C - Chemistry – Metallurgy – 07 – D
Patent
C - Chemistry, Metallurgy
07
D
C07D 403/14 (2006.01) C07D 231/12 (2006.01) C07D 251/34 (2006.01) C08G 18/08 (2006.01) C08G 18/80 (2006.01)
Patent
CA 2163169
The present invention relates to a process for preparing a blocked polyisocyanate which comprises reacting in a first reaction stage an equimolar mixture of acetylacetone and hydrazine hydrate via a condensation reaction in a water-immiscible solvent with separation and removal of the introduced and formed water to form a liquid organic product containing 3,5-dimethylpyrazole and in a second reaction stage reacting said liquid organic product, without separation of 3,5-dimethylpyrazole as a solid, with an organic polyisocyanate, which is optionally dissolved in a solvent, to at least partially block the isocyanate groups with 3,5-dimethylpyrazole.
Engbert Theodor
Konig Eberhard
Aktiengesellschaft Bayer
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
LandOfFree
A process for the production of polyisocyanates at least... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with A process for the production of polyisocyanates at least..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A process for the production of polyisocyanates at least... will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1422752