JP2016168782A - Process liquid for inkjet, process liquid cartridge for inkjet, ink set for inkjet, ink cartridge set for inkjet, recording device, and recording method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a process liquid for inkjet that achieves recording of an image with a narrow line width even for a recording medium with high ink permeability.SOLUTION: A process liquid for inkjet comprises a colorant flocculant, polyolefin particles, water, and aqueous organic solvent.SELECTED DRAWING: None

Description

  The present invention relates to an inkjet processing liquid, an inkjet processing liquid cartridge, an inkjet ink set, an inkjet ink cartridge set, a recording apparatus, and a recording method.

  An ink jet system that discharges ink from an ink discharge port formed by a nozzle, a slit, a porous film, and the like is used in many printers because it is small and inexpensive.

  For example, Patent Document 1 discloses that “an ink composition containing a colorant, resin particles, a water-soluble organic solvent, and water; an aggregating agent that aggregates the components in the ink composition; and the components in the ink composition. And a treatment liquid containing a water-soluble polymer that does not cause aggregation. ”. Patent Document 1 discloses an acid as a flocculant.

  Patent Document 2 discloses “an ink composition for ink-jet printing, which contains a color pigment, a polymer dispersant, a binder component, an aqueous medium, and a polyalkylsiloxane emulsion wax.” Patent Document 2 also discloses “a treatment liquid containing a polyvalent metal salt and an acrylic polymer emulsion”.

  In Patent Document 3, “consisting of at least a first liquid and a second liquid, the first liquid contains at least a coloring material, a water-soluble solvent, a polymer substance, and water, and the second liquid is An ink jet ink set containing at least a flocculant, a water-soluble solvent, and water is disclosed. Patent Document 3 discloses organic acids, inorganic salts, and organic amines as flocculants.

JP 2010-23339 A JP 2011-105915 A JP 2005-213488 A

  An object of the present invention is to provide an image having a narrow line width even on a recording medium having a high ink permeability as compared with a system containing a colorant flocculant, water, and an aqueous organic solvent, and further containing no polyolefin particles. It is to provide an inkjet processing liquid that realizes the above recording.

  The above problem is solved by the following means.

The invention according to claim 1
An inkjet processing solution comprising a colorant flocculant, polyolefin particles, water, and an aqueous organic solvent.

The invention according to claim 2
The inkjet treatment liquid according to claim 1, wherein the polyolefin particles are polypropylene particles.

The invention according to claim 3
The inkjet processing liquid according to claim 1, wherein the color material flocculant is at least one selected from the group consisting of organic acids and salts of organic acids.

The invention according to claim 4
An inkjet treatment liquid cartridge containing an inkjet treatment liquid containing a colorant flocculant, polyolefin particles, water, and an aqueous organic solvent.

The invention according to claim 5
An ink-jet ink comprising a colorant, water, and an aqueous organic solvent;
The processing liquid for inkjets of any one of Claims 1-3,
An ink-jet ink set comprising:

The invention according to claim 6
An ink-jet ink cartridge containing ink-jet ink containing a coloring material, water, and an aqueous organic solvent;
An ink jet processing liquid cartridge containing the ink jet processing liquid according to any one of claims 1 to 3,
An ink-jet ink cartridge set comprising:

The invention according to claim 7 provides:
A discharge device that contains the inkjet ink set according to claim 5 and that discharges the inkjet ink and the inkjet processing liquid onto a surface of a recording medium,
A recording apparatus that records an image by ejecting the ink-jet ink and the ink-jet processing liquid from the ejection apparatus so as to contact each other on the surface of the recording medium.

The invention according to claim 8 provides:
A recording method for recording an image by ejecting the ink-jet ink and the ink-jet processing liquid in contact with each other on the surface of a recording medium using the ink-jet ink set according to claim 5.

According to the first aspect of the present invention, a line containing a colorant flocculant, water, and an aqueous organic solvent is further applied to a recording medium having a high ink permeability as compared with a case where no polyolefin particles are contained. An inkjet processing liquid that realizes recording of a narrow image is provided.
According to the second aspect of the invention, compared to the case where the polyolefin particles are polyethylene particles or polybutene particles, an inkjet processing liquid that realizes recording of an image having a narrow line width even on a recording medium having high ink permeability. Is provided.
According to the invention of claim 3, as compared with the case where the color material flocculant is an inorganic acid or a monovalent metal salt of an inorganic acid, an image having a narrow line width can be recorded even on a recording medium having high ink permeability. An inkjet processing solution that achieves the above is provided.

  According to the invention according to claim 4, 5, 6, 7, 8, or 9, the inkjet treatment liquid that does not contain polyolefin particles is further applied to a system that includes a colorant flocculant, water, and an aqueous organic solvent. Ink jet treatment liquid cartridge, ink jet ink set, ink jet ink cartridge set, recording apparatus, and recording method for recording an image with a narrow line width even on a recording medium having a high ink permeability compared to the above case Is provided.

1 is a schematic configuration diagram illustrating a recording apparatus according to an embodiment. FIG. 4 is a partial plan view showing the periphery of the ejection device in the recording apparatus according to the embodiment.

  Embodiments that are examples of the present invention will be described below.

<Inkjet treatment liquid>
The inkjet processing liquid according to this embodiment (hereinafter, also simply referred to as “processing liquid”) includes a color material flocculant, polyolefin particles, water, and an aqueous organic solvent. The treatment liquid may contain other additives as necessary.
The treatment liquid is a treatment liquid that is used together with an inkjet ink (hereinafter also simply referred to as “ink”) containing a coloring material, water, and an aqueous organic solvent, and records an image by an inkjet recording method.

With the above configuration, the processing liquid according to the present embodiment realizes recording of an image with a narrow line width even on a recording medium with high ink permeability. The reason is presumed as follows.
In addition, a recording medium with high ink permeability is a recording medium in which the maximum liquid absorption amount of ink exceeds 15 ml / m ² within a contact time of 500 ms as measured by a dynamic scanning absorption meter, for example.

First, as an ink jet recording method, a recording method for recording an image using an ink by using a treatment liquid containing a colorant flocculant together with ink is known. In this recording method, the color material flocculant in the treatment liquid promotes the aggregation of the color material contained in the ink and suppresses the diffusion of the color material into the recording medium (paper). Thereby, blurring of the image is suppressed.
However, when recording an image on a recording medium having high ink permeability (for example, book paper such as a book or a magazine), image blurring by the color material aggregating agent is not sufficient, and an image with a narrow line width is not used. When recording is attempted, a phenomenon may occur in which the line width of the image widens. Specifically, for example, if a character image of a small point is recorded, the character image may be crushed and the legibility may be degraded. This is because the color material aggregated by the color material flocculant diffuses on the surface layer of the recording medium through the gap between the fibers of the recording medium having high ink permeability.

  On the other hand, polyolefin particles are further included in the treatment liquid containing water, an aqueous organic solvent, and a colorant flocculant. When the treatment liquid is applied to the recording medium, the polyolefin particles are caught in the gaps between the fibers of the recording medium (paper) in the surface layer of the recording medium, and easily accumulate in the surface layer of the recording medium in a state in which the gaps are embedded. It has properties and is considered to narrow the size of the gap between fibers in a pseudo manner. For this reason, when an image is recorded on a recording medium having high ink permeability, the color material aggregated by the color material coagulant is prevented from diffusing on the surface layer of the recording medium through the gaps between the fibers of the recording medium. It is thought.

  In addition, a technique for including a water-soluble polymer in the treatment liquid is known. However, since the water-soluble polymer is in a dissolved state in water, it is difficult to get caught in the gap between the fibers of the recording medium, so it is considered that the water-soluble polymer is not buried in the gap and is not easily accumulated on the surface layer of the recording medium. In addition, even if the water-soluble polymer adheres in a state where it is embedded in the voids between the fibers of the recording medium, it is re-dissolved by the water contained in the ink, enters into the ink, and hardly remains on the surface layer of the recording medium. it is conceivable that. For this reason, it is considered that the suppression of the diffusion of the color material aggregated by the color material coagulant is hardly exhibited by the technique of including a water-soluble polymer in the treatment liquid.

  In addition, a technique for including acrylic resin particles in the treatment liquid is also known. However, the acrylic resin particles are not embedded in the gaps between the fibers of the recording medium due to the interaction with the material of the recording medium (paper) and the characteristics of the acrylic resin itself, compared to the polyolefin particles, and on the surface layer of the recording medium. It is considered difficult to accumulate. Further, since the acrylic resin particles are made of a resin having the same structure as the acrylic dispersant known as a color material dispersant, the dispersion of the color material is promoted and the aggregation of the color material by the color material flocculant is prevented. It is thought to work. For this reason, it is considered that the suppression of the diffusion of the color material aggregated by the color material coagulant is hardly exhibited by the technique of including acrylic resin particles in the treatment liquid.

From the above, it is presumed that the processing liquid according to the present embodiment realizes recording of an image having a narrow line width even on a recording medium having high ink permeability.
And in the processing liquid which concerns on this embodiment, the crushing of the character image of a small point is suppressed, for example, and the legibility of a character image is improved.

  Hereinafter, each component of the processing liquid which concerns on this embodiment is demonstrated in detail.

(Coloring material flocculant)
The color material aggregating agent is a substance having an effect of causing aggregation of the color material by reacting or interacting with the color material in the ink. Examples of the color material flocculant include polyvalent metal ions and cationic substances.
Examples of the color material flocculant include organic acids or salts thereof, inorganic electrolytes, and organic amine compounds. Among these, the colorant flocculant is at least selected from the group consisting of an organic acid and a salt of an organic acid, from the viewpoint of realizing the recording of an image with a narrow line width and the storage stability of the treatment liquid. One type is preferable. The organic acid or salt thereof has an acid dissociation constant pKa of 4.5 or less (preferably 4.2 or less, more preferably 1.0 or more and 4.0 or less) from the viewpoint of realizing recording of an image having a narrow line width. ) Organic acid or a salt thereof.

  Examples of the organic acid or a salt thereof include compounds having a carboxyl group or a carboxyl group in which a carboxyl group or a salt structure is formed on a heterocyclic ring (saturated or unsaturated heterocyclic ring). Specifically, examples of the organic acid or a salt thereof include compounds represented by the following general formula (FL).

In General Formula (FL), X is an atom that forms a heterocyclic ring with “C”, and represents O, CO, NH, NR ¹ , S, or SO ₂ . R ¹ represents a substituted or unsubstituted alkyl group. Examples of the substituent of the alkyl group include a hydroxyl group. R ¹ is preferably CH ₃ , C ₂ H ₅ , or C ₂ H ₄ OH. X is preferably CO, NH, NR ¹ , or O, and more preferably CO, NH, or O.
R represents a substituted or unsubstituted alkyl group. Examples of the substituent of the alkyl group include a hydroxyl group. R is preferably CH ₃ , C ₂ H ₅ , or C ₂ H ₄ OH.
M represents a hydrogen atom, an alkali metal, or an amine. M is preferably a hydrogen atom, Li, Na, K, monoethanolamine, diethanolamine, triethanolamine or the like, more preferably H, Na, or K, and more preferably a hydrogen atom.
n represents an integer of 3 to 7. n is preferably an integer such that the heterocyclic ring formed by “X” and “C” is a 6-membered ring or a 5-membered ring, and more preferably an integer that is a 5-membered ring. m represents an integer of 1 or 2.
k represents an integer of 1 or 2. l represents an integer of 1 to 5.
The heterocyclic ring formed by “X” and “C” may be a saturated ring or an unsaturated ring.

  Examples of the organic acid or a salt thereof include a furan structure, a pyrrole structure, a pyrroline structure, a pyrrolidone structure, a pyrone structure, a pyrrole structure, a thiophene structure, an indole structure, a pyridine structure, or a quinoline structure, and a carboxyl group as a functional group. Or the compound which has the carboxyl group in which the salt structure was formed is mentioned. Specific examples of the organic acid or a salt thereof include, for example, 2-pyrrolidone-5-carboxylic acid, 4-methyl-4-pentanolide-3-carboxylic acid, furan carboxylic acid, 2-benzofuran carboxylic acid, and 5-methyl-2. Furancarboxylic acid, 2,5-dimethyl-3-furancarboxylic acid, 2,5-furandicarboxylic acid, 4-butanolide-3-carboxylic acid, 3-hydroxy-4-pyrone-2,6-dicarboxylic acid, 2 -Pyrone-6-carboxylic acid, 4-pyrone-2-carboxylic acid, 5-hydroxy-4-pyrone-5-carboxylic acid, 4-pyrone-2,6-dicarboxylic acid, 3-hydroxy-4-pyrone-2 , 6-dicarboxylic acid, thiophenecarboxylic acid, 2-pyrrolecarboxylic acid, 2,3-dimethylpyrrole-4-carboxylic acid, 2,4,5-trimethylpyrrole-3-propio Acid, 3-hydroxy-2-indolecarboxylic acid, 2,5-dioxo-4-methyl-3-pyrroline-3-propionic acid, 2-pyrrolidinecarboxylic acid, 4-hydroxyproline, 1-methylpyrrolidine-2-carboxylic acid Acid, 5-carboxy-1-methylpyrrolidine-2-acetic acid, 2-pyridinecarboxylic acid, 3-pyridinecarboxylic acid, 4-pyridinecarboxylic acid, pyridinedicarboxylic acid, pyridinetricarboxylic acid, pyridinepentacarboxylic acid, 1,2, 5,6-tetrahydro-1-methylnicotinic acid, 2-quinolinecarboxylic acid, 4-quinolinecarboxylic acid, 2-phenyl-4-quinolinecarboxylic acid, 4-hydroxy-2-quinolinecarboxylic acid, 6-methoxy-4- Examples include quinolinecarboxylic acid, derivatives of these compounds, or salts thereof.

  Examples of organic acids or salts thereof include 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 salts thereof. Pyrrolidone carboxylic acid, pyrone carboxylic acid, furan carboxylic acid, coumaric acid, or a compound derivative thereof, or a salt thereof is more preferable.

  Organic acids or salts thereof include arginic acid, citric acid, glycine acid, glutamic acid, succinic acid, tartaric acid, cysteine, oxalic acid, fumaric acid, phthalic acid, maleic acid, malonic acid, lysine, malic acid, or salts thereof And so on.

  In addition, as an inorganic acid or its salt, phosphoric acid, hydrochloric acid, nitric acid, a sulfuric acid, perchloric acid, carbonic acid, or these salts etc. are mentioned.

  In addition, a color material flocculant may be used individually by 1 type, and may be used together 2 or more.

  The content of the color material flocculant is preferably 0.01% by mass or more and 30% by mass or less, more preferably 0.1% by mass or more and 15% by mass or less, based on the total mass of the treatment liquid, and 0.25. More preferably, the content is from 10% by mass to 10% by mass.

(Polyolefin particles)
The polyolefin particles are olefin polymer particles. The polyolefin particles may be homopolymer particles obtained by polymerizing one kind of olefin, or may be copolymer particles obtained by copolymerizing two or more kinds of olefins.

Examples of olefins include linear or branched aliphatic olefins and alicyclic olefins.
Examples of the linear or branched aliphatic olefin include aliphatic olefins having 2 to 30 carbon atoms (preferably 2 to 18 carbon atoms). Specifically, examples of the aliphatic olefin include ethylene, propylene, 1-butene, 1-hexene, 4-methyl-1-pentene, 1-octene, 1-decene, 1-hexadecene and 1-octadecene. An α-olefin may be mentioned.
Examples of the alicyclic olefin include alicyclic olefins having 4 to 20 carbon atoms (preferably 4 to 12 carbon atoms). Specifically, examples of the alicyclic olefin include cyclopentene, cycloheptene, norbornene, 5-methyl-2-norbornene, tetracyclododecene, vinylcyclohexane, and the like.
In addition, an olefin may be used individually by 1 type and may be used together 2 or more.

  Among these, as the polyolefin particles, polyolefin particles containing at least an olefin having 3 to 6 carbon atoms (preferably 4 to 6 carbon atoms) as a polymerization component are preferable from the viewpoint of realizing recording of a narrow line width image. Polypropylene particles are more preferred.

The polyolefin particles may be dispersed in the treatment liquid using an emulsifier, or may be dispersed in the treatment liquid without using an emulsifier. As an emulsifier, a polymer having a hydrophilic group such as a surfactant, a sulfonic acid group, or a carboxyl group (for example, a polymer having a hydrophilic group grafted thereto, a hydrophilic monomer and a hydrophobic portion) Polymers obtained from monomers).
The polyolefin particles are preferably blended into the treatment liquid using an aqueous dispersion (emulsion) in which the polyolefin particles are previously dispersed.

  The polyolefin weight average molecular weight (hereinafter also referred to as “Mw”) of the polyolefin particles is preferably 1000 or more and 100000000 or less, and more preferably 2000 or more and 50000000 or less, from the viewpoint of realizing recording of an image having a narrow line width.

  The weight average molecular weight of the polyolefin is measured by gel permeation chromatography (GPC) under the following conditions. GPC uses “HLC-8120GPC, SC-8020 (manufactured by Tosoh Corporation)”, and the column uses two “TSKgel, SuperHM-H (6.0 mm ID × 15 cm, manufactured by Tosoh Corporation)” THF (tetrahydrofuran) is used as the eluent. The measurement conditions were a sample concentration of 0.5% and a flow rate of 0.6 ml / min. Sample injection volume 10 μl, measurement temperature 40 ° C., using RI detector. The calibration curve is “polystylen standard sample TSK standard” manufactured by Tosoh Corporation: “A-500”, “F-1”, “F-10”, “F-80”, “F-380”, “A-2500”. ”,“ F-4 ”,“ F-40 ”,“ F-128 ”, and“ F-700 ”.

The volume average particle size (hereinafter also referred to as “D50v”) of the polyolefin particles is preferably 50 nm or more and 400 nm or less, more preferably 70 nm or more and 300 nm or less, from the viewpoint of realizing recording of an image having a narrow line width.
The volume average particle diameter of the polyolefin particles is measured with a Microtrac UPA particle size analyzer UPA-UT151 (manufactured by Microtrac). The measurement is performed by putting the treatment liquid diluted 1000 times into the measurement cell. As the input value at the time of measurement, the viscosity is the viscosity of a diluent for diluting the treatment liquid, and the particle refractive index is the refractive index of polyolefin particles.

  In addition, polyolefin particle | grains may be used individually by 1 type, and may be used together 2 or more.

  The content of the polyolefin particles is preferably 2% by mass or more and 30% by mass or less, and more preferably 4% by mass or more and 20% by mass or less with respect to the total mass of the treatment liquid, from the viewpoint of realizing recording of an image having a narrow line width. preferable.

(water)
As water, ion-exchanged water, ultrapure water, distilled water, and ultrafiltered water are particularly preferable from the viewpoint of preventing contamination of impurities or generation of microorganisms.

  For example, the content of water is preferably 10% by mass to 95% by mass, and more preferably 30% by mass to 90% by mass with respect to the total mass of the treatment liquid.

(Water-soluble organic solvent)
The water-soluble organic solvent will be described.
Examples of the water-soluble organic solvent include polyhydric alcohols, polyhydric alcohol derivatives, nitrogen-containing solvents, alcohols, and sulfur-containing solvents. Other examples of the water-soluble organic solvent include propylene carbonate and ethylene carbonate.

  Polyhydric alcohols include ethylene glycol, diethylene glycol, propylene glycol, butylene glycol, triethylene glycol, 1,5-pentanediol, 1,2-hexanediol, 1,2,6-hexanetriol, glycerin, trimethylol Sugar alcohols such as propane and xylitol; sugars such as xylose, glucose and galactose;

  Polyhydric alcohol derivatives include ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, propylene glycol monobutyl ether, dipropylene glycol monobutyl ether, diglycerin. And ethylene oxide adducts.

Examples of the nitrogen-containing solvent include pyrrolidone, N-methyl-2-pyrrolidone, cyclohexyl pyrrolidone, triethanolamine and the like.
Examples of alcohols include ethanol, isopropyl alcohol, butyl alcohol, and benzyl alcohol.
Examples of the sulfur-containing solvent include thiodiethanol, thiodiglycerol, sulfolane, dimethyl sulfoxide and the like.

  The water-soluble organic solvent may be used alone or in combination of two or more.

  The content of the water-soluble organic solvent is preferably 1% by mass or more and 60% by mass or less, and more preferably 5% by mass or more and 40% by mass or less with respect to water.

(Other additives)

  Other additives include coloring materials, surfactants (anionic surfactants, nonionic surfactants, cationic surfactants, amphoteric surfactants, etc.), ejection improvers (polyethyleneimine, polyamines, polyvinyl Pyrrolidone, polyethylene glycol, ethyl cellulose, carboxymethyl cellulose, etc.), conductive agent, pH adjuster (alkali metal compounds such as potassium hydroxide, sodium hydroxide, lithium hydroxide, etc.), reactive diluent, penetrant, pH Well-known additives such as a buffer, an antioxidant, an antifungal agent, a viscosity modifier, a conductive agent, a chelating agent, an ultraviolet absorber, and an infrared absorber may be mentioned.

(Physical properties of processing solution)
The surface tension of the treatment liquid is preferably 10 mN / m or more and 45 mN / m or less, more preferably 15 mN / m or more and 40 mN / m or less, and further preferably 20 mN / m or more and 35 mN / m or less. The surface tension of the treatment liquid is preferably smaller than the surface tension of the ink.
The surface tension is measured in a 23 ° C. and 55% RH environment using a Wilhelmy surface tension meter.

The viscosity of the treatment liquid is preferably 1.2 mPa · s or more and 15 mPa · s or less, more preferably 1.5 mPa · s or more and less than 10 mPa · s, and further preferably 1.8 mPa · s or more and less than 8 mPa · s.
The viscosity is measured using TV-20 (manufactured by Toki Sangyo Co., Ltd.) as a measuring device, at a measurement temperature of 23 ° C. and a shear rate of 750 s ⁻¹ .

  The pH of the treatment liquid is preferably 1.5 or more and 12.0 or less, more preferably 2.0 or more and 7.5 or less, and further preferably 2.5 or more and 6.0 or less. .

<Inkjet ink set>
The ink-jet ink set according to the present embodiment (hereinafter also simply referred to as “ink set”) includes ink and a processing liquid according to the present embodiment.

The ink will be described.
The ink includes a coloring material, water, and an aqueous organic solvent. The ink may contain other components.

  Hereinafter, each component of the ink will be described.

(Color material)
As the color material, a material corresponding to an ink having a target hue may be used, and specifically, a pigment may be used. Examples of the pigment include organic pigments and inorganic pigments.

  Specific examples of black pigments (black pigments) include Raven7000, Raven5750, Raven5250, Raven5000 ULTRAII, Raven3500, Raven2000, Raven1500, Raven1250, Raven1200, Raven1190, Raven1190, Raven1190, Raven1190 ), Regal 400R, Regal 330R, Regal 660R, Mogu L, Black Pearls L, Monarch 700, Monarch 800, Monarch 880, Monarch 900, Monarch 1000, Monarch 1100, Monarch 1300, Mo arch 1400 (above Cabot), Color Black FW1, Color Black FW2, Color Black FW2V, Color Black 18, Color Black FW200, Color Black S150, Color Black S150, Color Black S160, Color Black S160, Color Black S160, Color Black S150, Color Black S150, Color Black S150, Color Black S150 , Printex 140V, Special Black 6, Special Black 5, Special Black 4A, Special Black 4 (manufactured by Degussa), No. 25, no. 33, no. 40, no. 47, no. 52, no. 900, no. 2300, MCF-88, MA600, MA7, MA8, MA100 (manufactured by Mitsubishi Chemical Corporation) and the like, but are not limited thereto.

Specific examples of the cyan pigment include C.I. I. Pigment Blue-1, -2, -3, -15, -15: 1, -15: 2, -15: 3, -15: 4, -16, -22, -60, and the like. It is not limited.
Specific examples of the magenta color pigment include C.I. I. Pigment Red-5, -7, -12, -48, -48: 1, -57, -112, -122, -123, -146, -168, -177, -184, -202, C.I. I. Pigment Violet-19 and the like, but are not limited thereto.
Specific examples of yellow pigments include C.I. I. Pigment Yellow-1, -2, -3, -12, -13, -14, -16, -17, -73, -74, -75, -83, -93, -95, -97, -98, -114, -128, -129, -138, -151, -154, -180, and the like, but are not limited thereto.

  Here, when a pigment is used as the color material, it is preferable to use a pigment dispersant together. Examples of the pigment dispersant used include a polymer dispersant, an anionic surfactant, a cationic surfactant, an amphoteric surfactant, and a nonionic surfactant.

  As the polymer dispersant, a polymer having a hydrophilic structure portion and a hydrophobic structure portion is preferably used. As the polymer having a hydrophilic structure part and a hydrophobic structure part, for example, a condensation polymer and an addition polymer are used. Examples of the condensation polymer include known polyester dispersants. Examples of the addition polymer include addition polymers of monomers having an α, β-ethylenically unsaturated group. By copolymerizing a monomer having an α, β-ethylenically unsaturated group having a hydrophilic group and a monomer having an α, β-ethylenically unsaturated group having a hydrophobic group, A molecular dispersant is obtained. A homopolymer of a monomer having an α, β-ethylenically unsaturated group having a hydrophilic group is also used.

  Monomers having an α, β-ethylenically unsaturated group having a hydrophilic group include monomers having a carboxyl group, a sulfonic acid group, a hydroxyl group, a phosphoric acid group, such as acrylic acid, methacrylic acid, and croton. Acid, itaconic acid, itaconic acid monoester, maleic acid, maleic acid monoester, fumaric acid, fumaric acid monoester, vinyl sulfonic acid, styrene sulfonic acid, sulfonated vinyl naphthalene, vinyl alcohol, acrylamide, methacryloxyethyl phosphate, bis Examples include methacryloxyethyl phosphate, methacryloxyethyl phenyl acid phosphate, ethylene glycol dimethacrylate, and diethylene glycol dimethacrylate.

  Examples of the monomer having an α, β-ethylenically unsaturated group having a hydrophobic group include styrene derivatives such as styrene, α-methylstyrene, vinyltoluene, vinylcyclohexane, vinylnaphthalene, vinylnaphthalene derivatives, and alkyl acrylate esters. Methacrylic acid alkyl ester, methacrylic acid phenyl ester, methacrylic acid cycloalkyl ester, crotonic acid alkyl ester, itaconic acid dialkyl ester, maleic acid dialkyl ester and the like.

  Examples of preferred copolymers as the polymer dispersant include styrene-styrene sulfonic acid copolymer, styrene-maleic acid copolymer, styrene-methacrylic acid copolymer, styrene-acrylic acid copolymer, vinyl naphthalene- Maleic acid copolymer, vinyl naphthalene-methacrylic acid copolymer, vinyl naphthalene-acrylic acid copolymer, alkyl acrylate ester-acrylic acid copolymer, alkyl methacrylate ester-methacrylic acid copolymer, styrene-methacrylic acid Examples include alkyl ester-methacrylic acid copolymer, styrene-acrylic acid alkyl ester-acrylic acid copolymer, styrene-methacrylic acid phenyl ester-methacrylic acid copolymer, and styrene-methacrylic acid cyclohexyl ester-methacrylic acid copolymer. It is done. Moreover, you may copolymerize the monomer which has a polyoxyethylene group and a hydroxyl group with these polymers.

  The weight average molecular weight of the polymer dispersant is preferably, for example, 2000 or more and 50000 or less.

  These polymer dispersants may be used alone or in combination of two or more. The content of the polymer dispersant varies greatly depending on the pigment and cannot be generally stated, but it is preferably 0.1% by mass or more and 100% by mass or less based on the pigment.

Examples of the pigment include pigments that are self-dispersed in water (hereinafter referred to as self-dispersing pigments).
The self-dispersing pigment refers to a pigment that has a water-solubilizing group on the pigment surface and disperses in water without the presence of a polymer dispersant. The self-dispersing pigment can be obtained, for example, by subjecting the pigment to surface modification treatment such as acid / base treatment, coupling agent treatment, polymer graft treatment, plasma treatment, oxidation / reduction treatment, and the like.

  As self-dispersing pigments, in addition to pigments that have been surface-modified to the above pigments, Cab-o-jet-200, Cab-o-jet-300, Cab-o-jet-400 manufactured by Cabot Corporation. IJX-157, IJX-253, IJX-266, IJX-273, IJX-444, IJX-55, Cab-o-jet-250C, Cab-o-jet-260M, Cab-o-jet-270Y, Cab -O-jet-450C, Cab-o-jet-465M, Cab-o-jet-470Y, Cab-o-jet-480M, Microjet Black CW-1, CW-2 manufactured by Orient Chemical Co., etc. Examples include dispersed pigments.

  The self-dispersing pigment is preferably a pigment having at least sulfonic acid, sulfonate, carboxylic acid, or carboxylate as a functional group on the surface thereof. More preferably, it is a pigment having at least a carboxylic acid or a carboxylate as a functional group on the surface.

Here, examples of the pigment include a pigment coated with a resin. This is called a microcapsule pigment, and there are commercially available microcapsule pigments such as those manufactured by DIC and Toyo Ink. In addition, it is not restricted to a commercially available microcapsule pigment, You may use the microcapsule pigment produced according to the objective.
Examples of the pigment also include a resin dispersion type pigment in which a polymer compound is physically adsorbed or chemically bonded to the pigment.
In addition to black, cyan, magenta, and yellow, the pigments include specific color pigments such as red, green, blue, brown, and white, metallic luster pigments such as gold and silver, and colorless or light-colored constitutions. Examples include pigments and plastic pigments.
Examples of the pigment include particles in which silica, alumina, polymer beads or the like are used as a core, and a dye or pigment is fixed on the surface thereof, an insoluble lake of the dye, a colored emulsion, a colored latex, or the like.

  Color materials include pigments, other hydrophilic anionic dyes, direct dyes, cationic dyes, reactive dyes, dyes such as polymer dyes and oil-soluble dyes, wax powders and resin powders colored with dyes And emulsions, fluorescent dyes and fluorescent pigments.

The volume average particle diameter of the color material is, for example, 10 nm or more and 1000 nm or less.
The volume average particle diameter of the color material refers to the particle diameter of the color material itself, or the particle diameter to which the additive has adhered when an additive such as a dispersant is adhered to the color material.
The volume average particle size is measured with a Microtrac UPA particle size analyzer UPA-UT151 (manufactured by Microtrac). The measurement is performed by putting the ink diluted 1000 times into the measurement cell. As the input value at the time of measurement, the viscosity of the specific ink diluent is adopted as the viscosity, and the refractive index of the coloring material is adopted as the particle refractive index.

  The content (concentration) of the color material is, for example, preferably from 1% by mass to 25% by mass, and more preferably from 2% by mass to 20% by mass with respect to the total mass of the ink.

(water)
As water, the water demonstrated with the processing liquid is mentioned.
The water content is preferably 30% by mass or more and 80% by mass or less, and more preferably 35% by mass or more and 70% by mass or less with respect to the total mass of the ink.

(Water-soluble organic solvent)
Examples of the water-soluble organic solvent include the water-soluble organic solvents described in the treatment liquid.
The content of the water-soluble organic solvent is preferably 1% by mass to 50% by mass and more preferably 3% by mass to 30% by mass with respect to the total mass of the ink.

(Other additives)
Examples of other additives include the well-known additives described in the treatment liquid.

(Ink physical properties)
The surface tension of the ink is preferably in the range of 20 mN / m to 40 mN / m, more preferably in the range of 20 mN / m to 35 mN / m, and even more preferably 25 mN / m to 35 mN / m. Range.
The surface tension is measured in a 23 ° C. and 55% RH environment using a Wilhelmy surface tension meter.

The viscosity of the ink is preferably 1 mPa · s to 50 mPa · s, more preferably 1.2 mPa · s to 50 mPa · s, and still more preferably 1.5 mPa · s to 30 mPa · s.
The viscosity is measured using TV-20 (manufactured by Toki Sangyo Co., Ltd.) as a measuring device, at a measurement temperature of 23 ° C. and a shear rate of 750 s ⁻¹ .

<Recording device>
The recording apparatus according to the present embodiment includes an ink set that accommodates the ink set according to the present embodiment and ejects ink and a processing liquid onto the surface of the recording medium, and the ink and the processing liquid contact each other on the surface of the recording medium. Thus, the recording apparatus records an image by discharging from the discharging apparatus.

  In the recording apparatus according to the present embodiment, a recording method for recording an image by using the ink set according to the present embodiment and ejecting the ink and the treatment liquid in contact with each other on the surface of the recording medium is performed. .

  Here, in the recording apparatus (recording method) according to the present embodiment, the ink and the treatment liquid may be ejected so as to come into contact with each other on the surface of the recording medium. From the point of realizing recording of an image with a narrow line width, After the treatment liquid is first ejected onto the recording medium, the ink is preferably ejected onto the recording medium so as to come into contact with the treatment liquid attached to the recording medium.

  The recording apparatus according to the present embodiment may include a processing liquid cartridge that stores the processing liquid according to the present embodiment and is cartridged so as to be attached to and detached from the recording apparatus. Further, the recording apparatus according to the present embodiment may include an ink cartridge containing ink.

Hereinafter, the recording apparatus according to the present embodiment will be described with reference to the drawings.
FIG. 1 is a schematic configuration diagram illustrating a recording apparatus according to the present embodiment. FIG. 2 is a partial plan view showing the periphery of the recording head in the recording apparatus according to the present embodiment.

  For example, as illustrated in FIGS. 1 to 2, the recording apparatus 12 according to the present embodiment includes a paper feed container 16 at a lower portion in a housing 14, and sheets stacked in the paper feed container 16. A mechanism for taking out P (an example of a recording medium) one by one with a take-out roll 18 is provided. The taken paper P is conveyed by a plurality of carry-in roller pairs 20 constituting the carry-in path 22.

  Above the paper supply container 16, an endless conveyance belt 28 supported while tension is applied to the driving roll 24 and the driven roll 26 is disposed. A recording head 30 (an example of an ejection device) and a recording head 31 (an example of an ejection device) are disposed above the transport belt 28 and face a flat portion of the transport belt 28. A region where the recording head 30 faces the flat portion of the conveying belt 28 is an ejection region where ink droplets are ejected from the recording head 30 onto the paper P. The sheet P transported by the carry-in roller pair 20 is held by the transport belt 28 and reaches the discharge region, and is in a state of facing the recording head 30, and ink droplets discharged from the recording head 30 according to image information. Adheres to the surface of the paper P.

Here, each color recording head 30 is connected to each color ink cartridge 30A attached to and detached from the recording apparatus 12 through a supply pipe (not shown), and each color ink is supplied to the recording head 30 by the ink cartridge 30A. Is done.
On the other hand, in the recording head 31, the processing liquid is connected to the processing liquid cartridge 31A through a supply pipe (not shown), and the processing liquid is supplied to the recording head 31 by the processing liquid cartridge 31A.

For example, as shown in FIG. 2, the recording head 30 has a length in a direction in which an effective recording area (arrangement area of nozzles that eject ink) intersects the width of the paper P (for example, intersects (for example, perpendicular)) with the paper P. This is a long recording head.
The recording head 30 is not limited to this, and is a recording head that is shorter than the width of the paper P, and is a recording head that moves in the width direction of the paper P and discharges ink (so-called carriage method). There may be.

  The recording head 30 may be a so-called thermal system that ejects ink droplets by heat, or a so-called piezoelectric system that ejects ink droplets by pressure.

  As the recording head 30, for example, four recording heads corresponding to four colors of yellow (Y), magenta (M), cyan (C), and black (K) are arranged in an array along the transport direction. ing. Of course, the recording head 30 is not limited to the form in which the four recording heads 30 corresponding to each of the four colors are arranged, but in a form in which one recording head 30 corresponding to black (K) is arranged according to the purpose. There may be a form in which four or more recording heads 30 corresponding to each of four or more colors including other intermediate colors are arranged.

A recording head 31 that discharges the processing liquid (S) is disposed upstream of the recording head 30 (upstream in the conveyance direction of the paper P). The treatment liquid (S) is ejected before or after ink is ejected (in FIG. 1, before ink is ejected).
Since the configuration of the recording head 31 is the same as that of the recording head 30, description thereof is omitted.

  A charging roll 32 is disposed upstream of the recording head 30 and the recording head 31 (upstream in the conveyance direction of the paper P). The charging roll 32 is driven while sandwiching the conveyance belt 28 and the paper P with the driven roll 26, generates a potential difference with the grounded driven roll 26, and charges the paper P to the conveyance belt 28. Adsorb electrostatically.

  A separation plate 34 is disposed downstream of the recording head 30 and the recording head 31 (downstream in the conveyance direction of the paper P), and separates the paper P from the conveyance belt 28. The peeled paper P is transported by a plurality of discharge roller pairs 38 constituting a discharge path 36 on the downstream side of the peeling plate 34 (downstream in the transport direction of the paper P), and is discharged on the top of the housing 14. It is discharged into the container 40.

Next, the operation of the recording apparatus 12 according to this embodiment will be described.
In the recording apparatus 12 according to the present embodiment, the paper P is picked up one by one from the paper supply container 16 by the pick-up roll 18 and is transported to the transport belt 28 via the transport-in path 22.
Next, the sheet P is electrostatically attracted to the conveyance belt 28 by the charging roll 32, and is conveyed below the recording head 30 by the rotation of the conveyance belt 28.
Next, the processing liquid is discharged onto the paper P by the recording head 31. These processing liquids are discharged onto the ink adhesion area (image forming area) of the paper P.
Next, on the paper P, ink is ejected by the recording head 30 to an area where the processing liquid is adhered, and a target image is recorded.
When the ink and the processing liquid come into contact with each other, the color material contained in the ink is aggregated.

  Next, the paper P on which ink (image by ink) is recorded is discharged to the paper discharge container 40 via the discharge path 36.

  In this way, in the recording apparatus 12 according to the present embodiment, the paper P on which ink (image by ink) is fixed (formed) is obtained.

  In the recording apparatus 12 according to the present embodiment, the method of directly ejecting ink droplets onto the surface of the paper P by the recording head 30 has been described. However, the present invention is not limited to this, and for example, ink droplets are applied to the intermediate transfer member. A method of transferring ink droplets on the intermediate transfer member onto the paper P after ejection is also possible.

  In the recording apparatus 12 according to the present embodiment, the method of fixing (forming) ink (an image using ink) on a sheet as the paper P has been described. However, a roll paper is used as the paper P using a continuous book machine. Alternatively, a method of recording ink (image by ink) may be used.

  In the recording apparatus 12 according to the present embodiment, a heating mechanism such as hot cloth drying, drying with a drying drum, or heating by laser irradiation may be provided after ink and processing liquid are discharged onto the paper P.

  In other words, the recording apparatus 12 according to the present embodiment is not limited to the above configuration, and a known inkjet recording apparatus is employed.

  Needless to say, the present embodiment is not construed as being limited, and is realized within a range that satisfies the requirements of the present invention.

  EXAMPLES Hereinafter, the present invention will be specifically described with reference to examples, but the present invention is not limited to these examples. In the following, “part” and “%” are based on mass unless otherwise specified.

<Example 1>
(Preparation of treatment liquid (1))
2-pyrrolidone-5-carboxylic acid: 10.0% by mass
-Lithium hydroxide: 1.1% by mass
・ Glycerin: 10.0% by mass
・ Orphine E1010 (manufactured by Nissin Chemical Industry Co., Ltd.): 1.0% by mass
Aqueous polypropylene emulsion (aqueous dispersion of polypropylene particles (solid content 30% by mass), polypropylene Mw = 1000000, particle D50v = 0.125 μm): 16.7% by mass
・ Pure water: 61.2% by mass
After mixing the said component, it filtered with a 5 micrometer filter and obtained the aqueous process liquid (1). The pH of this treatment liquid was 3.5.

(Preparation of black ink (1))
・ Carbon black: 5.0% by mass
・ Styrene-acrylic acid Na-acrylic acid alkyl ester copolymer: 2.0% by mass
・ Glycerin: 15.0% by mass
・ 2-Pyrrolidone: 5.0% by mass
・ 1,2-hexanediol: 3.0% by mass
・ Orphine E1010 (manufactured by Nissin Chemical Industry Co., Ltd.): 1.5% by mass
・ Pure water: 68.5% by mass
After mixing the above components, the mixture was filtered with a 5 μm filter to obtain an aqueous black ink (1).

  The ink set of the obtained treatment liquid (1) and black ink (1) was used as the ink set of Example 1.

<Example 2>
(Preparation of treatment liquid (2))
-Succinic acid: 5.9% by mass
-Sodium hydroxide: 2.4% by mass
・ Glycerin: 8.0% by mass
・ Diethylene glycol: 7.0% by mass
・ Orphine E1004 (manufactured by Nissin Chemical Industry Co., Ltd.): 0.5% by mass
・ Surfinol 485 (manufactured by Nissin Chemical Industry Co., Ltd.): 0.5% by mass
-Aqueous polypropylene emulsion (aqueous dispersion of polypropylene particles (solid content 30% by mass), polypropylene Mw = 200000, D50v = 0.08 μm): 16.7% by mass
・ Pure water: 59.0% by mass
After mixing the said component, it filtered with a 5-micrometer filter and obtained the aqueous processing liquid (2). The pH of this treatment liquid was 3.9.

  An ink set of the obtained treatment liquid (2) and the black ink (1) prepared in Example 1 was used as the ink set of Example 2.

<Example 3>
(Preparation of treatment liquid (3))
2-pyrrolidone-5-carboxylic acid: 7.0% by mass
・ Lithium hydroxide: 0.8% by mass
・ Glycerin: 8.0% by mass
・ Triethylene glycol: 5.0% by mass
・ Orphine E1010 (manufactured by Nissin Chemical Industry Co., Ltd.): 1.0% by mass
・ Surfinol 104 (manufactured by Nissin Chemical Industry Co., Ltd.): 0.1% by mass
-Aqueous polyethylene emulsion (aqueous dispersion of polyethylene particles (solid content 25% by mass), polyethylene Mw = 5000000, polyethylene particle D50v = 0.170 μm): 20.0% by mass
・ Pure water: 58.1% by mass
After mixing the said component, it filtered with a 5 micrometer filter, and obtained the aqueous processing liquid (3). The pH of this treatment solution was 4.1.

  The ink set of the obtained treatment liquid (3) and the black ink (1) prepared in Example 1 was used as the ink set of Example 3.

<Example 4>
(Preparation of treatment liquid (4))
・ Malic acid: 5.0% by mass
・ Sodium hydroxide: 1.2% by mass
・ Diethylene glycol: 8.0% by mass
1,2-hexanediol: 1.0% by mass
・ Orphine E1010 (manufactured by Nissin Chemical Industry Co., Ltd.): 1.5% by mass
Aqueous polybutene emulsion (aqueous dispersion of polybutene particles (solid content 20 mass%), polyethylene Mw = 800,000, polyethylene particles D50v = 0.230 μm): 25.0 mass%
・ Pure water: 58.3 mass%
After mixing the said component, it filtered with a 5 micrometer filter, and obtained the aqueous processing liquid (4). The pH of this treatment liquid was 3.4.

  Then, an ink set of the obtained treatment liquid (4) and the black ink (1) prepared in Example 1 was used as an ink set of Example 4.

<Example 5>
(Preparation of treatment liquid (5))
2-pyrrolidone-5-carboxylic acid: 10.0% by mass
-Lithium hydroxide: 1.1% by mass
・ Glycerin: 10.0% by mass
・ Orphine E1010 (manufactured by Nissin Chemical Industry Co., Ltd.): 1.0% by mass
Aqueous polypropylene emulsion (aqueous dispersion of polypropylene particles (solid content 30% by mass), polypropylene Mw = 1000000, particle D50v = 0.125 μm): 6.7% by mass
・ Pure water: 71.2% by mass
After mixing the said component, it filtered with a 5-micrometer filter and obtained the aqueous processing liquid (5). The pH of this treatment liquid was 3.7.

  An ink set of the obtained treatment liquid (5) and the black ink (1) prepared in Example 1 was used as the ink set of Example 5.

<Example 6>
(Preparation of treatment liquid (6))
2-pyrrolidone-5-carboxylic acid: 10.0% by mass
-Lithium hydroxide: 1.1% by mass
・ Glycerin: 10.0% by mass
・ Orphine E1010 (manufactured by Nissin Chemical Industry Co., Ltd.): 1.0% by mass
-Aqueous polypropylene emulsion (aqueous dispersion of polypropylene particles (solid content 30% by mass), polypropylene Mw = 1000000, particle D50v = 0.125 μm): 33.3% by mass
・ Pure water: 44.6% by mass
After mixing the said component, it filtered with a 5-micrometer filter and obtained the aqueous processing liquid (6). The pH of this treatment liquid was 3.3.

  Then, an ink set of the obtained treatment liquid (6) and the black ink (1) prepared in Example 1 was used as an ink set of Example 6.

<Example 7>
(Preparation of treatment liquid (7))
・ Glutamic acid: 2% by mass
・ Sodium glutamate: 5% by mass
・ Diglycerin: 5.0% by mass
-Polyethylene glycol 400: 5.0% by mass
・ Orphine E1010 (Nissin Chemical Industry Co., Ltd.): 0.5% by mass
・ Surfinol 440 (manufactured by Nissin Chemical Industry Co., Ltd.): 0.2% by mass
Aqueous polypropylene emulsion (aqueous dispersion of polypropylene particles (solid content 30% by mass), polypropylene Mw = 30000, D50v = 0.07 μm): 20% by mass
・ Pure water: 59.0% by mass
After mixing the said component, it filtered with a 5 micrometer filter, and obtained the aqueous process liquid (7). The pH of this treatment liquid was 4.3.

  An ink set of the obtained treatment liquid (7) and the black ink (1) prepared in Example 1 was used as the ink set of Example 7.

<Example 8>
(Preparation of treatment liquid (8))
・ Sodium dihydrogen phosphate: 6% by mass
・ Glycerin: 5.0% by mass
・ Triethylene glycol monomethyl ether: 2.0% by mass
・ Orphine E1010 (manufactured by Nissin Chemical Industry Co., Ltd.): 0.7% by mass
・ 1,2-octanediol: 0.4% by mass
Aqueous polyethylene emulsion (aqueous dispersion of polyethylene particles (solid content 20% by mass), polyethylene Mw = 10000000, polyethylene particle D50v = 0.260 μm): 30% by mass
・ Pure water: 55.9% by mass
After mixing the said component, it filtered with a 5 micrometer filter, and obtained the aqueous processing liquid (3). The pH of this treatment liquid was 4.5.

  The ink set of the treatment liquid (8) obtained and the black ink (1) prepared in Example 1 was used as the ink set of Example 8.

<Comparative Example 1>
No treatment liquid was used, and only the black ink (1) prepared in Example 1 was used as the ink set (ink) of Comparative Example 1.

<Comparative example 2>
(Preparation of comparative treatment liquid (C1))
2-pyrrolidone-5-carboxylic acid: 10% by mass
-Lithium hydroxide: 1.1% by mass
・ Glycerin: 10% by mass
・ Orphine E1010 (manufactured by Nissin Chemical Industry Co., Ltd.): 1.0% by mass
・ Pure water: 77.9% by mass
After mixing the above components, filtration was performed with a 0.45 μm filter to obtain an aqueous comparative treatment liquid (C1). The pH of this comparative processing solution was 3.4.

  The ink set of the comparative treatment liquid (C1) obtained and the black ink (1) prepared in Example 1 was used as the ink set of Comparative Example 2.

<Comparative Example 3>
(Preparation of comparative treatment liquid (C1))
・ Glycerin: 10% by mass
・ Orphine E1010 (manufactured by Nissin Chemical Industry Co., Ltd.): 1.0% by mass
-Aqueous polypropylene emulsion (aqueous dispersion of polypropylene particles (solid content 30% by mass), polypropylene Mw = 1500,000, D50v = 0.115 μm): 33.3% by mass
・ Pure water: 55.7% by mass
After mixing the said component, it filtered with a 5 micrometers filter, and obtained the aqueous | water-based comparative process liquid (C2). The pH of this comparative processing solution was 9.5.

  The ink set of the comparative treatment liquid (C2) obtained and the black ink (1) prepared in Example 1 was used as the ink set of Comparative Example 3.

<Comparative example 4>
(Preparation of comparative treatment liquid (C3))
2-pyrrolidone-5-carboxylic acid: 10% by mass
-Lithium hydroxide: 1.1% by mass
・ Glycerin: 10% by mass
・ Orphine E1010 (manufactured by Nissin Chemical Industry Co., Ltd.): 1.0% by mass
-Polyethylene glycol 50000 (water-soluble polymer): 1.0% by mass
・ Pure water: 76.9% by mass
After mixing the above components, filtration was performed with a 0.45 μm filter to obtain an aqueous comparative treatment liquid (C3). The pH of this comparative processing solution was 3.4.

  Then, an ink set of the obtained comparative treatment liquid (C3) and the black ink (1) prepared in Example 1 was used as an ink set of Comparative Example 4.

<Comparative Example 5>
(Preparation of comparative treatment liquid (C4))
2-pyrrolidone-5-carboxylic acid: 7% by mass
・ Lithium hydroxide: 0.7% by mass
・ Glycerin: 8% by mass
・ 2-Pyrrolidone: 3% by mass
・ Triethylene glycol monobutyl ether: 4% by mass
Aqueous acrylic emulsion (Acrylic ester polymer particle aqueous dispersion (solid content 35% by mass), Mw = 200000, D50v = 0.25 μm): 20% by mass
・ Pure water: 57.3% by mass
After mixing the said component, it filtered with a 5 micrometers filter, and obtained the aqueous | water-based comparative process liquid (C4). The pH of this comparative processing solution was 3.7.

  The ink set of the comparative treatment liquid (C4) obtained and the black ink (1) prepared in Example 1 was used as the ink set of Comparative Example 5.

<Evaluation>
The ink set obtained in each example was accommodated in two cartridges (tanks) of a prototype printer having two piezo-type recording heads with a resolution of 600 dpi (dot per inch). However, in Comparative Example 1, only ink was stored in a cartridge (tank).
Using this prototype printer, after ejecting the processing liquid from each recording head onto the recording medium, the 1-dot line image (line image) and the 2-point character image ( “Sound”, “Sound”, and “Ru” character images) were printed. For the recording medium, “Opera cream paper (manufactured by Nippon Paper Industries)” was used as book paper with high ink permeability. And the following evaluation was performed about the obtained image. The results are shown in Table 1.

(Measurement of line width of line image)
The line width of the obtained 1 dot line image was obtained using an image analyzer. The line width was determined as an average value of the line widths at a total of three places, two at both ends of the line image and one at the center.

(Evaluation of text image quality)
The character image was visually observed and evaluated according to the following criteria.
-Evaluation criteria-
A (◯): All characters can be read B (△): Some characters are difficult to read, but can be read temporarily C (×): Many characters cannot be read

  From the above results, it can be seen that in this embodiment, the line width of the line image (line image) is narrower than that of the comparative example, and the collapse of the character image is also suppressed.

Details of abbreviations and the like in Table 1 are as follows.
PCA: 2-pyrrolidone-5-carboxylic acid SA: succinic acid PO particles: polyolefin particles PP particles: polypropylene particles PE particles: polyethylene particles PB particles: polybutene particles

DESCRIPTION OF SYMBOLS 12 Recording apparatus 14 Housing | casing 16 Paper supply container 18 Roll 20 Carry-in roller pair 22 Carry-in path 24 Drive roll 26 Driven roll 28 Conveyor belt 30 Recording head 30A Ink cartridge 31 Recording head 31A Treatment liquid cartridge 32 Charging roll 34 Release plate 36 Discharge path 38 discharge roller pair 40 discharge container

Claims (8)

  An inkjet processing solution comprising a colorant flocculant, polyolefin particles, water, and an aqueous organic solvent.   The inkjet treatment liquid according to claim 1, wherein the polyolefin particles are polypropylene particles.   The inkjet processing liquid according to claim 1, wherein the color material flocculant is at least one selected from the group consisting of organic acids and salts of organic acids.   An inkjet treatment liquid cartridge containing an inkjet treatment liquid containing a colorant flocculant, polyolefin particles, water, and an aqueous organic solvent. An ink-jet ink comprising a colorant, water, and an aqueous organic solvent;
The processing liquid for inkjets of any one of Claims 1-3,
An ink-jet ink set comprising: An ink-jet ink cartridge containing ink-jet ink containing a coloring material, water, and an aqueous organic solvent;
An ink jet processing liquid cartridge containing the ink jet processing liquid according to any one of claims 1 to 3,
An ink-jet ink cartridge set comprising: A discharge device that contains the inkjet ink set according to claim 5 and that discharges the inkjet ink and the inkjet processing liquid onto a surface of a recording medium,
A recording apparatus that records an image by ejecting the ink-jet ink and the ink-jet processing liquid from the ejection apparatus so as to contact each other on the surface of the recording medium.   A recording method for recording an image by ejecting the ink-jet ink and the ink-jet processing liquid in contact with each other on the surface of a recording medium using the ink-jet ink set according to claim 5.