Preparation of polyisocyanates containinig isocyanurate...

C - Chemistry – Metallurgy – 07 – D

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C07D 251/34 (2006.01) C08G 18/79 (2006.01)

Patent

CA 2139376

Polyisocyanates containing isocy- anurate groups are prepared by a partial trimerization of (cyclo)aliphatic diisocyanates in the presence of at least one trimerization catalyst selected from the group consisting of te- traalkylammonium alkyl carbonates of the formula (I) (see formula I) (quaternary ammonioalkyl) carbonates having a betaine structure of the formula (II) (see formula II) and the preferred use of the polyisocyanates containing isocyanu- rate groups which are obtainable in this way is as polyisocyanate component in polyurethane finishes.

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