A process for preparing polyisocyanates containing...

Details A process for preparing polyisocyanates containing... A process for preparing polyisocyanates containing...

C - Chemistry, Metallurgy

07

D

C07D 273/04 (2006.01) C08G 18/79 (2006.01)

Patent

CA 2272755

The present invention relates to a process for the preparation of trimerized polyisocyanates that contain 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 a quaternary phosphonium polyfluoride trimerization catalyst corresponding to the formula R4P+ F- .cndot. n(HF) wherein R represents identical or different, optionally branched aliphatic, aromatic and/or araliphatic C1-C20 groups, or two or more R groups may also form, with one another and with the phosphorus atom, saturated or unsaturated rings and n has a value of 0.1 to 20.

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