Process for preparing polyisocyanates containing iminooxadiazine

Details Process for preparing polyisocyanates containing iminooxadiazine Process for preparing polyisocyanates containing iminooxadiazine

1999-05-25

2000-08-22

Sergent, Rabon

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

Organic compounds

Chalcogen in the nitrogen containing substituent

528 51, 528 52, 528 73, 544193, 544222, C07D27304, C07D25134, C08G 1879

Patent

active

061074845

ABSTRACT:
The present invention relates to a process for the production of trimerized polyisocyanates containing at least 30 mole % of iminooxadiazinedione groups (asymmetric trimers) in the trimer mixture by catalytically trimerizing a starting isocyanate selected from organic di- or polyisocyanates having a number average molecular weight of 140 to 600 and containing aliphatically, cycloaliphatically and/or araliphatically bound isocyanate groups in the presence of quaternary ammonium and phosphonium fluoride trimerization catalysts corresponding to the formula

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Nambu Y et al: "Synthesis of novel aromatic isocyanurates by the fluoride-catalyzed selective trimerization of isocyanates" Journal of Organic Chemistry, Bd. 58, Nr. 7, 1993, Seiten 1932-4, XP002113530.
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