Herein is described a liquid electrostatic ink composition comprising a carrier liquid, a resin, a colorant selected from a magenta colorant, a cyan colorant and a black colorant, an amine-containing basic dispersant having a total base number (TBN) in the range of about 10 to about 65 mgKOH/g material, the amine-containing basic dispersant present in an amount from about 5 wt. % to about 40 wt. % by total weight of colorant.

A liquid developer containing toner particles containing a resin containing a polyester and a pigment, wherein the toner particles are dispersed in an insulating liquid in the presence of a dispersant, wherein the insulating liquid has a boiling point of 300 C. or lower, and wherein the insulating liquid has a peak intensity ratio of a methyl group calculated by the formula (1): $\begin{array}{cc}\mathrm{Peak}\mathrm{Intensity}\mathrm{Ratio}\left(\%\right)\mathrm{of}\mathrm{Methyl}\mathrm{Groups}=\frac{A}{A+B}100& \left(1\right)\end{array}$
wherein A is a peak intensity ascribed to CH.sub.3 stretching vibration when measured with a Fourier transform infrared spectrometer, B is a total peak intensity ascribed to CH.sub.2 stretching vibration and CH stretching vibration,
of 25% or more, or wherein the insulating liquid contains a polyisobutene.

A liquid developer containing toner particles containing a resin containing a polyester and a pigment, wherein the toner particles are dispersed in an insulating liquid in the presence of a dispersant, wherein the insulating liquid has an evaporation rate after holding at 40 C. for 30 minutes of less than 0.26% by mass; and a method for producing a liquid developer containing toner particles containing a resin containing a polyester and a pigment, wherein the toner particles are dispersed in an insulating liquid in the presence of a dispersant, including: step 1: melt-kneading a resin containing a polyester and a pigment, and pulverizing a kneaded product obtained, to provide toner particles; step 2: adding a dispersant to the toner particles obtained in the step 1, and dispersing the toner particles in an insulating liquid to provide a dispersion of toner particles, and step 3: subjecting the dispersion of toner particles obtained in the step 2 to wet-milling, to provide a liquid developer, wherein the insulating liquid has an evaporation rate after holding at 40 C. for 30 minutes of less than 0.26% by mass. The liquid developer of the present invention is suitably used, for example, in development or the like of latent images formed in electrophotography, electrostatic recording method, electrostatic printing method or the like.

A liquid electrophotographic (LEP) ink can include a liquid ink vehicle, a conductive toner including a conductive pigment and a polymeric binder, and a charge director. The liquid electrophotographic ink can have a conductivity of from 150 to 2000 picoSiemens.

Herein is described an electrostatic ink composition comprising a carrier liquid, aluminium stearate particles, and an aluminium stearate binding agent dissolved in the carrier liquid, wherein the aluminium stearate binding agent comprises an acidic binding group which is bound to an aluminium stearate particle.

A transparent electrophotographic varnish composition comprises a charge adjuvant and inorganic filler particles. A method of manufacturing an electrophotographic varnish composition comprises heating a thermoplastic resin mixture until the resin has melted; cooling the resin mixture to form resin particles; contacting the resin particles with a charge adjuvant and inorganic filler particles to form composite particles or a mixture of particles; and combining the composite particles or particulate mixture with a carrier fluid to form the electrophotographic varnish composition. A liquid electrophotographic printing system and a print substrate are also provided.

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.

This disclosure relates to a liquid electrophotographic composition comprising a thermoplastic polymer resin, a charge adjuvant, microspheres, and a liquid carrier. Each microsphere comprises a shell of material encapsulating a gas. The microspheres are present in an amount of 5 to 90 weight % of the total weight of solids in the composition.

Described herein is a LEP ink composition comprising a luminescent component, a resin; and a carrier liquid security liquid electrostatic ink composition for printing a security image.

An electrophotographic printer and a printing method are provided that may achieve an improved image quality, while reducing the risk of a print target medium being deformed. The electrophotographic printer includes a first color printing means. The first color printing means includes a toner developing unit, a toner image transfer unit, and an ultraviolet irradiating-drying unit. The toner developing unit adsorbs a liquid toner containing an ultraviolet absorbent for absorption of ultraviolet light to a latent charge image so as to develop a toner image. The toner image transfer unit transfers the toner image onto a print target medium. The ultraviolet irradiating-drying unit dries the transferred toner image on the print target medium by ultraviolet irradiation to obtain a dried toner image.