Polyisocyanates, preparation and use thereof

Details Polyisocyanates, preparation and use thereof Polyisocyanates, preparation and use thereof

C - Chemistry, Metallurgy

08

G

402/133, 402/159

C08G 18/78 (2006.01) C07C 275/62 (2006.01) C08G 18/80 (2006.01)

Patent

CA 1133004

ABSTRACT OF THE DISCLOSURE The present invention related to a process for the production of specific polyisocyanates by reacting di- amines containing hydrogen atoms which are active in the context of the isocyanate addition reaction with excess quantities of organic diisocyanates The invention also relates to a modification of the above process charac- terized in that the diamines are reacted first with excess quantities of a first diisocyanate after which the thus obtained reaction product which contains a urea group and a biuret group is reacted in a second stage with a second diisocyanate. The invention also related to the use of polyisocyanates as the isocyanate component in the production of polyurethane plastics by the isocyanate-polyaddition process.

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