Process for the preparation of organic mono- and polyisocyanates

Details Process for the preparation of organic mono- and polyisocyanates Process for the preparation of organic mono- and polyisocyanates

1979-08-01

1980-09-16

Torrence, Dolph H.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

26053P, 546308, C07C11800

Patent

active

042231450

ABSTRACT:
A process for the preparation of organic mono- and polyisocyanates is described, in which a hydrogen chloride adduct of a trisubstituted urea is thermally decomposed to form the isocyanate. The hydrogen chloride adduct at minimum contains the stoichiometric amount of HCl, and at maximum a 10 mole-% excess. The process is carried out in a closed system at a temperature between about 80.degree. and 180.degree. C.; the reaction is effected either in a melt or in the presence of an inert organic solvent.

REFERENCES:
patent: 2773086 (1956-12-01), Slocombe et al.
patent: 3898259 (1975-08-01), Hearsey
patent: 3936484 (1976-02-01), Rosenthal et al.

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