JP4605464B2 - Image forming apparatus - Google Patents

Description

  The present invention relates to an image forming apparatus, and more particularly, to an image forming apparatus that forms a desired image on a medium by fixing the ink on a medium by a reaction between an ink containing a color material and a treatment liquid.

  2. Description of the Related Art In recent years, ink jet recording apparatuses have become widespread as image forming apparatuses that form images such as photographs and documents on media. An ink jet recording apparatus ejects (drops) ink droplets onto a medium (recording medium) from a nozzle provided in the head while moving the head and the recording medium relatively to form a desired image on the medium. Form.

  Depending on the type of media and the type of ink, the ink droplets deposited on the media may not be cured and fixed, and the quality of the formed image may be significantly degraded. In order to prevent such image deterioration, there has been proposed an ink jet recording apparatus that uses ultraviolet curable ink to irradiate ultraviolet curable ink deposited on a medium with ultraviolet rays to cure and fix the ink.

For example, Patent Document 1 discloses an ink jet recording apparatus having a so-called shuttle type head that ejects ultraviolet curable ink onto a medium while scanning the head in the paper width direction of the medium. According to this apparatus, ultraviolet rays (UV light) are irradiated from an ultraviolet light source (UV light source) provided at a position facing the head on the back side of the recording surface of the media, so that the UV curable ink has landed on the medium and then UV is irradiated. The time until the light is irradiated is shortened to promote the curing and fixing of the ultraviolet curable ink ejected onto the medium.
JP2003-200244A

  By the way, in the ink jet recording apparatus of Patent Document 1, in order to prevent ejection failure such as nozzle clogging due to irradiation of UV light to the head facing the UV light source, it is movable between the medium and the UV light source. Is provided so that UV light is not irradiated when the head is in a recording range where ink can be ejected onto the medium, and UV light is controlled when the head is outside the recording range. . When such a blocking plate is provided, since the head is in the recording range when droplets of ultraviolet curable ink are ejected, UV light can be irradiated almost simultaneously when the ultraviolet curable ink lands on the medium. Can not. Accordingly, a certain time is required from the time when the ultraviolet curable ink lands on the medium to the time when the ink is cured and fixed, which may cause image deterioration. In particular, in the case of a line-type head having a length corresponding to the paper width of the medium, the droplet ejection operation is performed with the head fixed in the paper width direction of the medium, that is, with the head always in the recording range. Therefore, even if the movable blocking plate as described above is provided, it is difficult to irradiate the UV light substantially simultaneously when the ultraviolet curable ink lands on the medium.

  In addition, when a movable blocking plate is provided, a certain space is required between the medium and the UV light source, and the UV light emitted from the UV light source is diffused by this space, so that the efficiency is deteriorated. It becomes a factor that leads to improvement. In addition, there is a problem of reliability in that UV light is applied to the head due to breakage or failure of the movable blocking plate, resulting in ejection failure.

  In addition, when other ink droplets are subsequently ejected so as to overlap (touch) at least part of the ink droplets on the medium before the UV light is irradiated, the ink droplets are mixed (unified). Phenomenon, that is, landing interference may occur. Further, when the ejected ink penetrates into the medium, the formed dots may be spread or spread. It is also necessary to prevent image degradation due to such landing interference and bleeding.

  The present invention has been made in view of such circumstances, and an image forming apparatus that forms a preferable image by quickly curing and fixing ink ejected onto a recording medium while preventing landing interference and bleeding. The purpose is to provide.

  In order to achieve the above object, according to the invention described in claim 1, any one of the first liquid and the second liquid containing the coloring material contains a radiation curable polymerizable compound, and the other starts curing. A first liquid ejecting unit that contains an agent and ejects the first liquid onto the recording surface of the recording medium; and the region of the recording surface of the recording medium on which the first liquid is ejected. A second liquid ejecting means for ejecting the second liquid, and a position facing the second liquid ejecting means across the recording medium, and the first liquid on the recording surface of the recording medium Radiation irradiation means for irradiating the mixed liquid mixed with the second liquid from the back side of the recording surface of the recording medium, and the recording medium is a medium that transmits the radiation. An image forming apparatus is provided.

  According to the present invention, the first liquid containing either one of the radiation curable polymerizable compound and the polymerization initiator and the second liquid containing the other and containing the coloring material are used, and the second liquid is used. By discharging the first liquid prior to the liquid, it is possible to prevent landing interference and bleeding. In addition, by providing radiation irradiating means at a position opposite to the second liquid ejecting means across the recording medium that transmits radiation, the recording medium can be efficiently irradiated with radiation, and the recording surface of the recording medium When the first liquid and the second liquid are mixed together, curing and fixing can be performed almost simultaneously. Since the polymerization reaction does not occur before the first liquid and the second liquid are mixed, no discharge failure occurs in the first liquid discharge means and the second liquid discharge means. Thereby, a high-quality image can be formed.

  A second aspect of the present invention is the image forming apparatus according to the first aspect, wherein the first liquid contains a diffusion inhibitor.

  According to the aspect of the second aspect, it is possible to fix the second liquid in a state where the spread of the second liquid landed on the recording surface of the recording medium is suppressed.

  According to a third aspect of the present invention, in the image forming apparatus according to the first or second aspect, at least one of the first liquid ejecting unit and the second liquid ejecting unit is formed on the recording medium. It is a line head in which a large number of nozzles are arranged over a length corresponding to the paper width.

  Invention of Claim 4 is an image forming apparatus of any one of Claim 1 thru | or 3, Comprising: The said radiation permeate | transmits between the said recording medium and the said radiation irradiation means, In addition, a support member that supports the recording medium is provided so that a portion of the recording medium that faces the second liquid ejection unit is substantially planar.

  According to the fourth aspect of the present invention, it is possible to prevent the radiation irradiating means from being contaminated by the second liquid ejected by the second liquid ejecting means disposed at a position facing the radiation irradiating means.

  By using the first liquid and the second liquid containing the other and containing the coloring material, the first liquid is discharged prior to the second liquid, thereby preventing landing interference and bleeding. be able to. In addition, by providing radiation irradiating means at a position opposite to the second liquid ejecting means across the recording medium that transmits radiation, the recording medium can be efficiently irradiated with radiation, and the recording surface of the recording medium When the first liquid and the second liquid are mixed together, curing and fixing can be performed almost simultaneously. Since the polymerization reaction does not occur before the first liquid and the second liquid are mixed, no discharge failure occurs in the first liquid discharge means and the second liquid discharge means. Thereby, a high-quality image can be formed.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[Configuration of inkjet recording apparatus]
FIG. 1 is an overall configuration diagram of an ink jet recording apparatus according to an embodiment of the present invention. The ink jet recording apparatus 10 shown in this example uses, for example, a recording medium that transmits ultraviolet rays (UV light), such as vinyl chloride and polypropylene, for the processing liquid and each color ink landed on the surface of the recording medium. This is a two-component ink jet recording apparatus that develops a polymerization reaction by irradiating UV light from the back side of the recording surface.

  As shown in FIG. 1, an inkjet recording apparatus 10 includes a plurality of ink ejection heads 12 that eject each color ink [second liquid] of black (K), cyan (C), magenta (M), and yellow (Y). (12K, 12C, 12M, 12Y) [second liquid ejecting means] and a treatment liquid ejection head 14 (14K, 14C, 14M, 14) for ejecting a treatment liquid (S) [first liquid] that reacts with each color ink 14Y) [First liquid ejecting means], each color ink (K, C, M, Y) to be supplied to the ink ejection head 12, and the processing liquid (S) to be supplied to the processing liquid ejection head 14 are stored. Recording is performed while maintaining the flatness of the recording medium 16, the liquid storage / loading unit 18, the paper supply unit 20 that supplies the recording medium 16, the discharge unit 22 that discharges the recorded recording medium (printed matter) to the outside. Transport unit for transporting the medium 16 4 and a UV light irradiation unit that is disposed at a position facing each of the ink ejection heads 12 (12K, 12C, 12M, 12Y) across the recording medium 16 and irradiates the recording medium 16 with UV light from the back side of the recording surface 26 (26K, 26C, 26M, 26Y) [ultraviolet irradiation means]. Hereinafter, the ink ejection head and the treatment liquid ejection head are also simply referred to as an ejection head.

  For example, a magazine for rolled paper (continuous paper) is provided in the paper supply unit 20. A plurality of magazines having different paper widths, paper quality, and the like may be provided. Further, instead of the roll paper magazine or in combination therewith, the paper may be supplied by a cassette in which cut papers are stacked and loaded.

  When a plurality of types of recording media can be used, an information recording body such as a barcode or wireless tag that records paper type information is attached to the magazine, and the information on the information recording body is read by a predetermined reader. Therefore, it is preferable to automatically determine the type of paper to be used and perform ink ejection control so as to realize appropriate ink ejection according to the type of paper.

  The transport unit 24 includes a plurality of platens 28 arranged at positions facing the respective ink ejection heads 12 (12K, 12C, 12M, and 12Y) on the back side of the recording surface of the recording medium 16, and the treatment liquid ejection heads 14 ( 14K, 14C, 14M, and 14Y), and rollers provided at predetermined intervals along the paper conveyance direction (sub-scanning direction) so as to sandwich both surfaces of the recording medium 16 31 and 32.

  The power of a motor (not shown) is transmitted to at least one of the rollers 31 and 32, and the recording medium 16 sandwiched between the rollers 31 and 32 is transported in the paper transport direction. The platen 28 and the guide 30 are arranged so as to support the recording medium 16 from the back side of the recording surface of the recording medium 16, and at least portions facing the ejection surfaces of the ink ejection head 12 and the treatment liquid ejection head 14 are configured to be flat. Has been. The platen 28 is made of a material that transmits UV light, and transmits UV light irradiated from each UV light irradiation unit 26 described later. As a material constituting the platen 28, for example, a transparent material such as glass or PET is used. Further, the platen 28 may be made of a material (for example, PE, PP, POM, etc.) that is not transparent and relatively easily transmits UV light.

  Each of the ink discharge heads 12 (12K, 12C, 12M, 12Y) and each of the treatment liquid discharge heads 14 (14K, 14C, 14M, 14Y) has a length corresponding to the maximum paper width targeted by the inkjet recording apparatus 10. And a full-line head fixedly installed so as to extend along a direction (main scanning direction) substantially orthogonal to the paper conveyance direction of the recording medium 16. A predetermined liquid (each color ink or processing liquid) is discharged on the discharge surface of each discharge head 12 or 14 facing the recording medium 16 over a length (full width of the drawable range) exceeding at least one side of the maximum size recording medium. A plurality of nozzles are arranged.

  Ink discharge heads 12K, 12C, 12M, and 12Y that discharge black (K), cyan (C), magenta (M), and yellow (Y) color inks from the upstream side along the paper conveyance direction in FIG. Placed in. Processing liquid discharge heads 14K, 14C, 14M, and 14Y that discharge the processing liquid (S) are disposed on the upstream side of the respective ink discharge heads 12K, 12C, 12M, and 12Y in the paper conveyance direction.

  The liquid storage / loading unit 14 includes inks (K, C, M, Y) of each color ejected by the ink ejection heads 12 (12K, 12C, 12M, 12Y), and processing liquid ejection heads 14 (14K, 14C). , 14M, 14Y) each having a tank for storing the processing liquid (S) discharged, and each tank communicates with each discharge head 12, 14 via a pipe line (not shown). Further, the liquid storage / loading unit 14 includes notifying means (display means, warning sound generating means, etc.) for notifying that when the remaining amount of liquid is low, and has a mechanism for preventing erroneous loading between liquids. is doing.

  Each of the UV light irradiation units 26 (26K, 26C, 26M, and 26Y) is disposed substantially directly below each platen 28 on the back side of the recording surface of the recording medium 16. That is, each UV light irradiation unit 26 is provided at a position facing each ink ejection head 12 (12K, 12C, 12M, 12Y) across the recording medium 16 and each platen 28. Each UV light irradiation unit 26 has a structure in which a UV light source 36 is provided on the inner peripheral side of a reflector 34 formed in a semicircular arc shape so as to open to the recording medium 16 side, and diffuses to other regions. Without being performed, the UV light is efficiently irradiated toward the back side of the region (droplet ejection region) where each ink ejection head 12 on the recording medium 16 ejects droplets.

  The UV light irradiated by each UV light irradiation unit 26 is transmitted without being absorbed or reflected by each platen 28 composed of a member that transmits ultraviolet light, and irradiated to the back side of the droplet ejection area on the recording medium 16. .

  Each platen 28 also has a function as a protective cover for preventing ink ejected from each ink discharge head 14 from adhering to each UV light irradiation unit 26 provided at a position facing each other and becoming dirty. Yes.

  The composition of the treatment liquid and ink used in the inkjet recording apparatus 10 of this example will be described in detail later. The treatment liquid comprises a polymerization initiator, a diffusion inhibitor (flocculating agent), and oil (high-boiling organic solvent). Each color ink contains a UV monomer (ultraviolet curable monomer) and a color material (colorant). The combined configuration of the processing liquid and each color ink avoids image deterioration due to landing interference or bleeding mainly by the function of the diffusion preventing agent contained in the processing liquid, and also leaks or reflects light from the UV light irradiation unit 26. However, since each liquid does not contain the polymerization initiator and the UV monomer together, the polymerization reaction does not occur, and the processing in the nozzles of the discharge heads 12 and 14 occurs. Solidification of the liquid and each color ink is prevented. Moreover, also when each color ink contains a polymerization initiator and a process liquid contains a UV monomer, the effect similar to the above can be show | played.

  Each color ink may contain an ultraviolet curable polymerizable compound such as a UV oligomer or a mixture of a UV monomer and a UV oligomer in place of or in combination with the UV monomer.

  With such a configuration, the processing liquid discharge head 14 </ b> K disposed on the most upstream side in the paper transport direction ejects the processing liquid onto the recording medium 16, and the processing on the recording medium 16 is performed as the recording medium 16 is transported. When the liquid moves substantially directly below the ink discharge head 12K on the downstream side in the paper conveyance direction, black (K) ink is ejected so that the ink discharge head 12K overlaps the processing liquid. The timing at which the ink ejection head 12K ejects droplets may be detected by a sensor, or a pulse or time from a reference point may be measured. By ejecting the treatment liquid in advance of the ink in this way, it is possible to prevent image deterioration due to landing interference or bleeding.

  The UV light irradiation by the UV light irradiation unit 26K is performed at substantially the same timing as the droplet ejection of the corresponding ink discharge head 12K. The UV light irradiation timing may be earlier than the corresponding droplet ejection timing of the ink ejection head 12K. Although UV light irradiation may always be performed, it is preferable to perform UV light irradiation only when the ink ejection head 12K ejects droplets from the viewpoint of energy saving.

  The UV light irradiated from the UV light irradiation unit 26K passes through the platen 28 made of a material that transmits UV light and the recording medium 16 into a mixed liquid (mixed liquid of processing liquid and ink) on the recording medium 16. Irradiated. When UV light is irradiated to the mixed liquid, radicals are generated from the curing initiator contained in the processing liquid, a polymerization reaction occurs between the processing liquid and the ink, and the image (dot) formed by the ink is cured. The state is fixed to the recording medium 16. Before mixing the treatment liquid and the ink, since neither the treatment liquid nor the ink contains the polymerization initiator and the UV monomer, the polymerization reaction does not occur. Even if the UV light irradiation unit 26K performs the UV light irradiation before the droplet is dropped, no ejection failure such as nozzle clogging occurs. With the black (K) ink cured and fixed on the recording medium 16 in this manner, the same process is performed for each of the other color (C, M, Y) inks. As described above, the ink of each color is cured and fixed on the recording medium 16 and then the ink droplets of the other colors are repeatedly ejected, whereby an image with good image quality can be formed on the recording medium 16.

  In the ink jet recording apparatus 10 of this example, it is not necessary to provide a shielding plate for preventing the UV light from being irradiated on the discharge surfaces of the discharge heads 12 and 14, and the ink discharge head 12 and the UV light irradiation unit opposed thereto are provided. The relative distance to 26 can be shortened. As a result, the UV light irradiation unit 26 can perform UV light irradiation with smaller energy, and the ink jet recording apparatus 10 can be reduced in size and cost.

  In this example, the configuration of KCMY standard colors (four colors) is illustrated, but the combination of ink colors and the number of colors is not limited to this embodiment, and light ink and dark ink are used as necessary. May be added. For example, a configuration in which light ink such as light cyan and light magenta is ejected is also possible.

[Discharge head configuration]
Next, the configuration of the ink discharge head 12 (12K, 12C, 12M, 12Y) and the treatment liquid discharge head 14 (14K, 14C, 14M, 14Y) will be described. In addition, since the structure of each discharge head 12 and 14 is common, below, it shall represent by these and the code | symbol 50 is represented.

  FIG. 2 is a plan view showing the ejection surface of the ejection head 50. As shown in the figure, nozzles 51 for discharging a predetermined liquid (each color ink or processing liquid) are formed in a staggered matrix (two-dimensional) on the discharge surface of the discharge head 50. Projection nozzle rows projected along the main scanning direction are arranged at regular intervals with a constant nozzle pitch, whereby the dot pitch is substantially densified.

  FIG. 3 is a side sectional view showing a part of the ejection head 50. As shown in the figure, a pressure chamber 52 communicating with the nozzle 51 is formed inside the ejection head 50. The pressure chamber 52 communicates with the common channel 55 through a supply port 53 formed at one end thereof. In the common flow channel 55, a predetermined liquid (each color ink or processing liquid) supplied from an ink tank (not shown) arranged in the liquid storage / loading unit 14 of FIG. Then, the liquid is supplied to the pressure chamber 52.

  The upper wall surface of the pressure chamber 52 is constituted by a diaphragm 56. A piezoelectric element 58 is joined to the surface of the diaphragm 56 (on the opposite side to the pressure chamber 52 side) at a position corresponding to the pressure chamber 52. The piezoelectric element 58 has a structure in which an individual electrode (drive electrode) 58b is provided on the upper surface of a thin film piezoelectric body 58a. The diaphragm 56 is made of a conductor, and also serves as a common electrode for the plurality of piezoelectric elements 58.

  With this configuration, when a predetermined drive voltage (drive signal) is applied to the piezoelectric element 58, the diaphragm 56 is bent toward the pressure chamber 52 due to the displacement of the piezoelectric element 58, and the liquid in the pressure chamber 52 is pressurized. . Then, droplets are discharged from the nozzle 51 communicating with the pressure chamber 52. Thereafter, when the application of the drive voltage is released, the diaphragm 56 returns to the original state, and a predetermined liquid is supplied again from the common flow channel 55 to the pressure chamber 52 via the supply port 53, and the next discharge operation ( (Droplet ejection operation).

[Explanation of control system]
FIG. 4 is a principal block diagram showing the system configuration of the inkjet recording apparatus 10. The inkjet recording apparatus 10 includes a communication interface 70, a system controller 72, a memory 74, a motor driver 76, a heater driver 78, a print controller 80, an image buffer memory 82, an ink head driver 84, a processing liquid head driver 85, and a light source driver. 92 and the like.

  The communication interface 70 is an interface unit that receives image data sent from the host computer 86. A serial interface or a parallel interface can be applied to the communication interface 70. In this part, a buffer memory (not shown) for speeding up communication may be mounted. Image data sent from the host computer 86 is taken into the inkjet recording apparatus 10 via the communication interface 70 and temporarily stored in the memory 74.

  The memory 74 is a storage unit that temporarily stores an image input via the communication interface 70, and data is read and written through the system controller 72. The memory 74 is not limited to a memory made of a semiconductor element, and a magnetic medium such as a hard disk may be used.

  The system controller 72 includes a central processing unit (CPU) and its peripheral circuits, and functions as a control device that controls the entire inkjet recording apparatus 10 according to a predetermined program, and also functions as an arithmetic device that performs various calculations. . That is, the system controller 72 controls each part such as the communication interface 70, the memory 74, the motor driver 76, the heater driver 78, etc., performs communication control with the host computer 86, read / write control of the memory 74, etc. A control signal for controlling a heater 88 such as a temperature adjusting heater of the ink jet recording apparatus 10 (e.g., discharge head) is generated.

  The memory 74 stores programs executed by the CPU of the system controller 72 and various data necessary for control. Note that the memory 74 may be a non-rewritable storage means or a rewritable storage means such as an EEPROM. The memory 74 is used as a temporary storage area for image data, and is also used as a program development area and a calculation work area for the CPU.

  The motor driver 76 is a driver (drive circuit) that drives the motor 88 in accordance with an instruction from the system controller 72. The heater driver 78 is a driver that drives a heater 89 such as a temperature adjusting heater in the inkjet recording apparatus 10 (such as a discharge head) in accordance with an instruction from the system controller 72.

  The print control unit 80 has a signal processing function for performing various processes and corrections for generating a print control signal from the image data in the memory 74 in accordance with the control of the system controller 72. The generated print data This is a control unit that supplies (dot data) to the ink head driver 84 and the processing liquid head driver 85. Necessary signal processing is performed in the print control unit 80, and the ejection amount and ejection timing of the ink droplets of the ink ejection head 12 (12K, 12C, 12M, 12Y) via the ink head driver 84 based on the image data. Is controlled. Similarly, the processing liquid discharge amount and the discharge timing of the processing liquid discharge head 14 (14K, 14C, 14M, 14Y) are controlled via the processing liquid head driver 85 based on the image data. Thereby, a desired dot size and dot arrangement are realized.

  The print control unit 80 includes an image buffer memory 82, and image data, parameters, and other data are temporarily stored in the image buffer memory 82 when image data is processed in the print control unit 80. Also possible is an aspect in which the print controller 80 and the system controller 72 are integrated and configured with one processor.

  The ink head driver 84 drives the piezoelectric element 58 (see FIG. 3) of each ink discharge head 12 based on the print data given from the print control unit 80. Similarly, the processing liquid head driver 85 drives the piezoelectric element 58 (see FIG. 3) of each processing liquid discharge head 14 based on the print data. Each of the head drivers 84 and 85 may include a feedback control system for keeping the head driving conditions constant.

  The light source driver 92 functions as a control block that controls on / off (irradiation timing, irradiation time), irradiation light amount, and the like of each UV light irradiation unit 26 (26K, 26C, 26M, 26Y). That is, on / off of each UV light irradiation unit 26 is controlled based on a control signal given from the print control unit 80, and the irradiation amount of each UV light irradiation unit 26 is set.

  Data of an image to be printed is input from the outside via the communication interface 70 and stored in the memory 74. At this stage, RGB image data is stored in the memory 74.

  The image data stored in the memory 74 is sent to the print control unit 80 via the system controller 72, where it is converted into dot data for the treatment liquid and dot data for each color ink. That is, the print control unit 80 performs processing for converting the input RGB image data into dot data of four colors of processing liquid and KCMY. Each dot data generated by the print controller 80 is stored in the image buffer memory 82.

  The head drivers 84 and 85 generate drive control signals for the ejection heads 12 and 14 based on the dot data stored in the image buffer memory 82. When the drive control signals generated by the head drivers 84 and 85 are applied to the ejection heads 12 and 14, ink of each color and processing liquid are ejected from the ejection heads 12 and 14, respectively. An image is formed on the recording medium 16 by controlling the ejection of the ejection heads 12 and 14 in synchronization with the conveyance speed of the recording medium 16.

  The dots formed by the treatment liquid may be in contact with each color ink corresponding to the dots of the treatment liquid, and the dot size of the treatment liquid may be larger than the dot size of each color ink. May be lower than the dot arrangement density of each color ink. That is, the dot data of the treatment liquid and the dot data of each color ink may be generated so that the dot data of the treatment liquid is different from the dot data of each color ink.

  Various control programs are stored in the program storage unit 90 of FIG. 4, and the control programs are read and executed in accordance with commands from the system controller 72. The program storage unit 90 may use a semiconductor memory such as a ROM or an EEPROM, or may use a magnetic disk or the like. An external interface may be provided and a memory card or PC card may be used. Of course, you may provide several storage media among these storage media. The program storage unit 90 may also be used as a recording means (not shown) for operating parameters.

  In this example, the system controller 72, the memory 74, the print control unit 80, and the like are illustrated as individual blocks as functional blocks, but these may be integrated and configured as one processor. Further, a part of the function of the system controller 72 and a part of the function of the print control unit 80 can be realized as one processor.

[Description of treatment liquid and ink (ink set)]
The ink set applied to the inkjet recording apparatus 10 according to the present invention will be described in detail. The ink jet recording apparatus 10 shown in this example is composed of a treatment liquid containing a polymerization initiator, a diffusion inhibitor, and oil (a high boiling point solvent), a polymerizable compound, and each color ink containing a coloring material. An ink set is used.

<Polymerizable compounds (radiation curable monomers and oligomers)>
The polymerizable compound refers to a compound having a function of causing a polymerization reaction and curing by an initiating species such as a radical generated from a polymerization initiator described later.

  It is preferably an addition polymerizable compound having at least one ethylenically unsaturated double bond, and is preferably selected from polyfunctional compounds having at least one terminal ethylenically unsaturated bond, more preferably two or more. Such compound groups are widely known in the industrial field, and these can be used without any particular limitation. These include, for example, those having chemical forms such as monomers, prepolymers, that is, dimers, trimers and oligomers, or mixtures thereof and copolymers thereof.

  The polymerizable compound preferably has a polymerizable group such as an acryloyl group, a methacryloyl group, an allyl group, a vinyl group, or an internal double bond group (such as maleic acid) in the molecule, and among them, an acryloyl group or a methacryloyl group. A compound having a group is preferable because it can cause a curing reaction with low energy.

  Only one type of polymerizable compound may be used in one liquid, or two or more types may be used in combination.

  As a content rate of the polymeric compound contained in the 2nd liquid containing a coloring agent, the range of 50-99 mass% is preferable in a 2nd liquid, The range of 70-99 mass% is more preferable, 80-99 A range of mass% is more preferred.

<Polymerization initiator (curing initiator, reaction initiator)>
The polymerization initiator refers to a compound that generates an initiation species such as a radical by the energy of light, heat, or both, and initiates and accelerates the polymerization of the polymerizable compound, and is a known thermal polymerization initiator or bond dissociation energy. A compound having a small bond, a photopolymerization initiator and the like can be selected and used.

  Examples of such radical generator include organic halogenated compounds, carbonyl compounds, organic peroxide compounds, azo polymerization initiators, azide compounds, metallocene compounds, hexaarylbiimidazole compounds, organic boric acid compounds, disulfonic acid compounds, oniums. Examples thereof include salt compounds.

  In the ink set of the present invention, a polymerization initiator for curing the polymerizable compound is contained in at least one of the plurality of types of liquids used.

  The content of the polymerization initiator is preferably 0.5 to 20% by mass, and 1 to 15% by mass with respect to the total polymerizable compound used in the ink set from the viewpoints of stability over time, curability, and curing rate. More preferred is 3 to 10% by mass.

  A polymerization initiator can be used 1 type or in combination of 2 or more types. Further, as long as the effects of the present invention are not impaired, a known sensitizer can be used in combination for the purpose of improving sensitivity.

<Colorant (coloring material)>
The colorant used in the present invention is not particularly limited, and can be appropriately selected from known water-soluble dyes, oil-soluble dyes and pigments as long as they can achieve a hue and color density suitable for the intended use of the ink. be able to. Among these, the liquid constituting the ink for ink jet recording of the present invention is preferably a water-insoluble liquid and does not contain an aqueous solvent from the viewpoint of ink droplet stability and quick drying, and from such a viewpoint It is preferable to use an oil-soluble dye or pigment that is easily dispersed and dissolved in a water-insoluble liquid.

  There is no restriction | limiting in particular in the oil-soluble dye which can be used for this invention, Arbitrary things can be used. The content of the dye when using an oil-soluble dye as the colorant is preferably in the range of 0.05 to 20% by mass, more preferably 0.1 to 15% by mass, and more preferably 0.2 to 0.2% in terms of solid content. 6% by mass is particularly preferred.

  An embodiment in which a pigment is used as the colorant is also preferable from the viewpoint that aggregation easily occurs when a plurality of liquids are mixed.

  As the pigment used in the present invention, either an organic pigment or an inorganic pigment can be used, and as the black pigment, a carbon black pigment or the like is preferably exemplified. In general, pigments of three primary colors of black and cyan, magenta, and yellow are used, but pigments having other hues such as red, green, blue, brown, white, gold, silver, etc. The metallic luster pigment, colorless or light-colored extender pigment, and the like can also be used depending on the purpose.

  In addition, particles having silica, alumina, resin, or the like as a core material and having a dye or pigment fixed on the surface, an insoluble raked product of a dye, a colored emulsion, a colored latex, or the like can also be used as a pigment.

  Furthermore, resin-coated pigments can also be used. This is called a microcapsule pigment, and is also available as a commercial product from Dainippon Ink and Chemicals, Toyo Ink, etc.

  The volume average particle diameter of the pigment particles contained in the liquid in the present invention is preferably in the range of 30 to 250 nm, more preferably 50 to 200 nm, from the viewpoint of balance between optical density and storage stability. . Here, the volume average particle diameter of the pigment particles can be measured by a measuring device such as LB-500 (manufactured by HORIBA).

  The content in the case of using a pigment as the colorant is preferably in the range of 0.1% by mass to 20% by mass in terms of solid content in the second liquid, from the viewpoint of optical density and jet stability. More preferably, it is in the range of 1% by mass to 10% by mass.

  The colorant may be used alone or in combination of two or more. Further, different colorants may be used for each liquid, or the same may be used.

<Diffusion inhibitor (polymer, polymer)>
In the present invention, the diffusion preventing agent refers to the first liquid in order to prevent diffusion and bleeding of the second liquid having the colorant deposited on the first liquid applied to the recording medium. Refers to the substance contained.

  The diffusion inhibitor contains at least one selected from the group consisting of a polymer having an amino group, a polymer having an onium group, a polymer having a nitrogen-containing heterocycle, and a metal compound.

  The said polymer etc. may use single type and may use it in combination of multiple types. “Multiple species” refers to, for example, different genus species that belong to polymers having an amino group but have different structures, or a relationship between a polymer having an amino group and a polymer having an onium group. Including some cases. Further, an amino group, an onium group, a nitrogen-containing heterocycle, and a metal compound may be combined in one molecule.

  Further, these polymers will be described in detail below.

(Polymer having amino group)
The polymer having an amino group may be a homopolymer only of a monomer having an amino group, or may be a copolymer of a monomer having an amino group and another monomer. In the polymer having an amino group, the monomer having an amino group is preferably 10 mol% or more and 100 mol% or less, and more preferably 20 mol% or more and 100 mol% or less.

  Examples of the monomer having an amino group include N, N-dimethylaminoethyl (meth) acrylate, N, N-diethylaminoethyl (meth) acrylate, N, N-dimethylaminopropyl (meth) acrylate, and N, N-diethylamino. Propyl (meth) acrylate, N, N-dimethylaminoethyl (meth) acrylamide, N, N-diethylaminoethyl (meth) acrylamide, N, N-dimethylaminopropyl (meth) acrylamide, N, N-diethylaminopropyl (meth) Acrylamide, diallylamine, N-methyldiallylamine, N-vinylbenzyl-N, N-dimethylamine, N-vinylbenzyl-N, N-diethylamine, N-vinylbenzyl-N-ethyl-N-methylamine, N-vinylbenzyl -N, N-dihexyl N-vinylbenzyl-N-octadecyl-N-methylamine, N-vinylbenzyl-N′-methyl-piperazine, N-vinylbenzyl-N ′-(2-hydroxyethyl) -piperazine, N-benzyl-N -Methylaminoethyl (meth) acrylate, N, N-dibenzylaminoethyl (meth) acrylate and the like.

  Among these, N, N-dimethylaminoethyl (meth) acrylate, N, N-diethylaminoethyl (meth) acrylate, N, N-dimethylaminopropyl (meth) acrylate, N, N-diethylaminopropyl (meth) acrylate, N, N-dimethylaminoethyl (meth) acrylamide, N, N-diethylaminoethyl (meth) acrylamide, N, N-dimethylaminopropyl (meth) acrylamide, and N, N-diethylaminopropyl (meth) acrylamide are more preferable, Furthermore, N, N-dimethylaminoethyl (meth) acrylate, N, N-diethylaminoethyl (meth) acrylate, and N, N-dimethylaminopropyl (meth) acrylamide are particularly preferable.

  Examples of monomers copolymerizable with these monomers include (meth) acrylic acid alkyl esters [for example, methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, (meth ) Isopropyl acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, t-butyl (meth) acrylate, hexyl (meth) acrylate, octyl (meth) acrylate, (meth) acrylic acid 2 -(Meth) acrylic acid alkyl ester having 1 to 18 carbon atoms in the alkyl moiety, such as ethylhexyl, lauryl (meth) acrylate, stearyl (meth) acrylate, etc.], (meth) acrylic acid cycloalkyl ester [( Meth) acrylic acid cyclohexyl etc.], (meth) acrylic acid aryl ester [(meth) acrylic Phenyl etc.], (meth) acrylic acid aralkyl esters [(meth) benzyl benzyl etc.], substituted (meth) acrylic acid alkyl esters [eg (meth) acrylic acid 2-hydroxyethyl etc.], (meth) acrylamides [ For example, (meth) acrylamide, dimethyl (meth) acrylamide, etc.], aromatic vinyl [styrene, vinyl toluene, α-methylstyrene, etc.], vinyl esters [vinyl acetate, vinyl propionate, vinyl versatate, etc.], allyl Examples include esters [such as allyl acetate], halogen-containing monomers [such as vinylidene chloride and vinyl chloride], vinyl cyanides [such as (meth) acrylonitrile], and olefins [such as ethylene and propylene].

  Among these copolymerizable monomers, alkyl (meth) acrylate having an alkyl group having 1 to 8 carbon atoms, benzyl (meth) acrylate, and styrene are preferable, ethyl (meth) acrylate, ( Particularly preferred are propyl (meth) acrylate, n-butyl (meth) acrylate, n-hexyl (meth) acrylate, and 2-ethylhexyl (meth) acrylate.

  Furthermore, other polymers having an amino group include polyallylamine, polyvinylamine, polyethyleneimine, polydiallylamine, poly (N-methyldiallylamine), poly (N-ethyldiallylamine), and modified products thereof (polyallylamine Benzyl chloride adducts, phenylglycidyl ether adducts, acrylonitrile adducts), diisocyanates (eg hexamethylene diisocyanate, isophorone diisocyanate, toluene diisocyanate, xylylene diisocyanate) and diols having tertiary amino groups (eg N-methyldiethanolamine) , N-ethyldiethanolamine, N, N′-3-hydroxypropylpiperazine) and the like.

  Among these, polyallylamine, polyvinylamine, polyethyleneimine, and modified products thereof are more preferable, and further, a modified product of polyallylamine is particularly preferable.

  In the present invention, the polymer having an amino group is particularly preferably a polymer having a unit represented by the following general formula (1).

In general formula (1), R ¹¹ represents hydrogen or a methyl group, Y represents O or NR ¹⁵ , R ¹⁵ represents hydrogen or an alkyl group, R ¹² represents a divalent linking group, R ¹³ and R ¹⁴ each independently represents an alkyl group, an aralkyl group or an aryl group.

R ¹¹ is more preferably hydrogen, Y is more preferably O or NH, more preferably O, and R ¹³ and R ¹⁴ are more preferably alkyl groups or aralkyl groups, and more preferably alkyl groups. .

The divalent linking group represented by R ¹² is preferably an alkylene group or an arylene group, and more preferably an alkylene group.

  Specific examples of the divalent linking group include methylene group, ethylene group, propylene group, trimethylene group, tetramethylene group, hexamethylene group, octamethylene group, phenylene group, 2-hydroxypropylene group, etc. Among these, an ethylene group, a propylene group, and a trimethylene group are particularly preferable.

The alkyl group represented by R ¹³ , R ¹⁴ and R ¹⁵ is preferably an alkyl group having 18 or less carbon atoms, more preferably an alkyl group having 12 or less carbon atoms, and particularly preferably an alkyl group having 8 or less carbon atoms. The alkyl group may be linear or cyclic and may have a substituent. Examples of the substituent include a hydroxy group, an alkoxy group (for example, a methoxy group, an ethoxy group, Propoxy group etc.), aryloxy group (eg phenoxy group etc.), amino group, carbamoyl group, halogen atom and the like.

  Specific examples of the (substituted) alkyl group include methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group, t-butyl group, n-hexyl group, cyclohexyl group, and 2-ethylhexyl. Group, n-octyl group, n-nonyl group, n-decyl group, n-dodecyl group, n-octadecyl group, hydroxyethyl group, 1-hydroxypropyl group, N, N-dimethylaminoethyl group, methoxyethyl group, A chloroethyl group etc. are mentioned. Among these, methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group, t-butyl group, n-hexyl group, cyclohexyl group, 2-ethylhexyl group, n-octyl group, n -Nonyl group and n-decyl group are more preferable, and methyl group, ethyl group, n-propyl group, n-butyl group and n-hexyl group are particularly preferable.

The aryl group represented by R ¹³ and R ¹⁴ is preferably an aryl group having 18 or less carbon atoms, more preferably an aryl group having 16 or less carbon atoms, and particularly preferably an aryl group having 12 or less carbon atoms. The aryl group may have a substituent.

  Specific examples of the (substituted) aryl group include phenyl group, alkylphenyl group (for example, methylphenyl group, ethylphenyl group, n-propylphenyl group, n-butylphenyl group, cumenyl group, mesityl group, tolyl group, Xylyl group, etc.), naphthyl group, chlorophenyl group, dichlorophenyl group, trichlorophenyl group, bromophenyl group, hydroxyphenyl group, methoxyphenyl group, acetoxyphenyl group, cyanophenyl group, etc., among which phenyl group, naphthyl group Is particularly preferred.

The aralkyl group represented by R ¹³ and R ¹⁴ is preferably an aralkyl group having 18 or less carbon atoms, more preferably an aralkyl group having 16 or less carbon atoms, and particularly preferably an aralkyl group having 12 or less carbon atoms. Examples of the alkyl part of the aralkyl group include the above alkyl groups, and examples of the aryl part of the aralkyl group include the above aryl groups. The aralkyl group may have a substituent.

  Specific examples of the (substituted) aralkyl group include a benzyl group, a phenylethyl group, a vinylbenzyl group, a hydroxyphenylmethyl group, a diphenylmethyl group, a trityl group, and a styryl group. Among these, a benzyl group is particularly preferable. preferable.

  Preferable specific examples of the polymer having a unit represented by the general formula (1) include the following polymers.

  Preferred polymers other than the polymer having an amino group according to the present invention and having a unit represented by the general formula (1) include the following polymers.

  The polymer having the unit represented by the general formula (1) can be synthesized using radical (co) polymerization. Examples of the radical (co) polymerization include bulk polymerization, solution polymerization, and emulsion polymerization. These known methods can be used. In addition, it is not limited to this method, Other well-known methods can also be employ | adopted.

  In the present invention, the weight average molecular weight of the polymer having an amino group is preferably 1000 to 50000, and particularly preferably 2000 to 30000.

  The polymer having an amino group is preferably contained in at least one liquid not containing a colorant, and the preferred amount of the polymer having an amino group in the present invention is based on the whole of the plurality of liquids. 1% by mass to 90% by mass is preferable, 10% by mass to 75% by mass is more preferable, and 20% by mass to 50% by mass is particularly preferable. If the amount used is less than the above-mentioned amount, the effect of the present invention may not be exhibited effectively. If the amount is too large, the viscosity becomes high, which may cause a problem in the dischargeability of the ink liquid.

(Polymer having onium group)
The polymer having an onium group may be a homopolymer of only a monomer having an onium group, or may be a copolymer of a monomer having an onium group and another monomer. In the constitution of the polymer having an onium group, the monomer having an onium group is preferably 10 mol% or more, and more preferably 20 mol% or more.

  Examples of the onium group include an ammonium group, a phosphonium group, and a sulfonium group, and an ammonium group is preferable. The polymer having an ammonium group can be obtained as a homopolymer of a monomer having a quaternary ammonium base, a copolymer of the monomer and another monomer, or a condensation polymer.

  In the present invention, the polymer having an ammonium group is particularly preferably a polymer having at least a unit represented by the following general formula (2) or (3).

In the formula, R represents a hydrogen atom or a methyl group, and R ^{21 to} R ²³ and R ^{25 to} R ²⁷ each independently represents an alkyl group, an aralkyl group, or an aryl group. R ²⁴ represents an alkylene group, an aralkylene group, or an arylene group. Y represents O or NR ′, and R ′ represents a hydrogen atom or an alkyl group. X ⁻ represents a counter anion.

The alkyl group represented by R ^{21 to} R ²³ and R ^{25 to} R ²⁷ preferably has 18 or less carbon atoms, more preferably 16 or less carbon atoms, and particularly preferably 12 or less carbon atoms. The alkyl group may be linear or cyclic, and may have a substituent. Examples of the substituent include an alkoxy group, an aryloxy group, a halogen atom, a hydroxyl group, a carbamoyl group, and an amino group.

  Specific examples of the (substituted) alkyl group include methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group, t-butyl group, n-hexyl group, cyclohexyl group, and 2-ethylhexyl. Group, n-octyl group, n-nonyl group, n-decyl group, n-dodecyl group, n-octadecyl group, hydroxyethyl group, 1-hydroxypropyl group, N, N-dimethylaminoethyl group, methoxyethyl group, A chloroethyl group etc. are mentioned.

  Among these alkyl groups, methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group, t-butyl group, n-hexyl group, cyclohexyl group, 2-ethylhexyl group, n-octyl group , N-nonyl group and n-decyl group are preferable, and methyl group, ethyl group, n-propyl group, n-butyl group and n-hexyl group are particularly preferable.

The aryl group represented by R ^{21 to} R ²³ and R ^{25 to} R ²⁷ preferably has 18 or less carbon atoms, more preferably 16 or less carbon atoms, and particularly preferably 12 or less carbon atoms. The aryl group may have a substituent, and examples of the substituent include an alkyl group, an alkoxy group, an aryloxy group, a halogen atom, a hydroxyl group, a carbamoyl group, a cyano group, and an amino group.

  Specific examples of the (substituted) aryl group include phenyl group, alkylphenyl group (for example, methylphenyl group, ethylphenyl group, n-propylphenyl group, n-butylphenyl group, cumenyl group, mesityl group, tolyl group, Xylyl group, etc.), naphthyl group, chlorophenyl group, dichlorophenyl group, trichlorophenyl group, bromophenyl group, hydroxyphenyl group, methoxyphenyl group, acetoxyphenyl group, cyanophenyl group and the like.

  Among these (substituted) aryl groups, a phenyl group and a naphthyl group are particularly preferable.

The aralkyl group represented by R ^{21 to} R ²³ and R ^{25 to} R ²⁷ preferably has 18 or less carbon atoms, more preferably 16 or less carbon atoms, and particularly preferably 12 or less carbon atoms. Examples of the alkyl part of the aralkyl group include the above alkyl groups, and examples of the aryl part of the aralkyl group include the above aryl groups. The alkyl part and / or aryl part of the aralkyl group may have a substituent, and the substituent is the same as the substituents exemplified for the alkyl group and aryl group.

  Specific examples of the (substituted) aralkyl group include a benzyl group, a phenylethyl group, a vinylbenzyl group, a hydroxyphenylmethyl group, a diphenylmethyl group, a trityl group, and a styryl group.

  Of these (substituted) aralkyl groups, a benzyl group is particularly preferred.

R ^{21 to} R ²³ and R ^{25 to} R ²⁷ are particularly preferably each independently an alkyl group or an aralkyl group, and among them, a methyl group, an ethyl group, a hexyl group, and a benzyl group are preferable.

R ²⁴ represents a divalent linking group, preferably an alkylene group, an aralkylene group, or an arylene group.

The alkylene group represented by R ²⁴ preferably has 8 or less carbon atoms, more preferably 6 or less carbon atoms, and particularly preferably 4 or less carbon atoms. The alkylene group may be linear or cyclic, and may have a substituent. Examples of the substituent include an alkoxy group, an aryloxy group, a halogen atom, a hydroxyl group, and a carbamoyl group. And amino groups.

  Specific examples of the (substituted) alkylene group include methylene group, ethylene group, propylene group, trimethylene group, tetramethylene group, hexamethylene group, octamethylene group, 2-hydroxyethylene group, 2-hydroxypropylene group, 2- A methoxypropylene group etc. are mentioned.

  Of these (substituted) alkylene groups, a methylene group, an ethylene group, a propylene group, a trimethylene group, and a 2-hydroxypropylene group are particularly preferable.

The arylene group represented by R ²⁴ preferably has 12 or less carbon atoms, more preferably 10 or less carbon atoms, and particularly preferably 8 or less carbon atoms. The arylene group may have a substituent, and the substituent is the same as the substituent exemplified for the aryl group.

  Specific examples of the (substituted) arylene group include a phenylene group, an alkylphenylene group (for example, 2-ethyl-1,4-phenylene group, 2-propyl-1,4-phenylene group, etc.), 2-chloro-1 , 4-phenylene group, alkoxyphenylene group (for example, 2-methoxy-1,4-phenylene group, etc.), among which phenylene group is particularly preferable.

The aralkylene group represented by R ²⁴ preferably has 12 or less carbon atoms, more preferably 10 or less carbon atoms, and particularly preferably 8 or less carbon atoms. Examples of the alkyl portion of the aralkylene group include the above alkyl groups, and examples of the aryl portion of the aralkylene group include the above aryl groups. The aralkylene group may have a substituent, and the substituent is the same as the substituents exemplified for the alkyl group and aryl group.

  Specific examples of the (substituted) aralkylene group include a xylylene group and a benzylidene group, and a benzylidene group is particularly preferable.

R ²⁴ is particularly preferably an alkylene group, and among them, an ethylene group or a propylene group is preferable.

As the alkyl group represented by R ′, those similar to the alkyl groups represented by R ^{21 to} R ²³ and R ^{25 to} R ²⁷ are preferable. The same applies to preferred embodiments.

  —Y— is particularly preferably —O— or —NH—.

X ⁻ is a counter anion, which is a halogen ion (Cl ⁻ , Br ⁻ , I ⁻ ), a sulfonate ion, an alkyl sulfonate ion, an aryl sulfonate ion, an alkyl carboxylate ion, an aryl carboxylate ion, PF ₆ ⁻ , BF _4- ^{and the} like can be mentioned. Of these, Cl ⁻ , Br ⁻ , toluenesulfonic acid ions, methanesulfonic acid ions, PF ₆ ⁻ and BF ₄ ⁻ are particularly preferable.

  In the case of a polymer having a unit represented by the general formula (2) or (3), the unit represented by the general formula (2) or (3) is preferably contained in an amount of 10 to 100 mol% in the polymer. The case where it contains 20-100 mol% is more preferable.

  Preferable specific examples of the polymer having a unit represented by the general formula (2) or (3) include the following polymers.

  Examples of the polymer having an onium group according to the present invention other than the polymer having a unit represented by the general formula (2) or (3) include an epichlorohydrin-dimethylamine addition polymer, a dihalide compound ( For example, xylylene dichloride, xylylene dibromide, 1,6-dibromohexane) and diamine (N, N, N ′, N′-tetramethylethylenediamine, N, N, N ′, N′-tetramethylhexamethylenediamine), N, N′-dimethylpiperazine, diazabicyclooctane) addition polymerization products, and the like.

  Further, polymers having amino groups (for example, polyallylamine, polyvinylamine, polyethyleneimine, polydiallylamine, poly (N-methyldiallylamine), poly (N-ethyldiallylamine), diisocyanates (for example, hexamethylene diisocyanate, isophorone diisocyanate, toluene) Diisocyanate, xylylene diisocyanate) and diols having tertiary amino groups (for example, polyadducts of N-methyldiethanolamine, N-ethyldiethanolamine, N, N′-3-hydroxypropylpiperazine, etc.)) with methyl chloride, ethyl Chloride, methyl bromide, ethyl bromide, methyl iodide, ethyl iodide, dimethyl sulfate, diethyl sulfate, methyl p-toluenesulfonate, p-toluene It can also be obtained by adding acid ethyl.

  Among these, preferred examples include the following specific examples.

  The polymer having a unit represented by the general formula (2) or (3) can be obtained as a homopolymer of the following monomer having an ammonium group or a copolymer containing the monomer.

  Examples of the monomer having an ammonium group include trimethyl-p-vinylbenzylammonium chloride, trimethyl-m-vinylbenzylammonium chloride, triethyl-p-vinylbenzylammonium chloride, triethyl-m-vinylbenzylammonium chloride, N , N-dimethyl-N-ethyl-Np-vinylbenzylammonium chloride, N, N-diethyl-N-methyl-Np-vinylbenzylammonium chloride, N, N-dimethyl-Nn-propyl-N -P-vinylbenzylammonium chloride, N, N-dimethyl-Nn-octyl-Np-vinylbenzylammonium chloride, N, N-dimethyl-N-benzyl-Np-vinylbenzylammonium chloride, N, N Diethyl-N-benzyl-Np-vinylbenzylammonium chloride, N, N-dimethyl-N- (4-methyl) benzyl-Np-vinylbenzylammonium chloride, N, N-dimethyl-N-phenyl-N -P-vinylbenzylammonium chloride, trimethyl-p-vinylbenzylammonium bromide, trimethyl-m-vinylbenzylammonium bromide, trimethyl-p-vinylbenzylammonium sulfonate, trimethyl-m-vinylbenzylammonium sulfonate, trimethyl-p-vinylbenzyl Ammonium acetate, trimethyl-m-vinylbenzylammonium acetate, N, N, N-triethyl-N-2- (4-vinylphenyl) ethylammonium chloride, N, N, N- Liethyl-N-2- (3-vinylphenyl) ethylammonium chloride, N, N-diethyl-N-methyl-N-2- (4-vinylphenyl) ethylammonium chloride, N, N-diethyl-N-methyl- N-2- (4-vinylphenyl) ethylammonium acetate, trimethyl-2- (methacryloyloxy) ethylammonium chloride, triethyl-2- (methacryloyloxy) ethylammonium chloride, trimethyl-2- (acryloyloxy) ethylammonium chloride, Triethyl-2- (acryloyloxy) ethylammonium chloride, trimethyl-3- (methacryloyloxy) propylammonium chloride, triethyl-3- (methacryloyloxy) propylammonium chloride Trimethyl-2- (methacryloylamino) ethylammonium chloride, triethyl-2- (methacryloylamino) ethylammonium chloride, trimethyl-2- (acryloylamino) ethylammonium chloride, triethyl-2- (acryloylamino) ethylammonium chloride, Trimethyl-3- (methacryloylamino) propylammonium chloride, triethyl-3- (methacryloylamino) propylammonium chloride, trimethyl-3- (acryloylamino) propylammonium chloride, triethyl-3- (acryloylamino) propylammonium chloride, N, N-dimethyl-N-ethyl-2- (methacryloyloxy) ethylammonium chloride, N, N-die -N-methyl-2- (methacryloyloxy) ethylammonium chloride, N, N-dimethyl-N-ethyl-3- (acryloylamino) propylammonium chloride, trimethyl-2- (methacryloyloxy) ethylammonium bromide, trimethyl-3 -(Acryloylamino) propylammonium bromide, trimethyl-2- (methacryloyloxy) ethylammonium sulfonate, trimethyl-3- (acryloylamino) propylammonium acetate, monomethyldiallylammonium chloride, dimethyldiallylammonium chloride, allylamine hydrochloride, etc. Can do.

  Examples of monomers copolymerizable with these monomers include (meth) acrylic acid alkyl esters [for example, methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, (meth ) Isopropyl acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, t-butyl (meth) acrylate, hexyl (meth) acrylate, octyl (meth) acrylate, (meth) acrylic acid 2 -(Meth) acrylic acid C1-18 alkyl ester such as ethylhexyl, (meth) acrylic acid lauryl, stearyl (meth) acrylate], (meth) acrylic acid cycloalkyl ester [(meth) acrylic acid cyclohexyl etc.], ( (Meth) acrylic acid aryl esters [phenyl (meth) acrylate etc.], aralkyl Steal [benzyl (meth) acrylate, etc.], substituted (meth) acrylic acid alkyl ester [eg, 2-hydroxyethyl (meth) acrylate, etc.], (meth) acrylamides [eg, (meth) acrylamide, dimethyl (meth) ) Acrylamide, etc.], aromatic vinyls [styrene, vinyl toluene, α-methyl styrene, etc.], vinyl esters [vinyl acetate, vinyl propionate, vinyl versatate, etc.], allyl esters [eg, allyl acetate], halogen-containing Monomers [vinylidene chloride, vinyl chloride, etc.], vinyl cyanides [(meth) acrylonitrile, etc.], olefins [ethylene, propylene, etc.] and the like.

  Among these copolymerizable monomers, (meth) acrylic acid alkyl esters, (meth) acrylamides, and aromatic vinyls are preferable, methyl (meth) acrylate, ethyl (meth) acrylate, (meth) ) Propyl acrylate, isopropyl (meth) acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, t-butyl (meth) acrylate, hexyl (meth) acrylate, octyl (meth) acrylate Particularly preferred are 2-ethylhexyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, and styrene.

  These polymers can be synthesized by radical (co) polymerization of the monomers. As the radical polymerization, known methods such as bulk polymerization, solution polymerization, and emulsion polymerization can be used. Further, if necessary, a polymerization initiation catalyst known to those skilled in the art can be used.

  The polymer having an onium group according to the present invention preferably has a weight average molecular weight of 1,000 to 50,000, more preferably 2,000 to 30,000.

  The amount of the polymer having an onium group used in the present invention is preferably 1% by mass to 90% by mass, more preferably 10% by mass to 75% by mass, and further preferably 20% by mass to 50% by mass with respect to the plurality of liquids. Mass% is particularly preferred. If the amount used is less than the above-mentioned amount, the effect of the present invention may not be exhibited effectively. If the amount is too large, the viscosity becomes high, which may cause a problem in the dischargeability of the ink liquid.

(Polymer having nitrogen-containing heterocycle)
A polymer having a nitrogen-containing heterocycle is a copolymer of a monomer having a nitrogen-containing heterocycle and another monomer, even if it is a homopolymer of only a monomer having a nitrogen-containing heterocycle. May be. In the constitution of the polymer having a nitrogen-containing heterocycle, the monomer having a nitrogen-containing heterocycle is preferably 10 mol% or more, and more preferably 20 mol% or more.

  Here, specific examples of the nitrogen-containing heterocycle include saturated heterocycles (for example, aziridine, azetidine, pyrrolidine, piperidine, piperazine, morpholine, thiomorpholine, caprolactam, valerolactam), and unsaturated heterocycles ( Examples thereof include imidazole, pyridine, pyrrole, pyrazole, pyrazine, pyrimidine, indole, purine, quinoline, and triazine.

  These nitrogen-containing heterocycles may further have a substituent, and examples of the substituent include an alkyl group, an aryl group, an alkoxy group, an aryloxy group, a halogen atom, a hydroxyl group, a carbamoyl group, and an amino group. It is done.

The polymer according to the present invention is preferably a polymer obtained from a vinyl monomer having these nitrogen-containing heterocycles. Specifically, N-vinylpyrrolidone, N-vinylcaprolactam, acryloylmorpholine, acryloylthiomorpholine, N-vinylimidazole, 2-methyl-1-vinylimidazole, 2-vinylpyridine, 4-vinylpyridine, N-vinylcarbazole N-methylmaleimide, N-ethylmaleimide, 2-isopropenyl-2-oxazoline and the like. Of these, N-vinylimidazole, 2-vinylpyridine, and 4-vinylpyridine are particularly preferable.
Furthermore, the polymer according to the present invention may be a copolymer of the monomer and a monomer copolymerizable therewith. Examples of the copolymerizable monomer include (meth) acrylic acid alkyl esters [for example, methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, isopropyl (meth) acrylate, ( N-butyl (meth) acrylate, isobutyl (meth) acrylate, t-butyl (meth) acrylate, hexyl (meth) acrylate, octyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, (meth) (Meth) acrylic acid C1-18 alkyl ester such as lauryl acrylate and stearyl (meth) acrylate], (meth) acrylic acid cycloalkyl ester [(meth) acrylic acid cyclohexyl etc.], (meth) acrylic acid aryl ester [(Meth) phenyl acrylate, etc.], aralkyl esters [(meta Benzyl acrylate etc.], substituted (meth) acrylic acid alkyl esters [eg (2-hydroxyethyl (meth) acrylate)], (meth) acrylamides [eg (meth) acrylamide, dimethyl (meth) acrylamide etc.], Aromatic vinyls [styrene, vinyltoluene, α-methylstyrene, etc.], vinyl esters [vinyl acetate, vinyl propionate, vinyl versatate, etc.], allyl esters [eg, allyl acetate], halogen-containing monomers [salts] Vinylidene, vinyl chloride, etc.], vinyl cyanide [(meth) acrylonitrile, etc.], olefins [ethylene, propylene, etc.] and the like.

  Among these copolymerizable monomers, (meth) acrylic acid alkyl esters, (meth) acrylamides, and aromatic vinyls are preferable, methyl (meth) acrylate, ethyl (meth) acrylate, (meth) ) Propyl acrylate, isopropyl (meth) acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, t-butyl (meth) acrylate, hexyl (meth) acrylate, octyl (meth) acrylate Particularly preferred are 2-ethylhexyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, and styrene.

  In the structure of the polymer having a nitrogen-containing hetero ring, the monomer having a nitrogen-containing hetero ring is preferably 10 mol% or more and 100 mol% or less, and 20 mol% or more and 100 mol% or less. Is more preferable.

  These polymers can be synthesized by radical (co) polymerization of the monomers. As the radical polymerization, known methods such as bulk polymerization, solution polymerization, and emulsion polymerization can be used. Further, if necessary, a polymerization initiation catalyst known to those skilled in the art can be used.

  Furthermore, the polymer according to the present invention may be obtained by polycondensation. 2,4-dichlorotriazine (for example, 2,4-dichloro-6-butylamino-1,3,5-triazine) and diamine (for example, N, N′-dimethylethylenediamine, N, N′-dimethylhexamethylenediamine, N, N′-dibutylhexamethylenediamine, N, N′-dioctylhexamethylenediamine, etc.) or a polycondensation obtained by polycondensation of piperazine and a dicarboxylic acid (for example, adipic acid) ester. A coalescence can also be mentioned.

  The following specific examples can be given as preferred nitrogen-containing heterocyclic polymers.

  Furthermore, the following polymers can also be mentioned as preferable specific examples.

  The polymer having a nitrogen-containing heterocycle according to the present invention preferably has a weight average molecular weight of 1,000 to 50,000, more preferably 2,000 to 30,000.

  The amount of the polymer containing a nitrogen-containing heterocycle in the present invention is preferably 1% by mass to 90% by mass, more preferably 10% by mass to 75% by mass, and more preferably 20% by mass with respect to the plurality of liquids. ˜50 mass% is particularly preferred. If the amount used is less than the above-mentioned amount, the effect of the present invention may not be exhibited effectively. If the amount used is too large, the viscosity becomes high, which may cause a problem in the dischargeability of the ink liquid.

(Metal compound)
Examples of metal compounds include aliphatic carboxylic acids (for example, acetic acid, propionic acid, butyric acid, valeric acid, isovaleric acid, pivalic acid, lauric acid, myristic acid, palmitic acid, stearic acid, 2-ethylhexanoic acid, lactic acid, pyruvic acid, etc. ), Metal salts of aromatic carboxylic acids (for example, benzoic acid, salicylic acid, phthalic acid, cinnamic acid, etc.), aliphatic sulfonic acids (for example, methanesulfonic acid, ethanesulfonic acid, propanesulfonic acid, hexanesulfonic acid, 2 -Ethyl hexane sulfonic acid, etc.) metal salts, aromatic sulfonic acids (benzene sulfonic acid, naphthalene sulfonic acid, etc.) metal salts, 1,3-diketone metal compounds, among these, aliphatic carboxylic acid metals A salt or a 1,3-diketone metal compound is preferred.

  The aliphatic carboxylic acid may be linear, branched or cyclic, preferably has 2 to 40 carbon atoms, and more preferably has 6 to 25 carbon atoms. Further, it may have a substituent, and examples of the substituent include an aryl group, an alkoxy group, an aryloxy group, a halogen atom, a hydroxyl group, a carbamoyl group, an amino group, and a carboxy group.

  The aryl group as a substituent is preferably a phenyl group or an alkylphenyl group (for example, methylphenyl group, ethylphenyl group, n-propylphenyl group, n-butylphenyl group, cumenyl group, mesityl group, tolyl group, xylyl group). Group), a naphthyl group, a fluorophenyl group, a dichlorophenyl group, a trichlorophenyl group, a bromophenyl group, a hydroxyphenyl group, a methoxyphenyl group, an acetoxyphenyl group, a cyanophenyl group, and the like, and a phenyl group and a naphthyl group are more preferable.

  The alkoxy group as a substituent is preferably a methoxy group, an ethoxy group, a propoxy group, an isopropoxy group, a butoxy group, a t-butoxy group, a hexyloxy group, a cyclohexyloxy group, a 2-ethylhexyloxy group, an octyloxy group, A dodecyloxy group, more preferably a methoxy group, an ethoxy group, a propoxy group, an isopropoxy group, a butoxy group, or a t-butoxy group.

  The aryloxy group as a substituent is preferably a phenoxy group, a methylphenoxy group, an ethylphenoxy group, a cumenyloxy group, a tolyloxy group, a xylyloxy group, a naphthyloxy group, a chlorophenoxy group, a hydroxyphenoxy group, a methoxyphenoxy group, an acetoxyphenoxy group. Group, more preferably a phenoxy group.

  Examples of the halogen atom as a substituent include a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom.

  The carbamoyl group as a substituent is preferably a carbamoyl group, an alkylcarbamoyl group (for example, a methylcarbamoyl group, an ethylcarbamoyl group, a propylcarbamoyl group, a butylcarbamoyl group, etc.) or an arylcarbamoyl group (for example, a phenylcarbamoyl group). More preferred are a carbamoyl group, a methylcarbamoyl group, and an ethylcarbamoyl group.

  The amino group as a substituent is preferably a primary amino group or an N-substituted amino group (for example, N-methylamino group, N-ethylamino group, N-propylamino group, N-butylamino group, N- Hexylamino group, N-octylamino group, N-benzylamino group), N, N-2 substituted amino group (for example, N, N-dimethylamino group, N, N-diethylamino group, N-methyl-N-ethyl) Amino group, N, N-dibutylamino group, N-ethyl-N-octylamino group, N-methyl-N-benzylamino group), N-methylamino group, N-ethylamino group, N, N-dimethyl. An amino group, N, N-diethylamino group, and N-methyl-N-ethylamino group are more preferable.

  Particularly preferred aliphatic carboxylic acids are n-hexanoic acid, 2-ethylhexanoic acid, n-octanoic acid, lauric acid, myristic acid, palmitic acid, stearic acid, and 2-ethylhexanoic acid. Furthermore, ethylenediaminetetraacetic acid can also be mentioned preferably.

  The 1,3-diketone may be linear, branched or cyclic, preferably has 5 to 40 carbon atoms, and more preferably has 5 to 25 carbon atoms. For example, 2,4-pentadione, 3,5-heptadione, 2,2,6,6-tetramethylheptadione, 4,6-nonadione, 7,9-pentadecadione, 2,4-dimethyl-7,9 -Pentadecadione, 2-acetylcyclopentanone, 2-acetylcyclohexanone, 3-methyl-2,4-pentadione, 3- (2-ethylhexyl) 2,4-pentadione, 3- [4- (2-ethylhexyloxy) ) Benzyl] -2,4-pentadione and the like, and 2,4-pentadione, 7,9-pentadecadione, and 3- [4- (2-ethylhexyloxy) benzyl] -2,4-pentadione are preferable.

  These groups may further have a substituent, and examples of the substituent include an aryl group, an alkoxy group, an aryloxy group, a halogen atom, a hydroxyl group, a carbamoyl group, an amino group, and a carboxy group. More preferable aryl group, alkoxy group, aryloxy group, halogen atom, hydroxyl group, carbamoyl group, and amino group as the substituent are the same as in the case of the aliphatic carboxylic acid.

  Examples of the metal of the metal compound include one selected from the group consisting of zinc, aluminum, calcium, magnesium, iron, cobalt, nickel, and copper. Among them, zinc, aluminum, and nickel are preferable, and zinc is particularly preferable. Is preferred.

  Examples of preferred metal salts of aliphatic carboxylic acids in the present invention include the following.

  Furthermore, the following specific examples can be given as preferred 1,3-diketone metal compounds in the present invention.

  The metal salt of the aliphatic carboxylic acid and the 1,3-diketone metal compound can be synthesized by a complex formation reaction in a solution. Or it is not limited to this, Other well-known methods are also employable.

  The amount of the metal compound used in the present invention is preferably 1% by mass to 90% by mass, more preferably 10% by mass to 75% by mass, and particularly preferably 20% by mass to 50% by mass with respect to the whole of the plurality of liquids. preferable. If the amount used is less than the above-mentioned amount, the effect of the present invention may not be exhibited effectively. If the amount is too large, the viscosity becomes high, which may cause a problem in the dischargeability of the ink liquid.

<High boiling point organic solvent (oil)>
The high boiling point organic solvent in the present invention means an organic solvent having a viscosity at 25 ° C. of 100 mPa · s or less or a viscosity at 60 ° C. of 30 mPa · s or less and a boiling point higher than 100 ° C.

  Here, the “viscosity” in the present invention refers to a viscosity obtained using a RE80 viscometer manufactured by Toki Sangyo Co., Ltd. The RE80 type viscometer is a conical rotor / plate type viscometer corresponding to the E type. Measurement is performed at a rotation speed of 10 rpm using the first rotor. However, for those having a viscosity higher than 60 mPa · s, measurement is performed by changing the number of revolutions to 5 rpm, 2.5 rpm, 1 rpm, 0.5 rpm, or the like as necessary.

  In the present invention, “water solubility” is the saturation concentration of water in a high-boiling organic solvent at 25 ° C., and means the mass (g) of water that can be dissolved in 100 g of the high-boiling organic solvent at 25 ° C. .

  As the usage-amount of the said high boiling point organic solvent, 5-2000 mass% is preferable in conversion of coating amount with respect to the coloring agent to be used, and 10-1000 mass% is more preferable.

  In the present invention, the high-boiling organic solvent is preferably a compound represented by the following formulas [S-1] to [S-9].

<Storage stabilizer>
In the present invention, a storage stabilizer can be added for the purpose of suppressing undesired polymerization during storage of plural kinds of liquids. The storage stabilizer is preferably used in the same liquid as the polymerizable compound, and it is preferable to use a storage stabilizer that is soluble in the liquid or other coexisting components.

  Examples of storage stabilizers include quaternary ammonium salts, hydroxyamines, cyclic amides, nitriles, substituted ureas, heterocyclic compounds, organic acids, hydroquinones, hydroquinone monoethers, organic phosphines, copper compounds, and the like. .

  The addition amount of the storage stabilizer is preferably adjusted as appropriate based on the activity of the polymerization initiator used, the polymerizability of the polymerizable compound, and the type of the storage stabilizer. However, the storage stability and the curability of the ink during liquid mixing are preferred. From the standpoint of balance, the amount is preferably 0.005 to 1% by mass in terms of solid content in the liquid, more preferably 0.01 to 0.5% by mass, and still more preferably 0.01 to 0.2% by mass. .

<Liquid applying means>
In the inkjet image recording method of the present invention, as means for applying the first liquid onto the recording medium, other means such as coating may be used in addition to the ejection by the inkjet nozzle.

  There is no restriction | limiting in particular as an apparatus used for the said application | coating, A well-known coating apparatus can be suitably selected according to the objective. Examples include air doctor coaters, blade coaters, lot coaters, knife coaters, squeeze coaters, impregnation coaters, reverse roll coaters, transfer roll coaters, gravure coaters, kiss roll coaters, cast coaters, spray coaters, curtain coaters, extrusion coaters, etc. It is done.

<Energy application process>
In the present invention, ultraviolet light, visible light, or the like can be used as an exposure light source for proceeding polymerization of the polymerizable compound. In addition, energy can be applied by radiation other than light, for example, α-ray, γ-ray, X-ray, electron beam, etc. Of these, ultraviolet rays and visible rays are used from the viewpoint of cost and safety. Preferably, ultraviolet rays are used. The amount of energy required for the curing reaction varies depending on the type and content of the polymerization initiator, but is generally about 1 to 500 mJ / cm ² .

  On the other hand, when an electron beam is used as the exposure light source, energy efficiency, the material of the recording medium and the conveying means (such as a belt), the degree of freedom in thickness, and the polymerization initiator are unnecessary. In addition, when ultraviolet rays are used, heat is generated from the UV light source, so that a recording medium that is weak against heat cannot be used. However, when an electron beam is used, a recording medium that is sensitive to heat can also be used.

  In particular, in the present invention, even for materials that are difficult to transmit ultraviolet rays (thick paper such as photographic paper, plastics that absorb ultraviolet rays such as polycarbonate and polyimide, and sheet-like metals), an electron beam is emitted from the back surface of the recording medium immediately after ejection. The liquid mixture on the recording medium can be cured. Further, since the transmittance of the electron beam depends on the density of the substance, it is highly applicable to a thick recording medium that does not transmit ultraviolet rays. Further, by using an electron beam, the selection range of the material of the endless belt as shown in FIG.

[Explanation of curing energy]
In the inkjet recording apparatus 10 shown in this example, a step of fixing an image to the recording medium 16 by applying energy after image formation is provided from the viewpoint of obtaining excellent fixability.

  In other words, by applying energy to the treatment liquid and each color ink that are ejected onto the recording medium 16, polymerization and curing reactions of these liquids are promoted, and a stronger image can be formed more efficiently. In this example, such energy application is performed by irradiation with radiation such as UV light.

  That is, the application of energy (UV light) by the UV light source 36 constituting the UV light irradiation unit 26 promotes the generation of active species due to the decomposition of the polymerization initiator in the liquid ejected onto the recording medium 16, and the activity. The increase in the species and the increase in temperature promote the polymerization and curing reaction of the polymerizable compound resulting from the active species.

  In this example, an ultraviolet light source is shown as an example of an exposure light source for advancing polymerization of a polymerizable compound, but in addition to this, visible light, α-ray, γ-ray, X-ray, electron beam, etc. are irradiated. Among these, it is preferable to use ultraviolet light and visible light from the viewpoint of cost and safety, and it is more preferable to use ultraviolet light. The amount of energy required for the curing reaction varies depending on the type and content of the polymerization initiator, but is generally about 1 to 500 mJ / cm2.

  An example of the UV light source 36 constituting the UV light irradiation unit 26 applied to the ink jet recording apparatus 10 shown in this example is a metal halide lamp, xenon lamp, high pressure mercury lamp, low pressure mercury lamp, carbon arc lamp, germicidal lamp, ultraviolet fluorescence. There are lamps and ultraviolet LEDs.

[Description of recording medium]
In the present invention, a recording medium that transmits UV light is used. In particular, a thin recording medium is suitable, and the effects of the present application can be further obtained. Examples of the recording medium include glass, polyester such as polyethylene terephthalate and polybutadiene terephthalate, polyolefin such as polystyrene, polyethylene, polyurethane and polypropylene, acrylic resin, acrylonitrile-butadiene-styrene copolymer, diacetate, triacetate and polyimide. Cellophane, celluloid, PET film, OPS film, OPP film, PNy film, PVC film, PE film, TAC film, ABS, polyacetal, PVA and the like. The recording medium may be thin paper or cloth.

[Other Embodiments]
5 and 6 are main part configuration diagrams of another embodiment of the ink jet recording apparatus 10.

  In the ink jet recording apparatus 10 shown in FIG. 5, the treatment liquid discharge head 14 is disposed on the most upstream side in the paper conveyance direction, and the ink discharge heads 12 (12K, 12C, 12M, 12Y) is arranged. In FIG. 1, a plurality of treatment liquid ejection heads 14 are provided corresponding to each of the plurality of ink ejection heads 12, whereas in FIG. 5, one treatment liquid ejection head is provided for each of the plurality of ink ejection heads 12. 14 is provided. In such a configuration, it is preferable that the UV light irradiation unit 26 is provided at a position facing the ink discharge head 12Y on the most downstream side in the paper conveyance direction. If UV light is irradiated on the upstream side in the paper transport direction, a polymerization reaction occurs due to the mixing of the treatment liquid and ink (for example, black (K), cyan (C), etc.) on the upstream side in the paper transport direction. This is because the processing liquid may be insufficient on the downstream side in the paper conveyance direction. Therefore, it is preferable to change the shape, arrangement, and the like of the reflector 34 so that UV light is not irradiated upstream in the paper conveyance direction. In the example shown in FIG. 5, one of the semicircular reflectors 34 is configured to extend straight in the circumferential direction. Further, a platen 28 similar to that shown in FIG. 1 is provided at a position facing the ink ejection head 12Y on the back side of the recording surface of the recording medium 16 so as to be sandwiched between the UV light irradiation unit 26 and the recording medium 16. The guide 30 is provided in this part.

  The ink jet recording apparatus 10 shown in FIG. 6 has a structure in which an endless belt 42 is wound around rollers 40 and 41. The arrangement of the treatment liquid discharge head 14 and each ink discharge head 12 (12K, 12C, 12M, 12Y) is the same as that shown in FIG. The UV light irradiation unit 26 is provided at a position facing the ink ejection head 12Y on the back side of the belt surface 42A that supports the recording medium 16. The belt 42 is made of a material such as transparent PET, and is configured to transmit the UV light emitted from the UV light irradiation unit 26.

  As described above, according to the ink jet recording apparatus according to each of the above-described embodiments, the two liquids using the treatment liquid containing the curing initiator, the diffusion preventing agent, and the oil, and each color ink containing the UV monomer and the coloring material. In this system, the treatment liquid is ejected onto the recording medium prior to the inks of the respective colors, thereby preventing image deterioration due to landing interference or bleeding. In addition, by irradiating UV light from the back side of the recording surface of a recording medium made of a material that transmits UV light, the treatment liquid and ink of each color are mixed in the recording medium almost simultaneously (that is, each color ink is placed on the recording medium). It can be hardened and fixed at almost the same time as it lands. Since the polymerization reaction does not occur before the treatment liquid and each color ink are mixed, ejection failure of the ejection head due to solidification of the treatment liquid and each color ink is prevented. As a result, an image with good image quality can be formed on the recording medium without the image being deteriorated.

  Although the image forming apparatus of the present invention has been described in detail above, the present invention is not limited to the above examples, and various improvements and modifications may be made without departing from the spirit of the present invention. Of course.

1 is an overall configuration diagram of an ink jet recording apparatus according to the present invention. It is a top view showing the discharge surface of the discharge head. It is side surface sectional drawing showing a part of discharge head. It is a principal block diagram showing the system configuration of the ink jet recording apparatus. It is a principal part block diagram showing other embodiment of the inkjet recording device. It is a principal part block diagram showing other embodiment of the inkjet recording device.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Inkjet recording device, 12 ... Ink discharge head, 14 ... Processing liquid discharge head, 16 ... Recording medium, 18 ... Liquid storage / loading part, 26 ... UV light irradiation part, 28 ... Platen, 50 ... Discharge head, 51 ... Nozzle, 52 ... pressure chamber, 53 ... supply port, 55 ... common flow path, 56 ... diaphragm, 58 ... piezoelectric element, 58a ... piezoelectric body, 58b ... individual electrode, 80 ... print control unit, 84 ... head driver for ink 85 ... Treatment liquid head driver, 92 ... Light source driver

Claims (4)

Either one of the first liquid and the second liquid containing the coloring material contains a radiation curable polymerizable compound, and the other contains a curing initiator,
First liquid ejecting means for ejecting the first liquid onto a recording surface of a recording medium;
Second liquid ejecting means for ejecting the second liquid to an area where the first liquid is ejected on the recording surface of the recording medium;
The recording is arranged with respect to the mixed liquid in which the first liquid and the second liquid are mixed on the recording surface of the recording medium, which is disposed at a position facing the second liquid ejecting unit with the recording medium interposed therebetween. Radiation irradiating means for irradiating radiation from the back side of the recording surface of the medium,
The image forming apparatus, wherein the recording medium is a medium that transmits the radiation.   The image forming apparatus according to claim 1, wherein the first liquid contains a diffusion inhibitor.   2. The line head according to claim 1, wherein at least one of the first liquid discharge unit and the second liquid discharge unit is a line head in which a number of nozzles are arranged over a length corresponding to a paper width of the recording medium. The image forming apparatus according to claim 2.   The recording medium is supported between the recording medium and the radiation irradiating means so that the portion that transmits the radiation and faces the second liquid ejecting means of the recording medium is substantially planar. The image forming apparatus according to claim 1, further comprising a support member.

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