This invention relates to a process for separating one (or more) oligomeric or polymeric compound(s) (A) obtained by polymerization of isocyanate monomers (A.sub.1) or copolymerization of isocyanate monomers with another polymerizable compound (A.sub.2), in particular a polyol, the said compound(s) A having a viscosity (a), from the unconverted monomer(s), this process comprising addition to the said compound(s) (A) of one (or more) compound(s) (B) consisting of the product of polymerization of isocyanate monomers (B.sub.1) or of copolymerization of isocyanate monomers with another polymerizable compound (B.sub.2), in particular a polyol, the said compound(s) (B) having a viscosity (b) and the ratio of the viscosities b/a being less than 1/1.5, preferably less than 1/2, and co-distillation of (A) and (B), in order to separate the compound(s) (A) from the corresponding unconverted monomers.

Этот вымысел относит к процессу на отделять одно (или больше) олигомерное или полимерный compound(s) (A) полученный полимерностью мономеров изоцианата (A.sub.1) или copolymerization мономеров изоцианата с другой polymerizable смесью (A.sub.2), в частности полиол, сказанный compound(s) а имея выкостность (a), от unconverted monomer(s), это отростчатое состоя из добавление к сказанному compound(s) (A) одного (или больше) compound(s) (B) consist of продукт полимерности мономеров изоцианата (B.sub.1) или copolymerization мономеров изоцианата при другая polymerizable смесь (B.sub.2), в частности полиол, сказанный compound(s) (B) имея выкостность (b) и коэффициент выкостностей b/a чем 1/1.5, предпочтительн меньш чем 1/2, и чо-vygonka из (A) и (b), отделить compound(s) (A) от соответствовать unconverted мономеры.