Patent ID: 8241828
Filing Date: 2012-08-14
Classification: G03G

Abstract:
1. A method of manufacturing porous polymer particles comprising: forming a dispersion of washed porous polymer particles in an external aqueous phase, wherein individual porous particles each comprise a continuous polymer phase and internal pores containing an internal aqueous phase comprising a pore stabilizing hydrocolloid, the external aqueous phase of the dispersion of porous polymer particles has a specific conductivity of less than 100 microSeimens/cm and the ionic strength in the external aqueous phase is lower than the ionic strength in the internal aqueous phase, and the porous polymer particles have a porosity of greater than 10% based on volume of the internal pores as a percentage of the total volume of the particles; and filtering the dispersion of washed porous polymer particles with a filter to remove the external aqueous phase and isolate the porous polymer particles, wherein the filtering is done while agitating the porous particles.