A liquid developer containing toner particles containing a resin binder and a colorant, an amino group-containing copolymer, and an insulating liquid, wherein the resin binder contains a polyester-based resin, and wherein the amino group-containing copolymer is a polymerized product of a monomer A having an amino group and a monomer B represented by the formula (I):

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wherein R.sup.1 is a hydrogen atom or a hydrocarbon group having 1 or more carbon atoms and 5 or less carbon atoms; and R.sup.2 is a hydrocarbon group having 1 or more carbon atoms and 22 or less carbon atoms, which may have a substituent, wherein the liquid developer satisfies: Requirement 1: an amine value of the amino group-containing copolymer of 165 mgKOH/g or more, and a conductivity of the liquid developer being 5.010.sup.9 S/m or less; or Requirement 2: the liquid developer further containing an acid compound. The liquid developer of the present invention is suitably used in development or the like of latent images formed in, for example, electrophotography, electrostatic recording method, electrostatic printing method or the like.

A binder resin of toner particles in a liquid developer contains a resin having a monomer unit derived from at least one polymerizable monomer selected from the group consisting of (meth)acrylates with an alkyl group having 18 to 36 carbon atoms, and the binder resin has an SP value higher by 1.5 (J/cm.sup.3).sup.0.5 or more than the SP value of a carrier liquid.

A liquid developer containing a resin binder, a colorant, a dispersant, and an insulating liquid, wherein the resin binder contains a resin having an acidic group, and wherein the dispersant contains a dispersant X having at least one basic nitrogen-containing group selected from the group consisting of an amino group, an imino group, a cyano group, an azo group, a diazo group, and an azide group, and wherein a melting point of the dispersant X is 34 C. or higher; and a method for printing a fused image using the liquid developer. The liquid developer of the present invention is suitably used in development or the like of latent images formed in, for example, electrophotography, electrostatic recording method, electrostatic printing method or the like.

The present disclosure relates to an electrophotographic active ink composition comprising a thermoplastic polymer comprising a copolymer of an olefin and acrylic acid and/or metacrylic acid; active photovoltaic material comprising electron donor material and electron acceptor material; a charge adjuvant, and a liquid carrier.

Herein is described a liquid electrophotographic ink composition including a carrier liquid and a resin including an acid copolymer and an acrylate copolymer, wherein the acrylate copolymer includes at least about 30 wt. % of the alkyl (meth)acrylate monomer.

According to an example, a resin, a carrier liquid, and a pearlescent pigment may be mixed to form a liquid electrophotographic ink.

A liquid developer containing a liquid carrier and a toner particle that is insoluble in the liquid carrier, wherein a particular substructure is bonded through a covalent bond to a surface of the toner particle, and a method of producing a liquid developer containing a liquid carrier and a toner particle that is insoluble in the liquid carrier, the method comprising a step (I) of covalently bonding, to a surface of the toner particle, a compound having a particular substructure.

An electrostatic ink composition is disclosed. The electrostatic ink composition can comprise: a liquid carrier; and particles dispersed in the liquid carrier, wherein the particles comprise a thermoplastic resin, and a metal or metal alloy pigment having a melting of point of less than about 200 C. The metal or metal alloy pigment can have a diameter of from about 0.01 m to about 50 m.

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.

Herein is disclosed an electrostatic ink composition. In some examples, the electrostatic ink compositions comprise: a carrier liquid; a resin; and a phosphorescent pigment.