Provided is a processing fluid including nonionic acrylic resin particles, and a polyvalent metal salt. A volume average particle diameter of the nonionic acrylic resin particles is 100 nm or greater but 300 nm or less. A proportion of the nonionic acrylic resin particles in the processing fluid is greater than 2.0% by mass. An average reflectance of the processing fluid to light having a wavelength of 400 nm or greater but 700 nm or less is 70% or greater.

A glittery ink contains glittery pigment particles, resin particles, and an organic solvent, wherein the following relationships are satisfied: a≤c≤b and a<b, where a represents the particle diameter of the resin particles corresponding to the minimum of two or more peaks in a particle size distribution as measured by a dynamic light scattering particle size distribution measuring device, b represents the particle diameter of the resin particles corresponding to the maximum of the two or more peaks in the particle size distribution, and c represents the particle diameter of the glittery pigment corresponding to a maximum number of particles in a particle size distribution as measured by the dynamic light scattering particle size distribution measuring device.

A white ink composition which is an aqueous ink jet ink, includes a white colorant and a fixing resin, and the fixing resin contains an acrylic-based resin having an acid value of 50.0 to 100.0 mgKOH/g and a glass transition temperature of 20.0° C. to 50.0° C.

A white ink composition which is an aqueous ink jet ink, includes a white colorant and a fixing resin, and the fixing resin contains an acrylic-based resin having an acid value of 50.0 to 100.0 mgKOH/g and a glass transition temperature of 20.0° C. to 50.0° C.

An aqueous dispersion contains water and resin particles containing a resin, wherein the resin particles contains pigment-enclosed resin particles containing an inorganic pigment enclosed in the resin, wherein the pigment-enclosed resin particles have a 50 percent cumulative volume particle diameter (D50) of from 40 to 200 nm and a 90 percent cumulative volume particle diameter (D90) of from 70 to 500 nm as measured by laser diffraction scattering, wherein the pigment-enclosed resin particles have an average aspect ratio of from 1.0 to 1.5.

An ink composition for forming an electron transport region in a light emitting element includes inorganic nanoparticles and a first solvent having a Hansen solubility parameter hydrogen bonding term (δH) value of 5 or less in order to increase dispersion stability of the inorganic nanoparticles, and thereby prevent or reduce nozzle clogging in the head of an inkjet printing device.

The present invention provides a pigment water dispersion that is excellent in dispersion stability, and also excellent in ejection properties even when used as an ink for ink-jet printing. The present invention relates to [1] a pigment water dispersion containing (A) a pigment, (B) a carboxy group-containing crosslinked polymer and (C) an alkyl group-containing ethanolamine having a pKa of not less than 8.7, [2] a water-based ink containing the pigment water dispersion, an organic solvent and a surfactant, and [3] a process for producing a pigment water dispersion, including step (I) of subjecting a mixture containing the pigment (A), a crosslinkable polymer, the aforementioned ethanolamine (C), an organic solvent and water to dispersion treatment, thereby obtaining a dispersion of pigment-containing polymer particles containing the pigment (A) and the crosslinkable polymer that is adhered onto the pigment (A); step (II) of removing the organic solvent from the obtained dispersion, thereby obtaining a water dispersion of the pigment-containing polymer particles; and step (III) of further subjecting the polymer to crosslinking reaction with a crosslinking agent, thereby obtaining the pigment water dispersion containing pigment-containing crosslinked polymer (B) particles.

The present invention provides a pigment water dispersion that is excellent in dispersion stability, and also excellent in ejection properties even when used as an ink for ink-jet printing. The present invention relates to [1] a pigment water dispersion containing (A) a pigment, (B) a carboxy group-containing crosslinked polymer and (C) an alkyl group-containing ethanolamine having a pKa of not less than 8.7, [2] a water-based ink containing the pigment water dispersion, an organic solvent and a surfactant, and [3] a process for producing a pigment water dispersion, including step (I) of subjecting a mixture containing the pigment (A), a crosslinkable polymer, the aforementioned ethanolamine (C), an organic solvent and water to dispersion treatment, thereby obtaining a dispersion of pigment-containing polymer particles containing the pigment (A) and the crosslinkable polymer that is adhered onto the pigment (A); step (II) of removing the organic solvent from the obtained dispersion, thereby obtaining a water dispersion of the pigment-containing polymer particles; and step (III) of further subjecting the polymer to crosslinking reaction with a crosslinking agent, thereby obtaining the pigment water dispersion containing pigment-containing crosslinked polymer (B) particles.

A method for manufacturing laminated printed matter includes the steps of ejecting, by an ink jet process, a colorant-containing active-radiation-curable ink composition onto a recording medium; ejecting, by an ink jet process, a colorant-free or white-pigment-containing active-radiation-curable ink composition into a non-image area adjoining an image area formed by the colorant-containing ink composition; curing the ejected colorant-containing ink composition and the ejected colorant-free or white-pigment-containing ink composition by irradiation with active radiation to form an image layer; and laminating a lamination film on a surface on which the image layer has been formed. Laminated printed matter has, in sequence, an image layer and a lamination film. The image layer is composed of an image area and a non-image area. The non-image area is formed of a cured product selected from the group consisting of transparent cured products and white cured products. The non-image area adjoins a side of the image area in a direction along the plane of the recording medium.

A method for manufacturing laminated printed matter includes the steps of ejecting, by an ink jet process, a colorant-containing active-radiation-curable ink composition onto a recording medium; ejecting, by an ink jet process, a colorant-free or white-pigment-containing active-radiation-curable ink composition into a non-image area adjoining an image area formed by the colorant-containing ink composition; curing the ejected colorant-containing ink composition and the ejected colorant-free or white-pigment-containing ink composition by irradiation with active radiation to form an image layer; and laminating a lamination film on a surface on which the image layer has been formed. Laminated printed matter has, in sequence, an image layer and a lamination film. The image layer is composed of an image area and a non-image area. The non-image area is formed of a cured product selected from the group consisting of transparent cured products and white cured products. The non-image area adjoins a side of the image area in a direction along the plane of the recording medium.