Hp Indigo B.v.

Hewlett-packard Development Company, L.p.

Hewlett-packard Indigo B.v.

Gil Bar-Haim

Albert Teishev

Yaron Grinwald

Alina Grishman

Ilanit Mor

Danny Feldman

Dror Kella

Shmuel Borenstain

Reut Avigdor

Gregory Katz

Eyal Bachar

Elliad Silcoff

Marc Klein

Emad Masoud

Adi Vinegrad

Anatoly Sobolevsky

Tal Rosenthal

Zhang-Lin Zhou

Alexey S Kabalnov

Mark Sandler

Ziv Gilan

Qin Liu

Gideon Amir

Michel Assenheimer

Barry J Oldfield

Jong-Souk Yeo

Eyal Shelef

Getahun Biadglin

Regina Guslitzer

Giries Kadis

Vladislav Kaploun

Amir Ofir

Noam Parvin

Tehila Ben-Ezra

Shiran Zabar

Eyal Bodinger

Mirta Perlman

Roi Liraz

Yigal Berson

Biana Noikas

Yelena Litichevski

Igal Berson

Gili Assaf

Keren Goldshtein

Haim Gefen

Rita Reznikov

Avishai Moshel

David Savelzon

Iianit Mor

Rita Feldman

Jeanne Qin Liu

Jin Li Guang

Systems, apparatuses, and methods of fluid delivery for liquid electrophotography printing. A fluid delivery apparatus includes a charged ink source, a supplemental fluid source, a working suspension tank in fluid communication with the charged ink source and the supplemental fluid source, a sensor, and an optical density control unit. The charged ink source is to store a charged ink mixture including charge directors and toner particles. The supplemental fluid source is to store a supplemental fluid including imaging oil. The working suspension tank is to store a working suspension mixture including the charge directors, the toner particles, and the imaging oil. The sensor is to monitor an optical density of print output of the liquid electrophotography printing apparatus. The optical density control unit is to determine whether to supply an uncharged ink mixture to the working suspension tank in response to the monitored optical density indicating electrical fatigue.

Uncharged ink supply for electrical fatigue in liquid electrophotography printing

A method of calibrating a developer unit of a liquid electrophotographic printer, the method comprising: setting a developer roller voltage and iteratively printing a patch on a print medium using different electrode voltages until a hue of a patch printed using one of the electrode voltages is within a tolerance of a target hue; and setting an electrode voltage based on said one of the electrode voltages and iteratively printing a patch on a print medium using different developer roller voltages until a hue of a patch printed using one of the developer roller voltages is within the tolerance of the target hue.

Hue based color calibration

In one aspect, the present disclosure relates to a liquid electrophotographic electrode ink composition comprising: a thermoplastic polymer comprising a copolymer of an olefin and acrylic acid and/or methacrylic acid; an electroactive material comprising a lithium intercalation material; a charge adjuvant, and a liquid carrier.

Electrophotographic ink composition including copolymer of olefin and (meth) acrylic acid and charge adjuvant

In an example of a printing system, the amount of a printing fluid that is transferred from a developer unit onto an imaging plate is varied in order to alter the optical density of an area covered by the printing fluid.

Printing by printing fluid transfer

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.

Liquid electrophotographic ink composition

Herein is disclosed magenta liquid electrostatic ink compositions. In some examples, the electrostatic ink compositions comprise a magenta pigment, a basic dispersant, a resin comprising a polymer having acidic side groups, a carrier liquid and a charge director, wherein the dispersant comprises a compound comprising a succinimide group linked to a primary, secondary or tertiary amine.

Electrostatic ink compositions

Herein is disclosed an electrostatic ink composition, wherein the composition is formable by combining: chargeable particles comprising a resin comprising a polymer having acidic side groups, and a cyclic anhydride. Also disclosed herein is a method of forming an electrostatic ink composition, and a method of electrostatic printing.

Herein is disclosed a cyan electrostatic ink composition, the cyan electrostatic ink composition comprising: a cyan pigment, a basic dispersant, a phthalocyanine having acid groups, a resin and a charge director.

Herein is disclosed an electrostatic ink composition. In some examples, the electrostatic ink compositions comprise: a carrier liquid; a first resin; and a fluorescent pigment. The fluorescent pigment comprising a fluorescent dye and a second resin matrix, wherein the second resin is selected from the group comprising polyamide resins, polyvinylchlorides, polyolefin resins, polystyrenes, acrylonitrile-butadiene-styrene resins, polycarbonates, poly acrylic and methacrylic acid resins, polyethylene terephthalates, polyamide resins, polyurethanes, epoxy resins, silicone resins, polyester resins, alkyd resins, acrylonitrile polymers, polyesteramides or combinations thereof.

Herein is disclosed an electrostatic ink composition, wherein the composition is formable by combining: chargeable particles comprising a resin, a charge director comprising a sulfosuccinate salt, and a non-polymeric, non-fatty acid having a pK, when measured in water at 20&#xb0; C., of at least 1. Also disclosed herein is a method of forming an electrostatic ink composition, and a method of electrostatic printing.

Herein is disclosed a magenta liquid electrostatic ink composition comprising chargeable particles comprising a resin, a pigment, a liquid carrier in which the chargeable particles are dispersed, and a charge director, wherein the resin is formable from polymerizing alkylene monomers and methacrylic or acrylic acid monomers, the pigment is selected from pigment violet 19 type &#x3b1;pigment violet 19 type &#x3b1;pigment violet 19 type &#x3b2;, pigment violet 19 type &#x3b3;, pigment red 177, pigment red 208, pigment red 122 and pigment violet 32, and the liquid electrostatic ink composition lacks any other types of pigment. Also disclosed herein is a method of electrostatic printing and a print substrate having printed thereon the magenta liquid electrostatic ink composition.

Herein is disclosed a magenta liquid electrostatic ink composition comprising a carrier liquid; and ink particles comprising a resin, a magenta pigment and a black pigment, wherein the black pigment is present in the composition in an amount of 0.01 to 0.5 wt % by total solids of the composition.

The present disclosure is drawn to an electrostatic ink composition comprising a resin and an elongate conductive species. Also disclosed herein is a substrate on which is electrostatically printed a conductive trace, wherein the trace comprises a resin and an elongate conductive species. Further disclosed herein is a method of electrophotographic printing an electrostatic ink composition comprising a resin and an elongate conductive species.

Described herein is a method for electrostatic printing including: (i) providing an ink composition having: a hydrocarbon carrier liquid and particles includes a resin and a colorant, and wherein the ink composition contains less than 0.3 mg of charge director per g of solids in the ink composition; (ii) adding a charge director to the ink composition, such that the total amount of charge director in the ink composition is at least 0.6 mg per g of solids in the ink composition, and, (iii) within a predetermined time of adding the charge director, printing the ink onto a print medium in an electrostatic printing process, wherein the predetermined time is 90 minutes or less.

Electrostatic printing

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Holon, Israel

Gil Bar-Haim