| abstract |
The invention relates to a process for preparing a high-molecular polymer by contacting in a melt a difunctional lowermolecular polymer whose functional end groups are -OH or -NH2 groups with carbonylbislactamate, characterized in that the melt also contains an acid or a base as a catalyst. If the difunctional polymer contains a -COOH group, it is preferred for the melt also to contain a bisoxazine or a bisoxazoline. |