Rhodia Operations

Centre National De La Recherche Scientifique

Universite Claude Bernard – Lyon1

Institut National Des Sciences Appliquees De Lyon

Université Jean Monnet Saint-Étienne

Benjamin Paci

Stéphane Jeol

Vincent Mollet

Françoise Fenouillot-Rimlinger

René Rossin

Alain Rousseau

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

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Woippy, France

Benjamin Paci