Patent ID: 7579400

Claim:
Particles comprising at least one ionically charged polymer, at least one surfactant having an ionic charge opposite to that of said polymer, at least one block copolymer consisting of one nonionic hydrophilic block A and one ionic block B, the particles optionally comprising at least one active substance, the internal structure of the particles forming a mesophase which is the organized phases of charged polymer/oppositely charged surfactant complexes, and the particles being in suspension in an aqueous phase, wherein the monomers from which the ionic block B are formed, are cationic monomers selected from the group consisting of aminoalkyl (meth)acrylates and aminoalkyl(meth)acrylamides; monomers containing at least one secondary, tertiary or quaternary amine function, or a heterocyclic group containing a nitrogen atom, vinylamine and ethyleneimine; and diallyldialkylammonium salts.