Polyisocyanates which contain carbodiimide groups and which are stable in storage
First Claim
1. A composition of matter comprising a storage-stable, catalyst-free, equilibrium mixture of an organic carbodiimide, an organic uretone imine, and an organic isocyanate produced by the process comprising:
- (a) contacting an organic mono- and/or polyisocyanate, optionally dissolved in an inert solvent, with a high molecular weight, insoluble catalyst, said catalyst comprising a high molecular weight, insoluble inorganic or organic matrix and a low molecular weight carbodiimidization catalyst linked to said matrix via ionic bonds, and(b) removing said insoluble catalyst when the desired degree of carbodiimidization has been reached.
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Abstract
The present invention relates to stable equilibrium mixtures of carbodiimides, uretone imines and organic isocyanates and to stable solutions of carbodiimides and uretone imines in polyisocyanates which are free from carbodiimide groups. Either the carbodiimide, or the uretone imine, or both, may contain isocyanate groups. The present invention also relates to a process for the preparation of such products by "heterogeneous catalysis" and the use thereof for the production of polyurethane resins. According to one embodiment of the process according to the instant invention, individual isocyanates in a mixture of various isocyanates may be carbodiimidized selectively.
66 Citations
19 Claims
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1. A composition of matter comprising a storage-stable, catalyst-free, equilibrium mixture of an organic carbodiimide, an organic uretone imine, and an organic isocyanate produced by the process comprising:
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(a) contacting an organic mono- and/or polyisocyanate, optionally dissolved in an inert solvent, with a high molecular weight, insoluble catalyst, said catalyst comprising a high molecular weight, insoluble inorganic or organic matrix and a low molecular weight carbodiimidization catalyst linked to said matrix via ionic bonds, and (b) removing said insoluble catalyst when the desired degree of carbodiimidization has been reached. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A process for preparing a storage stable, catalyst-free, equilibrium mixture of an organic carbodiimide, an organic uretone imine, and an organic isocyanate comprising the steps:
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(A) contacting an organic mono and/or polyisocyanate, optionally dissolved in an inert solvent, with a high molecular weight, insoluble catalyst, said catalyst comprising a high molecular weight, insoluble, inorganic or organic matrix and a low molecular weight carbodiimidization catalyst linked to said matrix via ionic bonds, and (B) removing said insoluble catalyst when the desired degree of carbodiimidization has been reached. - View Dependent Claims (19)
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Specification