HIGH PERFORMANCE POLYURETHANE ELASTOMERS FROM MDI PREPOLYMERS WITH REDUCED CONTENT OF FREE MDI MONOMER

摘要

Polyurethane prepolymers having a reduced amount of unreacted monomericdiisocyanate, particularlydiphenyl-methane dissocyanate (MDI), prepared by distilling the prepolymerreaction product in the presence of a least one inert solventwhose boiling point is slightly below that of the monomeric diisocyanate; andto high performance cast polyurethane elastomersfrom the thus obtained prepolymers using diamine and/or diol chain extenders.