| 摘要 |
The instant invention relates to novel carbodiimidization catalysts consisting of a high molecular weight, insoluble matrix, which is capable of swelling, and low molecular weight carbodiimidization catalysts fixed on, in, or to the matrix via convalent bonds. The novel high molecular weight catalysts are suitable for the preparation of storage stable, catalyst-free equilibrium mixtures of organic isocyanates, carbodiimides and uretone imines. Either the carbodiimide, or the uretone imine or both may contain isocyanate groups. Alternatively, mono and/or polyisocyanates free from carbodiimide and uretone imine groups may be added to the equilibrium mixture. The catalysts according to the invention are capable of bringing about selective carbodiimidization of individual isocyanates in a mixture of various isocyanates. |
