WO2018181992A1 - Procédé de formation d'image - Google Patents

Procédé de formation d'image Download PDF

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Publication number
WO2018181992A1
WO2018181992A1 PCT/JP2018/013904 JP2018013904W WO2018181992A1 WO 2018181992 A1 WO2018181992 A1 WO 2018181992A1 JP 2018013904 W JP2018013904 W JP 2018013904W WO 2018181992 A1 WO2018181992 A1 WO 2018181992A1
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Prior art keywords
group
water
mass
resin particles
acid
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PCT/JP2018/013904
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English (en)
Japanese (ja)
Inventor
大我 溝江
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富士フイルム株式会社
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Publication of WO2018181992A1 publication Critical patent/WO2018181992A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
    • B41M5/52—Macromolecular coatings
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D11/00—Inks
    • C09D11/30—Inkjet printing inks
    • C09D11/32—Inkjet printing inks characterised by colouring agents

Definitions

  • the present disclosure relates to an image forming method.
  • Recording methods using the inkjet method are widely used because high-quality images can be recorded on a wide variety of substrates by ejecting ink droplets from a number of nozzles provided in an inkjet head. ing.
  • an image forming method may be used in which an image containing a colorant is contacted with a treatment liquid containing a compound that aggregates components in the ink to form an image.
  • a treatment liquid containing a compound that aggregates components in the ink to form an image.
  • Such ink and treatment liquid are used as an ink set.
  • JP-A-2015-020340 discloses a set of an ink containing a color material and water and a liquid composition, and the liquid composition causes smectite and the color material in the ink to precipitate or aggregate.
  • a set containing a reactive agent and an image recording method are disclosed, and it is said that curling and cockling can be suppressed.
  • International Publication No. 2016/136914 discloses an ink composition containing a colorant and water, a water-insoluble resin particle having a specific content of a carboxy group or a salt of a carboxy group, and a colorant in the ink composition.
  • An ink set having a treatment liquid containing water and a compound that aggregates water and an image forming method are disclosed.
  • Japanese Unexamined Patent Application Publication No. 2016-013688 discloses a liquid composition applying step for applying a liquid composition to an intermediate transfer member, and an intermediate image for forming an intermediate image by applying ink to the intermediate transfer member to which the liquid composition has been applied.
  • an image recording method having a forming step and a transfer step of transferring an intermediate image to a recording medium
  • the ink contains a color material and first resin particles
  • the liquid composition contains a reactive agent
  • An image recording method comprising: a second resin particle satisfying a predetermined storage elastic modulus relationship, wherein the application amount of the second resin particle to the intermediate transfer member in the intermediate image forming step is a predetermined range. It is disclosed. According to this image recording method, it is said that a high-quality image can be obtained with high transfer efficiency.
  • an image is formed on a recording medium having a rough surface (for example, a recording medium having a surface roughness Ra of 2.6 ⁇ m or more) by bringing an ink containing a colorant into contact with a treatment liquid containing a compound that aggregates the components in the ink.
  • a treatment liquid containing a compound that aggregates the components in the ink When trying to form the recording medium, the surface of the recording medium is rough. Therefore, when the treatment liquid or the liquid composition is applied thereon, the surface of the application surface tends to become rough.
  • a problem to be solved by one embodiment of the present invention is to suppress the occurrence of image roughness using an ink composition containing a colorant and a pretreatment liquid containing a compound that aggregates the colorant in the ink composition. And providing an image forming method excellent in processing solution stability.
  • the content Z with respect to the total mass of the pretreatment liquid and the compound for aggregating the colorant in the ink composition are as follows: A step of applying a pretreatment liquid containing water-insoluble resin particles satisfying formula (3) to form a treatment liquid application surface having an arithmetic average roughness Ra 2 satisfying the following formula (2); And a step of applying an ink composition containing a colorant and water to the treatment liquid application surface by an inkjet method.
  • ⁇ 4> The above-mentioned ⁇ 1> to ⁇ 3>, wherein the pretreatment liquid contains a water-soluble organic solvent, and the content of the water-soluble organic solvent is 15% by mass or less with respect to the total mass of the pretreatment liquid
  • ⁇ 5> The image forming method according to ⁇ 4>, wherein the solubility parameter value of the water-soluble organic solvent is 22 MPa 1/2 or more.
  • the recording medium is a paper substrate having a support and a coating layer, and the arithmetic average roughness Ra 1 of the surface having the coating layer satisfies the formula (1) ⁇ 1> to ⁇ 1. 5.
  • ⁇ 7> The method according to any one of ⁇ 1> to ⁇ 6>, further including a step of applying a post-treatment liquid to the surface to which the ink composition is applied after the step of applying the ink composition by an inkjet method.
  • Image forming method
  • an ink composition containing a colorant and the colorant in the ink composition are aggregated on a recording medium having a rough surface (a surface having an arithmetic average roughness Ra of 2.6 ⁇ m or more).
  • a pretreatment liquid containing a compound By using a pretreatment liquid containing a compound, there is provided an image forming method that suppresses the occurrence of image roughness and is excellent in stability of the treatment liquid.
  • a numerical range indicated by using “to” indicates a range including the numerical values described before and after “to” as the minimum value and the maximum value, respectively.
  • the upper limit value or the lower limit value described in a numerical range may be replaced with the upper limit value or the lower limit value of another numerical range described.
  • the upper limit value or the lower limit value described in a certain numerical range may be replaced with the values shown in the examples.
  • the amount of each component in the composition is the sum of the plurality of substances present in the composition unless there is a specific indication when there are a plurality of substances corresponding to each component in the composition.
  • “(meth) acryl” represents both and / or one of acryl and methacryl
  • “(meth) acrylate” represents both and / or one of acrylate and methacrylate.
  • R represents an alkyl group, an aryl group or a heterocyclic group
  • R is an unsubstituted alkyl group, a substituted alkyl group, an unsubstituted aryl group, a substituted aryl group, an unsubstituted group” Represents a heterocyclic group or a substituted heterocyclic group.
  • process is not only an independent process, but is included in this term if the intended purpose of the process is achieved even when it cannot be clearly distinguished from other processes.
  • arithmetic average roughness Ra 1 and “arithmetic average roughness Ra 2 ” may be referred to as “surface roughness Ra 1 ” and “surface roughness Ra 2 ”, respectively.
  • a compound that aggregates a colorant in an ink composition on a recording medium having a surface whose arithmetic average roughness Ra 1 satisfies the following formula (1): And a water-insoluble resin particle whose content Z with respect to the total mass of the pretreatment liquid satisfies the following formula (3) and water (hereinafter, also simply referred to as “pretreatment liquid”). And a process liquid forming surface having an arithmetic average roughness Ra 2 satisfying the following formula (2) (hereinafter also referred to as “pretreatment process”), and a process liquid application surface of the recording medium.
  • an image forming method in which the occurrence of image roughness is suppressed and the processing solution is excellent in stability is provided using an ink composition containing a colorant and a pretreatment liquid containing an aggregating compound.
  • the image forming method of the present disclosure is capable of forming an image on which a rough surface (arithmetic average roughness Ra of 2.6 ⁇ m or more) is recorded on a recording medium with reduced occurrence of image roughness and processing. Excellent liquid stability.
  • the image forming method of the present disclosure may have other steps other than the pretreatment step and the image forming step, and examples of other steps include a surface to which an ink composition is applied in the image forming step.
  • a step of applying a post-treatment liquid containing water-insoluble resin particles hereinafter also referred to as “post-treatment step”
  • post-treatment step a post-treatment liquid containing water-insoluble resin particles
  • image roughness means that when the pretreatment liquid is applied on the surface of the recording medium in the pretreatment process prior to the image forming process, It means a phenomenon in which an aggregating compound is unevenly distributed in an applied region, and an unintended shading is generated in the density of an image formed by ink application.
  • treatment liquid stability means that even when the pretreatment liquid used in the pretreatment process is aged, the expansion of components (particularly water-insoluble resin particles) contained in the pretreatment liquid is suppressed, and the viscosity is maintained. It means being done.
  • the surface roughness Ra 1 of the recording medium on which an image is formed in the preprocessing step, the surface roughness Ra 2 of the processing liquid application surface formed by the preprocessing liquid, and
  • the content Z of the water-insoluble resin particles in the pretreatment liquid satisfies the above formulas (1), (2), and (3), the uneven distribution of the cohesive compound on the treatment liquid application surface is effective. Therefore, an excellent effect of suppressing the occurrence of image roughness can be obtained.
  • the pretreatment liquid contains water-insoluble resin particles and an aggregating compound having a content satisfying the formula (3): 10% by mass ⁇ the content Z ⁇ 20% by mass
  • the surface roughness Ra 2 of the treatment liquid application surface on the rough surface recording medium satisfying the formula (1): 2.6 ⁇ m ⁇ Ra 1 is expressed by the formula (2): Ra 2 ⁇ 2.
  • the content of the water-insoluble resin particles contained in the pretreatment liquid is large, the effect of suppressing the uneven distribution of the cohesive compound is easily obtained.
  • a pretreatment liquid containing a large amount of water-insoluble resin particles tends to easily aggregate in the liquid over time. In such a case, stable image formation may be hindered.
  • the content Z of the water-insoluble resin particles in the pretreatment liquid satisfies the specific range represented by the formula (3): 10% by mass ⁇ the content Z ⁇ 20% by mass.
  • the pretreatment step includes a compound that aggregates the colorant in the ink composition (that is, an aggregating compound) on a recording medium having a surface with an arithmetic average roughness Ra 1 satisfying the following formula (1), and a pretreatment liquid.
  • a pretreatment liquid containing a water-insoluble resin particle satisfying the following formula (3) with a content Z relative to the total mass of the pretreatment liquid application surface satisfying the following formula (2): arithmetic average roughness Ra 2 Is a step of forming Formula (1): 2.6 ⁇ m ⁇ Ra 1 Formula (2): Ra 2 ⁇ 2.6 ⁇ m Formula (3): 10% by mass ⁇ content Z ⁇ 20% by mass
  • the pretreatment process is performed before the image forming process using the ink composition. That is, before the ink composition is applied on the recording medium, a pretreatment liquid for aggregating components (colorants and the like) in the ink composition is applied in advance, and before the ink composition is applied on the recording medium. An ink composition is applied so as to come into contact with the treatment liquid to form an image. Thereby, inkjet recording can be speeded up, and an image with high density and resolution can be obtained even at high speed recording.
  • a pretreatment liquid containing an aggregating compound and a predetermined amount of water-insoluble resin particles is used as the pretreatment liquid.
  • the surface roughness Ra 1 and Ra 2 are both arithmetic average roughness.
  • the arithmetic average roughness in this specification is a value measured using a surface roughness measuring device (manufactured by Keyence Corporation, shape analysis laser microscope, product name: VK-9700). Specific measurement methods and measurement conditions are as follows.
  • the surface roughness Ra 1 is measured by using the surface roughness measuring apparatus (shape analysis laser microscope) as the object of measurement on the surface of the recording medium before applying the pretreatment liquid. This is done by photographing under the following measurement conditions.
  • the surface roughness Ra 2 is measured by using the surface roughness measuring apparatus (shape analysis laser microscope) as a measurement target after applying the pretreatment liquid and applying the treatment liquid surface on which image formation is possible.
  • the measurement conditions are as follows. ⁇ Measurement conditions ⁇ Lens magnification: 10 times Filter: None Z measurement pitch: 1 ⁇ m Measurement mode: Surface shape Measurement area: Surface
  • Expression (1) defines that the surface roughness Ra 1 of the surface of the recording medium on which an image is formed is 2.6 ⁇ m or more. That the surface roughness Ra 1 of the recording medium is 2.6 ⁇ m or more is an indicator that the recording medium has a rough surface property. For such a recording medium, it has been difficult to suppress the occurrence of image roughness by the conventional image forming method. However, in the image forming method of the present disclosure, a surface with Ra 1 of 2.6 ⁇ m or more is used. By using the recording medium, it is possible to form a favorable image in which the occurrence of image roughness is suppressed.
  • the recording medium used in the image forming method of the present disclosure only needs to have the surface roughness Ra 1 of the surface on which an image is formed satisfy the formula (1), that is, the surface roughness Ra 1 is 2.6 ⁇ m or more.
  • the surface satisfying the formula (1) with the surface roughness Ra may be only one side or both sides.
  • the upper limit of Ra 1 in formula (1) is not particularly limited, but is practically preferably 10 ⁇ m or less, and more preferably 7 ⁇ m or less.
  • Formula (2) specifies that the surface roughness Ra 2 of the treatment liquid application surface formed by applying the pretreatment liquid is 2.6 ⁇ m or less.
  • Formula (3) prescribes
  • a treatment liquid application surface having a surface roughness Ra 2 of 2.6 ⁇ m or less is formed. Due to the presence of irregularities on the surface of the recording medium, uneven distribution of the cohesive compound is effectively suppressed in the region to which the pretreatment liquid has been applied. Thereby, when ink is applied to the treatment liquid application surface in an image forming process described later, the occurrence of image roughness is effectively suppressed.
  • the content Z of the water-insoluble resin particles in the pretreatment liquid is in the range of 10% by mass or more and 20% by mass or less, even when the pretreatment liquid is aged, the components of the water-insoluble resin particles are aggregated. Is suppressed, and the stability of the processing solution is also excellent.
  • Ra 2 in the formula (2) is 2.6 ⁇ m or less.
  • the lower limit of Ra 2 is not particularly limited, but is about 1.5 ⁇ m.
  • the surface roughness Ra 2 may be set to 2.4 ⁇ m or less or 2.2 ⁇ m or less in an embodiment of the present disclosure from the viewpoint of suppressing the occurrence of image roughness.
  • the surface roughness Ra 2 of the treatment liquid application surface is the surface after the pretreatment liquid is applied and dried on the surface of the recording medium, and the ink composition can be applied by the image forming process. It is roughness.
  • the content Z of the water-insoluble resin particles with respect to the total mass of the pretreatment liquid is set in the range of the formula (3). And so on.
  • the content Z in the formula (3) is 10% by mass or more and 20% by mass or less, and is preferably 12% by mass or more and 20% by mass or less from the viewpoint of suppressing the occurrence of image roughness and processing solution stability. It is more preferable that the content be 20% by mass or more.
  • the pretreatment liquid can be applied by applying a known method such as a coating method, an ink jet method, or an immersion method.
  • a coating method such as a coating method, an ink jet method, or an immersion method.
  • the coating method include known coating methods using a bar coater, an extrusion die coater, an air doctor coater, a blade coater, a rod coater, a knife coater, a squeeze coater, a reverse roll coater, a bar coater, and the like. Details of the inkjet method will be described later.
  • the amount of the pretreatment liquid applied may be set in consideration of the composition of the pretreatment liquid, the composition of the ink composition, and the like.
  • Heating and drying can be performed by a known heating means such as a heater, an air blowing means such as a dryer, or a combination of these.
  • Examples of the heating method include a method of applying heat with a heater or the like from the side opposite to the treatment liquid application surface of the recording medium, a method of applying warm air or hot air to the treatment liquid application surface of the recording medium, and a method of using an infrared heater. These heating methods may be combined.
  • the image forming step is a step of discharging the ink composition to the surface of the recording medium to which the pretreatment liquid has been applied by an ink jet method. Through this step, an ink image is formed from the ink composition.
  • the inkjet method is not particularly limited, and is a known method, for example, a charge control method that discharges ink using electrostatic attraction, a drop-on-demand method (pressure pulse method) that uses vibration pressure of a piezoelectric element, an electric method
  • An acoustic ink jet system that converts a signal into an acoustic beam, irradiates the ink with ink and ejects the ink using radiation pressure, and a thermal ink jet (bubble jet (registered trademark)) that heats the ink to form bubbles and uses the generated pressure. ))
  • Any of the methods may be used.
  • an ink jet method in particular, the method described in Japanese Patent Laid-Open No.
  • Sho 54-59936 causes a sudden change in volume of the ink subjected to the action of thermal energy, and the ink is ejected from the nozzle by the action force caused by this state change.
  • Ink jet method can be used effectively.
  • the inkjet method includes a method of ejecting a large number of low-density inks called photo inks in a small volume, a method of improving image quality using a plurality of inks having substantially the same hue and different concentrations, and colorless and transparent inks. The method used is included.
  • an ink jet head used in the ink jet method may be an on-demand method or a continuous method.
  • Discharge methods include electro-mechanical conversion methods (eg, single cavity type, double cavity type, bender type, piston type, shear mode type, shared wall type), and electro-thermal conversion methods (eg, thermal ink jet).
  • Specific examples include a mold, a bubble jet (registered trademark) type, an electrostatic suction method (for example, an electric field control type, a slit jet type), and a discharge method (for example, a spark jet type).
  • the discharge method may be used. There are no particular restrictions on the ink nozzles used when recording by the ink jet method, and they can be appropriately selected according to the purpose.
  • an inkjet head As an inkjet head, a single serial head is used, a shuttle system that performs recording while scanning the head in the width direction of the recording medium, and a line head in which recording elements are arranged corresponding to the entire area of one side of the recording medium There is a line system using.
  • the line system an image can be recorded on the entire surface of the recording medium by scanning the recording medium in a direction orthogonal to the arrangement direction of the recording elements, and a carriage system such as a carriage for scanning a short head is not necessary. Further, since complicated scanning control of the carriage movement and the recording medium is not required, and only the recording medium is moved, the recording speed can be increased as compared with the shuttle system. Any of these types of inkjet heads can be applied to the image forming method of the present disclosure. However, in general, when a line method that does not use a dummy jet is applied, there is an effect of improving ejection accuracy and image abrasion resistance. large.
  • the image forming step is preferably started within 10 seconds after the pretreatment step, and more preferably within 0.1 seconds to 10 seconds. Thereby, an image can be formed at high speed.
  • the image forming method uses an ink set comprising the ink composition according to the present disclosure and a pretreatment liquid, so that even when an image is recorded at a high speed, landing interference is suppressed and a high-definition image is formed. can do.
  • “Start within 10 seconds after the pretreatment step” means that the time from the application of the pretreatment liquid and the completion of drying until the first ink droplets are deposited on the recording medium is within 10 seconds. To do.
  • the amount of ink droplets to be applied is preferably 1.5 pL (picoliter) to 3.0 pL, more preferably 1.5 pL to 2 More preferably, it is 5 pL.
  • the amount of ink droplets can be adjusted by appropriately selecting the ejection conditions in the ink jet method according to the ink composition to be ejected.
  • the image forming method of the present disclosure preferably further includes a heat fixing step of heat fixing the image formed through the treatment liquid applying step and the image forming step.
  • a heat fixing step of heat fixing the image formed through the treatment liquid applying step and the image forming step By heat fixing in the heat fixing step, the image on the recording medium is fixed, and the abrasion resistance of the image is further improved.
  • the heating in the heat fixing step is preferably performed at a temperature equal to or higher than the minimum film-forming temperature (MFT) of the resin particles in the image.
  • MFT minimum film-forming temperature
  • the pressure during pressurization is preferably in the range of 0.1 MPa to 3.0 MPa, more preferably in the range of 0.1 MPa to 1.0 MPa, and more preferably in the range of 0.1 MPa to 0 in terms of surface smoothing.
  • the range of 0.5 MPa is more preferable.
  • the method of heating is not particularly limited, but the method of drying in a non-contact manner, such as a method of heating with a heating element such as a nichrome wire heater, a method of supplying warm air or hot air, and a method of heating with a halogen lamp, an infrared lamp, etc. Can be preferably mentioned.
  • the method of heating and pressing is not particularly limited.
  • a method of pressing a hot plate against the image forming surface of a recording medium, a pair of heating and pressing rollers, a pair of heating and pressing belts, or a recording medium Using a heating and pressing device equipped with a heating and pressing belt arranged on the image forming surface side and a holding roller arranged on the opposite side, a method of passing a pair of rollers etc. is used for contact and heating fixing.
  • the method of performing is mentioned suitably.
  • a preferable nip time is 1 to 10 seconds, more preferably 2 to 1 second, and further preferably 4 to 100 milliseconds.
  • the preferable nip width is 0.1 mm to 100 mm, more preferably 0.5 mm to 50 mm, and still more preferably 1 mm to 10 mm.
  • the heat and pressure roller may be a metal metal roller, or a roller provided with a coating layer having an elastic body around a metal cored bar and, if necessary, a surface layer (also referred to as a release layer).
  • the latter core metal can be formed of, for example, a cylindrical body made of iron, aluminum, or stainless steel (SUS), and the core metal surface is preferably at least partially covered with a coating layer.
  • the covering layer is particularly preferably formed of a silicone resin or fluororesin having releasability.
  • a heating element is built in one of the cores of the heat and pressure roller. By passing a recording medium between the rollers, heat treatment and pressure treatment can be performed simultaneously or as necessary. Accordingly, the recording medium may be sandwiched and heated using two heating rollers.
  • the heating element for example, a halogen lamp heater, a ceramic heater, and a nichrome wire heater are preferable.
  • the belt base material for forming the heat and pressure belt used in the heat and pressure apparatus is preferably a seamless nickel brass, and the thickness of the belt base material is preferably 10 ⁇ m to 100 ⁇ m. Further, as the material of the belt base material, aluminum, iron, polyethylene and the like can be used in addition to nickel. When a silicone resin or a fluororesin is provided, the thickness of the layer formed using these resins is preferably 1 ⁇ m to 50 ⁇ m, more preferably 10 ⁇ m to 30 ⁇ m.
  • nip pressure for example, elastic members such as springs having tension are provided at both ends of a roller such as a heating and pressure roller so that a desired nip pressure can be obtained in consideration of the nip gap. Select and install.
  • the conveyance speed of the recording medium is preferably 200 mm / second to 700 mm / second, more preferably 300 mm / second to 650 mm / second, and 400 mm / second to 600 mm / second. Further preferred.
  • a post-treatment liquid containing water-insoluble resin particles is applied to the surface to which the ink composition is applied (hereinafter also referred to as “image forming surface”). It is preferable to have a process (post-processing process). It is preferable to perform the post-processing step because finished texture such as glossiness and matte feeling can be expressed.
  • the post-processing step may be a step of forming a protective layer on the image forming surface.
  • the post-processing step is preferably performed after the image forming step and the heat fixing step.
  • the post-treatment liquid As a method for applying the post-treatment liquid, it can be performed by a known method such as a coating method, an ink jet method, an immersion method, or the like, and it is preferable to apply by a coating method. As a coating method, it can carry out by the well-known coating method mentioned at the above-mentioned pretreatment process. Details of the post-treatment liquid will be described later.
  • the post-processing apparatus applies the post-processing liquid to the application surface (that is, the image forming surface) of the ink composition of the recording medium after the image forming process (or after the heat fixing process if it has a heat fixing process).
  • the post-processing liquid processing section for performing a process such as drying on the post-processing liquid applied to the image forming surface by the post-processing liquid application section, and whether to apply the post-processing liquid.
  • the post-processing liquid application control unit for controlling the post-processing liquid application unit based on the acquired information, and information on whether or not to apply the post-processing liquid are acquired, and the post-processing liquid is acquired based on the acquired information.
  • a post-treatment liquid treatment control unit that controls the treatment unit.
  • the post-processing apparatus the inkjet printing apparatus and the post-processing apparatus are connected, and the post-processing process is continuously performed after the image forming process.
  • the post-treatment liquid process is selectively performed.
  • the post-processing process is not performed, the recording medium after image formation discharged from the ink jet printing apparatus is passed through the post-processing apparatus.
  • the post-processing apparatus may be configured in the same manner as the varnish coating apparatus described in Japanese Patent Application Laid-Open No. 2016-107419, for example.
  • the application amount of the post-treatment liquid from the viewpoint of excellent gloss, the range of 2.0g / m 2 ⁇ 6.0g / m 2 is preferably in the range of 3.0g / m 2 ⁇ 5.0g / m 2 More preferred.
  • Recording medium is a target of image formation by the image forming method of the present disclosure
  • the surface roughness Ra 1 is the formula (1): has a surface that satisfies 2.6 [mu] m ⁇ Ra 1.
  • the matters concerning the surface roughness Ra 1 in the recording medium are as described above.
  • Examples of the recording medium include paper base materials such as coated paper, synthetic paper, and polymer base materials such as polyethylene terephthalate (PET) film.
  • a paper base is preferable, and a paper base (coated paper) having a support and a coating layer is more preferable in that the effect of suppressing the occurrence of image roughness appears remarkably.
  • coated paper is a paper substrate in which a coating layer containing an inorganic pigment or the like is provided on the surface of high-quality paper, medium-quality paper, or the like, which is generally not surface-treated, mainly composed of cellulose as a support.
  • the coated paper tends to cause uneven gloss in the image area, but when the treatment liquid contains phosphoric acid or a phosphoric acid compound, the occurrence of uneven gloss in the image area can be effectively suppressed.
  • art paper, coated paper, lightweight coated paper, or finely coated paper is preferable as the paper substrate.
  • the inorganic pigment contained in the coating layer is not particularly limited, but silica, kaolin, clay, calcined clay, zinc oxide, tin oxide, magnesium sulfate, aluminum oxide, aluminum hydroxide, pseudoboehmite, calcium carbonate, satin white , Aluminum silicate, smectite, zeolite, magnesium silicate, magnesium carbonate, magnesium oxide, and diatomaceous earth are preferable, and at least one selected from calcium carbonate, silica, and kaolin is more preferable.
  • a commercially available product may be used as the recording medium of the present disclosure.
  • Examples of commercially available products "NewDV” Kishu Paper Co., Ltd. of Hokuetsu (Ra 1: 2.83 ⁇ m), BUCHMANN KARTON manufactured by “Kondor” (Ra 1: 3.032 ⁇ m), Oji Paper Co., Ltd. “OKT mat” (Ra 1 : 3.01 ⁇ m), “UF Coat” (Ra 1 : 2.8112 ⁇ m) manufactured by Oji Materia Co., Ltd., and the like.
  • the pretreatment liquid contains water-insoluble resin particles, a compound that aggregates the colorant in the ink composition (aggregating compound), and water.
  • the pretreatment liquid may contain components other than water-insoluble resin particles, a cohesive compound, and water as necessary.
  • the pretreatment liquid contains at least one kind of water-insoluble resin particles.
  • the content Z of the water-insoluble resin particles in the pretreatment liquid satisfies the formula (3): 10% by mass ⁇ Z ⁇ 20% by mass. Matters concerning the expression (3) are as described above.
  • Water-insoluble of water-insoluble resin particles means volume average particle diameter measurement at a liquid temperature of 25 ° C. using an aqueous dispersion of resin particles adjusted so that the solid content concentration is 1% by mass to 2% by mass. This is the case where particles can be detected and the volume average particle diameter can be measured. In addition, when particles are not detected and the volume average particle diameter cannot be measured, the resin is dissolved in water, and this state is generally referred to as “water-soluble”.
  • the volume average particle diameter of the water-insoluble resin particles is preferably 10 nm or more and 500 nm or less, and more preferably 50 nm or more and 500 nm or less, from the viewpoint of improving the occurrence of image roughness and improving the stability of the processing solution.
  • the volume average particle diameter of the water-insoluble resin particles may be 150 nm or more and 500 nm or less from the viewpoint of suppressing the occurrence of image roughness and the stability of the processing liquid.
  • the volume average particle diameter of the water-insoluble resin particles can be determined by measurement using a dynamic light scattering method.
  • Nanotrac particle size distribution measuring device UPA-EX150 manufactured by Nikkiso Co., Ltd.
  • the volume average particle diameter is measured using an aqueous dispersion adjusted to a solid content concentration of 1% by mass to 2% by mass at a liquid temperature of 25 ° C.
  • the weight average molecular weight of the water-insoluble resin particles is preferably 1,000 to 1,000,000, more preferably 5,000 to 500,000, still more preferably 5,000 to 300,000, and the redispersibility point. In particular, 5,000 to 50,000 is particularly preferable.
  • the weight average molecular weight can be measured by gel permeation chromatography (GPC).
  • GPC gel permeation chromatography
  • HLC-8220GPC manufactured by Tosoh Corporation
  • TSKgel Super Multipore HZ-H (manufactured by Tosoh Corporation, 4.6 mm ID ⁇ 15 cm) were used as columns
  • THF tetrahydrofuran
  • the conditions are as follows: the sample concentration is 0.45 mass%, the flow rate is 0.35 ml / min, the sample injection amount is 10 ⁇ l, the measurement temperature is 40 ° C., and the suggested refractive index (RI) detector is used.
  • RI refractive index
  • the calibration curve is “Standard sample TSK standard, polystyrene” manufactured by Tosoh Corporation: “F-40”, “F-20”, “F-4”, “F-1”, “A-5000” It is prepared from 8 samples of “A-2500”, “A-1000” and “n-propylbenzene”.
  • the glass transition temperature (Tg) of the water-insoluble resin particles is preferably 100 ° C. or higher and 250 ° C. or lower from the viewpoint of maintaining good thermal stability of the pretreatment liquid.
  • the Tg of the water-insoluble resin particles was measured with a differential scanning calorimeter (DSC) EXSTAR 6220 manufactured by SII Nano Technology.
  • the water-insoluble resin particles are preferably anionic resin particles.
  • the anionic resin particles that are water-insoluble resin particles are preferably resin particles formed from a polymer having an anionic group or a salt of an anionic group.
  • the anionic group or anionic group salt include a carboxy group or a carboxy group salt, a sulfo group or a sulfo group salt, Examples thereof include salts of phosphoric acid groups or phosphoric acid groups, phosphonic acid groups, or salts of phosphonic acid groups.
  • the pretreatment liquid contains anionic resin particles (preferably anionic resin particles having a carboxy group or a salt of a carboxy group), most of the water-insoluble resin particles in the recording medium after the pretreatment liquid is applied. Are unevenly distributed on the surface to improve the wettability of the surface of the recording medium. For this reason, when the ink composition described later is deposited on this surface, the droplet spreads on the surface of the recording medium, while the aggregating compound contained in the pretreatment liquid aggregates the colorant in the ink composition. It is possible to prevent coalescence between the droplets and to set the size of the droplets to a desired size.
  • anionic resin particles preferably anionic resin particles having a carboxy group or a salt of a carboxy group
  • Preferable examples of the water-insoluble resin particles include resin particles having a carboxy group or a carboxy group salt.
  • the recording medium is a paper substrate having a coating layer
  • water-insoluble resin particles having a carboxy group or a carboxy group salt is a component of the coating layer of the paper substrate (
  • the water-insoluble resin particles are likely to be unevenly distributed on the surface of the recording medium. Therefore, the wettability of the recording medium surface can be further improved.
  • Examples of the salt of the carboxy group in the water-insoluble resin particle include a structure in which a hydrogen atom in the carboxy group is substituted with a cation.
  • Examples of the cation include alkali metal ions such as sodium ion, potassium ion and lithium ion, alkaline earth metal ions such as calcium ion and magnesium ion, and ions such as ammonium ion, but are not particularly limited thereto. It is more preferable that the water-insoluble resin particles have a carboxy group or a carboxy group salt and a sulfo group or a sulfo group salt.
  • the water-insoluble resin particles having a carboxy group or a salt of a carboxy group are preferably water-insoluble resin particles formed of a polymer obtained by polymerizing a monomer having a carboxyl group or a salt of a carboxy group. That is, the water-insoluble resin particles preferably include a structural unit derived from a monomer having a carboxy group or a carboxy group salt as the structural unit.
  • the structural unit derived from a monomer having a carboxy group or a salt of a carboxy group includes at least one selected from a structural unit represented by the following general formula 1 and a structural unit represented by the following general formula 2. Is preferred.
  • R 1 represents a methyl group or a hydrogen atom.
  • L 1 is preferably at least one group selected from the following group a.
  • M represents a hydrogen atom or a cation. Examples of the cation include alkali metal ions such as sodium ion, potassium ion and lithium ion, alkaline earth metal ions such as calcium ion and magnesium ion, and ions such as ammonium ion.
  • R 2 and R 3 each independently represents a hydrogen atom or a methyl group
  • m represents an integer of 1 to 5
  • * represents a bonding position
  • L 2 and L 3 each independently represent a single bond or a methylene group.
  • M represents a hydrogen atom or a cation.
  • the cation include alkali metal ions such as sodium ion, potassium ion and lithium ion, alkaline earth metal ions such as calcium ion and magnesium ion, and ions such as ammonium ion.
  • Examples of the counter ion of the salt include alkali metal ions such as sodium ion, potassium ion and lithium ion, alkaline earth metal ions such as calcium ion and magnesium ion, and ions such as ammonium ion.
  • carboxylic anhydride such as maleic anhydride
  • hydrolysis is continued. You may introduce
  • an unsaturated polyvalent trivalent or higher A structural unit derived from a monomer having a carboxy group can be used.
  • constituent units derived from monomers having these carboxy groups or carboxy group salts those having a large acid value are likely to exhibit the effect of improving the wettability of the surface of the recording medium.
  • Constituent units derived from monomers having small acrylic acid, methacrylic acid, ⁇ -carboxyethyl acrylate, maleic acid, itaconic acid and salts thereof are preferred.
  • As the counter ion of the salt sodium ion, potassium ion, lithium ion and ammonium ion are preferable.
  • acrylic acid, methacrylic acid, sodium methacrylate, and ⁇ -carboxyethyl acrylate are more preferable in terms of polymerizability.
  • the water-insoluble resin particles preferably further contain a sulfo group or a sulfo group salt in addition to the carboxy group or the carboxy group salt.
  • a sulfo group or a salt of a sulfo group when an acidic compound is used as the aggregating compound described later, the dispersion stability of the water-insoluble resin particles in the pretreatment liquid is further improved.
  • the water-insoluble resin particles have a sulfo group or a sulfo group salt in the structure, the water-insoluble resin particles are preferably formed from a polymer obtained by polymerizing a monomer having a sulfo group or a sulfo group salt.
  • the water-insoluble resin particles preferably include a structural unit derived from a monomer having a sulfo group or a salt of a sulfo group as a structural unit.
  • a structural unit derived from a monomer having a sulfo group or a salt of a sulfo group a structural unit represented by the following general formula 3 is preferably included.
  • R 4 represents a methyl group or a hydrogen atom.
  • L 4 represents a single bond or a linear, branched or cyclic alkylene group having 1 to 10 carbon atoms, an arylene group having 6 to 10 carbon atoms, —O—, —NH—, —S—, —C ( ⁇ O) —, —CH (—OH) —, or a divalent linking group formed by linking two or more of these.
  • L 4 is preferably at least one group selected from the following group b.
  • M represents a hydrogen atom or a cation. Examples of the cation include alkali metal ions such as sodium ion, potassium ion and lithium ion, alkaline earth metal ions such as calcium ion and magnesium ion, and ions such as ammonium ion.
  • n represents an integer from 1 to 5
  • * represents a bonding position
  • Examples of the structural unit represented by the above general formula 3 include 2-acrylamido-2-methylpropanesulfonic acid, acrylamide-2-propanesulfonic acid, vinylsulfonic acid, styrenesulfonic acid, ⁇ -methylstyrenesulfonic acid, 2-sulfoethyl (meth) acrylate, 3-sulfopropyl (meth) acrylate, methacryloyloxyethylsulfonic acid, vinylbenzylsulfonic acid, 1-allyloxy-2-hydroxypropanesulfonic acid, allyloxypolyethylene glycol (polymerization degree of ethylene glycol moiety) : 10)
  • the structural unit derived from the monomer which has sulfonic acid and these salts is mentioned.
  • Examples of the counter ion of the salt include alkali metal ions such as sodium ion, potassium ion and lithium ion, alkaline earth metal ions such as calcium ion and magnesium ion, and ions such as ammonium ion.
  • a monomer having a sulfo group or a salt of sulfo group may be copolymerized, or a monomer having a sulfo group may be copolymerized. After synthesizing water-insoluble resin particles by polymerization, they may be neutralized with a base to form a sulfo group salt.
  • sulfo groups or monomers having a sulfo group salt acrylamide-2-propanesulfonic acid or a salt of acrylamide-2-propanesulfonic acid, and 3-sulfopropyl (meth) acrylate are included.
  • the structural unit derived from the monomer which has is preferable.
  • the counter ion of the salt sodium ion, potassium ion, lithium ion and ammonium ion are preferable, and acrylamide-2-propanesulfonic acid and sodium acrylamide-2-propanesulfonate are more preferable.
  • the water-insoluble resin particles may have at least one selected from a phosphoric acid group or a phosphoric acid group salt and a phosphonic acid group or a phosphonic acid group salt. That is, the water-insoluble resin particle is composed of a structural unit derived from a monomer having a phosphate group or a phosphate group salt as a structural unit and a monomer having a phosphonic acid group or a salt of a phosphonic acid group. It may contain at least one selected from the unit.
  • a structural unit derived from a monomer having a phosphate group or a phosphate group salt a structural unit represented by the following general formula 4 is preferable, and a monomer having a phosphonic acid group or a salt of a phosphonic acid group is preferable.
  • a structural unit represented by the following general formula 5 is preferable.
  • R 5 represents a methyl group or a hydrogen atom
  • L 5 represents a single bond or a group selected from the following group c.
  • M 1 and M 2 each independently represent a hydrogen atom or a cation.
  • the cation include alkali metal ions such as sodium ion, potassium ion and lithium ion, alkaline earth metal ions such as calcium ion and magnesium ion, and ions such as ammonium ion and monoethanolammonium ion.
  • R 6 and R 7 each independently represent a hydrogen atom or a methyl group, l represents an integer of 1 to 10, and * represents a bonding position.
  • Examples of the monomer that forms the structural unit represented by the general formula 4 or the structural unit represented by the general formula 5 include 2-methacryloyloxyethyl acid phosphate (for example, light ester P manufactured by Kyoeisha Chemical Co., Ltd.).
  • Examples of the counter ion of the salt include alkali metal ions such as sodium ion, potassium ion and lithium ion, alkaline earth metal ions such as calcium ion and magnesium ion, and ions such as ammonium ion. Further, dimethylaminoethyl methacrylate half salt of 2-methacryloyloxyethyl acid phosphate (Phosmer MH) is also preferably used.
  • Phosmer MH 2-methacryloyloxyethyl acid phosphate
  • a phosphonic acid group or a salt of a phosphonic acid group is used as a method for synthesizing water-insoluble resin particles having a phosphonic acid group or a salt of a phosphonic acid group.
  • a monomer, a monomer having a phosphoric acid group or a salt of a phosphoric acid group may be copolymerized, or a monomer having a phosphonic acid group or a phosphoric acid group may be copolymerized to form water-insoluble resin particles. After the synthesis, it may be neutralized with a base to form a phosphonic acid group salt or a phosphoric acid group salt.
  • the content of the carboxy group or the salt of the carboxy group in the water-insoluble resin particles is 1.0 mmol or more and 7.0 mmol or less per 1 g of the water-insoluble resin particles from the viewpoint of image forming property and dispersion stability of the water-insoluble resin particles. Is preferably 1.0 mmol or more and 6.0 mmol or less, more preferably 1.0 mmol or more and 5.0 mmol or less, and particularly preferably 1.5 mmol or more and 4.5 mmol or less.
  • the content of the carboxy group or the salt of the carboxy group is determined from the polymerization ratio of the polymerization components forming the water-insoluble resin particles, specifically, the structural unit derived from the monomer having a carboxy group or a salt of the carboxy group. It can be obtained by conversion.
  • the structure in which the hydrogen atom is removed from the carboxy group —COO
  • the structure in which the salt is removed from the salt of the carboxy group for example, — In the case of COONa, the amount of —COO
  • the amount of —COO can be regarded as “carboxy group or carboxy group salt content”.
  • the content of the sulfo group or the salt of the sulfo group, the phosphonic acid group or the salt of the phosphonic acid group, and the acidic group or the salt of the acidic group such as the phosphoric acid group or the salt of the phosphoric acid group is also determined in the same manner as above. Can be sought.
  • the water-insoluble resin particles have both a carboxy group or a carboxy group salt and a sulfo group or a sulfo group salt.
  • the water-insoluble resin particles have a sulfo group or a sulfo group salt in such a structure that the resin particles do not become water-soluble in addition to the carboxy group or the carboxy group salt in the structure, so that the hydrophilicity can be increased synergistically. .
  • the content of the sulfo group or the sulfo group salt in the water-insoluble resin particles is 1 g of the water-insoluble resin particles.
  • 0.005 mmol or more and 2.6 mmol or less are preferable, 0.1 mmol or more and 1.4 mmol or less are more preferable, 0.1 mmol or more and 1.2 mmol or less are more preferable, 0.2 mmol or more and 1.2 mmol or less are particularly preferable, and 4 mmol or more and 0.8 mmol or less are most preferable.
  • the content of the sulfo group or the salt of the sulfo group is 0.005 mmol or more, the dispersion stability of the water-insoluble resin particles is good, and when it is 2.6 mmol or less, the water insolubility is good.
  • the water-insoluble resin particles preferably contain a sulfo group or a salt of a sulfo group in an amount of 0.005 mmol or more per gram of the water-insoluble resin particles, and preferably contain 0.1 mmol or more. More preferred. Further, from the same viewpoint as described above, the water-insoluble resin particles preferably have a sulfo group or a salt of a sulfo group at at least one chain end of the polymer of the water-insoluble resin. When the water-insoluble resin particles have a carboxy group salt, the aggregating compound and the carboxy group salt interact with each other, and the particles tend to aggregate. By having a sulfo group or a sulfo group salt, the particles are dispersible. Aggregation can be suppressed without losing.
  • a potassium peroxodisulfate or peroxodioxide described below is used as a polymerization initiator.
  • examples thereof include a method using persulfate such as sodium sulfate and ammonium peroxodisulfate.
  • the sulfo group or the sulfo group with respect to the total amount of the carboxy group or the carboxy group salt per 1 g of the water-insoluble resin particles is 0.001 or more and 2.6 or less on a molar basis.
  • 0.08 or more and 2.3 or less are more preferable, 0.08 or more and 2.0 or less are more preferable, and 0.08 or more and 0.6 or less are particularly preferable.
  • the content of the structural unit derived from the monomer having a carboxy group or a salt of a carboxy group in the water-insoluble resin particles is the water-insoluble resin. It is preferably 10% by mass to 60% by mass, more preferably 10% by mass to 50% by mass, and even more preferably 25% by mass to 40% by mass with respect to the total mass of the particles.
  • the water-insoluble resin particles include a structural unit derived from a monomer having a sulfo group or a sulfo group salt (preferably a structural unit represented by the above general formula 3), a sulfo group or a sulfo group salt is added.
  • the content of the structural unit derived from the monomer having is preferably 5% by mass to 25% by mass, more preferably 10% by mass to 25% by mass, and more preferably 10% by mass to 20% by mass with respect to the total mass of the water-insoluble resin particles. More preferred is mass%.
  • the water-insoluble resin particles are synthesized by copolymerizing the structural units, the water-insoluble resin particles are derived from a monomer having an acidic group such as a carboxy group or a salt of a carboxy group or a salt of an acidic group.
  • a structural unit having a hydrophobic group and a structural unit derived from another monomer may be included. From the viewpoint of redispersibility of the pretreatment liquid, it preferably contains a structural unit having a hydrophobic group. “Redispersibility” means that when the water contained in the pretreatment liquid evaporates and the water-insoluble resin particles are precipitated and solidified, a new pretreatment liquid is supplied to the solidified product. It means the property that the resin particles are dispersed again in the pretreatment liquid.
  • the hydrophobic group in the structural unit having a hydrophobic group means a hydrocarbon group in which four or more carbon atoms are bonded. That is, here, a structural unit having a hydrocarbon group in which four or more carbon atoms are bonded to the side chain is defined as a structural unit having a hydrophobic group.
  • the structural unit which has a hydrophobic group is distinguished from the structural unit derived from the monomer which has the acidic group or the salt of an acidic group in the point which does not have an acidic group or a salt of an acidic group.
  • Examples of the structural unit having a hydrophobic group include structural units represented by the following general formulas A to F.
  • the water-insoluble resin particles preferably include at least one structural unit selected from structural units represented by the following general formulas A to F as structural units having a hydrophobic group.
  • R 11 represents a methyl group or a hydrogen atom.
  • R 12 and R 13 each independently represents a chain or branched alkyl group having 4 or more carbon atoms.
  • R 12 and R 13 are preferably each independently a chain or branched alkyl group having 4 to 20 carbon atoms.
  • n represents an integer of 0 to 6.
  • L 11 is a single bond or a linear, branched or cyclic alkylene group having 1 to 18 carbon atoms, an arylene group having 6 to 18 carbon atoms, —O—, —NH—, —S—. , —C ( ⁇ O) —, or a divalent linking group formed by linking two or more of these.
  • L 11 preferably has the following structure.
  • R 21 each independently represents a methyl group or a hydrogen atom.
  • n represents an integer of 1 to 8.
  • the content of the structural unit having a hydrophobic group is preferably 5% by mass to 40% by mass with respect to the total mass of the water-insoluble resin particles. % To 40% by mass is more preferable, and 20% to 40% by mass is more preferable.
  • the content (including a plurality of structural units) of a structural unit derived from a monomer having a carboxy group or a salt of a carboxy group preferably at least one of the structural units represented by the above general formula 1 and general formula 2).
  • the ratio of the content of structural units having hydrophobic groups (preferably the structural units represented by the above general formula A to general formula F) to the total content in the case (the total content when a plurality of structural units are included) is The mass is preferably 0.15 to 1.4, more preferably 0.2 to 1.4, and still more preferably 0.4 to 1.1. When the above ratio is within the above range, the redispersibility of the pretreatment liquid is more excellent.
  • a structural unit derived from another monomer other than those described above may be used as the structural unit of the water-insoluble resin particles.
  • the structural unit derived from the other monomer has no acidic group or salt of acidic group, and the above acidic group or acidic group in that it does not have a hydrophobic group (hydrocarbon group having 4 or more carbon atoms bonded).
  • a structural unit derived from a monomer having a salt of a group and a structural unit having a hydrophobic group described above are distinguished.
  • Examples of structural units derived from other monomers include, for example, methacrylic acid esters such as methyl methacrylate, ethyl methacrylate, 2-hydroxyethyl methacrylate; acrylic acid such as methyl acrylate, 2-hydroxyethyl acrylate.
  • esters Amides such as acrylamide, N- (2-hydroxyethyl) acrylamide, N, N-dimethylacrylamide, N, N-diethylacrylamide, isopropylacrylamide, N- (2-hydroxymethyl) acrylamide, methacrylamide , Vinyl cyanide monomers such as acrylonitrile and methacrylonitrile; ethylenically unsaturated carboxylic acid hydroxyalkyl ester monomers such as ⁇ -hydroxyethyl acrylate and ⁇ -hydroxyethyl methacrylate; Dialkylaminoalkyl (meth) acrylates such as methylaminoethyl (meth) acrylate, diethylaminoethyl (meth) acrylate and dimethylaminoethyl (meth) acrylate and diethylamino-2-hydroxypropyl (meth) acrylate and dimethylaminopropyl (meth) acrylate Tertiary salts such as
  • (Meth) acrylate means acrylate or methacrylate
  • (meth) acryl means acryl or methacryl.
  • structural units derived from these other monomers preferred are structural units derived from methyl methacrylate, ethyl methacrylate, and ethyl acrylate, more preferred are structural units derived from methyl methacrylate, ethyl methacrylate, Most preferred are structural units derived from methyl methacrylate.
  • the content of structural units derived from these other monomers is preferably 20% by mass to 80% by mass, more preferably 30% by mass to 75% by mass, and more preferably 30% by mass with respect to the total mass of the water-insoluble resin particles. % To 60% by mass is more preferable.
  • the water-insoluble resin particles are shown below, but are not limited to the following specific examples.
  • the subscript of each structural unit represents the composition ratio by mass reference
  • the water-insoluble resin particles may be used in the form of an aqueous dispersion called so-called latex.
  • the method for producing water-insoluble resin particles is not particularly limited, and batch polymerization, semi-batch polymerization, seed polymerization, and the like can be used.
  • As water-insoluble resin particles, core-shell particles and the like can also be suitably used.
  • core-shell particles it is preferable to have an acidic group on the shell side.
  • An emulsifier may be used when preparing the water-insoluble resin particles.
  • the emulsifier include nonionic surfactants such as polyethylene glycol alkyl ester surfactants, alkylphenyl ether surfactants, and alkyl ether surfactants; rosinates, fatty acid salts, sulfuric acid of higher alcohols.
  • Anionic interfaces such as ester salts, alkylbenzene sulfonates, alkyl diphenyl ether sulfonates, aliphatic sulfonates, aliphatic carboxylates, sulfate esters of nonionic surfactants, and formalin condensates of naphthalene sulfonate
  • An activator is mentioned.
  • these emulsifiers an anionic surfactant is preferable, and a formalin condensate of rosinate and naphthalenesulfonate is more preferable.
  • the emulsifier can be used alone or in combination of two or more.
  • a polymerization initiator When producing water-insoluble resin particles, it is preferable to use a polymerization initiator.
  • a radical polymerization initiator is preferable.
  • radical polymerization initiators by using a persulfate, a sulfo group or a salt of a sulfo group can be introduced at the terminal (polymer chain terminal) of the water-insoluble resin particles. By introducing a sulfo group or a salt of a sulfo group into the polymer chain terminal of the water-insoluble resin particles, the stability of the water-insoluble resin particles to the aggregating compound can be imparted.
  • the water-insoluble resin particles are preferably water-insoluble resin particles polymerized using radical persulfate as a polymerization initiator, and at least one polymer chain end of the water-insoluble resin particles is a sulfo group or a sulfo group.
  • a salt is preferred.
  • polymerization initiator examples include persulfates such as potassium peroxodisulfate (potassium persulfate), sodium peroxodisulfate (sodium persulfate), and ammonium peroxodisulfate (ammonium persulfate); 2,2-azobis- (2 -Aminodiproban) dihydrochloride, 4,4'-azobis (4-cyanovaleric acid), 2,2'-azobis [N- (2-carboxyethyl) -2-methylpropionamidine] hydrochloride, 2,2 '-Azobis ⁇ 2-methyl-N- [2- (1-hydroxybutyl)] propionamide ⁇ , 2,2'-azobis [2-methyl-N- (2-hydroxyethyl) propionamide], 2,2 '-Azobis (2-amidinopropane) hydrochloride, 2,2'-azobis [2- (3,4,5,6-tetrahydropyrimidin-2-yl) Lopan] hydrochlor
  • potassium persulfate, sodium persulfate, ammonium persulfate, and cumene hydroperoxide are preferable, and potassium persulfate, sodium persulfate, and ammonium persulfate are more preferable.
  • reducing agent examples include sulfite, bisulfite, pyrosulfite, nitrite, nithionate, thiosulfate, formaldehyde sulfonate, benzaldehyde sulfonate, carboxylic acids and salts of carboxylic acids (for example, , L-ascorbic acid, erythorbic acid, tartaric acid, citric acid), reducing sugars (eg, dextrose, saccharose), and amines (eg, dimethylaniline, triethanolamine).
  • carboxylic acids and salts of carboxylic acids for example, L-ascorbic acid, erythorbic acid, tartaric acid, citric acid
  • reducing sugars eg, dextrose, saccharose
  • amines eg, dimethylaniline, triethanolamine.
  • Preferable examples include carboxylic acids and salts of carboxylic acids, and more preferable examples include L-ascorbic
  • the pretreatment liquid contains at least one compound that aggregates the colorant in the ink composition (that is, an aggregating compound).
  • “Aggregating the colorant” refers to increasing the particle diameter of secondary particles formed of the colorant by destabilizing the dispersion state of the colorant dispersed in the ink composition. The change in the particle diameter can be confirmed by measuring the volume average particle diameter by a dynamic light scattering method such as Nanotrac particle size distribution analyzer UPA-EX150 (manufactured by Nikkiso Co., Ltd.).
  • the pretreatment liquid contains a compound that aggregates the colorant, the colorant contained in the ink composition described later can be aggregated, and a high-definition image can be formed.
  • the aggregating compound a compound that agglomerates at least one of the resin particles having an anionic dissociation group other than the sulfo group and the anionic colorant in the ink composition is preferable.
  • Examples of the compound for aggregating the colorant include acidic compounds such as organic acidic compounds and inorganic acidic compounds, polyvalent metal salts, and cationic compounds. Among these, from the viewpoint of aggregation rate, an acidic compound is preferable, and an organic acidic compound is more preferable.
  • Examples of the acidic compound include acidic substances that can lower the pH of the ink composition. Either an organic acidic compound or an inorganic acidic compound may be used, or two or more organic acidic compounds and inorganic acidic compounds may be used in combination. Good.
  • the organic acidic compound can aggregate components in the ink composition.
  • the organic acidic compound include a compound having a phosphoric acid group, a compound having a phosphonic acid group, a compound having a phosphinic acid group, a compound having a sulfuric acid group, a compound having a sulfonic acid group, a compound having a sulfinic acid group, And compounds having a group.
  • the organic acidic compound is preferably a compound having a phosphate group or a carboxy group, and more preferably a compound having a carboxy group.
  • Examples of the compound having a carboxy group include polyacrylic acid, acetic acid, glycolic acid, malonic acid, malic acid (preferably DL-malic acid), maleic acid, ascorbic acid, succinic acid, glutaric acid, fumaric acid, citric acid, Tartaric acid, phthalic acid, 4-methylphthalic acid, lactic acid, pyrrolidone carboxylic acid, pyrone carboxylic acid, pyrrole carboxylic acid, furan carboxylic acid, pyridine carboxylic acid, coumaric acid, thiophene carboxylic acid, nicotinic acid, or derivatives of these compounds, or These salts (for example, polyvalent metal salts) are preferred. These compounds may be used alone or in combination of two or more.
  • a divalent or higher carboxylic acid (hereinafter also referred to as a polyvalent carboxylic acid) is preferable from the viewpoint of the aggregation rate of the ink composition, and malonic acid, malic acid, maleic acid, succinic acid, and glutaric acid.
  • Acid, fumaric acid, tartaric acid, 4-methylphthalic acid, and citric acid are more preferable, and malonic acid, malic acid, tartaric acid, and citric acid are particularly preferable.
  • the organic acidic compound contained in the pretreatment liquid preferably has a low pKa. Dispersion stability is reduced by bringing the surface charge of particles such as pigments and polymer particles in the ink composition, which is stabilized by a weakly acidic functional group such as a carboxy group, into contact with an organic acidic compound having a lower pKa. Can be reduced.
  • the organic acidic compound contained in the pretreatment liquid preferably has a low pKa, a high solubility in water and a valence of 2 or more, and a functional group that stabilizes the dispersion of particles in the ink composition (for example, , A carboxyl group) is more preferably a divalent or trivalent acidic substance having a high buffer capacity in a pH range lower than the pKa.
  • the inorganic acidic compound can agglomerate components in the ink composition.
  • the inorganic acidic compound contained in the pretreatment liquid include phosphoric acid, phosphoric acid compound, nitric acid, nitrous acid, sulfuric acid, and hydrochloric acid, but are not particularly limited thereto.
  • phosphoric acid and a phosphoric acid compound are preferable from the viewpoint of suppressing the roughness of the image and the aggregation speed of the ink.
  • Phosphoric acid has a low water solubility (25 ° C.) of 0.0018 g / 100 g of water when calcium salt (calcium phosphate) is used. Therefore, when the inorganic acidic compound contained in the pretreatment liquid is phosphoric acid, the calcium salt is not dissolved but fixed, and the effect of suppressing the occurrence of roughness on the surface of the image area is high. In particular, when a recording medium having a coating layer containing calcium carbonate is used as the recording medium, phosphoric acid is advantageous as the inorganic acidic compound contained in the pretreatment liquid.
  • phosphoric acid compound for example, phosphorous acid, hypophosphorous acid, pyrophosphoric acid, metaphosphoric acid, polyphosphoric acid, or a salt thereof can be used.
  • polyvalent metal salt examples include alkaline earth metals belonging to Group 2 of the periodic table (for example, magnesium and calcium), Group 3 transition metals (for example, lanthanum) of the periodic table, and cations from Group 13 of the periodic table. (For example, aluminum) and the salt of lanthanides (for example, neodymium) can be mentioned.
  • the metal salt carboxylate (such as formic acid, acetic acid, and benzoate), nitrate, chloride, and thiocyanate are preferable.
  • calcium salts or magnesium salts of carboxylic acids such as formic acid, acetic acid, and benzoates
  • calcium salts or magnesium salts of nitric acid, calcium chloride, magnesium chloride, and calcium salts or magnesium salts of thiocyanic acid are more preferable.
  • cationic compound Preferred examples of the cationic compound include cationic resins and cationic surfactants.
  • cationic resin examples include epichlorohydrin / dimethylamine addition polymer, polycondensate of dicyandiamide and formalin or diethylenetriamine, dimethyldiallylammonium chloride / SO 2 copolymer, diallylamine salt / SO 2 copolymer, dimethyl diallylammonium.
  • a primary, secondary, or tertiary amine salt type compound is preferable.
  • the amine salt type compounds include compounds such as hydrochloride or acetate (for example, laurylamine, coconutamine, stearylamine, rosinamine), quaternary ammonium salt type compounds (for example, lauryltrimethylammonium chloride, cetyltrimethylammonium Chloride, lauryldimethylbenzylammonium chloride, benzyltributylammonium chloride, benzalkonium chloride), pyridinium salt type compounds (eg cetylpyridinium chloride, cetylpyridinium bromide), imidazoline type cationic compounds (eg 2-heptadecenyl-hydroxyethylimidazoline) ), And ethylene oxide adducts of higher alkylamines (eg, dihydroxyethyl stearylamine).
  • hydrochloride or acetate for example, laurylamine,
  • amphoteric surfactants that are cationic in a desired pH range can also be used, such as amino acid type amphoteric surfactants, R—NH—CH 2 CH 2 —COOH type compounds (where R is an alkyl group). Group), carboxylate-type amphoteric surfactants (for example, stearyldimethylbetaine, lauryldihydroxyethylbetaine), sulfate ester-type, sulfonate-type, or phosphate-ester-type amphoteric surfactants.
  • amino acid type amphoteric surfactants R—NH—CH 2 CH 2 —COOH type compounds (where R is an alkyl group). Group
  • carboxylate-type amphoteric surfactants for example, stearyldimethylbetaine, lauryldihydroxyethylbetaine
  • sulfate ester-type for example, stearyldimethylbetaine, lauryldihydroxyethylbetaine
  • the content (total content) of the aggregating compound in the total mass of the pretreatment liquid is not particularly limited, but the content is preferably 5% by mass to 40% by mass with respect to the total amount of the pretreatment liquid, and 10% by mass. % To 30% by mass is more preferable.
  • the content is 5% by mass or more, the roughness of the image can be suppressed, and when the content is 40% by mass or less, the abrasion resistance of the image is improved.
  • the content ratio of the organic acidic compound and the inorganic acidic compound is determined from the viewpoint of aggregation rate and roughness control.
  • the content of is preferably 5 mol% to 50 mol%, more preferably 10 mol% to 40 mol%, and still more preferably 15 mol% to 35 mol%.
  • the ratio of the content of water-insoluble resin particles to the compound (aggregating compound) that aggregates the colorant in the pretreatment liquid is effective.
  • 0.01 to 2.0 is preferable and 0.01 to 1.0 is more preferable on a mass basis.
  • the pretreatment liquid preferably contains water.
  • the content of water is not particularly limited, but is preferably in the range of 10% by mass to 99% by mass, more preferably 50% by mass to 90% by mass, and still more preferably, with respect to the total mass of the pretreatment liquid. 60% by mass to 80% by mass.
  • the pretreatment liquid preferably contains at least one selected from organic solvents.
  • the organic solvent is preferably a water-soluble organic solvent that dissolves 5 g or more in 100 g of water at 20 ° C.
  • the pretreatment liquid preferably contains a water-soluble organic solvent in a content of 15% by mass or less with respect to the total mass of the pretreatment liquid from the viewpoint of suppressing occurrence of image roughness and stability of the treatment liquid.
  • the content is preferably 15% by mass or less, more preferably 5% by mass or more and 15% by mass or less.
  • the water-soluble organic solvent the same water-soluble organic solvents as those contained in the ink composition described later can be used.
  • the solubility parameter value (hereinafter also referred to as “SP value”, unit: MPa 1/2 ) is 25 MPa 1 from the viewpoint of suppressing the occurrence of image roughness and the stability of the processing solution.
  • MP value solubility parameter value
  • unit: MPa 1/2 the solubility parameter value
  • SP value in this specification points out SP value calculated by the Okitsu method.
  • the Okitsu method is the Japan Society for Adhesion, Vol. 29, no. 6 (1993) 249 to 259, a SP value calculation method using the theoretical formula (the theoretical formula of the solubility parameter (SP value) proposed by Toshinao Okitsu).
  • the Okitsu method is the Japan Society for Adhesion, Vol. 29, no. 6 (1993) 249 to 259, a SP value calculation method using the theoretical formula (the theoretical formula of the solubility parameter (SP value) proposed by Toshinao Okitsu).
  • SP value of the water-soluble organic solvent is preferably 30 MPa 1/2 or more 50 MPa 1/2 or less is at 22 MPa 1/2 or more 50 MPa 1/2 or less it is more preferable, and further preferably 35 MPa 1/2 or more 50MPa is 1/2 or less.
  • water-soluble organic solvents having an SP value of 22 MPa 1/2 or more examples include propylene glycol (SP value: 35.12 MPa 1/2 ), glycerin (SP value: 48.75 MPa 1/2 ), 1,4-butanediol ( SP value: 31.35 MPa 1/2 ), triethylene glycol (SP value: 29.58 MPa 1/2 ), 2-pyrrolidone (SP value: 25.93 MPa 1/2 ) and the like, and propylene glycol or glycerin is used. preferable.
  • the pretreatment liquid may contain a nitrogen-containing heterocyclic compound. Thereby, the abrasion resistance of the image and the transportability of the recording medium are improved.
  • a nitrogen-containing 5-membered ring structure or a 6-membered ring structure is preferable, and a nitrogen-containing 5-membered ring structure is particularly preferable.
  • a 5- or 6-membered heterocyclic structure containing at least one kind of carbon atom, nitrogen atom, oxygen atom, sulfur atom and selenium atom is preferable.
  • This hetero ring may be condensed with a carbon aromatic ring or a hetero aromatic ring.
  • heterocycle examples include a tetrazole ring, a triazole ring, an imidazole ring, a thiadiazole ring, an oxadiazole ring, a selenodiazole ring, an oxazole ring, a thiazole ring, a benzoxazole ring, a benzothiazole ring, a benzimidazole ring, a pyrimidine ring, Examples include a triazaindene ring, a tetraazaindene ring, and a pentaazaindene ring.
  • These rings may have a substituent.
  • substituents include a nitro group, a halogen atom (for example, chlorine atom, bromine atom), a mercapto group, a cyano group, and a substituted or unsubstituted alkyl group (for example, , Methyl, ethyl, propyl, t-butyl, cyanoethyl groups), aryl groups (for example, phenyl, 4-methanesulfonamidophenyl, 4-methylphenyl, 3,4-dichlorophenyl, naphthyl groups), Alkenyl groups (for example, allyl groups), aralkyl groups (for example, benzyl, 4-methylbenzyl, and phenethyl groups), sulfonyl groups (for example, methanesulfonyl, ethanesulfonyl, and p-toluenesulfonyl groups
  • preferable nitrogen-containing heterocyclic compounds include the following compounds. That is, imidazole, benzimidazole, benzoindazole, benzotriazole, tetrazole, benzoxazole, benzothiazole, pyridine, quinoline, pyrimidine, piperidine, piperazine, quinoxaline, morpholine and the like, and these include the above alkyl group, carboxy group And may have a substituent such as a sulfo group.
  • Preferred nitrogen-containing 6-membered ring compounds include compounds having a triazine ring, a pyrimidine ring, a pyridine ring, a pyrroline ring, a piperidine ring, a pyridazine ring, or a pyrazine ring, and among them, a compound having a triazine ring or a pyrimidine ring is preferable.
  • These nitrogen-containing 6-membered ring compounds may have a substituent, in which case the substituent is an alkyl group having 1 to 6 carbon atoms (more preferably an alkyl group having 1 to 3 carbon atoms), or 1 to 3 carbon atoms.
  • 6 alkoxy groups (more preferably 1 to 3 alkoxy groups), hydroxyl groups, carboxy groups, mercapto groups, alkoxyalkyl groups having 1 to 6 carbon atoms (more preferably 1 to 3 alkoxyalkyl groups), and 1 to 3 carbon atoms.
  • 6 hydroxyalkyl group (more preferably 1 to 3 hydroxyalkyl groups).
  • preferable nitrogen-containing 6-membered ring compounds include triazine, methyltriazine, dimethyltriazine, hydroxyethyltriazine ring, pyrimidine, 4-methylpyrimidine, pyridine, and pyrroline.
  • the pretreatment liquid may contain at least one antifoaming agent as necessary.
  • the antifoaming agent include silicone compounds (silicone defoaming agents) and pluronic compounds (pluronic defoaming agents), among which silicone antifoaming agents are preferable.
  • silicone-based antifoaming agent a silicone-based antifoaming agent having a polysiloxane structure is preferable.
  • a commercial item can be used as an antifoamer.
  • Commercially available products include BYK-012, 017, 021, 022, 024, 025, 038, 094 (above, manufactured by Big Chemie Japan Co., Ltd.), KS-537, KS-604, KM-72F (above, Shin-Etsu Chemical) Kogyo Co., Ltd.), TSA-739 (Momentive Performance Materials Japan G.K.), Olfin AF104 (Nisshin Chemical Co., Ltd.), and the like.
  • BYK-017, 021, 022, 024, 025, 094, KS-537, KS-604, KM-72F, and TSA-739 which are silicone-based antifoaming agents, are preferable.
  • BYK-024 is most preferred.
  • the content of the antifoaming agent is preferably 0.0001% by mass to 1% by mass, and 0.001% by mass to 0.1% by mass with respect to the total mass of the pretreatment liquid.
  • the mass% is more preferable.
  • the pretreatment liquid can contain other additives in addition to the components.
  • Other additives in the pretreatment liquid are the same as other additives in the ink composition described later.
  • a pretreatment liquid there is no restriction
  • the surface tension of the pretreatment liquid can be adjusted, for example, by adding a surfactant.
  • the surface tension of the pretreatment liquid can be measured at 25 ° C. by a plate method using an Automatic Surface Tensiometer CBVP-Z (manufactured by Kyowa Interface Science Co., Ltd.).
  • the pretreatment liquid preferably has a pH (25 ° C. ⁇ 1 ° C.) of 7.0 or less, more preferably 0.5 to 3.5, from the viewpoint of the aggregation rate of the ink composition. More preferably, it is 5 to 2.0.
  • the pH can be measured using a pH meter WM-50EG (manufactured by Toa DDK Co., Ltd.) in an environment of 25 ° C.
  • the viscosity of the pretreatment liquid is preferably in the range of 1 mPa ⁇ s to 30 mPa ⁇ s, more preferably in the range of 1 mPa ⁇ s to 20 mPa ⁇ s, from the viewpoint of the aggregation rate of the ink composition, and 2 mPa ⁇ s to 15 mPa ⁇ s. Is more preferable, and a range of 2 mPa ⁇ s to 10 mPa ⁇ s is particularly preferable.
  • the viscosity can be measured under the condition of 25 ° C. using VISCOMETER TV-22 (manufactured by TOKI SANGYO CO. LTD).
  • the ink composition includes a colorant and water.
  • the ink composition may contain resin particles, a pigment dispersant (polymer dispersant), an organic solvent, a neutralizer, and other components as necessary.
  • the ink composition contains at least one colorant.
  • the colorant is not particularly limited and may be a pigment or a dye.
  • the colorant is preferably an anionic colorant from the viewpoint of excellent cohesiveness when contacted with the aforementioned cohesive compound.
  • the “anionic colorant” as used herein refers to a carboxy group, a sulfonate group, and a phosphate group in the structure (in the structure of the dispersant when the colorant is coated with a dispersant described later).
  • the coloring agent which has anionic groups, such as, is shown.
  • the pigment may be, for example, an organic pigment or an inorganic pigment.
  • the pigment is preferably a pigment that is almost insoluble or hardly soluble in water from the viewpoint of ink colorability.
  • organic pigments include azo lakes, azo pigments, phthalocyanine pigments, perylene pigments, perinone pigments, anthraquinone pigments, quinacridone pigments, dioxazine pigments, diketopyrrolopyrrole pigments, thioindigo pigments, isoindolinone pigments, and quinophthalone pigments.
  • dye lakes such as cyclic pigments, basic dye lakes, and acid dye lakes, nitro pigments, nitroso pigments, aniline black, and daylight fluorescent pigments.
  • inorganic pigments include titanium oxide, iron oxide, calcium carbonate, barium sulfate, aluminum hydroxide, barium yellow, cadmium red, chrome yellow, and carbon black.
  • any pigment that is not described in the color index can be used as long as it is dispersible in the aqueous phase.
  • pigments surface-treated with a surfactant, a polymer dispersant, etc., and graft carbon can also be used.
  • azo pigments phthalocyanine pigments, anthraquinone pigments, quinacridone pigments, and carbon black pigments are particularly preferable, and anionic azo pigments, anionic phthalocyanine pigments, and anionic quinacridone pigments are more preferable.
  • a form in which the pigment is dispersed by a dispersant is preferable.
  • a form in which the pigment is dispersed with the polymer dispersant that is, a form in which at least a part of the pigment is coated with the polymer dispersant is particularly preferable.
  • the pigment at least partially coated with the polymer dispersant is referred to as “resin-coated pigment”.
  • the dispersant may be a polymer dispersant or a low molecular surfactant type dispersant.
  • the polymer dispersant may be a non-crosslinked polymer dispersant (non-crosslinked polymer dispersant), or a polymer dispersant crosslinked with a crosslinking agent (crosslinked polymer dispersant).
  • the non-crosslinked polymer dispersant may be a water-soluble non-crosslinked polymer dispersant or a water-insoluble non-crosslinked polymer dispersant.
  • As the low molecular surfactant type dispersant surfactant type dispersants described in paragraphs 0016 to 0020 of JP 2010-188661 A can be used.
  • hydrophilic polymer compounds can be used as the water-soluble non-crosslinked polymer dispersant.
  • water-soluble non-crosslinked polymer dispersant for example, natural hydrophilic polymer compounds described in paragraphs 0021 to 0022 of JP 2010-188661 A can be used.
  • a synthetic hydrophilic polymer compound can also be used as the water-soluble non-crosslinked polymer dispersant.
  • Synthetic hydrophilic polymer compounds include, for example, vinyl polymers such as polyvinyl alcohol, polyvinyl pyrrolidone, and polyvinyl methyl ether, acrylic resins such as polyacrylamide, polyacrylic acid or alkali metal salts thereof, and water-soluble styrene acrylic resins.
  • Resin water-soluble styrene maleic acid resin, water-soluble vinyl naphthalene acrylic resin, water-soluble vinyl naphthalene maleic resin, polyvinyl pyrrolidone, polyvinyl alcohol, alkali metal salt of ⁇ -naphthalene sulfonic acid formalin condensate, quaternary ammonium and amino group And a polymer compound having a cationic functional group salt such as a side chain.
  • a polymer compound containing a carboxy group is preferable.
  • an acrylic resin such as a water-soluble styrene acrylic resin, a water-soluble styrene maleic resin, and a water-soluble vinyl naphthalene acrylic resin.
  • a polymer compound containing a carboxy group such as a water-soluble vinyl naphthalene maleic resin is particularly preferable.
  • the water-insoluble dispersant a polymer having both a hydrophobic portion and a hydrophilic portion can be used.
  • the water-insoluble dispersant include styrene- (meth) acrylic acid copolymer, styrene- (meth) acrylic acid- (meth) acrylic acid ester copolymer, (meth) acrylic acid ester- (meth) acrylic.
  • examples include acid copolymers, polyethylene glycol (meth) acrylate- (meth) acrylic acid copolymers, and styrene-maleic acid copolymers.
  • Styrene- (meth) acrylic acid copolymer (meth) acrylic acid ester- (meth) acrylic acid copolymer, polyethylene glycol (meth) acrylate- (meth) acrylic acid copolymer, and styrene-maleic acid copolymer
  • the coalescence may be a binary copolymer or a ternary or higher copolymer.
  • (meth) acrylic acid ester- (meth) acrylic acid copolymer is preferable as the non-crosslinked polymer dispersant, and benzyl (meth) acrylate- (meth) acrylic acid-methyl (meth) acrylate ternary copolymer is preferable.
  • Polymers are particularly preferred.
  • (Meth) acrylic acid refers to acrylic acid or methacrylic acid
  • (meth) acrylate refers to acrylate or methacrylate.
  • the copolymer may be a random copolymer, a block copolymer, or a graft copolymer.
  • the weight average molecular weight of the non-crosslinked polymer dispersant is preferably 3,000 to 200,000, more preferably 5,000 to 100,000, still more preferably 5,000 to 80,000, particularly preferably 10,000. ⁇ 60,000.
  • the weight average molecular weight can be measured by the method described above.
  • the acid value of the non-crosslinked polymer dispersant is not particularly limited, but from the viewpoint of cohesiveness, the acid value of the non-crosslinked polymer dispersant is larger than the acid value of the resin particles (preferably self-dispersing resin particles) described later. It is preferable.
  • the crosslinked polymer dispersant is formed by crosslinking a polymer (uncrosslinked polymer) with a crosslinking agent.
  • the polymer is not particularly limited, and various polymers can be used. Among them, polyvinyls, polyurethanes, and polyesters that can function as a water-soluble dispersant are preferable, and polyvinyls are more preferable.
  • the polymer is preferably a copolymer obtained using a carboxy group-containing monomer as a copolymerization component.
  • carboxy group-containing monomer examples include monomers containing a carboxy group such as (meth) acrylic acid, ⁇ -carboxyethyl acrylate, fumaric acid, itaconic acid, maleic acid, and crotonic acid.
  • (meth) acrylic acid and ⁇ -carboxyethyl acrylate are preferable from the viewpoint of the crosslinkability and dispersion stability of the polymer.
  • the polymer Since the polymer is crosslinked by a crosslinking agent, it has a functional group that can be crosslinked by the crosslinking agent.
  • the crosslinkable functional group is not particularly limited, and examples thereof include a carboxy group or a salt thereof, an isocyanate group, and an epoxy group, and a carboxy group or a salt thereof is preferable from the viewpoint of improving dispersibility.
  • the acid value of the polymer is preferably 90 mgKOH / g or more, and more preferably 95 mgKOH / g or more, from the viewpoint of water solubility of the polymer. Further, from the viewpoint of the dispersibility and dispersion stability of the pigment, it is preferably 100 mgKOH / g to 180 mgKOH / g, more preferably 100 mgKOH / g to 170 mgKOH / g, and 100 mgKOH / g to 160 mgKOH / g. Is more preferable.
  • an acid value can be measured by the method as described in a JIS specification (JISK0070: 1992).
  • the weight average molecular weight (Mw) of the polymer is preferably 5,0000 to 120,000, more preferably 6,0000 to 120,000, still more preferably 6,0000 to 100,000, and 6,0000 to 90,000. Particularly preferred.
  • the weight average molecular weight can be measured by the method described above.
  • the polymer preferably further has at least one hydrophobic monomer as a copolymerization component.
  • hydrophobic monomer examples include (meth) acrylate having an aromatic ring group such as alkyl (meth) acrylate having 1 to 20 carbon atoms, benzyl (meth) acrylate and phenoxyethyl (meth) acrylate, styrene and derivatives thereof. Can be mentioned.
  • the copolymerization form of the polymer is not particularly limited, and the polymer may be a random polymer, a block polymer, or a graft polymer.
  • the method for synthesizing the polymer is not particularly limited, but random polymerization of vinyl monomers is preferable from the viewpoint of dispersion stability.
  • the cross-linking agent is not particularly limited as long as it is a compound having two or more sites that react with the polymer. Among them, a compound having two or more epoxy groups from the viewpoint of excellent reactivity with a carboxy group. (A bifunctional or higher functional epoxy compound) is preferred.
  • the crosslinking agent include ethylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, 1,6-hexanediol diglycidyl ether, diethylene glycol diglycidyl ether, dipropylene glycol diglycidyl ether, polypropylene glycol diglycidyl ether, and trimethylol. Examples include propane triglycidyl ether. Among these, polyethylene glycol diglycidyl ether, diethylene glycol diglycidyl ether, and trimethylolpropane triglycidyl ether are preferable.
  • Examples of the method of coating the pigment with the cross-linked polymer dispersant include a method in which the pigment is dispersed using a water-soluble or water-insoluble polymer and then the polymer is cross-linked with the cross-linking agent to prepare a pigment dispersion. .
  • the mass ratio of pigment to dispersant is preferably in the range of 1: 0.06 to 1: 3, more preferably in the range of 1: 0.125 to 1: 2. More preferably, it is 1: 0.125 to 1: 1.5.
  • the average particle diameter of the pigment is preferably 10 nm to 200 nm, more preferably 10 nm to 150 nm, and even more preferably 10 nm to 100 nm.
  • the particle size distribution of the pigment is not particularly limited, and may be either a wide particle size distribution or a monodisperse particle size distribution.
  • Two or more pigments having a monodispersed particle size distribution may be mixed and used.
  • the average particle size and particle size distribution of the pigment can be determined by measuring the volume average particle size by a dynamic light scattering method using a nanotrack particle size distribution analyzer UPA-EX150 (manufactured by Nikkiso Co., Ltd.). Is.
  • the content of the pigment in the ink composition is preferably 1% by mass to 25% by mass and more preferably 2% by mass to 20% by mass with respect to the total mass of the ink composition from the viewpoint of image density. 2% by mass to 10% by mass is particularly preferable. You may use a pigment individually by 1 type or in combination of 2 or more types.
  • dye As the dye, known dyes can be used without particular limitation.
  • the dyes described in JP-A Nos. 2001-115066, 2001-335714, and 2002-249677 are used in the present invention. It can use suitably also in a form.
  • carrier may be used.
  • the carrier holding the dye (water-insoluble colored particles) can be used as an aqueous dispersion using a dispersant.
  • the carrier is not particularly limited as long as it is insoluble in water or hardly soluble in water, and inorganic materials, organic materials, and composite materials thereof can be used.
  • the carriers described in JP-A Nos. 2001-181549 and 2007-169418 can be suitably used in one embodiment of the present invention.
  • the ink composition preferably contains at least one resin particle.
  • the resin particles are particles that exist separately from the pigment.
  • the resin particles preferably include particles that aggregate when brought into contact with the aggregating compound described above.
  • the resin particles are preferably resin particles having an anionic dissociation group other than a sulfo group from the viewpoint of excellent cohesiveness when contacted with the aforementioned cohesive compound. Details of the resin particles having an anionic dissociation group other than the sulfo group will be described later.
  • Resin particles having a sulfo group as an anionic dissociation group are preferable because the dispersion stability of the resin particles themselves is greatly improved, so that they do not aggregate even when they come into contact with the aggregating compound in the pretreatment liquid, and image formation becomes difficult. Absent.
  • the resin particles are preferably water-insoluble or poorly water-soluble resin particles.
  • “Non-water-soluble or sparingly water-soluble” means that when the resin is dried at 105 ° C. for 2 hours and then dissolved in 100 g of water at 25 ° C., the dissolved amount is 15 g or less. . From the viewpoint of improving the continuous ejection property and ejection stability of the ink, the dissolved amount is preferably 10 g or less, more preferably 5 g or less, and even more preferably 1 g or less.
  • the dissolution amount is the dissolution amount when 100% neutralized with sodium hydroxide or acetic acid according to the type of salt-forming group of the water-insoluble or poorly water-soluble resin particles.
  • the resin particles may be any particles of thermoplastic resin and thermosetting resin.
  • a resin having an anionic group such as a system material (for example, melamine resin, melamine formaldehyde resin, aminoalkyd cocondensation resin, urea resin, urea resin), or a copolymer or a mixture thereof.
  • a modified acrylic resin is, for example, an acrylic monomer having an anionic dissociable group other than a sulfo group (anionic group-containing acrylic monomer) and, if necessary, It is obtained by polymerizing another monomer copolymerizable with an anionic dissociative group-containing acrylic monomer in a solvent.
  • anionic dissociable group-containing acrylic monomer include an acrylic monomer having one or more selected from the group consisting of a carboxy group and a phosphonic acid group.
  • an acrylic monomer having a carboxy group for example, acrylic acid, methacrylic acid, crotonic acid, ethacrylic acid, propylacrylic acid, isopropylacrylic acid, itaconic acid, fumaric acid
  • acrylic acid or methacrylic acid is particularly preferable.
  • the resin particles are preferably self-dispersing resin particles (self-dispersing resin particles) from the viewpoint of ejection stability and liquid stability (particularly dispersion stability) of a system containing a colorant.
  • a self-dispersing resin can be dispersed in an aqueous medium due to functional groups (particularly acidic groups or salts thereof) possessed by the polymer itself when dispersed by the phase inversion emulsification method in the absence of a surfactant.
  • a water-insoluble polymer is preferably self-dispersing resin particles (self-dispersing resin particles) from the viewpoint of ejection stability and liquid stability (particularly dispersion stability) of a system containing a colorant.
  • a self-dispersing resin can be dispersed in an aqueous medium due to functional groups (particularly acidic groups or salts thereof) possessed by the polymer itself when dispersed by the phase inversion emulsification method in the absence of a surfactant.
  • a water-insoluble polymer is preferably
  • the dispersed state means both an emulsified state (emulsion) in which a water-insoluble polymer is dispersed in an aqueous medium in a liquid state and a dispersed state (suspension) in which a water-insoluble polymer is dispersed in an aqueous medium in a solid state.
  • An aqueous medium refers to a medium containing water.
  • the aqueous medium may contain a hydrophilic organic solvent as necessary.
  • the aqueous medium preferably contains water and 0.2% by mass or less of a hydrophilic organic solvent, more preferably water alone.
  • the self-dispersing resin is preferably self-dispersing resin particles that can be in a dispersed state in which a water-insoluble polymer is dispersed in a solid state from the viewpoint of aggregation rate and fixing property when contained in the ink composition.
  • Examples of a method for obtaining an emulsified or dispersed state of the self-dispersing resin that is, a method for preparing an aqueous dispersion of self-dispersing resin particles include a phase inversion emulsification method.
  • a phase inversion emulsification method for example, a self-dispersing resin is dissolved or dispersed in a solvent (for example, a water-soluble organic solvent) and then poured into water as it is without adding a surfactant.
  • Examples include a method of obtaining an aqueous dispersion in an emulsified or dispersed state after stirring and mixing in a state in which a salt-forming group (for example, acidic group) of the resin is neutralized and removing the solvent.
  • a salt-forming group for example, acidic group
  • the stable emulsification or dispersion state in the self-dispersing resin means a solution obtained by dissolving 30 g of a water-insoluble polymer in 70 g of an organic solvent (for example, methyl ethyl ketone), neutralization capable of neutralizing a salt-forming group of the water-insoluble polymer 100%.
  • Agent sodium hydroxide when the salt-forming group is anionic, acetic acid when cationic
  • 200 g of water were mixed and stirred (apparatus: stirring apparatus with stirring blades, rotation speed 200 rpm, 30 minutes, 25 ° C.). After that, even after the organic solvent is removed from the mixed solution, it means that the emulsified or dispersed state is stably present at 25 ° C. for at least one week (that is, a state where precipitation cannot be visually confirmed).
  • the stability of the emulsified or dispersed state in the self-dispersing resin can also be confirmed by an accelerated sedimentation test by centrifugation.
  • the stability of the sedimentation acceleration test by centrifugation is, for example, adjusted by adjusting the aqueous dispersion of resin particles obtained by the above method to a solid content concentration of 25% by mass and then centrifuging at 12000 rpm for 1 hour. It can be evaluated by measuring the solid content concentration of the supernatant after separation. If the ratio of the solid content concentration after centrifugation to the solid content concentration before centrifugation is large (if it is a value close to 1), the resin particles will not settle by centrifugation, that is, the aqueous dispersion of resin particles Means more stable.
  • the ratio of the solid content concentration before and after centrifugation is preferably 0.8 or more, more preferably 0.9 or more, and particularly preferably 0.95 or more.
  • the self-dispersing resin preferably has a water-soluble component content that is water-soluble when in a dispersed state of 10% by mass or less, more preferably 8% by mass or less, and 6% by mass or less. More preferably.
  • a water-soluble component content that is water-soluble when in a dispersed state of 10% by mass or less, more preferably 8% by mass or less, and 6% by mass or less. More preferably.
  • the water-soluble component is a compound that is contained in a self-dispersing resin and that dissolves in water when the self-dispersing resin is in a dispersed state.
  • the water-soluble component is a water-soluble compound that is by-produced or mixed when the self-dispersing resin is produced.
  • the main chain skeleton of the water-insoluble polymer is not particularly limited.
  • a vinyl polymer or a condensation polymer for example, epoxy resin, polyester, polyurethane, polyamide, cellulose, polyether, polyurea, polyimide, polycarbonate
  • vinyl polymers are particularly preferable.
  • Preferable examples of the vinyl polymer and the monomer constituting the vinyl polymer include those described in JP-A Nos. 2001-181549 and 2002-88294. Also, a radical transfer of a vinyl monomer using a chain transfer agent having a dissociable group (or a substituent that can be derived to a dissociable group), a polymerization initiator, and an iniferter, and the dissociable group in either the initiator or the terminator. A vinyl polymer in which a dissociable group is introduced at the end of a polymer chain by ionic polymerization using a compound having (or a substituent that can be derived from a dissociable group) can also be used.
  • preferable examples of the condensation polymer and the monomer constituting the condensation polymer include those described in JP-A-2001-247787.
  • the resin particles preferably contain a water-insoluble polymer containing a hydrophilic structural unit and a structural unit derived from an aromatic group-containing monomer or a cyclic aliphatic group-containing monomer from the viewpoint of dispersion stability.
  • the “hydrophilic structural unit” is not particularly limited as long as it is a structural unit derived from a hydrophilic group-containing monomer, and may be a structural unit derived from one type of hydrophilic group-containing monomer. It may be a structural unit derived from a hydrophilic group-containing monomer.
  • the hydrophilic group is not particularly limited except for a sulfo group, and may be a dissociable group or a nonionic hydrophilic group.
  • the hydrophilic group is preferably a dissociable group, more preferably an anionic dissociative group, from the viewpoint of stability of the formed emulsified or dispersed state. That is, the resin particles are preferably resin particles having an anionic dissociation group. Examples of the dissociable group include a carboxy group and a phosphoric acid group, and among them, a carboxy group is preferable from the viewpoint of fixability when an ink composition is formed.
  • the hydrophilic group-containing monomer is preferably a dissociable group-containing monomer from the viewpoint of dispersion stability and aggregability, and is preferably a dissociable group-containing monomer having a dissociable group and an ethylenically unsaturated bond.
  • examples of the dissociable group-containing monomer include an unsaturated carboxylic acid monomer and an unsaturated phosphoric acid monomer.
  • unsaturated carboxylic acid monomer examples include acrylic acid, methacrylic acid, crotonic acid, itaconic acid, maleic acid, fumaric acid, citraconic acid, and 2-methacryloyloxymethyl succinic acid.
  • unsaturated phosphoric acid monomers include vinyl phosphonic acid, vinyl phosphate, bis (methacryloxyethyl) phosphate, diphenyl-2-acryloxyethyl phosphate, diphenyl-2-methacryloxyethyl phosphate, and dibutyl-2-acrylic. Examples thereof include oxyethyl phosphate.
  • dissociable group-containing monomers unsaturated carboxylic acid monomers are preferable and acrylic acid and methacrylic acid are more preferable from the viewpoints of dispersion stability and ejection stability.
  • the resin particles preferably contain a polymer having a carboxy group from the viewpoint of dispersion stability and aggregation rate when in contact with the pretreatment liquid, and have a carboxy group and an acid value of 25 mgKOH / g to 100 mgKOH / g. More preferably, it contains a polymer. Furthermore, the acid value is more preferably from 25 mgKOH / g to 80 mgKOH / g, particularly preferably from 30 mgKOH / g to 65 mgKOH, from the viewpoints of self-dispersibility and aggregation rate when contacting with the pretreatment liquid. In particular, when the acid value is 25 mgKOH / g or more, the dispersion stability is good, and when it is 100 mgKOH / g or less, the cohesiveness is improved.
  • the acid value can be measured by the method described above.
  • the aromatic group-containing monomer is not particularly limited as long as it is a compound containing an aromatic group and a polymerizable group.
  • the aromatic group may be a group derived from an aromatic hydrocarbon or a group derived from an aromatic heterocycle.
  • the aromatic group is preferably an aromatic group derived from an aromatic hydrocarbon from the viewpoint of particle shape stability in an aqueous medium.
  • the polymerizable group may be a polycondensable polymerizable group or an addition polymerizable polymerizable group.
  • the polymerizable group is preferably an addition polymerizable polymerizable group from the viewpoint of particle shape stability in an aqueous medium, and more preferably a group containing an ethylenically unsaturated bond.
  • the aromatic group-containing monomer is preferably a monomer having an aromatic group derived from an aromatic hydrocarbon and an ethylenically unsaturated bond.
  • the aromatic group-containing monomer may be used alone or in combination of two or more.
  • Examples of the aromatic group-containing monomer include phenoxyethyl (meth) acrylate, benzyl (meth) acrylate, phenyl (meth) acrylate, and a styrene monomer.
  • aromatic group-containing (meth) acrylate monomers are preferred from the viewpoint of the balance between the hydrophilicity and hydrophobicity of the polymer chain and the ink fixability, and include phenoxyethyl (meth) acrylate, benzyl (meth) acrylate, and phenyl (meth).
  • Acrylate is more preferable, and phenoxyethyl (meth) acrylate and benzyl (meth) acrylate are more preferable.
  • “(Meth) acrylate” means acrylate or methacrylate.
  • the cycloaliphatic group-containing monomer is preferably a monomer having a cycloaliphatic group derived from a cycloaliphatic hydrocarbon and an ethylenically unsaturated bond, and a cycloaliphatic group-containing (meth) acrylate monomer (hereinafter referred to as fat). Cyclic (meth) acrylate is sometimes preferred).
  • the alicyclic (meth) acrylate includes a component derived from (meth) acrylic acid and a component derived from alcohol, and the component derived from alcohol is unsubstituted or substituted with an alicyclic hydrocarbon. It is a compound having a structure containing at least one group (cycloaliphatic group).
  • the alicyclic hydrocarbon group may be a constituent site derived from alcohol itself, or may be bonded to a constituent site derived from alcohol via a linking group.
  • the alicyclic hydrocarbon group is not particularly limited as long as it is a hydrocarbon group containing a cyclic non-aromatic hydrocarbon group, and is a monocyclic hydrocarbon group, a bicyclic hydrocarbon group, or a tricyclic or more cyclic group.
  • a polycyclic hydrocarbon group is mentioned.
  • Examples of the alicyclic hydrocarbon group include a cycloalkyl group such as a cyclopentyl group and a cyclohexyl group, a cycloalkenyl group, a bicyclohexyl group, a norbornyl group, an isobornyl group, a dicyclopentanyl group, a dicyclopentenyl group, an adamantyl group, Examples include decahydronaphthalenyl group, perhydrofluorenyl group, tricyclo [5.2.1.0 2,6 ] decanyl group, and bicyclo [4.3.0] nonane.
  • the alicyclic hydrocarbon group may further have a substituent.
  • substituents examples include an alkyl group, alkenyl group, aryl group, aralkyl group, alkoxy group, hydroxyl group, primary amino group, secondary amino group, tertiary amino group, alkyl or arylcarbonyl group, and cyano group.
  • the alicyclic hydrocarbon group may further form a condensed ring.
  • the alicyclic hydrocarbon group preferably has 5 to 20 carbon atoms in the alicyclic hydrocarbon group portion from the viewpoint of viscosity and solubility.
  • Monocyclic (meth) acrylates include cyclopropyl (meth) acrylate, cyclobutyl (meth) acrylate, cyclopentyl (meth) acrylate, cyclohexyl (meth) acrylate, cycloheptyl (meth) acrylate, cyclooctyl (meth) acrylate, and cyclononyl.
  • Examples thereof include cycloalkyl (meth) acrylates having 3 to 10 carbon atoms in the cycloalkyl group such as (meth) acrylate and cyclodecyl (meth) acrylate.
  • Examples of the bicyclic (meth) acrylate include isobornyl (meth) acrylate and norbornyl (meth) acrylate.
  • Examples of the tricyclic (meth) acrylate include adamantyl (meth) acrylate, dicyclopentanyl (meth) acrylate, and dicyclopentenyloxyethyl (meth) acrylate. These can be used individually by 1 type or in mixture of 2 or more types, respectively.
  • alicyclic (meth) acrylate from the viewpoints of dispersion stability of resin particles, fixability, and blocking resistance, bicyclic (meth) acrylate and tricyclic or higher polycyclic (meth) ) Acrylate is preferred, and isobornyl (meth) acrylate, adamantyl (meth) acrylate, and dicyclopentanyl (meth) acrylate are more preferred.
  • the resin used for forming the resin particles is preferably an acrylic resin containing a structural unit derived from a (meth) acrylate monomer, and a structural unit derived from an aromatic group-containing (meth) acrylate monomer or alicyclic (meth) acrylate.
  • An acrylic resin containing is more preferable.
  • the resin particles preferably contain a structural unit derived from an aromatic group-containing (meth) acrylate monomer or alicyclic (meth) acrylate, and the content thereof is preferably 10% by mass to 95% by mass.
  • the content of the aromatic group-containing (meth) acrylate monomer or alicyclic (meth) acrylate is 10% by mass to 95% by mass, the stability of the emulsified or dispersed state is improved, and the ink viscosity is further increased. Can be suppressed.
  • the content of the structural unit derived from the contained (meth) acrylate monomer or alicyclic (meth) acrylate is more preferably 15% by mass to 90% by mass, and more preferably 15% by mass to 80% by mass. It is particularly preferable that the content be 25% by mass to 70% by mass.
  • the resin used for forming the resin particles can be formed using, for example, a structural unit derived from an aromatic group-containing monomer or a cyclic aliphatic group-containing monomer and a structural unit derived from a dissociable group-containing monomer. Furthermore, other structural units may be further included as necessary.
  • the monomer forming the other structural unit is not particularly limited as long as it is a monomer copolymerizable with an aromatic group-containing monomer and a dissociable group-containing monomer.
  • an alkyl group-containing monomer is preferable from the viewpoint of the flexibility of the polymer skeleton and the ease of controlling the glass transition temperature (Tg).
  • alkyl group-containing monomer examples include methyl (meth) acrylate, ethyl (meth) acrylate, isopropyl (meth) acrylate, n-propyl (meth) acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, t -Alkyl (meth) acrylates such as butyl (meth) acrylate, hexyl (meth) acrylate, ethylhexyl (meth) acrylate; hydroxymethyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate Ethylenically unsaturated monomers having a hydroxyl group such as 4-hydroxybutyl (meth) acrylate, hydroxypentyl (meth) acrylate, hydroxyhexyl (meth) acrylate; dimethylaminoethyl Dia
  • the molecular weight range of the water-insoluble polymer forming the resin particles is preferably 3,000 to 200,000, more preferably 5,000 to 150,000 in terms of weight average molecular weight, and 10,000 to 100,000. More preferably, it is 000.
  • the weight average molecular weight can be measured by the method described above.
  • the water-insoluble polymer forming the resin particles is a structural unit derived from an aromatic group-containing (meth) acrylate monomer (preferably a structural unit derived from phenoxyethyl (meth) acrylate and / or from the viewpoint of controlling the hydrophilicity / hydrophobicity of the polymer. Or a structural unit derived from benzyl (meth) acrylate) or a cycloaliphatic group-containing monomer (preferably alicyclic (meth) acrylate) as a copolymerization ratio containing 15% by mass to 80% by mass of the total mass of the resin particles. It is preferable.
  • the water-insoluble polymer has a copolymerization ratio of 15% by mass to 80% by mass of a structural unit derived from an aromatic group-containing (meth) acrylate monomer or alicyclic (meth) acrylate monomer from the viewpoint of controlling the hydrophilicity / hydrophobicity of the polymer.
  • % A structural unit derived from a carboxy group-containing monomer, and a structural unit derived from an alkyl group-containing monomer (preferably a structural unit derived from an alkyl ester of (meth) acrylic acid).
  • the water-insoluble polymer preferably has an acid value of 25 mgKOH / g to 100 mgKOH / g and a weight average molecular weight of 3,000 to 200,000, and an acid value of 25 mgKOH / g to 95 mgKOH / g.
  • the weight average molecular weight is more preferably 5,000 to 150,000. The acid value and the weight average molecular weight can be measured by the method described above.
  • exemplary compounds B-01 to B-23 are listed, but one embodiment of the present invention is not limited thereto.
  • the parenthesis represents the mass ratio of the copolymerization component.
  • B-01 Phenoxyethyl acrylate / methyl methacrylate / acrylic acid copolymer (50/45/5)
  • B-02 Phenoxyethyl acrylate / benzyl methacrylate / isobutyl methacrylate / methacrylic acid copolymer (30/35/29/6)
  • B-03 Phenoxyethyl methacrylate / isobutyl methacrylate / methacrylic acid copolymer (50/44/6)
  • B-04 Phenoxyethyl acrylate / methyl methacrylate / ethyl acrylate / acrylic acid copolymer (30/55/10/5)
  • B-05 benzyl methacrylate / isobutyl methacrylate / methacrylic acid copolymer (35/59/6)
  • B-06 Styrene / phenoxyethyl acrylate / methyl methacrylate / acrylic acid copo
  • the method for producing the water-insoluble polymer contained in the resin particles is not particularly limited.
  • a method in which emulsion polymerization is performed in the presence of a polymerizable surfactant to covalently bond the surfactant and the water-insoluble polymer examples thereof include a method in which a monomer mixture containing a hydrophilic group-containing monomer and an aromatic group-containing monomer or an alicyclic group-containing monomer is copolymerized by a known polymerization method such as a solution polymerization method or a bulk polymerization method.
  • the solution polymerization method is preferable and the solution polymerization method using an organic solvent is more preferable from the viewpoint of the aggregation rate and droplet ejection stability when the ink composition is used.
  • the resin particles include a polymer synthesized in an organic solvent from the viewpoint of aggregation rate, and the polymer has an anionic group (preferably a carboxy group), and preferably has an acid value of 20 mgKOH / g to 100 mgKOH / g. It is preferable that part or all of the anionic group (preferably carboxy group) of the polymer is neutralized and prepared as a polymer dispersion having water as a continuous phase. That is, the production of resin particles includes a step of synthesizing a polymer in an organic solvent and a dispersion step of forming an aqueous dispersion in which at least a part of an anionic group (preferably a carboxy group) of the polymer is neutralized. Is preferable.
  • the dispersion step preferably includes the following step (1) and step (2).
  • Step (1) Step of stirring a mixture containing a polymer (water-insoluble polymer), an organic solvent, a neutralizing agent, and an aqueous medium
  • Step (2) Step of removing the organic solvent from the mixture
  • Step (1) is preferably a treatment in which a polymer (water-insoluble polymer) is first dissolved in an organic solvent, then a neutralizing agent and an aqueous medium are gradually added, mixed and stirred to obtain a dispersion.
  • a neutralizing agent and an aqueous medium are gradually added, mixed and stirred to obtain a dispersion.
  • resin particles having a particle size with higher storage stability can be obtained without requiring a strong shearing force. be able to.
  • Dispersing machines such as a generally used mixing stirring apparatus and an ultrasonic disperser and a high-pressure homogenizer, can be used as needed.
  • the aqueous dispersion of resin particles is obtained by distilling the organic solvent from the dispersion obtained in the step (1) by a conventional method such as distillation under reduced pressure and inversion into an aqueous system. Obtainable.
  • the organic solvent in the obtained aqueous dispersion has been substantially removed, and the amount of the organic solvent is preferably 0.2% by mass or less, more preferably 0.1% by mass or less.
  • organic solvent examples include alcohol solvents, ketone solvents, and ether solvents.
  • organic solvents exemplified in paragraph 0059 of JP 2010-188661 A can be used.
  • the neutralizing agent the neutralizing agents exemplified in paragraphs 0060 to 0061 of JP 2010-188661 A can be used.
  • the average particle diameter of the resin particles is preferably in the range of 10 nm to 400 nm in terms of volume average particle diameter, more preferably in the range of 10 nm to 200 nm, still more preferably in the range of 10 nm to 100 nm.
  • the range of is particularly preferable.
  • Manufacturability is improved when the volume average particle diameter is 10 nm or more.
  • storage stability improves that a volume average particle diameter is 400 nm or less.
  • the particle size distribution of the resin particles is not particularly limited, and may be either resin particles having a wide particle size distribution or resin particles having a monodispersed particle size distribution. Further, two or more kinds of resin particles may be mixed and used.
  • the average particle size and particle size distribution of the resin particles are determined by measuring the volume average particle size by a dynamic light scattering method using a nanotrack particle size distribution measuring device UPA-EX150 (manufactured by Nikkiso Co., Ltd.).
  • resin particles resin particles whose shape and composition are adjusted according to the components such as the colorant contained in the ink composition may be used.
  • the carbon black pigment acts as an abrasive to cause wear and deterioration of the water-repellent film of the inkjet head.
  • a carbon black pigment acts as an abrasive to cause wear and deterioration of the water-repellent film of the inkjet head.
  • Cheap when applying a carbon black pigment as a colorant, it is preferable to contain at least one resin particle having an average particle size larger than the average secondary particle size of the carbon black pigment.
  • the average particle diameter of the resin particles of this embodiment is preferably 1.0 to 2.0 times that of the carbon black pigment from the viewpoint of suppressing the wear deterioration of the inkjet head.
  • the average particle size of the resin particles of this embodiment is preferably less than 200 nm.
  • the amount of resin particles added is preferably 0.05 to 2 times the amount of carbon black pigment added.
  • the resin particles of this embodiment self-dispersing resin particles of acrylic type, styrene acrylic type or a mixture thereof can be used.
  • Commercially available products may be used as the resin particles of this embodiment.
  • mobile vinyl 972, mobile vinyl 6520, and mobile vinyl 7110 above, manufactured by Nippon Synthetic Chemical Industry Co., Ltd.
  • Boncoat CF-6140, and Boncoat 5495EF aboveve DIC Corporation
  • Ultrazol A-25 Aika Industry Co., Ltd.
  • Asahi Kasei Latex L-3200 Asahi Kasei Chemicals Corporation
  • the resin particles of this embodiment can be used by mixing with other resin particles.
  • the ink composition may contain one kind of resin particles (preferably self-dispersing resin particles) or two or more kinds.
  • the content (total content) of the resin particles (preferably self-dispersing resin particles) in the ink composition is 1% by mass to 30% by mass with respect to the total amount of the ink composition from the viewpoint of glossiness of the image. %, Preferably 3% by mass to 15% by mass.
  • the ink composition contains water.
  • the water content is not particularly limited, but is preferably in the range of 10% by mass to 99% by mass, more preferably 30% by mass to 80% by mass, and still more preferably based on the total mass of the ink composition. 50% by mass to 80% by mass.
  • the ink composition further contains at least one organic solvent (preferably a water-soluble organic solvent).
  • a water-soluble organic solvent By containing an organic solvent, particularly a water-soluble organic solvent, drying prevention and penetration can be promoted.
  • a water-soluble organic solvent is used as an anti-drying agent, nozzle clogging that may occur due to ink drying at the ink discharge port is effectively prevented when an ink composition is ejected by an inkjet method to form an image. be able to.
  • a water-soluble organic solvent having a vapor pressure lower than that of water is preferable.
  • the water-soluble organic solvent suitable for drying prevention include ethylene glycol, propylene glycol, diethylene glycol, polyethylene glycol, thiodiglycol, dithiodiglycol, 2-methyl-1,3-propanediol, 1,2 , 6-hexanetriol, acetylene glycol derivatives, glycerol, polyhydric alcohols typified by trimethylolpropane, ethylene glycol monomethyl (or ethyl) ether, diethylene glycol monomethyl (or ethyl) ether, triethylene glycol monoethyl (or Butyl) ether and lower alkyl ethers of polyhydric alcohols such as tripropylene glycol monomethyl (or ethyl) ether, 2-pyrrolidone, N-methyl-2-pyrrolidone, 1,3-di Heterocycles such as til-2
  • water-soluble organic solvents glycerin and polyhydric alcohols such as diethylene glycol are preferable. Moreover, these may be used individually by 1 type and may use 2 or more types together. These water-soluble organic solvents are preferably contained in the ink composition in an amount of 10% by mass to 50% by mass.
  • a water-soluble organic solvent is preferably used from the viewpoint of allowing the ink composition to penetrate through the recording medium.
  • water-soluble organic solvents suitable for promoting penetration include ethanol, isopropanol, butanol, di (tri) ethylene glycol monobutyl ether, tripropylene glycol monomethyl (or ethyl) ether, and 1,2-hexanediol.
  • Alcohols, sodium lauryl sulfate, sodium oleate, and nonionic surfactants When these are contained in the ink composition in an amount of 5 to 30% by mass, good effects can be obtained.
  • these water-soluble organic solvents are preferably used within a range of addition amounts that do not cause printing or image bleeding or paper loss (print-through).
  • the water-soluble organic solvent can be used for adjusting the viscosity.
  • water-soluble organic solvents that can be used to adjust the viscosity include alcohols (eg, methanol, ethanol, propanol, isopropanol, butanol, isobutanol, sec-butanol, t-butanol, pentanol, hexanol, Cyclohexanol, benzyl alcohol), polyhydric alcohols (for example, ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol, polypropylene glycol, butylene glycol, hexanediol, pentanediol, glycerin, hexanetriol, Thiodiglycol), glycol derivatives (eg, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether) Ter, ethylene glycol monobuty
  • the ink composition may contain at least one surfactant.
  • the surfactant include a nonionic surfactant, a cationic surfactant, an anionic surfactant, and a betaine surfactant. From the viewpoint of the aggregation rate, an anionic surfactant or a nonionic surfactant is preferred.
  • the surfactant is preferably contained in the ink composition in such an amount that the surface tension of the ink composition can be adjusted to 25 mN / m or more and 40 mN / m or less from the viewpoint of satisfactorily ejecting the ink composition by the inkjet method. .
  • the content of the surfactant is preferably an amount capable of adjusting the surface tension to 27 mN / m to 37 mN / m.
  • surfactants can also be used as an antifoaming agent.
  • a fluorine compound, a silicone compound, a chelating agent represented by ethylenediaminetetraacetic acid (EDTA), and the like can also be used.
  • the ink composition can further contain other additives in addition to the above components.
  • Other additives include, for example, antifading agents, emulsion stabilizers, penetration enhancers, ultraviolet absorbers, antiseptics, antifungal agents, pH adjusters, antifoaming agents, viscosity modifiers, dispersion stabilizers, and rust inhibitors.
  • Known additives such as agents and chelating agents are included. These various additives may be added directly after the ink composition is prepared, or may be added when the ink composition is prepared.
  • a neutralizer organic base, inorganic alkali
  • the pH adjuster is preferably added to the ink composition so that the pH of the ink composition is 6 to 10, and the pH is 7 to 10. It is more preferable to add to.
  • the viscosity of the ink composition is preferably in the range of 1 mPa ⁇ s to 30 mPa ⁇ s, from the viewpoint of ejection stability when ejected by the ink jet method and the aggregation rate when a pretreatment liquid described later is used.
  • the range of ⁇ 20 mPa ⁇ s is more preferred, the range of 2 mPa ⁇ s to 15 mPa ⁇ s is still more preferred, and the range of 2 mPa ⁇ s to 10 mPa ⁇ s is particularly preferred.
  • the viscosity is measured using a VISCOMETER TV-22 (manufactured by TOKI SANGYO CO. LTD) under the condition of 25 ° C.
  • the ink composition includes a pigment coated with a polymer dispersant having a carboxy group and resin particles, the solid content is 7% by mass to 10% by mass, and the content ratio of the solid content other than the pigment to the pigment Is preferably 0.8 to 1.6, includes a pigment coated with an acrylic polymer and self-dispersing resin particles, and has a solid content of 7% by mass to 9% by mass, More preferably, the content ratio of solids other than the pigment is 1.0 to 1.4.
  • ⁇ Post-treatment liquid As the post-treatment liquid, a known coating agent applied for the purpose of protecting the image, expressing the finished texture such as glossiness or matte feeling may be used.
  • a commercially available product may be used, and examples thereof include “HYDLTH 2012 R-1 (commercially available as an aqueous coating varnish)” manufactured by DIC Graphics Corporation.
  • a post-treatment liquid containing an acrylic resin emulsion can be used.
  • Examples include “Aqua Pack Varnish F-1” and “Aqua Pack Varnish F-2” manufactured by TOKA.
  • the ink composition and pretreatment liquid used in the image forming method of the present disclosure may be an ink set having a one-color configuration or a multicolor configuration including one or two or more ink compositions and a pretreatment liquid.
  • the ink set of the present disclosure is not particularly limited as long as it includes a combination of at least one ink composition of the present disclosure and the pretreatment liquid of the present disclosure.
  • the content ratio of the colorant in the ink composition to the content of the cohesive compound in the total mass of the pretreatment liquid is not particularly limited, but is preferably 0.1 to 50, preferably 0.15 on a mass basis. To 10 is more preferable, and 0.25 to 5 is more preferable. When the content ratio is 50 or less, the roughness of the image can be suppressed, and when it is 0.1 or more, the abrasion resistance of the image is improved.
  • Color composition black ink as an ink composition, cyan ink as an ink composition, cyan ink as an ink composition, magenta ink as an ink composition, yellow ink as an ink composition,
  • the structure (4 color structure) which consists of a combination with a process liquid is mentioned.
  • the ink set may be a one-color configuration or a two-color configuration ink set including one or two types of ink compositions and a pretreatment liquid as necessary.
  • the ink set may include other ink compositions such as at least one ink selected from light cyan ink, light magenta ink, and light yellow ink as necessary. Good.
  • known ink compositions can be used without any particular limitation.
  • the ink set may contain two or more kinds of pretreatment liquids as necessary.
  • the volume average particle diameter of the water-insoluble resin particle A1 is a nano-track particle size distribution measuring apparatus UPA at a liquid temperature of 25 ° C. using an aqueous dispersion of the water-insoluble resin particle A1 adjusted so that the solid content concentration is 2% by mass.
  • the volume average particle diameter was measured by dynamic light scattering using EX150 (manufactured by Nikkiso Co., Ltd.).
  • the volume average particle diameter of water-insoluble resin particles A2 to A4 described later was also determined by measuring the volume average particle diameter in the same manner as for water-insoluble resin particles A1.
  • the aqueous dispersion of water-insoluble resin particles A2 was obtained in the same manner as the water-insoluble resin particles A1, except that the solution B2 was dropped simultaneously over 3 hours.
  • the volume average particle diameter of the water-insoluble resin particles A2 was 150 nm.
  • An aqueous dispersion of water-insoluble resin particles A3 was obtained in the same manner as the water-insoluble resin particles A1, except that the solution B3 was dropped simultaneously over 3 hours.
  • the volume average particle diameter of the water-insoluble resin particles A3 was 500 nm.
  • the aqueous dispersion of water-insoluble resin particles A3 was obtained in the same manner as the water-insoluble resin particles A1, except that the solution B was dropped simultaneously over 3 hours.
  • the volume average particle diameter of the water-insoluble resin particles A4 was 600 nm.
  • Preparation of pretreatment liquid Each component was mixed so that it might become the following composition, and the processing liquid 1 was prepared.
  • -Composition of treatment liquid 1- Propylene glycol: amount shown in Table 2 (water-soluble organic solvent, SP value 25.98) Malonic acid: 17.3% by mass (Compounds that aggregate colorants, organic acidic compounds) Propanetricarboxylic acid: 4.3% by mass (Compounds that aggregate colorants, organic acidic compounds) Phosphoric acid 4.3% by mass (Compounds that aggregate colorants, inorganic acidic compounds)
  • Water-insoluble resin particles types and contents as shown in Table 2, 1,2,4-triazole: 0.7% by mass
  • Antifoaming agent 100ppm as the amount of silicone oil (BYK-038 manufactured by Big Chemie Japan Co., Ltd. (solid content: 100% by mass), emulsion-type silicone antifoaming agent) Ion-exchanged water: remaining amount of 100% by mass in total
  • treatment liquid 2 to treatment liquid 19 The treatment liquid 2 to the treatment liquid are the same as the treatment liquid 1 except that the type and content of the water-insoluble resin particles and the kind and content of the water-soluble organic solvent are changed as shown in Table 2. 19 was prepared.
  • a 50 ml centrifuge tube was further removed using a high-speed centrifugal cooler 7550 (manufactured by Kubota Corporation). Used and centrifuged at 8000 rpm for 30 minutes. After the stretching treatment, the supernatant liquid other than the precipitate was collected. Thereafter, the pigment concentration was determined from the absorbance spectrum, and a dispersion (cyan dispersion C) of resin-coated pigment particles (pigment coated with a polymer dispersant) having a pigment concentration of 10.2% by mass was obtained. The average particle diameter of the resin-coated pigment particles of the obtained Cyan Dispersion C was 105 nm. The average particle size was measured by the method described above.
  • magenta dispersion M In the preparation of the cyan dispersion, the preparation of the cyan dispersion was carried out except that Pigment Red 122, which is a magenta pigment, was used instead of Pigment Blue 15: 3 (Phthalocyanine-A220, manufactured by Dainichi Seika Co., Ltd.) Similarly, a dispersion (magenta dispersion M) of resin-coated pigment particles (pigment coated with a polymer dispersant) was prepared. The average particle diameter of the resin-coated pigment particles of the obtained magenta dispersion M was 85 nm. The average particle size was measured by the method described above.
  • black dispersion K- In the preparation of the cyan dispersion, carbon black (NIPEX 160-IQ, manufactured by Orion Engineered Carbons), which is a black pigment, is used instead of Pigment Blue 15: 3 (Phthalocyanine-A220, manufactured by Dainichi Seika Co., Ltd.)
  • a dispersion (black dispersion K) of resin-coated pigment particles (pigment coated with a polymer dispersant) was prepared in the same manner except that was used.
  • the average particle diameter of the resin-coated pigment particles of the obtained black dispersion K was 130 nm. The average particle size was measured by the method described above.
  • Table 1 The numerical values in Table 1 represent the content (parts by mass) of each component contained in the ink composition. In Table 1, “-” in the content of each component indicates that the corresponding component is not contained. The details of each trade name in Table 1 are as follows. ⁇ Sanix GP-250: Organic solvent manufactured by Sanyo Chemical Industries, Ltd. ⁇ Orphine E1010: Nonionic surfactant manufactured by Nissin Chemical Industry Co., Ltd.
  • Each prepared ink composition is filtered with a plastic disposable syringe through a polyvinylidene fluoride (PVDF) 5 ⁇ m filter (Millipore Millex SV, diameter 25 mm), and finished ink 1 (magenta ink M1, black ink K1, cyan ink) C1, yellow ink Y1).
  • PVDF polyvinylidene fluoride
  • ink 2 (Preparation of ink 2)
  • the black ink composition K1 is changed to the black ink composition K2 prepared below, and the magenta ink composition M1, the black ink composition K2, the cyan ink composition C1, and the yellow ink composition Y1.
  • a completed ink 2 was prepared.
  • Orphine E1020 (manufactured by Nissin Chemical Industry Co., Ltd., surfactant) ... 1.0% by mass Resin particle B (self-dispersing resin particle P-1 synthesized as follows) ... 7.5% by mass ⁇ Resin particles C (Moni Brewery 972, manufactured by Nippon Synthetic Chemical Industry Co., Ltd.) ... 1.0% by mass ⁇ PVP K-15 (manufactured by ISB Japan) ... 0.2% by mass ⁇ Urea: 5.0% by mass ⁇ Cerosol 524 (manufactured by Chukyo Yushi Co., Ltd.): 1.5% by mass ⁇ Snowtex XS (Nissan Chemical Co., Ltd., colloidal silica) ...
  • HYDLITH 2012 R-1 manufactured by DIC Graphics, Inc., marketed as an aqueous coating varnish
  • ⁇ Preparation of recording medium> The following coated papers were prepared as recording media for image formation. ⁇ New DV (Hokuetsu Kishu Paper Co., Ltd.) ⁇ Kondo (manufactured by BUCHMANN KARTON) ⁇ OKT mat (Oji Paper Co., Ltd.) ⁇ UF coat (Oji Materia Co., Ltd.)
  • the pretreatment liquid applied on the recording medium was dried under the following conditions. ⁇ Drying conditions (fan drying) ⁇ Wind speed: 15m / s Temperature and heating method: contact type flat surface from the back side of the recording medium (side on which the pretreatment liquid is not applied) so that the surface temperature of the recording medium (temperature on the side to which the pretreatment liquid is applied) is 60 ° C. Heated with a heater. Air blowing area: 450 mm (drying time 0.7 seconds)
  • Image formation process Four-color single-pass image formation was performed on the recording medium provided with the treatment liquid under the following conditions. Specifically, an image was formed by applying (dropping) ink of each color on the processing liquid of the recording medium to which the processing liquid was applied under the following conditions. Head: A head in which 1,200 dpi (dot per inch) / 20 inch width piezo full line heads were arranged for four colors was used. Discharged droplet amount: 2.4 pL. Drive frequency: 30 kHz (recording medium conveyance speed 635 mm / sec).
  • the ink applied on the recording medium was dried under the following conditions.
  • -Drying conditions for ink (blow drying)
  • Wind speed 15m / s
  • Temperature The recording medium was heated with a contact type flat heater from the back surface (the surface to which ink was not applied) so that the surface temperature of the recording medium (the temperature to which ink was applied) was 60 ° C.
  • Air blowing area 640 mm (drying time 1 second)
  • Heat fixing process The image formed by applying the ink was heat-fixed using a silicon rubber roller (hardness 50 °, nip width 5 mm) under the following conditions. -Heat fixing conditions- Roller temperature: 90 ° C Pressure: 0.8 MPa
  • Post-processing process After finishing the heating and fixing step, a post-treatment liquid is applied to the entire image forming surface of the recording medium on which the image is formed by using Digi Coater POD (manufactured by Toyotec Co., Ltd., roller coater). As a result, post-processing was performed on the image forming surface of the recording medium to prepare an image sample. The post-treatment was performed by coating the post-treatment liquid on the image forming surface of the substrate with a coating amount of 4.0 g / m 2.
  • the post-treatment liquid applied to the image forming surface of the recording medium was dried under the following conditions.
  • evaluation criteria if it is A or B, it is within a practically acceptable range.
  • Example 8 Example 11 and Example 12 according to the image forming method of the example, the image with respect to various recording media in which the surface roughness Ra 1 satisfies the formula (1) is obtained. It can be seen that image formation excellent in suppression of occurrence of roughness can be performed.
  • Example 2 From the results of Example 2, Example 4, and Example 17, it can be seen that if the SP value is 22 MPa 1/2 or more, both the suppression of the occurrence of image roughness and the stability of the processing solution are excellent. From the results of Example 5, Example 6, Example 7, and Example 15, when the volume average particle diameter of the water-insoluble resin particles contained in the pretreatment liquid is in the range of 10 nm to 500 nm, the image is rough. It turns out that it is excellent by both suppression of generation

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Ink Jet (AREA)
  • Ink Jet Recording Methods And Recording Media Thereof (AREA)
  • Inks, Pencil-Leads, Or Crayons (AREA)

Abstract

La présente invention concerne un procédé de formation d'image qui comprend : une étape d'application d'un liquide de prétraitement contenant un composé pour floculer un agent colorant dans une composition d'encre et des particules de résine insolubles dans l'eau dont la teneur Z par rapport à la masse totale du liquide de prétraitement satisfait à la formule (3) : 10 % en masse ≤ la teneur Z ≤ 20 % en masse sur un support d'enregistrement ayant une surface avec une rugosité moyenne arithmétique Ra1 de cette dernière satisfaisant à la formule (1) : 2,6 μm ≤ Ra1 pour former une surface d'application de liquide de traitement avec une rugosité moyenne arithmétique Ra22 de cette dernière satisfaisant à la formule (2) : Ra2 ≤ 2,6 µm ; et une étape d'application de la composition d'encre contenant l'agent colorant et de l'eau sur la surface d'application de liquide de traitement du support d'enregistrement selon un procédé de jet d'encre.
PCT/JP2018/013904 2017-03-31 2018-03-30 Procédé de formation d'image WO2018181992A1 (fr)

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JP2017071852A JP2020093389A (ja) 2017-03-31 2017-03-31 画像形成方法

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JPWO2020202773A1 (fr) * 2019-03-29 2020-10-08
JPWO2021140772A1 (fr) * 2020-01-10 2021-07-15
JPWO2021187000A1 (fr) * 2020-03-19 2021-09-23
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JP7354413B2 (ja) 2020-03-19 2023-10-02 富士フイルム株式会社 非浸透性基材用前処理液、及び画像記録方法

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