Process for the preparation of blocked polyisocyanates, and...

Details Process for the preparation of blocked polyisocyanates, and... Process for the preparation of blocked polyisocyanates, and...

C - Chemistry, Metallurgy

07

C

C07C 269/02 (2006.01) C07C 263/16 (2006.01) C07C 265/14 (2006.01) C07D 251/34 (2006.01) C08G 18/10 (2006.01) C08G 18/80 (2006.01) C09D 175/04 (2006.01)

Patent

CA 2143381

The invention relates to a process for the preparation of totally or partially blocked polyisocyanates based on a blocking agent and on a polyisocyanate containing at least two free NCO groups, if desired in the presence of a chain extender, in which the totally or partially blocked polyisocyanates are prepared by a solvent-free and continuous procedure. This reaction is carried out in a static mixer or inten- sive kneading apparatus or extruder. The invention furthermore relates to the use of the totally or partially blocked polyisocyanates for PUR powder coatings and solvent-containing, one-component PUR stoving enamels.

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