MANUFACTURE OF PRIMARY ARALKYLURETHANES AND UREAS AND ISOCYANATES DERIVED THEREFORM

摘要

A process is disclosed for the preparation of aralkyl mono-and diurethanes or ureas by carbamylmethylation, or acid-catalyzed addition at a temperature of 40 DEG C to about 100 DEG C of formaldehyde and esters of carbamic acid to aromatic hydrocarbons. Aralkyl carbamates and ureas formed by this process can be cracked directly to produce aralkyl diisocyanates, or hydrogenated and then cracked to produce aliphatic diisocyanates, or reacted directly with polyols to produce polyurethanes by functioning as blocked isocyanates.