Method for producing ink jet-recorded material

Abstract

To provide a method for producing ink jet-recorded materials that enables suppression of paper dust generation and production of high-quality recorded materials even in cases where cutting with a cutting blade is performed after repeated image recording.SOLUTION: A method for producing an ink jet-recorded material having a step of recording an image by applying an aqueous ink to a recording medium by an ink jet system, further having a processing step of cutting a region to which a liquid containing an antistatic agent has been applied, with a cutting blade, after applying the liquid containing the antistatic agent to the recording medium.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a method for producing an inkjet recorded matter. [Background technology]

[0002] An inkjet recording apparatus is an apparatus that records an image on a recording medium by ejecting minute ink droplets from the nozzles of a recording head. In recent years, there has been a demand for inkjet recording apparatuses to be able to record images on recording media that have low absorbency for water-based inks, such as art paper with a coated layer, and on non-absorbent recording media that barely absorb water-based inks, such as plastic film. In addition, the recorded material obtained by recording an image on a recording medium may be processed, such as by cutting or clipping with a cutting blade, to produce a final product depending on the purpose and method of use.

[0003] For example, a printing system has been proposed that prints an image based on image data and has a cutting function that cuts out the image at a predetermined interval from the contour line of the target image (Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2005-14594 Summary of the Invention [Problem to be solved by the invention]

[0005] The present inventors have studied the printing system proposed in Patent Document 1. As a result, they have found that when a recorded material is cut with a cutting blade after repeatedly recording images, dust (paper powder) generated from the cut surface scatters and adheres to the recorded material, which can easily degrade the quality of the recorded material.

[0006] Therefore, an object of the present invention is to provide a method for producing inkjet recorded matter that suppresses the generation of paper dust and enables the production of high-quality recorded matter, even when repeatedly recording images and then cutting with a cutting blade. [Means for solving the problem]

[0007] That is, according to the present invention, there is provided a method for producing an inkjet recorded matter, which comprises a step of applying an aqueous ink to a recording medium by an inkjet system to record an image, and further comprises a processing step of applying a liquid containing a charge inhibitor to the recording medium and then cutting, with a cutting blade, the area where the liquid containing the charge inhibitor has been applied. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a method for producing inkjet recorded matter, which can suppress the generation of paper dust and produce high-quality recorded matter, even when cutting with a cutting blade after repeatedly recording images. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a schematic diagram illustrating an example of an inkjet recording apparatus. [Figure 2] FIG. 1 is a perspective view illustrating an example of a liquid deposition device. [Figure 3] FIG. 2 is a cross-sectional perspective view showing an example of a discharge element substrate. [Figure 4] FIG. 2 is a schematic diagram showing an example of a liquid supply system. DETAILED DESCRIPTION OF THE INVENTION

[0010] The present invention will be described in further detail below with reference to preferred embodiments. In the present invention, when the compound is a salt, the salt is present in the ink as dissociated ions, but for convenience it will be expressed as "containing a salt." In addition, aqueous inkjet ink and reaction liquid may be simply referred to as "ink" and "reaction liquid." Physical property values ​​are values ​​at room temperature (25°C) unless otherwise specified. When "(meth)acrylic acid" and "(meth)acrylate" are written, they mean "acrylic acid, methacrylic acid" and "acrylate, methacrylate," respectively.

[0011] The present inventors have investigated the causes of degradation of the quality of recorded materials bearing images recorded by an inkjet method due to dust such as paper dust. As a result, they have found that paper dust is generated when a recording medium bearing an image recorded thereon is cut with a cutting blade, and that static electricity generated by friction between the cutting blade and the recording medium makes the paper dust more likely to adhere to the recorded material. After further investigation, the present inventors have found that applying a liquid containing a charge inhibitor to the recording medium and then cutting the area where the liquid containing the charge inhibitor has been applied with the cutting blade can suppress the generation of static electricity and prevent dust such as paper dust from adhering to the recorded material, thereby arriving at the present invention.

[0012] <Method of manufacturing inkjet recording material> The method for producing an inkjet recorded matter of the present invention includes a step of applying an aqueous ink to a recording medium by an inkjet system to record an image. The method for producing an inkjet recorded matter of the present invention further includes a processing step of applying a liquid containing a charge inhibitor to the recording medium and then cutting the area where the liquid containing the charge inhibitor has been applied with a cutting blade. The method for producing an inkjet recorded matter of the present invention (hereinafter also referred to as "production method for a recorded matter") will be described in detail below.

[0013] (Inkjet recording device) The inkjet recording apparatus will be described in detail below with reference to the drawings. FIG. 1 is a schematic diagram showing an example of an inkjet recording apparatus. An inkjet recording apparatus that can be used in the method for producing a recorded matter of the present invention is an inkjet recording apparatus that records an image on a recording medium wound in a roll using a reaction liquid containing a reactant that reacts with the ink, a first ink, and a second ink. The X direction, Y direction, and Z direction respectively indicate the width direction (total length direction), depth direction, and height direction of the inkjet recording apparatus. The recording medium is transported in the X direction.

[0014] 1 includes a first recording unit 1100, a first heating unit 2000, a first cooling unit 3000, a second recording unit 1200, a second heating unit 2300, a second cooling unit 3300, and a winding unit 4000. In the first recording unit 1100, a first liquid application device 1101 applies various liquids, including a first ink, to a long recording medium 1000 that is transported from a paper feeder 1400 while being supported by a transport member 1300. In the first heating unit 2000, the recording medium 1000 is aligned with a first transport member 2200 to maintain tension, and the liquid applied to the recording medium 1000 is heated by a first heating device 2100, evaporating volatile components such as water in the liquid and drying it. The recording medium 1000 is then cooled by the first cooling member 3100 while supported by the first transport member 3100 of the first cooling unit 3000. Next, in the second recording unit 1200, various liquids including the second ink are applied by the second liquid application device 1201 in the same manner as in the case of various liquids including the first ink. In the second heating unit 2300, the recording medium 1000 is aligned along the second transport member 2500 and tension is maintained, while the liquid applied to the recording medium 1000 is heated by the second heating device 2400, evaporating volatile components such as water in the liquid and drying it. Next, the recording medium 1000 is cooled by the second cooling member 3400 while supported by the second transport member 3500 of the second cooling unit 3300. The recording medium 1000 with the recorded image is transported in the winding unit 4000 while supported by the support member 4100, and then wound up by the winding device 4200.

[0015] Any recording medium may be used as the recording medium 1000. For example, recording media that have ink absorption (permeability) such as recording media without a coating layer, such as plain paper, uncoated paper, and synthetic paper, and recording media with a coating layer, such as printing paper, glossy paper, and art paper, may be used. Also, recording media that do not have permeability, such as films or sheets made of resin materials such as polyvinyl chloride (PVC) and polyethylene terephthalate (PET), may be used. The basis weight (g / m) of the recording medium 1000 may be 1 / 2 sq. m. 2 ) is 30g / m 2 More than 500g / m 2 Preferably, it is 50 g / m or less. 2 More than 450g / m 2 It is more preferable that the recording medium 1000 is in the form of a roll of long recording medium.

[0016] [Recording Department] The recording unit includes a first recording unit 1100 that applies a liquid containing a first ink, and a second recording unit 1200 that applies a liquid containing a second ink. The first recording unit 1100 includes a first liquid applying device 1101. The first liquid applying device 1101 includes a first reaction liquid applying device 1102 and a first ink applying device 1103. The second recording unit 1200 includes a second liquid applying device 1201. The second liquid applying device 1201 includes a second reaction liquid applying device 1202 and a second ink applying device 1203. The first reaction liquid applying device 1102 and the second reaction liquid applying device 1202 shown in FIG. 1 are examples of units that use inkjet-type ejection heads. Alternatively, the reaction liquid applying device may be configured using a gravure coater, offset coater, die coater, blade coater, or the like. The application methods of the first reaction liquid application device 1102 and the second reaction liquid application device 1202 may be the same or different. The application of the reaction liquid by the first reaction liquid application device 1102 and the second reaction liquid application device 1202 may be either before or after application of the ink on the recording medium 1000, as long as it can contact the ink. However, in order to record high-quality images on various recording media with different liquid absorption characteristics, it is preferable to apply the reaction liquid before application of the ink. The first ink application device 1103 and the second ink application device 1203 use inkjet-type ejection heads (recording heads). Examples of the ejection methods of the ejection heads serving as the first liquid application device 1101 and the second liquid application device 1201 include a method of ejecting liquid by generating film boiling in the liquid using an electrothermal converter to form bubbles, and a method of ejecting liquid using an electromechanical converter. The ejection methods of the first ink application device 1103 and the second ink application device 1203 may be the same or different. The first reaction liquid used in combination with the first ink and the second reaction liquid used in combination with the second ink may be the same or different. The reaction liquid or ink itself may be a liquid containing a charge inhibitor, or a liquid containing a charge inhibitor separate from the reaction liquid or ink may be used.

[0017] The first liquid deposition device 1101 and the second liquid deposition device 1201 are line heads extending in the Y direction, and have ejection ports arranged in a range that covers the image recording area of ​​the widest usable recording medium. The ejection heads have an ejection port surface 1107 (FIG. 3) on which ejection ports are formed on their lower side (the recording medium 1000 side), and the ejection port surface faces the recording medium 1000 at a very small distance of about several millimeters.

[0018] The following description will be given taking as an example a case where the first ink is ejected from the first ink applicator 1103 and the second ink is ejected from the second ink applicator 1203. A plurality of second ink applicators 1203 may be provided to apply ink of each color to the recording medium 1000. For example, when yellow ink, magenta ink, cyan ink, and black ink are used as the second ink to record an image of each color, four second ink applicators 1203 that eject the above four types of ink are arranged in the X direction. The color tones of the first ink and second ink are not limited to those described above, and the order in which the inks are applied is also not limited to those described above. Hereinafter, ink and reaction liquid may be collectively referred to as "liquid."

[0019] Fig. 2 is a perspective view showing an example of a liquid deposition device. The first liquid deposition device 1101 and the second liquid deposition device 1201 can have the same configuration, so the following description will take the first liquid deposition device 1101 as an example. The first liquid deposition device 1101 shown in Fig. 2 is a line head, and has a plurality of ejection element substrates 1104, each having an ejection port array, arranged in a straight line. The ejection element substrate 1104 has a plurality of ejection port arrays arranged thereon.

[0020] FIG. 3 is a cross-sectional perspective view showing an example of an ejection element substrate. The ejection element substrate 1104 shown in FIG. 3 includes an ejection port forming member 1106 having ejection ports 1105 formed therein, and a substrate 1108 on which ejection elements (not shown) are disposed. The ejection port forming member 1106 and the substrate 1108 are stacked together to form a first flow path 1109 and a second flow path 1110 through which liquid flows. The first flow path 1109 is a region extending from an inlet 1113, through which liquid flows from an inlet channel 1111, to a portion between the ejection port 1105 and the ejection element (the liquid chamber 1508 in FIG. 4). The second flow path 1110 is a region extending from a portion between the ejection port 1105 and the ejection element (the liquid chamber 1508 in FIG. 4) to an outlet 1114 through which liquid flows out to an outlet channel 1112. For example, by creating a pressure difference between the inlet 1113 and the outlet 1114, such as a high-pressure inlet 1113 and a low-pressure outlet 1114, liquid can be made to flow from the high-pressure side to the low-pressure side (in the direction of the arrow in FIG. 3). The liquid that has passed through the inlet 1111 and the inlet 1113 enters the first flow path 1109. Then, the liquid that has passed through the portion between the ejection port 1105 and the ejection element (liquid chamber 1508 in FIG. 4) flows through the second flow path 1110 and the outlet 1114 to the outlet 1112.

[0021] [Supply system] FIG. 4 is a schematic diagram showing an example of a supply system for a liquid such as ink. The supply unit 1500 of the first liquid deposition device 1101 shown in FIG. 4 is configured to include a first circulation pump (high-pressure side) 1501, a first circulation pump (low-pressure side) 1502, a sub-tank 1503, and a second circulation pump 1505. The sub-tank 1503, which is connected to a main tank 1504 serving as a liquid storage unit, has an air vent (not shown) and is capable of discharging air bubbles mixed in the liquid to the outside of the circulation system. The sub-tank 1503 is also connected to a refill pump 1506. The first liquid deposition device 1101 consumes liquid by discharging (discharging) the liquid from the discharge port for image recording, suction recovery, etc. The refill pump 1506 transfers an amount of liquid corresponding to the consumed amount from the main tank 1504 to the sub-tank 1503.

[0022] The first circulation pump (high pressure side) 1501 and the first circulation pump (low pressure side) 1502 cause the liquid in the first liquid deposition device 1101, which is discharged from a connection part (inlet part) 1507, to flow into a sub-tank 1503. It is preferable to use a positive displacement pump having a quantitative liquid delivery capacity as the first circulation pump (high pressure side) 1501, the first circulation pump (low pressure side) 1502, and the second circulation pump 1505. Examples of such a positive displacement pump include a tube pump, a gear pump, a diaphragm pump, and a syringe pump. When the ejection element substrate 1104 is driven, the first circulation pump (high pressure side) 1501 and the first circulation pump (low pressure side) 1502 can cause the liquid to flow from a common inlet channel 1514 toward a common outlet channel 1515.

[0023] The negative pressure control unit 1509 has two pressure adjustment mechanisms set to different control pressures. The pressure adjustment mechanism (high pressure side) 1510 and the pressure adjustment mechanism (low pressure side) 1511 are each connected to a common inflow channel 1514 and a common outflow channel 1515 in the ejection element substrate 1104 via a supply unit 1513 provided with a filter 1512 that removes foreign matter from the liquid. The ejection element substrate 1104 is provided with the common inflow channel 1514, the common outflow channel 1515, as well as inflow channels 1111 and outflow channels 1112 that communicate with the liquid chamber 1508, which is the portion between the ejection port 1105 (FIG. 3) and the ejection element (not shown). Since the inlet channel 1111 and the outlet channel 1112 are respectively connected to the common inlet channel 1514 and the common outlet channel 1515, a flow (arrow in FIG. 4) occurs in which part of the liquid flows from the common inlet channel 1514 through the inside of the liquid chamber 1508 to the common outlet channel 1515. The arrows in FIG. 3 indicate the flow of liquid inside the liquid chamber 1508. That is, as shown in FIG. 3, the liquid in the first flow channel 1109 flows to the second flow channel 1110 via the gap between the ejection port 1105 and the ejection element.

[0024] 4, a pressure adjustment mechanism (high pressure side) 1510 is connected to the common inlet channel 1514, and a pressure adjustment mechanism (low pressure side) 1511 is connected to the common outlet channel 1515, so that a pressure difference occurs between the inlet channel 1111 and the outlet channel 1112. As a result, a pressure difference also occurs between an inlet 1113 (FIG. 3) communicating with the inlet channel 1111 and an outlet 1114 (FIG. 3) communicating with the outlet channel 1112. When liquid is caused to flow by the pressure difference between the inlet 1113 and the outlet 1114, it is preferable to control the flow velocity (mm / s) of the liquid to be 0.1 mm / s or more and 10.0 mm / s or less.

[0025] [Transport system] As shown in FIG. 1, the first recording unit 1100 includes a first liquid deposition device 1101 and a transport member 1300 that transports the recording medium 1000. The first liquid deposition device 1101 deposits reaction liquid and ink at desired positions on the recording medium 1000 transported by the transport member 1300. The first reaction liquid deposition device 1102 and the first ink deposition device 1103 receive image signals from the recording data and deposit the necessary reaction liquid and ink at each position. The second recording unit 1200 includes a second liquid deposition device 1201 and a transport member 1300 that transports the recording medium 1000, and deposits the necessary reaction liquid and ink at each position, similar to the first recording unit 1100. While FIG. 1 shows the transport member 1300 in the form of a transport roller, it may also be a spur, belt, support plate, or the like, as long as it has the function of transporting the recording medium 1000. The shape and size of the transport members 1300 at various locations within the device can be appropriately set depending on the location where they are installed. In order to transport the roll-shaped recording medium 1000 with high accuracy, it is preferable to position the transport member 1300 so that the recording medium 1000 is curved, thereby maintaining a state in which the recording medium 1000 is under appropriate tension.

[0026] [Heating section] As shown in Fig. 1, the first heating section 2000 is configured to include a first heating device 2100 and a first conveying member 2200. Similarly, the second heating section 2300 is configured to include a second heating device 2400 and a second conveying member 2500. In the first heating section 2000 and the second heating section 2300 shown in Fig. 1, the recording medium 1000 is conveyed with the recording surface facing downward in the vertical direction. The recording medium 1000, to which the reaction liquid and ink have been applied and on which an image has been recorded, is heated by the first heating device 2100 and the second drying device 2400 while being conveyed by the first conveying member 2200 and the second conveying member 2500, thereby evaporating and drying the liquid components of the image.

[0027] The first heating device 2100 and the second heating device 2400 may have any configuration as long as they can heat the recording medium 1000, and various conventionally known devices such as hot air dryers and heaters can be used. Among these, the use of non-contact heaters such as electric heating wires and infrared heaters is preferable from the standpoint of safety and energy efficiency. Furthermore, if a mechanism that incorporates a fan to spray heated gas onto the recording medium 1000 and sends hot air is used, the drying efficiency can be easily improved.

[0028] The heating method may be from the side of the recording medium 1000 to which the reaction liquid and ink have been applied (the recording surface (front side)), from the back side, or from both sides. The first conveying member 2200 and the second conveying member 2500 may be provided with a heating function. The heating temperature is preferably set so as to quickly evaporate the liquid components and to prevent over-drying in order to prevent deformation of the recording medium 1000. The temperature of the drying means can be set so that the recording medium reaches a desired temperature, taking into account the conveying speed and ambient temperature. Specifically, the temperature of the drying means (such as hot air) is preferably set to 40°C or higher and 100°C or lower, and more preferably 60°C or higher and 80°C or lower. Furthermore, when heated gas is blown to heat the recording medium 1000, the air speed is preferably set to 1 m / s or higher and 100 m / s or lower. The temperature of the air, such as hot air, can be measured using a K-type thermocouple thermometer. A specific example of a measuring device is the product name "AD-5605H" (manufactured by A&D).

[0029] [Cooling section] The first cooling unit 3000 includes a first cooling member 3100 and a first transport member 3200, while the second cooling unit 3300 includes a second cooling member 3400 and a second transport member 3500 (FIG. 1). The first cooling unit 3000 and the second cooling unit 3300 cool the recording medium 1000, which has been heated to a high temperature after passing through the first heating unit 2000 and the second heating unit 2300. The first cooling member 3100 and the second cooling member 3400 may have any configuration capable of cooling the recording medium 1000, and methods such as air cooling and water cooling can be used. Among these, blowing unheated gas is preferable from the standpoint of safety and energy efficiency. Furthermore, incorporating a fan to spray gas onto the recording medium 1000 and using a blowing mechanism can easily improve cooling efficiency. The temperature of the cooling means can be set so that the image on the recording medium reaches the desired temperature, taking into account the transport speed and ambient temperature. Specifically, the temperature of the cooling means (such as air blower) is preferably 20° C. or higher and 60° C. or lower, and more preferably 25° C. or higher and 50° C. or lower. When cooling by blowing gas, the air speed is preferably 1 m / s or higher and 100 m / s or lower.

[0030] [Winding section] After an image is recorded, the recording medium 1000 is stored in a winding section 4000 (FIG. 1). After recording is performed in the first recording section 1100, the recording medium 1000 passes through the first heating section 2000 and the first cooling section 3000. After recording is performed in the second recording section 1200, the recording medium 1000 passes through the second heating section 2300 and the second cooling section 2200 and is then transported by a transport member 4100. The recording medium 1100 is finally stored in a state where it has been wound into a roll by a winding device 4200. Two or more winding devices 4200 may be provided to store different recorded materials, etc.

[0031] (Liquid containing antistatic agent) The method for producing a recorded matter of the present invention includes a processing step of applying a liquid containing a charge inhibitor to a recording medium and then cutting the area where the liquid containing the charge inhibitor has been applied with a cutting blade.The charge inhibitor can be any material that can suppress charge, such as an electron-conducting polymer, a charge-transfer complex compound, conductive carbon, a cationic surfactant, an anionic surfactant, a nonionic surfactant, an amphoteric surfactant, a cationic resin, or an anionic resin.

[0032] As the charge inhibitor, cationic surfactants, anionic surfactants, nonionic surfactants, amphoteric surfactants, cationic resins, and anionic resins are preferred, and cationic resins are more preferred. When these components are used as charge inhibitors, the liquid containing the charge inhibitor does not become a colored liquid, and therefore the quality of the resulting recorded matter is less likely to be affected.

[0033] Preferred cationic surfactants include quaternary ammonium salts such as tetraalkylammonium salts and trialkylbenzylammonium salts, imidazolinium salts, pyridinium salts, and surfactants having cationic functional groups such as primary, secondary, or tertiary amino groups. Preferred anionic surfactants include sulfonates, phosphonates, sulfate ester groups, and phosphate ester groups.

[0034] Examples of nonionic surfactants include polyoxyethylene alkyl ethers, polyoxyethylene alkylamines, and alkyl monoglyceryl ethers. Examples of amphoteric surfactants include alkyl betaines, alkyl imidazolium betaines, imidazoline-type amphoteric surfactants, acetate betaine-type amphoteric surfactants, and amido betaine-type amphoteric surfactants.

[0035] Anionic resins include polystyrene sulfonates, polyacrylates, polymaleates, and polyacrylic-maleic acid copolymer salts.

[0036] [Cationic resin] Examples of cationic resins include resins having a primary, secondary, or tertiary amine structure and resins having a quaternary ammonium salt structure. Specific examples include resins having structures such as vinylamine, allylamine, vinylimidazole, vinylpyridine, dimethylaminoethyl methacrylate, ethyleneimine, guanidine, diallyldimethylammonium chloride, and alkylamine-epichlorohydrin condensates. To increase the solubility of the cationic resin in a liquid containing a static inhibitor, the cationic resin can be used in combination with an acidic compound or the cationic resin can be subjected to a quaternary treatment.

[0037] The cationic resin preferably has a quaternary ammonium salt structure. A cationic resin having a quaternary ammonium salt structure stably maintains its cationicity, and therefore can stably exhibit anti-static properties.

[0038] The cationic resin used as the antistatic agent is preferably a polymer having a repeating structural unit represented by the following general formula (1).

[0039] TIFF2025167721000001.tif42170 (In the general formula (1), R1 and R2 each independently represent an alkyl group, and X - represents the counter anion with the quaternary ammonium cation)

[0040] In general formula (1), it is preferable that both R1 and R2 are methyl groups. That is, the repeating structural unit represented by general formula (1) is preferably a diallyldimethylammonium chloride structural unit. In the diallyldimethylammonium chloride structure, a quaternary ammonium salt is present in the resin side chain. Compared to when a quaternary ammonium salt is present in the main chain, when an ammonium salt is present in the side chain, the polarity is higher and the charge suppression ability is higher.

[0041] When a cationic resin is used as the charge inhibitor, the content (mass %) of the cationic resin in the liquid containing the charge inhibitor is preferably 0.5 mass % or more and 10.0 mass % or less, based on the total mass of the liquid containing the charge inhibitor. If the content of the cationic resin is less than 0.5 mass %, a large amount of the liquid containing the charge inhibitor must be applied to ensure the appropriate amount of charge inhibitor. This means that a large amount of components other than the charge inhibitor will also be applied, which may require a drying process for the printed matter, thereby reducing production efficiency. On the other hand, if the content of the cationic resin is more than 10.0 mass %, the viscosity of the liquid containing the charge inhibitor may increase excessively, which may reduce production efficiency.

[0042] The device for applying the liquid containing the charge inhibitor may be any device capable of applying the liquid containing the charge inhibitor to the area of ​​the recording medium to be cut, and a non-contact liquid application device or a contact liquid application device may be used. Examples of the non-contact liquid application device include liquid application devices of the spray type, shower type, dispenser type, and inkjet type. Of these, it is preferable to use an inkjet type liquid application device. By using an inkjet type liquid application device, a desired amount of liquid can be applied even to a narrow area.

[0043] Examples of contact-type liquid application devices include gravure offset rollers, bar coaters, die coaters, blade coaters, knife coaters, etc. In the case of contact-type liquid application devices, the amount of liquid containing the charge inhibitor applied can be easily adjusted by adjusting the type of roller, the contact pressure with the recording medium, and the contact pressure between the blade and roller.

[0044] The amount of antistatic agent applied to the recording medium is 50 mg / m 2 The amount of the antistatic agent applied is preferably 50 mg / m or more. 2 By doing so, it is possible to more effectively suppress the generation of static electricity and further suppress the adhesion of dust such as paper powder to the resulting recorded matter.

[0045] The processing step is a step of cutting the area of ​​the recording medium to which the liquid containing the charge inhibitor is applied with a cutting blade. In the processing step, it is sufficient to cut at least the area to which the liquid containing the charge inhibitor is applied. It is also possible to cut both the area to which the liquid containing the charge inhibitor is applied and the area to which the liquid containing the charge inhibitor is not applied. However, from the perspective of suppressing the generation of paper dust, the processing step is preferably a step of cutting only the area to which the liquid containing the charge inhibitor is applied with the cutting blade. Furthermore, the area to which the liquid containing the charge inhibitor is applied may overlap with the area to which ink is applied. However, to prevent the cutting from affecting the image recorded on the recording medium, the processing step is preferably a step of cutting the area to which ink is not applied with the cutting blade. Furthermore, the width of the liquid containing the charge inhibitor applied to the recording medium at the contact point with the cutting blade is preferably 2 mm or more. By applying the liquid containing the charge inhibitor to a width of 2 mm or more, static electricity can be more effectively suppressed, and static electricity caused by contact between the surface of the recording medium bent during cutting and the cutting blade can also be suppressed, further reducing the amount of paper dust generated. Furthermore, by applying a liquid containing a static inhibitor only to the area of ​​the recording medium that comes into contact with the cutting blade, static electricity can be suppressed without damaging the texture of the recording medium.

[0046] (Reaction solution) The method for producing a recorded matter of the present invention preferably further comprises a step of applying an aqueous reaction liquid to the recording medium, and then preferably applies ink to the recording medium so as to overlap at least a portion of the area where the reaction liquid has been applied, thereby recording an image.

[0047] Furthermore, it is preferable that the liquid containing the charge inhibitor further contains a reactant that reacts with the water-based ink. By using a liquid containing the reactant together with the charge inhibitor, the reactive liquid and the liquid containing the charge inhibitor can be applied simultaneously, thereby improving the production speed of recorded matter.

[0048] [Reactant] The reaction liquid reacts with the ink upon contact with it, causing the components in the ink (components having anionic groups, such as resins, surfactants, and self-dispersing pigments) to aggregate, and contains a reactant. The presence of the reactant destabilizes the state of the components in the ink having anionic groups when the ink and the reactant come into contact on the recording medium, thereby promoting the aggregation of the ink. Examples of the reactant include cationic components such as polyvalent metal ions and cationic resins, and organic acids. One reactant may be used alone, or two or more may be used in combination.

[0049] Examples of polyvalent metal ions that constitute polyvalent metal salts include Ca. 2+ , Cu 2+ , Ni 2+ , Mg 2+ , Sr 2+ , Ba 2+ , and Zn 2+ Divalent metal ions such as Fe 3+ , Cr 3+ , Y 3+ , and Al 3+ Examples of the trivalent metal ions include trivalent metal ions such as Cl. To add polyvalent metal ions to the reaction solution, a water-soluble polyvalent metal salt (which may be a hydrate) formed by combining a polyvalent metal ion with an anion can be used. Examples of the anion include Cl. - , Br - , I - , ClO - , ClO2 - , ClO3 - , ClO4 - , NO2 - , NO3 - , SO4 2- , CO3 2- , HCO3 - , PO4 3- , HPO4 2- , and H2PO4 - Inorganic anions such as HCOO - , (COO - )2, COOH(COO - ), CH3COO - , CH3CH(OH)COO -, C2H4(COO - )2, C6H5COO - , C6H4(COO - )2, and CH3SO3 - Examples of suitable anions include organic anions such as those mentioned above. When a polyvalent metal ion is used as the reactant, the content (% by mass) of the reaction solution calculated as a polyvalent metal salt is preferably 1.0% by mass or more and 20.0% by mass or less, based on the total mass of the reaction solution. In this specification, when the polyvalent metal salt is a hydrate, the "content (% by mass) of the polyvalent metal salt" in the reaction solution means the "content (% by mass) of the anhydrous polyvalent metal salt," excluding water as the hydrate.

[0050] The organic acid-containing reaction solution has buffering properties in the acidic range (less than pH 7.0, preferably pH 2.0 to 5.0), thereby efficiently converting anionic groups present in the ink into the acid form and causing them to aggregate. Examples of organic acids include monocarboxylic acids and salts thereof, such as formic acid, acetic acid, propionic acid, butyric acid, benzoic acid, glycolic acid, lactic acid, salicylic acid, pyrrolecarboxylic acid, furancarboxylic acid, picolinic acid, nicotinic acid, thiophenecarboxylic acid, levulinic acid, and coumaric acid; dicarboxylic acids and salts thereof, such as oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, maleic acid, fumaric acid, itaconic acid, sebacic acid, phthalic acid, malic acid, and tartaric acid; tricarboxylic acids and salts thereof, such as citric acid and trimellitic acid; and tetracarboxylic acids and salts thereof, such as pyromellitic acid. When an organic acid is used as a reactant, the content (mass %) of the organic acid in the reaction liquid is preferably 1.0 mass % or more and 50.0 mass % or less based on the total mass of the reaction liquid.

[0051] Examples of cationic resins include resins having a primary, secondary, or tertiary amine structure and resins having a quaternary ammonium salt structure. Specific examples include resins having structures such as vinylamine, allylamine, vinylimidazole, vinylpyridine, dimethylaminoethyl methacrylate, ethyleneimine, guanidine, diallyldimethylammonium chloride, and alkylamine-epichlorohydrin condensates. To enhance solubility in the reaction solution, the cationic resin can be used in combination with an acidic compound or the cationic resin can be subjected to a quaternization treatment. When a cationic resin is used as a reactant, the content (mass %) of the cationic resin in the reaction solution is preferably 0.1% by mass or more and 10.0% by mass or less, based on the total mass of the reaction solution.

[0052] [Aqueous medium] The reaction liquid is an aqueous reaction liquid containing at least water as the aqueous medium. Examples of aqueous media used in the reaction liquid include the same aqueous media that can be contained in the ink, as described below. The aqueous medium used in the reaction liquid can contain the water-soluble organic solvent that can be contained in the ink, as described below. The content (mass %) of the water-soluble organic solvent in the reaction liquid is preferably 1.0 mass % or more and 45.0 mass % or less, based on the total mass of the reaction liquid. The water-soluble organic solvent preferably contains a specific water-soluble hydrocarbon compound, as described below. The content (mass %) of the water-soluble hydrocarbon compound in the reaction liquid is preferably 1.0 mass % or more and 20.0 mass % or less, based on the total mass of the reaction liquid. Furthermore, the content (mass %) of water in the reaction liquid is preferably 50.0 mass % or more and 95.0 mass % or less, based on the total mass of the reaction liquid.

[0053] [Other ingredients] The reaction liquid may contain various other components as needed, including the same components as those that can be contained in the ink, as described below.

[0054] [Physical properties of reaction solution] The reaction liquid is an aqueous reaction liquid that can also be applied to the inkjet method. Therefore, from the viewpoint of reliability, it is preferable to appropriately control its physical properties. Specifically, the surface tension of the reaction liquid at 25°C is preferably 20 mN / m or more and 60 mN / m or less. Furthermore, the viscosity of the reaction liquid at 25°C is preferably 1.0 mPa·s or more and 10.0 mPa·s or less. The pH of the reaction liquid at 25°C is preferably 5.0 or more and 9.5 or less, and more preferably 6.0 or more and 9.0 or less.

[0055] (ink) The ink used in the method for producing a recorded matter of the present invention is a water-based inkjet ink. The components used in the ink will be described in detail below.

[0056] [Colorant] The ink preferably contains a colorant. Pigments or dyes can be used as the colorant. The content (mass %) of the colorant in the ink is preferably 0.5% by mass or more and 15.0% by mass or less, and more preferably 1.0% by mass or more and 10.0% by mass or less, based on the total mass of the ink.

[0057] Specific examples of pigments include inorganic pigments such as carbon black and titanium oxide, and organic pigments such as azo, phthalocyanine, quinacridone, isoindolinone, imidazolone, diketopyrrolopyrrole, dioxazine, etc. One type of pigment may be used alone, or two or more types may be used in combination.

[0058] As a pigment dispersion method, resin-dispersed pigments using a resin as a dispersant, and self-dispersed pigments in which hydrophilic groups are bonded to the pigment particle surface can be used. Also usable are resin-bonded pigments in which organic groups containing a resin are chemically bonded to the pigment particle surface, and microencapsulated pigments in which the pigment particle surface is coated with a resin or the like. It is also possible to use a combination of these pigments with different dispersion methods. In particular, it is preferable to use resin-dispersed pigments in which a resin as a dispersant is physically adsorbed onto the pigment particle surface, rather than resin-bonded pigments or microencapsulated pigments.

[0059] As the resin dispersant for dispersing the pigment in the aqueous medium, it is preferable to use one that can disperse the pigment in the aqueous medium by the action of anionic groups. As the resin dispersant, a resin having anionic groups can be used, and it is preferable to use a resin such as those described below, especially a water-soluble resin. The content (mass %) of the pigment in the ink is preferably 0.3 to 10.0 times the content (mass %) of the resin dispersant.

[0060] Self-dispersing pigments can be used in which an anionic group such as a carboxylic acid group, sulfonic acid group, or phosphonic acid group is bonded to the surface of the pigment particle directly or via another atomic group (-R-). The anionic group may be either an acid type or a salt type, and if it is a salt type, it may be either partially dissociated or completely dissociated. When the anionic group is a salt type, examples of the cation that serves as the counter ion include alkali metal cations, ammonium, and organic ammonium. Specific examples of the other atomic group (-R-) include linear or branched alkylene groups having 1 to 12 carbon atoms; arylene groups such as phenylene and naphthylene; carbonyl groups; imino groups; amide groups; sulfonyl groups; ester groups; and ether groups. Furthermore, combinations of these groups may also be used.

[0061] The dye preferably has an anionic group. Specific examples of the dye include azo, triphenylmethane, (aza)phthalocyanine, xanthene, and anthrapyridone dyes. The dye may be used alone or in combination of two or more. The colorant is preferably a pigment, and more preferably a resin-dispersed pigment or a self-dispersed pigment.

[0062] [resin] The ink can contain a resin. By using an ink containing a resin, it is possible to record an image with improved scratch resistance. Resins can be added to the ink (i) to stabilize the dispersion state of the pigment, i.e., as a resin dispersant or its auxiliary, and (ii) to improve various properties of the recorded image.

[0063] The content (mass %) of the resin in the ink is preferably 0.1% by mass or more and 20.0% by mass or less, and more preferably 0.5% by mass or more and 15.0% by mass or less, based on the total mass of the ink. Examples of the resin form include block copolymers, random copolymers, graft copolymers, and combinations thereof. The resin may be a water-soluble resin that can be dissolved in an aqueous medium, or may be resin particles that are dispersed in an aqueous medium. One type of resin may be used alone, or two or more types may be used in combination.

[0064] [Resin Composition] Examples of the resin include acrylic resins, urethane resins, olefin resins, etc. Among these, acrylic resins and urethane resins are preferred, and acrylic resins composed of units derived from (meth)acrylic acid or (meth)acrylate are more preferred.

[0065] The acrylic resin is preferably one having a hydrophilic unit and a hydrophobic unit as constituent units. Among these, a resin having a hydrophilic unit derived from (meth)acrylic acid and a hydrophobic unit derived from at least one of a monomer having an aromatic ring and a (meth)acrylic acid ester-based monomer is preferred. In particular, a resin having a hydrophilic unit derived from (meth)acrylic acid and a hydrophobic unit derived from at least one of a styrene and an α-methylstyrene monomer is preferred. These resins are likely to interact with pigments, and can therefore be suitably used as resin dispersants for dispersing pigments.

[0066] The hydrophilic unit is a unit having a hydrophilic group such as an anionic group. The hydrophilic unit can be formed, for example, by polymerizing a hydrophilic monomer having a hydrophilic group. Specific examples of hydrophilic monomers having a hydrophilic group include acidic monomers having a carboxylic acid group such as (meth)acrylic acid, itaconic acid, maleic acid, and fumaric acid, and anionic monomers such as anhydrides and salts of these acidic monomers. Examples of cations constituting the salts of acidic monomers include ions of lithium, sodium, potassium, ammonium, and organic ammonium. The hydrophobic unit is a unit not having a hydrophilic group such as an anionic group. The hydrophobic unit can be formed, for example, by polymerizing a hydrophobic monomer not having a hydrophilic group such as an anionic group. Specific examples of hydrophobic monomers include monomers having an aromatic ring such as styrene, α-methylstyrene, and benzyl (meth)acrylate; and (meth)acrylic acid ester monomers such as methyl (meth)acrylate, butyl (meth)acrylate, and 2-ethylhexyl (meth)acrylate.

[0067] The urethane resin can be obtained by reacting, for example, polyisocyanate with a polyol. Alternatively, a chain extender may be further added to the urethane resin. Examples of the olefin resin include polyethylene and polypropylene.

[0068] [Resin properties] As used herein, the term "water-soluble resin" means that when the resin is neutralized with an alkali equivalent to its acid value, it exists in an aqueous medium in a state in which it does not form particles whose particle size can be measured by dynamic light scattering. Whether a resin is water-soluble or not can be determined according to the following method. First, a liquid (resin solids content: 10% by mass) containing the resin neutralized with an alkali (e.g., sodium hydroxide, potassium hydroxide) equivalent to the acid value is prepared. Next, the prepared liquid is diluted 10 times (by volume) with pure water to prepare a sample solution. When the particle size of the resin in the sample solution is measured by dynamic light scattering, if no particles having the particle size are measured, the resin can be determined to be water-soluble. The measurement conditions can be, for example, Set Zero: 30 seconds, measurement count: 3, and measurement time: 180 seconds. Furthermore, a particle size distribution measuring device such as a particle size analyzer using dynamic light scattering (e.g., "UPA-EX150" manufactured by Nikkiso) can be used. Of course, the particle size distribution measuring device and measuring conditions to be used are not limited to those described above.

[0069] The water-soluble resin preferably has an acid value of 100 mgKOH / g or more and 250 mgKOH / g or less, and a weight-average molecular weight of 3,000 or more and 15,000 or less.

[0070] The acid value of the resin constituting the resin particles is preferably 5 mgKOH / g or more and 100 mgKOH / g or less. The weight average molecular weight of the resin constituting the resin particles is preferably 1,000 or more and 3,000,000 or less, more preferably 100,000 or more and 3,000,000 or less. The volume-based cumulative 50% particle diameter (D 50) is preferably 50 nm or more and 500 nm or less. The volume-based cumulative 50% particle diameter of resin particles is the diameter of the particles that is 50% of the total volume of the measured particles when integrated from the small particle diameter side in a particle diameter integration curve. The volume-based cumulative 50% particle diameter of resin particles can be measured using the dynamic light scattering particle size analyzer and measurement conditions described above. The glass transition temperature of the resin particles is preferably 40°C or more and 120°C or less, and more preferably 50°C or more and 100°C or less. The glass transition temperature (°C) of the resin particles can be measured using a differential scanning calorimeter (DSC). The resin particles do not need to contain a colorant.

[0071] [Wax particles] The ink can contain particles formed from wax (wax particles). By using ink containing wax particles, it is possible to record images with further improved abrasion resistance. In this specification, the wax may be a composition containing components other than wax, or the wax itself. The wax particles may be dispersed with a dispersant such as a surfactant or resin. One type of wax may be used alone, or two or more types may be used in combination. The content (mass %) of wax particles in the ink is preferably 0.1% by mass to 10.0% by mass, and more preferably 1.0% by mass to 5.0% by mass, based on the total mass of the ink.

[0072] In a narrow sense, wax is an ester of a water-insoluble higher monohydric or dihydric alcohol and a fatty acid, and includes animal waxes and vegetable waxes, but excludes oils and fats. In a broad sense, wax includes high-melting-point fats, mineral waxes, petroleum waxes, and blends and modified products of various waxes. In the present invention, any wax in the broad sense can be used without particular limitation. Wax in the broad sense can be classified into natural waxes, synthetic waxes, blends thereof (blended waxes), and modified products thereof (modified waxes).

[0073] Examples of natural waxes include animal waxes such as beeswax, spermaceti, and wool wax (lanolin); plant waxes such as Japan wax, carnauba wax, sugarcane wax, palm wax, candelilla wax, and rice wax; mineral waxes such as montan wax; and petroleum waxes such as paraffin wax, microcrystalline wax, and petrolatum. Examples of synthetic waxes include hydrocarbon waxes such as Fischer-Tropsch wax and polyolefin wax (e.g., polyethylene wax and polypropylene wax). Blended waxes are mixtures of the above waxes. Modified waxes are waxes that have been modified by oxidation, hydrogenation, alcohol modification, acrylic modification, urethane modification, or other methods. One of the above waxes may be used alone, or two or more may be used in combination. The wax is preferably at least one selected from the group consisting of microcrystalline wax, Fischer-Tropsch wax, polyolefin wax, paraffin wax, and modified or blended versions thereof. Among these, a blend of multiple types of wax is more preferred, and a blend of petroleum wax and synthetic wax is particularly preferred.

[0074] The wax is preferably solid at room temperature (25°C). The melting point (°C) of the wax is preferably 40°C or higher and 120°C or lower, and more preferably 50°C or higher and 100°C or lower. The melting point of the wax can be measured in accordance with the test method described in 5.3.1 (Melting Point Test Method) of JIS K2235:1991 (Petroleum Wax). For microcrystalline wax, petrolatum, and mixtures of multiple waxes, the test method described in 5.3.2 can be used for more accurate measurement. The melting point of the wax is easily affected by properties such as molecular weight (the higher the molecular weight, the higher the melting point), molecular structure (linear chains have a high melting point, and branched chains have a lower melting point), crystallinity (the higher the crystallinity), and density (the higher the crystallinity). Therefore, by controlling these properties, a wax with the desired melting point can be obtained. The melting point of the wax in the ink can be measured, for example, by ultracentrifuging the ink, washing and drying the separated wax, and then measuring it in accordance with the above test method.

[0075] [Aqueous medium] The ink used in the method for producing a recorded material of the present invention is an aqueous ink containing at least water as the aqueous medium. The ink can contain water or an aqueous medium that is a mixed solvent of water and a water-soluble organic solvent. Deionized water or ion-exchanged water is preferably used as the water. The water content (mass %) in the aqueous ink is preferably 50.0% to 95.0% by mass based on the total mass of the ink. Furthermore, the water-soluble organic solvent content (mass %) in the aqueous ink is preferably 2.0% to 40.0% by mass based on the total mass of the ink. As the water-soluble organic solvent, any of those usable for inkjet inks, such as alcohols, (poly)alkylene glycols, glycol ethers, nitrogen-containing solvents, and sulfur-containing solvents, can be used. The water-soluble organic solvents may be used alone or in combination of two or more.

[0076] [Other ingredients] The ink may contain various other components as required. Examples of other components include various additives such as antifoaming agents, surfactants, pH adjusters, viscosity adjusters, rust inhibitors, preservatives, antifungal agents, antioxidants, and anti-reduction agents. However, it is preferable that the ink does not contain a reactant to be contained in the reaction solution.

[0077] [Physical properties of the ink] The ink is an aqueous ink applicable to the inkjet method. Therefore, from the viewpoint of reliability, it is preferable to appropriately control its physical property values. Specifically, the surface tension of the ink at 25°C is preferably 20 mN / m or more and 60 mN / m or less. Also, the viscosity of the ink at 25°C is preferably 1.0 mPa·s or more and 10.0 mPa·s or less. The pH of the ink at 25°C is preferably 7.0 or more and 9.5 or less, and more preferably 8.0 or more and 9.5 or less.

Examples

[0078] Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples. However, the present invention is not limited to the following Examples as long as the gist thereof is not exceeded. Unless otherwise specified, "parts" and "%" regarding component amounts are based on mass.

[0079] <Measurement conditions of GPC> The measurement conditions of gel permeation chromatography (GPC) are shown below. · Measuring device: Trade name "Waters ALLIANCE e2695", manufactured by Waters · Column: Asahipak "GF-310", Asahipak "GF-510" (both are trade names, manufactured by Showa Denko) · Eluent: A mixed solution of a 0.5 mmol / L aqueous acetic acid solution and a 0.1 mmol / L aqueous sodium nitrate solution · Flow rate: 1.0 mL / min · Oven temperature: 40°C Detector: Refractive index (RI) detector (product name "Wyatt Optilab rex Refractive Index Detector", manufactured by Wyatt Technology)

[0080] The molecular weight was calculated using a molecular weight calibration curve prepared using a molecular weight standard (trade name "EasiCal Type PS-2 Polystyrene", manufactured by Agilent Technology).

[0081] <Preparation of Antistatic Agent> (An aqueous solution of antistatic agent A) A four-neck flask equipped with a thermometer, stirrer, and reflux condenser was charged with 80.84 parts of a 60% aqueous solution of diallyldimethylammonium chloride (DADMAC), 0.40 parts of a chain transfer agent (sodium hypophosphite), and 18.56 parts of pure water. The diallyldimethylammonium chloride used was "DADMAC" (manufactured by Tokyo Chemical Industry Co., Ltd.). The temperature was raised to 60°C, and 0.20 parts of a polymerization initiator (ammonium persulfate) was added. After heating at 60°C for 10 hours to allow the reaction, pure water was added to obtain a 20% aqueous solution of antistatic agent A, a cationic resin. The molecular weight at the peak position in the molecular weight distribution of the cationic resin (antistatic agent A) measured by gel permeation chromatography (GPC) was 40,000.

[0082] (Aqueous solutions of antistatic agents B to D) The water solubility of each of the charge inhibitors B to D was obtained in the same manner as for the above-mentioned charge inhibitor A, except for the formulation shown in Table 1. The molecular weights at the GPC peak positions of the obtained charge inhibitors B to D are shown in Table 1.

[0083] TIFF2025167721000002.tif49170

[0084] (An aqueous solution of antistatic agent E) Charge inhibitor B was dissolved in pure water to prepare a 40% aqueous solution. Hydrochloric acid was removed using an ion exchange resin (trade name "IRA900", manufactured by Organo) that had previously been ion-exchanged with sodium hydroxide, to obtain charge inhibitor E. Pure water was added to obtain a 20% aqueous solution of charge inhibitor E.

[0085] (An aqueous solution of antistatic agent F) A 40% aqueous solution of anti-static agent E was prepared by dissolving it in pure water, and a 20% aqueous solution of anti-static agent F was obtained by adding a 20% aqueous solution of acetic acid and pure water.

[0086] (An aqueous solution of antistatic agent G) 286 g of monoallylamine was added dropwise to 550 g of 35% hydrochloric acid while stirring at 5-10°C under ice cooling. After the addition, water and hydrogen chloride were removed using a rotary evaporator at 60°C under reduced pressure, yielding white crystals. The resulting white crystals were dried at 80°C under reduced pressure, yielding 485 g of monoallylamine hydrochloride. The resulting monoallylamine hydrochloride was dissolved in water to prepare a 70% aqueous solution. 1 mol% of a radical initiator (2,2'-azobis-(2-amidinopropane) dihydrochloride) relative to the monoallylamine hydrochloride was added to 50 g of the prepared aqueous solution, and 25 g of 35% hydrochloric acid was added. After static polymerization at 60°C for 40 hours, the mixture was poured into a mixture of 1900 g of acetone and 100 g of methanol. The resulting precipitate was filtered to obtain a cationic resin, which was used as antistatic agent G. Pure water was added to the resulting cationic resin to obtain a 20% aqueous solution of antistatic agent G. The molecular weight of the resulting antistatic agent G at the peak position of GPC was 10,000.

[0087] (An aqueous solution of antistatic agent H) Charge inhibitor G was dissolved in pure water to prepare a 40% aqueous solution. Hydrochloric acid was removed using an ion exchange resin (trade name "IRA900", manufactured by Organo) that had been previously ion-exchanged with sodium hydroxide, to obtain a cationic resin. Pure water was added to obtain a 20% aqueous solution of charge inhibitor H.

[0088] (An aqueous solution of antistatic agent I) A 40% aqueous solution of anti-static agent H was prepared by dissolving it in pure water. A 20% aqueous solution of anti-static agent I was obtained by adding a 20% aqueous solution of acetic acid and pure water.

[0089] (Static Inhibitors J to M) Diallyldimethylammonium chloride polymer (trade name "PAS-H-5L", manufactured by Nittobo Medical, quaternary ammonium salt, concentration 28%, molecular weight at the GPC peak position 30,000) was used as antistatic agent J.

[0090] Diallyldimethylammonium chloride-acrylamide copolymer (trade name "PAS-J-81L", manufactured by Nittobo Medical, quaternary ammonium salt, concentration 25%, molecular weight at GPC peak position 10,000) was used as antistatic agent K.

[0091] Allylamine hydrochloride polymer (trade name "PAA-HCL-10L", manufactured by Nittobo Medical, primary amine, concentration 28%, molecular weight at GPC peak position 100,000) was used as antistatic agent L.

[0092] Polyamidepolyamine-epichlorohydrin condensation resin (trade name "EPA-SK01", manufactured by Yokkaichi Chemical Co., Ltd., tertiary amine, concentration 12.5%, molecular weight at the GPC peak position of 200,000 or more) was used as the antistatic agent M.

[0093] (An aqueous solution of antistatic agents N to S) Polyoxyethylene (23) lauryl ether (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd., nonionic surfactant) was dissolved in pure water to prepare a 20% aqueous solution of antistatic agent N.

[0094] Lauryltrimethylammonium chloride (Fujifilm Wako Pure Chemical Industries, Ltd., cationic surfactant) was dissolved in pure water to prepare a 20% aqueous solution of antistatic agent O.

[0095] Octadecyldimethyl(3-sulfopropyl)ammonium hydroxide (manufactured by Tokyo Chemical Industry Co., Ltd., amphoteric surfactant) was dissolved in pure water to prepare a 20% aqueous solution of antistatic agent P.

[0096] Sodium dodecylbenzenesulfonate (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd., anionic surfactant) was dissolved in pure water to prepare a 20% aqueous solution of antistatic agent Q.

[0097] Sodium polystyrene sulfonate (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd., anionic polymer) was dissolved in pure water to prepare a 20% aqueous solution of antistatic agent R.

[0098] Polyethylene glycol 1000 (a nonionic polymer manufactured by Tokyo Chemical Industry Co., Ltd.) was dissolved in pure water to prepare a 20% aqueous solution of antistatic agent S.

[0099] <Preparation of a liquid containing an antistatic agent> The components (unit: %) shown in Tables 2-1 and 2-2 were mixed and thoroughly stirred, and then the mixture was pressure filtered through a cellulose acetate filter (manufactured by Advantec) with a pore size of 3.0 μm to prepare a solution containing each antistatic agent. In Tables 2-1 and 2-2, "Acetylenol E100" is the trade name of a surfactant manufactured by Kawaken Fine Chemicals, and "Proxel GXL(S)" is the trade name of a preservative manufactured by Lonza.

[0100] TIFF2025167721000003.tif181170

[0101] TIFF2025167721000004.tif181170

[0102] <Preparation of reaction solution> The components (unit: %) shown in Table 3 were mixed, thoroughly stirred, and then pressure filtered through a cellulose acetate filter (manufactured by Advantec) with a pore size of 3.0 μm to prepare each reaction liquid. Note that reaction liquid 2 and liquid 14 containing a charge inhibitor, reaction liquid 3 and liquid 15 containing a charge inhibitor, and reaction liquid 4 and liquid 1 containing a charge inhibitor all have the same composition.

[0103] TIFF2025167721000005.tif70170

[0104] <Preparation of pigment dispersion> (Pigment dispersion 1) A styrene-ethyl acrylate-acrylic acid copolymer (Resin 1) with an acid value of 150 mgKOH / g and a weight-average molecular weight of 8,000 was prepared. 20.0 parts of Resin 1 were neutralized with potassium hydroxide in an amount equimolar to its acid value, and an appropriate amount of pure water was added to prepare an aqueous solution of Resin 1 with a resin (solids) content of 20.0%. A mixture was obtained by mixing 10.0 parts of pigment (carbon black), 15.0 parts of the Resin 1 aqueous solution, and 75.0 parts of pure water. The resulting mixture and 200 parts of 0.3 mm diameter zirconia beads were placed in a batch-type vertical sand mill (Imex) and dispersed for 5 hours with water cooling. After centrifuging to remove coarse particles, the mixture was pressure-filtered through a 3.0 μm pore-size cellulose acetate filter (Advantec) to prepare Pigment Dispersion 1 with a pigment content of 10.0% and a resin dispersant (Resin 1) content of 3.0%.

[0105] <Preparation of resin particles> (Dispersion of resin particles 1) A four-neck flask equipped with a stirrer, reflux condenser, and nitrogen gas inlet tube was charged with 74.0 parts of ion-exchanged water and 0.2 parts of potassium persulfate and mixed. An emulsion was prepared by mixing 24.0 parts of ethyl methacrylate, 1.5 parts of methacrylic acid, and 0.3 parts of a reactive surfactant (trade name "Aqualon KH-05" manufactured by Daiichi Kogyo Seiyaku Co., Ltd.). Under a nitrogen atmosphere, the emulsion was added dropwise to the four-neck flask over 1 hour and allowed to polymerize for 2 hours while stirring at 80°C. After cooling to 25°C, ion-exchanged water and an aqueous solution containing potassium hydroxide in an amount equimolar to the acid value of the resin particles were added to prepare an aqueous dispersion of resin particles 1 with a resin particle (solid content) content of 25.0%.

[0106] <Ink Preparation> The components (unit: %) shown in Table 4 were mixed and thoroughly stirred, and then pressure filtered through a cellulose acetate filter (manufactured by Advantec) with a pore size of 3.0 μm to prepare Ink 1. "Acetylenol E100" is the trade name of a surfactant manufactured by Kawaken Fine Chemicals, and "Proxel GXL(S)" is the trade name of a preservative manufactured by Lonza.

[0107] TIFF2025167721000006.tif55170

[0108] <Evaluation> Using an inkjet recording apparatus 100 configured as shown in Figure 1, an image was recorded on a recording medium according to the evaluation conditions shown in Table 5. In the present invention, in the evaluation criteria for each item below, "AA", "A" and "B" were defined as acceptable levels, and "C" as an unacceptable level. The evaluation results are shown in Table 5.

[0109] <Production of Recorded Materials> (Image recording process) An inkjet recording apparatus 100 having the configuration shown in FIG. 1 was prepared. In this example, the first recording unit was not used, and an image was recorded on a recording medium using the second recording unit. The ink and reaction liquid combinations shown in Table 5 were filled into the second reaction liquid depositing device 1202 of the second liquid depositing device 1201 and the second ink depositing device 1203 of the inkjet recording apparatus 100. Furthermore, if the reaction liquid itself contains a charge inhibitor, the liquid containing the charge inhibitor is filled into the second reaction liquid depositing device 1202. On the other hand, if the reaction liquid itself does not contain a charge inhibitor but a separate liquid containing a charge inhibitor is used, a second ink depositing device 1203 filled with a liquid containing the charge inhibitor is used together with the second ink depositing device 1203 filled with ink. In this case, the second ink depositing device filled with a liquid containing the charge inhibitor is disposed downstream in the transport direction of the recording medium 1000 (downstream in the X direction of FIG. 1) from the second ink depositing device 1203 filled with ink. In the inkjet recording apparatus 100 used in this embodiment, an image was recorded under the condition that one ink droplet of 4.0 ng was applied to a unit area of ​​1 / 1,200 inch x 1 / 1,200 inch, and the recording duty was 100% (8.93 g / m2 The recording medium is a roll of art paper (product name "Art PW8k", manufactured by Lintec, water absorption capacity according to the Bristow method: 9.5 mL / m²). 2 ) was used.

[0110] In Examples 1 to 13 and 17 to 22, the ink, reaction liquid, and liquid containing the charge inhibitor were applied in a striped pattern of 5 cm width in a direction perpendicular to the cut portion, so that the area where the ink and reaction liquid were applied (image area) and the area where the liquid containing the charge inhibitor was applied did not overlap. 2 equivalent) and 20% (1.79 g / m 2 The reaction liquid and the ink were applied to the area where the liquid containing the charge inhibitor was applied, and the printing duty was set to 25% (equivalent to 2.23 g / m). 2 Equivalent (static inhibitor 111.6 mg / m 2 After the image was recorded, the recording medium was left to stand for 24 hours under conditions of a temperature of 23°C and a humidity of 50%.

[0111] In Examples 14 to 16, the reaction liquid itself was a liquid containing a charge inhibitor. That is, the second ink applicator 1203 filled with a liquid containing a charge inhibitor was not used, and images were recorded using the second reaction liquid applicator 1202 filled with a reaction liquid that is a liquid containing a charge inhibitor, and the second ink applicator 1203 filled with ink. In Examples 14 to 16, the reaction liquid was used at a printing duty of 25% (2.23 g / m 2 Equivalent (static inhibitor 111.6 mg / m 2 )) was applied to the entire surface of the recording medium. The ink was applied in a direction perpendicular to the cut portion of the reaction liquid (the longitudinal direction of the roll paper) so that the ink-applied area and the ink-unapplied area formed a striped pattern of 5 cm widths. Otherwise, an image was recorded in the same manner as in Example 1.

[0112] In Example 23, the amount of liquid containing the antistatic agent applied (printing duty) was 12.5% ​​(1.12 g / m 2 Equivalent (static inhibitor 55.8 mg / m 2Except for this, an image was recorded in the same manner as in Example 1.

[0113] In Example 24, the amount of liquid containing the anti-static agent applied (printing duty) was set to 10% (0.89 g / m 2 Equivalent (static inhibitor 44.6 mg / m 2 Except for this, an image was recorded in the same manner as in Example 1.

[0114] In Example 25, the liquid containing the charge inhibitor was applied not only to the area where the liquid containing the charge inhibitor was applied, but also to the image area so that the printing duty was 25%. Except for this, an image was recorded in the same manner as in Example 1.

[0115] In Example 26, the amount of liquid containing the charge inhibitor applied (printing duty) was set to 12.5%, and the liquid containing the charge inhibitor was also applied in an overlapping manner to the image area so that the printing duty was 12.5%. Except for this, an image was recorded in the same manner as in Example 1.

[0116] In Example 27, the amount of liquid containing the charge inhibitor applied (printing duty) was set to 10%, and the liquid containing the charge inhibitor was also applied in an overlapping manner to the image area so that the printing duty was also 10%. Except for this, an image was recorded in the same manner as in Example 1.

[0117] In Examples 28 to 33, 20 cm wide strip-shaped image areas to which ink and reaction liquid were applied and 1 cm wide strip-shaped non-image areas to which ink and reaction liquid were not applied were prepared every 21 cm in the direction parallel to the cut section (short direction of the roll paper). The image areas were prepared using the combinations of reaction liquid and ink shown in Table 5, with the reaction liquid printing duty set to 5% (0.45 g / m 2 equivalent), and the ink printing duty is 20% (1.79 g / m 2 The images were recorded at 1000 Hz (equivalent to 1000 Hz).

[0118] In Examples 28 to 30, the liquid containing the charge inhibitor was applied in a direction perpendicular to the cut section (the longitudinal direction of the roll paper) so that areas where the liquid containing the charge inhibitor was applied and areas where it was not applied formed stripes each 5 cm wide. The liquid containing the charge inhibitor was applied to the areas where the liquid containing the charge inhibitor was applied so that the recording duty was 25% in Example 28, 12.5% ​​in Example 29, and 10% in Example 30. Except for this, images were recorded in the same manner as in Example 1.

[0119] In Examples 31 to 33, a liquid containing a charge inhibitor was applied to the 1 cm wide strip-shaped non-image area of ​​Example 28. In Example 31, the liquid containing a charge inhibitor was applied to the entire surface of the 1 cm wide non-image area at a recording duty of 25% (1.12 g / m 2 Equivalent (static inhibitor 55.8 mg / m 2 Except for this, an image was recorded in the same manner as in Example 28.

[0120] In Example 32, in a non-image area having a width of 1 cm, the area to which the liquid containing the charge inhibitor was not applied was 4 mm wide, the area to which the liquid was applied was 2 mm wide, and the area to which the liquid containing the charge inhibitor was not applied was 4 mm wide. 2 Equivalent (static inhibitor 55.8 mg / m 2 Except for this, an image was recorded in the same manner as in Example 28.

[0121] In Example 33, in a non-image area having a width of 1 cm, the area to which the liquid containing the charge inhibitor was not applied was 4.75 mm wide, the area to which the liquid was applied was 0.5 mm wide, and the area to which the liquid containing the charge inhibitor was not applied was 4.75 mm wide. In the area to which the liquid containing the charge inhibitor was applied, a recording duty of 25% (1.12 g / m 2 Equivalent (static inhibitor 55.8 mg / m 2 Except for this, an image was recorded in the same manner as in Example 28.

[0122] In Comparative Example 1, an image was recorded in the same manner as in Example 31, except that no liquid containing a charge inhibitor was applied. In Comparative Example 2, an image was recorded in the same manner as in Example 1, except that no liquid containing a charge inhibitor was applied. In Comparative Example 3, an image was recorded in the same manner as in Example 1, except that liquid 22 containing no charge inhibitor and to which ion-exchanged water was added was used instead of charge inhibitor A.

[0123] (Processing process) A sheet cutter (product name "PT-350LX-D", manufactured by Soltec) was used to cut 50 times to a width of 21 cm per sheet, yielding 50 21 cm-wide recorded materials. In Examples 1 to 27 and Comparative Examples 2 and 3, cutting was performed in the width direction of the roll paper, perpendicular to the image area. In Examples 28 to 30, non-image areas, to which a liquid containing a charge inhibitor had been applied in a partial area, were cut in the width direction of the roll paper. In Example 31, non-image areas, to which a liquid containing a charge inhibitor had been applied entirely, were cut in the width direction of the roll paper. In Example 32, cutting was performed so that the cutting position of the cutting blade was located at the center of a 2 mm band in the non-image area to which the liquid containing a charge inhibitor had been applied. In Example 33, cutting was performed so that the cutting position of the cutting blade was located at the center of a 0.5 mm band in the non-image area to which the liquid containing a charge inhibitor had been applied. In Comparative Example 1, cutting was performed so that the cutting position of the cutting blade was located at the center of a 1 cm width of the non-image area.

[0124] (Reduces paper dust generation) Fifty sheets of the cut recording medium were stacked to form a laminate. This laminate was then dropped from a height of 15 cm onto a wooden desk under its own weight, with the cut surface parallel to the desk surface. After dropping 20 times on each of the two cut surfaces, a total of 40 times, the fallen paper dust was collected. The mass of the collected paper dust was measured using an electronic balance, and the suppression of paper dust generation was evaluated according to the following evaluation criteria. The results are shown in Table 5. AA: The mass of paper powder was 0 g or more and less than 0.001 g. A: The mass of paper powder was 0.001 g or more and less than 0.003 g. B: The mass of paper powder was 0.003 g or more and less than 0.005 g. C: The mass of paper powder was 0.005 g or more.

[0125] In Example 31, the evaluation result for paper dust generation suppression was "AA", but the texture of the paper changed because the liquid containing the antistatic agent was applied to the entire non-image area of ​​the recording medium.

[0126] TIFF2025167721000007.tif255162

[0127] The disclosure of this embodiment includes the following methods. (Method 1) A method for producing an inkjet recorded matter, comprising a step of applying a water-based ink to a recording medium by an inkjet method to record an image, The method for producing an inkjet recorded matter further comprises a processing step of applying a liquid containing a charge inhibitor to the recording medium, and then cutting the area where the liquid containing the charge inhibitor has been applied with a cutting blade. (Method 2) The method for producing an inkjet recorded matter according to Method 1, wherein the liquid containing the antistatic agent further contains a reactant that reacts with the water-based ink. (Method 3) The method for producing an inkjet recorded matter according to Method 1 or 2, wherein the processing step is a step of cutting only the area where the liquid containing the anti-static agent has been applied with the cutting blade. (Method 4) The amount of the charge inhibitor applied to the recording medium is 50 mg / m 2 4. The method for producing an inkjet recorded matter according to any one of Methods 1 to 3 above. (Method 5) The method for producing an inkjet recorded matter according to any one of Methods 1 to 4, wherein the antistatic agent is a cationic resin. (Method 6) The method for producing an inkjet recorded matter according to any one of Methods 1 to 5, wherein the antistatic agent is a polymer having a repeating structural unit represented by the following general formula (1): TIFF2025167721000008.tif42170 (In the general formula (1), R1 and R2 each independently represent an alkyl group, and X - represents the counter anion with the quaternary ammonium cation)

Claims

1. A method for producing an inkjet recorded matter, comprising a step of applying a water-based ink to a recording medium by an inkjet method to record an image, The method for producing an inkjet recorded matter further comprises a processing step of applying a liquid containing a charge inhibitor to the recording medium, and then cutting the area where the liquid containing the charge inhibitor has been applied with a cutting blade.

2. The method for producing an inkjet recorded matter according to claim 1 , wherein the liquid containing the anti-static agent further contains a reactant that reacts with the water-based ink.

3. The method for producing an inkjet recorded matter according to claim 1, wherein the processing step is a step of cutting only the area where the liquid containing the anti-static agent is applied with the cutting blade.

4. The amount of the charge inhibitor applied to the recording medium is 50 mg / m ２ The method for producing an inkjet recorded matter according to claim 1, wherein the method is as described above.

5. The method for producing an inkjet recorded matter according to claim 1, wherein the antistatic agent is a cationic resin.

6. 2. The method for producing an inkjet recorded matter according to claim 1, wherein the antistatic agent is a polymer having a repeating structural unit represented by the following general formula (1): (In the general formula (1), R １ and R ２ each independently represents an alkyl group; X － represents a counter anion with the quaternary ammonium cation)

Images