Process for the production of polyisocyanates containing uretdio

Details Process for the production of polyisocyanates containing uretdio Process for the production of polyisocyanates containing uretdio

1991-08-09

1993-06-08

Ford, John M.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

528 45, 528 67, C07D22900, C08G 1880

Patent

active

052181111

ABSTRACT:
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 m.sup.2 /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 containing uretdione and isocyanurate groups by the dimerization and trimerization of a proportion of the isocyanate groups of organic diisocyanates.

REFERENCES:
patent: 2671082 (1954-03-01), Stallmann
patent: 3489744 (1970-01-01), Schwarcz et al.
patent: 3919195 (1975-11-01), Bakhitov et al.
patent: 3993641 (1976-11-01), Tiemann et al.
patent: 4614785 (1986-09-01), Richter et al.
patent: 4837321 (1989-06-01), Kerimis et al.
patent: 5013838 (1991-05-01), Scholl
patent: 5043092 (1991-08-01), Pedain et al.
Chemical Abstracts, vol. 100, No. 2, 1984, Ref. No. 7216s.

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