Hp Indigo B.v.

Hewlett-packard Indigo B.v.

Hewlett-packard Development Company, L.p.

Julia Kornilov

Albert Teishev

Ilanit Mor

Yaron Grinwald

Haim Yosef Cohen

Tony Azzam

Yaacov Almog

Gideon Amir

Reut Avigdor

Nurit Carmel-Barnea

Guy Nesher

Shahar Stein

Eyal Bachar

Elliad Silcoff

Emad Masoud

Getahun Biadglin

Samer Farran

Yael Kowal-Blau

Hanit Marom Tchaicheeyan

Mirit Shitrit

Adi Inbar

Herein is disclosed a method of printing comprising the steps of applying an ink comprising a thermoplastic resin to a print substrate using an electrostatic printing process; and applying an overcoat composition comprising a crosslinking agent to the ink after applying the ink to the print substrate, such that the thermoplastic resin of the ink becomes crosslinked on the print substrate due to interaction with the crosslinking agent.

Electrostatic printing

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.

Security liquid electrostatic ink composition

Described herein is a security LEP ink composition comprising an absorber, a resin; and a carrier liquid for printing a security image.

Herein is disclosed a liquid electrophotographic varnish composition comprising: a polymer resin; an epoxy-based cross-linking agent; a metal catalyst and/or a photo-initiator for catalyzing the cross-linking; and a carrier liquid.

Liquid electrophotographic varnish composition

Herein is described a method for the manufacture of a charge director comprising a barium salt. The method comprises reacting barium alkoxide with an acid in a reaction medium comprising ethanol, and separating ethanol from the reaction mixture to recover the barium salt produced.

Manufacture of a charge director

Herein is disclosed a method of printing comprising the steps of:

The present disclosure relates to a method for coating conductive metallic pigment particles, the method comprising: providing a first liquid carrier containing a dissolved resin and suspended conductive metallic pigment particles; effecting precipitation of the resin from the first liquid, such that a coating of the resin is formed on the conductive metallic pigment particles. Also disclosed herein are conductive metallic pigment particles, and an electrostatic ink composition comprising coated conductive metallic pigment particles.

Metallic pigment particles and electrostatic inks

Methods of Printing and Electrostatic Ink Compositions Herein are disclosed electrostatic ink compositions, methods of printing and printed substrates. In some examples, the electrostatic ink composition comprises a carrier liquid, particles comprising a graft co-polymer comprising an acrylate polymer backbone onto which has been grafted polysiloxane side chains, wherein the particles are dispersed in the carrier liquid.

Methods of printing and electrostatic ink compositions

The present disclosure is drawn to compositions and methods for a liquid electrophotographic ink printing. The composition comprises a liquid vehicle; ink particles; and a charge director system, comprising i) a primary charge component, ii) a secondary charge component, and iii) an electrical stability additive; such that the charge director system provides the following ink conductivities: a high field conductivity of about 100 pS/cm to about 500 pS/cm, a low field conductivity of about 20 pS/cm to about 200 pS/cm, a direct charge conductivity less than about 30 pS/cm, and a particle conductivity of at least 100 pS/cm. Additionally, the liquid electrophotographic ink can be formulated for printing from a liquid electrophotographic printer.

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Nes Ziona, Israel

Julia Kornilov