Preparation of prepolymers containing isocyanate groups

Abstract From the Canadian patent

In a process for preparing prepolymers containing isocyanate groups by reacting organic isocyanates (a) with H-acid compounds (b), the reaction to give the prepolymer is carried out directly in the process stream of the isocyanate-producing plant. Also provided are the prepolymers containing isocyanate groups prepared is this way, their use for preparing PUR and also a process for preparing PUR by reacting at least one prepolymer containing isocyanate groups, if desired in admixture with further organic and/or modified organic isocyanates (a) with compounds, containing at least two reactive hydrogen atoms (b) in the presence of, if desired, blowing agents (c) catalysts (d) and, if, …