Porous bodies and method of production thereof

摘要

Check later The disclosure relates to a method for preparing water dispersible or water soluble porous bodies and the bodies themselves. These porous bodies have an intrusion volume as measured by mercury porosimetry of at least about 3 ml/g and comprise a three dimensional open-cell lattice containing less than 10% by weight of a water soluble polymeric material and 5 to 90% by weight of a surfactant, and a hydrophobic material incorporated into the lattice to be dispersed when the surfactant dissolves, with the proviso that said porous bodies are not spherical beads having an average bead diameter of 0.2 to 5mm.; The method comprises the steps of: (a) providing an intimate mixture of the polymeric material and the surfactant in a liquid medium (b) providing a fluid freezing medium at a temperature effective for rapidly freezing the liquid medium; (c) 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 (d) freeze-drying the frozen liquid medium to form the porous bodies by removal of the liquid medium by sublimation.