Process for fractionating a mixture of polyisocyanates

Details Process for fractionating a mixture of polyisocyanates Process for fractionating a mixture of polyisocyanates

B - Operations, Transporting

01

D

B01D 61/02 (2006.01) B01D 61/38 (2006.01) C08G 18/76 (2006.01)

Patent

CA 2697401

Method of fractionating a mixture of polyisocyanates in the liquid phase, optionally in the presence of a suitable solvent or mixture of two or more solvents, by means of a selectively permeable membrane into a permeate stream and a retentate stream of polyisocyanate compositions different to each other and different to the original mixture.

La présente invention a trait à un procédé de fractionnement d'un mélange de polyisocyanates en phase liquide, éventuellement en présence d'un solvant ou d'un mélange d'au moins deux solvants adaptés, utilisant une membrane sélectivement perméable qui va fractionner ledit mélange en un courant de perméat et en un courant de rétentat de compositions de polyisocyanates, différents l'un de l'autre et différents du mélange d'origine.

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