| abstract |
The invention concerns a method for preparing dispersible colloidal systems, in the form of nanocapsules whereof the shell wall consists of a polymer obtained by polycondensation of two monomers alpha and beta and whereof the core consists of a substance B, characterised in that it consists in: (1) preparing a first liquid phase consisting of a monomer alpha solution in a solvent or a mixture of solvents, and containing one or several surfactant(s) and the substance B in solution or in suspension; (2) preparing a second liquid phase consisting of a non-solvent or a mixture of non-solvents of monomer alpha , containing monomer beta and one or several surfactant(s), the solvent or mixture of solvents of the first phase being miscible in all proportions with the non-solvent or mixture of non-solvents of the second phase; (3) adding under moderate stirring, the first phase to the second phase, so as to obtain a colloidal suspension of nanocapsules, the stirring being maintained until complete polymerisation of monomers alpha and beta ; (4) optionally eliminating all or part of the solvent or mixture of solvents and of the non-solvent or mixture of non-solvents so as to obtain a colloidal suspension with the desired concentration in nanocapsules. |