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US 9,850,338 B2Granted
Process for isocyanate modification using spirocyclic ammonium salts as catalyst
AssigneeCovestro Deutschland AG
InventorFrank Richter
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Abstract
The Invention relates to a process for modifying isocyanates, in which at least one monomeric organic isocyanate having an NCO functionality>1 is oligomerized in the presence of at least one spirocyclic ammonium salt having a cation of the formula I as catalysts for the isocyanate modification, where substituents X and Y in the N positions are identical or different, substituted or unsubstituted C2-C20-alkylene chains optionally interrupted by heteroatoms (O, N, S) and by aromatic rings. The invention further relates to the use of such a catalyst.
Claims18
A process for modifying isocyanates comprising:
- oligomerizing at least one monomeric organic isocyanate having an NCO functionality >1 in the presence of at least one catalyst comprising at least one spirocyclic ammonium salt having a cation of the formula I
- wherein the nitrogen substituents X and Y are independently identical or different, substituted or unsubstituted C2-C20-alkylene chains, optionally interrupted by heteroatoms (O, N, S) and aromatic rings.
Dependencies are inferred from the claim text.