Abstract: An example of an inkjet composition includes a colorant, a density modifier selected from the group consisting of a triiodo amino derivative of isophthalic acid, a mixture of polysucrose and sodium diatrizoate, colloidal silica particles coated with polyvinylpyrrolidone, and combinations thereof; and an aqueous vehicle. The inkjet composition may be inkjet printed on a substrate, using a thermal or piezoelectric printer.

Abstract: An example of an inkjet ink composition includes a pigment, a dispersion synergist, a metal oxide, a polar solvent and water. The pigment is selected from the group consisting of a quinacridone and a phthalocyanine. The dispersion synergist has a structure of the pigment substituted with at least one solubilizing moiety selected from the group consisting of an ionic moiety, a non-ionic moiety, and a combination thereof.

Abstract: A black inkjet ink composition includes a carbon black pigment; a dispersion synergist having an aromatic structure substituted with at least one solubilizing moiety selected from the group consisting of an ionic moiety, a non-ionic moiety, and a combination thereof; a polar solvent; and water. A method for making the black inkjet ink composition and a printing method using the same is also disclosed.

Abstract: A non-Newtonian photo-curable ink composition that comprises from about 0.1 wt % to about 10 wt % of metal oxide particles having an average particle size ranging from 1 to 50 nm; from about 0.05 wt % to about 10 Wt % of an inorganic salt; an organic solvent; a photo-initiator; and a polymerizable material; wherein the ink composition has a first dynamic viscosity ranging from 25 cps to 10,000 cps at a first state and a second dynamic viscosity ranging from 1 cps to 50 cps at a second state. Also described herein is a method for making such non-Newtonian photo-curable ink composition and a method for producing printed images using such non-Newtonian photo-curable ink composition.

Abstract: An ink composition includes water, a co-solvent, a colorant, and a modified polymer or copolymer additive. The modified polymer or copolymer additive is selected from the group consisting of i) a hydrolyzed poly(isobutylene-alt-maleic anhydride), ii) a hydrolyzed poly(maleic anhydride-alt-1-octadecene), and iii) a modified polymer or copolymer. The modified polymer or copolymer includes a repeating unit of a backbone chain, and a long chain pendant group attached to a carbon atom of the repeating unit. In the backbone chain, the long chain pendant group of the repeating unit is separated by fewer than 8 spacer carbon atoms from another long chain pendant group of an adjacent repeating unit.

Abstract: An ink composition includes a colorant, a co-solvent, a surfactant system, and water. The surfactant system consists of an acid, lithium, and a non-ionic surfactant. The acid is selected from the group consisting of oleic acid, linoleic acid, undecanoic acid, dodecanoic acid, tridecanoic acid, and combinations thereof. The non-ionic surfactant includes a hydrophilic head group to interact with the lithium and a hydrophobic tail to not sterically hinder formation of an anti-evaporative layer to be formed by the surfactant system. The non-ionic surfactant also excludes any ethyleneoxy groups.

Abstract: A non-Newtonian photo-curable ink composition that includes a metal oxide/alkoxysilane complex in an amount ranging from about 0.1 wt % to about 10 wt %, a salt in an amount ranging from about 0.05 wt % to about 20 wt %, a photo-initiator, an organic solvent, and water, wherein the ink composition has a first dynamic viscosity ranging from 25 cps to 10,000 cps at a first state and a second dynamic viscosity ranging from 1 cps to 50 cps at a second state. Also described herein is a method for making such non-Newtonian photo-curable ink composition and a method for producing printed images using such non-Newtonian photo-curable ink composition.

Abstract: An ink composition includes colorant, co-solvent system, acid (e.g., oleic, linoleic, undecanoic, dodecanoic, and/or tridecanoic acids), lithium, polymer as binder, and water. The co-solvent system is selected from i) from ˜9 to ˜25 wt % of sulfolane with no other co-solvent, ii) hydroxylated co-solvent, from ˜4 to ˜16 wt % of sulfolane, and at least 8 wt % of another non-hy-droxylated co-solvent; iii) hydroxylated co-solvent, from ˜7 to ˜16 wt % of sulfolane, and at least 3 wt % of the other non-hydroxylated co-solvent; and iv) a hydroxylated co-solvent and from ˜9 wt % to ˜16 wt % of sulfolane. When i) or ii) or iv) is used, at least 0.15 wt % acid and at least 200 ppm lithium are included; or when iii) is used, at least 0.25 wt % acid and at least 100 ppm lithium are included; or when iii) is used, at least 0.15 wt % acid and at least 150 ppm lithium are included.

Abstract: A non-Newtonian photo-curable ink composition that includes a polymerizable FMOC material in an amount ranging from about 2 wt % to about 20 wt % by total weight of the ink composition, a photo-initiator, an organic solvent and water, wherein the ink composition has a first dynamic viscosity ranging from 25 cps to 10,000 cps at a first state and a second dynamic viscosity ranging from 1 cps to 50 cps at a second state. Also described herein is a method for making such non-Newtonian photo-curable ink composition and a method for producing printed images using such non-Newtonian photo-curable ink composition.

Abstract: A non-Newtonian photo-curable ink composition that comprises a combination of metal oxide particles in an amount ranging from about 0.1 wt % to about 20 wt % based on the total weight of the ink; an organic solvent; a photo-initiator; and a polymerizable material wherein the ink composition has a first dynamic viscosity ranging from 25 cps to 10,000 cps at a first state and a second dynamic viscosity ranging from 1 cps to 50 cps at a second state. Also described herein is a method for making such non-Newtonian photo-curable ink composition and a method for producing printed images using such non-Newtonian photo-curable ink composition.

Abstract: A non-Newtonian photo-curable ink composition that comprises a structured network forming agent in an amount ranging from about 0.1 wt % to about 20 wt % by total weight of the ink composition; a salt in an amount ranging from about 0.05 wt % to about 20 wt % by total weight of the ink composition; an organic solvent; a photo-initiator; and a polymerizable material; wherein the ink composition has a first dynamic viscosity ranging from 25 cps to 10,000 cps at a first state and a second dynamic viscosity ranging from 1 cps to 50 cps at a second state. Also described herein is a method for making such non-Newtonian photo-curable ink composition and a method for producing printed images using such non-Newtonian photo-curable ink composition.

Abstract: A print head module for delivering ink to a print head comprising a module venting system comprising a one-time vent built into the interior of the print head module in which, when an amount of ink comes in contact with the one-time vent, air is prevented from passing through the one-time vent. A system for delivering ink to a print head comprising a print head, a external reservoir of ink, and a print head module comprising a one-time vent built into the interior of the print head module and fluidly coupling the print head to the external reservoir of ink, in which, when an amount of ink comes in contact with the one-time vent within the print head module, air is prevented from passing through the one-time vent.

Abstract: The present disclosure provides non-Newtonian inkjet inks and related methods. In one example, a non-Newtonian inkjet ink can comprise silica, alumina, and organic solvent. The non-Newtonian inkjet ink can be an aqueous ink having a pH from 9 to 12 and a conductivity from 100 to 2000 ?S/cm.

Abstract: An ink composition includes water, a co-solvent, a colorant, and a modified polymer or copolymer additive. The modified polymer or copolymer additive is selected from the group consisting of i) a hydrolyzed poly(isobutylene-alt-maleic anhydride), ii) a hydrolyzed poly(maleic anhydride-alt-1-octadecene), and iii) a modified polymer or copolymer. The modified polymer or copolymer includes a repeating unit of a backbone chain, and a long chain pendant group attached to a carbon atom of the repeating unit. In the backbone chain, the long chain pendant group of the repeating unit is separated by fewer than 8 spacer carbon atoms from another long chain pendant group of an adjacent repeating unit.

Abstract: A non-Newtonian photo-curable ink composition that comprises from about 0.1 wt % to about 10 wt % of metal oxide particles having an average particle size ranging from 1 to 50 nm; from about 0.05 wt % to about 10 Wt % of an inorganic salt; an organic solvent; a photo-initiator; and a polymerizable material; wherein the ink composition has a first dynamic viscosity ranging from 25 cps to 10,000 cps at a first state and a second dynamic viscosity ranging from 1 cps to 50 cps at a second state. Also described herein is a method for making such non-Newtonian photo-curable ink composition and a method for producing printed images using such non-Newtonian photo-curable ink composition.

Abstract: A non-Newtonian photo-curable ink composition that comprises a structured network forming agent in an amount ranging from about 0.1 wt % to about 20 wt % by total weight of the ink composition; a salt in an amount ranging from about 0.05 wt % to about 20 wt % by total weight of the ink composition; an organic solvent; a photo-initiator; and a polymerizable material; wherein the ink composition has a first dynamic viscosity ranging from 25 cps to 10,000 cps at a first state and a second dynamic viscosity ranging from 1 cps to 50 cps at a second state. Also described herein is a method for making such non-Newtonian photo-curable ink composition and a method for producing printed images using such non-Newtonian photo-curable ink composition.

Abstract: A non-Newtonian photo-curable ink composition that includes a polymerizable FMOC material in an amount ranging from about 2 wt % to about 20 wt % by total weight of the ink composition, a photo-initiator, an organic solvent and water, wherein the ink composition hasa first dynamic viscosity ranging from 25 cps to 10,000 cps at a first state and a second dynamic viscosity ranging from 1 cps to 50 cps at a second state. Also described herein is a method for making such non-Newtonian photo-curable ink composition and a method for producing printed images using such non-Newtonian photo-curable ink composition.

Abstract: A non-Newtonian photo-curable ink composition that includes a metal oxide/alkoxysilane complex in an amount ranging from about 0.1 wt % to about 10 wt %, a salt in an amount ranging from about 0.05 wt % to about 20 wt %, a photo-initiator, an organic solvent, and water, wherein the ink composition has a first dynamic viscosity ranging from 25 cps to 10,000 cps at a first sate and a second dynamic viscosity ranging from 1 cps to 50 cps at a second state. Also described herein is a method for making such non-Newtonian photo-curable ink composition and a method for producing printed images using such non-Newtonian pho to-curable ink composition.

Abstract: A non-Newtonian photo-curable ink composition that comprises a combination of metal oxide particles in an amount ranging from about 0.1 wt % to about 20 wt % based on the total weight of the ink; an organic solvent; a photo-initiator; and a polymerizable material wherein the ink composition has a first dynamic viscosity ranging from 25 cps to 10,000 cps at a first state and a second dynamic viscosity ranging from 1 cps to 50 cps at a second state. Also described herein is a method for making such non-Newtonian photo-curable ink composition and a method for producing printed images using such non-Newtonian photo-curable ink composition.

Abstract: The present disclosure provides non-Newtonian inkjet inks and related methods. In one example, a non-Newtonian inkjet ink can comprise silica, alumina, and organic solvent. The non-Newtonian inkjet ink can be an aqueous ink having a pH from 9 to 12 and a conductivity from 100 to 2000 ?S/cm.