STABLE LIQUID BIURET MODIFIED AND BIURET ALLOPHANATE MODIFIED DIPHENYLMETHANE DIISOCYANATES, PREPOLYMERS THEREOF, AND PROCESSES FOR THEIR PREPARATION

摘要

This invention relates to stable liquid modified diphenylmethane diisocyanates which comprise a secondary amine based biuret modified diphenylmethane diisocyanate having an NCO group content of about 12 to about 30% by weight. The present invention also relates to stable liquid biuret allophanate modified MDIs, to stable liquid prepolymers of biuret modified MDIs, to stable liquid prepolymers of biuret allophanate modified MDIs, and to processes for the preparation of these compositions./SDOA B