Ink jet inks containing colored silica particles
AssigneeXerox Corporation
InventorsFrancoise M. Winnik, Barkev Keoshkerian
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Abstract
An ink jet ink composition which comprises water, a solvent, and a plurality of colored particles comprising hydrophilic porous silica particles, to the surfaces of which dyes are covalently bonded through silane coupling agents. The particles are prepared by a process which copmrises reacting hydrophilic porous silica particles with a silane coupling agent in the absence of water to form particles having covalently attached thereto coupling agents, followed by reacting a dye with the coupling agent attached to the silica particles.
Claims47
An ink jet ink composition which comprises water;
- a solvent selected from the group consisting of glycols, dimethylsulfoxide, and sulfolane;
- and a plurality of colored particles comprising hydrophilic porous silica particles, to the surface of which dyes are covalently bonded through silane coupling agents.
An ink composition which comprises water;
- a solvent selected from the group consisting of glycols, dimethylsulfoxide, and sulfolane;
- and a plurality of colored particles comprising hydrophilic porous silica particles, to the surface of which dyes are covalently bonded through silane coupling agents;
- wherein the particles are prepared by a process which comprises reacting hydrophilic porous silica particles with a silane coupling agent in the absence of water to form particles having covalently attached thereto coupling agents, followed by reacting a dye with the coupling agent.
A process for preparing an ink jet ink composition which comprises reacting hydrophilic porous silica particles with a silane coupling agent in the absence of water to form silica particles having covalently attached thereto coupling agents, subsequently reacting a dye with the coupling agent to form colored silica particles to the surface of which the dye is covalently bonded through the silane coupling agent, dispersing the colored silica particles in water, and adding to the dispersion a solvent selected from the group consisting of glycols, dimethyl sulfoxide, and sulfolane.
An ink jet ink composition which comprises water, a solvent, and a plurality of colored particles comprising hydrophilic porous silica particles, to the surface of which dyes are covalently bonded through silane coupling agents.
Dependencies are inferred from the claim text.