C - Chemistry – Metallurgy – 07 – D
Patent
C - Chemistry, Metallurgy
07
D
402/182, 400/551
C07D 251/34 (2006.01) C08G 18/79 (2006.01) C09J 121/00 (2006.01) C09J 175/00 (2006.01)
Patent
CA 1080224
ABSTRACT OF THE INVENTION The instant invention is directed to a process for the production of isocyanate polyisocyanates containing at least 50%, by weight, of tris-isocyanatomonoisocyanurates and at most 3%, by weight, of isocyanurate-free diisocyanate. The process comprises catalytically trimerizing the organic diimocyanates free from isocyanurate groups and terminating the trimerization reaction by desactivation of the catalyst after 5 to 40% of the isocyanate groups of the isocyanurate-free diisocyanate have been trimerized. The unreacted isocyanurate- free diisocyanate is then distilled off in the presence of from 1 to 30%, by weight, based on the end product obtained as distillation residue, of an inert liquid distillation aid which boils at a temperature at least 50°C above the boiling point of the isocyanurate-free diisocyanate. The invention is also directed to the products produced by this process.
286761
Dollhausen Manfred
Hombach Rudolf
Muller Hans-Jurgen
Zirner Joachim
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