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: A method for manufacturing microcapsules containing an active substance, the method including: providing an aqueous solution of a surfactant, an oily phase comprising the active substance and a first monomer, and a polar phase comprising a second monomer; preparing an oil-in-water emulsion by adding the oily phase to the aqueous solution of the surfactant; adding the polar phase to the oil-in-water emulsion, in order to obtain a polymer in a reaction mixture, by polymerization of the first monomer and the second monomer; isolating the microcapsules, including a wall formed by the polymer and containing the active substance, from the reaction mixture; wherein the polymer is a poly(beta-amino ester). Microcapsules obtained by the method.

Abstract: Method for manufacturing microcapsules enclosing a substance referred to as the active substance, in which method: there are provided an aqueous solution of a surfactant, an oily phase comprising the active substance and at least a first monomer X, and a polar phase having at least a second monomer Y; an O/W emulsion is prepared by adding the oily phase to the aqueous solution of the surfactant; the polar phase is added to the O/W emulsion in order to obtain a polymer by polymerisation of the X and Y monomers; starting from this reaction mixture, the microcapsules are isolated and comprise a wall which is formed by the polymer and which encloses the active substance; the polymer is a poly(beta-amino ester).

Abstract: Method for manufacturing microcapsules enclosing a substance referred to as the active substance, in which method: there are provided an aqueous solution of a surfactant, an oily phase comprising the active substance and at least a first monomer X, and a polar phase having at least a second monomer Y; an O/W emulsion is prepared by adding the oily phase to the aqueous solution of the surfactant; the polar phase is added to the O/W emulsion in order to obtain a polymer by polymerisation of the X and Y monomers; starting from this reaction mixture, the microcapsules are isolated and comprise a wall which is formed by the polymer and which encloses the active substance; the polymer is a poly(beta-amino ester).

Abstract: The invention pertains to an improved PVDC composition including certain dienophiles qualified for food contact, which possess an optimized balance of effectiveness in preventing discoloration upon exposure to radiation, with no negative impact on the barrier properties, in particular sorbate esters of formula (I), wherein R1 is a C1-C12 hydrocarbon group, preferably a C1-C6 alkyl group, to layers made therefrom, to multi-layer assemblies comprising the same, and to the use of said assemblies for packaging, in particular for packaging foodstuffs.

Abstract: A method for manufacturing microcapsules containing an active substance, the method including: providing an aqueous solution of a surfactant, an oily phase comprising the active substance and a first monomer, and a polar phase comprising a second monomer; preparing an oil-in-water emulsion by adding the oily phase to the aqueous solution of the surfactant; adding the polar phase to the oil-in-water emulsion, in order to obtain a polymer in a reaction mixture, by polymerization of the first monomer and the second monomer; isolating the microcapsules, including a wall formed by the polymer and containing the active substance, from the reaction mixture; wherein the polymer is a poly(beta-amino ester). Microcapsules obtained by the method.

Abstract: A solid organic material comprising at least one amphiphilic block copolymer of the methacrylic type, the block copolymer being dispersed in a polymer matrix, the block copolymer having a number-average molar mass (Mn) greater than or equal to 20 000 g/mol; a method for preparing said solid organic material; use of said solid organic material for antibacterial, antimicrobial, antiviral, anti-inflammatory and/or antifungal applications; a medical device comprising said solid organic material.

Abstract: The invention pertains to an improved PVDC composition including certain dienophiles qualified for food contact, which possess an optimized balance of effectiveness in preventing discoloration upon exposure to radiation, with no negative impact on the barrier properties, in particular sorbate esters of formula (I), wherein R1 is a C1-C12 hydrocarbon group, preferably a C1-C6 alkyl group, to layers made therefrom, to multi-layer assemblies comprising the same, and to the use of said assemblies for packaging, in particular for packaging foodstuffs.

Abstract: The invention pertains to an improved PVDC composition including certain cinnamate dienophiles qualified for food contact, which possess an optimized balance of effectiveness in preventing discoloration upon exposure to radiation, with no negative impact on the barrier properties, in particular cinnamates of formula (I), wherein: —each of R1, R2, R3, equal to or different from each other, is H or a C1-C12 hydrocarbon group, to layers made therefrom, to multi-layer assemblies comprising the same, and to the use of said assemblies for packaging, in particular for packaging foodstuffs.

Abstract: The present invention relates to a novel process for preparing alkoxyamines from a nitroxide and a dithiocarbamate by photolysis reaction. This process, which does not generate effluent containing metals, may be carried out in batch or in continuous mode and takes place at a lower temperature than the known processes for synthesizing alkoxyamines.

Abstract: The invention relates to a method for the polymerization of one or more methacrylate and/or methacrylic monomers, for the synthesis of methacrylate or methacrylic polymers or of exclusively methacrylic and/or methacrylate copolymers, comprising a step of bringing said monomer(s) into contact with one at least of the compounds of formula (I) and (II) below: in which: R1 and R2 may represent a phenyl group, R3 and R4 may together form an ?N-phenyl group, Z represents a group of formula —CR8R9R10, in which R8 and R9 may represent methyl groups and R10 may represent a —COO-phenyl group.

Abstract: The present invention relates to a process for the preparation of the alkoxyamine 2-methyl-2-[N-(diethoxy-phosphoryl-2,2-dimethylpropyl)aminoxy]propionic acid or of its salts comprising a stage of saponification of an azo compound in the presence of a base, a stage of photolysis of the salt resulting from the saponification stage in the presence of N-(tert-butyl)-1-diethylphosphono-2,2-dimethylpropyl nitroxide and optionally a stage of acidification of the salt of the alkoxyamine obtained on conclusion of the photolysis stage. The alkoxyamine or its salts can be used as radical polymerization initiators.