Abstract: A liquid electrophotographic ink composition is disclosed herein. One example of the liquid electrophotographic ink composition includes a resin, a liquid carrier, a pigment chosen from titanium oxide, and a spacer chosen from barium sulfate, calcium carbonate, clay, magnesium silicate and mixtures thereof, in an amount from 5 to 15 wt. % of the total solids of the composition. A method for making a liquid electrophotographic ink composition is also disclosed herein.

Abstract: Described herein is a liquid electrophotographic ink composition comprising: a thermoplastic resin comprising a polymer having acidic side groups; a charge adjuvant comprising a complex of a metal(II) cation and two monovalent anions; or a complex of a metal(III) cation and three monovalent anions; or a complex of a metal(III) cation, a monovalent anion and a divalent anion, wherein each monovalent anion is independently selected from carboxylate anions having from 2 to 16 carbon atoms and alkoxide anions having from 1 to 16 carbon atoms; and wherein the divalent anion is selected form the oxo group, dicarboxylate anions having from 2 to 16 carbon atoms, and dialkoxide anions having from 1 to 16 carbon atoms; and a liquid carrier. Also described herein is a method of producing the liquid electrophotographic ink composition and a printed substrate.

Abstract: Disclosed herein is a liquid electrophotographic ink composition comprising a resin comprising a copolymer of an alkylene monomer and a monomer selected from acrylic acid and methacrylic acid; a liquid carrier; and an anti-caking agent present in an amount of up to 1 wt. % of the total solids of the composition. Also disclosed is a method of printing the liquid electrophotographic ink composition and a printed substrate.

Abstract: A liquid electrophotographic ink composition is disclosed herein. One example of the liquid electrophotographic ink composition includes a resin, a liquid carrier, a pigment chosen from titanium oxide, and a spacer chosen from barium sulfate, calcium carbonate, clay, magnesium silicate and mixtures thereof, in an amount from 5 to 15 wt. % of the total solids of the composition. A method for making a liquid electrophotographic ink composition is also disclosed herein.

Abstract: A method for producing a cyan liquid electrophotographic ink composition includes: dispersing in a first portion of carrier fluid cyan pigment particles and inorganic spacer particles, the inorganic spacer particles having a particle size (d50) of 0.1 ?m or less, such that the inorganic spacer particles adhere to the cyan pigment particles; heating a polymer resin in a second portion of carrier fluid to dissolve the polymer resin; adding the dispersion of the cyan pigment particles having the inorganic spacer particles adhered thereto in the first portion of carrier fluid to the dissolved polymer resin in the second portion of carrier fluid; cooling the carrier fluid at a controlled rate to effect precipitation of the polymer resin from the carrier fluid such that a coating of the resin is formed on the cyan pigment particles having the inorganic spacer particles adhered thereto, thereby producing the cyan liquid electrophotographic ink composition.

Abstract: The present disclosure relates to a method for producing a conductive liquid electrophotographic ink composition. The method comprises: heating a polymer resin in a carrier liquid to dissolve the polymer resin; adding conductive metallic pigment Particles to the carrier liquid; and cooling the carrier liquid to effect precipitation of the polymer resin from the carrier liquid, such that a coating comprising the resin is formed on the conductive metallic pigment particles; wherein: I) the polymer resin comprises (i) a copolymer of an alkylene monomer and a monomer selected from acrylic acid and methacrylic acid, and (ii) an ionomer of an alkylene monomer and a monomer selected from acrylic acid and methacrylic acid, wherein at least a portion of the acrylic acid and/or methacrylic acid groups are neutralised with metal ions; and/or II) a charge adjuvant is included in the coating that is formed on the conductive metallic pigment particles.

Abstract: A method for coating pigment particles is provided, the method comprising heating a polymer resin in a carrier fluid to dissolve the polymer resin, suspending in the carrier fluid the pigment particles to be coated; and effecting precipitation of the polymer resin from the carrier fluid, such that a coating of the resin is formed on the pigment particles.

Abstract: A method for coating pigment particles is provided, the method comprising heating a polymer resin in a carrier fluid to dissolve the polymer resin; suspending in the carrier fluid white pigment particles to be coated; and cooling the carrier fluid at a rate of 2° C./hr or less to effect precipitation of the polymer resin from the carrier fluid such that a coating of the resin is formed on the pigment particles, thereby producing the white liquid electrophotographic ink composition.

Abstract: A method for coating pigment particles is provided, the method comprising heating a polymer resin in a carrier fluid to dissolve the polymer resin; suspending in the carrier fluid white pigment particles to be coated; cooling the carrier fluid to effect precipitation of the polymer resin from the carrier fluid such that a coating of the resin is at least partially formed on the pigment particles; reheating the suspension of partially coated white pigment particles in the carrier fluid; and cooling the carrier fluid at a controlled rate to effect precipitation of the polymer resin from the carrier fluid such that a coating of the resin is formed on the pigment particles, thereby producing the white liquid electrophotographic ink composition.

Abstract: A method for coating pigment particles is provided, the method comprising heating a polymer resin in a carrier fluid to dissolve the polymer resin; suspending in the carrier fluid white pigment particles to be coated; and cooling the carrier fluid at a rate of 2° C./hr or less to effect precipitation of the polymer resin from the carrier fluid such that a coating of the resin is formed on the pigment particles, thereby producing the white liquid electrophotographic ink composition.

Abstract: A method for coating pigment particles is provided, the method comprising heating a polymer resin in a carrier fluid to dissolve the polymer resin, suspending in the carrier fluid the pigment particles to be coated; and effecting precipitation of the polymer resin from the carrier fluid, such that a coating of the resin is formed on the pigment particles.

Abstract: A method for coating pigment particles is provided, the method comprising heating a polymer resin in a carrier fluid to dissolve the polymer resin; suspending in the carrier fluid white pigment particles to be coated; cooling the carrier fluid to effect precipitation of the polymer resin from the carrier fluid such that a coating of the resin is at least partially formed on the pigment particles; reheating the suspension of partially coated white pigment particles in the carrier fluid; and cooling the carrier fluid at a controlled rate to effect precipitation of the polymer resin from the carrier fluid such that a coating of the resin is formed on the pigment particles, thereby producing the white liquid electrophotographic ink composition.