Arkema France

Centre National De La Recherche Scientifique

Arkema Inc.

Universite Claude Bernard – Lyon1

Université Paul Sabatier (toulouse Iii)

Université Pierre Et Marie Curie

Ecole Superieure De Chimie Physique Electronique De Lyon

Polymem

Universite Pierre Et Marie Curie, Centre National De La Recherche Scientifique

Stephanie Magnet

Olivier Guerret

Bernadette Charleux

Pierre Gerard

Laurence Couvreur

Raber Inoubli

Segolene Brusseau

Manuel Hidalgo

Scott Charles Schmidt

Thibaut Savart

Peter A Callais

Barbara L Stainbrook

Jean-Michel Espenan

Nicolas Passade-Boupat

Julien Nicolas

Olivier Lorain

Jean-Francois Lahitte

Jean-Christophe Rouch

Helene Hediger

Jean-Christophe Remigy

Catherine Lefay

Scott C Schmidt

Nicholas Passade Boupat

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.

Copolymer having amphiphilic blocks, and use thereof for manufacturing polymer filtration membranes

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&#xb0; 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 %.

Filamentous polymer particles and method for preparing same by means of controlled radical polymerisation in emulsion

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&#xb0; 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%. A second aspect of the invention relates to a method for modifying the rheology of an organic or aqueous solution using said filamentous polymer particle.

Filamentous polymer particles and use thereof as rheology modifiers

The invention relates to composition-gradient copolymers, comprising:

Rigid-matrix composition-gradient copolymers which are soluble and/or dispersible in water and in organic solvents

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.

Copolymers based on methacrylate units, preparation method thereof and use of same

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.

Use of copolymers with a composition gradient as stabilizers in emulsion free-radical polymerization

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.

Method for preparing a living polymer comprising methacrylic and/or methacrylate units

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.

Methods of producing vinyl aromatic polymers using (meth)acrylic macroinitiators

The present invention relates to a process for the preparation in aqueous solution of water-soluble acrylic polymers or for the preparation in aqueous dispersion of water-dispersible acrylic co-polymers, polymerised from, the total being 100 mol %:

Water-soluble or water-dispersible acrylic dispersants obtained by controlled radical polymerization

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Morlanne, France

Stephanie Magnet