Aqueous inkjet ink compositions are provided. In an embodiment, such an aqueous inkjet ink composition comprises water; a high viscosity latex; a colorant; and optionally, a wax. The high viscosity latex comprises water and resin particles comprising a polymerization product of a monomer, an acidic monomer, a hydrophilic monomer, a difunctional monomer, and a reactive surfactant. The high viscosity latex is characterized by a viscosity in a range of from 10 cP to 100 cP as measured at a solid content of 30% and at room temperature. The aqueous inkjet ink composition is free of a water-soluble binder. Methods of forming and using the aqueous inkjet ink compositions are also provided.

Aqueous inkjet ink compositions are provided. In an embodiment, such a composition comprises water; a monodisperse latex; and a colorant; wherein the monodisperse latex comprises resin particles comprising a polymerization product of a monomer, an acidic monomer, a multifunctional monomer, and a reactive surfactant, the resin particles having a D.sub.(z, ave) of no greater than 150 nm, a D.sub.(z, 90) of less than 200 nm, and a polydispersity index (PDI) of no greater than 0.050. Methods of forming and using the aqueous inkjet ink compositions are also provided.

Aqueous inkjet ink compositions are provided. In an embodiment, such a composition comprises water; a monodisperse latex; and a colorant; wherein the monodisperse latex comprises resin particles comprising a polymerization product of a monomer, an acidic monomer, a multifunctional monomer, and a reactive surfactant, the resin particles having a D.sub.(z, ave) of no greater than 150 nm, a D.sub.(z, 90) of less than 200 nm, and a polydispersity index (PDI) of no greater than 0.050. Methods of forming and using the aqueous inkjet ink compositions are also provided.

A liquid composition contains an inorganic oxide and an organic solvent represented by the following Chemical Formula 1,

##STR00001## where R.sub.1 and R.sub.2 each, independently represent straight chain alkyl groups or straight chain alkoxy groups, wherein the organic solvent has a topological index chai4v of 0.9 or greater.

A liquid composition contains an inorganic oxide and an organic solvent represented by the following Chemical Formula 1,

##STR00001## where R.sub.1 and R.sub.2 each, independently represent straight chain alkyl groups or straight chain alkoxy groups, wherein the organic solvent has a topological index chai4v of 0.9 or greater.

A water-based ink includes a pigment, an alkali metal hydrogencarbonate, and water. An amount of the pigment and an amount of the alkali metal hydrogencarbonate satisfy Condition (1): Condition (1): 7.5≤A/B. A is a solid amount of the pigment by mass in the water-based ink relative to a total mass of the water-based ink, and B is the amount of the alkali metal hydrogencarbonate by mass in the water-based ink relative to the total mass of the water-based ink. A pH of the water-based ink is preferably less than 9.2. A pH of the water-based ink after a storage of the water-based ink at 60° C. for 1 week is preferably 7.8 or more. A change in pH between before the storage and after the storage is preferably 10% or less.

A water-based ink includes a pigment, an alkali metal hydrogencarbonate, and water. An amount of the pigment and an amount of the alkali metal hydrogencarbonate satisfy Condition (1): Condition (1): 7.5≤A/B. A is a solid amount of the pigment by mass in the water-based ink relative to a total mass of the water-based ink, and B is the amount of the alkali metal hydrogencarbonate by mass in the water-based ink relative to the total mass of the water-based ink. A pH of the water-based ink is preferably less than 9.2. A pH of the water-based ink after a storage of the water-based ink at 60° C. for 1 week is preferably 7.8 or more. A change in pH between before the storage and after the storage is preferably 10% or less.

A printing device includes an ink, an ink heating unit, and an ink discharging unit. The ink includes water, a metal pigment, and a resin. A mass ratio of the resin to the metal pigment is 0.1 or greater but 2 or less. A proportion of the water in the ink is 1% by mass or greater but 30% by mass or less. The ink heating unit is configured to heat the ink. The ink discharging unit is configured to discharge the ink heated.

According to an embodiment of the present disclosure, provided is an ink jet ink composition which is a solvent-based ink, the composition including a metal pigment and an organic solvent, in which the metal pigment is a metal particle having a surface treated with a surface treatment agent, the surface treatment agent contains a compound represented by General Formula (1) and a compound represented by General Formula (2), and a mass ratio of a mass of the compound represented by General Formula (2) to a total mass of the compound represented by General Formula (1) and the compound represented by General Formula (2) is 45% by mass or less.

(R—O—)P(O)(OH).sub.2  (1)

(R—O—).sub.2P(O)(OH)  (2)

(In the formulae, R's each independently represent a hydrocarbon group having 8 or more carbon atoms.)

According to an embodiment of the present disclosure, provided is an ink jet ink composition which is a solvent-based ink, the composition including a metal pigment and an organic solvent, in which the metal pigment is a metal particle having a surface treated with a surface treatment agent, the surface treatment agent contains a compound represented by General Formula (1) and a compound represented by General Formula (2), and a mass ratio of a mass of the compound represented by General Formula (2) to a total mass of the compound represented by General Formula (1) and the compound represented by General Formula (2) is 45% by mass or less.

(R—O—)P(O)(OH).sub.2  (1)

(R—O—).sub.2P(O)(OH)  (2)

(In the formulae, R's each independently represent a hydrocarbon group having 8 or more carbon atoms.)