Patent ID: 8703834

Claim:
A method for preparing a crosslinked organic porous particle comprising: providing a first water-in-oil emulsion comprising a first pore stabilizing hydrocolloid in a first aqueous phase that is dispersed in a first oil phase, which first oil phase comprises a first polyfunctional reactive compound, a first reagent that causes crosslinking, optionally at least one first ethylenically unsaturated polymerizable monomer, and optionally a first organic solvent, providing a second water-in-oil emulsion comprising a second pore stabilizing hydrocolloid in a second aqueous phase that is dispersed in a second oil phase, which second oil phase comprises a second polyfunctional reactive compound, a second reagent that causes crosslinking, optionally at least one ethylenically unsaturated polymerizable monomer, and optionally a second organic solvent, combining the first and second water-in-oil emulsions to form a third water-in-oil emulsion containing a mixture of the first and second oil phases and distinct droplets of the first and second aqueous phases, dispersing the third water-in-oil emulsion in a third aqueous phase containing a surface stabilizing agent to form a water-in-oil-in-water emulsion containing droplets of the third water-in-oil emulsion, which third water-in-oil emulsion droplets contain the distinct droplets of the first and second aqueous phases, and polymerizing the polyfunctional reactive compounds and optionally the ethylenically unsaturated polymerizable monomers to form a precursor crosslinked organic porous particle having a crosslinked organic solid phase including an external particle surface, and first and second discrete pores, being isolated from each other and dispersed within the crosslinked organic solid phase, removing, if present, the first and second organic solvents to produce an aqueous suspension of the precursor crosslinked organic porous particle, and isolating the precursor crosslinked organic porous particle to provide a crosslinked organic porous particle.