Preparation of organic mono- and poly- isocyanates

Details Preparation of organic mono- and poly- isocyanates Preparation of organic mono- and poly- isocyanates

C - Chemistry, Metallurgy

07

D

260/386, 260/455

C07D 213/72 (2006.01) C07D 219/08 (2006.01)

Patent

CA 1116621

ABSTRACT Preparation of organic mono- and poly isocyanates" A process for the preparation of an organic mono-- or poly-isocyanate corresponding to the following general formula: R(NCO)n, wherein R represents an optionally substituted aliphatic, cycloaliphatic, aromatic or heterocyclic radical; and n represents an integer of from 1 to 3; which comprises thermally decomposing n hydrogen chloride adduct of a tri-substituted urea corresponding to the following general formula: R(NHCONR'R'')n wherein R' and R'' which may be the same or different, each represents an optionally substituted C1-C4 aliphatic hydrocarbon radical; the adduct containing at least the stoichiometric quantity and at most 10 mole percent of excess hydrogen chloride and thermal decomposition being carried out in the melt or in the presence of an inert organic solvent in a closed system at a temperature of from 80 to 180°C, is disclosed. Inter alia, the present process is distinguished from the known processes by high yields and short reaction times.

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