DIISOCYANATES OR MIXTURES OF DIISOCYANATES OF THE DIPHENYL-METHANE SERIES, PROCESS FOR THEIR PREPARATION AND THEIR USE AS A SYNTHESIS COMPONENT TO PRODUCE POLYURETHANE PLASTICS ACCORDING TO THE ISOCYANATE-POLYADDITION PROCESS

摘要

The instant invention is directed to diisocyanates based on diphenylmethane which may be methyl-substituted and which are characterized in particular by isocyanate groups in the 3,4'- and optionally in the 3,2'-position. The instant invention is also directed to a number of independent processes for their production and to their use as isocyanate component in the production of polyurethanes.