A method of manufacturing of an ink (100) composition comprises a biphasic ligand exchange process. A first phase liquid (10) comprising a nonpolar solvent (11) with a colloidal suspension of nanoparticles (1) that are capped with a shell of non polar ligands (2) is contacted with a second phase liquid (20) comprising a polar solvent (21) with second ligand (3). The second ligand comprises at least one surface binding head group that has an affinity for binding to the nanoparticle; and an ionically charged tail group. The second ligands displace the first ligands to form a dispersion of the nanoparticles that are capped with a shell of the second ligands in the second phase liquid. The nanoparticles can be separated from the second phase liquid. The separated nanoparticles can be (re)dispersed in a printable liquid medium, e.g. used for printing a photoactive layer.

A method for producing a resin syringe includes: a preparation step including: preparing a syringe body made of polyolefin, and preparing an ink comprising components including a volatile solvent that contains a dissolving component for dissolving the polyolefin, chlorinated polypropylene having a degree of chlorination in a range of 15 to 30%, a colorant, and a filler; an application step including applying the ink to at least a part of an outer surface of the syringe body, such that at least a part of the outer surface of the syringe body is dissolved by the dissolving component to form a plurality of recessed portions in the outer surface, each of the plurality of recessed portions is filled with at least one of the components of the ink; and a drying step including drying the applied ink to form a printing layer.

A method for producing a resin syringe includes: a preparation step including: preparing a syringe body made of polyolefin, and preparing an ink comprising components including a volatile solvent that contains a dissolving component for dissolving the polyolefin, chlorinated polypropylene having a degree of chlorination in a range of 15 to 30%, a colorant, and a filler; an application step including applying the ink to at least a part of an outer surface of the syringe body, such that at least a part of the outer surface of the syringe body is dissolved by the dissolving component to form a plurality of recessed portions in the outer surface, each of the plurality of recessed portions is filled with at least one of the components of the ink; and a drying step including drying the applied ink to form a printing layer.

Opaque grey ink jet ink composition, comprising: a solvent comprising one or more organic solvent compound(s); b) a binder, comprising one or more binding resin(s); wherein the ink jet ink composition further comprises: one or more black pigment(s) and/or one or more black dye(s); one or more white pigment(s); wherein the one or more black pigment(s) and/or the one or more black dye(s) is(are) present in a total amount from 0.01% to 9% by weight, of the total weight of the ink jet ink composition; wherein the one or more white pigment(s) is(are) present in a total amount from 0.5% to 30% by weight, of the total weight of the ink jet ink composition; and wherein the ratio:amount by weight of the one or more black pigment(s) and/or the one or more black dye(s)/amount by weight of the one or more white pigment(s) is from 0.001 to 1.

Opaque grey ink jet ink composition, comprising: a solvent comprising one or more organic solvent compound(s); b) a binder, comprising one or more binding resin(s); wherein the ink jet ink composition further comprises: one or more black pigment(s) and/or one or more black dye(s); one or more white pigment(s); wherein the one or more black pigment(s) and/or the one or more black dye(s) is(are) present in a total amount from 0.01% to 9% by weight, of the total weight of the ink jet ink composition; wherein the one or more white pigment(s) is(are) present in a total amount from 0.5% to 30% by weight, of the total weight of the ink jet ink composition; and wherein the ratio:amount by weight of the one or more black pigment(s) and/or the one or more black dye(s)/amount by weight of the one or more white pigment(s) is from 0.001 to 1.

An ink jet recording method according to the present embodiment includes ejecting a water-based ink composition where a content of an organic solvent having a standard boiling point of 280° C. or more is 0.5% by mass or less from a head nozzle and attaching the water-based ink composition to a recording medium, in which a contact angle between at least a part of the surface of the member in contact with the water-based ink composition in the members in the head and the water-based ink composition is 30° or less, and the surface of the member in contact with the water-based ink composition is formed of a material having an SP value of 9 or less.

An ink jet recording method according to the present embodiment includes ejecting a water-based ink composition where a content of an organic solvent having a standard boiling point of 280° C. or more is 0.5% by mass or less from a head nozzle and attaching the water-based ink composition to a recording medium, in which a contact angle between at least a part of the surface of the member in contact with the water-based ink composition in the members in the head and the water-based ink composition is 30° or less, and the surface of the member in contact with the water-based ink composition is formed of a material having an SP value of 9 or less.

A near-infrared curable ink composition on a predetermined substrate that has excellent adhesion to the substrate when irradiated with near-infrared rays and cured, a near-infrared curable film obtained from the near-infrared curable ink composition, and stereolithography using the near-infrared curable ink composition, and contains composite tungsten oxide fine particles as near-infrared absorbing fine particles and uncured thermosetting resin, wherein the composite tungsten oxide fine particles have a XRD peak top intensity ratio value of 0.13 or more based on a XRD peak intensity ratio value of 1 on plane (220) of a silicon powder standard sample (640c produced by NIST).

A near-infrared curable ink composition on a predetermined substrate that has excellent adhesion to the substrate when irradiated with near-infrared rays and cured, a near-infrared curable film obtained from the near-infrared curable ink composition, and stereolithography using the near-infrared curable ink composition, and contains composite tungsten oxide fine particles as near-infrared absorbing fine particles and uncured thermosetting resin, wherein the composite tungsten oxide fine particles have a XRD peak top intensity ratio value of 0.13 or more based on a XRD peak intensity ratio value of 1 on plane (220) of a silicon powder standard sample (640c produced by NIST).

A colored special effect ink includes a special effect pigment and a colored pigment. The colored pigment is more hydrophobic than the special effect pigment, and the colored pigment is miscible in a solvent chosen from the group consisting of alcohols, ethers, esters, ketones, and water. The colored pigment optionally has a surface energy of less than 35 dynes/cm. A method for preparing the colored special effect ink and treating the colored pigment to form the colored special effect ink are also described.