Preparation of polyisocyanates containing uretdione groups
AssigneeBayer MaterialScience AG
InventorsFrank Richter, Reinhard Halpaap, Hans-Josef Laas, Andreas Hecking
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Abstract
A method of dimerizing isocyanates including reacting the isocyanates in the presence of phosphines containing at least one directly phosphorus-attached bicyclic, cycloaliphatic radical. The polyisocyanate compositions obtained as described above can be used in mouldings, coating materials, adhesives, sealants or adjuvants that further include the polyisocyanate compositions and one or more materials selected from antioxidants, light stabilizers, pigments, fillers, additives, levelling assistance, defoamers and matting agents. The coating materials, adhesives or sealants can be used to coat substrates.
Claims6
A method of dimerizing isocyanates comprising reacting said isocyanates in the presence of phosphines containing at least one directly phosphorus-attached bicyclic, cycloaliphatic radical.
A process for dimerizing isocyanates, comprising reacting a mixture that includes
- a) at least one organic isocyanate having an NCO functionality ≧2,
- b) a catalyst comprising at least one phosphine containing at least one directly phosphorus-attached bicyclic, cycloaliphatic radical, and
- c) optionally solvents.
Dependencies are inferred from the claim text.