一种用于通过在叔存在有机聚异氰酸异氰酸酯基团的二 - 和/或三聚生产低聚多异氰酸酯的过程。 膦或全烷基化Phosphorigsäuretriamiden作为催化剂，并通过加入催化剂毒物在低聚的特定期望程度的二和/或三聚化反应终止后，在作为催化剂毒物是磺酰异氰酸酯，任选地与有机酸氯化物正在开展，并使用如此获得的低聚多异氰酸酯作为多异氰酸酯组分 生产聚氨酯塑料。

A process for the production of oligomeric polyisocyanates by di- and / or trimerization of the isocyanate groups of organic polyisocyanates in the presence of tert. Phosphines or peralkylated Phosphorigsäuretriamiden as the catalyst and termination of the di- and / or trimerization reaction at the particular desired degree of oligomerization by adding a catalyst poison, being optionally used as a catalyst poison is a sulfonyl isocyanate with an organic acid chloride, and to the use of the thus obtained oligomeric polyisocyanates as the polyisocyanate component with the production of polyurethane plastics.