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WO2023127740A1 - Ensemble d'encres - Google Patents

Ensemble d'encres Download PDF

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Publication number
WO2023127740A1
WO2023127740A1 PCT/JP2022/047689 JP2022047689W WO2023127740A1 WO 2023127740 A1 WO2023127740 A1 WO 2023127740A1 JP 2022047689 W JP2022047689 W JP 2022047689W WO 2023127740 A1 WO2023127740 A1 WO 2023127740A1
Authority
WO
WIPO (PCT)
Prior art keywords
maintenance liquid
organic solvent
ether
ink composition
ink set
Prior art date
Application number
PCT/JP2022/047689
Other languages
English (en)
Japanese (ja)
Inventor
真一 吉満
良平 岡
光矢 新里
Original Assignee
株式会社Ｄｎｐファインケミカル
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 株式会社Ｄｎｐファインケミカル filed Critical 株式会社Ｄｎｐファインケミカル
Priority to JP2023570973A priority Critical patent/JPWO2023127740A1/ja
Publication of WO2023127740A1 publication Critical patent/WO2023127740A1/fr

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
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/135—Nozzles
    • B41J2/165—Prevention or detection of nozzle clogging, e.g. cleaning, capping or moistening for nozzles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00—Inking and printing with a printer's forme
    • B41M1/26—Printing on other surfaces than ordinary paper
    • B41M1/30—Printing on other surfaces than ordinary paper on organic plastics, horn or similar materials
    • 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
    • C09D11/36—Inkjet printing inks based on non-aqueous solvents
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D11/00—Inks
    • C09D11/54—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
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
    • C11D7/22—Organic compounds
    • C11D7/26—Organic compounds containing oxygen
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
    • C11D7/50—Solvents

Definitions

  • the present invention relates to an ink set containing an ink composition and a maintenance liquid.
  • an aqueous ink composition in which a coloring material is dissolved or dispersed in water or a mixture of water and an organic solvent, or a non-aqueous ink composition in which a coloring material is dissolved or dispersed in an organic solvent that does not contain water.
  • Ink compositions are widely used.
  • a maintenance liquid is known that is circulated in an ink flow path for circulating an ink composition in an inkjet recording apparatus.
  • the components derived from the ink composition are solid components including colorant components and resins contained in the ink composition ejected by the inkjet recording apparatus, metal compounds derived from metals contained as impurities, and the like.
  • the component derived from the device member is a precipitate or the like of the device member generated by dissolving only a small part of the device member with the ink composition.
  • Patent Literature 1 describes a technique related to a maintenance liquid for an inkjet recording apparatus containing two or more kinds of predetermined glycol derivative compounds. Patent Literature 1 describes that this maintenance liquid is excellent in dryness and moisture retention.
  • Patent Document 2 describes a technique related to a solvent-based maintenance liquid containing a lactone-based solvent and a predetermined amount of an alkylene glycol monoether-based solvent. Patent Document 1 describes that this maintenance liquid can reduce attack on members.
  • the maintenance liquid will volatilize in the ink flow path, and components derived from the ink composition adhering to the inside of the ink flow path, etc. will be removed. can no longer be removed.
  • An object of the present invention is to provide an ink set containing a maintenance liquid with excellent moisturizing and cleansing properties.
  • the organic solvent contained in the liquid contains a lactone solvent and an organic solvent A having a boiling point of 240° C. or more and 310° C. or less
  • the non-aqueous ink composition contains an organic solvent, a resin, and a coloring material.
  • the organic solvent contained in the non-aqueous ink composition contains an alkylene glycol dialkyl ether, a lactone solvent, and an organic solvent B having a boiling point of 240° C. or more and 310° C. or less.
  • the maintenance liquid further contains an alkylene glycol dialkyl ether, and the content of the organic solvent contained in the maintenance liquid satisfies formula (I) and is contained in the non-aqueous ink composition.
  • the lactone-based solvent contained in the maintenance liquid is at least one selected from the group consisting of ⁇ -butyrolactone, ⁇ -valerolactone, ⁇ -valerolactone, ⁇ -hexanolactone, and ⁇ -caprolactone.
  • the organic solvent A contained in the maintenance liquid is an organic solvent having a boiling point of 280° C. or less, and the content of the organic solvent A is in the range of 10% by mass or more and 30% by mass or less in the total amount of the maintenance liquid.
  • a maintenance method for an inkjet recording apparatus in which the maintenance included in the ink set according to any one of (1) to (7) is used to perform maintenance of the inkjet recording apparatus.
  • the ink set of the present invention has excellent moisturizing and cleansing properties.
  • the ink set according to the present embodiment is an ink set of a non-aqueous ink composition that is inkjet-ejected by an inkjet recording apparatus and a maintenance liquid that is used in the inkjet recording apparatus.
  • the maintenance liquid and the non-aqueous ink composition included in the ink set according to the present embodiment will be described below.
  • the maintenance liquid contained in the ink set according to the present embodiment is maintenance liquid used in an inkjet recording apparatus.
  • the term "maintenance liquid used in an inkjet recording apparatus" refers to a maintenance liquid used to remove components derived from an ink composition adhering to members such as an ink flow path or an inkjet head in an inkjet recording apparatus. means that
  • the maintenance liquid is characterized by containing an organic solvent containing a lactone-based solvent and an organic solvent A having a boiling point of 240°C or higher and 310°C or lower.
  • the maintenance liquid containing the organic solvent A with a boiling point of 240°C or higher and 310°C or lower can improve the moisturizing property of the maintenance liquid.
  • the non-aqueous ink composition contained in the ink set contains a lactone solvent and an organic solvent B having a boiling point of 240° C. or higher and 310° C. or lower, similarly to the maintenance liquid. Common with organic solvents. With such a maintenance liquid, it is possible to disperse and dissolve the components derived from the non-aqueous ink composition adhering to the member.
  • the maintenance liquid and the non-aqueous ink composition contained in the ink set according to the present embodiment may contain a lactone solvent and an organic solvent having a boiling point of 240° C. or more and 310° C. or less.
  • a lactone solvent and an organic solvent having a boiling point of 240° C. or more and 310° C. or less may be contained, the components derived from the non-aqueous ink composition adhered to the member can be removed from the maintenance liquid by using the same type of organic solvent contained in the maintenance liquid and the non-aqueous ink composition. It becomes possible to disperse and dissolve more effectively.
  • the maintenance liquid further contains an alkylene glycol dialkyl ether, and the content of the organic solvent contained in the non-maintenance liquid is in the relationship of formula (I), and the organic solvent contained in the non-aqueous ink composition described later.
  • the content of the solvent preferably satisfies the relationship of formula (II).
  • the content of the organic solvent A With a boiling point of 240°C or higher and 310°C or lower in the maintenance liquid higher than the content of the lactone-based solvent, it is possible to improve the moisturizing properties of the maintenance liquid. Further, by making the content of the lactone solvent in the non-aqueous ink composition larger than the content of the organic solvent B at 240° C. or higher and 310° C. or lower, the permeability to the resin substrate is improved and the bleeding of the print is suppressed. can be reduced.
  • the organic solvent contained in the maintenance liquid and the organic solvent contained in the non-aqueous ink composition are common, the components derived from the non-aqueous ink composition adhering to the member are dispersed and dissolved by the maintenance liquid. It is possible to
  • the maintenance liquid preferably has a volatilization amount X of 900 g/L or less in the volatilization test described below.
  • volatilization amount X Wv x p x 0.01 (A) (In the formula, Wv is the mass fraction (unit: mass %) of the organic solvent contained in the maintenance liquid, and p is the specific gravity (unit: g/L) of the maintenance liquid.
  • a plate with a diameter of 5 cm and a height of 1 cm 2g of the maintenance liquid was weighed out precisely, placed in an oven heated to 105°C, and dried for 4 hours.After taking it out, it was allowed to cool in a desiccator for 30 minutes, then weighed accurately and the amount of volatilization of the organic solvent Wv (mass% ) is calculated.)
  • the maintenance liquid having a volatilization amount X of 900 g/L or less can further improve the moisturizing properties of the maintenance liquid. Furthermore, since volatilization of the maintenance liquid can be suppressed in the ink flow path, cleaning performance of the maintenance liquid can be further improved.
  • the maintenance liquid has a volatilization amount X of 900 g/L or less, it is possible to reduce the generation of suspended particulate matter (VOC), thereby suppressing air pollution.
  • VOC suspended particulate matter
  • the volatilization amount X of the maintenance liquid may be 900 g/L or less, but the upper limit of the volatilization amount X of the maintenance liquid is preferably 897 g/L or less, more preferably 895 g/L or less.
  • the lower limit of the volatilization amount X of the maintenance liquid is not particularly limited, but the lower limit of the volatilization amount X of the maintenance liquid is preferably 500 g/L or more, more preferably 700 g/L or more, and 800 g/L or more. is more preferable. This makes it possible to improve the drying property of the maintenance liquid.
  • Organic solvent has the function of cleaning clogged ink channels.
  • This organic solvent contains a lactone solvent and an organic solvent A having a boiling point of 240° C. or higher and 310° C. or lower.
  • Organic solvent A is an organic solvent having a boiling point of 190° C. or higher and 310° C. or lower. By containing the organic solvent A, it is possible to improve the moisturizing property of the maintenance liquid.
  • the boiling point of the organic solvent A is not particularly limited as long as it is 240° C. or higher and 310° C. or lower. ° C. or more is more preferable. As a result, the volatilization amount X of the entire maintenance liquid can be reduced, and the moisturizing property of the maintenance liquid can be improved more effectively.
  • the upper limit of the boiling point of the organic solvent A is preferably 305°C or lower, more preferably 300°C or lower. Thereby, the drying property of the maintenance liquid can be improved.
  • organic solvent A examples include triethylene glycol monobutyl ether, tetraethylene glycol monobutyl ether, and tetraethylene glycol monomethyl ether.
  • the content of the organic solvent A having a boiling point of 240° C. or more and 310° C. or less is not particularly limited, but the lower limit of the content of the organic solvent A is preferably 10% by mass or more, more preferably 13% by mass or more, based on the total amount of the maintenance liquid. and more preferably 15% by mass or more.
  • the volatilization amount X of the entire maintenance liquid can be reduced, and the moisturizing property of the maintenance liquid can be improved more effectively.
  • the upper limit of the content of the organic solvent A is preferably 30% by mass or less, preferably 27% by mass or less, and more preferably 25% by mass or less in the total amount of the maintenance liquid. Thereby, the drying property of the maintenance liquid can be improved.
  • a lactone solvent is a solvent having a cyclic ester structure. By containing the lactone-based solvent, the cleaning properties of the maintenance liquid can be improved.
  • lactone-based solvent for example, a lactone-based solvent having the following structure can be preferably used.
  • R6 is an alkylene group having 3 to 5 carbon atoms
  • R7 represents hydrogen or an alkyl group having 1 to 2 carbon atoms.
  • R 6 is preferably 3 or more and 4 or less, and more preferably 3. Containing such a lactone-based solvent can improve the washability of the maintenance liquid.
  • lactone solvents examples include ⁇ -butyrolactone, ⁇ -valerolactone, ⁇ -hexalactone, ⁇ -heptalactone, ⁇ -octalactone, ⁇ -nonalactone, ⁇ -decalactone, ⁇ -undecalactone, ⁇ -valero Lactone solvents such as lactone, ⁇ -hexanolactone, ⁇ -caprolactone, ⁇ -valerolactone, ⁇ -hexalactone, ⁇ -heptalactone, ⁇ -octalactone, ⁇ -nonalactone, ⁇ -decalactone, ⁇ -undecalactone mentioned.
  • those containing at least one selected from the group consisting of ⁇ -butyrolactone, ⁇ -valerolactone, ⁇ -valerolactone, ⁇ -hexanolactone, and ⁇ -caprolactone are preferred.
  • the content of the lactone-based solvent is not particularly limited, but the lower limit of the content of the lactone-based solvent is preferably in the range of 1% by mass or more, more preferably 3% by mass or more, based on the total amount of the maintenance liquid. Preferably, it is more preferably in the range of 10% by mass or more. As a result, it is possible to more effectively improve the washability of the maintenance liquid.
  • the upper limit of the content of the lactone-based solvent is preferably 90% by mass or less, more preferably 60% by mass or less, further preferably 40% by mass or less, and 15% by mass or less in the total amount of the maintenance liquid. is even more preferable.
  • the maintenance liquid is highly suitable for members constituting the inkjet recording apparatus.
  • the organic solvent may contain an organic solvent other than the organic solvent A and the lactone solvent.
  • organic solvent other than the organic solvent A and the lactone solvent.
  • ketones or ketoalcohols such as diols, ethers such as tetrahydrofuran and dioxane, oxyethylene or oxypropylene copolymers such as polyethylene glycol and polypropylene glycol, ethylene glycol, propylene glycol, diethylene glycol, dipropylene glycol, 1,3-propanediol, isobutylene glycol , triethylene glycol, tripropylene glycol, tetraethylene glycol, 1,3-propanediol, 2-methyl-1,2-propanediol, 2-methyl-1,2-propanediol, 1,2-butanediol, 1 ,3-butanediol, 1,4-butanediol, 1,2-pentanediol, 1,2-hexanediol, 1,5-pentanediol, 1,6-hexanediol, 2-methyl-2,4-pentane Diol
  • organic solvents such as cyclic unsaturated hydrocarbons, aromatic hydrocarbons such as benzene, toluene, and xylene, morpholines such as N-methylmorpholine, N-ethylmorpholine, and N-formylmorpholine, and terpene solvents, organic solvent A and organic solvents that do not correspond to lactone solvents. It is preferable to select a solvent with an appropriate HLB value according to the resin, dispersant, etc. to be combined.
  • alkylene glycol dialkyl ether it is preferable to contain alkylene glycol dialkyl ether.
  • the organic solvent contained in the non-aqueous ink composition described later contains an alkylene glycol dialkyl ether, and as a result, the organic solvent contained in the maintenance liquid and the organic Since the component is more similar to the solvent, it is possible to more effectively disperse and dissolve the component derived from the non-aqueous ink composition attached to the member, and it is possible to further improve the cleaning performance. becomes.
  • the content of the other organic solvent is not particularly limited, but the lower limit of the content of the other organic solvent is preferably in the range of 10% by mass or more, more preferably 20% by mass or more in the total amount of the maintenance liquid. is more preferable, and the range of 30% by mass or more is even more preferable.
  • the upper limit of the content of other organic solvents is preferably 90% by mass or less, more preferably 85% by mass or less, and preferably 80% by mass or less, based on the total amount of the maintenance liquid. More preferred.
  • the maintenance liquid according to this embodiment may contain a coloring material. By containing the coloring material, it is possible to suppress the corrosion of the member by the organic solvent contained in the maintenance liquid, thereby improving the suitability of the member.
  • the coloring material is not particularly limited, and may be dye-based or pigment-based, but pigments are preferable from the viewpoint of dispersibility in the maintenance liquid.
  • Pigments that can be used in the maintenance liquid according to the present embodiment are not particularly limited, and examples thereof include organic pigments that are 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 maintenance liquid according to the present embodiment does not have to contain a coloring material.
  • the dispersion stability of the pigment can be improved by using a dispersant or a dispersing aid (pigment derivative), which will be described later.
  • 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
  • the average dispersed particle size of the pigment that can be contained is not particularly limited. Although it varies depending on the type of pigment used, the volume-average particle size is preferably 5 nm or more, and preferably 20 nm or more, in order to obtain good dispersibility and dispersion stability of the pigment and to obtain sufficient coloring power. is more preferable, and 30 nm or more is even more preferable.
  • the volume average particle size is preferably 300 nm or less, more preferably 200 nm or less, and even more preferably 150 nm or less. In the present embodiment, the volume average particle diameter of the pigment is the volume average particle diameter (D50 ).
  • volume-based cumulative 50% particle diameter means a particle diameter at which the cumulative volume calculated from the smaller diameter side becomes 50%.
  • volume-based cumulative 50% particle size (D50) may also be referred to as “volume average particle size D50” or “median (median) size”.
  • the content of the coloring material is not particularly limited, but the lower limit of the content of the coloring material is preferably in the range of 0.0005% by mass or more, and in the range of 0.001% by mass or more in the total amount of the maintenance liquid. is more preferable, and the range of 0.005% by mass or more is even more preferable.
  • the upper limit of the content of the coloring material is preferably 1.0% by mass or less, more preferably 0.5% by mass or less, and 0.3% by mass or less in the total amount of the maintenance liquid. is more preferable.
  • the maintenance liquid according to the present embodiment does not contain a coloring material. Since it is possible to reduce the possibility that the coloring material contained in the maintenance liquid precipitates as a solid content, it is possible to improve the washability of the maintenance liquid.
  • the maintenance liquid according to this embodiment may contain a dispersant. As a result, it is possible to effectively disperse the components derived from the ink composition, and it is possible to improve the washability of the maintenance liquid.
  • the maintenance liquid according to the present embodiment contains the organic solvent A, it has high suitability for members with respect to the cured resin and excellent cleaning properties. can be further enhanced.
  • a polymer dispersant may be used as the dispersant.
  • a dispersant has a main chain of polyester, polyacrylic, polyurethane, polyamine, polycaprolactone, etc., and has a polar group such as an amino group, a carboxyl group, a sulfone group, or a hydroxyl group as a side chain. is.
  • polyacrylic dispersants for example, Disperbyk-2000, 2001, 2008, 2009, 2010, 2020, 2020N, 2022, 2025, 2050, 2070, 2095, 2150, 2151, 2155, 2163, 2164, BYKJET-9130, 9131 , 9132, 9133, 9151 (manufactured by Vic Chemie), Efka PX4310, PX4320, PX4330, PA4401, 4402, PA4403, 4570, 7411, 7477, PX4700, PX4701 (manufactured by BASF), TREPLUS D-1200, D-1410 , D-1420, MD-1000 (manufactured by Otsuka Chemical Co., Ltd.), Floren DOPA-15BHFS, 17HF, 22, G-700, 900, NC-500, GW-1500 (manufactured by Kyoeisha Chemical Co., Ltd.), and the like are used.
  • Polycaprolactone-based dispersants include, for example, Ajisper PB821, PB822, PB881 (manufactured by Ajinomoto Fine-Techno Co., Ltd.), Hinoact KF-1000, T-6000, T-7000, T-8000, T-8000E, T-9050 ( Kawaken Fine Chemicals Co., Ltd.), Solsperse 20000, 24000, 32000, 32500, 32550, 32600, 33000, 33500, 34000, 35200, 36000, 37500, 39000, 71000, 76400, 76500, 86000, 880 00, J180, J200 (lubri Sol Co.), TEGO Dispers 652, 655, 685, 688, 690 (Evonik Japan Co.) and the like are used.
  • Preferred dispersants include BYKJET-9130, 9131, 9132, 9133, 9151, Efka PX4310, PX4320, PX4330, PX4700, PX4701, Solsperse 20000, 24000, 32000, 33000, 33500, 34000, 352 00, 39000, 71000, 76500, 86000, 88000, J180, J200, TEGO Dispers 655, 685, 688, 690, etc. are used. These individual or mixtures thereof can be used.
  • the content of the dispersant is not particularly limited, but the lower limit of the content of the dispersant is preferably in the range of 0.0001% by mass or more, and in the range of 0.0005% by mass or more in the total amount of the maintenance liquid. is more preferable, and the range of 0.001% by mass or more is even more preferable.
  • the upper limit of the content of the dispersant is preferably 3.0% by mass or less, more preferably 1.0% by mass or less, and 0.5% by mass or less in the total amount of the maintenance liquid. is more preferable.
  • a dispersing aid may be used as necessary in the maintenance liquid according to the present embodiment.
  • the dispersing aid adheres to the surface of the coloring material (pigment), and the functional group increases the affinity with the organic solvent and dispersant in the maintenance liquid, improving the dispersion stability.
  • As the dispersing aid a known pigment derivative having a functional group such as an acidic group, a basic group, or a neutral group in the organic pigment residue can be used.
  • the maintenance liquid is used for the purpose of suppressing volatilization and solidification of the maintenance liquid in the device such as the nozzle part and the inside of the tube, and also for the purpose of resolubility when it solidifies, and also to reduce the surface tension.
  • a surfactant may be added for the purpose of improving washing performance.
  • acetylene glycol-based surfactants include Surfynol (registered trademark) 82, 104, 465, 485, TG (all manufactured by Air Products Japan), Olfine (registered trademark) STG, E1010 ( Nissin Kagaku Co., Ltd.) and the like are exemplified. Note that the maintenance liquid according to the present embodiment does not have to contain a surfactant.
  • the surfactant is not limited to the above, and any anionic, cationic, amphoteric or nonionic surfactant can be used, and may be appropriately selected according to the purpose of addition.
  • the maintenance liquid according to the present embodiment includes light stabilizers such as antioxidants and ultraviolet absorbers, epoxides and the like, polyvalent carboxylic acids, surface conditioners, slip agents, leveling agents (acrylic, silicone, etc.), Known additives such as antifoaming agents, pH adjusters, bactericides, preservatives, deodorants, charge control agents, wetting agents, pigments and extenders may be included as optional components.
  • light stabilizers such as antioxidants and ultraviolet absorbers, epoxides and the like, polyvalent carboxylic acids, surface conditioners, slip agents, leveling agents (acrylic, silicone, etc.)
  • Known additives such as antifoaming agents, pH adjusters, bactericides, preservatives, deodorants, charge control agents, wetting agents, pigments and extenders may be included as optional components.
  • the maintenance liquid according to the present embodiment is preferably a non-aqueous maintenance liquid having a moisture content of 5% by mass or less in the total amount of the maintenance liquid. With such a maintenance liquid, the maintenance liquid has excellent cleaning properties.
  • the organic solvent in advance when manufacturing the maintenance liquid.
  • the amount of water contained in the maintenance liquid can be reduced.
  • the glycol ether monoalkyl having an —OH group is highly water absorbent and absorbs moisture in the air, so it is particularly preferable to dry the glycol ether monoalkyl in advance.
  • a method for drying the organic solvent for example, a method of spraying an inert gas (e.g., nitrogen gas) dried in an inert gas atmosphere such as nitrogen for a predetermined time, a method of distilling and refining the organic solvent, and water are selected.
  • an inert gas e.g., nitrogen gas
  • Examples include a method of allowing the organic solvent to permeate through a semi-permeable membrane that selectively permeates the organic solvent, and a method of selectively adsorbing water mixed in the organic solvent with a water adsorbent that adsorbs water.
  • the non-aqueous ink composition included in the ink set according to this embodiment contains an alkylene glycol dialkyl ether, a lactone solvent, and an organic solvent B having a boiling point of 240° C. or more and 310° C. or less.
  • the maintenance liquid contains a lactone solvent and an organic solvent A.
  • the maintenance liquid contains a lactone solvent and an organic solvent having a boiling point of 240° C. or more and 310° C. or less. Since it is possible to disperse and dissolve the components derived from the non-aqueous ink composition, the washability of the maintenance liquid can be improved.
  • non-aqueous ink composition refers to an ink composition containing an organic solvent produced without intentionally containing water, unlike an aqueous ink composition containing water as a main component.
  • the ink composition has a moisture content of 5% by mass or less based on the total amount of the non-aqueous ink composition.
  • the water content is preferably 3% by mass or less, more preferably 1% by mass or less, based on the total amount of the non-aqueous ink composition.
  • the same organic solvent A contained in the above maintenance liquid can be used.
  • the boiling point of the organic solvent B is not particularly limited as long as it is 240° C. or higher and 310° C. or lower. °C or more is more preferable.
  • the upper limit of the boiling point of the organic solvent B is preferably 305°C or lower, more preferably 300°C or lower.
  • organic solvent B examples include triethylene glycol monobutyl ether, tetraethylene glycol monobutyl ether, and tetraethylene glycol monomethyl ether.
  • the content of the organic solvent B having a boiling point of 240° C. or more and 310° C. or less is not particularly limited, but the lower limit of the content of the organic solvent A is preferably 10% by mass or more in the total amount of the non-aqueous ink composition. It is more preferably at least 15% by mass, even more preferably at least 15% by mass.
  • the upper limit of the content of the organic solvent B is preferably 30% by mass or less, preferably 27% by mass or less, and more preferably 25% by mass or less in the total amount of the non-aqueous ink composition.
  • the same lactone-based solvent as the one contained in the above maintenance liquid can be used.
  • the content of the lactone-based solvent is not particularly limited, but the lower limit of the content of the lactone-based solvent is not particularly limited, but the lower limit of the content of the lactone-based solvent is 1% by mass or more of the total amount of the non-aqueous ink composition. It is preferably in the range, more preferably in the range of 3% by mass or more, and even more preferably in the range of 10% by mass or more.
  • the upper limit of the content of the lactone-based solvent is preferably 90% by mass or less, more preferably 60% by mass or less, and even more preferably 40% by mass or less, based on the total amount of the non-aqueous ink composition. % by mass or less is even more preferable.
  • Alkylene glycol dialkyl ether is a glycol ether-based solvent represented by the following formula (4).
  • R f (—OR g ) n —OR h (4)
  • R f and R h are each independently an optionally branched alkyl group having 1 to 8 carbon atoms
  • R g is an optionally branched alkyl group having 1 to 4 carbon atoms. represents a good alkylene group
  • n represents an integer of 1 or more and 6 or less.
  • Glycol ether dialkyl includes ethylene glycol dibutyl ether, ethylene glycol dipropyl ether, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, diethylene glycol methyl ethyl ether, diethylene glycol dipropyl ether, diethylene glycol propyl methyl ether, diethylene glycol dibutyl ether, diethylene glycol butyl methyl ether, diethylene glycol butyl.
  • diethylene glycol dimethyl ether diethylene glycol diethyl ether, diethylene glycol ethyl methyl ether, diethylene glycol dipropyl ether, diethylene glycol propyl methyl ether, diethylene glycol dibutyl ether, diethylene glycol butyl methyl ether, diethylene glycol butyl ethyl ether, diethylene glycol methyl-2-ethylhexyl ether, triethylene glycol Dimethyl ether, triethylene glycol diethyl ether, triethylene glycol ethyl methyl ether, tetraethylene glycol dimethyl ether, propylene glycol diethyl ether, propylene glycol ethyl methyl ether, propylene glycol methyl propyl ether, propylene glycol methyl butyl ether, propylene glycol methyl-2-ethylhexyl ether , dipropylene glycol dimethyl ether, dipropylene glycol dimethyl ether
  • the preferred content of the glycol ether dialkyl represented by formula (4) is preferably 40% by mass or more, more preferably 50% by mass or more, and 60% by mass or more in the total amount of the non-aqueous adhesive composition. is more preferable.
  • the preferred content of the glycol ether dialkyl represented by formula (4) is preferably 95% by mass or less, more preferably 90% by mass or less, and 85% by mass or less in the total amount of the non-aqueous adhesive composition. is more preferable.
  • the organic solvent may contain organic solvents other than the organic solvent B, the lactone solvent, and the glycol ether dialkyl. Specifically, ethylene glycol mono-n-butyl ether, ethylene glycol mono-isobutyl ether, ethylene glycol mono-t-butyl ether, ethylene glycol mono-2-ethylhexyl ether, diethylene glycol monomethyl (or ethyl, propyl, isopropyl, n-butyl , isobutyl, t-butyl, 2-ethylhexyl) ether, triethylene glycol monomethyl (or ethyl, propyl, isopropyl, n-butyl, isobutyl, t-butyl, 2-ethylhexyl) ether, tetraethylene glycol monomethyl ether, propylene glycol mono - n-butyl ether, propylene glycol mono-isobut
  • the content of the other organic solvent is not particularly limited, but the lower limit of the content of the other organic solvent is preferably in the range of 10% by mass or more, more preferably 20% by mass or more in the total amount of the maintenance liquid. is more preferable, and the range of 30% by mass or more is even more preferable.
  • the upper limit of the content of other organic solvents is preferably 90% by mass or less, more preferably 85% by mass or less, and preferably 80% by mass or less, based on the total amount of the maintenance liquid. More preferred.
  • the content of the organic solvent contained in the non-aqueous ink composition preferably satisfies the relationship of formula (II).
  • the permeability to the resin substrate is improved and the bleeding of the print is reduced. be able to.
  • the maintenance liquid described above satisfies the relationship of formula (I) (content of alkylene glycol dialkyl ether ⁇ content of lactone-based solvent>content of organic solvent B), the maintenance liquid has improved moisturizing properties and washability. It is possible to obtain the advantage of increasing the content of the lactone solvent more than the content of the organic solvent B at 240° C. or higher and 310° C. or lower while exhibiting the effect of the present invention that the temperature can be reduced.
  • the non-aqueous ink composition according to the present embodiment may contain no resin, but may contain a resin.
  • the term "resin” mainly means a binder resin that imparts abrasion resistance to the recording layer (recorded matter), and a dispersant (polymeric dispersant) containing a coloring material (pigment) described later. ) and polymeric surfactants such as surfactants having a siloxane skeleton.
  • the content of solids contained in the non-aqueous ink composition increases, so that part of the solids contained in the non-aqueous ink composition tends to precipitate.
  • the problems of the present invention such as an increase in the viscosity of the non-aqueous ink composition and deposition of solid content in the non-aqueous ink composition, occur more remarkably. If the maintenance liquid contains the organic solvent A, it is possible to effectively solve the problems of the present invention that become conspicuous by containing the resin.
  • resins include, but are not limited to, acrylic resins (including copolymers such as styrene-acrylic resins), polystyrene resins, polyester resins, vinyl chloride resins, vinyl acetate resins, Vinyl chloride vinyl acetate copolymer resin, polyethylene resin, polyurethane resin, rosin modified resin, phenol resin, terpene resin, polyamide resin, vinyl toluene- ⁇ -methylstyrene copolymer, ethylene-vinyl acetate copolymer Coalescing, cellulose-based resins, silicone (silicon) resins, acrylamide-based resins, epoxy-based resins, polyether-based resins, polycarbonate-based resins, or copolymer resins or mixtures thereof can be used.
  • acrylic resins, vinyl chloride-vinyl acetate copolymer resins, cellulose resins, polyester resins, and polyurethane resins are preferred.
  • the acrylic resin is not particularly limited as long as it is contained as a main component of the monomers that make up the (meth)acrylic acid ester monomer.
  • the acrylic resin may be a homopolymer of one radically polymerizable monomer, or may be a copolymer of two or more selected radically polymerizable monomers.
  • the acrylic resin preferable as the oil-based ink composition according to the embodiment is a homopolymer of methyl methacrylate, or at least one polymer selected from the group consisting of methyl methacrylate, butyl methacrylate, ethoxyethyl methacrylate, and benzyl methacrylate. It is a copolymer with one or more compounds. Examples of commercially available (meth)acrylic resins include "Paraloid B99N", "Paraloid B60", “Paraloid B66” and "Paraloid B82" manufactured by Rohm and Haas.
  • the vinyl chloride resin may be either a homopolymer composed of a vinyl chloride monomer or a copolymer using two or more selected polymerizable monomers.
  • copolymers of vinyl chloride resins include vinyl chloride-vinyl acetate copolymer resins.
  • a vinyl chloride-vinyl acetate copolymer resin is a polymer of vinyl chloride monomer and vinyl acetate monomer.
  • Vinyl chloride-vinyl acetate copolymer resins include, for example, vinyl chloride-vinyl acetate copolymer, vinyl chloride/vinyl acetate/maleic acid copolymer, vinyl chloride/vinyl acetate/vinyl alcohol copolymer, vinyl chloride/vinyl acetate / hydroxyalkyl acrylate copolymers, etc., and mixtures thereof.
  • the vinyl chloride-vinyl acetate copolymer resins include "SOLBIN C", “SOLBIN CL”, “SOLBIN CNL”, “SOLBIN CLL”, “SOLBIN CLL2", and "SOLBIN C5R" from Nissin Chemical Industry Co., Ltd. ”, “SOLBIN TA2”, “SOLBIN TA3”, “SOLBIN A”, “SOLBIN AL”, “SOLBIN TA5R”, “SOLBIN M5” and the like, and used in the present invention.
  • a vinyl chloride-vinyl acetate copolymer resin can be obtained by polymerizing a vinyl chloride monomer and a vinyl acetate monomer.
  • a conventionally known polymerization method may be used as the polymerization method.
  • the polymerization method is preferably emulsion polymerization or suspension polymerization, more preferably suspension polymerization.
  • a cellulose-based resin is a resin with a cellulose skeleton that is obtained by biologically or chemically introducing functional groups using cellulose as a raw material.
  • cellulose resins include cellulose acetate butyrate resin, cellulose acetate propionate resin, cellulose acetate alkylate resin such as cellulose acetate propionate butyrate resin, cellulose acetate resin, nitrocellulose resin, and mixtures thereof. mentioned.
  • examples of the above cellulose resins include "CAB551-0.01", “CAB551-0.2", “CAB553-0.4", "CAB531-1", “CAB381-0.1", “CAB381-0.5", and “CAB381” available from EASTMAN. -2", “CAB381-20", “CAP504", and "CAP482-0.5".
  • a polyester resin contains at least a structural unit obtained by polycondensation of an alcohol component and a carboxylic acid component.
  • the polyester-based resin may include a modified polyester-based resin.
  • Examples of the above polyester resin include "VYLON226", “VYLON270", “VYLON560”, “VYLON600”, “VYLON630”, “VYLON660”, “VYLON885", “VYLONGK250", “VYLONGK810", and “VYLON GK890” manufactured by Toyobo Co., Ltd. etc., and Unitika's product names such as “elitleUE-3200", “elitleUE-3285", “elitleUE-3320”, “elitleUE-9800” and “elitleUE-9885”.
  • a polyurethane resin contains at least a structural unit obtained by copolymerizing an alcohol component and an isocyanate component.
  • Polyurethane-based resins may include polyurethane-based resins modified with polyester, polyether, or caprolactone. Examples of the polyurethane-based resins include "Uriano KL-424", “Uriano KL-564", “Uriano KL-593", and “Uriano 3262” available from Arakawa Chemical Industries, Ltd., and "Pandex 372E” and "Uriano 372E” available from DIC.
  • acrylic resins, vinyl chloride-vinyl acetate copolymer resins, cellulose resins, polyester resins, and polyurethane resins may be used alone, but they may be used in combination. is preferable, and it is more preferable to use a resin obtained by mixing an acrylic resin and a vinyl chloride-vinyl acetate copolymer resin.
  • the content ratio of the acrylic resin and the vinyl chloride-vinyl acetate copolymer resin can be controlled so as to satisfy requirements such as color development, drying property, coating properties, and printability required for the ink composition.
  • the mixing ratio is not particularly limited and can be changed as appropriate.
  • the weight average molecular weight (relative molecular mass) of the resin is not particularly limited, it is preferably 5,000 or more, more preferably 15,000 or more.
  • the weight average molecular weight (relative molecular mass) is preferably 100,000 or less, more preferably 50,000 or less. Relative molecular weights of resins can be measured by conventional GPC (gel permeation chromatography).
  • the resin contained in the non-aqueous ink composition depends on other components contained in the ink composition, but is preferably contained in the range of 0.05% by mass or more based on the total amount of the ink composition, and 0.1% by mass. It is more preferably contained in the range of 0.5% by mass or more, more preferably in the range of 0.5% by mass or more.
  • the resin contained in the ink composition is preferably contained in the range of 20.0% by mass or less, more preferably 15.0% by mass or less, and 10.0% by mass of the total amount of the ink composition. % or less is more preferable.
  • the non-aqueous ink composition according to this embodiment contains a coloring material.
  • the coloring material the same coloring material as that contained in the above-described maintenance liquid can be used.
  • the preferred average dispersed particle diameter of the pigment is also the same as the preferred average dispersed particle diameter of the pigment contained in the maintenance liquid described above.
  • the content of the coloring material is not particularly limited as long as the desired image can be formed, and is adjusted as appropriate. Specifically, it is preferably in the range of 0.05% by mass or more, and more preferably in the range of 0.1% by mass or more, based on the total amount of the non-aqueous ink composition, although it varies depending on the type of coloring material. It is preferably in the range of 20% by mass or less, more preferably in the range of 10% by mass or less, based on the total amount of the non-aqueous ink composition. When the content of the coloring material is in the range of 0.05% by mass or more or in the range of 20% by mass or less, an excellent balance between the dispersion stability and the coloring power of the coloring material can be obtained.
  • a dispersant may be used as necessary in the non-aqueous ink composition according to the present embodiment.
  • the dispersant the same coloring material as that contained in the maintenance liquid can be used.
  • the content of the dispersant is not particularly limited, but the lower limit of the content of the dispersant is preferably in the range of 0.1% by mass or more, and in the range of 0.5% by mass or more, based on the total amount of the non-aqueous ink composition. More preferably, it is in the range of 0.8% by mass or more.
  • the content of the dispersant is not particularly limited, but the lower limit of the content of the dispersant is preferably in the range of 5.0% by mass or more, and 4.0% by mass or more in the total amount of the non-aqueous ink composition. More preferably, it is in the range of 3.0% by mass or more. This makes it possible to effectively disperse the dispersibility of the pigment in the non-aqueous ink composition, and effectively suppress the formation of solids in the non-aqueous ink composition.
  • a dispersing aid may be used as necessary in the non-aqueous ink composition according to the present embodiment.
  • the dispersing aid is adsorbed on the surface of the coloring material (pigment), and the functional group increases the affinity with the organic solvent and dispersant in the ink composition, thereby improving the dispersion stability.
  • a known pigment derivative having a functional group such as an acidic group, a basic group, or a neutral group in the organic pigment residue can be used.
  • a surfactant in the non-aqueous ink composition according to the present embodiment, for the purpose of suppressing volatilization and solidification of the ink composition in devices such as nozzles and tubes, and resolubility when solidified, A surfactant may be added for the purpose of reducing the surface tension and improving the wettability with the recording medium (substrate).
  • the non-aqueous ink composition according to the present embodiment includes stabilizers such as antioxidants and ultraviolet absorbers, epoxides and the like, polyvalent carboxylic acids, surface conditioners, slip agents, leveling agents (acrylic, silicone, etc.). ), defoamers, pH adjusters, bactericides, preservatives, deodorants, charge control agents, wetting agents, and other known additives as optional components.
  • stabilizers such as antioxidants and ultraviolet absorbers, epoxides and the like, polyvalent carboxylic acids, surface conditioners, slip agents, leveling agents (acrylic, silicone, etc.).
  • defoamers such as antioxidants and ultraviolet absorbers, epoxides and the like, polyvalent carboxylic acids, surface conditioners, slip agents, leveling agents (acrylic, silicone, etc.).
  • defoamers such as antioxidants and ultraviolet absorbers, epoxides and the like, polyvalent carboxylic acids, surface conditioners, slip agents, leveling agents (acrylic
  • Specific examples include BHA (2,3-butyl-4-oxyanisole) and BHT (2,6-di-t-butyl-p-cresol).
  • a benzophenone-based compound or a benzotriazole-based compound can be used as the ultraviolet absorber.
  • Specific examples of the epoxidized product include epoxy glyceride, epoxy fatty acid monoester, and epoxy hexahydrophthalate, and specific examples include ADEKA CIZER O-130P and ADEKA CIZER O-180A (manufactured by ADEKA). exemplified.
  • Specific examples of polycarboxylic acids include citric acid and maleic acid.
  • the above ink set can be produced by producing the above maintenance liquid and producing the above non-aqueous ink composition.
  • the above maintenance liquid is produced by mixing an organic solvent containing a lactone-based solvent and organic solvent A, and various components (for example, resins, coloring materials, etc.) as necessary using a paint shaker. can be done. At this time, each component may be dispersed with zirconia beads. Further, if necessary, after preparing a dispersion in which a coloring material is dispersed in a specific solvent, other components may be added to prepare the ink composition.
  • the maintenance liquid according to the present embodiment may be adjusted to a desired dissolved oxygen amount and dissolved nitrogen amount by performing degassing or the like as necessary.
  • the above ink composition can also be produced in the same manner as the maintenance liquid.
  • a maintenance method is a method of performing maintenance on an inkjet recording apparatus using the maintenance liquid described above. Since the above maintenance liquid is excellent in moisturizing and cleaning properties, if the maintenance method is to maintain an inkjet recording apparatus using this maintenance liquid, it will not adhere to the inside of the ink flow path, etc. due to its cleaning properties. It becomes possible to remove the components derived from the ink composition.
  • the ink flow path of the inkjet recording apparatus includes an ink composition container for storing the ink composition, and a supply channel (a tube or the like) for supplying the ink composition from the ink composition container (ink cartridge, bottle, etc.) to the inkjet head. dampers, etc.), flow paths for circulating the ink composition to the nozzle openings in the inkjet head, and the like.
  • the maintenance method includes, for example, circulating the maintenance liquid through the ink flow path of the inkjet recording apparatus.
  • the ink composition is discharged from an inkjet recording apparatus filled with the ink composition, and then the above maintenance liquid is circulated.
  • a method of circulating the maintenance liquid from the upstream of the ink flow path without discharging the maintenance liquid and discharging the ink composition, or discharging the maintenance liquid from the inkjet recording apparatus filled with the maintenance liquid, and then discharging the ink Examples include a method of circulating the composition and a method of circulating the ink composition from the upstream of the ink flow path and discharging the maintenance liquid from the inkjet recording apparatus filled with the maintenance liquid without discharging the maintenance liquid.
  • the distribution and discharge of the maintenance liquid described above may be performed using a normal cleaning operation of the inkjet recording apparatus.
  • the maintenance method for the head cap, wiper, flushing area, platen, nozzle plate, ink mist attachment point in the housing, etc. of the inkjet recording apparatus is not particularly limited. , a method in which maintenance liquid is adhered and, if necessary, the maintenance liquid is wiped off.
  • a wiping member rubber-based or fiber-based
  • a wiper may be immersed in the maintenance liquid to wipe off members to which the ink composition adheres, such as the nozzle openings of the inkjet head.
  • a cap having a through-hole is placed over the nozzle opening of the inkjet head, and a suction pump communicating with the through-hole via a tube generates a negative pressure in the cap, and the maintenance liquid is supplied to the inkjet recording apparatus. may be circulated in the ink flow path.
  • Inkjet recording device ⁇ A conventionally known inkjet recording apparatus can be used as the inkjet recording apparatus according to the present embodiment in which the ink set described above is used. Specifically, such an inkjet recording apparatus is an inkjet recording apparatus using the ink set described above, and is an inkjet recording apparatus including a reservoir containing the maintenance liquid contained in the ink set described above. As the inkjet recording apparatus, for example, an inkjet printer such as VersaArt RE-640, manufactured by Roland DG Co., or the like can be used.
  • the inkjet recording apparatus includes a storage section containing a maintenance liquid and a storage section containing an ink composition, and the ink composition stored in the storage section can be inkjet-discharged from an inkjet head.
  • the inkjet head may be a piezo inkjet head using piezoelectric elements or a thermal inkjet head using a heating element, and is not particularly limited.
  • the inkjet recording apparatus performs recording using the above non-aqueous ink composition, and includes a storage section containing the above non-aqueous ink composition.
  • the maintenance liquid contained in the above ink set contains a lactone solvent and an organic solvent A having a boiling point of 240° C. or more and 310° C. or less, and can effectively remove components derived from the non-aqueous ink composition.
  • the non-aqueous ink composition means an ink composition containing an organic solvent produced without intentionally containing water, unlike an aqueous ink composition containing water as a main component.
  • non-aqueous maintenance liquids Production of Maintenance Liquid Maintenance liquids (non-aqueous maintenance liquids) of test examples were produced by mixing each component in the proportions shown in Table 1 below. The unit is % by mass.
  • the non-aqueous maintenance liquid means a maintenance liquid that does not intentionally contain water and does not substantially contain water.
  • Drying property was evaluated for the maintenance liquid of the test example.
  • a printer (trade name VersaArt RE-640, manufactured by Roland DG Co., Ltd.) is filled with genuine magenta ink, and 100% ink is printed on a recording medium (polyvinyl chloride film with glue (IMAGin JT5829R: manufactured by MACtac)). % density to obtain a recorded matter 1.
  • the genuine ink was discharged and the maintenance liquids of Examples and Comparative Examples were filled by the ink replacement operation of the printer.
  • the maintenance liquid was discharged, and the maintenance liquid was filled again. That is, the ink replacement operation was performed twice.
  • the maintenance liquid was discharged, and the printer was left in a non-humidified constant temperature room at 40° C. for 5 days, then taken out to a 20° C. environment and allowed to cool for 1 day.
  • genuine magenta ink was filled by the ink replacement operation of the printer, solid printing was performed on the recording medium at a density of 100%, and recorded matter 2 was obtained.
  • X-Rite eXact manufactured by X-Rite Co., Ltd.
  • the colors of recorded matter 1 and 2 were measured under the conditions of a viewing angle of 2°, a measurement range of 4 mm ⁇ , and a D65 light source.
  • Evaluation 4 The weight change rate is 3% or more and less than 5%, and there is no deterioration of the material of the epoxy adhesive.
  • Evaluation 3 The weight change rate is 5% or more and less than 10%, and there is no deterioration of the material of the epoxy adhesive.
  • Evaluation 2 The weight change rate is 10% or more and less than 15%, and there is no deterioration of the material of the epoxy adhesive.
  • Evaluation 1 The weight change rate is 15% or more and/or the material of the epoxy adhesive is deteriorated.
  • the ejection properties of the ink compositions of the test examples were evaluated. Specifically, an inkjet recording apparatus (trade name: VersaArt RE-640, manufactured by Roland DG Co., Ltd.) is filled with an ink composition, and a recording medium (polyvinyl chloride film with glue (IMAGin JT5829R: manufactured by MACtac)) is prepared. 2) Bi-directional high-speed printing mode (360 x 720 dpi), solid and thin lines are printed continuously at a substrate surface temperature of 40°C, and the presence or absence of missing dots, flight deflection, and ink splattering are visually observed, and the number of occurrences is counted. bottom. (Indicated as "discharging property" in the table).
  • Evaluation 5 Fine lines are correctly reproduced.
  • Evaluation 4 Fine lines are generally correctly reproduced.
  • Evaluation 3 A slight bend is observed in the thin wire.
  • Evaluation 2 The landing position is displaced and bending is observed.
  • Evaluation 1 The displacement of the landing position is severe, and fine lines cannot be reproduced.
  • washability was evaluated for the ink sets of Examples and Comparative Examples. Specifically, 0.5 g of the ink composition of the test example was placed in a glass petri dish, placed in an oven at 60° C. and heated for 2 hours to dry the ink composition and precipitate components derived from the ink composition. Then, it was allowed to cool to 25° C., and 1.0 g of the maintenance liquids of Examples and Comparative Examples were dropped onto the solidified components derived from the ink compositions, and the solubility (washability) thereof was visually evaluated (in the table). , labeled as “washability”). Evaluation Criteria Evaluation 5: All the solidified components were dissolved, and no solidified components remained.
  • Evaluation 4 All the solidified components were dissolved, and almost no solidified components remained. Evaluation 3: All of the solidified components were dissolved, but some of them were not dissolved. Evaluation 2: All the solidified ingredients were dissolved, but most of the dissolved lumps were not dissolved. Evaluation 1: The solidified component did not dissolve.
  • DEDG diethylene glycol diethyl ether.
  • GBL in the table is ⁇ -butyrolactone.
  • BGT in the table is triethylene glycol monobutyl ether.
  • MEDG in the table is diethylene glycol ethyl methyl ether.
  • colorant means a colorant corresponding to each color.
  • Other solids in the table are components different from organic solvents such as resins and pigment dispersants, and coloring materials.
  • DBL in the table is ⁇ -valerolactone.
  • dPGmME in the table is dipropylene glycol monomethyl ether.
  • TetraEGmBE in the table is tetraethylene glycol monobutyl ether.
  • MOZ in the table is 3-methyl-2-oxazolidinone.
  • a maintenance liquid containing a lactone solvent and an organic solvent having a predetermined boiling point is excellent in moisturizing properties, and an ink composition containing a predetermined organic solvent, a coloring material, and a resin. It can be seen that the detergency for the solidified component derived from is also excellent.

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Abstract

La présente invention concerne un ensemble d'encres comprenant un fluide de maintenance excellent sur le plan de la propriété humectante et de la propriété nettoyante.　Le jeu d'encres comprend une composition d'encre non aqueuse à délivrer par un dispositif d'enregistrement à jet d'encre et un fluide d'entretien à utiliser dans le dispositif d'enregistrement à jet d'encre, le fluide d'entretien comprenant des solvants organiques, les solvants organiques contenus dans le fluide d'entretien comprenant un solvant à base de lactone et un solvant organique A possédant un point d'ébullition de 240 à 310 °C, et la composition d'encre non aqueuse comprend des solvants organiques, une résine et un colorant, les solvants organiques contenus dans la composition d'encre non aqueuse comprenant un éther dialkylique d'alkylène glycol, un solvant à base de lactone et un solvant organique B possédant un point d'ébullition de 240 à 310 °C.
PCT/JP2022/047689 2021-12-28 2022-12-23 Ensemble d'encres WO2023127740A1 (fr)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008274016A (ja) * 2007-04-25 2008-11-13 Toyo Ink Mfg Co Ltd インクジェットプリンター用メンテナンス液
JP2016165871A (ja) * 2015-03-10 2016-09-15 セイコーエプソン株式会社 メンテナンス液及びメンテナンス方法
JP2017186451A (ja) * 2016-04-06 2017-10-12 セイコーエプソン株式会社 溶剤系メンテナンス液及びインクジェット記録装置のメンテナンス方法
JP2017190374A (ja) * 2016-04-12 2017-10-19 東洋インキＳｃホールディングス株式会社 インクジェットインキセット

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008274016A (ja) * 2007-04-25 2008-11-13 Toyo Ink Mfg Co Ltd インクジェットプリンター用メンテナンス液
JP2016165871A (ja) * 2015-03-10 2016-09-15 セイコーエプソン株式会社 メンテナンス液及びメンテナンス方法
JP2017186451A (ja) * 2016-04-06 2017-10-12 セイコーエプソン株式会社 溶剤系メンテナンス液及びインクジェット記録装置のメンテナンス方法
JP2017190374A (ja) * 2016-04-12 2017-10-19 東洋インキＳｃホールディングス株式会社 インクジェットインキセット

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