Patent ID: 6632531
Filing Date: 2003-10-14
Classification: C08F,C08J,Y10T

Abstract:
A method of preparing an aqueous dispersion of a plurality of porous particles, wherein said porous particles comprise at least one polymeric phase and a pore filling phase, comprising the steps of:a) forming a reaction mixture in a closed pressure vessel, said reaction mixture comprising: i) at least one monomer; ii) water; iii) a dispersing agent; and iv) at least one fugitive substance; b) forming a plurality of droplets comprising said monomer and said fugitive substance as a dispersed phase in water; c) polymerizing said monomer to form said polymeric phase; d) causing said polymeric phase and said pore filling phase to phase separate from one another, forming said porous particles; and e) reducing the pressure in said pressure vessel to atmospheric pressure; and wherein said pore filling phase comprises said fugitive substance.