PROCESS FOR THE PREPARATION OF ORGANIC POLYISOCYANATES CONTAINING BIURET AND/OR UREA GROUPS, AS WELL AS DISPERSIONS OF POLYISOCYANATES CONTAINING UREA GROUPS IN A DIISOCYANATE FREE OF UREA

摘要

The present invention relates to a process for the preparation of compounds selected from the group consisting of a polyisocyanate containing urea groups and a polyisocyanate containing biuret groups comprising (a) introducing an organic polyisocyanate into a reaction vessel, and (b) injecting an organic polyamine containing at least two primary amino groups into the organic polyisocyanate in the reaction vessel at a pressure of from about 2 to 1000 bar through a straight jet nozzle having an internal diameter of from about 0.