Process for preparing (cyclo)aliphatic isocyanates

Details Process for preparing (cyclo)aliphatic isocyanates Process for preparing (cyclo)aliphatic isocyanates

2005-01-04

2005-01-04

Killos, Paul J. (Department: 1625)

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

Organic compounds

Isocyanate esters

Reexamination Certificate

active

06838578

ABSTRACT:
The present invention relates to a process for preparing (cyclo)aliphatic diisocyanates and triisocyanates corresponding to the formulain-line-formulae description="In-line Formulae" end="lead"?R—(NCO)n  (I),in-line-formulae description="In-line Formulae" end="tail"?whereinR represents a (cyclo)aliphatic hydrocarbon group having up to 15 carbon atoms, provided that there are at least two carbon atoms between two nitrogens,n represents the number 2 or 3,bya) separately heating phosgene and a diamine or triamine corresponding to the formulain-line-formulae description="In-line Formulae" end="lead"?R—(NH2)n  (II),in-line-formulae description="In-line Formulae" end="tail"? to a temperature of 200° C. to 600° C., wherein the amine may optionally be diluted with an inert gas or with the vapors of an inert solvent,b) optionally passing the reactants over torque-producing baffles andc) continuously reacting phosgene and the amine in the gas phase in a reaction chamber without moving parts and with constrictions of the walls in the region of the reaction zone.

REFERENCES:
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patent: 5633396 (1997-05-01), Bischof et al.
patent: 6225497 (2001-05-01), Becker et al.
patent: 0 676 393 (1995-10-01), None
patent: 407567 (1973-12-01), None

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