Colored silica particles

A toner composition comprising a resin and silica particles containing a water soluble dye entrapped therein, said silica particles being coated with a surfactant.

A liquid developer composition comprising an organic liquid vehicle, a polymer soluble in the organic liquid vehicle, a charge control agent, and silica particles containing a water soluble dye entrapped therein, said silica particles being coated with a surfactant, wherein said silica particles are dispersed within the organic liquid vehicle.

A liquid developer composition comprising an organic liquid vehicle, a charge control agent, and toner particles comprising a resin insoluble in the organic liquid vehicle at room temperature and silica particles containing a water soluble dye entrapped therein, said silica particles being coated with a surfactant, wherein said toner particles are dispersed within the organic liquid vehicle.

A process for preparing particles which comprises preparing a mixture of a surfactant and an organic solvent immiscible with water and capable of forming a stable microemulsion with water, adding to the mixture a solution of a water-soluble dye, a hydrolyzing reagent, and water to form a microemulsion of water domains within a continuous phase of the organic solvent, and adding to the microemulsion a tetraalkoxysilane, wherein the tetraalkoxysilane reacts with the hydrolyzing agent to form in each water domain a silica particle containing the water-soluble dye and coated with the surfactant.

A process for preparing particles which comprises preparing a mixture of a surfactant and an organic solvent immiscible with water and capable of forming a stable microemulsion with water, adding to the mixture a solution of a hydrolyzing reagent and water to form a microemulsion of water domains within a continuous phase of the organic solvent, adding to the microemulsion a water-soluble dye to form a colored microemulsion, and adding to the colored microemulsion a tetraalkoxysilane, wherein the tetraalkoxysilane reacts with the hydrolyzing agent to form in each water domain a silica particle containing the water-soluble dye and coated with the surfactant.

A process for forming images which comprises (1) forming an electrostatic latent image on an imaging member;

• (2) developing the latent image with a toner comprising a resin and colorant particles which comprise silica particles containing a water soluble dye entrapped therein, said silica particles being coated with a surfactant;
• and (3) transferring the developed image to a substrate.

A hot melt ink jet ink which comprises a binder, a propellant, and colorant particles which comprise silica particles containing a water soluble dye entrapped therein, said silica particles being coated with a surfactant.