PROCESS FOR PREPARING POLYISOCYANATE

摘要

Polyisocyanate contg. oxadiazinetrion ring is prepd. by reacting a monomer or an adduct of bis(isocyanatemethyl)cyclohexane with carbon dioxide gas. Bis(isocyanatemethyl) cyclohexane is closen from 1,4-bis(isocisocyanatemethyl) cyclohexane or 1,3-bis(iso- cyanatemethyl) cyclohexane (any isomercis or trans, will do), or their mixt. An adduct to bis(isocyanatemethyl)cyclohexane is a reaction product of bis(isocyanatemethyl) cyclo- hexane and active hydrogen compound.