Phase Change Magnetic Ink Comprising Inorganic Oxide Coated Magnetic Nanoparticles And Process For Preparing Same

A process for preparing a phase change magnetic ink comprising:

• combining a phase change ink carrier, an optional colorant, an optional dispersant, an optional synergist, an optional antioxidant, and an inorganic oxide coated magnetic nanoparticle comprising a magnetic core and an inorganic oxide shell disposed thereover;
• heating to provide a phase change magnetic ink including the metal nanoparticles;
• optionally, filtering the phase change magnetic ink while in a liquid state, and
• cooling the phase change magnetic ink to a solid state.

A process which comprises:

• (1) incorporating into an ink jet printing apparatus a phase change magnetic ink comprising a phase change ink carrier, an optional colorant, an optional dispersant, an optional synergist, an optional antioxidant;
• and an inorganic oxide coated magnetic nanoparticle comprising a magnetic core and an inorganic oxide shell disposed thereover;
• (2) melting the ink;
• and
• (3) causing droplets of the melted ink to be ejected in an imagewise pattern onto a substrate.