Preparation of alkylene diisocyanates
AssigneeThe Dow Chemical Company
InventorsLaurence I. Peterson, Michael J. VanEyck
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Abstract
Alkylene diisocyanates of the formula OCN-R-NCO are prepared by heating a compound of the formula ##EQU1## at a temperature of about 200.degree. to about 500.degree. C. wherein --R-- is dimethylene, trimethylene or tetramethylene which may bear lower alkyl substituents. For example, ethylene diisocyanate is prepared by heating ethylene urea N,N'-dicarbonyl chloride at about 350.degree.C.
Claims9
A process for production of alkylene diisocyanates comprising heating, at a temperature sufficient to cause dephosgenation, a compound represented by the formula ##EQU6## wherein --R-- is dimethylene, trimethylene or tetramethylene which may bear from 1 to 8 lower alkyl groups of 1 to 3 carbon atoms each.
Dependencies are inferred from the claim text.