Preparation of polyisocyanates containing uretdione groups...

Details Preparation of polyisocyanates containing uretdione groups... Preparation of polyisocyanates containing uretdione groups...

C - Chemistry, Metallurgy

08

G

C08G 18/02 (2006.01) C08F 4/00 (2006.01)

Patent

CA 2629012

The invention provides a process for isocyanate dimerization (uretdione formation) and a process for preparing polyisocyanates having a high content of uretdione groups, using specific phosphines as catalysts. The phosphines have one or two tertiary alkyl radicals bound directly to phosphorus.

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