FIELD: technological processes.
SUBSTANCE: invention relates to a process for separating monomeric isocyanates from isocyanate-containing mixtures from prepolymers and monomeric isocyanates that contain isocyanate groups, by preparing the mixture in a solvent and dialyzing the dissolved mixture against a solvent using a permeable membrane with a pore size in the range of 5 to 400 nm, wherein the solvent used is a polar solvent, and the membrane used is a membrane of polyether ether ketone, polysulfone or polyether sulfone.
EFFECT: process can be used, in particular, to separate monomeric isocyanates from prepolymers containing isocyanate groups to produce adhesives, insulation and mounting foam.
9 cl, 1 dwg, 3 ex
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