Patent ID: 7807751

Claim:
A method of forming a core-shell particle, comprising: forming a crosslinked polyorganosiloxane core by copolymerizing a polydialkylsiloxane precursor and a tri- or tetraalkoxysilane in the presence of water and an emulsifying agent; 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 comprising alkenyl aromatic compound in the presence of the graftlinker-functionalized crosslinked polysiloxane core; wherein the water is used in an amount of 45 to 99 weight percent based on the combined weight of the polydialkylsiloxane precursor, the tri-or tetraalkoxysilane, the graftlinking agent, and the shell-forming monomer.