Abstract: Use of biodegradable microcapsules comprising a wall made of poly(beta-amino)ester, abbreviated to PBAE, which contains an active substance. These microcapsules may be obtained by a method of interfacial polymerization between an amine monomer and a multi-acrylate monomer. Depending on the intended use, microcapsules with a wall that is weak, breakable or unbreakable and porous or non-porous are used; these properties may be obtained by the choice of the monomers and the thickness of the wall. For certain uses, it is possible to use the polymerization reaction mixture directly, without washing.

Abstract: Method for manufacturing microcapsules comprising a wall made of polymer material containing an active substance, comprising the following steps: —preparing an oil phase comprising a poly(beta-aminoester) prepolymer, and an active substance constituting the phase to be encapsulated; preparing an aqueous phase comprising at least one surfactant; preparing an O/W (oil in water) emulsion by adding the oil phase to the aqueous phase; and initiating radical polymerisation with in the emulsion. A polymerisation initiator must be present in the aqueous and/or oil phase.

Abstract: The present invention describes the use of copolymers with a composition gradient as sole stabilizer in emulsion free-radical polymerization. The copolymers of the invention are prepared via controlled free-radical polymerization and comprise at least one hydrophilic monomer such as acrylic acid and at least one hydrophobic monomer such as styrene.

Abstract: The present invention describes the use of copolymers with a composition gradient as sole stabilizer in emulsion free-radical polymerization. The copolymers of the invention are prepared via controlled free-radical polymerization and comprise at least one hydrophilic monomer such as acrylic acid and at least one hydrophobic monomer such as styrene.