Process for the preparation of an N-substituted carbamoyllactam 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: <CHEM> where: - R is a polyol originating from a polyol having the formula R-(OH)x1, where - x1 is an integer >/= 2 - R min is an alkyl, aralkyl, alkaryl or aryl group, whether or not cyclic, -y1 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.