The disclosure relates to ink compositions for digital printing on an external surface of a plastic article. The ink compositions comprise an ink removal-promoting additive. In some aspects, the ink removal-promoting additive can facilitate the separation or loosening of the image from the external surface of the article when the image is exposed to a liquid-based solution at an elevated temperature. Also disclosed are recyclable plastic articles having an external surface with an image printed thereon using the disclosed ink composition and methods for removing cured ink from a plastic container. This abstract is intended as a scanning tool for purposes of searching in the particular art and is not intended to be limiting of the present invention.

The disclosure relates to ink compositions for digital printing on an external surface of a plastic article. The ink compositions comprise an ink removal-promoting additive. In some aspects, the ink removal-promoting additive can facilitate the separation or loosening of the image from the external surface of the article when the image is exposed to a liquid-based solution at an elevated temperature. Also disclosed are recyclable plastic articles having an external surface with an image printed thereon using the disclosed ink composition and methods for removing cured ink from a plastic container. This abstract is intended as a scanning tool for purposes of searching in the particular art and is not intended to be limiting of the present invention.

This disclosure describes hydrogel three-dimensional printing kits, methods of three-dimensional printing hydrogels, and hydrogel three-dimensional printing systems. In one example, a hydrogel three-dimensional printing kit can include a particulate build material, a crosslinking agent, a whitening agent, and a coloring agent. The particulate build material can include a polyhydroxylated swellable polymer. The crosslinking agent can include water and a crosslinker that is reactive with hydroxyl groups of the polyhydroxylated swellable polymer to crosslink the polyhydroxylated swellable polymer. The whitening agent can include water and a dispersed white pigment. The coloring agent can include water and a colorant.

This disclosure describes hydrogel three-dimensional printing kits, methods of three-dimensional printing hydrogels, and hydrogel three-dimensional printing systems. In one example, a hydrogel three-dimensional printing kit can include a particulate build material, a crosslinking agent, a whitening agent, and a coloring agent. The particulate build material can include a polyhydroxylated swellable polymer. The crosslinking agent can include water and a crosslinker that is reactive with hydroxyl groups of the polyhydroxylated swellable polymer to crosslink the polyhydroxylated swellable polymer. The whitening agent can include water and a dispersed white pigment. The coloring agent can include water and a colorant.

A cleaning liquid contains water, a surfactant, and glycol ether. The surfactant includes both a silicone surfactant and a betaine surfactant. The glycol ether has a percentage content of at least 5.0% by mass and no greater than 15.0% by mass relative to the mass of the cleaning liquid. The cleaning liquid has a viscosity at 25° C. of 10.0 mPa.Math.s.

A cleaning liquid contains water, a surfactant, and glycol ether. The surfactant includes both a silicone surfactant and a betaine surfactant. The glycol ether has a percentage content of at least 5.0% by mass and no greater than 15.0% by mass relative to the mass of the cleaning liquid. The cleaning liquid has a viscosity at 25° C. of 10.0 mPa.Math.s.

A dye printing treatment liquid composition to be adhered to a cloth, includes: a polyester resin having a glass transition temperature of 40° C. or more; a cross-linking agent; and water, and the cloth contains fibers which have hydroxy groups.

A dye printing treatment liquid composition to be adhered to a cloth, includes: a polyester resin having a glass transition temperature of 40° C. or more; a cross-linking agent; and water, and the cloth contains fibers which have hydroxy groups.

A pigment dispersion for an inkjet ink contains pigment particles, styrene-acrylic resin, and water. The styrene-acrylic resin includes a first repeating unit having a group represented by formula (1) and a second repeating unit not having a repeating unit represented by formula (1).

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The first repeating unit has a percentage content to the total mass of the first repeating unit and the second repeating unit of at least 1% by mass and no greater than 10% by mass. In formula (1), R.sup.1 represents a hydrogen atom or a methyl group, R.sup.2 represents a hydrogen atom or an alkyl group with a carbon number of at least 1 and no greater than 7, and m.sub.1 represents an integer of at least 4 and no greater than 9.

A pigment dispersion for an inkjet ink contains pigment particles, styrene-acrylic resin, and water. The styrene-acrylic resin includes a first repeating unit having a group represented by formula (1) and a second repeating unit not having a repeating unit represented by formula (1).

##STR00001##

The first repeating unit has a percentage content to the total mass of the first repeating unit and the second repeating unit of at least 1% by mass and no greater than 10% by mass. In formula (1), R.sup.1 represents a hydrogen atom or a methyl group, R.sup.2 represents a hydrogen atom or an alkyl group with a carbon number of at least 1 and no greater than 7, and m.sub.1 represents an integer of at least 4 and no greater than 9.