Rhodia Operations

Centre National De La Recherche Scientifique

Universite Claude Bernard – Lyon1

Institut National Des Sciences Appliquees De Lyon

Université Jean Monnet Saint-Étienne

Polytechnyl, Sas

Vincent Mollet

Stéphane Jeol

Gilles Orange

Jean-Francois Thierry

Jean-François Thierry

Benjamin Paci

Sébastien Lomel

Matthieu Helft

Roland Durand

Françoise Fenouillot-Rimlinger

Olivier Gilbain

Alain Rousseau

Cédric Fillon

René Rossin

Manuel De Soyres

Sebastien Lomel

Cedric Fillon

Sébastien Plouchart

Tomasz Pokropski

The invention relates to a process for producing aromatic polyimides, comprising the following steps: (a) preparation of one or more solid salt(s) by reacting one or more aromatic tetracarboxylic acid(s) and one or more diamine(s) according to a mole ratio ranging from 0.95 to 1.05; (b) drying of the solid salt(s), (c) addition, to the dry salt resulting from step (b), of one or more compound(s) (C) comprising one or more group(s) chosen from a carboxylic acid group, an anhydride group, an ester group and an acyl chloride group; (d) solid-state polymerization of said solid salt(s) in the presence of the compound(s) (C).

Process for producing aromatic polyimides

The present invention relates to thermoplastic polyimides and to the synthesis thereof. The invention relates in particular to a method for manufacturing semi-aromatic thermoplastic polyimides by means of the solid-state polymerization of a solid ammonium carboxylate salt formed from an aliphatic diamine and an aromatic tetracarboxylic acid, thereby enabling powders having controlled particle sizes to be produced.

Thermoplastic polyimides

Uses of low molecular mass, non-evolutive polyamide resins for making composite articles are described. Articles obtained from such resins having good mechanical properties, such as rigidity, breaking load, impact resistance, and fatigue behavior in particular, even when the articles are manufactured according to cycles shorter than those usually used, and without any processing before or after the manufacture of the composite articles, are also described.

Composite polyamide article

Polyamides, e.g., polyhexamethylene adipamide, are continuously produced via the following stages:

Continuous production of polyamides

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Irginy, France

Vincent Mollet