PROCESS FOR FRACTIONATING A MIXTURE OF POLYISOCYANATES

摘要

Method of fractionating a mixture ofpolyisocyanates 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.