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US 4,067,820 AGranted
High molecular weight, insoluble carbodiimidization catalysts
AssigneeBayer Aktiengesellschaft
InventorsKuno Wagner, Hans-Dieter Block, Walter Schafer
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AssigneeBayer Aktiengesellschaft
InventorsKuno Wagner, Hans-Dieter Block, Walter Schafer
Estimating the term…
The instant invention relates to novel carbodiimidization catalysts consisting of a high molecular weight, insoluble matrix and low molecular weight carbodiimidization catalysts fixed to the matrix via ionic bonds. The novel high molecular weight catalysts are suitable for the preparation of storage stable, catalyst free, equilibrium mixtures of organic carbodiimides, uretone imines and isocyanates. 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.
High molecular weight carbodiimidization catalysts which are insoluble in water and in polyisocyanates and which consist of a high molecular weight, insoluble, organic or inorganic matrix and low molecular weight carbodiimidization catalysts bound to this matrix via ionic bonds.
A process for the preparation of high molecular weight carbodiimidization catalysts comprising contacting a high molecular weight, insoluble, inorganic or organic matrix which contains ionizable groups with a solution of low molecular weight carbodiimidization catalysts which contain ionizable groups, the charge of which is opposite in sign to that of the matrix.
Dependencies are inferred from the claim text.