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US 4,060,536 AGranted
Method of preparing N,N'-bis-trimethylsilylurea
AssigneeDynamit Nobel Aktiengesellschaft
InventorsHans-Joachim Kotzsch, Hans-Joachim Vahlensieck
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Abstract
An improvement in a process for preparing N,N'-bis-trimethylsilylurea by reaction of urea with hexamethyldisilazane at an elevated temperature accompanied with ammonia evolution wherein the reaction is carried out in the presence of an acid catalyst.
Claims10
In a process for preparing N,N'-bis-trimethylsilylurea by contacting urea with hexamethyldisilazane at elevated temperature sufficient to evolve ammonia, the improvement which comprises carrying out the process in the presence of an acid catalyst, which acid catalyst is a Lewis acid or a hydrogen ion yielding acid.
Dependencies are inferred from the claim text.