Process for producing blocked, urea group-containing...

Details Process for producing blocked, urea group-containing... Process for producing blocked, urea group-containing...

C - Chemistry, Metallurgy

07

C

260/278.1, 260/2

C07C 275/00 (2006.01) C07D 211/58 (2006.01) C07D 251/34 (2006.01) C08G 18/78 (2006.01) C08G 18/80 (2006.01)

Patent

CA 1331758

ABSTRACT OF THE DISCLOSURE A process for the production of a blocked urea group-containing polyisocyanate from a partially blocked polyisocyanate and a polyamine, comprising the steps of: (i) reacting a partially blocked polyisocyanate, said polyisocyanate being substantially free of monomeric polyisocyanate, with a primary polyamine, secondary polyamine, or mixtures thereof, in relative proportions such that the ratio of isocyanate groups to amino groups is in the range from about 1:1 to 1.3:1, and (ii) isolating said urea group-containing polyisocyanate by vacuum thin-layer evaporation, wherein the vacuum boiling point of said polyisocyanate is lower than the deblocking temperature of said urea group-containing polyisocyanate.

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