Porous materials and method of production thereof

摘要

Check later Disclosed are water dispersible or water soluble porous bodies comprising a three dimensional oil and water emulsion-templated open-cell lattice containing 10 to 95 % by weight of a polymeric material which is soluble in water, and, less than 5 % by weight of a surfactant, a hydrophobic material incorporated into the lattice to be dispersed when the water soluble polymer dissolves, said porous bodies having an intrusion volume as measured by mercury porosimetry (as hereinafter described) of at least about 3 ml/g, and, with the proviso that said porous bodies are not spherical beads having an average bead diameter of 0.2 to 5mm. And a method for making the same comprising the steps of: providing an intimate mixture of the polymeric material and any surfactant in a liquid medium: providing a fluid freezing medium at a temperature effective for rapidly freezing the liquid medium; cooling the liquid medium with the fluid freezing medium at a temperature below the freezing point of the liquid medium for a period effective to rapidly freeze the liquid medium; and freeze-drying the frozen liquid medium to form the porous bodies by removal of the liquid medium by sublimation.