Uretdione formation in solution

摘要

Use of organic carbonates and/or organic nitriles with phosphinic catalyst for oligomerization of mono and/or polyisocyanate to uretdione. Independent claims are also included for: (1) the preparation of uretdione group containing polyisocyanate comprising oligomerization of polyisocyanate in the presence of a catalyst system comprising phosphine and organic carbonates and/or organic nitriles; (2) polyisocyanate mixtures, obtained by the above process; and (3) polyurethane plastics and coatings are obtained by using polyisocyanate mixtures.