CATALYSTS, A PROCESS FOR THEIR PRODUCTION AND THEIR USE FOR THE PRODUCTION OF ISOCYANURATE POLYISOCYANATE

摘要

The present invention is directed to catalysts obtained by mixing alkali fluorides with quaternary ammonium or phosphonium salts. The present invention is also directed to a process for the production of these catalysts by stirring alkali fluorides and quaternary ammonium or phosphonium salts in alcohol, separating any deposits formed, removing the alcohol and converting the catalyst into useful form by dilution in solvents or absorption onto support materials. Finally, the present invention is directed to the use of the new catalysts as trimerization catalysts for the production of polyisocyanates containing isocyanurate groups.