WO2011136009A1 - 印刷物製造方法 - Google Patents
印刷物製造方法 Download PDFInfo
- Publication number
- WO2011136009A1 WO2011136009A1 PCT/JP2011/058986 JP2011058986W WO2011136009A1 WO 2011136009 A1 WO2011136009 A1 WO 2011136009A1 JP 2011058986 W JP2011058986 W JP 2011058986W WO 2011136009 A1 WO2011136009 A1 WO 2011136009A1
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- WIPO (PCT)
- Prior art keywords
- ink
- paper
- image
- active energy
- printed matter
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M7/00—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock
- B41M7/0081—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock using electromagnetic radiation or waves, e.g. ultraviolet radiation, electron beams
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M7/00—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock
- B41M7/009—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock using thermal means, e.g. infrared radiation, heat
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/02—Printing inks
- C09D11/10—Printing inks based on artificial resins
- C09D11/101—Inks specially adapted for printing processes involving curing by wave energy or particle radiation, e.g. with UV-curing following the printing
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/30—Inkjet printing inks
- C09D11/38—Inkjet printing inks characterised by non-macromolecular additives other than solvents, pigments or dyes
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/43—Thickening agents
Definitions
- the present invention relates to a method for forming an image on a recording medium, which is a printing material, by an inkjet method using an active energy ray-curable ink. More specifically, the present invention is excellent in image abrasion resistance and gloss uniformity. The present invention relates to a method for producing a printed matter having excellent image density uniformity.
- the inkjet recording method is capable of recording high-definition images with a relatively simple device, and has been rapidly developed in various fields.
- a recording medium or ink suitable for each purpose is used.
- ink is ejected from an ink jet head and landed on a recording medium to form an image.
- the ink In order to eject the ink from the ink jet head, the ink needs to have a low viscosity.
- high-viscosity inks are necessary to prevent color mixing called bleeding.
- an ultraviolet curable inkjet using an active energy ray-curable ink has been put into practical use. This is because an active energy ray-curable monomer and a photopolymerization initiator are added to the ink, and the ink is cured by irradiating the recording medium with an active energy ray after landing, thereby ensuring emission and preventing bleeding. It is a technology to achieve both.
- a bleed prevention technique for example, as described in JP-A-2007-154188 and JP-A-2007-154189, it is usually a solid phase and exists as a liquid phase at a high operating temperature of an inkjet printing apparatus.
- the ink when ink droplets land on the surface of the recording material, the ink rapidly solidifies without spreading in the area direction of the recording material, and an image with high resolution can be formed. Since the active energy ray-curable ink and the hot melt ink do not contain a solvent in the ink component, an image can be formed even on a recording material having no ink absorbability.
- the active energy ray-curable ink component contains a material that causes a gelling action due to temperature change, and after the ink ejected from the inkjet head has landed on the recording material, A technique for forming an image by temperature change and active energy ray irradiation is disclosed (see Patent Document 1).
- the technique described in Patent Document 2 has an effect that, when UV light is applied after heating pressure is applied after image formation, the height of the dots forming the image is suppressed, and the uncomfortable glossiness is eliminated.
- the roller and other members used for fixing become dirty while fixing, periodic cleaning is necessary. If the roller surface is damaged during use, the unevenness is transferred to the image surface.
- the image quality may be deteriorated. This phenomenon is also a problem encountered in the case of a printing method using an intermediate transfer medium.
- Patent Document 3 the technology described in Patent Document 3 is described in, for example, the document hermetic Effect on the penetration of an ink droplet onto a porous medium (Massheng Ren, Herman Wijshoff, 5th European-Tence. Furthermore, after the hot hot melt ink is ejected from the inkjet head and landed on the recording medium, it takes only a much shorter time than 100 ms for the droplet temperature to drop to near room temperature. This is not sufficient to prevent image non-uniformity of image gloss.
- An object of the present invention has been made in view of the above problems, and provides a printed matter production method that gives a printed matter having an image having excellent image abrasion resistance, excellent gloss uniformity, and excellent image density uniformity. It is in.
- a method for producing a printed matter comprising the step (A) of applying an electromagnetic wave having a wavelength longer than the absorption wavelength of the polymerization initiator to the recording medium from the side on which an image is formed.
- step (A) is after the discharging step.
- the present invention provides a discharge step of supplying droplets of an active energy ray-curable inkjet ink containing a polymerizable compound, a photopolymerization initiator, and a gelling agent onto a recording medium by ejecting the droplets from an inkjet recording head, and
- a printed matter manufacturing method comprising an active energy ray irradiating step of irradiating an ink jet ink ejected on a recording medium with an active energy ray to form an image, wherein the ink jet ink is placed in the ink jet ink before the active energy ray irradiating step. It has a step (A) of applying an electromagnetic wave having a wavelength longer than the absorption wavelength of the contained photopolymerization initiator to the recording medium from the image forming surface side.
- an electromagnetic wave having a wavelength longer than the absorption wavelength of the photopolymerization initiator contained in the inkjet ink is recorded from the side on which the image is formed.
- the polymerizable compound according to the present invention is a compound that can be polymerized by the photopolymerization initiator according to the present invention, and either a radical polymerizable compound or a cationic polymerizable compound can be selected.
- the radical polymerizable compound is a compound having an ethylenically unsaturated bond capable of radical polymerization, and may be any compound as long as it has at least one ethylenically unsaturated bond capable of radical polymerization in the molecule. , Oligomers, polymers and the like having a chemical form. Only one kind of radically polymerizable compound may be used, or two or more kinds thereof may be used in combination at an arbitrary ratio in order to improve desired properties.
- Examples of compounds having an ethylenically unsaturated bond capable of radical polymerization include unsaturated carboxylic acids such as acrylic acid, methacrylic acid, itaconic acid, crotonic acid, isocrotonic acid, maleic acid and their salts, esters, urethanes, amides. And radically polymerizable compounds such as unsaturated monomers, acrylonitrile, styrene, various unsaturated polyesters, unsaturated polyethers, unsaturated polyamides, and unsaturated urethanes.
- the amount of the radical polymerizable compound added is preferably 1 to 97% by mass, more preferably 30 to 95% by mass.
- Examples of the cationic polymerizable compound include an epoxy compound, an oxetane compound, and a vinyl ether compound.
- epoxy compound any of monomers, oligomers, and polymers that are usually used as epoxy resins can be used. Specific examples include conventionally known aromatic epoxides, alicyclic epoxides, and aliphatic epoxides.
- the epoxide means a monomer or an oligomer thereof. These compounds may be used alone or in combination of two or more as required.
- the aromatic epoxide is a di- or polyglycidyl ether produced by the reaction of a polyhydric phenol having at least one aromatic nucleus or an alkylene oxide adduct thereof and epichlorohydrin, such as bisphenol A or an alkylene thereof.
- a polyhydric phenol having at least one aromatic nucleus or an alkylene oxide adduct thereof and epichlorohydrin, such as bisphenol A or an alkylene thereof.
- examples thereof include di- or polyglycidyl ethers of oxide adducts, di- or polyglycidyl ethers of hydrogenated bisphenol A or alkylene oxide adducts thereof, and novolak-type epoxy resins.
- examples of the alkylene oxide include ethylene oxide and propylene oxide.
- Examples of the alicyclic epoxide include cyclohexene oxide or cyclopentene obtained by epoxidizing a compound having at least one cycloalkane ring such as cyclohexene or cyclopentene ring with a suitable oxidizing agent such as hydrogen peroxide or peracid.
- Oxide-containing compounds are preferred, and specific examples include, for example, Celoxide 2021, Celoxide 2021A, Celoxide 2021P, Celoxide 2080, Celoxide 2000, Epoxide GT301, Epolide GT302, Epolide GT401, Epolide GT403, EHPE-3150, manufactured by Daicel Chemical Industries, Ltd. EHPEL3150CE; Union Carbide UVR-6105, UVR-6110, UVR-6128, UVR-6100, UVR-62 6, UVR-6000, and the like can be given.
- Preferable aliphatic epoxides include di- or polyglycidyl ethers of aliphatic polyhydric alcohols or alkylene oxide adducts thereof, and typical examples thereof include ethylene glycol diglycidyl ether, propylene glycol diglycidyl ether or 1, Diglycidyl ethers of alkylene glycols such as 6-hexanediol diglycidyl ether, polyglycidyl ethers of polyhydric alcohols such as di- or triglycidyl ethers of glycerin or alkylene oxide adducts thereof, diglycidyl of polyethylene glycol or alkylene oxide adducts thereof Polyalkylene glycol jigs such as ether, polypropylene glycol or diglycidyl ether of alkylene oxide adducts thereof Glycidyl ether and the like.
- examples of the alkylene oxide include ethylene oxide and propylene oxide.
- monoglycidyl ethers of higher aliphatic alcohols and phenols can also be used.
- aromatic epoxides and alicyclic epoxides are preferable, and alicyclic epoxides are particularly preferable in consideration of fast curability.
- An oxetane compound is a compound having one or more oxetane (trimethylene oxide) rings in the molecule. Specifically, 3-ethyl-3-hydroxymethyloxetane (manufactured by Toagosei Co., Ltd .: OXT101, etc.), 1,4-bis [(3-ethyl-3-oxetanyl) methoxymethyl] benzene (OXT121, etc.), 3- Ethyl-3- (phenoxymethyl) oxetane (same as OXT211), di (1-ethyl-3-oxetanyl) methyl ether (same as XT221), 3-ethyl-3- (2-ethylhexyloxymethyl) oxetane (same as above) OXT212, etc.), di (1-methyl-3-oxetanyl) methyl ether, etc.
- 3-ethyl-3-hydroxymethyloxetane, 3-ethyl-3- (phenoxymethyl) oxetane, di (1 -Ethyl-3-oxetanyl) methyl ether is preferred. These can be used alone or in combination of two or more.
- the vinyl ether compound refers to an organic compound having a vinyl ether group, and preferably a compound having a molecular weight of 100 to 2,000. Within the above molecular weight range, excellent abrasion resistance, good density of polymerized groups, and sufficient distance between polymerized groups and polymerized groups, so high-speed and flexible images can be formed using an inkjet method. I can do it. Specifically, the following compounds can be preferably used.
- the viscosity can be adjusted by adding a vinyl ether oligomer.
- VECTOMER divinyl ether resin from Allied Signal (for example, VECTOMER 2010, VECTOMER 2020, VECTOMER 4010, and VECTOMER). 4020 and equivalents available from other manufacturers) and mixtures thereof.
- a blend (arbitrary ratio) of one or more types of vinyl ether resins and / or one or more types of epoxy resins can also be used.
- Polyhydroxy functional materials such as those described in US Pat. No. 5,856,373 (Kaisaki et al.)
- epoxy- and / or vinyl ether-functional materials are also used. It can also be used.
- the polymerization initiator according to the present invention is capable of initiating polymerization of a polymerizable compound by irradiation with active energy rays, and radical polymerization initiators, photoacid generators, and the like can be used.
- radical polymerization initiators examples include the following.
- transition metal complexes containing a transition metal such as ruthenium described in JP-A-2-182701, described in JP-A-3-209477 2,4,5-triarylimidazole dimer, carbon tetrabromide, and organic halogen compounds described in JP-A-59-107344.
- photopolymerization initiators are preferably contained in the range of 0.01 to 10% by mass with respect to 100% by mass of the polymerizable compound.
- Photoacid generators include arylsulfonium salt derivatives (Syracure UVI-6990, Syracure UVI-6974, manufactured by Union Carbide, Inc .; Adekaoptomer SP-150, Adekaoptomer SP-152, Adekaoptomer SP-152, manufactured by ADEKA.
- Adekaoptomer SP-172 CPI-100, CPI-110P, CPI-110A from San Apro, TS-91 from Sanwa Chemical, Esacure 1187 from Lamberti, Esacure 1188, etc.
- allyl iodonium Salt derivatives such as RP-2074 manufactured by Rhodia, Irgacure 250 manufactured by BASF Japan
- allene-ion complex derivatives such as Irgacure 250 manufactured by BASF Japan
- diazonium salt derivatives triazine initiators And acid generating agents such as other halides.
- These acid generators are preferably contained in a ratio of 0.2 to 10 parts by mass, and further 0.5 to 5 parts by mass with respect to 100 parts by mass of the polymerizable compound.
- These initiators can be used alone or in combination of two or more.
- sensitizer for the initiator examples include anthracene and anthracene derivatives (such as ADEKA OPTMER SP-100, diethoxyanthracene, and dibutoxyanthracene manufactured by ADEKA) when a sulfonium salt is used as the initiator.
- an iodonium salt is used as an initiator
- thioxanthones can be used.
- the amount added is preferably 0.2 to 5 parts by mass, more preferably 0.5 to 4 parts by mass, relative to 100 parts by mass of the polymerizable compound.
- the gelling agent according to the present invention is a compound that can reversibly gel an inkjet ink.
- ink composition A compound capable of reversibly gelling inkjet ink (hereinafter also referred to as ink composition) will be described.
- the “gel” state in the present invention refers to a structure in which a solute loses its independent mobility due to a lamellar structure, a polymer network formed by covalent bonding or hydrogen bonding, or a polymer network formed by physical aggregation. It means a solidified or semi-solidified state with a sudden increase in viscosity and a significant increase in elasticity.
- the gel state formed by the compound capable of reversibly gelling the ink composition according to the present invention is a thermoreversible gel (a fluid solution (sometimes called a sol) by heating). . That is, the ink composition used in the present invention exhibits a thermoreversible transition between the gel state and the liquid state, and this cycle of gel reforming can be repeated several times.
- the compound capable of reversibly gelling the ink composition preferably used in the present invention include fatty acid inulins such as inulin stearate, fatty acid dextrins such as dextrin palmitate and dextrin myristate (Chiba as Leopard series). And glyceryl behenate eicosane diacid, eicosane diacid polyglyceryl behenate (available from Nisshin Oilio as Nomcoat series), and the like.
- low-molecular oil gelling agents described in JP-A-2005-126507, JP-A-2005-255821, and JP-A-2010-111790 N-lauroyl-L-glutamic acid dibutylamide, N-2 ethyl Amide compounds such as hexanoyl-L-glutamic acid dibutylamide (available from Ajinomoto Finetechno), 1,3: 2,4-bis-O-benzylidene-D-glucitol (available from Gelol D Shin Nippon Rika), etc.
- Dibenzylidene sorbitols petroleum waxes such as paraffin wax, microcrystalline wax, petrolactam, plant systems such as candelilla wax, carnauba wax, rice wax, wood wax, jojoba oil, jojoba solid wax, jojoba ester Wax, beeswax, la Animal waxes such as phosphorus and whale wax, mineral waxes such as montan wax and hydrogenated wax, hardened castor oil or hardened castor oil derivatives, montan wax derivatives, paraffin wax derivatives, microcrystalline wax derivatives or polyethylene wax derivatives
- Modified fatty acids such as behenic acid, arachidic acid, stearic acid, palmitic acid, myristic acid, lauric acid, oleic acid, erucic acid, higher alcohols such as stearyl alcohol and behenyl alcohol, and 12-hydroxystearic acid Such as hydroxystearic acid, 12-hydroxystearic acid derivatives, lauric acid amide, stearic acid amide
- Synthetic waxes such as polyethylene wax, ⁇ -olefin maleic anhydride copolymer wax, and polymerizable wax (UNILIN series Baker-Petrolite) ), Dimer acid, dimer diol (manufactured by PRIPOL series CRODA), compounds represented by the following compounds OG-1 to OG-15, and the like.
- said gelling agent may be used independently and may be used in mixture of 2 or more types.
- stearyl stearate behenyl behenate, ethylene glycol distearate, diethylene glycol distearate, triethylene glycol distearate, monoglyceride stearate, diglyceride stearate, pentaerythritol distearate, having a melting point of 40 to 100 ° C.
- Fatty acid esters such as pentaerythritol stearate, sorbitan monostearate and sorbitan distearate, and ketone waxes such as stearone and laurone are preferably used.
- the ink-jet ink according to the present invention preferably contains a gelling agent as described above and undergoes phase transition at a temperature of 25 ° C. or higher.
- the phase transition at 25 ° C. or more means that the inkjet ink has a phase transition point at a temperature of 25 ° C. or more, and the temperature of the phase transition point is a value measured by the following differential scanning calorimetry.
- DSC Differential Scanning Thermal Analysis
- phase transition temperature is preferably 40 ° C. or higher and 100 ° C. or lower from the viewpoint of dot coalescence prevention properties and heat polymerization prevention properties, and more preferably 45 ° C. or higher and 80 ° C. or lower.
- the gelling agent is preferably a compound that gels at 40 ° C. to 100 ° C., that is, causes a phase transition.
- the gelling agent is preferably contained in the range of 3.0 to 20% by mass with respect to the inkjet ink.
- the ink-jet ink according to the present invention is gel or solid at 25 ° C., and preferably has a viscosity of 60 to 200 mPa seconds at a shear rate of 1000 / second at 25 ° C.
- the viscosity is a value obtained by measuring the viscosity at an ink temperature of 25 ° C. and a shear rate of 1000 / second using a rheometer: MCR300 manufactured by Paar Physica.
- the gel-like state refers to a state in which the fluidity is remarkably lowered although it is deformed by stress.
- the inkjet ink according to the present invention may contain a basic compound in order to improve ejection stability.
- basic compound all known compounds can be used, and representative examples include basic alkali metal compounds, basic alkaline earth metal compounds, basic organic compounds such as amines, and the like.
- Basic alkali metal compounds include alkali metal hydroxides (lithium hydroxide, sodium hydroxide, potassium hydroxide, etc.), alkali metal carbonates (lithium carbonate, sodium carbonate, potassium carbonate, etc.), alkali metal alcoholates. (Sodium methoxide, sodium ethoxide, potassium methoxide, potassium ethoxide, etc.).
- basic alkaline earth metal compounds include alkaline earth metal hydroxides (magnesium hydroxide, calcium hydroxide, etc.), alkali metal carbonates (magnesium carbonate, calcium carbonate, etc.), and alkali metal alcoholates. (Magnesium methoxide, etc.).
- Examples of the basic organic compound include amines and nitrogen-containing heterocyclic compounds such as quinoline and quinolidine.
- amines are preferable from the viewpoint of compatibility with the photopolymerization monomer, for example, octylamine, naphthylamine, Xylenediamine, dibenzylamine, diphenylamine, dibutylamine, dioctylamine, dimethylaniline, quinuclidine, tributylamine, trioctylamine, tetramethylethylenediamine, tetramethyl-1,6-hexamethylenediamine, hexamethylenetetramine, 2- (methyl And amino) ethanol and triethanolamine.
- the concentration of the basic compound in the presence thereof is preferably in the range of 10 to 50000 mass ppm, particularly 100 to 5000 mass ppm with respect to the total amount of the photopolymerizable monomer.
- a basic compound may be used individually or may be used in combination of multiple.
- the inkjet ink preferably contains various known dyes and / or pigments, and particularly preferably contains a pigment.
- the pigments that can be preferably used in the present invention are listed below.
- Pigment Black 7 For the dispersion of the pigment, for example, a ball mill, sand mill, attritor, roll mill, agitator, Henschel mixer, colloid mill, ultrasonic homogenizer, pearl mill, wet jet mill, paint shaker, or the like can be used. Further, a dispersing agent can be added when dispersing the pigment.
- a dispersant a polymer dispersant is preferably used, and examples of the polymer dispersant include Avecia's Solsperse series and Ajinomoto Fine-Techno's PB series.
- dispersion aids are preferably added in an amount of 1 to 50 parts by mass with respect to 100 parts by mass of the pigment.
- the dispersion medium is used using a solvent or a polymerizable compound.
- the radiation curable ink used in the present invention is preferably solvent-free because it reacts and cures immediately after ink landing. If the solvent remains in the cured image, the solvent resistance deteriorates and the VOC of the remaining solvent arises. Therefore, it is preferable in view of dispersibility that the dispersion medium is not a solvent but a polymerizable compound, and among them, a monomer having the lowest viscosity is selected.
- the pigment is preferably dispersed so that the average particle diameter of the pigment particles is 0.08 to 0.2 ⁇ m, and the maximum particle diameter is 0.3 to 10 ⁇ m, preferably 0.3 to 3 ⁇ m.
- the selection of the dispersion medium, the dispersion conditions, and the filtration conditions are appropriately set. By controlling the particle size, clogging of the head nozzle can be suppressed, and ink storage stability, ink transparency, and curing sensitivity can be maintained.
- the concentration of the color material is preferably 1% by mass to 10% by mass of the entire inkjet ink.
- the ink-jet ink according to the present invention may contain various additives such as a surfactant, a lubricant, a filler, a rust inhibitor, an antifoaming agent, a thickener, a gelling agent, and polymers as necessary. I can do it. If necessary, a small amount of a solvent such as an ester solvent, an ether solvent, an ether ester solvent, a ketone solvent, an aromatic hydrocarbon solvent, or a nitrogen-containing organic solvent can be added.
- a solvent such as an ester solvent, an ether solvent, an ether ester solvent, a ketone solvent, an aromatic hydrocarbon solvent, or a nitrogen-containing organic solvent can be added.
- the ink-jet ink according to the present invention is produced by thoroughly dispersing a polymerizable compound, a photopolymerization initiator, a gelling agent together with a pigment dispersant, and the pigment using an ordinary dispersing machine such as a sand mill. It is preferable to prepare a concentrated solution having a high pigment concentration in advance and dilute with a polymerizable compound.
- the prepared ink is preferably filtered with a filter having a pore diameter of 3 ⁇ m or less, and more preferably 1 ⁇ m or less.
- the pigment is preferably dispersed with an average particle size of 0.08 to 0.5 ⁇ m, and the maximum particle size of 0.3 to 10 ⁇ m, preferably 0.3 to 3 ⁇ m.
- Set selection, dispersion conditions, and filtration conditions By controlling the particle size, clogging of the head nozzle can be suppressed, and ink storage stability, ink transparency, and curing sensitivity can be maintained.
- the amount of pigment or oil-soluble dye added is preferably 0.1 to 20% by mass, more preferably 0.4 to 10% by mass. If it is 0.1% by mass or more, good image quality can be obtained, and if it is 20% by mass or less, an appropriate ink viscosity in ink ejection can be obtained. In addition, two or more kinds of colorants can be mixed as appropriate for color adjustment.
- Examples of the recording medium used in the present invention include polyester, polyvinyl chloride, polyethylene, polyurethane, polypropylene, acrylic resin, polycarbonate, polystyrene, acrylonitrile-butadiene-styrene copolymer, polyethylene terephthalate, polybutadiene terephthalate, and the like. Examples thereof include films made of resins, substrates having these resins on their surfaces, metals, glass, and printing paper.
- coated paper there is a non-coated paper, as the coated paper, the coating amount per 1m 2 is one side 20g before and after of art paper, coating amount per 1m 2 of the front and rear single-sided 10g Court paper, the coating amount per 1m 2 can be mentioned one side 5g before and after of lightweight coated paper, Binurikoshi, mat coated paper matte finish, Darukoto paper of dull finish, such as newsprint.
- Non-coated paper includes printing paper A using 100% chemical pulp, printing paper B using 70% or more chemical pulp, printing paper C using 40% or more and less than 70% chemical pulp, and printing using less than 40% chemical pulp.
- Examples thereof include paper D, gravure paper containing mechanical pulp and subjected to calendar treatment. Further details are described in detail in the "Latest Paper Processing Handbook” edited by the Paper Processing Handbook Editorial Committee, Tech Times, and "Printing Engineering Handbook” edited by the Japan Printing Society.
- plain paper can be used.
- the plain paper is 80 to 200 ⁇ m uncoated paper belonging to a part of uncoated paper, special printing paper and information paper.
- plain paper examples include advanced printing paper, intermediate printing paper, lower printing paper, thin printing paper, fine coating printing paper, special printing paper such as fine-quality printing paper, form paper, PPC paper, and other information paper.
- plain paper examples include advanced printing paper, intermediate printing paper, lower printing paper, thin printing paper, fine coating printing paper, special printing paper such as fine-quality printing paper, form paper, PPC paper, and other information paper.
- special printing paper such as fine-quality printing paper, form paper, PPC paper, and other information paper.
- the present invention is not particularly limited to these.
- Specific examples of the recording medium include the following.
- the above active energy ray-curable inkjet ink droplets according to the present invention are ejected from an inkjet recording head and supplied to a recording medium to form an image.
- the ink jet recording head according to the present invention may be an on-demand system or a continuous system.
- Discharge methods include electro-mechanical conversion methods (eg, single cavity type, double cavity type, bender type, piston type, shear mode type, shared wall type, etc.), electro-thermal conversion methods (eg, thermal ink jet) Specific examples include molds, bubble jet (registered trademark) types, electrostatic attraction methods (for example, electric field control types, slit jet types, etc.), discharge methods (for example, spark jet types, etc.), and the like. .
- any type of ink jet recording head can be used, such as a line head ink jet recording head or a serial ink jet recording head.
- the ink jet recording head and the ink are heated to 35 to 130 ° C. and discharged.
- the ink-jet ink of the present invention has a relatively large viscosity fluctuation range due to temperature fluctuation, and the viscosity fluctuation directly affects the droplet size and droplet ejection speed, so that the temperature is kept within a predetermined range while raising the ink temperature. It is preferable to keep and emit in that state.
- the predetermined temperature range is preferably set temperature ⁇ 5 ° C., more preferably set temperature ⁇ 2 ° C., and further preferably set temperature ⁇ 1 ° C.
- the amount of droplets discharged from each nozzle of the inkjet recording head is 1 to 15 pl.
- the active energy ray irradiating step the inkjet ink ejected on the recording medium is irradiated with the active energy rays to form an image.
- active energy rays examples include ultraviolet rays, visible rays, ⁇ rays, ⁇ rays, ⁇ rays, and X-rays.
- the light source is, for example, a low pressure, medium pressure, high pressure mercury lamp, metal halide lamp, xenon lamp having a light emission wavelength in the ultraviolet region, cold cathode tube, hot cathode tube having an operating pressure of several hundred Pa to 1 MPa.
- Conventionally known products such as LEDs are used.
- the irradiation condition of the active energy ray is that after the ink has landed on the recording medium, and after the application of the electromagnetic wave in the step (A) described below, the actinic ray is applied for 0.001 to 1.0 seconds. Is preferably irradiated, more preferably 0.001 to 0.5 seconds. In order to form a high-definition image, it is preferable that the irradiation timing is as early as possible.
- an active energy ray irradiation method As an active energy ray irradiation method, the following method can be used. For example, there is a method disclosed in JP-A-60-132767. In this method, light sources are provided on both sides of the head unit, and the head and the light sources are scanned by a shuttle method. Irradiation is performed after a certain period of time after ink landing.
- the step (A) is a step before the active energy ray irradiation step, and an electromagnetic wave having a wavelength longer than the wavelength of the absorption wavelength of the photopolymerization initiator contained in the ink-jet ink is used to form an image. To the recording medium.
- An electromagnetic wave having a wavelength longer than the wavelength of the absorption wavelength of the photopolymerization initiator is an electromagnetic wave having a wavelength longer than the wavelength that indicates the absorption maximum of the photopolymerization initiator.
- the electromagnetic waves include visible light, infrared rays, and microwaves. Is mentioned.
- “Applying electromagnetic waves to a recording medium” refers to irradiating the ink and the recording medium with the above-mentioned electromagnetic waves without directly contacting the generation source of the electromagnetic waves with the inkjet ink.
- the reason why a printed matter having an image excellent in image abrasion resistance, gloss uniformity and image density uniformity can be obtained by performing the step (A) is estimated as follows. .
- the strength of the formed image film is insufficient only by phase inversion with a gelling agent (sol ⁇ gel)
- the polymerizable compound contained simultaneously in the ink is cured by irradiation with ultraviolet rays or the like. An image with improved printing durability can be obtained.
- the rapid solidification of the ink droplets after landing increases the height difference between the printed portion and the non-printed portion due to the rising of the landed dots from the recording medium.
- the polymerization property contained in the landed dots by applying an electromagnetic wave longer than the absorption wavelength of the initiator contained in the ink-jet ink after printing and before irradiation with active energy rays to the print portion.
- the compound does not undergo a photopolymerization reaction, and the reversible sol-gel transition reaction of the gelling agent occurs again, and the viscosity of the ink forming the dots is slightly reduced, so that the swell of the dots is suppressed and smoothing occurs.
- the uneven glossiness of the image portion and the non-image portion is eliminated. Further, by reducing the dot height, the lateral load on the dots due to abrasion is reduced, and the abrasion resistance is improved. On the other hand, for example, when warm air is applied to soften the gelling agent contained in the dots, the ink after landing is softened by the heat. It is presumed that the distribution of the liquid is uneven, the liquid is close, color bleeding occurs, and a printed matter having an image having excellent gloss uniformity and excellent image density uniformity cannot be obtained.
- the ink supplied on the recording medium is in a state where the surface of the ink is more heated, so that it is less affected by the thickness of the recording medium, and the ink is efficiently heated. Thereafter, since the heated portion is cooled, the smoothness of the surface is increased, the friction resistance is improved, and the image printing durability is estimated to be excellent.
- the electromagnetic waves are preferably infrared rays, and far infrared rays are preferably used.
- Infrared radiation is an energy ray having a wavelength longer than that of red light and shorter than that of millimeter-wave radio waves, and having a wavelength of about 0.7 ⁇ m to 1 mm, and has the power to warm things.
- far infrared rays give kinetic energy to molecules with electrical polarity, activate the molecular motion, accelerate the molecular motion and generate heat by colliding with other molecules.
- the energy necessary for softening the gelling agent in the ink is efficiently imparted, and once landed, the height of the formed dots is reduced, resulting in a difference in gloss between the printed and non-printed areas. Can eliminate discomfort.
- radio waves having a wavelength of 100 micrometers to 1 meter and a frequency of 300 megahertz to 3 terahertz can be used as energy to be applied.
- the step (A) is a heating step.
- Infrared rays are classified into near infrared rays and far infrared rays based on their wavelengths.
- Near infrared rays are infrared rays having a wavelength of 0.75 to 4 ⁇ m, while far infrared rays having longer wavelengths are infrared rays having a wavelength of 4 to 1000 ⁇ m.
- Examples of the infrared source include a normal infrared lamp, a xenon flash lamp, a xenon lamp, a xenon short arc lamp, a near infrared halogen heater, an infrared LED, an infrared laser, and the like.
- a xenon flash lamp a xenon lamp, a near-infrared halogen heater, an infrared LED, a solid-state laser or a semiconductor laser emitting infrared light having a wavelength of 700 to 1500 nm is used.
- another infrared source may be used as an auxiliary.
- the far-infrared heater used as an infrared drying device a panel-shaped, tubular, or lamp-shaped heater is used.
- Microwave This refers to electromagnetic waves with a wavelength of 100 ⁇ m to 1 m. Heating is possible because charged particles and electric dipoles in a substance rotate or vibrate under the influence of an oscillating electromagnetic field by microwaves.
- a commercially available microwave oven can be used as the microwave radiation source.
- electromagnetic waves are applied from the side (surface) where the inkjet ink of the recording medium is supplied and where the inkjet ink is present, that is, from the side where the image is formed.
- the timing for applying the electromagnetic wave is preferably after the ejection step, particularly preferably immediately after the inkjet ink is supplied to the recording medium.
- the time for applying the electromagnetic wave is preferably 0.1 to 60 seconds, and particularly preferably 5 to 40 seconds.
- the output of the electromagnetic radiation source is preferably adjusted so that the temperature of the inkjet ink is maintained in the range of 60 ° C to 90 ° C.
- the temperature of the inkjet ink can be measured with a non-contact type thermometer.
- Color material C.I. I. Pigment Blue 15: 3 (average particle size: 100 nm) 5 parts by mass Paraffin wax (Nippon Seiwa Co., Ltd., 155) 45 parts by mass Behenic acid (Wako Pure Chemical Industries, Ltd.) 30 parts by mass Oleic acid amide (Kao Co., Ltd., fatty acid amide ON) 20 parts by mass
- the resulting liquid was filtered with a filter under heating and cooled to prepare ink A.
- Cyan pigment dispersion 1 20 parts by mass Polymerizable compound 1: Alicyclic epoxy compound (CEL2021P, manufactured by Daicel Chemical Industries) 15 parts by mass Polymerizable compound 2: Oxetane (OXT221, manufactured by Toagosei Co., Ltd.) 51.5 parts by mass Stearon (manufactured by Alfa Aesar) 10 parts by mass Photopolymerization initiator 1: iodonium salt (IBPF, manufactured by Sanwa Chemical) 2.5 parts by mass Thioxanthone (DETX, manufactured by Nippon Kayaku Co., Ltd.) 1.0 part by mass The above substances were sequentially added and mixed, and then filtered using a filter having an absolute filtration accuracy of 2 ⁇ m to prepare ink B. .
- IBPF iodonium salt
- DETX manufactured by Nippon Kayaku Co., Ltd.
- Photopolymerizable compound 1 Lauryl acrylate (monofunctional) 10 parts by weight
- Photopolymerizable compound 2 Ethylene oxide modified trimethylolpropane triacrylate (trifunctional) 10 parts by weight
- Photopolymerizable compound 3 Caprolactam-modified dipentaerythritol hexaacrylate (hexafunctional) 20 parts by weight
- Photopolymerizable compound 4 Tetraethylene glycol diacrylate (bifunctional) 25 parts by mass Stearon (manufactured by Alfa Aesar) 10 parts by mass
- Polymerization initiator 1 Irgacure 184 (manufactured by BASF Japan) 2.5 parts by mass
- Polymerization initiator 2 Irgacure 907 (manufactured by BASF Japan) 2.5 parts by mass
- the above substances were sequentially added, mixed at 100 ° C., and then filtered using a filter having an absolute filtration accuracy of
- Pigment dispersion 3 20 parts by mass Cyclohexane divinyl ether (CHDVE manufactured by Nippon Carbide Industries Co., Ltd.) 43 parts by mass Vinyl ether oligomer (produced by Vector 2020 Aldrich) 20 parts by mass Stearon (produced by Alfa Aesar) 10 parts by mass TEMPO (2, 2, 6,6-tetramethylpiperidine 1-oxyl) 0.03 parts by mass CPI-100P: 50% solution of triallylsulfonium salt in propylene carbonate (manufactured by San Apro) 2 parts by mass After sequentially adding the above substances and mixing at 120 ° C., using a filter with an absolute filtration accuracy of 2 ⁇ m Ink D was prepared by filtration.
- the ink supply system consists of an ink tank, a supply pipe, a front chamber ink tank immediately before the head, a pipe with a filter, and a recording head.
- the temperature from the front chamber tank to the recording head is insulated from the others and heated at 120 ° C. It was.
- the recording head was driven so as to eject 4 pl multi-size dots at a resolution of 1440 ⁇ 1440 dpi and continuously ejected with ink.
- the recording medium was subjected to the following process (described in Table 1), and then the energy density of 140 W / cm and illuminance of 20 mJ / cm from a high-pressure mercury lamp VZero085 (manufactured by INTEGRATION TECHNOLOGY).
- the ink was cured by irradiating with ultraviolet rays at 2 (integrated light amount) to prepare samples 101 to 117 as printed matter.
- ink A did not contain a polymerizable compound, it was not irradiated with ultraviolet rays.
- a cylindrical iron cylinder (upper roller) with a diameter of 30 mm ⁇ and a silicon rubber roller (lower roller) with a diameter of 30 mm ⁇ are both coated with a tetrafluoroethylene-perfluoroalkyl ether copolymer, and a heater is placed in the iron cylinder (upper roller). Is adjusted so that the surface temperature of the upper roller is 80 ° C., the conveyance speed is 10 mm / s, and the linear pressure is 8 ⁇ 10 ⁇ 5 Pa so that the upper roller is in contact with the image surface.
- the heat and pressure simultaneous processing in the heat and pressure simultaneous process was performed under the condition of a nip width of 4.3 mm.
- a non-contact type thermometer (IT-540N, manufactured by Horiba, Ltd.) was used for measuring the roller surface temperature.
- a line heater HYP-14N (output 980 W) manufactured by Hi-Beck Co., Ltd. was installed at a height of 5 cm from the recording medium, the heater output was adjusted so that the image surface temperature was 80 ° C., and irradiation was performed for 30 seconds.
- the image surface temperature was measured using a non-contact type thermometer (IT-540N, manufactured by Horiba, Ltd.).
- ⁇ Gloss uniformity> An image in which the printing density was continuously changed like a wedge was formed, and the gloss uniformity was visually evaluated. Evaluation was made according to the following criteria. A: A uniform gloss can be ensured over the entire density range. B: A slight gloss non-uniformity is observed in a part of the density range, but the acceptable quality C: the gloss is non-uniform due to the density. Unacceptable quality D: non-uniform gloss over the entire concentration range ⁇ Rubbing resistance evaluation> After printing a solid image on art paper, scratch strength was measured using a scratch strength tester HEIDON-18 (manufactured by HEIDON) and a 0.8 mm R sapphire needle.
- Scratch strength is 250 g or more
- B Scratch strength is 200 g or more
- C Scratch strength is 150 g or more and less than 200 g
- D Scratch strength is 100 g or more and less than 150 g
- E Scratch strength is less than 100 g ⁇ Liquid evaluation>
- the sample 103 subjected to heating pressure after printing the gloss is somewhat improved and the abrasion resistance is also improved due to the dot smoothing.
- the sample 104 subjected to the same treatment has a small amount of gelling agent contained in the ink after landing and gelation, and the gel strength is low. It can be estimated that (offset) reduces the smoothness of the printed portion and also reduces the abrasion resistance.
- the temperature of the ink dots is increased by applying warm air with a dryer, but at the same time, the molten dots are blown by the wind, so that the shape is disturbed and the liquid is generated.
- samples 107, 108, and 110 to 117 were subjected to a treatment for imparting electromagnetic waves using cation UV and radical UV, indicating that the effects of the present invention were obtained.
- the samples 110 to 112, 116, and 117 that irradiate far infrared rays have a higher effect of the invention. This is thought to be because the far-infrared rays enter the inside of the object to be heated and heat from the inside, thereby heating the ink dots uniformly and improving the smoothness while maintaining the shape of the dots.
- the effect is not as high as that of far-infrared rays, the same effect can be confirmed by heating the heaters of the samples 107 and 108 and the microwaves of the samples 113 to 114.
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Abstract
Description
吐出工程では、重合性化合物、光重合開始剤およびゲル化剤を含有する活性エネルギー線硬化型インクジェットインクの液滴を、インクジェットヘッドから射出することにより記録媒体上に供給する。
(重合性化合物)
本発明に係る重合性化合物は、本発明に係る光重合開始剤により重合し得る化合物であり、ラジカル重合性化合物、カチオン重合性化合物の何れも選択することができる。
エポキシ化合物としては、通常、エポキシ樹脂として用いられるモノマー、オリゴマーまたはポリマーの何れも使用可能である。具体的には、従来公知の芳香族エポキシド、脂環族エポキシドおよび脂肪族エポキシドが挙げられる。尚、以下、エポキシドとは、モノマーまたはそのオリゴマーを意味する。これらの化合物は1種または必要に応じて2種以上用いてもよい。
オキセタン化合物は、分子内に1以上のオキセタン(トリメチレンオキシド)環を有する化合物である。具体的には3-エチル-3-ヒドロキシメチルオキセタン(東亞合成社製:OXT101等)、1,4-ビス[(3-エチル-3-オキセタニル)メトキシメチル]ベンゼン(同OXT121等)、3-エチル-3-(フェノキシメチル)オキセタン(同OXT211等)、ジ(1-エチル-3-オキセタニル)メチルエーテル(同OXT221等)、3-エチル-3-(2-エチルヘキシロキシメチル)オキセタン(同OXT212等)、ジ(1-メチル-3-オキセタニル)メチルエーテル等を好ましく用いることができ、特に3-エチル-3-ヒドロキシメチルオキセタン、3-エチル-3-(フェノキシメチル)オキセタン、ジ(1-エチル-3-オキセタニル)メチルエーテルが好ましい。これらは単独で、あるいは2種以上を組み合わせて用いることができる。
ビニルエーテル化合物とは、ビニルエーテル基を有する有機化合物を指し、好ましくは分子量100から2000までの化合物である。上記分子量の範囲ならば、耐擦性に優れ、重合基の密度がよく、重合基と重合基の距離が十分に離れているために、高速で柔軟性のよい画像をインクジェット方式を用いて形成することが出来る。具体的には、以下の化合物を好適に用いることが出来る。
ブチルビニルエーテル、ヘキシルビニルエーテル、エチルヘキシルビニルエーテル、フェニルビニルエーテル、ベンジルビニルエーテル、エチルエトキシビニルエーテル、アセチルエトキシエトキシビニルエーテル、シクロヘキシルビニルエーテル、アダマンチルビニルエーテル
(2価のビニルエーテル)
エチレングリコールジビニルエーテル、ジエチレングリコールジビニルエーテル、トリエチレングリコールジビニルエーテル、プロピレングリコールジビニルエーテル、ジプロピレングリコールビニルエーテル、ブチレンジビニルエーテル、ジブチレングリコールジビニルエーテル、ネオペンチルグリコールジビニルエーテル、シクロヘキサンジオールジビニルエーテル、シクロヘキサンジメタノールジビニルエーテル、ノルボルニルジメタノールジビニルエーテル、イソバイニルジビニルエーテル、ジビニルレゾルシン、ジビニルハイドロキノン
(3価のビニルエーテル)
グリセリントリビニルエーテル、グリセリンエチレンオキシド付加物トリビニルエーテル(エチレンオキシドの付加モル数6)、トリメチロールプロパントリビニルエーテル、トリビニルエーテルエチレンオキシド付加物トリビニルエーテル(エチレンオキシドの付加モル数3)(テトラビニルエーテル)、ペンタエリスリトールトリビニルエーテル、ペンタエリスリトールエチレンオキシド付加物トリビニルエーテル(エチレンオキシドの付加モル数9)
(6価のビニルエーテル)
ジトリメチロールプロパンヘキサビニルエーテル、ジトリメチロールプロパンエチレンオキシド付加物ヘキサビニルエーテル(エチレンオキシドの付加モル数6)
上記ビニルエーテルのうち、特に好ましくは、2価以上のビニルエーテルである。2価以上のビニルエーテルを用いると、酸による重合反応が速やかに起こり、活性エネルギー線硬化感度が高くより好ましい。
本発明に係る重合開始剤は、活性エネルギー線の照射により重合性化合物の重合を開始し得るものであり、ラジカル重合開始剤、光酸発生剤などを用いることができる。
本発明に係るゲル化剤は、インクジェットインクを可逆にゲル化させることができる化合物である。
1,2,3,12,13,14,16,17,73,74,75,81,83,87,93,95,97,98,109,114,120,128,129,138,150,151,154,155,180,185,213
C.I.Pigment Red
5,7,12,22,38,48:1,48:2,48:4,49:1,53:1,57:1,63:1,101,112,122,123,144,146,168,184,185,202
C.I.Pigment Violet
19,23
C.I.Pigment Blue
1,2,3,15:1,15:2,15:3,15:4,18,22,27,29,60C.I.Pigment Green
7,36
C.I.Pigment White
6,18,21
C.I.Pigment Black 7
上記顔料の分散には、たとえば、ボールミル、サンドミル、アトライター、ロールミル、アジテータ、ヘンシェルミキサ、コロイドミル、超音波ホモジナイザー、パールミル、湿式ジェットミル、ペイントシェーカー等を用いることができる。また、顔料の分散を行う際に、分散剤を添加することも可能である。分散剤としては、高分子分散剤を用いることが好ましく、高分子分散剤としてはAvecia社のSolsperseシリーズや、味の素ファインテクノ社のPBシリーズが挙げられる。
本発明に用いられる記録媒体としては、たとえばポリエステル、ポリ塩化ビニル、ポリエチレン、ポリウレタン、ポリプロピレン、アクリル樹脂、ポリカーボネート、ポリスチレン、アクリロニトリル-ブタジエン-スチレン共重合体、ポリエチレンテレフタレート、ポリブタジエンテレフタレート等の樹脂およびこれらの樹脂からなるフィルム、これらの樹脂をその表面に有する基材、金属類、ガラス、印刷用紙が挙げられる。
吐出工程では、本発明に係る上記の活性エネルギー線硬化型インクジェットインクの液滴を、インクジェット記録ヘッドから射出して、記録媒体に供給して画像形成を行う。
活性エネルギー線照射工程では、記録媒体上に吐出されたインクジェットインクに、活性エネルギー線の照射を行い画像を形成する。
活性エネルギー線の照射条件としては、記録媒体上にインクが着弾した後であって、下述する工程(A)での電磁波の付与の後、0.001~1.0秒の間に活性光線が照射されることが好ましく、より好ましくは0.001~0.5秒である。高精細な画像を形成するためには、照射タイミングができるだけ早いことが好ましい。
活性エネルギー線の照射方法としては、下記の方法を用いることができる。たとえば、特開昭60-132767号に開示されている方法がある。これは、ヘッドユニットの両側に光源を設け、シャトル方式でヘッドと光源を走査する方法である。照射は、インク着弾後、一定時間を置いて行われることになる。
工程(A)は、上記活性エネルギー線照射工程の前の工程であり、インクジェットインク中に含有される光重合開始剤の吸収波長の波長よりも長い波長を有する電磁波を、画像を形成する面側から、記録媒体に付与する。
赤外線はその波長から、近赤外線と遠赤外線に分類される。
波長100μm~1mの電磁波を指し、物質内の荷電粒子や電気双極子が、マイクロ波による振動電磁場の影響で、回転または振動するために加熱が可能となる。
色材:C.I.ピグメントブルー15:3(平均粒径;100nm)
5質量部
パラフィンワックス(日本精蝋社製、155) 45質量部
ベヘン酸(和光純薬社製) 30質量部
オレイン酸アミド(花王社製、脂肪酸アマイドON) 20質量部
上記各添加物を順次混合し、150℃に加熱して攪拌した後、得られた液体を加熱下、フィルターでろ過し、冷却してインクAを調製した。
〈シアン顔料分散物1の調製〉
C.I.ピグメントブルー15:3 20質量部
PB822(味の素ファインテクノ社製分散剤) 8質量部
オキセタン(OXT221、東亞合成社製) 72質量部
上記各物質を混合した後、顔料粒子の平均粒径が0.2~0.3μmの範囲となるように、公知の分散装置を用い、分散条件を適宜調整して分散を行い、次いで加熱下でフィルター濾過を行ってシアン顔料分散物1を調製した。
シアン顔料分散物1 20質量部
重合性化合物1:脂環式エポキシ化合物(CEL2021P、ダイセル化学社製) 15質量部
重合性化合物2:オキセタン(OXT221、東亞合成社製)
51.5質量部
ステアロン (Alfa Aesar社製) 10質量部
光重合開始剤1:ヨードニウム塩(IBPF、三和ケミカル製)
2.5質量部
チオキサントン(DETX、日本化薬製) 1.0質量部
上記各物質を順次添加して、混合した後、絶対ろ過精度2μmのフィルターを用いてろ過して、インクBを調製した。
〈シアン顔料分散物2の調製〉
C.I.ピグメントブルー15:3 20質量部
高分子分散剤(Zeneca社製 Solsperseシリーズ)
5質量部
ステアリルアクリレート 75質量部
上記各物質を混合した後、顔料粒子の平均粒径が0.2~0.3μmの範囲となるように、公知の分散装置を用い、分散条件を適宜調整して分散を行い、次いで加熱下でフィルター濾過を行ってシアン顔料分散物2を調製した。
シアン顔料分散物2 20質量部
光重合性化合物1:ラウリルアクリレート(単官能) 10質量部
光重合性化合物2:エチレンオキサイド変性トリメチロールプロパントリアクリレート(三官能) 10質量部
光重合性化合物3:カプロラクタム変性ジペンタエリスリトールヘキサアクリレート(六官能) 20質量部
光重合性化合物4:テトラエチレングリコールジアクリレート(二官能)
25質量部
ステアロン (Alfa Aesar社製) 10質量部
重合開始剤1:イルガキュア184(BASFジャパン社製)
2.5質量部
重合開始剤2:イルガキュア907(BASFジャパン社製)
2.5質量部
上記各物質を順次添加、100℃で混合した後、絶対ろ過精度2μmのフィルターを用いてろ過して、インクCを調製した。
(顔料分散液3の調製)
C.I.ピグメントブルー15:3 20質量部
PB822(味の素ファインテクノ社製分散剤) 8質量部
シクロヘキサンジビニルエーテル(CHDVE 日本カーバイド工業株式会社製) 72質量部
室温まで冷却した後、これに下記顔料の20部を加えて、直径0.5mmのジルコニアビーズ200gと共にガラス瓶に入れ密栓し、ペイントシェーカーにて10時間で分散処理した後、ジルコニアビーズを除去し、シアン顔料分散液である顔料分散液3を調製した。
顔料分散液3 20質量部
シクロヘキサンジビニルエーテル(CHDVE 日本カーバイド工業株式会社製) 43質量部
ビニルエーテルオリゴマー(Vectomer 2020 Aldrich社製) 20質量部
ステアロン (Alfa Aesar社製) 10質量部
TEMPO(2,2,6,6-テトラメチルピペリジン 1-オキシル)
0.03質量部
CPI-100P:トリアリルスルホニウム塩のプロピレンカーボネート50%溶液(サンアプロ社製) 2質量部
上記各物質を順次添加、120℃で混合した後、絶対ろ過精度2μmのフィルターを用いてろ過して、インクDを調製した。
シアン顔料分散物2 20質量部
光重合性化合物1:ラウリルアクリレート(単官能) 10質量部
光重合性化合物2:エチレンオキサイド変性トリメチロールプロパントリアクリレート(三官能) 10質量部
光重合性化合物3:カプロラクタム変性ジペンタエリスリトールヘキサアクリレート(六官能) 25質量部
光重合性化合物4:テトラエチレングリコールジアクリレート(二官能)
25質量部
ステアロン 3質量部
マイクロクリスタリンワックス 2質量部
重合開始剤1:イルガキュア184(BASFジャパン社製)
2.5質量部
重合開始剤2:イルガキュア907(BASFジャパン社製)
2.5質量部
上記各物質を順次添加、100℃で混合した後、絶対ろ過精度2μmのフィルターを用いてろ過して、インクEを調製した。
シアン顔料分散物2 20質量部
光重合性化合物1:ラウリルアクリレート(単官能) 10質量部
光重合性化合物2:エチレンオキサイド変性トリメチロールプロパントリアクリレート(三官能) 12質量部
光重合性化合物3:カプロラクタム変性ジペンタエリスリトールヘキサアクリレート(六官能) 25質量部
光重合性化合物4:テトラエチレングリコールジアクリレート(二官能)
25質量部
ベヘニン酸ベヘニル 3質量部
重合開始剤1:イルガキュア184(BASFジャパン社製)
2.5質量部
重合開始剤2:イルガキュア907(BASFジャパン社製)
2.5質量部
上記各物質を順次添加、100℃で混合した後、絶対ろ過精度2μmのフィルターを用いてろ過して、インクFを調製した。
ピエゾ型ヘッドを備え、ラインヘッド方式のインクジェット記録装置に上記調製した各インクを装填し、記録媒体としてアート紙(三菱製紙社製 特菱アート両面N)を用いて単色ベタ、楔様画像を印刷した。
直径30mmφの円柱状の鉄シリンダ(上ローラ)と、直径30mmφのシリコンゴムローラ(下ローラ)が共に、テトラフルオロエチレン-パーフルオロアルキルエーテル共重合体により被覆され、鉄シリンダ(上ローラ)内にヒータを内蔵されている定着装置を用いて、上ローラの表面温度を80℃なるように調整し、上ローラが画像表面に接するように、搬送速度10mm/s、線圧が8×10-5Pa、ニップ幅4.3mmの条件で加熱加圧同時工程の加熱加圧同時の処理を行った。尚、ローラの表面温度測定には非接触式の温度計(IT-540N 堀場製作所製)を用いた。
上記プリンタにて印字後に印刷物画像表面に対して、出力1kWのドライヤーを用いて、画像表面温度が80℃になるように記録媒体からの距離を調整し、30秒間送風した。尚、画像表面の温度は非接触式の温度計(IT-540N、堀場製作所製)を用いて測定した。
株式会社ハイベック社製ラインヒーター HYP-14N(出力980W)を記録媒体から5cmの高さに設置し、画像表面温度が80℃になるようにヒータ出力を調整し、30秒間照射した。尚、画像表面の温度は非接触式の温度計(IT-540N 堀場製作所製)を用いて測定した。
株式会社ノリタケカンパニーリミテド社製 遠赤外線セラミックプレートヒータ PLR-120(1kW)を印字後の記録媒体から5cmの高さに設置し、画像表面温度が80℃になるようにヒータ出力を調整し、30秒間照射した。尚、画像表面の温度は非接触式の温度計(IT-540N 堀場製作所製)を用いて測定した。
印刷後の試料を取り出し、出力1kWの電子レンジで30秒マイクロ波を照射した。
上記調製した各インクについて、下記の方法に従って印刷物試料の作製および評価を行った。
楔様に印刷濃度を連続的に変化させた画像を形成し、その光沢均一性を目視評価した。以下の基準に則り評価した。
A:全濃度領域に渡り均一な光沢が確保できている
B:一部の濃度領域において軽微な光沢不均一性がみられるが、許容内の品質
C:濃度による光沢の不均一性があり、許容できない品質
D:全濃度領域にわたり、光沢が不均一
<耐擦性評価>
アート紙上にベタ画像を印字した後に、スクラッチ強度試験機HEIDON-18(HEIDON社製)を用い、測定針は0.8mmRのサファイヤ針を用いてスクラッチ強度の測定を実施。測定は一定荷重で10cm引っかき試験を3回行い、記録媒体まだ傷が入った箇所が存在しない限界荷重をスクラッチ強度と定義し、その測定値より下記基準で耐擦性を評価した。
A:スクラッチ強度が250g以上である
B:スクラッチ強度が200g以上である
C:スクラッチ強度が150g以上200g未満である
D:スクラッチ強度が100g以上150g未満である
E:スクラッチ強度が100g未満である
<液寄り評価>
アート紙上にベタ画像を印字した後に、液寄りの状況を目視観察し、画像濃度均一性の指標とした。
A:濃度ムラが全くみられない
B:わずかに濃度ムラがみられるが、許容レベル
C:濃度ムラが発生し、品質上問題となるレベル
D:濃度ムラが大きく発生
表1の結果によると、ホットメルトインクを用い、印字後のプロセスを全く施さない試料101は光沢の均一性、耐擦性に劣ることが分かる。これはホットメルトインクがWaxを主成分としており、転写媒体を活用しないと光沢発現しないことに起因し低光沢となっている。また、着弾したドットがそのまま温度低下によりゲル化するため、外部からの応力によってドットが脱離してしまい耐擦性が低下している。これに対して、インクをカチオンUVインクに変更することにより、光沢はやや改善するものの、耐擦性は依然して低いままである。
Claims (4)
- 重合性化合物、光重合開始剤およびゲル化剤を含有する活性エネルギー線硬化型インクジェットインクの液滴を、インクジェット記録ヘッドから射出することにより記録媒体上に供給する吐出工程、および該記録媒体上に吐出されたインクジェットインクに活性エネルギー線の照射を行い画像を形成する活性エネルギー線照射工程を有する印刷物製造方法であって、該活性エネルギー線照射工程の前に、該インクジェットインク中に含有される光重合開始剤の吸収波長の波長よりも長い波長を有する電磁波を、画像を形成する面側から、該記録媒体に付与する工程(A)を有することを特徴とする印刷物製造方法。
- 前記工程(A)が、前記吐出工程の後であることを特徴とする請求項1に記載の印刷物製造方法。
- 前記電磁波が、遠赤外線であることを特徴とする請求項1または2に記載の印刷物製造方法。
- 前記ゲル化剤が、融点が40℃から100℃である、脂肪酸エステルまたはケトンワックスであることを特徴とする請求項1から3のいずれか1項に記載の印刷物製造方法。
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JP2013215923A (ja) * | 2012-04-05 | 2013-10-24 | Konica Minolta Inc | 活性光線硬化型インクジェットインク、及びこれを用いた画像形成方法 |
JP2014220510A (ja) * | 2012-02-29 | 2014-11-20 | 日立化成株式会社 | n型拡散層形成組成物、n型拡散層の製造方法、及び太陽電池セルの製造方法 |
WO2014196213A1 (ja) * | 2013-06-07 | 2014-12-11 | コニカミノルタ株式会社 | 活性光線硬化型インクジェットインクおよびそれを用いた画像形成方法 |
EP2824149A4 (en) * | 2012-03-09 | 2015-08-05 | Fujifilm Corp | RADIATION-CURABLE INKJET INK ASSEMBLY AND INKJET PRINTING METHOD |
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JP2018506594A (ja) * | 2014-12-18 | 2018-03-08 | オセ−テクノロジーズ ビーブイ | インク組成物 |
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US20130010040A1 (en) * | 2010-03-31 | 2013-01-10 | Konica Minolta Holdings, Inc. | Inkjet ink and method for forming inkjet image |
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JP2006056199A (ja) * | 2004-08-23 | 2006-03-02 | Hamada Printing Press Co Ltd | インクジェット記録方法および装置 |
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JP2003145914A (ja) * | 2001-11-07 | 2003-05-21 | Konica Corp | インクジェット記録方法およびインクジェット記録装置 |
GB0322485D0 (en) * | 2003-09-25 | 2003-10-29 | Disperse Ltd | Process for the preparation of surface coatings or dry films |
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JP5105757B2 (ja) * | 2006-03-15 | 2012-12-26 | 富士フイルム株式会社 | インクジェット記録用インクセット及びインクジェット記録方法 |
JP2010115791A (ja) * | 2008-11-11 | 2010-05-27 | Konica Minolta Ij Technologies Inc | 画像形成装置 |
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Also Published As
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US8733922B2 (en) | 2014-05-27 |
EP2565044A4 (en) | 2015-10-21 |
US20130038668A1 (en) | 2013-02-14 |
EP2565044B1 (en) | 2017-07-12 |
JP5594360B2 (ja) | 2014-09-24 |
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JPWO2011136009A1 (ja) | 2013-07-18 |
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