Polymerization process for making porous polymeric particles
AssigneeRohm and Haas Company
InventorsPaul J. Leifholtz, Thomas E. Meteyer
Life of this patent
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Abstract
A process for making porous polymeric particles having high surface area includes suspending a discontinuous organic phase in an continuous aqueous phase, wherein the organic phase includes an ethylenically unsaturated monomer, a water soluble phase extender and a surfactant in an amount effective to solubilize the water soluble phase extender in the monomer and wherein the aqueous phase includes a diffusion barrier agent for limiting mass transfer of the phase extender from the organic phase to the aqueous phase, and then polymerizing the ethylenically unsaturated monomer to form the porous polymeric particles.
Claims27
A process for making porous polymeric particles, comprising:
- suspending a discontinuous organic phase in a continuous aqueous phase;
- said organic phase comprising:
- an ethylenically unsaturated monomer;
- a water soluble phase extender selected from the group consisting of water, methanol, ethanol, n-propanol, 2-propanol, tert-butanol and acetone;
- and
- a surfactant in an amount effective to solubilize the water soluble phase extender in the monomer;
- and
- said aqueous phase comprising diffusion barrier means dispersed in the aqueous phase, for limiting mass transfer of the phase extender from the organic phase to the aqueous phase;
- and
- polymerizing the ethylenically unsaturated monomer to form the porous polymer particles.
A process for making porous polymeric particles, comprising:
- suspending a discontinuous organic phase in a continuous aqueous phase;
- said organic phase comprising:
- an ethylenically unsaturated monomer;
- a water soluble phase extender;
- and
- a surfactant in an amount effective to solubilize the water soluble phase extender in the monomer;
- and
- said aqueous phase comprising diffusion barrier means dispersed in the aqueous phase, for limiting mass transfer of the phase extender from the organic phase to the aqueous phase;
- and
- polymerizing the ethylenically unsaturated monomer to form the porous polymer particles.
- wherein the water soluble phase extender is water.
Dependencies are inferred from the claim text.