Catalysts for the preparation of carbodiimide foams and elastomers

摘要

New compounds which are salts of the formula A+ B- where A+ is a quaternary ammonium cation and B- is a tetrahedral boron-oxygen complex anion are prepared from boric acid by reaction with a hydroxyl compound and a quaternary ammonium hydroxide. The salts are used as catalysts to prepare carbodiimides and isocyanurates from isocyanates which can be in the form of foamed resins.