Process for the preparation of an N-substituted carbamoyl-lactam compound

摘要

The invention concerns a simple, reliable and reproducable process for the preparation of an N-substituted carbamoyl lactam compound, for example of the following formula: <IMAGE> where: R is a polyol originating from a polyol having the formula R-(OH)xi, where xi is an integer>/=2 R' is an alkyl, aralkyl, alkaryl or aryl group, whether or not cyclic, yi is an integer>/=0, (-L) is an unopened lactam ring and (-L-) is an opened lactam block. This process is characterized in that a polyol and a lactam blocked polyisocyanate are reacted in the liquid state in the presence of a metal compound catalyst.