An inkjet ink includes a polyurethane binder particle including at least two polyurethane polymers; a pigment; and an aqueous vehicle. A first of the at least two polyurethane polymers has a first backbone chain formed from a first diisocyanate, a first hydrophobic graft diol, a first polycarbonate based diol, and a sulfonated diamine. A second of the at least two polyurethane polymer has a second backbone chain formed from a second diisocyanate, a second hydrophobic graft diol, and a second polycarbonate based diol, and includes a mono-amino substituted sulfonic acid as its capping moiety.

An inkjet ink includes a polyurethane binder particle including at least two polyurethane polymers; a pigment; and an aqueous vehicle. A first of the at least two polyurethane polymers has a first backbone chain formed from a first diisocyanate, a first hydrophobic graft diol, a first polycarbonate based diol, and a sulfonated diamine. A second of the at least two polyurethane polymer has a second backbone chain formed from a second diisocyanate, a second hydrophobic graft diol, and a second polycarbonate based diol, and includes a mono-amino substituted sulfonic acid as its capping moiety.

Provided is an oil-based inkjet ink containing a pigment and a fatty acid ester-based solvent represented by general formula (1) shown below and having at least 18 but not more than 29 carbon atoms per molecule. In general formula (1), R.sup.1 represents an alkyl group of 5 or more carbon atoms, R.sup.2 represents an alkyl group of 6 or more carbon atoms, and at least one of R.sup.1 and R.sup.2 is a branched alkyl group of 9 or more carbon atoms having a side chain of 4 or more carbon atoms. ##STR00001##

Provided is an oil-based inkjet ink containing a pigment and a fatty acid ester-based solvent represented by general formula (1) shown below and having at least 18 but not more than 29 carbon atoms per molecule. In general formula (1), R.sup.1 represents an alkyl group of 5 or more carbon atoms, R.sup.2 represents an alkyl group of 6 or more carbon atoms, and at least one of R.sup.1 and R.sup.2 is a branched alkyl group of 9 or more carbon atoms having a side chain of 4 or more carbon atoms. ##STR00001##

In one aspect, provided is a method for producing a semiconducting single-walled carbon nanotube dispersion. This method allows semiconducting single-walled carbon nanotubes to be separated from a single-walled carbon nanotube mixture containing semiconducting single-walled carbon nanotubes and metallic single-walled carbon nanotubes in an aqueous medium, and yet requires only an easily available separation agent and a simple operation.

One aspect of the present disclosure relates to a method for producing a semiconducting single-walled carbon nanotube dispersion. The method includes (A) preparing a single-walled carbon nanotube dispersion to be separated that contains single-walled carbon nanotubes composed of semiconducting single-walled carbon nanotubes and metallic single-walled carbon nanotubes, an aqueous medium, and a nonionic polymer containing a constitutional unit A derived from a monomer represented by the following formula (1), and (B) centrifuging the single-walled carbon nanotube dispersion to be separated and then collecting a supernatant containing the semiconducting single-walled carbon nanotubes from the centrifuged single-walled carbon nanotube dispersion. A content of the constitutional unit A in all constitutional units of the polymer is 2 mol % or more. The polymer is water soluble.

CH.sub.2═CR.sup.1—COO—(EO).sub.p(PO).sub.q—R.sup.2   (1)

The problem to be solved by the present invention is to provide an ink set that enables forming a printed article with reduced bleeding and color mixing. The present invention is an ink set that includes a black pigment ink (a) having a static surface tension (a1) of 20 mN/m to 40 mN/m and at least one pigment ink (b) selected from the group consisting of a magenta pigment ink and a yellow pigment ink. The static surface tension of the pigment ink (b) is smaller than static surface tension (a1) by 0.1 mN/m to 0.7 mN/m.

An ink composition contains a semi-drying solvent; a pigment; an alkyd resin; and an amine-based polymeric dispersant. The composition contains 5 wt% or more of the alkyd resin, based on the total weight of the composition, and 5 wt% or more of the amine-based polymeric dispersant, based on the total weight of the composition.

An aqueous ink jet ink composition is for use in an ink jet recording method. The method includes ejecting ink from an ink jet head including nozzles. The nozzles are configured such that a shape of a side wall surface is 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 pigment and a solvent that contains a specific compound.

An aqueous ink jet ink composition is for use in an ink jet recording method. The method includes ejecting ink from an ink jet head including nozzles. The nozzles are configured such that a shape of a side wall surface is 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 pigment and a solvent that contains a specific compound.

Provided is a method for the production of at least one carrier material provided with a print decoration. The print decoration is applied to the at least one carrier material by means of digital printing. The ink used for digital printing is a water-soluble CRYK ink containing at least one cyan pigment, at least one red pigment from the group of quinacridone pigments, the yellow pigment PY181, and at least one black carbon pigment.