Abstract: Herein is described a liquid electrophotographic (LEP) ink composition comprising: a hydrocarbon carrier liquid; a resin; a colorant comprising a conjugated compound; and a component selected from: an amine-containing basic dispersant having a total base number greater than about 300 mgKOH/g material; or an amine-containing compound having a pKa of 8 or more at 25° C.; or urea.

Abstract: In an example, a method includes providing a print agent with chargeable particles in a carrier fluid to a print agent concentration apparatus. The print agent may be passed between a conveyor and an electrode, and a potential applied to cause the chargeable particles to be attracted to the conveyor and to form a concentrated layer of particles on the conveyor. An indicator of particle concentration in the concentrated layer may be measured. It may be determined if the indicator of particle concentration meets predetermined criteria.

Abstract: In an example, a method includes providing a print agent with chargeable particles in a carrier fluid to a print agent concentration apparatus. The print agent may be passed between a conveyor and an electrode, and a potential applied to cause the chargeable particles to be attracted to the conveyor and to form a concentrated layer of particles on the conveyor. An indicator of particle concentration in the concentrated layer may be measured. It may be determined if the indicator of particle concentration meets predetermined criteria.

Abstract: In an example, a method includes providing a print agent comprising chargeable particles in a carrier fluid to a print agent concentration apparatus (600). The print agent may be passed between a conveyor (604) and an electrode (602), and a potential applied to cause the chargeable particles to be attracted to the conveyor and to form a concentrated layer of particles on the conveyor. A proportion of the carrier fluid may be separated from the concentrated layer of particles and a thickness of a remaining layer on the conveyor may be measured. It may be determined if the measured thickness of the layer meets predetermined criteria and, if not, an operational parameter of the print agent concentration apparatus may be adjusted.

Abstract: Herein is described a method of applying foil from a foil web to a substrate. The method may comprise: ink-jet printing a UV-curable adhesive onto the substrate in a predetermined image area; subjecting the adhesive to a first curing by exposing the adhesive to UV light in a dosage range of 140-170 mJ/cm2; passing the substrate and a foil web through a nip where the foil web is pressed against the adhesive; subjecting the adhesive disposed between the substrate and the foil web to a second curing by exposing the adhesive to UV light in a dosage of at least 250 mJ/cm2; and separating excess foil from the substrate, to leave foil on the predetermined image area. Substrates and UV-curable adhesives are also described.

Abstract: In an example, a method includes providing a print agent comprising chargeable particles in a carrier fluid to a print agent concentration apparatus (600). The print agent may be passed between a conveyor (604) and an electrode (602), and a potential applied to cause the chargeable particles to be attracted to the conveyor and to form a concentrated layer of particles on the conveyor. A proportion of the carrier fluid may be separated from the concentrated layer of particles and a thickness of a remaining layer on the conveyor may be measured. It may be determined if the measured thickness of the layer meets predetermined criteria and, if not, an operational parameter of the print agent concentration apparatus may be adjusted.

Abstract: The present disclosure relates to a liquid electrophotographic composition comprising: a polymer resin comprising a side group comprising a cross-linkable moiety; and a carrier liquid.

Abstract: Herein is disclosed an electrostatic ink composition. The composition may comprise: pigment particles; a dispersant; a carrier liquid; a charge director comprising lecithin or a sulfate-based lipophilic moiety; and a tackifier which is dissolved in the carrier liquid.

Abstract: A liquid electrophotographic varnish composition comprising: a polymer resin; an epoxy-based cross-linking agent; a solid catalyst comprising at least one amine group; and a carrier liquid.

Abstract: Herein is described a method of applying foil from a foil web to a substrate. The method may comprise: ink-jet printing a UV-curable adhesive onto the substrate in a predetermined image area; subjecting the adhesive to a first curing by exposing the adhesive to UV light in a dosage range of 140-170 mJ/cm2; passing the substrate and a foil web through a nip where the foil web is pressed against the adhesive; subjecting the adhesive disposed between the substrate and the foil web to a second curing by exposing the adhesive to UV light in a dosage of at least 250 mJ/cm2; and separating excess foil from the substrate, to leave foil on the predetermined image area. Substrates and UV-curable adhesives are also described.

Abstract: The present disclosure relates to a liquid electrophotographic composition comprising: a polymer resin comprising a side group comprising a cross-linkable moiety; and a carrier liquid.

Abstract: Herein is disclosed an electrostatic ink composition. The composition may comprise: pigment particles; a dispersant; a carrier liquid; a charge director comprising lecithin or a sulfate-based lipophilic moiety; and a tackifier which is dissolved in the carrier liquid.

Abstract: A liquid electrophotographic varnish composition comprising: a polymer resin; an epoxy-based cross-linking agent; a solid catalyst comprising at least one amine group; and a carrier liquid.

Abstract: Methods of printing articles using a photo-curable adhesion promoter and varnish composition jetted onto a media substrate, and a printed article are described.

Abstract: Methods of printing articles using a photo-curable adhesion promoter and varnish composition jetted onto a media substrate, and a printed article are described.

Abstract: The present invention is drawn to ink compositions and methods for ink-jet recording. The ink compositions can include a non-aqueous HAPS-free solvent system; a binder system, including at least one of i) an acrylic resin, or ii) a first vinyl chloride-vinyl acetate resin, which is at least substantially soluble in the solvent system; and a pigment milled in the presence of a second vinyl chloride-vinyl acetate resin. Further, at least one solvent of the solvent system can serve as a dispersing and diluent solvent for the pigment.