DIISOCYANATES, DIISOCYANATE MIXTURES AND A PROCESS FOR THEIR PRODUCTION

摘要

DIISOCYANATES, DIISOCYANATE MIXTURES AND A PROCESS FOR THEIR PRODUCTION Diisocyanates and isomeric mixtures of diisocyanates corresponding to the formula < IMG > in which Rl, R2, R3, m and n are as defined herein are made by phosgenating diamines corresponding to the formula < IMG > in which Rl, R2, R3, m and n are as defined herein at a temperature of from -20 to 250.degree.C. These diisocyanates are particularly useful as starting materials for the production of polyurethanes by the isocyanate polyaddition process.