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WO2025154438A1 - Ensemble encres, procédé d'impression à jet d'encre et dispositif d'enregistrement - Google Patents

Ensemble encres, procédé d'impression à jet d'encre et dispositif d'enregistrement

Info

Publication number
WO2025154438A1
WO2025154438A1 PCT/JP2024/043930 JP2024043930W WO2025154438A1 WO 2025154438 A1 WO2025154438 A1 WO 2025154438A1 JP 2024043930 W JP2024043930 W JP 2024043930W WO 2025154438 A1 WO2025154438 A1 WO 2025154438A1
Authority
WO
WIPO (PCT)
Prior art keywords
ink
pigment
pigment dispersion
treatment liquid
aqueous
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/JP2024/043930
Other languages
English (en)
Japanese (ja)
Inventor
晃央 前田
直人 新妻
諒 田口
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Konica Minolta Inc
Original Assignee
Konica Minolta Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Konica Minolta Inc filed Critical Konica Minolta Inc
Publication of WO2025154438A1 publication Critical patent/WO2025154438A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D11/00—Inks
    • C09D11/30—Inkjet printing inks
    • C09D11/40—Ink-sets specially adapted for multi-colour inkjet printing
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D11/00—Inks
    • C09D11/54—Inks based on two liquids, one liquid being the ink, the other liquid being a reaction solution, a fixer or a treatment solution for the ink

Definitions

  • the present invention relates to an ink set, an inkjet recording method, and a recording device.
  • a printer to print on a recording medium on a packaging machine, a printer must be installed on the packaging machine, which limits the position space for the recording head and the drying space.
  • spot colors such as corporate colors, and even in such cases, there is a demand for higher quality and a wider variety of color expression.
  • the amount of ink applied becomes too great, resulting in a trade-off between drying performance and productivity, and the drying device must be made larger to compensate for this.
  • the printing device also becomes larger as the number of recording heads increases, creating the problem that it cannot be installed on a packaging machine. There is also the problem that it cannot handle a wide color gamut.
  • Patent Document 1 uses a two-liquid ink set that contains two types of ink compositions and a reaction liquid that causes the inks to aggregate during image formation. The reactivity of the two types of ink with respect to the reaction liquid is then made uniform.
  • the absolute value of the difference in particle size between the pigment dispersion A and the pigment dispersion B is less than 80 nm.
  • the aqueous pigment ink contains pigment dispersions A, B, and C, and is an ink that aggregates when mixed with the treatment liquid.
  • the absorbance attributable to the pigment dispersion in the supernatant liquid after centrifuging a 1:1 mixture of the aqueous pigment ink and a 5-fold diluted aqueous solution of the treatment liquid can also be regarded as the absorbance of the unreacted components of the aqueous pigment ink.
  • the absorbance at the maximum absorption maximum wavelength attributable to the pigment dispersion X in the supernatant liquid after centrifuging a 1:1 mixture of the aqueous pigment ink and a 5-fold diluted aqueous solution of the treatment liquid is defined as "X aft ".
  • a aft and B aft are values obtained by subtracting the absorbance from one of the pigment dispersions as a base.
  • the water-based pigment ink constituting the two-liquid ink set of the present invention is characterized in that the water-based pigment ink aggregates when the water-based pigment ink is mixed with the treatment liquid constituting the two-liquid ink set.
  • the water-based pigment ink can be ejected by inkjet.
  • the aqueous pigment ink according to the present invention contains a pigment dispersion, and the pigment dispersion is obtained by adding a pigment dispersant to a pigment.
  • the aqueous pigment ink according to the present invention contains a pigment and a pigment dispersant.
  • the aqueous pigment ink preferably contains a fixing resin, a water-soluble solvent, a surfactant, a wax, and water.
  • the aqueous pigment ink may contain other known additives, etc., which are appropriately selected.
  • any conventionally known pigment can be used without any particular restrictions, and for example, inorganic pigments such as titanium oxide, insoluble pigments, and organic pigments such as lake pigments can be preferably used.
  • Titanium oxide has three crystal forms: anatase, rutile, and brookite, but the most commonly used are broadly classified into anatase and rutile. Although not particularly limited, rutile is preferred, as it has a high refractive index and high hiding power. Specific examples include the TR series from Fuji Titanium Industry Co., Ltd., the JR series from Teika Corporation, and Typeque from Ishihara Sangyo Co., Ltd.
  • organic pigments that can be preferably used include pigments for magenta or red, pigments for orange or yellow, pigments for green or cyan, and pigments for black.
  • orange or yellow pigments examples include C.I. Pigment Orange 31, C.I. Pigment Orange 43, C.I. Pigment Yellow 12, C.I. Pigment Yellow 13, C.I. Pigment Yellow 14, C.I. Pigment Yellow 15, C.I. Pigment Yellow 15:3, C.I. Pigment Yellow 17, C.I. Pigment Yellow 74, C.I. Pigment Yellow 93, C.I. Pigment Yellow 128, C.I. Pigment Yellow 94, C.I. Pigment Yellow 138, and C.I. Pigment Yellow 1155.
  • C.I. Pigment Yellow 1155 is preferred in terms of the balance between color tone and lightfastness.
  • pigments for green or cyan examples include C.I. Pigment Blue 15, C.I. Pigment Blue 15:2, C.I. Pigment Blue 15:3, C.I. Pigment Blue 16, C.I. Pigment Blue 60, and C.I. Pigment Green 7.
  • polymeric dispersants include block copolymers and random copolymers having a structure derived from two or more monomers selected from styrene, styrene derivatives, vinylnaphthalene derivatives, acrylic acid, acrylic acid derivatives, maleic acid, maleic acid derivatives, itaconic acid, itaconic acid derivatives, fumaric acid, and fumaric acid derivatives, as well as salts thereof, polyoxyalkylenes, and polyoxyalkylene alkyl ethers.
  • the neutralizing base there are no particular limitations on the neutralizing base, but it is preferable to use an organic base such as ammonia, monoethanolamine, diethanolamine, triethanolamine, or morpholine.
  • an organic base such as ammonia, monoethanolamine, diethanolamine, triethanolamine, or morpholine.
  • the pigment is titanium oxide, it is preferable that the titanium oxide is dispersed with a polymer dispersant having an acryloyl group.
  • the amount of polymer dispersant added is preferably within the range of 10 to 100% by mass relative to the pigment, and more preferably within the range of 10 to 40% by mass.
  • the pigment has the form of a so-called capsule pigment, in which the pigment is coated with the polymer dispersant.
  • a method for coating the pigment with the polymer dispersant various known methods can be used, but preferred examples include the phase inversion emulsification method, the acid precipitation method, a method in which the pigment is dispersed in a polymerizable surfactant, a monomer is supplied thereto, and coating is performed while polymerizing, and a method in which the pigment dispersion is crosslinked with an epoxy crosslinking agent, etc.
  • the average particle size of the pigment particles in the ink in a dispersed state is preferably within the range of 40 to 300 nm. In particular, the average particle size is preferably within the range of 50 to 150 nm. This improves the dispersion stability of the pigment, and the storage stability of the ink.
  • the particle size of pigments can be measured using commercially available particle size measuring devices that use dynamic light scattering, electrophoresis, etc.
  • measurement using dynamic light scattering is simple and can measure the particle size range with high accuracy.
  • the pigment can be dispersed using a dispersing machine together with a dispersant and other additives required for the desired purpose.
  • dispersing the pigment using a sand mill is preferable because it results in a sharp particle size distribution.
  • the material of the beads used for sand mill dispersion but from the viewpoint of preventing the generation of bead fragments and contamination of ionic components, it is preferable for the beads to be zirconia or zircon.
  • the diameter of the beads it is preferable for the beads to be within the range of 0.1 to 3 mm.
  • the pigment content in the ink there are no particular limitations on the pigment content in the ink, but for titanium oxide, the preferred range is 7 to 18% by mass, and for organic pigments, the preferred range is 0.5 to 7% by mass.
  • the polyester resin having a polyester skeleton as the water-insoluble resin fine particles can be obtained by using a polyhydric alcohol component and a polycarboxylic acid component such as a polycarboxylic acid, a polycarboxylic anhydride, or a polycarboxylic ester.
  • the polyhydric alcohol component may, for example, be a dihydric alcohol (diol).
  • dihydric alcohol examples include alkylene glycols having 2 to 36 carbon atoms, alkylene ether glycols having 4 to 36 carbon atoms, alicyclic diols having 6 to 36 carbon atoms, and alkylene oxide adducts of the alicyclic diols having 2 to 4 carbon atoms.
  • bisphenols may be used. These may be used alone or in combination of two or more.
  • alkylene glycols having 2 to 36 carbon atoms examples include ethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, 1,4-butylene glycol, and 1,6-hexanediol.
  • alkylene ether glycols having 4 to 36 carbon atoms examples include diethylene glycol, triethylene glycol, dipropylene glycol, polyethylene glycol, polypropylene glycol, and polybutylene glycol.
  • Examples of alicyclic diols with carbon atoms ranging from 6 to 36 include 1,4-cyclohexanedimethanol and hydrogenated bisphenol A.
  • alkylene oxide adducts (molar number of additions in the range of 1 to 30) having 2 to 4 carbon atoms of the alicyclic diol include ethylene oxide adducts, propylene oxide adducts, and butylene oxide adducts.
  • ethylene oxide will be abbreviated as "EO”, "propylene oxide” as “PO”, and "butylene oxide” as “BO”.
  • Bisphenols include, for example, alkylene oxide (EO, PO, BO, etc.) adducts (number of moles added ranges from 2 to 30) of bisphenol A, bisphenol F, bisphenol S, etc., having 2 to 4 carbon atoms. These may be used alone or in combination of two or more types.
  • polyvalent carboxylic acid component examples include divalent carboxylic acids (dicarboxylic acids).
  • divalent carboxylic acids include alkane dicarboxylic acids having 4 to 36 carbon atoms, alkenyl succinic acids, alicyclic dicarboxylic acids having 4 to 36 carbon atoms, alkene dicarboxylic acids having 4 to 36 carbon atoms, and aromatic dicarboxylic acids having 8 to 36 carbon atoms. These may be used alone or in combination of two or more.
  • alkanedicarboxylic acids having 4 to 36 carbon atoms include succinic acid, avidinic acid, and sebacic acid.
  • alkenyl succinic acids examples include dodecenyl succinic acid.
  • Examples of alicyclic dicarboxylic acids having 4 to 36 carbon atoms include dimer acid (dimerized linoleic acid).
  • alkene dicarboxylic acids having 4 to 36 carbon atoms include maleic acid, fumaric acid, citraconic acid, and mesaconic acid.
  • the number average molecular weight of the polyester resin is preferably within a range of 1,000 to 50,000, and more preferably within a range of 2,000 to 20,000.
  • the urethane resin is preferably an aqueous dispersion of a self-emulsifying urethane having water-soluble functional groups in its molecules, or an aqueous dispersion of a forced-emulsifying urethane emulsified under strong mechanical shearing force in combination with a surfactant.
  • the urethane resin in the aqueous dispersion can be obtained by reacting a polyol with an organic polyisocyanate and a hydrophilic group-containing compound.
  • Polyols that can be used to prepare the aqueous dispersion of the urethane resin include, for example, polyester polyols, polyether polyols, polycarbonate polyols, and polyolefin polyols.
  • polyester polyols include condensates of low molecular weight polyols and polycarboxylic acids.
  • low molecular weight polyols examples include ethylene glycol, diethylene glycol, triethylene glycol, 1,2- and 1,3-propylene glycol, neopentyl glycol, 1,3- and 1,4-butanediol, 3-methylpentanediol, hexamethylene glycol, 1,8-octanediol, 2-methyl-1,3-propanediol, bisphenol A, hydrogenated bisphenol A, trimethylolpropane, and cyclohexanedimethanol.
  • polyether polyols examples include polyethylene glycol, polypropylene glycol, polyethylene polytetramethylene glycol, polypropylene polytetramethylene glycol, and polytetramethylene glycol.
  • Polycarbonate polyols can be obtained by reacting a carbonic acid derivative, such as diphenyl carbonate, dimethyl carbonate, or phosgene, with a diol.
  • a carbonic acid derivative such as diphenyl carbonate, dimethyl carbonate, or phosgene
  • diol examples include ethylene glycol, diethylene glycol, triethylene glycol, 1,2- and 1,3-propylene glycol, neopentyl glycol, 1,3- and 1,4-butanediol, 3-methylpentanediol, hexamethylene glycol, 1,8-octanediol, 2-methyl-1,3-propanediol, bisphenol A, hydrogenated bisphenol A, trimethylolpropane, and cyclohexanedimethanol.
  • Aromatic isocyanates include, for example, tolylene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), polymeric MDI, xylylene diisocyanate (XDI), tetramethylxylylene diisocyanate (TMXDI), etc.
  • aliphatic isocyanates examples include hexamethylene diisocyanate (HMDI).
  • acrylates examples include 2-hydroxybutyl (meth)acrylate, benzyl (meth)acrylate, glycidyl (meth)acrylate, (meth)acrylic acid, (di)ethylene glycol di(meth)acrylate, 1,4-butanediol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, trimethylolpropane tri(meth)acrylate, glycerin di(meth)acrylate, 2-ethylhexyl (meth)acrylate, lauryl (meth)acrylate, stearyl (meth)acrylate, and acrylamide.
  • the number average molecular weight (Mn) of the acrylic resin is preferably within the range of 1,000 to 50,000, and more preferably within the range of 2,000 to 20,000.
  • the coating film When the number average molecular weight (Mn) of the acrylic resin is 1,000 or more, the coating film has strong cohesive strength and improves adhesion, and when it is 50,000 or less, it has good solubility in organic solvents, which promotes the miniaturization of the particle size of the emulsion dispersion.
  • Mn number average molecular weight
  • the composite resin particles that can be contained in the ink are preferably composite resin particles in which an acrylic resin is emulsified in a urethane resin, that is, composite resin particles having an inner layer made of an acrylic resin and a surface layer made of a urethane resin.
  • the aforementioned urethane resin exists at the interface between the acrylic resin as the water-insoluble resin particles and the water as the continuous phase, and functions as a water-insoluble resin particle layer that is different from the resin that protects the water-insoluble resin particles.
  • the mass ratio (U/A) between the urethane resin (U) and the acrylic resin (A) is preferably 40/60 to 95/5.
  • the proportion of the urethane resin (U) is within the above range, compatibility with the dispersant is improved, and solvent resistance is also improved.
  • the proportion of the acrylic resin (A) is within the above range, adhesion to acrylic films is excellent.
  • the mass ratio (U/A) between the urethane resin (U) and the acrylic resin (A) is preferably 40/60 to 80/20.
  • the treatment liquid according to the present invention contains at least an aggregating agent, and by aggregating or thickening the ink when an image is recorded on a substrate by inkjet printing, can have the functions of accelerating ink image formation, improving the physical properties of the treatment liquid layer and the ink layer, and improving image quality.
  • the treatment liquid according to the present invention may contain other components such as a flocculant, a water-soluble solvent, a surfactant, and water, as appropriate, to the extent that the effect of the present invention is not impaired.
  • the treatment liquid according to the present invention contains a material that generates aggregates when it comes into contact with ink, that is, an aggregating agent which is a polyvalent metal salt.
  • the aggregating agent enhances the interaction with the ink, and can more firmly fix the ink dots.
  • the type of salt constituting the polyvalent metal salt is not particularly limited, but known salts such as carbonates, sulfates, nitrates, hydrochlorides, organic carboxylates, organic sulfonates, borates, phosphates, hydrobromides, hydroiodides, and thiocyanates can be used.
  • the content of the organic acid is preferably within the range of 0.1 to 10 mass %, and more preferably within the range of 1 to 3 mass %, relative to the total mass of the treatment liquid (100 mass %).
  • the inorganic acid is capable of agglomerating pigments that may be contained in the ink, which will be described later.
  • examples of the inorganic acid include hydrochloric acid, nitric acid, sulfuric acid, and sulfamic acid.
  • a soluble cationic polymer may be used as the flocculant.
  • the soluble cationic polymer include polyallylamine, polyvinylamine, polyethyleneimine, and polydiallyldimethylammonium chloride.
  • water-soluble solvent having an SP value of 24 (J/cm 3 ) 1/2 or more and a boiling point of 150° C. to 250° C. examples include polyhydric alcohols having 2 to 8 carbon atoms and polyalkylene glycols.
  • Polyhydric alcohols with 2 to 8 carbon atoms include 1,2-ethanediol (SP value: 30.3, boiling point: 197°C), 1,2-propanediol (SP value: 28.0, boiling point: 188°C), 1,3-propanediol (SP value: 32.9, boiling point: 213°C), 1,2-butanediol (SP value: 26.1, boiling point: 192°C), 1,3-butanediol (SP value: 30.3, boiling point: 207°C), 1,4-butanediol (SP value: 30.7, boiling point: 230°C), and 2,3-butanediol (SP value: 29.9, boiling point: 177°C), 2-methyl-1,3-propanediol (SP value: 30.3, boiling point: 214°C), 1,2-pentanediol (SP value: 25.0, boiling point: 210°C), 1,5-pentanediol (SP value
  • the ink may contain at least one water-soluble solvent having a boiling point in the range of 150 to 250°C, and may also contain alcohols other than those mentioned above, polyhydric alcohols, amines, amides, glycol ethers, and 1,2-alkanediols with 4 or more carbon atoms.
  • the total content of the water-soluble solvent is preferably within the range of 5 to 40% by mass, and more preferably within the range of 10 to 40% by mass, relative to 100% by mass of the total mass of the treatment liquid.
  • not overlapping two or more colors of ink leads to a reduction in the amount of ink applied when forming an image. Also, for example, when forming an image on a recording medium, if you want to express green as the color of the image, you would normally overlap yellow ink and cyan ink on the recording medium to express green.
  • non-absorbent recording substrate refers to a recording substrate (medium) that has a water absorption amount of 10 mL/m2 or less from the start of contact to 30 msec in the Bristow method.
  • a known plastic film can be used as the non-absorbent substrate.
  • plastic films include polyester films such as polyethylene terephthalate, polyethylene films, polypropylene films, polyamide films such as nylon, polystyrene films, polyvinyl chloride films, polycarbonate films, polyacrylonitrile films, polylactic acid films, and other biodegradable films.
  • the film in order to impart gas barrier properties, moisture resistance, aroma retention, etc., it is preferable to coat one or both sides of the film with polyvinylidene chloride.
  • films with metal oxides vapor-deposited thereon can also be preferably used.
  • non-absorbent films both unstretched and stretched films can be preferably used.
  • ink application process it is preferable to apply ink to the area to which the treatment liquid has been applied when the drying rate of the treatment liquid is 30% or less. It is also preferable to carry out the ink application process within 10 seconds after the treatment liquid application process. In particular, it is preferable to carry out the ink application process within 0.1 to 5 seconds after the treatment liquid application process when the drying rate of the treatment liquid is within the range of 1 to 10%.
  • the amount of ink droplets so that the amount of ink applied (also called the "application amount") per unit area is within the range of 2 to 25 times the amount of treatment liquid applied, in order to achieve higher image quality, and a more preferable range for the application amount is within the range of 2.5 to 3.5 times.
  • the inkjet method is not particularly limited, and a printer equipped with an inkjet head loaded with ink can be used. Specifically, ink is ejected as droplets from the nozzles of the inkjet head based on a digital signal, and these are then deposited on the treatment liquid layer of the substrate to perform printing.
  • the inkjet head may be either an on-demand type or a continuous type.
  • On-demand type inkjet heads include electro-mechanical conversion type heads, including single cavity type, double cavity type, bender type, piston type, shear mode type, and shared wall type.
  • Other examples include electro-thermal conversion type heads, including thermal inkjet type and bubble jet type heads ("Bubble Jet” is a registered trademark of Canon Inc.).
  • an inkjet head that uses a piezoelectric element as the electromechanical conversion element used in the electromechanical conversion method (also called a piezo-type inkjet head).
  • the solvent components of the treatment liquid and ink such as water and water-soluble solvents, are removed.
  • the polyvalent metal salt is dried at a temperature above its thermal decomposition temperature, particularly in the case of metal substrates, and thermally decomposed. This also improves the abrasion resistance of the image and its adhesion to the substrate.
  • the thickness of the image layer obtained in the above manner is preferably within the range of 0.3 to 3.0 ⁇ m, and more preferably within the range of 0.3 to 2.0 ⁇ m.
  • the thickness of the image layer is 0.3 ⁇ m or more, the adhesion and abrasion resistance of the image are easily improved.
  • the thickness of the image layer is 3.0 ⁇ m or less, the deformation stress applied to the image layer can be reduced, so the adhesion of the image layer is less likely to be impaired.
  • Inkjet recording device As a recording device that can be used in the present invention, a method of printing ink containing two or more pigment dispersions and a treatment liquid in advance using a normal inkjet printing device can be used. In addition, a means of mixing pigment dispersions in which the absolute value of the difference in aggregation index GX between all pigment dispersions is 0.4 or less in any ratio in a flow path and recording can be used. In this way, pigment dispersions with the same degree of aggregation can be efficiently mixed to form an image with a wide color gamut and no color bleeding.
  • the means for mixing the pigment dispersions in a given ratio within the flow path for recording can be, for example, a recording device equipped with a mixer.
  • Figure 4 shows an example of a mixer that mixes the components that make up the ink set. Below, the components of the mixer that mixes the components that make up the ink set of the present invention are listed using Figure 4.
  • Pigment dispersion Y1 was diluted 15,000 times with pure water, and the absorption spectrum was measured using a spectrophotometer (V-1550 manufactured by JASCO Corporation) to calculate the maximum absorption maximum wavelength, which was 411 nm.
  • the average particle diameter D50 of the pigment particles contained in this pigment dispersion was measured using a multiple sample nanoparticle diameter measurement system "nanoSAQLA” manufactured by Otsuka Electronics Co., Ltd., and was found to be 155 nm.
  • Example 2 [2-1] Preparation of Ink 1 The following material [2] was added in the amounts shown below with stirring, and the resulting mixture was filtered through a 1 ⁇ m filter to prepare Ink 1. Note that no substantial change in composition was observed in Ink 1 before and after filtration through the filter.
  • ⁇ B ⁇ C means the absolute value of the maximum absorption maximum wavelength of a pigment dispersion classified into pigment dispersion class B minus the maximum absorption maximum wavelength of a pigment dispersion classified into pigment dispersion class C.
  • D 50C-50A means the absolute value of the average particle diameter D 50A of a pigment dispersion classified into pigment dispersion class A from the average particle diameter D 50C of a pigment dispersion classified into pigment dispersion class C.
  • Example 3 [3-1] Preparation of treatment liquid 1
  • the following materials [3] were added in the amounts shown below with stirring, and the resulting mixture was filtered through a 1 ⁇ m filter to prepare treatment liquid 1.
  • a single-pass printer (see Figure 6) equipped with two independently driven inkjet heads manufactured by Konica Minolta (360 npi, ejection volume of 6 pL, 14 pL, or 28 pL, 1024 nozzles) was prepared.
  • the head H PL which was to be recorded first was filled with each treatment liquid, and the head H ink which was to be recorded later was filled with each ink.
  • the carriage transport speed was set to 300 mm/sec, and there was no drying process between the time when the treatment liquid was ejected onto the recording medium and the time when the ink was ejected and printed.
  • the printed recording medium was placed in a dryer set at 90°C and heated and dried for 5 minutes to produce an image record.
  • AA The thin lines are printed in a thin, straight line.
  • A Thin lines are bulging in places and printed slightly distorted.
  • B Lines are significantly blurred and distorted, or color bleeding is observed.
  • the absorbance derived from one of the pigment dispersions is subtracted as a base, which will be specifically described below.
  • the value obtained by subtracting the absorbance of the pigment dispersion C1 from the absorbance of the aqueous pigment ink is read as the absorbance B bef at the maximum absorption maximum wavelength derived from the class B of the pigment dispersion.
  • the absorbance of the aqueous pigment ink minus the absorbance of Pigment Dispersion Y1 is similarly read as the absorbance A bef at the maximum absorption maximum wavelength derived from Class A of the pigment dispersion.
  • the absorbance was read for the set of pigment dispersions having the closest maximum absorption maximum wavelength in ink 15. That is, the absorbance B bef at the maximum absorption maximum wavelength derived from pigment dispersion class B and the absorbance C bef at the maximum absorption maximum wavelength derived from pigment dispersion class C were read.
  • each prepared ink and 0.5 g of 5-fold diluted treatment liquid were mixed in a sample tube to prepare a 1:1 mixture of ink and 5-fold diluted treatment liquid.
  • the combinations of each ink and the treatment liquid used to prepare the 5-fold diluted treatment liquid were those of ink sets 1 to 45 listed in Tables VIII and IX.
  • the absorbance A aft at the maximum absorption maximum wavelength derived from the pigment dispersion class A and the absorbance B aft at the maximum absorption maximum wavelength derived from the pigment dispersion class B were read.
  • the absorbance B aft when reading the absorbance B aft at the maximum absorption maximum wavelength derived from the pigment dispersion of class B in the supernatant after centrifuging a 1:1 mixture of an ink and a 5-fold diluted treatment liquid, the absorbance derived from one of the pigment dispersions is subtracted as a base.
  • the absorbance derived from one of the pigment dispersions is subtracted as a base.
  • ink set 1 the combination of ink and treatment liquid is ink 1 and treatment liquid 1.
  • a mixed liquid of pigment dispersion Y1 of pigment dispersion class A and a treatment liquid will be simply referred to as “mixed liquid AY1.”
  • a mixed liquid of pigment dispersion C1 of pigment dispersion class B and a treatment liquid will be simply referred to as “mixed liquid BC1.”
  • the value obtained by subtracting the absorbance of mixed liquid BC1 from the absorbance of the mixed liquid of ink 1 and a 5-fold diluted aqueous solution of treatment liquid 1 is read as the absorbance B aft at the maximum absorption maximum wavelength derived from class B of the pigment dispersion.
  • Tables VIII and IX show the aggregation index G A derived from pigment dispersion class A, the aggregation index G B derived from pigment dispersion class B, and the aggregation index G C derived from pigment dispersion class C for ink sets 1 to 45. Also shown are the absolute values of the differences in the aggregation indexes.
  • Example 5 Method of Producing Image Recorded Material
  • a two-color printing test was carried out in the following manner.
  • the two-color ink set is composed of an ⁇ ink, a ⁇ ink, and a treatment liquid.
  • Table X lists two types of ink, ⁇ ink and ⁇ ink, but this is merely for convenience, to simplify and describe each parameter in each ink classification.
  • the abbreviations in Table X are as follows:
  • the recording of the treatment liquid was set to a liquid volume of 6 pL and a print rate of 30%, while the recording of the ink was set to a liquid volume of 28 pL and a print rate of 100%.
  • a single-pass printer (see Figure 8) equipped with one independently driven inkjet head manufactured by Konica Minolta (360 npi, ejection volume of 6 pL, 14 pL, or 28 pL, 1024 nozzles) was prepared.
  • Ink sets were prepared by combining ⁇ ink, ⁇ ink, and treatment liquid 1. The combinations are shown in Tables XII and XIII. Printing tests were carried out using the ink sets with the combinations shown in Tables XII and XIII in the following manner.
  • a head H ink in FIG. 6 is a recording head 113 of a recording device equipped with a mixing device, and a liquid sending flow path 112 is connected to the recording head 113 (see FIG. 5).

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inks, Pencil-Leads, Or Crayons (AREA)

Abstract

Un problème abordé par la présente invention consiste à fournir un ensemble encres et un procédé d'enregistrement à jet d'encre permettant de supprimer le coulage de couleur et d'obtenir une large gamme de couleurs. L'invention concerne également un dispositif d'enregistrement capable de réduire la charge de séchage tout en maintenant une qualité élevée.　Dans un ensemble encres composé d'un liquide de traitement et d'une encre pigmentaire aqueuse contenant au moins deux dispersions X de pigment, l'encre pigmentaire aqueuse contient au moins deux dispersions X de pigment ou plus contenant une dispersion A de pigment a et une dispersion B de pigment. La valeur absolue de la différence entre les longueurs d'onde d'absorption maximales de la dispersion A de pigment et de la dispersion B de pigment est de 50 nm ou plus, et l'agrégabilité de toutes les dispersions de pigment contenues dans le mélange du liquide de traitement et de l'encre pigmentaire aqueuse et l'agrégabilité de toutes les dispersions de pigment elles-mêmes sont définies dans des plages spécifiques.
PCT/JP2024/043930 2024-01-15 2024-12-12 Ensemble encres, procédé d'impression à jet d'encre et dispositif d'enregistrement Pending WO2025154438A1 (fr)

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JP2024-003835 2024-01-15

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Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000246920A (ja) * 1998-12-28 2000-09-12 Fuji Photo Film Co Ltd 画像形成方法、装置および記録ヘッド
JP2000289226A (ja) * 1999-04-09 2000-10-17 Canon Inc インクジェット記録装置
JP2001088279A (ja) * 1999-09-20 2001-04-03 Fuji Photo Film Co Ltd 画像形成方法および装置
JP2004107453A (ja) * 2002-09-17 2004-04-08 Canon Inc インクセット、インクジェット記録方法及び記録物
WO2017013984A1 (fr) * 2015-07-22 2017-01-26 コニカミノルタ株式会社 Agent de prérevêtement pour jet d'encre et procédé de formation d'image utilisant celui-ci
WO2017122818A1 (fr) * 2016-01-15 2017-07-20 東洋インキＳｃホールディングス株式会社 Solution de pré-traitement, ensemble encre et procédé de production de matière imprimée
WO2017212848A1 (fr) * 2016-06-07 2017-12-14 コニカミノルタ株式会社 Procédé d'enregistrement à jet d'encre
JP2018114751A (ja) * 2017-01-16 2018-07-26 東洋インキＳｃホールディングス株式会社 前処理液、インキセット、及び印刷物の製造方法
JP2019006855A (ja) * 2017-06-21 2019-01-17 コニカミノルタ株式会社 記録液セット、画像形成方法、および積層体
WO2022186280A1 (fr) * 2021-03-03 2022-09-09 株式会社Ｄｎｐファインケミカル Jeu d'encres
JP2023087706A (ja) * 2021-12-14 2023-06-26 コニカミノルタ株式会社 インクセット及び画像形成方法
JP2023087720A (ja) * 2021-12-14 2023-06-26 コニカミノルタ株式会社 プレコート液、インクセット、インクジェット記録方法及びインクジェット記録システム

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000246920A (ja) * 1998-12-28 2000-09-12 Fuji Photo Film Co Ltd 画像形成方法、装置および記録ヘッド
JP2000289226A (ja) * 1999-04-09 2000-10-17 Canon Inc インクジェット記録装置
JP2001088279A (ja) * 1999-09-20 2001-04-03 Fuji Photo Film Co Ltd 画像形成方法および装置
JP2004107453A (ja) * 2002-09-17 2004-04-08 Canon Inc インクセット、インクジェット記録方法及び記録物
WO2017013984A1 (fr) * 2015-07-22 2017-01-26 コニカミノルタ株式会社 Agent de prérevêtement pour jet d'encre et procédé de formation d'image utilisant celui-ci
WO2017122818A1 (fr) * 2016-01-15 2017-07-20 東洋インキＳｃホールディングス株式会社 Solution de pré-traitement, ensemble encre et procédé de production de matière imprimée
WO2017212848A1 (fr) * 2016-06-07 2017-12-14 コニカミノルタ株式会社 Procédé d'enregistrement à jet d'encre
JP2018114751A (ja) * 2017-01-16 2018-07-26 東洋インキＳｃホールディングス株式会社 前処理液、インキセット、及び印刷物の製造方法
JP2019006855A (ja) * 2017-06-21 2019-01-17 コニカミノルタ株式会社 記録液セット、画像形成方法、および積層体
WO2022186280A1 (fr) * 2021-03-03 2022-09-09 株式会社Ｄｎｐファインケミカル Jeu d'encres
JP2023087706A (ja) * 2021-12-14 2023-06-26 コニカミノルタ株式会社 インクセット及び画像形成方法
JP2023087720A (ja) * 2021-12-14 2023-06-26 コニカミノルタ株式会社 プレコート液、インクセット、インクジェット記録方法及びインクジェット記録システム

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