Patent ID: 8779029

Claim:
A method of preparing a dispersion of polymer encapsulated solid particulate material in a hydrophilic liquid, said method comprising: (a) providing a dispersion of solid particulate material in a continuous hydrophilic liquid phase, the dispersion having been prepared from a composition comprising the solid particulate material, a hydrophilic RAFT agent and the continuous hydrophilic liquid phase, wherein the hydrophilic RAFT agent (i) functions as a stabilizer for the solid particular material, and (ii) is not capable of forming micelles within the continuous hydrophilic liquid phase, (b) thereafter adding to the dispersion one or more ethylenically unsaturated monomers; and (c) polymerising said one or more ethylenically unsaturated monomers under the control of said hydrophilic RAFT agent to form polymer at the surface of said solid particulate material, thereby providing said dispersion of polymer encapsulated solid particulate material in a hydrophilic liquid.