Arkema France

Atochem

Elf Atochem S.a.

Arkema Inc.

Atofina

Pierre Nogues

Thierry Briffaud

Philippe Blondel

Annett Linemann

Richard Audry

Helene Egret

Francois Erard

Gilles Hochstetter

Guillaume Le

Michel Glotin

Karine Loyen

Isabelle Betremieux

Jean-Laurent Pradel

Frédéric Malet

Geoffroy Cammage

Maliha Khusrawy

Jean-Claude Moulies

Nathalie Meeschaert

Martine Schneider

Valerie Mailhos-Lefievre

Patrick Borg

Christophe Loret

Héléne Egret

Hélène Egret

The invention concerns a method for producing polyamide from an amino ester of formula NH&#x2014;(CH)&#x2014;COOR, in which R represents an alkyl group and n represents an integer ranging from 5 to 14, comprising:

Polyamide synthesis method

A method for producing a polycondensate powder dispersion, characterised in that it includes at least one step of polycondensation: i) of at least one diester and at least one diamine, and/or ii) at least one amino ester, while stirring, in a solvent that can solubilise both the diamine and the diester and/or the amino ester but not the polyamide that forms during the polycondensation, at a temperature between 30&#xb0; C. and the boiling temperature of the solvent, in order to produce a powder precipitate dispersed in the solvent.

Production of polyamide powders by ester aminolysis

A method for producing a composite material, including an assembly of one or a plurality of synthetic reinforcement fibers, impregnated with at least one thermoplastic polymer having a vitreous transition temperature Tg greater than or equal to 80&#xb0; C. including: i) a step of impregnating said assembly with a precursor composition in the molten state and including: a) at least one prepolymer P(X)n of said thermoplastic polymer, including a molecular chain P having, at the ends n thereof, identical reactive functions X, said prepolymer having a semiaromatic and/or semi-cycloaliphatic structure, b) at least one chain extender including two identical functions Y, which are reactive with at least one of said functions X; ii) a step of polymerization by mass (poly)addition, in the molten state, of said prepolymer with said chain extender, with said thermoplastic polymer of the thermoplastic matrix being the result of said polymerization by mass polyaddition.

Thermoplastic composite material reinforced with synthetic fibers and manufacturing process

The present invention relates to a flexible semiaromatic polyamide composition with a low moisture uptake, made up by weight, the total being 100:

Flexible semiaromatic polyamides with a low moisture uptake

The present invention relates to a flexible semiaromatic polyamide composition with a low moisture uptake comprising, by weight, the total being 100:

The invention concerns a method for hydrogenation of unsaturated polymers in dispersed medium based on an oxidation-reduction system containing hydrazine, an oxidant such as a peroxide and optionally a carboxylic acid. The hydrogenation rate can reach 100% in certain conditions.

Method for hydrogenation of polymers in dispersed medium

A process is presented for the preparation of a latex by the emulsion polymerization at a temperature of between 30 and 90 C. of at least one ethylenically unsaturated monomer in the presence of at least one surfactant and of a seed of polymer particles with a diameter of between 200 and 450 nm. The seed particles represent from 5-25% by weight of the total weight of the monomer and seed. The polymerization is initiated by a mixed water-soluble/fat-soluble system. Also included are lattices obtained from this process.

Latex having a high solids content and a low viscosity and exhibiting a bimodal distribution

Vinyl polymers, e.g., the homo- and copolyvinyl chlorides, are prepared in one or more stages, to a degree of conversion of at least 50%, by suspended emulsion polymerizing at least one vinyl monomer, e.g., vinyl chloride, said at least one monomer having dispersed therein finely divided droplets of an aqueous solution of at least one component of a polymerization initiating system, and wherein the amount of water in said aqueous solution constitutes at least 19%, and preferably at least 20% by weight of the at least one monomer.

Polymeric composition obtained by suspended emulsion polymerization

Hot water and superheated steam resistant barrier films, well adopted as packaging materials, e.g., for perishable comestibles, notably foodstuffs, at least in part include at least one layer of a polymer alloy comprising (a) at least one ethylene-vinyl alcohol (EVOH) copolymer, (b) at least one polypropylene and (c) a compatibilizing amount of at least one compatibilizing agent therefor.

Hot water/superheated stem-resistant EVOH barrier films

Polymer alloys that can facilely be shaped into gas barrier, crack-resistant packaging materials, e.g., by thermoforming, include an ethylene-vinyl alcohol copolymer matrix, a polypropylene disperse phase and a phase-compatibilizing amount of an .alpha.-monoolefin graft copolymer.

EVOH/polypropylene gas-impermeable polymer alloys

Hot water/superheated steam-resistance EVOH barrier films

(Co)polymer particulates soluble in their corresponding (co)monomer composition, e.g., particulates of acrylic, methacrylic or styrene polymers, are produced by finely dispersing an aqueous phase including at least one polymerization initiator in an organic phase which comprises such (co)monomer composition and at least one nonsolvent for such (co)polymer which is miscible with such (co)monomer composition, and suspended emulsion polymerizing such mixed-phase polymerization recipe.

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Bernay, France

Pierre Nogues