Process for producing aromatic polyimides

US10745520B2 · kind B2 · utility

Assignees

• CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE · FR
• UNIVERSITE CLAUDE BERNAD LYON 1 · FR
• UNIVERSITÉ JEAN MONNET SAINT-ETIENNE · FR
• RHODIA OPERATIONS · FR
• INSTITUT NATIONAL DES SCIENCES APPLIQUÉES DE LYON · FR

Inventors

• Stéphane Jeol · Cumming, US
• René ROSSIN · Francheville, FR
• Vincent Mollet · Vernaison, FR
• Benjamin Paci · Maizières-lès-Metz, FR
• Francoise Fenouillot-Rimlinger · L'Isle-d'Abeau, FR
• Alain Rousseau · Orléans, FR

Key dates

• Filing date: Dec 17, 2015
• Grant date: Aug 18, 2020
• Expiry date: Dec 17, 2035

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G73/1067
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

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).