An aqueous ink jet ink composition according to the present embodiment is an aqueous ink jet ink composition for use in an ink jet recording method that includes ejecting ink from an ink jet head. The ink jet head includes nozzles that have a side wall surface, and the side wall surface has a scalloped shape in which a scallop width S1 and a notch depth S2 satisfy S1/S2≥4. The aqueous ink jet ink composition includes a self-dispersed pigment and a solvent that includes a compound represented by formula (1) below.

R.sub.1—O—R.sub.2—OH  (1)

In formula (1), R.sub.1 represents a hydrogen atom, a methyl group, or an ethyl group, and R.sub.2 represents a divalent saturated hydrocarbon group having 5 or fewer carbon atoms or represents a group represented by formula (2) below.

R.sub.3—O—R.sub.4  (2)

In formula (2), R.sub.3 and R.sub.4 each independently represent a divalent saturated hydrocarbon group having 2 or 3 carbon atoms.

An ink jet ink composition contains a color material, an organic solvent, and water. The ink jet ink composition contains N-hydroxyethylpyrrolidone and N-vinyl-2-pyrrolidone as the organic solvent.

An ink jet ink composition contains a color material, an organic solvent, and water. The ink jet ink composition contains N-hydroxyethylpyrrolidone and N-vinyl-2-pyrrolidone as the organic solvent.

The present invention relates to [1] a water-based ink for ink-jet printing, containing a carbodiimide compound, a pigment, a vinyl polymer and water, in which the vinyl polymer is a carboxyl group-containing polymer having an acid value of not more than 70 mgKOH/g, and the pigment is present in the form of pigment-containing polymer particles; [2] an ink set for ink-jet printing containing an aqueous composition containing the carbodiimide compound and water, and a water-based ink containing the aforementioned pigment and the aforementioned vinyl polymer; and [3] an ink-jet printing method including the step 1 of ejecting the carbodiimide compound, the pigment, the vinyl polymer and water onto a surface of a printing medium by an ink-jetting method to print characters or images thereon, and the step 2 of subjecting the resulting printed characters or images to heat treatment at a temperature of 50 to 200° C. According to the aqueous composition of the present invention, it is possible to obtain a printed material that is excellent in rub fatness.

The present invention relates to [1] a water-based ink for ink-jet printing, containing a carbodiimide compound, a pigment, a vinyl polymer and water, in which the vinyl polymer is a carboxyl group-containing polymer having an acid value of not more than 70 mgKOH/g, and the pigment is present in the form of pigment-containing polymer particles; [2] an ink set for ink-jet printing containing an aqueous composition containing the carbodiimide compound and water, and a water-based ink containing the aforementioned pigment and the aforementioned vinyl polymer; and [3] an ink-jet printing method including the step 1 of ejecting the carbodiimide compound, the pigment, the vinyl polymer and water onto a surface of a printing medium by an ink-jetting method to print characters or images thereon, and the step 2 of subjecting the resulting printed characters or images to heat treatment at a temperature of 50 to 200° C. According to the aqueous composition of the present invention, it is possible to obtain a printed material that is excellent in rub fatness.

Provided is an ink including water, an organic solvent, resin particles, a first inorganic pigment, and a second inorganic pigment. The first inorganic pigment comprises particulate titanium oxide. The second inorganic pigment comprises at least one selected from the group consisting of acicular titanium oxide, fusiform titanium oxide, and silica particles.

Provided is an ink including water, an organic solvent, resin particles, a first inorganic pigment, and a second inorganic pigment. The first inorganic pigment comprises particulate titanium oxide. The second inorganic pigment comprises at least one selected from the group consisting of acicular titanium oxide, fusiform titanium oxide, and silica particles.

An ink jet ink composition which is an aqueous ink includes a resin dispersion, in which the resin dispersion is a polyurethane resin dispersion formed of a polyurethane resin (U) obtained by reacting an active hydrogen atom-containing component (A) containing a high-molecular-weight polyol component (a1) having a number-average molecular weight of 500 or more and an organic polyisocyanate component (B), and the high-molecular-weight polyol component (a1) includes a polyolefin polyol (a11) having a constituent unit represented by General Formula (1) and/or a constituent unit represented by General Formula (2), and a polyester polyol (a12) having a constituent unit represented by General Formula (3).

An ink jet ink composition which is an aqueous ink includes a resin dispersion, in which the resin dispersion is a polyurethane resin dispersion formed of a polyurethane resin (U) obtained by reacting an active hydrogen atom-containing component (A) containing a high-molecular-weight polyol component (a1) having a number-average molecular weight of 500 or more and an organic polyisocyanate component (B), and the high-molecular-weight polyol component (a1) includes a polyolefin polyol (a11) having a constituent unit represented by General Formula (1) and/or a constituent unit represented by General Formula (2), and a polyester polyol (a12) having a constituent unit represented by General Formula (3).

A process for forming a conductive hemp-based ink comprising carbonizing hemp and reducing the particle size of said hemp via a milling process to between 2 and 5 microns, wherein said reduced size hemp particles are combined with at least one aqueous carrier to produce an ink, and wherein said ink is conductive.