Process for preparing organic monoisocyanates

Details Process for preparing organic monoisocyanates Process for preparing organic monoisocyanates

C - Chemistry, Metallurgy

07

C

C07C 265/04 (2006.01) C07C 263/06 (2006.01) C07C 263/16 (2006.01)

Patent

CA 2345495

The present invention relates to a process for preparing a low boiling monoisocyanate having a boiling point of between 70 and 320°C at standard pressure by reacting A) a high boiling isocyanate compound having a boiling point of at least 180°C at standard pressure and an HC content of at least 50 ppm with B) a monoamine having a primary amino group, at a maximum reaction temperature of 180°C and a molar ratio of isocyanate groups to amino groups of at least 4:1 to form a compound containing a biuret/urea group, simultaneously thermally decomposing this compound in situ to form a monoisocyanate corresponding to monoamine B) and removing the monoisocyanate by distillation, optionally under vacuum.

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