Virsol

Hutchinson

Elf Atochem S.a.

Unisor

G&eacute;rard Riess

Nicole Bru-Magniez

Patrick Couvreur

Claude Roques-Carmes

Pascal Breton

Pierre Hoerner

Fran&ccedil;ois Lescure

Xavier Guillon

Andr&eacute; Cheymol

Turgut Nugay

Philippe Legros

Yves Sully

Agn&egrave;s Calleja

Virginie Larras

Colette Crepeau

Ren&eacute; Guy Busnel

Surfactant copolymers based on methylidene malonate

1.5-Diethenylnaphthalene compounds and bifunctional primers for anionic polymerization prepared therefrom

The method includes the steps of: preparing an organic mixture of oil, monomers selected among acrylic acid&mdash;and methacrylic acid esters and at most 25% of an acrylic or methacrylic monomer having an acide, amide, amine or epoxy group; placing the mixture in mini-emulsion in an aqueous phase in the presence of a co-solvent, preferably of the polyalkylene glycol type; and copolymerising the monomers in emulsion. When the emulsion is applied in a thin coating on a metal surface, it provides simultaneously a dry appearance, efficient protection and a pre-lubricating effect.

Method for preparing an aqueous polyacrylate emulsion for protecting metal surface against corrosion and pre-lubrication thereof and resulting emulsion

Methylidene malonate nanoparticles

The invention concerns stable emulsions, a method for preparing said emulsions and the elastomer films containing them. Said stable emulsions of at least one chemical substance x in an elastomer solution, to be used for preparing an elastomer film, comprise (1) a phase A containing an elastomer dissolved in an organic apolar or slightly polar solvent a, wherein is dispersed (2) a phase B containing at least said chemical substance x, in solution or dispersed in a polar solvent b, non-miscible with phase A and (3) at least a dispersing agent selected from the group consisting of block or grafted polymers. Said emulsions are characterised in that the dispersed phase B droplets have a diameter &gE;10 &mgr;m; said emulsion comprises, for stabilising said dispersed phase B, besides at least one dispersing copolymer comprising poly A sequences, compatible with phase A and poly B sequences compatible with phase B, at least a particulate stabiliser selected from the group consisting of solid organic compounds of dimension ranging between 30 nm and 10 &mgr;m, or solid mineral compounds of dimension ranging between 5 nm and 10 &mgr;m, whereof the surface state is organophilic; the mass fraction &oslash; of the dispersed phase (phase B) in the emulsion ranges between 0.01 and 0.2; the mass fraction of block or grafted copolymers, &oslash; , expressed relative to dispersed phase B ranges between 0.001 and 0.3, preferably between 0.01 and 0.2 and the mass fraction of particulate stabiliser (SP), &oslash; , expressed relative to dispersed phase B ranges between 0.001 and 0.5.

Stable emulsions, preparation methods and applications

Multilayer elastomer films (multilayer material) comprising at least one continuous layer, carrying an active chemical substance (such as corrosion inhibitors, lubricants or alternatively biocides for medical use), inserted between inert elastomer barrier layers, processes for the preparation and various applications of these films. The multilayer polymeric material comprises at least one layer A composed of a gel which is reversible or non-reversible, as a function of the temperature, and which carries at least one active chemical substance x, and at least two barrier layers E comprising a synthetic elastomer e, the said layers being held together by a polymeric bonding agent y incorporated in at least one of the said layers A or E and/or by an independent bonding layer Z comprising a polymer z and/or by a chemical or physical treatment of at least one of the said layers A or E.

Multilayer material, process of preparation and applications

The invention relates to a method for the preparation of nanoparticles formed from a random polymer of at least one compound of formula (I)

Method for preparing malonate methylidene nanoparticles, nanoparticles optionally containing one or several biologically active molecules

Growing community of inventors

Mulhouse, France

Gérard Riess

Growing community of inventors

Mulhouse, France

G&eacute;rard Riess

Gérard Riess