Huels Aktiengesellschaft

Huls Aktiengesellschaft

Werner Huebel

Josef Disteldorf

Rainer Gras

Elmar Wolf

Horst Schnurbusch

Klaus Rindtorff

Karl Schmitz

Horst-Wolfram Borsdorff

Lothar Broschinski

Monoblocked diisocyanates which contain little free and diblocked diisocyanate are obtained by a process which involves adding 1 mole of a blocking agent to a diisocyanate which is present in excess and subsequently removing the excess diisocyanate by thin film evaporation. The compounds produced are useful for the production of cataphoresis resins.

Process for the production of monoblocked diisocyanates

A process for the preparation of a uretedione, comprising the steps of:

Process for the preparation of (cyclo)aliphatic uretediones

Cis-2,6-dimethylmorpholine is manufactured by catalytic isomerization of trans-2,6-dimethylmorpholine. A previously hydrogen-activated copper chromite catalyst is used for catalytic isomerization of the trans-2,6-dimethylmorpholine. The catalyst preferably also contains barium oxide and/or manganese dioxide. The process is carried out at 180.degree.-300.degree. C. and 1-500 bar absolute. The inexpensive novel catalyst enables conversions which are better than those with known methods.

Method of manufacturing cis-2,6-dimethylmorpholine

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Recklinghausen, Germany

Werner Huebel