Process of encapsulation by interfacial polycondensation

Claim 1

In a process for the encapsulation of a liquid hydrophobic substance by interfacial polycondensation comprising in a first stage, dispersing, in an aqueous phase, an organic phase consisting essentially of the liquid hydrophobic substance to be encapsulated and at least one hydrophobic reagent having two or three functional groups selected from the groups consisting of carboxylic acid chloride, sulfonyl acid chloride, isocyanate and mixtures thereof; and then, in a second stage, causing the polycondensation of the hydrophobic reagent with at least one di- or tri-functional amine as a hydrophilic reagent, said liquid hydrophobic substance being inert to said hydrophobic reagent and the polycondensation product thereof: the improvement wherein, prior to said hydrophobic reagent being brought into contact with said di- or tri-functional amine, said di- or tri-functional amine in the aqueous phase has its amine functions rendered unreactive by salification with hydrohalic acid and, in the second stage, the polycondensation is started by liberating the amine functions through the addition, to the aqueous phase, of an equivalent amount of an inorganic base which is stronger than the amine.