METHOD FOR THE PREPARATION OF ORGANIC ISOCYANATES

摘要

Method for the preparation of aromatic monomeric or polymeric isocyanates by decomposing aromatic monomeric or polymeric carbamates of the formula R1(NHCOOR2)x wherein x is at least 1, R1 is an aromatic radical of valency x and R2 is a monovalent organic radical, into aromatic monomeric or polymeric isocyanates of the formula R1(NCO)x and alcohols of the formula R2OH, characterised in that the radical R2 is substituted by a group containing at least one halogen group.