Mixture of di- and trimers of cycloaliphatic - diisocyanate

摘要

Starting monomeric diisocyanate, 3-isocyanatomethyl-3,5,5-trimethyl-cyclohexylisocyanate, is converted under catalytic influence of tert. phosphines to mixture consisting mainly of the dimer N,N'-bis-(1,3,3-trimethyl-5-isocyanatomethyl-cyclohexyl)-1,3-diaz- a-2,4-dioxocyclobutane.