Abstract: A copolymer having amphiphilic blocks includes at least one first hydrophilic block, obtainable from n-butyl acrylate and hydroxyethyl methacrylate monomers, and a second hydrophobic block likely to be obtained from a methyl methacrylate monomer. The copolymer is found to be particularly advantageous for use as an additive for manufacturing a polymer filtration membrane, particularly a PVDF membrane, particularly via a phase inversion method.

Abstract: The invention relates to polymer particles in the form of filaments formed by block copolymers, as well as to the method for preparing same by means of controlled radical polymerization in emulsion in the presence of a specific living macroinitiator derived from a nitroxide. The invention is characterized in that the filamentous particles are obtained in a dispersed aqueous medium by means of the synthesis of said block copolymers, performed by heating the reaction medium at a temperature of 60 to 120° C., the final block copolymer containing between 10 and 50 mol. % of the macroinitiator which is water soluble and the hydrophobic monomer conversion rate being at least 50%. According to the invention, the weight ratio of hydrophilic fraction of the filamentous particles is less than 25 wt %.

Abstract: The invention relates to a surface preparation method using a combination of at least two polymers, which are the same or different, which are grafted hierarchically or multiply on a surface, and also to the use of this preparation method, more particularly in applications for controlling the surface energy of a substrate. The invention may allow a block polymer to be structured with a minimum of defects.

Abstract: The invention relates to the use of polymer particles in the form of filaments formed by block copolymers, as viscosifiers or agents that modify the rheology of organic or aqueous solutions. More specifically, the invention relates to the use of said crosslinked filamentous polymer particles for improving the resistance to heat ageing of an organic or aqueous solution.

Abstract: A copolymer having amphiphilic blocks includes at least one first hydrophilic block, obtainable from n-butyl acrylate and hydroxyethyl methacrylate monomers, and a second hydrophobic block likely to be obtained from a methyl methacrylate monomer. The copolymer is found to be particularly advantageous for use as an additive for manufacturing a polymer filtration membrane, particularly a PVDF membrane, particularly via a phase inversion method.

Abstract: The invention relates to polymer particles in the form of filaments formed by block copolymers, as well as to the use thereof as rheology modifiers for aqueous or organic solutions. A first aspect of the invention relates to filamentous polymer particles having a length/diameter ratio greater than 100, said particles being formed by block copolymers synthesized by controlled radical emulsion polymerization in emulsion, performed using at least one hydrophobic monomer in the presence of a water-soluble marcoinitiator. The invention is characterized in that the filamentous particles are obtained in an aqueous medium for the synthesis of said block copolymers, performed by heating the reaction medium to a temperature of 60 to 120° C., the final block copolymer containing between 10 and 50 mol. % of the water-soluble macroinitiator and the hydrophobic monomer conversion rate being at least 50%.

Abstract: The invention relates to a surface preparation method using a combination of at least two polymers, which are the same or different, which are grafted hierarchically or multiply on a surface, and also to the use of this preparation method, more particularly in applications for controlling the surface energy of a substrate. The invention may allow a block polymer to be structured with a minimum of defects.

Abstract: The present invention relates to a process for the preparation of a lactone or lactam homopolymer, comprising the stage consisting in reacting a lactone or lactam with a nonpolymeric initiator comprising at least one hydroxyl or thiol functional group in a nonchlorinated solvent in the presence of a sulfonic acid of formula R—SO3H. It also relates to the polymer composition thus obtained and to its uses, in particular as antistatic additive.

Abstract: The invention relates to polymer particles in the form of filaments formed by block copolymers, as well as to the use thereof as rheology modifiers for aqueous or organic solutions. A first aspect of the invention relates to filamentous polymer particles having a length/diameter ratio greater than 100, said particles being formed by block copolymers synthesized by controlled radical emulsion polymerization in emulsion, performed using at least one hydrophobic monomer in the presence of a water-soluble marcoinitiator. The invention is characterized in that the filamentous particles are obtained in an aqueous medium for the synthesis of said block copolymers, performed by heating the reaction medium to a temperature of 60 to 120° C., the final block copolymer containing between 10 and 50 mol. % of the water-soluble macroinitiator and the hydrophobic monomer conversion rate being at least 50%.

Abstract: The invention relates to polymer particles in the form of filaments formed by block copolymers, as well as to the method for preparing same by means of controlled radical polymerization in emulsion in the presence of a specific living macroinitiator derived from a nitroxide. The invention is characterized in that the filamentous particles are obtained in a dispersed aqueous medium by means of the synthesis of said block copolymers, performed by heating the reaction medium at a temperature of 60 to 120° C., the final block copolymer containing between 10 and 50 mol. % of the macroinitiator which is water soluble and the hydrophobic monomer conversion rate being at least 50%. According to the invention, the weight ratio of hydrophilic fraction of the filamentous particles is less than 25 wt %.

Abstract: The invention relates to a process for the preparation of an aqueous dispersion of polymer particles in an aqueous medium employing a living macroinitiator requiring a reinitiation temperature of less than 100° C. Application of the particles obtained in the field of surface coatings.

Abstract: The invention relates to composition-gradient copolymers, comprising: repeat units resulting from the polymerization of at least one first monomer M1, the corresponding homopolymer of which exhibits a glass transition temperature Tg1 of less than 20° C., said repeat units representing from 15 to 40% by weight, with respect to the total weight of the copolymer; repeat units resulting from the polymerization of at least one second monomer M2, the corresponding homopolymer of which exhibits a glass transition temperature Tg2 of greater than 20° C., said repeat units representing from 45% to 65% by weight, with respect to the total weight of the copolymer; hydrophilic repeat units resulting from the polymerization of a least one third monomer M3, said repeat units representing from 10 to 25% by weight, with respect to the total weight of the copolymer.

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 invention relates to a method for preparing a copolymer having a backbone based on methacrylate units, comprising a step involving the polymerization of one or more precursor methacrylate monomers of said units in the presence of: a polymerization initiator; at least RAFT-type transfer agent which can generate a primary radical; and at least one comonomer selected from among styrene monomers and acrylate monomers. The invention also relates to the resulting copolymers capable of being obtained according to this process, in particular block copolymers, in particular block copolymers, and to the use thereof as additives for plastic materials.

Abstract: The present invention relates to the use of composite materials as thickening agents for aqueous solutions, said material comprising carbon nanotubes (CNTs) and at least one hydrophilic (co)polymers. The invention relates more particularly to the use of the materials described above as thickening agents n one of the fields chosen: from the following: the papermaking field, the oil field and also the fields of paint, water treatment, detergents, ceramics, cements, or hydraulic binders, civil engineering, inks and varnishes, and textile sizing.

Abstract: The invention relates to composition-gradient copolymers, comprising: repeat units resulting from the polymerization of at least one first monomer M1, the corresponding homopolymer of which exhibits a glass transition temperature Tg1 of less than 20° C., said repeat units representing from 15 to 40% by weight, with respect to the total weight of the copolymer; repeat units resulting from the polymerization of at least one second monomer M2, the corresponding homopolymer of which exhibits a glass transition temperature Tg2 of greater than 20° C., said repeat units representing from 45% to 65% by weight, with respect to the total weight of the copolymer; hydrophilic repeat units resulting from the polymerization of a least one third monomer M3, said repeat units representing from 10 to 25% by weight, with respect to the total weight of the copolymer.

Abstract: The invention relates to a process for the preparation of an aqueous dispersion of polymer particles in an aqueous medium employing a living macroinitiator requiring a reinitiation temperature of less than 100° C. Application of the particles obtained in the field of surface coatings.

Abstract: The invention relates to a method for preparing a living polymer comprising methacrylic and/or methacrylate units using a monofunctional or polyfunctional alkoxyamine consisting in polymerising one or several types of methacrylic an/or methacrylate units.

Abstract: The present invention relates to the use of poly acrylic and/or methacrylic macroinitiators in the free radical addition reaction of vinyl aromatic monomers to improve the properties of the resulting copolymer and/or composite. More particularly, the present invention relates to the production of poly acrylic and/or poly methacrylic macroinitiators having nitroxyl end groups. Using such macroinitiators in the free radical addition reaction of vinyl aromatics such as polystyrene compatibilizes the acrylic monomer in the vinyl aromatic matrix thereby improving the properties of the resulting polymer.

Abstract: “Process for the preparation of a film or coating on a solid substrate, comprising at least one step of applying to the substrate an aqueous dispersion of polymer particles, composed of a mixture, on the one hand, of one or more block copolymers and, on the other hand, of one or more random copolymers and/or homopolymers; or of a coating composition containing said aqueous dispersion. Said coating composition is, in particular, a paint, a composition for the coating of textiles, of leather or of non-woven fabrics; a composition for the coating of paper; an adhesive composition. Film or coating capable of being obtained by this process.