Producing polyamines, comprises reacting free isocyanate groups of polyisocyanate prepolymer in presence of solvent, under influence of water and in presence of catalyst, and separating volatile components of reaction mixture

摘要

Producing polyamines with primary amino groups and a portion of monomeric di- or triamine of less than 0.1 wt.%, comprises reacting (a) the free isocyanate (NCO) groups of a polyisocyanate prepolymer, (a1) in the presence of a solvent, (a2) under influence of water and (a3) in the presence of a catalyst, (a4) carrying out the reaction under compliance of a temperature range of 20-100[deg] C, preferably 50-70[deg] C, and subsequently separating the volatile components of the resulting reaction mixture by simple vacuum distillation. Producing polyamines with primary amino groups and a portion of monomeric di- or triamine of less than 0.1 wt.%, comprises reacting (a) the free isocyanate (NCO) groups of a polyisocyanate prepolymer having an average NCO functionality of at least 1.5 under carbon dioxide-separation, (a1) in the presence of a solvent in a molar ratio of solvent to NCO group of at least 1 to 1 to at most 50 to 1, preferably at least 5 to 1 and at most 30 to 1, (a2) under influence of water in a molar ratio of water to NCO groups of at least 0.5 to 1 to at most 100-1, preferably 1 to 1 and at most 3 to 1, (a3) in the presence of a catalyst in a molar ratio of catalyst to NCO groups of at least 0.0001 to 1 and at most 1 to 1, preferably at least 0.001 to 0.1, (a4) carrying out the reaction under compliance of a temperature range of 20-100[deg] C, preferably 50-70[deg] C, and subsequently separating the volatile components of the resulting reaction mixture by simple vacuum distillation.