The present invention is directed to isocyanato isocyanurates prepared from diisocyanates which contain a sterically unhindered isocyanate group bound to a primary aliphatic carbon atom and a sterically hindered isocyanate group which is bound to a tertiary carbon atom forming part of a cycloaliphatic ring system, said diisocyanate having an NCO content of about 20 to 50% by weight. The present invention is further directed to a process for preparing these isocyanato isocyanurates by catalytic trimerization and the use of the isocyanato isocyanurates in a process for the production of polyisocyanate polyaddition products, preferably two-component polyurethane stoving lacquers.
本发明涉及由含有一个位于初级脂肪碳原子上的空间不受阻碍的
异氰酸酯基团和一个位于环状脂环族系统的三级碳原子上的空间受阻碍的
异氰酸酯基团的二
异氰酸酯制备的异
氰酸脲。该二
异氰酸酯的NCO含量约为20至50重量%。本发明还涉及通过催化三聚反应制备这些异
氰酸脲的方法,以及将异
氰酸脲用于生产聚
异氰酸酯加成物的过程,优选为双组分聚
氨酯烘漆。