The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 18, 2020
Filed:
Dec. 17, 2015
Rhodia Operations, Paris, FR;
Institut National Des Sciences Appliques DE Lyon, Villeurbanne, FR;
Centre National DE LA Recherche Scientifique, Paris, FR;
Universite Claude Bernard Lyon 1, Villeurbanne, FR;
Universite Jean Monnet Saint-etienne, Saint Etienne, FR;
Stéphane Jeol, Cumming, GA (US);
René Rossin, Francheville, FR;
Vincent Mollet, Irginy, FR;
Benjamin Paci, Woippy, FR;
Françoise Fenouillot-Rimlinger, L'Isle D'Abeau, FR;
Alain Rousseau, Bron, FR;
CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE, Paris, FR;
UNIVERSITE CLAUDE BERNARD LYON1, Villeurbanne, FR;
UNIVERSITE JEAN MONNET SAINT-ETIENNE, Saint Etienne, FR;
Rhodia Operations, Paris, FR;
Institut National Des Sciences Appliquees De Lyon, Villeurbanne, FR;
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).