Aqueous composition liquid

Abstract

To provide an aqueous composition liquid that is capable of applying an image having excellent image density and scratch resistance to a base material.SOLUTION: An aqueous composition liquid is discharged onto a base material. The aqueous composition contains water, a pigment and a resin emulsion. The resin emulsion contains a resin emulsion A having a glass transition temperature (Tg) of 80°C or higher and a resin emulsion B having a glass transition temperature (Tg) of 40-65°C. The ratio of the resin emulsion A to the resin emulsion B in the aqueous composition liquid is 2 to 5 as the mass ratio of the resin emulsion A / the resin emulsion B.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an aqueous composition liquid and a recording apparatus.

Background Art

[0002] Inkjet printers using the inkjet recording method have rapidly spread because they are small, inexpensive, and easy to colorize. In recent years, it has been required to record high-quality ink recordings at high speed, and inks used in the inkjet recording method must satisfy various characteristics in order to meet this requirement.

[0003] Conventionally, dye inks have been widely used, but there are problems with weather resistance and the image density on plain paper is not sufficient. Therefore, in recent years, pigment inks have been widely used. Pigment inks have high image density because pigment particles remain on the surface of the paper, but on the other hand, the rub resistance is not sufficient. Conventionally, inks containing wax emulsions have been studied to improve rub resistance (see, for example, Patent Document 1).

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the technology disclosed in Patent Document 1, although the degree of rub resistance is improved, it cannot be said that the improvement is sufficient. Inks containing resin emulsions with a low glass transition point, such as urethane resin emulsions, have also been studied. Although the rub resistance of these inks is sufficiently improved, when heated to dry the image after printing, the image density decreases.

[0005] Therefore, an object of the present invention is When used in a recording device that dispenses an aqueous composition liquid onto a substrate and has a transport member that transports the substrate while holding it, and in which a part of the transport member is bent and deformed within the region that holds the substrate, to provide an aqueous composition liquid capable of imparting an image having excellent image density and rub resistance to a substrate.

Means for Solving the Problems

[0006] The above problems are solved by the following configuration 1). 1) An aqueous composition liquid discharged onto a substrate, The aqueous composition solution comprises water, a pigment, and a resin emulsion, wherein the resin emulsion contains resin emulsion A having a glass transition temperature (Tg) of 80°C or higher and resin emulsion B having a glass transition temperature (Tg) of 40 to 65°C. The ratio of resin emulsion A to resin emulsion B in the aqueous composition is such that the mass ratio of resin emulsion A to resin emulsion B is 2 to 5. the law of nature, The recording device comprises a discharge mechanism for dispensing the aqueous composition liquid onto a substrate, and a substrate processing mechanism for processing the substrate from which the aqueous composition liquid has been dispensed by the discharge mechanism, wherein the substrate processing mechanism includes a transport member for transporting the substrate while holding it, and a pressing member for bending and deforming a part of the transport member within the region where the transport member holds the substrate. An aqueous compositional liquid characterized by the following features. [Effects of the Invention]

[0007] According to the present invention, When used in a recording device that dispenses an aqueous composition liquid onto a substrate and has a transport member that transports the substrate while holding it, and in which a part of the transport member is bent and deformed within the region that holds the substrate, This invention provides an aqueous solution that can impart images with excellent image density and abrasive properties to a substrate. [Brief explanation of the drawing]

[0008] [Figure 1] This is a schematic diagram illustrating a recording device equipped with a substrate processing mechanism used in the present invention. [Figure 2] This is a side view diagram illustrating the substrate processing mechanism of the present invention. [Figure 3] This is an explanatory diagram of the pressing roller portion of the substrate processing mechanism of the present invention. [Modes for carrying out the invention]

[0009] Embodiments of the present invention will be described in further detail below. The recording device of the present invention comprises an aqueous composition liquid, a discharge mechanism for discharging the aqueous composition liquid onto a substrate, and a substrate processing mechanism for processing the substrate from which the aqueous composition liquid has been discharged by the discharge mechanism, wherein the substrate processing mechanism comprises a transport member for transporting the substrate while holding it, and a pressing member for bending and deforming a part of the transport member within the region in which the transport member holds the substrate, wherein the aqueous composition liquid contains water, a pigment, and a resin emulsion, and the resin emulsion contains resin emulsion A having a glass transition temperature (Tg) of 80°C or higher and resin emulsion B having a glass transition temperature (Tg) of 40 to 65°C.

[0010] The recording device of the present invention can impart images with excellent image density and abrasive properties to a substrate. The mechanism of action is presumed to be that, when the substrate is transported between transport members in the substrate processing mechanism, the transport members are bent and deformed by the pressing member, the substrate and the transport members come into contact, and the image is abraded. The frictional heat promotes the formation of a resin emulsion film in the aqueous composition liquid, making the image surface smoother, which increases gloss and improves image density and abrasive properties. Furthermore, this effect is presumed to be further enhanced by the resin emulsions A and B contained in the aqueous composition liquid.

[0011] First, the aqueous composition liquid in the present invention will be described. The aqueous composition liquid comprises water, pigment, and resin emulsion, and may further contain organic solvents, penetrants, and other components as needed. In the following description, ink will be used as an example of the aqueous composition liquid in the present invention, but the aqueous composition liquid in the present invention is not limited to ink.

[0012] <Organic solvents> The organic solvent used in the present invention is not particularly limited, and water-soluble organic solvents can be used. Examples include polyhydric alcohols, ethers such as polyhydric alcohol alkyl ethers and polyhydric alcohol aryl ethers, nitrogen-containing heterocyclic compounds, amides, amines, and sulfur-containing compounds. Specific examples of water-soluble organic solvents include, for example, ethylene glycol, diethylene glycol, 1,2-propanediol, 1,3-propanediol, 1,2-butanediol, 1,3-butanediol, 1,4-butanediol, 2,3-butanediol, 3-methyl-1,3-butanediol, triethylene glycol, polyethylene glycol, polypropylene glycol, 1,2-pentanediol, 1,3-pentanediol, 1,4-pentanediol, 2,4-pentanediol, and 1,5-pentanediol. Polyhydric alcohols such as pentanediol, 1,2-hexanediol, 1,6-hexanediol, 1,3-hexanediol, 2,5-hexanediol, 1,5-hexanediol, glycerin, 1,2,6-hexanetriol, 2-ethyl-1,3-hexanediol, ethyl-1,2,4-butanetriol, 1,2,3-butanetriol, 2,2,4-trimethyl-1,3-pentanediol, petriol, ethylene glycol monoethyl ether, and ethylene glycol monobutyl ether. Examples include polyhydric alcohol alkyl ethers such as diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, tetraethylene glycol monomethyl ether, and propylene glycol monoethyl ether; polyhydric alcohol aryl ethers such as ethylene glycol monophenyl ether and ethylene glycol monobenzyl ether; nitrogen-containing heterocyclic compounds such as 2-pyrrolidone, N-methyl-2-pyrrolidone, N-hydroxyethyl-2-pyrrolidone, 1,3-dimethyl-2-imidazolidinone, ε-caprolactam, and γ-butyrolactone; amides such as formamide, N-methylformamide, N,N-dimethylformamide, 3-methoxy-N,N-dimethylpropionamide, and 3-butoxy-N,N-dimethylpropionamide; amines such as monoethanolamine, diethanolamine, and triethylamine; sulfur-containing compounds such as dimethyl sulfoxide, sulfolane, and thiodiethanol; propylene carbonate; and ethylene carbonate. It is preferable to use an organic solvent with a boiling point of 250°C or lower, as it not only functions as a wetting agent but also provides good drying properties.

[0013] <Penetrant> Polyol compounds having 8 or more carbon atoms and glycol ether compounds are also preferably used. Specific examples of the polyol compounds having 8 or more carbon atoms include 2-ethyl-1,3-hexanediol and 2,2,4-trimethyl-1,3-pentanediol. Specific examples of the glycol ether compounds include polyhydric alcohol alkyl ethers such as ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, tetraethylene glycol monomethyl ether, and propylene glycol monoethyl ether; and polyhydric alcohol aryl ethers such as ethylene glycol monophenyl ether and ethylene glycol monobenzyl ether. The polyol compounds having 8 or more carbon atoms and the glycol ether compounds can improve the ink permeability when paper is used as the recording medium. The content of the above organic solvent in the ink is not particularly limited and can be appropriately selected according to the purpose. From the viewpoints of the drying property and ejection reliability of the ink, it is preferably 10% by mass or more and 60% by mass or less, and more preferably 20% by mass or more and 60% by mass or less.

[0014] <Water> The content of water in the ink is not particularly limited and can be appropriately selected according to the purpose. From the viewpoints of the drying property and ejection reliability of the ink, it is preferably 10% by mass or more and 90% by mass or less, and more preferably 20% to 60% by mass.

[0015] <Pigment> Pigments can be used as coloring materials. As the pigment, an inorganic pigment or an organic pigment can be used. These can be used alone or in combination of two or more. Also, mixed crystals can be used. As pigments, for example, black pigments, yellow pigments, magenta pigments, cyan pigments, white pigments, green pigments, orange pigments, metallic pigments such as gold and silver, and the like can be used. As inorganic pigments, in addition to titanium oxide, iron oxide, calcium carbonate, barium sulfate, aluminum hydroxide, barium yellow, cadmium red, chrome yellow, carbon black produced by known methods such as the contact method, the furnace method, and the thermal method can be used. Also, as organic pigments, azo pigments, polycyclic pigments (for example, phthalocyanine pigments, perylene pigments, perinone pigments, anthraquinone pigments, quinacridone pigments, dioxazine pigments, indigo pigments, thioindigo pigments, isoindolinone pigments, quinophthalone pigments, etc.), dye chelates (for example, basic dye type chelates, acidic dye type chelates, etc.), nitro pigments, nitroso pigments, aniline black, and the like can be used. Among these pigments, those with good affinity for the solvent are preferably used. In addition, the use of resin hollow particles and inorganic hollow particles is also possible. Specific examples of pigments include, for black, carbon blacks (C.I. Pigment Black 7) such as furnace black, lamp black, acetylene black, channel black, etc., or metals such as copper, iron (C.I. Pigment Black 11), titanium oxide, and organic pigments such as aniline black (C.I. Pigment Black 1). Furthermore, for color applications, we have CI Pigment Yellow 1, 3, 12, 13, 14, 17, 24, 34, 35, 37, 42 (yellow iron oxide), 53, 55, 74, 81, 83, 95, 97, 98, 100, 101, 104, 108, 109, 110, 117, 120, 138, 150, 153, 155, 180, 185, 213, and CI Pigment O Range 5, 13, 16, 17, 36, 43, 51, CI Pigment Red 1, 2, 3, 5, 17, 22, 23, 31, 38, 48:2, 48:2 (Permanent Red 2B(Ca)), 48:3, 48:4, 49:1, 52:2, 53:1, 57:1 (Brilliant Carmine 6B), 60:1, 63:1, 63:2, 64:1, 81, 83, 88 , 101 (Bengara), 104, 105, 106, 108 (Cadmium Red), 112, 114, 122 (Quinacridone Magenta), 123, 146, 149, 166, 168, 170, 172, 177, 178, 179, 184, 185, 190, 193, 202, 207, 208, 209, 213, 219, 224, 254, 264, CI Pigment Violet 1 (Rhodamine Lake), 3, 5:1, 16, 19, 23, 38; CI Pigment Blue 1, 2, 15 (Phthalocyanine Blue), 15:1, 15:2, 15:3, 15:4 (Phthalocyanine Blue), 16, 17:1, 56, 60, 63; CI Pigment Green 1, 4, 7, 8, 10, 17, 18, 36, etc. are available.

[0016] The colorant content in the ink is preferably 0.1% by mass or more and 15% by mass or less, and more preferably 1% by mass or more and 10% by mass or less, from the viewpoint of improving image density, good fixation and ejection stability. Methods for dispersing pigments in ink include introducing hydrophilic functional groups into the pigment to create a self-dispersible pigment, coating the surface of the pigment with a resin to disperse it, and using a dispersant to disperse it. One method for creating self-dispersible pigments by introducing hydrophilic functional groups into pigments is to use self-dispersible pigments, for example, which are made dispersible in water by adding functional groups such as sulfone groups or carboxyl groups to a pigment (e.g., carbon). As a method for coating and dispersing the surface of a pigment with a resin, the pigment can be encapsulated in microcapsules that are dispersible in water. This can be rephrased as resin-coated pigment. In this case, it is not necessary for all pigments incorporated into the ink to be coated with resin; as long as the effects of the present invention are not impaired, uncoated pigments or partially coated pigments may be dispersed in the ink.

[0017] Methods of dispersion using dispersants include using well-known low-molecular-weight dispersants, such as surfactants, and high-molecular-weight dispersants. Depending on the pigment, dispersants such as anionic surfactants, cationic surfactants, amphoteric surfactants, and nonionic surfactants can be used. RT-100 (nonionic surfactant) manufactured by Takemoto Oil & Fat Co., Ltd., and sodium naphthalene sulfonate formalin condensate can also be suitably used as dispersants. Dispersing agents may be used individually or in combination of two or more.

[0018] <Pigment dispersion> It is possible to obtain ink by mixing colorants with materials such as water and organic solvents. Alternatively, ink can be manufactured by mixing pigments with other materials such as water and dispersants to create a pigment dispersion, and then mixing this dispersion with water and organic solvents. The aforementioned pigment dispersion is obtained by dispersing water, pigment, pigment dispersant, and other components as needed, and adjusting the particle size. Dispersion is preferably carried out using a disperser. There are no particular restrictions on the particle size of the pigment in the pigment dispersion, but a maximum frequency of 20 nm to 500 nm (in terms of maximum number) is preferred, and 20 nm to 150 nm is more preferred, as this improves the dispersion stability of the pigment and enhances image quality such as ejection stability and image density. The particle size of the pigment can be measured using a particle size analyzer (NanoTrac Wave-UT151, manufactured by MicroTrac-Bell Co., Ltd.). The pigment content in the pigment dispersion is not particularly limited and can be appropriately selected depending on the purpose, but from the standpoint of obtaining good discharge stability and increasing image density, it is preferably 0.1% by mass or more and 50% by mass or less, and more preferably 0.1% by mass or more and 30% by mass or less. The pigment dispersion is preferably filtered to remove coarse particles and degassed using a filter, centrifuge, or other means, as needed.

[0019] <Resin> The ink contains resin emulsion A, which has a glass transition temperature (Tg) of 80°C or higher, and resin emulsion B, which has a glass transition temperature (Tg) of 40 to 65°C.

[0020] If the Tg of the resin emulsion A is less than 80°C, the effects of the present invention will not be achieved, and image peeling may occur due to blocking when printed materials overlap. The preferred Tg of the resin emulsion A is 80°C to 100°C.

[0021] Furthermore, a Tg of the resin emulsion B of 40 to 65°C is preferable because it allows for a high level of both suppression of blocking of printed materials and abrasion resistance.

[0022] The Tg of the resin emulsion in this invention is measured by the following measurement method. 5 g of ink is dropped into a 4 cm diameter Teflon® petri dish and dried at 50°C for 72 hours to obtain a dried resin. The obtained dried resin is measured using a differential scanning calorimeter (Thermo plus EVO2 DSC8231, manufactured by Rigaku Corporation) and the glass transition temperature (Tg) is calculated.

[0023] Examples of resins include urethane resin, polyester resin, acrylic resin, vinyl acetate resin, styrene resin, butadiene resin, styrene-butadiene resin, vinyl chloride resin, styrene-acrylic resin, and acrylic silicone resin. Resin particles made from these resins may also be used. It is possible to obtain ink by mixing the resin emulsion, in which the resin particles are dispersed with water as a dispersion medium, with materials such as colorants and organic solvents. The resin particles may be synthesized as appropriate, or commercially available products may be used.

[0024] There are no particular restrictions on the volume-average particle size of the resin particles, and they can be appropriately selected depending on the purpose. However, from the viewpoint of improving the effects of the present invention, 30 nm to 200 nm is preferred, and 50 nm to 120 nm is more preferred. Furthermore, from the viewpoint of obtaining good image hardness, it is preferable that the difference in cumulative particle size D50 between the pigment and the resin emulsion is 10 nm or less. The volume-average particle size can be measured, for example, using a particle size analyzer (NanoTrac Wave-UT151, manufactured by MicroTrac-Bell Co., Ltd.).

[0025] Furthermore, from the viewpoint of improving the effects of the present invention, the ratio of resin emulsion A to resin emulsion B is preferably 2 to 5 as the mass ratio of resin emulsion A to resin emulsion B.

[0026] There are no particular restrictions on the resin content, and it can be appropriately selected depending on the purpose. However, from the viewpoint of fixation and storage stability of the ink, it is preferable that the resin content be 1% to 30% by mass, and more preferably 5% to 20% by mass, relative to the total amount of ink.

[0027] Furthermore, wax can be added to the ink. Adding wax improves its abrasion resistance.

[0028] A water-dispersible wax emulsion is preferred as the aforementioned wax. Examples of the aforementioned waxes include polyethylene wax and paraffin wax. These may be used individually or in combination of two or more. Among these, polyethylene wax is preferred in terms of storage stability.

[0029] Commercially available waxes can be used, and examples of such commercially available waxes include: product name: HYTEC E-8237 (polyethylene wax, melting point: 106℃, average particle size: 80nm, manufactured by Toho Chemical Industry Co., Ltd.), product name: AQUACER531 (polyethylene wax, melting point: 130℃, manufactured by Bic Chemie), product name: AQUACER515 (polyethylene wax, melting point: 135℃, manufactured by Bic Chemie), and product name: AQUACER537 (paraffin, melting point: 110℃, manufactured by Bic Chemie). These may be used individually or in combination of two or more types.

[0030] The melting point of the wax is preferably 70°C to 170°C, and more preferably 100°C to 140°C. If the melting point is 70°C or higher, the image will not become sticky, and image transfer will not occur even when images are superimposed. If the melting point is 170°C or lower, the wax will melt due to the frictional heat generated when the image is rubbed, resulting in good slipperiness and thus good scratch resistance.

[0031] The volume-average particle size of the wax is preferably 200 nm or less, and more preferably 20 nm to 150 nm. When the volume-average particle size is 200 nm or less, it does not get caught in the nozzle or the filter in the head, and good discharge stability can be obtained. The volume-average particle size can be measured, for example, using a particle size analyzer (Microtrac MODEL UPA9340, manufactured by Nikkiso Co., Ltd.).

[0032] The wax content is preferably 0.05 to 3% by mass, and more preferably 0.1 to 1% by mass, based on the total amount of ink.

[0033] <Additives> The ink may contain surfactants, defoamers, preservatives, antifungal agents, rust inhibitors, pH adjusters, etc., as needed.

[0034] <Surfactants> Any of the following surfactants can be used: silicone-based surfactants, fluorine-based surfactants, amphoteric surfactants, nonionic surfactants, and anionic surfactants.

[0035] There are no particular restrictions on silicone-based surfactants, and they can be appropriately selected according to the purpose. Among them, those that do not decompose even at high pH are preferred, and examples include side-chain modified polydimethylsiloxane, both-end modified polydimethylsiloxane, one-end modified polydimethylsiloxane, and both-end modified polydimethylsiloxane. Those having a polyoxyethylene group or a polyoxyethylene polyoxypropylene group as a modifying group are particularly preferred because they exhibit good properties as aqueous surfactants. In addition, polyether-modified silicone-based surfactants can also be used as the silicone-based surfactant, and examples include compounds in which a polyalkylene oxide structure is introduced into the Si side chain of dimethylsiloxane.

[0036] Examples of fluorinated surfactants include perfluoroalkyl sulfonic acid compounds, perfluoroalkyl carboxylic acid compounds, perfluoroalkyl phosphate ester compounds, perfluoroalkyl ethylene oxide adducts, and polyoxyalkylene ether polymer compounds having perfluoroalkyl ether groups in their side chains, as they exhibit low foaming properties. Examples of the perfluoroalkyl sulfonic acid compounds include perfluoroalkyl sulfonic acid and perfluoroalkyl sulfonate salts. Examples of the perfluoroalkyl carboxylic acid compounds include perfluoroalkyl carboxylic acid and perfluoroalkyl carboxylic acid salts. Examples of polyoxyalkylene ether polymer compounds having perfluoroalkyl ether groups in their side chains include sulfate ester salts of polyoxyalkylene ether polymers having perfluoroalkyl ether groups in their side chains and salts of polyoxyalkylene ether polymers having perfluoroalkyl ether groups in their side chains. Examples of counterions for the salts of these fluorinated surfactants include Li, Na, K, NH4, NH3CH2CH2OH, NH2(CH2CH2OH)2, and NH(CH2CH2OH)3.

[0037] Examples of amphoteric surfactants include laurylaminopropionate, lauryldimethylbetaine, stearyldimethylbetaine, and lauryldihydroxyethylbetaine. Examples of nonionic surfactants include polyoxyethylene alkylphenyl ethers, polyoxyethylene alkyl esters, polyoxyethylene alkylamines, polyoxyethylene alkylamides, polyoxyethylene propylene block polymers, sorbitan fatty acid esters, polyoxyethylene sorbitan fatty acid esters, and ethylene oxide adducts of acetylene alcohol. Examples of anionic surfactants include polyoxyethylene alkyl ether acetate, dodecylbenzene sulfonate, lauryl salt, and salts of polyoxyethylene alkyl ether sulfate. These can be used individually or in combination of two or more types.

[0038] There are no particular limitations on the silicone-based surfactant, and it can be appropriately selected depending on the purpose. Examples include side-chain modified polydimethylsiloxane, both-end modified polydimethylsiloxane, one-end modified polydimethylsiloxane, and both-end modified polydimethylsiloxane. Polyether-modified silicone-based surfactants having a polyoxyethylene group or a polyoxyethylene-polyoxypropylene group as a modifying group are particularly preferred as they exhibit good properties as aqueous surfactants. Such surfactants may be synthesized as appropriate, or commercially available products may be used. Commercially available products include, for example, those from BIC Chemie Inc., Shin-Etsu Chemical Co., Ltd., Toray Dow Corning Silicone Co., Ltd., Nippon Emulsion Co., Ltd., and Kyoeisha Chemical Co., Ltd. There are no particular limitations on the polyether-modified silicone surfactants mentioned above, and they can be appropriately selected depending on the purpose. For example, one example is a polyalkylene oxide structure represented by the general formula (S-1), in which a polyalkylene oxide structure is introduced into the Si side chain of dimethylpolysiloxane.

[0039] [ka]

[0040] (However, in general formula (S-1), m, n, a, and b represent integers. R and R' represent alkyl groups and alkylene groups, respectively.)

[0041] Commercially available polyether-modified silicone surfactants can be used, such as KF-618, KF-642, KF-643 (Shin-Etsu Chemical Co., Ltd.), EMALEX-SS-5602, SS-1906EX (Nippon Emulsion Co., Ltd.), FZ-2105, FZ-2118, FZ-2154, FZ-2161, FZ-2162, FZ-2163, FZ-2164 (Toray Dow Corning Silicone Co., Ltd.), BYK-33, BYK-387 (BIC Chemie Co., Ltd.), TSF4440, TSF4452, TSF4453 (Toshiba Silicone Co., Ltd.).

[0042] As the fluorine-based surfactant, compounds with 2 to 16 fluorine-substituted carbon atoms are preferred, and compounds with 4 to 16 fluorine-substituted carbon atoms are more preferred. Examples of fluorinated surfactants include perfluoroalkyl phosphate compounds, perfluoroalkyl ethylene oxide adducts, and polyoxyalkylene ether polymer compounds having perfluoroalkyl ether groups in their side chains. Among these, polyoxyalkylene ether polymer compounds having perfluoroalkyl ether groups in their side chains are preferred because they have low foaming properties, and fluorinated surfactants represented by general formulas (F-1) and (F-2) are particularly preferred.

[0043] [ka]

[0044] In the compound represented by the above general formula (F-1), m is preferably an integer between 0 and 10, and n is preferably an integer between 0 and 40, in order to impart water solubility.

[0045] General formula (F-2) C n F 2n+1- CH2CH(OH)CH2-O-(CH2CH2O) a -Y

[0046] In the compound represented by the above general formula (F-2), Y is H or CnF 2n+1 n is an integer from 1 to 6, or CH2CH(OH)CH2-CnF 2n+1 n is an integer between 4 and 6, or CpH 2p+1 p is an integer between 1 and 19, and a is an integer between 4 and 14.

[0047] Commercially available fluorine-based surfactants may be used as described above. Examples of such commercial products include: Surflon S-111, S-112, S-113, S-121, S-131, S-132, S-141, S-145 (all manufactured by Asahi Glass Co., Ltd.); Flurad FC-93, FC-95, FC-98, FC-129, FC-135, FC-170C, FC-430, FC-431 (all manufactured by Sumitomo 3M Limited); Megafac F-470, F-1405, F-474 (all manufactured by Dainippon Ink and Chemicals, Inc.); Zonyl TBS, FSP, FSA, FSN-100, F Examples include SN, FSO-100, FSO, FS-300, UR (all manufactured by DuPont); FT-110, FT-250, FT-251, FT-400S, FT-150, FT-400SW (all manufactured by Neos Corporation); Polyfox PF-136A, PF-156A, PF-151N, PF-154, PF-159 (manufactured by Omnova); and Unidyne DSN-403N (manufactured by Daikin Industries, Ltd.). Among these, DuPont stands out for its excellent print quality, particularly its remarkable improvement in color reproduction, paper penetration, wettability, and uniform dyeing properties. Particularly preferred are the FS-300 from Pont, the FT-110, FT-250, FT-251, FT-400S, FT-150, and FT-400SW from Neos Corporation, the Polyfox PF-151N from Omnova, and the Unidyne DSN-403N from Daikin Industries, Ltd.

[0048] There are no particular restrictions on the surfactant content in the ink, and it can be appropriately selected depending on the purpose. However, from the standpoint of excellent wettability, ejection stability, and improved image quality, a value of 0.001% to 5% by mass is preferred, and a value of 0.05% to 5% by mass is more preferred.

[0049] <Defoaming agent> There are no particular restrictions on the defoaming agent, and examples thereof include silicone-based defoaming agents, polyether-based defoaming agents, fatty acid ester-based defoaming agents, and the like. These may be used alone or in combination of two or more. Among these, silicone-based defoaming agents are preferred because of their excellent defoaming effect.

[0050] <Antiseptic and mold preventive agent> There are no particular restrictions on the antiseptic and mold preventive agent, and examples thereof include 1,2-benzisothiazolin-3-one.

[0051] <Rust preventive agent> There are no particular restrictions on the rust preventive agent, and examples thereof include acid sulfite, sodium thiosulfate, and the like. [[ID=十六]] [[ID=十七]]

[0052] [[ID=十八]] [[ID=十九]] [[ID=二十]]<pH adjuster>[[ID=二十一]] [[ID=二十二]]

[0053] [[ID=二十三]] [[ID=二十四]] [[ID=二十五]]There are no particular restrictions on the physical properties of the ink, and it can be appropriately selected according to the purpose. For example, it is preferable that the viscosity, surface tension, pH, etc. are in the following ranges. [[ID=二十六]] [[ID=二十七]]The viscosity of the ink at 25°C is preferably 5 mPa·s or more and 30 mPa·s or less, more preferably 5 mPa·s or more and 25 mPa·s or less, from the viewpoints of improving the printing density and character quality and obtaining good ejection properties. Here, for example, a rotary viscometer (RE-80L manufactured by Toki Sangyo Co., Ltd.) can be used to measure the viscosity. The measurement conditions are as follows: at 25°C, with a standard cone rotor (1°34’×R24), a sample liquid volume of 1.2 mL, a rotation speed of 50 rpm, and it can be measured in 3 minutes. [[ID=二十八]] [[ID=二十九]]The surface tension of the ink is preferably 35 mN / m or less, more preferably 32 mN / m or less, at 25°C, from the viewpoints of the ink being preferably leveled on the recording medium and shortening the drying time of the ink. [[ID=三十]] [[ID=三十一]]The pH of the ink is preferably 7 to 12, more preferably 8 to 11, from the viewpoint of preventing corrosion of the metal members in contact with the liquid. [[ID=三十二]]

[0054] <Recording medium> There are no particular restrictions on the recording medium; plain paper, glossy paper, specialty paper, cloth, etc., can be used, but good image formation is also possible with non-permeable substrates. The aforementioned non-permeable substrate is a substrate having a surface with low water permeability and absorption, and includes materials that have numerous internal cavities but do not open to the outside. More quantitatively, in the Bristow method, from the start of contact for 30 msec 1 / 2 Up to 10 mL / m² of water absorption capacity 2 The following refers to the base material. As the non-permeable substrate, plastic films such as polyvinyl chloride resin film, polyethylene terephthalate (PET) film, polypropylene, polyethylene, and polycarbonate film can be suitably used.

[0055] <Records> The ink recording material of the present invention has an image formed on a recording medium using the ink of the present invention. The data can be recorded and produced as a record using an inkjet recording device and an inkjet recording method.

[0056] Furthermore, in the terminology used in this invention, image formation, recording, printing, and the like are all synonymous. Substrate, recording medium, media, and printed material are all synonymous.

[0057] The recording device and recording method of the present invention will be described below with reference to the drawings. The recording device of the present invention comprises a discharge mechanism for discharging the aqueous composition liquid onto a substrate, and a substrate processing mechanism for processing the substrate from which the aqueous composition liquid has been discharged by the discharge mechanism, wherein the substrate processing mechanism comprises a transport member for transporting the substrate while holding it between them, and a pressing member for bending and deforming a part of the transport member within the region in which the transport member holds the substrate. Furthermore, the recording method of the present invention comprises a discharge step of discharging the aqueous composition liquid onto a substrate, and a substrate processing step of processing the substrate from which the aqueous composition liquid has been discharged by the discharge mechanism, wherein the substrate processing step comprises a pressing step of pressing a pressing member against the transport member within the region in which the transport member holds the substrate, while the substrate is being transported between transport members, thereby bending and deforming a part of the transport member.

[0058] Figure 1 is a schematic diagram illustrating a recording device equipped with a substrate processing mechanism used in the present invention.

[0059] The printing apparatus 1 comprises a loading section 100, a printing section 200, a drying section 300, a sheet processing section 600 configured with the substrate processing mechanism according to the present invention, and a discharge section 400. The printing apparatus 1 applies liquid to a sheet P, which is a substrate, loaded from the loading section 100, performs the required printing in the printing section 200, dries the liquid adhering to the sheet P in the drying section 300, processes the sheet P in the sheet processing section 600, and discharges the sheet P to the discharge section 400.

[0060] The loading unit 100 includes a loading tray 110 on which multiple sheets P are loaded, a feeding device 120 that separates and feeds out the sheets P one by one from the loading tray 110, and a pair of registration rollers 130 that feed the sheets P to the printing unit 200.

[0061] Any type of feeding device can be used for the feeding device 120, including devices using rollers or rollers, or devices utilizing air suction. The sheet P, which is fed from the input tray 110 by the feeding device 120, is sent to the printing unit 200 when the registration roller pair 130 is driven at a predetermined timing after its leading edge reaches the registration roller pair 130.

[0062] The printing unit 200 includes a carrying drum 210 that carries and transports a sheet P on its outer surface, and a liquid dispensing unit 220 which is a means for applying liquid to the sheet P carried on the carrying drum 210. The printing unit 200 also includes a transfer cylinder 201 that receives the fed sheet P and passes it to the carrying drum 210, and a transfer cylinder 202 that passes the sheet P transported by the carrying drum 210 to the drying unit 300.

[0063] The sheet P, which has been transported from the loading section 100 to the printing section 200, is gripped at the tip by a sheet gripper provided on the surface of the transfer cylinder 201 and is transported as the transfer cylinder 201 rotates. The sheet P transported by the transfer cylinder 201 is then transferred to the support drum 210 at a position opposite to the support drum 210.

[0064] Sheet grippers are also provided on the surface of the support drum 210, and the leading edge of the sheet P is gripped by the sheet grippers. Multiple suction holes are dispersed on the surface of the support drum 210, and a suction airflow toward the inside of the support drum 210 is generated at each suction hole by the suction device 211.

[0065] The sheet P, which has been transferred from the transfer drum 201 to the support drum 210, is then gripped at the tip by the sheet gripper and attracted to the surface of the support drum 210 by the suction airflow, and is conveyed as the support drum 210 rotates.

[0066] The liquid ejection unit 220 constitutes an ejection mechanism for ejecting the ink onto the sheet P. It ejects four colors of liquid (ink): C (cyan), M (magenta), Y (yellow), and K (black) to print an image. It is equipped with liquid ejection heads 220C, 220M, 220Y, and 220K, which are means for applying individual liquids for each color. If necessary, liquid ejection heads for ejecting special liquids such as white, gold, and silver, and liquid ejection heads for ejecting processing liquids such as surface coating liquids can also be provided.

[0067] The liquid discharge heads 220C, 220M, 220Y, and 220K of the liquid discharge unit 220 are controlled by drive signals corresponding to the printing information. When the sheet P supported on the support drum 210 passes through the area facing the liquid discharge unit 220, liquid of each color is discharged from the liquid discharge heads 220C, 220M, 220Y, and 220K, and an image corresponding to the printing information is printed.

[0068] The drying unit 300 is a drying device and includes a suction conveying belt 301 that adsorbs and conveys the sheet P transported from the printing unit 200, and a hot air blowing means 302 that blows hot air onto the sheet P transported by the suction conveying belt 301 to dry the liquid. The suction conveying belt 301 is, for example, wrapped between a drive roller 303 and a driven roller 304, and moves in a circular motion by driving the drive roller 303.

[0069] The sheets P transported from the printing unit 200 are received by the suction transport belt 301, then transported through the hot air blowing means 302, and handed over to the sheet processing unit 600, and from the sheet processing unit 600 to the discharge unit 400.

[0070] As the hot air blowing means 302 passes through, the liquid on the sheet P is subjected to a drying process. This causes the water and other liquid components in the liquid to evaporate, and the coloring agent contained in the liquid is fixed onto the sheet P.

[0071] The discharge unit 400 is equipped with a discharge tray 410 on which multiple sheets P are loaded. Sheets P transported from the sheet processing unit 600 are sequentially stacked and held on the discharge tray 410.

[0072] Furthermore, the printing apparatus 1 may also include, for example, a pre-processing unit for performing pre-processing on the sheet P located upstream of the printing unit 200, or a post-processing unit for performing post-processing on the sheet P to which liquid has adhered, located between the sheet processing unit 600 and the output unit 400.

[0073] Examples of pre-processing steps include applying a pre-coating treatment to the sheet P, which involves applying a treatment liquid that reacts with the liquid to suppress bleeding. Examples of post-processing steps include reversing and transporting the sheet printed in the printing unit 200 and sending it back to the printing unit 200 to print on both sides of the sheet P, and binding multiple sheets together.

[0074] Furthermore, the term "recording device" in this application is not limited to inkjet recording devices, nor is it limited to devices equipped with a liquid ejection head that ejects liquid toward a sheet, thereby visualizing meaningful images such as characters and figures through the ejected liquid. It also includes, for example, devices that form patterns that do not have meaning in themselves.

[0075] Furthermore, the ink is not particularly limited as long as it has the viscosity and surface tension to be ejected from the print head, but it is preferable that its viscosity becomes 30 mPa·s or less at room temperature and atmospheric pressure, or when heated or cooled. More specifically, it is a solution, suspension, emulsion, etc. containing a solvent such as water or an organic solvent, a colorant such as a dye or pigment, a polymerizable compound, a resin, a functional material such as a surfactant, a biocompatible material such as DNA, amino acids or proteins, calcium, or an edible material such as a natural pigment, and these can be used, for example, in inkjet inks, surface treatment liquids, etc.

[0076] Furthermore, "recording devices" include serial type devices that move the liquid dispensing head, and line type devices that do not move the liquid dispensing head.

[0077] Furthermore, a "liquid discharge head" is a functional component that discharges or sprays liquid from a discharge hole (nozzle). As an energy source for discharging the liquid, discharge energy generation means such as piezoelectric actuators (multilayer piezoelectric elements or thin-film piezoelectric elements), thermal actuators using electrothermal conversion elements such as heating resistors, and electrostatic actuators consisting of a diaphragm and a counter electrode can be used, but the discharge energy generation means used is not limited.

[0078] Next, the substrate processing mechanism according to the present invention, which constitutes the sheet processing section in the embodiment of the present invention, will be described with reference to Figures 2 and 3. Figure 2 is a side view of the substrate processing mechanism, and Figure 3 is an explanatory diagram of the roller portion.

[0079] The substrate processing mechanism 601 has a conveying member that sandwiches and conveys the substrate. In the configuration shown in Figure 2, the substrate processing mechanism 601 includes a belt pair 602 consisting of an endless upper belt 611 and a lower belt 612 that sandwich and convey the sheet P.

[0080] The upper belt 611 is wrapped around the conveyor roller 621A, the steering control roller 622A, the driven rollers 624A and 625A, and is tensioned by the tension roller 623A.

[0081] The lower belt 612 is wrapped around the conveyor roller 621B, the steering control roller 622B, the driven rollers 624B and 625B, and is tensioned by the tension roller 623B.

[0082] These upper belt 611 and lower belt 612 move in a circular motion in the direction of the arrow as the conveying rollers 621A and 621B are driven to rotate, gripping the sheet P and conveying the sheet P in the conveying direction (direction Y of arrow, hereinafter referred to as "conveying direction Y").

[0083] Here, the tension rollers 623A and 623B are tension-applying means that apply tension to each of the belts 611 and 612 of the belt pair 602, respectively, in a direction that pulls the belt surfaces of the belt pair 602, which are sandwiching the sheet P, in the upstream and downstream directions of the conveying direction Y.

[0084] Furthermore, in the region where the upper belt 611 and lower belt 612 of the belt pair 602 face each other and sandwich the sheet P, there are multiple (in this case, three) curved members called rollers 603 (603A, 603B) that contact the upper belt 611 or lower belt 612 of the belt pair 602 and are arranged along the conveying direction Y. The rollers 603 deform a portion of the belt pair 602 into a curved shape (curved deformation).

[0085] The roller 603 incorporates a heater 604 as a heat generating means and is a heating roller that also serves as a heating means for heating the area of ​​the sheet P that is pressed against the roller 603 via the belt pair 602 and is being bent and deformed.

[0086] Here, rollers 603A and 603B are arranged alternately within the region where the surfaces of the upper belt 611 and the lower belt 612 face each other.

[0087] Then, by pressing the lower belt 612 side of the belt pair 602 against the circumferential surface 603a of the roller 603A (see Figure 3), the belt pair 602 is curved and deformed so that it becomes convex upwards. Also, by pressing the upper belt 611 side of the belt pair 602 against the circumferential surface 603a of the roller 603B, the belt pair 602 is curved and deformed so that it becomes convex downwards.

[0088] In other words, in the conveying direction of the sheet P, rollers 603A that curve and deform one side of the sheet P so that it becomes convex, and rollers 603B that curve and deform the other side of the sheet P so that it becomes convex, are arranged alternately. Alternatively, roller 603B can be placed at the upstream end, and rollers 603A and 603B can be arranged alternately.

[0089] Then, facing the circumferential surface (curved surface) of the roller 603, a roller-shaped first pressing member 606 and a similarly roller-shaped second pressing member 607 are arranged along the conveying direction P, constituting a pressing means that presses the belt pair 602 against the circumferential surface of the roller 603. Here, relatively, the first pressing member 606 is positioned on the upstream side of the conveying direction P, and the second pressing member 607 is positioned on the downstream side of the conveying direction P.

[0090] The first pressing member 606 determines the pressing start position (winding start position) where the belt pair 602 begins to contact the circumferential surface 603a of the roller 603. The second pressing member 607 determines the pressing end position (winding end position) where the belt pair 602 separates from the circumferential surface 603a of the roller 603.

[0091] Here, among the adjacent curved members (rollers 603) in the conveying direction Y, there is a gap between the second pressing member 607 facing the upstream roller 603 and the first pressing member 606 facing the downstream roller 603. Furthermore, the upstream roller 603 and the downstream roller 603 are positioned at a distance such that the belt pair 602 does not curve between the upstream second pressing member 607 and the downstream first pressing member 606.

[0092] This allows the stress on the belt pair 602, which has curved to conform to the circumferential surface of the roller 603, to be released, thereby improving adhesion to the next roller 603.

[0093] Furthermore, the first pressing member 606 and the second pressing member 607 are arranged to be movable (advance and retract) relative to the circumferential surface of the roller 603. This allows the wrapping angle θ of the belt pair 602 around the circumferential surface of the roller 603 to be changed according to the thickness (type) of the sheet P, the amount of liquid applied, etc.

[0094] As described above, the substrate processing mechanism 601 includes a pair of belts 602 that transport the sheet P while sandwiching it, and a pressing member (pressing member) that curves and deforms a part of the pair of belts 602 within the region where the pair of belts 602 holds the sheet P. By transporting the sheet P sandwiched between the pair of belts 602 and curving and deforming a part of the pair of belts 602, the sheet P and the pair of belts 602 come into contact, the image is rubbed, and the frictional heat promotes the formation of a resin emulsion film in the ink, making the image surface smoother, which increases glossiness and improves image density, as well as improving abrasiveness. [Examples]

[0095] The present invention will be described in more detail below with reference to examples and comparative examples, but the present invention is not limited in any way by these examples. Note that Example 6 refers to Reference Example 6, which is not included in the present invention.

[0096] (Preparation Example 1) -Preparation of a dispersion of magenta pigment-containing polymer microparticles- <Preparation of Polymer Solution A> After thoroughly purging a 1 L flask equipped with a mechanical stirrer, thermometer, nitrogen gas inlet tube, reflux tube, and dropping funnel with nitrogen gas, 11.2 g of styrene, 2.8 g of acrylic acid, 12.0 g of lauryl methacrylate, 4.0 g of polyethylene glycol methacrylate, 4.0 g of styrene macromer, and 0.4 g of mercaptoethanol were mixed and the mixture was heated to 65°C. Next, a mixed solution of 100.8 g of styrene, 25.2 g of acrylic acid, 108.0 g of lauryl methacrylate, 36.0 g of polyethylene glycol methacrylate, 60.0 g of hydroxyl ethyl methacrylate, 36.0 g of styrene macromer, 3.6 g of mercaptoethanol, 2.4 g of azobismethylvaleronitrile, and 18 g of methyl ethyl ketone was added dropwise to the flask over 2.5 hours. After the dropwise addition, a mixed solution of 0.8 g of azobismethylvaleronitrile and 18 g of methyl ethyl ketone was added dropwise to the flask over 0.5 hours. After aging at 65°C for 1 hour, 0.8 g of azobismethylvaleronitrile was added, and the mixture was aged for another hour. After the reaction was complete, 364 g of methyl ethyl ketone was added to the flask to obtain 800 g of polymer solution A with a concentration of 50% by mass.

[0097] <Preparation of Pigment-Containing Polymer Microparticle Dispersion> 28 g of polymer solution A, 42 g of CI pigment red 122, 13.6 g of 1 mol / L potassium hydroxide aqueous solution, 20 g of methyl ethyl ketone, and 13.6 g of deionized water were thoroughly mixed and then kneaded using a roll mill. The resulting paste was added to 200 g of pure water and thoroughly mixed. Methyl ethyl ketone and water were then removed using an evaporator. To further remove coarse particles, the dispersion was pressure filtered through a polyvinylidene fluoride membrane filter with an average pore size of 5.0 μm to obtain a magenta pigment-containing polymer microparticle dispersion containing 15% by mass of pigment and 20% by mass of solids. The average particle size (D50) of the polymer microparticles in the obtained magenta pigment-containing polymer microparticle dispersion was measured to be 108 nm. The average particle size (D50) was measured using a particle size distribution analyzer (NanoTrack UPA-EX150, manufactured by Nikkiso Co., Ltd.).

[0098] (Preparation Example 2) -Preparation of a dispersion of cyanide pigment- containing polymer microparticles A cyan pigment-containing polymer fine particle dispersion was prepared in the same manner as in Preparation Example 1, except that CI Pigment Red 122 as the pigment was replaced with a phthalocyanine pigment (CI Pigment Blue 15:3). The average particle size (D50) of the polymer microparticles in the obtained cyanide pigment-containing polymer microparticle dispersion was 93 nm, as measured using a particle size distribution analyzer (NanoTrack UPA-EX150, manufactured by Nikkiso Co., Ltd.).

[0099] (Preparation Example 3) -Preparation of a dispersion of yellow pigment-containing polymer microparticles- A dispersion of polymer fine particles containing yellow pigment was prepared in the same manner as in Preparation Example 1, except that CI Pigment Red 122 as the pigment was replaced with a monoazo yellow pigment (CI Pigment Yellow 74). The average particle size (D50) of the polymer microparticles in the obtained yellow pigment-containing polymer microparticle dispersion was 90 nm, as measured using a particle size distribution analyzer (NanoTrack UPA-EX150, manufactured by Nikkiso Co., Ltd.).

[0100] (Preparation Example 4) -Preparation of a dispersion of polymer microparticles containing carbon black pigment- A dispersion of polymer fine particles containing carbon black pigment was prepared in the same manner as in Preparation Example 1, except that CI Pigment Red 122 as the pigment was replaced with carbon black (Degsa, FW100). The average particle size (D50) of the polymer microparticles in the obtained carbon black pigment-containing polymer microparticle dispersion was 104 nm, as measured using a particle size distribution analyzer (NanoTrack UPA-EX150, manufactured by Nikkiso Co., Ltd.).

[0101] -Preparation of styrene acrylic resin A- As the olefin polymer (1), 1000g of propylene-butene-ethylene ternary copolymer (Bestplast 750, manufactured by Degussa Japan), 100g of maleic anhydride-modified polypropylene wax (Highwax NP0555A, manufactured by Mitsui Chemicals, Inc.), and 40g of potassium oleate (KS Soap, manufactured by Kao Corporation) were mixed and supplied from the hopper of a twin-screw extruder (Ikegai Iron Works, PCM-300, L / D=40) at a rate of 3000g / hour. A 17% aqueous solution of potassium hydroxide was continuously supplied at a rate of 120g / hour (4% of the total) from a supply port provided in the vent section of the extruder, and the mixture was continuously extruded at a superheating temperature of 200°C. The extruded resin mixture was cooled to 90°C in a jacketed static mixer installed in the extruder, and then added to 80°C hot water to obtain an aqueous dispersion (2) of an olefin polymer with a yield of 99%, a solids content of 40%, and a pH of 12. 217.3 g of deionized water and 2.3 g of sodium dodecylsulfonate, an anionic dispersant, were charged into a separable flask equipped with a stirrer, reflux condenser, and thermometer, and the mixture was stirred until homogeneous. Under stirring, 0.65 g of 25% aqueous ammonia was added, followed by 25 g of the aqueous dispersion (2) of the olefin polymer, and the mixture was stirred until homogeneous. Further, under stirring, a mixed solution of 10.2 g of styrene and 12.4 g of butyl acrylate was added, and nitrogen bubbling was performed for 1 hour and 30 minutes while stirring to remove dissolved oxygen from the system. After bubbling, the temperature was raised to 70°C. When the internal temperature reached 70°C, 0.32 g of a 10% aqueous solution of 4,4'-azobis(4-cyanopentanoic acid) was added as a water-soluble radical initiator, and polymerization was completed after 6 hours. The Tg of this water-dispersible styrene-acrylic resin A was 90°C, and the particle size D50 was 120 nm.

[0102] -Preparation of styrene acrylic resin B- In a separable flask equipped with a stirrer, reflux condenser, and thermometer, 250 g of deionized water and 1.04 g of [1-(O-ethylzanthyl)ethyl]benzene and 1.69 g of ethyl acrylate, which are addition-cleavage chain transfer agents (RAFT agents) with living radical polymerization properties, were charged. Nitrogen bubbling was performed for 1 hour and 30 minutes to remove dissolved oxygen from the liquid. After bubbling, the temperature was raised to 70°C while stirring with a stirrer. When the internal temperature reached 70°C, 5 g of 10% sodium persulfate aqueous solution was added as a water-soluble radical initiator. After 20 minutes, a mixture of 32.06 g of ethyl acrylate and 11.25 g of methacrylic acid was added dropwise so that it would be completed over 3 hours. After the dropwise addition was completed, the mixture was aged at 70°C for 4 hours to complete the polymerization of the aqueous dispersion (1). 203.4 g of deionized water and 14.8 g of aqueous dispersion (1) were charged into a separable flask equipped with a stirrer, reflux condenser, and thermometer, and the mixture was stirred until homogeneous. Under stirring, 0.65 g of 25% aqueous ammonia was added to obtain a colorless, transparent aqueous resin solution. 25 g of ChemiPearl W400 (low molecular weight polyolefin emulsion, 40% solids, manufactured by Mitsui Chemicals, Inc.) was added, and the mixture was stirred until homogeneous. Further stirring, 22.5 g of styrene was added, and nitrogen bubbling was performed for 1 hour and 30 minutes while stirring to remove dissolved oxygen from the system. After bubbling was complete, the temperature was raised to 70°C. When the internal temperature reached 70°C, 0.32 g of a 10% aqueous solution of 4,4'-azobis(4-cyanopentanoic acid) was added as a water-soluble radical initiator, and polymerization was completed after 6 hours. The Tg of the obtained water-dispersible styrene-acrylic resin B was 65°C, and the particle size D50 was 100 nm.

[0103] -Preparation of recording ink- The recording inks were manufactured using the following procedure. First, the solvent, surfactant, resin, wax, and water shown in Table 1 below were mixed (by mass) and stirred for 1 hour to ensure uniform mixing. A pigment dispersion was added to this mixture and stirred for 1 hour. This dispersion was then pressure filtered through a polyvinylidene fluoride membrane filter with an average pore size of 5.0 μm to remove coarse particles and debris, thereby producing each recording ink.

[0104] [Image formation] Using the recording device shown in Figure 1, images were recorded on both sides of a recording medium, and the images were evaluated. As the recording medium, a roll of Lumi Art Gloss 90gsm coated paper was set, and a solid image was recorded at a resolution of 1,200 dpi. At that time, transport was stopped after passing through the drying section 300, the printed image was taken out, and the image density (after drying) was measured. The image density (after rubbing) of the printed image after passing through the processing section 600 was also measured. In addition, the blocking of the printed image discharged to the paper discharge section 400 was measured.

[0105] <Image density of coated paper> Image density was measured on the printed materials after drying and rubbing using a reflective color spectrophotometer (X-Rite), and evaluated according to the following criteria.

[0106] [Evaluation Criteria] ◎: Black: 1.6 or higher Yellow: 1.3 or higher Magenta: 1.4 or higher Cyan: 1.6 or higher ○: Black: 1.3 or higher, less than 1.6 Yellow: 1.0 or higher, less than 1.3 Magenta: 1.1 or higher, less than 1.4 Cyan: 1.3 or higher, less than 1.6 △: Black: Less than 1.3 Yellow: Less than 1.0 Magenta: Less than 1.1 Cyan: Less than 1.3

[0107] (blocking) The degree to which the recorded images adhered to each other and the image transfer (offset) were visually inspected, and "blocking" was evaluated based on the following evaluation criteria. A ○ or △ rating indicates a passing grade. [Evaluation Criteria] ○: No image transfer △: There is a slight stickiness when peeling it off, but no image transfer occurs. ×: Image transcription is present.

[0108] <Abrasion resistance> For the obtained images, the images were rubbed 20 times using 1.2mm square pieces of paper (Lumi Art Gloss 90gsm), and the ink adhesion to the paper was measured using a reflective color spectrophotometer (X-Rite). The density was calculated by subtracting the background color of the rubbed paper, and the "rubbing ability" was evaluated based on the following evaluation criteria. ◎, ○, and △ are considered passing grades. [Evaluation Criteria] ◎: Transfer concentration less than 0.05 ○: Transcription concentration is 0.05 or higher and less than 0.10 △: Transcription concentration is 0.10 or higher but less than 0.25 ×: Transfer concentration is 0.25 or higher

[0109] <Discharge stability> Using a RICOH SG5100 printer, 200 consecutive charts were printed on MyPaper (manufactured by NBS Ricoh Co., Ltd.) using Microsoft Word 2000, with each color filling 5% of the A4 size paper area with a solid color. The print quality was evaluated based on the ejection irregularities of each nozzle after printing. The printing mode used was the "Plain Paper - Fast" mode, modified from the user settings for plain paper in the printer's included driver to "No Color Correction". [Evaluation Criteria] ○: No discharge irregularities △: Slightly irregular discharge ×: Discharge is irregular or there are parts that are not discharged.

[0110] The results are shown in Table 1.

[0111] [Table 1]

[0112] The abbreviations used in Table 1 are as follows: • M100 (N,N-dimethyl-β-ethoxypropionamide: manufactured by Idemitsu Kosan Co., Ltd., product name) • B100 (N,N-dimethyl-β-butoxypropionamide: manufactured by Idemitsu Kosan Co., Ltd., product name) • EHO (3-ethyl-3-hydroxymethyloxetane: manufactured by Ube Industries, Ltd., trade name) • 1,2-PD (1,2-propanediol: manufactured by ADEKA Corporation) • 1,2-BD (1,2-butanediol: manufactured by Shinko Organic Chemical Industry Co., Ltd.) Gly (glycerin) • TEGO Wet 270 (Polyether-modified siloxane surfactant: Manufactured by Evonik, brand name) • Surfinol 465 (nonionic surfactant: manufactured by Air Product and Chemicals, Inc., brand name) • AQUACER 532 (Wax emulsion manufactured by BIC Chemie, 45% non-volatile content, product name) • AQUACER 552 (Wax emulsion manufactured by BIC Chemie, 35% non-volatile content, product name) • AQUACER 1547 (Wax emulsion manufactured by BIC Chemie, 35% non-volatile content, product name) [Explanation of symbols]

[0113] 1 Printing device 100 Loading area 110 Loading Tray 120 Feeding device 130 Resist Roller vs. 200 Printing Department 201 Watashi-do 202 Transfer of body 210 Carrying drums 211 Suction device 220 Liquid discharge part 220C, 220M, 220Y, 220K Liquid Dispensing Head 300 Drying section 301 Suction conveying belt 302 Hot air blowing means 303 Drive Roller 304 Driven roller 400 Loading section 410 Discharge Tray 600 Sheet Processing Unit P Sheet 601 Sheet Processing Mechanism 602 Belt vs. 603, 603A, 603B pressing rollers 603a Peripheral surface 604 Heater 606, 607 Opposing rollers (opposing members) 608 Holder component 611 Upper belt 612 Lower belt 621A, 621B Conveyor Rollers 622A, 622B Steering control rollers 623A, 623B Tension Rollers 624A, 625A, 624B, 625B Driven rollers [Prior art documents] [Patent Documents]

[0114] [Patent Document 1] Japanese Patent Publication No. 2017-88846

Claims

1. An aqueous composition liquid discharged onto a substrate, The aqueous composition solution comprises water, a pigment, and a resin emulsion, wherein the resin emulsion contains resin emulsion A having a glass transition temperature (Tg) of 80°C or higher and resin emulsion B having a glass transition temperature (Tg) of 40 to 65°C. The ratio of resin emulsion A to resin emulsion B in the aqueous composition is 2 to 5 as the mass ratio of resin emulsion A to resin emulsion B. An aqueous composition liquid used in a recording device having a discharge mechanism for discharging the aqueous composition liquid onto a substrate, and a substrate processing mechanism for processing the substrate from which the aqueous composition liquid has been discharged by the discharge mechanism, wherein the substrate processing mechanism comprises a transport member for transporting the substrate while holding it, and a pressing member for bending and deforming a part of the transport member within the region in which the transport member holds the substrate.

2. The aqueous composition liquid according to claim 1, further characterized by containing wax.

Images