Method of making a high molecular weight, monoesterified...

C - Chemistry – Metallurgy – 08 – G

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C08G 73/10 (2006.01) C08J 3/24 (2006.01)

Patent

CA 2711694

The present disclosure relates to a high molecular weight, monoesterified polyimide polymer. One method as de- scnbed herein relates to making the high molecular weight, monoestenfied polyimide polymer. According to its broadest aspect, the method for making the high molecular weight, monoesterified polyimide polymer compnses the following steps (a) prepanng a polyimide polymer comprising carboxylic acid functional groups from a reaction solution comprising monomers and at least one solvent, and (b) treating the polyimide polymer with a diol at esterification conditions in the presence of dehydrating conditions to form a monoestenfied polyimide polymer, wherein the dehydrating conditions at least partially remove water produced during step (b). Such high molecular weight, monoesterified polyimide polymers are useful in forming crosslinked polymer membranes for the separation of fluid mixtures.

La présente invention concerne un polymère polyimide monoestérifié de poids moléculaire élevé, et un procédé de fabrication de ce polymère polyimide monoestérifié de poids moléculaire élevé. Dans son aspect le plus large, le procédé de fabrication du polymère polyimide monoestérifié de poids moléculaire élevé consiste à : (a) préparer un polymère polyimide comprenant des groupes fonctionnels d'acide carboxylique à partir d'une solution de réaction comprenant des monomères et au moins un solvant; (b) traiter le polymère polyimide avec un diol dans des conditions d'estérification en présence de conditions de déshydratation de façon à obtenir un polymère polyimide monoestérifié, les conditions de déshydratation éliminant au moins partiellement l'eau produite au cours de l'étape (b). Ces polymères polyimides monoestérifiés de poids moléculaire élevé sont utiles dans la formation de membranes polymères réticulées pour la séparation de mélange de fluides.

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