| 摘要 |
Method for the preparation of aromatic monomeric or polymeric isocyanates by decomposing aromatic monomeric or polymeric carbamates of the formula R<1>(NHCOOR<2>)x wherein x is at least 1, R<1> is an aromatic radical of valency x and R<2> is a monovalent organic radical, into aromatic monomeric or polymeric isocyanates of the formula R<1>(NCO)x and alcohols of the formula R<2>OH, characterised in that the radical R<2> is substituted by a group containing at least one halogen group. |
