Preparation of hexamethylene 1,6-diisocyanate and/or isomeric di

Details Preparation of hexamethylene 1,6-diisocyanate and/or isomeric di Preparation of hexamethylene 1,6-diisocyanate and/or isomeric di

1985-07-15

1986-09-23

Siegel, Alan

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

Organic compounds

Isocyanate esters

C07C14100

Patent

active

046134662

ABSTRACT:
Hexamethylene 1,6-diisocyanate and/or isomeric aliphatic diisocyanates where alkylene is of 6 carbon atoms, preferably 2-methylpentamethylene 1,5-diisocyanate and/or 2-ethyltetramethylene 1,4-diisocyanate, are prepared by a process wherein the corresponding dialkylurethanes are vaporized, without decomposition, at from 220.degree. to 300.degree. C., advantageously under reduced pressure, the dialkylurethane vapors are subjected to thermal cleavage under reduced pressure, preferably from 0.1 to 200 mbar, and at above 300.degree. C., preferably from 310.degree. to 480.degree. C. The cleavage products are fractionally condensed with the product obtained in the first condensation stage consisting predominantly of the diisocyanates, while that obtained in the second condensation stage is the alcohol.

REFERENCES:
patent: 3734941 (1973-05-01), Sydor
patent: 4322365 (1982-03-01), Merger et al.
patent: 4388246 (1983-06-01), Sundermann

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