Abstract: An ink composition can include carbon black pigment, from 50 wt % to 80 wt % water, from 15 wt % to 35 wt % organic solvent, from 0.25 wt % to 9 wt % free latex particles having an average particles size from 50 nm to 500 nm, from 0.1 wt % to 1 wt % C10 to C20 fatty acid, and lithium.

Abstract: The present disclosure is drawn to an inkjet printing system including an ink composition and a microfluidic ejection assembly. The ink composition can include carbon black pigment, from 50 wt % to 80 wt % water, from 10 wt % to 40 wt % of an organic solvent system, and from 0.5 wt % to 6 wt % polyurethane. The microfluidic ejection assembly can include a drop generator for externally ejecting the ink composition, and a fluid pump for internally inducing microfluidic recirculation flow of the ink composition into the drop generator.

Abstract: The present disclosure is drawn to an inkjet printing system including an ink composition and a microfluidic ejection assembly. The ink composition can include carbon black pigment, from 50 wt % to 80 wt % water, from 10 wt % to 40 wt % of an organic solvent system, and from 0.5 wt % to 6 wt % polyurethane. The microfluidic ejection assembly can include a drop generator for externally ejecting the ink composition, and a fluid pump for internally inducing microfluidic recirculation flow of the ink composition into the drop generator.

Abstract: An ink composition can include carbon black pigment, from 50 wt % to 80 wt % water, from 15 wt % to 35 wt % organic solvent, from 0.25 wt % to 9 wt % free latex particles having an average particles size from 50 nm to 500 nm, from 0.1 wt % to 1 wt % C10 to C20 fatty acid, and lithium.

Abstract: An example inkjet ink composition includes a colorant, an organic solvent package, at least 50 wt % water with respect to the weight of the inkjet ink composition, and from about 0.25 wt % to about 2 wt %, with respect to the weight of the inkjet ink composition, of a polyurethane binder. The organic solvent package includes from about 1 wt % to about 12 wt %, with respect to the weight of the inkjet ink composition, of a first solvent having 1 or 2 free hydroxyl groups and 0 to 3 glycol units and from about 0.5 wt % to about 25 wt %, with respect to the weight of the inkjet ink composition, of a second solvent selected from the group consisting of 1-(2-hydroxyethyl)-2-pyrrolidinone, 2-pyrrolidone, glycerol, and combinations thereof.

Abstract: An example inkjet ink composition includes a colorant, an acid, lithium, an organic solvent package, at least 50 wt % water with respect to the weight of the inkjet ink composition, and from about 0.25 wt % to about 2 wt %, with respect to the weight of the inkjet ink composition, of a polyurethane binder. The acid is selected from the group consisting of oleic acid, linoleic acid, undecanoic acid, dodecanoic acid, tridecanoic acid, and combinations thereof. The organic solvent package includes from about 1 wt % to about 12 wt %, with respect to the weight of the inkjet ink composition, of a first solvent having 1 or 2 free hydroxyl groups and 0 to 3 glycol units and from about 0.5 wt % to about 25 wt %, with respect to the weight of the inkjet ink composition, of a second solvent selected from the group consisting of 1-(2-hydroxyethyl)-2-pyrrolidinone, 2-pyrrolidone, glycerol, and combinations thereof.

Abstract: The present disclosure is drawn to an inkjet ink composition. The inkjet ink composition can include carbon black pigment, polyurethane, at least 50 wt % water, and from 1 wt % to 12 wt % of a solvent having 1 or 2 free hydroxyl groups and 0 to 3 glycol units.

Abstract: An ink composition is described herein. In one example, an ink includes at least one pigment, at least one dispersant, and at least one durable polymer in a water-based dispersion medium including at least one hydrophilic solvent. The dispersant is present at from about 0.05 wt % to about 15 wt % of the ink composition. Further, the ink composition includes at least one dispersion additive.

Abstract: The present disclosure is drawn to non-aqueous ink compositions. The non-aqueous ink compositions can include from 55 wt % to 95 wt % of a mono-alcohol solvent, from 3 wt % to 15 wt % of a polymeric binder, and from 2 wt % to 7 wt % carbon black pigment. The mono-alcohol solvent can include ethanol and C3-C6 mono-alcohol having an ethanol to C3-C6 mono-alcohol weight ratio of 1:1 to 10:1. The polymeric can have a weight average molecular weight ranging from 1,500 Mw to 15,000 Mw. The carbon black pigment can be dispersed by a polymeric dispersing agent associated with a surface of the carbon black pigment.

Abstract: The present disclosure provides a white ink including an aqueous ink vehicle; from 5 wt % to 50 wt % of a white metal oxide pigment having an average particulate size from 75 nm to 2,000 nm and a refractive index of 1.8 to 2.8; and from 0.1 wt % to 15 wt % of fumed oxide particulates having a tertiary agglomerated average particulate size from 20 nm to 750 nm and a refractive index of 1.1 to 1.6. The white ink further includes a polymeric dispersant associated with a surface of the white metal oxide pigment.

Abstract: The present disclosure provides an example where a non-Newtonian white ink can include an aqueous ink vehicle, from 5 wt % to 60 wt % of white colorant, and from 0.1 wt % to 5 wt % of amphoteric alumina particles dispersed in the aqueous ink vehicle. The white colorant can include white metal oxide pigment having an average particulate size from 100 nm to 2,000 nm, an alumina coating on the white metal oxide pigment forming an alumina-coated pigment, and a polymeric dispersant associated with a surface of the alumina-coated pigment. The amphoteric alumina particles can have an average particles size from 2 nm to less than 100 nm.

Abstract: The present disclosure is drawn to an ink composition. The ink composition can include carbon black pigment, polyurethane, at least 50 wt % water, and from 1 wt % to 6 wt % of diol solvent, triol solvent, or a mixture thereof. When the solvent is a diol solvent the ink composition can be devoid of 2-pyrrolidone.

Abstract: The present disclosure is drawn to a fluid set for inkjet imaging which includes a white inkjet ink and a fixer fluid. The white ink can include an aqueous ink vehicle, from 5 wt % to 50 wt % of a white metal oxide pigment having an average particulate size from 100 nm to 2,000 nm, and from 0.1 wt % to 4 wt % of anionic oxide particulates having an average particulate size from 1 nm to 100 nm. The white ink can also include a non-ionic or predominantly non-ionic dispersant having an acid number not higher than 100 mg KOH/g based on dry polymer weight. The fixer fluid can include an aqueous fixer vehicle and from 0.1 wt % to 25 wt % cationic polymer.

Abstract: The present disclosure provides a white ink including an aqueous ink vehicle, from 5 wt % to 50 wt % of a white metal oxide pigment having an average particulate size from 100 nm to 2,000 nm, from 0.1 wt % to 4 wt % of anionic oxide particulates having an average particulate size from 1 nm to 100 nm, from 2 wt % to 30 wt % of latex particulates having a glass transition temperature from 0 C. to 130 C., and a non-ionic or predominantly non-ionic dispersant having an acid number not higher than 100 mg KOH/g based on dry polymer weight. The white metal oxide pigment and anionic oxide particulates are present in the white ink at a weight ratio from 5:1 to 200:1.

Abstract: The present disclosure is drawn to fluid sets for inkjet imaging and can comprise a white ink and a fixer fluid. The white ink can include an aqueous ink vehicle, from 5 wt % to 50 wt % of a white metal oxide pigment, and from 0.02 wt % to 2 wt % of an anionic low molecular weight polymer. The white metal oxide pigment can have an average particulate size from 100 nm to 2,000 nm, and can be dispersed by a non-ionic or predominantly non-ionic dispersant having an acid number not higher than 100 mg KOH/g based on dry polymer weight. The anionic low molecular weight polymer can have a weight average molecular weight of 3,000 Mw to 50,000 Mw and an acid number higher than 100 mg KOH/g based on dry polymer weight. The fixer fluid can include an aqueous fixer vehicle and from 0.1 wt % to 25 wt % cationic polymer.

Abstract: The present disclosure provides white pigment dispersions, which can include an aqueous liquid vehicle, and from 5 wt % to 70 wt % of a white metal oxide pigment dispersed by two co-dispersants. The metal oxide pigment can have an average particulate size from 100 nm to 1 ?m, and the co-dispersants can include both i) a short-chain anionic dispersant having a weight average molecular weight ranging from 1,000 Mw to 30,000 Mw, and ii) a non-ionic or predominantly non-ionic dispersant.

Abstract: The present disclosure provides a white ink including an aqueous ink vehicle, from 5 wt % to 50 wt % of a white metal oxide pigment having an average particulate size from 100 nm to 2,000 nm, from 0.02 wt % to 2 wt % of an anionic low molecular weight polymer having a weight average molecular weight of 3,000 Mw to 50,000 Mw and an acid number higher than 100 mg KOH/g based on dry polymer weight, and from 2 wt % to 30 wt % of latex particulates having a glass transition temperature from 0 C to 130 C. Furthermore, the white metal oxide pigment is dispersed by a non-ionic or predominantly non-ionic dispersant having an acid number not higher than 100 mg KOH/g based on dry polymer weight.

Abstract: An aqueous radiation curable dispersant formulation includes water and styrene acrylic resin stabilized thioxanthone derivative photoinitiator particles dispersed in the water. The styrene acrylic resin stabilized thioxanthone derivative photo initiator particles have a volume-weighted mean diameter of less than 40 nm. The styrene acrylic resin stabilized thioxanthone derivative photo initiator particles include a water-insoluble, thioxanthone derivative photoinitiator core having one, two, or three units. When the water-insoluble, thioxanthone derivative photoinitiator core includes two units or three units, the units are covalently bonded together.

Abstract: The present disclosure provides an example where a non-Newtonian white ink can include an aqueous ink vehicle, from 5 wt % to 60 wt % of white colorant, and from 0.1 wt % to 5 wt % of amphoteric alumina particles dispersed in the aqueous ink vehicle. The white colorant can include white metal oxide pigment having an average particulate size from 100 nm to 2,000 nm, an alumina coating on the white metal oxide pigment forming an alumina-coated pigment, and a polymeric dispersant associated with a surface of the alumina-coated pigment. The amphoteric alumina particles can have an average particles size from 2 nm to less than 100 nm.

Abstract: The present disclosure is drawn to fluid sets for inkjet imaging and can comprise a white ink and a fixer fluid. The white ink can include an aqueous ink vehicle, from 5 wt % to 50 wt % of a white metal oxide pigment, and from 0.02 wt % to 2 wt % of an anionic low molecular weight polymer. The white metal oxide pigment can have an average particulate size from 100 nm to 2,000 nm, and can be dispersed by a non-ionic or predominantly non-ionic dispersant having an acid number not higher than 100 mg KOH/g based on dry polymer weight. The anionic low molecular weight polymer can have a weight average molecular weight of 3,000 Mw to 50,000 Mw and an acid number higher than 100 mg KOH/g based on dry polymer weight. The fixer fluid can include an aqueous fixer vehicle and from 0.1 wt % to 25 wt % cationic polymer.