Patent ID: 7915327
Filing Date: 2011-03-29
Classification: C08J,G03G,Y10T

Abstract:
1. 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.