Patent ID: 7390844
Filing Date: 2008-06-24
Classification: C08F

Abstract:
1. A heterogeneous method for forming polymer particles comprising providing a water immiscible organic phase, comprising at least one monomer and a porogen, dispersed in a continuous water phase, polymerizing said organic phase to obtain dispersed polymers particles, and adding hydrophobically capped oligomeric acrylamide to the dispersed polymer particles to yield polymer particles stabilized with hydrophobically capped oligomeric acrylamide, wherein the polymeric particles range in median diameter from 0.01 to 10 μm and comprise either polyester or addition polymers of monomers containing α, β-ethylenic unsaturation, which addition polymers are styrenic, acrylic, or a polyester-addition polymer hybrid, wherein the polymer particles are porous and crosslinked by incorporation of a monomer or monomers which are polyfunctional with regard to free radical polymerization, wherein said polymer particles have a porosity of at least 100 m 2 /g.