Patent ID: 6359031
Filing Date: 2002-03-19
Classification: B01J,C11D,Y10S,Y10T

Abstract:
A process for making particles having a hydrophilic core within a shell formed by interfacial condensation polymerisation of a substantially oil soluble first IFC reactant having at least two first condensation groups with a substantially water soluble second IFC reactant having at least two second condensation groups, the process comprising forming a water in oil dispersion of an aqueous core composition comprising core material and the second IFC reactant in a water immiscible liquid which contains an oil soluble or oil swellable polymeric stabiliser, blending the dispersion with the first IFC reactant and allowing reaction to occur between the first and second IFC reactants and thereby forming the shell, and in which the polymeric stabiliser is an amphipathic polymeric stabiliser having recurring hydrophobic groups and recurring reactive hydrophilic groups and the reactive hydrophilic groups are associated with the second condensation groups of the second IFC reactant before the blending with the first IFC reactant.