WO2022210076A1 - プレコート剤、インクジェット記録用インクセット、及び、積層体 - Google Patents
プレコート剤、インクジェット記録用インクセット、及び、積層体 Download PDFInfo
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- WO2022210076A1 WO2022210076A1 PCT/JP2022/013063 JP2022013063W WO2022210076A1 WO 2022210076 A1 WO2022210076 A1 WO 2022210076A1 JP 2022013063 W JP2022013063 W JP 2022013063W WO 2022210076 A1 WO2022210076 A1 WO 2022210076A1
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- 230000007704 transition Effects 0.000 description 1
- ZIBGPFATKBEMQZ-UHFFFAOYSA-N triethylene glycol Chemical compound OCCOCCOCCO ZIBGPFATKBEMQZ-UHFFFAOYSA-N 0.000 description 1
- HRXKRNGNAMMEHJ-UHFFFAOYSA-K trisodium citrate Chemical compound [Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O HRXKRNGNAMMEHJ-UHFFFAOYSA-K 0.000 description 1
- 229940038773 trisodium citrate Drugs 0.000 description 1
- 235000013799 ultramarine blue Nutrition 0.000 description 1
- NQPDZGIKBAWPEJ-UHFFFAOYSA-N valeric acid Chemical compound CCCCC(O)=O NQPDZGIKBAWPEJ-UHFFFAOYSA-N 0.000 description 1
- 239000000080 wetting agent Substances 0.000 description 1
- 239000004711 α-olefin Substances 0.000 description 1
- PAPBSGBWRJIAAV-UHFFFAOYSA-N ε-Caprolactone Chemical compound O=C1CCCCCO1 PAPBSGBWRJIAAV-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/30—Inkjet printing inks
- C09D11/32—Inkjet printing inks characterised by colouring agents
- C09D11/322—Pigment inks
-
- 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
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/02—Emulsion paints including aerosols
- C09D5/024—Emulsion paints including aerosols characterised by the additives
-
- 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
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
-
- 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
- C09D7/60—Additives non-macromolecular
- C09D7/63—Additives non-macromolecular organic
-
- 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
- C09D7/66—Additives characterised by particle size
- C09D7/69—Particle size larger than 1000 nm
-
- 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
- B41M5/0011—Pre-treatment or treatment during printing of the recording material, e.g. heating, irradiating
- B41M5/0017—Application of ink-fixing material, e.g. mordant, precipitating agent, on the substrate prior to printing, e.g. by ink-jet printing, coating or spraying
Definitions
- the present invention relates to a precoating agent, an ink set for inkjet recording, and a laminate.
- An image forming method in which a pre-coating agent (pretreatment liquid) is applied or ejected onto the surface of a substrate, and then an ink composition for inkjet recording is ejected to aggregate the pigment on the substrate to achieve high image quality. ing.
- pre-coating agent pretreatment liquid
- ink composition for inkjet recording is ejected to aggregate the pigment on the substrate to achieve high image quality.
- Patent Document 1 a pretreatment step in which a pretreatment liquid is applied onto a recording medium having a coating layer on a support, and a colorant, a water-soluble organic solvent, a colorant, a water-soluble organic solvent, An image forming step in which an inkjet ink containing a surfactant, a penetrating agent, and water is applied to form an image, and a post-treatment liquid is applied to the surface to which the inkjet ink is applied to form a protective layer.
- the transfer amount of pure water to the coating layer of the recording medium at a contact time of 100 ms measured by a dynamic scanning liquid absorption meter is 1 to 10 mL/m 2
- at least one of the pretreatment liquid and the posttreatment liquid contains water and an aqueous resin, and further contains colloidal silica, barium sulfate, or titanium oxide.
- the ink-receiving layer contains inorganic fine particles, cationic organic fine particles and a water-soluble polyvalent metal salt
- a recording medium characterized in that the cationic organic fine particles are contained in an ink-receiving layer containing the cationic organic fine particles in an amount of 0.1 to 25% by mass relative to the dry mass of the ink-receiving layer.
- the present invention has been made in view of the above-described problems, and provides a method of suppressing motting and bleeding when printing an ink composition for inkjet recording without using a polyvalent metal salt, thereby improving the print image quality.
- a precoat agent used for forming a precoat layer for receiving an ink composition for inkjet recording includes inorganic particles having a specific particle size, organic
- a precoating agent containing an amine salt of an acid, a resin emulsion and water can solve all of the above problems without using a polyvalent metal salt, and have completed the present invention.
- the present invention provides a precoating agent used for forming a precoating layer for receiving an ink composition for inkjet recording, comprising inorganic particles, an amine salt of an organic acid, a resin emulsion and water, It is a precoating agent having a particle size of 1 ⁇ m to 10 ⁇ m and containing no polyvalent metal salt.
- the inorganic particles are preferably porous silica particles.
- the amine salt of the organic acid is polyacrylic acid, formic acid, acetic acid, glycolic acid, malonic acid, malic acid, maleic acid, succinic acid, glutaric acid, fumaric acid, citric acid, tartaric acid, and lactic acid, or A salt obtained by neutralizing at least one selected from these derivatives with an amine is preferred.
- the resin emulsion is preferably a styrene-acrylic emulsion and/or a vinyl acetate emulsion.
- the present invention also provides an ink set for inkjet recording comprising the precoating agent and an ink composition for inkjet recording.
- the ink composition for inkjet recording is preferably a water-based ink composition for inkjet recording.
- the ink composition for water-based inkjet recording preferably contains a pigment coated with an alkali-soluble resin, a basic compound, and a water-soluble organic solvent.
- the present invention also provides a laminate having, on a base material, a printed layer formed by the ink set for inkjet recording and an overcoat layer containing a resin in this order.
- the present invention provides a precoat agent used for forming a precoat layer that receives an ink composition for inkjet recording, the precoat agent comprising inorganic particles, an amine salt of an organic acid, a resin emulsion, and water, wherein the particle diameter of the inorganic particles is is 1 ⁇ m to 10 ⁇ m, and the precoating agent does not contain a polyvalent metal salt.
- the inorganic particles having a specific particle size prevent excessive penetration and strike-through into the substrate described below after droplets of the ink composition for inkjet recording flying from the inkjet nozzle land on the substrate.
- the organic acid obtained by drying the amine salt of the organic acid reacts with the compound contained in the ink composition for inkjet recording, thereby suppressing motting and bleeding and improving the printing image quality.
- the resin emulsion provides a precoat layer capable of preventing the inorganic particles and the amine salt of the organic acid from peeling off from the substrate.
- the present invention need not be construed as being limited to the above mechanism.
- the precoating agent of the present invention contains inorganic particles.
- the inorganic particles include at least one selected from titanium dioxide, silica, alumina, iron oxide, iron hydroxide, tin oxide, and the like.
- the inorganic particles are preferably porous particles, more preferably porous silica particles.
- the above inorganic particles can be used alone or in combination of two or more.
- the inorganic particles have a particle size of 1 ⁇ m to 10 ⁇ m. If the particle size of the inorganic particles is less than 1 ⁇ m, the effect of suppressing strike-through is reduced, and if it exceeds 10 ⁇ m, the smoothness of the coating film formed by the precoating agent is reduced, resulting in deterioration in print image quality. . More preferably, the inorganic particles have a particle size of 3 ⁇ m to 7 ⁇ m.
- the particle size means the volume average particle size measured by a particle size distribution analyzer based on the principle of laser diffraction scattering.
- the average pore diameter is preferably 10 nm or more and 300 nm, and preferably 10 nm or more and 200 nm or less.
- the average pore diameter in the present invention refers to the average pore diameter calculated from the pore volume and the specific surface area.
- the pore volume is preferably 10 mL/g to 200 mL/g, more preferably 30 mL/g to 100 mL/g.
- the pore volume and specific surface area can be calculated based on the pore distribution obtained by the gas adsorption method (using nitrogen gas). Specifically, the BJH method is used for the total pore volume, and the BET method for the specific surface area. can be calculated using As an apparatus capable of performing the gas adsorption method, for example, Autosorb 3 (product name) manufactured by Quantachrome Co., Ltd., and the like can be mentioned.
- the porosity is not particularly limited. is more preferred.
- the porosity can be calculated based on the pore volume.
- the content of the inorganic particles is preferably 1 to 10% by mass, more preferably 3 to 7% by mass, based on the total mass of the precoating agent.
- the precoating agent of the present invention contains an amine salt of an organic acid.
- An amine salt of an organic acid means a salt obtained by neutralizing an organic acid with an amine.
- organic acid examples include polyacrylic acid, formic acid, acetic acid, glycolic acid, malonic acid, malic acid, maleic acid, succinic acid, glutaric acid, fumaric acid, citric acid, tartaric acid, and lactic acid, or derivatives thereof. At least one selected is included. Among them, a water-soluble organic acid is preferable, and a water-soluble polyvalent carboxylic acid is more preferable, from the viewpoint of suppressing uneven coating of the precoat agent and suitably exhibiting the effects of the present invention. , citric acid and malic acid are more preferred.
- the amine is preferably a volatile amine, such as ammonia, mono- or di- or trialkyl (1 to 4 carbon atoms) amine, monoalkanol (2 or 3 carbon atoms) amine, mono- or dialkyl ( Examples thereof include monoalkanol (having 2 or 3 carbon atoms) amines having 1 to 4 carbon atoms.
- a volatile amine such as ammonia, mono- or di- or trialkyl (1 to 4 carbon atoms) amine, monoalkanol (2 or 3 carbon atoms) amine, mono- or dialkyl ( Examples thereof include monoalkanol (having 2 or 3 carbon atoms) amines having 1 to 4 carbon atoms.
- ammonia mono- or di- or trialkyl (C 1-4) amines such as methylamine, dimethylamine, trimethylamine, ethylamine, triethylamine, propylamine, butylamine; monoethanolamine, monopropanolamine and the like
- mono- or dialkyl (C1-4) monoalkanolamines such as monoalkanolamine and dimethylaminoethanol can be used.
- ammonia is preferable from the viewpoint of suitably imparting cohesiveness to the coating film of the precoating agent and from the viewpoint of being less likely to remain on the substrate, which will be described later.
- the amine salt of the organic acid may be used alone or in combination of two or more.
- the content of the amine salt of the organic acid is preferably 1 to 10% by mass, more preferably 3 to 7% by mass, based on the total mass of the precoating agent.
- the precoating agent of the present invention contains a resin emulsion.
- the resin emulsion examples include emulsions of acrylic resins, ester resins, urethane resins, vinyl acetate resins, vinyl chloride resins, styrene resins, butadiene resins, and styrene acrylic resins.
- styrene-acrylic emulsion and/or vinyl acetate emulsion are preferable from the viewpoint of excellent cohesiveness of the coating film of the precoating agent and suitable imparting of coating film resistance.
- the above resin emulsions can be used alone or in combination of two or more.
- the resin emulsion preferably has a glass transition temperature of 30° C. or lower, more preferably 20° C. or lower.
- the glass transition temperature of the resin emulsion can be determined, for example, by differential scanning calorimetry (DSC) conforming to JIS K 7121:2012 "Method for measuring transition temperature of plastics".
- DSC differential scanning calorimetry
- the content of the resin emulsion is preferably 0.1 to 10% by mass, more preferably 0.5 to 5% by mass, based on the total mass of the precoating agent.
- Examples of the resin emulsion include those obtained by emulsifying the resins exemplified above in an aqueous medium described below using a low-molecular-weight emulsifier, those emulsified in an aqueous medium described below using a high-molecular-weight emulsifier, and by self-emulsification. Examples thereof include those emulsified in an aqueous medium, which will be described later.
- low-molecular-weight emulsifier examples include monosaccharide or polysaccharide fatty acid ester, polyglycerin fatty acid ester, organic acid monoglyceride, propylene glycol fatty acid ester, polyglycerin condensed ricinoleic acid ester, sorbitan fatty acid ester, polyoxyethylene sorbitan fatty acid ester, polyoxy Ethylene alkyl ether, alkylbenzene sulfonate, alkanesulfonate, ⁇ -olefin sulfonate, polyoxyethylene alkyl ether sulfate, alkyl sulfate, polyoxyethylene alkyl ether phosphate, alkyl phosphate, tetraalkylammonium salts, alkylbenzyldimethylammonium salts, fatty acid amidoamines, alkylpyridinium salts, alkylbetaines, and alkylamine oxides.
- the precoating agent of the present invention contains water. Commercially available purified water or the like can be used as the water.
- the water is preferably contained in an amount of 50 to 95% by mass based on the mass of the precoating agent. , more preferably 70 to 90% by mass.
- the content of water is the sum of the content of water contained in the resin emulsion and the content of water other than the aqueous medium contained in the resin emulsion.
- the precoating agent of the present invention preferably contains surfactants, thickeners and pH adjusters as necessary.
- the surfactant is added to impart leveling properties, and known surfactants can be appropriately selected and used as long as they do not impair the performance of the precoating agent of the present invention.
- the thickener is not particularly limited as long as it does not react with the organic acid, and a known nonionic or anionic thickener can be appropriately selected and used.
- pH adjuster a known pH adjuster can be appropriately selected and used, and ammonia is preferably exemplified from the viewpoint of volatility.
- the contents of the surfactant, the thickener, and the pH adjuster are, for example, 0.01 to 5% by mass with respect to the total mass of the precoating agent.
- additives such as dispersants, dispersing aids, wetting agents, antifoaming agents, antifungal agents, and anticorrosive agents are appropriately selected as necessary. can be used as dispersants, dispersing aids, wetting agents, antifoaming agents, antifungal agents, and anticorrosive agents.
- the precoating agent of the present invention does not contain a polyvalent metal salt from the viewpoint of suppressing peeling of the overcoat layer and reduction in hardness, which will be described later.
- the polyvalent metal salt is composed of polyvalent metal ions having a valence of 2 or more and anions that bind to these polyvalent metal ions, and is soluble in water.
- polyvalent metal ions include Ca 2+ , Cu 2+ , Ni 2+ , Mg 2+ , Zn 2+ , Ba 2+ , etc.
- anions include Cl ⁇ , NO 3 ⁇ , I ⁇ , Br ⁇ , ClO 3 ⁇ , and the like.
- the method for producing the precoating agent of the present invention is not particularly limited.
- the precoating agent can be produced by adding additives and the like to the respective components described above, if necessary, and kneading them.
- the precoating agent of the present invention preferably has a viscosity of 10 to 40 seconds, more preferably 15 to 25 seconds, as measured by Zahn Cup No. 3 (manufactured by Rigosha). preferable.
- the precoating agent of the present invention preferably has a pH of 7 to 9 from the viewpoint of miscibility of materials and storage stability.
- the ink set for inkjet recording of the present invention includes the precoating agent of the present invention and an ink composition for inkjet recording.
- the ink composition for inkjet recording will be described below.
- the ink set for inkjet recording of the present invention includes an ink composition for inkjet recording.
- the ink composition for inkjet recording is preferably an ink composition for aqueous inkjet recording.
- the ink composition for water-based inkjet recording preferably contains a pigment coated with an alkali-soluble resin, a basic compound, and a water-soluble organic solvent.
- pigment examples include various inorganic pigments and organic pigments generally used in inkjet inks.
- the inorganic pigments include colored pigments such as titanium oxide, red iron oxide, antimony red, cadmium yellow, cobalt blue, ultramarine blue, Prussian blue, carbon black, and graphite (including achromatic colored pigments such as white and black), and carbonic acid.
- Extender pigments such as calcium, kaolin, clay, barium sulfate, aluminum hydroxide and talc can be mentioned.
- organic pigment examples include soluble azo pigments, insoluble azo pigments, azo lake pigments, condensed azo pigments, copper phthalocyanine pigments, and condensed polycyclic pigments. These may be used alone or in combination of two or more.
- alkali-soluble resin As the alkali-soluble resin for coating the pigment, an alkali-soluble resin satisfying the following (a) to (c) can be used.
- the acid value of the alkali-soluble resin is 40-300 mgKOH/g.
- 50 to 90% of the acid groups of the alkali-soluble resin are neutralized with a basic compound;
- it contains a styrenic monomer.
- alkali-soluble resin examples include, for example, a monomer having a carboxyl group as a structural unit, and a monomer having lauryl (meth)acrylate and an aromatic ring in order to improve adsorptivity with pigments. or copolymers obtained by reacting these monomers with other polymerizable monomers as necessary.
- Examples of monomers having a carboxyl group include acrylic acid, methacrylic acid, crotonic acid, itaconic acid, maleic acid, fumaric acid, 2-carboxyethyl (meth)acrylate, 2-carboxypropyl (meth)acrylate, anhydrous Maleic acid, maleic acid monoalkyl ester, citraconic acid, citraconic anhydride, citraconic acid monoalkyl ester and the like.
- lauryl (meth) acrylate and as a monomer having an aromatic ring examples include monomers, benzyl (meth)acrylate, and the like.
- the styrene-based monomer refers to a compound having styrene as a basic skeleton and optionally having a substituent.
- the alkali-soluble resin preferably contains 30 to 60 mass % of a monomer having an aromatic ring, preferably a styrenic monomer.
- the alkali-soluble resin preferably contains 20 to 40% by mass of lauryl (meth)acrylate from the viewpoint of dispersion stability and hardening property.
- Stearyl (meth)acrylate may not be used, but stearyl (meth)acrylate may be used together with the use of lauryl (meth)acrylate to the extent that the effect of using lauryl (meth)acrylate is not impaired. is also possible.
- the acid value of the alkali-soluble resin is preferably 40-300 mgKOH/g, more preferably 70-250 mgKOH/g.
- the acid value of the alkali-soluble resin is lower than 40 mgKOH/g, the dispersion stability of the resulting aqueous dispersion of the pigment coated with the alkali-soluble resin may decrease. becomes too high, storage stability and water resistance may decrease.
- the acid groups of the alkali-soluble resin are neutralized with a basic compound. If the neutralization is less than 50%, the dispersion stability may deteriorate, and if it exceeds 90%, the storage stability and water resistance may deteriorate.
- the weight average molecular weight of the alkali-soluble resin is preferably 3,000 to 100,000, more preferably 10,000 to 50,000.
- the weight average molecular weight of the alkali-soluble resin is less than 3,000, the dispersion stability of the pigment and the abrasion resistance of the resulting printed layer tend to decrease. I don't like it.
- the acid value of the alkali-soluble resin is calculated based on the composition of the monomers used for synthesizing the alkali-soluble resin, and the number of mg of potassium hydroxide theoretically required to neutralize 1 g of the alkali-soluble resin. It is the theoretical acid value calculated theoretically.
- the weight average molecular weight of the alkali-soluble resin can be measured by a gel permeation chromatography (GPC) method.
- GPC gel permeation chromatography
- chromatography is performed using Waters 2690 (manufactured by Waters) as a GPC device and PLgel 5 ⁇ MIXED-D (manufactured by Polymer Laboratories) as a column, and the polystyrene equivalent weight average molecular weight can be obtained.
- Basic compounds that neutralize the acid groups of the alkali-soluble resin include inorganic basic compounds such as sodium hydroxide and potassium hydroxide, ammonia, methylamine, ethylamine, monoethanolamine, N,N-dimethylethanol. organic basic compounds such as amine, N,N-diethylethanolamine, N,N-dibutylethanolamine, diethanolamine, N-methyldiethanolamine, triethanolamine, morpholine, N-methylmorpholine, N-ethylmorpholine; be done. These basic compounds can be used alone or in combination of two or more.
- alkanolamines such as monoethanolamine, N,N-dimethylethanolamine, N,N-diethylethanolamine, N,N-dibutylethanolamine, diethanolamine, N-methyldiethanolamine, and triethanolamine are used from the viewpoint of pigment dispersion. preferred.
- the bifunctional or higher functional cross-linking agent used in the production of the coated pigment is used to appropriately cross-link the alkali-soluble resin.
- the cross-linking agent of the present invention is a cross-linking agent having two or more reactive functional groups, and the molecular weight of the cross-linking agent is in the range of 100 to 2,000 from the viewpoint of easiness of reaction and storage stability. is preferably
- the reactive functional group one or more selected from the group consisting of an epoxy group, a hydroxyl group, and an allydin group are preferable.
- an epoxy group is preferred from the viewpoint of viscosity and tolerance, and a bifunctional epoxy compound is more preferred.
- bifunctional or higher epoxy compounds include Epolite 40E, 100E, 200E, 400E, 70P, 200P, 400P, 1500NP, 1600, 80MF (manufactured by Kyoeisha Chemical Co., Ltd.), Denacol EX-201, EX- 211, EX-212, EX-313, EX-314, EX-321, EX-411, EX-421, EX-512, EX-521, EX-611, EX-612, EX-614, EX-614B, EX-622 (manufactured by Nagase ChemteX Corporation) and the like can be exemplified.
- the coated pigment is an insolubilized resin obtained by dissolving or dispersing an alkali-soluble resin in which an acid group is neutralized with a basic compound and a pigment in an aqueous solvent, and then salting out the alkali-soluble resin. and adhere to the surface of the pigment. 50-90% of the acid groups of the deposited insolubilized resin were neutralized.
- a dispersion is obtained in which the pigment coated with the alkali-soluble resin thus obtained is dispersed, a cross-linking agent is added to the dispersion, and the mixture is heated to cross-link the alkali-soluble resin covering the surface of the pigment. and insolubilized to produce a coated pigment.
- the resulting crosslinked alkali-soluble resin has a crosslinking rate of 10 to 90%, preferably 20 to 80%, more preferably 30 to 70%, more preferably 30 to 70%, with respect to the theoretical acid value of the alkali-soluble resin. 35-50%. If the cross-linking rate is less than 10, the coating strength to the pigment may not be sufficient, and if it exceeds 90%, the dispersion stability of the pigment may be impaired.
- the water-soluble organic solvent is used as an aqueous medium together with water.
- water deionized water or distilled water from which metal ions and the like have been removed is preferable.
- water-soluble organic solvent it may be possible to impart more excellent inkjet printability in terms of storage stability, ejection stability, ink flight properties, and the like.
- water-soluble organic solvents include monoalcohols, polyhydric alcohols, lower alkyl ethers of polyhydric alcohols, ketones, ethers, esters, and nitrogen-containing compounds. These may be used alone or in combination of two or more.
- monoalcohols include methanol, ethanol, n-propanol, n-butanol, n-pentanol, n-hexanol, n-heptanol, n-octanol, n-nonyl alcohol, n-decanol, or these isomers, cyclopentanol, cyclohexanol, etc., preferably alcohols having an alkyl group of 1 to 6 carbon atoms.
- polyhydric alcohols include ethylene glycol, propylene glycol, 1,3-butylene glycol, 1,4-butylene glycol, 1,2-pentanediol, 1,5-pentanediol, neopentyl glycol, 1 ,2-hexanediol, 1,6-hexanediol, 1,2-cyclohexanediol, heptanediol, 1,8-octanediol, 1,9-nonanediol, 1,10-decanediol, glycerin, pentaerythritol, diethylene glycol , dipropylene glycol, triethylene glycol, tetraethylene glycol, polyethylene glycol, polypropylene glycol, thiodiglycol and the like.
- lower alkyl ethers of polyhydric alcohols include ethylene glycol monomethyl ether, ethylene glycol dimethyl ether, ethylene glycol monoethyl ether, ethylene glycol diethyl ether, ethylene glycol monopropyl ether, ethylene glycol isopropyl ether, and ethylene glycol monobutyl ether.
- ethylene glycol isobutyl ether propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol monopropyl ether, propylene glycol monobutyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, dipropylene glycol mono-n-propyl ether, dipropylene glycol mono-n-butyl ether and the like.
- Specific examples of the ketones include acetone, methyl ethyl ketone, methyl butyl ketone, methyl isobutyl ketone, diisopropyl ketone, cyclopentanone, cyclohexanone and the like.
- ethers include isopropyl ether, n-butyl ether, tetrahydrofuran, tetrahydropyran, 1,4-dioxane and the like.
- esters include propylene carbonate, methyl acetate, ethyl acetate, propyl acetate, isopropyl acetate, butyl acetate, isobutyl acetate, amyl acetate, ethyl lactate, ethyl butyrate, dibutyl phthalate, dioctyl phthalate, and ⁇ -caprolactone, ⁇ - Cyclic esters such as caprolactam and the like.
- nitrogen-containing compounds examples include urea, pyrrolidone, N-methyl-2-pyrrolidone, octylpyrrolidone and the like.
- the content of the water-soluble organic solvent is preferably 20 to 40% by mass in the water-based pigment ink jet ink composition.
- the medium is a low-absorbent medium (coated paper, etc.)
- Additives and production methods that can be used in the aqueous inkjet recording ink composition for example, additives and production methods disclosed in JP-A-2017-149906 can be appropriately selected and used.
- the ink set for inkjet recording of the present invention can be used by accommodating the precoating agent of the present invention and the ink composition for inkjet recording separately in an ink cartridge or the like.
- the ink composition for inkjet recording is printed after forming a precoat layer with the precoating agent of the present invention.
- the ink composition for ink jet recording is used in this manner, motting and bleeding can be suppressed to improve the print image quality, and strike-through of the ink composition for ink jet recording can be suppressed. can.
- the laminate of the present invention has, on a substrate, a printed layer formed by the ink set for inkjet recording and an overcoat layer containing a resin in this order.
- the base material is not particularly limited as long as it can be used as a printing medium.
- Examples include thin paper, plain paper, reinforced paper, paper sheets such as resin-impregnated paper, titanium paper, polyethylene terephthalate sheet, and glycol-modified polyethylene terephthalate sheet. (PETG sheet), polyvinyl chloride sheet, polyethylene sheet, acrylonitrile-butadiene-styrene sheet, polypropylene sheet and other resin sheets, composite sheets thereof, and the like can be used.
- As the wooden base material for the wood veneer known plywood, particle board, hard board, medium density fiberboard (MDF), etc., which have conventionally been used as wood base materials for veneers, furniture, building members, etc. things are mentioned.
- the print layer has, in order from the substrate side, a precoat layer formed from the precoat agent of the present invention and an ink layer formed from the ink composition for inkjet recording.
- Examples of the method for applying the precoating agent of the present invention onto the base material include blade coaters, air knife coaters, roll coaters, bar coaters, gravure coaters, rod blade coaters, lip coaters, curtain coaters, die coaters, inkjets, and the like.
- a coating method using a coating device can be mentioned.
- the amount of the precoating agent applied is preferably 0.1 to 20 g/m 2 in solid content, and from the viewpoint of suitably imparting coating film resistance, 0.1 to 15 g/m 2 in solid content. is more preferable.
- a common dryer used in this field such as a hot air dryer, can be used.
- the coated surface coated with the precoating agent may be in a completely dry state or in a semi-dry state.
- the ink composition for inkjet recording it is preferable to apply by an inkjet method.
- the coating amount of the ink composition for inkjet recording is preferably 0.1 to 20 g/m 2 in solid content, and from the viewpoint of suitably imparting coating film resistance, 0.1 to 15 g/m in solid content. m 2 is more preferable.
- the laminate of the present invention has an overcoat layer containing a resin.
- the overcoat layer contains resin components that are used in known overcoat layers, and examples of such resin components include melamine resins, alkyd resins, polyamide resins, polyurethane resins, cellulose resins, (meth) Examples include acrylic resins, polyolefin resins, polyester resins, vinyl chloride resins, vinyl acetate resins, and the like.
- the overcoat layer can be formed by applying an overcoat layer composition containing the resin component and an organic solvent.
- the method for applying the overcoat layer composition include blade coaters, air knife coaters, roll coaters, bar coaters, gravure coaters, rod blade coaters, lip coaters, curtain coaters, die coaters, inkjets, and other various coating devices.
- the coating method used can be mentioned.
- the organic solvent which comprises the said overcoat layer composition can use a well-known organic solvent, selecting it suitably.
- the overcoat layer composition may also contain known additives such as lubricants, antifoaming agents, surfactants, leveling agents and pigments.
- the amount of the overcoat layer composition to be applied may be appropriately adjusted as necessary, but for example, it is preferably 0.1 to 100 g/m 2 in terms of solid content, which suitably imparts coating film resistance. From the point of view, the solid content is more preferably 0.1 to 80 g/m 2 .
- the laminate of the present invention has a printed layer formed by an ink set containing the precoating agent of the present invention, the printed image quality is good and strike-through of the ink composition for inkjet recording can be suppressed. Moreover, peeling of the overcoat layer and reduction in hardness can be suppressed.
- ⁇ Inorganic particles Cysilia 310 (porous silica, particle size 4 ⁇ m, pore volume 60 mL/g, average pore size 21 nm, manufactured by Fuji Silysia Ltd.) Cycilia 380 (porous silica, particle size 9 ⁇ m, pore volume 60 mL/g, average pore size 21 nm, manufactured by Fuji Silysia Co., Ltd.) ST-ZL (colloidal silica (non-porous), particle size 80 nm, manufactured by Nissan Chemical Industries, Ltd.) Cysilia 470 (porous silica, particle size 14 ⁇ m, pore volume 1.25 mL/g, average pore size 14 nm, manufactured by Fuji Silysia Co., Ltd.) ⁇ Organic acid amine salt> Triammonium citrate Diammonium malate Ammonium lactate ⁇ Organic acid> Citric acid ⁇ organic acid metal salt> Trisodium citrate ⁇ polyvalent
- Examples 1 to 13, Comparative Examples 1 to 9 The above materials were blended at the blending ratio shown in Table 1, and thoroughly stirred to prepare a mixed solution. This mixed solution was filtered through a #200 mesh metal filter to prepare precoating agents of Examples and Comparative Examples. In the precoating agents of Comparative Examples 6 and 9, the dispersion stability of various materials was too low, and each evaluation described below could not be performed.
- water-based resin varnish 20 parts by mass of an acrylic acid/n-butyl acrylate/benzyl methacrylate/styrene copolymer having a glass transition temperature of 40°C, a weight average molecular weight of 30,000 and an acid value of 185 mgKOH/g was dissolved in 2.5 parts by mass of potassium hydroxide and 77 parts by mass of water. 0.5 parts by mass of the resin was dissolved in a mixed solution to obtain a water-based resin varnish having a solid content of 20%.
- aqueous black ink base 64.3 parts by mass of water was added to 23.7 parts by mass of the aqueous resin varnish and mixed to prepare a resin varnish for pigment dispersion.
- 12 parts by mass of carbon black (trade name Printex 90, manufactured by Degussa) was further added, stirred and mixed, and kneaded with a wet circulation mill to prepare a water-based black ink base.
- aqueous yellow ink base 64.3 parts by mass of water was added to 23.7 parts by mass of the aqueous resin varnish and mixed to prepare a resin varnish for pigment dispersion.
- 12 parts by mass of a yellow pigment (trade name Novapalm Yellow 4G01, manufactured by Clariant) was further added, stirred and mixed, and kneaded with a wet circulation mill to prepare a water-based yellow ink base.
- aqueous magenta ink base 64.3 parts by mass of water was added to 23.7 parts by mass of the aqueous resin varnish and mixed to prepare a resin varnish for pigment dispersion.
- 12 parts by mass of a magenta pigment (trade name Inkjet Magenta E5B02, manufactured by Clariant) was further added, stirred and mixed, and kneaded with a wet circulation mill to prepare a water-based magenta ink base.
- aqueous cyan ink base 64.3 parts by mass of water was added to 23.7 parts by mass of the aqueous resin varnish and mixed to prepare a resin varnish for pigment dispersion.
- 12 parts by mass of a cyan pigment (trade name Heliogen Blue L7101F, manufactured by BASF) was further added, stirred and mixed, and kneaded with a wet circulation mill to prepare a water-based cyan ink base.
- a yellow ink composition was prepared in the same manner as the black ink composition, except that the water-based black ink base was changed to a water-based yellow ink base.
- magenta ink composition was prepared in the same manner as the black ink composition, except that the aqueous black ink base was changed to an aqueous magenta ink base.
- a cyan ink composition was prepared in the same manner as the black ink composition, except that the aqueous black ink base was changed to an aqueous cyan ink base.
- the overcoat layer composition was applied twice with a 0.3 mm bar coater to the printed matter that was not evaluated as x for strike-through, bleeding, or mottling, and reacted at 150 ° C. for 10 minutes. to form an overcoat layer. Thereafter, the coat layer was wiped off 10 times with a non-woven fabric impregnated with hydrochloric acid (1N), and the state of the surface of the overcoat layer was visually observed. In addition, it was judged that peeling and a decrease in hardness were able to be suppressed when an overcoat layer was formed with an evaluation of ⁇ . ⁇ : No peeling or dissolution of overcoat layer observed ⁇ : Peeling or dissolution of overcoat layer observed
- inkjet recording was performed without using a polyvalent metal salt.
- the ink composition for inkjet recording is printed, it is possible to suppress motaring and bleeding to improve the print image quality, suppress the strike-through of the ink composition for inkjet recording, and form an overcoat layer. It was confirmed that peeling of the overcoat layer and a decrease in hardness can be suppressed at the time of .
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Abstract
Description
また、従来の方法では、顔料の定着性を向上させるために前処理液(プレコート剤)に多価金属塩を含有させることが好ましいとされているが、前処理液が多価金属塩を含有すると、後工程(オーバーコート層の形成)で使用するオーバーコート用樹脂と反応してしまい、オーバーコート層が剥がれたり、硬度が低下したりしてしまうといった問題もあった。
また、上記有機酸のアミン塩は、ポリアクリル酸、蟻酸、酢酸、グリコール酸、マロン酸、リンゴ酸、マレイン酸、コハク酸、グルタル酸、フマル酸、クエン酸、酒石酸、及び、乳酸、若しくは、これらの誘導体から選択される少なくとも1種をアミンで中和した塩であることが好ましい。
また、上記樹脂エマルジョンは、スチレンアクリル系エマルジョン及び/又は酢酸ビニル系エマルジョンであることが好ましい。
また、本発明は、上記プレコート剤と、インクジェット記録用インク組成物とを含むインクジェット記録用インクセットである。
本発明のインクジェット記録用インクセットにおいて、上記インクジェット記録用インク組成物は、水性インクジェット記録用インク組成物であることが好ましい。
また。上記水性インクジェット記録用インク組成物は、アルカリ可溶性樹脂で被覆された顔料と、塩基性化合物と、水溶性有機溶剤とを含むことが好ましい。
また、本発明は、基材上に、上記インクジェット記録用インクセットにより形成された印刷層と、樹脂を含むオーバーコート層とをこの順に有する積層体でもある。
本発明は、インクジェット記録用インク組成物を受容するプレコート層を形成するために用いられるプレコート剤であって、無機粒子、有機酸のアミン塩、樹脂エマルジョン及び水を含み、上記無機粒子の粒径が1μm~10μmであり、多価金属塩を含まないプレコート剤である。
ただし、本発明は上記メカニズムに限定して解釈されなくてもよい。
本発明のプレコート剤は、無機粒子を含む。
上記無機粒子は、多孔質粒子であることが好ましく、多孔質シリカ粒子であることがより好ましい。
上記無機粒子は、単独又は2種以上併用して用いることができる。
上記無機粒子の粒径が1μm未満であると、裏抜けを抑制する効果が低下し、10μmを超えると、プレコート剤により形成される塗膜の平滑性の低下に起因して印刷画質が低下する。
上記無機粒子は、粒径が3μm~7μmであることがより好ましい。
なお、上記粒径は、レーザー回折散乱法を測定原理とする粒度分布測定装置により測定した体積平均粒子径を意味する。
また、細孔容積としては、10mL/g~200mL/gが好ましく、30mL/g~100mL/gがより好ましい。
なお、細孔容積及び比表面積はガス吸着法(窒素ガスを使用)によって得られる細孔分布に基づいて算出でき、具体的には、全細孔容積はBJH法を用い、比表面積はBET法を用いて算出できる。ガス吸着法を実施可能な装置としては、例えば、カンタクローム社製のオートソーブ3(製品名)等が挙げられる。
上記空孔率は、上記の細孔容積に基づいて算出することができる。
本発明のプレコート剤は、有機酸のアミン塩を含む。
有機酸のアミン塩とは、有機酸をアミンで中和した塩を意味する。
なかでも、プレコート剤の塗工ムラを抑制して、本発明の効果を好適に発揮させる観点から、水溶性の有機酸であることが好ましく、水溶性の多価カルボン酸であることがより好ましく、クエン酸、リンゴ酸が更に好ましい。
より具体的には、アンモニア;メチルアミン、ジメチルアミン、トリメチルアミン、エチルアミン、トリエチルアミン、プロピルアミン、ブチルアミン等のモノ又はジ又はトリアルキル(炭素数1~4)アミン;モノエタノールアミン、モノプロパノールアミン等のモノアルカノールアミン、ジメチルアミノエタノール等のモノ又はジアルキル(炭素数1~4)モノアルカノールアミンから選択される少なくとも1種を用いることができる。
なかでも、プレコート剤の塗膜の塗膜の凝集性を好適に付与する観点と、後述する基材に残留しにくい観点とから、アンモニアであることが好ましい。
本発明のプレコート剤は、樹脂エマルジョンを含む。
なかでも、プレコート剤の塗膜の凝集性に優れ、塗膜耐性を好適に付与する観点から、スチレンアクリル系エマルジョン及び/又は酢酸ビニル系エマルジョンが好ましい。
上記樹脂エマルジョンは、単独又は2種以上併用して用いることができる。
本発明のプレコート剤は、水を含む。
上記水としては、市販の精製水等を用いることができる。
なお、上記水の含有量は、上記樹脂エマルジョンに含まれる水の含有量と、上記樹脂エマルジョンに含まれる水性媒体以外の水の含有量を合計した値である。
本発明のプレコート剤は、必要に応じて、界面活性剤、増粘剤、pH調整剤を含むことが好ましい。
上記多価金属塩としては、2価以上の多価金属イオンとこれらの多価金属イオンに結合する陰イオンとから構成され、水に可溶なものである。
多価金属イオンの例としては、Ca2+、Cu2+、Ni2+、Mg2+、Zn2+、Ba2+、等が挙げられ、陰イオンの例としては、Cl-、NO3-、I-、Br-、ClO3-、等が挙げられる。
本発明のプレコート剤の製造方法は、特に限定されないが、例えば、上述した各成分に、必要に応じて添加剤等を加えて混錬することにより製造することができる。
本発明のインクジェット記録用インクセットは、本発明のプレコート剤と、インクジェット記録用インク組成物とを含む。
以下、インクジェット記録用インク組成物について説明する。
上記水性インクジェット記録用インク組成物とは、アルカリ可溶性樹脂で被覆された顔料と、塩基性化合物と、水溶性有機溶剤とを含むことが好ましい。
上記顔料としては、一般にインクジェット用インクで使用される各種の無機顔料や有機顔料を挙げることができる。
これらは単独で用いてもよく、2種以上を併用してもよい。
上記顔料を被覆するアルカリ可溶性樹脂としては、下記(a)から(c)を満足するアルカリ可溶性樹脂が使用できる。
(a)アルカリ可溶性樹脂の酸価が40~300mgKOH/gである。
(b)アルカリ可溶性樹脂の酸基の50~90%が塩基性化合物で中和されている。
(c)アルカリ可溶性樹脂が、その構成単位の単量体として、該アルカリ可溶性樹脂中にラウリル(メタ)アクリレートを20~40質量%となるように含有し、さらに芳香環を有する単量体、好ましくは、スチレン系単量体を含有する。
一例として、GPC装置としてWaters 2690(ウォーターズ社製)、カラムとしてPLgel 5μ MIXED-D(Polymer Laboratories社製)を使用してクロマトグラフィーを行ない、ポリスチレン換算の重量平均分子量として求めることができる。
上記アルカリ可溶性樹脂の酸基を中和する塩基性化合物としては、水酸化ナトリウム、水酸化カリウムのような無機塩基性化合物や、アンモニア、メチルアミン、エチルアミン、モノエタノールアミン、N,N-ジメチルエタノールアミン、N,N-ジエチルエタノールアミン、N,N-ジブチルエタノールアミン、ジエタノールアミン、N-メチルジエタノールアミン、トリエタノールアミン、モルホリン、N-メチルモルホリン、N-エチルモルホリンのような有機塩基性化合物等が挙げられる。これら塩基性化合物は、単独または2種以上を混合して用いることができる。中でも、顔料分散の点からモノエタノールアミン、N,N-ジメチルエタノールアミン、N、N-ジエチルエタノールアミン、N,N-ジブチルエタノールアミン、ジエタノールアミン、N-メチルジエタノールアミン、トリエタノールアミン等のアルカノールアミンが好適である。
上記被覆顔料の製造に用いられる2官能以上の架橋剤は、アルカリ可溶性樹脂を適度に架橋するために用いられる。本発明の架橋剤としては、2以上の反応性官能基を有する架橋剤であって、架橋剤の分子量としては、反応のし易さ及び保存安定性の観点から、100~2,000の範囲であることが好ましい。
上記2官能以上のエポキシ化合物の具体例としては、エポライト40E、100E、200E、400E、70P、200P、400P、1500NP、1600、80MF(共栄社化学(株)社製)、デナコールEX-201、EX-211、EX-212、EX-313、EX-314、EX-321、EX-411、EX-421、EX-512、EX-521、EX-611、EX-612、EX-614、EX-614B、EX-622(ナガセケムテックス(株)社製)等が例示できる。
上記被覆顔料は、酸基が塩基性化合物で中和されてなるアルカリ可溶性樹脂と顔料を水性溶媒中に溶解又は分散して、次いで、該アルカリ可溶性樹脂を塩析等して、不溶化された樹脂とすると共に顔料表面に付着させる。
この付着してなる不溶化された樹脂の50~90%の酸基を中和した。得られたアルカリ可溶性樹脂によって被覆された顔料から分散された分散液を得、この分散液に架橋剤を添加した後、これを加熱することによって、顔料表面を被覆しているアルカリ可溶性樹脂を架橋させ不溶化させて被覆顔料を製造する。
このとき、得られた架橋されたアルカリ可溶性樹脂は、アルカリ可溶性樹脂の理論酸価に対して架橋率が10~90%、好ましくは20~80%、さらに好ましくは30~70%、より好ましくは35~50%である。架橋率が10未満であると、顔料への被覆強度が十分ではない可能性があり、90%を超えると顔料の分散安定性を阻害する可能性がある。
上記水溶性有機溶剤は、水と共に水性媒体として使用される。
上記水としては、金属イオン等を除去したイオン交換水ないし蒸留水が好ましい。
また、水溶性有機溶剤を含有させることにより、保存安定性、吐出安定性、インクの飛翔性等で、より優れたインクジェット印刷適性を付与することができる場合がある。このような水溶性有機溶剤としては、例えば、モノアルコール類、多価アルコール類、多価アルコールの低級アルキルエーテル類、ケトン類、エーテル類、エステル類、窒素含有化合物類等を挙げることができる。これらは単独で用いてもよく、2種以上を併用してもよい。
上記多価アルコール類の具体例としては、エチレングリコール、プロピレングリコール、1,3-ブチレングリコール、1,4-ブチレングリコール、1,2-ペンタンジオール、1,5-ペンタンジオール、ネオペンチルグリコール、1,2-ヘキサンジオール、1,6-ヘキサンジオール、1,2-シクロヘキサンジオール、ヘプタンジオール、1,8-オクタンジオール、1,9-ノナンジオール、1,10-デカンジオール、グリセリン、ペンタエリスリトール、ジエチレングリコール、ジプロピレングリコール、トリエチレングリコール、テトラエチレングリコール、ポリエチレングリコール、ポリプロピレングリコール、チオジグリコール等が挙げられる。
上記多価アルコールの低級アルキルエーテル類の具体例としては、エチレングリコールモノメチルエーテル、エチレングリコールジメチルエーテル、エチレングリコールモノエチルエーテル、エチレングリコールジエチルエーテル、エチレングリコールモノプロピルエーテル、エチレングリコールイソプロピルエーテル、エチレングリコールモノブチルエーテル、エチレングリコールイソブチルエーテル、プロピレングリコールモノメチルエーテル、プロピレングリコールモノエチルエーテル、プロピレングリコールモノプロピルエーテル、プロピレングリコールモノブチルエーテル、ジエチレングリコールモノメチルエーテル、ジエチレングリコールモノエチルエーテル、ジプロピレングリコールモノ-n-プロピルエーテル、ジプロピレングリコールモノ-n-ブチルエーテル等が挙げられる。
上記ケトン類の具体例としては、アセトン、メチルエチルケトン、メチルブチルケトン、メチルイソブチルケトン、ジイソプロピルケトン、シクロペンタノン、シクロヘキサノン等が挙げられる。
上記エーテル類の具体例としては、イソプロピルエーテル、n-ブチルエーテル、テトラヒドロフラン、テトラヒドロピラン、1,4-ジオキサン等が挙げられる。
上記エステル類の例としては、プロピレンカーボネート、酢酸メチル、酢酸エチル、酢酸プロピル、酢酸イソプロピル、酢酸ブチル、酢酸イソブチル、酢酸アミル、乳酸エチル、酪酸エチル、ジブチルフタレート、ジオクチルフタレート、及びε-カプロラクトン、ε-カプロラクタム等の環状エステル等が挙げられる。
上記窒素含有化合物類の例としては、尿素、ピロリドン、N-メチル-2-ピロリドン、オクチルピロリドン等が挙げられる。
上記水溶性有機溶剤の含有量は、水性顔料型インクジェット用インク組成物中20~40質量%が好ましい。
また、メディアが低吸収性メディア(コート紙等)の場合、低吸収性メディアに浸透しやすい溶剤を使用することが好ましい。
水性インクジェット記録用インク組成物に用いることができる添加剤や、製造方法については、例えば、特開2017-149906号公報で開示されている添加剤及び製造方法を適宜選択して用いることができる。
このように用いることにより、インクジェット記録用インク組成物を印刷した際に、モタリングやブリードを抑制して印刷画質を良好にすることができ、インクジェット記録用インク組成物の裏抜けを抑制することができる。また、後述するオーバーコート層の剥がれや硬度の低下を抑制することができる。
本発明の積層体は、基材上に、上記インクジェット記録用インクセットにより形成された印刷層と、樹脂を含むオーバーコート層とをこの順に有する。
また、木質化粧板の木質基材としては、従来から化粧板や家具、建築部材等の木質基材として使用されている合板、パーティクルボード、ハードボード、中密度繊維板(MDF)等の公知のものが挙げられる。
上記オーバーコート層を有することにより、光輝性に優れ、耐久性のある印刷画像を得ることができる。
上記オーバーコート層用組成物を塗布する方法としては、例えば、ブレードコータ、エアーナイフコータ、ロールコータ、バーコータ、グラビアコータ、ロッドブレードコータ、リップコータ、カーテンコータ、ダイコータ、インクジェット等の各種塗工装置を用いた塗工方法が挙げられる。
なお、上記オーバーコート層用組成物を構成する有機溶剤は、公知の有機溶剤を適宜選択して用いることができる。
また、上記オーバーコート層用組成物は、滑剤、消泡剤、界面活性剤、レベリング剤、顔料等の公知の添加剤を含んでもよい。
サイシリア310(多孔質シリカ、粒子径4μm、細孔容積60mL/g、平均細孔径21nm、富士シリシア社製)
サイシリア380(多孔質シリカ、粒子径9μm、細孔容積60mL/g、平均細孔径21nm、富士シリシア社製)
ST-ZL(コロイダルシリカ(非多孔質)、粒子径80nm、日産化学社製)
サイシリア470(多孔質シリカ、粒子径14μm、細孔容積1.25mL/g、平均細孔径14nm、富士シリシア社製)
<有機酸アミン塩>
クエン酸3アンモニウム
リンゴ酸2アンモニウム
乳酸アンモニウム
<有機酸>
クエン酸
<有機酸金属塩>
クエン酸3ナトリウム
<多価金属塩>
酢酸カルシウム
<樹脂エマルジョン>
Joncryl PDX-7741(固形分50質量%、スチレン-アクリル系エマルジョン、BASF社製、ガラス転移温度0℃)
リカボンドS401(固形分50質量%、酢酸ビニル系エマルジョン、ジャパンコーティングレジン社製、ガラス転移温度 <0℃)
<界面活性剤>
オルフィンE1010(日信化学社製)
<増粘剤>
Primal ASE-95NP(ポリアクリル酸、DOW社製、アニオン性)
<pH調整剤>
NH3水
<水>
精製水
上記材料を表1に記載の配合比率で配合し、十分に攪拌を行って混合液を作製した。この混合液を#200メッシュの金属フィルターで濾過して、実施例及び比較例のプレコート剤を調製した。
なお、比較例6及び9のプレコート剤は、各種材料の分散安定性が低すぎて、後述する各評価を行うことができなかった。
(水性樹脂ワニス)
ガラス転移温度40℃、重量平均分子量30,000、酸価185mgKOH/gの、アクリル酸/n-ブチルアクリレート/ベンジルメタクリレート/スチレン共重合体20質量部を水酸化カリウム2.5質量部と水77.5質量部との混合溶液に溶解させて、固形分20%の水性樹脂ワニスを得た。
上記水性樹脂ワニスの23.7質量部に水64.3質量部を加え混合し、顔料分散用樹脂ワニスを調製した。このワニスに、更にカーボンブラック(商品名プリンテックス90、デグサ社製)の12質量部を加え、攪拌混合後、湿式サーキュレーションミルで練肉を行い、水性ブラックインクベースを調製した。
上記水性樹脂ワニスの23.7質量部に水64.3質量部を加え混合し、顔料分散用樹脂ワニスを調製した。このワニスに、更にイエロー顔料(商品名ノバパームイエロー4G01、クラリアント社製)の12質量部を加え、攪拌混合後、湿式サーキュレーションミルで練肉を行い、水性イエローインクベースを調製した。
上記水性樹脂ワニスの23.7質量部に水64.3質量部を加え混合し、顔料分散用樹脂ワニスを調製した。このワニスに、更にマゼンタ顔料(商品名インクジェットマゼンタE5B02、クラリアント社製)の12質量部を加え、攪拌混合後、湿式サーキュレーションミルで練肉を行い、水性マゼンタインクベースを調製した。
上記水性樹脂ワニスの23.7質量部に水64.3質量部を加え混合し、顔料分散用樹脂ワニスを調製した。このワニスに、更にシアン顔料(商品名ヘリオゲンブルーL7101F、BASF社製)の12質量部を加え、攪拌混合後、湿式サーキュレーションミルで練肉を行い、水性シアンインクベースを調製した。
下記に記載した各材料のうち、水性ブラックインクベースを除いたものを、下記の添加量で混合し、十分に攪拌した後、水性ブラックインクベース33質量部を攪拌しながら添加した。
十分に攪拌を行った後、この混合液を#3500メッシュの金属フィルターで濾過し、中空糸膜による脱気を行って、水性ブラックインクを調製した。
水性ブラックインクベース:33質量部
界面活性剤(オルフィンE1010、日信化学社製):0.5質量部
グリセリン:15質量部
ジエチレングリコール:14.5質量部
水:37質量部
水性ブラックインクベースを水性イエローインクベースに変更したこと以外はブラックインク組成物の調製と同様にしてイエローインク組成物を作製した。
水性ブラックインクベースを水性マゼンタインクベースに変更したこと以外はブラックインク組成物の調製と同様にしてマゼンタインク組成物を作製した。
水性ブラックインクベースを水性シアンインクベースに変更したこと以外はブラックインク組成物の調製と同様にしてシアンインク組成物を作製した。
下記に記載した各材料を、下記の添加量で混合し、十分に攪拌を行って混合液を作製した。
この混合液を#200メッシュの金属フィルターで濾過して、オーバーコート層用組成物を調製した。
ジメチロールメラミンS260、日本カーバイド社製):50質量部
界面活性剤(サーフィノール440、日信化学社製):1質量部
2-ピロリドン:10質量部
水:39質量部
(裏抜け)
実施例、比較例で作製したプレコート剤を、0.1mmバーコータにより紙上に塗布し80℃で3分乾燥させた後、各種水性インクジェット記録用インク組成物をインクジェットプリンターPX105(エプソン社製)のカートリッジに詰めて、印字を行い、裏抜けの有無について確認し、以下の基準で評価した。その結果を表1に示す。
なお、〇及び△を合格と評価した。
○:裏抜けが見られないもの
△:少量の裏抜けが見られるもの
×:多量の裏抜けが見られるもの
実施例、比較例で作製したプレコート剤を、0.1mmバーコータにより紙上に塗布し80℃で3分乾燥させた後、各種水性インクジェット記録用インク組成物をインクジェットプリンターPX105(エプソン社製)のカートリッジに詰めて、印字を行い、ブリード(色間ブリード)の有無を確認し、以下の基準で評価した。その結果を表1に示す。
なお、〇及び△を合格と評価した。
○:ブリードが見られないもの
△:少量のブリードが見られるもの
×:多量のブリードが見られるもの
実施例、比較例で作製したプレコート剤を、0.1mmバーコータにより紙上に塗布し80℃で3分乾燥させた後、各種水性インクジェット記録用インク組成物をインクジェットプリンターPX105(エプソン社製)のカートリッジに詰めて、100%ベタ印字を行い、ベタ部のスジが見られるかの有無を以下の基準で評価した。その結果を表1に示す。
なお、〇及び△を合格と評価した。
○:ベタ部にスジが見られないもの
△:少量のスジが見られるもの
×:多量のスジが見られるもの
上述した実施例、比較例において、裏抜け、ブリード、モタリングでいずれも×評価にならない印刷物に対して、0.3mmバーコータによりオーバーコート層用組成物を2回塗布し、150℃で10分反応させてオーバーコート層を形成した。
その後、塩酸(1N)を浸みこませた不織布でコート層を10回ふき取り、オーバーコート層の表面の状態を目視で確認した。
なお、〇評価のオーバーコート層が形成されたものを、剥がれや硬度の低下を抑制できたものと判断した。
○:オーバーコート層の剥がれ、溶解が見られないもの
×:オーバーコート層の剥がれ、溶解が見られるもの
Claims (8)
- インクジェット記録用インク組成物を受容するプレコート層を形成するために用いられるプレコート剤であって、
無機粒子、有機酸のアミン塩、樹脂エマルジョン及び水を含み、
前記無機粒子は、粒径が1μm~10μmであり、
多価金属塩を含まないプレコート剤。 - 前記無機粒子は、多孔質シリカ粒子である請求項1に記載のプレコート剤。
- 前記有機酸のアミン塩は、ポリアクリル酸、蟻酸、酢酸、グリコール酸、マロン酸、リンゴ酸、マレイン酸、コハク酸、グルタル酸、フマル酸、クエン酸、酒石酸、及び、乳酸、若しくは、これらの誘導体から選択される少なくとも1種をアミンで中和した塩である請求項1又は2に記載のプレコート剤。
- 前記樹脂エマルジョンは、スチレンアクリル系エマルジョン及び/又は酢酸ビニル系エマルジョンである請求項1~3のいずれか1項に記載のプレコート剤。
- 請求項1~4のいずれか1項に記載のプレコート剤と、インクジェット記録用インク組成物とを含む、インクジェット記録用インクセット。
- 前記インクジェット記録用インク組成物は、水性インクジェット記録用インク組成物である、請求項5記載のインクジェット記録用インクセット。
- 前記水性インクジェット記録用インク組成物は、アルカリ可溶性樹脂で被覆された顔料と、塩基性化合物と、水溶性有機溶剤とを含む、請求項6記載のインクジェット記録用インクセット。
- 基材上に、請求項5~7のいずれか1項に記載のインクジェット記録用インクセットにより形成された印刷層と、樹脂を含むオーバーコート層とをこの順に有する積層体。
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WO2003043825A1 (fr) * | 2001-10-12 | 2003-05-30 | Seiko Epson Corporation | Enregistreur a jet d'encre et son procede d'enregistrement |
JP2004255772A (ja) | 2003-02-27 | 2004-09-16 | Canon Finetech Inc | 被記録媒体 |
JP2013180408A (ja) * | 2012-02-29 | 2013-09-12 | Canon Inc | インクジェット記録方法 |
JP2014073672A (ja) | 2012-09-13 | 2014-04-24 | Ricoh Co Ltd | 画像形成方法 |
JP2017149906A (ja) | 2016-02-26 | 2017-08-31 | サカタインクス株式会社 | 水性顔料型インクジェット用インク組成物 |
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WO2003043825A1 (fr) * | 2001-10-12 | 2003-05-30 | Seiko Epson Corporation | Enregistreur a jet d'encre et son procede d'enregistrement |
JP2004255772A (ja) | 2003-02-27 | 2004-09-16 | Canon Finetech Inc | 被記録媒体 |
JP2013180408A (ja) * | 2012-02-29 | 2013-09-12 | Canon Inc | インクジェット記録方法 |
JP2014073672A (ja) | 2012-09-13 | 2014-04-24 | Ricoh Co Ltd | 画像形成方法 |
JP2017149906A (ja) | 2016-02-26 | 2017-08-31 | サカタインクス株式会社 | 水性顔料型インクジェット用インク組成物 |
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