvents.
  • at least two or more amide solvents it is preferable that at least one amide solvent is an amide solvent of 200° C. or lower.
  • the ink composition has a high drying property and the productivity of the obtained recorded matter is further increased.
  • the ink composition according to the present embodiment may contain a water-soluble organic solvent other than the amide-based solvent having a boiling point of 230° C. or less.
  • diol-based solvents are preferred, alkanediol-based solvents are more preferred, and 1,2-alkanediol-based solvents are even more preferred.
  • Diol-based solvents are highly miscible with other components contained in the ink composition, and have lower volatility than amide-based solvents with a boiling point of 230° C. or less. is possible, and the ejection stability can be improved.
  • organic solvents B selected from the group consisting of cyclic ester-based solvents and glycol ether-based solvents.
  • the organic solvent B has a boiling point of 230° C. or lower and a water/1-octanol partition coefficient (LogP) of ⁇ 0.4 or more and 1.5 or less.
  • the content of the other water-soluble organic solvent is not particularly limited. is more preferably 10% by mass or more, and even more preferably 15% by mass or more. It is preferably 35% by mass or less, more preferably 30% by mass or less, and even more preferably 25% by mass or less, based on the total amount of the ink composition.
  • the ink composition according to this embodiment may contain water.
  • the water content is not particularly limited, but the lower limit of the water content is preferably in the range of 30% by mass or more, more preferably in the range of 45% by mass or more, based on the total amount of the ink composition. , 50% by mass or more.
  • the upper limit of the water content is preferably within the range of 85% by mass or less, more preferably within the range of 80% by mass or less, and within the range of 75% by mass or less in the total amount of the ink composition. is more preferred.
  • the solvent other than water in the ink composition when water is contained, the solvent other than water in the ink composition must be composed of a highly hydrophilic solvent from the standpoint of storage stability.
  • a water-soluble solvent is selected.
  • the drying property tends to deteriorate particularly in low-temperature drying, and the problem of the present invention that the drying property deteriorates occurs more remarkably. will do.
  • the ink composition according to the present embodiment contains an amide-based solvent having a predetermined boiling point or less, even if it is an aqueous ink composition containing water, it becomes possible to improve the drying property, and it is possible to obtain It is possible to increase the productivity of printed matter.
  • the ink composition according to this embodiment may contain a resin.
  • the ink composition according to the present embodiment does not necessarily contain a resin, but the resin can improve the abrasion resistance of the coating film.
  • the amide-based solvent having a boiling point of 230° C. or less contained in the ink composition according to the present embodiment acts as a film-forming aid, the drying temperature at a low temperature such as a temperature not higher than the Tg of the resin, for example,
  • the resin can be fused on the base material, and a coating film having sufficient abrasion resistance can be formed.
  • the ink composition according to the present embodiment is used as an overcoat ink, it is possible to impart suitable scratch resistance to a recorded matter by containing a resin.
  • a dispersible resin is preferable from the viewpoint of excellent fixability and excellent water resistance of the ink layer. Further, by forming a dispersible resin, the resin can be dispersed in the ink as fine resin particles by electrostatic repulsion or steric repulsion, and dispersion stability can be improved.
  • the dispersible resin is a resin that is dispersed in the ink composition in the form of particles, and means a resin that can be dispersed in the ink composition in the form of particles.
  • One or more resins selected from the group consisting of acrylamide-based resins, epoxy-based resins, polycarbonate-based resins, silicone-based resins, and polystyrene-based resins, or copolymer resins, or mixtures thereof can be used. .
  • These are preferable because they can improve not only water resistance but also solvent resistance.
  • at least one of the constituent monomers contains an acrylic resin or a copolymer with an acrylic resin having an acrylic skeleton. is preferred.
  • the Tg (glass transition temperature) of the resin contained in the ink composition according to the present embodiment is not particularly limited, it is preferably higher than the drying temperature of the ink composition. Specifically, the Tg of the resin is preferably 50° C. or higher, more preferably 55° C. or higher, and even more preferably 60° C. or higher. Originally, when the Tg of the resin contained in the ink composition becomes high, the resin cannot be fused onto the base material unless the drying temperature is increased, thereby imparting suitable scratch resistance to the recorded matter. becomes difficult. If the ink composition according to the present embodiment contains an amide-based solvent of 230° C. or less that acts as a film-forming aid, even if it contains a resin having a high Tg, the resin can be dried on the substrate at a low temperature. It is possible to fuse and impart suitable scratch resistance to the recorded matter.
  • dispersible resins include, for example, ACRYT WEM-031U, WEM-200U, WEM-321, WEM-3000, WEM-202U, WEM-3008 (manufactured by Taisei Fine Chemical Co., Ltd., acrylic-urethane dispersible resin). , AKW107, RKW-500 (manufactured by Taisei Fine Chemical Co., Ltd., acrylic dispersible resin), LUBRIJET N240 (manufactured by Lubrizol, acrylic dispersible resin), Superflex 150, 210, 470, 500M, E2000, E4800, R5002 (No.
  • the content of the resin (dispersible resin) contained in the ink composition is not particularly limited, but the lower limit of the resin content is 0.05 in the total amount of the ink. It is preferably at least 0.1% by mass, more preferably at least 0.5% by mass, and more preferably at least 1% by mass. Thereby, the scratch resistance of the coating film can be further improved.
  • the upper limit of the resin content is preferably 25% by mass or less, more preferably 20% by mass or less, and even more preferably 15% by mass or less, based on the total amount of the ink. This makes it possible to improve the ejection stability when the ink is ejected onto the surface of the substrate by an inkjet method.
  • the average particle size of the dispersible resin is preferably 30 nm or more, more preferably 40 nm or more, and even more preferably 50 nm or more, from the viewpoint of dispersion stability in the ink composition and inkjet dischargeability.
  • the average particle size of the dispersible resin is preferably 300 nm or less, more preferably 270 nm or less, and even more preferably 250 nm or less. This further improves the ejection stability of the ink composition. Further, when at least a portion of the resin contains a dispersible resin, the resin particles contained in the ink composition are more densely packed as the water-soluble organic solvent gradually volatilizes during film formation of the ink composition.
  • the ink composition according to the present embodiment contains an amide-based solvent having a boiling point of 230° C. or less that acts as a film-forming aid, the drying temperature at a low temperature such as a temperature not higher than the Tg of the resin, for example, Even so, the resin can be fused onto the base material, and the abrasion resistance and water abrasion resistance of the coating film can be further enhanced.
  • the average particle size of the dispersible resin can be measured using a concentrated particle size analyzer (manufactured by Otsuka Electronics Co., Ltd., model: FPAR-1000) at a measurement temperature of 25°C.
  • the mass average molecular weight of the dispersible resin is preferably 10,000 or more, more preferably 50,000 or more, and even more preferably 100,000 or more. From the viewpoint of dispersion stability in the ink composition, the mass average molecular weight of the dispersible resin is preferably 2,000,000 or less, more preferably 1,500,000 or less, and more preferably 1,000,000 or less. In the present embodiment, the molecular weight of the resin indicates the mass average molecular weight Mw, which is a value measured by GPC (gel permeation chromatography), using "HLC-8120GPC" manufactured by Tosoh Corporation. , can be measured using a polystyrene standard for a calibration curve as a standard.
  • GPC gel permeation chromatography
  • the ink composition according to this embodiment may contain a leveling agent. Although it is not essential that the ink composition according to the present embodiment contains a leveling agent, the inclusion of the leveling agent allows the ink composition applied on the substrate to spread more wetly.
  • the ink composition according to the present embodiment contains an amide-based solvent having a boiling point of 230° C. or less, so that the dot diameter of the obtained recorded matter increases and the surface area of the interface between the ink composition and the outside air increases. is dried more effectively, and the effects of the present invention are particularly effective.
  • the type of leveling agent is not particularly limited.
  • examples include surfactants such as anionic surfactants, nonionic surfactants, silicone (silicon) surfactants, fluorine surfactants, acetylene glycol surfactants, and alkane glycol surfactants. be able to.
  • the ink composition according to the present embodiment preferably contains a silicone surfactant.
  • Emal Latemul
  • Pelex Neoperex
  • Demol all of which are anionic surfactants; manufactured by Kao Corporation
  • Sunol Liporan, Lipon, and Ripal (all of which are anionic surfactants; Lion Co., Ltd.
  • a leveling agent with an HLB value of 15 or less is preferable. If the leveling agent has an HLB value of 15 or less, the leveling agent tends to be oriented at the interface between the ink composition applied on the substrate and the outside air, and the ink composition spreads more easily. The ink composition dries more effectively as the dot diameter of the recorded matter becomes larger.
  • the content of the leveling agent is the content of the amide-based solvent having a boiling point of 230° C. or less contained in the ink composition according to the present embodiment. It is preferable to control according to Amide-based solvents having a boiling point of 230° C. or less are relatively hydrophobic water-soluble organic solvents among water-soluble organic solvents. It becomes easy to dissolve in the amide-based solvent, and it may become difficult for the leveling agent to be oriented at the interface with the outside air. Therefore, by appropriately controlling the content of the amide-based solvent having a boiling point of 230° C. or less, the ink composition spreads out and dries effectively.
  • the content of the leveling agent is preferably in the range of 0.1 parts by mass or more with respect to 100 parts by mass of the amide solvent contained in the ink composition. As a result, the ink composition is further wetted and spread, so that the ink composition dries more effectively.
  • the range of 0.3 parts by mass or more is more preferable, the range of 0.6 parts by mass or more is even more preferable, and the range of 1.0 parts by mass or more is even more preferable.
  • the content of the leveling agent is preferably in the range of 50 parts by mass or less with respect to 100 parts by mass of the amide solvent contained in the ink composition. This improves the compatibility of the leveling agent with the amide solvent.
  • the range of 49 parts by mass or less is more preferable, and the range of 48 parts by mass or less is even more preferable.
  • the ink composition according to this embodiment may contain a coloring material.
  • the ink composition according to the present embodiment does not necessarily contain a coloring material. It is possible to use white ink or metallic ink that will serve as a base layer.
  • the colorant may be either a dye or a pigment.
  • the pigment that can be used in the ink composition according to the present embodiment is not particularly limited, and examples thereof include organic pigments and inorganic pigments used in conventional ink compositions. These may be used individually by 1 type, or may be used in combination of 2 or more type. Note that the ink composition according to the present embodiment may not contain a coloring material.
  • the dispersion stability of the pigment can be improved by using a dispersant or a dispersing aid (pigment derivative).
  • organic pigments include, for example, insoluble azo pigments, soluble azo pigments, derivatives from dyes, phthalocyanine-based organic pigments, quinacridone-based organic pigments, perylene-based organic pigments, perinone-based organic pigments, azomethine-based organic pigments, and anthraquinone-based pigments.
  • Organic pigments (anthrone-based organic pigments), xanthene-based organic pigments, diketopyrrolopyrrole-based organic pigments, dioxazine-based organic pigments, nickel azo-based pigments, isoindolinone-based organic pigments, pyranthrone-based organic pigments, thioindigo-based organic pigments, condensed azo organic solid solution pigments such as organic pigments, benzimidazolone organic pigments, quinophthalone organic pigments, isoindoline organic pigments, quinacridone solid solution pigments, perylene solid solution pigments, and other pigments such as lake pigments and carbon black. be done.
  • C.I. color index
  • azo dyes benzoquinone dyes, naphthoquinone dyes, anthraquinone dyes, cyanine dyes, squarylium dyes, croconium dyes, Merocyanine dyes, stilbene dyes, diarylmethane dyes, triarylmethane dyes, fluorane dyes, spiropyran dye
  • inorganic pigments that can be used in the ink composition according to the present embodiment include titanium oxide, barium sulfate, calcium carbonate, zinc oxide, barium carbonate, silica, talc, clay, synthetic mica, alumina, and zinc.
  • flower, lead sulfate, yellow lead, zinc yellow, red iron oxide (iron (III)), cadmium red, ultramarine blue, dark blue, chromium oxide green, cobalt green, amber, titanium black, aluminum, titanium, indium, synthetic iron black, Inorganic solid solution pigments and the like can be mentioned.
  • the average dispersed particle size of these organic pigments or inorganic pigments is not particularly limited as long as the desired color development is possible. Although it varies depending on the type of pigment, the lower limit of the average dispersed particle diameter of the pigment is preferably in the range of 10 nm or more, preferably 20 nm or more, from the viewpoint of obtaining sufficient coloring power with good dispersion stability of the pigment. It is more preferably within the range, and even more preferably within the range of 30 nm or more.
  • the upper limit of the average dispersed particle size of the pigment is preferably 500 nm or less, more preferably 400 nm or less, and even more preferably 350 nm or less.
  • the average dispersed particle size is 500 nm or less, nozzle clogging of an inkjet head is unlikely to occur, and a uniform image with high reproducibility can be obtained.
  • the average dispersed particle diameter is 10 nm or more, the light resistance of the resulting printed matter can be improved.
  • the average dispersed particle diameter of the pigment is the average particle diameter ( D50).
  • the ink composition according to the present embodiment may contain a luster pigment as a pigment.
  • Luminous pigments include metal-containing luster pigments that are at least one of simple metals such as aluminum, silver, gold, nickel, chromium, tin, zinc, indium, titanium, and copper; metal compounds; alloys and mixtures thereof; Pearl pigments having pearl luster or interference luster such as mica, fish scale foil, bismuth oxychloride, silicon dioxide, metal oxides, metal compounds, and laminates thereof may be mentioned.
  • the glitter pigment preferably has a plate-like shape (also referred to as a fine plate-like shape, a scale-like shape, or the like). This makes it possible to impart a more suitable metallic luster to the subject.
  • the content of the coloring material is preferably 0.05% by mass or more, more preferably 0.08% by mass or more, based on the total amount of the ink composition. is more preferable, and 0.1% by mass or more is even more preferable.
  • the content of the coloring material is preferably 20.0% by mass or less, and 17.0% by mass or less, based on the total amount of the ink composition. is more preferable, and 15.0% by mass or less is even more preferable.
  • the ink composition according to this embodiment may contain a pigment dispersant.
  • the ink composition according to the present embodiment does not necessarily contain a pigment dispersant, but by containing the pigment dispersant together with the pigment, the dispersibility of the pigment can be improved.
  • pigment dispersant means a resin or surfactant that adheres to a part of the pigment surface and has a function of improving the dispersibility of the pigment in the ink composition.
  • the pigment dispersant that can be used in the ink composition according to the present embodiment is not particularly limited.
  • cationic, anionic, nonionic, amphoteric, silicone (silicon), and fluorine surfactants can be used.
  • surfactants polymer surfactants (polymer dispersants) such as those exemplified below are preferable.
  • a water-soluble polymer dispersant can be preferably used as a pigment dispersant that can be used in the ink composition according to the present embodiment.
  • water-soluble polymer dispersants include polyester-, polyacrylic-, polyurethane-, polyamine-, and polycaptolactone-based main chains, and side chains containing amino, carboxy, sulfo, and hydroxy groups.
  • (co)polymers of unsaturated carboxylic acid esters such as polyacrylic acid esters; copolymers of aromatic vinyl compounds such as styrene and ⁇ -methylstyrene and unsaturated carboxylic acid esters such as acrylic acid esters; (partial) amine salts, (partial) ammonium salts and (partial) alkylamine salts of (co)polymers of unsaturated carboxylic acids such as polyacrylic acid; hydroxyl group-containing unsaturated carboxylic acid esters such as hydroxyl group-containing polyacrylic acid esters Polyurethanes; Unsaturated polyamides; Polysiloxanes; Long-chain polyaminoamide phosphates; Polyethyleneimine derivatives (poly (lower alkylene imine) and free carboxyl group-containing polyester amides obtained by reaction and their bases); polyallylamine derivatives (polyallylamine and polyester having a free carboxyl group
  • water-soluble polymer dispersant examples include Cray Valley's SMA1440, SMA2625, SMA17352, SMA3840, SMA1000, SMA2000, SMA3000, BASF Japan's JONCRYL67, JONCRYL678, JONCRYL586, JONCRYL611, JONCRYL680, JONCRYL682, JONCRYL690, JONCRYL819, JONCRYL -JDX5050, EFKA4550, EFKA4560, EFKA4585, EFKA5220, EFKA6230, Dispex Ultra PX4575, Lubrizol SOLSPERSE20000, SOLSPERSE27000, SOLSPERSE40000, SOLSPERSE410 00, SOLSPERSE41090, SOLSPERSE43000, SOLSPERSE44000, SOLSPERSE45000, SOLSPERSE46000, SOLSPERSE47000, SOLSPERSE53095, SOLSPERSE54000,
  • the ink according to this embodiment may contain a cationic compound.
  • the ink composition according to the present embodiment does not necessarily contain a cationic compound. can do.
  • the coloring ink containing the coloring material is anionic.
  • cationic compounds include polyvalent metal salts (polyvalent metal ions) and cationic resins.
  • Polyvalent metal salts mainly contain ions and anions of polyvalent metals.
  • the concept of "containing a polyvalent metal salt” includes not only those to which a polyvalent metal salt is added during preparation of the receiving solution, but also compounds capable of generating polyvalent metal ions and compounds capable of generating anions. and are added at the time of preparation of the receiving solution to contain the polyvalent metal ions and the anions constituting the polyvalent metal salt.
  • the anion may be an anion of an inorganic substance or an anion of an organic substance.
  • the anions preferably include organic anions.
  • inorganic anions include chloride ions, bromide ions, nitrate ions, and sulfate ions.
  • organic anions include acetic acid, benzoic acid, salicylic acid, 2,4-dihydroxybenzoic acid, 2,5-dihydroxybenzoic acid, dimethylolpropionic acid, pantothenic acid, succinic acid, maleic acid, glutaric acid, Mention may be made of the anions of suberic acid, trimellitic acid, methylmalonic acid.
  • a polyvalent metal ion is an ion of a metal with a valence of at least two. Bleeding of the ink composition can be suppressed by using polyvalent metal ions.
  • polyvalent metal ions include calcium ions, magnesium ions, aluminum ions, titanium ions, iron (II) ions, iron (III) ions, cobalt ions, nickel ions, copper ions, zinc ions, barium ions, strontium ions, and the like. is mentioned.
  • one selected from calcium ions, magnesium ions, nickel ions, zinc ions, and aluminum ions because it has a large interaction with the colorant in the ink composition and has a high effect of suppressing bleeding and unevenness. It is preferable to contain the above.
  • the cationic compound may contain a cationic resin having a cationic group instead of the polyvalent metal salt.
  • cationic resins include resins having cationic groups such as amino groups, ammonium groups, amide groups, and --NHCONH2 groups.
  • the cationic resin can be synthesized by a known method, or a commercially available product can be used.
  • Examples of commercially available products are as follows: APC-810, 815; D-6010, 6020, 6030, 6040, 6050, 6060, 6080, 6310; FQP-1264 ; RSL-18-22, 4071H, 4400, 8391, 8391H, HD70C, HF70D; WS-72 (manufactured by SNF), Arafix 100, 251S, 255, 255LOX (manufactured by Arakawa Chemical), DK-6810, 6853, 6885 WS-4010, 4011, 4020, 4024, 4027, 4030 (manufactured by Seiko PMC), Senka F-300; Papiogen P-105, P-113, P-271, P-316; Pitchnol QG5A; Myriogen P- 20; Unisense FPA100L, FPA101L, FPA
  • the cationic resin may be a water-soluble cationic resin that dissolves in water or a water-soluble organic solvent, or a dispersible cationic resin that disperses in water or a water-soluble organic solvent.
  • the cationic resin is preferably a dispersible cationic resin.
  • the coating film resistance (scratch resistance) of the ink composition layer can be improved.
  • the cationic compound contains a polyvalent metal ion and a dispersible cationic resin, or the cationic compound contains a water-soluble cationic resin and a dispersible cationic resin. more preferably.
  • the ink composition layer can be coated while suppressing bleeding of the colored ink more effectively.
  • Film resistance shock resistance
  • the content of the cationic compound is not particularly limited. It is preferably in the range of 5% by mass or more, more preferably in the range of 0.8% by mass or more, and even more preferably in the range of 1.0% by mass or more. When the content of the cationic compound is within the range of 0.5% by mass or more based on the total amount of the ink composition, it becomes possible to fix the coloring material more effectively, and the bleeding of the colored ink is effectively suppressed. can do.
  • the upper limit of the content of the cationic compound is preferably within the range of 9% by mass or less, more preferably within the range of 8% by mass or less, and within the range of 7% by mass or less in the total amount of the ink composition. is more preferable. When the content of the cationic compound is within the range of 9% by mass or less based on the total amount of the ink composition, the storage stability of the ink composition is improved.
  • the ink composition may further contain conventionally known additives, if necessary.
  • additives include waxes, viscosity modifiers, pH modifiers, antioxidants, preservatives, antifungal agents, and the like.
  • a method for preparing the ink composition is not particularly limited. For example, a method of adding a self-dispersing pigment, a resin, a surfactant and, if necessary, other components to a water-soluble organic solvent for preparation, a method of adding a pigment and a dispersant to a water-soluble organic solvent, and then dispersing , A method of adding a resin, a surfactant and other ingredients if necessary. After adding the pigment, resin, surfactant and other ingredients if necessary to a water-soluble organic solvent, the pigment is dispersed. and the like.
  • the surface tension of the ink composition is not particularly limited, but the upper limit of the static surface tension at 25° C. is preferably 40.0 mN/m or less, more preferably 35.0 mN/m or less, and 32.0 mN/m or less. More preferred.
  • the lower limit of the static surface tension at 25°C is preferably 19.0 mN/m or more, more preferably 20.0 mN/m or more, and even more preferably 21.0 mN/m or more.
  • the static surface tension can be measured, for example, by the Wilhelmy method (DY-300 manufactured by Kyowa Interface Science) at a measurement temperature of 25°C.
  • the conductivity of the ink composition is not particularly limited, it is preferably 2500 ⁇ S/cm or less.
  • the conductivity of the ink composition is preferably 2500 ⁇ S/cm or less.
  • the conductivity of the ink composition is preferably 2450 ⁇ S/cm or less, more preferably 2400 ⁇ S/cm or less.
  • the electrical conductivity can be measured at 25° C. with EC Testr 11+ manufactured by Eutech Instruments, for example.
  • the above ink composition may be a colored ink, a metallic ink or the like, a receiving solution containing a cationic compound, or a clear ink containing no coloring material, and may be an overcoat ink.
  • the ink set according to the present embodiment may be an ink set in which these ink compositions are combined.
  • one ink composition contained in the ink set is a colored ink composition (C) containing a coloring material
  • the other ink composition contained in the ink set contains a cationic compound.
  • the ink set that is the receiving solution (P) and one ink composition contained in the ink set are the overcoat inks (O) that form an overcoat layer on the surface of the object, and the other ink compositions contained in the ink set.
  • the ink composition is an ink set that is a receiving solution (P) containing a cationic compound, and one ink composition included in the ink set is a colored ink composition (C) that contains a coloring material, and the ink Other ink compositions included in the set include an ink set that is an overcoat ink (O) that forms an overcoat layer on the surface of a substrate.
  • P receiving solution
  • C colored ink composition
  • O overcoat ink
  • the ink set may be a combination of colored ink compositions (C) containing a coloring material. ink, red ink) or light colored ink compositions (for example, light magenta ink, light cyan ink, light black ink).
  • an ink set containing a white ink composition containing a white colorant, a yellow ink composition, a magenta ink composition, a cyan ink composition, and a black ink composition and a white ink composition containing a white colorant and a yellow ink composition, a magenta ink composition, a cyan ink composition, a black ink composition, and an intermediate color ink composition or a light color ink composition of yellow, magenta, cyan, and black.
  • an ink set containing a metallic ink containing a glitter pigment, a yellow ink composition, a magenta ink composition, a cyan ink composition, and a black ink composition containing a metallic ink containing a glitter pigment and a yellow ink composition
  • a metallic ink containing a glitter pigment and a yellow ink composition A magenta ink composition, a cyan ink composition, a black ink composition, and intermediate color ink compositions or light color ink compositions of yellow, magenta, cyan, and black.
  • the conductivity is preferably 1000 ⁇ S/cm or less. Since the coloring ink composition (C) containing the coloring material contains the coloring material (pigment) in the coloring ink composition (C), when the conductivity is high, the coloring material (pigment) tends to aggregate and become less stable.
  • the colored ink composition (C) contains components such as a colorant dispersant (pigment dispersant) and a leveling agent (surfactant) that disperse the colorant (pigment) so that the conductivity is 1000 ⁇ S/cm or less. By doing so, it is possible to suppress the interaction between the components (especially between the coloring materials), and it is possible to further improve the stability.
  • the electrical conductivity of the colored ink composition (C) is more preferably 950 ⁇ S/cm or less, even more preferably 900 ⁇ S/cm or less.
  • the electrical conductivity of the overcoat ink (O) is preferably 1000 ⁇ S/cm or less.
  • the overcoat ink (O) that forms the overcoat layer on the surface of the object contains a resin for forming the overcoat layer. tend to decline.
  • the electrical conductivity of the overcoat ink (O) is 1000 ⁇ S/cm or less. interaction can be suppressed, and the stability can be further improved.
  • the conductivity of the overcoat ink (O) is more preferably 950 ⁇ S/cm or less, even more preferably 900 ⁇ S/cm or less.
  • the electrical conductivity of the receiving solution (P) is preferably 1000 ⁇ S/cm or more and 2500 ⁇ S/cm or less. Since the receiving solution (P) contains a cationic compound, the receiving solution (P ) while maintaining the storage stability of the receiving solution (P), it is possible to improve the reactivity with the colored ink (C) and the overcoat ink (O) that land on the receiving solution (P), suppressing bleeding and unevenness. It becomes possible to
  • the electrical conductivity of the receiving solution (P) is more preferably 1050 ⁇ S/cm or higher, more preferably 1100 ⁇ S/cm or higher.
  • the recording method according to the present embodiment is a recording method in which the ink composition described above is applied onto a substrate by an inkjet method.
  • this ink composition contains an amide-based solvent having a boiling point of 230° C. or less and is highly drying, it can be applied onto a substrate by an inkjet method according to the recording method according to the present embodiment. can be recorded at high speed.
  • the partition coefficient (LogP) of water/1-octanol of this amide solvent with a boiling point of 230° C. or less is ⁇ 0.6 or more, the solvent permeability to the substrate is high, especially the absorption Bleeding on a flexible base material or a vinyl chloride base material (vinyl chloride resin base material) is further suppressed, making it possible to produce clear recorded matter.
  • the maximum recording speed in the recording method according to the present embodiment is 7.5 m 2 /h or more in the case of the serial method, although it depends on the type of the base material, the type of the ink jet recording apparatus, and the like. It is preferably 10 m 2 /h or more, more preferably 15 m 2 /h or more. In the case of the single pass method, the speed is preferably 30 m/min or more, more preferably 40 m/min or more, and even more preferably 50 m/min or more.
  • the drying temperature in the recording method according to the present embodiment may be 80°C or lower, preferably 70°C or lower, and more preferably 60°C or lower.
  • the above-described recording method can also be defined as a method for producing a recorded matter in which the above-described ink composition is applied onto a substrate by an inkjet method.
  • the base material (recording medium) that can be used in the recording method according to the present embodiment is not particularly limited.
  • Various substrates can be used, such as an absorbent substrate such as a woven fabric, or a surface-coated substrate such as a substrate having a receiving layer. The same applies to the base material that can be used in the method of manufacturing a recorded matter according to an embodiment described later.
  • non-absorbent substrates include resin substrates such as polyester resins, polypropylene synthetic paper, polypropylene resins, polyethylene resins, acrylic resins, styrene resins, polycarbonate resins, ABS resins, vinyl chloride resins, polyimide resins, Metal, metal foil coated paper, glass, synthetic rubber, natural rubber and the like can be mentioned.
  • resin substrates such as polyester resins, polypropylene synthetic paper, polypropylene resins, polyethylene resins, acrylic resins, styrene resins, polycarbonate resins, ABS resins, vinyl chloride resins, polyimide resins, Metal, metal foil coated paper, glass, synthetic rubber, natural rubber and the like can be mentioned.
  • absorbent substrates include dry paper, medium-quality paper, high-quality paper, synthetic paper, cotton, synthetic fiber fabric, silk, hemp, fabric, non-woven fabric, leather, and the like.
  • Examples of surface-coated substrates include coated paper, art paper, cast paper, lightweight coated paper, and lightly coated paper.
  • the layer of the ink composition is a layer formed by volatilization of the solvent contained in the ink composition described above. For example, when a coloring material is contained in the ink, it becomes a decorative layer forming a desired image and its underlying layer.
  • the above-described ink composition when used as a receiving solution containing a cationic compound, the above-described ink composition (receiving solution) is applied onto a substrate, and the above-described ink composition (coloring ink) is applied thereon. ) may be applied, or the above-described ink composition (receiving solution) is applied on the substrate, and an ink composition (colored ink) different from the above-described ink composition (colored ink) is applied thereon. You may
  • the ink composition described above when used as an overcoat ink, it becomes an overcoat layer formed on the surface of a recorded matter.
  • the ink composition that forms the recording layer of the recorded matter may be the ink composition described above, or may be an ink composition different from the ink composition described above.
  • the inkjet recording apparatus is an inkjet recording apparatus equipped with a container filled with the ink composition described above or the ink composition contained in the ink set described above. Since the above-described ink composition has high drying properties, an inkjet recording apparatus equipped with a container filled with the above-described ink composition or the ink composition contained in the above-described ink set can be used to quickly print a printed matter. can be manufactured.
  • the storage container mounted on the inkjet recording apparatus is not particularly limited, and examples include containers such as ink bottles, pouches, bag-in-boxes, and drums. Also, these containers may be further housed in a cartridge or the like.
  • the material of the storage container is not particularly limited, and may be a conventionally known resin, or a material containing a part of metal material (for example, an aluminum pouch having an aluminum deposition layer). .
  • this apparatus include a drying mechanism for drying the ink composition after the ink composition is ejected. This makes it possible to effectively remove volatile components contained in each ink composition.
  • the drying mechanism for drying the ink after ejection of the ink composition is not particularly limited, and may be a heater or the like, or a mechanism for blowing hot air or normal temperature air.
  • the ink composition applied on the substrate at a temperature lower than the Tg of the resin contained in the ink composition. Since the above ink composition is highly drying, it can be sufficiently dried even at a temperature lower than the Tg of the resin contained in the ink composition.
  • the ejection method in each ejection part may be any method such as a piezo method, a thermal method, or an electrostatic method.
  • Drying properties of the ink compositions of Examples and Comparative Examples were evaluated. Specifically, after applying 5 g/m 2 of the ink composition onto a vinyl chloride resin substrate with a bar coater, the ink composition was placed in an oven at 60° C. and the time until drying was evaluated by touch. The surface was touched with a finger every 30 seconds, and the time until the ink composition stopped adhering was measured, and evaluation was performed based on the following evaluation criteria. The evaluation results are shown in the table below (indicated as "drying property" in the table). Evaluation Criteria A: Dried in 3 minutes. B: Dried in 3.5 to 4 minutes. C: Dried in 4.5 to 5 minutes. D: Dried in 5.5 to 6 minutes. E: Not dried in 6 minutes (out of practical range).
  • Storage stability was evaluated for the ink compositions of Examples and Comparative Examples. Specifically, the ink composition was heated in an oven at 60° C. for one week, and the viscosity before and after heating was measured at a liquid temperature of 25° C., and evaluated based on the following evaluation criteria. The evaluation results are shown in the table below (indicated as "storage stability" in the table). Evaluation Criteria A: Viscosity change rate of 5% or less B: Viscosity change rate of more than 5% and less than 10% C: Viscosity change rate of 10% or more and less than 20% D: Viscosity change rate of 20% or more (outside practical range)
  • Density unevenness Density unevenness was evaluated for recorded matter obtained with the ink compositions of Examples and Comparative Examples. Specifically, the ink composition is filled in an ink cartridge (container), and the ink cartridge (container) is mounted on a serial head type inkjet recording apparatus. A solid image with a droplet size of 6 pl and a printing density of 100% was printed on a vinyl chloride resin substrate, and the presence or absence of density unevenness was visually observed, and evaluation was made based on the following evaluation criteria. The evaluation results are shown in the table below (denoted as "density unevenness" in the table). Evaluation Criteria A: No density unevenness B: Density unevenness C: Image formation not possible due to poor ink wetting (outside practical range)
  • Liquid repellency Liquid repellency was evaluated for the ink compositions of Examples and Comparative Examples. Specifically, the nozzle plate of a 600 dpi printer head in an inkjet recording apparatus is immersed in the ink composition, and the exposed area of the ink composition on the plate after being removed from the liquid surface is visually observed every 30 seconds. was evaluated based on the evaluation criteria of The evaluation results are shown in the table below (indicated as "liquid repellency" in the table). Evaluation criteria A: The exposed area of the plate after 30 seconds is 80% or more B: The exposed area of the plate after 1 minute is 80% or more C: The exposed area of the plate is less than 80% even after 1 minute (outside the practical range)
  • the intermittent discharge properties of the ink compositions of Examples and Comparative Examples were evaluated. Specifically, the ink composition is filled in an ink cartridge (container), the ink cartridge (container) is mounted in a serial head type inkjet recording apparatus, and a nozzle check pattern is printed by the inkjet recording apparatus. Then, after standing still for a certain period of time, the same printing was performed. The presence or absence of nozzle chipping was checked before and after standing, and evaluation was performed based on the following evaluation criteria. The evaluation results are shown in the table below (indicated as "intermittent discharge property" in the table). Evaluation Criteria A: 10% or less nozzle missing after standing for 15 minutes B: 10% or less nozzle missing after standing for 10 minutes C: 10% or less nozzle missing after standing for 5 minutes D: more than 10% nozzle missing after standing for 5 minutes (out of practical range)
  • the scratch resistance was evaluated for the ink compositions of Examples and Comparative Examples. Specifically, a coating film was dried at 60° C. for 6 minutes in the same manner as in the above dryness evaluation, and the coating film on the coated surface of the ink composition was subjected to a Gakushin type rubbing fastness tester type II, The appearance of the coating film was observed under the conditions of a weight of 500 g and a cloth of Kanawa No. 3. The evaluation results are shown in the table below (indicated as "scratch resistance" in the table).
  • the ink compositions of Examples containing an amide-based solvent having a boiling point of 230°C or lower are excellent in drying properties.
  • Examples 1 to 11 in which the type of amide solvent having a boiling point of 230°C or lower was changed, Examples 1 to 4, 6, 7, and 9 containing an amide solvent having a boiling point of 220°C or lower , and 11, even when compared with the ink compositions of Examples 5, 8, and 10, the "drying property" evaluation was even better.
  • the ink compositions of Examples 12, 16, and 18 to 23 containing a leveling agent evaluated the "drying property" and "bleeding" of the obtained recorded matter. was good in Further, in the ink compositions of Examples 12, 16, 18, and 19 in which the HLB value of the leveling agent was changed, the ink compositions of Examples 12 and 16 containing a leveling agent having an HLB value of 15 or less were Even when compared with the ink compositions of Examples 18 and 19, the "drying property" and "bleeding" evaluations were even better.
  • the ink compositions of Examples 12, 25, and 26 containing a resin had better "scratch resistance" than the ink composition of Example 24 containing no resin.
  • the ink compositions of Examples 12 and 25 containing a resin having a Tg of 50° C. or more were even more favorable in the evaluation of "scratch resistance" than the ink composition of Example 26.
  • the ink compositions (receiving solutions) of Examples 27 and 28 containing cationic compounds had even better "storage stability" evaluations when compared to the ink composition of Example 28 (accepting solution).
  • the content of the amide solvent with a boiling point of 230°C or lower was 6% by mass or more.
  • the ink compositions of Examples 1, 12, 32, and 34, in which the content of the amide-based solvent having a boiling point of 230° C. or less was in the range of 35% by mass or less were compared with the ink composition of Example 35.
  • the "storage stability" rating was even better.
  • the "1,3-propanediol" of Examples 12, 16, and 29 containing N,N-diethylformamide as an amide-based solvent having a boiling point of 230°C or less and further containing 1,3-propanediol.
  • the 1,2-alkanediol solvent "propylene glycol” was changed, the "bleeding" evaluation for the PET film was even better.
  • Example 48 containing a dispersible cationic resin as a cationic compound was " The "scratch resistance” evaluation was even better.
  • the ink composition of the comparative example which does not contain an amide-based solvent having a boiling point of 230°C or less, does not exhibit the effects of the present invention.
  • an ink set containing an amide-based solvent with a boiling point of 230° C. or less has excellent drying properties.
  • Example 27 having a conductivity of 1000 ⁇ S/cm or more and 2500 ⁇ S/cm or less and the ink composition of Example 12 having a conductivity of 1000 ⁇ S/cm or less.
  • the ink set of Example 37 containing .
  • the ink sets of Examples 51 and 55 were compared with the ink sets of Examples 50 and 54. "Scratch resistance" is good.
  • the ink sets of Examples 51 and 55 contain the ink composition of Experimental Example 47 containing a silicone surfactant. From this, it was confirmed that an ink set containing an ink composition containing a silicone (silicon)-based surfactant can form a coating film with high scratch resistance.
  • Example 52, 53, 56, and 57 containing the ink composition (receiving solution) of Example 48 containing a dispersible cationic resin as a cationic compound were the inks of Example 27. Even when compared to the ink sets of Examples 50 and 54 containing the composition (receiving solution), the "scratch resistance" rating was even better.

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Abstract

L'invention concerne une composition d'encre qui présente des caractéristiques de séchage élevées et atteint une productivité élevée pour un produit enregistré à obtenir.　La composition d'encre pour jet d'encre contient un solvant organique soluble dans l'eau. Le solvant organique soluble dans l'eau contient un solvant à base d'amide préentant un point d'ébullition de 230 °C ou moins.
PCT/JP2023/006538 2022-02-22 2023-02-22 Composition d'encre, jeu d'encres, produit enregistré présentant une composition d'encre appliquée sur un matériau de base, procédé d'enregistrement, procédé de fabrication d'un produit enregistré et dispositif d'enregistrement à jet d'encre équipé d'un récipient de stockage rempli de la composition d'encre WO2023163063A1 (fr)

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