Dimerization catalysts, a process for their preparation and...

Details Dimerization catalysts, a process for their preparation and... Dimerization catalysts, a process for their preparation and...

B - Operations, Transporting

01

J

B01J 27/16 (2006.01) B01J 31/24 (2006.01) B01J 35/10 (2006.01) C07D 403/14 (2006.01) C08G 18/79 (2006.01)

Patent

CA 2049517

Mo3617 LeA 27,900 DIMERIZATION CATALYSTS, A PROCESS FOR THEIR PREPARATION AND THEIR USE FOR THE PRODUCTION OF POLYISOCYANATES CONTAINING URETDIONE AND ISOCYANURATE GROUPS ABSTRACT OF THE DISCLOSURE The present invention relates to dimerization catalysts which are suitable for the dimerization of organic isocyanates by heterogeneous catalysis, wherein the catalysts contain tertiary phosphines adsorbed onto adsorbent, porous carrier materials having a particle size (90%) of 0.1 to 10 mm, a pore volume of 0.4 to 1.4 ml/g, an average pore diameter of 5 to 50 nm and a specific surface area (BET) of 100 to 700 m2/g. The present invention also relates to a process for the preparation of these catalysts by the adsorption of tertiary phosphines onto these carrier materials, optionally in the presence of inert solvents. Finally, the present invention relates to the use of these catalysts for the preparation of polyisocyanates contain- ing uretdione and isocyanurate groups by the dimerization and trimerization of a proportion of the isocyanate groups of organic diisocyanates. Mo3617

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