Diisocyanates, a process for their production and their use in the production of polyurethane plastics

摘要

alpha -(4-isocyanatophenoxy)- psi -(4-isocyanato-3-methyl-phenoxy)-alkanes and mixtures thereof with the corresponding methyl-free and/or dimethyl substituted diisocyanates are made by phosgenating the corresponding diamine(s). These diisocyanates do not form a precipitate when reacted with a polyol and produce polyurethanes having outstanding properties.