4,4-DIPHENYLMETHANE DIISOCYANATE(MDI) BASED POLYURETHANE PREPOLYMER HAVING LOW LEVEL OF MDI MONOMER

摘要

PURPOSE: Provided is a 4,4'-diphenylmethane diisocyanate(MDI) prepolymer low in free MDI monomer content which shows performance advantages over existing MDI prepolymer. CONSTITUTION: The MDI prepolymer composition is prepared by the reaction of 4,4'-diphenylmethane diisocyanate(MDI) with a polyol composition comprising a propylene oxide based polyether polyol. The composition consists essentially of at least 80 wt% perfect prepolymers and less than 2 wt% free MDI monomer. The 4,4'-diphenylmethane diisocyanate(MDI) comprises isomeric mixtures of MDI and/or polymeric MDI.