Polyamines and a process for their production

摘要

Polyamines containing aromatically bound primary amino groups having an NH2-content of from 0.19 to 20.3 wt % are produced by a single stage process. A compound containing aromatically bound NCO-groups and having an isocyanate content of from 0.5 to 40 wt % is hydrolyzed with an excess of water in the presence of a water-miscible polar solvent and optionally a catalyst. The hydrolysis is carried out at a temperature of from -10 DEG to 150 DEG C. in a manner such that the reaction mixture is substantially homogeneous. The water-miscible polar solvent generally has a boiling point of from 56 DEG to 250 DEG C. and a dielectric constant of at least 10. This polar solvent is used in a quantity of at least 5 parts solvent for every 100 parts of isocyanate. Tertiary amines are the preferred catalysts. These polyamines are particularly useful in the production of polyurethanes.