Process for the production of polyisocyanates containing...

Details Process for the production of polyisocyanates containing... Process for the production of polyisocyanates containing...

C - Chemistry, Metallurgy

08

G

402/131

C08G 18/78 (2006.01) C07C 273/18 (2006.01) C07C 275/60 (2006.01)

Patent

CA 1334232

Aliphatic and/or cycloaliphatic polyisocyanates containing allophanate groups are produced by reacting (a) a di- and/or polyisocyanate with aliphatic and/or cycloaliphatic isocyanate groups with (b) a hydroxy compound at a temperature of at least 150°C for no more than 90 minutes and then rapidly cooling the reaction mixture to a temperature of less than 100°C. It is preferred that the reaction be carried out in, the absence of oxygen. The products thus obtained are virtually colorless, have a relatively low viscosity and excellent storage stability.

572020

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