Spherical silica core-shell particles
AssigneeXerox Corporation
InventorsBarkev Keoshkerian, Naveen Chopra, Paul J. Gerroir
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Abstract
A process of preparing spherical nano-sized core/shell silica particles, including providing a latex polymer dispersion comprising particles of a liquid dispersible starting polymer in a dispersion liquid, adding at least one functionalized monomer to the latex polymer dispersion and polymerizing the at least one functionalized monomer on the particles, and growing an outer silicate shell on the particles through addition and reaction of at least one silane monomer.
Claims14
A process of preparing spherical nano-sized core/shell silica particles, comprising
- providing a latex polymer dispersion comprising liquid dispersible starting polymer particles in a dispersion liquid;
- adding at least one functionalized monomer on the latex polymer dispersion and polymerizing the at least one functionalized monomer on the liquid dispersible starting polymer particles to form a particle having a first shell derived from the at least one functionalized monomer;
- and
- growing an outer silicate shell on the particle having a first shell through addition and reaction of at least one silane monomer to form a particle having an outer most shell derived from the at least one silane monomer,
- wherein the nano-sized core/shell silica particles have an organic core formed of the liquid dispersible starting polymer,
- wherein the liquid dispersible starting polymer is a sulfonated polyester resin,
- wherein the nano-sized core/shell silica particle size is from about 5 nm to about 100 μm, and
- wherein the at least one silane monomer is added in an amount of 10 weight percent to 150 weight percent relative to a size of the particle having a first shell.
A process of preparing spherical nano-sized core/shell silica particles, comprising
- providing a latex polymer dispersion comprising liquid dispersible starting polymer particles in a dispersion liquid;
- adding at least one functionalized monomer on the latex polymer dispersion and polymerizing the at least one functionalized monomer on the liquid dispersible starting polymer particles to form a particle having a first shell derived from the at least one functionalized monomer;
- wherein the at least one functionalized monomer is an acrylate or methacrylate functionalized alkoxysilane;
- and
- growing an outer silicate shell on the particle having a first shell through addition and reaction of at least one silane monomer to form a nano-sized core/shell silica particles having an outer most shell derived from the at least one silane monomer,
- wherein the nano-sized core/shell silica particles have an organic core formed of the liquid dispersible starting polymer,
- wherein the liquid dispersible starting polymer is a sulfonated polyester resin,
- wherein the core/shell silica particle size is from about 5 nm to about 100 μm,
- wherein the acrylate or methacrylate functionalized trimethoxysilane, and
- the at least one silane monomer is added in an amount of 10 weight percent to 150 weight percent relative to a size of the particle having a first shell.
Dependencies are inferred from the claim text.