Method for producing polyisocyanates

摘要

The invention relates to a method for making oligomeric isocyanates by reacting diisocyanates in the presence of a catalyst, wherein the catalyst comprises a saline compound prepared from a five-membered N-heterocycles and the N-heterocycle comprises at least one N-H function in the five-membered ring, to the products produced in this way and to polymers prepared from these products.