Organic compounds -- part of the class 532-570 series – Organic compounds – Heterocyclic carbon compounds containing a hetero ring...
Patent
1998-01-08
1999-07-27
Davis, Zinna Northington
Organic compounds -- part of the class 532-570 series
Organic compounds
Heterocyclic carbon compounds containing a hetero ring...
5462764, 546304, C07D40104, C07D21302
Patent
active
059292415
ABSTRACT:
A process for the preparation of an isocyanurate-free uretdione of isophorphone diisocyanate, comprising dimerizing an isophorone diisocyanate of the general formula: ##STR1## in an inert organic solvent or in the absence of a solvent, with the aid of a catalysts, at a temperature of 0 to 80.degree. C.; isolating the uretdione formed from the reaction mixture after a conversion of 5-70%, without prior deactivation of the catalyst, by thin film distillation at 100-180.degree. C. under 0.01-0.5 mbar; wherein the isophorone diisocyanate has a purity of .gtoreq.99.9% by weight, and the concentration of the unknown first runnings component in a gas chromatogram of the isophorone diisocyanate employed for the dimerization is not greater than 0.05 area%; and wherein R.sup.1 and R.sup.2 are identical or different alkyl radicals having 1-8 C atoms, or with the N atom bonded to the ring, can form a common 5- or 6-membered ring which can contain a CH--CH.sub.3 group, an N--CH.sub.3 group or an O atom instead of a CH.sub.2 group.
Davis Zinna Northington
Huels Aktiengesellschaft
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