Roquette Freres

Setup Performance

Jerome Gimenez

Didier Lagneaux

Henri Sautel

Leon Mentink

Thierry Feron

Laurent Goujard

Anne-Carine Brosse

Rene Saint Loup

The object of the invention is a method for preparing a polyamide from one or several monomers adapted for the preparation of polyamide characterized in that the selected monomer(s), is(are) introduced without any preliminary reaction and without any preliminary preparation of the corresponding salt, in an extruder including at least two conveying screws rotating co-rotatively and in that all the reaction and polycondensation steps, initially starting from the selected monomer(s), and giving the possibility of ending up with the desired polyamide, are conducted in an extruder including at least two conveying screws rotating co-rotatively, and polycondensation is achieved by carrying out at least two operations for discharging the by-product(s) formed by the polycondensation reaction.

Method for preparing a polyamide by reactive extrusion, and extruder adapted for the implementation of such a method

A novel starch-based composition includes: (a) at least 45% by weight of at least one soluble starch, (b) at most 55% by weight of at least one non-biodegradable, non-amylaceous polymer, and (c) a bonding agent carrying at least two functional groups capable of reacting with molecules carrying functions including an active hydrogen, these amounts being expressed with respect to solids and relative to the sum of (a) and (b). A method for preparing such a starch-based composition and a thermoplastic composition prepared by heating such a composition are also described.

Thermoplastic compositions based on soluble starch and method for preparing such compositions

Process for preparing a composition based on a synthetic polymer includes: introducing, into a reactor containing a softened or molten synthetic polymer, a non-plasticized starchy component and a plasticizer of the latter; and kneading the mixture obtained under conditions sufficient to obtain the plasticization of the starchy component by the plasticizer, and a homogeneous mixture of the synthetic polymer and of the plasticized starchy component. The reactor may especially be a co-rotating or counter-rotating single-screw or twin-screw extruder, for example a co-rotating twin-screw extruder. The synthetic polymer may advantageously be chosen from the group including polyethylenes (PE) and polypropylenes (PP), which are functionalized or unfunctionalized, polyamides (PA), thermoplastic polyurethanes (TPU), styrene-ethylene-butylene-styrene (SEBS) copolymers, preferably that are functionalized, amorphous polyethylene terephthalates (PETG) and blends thereof. The resulting compositions have improved characteristics, especially in terms of coloration and of mechanical properties, for example in terms of elongation at break.

Process for preparing compositions based on a starchy component and on a synthetic polymer

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Villeurbanne, France

Jerome Gimenez