Abstract: An ink to be applied to a recording head having a common liquid chamber, pressure chambers developing pressure applied to the liquid, individual channels through which the liquid is introduced into the pressure chambers from the common liquid chamber, and a group of nozzles which communicate with the pressure chambers and eject the liquid, where first nozzles having short individual channels and second nozzles having long ones are alternately arranged at arrangement intervals of less than 30 ?m along one side or sides of the common liquid chamber, contains an aqueous medium, a surfactant and a coloring material. The aqueous medium consists of water and a water-soluble organic compound containing at least one alkanediol and has a surface tension of from 40 mN/m or more to less than 60 mN/m in an environment of temperature 25° C. and humidity 50%.

Abstract: An aqueous inkjet printing fluid composition for use in an inkjet printer including a silicon-based material which contacts the aqueous printing fluid composition, having in a concentration sufficient to inhibit corrosion of the silicon-based material when contacted by the aqueous printing fluid composition a soluble metal ligand complex of Formula (I): wherein M represents a divalent or a trivalent metal, R1 and R2 each independently represent alkyl, aryl, or heteroaryl substituents, R3 represents hydrogen, a halide, or an alkyl, aryl, or heteroaryl substituent, and the number of ligands n is 2 or 3. The useful lifetime of microelectromechanical fluidic devices based on silicon fabrication is extended.

Abstract: Disclosed is a phase change ink comprising (a) a crystalline oxazoline compound; and (b) an amorphous polyterpene resin.

Abstract: There is provided is an ink for inkjet recording, including: a pigment coated with a water-insoluble resin including a structural unit represented by the following formula (1) and a structural unit having an ionic group; a nitrogen-containing organic solvent; resin particles; and water, wherein a mass ratio [nitrogen-containing organic solvent/resin particles] is from 2.0 to 6.0: wherein, in formula (1), R1 represents a hydrogen atom, a methyl group, or a halogen atom; L1 represents *—COO—, —OCO—, *—CONR2—, *—O—, or a substituted or unsubstituted phenylene group, wherein “*—” represents a bond linking to the main chain; R2 represents a hydrogen atom, or an alkyl group having 1 to 10 carbon atoms; and L2 represents a single bond or a divalent linking group having 1 to 30 carbon atoms, and an image forming method.

Abstract: An aqueous inkjet printing fluid composition for use in an inkjet printer having a silicon-based material which contacts the aqueous printing fluid composition, including in a concentration sufficient to inhibit corrosion of the silicon-based material when contacted by the aqueous printing fluid composition a soluble metal ligand complex of Formula (I): wherein M represents a divalent or a trivalent metal; each of X and R may independently be chosen from the group consisting of halogen, cyano, carboalkoxy, alkyl, alkoxy, aryl, hetaryl, carboxy, hydroxy, sulfo and phospho substituents; n and m independently represent an integer from 0-3; and the number of ligands y is 2 or 3; with the proviso that n+m is an integer from 1 to 6, and at least one of X and R comprises a solubilizing group capable of imparting water solubility to the complex. The useful lifetime of microelectromechanical fluidic devices based on silicon fabrication is extended.

Abstract: An inkjet recording ink which includes: a carbon black; a dispersant, wherein the dispersant is a sodium naphthalenesulfonate-formalin condensate; resin emulsion; and water, in which the resin emulsion contains a resin which is at least one of a urethane resin and a styrene-acryl resin, and the ink satisfies the following relationship: 20?B?A?50, where A(nm) represents a particle diameter D90 of particles contained in dispersion containing the carbon black, the dispersant, and water, which is before added with the resin emulsion, and B(nm) represents a particle diameter D90 of particles contained in the ink.

Abstract: An object of the invention is to provide an ink set which enables to improve image density and scratch resistance of the images recorded using an ink containing a self-dispersion pigment and an ink containing a modified siloxane compound. An ink set to be used for ink jet recording including plural inks having a first ink and a second ink independently, wherein the first ink contains at least a pigment having functional groups on surface of pigment particles and a compound having adsorptivity to the pigment and the functional group density on the surface of the pigment particles is 1.5 ?mol/m2 or more and less than 2.6 ?mol/m2 and the second ink contains at least a pigment and a modified siloxane compound.

Abstract: An aqueous inkjet printing fluid composition for use in an inkjet printer including a silicon-based material which contacts the aqueous printing fluid composition, having in a concentration sufficient to inhibit corrosion of the silicon-based material when contacted by the aqueous printing fluid composition a soluble metal ligand complex having a divalent or a trivalent metal M and one or more organic ligands of Formula (I): wherein X may be chosen from the group consisting of H and carboalkoxy, alkyl, alkoxy, aryl, hetaryl, carboxy, sulfo and phospho substituents; and Y may be chosen from the group consisting of H and carboalkoxy, alkyl, alkoxy, aryl, hetaryl, carboxy, amino, hydroxyl, sulfo and phospho substituents. The useful lifetime of microelectromechanical fluidic devices based on silicon fabrication is extended.

Abstract: An aqueous inkjet printing fluid composition for use in an inkjet printer having a silicon-based material which contacts the aqueous printing fluid composition, including in a concentration sufficient to inhibit corrosion of the silicon-based material when contacted by the aqueous printing fluid composition a soluble metal ligand complex of Formula (I): wherein M represents a divalent or a trivalent metal, R1 represents a hydrogen, or an alkyl, alkenyl, or aryl substituent, X1 and X2 each independently represent either O or S, Q represents the atoms necessary to form a five, six or seven-membered heterocyclic or carbocyclic ring, and the number of ligands n is 2 or 3. The useful lifetime of microelectromechanical fluidic devices based on silicon fabrication is extended.

Abstract: The invention provides an ink composition including a polymerizable compound represented by following Formula (1), a polymerization initiator and water: XA)n??Formula (1) wherein, in Formula (1), X represents a divalent or trivalent nitrogen-containing linking group represented by any one of following Formulae (X1) to (X3), A represents a polymerizable functional group having an amide group, and n represents 2 or 3: wherein, in Formulae (X1) to (X3), Z represents an alkylene group having 2 or 3 carbon atoms, or a divalent linking group including an alkylene group having 2 or 3 carbon atoms and an oxygen atom; and R1 represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms.

Abstract: A printing method that uses ink jet recording with a water-based ink set to form an image on a non-ink-absorbing or low-ink-absorbing recording medium, the method includes a printing step including recording with a color ink and recording with a resin ink performed after the recording with the color ink; and a drying step performed during the printing step and/or after the printing step. In the printing method, the water-based ink set includes the color ink containing a water-insoluble coloring agent and the resin ink not containing a coloring agent. The color ink contains the water-insoluble coloring agent, a resin component, a water-soluble solvent, and a surfactant. The resin ink contains a water-soluble resin solvent, a wax, and thermoplastic resin particles as a resin component that are insoluble in water but compatible in the water-soluble resin solvent.

Abstract: An ink composition for ink-jet recording includes a pigment; resin particles having a glass transition temperature of 80° C. or higher; at least one water-soluble organic solvent; and water, and a total mass of solid content in the ink composition for ink-jet recording is 10% by mass or more relative to the ink composition for ink-jet recording, and the at least one water-soluble organic solvent includes at least one organic solvent having an SP value of 27.5 or lower, the amount of the at least one organic solvent having an SP value of 27.5 or lower being 70% by mass or more relative to a total amount of the at least one water-soluble organic solvent. An ink-jet recording method is also provided.

Abstract: An aqueous pigment dispersion including: (A) a pigment; (B) a dispersion polymer having a neutralization degree of from 50% to 90% and a solubility of from 0.2 g to 0.8 g per 5 ml of water (25° C.), and containing an acidic group and a hydrophobic structural unit (a) having an aromatic ring linked via a linking group to an atom included in a main chain, a content ratio of the aromatic ring being from 10% by mass to less than 20% by mass based on a total mass of the polymer; and (C) a water-based liquid medium.

Abstract: Apparatus and methods for controlling application of a substance to a substrate involve the use of a gating agent that blocks the substance from or attracts the substance to the substrate. The apparatus and methods may utilize ink jet technology to apply the gating agent directly to the substrate or to an intermediate surface. The gating agent composition includes a nonionic surfactant, and water. The gating agent composition does not contain a discernable amount of dye, pigment or other colorant agent.

Abstract: The present invention is drawn toward an ink-jet ink, comprising an aqueous liquid vehicle having acid-functionalized polymer colloid particulates and polymer-attached pigment colorants dispersed in the liquid vehicle. The liquid vehicle can include at least one volatile co-solvent, each volatile co-solvent present having a boiling point at or below about 285° C. The total amount of volatile co-solvent present in the ink-jet ink can be from 5 wt % to 50 wt %. These ink-jet inks can be printed on traditional as well as non-porous substrates. Optionally, heat can be applied to an image printed with the ink-jet ink to drive off at least a portion of the volatile co-solvent(s).

Abstract: The present invention provides an oil-based ink composition for ink-jet recording comprising at least a coloring material, an organic solvent and a non-aqueous resin emulsion.

Abstract: Apparatus and methods for controlling application of a substance to a substrate involve the use of a nanoparticle-based gating agent that blocks the substance from or attracts the substance to the substrate. The apparatus and methods may utilize ink jet technology to apply the gating agent directly to the substrate or to an intermediate surface.

Abstract: An inkjet printing fluid composition including water and a water dispersible polyurethane additive of the general formula of (I) wherein Z is the central portion of a monomer unit that is the polymerization product of a diisocyanate; X1—Y1—X1 represents one or more soft segments wherein Y1 represents the central portion of a unit that is the polymerization product of a diamine or diol prepolymer having a molecular weight of greater than 300 Daltons; W is the central portion of one or more units containing an acid group; X2—Y2—X2 represents one or more hard segments wherein Y2 represents the central portion of a unit that is the polymerization product of a C2-C8 diol or diamine having a molecular weight of less than 250 Daltons; and X1, V and X2 can be the same or different and are an —O— or —N— atom; and further wherein the polyurethane additive has a weight average molecular weight of at least 6,000 Daltons and a sufficient number of acid groups to provide an acid number greater than 35, and the one or m

Abstract: An ink jet recording method for recording an image having metallic gloss on a textile product using an ink jet recording apparatus includes forming a base layer by letting droplets of a first ink composition containing a first thermoplastic resin adhere on the textile product; and forming a metallic gloss layer by letting droplets of a second ink composition containing a metallic pigment and a second thermoplastic resin adhere on the base layer. The glass transition temperature of the first thermoplastic resin is not higher than that of the second thermoplastic resin. The formation of the base layer is performed at a temperature not lower than the glass transition temperature of the first thermoplastic resin.

Abstract: The present invention provides an inkjet ink composition including: self-dispersing polymer particles, each of the self-dispersing polymer particles including a structural unit derived from a hydrophilic monomer and a structural unit derived from a hydrophobic monomer; colloidal silica; and colorant particles, the inkjet ink composition having excellent dischargeability and suppressing the deterioration of the liquid repellency of an inkjet head member.

Abstract: A multi-phase system for creating a metallic effect on a substrate, includes applying to the substrate a first ink jet ink having a dispersion of reflective metallic particles in a suitable carrier system, to form a reflective coating layer; and applying a second ink jet ink over the reflective coating layer to form a protective coating layer. Optionally, an undercoat layer is printed on the substrate prior to applying the first ink jet ink. The second ink jet includes at least one crosslinkable polymer or is otherwise energy curable. The second ink jet ink optionally imparts a color to the metallic image.

Abstract: An ink forming method involves preparing a deagglomerated ink or a modified deagglomerated ink. The deagglomerated ink or the modified deagglomerated ink includes at least deagglomerated colorant particles and a liquid component. The deagglomerated colorant particles are chosen from pigment particles each encapsulated with a dispersant. The colorant particles have a particle size ranging from about 50 nm to about 500 nm. Prior to shipping and/or storing the deagglomerated ink or the modified deagglomerated ink, a portion of the liquid component is removed to form a concentrated ink that has a nonvolatile solids content ranging from about 40 wt % to about 90 wt % of the concentrated ink.

Abstract: A method of dynamically controlling a perceived ink color printed on a substrate can include mixing selected amounts of each of a polystyrene nano-sphere dopant component and a nano-particle dopant component with a clear fluid carrier component, the mixed components configured in real time to define an ink structure having a predetermined wavelength. The method can further include imaging the substrate by ejecting the mixed components onto the substrate, the perceived color of the imaged substrate corresponding to a reflected wavelength of the ink structure. In embodiments, each of the carrier and dopant components can be in a powder form suitable for fuser type imaging devices.

Abstract: Provided is an ink jet clear ink containing a polymer fine particle. The polymer fine particle has a core-shell structure obtained by polymerizing an ?,?-ethylenically unsaturated hydrophobic monomer (b) as a core polymer in the presence of a shell polymer that is a copolymer having at least a unit derived from an ?,?-ethylenically unsaturated hydrophobic monomer (a) and a unit derived from a monomer selected from an ?,?-ethylenically unsaturated acid monomer and a salt thereof. The ?,?-ethylenically unsaturated hydrophobic monomer (b) includes at least a monomer containing a chain structure saturated alkyl group.

Abstract: A high viscosity aqueous inkjet ink that is useful in ink jet printers. The ink comprises heat activated colorant solids that are not heat activated during the printing process, and are printed onto a substrate in the form of an image that can be transferred onto a subsequent or final substrate by applying heat and intimate contact between the two substrates. The ink can also be heat activated onto the substrate without further transfer by applying heat at the temperature that is suitable for the activation of the colorant.

Abstract: The invention provides a radiation-curable ink composition for inkjet recording, the ink composition containing at least: a specific azo compound, a tautomer of the azo compound, a salt of the azo compound, a salt of the tautomer, a hydrate of the azo compound, a hydrate of the tautomer, or any combination thereof; a polymer dispersant; a cationic polymerizable compound; and a cationic polymerization initiator. The invention further provides an inkjet recording method including ejecting and curing the ink composition. The invention further provides a printed matter formed by the inkjet recording method.

Abstract: The invention provides a radiation-curable ink composition for inkjet recording, the ink composition containing at least: a specific azo compound, a tautomer of the azo compound, a salt of the azo compound, a salt of the tautomer, a hydrate of the azo compound, a hydrate of the tautomer, or any combination thereof; a polymer dispersant; a radical polymerizable compound; and a radical polymerization initiator. The invention further provides an inkjet recording method including ejecting and curing the ink composition. The invention further provides a printed matter formed by the inkjet recording method.

Abstract: A water-based ink set for ink-jet recording, includes two or more water-based inks each of which contains a colorant, water, and a water-soluble organic solvent; wherein at least one ink among the two or more water-based inks contains a dye represented by a general formula (1), and at least one ink among the two or more water-based inks contains a cationic polymer:

Abstract: The ink set for inkjet recording includes: a water-based ink containing pigment particles and 10 to 25 wt % of water-soluble high-boiling-point organic solvent having an SP value of not higher than 30; and a treatment liquid containing a fluidity reducing agent which reduces fluidity of the pigment particles by making contact with the water-based ink, and 10 to 25 wt % of water-soluble high-boiling-point organic solvent having an SP value of not higher than 30.

Abstract: A printing system has a print mechanism to dispense a curable ink onto print media, a texture roller having a textured surface arranged to transfer a texture through a film to the curable ink on the media resulting in textured ink, and a curing mechanism to cure the textured ink. A printing system has a print head to dispense a curable ink onto print media, a film arranged adjacent a side of the media upon which the ink is dispensed, a texture roller arranged on a side of the film opposite the media to transfer texture to the curable ink, resulting in textured ink, and a curing mechanism to cure the textured ink. A method of controlling gloss in a printed image includes forming a printed image on print media using curable ink, using a roller to transfer a texture pattern to the curable ink, and curing the ink such that the pattern cures into the ink.

Abstract: The invention provides an ink jet recording ink containing a self-dispersion pigment to a surface of which an anionic functional group represented by the following general formula (1) is bonded directly or through another atomic group, an ammonium salt of an organic carboxylic acid, water, and a water-soluble compound having a hydrophilicity-hydrophobicity coefficient of 0.26 or more as defined by the following equation (A), the ink having a surface tension of 34 mN/m or less, wherein M1 and M2 are, independently of each other, a hydrogen atom, alkali metal, ammonium or organic ammonium; Hydrophilicity-hydrophobicity coefficient=[(Water activity of a 20% aqueous solution)?(Molar fraction of water in the 20% aqueous solution)]/[1?(Molar fraction of water in the 20% aqueous solution)]??(A).

Abstract: An inkjet recording method includes: a treatment liquid application process in which a treatment liquid containing an acidic compound is coated on a recording medium by roller coating at a coating speed of 300 mm/sec or higher; and an ink application process in which an ink composition containing self-dispersing polymer particles having an acid value of from 30 mgKOH/g to 80 mgKOH/g, a pigment, and an aqueous medium is ejected, by an inkjet process, onto the recording medium coated with the treatment liquid to record an image.

Abstract: A white ink for an inkjet, comprising a silica, a resin emulsion, and water, wherein an amount of the resin emulsion, reported as a mass ratio relative to a value of 1 for the silica, is within a range from 0.10 to 0.45.

Abstract: An inkjet image forming method includes: applying, onto a recording medium which is held by suction on a support base, an ink composition including a pigment and a polymerizable compound using an inkjet; applying, onto the recording medium, a treatment liquid that includes an aggregating agent that is capable of aggregating components in the ink composition and that has a viscosity of 2 mPa·s to 5 mPa·s at 20° C. and a surface tension of 25 mN/m to 45 mN/m at 25° C.; and irradiating the ink composition applied to the recording medium with an active energy ray, thereby performing polymerization.

Abstract: A process for printing an image includes printing a substrate with an aqueous inkjet ink and drying the printed image with a near-infrared drying system, wherein the inkjet ink is a yellow or magenta inkjet ink and comprises a yellow or magenta colorant and a distinct near-infrared absorbing compound. Inkjet ink sets for use with an inkjet printing system employing a near-infrared drying system in the process include at least a black ink and a yellow ink, wherein the yellow ink comprises a yellow colorant and dispersed nanoparticulate colloidal silica at a concentration of from 0.1 to about 10 wt %, and the black ink comprises a black colorant and dispersed nanoparticulate colloidal silica at a concentration of from 0 wt. % to at most ½ of the wt. % of the dispersed nanoparticulate colloidal silica in the yellow ink.

Abstract: A continuous ink jet printer aqueous ink composition including pigment particles dispersed with a dispersant or self dispersing pigment particles without the need for a dispersant, and a polymer additive distinct from any dispersant used to disperse the pigment particles, wherein the polymer additive comprises a styrene-acrylic copolymer that does not substantially displace any dispersant used to disperse the pigment, present in an amount effective to stabilize the ink composition against shear induced agglomeration caused by pumping the ink composition through a continuous ink jet printing fluid system.

Abstract: Reactive inks and methods of generating an image on a substrate using both reactive and heat activated inks are presented. An image is printed on a substrate, without reacting the reagents in the ink. Subsequently, the reagents are reacted to fix the image to a substrate, with substantial permanency and fastness. Sublimation or similar heat activated dyes are printed are also printed on the substrate. The sublimation or similar heat activated dyes are activated, and have an affinity for polymer that is applied to the substrate.

Abstract: A foamed liquid coating apparatus prevents curling or warping of a sheet caused by coating irregularities when coated with a preprocessing solution using a coating roller or a liquid discharge head. The foamed liquid coating apparatus includes a container holding a liquid that can be foamed. A first foamed liquid producing/transporting unit produces a foamed liquid having a foam size greater than a required foam size from the liquid supplied from the container. A second foamed liquid producing/transporting unit produces a foamed liquid having the required foam size from the foamed liquid produced by the first foamed liquid producing/transporting unit. The foamed liquid produced by the second foamed liquid producing/transporting unit is applied onto a first coating roller. The foamed liquid is further supplied from the first coating roller to a second coating roller that coats a sheet with the foamed liquid.

Abstract: Provided is a set of a reaction liquid that has a buffering action against pH change and exhibits a pH of 3.5 or more and 5.5 or less, and an ink that has a higher pH than the reaction liquid. The ink comprises a pigment to a surface of a pigment particle of which a basic group that forms a cation form at the pH of the reaction liquid is bonded. The pigment does not have an acidic group having a pKa equal to or less than the pH of the reaction liquid. The pigment is dispersed by a water-soluble polymer that has an acidic group having a pKa equal to or more than the pH of the reaction liquid and equal to or less than the pH of the ink.

Abstract: Provided are an aqueous ink-jet ink and a method for forming an ink-jet image enabling to decrease bleed occurrence during high-speed printing and to realize highly detailed image quality. An aqueous ink-jet ink characterized by containing water, a pigment, an organic or inorganic amine salt, and a water-soluble resin having a higher pKa than an acid component formed by dissociation of the amine salt in an ink.

Abstract: The present invention provides a maintenance liquid for inkjet recording including at least water, an organic solvent, a basic compound and an acidic compound, and having pH of from 6.0 to 8.5.

Abstract: The present invention provides an ink set including: an ink composition including a pigment, polymer particles having an ethylene oxide chain in a side chain of the polymer, and a water-soluble polymerizable compound that has an ethylene oxide chain and that is polymerized by active energy rays; and a treating liquid including an aggregating agent that aggregates ingredients in the ink composition.

Abstract: An inkjet recording ink having a surface tension of 34 mN/m or more is provided. The inkjet recording ink contains an anionic self-dispersion pigment having an anionic functional group, a salt, and a water-soluble compound having a hydrophilicity/hydrophobicity coefficient of 0.26 or more. The ink contains a larger amount of cesium ion than the amount of the anionic functional group. The hydrophilicity/hydrophobicity coefficient is defined by equation (A).

Abstract: The invention is to provide a metal ink composition for ink-jet and more particularly, a metal ink composition which causes no formation of cracks on a PCB substrate, allows a low curing temperature, and provides improved adhesive strength even after coating.

Abstract: A liquid material arrangement method includes a first patter generating step, a dot deleting step and a liquid material arranging step. In the first pattern generating step, a first dot pattern is generated in which a first prescribed number of dots is set. In the dot deleting step, a second prescribed number of dots is deleted to generate a second dot pattern. In the liquid material arranging step, a liquid material is arranged in the prescribed region on the substrate by causing a nozzle and the substrate to scan in relative manner and discharging the liquid material based on the second dot pattern. In the dot deleting step, a dot indicator for each the first prescribed number of dots is determined based on discharge information of the nozzle, and the second prescribed number of dots is deleted based on the dot indicator.

Abstract: Provided are an ink jet ink set, an ink jet recording method, and an ink jet recording apparatus each of which can reduce the graininess of an image to be recorded and improve the water fastness of the image even in a recording medium such as plain paper. The ink jet ink set has a first ink and a second ink independently, and is used so that the first and second inks overlap each other at least partly upon application of the inks to a recording medium. The first ink contains at least a pigment and a silicone oil. The second ink contains at least a pigment and a graft polymer that includes at least a nonionic unit represented by the general formula (I) and a unit having a polysiloxane structure.

Abstract: A method of continuous inkjet printing comprising: A) providing a main fluid supply of a continuous inkjet printer with a printing fluid comprising water, a soluble or dispersed polymeric component, and less than a total of 10 wt % of low-volatile water soluble humectant having a boiling point of greater than 170 C; B) delivering the printing fluid from the main fluid supply to a printhead and ejecting a continuous stream of the printing fluid from the printhead which continuous stream is broken into spaced droplets; C) in response to electrical signals received from a control mechanism, controlling the spaced droplets to select between printing droplets for marking a substrate and nonprinting droplets that are collected and returned to the main fluid supply; D) stopping delivery of the printing fluid to the printhead upon completion of a printing procedure; E) providing a maintenance fluid supply with a maintenance fluid comprising water and at least 5 wt % low-volatile water soluble humectant having a boili

Abstract: A method of ejecting ink from a thermal inkjet printhead. The method includes the steps of: (i) supplying an ink to at least one nozzle chamber of the printhead; and (ii) actuating a heater element in the nozzle chamber and heating the ink to a temperature sufficient to form a bubble therein, thereby causing the ink to be ejected from a nozzle opening associated with the nozzle chamber. The ink is a solvent-based ink composition including: (a) 20-80 wt. % of a compound of formula (A); wherein: R1 is C1-6 alkyl; and each of R2, R3 and R4 is independently selected from H, C1-6 alkyl, halogen, OH, and C1-6 alkoxy; (b) 10-70 wt. % of a C1-6 alcohol; and (c) 0.01-25 wt. % of a colorant.

Abstract: The invention provides an ink composition containing at least: a water-soluble organic solvent; a pigment; water; and a nonionic polymer thickener. The content of the water-soluble organic solvent is from 5 weight % to 30 weight % relative to the total amount of the ink composition. The ratio of Vhigh/Vlow, in which Vhigh represents 25° C. viscosity (mPa·s) measured at a shear rate of 1.5×105 (s?1) and Vlow represents 25° C. viscosity (mPa·s) measured at a shear rate of 3.0×103 (s?1), is from 0.70 to 0.95. The invention further provides an image formation method including at least ejecting the ink composition onto an image recording medium using an image formation apparatus to form an image on the image recording medium.

Abstract: The present disclosure is drawn to an ink-jet ink and a method of ink-jet printing over a prolonged period of time. The ink-jet ink include from 0.1 wt % to 10 wt % pigment by solids, from 0.1 wt % to 15 wt % latex by solids, and from 0.01 wt % to 3 wt % phosphate-containing surfactant, wherein when the ink-jet ink is fired from a thermal ink-jet printhead at 400 million drops per nozzle with said nozzle having an orifice size of about 20 microns, at least 80% drop weight is retained compared to an initial firing prior to firing the 400 million drops per nozzle.