Hp Indigo B.v.

Hewlett-packard Indigo B.v.

Hewlett-packard Development Company, L.p.

Marc Klein

Albert Teishev

Eyal Bachar

Adi Mann

Eyal Handel

Mark Sandler

Yaron Grinwald

Peter Nedelin

Gil Bar-Haim

Giries Kadis

Benjamin Dayan

Stella Stolin Roditi

Vladislav Kaploun

Marko Richter

Swissa Shay

Tal Rosenthal

Ezra Cohen

Ilanit Mor

Haim Yosef Cohen

Nava Klein

Fernanda Orlik

Getahun Biadglin

Hanit Marom Tchaicheeyan

Olga Kagan

Noam Parvin

Eyal Bodinger

Roi Liraz

Neta Filip-Granit

Nir Mosenson

Ofir Bros

Jin Li Guang

In an example, a method includes identifying a contact area of a substrate within which an apparatus will make contact with the substrate and defining a boundary area of the substrate between the contact area and a remaining area of the substrate. Print agent may be printed on the substrate, wherein the print agent is printed at a first coverage in the remaining area, a second coverage less than the first coverage in the contact area; and a gradually reducing coverage across the boundary area from the first to the second coverage.

Reducing marks in print agents on substrates

An example apparatus includes a conveyor. The apparatus also includes a first developer unit. The first developer unit is to concentrate first printing liquid. The first developer unit also is to deliver the first printing liquid to the conveyor. The apparatus also includes a second developer unit. The second developer unit is to concentrate second printing liquid. The second developer also is to deliver the second printing liquid to the conveyor to form a thick layer of printing liquid comprising the first and second printing liquid.

Printing liquids concentration

In an example, a method includes providing a print agent with chargeable particles in a carrier fluid to a print agent concentration apparatus. The print agent may be passed between a conveyor and an electrode, and a potential applied to cause the chargeable particles to be attracted to the conveyor and to form a concentrated layer of particles on the conveyor. An indicator of particle concentration in the concentrated layer may be measured. It may be determined if the indicator of particle concentration meets predetermined criteria.

Layer thickness in print agent concentration apparatus

In an example, a method includes providing a print agent comprising chargeable particles in a carrier fluid to a print agent concentration apparatus (). The print agent may be passed between a conveyor () and an electrode (), and a potential applied to cause the chargeable particles to be attracted to the conveyor and to form a concentrated layer of particles on the conveyor. A proportion of the carrier fluid may be separated from the concentrated layer of particles and a thickness of a remaining layer on the conveyor may be measured. It may be determined if the measured thickness of the layer meets predetermined criteria and, if not, an operational parameter of the print agent concentration apparatus may be adjusted.

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 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.

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.

Liquid electrophotographic ink composition

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&#xb0; 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.

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.

The present disclosure discloses a liquid electrophotographic ink. The ink includes a liquid vehicle, an ethylene acid copolymer, and an ethylene/(meth)acrylic acid C1-10 alkyl ester copolymer. Also disclosed is a method for the manufacture that ink and a method for performing a liquid electrophotographic process by printing a substrate with the ink.

Liquid electrophotographic ink

A method of producing an electrostatic ink composition, the method comprising: providing a precursor ink composition comprising a resin and a pigment dispersed in a liquid carrier; wherein the precursor ink composition comprises 30 wt % or more non-volatile solids; and spraying a lubricating liquid onto the surface of the precursor ink composition to form the electrostatic ink composition.

Method of producing an electrostatic ink composition

The present disclosure provides for a liquid electrophotographic (LEP) ink comprising a carrier fluid, a pigment, a high melt viscosity ethylene acrylic acid copolymer resin, and a high acid ethylene acrylic acid copolymer resin. The high acid ethylene acrylic acid copolymer resin can have an acid content of at least 15 wt % and a viscosity of at least 8,000 poise. Additionally, the LEP ink can have a total resin acidity of at least 15 wt % and a total resin melt viscosity of at least 20,000 poise.

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Tel Aviv, Israel

Marc Klein