Patent ID: 8153713

Claim:
A method of forming a core-shell particle, comprising: forming a polyorganosiloxane core by polymerizing a polydialkylsiloxane precursor in the presence of water and a first emulsifying agent and in the absence of a tri- or tetraalkoxysilane; crosslinking the polyorganosiloxane core by reacting a tri- or tetraalkoxysilane with the polyorganosiloxane core; forming a graftlinker-functionalized crosslinked polyorganosiloxane core by reacting the crosslinked polyorganosiloxane core with a graftlinking agent comprising an alkoxysilane group and an aliphatic carbon-carbon double or triple bond; and forming a core-shell particle by polymerizing a shell-forming monomer in the presence of the graftlinker functionalized crosslinked polysiloxane core and a second emulsifying agent different from the first emulsifying agent; wherein the shell-forming monomer comprises an alkenyl aromatic compound; wherein the core-shell particle has a mean diameter of 220 to 300 nanometers.