STABLE LIQUID, ALLOPHANATE-MODIFIED DIPHENYLMETHANE DIISOCYANATE TRIMERS, PREPOLYMERS THEREOF, AND PROCESSES FOR THEIR PREPARATION

摘要

The present invention relates to stable liquid, allophanate-modified,partially trimerized diphenylmethane diisocyanates, the prepolymers of thesestable liquid, allophanate-modified, partially trimerized MDI's, and toprocesses for the preparation of these compositions. These allophanatemodified partially trimerized diphenylmethane diisocyanates comprise thereaction product of a diphenylmethane diisocyanate and an organic compound inthe presence of a catalytic amount of one or more trimer catalysts, one ormore allophanate catalysts, one or more allophanate-trimer catalysts andmixtures thereof. The prepolymers are the reaction product of the stableliquid, allophanate-modified, partially trimerized MDI's with a suitableisocyanate-reactive group containing compound.