| 摘要 |
PROBLEM TO BE SOLVED: To provide a multistage method for continuously producing organic polyisocyanates, in particular diisocyanates.SOLUTION: In a multistage method for continuously producing organic diisocyanates or polyisocyanates, the corresponding diisocyanates or polyisocyanates are obtained by reacting corresponding first organic diamines or first organic polyamines with urea to give corresponding diureas or polyureas, and thermally decomposing the diureas or polyureas. |
