Hewlett-packard Development Company, L.P.

Hp Indigo B.v.

Neta Filip-Granit

Albert Teishev

Yaron Grinwald

Ilanit Mor

Haim Yosef Cohen

Eyal Bachar

Nava Klein

Marc Klein

Emad Masoud

Fernanda Orlik

Stella Stolin Roditi

Vladislav Kaploun

Olga Kagan

Eyal Bodinger

Roi Liraz

Swissa Shay

Yelena Litichevski

Provided in one example herein is a liquid electrophotographic ink composition. The composition comprises: a carrier fluid comprising a polymer; ink particles each comprising a non-aqueous polymeric resin and pigment particles distributed in the polymeric resin; and a charge director. The pigment particles comprise a metal oxide and have a hydrophobic surface. The hydrophobic surface comprises at least one of the following: (i) nanoparticles attached to each of the pigment particles, the nanoparticles comprising at least one of an oxide, a phosphate, and a nitrate; (ii) a coating disposed over each of the pigment particles, the coating comprising at least one of an oxide, a phosphate, and a nitrate; and (iii) a coating disposed over each of the pigment particles, the coating comprising at least one of a polymer and an oligomer.

Ink composition with pigment particles having a hydrophobic surface

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.

Liquid electrophotographic inks

Growing community of inventors

Moshav azrikam, Israel

Neta Filip-Granit