Polyisocyanates containing iminooxadiazine dione groups and...

Details Polyisocyanates containing iminooxadiazine dione groups and... Polyisocyanates containing iminooxadiazine dione groups and...

C - Chemistry, Metallurgy

08

G

C08G 18/02 (2006.01) C07D 273/04 (2006.01) C08G 18/18 (2006.01)

Patent

CA 2244486

The present invention relates to a process for the preparation of polyisocyanates by oligomerizing isocyanates corresponding to formula I (OCN-CH2)X (I) wherein X represents the residue obtained by removing the OCN-CH2 group from a monomeric polyisocyanate, wherein the residue contains 3 to 20 carbon atoms and at least one NCO group, in the presence of hydrogen-polyfluoride oligomerization catalysts corresponding to formula II Mn+ n[F-((HF)m] (II) wherein M represents an n-valent cation and m is >= 0.1. The present invention is also directed to the polyisocyanates obtained by this process.

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