The present disclosure describes multi-fluid kits for three-dimensional printing, three-dimensional printing kits, and methods of making three-dimensional printed articles. In one example, a multi-fluid kit for three-dimensional printing can include a fusing agent, a hydrophobizing agent, and a hydrophilizing agent. The fusing agent can include water and an electromagnetic radiation absorber, wherein the electromagnetic radiation absorber absorbs radiation energy and converts the radiation energy to heat. The hydrophobizing agent can include water and a hydrophobic additive including a first polymer having a hydrophobic group, a monomer that is polymerizable to form a first polymer having a hydrophobic group, or a combination thereof. The hydrophilizing agent can include water and a hydrophilic additive including a second polymer having a hydrophilic group.

The present disclosure describes multi-fluid kits for three-dimensional printing, three-dimensional printing kits, and methods of making three-dimensional printed articles. In one example, a multi-fluid kit for three-dimensional printing can include a fusing agent, a hydrophobizing agent, and a hydrophilizing agent. The fusing agent can include water and an electromagnetic radiation absorber, wherein the electromagnetic radiation absorber absorbs radiation energy and converts the radiation energy to heat. The hydrophobizing agent can include water and a hydrophobic additive including a first polymer having a hydrophobic group, a monomer that is polymerizable to form a first polymer having a hydrophobic group, or a combination thereof. The hydrophilizing agent can include water and a hydrophilic additive including a second polymer having a hydrophilic group.

An ink composition contains a first dye represented by formula (I)

##STR00001##

and a second dye represented by formula (II).

##STR00002##

An ink composition contains a first dye represented by formula (I)

##STR00001##

and a second dye represented by formula (II).

##STR00002##

A cationic polymer nanoparticle, functionalized with primary amines, characterized in that said nanoparticle comprises a resin having at least a) a repeating unit selected from the group consisting of an allyl amine and a vinyl amine, b) an oxalyl amide crosslinking unit and c) a repeating unit according to general formula (I) and/or general formula (II); the particle can be dispersed in an aqueous vehicle to be used in inkjet printing.

A cationic polymer nanoparticle, functionalized with primary amines, characterized in that said nanoparticle comprises a resin having at least a) a repeating unit selected from the group consisting of an allyl amine and a vinyl amine, b) an oxalyl amide crosslinking unit and c) a repeating unit according to general formula (I) and/or general formula (II); the particle can be dispersed in an aqueous vehicle to be used in inkjet printing.

An ink composition includes a fluid and a plurality of microcapsules suspended in the fluid. The fluid includes a first chemical compound that exhibits a first color characteristic in a first pH range and exhibits a second color characteristic in a second pH range, where the first color characteristic is visually distinct from the second color characteristic. A second chemical compound is contained within the microcapsules, such that rupturing at least a subset of the plurality of microcapsules releases the second chemical compound. Releasing the second chemical compound shifts a pH of the fluid from a first pH in the first pH range to a second pH in the second pH range.

A colored resin particle dispersion and an ink are provided which yield excellent abrasion resistance and prevent change in the color tone. Moreover, a colored resin particle dispersion and an inkjet ink are provided which exhibit excellent abrasion resistance, together with excellent water resistance and marker resistance. Specifically provided is a colored resin particle dispersion containing colored resin particles, a basic dispersant, and a non-aqueous solvent, wherein the colored resin particles include a colorant, a solid resin and a liquid organic compound having an acidic group, and the oxidation-reduction potential of the colored resin particle dispersion is 300 mV or less. Also provided is an inkjet ink containing this colored resin particle dispersion.

A colored resin particle dispersion and an ink are provided which yield excellent abrasion resistance and prevent change in the color tone. Moreover, a colored resin particle dispersion and an inkjet ink are provided which exhibit excellent abrasion resistance, together with excellent water resistance and marker resistance. Specifically provided is a colored resin particle dispersion containing colored resin particles, a basic dispersant, and a non-aqueous solvent, wherein the colored resin particles include a colorant, a solid resin and a liquid organic compound having an acidic group, and the oxidation-reduction potential of the colored resin particle dispersion is 300 mV or less. Also provided is an inkjet ink containing this colored resin particle dispersion.

An ink set including an aqueous inkjet ink composition and a primer composition. The aqueous inkjet ink composition contains a pigment, an alkali-soluble resin, a resin emulsion, a surfactant, a water-soluble solvent, and water; the resin emulsion contains a polyurethane resin emulsion and/or a polyolefin resin emulsion; the surfactant contains an alkyl sulfonate and/or a polyoxyethylene alkyl ether sulfate; the aqueous inkjet ink composition has a content of the alkyl sulfonate and/or the polyoxyethylene alkyl ether sulfate of 0.05% by mass or more and 0.5% by mass or less; and the primer composition contains an aggregation accelerator that accelerates aggregation of the aqueous inkjet ink composition. The ink set provides a printed matter having good print image quality and excellent abrasion resistance, and has good storage stability and ejection stability.