RU2588216C2 - Ink for jet printing and device for jet printing - Google Patents

Abstract

FIELD: printing industry.

SUBSTANCE: invention relates to inks and device for jet printing. Ink for jet printing contains a water-dispersible colouring agent, a surfactant, a wetting agent, a water-dispersible resin, a wetting agent, containing at least polyatomic alcohol with equilibrium moisture content equal to 30 wt% or higher at 23 °C and relative humidity of 80 %; compound of formula (1), and water and at least one compound from a group of compounds of formulae (2)-(4), specified in description. Water-dispersible colouring agent is selected from a group consisting of self-dispersed pigment, pigment dispersed with a pigment dispersing agent and particles of resin, containing pigment. Total amount of water-dispersible colouring substance and water-dispersible resin ranges from 8 to 35 % by weight. Weight ratio of water-dispersible resin to water-dispersible colouring substance ranges from 2 to 8. Described also is a device for jet printing, containing said ink.

EFFECT: disclosed ink provides an image with high glossiness and resistance to offsetting with prevention of shrinkage and foaming.

7 cl, 2 dwg, 2 tbl, 20 ex

Description

Technical field

This invention relates to inkjet ink and an inkjet device.

State of the art

An inkjet printing apparatus is an apparatus for forming an image by ejecting a small amount of ink by applying bubbles formed by heating in a piezoelectric or electrostatic manner to apply ink to a printing medium such as paper, followed by drying of the ink.

Recently, there have been high demands on inkjet printing devices for industrial applications, and inkjet printing devices that can match high-speed printing and the use of various printing media are desirable. When the print speed increases, an inkjet printer equipped with a linear head is desirable.

In addition, taking into account environmental friendliness and safety, there is a need for aqueous ink for inkjet printing.

Patent Document 1 describes an aqueous ink composition comprising a pigment, water, an organic solvent, a resin and a surface adjusting agent for an ink composition in which the organic solvent is a compound represented by the following general formula:

R ¹ OCH ₂ CH ₂ CONR ² R ³

(where R ¹ represents a C1-C8 alkyl group; and each of R ² and R ³ independently represents a hydrogen atom, a C1-C6 alkyl group or an ester bond group in a C1-C6 alkyl group), and in which the organic solvent is from 10% by weight to 49% by weight with respect to the total amount of water and the organic solvent.

However, when an image having a large amount of applied aqueous ink, such as a photograph and a drawing, is printed on a sheet for printing commercial products, glossiness and resistance to smearing of the image cannot be achieved while preventing wrinkling and foaming. Accordingly, it is currently desirable to provide inkjet ink that can provide glossiness and resistance to smearing of an image while preventing wrinkling and foaming when an image having a large amount of applied aqueous ink, such as a photograph and a drawing, is formed on a commercial print sheet. products.

List of links

Patent documents

Patent Document 1: Japanese Patent Application Laid-Open (JP-A) No. 2011-68838

SUMMARY OF THE INVENTION

Technical problem

This invention seeks to solve various problems in the art and to achieve the following objective. The aim of this invention is the provision of inkjet ink that has excellent gloss and resistance to smearing of the image and is capable of preventing wrinkling and foaming, even when an image having a large amount of inkjet ink applied is formed on a sheet for printing commercial products.

Solution

Means for solving the above problems are as follows:

The inkjet inks of this invention comprise:

Inkjet ink containing:

water-dispersible coloring matter;

surface-active substance;

wetting agent;

water dispersible resin;

a moisturizing agent containing at least polyhydric alcohol having an equilibrium humidity of 30% by weight or higher at 23 ° C and a relative humidity (RH) of 80%;

a compound represented by the following general formula (1);

water and

at least one compound from the group consisting of a compound represented by the following general formula (2), a compound represented by the following general formula (3), and a compound represented by the general formula (4) below,

where the water-dispersible colorant is at least one substance selected from the group consisting of a self-dispersible pigment, a pigment dispersed by a pigment dispersing agent, and resin particles, each of which contains a pigment,

where the total amount of water-dispersible coloring material and water-dispersible resin is from 8% by weight to 35% by weight, and

where the mass ratio of water-dispersible resin to water-dispersible coloring material is from 2 to 8:

General formula (1),

where R ₁ represents a C4-C6 alkyl group,

General formula (2),

where R ₂ represents a hydrogen atom, a methyl group or an ethyl group, and R ₃ represents a C1-C4 alkyl group,

General formula (3),

where R ₄ represents a methyl group or ethyl group, and R ₅ represents a hydroxyl group, a C1-C8 alkyl group, a cycloalkyl group or an aryl group,

,

,

General formula (4)

where each of R ₆ and R ₇ independently represents a C1-C8 alkyl group.

Advantages of the Invention

The present invention can solve the above various problems in the art, and can provide inkjet inks that have excellent gloss and resistance to smearing of the image and are capable of preventing wrinkling and foaming from occurring even when an image having a large amount of ink jet ink is applied form on a sheet for printing commercial products.

Brief Description of the Drawings

FIG. 1 is a perspective view for explaining an ink jet printing apparatus in a state in which the lid of the ink cartridge loading compartment is open.

FIG. 2 is a schematic diagram for explaining the structure of an inkjet printing apparatus as a whole.

Description of Embodiments

(Inkjet Ink)

Inkjet ink contains: a water-dispersible colorant; surface-active substance; wetting agent; a water-dispersible resin, a moisturizing agent containing at least polyhydric alcohol having an equilibrium moisture content of 30% by weight or more at 23 ° C and a relative humidity (RH) of 80%; a compound represented by general formula (1); water and at least one compound selected from the group consisting of a compound represented by general formula (2), a compound represented by general formula (3), and a compound represented by general formula (4). Inkjet ink may additionally contain 3-methoxy-N, N-dimethylpropionamide and other components, if necessary.

The water-dispersible colorant is a self-dispersible pigment, a pigment dispersed by a pigment dispersing agent, or resin particles, each of which contains a pigment.

The total amount of pigment and water dispersible resin in inkjet ink is from 8% by weight to 35% by weight. When their total amount is less than 8% by mass, the glossiness and the resistance to smearing of the image are deteriorated when an image having a large amount of ink jet applied is formed on a sheet for printing commercial products. When their total amount is more than 35% by mass, the resulting ink has a low output stability.

The mass ratio of the water-dispersible resin to the pigment is from 2 to 8. When their mass ratio is less than 2, the resulting glossiness is low when an image having a large amount of inkjet ink applied is formed on a sheet for printing commercial products. When their mass ratio is greater than 8, the resulting ink has a low output stability.

Inkjet ink contains at least one compound selected from the group consisting of compounds represented by general formulas (2) to (4), together with a compound represented by general formula (1), and therefore wrinkling and foaming of ink for ink printing can be prevented when an image having a large amount of inkjet ink applied is formed on a sheet for printing commercial products.

<A compound represented by general formula (1)>

The compound represented by general formula (1) is suitably selected depending on the intended purpose without any limitation, and examples thereof include compounds represented by the following chemical formulas (1-1) according to (1-3). They can be used individually or in combination.

<A compound represented by general formula (2)>

The compound represented by general formula (2) is suitably selected depending on the intended purpose without any limitation, and examples thereof include compounds represented by the following chemical formulas (2-1) according to (2-4). They can be used individually or in combination.

<A compound represented by general formula (3)>

The compound represented by general formula (3) is suitably selected depending on the intended purpose without any limitation, and examples thereof include compounds represented by the following chemical formulas (3-1) according to (3-6). They can be used individually or in combination.

The compound represented by general formula (4) is suitably selected depending on the intended purpose without any limitation, and examples thereof include compounds represented by the following chemical formulas (4-1) according to (4-5). They can be used individually or in combination.

The total number of compounds represented by general formulas (1) to (4) contained in inkjet ink is preferably from 1% by weight to 50% by weight, more preferably from 2% by weight to 40% by weight. When their total amount is less than 1% by mass, wrinkling or foaming may occur when an image having a large amount of ink jet applied is formed on a sheet for printing commercial products. When their total amount is more than 50% by mass, the stability of the output of the resulting ink may be impaired.

<3-methoxy-N, N-dimethylpropionamide>

Inkjet ink preferably further comprises a compound (3-methoxy-N, N-dimethylpropionamide) represented by the following chemical formula:

CH ₃ OCH ₂ CH ₂ CON (CH ₃ ) ₂

3-methoxy-N, N-dimethylpropionamide has a high boiling point (namely, 216 ° C), high equilibrium humidity (namely, 39.2% by weight) at 23 ° C and a relative humidity (RH) of 80% and very low viscosity (1.48 MPa · s) at 25 ° C. In addition, 3-methoxy-N, N-dimethylpropionamide is very soluble in compounds represented by the general formulas (1) to (4), and in water. Accordingly, 3-methoxy-N, N-dimethylpropionamide can reduce ink viscosity for inkjet printing and therefore improves ink stability.

The amount of 3-methoxy-N, N-dimethylpropionamide in the ink jet ink is preferably from 1% by mass to 50% by mass, more preferably from 2% by mass to 40% by mass. When its amount is less than 1% by mass, the stability of the release may be insufficient. When its amount is more than 50% by mass, wrinkling or foaming may occur when an image having a large amount of ink jet applied is formed on a sheet for printing commercial products.

<Water>

Water is suitably selected depending on the intended purpose without any limitation, and examples thereof include pure water or ultrapure water, such as ion-exchanged purified water, ultrafiltered water, Milli-Q water and distilled water. They can be used individually or in combination.

<Moisturizing Agent>

The moisturizing agent contains at least polyhydric alcohol having an equilibrium moisture content of 30% by mass or more at 23 ° C and a relative humidity (RH) of 80%, and may further comprise another moisturizing agent, if necessary.

The moisturizing agent may consist of only one polyhydric alcohol having an equilibrium moisture content of 30% by mass or more at 23 ° C and a relative humidity (RH) of 80%.

<< Polyhydric alcohol having an equilibrium humidity of 30% by mass or more at 23 ° C and a relative humidity (RH) of 80% >>

A polyhydric alcohol having an equilibrium moisture content of 30% by mass or more at 23 ° C and a relative humidity (RH) of 80% (may simply be called "polyhydric alcohol" later in this document) is selected appropriately depending on the intended purpose without any restrictions, and examples thereof include 1,2,3-butanetriol (38% by weight), 1,2,4-butanetriol (41% by weight), glycerin (49% by weight), diglycerin (38% by weight), triethylene glycol (39% by mass), tetraethylene glycol (37% by mass), diethylene glycol (43% by mass), and 1,3-butanediol (35% by mass). They can be used individually or in combination. As the polyhydric alcohol, among the above polyhydric alcohol compounds, glycerol and 1,3-butanediol are preferred. It should be noted that the value in the sentence above means equilibrium humidity at 23 ° C and relative humidity (RH) of 80%.

The amount of polyhydric alcohol in inkjet ink is preferably from 2% by weight to 50% by weight, more preferably from 5% by weight to 40% by weight. When its amount is less than 2% by mass, the stability of the release may be insufficient. When its amount is more than 50% by mass, wrinkling or foaming may occur when an image having a large amount of ink jet applied is formed on a sheet for printing commercial products.

The equilibrium moisture content of the polyhydric alcohol can be determined by holding a Petri dish, in which 1 g of polyhydric alcohol is weighed, in a desiccator in which the temperature and humidity of the interior are maintained at 23 ° C ± 1 ° C, and relative humidity (RH) 80% ± 3 %, respectively, when using a saturated aqueous solution of potassium chloride / sodium chloride. The equilibrium moisture content of the polyhydric alcohol can then be calculated using the following formula:

(Mass of moisture absorbed by polyhydric alcohol) / (Mass of polyhydric alcohol + Mass of moisture absorbed by polyhydric alcohol) × 100

<< Other moisturizing agents >>

Examples of other wetting agents include: a polyhydric alcohol having an equilibrium moisture content of less than 30% by weight at 23 ° C and a relative humidity (RH) of 80%, such as dipropylene glycol, 1,5-pentanediol, propylene glycol, 2-methyl-2,4 pentanediol, ethylene glycol, tripropylene glycol, hexylene glycol, polyethylene glycol, polypropylene glycol, 1,10-hexanediol, 1,2,10-hexanetriol, trimethylol ethane and trimethylol propane; polyhydric alcohol alkyl ether such as ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, ethylene glycol mono-2-ethylhexyl ether; a polyhydric alcohol aryl ester such as ethylene glycol monophenyl ether and ethylene glycol monobenzyl ether; a nitrogen containing a heterocyclic compound such as 2-pyrrolidone, N-methyl-2-pyrrolidone, 1,3-dimethyl-2-imidazolidinone, ε-caprolactam and γ-butyrolactone; an amide such as formamide, N-methylformamide, N, N-dimethylformamide, and N, N-diethylformamide; an amine such as monoethanolamine, diethanolamine, triethanolamine, N, N-dimethylmonoethanolamine, N-methyldiethanolamine, N-methylethanolamine, N-phenylethanolamine and 3-aminopropyl diethylamine; a sulfur-containing compound such as dimethyl sulfoxide, sulfolane and thiodiglycol; and others, such as propylene carbonate and ethylene carbonate. They can be used individually or in combination.

As the above other moisturizing agents, saccharides and their derivatives can be suitably used.

-Saccharides and their derivatives-

Saccharides are suitably selected depending on the intended purpose without any limitation, and examples thereof include: monosaccharides such as glucose, mannose, fructose, ribose, xylose, arabinose and galactose; disaccharides such as maltose, cellobiose, lactose, sucrose and tragalose; oligosaccharides such as maltotriose; and a polysaccharide such as α-cyclodextrin and cellulose. They can be used individually or in combination.

Examples of saccharide derivatives include: saccharide reducing sugars such as sugar alcohol (eg, maltitol and sorbitol); oxidized sugar obtained with aldonic acid or uronic acid; and others, such as amino acid and thioacid. They can be used individually or in combination.

<Water-dispersible resin>

The state of the water-dispersible resin in water is an emulsion, which can be an emulsion with a single-layer structure, an emulsion with a core / shell structure, or an emulsion from a mechanical forced feed.

The water dispersible resin is suitably selected depending on the intended purpose without any limitation, and examples thereof include condensation synthesized resin such as polyester, polyurethane, epoxy resin, polyamide, polyester, (meth) acrylic resin, acrylic silicone resin and fluorine-containing resin; additive synthesized resin such as polyolefin, polystyrene resin, polyvinyl alcohol resin, polyvinyl ester resin, polyacrylic acid resin and unsaturated carboxylic acid resin; and a natural polymer, such as cellulose, wood resin and natural rubber. They can be used individually or in combination. Among those listed above, acrylic silicone resin and fluorine-containing resin are preferred as a water-dispersible resin.

<< Fluorine Resin >>

The fluorine-containing resin is preferably a fluorine-containing resin having a constituent derived from a fluoroolefin, more preferably a fluorine-containing resin having a constituent derived from a fluoroolefin and a constituent derived from vinyl ether, and even more preferably an alternating copolymer of fluoroolefin and vinyl.

- Compound link derived from fluoroolefin -

The constituent derived from a fluoroolefin is suitably selected depending on the intended purpose without any limitation, and examples thereof include a constituent represented by the following formulas:

−CF ₂ CF ₂ -, −CF ₂ CF (CF ₃ ) -, −CF ₂ CFCl−

-A compound derived from vinyl ether-

The compound derived from vinyl ether is suitably selected depending on the intended purpose without any limitation, and examples thereof include the compound represented by the following formulas:

Examples of fluorine-containing resins that are commercial products include: FLUONATE (registered trademark) FEM-500, FEM-600, DIC GUARD F-52S, F-90, F-90M, F-90N and AQUAFURFURAN TE-5A (all manufactured by the company DIC Corporation); and LUMIFLON FE4300, FE4500, FE4400, AsahiGuard AG-7105, AG-950, AG-7600, AG-7000 and AG-1100 (all manufactured by ASAHI GLASS CO., LTD.).

The water dispersible resin may be either a homopolymer or a copolymer.

The water-dispersible resin may be a self-dispersible resin or a dispersible resin with a dispersing agent. Among them, a water-dispersible resin obtained by emulsion polymerization or suspension polymerization of an ionomer or unsaturated polyester or polyurethane monomer is preferred. In the case where a water-dispersible resin is prepared by emulsion polymerization of unsaturated monomers, a water-dispersible resin is obtained by performing a reaction in water to which unsaturated monomers, a polymerization initiator, a surfactant, a chain transfer agent, a chelating agent, a pH adjuster, etc. are added.

<< Unsaturated monomer >>

The unsaturated monomer is suitably selected depending on the intended purpose without any limitation, and examples thereof include: unsaturated carboxylic acid, such as acrylic acid, methacrylic acid, itaconic acid, fumaric acid and maleic acid; ester monoacid (meth) acrylic acid such as methyl methacrylate, ethyl methacrylate, isopropyl, n-butyl methacrylate, isobutyl methacrylate, n-amilmetakrilat, izoamilmetakrilat, n-hexyl methacrylate, 2-ethylhexyl methacrylate, octyl methacrylate, decyl methacrylate, dodecyl methacrylate, octadecyl methacrylate, cyclohexyl methacrylate, phenyl methacrylate, benzyl methacrylate , glycidyl methacrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate, dimethylaminoethyl methacrylate, methacryloxyethyltrimethylammonium salt, 3-methacryloxypropyltrimeth oxisilane, methyl acrylate, ethyl acrylate, isopropyl acrylate, n-butyl acrylate, isobutyl acrylate, n-amyl acrylate, isoamyl acrylate, n-hexyl acrylate, 2-ethyl hexyl acrylate, octyl acrylate, acrylate, decyl acrylate, acrylate, acrylate, acrylate, acrylate hydroxypropyl acrylate, dimethylaminoethyl acrylate and an acryloxyethyltrimethylammonium salt; polybasic ester of (meth) acrylic acid, such as ethylene glycol dimethacrylate, diethylene glycol dimethacrylate, triethylene glycol dimethacrylate, polietilenglikoldimetakrilat, 1,3-butilenglikoldimetakrilat, 1,4-butilenglikoldimetakrilat, 1,10-hexanediol, neopentilglikoldimetakrilat, dipropilenglikoldimetakrilat, polipropilenglikoldimetakrilat, polibutilenglikoldimetakrilat, 2,2'- bis (4-methacryloxydiethoxyphenyl) propane, trimethylol propane trimethacrylate, trimethylol ethane trimethacrylate, polyethylene glycol diacrylate, triethylene glycol diacrylate, 1,3-butylene glycol diacrylate, 1,4-butylene glycol diacrylate, 1,10-hexanediol diacrylate, neopentyl glycol diacrylate, 1,9-nonanediol diacrylate, polypropylene glycol diacrylate, 2,2′-bis (4-acryloxypropyl, 2,2′-bis (4-acryloxypropyl, 4-acryloxydiethoxyphenyl) propane, trimethylol propane triacrylate, trimethyl ethane triacrylate, tetramethyl methane triacrylate, dimethyl ethyl tetra acrylate, tetramethylol methane tetra acrylate, pentaerythritol tetra acrylate and dipentaerythritol hexa; (meth) acrylic acid amide such as acrylamide, methacrylamide, N, N-dimethylacrylamide, methylene bisacrylamide and 2-acrylamide-2-methylpropanesulfonic acid; an aromatic vinyl compound such as styrene, α-methylstyrene, vinyl toluene, 4-tert-butyl styrene, chlorostyrene, vinylanisole, vinylnaphthalene and divinylbenzene; a vinyl cyano compound such as acrylonitrile and methacrylonitrile; a vinyl compound such as vinyl acetate, vinylidene chloride, vinyl chloride, vinyl ether, vinyl ketone, vinyl pyrrolidone, vinyl sulfonic acid or its salts, vinyl trimethoxysilane and vinyl triethoxysilane; an allyl compound such as allyl sulfonic acid and its salts, allylamine, allyl chloride, diallylamine and diallyldimethylammonium salts; an olefin such as ethylene and propylene; a diene compound such as butadiene and chloroprene; and oligomers, such as a styrene oligomer having a methacryloyl group, a styrene acrylonitrile oligomer having a methacryloyl group, a methyl methacrylate oligomer having a methacryloyl group, a dimethylsiloxane oligomer having a methacryloyl group, and an acrylpolyol ether group. They can be used individually or in combination.

<< Physical properties of water-dispersible resin >>

The average particle diameter (D ₅₀ ) of the water dispersible resin is preferably from 50 nm to 200 nm. When the average particle diameter (D ₅₀ ) is less than 50 nm, the viscosity of the inkjet ink of the present invention can increase. When its average particle diameter (D ₅₀ ) is greater than 200 nm, the resulting ink may cause poor output stability.

The water-dispersible resin has the purpose of allowing the water-dispersible coloring material to be fixed on paper, and it improves the ability to fix the water-dispersible coloring material by forming a film at room temperature. For this reason, the minimum film formation temperature (MFT) of the water dispersible resin is preferably 30 ° C or lower.

The glass transition temperature of the water-dispersible resin is preferably −40 ° C. or higher. When the glass transition temperature of the water-dispersible resin is lower than -40 ° C, the viscosity of the resin film increases, which may impart stickiness (i.e., stickiness of the dried ink) to the printed material.

The amount of water-dispersible resin contained in the ink jet ink is preferably from 2% by weight to 30% by weight, more preferably from 5% by weight to 25% by weight.

<Water-dispersible colorant>

As described above, the water-dispersible coloring material is at least one material selected from the group consisting of a self-dispersing pigment, a pigment dispersed with a pigment dispersing agent, and resin particles, each of which contains a pigment.

<< Pigment >>

The pigment may be an organic pigment or an inorganic pigment. They can be used individually or in combination. It should be noted that the pigment can be used in combination with a dye to adjust the color tone.

Inorganic pigment

The inorganic pigment is suitably selected depending on the intended purpose without any limitation, and examples thereof include titanium oxide, iron oxide, calcium carbonate, barium sulfate, aluminum hydroxide, barium yellow, cadmium red, chromium yellow, and carbon black. They can be used individually or in combination.

As carbon black, carbon black is preferred having a dibutyl phthalate absorption number (DBP number) of from 25 ml / 100 g to 400 ml / 100 g, more preferably from 30 ml / 100 g to 200 ml / 100 g, and even more preferably from 50 ml / 100 g to 150 ml / 100 g.

-Organic pigment-

The organic pigment is appropriately selected depending on the intended purpose without any limitation, and examples thereof include: azo pigment such as azolac, insoluble azo pigment, condensed azo pigment and chelated azo pigment; a polycyclic pigment such as phthalocyanine pigment, perylene pigment, perinone pigment, anthraquinone pigment, quinacridone pigment, dioxazine pigment, indigo pigment, thioindigin pigment, isoindoline pigment and hinophmental pigment; a chelate pigment such as a basic chelate pigment and an acid chelate pigment; and others, such as nitropigment, nitrosopigment and aniline black. They can be used individually or in combination. Among these organic pigments, azo pigment and a polycyclic pigment are preferred.

Examples of black organic pigment include: carbon black (C.I. PIGMENT BLACK 7), such as furnace black, lamp black, acetylene black and channel black; metals such as copper, iron (C.I. PIGMENT BLACK 11), and titanium oxide; and organic pigments such as aniline black (C.I. PIGMENT BLACK 1).

Examples of a colored organic pigment other than black include: C.I. PIGMENT YELLOW 1, 3, 12, 13, 14, 17, 24, 34, 35, 37, 42 (yellow oxide), 53, 55, 74, 81, 83, 95, 97, 98, 100, 101, 104, 408, 109, 110, 117, 120, 128, 138, 150, 151, 153 and 183; C.I. PIGMENT ORANGE 5, 13, 16, 17, 36, 43 and 51; C.I. PIGMENT RED 1, 2, 3, 5, 17, 22, 23, 31, 38, 48: 2, 48: 2 (steady red 2B (Ca)), 48: 3, 48: 4, 49: 1, 52: 2, 53: 1, 57: 1 (shiny carmine 6B), 60: 1, 63: 1, 63: 2, 64: 1, 81, 83, 88, 101 (red ocher), 104, 105, 106, 108 (red cadmium), 112, 114, 122 (quinacridone magenta), 123, 146, 149, 166, 168, 170, 172, 177, 178, 179, 185, 190, 193, 209 and 219; C.I. PIGMENT VIOLET 1 (rhodamine varnish), 3, 5: 1, 16, 19, 23 and 38; C.I. PIGMENT BLUE 1, 2, 15 (phthalocyanine blue), 15: 1, 15: 2, 15: 3 (phthalocyanine blue), 16, 17: 1, 56, 60, 63; and C.I. PIGMENT GREEN 1, 4, 7, 8, 10, 17, 18 and 36.

Specific BET surface area of the pigment is preferably from 10 m ² / g to 1500 m ² / g, more preferably 20 m ² / g to 600 m ² / g, and still more preferably 50 m ² / g to 300 m ² / g

It should be noted that the specific BET surface area of the pigment can be measured by nitrogen gas adsorption.

The BET specific surface area control method of the pigment is selected appropriately depending on the intended purpose without any limitation, and examples thereof include ball mill grinding, jet mill grinding, and ultrasonic wave processing.

As the pigment, a composite pigment can be used in which the inorganic pigment is coated with an organic pigment or carbon black.

Compound pigment

A method of manufacturing a composite pigment is appropriately selected depending on the intended purpose without any limitation, and examples thereof include: a method of precipitating an organic pigment in the presence of an inorganic pigment; and a mechanochemical method in which the inorganic pigment and organic pigment are mechanically mixed and ground.

When a composite pigment is made, a layer of an organosiloxane compound formed from polysiloxane or alkylsilane may optionally be provided between the inorganic pigment and the organic pigment in order to improve adhesion between the inorganic pigment and the organic pigment.

The organic pigment included in the composite pigment is suitably selected depending on the intended purpose without any limitation, and examples thereof include aniline black, anthraquinone pigment, phthalocyanine blue, phthalocyanine green, diazopigment, monoazopigment, pyrantrone pigment, perylene pyrene yellow, quinacridone pigment and (thio) indigo pigment. Among them, carbon black, phthalocyanine-based pigment, quinacridone-based pigment, monoazo-yellow-based pigment, diazo-yellow-based pigment and heterocyclic yellow-based pigment are preferred, taking into account image density.

Examples of phthalocyanine blue include copper phthalocyanine blue and its derivatives (C.I. PIGMENT BLUE 15: 3, 15: 4), and aluminum phthalocyanine.

Examples of the quinacridone pigment include C.I. PIGMENT ORANGE 48, C.I. PIGMENT ORANGE 49, C.I. PIGMENT RED 122, C.I. PIGMENT RED 192, C.I. PIGMENT RED 202, C.I. PIGMENT RED 206, C.I. PIGMENT RED 207, C.I. PIGMENT RED 209, C.I. PIGMENT VIOLET 19 and C.I. PIGMENT VIOLET 42.

Examples of monoazo yellow include C.I. Pigment Yellow 74, C.I. Pigment Yellow 109, C.I. Pigment Yellow 128 and C.I. Pigment Yellow 151.

Examples of diazo yellow include C.I. Pigment Yellow 14, C.I. Pigment Yellow 16 and C.I. Pigment Yellow 17.

Examples of heterocyclic yellow include C.I. Pigment Yellow 117 and C.I. Pigment Yellow 138.

The inorganic pigment included in the composite pigment is suitably selected depending on the intended purpose without any limitation, and examples thereof include titanium dioxide, silica, alumina, iron oxide, iron hydroxide and tin oxide.

The inorganic pigment included in the composite pigment is preferably spherical particles.

In the case where an organic pigment of a color other than black is precipitated onto an inorganic pigment, the color of the inorganic pigment included in the composite pigment is preferably light or white. In the case where a black organic pigment or carbon black is deposited on the surface of the inorganic pigment particles, the color of the inorganic pigment included in the composite pigment may be black.

The average primary particle diameter of the inorganic pigment included in the composite pigment is preferably 100 nm or less, more preferably 5 nm to 50 nm.

The mass ratio of the organic pigment or carbon black to the inorganic pigment in the composite pigment is preferably from 1/3 to 3, more preferably from 2/3 to 2. When the mass ratio is less than 1/3, a sufficient image density cannot be achieved. When their mass ratio is more than 3, the desired transparency and color tone may not be achieved.

Examples of a commercial product composite pigment include silica / carbon black composite, silica / phthalocyanine composite PB15: 3, silica / diazo yellow composite and PR122 silica / quinacridone composite (all from TODA KOGYO CORPORATION).

The amount of pigment in an ink jet ink is preferably from 1% by mass to 15% by mass, more preferably from 2% by mass to 10% by mass. When its amount is less than 1% by mass, a sufficient image density cannot be achieved. When its amount is more than 15% by weight, the stability of the output of the resulting ink may be impaired.

<< Self-dispersing pigment >>

The self-dispersing pigment is suitably selected depending on the intended purpose without any restriction, provided that it is a pigment whose surface of each of the particles is modified by binding of at least one hydrophilic group directly or via another atomic group to the surface of the particle, and it can be dispersed in a stable manner without a dispersant.

The volumetric average particle diameter (D ₅₀ ) of the self-dispersing pigment is preferably from 0.01 μm to 0.16 μm.

With respect to the self-dispersing pigment, it is preferred that the anionic group or cationic group is introduced into the surface of each particle.

-Anionic group-

The anionic group is selected suitably depending on the intended purpose without any restriction, and examples thereof include groups represented by the following formulas: -COO ^- M ^+, -SO ₃ ^- M ^+, -PO ₃ H ^- M ^+, and - PO ₃ ^2- M ⁺ ₂ (where M ⁺ is a proton, an alkali metal ion, an ammonium ion or an organic ammonium ion).

An alkali metal ion for M ⁺ is selected suitably depending on the intended purpose without any restriction, and examples thereof include lithium ion, sodium ion and potassium ion.

The organic ammonium ion for M ^{+ is} selected appropriately depending on the intended purpose without any limitation, and examples thereof include mono-, di- or trimethylammonium ion, mono-, di- or triethylammonium ion and mono-, di- or trimethanolammonium ion .

The method of introducing the anionic group into the surface of each pigment particle is selected appropriately depending on the intended purpose without any limitation, and examples thereof include: a method in which the pigment is subjected to oxidative treatment with sodium hypochlorite; pigment sulfonation process; and a method in which the pigment is allowed to react with a diazonium salt.

-Cationic group-

The cationic group is suitably selected depending on the intended purpose without any limitation, and examples thereof include a combination of a quaternary ammonium group represented by any of the formulas below with a counterion.

As a self-dispersing pigment, carbon black can be used in which a cationic group has been introduced into the surface of its particles.

The method of introducing a cationic group into the surface of each of the carbon black particles is suitably selected depending on the intended purpose without any limitation, and examples thereof include a method in which carbon black is surface-treated with 3-amino-N-ethylpyridiium bromide.

In a self-dispersing pigment, an ionic group can be bonded to its surface via another atomic group.

-Other atomic group-

The above other atomic group is suitably selected depending on the intended purpose without any limitation, and examples thereof include a C1-C12 alkyl group, a phenyl group which may be substituted with a substituent, and a naphthyl group which may be substituted with a substituent.

An ionic group bonded by the above other atomic group is suitably selected depending on the intended purpose without any limitation, and examples thereof include groups represented by the following formulas:

−CH ₂ CH ₂ COO ^- M ⁺

(where M ⁺ is an alkali metal ion or quaternary ammonium ion)

−R − SO ₃ ^- M ⁺

(where R represents a phenylene group, and M ⁺ represents an alkali metal ion or quaternary ammonium ion).

The heminal bisphosphonic group or the heminal group of the bisphosphonic acid salt is preferably introduced into the surface of each of the particles of self-dispersing pigment. As a result of this modification, the stability of the output of the resulting ink can be ensured.

<< Agent for dispersing pigment >>

The pigment dispersion agent is preferably an anionic surfactant or a nonionic surfactant having a hydrophilic lipophilic balance (HLB) of from 10 to 20.

Anionic surfactant

The anionic surfactant is suitably selected depending on the intended purpose without any limitation, and examples thereof include a salt of acetic acid polyoxyethylene alkyl ester, ammonium alkyl benzene sulfonate, sodium alkyl benzene sulfonate, calcium alkyl benzene sulfonyl sulfonyl di-sulfonated di-ammonium di-sulfonyl di-sulfonated di-ammonium di-sulfonated sodium salt of condensate of naphthalenesulfonate and formalin, ammonium salt of chamois acid ester polioksietilenpolitsiklicheskogo fenilefira, sodium sulfate polioksietilenpolitsiklicheskogo fenilefira ester, salt of lauric acid, polioksietilenalkilefirsulfatnuyu salt and the salt of oleic acid. They can be used individually or in combination. Among them, sodium dioctyl sulfosuccinate and ammonium polyoxyethylene styrene phenyl ether sulfonate are preferred.

Non-ionic surfactant having a hydrophilic lipophilic balance (HLB) of 10 to 20

A nonionic surfactant having a hydrophilic lipophilic balance (HLB) of 10 to 20 is suitably selected depending on the intended purpose without any limitation, and examples thereof include polyoxyethylene alkyl ether, polyoxyalkylene alkyl ether, polyoxyethylene polycyclic phenylester, sorbitol ester and fatty acid, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene alkyl phenyl ether, polyoxyethylene alkyl amine, polyoxyethylene alkyl amide and acetylene glycol. They can be used individually or in combination. Among them, polyoxyethylene lauryl ether, polyoxyethylene β-naphthyl ether, polyoxyethylene sorbitan monooleate and polyoxyethylene styrene phenyl ether are preferred.

When the pigment is dispersed using the pigment dispersing agent, the weight ratio of the pigment dispersing agent to the pigment is preferably from 0.01 to 1, more preferably from 0.10 to 0.50. When the mass ratio is less than 0.01, the fineness of the pigment may be low. When their mass ratio is more than 1, dye leakage can occur.

The method of dispersing the pigment when using the agent for dispersing the pigment is selected appropriately depending on the intended purpose without any limitation, and examples thereof include a method in which the agent for dispersing the pigment is dissolved in water, followed by adding and dispersing the pigment therein.

The device used to disperse the pigment is selected appropriately depending on the intended purpose without any limitation, and examples thereof include: a high-speed mixer, such as a homogenizer; a ball dispersant, such as a bead mill and a ball mill; a kneading dispersant using shear, such as a roller spray gun; and ultrasonic dispersant.

It should be noted that it is preferable that after dispersing the pigment, coarse particles are removed by means of a filter or centrifuge, if necessary.

When the pigment is dispersed using a pigment dispersing agent, the volume average particle diameter (D ₅₀ ) of the pigment in water is preferably 150 nm or less, more preferably 100 nm or less. When the volumetric average particle diameter thereof (D ₅₀ ) is greater than 150 nm, the stability of the output of the resulting ink may be impaired.

The pigment dispersant is preferably used in combination with a water-soluble resin. The use of a water-soluble resin in combination with a pigment dispersing agent can improve the stability of the pigment dispersion.

- Water soluble resin -

The water-soluble resin is suitably selected depending on the intended purpose without any limitation, and examples thereof include a salt of a copolymer of α-olefin and maleic anhydride, a salt of a copolymer of styrene and (meth) acrylic acid, a polyurethane salt and a salt of a polyester. They can be used individually or in combination.

The copolymer of α-olefin and maleic anhydride, a copolymer of styrene and (meth) acrylic acid, a polyurethane and a polyester are neutralized when using the base in an equal amount or more, more preferably in an amount of 1.0 to 1.5 times, to improve solubility in water .

Base

The base is suitably selected for its intended purpose without any limitation, and examples thereof include: an alkali metal hydroxide such as sodium hydroxide, potassium hydroxide and lithium hydroxide; an amino alcohol such as triethanolamine, diethanolamine, N-methyldiethanolamine, 2-amino-2-ethyl-1,3-propanediol and choline; and others, such as ammonium, triethylamine and morpholine.

Examples of a copolymer of α-olefin and maleic anhydride, which is a commercial product, include T-YP110, T-YP111, T-YP112, and T-YP113 (all from SEIKO PMC CORPORATION).

Examples of a copolymer of styrene and (meth) acrylic acid, which is a commercial product, include: JC-05 (manufactured by SEIKO PMC CORPORATION); and ARUFON (registered trademark) UC-3900, ARUFON UC-3910 and ARUFON UC-3920 (all manufactured by TOAGOSEI CO., LTD.).

Examples of a commercial product polyurethane include TAKELAC (registered trademark) W-5025, TAKELAC W-6010, and TAKELAC W-5661 (all from Mitsui Chemicals, Inc.).

Examples of a commercial polyester include: NICHIGO POLYESTER (registered trademark) W-0030, NICHIGO POLYESTER W-0005S30WO and NICHIGO POLYESTER WR-961 (all manufactured by Nippon Synthetic Chemical Industry Co., Ltd.); and PESRESIN (registered trademark) A-210 and PESRESIN A-520 (manufactured by TAKAMATSU OIL  FAT CO., LTD.).

The acid number of the water-soluble resin before neutralization is preferably from 40 mgKOH / g to 400 mgKOH / g, more preferably from 60 mgKOH / g to 350 mgKOH / g. When its acid number is less than 40 mgKOH / g, the stability of the pigment dispersion may be impaired. When its acid number is greater than 400 mgKOH / g, the stability of the output of the resulting ink and the stability of the dispersion of the pigment may be impaired.

The weight average molecular weight of the water-soluble resin before neutralization is preferably 20,000 or less, more preferably 5,000 to 20,000. When its weight average molecular weight is less than 5,000, the stability of the pigment dispersion may be impaired. When its weight average molecular weight is greater than 20,000, the stability of the output of the resulting ink and the stability of the dispersion of the pigment may be impaired.

When the pigment is dispersed using a pigment dispersing agent, the weight ratio of the water-soluble resin used in combination with the pigment dispersing agent to the pigment is preferably from 0.01 to 1, more preferably from 0.05 to 0.50. When their mass ratio is less than 0.01, the stability of the pigment dispersion may be impaired. When their mass ratio is more than 1, the stability of the output of the resulting ink may be impaired.

<< Resin particles, each of which contains pigment >>

In a pigment containing resin particle, the pigment may be dispersed in the resin particle or deposited on the surface of the resin particle.

The resin included in the resin particles is suitably selected depending on the intended purpose without any limitation, and examples thereof include a vinyl resin, a polyester resin and a polyurethane resin. Among them, vinyl resin and polyester resin are preferred (see, for example, JP-A No. 2000-53897 and 2001-139849).

<Surfactant>

The surfactant is suitably selected depending on the intended purpose without any limitation, provided that it is able to improve surface distribution, and examples thereof include a fluorine-containing surfactant, a silicone surfactant, a surfactant on based on acetylene alcohol, an anionic surfactant and a nonionic surfactant. They can be used individually or in combination. Among them, a silicone surfactant, a fluorine-containing surfactant and an acetylene alcohol based surfactant are preferred.

<< Fluorine-containing surfactant >>

In a fluorine-containing surfactant, the number of carbon atoms substituted by the fluorine-containing group is preferably from 2 to 16, more preferably from 4 to 16. When the number of carbon atoms is less than 2, the desired surface distribution cannot be achieved. When the number of carbon atoms is more than 16, the stability of the output of the resulting ink may be impaired.

The fluorine-containing surfactant is suitably selected depending on the intended purpose without any limitation, and examples thereof include a fluorine-containing anionic surfactant, a fluorine-containing nonionic surfactant, a fluorine-containing amphoteric surfactant, and an oligomeric fluorine-containing surfactant . They can be used individually or in combination.

-Fluorine-containing anionic surfactant-

The fluorine-containing anionic surfactant is suitably selected depending on the intended purpose without any limitation, and examples thereof include perfluoroalkyl sulfonic acid, perfluoroalkyl sulfonic acid salt, perfluoroalkylcarboxylic acid, perfluoroalkylcarbonyl ester salt and polyfluoroalkylate sulfuric acid having a perfluoroalkyloxy group in its side chain.

The counterion of a fluorine-containing anionic surfactant is suitably selected depending on the intended purpose without any limitation, and examples thereof include lithium ion, sodium ion, potassium ion, ammonium ion, monoethanolammonium ion, diethanolammonium ion and triethanolammonium ion.

As the fluorine-containing anionic surfactant, compounds represented by the following general formulas (5) to (8) are suitably used.

General formula (5)

In the general formula (5), Rf is a mixture of fluorine-containing hydrophobic groups represented by the following structural formulas; and A is −SO ₃ ^- M ⁺ , −COO ^- M ⁺ , or −PO ₃ ^- M ⁺ , where M ⁺ is a proton, lithium ion, sodium ion, potassium ion, ammonium ion, monoethanolammonium ion, diethanolammonium ion or triethanolammonium ion.

Общая формула (6)

General formula (6)

In the general formula (6), Rf ′ represents a fluorine-containing hydrophobic group represented by the following formula; M ⁺ is a proton, lithium ion, sodium ion, potassium ion, ammonium ion, monoethanolammonium ion, diethanolammonium ion or triethanolammonium ion; n is 1 or 2; and m represents 2 − n.

In the formula above, n is an integer from 3 to 10.

Общая формула (7)

General formula (7)

In the general formula (7), Rf ′ represents the same group as Rf ′ of the general formula (6); and M ⁺ is a proton, lithium ion, sodium ion, potassium ion, ammonium ion, monoethanolammonium ion, diethanolammonium ion or triethanolammonium ion.

Общая формула (8)

General formula (8)

In the general formula (8), Rf ′ represents the same group as Rf ′ of the general formula (6); and M ⁺ is a proton, lithium ion, sodium ion, potassium ion, ammonium ion, monoethanolammonium ion, diethanolammonium ion or triethanolammonium ion.

-Fluorinated nonionic surfactant-

The fluorine-containing nonionic surfactant is suitably selected depending on the intended purpose without any limitation, and examples thereof include perfluoroalkylphosphoric acid ester, perfluoroalkyl ethylene oxide adduct and polyoxyalkylene ester having a perfluoroalkyloxy group in its side chain. Among them, a polyoxyalkylene ester having a perfluoroalkyloxy group in its side chain is preferred due to its low expandability, and the compounds represented by the following general formulas (9) to (12) are more preferred.

Общая формула (9)

General formula (9)

In the general formula (9), m is an integer from 0 to 10, and n is an integer from 0 to 40.

Общая формула (10)

General formula (10)

In the general formula (10), n is an integer from 2 to 6; m is an integer from 15 to 50; and R represents a C11-C19 alkyl group or a group represented by the following general formula.

In the general formula above, p is an integer from 2 to 6.

Общая формула (11)

General formula (11)

In the general formula (11), Rf is the same as Rf of the general formula (5); and n is an integer from 5 to 20.

Общая формула (12)

General formula (12)

In the general formula (12), Rf ′ represents the same as Rf ′ of the general formula (6); and n is an integer from 1 to 40.

The ratio of the molecular weight of the polyoxyethylene group to the molecular weight of the fluoroalkyl group in the compound represented by general formula (9) is preferably from 2.2 to 10. When their ratio is less than 2.2, or more than 10, the resulting ink may not be able to achieve the desired surface distribution.

The compound represented by general formula (10) is preferably the compounds represented by the following chemical formulas (10-1) according to (10-22), taking into account the surface distribution, more preferably the compounds represented by the chemical formulas (10-1) according to ( 10-3), and (10-14) according to (10-22).

-Fluorine-containing amphoteric surfactant-

The fluorine-containing amphoteric surfactant is preferably a compound represented by the following general formula (13).

Общая формула (13)

General formula (13)

In the general formula (13), Rf represents the same as Rf of the general formula (5).

- Oligomeric fluorine-containing surfactant -

The oligomeric fluorine-containing surfactant is preferably compounds represented by the general formulas (14) to (15).

Общая формула (14)

General formula (14)

In the general formula (14), Rf is a group represented by the following general formula:

(in the general formula above, n is an integer from 1 to 4);

A is a group represented by any of the following general formulas: −COO ^- M ⁺ , −SO ₃ ^- M ⁺ , −SO ₄ ^- M ⁺ , −PO ₄ ^- M ⁺

(in the general formulas above, M ⁺ represents an alkali metal ion (e.g., sodium ion and potassium ion), or a quaternary ammonium (e.g., triethylammonium and triethanolammonium)); and q is an integer from 1 to 6.

General formula (15)

In the general formula (15), Rf ″ represents a C2-C22 perfluoroalkyl group; m is an integer from 6 to 25; and each index of l and n independently represents an integer from 1 to 10.

Examples of a fluorine-containing surfactant that is a commercial product include: SURFLON (registered trademark) S-111, S-112, S-113, S-121, S-131, S-132, S-141, S-145 (all manufactured by AGC SEIMI CHEMICAL CO., LTD.); FLOURAD FC-93, FC-95, FC-98, FC-129, FC-135, FC-170C, FC-430, FC-431 (all manufactured by Sumitomo 3M Limited); MEGAFACE (registered trademark) F-470, F-1405, F-474 (all manufactured by DIC Corporation); ZONYL (registered trademark) TBS, FSP, FSA, FSN-100, FSN, FSO-100, FSO, FS-300, UR (all manufactured by Du Pont Co., Ltd.); FT-110, FT-250, FT-251, FT-400S, FT-150, FT-400SW (all manufactured by NEOS COMPANY LIMITED); and PolyFox (registered trademark) PF-136A, PF-156A, PF-151N, PF-154, PF-159 (manufactured by Omnova Solutions, Inc.); and UNIDYNE (registered trademark) DSN-403N (manufactured by DAIKIN INDUSTRIES, LTD.).

<< Silicone Surfactant >>

The silicone surfactant is suitably selected depending on the intended purpose without any limitation, and examples thereof include side chain modified polydimethylsiloxane, both ends modified, dimethylsiloxane modified at one end, and modified side chain and modified polydimethylsiloxane both ends. They can be used individually or in combination. Among them, a polyester modified silicone surfactant having a polyoxyethylene group and / or a polyoxyethylene-polyoxypropylene group as a modifying group is preferred.

- Polyester Modified Silicone Surfactant -

The polyester-modified silicone surfactant is preferably a compound represented by the general formula (16).

Общая формула (16)

General formula (16)

In the general formula (16), R represents an alkylene group; R ′ represents an alkyl group; and each index of m, n, a and b independently represents an integer.

Examples of a polyester-modified silicone surfactant that is a commercial product include: KF-618, KF-642, and KF-643 (all from Shin-Etsu Chemical Co., Ltd.); EMALEX-SS-5602, and SS-1906EX (all manufactured by Nihon-Emulsion Co., Ltd.); FZ-2105, FZ-2118, FZ-2154, FZ-2161, FZ-2162, FZ-2163, and FZ-2164 (all manufactured by Dow Corning Toray Co., Ltd.); BYK-33, and BYK-387 (all manufactured by BYK Japan K.K.); and TSF4440, TSF4452, and TSF4453 (all manufactured by Momentive Performance Materials Inc.).

<< Acetylene alcohol surfactant >>

Acetylene alcohol surfactant is suitably selected depending on the intended purpose without any limitation, however, the compound represented by the following chemical formula is preferred:

and compounds represented by the following general formulas (17) to (18). They can be used individually or in combination.

Общая формула (17)

General formula (17)

In the general formula (17), each index of m and n independently represents an integer.

Общая формула (18)

General formula (18)

In the general formula (18), each of R1 and R2 independently represents an alkyl group.

Examples of a surfactant based on acetylene alcohol, which is a commercial product, include: Dynol (registered trademark) 604, and Dynol 607 (both manufactured by Air Products Japan Inc.); SURFYNOL (registered trademark) 104, SURFYNOL 420, SURFYNOL 440, and SURFYNOL SE (all manufactured by Nissin Chemical Industry Co., Ltd.); and OLFINE E1004, OLFINE E1010, OLFINE EXP.4001, OLFINE EXP.4200, OLFINE EXP.4051F, and OLFINE EXP.4123 (all manufactured by Nissin Chemical Industry Co., Ltd.).

<< Anionic surfactant >>

The anionic surfactant is suitably selected depending on the intended use without any limitation, and examples thereof include the polyoxyethylene alkyl ether ester salt, dodecylbenzenesulfonic acid salt of salt, succinic acid ester salt of sulfonic acid, lauryl acid salt and polyoxyethylene alkyl sulfate salt. They can be used individually or in combination.

<< Nonionic Surfactant >>

The nonionic surfactant is suitably selected depending on the intended purpose without any limitation, and examples thereof include polyoxyethylene alkyl ether, polyoxypropylene-polyoxyethylene alkyl ether, polyoxyethylene alkyl ether, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene alkyl phenyl ether, polyoxyethylene. They can be used individually or in combination.

The amount of surfactant in inkjet ink is preferably from 0.001% by weight to 5% by weight, more preferably from 0.05 to 1% by weight. When its amount is less than 0.001% by mass, the resulting ink may not be able to achieve the desired surface distribution. When its amount is more than 5% by mass, a sufficient image density cannot be achieved with the resultant ink.

<Weter>

The wetting agent is suitably selected depending on the intended purpose without any limitation, and examples thereof include a C8-C11 polyol and a C8-C11 polyol ether. They can be used individually or in combination. A wetting agent is preferably a compound represented by the following general formula (19), and more preferably 2-ethyl-1,3-hexanediol and 2,2,4-trimethyl-1,3-pentanediol.

Общая формула (19)

General formula (19)

In the general formula (19), R ′ represents a methyl group or an ethyl group; R ″ represents a hydrogen atom or a methyl group; and R ″ ″ represents an ethyl group or a propyl group.

The wetting agent preferably has a solubility of from 0.2% by weight to 5.0% by weight in water at 25 ° C.

The solubilities of 2-ethyl-1,3-hexanediol and 2,2,4-trimethyl-1,3-pentanediol in water at 25 ° C. are 4.2% by weight and 2.0% by weight, respectively.

Other examples of the C8-C11 polyol include an aliphatic diol such as 2-ethyl-2-methyl-1,3-propanediol, 3,3-dimethyl-1,2-butanediol, 2,2-diethyl-1,3-propanediol, 2-methyl-2-propyl-1,3-propanediol, 2,4-dimethyl-2,4-pentanediol, 2,5-dimethyl-2,5-hexanediol and 5-hexene-1,2-diol.

Examples of the C8-C11 polyol ether include diethylene glycol monophenyl ether, ethylene glycol monophenyl ether, ethylene glycol mono-ethyl ester, diethylene glycol monophenyl ether, diethylene glycol monobutyl ether, and tetraphenyl glycol monobutyl ether.

Other examples of a wetting agent include a lower alcohol such as ethanol.

The amount of wetting agent in inkjet ink is preferably from 0.1% by weight to 4.0% by weight. When its amount is less than 0.1% by weight, dye leakage can occur. When its amount is more than 4.0% by mass, sufficient release stability and image density cannot be achieved.

<Other components>

Other components are selected appropriately depending on the intended use, and examples thereof include a pH adjuster, a foaming inhibitor (antifoaming agent), an antiseptic and a fungicide, a chelating agent, an anti-corrosion agent, an antioxidant and an ultraviolet absorber. They can be used individually or in combination.

<< pH Regulator >>

The pH adjuster is suitably selected depending on the intended purpose without any limitation, provided that it is capable of adjusting the pH to a range of 7 to 11. Examples thereof include an amino alcohol such as diethanolamine, triethanolamine, and 2-amino-2- ethyl 1,3-propanediol; alkali metal hydroxide such as lithium hydroxide, sodium hydroxide and potassium hydroxide; ammonium hydroxide such as ammonium hydroxide and quaternary ammonium hydroxide; phosphonium hydroxide, such as quaternary phosphonium hydroxide; and an alkali metal carbonate such as lithium carbonate, sodium carbonate and potassium carbonate. They can be used individually or in combination.

<< Foam Inhibitor >>

The foaming inhibitor is suitably selected depending on the intended purpose without any limitation, however, it is preferably a compound represented by the following general formula (20).

Общая формула (20)

General formula (20)

In the general formula (20), each of R1 and R2 independently represents a C3-C6 alkyl group; each of R3 and R4 independently represents a methyl group or ethyl group; and n is an integer from 1 to 6.

Examples of the compound represented by general formula (20) include 2,4,7,9-tetramethyldecane-4,7-diol and 2,5,8,11-tetramethyldodecane-5,8-diol. Among them, 2,5,8,11-tetramethyldodecane-5,8-diol is preferred.

The amount of foaming inhibitor in inkjet ink is preferably from 0.01% by weight to 10% by weight, more preferably from 0.1% by weight to 5% by weight. When its amount is less than 0.01% by mass, the effect of inhibiting foaming cannot be achieved. When its amount is more than 10% by mass, the stability of the output of the resulting ink may be impaired.

<< Antiseptic and fungicide >>

The antiseptic and fungicide are suitably selected depending on the intended purpose without any limitation, and examples thereof include sodium dehydroacetate, sodium sorbate, sodium 2-pyridinethiol-1-oxide, sodium benzoate and sodium pentachlorophenol. They can be used individually or in combination.

<< Chelating reagent >>

The chelating reagent is suitably selected depending on the intended purpose without any limitation, and examples thereof include sodium ethylenediamine tetraacetate, sodium nitrilotriacetate, sodium hydroxyethylethylenediamine triacetate, sodium diethylene triamine pentaacetate, sodium uramyl diacetate. They can be used individually or in combination.

<< Anticorrosive additive >>

The anticorrosion additive is suitably selected depending on the intended purpose without any limitation, and examples thereof include acid sulfite salt, sodium thiosulfate, ammonium thiodiglycolate, diisopropylammonium nitrite, pentaerythritol tetranitrate and dicyclohexylammonium nitrite. They can be used individually or in combination.

<< Antioxidant >>

The antioxidant is appropriately selected for its intended purpose without any limitation, and examples thereof include: a phenolic antioxidant such as butylated hydroxyanisole, 2,10-di-tert-butyl-4-ethylphenol, stearyl-β- (3,5 di-tert-butyl-4-hydroxyphenyl) propionate, 2,2′-methylenebis (4-methyl-10-tert-butylphenol), 2,2′-methylenebis (4-ethyl-10-tert-butylphenol), 4 , 4′-butylidenebis (3-methyl-10-tert-butylphenol), 3,9-bis [1,1-dimethyl-2- [β- (3-tert-butyl-4-hydroxy-5-methylphenyl) propionyloxy ] ethyl] 2,4,8,10-tetraoxaspiro [5.5] undecane, 1,1,3-tris (2-methyl-4-hydroxy-5-tert-b tilphenyl) butane, 1,3,5-trimethyl-2,4,10-tris (3,5-di-tert-butyl-4-hydroxybenzyl) benzene and tetrakis [methylene-3- (3 ′, 5′-di tert-butyl-4′-hydroxyphenyl) propionate] methane; amine antioxidant such as phenyl-β-naphthylamine, α-naphthylamine, N, N′-di-sec-butyl-p-phenylenediamine, phenothiazine, N, N′-diphenyl-p-phenylenediamine, 2,10-di-tert -butyl-p-cresol, 2,10-di-tert-butylphenol, 2,4-dimethyl-10-tert-butylphenol, butylhydroxyanisole, 2,2′-methylenebis (4-methyl-10-tert-butylphenol), 4 , 4′-butylidenebis (3-methyl-10-tert-butylphenol), 4,4′-thiobis (3-methyl-10-tert-butylphenol), tetrakis [methylene-3 (3,5-di-tert-butyl -4-dihydroxyphenyl) propionate] methane and 1,1,3-tris (2-methyl-4-hydroxy-5-tert-butylphenyl) butane; a sulfur-containing antioxidant such as dilauryl-3,3′-thiodipropionate, distearylthiodipropionate, laurylstearylthiodipropionate, dimyristyl-3,3′-thiodipropionate, distearyl-β, β′-thiodipropionate, 2-mercaptobenzoylamidazole and and a phosphorus-containing antioxidant antioxidant such as triphenyl phosphate, octadecyl phosphate, triisodecyl phosphate, trilauryl trithiophosphate and trinonyl phenyl phosphate. They can be used individually or in combination.

<< UV absorber >>

The ultraviolet absorber is appropriately selected for its intended purpose without any limitation, and examples thereof include a benzophenone ultraviolet absorber such as 2-hydroxy-4-n-octoxybenzophenone, 2-hydroxy-4-n-dodecyloxybenzophenone, 2 4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone and 2,2 ′, 4,4′-tetrahydroxybenzophenone; a benzotriazole ultraviolet absorber such as 2- (2′-hydroxy-5′-tert-octylphenyl) benzotriazole, 2- (2′-hydroxy-5′-methylphenyl) benzotriazole, 2- (2′-hydroxy-4′- octoxyphenyl) benzotriazole and 2- (2′-hydroxy-3′-tert-butyl-5′-methylphenyl) -5-chlorobenzotriazole; a salicylate ultraviolet absorber such as phenyl salicylate, p-tert-butyl phenyl salicylate, and p-octyl phenyl salicylate; a cyanoacrylate ultraviolet absorber such as ethyl 2-cyano-3,3′-diphenylacrylate, methyl 2-cyano-3-methyl-3- (p-methoxyphenyl) acrylate and butyl-2-cyano-3-methyl-3 - (p-methoxyphenyl) acrylate; and an ultraviolet absorber based on a complex nickel salt, such as nickelbis (octylphenyl) sulfide, 2,2′-thiobis (4-tert-octylferrate) n-butylamine nickel (II), 2,2′-thiobis (4-tert nickel (II) octylferrate) -2-ethylhexylamine and nickel (II) triethanolamine (4-tert-octylferrate) triethanolamine. They can be used individually or in combination.

<Physical Properties of Inkjet Ink>

The viscosity of inkjet inks at 25 ° C is preferably from 5 MPa · s to 25 MPa · S. When their viscosity is lower than 5 MPa · s, a sufficient image density cannot be achieved. When their viscosity is higher than 25 MPa · s, the stability of the output of the resulting ink may be impaired.

The viscosity of inkjet inks at 25 ° C can be measured with a RE-550L viscometer (manufactured by Toki Sangyo Co., Ltd.).

The pH of inkjet inks at 25 ° C is preferably from 4 to 12, and taking into account miscibility with a water-dispersible coloring agent, more preferably from 6 to 11, even more preferably from 7 to 10. When the pH of the ink is lower than 4 or higher than 12, the dispersion state of the water-dispersible resin may be impaired, or their molecular chains may be split due to hydrolysis or the like.

The pH of inkjet inks at 25 ° C can be measured using a HM-30R pH meter (manufactured by DKK-TOA CORPORATION).

The static surface tension of inkjet ink at 25 ° C is preferably 30 mN / m or less, more preferably 28 mN / m or less. When the static surface tension is greater than 30 mN / m, foaming may occur.

The dynamic surface tension of inkjet ink with a surface lifetime of 15 ms when measured by determining the maximum bubble pressure is preferably 35 mN / m or less, more preferably 33 mN / m or less. When the dynamic surface tension of the ink is greater than 35 mN / m, foaming may occur when an image having a large amount of ink jet applied is formed on a sheet for printing commercial products.

The dynamic surface tension of inkjet ink with a surface lifetime of 15 ms when measured by determining the maximum bubble pressure can be measured by SITA DynoTester (manufactured by SITA Messtechnik GmbH).

<Method for manufacturing inkjet ink>

Inkjet inks can be made by dispersing or dissolving in water a composition containing a water-dispersible coloring agent, a surfactant, a wetting agent, a water-dispersible resin, a polyhydric alcohol having an equilibrium moisture content of 30% by weight or more at 23 ° C and relative humidity ( RH) 80%, a compound represented by general formula (1), and at least one compound selected from the group consisting of compounds represented by general formulas (2) to (4), and optionally others Components.

A device for dispersing or dissolving the composition in water is suitably selected depending on the intended purpose without any limitation, and examples thereof include a sand mill, a homogenizer, a ball mill, a vibratory mixer and an ultrasonic disperser.

In the manufacturing process of inkjet ink, mixing and mixing may optionally be carried out by means of an agitator having an agitating blade, a magnetic agitator or a high speed dispersant.

(Inkjet Printing Device)

An inkjet device is an apparatus comprising an inkjet head configured to produce inkjet ink, and may further comprise other units, if necessary.

The inkjet printing system of the present invention is suitably selected depending on the intended purpose without any limitation, and examples thereof include a system for scanning heads and a system for using heads that are arranged in a line.

<Inkjet Head>

The inkjet head is configured to apply a stimulating effect (energy) to the inkjet ink and to release inkjet ink to thereby form an image on the print medium.

The ink jet head is appropriately selected depending on the intended purpose without any limitation, and examples thereof include a piezoelectric ink jet head that uses a piezoelectric element configured to apply pressure to the ink in the ink channel to deform the oscillating plate included in the wall of the ink channel, so that the internal volume of the ink channel is changed to release ink droplets (see JP-A No. 02-51734); a thermal inkjet head that uses a fuel resistor to heat ink in the ink channel to form bubbles (see JP-A No. 61-59911); and an electrostatic inkjet head in which the vibration plate included in the ink channel wall and the electrode are located opposite each other, the electrostatic force generated between the vibration plate and the electrode deforms the vibration plate, so that the internal volume of the ink channel changes, to dispense ink droplets (see JP-A No. 10-71882).

The inkjet printing apparatus may further comprise a dryer to dry the printing medium on which the image has been formed.

The dryer is suitably selected depending on the intended purpose without any limitation, and examples thereof include an infrared dryer, a microwave dryer, a roller heater, a drum heater, and a hot air heater.

The inkjet device may further comprise a fixing unit configured to capture an image formed on the printing medium.

The fixing assembly is suitably selected depending on the intended purpose without any limitation, and examples thereof include a roller heater having a mirror heating surface and a drum heater having a mirror heating surface.

Preferably, the surface of the printing medium on which the image was formed is brought into contact with the mirror surface (smooth surface) of the roller heater or drum heater and heated to a range of 100 ° C to 150 ° C. As a result of this, the glossiness of the image can be improved.

Inkjet ink is preferably housed in a container, such as an ink cartridge.

The printing medium is selected appropriately depending on the intended purpose without any limitation, and examples thereof include uncoated paper, glossy paper, special paper, fabric, film, an OHP projector sheet and a sheet for printing commercial products. Among them, a sheet for printing commercial products is preferred since it has excellent glossiness and is capable of preventing wrinkling and foaming from occurring even when an image having a large amount of ink jet ink is applied thereon.

A sheet for printing commercial products is a printing medium in which a coating layer is formed on the base.

The amount of clean water transferred to the surface of the sheet for printing commercial products, which provides a coating layer, is preferably from 1 ml / m ² to 35 ml / m ² , more preferably from 1 ml / m ² to 10 ml / m ² and still more preferably from 2 ml / m ² to 10 ml / m ² , with a contact duration of 100 ms. When the transferred amount is less than 1 ml / m ² , foaming may occur when an image is formed having a large amount of ink jet applied. When the transferred amount is more than 35 ml / m ² , the image density may be low when an image having a large amount of ink jet applied is formed.

The amount of pure water transferred onto the sheet surface for commercial printing, wherein the provided coating layer is preferably from 3 ml / m ² to 40 ml / m ² at the contacting duration of 400 ms.

It should be noted that the amount of clean water transferred to the surface of the sheet for printing commercial products, which provides a coating layer, can be measured using a dynamic scanning absorber K350 D-type (manufactured by Kyowa Co., Ltd.). In addition, the amount of transferred pure water with a contact duration of 100 ms can be determined by interpolating the measured quantities of quantities of transferred pure water for adjacent contact durations.

Examples of a sheet for printing commercial products being a commercial product include: Ricoh Business Cogloss 100 (manufactured by Ricoh Company Limited); OK Top Coat +, OK Kanefuji +, SA Kanefuji + (all manufactured by Oji Paper Co., Ltd.); Super MI Dull, Aurora Coat, Space DX (all manufactured by Nippon Paper Co., Ltd.); α Mat, and Mu Coat (all from Hokuetsu Paper Mills, Ltd.); RAICHOU ART, and RAICHOU SUPER ART (all manufactured by Chuetsu Pulp & Paper Co., Ltd.); Pearl Coat N (manufactured by Mitsubishi Paper Mills, Ltd.).

Schematic diagrams (explanatory drawings) illustrating an example of an image forming apparatus in accordance with this invention are shown in FIG. 1 and 2.

An image forming apparatus (may also be referred to as an “inkjet printing apparatus” later in this document), illustrated in FIG. 1, comprises a device body 101, a paper feed tray 102 for feeding paper loaded into the device body 101, an paper exit tray 103 for stacking paper loaded in the device body 101 and subjected to printing (imaging) of the image, and a compartment 104 for loading an ink cartridge. On the upper side of the ink cartridge loading compartment 104, a control panel 105, such as a control button and an indicator, is located. The ink cartridge loading compartment 104 is provided with a front cover 115 that can open and close to remove and load the ink cartridge 200. In FIG. 1, 111 indicates a top cover, and 112 indicates a front face cover. Instead of, or in addition to, the ink cartridge 200, a cartridge may be installed to hold the liquid for subsequent processing in order to discharge the liquid for the subsequent processing.

In the device body 101, as illustrated in FIG. 2, the carriage 133 is slidably supported in the main scanning direction by a guide rod 131 and a stand 132, which are guide elements mounted between side plates (not shown). Scanning is performed by a main scanning engine (not shown).

In the carriage 133, there is a print head 134 including four ink jet heads that dispense ink droplets for printing the respective colors, yellow (Y), cyan (C), magenta (M), and black (Bk), so that there are several holes for ink discharge are arranged in a direction intersecting with the main scanning direction, and the ink droplet discharge direction is turned down.

As the inkjet head included in the print head 134, an inkjet head can be used that includes a piezoelectric drive, such as a piezoelectric element, a thermal drive that uses phase conversion due to boiling of a liquid film by using a unit for direct conversion of electrical energy to heat, such as a heating resistive element, a metal-based drive with a memory effect that uses a metal phase transition after your temperature changes, an electrostatic drive that uses electrostatic power, or the like. as a node for generating energy, to produce ink for printing.

In addition, the carriage 133 is provided with an auxiliary tank 135 for each color to supply ink of each color to the print head 134. The auxiliary tank 135 is supplied and replenished with the printing ink of the present invention from the ink cartridge 200, which is loaded into the cartridge loading compartment 104 with ink, through a tube for supplying ink for printing (not shown).

At the same time, as the paper feed unit for feeding paper 142 arranged on the paper loading section (leveling pressure plate) 141 of the paper feeding tray 103, a sickle-shaped roller (paper feeding roller 143) is provided that feeds the paper 142 individually sheet by sheet from the paper loading section 141, and a brake pad 144 made of a material with a high coefficient of friction that faces the paper feed roller 143. This brake pad 144 is mounted so that it is pressed against the paper feed roller 143.

As the conveying unit for moving paper 142 fed from this paper supply unit below the print head 134, a conveyor belt 151 is provided to electrostatically hold and transport the paper 142, a support roller 152 to move the paper 142 fed from the paper supply section through the guide element 145, by introducing paper 142 between the support roller 152 and the conveyor belt 151, a guide member 153 for movement to change the direction of the paper 142, fed approximately vertically upward section for feeding paper, at an angle of about 90 °, and allow the paper 142 to be stretched along the conveyor belt 151, and the end pinch roller 155, pressed against the surface of the conveyor belt 151 by the clamping element 154. In addition, provided is a charging roller 156, which is an electrification batcher to charge the surface of the conveyor belt 151.

The conveyor belt 151 is an endless belt. The conveyor belt 151 is tensioned between the conveyor roller 157 and the tension roller 158 and can move in a circle in the direction of movement of the belt. This conveyor belt 151 has a surface layer formed of resin (without resistance regulation) having a thickness of about 40 μm, for example, a tetrafluoroethylene-ethylene copolymer (ETFE), which serves as a paper holding surface, and a back layer (layer resistant to the medium, a grounded layer), the resistance of which is regulated by carbon, and which is made of the same material that is used in the surface layer. A guide member 161 corresponding to the print area by the print head 134 is located on the back of the conveyor belt 151. As a paper release unit, to release the paper 142 printed by the print head 134, a separating finger 171 is provided to separate the paper 142 from the conveyor tape 151, a paper eject roller 172 and a paper eject roller 173, and a paper exit tray 103 is located below the paper eject roller 172.

The two-sided paper feed unit 181 is removably mounted on the back of the device body 101. The paper feed unit 181 receives paper 142 returned by reverse rotation of the conveyor belt 151, flips the paper 142, and feeds the paper 142 again between the platen roller 152 and the conveyor belt 151. The paper feed section 182 is located on the upper side of the paper feed unit 181.

In this inkjet device, paper 142 is fed individually sheet by sheet from the paper feed section. Then, paper 142, fed approximately vertically upward from the paper feed section, is guided by the guide member 145 and moves when placed between the conveyance belt 151 and the support roller 152. In addition, the end of the paper 142 is guided by the guide element 153 to move and is pressed against the conveyor belt 151 by the end pinch roller 155. Then the direction of movement of the paper 142 changes at an angle of about 90 °.

In this case, the conveyor belt 157 is charged by the charging roller 156, and therefore the paper 142 is moved in a state in which the paper 142 is electrostatically held by the conveyor belt 151. By actuating the print head 134 in accordance with the image signals while moving the carriage 133, ink droplets are released to the stopped paper 142, and one line is printed. After transferring paper 142, the following line is printed to some extent. When a print completion signal or a signal that the end of paper 142 is reaching the print area is received, the print operation is completed and paper 142 is discharged into the paper exit tray 103.

When it is determined that the residual amount of ink for printing inside the auxiliary tank 135 is close to the end, the required amount of ink for printing is added from the ink cartridge 200 to the auxiliary tank 135.

In this inkjet device, when the ink for printing in the ink cartridge 200 is used up, the ink cartridge body 200 can be disassembled and only the inner ink bag can be replaced. In addition, the ink cartridge 200 can supply ink for printing in a stable manner even when the ink cartridge 200 is arranged vertically and has a front loading structure. Therefore, even when the installation is performed in a state in which the space on the upper side of the device case 101 is limited, for example, when the device case 101 is placed in the rack, or objects are placed on the upper side of the device case 101, the ink cartridge 200 can be easily replaced.

Here, descriptions have been provided for a case in which a sequential type (shuttle type) ink jet printing apparatus is used in which the carriage scans. However, in a similar manner, a linear type inkjet printing apparatus using a line print head can be used.

Examples

Examples of the present invention will be explained later in this document, however, Examples should not be construed as limiting the scope of this invention. It should be noted that “part (s)” in the description below means “part (s) by weight” unless otherwise indicated.

[Preparation of a liquid dispersion of self-dispersible black pigment 1]

Using a Silverson mixer (Silverson) 100 g carbon black, Black Pearls (registered trademark) 1000 (manufactured by Cabot Corporation) having a BET specific surface area of 343 m ² / g and a dibutyl phthalate absorption number (DBP number) of 105 ml / 100 g, 0.1 mol of the compound represented by the following chemical formula (A) and 1 l of ultrapure ion-treated water were mixed at 6000 rpm for 30 minutes in an ambient room temperature environment.

Химическая формула (A)

Chemical formula (A)

If the pH of the resulting mixture was higher than 4, 0.1 mol of nitric acid was added. Then, a 20% by weight solution in which 0.1 mol of sodium nitrite was dissolved in ultrapure ion-treated water was added dropwise to the resulting mixture over 15 minutes, and the resulting mixture was heated to 60 ° C. with stirring and allowed to reaction interaction for 1 hour. After adjusting the pH of the mixture to 10 with an aqueous solution of sodium hydroxide and stirring the resulting mixture for 30 minutes, the mixture was subjected to ultrafiltration using ultrapure ion-treated water and a dialysis membrane. Then, the resulting mixture was dispersed using ultrasonic waves and concentrated to make a solids content of 20% by mass, thereby obtaining a liquid dispersion of self-dispersed black pigment 1. The surface treatment level of self-dispersed black pigment 1 was 0.75 mmol / g, volumetric average diameter particles (D ₅₀₎ samodispergiruemogo black pigment 1 was 120 nm, its content of sodium ions was 27868 million ^-1 and the phosphorus content thereof was 2.31% by weight.

It should be noted that the volume average particle diameter (D50) was measured using a Nanotrac UPA-EX150 particle size distribution analyzer (manufactured by Nikkiso Co., Ltd.). In addition, the content of sodium ions was measured using an IM-32P ionomer (manufactured by DKK-TOA CORPORATION), and the phosphorus content was measured by elemental analysis.

[Preparation of a dispersion solution of self-dispersible black pigment 2]

500 g of carbon black, Black Pearls 880 (manufactured by Cabot Corporation), having a BET specific surface area of 220 m ² / g and dibutyl phthalate absorption number (DBP number) were loaded into a ProcessAll 4HV mixer (4 L) (manufactured by Processall Inc.) 105 ml / 100 g, 1 l of ultrapure ion-treated water and 1 mol of the compound represented by the chemical formula (A), followed by stirring and heating the mixture to 60 ° C to stir the mixture at 300 rpm for 10 minutes . Then, a 20% by weight solution in which 1 mol of sodium nitrite was dissolved in ultrapure ion exchange treated water was added dropwise over 15 minutes, followed by heating the mixture to 60 ° C with stirring, thereby allowing reaction reaction within 3 hours. The resulting reaction product was recovered while the reaction mixture was diluted with 750 ml of ion-exchanged ultrapure water, followed by exposure to the resulting ultrafiltration mixture using ion-exchanged ultrapure water and a dialysis membrane. Then, the resulting mixture was dispersed using ultrasonic waves and concentrated to make a solid content of 20% by mass, thereby obtaining a liquid dispersion of self-dispersible black pigment 2. The surface treatment level of self-dispersible black pigment 2 was 0.5 mmol / g, volumetric average diameter particles (D ₅₀₎ 2 samodispergiruemogo black pigment was 104 nm, its content of sodium ions was 19940 million ^-1 and the phosphorus content thereof was 2.20% by weight.

[Preparation of a dispersion solution of self-dispersible black pigment 3]

500 g of Black Pearls 880, 1 l of ultrapure ion-exchanged water and 0.175 mol of the compound represented by the following chemical formula (B) were charged into a ProcessAll 4HV mixer (4 L), followed by stirring and heating to 60 ° C to mix the mixture at 300 rpm for 10 minutes. Then, a 20% by mass solution in which 0.175 mol of sodium nitrite was dissolved in ultrapure ion-treated water was added dropwise over 15 minutes, followed by heating the mixture to 60 ° C with stirring, thereby allowing reaction reaction within 3 hours.

Химическая формула (B)

Chemical formula (B)

The resulting reaction product was recovered while the reaction mixture was diluted with 750 ml of ion-exchanged ultrapure water, followed by exposure to the resulting ultrafiltration mixture using ion-exchanged ultrapure water and a dialysis membrane. Then, the resulting mixture was dispersed using ultrasonic waves and then concentrated to make a solid content of 20% by mass, thereby obtaining a liquid dispersion of self-dispersible black pigment 3. The surface treatment level of self-dispersible black pigment 3 was 0.35 mmol / g, volume average particle diameter (D ₅₀₎ samodispergiruemogo black pigment 3 was 114 nm, its content of sodium ions was 12792 million ^-1 and the phosphorus content thereof was 1.08% by weight.

[Preparation of a dispersion solution of self-dispersed magenta pigment 1]

Using a Silverson mixer, 100 g of Red 122 pigment (manufactured by Sun Chemical Corporation), 0.05 mol of the compound represented by chemical formula (B), and 1 L of ultrapure ion-treated water were mixed at 6000 rpm for 30 minutes in an environment with room temperature. Then, a 20% by weight solution in which 0.05 mol of sodium nitrite was dissolved in ultrapure water treated by ion exchange was added dropwise to the resulting mixture over 15 minutes, and the resulting mixture was heated to 60 ° C with stirring and allowed to reaction interaction for 1 hour. After adjusting the pH of the mixture to 10 with an aqueous solution of tetramethylammonium hydroxide and mixing the resulting mixture for 30 minutes, the mixture was ultrafiltered using ultrapure ion-treated water and a dialysis membrane. Then, the resulting mixture was dispersed using ultrasonic waves and concentrated to make a solid content of 20% by mass, thereby obtaining a liquid dispersion of self-dispersed magenta pigment 1. The surface treatment level of the self-dispersed magenta pigment 1 was 0.50 mmol / g, volumetric average diameter particles (D ₅₀ ) of self-dispersed magenta pigment 1 was 111 nm, and its phosphorus content was 0.26% by weight.

[Preparation of a dispersion solution of self-dispersed magenta pigment 2]

Using a Silverson mixer, 690 g of a liquid dispersion of a surface-treated Red 122 pigment having a solids content of 14.5% by weight, SMART Magenta 3122BA (manufactured by Sensient Technologies Corporation), 0.05 mol of the compound represented by chemical formula (B), and 500 ml of ultrapure ion-treated water was mixed at 6000 rpm for 30 minutes in an ambient room temperature environment. Then, a 20% by mass solution in which 0.05 mol of sodium nitrite was dissolved in ultrapure ion-treated water was added dropwise to the resulting mixture over 15 minutes, the resulting mixture was heated to 60 ° C with stirring and allowed to react interaction for 1 hour. After adjusting the pH of the mixture to 10 with an aqueous solution of tetramethylammonium hydroxide and mixing the resulting mixture for 30 minutes, the mixture was ultrafiltered using ultrapure ion-treated water and a dialysis membrane. Then, the resulting mixture was dispersed using ultrasonic waves and concentrated to make a solids content of 20% by mass, thereby obtaining a liquid dispersion of self-dispersed magenta pigment 2. The surface treatment level of self-dispersed magenta pigment 2 was 0.50 mmol / g, volumetric average diameter particles (D ₅₀ ) of self-dispersed magenta pigment 2 was 106 nm, and its phosphorus content was 0.25% by weight.

[Preparation of a dispersion solution of self-dispersible blue pigment 1]

Using a Silverson mixer, 690 g of a liquid dispersion of a surface-treated Blue 15: 4 pigment having a solids content of 14.5% by weight, SMART Cyan 3154BA (manufactured by Sensient Technologies Corporation), 0.05 mol of the compound represented by chemical formula (A) , and 500 ml of ultrapure ion-treated water was mixed at 6000 rpm for 30 minutes in an ambient room temperature environment. Then, a 20% by mass solution in which 0.05 mol of sodium nitrite was dissolved in ultrapure ion-treated water was added dropwise to the resulting mixture over 15 minutes, the resulting mixture was heated to 60 ° C with stirring and allowed to react interaction for 1 hour. After adjusting the pH of the mixture to 10 with an aqueous solution of tetramethylammonium hydroxide and mixing the resulting mixture for 30 minutes, the mixture was ultrafiltered using ultrapure ion-treated water and a dialysis membrane. Then, the resulting mixture was dispersed using ultrasonic waves and concentrated to make a solids content of 20% by mass, thereby obtaining a liquid dispersion of self-dispersed blue pigment 1. The surface treatment level of self-dispersed blue pigment 1 was 0.50 mmol / g, volumetric average diameter particles (D ₅₀₎ samodispergiruemogo blue pigment 1 was 113 nm and the content of phosphorus was 0.27% by weight.

[Preparation of a dispersion solution of self-dispersing yellow pigment 1]

Using a Silverson mixer, 690 g of a liquid dispersion of a surface-treated Yellow 74 pigment having a solids content of 14.5% by weight, SMART Yellow 3074BA (manufactured by Sensient Technologies Corporation), 0.05 mol of the compound represented by chemical formula (B), and 500 ml of ultrapure ion-treated water was mixed at 6000 rpm for 30 minutes in an ambient room temperature environment. Then, a 20% by mass solution in which 0.05 mol of sodium nitrite was dissolved in ultrapure ion-treated water was added dropwise to the resulting mixture over 15 minutes, the resulting mixture was heated to 60 ° C with stirring and allowed to react interaction for 1 hour. After adjusting the pH of the mixture to 10 with an aqueous solution of tetrabutylammonium hydroxide and stirring the resulting mixture for 30 minutes, the mixture was ultrafiltered using ultrapure ion-treated water and a dialysis membrane. Then, the resulting mixture was dispersed using ultrasonic waves and concentrated to make a solids content of 20% by mass, thereby obtaining a liquid dispersion of self-dispersing yellow pigment 1. The surface treatment level of self-dispersing yellow pigment 1 was 0.50 mmol / g, volumetric average diameter particles (D ₅₀ ) of self-dispersing yellow pigment 1 was 142 nm, and its phosphorus content was 0.26% by weight.

[Preparation of a dispersion solution of self-dispersible black pigment 4]

To 3 L of a 2.5 N sodium sulfate solution was added 90 g of carbon black having a specific adsorption surface area of CTAB (cetyltrimethylammonium bromide) of 150 m ² / g and a dibutyl phthalate absorption number (DBP number) of 100 ml / 100 g, and the resulting mixture was heated to 60 ° C with stirring at 300 rpm to thereby allow reaction for 10 hours. The resulting reaction mixture was filtered and then the filter cake was neutralized with an aqueous solution of sodium hydroxide. The resulting product was ultrafiltered using ultrapure ion-treated water and a dialysis membrane. After performing additional filtration, the filter cake was washed with ultrapure ion-treated water and then dried. Then, the dried filter cake was dispersed in ultrapure ion-treated water to make a solid content of 20% by mass, thereby obtaining a liquid dispersion of self-dispersible black pigment 4. Self-dispersible black pigment 4 had a volumetric average particle diameter (D ₅₀ ) of 103 nm .

[Preparation of a liquid dispersion of particles of resin 1 containing purple pigment]

After replacing the internal atmosphere in a 1 L flask, which was equipped with a mechanical stirrer, a thermometer, a tube for introducing nitrogen, a condenser tube and a dropping funnel, nitrogen gas, 11.2 g of styrene, 2.8 g of acrylic acid, 12.0 g were introduced lauryl methacrylate, 4.0 g of polyethylene glycol methacrylate, 4.0 g of styrene macromer and 0.4 g of mercaptoethanol, and the mixture was heated to 65 ° C. Then, a mixed solution of 100.8 g of styrene, 25.2 g of acrylic acid, 108.0 g of lauryl methacrylate, 36.0 g of polyethylene glycol methacrylate, 60.0 g of hydroxyethyl methacrylate, 36.0 g of styrene macromer, 3.6 g of mercaptoethanol, 2.4 g of azo-bis-methylvaleronitrile, and 18 g of methyl ethyl ketone were added dropwise to the flask over 2.5 hours. In addition, a mixed solution of 0.8 g of azo-bis-methylvaleronitrile and 18 g of methyl ethyl ketone was added dropwise to the flask over 0.5 hours. The resulting mixture in the flask was kept at 65 ° C for 1 hour, and then 0.8 g of azo-bis-methylvaleronitrile was added, followed by aging for an additional 1 hour. Then 364 g of methyl ethyl ketone was added to the flask to thereby obtain 800 g of a resin solution having a concentration of 50% by weight.

After mixing and stirring 28 g of resin solution, 42 g of CI Pigment RED 122, 13.6 g of 1 mol / L hydroxide aqueous solution, 20 g of methyl ethyl ketone, and 13.6 g of ion-exchange ultrapure water, the mixture was kneaded by means of rollers, in order to get pasta. The resulting paste was then added to 200 g of ion-exchanged ultrapure water, and the mixture was stirred, followed by removal of methyl ethyl ketone and water by means of an evaporator. The resulting product was subjected to pressure filtration using a polyvinylidene fluoride membrane filter having an average hole diameter of 5.0 μm to thereby obtain a liquid dispersion of resin particles 1 containing magenta pigment having a solid pigment content of 15% by mass and a solid content of 20% by mass. Particles of resin 1 containing magenta pigment had a volumetric average particle diameter (D ₅₀ ) of 127 nm.

[Preparation of a liquid dispersion of resin particles 1 containing blue pigment]

A liquid dispersion of resin particles 1 containing blue pigment was obtained in the same manner as in the preparation of a liquid dispersion of resin particles 1 containing magenta pigment, provided that CI Pigment Red 122 was replaced by CI Pigment Blue 15: 3. Particles of resin 1 containing blue pigment had a volumetric average particle diameter (D ₅₀ ) of 93 nm.

[Preparation of a liquid dispersion of yellow particles of resin 1 containing pigment]

A liquid dispersion of resin particles 1 containing yellow pigment was obtained in the same manner as in the preparation of a liquid dispersion of resin particles 1 containing magenta pigment, provided that CI Pigment Red 122 was replaced by CI Pigment Yellow 74. Resin particles 1 containing yellow pigment had a volume average particle diameter (D ₅₀₎ 76 nm.

[Preparation of a liquid dispersion of resin particles 1 containing black pigment]

The liquid dispersion of resin particles 1 containing black pigment was obtained in the same manner as in the preparation of the liquid dispersion of resin particles 1 containing magenta pigment, provided that CI Pigment Red 122 was replaced with carbon black FW100 (manufactured by EVONIK DEGUSSA JAPAN CO. LTD.). Particles of resin 1 containing black pigment had a volumetric average particle diameter (D ₅₀ ) of 104 nm.

[Preparation of yellow pigment 1 dispersed with a dispersing agent]

After dissolving 10 parts of a nonionic surfactant, NOIGEN EA-177 (polyoxyethylene styrene phenyl ether) (DAI-ICHI KOGYO SEIYAKU CO., LTD.), Having a hydrophilic lipophilic balance (HLB) of 15.7, in 60 parts of ultrapure water, treated by ion exchange, 30 parts of CI Pigment Yellow 74 (manufactured by Dainichiseika Color  Chemicals Mfg. Co., Ltd.) were added to the mixture. The mixture was then dispersed with a wet type dispersant, DYNO MILL KDL A-type (manufactured by WILLY A. BACHOFEN AG MASCHINENFABRIK) filled with 0.5 mm diameter zirconia beads for 2 hours at 2000 rpm. To it was added 4.26 parts of a water-soluble polyurethane resin, TAKELAC W-5661 (manufactured by Mitsui Chemicals, Inc.) having 35.2% by weight of the active ingredient, an acid value of 40 mgKOH / g and a weight average molecular weight of 18000, and mixed, to thereby obtain a liquid dispersion of yellow pigment 1 dispersed by a pigment dispersion agent. The volumetric average particle diameter (D ₅₀ ) of the yellow pigment 1 dispersed by the pigment dispersion agent was 62 nm.

[Preparation of Magenta Pigment 1 Dispersed with a Dispersing Agent]

After dissolving 10 parts of a nonionic surfactant, RT-100 (polyoxyethylene β-naphthyl ether) (manufactured by TAKEMOTO OIL & FAT CO., LTD.) Having a hydrophilic lipophilic balance (HLB) of 18.5, at 60 parts of ultrapure ion-treated water, 30 parts of CI Pigment Red 122 (manufactured by Dainichiseika Color Chemicals Mfg. Co., Ltd.) were added to the mixture. The mixture was then dispersed with a wet type dispersant, DYNO MILL KDL A-type (manufactured by WILLY A. BACHOFEN AG MASCHINENFABRIK) filled with 0.5 mm diameter zirconia beads for 2 hours at 2000 rpm. To it was added 7.14 parts of a water-soluble copolymer of styrene and (meth) acrylic acid, JC-05 (manufactured by SEIKO PMC CORPORATION) having 21% by weight of the active ingredient, an acid number of 170 mgKOH / g and a weight average molecular weight of 16,000, and mixed to thereby obtain a liquid dispersion of magenta pigment 1 dispersed by a pigment dispersion agent. 1 Magenta pigment dispersed pigment dispersing agent, had a volume average particle diameter (D ₅₀₎ 83 nm.

[Preparation of blue pigment 1 dispersed with a dispersing agent]

After dissolving 10 parts of a nonionic surfactant, NOIGEN EA-177 (polyoxyethylene styrene phenyl ether) (DAI-ICHI KOGYO SEIYAKU CO., LTD.), Having a hydrophilic lipophilic balance (HLB) of 15.7, in 60 parts of ultrapure water, treated by ion exchange, 30 parts of CI Pigment Blue 15: 3 (manufactured by Dainichiseika Color & Chemicals Mfg. Co., Ltd.) were added to the mixture. The mixture was then dispersed with a wet type dispersant, DYNO MILL KDL A-type (manufactured by WILLY A. BACHOFEN AG MASCHINENFABRIK) filled with 0.5 mm diameter zirconia beads for 2 hours at 2000 rpm. To it was added 5.02 parts of a water-soluble polyester, NICHIGO POLYESTER W-0030 (manufactured by Nippon Synthetic Chemical Industry Co., Ltd.) having 29.9% by weight of the active ingredient, an acid value of 100 mgKOH / g and a weight average molecular weight 7000, and mixed to thereby obtain a liquid dispersion of blue pigment 1 dispersed by a pigment dispersion agent. The blue pigment 1 dispersed by the pigment dispersion agent had a volume average particle diameter (D ₅₀ ) of 78 nm.

[Example 1]

After mixing and stirring 17.50 parts of a liquid dispersion of self-dispersing black pigment 1, 22.56 parts of POLYZOL ROY6312 (manufactured by SHOWA DENKO KK), which was an emulsion of acrylic silicone resin having a solids content of 39.9% by weight, average diameter particles of 171 nm and a minimum film formation temperature (MFT) of 20 ° C, 10.00 parts of a compound represented by the chemical formula (1-1), 10.00 parts of a compound represented by the chemical formula (3-1), 10.00 parts 3 -methoxy-N, N-dimethylpropionamide, 10.00 parts of glycerol having equal Fresh moisture 49% by weight at 23 ° C and relative humidity (RH) 80%, 2.00 parts wetting agent, which was 2-ethyl-1,3-hexanediol, 0.15 parts of the compound represented by the chemical formula (10-17 ), 0.05 parts of fungicide, which was Proxel GXL (manufactured by Arch Chemicals, Inc.), 0.60 parts of a foaming inhibitor, which was 2,4,7,9-tetramethyldecane-4,7-diol, 0.20 parts of a pH regulator, which was 2-amino-2-ethyl-1,3-propanediol, and 16.94 parts of ultrapure ion-treated water, the resulting mixture was subjected to pressure filtration using and a polyvinylidene fluoride membrane filter having an average opening diameter of 1.2 m, to thereby obtain the ink jet ink. Inkjet inks had a viscosity of 8.6 MPa · s, pH 9.7, and a dynamic surface tension of 33.9 mN / m with a surface lifetime of 15 ms when measured by determining the maximum bubble pressure.

It should be noted that ink viscosity for inkjet printing was measured at 25 ° C with a RE-550L viscometer (manufactured by Toki Sangyo Co., Ltd.). In addition, the pH of inkjet ink was measured at 25 ° C using a HM-30R pH meter (manufactured by DKK-TOA CORPORATION). In addition, the dynamic surface tension of inkjet inks with a surface lifetime of 15 ms when measured by determining the maximum bubble pressure was measured at 25 ° C. by SITA DynoTester (manufactured by SITA Messtechnik GmbH).

[Example 2]

After mixing and stirring 17.50 parts of a liquid dispersion of self-dispersing black pigment 2, 22.56 parts of POLYZOL ROY6312 (manufactured by SHOWA DENKO KK), which was an emulsion of acrylic silicone resin having a solids content of 39.9% by weight, average diameter particles of 171 nm and a minimum film formation temperature (MFT) of 20 ° C, 10.00 parts of the compound represented by the chemical formula (1-2), 10.00 parts of the compound represented by the chemical formula (3-1), 5.00 parts 3 -methoxy-N, N-dimethylpropionamide, 10.00 parts of glycerol having equal apparent humidity 49% by weight at 23 ° C and relative humidity (RH) 80%, 2.00 parts wetting agent, which was 2-ethyl-1,3-hexanediol, 0.15 parts of the compound represented by the chemical formula (10-17 ), 0.05 parts of fungicide, which was Proxel GXL (manufactured by Arch Chemicals, Inc.), 0.60 parts of a foaming inhibitor, which was 2.5.8.11-tetramethyldodecane-5.8-diol, 0.20 parts of a pH regulator, which was 2-amino-2-ethyl-1,3-propanediol, and 21.94 parts of ultrapure ion-treated water, the resulting mixture was subjected to pressure filtration using SRI polyvinylidene fluoride membrane filter having an average opening diameter of 1.2 m, to thereby obtain the ink jet ink. Inkjet inks had a viscosity of 8.5 mPa · s, a pH of 9.6, and a dynamic surface tension of 33.7 mN / m with a surface lifetime of 15 ms when measured by determining the maximum bubble pressure.

[Example 3]

After mixing and stirring 17.50 parts of a liquid dispersion of self-dispersing black pigment 3, 22.56 parts of POLYZOL ROY6312 (manufactured by SHOWA DENKO KK), which was an emulsion of acrylic silicone resin having a solids content of 39.9% by weight, average diameter particles of 171 nm and a minimum film formation temperature (MFT) of 20 ° C, 10.00 parts of the compound represented by the chemical formula (1-3), 10.00 parts of the compound represented by the chemical formula (3-1), 10.00 parts of glycerol having an equilibrium humidity of 49% by weight at 23 ° C and relates organic humidity (RH) 80%, 5.00 parts of 1,3-butanediol having an equilibrium humidity of 35% by weight at 23 ° C and relative humidity (RH) 80%, 2.00 parts of a wetting agent, which was 2-ethyl 1,3-hexanediol, 0.15 parts of the compound represented by the chemical formula (10-17), 0.05 parts of the fungicide, which was Proxel GXL (manufactured by Arch Chemicals, Inc.), 0.60 parts of the foam inhibitor, which was 2,5,8,11-tetramethyldodecane-5,8-diol, 0.20 parts of a pH regulator, which was 2-amino-2-ethyl-1,3-propanediol, and 21.94 parts of ultrapure ion-treated water result The throttling mixture was subjected to pressure filtration using a polyvinylidene fluoride membrane filter having an average hole diameter of 1.2 μm, thereby obtaining inkjet ink. Inkjet inks had a viscosity of 10.1 mPa · s, a pH of 9.4, and a dynamic surface tension of 34.6 mN / m with a surface lifetime of 15 ms when measured by determining the maximum bubble pressure.

[Example 4]

After mixing and stirring 17.50 parts of a liquid dispersion of self-dispersing magenta pigment 1, 20.05 parts of POLYZOL ROY6312 (manufactured by SHOWA DENKO KK), which was an emulsion of an acrylic silicone resin having a solids content of 39.9% by weight, average diameter particles 171 nm and a minimum film formation temperature (MFT) of 20 ° C, 10.00 parts of a compound represented by the chemical formula (1-1), 10.00 parts of a compound represented by the chemical formula (4-5), 10.00 parts 3 -methoxy-N, N-dimethylpropionamide, 15.00 parts of glycerol having equal relative humidity 49% by weight at 23 ° C and relative humidity (RH) 80%, 2.00 parts wetting agent, which was 2-ethyl-1,3-hexanediol, 2.50 parts fluorine-containing surfactant, ZONYL FS- 300 (polyoxyethylene perfluoroalkyl ether) (Du Pont Co., Ltd.) having 40% by weight of active ingredient, 0.05 parts of a fungicide which was Proxel GXL (manufactured by Arch Chemicals, Inc.), 0.40 parts of a foaming inhibitor, which was 2,5,8,11-tetramethyldodecane-5,8-diol, 0.10 parts of a pH regulator, which was 2-amino-2-ethyl-1,3-propanediol, and 12.40 parts of ultrapure With an ion-exchanged ode, the resulting mixture was subjected to pressure filtration using a polyvinylidene fluoride membrane filter having an average hole diameter of 1.2 μm to thereby produce inkjet ink. Inkjet inks had a viscosity of 8.3 mPa · s, a pH of 9.4, and a dynamic surface tension of 32.9 mN / m with a surface lifetime of 15 ms when measured by determining the maximum bubble pressure.

[Example 5]

After mixing and mixing 37.50 parts of a self-dispersible magenta pigment liquid dispersion 2, 30.00 parts of a fluorine-containing emulsion, LUMIFLON FE4300 (manufactured by ASAHI GLASS CO., LTD.) Having a solids content of 50% by weight, average particle diameter of 150 nm and a minimum film formation temperature (MFT) of 30 ° C or lower, 5.00 parts by weight of the compound represented by the chemical formula (1-1), 5.00 parts by weight of the compound represented by the chemical formula (3-1), 8.00 parts by weight of 3-methoxy-N, N-dimethylpropionamide, 10.00 parts of glycerol, having equilibrium humidity of 49% by mass at 23 ° C and relative humidity (RH) of 80%, 2.00 parts by weight of a wetting agent, which was 2.2.4-trimethyl-1,3-pentanediol, 0.10 parts of a compound, represented by the chemical formula (10-17), 0.05 parts by weight of a fungicide, which was Proxel GXL (manufactured by Arch Chemicals, Inc.), 0.40 parts of a foam inhibitor, which was 2,4,7,9-tetramethyldecane 4.7-diol, 0.10 parts of a pH adjuster, which was 2-amino-2-ethyl-1,3-propanediol, and 1.85 parts of ultrapure ion-treated water, the resulting mixture was filtered radios under pressure when using a polyvinylidene fluoride membrane filter having an average hole diameter of 1.2 microns, thereby obtaining ink for inkjet printing. Inkjet inks had a viscosity of 15.2 mPa · s, a pH of 9.2, and a dynamic surface tension of 34.8 mN / m with a surface lifetime of 15 ms when measured by determining the maximum bubble pressure.

[Example 6]

After mixing and stirring 12.50 parts of a liquid dispersion of self-dispersible blue pigment 1, 18.80 parts of POLYZOL ROY6312 (manufactured by SHOWA DENKO KK), which was an emulsion of an acrylic silicone resin having a solids content of 39.9% by weight, average diameter particles of 171 nm and a minimum film formation temperature (MFT) of 20 ° C, 10.00 parts of a compound represented by the chemical formula (1-1), 20.00 parts of a compound represented by the chemical formula (3-1), 10.00 parts 3 -methoxy-N, N-dimethylpropionamide, 10.00 parts of glycerol having equal weight humidity 49% by weight at 23 ° C and relative humidity (RH) 80%, 2.00 parts of a wetting agent, which is 2.2.4-trimethyl-1,3-pentanediol, 0.15 parts of a compound represented by the chemical formula (10-17), 0.05 parts of fungicide, which was Proxel GXL (manufactured by Arch Chemicals, Inc.), 0.60 parts of a foaming inhibitor, which was 2,4,7,9-tetramethyldecane-4,7-diol , 0.10 parts of a pH regulator, which was 2-amino-2-ethyl-1,3-propanediol, and 15.80 parts of ultrapure ion-treated water, the resulting mixture was filtered under pressure at hostname polyvinylidene fluoride membrane filter having an average opening diameter of 1.2 m, to thereby obtain the ink jet ink. Inkjet inks had a viscosity of 8.1 mPa · s, a pH of 9.5, and a dynamic surface tension of 34.6 mN / m with a surface lifetime of 15 ms when measured by determining the maximum bubble pressure.

[Example 7]

After mixing and stirring 12.50 parts of a liquid dispersion of self-dispersing yellow pigment 1, 18.80 parts of POLYZOL ROY6312 (manufactured by SHOWA DENKO KK), which was an emulsion of acrylic silicone resin having a solids content of 39.9% by weight, average diameter particles of 171 nm and a minimum film formation temperature (MFT) of 20 ° C, 10.00 parts of a compound represented by the chemical formula (1-1), 20.00 parts of a compound represented by the chemical formula (3-1), 10.00 parts 3 -methoxy-N, N-dimethylpropionamide, 10.00 parts of glycerol having equal Fresh moisture 49% by weight at 23 ° C and relative humidity (RH) 80%, 2.00 parts wetting agent, which was 2-ethyl-1,3-hexanediol, 0.15 parts of the compound represented by the chemical formula (10-17 ), 0.05 parts of fungicide, which was Proxel GXL (manufactured by Arch Chemicals, Inc.), 0.60 parts of a foaming inhibitor, which was 2.5.8.11-tetramethyldodecane-5.8-diol, 0.10 parts of a pH regulator, which was 2-amino-2-ethyl-1,3-propanediol, and 15.80 parts of ultrapure ion-treated water, the resulting mixture was subjected to pressure filtration using a polyvinylidene fluoride membrane filter having an average hole diameter of 1.2 μm, thereby obtaining ink for inkjet printing. Inkjet inks had a viscosity of 8.1 mPa · s, a pH of 9.3 and a dynamic surface tension of 34.7 mN / m with a surface lifetime of 15 ms when measured by determining the maximum bubble pressure.

[Example 8]

After mixing and stirring 10.00 parts of a self-dispersing blue pigment liquid dispersion of 1, 24.00 parts of a fluorine-containing resin emulsion, LUMIFLON FE4300 (manufactured by ASAHI GLASS CO., LTD.) Having a solids content of 50% by weight, average particle diameter of 150 nm and a minimum film-forming temperature (MFT) of 30 ° C or lower, 10.00 parts of a compound represented by the chemical formula (1-1), 10.00 parts of a compound represented by the chemical formula (3-1), 10.00 parts 3- methoxy-N, N-dimethylpropionamide, 10.00 parts of glycerol having equilibrium 49% by weight at 23 ° C and 80% relative humidity (RH), 2.00 parts wetting agent, which was 2-ethyl-1,3-hexanediol, 1.25 parts silicone surfactant modified with a polyester silicone compound KF-643 (manufactured by Shin-Etsu Chemical Co., Ltd.) having 100% by weight of active ingredient, 0.05 parts of fungicide, which was Proxel GXL (manufactured by Arch Chemicals, Inc.), 0.40 parts of inhibitor foaming, which was 2,4,7,9-tetramethyldecane-4,7-diol, 0.20 parts of a pH adjuster, which was 2-amino-2-ethyl-1,3-propanediol, and 22.10 parts of ultrapure water treated by ion exchange, the resulting mixture was subjected to pressure filtration using a polyvinylidene fluoride membrane filter having an average hole diameter of 1.2 μm to thereby obtain inkjet ink. Inkjet inks had a viscosity of 9.5 mPa · s, a pH of 9.5 and a dynamic surface tension of 32.6 mN / m with a surface lifetime of 15 ms when measured by determining the maximum bubble pressure.

[Example 9]

After mixing and stirring 7.50 parts of a liquid dispersion of self-dispersing yellow pigment 1, 30.08 parts of POLYZOL ROY6312 (manufactured by SHOWA DENKO KK), which was an emulsion of acrylic silicone resin having a solids content of 39.9% by weight, average diameter particles of 171 nm and a minimum film formation temperature (MFT) of 20 ° C, 10.00 parts of a compound represented by the chemical formula (1-1), 10.00 parts of a compound represented by the chemical formula (3-1), 10.00 parts 3 -methoxy-N, N-dimethylpropionamide, 10.00 parts of glycerol having equal apparent humidity 49% by weight at 23 ° C and relative humidity (RH) 80%, 2.00 parts wetting agent, which was 2-ethyl-1,3-hexanediol, 0.15 parts of the compound represented by the chemical formula (10-17 ), 0.05 parts of fungicide, which was Proxel GXL (manufactured by Arch Chemicals, Inc.), 0.60 parts of a foaming inhibitor, which was 2.5.8.11-tetramethyldodecane-5.8-diol, 0.10 parts of a pH regulator, which was 2-amino-2-ethyl-1,3-propanediol, and 19.52 parts of ultrapure ion-treated water, the resulting mixture was subjected to pressure filtration using SRI polyvinylidene fluoride membrane filter having an average opening diameter of 1.2 m, to thereby obtain the ink jet ink. Inkjet inks had a viscosity of 8.9 mPa · s, a pH of 9.2, and a dynamic surface tension of 31.5 mN / m with a surface lifetime of 15 ms when measured by determining the maximum bubble pressure.

[Example 10]

After mixing and stirring 17.50 parts of a liquid dispersion of self-dispersing black pigment 1, 22.56 parts of POLYZOL ROY6312 (manufactured by SHOWA DENKO KK), which was an emulsion of acrylic silicone resin having a solids content of 39.9% by weight, average diameter particles of 171 nm and a minimum film formation temperature (MFT) of 20 ° C, 10.00 parts of a compound represented by the chemical formula (1-1), 10.00 parts of a compound represented by the chemical formula (3-1), 10.00 parts 3 -methoxy-N, N-dimethylpropionamide, 10.00 parts of glycerol having equal Fresh moisture 49% by weight at 23 ° C and 80% relative humidity (RH), 2.00 parts wetting agent, which was 2-ethyl-1,3-hexanediol, 2.00 parts surfactant, SOFTANOL EP-7025 (polyoxyalkylene alkyl ether) (manufactured by Nippon Shokubai Co., Ltd.) having 100% by weight of active ingredient, 0.05 parts of fungicide, which was Proxel GXL (manufactured by Arch Chemicals, Inc.), 0.40 parts of a foaming inhibitor which was 2,4,7,9-tetramethyldecane-4,7-diol, 0.20 parts of a pH adjuster, which was 2-amino-2-ethyl-1,3-propanediol, and 15.29 parts of ultrapure ode treated by ion exchange, and the resulting mixture was subjected to filtration under pressure in the application of polyvinylidene fluoride membrane filter having an average opening diameter of 1.2 m, to thereby obtain the ink jet ink. Inkjet inks had a viscosity of 8.7 mPa · s, pH 9.1 and a dynamic surface tension of 38.2 mN / m with a surface lifetime of 15 ms when measured by determining the maximum bubble pressure.

[Example 11]

After mixing and stirring 17.50 parts of a liquid dispersion of self-dispersing black pigment 1, 22.56 parts of POLYZOL ROY6312 (manufactured by SHOWA DENKO KK), which was an emulsion of acrylic silicone resin having a solids content of 39.9% by weight, average diameter particles of 171 nm and a minimum film formation temperature (MFT) of 20 ° C, 10.00 parts of a compound represented by the chemical formula (1-1), 10.00 parts of a compound represented by the chemical formula (2-1), 10.00 parts 3 -methoxy-N, N-dimethylpropionamide, 10.00 parts of glycerol having equal a natural moisture content of 49% by weight at 23 ° C and a relative humidity (RH) of 80%, 2.00 parts of a wetting agent, which was 2-ethyl-1,3-hexanediol, 3.00 parts of a surfactant based on acetylene alcohol, SURFYNOL 104E (manufactured by Nissin Chemical Industry Co., Ltd.) having 50% by weight of active ingredient, 0.05 parts of fungicide, which was Proxel GXL (manufactured by Arch Chemicals, Inc.), 0.40 parts of a foaming inhibitor which was 2,4,7,9-tetramethyldecane-4,7-diol, 0.20 parts of a pH regulator, which was 2-amino-2-ethyl-1,3-propanediol, and 14.29 parts of ultrapure dy treated by ion exchange, and the resulting mixture was subjected to filtration under pressure in the application of polyvinylidene fluoride membrane filter having an average opening diameter of 1.2 m, to thereby obtain the ink jet ink. Inkjet inks had a viscosity of 8.8 mPa · s, a pH of 9.6, and a dynamic surface tension of 33.4 mN / m with a surface lifetime of 15 ms when measured by determining the maximum bubble pressure.

[Example 12]

After mixing and stirring 17.50 parts of a liquid dispersion of self-dispersing black pigment 1, 20.00 parts of a polyurethane emulsion, HYDRAN APX-101H (manufactured by DIC Corporation), having a solids content of 45% by weight, an average particle diameter of 160 nm and a minimum temperature film formation (MFT) 20 ° C, 10.00 parts of the compound represented by the chemical formula (1-1), 10.00 parts of the compound represented by the chemical formula (3-1), 5.00 parts of the compound represented by the chemical formula (3 -3), 10.00 parts of 3-methoxy-N, N-dimethylpropionamide, 10.00 astey glycerol having an equilibrium humidity of 49% by weight at 23 ° C and a relative humidity (RH) of 80%, 2.00 parts of a wetting agent, which was 2-ethyl-1,3-hexanediol, 1.00 parts of silicone surfactant which was a polyester-modified silicone compound KF-643 (manufactured by Shin-Etsu Chemical Co., Ltd.) having 100% by weight of the active ingredient, 0.05 parts of fungicide, which was Proxel GXL (manufactured by Arch Chemicals, Inc. ), 0.40 parts of a foaming inhibitor, which was 2,5,8,11-tetramethyldodecane-5,8-diol, 0.20 parts a pH regulator, which was 2-amino-2-ethyl-1,3-propanediol and 13.85 parts of ultrapure ion-treated water, the resulting mixture was subjected to pressure filtration using a polyvinylidene fluoride membrane filter having an average opening diameter of 1.2 μm, to thereby get ink for inkjet printing. Inkjet inks had a viscosity of 11.9 mPa · s, a pH of 9.7, and a dynamic surface tension of 34.5 mN / m with a surface lifetime of 15 ms when measured by determining the maximum bubble pressure.

[Example 13]

After mixing and mixing 23.33 parts of the particles of resin 1 containing the purple pigment, 22.56 parts of POLYZOL ROY6312 (manufactured by SHOWA DENKO KK), which was an emulsion of an acrylic silicone resin having a solids content of 39.9% by weight, average a particle diameter of 171 nm and a minimum film formation temperature (MFT) of 20 ° C, 10.00 parts of a compound represented by the chemical formula (1-1), 10.00 parts of a compound represented by the chemical formula (3-1), 10.00 parts 3-methoxy-N, N-dimethylpropionamide, 10.00 parts of glycerin having equilibrium wet 49% by weight at 23 ° C and a relative humidity (RH) of 80%, 2.00 parts of a wetting agent, which was 2-ethyl-1,3-hexanediol, 0.15 parts of a compound represented by the chemical formula (10-17) 0.05 parts of fungicide, which was Proxel GXL (manufactured by Arch Chemicals, Inc.), 0.60 parts of a foaming inhibitor, which was 2,4,7,9-tetramethyldecane-4,7-diol, 0.20 parts pH regulator, which was 2-amino-2-ethyl-1,3-propanediol, and 11.11 parts of ultrapure water treated by ion exchange, the resulting mixture was subjected to pressure filtration using polyvinyl denftoridnogo membrane filter having an average opening diameter of 1.2 m, to thereby obtain the ink jet ink. Inkjet inks had a viscosity of 15.2 mPa · s, a pH of 9.5 and a dynamic surface tension of 34.6 mN / m with a surface lifetime of 15 ms when measured by determining the maximum bubble pressure.

[Example 14]

After mixing and mixing, 16.67 parts of particles of resin 1 containing blue pigment, 18.80 parts of POLYZOL ROY6312 (manufactured by SHOWA DENKO KK), which was an emulsion of acrylic silicone resin having a solids content of 39.9% by weight, average a particle diameter of 171 nm and a minimum film formation temperature (MFT) of 20 ° C, 10.00 parts of a compound represented by the chemical formula (1-1), 20.00 parts of a compound represented by the chemical formula (3-1), 10.00 parts 3-methoxy-N, N-dimethylpropionamide, 10.00 parts of equilibrium moisture glycerin l 49% by weight at 23 ° C and a relative humidity (RH) of 80%, 2.00 parts of a wetting agent, which is 2.2.4-trimethyl-1,3-pentanediol, 0.15 parts of a compound represented by the chemical formula ( 10-17), 0.05 parts of fungicide, which was Proxel GXL (manufactured by Arch Chemicals, Inc.), 0.60 parts of a foaming inhibitor, which was 2,4,7,9-tetramethyldecane-4,7-diol, 0.10 parts of the pH regulator, which was 2-amino-2-ethyl-1,3-propanediol, and 11.64 parts of ultrapure ion-treated water, the resulting mixture was subjected to pressure filtration using irrigation nilidenftoridnogo membrane filter having an average opening diameter of 1.2 m, to thereby obtain the ink jet ink. Inkjet inks had a viscosity of 15.2 mPa · s, a pH of 9.3 and a dynamic surface tension of 34.8 mN / m with a surface lifetime of 15 ms when measured by determining the maximum bubble pressure.

[Example 15]

After mixing and mixing 16.78 parts of the yellow particles of resin 1 particles, 18.80 parts of POLYZOL ROY6312 (manufactured by SHOWA DENKO KK), which was an emulsion of acrylic silicone resin having a solids content of 39.9% by weight, average a particle diameter of 171 nm and a minimum film formation temperature (MFT) of 20 ° C, 10.00 parts of a compound represented by the chemical formula (1-1), 20.00 parts of a compound represented by the chemical formula (3-1), 10.00 parts 3-methoxy-N, N-dimethylpropionamide, 10.00 parts of equilibrium moisture glycerin 49% by weight at 23 ° C and relative humidity (RH) 80%, 2.00 parts of a wetting agent, which was 2-ethyl-1,3-hexanediol, 0.15 parts of a compound represented by the chemical formula (10-17), 0.05 parts of fungicide, which was Proxel GXL (manufactured by Arch Chemicals, Inc.), 0.60 parts of a foaming inhibitor, which was 2,5,8,11-tetramethyldodecane-5,8-diol, 0.10 parts of a regulator pH, which was 2-amino-2-ethyl-1,3-propanediol and 11.53 parts of ultrapure ion-treated water, the resulting mixture was subjected to pressure filtration using polyvinyl a denfluoride membrane filter having an average hole diameter of 1.2 μm, thereby obtaining ink for inkjet printing. Inkjet inks had a viscosity of 4.5 MPa · s, pH 9.6 and a dynamic surface tension of 34.4 mN / m with a surface lifetime of 15 ms when measured by determining the maximum bubble pressure.

[Example 16]

After mixing and mixing 23.33 parts of the particles of resin 1 containing black pigment, 22.56 parts of POLYZOL ROY6312 (manufactured by SHOWA DENKO KK), which was an emulsion of acrylic silicone resin having a solids content of 39.9% by weight, average a particle diameter of 171 nm and a minimum film formation temperature (MFT) of 20 ° C, 10.00 parts of a compound represented by the chemical formula (1-1), 10.00 parts of a compound represented by the chemical formula (3-1), 10.00 parts 3-methoxy-N, N-dimethylpropionamide, 10.00 parts of equilibrium moisture glycerin 49% by weight at 23 ° C and relative humidity (RH) 80%, 2.00 parts of a wetting agent, which was 2-ethyl-1,3-hexanediol, 0.15 parts of a compound represented by the chemical formula (10-17), 0.05 parts fungicide, which was Proxel GXL (manufactured by Arch Chemicals, Inc.), 0.60 parts of a foaming inhibitor, which was 2,4,7,9-tetramethyldecane-4,7-diol, 0.20 parts of a regulator pH, which was 2-amino-2-ethyl-1,3-propanediol, and 11.11 parts of ultrapure ion-treated water, the resulting mixture was subjected to pressure filtration using polyvinylide fluoride membrane filter having an average opening diameter of 1.2 m, to thereby obtain the ink jet ink. Inkjet inks had a viscosity of 15.1 mPa · s, a pH of 9.5 and a dynamic surface tension of 34.2 mN / m with a surface lifetime of 15 ms when measured by determining the maximum bubble pressure.

[Example 17]

After mixing and stirring 25.00 parts of a liquid dispersion of self-dispersing black pigment 4, 25.00 parts of a fluorine-containing resin emulsion, LUMIFLON FE4300 (manufactured by ASAHI GLASS CO., LTD.) Having a solids content of 50% by weight, average particle diameter of 150 nm and a minimum film formation temperature (MFT) of 30 ° C or lower, 10.00 parts of a compound represented by the chemical formula (1-1), 10.00 parts of a compound represented by the chemical formula (3-1), 10.00 parts 3 -methoxy-N, N-dimethylpropionamide, 10.00 parts of glycerol having equilibrium in 49% by weight at 23 ° C and 80% relative humidity (RH), 2.00 parts wetting agent, which was 2-ethyl-1,3-hexanediol, 0.15 parts of the compound represented by the chemical formula (10-17) 0.05 parts of fungicide, which was Proxel GXL (manufactured by Arch Chemicals, Inc.), 0.60 parts of a foaming inhibitor, which was 2,4,7,9-tetramethyldecane-4,7-diol, 0.20 parts pH regulator, which was 2-amino-2-ethyl-1,3-propanediol, and 7.00 parts of ultrapure ion-treated water, the resulting mixture was subjected to pressure filtration using poly inilidenftoridnogo membrane filter having an average opening diameter of 1.2 m, to thereby obtain the ink jet ink. Inkjet inks had a viscosity of 13.5 mPa · s, a pH of 9.5 and a dynamic surface tension of 33.6 mN / m with a surface lifetime of 15 ms when measured by determining the maximum bubble pressure.

[Example 18]

After mixing and stirring, 12.17 parts of a liquid dispersion of yellow pigment 1 dispersed with a pigment dispersing agent, 28.00 parts of a fluorine-containing resin emulsion, LUMIFLON FE4300 (manufactured by ASAHI GLASS CO., LTD.) Having a solids content of 50% by weight an average particle diameter of 150 nm and a minimum film formation temperature (MFT) of 30 ° C or lower, 10.00 parts of a compound represented by the chemical formula (1-1), 20.00 parts of a compound represented by the chemical formula (3-1), 10.00 parts of 3-methoxy-N, N-dimethylpropionamide, 10.00 parts glycerol having an equilibrium humidity of 49% by weight at 23 ° C and a relative humidity (RH) of 80%, 2.00 parts of a wetting agent, which was 2-ethyl-1,3-hexanediol, 0.15 parts of a compound represented by the chemical formula ( 10-17), 0.05 parts of fungicide, which was Proxel GXL (manufactured by Arch Chemicals, Inc.), 0.60 parts of a foaming inhibitor, which was 2,4,7,9-tetramethyldecane-4,7-diol, 0.60 parts of a foaming inhibitor, which was 2,5,8,11-tetramethyldodecane-5,8-diol, 0.10 parts of a pH regulator, which was 2-amino-2-ethyl-1,3-propanediol, and 6 , 33 parts of super of ion-exchanged treated water, the resulting mixture was subjected to pressure filtration using a polyvinylidene fluoride membrane filter having an average hole diameter of 1.2 μm to thereby obtain inkjet ink. Inkjet inks had a viscosity of 14.5 mPa · s, a pH of 9.7, and a dynamic surface tension of 33.4 mN / m with a surface lifetime of 15 ms when measured by determining the maximum bubble pressure.

[Example 19]

After mixing and stirring 17.86 parts of a purple pigment 1 dispersion liquid dispersed with a pigment dispersing agent, 20.00 parts of a fluorine-containing resin emulsion, LUMIFLON FE4300 (manufactured by ASAHI GLASS CO., LTD.) Having a solids content of 50% by weight an average particle diameter of 150 nm and a minimum film formation temperature (MFT) of 30 ° C or lower, 10.00 parts of a compound represented by the chemical formula (1-1), 10.00 parts of a compound represented by the chemical formula (3-1), 10.00 parts of 3-methoxy-N, N-dimethylpropionamide, 10.00 hours glycerol having an equilibrium humidity of 49% by weight at 23 ° C and a relative humidity (RH) of 80%, 2.00 parts of a wetting agent, which was 2-ethyl-1,3-hexanediol, 0.15 parts of a compound represented by the chemical formula (10-17), 0.05 parts of fungicide, which was Proxel GXL (manufactured by Arch Chemicals, Inc.), 0.60 parts of a foaming inhibitor, which was 2,4,7,9-tetramethyldecane-4,7-diol , 0.20 parts of a pH adjuster, which was 2-amino-2-ethyl-1,3-propanediol, and 19.14 parts of ultrapure ion-treated water, the resulting mixture was filtered pressure when using a polyvinylidene fluoride membrane filter having an average hole diameter of 1.2 μm, thereby obtaining ink for inkjet printing. Inkjet inks had a viscosity of 13.8 mPa · s, a pH of 9.7, and a dynamic surface tension of 33.2 mN / m with a surface lifetime of 15 ms when measured by determining the maximum bubble pressure.

[Example 20]

After mixing and stirring, 12.25 parts of a blue pigment liquid dispersion 1 dispersed with a pigment dispersing agent, 28.00 parts of a fluorine-containing emulsion, LUMIFLON FE4300 (manufactured by ASAHI GLASS CO., LTD.) Having a solids content of 50% by weight an average particle diameter of 150 nm and a minimum film formation temperature (MFT) of 30 ° C or lower, 10.00 parts of a compound represented by the chemical formula (1-1), 20.00 parts of a compound represented by the chemical formula (3-1), 10.00 parts of 3-methoxy-N, N-dimethylpropionamide, 10.00 parts glycerol having an equilibrium humidity of 49% by weight at 23 ° C and a relative humidity (RH) of 80%, 2.00 parts of a wetting agent, which was 2.2,4-trimethyl-1,3-pentanediol, 0.15 parts of a compound represented by the chemical formula (10-17), 0.05 parts of fungicide, which was Proxel GXL (manufactured by Arch Chemicals, Inc.), 0.60 parts of a foaming inhibitor, which was 2,4,7,9-tetramethyldecane-4 , 7-diol, 0.10 parts of a pH regulator, which was 2-amino-2-ethyl-1,3-propanediol, and 6.85 parts of ultrapure ion-treated water, the resulting mixture was subjected to tration under pressure by applying polyvinylidene fluoride membrane filter having an average opening diameter of 1.2 m, to thereby obtain the ink jet ink. Inkjet inks had a viscosity of 14.7 mPa · s, a pH of 9.8 and a dynamic surface tension of 33.2 mN / m with a surface lifetime of 15 ms when measured by determining the maximum bubble pressure.

[Comparative example 1]

After mixing and mixing 37.50 parts of a liquid dispersion of self-dispersible black pigment 1, 9.40 parts of POLYZOL ROY6312 (manufactured by SHOWA DENKO KK), which was an emulsion of acrylic silicone resin having a solids content of 39.9% by weight, average diameter particles of 171 nm and a minimum film formation temperature (MFT) of 20 ° C, 10.00 parts of a compound represented by the chemical formula (1-1), 10.00 parts of a compound represented by the chemical formula (3-1), 10.00 parts 3 -methoxy-N, N-dimethylpropionamide, 10.00 parts of glycerol having equal apparent humidity 49% by weight at 23 ° C and relative humidity (RH) 80%, 2.00 parts wetting agent, which was 2-ethyl-1,3-hexanediol, 0.10 parts of the compound represented by the chemical formula (10-17 ), 0.05 parts of fungicide, which was Proxel GXL (manufactured by Arch Chemicals, Inc.), 0.40 parts of a foaming inhibitor, which was 2,4,7,9-tetramethyldecane-4,7-diol, 0.20 parts of a pH regulator, which was 2-amino-2-ethyl-1,3-propanediol, and 10.35 parts of ultrapure ion-treated water, the resulting mixture was subjected to pressure filtration using and a polyvinylidene fluoride membrane filter having an average hole diameter of 1.2 μm, thereby obtaining ink jet ink. Inkjet inks had a viscosity of 9.9 mPa · s, a pH of 9.4, and a dynamic surface tension of 34.5 mN / m with a surface lifetime of 15 ms when measured by determining the maximum bubble pressure.

[Comparative example 2]

After mixing and stirring 37.50 parts of a liquid dispersion of self-dispersible black pigment 1, 10.00 parts of the compound represented by the chemical formula (1-1), 10.00 parts of the compound represented by the chemical formula (3-1), 10.00 parts 3 -methoxy-N, N-dimethylpropionamide, 10.00 parts of glycerol having an equilibrium humidity of 49% by weight at 23 ° C and a relative humidity (RH) of 80%, 2.00 parts of a wetting agent, which was 2-ethyl-1,3 -hexanediol, 0.10 parts of the compound represented by the chemical formula (10-17), 0.05 parts of the fungicide, which was Proxel GXL (produced Guidelines of Arch Chemicals, Inc.), 0.40 parts of a foaming inhibitor, which was 2,4,7,9-tetramethyldecane-4,7-diol, 0.20 parts of a pH adjuster, which was 2-amino-2-ethyl -1,3-propanediol and 19.75 parts of ultrapure ion-treated water, the resulting mixture was subjected to pressure filtration using a polyvinylidene fluoride membrane filter having an average hole diameter of 1.2 μm to thereby obtain inkjet ink. Inkjet inks had a viscosity of 7.2 mPa · s, a pH of 9.4, and a dynamic surface tension of 33.8 mN / m with a surface lifetime of 15 ms when measured by determining the maximum bubble pressure.

[Comparative example 3]

After mixing and stirring 17.50 parts of a liquid dispersion of self-dispersing black pigment 1, 22.56 parts of POLYZOL ROY6312 (manufactured by SHOWA DENKO KK), which was an emulsion of acrylic silicone resin having a solids content of 39.9% by weight, average diameter particles of 171 nm and a minimum film formation temperature (MFT) of 20 ° C, 10.00 parts of 3-methoxy-N, N-dimethylpropionamide, 15.00 parts of glycerol having an equilibrium humidity of 49% by weight at 23 ° C and relative humidity ( RH) 80%, 15.00 parts of 1,3-butanediol having an equilibrium moisture content of 35% by weight at 23 ° C and a relative humidity (RH) of 80%, 2.00 parts of a wetting agent, which was 2-ethyl-1,3-hexanediol, 2.00 parts of a surfactant, SOFTANOL EP-7025 (polyoxyalkylene alkyl ether) ( manufactured by Nippon Shokubai Co., Ltd.) having 100% by weight of active ingredient, 0.05 parts of fungicide, which was Proxel GXL (manufactured by Arch Chemicals, Inc.), 0.40 parts of a foaming inhibitor, which was 2, 4,7,9-tetramethyldecane-4,7-diol, 0.20 parts of a pH regulator, which was 2-amino-2-ethyl-1,3-propanediol, and 15.29 parts of ultrapure water treated with By exchange, the resulting mixture was subjected to pressure filtration using a polyvinylidene fluoride membrane filter having an average hole diameter of 1.2 μm to thereby obtain inkjet ink. Inkjet inks had a viscosity of 7.6 mPa · s, pH 9.0, and a dynamic surface tension of 38.6 mN / m with a surface lifetime of 15 ms when measured by determining the maximum bubble pressure.

[Comparative example 4]

After mixing and stirring 17.50 parts of a liquid dispersion of self-dispersing black pigment 1, 22.56 parts of POLYZOL ROY6312 (manufactured by SHOWA DENKO KK), which was an emulsion of acrylic silicone resin having a solids content of 39.9% by weight, average diameter particles of 171 nm and a minimum film formation temperature (MFT) of 20 ° C, 10.00 parts of the compound represented by the chemical formula (3-1), 10.00 parts of 3-methoxy-N, N-dimethylpropionamide, 10.00 parts of glycerol, having an equilibrium humidity of 49% by weight at 23 ° C and relative humidity (RH) 80%, 10.00 parts of 1,3-butanediol having an equilibrium humidity of 35% by weight at 23 ° C and a relative humidity (RH) of 80%, 2.00 parts of a wetting agent, which was 2-ethyl-1,3-hexanediol , 2.00 parts of a surfactant, SOFTANOL EP-7025 (polyoxyalkylene alkyl ether) (manufactured by Nippon Shokubai Co., Ltd.) having 100% by weight of active ingredient, 0.05 parts of fungicide, which was Proxel GXL (manufactured by Arch Chemicals, Inc.), 0.40 parts of a foaming inhibitor, which was 2,4,7,9-tetramethyldecane-4,7-diol, 0.20 parts of a pH regulator, which was 2-amino-2- ethyl-1,3-propanediol, and 15.29 parts of ultrapure ion-treated water, the resulting mixture was subjected to pressure filtration using a polyvinylidene fluoride membrane filter having an average hole diameter of 1.2 μm to thereby obtain inkjet ink. Inkjet inks had a viscosity of 8.4 mPa · s, a pH of 9.1, and a dynamic surface tension of 38.4 mN / m with a surface lifetime of 15 ms when measured by determining the maximum bubble pressure.

[Comparative example 5]

After mixing and stirring 17.50 parts of a liquid dispersion of self-dispersing black pigment 1, 22.56 parts of POLYZOL ROY6312 (manufactured by SHOWA DENKO KK), which was an emulsion of an acrylic silicone resin having a solids content of 39.9% by weight, average diameter particles of 171 nm and a minimum film formation temperature (MFT) of 20 ° C, 10.00 parts of the compound represented by the chemical formula (1-1), 10.00 parts of 3-methoxy-N, N-dimethylpropionamide, 10.00 parts of glycerol, having an equilibrium humidity of 49% by weight at 23 ° C and relative humidity (RH) 80%, 10.00 parts of 1,3-butanediol having an equilibrium humidity of 35% by weight at 23 ° C and a relative humidity (RH) of 80%, 2.00 parts of a wetting agent, which was 2-ethyl-1,3-hexanediol , 2.00 parts of a surfactant, SOFTANOL EP-7025 (polyoxyalkylene alkyl ether) (manufactured by Nippon Shokubai Co., Ltd.) having 100% by weight of active ingredient, 0.05 parts of fungicide, which was Proxel GXL (manufactured by Arch Chemicals, Inc.), 0.40 parts of a foaming inhibitor, which was 2,4,7,9-tetramethyldecane-4,7-diol, 0.20 parts of a pH regulator, which was 2-amino-2- ethyl-1,3-propanediol, and 15.29 parts of ultrapure ion-treated water, the resulting mixture was subjected to pressure filtration using a polyvinylidene fluoride membrane filter having an average hole diameter of 1.2 μm to thereby obtain inkjet ink. Inkjet inks had a viscosity of 8.9 mPa · s, pH 9.2, and a dynamic surface tension of 38.3 mN / m with a surface lifetime of 15 ms when measured by determining the maximum bubble pressure.

[Comparative example 6]

After mixing and stirring 10.00 parts of a self-dispersible blue pigment liquid dispersion of 1, 36.00 parts of a fluorine-containing resin emulsion, LUMIFLON FE4300 (manufactured by ASAHI GLASS CO., LTD.) Having a solids content of 50% by weight, average particle diameter of 150 nm and a minimum film-forming temperature (MFT) of 30 ° C or lower, 10.00 parts of a compound represented by the chemical formula (1-1), 10.00 parts of a compound represented by the chemical formula (3-1), 10.00 parts 3- methoxy-N, N-dimethylpropionamide, 10.00 parts of glycerol having equilibrium in ease of 49% by weight at 23 ° C and relative humidity (RH) 80%, 2.00 parts of a wetting agent, which was 2-ethyl-1,3-hexanediol, 1.25 parts of a silicone surfactant modified with a polyester silicone compound KF-643 (manufactured by Shin-Etsu Chemical Co., Ltd.) having 100% by weight of active ingredient, 0.05 parts of fungicide, which was Proxel GXL (manufactured by Arch Chemicals, Inc.), 0.40 parts of inhibitor foaming, which was 2,4,7,9-tetramethyldecane-4,7-diol, 0.20 parts of a pH regulator, which was 2-amino-2-ethyl-1,3-propanediol, 10.10 parts of ultrapure water treated by ion exchange, and the resulting mixture was subjected to filtration under pressure in the application of polyvinylidene fluoride membrane filter having an average opening diameter of 1.2 m, to thereby obtain the ink jet ink. Inkjet inks had a viscosity of 18.4 mPa · s, a pH of 9.6, and a dynamic surface tension of 34.8 mN / m with a surface lifetime of 15 ms when measured by determining the maximum bubble pressure.

[Comparative example 7]

After mixing and mixing 35.00 parts of a liquid dispersion of self-dispersing black pigment 1, 57.40 parts of a fluorine-containing emulsion, LUMIFLON FE4300 (manufactured by ASAHI GLASS CO., LTD.) Having a solids content of 45% by weight and an average particle diameter of 160 nm, and having a solids content of 50% by weight, an average particle diameter of 150 nm and a minimum film formation temperature (MFT) of 30 ° C or lower, 1.00 part of the compound represented by the chemical formula (1-1), 1.00 part the compound represented by chemical formula (3-1), 1.00 part 3 hydroxy-N, N-dimethylpropionamide, 1.00 part glycerol having an equilibrium humidity of 49% by weight at 23 ° C and a relative humidity (RH) of 80%, 1.00 part of a wetting agent, which was 2-ethyl-1,3- hexanediol, 1.25 parts of a silicone surfactant, which was a polyester-modified silicone compound KF-643 (manufactured by Shin-Etsu Chemical Co., Ltd.), having 100% by weight of the active ingredient, 0.05 parts of fungicide, which was Proxel GXL (manufactured by Arch Chemicals, Inc.), a 0.40 part foam inhibitor, which was 2,5,8,11-tetra amethyldodecane-5.8-diol, 0.20 parts of a pH regulator, which was 150-amino-2-ethyl-1,3-propanediol, and 0.70 parts of ultrapure ion-treated water, the resulting mixture was subjected to pressure filtration at using a polyvinylidene fluoride membrane filter having an average bore diameter of 1.2 μm, thereby obtaining ink jet ink. Inkjet inks had a viscosity of 14.3 mPa · s, a pH of 9.4, and a dynamic surface tension of 34.1 mN / m with a surface lifetime of 15 ms when measured by determining the maximum bubble pressure.

The physical properties of inkjet inks are presented in Table 1 above.

Table 1 The total amount of pigment and water-dispersible resin [wt.%] The mass ratio of water-dispersible resin to pigment Dynamic surface tension [mN / m] Note one 12.5 2.6 33.9 Note 2 12.5 2.6 33.7 Note 3 12.5 2.6 34.6 Note four 11.5 2,3 32.9 Note 5 22.5 2.0 34.8 Note 6 10.0 3.0 34.6 Note 7 10.0 3.0 34.7 Note 8 14.0 6.0 32.6 Note 9 9.5 8.0 31.5 Note 10 12.5 2.6 38,2 Note eleven 12.5 2.6 33,4 Note 12 12.5 2.6 34.5 Note 13 12.5 2.6 34.6 Note fourteen 10.0 3.0 34.8 Note fifteen 10.0 3.0 34,4 Note 16 12.5 2.6 34.2 Note 17 17.5 2.5 33.6 Note eighteen 17.5 4.0 33.8 Note 19 15.0 2.0 33,4 Note twenty 17.5 4.0 33,2 Comparative Example 1 11,2 0.5 34.5 Reference Example 2 7.5 0,0 33.8 Reference Example 3 12.5 2.6 38.6 Comp. example 4 12.5 2.6 38,4 Reference Example 5 12.5 2.6 38.3 Reference Example 6 20,0 9.0 34.8 Reference Example 7 35.7 4.1 34.1

In a regulated environment, where the temperature was 23 ° C ± 0.5 ° C and the relative humidity was 50% ± 5%, the excitation voltage of the piezoelectric element was changed so that the amount of ink for inkjet printing deposited on the printing medium became constant when using an inkjet printer (IPSIO GXe-5500, manufactured by Ricoh Company, Ltd.), and in addition, the print mode was set to “glossy paper-high-quality printing”.

As a printing medium, POD Gloss Coat paper (manufactured by Oji Paper Co., Ltd.) having a density of 100 g / m ² , the amount of pure water transferred was 3.1 ml / m ² with a contact duration of 100 ms, and the amount of transferred pure water 3.5 ml / m ² with a duration of contact of 400 MS.

Image density, foaming, protrusion blurring, wrinkling, glossiness, and image smudging resistance were evaluated by the following methods.

[Image Density]

, созданный при применении MICROSOFT WORD 2000 (производства компании Microsoft Corporation), печатали на среде для печати, и плотность изображения на участке моноцветного сплошного изображения измеряли посредством денситометра X-Rite 938 (производства компании X-Rite Co.). Для печати, режим печати изменяли от «глянцевая бумага-высококачественная печать» на «без коррекции цвета». Следует заметить, что плотность изображения для данного изображения определяли как «A», когда плотность изображения черного цвета была 2,0 или более, плотность изображения желтого цвета была 1,25 или более, и плотность изображения пурпурного цвета была 2,0 или более, и плотность изображения голубого цвета была 2,0 или более; определяли как «B», когда плотность изображения черного цвета была 1,7 или более, однако менее чем 2,0, плотность изображения желтого цвета была 1,1 или более, однако менее чем 1,25, плотность изображения пурпурного цвета была 1,7 или более, однако менее чем 2,0, и плотность изображения голубого цвета была 1,7 или более, однако менее чем 2,0; определяли как «C», когда плотность изображения черного цвета была 1,5 или более, однако менее чем 1,7, плотность изображения желтого цвета была 0,95 или более, однако менее чем 1,1, плотность изображения пурпурного цвета была 1,5 или более, однако менее чем 1,7, и плотность изображения голубого цвета была 1,5 или более, однако менее чем 1,7; и определяли как «D», когда плотность изображения черного цвета была менее чем 1,5, плотность изображения желтого цвета была менее чем 0,95, плотность изображения пурпурного цвета была менее чем 1,5, и плотность изображения голубого цвета была менее чем 1,5.Test object including a 64-dot monochromatic solid image

created using MICROSOFT WORD 2000 (manufactured by Microsoft Corporation) was printed on a printing medium, and the image density in the monochromatic continuous image area was measured using an X-Rite 938 densitometer (manufactured by X-Rite Co.). For printing, the print mode was changed from “glossy paper-high-quality printing” to “no color correction”. It should be noted that the image density for this image was defined as “A” when the black image density was 2.0 or more, the yellow image density was 1.25 or more, and the magenta image density was 2.0 or more, and the cyan image density was 2.0 or more; defined as “B” when the black image density was 1.7 or more, but less than 2.0, the yellow image density was 1.1 or more, but less than 1.25, the magenta image density was 1, 7 or more, but less than 2.0, and a blue image density of 1.7 or more, but less than 2.0; defined as “C” when the black image density was 1.5 or more, however less than 1.7, the yellow image density was 0.95 or more, however less than 1.1, the magenta image density was 1, 5 or more, but less than 1.7, and the image density of the blue color was 1.5 or more, but less than 1.7; and defined as “D” when the black image density was less than 1.5, the yellow image density was less than 0.95, the magenta image density was less than 1.5, and the cyan image density was less than 1 ,5.

[Foaming]

, созданный при применении MICROSOFT WORD 2000 (производства компании Microsoft Corporation), печатали на среде для печати, и неравномерность плотности на участке моноцветного сплошного изображения оценивали визуальным образом. Для печати, режим печати изменяли от «глянцевая бумага-высококачественная печать» на «без коррекции цвета». Следует заметить, что состояние, когда отсутствовала неравномерность плотности, определяли как «A», состояние, когда имела место небольшая неравномерность в плотности, определяли как «B», состояние, когда имела место неравномерность плотности, определяли как «C», и состояние, когда имела место значительная степень неравномерности плотности определяли как «D».Test object including a 64-dot monochromatic solid image

created using MICROSOFT WORD 2000 (manufactured by Microsoft Corporation) was printed on a printing medium, and density unevenness in a monochromatic continuous image portion was evaluated visually. For printing, the print mode was changed from “glossy paper-high-quality printing” to “no color correction”. It should be noted that the state when there was no density non-uniformity was defined as “A”, the state when there was a slight density non-uniformity was defined as “B”, the state when the density non-uniformity occurred was defined as “C”, and the state when there was a significant degree of uneven density was defined as "D".

[Lubrication as a protrusion]

, созданный при применении MICROSOFT WORD 2000 (производства компании Microsoft Corporation), печатали на среде для печати, и смазывание в виде смещения от участка сплошного изображения к фоновому участку в виде выступа оценивали визуальным образом. Для печати, режим печати изменяли от «глянцевая бумага-высококачественная печать» на «без коррекции цвета». Следует заметить, что случай, когда смазывание в виде смещения наблюдалось отчетливым образом, определяли как «III», случай, когда смазывание в виде смещения наблюдалось незначительным образом, определяли как «II», и случай, когда смазывание в виде смещения не наблюдалось вообще, определяли как «I».Test object including a 64-dot monochromatic solid image

created using MICROSOFT WORD 2000 (manufactured by Microsoft Corporation) was printed on a printing medium, and smearing as an offset from the portion of the continuous image to the background portion in the form of a protrusion was evaluated visually. For printing, the print mode was changed from “glossy paper-high-quality printing” to “no color correction”. It should be noted that the case where blurring in the form of an offset was observed distinctly was defined as “III”, the case when the lubrication in the form of an offset was observed slightly, was defined as “II”, and the case when the lubrication in the form of an offset was not observed at all, defined as "I".

[Puckering]

, имеющего размер 3 см × 15 см, созданного при применении MICROSOFT WORD 2000 (производства компании Microsoft Corporation), на среде для печати, возникновение сморщивания на участке моноцветного сплошного изображения оценивали визуальным образом. Для печати, режим печати изменяли от «глянцевая бумага-высококачественная печать» на «без коррекции цвета». Следует заметить, что случай, когда сморщивание не происходило, определяли как A», случай, когда сморщивание происходило в небольшой степени, определяли как «B», случай, когда сморщивание происходило, определяли как «C», и случай, когда сморщивание происходило в значительной степени, определяли как «D».Shortly after printing a test object including a monochromatic solid image

having a size of 3 cm × 15 cm, created using MICROSOFT WORD 2000 (manufactured by Microsoft Corporation) on a printing medium, the occurrence of wrinkling in a monochromatic continuous image area was evaluated visually. For printing, the print mode was changed from “glossy paper-high-quality printing” to “no color correction”. It should be noted that the case where wrinkling did not occur was defined as A, the case where wrinkling occurred to a small extent was defined as “B”, the case where wrinkling occurred was defined as “C”, and the case when wrinkling occurred in to a large extent, defined as "D".

[Glossiness]

, имеющее размер 3 см × 15 см, созданного при применении MICROSOFT WORD 2000 (производства компании Microsoft Corporation), на среде для печати, глянцевитость в отраженном свете при 60° участка моноцветного сплошного изображения и глянцевитость участка, не подвергнутого печати, измеряли посредством гляриметра 4501 (производства компании BYK Gardner), чтобы тем самым оценить глянцевитость. Для печати, режим печати изменяли от «глянцевая бумага-высококачественная печать» на «без коррекции цвета». Следует заметить, что случай, когда абсолютная величина разности между глянцевитостью в отраженном свете при 60° участка моноцветного сплошного изображения и глянцевитостью участка, не подвергнутого печати, составляла менее чем 5, определяли как «A», случай, когда ее абсолютная величина была 5 или более, однако менее чем 10, определяли как «B», и случай, когда ее абсолютная величина была 10 или более, однако менее чем 15, определяли как «C», и случай, когда ее абсолютная величина была 15 или более, определяли как «D».After printing a test object including a monochromatic solid image

having a size of 3 cm × 15 cm created using MICROSOFT WORD 2000 (manufactured by Microsoft Corporation) on a printing medium, glossiness in reflected light at 60 ° of a monochromatic solid image portion, and glossiness of an unprinted portion was measured using a 4501 glimeter (manufactured by BYK Gardner) to evaluate glossiness. For printing, the print mode was changed from “glossy paper-high-quality printing” to “no color correction”. It should be noted that the case when the absolute value of the difference between the glossiness in reflected light at 60 ° of the monochromatic continuous image portion and the glossiness of the unprinted portion was less than 5 was defined as “A”, the case when its absolute value was 5 or more, however, less than 10, was defined as “B”, and the case when its absolute value was 10 or more, however less than 15, was defined as “C”, and the case when its absolute value was 15 or more, was defined as "D".

[Resistance to image blurring]

, имеющее размер 3 см × 15 см, созданного при применении MICROSOFT WORD 2000 (производства компании Microsoft Corporation), на среде для печати, среду для печати с напечатанным изображением сушили в течение 24 часов в отрегулированной окружающей среде при 23°C±2°C и относительной влажности (RH) 50%±15%.After printing a test object including a monochromatic solid image

having a size of 3 cm × 15 cm created using MICROSOFT WORD 2000 (manufactured by Microsoft Corporation) on a print medium, a print medium with a printed image was dried for 24 hours in a regulated environment at 23 ° C ± 2 ° C and relative humidity (RH) 50% ± 15%.

Then cotton weave JIS L0803 Cotton No. 3, attached to the counter with CM-1 clock mechanism with double-sided tape, was moved 10 times forward and backward in a monochromatic continuous image, followed by measuring the density of the smear applied on the cotton fabric and the density of the base of the cotton fabric using X-Rite939 (manufactured by X-Rite Co.) to thereby evaluate the resistance to image smearing. For printing, the print mode was changed from “glossy paper-high-quality printing” to “no color correction”. It should be noted that the case where the difference between the density of the smear applied to the cotton fabric and the density of the base of the cotton fabric was less than 0.05 was evaluated as “A”, the case where the difference was 0.05 or more, but less than 0 , 1, was rated as “B,” and the case where the difference was 0.1 or more but less than 0.15 was rated as “C,” and the case where the difference was 0.15 or more was rated as “D ".

The results of the evaluation of image density, foaming, blurring in the form of a protrusion, wrinkling, glossiness and resistance to image smudging are presented in Table 2.

table 2 Image density Foaming Lubrication in the form of a ledge Puckering Glossiness Resistant to image stain Example 1 B A I A A A Example 2 B A I A A A Example 3 B A I A A A Example 4 B A I A B A Example 5 A B II B B A Example 6 B A I A A A Example 7 B A I A A A Example 8 C A I A A A Example 9 C A I A A A Example 10 C B I C B B Example 11 B A I A A A Example 12 B A I A A A Example 13 B A I B A A Example 14 B A I B A A Example 15 B A I B A A Example 16 B A I B A A Example 17 A A II C B B Example 18 A A I C A A Example 19 A A II C B B Example 20 A A II C A A Comparative Example 1 A B I B D C Reference Example 2 B B I B D D Reference Example 3 C D III D B B Reference Example 4 C C III C B B Reference Example 5 C C III C B B

It was found from the results presented in Table 2 that the inkjet ink of Examples 1 to 20 had excellent image density, glossiness and resistance to smearing of the image and could prevent the occurrence of foaming, smearing in the form of a protrusion and wrinkling.

On the other hand, the inkjet ink of Comparative Example 1 had low gloss in a monochromatic continuous image region when the mass ratio of water-dispersible resin to pigment was 0.5.

The inkjet ink of Comparative Example 2 had low gloss in a monochromatic continuous image region when the amount of pigment contained was 7.5% by weight and the water dispersible resin was not contained.

Inkjet inks of Comparative Examples 3 to 5 provided a low image density and caused foaming, protrusion smearing and wrinkling, since these inkjet inks did not contain a compound represented by general formula (1) and / or compounds represented by general formulas (2) by (4).

The inkjet inks of Comparative Example 6 had a low output stability, since the mass ratio of water-dispersible resin to pigment was 9.0, and therefore estimates of image density, foaming, protrusion, wrinkling, glossiness, and image smoothening resistance could not be performed.

The inkjet inks of Comparative Example 7 had a low output stability, since the total amount of pigment and water dispersible resin was 35.7% by weight, and therefore estimates of image density, foaming, protrusion, wrinkling, glossiness, and resistance to image smearing could not to be performed.

Embodiments of the present invention are as follows.

<1> Inkjet ink containing:

water-dispersible coloring matter;

surface-active substance;

wetting agent;

water dispersible resin;

a moisturizing agent containing at least polyhydric alcohol having an equilibrium humidity of 30% by weight or higher at 23 ° C and a relative humidity (RH) of 80%;

a compound represented by the following general formula (1);

water and

at least one compound from the group consisting of a compound represented by the following general formula (2), a compound represented by the following general formula (3), and a compound represented by the general formula (4) below,

where the water-dispersible colorant is at least one substance selected from the group consisting of a self-dispersible pigment, a pigment dispersed by a pigment dispersing agent, and resin particles, each of which contains a pigment,

where the total amount of water-dispersible coloring material and water-dispersible resin is from 8% by weight to 35% by weight, and

where the mass ratio of water-dispersible resin to water-dispersible coloring material is from 2 to 8:

Общая формула (1),

General formula (1),

where R ₁ represents a C4-C6 alkyl group,

Общая формула (2),

General formula (2),

where R ₂ represents a hydrogen atom, a methyl group or an ethyl group, and R ₃ represents a C1-C4 alkyl group,

Общая формула (3),

General formula (3),

where R ₄ represents a methyl group or ethyl group, and R ₅ represents a hydroxyl group, a C1-C8 alkyl group, a cycloalkyl group or an aryl group,

Общая формула (4),

General formula (4),

where each of R ₆ and R ₇ independently represents a C1-C8 alkyl group.

<2> Inkjet ink according to <1>, further comprising a compound represented by the following chemical formula:

CH ₃ OCH ₂ CH ₂ CON (CH ₃ ) ₂

<3> Inkjet ink according to any one of <1> or <2>, wherein the water dispersible resin is an acrylic silicone resin, a fluorine-containing resin or a combination of an acrylic-silicone resin and a fluorine-containing resin.

<4> Inkjet ink according to any one of <1> to <3>, where the self-dispersing pigment is anionic pigment.

<5> Inkjet ink according to any one of <1> to <4>, wherein the surfactant is a silicone surfactant, a fluorine-containing surfactant, an acetylene alcohol based surfactant, or any their combination.

<6> Inkjet ink according to any one of <1> to <5>, where the ink has a dynamic surface tension of 35 mN / m or less at 25 ° C with a surface lifetime of 15 ms when measured by determining the maximum pressure bubbles.

<7> An inkjet printing apparatus comprising:

an outlet assembly configured to produce inkjet ink,

where the inkjet ink is an inkjet ink according to any one of items <1> to <6>.

Claims (7)

1. Inkjet ink containing:
water-dispersible coloring matter;
surface-active substance;
wetting agent;
water dispersible resin;
a moisturizing agent containing at least polyhydric alcohol having an equilibrium humidity of 30% by weight or higher at 23 ° C and a relative humidity (RH) of 80%;
a compound represented by general formula (1);
water and
at least one compound from the group consisting of a compound represented by general formula (2), a compound represented by general formula (3), and a compound represented by general formula (4),
where the water-dispersible colorant is at least one substance selected from the group consisting of a self-dispersible pigment, a pigment dispersed by a pigment dispersing agent, and resin particles, each of which contains a pigment,
where the wetting agent is at least one selected from the group consisting of lower alcohols, C ₈ -C ₁₁ polyols and C ₈ -C ₁₁ polyol esters,
where the total amount of water-dispersible coloring material and water-dispersible resin is from 8% by weight to 35% by weight, and
where the mass ratio of water-dispersible resin to water-dispersible coloring material is from 2 to 8:

where R ₁ represents a C4-C6 alkyl group,

where R ₂ represents a hydrogen atom, a methyl group or an ethyl group, R ₃ represents a C1-C4 alkyl group,

where R ₄ represents a methyl group or ethyl group, R ₅ represents a hydroxyl group, a C1-C8 alkyl group, a cycloalkyl group or an aryl group,

wherein each of R ₆ and R ₇ independently represents a C1 -C8 alkyl group,
where the total number of compounds represented by the general formulas (1) to (4) is from 1 to 50% by weight. 2. Inkjet ink according to claim 1, additionally containing a compound represented by the chemical formula
CH ₃ OCH ₂ CH ₂ CON (CH _{3) 2.} 3. Ink for inkjet printing according to any one of paragraphs. 1 or 2, wherein the water-dispersible resin is an acrylic silicone resin, a fluorine-containing resin, or a combination of an acrylic-silicone resin and a fluorine-containing resin. 4. Ink for inkjet printing according to any one of paragraphs. 1 and 2, where the self-dispersing pigment is an anionic pigment. 5. Ink for inkjet printing according to any one of paragraphs. 1 and 2, wherein the surfactant is a silicone surfactant, a fluorine-containing surfactant, an acetylene alcohol based surfactant, or any combination thereof. 6. Ink for inkjet printing according to any one of paragraphs. 1 and 2, where the ink has a dynamic surface tension of 35 mN / m or less at 25 ° C with a surface lifetime of 15 ms when measured by determining the maximum bubble pressure. 7. Device for inkjet printing, containing:
an outlet assembly configured to produce inkjet ink,
where the ink for inkjet printing are ink for inkjet printing according to any one of paragraphs. 16.

Images